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-rw-r--r--contrib/hostapd/eap_tls_common.c272
1 files changed, 272 insertions, 0 deletions
diff --git a/contrib/hostapd/eap_tls_common.c b/contrib/hostapd/eap_tls_common.c
new file mode 100644
index 0000000000000..ca10eca7e46ed
--- /dev/null
+++ b/contrib/hostapd/eap_tls_common.c
@@ -0,0 +1,272 @@
+/*
+ * hostapd / EAP-TLS/PEAP/TTLS common functions
+ * 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 <netinet/in.h>
+
+#include "hostapd.h"
+#include "common.h"
+#include "eap_i.h"
+#include "eap_tls_common.h"
+#include "sha1.h"
+#include "tls.h"
+
+
+int eap_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
+ int verify_peer)
+{
+ data->eap = sm;
+ data->phase2 = sm->init_phase2;
+
+ data->conn = tls_connection_init(sm->ssl_ctx);
+ if (data->conn == NULL) {
+ wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
+ "connection");
+ return -1;
+ }
+
+ if (tls_connection_set_verify(sm->ssl_ctx, data->conn, verify_peer,
+ NULL)) {
+ wpa_printf(MSG_INFO, "SSL: Failed to configure verification "
+ "of TLS peer certificate");
+ tls_connection_deinit(sm->ssl_ctx, data->conn);
+ data->conn = NULL;
+ return -1;
+ }
+
+ /* TODO: make this configurable */
+ data->tls_out_limit = 1398;
+ if (data->phase2) {
+ /* Limit the fragment size in the inner TLS authentication
+ * since the outer authentication with EAP-PEAP does not yet
+ * support fragmentation */
+ if (data->tls_out_limit > 100)
+ data->tls_out_limit -= 100;
+ }
+ return 0;
+}
+
+
+void eap_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
+{
+ tls_connection_deinit(sm->ssl_ctx, data->conn);
+ free(data->tls_in);
+ free(data->tls_out);
+}
+
+
+u8 * eap_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
+ char *label, size_t len)
+{
+ struct tls_keys keys;
+ u8 *random;
+ u8 *out;
+
+ if (tls_connection_get_keys(sm->ssl_ctx, data->conn, &keys))
+ return NULL;
+ out = malloc(len);
+ random = malloc(keys.client_random_len + keys.server_random_len);
+ if (out == NULL || random == NULL) {
+ free(out);
+ free(random);
+ return NULL;
+ }
+ memcpy(random, keys.client_random, keys.client_random_len);
+ memcpy(random + keys.client_random_len, keys.server_random,
+ keys.server_random_len);
+
+ if (tls_prf(keys.master_key, keys.master_key_len,
+ label, random, keys.client_random_len +
+ keys.server_random_len, out, len)) {
+ free(random);
+ free(out);
+ return NULL;
+ }
+ free(random);
+ return out;
+}
+
+
+int eap_tls_data_reassemble(struct eap_sm *sm, struct eap_ssl_data *data,
+ u8 **in_data, size_t *in_len)
+{
+ u8 *buf;
+
+ if (data->tls_in_left > *in_len || data->tls_in) {
+ buf = realloc(data->tls_in, data->tls_in_len + *in_len);
+ if (buf == NULL) {
+ free(data->tls_in);
+ data->tls_in = NULL;
+ data->tls_in_len = 0;
+ wpa_printf(MSG_INFO, "SSL: Could not allocate memory "
+ "for TLS data");
+ return -1;
+ }
+ memcpy(buf + data->tls_in_len, *in_data, *in_len);
+ data->tls_in = buf;
+ data->tls_in_len += *in_len;
+ if (*in_len > data->tls_in_left) {
+ wpa_printf(MSG_INFO, "SSL: more data than TLS message "
+ "length indicated");
+ data->tls_in_left = 0;
+ return -1;
+ }
+ data->tls_in_left -= *in_len;
+ if (data->tls_in_left > 0) {
+ wpa_printf(MSG_DEBUG, "SSL: Need %lu bytes more input "
+ "data", (unsigned long) data->tls_in_left);
+ return 1;
+ }
+
+ *in_data = data->tls_in;
+ *in_len = data->tls_in_len;
+ } else
+ data->tls_in_left = 0;
+
+ return 0;
+}
+
+
+int eap_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
+ u8 *in_data, size_t in_len)
+{
+ WPA_ASSERT(data->tls_out_len == 0 || in_len == 0);
