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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 | ||
be3583fa | 155 | MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt) |
b9908bf9 MC |
156 | { |
157 | int al; | |
348240c6 | 158 | size_t remain; |
4fa52141 | 159 | |
73999b62 | 160 | remain = PACKET_remaining(pkt); |
657da85e MC |
161 | /* |
162 | * 'Change Cipher Spec' is just a single byte, which should already have | |
c69f2adf MC |
163 | * been consumed by ssl_get_message() so there should be no bytes left, |
164 | * unless we're using DTLS1_BAD_VER, which has an extra 2 bytes | |
657da85e | 165 | */ |
c69f2adf | 166 | if (SSL_IS_DTLS(s)) { |
73999b62 | 167 | if ((s->version == DTLS1_BAD_VER |
a230b26e EK |
168 | && remain != DTLS1_CCS_HEADER_LENGTH + 1) |
169 | || (s->version != DTLS1_BAD_VER | |
170 | && remain != DTLS1_CCS_HEADER_LENGTH - 1)) { | |
171 | al = SSL_AD_ILLEGAL_PARAMETER; | |
172 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, | |
173 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
174 | goto f_err; | |
c69f2adf MC |
175 | } |
176 | } else { | |
73999b62 | 177 | if (remain != 0) { |
c69f2adf | 178 | al = SSL_AD_ILLEGAL_PARAMETER; |
b9908bf9 MC |
179 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, |
180 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
c69f2adf MC |
181 | goto f_err; |
182 | } | |
657da85e MC |
183 | } |
184 | ||
185 | /* Check we have a cipher to change to */ | |
186 | if (s->s3->tmp.new_cipher == NULL) { | |
187 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
b9908bf9 | 188 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, SSL_R_CCS_RECEIVED_EARLY); |
657da85e MC |
189 | goto f_err; |
190 | } | |
191 | ||
192 | s->s3->change_cipher_spec = 1; | |
193 | if (!ssl3_do_change_cipher_spec(s)) { | |
194 | al = SSL_AD_INTERNAL_ERROR; | |
b9908bf9 | 195 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); |
657da85e MC |
196 | goto f_err; |
197 | } | |
198 | ||
c69f2adf MC |
199 | if (SSL_IS_DTLS(s)) { |
200 | dtls1_reset_seq_numbers(s, SSL3_CC_READ); | |
201 | ||
202 | if (s->version == DTLS1_BAD_VER) | |
203 | s->d1->handshake_read_seq++; | |
204 | ||
205 | #ifndef OPENSSL_NO_SCTP | |
206 | /* | |
207 | * Remember that a CCS has been received, so that an old key of | |
208 | * SCTP-Auth can be deleted when a CCS is sent. Will be ignored if no | |
209 | * SCTP is used | |
210 | */ | |
211 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL); | |
212 | #endif | |
213 | } | |
214 | ||
b9908bf9 | 215 | return MSG_PROCESS_CONTINUE_READING; |
657da85e MC |
216 | f_err: |
217 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 218 | ossl_statem_set_error(s); |
b9908bf9 | 219 | return MSG_PROCESS_ERROR; |
657da85e MC |
220 | } |
221 | ||
be3583fa | 222 | MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt) |
b9908bf9 | 223 | { |
7776a36c | 224 | int al = SSL_AD_INTERNAL_ERROR; |
12472b45 | 225 | size_t md_len; |
b9908bf9 | 226 | |
0f113f3e | 227 | /* If this occurs, we have missed a message */ |
92760c21 | 228 | if (!SSL_IS_TLS13(s) && !s->s3->change_cipher_spec) { |
0f113f3e | 229 | al = SSL_AD_UNEXPECTED_MESSAGE; |
b9908bf9 | 230 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_GOT_A_FIN_BEFORE_A_CCS); |
0f113f3e MC |
231 | goto f_err; |
232 | } | |
233 | s->s3->change_cipher_spec = 0; | |
234 | ||
12472b45 | 235 | md_len = s->s3->tmp.peer_finish_md_len; |
0f113f3e | 236 | |
12472b45 | 237 | if (md_len != PACKET_remaining(pkt)) { |
0f113f3e | 238 | al = SSL_AD_DECODE_ERROR; |
b9908bf9 | 239 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_BAD_DIGEST_LENGTH); |
0f113f3e MC |
240 | goto f_err; |
241 | } | |
242 | ||
12472b45 MC |
243 | if (CRYPTO_memcmp(PACKET_data(pkt), s->s3->tmp.peer_finish_md, |
244 | md_len) != 0) { | |
0f113f3e | 245 | al = SSL_AD_DECRYPT_ERROR; |
b9908bf9 | 246 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_DIGEST_CHECK_FAILED); |
0f113f3e MC |
247 | goto f_err; |
248 | } | |
249 | ||
250 | /* | |
251 | * Copy the finished so we can use it for renegotiation checks | |
252 | */ | |
23a635c0 | 253 | if (s->server) { |
12472b45 MC |
254 | OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE); |
255 | memcpy(s->s3->previous_client_finished, s->s3->tmp.peer_finish_md, | |
256 | md_len); | |
257 | s->s3->previous_client_finished_len = md_len; | |
0f113f3e | 258 | } else { |
12472b45 MC |
259 | OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE); |
260 | memcpy(s->s3->previous_server_finished, s->s3->tmp.peer_finish_md, | |
261 | md_len); | |
262 | s->s3->previous_server_finished_len = md_len; | |
0f113f3e MC |
263 | } |
264 | ||
7776a36c MC |
265 | /* |
266 | * In TLS1.3 we also have to change cipher state and do any final processing | |
267 | * of the initial server flight (if we are a client) | |
268 | */ | |
92760c21 MC |
269 | if (SSL_IS_TLS13(s)) { |
270 | if (s->server) { | |
271 | if (!s->method->ssl3_enc->change_cipher_state(s, | |
272 | SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_READ)) { | |
92760c21 MC |
273 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_CANNOT_CHANGE_CIPHER); |
274 | goto f_err; | |
275 | } | |
276 | } else { | |
277 | if (!s->method->ssl3_enc->generate_master_secret(s, | |
