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-rw-r--r--src/common/dpp.c7691
1 files changed, 7691 insertions, 0 deletions
diff --git a/src/common/dpp.c b/src/common/dpp.c
new file mode 100644
index 0000000000000..e715e0454d725
--- /dev/null
+++ b/src/common/dpp.c
@@ -0,0 +1,7691 @@
+/*
+ * DPP functionality shared between hostapd and wpa_supplicant
+ * Copyright (c) 2017, Qualcomm Atheros, Inc.
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "utils/includes.h"
+#include <openssl/opensslv.h>
+#include <openssl/err.h>
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+
+#include "utils/common.h"
+#include "utils/base64.h"
+#include "utils/json.h"
+#include "common/ieee802_11_common.h"
+#include "common/ieee802_11_defs.h"
+#include "common/wpa_ctrl.h"
+#include "crypto/crypto.h"
+#include "crypto/random.h"
+#include "crypto/aes.h"
+#include "crypto/aes_siv.h"
+#include "crypto/sha384.h"
+#include "crypto/sha512.h"
+#include "drivers/driver.h"
+#include "dpp.h"
+
+
+#ifdef CONFIG_TESTING_OPTIONS
+enum dpp_test_behavior dpp_test = DPP_TEST_DISABLED;
+u8 dpp_pkex_own_mac_override[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
+u8 dpp_pkex_peer_mac_override[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
+u8 dpp_pkex_ephemeral_key_override[600];
+size_t dpp_pkex_ephemeral_key_override_len = 0;
+u8 dpp_protocol_key_override[600];
+size_t dpp_protocol_key_override_len = 0;
+u8 dpp_nonce_override[DPP_MAX_NONCE_LEN];
+size_t dpp_nonce_override_len = 0;
+
+static int dpp_test_gen_invalid_key(struct wpabuf *msg,
+ const struct dpp_curve_params *curve);
+#endif /* CONFIG_TESTING_OPTIONS */
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || \
+ (defined(LIBRESSL_VERSION_NUMBER) && \
+ LIBRESSL_VERSION_NUMBER < 0x20700000L)
+/* Compatibility wrappers for older versions. */
+
+static int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
+{
+ sig->r = r;
+ sig->s = s;
+ return 1;
+}
+
+
+static void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr,
+ const BIGNUM **ps)
+{
+ if (pr)
+ *pr = sig->r;
+ if (ps)
+ *ps = sig->s;
+}
+
+#endif
+
+
+static const struct dpp_curve_params dpp_curves[] = {
+ /* The mandatory to support and the default NIST P-256 curve needs to
+ * be the first entry on this list. */
+ { "prime256v1", 32, 32, 16, 32, "P-256", 19, "ES256" },
+ { "secp384r1", 48, 48, 24, 48, "P-384", 20, "ES384" },
+ { "secp521r1", 64, 64, 32, 66, "P-521", 21, "ES512" },
+ { "brainpoolP256r1", 32, 32, 16, 32, "BP-256", 28, "BS256" },
+ { "brainpoolP384r1", 48, 48, 24, 48, "BP-384", 29, "BS384" },
+ { "brainpoolP512r1", 64, 64, 32, 64, "BP-512", 30, "BS512" },
+ { NULL, 0, 0, 0, 0, NULL, 0, NULL }
+};
+
+
+/* Role-specific elements for PKEX */
+
+/* NIST P-256 */
+static const u8 pkex_init_x_p256[32] = {
+ 0x56, 0x26, 0x12, 0xcf, 0x36, 0x48, 0xfe, 0x0b,
+ 0x07, 0x04, 0xbb, 0x12, 0x22, 0x50, 0xb2, 0x54,
+ 0xb1, 0x94, 0x64, 0x7e, 0x54, 0xce, 0x08, 0x07,
+ 0x2e, 0xec, 0xca, 0x74, 0x5b, 0x61, 0x2d, 0x25
+ };
+static const u8 pkex_init_y_p256[32] = {
+ 0x3e, 0x44, 0xc7, 0xc9, 0x8c, 0x1c, 0xa1, 0x0b,
+ 0x20, 0x09, 0x93, 0xb2, 0xfd, 0xe5, 0x69, 0xdc,
+ 0x75, 0xbc, 0xad, 0x33, 0xc1, 0xe7, 0xc6, 0x45,
+ 0x4d, 0x10, 0x1e, 0x6a, 0x3d, 0x84, 0x3c, 0xa4
+ };
+static const u8 pkex_resp_x_p256[32] = {
+ 0x1e, 0xa4, 0x8a, 0xb1, 0xa4, 0xe8, 0x42, 0x39,
+ 0xad, 0x73, 0x07, 0xf2, 0x34, 0xdf, 0x57, 0x4f,
+ 0xc0, 0x9d, 0x54, 0xbe, 0x36, 0x1b, 0x31, 0x0f,
+ 0x59, 0x91, 0x52, 0x33, 0xac, 0x19, 0x9d, 0x76
+};
+static const u8 pkex_resp_y_p256[32] = {
+ 0xd9, 0xfb, 0xf6, 0xb9, 0xf5, 0xfa, 0xdf, 0x19,
+ 0x58, 0xd8, 0x3e, 0xc9, 0x89, 0x7a, 0x35, 0xc1,
+ 0xbd, 0xe9, 0x0b, 0x77, 0x7a, 0xcb, 0x91, 0x2a,
+ 0xe8, 0x21, 0x3f, 0x47, 0x52, 0x02, 0x4d, 0x67
+};
+
+/* NIST P-384 */
+static const u8 pkex_init_x_p384[48] = {
+ 0x95, 0x3f, 0x42, 0x9e, 0x50, 0x7f, 0xf9, 0xaa,
+ 0xac, 0x1a, 0xf2, 0x85, 0x2e, 0x64, 0x91, 0x68,
+ 0x64, 0xc4, 0x3c, 0xb7, 0x5c, 0xf8, 0xc9, 0x53,
+ 0x6e, 0x58, 0x4c, 0x7f, 0xc4, 0x64, 0x61, 0xac,
+ 0x51, 0x8a, 0x6f, 0xfe, 0xab, 0x74, 0xe6, 0x12,
+ 0x81, 0xac, 0x38, 0x5d, 0x41, 0xe6, 0xb9, 0xa3
+};
+static const u8 pkex_init_y_p384[48] = {
+ 0x76, 0x2f, 0x68, 0x84, 0xa6, 0xb0, 0x59, 0x29,
+ 0x83, 0xa2, 0x6c, 0xa4, 0x6c, 0x3b, 0xf8, 0x56,
+ 0x76, 0x11, 0x2a, 0x32, 0x90, 0xbd, 0x07, 0xc7,
+ 0x37, 0x39, 0x9d, 0xdb, 0x96, 0xf3, 0x2b, 0xb6,
+ 0x27, 0xbb, 0x29, 0x3c, 0x17, 0x33, 0x9d, 0x94,
+ 0xc3, 0xda, 0xac, 0x46, 0xb0, 0x8e, 0x07, 0x18
+};
+static const u8 pkex_resp_x_p384[48] = {
+ 0xad, 0xbe, 0xd7, 0x1d, 0x3a, 0x71, 0x64, 0x98,
+ 0x5f, 0xb4, 0xd6, 0x4b, 0x50, 0xd0, 0x84, 0x97,
+ 0x4b, 0x7e, 0x57, 0x70, 0xd2, 0xd9, 0xf4, 0x92,
+ 0x2a, 0x3f, 0xce, 0x99, 0xc5, 0x77, 0x33, 0x44,
+ 0x14, 0x56, 0x92, 0xcb, 0xae, 0x46, 0x64, 0xdf,
+ 0xe0, 0xbb, 0xd7, 0xb1, 0x29, 0x20, 0x72, 0xdf
+};
+static const u8 pkex_resp_y_p384[48] = {
+ 0xab, 0xa7, 0xdf, 0x52, 0xaa, 0xe2, 0x35, 0x0c,
+ 0xe3, 0x75, 0x32, 0xe6, 0xbf, 0x06, 0xc8, 0x7c,
+ 0x38, 0x29, 0x4c, 0xec, 0x82, 0xac, 0xd7, 0xa3,
+ 0x09, 0xd2, 0x0e, 0x22, 0x5a, 0x74, 0x52, 0xa1,
+ 0x7e, 0x54, 0x4e, 0xfe, 0xc6, 0x29, 0x33, 0x63,
+ 0x15, 0xe1, 0x7b, 0xe3, 0x40, 0x1c, 0xca, 0x06
+};
+
+/* NIST P-521 */
+static const u8 pkex_init_x_p521[66] = {
+ 0x00, 0x16, 0x20, 0x45, 0x19, 0x50, 0x95, 0x23,
+ 0x0d, 0x24, 0xbe, 0x00, 0x87, 0xdc, 0xfa, 0xf0,
+ 0x58, 0x9a, 0x01, 0x60, 0x07, 0x7a, 0xca, 0x76,
+ 0x01, 0xab, 0x2d, 0x5a, 0x46, 0xcd, 0x2c, 0xb5,
+ 0x11, 0x9a, 0xff, 0xaa, 0x48, 0x04, 0x91, 0x38,
+ 0xcf, 0x86, 0xfc, 0xa4, 0xa5, 0x0f, 0x47, 0x01,
+ 0x80, 0x1b, 0x30, 0xa3, 0xae, 0xe8, 0x1c, 0x2e,
+ 0xea, 0xcc, 0xf0, 0x03, 0x9f, 0x77, 0x4c, 0x8d,
+ 0x97, 0x76
+};
+static const u8 pkex_init_y_p521[66] = {
+ 0x00, 0xb3, 0x8e, 0x02, 0xe4, 0x2a, 0x63, 0x59,
+ 0x12, 0xc6, 0x10, 0xba, 0x3a, 0xf9, 0x02, 0x99,
+ 0x3f, 0x14, 0xf0, 0x40, 0xde, 0x5c, 0xc9, 0x8b,
+ 0x02, 0x55, 0xfa, 0x91, 0xb1, 0xcc, 0x6a, 0xbd,
+ 0xe5, 0x62, 0xc0, 0xc5, 0xe3, 0xa1, 0x57, 0x9f,
+ 0x08, 0x1a, 0xa6, 0xe2, 0xf8, 0x55, 0x90, 0xbf,
+ 0xf5, 0xa6, 0xc3, 0xd8, 0x52, 0x1f, 0xb7, 0x02,
+ 0x2e, 0x7c, 0xc8, 0xb3, 0x20, 0x1e, 0x79, 0x8d,
+ 0x03, 0xa8
+};
+static const u8 pkex_resp_x_p521[66] = {
+ 0x00, 0x79, 0xe4, 0x4d, 0x6b, 0x5e, 0x12, 0x0a,
+ 0x18, 0x2c, 0xb3, 0x05, 0x77, 0x0f, 0xc3, 0x44,
+ 0x1a, 0xcd, 0x78, 0x46, 0x14, 0xee, 0x46, 0x3f,
+ 0xab, 0xc9, 0x59, 0x7c, 0x85, 0xa0, 0xc2, 0xfb,
+ 0x02, 0x32, 0x99, 0xde, 0x5d, 0xe1, 0x0d, 0x48,
+ 0x2d, 0x71, 0x7d, 0x8d, 0x3f, 0x61, 0x67, 0x9e,
+ 0x2b, 0x8b, 0x12, 0xde, 0x10, 0x21, 0x55, 0x0a,
+ 0x5b, 0x2d, 0xe8, 0x05, 0x09, 0xf6, 0x20, 0x97,
+ 0x84, 0xb4
+};
+static const u8 pkex_resp_y_p521[66] = {
+ 0x00, 0x46, 0x63, 0x39, 0xbe, 0xcd, 0xa4, 0x2d,
+ 0xca, 0x27, 0x74, 0xd4, 0x1b, 0x91, 0x33, 0x20,
+ 0x83, 0xc7, 0x3b, 0xa4, 0x09, 0x8b, 0x8e, 0xa3,
+ 0x88, 0xe9, 0x75, 0x7f, 0x56, 0x7b, 0x38, 0x84,
+ 0x62, 0x02, 0x7c, 0x90, 0x51, 0x07, 0xdb, 0xe9,
+ 0xd0, 0xde, 0xda, 0x9a, 0x5d, 0xe5, 0x94, 0xd2,
+ 0xcf, 0x9d, 0x4c, 0x33, 0x91, 0xa6, 0xc3, 0x80,
+ 0xa7, 0x6e, 0x7e, 0x8d, 0xf8, 0x73, 0x6e, 0x53,
+ 0xce, 0xe1
+};
+
+/* Brainpool P-256r1 */
+static const u8 pkex_init_x_bp_p256r1[32] = {
+ 0x46, 0x98, 0x18, 0x6c, 0x27, 0xcd, 0x4b, 0x10,
+ 0x7d, 0x55, 0xa3, 0xdd, 0x89, 0x1f, 0x9f, 0xca,
+ 0xc7, 0x42, 0x5b, 0x8a, 0x23, 0xed, 0xf8, 0x75,
+ 0xac, 0xc7, 0xe9, 0x8d, 0xc2, 0x6f, 0xec, 0xd8
+};
+static const u8 pkex_init_y_bp_p256r1[32] = {
+ 0x93, 0xca, 0xef, 0xa9, 0x66, 0x3e, 0x87, 0xcd,
+ 0x52, 0x6e, 0x54, 0x13, 0xef, 0x31, 0x67, 0x30,
+ 0x15, 0x13, 0x9d, 0x6d, 0xc0, 0x95, 0x32, 0xbe,
+ 0x4f, 0xab, 0x5d, 0xf7, 0xbf, 0x5e, 0xaa, 0x0b
+};
+static const u8 pkex_resp_x_bp_p256r1[32] = {
+ 0x90, 0x18, 0x84, 0xc9, 0xdc, 0xcc, 0xb5, 0x2f,
+ 0x4a, 0x3f, 0x4f, 0x18, 0x0a, 0x22, 0x56, 0x6a,
+ 0xa9, 0xef, 0xd4, 0xe6, 0xc3, 0x53, 0xc2, 0x1a,
+ 0x23, 0x54, 0xdd, 0x08, 0x7e, 0x10, 0xd8, 0xe3
+};
+static const u8 pkex_resp_y_bp_p256r1[32] = {
+ 0x2a, 0xfa, 0x98, 0x9b, 0xe3, 0xda, 0x30, 0xfd,
+ 0x32, 0x28, 0xcb, 0x66, 0xfb, 0x40, 0x7f, 0xf2,
+ 0xb2, 0x25, 0x80, 0x82, 0x44, 0x85, 0x13, 0x7e,
+ 0x4b, 0xb5, 0x06, 0xc0, 0x03, 0x69, 0x23, 0x64
+};
+
+/* Brainpool P-384r1 */
+static const u8 pkex_init_x_bp_p384r1[48] = {
+ 0x0a, 0x2c, 0xeb, 0x49, 0x5e, 0xb7, 0x23, 0xbd,
+ 0x20, 0x5b, 0xe0, 0x49, 0xdf, 0xcf, 0xcf, 0x19,
+ 0x37, 0x36, 0xe1, 0x2f, 0x59, 0xdb, 0x07, 0x06,
+ 0xb5, 0xeb, 0x2d, 0xae, 0xc2, 0xb2, 0x38, 0x62,
+ 0xa6, 0x73, 0x09, 0xa0, 0x6c, 0x0a, 0xa2, 0x30,
+ 0x99, 0xeb, 0xf7, 0x1e, 0x47, 0xb9, 0x5e, 0xbe
+};
+static const u8 pkex_init_y_bp_p384r1[48] = {
+ 0x54, 0x76, 0x61, 0x65, 0x75, 0x5a, 0x2f, 0x99,
+ 0x39, 0x73, 0xca, 0x6c, 0xf9, 0xf7, 0x12, 0x86,
+ 0x54, 0xd5, 0xd4, 0xad, 0x45, 0x7b, 0xbf, 0x32,
+ 0xee, 0x62, 0x8b, 0x9f, 0x52, 0xe8, 0xa0, 0xc9,
+ 0xb7, 0x9d, 0xd1, 0x09, 0xb4, 0x79, 0x1c, 0x3e,
+ 0x1a, 0xbf, 0x21, 0x45, 0x66, 0x6b, 0x02, 0x52
+};
+static const u8 pkex_resp_x_bp_p384r1[48] = {
+ 0x03, 0xa2, 0x57, 0xef, 0xe8, 0x51, 0x21, 0xa0,
+ 0xc8, 0x9e, 0x21, 0x02, 0xb5, 0x9a, 0x36, 0x25,
+ 0x74, 0x22, 0xd1, 0xf2, 0x1b, 0xa8, 0x9a, 0x9b,
+ 0x97, 0xbc, 0x5a, 0xeb, 0x26, 0x15, 0x09, 0x71,
+ 0x77, 0x59, 0xec, 0x8b, 0xb7, 0xe1, 0xe8, 0xce,
+ 0x65, 0xb8, 0xaf, 0xf8, 0x80, 0xae, 0x74, 0x6c
+};
+static const u8 pkex_resp_y_bp_p384r1[48] = {
+ 0x2f, 0xd9, 0x6a, 0xc7, 0x3e, 0xec, 0x76, 0x65,
+ 0x2d, 0x38, 0x7f, 0xec, 0x63, 0x26, 0x3f, 0x04,
+ 0xd8, 0x4e, 0xff, 0xe1, 0x0a, 0x51, 0x74, 0x70,
+ 0xe5, 0x46, 0x63, 0x7f, 0x5c, 0xc0, 0xd1, 0x7c,
+ 0xfb, 0x2f, 0xea, 0xe2, 0xd8, 0x0f, 0x84, 0xcb,
+ 0xe9, 0x39, 0x5c, 0x64, 0xfe, 0xcb, 0x2f, 0xf1
+};
+
+/* Brainpool P-512r1 */
+static const u8 pkex_init_x_bp_p512r1[64] = {
+ 0x4c, 0xe9, 0xb6, 0x1c, 0xe2, 0x00, 0x3c, 0x9c,
+ 0xa9, 0xc8, 0x56, 0x52, 0xaf, 0x87, 0x3e, 0x51,
+ 0x9c, 0xbb, 0x15, 0x31, 0x1e, 0xc1, 0x05, 0xfc,
+ 0x7c, 0x77, 0xd7, 0x37, 0x61, 0x27, 0xd0, 0x95,
+ 0x98, 0xee, 0x5d, 0xa4, 0x3d, 0x09, 0xdb, 0x3d,
+ 0xfa, 0x89, 0x9e, 0x7f, 0xa6, 0xa6, 0x9c, 0xff,
+ 0x83, 0x5c, 0x21, 0x6c, 0x3e, 0xf2, 0xfe, 0xdc,
+ 0x63, 0xe4, 0xd1, 0x0e, 0x75, 0x45, 0x69, 0x0f
+};
+static const u8 pkex_init_y_bp_p512r1[64] = {
+ 0x50, 0xb5, 0x9b, 0xfa, 0x45, 0x67, 0x75, 0x94,
+ 0x44, 0xe7, 0x68, 0xb0, 0xeb, 0x3e, 0xb3, 0xb8,
+ 0xf9, 0x99, 0x05, 0xef, 0xae, 0x6c, 0xbc, 0xe3,
+ 0xe1, 0xd2, 0x51, 0x54, 0xdf, 0x59, 0xd4, 0x45,
+ 0x41, 0x3a, 0xa8, 0x0b, 0x76, 0x32, 0x44, 0x0e,
+ 0x07, 0x60, 0x3a, 0x6e, 0xbe, 0xfe, 0xe0, 0x58,
+ 0x52, 0xa0, 0xaa, 0x8b, 0xd8, 0x5b, 0xf2, 0x71,
+ 0x11, 0x9a, 0x9e, 0x8f, 0x1a, 0xd1, 0xc9, 0x99
+};
+static const u8 pkex_resp_x_bp_p512r1[64] = {
+ 0x2a, 0x60, 0x32, 0x27, 0xa1, 0xe6, 0x94, 0x72,
+ 0x1c, 0x48, 0xbe, 0xc5, 0x77, 0x14, 0x30, 0x76,
+ 0xe4, 0xbf, 0xf7, 0x7b, 0xc5, 0xfd, 0xdf, 0x19,
+ 0x1e, 0x0f, 0xdf, 0x1c, 0x40, 0xfa, 0x34, 0x9e,
+ 0x1f, 0x42, 0x24, 0xa3, 0x2c, 0xd5, 0xc7, 0xc9,
+ 0x7b, 0x47, 0x78, 0x96, 0xf1, 0x37, 0x0e, 0x88,
+ 0xcb, 0xa6, 0x52, 0x29, 0xd7, 0xa8, 0x38, 0x29,
+ 0x8e, 0x6e, 0x23, 0x47, 0xd4, 0x4b, 0x70, 0x3e
+};
+static const u8 pkex_resp_y_bp_p512r1[64] = {
+ 0x80, 0x1f, 0x43, 0xd2, 0x17, 0x35, 0xec, 0x81,
+ 0xd9, 0x4b, 0xdc, 0x81, 0x19, 0xd9, 0x5f, 0x68,
+ 0x16, 0x84, 0xfe, 0x63, 0x4b, 0x8d, 0x5d, 0xaa,
+ 0x88, 0x4a, 0x47, 0x48, 0xd4, 0xea, 0xab, 0x7d,
+ 0x6a, 0xbf, 0xe1, 0x28, 0x99, 0x6a, 0x87, 0x1c,
+ 0x30, 0xb4, 0x44, 0x2d, 0x75, 0xac, 0x35, 0x09,
+ 0x73, 0x24, 0x3d, 0xb4, 0x43, 0xb1, 0xc1, 0x56,
+ 0x56, 0xad, 0x30, 0x87, 0xf4, 0xc3, 0x00, 0xc7
+};
+
+
+static void dpp_debug_print_point(const char *title, const EC_GROUP *group,
+ const EC_POINT *point)
+{
+ BIGNUM *x, *y;
+ BN_CTX *ctx;
+ char *x_str = NULL, *y_str = NULL;
+
+ if (!wpa_debug_show_keys)
+ return;
+
+ ctx = BN_CTX_new();
+ x = BN_new();
+ y = BN_new();
+ if (!ctx || !x || !y ||
+ EC_POINT_get_affine_coordinates_GFp(group, point, x, y, ctx) != 1)
+ goto fail;
+
+ x_str = BN_bn2hex(x);
+ y_str = BN_bn2hex(y);
+ if (!x_str || !y_str)
+ goto fail;
+
+ wpa_printf(MSG_DEBUG, "%s (%s,%s)", title, x_str, y_str);
+
+fail:
+ OPENSSL_free(x_str);
+ OPENSSL_free(y_str);
+ BN_free(x);
+ BN_free(y);
+ BN_CTX_free(ctx);
+}
+
+
+static int dpp_hash_vector(const struct dpp_curve_params *curve,
+ size_t num_elem, const u8 *addr[], const size_t *len,
+ u8 *mac)
+{
+ if (curve->hash_len == 32)
+ return sha256_vector(num_elem, addr, len, mac);
+ if (curve->hash_len == 48)
+ return sha384_vector(num_elem, addr, len, mac);
+ if (curve->hash_len == 64)
+ return sha512_vector(num_elem, addr, len, mac);
+ return -1;
+}
+
+
+static int dpp_hkdf_expand(size_t hash_len, const u8 *secret, size_t secret_len,
+ const char *label, u8 *out, size_t outlen)
+{
+ if (hash_len == 32)
+ return hmac_sha256_kdf(secret, secret_len, NULL,
+ (const u8 *) label, os_strlen(label),
+ out, outlen);
+ if (hash_len == 48)
+ return hmac_sha384_kdf(secret, secret_len, NULL,
+ (const u8 *) label, os_strlen(label),
+ out, outlen);
+ if (hash_len == 64)
+ return hmac_sha512_kdf(secret, secret_len, NULL,
+ (const u8 *) label, os_strlen(label),
+ out, outlen);
+ return -1;
+}
+
+
+static int dpp_hmac_vector(size_t hash_len, const u8 *key, size_t key_len,
+ size_t num_elem, const u8 *addr[],
+ const size_t *len, u8 *mac)
+{
+ if (hash_len == 32)
+ return hmac_sha256_vector(key, key_len, num_elem, addr, len,
+ mac);
+ if (hash_len == 48)
+ return hmac_sha384_vector(key, key_len, num_elem, addr, len,
+ mac);
+ if (hash_len == 64)
+ return hmac_sha512_vector(key, key_len, num_elem, addr, len,
+ mac);
+ return -1;
+}
+
+
+static int dpp_hmac(size_t hash_len, const u8 *key, size_t key_len,
+ const u8 *data, size_t data_len, u8 *mac)
+{
+ if (hash_len == 32)
+ return hmac_sha256(key, key_len, data, data_len, mac);
+ if (hash_len == 48)
+ return hmac_sha384(key, key_len, data, data_len, mac);
+ if (hash_len == 64)
+ return hmac_sha512(key, key_len, data, data_len, mac);
+ return -1;
+}
+
+
+static int dpp_bn2bin_pad(const BIGNUM *bn, u8 *pos, size_t len)
+{
+ int num_bytes, offset;
+
+ num_bytes = BN_num_bytes(bn);
+ if ((size_t) num_bytes > len)
+ return -1;
+ offset = len - num_bytes;
+ os_memset(pos, 0, offset);
+ BN_bn2bin(bn, pos + offset);
+ return 0;
+}
+
+
+static struct wpabuf * dpp_get_pubkey_point(EVP_PKEY *pkey, int prefix)
+{
+ int len, res;
+ EC_KEY *eckey;
+ struct wpabuf *buf;
+ unsigned char *pos;
+
+ eckey = EVP_PKEY_get1_EC_KEY(pkey);
+ if (!eckey)
+ return NULL;
+ EC_KEY_set_conv_form(eckey, POINT_CONVERSION_UNCOMPRESSED);
+ len = i2o_ECPublicKey(eckey, NULL);
+ if (len <= 0) {
+ wpa_printf(MSG_ERROR,
+ "DDP: Failed to determine public key encoding length");
+ EC_KEY_free(eckey);
+ return NULL;
+ }
+
+ buf = wpabuf_alloc(len);
+ if (!buf) {
+ EC_KEY_free(eckey);
+ return NULL;
+ }
+
+ pos = wpabuf_put(buf, len);
+ res = i2o_ECPublicKey(eckey, &pos);
+ EC_KEY_free(eckey);
+ if (res != len) {
+ wpa_printf(MSG_ERROR,
+ "DDP: Failed to encode public key (res=%d/%d)",
+ res, len);
+ wpabuf_free(buf);
+ return NULL;
+ }
+
+ if (!prefix) {
+ /* Remove 0x04 prefix to match DPP definition */
+ pos = wpabuf_mhead(buf);
+ os_memmove(pos, pos + 1, len - 1);
+ buf->used--;
+ }
+
+ return buf;
+}
+
+
+static EVP_PKEY * dpp_set_pubkey_point_group(const EC_GROUP *group,
+ const u8 *buf_x, const u8 *buf_y,
+ size_t len)
+{
+ EC_KEY *eckey = NULL;
+ BN_CTX *ctx;
+ EC_POINT *point = NULL;
+ BIGNUM *x = NULL, *y = NULL;
+ EVP_PKEY *pkey = NULL;
+
+ ctx = BN_CTX_new();
+ if (!ctx) {
+ wpa_printf(MSG_ERROR, "DPP: Out of memory");
+ return NULL;
+ }
+
+ point = EC_POINT_new(group);
+ x = BN_bin2bn(buf_x, len, NULL);
+ y = BN_bin2bn(buf_y, len, NULL);
+ if (!point || !x || !y) {
+ wpa_printf(MSG_ERROR, "DPP: Out of memory");
+ goto fail;
+ }
+
+ if (!EC_POINT_set_affine_coordinates_GFp(group, point, x, y, ctx)) {
+ wpa_printf(MSG_ERROR,
+ "DPP: OpenSSL: EC_POINT_set_affine_coordinates_GFp failed: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+
+ if (!EC_POINT_is_on_curve(group, point, ctx) ||
+ EC_POINT_is_at_infinity(group, point)) {
+ wpa_printf(MSG_ERROR, "DPP: Invalid point");
+ goto fail;
+ }
+ dpp_debug_print_point("DPP: dpp_set_pubkey_point_group", group, point);
+
+ eckey = EC_KEY_new();
+ if (!eckey ||
+ EC_KEY_set_group(eckey, group) != 1 ||
+ EC_KEY_set_public_key(eckey, point) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to set EC_KEY: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+ EC_KEY_set_asn1_flag(eckey, OPENSSL_EC_NAMED_CURVE);
+
+ pkey = EVP_PKEY_new();
+ if (!pkey || EVP_PKEY_set1_EC_KEY(pkey, eckey) != 1) {
+ wpa_printf(MSG_ERROR, "DPP: Could not create EVP_PKEY");
+ goto fail;
+ }
+
+out:
+ BN_free(x);
+ BN_free(y);
+ EC_KEY_free(eckey);
+ EC_POINT_free(point);
+ BN_CTX_free(ctx);
+ return pkey;
+fail:
+ EVP_PKEY_free(pkey);
+ pkey = NULL;
+ goto out;
+}
+
+
+static EVP_PKEY * dpp_set_pubkey_point(EVP_PKEY *group_key,
+ const u8 *buf, size_t len)
+{
+ EC_KEY *eckey;
+ const EC_GROUP *group;
+ EVP_PKEY *pkey = NULL;
+
+ if (len & 1)
+ return NULL;
+
+ eckey = EVP_PKEY_get1_EC_KEY(group_key);
+ if (!eckey) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Could not get EC_KEY from group_key");
+ return NULL;
+ }
+
+ group = EC_KEY_get0_group(eckey);
+ if (group)
+ pkey = dpp_set_pubkey_point_group(group, buf, buf + len / 2,
+ len / 2);
+ else
+ wpa_printf(MSG_ERROR, "DPP: Could not get EC group");
+
+ EC_KEY_free(eckey);
+ return pkey;
+}
+
+
+static void dpp_auth_fail(struct dpp_authentication *auth, const char *txt)
+{
+ wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_FAIL "%s", txt);
+}
+
+
+struct wpabuf * dpp_alloc_msg(enum dpp_public_action_frame_type type,
+ size_t len)
+{
+ struct wpabuf *msg;
+
+ msg = wpabuf_alloc(8 + len);
+ if (!msg)
+ return NULL;
+ wpabuf_put_u8(msg, WLAN_ACTION_PUBLIC);
+ wpabuf_put_u8(msg, WLAN_PA_VENDOR_SPECIFIC);
+ wpabuf_put_be24(msg, OUI_WFA);
+ wpabuf_put_u8(msg, DPP_OUI_TYPE);
+ wpabuf_put_u8(msg, 1); /* Crypto Suite */
+ wpabuf_put_u8(msg, type);
+ return msg;
+}
+
+
+const u8 * dpp_get_attr(const u8 *buf, size_t len, u16 req_id, u16 *ret_len)
+{
+ u16 id, alen;
+ const u8 *pos = buf, *end = buf + len;
+
+ while (end - pos >= 4) {
+ id = WPA_GET_LE16(pos);
+ pos += 2;
+ alen = WPA_GET_LE16(pos);
+ pos += 2;
+ if (alen > end - pos)
+ return NULL;
+ if (id == req_id) {
+ *ret_len = alen;
+ return pos;
+ }
+ pos += alen;
+ }
+
+ return NULL;
+}
+
+
+int dpp_check_attrs(const u8 *buf, size_t len)
+{
+ const u8 *pos, *end;
+ int wrapped_data = 0;
+
+ pos = buf;
+ end = buf + len;
+ while (end - pos >= 4) {
+ u16 id, alen;
+
+ id = WPA_GET_LE16(pos);
+ pos += 2;
+ alen = WPA_GET_LE16(pos);
+ pos += 2;
+ wpa_printf(MSG_MSGDUMP, "DPP: Attribute ID %04x len %u",
+ id, alen);
+ if (alen > end - pos) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Truncated message - not enough room for the attribute - dropped");
+ return -1;
+ }
+ if (wrapped_data) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: An unexpected attribute included after the Wrapped Data attribute");
+ return -1;
+ }
+ if (id == DPP_ATTR_WRAPPED_DATA)
+ wrapped_data = 1;
+ pos += alen;
+ }
+
+ if (end != pos) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unexpected octets (%d) after the last attribute",
+ (int) (end - pos));
+ return -1;
+ }
+
+ return 0;
+}
+
+
+void dpp_bootstrap_info_free(struct dpp_bootstrap_info *info)
+{
+ if (!info)
+ return;
+ os_free(info->uri);
+ os_free(info->info);
+ EVP_PKEY_free(info->pubkey);
+ os_free(info);
+}
+
+
+const char * dpp_bootstrap_type_txt(enum dpp_bootstrap_type type)
+{
+ switch (type) {
+ case DPP_BOOTSTRAP_QR_CODE:
+ return "QRCODE";
+ case DPP_BOOTSTRAP_PKEX:
+ return "PKEX";
+ }
+ return "??";
+}
+
+
+static int dpp_uri_valid_info(const char *info)
+{
+ while (*info) {
+ unsigned char val = *info++;
+
+ if (val < 0x20 || val > 0x7e || val == 0x3b)
+ return 0;
+ }
+
+ return 1;
+}
+
+
+static int dpp_clone_uri(struct dpp_bootstrap_info *bi, const char *uri)
+{
+ bi->uri = os_strdup(uri);
+ return bi->uri ? 0 : -1;
+}
+
+
+int dpp_parse_uri_chan_list(struct dpp_bootstrap_info *bi,
+ const char *chan_list)
+{
+ const char *pos = chan_list;
+ int opclass, channel, freq;
+
+ while (pos && *pos && *pos != ';') {
+ opclass = atoi(pos);
+ if (opclass <= 0)
+ goto fail;
+ pos = os_strchr(pos, '/');
+ if (!pos)
+ goto fail;
+ pos++;
+ channel = atoi(pos);
+ if (channel <= 0)
+ goto fail;
+ while (*pos >= '0' && *pos <= '9')
+ pos++;
+ freq = ieee80211_chan_to_freq(NULL, opclass, channel);
+ wpa_printf(MSG_DEBUG,
+ "DPP: URI channel-list: opclass=%d channel=%d ==> freq=%d",
+ opclass, channel, freq);
+ if (freq < 0) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Ignore unknown URI channel-list channel (opclass=%d channel=%d)",
+ opclass, channel);
+ } else if (bi->num_freq == DPP_BOOTSTRAP_MAX_FREQ) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Too many channels in URI channel-list - ignore list");
+ bi->num_freq = 0;
+ break;
+ } else {
+ bi->freq[bi->num_freq++] = freq;
+ }
+
+ if (*pos == ';' || *pos == '\0')
+ break;
+ if (*pos != ',')
+ goto fail;
+ pos++;
+ }
+
+ return 0;
+fail:
+ wpa_printf(MSG_DEBUG, "DPP: Invalid URI channel-list");
+ return -1;
+}
+
+
+int dpp_parse_uri_mac(struct dpp_bootstrap_info *bi, const char *mac)
+{
+ if (!mac)
+ return 0;
+
+ if (hwaddr_aton2(mac, bi->mac_addr) < 0) {
+ wpa_printf(MSG_DEBUG, "DPP: Invalid URI mac");
+ return -1;
+ }
+
+ wpa_printf(MSG_DEBUG, "DPP: URI mac: " MACSTR, MAC2STR(bi->mac_addr));
+
+ return 0;
+}
+
+
+int dpp_parse_uri_info(struct dpp_bootstrap_info *bi, const char *info)
+{
+ const char *end;
+
+ if (!info)
+ return 0;
+
+ end = os_strchr(info, ';');
+ if (!end)
+ end = info + os_strlen(info);
+ bi->info = os_malloc(end - info + 1);
+ if (!bi->info)
+ return -1;
+ os_memcpy(bi->info, info, end - info);
+ bi->info[end - info] = '\0';
+ wpa_printf(MSG_DEBUG, "DPP: URI(information): %s", bi->info);
+ if (!dpp_uri_valid_info(bi->info)) {
+ wpa_printf(MSG_DEBUG, "DPP: Invalid URI information payload");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static const struct dpp_curve_params *
+dpp_get_curve_oid(const ASN1_OBJECT *poid)
+{
+ ASN1_OBJECT *oid;
+ int i;
+
+ for (i = 0; dpp_curves[i].name; i++) {
+ oid = OBJ_txt2obj(dpp_curves[i].name, 0);
+ if (oid && OBJ_cmp(poid, oid) == 0)
+ return &dpp_curves[i];
+ }
+ return NULL;
+}
+
+
+static const struct dpp_curve_params * dpp_get_curve_nid(int nid)
+{
+ int i, tmp;
+
+ if (!nid)
+ return NULL;
+ for (i = 0; dpp_curves[i].name; i++) {
+ tmp = OBJ_txt2nid(dpp_curves[i].name);
+ if (tmp == nid)
+ return &dpp_curves[i];
+ }
+ return NULL;
+}
+
+
+static int dpp_parse_uri_pk(struct dpp_bootstrap_info *bi, const char *info)
+{
+ const char *end;
+ u8 *data;
+ size_t data_len;
+ EVP_PKEY *pkey;
+ const unsigned char *p;
+ int res;
+ X509_PUBKEY *pub = NULL;
+ ASN1_OBJECT *ppkalg;
+ const unsigned char *pk;
+ int ppklen;
+ X509_ALGOR *pa;
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
+ ASN1_OBJECT *pa_oid;
+#else
+ const ASN1_OBJECT *pa_oid;
+#endif
+ const void *pval;
+ int ptype;
+ const ASN1_OBJECT *poid;
+ char buf[100];
+
+ end = os_strchr(info, ';');
+ if (!end)
+ return -1;
+
+ data = base64_decode((const unsigned char *) info, end - info,
+ &data_len);
+ if (!data) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Invalid base64 encoding on URI public-key");
+ return -1;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: Base64 decoded URI public-key",
+ data, data_len);
+
+ if (sha256_vector(1, (const u8 **) &data, &data_len,
+ bi->pubkey_hash) < 0) {
+ wpa_printf(MSG_DEBUG, "DPP: Failed to hash public key");
+ os_free(data);
+ return -1;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: Public key hash",
+ bi->pubkey_hash, SHA256_MAC_LEN);
+
+ /* DER encoded ASN.1 SubjectPublicKeyInfo
+ *
+ * SubjectPublicKeyInfo ::= SEQUENCE {
+ * algorithm AlgorithmIdentifier,
+ * subjectPublicKey BIT STRING }
+ *
+ * AlgorithmIdentifier ::= SEQUENCE {
+ * algorithm OBJECT IDENTIFIER,
+ * parameters ANY DEFINED BY algorithm OPTIONAL }
+ *
+ * subjectPublicKey = compressed format public key per ANSI X9.63
+ * algorithm = ecPublicKey (1.2.840.10045.2.1)
+ * parameters = shall be present and shall be OBJECT IDENTIFIER; e.g.,
+ * prime256v1 (1.2.840.10045.3.1.7)
+ */
+
+ p = data;
+ pkey = d2i_PUBKEY(NULL, &p, data_len);
+ os_free(data);
+
+ if (!pkey) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Could not parse URI public-key SubjectPublicKeyInfo");
+ return -1;
+ }
+
+ if (EVP_PKEY_type(EVP_PKEY_id(pkey)) != EVP_PKEY_EC) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: SubjectPublicKeyInfo does not describe an EC key");
+ EVP_PKEY_free(pkey);
+ return -1;
+ }
+
+ res = X509_PUBKEY_set(&pub, pkey);
+ if (res != 1) {
+ wpa_printf(MSG_DEBUG, "DPP: Could not set pubkey");
+ goto fail;
+ }
+
+ res = X509_PUBKEY_get0_param(&ppkalg, &pk, &ppklen, &pa, pub);
+ if (res != 1) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Could not extract SubjectPublicKeyInfo parameters");
+ goto fail;
+ }
+ res = OBJ_obj2txt(buf, sizeof(buf), ppkalg, 0);
+ if (res < 0 || (size_t) res >= sizeof(buf)) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Could not extract SubjectPublicKeyInfo algorithm");
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: URI subjectPublicKey algorithm: %s", buf);
+ if (os_strcmp(buf, "id-ecPublicKey") != 0) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unsupported SubjectPublicKeyInfo algorithm");
+ goto fail;
+ }
+
+ X509_ALGOR_get0(&pa_oid, &ptype, (void *) &pval, pa);
+ if (ptype != V_ASN1_OBJECT) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: SubjectPublicKeyInfo parameters did not contain an OID");
+ goto fail;
+ }
+ poid = pval;
+ res = OBJ_obj2txt(buf, sizeof(buf), poid, 0);
+ if (res < 0 || (size_t) res >= sizeof(buf)) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Could not extract SubjectPublicKeyInfo parameters OID");
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: URI subjectPublicKey parameters: %s", buf);
+ bi->curve = dpp_get_curve_oid(poid);
+ if (!bi->curve) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unsupported SubjectPublicKeyInfo curve: %s",
+ buf);
+ goto fail;
+ }
+
+ wpa_hexdump(MSG_DEBUG, "DPP: URI subjectPublicKey", pk, ppklen);
+
+ X509_PUBKEY_free(pub);
+ bi->pubkey = pkey;
+ return 0;
+fail:
+ X509_PUBKEY_free(pub);
+ EVP_PKEY_free(pkey);
+ return -1;
+}
+
+
+static struct dpp_bootstrap_info * dpp_parse_uri(const char *uri)
+{
+ const char *pos = uri;
+ const char *end;
+ const char *chan_list = NULL, *mac = NULL, *info = NULL, *pk = NULL;
+ struct dpp_bootstrap_info *bi;
+
+ wpa_hexdump_ascii(MSG_DEBUG, "DPP: URI", uri, os_strlen(uri));
+
+ if (os_strncmp(pos, "DPP:", 4) != 0) {
+ wpa_printf(MSG_INFO, "DPP: Not a DPP URI");
+ return NULL;
+ }
+ pos += 4;
+
+ for (;;) {
+ end = os_strchr(pos, ';');
+ if (!end)
+ break;
+
+ if (end == pos) {
+ /* Handle terminating ";;" and ignore unexpected ";"
+ * for parsing robustness. */
+ pos++;
+ continue;
+ }
+
+ if (pos[0] == 'C' && pos[1] == ':' && !chan_list)
