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Diffstat (limited to 'contrib/hostapd/eap_sim_common.c')
-rw-r--r--contrib/hostapd/eap_sim_common.c788
1 files changed, 788 insertions, 0 deletions
diff --git a/contrib/hostapd/eap_sim_common.c b/contrib/hostapd/eap_sim_common.c
new file mode 100644
index 0000000000000..98f4fb7d30141
--- /dev/null
+++ b/contrib/hostapd/eap_sim_common.c
@@ -0,0 +1,788 @@
+/*
+ * WPA Supplicant / EAP-SIM/AKA shared routines
+ * Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "common.h"
+#include "eap_i.h"
+#include "sha1.h"
+#include "aes_wrap.h"
+#include "eap_sim_common.h"
+
+
+#define MSK_LEN 8
+#define EMSK_LEN 8
+
+
+static void eap_sim_prf(const u8 *key, u8 *x, size_t xlen)
+{
+ u8 xkey[64];
+ u32 t[5], _t[5];
+ int i, j, m, k;
+ u8 *xpos = x;
+ u32 carry;
+
+ /* FIPS 186-2 + change notice 1 */
+
+ memcpy(xkey, key, EAP_SIM_MK_LEN);
+ memset(xkey + EAP_SIM_MK_LEN, 0, 64 - EAP_SIM_MK_LEN);
+ t[0] = 0x67452301;
+ t[1] = 0xEFCDAB89;
+ t[2] = 0x98BADCFE;
+ t[3] = 0x10325476;
+ t[4] = 0xC3D2E1F0;
+
+ m = xlen / 40;
+ for (j = 0; j < m; j++) {
+ /* XSEED_j = 0 */
+ for (i = 0; i < 2; i++) {
+ /* XVAL = (XKEY + XSEED_j) mod 2^b */
+
+ /* w_i = G(t, XVAL) */
+ memcpy(_t, t, 20);
+ sha1_transform((u8 *) _t, xkey);
+ _t[0] = host_to_be32(_t[0]);
+ _t[1] = host_to_be32(_t[1]);
+ _t[2] = host_to_be32(_t[2]);
+ _t[3] = host_to_be32(_t[3]);
+ _t[4] = host_to_be32(_t[4]);
+ memcpy(xpos, _t, 20);
+
+ /* XKEY = (1 + XKEY + w_i) mod 2^b */
+ carry = 1;
+ for (k = 19; k >= 0; k--) {
+ carry += xkey[k] + xpos[k];
+ xkey[k] = carry & 0xff;
+ carry >>= 8;
+ }
+
+ xpos += SHA1_MAC_LEN;
+ }
+ /* x_j = w_0|w_1 */
+ }
+}
+
+
+void eap_sim_derive_keys(const u8 *mk, u8 *k_encr, u8 *k_aut, u8 *msk)
+{
+ u8 buf[120], *pos;
+ eap_sim_prf(mk, buf, 120);
+ pos = buf;
+ memcpy(k_encr, pos, EAP_SIM_K_ENCR_LEN);
+ pos += EAP_SIM_K_ENCR_LEN;
+ memcpy(k_aut, pos, EAP_SIM_K_AUT_LEN);
+ pos += EAP_SIM_K_AUT_LEN;
+ memcpy(msk, pos, EAP_SIM_KEYING_DATA_LEN);
+ pos += MSK_LEN;
+
+ wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: K_encr",
+ k_encr, EAP_SIM_K_ENCR_LEN);
+ wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: K_aut",
+ k_aut, EAP_SIM_K_ENCR_LEN);
+ wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: MSK",
+ msk, MSK_LEN);
+ wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Ext. MSK",
+ msk + MSK_LEN, EMSK_LEN);
+ wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: keying material",
+ msk, EAP_SIM_KEYING_DATA_LEN);
+}
+
+
+void eap_sim_derive_keys_reauth(unsigned int _counter,
+ const u8 *identity, size_t identity_len,
+ const u8 *nonce_s, const u8 *mk, u8 *msk)
+{
+ u8 xkey[SHA1_MAC_LEN];
+ u8 counter[2];
+ const u8 *addr[4];
+ size_t len[4];
+
+ addr[0] = identity;
+ len[0] = identity_len;
+ addr[1] = counter;
+ len[1] = 2;
+ addr[2] = nonce_s;