278 | s->session->master_key, s->handshake_secret, 0, | |
279 | &s->session->master_key_length)) { | |
92760c21 MC |
280 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_CANNOT_CHANGE_CIPHER); |
281 | goto f_err; | |
282 | } | |
283 | if (!s->method->ssl3_enc->change_cipher_state(s, | |
284 | SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_CLIENT_READ)) { | |
92760c21 MC |
285 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_CANNOT_CHANGE_CIPHER); |
286 | goto f_err; | |
287 | } | |
7776a36c MC |
288 | if (!tls_process_initial_server_flight(s, &al)) |
289 | goto f_err; | |
92760c21 MC |
290 | } |
291 | } | |
292 | ||
e6575156 | 293 | return MSG_PROCESS_FINISHED_READING; |
0f113f3e MC |
294 | f_err: |
295 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 296 | ossl_statem_set_error(s); |
b9908bf9 | 297 | return MSG_PROCESS_ERROR; |
0f113f3e | 298 | } |
d02b48c6 | 299 | |
7cea05dc | 300 | int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt) |
b9908bf9 | 301 | { |
7cea05dc | 302 | if (!WPACKET_put_bytes_u8(pkt, SSL3_MT_CCS)) { |
3c106325 | 303 | SSLerr(SSL_F_TLS_CONSTRUCT_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); |
85a7a5e6 MC |
304 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
305 | return 0; | |
306 | } | |
b9908bf9 | 307 | |
b9908bf9 MC |
308 | return 1; |
309 | } | |
310 | ||
7cea05dc | 311 | unsigned long ssl3_output_cert_chain(SSL *s, WPACKET *pkt, CERT_PKEY *cpk) |
0f113f3e | 312 | { |
5923ad4b | 313 | if (!WPACKET_start_sub_packet_u24(pkt) |
7cea05dc | 314 | || !ssl_add_cert_chain(s, pkt, cpk) |
5923ad4b | 315 | || !WPACKET_close(pkt)) { |
c49e1912 | 316 | SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN, ERR_R_INTERNAL_ERROR); |
7cea05dc | 317 | return 0; |
77d514c5 | 318 | } |
c49e1912 | 319 | return 1; |
0f113f3e MC |
320 | } |
321 | ||
be3583fa | 322 | WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst) |
8723588e MC |
323 | { |
324 | void (*cb) (const SSL *ssl, int type, int val) = NULL; | |
325 | ||
326 | #ifndef OPENSSL_NO_SCTP | |
327 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) { | |
be3583fa | 328 | WORK_STATE ret; |
8723588e MC |
329 | ret = dtls_wait_for_dry(s); |
330 | if (ret != WORK_FINISHED_CONTINUE) | |
331 | return ret; | |
332 | } | |
333 | #endif | |
334 | ||
335 | /* clean a few things up */ | |
336 | ssl3_cleanup_key_block(s); | |
473483d4 MC |
337 | |
338 | if (!SSL_IS_DTLS(s)) { | |
339 | /* | |
340 | * We don't do this in DTLS because we may still need the init_buf | |
341 | * in case there are any unexpected retransmits | |
342 | */ | |
343 | BUF_MEM_free(s->init_buf); | |
344 | s->init_buf = NULL; | |
345 | } | |
8723588e MC |
346 | |
347 | ssl_free_wbio_buffer(s); | |
348 | ||
349 | s->init_num = 0; | |
350 | ||
351 | if (!s->server || s->renegotiate == 2) { | |
352 | /* skipped if we just sent a HelloRequest */ | |
353 | s->renegotiate = 0; | |
354 | s->new_session = 0; | |
355 | ||
356 | if (s->server) { | |
8723588e MC |
357 | ssl_update_cache(s, SSL_SESS_CACHE_SERVER); |
358 | ||
359 | s->ctx->stats.sess_accept_good++; | |
fe3a3291 | 360 | s->handshake_func = ossl_statem_accept; |
8723588e MC |
361 | } else { |
362 | ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); | |
363 | if (s->hit) | |
364 | s->ctx->stats.sess_hit++; | |
365 | ||
fe3a3291 | 366 | s->handshake_func = ossl_statem_connect; |
8723588e MC |
367 | s->ctx->stats.sess_connect_good++; |
368 | } | |
369 | ||
370 | if (s->info_callback != NULL) | |
371 | cb = s->info_callback; | |
372 | else if (s->ctx->info_callback != NULL) | |
373 | cb = s->ctx->info_callback; | |
374 | ||
375 | if (cb != NULL) | |
376 | cb(s, SSL_CB_HANDSHAKE_DONE, 1); | |
377 | ||
378 | if (SSL_IS_DTLS(s)) { | |
379 | /* done with handshaking */ | |
380 | s->d1->handshake_read_seq = 0; | |
381 | s->d1->handshake_write_seq = 0; | |
382 | s->d1->next_handshake_write_seq = 0; | |
f5c7f5df | 383 | dtls1_clear_received_buffer(s); |
8723588e MC |
384 | } |
385 | } | |
386 | ||
387 | return WORK_FINISHED_STOP; | |
388 | } | |
389 | ||
9ab930b2 MC |
390 | int tls_get_message_header(SSL *s, int *mt) |
391 | { | |
392 | /* s->init_num < SSL3_HM_HEADER_LENGTH */ | |
393 | int skip_message, i, recvd_type, al; | |
394 | unsigned char *p; | |
54105ddd | 395 | size_t l, readbytes; |
9ab930b2 MC |
396 | |
397 | p = (unsigned char *)s->init_buf->data; | |
398 | ||
399 | do { | |
400 | while (s->init_num < SSL3_HM_HEADER_LENGTH) { | |
401 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &recvd_type, | |
a230b26e EK |
402 | &p[s->init_num], |
403 | SSL3_HM_HEADER_LENGTH - s->init_num, | |
54105ddd | 404 | 0, &readbytes); |
9ab930b2 MC |
405 | if (i <= 0) { |
406 | s->rwstate = SSL_READING; | |
407 | return 0; | |
32ec4153 | 408 | } |
9ab930b2 | 409 | if (recvd_type == SSL3_RT_CHANGE_CIPHER_SPEC) { |
1257adec | 410 | /* |
a230b26e EK |
411 | * A ChangeCipherSpec must be a single byte and may not occur |
412 | * in the middle of a handshake message. | |
413 | */ | |
54105ddd | 414 | if (s->init_num != 0 || readbytes != 1 || p[0] != SSL3_MT_CCS) { |
1257adec DB |
415 | al = SSL_AD_UNEXPECTED_MESSAGE; |
416 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, | |
