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Commit | Line | Data |
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846e33c7 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
3813046d | 3 | * |
846e33c7 RS |
4 | * Licensed under the OpenSSL license (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
3813046d | 8 | */ |
846e33c7 | 9 | |
ea262260 BM |
10 | /* ==================================================================== |
11 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. | |
0f113f3e | 12 | * ECC cipher suite support in OpenSSL originally developed by |
ea262260 BM |
13 | * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. |
14 | */ | |
d02b48c6 | 15 | |
48948d53 | 16 | #include <limits.h> |
f2d9a32c | 17 | #include <string.h> |
d02b48c6 | 18 | #include <stdio.h> |
8ba708e5 | 19 | #include "../ssl_locl.h" |
61ae935a | 20 | #include "statem_locl.h" |
ec577822 | 21 | #include <openssl/buffer.h> |
ec577822 BM |
22 | #include <openssl/objects.h> |
23 | #include <openssl/evp.h> | |
24 | #include <openssl/x509.h> | |
d02b48c6 | 25 | |
0f113f3e MC |
26 | /* |
27 | * send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or | |
28 | * SSL3_RT_CHANGE_CIPHER_SPEC) | |
29 | */ | |
e7ecc7d4 | 30 | int ssl3_do_write(SSL *s, int type) |
0f113f3e MC |
31 | { |
32 | int ret; | |
7ee8627f | 33 | size_t written = 0; |
0f113f3e MC |
34 | |
35 | ret = ssl3_write_bytes(s, type, &s->init_buf->data[s->init_off], | |
7ee8627f | 36 | s->init_num, &written); |
0f113f3e MC |
37 | if (ret < 0) |
38 | return (-1); | |
39 | if (type == SSL3_RT_HANDSHAKE) | |
40 | /* | |
41 | * should not be done for 'Hello Request's, but in that case we'll | |
42 | * ignore the result anyway | |
43 | */ | |
d166ed8c DSH |
44 | if (!ssl3_finish_mac(s, |
45 | (unsigned char *)&s->init_buf->data[s->init_off], | |
7ee8627f | 46 | written)) |
d166ed8c | 47 | return -1; |
0f113f3e | 48 | |
7ee8627f | 49 | if (written == s->init_num) { |
0f113f3e MC |
50 | if (s->msg_callback) |
51 | s->msg_callback(1, s->version, type, s->init_buf->data, | |
52 | (size_t)(s->init_off + s->init_num), s, | |
53 | s->msg_callback_arg); | |
54 | return (1); | |
55 | } | |
7ee8627f MC |
56 | s->init_off += written; |
57 | s->init_num -= written; | |
0f113f3e MC |
58 | return (0); |
59 | } | |
e7ecc7d4 | 60 | |
4a01c59f | 61 | int tls_close_construct_packet(SSL *s, WPACKET *pkt, int htype) |
2c7b4dbc MC |
62 | { |
63 | size_t msglen; | |
64 | ||
4a01c59f | 65 | if ((htype != SSL3_MT_CHANGE_CIPHER_SPEC && !WPACKET_close(pkt)) |
f1ec23c0 | 66 | || !WPACKET_get_length(pkt, &msglen) |
7cea05dc | 67 | || msglen > INT_MAX) |
2c7b4dbc MC |
68 | return 0; |
69 | s->init_num = (int)msglen; | |
70 | s->init_off = 0; | |
71 | ||
72 | return 1; | |
73 | } | |
74 | ||
229185e6 | 75 | int tls_construct_finished(SSL *s, WPACKET *pkt) |
0f113f3e | 76 | { |
12472b45 | 77 | size_t finish_md_len; |
229185e6 | 78 | const char *sender; |
8b0e934a | 79 | size_t slen; |
229185e6 MC |
80 | |
81 | if (s->server) { | |
82 | sender = s->method->ssl3_enc->server_finished_label; | |
83 | slen = s->method->ssl3_enc->server_finished_label_len; | |
84 | } else { | |
85 | sender = s->method->ssl3_enc->client_finished_label; | |
86 | slen = s->method->ssl3_enc->client_finished_label_len; | |
87 | } | |
0f113f3e | 88 | |
12472b45 MC |
89 | finish_md_len = s->method->ssl3_enc->final_finish_mac(s, |
90 | sender, slen, | |
91 | s->s3->tmp.finish_md); | |
92 | if (finish_md_len == 0) { | |
4f89bfbf MC |
93 | SSLerr(SSL_F_TLS_CONSTRUCT_FINISHED, ERR_R_INTERNAL_ERROR); |
94 | goto err; | |
95 | } | |
96 | ||
12472b45 | 97 | s->s3->tmp.finish_md_len = finish_md_len; |
4f89bfbf | 98 | |
12472b45 | 99 | if (!WPACKET_memcpy(pkt, s->s3->tmp.finish_md, finish_md_len)) { |
4f89bfbf MC |
100 | SSLerr(SSL_F_TLS_CONSTRUCT_FINISHED, ERR_R_INTERNAL_ERROR); |
101 | goto err; | |
102 | } | |
0f113f3e | 103 | |
b9908bf9 MC |
104 | /* |
105 | * Copy the finished so we can use it for renegotiation checks | |
106 | */ | |
23a635c0 | 107 | if (!s->server) { |
12472b45 MC |
108 | OPENSSL_assert(finish_md_len <= EVP_MAX_MD_SIZE); |
109 | memcpy(s->s3->previous_client_finished, s->s3->tmp.finish_md, | |
110 | finish_md_len); | |
111 | s->s3->previous_client_finished_len = finish_md_len; | |
b9908bf9 | 112 | } else { |
12472b45 MC |
113 | OPENSSL_assert(finish_md_len <= EVP_MAX_MD_SIZE); |
114 | memcpy(s->s3->previous_server_finished, s->s3->tmp.finish_md, | |
115 | finish_md_len); | |
116 | s->s3->previous_server_finished_len = finish_md_len; | |
b9908bf9 | 117 | } |
0f113f3e | 118 | |
b9908bf9 | 119 | return 1; |
4f89bfbf | 120 | err: |
4f89bfbf MC |
121 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
122 | return 0; | |
0f113f3e | 123 | } |
d02b48c6 | 124 | |
bf48836c | 125 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
126 | /* |
127 | * ssl3_take_mac calculates the Finished MAC for the handshakes messages seen | |
128 | * to far. | |
129 | */ | |
ee2ffc27 | 130 | static void ssl3_take_mac(SSL *s) |
0f113f3e MC |
131 | { |
132 | const char *sender; | |
8b0e934a | 133 | size_t slen; |
0f113f3e MC |
134 | /* |
135 | * If no new cipher setup return immediately: other functions will set | |
136 | * the appropriate error. | |
137 | */ | |
138 | if (s->s3->tmp.new_cipher == NULL) | |
139 | return; | |
49ae7423 | 140 | if (!s->server) { |
0f113f3e MC |
141 | sender = s->method->ssl3_enc->server_finished_label; |
142 | slen = s->method->ssl3_enc->server_finished_label_len; | |
143 | } else { | |
144 | sender = s->method->ssl3_enc->client_finished_label; | |
145 | slen = s->method->ssl3_enc->client_finished_label_len; | |
146 | } | |
147 | ||
148 | s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s, | |
149 | sender, | |
150 | slen, | |
151 | s->s3->tmp.peer_finish_md); | |
152 | } | |
ee2ffc27 BL |
153 | #endif |
154 | ||
64386324 MC |
155 | /* |
156 | * Comparison function used in a call to qsort (see tls_collect_extensions() | |
157 | * below.) | |
158 | * The two arguments |p1| and |p2| are expected to be pointers to RAW_EXTENSIONs | |
159 | * | |
160 | * Returns: | |
161 | * 1 if the type for p1 is greater than p2 | |
162 | * 0 if the type for p1 and p2 are the same | |