+ chan_list = pos + 2;
+ else if (pos[0] == 'M' && pos[1] == ':' && !mac)
+ mac = pos + 2;
+ else if (pos[0] == 'I' && pos[1] == ':' && !info)
+ info = pos + 2;
+ else if (pos[0] == 'K' && pos[1] == ':' && !pk)
+ pk = pos + 2;
+ else
+ wpa_hexdump_ascii(MSG_DEBUG,
+ "DPP: Ignore unrecognized URI parameter",
+ pos, end - pos);
+ pos = end + 1;
+ }
+
+ if (!pk) {
+ wpa_printf(MSG_INFO, "DPP: URI missing public-key");
+ return NULL;
+ }
+
+ bi = os_zalloc(sizeof(*bi));
+ if (!bi)
+ return NULL;
+
+ if (dpp_clone_uri(bi, uri) < 0 ||
+ dpp_parse_uri_chan_list(bi, chan_list) < 0 ||
+ dpp_parse_uri_mac(bi, mac) < 0 ||
+ dpp_parse_uri_info(bi, info) < 0 ||
+ dpp_parse_uri_pk(bi, pk) < 0) {
+ dpp_bootstrap_info_free(bi);
+ bi = NULL;
+ }
+
+ return bi;
+}
+
+
+struct dpp_bootstrap_info * dpp_parse_qr_code(const char *uri)
+{
+ struct dpp_bootstrap_info *bi;
+
+ bi = dpp_parse_uri(uri);
+ if (bi)
+ bi->type = DPP_BOOTSTRAP_QR_CODE;
+ return bi;
+}
+
+
+static void dpp_debug_print_key(const char *title, EVP_PKEY *key)
+{
+ EC_KEY *eckey;
+ BIO *out;
+ size_t rlen;
+ char *txt;
+ int res;
+ unsigned char *der = NULL;
+ int der_len;
+ const EC_GROUP *group;
+ const EC_POINT *point;
+
+ out = BIO_new(BIO_s_mem());
+ if (!out)
+ return;
+
+ EVP_PKEY_print_private(out, key, 0, NULL);
+ rlen = BIO_ctrl_pending(out);
+ txt = os_malloc(rlen + 1);
+ if (txt) {
+ res = BIO_read(out, txt, rlen);
+ if (res > 0) {
+ txt[res] = '\0';
+ wpa_printf(MSG_DEBUG, "%s: %s", title, txt);
+ }
+ os_free(txt);
+ }
+ BIO_free(out);
+
+ eckey = EVP_PKEY_get1_EC_KEY(key);
+ if (!eckey)
+ return;
+
+ group = EC_KEY_get0_group(eckey);
+ point = EC_KEY_get0_public_key(eckey);
+ if (group && point)
+ dpp_debug_print_point(title, group, point);
+
+ der_len = i2d_ECPrivateKey(eckey, &der);
+ if (der_len > 0)
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECPrivateKey", der, der_len);
+ OPENSSL_free(der);
+ if (der_len <= 0) {
+ der = NULL;
+ der_len = i2d_EC_PUBKEY(eckey, &der);
+ if (der_len > 0)
+ wpa_hexdump(MSG_DEBUG, "DPP: EC_PUBKEY", der, der_len);
+ OPENSSL_free(der);
+ }
+
+ EC_KEY_free(eckey);
+}
+
+
+static EVP_PKEY * dpp_gen_keypair(const struct dpp_curve_params *curve)
+{
+ EVP_PKEY_CTX *kctx = NULL;
+ EC_KEY *ec_params;
+ EVP_PKEY *params = NULL, *key = NULL;
+ int nid;
+
+ wpa_printf(MSG_DEBUG, "DPP: Generating a keypair");
+
+ nid = OBJ_txt2nid(curve->name);
+ if (nid == NID_undef) {
+ wpa_printf(MSG_INFO, "DPP: Unsupported curve %s", curve->name);
+ return NULL;
+ }
+
+ ec_params = EC_KEY_new_by_curve_name(nid);
+ if (!ec_params) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to generate EC_KEY parameters");
+ goto fail;
+ }
+ EC_KEY_set_asn1_flag(ec_params, OPENSSL_EC_NAMED_CURVE);
+ params = EVP_PKEY_new();
+ if (!params || EVP_PKEY_set1_EC_KEY(params, ec_params) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to generate EVP_PKEY parameters");
+ goto fail;
+ }
+
+ kctx = EVP_PKEY_CTX_new(params, NULL);
+ if (!kctx ||
+ EVP_PKEY_keygen_init(kctx) != 1 ||
+ EVP_PKEY_keygen(kctx, &key) != 1) {
+ wpa_printf(MSG_ERROR, "DPP: Failed to generate EC key");
+ goto fail;
+ }
+
+ if (wpa_debug_show_keys)
+ dpp_debug_print_key("Own generated key", key);
+
+ EVP_PKEY_free(params);
+ EVP_PKEY_CTX_free(kctx);
+ return key;
+fail:
+ EVP_PKEY_CTX_free(kctx);
+ EVP_PKEY_free(params);
+ return NULL;
+}
+
+
+static const struct dpp_curve_params *
+dpp_get_curve_name(const char *name)
+{
+ int i;
+
+ for (i = 0; dpp_curves[i].name; i++) {
+ if (os_strcmp(name, dpp_curves[i].name) == 0 ||
+ (dpp_curves[i].jwk_crv &&
+ os_strcmp(name, dpp_curves[i].jwk_crv) == 0))
+ return &dpp_curves[i];
+ }
+ return NULL;
+}
+
+
+static const struct dpp_curve_params *
+dpp_get_curve_jwk_crv(const char *name)
+{
+ int i;
+
+ for (i = 0; dpp_curves[i].name; i++) {
+ if (dpp_curves[i].jwk_crv &&
+ os_strcmp(name, dpp_curves[i].jwk_crv) == 0)
+ return &dpp_curves[i];
+ }
+ return NULL;
+}
+
+
+static EVP_PKEY * dpp_set_keypair(const struct dpp_curve_params **curve,
+ const u8 *privkey, size_t privkey_len)
+{
+ EVP_PKEY *pkey;
+ EC_KEY *eckey;
+ const EC_GROUP *group;
+ int nid;
+
+ pkey = EVP_PKEY_new();
+ if (!pkey)
+ return NULL;
+ eckey = d2i_ECPrivateKey(NULL, &privkey, privkey_len);
+ if (!eckey) {
+ wpa_printf(MSG_INFO,
+ "DPP: OpenSSL: d2i_ECPrivateKey() failed: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ EVP_PKEY_free(pkey);
+ return NULL;
+ }
+ group = EC_KEY_get0_group(eckey);
+ if (!group) {
+ EC_KEY_free(eckey);
+ EVP_PKEY_free(pkey);
+ return NULL;
+ }
+ nid = EC_GROUP_get_curve_name(group);
+ *curve = dpp_get_curve_nid(nid);
+ if (!*curve) {
+ wpa_printf(MSG_INFO,
+ "DPP: Unsupported curve (nid=%d) in pre-assigned key",
+ nid);
+ EC_KEY_free(eckey);
+ EVP_PKEY_free(pkey);
+ return NULL;
+ }
+
+ if (EVP_PKEY_assign_EC_KEY(pkey, eckey) != 1) {
+ EC_KEY_free(eckey);
+ EVP_PKEY_free(pkey);
+ return NULL;
+ }
+ return pkey;
+}
+
+
+typedef struct {
+ /* AlgorithmIdentifier ecPublicKey with optional parameters present
+ * as an OID identifying the curve */
+ X509_ALGOR *alg;
+ /* Compressed format public key per ANSI X9.63 */
+ ASN1_BIT_STRING *pub_key;
+} DPP_BOOTSTRAPPING_KEY;
+
+ASN1_SEQUENCE(DPP_BOOTSTRAPPING_KEY) = {
+ ASN1_SIMPLE(DPP_BOOTSTRAPPING_KEY, alg, X509_ALGOR),
+ ASN1_SIMPLE(DPP_BOOTSTRAPPING_KEY, pub_key, ASN1_BIT_STRING)
+} ASN1_SEQUENCE_END(DPP_BOOTSTRAPPING_KEY);
+
+IMPLEMENT_ASN1_FUNCTIONS(DPP_BOOTSTRAPPING_KEY);
+
+
+static struct wpabuf * dpp_bootstrap_key_der(EVP_PKEY *key)
+{
+ unsigned char *der = NULL;
+ int der_len;
+ EC_KEY *eckey;
+ struct wpabuf *ret = NULL;
+ size_t len;
+ const EC_GROUP *group;
+ const EC_POINT *point;
+ BN_CTX *ctx;
+ DPP_BOOTSTRAPPING_KEY *bootstrap = NULL;
+ int nid;
+
+ ctx = BN_CTX_new();
+ eckey = EVP_PKEY_get1_EC_KEY(key);
+ if (!ctx || !eckey)
+ goto fail;
+
+ group = EC_KEY_get0_group(eckey);
+ point = EC_KEY_get0_public_key(eckey);
+ if (!group || !point)
+ goto fail;
+ dpp_debug_print_point("DPP: bootstrap public key", group, point);
+ nid = EC_GROUP_get_curve_name(group);
+
+ bootstrap = DPP_BOOTSTRAPPING_KEY_new();
+ if (!bootstrap ||
+ X509_ALGOR_set0(bootstrap->alg, OBJ_nid2obj(EVP_PKEY_EC),
+ V_ASN1_OBJECT, (void *) OBJ_nid2obj(nid)) != 1)
+ goto fail;
+
+ len = EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED,
+ NULL, 0, ctx);
+ if (len == 0)
+ goto fail;
+
+ der = OPENSSL_malloc(len);
+ if (!der)
+ goto fail;
+ len = EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED,
+ der, len, ctx);
+
+ OPENSSL_free(bootstrap->pub_key->data);
+ bootstrap->pub_key->data = der;
+ der = NULL;
+ bootstrap->pub_key->length = len;
+ /* No unused bits */
+ bootstrap->pub_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
+ bootstrap->pub_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
+
+ der_len = i2d_DPP_BOOTSTRAPPING_KEY(bootstrap, &der);
+ if (der_len <= 0) {
+ wpa_printf(MSG_ERROR,
+ "DDP: Failed to build DER encoded public key");
+ goto fail;
+ }
+
+ ret = wpabuf_alloc_copy(der, der_len);
+fail:
+ DPP_BOOTSTRAPPING_KEY_free(bootstrap);
+ OPENSSL_free(der);
+ EC_KEY_free(eckey);
+ BN_CTX_free(ctx);
+ return ret;
+}
+
+
+int dpp_bootstrap_key_hash(struct dpp_bootstrap_info *bi)
+{
+ struct wpabuf *der;
+ int res;
+ const u8 *addr[1];
+ size_t len[1];
+
+ der = dpp_bootstrap_key_der(bi->pubkey);
+ if (!der)
+ return -1;
+ wpa_hexdump_buf(MSG_DEBUG, "DPP: Compressed public key (DER)",
+ der);
+
+ addr[0] = wpabuf_head(der);
+ len[0] = wpabuf_len(der);
+ res = sha256_vector(1, addr, len, bi->pubkey_hash);
+ if (res < 0)
+ wpa_printf(MSG_DEBUG, "DPP: Failed to hash public key");
+ else
+ wpa_hexdump(MSG_DEBUG, "DPP: Public key hash", bi->pubkey_hash,
+ SHA256_MAC_LEN);
+ wpabuf_free(der);
+ return res;
+}
+
+
+char * dpp_keygen(struct dpp_bootstrap_info *bi, const char *curve,
+ const u8 *privkey, size_t privkey_len)
+{
+ unsigned char *base64 = NULL;
+ char *pos, *end;
+ size_t len;
+ struct wpabuf *der = NULL;
+ const u8 *addr[1];
+ int res;
+
+ if (!curve) {
+ bi->curve = &dpp_curves[0];
+ } else {
+ bi->curve = dpp_get_curve_name(curve);
+ if (!bi->curve) {
+ wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s",
+ curve);
+ return NULL;
+ }
+ }
+ if (privkey)
+ bi->pubkey = dpp_set_keypair(&bi->curve, privkey, privkey_len);
+ else
+ bi->pubkey = dpp_gen_keypair(bi->curve);
+ if (!bi->pubkey)
+ goto fail;
+ bi->own = 1;
+
+ der = dpp_bootstrap_key_der(bi->pubkey);
+ if (!der)
+ goto fail;
+ wpa_hexdump_buf(MSG_DEBUG, "DPP: Compressed public key (DER)",
+ der);
+
+ addr[0] = wpabuf_head(der);
+ len = wpabuf_len(der);
+ res = sha256_vector(1, addr, &len, bi->pubkey_hash);
+ if (res < 0) {
+ wpa_printf(MSG_DEBUG, "DPP: Failed to hash public key");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: Public key hash", bi->pubkey_hash,
+ SHA256_MAC_LEN);
+
+ base64 = base64_encode(wpabuf_head(der), wpabuf_len(der), &len);
+ wpabuf_free(der);
+ der = NULL;
+ if (!base64)
+ goto fail;
+ pos = (char *) base64;
+ end = pos + len;
+ for (;;) {
+ pos = os_strchr(pos, '\n');
+ if (!pos)
+ break;
+ os_memmove(pos, pos + 1, end - pos);
+ }
+ return (char *) base64;
+fail:
+ os_free(base64);
+ wpabuf_free(der);
+ return NULL;
+}
+
+
+static int dpp_derive_k1(const u8 *Mx, size_t Mx_len, u8 *k1,
+ unsigned int hash_len)
+{
+ u8 salt[DPP_MAX_HASH_LEN], prk[DPP_MAX_HASH_LEN];
+ const char *info = "first intermediate key";
+ int res;
+
+ /* k1 = HKDF(<>, "first intermediate key", M.x) */
+
+ /* HKDF-Extract(<>, M.x) */
+ os_memset(salt, 0, hash_len);
+ if (dpp_hmac(hash_len, salt, hash_len, Mx, Mx_len, prk) < 0)
+ return -1;
+ wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM=M.x)",
+ prk, hash_len);
+
+ /* HKDF-Expand(PRK, info, L) */
+ res = dpp_hkdf_expand(hash_len, prk, hash_len, info, k1, hash_len);
+ os_memset(prk, 0, hash_len);
+ if (res < 0)
+ return -1;
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: k1 = HKDF-Expand(PRK, info, L)",
+ k1, hash_len);
+ return 0;
+}
+
+
+static int dpp_derive_k2(const u8 *Nx, size_t Nx_len, u8 *k2,
+ unsigned int hash_len)
+{
+ u8 salt[DPP_MAX_HASH_LEN], prk[DPP_MAX_HASH_LEN];
+ const char *info = "second intermediate key";
+ int res;
+
+ /* k2 = HKDF(<>, "second intermediate key", N.x) */
+
+ /* HKDF-Extract(<>, N.x) */
+ os_memset(salt, 0, hash_len);
+ res = dpp_hmac(hash_len, salt, hash_len, Nx, Nx_len, prk);
+ if (res < 0)
+ return -1;
+ wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM=N.x)",
+ prk, hash_len);
+
+ /* HKDF-Expand(PRK, info, L) */
+ res = dpp_hkdf_expand(hash_len, prk, hash_len, info, k2, hash_len);
+ os_memset(prk, 0, hash_len);
+ if (res < 0)
+ return -1;
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: k2 = HKDF-Expand(PRK, info, L)",
+ k2, hash_len);
+ return 0;
+}
+
+
+static int dpp_derive_ke(struct dpp_authentication *auth, u8 *ke,
+ unsigned int hash_len)
+{
+ size_t nonce_len;
+ u8 nonces[2 * DPP_MAX_NONCE_LEN];
+ const char *info_ke = "DPP Key";
+ u8 prk[DPP_MAX_HASH_LEN];
+ int res;
+ const u8 *addr[3];
+ size_t len[3];
+ size_t num_elem = 0;
+
+ if (!auth->Mx_len || !auth->Nx_len) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Mx/Nx not available - cannot derive ke");
+ return -1;
+ }
+
+ /* ke = HKDF(I-nonce | R-nonce, "DPP Key", M.x | N.x [| L.x]) */
+
+ /* HKDF-Extract(I-nonce | R-nonce, M.x | N.x [| L.x]) */
+ nonce_len = auth->curve->nonce_len;
+ os_memcpy(nonces, auth->i_nonce, nonce_len);
+ os_memcpy(&nonces[nonce_len], auth->r_nonce, nonce_len);
+ addr[num_elem] = auth->Mx;
+ len[num_elem] = auth->Mx_len;
+ num_elem++;
+ addr[num_elem] = auth->Nx;
+ len[num_elem] = auth->Nx_len;
+ num_elem++;
+ if (auth->peer_bi && auth->own_bi) {
+ if (!auth->Lx_len) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Lx not available - cannot derive ke");
+ return -1;
+ }
+ addr[num_elem] = auth->Lx;
+ len[num_elem] = auth->secret_len;
+ num_elem++;
+ }
+ res = dpp_hmac_vector(hash_len, nonces, 2 * nonce_len,
+ num_elem, addr, len, prk);
+ if (res < 0)
+ return -1;
+ wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM)",
+ prk, hash_len);
+
+ /* HKDF-Expand(PRK, info, L) */
+ res = dpp_hkdf_expand(hash_len, prk, hash_len, info_ke, ke, hash_len);
+ os_memset(prk, 0, hash_len);
+ if (res < 0)
+ return -1;
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ke = HKDF-Expand(PRK, info, L)",
+ ke, hash_len);
+ return 0;
+}
+
+
+static void dpp_build_attr_status(struct wpabuf *msg,
+ enum dpp_status_error status)
+{
+ wpa_printf(MSG_DEBUG, "DPP: Status %d", status);
+ wpabuf_put_le16(msg, DPP_ATTR_STATUS);
+ wpabuf_put_le16(msg, 1);
+ wpabuf_put_u8(msg, status);
+}
+
+
+static void dpp_build_attr_r_bootstrap_key_hash(struct wpabuf *msg,
+ const u8 *hash)
+{
+ if (hash) {
+ wpa_printf(MSG_DEBUG, "DPP: R-Bootstrap Key Hash");
+ wpabuf_put_le16(msg, DPP_ATTR_R_BOOTSTRAP_KEY_HASH);
+ wpabuf_put_le16(msg, SHA256_MAC_LEN);
+ wpabuf_put_data(msg, hash, SHA256_MAC_LEN);
+ }
+}
+
+
+static void dpp_build_attr_i_bootstrap_key_hash(struct wpabuf *msg,
+ const u8 *hash)
+{
+ if (hash) {
+ wpa_printf(MSG_DEBUG, "DPP: I-Bootstrap Key Hash");
+ wpabuf_put_le16(msg, DPP_ATTR_I_BOOTSTRAP_KEY_HASH);
+ wpabuf_put_le16(msg, SHA256_MAC_LEN);
+ wpabuf_put_data(msg, hash, SHA256_MAC_LEN);
+ }
+}
+
+
+static struct wpabuf * dpp_auth_build_req(struct dpp_authentication *auth,
+ const struct wpabuf *pi,
+ size_t nonce_len,
+ const u8 *r_pubkey_hash,
+ const u8 *i_pubkey_hash,
+ unsigned int neg_freq)
+{
+ struct wpabuf *msg;
+ u8 clear[4 + DPP_MAX_NONCE_LEN + 4 + 1];
+ u8 wrapped_data[4 + DPP_MAX_NONCE_LEN + 4 + 1 + AES_BLOCK_SIZE];
+ u8 *pos;
+ const u8 *addr[2];
+ size_t len[2], siv_len, attr_len;
+ u8 *attr_start, *attr_end;
+
+ /* Build DPP Authentication Request frame attributes */
+ attr_len = 2 * (4 + SHA256_MAC_LEN) + 4 + (pi ? wpabuf_len(pi) : 0) +
+ 4 + sizeof(wrapped_data);
+ if (neg_freq > 0)
+ attr_len += 4 + 2;
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_REQ)
+ attr_len += 5;
+#endif /* CONFIG_TESTING_OPTIONS */
+ msg = dpp_alloc_msg(DPP_PA_AUTHENTICATION_REQ, attr_len);
+ if (!msg)
+ return NULL;
+
+ attr_start = wpabuf_put(msg, 0);
+
+ /* Responder Bootstrapping Key Hash */
+ dpp_build_attr_r_bootstrap_key_hash(msg, r_pubkey_hash);
+
+ /* Initiator Bootstrapping Key Hash */
+ dpp_build_attr_i_bootstrap_key_hash(msg, i_pubkey_hash);
+
+ /* Initiator Protocol Key */
+ if (pi) {
+ wpabuf_put_le16(msg, DPP_ATTR_I_PROTOCOL_KEY);
+ wpabuf_put_le16(msg, wpabuf_len(pi));
+ wpabuf_put_buf(msg, pi);
+ }
+
+ /* Channel */
+ if (neg_freq > 0) {
+ u8 op_class, channel;
+
+ if (ieee80211_freq_to_channel_ext(neg_freq, 0, 0, &op_class,
+ &channel) ==
+ NUM_HOSTAPD_MODES) {
+ wpa_printf(MSG_INFO,
+ "DPP: Unsupported negotiation frequency request: %d",
+ neg_freq);
+ wpabuf_free(msg);
+ return NULL;
+ }
+ wpabuf_put_le16(msg, DPP_ATTR_CHANNEL);
+ wpabuf_put_le16(msg, 2);
+ wpabuf_put_u8(msg, op_class);
+ wpabuf_put_u8(msg, channel);
+ }
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_AUTH_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
+ goto skip_wrapped_data;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* Wrapped data ({I-nonce, I-capabilities}k1) */
+ pos = clear;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_I_NONCE_AUTH_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no I-nonce");
+ goto skip_i_nonce;
+ }
+ if (dpp_test == DPP_TEST_INVALID_I_NONCE_AUTH_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid I-nonce");
+ WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE);
+ pos += 2;
+ WPA_PUT_LE16(pos, nonce_len - 1);
+ pos += 2;
+ os_memcpy(pos, auth->i_nonce, nonce_len - 1);
+ pos += nonce_len - 1;
+ goto skip_i_nonce;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* I-nonce */
+ WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE);
+ pos += 2;
+ WPA_PUT_LE16(pos, nonce_len);
+ pos += 2;
+ os_memcpy(pos, auth->i_nonce, nonce_len);
+ pos += nonce_len;
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_i_nonce:
+ if (dpp_test == DPP_TEST_NO_I_CAPAB_AUTH_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no I-capab");
+ goto skip_i_capab;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* I-capabilities */
+ WPA_PUT_LE16(pos, DPP_ATTR_I_CAPABILITIES);
+ pos += 2;
+ WPA_PUT_LE16(pos, 1);
+ pos += 2;
+ auth->i_capab = auth->allowed_roles;
+ *pos++ = auth->i_capab;
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_ZERO_I_CAPAB) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - zero I-capabilities");
+ pos[-1] = 0;
+ }
+skip_i_capab:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ attr_end = wpabuf_put(msg, 0);
+
+ /* OUI, OUI type, Crypto Suite, DPP frame type */
+ addr[0] = wpabuf_head_u8(msg) + 2;
+ len[0] = 3 + 1 + 1 + 1;
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+
+ /* Attributes before Wrapped Data */
+ addr[1] = attr_start;
+ len[1] = attr_end - attr_start;
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+
+ siv_len = pos - clear;
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", clear, siv_len);
+ if (aes_siv_encrypt(auth->k1, auth->curve->hash_len, clear, siv_len,
+ 2, addr, len, wrapped_data) < 0) {
+ wpabuf_free(msg);
+ return NULL;
+ }
+ siv_len += AES_BLOCK_SIZE;
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped_data, siv_len);
+
+ wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
+ wpabuf_put_le16(msg, siv_len);
+ wpabuf_put_data(msg, wrapped_data, siv_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
+ dpp_build_attr_status(msg, DPP_STATUS_OK);
+ }
+skip_wrapped_data:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ wpa_hexdump_buf(MSG_DEBUG,
+ "DPP: Authentication Request frame attributes", msg);
+
+ return msg;
+}
+
+
+static struct wpabuf * dpp_auth_build_resp(struct dpp_authentication *auth,
+ enum dpp_status_error status,
+ const struct wpabuf *pr,
+ size_t nonce_len,
+ const u8 *r_pubkey_hash,
+ const u8 *i_pubkey_hash,
+ const u8 *r_nonce, const u8 *i_nonce,
+ const u8 *wrapped_r_auth,
+ size_t wrapped_r_auth_len,
+ const u8 *siv_key)
+{
+ struct wpabuf *msg;
+#define DPP_AUTH_RESP_CLEAR_LEN 2 * (4 + DPP_MAX_NONCE_LEN) + 4 + 1 + \
+ 4 + 4 + DPP_MAX_HASH_LEN + AES_BLOCK_SIZE
+ u8 clear[DPP_AUTH_RESP_CLEAR_LEN];
+ u8 wrapped_data[DPP_AUTH_RESP_CLEAR_LEN + AES_BLOCK_SIZE];
+ const u8 *addr[2];
+ size_t len[2], siv_len, attr_len;
+ u8 *attr_start, *attr_end, *pos;
+
+ auth->waiting_auth_conf = 1;
+ auth->auth_resp_tries = 0;
+
+ /* Build DPP Authentication Response frame attributes */
+ attr_len = 4 + 1 + 2 * (4 + SHA256_MAC_LEN) +
+ 4 + (pr ? wpabuf_len(pr) : 0) + 4 + sizeof(wrapped_data);
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_RESP)
+ attr_len += 5;
+#endif /* CONFIG_TESTING_OPTIONS */
+ msg = dpp_alloc_msg(DPP_PA_AUTHENTICATION_RESP, attr_len);
+ if (!msg)
+ return NULL;
+
+ attr_start = wpabuf_put(msg, 0);
+
+ /* DPP Status */
+ if (status != 255)
+ dpp_build_attr_status(msg, status);
+
+ /* Responder Bootstrapping Key Hash */
+ dpp_build_attr_r_bootstrap_key_hash(msg, r_pubkey_hash);
+
+ /* Initiator Bootstrapping Key Hash (mutual authentication) */
+ dpp_build_attr_i_bootstrap_key_hash(msg, i_pubkey_hash);
+
+ /* Responder Protocol Key */
+ if (pr) {
+ wpabuf_put_le16(msg, DPP_ATTR_R_PROTOCOL_KEY);
+ wpabuf_put_le16(msg, wpabuf_len(pr));
+ wpabuf_put_buf(msg, pr);
+ }
+
+ attr_end = wpabuf_put(msg, 0);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
+ goto skip_wrapped_data;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* Wrapped data ({R-nonce, I-nonce, R-capabilities, {R-auth}ke}k2) */
+ pos = clear;
+
+ if (r_nonce) {
+ /* R-nonce */
+ WPA_PUT_LE16(pos, DPP_ATTR_R_NONCE);
+ pos += 2;
+ WPA_PUT_LE16(pos, nonce_len);
+ pos += 2;
+ os_memcpy(pos, r_nonce, nonce_len);
+ pos += nonce_len;
+ }
+
+ if (i_nonce) {
+ /* I-nonce */
+ WPA_PUT_LE16(pos, DPP_ATTR_I_NONCE);
+ pos += 2;
+ WPA_PUT_LE16(pos, nonce_len);
+ pos += 2;
+ os_memcpy(pos, i_nonce, nonce_len);
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_I_NONCE_MISMATCH_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - I-nonce mismatch");
+ pos[nonce_len / 2] ^= 0x01;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+ pos += nonce_len;
+ }
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_R_CAPAB_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no R-capab");
+ goto skip_r_capab;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* R-capabilities */
+ WPA_PUT_LE16(pos, DPP_ATTR_R_CAPABILITIES);
+ pos += 2;
+ WPA_PUT_LE16(pos, 1);
+ pos += 2;
+ auth->r_capab = auth->configurator ? DPP_CAPAB_CONFIGURATOR :
+ DPP_CAPAB_ENROLLEE;
+ *pos++ = auth->r_capab;
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_ZERO_R_CAPAB) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - zero R-capabilities");
+ pos[-1] = 0;
+ } else if (dpp_test == DPP_TEST_INCOMPATIBLE_R_CAPAB_AUTH_RESP) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - incompatible R-capabilities");
+ if ((auth->i_capab & DPP_CAPAB_ROLE_MASK) ==
+ (DPP_CAPAB_CONFIGURATOR | DPP_CAPAB_ENROLLEE))
+ pos[-1] = 0;
+ else
+ pos[-1] = auth->configurator ? DPP_CAPAB_ENROLLEE :
+ DPP_CAPAB_CONFIGURATOR;
+ }
+skip_r_capab:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ if (wrapped_r_auth) {
+ /* {R-auth}ke */
+ WPA_PUT_LE16(pos, DPP_ATTR_WRAPPED_DATA);
+ pos += 2;
+ WPA_PUT_LE16(pos, wrapped_r_auth_len);
+ pos += 2;
+ os_memcpy(pos, wrapped_r_auth, wrapped_r_auth_len);
+ pos += wrapped_r_auth_len;
+ }
+
+ /* OUI, OUI type, Crypto Suite, DPP frame type */
+ addr[0] = wpabuf_head_u8(msg) + 2;
+ len[0] = 3 + 1 + 1 + 1;
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+
+ /* Attributes before Wrapped Data */
+ addr[1] = attr_start;
+ len[1] = attr_end - attr_start;
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+
+ siv_len = pos - clear;
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext", clear, siv_len);
+ if (aes_siv_encrypt(siv_key, auth->curve->hash_len, clear, siv_len,
+ 2, addr, len, wrapped_data) < 0) {
+ wpabuf_free(msg);
+ return NULL;
+ }
+ siv_len += AES_BLOCK_SIZE;
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped_data, siv_len);
+
+ wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
+ wpabuf_put_le16(msg, siv_len);
+ wpabuf_put_data(msg, wrapped_data, siv_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
+ dpp_build_attr_status(msg, DPP_STATUS_OK);
+ }
+skip_wrapped_data:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ wpa_hexdump_buf(MSG_DEBUG,
+ "DPP: Authentication Response frame attributes", msg);
+ return msg;
+}
+
+
+static int dpp_channel_ok_init(struct hostapd_hw_modes *own_modes,
+ u16 num_modes, unsigned int freq)
+{
+ u16 m;
+ int c, flag;
+
+ if (!own_modes || !num_modes)
+ return 1;
+
+ for (m = 0; m < num_modes; m++) {
+ for (c = 0; c < own_modes[m].num_channels; c++) {
+ if ((unsigned int) own_modes[m].channels[c].freq !=
+ freq)
+ continue;
+ flag = own_modes[m].channels[c].flag;
+ if (!(flag & (HOSTAPD_CHAN_DISABLED |
+ HOSTAPD_CHAN_NO_IR |
+ HOSTAPD_CHAN_RADAR)))
+ return 1;
+ }
+ }
+
+ wpa_printf(MSG_DEBUG, "DPP: Peer channel %u MHz not supported", freq);
+ return 0;
+}
+
+
+static int freq_included(const unsigned int freqs[], unsigned int num,
+ unsigned int freq)
+{
+ while (num > 0) {
+ if (freqs[--num] == freq)
+ return 1;
+ }
+ return 0;
+}
+
+
+static void freq_to_start(unsigned int freqs[], unsigned int num,
+ unsigned int freq)
+{
+ unsigned int i;
+
+ for (i = 0; i < num; i++) {
+ if (freqs[i] == freq)
+ break;
+ }
+ if (i == 0 || i >= num)
+ return;
+ os_memmove(&freqs[1], &freqs[0], i * sizeof(freqs[0]));
+ freqs[0] = freq;
+}
+
+
+static int dpp_channel_intersect(struct dpp_authentication *auth,
+ struct hostapd_hw_modes *own_modes,
+ u16 num_modes)
+{
+ struct dpp_bootstrap_info *peer_bi = auth->peer_bi;
+ unsigned int i, freq;
+
+ for (i = 0; i < peer_bi->num_freq; i++) {
+ freq = peer_bi->freq[i];
+ if (freq_included(auth->freq, auth->num_freq, freq))
+ continue;
+ if (dpp_channel_ok_init(own_modes, num_modes, freq))
+ auth->freq[auth->num_freq++] = freq;
+ }
+ if (!auth->num_freq) {
+ wpa_printf(MSG_INFO,
+ "DPP: No available channels for initiating DPP Authentication");
+ return -1;
+ }
+ auth->curr_freq = auth->freq[0];
+ return 0;
+}
+
+
+static int dpp_channel_local_list(struct dpp_authentication *auth,
+ struct hostapd_hw_modes *own_modes,
+ u16 num_modes)
+{
+ u16 m;
+ int c, flag;
+ unsigned int freq;
+
+ auth->num_freq = 0;
+
+ if (!own_modes || !num_modes) {
+ auth->freq[0] = 2412;
+ auth->freq[1] = 2437;
+ auth->freq[2] = 2462;
+ auth->num_freq = 3;
+ return 0;
+ }
+
+ for (m = 0; m < num_modes; m++) {
+ for (c = 0; c < own_modes[m].num_channels; c++) {
+ freq = own_modes[m].channels[c].freq;
+ flag = own_modes[m].channels[c].flag;
+ if (flag & (HOSTAPD_CHAN_DISABLED |
+ HOSTAPD_CHAN_NO_IR |
+ HOSTAPD_CHAN_RADAR))
+ continue;
+ if (freq_included(auth->freq, auth->num_freq, freq))
+ continue;
+ auth->freq[auth->num_freq++] = freq;
+ if (auth->num_freq == DPP_BOOTSTRAP_MAX_FREQ) {
+ m = num_modes;
+ break;
+ }
+ }
+ }
+
+ return auth->num_freq == 0 ? -1 : 0;
+}
+
+
+static int dpp_prepare_channel_list(struct dpp_authentication *auth,
+ struct hostapd_hw_modes *own_modes,
+ u16 num_modes)
+{
+ int res;
+ char freqs[DPP_BOOTSTRAP_MAX_FREQ * 6 + 10], *pos, *end;
+ unsigned int i;
+
+ if (auth->peer_bi->num_freq > 0)
+ res = dpp_channel_intersect(auth, own_modes, num_modes);
+ else
+ res = dpp_channel_local_list(auth, own_modes, num_modes);
+ if (res < 0)
+ return res;
+
+ /* Prioritize 2.4 GHz channels 6, 1, 11 (in this order) to hit the most
+ * likely channels first. */
+ freq_to_start(auth->freq, auth->num_freq, 2462);
+ freq_to_start(auth->freq, auth->num_freq, 2412);
+ freq_to_start(auth->freq, auth->num_freq, 2437);
+
+ auth->freq_idx = 0;
+ auth->curr_freq = auth->freq[0];
+
+ pos = freqs;
+ end = pos + sizeof(freqs);
+ for (i = 0; i < auth->num_freq; i++) {
+ res = os_snprintf(pos, end - pos, " %u", auth->freq[i]);
+ if (os_snprintf_error(end - pos, res))
+ break;
+ pos += res;
+ }
+ *pos = '\0';
+ wpa_printf(MSG_DEBUG, "DPP: Possible frequencies for initiating:%s",
+ freqs);
+
+ return 0;
+}
+
+
+static int dpp_autogen_bootstrap_key(struct dpp_authentication *auth)
+{
+ struct dpp_bootstrap_info *bi;
+ char *pk = NULL;
+ size_t len;
+
+ if (auth->own_bi)
+ return 0; /* already generated */
+
+ bi = os_zalloc(sizeof(*bi));
+ if (!bi)
+ return -1;
+ bi->type = DPP_BOOTSTRAP_QR_CODE;
+ pk = dpp_keygen(bi, auth->peer_bi->curve->name, NULL, 0);
+ if (!pk)
+ goto fail;
+
+ len = 4; /* "DPP:" */
+ len += 4 + os_strlen(pk);
+ bi->uri = os_malloc(len + 1);
+ if (!bi->uri)
+ goto fail;
+ os_snprintf(bi->uri, len + 1, "DPP:K:%s;;", pk);
+ wpa_printf(MSG_DEBUG,
+ "DPP: Auto-generated own bootstrapping key info: URI %s",
+ bi->uri);
+
+ auth->tmp_own_bi = auth->own_bi = bi;
+
+ os_free(pk);
+
+ return 0;
+fail:
+ os_free(pk);
+ dpp_bootstrap_info_free(bi);