+ len[2] = EAP_SIM_NONCE_S_LEN;
+ addr[3] = mk;
+ len[3] = EAP_SIM_MK_LEN;
+
+ counter[0] = _counter >> 8;
+ counter[1] = _counter & 0xff;
+
+ wpa_printf(MSG_DEBUG, "EAP-SIM: Deriving keying data from reauth");
+ wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Identity",
+ identity, identity_len);
+ wpa_hexdump(MSG_DEBUG, "EAP-SIM: counter", counter, 2);
+ wpa_hexdump(MSG_DEBUG, "EAP-SIM: NONCE_S", nonce_s,
+ EAP_SIM_NONCE_S_LEN);
+ wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: MK", mk, EAP_SIM_MK_LEN);
+
+ /* XKEY' = SHA1(Identity|counter|NONCE_S|MK) */
+ sha1_vector(4, addr, len, xkey);
+ wpa_hexdump(MSG_DEBUG, "EAP-SIM: XKEY'", xkey, SHA1_MAC_LEN);
+
+ eap_sim_prf(xkey, msk, EAP_SIM_KEYING_DATA_LEN);
+ wpa_hexdump(MSG_DEBUG, "EAP-SIM: MSK", msk, MSK_LEN);
+ wpa_hexdump(MSG_DEBUG, "EAP-SIM: Ext. MSK", msk + MSK_LEN, EMSK_LEN);
+ wpa_hexdump(MSG_DEBUG, "EAP-SIM: keying material",
+ msk, EAP_SIM_KEYING_DATA_LEN);
+}
+
+
+int eap_sim_verify_mac(const u8 *k_aut, u8 *req, size_t req_len, u8 *mac,
+ u8 *extra, size_t extra_len)
+{
+ unsigned char hmac[SHA1_MAC_LEN];
+ const u8 *addr[2];
+ size_t len[2];
+ u8 rx_mac[EAP_SIM_MAC_LEN];
+
+ if (mac == NULL)
+ return -1;
+
+ addr[0] = req;
+ len[0] = req_len;
+ addr[1] = extra;
+ len[1] = extra_len;
+
+ /* HMAC-SHA1-128 */
+ memcpy(rx_mac, mac, EAP_SIM_MAC_LEN);
+ memset(mac, 0, EAP_SIM_MAC_LEN);
+ hmac_sha1_vector(k_aut, EAP_SIM_K_AUT_LEN, 2, addr, len, hmac);
+ memcpy(mac, rx_mac, EAP_SIM_MAC_LEN);
+
+ return (memcmp(hmac, mac, EAP_SIM_MAC_LEN) == 0) ? 0 : 1;
+}
+
+
+void eap_sim_add_mac(const u8 *k_aut, u8 *msg, size_t msg_len, u8 *mac,
+ const u8 *extra, size_t extra_len)
+{
+ unsigned char hmac[SHA1_MAC_LEN];
+ const u8 *addr[2];
+ size_t len[2];
+
+ addr[0] = msg;
+ len[0] = msg_len;
+ addr[1] = extra;
+ len[1] = extra_len;
+
+ /* HMAC-SHA1-128 */
+ memset(mac, 0, EAP_SIM_MAC_LEN);
+ hmac_sha1_vector(k_aut, EAP_SIM_K_AUT_LEN, 2, addr, len, hmac);
+ memcpy(mac, hmac, EAP_SIM_MAC_LEN);
+}
+
+
+int eap_sim_parse_attr(u8 *start, u8 *end, struct eap_sim_attrs *attr, int aka,
+ int encr)
+{
+ u8 *pos = start, *apos;
+ size_t alen, plen;
+ int list_len, i;
+
+ memset(attr, 0, sizeof(*attr));
+ attr->id_req = NO_ID_REQ;
+ attr->notification = -1;
+ attr->counter = -1;
+ attr->selected_version = -1;
+ attr->client_error_code = -1;
+
+ while (pos < end) {
+ if (pos + 2 > end) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Attribute overflow(1)");
+ return -1;
+ }
+ wpa_printf(MSG_MSGDUMP, "EAP-SIM: Attribute: Type=%d Len=%d",
+ pos[0], pos[1] * 4);
+ if (pos + pos[1] * 4 > end) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Attribute overflow "
+ "(pos=%p len=%d end=%p)",
+ pos, pos[1] * 4, end);
+ return -1;
+ }
+ apos = pos + 2;
+ alen = pos[1] * 4 - 2;
+ wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Attribute data",