417 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
418 | goto f_err; | |
419 | } | |
9ab930b2 | 420 | s->s3->tmp.message_type = *mt = SSL3_MT_CHANGE_CIPHER_SPEC; |
54105ddd | 421 | s->init_num = readbytes - 1; |
c4377574 | 422 | s->init_msg = s->init_buf->data; |
54105ddd | 423 | s->s3->tmp.message_size = readbytes; |
9ab930b2 MC |
424 | return 1; |
425 | } else if (recvd_type != SSL3_RT_HANDSHAKE) { | |
426 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
427 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_CCS_RECEIVED_EARLY); | |
32ec4153 MC |
428 | goto f_err; |
429 | } | |
54105ddd | 430 | s->init_num += readbytes; |
9ab930b2 MC |
431 | } |
432 | ||
433 | skip_message = 0; | |
434 | if (!s->server) | |
435 | if (p[0] == SSL3_MT_HELLO_REQUEST) | |
436 | /* | |
437 | * The server may always send 'Hello Request' messages -- | |
438 | * we are doing a handshake anyway now, so ignore them if | |
439 | * their format is correct. Does not count for 'Finished' | |
440 | * MAC. | |
441 | */ | |
442 | if (p[1] == 0 && p[2] == 0 && p[3] == 0) { | |
443 | s->init_num = 0; | |
444 | skip_message = 1; | |
445 | ||
446 | if (s->msg_callback) | |
447 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
448 | p, SSL3_HM_HEADER_LENGTH, s, | |
449 | s->msg_callback_arg); | |
450 | } | |
451 | } while (skip_message); | |
452 | /* s->init_num == SSL3_HM_HEADER_LENGTH */ | |
453 | ||
454 | *mt = *p; | |
455 | s->s3->tmp.message_type = *(p++); | |
32ec4153 | 456 | |
e8aa8b6c | 457 | if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { |
9ab930b2 MC |
458 | /* |
459 | * Only happens with SSLv3+ in an SSLv2 backward compatible | |
460 | * ClientHello | |
e8aa8b6c F |
461 | * |
462 | * Total message size is the remaining record bytes to read | |
463 | * plus the SSL3_HM_HEADER_LENGTH bytes that we already read | |
9ab930b2 | 464 | */ |
9ab930b2 MC |
465 | l = RECORD_LAYER_get_rrec_length(&s->rlayer) |
466 | + SSL3_HM_HEADER_LENGTH; | |
9ab930b2 MC |
467 | s->s3->tmp.message_size = l; |
468 | ||
469 | s->init_msg = s->init_buf->data; | |
470 | s->init_num = SSL3_HM_HEADER_LENGTH; | |
471 | } else { | |
472 | n2l3(p, l); | |
473 | /* BUF_MEM_grow takes an 'int' parameter */ | |
474 | if (l > (INT_MAX - SSL3_HM_HEADER_LENGTH)) { | |
475 | al = SSL_AD_ILLEGAL_PARAMETER; | |
476 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
477 | goto f_err; | |
32ec4153 | 478 | } |
9ab930b2 MC |
479 | s->s3->tmp.message_size = l; |
480 | ||
481 | s->init_msg = s->init_buf->data + SSL3_HM_HEADER_LENGTH; | |
482 | s->init_num = 0; | |
483 | } | |
484 | ||
485 | return 1; | |
486 | f_err: | |
487 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
9ab930b2 MC |
488 | return 0; |
489 | } | |
490 | ||
eda75751 | 491 | int tls_get_message_body(SSL *s, size_t *len) |
9ab930b2 | 492 | { |
54105ddd | 493 | size_t n, readbytes; |
9ab930b2 MC |
494 | unsigned char *p; |
495 | int i; | |
496 | ||
497 | if (s->s3->tmp.message_type == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
498 | /* We've already read everything in */ | |
499 | *len = (unsigned long)s->init_num; | |
500 | return 1; | |
0f113f3e MC |
501 | } |
502 | ||
0f113f3e MC |
503 | p = s->init_msg; |
504 | n = s->s3->tmp.message_size - s->init_num; | |
505 | while (n > 0) { | |
657da85e | 506 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL, |
54105ddd | 507 | &p[s->init_num], n, 0, &readbytes); |
0f113f3e MC |
508 | if (i <= 0) { |
509 | s->rwstate = SSL_READING; | |
9ab930b2 MC |
510 | *len = 0; |
511 | return 0; | |
0f113f3e | 512 | } |
54105ddd MC |
513 | s->init_num += readbytes; |
514 | n -= readbytes; | |
0f113f3e | 515 | } |
ee2ffc27 | 516 | |
bf48836c | 517 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
518 | /* |
519 | * If receiving Finished, record MAC of prior handshake messages for | |
520 | * Finished verification. | |
521 | */ | |
522 | if (*s->init_buf->data == SSL3_MT_FINISHED) | |
523 | ssl3_take_mac(s); | |
ee2ffc27 BL |
524 | #endif |
525 | ||
0f113f3e | 526 | /* Feed this message into MAC computation. */ |
e8aa8b6c | 527 | if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { |
d166ed8c DSH |
528 | if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, |
529 | s->init_num)) { | |
530 | SSLerr(SSL_F_TLS_GET_MESSAGE_BODY, ERR_R_EVP_LIB); | |
531 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
532 | *len = 0; | |
533 | return 0; | |
534 | } | |
32ec4153 | 535 | if (s->msg_callback) |
a230b26e | 536 | s->msg_callback(0, SSL2_VERSION, 0, s->init_buf->data, |
32ec4153 MC |
537 | (size_t)s->init_num, s, s->msg_callback_arg); |
538 | } else { | |
d166ed8c | 539 | if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, |
a230b26e | 540 | s->init_num + SSL3_HM_HEADER_LENGTH)) { |
d166ed8c DSH |
541 | SSLerr(SSL_F_TLS_GET_MESSAGE_BODY, ERR_R_EVP_LIB); |
542 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
543 | *len = 0; | |
544 | return 0; | |
545 | } | |
32ec4153 MC |
546 | if (s->msg_callback) |
547 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, | |
548 | (size_t)s->init_num + SSL3_HM_HEADER_LENGTH, s, | |
549 | s->msg_callback_arg); | |
550 | } | |
551 | ||
eda75751 | 552 | *len = s->init_num; |
9ab930b2 | 553 | return 1; |
0f113f3e | 554 | } |
d02b48c6 | 555 | |