+ return -1;
+}
+
+
+struct dpp_authentication * dpp_auth_init(void *msg_ctx,
+ struct dpp_bootstrap_info *peer_bi,
+ struct dpp_bootstrap_info *own_bi,
+ u8 dpp_allowed_roles,
+ unsigned int neg_freq,
+ struct hostapd_hw_modes *own_modes,
+ u16 num_modes)
+{
+ struct dpp_authentication *auth;
+ size_t nonce_len;
+ EVP_PKEY_CTX *ctx = NULL;
+ size_t secret_len;
+ struct wpabuf *pi = NULL;
+ const u8 *r_pubkey_hash, *i_pubkey_hash;
+#ifdef CONFIG_TESTING_OPTIONS
+ u8 test_hash[SHA256_MAC_LEN];
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ auth = os_zalloc(sizeof(*auth));
+ if (!auth)
+ return NULL;
+ auth->msg_ctx = msg_ctx;
+ auth->initiator = 1;
+ auth->waiting_auth_resp = 1;
+ auth->allowed_roles = dpp_allowed_roles;
+ auth->configurator = !!(dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR);
+ auth->peer_bi = peer_bi;
+ auth->own_bi = own_bi;
+ auth->curve = peer_bi->curve;
+
+ if (dpp_autogen_bootstrap_key(auth) < 0 ||
+ dpp_prepare_channel_list(auth, own_modes, num_modes) < 0)
+ goto fail;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_nonce_override_len > 0) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - override I-nonce");
+ nonce_len = dpp_nonce_override_len;
+ os_memcpy(auth->i_nonce, dpp_nonce_override, nonce_len);
+ } else {
+ nonce_len = auth->curve->nonce_len;
+ if (random_get_bytes(auth->i_nonce, nonce_len)) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to generate I-nonce");
+ goto fail;
+ }
+ }
+#else /* CONFIG_TESTING_OPTIONS */
+ nonce_len = auth->curve->nonce_len;
+ if (random_get_bytes(auth->i_nonce, nonce_len)) {
+ wpa_printf(MSG_ERROR, "DPP: Failed to generate I-nonce");
+ goto fail;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+ wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", auth->i_nonce, nonce_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_protocol_key_override_len) {
+ const struct dpp_curve_params *tmp_curve;
+
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - override protocol key");
+ auth->own_protocol_key = dpp_set_keypair(
+ &tmp_curve, dpp_protocol_key_override,
+ dpp_protocol_key_override_len);
+ } else {
+ auth->own_protocol_key = dpp_gen_keypair(auth->curve);
+ }
+#else /* CONFIG_TESTING_OPTIONS */
+ auth->own_protocol_key = dpp_gen_keypair(auth->curve);
+#endif /* CONFIG_TESTING_OPTIONS */
+ if (!auth->own_protocol_key)
+ goto fail;
+
+ pi = dpp_get_pubkey_point(auth->own_protocol_key, 0);
+ if (!pi)
+ goto fail;
+
+ /* ECDH: M = pI * BR */
+ ctx = EVP_PKEY_CTX_new(auth->own_protocol_key, NULL);
+ if (!ctx ||
+ EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, auth->peer_bi->pubkey) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &secret_len) != 1 ||
+ secret_len > DPP_MAX_SHARED_SECRET_LEN ||
+ EVP_PKEY_derive(ctx, auth->Mx, &secret_len) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to derive ECDH shared secret: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+ auth->secret_len = secret_len;
+ EVP_PKEY_CTX_free(ctx);
+ ctx = NULL;
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (M.x)",
+ auth->Mx, auth->secret_len);
+ auth->Mx_len = auth->secret_len;
+
+ if (dpp_derive_k1(auth->Mx, auth->secret_len, auth->k1,
+ auth->curve->hash_len) < 0)
+ goto fail;
+
+ r_pubkey_hash = auth->peer_bi->pubkey_hash;
+ i_pubkey_hash = auth->own_bi->pubkey_hash;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
+ r_pubkey_hash = NULL;
+ } else if (dpp_test == DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - invalid R-Bootstrap Key Hash");
+ os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
+ test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
+ r_pubkey_hash = test_hash;
+ } else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
+ i_pubkey_hash = NULL;
+ } else if (dpp_test == DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_REQ) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - invalid I-Bootstrap Key Hash");
+ os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
+ test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
+ i_pubkey_hash = test_hash;
+ } else if (dpp_test == DPP_TEST_NO_I_PROTO_KEY_AUTH_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no I-Proto Key");
+ wpabuf_free(pi);
+ pi = NULL;
+ } else if (dpp_test == DPP_TEST_INVALID_I_PROTO_KEY_AUTH_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid I-Proto Key");
+ wpabuf_free(pi);
+ pi = wpabuf_alloc(2 * auth->curve->prime_len);
+ if (!pi || dpp_test_gen_invalid_key(pi, auth->curve) < 0)
+ goto fail;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ auth->req_msg = dpp_auth_build_req(auth, pi, nonce_len, r_pubkey_hash,
+ i_pubkey_hash, neg_freq);
+ if (!auth->req_msg)
+ goto fail;
+
+out:
+ wpabuf_free(pi);
+ EVP_PKEY_CTX_free(ctx);
+ return auth;
+fail:
+ dpp_auth_deinit(auth);
+ auth = NULL;
+ goto out;
+}
+
+
+struct wpabuf * dpp_build_conf_req(struct dpp_authentication *auth,
+ const char *json)
+{
+ size_t nonce_len;
+ size_t json_len, clear_len;
+ struct wpabuf *clear = NULL, *msg = NULL;
+ u8 *wrapped;
+ size_t attr_len;
+
+ wpa_printf(MSG_DEBUG, "DPP: Build configuration request");
+
+ nonce_len = auth->curve->nonce_len;
+ if (random_get_bytes(auth->e_nonce, nonce_len)) {
+ wpa_printf(MSG_ERROR, "DPP: Failed to generate E-nonce");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: E-nonce", auth->e_nonce, nonce_len);
+ json_len = os_strlen(json);
+ wpa_hexdump_ascii(MSG_DEBUG, "DPP: configAttr JSON", json, json_len);
+
+ /* { E-nonce, configAttrib }ke */
+ clear_len = 4 + nonce_len + 4 + json_len;
+ clear = wpabuf_alloc(clear_len);
+ attr_len = 4 + clear_len + AES_BLOCK_SIZE;
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_REQ)
+ attr_len += 5;
+#endif /* CONFIG_TESTING_OPTIONS */
+ msg = wpabuf_alloc(attr_len);
+ if (!clear || !msg)
+ goto fail;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_E_NONCE_CONF_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no E-nonce");
+ goto skip_e_nonce;
+ }
+ if (dpp_test == DPP_TEST_INVALID_E_NONCE_CONF_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid E-nonce");
+ wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
+ wpabuf_put_le16(clear, nonce_len - 1);
+ wpabuf_put_data(clear, auth->e_nonce, nonce_len - 1);
+ goto skip_e_nonce;
+ }
+ if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_CONF_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
+ goto skip_wrapped_data;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* E-nonce */
+ wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
+ wpabuf_put_le16(clear, nonce_len);
+ wpabuf_put_data(clear, auth->e_nonce, nonce_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_e_nonce:
+ if (dpp_test == DPP_TEST_NO_CONFIG_ATTR_OBJ_CONF_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no configAttrib");
+ goto skip_conf_attr_obj;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* configAttrib */
+ wpabuf_put_le16(clear, DPP_ATTR_CONFIG_ATTR_OBJ);
+ wpabuf_put_le16(clear, json_len);
+ wpabuf_put_data(clear, json, json_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_conf_attr_obj:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
+ wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
+ wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
+
+ /* No AES-SIV AD */
+ wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
+ if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
+ wpabuf_head(clear), wpabuf_len(clear),
+ 0, NULL, NULL, wrapped) < 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
+ dpp_build_attr_status(msg, DPP_STATUS_OK);
+ }
+skip_wrapped_data:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ wpa_hexdump_buf(MSG_DEBUG,
+ "DPP: Configuration Request frame attributes", msg);
+ wpabuf_free(clear);
+ return msg;
+
+fail:
+ wpabuf_free(clear);
+ wpabuf_free(msg);
+ return NULL;
+}
+
+
+static void dpp_auth_success(struct dpp_authentication *auth)
+{
+ wpa_printf(MSG_DEBUG,
+ "DPP: Authentication success - clear temporary keys");
+ os_memset(auth->Mx, 0, sizeof(auth->Mx));
+ auth->Mx_len = 0;
+ os_memset(auth->Nx, 0, sizeof(auth->Nx));
+ auth->Nx_len = 0;
+ os_memset(auth->Lx, 0, sizeof(auth->Lx));
+ auth->Lx_len = 0;
+ os_memset(auth->k1, 0, sizeof(auth->k1));
+ os_memset(auth->k2, 0, sizeof(auth->k2));
+
+ auth->auth_success = 1;
+}
+
+
+static int dpp_gen_r_auth(struct dpp_authentication *auth, u8 *r_auth)
+{
+ struct wpabuf *pix, *prx, *bix, *brx;
+ const u8 *addr[7];
+ size_t len[7];
+ size_t i, num_elem = 0;
+ size_t nonce_len;
+ u8 zero = 0;
+ int res = -1;
+
+ /* R-auth = H(I-nonce | R-nonce | PI.x | PR.x | [BI.x |] BR.x | 0) */
+ nonce_len = auth->curve->nonce_len;
+
+ if (auth->initiator) {
+ pix = dpp_get_pubkey_point(auth->own_protocol_key, 0);
+ prx = dpp_get_pubkey_point(auth->peer_protocol_key, 0);
+ if (auth->own_bi)
+ bix = dpp_get_pubkey_point(auth->own_bi->pubkey, 0);
+ else
+ bix = NULL;
+ brx = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0);
+ } else {
+ pix = dpp_get_pubkey_point(auth->peer_protocol_key, 0);
+ prx = dpp_get_pubkey_point(auth->own_protocol_key, 0);
+ if (auth->peer_bi)
+ bix = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0);
+ else
+ bix = NULL;
+ brx = dpp_get_pubkey_point(auth->own_bi->pubkey, 0);
+ }
+ if (!pix || !prx || !brx)
+ goto fail;
+
+ addr[num_elem] = auth->i_nonce;
+ len[num_elem] = nonce_len;
+ num_elem++;
+
+ addr[num_elem] = auth->r_nonce;
+ len[num_elem] = nonce_len;
+ num_elem++;
+
+ addr[num_elem] = wpabuf_head(pix);
+ len[num_elem] = wpabuf_len(pix) / 2;
+ num_elem++;
+
+ addr[num_elem] = wpabuf_head(prx);
+ len[num_elem] = wpabuf_len(prx) / 2;
+ num_elem++;
+
+ if (bix) {
+ addr[num_elem] = wpabuf_head(bix);
+ len[num_elem] = wpabuf_len(bix) / 2;
+ num_elem++;
+ }
+
+ addr[num_elem] = wpabuf_head(brx);
+ len[num_elem] = wpabuf_len(brx) / 2;
+ num_elem++;
+
+ addr[num_elem] = &zero;
+ len[num_elem] = 1;
+ num_elem++;
+
+ wpa_printf(MSG_DEBUG, "DPP: R-auth hash components");
+ for (i = 0; i < num_elem; i++)
+ wpa_hexdump(MSG_DEBUG, "DPP: hash component", addr[i], len[i]);
+ res = dpp_hash_vector(auth->curve, num_elem, addr, len, r_auth);
+ if (res == 0)
+ wpa_hexdump(MSG_DEBUG, "DPP: R-auth", r_auth,
+ auth->curve->hash_len);
+fail:
+ wpabuf_free(pix);
+ wpabuf_free(prx);
+ wpabuf_free(bix);
+ wpabuf_free(brx);
+ return res;
+}
+
+
+static int dpp_gen_i_auth(struct dpp_authentication *auth, u8 *i_auth)
+{
+ struct wpabuf *pix = NULL, *prx = NULL, *bix = NULL, *brx = NULL;
+ const u8 *addr[7];
+ size_t len[7];
+ size_t i, num_elem = 0;
+ size_t nonce_len;
+ u8 one = 1;
+ int res = -1;
+
+ /* I-auth = H(R-nonce | I-nonce | PR.x | PI.x | BR.x | [BI.x |] 1) */
+ nonce_len = auth->curve->nonce_len;
+
+ if (auth->initiator) {
+ pix = dpp_get_pubkey_point(auth->own_protocol_key, 0);
+ prx = dpp_get_pubkey_point(auth->peer_protocol_key, 0);
+ if (auth->own_bi)
+ bix = dpp_get_pubkey_point(auth->own_bi->pubkey, 0);
+ else
+ bix = NULL;
+ if (!auth->peer_bi)
+ goto fail;
+ brx = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0);
+ } else {
+ pix = dpp_get_pubkey_point(auth->peer_protocol_key, 0);
+ prx = dpp_get_pubkey_point(auth->own_protocol_key, 0);
+ if (auth->peer_bi)
+ bix = dpp_get_pubkey_point(auth->peer_bi->pubkey, 0);
+ else
+ bix = NULL;
+ if (!auth->own_bi)
+ goto fail;
+ brx = dpp_get_pubkey_point(auth->own_bi->pubkey, 0);
+ }
+ if (!pix || !prx || !brx)
+ goto fail;
+
+ addr[num_elem] = auth->r_nonce;
+ len[num_elem] = nonce_len;
+ num_elem++;
+
+ addr[num_elem] = auth->i_nonce;
+ len[num_elem] = nonce_len;
+ num_elem++;
+
+ addr[num_elem] = wpabuf_head(prx);
+ len[num_elem] = wpabuf_len(prx) / 2;
+ num_elem++;
+
+ addr[num_elem] = wpabuf_head(pix);
+ len[num_elem] = wpabuf_len(pix) / 2;
+ num_elem++;
+
+ addr[num_elem] = wpabuf_head(brx);
+ len[num_elem] = wpabuf_len(brx) / 2;
+ num_elem++;
+
+ if (bix) {
+ addr[num_elem] = wpabuf_head(bix);
+ len[num_elem] = wpabuf_len(bix) / 2;
+ num_elem++;
+ }
+
+ addr[num_elem] = &one;
+ len[num_elem] = 1;
+ num_elem++;
+
+ wpa_printf(MSG_DEBUG, "DPP: I-auth hash components");
+ for (i = 0; i < num_elem; i++)
+ wpa_hexdump(MSG_DEBUG, "DPP: hash component", addr[i], len[i]);
+ res = dpp_hash_vector(auth->curve, num_elem, addr, len, i_auth);
+ if (res == 0)
+ wpa_hexdump(MSG_DEBUG, "DPP: I-auth", i_auth,
+ auth->curve->hash_len);
+fail:
+ wpabuf_free(pix);
+ wpabuf_free(prx);
+ wpabuf_free(bix);
+ wpabuf_free(brx);
+ return res;
+}
+
+
+static int dpp_auth_derive_l_responder(struct dpp_authentication *auth)
+{
+ const EC_GROUP *group;
+ EC_POINT *l = NULL;
+ EC_KEY *BI = NULL, *bR = NULL, *pR = NULL;
+ const EC_POINT *BI_point;
+ BN_CTX *bnctx;
+ BIGNUM *lx, *sum, *q;
+ const BIGNUM *bR_bn, *pR_bn;
+ int ret = -1;
+
+ /* L = ((bR + pR) modulo q) * BI */
+
+ bnctx = BN_CTX_new();
+ sum = BN_new();
+ q = BN_new();
+ lx = BN_new();
+ if (!bnctx || !sum || !q || !lx)
+ goto fail;
+ BI = EVP_PKEY_get1_EC_KEY(auth->peer_bi->pubkey);
+ if (!BI)
+ goto fail;
+ BI_point = EC_KEY_get0_public_key(BI);
+ group = EC_KEY_get0_group(BI);
+ if (!group)
+ goto fail;
+
+ bR = EVP_PKEY_get1_EC_KEY(auth->own_bi->pubkey);
+ pR = EVP_PKEY_get1_EC_KEY(auth->own_protocol_key);
+ if (!bR || !pR)
+ goto fail;
+ bR_bn = EC_KEY_get0_private_key(bR);
+ pR_bn = EC_KEY_get0_private_key(pR);
+ if (!bR_bn || !pR_bn)
+ goto fail;
+ if (EC_GROUP_get_order(group, q, bnctx) != 1 ||
+ BN_mod_add(sum, bR_bn, pR_bn, q, bnctx) != 1)
+ goto fail;
+ l = EC_POINT_new(group);
+ if (!l ||
+ EC_POINT_mul(group, l, NULL, BI_point, sum, bnctx) != 1 ||
+ EC_POINT_get_affine_coordinates_GFp(group, l, lx, NULL,
+ bnctx) != 1) {
+ wpa_printf(MSG_ERROR,
+ "OpenSSL: failed: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+
+ if (dpp_bn2bin_pad(lx, auth->Lx, auth->secret_len) < 0)
+ goto fail;
+ wpa_hexdump_key(MSG_DEBUG, "DPP: L.x", auth->Lx, auth->secret_len);
+ auth->Lx_len = auth->secret_len;
+ ret = 0;
+fail:
+ EC_POINT_clear_free(l);
+ EC_KEY_free(BI);
+ EC_KEY_free(bR);
+ EC_KEY_free(pR);
+ BN_clear_free(lx);
+ BN_clear_free(sum);
+ BN_free(q);
+ BN_CTX_free(bnctx);
+ return ret;
+}
+
+
+static int dpp_auth_derive_l_initiator(struct dpp_authentication *auth)
+{
+ const EC_GROUP *group;
+ EC_POINT *l = NULL, *sum = NULL;
+ EC_KEY *bI = NULL, *BR = NULL, *PR = NULL;
+ const EC_POINT *BR_point, *PR_point;
+ BN_CTX *bnctx;
+ BIGNUM *lx;
+ const BIGNUM *bI_bn;
+ int ret = -1;
+
+ /* L = bI * (BR + PR) */
+
+ bnctx = BN_CTX_new();
+ lx = BN_new();
+ if (!bnctx || !lx)
+ goto fail;
+ BR = EVP_PKEY_get1_EC_KEY(auth->peer_bi->pubkey);
+ PR = EVP_PKEY_get1_EC_KEY(auth->peer_protocol_key);
+ if (!BR || !PR)
+ goto fail;
+ BR_point = EC_KEY_get0_public_key(BR);
+ PR_point = EC_KEY_get0_public_key(PR);
+
+ bI = EVP_PKEY_get1_EC_KEY(auth->own_bi->pubkey);
+ if (!bI)
+ goto fail;
+ group = EC_KEY_get0_group(bI);
+ bI_bn = EC_KEY_get0_private_key(bI);
+ if (!group || !bI_bn)
+ goto fail;
+ sum = EC_POINT_new(group);
+ l = EC_POINT_new(group);
+ if (!sum || !l ||
+ EC_POINT_add(group, sum, BR_point, PR_point, bnctx) != 1 ||
+ EC_POINT_mul(group, l, NULL, sum, bI_bn, bnctx) != 1 ||
+ EC_POINT_get_affine_coordinates_GFp(group, l, lx, NULL,
+ bnctx) != 1) {
+ wpa_printf(MSG_ERROR,
+ "OpenSSL: failed: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+
+ if (dpp_bn2bin_pad(lx, auth->Lx, auth->secret_len) < 0)
+ goto fail;
+ wpa_hexdump_key(MSG_DEBUG, "DPP: L.x", auth->Lx, auth->secret_len);
+ auth->Lx_len = auth->secret_len;
+ ret = 0;
+fail:
+ EC_POINT_clear_free(l);
+ EC_POINT_clear_free(sum);
+ EC_KEY_free(bI);
+ EC_KEY_free(BR);
+ EC_KEY_free(PR);
+ BN_clear_free(lx);
+ BN_CTX_free(bnctx);
+ return ret;
+}
+
+
+static int dpp_auth_build_resp_ok(struct dpp_authentication *auth)
+{
+ size_t nonce_len;
+ EVP_PKEY_CTX *ctx = NULL;
+ size_t secret_len;
+ struct wpabuf *msg, *pr = NULL;
+ u8 r_auth[4 + DPP_MAX_HASH_LEN];
+ u8 wrapped_r_auth[4 + DPP_MAX_HASH_LEN + AES_BLOCK_SIZE], *w_r_auth;
+ size_t wrapped_r_auth_len;
+ int ret = -1;
+ const u8 *r_pubkey_hash, *i_pubkey_hash, *r_nonce, *i_nonce;
+ enum dpp_status_error status = DPP_STATUS_OK;
+#ifdef CONFIG_TESTING_OPTIONS
+ u8 test_hash[SHA256_MAC_LEN];
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ wpa_printf(MSG_DEBUG, "DPP: Build Authentication Response");
+ if (!auth->own_bi)
+ return -1;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_nonce_override_len > 0) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - override R-nonce");
+ nonce_len = dpp_nonce_override_len;
+ os_memcpy(auth->r_nonce, dpp_nonce_override, nonce_len);
+ } else {
+ nonce_len = auth->curve->nonce_len;
+ if (random_get_bytes(auth->r_nonce, nonce_len)) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to generate R-nonce");
+ goto fail;
+ }
+ }
+#else /* CONFIG_TESTING_OPTIONS */
+ nonce_len = auth->curve->nonce_len;
+ if (random_get_bytes(auth->r_nonce, nonce_len)) {
+ wpa_printf(MSG_ERROR, "DPP: Failed to generate R-nonce");
+ goto fail;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+ wpa_hexdump(MSG_DEBUG, "DPP: R-nonce", auth->r_nonce, nonce_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_protocol_key_override_len) {
+ const struct dpp_curve_params *tmp_curve;
+
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - override protocol key");
+ auth->own_protocol_key = dpp_set_keypair(
+ &tmp_curve, dpp_protocol_key_override,
+ dpp_protocol_key_override_len);
+ } else {
+ auth->own_protocol_key = dpp_gen_keypair(auth->curve);
+ }
+#else /* CONFIG_TESTING_OPTIONS */
+ auth->own_protocol_key = dpp_gen_keypair(auth->curve);
+#endif /* CONFIG_TESTING_OPTIONS */
+ if (!auth->own_protocol_key)
+ goto fail;
+
+ pr = dpp_get_pubkey_point(auth->own_protocol_key, 0);
+ if (!pr)
+ goto fail;
+
+ /* ECDH: N = pR * PI */
+ ctx = EVP_PKEY_CTX_new(auth->own_protocol_key, NULL);
+ if (!ctx ||
+ EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, auth->peer_protocol_key) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &secret_len) != 1 ||
+ secret_len > DPP_MAX_SHARED_SECRET_LEN ||
+ EVP_PKEY_derive(ctx, auth->Nx, &secret_len) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to derive ECDH shared secret: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+ EVP_PKEY_CTX_free(ctx);
+ ctx = NULL;
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)",
+ auth->Nx, auth->secret_len);
+ auth->Nx_len = auth->secret_len;
+
+ if (dpp_derive_k2(auth->Nx, auth->secret_len, auth->k2,
+ auth->curve->hash_len) < 0)
+ goto fail;
+
+ if (auth->own_bi && auth->peer_bi) {
+ /* Mutual authentication */
+ if (dpp_auth_derive_l_responder(auth) < 0)
+ goto fail;
+ }
+
+ if (dpp_derive_ke(auth, auth->ke, auth->curve->hash_len) < 0)
+ goto fail;
+
+ /* R-auth = H(I-nonce | R-nonce | PI.x | PR.x | [BI.x |] BR.x | 0) */
+ WPA_PUT_LE16(r_auth, DPP_ATTR_R_AUTH_TAG);
+ WPA_PUT_LE16(&r_auth[2], auth->curve->hash_len);
+ if (dpp_gen_r_auth(auth, r_auth + 4) < 0)
+ goto fail;
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_R_AUTH_MISMATCH_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - R-auth mismatch");
+ r_auth[4 + auth->curve->hash_len / 2] ^= 0x01;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+ if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
+ r_auth, 4 + auth->curve->hash_len,
+ 0, NULL, NULL, wrapped_r_auth) < 0)
+ goto fail;
+ wrapped_r_auth_len = 4 + auth->curve->hash_len + AES_BLOCK_SIZE;
+ wpa_hexdump(MSG_DEBUG, "DPP: {R-auth}ke",
+ wrapped_r_auth, wrapped_r_auth_len);
+ w_r_auth = wrapped_r_auth;
+
+ r_pubkey_hash = auth->own_bi->pubkey_hash;
+ if (auth->peer_bi)
+ i_pubkey_hash = auth->peer_bi->pubkey_hash;
+ else
+ i_pubkey_hash = NULL;
+
+ i_nonce = auth->i_nonce;
+ r_nonce = auth->r_nonce;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
+ r_pubkey_hash = NULL;
+ } else if (dpp_test ==
+ DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - invalid R-Bootstrap Key Hash");
+ os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
+ test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
+ r_pubkey_hash = test_hash;
+ } else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
+ i_pubkey_hash = NULL;
+ } else if (dpp_test ==
+ DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - invalid I-Bootstrap Key Hash");
+ if (i_pubkey_hash)
+ os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
+ else
+ os_memset(test_hash, 0, SHA256_MAC_LEN);
+ test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
+ i_pubkey_hash = test_hash;
+ } else if (dpp_test == DPP_TEST_NO_R_PROTO_KEY_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no R-Proto Key");
+ wpabuf_free(pr);
+ pr = NULL;
+ } else if (dpp_test == DPP_TEST_INVALID_R_PROTO_KEY_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid R-Proto Key");
+ wpabuf_free(pr);
+ pr = wpabuf_alloc(2 * auth->curve->prime_len);
+ if (!pr || dpp_test_gen_invalid_key(pr, auth->curve) < 0)
+ goto fail;
+ } else if (dpp_test == DPP_TEST_NO_R_AUTH_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no R-Auth");
+ w_r_auth = NULL;
+ wrapped_r_auth_len = 0;
+ } else if (dpp_test == DPP_TEST_NO_STATUS_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Status");
+ status = 255;
+ } else if (dpp_test == DPP_TEST_INVALID_STATUS_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
+ status = 254;
+ } else if (dpp_test == DPP_TEST_NO_R_NONCE_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no R-nonce");
+ r_nonce = NULL;
+ } else if (dpp_test == DPP_TEST_NO_I_NONCE_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no I-nonce");
+ i_nonce = NULL;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ msg = dpp_auth_build_resp(auth, status, pr, nonce_len,
+ r_pubkey_hash, i_pubkey_hash,
+ r_nonce, i_nonce,
+ w_r_auth, wrapped_r_auth_len,
+ auth->k2);
+ if (!msg)
+ goto fail;
+ wpabuf_free(auth->resp_msg);
+ auth->resp_msg = msg;
+ ret = 0;
+fail:
+ wpabuf_free(pr);
+ return ret;
+}
+
+
+static int dpp_auth_build_resp_status(struct dpp_authentication *auth,
+ enum dpp_status_error status)
+{
+ struct wpabuf *msg;
+ const u8 *r_pubkey_hash, *i_pubkey_hash, *i_nonce;
+#ifdef CONFIG_TESTING_OPTIONS
+ u8 test_hash[SHA256_MAC_LEN];
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ if (!auth->own_bi)
+ return -1;
+ wpa_printf(MSG_DEBUG, "DPP: Build Authentication Response");
+
+ r_pubkey_hash = auth->own_bi->pubkey_hash;
+ if (auth->peer_bi)
+ i_pubkey_hash = auth->peer_bi->pubkey_hash;
+ else
+ i_pubkey_hash = NULL;
+
+ i_nonce = auth->i_nonce;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
+ r_pubkey_hash = NULL;
+ } else if (dpp_test ==
+ DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - invalid R-Bootstrap Key Hash");
+ os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
+ test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
+ r_pubkey_hash = test_hash;
+ } else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
+ i_pubkey_hash = NULL;
+ } else if (dpp_test ==
+ DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_RESP) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - invalid I-Bootstrap Key Hash");
+ if (i_pubkey_hash)
+ os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
+ else
+ os_memset(test_hash, 0, SHA256_MAC_LEN);
+ test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
+ i_pubkey_hash = test_hash;
+ } else if (dpp_test == DPP_TEST_NO_STATUS_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Status");
+ status = 255;
+ } else if (dpp_test == DPP_TEST_NO_I_NONCE_AUTH_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no I-nonce");
+ i_nonce = NULL;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ msg = dpp_auth_build_resp(auth, status, NULL, auth->curve->nonce_len,
+ r_pubkey_hash, i_pubkey_hash,
+ NULL, i_nonce, NULL, 0, auth->k1);
+ if (!msg)
+ return -1;
+ wpabuf_free(auth->resp_msg);
+ auth->resp_msg = msg;
+ return 0;
+}
+
+
+struct dpp_authentication *
+dpp_auth_req_rx(void *msg_ctx, u8 dpp_allowed_roles, int qr_mutual,
+ struct dpp_bootstrap_info *peer_bi,
+ struct dpp_bootstrap_info *own_bi,
+ unsigned int freq, const u8 *hdr, const u8 *attr_start,
+ size_t attr_len)
+{
+ EVP_PKEY *pi = NULL;
+ EVP_PKEY_CTX *ctx = NULL;
+ size_t secret_len;
+ const u8 *addr[2];
+ size_t len[2];
+ u8 *unwrapped = NULL;
+ size_t unwrapped_len = 0;
+ const u8 *wrapped_data, *i_proto, *i_nonce, *i_capab, *i_bootstrap,
+ *channel;
+ u16 wrapped_data_len, i_proto_len, i_nonce_len, i_capab_len,
+ i_bootstrap_len, channel_len;
+ struct dpp_authentication *auth = NULL;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_STOP_AT_AUTH_REQ) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - stop at Authentication Request");
+ return NULL;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
+ &wrapped_data_len);
+ if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
+ wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
+ "Missing or invalid required Wrapped Data attribute");
+ return NULL;
+ }
+ wpa_hexdump(MSG_MSGDUMP, "DPP: Wrapped Data",
+ wrapped_data, wrapped_data_len);
+ attr_len = wrapped_data - 4 - attr_start;
+
+ auth = os_zalloc(sizeof(*auth));
+ if (!auth)
+ goto fail;
+ auth->msg_ctx = msg_ctx;
+ auth->peer_bi = peer_bi;
+ auth->own_bi = own_bi;
+ auth->curve = own_bi->curve;
+ auth->curr_freq = freq;
+
+ channel = dpp_get_attr(attr_start, attr_len, DPP_ATTR_CHANNEL,
+ &channel_len);
+ if (channel) {
+ int neg_freq;
+
+ if (channel_len < 2) {
+ dpp_auth_fail(auth, "Too short Channel attribute");
+ goto fail;
+ }
+
+ neg_freq = ieee80211_chan_to_freq(NULL, channel[0], channel[1]);
+ wpa_printf(MSG_DEBUG,
+ "DPP: Initiator requested different channel for negotiation: op_class=%u channel=%u --> freq=%d",
+ channel[0], channel[1], neg_freq);
+ if (neg_freq < 0) {
+ dpp_auth_fail(auth,
+ "Unsupported Channel attribute value");
+ goto fail;
+ }
+
+ if (auth->curr_freq != (unsigned int) neg_freq) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Changing negotiation channel from %u MHz to %u MHz",
+ freq, neg_freq);
+ auth->curr_freq = neg_freq;
+ }
+ }
+
+ i_proto = dpp_get_attr(attr_start, attr_len, DPP_ATTR_I_PROTOCOL_KEY,
+ &i_proto_len);
+ if (!i_proto) {
+ dpp_auth_fail(auth,
+ "Missing required Initiator Protocol Key attribute");
+ goto fail;
+ }
+ wpa_hexdump(MSG_MSGDUMP, "DPP: Initiator Protocol Key",
+ i_proto, i_proto_len);
+
+ /* M = bR * PI */
+ pi = dpp_set_pubkey_point(own_bi->pubkey, i_proto, i_proto_len);
+ if (!pi) {
+ dpp_auth_fail(auth, "Invalid Initiator Protocol Key");
+ goto fail;
+ }
+ dpp_debug_print_key("Peer (Initiator) Protocol Key", pi);
+
+ ctx = EVP_PKEY_CTX_new(own_bi->pubkey, NULL);
+ if (!ctx ||
+ EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, pi) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &secret_len) != 1 ||
+ secret_len > DPP_MAX_SHARED_SECRET_LEN ||