+ apos, alen);
+
+ switch (pos[0]) {
+ case EAP_SIM_AT_RAND:
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_RAND");
+ apos += 2;
+ alen -= 2;
+ if ((!aka && (alen % GSM_RAND_LEN)) ||
+ (aka && alen != AKA_RAND_LEN)) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Invalid AT_RAND"
+ " (len %lu)",
+ (unsigned long) alen);
+ return -1;
+ }
+ attr->rand = apos;
+ attr->num_chal = alen / GSM_RAND_LEN;
+ break;
+ case EAP_SIM_AT_AUTN:
+ wpa_printf(MSG_DEBUG, "EAP-AKA: AT_AUTN");
+ if (!aka) {
+ wpa_printf(MSG_DEBUG, "EAP-SIM: "
+ "Unexpected AT_AUTN");
+ return -1;
+ }
+ apos += 2;
+ alen -= 2;
+ if (alen != AKA_AUTN_LEN) {
+ wpa_printf(MSG_INFO, "EAP-AKA: Invalid AT_AUTN"
+ " (len %lu)",
+ (unsigned long) alen);
+ return -1;
+ }
+ attr->autn = apos;
+ break;
+ case EAP_SIM_AT_PADDING:
+ if (!encr) {
+ wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
+ "AT_PADDING");
+ return -1;
+ }
+ wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) AT_PADDING");
+ for (i = 2; i < alen; i++) {
+ if (apos[i] != 0) {
+ wpa_printf(MSG_INFO, "EAP-SIM: (encr) "
+ "AT_PADDING used a non-zero"
+ " padding byte");
+ wpa_hexdump(MSG_DEBUG, "EAP-SIM: "
+ "(encr) padding bytes",
+ apos + 2, alen - 2);
+ return -1;
+ }
+ }
+ break;
+ case EAP_SIM_AT_NONCE_MT:
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_NONCE_MT");
+ if (alen != 2 + EAP_SIM_NONCE_MT_LEN) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
+ "AT_NONCE_MT length");
+ return -1;
+ }
+ attr->nonce_mt = apos + 2;
+ break;
+ case EAP_SIM_AT_PERMANENT_ID_REQ:
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_PERMANENT_ID_REQ");
+ attr->id_req = PERMANENT_ID;
+ break;
+ case EAP_SIM_AT_MAC:
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_MAC");
+ if (alen != 2 + EAP_SIM_MAC_LEN) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Invalid AT_MAC "
+ "length");
+ return -1;
+ }
+ attr->mac = apos + 2;
+ break;
+ case EAP_SIM_AT_NOTIFICATION:
+ if (alen != 2) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
+ "AT_NOTIFICATION length %lu",
+ (unsigned long) alen);
+ return -1;
+ }
+ attr->notification = apos[0] * 256 + apos[1];
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_NOTIFICATION %d",
+ attr->notification);
+ break;
+ case EAP_SIM_AT_ANY_ID_REQ:
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_ANY_ID_REQ");
+ attr->id_req = ANY_ID;
+ break;
+ case EAP_SIM_AT_IDENTITY:
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_IDENTITY");
+ attr->identity = apos + 2;
+ attr->identity_len = alen - 2;
+ break;
+ case EAP_SIM_AT_VERSION_LIST:
+ if (aka) {
+ wpa_printf(MSG_DEBUG, "EAP-AKA: "
+ "Unexpected AT_VERSION_LIST");
+ return -1;
+ }
+ list_len = apos[0] * 256 + apos[1];
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_VERSION_LIST");
+ if (list_len < 2 || list_len > alen - 2) {
+ wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
+ "AT_VERSION_LIST (list_len=%d "
+ "attr_len=%lu)", list_len,
+ (unsigned long) alen);
+ return -1;
+ }
+ attr->version_list = apos + 2;
+ attr->version_list_len = list_len;
+ break;
+ case EAP_SIM_AT_SELECTED_VERSION:
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_SELECTED_VERSION");
+ if (alen != 2) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
+ "AT_SELECTED_VERSION length %lu",
+ (unsigned long) alen);
+ return -1;
+ }
+ attr->selected_version = apos[0] * 256 + apos[1];
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_SELECTED_VERSION "
+ "%d", attr->selected_version);
+ break;
+ case EAP_SIM_AT_FULLAUTH_ID_REQ:
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_FULLAUTH_ID_REQ");
+ attr->id_req = FULLAUTH_ID;
+ break;
+ case EAP_SIM_AT_COUNTER:
+ if (!encr) {
+ wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
+ "AT_COUNTER");
+ return -1;
+ }
+ if (alen != 2) {
+ wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid "
+ "AT_COUNTER (alen=%lu)",
+ (unsigned long) alen);
+ return -1;
+ }
+ attr->counter = apos[0] * 256 + apos[1];
+ wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) AT_COUNTER %d",
+ attr->counter);
+ break;
+ case EAP_SIM_AT_NONCE_S:
+ if (!encr) {
+ wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
+ "AT_NONCE_S");
+ return -1;
+ }
+ wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) "
+ "AT_NONCE_S");
+ if (alen != 2 + EAP_SIM_NONCE_S_LEN) {
+ wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid "
+ "AT_NONCE_S (alen=%lu)",
+ (unsigned long) alen);
+ return -1;
+ }
+ attr->nonce_s = apos + 2;
+ break;
+ case EAP_SIM_AT_CLIENT_ERROR_CODE:
+ if (alen != 2) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
+ "AT_CLIENT_ERROR_CODE length %lu",
+ (unsigned long) alen);
+ return -1;
+ }
+ attr->client_error_code = apos[0] * 256 + apos[1];
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_CLIENT_ERROR_CODE "
+ "%d", attr->client_error_code);
+ break;
+ case EAP_SIM_AT_IV:
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_IV");
+ if (alen != 2 + EAP_SIM_MAC_LEN) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Invalid AT_IV "
+ "length %lu", (unsigned long) alen);
+ return -1;
+ }
+ attr->iv = apos + 2;
+ break;
+ case EAP_SIM_AT_ENCR_DATA:
+ wpa_printf(MSG_DEBUG, "EAP-SIM: AT_ENCR_DATA");
+ attr->encr_data = apos + 2;
+ attr->encr_data_len = alen - 2;
+ if (attr->encr_data_len % 16) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Invalid "
+ "AT_ENCR_DATA length %lu",
+ (unsigned long)
+ attr->encr_data_len);
+ return -1;
+ }
+ break;
+ case EAP_SIM_AT_NEXT_PSEUDONYM:
+ if (!encr) {
+ wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
+ "AT_NEXT_PSEUDONYM");
+ return -1;
+ }
+ wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) "