2e5ead83 | 556 | int ssl_cert_type(const X509 *x, const EVP_PKEY *pk) |
0f113f3e | 557 | { |
a230b26e | 558 | if (pk == NULL && (pk = X509_get0_pubkey(x)) == NULL) |
17a72388 VD |
559 | return -1; |
560 | ||
561 | switch (EVP_PKEY_id(pk)) { | |
562 | default: | |
563 | return -1; | |
564 | case EVP_PKEY_RSA: | |
565 | return SSL_PKEY_RSA_ENC; | |
566 | case EVP_PKEY_DSA: | |
567 | return SSL_PKEY_DSA_SIGN; | |
ea262260 | 568 | #ifndef OPENSSL_NO_EC |
17a72388 VD |
569 | case EVP_PKEY_EC: |
570 | return SSL_PKEY_ECC; | |
ea262260 | 571 | #endif |
2a9b9654 | 572 | #ifndef OPENSSL_NO_GOST |
17a72388 VD |
573 | case NID_id_GostR3410_2001: |
574 | return SSL_PKEY_GOST01; | |
575 | case NID_id_GostR3410_2012_256: | |
576 | return SSL_PKEY_GOST12_256; | |
577 | case NID_id_GostR3410_2012_512: | |
578 | return SSL_PKEY_GOST12_512; | |
2a9b9654 | 579 | #endif |
82049c54 | 580 | } |
0f113f3e | 581 | } |
d02b48c6 | 582 | |
6b691a5c | 583 | int ssl_verify_alarm_type(long type) |
0f113f3e MC |
584 | { |
585 | int al; | |
586 | ||
587 | switch (type) { | |
588 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: | |
589 | case X509_V_ERR_UNABLE_TO_GET_CRL: | |
590 | case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: | |
591 | al = SSL_AD_UNKNOWN_CA; | |
592 | break; | |
593 | case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: | |
594 | case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: | |
595 | case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: | |
596 | case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: | |
597 | case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: | |
598 | case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: | |
599 | case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: | |
600 | case X509_V_ERR_CERT_NOT_YET_VALID: | |
601 | case X509_V_ERR_CRL_NOT_YET_VALID: | |
602 | case X509_V_ERR_CERT_UNTRUSTED: | |
603 | case X509_V_ERR_CERT_REJECTED: | |
f3e235ed VD |
604 | case X509_V_ERR_HOSTNAME_MISMATCH: |
605 | case X509_V_ERR_EMAIL_MISMATCH: | |
606 | case X509_V_ERR_IP_ADDRESS_MISMATCH: | |
607 | case X509_V_ERR_DANE_NO_MATCH: | |
608 | case X509_V_ERR_EE_KEY_TOO_SMALL: | |
609 | case X509_V_ERR_CA_KEY_TOO_SMALL: | |
610 | case X509_V_ERR_CA_MD_TOO_WEAK: | |
0f113f3e MC |
611 | al = SSL_AD_BAD_CERTIFICATE; |
612 | break; | |
613 | case X509_V_ERR_CERT_SIGNATURE_FAILURE: | |
614 | case X509_V_ERR_CRL_SIGNATURE_FAILURE: | |
615 | al = SSL_AD_DECRYPT_ERROR; | |
616 | break; | |
617 | case X509_V_ERR_CERT_HAS_EXPIRED: | |
618 | case X509_V_ERR_CRL_HAS_EXPIRED: | |
619 | al = SSL_AD_CERTIFICATE_EXPIRED; | |
620 | break; | |
621 | case X509_V_ERR_CERT_REVOKED: | |
622 | al = SSL_AD_CERTIFICATE_REVOKED; | |
623 | break; | |
f3e235ed | 624 | case X509_V_ERR_UNSPECIFIED: |
0f113f3e | 625 | case X509_V_ERR_OUT_OF_MEM: |
f3e235ed VD |
626 | case X509_V_ERR_INVALID_CALL: |
627 | case X509_V_ERR_STORE_LOOKUP: | |
0f113f3e MC |
628 | al = SSL_AD_INTERNAL_ERROR; |
629 | break; | |
630 | case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: | |
631 | case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: | |
632 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: | |
633 | case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: | |
634 | case X509_V_ERR_CERT_CHAIN_TOO_LONG: | |
635 | case X509_V_ERR_PATH_LENGTH_EXCEEDED: | |
636 | case X509_V_ERR_INVALID_CA: | |
637 | al = SSL_AD_UNKNOWN_CA; | |
638 | break; | |
639 | case X509_V_ERR_APPLICATION_VERIFICATION: | |
640 | al = SSL_AD_HANDSHAKE_FAILURE; | |
641 | break; | |
642 | case X509_V_ERR_INVALID_PURPOSE: | |
643 | al = SSL_AD_UNSUPPORTED_CERTIFICATE; | |
644 | break; | |
645 | default: | |
646 | al = SSL_AD_CERTIFICATE_UNKNOWN; | |
647 | break; | |
648 | } | |
649 | return (al); | |
650 | } | |
d02b48c6 | 651 | |
b362ccab | 652 | int ssl_allow_compression(SSL *s) |
0f113f3e MC |
653 | { |
654 | if (s->options & SSL_OP_NO_COMPRESSION) | |
655 | return 0; | |
656 | return ssl_security(s, SSL_SECOP_COMPRESSION, 0, 0, NULL); | |
657 | } | |
4fa52141 | 658 | |
068c358a | 659 | static int version_cmp(const SSL *s, int a, int b) |
4fa52141 VD |
660 | { |
661 | int dtls = SSL_IS_DTLS(s); | |
662 | ||
663 | if (a == b) | |
664 | return 0; | |
665 | if (!dtls) | |
666 | return a < b ? -1 : 1; | |
667 | return DTLS_VERSION_LT(a, b) ? -1 : 1; | |
668 | } | |
669 | ||
670 | typedef struct { | |
671 | int version; | |
a230b26e EK |
672 | const SSL_METHOD *(*cmeth) (void); |
673 | const SSL_METHOD *(*smeth) (void); | |
4fa52141 VD |
674 | } version_info; |
675 | ||
582a17d6 MC |
676 | #if TLS_MAX_VERSION != TLS1_3_VERSION |
677 | # error Code needs update for TLS_method() support beyond TLS1_3_VERSION. | |
4fa52141 VD |
678 | #endif |
679 | ||
680 | static const version_info tls_version_table[] = { | |
582a17d6 MC |
681 | #ifndef OPENSSL_NO_TLS1_3 |
682 | {TLS1_3_VERSION, tlsv1_3_client_method, tlsv1_3_server_method}, | |
683 | #else | |
684 | {TLS1_3_VERSION, NULL, NULL}, | |
685 | #endif | |
6b01bed2 | 686 | #ifndef OPENSSL_NO_TLS1_2 |
a230b26e | 687 | {TLS1_2_VERSION, tlsv1_2_client_method, tlsv1_2_server_method}, |
6b01bed2 | 688 | #else |
a230b26e | 689 | {TLS1_2_VERSION, NULL, NULL}, |
6b01bed2 VD |
690 | #endif |