163 | * -1 if the type for p1 is less than p2 | |
164 | */ | |
1ab3836b MC |
165 | static int compare_extensions(const void *p1, const void *p2) |
166 | { | |
167 | const RAW_EXTENSION *e1 = (const RAW_EXTENSION *)p1; | |
168 | const RAW_EXTENSION *e2 = (const RAW_EXTENSION *)p2; | |
b1b4b543 | 169 | |
1ab3836b MC |
170 | if (e1->type < e2->type) |
171 | return -1; | |
172 | else if (e1->type > e2->type) | |
173 | return 1; | |
b1b4b543 MC |
174 | |
175 | return 0; | |
1ab3836b MC |
176 | } |
177 | ||
178 | /* | |
179 | * Gather a list of all the extensions. We don't actually process the content | |
180 | * of the extensions yet, except to check their types. | |
181 | * | |
182 | * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be | |
183 | * more than one extension of the same type in a ClientHello or ServerHello. | |
184 | * This function returns 1 if all extensions are unique and we have parsed their | |
185 | * types, and 0 if the extensions contain duplicates, could not be successfully | |
186 | * parsed, or an internal error occurred. | |
187 | */ | |
de7d61d5 MC |
188 | /* |
189 | * TODO(TLS1.3): Refactor ServerHello extension parsing to use this and then | |
190 | * remove tls1_check_duplicate_extensions() | |
191 | */ | |
b1b4b543 | 192 | int tls_collect_extensions(PACKET *packet, RAW_EXTENSION **res, |
1ab3836b MC |
193 | size_t *numfound, int *ad) |
194 | { | |
195 | PACKET extensions = *packet; | |
196 | size_t num_extensions = 0, i = 0; | |
197 | RAW_EXTENSION *raw_extensions = NULL; | |
198 | ||
199 | /* First pass: count the extensions. */ | |
200 | while (PACKET_remaining(&extensions) > 0) { | |
201 | unsigned int type; | |
202 | PACKET extension; | |
b1b4b543 | 203 | |
1ab3836b MC |
204 | if (!PACKET_get_net_2(&extensions, &type) || |
205 | !PACKET_get_length_prefixed_2(&extensions, &extension)) { | |
206 | *ad = SSL_AD_DECODE_ERROR; | |
b1b4b543 | 207 | goto err; |
1ab3836b MC |
208 | } |
209 | num_extensions++; | |
210 | } | |
211 | ||
212 | if (num_extensions > 0) { | |
b1b4b543 MC |
213 | raw_extensions = OPENSSL_malloc(sizeof(*raw_extensions) |
214 | * num_extensions); | |
1ab3836b MC |
215 | if (raw_extensions == NULL) { |
216 | *ad = SSL_AD_INTERNAL_ERROR; | |
801cb720 | 217 | SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, ERR_R_MALLOC_FAILURE); |
b1b4b543 | 218 | goto err; |
1ab3836b MC |
219 | } |
220 | ||
64386324 | 221 | /* Second pass: collect the extensions. */ |
1ab3836b MC |
222 | for (i = 0; i < num_extensions; i++) { |
223 | if (!PACKET_get_net_2(packet, &raw_extensions[i].type) || | |
224 | !PACKET_get_length_prefixed_2(packet, | |
225 | &raw_extensions[i].data)) { | |
226 | /* This should not happen. */ | |
227 | *ad = SSL_AD_INTERNAL_ERROR; | |
801cb720 | 228 | SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, ERR_R_INTERNAL_ERROR); |
b1b4b543 | 229 | goto err; |
1ab3836b MC |
230 | } |
231 | } | |
232 | ||
233 | if (PACKET_remaining(packet) != 0) { | |
234 | *ad = SSL_AD_DECODE_ERROR; | |
801cb720 | 235 | SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_LENGTH_MISMATCH); |
b1b4b543 | 236 | goto err; |
1ab3836b MC |
237 | } |
238 | /* Sort the extensions and make sure there are no duplicates. */ | |
b1b4b543 | 239 | qsort(raw_extensions, num_extensions, sizeof(*raw_extensions), |
1ab3836b MC |
240 | compare_extensions); |
241 | for (i = 1; i < num_extensions; i++) { | |
242 | if (raw_extensions[i - 1].type == raw_extensions[i].type) { | |
243 | *ad = SSL_AD_DECODE_ERROR; | |
b1b4b543 | 244 | goto err; |
1ab3836b MC |
245 | } |
246 | } | |
247 | } | |
248 | ||
249 | *res = raw_extensions; | |
250 | *numfound = num_extensions; | |
251 | return 1; | |
252 | ||
b1b4b543 | 253 | err: |
1ab3836b MC |
254 | OPENSSL_free(raw_extensions); |
255 | return 0; | |
256 | } | |
257 | ||
258 | ||
259 | ||
be3583fa | 260 | MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt) |
b9908bf9 MC |
261 | { |
262 | int al; | |
348240c6 | 263 | size_t remain; |
4fa52141 | 264 | |
73999b62 | 265 | remain = PACKET_remaining(pkt); |
657da85e MC |
266 | /* |
267 | * 'Change Cipher Spec' is just a single byte, which should already have | |
c69f2adf MC |
268 | * been consumed by ssl_get_message() so there should be no bytes left, |
269 | * unless we're using DTLS1_BAD_VER, which has an extra 2 bytes | |
657da85e | 270 | */ |
c69f2adf | 271 | if (SSL_IS_DTLS(s)) { |
73999b62 | 272 | if ((s->version == DTLS1_BAD_VER |
a230b26e EK |
273 | && remain != DTLS1_CCS_HEADER_LENGTH + 1) |
274 | || (s->version != DTLS1_BAD_VER | |
275 | && remain != DTLS1_CCS_HEADER_LENGTH - 1)) { | |
276 | al = SSL_AD_ILLEGAL_PARAMETER; | |
277 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, | |
278 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
279 | goto f_err; | |
c69f2adf MC |
280 | } |
281 | } else { | |
73999b62 | 282 | if (remain != 0) { |
c69f2adf | 283 | al = SSL_AD_ILLEGAL_PARAMETER; |
b9908bf9 MC |
284 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, |
285 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
c69f2adf MC |
286 | goto f_err; |
287 | } | |
657da85e MC |
288 | } |
289 | ||
290 | /* Check we have a cipher to change to */ | |
291 | if (s->s3->tmp.new_cipher == NULL) { | |
292 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
b9908bf9 | 293 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, SSL_R_CCS_RECEIVED_EARLY); |
657da85e MC |
294 | goto f_err; |
295 | } | |
296 | ||
297 | s->s3->change_cipher_spec = 1; | |
298 | if (!ssl3_do_change_cipher_spec(s)) { | |
299 | al = SSL_AD_INTERNAL_ERROR; | |
b9908bf9 | 300 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); |
657da85e MC |
301 | goto f_err; |
302 | } | |
303 | ||
c69f2adf MC |
304 | if (SSL_IS_DTLS(s)) { |
305 | dtls1_reset_seq_numbers(s, SSL3_CC_READ); | |
306 | ||
307 | if (s->version == DTLS1_BAD_VER) | |
308 | s->d1->handshake_read_seq++; | |
309 | ||
310 | #ifndef OPENSSL_NO_SCTP | |
311 | /* | |
312 | * Remember that a CCS has been received, so that an old key of | |
313 | * SCTP-Auth can be deleted when a CCS is sent. Will be ignored if no | |
314 | * SCTP is used | |
315 | */ | |
316 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL); | |
317 | #endif | |