+ "AT_NEXT_PSEUDONYM");
+ plen = apos[0] * 256 + apos[1];
+ if (plen > alen - 2) {
+ wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid"
+ " AT_NEXT_PSEUDONYM (actual"
+ " len %lu, attr len %lu)",
+ (unsigned long) plen,
+ (unsigned long) alen);
+ return -1;
+ }
+ attr->next_pseudonym = pos + 4;
+ attr->next_pseudonym_len = plen;
+ break;
+ case EAP_SIM_AT_NEXT_REAUTH_ID:
+ if (!encr) {
+ wpa_printf(MSG_ERROR, "EAP-SIM: Unencrypted "
+ "AT_NEXT_REAUTH_ID");
+ return -1;
+ }
+ wpa_printf(MSG_DEBUG, "EAP-SIM: (encr) "
+ "AT_NEXT_REAUTH_ID");
+ plen = apos[0] * 256 + apos[1];
+ if (plen > alen - 2) {
+ wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid"
+ " AT_NEXT_REAUTH_ID (actual"
+ " len %lu, attr len %lu)",
+ (unsigned long) plen,
+ (unsigned long) alen);
+ return -1;
+ }
+ attr->next_reauth_id = pos + 4;
+ attr->next_reauth_id_len = plen;
+ break;
+ default:
+ if (pos[0] < 128) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Unrecognized "
+ "non-skippable attribute %d",
+ pos[0]);
+ return -1;
+ }
+
+ wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized skippable"
+ " attribute %d ignored", pos[0]);
+ break;
+ }
+
+ pos += pos[1] * 4;
+ }
+
+ wpa_printf(MSG_DEBUG, "EAP-SIM: Attributes parsed successfully "
+ "(aka=%d encr=%d)", aka, encr);
+
+ return 0;
+}
+
+
+int eap_sim_parse_encr(const u8 *k_encr, u8 *encr_data, size_t encr_data_len,
+ const u8 *iv, struct eap_sim_attrs *attr, int aka)
+{
+ if (!iv) {
+ wpa_printf(MSG_INFO, "EAP-SIM: Encrypted data, but no IV");
+ return -1;
+ }
+ aes_128_cbc_decrypt(k_encr, iv, encr_data, encr_data_len);
+ wpa_hexdump(MSG_MSGDUMP, "EAP-SIM: Decrypted AT_ENCR_DATA",
+ encr_data, encr_data_len);
+
+ if (eap_sim_parse_attr(encr_data, encr_data + encr_data_len, attr,
+ aka, 1)) {
+ wpa_printf(MSG_INFO, "EAP-SIM: (encr) Failed to parse "
+ "decrypted AT_ENCR_DATA");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+#define EAP_SIM_INIT_LEN 128
+
+struct eap_sim_msg {
+ u8 *buf;
+ size_t buf_len, used;
+ size_t mac, iv, encr; /* index from buf */
+};
+
+
+struct eap_sim_msg * eap_sim_msg_init(int code, int id, int type, int subtype)
+{
+ struct eap_sim_msg *msg;
+ struct eap_hdr *eap;
+ u8 *pos;
+
+ msg = malloc(sizeof(*msg));
+ if (msg == NULL)
+ return NULL;
+ memset(msg, 0, sizeof(*msg));
+
+ msg->buf = malloc(EAP_SIM_INIT_LEN);
+ if (msg->buf == NULL) {
+ free(msg);
+ return NULL;
+ }
+ memset(msg->buf, 0, EAP_SIM_INIT_LEN);
+ msg->buf_len = EAP_SIM_INIT_LEN;
+ eap = (struct eap_hdr *) msg->buf;
+ eap->code = code;
+ eap->identifier = id;
+ msg->used = sizeof(*eap);
+
+ pos = (u8 *) (eap + 1);
+ *pos++ = type;
+ *pos++ = subtype;
+ *pos++ = 0; /* Reserved */
+ *pos++ = 0; /* Reserved */
+ msg->used += 4;
+
+ return msg;
+}
+
+
+u8 * eap_sim_msg_finish(struct eap_sim_msg *msg, size_t *len, const u8 *k_aut,
