2 * EAP-TLS/PEAP/TTLS/FAST server common functions
3 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
12 #include "crypto/sha1.h"
13 #include "crypto/tls.h"
15 #include "eap_tls_common.h"
18 static void eap_server_tls_free_in_buf(struct eap_ssl_data *data);
21 struct wpabuf * eap_tls_msg_alloc(EapType type, size_t payload_len,
22 u8 code, u8 identifier)
24 if (type == EAP_UNAUTH_TLS_TYPE)
25 return eap_msg_alloc(EAP_VENDOR_UNAUTH_TLS,
26 EAP_VENDOR_TYPE_UNAUTH_TLS, payload_len,
28 return eap_msg_alloc(EAP_VENDOR_IETF, type, payload_len, code,
33 int eap_server_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
36 if (sm->ssl_ctx == NULL) {
37 wpa_printf(MSG_ERROR, "TLS context not initialized - cannot use TLS-based EAP method");
42 data->phase2 = sm->init_phase2;
44 data->conn = tls_connection_init(sm->ssl_ctx);
45 if (data->conn == NULL) {
46 wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
51 if (tls_connection_set_verify(sm->ssl_ctx, data->conn, verify_peer)) {
52 wpa_printf(MSG_INFO, "SSL: Failed to configure verification "
53 "of TLS peer certificate");
54 tls_connection_deinit(sm->ssl_ctx, data->conn);
59 data->tls_out_limit = sm->fragment_size > 0 ? sm->fragment_size : 1398;
61 /* Limit the fragment size in the inner TLS authentication
62 * since the outer authentication with EAP-PEAP does not yet
63 * support fragmentation */
64 if (data->tls_out_limit > 100)
65 data->tls_out_limit -= 100;
71 void eap_server_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
73 tls_connection_deinit(sm->ssl_ctx, data->conn);
74 eap_server_tls_free_in_buf(data);
75 wpabuf_free(data->tls_out);
80 u8 * eap_server_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
81 char *label, size_t len)
90 if (tls_connection_prf(sm->ssl_ctx, data->conn, label, 0, out, len) ==
94 if (tls_connection_get_keys(sm->ssl_ctx, data->conn, &keys))
97 if (keys.client_random == NULL || keys.server_random == NULL ||
98 keys.master_key == NULL)
101 rnd = os_malloc(keys.client_random_len + keys.server_random_len);
104 os_memcpy(rnd, keys.client_random, keys.client_random_len);
105 os_memcpy(rnd + keys.client_random_len, keys.server_random,
106 keys.server_random_len);
108 if (tls_prf_sha1_md5(keys.master_key, keys.master_key_len,
109 label, rnd, keys.client_random_len +
110 keys.server_random_len, out, len))
123 struct wpabuf * eap_server_tls_build_msg(struct eap_ssl_data *data,
124 int eap_type, int version, u8 id)
128 size_t send_len, plen;
130 wpa_printf(MSG_DEBUG, "SSL: Generating Request");
131 if (data->tls_out == NULL) {
132 wpa_printf(MSG_ERROR, "SSL: tls_out NULL in %s", __func__);
137 send_len = wpabuf_len(data->tls_out) - data->tls_out_pos;
138 if (1 + send_len > data->tls_out_limit) {
139 send_len = data->tls_out_limit - 1;
140 flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
141 if (data->tls_out_pos == 0) {
142 flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
148 if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)
151 req = eap_tls_msg_alloc(eap_type, plen, EAP_CODE_REQUEST, id);
155 wpabuf_put_u8(req, flags); /* Flags */
156 if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)
157 wpabuf_put_be32(req, wpabuf_len(data->tls_out));
159 wpabuf_put_data(req, wpabuf_head_u8(data->tls_out) + data->tls_out_pos,
161 data->tls_out_pos += send_len;
163 if (data->tls_out_pos == wpabuf_len(data->tls_out)) {
164 wpa_printf(MSG_DEBUG, "SSL: Sending out %lu bytes "
165 "(message sent completely)",
166 (unsigned long) send_len);
167 wpabuf_free(data->tls_out);
168 data->tls_out = NULL;
169 data->tls_out_pos = 0;
172 wpa_printf(MSG_DEBUG, "SSL: Sending out %lu bytes "
173 "(%lu more to send)", (unsigned long) send_len,
174 (unsigned long) wpabuf_len(data->tls_out) -
176 data->state = WAIT_FRAG_ACK;
183 struct wpabuf * eap_server_tls_build_ack(u8 id, int eap_type, int version)
187 req = eap_tls_msg_alloc(eap_type, 1, EAP_CODE_REQUEST, id);
190 wpa_printf(MSG_DEBUG, "SSL: Building ACK");
191 wpabuf_put_u8(req, version); /* Flags */
196 static int eap_server_tls_process_cont(struct eap_ssl_data *data,
197 const u8 *buf, size_t len)
199 /* Process continuation of a pending message */
200 if (len > wpabuf_tailroom(data->tls_in)) {
201 wpa_printf(MSG_DEBUG, "SSL: Fragment overflow");
205 wpabuf_put_data(data->tls_in, buf, len);
206 wpa_printf(MSG_DEBUG, "SSL: Received %lu bytes, waiting for %lu "
207 "bytes more", (unsigned long) len,
208 (unsigned long) wpabuf_tailroom(data->tls_in));
214 static int eap_server_tls_process_fragment(struct eap_ssl_data *data,