318 | } | |
319 | ||
b9908bf9 | 320 | return MSG_PROCESS_CONTINUE_READING; |
657da85e MC |
321 | f_err: |
322 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 323 | ossl_statem_set_error(s); |
b9908bf9 | 324 | return MSG_PROCESS_ERROR; |
657da85e MC |
325 | } |
326 | ||
be3583fa | 327 | MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt) |
b9908bf9 | 328 | { |
12472b45 MC |
329 | int al; |
330 | size_t md_len; | |
b9908bf9 | 331 | |
0f113f3e MC |
332 | /* If this occurs, we have missed a message */ |
333 | if (!s->s3->change_cipher_spec) { | |
334 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
b9908bf9 | 335 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_GOT_A_FIN_BEFORE_A_CCS); |
0f113f3e MC |
336 | goto f_err; |
337 | } | |
338 | s->s3->change_cipher_spec = 0; | |
339 | ||
12472b45 | 340 | md_len = s->s3->tmp.peer_finish_md_len; |
0f113f3e | 341 | |
12472b45 | 342 | if (md_len != PACKET_remaining(pkt)) { |
0f113f3e | 343 | al = SSL_AD_DECODE_ERROR; |
b9908bf9 | 344 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_BAD_DIGEST_LENGTH); |
0f113f3e MC |
345 | goto f_err; |
346 | } | |
347 | ||
12472b45 MC |
348 | if (CRYPTO_memcmp(PACKET_data(pkt), s->s3->tmp.peer_finish_md, |
349 | md_len) != 0) { | |
0f113f3e | 350 | al = SSL_AD_DECRYPT_ERROR; |
b9908bf9 | 351 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_DIGEST_CHECK_FAILED); |
0f113f3e MC |
352 | goto f_err; |
353 | } | |
354 | ||
355 | /* | |
356 | * Copy the finished so we can use it for renegotiation checks | |
357 | */ | |
23a635c0 | 358 | if (s->server) { |
12472b45 MC |
359 | OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE); |
360 | memcpy(s->s3->previous_client_finished, s->s3->tmp.peer_finish_md, | |
361 | md_len); | |
362 | s->s3->previous_client_finished_len = md_len; | |
0f113f3e | 363 | } else { |
12472b45 MC |
364 | OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE); |
365 | memcpy(s->s3->previous_server_finished, s->s3->tmp.peer_finish_md, | |
366 | md_len); | |
367 | s->s3->previous_server_finished_len = md_len; | |
0f113f3e MC |
368 | } |
369 | ||
e6575156 | 370 | return MSG_PROCESS_FINISHED_READING; |
0f113f3e MC |
371 | f_err: |
372 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 373 | ossl_statem_set_error(s); |
b9908bf9 | 374 | return MSG_PROCESS_ERROR; |
0f113f3e | 375 | } |
d02b48c6 | 376 | |
7cea05dc | 377 | int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt) |
b9908bf9 | 378 | { |
7cea05dc | 379 | if (!WPACKET_put_bytes_u8(pkt, SSL3_MT_CCS)) { |
3c106325 | 380 | SSLerr(SSL_F_TLS_CONSTRUCT_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); |
85a7a5e6 MC |
381 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
382 | return 0; | |
383 | } | |
b9908bf9 | 384 | |
b9908bf9 MC |
385 | return 1; |
386 | } | |
387 | ||
7cea05dc | 388 | unsigned long ssl3_output_cert_chain(SSL *s, WPACKET *pkt, CERT_PKEY *cpk) |
0f113f3e | 389 | { |
5923ad4b | 390 | if (!WPACKET_start_sub_packet_u24(pkt) |
7cea05dc | 391 | || !ssl_add_cert_chain(s, pkt, cpk) |
5923ad4b | 392 | || !WPACKET_close(pkt)) { |
c49e1912 | 393 | SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN, ERR_R_INTERNAL_ERROR); |
7cea05dc | 394 | return 0; |
77d514c5 | 395 | } |
c49e1912 | 396 | return 1; |
0f113f3e MC |
397 | } |
398 | ||
be3583fa | 399 | WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst) |
8723588e MC |
400 | { |
401 | void (*cb) (const SSL *ssl, int type, int val) = NULL; | |
402 | ||
403 | #ifndef OPENSSL_NO_SCTP | |
404 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) { | |
be3583fa | 405 | WORK_STATE ret; |
8723588e MC |
406 | ret = dtls_wait_for_dry(s); |
407 | if (ret != WORK_FINISHED_CONTINUE) | |
408 | return ret; | |
409 | } | |
410 | #endif | |
411 | ||
412 | /* clean a few things up */ | |
413 | ssl3_cleanup_key_block(s); | |
473483d4 MC |
414 | |
415 | if (!SSL_IS_DTLS(s)) { | |
416 | /* | |
417 | * We don't do this in DTLS because we may still need the init_buf | |
418 | * in case there are any unexpected retransmits | |
419 | */ | |
420 | BUF_MEM_free(s->init_buf); | |
421 | s->init_buf = NULL; | |
422 | } | |
8723588e MC |
423 | |
424 | ssl_free_wbio_buffer(s); | |
425 | ||
426 | s->init_num = 0; | |
427 | ||
428 | if (!s->server || s->renegotiate == 2) { | |
429 | /* skipped if we just sent a HelloRequest */ | |
430 | s->renegotiate = 0; | |
431 | s->new_session = 0; | |
432 | ||
433 | if (s->server) { | |
8723588e MC |
434 | ssl_update_cache(s, SSL_SESS_CACHE_SERVER); |
435 | ||
436 | s->ctx->stats.sess_accept_good++; | |
fe3a3291 | 437 | s->handshake_func = ossl_statem_accept; |
8723588e MC |
438 | } else { |
439 | ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); | |
440 | if (s->hit) | |
441 | s->ctx->stats.sess_hit++; | |
442 | ||
fe3a3291 | 443 | s->handshake_func = ossl_statem_connect; |
8723588e MC |
444 | s->ctx->stats.sess_connect_good++; |
445 | } | |
446 | ||
447 | if (s->info_callback != NULL) | |
448 | cb = s->info_callback; | |
449 | else if (s->ctx->info_callback != NULL) | |
450 | cb = s->ctx->info_callback; | |
451 | ||
452 | if (cb != NULL) | |
453 | cb(s, SSL_CB_HANDSHAKE_DONE, 1); | |
454 | ||
455 | if (SSL_IS_DTLS(s)) { | |
456 | /* done with handshaking */ | |
457 | s->d1->handshake_read_seq = 0; | |
458 | s->d1->handshake_write_seq = 0; | |
459 | s->d1->next_handshake_write_seq = 0; | |
f5c7f5df | 460 | dtls1_clear_received_buffer(s); |
8723588e MC |
461 | } |
462 | } | |
463 | ||
464 | return WORK_FINISHED_STOP; | |
465 | } | |
466 | ||
9ab930b2 MC |
467 | int tls_get_message_header(SSL *s, int *mt) |
468 | { | |
469 | /* s->init_num < SSL3_HM_HEADER_LENGTH */ | |
470 | int skip_message, i, recvd_type, al; | |
471 | unsigned char *p; | |
54105ddd | 472 | size_t l, readbytes; |
9ab930b2 MC |
473 | |
474 | p = (unsigned char *)s->init_buf->data; | |
475 | ||
476 | do { | |
477 | while (s->init_num < SSL3_HM_HEADER_LENGTH) { | |
478 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &recvd_type, | |
a230b26e EK |
479 | &p[s->init_num], |
480 | SSL3_HM_HEADER_LENGTH - s->init_num, | |
54105ddd | 481 | 0, &readbytes); |
9ab930b2 MC |
482 | if (i <= 0) { |
483 | s->rwstate = SSL_READING; | |
484 | return 0; | |