+ EVP_PKEY_derive(ctx, auth->Mx, &secret_len) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to derive ECDH shared secret: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ dpp_auth_fail(auth, "Failed to derive ECDH shared secret");
+ goto fail;
+ }
+ auth->secret_len = secret_len;
+ EVP_PKEY_CTX_free(ctx);
+ ctx = NULL;
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (M.x)",
+ auth->Mx, auth->secret_len);
+ auth->Mx_len = auth->secret_len;
+
+ if (dpp_derive_k1(auth->Mx, auth->secret_len, auth->k1,
+ auth->curve->hash_len) < 0)
+ goto fail;
+
+ addr[0] = hdr;
+ len[0] = DPP_HDR_LEN;
+ addr[1] = attr_start;
+ len[1] = attr_len;
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped_data, wrapped_data_len);
+ unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
+ unwrapped = os_malloc(unwrapped_len);
+ if (!unwrapped)
+ goto fail;
+ if (aes_siv_decrypt(auth->k1, auth->curve->hash_len,
+ wrapped_data, wrapped_data_len,
+ 2, addr, len, unwrapped) < 0) {
+ dpp_auth_fail(auth, "AES-SIV decryption failed");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
+ unwrapped, unwrapped_len);
+
+ if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
+ dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
+ goto fail;
+ }
+
+ i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE,
+ &i_nonce_len);
+ if (!i_nonce || i_nonce_len != auth->curve->nonce_len) {
+ dpp_auth_fail(auth, "Missing or invalid I-nonce");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len);
+ os_memcpy(auth->i_nonce, i_nonce, i_nonce_len);
+
+ i_capab = dpp_get_attr(unwrapped, unwrapped_len,
+ DPP_ATTR_I_CAPABILITIES,
+ &i_capab_len);
+ if (!i_capab || i_capab_len < 1) {
+ dpp_auth_fail(auth, "Missing or invalid I-capabilities");
+ goto fail;
+ }
+ auth->i_capab = i_capab[0];
+ wpa_printf(MSG_DEBUG, "DPP: I-capabilities: 0x%02x", auth->i_capab);
+
+ bin_clear_free(unwrapped, unwrapped_len);
+ unwrapped = NULL;
+
+ switch (auth->i_capab & DPP_CAPAB_ROLE_MASK) {
+ case DPP_CAPAB_ENROLLEE:
+ if (!(dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR)) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Local policy does not allow Configurator role");
+ goto not_compatible;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: Acting as Configurator");
+ auth->configurator = 1;
+ break;
+ case DPP_CAPAB_CONFIGURATOR:
+ if (!(dpp_allowed_roles & DPP_CAPAB_ENROLLEE)) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Local policy does not allow Enrollee role");
+ goto not_compatible;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: Acting as Enrollee");
+ auth->configurator = 0;
+ break;
+ case DPP_CAPAB_CONFIGURATOR | DPP_CAPAB_ENROLLEE:
+ if (dpp_allowed_roles & DPP_CAPAB_ENROLLEE) {
+ wpa_printf(MSG_DEBUG, "DPP: Acting as Enrollee");
+ auth->configurator = 0;
+ } else if (dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR) {
+ wpa_printf(MSG_DEBUG, "DPP: Acting as Configurator");
+ auth->configurator = 1;
+ } else {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Local policy does not allow Configurator/Enrollee role");
+ goto not_compatible;
+ }
+ break;
+ default:
+ wpa_printf(MSG_DEBUG, "DPP: Unexpected role in I-capabilities");
+ wpa_msg(auth->msg_ctx, MSG_INFO,
+ DPP_EVENT_FAIL "Invalid role in I-capabilities 0x%02x",
+ auth->i_capab & DPP_CAPAB_ROLE_MASK);
+ goto fail;
+ }
+
+ auth->peer_protocol_key = pi;
+ pi = NULL;
+ if (qr_mutual && !peer_bi && own_bi->type == DPP_BOOTSTRAP_QR_CODE) {
+ char hex[SHA256_MAC_LEN * 2 + 1];
+
+ wpa_printf(MSG_DEBUG,
+ "DPP: Mutual authentication required with QR Codes, but peer info is not yet available - request more time");
+ if (dpp_auth_build_resp_status(auth,
+ DPP_STATUS_RESPONSE_PENDING) < 0)
+ goto fail;
+ i_bootstrap = dpp_get_attr(attr_start, attr_len,
+ DPP_ATTR_I_BOOTSTRAP_KEY_HASH,
+ &i_bootstrap_len);
+ if (i_bootstrap && i_bootstrap_len == SHA256_MAC_LEN) {
+ auth->response_pending = 1;
+ os_memcpy(auth->waiting_pubkey_hash,
+ i_bootstrap, i_bootstrap_len);
+ wpa_snprintf_hex(hex, sizeof(hex), i_bootstrap,
+ i_bootstrap_len);
+ } else {
+ hex[0] = '\0';
+ }
+
+ wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_SCAN_PEER_QR_CODE
+ "%s", hex);
+ return auth;
+ }
+ if (dpp_auth_build_resp_ok(auth) < 0)
+ goto fail;
+
+ return auth;
+
+not_compatible:
+ wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_NOT_COMPATIBLE
+ "i-capab=0x%02x", auth->i_capab);
+ if (dpp_allowed_roles & DPP_CAPAB_CONFIGURATOR)
+ auth->configurator = 1;
+ else
+ auth->configurator = 0;
+ auth->peer_protocol_key = pi;
+ pi = NULL;
+ if (dpp_auth_build_resp_status(auth, DPP_STATUS_NOT_COMPATIBLE) < 0)
+ goto fail;
+
+ auth->remove_on_tx_status = 1;
+ return auth;
+fail:
+ bin_clear_free(unwrapped, unwrapped_len);
+ EVP_PKEY_free(pi);
+ EVP_PKEY_CTX_free(ctx);
+ dpp_auth_deinit(auth);
+ return NULL;
+}
+
+
+int dpp_notify_new_qr_code(struct dpp_authentication *auth,
+ struct dpp_bootstrap_info *peer_bi)
+{
+ if (!auth || !auth->response_pending ||
+ os_memcmp(auth->waiting_pubkey_hash, peer_bi->pubkey_hash,
+ SHA256_MAC_LEN) != 0)
+ return 0;
+
+ wpa_printf(MSG_DEBUG,
+ "DPP: New scanned QR Code has matching public key that was needed to continue DPP Authentication exchange with "
+ MACSTR, MAC2STR(auth->peer_mac_addr));
+ auth->peer_bi = peer_bi;
+
+ if (dpp_auth_build_resp_ok(auth) < 0)
+ return -1;
+
+ return 1;
+}
+
+
+static struct wpabuf * dpp_auth_build_conf(struct dpp_authentication *auth,
+ enum dpp_status_error status)
+{
+ struct wpabuf *msg;
+ u8 i_auth[4 + DPP_MAX_HASH_LEN];
+ size_t i_auth_len;
+ u8 r_nonce[4 + DPP_MAX_NONCE_LEN];
+ size_t r_nonce_len;
+ const u8 *addr[2];
+ size_t len[2], attr_len;
+ u8 *wrapped_i_auth;
+ u8 *wrapped_r_nonce;
+ u8 *attr_start, *attr_end;
+ const u8 *r_pubkey_hash, *i_pubkey_hash;
+#ifdef CONFIG_TESTING_OPTIONS
+ u8 test_hash[SHA256_MAC_LEN];
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ wpa_printf(MSG_DEBUG, "DPP: Build Authentication Confirmation");
+
+ i_auth_len = 4 + auth->curve->hash_len;
+ r_nonce_len = 4 + auth->curve->nonce_len;
+ /* Build DPP Authentication Confirmation frame attributes */
+ attr_len = 4 + 1 + 2 * (4 + SHA256_MAC_LEN) +
+ 4 + i_auth_len + r_nonce_len + AES_BLOCK_SIZE;
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_CONF)
+ attr_len += 5;
+#endif /* CONFIG_TESTING_OPTIONS */
+ msg = dpp_alloc_msg(DPP_PA_AUTHENTICATION_CONF, attr_len);
+ if (!msg)
+ goto fail;
+
+ attr_start = wpabuf_put(msg, 0);
+
+ r_pubkey_hash = auth->peer_bi->pubkey_hash;
+ if (auth->own_bi)
+ i_pubkey_hash = auth->own_bi->pubkey_hash;
+ else
+ i_pubkey_hash = NULL;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_STATUS_AUTH_CONF) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Status");
+ goto skip_status;
+ } else if (dpp_test == DPP_TEST_INVALID_STATUS_AUTH_CONF) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
+ status = 254;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* DPP Status */
+ dpp_build_attr_status(msg, status);
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_status:
+ if (dpp_test == DPP_TEST_NO_R_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no R-Bootstrap Key Hash");
+ r_pubkey_hash = NULL;
+ } else if (dpp_test ==
+ DPP_TEST_INVALID_R_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - invalid R-Bootstrap Key Hash");
+ os_memcpy(test_hash, r_pubkey_hash, SHA256_MAC_LEN);
+ test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
+ r_pubkey_hash = test_hash;
+ } else if (dpp_test == DPP_TEST_NO_I_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no I-Bootstrap Key Hash");
+ i_pubkey_hash = NULL;
+ } else if (dpp_test ==
+ DPP_TEST_INVALID_I_BOOTSTRAP_KEY_HASH_AUTH_CONF) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - invalid I-Bootstrap Key Hash");
+ if (i_pubkey_hash)
+ os_memcpy(test_hash, i_pubkey_hash, SHA256_MAC_LEN);
+ else
+ os_memset(test_hash, 0, SHA256_MAC_LEN);
+ test_hash[SHA256_MAC_LEN - 1] ^= 0x01;
+ i_pubkey_hash = test_hash;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* Responder Bootstrapping Key Hash */
+ dpp_build_attr_r_bootstrap_key_hash(msg, r_pubkey_hash);
+
+ /* Initiator Bootstrapping Key Hash (mutual authentication) */
+ dpp_build_attr_i_bootstrap_key_hash(msg, i_pubkey_hash);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_AUTH_CONF)
+ goto skip_wrapped_data;
+ if (dpp_test == DPP_TEST_NO_I_AUTH_AUTH_CONF)
+ i_auth_len = 0;
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ attr_end = wpabuf_put(msg, 0);
+
+ /* OUI, OUI type, Crypto Suite, DPP frame type */
+ addr[0] = wpabuf_head_u8(msg) + 2;
+ len[0] = 3 + 1 + 1 + 1;
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+
+ /* Attributes before Wrapped Data */
+ addr[1] = attr_start;
+ len[1] = attr_end - attr_start;
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+
+ if (status == DPP_STATUS_OK) {
+ /* I-auth wrapped with ke */
+ wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
+ wpabuf_put_le16(msg, i_auth_len + AES_BLOCK_SIZE);
+ wrapped_i_auth = wpabuf_put(msg, i_auth_len + AES_BLOCK_SIZE);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_I_AUTH_AUTH_CONF)
+ goto skip_i_auth;
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* I-auth = H(R-nonce | I-nonce | PR.x | PI.x | BR.x | [BI.x |]
+ * 1) */
+ WPA_PUT_LE16(i_auth, DPP_ATTR_I_AUTH_TAG);
+ WPA_PUT_LE16(&i_auth[2], auth->curve->hash_len);
+ if (dpp_gen_i_auth(auth, i_auth + 4) < 0)
+ goto fail;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_I_AUTH_MISMATCH_AUTH_CONF) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - I-auth mismatch");
+ i_auth[4 + auth->curve->hash_len / 2] ^= 0x01;
+ }
+skip_i_auth:
+#endif /* CONFIG_TESTING_OPTIONS */
+ if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
+ i_auth, i_auth_len,
+ 2, addr, len, wrapped_i_auth) < 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: {I-auth}ke",
+ wrapped_i_auth, i_auth_len + AES_BLOCK_SIZE);
+ } else {
+ /* R-nonce wrapped with k2 */
+ wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
+ wpabuf_put_le16(msg, r_nonce_len + AES_BLOCK_SIZE);
+ wrapped_r_nonce = wpabuf_put(msg, r_nonce_len + AES_BLOCK_SIZE);
+
+ WPA_PUT_LE16(r_nonce, DPP_ATTR_R_NONCE);
+ WPA_PUT_LE16(&r_nonce[2], auth->curve->nonce_len);
+ os_memcpy(r_nonce + 4, auth->r_nonce, auth->curve->nonce_len);
+
+ if (aes_siv_encrypt(auth->k2, auth->curve->hash_len,
+ r_nonce, r_nonce_len,
+ 2, addr, len, wrapped_r_nonce) < 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: {R-nonce}k2",
+ wrapped_r_nonce, r_nonce_len + AES_BLOCK_SIZE);
+ }
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_AUTH_CONF) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
+ dpp_build_attr_status(msg, DPP_STATUS_OK);
+ }
+skip_wrapped_data:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ wpa_hexdump_buf(MSG_DEBUG,
+ "DPP: Authentication Confirmation frame attributes",
+ msg);
+ if (status == DPP_STATUS_OK)
+ dpp_auth_success(auth);
+
+ return msg;
+
+fail:
+ wpabuf_free(msg);
+ return NULL;
+}
+
+
+static void
+dpp_auth_resp_rx_status(struct dpp_authentication *auth, const u8 *hdr,
+ const u8 *attr_start, size_t attr_len,
+ const u8 *wrapped_data, u16 wrapped_data_len,
+ enum dpp_status_error status)
+{
+ const u8 *addr[2];
+ size_t len[2];
+ u8 *unwrapped = NULL;
+ size_t unwrapped_len = 0;
+ const u8 *i_nonce, *r_capab;
+ u16 i_nonce_len, r_capab_len;
+
+ if (status == DPP_STATUS_NOT_COMPATIBLE) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Responder reported incompatible roles");
+ } else if (status == DPP_STATUS_RESPONSE_PENDING) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Responder reported more time needed");
+ } else {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Responder reported failure (status %d)",
+ status);
+ dpp_auth_fail(auth, "Responder reported failure");
+ return;
+ }
+
+ addr[0] = hdr;
+ len[0] = DPP_HDR_LEN;
+ addr[1] = attr_start;
+ len[1] = attr_len;
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped_data, wrapped_data_len);
+ unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
+ unwrapped = os_malloc(unwrapped_len);
+ if (!unwrapped)
+ goto fail;
+ if (aes_siv_decrypt(auth->k1, auth->curve->hash_len,
+ wrapped_data, wrapped_data_len,
+ 2, addr, len, unwrapped) < 0) {
+ dpp_auth_fail(auth, "AES-SIV decryption failed");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
+ unwrapped, unwrapped_len);
+
+ if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
+ dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
+ goto fail;
+ }
+
+ i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE,
+ &i_nonce_len);
+ if (!i_nonce || i_nonce_len != auth->curve->nonce_len) {
+ dpp_auth_fail(auth, "Missing or invalid I-nonce");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len);
+ if (os_memcmp(auth->i_nonce, i_nonce, i_nonce_len) != 0) {
+ dpp_auth_fail(auth, "I-nonce mismatch");
+ goto fail;
+ }
+
+ r_capab = dpp_get_attr(unwrapped, unwrapped_len,
+ DPP_ATTR_R_CAPABILITIES,
+ &r_capab_len);
+ if (!r_capab || r_capab_len < 1) {
+ dpp_auth_fail(auth, "Missing or invalid R-capabilities");
+ goto fail;
+ }
+ auth->r_capab = r_capab[0];
+ wpa_printf(MSG_DEBUG, "DPP: R-capabilities: 0x%02x", auth->r_capab);
+ if (status == DPP_STATUS_NOT_COMPATIBLE) {
+ wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_NOT_COMPATIBLE
+ "r-capab=0x%02x", auth->r_capab);
+ } else if (status == DPP_STATUS_RESPONSE_PENDING) {
+ u8 role = auth->r_capab & DPP_CAPAB_ROLE_MASK;
+
+ if ((auth->configurator && role != DPP_CAPAB_ENROLLEE) ||
+ (!auth->configurator && role != DPP_CAPAB_CONFIGURATOR)) {
+ wpa_msg(auth->msg_ctx, MSG_INFO,
+ DPP_EVENT_FAIL "Unexpected role in R-capabilities 0x%02x",
+ role);
+ } else {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Continue waiting for full DPP Authentication Response");
+ wpa_msg(auth->msg_ctx, MSG_INFO,
+ DPP_EVENT_RESPONSE_PENDING "%s",
+ auth->tmp_own_bi ? auth->tmp_own_bi->uri : "");
+ }
+ }
+fail:
+ bin_clear_free(unwrapped, unwrapped_len);
+}
+
+
+struct wpabuf *
+dpp_auth_resp_rx(struct dpp_authentication *auth, const u8 *hdr,
+ const u8 *attr_start, size_t attr_len)
+{
+ EVP_PKEY *pr;
+ EVP_PKEY_CTX *ctx = NULL;
+ size_t secret_len;
+ const u8 *addr[2];
+ size_t len[2];
+ u8 *unwrapped = NULL, *unwrapped2 = NULL;
+ size_t unwrapped_len = 0, unwrapped2_len = 0;
+ const u8 *r_bootstrap, *i_bootstrap, *wrapped_data, *status, *r_proto,
+ *r_nonce, *i_nonce, *r_capab, *wrapped2, *r_auth;
+ u16 r_bootstrap_len, i_bootstrap_len, wrapped_data_len, status_len,
+ r_proto_len, r_nonce_len, i_nonce_len, r_capab_len,
+ wrapped2_len, r_auth_len;
+ u8 r_auth2[DPP_MAX_HASH_LEN];
+ u8 role;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_STOP_AT_AUTH_RESP) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - stop at Authentication Response");
+ return NULL;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ if (!auth->initiator || !auth->peer_bi) {
+ dpp_auth_fail(auth, "Unexpected Authentication Response");
+ return NULL;
+ }
+
+ auth->waiting_auth_resp = 0;
+
+ wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
+ &wrapped_data_len);
+ if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
+ dpp_auth_fail(auth,
+ "Missing or invalid required Wrapped Data attribute");
+ return NULL;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data",
+ wrapped_data, wrapped_data_len);
+
+ attr_len = wrapped_data - 4 - attr_start;
+
+ r_bootstrap = dpp_get_attr(attr_start, attr_len,
+ DPP_ATTR_R_BOOTSTRAP_KEY_HASH,
+ &r_bootstrap_len);
+ if (!r_bootstrap || r_bootstrap_len != SHA256_MAC_LEN) {
+ dpp_auth_fail(auth,
+ "Missing or invalid required Responder Bootstrapping Key Hash attribute");
+ return NULL;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: Responder Bootstrapping Key Hash",
+ r_bootstrap, r_bootstrap_len);
+ if (os_memcmp(r_bootstrap, auth->peer_bi->pubkey_hash,
+ SHA256_MAC_LEN) != 0) {
+ dpp_auth_fail(auth,
+ "Unexpected Responder Bootstrapping Key Hash value");
+ wpa_hexdump(MSG_DEBUG,
+ "DPP: Expected Responder Bootstrapping Key Hash",
+ auth->peer_bi->pubkey_hash, SHA256_MAC_LEN);
+ return NULL;
+ }
+
+ i_bootstrap = dpp_get_attr(attr_start, attr_len,
+ DPP_ATTR_I_BOOTSTRAP_KEY_HASH,
+ &i_bootstrap_len);
+ if (i_bootstrap) {
+ if (i_bootstrap_len != SHA256_MAC_LEN) {
+ dpp_auth_fail(auth,
+ "Invalid Initiator Bootstrapping Key Hash attribute");
+ return NULL;
+ }
+ wpa_hexdump(MSG_MSGDUMP,
+ "DPP: Initiator Bootstrapping Key Hash",
+ i_bootstrap, i_bootstrap_len);
+ if (!auth->own_bi ||
+ os_memcmp(i_bootstrap, auth->own_bi->pubkey_hash,
+ SHA256_MAC_LEN) != 0) {
+ dpp_auth_fail(auth,
+ "Initiator Bootstrapping Key Hash attribute did not match");
+ return NULL;
+ }
+ } else if (auth->own_bi && auth->own_bi->type == DPP_BOOTSTRAP_PKEX) {
+ /* PKEX bootstrapping mandates use of mutual authentication */
+ dpp_auth_fail(auth,
+ "Missing Initiator Bootstrapping Key Hash attribute");
+ return NULL;
+ }
+
+ status = dpp_get_attr(attr_start, attr_len, DPP_ATTR_STATUS,
+ &status_len);
+ if (!status || status_len < 1) {
+ dpp_auth_fail(auth,
+ "Missing or invalid required DPP Status attribute");
+ return NULL;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
+ auth->auth_resp_status = status[0];
+ if (status[0] != DPP_STATUS_OK) {
+ dpp_auth_resp_rx_status(auth, hdr, attr_start,
+ attr_len, wrapped_data,
+ wrapped_data_len, status[0]);
+ return NULL;
+ }
+
+ if (!i_bootstrap && auth->own_bi) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Responder decided not to use mutual authentication");
+ auth->own_bi = NULL;
+ }
+
+ wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_AUTH_DIRECTION "mutual=%d",
+ auth->own_bi != NULL);
+
+ r_proto = dpp_get_attr(attr_start, attr_len, DPP_ATTR_R_PROTOCOL_KEY,
+ &r_proto_len);
+ if (!r_proto) {
+ dpp_auth_fail(auth,
+ "Missing required Responder Protocol Key attribute");
+ return NULL;
+ }
+ wpa_hexdump(MSG_MSGDUMP, "DPP: Responder Protocol Key",
+ r_proto, r_proto_len);
+
+ /* N = pI * PR */
+ pr = dpp_set_pubkey_point(auth->own_protocol_key, r_proto, r_proto_len);
+ if (!pr) {
+ dpp_auth_fail(auth, "Invalid Responder Protocol Key");
+ return NULL;
+ }
+ dpp_debug_print_key("Peer (Responder) Protocol Key", pr);
+
+ ctx = EVP_PKEY_CTX_new(auth->own_protocol_key, NULL);
+ if (!ctx ||
+ EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, pr) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &secret_len) != 1 ||
+ secret_len > DPP_MAX_SHARED_SECRET_LEN ||
+ EVP_PKEY_derive(ctx, auth->Nx, &secret_len) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to derive ECDH shared secret: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ dpp_auth_fail(auth, "Failed to derive ECDH shared secret");
+ goto fail;
+ }
+ EVP_PKEY_CTX_free(ctx);
+ ctx = NULL;
+ auth->peer_protocol_key = pr;
+ pr = NULL;
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)",
+ auth->Nx, auth->secret_len);
+ auth->Nx_len = auth->secret_len;
+
+ if (dpp_derive_k2(auth->Nx, auth->secret_len, auth->k2,
+ auth->curve->hash_len) < 0)
+ goto fail;
+
+ addr[0] = hdr;
+ len[0] = DPP_HDR_LEN;
+ addr[1] = attr_start;
+ len[1] = attr_len;
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped_data, wrapped_data_len);
+ unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
+ unwrapped = os_malloc(unwrapped_len);
+ if (!unwrapped)
+ goto fail;
+ if (aes_siv_decrypt(auth->k2, auth->curve->hash_len,
+ wrapped_data, wrapped_data_len,
+ 2, addr, len, unwrapped) < 0) {
+ dpp_auth_fail(auth, "AES-SIV decryption failed");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
+ unwrapped, unwrapped_len);
+
+ if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
+ dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
+ goto fail;
+ }
+
+ r_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_R_NONCE,
+ &r_nonce_len);
+ if (!r_nonce || r_nonce_len != auth->curve->nonce_len) {
+ dpp_auth_fail(auth, "DPP: Missing or invalid R-nonce");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: R-nonce", r_nonce, r_nonce_len);
+ os_memcpy(auth->r_nonce, r_nonce, r_nonce_len);
+
+ i_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_NONCE,
+ &i_nonce_len);
+ if (!i_nonce || i_nonce_len != auth->curve->nonce_len) {
+ dpp_auth_fail(auth, "Missing or invalid I-nonce");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: I-nonce", i_nonce, i_nonce_len);
+ if (os_memcmp(auth->i_nonce, i_nonce, i_nonce_len) != 0) {
+ dpp_auth_fail(auth, "I-nonce mismatch");
+ goto fail;
+ }
+
+ if (auth->own_bi) {
+ /* Mutual authentication */
+ if (dpp_auth_derive_l_initiator(auth) < 0)
+ goto fail;
+ }
+
+ r_capab = dpp_get_attr(unwrapped, unwrapped_len,
+ DPP_ATTR_R_CAPABILITIES,
+ &r_capab_len);
+ if (!r_capab || r_capab_len < 1) {
+ dpp_auth_fail(auth, "Missing or invalid R-capabilities");
+ goto fail;
+ }
+ auth->r_capab = r_capab[0];
+ wpa_printf(MSG_DEBUG, "DPP: R-capabilities: 0x%02x", auth->r_capab);
+ role = auth->r_capab & DPP_CAPAB_ROLE_MASK;
+ if ((auth->allowed_roles ==
+ (DPP_CAPAB_CONFIGURATOR | DPP_CAPAB_ENROLLEE)) &&
+ (role == DPP_CAPAB_CONFIGURATOR || role == DPP_CAPAB_ENROLLEE)) {
+ /* Peer selected its role, so move from "either role" to the
+ * role that is compatible with peer's selection. */
+ auth->configurator = role == DPP_CAPAB_ENROLLEE;
+ wpa_printf(MSG_DEBUG, "DPP: Acting as %s",
+ auth->configurator ? "Configurator" : "Enrollee");
+ } else if ((auth->configurator && role != DPP_CAPAB_ENROLLEE) ||
+ (!auth->configurator && role != DPP_CAPAB_CONFIGURATOR)) {
+ wpa_printf(MSG_DEBUG, "DPP: Incompatible role selection");
+ wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_FAIL
+ "Unexpected role in R-capabilities 0x%02x",
+ role);
+ if (role != DPP_CAPAB_ENROLLEE &&
+ role != DPP_CAPAB_CONFIGURATOR)
+ goto fail;
+ bin_clear_free(unwrapped, unwrapped_len);
+ auth->remove_on_tx_status = 1;
+ return dpp_auth_build_conf(auth, DPP_STATUS_NOT_COMPATIBLE);
+ }
+
+ wrapped2 = dpp_get_attr(unwrapped, unwrapped_len,
+ DPP_ATTR_WRAPPED_DATA, &wrapped2_len);
+ if (!wrapped2 || wrapped2_len < AES_BLOCK_SIZE) {
+ dpp_auth_fail(auth,
+ "Missing or invalid Secondary Wrapped Data");
+ goto fail;
+ }
+
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped2, wrapped2_len);
+
+ if (dpp_derive_ke(auth, auth->ke, auth->curve->hash_len) < 0)
+ goto fail;
+
+ unwrapped2_len = wrapped2_len - AES_BLOCK_SIZE;
+ unwrapped2 = os_malloc(unwrapped2_len);
+ if (!unwrapped2)
+ goto fail;
+ if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
+ wrapped2, wrapped2_len,
+ 0, NULL, NULL, unwrapped2) < 0) {
+ dpp_auth_fail(auth, "AES-SIV decryption failed");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
+ unwrapped2, unwrapped2_len);
+
+ if (dpp_check_attrs(unwrapped2, unwrapped2_len) < 0) {
+ dpp_auth_fail(auth,
+ "Invalid attribute in secondary unwrapped data");
+ goto fail;
+ }
+
+ r_auth = dpp_get_attr(unwrapped2, unwrapped2_len, DPP_ATTR_R_AUTH_TAG,
+ &r_auth_len);
+ if (!r_auth || r_auth_len != auth->curve->hash_len) {
+ dpp_auth_fail(auth,
+ "Missing or invalid Responder Authenticating Tag");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: Received Responder Authenticating Tag",
+ r_auth, r_auth_len);
+ /* R-auth' = H(I-nonce | R-nonce | PI.x | PR.x | [BI.x |] BR.x | 0) */
+ if (dpp_gen_r_auth(auth, r_auth2) < 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: Calculated Responder Authenticating Tag",
+ r_auth2, r_auth_len);
+ if (os_memcmp(r_auth, r_auth2, r_auth_len) != 0) {
+ dpp_auth_fail(auth, "Mismatching Responder Authenticating Tag");
+ bin_clear_free(unwrapped, unwrapped_len);
+ bin_clear_free(unwrapped2, unwrapped2_len);
+ auth->remove_on_tx_status = 1;
+ return dpp_auth_build_conf(auth, DPP_STATUS_AUTH_FAILURE);
+ }
+
+ bin_clear_free(unwrapped, unwrapped_len);
+ bin_clear_free(unwrapped2, unwrapped2_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AUTH_RESP_IN_PLACE_OF_CONF) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - Authentication Response in place of Confirm");
+ if (dpp_auth_build_resp_ok(auth) < 0)
+ return NULL;
+ return wpabuf_dup(auth->resp_msg);
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ return dpp_auth_build_conf(auth, DPP_STATUS_OK);
+
+fail:
+ bin_clear_free(unwrapped, unwrapped_len);
+ bin_clear_free(unwrapped2, unwrapped2_len);
+ EVP_PKEY_free(pr);
+ EVP_PKEY_CTX_free(ctx);
+ return NULL;
+}
+
+
+static int dpp_auth_conf_rx_failure(struct dpp_authentication *auth,
+ const u8 *hdr,
+ const u8 *attr_start, size_t attr_len,
+ const u8 *wrapped_data,
+ u16 wrapped_data_len,
+ enum dpp_status_error status)
+{
+ const u8 *addr[2];
+ size_t len[2];
+ u8 *unwrapped = NULL;
+ size_t unwrapped_len = 0;
+ const u8 *r_nonce;
+ u16 r_nonce_len;
+
+ /* Authentication Confirm failure cases are expected to include
+ * {R-nonce}k2 in the Wrapped Data attribute. */
+
+ addr[0] = hdr;
+ len[0] = DPP_HDR_LEN;
+ addr[1] = attr_start;
+ len[1] = attr_len;
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped_data, wrapped_data_len);
+ unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
+ unwrapped = os_malloc(unwrapped_len);
+ if (!unwrapped) {
+ dpp_auth_fail(auth, "Authentication failed");
+ goto fail;
+ }
+ if (aes_siv_decrypt(auth->k2, auth->curve->hash_len,
+ wrapped_data, wrapped_data_len,
+ 2, addr, len, unwrapped) < 0) {
+ dpp_auth_fail(auth, "AES-SIV decryption failed");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
+ unwrapped, unwrapped_len);
+
+ if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
+ dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
+ goto fail;
+ }
+
+ r_nonce = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_R_NONCE,
+ &r_nonce_len);
+ if (!r_nonce || r_nonce_len != auth->curve->nonce_len) {
+ dpp_auth_fail(auth, "DPP: Missing or invalid R-nonce");
+ goto fail;
+ }
+ if (os_memcmp(r_nonce, auth->r_nonce, r_nonce_len) != 0) {
+ wpa_hexdump(MSG_DEBUG, "DPP: Received R-nonce",
+ r_nonce, r_nonce_len);
+ wpa_hexdump(MSG_DEBUG, "DPP: Expected R-nonce",
+ auth->r_nonce, r_nonce_len);
+ dpp_auth_fail(auth, "R-nonce mismatch");
+ goto fail;
+ }
+
+ if (status == DPP_STATUS_NOT_COMPATIBLE)
+ dpp_auth_fail(auth, "Peer reported incompatible R-capab role");
+ else if (status == DPP_STATUS_AUTH_FAILURE)
+ dpp_auth_fail(auth, "Peer reported authentication failure)");
+
+fail:
+ bin_clear_free(unwrapped, unwrapped_len);
+ return -1;
+}
+
+
+int dpp_auth_conf_rx(struct dpp_authentication *auth, const u8 *hdr,
+ const u8 *attr_start, size_t attr_len)
+{
+ const u8 *r_bootstrap, *i_bootstrap, *wrapped_data, *status, *i_auth;
+ u16 r_bootstrap_len, i_bootstrap_len, wrapped_data_len, status_len,
+ i_auth_len;
+ const u8 *addr[2];
+ size_t len[2];
+ u8 *unwrapped = NULL;
+ size_t unwrapped_len = 0;
+ u8 i_auth2[DPP_MAX_HASH_LEN];
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_STOP_AT_AUTH_CONF) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - stop at Authentication Confirm");
