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 else if (type == EAP_WFA_UNAUTH_TLS_TYPE)
29 return eap_msg_alloc(EAP_VENDOR_WFA_NEW,
30 EAP_VENDOR_WFA_UNAUTH_TLS, payload_len,
32 return eap_msg_alloc(EAP_VENDOR_IETF, type, payload_len, code,
37 #ifdef CONFIG_TLS_INTERNAL
38 static void eap_server_tls_log_cb(void *ctx, const char *msg)
40 struct eap_sm *sm = ctx;
41 eap_log_msg(sm, "TLS: %s", msg);
43 #endif /* CONFIG_TLS_INTERNAL */
46 int eap_server_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
47 int verify_peer, int eap_type)
50 unsigned int flags = sm->tls_flags;
52 if (sm->ssl_ctx == NULL) {
53 wpa_printf(MSG_ERROR, "TLS context not initialized - cannot use TLS-based EAP method");
58 data->phase2 = sm->init_phase2;
60 data->conn = tls_connection_init(sm->ssl_ctx);
61 if (data->conn == NULL) {
62 wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
67 #ifdef CONFIG_TLS_INTERNAL
68 tls_connection_set_log_cb(data->conn, eap_server_tls_log_cb, sm);
69 #ifdef CONFIG_TESTING_OPTIONS
70 tls_connection_set_test_flags(data->conn, sm->tls_test_flags);
71 #endif /* CONFIG_TESTING_OPTIONS */
72 #endif /* CONFIG_TLS_INTERNAL */
74 if (eap_type != EAP_TYPE_FAST)
75 flags |= TLS_CONN_DISABLE_SESSION_TICKET;
76 os_memcpy(session_ctx, "hostapd", 7);
77 session_ctx[7] = (u8) eap_type;
78 if (tls_connection_set_verify(sm->ssl_ctx, data->conn, verify_peer,
80 sizeof(session_ctx))) {
81 wpa_printf(MSG_INFO, "SSL: Failed to configure verification "
82 "of TLS peer certificate");
83 tls_connection_deinit(sm->ssl_ctx, data->conn);
88 data->tls_out_limit = sm->fragment_size > 0 ? sm->fragment_size : 1398;
90 /* Limit the fragment size in the inner TLS authentication
91 * since the outer authentication with EAP-PEAP does not yet
92 * support fragmentation */
93 if (data->tls_out_limit > 100)
94 data->tls_out_limit -= 100;
100 void eap_server_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
102 tls_connection_deinit(sm->ssl_ctx, data->conn);
103 eap_server_tls_free_in_buf(data);
104 wpabuf_free(data->tls_out);
105 data->tls_out = NULL;
109 u8 * eap_server_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
110 const char *label, size_t len)
114 out = os_malloc(len);
118 if (tls_connection_export_key(sm->ssl_ctx, data->conn, label, out,
129 * eap_server_tls_derive_session_id - Derive a Session-Id based on TLS data
130 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
131 * @data: Data for TLS processing
132 * @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
133 * @len: Pointer to length of the session ID generated
134 * Returns: Pointer to allocated Session-Id on success or %NULL on failure
136 * This function derive the Session-Id based on the TLS session data
137 * (client/server random and method type).
139 * The caller is responsible for freeing the returned buffer.