32ec4153 | 485 | } |
9ab930b2 | 486 | if (recvd_type == SSL3_RT_CHANGE_CIPHER_SPEC) { |
1257adec | 487 | /* |
a230b26e EK |
488 | * A ChangeCipherSpec must be a single byte and may not occur |
489 | * in the middle of a handshake message. | |
490 | */ | |
54105ddd | 491 | if (s->init_num != 0 || readbytes != 1 || p[0] != SSL3_MT_CCS) { |
1257adec DB |
492 | al = SSL_AD_UNEXPECTED_MESSAGE; |
493 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, | |
494 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
495 | goto f_err; | |
496 | } | |
9ab930b2 | 497 | s->s3->tmp.message_type = *mt = SSL3_MT_CHANGE_CIPHER_SPEC; |
54105ddd | 498 | s->init_num = readbytes - 1; |
c4377574 | 499 | s->init_msg = s->init_buf->data; |
54105ddd | 500 | s->s3->tmp.message_size = readbytes; |
9ab930b2 MC |
501 | return 1; |
502 | } else if (recvd_type != SSL3_RT_HANDSHAKE) { | |
503 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
504 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_CCS_RECEIVED_EARLY); | |
32ec4153 MC |
505 | goto f_err; |
506 | } | |
54105ddd | 507 | s->init_num += readbytes; |
9ab930b2 MC |
508 | } |
509 | ||
510 | skip_message = 0; | |
511 | if (!s->server) | |
512 | if (p[0] == SSL3_MT_HELLO_REQUEST) | |
513 | /* | |
514 | * The server may always send 'Hello Request' messages -- | |
515 | * we are doing a handshake anyway now, so ignore them if | |
516 | * their format is correct. Does not count for 'Finished' | |
517 | * MAC. | |
518 | */ | |
519 | if (p[1] == 0 && p[2] == 0 && p[3] == 0) { | |
520 | s->init_num = 0; | |
521 | skip_message = 1; | |
522 | ||
523 | if (s->msg_callback) | |
524 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
525 | p, SSL3_HM_HEADER_LENGTH, s, | |
526 | s->msg_callback_arg); | |
527 | } | |
528 | } while (skip_message); | |
529 | /* s->init_num == SSL3_HM_HEADER_LENGTH */ | |
530 | ||
531 | *mt = *p; | |
532 | s->s3->tmp.message_type = *(p++); | |
32ec4153 | 533 | |
e8aa8b6c | 534 | if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { |
9ab930b2 MC |
535 | /* |
536 | * Only happens with SSLv3+ in an SSLv2 backward compatible | |
537 | * ClientHello | |
e8aa8b6c F |
538 | * |
539 | * Total message size is the remaining record bytes to read | |
540 | * plus the SSL3_HM_HEADER_LENGTH bytes that we already read | |
9ab930b2 | 541 | */ |
9ab930b2 MC |
542 | l = RECORD_LAYER_get_rrec_length(&s->rlayer) |
543 | + SSL3_HM_HEADER_LENGTH; | |
9ab930b2 MC |
544 | s->s3->tmp.message_size = l; |
545 | ||
546 | s->init_msg = s->init_buf->data; | |
547 | s->init_num = SSL3_HM_HEADER_LENGTH; | |
548 | } else { | |
549 | n2l3(p, l); | |
550 | /* BUF_MEM_grow takes an 'int' parameter */ | |
551 | if (l > (INT_MAX - SSL3_HM_HEADER_LENGTH)) { | |
552 | al = SSL_AD_ILLEGAL_PARAMETER; | |
553 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
554 | goto f_err; | |
32ec4153 | 555 | } |
9ab930b2 MC |
556 | s->s3->tmp.message_size = l; |
557 | ||
558 | s->init_msg = s->init_buf->data + SSL3_HM_HEADER_LENGTH; | |
559 | s->init_num = 0; | |
560 | } | |
561 | ||
562 | return 1; | |
563 | f_err: | |
564 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
9ab930b2 MC |
565 | return 0; |
566 | } | |
567 | ||
eda75751 | 568 | int tls_get_message_body(SSL *s, size_t *len) |
9ab930b2 | 569 | { |
54105ddd | 570 | size_t n, readbytes; |
9ab930b2 MC |
571 | unsigned char *p; |
572 | int i; | |
573 | ||
574 | if (s->s3->tmp.message_type == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
575 | /* We've already read everything in */ | |
576 | *len = (unsigned long)s->init_num; | |
577 | return 1; | |
0f113f3e MC |
578 | } |
579 | ||
0f113f3e MC |
580 | p = s->init_msg; |
581 | n = s->s3->tmp.message_size - s->init_num; | |
582 | while (n > 0) { | |
657da85e | 583 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL, |
54105ddd | 584 | &p[s->init_num], n, 0, &readbytes); |
0f113f3e MC |
585 | if (i <= 0) { |
586 | s->rwstate = SSL_READING; | |
9ab930b2 MC |
587 | *len = 0; |
588 | return 0; | |
0f113f3e | 589 | } |
54105ddd MC |
590 | s->init_num += readbytes; |
591 | n -= readbytes; | |
0f113f3e | 592 | } |
ee2ffc27 | 593 | |
bf48836c | 594 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
595 | /* |
596 | * If receiving Finished, record MAC of prior handshake messages for | |
597 | * Finished verification. | |
598 | */ | |
599 | if (*s->init_buf->data == SSL3_MT_FINISHED) | |
600 | ssl3_take_mac(s); | |
ee2ffc27 BL |
601 | #endif |
602 | ||
0f113f3e | 603 | /* Feed this message into MAC computation. */ |
e8aa8b6c | 604 | if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { |
d166ed8c DSH |
605 | if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, |
606 | s->init_num)) { | |
607 | SSLerr(SSL_F_TLS_GET_MESSAGE_BODY, ERR_R_EVP_LIB); | |
608 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
609 | *len = 0; | |
610 | return 0; | |
611 | } | |
32ec4153 | 612 | if (s->msg_callback) |
a230b26e | 613 | s->msg_callback(0, SSL2_VERSION, 0, s->init_buf->data, |
32ec4153 MC |
614 | (size_t)s->init_num, s, s->msg_callback_arg); |
615 | } else { | |
d166ed8c | 616 | if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, |
a230b26e | 617 | s->init_num + SSL3_HM_HEADER_LENGTH)) { |
d166ed8c DSH |
618 | SSLerr(SSL_F_TLS_GET_MESSAGE_BODY, ERR_R_EVP_LIB); |
619 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
620 | *len = 0; | |
621 | return 0; | |
622 | } | |
32ec4153 MC |
623 | if (s->msg_callback) |
624 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, | |
625 | (size_t)s->init_num + SSL3_HM_HEADER_LENGTH, s, | |
626 | s->msg_callback_arg); | |
627 | } | |
628 | ||
eda75751 | 629 | *len = s->init_num; |
9ab930b2 | 630 | return 1; |
0f113f3e | 631 | } |
d02b48c6 | 632 | |
2e5ead83 | 633 | int ssl_cert_type(const X509 *x, const EVP_PKEY *pk) |
0f113f3e | 634 | { |
a230b26e | 635 | if (pk == NULL && (pk = X509_get0_pubkey(x)) == NULL) |
17a72388 VD |
636 | return -1; |
637 | ||
638 | switch (EVP_PKEY_id(pk)) { | |
639 | default: | |
640 | return -1; | |
641 | case EVP_PKEY_RSA: | |
642 | return SSL_PKEY_RSA_ENC; | |
643 | case EVP_PKEY_DSA: | |
644 | return SSL_PKEY_DSA_SIGN; | |
ea262260 | 645 | #ifndef OPENSSL_NO_EC |
17a72388 VD |
646 | case EVP_PKEY_EC: |