+ return -1;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ if (auth->initiator || !auth->own_bi) {
+ dpp_auth_fail(auth, "Unexpected Authentication Confirm");
+ return -1;
+ }
+
+ auth->waiting_auth_conf = 0;
+
+ wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
+ &wrapped_data_len);
+ if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
+ dpp_auth_fail(auth,
+ "Missing or invalid required Wrapped Data attribute");
+ return -1;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: Wrapped data",
+ wrapped_data, wrapped_data_len);
+
+ attr_len = wrapped_data - 4 - attr_start;
+
+ r_bootstrap = dpp_get_attr(attr_start, attr_len,
+ DPP_ATTR_R_BOOTSTRAP_KEY_HASH,
+ &r_bootstrap_len);
+ if (!r_bootstrap || r_bootstrap_len != SHA256_MAC_LEN) {
+ dpp_auth_fail(auth,
+ "Missing or invalid required Responder Bootstrapping Key Hash attribute");
+ return -1;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: Responder Bootstrapping Key Hash",
+ r_bootstrap, r_bootstrap_len);
+ if (os_memcmp(r_bootstrap, auth->own_bi->pubkey_hash,
+ SHA256_MAC_LEN) != 0) {
+ wpa_hexdump(MSG_DEBUG,
+ "DPP: Expected Responder Bootstrapping Key Hash",
+ auth->peer_bi->pubkey_hash, SHA256_MAC_LEN);
+ dpp_auth_fail(auth,
+ "Responder Bootstrapping Key Hash mismatch");
+ return -1;
+ }
+
+ i_bootstrap = dpp_get_attr(attr_start, attr_len,
+ DPP_ATTR_I_BOOTSTRAP_KEY_HASH,
+ &i_bootstrap_len);
+ if (i_bootstrap) {
+ if (i_bootstrap_len != SHA256_MAC_LEN) {
+ dpp_auth_fail(auth,
+ "Invalid Initiator Bootstrapping Key Hash attribute");
+ return -1;
+ }
+ wpa_hexdump(MSG_MSGDUMP,
+ "DPP: Initiator Bootstrapping Key Hash",
+ i_bootstrap, i_bootstrap_len);
+ if (!auth->peer_bi ||
+ os_memcmp(i_bootstrap, auth->peer_bi->pubkey_hash,
+ SHA256_MAC_LEN) != 0) {
+ dpp_auth_fail(auth,
+ "Initiator Bootstrapping Key Hash mismatch");
+ return -1;
+ }
+ } else if (auth->peer_bi) {
+ /* Mutual authentication and peer did not include its
+ * Bootstrapping Key Hash attribute. */
+ dpp_auth_fail(auth,
+ "Missing Initiator Bootstrapping Key Hash attribute");
+ return -1;
+ }
+
+ status = dpp_get_attr(attr_start, attr_len, DPP_ATTR_STATUS,
+ &status_len);
+ if (!status || status_len < 1) {
+ dpp_auth_fail(auth,
+ "Missing or invalid required DPP Status attribute");
+ return -1;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
+ if (status[0] == DPP_STATUS_NOT_COMPATIBLE ||
+ status[0] == DPP_STATUS_AUTH_FAILURE)
+ return dpp_auth_conf_rx_failure(auth, hdr, attr_start,
+ attr_len, wrapped_data,
+ wrapped_data_len, status[0]);
+
+ if (status[0] != DPP_STATUS_OK) {
+ dpp_auth_fail(auth, "Authentication failed");
+ return -1;
+ }
+
+ addr[0] = hdr;
+ len[0] = DPP_HDR_LEN;
+ addr[1] = attr_start;
+ len[1] = attr_len;
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped_data, wrapped_data_len);
+ unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
+ unwrapped = os_malloc(unwrapped_len);
+ if (!unwrapped)
+ return -1;
+ if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
+ wrapped_data, wrapped_data_len,
+ 2, addr, len, unwrapped) < 0) {
+ dpp_auth_fail(auth, "AES-SIV decryption failed");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
+ unwrapped, unwrapped_len);
+
+ if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
+ dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
+ goto fail;
+ }
+
+ i_auth = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_AUTH_TAG,
+ &i_auth_len);
+ if (!i_auth || i_auth_len != auth->curve->hash_len) {
+ dpp_auth_fail(auth,
+ "Missing or invalid Initiator Authenticating Tag");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: Received Initiator Authenticating Tag",
+ i_auth, i_auth_len);
+ /* I-auth' = H(R-nonce | I-nonce | PR.x | PI.x | BR.x | [BI.x |] 1) */
+ if (dpp_gen_i_auth(auth, i_auth2) < 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: Calculated Initiator Authenticating Tag",
+ i_auth2, i_auth_len);
+ if (os_memcmp(i_auth, i_auth2, i_auth_len) != 0) {
+ dpp_auth_fail(auth, "Mismatching Initiator Authenticating Tag");
+ goto fail;
+ }
+
+ bin_clear_free(unwrapped, unwrapped_len);
+ dpp_auth_success(auth);
+ return 0;
+fail:
+ bin_clear_free(unwrapped, unwrapped_len);
+ return -1;
+}
+
+
+void dpp_configuration_free(struct dpp_configuration *conf)
+{
+ if (!conf)
+ return;
+ str_clear_free(conf->passphrase);
+ os_free(conf->group_id);
+ bin_clear_free(conf, sizeof(*conf));
+}
+
+
+void dpp_auth_deinit(struct dpp_authentication *auth)
+{
+ if (!auth)
+ return;
+ dpp_configuration_free(auth->conf_ap);
+ dpp_configuration_free(auth->conf_sta);
+ EVP_PKEY_free(auth->own_protocol_key);
+ EVP_PKEY_free(auth->peer_protocol_key);
+ wpabuf_free(auth->req_msg);
+ wpabuf_free(auth->resp_msg);
+ wpabuf_free(auth->conf_req);
+ os_free(auth->connector);
+ wpabuf_free(auth->net_access_key);
+ wpabuf_free(auth->c_sign_key);
+ dpp_bootstrap_info_free(auth->tmp_own_bi);
+#ifdef CONFIG_TESTING_OPTIONS
+ os_free(auth->config_obj_override);
+ os_free(auth->discovery_override);
+ os_free(auth->groups_override);
+#endif /* CONFIG_TESTING_OPTIONS */
+ bin_clear_free(auth, sizeof(*auth));
+}
+
+
+static struct wpabuf *
+dpp_build_conf_start(struct dpp_authentication *auth,
+ struct dpp_configuration *conf, size_t tailroom)
+{
+ struct wpabuf *buf;
+ char ssid[6 * sizeof(conf->ssid) + 1];
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (auth->discovery_override)
+ tailroom += os_strlen(auth->discovery_override);
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ buf = wpabuf_alloc(200 + tailroom);
+ if (!buf)
+ return NULL;
+ wpabuf_put_str(buf, "{\"wi-fi_tech\":\"infra\",\"discovery\":");
+#ifdef CONFIG_TESTING_OPTIONS
+ if (auth->discovery_override) {
+ wpa_printf(MSG_DEBUG, "DPP: TESTING - discovery override: '%s'",
+ auth->discovery_override);
+ wpabuf_put_str(buf, auth->discovery_override);
+ wpabuf_put_u8(buf, ',');
+ return buf;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+ wpabuf_put_str(buf, "{\"ssid\":\"");
+ json_escape_string(ssid, sizeof(ssid),
+ (const char *) conf->ssid, conf->ssid_len);
+ wpabuf_put_str(buf, ssid);
+ wpabuf_put_str(buf, "\"},");
+
+ return buf;
+}
+
+
+static int dpp_build_jwk(struct wpabuf *buf, const char *name, EVP_PKEY *key,
+ const char *kid, const struct dpp_curve_params *curve)
+{
+ struct wpabuf *pub;
+ const u8 *pos;
+ char *x = NULL, *y = NULL;
+ int ret = -1;
+
+ pub = dpp_get_pubkey_point(key, 0);
+ if (!pub)
+ goto fail;
+ pos = wpabuf_head(pub);
+ x = (char *) base64_url_encode(pos, curve->prime_len, NULL, 0);
+ pos += curve->prime_len;
+ y = (char *) base64_url_encode(pos, curve->prime_len, NULL, 0);
+ if (!x || !y)
+ goto fail;
+
+ wpabuf_put_str(buf, "\"");
+ wpabuf_put_str(buf, name);
+ wpabuf_put_str(buf, "\":{\"kty\":\"EC\",\"crv\":\"");
+ wpabuf_put_str(buf, curve->jwk_crv);
+ wpabuf_put_str(buf, "\",\"x\":\"");
+ wpabuf_put_str(buf, x);
+ wpabuf_put_str(buf, "\",\"y\":\"");
+ wpabuf_put_str(buf, y);
+ if (kid) {
+ wpabuf_put_str(buf, "\",\"kid\":\"");
+ wpabuf_put_str(buf, kid);
+ }
+ wpabuf_put_str(buf, "\"}");
+ ret = 0;
+fail:
+ wpabuf_free(pub);
+ os_free(x);
+ os_free(y);
+ return ret;
+}
+
+
+static struct wpabuf *
+dpp_build_conf_obj_dpp(struct dpp_authentication *auth, int ap,
+ struct dpp_configuration *conf)
+{
+ struct wpabuf *buf = NULL;
+ char *signed1 = NULL, *signed2 = NULL, *signed3 = NULL;
+ size_t tailroom;
+ const struct dpp_curve_params *curve;
+ char jws_prot_hdr[100];
+ size_t signed1_len, signed2_len, signed3_len;
+ struct wpabuf *dppcon = NULL;
+ unsigned char *signature = NULL;
+ const unsigned char *p;
+ size_t signature_len;
+ EVP_MD_CTX *md_ctx = NULL;
+ ECDSA_SIG *sig = NULL;
+ char *dot = ".";
+ const EVP_MD *sign_md;
+ const BIGNUM *r, *s;
+ size_t extra_len = 1000;
+
+ if (!auth->conf) {
+ wpa_printf(MSG_INFO,
+ "DPP: No configurator specified - cannot generate DPP config object");
+ goto fail;
+ }
+ curve = auth->conf->curve;
+ if (curve->hash_len == SHA256_MAC_LEN) {
+ sign_md = EVP_sha256();
+ } else if (curve->hash_len == SHA384_MAC_LEN) {
+ sign_md = EVP_sha384();
+ } else if (curve->hash_len == SHA512_MAC_LEN) {
+ sign_md = EVP_sha512();
+ } else {
+ wpa_printf(MSG_DEBUG, "DPP: Unknown signature algorithm");
+ goto fail;
+ }
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (auth->groups_override)
+ extra_len += os_strlen(auth->groups_override);
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ if (conf->group_id)
+ extra_len += os_strlen(conf->group_id);
+
+ /* Connector (JSON dppCon object) */
+ dppcon = wpabuf_alloc(extra_len + 2 * auth->curve->prime_len * 4 / 3);
+ if (!dppcon)
+ goto fail;
+#ifdef CONFIG_TESTING_OPTIONS
+ if (auth->groups_override) {
+ wpabuf_put_u8(dppcon, '{');
+ if (auth->groups_override) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: TESTING - groups override: '%s'",
+ auth->groups_override);
+ wpabuf_put_str(dppcon, "\"groups\":");
+ wpabuf_put_str(dppcon, auth->groups_override);
+ wpabuf_put_u8(dppcon, ',');
+ }
+ goto skip_groups;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+ wpabuf_printf(dppcon, "{\"groups\":[{\"groupId\":\"%s\",",
+ conf->group_id ? conf->group_id : "*");
+ wpabuf_printf(dppcon, "\"netRole\":\"%s\"}],", ap ? "ap" : "sta");
+#ifdef CONFIG_TESTING_OPTIONS
+skip_groups:
+#endif /* CONFIG_TESTING_OPTIONS */
+ if (dpp_build_jwk(dppcon, "netAccessKey", auth->peer_protocol_key, NULL,
+ auth->curve) < 0) {
+ wpa_printf(MSG_DEBUG, "DPP: Failed to build netAccessKey JWK");
+ goto fail;
+ }
+ if (conf->netaccesskey_expiry) {
+ struct os_tm tm;
+
+ if (os_gmtime(conf->netaccesskey_expiry, &tm) < 0) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Failed to generate expiry string");
+ goto fail;
+ }
+ wpabuf_printf(dppcon,
+ ",\"expiry\":\"%04u-%02u-%02uT%02u:%02u:%02uZ\"",
+ tm.year, tm.month, tm.day,
+ tm.hour, tm.min, tm.sec);
+ }
+ wpabuf_put_u8(dppcon, '}');
+ wpa_printf(MSG_DEBUG, "DPP: dppCon: %s",
+ (const char *) wpabuf_head(dppcon));
+
+ os_snprintf(jws_prot_hdr, sizeof(jws_prot_hdr),
+ "{\"typ\":\"dppCon\",\"kid\":\"%s\",\"alg\":\"%s\"}",
+ auth->conf->kid, curve->jws_alg);
+ signed1 = (char *) base64_url_encode((unsigned char *) jws_prot_hdr,
+ os_strlen(jws_prot_hdr),
+ &signed1_len, 0);
+ signed2 = (char *) base64_url_encode(wpabuf_head(dppcon),
+ wpabuf_len(dppcon),
+ &signed2_len, 0);
+ if (!signed1 || !signed2)
+ goto fail;
+
+ md_ctx = EVP_MD_CTX_create();
+ if (!md_ctx)
+ goto fail;
+
+ ERR_clear_error();
+ if (EVP_DigestSignInit(md_ctx, NULL, sign_md, NULL,
+ auth->conf->csign) != 1) {
+ wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignInit failed: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+ if (EVP_DigestSignUpdate(md_ctx, signed1, signed1_len) != 1 ||
+ EVP_DigestSignUpdate(md_ctx, dot, 1) != 1 ||
+ EVP_DigestSignUpdate(md_ctx, signed2, signed2_len) != 1) {
+ wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignUpdate failed: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+ if (EVP_DigestSignFinal(md_ctx, NULL, &signature_len) != 1) {
+ wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignFinal failed: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+ signature = os_malloc(signature_len);
+ if (!signature)
+ goto fail;
+ if (EVP_DigestSignFinal(md_ctx, signature, &signature_len) != 1) {
+ wpa_printf(MSG_DEBUG, "DPP: EVP_DigestSignFinal failed: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: signedConnector ECDSA signature (DER)",
+ signature, signature_len);
+ /* Convert to raw coordinates r,s */
+ p = signature;
+ sig = d2i_ECDSA_SIG(NULL, &p, signature_len);
+ if (!sig)
+ goto fail;
+ ECDSA_SIG_get0(sig, &r, &s);
+ if (dpp_bn2bin_pad(r, signature, curve->prime_len) < 0 ||
+ dpp_bn2bin_pad(s, signature + curve->prime_len,
+ curve->prime_len) < 0)
+ goto fail;
+ signature_len = 2 * curve->prime_len;
+ wpa_hexdump(MSG_DEBUG, "DPP: signedConnector ECDSA signature (raw r,s)",
+ signature, signature_len);
+ signed3 = (char *) base64_url_encode(signature, signature_len,
+ &signed3_len, 0);
+ if (!signed3)
+ goto fail;
+
+ tailroom = 1000;
+ tailroom += 2 * curve->prime_len * 4 / 3 + os_strlen(auth->conf->kid);
+ tailroom += signed1_len + signed2_len + signed3_len;
+ buf = dpp_build_conf_start(auth, conf, tailroom);
+ if (!buf)
+ goto fail;
+
+ wpabuf_put_str(buf, "\"cred\":{\"akm\":\"dpp\",\"signedConnector\":\"");
+ wpabuf_put_str(buf, signed1);
+ wpabuf_put_u8(buf, '.');
+ wpabuf_put_str(buf, signed2);
+ wpabuf_put_u8(buf, '.');
+ wpabuf_put_str(buf, signed3);
+ wpabuf_put_str(buf, "\",");
+ if (dpp_build_jwk(buf, "csign", auth->conf->csign, auth->conf->kid,
+ curve) < 0) {
+ wpa_printf(MSG_DEBUG, "DPP: Failed to build csign JWK");
+ goto fail;
+ }
+
+ wpabuf_put_str(buf, "}}");
+
+ wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Configuration Object",
+ wpabuf_head(buf), wpabuf_len(buf));
+
+out:
+ EVP_MD_CTX_destroy(md_ctx);
+ ECDSA_SIG_free(sig);
+ os_free(signed1);
+ os_free(signed2);
+ os_free(signed3);
+ os_free(signature);
+ wpabuf_free(dppcon);
+ return buf;
+fail:
+ wpa_printf(MSG_DEBUG, "DPP: Failed to build configuration object");
+ wpabuf_free(buf);
+ buf = NULL;
+ goto out;
+}
+
+
+static struct wpabuf *
+dpp_build_conf_obj_legacy(struct dpp_authentication *auth, int ap,
+ struct dpp_configuration *conf)
+{
+ struct wpabuf *buf;
+
+ buf = dpp_build_conf_start(auth, conf, 1000);
+ if (!buf)
+ return NULL;
+
+ wpabuf_printf(buf, "\"cred\":{\"akm\":\"%s\",", dpp_akm_str(conf->akm));
+ if (conf->passphrase) {
+ char pass[63 * 6 + 1];
+
+ if (os_strlen(conf->passphrase) > 63) {
+ wpabuf_free(buf);
+ return NULL;
+ }
+
+ json_escape_string(pass, sizeof(pass), conf->passphrase,
+ os_strlen(conf->passphrase));
+ wpabuf_put_str(buf, "\"pass\":\"");
+ wpabuf_put_str(buf, pass);
+ wpabuf_put_str(buf, "\"");
+ } else {
+ char psk[2 * sizeof(conf->psk) + 1];
+
+ wpa_snprintf_hex(psk, sizeof(psk),
+ conf->psk, sizeof(conf->psk));
+ wpabuf_put_str(buf, "\"psk_hex\":\"");
+ wpabuf_put_str(buf, psk);
+ wpabuf_put_str(buf, "\"");
+ }
+ wpabuf_put_str(buf, "}}");
+
+ wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Configuration Object (legacy)",
+ wpabuf_head(buf), wpabuf_len(buf));
+
+ return buf;
+}
+
+
+static struct wpabuf *
+dpp_build_conf_obj(struct dpp_authentication *auth, int ap)
+{
+ struct dpp_configuration *conf;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (auth->config_obj_override) {
+ wpa_printf(MSG_DEBUG, "DPP: Testing - Config Object override");
+ return wpabuf_alloc_copy(auth->config_obj_override,
+ os_strlen(auth->config_obj_override));
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ conf = ap ? auth->conf_ap : auth->conf_sta;
+ if (!conf) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: No configuration available for Enrollee(%s) - reject configuration request",
+ ap ? "ap" : "sta");
+ return NULL;
+ }
+
+ if (conf->akm == DPP_AKM_DPP)
+ return dpp_build_conf_obj_dpp(auth, ap, conf);
+ return dpp_build_conf_obj_legacy(auth, ap, conf);
+}
+
+
+static struct wpabuf *
+dpp_build_conf_resp(struct dpp_authentication *auth, const u8 *e_nonce,
+ u16 e_nonce_len, int ap)
+{
+ struct wpabuf *conf;
+ size_t clear_len, attr_len;
+ struct wpabuf *clear = NULL, *msg = NULL;
+ u8 *wrapped;
+ const u8 *addr[1];
+ size_t len[1];
+ enum dpp_status_error status;
+
+ conf = dpp_build_conf_obj(auth, ap);
+ if (conf) {
+ wpa_hexdump_ascii(MSG_DEBUG, "DPP: configurationObject JSON",
+ wpabuf_head(conf), wpabuf_len(conf));
+ }
+ status = conf ? DPP_STATUS_OK : DPP_STATUS_CONFIGURE_FAILURE;
+
+ /* { E-nonce, configurationObject}ke */
+ clear_len = 4 + e_nonce_len;
+ if (conf)
+ clear_len += 4 + wpabuf_len(conf);
+ clear = wpabuf_alloc(clear_len);
+ attr_len = 4 + 1 + 4 + clear_len + AES_BLOCK_SIZE;
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_RESP)
+ attr_len += 5;
+#endif /* CONFIG_TESTING_OPTIONS */
+ msg = wpabuf_alloc(attr_len);
+ if (!clear || !msg)
+ goto fail;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_E_NONCE_CONF_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no E-nonce");
+ goto skip_e_nonce;
+ }
+ if (dpp_test == DPP_TEST_E_NONCE_MISMATCH_CONF_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - E-nonce mismatch");
+ wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
+ wpabuf_put_le16(clear, e_nonce_len);
+ wpabuf_put_data(clear, e_nonce, e_nonce_len - 1);
+ wpabuf_put_u8(clear, e_nonce[e_nonce_len - 1] ^ 0x01);
+ goto skip_e_nonce;
+ }
+ if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_CONF_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
+ goto skip_wrapped_data;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* E-nonce */
+ wpabuf_put_le16(clear, DPP_ATTR_ENROLLEE_NONCE);
+ wpabuf_put_le16(clear, e_nonce_len);
+ wpabuf_put_data(clear, e_nonce, e_nonce_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_e_nonce:
+ if (dpp_test == DPP_TEST_NO_CONFIG_OBJ_CONF_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - Config Object");
+ goto skip_config_obj;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ if (conf) {
+ wpabuf_put_le16(clear, DPP_ATTR_CONFIG_OBJ);
+ wpabuf_put_le16(clear, wpabuf_len(conf));
+ wpabuf_put_buf(clear, conf);
+ }
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_config_obj:
+ if (dpp_test == DPP_TEST_NO_STATUS_CONF_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - Status");
+ goto skip_status;
+ }
+ if (dpp_test == DPP_TEST_INVALID_STATUS_CONF_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
+ status = 255;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* DPP Status */
+ dpp_build_attr_status(msg, status);
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_status:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ addr[0] = wpabuf_head(msg);
+ len[0] = wpabuf_len(msg);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]);
+
+ wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
+ wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
+ wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
+
+ wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
+ if (aes_siv_encrypt(auth->ke, auth->curve->hash_len,
+ wpabuf_head(clear), wpabuf_len(clear),
+ 1, addr, len, wrapped) < 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_CONF_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
+ dpp_build_attr_status(msg, DPP_STATUS_OK);
+ }
+skip_wrapped_data:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ wpa_hexdump_buf(MSG_DEBUG,
+ "DPP: Configuration Response attributes", msg);
+out:
+ wpabuf_free(conf);
+ wpabuf_free(clear);
+
+ return msg;
+fail:
+ wpabuf_free(msg);
+ msg = NULL;
+ goto out;
+}
+
+
+struct wpabuf *
+dpp_conf_req_rx(struct dpp_authentication *auth, const u8 *attr_start,
+ size_t attr_len)
+{
+ const u8 *wrapped_data, *e_nonce, *config_attr;
+ u16 wrapped_data_len, e_nonce_len, config_attr_len;
+ u8 *unwrapped = NULL;
+ size_t unwrapped_len = 0;
+ struct wpabuf *resp = NULL;
+ struct json_token *root = NULL, *token;
+ int ap;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_STOP_AT_CONF_REQ) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - stop at Config Request");
+ return NULL;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ if (dpp_check_attrs(attr_start, attr_len) < 0) {
+ dpp_auth_fail(auth, "Invalid attribute in config request");
+ return NULL;
+ }
+
+ wrapped_data = dpp_get_attr(attr_start, attr_len, DPP_ATTR_WRAPPED_DATA,
+ &wrapped_data_len);
+ if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
+ dpp_auth_fail(auth,
+ "Missing or invalid required Wrapped Data attribute");
+ return NULL;
+ }
+
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped_data, wrapped_data_len);
+ unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
+ unwrapped = os_malloc(unwrapped_len);
+ if (!unwrapped)
+ return NULL;
+ if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
+ wrapped_data, wrapped_data_len,
+ 0, NULL, NULL, unwrapped) < 0) {
+ dpp_auth_fail(auth, "AES-SIV decryption failed");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
+ unwrapped, unwrapped_len);
+
+ if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
+ dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
+ goto fail;
+ }
+
+ e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
+ DPP_ATTR_ENROLLEE_NONCE,
+ &e_nonce_len);
+ if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
+ dpp_auth_fail(auth,
+ "Missing or invalid Enrollee Nonce attribute");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
+
+ config_attr = dpp_get_attr(unwrapped, unwrapped_len,
+ DPP_ATTR_CONFIG_ATTR_OBJ,
+ &config_attr_len);
+ if (!config_attr) {
+ dpp_auth_fail(auth,
+ "Missing or invalid Config Attributes attribute");
+ goto fail;
+ }
+ wpa_hexdump_ascii(MSG_DEBUG, "DPP: Config Attributes",
+ config_attr, config_attr_len);
+
+ root = json_parse((const char *) config_attr, config_attr_len);
+ if (!root) {
+ dpp_auth_fail(auth, "Could not parse Config Attributes");
+ goto fail;
+ }
+
+ token = json_get_member(root, "name");
+ if (!token || token->type != JSON_STRING) {
+ dpp_auth_fail(auth, "No Config Attributes - name");
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: Enrollee name = '%s'", token->string);
+
+ token = json_get_member(root, "wi-fi_tech");
+ if (!token || token->type != JSON_STRING) {
+ dpp_auth_fail(auth, "No Config Attributes - wi-fi_tech");
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: wi-fi_tech = '%s'", token->string);
+ if (os_strcmp(token->string, "infra") != 0) {
+ wpa_printf(MSG_DEBUG, "DPP: Unsupported wi-fi_tech '%s'",
+ token->string);
+ dpp_auth_fail(auth, "Unsupported wi-fi_tech");
+ goto fail;
+ }
+
+ token = json_get_member(root, "netRole");
+ if (!token || token->type != JSON_STRING) {
+ dpp_auth_fail(auth, "No Config Attributes - netRole");
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: netRole = '%s'", token->string);
+ if (os_strcmp(token->string, "sta") == 0) {
+ ap = 0;
+ } else if (os_strcmp(token->string, "ap") == 0) {
+ ap = 1;
+ } else {
+ wpa_printf(MSG_DEBUG, "DPP: Unsupported netRole '%s'",
+ token->string);
+ dpp_auth_fail(auth, "Unsupported netRole");
+ goto fail;
+ }
+
+ resp = dpp_build_conf_resp(auth, e_nonce, e_nonce_len, ap);
+
+fail:
+ json_free(root);
+ os_free(unwrapped);
+ return resp;
+}
+
+
+static struct wpabuf *
+dpp_parse_jws_prot_hdr(const struct dpp_curve_params *curve,
+ const u8 *prot_hdr, u16 prot_hdr_len,
+ const EVP_MD **ret_md)
+{
+ struct json_token *root, *token;
+ struct wpabuf *kid = NULL;
+
+ root = json_parse((const char *) prot_hdr, prot_hdr_len);
+ if (!root) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: JSON parsing failed for JWS Protected Header");
+ goto fail;
+ }
+
+ if (root->type != JSON_OBJECT) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: JWS Protected Header root is not an object");
+ goto fail;
+ }
+
+ token = json_get_member(root, "typ");
+ if (!token || token->type != JSON_STRING) {
+ wpa_printf(MSG_DEBUG, "DPP: No typ string value found");
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: JWS Protected Header typ=%s",
+ token->string);
+ if (os_strcmp(token->string, "dppCon") != 0) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unsupported JWS Protected Header typ=%s",
+ token->string);
+ goto fail;
+ }
+
+ token = json_get_member(root, "alg");
+ if (!token || token->type != JSON_STRING) {
+ wpa_printf(MSG_DEBUG, "DPP: No alg string value found");
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: JWS Protected Header alg=%s",
+ token->string);
+ if (os_strcmp(token->string, curve->jws_alg) != 0) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unexpected JWS Protected Header alg=%s (expected %s based on C-sign-key)",
+ token->string, curve->jws_alg);
+ goto fail;
+ }
+ if (os_strcmp(token->string, "ES256") == 0 ||
+ os_strcmp(token->string, "BS256") == 0)
+ *ret_md = EVP_sha256();
+ else if (os_strcmp(token->string, "ES384") == 0 ||
+ os_strcmp(token->string, "BS384") == 0)
+ *ret_md = EVP_sha384();
+ else if (os_strcmp(token->string, "ES512") == 0 ||
+ os_strcmp(token->string, "BS512") == 0)
+ *ret_md = EVP_sha512();
+ else
+ *ret_md = NULL;
+ if (!*ret_md) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unsupported JWS Protected Header alg=%s",
+ token->string);
+ goto fail;
+ }
+
+ kid = json_get_member_base64url(root, "kid");
+ if (!kid) {
+ wpa_printf(MSG_DEBUG, "DPP: No kid string value found");
+ goto fail;
+ }
+ wpa_hexdump_buf(MSG_DEBUG, "DPP: JWS Protected Header kid (decoded)",
+ kid);
+
+fail:
+ json_free(root);
+ return kid;
+}
+
+
+static int dpp_parse_cred_legacy(struct dpp_authentication *auth,
+ struct json_token *cred)
+{
+ struct json_token *pass, *psk_hex;
+
+ wpa_printf(MSG_DEBUG, "DPP: Legacy akm=psk credential");
+
+ pass = json_get_member(cred, "pass");
+ psk_hex = json_get_member(cred, "psk_hex");
+
+ if (pass && pass->type == JSON_STRING) {
+ size_t len = os_strlen(pass->string);
+
+ wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: Legacy passphrase",
+ pass->string, len);
+ if (len < 8 || len > 63)
+ return -1;
+ os_strlcpy(auth->passphrase, pass->string,
+ sizeof(auth->passphrase));
+ } else if (psk_hex && psk_hex->type == JSON_STRING) {
+ if (auth->akm == DPP_AKM_SAE) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unexpected psk_hex with akm=sae");
+ return -1;
+ }
+ if (os_strlen(psk_hex->string) != PMK_LEN * 2 ||
+ hexstr2bin(psk_hex->string, auth->psk, PMK_LEN) < 0) {
+ wpa_printf(MSG_DEBUG, "DPP: Invalid psk_hex encoding");
+ return -1;
+ }
+ wpa_hexdump_key(MSG_DEBUG, "DPP: Legacy PSK",
+ auth->psk, PMK_LEN);
+ auth->psk_set = 1;
+ } else {
+ wpa_printf(MSG_DEBUG, "DPP: No pass or psk_hex strings found");
+ return -1;
+ }
+
+ if ((auth->akm == DPP_AKM_SAE || auth->akm == DPP_AKM_PSK_SAE) &&
+ !auth->passphrase[0]) {
+ wpa_printf(MSG_DEBUG, "DPP: No pass for sae found");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static EVP_PKEY * dpp_parse_jwk(struct json_token *jwk,
+ const struct dpp_curve_params **key_curve)
+{
+ struct json_token *token;
+ const struct dpp_curve_params *curve;
+ struct wpabuf *x = NULL, *y = NULL;
+ EC_GROUP *group;
+ EVP_PKEY *pkey = NULL;
+
+ token = json_get_member(jwk, "kty");
+ if (!token || token->type != JSON_STRING) {
+ wpa_printf(MSG_DEBUG, "DPP: No kty in JWK");
+ goto fail;
+ }
+ if (os_strcmp(token->string, "EC") != 0) {
+ wpa_printf(MSG_DEBUG, "DPP: Unexpected JWK kty '%s'",
+ token->string);
+ goto fail;
+ }
+
+ token = json_get_member(jwk, "crv");
+ if (!token || token->type != JSON_STRING) {
+ wpa_printf(MSG_DEBUG, "DPP: No crv in JWK");
+ goto fail;
+ }
+ curve = dpp_get_curve_jwk_crv(token->string);
+ if (!curve) {
+ wpa_printf(MSG_DEBUG, "DPP: Unsupported JWK crv '%s'",
+ token->string);
+ goto fail;
+ }
+
+ x = json_get_member_base64url(jwk, "x");
+ if (!x) {
+ wpa_printf(MSG_DEBUG, "DPP: No x in JWK");
+ goto fail;
+ }