215 u8 flags, u32 message_length,
216 const u8 *buf, size_t len)
218 /* Process a fragment that is not the last one of the message */
219 if (data->tls_in == NULL && !(flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)) {
220 wpa_printf(MSG_DEBUG, "SSL: No Message Length field in a "
221 "fragmented packet");
225 if (data->tls_in == NULL) {
226 /* First fragment of the message */
228 /* Limit length to avoid rogue peers from causing large
229 * memory allocations. */
230 if (message_length > 65536) {
231 wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size"
236 if (len > message_length) {
237 wpa_printf(MSG_INFO, "SSL: Too much data (%d bytes) in "
238 "first fragment of frame (TLS Message "
240 (int) len, (int) message_length);
244 data->tls_in = wpabuf_alloc(message_length);
245 if (data->tls_in == NULL) {
246 wpa_printf(MSG_DEBUG, "SSL: No memory for message");
249 wpabuf_put_data(data->tls_in, buf, len);
250 wpa_printf(MSG_DEBUG, "SSL: Received %lu bytes in first "
251 "fragment, waiting for %lu bytes more",
253 (unsigned long) wpabuf_tailroom(data->tls_in));
260 int eap_server_tls_phase1(struct eap_sm *sm, struct eap_ssl_data *data)
263 /* This should not happen.. */
264 wpa_printf(MSG_INFO, "SSL: pending tls_out data when "
265 "processing new message");
266 wpabuf_free(data->tls_out);
267 WPA_ASSERT(data->tls_out == NULL);
270 data->tls_out = tls_connection_server_handshake(sm->ssl_ctx,
273 if (data->tls_out == NULL) {
274 wpa_printf(MSG_INFO, "SSL: TLS processing failed");
277 if (tls_connection_get_failed(sm->ssl_ctx, data->conn)) {
278 /* TLS processing has failed - return error */
279 wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to "
288 static int eap_server_tls_reassemble(struct eap_ssl_data *data, u8 flags,
289 const u8 **pos, size_t *left)
291 unsigned int tls_msg_len = 0;
292 const u8 *end = *pos + *left;
294 if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
296 wpa_printf(MSG_INFO, "SSL: Short frame with TLS "
300 tls_msg_len = WPA_GET_BE32(*pos);
301 wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d",
306 if (*left > tls_msg_len) {
307 wpa_printf(MSG_INFO, "SSL: TLS Message Length (%d "
308 "bytes) smaller than this fragment (%d "
309 "bytes)", (int) tls_msg_len, (int) *left);
314 wpa_printf(MSG_DEBUG, "SSL: Received packet: Flags 0x%x "
315 "Message Length %u", flags, tls_msg_len);
317 if (data->state == WAIT_FRAG_ACK) {
319 wpa_printf(MSG_DEBUG, "SSL: Unexpected payload in "
320 "WAIT_FRAG_ACK state");
323 wpa_printf(MSG_DEBUG, "SSL: Fragment acknowledged");
328 eap_server_tls_process_cont(data, *pos, end - *pos) < 0)
331 if (flags & EAP_TLS_FLAGS_MORE_FRAGMENTS) {
332 if (eap_server_tls_process_fragment(data, flags, tls_msg_len,
333 *pos, end - *pos) < 0)
336 data->state = FRAG_ACK;
340 if (data->state == FRAG_ACK) {
341 wpa_printf(MSG_DEBUG, "SSL: All fragments received");
345 if (data->tls_in == NULL) {
346 /* Wrap unfragmented messages as wpabuf without extra copy */
347 wpabuf_set(&data->tmpbuf, *pos, end - *pos);
348 data->tls_in = &data->tmpbuf;
355 static void eap_server_tls_free_in_buf(struct eap_ssl_data *data)
357 if (data->tls_in != &data->tmpbuf)
358 wpabuf_free(data->tls_in);
363 struct wpabuf * eap_server_tls_encrypt(struct eap_sm *sm,
364 struct eap_ssl_data *data,
365 const struct wpabuf *plain)
369 buf = tls_connection_encrypt(sm->ssl_ctx, data->conn,
372 wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 data");
380 int eap_server_tls_process(struct eap_sm *sm, struct eap_ssl_data *data,
381 struct wpabuf *respData, void *priv, int eap_type,
382 int (*proc_version)(struct eap_sm *sm, void *priv,
384 void (*proc_msg)(struct eap_sm *sm, void *priv,
385 const struct wpabuf *respData))
392 if (eap_type == EAP_UNAUTH_TLS_TYPE)
393 pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
394 EAP_VENDOR_TYPE_UNAUTH_TLS, respData,
397 pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, respData,
399 if (pos == NULL || left < 1)
400 return 0; /* Should not happen - frame already validated */
403 wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - Flags 0x%02x",
404 (unsigned long) wpabuf_len(respData), flags);
407 proc_version(sm, priv, flags & EAP_TLS_VERSION_MASK) < 0)
410 ret = eap_server_tls_reassemble(data, flags, &pos, &left);
418 proc_msg(sm, priv, respData);
420 if (tls_connection_get_write_alerts(sm->ssl_ctx, data->conn) > 1) {
421 wpa_printf(MSG_INFO, "SSL: Locally detected fatal error in "
427 eap_server_tls_free_in_buf(data);