647 | return SSL_PKEY_ECC; | |
ea262260 | 648 | #endif |
2a9b9654 | 649 | #ifndef OPENSSL_NO_GOST |
17a72388 VD |
650 | case NID_id_GostR3410_2001: |
651 | return SSL_PKEY_GOST01; | |
652 | case NID_id_GostR3410_2012_256: | |
653 | return SSL_PKEY_GOST12_256; | |
654 | case NID_id_GostR3410_2012_512: | |
655 | return SSL_PKEY_GOST12_512; | |
2a9b9654 | 656 | #endif |
82049c54 | 657 | } |
0f113f3e | 658 | } |
d02b48c6 | 659 | |
6b691a5c | 660 | int ssl_verify_alarm_type(long type) |
0f113f3e MC |
661 | { |
662 | int al; | |
663 | ||
664 | switch (type) { | |
665 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: | |
666 | case X509_V_ERR_UNABLE_TO_GET_CRL: | |
667 | case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: | |
668 | al = SSL_AD_UNKNOWN_CA; | |
669 | break; | |
670 | case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: | |
671 | case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: | |
672 | case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: | |
673 | case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: | |
674 | case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: | |
675 | case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: | |
676 | case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: | |
677 | case X509_V_ERR_CERT_NOT_YET_VALID: | |
678 | case X509_V_ERR_CRL_NOT_YET_VALID: | |
679 | case X509_V_ERR_CERT_UNTRUSTED: | |
680 | case X509_V_ERR_CERT_REJECTED: | |
f3e235ed VD |
681 | case X509_V_ERR_HOSTNAME_MISMATCH: |
682 | case X509_V_ERR_EMAIL_MISMATCH: | |
683 | case X509_V_ERR_IP_ADDRESS_MISMATCH: | |
684 | case X509_V_ERR_DANE_NO_MATCH: | |
685 | case X509_V_ERR_EE_KEY_TOO_SMALL: | |
686 | case X509_V_ERR_CA_KEY_TOO_SMALL: | |
687 | case X509_V_ERR_CA_MD_TOO_WEAK: | |
0f113f3e MC |
688 | al = SSL_AD_BAD_CERTIFICATE; |
689 | break; | |
690 | case X509_V_ERR_CERT_SIGNATURE_FAILURE: | |
691 | case X509_V_ERR_CRL_SIGNATURE_FAILURE: | |
692 | al = SSL_AD_DECRYPT_ERROR; | |
693 | break; | |
694 | case X509_V_ERR_CERT_HAS_EXPIRED: | |
695 | case X509_V_ERR_CRL_HAS_EXPIRED: | |
696 | al = SSL_AD_CERTIFICATE_EXPIRED; | |
697 | break; | |
698 | case X509_V_ERR_CERT_REVOKED: | |
699 | al = SSL_AD_CERTIFICATE_REVOKED; | |
700 | break; | |
f3e235ed | 701 | case X509_V_ERR_UNSPECIFIED: |
0f113f3e | 702 | case X509_V_ERR_OUT_OF_MEM: |
f3e235ed VD |
703 | case X509_V_ERR_INVALID_CALL: |
704 | case X509_V_ERR_STORE_LOOKUP: | |
0f113f3e MC |
705 | al = SSL_AD_INTERNAL_ERROR; |
706 | break; | |
707 | case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: | |
708 | case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: | |
709 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: | |
710 | case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: | |
711 | case X509_V_ERR_CERT_CHAIN_TOO_LONG: | |
712 | case X509_V_ERR_PATH_LENGTH_EXCEEDED: | |
713 | case X509_V_ERR_INVALID_CA: | |
714 | al = SSL_AD_UNKNOWN_CA; | |
715 | break; | |
716 | case X509_V_ERR_APPLICATION_VERIFICATION: | |
717 | al = SSL_AD_HANDSHAKE_FAILURE; | |
718 | break; | |
719 | case X509_V_ERR_INVALID_PURPOSE: | |
720 | al = SSL_AD_UNSUPPORTED_CERTIFICATE; | |
721 | break; | |
722 | default: | |
723 | al = SSL_AD_CERTIFICATE_UNKNOWN; | |
724 | break; | |
725 | } | |
726 | return (al); | |
727 | } | |
d02b48c6 | 728 | |
b362ccab | 729 | int ssl_allow_compression(SSL *s) |
0f113f3e MC |
730 | { |
731 | if (s->options & SSL_OP_NO_COMPRESSION) | |
732 | return 0; | |
733 | return ssl_security(s, SSL_SECOP_COMPRESSION, 0, 0, NULL); | |
734 | } | |
4fa52141 | 735 | |
068c358a | 736 | static int version_cmp(const SSL *s, int a, int b) |
4fa52141 VD |
737 | { |
738 | int dtls = SSL_IS_DTLS(s); | |
739 | ||
740 | if (a == b) | |
741 | return 0; | |
742 | if (!dtls) | |
743 | return a < b ? -1 : 1; | |
744 | return DTLS_VERSION_LT(a, b) ? -1 : 1; | |
745 | } | |
746 | ||
747 | typedef struct { | |
748 | int version; | |
a230b26e EK |
749 | const SSL_METHOD *(*cmeth) (void); |
750 | const SSL_METHOD *(*smeth) (void); | |
4fa52141 VD |
751 | } version_info; |
752 | ||
582a17d6 MC |
753 | #if TLS_MAX_VERSION != TLS1_3_VERSION |
754 | # error Code needs update for TLS_method() support beyond TLS1_3_VERSION. | |
4fa52141 VD |
755 | #endif |
756 | ||
757 | static const version_info tls_version_table[] = { | |
582a17d6 MC |
758 | #ifndef OPENSSL_NO_TLS1_3 |
759 | {TLS1_3_VERSION, tlsv1_3_client_method, tlsv1_3_server_method}, | |
760 | #else | |
761 | {TLS1_3_VERSION, NULL, NULL}, | |
762 | #endif | |
6b01bed2 | 763 | #ifndef OPENSSL_NO_TLS1_2 |
a230b26e | 764 | {TLS1_2_VERSION, tlsv1_2_client_method, tlsv1_2_server_method}, |
6b01bed2 | 765 | #else |
a230b26e | 766 | {TLS1_2_VERSION, NULL, NULL}, |
6b01bed2 VD |
767 | #endif |
768 | #ifndef OPENSSL_NO_TLS1_1 | |
a230b26e | 769 | {TLS1_1_VERSION, tlsv1_1_client_method, tlsv1_1_server_method}, |
6b01bed2 | 770 | #else |
a230b26e | 771 | {TLS1_1_VERSION, NULL, NULL}, |
6b01bed2 VD |
772 | #endif |
773 | #ifndef OPENSSL_NO_TLS1 | |
a230b26e | 774 | {TLS1_VERSION, tlsv1_client_method, tlsv1_server_method}, |
6b01bed2 | 775 | #else |
a230b26e | 776 | {TLS1_VERSION, NULL, NULL}, |
6b01bed2 | 777 | #endif |
4fa52141 | 778 | #ifndef OPENSSL_NO_SSL3 |
a230b26e | 779 | {SSL3_VERSION, sslv3_client_method, sslv3_server_method}, |
6b01bed2 | 780 | #else |
a230b26e | 781 | {SSL3_VERSION, NULL, NULL}, |
4fa52141 | 782 | #endif |
a230b26e | 783 | {0, NULL, NULL}, |
4fa52141 VD |
784 | }; |
785 | ||
786 | #if DTLS_MAX_VERSION != DTLS1_2_VERSION | |
787 | # error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION. | |
788 | #endif | |
789 | ||
790 | static const version_info dtls_version_table[] = { | |
6b01bed2 | 791 | #ifndef OPENSSL_NO_DTLS1_2 |
a230b26e | 792 | {DTLS1_2_VERSION, dtlsv1_2_client_method, dtlsv1_2_server_method}, |
6b01bed2 | 793 | #else |
a230b26e | 794 | {DTLS1_2_VERSION, NULL, NULL}, |
6b01bed2 VD |
795 | #endif |
796 | #ifndef OPENSSL_NO_DTLS1 | |
a230b26e EK |
797 | {DTLS1_VERSION, dtlsv1_client_method, dtlsv1_server_method}, |
798 | {DTLS1_BAD_VER, dtls_bad_ver_client_method, NULL}, | |
6b01bed2 | 799 | #else |
a230b26e EK |
800 | {DTLS1_VERSION, NULL, NULL}, |
801 | {DTLS1_BAD_VER, NULL, NULL}, | |
6b01bed2 | 802 | #endif |