+ wpa_hexdump_buf(MSG_DEBUG, "DPP: JWK x", x);
+ if (wpabuf_len(x) != curve->prime_len) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unexpected JWK x length %u (expected %u for curve %s)",
+ (unsigned int) wpabuf_len(x),
+ (unsigned int) curve->prime_len, curve->name);
+ goto fail;
+ }
+
+ y = json_get_member_base64url(jwk, "y");
+ if (!y) {
+ wpa_printf(MSG_DEBUG, "DPP: No y in JWK");
+ goto fail;
+ }
+ wpa_hexdump_buf(MSG_DEBUG, "DPP: JWK y", y);
+ if (wpabuf_len(y) != curve->prime_len) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unexpected JWK y length %u (expected %u for curve %s)",
+ (unsigned int) wpabuf_len(y),
+ (unsigned int) curve->prime_len, curve->name);
+ goto fail;
+ }
+
+ group = EC_GROUP_new_by_curve_name(OBJ_txt2nid(curve->name));
+ if (!group) {
+ wpa_printf(MSG_DEBUG, "DPP: Could not prepare group for JWK");
+ goto fail;
+ }
+
+ pkey = dpp_set_pubkey_point_group(group, wpabuf_head(x), wpabuf_head(y),
+ wpabuf_len(x));
+ *key_curve = curve;
+
+fail:
+ wpabuf_free(x);
+ wpabuf_free(y);
+
+ return pkey;
+}
+
+
+int dpp_key_expired(const char *timestamp, os_time_t *expiry)
+{
+ struct os_time now;
+ unsigned int year, month, day, hour, min, sec;
+ os_time_t utime;
+ const char *pos;
+
+ /* ISO 8601 date and time:
+ * <date>T<time>
+ * YYYY-MM-DDTHH:MM:SSZ
+ * YYYY-MM-DDTHH:MM:SS+03:00
+ */
+ if (os_strlen(timestamp) < 19) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Too short timestamp - assume expired key");
+ return 1;
+ }
+ if (sscanf(timestamp, "%04u-%02u-%02uT%02u:%02u:%02u",
+ &year, &month, &day, &hour, &min, &sec) != 6) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Failed to parse expiration day - assume expired key");
+ return 1;
+ }
+
+ if (os_mktime(year, month, day, hour, min, sec, &utime) < 0) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Invalid date/time information - assume expired key");
+ return 1;
+ }
+
+ pos = timestamp + 19;
+ if (*pos == 'Z' || *pos == '\0') {
+ /* In UTC - no need to adjust */
+ } else if (*pos == '-' || *pos == '+') {
+ int items;
+
+ /* Adjust local time to UTC */
+ items = sscanf(pos + 1, "%02u:%02u", &hour, &min);
+ if (items < 1) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Invalid time zone designator (%s) - assume expired key",
+ pos);
+ return 1;
+ }
+ if (*pos == '-')
+ utime += 3600 * hour;
+ if (*pos == '+')
+ utime -= 3600 * hour;
+ if (items > 1) {
+ if (*pos == '-')
+ utime += 60 * min;
+ if (*pos == '+')
+ utime -= 60 * min;
+ }
+ } else {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Invalid time zone designator (%s) - assume expired key",
+ pos);
+ return 1;
+ }
+ if (expiry)
+ *expiry = utime;
+
+ if (os_get_time(&now) < 0) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Cannot get current time - assume expired key");
+ return 1;
+ }
+
+ if (now.sec > utime) {
+ wpa_printf(MSG_DEBUG, "DPP: Key has expired (%lu < %lu)",
+ utime, now.sec);
+ return 1;
+ }
+
+ return 0;
+}
+
+
+static int dpp_parse_connector(struct dpp_authentication *auth,
+ const unsigned char *payload,
+ u16 payload_len)
+{
+ struct json_token *root, *groups, *netkey, *token;
+ int ret = -1;
+ EVP_PKEY *key = NULL;
+ const struct dpp_curve_params *curve;
+ unsigned int rules = 0;
+
+ root = json_parse((const char *) payload, payload_len);
+ if (!root) {
+ wpa_printf(MSG_DEBUG, "DPP: JSON parsing of connector failed");
+ goto fail;
+ }
+
+ groups = json_get_member(root, "groups");
+ if (!groups || groups->type != JSON_ARRAY) {
+ wpa_printf(MSG_DEBUG, "DPP: No groups array found");
+ goto skip_groups;
+ }
+ for (token = groups->child; token; token = token->sibling) {
+ struct json_token *id, *role;
+
+ id = json_get_member(token, "groupId");
+ if (!id || id->type != JSON_STRING) {
+ wpa_printf(MSG_DEBUG, "DPP: Missing groupId string");
+ goto fail;
+ }
+
+ role = json_get_member(token, "netRole");
+ if (!role || role->type != JSON_STRING) {
+ wpa_printf(MSG_DEBUG, "DPP: Missing netRole string");
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG,
+ "DPP: connector group: groupId='%s' netRole='%s'",
+ id->string, role->string);
+ rules++;
+ }
+skip_groups:
+
+ if (!rules) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Connector includes no groups");
+ goto fail;
+ }
+
+ token = json_get_member(root, "expiry");
+ if (!token || token->type != JSON_STRING) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: No expiry string found - connector does not expire");
+ } else {
+ wpa_printf(MSG_DEBUG, "DPP: expiry = %s", token->string);
+ if (dpp_key_expired(token->string,
+ &auth->net_access_key_expiry)) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Connector (netAccessKey) has expired");
+ goto fail;
+ }
+ }
+
+ netkey = json_get_member(root, "netAccessKey");
+ if (!netkey || netkey->type != JSON_OBJECT) {
+ wpa_printf(MSG_DEBUG, "DPP: No netAccessKey object found");
+ goto fail;
+ }
+
+ key = dpp_parse_jwk(netkey, &curve);
+ if (!key)
+ goto fail;
+ dpp_debug_print_key("DPP: Received netAccessKey", key);
+
+ if (EVP_PKEY_cmp(key, auth->own_protocol_key) != 1) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: netAccessKey in connector does not match own protocol key");
+#ifdef CONFIG_TESTING_OPTIONS
+ if (auth->ignore_netaccesskey_mismatch) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: TESTING - skip netAccessKey mismatch");
+ } else {
+ goto fail;
+ }
+#else /* CONFIG_TESTING_OPTIONS */
+ goto fail;
+#endif /* CONFIG_TESTING_OPTIONS */
+ }
+
+ ret = 0;
+fail:
+ EVP_PKEY_free(key);
+ json_free(root);
+ return ret;
+}
+
+
+static int dpp_check_pubkey_match(EVP_PKEY *pub, struct wpabuf *r_hash)
+{
+ struct wpabuf *uncomp;
+ int res;
+ u8 hash[SHA256_MAC_LEN];
+ const u8 *addr[1];
+ size_t len[1];
+
+ if (wpabuf_len(r_hash) != SHA256_MAC_LEN)
+ return -1;
+ uncomp = dpp_get_pubkey_point(pub, 1);
+ if (!uncomp)
+ return -1;
+ addr[0] = wpabuf_head(uncomp);
+ len[0] = wpabuf_len(uncomp);
+ wpa_hexdump(MSG_DEBUG, "DPP: Uncompressed public key",
+ addr[0], len[0]);
+ res = sha256_vector(1, addr, len, hash);
+ wpabuf_free(uncomp);
+ if (res < 0)
+ return -1;
+ if (os_memcmp(hash, wpabuf_head(r_hash), SHA256_MAC_LEN) != 0) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Received hash value does not match calculated public key hash value");
+ wpa_hexdump(MSG_DEBUG, "DPP: Calculated hash",
+ hash, SHA256_MAC_LEN);
+ return -1;
+ }
+ return 0;
+}
+
+
+static void dpp_copy_csign(struct dpp_authentication *auth, EVP_PKEY *csign)
+{
+ unsigned char *der = NULL;
+ int der_len;
+
+ der_len = i2d_PUBKEY(csign, &der);
+ if (der_len <= 0)
+ return;
+ wpabuf_free(auth->c_sign_key);
+ auth->c_sign_key = wpabuf_alloc_copy(der, der_len);
+ OPENSSL_free(der);
+}
+
+
+static void dpp_copy_netaccesskey(struct dpp_authentication *auth)
+{
+ unsigned char *der = NULL;
+ int der_len;
+ EC_KEY *eckey;
+
+ eckey = EVP_PKEY_get1_EC_KEY(auth->own_protocol_key);
+ if (!eckey)
+ return;
+
+ der_len = i2d_ECPrivateKey(eckey, &der);
+ if (der_len <= 0) {
+ EC_KEY_free(eckey);
+ return;
+ }
+ wpabuf_free(auth->net_access_key);
+ auth->net_access_key = wpabuf_alloc_copy(der, der_len);
+ OPENSSL_free(der);
+ EC_KEY_free(eckey);
+}
+
+
+struct dpp_signed_connector_info {
+ unsigned char *payload;
+ size_t payload_len;
+};
+
+static enum dpp_status_error
+dpp_process_signed_connector(struct dpp_signed_connector_info *info,
+ EVP_PKEY *csign_pub, const char *connector)
+{
+ enum dpp_status_error ret = 255;
+ const char *pos, *end, *signed_start, *signed_end;
+ struct wpabuf *kid = NULL;
+ unsigned char *prot_hdr = NULL, *signature = NULL;
+ size_t prot_hdr_len = 0, signature_len = 0;
+ const EVP_MD *sign_md = NULL;
+ unsigned char *der = NULL;
+ int der_len;
+ int res;
+ EVP_MD_CTX *md_ctx = NULL;
+ ECDSA_SIG *sig = NULL;
+ BIGNUM *r = NULL, *s = NULL;
+ const struct dpp_curve_params *curve;
+ EC_KEY *eckey;
+ const EC_GROUP *group;
+ int nid;
+
+ eckey = EVP_PKEY_get1_EC_KEY(csign_pub);
+ if (!eckey)
+ goto fail;
+ group = EC_KEY_get0_group(eckey);
+ if (!group)
+ goto fail;
+ nid = EC_GROUP_get_curve_name(group);
+ curve = dpp_get_curve_nid(nid);
+ if (!curve)
+ goto fail;
+ wpa_printf(MSG_DEBUG, "DPP: C-sign-key group: %s", curve->jwk_crv);
+ os_memset(info, 0, sizeof(*info));
+
+ signed_start = pos = connector;
+ end = os_strchr(pos, '.');
+ if (!end) {
+ wpa_printf(MSG_DEBUG, "DPP: Missing dot(1) in signedConnector");
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+ prot_hdr = base64_url_decode((const unsigned char *) pos,
+ end - pos, &prot_hdr_len);
+ if (!prot_hdr) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Failed to base64url decode signedConnector JWS Protected Header");
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+ wpa_hexdump_ascii(MSG_DEBUG,
+ "DPP: signedConnector - JWS Protected Header",
+ prot_hdr, prot_hdr_len);
+ kid = dpp_parse_jws_prot_hdr(curve, prot_hdr, prot_hdr_len, &sign_md);
+ if (!kid) {
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+ if (wpabuf_len(kid) != SHA256_MAC_LEN) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unexpected signedConnector JWS Protected Header kid length: %u (expected %u)",
+ (unsigned int) wpabuf_len(kid), SHA256_MAC_LEN);
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+
+ pos = end + 1;
+ end = os_strchr(pos, '.');
+ if (!end) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Missing dot(2) in signedConnector");
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+ signed_end = end - 1;
+ info->payload = base64_url_decode((const unsigned char *) pos,
+ end - pos, &info->payload_len);
+ if (!info->payload) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Failed to base64url decode signedConnector JWS Payload");
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+ wpa_hexdump_ascii(MSG_DEBUG,
+ "DPP: signedConnector - JWS Payload",
+ info->payload, info->payload_len);
+ pos = end + 1;
+ signature = base64_url_decode((const unsigned char *) pos,
+ os_strlen(pos), &signature_len);
+ if (!signature) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Failed to base64url decode signedConnector signature");
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: signedConnector - signature",
+ signature, signature_len);
+
+ if (dpp_check_pubkey_match(csign_pub, kid) < 0) {
+ ret = DPP_STATUS_NO_MATCH;
+ goto fail;
+ }
+
+ if (signature_len & 0x01) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unexpected signedConnector signature length (%d)",
+ (int) signature_len);
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+
+ /* JWS Signature encodes the signature (r,s) as two octet strings. Need
+ * to convert that to DER encoded ECDSA_SIG for OpenSSL EVP routines. */
+ r = BN_bin2bn(signature, signature_len / 2, NULL);
+ s = BN_bin2bn(signature + signature_len / 2, signature_len / 2, NULL);
+ sig = ECDSA_SIG_new();
+ if (!r || !s || !sig || ECDSA_SIG_set0(sig, r, s) != 1)
+ goto fail;
+ r = NULL;
+ s = NULL;
+
+ der_len = i2d_ECDSA_SIG(sig, &der);
+ if (der_len <= 0) {
+ wpa_printf(MSG_DEBUG, "DPP: Could not DER encode signature");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: DER encoded signature", der, der_len);
+ md_ctx = EVP_MD_CTX_create();
+ if (!md_ctx)
+ goto fail;
+
+ ERR_clear_error();
+ if (EVP_DigestVerifyInit(md_ctx, NULL, sign_md, NULL, csign_pub) != 1) {
+ wpa_printf(MSG_DEBUG, "DPP: EVP_DigestVerifyInit failed: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+ if (EVP_DigestVerifyUpdate(md_ctx, signed_start,
+ signed_end - signed_start + 1) != 1) {
+ wpa_printf(MSG_DEBUG, "DPP: EVP_DigestVerifyUpdate failed: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+ res = EVP_DigestVerifyFinal(md_ctx, der, der_len);
+ if (res != 1) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: EVP_DigestVerifyFinal failed (res=%d): %s",
+ res, ERR_error_string(ERR_get_error(), NULL));
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+
+ ret = DPP_STATUS_OK;
+fail:
+ EC_KEY_free(eckey);
+ EVP_MD_CTX_destroy(md_ctx);
+ os_free(prot_hdr);
+ wpabuf_free(kid);
+ os_free(signature);
+ ECDSA_SIG_free(sig);
+ BN_free(r);
+ BN_free(s);
+ OPENSSL_free(der);
+ return ret;
+}
+
+
+static int dpp_parse_cred_dpp(struct dpp_authentication *auth,
+ struct json_token *cred)
+{
+ struct dpp_signed_connector_info info;
+ struct json_token *token, *csign;
+ int ret = -1;
+ EVP_PKEY *csign_pub = NULL;
+ const struct dpp_curve_params *key_curve = NULL;
+ const char *signed_connector;
+
+ os_memset(&info, 0, sizeof(info));
+
+ wpa_printf(MSG_DEBUG, "DPP: Connector credential");
+
+ csign = json_get_member(cred, "csign");
+ if (!csign || csign->type != JSON_OBJECT) {
+ wpa_printf(MSG_DEBUG, "DPP: No csign JWK in JSON");
+ goto fail;
+ }
+
+ csign_pub = dpp_parse_jwk(csign, &key_curve);
+ if (!csign_pub) {
+ wpa_printf(MSG_DEBUG, "DPP: Failed to parse csign JWK");
+ goto fail;
+ }
+ dpp_debug_print_key("DPP: Received C-sign-key", csign_pub);
+
+ token = json_get_member(cred, "signedConnector");
+ if (!token || token->type != JSON_STRING) {
+ wpa_printf(MSG_DEBUG, "DPP: No signedConnector string found");
+ goto fail;
+ }
+ wpa_hexdump_ascii(MSG_DEBUG, "DPP: signedConnector",
+ token->string, os_strlen(token->string));
+ signed_connector = token->string;
+
+ if (os_strchr(signed_connector, '"') ||
+ os_strchr(signed_connector, '\n')) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Unexpected character in signedConnector");
+ goto fail;
+ }
+
+ if (dpp_process_signed_connector(&info, csign_pub,
+ signed_connector) != DPP_STATUS_OK)
+ goto fail;
+
+ if (dpp_parse_connector(auth, info.payload, info.payload_len) < 0) {
+ wpa_printf(MSG_DEBUG, "DPP: Failed to parse connector");
+ goto fail;
+ }
+
+ os_free(auth->connector);
+ auth->connector = os_strdup(signed_connector);
+
+ dpp_copy_csign(auth, csign_pub);
+ dpp_copy_netaccesskey(auth);
+
+ ret = 0;
+fail:
+ EVP_PKEY_free(csign_pub);
+ os_free(info.payload);
+ return ret;
+}
+
+
+const char * dpp_akm_str(enum dpp_akm akm)
+{
+ switch (akm) {
+ case DPP_AKM_DPP:
+ return "dpp";
+ case DPP_AKM_PSK:
+ return "psk";
+ case DPP_AKM_SAE:
+ return "sae";
+ case DPP_AKM_PSK_SAE:
+ return "psk+sae";
+ default:
+ return "??";
+ }
+}
+
+
+static enum dpp_akm dpp_akm_from_str(const char *akm)
+{
+ if (os_strcmp(akm, "psk") == 0)
+ return DPP_AKM_PSK;
+ if (os_strcmp(akm, "sae") == 0)
+ return DPP_AKM_SAE;
+ if (os_strcmp(akm, "psk+sae") == 0)
+ return DPP_AKM_PSK_SAE;
+ if (os_strcmp(akm, "dpp") == 0)
+ return DPP_AKM_DPP;
+ return DPP_AKM_UNKNOWN;
+}
+
+
+static int dpp_parse_conf_obj(struct dpp_authentication *auth,
+ const u8 *conf_obj, u16 conf_obj_len)
+{
+ int ret = -1;
+ struct json_token *root, *token, *discovery, *cred;
+
+ root = json_parse((const char *) conf_obj, conf_obj_len);
+ if (!root)
+ return -1;
+ if (root->type != JSON_OBJECT) {
+ dpp_auth_fail(auth, "JSON root is not an object");
+ goto fail;
+ }
+
+ token = json_get_member(root, "wi-fi_tech");
+ if (!token || token->type != JSON_STRING) {
+ dpp_auth_fail(auth, "No wi-fi_tech string value found");
+ goto fail;
+ }
+ if (os_strcmp(token->string, "infra") != 0) {
+ wpa_printf(MSG_DEBUG, "DPP: Unsupported wi-fi_tech value: '%s'",
+ token->string);
+ dpp_auth_fail(auth, "Unsupported wi-fi_tech value");
+ goto fail;
+ }
+
+ discovery = json_get_member(root, "discovery");
+ if (!discovery || discovery->type != JSON_OBJECT) {
+ dpp_auth_fail(auth, "No discovery object in JSON");
+ goto fail;
+ }
+
+ token = json_get_member(discovery, "ssid");
+ if (!token || token->type != JSON_STRING) {
+ dpp_auth_fail(auth, "No discovery::ssid string value found");
+ goto fail;
+ }
+ wpa_hexdump_ascii(MSG_DEBUG, "DPP: discovery::ssid",
+ token->string, os_strlen(token->string));
+ if (os_strlen(token->string) > SSID_MAX_LEN) {
+ dpp_auth_fail(auth, "Too long discovery::ssid string value");
+ goto fail;
+ }
+ auth->ssid_len = os_strlen(token->string);
+ os_memcpy(auth->ssid, token->string, auth->ssid_len);
+
+ cred = json_get_member(root, "cred");
+ if (!cred || cred->type != JSON_OBJECT) {
+ dpp_auth_fail(auth, "No cred object in JSON");
+ goto fail;
+ }
+
+ token = json_get_member(cred, "akm");
+ if (!token || token->type != JSON_STRING) {
+ dpp_auth_fail(auth, "No cred::akm string value found");
+ goto fail;
+ }
+ auth->akm = dpp_akm_from_str(token->string);
+
+ if (auth->akm == DPP_AKM_PSK || auth->akm == DPP_AKM_SAE ||
+ auth->akm == DPP_AKM_PSK_SAE) {
+ if (dpp_parse_cred_legacy(auth, cred) < 0)
+ goto fail;
+ } else if (auth->akm == DPP_AKM_DPP) {
+ if (dpp_parse_cred_dpp(auth, cred) < 0)
+ goto fail;
+ } else {
+ wpa_printf(MSG_DEBUG, "DPP: Unsupported akm: %s",
+ token->string);
+ dpp_auth_fail(auth, "Unsupported akm");
+ goto fail;
+ }
+
+ wpa_printf(MSG_DEBUG, "DPP: JSON parsing completed successfully");
+ ret = 0;
+fail:
+ json_free(root);
+ return ret;
+}
+
+
+int dpp_conf_resp_rx(struct dpp_authentication *auth,
+ const struct wpabuf *resp)
+{
+ const u8 *wrapped_data, *e_nonce, *status, *conf_obj;
+ u16 wrapped_data_len, e_nonce_len, status_len, conf_obj_len;
+ const u8 *addr[1];
+ size_t len[1];
+ u8 *unwrapped = NULL;
+ size_t unwrapped_len = 0;
+ int ret = -1;
+
+ if (dpp_check_attrs(wpabuf_head(resp), wpabuf_len(resp)) < 0) {
+ dpp_auth_fail(auth, "Invalid attribute in config response");
+ return -1;
+ }
+
+ wrapped_data = dpp_get_attr(wpabuf_head(resp), wpabuf_len(resp),
+ DPP_ATTR_WRAPPED_DATA,
+ &wrapped_data_len);
+ if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
+ dpp_auth_fail(auth,
+ "Missing or invalid required Wrapped Data attribute");
+ return -1;
+ }
+
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped_data, wrapped_data_len);
+ unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
+ unwrapped = os_malloc(unwrapped_len);
+ if (!unwrapped)
+ return -1;
+
+ addr[0] = wpabuf_head(resp);
+ len[0] = wrapped_data - 4 - (const u8 *) wpabuf_head(resp);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD", addr[0], len[0]);
+
+ if (aes_siv_decrypt(auth->ke, auth->curve->hash_len,
+ wrapped_data, wrapped_data_len,
+ 1, addr, len, unwrapped) < 0) {
+ dpp_auth_fail(auth, "AES-SIV decryption failed");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
+ unwrapped, unwrapped_len);
+
+ if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
+ dpp_auth_fail(auth, "Invalid attribute in unwrapped data");
+ goto fail;
+ }
+
+ e_nonce = dpp_get_attr(unwrapped, unwrapped_len,
+ DPP_ATTR_ENROLLEE_NONCE,
+ &e_nonce_len);
+ if (!e_nonce || e_nonce_len != auth->curve->nonce_len) {
+ dpp_auth_fail(auth,
+ "Missing or invalid Enrollee Nonce attribute");
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: Enrollee Nonce", e_nonce, e_nonce_len);
+ if (os_memcmp(e_nonce, auth->e_nonce, e_nonce_len) != 0) {
+ dpp_auth_fail(auth, "Enrollee Nonce mismatch");
+ goto fail;
+ }
+
+ status = dpp_get_attr(wpabuf_head(resp), wpabuf_len(resp),
+ DPP_ATTR_STATUS, &status_len);
+ if (!status || status_len < 1) {
+ dpp_auth_fail(auth,
+ "Missing or invalid required DPP Status attribute");
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: Status %u", status[0]);
+ if (status[0] != DPP_STATUS_OK) {
+ dpp_auth_fail(auth, "Configurator rejected configuration");
+ goto fail;
+ }
+
+ conf_obj = dpp_get_attr(unwrapped, unwrapped_len,
+ DPP_ATTR_CONFIG_OBJ, &conf_obj_len);
+ if (!conf_obj) {
+ dpp_auth_fail(auth,
+ "Missing required Configuration Object attribute");
+ goto fail;
+ }
+ wpa_hexdump_ascii(MSG_DEBUG, "DPP: configurationObject JSON",
+ conf_obj, conf_obj_len);
+ if (dpp_parse_conf_obj(auth, conf_obj, conf_obj_len) < 0)
+ goto fail;
+
+ ret = 0;
+
+fail:
+ os_free(unwrapped);
+ return ret;
+}
+
+
+void dpp_configurator_free(struct dpp_configurator *conf)
+{
+ if (!conf)
+ return;
+ EVP_PKEY_free(conf->csign);
+ os_free(conf->kid);
+ os_free(conf);
+}
+
+
+int dpp_configurator_get_key(const struct dpp_configurator *conf, char *buf,
+ size_t buflen)
+{
+ EC_KEY *eckey;
+ int key_len, ret = -1;
+ unsigned char *key = NULL;
+
+ if (!conf->csign)
+ return -1;
+
+ eckey = EVP_PKEY_get1_EC_KEY(conf->csign);
+ if (!eckey)
+ return -1;
+
+ key_len = i2d_ECPrivateKey(eckey, &key);
+ if (key_len > 0)
+ ret = wpa_snprintf_hex(buf, buflen, key, key_len);
+
+ EC_KEY_free(eckey);
+ OPENSSL_free(key);
+ return ret;
+}
+
+
+struct dpp_configurator *
+dpp_keygen_configurator(const char *curve, const u8 *privkey,
+ size_t privkey_len)
+{
+ struct dpp_configurator *conf;
+ struct wpabuf *csign_pub = NULL;
+ u8 kid_hash[SHA256_MAC_LEN];
+ const u8 *addr[1];
+ size_t len[1];
+
+ conf = os_zalloc(sizeof(*conf));
+ if (!conf)
+ return NULL;
+
+ if (!curve) {
+ conf->curve = &dpp_curves[0];
+ } else {
+ conf->curve = dpp_get_curve_name(curve);
+ if (!conf->curve) {
+ wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s",
+ curve);
+ os_free(conf);
+ return NULL;
+ }
+ }
+ if (privkey)
+ conf->csign = dpp_set_keypair(&conf->curve, privkey,
+ privkey_len);
+ else
+ conf->csign = dpp_gen_keypair(conf->curve);
+ if (!conf->csign)
+ goto fail;
+ conf->own = 1;
+
+ csign_pub = dpp_get_pubkey_point(conf->csign, 1);
+ if (!csign_pub) {
+ wpa_printf(MSG_INFO, "DPP: Failed to extract C-sign-key");
+ goto fail;
+ }
+
+ /* kid = SHA256(ANSI X9.63 uncompressed C-sign-key) */
+ addr[0] = wpabuf_head(csign_pub);
+ len[0] = wpabuf_len(csign_pub);
+ if (sha256_vector(1, addr, len, kid_hash) < 0) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Failed to derive kid for C-sign-key");
+ goto fail;
+ }
+
+ conf->kid = (char *) base64_url_encode(kid_hash, sizeof(kid_hash),
+ NULL, 0);
+ if (!conf->kid)
+ goto fail;
+out:
+ wpabuf_free(csign_pub);
+ return conf;
+fail:
+ dpp_configurator_free(conf);
+ conf = NULL;
+ goto out;
+}
+
+
+int dpp_configurator_own_config(struct dpp_authentication *auth,
+ const char *curve, int ap)
+{
+ struct wpabuf *conf_obj;
+ int ret = -1;
+
+ if (!auth->conf) {
+ wpa_printf(MSG_DEBUG, "DPP: No configurator specified");
+ return -1;
+ }
+
+ if (!curve) {
+ auth->curve = &dpp_curves[0];
+ } else {
+ auth->curve = dpp_get_curve_name(curve);
+ if (!auth->curve) {
+ wpa_printf(MSG_INFO, "DPP: Unsupported curve: %s",
+ curve);
+ return -1;
+ }
+ }
+ wpa_printf(MSG_DEBUG,
+ "DPP: Building own configuration/connector with curve %s",
+ auth->curve->name);
+
+ auth->own_protocol_key = dpp_gen_keypair(auth->curve);
+ if (!auth->own_protocol_key)
+ return -1;
+ dpp_copy_netaccesskey(auth);
+ auth->peer_protocol_key = auth->own_protocol_key;
+ dpp_copy_csign(auth, auth->conf->csign);
+
+ conf_obj = dpp_build_conf_obj(auth, ap);
+ if (!conf_obj)
+ goto fail;
+ ret = dpp_parse_conf_obj(auth, wpabuf_head(conf_obj),
+ wpabuf_len(conf_obj));
+fail:
+ wpabuf_free(conf_obj);
+ auth->peer_protocol_key = NULL;
+ return ret;
+}
+
+
+static int dpp_compatible_netrole(const char *role1, const char *role2)
+{
+ return (os_strcmp(role1, "sta") == 0 && os_strcmp(role2, "ap") == 0) ||
+ (os_strcmp(role1, "ap") == 0 && os_strcmp(role2, "sta") == 0);
+}
+
+
+static int dpp_connector_compatible_group(struct json_token *root,
+ const char *group_id,
+ const char *net_role)
+{
+ struct json_token *groups, *token;
+
+ groups = json_get_member(root, "groups");
+ if (!groups || groups->type != JSON_ARRAY)
+ return 0;
+
+ for (token = groups->child; token; token = token->sibling) {
+ struct json_token *id, *role;
+
+ id = json_get_member(token, "groupId");
+ if (!id || id->type != JSON_STRING)
+ continue;
+
+ role = json_get_member(token, "netRole");
+ if (!role || role->type != JSON_STRING)
+ continue;
+
+ if (os_strcmp(id->string, "*") != 0 &&
+ os_strcmp(group_id, "*") != 0 &&
+ os_strcmp(id->string, group_id) != 0)
+ continue;
+
+ if (dpp_compatible_netrole(role->string, net_role))
+ return 1;
+ }
+
+ return 0;
+}
+
+
+static int dpp_connector_match_groups(struct json_token *own_root,
+ struct json_token *peer_root)
+{
+ struct json_token *groups, *token;
+
+ groups = json_get_member(peer_root, "groups");
+ if (!groups || groups->type != JSON_ARRAY) {
+ wpa_printf(MSG_DEBUG, "DPP: No peer groups array found");
+ return 0;
+ }
+
+ for (token = groups->child; token; token = token->sibling) {
+ struct json_token *id, *role;
+
+ id = json_get_member(token, "groupId");
+ if (!id || id->type != JSON_STRING) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Missing peer groupId string");
+ continue;
+ }
+
+ role = json_get_member(token, "netRole");
+ if (!role || role->type != JSON_STRING) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Missing peer groups::netRole string");
+ continue;
+ }
+ wpa_printf(MSG_DEBUG,
+ "DPP: peer connector group: groupId='%s' netRole='%s'",
+ id->string, role->string);
+ if (dpp_connector_compatible_group(own_root, id->string,
+ role->string)) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Compatible group/netRole in own connector");
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+
+static int dpp_derive_pmk(const u8 *Nx, size_t Nx_len, u8 *pmk,
+ unsigned int hash_len)
+{
+ u8 salt[DPP_MAX_HASH_LEN], prk[DPP_MAX_HASH_LEN];
+ const char *info = "DPP PMK";
+ int res;
+
+ /* PMK = HKDF(<>, "DPP PMK", N.x) */
+
+ /* HKDF-Extract(<>, N.x) */
+ os_memset(salt, 0, hash_len);
+ if (dpp_hmac(hash_len, salt, hash_len, Nx, Nx_len, prk) < 0)
+ return -1;
+ wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM=N.x)",
+ prk, hash_len);
+
+ /* HKDF-Expand(PRK, info, L) */
+ res = dpp_hkdf_expand(hash_len, prk, hash_len, info, pmk, hash_len);
+ os_memset(prk, 0, hash_len);
+ if (res < 0)
+ return -1;
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: PMK = HKDF-Expand(PRK, info, L)",
+ pmk, hash_len);
+ return 0;
+}
+
+
+static int dpp_derive_pmkid(const struct dpp_curve_params *curve,
+ EVP_PKEY *own_key, EVP_PKEY *peer_key, u8 *pmkid)
+{
+ struct wpabuf *nkx, *pkx;
+ int ret = -1, res;
+ const u8 *addr[2];
+ size_t len[2];
+ u8 hash[SHA256_MAC_LEN];
+
+ /* PMKID = Truncate-128(H(min(NK.x, PK.x) | max(NK.x, PK.x))) */
+ nkx = dpp_get_pubkey_point(own_key, 0);
+ pkx = dpp_get_pubkey_point(peer_key, 0);
+ if (!nkx || !pkx)
+ goto fail;
+ addr[0] = wpabuf_head(nkx);
+ len[0] = wpabuf_len(nkx) / 2;
+ addr[1] = wpabuf_head(pkx);
+ len[1] = wpabuf_len(pkx) / 2;
+ if (len[0] != len[1])
+ goto fail;
+ if (os_memcmp(addr[0], addr[1], len[0]) > 0) {
+ addr[0] = wpabuf_head(pkx);
+ addr[1] = wpabuf_head(nkx);
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: PMKID hash payload 1", addr[0], len[0]);
+ wpa_hexdump(MSG_DEBUG, "DPP: PMKID hash payload 2", addr[1], len[1]);
+ res = sha256_vector(2, addr, len, hash);
+ if (res < 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: PMKID hash output", hash, SHA256_MAC_LEN);
+ os_memcpy(pmkid, hash, PMKID_LEN);
+ wpa_hexdump(MSG_DEBUG, "DPP: PMKID", pmkid, PMKID_LEN);
+ ret = 0;
+fail:
+ wpabuf_free(nkx);
+ wpabuf_free(pkx);
+ return ret;
+}
+
+
+enum dpp_status_error
+dpp_peer_intro(struct dpp_introduction *intro, const char *own_connector,