+
+ if (data->tls_out_len == 0) {
+ /* No more data to send out - expect to receive more data from
+ * the peer. */
+ int res = eap_tls_data_reassemble(sm, data, &in_data, &in_len);
+ if (res < 0 || res == 1) {
+ wpa_printf(MSG_DEBUG, "SSL: data reassembly failed");
+ return res;
+ }
+ /* Full TLS message reassembled - continue handshake processing
+ */
+ if (data->tls_out) {
+ /* This should not happen.. */
+ wpa_printf(MSG_INFO, "SSL: eap_tls_process_helper - "
+ "pending tls_out data even though "
+ "tls_out_len = 0");
+ free(data->tls_out);
+ WPA_ASSERT(data->tls_out == NULL);
+ }
+ data->tls_out = tls_connection_server_handshake(
+ sm->ssl_ctx, data->conn, in_data, in_len,
+ &data->tls_out_len);
+
+ /* Clear reassembled input data (if the buffer was needed). */
+ data->tls_in_left = data->tls_in_total = data->tls_in_len = 0;
+ free(data->tls_in);
+ data->tls_in = NULL;
+ }
+
+ if (data->tls_out == NULL) {
+ wpa_printf(MSG_DEBUG, "SSL: failed to generate output data");
+ data->tls_out_len = 0;
+ return -1;
+ }
+ if (data->tls_out_len == 0) {
+ /* TLS negotiation should now be complete since all other cases
+ * needing more that should have been catched above based on
+ * the TLS Message Length field. */
+ wpa_printf(MSG_DEBUG, "SSL: No data to be sent out");
+ free(data->tls_out);
+ data->tls_out = NULL;
+ return 1;
+ }
+
+ wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total "
+ "%lu bytes)",
+ (unsigned long) data->tls_out_len - data->tls_out_pos,
+ (unsigned long) data->tls_out_len);
+
+ return 0;
+}
+
+
+int eap_tls_buildReq_helper(struct eap_sm *sm, struct eap_ssl_data *data,
+ int eap_type, int peap_version, u8 id,
+ u8 **out_data, size_t *out_len)
+{
+ size_t len;
+ u8 *pos, *flags;
+ struct eap_hdr *req;
+
+ *out_len = 0;
+
+ req = malloc(sizeof(struct eap_hdr) + 2 + 4 + data->tls_out_limit);
+ if (req == NULL) {
+ *out_data = NULL;
+ return -1;
+ }
+ req->code = EAP_CODE_REQUEST;
+ req->identifier = id;
+ pos = (u8 *) (req + 1);
+ *pos++ = eap_type;
+ flags = pos++;
+ *flags = peap_version;
+ if (data->tls_out_pos == 0 &&
+ data->tls_out_len > data->tls_out_limit) {
+ *flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
+ *pos++ = (data->tls_out_len >> 24) & 0xff;
+ *pos++ = (data->tls_out_len >> 16) & 0xff;
+ *pos++ = (data->tls_out_len >> 8) & 0xff;
+ *pos++ = data->tls_out_len & 0xff;
+ }
+
+ len = data->tls_out_len - data->tls_out_pos;
+ if (len > data->tls_out_limit) {
+ *flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
+ len = data->tls_out_limit;
+ wpa_printf(MSG_DEBUG, "SSL: sending %lu bytes, more fragments "
+ "will follow", (unsigned long) len);
+ }
+ memcpy(pos, &data->tls_out[data->tls_out_pos], len);
+ data->tls_out_pos += len;
+ *out_len = (pos - (u8 *) req) + len;
+ req->length = htons(*out_len);
+ *out_data = (u8 *) req;
+
+ if (!(*flags & EAP_TLS_FLAGS_MORE_FRAGMENTS)) {
+ data->tls_out_len = 0;
+ data->tls_out_pos = 0;
+ free(data->tls_out);
+ data->tls_out = NULL;
+ }
+
+ return 0;
+}
+
+
+u8 * eap_tls_build_ack(size_t *reqDataLen, u8 id, int eap_type,
+ int peap_version)
+{
+ struct eap_hdr *req;
+ u8 *pos;
+
+ *reqDataLen = sizeof(struct eap_hdr) + 2;
+ req = malloc(*reqDataLen);
+ if (req == NULL)
+ return NULL;
+ wpa_printf(MSG_DEBUG, "SSL: Building ACK");
+ req->code = EAP_CODE_REQUEST;
+ req->identifier = id;
+ req->length = htons(*reqDataLen);
+ pos = (u8 *) (req + 1);
+ *pos++ = eap_type; /* Type */
+ *pos = peap_version; /* Flags */
+ return (u8 *) req;
+}
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