a230b26e | 803 | {0, NULL, NULL}, |
4fa52141 VD |
804 | }; |
805 | ||
806 | /* | |
807 | * ssl_method_error - Check whether an SSL_METHOD is enabled. | |
808 | * | |
809 | * @s: The SSL handle for the candidate method | |
810 | * @method: the intended method. | |
811 | * | |
812 | * Returns 0 on success, or an SSL error reason on failure. | |
813 | */ | |
068c358a | 814 | static int ssl_method_error(const SSL *s, const SSL_METHOD *method) |
4fa52141 VD |
815 | { |
816 | int version = method->version; | |
817 | ||
818 | if ((s->min_proto_version != 0 && | |
819 | version_cmp(s, version, s->min_proto_version) < 0) || | |
820 | ssl_security(s, SSL_SECOP_VERSION, 0, version, NULL) == 0) | |
821 | return SSL_R_VERSION_TOO_LOW; | |
822 | ||
823 | if (s->max_proto_version != 0 && | |
a230b26e | 824 | version_cmp(s, version, s->max_proto_version) > 0) |
4fa52141 VD |
825 | return SSL_R_VERSION_TOO_HIGH; |
826 | ||
827 | if ((s->options & method->mask) != 0) | |
828 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
829 | if ((method->flags & SSL_METHOD_NO_SUITEB) != 0 && tls1_suiteb(s)) | |
830 | return SSL_R_AT_LEAST_TLS_1_2_NEEDED_IN_SUITEB_MODE; | |
831 | else if ((method->flags & SSL_METHOD_NO_FIPS) != 0 && FIPS_mode()) | |
832 | return SSL_R_AT_LEAST_TLS_1_0_NEEDED_IN_FIPS_MODE; | |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
ccae4a15 FI |
837 | /* |
838 | * ssl_version_supported - Check that the specified `version` is supported by | |
839 | * `SSL *` instance | |
840 | * | |
841 | * @s: The SSL handle for the candidate method | |
842 | * @version: Protocol version to test against | |
843 | * | |
844 | * Returns 1 when supported, otherwise 0 | |
845 | */ | |
846 | int ssl_version_supported(const SSL *s, int version) | |
847 | { | |
848 | const version_info *vent; | |
849 | const version_info *table; | |
850 | ||
851 | switch (s->method->version) { | |
852 | default: | |
853 | /* Version should match method version for non-ANY method */ | |
854 | return version_cmp(s, version, s->version) == 0; | |
855 | case TLS_ANY_VERSION: | |
856 | table = tls_version_table; | |
857 | break; | |
858 | case DTLS_ANY_VERSION: | |
859 | table = dtls_version_table; | |
860 | break; | |
861 | } | |
862 | ||
863 | for (vent = table; | |
864 | vent->version != 0 && version_cmp(s, version, vent->version) <= 0; | |
865 | ++vent) { | |
866 | if (vent->cmeth != NULL && | |
867 | version_cmp(s, version, vent->version) == 0 && | |
868 | ssl_method_error(s, vent->cmeth()) == 0) { | |
869 | return 1; | |
870 | } | |
871 | } | |
872 | return 0; | |
873 | } | |
874 | ||
4fa52141 VD |
875 | /* |
876 | * ssl_check_version_downgrade - In response to RFC7507 SCSV version | |
877 | * fallback indication from a client check whether we're using the highest | |
878 | * supported protocol version. | |
879 | * | |
880 | * @s server SSL handle. | |
881 | * | |
882 | * Returns 1 when using the highest enabled version, 0 otherwise. | |
883 | */ | |
884 | int ssl_check_version_downgrade(SSL *s) | |
885 | { | |
886 | const version_info *vent; | |
887 | const version_info *table; | |
888 | ||
889 | /* | |
890 | * Check that the current protocol is the highest enabled version | |
891 | * (according to s->ctx->method, as version negotiation may have changed | |
892 | * s->method). | |
893 | */ | |
894 | if (s->version == s->ctx->method->version) | |
895 | return 1; | |
896 | ||
897 | /* | |
898 | * Apparently we're using a version-flexible SSL_METHOD (not at its | |
899 | * highest protocol version). | |
900 | */ | |
901 | if (s->ctx->method->version == TLS_method()->version) | |
902 | table = tls_version_table; | |
903 | else if (s->ctx->method->version == DTLS_method()->version) | |
904 | table = dtls_version_table; | |
905 | else { | |
906 | /* Unexpected state; fail closed. */ | |
907 | return 0; | |
908 | } | |
909 | ||
910 | for (vent = table; vent->version != 0; ++vent) { | |
a230b26e | 911 | if (vent->smeth != NULL && ssl_method_error(s, vent->smeth()) == 0) |
4fa52141 VD |
912 | return s->version == vent->version; |
913 | } | |
914 | return 0; | |
915 | } | |
916 | ||
917 | /* | |
918 | * ssl_set_version_bound - set an upper or lower bound on the supported (D)TLS | |
919 | * protocols, provided the initial (D)TLS method is version-flexible. This | |
920 | * function sanity-checks the proposed value and makes sure the method is | |
921 | * version-flexible, then sets the limit if all is well. | |
922 | * | |
923 | * @method_version: The version of the current SSL_METHOD. | |
924 | * @version: the intended limit. | |
925 | * @bound: pointer to limit to be updated. | |
926 | * | |
927 | * Returns 1 on success, 0 on failure. | |
928 | */ | |
929 | int ssl_set_version_bound(int method_version, int version, int *bound) | |
930 | { | |
869e978c KR |
931 | if (version == 0) { |
932 | *bound = version; | |
933 | return 1; | |
934 | } | |
935 | ||
4fa52141 VD |
936 | /*- |
937 | * Restrict TLS methods to TLS protocol versions. | |
938 | * Restrict DTLS methods to DTLS protocol versions. | |
939 | * Note, DTLS version numbers are decreasing, use comparison macros. | |
940 | * | |
941 | * Note that for both lower-bounds we use explicit versions, not | |
942 | * (D)TLS_MIN_VERSION. This is because we don't want to break user | |
943 | * configurations. If the MIN (supported) version ever rises, the user's | |
944 | * "floor" remains valid even if no longer available. We don't expect the | |
945 | * MAX ceiling to ever get lower, so making that variable makes sense. | |
946 | */ | |
947 | switch (method_version) { | |
948 | default: | |
949 | /* | |
950 | * XXX For fixed version methods, should we always fail and not set any | |
951 | * bounds, always succeed and not set any bounds, or set the bounds and | |
952 | * arrange to fail later if they are not met? At present fixed-version | |
953 | * methods are not subject to controls that disable individual protocol | |
954 | * versions. | |
955 | */ | |
956 | return 0; | |
957 | ||
958 | case TLS_ANY_VERSION: | |
959 | if (version < SSL3_VERSION || version > TLS_MAX_VERSION) | |
960 | return 0; | |
961 | break; | |
962 | ||
963 | case DTLS_ANY_VERSION: | |