141 u8 * eap_server_tls_derive_session_id(struct eap_sm *sm,
142 struct eap_ssl_data *data, u8 eap_type,
145 struct tls_random keys;
148 if (eap_type == EAP_TYPE_TLS && data->tls_v13) {
150 return eap_server_tls_derive_key(sm, data,
151 "EXPORTER_EAP_TLS_Session-Id",
155 if (tls_connection_get_random(sm->ssl_ctx, data->conn, &keys))
158 if (keys.client_random == NULL || keys.server_random == NULL)
161 *len = 1 + keys.client_random_len + keys.server_random_len;
162 out = os_malloc(*len);
166 /* Session-Id = EAP type || client.random || server.random */
168 os_memcpy(out + 1, keys.client_random, keys.client_random_len);
169 os_memcpy(out + 1 + keys.client_random_len, keys.server_random,
170 keys.server_random_len);
176 struct wpabuf * eap_server_tls_build_msg(struct eap_ssl_data *data,
177 int eap_type, int version, u8 id)
181 size_t send_len, plen;
183 wpa_printf(MSG_DEBUG, "SSL: Generating Request");
184 if (data->tls_out == NULL) {
185 wpa_printf(MSG_ERROR, "SSL: tls_out NULL in %s", __func__);
190 send_len = wpabuf_len(data->tls_out) - data->tls_out_pos;
191 if (1 + send_len > data->tls_out_limit) {
192 send_len = data->tls_out_limit - 1;
193 flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
194 if (data->tls_out_pos == 0) {
195 flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
201 if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)
204 req = eap_tls_msg_alloc(eap_type, plen, EAP_CODE_REQUEST, id);
208 wpabuf_put_u8(req, flags); /* Flags */
209 if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)
210 wpabuf_put_be32(req, wpabuf_len(data->tls_out));
212 wpabuf_put_data(req, wpabuf_head_u8(data->tls_out) + data->tls_out_pos,
214 data->tls_out_pos += send_len;
216 if (data->tls_out_pos == wpabuf_len(data->tls_out)) {
217 wpa_printf(MSG_DEBUG, "SSL: Sending out %lu bytes "
218 "(message sent completely)",
219 (unsigned long) send_len);
220 wpabuf_free(data->tls_out);
221 data->tls_out = NULL;
222 data->tls_out_pos = 0;
225 wpa_printf(MSG_DEBUG, "SSL: Sending out %lu bytes "
226 "(%lu more to send)", (unsigned long) send_len,
227 (unsigned long) wpabuf_len(data->tls_out) -
229 data->state = WAIT_FRAG_ACK;
236 struct wpabuf * eap_server_tls_build_ack(u8 id, int eap_type, int version)
240 req = eap_tls_msg_alloc(eap_type, 1, EAP_CODE_REQUEST, id);
243 wpa_printf(MSG_DEBUG, "SSL: Building ACK");
244 wpabuf_put_u8(req, version); /* Flags */
249 static int eap_server_tls_process_cont(struct eap_ssl_data *data,
250 const u8 *buf, size_t len)
252 /* Process continuation of a pending message */
253 if (len > wpabuf_tailroom(data->tls_in)) {
254 wpa_printf(MSG_DEBUG, "SSL: Fragment overflow");
258 wpabuf_put_data(data->tls_in, buf, len);
259 wpa_printf(MSG_DEBUG, "SSL: Received %lu bytes, waiting for %lu "
260 "bytes more", (unsigned long) len,
261 (unsigned long) wpabuf_tailroom(data->tls_in));
267 static int eap_server_tls_process_fragment(struct eap_ssl_data *data,
268 u8 flags, u32 message_length,
269 const u8 *buf, size_t len)
271 /* Process a fragment that is not the last one of the message */
272 if (data->tls_in == NULL && !(flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)) {
273 wpa_printf(MSG_DEBUG, "SSL: No Message Length field in a "
274 "fragmented packet");
278 if (data->tls_in == NULL) {
279 /* First fragment of the message */
281 /* Limit length to avoid rogue peers from causing large
282 * memory allocations. */
283 if (message_length > 65536) {
284 wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size"
289 if (len > message_length) {
290 wpa_printf(MSG_INFO, "SSL: Too much data (%d bytes) in "
291 "first fragment of frame (TLS Message "
293 (int) len, (int) message_length);
297 data->tls_in = wpabuf_alloc(message_length);
298 if (data->tls_in == NULL) {
299 wpa_printf(MSG_DEBUG, "SSL: No memory for message");
302 wpabuf_put_data(data->tls_in, buf, len);
303 wpa_printf(MSG_DEBUG, "SSL: Received %lu bytes in first "
304 "fragment, waiting for %lu bytes more",