691 | #ifndef OPENSSL_NO_TLS1_1 | |
a230b26e | 692 | {TLS1_1_VERSION, tlsv1_1_client_method, tlsv1_1_server_method}, |
6b01bed2 | 693 | #else |
a230b26e | 694 | {TLS1_1_VERSION, NULL, NULL}, |
6b01bed2 VD |
695 | #endif |
696 | #ifndef OPENSSL_NO_TLS1 | |
a230b26e | 697 | {TLS1_VERSION, tlsv1_client_method, tlsv1_server_method}, |
6b01bed2 | 698 | #else |
a230b26e | 699 | {TLS1_VERSION, NULL, NULL}, |
6b01bed2 | 700 | #endif |
4fa52141 | 701 | #ifndef OPENSSL_NO_SSL3 |
a230b26e | 702 | {SSL3_VERSION, sslv3_client_method, sslv3_server_method}, |
6b01bed2 | 703 | #else |
a230b26e | 704 | {SSL3_VERSION, NULL, NULL}, |
4fa52141 | 705 | #endif |
a230b26e | 706 | {0, NULL, NULL}, |
4fa52141 VD |
707 | }; |
708 | ||
709 | #if DTLS_MAX_VERSION != DTLS1_2_VERSION | |
710 | # error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION. | |
711 | #endif | |
712 | ||
713 | static const version_info dtls_version_table[] = { | |
6b01bed2 | 714 | #ifndef OPENSSL_NO_DTLS1_2 |
a230b26e | 715 | {DTLS1_2_VERSION, dtlsv1_2_client_method, dtlsv1_2_server_method}, |
6b01bed2 | 716 | #else |
a230b26e | 717 | {DTLS1_2_VERSION, NULL, NULL}, |
6b01bed2 VD |
718 | #endif |
719 | #ifndef OPENSSL_NO_DTLS1 | |
a230b26e EK |
720 | {DTLS1_VERSION, dtlsv1_client_method, dtlsv1_server_method}, |
721 | {DTLS1_BAD_VER, dtls_bad_ver_client_method, NULL}, | |
6b01bed2 | 722 | #else |
a230b26e EK |
723 | {DTLS1_VERSION, NULL, NULL}, |
724 | {DTLS1_BAD_VER, NULL, NULL}, | |
6b01bed2 | 725 | #endif |
a230b26e | 726 | {0, NULL, NULL}, |
4fa52141 VD |
727 | }; |
728 | ||
729 | /* | |
730 | * ssl_method_error - Check whether an SSL_METHOD is enabled. | |
731 | * | |
732 | * @s: The SSL handle for the candidate method | |
733 | * @method: the intended method. | |
734 | * | |
735 | * Returns 0 on success, or an SSL error reason on failure. | |
736 | */ | |
068c358a | 737 | static int ssl_method_error(const SSL *s, const SSL_METHOD *method) |
4fa52141 VD |
738 | { |
739 | int version = method->version; | |
740 | ||
741 | if ((s->min_proto_version != 0 && | |
742 | version_cmp(s, version, s->min_proto_version) < 0) || | |
743 | ssl_security(s, SSL_SECOP_VERSION, 0, version, NULL) == 0) | |
744 | return SSL_R_VERSION_TOO_LOW; | |
745 | ||
746 | if (s->max_proto_version != 0 && | |
a230b26e | 747 | version_cmp(s, version, s->max_proto_version) > 0) |
4fa52141 VD |
748 | return SSL_R_VERSION_TOO_HIGH; |
749 | ||
750 | if ((s->options & method->mask) != 0) | |
751 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
752 | if ((method->flags & SSL_METHOD_NO_SUITEB) != 0 && tls1_suiteb(s)) | |
753 | return SSL_R_AT_LEAST_TLS_1_2_NEEDED_IN_SUITEB_MODE; | |
754 | else if ((method->flags & SSL_METHOD_NO_FIPS) != 0 && FIPS_mode()) | |
755 | return SSL_R_AT_LEAST_TLS_1_0_NEEDED_IN_FIPS_MODE; | |
756 | ||
757 | return 0; | |
758 | } | |
759 | ||
ccae4a15 FI |
760 | /* |
761 | * ssl_version_supported - Check that the specified `version` is supported by | |
762 | * `SSL *` instance | |
763 | * | |
764 | * @s: The SSL handle for the candidate method | |
765 | * @version: Protocol version to test against | |
766 | * | |
767 | * Returns 1 when supported, otherwise 0 | |
768 | */ | |
769 | int ssl_version_supported(const SSL *s, int version) | |
770 | { | |
771 | const version_info *vent; | |
772 | const version_info *table; | |
773 | ||
774 | switch (s->method->version) { | |
775 | default: | |
776 | /* Version should match method version for non-ANY method */ | |
777 | return version_cmp(s, version, s->version) == 0; | |
778 | case TLS_ANY_VERSION: | |
779 | table = tls_version_table; | |
780 | break; | |
781 | case DTLS_ANY_VERSION: | |
782 | table = dtls_version_table; | |
783 | break; | |
784 | } | |
785 | ||
786 | for (vent = table; | |
787 | vent->version != 0 && version_cmp(s, version, vent->version) <= 0; | |
788 | ++vent) { | |
789 | if (vent->cmeth != NULL && | |
790 | version_cmp(s, version, vent->version) == 0 && | |
791 | ssl_method_error(s, vent->cmeth()) == 0) { | |
792 | return 1; | |
793 | } | |
794 | } | |
795 | return 0; | |
796 | } | |
797 | ||
4fa52141 VD |
798 | /* |
799 | * ssl_check_version_downgrade - In response to RFC7507 SCSV version | |
800 | * fallback indication from a client check whether we're using the highest | |
801 | * supported protocol version. | |
802 | * | |
803 | * @s server SSL handle. | |
804 | * | |
805 | * Returns 1 when using the highest enabled version, 0 otherwise. | |
806 | */ | |
807 | int ssl_check_version_downgrade(SSL *s) | |
808 | { | |
809 | const version_info *vent; | |
810 | const version_info *table; | |
811 | ||
812 | /* | |
813 | * Check that the current protocol is the highest enabled version | |
814 | * (according to s->ctx->method, as version negotiation may have changed | |
815 | * s->method). | |
816 | */ | |
817 | if (s->version == s->ctx->method->version) | |
818 | return 1; | |
819 | ||
820 | /* | |
821 | * Apparently we're using a version-flexible SSL_METHOD (not at its | |
822 | * highest protocol version). | |
823 | */ | |
824 | if (s->ctx->method->version == TLS_method()->version) | |
825 | table = tls_version_table; | |
826 | else if (s->ctx->method->version == DTLS_method()->version) | |
827 | table = dtls_version_table; | |