964 | if (DTLS_VERSION_GT(version, DTLS_MAX_VERSION) || | |
032924c4 | 965 | DTLS_VERSION_LT(version, DTLS1_BAD_VER)) |
4fa52141 VD |
966 | return 0; |
967 | break; | |
968 | } | |
969 | ||
970 | *bound = version; | |
971 | return 1; | |
972 | } | |
973 | ||
974 | /* | |
975 | * ssl_choose_server_version - Choose server (D)TLS version. Called when the | |
976 | * client HELLO is received to select the final server protocol version and | |
977 | * the version specific method. | |
978 | * | |
979 | * @s: server SSL handle. | |
980 | * | |
981 | * Returns 0 on success or an SSL error reason number on failure. | |
982 | */ | |
1ab3836b | 983 | int ssl_choose_server_version(SSL *s, CLIENTHELLO_MSG *hello) |
4fa52141 VD |
984 | { |
985 | /*- | |
986 | * With version-flexible methods we have an initial state with: | |
987 | * | |
988 | * s->method->version == (D)TLS_ANY_VERSION, | |
989 | * s->version == (D)TLS_MAX_VERSION. | |
990 | * | |
991 | * So we detect version-flexible methods via the method version, not the | |
992 | * handle version. | |
993 | */ | |
994 | int server_version = s->method->version; | |
df7ce507 | 995 | int client_version = hello->legacy_version; |
4fa52141 VD |
996 | const version_info *vent; |
997 | const version_info *table; | |
998 | int disabled = 0; | |
cd998837 | 999 | RAW_EXTENSION *suppversions; |
4fa52141 | 1000 | |
1ab3836b MC |
1001 | s->client_version = client_version; |
1002 | ||
4fa52141 VD |
1003 | switch (server_version) { |
1004 | default: | |
1005 | if (version_cmp(s, client_version, s->version) < 0) | |
1006 | return SSL_R_WRONG_SSL_VERSION; | |
1007 | /* | |
1008 | * If this SSL handle is not from a version flexible method we don't | |
1009 | * (and never did) check min/max FIPS or Suite B constraints. Hope | |
1010 | * that's OK. It is up to the caller to not choose fixed protocol | |
1011 | * versions they don't want. If not, then easy to fix, just return | |
1012 | * ssl_method_error(s, s->method) | |
1013 | */ | |
1014 | return 0; | |
1015 | case TLS_ANY_VERSION: | |
1016 | table = tls_version_table; | |
1017 | break; | |
1018 | case DTLS_ANY_VERSION: | |
1019 | table = dtls_version_table; | |
1020 | break; | |
1021 | } | |
1022 | ||
cd998837 MC |
1023 | suppversions = tls_get_extension_by_type(hello->pre_proc_exts, |
1024 | hello->num_extensions, | |
1025 | TLSEXT_TYPE_supported_versions); | |
1026 | ||
7b21c00e | 1027 | if (suppversions != NULL && !SSL_IS_DTLS(s)) { |
cd998837 MC |
1028 | unsigned int candidate_vers = 0; |
1029 | unsigned int best_vers = 0; | |
1030 | const SSL_METHOD *best_method = NULL; | |
1031 | PACKET versionslist; | |
1032 | ||
16bce0e0 | 1033 | if (!PACKET_as_length_prefixed_1(&suppversions->data, &versionslist)) { |
cd998837 MC |
1034 | /* Trailing or invalid data? */ |
1035 | return SSL_R_LENGTH_MISMATCH; | |
1036 | } | |
1037 | ||
1038 | while (PACKET_get_net_2(&versionslist, &candidate_vers)) { | |
1039 | /* TODO(TLS1.3): Remove this before release */ | |
1040 | if (candidate_vers == TLS1_3_VERSION_DRAFT) | |
1041 | candidate_vers = TLS1_3_VERSION; | |
1042 | if ((int)candidate_vers > s->client_version) | |
1043 | s->client_version = candidate_vers; | |
1044 | if (version_cmp(s, candidate_vers, best_vers) <= 0) | |
1045 | continue; | |
1046 | for (vent = table; | |
1047 | vent->version != 0 && vent->version != (int)candidate_vers; | |
16bce0e0 | 1048 | ++vent) |
bf0ba5e7 | 1049 | continue; |
bf85ef1b | 1050 | if (vent->version != 0 && vent->smeth != NULL) { |
cd998837 MC |
1051 | const SSL_METHOD *method; |
1052 | ||
1053 | method = vent->smeth(); | |
1054 | if (ssl_method_error(s, method) == 0) { | |
1055 | best_vers = candidate_vers; | |
1056 | best_method = method; | |
1057 | } | |
1058 | } | |
1059 | } | |
1060 | if (PACKET_remaining(&versionslist) != 0) { | |
1061 | /* Trailing data? */ | |
1062 | return SSL_R_LENGTH_MISMATCH; | |
1063 | } | |
1064 | ||
1065 | if (best_vers > 0) { | |
1066 | s->version = best_vers; | |
1067 | s->method = best_method; | |
1068 | return 0; | |
1069 | } | |
1070 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * If the supported versions extension isn't present, then the highest | |
1075 | * version we can negotiate is TLSv1.2 | |
1076 | */ | |
1077 | if (version_cmp(s, client_version, TLS1_3_VERSION) >= 0) | |
1078 | client_version = TLS1_2_VERSION; | |
1079 | ||
1080 | /* | |
1081 | * No supported versions extension, so we just use the version supplied in | |
1082 | * the ClientHello. | |
1083 | */ | |
4fa52141 VD |
1084 | for (vent = table; vent->version != 0; ++vent) { |
1085 | const SSL_METHOD *method; | |
1086 | ||
1087 | if (vent->smeth == NULL || | |
1088 | version_cmp(s, client_version, vent->version) < 0) | |
1089 | continue; | |
1090 | method = vent->smeth(); | |
1091 | if (ssl_method_error(s, method) == 0) { | |
1092 | s->version = vent->version; | |
1093 | s->method = method; | |
1094 | return 0; | |
1095 | } | |
1096 | disabled = 1; | |
1097 | } | |
1098 | return disabled ? SSL_R_UNSUPPORTED_PROTOCOL : SSL_R_VERSION_TOO_LOW; | |
1099 | } | |
1100 | ||
1101 | /* | |
1102 | * ssl_choose_client_version - Choose client (D)TLS version. Called when the | |
1103 | * server HELLO is received to select the final client protocol version and | |
1104 | * the version specific method. | |
1105 | * | |
1106 | * @s: client SSL handle. | |
1107 | * @version: The proposed version from the server's HELLO. | |
1108 | * | |
1109 | * Returns 0 on success or an SSL error reason number on failure. | |
1110 | */ | |
1111 | int ssl_choose_client_version(SSL *s, int version) | |
1112 | { | |
1113 | const version_info *vent; | |
1114 | const version_info *table; | |
1115 | ||
1116 | switch (s->method->version) { | |
1117 | default: | |
1118 | if (version != s->version) | |
1119 | return SSL_R_WRONG_SSL_VERSION; | |
1120 | /* | |
1121 | * If this SSL handle is not from a version flexible method we don't | |
1122 | * (and never did) check min/max, FIPS or Suite B constraints. Hope | |
1123 | * that's OK. It is up to the caller to not choose fixed protocol | |
1124 | * versions they don't want. If not, then easy to fix, just return | |
1125 | * ssl_method_error(s, s->method) | |
1126 | */ | |
4fa52141 VD |