+ const u8 *extra, size_t extra_len)
+{
+ struct eap_hdr *eap;
+ u8 *buf;
+
+ if (msg == NULL)
+ return NULL;
+
+ eap = (struct eap_hdr *) msg->buf;
+ eap->length = host_to_be16(msg->used);
+
+ if (k_aut && msg->mac) {
+ eap_sim_add_mac(k_aut, msg->buf, msg->used,
+ msg->buf + msg->mac, extra, extra_len);
+ }
+
+ *len = msg->used;
+ buf = msg->buf;
+ free(msg);
+ return buf;
+}
+
+
+void eap_sim_msg_free(struct eap_sim_msg *msg)
+{
+ if (msg) {
+ free(msg->buf);
+ free(msg);
+ }
+}
+
+
+static int eap_sim_msg_resize(struct eap_sim_msg *msg, size_t add_len)
+{
+ if (msg->used + add_len > msg->buf_len) {
+ u8 *nbuf = realloc(msg->buf, msg->used + add_len);
+ if (nbuf == NULL)
+ return -1;
+ msg->buf = nbuf;
+ msg->buf_len = msg->used + add_len;
+ }
+ return 0;
+}
+
+
+u8 * eap_sim_msg_add_full(struct eap_sim_msg *msg, u8 attr,
+ const u8 *data, size_t len)
+{
+ int attr_len = 2 + len;
+ int pad_len;
+ u8 *start, *pos;
+
+ if (msg == NULL)
+ return NULL;
+
+ pad_len = (4 - attr_len % 4) % 4;
+ attr_len += pad_len;
+ if (eap_sim_msg_resize(msg, attr_len))
+ return NULL;
+ start = pos = msg->buf + msg->used;
+ *pos++ = attr;
+ *pos++ = attr_len / 4;
+ memcpy(pos, data, len);
+ if (pad_len) {
+ pos += len;
+ memset(pos, 0, pad_len);
+ }
+ msg->used += attr_len;
+ return start;
+}
+
+
+u8 * eap_sim_msg_add(struct eap_sim_msg *msg, u8 attr, u16 value,
+ const u8 *data, size_t len)
+{
+ int attr_len = 4 + len;
+ int pad_len;
+ u8 *start, *pos;
+
+ if (msg == NULL)
+ return NULL;
+
+ pad_len = (4 - attr_len % 4) % 4;
+ attr_len += pad_len;
+ if (eap_sim_msg_resize(msg, attr_len))
+ return NULL;
+ start = pos = msg->buf + msg->used;
+ *pos++ = attr;
+ *pos++ = attr_len / 4;
+ *pos++ = value >> 8;
+ *pos++ = value & 0xff;
+ if (data)
+ memcpy(pos, data, len);
+ if (pad_len) {
+ pos += len;
+ memset(pos, 0, pad_len);
+ }
+ msg->used += attr_len;
+ return start;
+}
+
+
+u8 * eap_sim_msg_add_mac(struct eap_sim_msg *msg, u8 attr)
+{
+ u8 *pos = eap_sim_msg_add(msg, attr, 0, NULL, EAP_SIM_MAC_LEN);
+ if (pos)
+ msg->mac = (pos - msg->buf) + 4;
+ return pos;
+}
+
+
+int eap_sim_msg_add_encr_start(struct eap_sim_msg *msg, u8 attr_iv,
+ u8 attr_encr)
+{
+ u8 *pos = eap_sim_msg_add(msg, attr_iv, 0, NULL, EAP_SIM_IV_LEN);
+ if (pos == NULL)
+ return -1;
+ msg->iv = (pos - msg->buf) + 4;
+ if (hostapd_get_rand(msg->buf + msg->iv, EAP_SIM_IV_LEN)) {
+ msg->iv = 0;
+ return -1;
+ }
+
+ pos = eap_sim_msg_add(msg, attr_encr, 0, NULL, 0);
+ if (pos == NULL) {
+ msg->iv = 0;
+ return -1;
+ }
+ msg->encr = pos - msg->buf;
+
+ return 0;
+}
+
+
+int eap_sim_msg_add_encr_end(struct eap_sim_msg *msg, u8 *k_encr, int attr_pad)
+{
+ size_t encr_len;
+
+ if (k_encr == NULL || msg->iv == 0 || msg->encr == 0)
+ return -1;
+
+ encr_len = msg->used - msg->encr - 4;
+ if (encr_len % 16) {
+ u8 *pos;