306 (unsigned long) wpabuf_tailroom(data->tls_in));
313 int eap_server_tls_phase1(struct eap_sm *sm, struct eap_ssl_data *data)
318 /* This should not happen.. */
319 wpa_printf(MSG_INFO, "SSL: pending tls_out data when "
320 "processing new message");
321 wpabuf_free(data->tls_out);
322 WPA_ASSERT(data->tls_out == NULL);
325 data->tls_out = tls_connection_server_handshake(sm->ssl_ctx,
328 if (data->tls_out == NULL) {
329 wpa_printf(MSG_INFO, "SSL: TLS processing failed");
332 if (tls_connection_get_failed(sm->ssl_ctx, data->conn)) {
333 /* TLS processing has failed - return error */
334 wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to "
339 if (tls_get_version(sm->ssl_ctx, data->conn, buf, sizeof(buf)) == 0) {
340 wpa_printf(MSG_DEBUG, "SSL: Using TLS version %s", buf);
341 data->tls_v13 = os_strcmp(buf, "TLSv1.3") == 0;
344 if (!sm->serial_num &&
345 tls_connection_established(sm->ssl_ctx, data->conn))
346 sm->serial_num = tls_connection_peer_serial_num(sm->ssl_ctx,
353 static int eap_server_tls_reassemble(struct eap_ssl_data *data, u8 flags,
354 const u8 **pos, size_t *left)
356 unsigned int tls_msg_len = 0;
357 const u8 *end = *pos + *left;
359 if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
361 wpa_printf(MSG_INFO, "SSL: Short frame with TLS "
365 tls_msg_len = WPA_GET_BE32(*pos);
366 wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d",
371 if (*left > tls_msg_len) {
372 wpa_printf(MSG_INFO, "SSL: TLS Message Length (%d "
373 "bytes) smaller than this fragment (%d "
374 "bytes)", (int) tls_msg_len, (int) *left);
379 wpa_printf(MSG_DEBUG, "SSL: Received packet: Flags 0x%x "
380 "Message Length %u", flags, tls_msg_len);
382 if (data->state == WAIT_FRAG_ACK) {
384 wpa_printf(MSG_DEBUG, "SSL: Unexpected payload in "
385 "WAIT_FRAG_ACK state");
388 wpa_printf(MSG_DEBUG, "SSL: Fragment acknowledged");
393 eap_server_tls_process_cont(data, *pos, end - *pos) < 0)
396 if (flags & EAP_TLS_FLAGS_MORE_FRAGMENTS) {
397 if (eap_server_tls_process_fragment(data, flags, tls_msg_len,
398 *pos, end - *pos) < 0)
401 data->state = FRAG_ACK;
405 if (data->state == FRAG_ACK) {
406 wpa_printf(MSG_DEBUG, "SSL: All fragments received");
410 if (data->tls_in == NULL) {
411 /* Wrap unfragmented messages as wpabuf without extra copy */
412 wpabuf_set(&data->tmpbuf, *pos, end - *pos);
413 data->tls_in = &data->tmpbuf;
420 static void eap_server_tls_free_in_buf(struct eap_ssl_data *data)
422 if (data->tls_in != &data->tmpbuf)
423 wpabuf_free(data->tls_in);
428 struct wpabuf * eap_server_tls_encrypt(struct eap_sm *sm,
429 struct eap_ssl_data *data,
430 const struct wpabuf *plain)
434 buf = tls_connection_encrypt(sm->ssl_ctx, data->conn,
437 wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 data");
445 int eap_server_tls_process(struct eap_sm *sm, struct eap_ssl_data *data,
446 struct wpabuf *respData, void *priv, int eap_type,
447 int (*proc_version)(struct eap_sm *sm, void *priv,
449 void (*proc_msg)(struct eap_sm *sm, void *priv,
450 const struct wpabuf *respData))
457 if (eap_type == EAP_UNAUTH_TLS_TYPE)
458 pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
459 EAP_VENDOR_TYPE_UNAUTH_TLS, respData,
461 else if (eap_type == EAP_WFA_UNAUTH_TLS_TYPE)
462 pos = eap_hdr_validate(EAP_VENDOR_WFA_NEW,
463 EAP_VENDOR_WFA_UNAUTH_TLS, respData,
466 pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, respData,
468 if (pos == NULL || left < 1)
469 return 0; /* Should not happen - frame already validated */
472 wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - Flags 0x%02x",
473 (unsigned long) wpabuf_len(respData), flags);
476 proc_version(sm, priv, flags & EAP_TLS_VERSION_MASK) < 0)
479 ret = eap_server_tls_reassemble(data, flags, &pos, &left);
487 proc_msg(sm, priv, respData);
489 if (tls_connection_get_write_alerts(sm->ssl_ctx, data->conn) > 1) {
490 wpa_printf(MSG_INFO, "SSL: Locally detected fatal error in "
496 eap_server_tls_free_in_buf(data);