1127 | return 0; |
1128 | case TLS_ANY_VERSION: | |
1129 | table = tls_version_table; | |
1130 | break; | |
1131 | case DTLS_ANY_VERSION: | |
1132 | table = dtls_version_table; | |
1133 | break; | |
1134 | } | |
1135 | ||
1136 | for (vent = table; vent->version != 0; ++vent) { | |
1137 | const SSL_METHOD *method; | |
1138 | int err; | |
1139 | ||
1140 | if (version != vent->version) | |
1141 | continue; | |
1142 | if (vent->cmeth == NULL) | |
1143 | break; | |
1144 | method = vent->cmeth(); | |
1145 | err = ssl_method_error(s, method); | |
1146 | if (err != 0) | |
1147 | return err; | |
1148 | s->method = method; | |
ccae4a15 | 1149 | s->version = version; |
4fa52141 VD |
1150 | return 0; |
1151 | } | |
1152 | ||
1153 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
1154 | } | |
1155 | ||
068c358a KR |
1156 | /* |
1157 | * ssl_get_client_min_max_version - get minimum and maximum client version | |
1158 | * @s: The SSL connection | |
1159 | * @min_version: The minimum supported version | |
1160 | * @max_version: The maximum supported version | |
1161 | * | |
1162 | * Work out what version we should be using for the initial ClientHello if the | |
1163 | * version is initially (D)TLS_ANY_VERSION. We apply any explicit SSL_OP_NO_xxx | |
1164 | * options, the MinProtocol and MaxProtocol configuration commands, any Suite B | |
1165 | * or FIPS_mode() constraints and any floor imposed by the security level here, | |
1166 | * so we don't advertise the wrong protocol version to only reject the outcome later. | |
4fa52141 | 1167 | * |
0485d540 | 1168 | * Computing the right floor matters. If, e.g., TLS 1.0 and 1.2 are enabled, |
4fa52141 VD |
1169 | * TLS 1.1 is disabled, but the security level, Suite-B and/or MinProtocol |
1170 | * only allow TLS 1.2, we want to advertise TLS1.2, *not* TLS1. | |
1171 | * | |
068c358a KR |
1172 | * Returns 0 on success or an SSL error reason number on failure. On failure |
1173 | * min_version and max_version will also be set to 0. | |
4fa52141 | 1174 | */ |
a230b26e EK |
1175 | int ssl_get_client_min_max_version(const SSL *s, int *min_version, |
1176 | int *max_version) | |
4fa52141 VD |
1177 | { |
1178 | int version; | |
1179 | int hole; | |
1180 | const SSL_METHOD *single = NULL; | |
1181 | const SSL_METHOD *method; | |
1182 | const version_info *table; | |
1183 | const version_info *vent; | |
1184 | ||
1185 | switch (s->method->version) { | |
1186 | default: | |
1187 | /* | |
1188 | * If this SSL handle is not from a version flexible method we don't | |
1189 | * (and never did) check min/max FIPS or Suite B constraints. Hope | |
1190 | * that's OK. It is up to the caller to not choose fixed protocol | |
1191 | * versions they don't want. If not, then easy to fix, just return | |
1192 | * ssl_method_error(s, s->method) | |
1193 | */ | |
068c358a | 1194 | *min_version = *max_version = s->version; |
4fa52141 VD |
1195 | return 0; |
1196 | case TLS_ANY_VERSION: | |
1197 | table = tls_version_table; | |
1198 | break; | |
1199 | case DTLS_ANY_VERSION: | |
1200 | table = dtls_version_table; | |
1201 | break; | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * SSL_OP_NO_X disables all protocols above X *if* there are some protocols | |
1206 | * below X enabled. This is required in order to maintain the "version | |
1207 | * capability" vector contiguous. Any versions with a NULL client method | |
1208 | * (protocol version client is disabled at compile-time) is also a "hole". | |
1209 | * | |
1210 | * Our initial state is hole == 1, version == 0. That is, versions above | |
1211 | * the first version in the method table are disabled (a "hole" above | |
1212 | * the valid protocol entries) and we don't have a selected version yet. | |
1213 | * | |
1214 | * Whenever "hole == 1", and we hit an enabled method, its version becomes | |
1215 | * the selected version, and the method becomes a candidate "single" | |
1216 | * method. We're no longer in a hole, so "hole" becomes 0. | |
1217 | * | |
1218 | * If "hole == 0" and we hit an enabled method, then "single" is cleared, | |
1219 | * as we support a contiguous range of at least two methods. If we hit | |
1220 | * a disabled method, then hole becomes true again, but nothing else | |
1221 | * changes yet, because all the remaining methods may be disabled too. | |
1222 | * If we again hit an enabled method after the new hole, it becomes | |
1223 | * selected, as we start from scratch. | |
1224 | */ | |
068c358a | 1225 | *min_version = version = 0; |
4fa52141 VD |
1226 | hole = 1; |
1227 | for (vent = table; vent->version != 0; ++vent) { | |
1228 | /* | |
1229 | * A table entry with a NULL client method is still a hole in the | |
1230 | * "version capability" vector. | |
1231 | */ | |
1232 | if (vent->cmeth == NULL) { | |
1233 | hole = 1; | |
1234 | continue; | |
1235 | } | |
1236 | method = vent->cmeth(); | |
1237 | if (ssl_method_error(s, method) != 0) { | |
1238 | hole = 1; | |
1239 | } else if (!hole) { | |
1240 | single = NULL; | |
068c358a | 1241 | *min_version = method->version; |
4fa52141 VD |
1242 | } else { |
1243 | version = (single = method)->version; | |
068c358a | 1244 | *min_version = version; |
4fa52141 VD |
1245 | hole = 0; |
1246 | } | |
1247 | } | |
1248 | ||
068c358a KR |
1249 | *max_version = version; |
1250 | ||
4fa52141 VD |
1251 | /* Fail if everything is disabled */ |
1252 | if (version == 0) | |
1253 | return SSL_R_NO_PROTOCOLS_AVAILABLE; | |
1254 | ||
068c358a KR |
1255 | return 0; |
1256 | } | |
1257 | ||
1258 | /* | |
1259 | * ssl_set_client_hello_version - Work out what version we should be using for | |
1260 | * the initial ClientHello. | |
1261 | * | |
1262 | * @s: client SSL handle. | |
1263 | * | |
1264 | * Returns 0 on success or an SSL error reason number on failure. | |
1265 | */ | |
1266 | int ssl_set_client_hello_version(SSL *s) | |
1267 | { | |
3eb2aff4 | 1268 | int ver_min, ver_max, ret; |
068c358a | 1269 | |
3eb2aff4 | 1270 | ret = ssl_get_client_min_max_version(s, &ver_min, &ver_max); |
068c358a KR |
1271 | |
1272 | if (ret != 0) | |
1273 | return ret; | |
1274 | ||
3eb2aff4 | 1275 | s->client_version = s->version = ver_max; |
4fa52141 VD |
1276 | return 0; |
1277 | } |