+ int pad_len = 16 - (encr_len % 16);
+ if (pad_len < 4) {
+ wpa_printf(MSG_WARNING, "EAP-SIM: "
+ "eap_sim_msg_add_encr_end - invalid pad_len"
+ " %d", pad_len);
+ return -1;
+ }
+ wpa_printf(MSG_DEBUG, " *AT_PADDING");
+ pos = eap_sim_msg_add(msg, attr_pad, 0, NULL, pad_len - 4);
+ if (pos == NULL)
+ return -1;
+ memset(pos + 4, 0, pad_len - 4);
+ encr_len += pad_len;
+ }
+ wpa_printf(MSG_DEBUG, " (AT_ENCR_DATA data len %lu)",
+ (unsigned long) encr_len);
+ msg->buf[msg->encr + 1] = encr_len / 4 + 1;
+ aes_128_cbc_encrypt(k_encr, msg->buf + msg->iv,
+ msg->buf + msg->encr + 4, encr_len);
+
+ return 0;
+}
+
+
+void eap_sim_report_notification(void *msg_ctx, int notification, int aka)
+{
+ const char *type = aka ? "AKA" : "SIM";
+
+ switch (notification) {
+ case EAP_SIM_GENERAL_FAILURE_AFTER_AUTH:
+ wpa_printf(MSG_WARNING, "EAP-%s: General failure "
+ "notification (after authentication)", type);
+ break;
+ case EAP_SIM_TEMPORARILY_DENIED:
+ wpa_printf(MSG_WARNING, "EAP-%s: Failure notification: "
+ "User has been temporarily denied access to the "
+ "requested service", type);
+ break;
+ case EAP_SIM_NOT_SUBSCRIBED:
+ wpa_printf(MSG_WARNING, "EAP-%s: Failure notification: "
+ "User has not subscribed to the requested service",
+ type);
+ break;
+ case EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH:
+ wpa_printf(MSG_WARNING, "EAP-%s: General failure "
+ "notification (before authentication)", type);
+ break;
+ case EAP_SIM_SUCCESS:
+ wpa_printf(MSG_INFO, "EAP-%s: Successful authentication "
+ "notification", type);
+ break;
+ default:
+ if (notification >= 32768) {
+ wpa_printf(MSG_INFO, "EAP-%s: Unrecognized "
+ "non-failure notification %d",
+ type, notification);
+ } else {
+ wpa_printf(MSG_WARNING, "EAP-%s: Unrecognized "
+ "failure notification %d",
+ type, notification);
+ }
+ }
+}
+
+
+#ifdef TEST_MAIN_EAP_SIM_COMMON
+static int test_eap_sim_prf(void)
+{
+ /* http://csrc.nist.gov/encryption/dss/Examples-1024bit.pdf */
+ u8 xkey[] = {
+ 0xbd, 0x02, 0x9b, 0xbe, 0x7f, 0x51, 0x96, 0x0b,
+ 0xcf, 0x9e, 0xdb, 0x2b, 0x61, 0xf0, 0x6f, 0x0f,
+ 0xeb, 0x5a, 0x38, 0xb6
+ };
+ u8 w[] = {
+ 0x20, 0x70, 0xb3, 0x22, 0x3d, 0xba, 0x37, 0x2f,
+ 0xde, 0x1c, 0x0f, 0xfc, 0x7b, 0x2e, 0x3b, 0x49,
+ 0x8b, 0x26, 0x06, 0x14, 0x3c, 0x6c, 0x18, 0xba,
+ 0xcb, 0x0f, 0x6c, 0x55, 0xba, 0xbb, 0x13, 0x78,
+ 0x8e, 0x20, 0xd7, 0x37, 0xa3, 0x27, 0x51, 0x16
+ };
+ u8 buf[40];
+
+ printf("Testing EAP-SIM PRF (FIPS 186-2 + change notice 1)\n");
+ eap_sim_prf(xkey, buf, sizeof(buf));
+ if (memcmp(w, buf, sizeof(w) != 0)) {
+ printf("eap_sim_prf failed\n");
+ return 1;
+ }
+
+ return 0;
+}
+
+
+int main(int argc, char *argv[])
+{
+ int errors = 0;
+
+ errors += test_eap_sim_prf();
+
+ return errors;
+}
+#endif /* TEST_MAIN_EAP_SIM_COMMON */
generated by cgit v1.2.3 (git 2.25.1) at 2025-08-07 23:27:12 +0000