+ const u8 *net_access_key, size_t net_access_key_len,
+ const u8 *csign_key, size_t csign_key_len,
+ const u8 *peer_connector, size_t peer_connector_len,
+ os_time_t *expiry)
+{
+ struct json_token *root = NULL, *netkey, *token;
+ struct json_token *own_root = NULL;
+ enum dpp_status_error ret = 255, res;
+ EVP_PKEY *own_key = NULL, *peer_key = NULL;
+ struct wpabuf *own_key_pub = NULL;
+ const struct dpp_curve_params *curve, *own_curve;
+ struct dpp_signed_connector_info info;
+ const unsigned char *p;
+ EVP_PKEY *csign = NULL;
+ char *signed_connector = NULL;
+ const char *pos, *end;
+ unsigned char *own_conn = NULL;
+ size_t own_conn_len;
+ EVP_PKEY_CTX *ctx = NULL;
+ size_t Nx_len;
+ u8 Nx[DPP_MAX_SHARED_SECRET_LEN];
+
+ os_memset(intro, 0, sizeof(*intro));
+ os_memset(&info, 0, sizeof(info));
+ if (expiry)
+ *expiry = 0;
+
+ p = csign_key;
+ csign = d2i_PUBKEY(NULL, &p, csign_key_len);
+ if (!csign) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to parse local C-sign-key information");
+ goto fail;
+ }
+
+ own_key = dpp_set_keypair(&own_curve, net_access_key,
+ net_access_key_len);
+ if (!own_key) {
+ wpa_printf(MSG_ERROR, "DPP: Failed to parse own netAccessKey");
+ goto fail;
+ }
+
+ pos = os_strchr(own_connector, '.');
+ if (!pos) {
+ wpa_printf(MSG_DEBUG, "DPP: Own connector is missing the first dot (.)");
+ goto fail;
+ }
+ pos++;
+ end = os_strchr(pos, '.');
+ if (!end) {
+ wpa_printf(MSG_DEBUG, "DPP: Own connector is missing the second dot (.)");
+ goto fail;
+ }
+ own_conn = base64_url_decode((const unsigned char *) pos,
+ end - pos, &own_conn_len);
+ if (!own_conn) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Failed to base64url decode own signedConnector JWS Payload");
+ goto fail;
+ }
+
+ own_root = json_parse((const char *) own_conn, own_conn_len);
+ if (!own_root) {
+ wpa_printf(MSG_DEBUG, "DPP: Failed to parse local connector");
+ goto fail;
+ }
+
+ wpa_hexdump_ascii(MSG_DEBUG, "DPP: Peer signedConnector",
+ peer_connector, peer_connector_len);
+ signed_connector = os_malloc(peer_connector_len + 1);
+ if (!signed_connector)
+ goto fail;
+ os_memcpy(signed_connector, peer_connector, peer_connector_len);
+ signed_connector[peer_connector_len] = '\0';
+
+ res = dpp_process_signed_connector(&info, csign, signed_connector);
+ if (res != DPP_STATUS_OK) {
+ ret = res;
+ goto fail;
+ }
+
+ root = json_parse((const char *) info.payload, info.payload_len);
+ if (!root) {
+ wpa_printf(MSG_DEBUG, "DPP: JSON parsing of connector failed");
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+
+ if (!dpp_connector_match_groups(own_root, root)) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Peer connector does not include compatible group netrole with own connector");
+ ret = DPP_STATUS_NO_MATCH;
+ goto fail;
+ }
+
+ token = json_get_member(root, "expiry");
+ if (!token || token->type != JSON_STRING) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: No expiry string found - connector does not expire");
+ } else {
+ wpa_printf(MSG_DEBUG, "DPP: expiry = %s", token->string);
+ if (dpp_key_expired(token->string, expiry)) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Connector (netAccessKey) has expired");
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+ }
+
+ netkey = json_get_member(root, "netAccessKey");
+ if (!netkey || netkey->type != JSON_OBJECT) {
+ wpa_printf(MSG_DEBUG, "DPP: No netAccessKey object found");
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+
+ peer_key = dpp_parse_jwk(netkey, &curve);
+ if (!peer_key) {
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+ dpp_debug_print_key("DPP: Received netAccessKey", peer_key);
+
+ if (own_curve != curve) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: Mismatching netAccessKey curves (%s != %s)",
+ own_curve->name, curve->name);
+ ret = DPP_STATUS_INVALID_CONNECTOR;
+ goto fail;
+ }
+
+ /* ECDH: N = nk * PK */
+ ctx = EVP_PKEY_CTX_new(own_key, NULL);
+ if (!ctx ||
+ EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, peer_key) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &Nx_len) != 1 ||
+ Nx_len > DPP_MAX_SHARED_SECRET_LEN ||
+ EVP_PKEY_derive(ctx, Nx, &Nx_len) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to derive ECDH shared secret: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (N.x)",
+ Nx, Nx_len);
+
+ /* PMK = HKDF(<>, "DPP PMK", N.x) */
+ if (dpp_derive_pmk(Nx, Nx_len, intro->pmk, curve->hash_len) < 0) {
+ wpa_printf(MSG_ERROR, "DPP: Failed to derive PMK");
+ goto fail;
+ }
+ intro->pmk_len = curve->hash_len;
+
+ /* PMKID = Truncate-128(H(min(NK.x, PK.x) | max(NK.x, PK.x))) */
+ if (dpp_derive_pmkid(curve, own_key, peer_key, intro->pmkid) < 0) {
+ wpa_printf(MSG_ERROR, "DPP: Failed to derive PMKID");
+ goto fail;
+ }
+
+ ret = DPP_STATUS_OK;
+fail:
+ if (ret != DPP_STATUS_OK)
+ os_memset(intro, 0, sizeof(*intro));
+ os_memset(Nx, 0, sizeof(Nx));
+ EVP_PKEY_CTX_free(ctx);
+ os_free(own_conn);
+ os_free(signed_connector);
+ os_free(info.payload);
+ EVP_PKEY_free(own_key);
+ wpabuf_free(own_key_pub);
+ EVP_PKEY_free(peer_key);
+ EVP_PKEY_free(csign);
+ json_free(root);
+ json_free(own_root);
+ return ret;
+}
+
+
+static EVP_PKEY * dpp_pkex_get_role_elem(const struct dpp_curve_params *curve,
+ int init)
+{
+ EC_GROUP *group;
+ size_t len = curve->prime_len;
+ const u8 *x, *y;
+
+ switch (curve->ike_group) {
+ case 19:
+ x = init ? pkex_init_x_p256 : pkex_resp_x_p256;
+ y = init ? pkex_init_y_p256 : pkex_resp_y_p256;
+ break;
+ case 20:
+ x = init ? pkex_init_x_p384 : pkex_resp_x_p384;
+ y = init ? pkex_init_y_p384 : pkex_resp_y_p384;
+ break;
+ case 21:
+ x = init ? pkex_init_x_p521 : pkex_resp_x_p521;
+ y = init ? pkex_init_y_p521 : pkex_resp_y_p521;
+ break;
+ case 28:
+ x = init ? pkex_init_x_bp_p256r1 : pkex_resp_x_bp_p256r1;
+ y = init ? pkex_init_y_bp_p256r1 : pkex_resp_y_bp_p256r1;
+ break;
+ case 29:
+ x = init ? pkex_init_x_bp_p384r1 : pkex_resp_x_bp_p384r1;
+ y = init ? pkex_init_y_bp_p384r1 : pkex_resp_y_bp_p384r1;
+ break;
+ case 30:
+ x = init ? pkex_init_x_bp_p512r1 : pkex_resp_x_bp_p512r1;
+ y = init ? pkex_init_y_bp_p512r1 : pkex_resp_y_bp_p512r1;
+ break;
+ default:
+ return NULL;
+ }
+
+ group = EC_GROUP_new_by_curve_name(OBJ_txt2nid(curve->name));
+ if (!group)
+ return NULL;
+ return dpp_set_pubkey_point_group(group, x, y, len);
+}
+
+
+static EC_POINT * dpp_pkex_derive_Qi(const struct dpp_curve_params *curve,
+ const u8 *mac_init, const char *code,
+ const char *identifier, BN_CTX *bnctx,
+ const EC_GROUP **ret_group)
+{
+ u8 hash[DPP_MAX_HASH_LEN];
+ const u8 *addr[3];
+ size_t len[3];
+ unsigned int num_elem = 0;
+ EC_POINT *Qi = NULL;
+ EVP_PKEY *Pi = NULL;
+ EC_KEY *Pi_ec = NULL;
+ const EC_POINT *Pi_point;
+ BIGNUM *hash_bn = NULL;
+ const EC_GROUP *group = NULL;
+ EC_GROUP *group2 = NULL;
+
+ /* Qi = H(MAC-Initiator | [identifier |] code) * Pi */
+
+ wpa_printf(MSG_DEBUG, "DPP: MAC-Initiator: " MACSTR, MAC2STR(mac_init));
+ addr[num_elem] = mac_init;
+ len[num_elem] = ETH_ALEN;
+ num_elem++;
+ if (identifier) {
+ wpa_printf(MSG_DEBUG, "DPP: code identifier: %s",
+ identifier);
+ addr[num_elem] = (const u8 *) identifier;
+ len[num_elem] = os_strlen(identifier);
+ num_elem++;
+ }
+ wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: code", code, os_strlen(code));
+ addr[num_elem] = (const u8 *) code;
+ len[num_elem] = os_strlen(code);
+ num_elem++;
+ if (dpp_hash_vector(curve, num_elem, addr, len, hash) < 0)
+ goto fail;
+ wpa_hexdump_key(MSG_DEBUG,
+ "DPP: H(MAC-Initiator | [identifier |] code)",
+ hash, curve->hash_len);
+ Pi = dpp_pkex_get_role_elem(curve, 1);
+ if (!Pi)
+ goto fail;
+ dpp_debug_print_key("DPP: Pi", Pi);
+ Pi_ec = EVP_PKEY_get1_EC_KEY(Pi);
+ if (!Pi_ec)
+ goto fail;
+ Pi_point = EC_KEY_get0_public_key(Pi_ec);
+
+ group = EC_KEY_get0_group(Pi_ec);
+ if (!group)
+ goto fail;
+ group2 = EC_GROUP_dup(group);
+ if (!group2)
+ goto fail;
+ Qi = EC_POINT_new(group2);
+ if (!Qi) {
+ EC_GROUP_free(group2);
+ goto fail;
+ }
+ hash_bn = BN_bin2bn(hash, curve->hash_len, NULL);
+ if (!hash_bn ||
+ EC_POINT_mul(group2, Qi, NULL, Pi_point, hash_bn, bnctx) != 1)
+ goto fail;
+ if (EC_POINT_is_at_infinity(group, Qi)) {
+ wpa_printf(MSG_INFO, "DPP: Qi is the point-at-infinity");
+ goto fail;
+ }
+ dpp_debug_print_point("DPP: Qi", group, Qi);
+out:
+ EC_KEY_free(Pi_ec);
+ EVP_PKEY_free(Pi);
+ BN_clear_free(hash_bn);
+ if (ret_group)
+ *ret_group = group2;
+ return Qi;
+fail:
+ EC_POINT_free(Qi);
+ Qi = NULL;
+ goto out;
+}
+
+
+static EC_POINT * dpp_pkex_derive_Qr(const struct dpp_curve_params *curve,
+ const u8 *mac_resp, const char *code,
+ const char *identifier, BN_CTX *bnctx,
+ const EC_GROUP **ret_group)
+{
+ u8 hash[DPP_MAX_HASH_LEN];
+ const u8 *addr[3];
+ size_t len[3];
+ unsigned int num_elem = 0;
+ EC_POINT *Qr = NULL;
+ EVP_PKEY *Pr = NULL;
+ EC_KEY *Pr_ec = NULL;
+ const EC_POINT *Pr_point;
+ BIGNUM *hash_bn = NULL;
+ const EC_GROUP *group = NULL;
+ EC_GROUP *group2 = NULL;
+
+ /* Qr = H(MAC-Responder | | [identifier | ] code) * Pr */
+
+ wpa_printf(MSG_DEBUG, "DPP: MAC-Responder: " MACSTR, MAC2STR(mac_resp));
+ addr[num_elem] = mac_resp;
+ len[num_elem] = ETH_ALEN;
+ num_elem++;
+ if (identifier) {
+ wpa_printf(MSG_DEBUG, "DPP: code identifier: %s",
+ identifier);
+ addr[num_elem] = (const u8 *) identifier;
+ len[num_elem] = os_strlen(identifier);
+ num_elem++;
+ }
+ wpa_hexdump_ascii_key(MSG_DEBUG, "DPP: code", code, os_strlen(code));
+ addr[num_elem] = (const u8 *) code;
+ len[num_elem] = os_strlen(code);
+ num_elem++;
+ if (dpp_hash_vector(curve, num_elem, addr, len, hash) < 0)
+ goto fail;
+ wpa_hexdump_key(MSG_DEBUG,
+ "DPP: H(MAC-Responder | [identifier |] code)",
+ hash, curve->hash_len);
+ Pr = dpp_pkex_get_role_elem(curve, 0);
+ if (!Pr)
+ goto fail;
+ dpp_debug_print_key("DPP: Pr", Pr);
+ Pr_ec = EVP_PKEY_get1_EC_KEY(Pr);
+ if (!Pr_ec)
+ goto fail;
+ Pr_point = EC_KEY_get0_public_key(Pr_ec);
+
+ group = EC_KEY_get0_group(Pr_ec);
+ if (!group)
+ goto fail;
+ group2 = EC_GROUP_dup(group);
+ if (!group2)
+ goto fail;
+ Qr = EC_POINT_new(group2);
+ if (!Qr) {
+ EC_GROUP_free(group2);
+ goto fail;
+ }
+ hash_bn = BN_bin2bn(hash, curve->hash_len, NULL);
+ if (!hash_bn ||
+ EC_POINT_mul(group2, Qr, NULL, Pr_point, hash_bn, bnctx) != 1)
+ goto fail;
+ if (EC_POINT_is_at_infinity(group, Qr)) {
+ wpa_printf(MSG_INFO, "DPP: Qr is the point-at-infinity");
+ goto fail;
+ }
+ dpp_debug_print_point("DPP: Qr", group, Qr);
+out:
+ EC_KEY_free(Pr_ec);
+ EVP_PKEY_free(Pr);
+ BN_clear_free(hash_bn);
+ if (ret_group)
+ *ret_group = group2;
+ return Qr;
+fail:
+ EC_POINT_free(Qr);
+ Qr = NULL;
+ goto out;
+}
+
+
+#ifdef CONFIG_TESTING_OPTIONS
+static int dpp_test_gen_invalid_key(struct wpabuf *msg,
+ const struct dpp_curve_params *curve)
+{
+ BN_CTX *ctx;
+ BIGNUM *x, *y;
+ int ret = -1;
+ EC_GROUP *group;
+ EC_POINT *point;
+
+ group = EC_GROUP_new_by_curve_name(OBJ_txt2nid(curve->name));
+ if (!group)
+ return -1;
+
+ ctx = BN_CTX_new();
+ point = EC_POINT_new(group);
+ x = BN_new();
+ y = BN_new();
+ if (!ctx || !point || !x || !y)
+ goto fail;
+
+ if (BN_rand(x, curve->prime_len * 8, 0, 0) != 1)
+ goto fail;
+
+ /* Generate a random y coordinate that results in a point that is not
+ * on the curve. */
+ for (;;) {
+ if (BN_rand(y, curve->prime_len * 8, 0, 0) != 1)
+ goto fail;
+
+ if (EC_POINT_set_affine_coordinates_GFp(group, point, x, y,
+ ctx) != 1) {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L || defined(OPENSSL_IS_BORINGSSL)
+ /* Unlike older OpenSSL versions, OpenSSL 1.1.1 and BoringSSL
+ * return an error from EC_POINT_set_affine_coordinates_GFp()
+ * when the point is not on the curve. */
+ break;
+#else /* >=1.1.0 or OPENSSL_IS_BORINGSSL */
+ goto fail;
+#endif /* >= 1.1.0 or OPENSSL_IS_BORINGSSL */
+ }
+
+ if (!EC_POINT_is_on_curve(group, point, ctx))
+ break;
+ }
+
+ if (dpp_bn2bin_pad(x, wpabuf_put(msg, curve->prime_len),
+ curve->prime_len) < 0 ||
+ dpp_bn2bin_pad(y, wpabuf_put(msg, curve->prime_len),
+ curve->prime_len) < 0)
+ goto fail;
+
+ ret = 0;
+fail:
+ if (ret < 0)
+ wpa_printf(MSG_INFO, "DPP: Failed to generate invalid key");
+ BN_free(x);
+ BN_free(y);
+ EC_POINT_free(point);
+ BN_CTX_free(ctx);
+
+ return ret;
+}
+#endif /* CONFIG_TESTING_OPTIONS */
+
+
+static struct wpabuf * dpp_pkex_build_exchange_req(struct dpp_pkex *pkex)
+{
+ EC_KEY *X_ec = NULL;
+ const EC_POINT *X_point;
+ BN_CTX *bnctx = NULL;
+ const EC_GROUP *group;
+ EC_POINT *Qi = NULL, *M = NULL;
+ struct wpabuf *M_buf = NULL;
+ BIGNUM *Mx = NULL, *My = NULL;
+ struct wpabuf *msg = NULL;
+ size_t attr_len;
+ const struct dpp_curve_params *curve = pkex->own_bi->curve;
+
+ wpa_printf(MSG_DEBUG, "DPP: Build PKEX Exchange Request");
+
+ /* Qi = H(MAC-Initiator | [identifier |] code) * Pi */
+ bnctx = BN_CTX_new();
+ if (!bnctx)
+ goto fail;
+ Qi = dpp_pkex_derive_Qi(curve, pkex->own_mac, pkex->code,
+ pkex->identifier, bnctx, &group);
+ if (!Qi)
+ goto fail;
+
+ /* Generate a random ephemeral keypair x/X */
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_pkex_ephemeral_key_override_len) {
+ const struct dpp_curve_params *tmp_curve;
+
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - override ephemeral key x/X");
+ pkex->x = dpp_set_keypair(&tmp_curve,
+ dpp_pkex_ephemeral_key_override,
+ dpp_pkex_ephemeral_key_override_len);
+ } else {
+ pkex->x = dpp_gen_keypair(curve);
+ }
+#else /* CONFIG_TESTING_OPTIONS */
+ pkex->x = dpp_gen_keypair(curve);
+#endif /* CONFIG_TESTING_OPTIONS */
+ if (!pkex->x)
+ goto fail;
+
+ /* M = X + Qi */
+ X_ec = EVP_PKEY_get1_EC_KEY(pkex->x);
+ if (!X_ec)
+ goto fail;
+ X_point = EC_KEY_get0_public_key(X_ec);
+ if (!X_point)
+ goto fail;
+ dpp_debug_print_point("DPP: X", group, X_point);
+ M = EC_POINT_new(group);
+ Mx = BN_new();
+ My = BN_new();
+ if (!M || !Mx || !My ||
+ EC_POINT_add(group, M, X_point, Qi, bnctx) != 1 ||
+ EC_POINT_get_affine_coordinates_GFp(group, M, Mx, My, bnctx) != 1)
+ goto fail;
+ dpp_debug_print_point("DPP: M", group, M);
+
+ /* Initiator -> Responder: group, [identifier,] M */
+ attr_len = 4 + 2;
+ if (pkex->identifier)
+ attr_len += 4 + os_strlen(pkex->identifier);
+ attr_len += 4 + 2 * curve->prime_len;
+ msg = dpp_alloc_msg(DPP_PA_PKEX_EXCHANGE_REQ, attr_len);
+ if (!msg)
+ goto fail;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_FINITE_CYCLIC_GROUP_PKEX_EXCHANGE_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Finite Cyclic Group");
+ goto skip_finite_cyclic_group;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* Finite Cyclic Group attribute */
+ wpabuf_put_le16(msg, DPP_ATTR_FINITE_CYCLIC_GROUP);
+ wpabuf_put_le16(msg, 2);
+ wpabuf_put_le16(msg, curve->ike_group);
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_finite_cyclic_group:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* Code Identifier attribute */
+ if (pkex->identifier) {
+ wpabuf_put_le16(msg, DPP_ATTR_CODE_IDENTIFIER);
+ wpabuf_put_le16(msg, os_strlen(pkex->identifier));
+ wpabuf_put_str(msg, pkex->identifier);
+ }
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_ENCRYPTED_KEY_PKEX_EXCHANGE_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Encrypted Key");
+ goto out;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* M in Encrypted Key attribute */
+ wpabuf_put_le16(msg, DPP_ATTR_ENCRYPTED_KEY);
+ wpabuf_put_le16(msg, 2 * curve->prime_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_INVALID_ENCRYPTED_KEY_PKEX_EXCHANGE_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid Encrypted Key");
+ if (dpp_test_gen_invalid_key(msg, curve) < 0)
+ goto fail;
+ goto out;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ if (dpp_bn2bin_pad(Mx, wpabuf_put(msg, curve->prime_len),
+ curve->prime_len) < 0 ||
+ dpp_bn2bin_pad(Mx, pkex->Mx, curve->prime_len) < 0 ||
+ dpp_bn2bin_pad(My, wpabuf_put(msg, curve->prime_len),
+ curve->prime_len) < 0)
+ goto fail;
+
+out:
+ wpabuf_free(M_buf);
+ EC_KEY_free(X_ec);
+ EC_POINT_free(M);
+ EC_POINT_free(Qi);
+ BN_clear_free(Mx);
+ BN_clear_free(My);
+ BN_CTX_free(bnctx);
+ return msg;
+fail:
+ wpa_printf(MSG_INFO, "DPP: Failed to build PKEX Exchange Request");
+ wpabuf_free(msg);
+ msg = NULL;
+ goto out;
+}
+
+
+static void dpp_pkex_fail(struct dpp_pkex *pkex, const char *txt)
+{
+ wpa_msg(pkex->msg_ctx, MSG_INFO, DPP_EVENT_FAIL "%s", txt);
+}
+
+
+struct dpp_pkex * dpp_pkex_init(void *msg_ctx, struct dpp_bootstrap_info *bi,
+ const u8 *own_mac,
+ const char *identifier,
+ const char *code)
+{
+ struct dpp_pkex *pkex;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (!is_zero_ether_addr(dpp_pkex_own_mac_override)) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - own_mac override " MACSTR,
+ MAC2STR(dpp_pkex_own_mac_override));
+ own_mac = dpp_pkex_own_mac_override;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ pkex = os_zalloc(sizeof(*pkex));
+ if (!pkex)
+ return NULL;
+ pkex->msg_ctx = msg_ctx;
+ pkex->initiator = 1;
+ pkex->own_bi = bi;
+ os_memcpy(pkex->own_mac, own_mac, ETH_ALEN);
+ if (identifier) {
+ pkex->identifier = os_strdup(identifier);
+ if (!pkex->identifier)
+ goto fail;
+ }
+ pkex->code = os_strdup(code);
+ if (!pkex->code)
+ goto fail;
+ pkex->exchange_req = dpp_pkex_build_exchange_req(pkex);
+ if (!pkex->exchange_req)
+ goto fail;
+ return pkex;
+fail:
+ dpp_pkex_free(pkex);
+ return NULL;
+}
+
+
+static struct wpabuf *
+dpp_pkex_build_exchange_resp(struct dpp_pkex *pkex,
+ enum dpp_status_error status,
+ const BIGNUM *Nx, const BIGNUM *Ny)
+{
+ struct wpabuf *msg = NULL;
+ size_t attr_len;
+ const struct dpp_curve_params *curve = pkex->own_bi->curve;
+
+ /* Initiator -> Responder: DPP Status, [identifier,] N */
+ attr_len = 4 + 1;
+ if (pkex->identifier)
+ attr_len += 4 + os_strlen(pkex->identifier);
+ attr_len += 4 + 2 * curve->prime_len;
+ msg = dpp_alloc_msg(DPP_PA_PKEX_EXCHANGE_RESP, attr_len);
+ if (!msg)
+ goto fail;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_STATUS_PKEX_EXCHANGE_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Status");
+ goto skip_status;
+ }
+
+ if (dpp_test == DPP_TEST_INVALID_STATUS_PKEX_EXCHANGE_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid Status");
+ status = 255;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* DPP Status */
+ dpp_build_attr_status(msg, status);
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_status:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* Code Identifier attribute */
+ if (pkex->identifier) {
+ wpabuf_put_le16(msg, DPP_ATTR_CODE_IDENTIFIER);
+ wpabuf_put_le16(msg, os_strlen(pkex->identifier));
+ wpabuf_put_str(msg, pkex->identifier);
+ }
+
+ if (status != DPP_STATUS_OK)
+ goto skip_encrypted_key;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_ENCRYPTED_KEY_PKEX_EXCHANGE_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Encrypted Key");
+ goto skip_encrypted_key;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* N in Encrypted Key attribute */
+ wpabuf_put_le16(msg, DPP_ATTR_ENCRYPTED_KEY);
+ wpabuf_put_le16(msg, 2 * curve->prime_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_INVALID_ENCRYPTED_KEY_PKEX_EXCHANGE_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid Encrypted Key");
+ if (dpp_test_gen_invalid_key(msg, curve) < 0)
+ goto fail;
+ goto skip_encrypted_key;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ if (dpp_bn2bin_pad(Nx, wpabuf_put(msg, curve->prime_len),
+ curve->prime_len) < 0 ||
+ dpp_bn2bin_pad(Nx, pkex->Nx, curve->prime_len) < 0 ||
+ dpp_bn2bin_pad(Ny, wpabuf_put(msg, curve->prime_len),
+ curve->prime_len) < 0)
+ goto fail;
+
+skip_encrypted_key:
+ if (status == DPP_STATUS_BAD_GROUP) {
+ /* Finite Cyclic Group attribute */
+ wpabuf_put_le16(msg, DPP_ATTR_FINITE_CYCLIC_GROUP);
+ wpabuf_put_le16(msg, 2);
+ wpabuf_put_le16(msg, curve->ike_group);
+ }
+
+ return msg;
+fail:
+ wpabuf_free(msg);
+ return NULL;
+}
+
+
+static int dpp_pkex_derive_z(const u8 *mac_init, const u8 *mac_resp,
+ const u8 *Mx, size_t Mx_len,
+ const u8 *Nx, size_t Nx_len,
+ const char *code,
+ const u8 *Kx, size_t Kx_len,
+ u8 *z, unsigned int hash_len)
+{
+ u8 salt[DPP_MAX_HASH_LEN], prk[DPP_MAX_HASH_LEN];
+ int res;
+ u8 *info, *pos;
+ size_t info_len;
+
+ /* z = HKDF(<>, MAC-Initiator | MAC-Responder | M.x | N.x | code, K.x)
+ */
+
+ /* HKDF-Extract(<>, IKM=K.x) */
+ os_memset(salt, 0, hash_len);
+ if (dpp_hmac(hash_len, salt, hash_len, Kx, Kx_len, prk) < 0)
+ return -1;
+ wpa_hexdump_key(MSG_DEBUG, "DPP: PRK = HKDF-Extract(<>, IKM)",
+ prk, hash_len);
+ info_len = 2 * ETH_ALEN + Mx_len + Nx_len + os_strlen(code);
+ info = os_malloc(info_len);
+ if (!info)
+ return -1;
+ pos = info;
+ os_memcpy(pos, mac_init, ETH_ALEN);
+ pos += ETH_ALEN;
+ os_memcpy(pos, mac_resp, ETH_ALEN);
+ pos += ETH_ALEN;
+ os_memcpy(pos, Mx, Mx_len);
+ pos += Mx_len;
+ os_memcpy(pos, Nx, Nx_len);
+ pos += Nx_len;
+ os_memcpy(pos, code, os_strlen(code));
+
+ /* HKDF-Expand(PRK, info, L) */
+ if (hash_len == 32)
+ res = hmac_sha256_kdf(prk, hash_len, NULL, info, info_len,
+ z, hash_len);
+ else if (hash_len == 48)
+ res = hmac_sha384_kdf(prk, hash_len, NULL, info, info_len,
+ z, hash_len);
+ else if (hash_len == 64)
+ res = hmac_sha512_kdf(prk, hash_len, NULL, info, info_len,
+ z, hash_len);
+ else
+ res = -1;
+ os_free(info);
+ os_memset(prk, 0, hash_len);
+ if (res < 0)
+ return -1;
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: z = HKDF-Expand(PRK, info, L)",
+ z, hash_len);
+ return 0;
+}
+
+
+static int dpp_pkex_identifier_match(const u8 *attr_id, u16 attr_id_len,
+ const char *identifier)
+{
+ if (!attr_id && identifier) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: No PKEX code identifier received, but expected one");
+ return 0;
+ }
+
+ if (attr_id && !identifier) {
+ wpa_printf(MSG_DEBUG,
+ "DPP: PKEX code identifier received, but not expecting one");
+ return 0;
+ }
+
+ if (attr_id && identifier &&
+ (os_strlen(identifier) != attr_id_len ||
+ os_memcmp(identifier, attr_id, attr_id_len) != 0)) {
+ wpa_printf(MSG_DEBUG, "DPP: PKEX code identifier mismatch");
+ return 0;
+ }
+
+ return 1;
+}
+
+
+struct dpp_pkex * dpp_pkex_rx_exchange_req(void *msg_ctx,
+ struct dpp_bootstrap_info *bi,
+ const u8 *own_mac,
+ const u8 *peer_mac,
+ const char *identifier,
+ const char *code,
+ const u8 *buf, size_t len)
+{
+ const u8 *attr_group, *attr_id, *attr_key;
+ u16 attr_group_len, attr_id_len, attr_key_len;
+ const struct dpp_curve_params *curve = bi->curve;
+ u16 ike_group;
+ struct dpp_pkex *pkex = NULL;
+ EC_POINT *Qi = NULL, *Qr = NULL, *M = NULL, *X = NULL, *N = NULL;
+ BN_CTX *bnctx = NULL;
+ const EC_GROUP *group;
+ BIGNUM *Mx = NULL, *My = NULL;
+ EC_KEY *Y_ec = NULL, *X_ec = NULL;;
+ const EC_POINT *Y_point;
+ BIGNUM *Nx = NULL, *Ny = NULL;
+ u8 Kx[DPP_MAX_SHARED_SECRET_LEN];
+ size_t Kx_len;
+ int res;
+ EVP_PKEY_CTX *ctx = NULL;
+
+ if (bi->pkex_t >= PKEX_COUNTER_T_LIMIT) {
+ wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
+ "PKEX counter t limit reached - ignore message");
+ return NULL;
+ }
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (!is_zero_ether_addr(dpp_pkex_peer_mac_override)) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - peer_mac override " MACSTR,
+ MAC2STR(dpp_pkex_peer_mac_override));
+ peer_mac = dpp_pkex_peer_mac_override;
+ }
+ if (!is_zero_ether_addr(dpp_pkex_own_mac_override)) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - own_mac override " MACSTR,
+ MAC2STR(dpp_pkex_own_mac_override));
+ own_mac = dpp_pkex_own_mac_override;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ attr_id_len = 0;
+ attr_id = dpp_get_attr(buf, len, DPP_ATTR_CODE_IDENTIFIER,
+ &attr_id_len);
+ if (!dpp_pkex_identifier_match(attr_id, attr_id_len, identifier))
+ return NULL;
+
+ attr_group = dpp_get_attr(buf, len, DPP_ATTR_FINITE_CYCLIC_GROUP,
+ &attr_group_len);
+ if (!attr_group || attr_group_len != 2) {
+ wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
+ "Missing or invalid Finite Cyclic Group attribute");
+ return NULL;
+ }
+ ike_group = WPA_GET_LE16(attr_group);
+ if (ike_group != curve->ike_group) {
+ wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
+ "Mismatching PKEX curve: peer=%u own=%u",
+ ike_group, curve->ike_group);
+ pkex = os_zalloc(sizeof(*pkex));
+ if (!pkex)
+ goto fail;
+ pkex->own_bi = bi;
+ pkex->failed = 1;
+ pkex->exchange_resp = dpp_pkex_build_exchange_resp(
+ pkex, DPP_STATUS_BAD_GROUP, NULL, NULL);
+ if (!pkex->exchange_resp)
+ goto fail;
+ return pkex;
+ }
+
+ /* M in Encrypted Key attribute */
+ attr_key = dpp_get_attr(buf, len, DPP_ATTR_ENCRYPTED_KEY,
+ &attr_key_len);
+ if (!attr_key || attr_key_len & 0x01 || attr_key_len < 2 ||
+ attr_key_len / 2 > DPP_MAX_SHARED_SECRET_LEN) {
+ wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
+ "Missing Encrypted Key attribute");
+ return NULL;
+ }
+
+ /* Qi = H(MAC-Initiator | [identifier |] code) * Pi */
+ bnctx = BN_CTX_new();
+ if (!bnctx)
+ goto fail;
+ Qi = dpp_pkex_derive_Qi(curve, peer_mac, code, identifier, bnctx,
+ &group);
+ if (!Qi)
+ goto fail;
+
+ /* X' = M - Qi */
+ X = EC_POINT_new(group);
+ M = EC_POINT_new(group);
+ Mx = BN_bin2bn(attr_key, attr_key_len / 2, NULL);
+ My = BN_bin2bn(attr_key + attr_key_len / 2, attr_key_len / 2, NULL);
+ if (!X || !M || !Mx || !My ||
+ EC_POINT_set_affine_coordinates_GFp(group, M, Mx, My, bnctx) != 1 ||
+ EC_POINT_is_at_infinity(group, M) ||
+ !EC_POINT_is_on_curve(group, M, bnctx) ||
+ EC_POINT_invert(group, Qi, bnctx) != 1 ||
+ EC_POINT_add(group, X, M, Qi, bnctx) != 1 ||
+ EC_POINT_is_at_infinity(group, X) ||
+ !EC_POINT_is_on_curve(group, X, bnctx)) {
+ wpa_msg(msg_ctx, MSG_INFO, DPP_EVENT_FAIL
+ "Invalid Encrypted Key value");
+ bi->pkex_t++;
+ goto fail;
+ }
+ dpp_debug_print_point("DPP: M", group, M);
+ dpp_debug_print_point("DPP: X'", group, X);
+
+ pkex = os_zalloc(sizeof(*pkex));
+ if (!pkex)
+ goto fail;
+ pkex->t = bi->pkex_t;
+ pkex->msg_ctx = msg_ctx;
+ pkex->own_bi = bi;
+ os_memcpy(pkex->own_mac, own_mac, ETH_ALEN);
+ os_memcpy(pkex->peer_mac, peer_mac, ETH_ALEN);
+ if (identifier) {
+ pkex->identifier = os_strdup(identifier);
+ if (!pkex->identifier)
+ goto fail;
+ }
+ pkex->code = os_strdup(code);
+ if (!pkex->code)
+ goto fail;
+
+ os_memcpy(pkex->Mx, attr_key, attr_key_len / 2);
+
+ X_ec = EC_KEY_new();
+ if (!X_ec ||
+ EC_KEY_set_group(X_ec, group) != 1 ||
+ EC_KEY_set_public_key(X_ec, X) != 1)
+ goto fail;
+ pkex->x = EVP_PKEY_new();
+ if (!pkex->x ||
+ EVP_PKEY_set1_EC_KEY(pkex->x, X_ec) != 1)
+ goto fail;
+
+ /* Qr = H(MAC-Responder | | [identifier | ] code) * Pr */
+ Qr = dpp_pkex_derive_Qr(curve, own_mac, code, identifier, bnctx, NULL);
+ if (!Qr)
+ goto fail;
+
+ /* Generate a random ephemeral keypair y/Y */
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_pkex_ephemeral_key_override_len) {
+ const struct dpp_curve_params *tmp_curve;
+
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - override ephemeral key y/Y");