828 | else { | |
829 | /* Unexpected state; fail closed. */ | |
830 | return 0; | |
831 | } | |
832 | ||
833 | for (vent = table; vent->version != 0; ++vent) { | |
a230b26e | 834 | if (vent->smeth != NULL && ssl_method_error(s, vent->smeth()) == 0) |
4fa52141 VD |
835 | return s->version == vent->version; |
836 | } | |
837 | return 0; | |
838 | } | |
839 | ||
840 | /* | |
841 | * ssl_set_version_bound - set an upper or lower bound on the supported (D)TLS | |
842 | * protocols, provided the initial (D)TLS method is version-flexible. This | |
843 | * function sanity-checks the proposed value and makes sure the method is | |
844 | * version-flexible, then sets the limit if all is well. | |
845 | * | |
846 | * @method_version: The version of the current SSL_METHOD. | |
847 | * @version: the intended limit. | |
848 | * @bound: pointer to limit to be updated. | |
849 | * | |
850 | * Returns 1 on success, 0 on failure. | |
851 | */ | |
852 | int ssl_set_version_bound(int method_version, int version, int *bound) | |
853 | { | |
869e978c KR |
854 | if (version == 0) { |
855 | *bound = version; | |
856 | return 1; | |
857 | } | |
858 | ||
4fa52141 VD |
859 | /*- |
860 | * Restrict TLS methods to TLS protocol versions. | |
861 | * Restrict DTLS methods to DTLS protocol versions. | |
862 | * Note, DTLS version numbers are decreasing, use comparison macros. | |
863 | * | |
864 | * Note that for both lower-bounds we use explicit versions, not | |
865 | * (D)TLS_MIN_VERSION. This is because we don't want to break user | |
866 | * configurations. If the MIN (supported) version ever rises, the user's | |
867 | * "floor" remains valid even if no longer available. We don't expect the | |
868 | * MAX ceiling to ever get lower, so making that variable makes sense. | |
869 | */ | |
870 | switch (method_version) { | |
871 | default: | |
872 | /* | |
873 | * XXX For fixed version methods, should we always fail and not set any | |
874 | * bounds, always succeed and not set any bounds, or set the bounds and | |
875 | * arrange to fail later if they are not met? At present fixed-version | |
876 | * methods are not subject to controls that disable individual protocol | |
877 | * versions. | |
878 | */ | |
879 | return 0; | |
880 | ||
881 | case TLS_ANY_VERSION: | |
882 | if (version < SSL3_VERSION || version > TLS_MAX_VERSION) | |
883 | return 0; | |
884 | break; | |
885 | ||
886 | case DTLS_ANY_VERSION: | |
887 | if (DTLS_VERSION_GT(version, DTLS_MAX_VERSION) || | |
032924c4 | 888 | DTLS_VERSION_LT(version, DTLS1_BAD_VER)) |
4fa52141 VD |
889 | return 0; |
890 | break; | |
891 | } | |
892 | ||
893 | *bound = version; | |
894 | return 1; | |
895 | } | |
896 | ||
897 | /* | |
898 | * ssl_choose_server_version - Choose server (D)TLS version. Called when the | |
899 | * client HELLO is received to select the final server protocol version and | |
900 | * the version specific method. | |
901 | * | |
902 | * @s: server SSL handle. | |
903 | * | |
904 | * Returns 0 on success or an SSL error reason number on failure. | |
905 | */ | |
1ab3836b | 906 | int ssl_choose_server_version(SSL *s, CLIENTHELLO_MSG *hello) |
4fa52141 VD |
907 | { |
908 | /*- | |
909 | * With version-flexible methods we have an initial state with: | |
910 | * | |
911 | * s->method->version == (D)TLS_ANY_VERSION, | |
912 | * s->version == (D)TLS_MAX_VERSION. | |
913 | * | |
914 | * So we detect version-flexible methods via the method version, not the | |
915 | * handle version. | |
916 | */ | |
917 | int server_version = s->method->version; | |
df7ce507 | 918 | int client_version = hello->legacy_version; |
4fa52141 VD |
919 | const version_info *vent; |
920 | const version_info *table; | |
921 | int disabled = 0; | |
cd998837 | 922 | RAW_EXTENSION *suppversions; |
4fa52141 | 923 | |
1ab3836b MC |
924 | s->client_version = client_version; |
925 | ||
4fa52141 VD |
926 | switch (server_version) { |
927 | default: | |
d2f42576 MC |
928 | /* |
929 | * TODO(TLS1.3): This check will fail if someone attempts to do | |
930 | * renegotiation in TLS1.3 at the moment. We need to ensure we disable | |
931 | * renegotiation for TLS1.3 | |
932 | */ | |
4fa52141 VD |
933 | if (version_cmp(s, client_version, s->version) < 0) |
934 | return SSL_R_WRONG_SSL_VERSION; | |
935 | /* | |
936 | * If this SSL handle is not from a version flexible method we don't | |
937 | * (and never did) check min/max FIPS or Suite B constraints. Hope | |
938 | * that's OK. It is up to the caller to not choose fixed protocol | |
939 | * versions they don't want. If not, then easy to fix, just return | |
940 | * ssl_method_error(s, s->method) | |
941 | */ | |
942 | return 0; | |
943 | case TLS_ANY_VERSION: | |
944 | table = tls_version_table; | |
945 | break; | |
946 | case DTLS_ANY_VERSION: | |
947 | table = dtls_version_table; | |
948 | break; | |
949 | } | |
950 | ||
cd998837 MC |
951 | suppversions = tls_get_extension_by_type(hello->pre_proc_exts, |
952 | hello->num_extensions, | |
953 | TLSEXT_TYPE_supported_versions); | |
954 | ||
7b21c00e | 955 | if (suppversions != NULL && !SSL_IS_DTLS(s)) { |
cd998837 MC |
956 | unsigned int candidate_vers = 0; |
957 | unsigned int best_vers = 0; | |
958 | const SSL_METHOD *best_method = NULL; | |
959 | PACKET versionslist; | |
960 | ||
6b473aca MC |
961 | suppversions->parsed = 1; |
962 | ||
16bce0e0 | 963 | if (!PACKET_as_length_prefixed_1(&suppversions->data, &versionslist)) { |
cd998837 MC |
964 | /* Trailing or invalid data? */ |
965 | return SSL_R_LENGTH_MISMATCH; | |
966 | } | |
967 | ||
968 | while (PACKET_get_net_2(&versionslist, &candidate_vers)) { | |
969 | /* TODO(TLS1.3): Remove this before release */ | |
970 | if (candidate_vers == TLS1_3_VERSION_DRAFT) | |
971 | candidate_vers = TLS1_3_VERSION; | |
f2342b7a MC |
972 | /* |
973 | * TODO(TLS1.3): There is some discussion on the TLS list about | |
974 | * wheter to ignore versions <TLS1.2 in supported_versions. At the | |
975 | * moment we honour them if present. To be reviewed later | |
976 | */ | |
cd998837 MC |
977 | if (version_cmp(s, candidate_vers, best_vers) <= 0) |
978 | continue; | |
979 | for (vent = table; | |
980 | vent->version != 0 && vent->version != (int)candidate_vers; | |
16bce0e0 | 981 | ++vent) |
bf0ba5e7 | 982 | continue; |
bf85ef1b | 983 | if (vent->version != 0 && vent->smeth != NULL) { |
cd998837 MC |
984 | const SSL_METHOD *method; |
985 | ||
986 | method = vent->smeth(); | |
987 | if (ssl_method_error(s, method) == 0) { | |
988 | best_vers = candidate_vers; | |
989 | best_method = method; | |
990 | } | |
991 | } | |
992 | } | |
993 | if (PACKET_remaining(&versionslist) != 0) { | |
994 | /* Trailing data? */ | |
995 | return SSL_R_LENGTH_MISMATCH; | |
996 | } | |
997 | ||
998 | if (best_vers > 0) { | |
999 | s->version = best_vers; | |
1000 | s->method = best_method; | |
1001 | return 0; | |
1002 | } | |
1003 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * If the supported versions extension isn't present, then the highest | |
1008 | * version we can negotiate is TLSv1.2 | |
1009 | */ | |
1010 | if (version_cmp(s, client_version, TLS1_3_VERSION) >= 0) | |
1011 | client_version = TLS1_2_VERSION; | |
1012 | ||
1013 | /* | |
1014 | * No supported versions extension, so we just use the version supplied in | |
1015 | * the ClientHello. | |
1016 | */ | |
4fa52141 VD |
1017 | for (vent = table; vent->version != 0; ++vent) { |
1018 | const SSL_METHOD *method; | |
1019 | ||
1020 | if (vent->smeth == NULL || | |
1021 | version_cmp(s, client_version, vent->version) < 0) | |
1022 | continue; | |
1023 | method = vent->smeth(); | |
1024 | if (ssl_method_error(s, method) == 0) { | |
1025 | s->version = vent->version; | |
1026 | s->method = method; | |
1027 | return 0; | |
1028 | } | |
1029 | disabled = 1; | |
1030 | } | |
1031 | return disabled ? SSL_R_UNSUPPORTED_PROTOCOL : SSL_R_VERSION_TOO_LOW; | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * ssl_choose_client_version - Choose client (D)TLS version. Called when the | |
1036 | * server HELLO is received to select the final client protocol version and | |
1037 | * the version specific method. | |
1038 | * | |
1039 | * @s: client SSL handle. | |
1040 | * @version: The proposed version from the server's HELLO. | |
1041 | * | |
1042 | * Returns 0 on success or an SSL error reason number on failure. | |
1043 | */ | |
1044 | int ssl_choose_client_version(SSL *s, int version) | |
1045 | { | |
1046 | const version_info *vent; | |
1047 | const version_info *table; | |
1048 | ||
b97667ce MC |
1049 | /* TODO(TLS1.3): Remove this before release */ |
1050 | if (version == TLS1_3_VERSION_DRAFT) | |
1051 | version = TLS1_3_VERSION; | |
1052 | ||
4fa52141 VD |
1053 | switch (s->method->version) { |
1054 | default: | |
1055 | if (version != s->version) | |
1056 | return SSL_R_WRONG_SSL_VERSION; | |
1057 | /* | |
1058 | * If this SSL handle is not from a version flexible method we don't | |
1059 | * (and never did) check min/max, FIPS or Suite B constraints. Hope | |
1060 | * that's OK. It is up to the caller to not choose fixed protocol | |
1061 | * versions they don't want. If not, then easy to fix, just return | |
1062 | * ssl_method_error(s, s->method) | |
1063 | */ | |
4fa52141 VD |
1064 | return 0; |
1065 | case TLS_ANY_VERSION: | |
1066 | table = tls_version_table; | |
1067 | break; | |
1068 | case DTLS_ANY_VERSION: | |
1069 | table = dtls_version_table; | |
1070 | break; | |
1071 | } | |
1072 | ||
1073 | for (vent = table; vent->version != 0; ++vent) { | |
1074 | const SSL_METHOD *method; | |
1075 | int err; | |
1076 | ||
1077 | if (version != vent->version) | |
1078 | continue; | |
1079 | if (vent->cmeth == NULL) | |
1080 | break; | |
1081 | method = vent->cmeth(); | |
1082 | err = ssl_method_error(s, method); | |
1083 | if (err != 0) | |
1084 | return err; | |
1085 | s->method = method; | |
ccae4a15 | 1086 | s->version = version; |
4fa52141 VD |
1087 | return 0; |
1088 | } | |
1089 | ||
1090 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
1091 | } | |
1092 | ||
068c358a KR |
1093 | /* |
1094 | * ssl_get_client_min_max_version - get minimum and maximum client version | |
1095 | * @s: The SSL connection | |
1096 | * @min_version: The minimum supported version | |
1097 | * @max_version: The maximum supported version | |
1098 | * | |
1099 | * Work out what version we should be using for the initial ClientHello if the | |
1100 | * version is initially (D)TLS_ANY_VERSION. We apply any explicit SSL_OP_NO_xxx | |