+ pkex->y = dpp_set_keypair(&tmp_curve,
+ dpp_pkex_ephemeral_key_override,
+ dpp_pkex_ephemeral_key_override_len);
+ } else {
+ pkex->y = dpp_gen_keypair(curve);
+ }
+#else /* CONFIG_TESTING_OPTIONS */
+ pkex->y = dpp_gen_keypair(curve);
+#endif /* CONFIG_TESTING_OPTIONS */
+ if (!pkex->y)
+ goto fail;
+
+ /* N = Y + Qr */
+ Y_ec = EVP_PKEY_get1_EC_KEY(pkex->y);
+ if (!Y_ec)
+ goto fail;
+ Y_point = EC_KEY_get0_public_key(Y_ec);
+ if (!Y_point)
+ goto fail;
+ dpp_debug_print_point("DPP: Y", group, Y_point);
+ N = EC_POINT_new(group);
+ Nx = BN_new();
+ Ny = BN_new();
+ if (!N || !Nx || !Ny ||
+ EC_POINT_add(group, N, Y_point, Qr, bnctx) != 1 ||
+ EC_POINT_get_affine_coordinates_GFp(group, N, Nx, Ny, bnctx) != 1)
+ goto fail;
+ dpp_debug_print_point("DPP: N", group, N);
+
+ pkex->exchange_resp = dpp_pkex_build_exchange_resp(pkex, DPP_STATUS_OK,
+ Nx, Ny);
+ if (!pkex->exchange_resp)
+ goto fail;
+
+ /* K = y * X' */
+ ctx = EVP_PKEY_CTX_new(pkex->y, NULL);
+ if (!ctx ||
+ EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, pkex->x) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &Kx_len) != 1 ||
+ Kx_len > DPP_MAX_SHARED_SECRET_LEN ||
+ EVP_PKEY_derive(ctx, Kx, &Kx_len) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to derive ECDH shared secret: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (K.x)",
+ Kx, Kx_len);
+
+ /* z = HKDF(<>, MAC-Initiator | MAC-Responder | M.x | N.x | code, K.x)
+ */
+ res = dpp_pkex_derive_z(pkex->peer_mac, pkex->own_mac,
+ pkex->Mx, curve->prime_len,
+ pkex->Nx, curve->prime_len, pkex->code,
+ Kx, Kx_len, pkex->z, curve->hash_len);
+ os_memset(Kx, 0, Kx_len);
+ if (res < 0)
+ goto fail;
+
+ pkex->exchange_done = 1;
+
+out:
+ EVP_PKEY_CTX_free(ctx);
+ BN_CTX_free(bnctx);
+ EC_POINT_free(Qi);
+ EC_POINT_free(Qr);
+ BN_free(Mx);
+ BN_free(My);
+ BN_free(Nx);
+ BN_free(Ny);
+ EC_POINT_free(M);
+ EC_POINT_free(N);
+ EC_POINT_free(X);
+ EC_KEY_free(X_ec);
+ EC_KEY_free(Y_ec);
+ return pkex;
+fail:
+ wpa_printf(MSG_DEBUG, "DPP: PKEX Exchange Request processing failed");
+ dpp_pkex_free(pkex);
+ pkex = NULL;
+ goto out;
+}
+
+
+static struct wpabuf *
+dpp_pkex_build_commit_reveal_req(struct dpp_pkex *pkex,
+ const struct wpabuf *A_pub, const u8 *u)
+{
+ const struct dpp_curve_params *curve = pkex->own_bi->curve;
+ struct wpabuf *msg = NULL;
+ size_t clear_len, attr_len;
+ struct wpabuf *clear = NULL;
+ u8 *wrapped;
+ u8 octet;
+ const u8 *addr[2];
+ size_t len[2];
+
+ /* {A, u, [bootstrapping info]}z */
+ clear_len = 4 + 2 * curve->prime_len + 4 + curve->hash_len;
+ clear = wpabuf_alloc(clear_len);
+ attr_len = 4 + clear_len + AES_BLOCK_SIZE;
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_REQ)
+ attr_len += 5;
+#endif /* CONFIG_TESTING_OPTIONS */
+ msg = dpp_alloc_msg(DPP_PA_PKEX_COMMIT_REVEAL_REQ, attr_len);
+ if (!clear || !msg)
+ goto fail;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_BOOTSTRAP_KEY_PKEX_CR_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Bootstrap Key");
+ goto skip_bootstrap_key;
+ }
+ if (dpp_test == DPP_TEST_INVALID_BOOTSTRAP_KEY_PKEX_CR_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid Bootstrap Key");
+ wpabuf_put_le16(clear, DPP_ATTR_BOOTSTRAP_KEY);
+ wpabuf_put_le16(clear, 2 * curve->prime_len);
+ if (dpp_test_gen_invalid_key(clear, curve) < 0)
+ goto fail;
+ goto skip_bootstrap_key;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* A in Bootstrap Key attribute */
+ wpabuf_put_le16(clear, DPP_ATTR_BOOTSTRAP_KEY);
+ wpabuf_put_le16(clear, wpabuf_len(A_pub));
+ wpabuf_put_buf(clear, A_pub);
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_bootstrap_key:
+ if (dpp_test == DPP_TEST_NO_I_AUTH_TAG_PKEX_CR_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no I-Auth tag");
+ goto skip_i_auth_tag;
+ }
+ if (dpp_test == DPP_TEST_I_AUTH_TAG_MISMATCH_PKEX_CR_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - I-Auth tag mismatch");
+ wpabuf_put_le16(clear, DPP_ATTR_I_AUTH_TAG);
+ wpabuf_put_le16(clear, curve->hash_len);
+ wpabuf_put_data(clear, u, curve->hash_len - 1);
+ wpabuf_put_u8(clear, u[curve->hash_len - 1] ^ 0x01);
+ goto skip_i_auth_tag;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* u in I-Auth tag attribute */
+ wpabuf_put_le16(clear, DPP_ATTR_I_AUTH_TAG);
+ wpabuf_put_le16(clear, curve->hash_len);
+ wpabuf_put_data(clear, u, curve->hash_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_i_auth_tag:
+ if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_PKEX_CR_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
+ goto skip_wrapped_data;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ addr[0] = wpabuf_head_u8(msg) + 2;
+ len[0] = DPP_HDR_LEN;
+ octet = 0;
+ addr[1] = &octet;
+ len[1] = sizeof(octet);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+
+ wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
+ wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
+ wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
+
+ wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
+ if (aes_siv_encrypt(pkex->z, curve->hash_len,
+ wpabuf_head(clear), wpabuf_len(clear),
+ 2, addr, len, wrapped) < 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_REQ) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
+ dpp_build_attr_status(msg, DPP_STATUS_OK);
+ }
+skip_wrapped_data:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+out:
+ wpabuf_free(clear);
+ return msg;
+
+fail:
+ wpabuf_free(msg);
+ msg = NULL;
+ goto out;
+}
+
+
+struct wpabuf * dpp_pkex_rx_exchange_resp(struct dpp_pkex *pkex,
+ const u8 *peer_mac,
+ const u8 *buf, size_t buflen)
+{
+ const u8 *attr_status, *attr_id, *attr_key, *attr_group;
+ u16 attr_status_len, attr_id_len, attr_key_len, attr_group_len;
+ const EC_GROUP *group;
+ BN_CTX *bnctx = NULL;
+ struct wpabuf *msg = NULL, *A_pub = NULL, *X_pub = NULL, *Y_pub = NULL;
+ const struct dpp_curve_params *curve = pkex->own_bi->curve;
+ EC_POINT *Qr = NULL, *Y = NULL, *N = NULL;
+ BIGNUM *Nx = NULL, *Ny = NULL;
+ EVP_PKEY_CTX *ctx = NULL;
+ EC_KEY *Y_ec = NULL;
+ size_t Jx_len, Kx_len;
+ u8 Jx[DPP_MAX_SHARED_SECRET_LEN], Kx[DPP_MAX_SHARED_SECRET_LEN];
+ const u8 *addr[4];
+ size_t len[4];
+ u8 u[DPP_MAX_HASH_LEN];
+ int res;
+
+ if (pkex->failed || pkex->t >= PKEX_COUNTER_T_LIMIT || !pkex->initiator)
+ return NULL;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_STOP_AT_PKEX_EXCHANGE_RESP) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - stop at PKEX Exchange Response");
+ pkex->failed = 1;
+ return NULL;
+ }
+
+ if (!is_zero_ether_addr(dpp_pkex_peer_mac_override)) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - peer_mac override " MACSTR,
+ MAC2STR(dpp_pkex_peer_mac_override));
+ peer_mac = dpp_pkex_peer_mac_override;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ os_memcpy(pkex->peer_mac, peer_mac, ETH_ALEN);
+
+ attr_status = dpp_get_attr(buf, buflen, DPP_ATTR_STATUS,
+ &attr_status_len);
+ if (!attr_status || attr_status_len != 1) {
+ dpp_pkex_fail(pkex, "No DPP Status attribute");
+ return NULL;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: Status %u", attr_status[0]);
+
+ if (attr_status[0] == DPP_STATUS_BAD_GROUP) {
+ attr_group = dpp_get_attr(buf, buflen,
+ DPP_ATTR_FINITE_CYCLIC_GROUP,
+ &attr_group_len);
+ if (attr_group && attr_group_len == 2) {
+ wpa_msg(pkex->msg_ctx, MSG_INFO, DPP_EVENT_FAIL
+ "Peer indicated mismatching PKEX group - proposed %u",
+ WPA_GET_LE16(attr_group));
+ return NULL;
+ }
+ }
+
+ if (attr_status[0] != DPP_STATUS_OK) {
+ dpp_pkex_fail(pkex, "PKEX failed (peer indicated failure)");
+ return NULL;
+ }
+
+ attr_id_len = 0;
+ attr_id = dpp_get_attr(buf, buflen, DPP_ATTR_CODE_IDENTIFIER,
+ &attr_id_len);
+ if (!dpp_pkex_identifier_match(attr_id, attr_id_len,
+ pkex->identifier)) {
+ dpp_pkex_fail(pkex, "PKEX code identifier mismatch");
+ return NULL;
+ }
+
+ /* N in Encrypted Key attribute */
+ attr_key = dpp_get_attr(buf, buflen, DPP_ATTR_ENCRYPTED_KEY,
+ &attr_key_len);
+ if (!attr_key || attr_key_len & 0x01 || attr_key_len < 2) {
+ dpp_pkex_fail(pkex, "Missing Encrypted Key attribute");
+ return NULL;
+ }
+
+ /* Qr = H(MAC-Responder | [identifier |] code) * Pr */
+ bnctx = BN_CTX_new();
+ if (!bnctx)
+ goto fail;
+ Qr = dpp_pkex_derive_Qr(curve, pkex->peer_mac, pkex->code,
+ pkex->identifier, bnctx, &group);
+ if (!Qr)
+ goto fail;
+
+ /* Y' = N - Qr */
+ Y = EC_POINT_new(group);
+ N = EC_POINT_new(group);
+ Nx = BN_bin2bn(attr_key, attr_key_len / 2, NULL);
+ Ny = BN_bin2bn(attr_key + attr_key_len / 2, attr_key_len / 2, NULL);
+ if (!Y || !N || !Nx || !Ny ||
+ EC_POINT_set_affine_coordinates_GFp(group, N, Nx, Ny, bnctx) != 1 ||
+ EC_POINT_is_at_infinity(group, N) ||
+ !EC_POINT_is_on_curve(group, N, bnctx) ||
+ EC_POINT_invert(group, Qr, bnctx) != 1 ||
+ EC_POINT_add(group, Y, N, Qr, bnctx) != 1 ||
+ EC_POINT_is_at_infinity(group, Y) ||
+ !EC_POINT_is_on_curve(group, Y, bnctx)) {
+ dpp_pkex_fail(pkex, "Invalid Encrypted Key value");
+ pkex->t++;
+ goto fail;
+ }
+ dpp_debug_print_point("DPP: N", group, N);
+ dpp_debug_print_point("DPP: Y'", group, Y);
+
+ pkex->exchange_done = 1;
+
+ /* ECDH: J = a * Y’ */
+ Y_ec = EC_KEY_new();
+ if (!Y_ec ||
+ EC_KEY_set_group(Y_ec, group) != 1 ||
+ EC_KEY_set_public_key(Y_ec, Y) != 1)
+ goto fail;
+ pkex->y = EVP_PKEY_new();
+ if (!pkex->y ||
+ EVP_PKEY_set1_EC_KEY(pkex->y, Y_ec) != 1)
+ goto fail;
+ ctx = EVP_PKEY_CTX_new(pkex->own_bi->pubkey, NULL);
+ if (!ctx ||
+ EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, pkex->y) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &Jx_len) != 1 ||
+ Jx_len > DPP_MAX_SHARED_SECRET_LEN ||
+ EVP_PKEY_derive(ctx, Jx, &Jx_len) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to derive ECDH shared secret: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (J.x)",
+ Jx, Jx_len);
+
+ /* u = HMAC(J.x, MAC-Initiator | A.x | Y’.x | X.x ) */
+ A_pub = dpp_get_pubkey_point(pkex->own_bi->pubkey, 0);
+ Y_pub = dpp_get_pubkey_point(pkex->y, 0);
+ X_pub = dpp_get_pubkey_point(pkex->x, 0);
+ if (!A_pub || !Y_pub || !X_pub)
+ goto fail;
+ addr[0] = pkex->own_mac;
+ len[0] = ETH_ALEN;
+ addr[1] = wpabuf_head(A_pub);
+ len[1] = wpabuf_len(A_pub) / 2;
+ addr[2] = wpabuf_head(Y_pub);
+ len[2] = wpabuf_len(Y_pub) / 2;
+ addr[3] = wpabuf_head(X_pub);
+ len[3] = wpabuf_len(X_pub) / 2;
+ if (dpp_hmac_vector(curve->hash_len, Jx, Jx_len, 4, addr, len, u) < 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: u", u, curve->hash_len);
+
+ /* K = x * Y’ */
+ EVP_PKEY_CTX_free(ctx);
+ ctx = EVP_PKEY_CTX_new(pkex->x, NULL);
+ if (!ctx ||
+ EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, pkex->y) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &Kx_len) != 1 ||
+ Kx_len > DPP_MAX_SHARED_SECRET_LEN ||
+ EVP_PKEY_derive(ctx, Kx, &Kx_len) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to derive ECDH shared secret: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (K.x)",
+ Kx, Kx_len);
+
+ /* z = HKDF(<>, MAC-Initiator | MAC-Responder | M.x | N.x | code, K.x)
+ */
+ res = dpp_pkex_derive_z(pkex->own_mac, pkex->peer_mac,
+ pkex->Mx, curve->prime_len,
+ attr_key /* N.x */, attr_key_len / 2,
+ pkex->code, Kx, Kx_len,
+ pkex->z, curve->hash_len);
+ os_memset(Kx, 0, Kx_len);
+ if (res < 0)
+ goto fail;
+
+ msg = dpp_pkex_build_commit_reveal_req(pkex, A_pub, u);
+ if (!msg)
+ goto fail;
+
+out:
+ wpabuf_free(A_pub);
+ wpabuf_free(X_pub);
+ wpabuf_free(Y_pub);
+ EC_POINT_free(Qr);
+ EC_POINT_free(Y);
+ EC_POINT_free(N);
+ BN_free(Nx);
+ BN_free(Ny);
+ EC_KEY_free(Y_ec);
+ EVP_PKEY_CTX_free(ctx);
+ BN_CTX_free(bnctx);
+ return msg;
+fail:
+ wpa_printf(MSG_DEBUG, "DPP: PKEX Exchange Response processing failed");
+ goto out;
+}
+
+
+static struct wpabuf *
+dpp_pkex_build_commit_reveal_resp(struct dpp_pkex *pkex,
+ const struct wpabuf *B_pub, const u8 *v)
+{
+ const struct dpp_curve_params *curve = pkex->own_bi->curve;
+ struct wpabuf *msg = NULL;
+ const u8 *addr[2];
+ size_t len[2];
+ u8 octet;
+ u8 *wrapped;
+ struct wpabuf *clear = NULL;
+ size_t clear_len, attr_len;
+
+ /* {B, v [bootstrapping info]}z */
+ clear_len = 4 + 2 * curve->prime_len + 4 + curve->hash_len;
+ clear = wpabuf_alloc(clear_len);
+ attr_len = 4 + clear_len + AES_BLOCK_SIZE;
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_RESP)
+ attr_len += 5;
+#endif /* CONFIG_TESTING_OPTIONS */
+ msg = dpp_alloc_msg(DPP_PA_PKEX_COMMIT_REVEAL_RESP, attr_len);
+ if (!clear || !msg)
+ goto fail;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_NO_BOOTSTRAP_KEY_PKEX_CR_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Bootstrap Key");
+ goto skip_bootstrap_key;
+ }
+ if (dpp_test == DPP_TEST_INVALID_BOOTSTRAP_KEY_PKEX_CR_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - invalid Bootstrap Key");
+ wpabuf_put_le16(clear, DPP_ATTR_BOOTSTRAP_KEY);
+ wpabuf_put_le16(clear, 2 * curve->prime_len);
+ if (dpp_test_gen_invalid_key(clear, curve) < 0)
+ goto fail;
+ goto skip_bootstrap_key;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* B in Bootstrap Key attribute */
+ wpabuf_put_le16(clear, DPP_ATTR_BOOTSTRAP_KEY);
+ wpabuf_put_le16(clear, wpabuf_len(B_pub));
+ wpabuf_put_buf(clear, B_pub);
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_bootstrap_key:
+ if (dpp_test == DPP_TEST_NO_R_AUTH_TAG_PKEX_CR_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no R-Auth tag");
+ goto skip_r_auth_tag;
+ }
+ if (dpp_test == DPP_TEST_R_AUTH_TAG_MISMATCH_PKEX_CR_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - R-Auth tag mismatch");
+ wpabuf_put_le16(clear, DPP_ATTR_R_AUTH_TAG);
+ wpabuf_put_le16(clear, curve->hash_len);
+ wpabuf_put_data(clear, v, curve->hash_len - 1);
+ wpabuf_put_u8(clear, v[curve->hash_len - 1] ^ 0x01);
+ goto skip_r_auth_tag;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ /* v in R-Auth tag attribute */
+ wpabuf_put_le16(clear, DPP_ATTR_R_AUTH_TAG);
+ wpabuf_put_le16(clear, curve->hash_len);
+ wpabuf_put_data(clear, v, curve->hash_len);
+
+#ifdef CONFIG_TESTING_OPTIONS
+skip_r_auth_tag:
+ if (dpp_test == DPP_TEST_NO_WRAPPED_DATA_PKEX_CR_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - no Wrapped Data");
+ goto skip_wrapped_data;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ addr[0] = wpabuf_head_u8(msg) + 2;
+ len[0] = DPP_HDR_LEN;
+ octet = 1;
+ addr[1] = &octet;
+ len[1] = sizeof(octet);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+
+ wpabuf_put_le16(msg, DPP_ATTR_WRAPPED_DATA);
+ wpabuf_put_le16(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
+ wrapped = wpabuf_put(msg, wpabuf_len(clear) + AES_BLOCK_SIZE);
+
+ wpa_hexdump_buf(MSG_DEBUG, "DPP: AES-SIV cleartext", clear);
+ if (aes_siv_encrypt(pkex->z, curve->hash_len,
+ wpabuf_head(clear), wpabuf_len(clear),
+ 2, addr, len, wrapped) < 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped, wpabuf_len(clear) + AES_BLOCK_SIZE);
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_AFTER_WRAPPED_DATA_PKEX_CR_RESP) {
+ wpa_printf(MSG_INFO, "DPP: TESTING - attr after Wrapped Data");
+ dpp_build_attr_status(msg, DPP_STATUS_OK);
+ }
+skip_wrapped_data:
+#endif /* CONFIG_TESTING_OPTIONS */
+
+out:
+ wpabuf_free(clear);
+ return msg;
+
+fail:
+ wpabuf_free(msg);
+ msg = NULL;
+ goto out;
+}
+
+
+struct wpabuf * dpp_pkex_rx_commit_reveal_req(struct dpp_pkex *pkex,
+ const u8 *hdr,
+ const u8 *buf, size_t buflen)
+{
+ const struct dpp_curve_params *curve = pkex->own_bi->curve;
+ EVP_PKEY_CTX *ctx = NULL;
+ size_t Jx_len, Lx_len;
+ u8 Jx[DPP_MAX_SHARED_SECRET_LEN];
+ u8 Lx[DPP_MAX_SHARED_SECRET_LEN];
+ const u8 *wrapped_data, *b_key, *peer_u;
+ u16 wrapped_data_len, b_key_len, peer_u_len = 0;
+ const u8 *addr[4];
+ size_t len[4];
+ u8 octet;
+ u8 *unwrapped = NULL;
+ size_t unwrapped_len = 0;
+ struct wpabuf *msg = NULL, *A_pub = NULL, *X_pub = NULL, *Y_pub = NULL;
+ struct wpabuf *B_pub = NULL;
+ u8 u[DPP_MAX_HASH_LEN], v[DPP_MAX_HASH_LEN];
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_STOP_AT_PKEX_CR_REQ) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - stop at PKEX CR Request");
+ pkex->failed = 1;
+ return NULL;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ if (!pkex->exchange_done || pkex->failed ||
+ pkex->t >= PKEX_COUNTER_T_LIMIT || pkex->initiator)
+ goto fail;
+
+ wrapped_data = dpp_get_attr(buf, buflen, DPP_ATTR_WRAPPED_DATA,
+ &wrapped_data_len);
+ if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
+ dpp_pkex_fail(pkex,
+ "Missing or invalid required Wrapped Data attribute");
+ goto fail;
+ }
+
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped_data, wrapped_data_len);
+ unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
+ unwrapped = os_malloc(unwrapped_len);
+ if (!unwrapped)
+ goto fail;
+
+ addr[0] = hdr;
+ len[0] = DPP_HDR_LEN;
+ octet = 0;
+ addr[1] = &octet;
+ len[1] = sizeof(octet);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+
+ if (aes_siv_decrypt(pkex->z, curve->hash_len,
+ wrapped_data, wrapped_data_len,
+ 2, addr, len, unwrapped) < 0) {
+ dpp_pkex_fail(pkex,
+ "AES-SIV decryption failed - possible PKEX code mismatch");
+ pkex->failed = 1;
+ pkex->t++;
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
+ unwrapped, unwrapped_len);
+
+ if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
+ dpp_pkex_fail(pkex, "Invalid attribute in unwrapped data");
+ goto fail;
+ }
+
+ b_key = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_BOOTSTRAP_KEY,
+ &b_key_len);
+ if (!b_key || b_key_len != 2 * curve->prime_len) {
+ dpp_pkex_fail(pkex, "No valid peer bootstrapping key found");
+ goto fail;
+ }
+ pkex->peer_bootstrap_key = dpp_set_pubkey_point(pkex->x, b_key,
+ b_key_len);
+ if (!pkex->peer_bootstrap_key) {
+ dpp_pkex_fail(pkex, "Peer bootstrapping key is invalid");
+ goto fail;
+ }
+ dpp_debug_print_key("DPP: Peer bootstrap public key",
+ pkex->peer_bootstrap_key);
+
+ /* ECDH: J' = y * A' */
+ ctx = EVP_PKEY_CTX_new(pkex->y, NULL);
+ if (!ctx ||
+ EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, pkex->peer_bootstrap_key) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &Jx_len) != 1 ||
+ Jx_len > DPP_MAX_SHARED_SECRET_LEN ||
+ EVP_PKEY_derive(ctx, Jx, &Jx_len) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to derive ECDH shared secret: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (J.x)",
+ Jx, Jx_len);
+
+ /* u' = HMAC(J'.x, MAC-Initiator | A'.x | Y.x | X'.x) */
+ A_pub = dpp_get_pubkey_point(pkex->peer_bootstrap_key, 0);
+ Y_pub = dpp_get_pubkey_point(pkex->y, 0);
+ X_pub = dpp_get_pubkey_point(pkex->x, 0);
+ if (!A_pub || !Y_pub || !X_pub)
+ goto fail;
+ addr[0] = pkex->peer_mac;
+ len[0] = ETH_ALEN;
+ addr[1] = wpabuf_head(A_pub);
+ len[1] = wpabuf_len(A_pub) / 2;
+ addr[2] = wpabuf_head(Y_pub);
+ len[2] = wpabuf_len(Y_pub) / 2;
+ addr[3] = wpabuf_head(X_pub);
+ len[3] = wpabuf_len(X_pub) / 2;
+ if (dpp_hmac_vector(curve->hash_len, Jx, Jx_len, 4, addr, len, u) < 0)
+ goto fail;
+
+ peer_u = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_I_AUTH_TAG,
+ &peer_u_len);
+ if (!peer_u || peer_u_len != curve->hash_len ||
+ os_memcmp(peer_u, u, curve->hash_len) != 0) {
+ dpp_pkex_fail(pkex, "No valid u (I-Auth tag) found");
+ wpa_hexdump(MSG_DEBUG, "DPP: Calculated u'",
+ u, curve->hash_len);
+ wpa_hexdump(MSG_DEBUG, "DPP: Received u", peer_u, peer_u_len);
+ pkex->t++;
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: Valid u (I-Auth tag) received");
+
+ /* ECDH: L = b * X' */
+ EVP_PKEY_CTX_free(ctx);
+ ctx = EVP_PKEY_CTX_new(pkex->own_bi->pubkey, NULL);
+ if (!ctx ||
+ EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, pkex->x) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &Lx_len) != 1 ||
+ Lx_len > DPP_MAX_SHARED_SECRET_LEN ||
+ EVP_PKEY_derive(ctx, Lx, &Lx_len) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to derive ECDH shared secret: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (L.x)",
+ Lx, Lx_len);
+
+ /* v = HMAC(L.x, MAC-Responder | B.x | X'.x | Y.x) */
+ B_pub = dpp_get_pubkey_point(pkex->own_bi->pubkey, 0);
+ if (!B_pub)
+ goto fail;
+ addr[0] = pkex->own_mac;
+ len[0] = ETH_ALEN;
+ addr[1] = wpabuf_head(B_pub);
+ len[1] = wpabuf_len(B_pub) / 2;
+ addr[2] = wpabuf_head(X_pub);
+ len[2] = wpabuf_len(X_pub) / 2;
+ addr[3] = wpabuf_head(Y_pub);
+ len[3] = wpabuf_len(Y_pub) / 2;
+ if (dpp_hmac_vector(curve->hash_len, Lx, Lx_len, 4, addr, len, v) < 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: v", v, curve->hash_len);
+
+ msg = dpp_pkex_build_commit_reveal_resp(pkex, B_pub, v);
+ if (!msg)
+ goto fail;
+
+out:
+ EVP_PKEY_CTX_free(ctx);
+ os_free(unwrapped);
+ wpabuf_free(A_pub);
+ wpabuf_free(B_pub);
+ wpabuf_free(X_pub);
+ wpabuf_free(Y_pub);
+ return msg;
+fail:
+ wpa_printf(MSG_DEBUG,
+ "DPP: PKEX Commit-Reveal Request processing failed");
+ goto out;
+}
+
+
+int dpp_pkex_rx_commit_reveal_resp(struct dpp_pkex *pkex, const u8 *hdr,
+ const u8 *buf, size_t buflen)
+{
+ const struct dpp_curve_params *curve = pkex->own_bi->curve;
+ const u8 *wrapped_data, *b_key, *peer_v;
+ u16 wrapped_data_len, b_key_len, peer_v_len = 0;
+ const u8 *addr[4];
+ size_t len[4];
+ u8 octet;
+ u8 *unwrapped = NULL;
+ size_t unwrapped_len = 0;
+ int ret = -1;
+ u8 v[DPP_MAX_HASH_LEN];
+ size_t Lx_len;
+ u8 Lx[DPP_MAX_SHARED_SECRET_LEN];
+ EVP_PKEY_CTX *ctx = NULL;
+ struct wpabuf *B_pub = NULL, *X_pub = NULL, *Y_pub = NULL;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ if (dpp_test == DPP_TEST_STOP_AT_PKEX_CR_RESP) {
+ wpa_printf(MSG_INFO,
+ "DPP: TESTING - stop at PKEX CR Response");
+ pkex->failed = 1;
+ goto fail;
+ }
+#endif /* CONFIG_TESTING_OPTIONS */
+
+ if (!pkex->exchange_done || pkex->failed ||
+ pkex->t >= PKEX_COUNTER_T_LIMIT || !pkex->initiator)
+ goto fail;
+
+ wrapped_data = dpp_get_attr(buf, buflen, DPP_ATTR_WRAPPED_DATA,
+ &wrapped_data_len);
+ if (!wrapped_data || wrapped_data_len < AES_BLOCK_SIZE) {
+ dpp_pkex_fail(pkex,
+ "Missing or invalid required Wrapped Data attribute");
+ goto fail;
+ }
+
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV ciphertext",
+ wrapped_data, wrapped_data_len);
+ unwrapped_len = wrapped_data_len - AES_BLOCK_SIZE;
+ unwrapped = os_malloc(unwrapped_len);
+ if (!unwrapped)
+ goto fail;
+
+ addr[0] = hdr;
+ len[0] = DPP_HDR_LEN;
+ octet = 1;
+ addr[1] = &octet;
+ len[1] = sizeof(octet);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[0]", addr[0], len[0]);
+ wpa_hexdump(MSG_DEBUG, "DDP: AES-SIV AD[1]", addr[1], len[1]);
+
+ if (aes_siv_decrypt(pkex->z, curve->hash_len,
+ wrapped_data, wrapped_data_len,
+ 2, addr, len, unwrapped) < 0) {
+ dpp_pkex_fail(pkex,
+ "AES-SIV decryption failed - possible PKEX code mismatch");
+ pkex->t++;
+ goto fail;
+ }
+ wpa_hexdump(MSG_DEBUG, "DPP: AES-SIV cleartext",
+ unwrapped, unwrapped_len);
+
+ if (dpp_check_attrs(unwrapped, unwrapped_len) < 0) {
+ dpp_pkex_fail(pkex, "Invalid attribute in unwrapped data");
+ goto fail;
+ }
+
+ b_key = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_BOOTSTRAP_KEY,
+ &b_key_len);
+ if (!b_key || b_key_len != 2 * curve->prime_len) {
+ dpp_pkex_fail(pkex, "No valid peer bootstrapping key found");
+ goto fail;
+ }
+ pkex->peer_bootstrap_key = dpp_set_pubkey_point(pkex->x, b_key,
+ b_key_len);
+ if (!pkex->peer_bootstrap_key) {
+ dpp_pkex_fail(pkex, "Peer bootstrapping key is invalid");
+ goto fail;
+ }
+ dpp_debug_print_key("DPP: Peer bootstrap public key",
+ pkex->peer_bootstrap_key);
+
+ /* ECDH: L' = x * B' */
+ ctx = EVP_PKEY_CTX_new(pkex->x, NULL);
+ if (!ctx ||
+ EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, pkex->peer_bootstrap_key) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &Lx_len) != 1 ||
+ Lx_len > DPP_MAX_SHARED_SECRET_LEN ||
+ EVP_PKEY_derive(ctx, Lx, &Lx_len) != 1) {
+ wpa_printf(MSG_ERROR,
+ "DPP: Failed to derive ECDH shared secret: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+ goto fail;
+ }
+
+ wpa_hexdump_key(MSG_DEBUG, "DPP: ECDH shared secret (L.x)",
+ Lx, Lx_len);
+
+ /* v' = HMAC(L.x, MAC-Responder | B'.x | X.x | Y'.x) */
+ B_pub = dpp_get_pubkey_point(pkex->peer_bootstrap_key, 0);
+ X_pub = dpp_get_pubkey_point(pkex->x, 0);
+ Y_pub = dpp_get_pubkey_point(pkex->y, 0);
+ if (!B_pub || !X_pub || !Y_pub)
+ goto fail;
+ addr[0] = pkex->peer_mac;
+ len[0] = ETH_ALEN;
+ addr[1] = wpabuf_head(B_pub);
+ len[1] = wpabuf_len(B_pub) / 2;
+ addr[2] = wpabuf_head(X_pub);
+ len[2] = wpabuf_len(X_pub) / 2;
+ addr[3] = wpabuf_head(Y_pub);
+ len[3] = wpabuf_len(Y_pub) / 2;
+ if (dpp_hmac_vector(curve->hash_len, Lx, Lx_len, 4, addr, len, v) < 0)
+ goto fail;
+
+ peer_v = dpp_get_attr(unwrapped, unwrapped_len, DPP_ATTR_R_AUTH_TAG,
+ &peer_v_len);
+ if (!peer_v || peer_v_len != curve->hash_len ||
+ os_memcmp(peer_v, v, curve->hash_len) != 0) {
+ dpp_pkex_fail(pkex, "No valid v (R-Auth tag) found");
+ wpa_hexdump(MSG_DEBUG, "DPP: Calculated v'",
+ v, curve->hash_len);
+ wpa_hexdump(MSG_DEBUG, "DPP: Received v", peer_v, peer_v_len);
+ pkex->t++;
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "DPP: Valid v (R-Auth tag) received");
+
+ ret = 0;
+out:
+ wpabuf_free(B_pub);
+ wpabuf_free(X_pub);
+ wpabuf_free(Y_pub);
+ EVP_PKEY_CTX_free(ctx);
+ os_free(unwrapped);
+ return ret;
+fail:
+ goto out;
+}
+
+
+void dpp_pkex_free(struct dpp_pkex *pkex)
+{
+ if (!pkex)
+ return;
+
+ os_free(pkex->identifier);
+ os_free(pkex->code);
+ EVP_PKEY_free(pkex->x);
+ EVP_PKEY_free(pkex->y);
+ EVP_PKEY_free(pkex->peer_bootstrap_key);
+ wpabuf_free(pkex->exchange_req);
+ wpabuf_free(pkex->exchange_resp);
+ os_free(pkex);
+}
+
+
+#ifdef CONFIG_TESTING_OPTIONS
+char * dpp_corrupt_connector_signature(const char *connector)
+{
+ char *tmp, *pos, *signed3 = NULL;
+ unsigned char *signature = NULL;
+ size_t signature_len = 0, signed3_len;
+
+ tmp = os_zalloc(os_strlen(connector) + 5);
+ if (!tmp)
+ goto fail;
+ os_memcpy(tmp, connector, os_strlen(connector));
+
+ pos = os_strchr(tmp, '.');
+ if (!pos)
+ goto fail;
+
+ pos = os_strchr(pos + 1, '.');
+ if (!pos)
+ goto fail;
+ pos++;
+
+ wpa_printf(MSG_DEBUG, "DPP: Original base64url encoded signature: %s",
+ pos);
+ signature = base64_url_decode((const unsigned char *) pos,
+ os_strlen(pos), &signature_len);
+ if (!signature || signature_len == 0)
+ goto fail;
+ wpa_hexdump(MSG_DEBUG, "DPP: Original Connector signature",
+ signature, signature_len);
+ signature[signature_len - 1] ^= 0x01;
+ wpa_hexdump(MSG_DEBUG, "DPP: Corrupted Connector signature",
+ signature, signature_len);
+ signed3 = (char *) base64_url_encode(signature, signature_len,
+ &signed3_len, 0);
+ if (!signed3)
+ goto fail;
+ os_memcpy(pos, signed3, signed3_len);
+ pos[signed3_len] = '\0';
+ wpa_printf(MSG_DEBUG, "DPP: Corrupted base64url encoded signature: %s",
+ pos);
+
+out:
+ os_free(signature);
+ os_free(signed3);
+ return tmp;
+fail:
+ os_free(tmp);
+ tmp = NULL;
+ goto out;
+}
+#endif /* CONFIG_TESTING_OPTIONS */
generated by cgit v1.3 (git 2.53.0) at 2026-05-14 03:35:39 +0000