1101 | * options, the MinProtocol and MaxProtocol configuration commands, any Suite B | |
1102 | * or FIPS_mode() constraints and any floor imposed by the security level here, | |
1103 | * so we don't advertise the wrong protocol version to only reject the outcome later. | |
4fa52141 | 1104 | * |
0485d540 | 1105 | * Computing the right floor matters. If, e.g., TLS 1.0 and 1.2 are enabled, |
4fa52141 VD |
1106 | * TLS 1.1 is disabled, but the security level, Suite-B and/or MinProtocol |
1107 | * only allow TLS 1.2, we want to advertise TLS1.2, *not* TLS1. | |
1108 | * | |
068c358a KR |
1109 | * Returns 0 on success or an SSL error reason number on failure. On failure |
1110 | * min_version and max_version will also be set to 0. | |
4fa52141 | 1111 | */ |
a230b26e EK |
1112 | int ssl_get_client_min_max_version(const SSL *s, int *min_version, |
1113 | int *max_version) | |
4fa52141 VD |
1114 | { |
1115 | int version; | |
1116 | int hole; | |
1117 | const SSL_METHOD *single = NULL; | |
1118 | const SSL_METHOD *method; | |
1119 | const version_info *table; | |
1120 | const version_info *vent; | |
1121 | ||
1122 | switch (s->method->version) { | |
1123 | default: | |
1124 | /* | |
1125 | * If this SSL handle is not from a version flexible method we don't | |
1126 | * (and never did) check min/max FIPS or Suite B constraints. Hope | |
1127 | * that's OK. It is up to the caller to not choose fixed protocol | |
1128 | * versions they don't want. If not, then easy to fix, just return | |
1129 | * ssl_method_error(s, s->method) | |
1130 | */ | |
068c358a | 1131 | *min_version = *max_version = s->version; |
4fa52141 VD |
1132 | return 0; |
1133 | case TLS_ANY_VERSION: | |
1134 | table = tls_version_table; | |
1135 | break; | |
1136 | case DTLS_ANY_VERSION: | |
1137 | table = dtls_version_table; | |
1138 | break; | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * SSL_OP_NO_X disables all protocols above X *if* there are some protocols | |
1143 | * below X enabled. This is required in order to maintain the "version | |
1144 | * capability" vector contiguous. Any versions with a NULL client method | |
1145 | * (protocol version client is disabled at compile-time) is also a "hole". | |
1146 | * | |
1147 | * Our initial state is hole == 1, version == 0. That is, versions above | |
1148 | * the first version in the method table are disabled (a "hole" above | |
1149 | * the valid protocol entries) and we don't have a selected version yet. | |
1150 | * | |
1151 | * Whenever "hole == 1", and we hit an enabled method, its version becomes | |
1152 | * the selected version, and the method becomes a candidate "single" | |
1153 | * method. We're no longer in a hole, so "hole" becomes 0. | |
1154 | * | |
1155 | * If "hole == 0" and we hit an enabled method, then "single" is cleared, | |
1156 | * as we support a contiguous range of at least two methods. If we hit | |
1157 | * a disabled method, then hole becomes true again, but nothing else | |
1158 | * changes yet, because all the remaining methods may be disabled too. | |
1159 | * If we again hit an enabled method after the new hole, it becomes | |
1160 | * selected, as we start from scratch. | |
1161 | */ | |
068c358a | 1162 | *min_version = version = 0; |
4fa52141 VD |
1163 | hole = 1; |
1164 | for (vent = table; vent->version != 0; ++vent) { | |
1165 | /* | |
1166 | * A table entry with a NULL client method is still a hole in the | |
1167 | * "version capability" vector. | |
1168 | */ | |
1169 | if (vent->cmeth == NULL) { | |
1170 | hole = 1; | |
1171 | continue; | |
1172 | } | |
1173 | method = vent->cmeth(); | |
1174 | if (ssl_method_error(s, method) != 0) { | |
1175 | hole = 1; | |
1176 | } else if (!hole) { | |
1177 | single = NULL; | |
068c358a | 1178 | *min_version = method->version; |
4fa52141 VD |
1179 | } else { |
1180 | version = (single = method)->version; | |
068c358a | 1181 | *min_version = version; |
4fa52141 VD |
1182 | hole = 0; |
1183 | } | |
1184 | } | |
1185 | ||
068c358a KR |
1186 | *max_version = version; |
1187 | ||
4fa52141 VD |
1188 | /* Fail if everything is disabled */ |
1189 | if (version == 0) | |
1190 | return SSL_R_NO_PROTOCOLS_AVAILABLE; | |
1191 | ||
068c358a KR |
1192 | return 0; |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * ssl_set_client_hello_version - Work out what version we should be using for | |
7acb8b64 | 1197 | * the initial ClientHello.legacy_version field. |
068c358a KR |
1198 | * |
1199 | * @s: client SSL handle. | |
1200 | * | |
1201 | * Returns 0 on success or an SSL error reason number on failure. | |
1202 | */ | |
1203 | int ssl_set_client_hello_version(SSL *s) | |
1204 | { | |
3eb2aff4 | 1205 | int ver_min, ver_max, ret; |
068c358a | 1206 | |
3eb2aff4 | 1207 | ret = ssl_get_client_min_max_version(s, &ver_min, &ver_max); |
068c358a KR |
1208 | |
1209 | if (ret != 0) | |
1210 | return ret; | |
1211 | ||
7acb8b64 MC |
1212 | s->version = ver_max; |
1213 | ||
1214 | /* TLS1.3 always uses TLS1.2 in the legacy_version field */ | |
1215 | if (!SSL_IS_DTLS(s) && ver_max > TLS1_2_VERSION) | |
1216 | ver_max = TLS1_2_VERSION; | |
1217 | ||
1218 | s->client_version = ver_max; | |
4fa52141 VD |
1219 | return 0; |
1220 | } |