]>
Commit | Line | Data |
---|---|---|
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 | { |
0f113f3e | 77 | int i; |
229185e6 MC |
78 | const char *sender; |
79 | int slen; | |
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 | |
b9908bf9 MC |
89 | i = s->method->ssl3_enc->final_finish_mac(s, |
90 | sender, slen, | |
91 | s->s3->tmp.finish_md); | |
4f89bfbf MC |
92 | if (i <= 0) { |
93 | SSLerr(SSL_F_TLS_CONSTRUCT_FINISHED, ERR_R_INTERNAL_ERROR); | |
94 | goto err; | |
95 | } | |
96 | ||
b9908bf9 | 97 | s->s3->tmp.finish_md_len = i; |
4f89bfbf | 98 | |
7cea05dc | 99 | if (!WPACKET_memcpy(pkt, s->s3->tmp.finish_md, i)) { |
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) { |
b9908bf9 MC |
108 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); |
109 | memcpy(s->s3->previous_client_finished, s->s3->tmp.finish_md, i); | |
110 | s->s3->previous_client_finished_len = i; | |
111 | } else { | |
112 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); | |
113 | memcpy(s->s3->previous_server_finished, s->s3->tmp.finish_md, i); | |
114 | s->s3->previous_server_finished_len = i; | |
115 | } | |
0f113f3e | 116 | |
b9908bf9 | 117 | return 1; |
4f89bfbf | 118 | err: |
4f89bfbf MC |
119 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
120 | return 0; | |
0f113f3e | 121 | } |
d02b48c6 | 122 | |
bf48836c | 123 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
124 | /* |
125 | * ssl3_take_mac calculates the Finished MAC for the handshakes messages seen | |
126 | * to far. | |
127 | */ | |
ee2ffc27 | 128 | static void ssl3_take_mac(SSL *s) |
0f113f3e MC |
129 | { |
130 | const char *sender; | |
131 | int slen; | |
132 | /* | |
133 | * If no new cipher setup return immediately: other functions will set | |
134 | * the appropriate error. | |
135 | */ | |
136 | if (s->s3->tmp.new_cipher == NULL) | |
137 | return; | |
49ae7423 | 138 | if (!s->server) { |
0f113f3e MC |
139 | sender = s->method->ssl3_enc->server_finished_label; |
140 | slen = s->method->ssl3_enc->server_finished_label_len; | |
141 | } else { | |
142 | sender = s->method->ssl3_enc->client_finished_label; | |
143 | slen = s->method->ssl3_enc->client_finished_label_len; | |
144 | } | |
145 | ||
146 | s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s, | |
147 | sender, | |
148 | slen, | |
149 | s->s3->tmp.peer_finish_md); | |
150 | } | |
ee2ffc27 BL |
151 | #endif |
152 | ||
be3583fa | 153 | MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt) |
b9908bf9 MC |
154 | { |
155 | int al; | |
73999b62 | 156 | long remain; |
4fa52141 | 157 | |
73999b62 | 158 | remain = PACKET_remaining(pkt); |
657da85e MC |
159 | /* |
160 | * 'Change Cipher Spec' is just a single byte, which should already have | |
c69f2adf MC |
161 | * been consumed by ssl_get_message() so there should be no bytes left, |
162 | * unless we're using DTLS1_BAD_VER, which has an extra 2 bytes | |
657da85e | 163 | */ |
c69f2adf | 164 | if (SSL_IS_DTLS(s)) { |
73999b62 | 165 | if ((s->version == DTLS1_BAD_VER |
a230b26e EK |
166 | && remain != DTLS1_CCS_HEADER_LENGTH + 1) |
167 | || (s->version != DTLS1_BAD_VER | |
168 | && remain != DTLS1_CCS_HEADER_LENGTH - 1)) { | |
169 | al = SSL_AD_ILLEGAL_PARAMETER; | |
170 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, | |
171 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
172 | goto f_err; | |
c69f2adf MC |
173 | } |
174 | } else { | |
73999b62 | 175 | if (remain != 0) { |
c69f2adf | 176 | al = SSL_AD_ILLEGAL_PARAMETER; |
b9908bf9 MC |
177 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, |
178 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
c69f2adf MC |
179 | goto f_err; |
180 | } | |
657da85e MC |
181 | } |
182 | ||
183 | /* Check we have a cipher to change to */ | |
184 | if (s->s3->tmp.new_cipher == NULL) { | |
185 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
b9908bf9 | 186 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, SSL_R_CCS_RECEIVED_EARLY); |
657da85e MC |
187 | goto f_err; |
188 | } | |
189 | ||
190 | s->s3->change_cipher_spec = 1; | |
191 | if (!ssl3_do_change_cipher_spec(s)) { | |
192 | al = SSL_AD_INTERNAL_ERROR; | |
b9908bf9 | 193 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); |
657da85e MC |
194 | goto f_err; |
195 | } | |
196 | ||
c69f2adf MC |
197 | if (SSL_IS_DTLS(s)) { |
198 | dtls1_reset_seq_numbers(s, SSL3_CC_READ); | |
199 | ||
200 | if (s->version == DTLS1_BAD_VER) | |
201 | s->d1->handshake_read_seq++; | |
202 | ||
203 | #ifndef OPENSSL_NO_SCTP | |
204 | /* | |
205 | * Remember that a CCS has been received, so that an old key of | |
206 | * SCTP-Auth can be deleted when a CCS is sent. Will be ignored if no | |
207 | * SCTP is used | |
208 | */ | |
209 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL); | |
210 | #endif | |
211 | } | |
212 | ||
b9908bf9 | 213 | return MSG_PROCESS_CONTINUE_READING; |
657da85e MC |
214 | f_err: |
215 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 216 | ossl_statem_set_error(s); |
b9908bf9 | 217 | return MSG_PROCESS_ERROR; |
657da85e MC |
218 | } |
219 | ||
be3583fa | 220 | MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt) |
b9908bf9 MC |
221 | { |
222 | int al, i; | |
b9908bf9 | 223 | |
0f113f3e MC |
224 | /* If this occurs, we have missed a message */ |
225 | if (!s->s3->change_cipher_spec) { | |
226 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
b9908bf9 | 227 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_GOT_A_FIN_BEFORE_A_CCS); |
0f113f3e MC |
228 | goto f_err; |
229 | } | |
230 | s->s3->change_cipher_spec = 0; | |
231 | ||
0f113f3e MC |
232 | i = s->s3->tmp.peer_finish_md_len; |
233 | ||
956de7b2 | 234 | if ((unsigned long)i != PACKET_remaining(pkt)) { |
0f113f3e | 235 | al = SSL_AD_DECODE_ERROR; |
b9908bf9 | 236 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_BAD_DIGEST_LENGTH); |
0f113f3e MC |
237 | goto f_err; |
238 | } | |
239 | ||
73999b62 | 240 | if (CRYPTO_memcmp(PACKET_data(pkt), s->s3->tmp.peer_finish_md, i) != 0) { |
0f113f3e | 241 | al = SSL_AD_DECRYPT_ERROR; |
b9908bf9 | 242 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_DIGEST_CHECK_FAILED); |
0f113f3e MC |
243 | goto f_err; |
244 | } | |
245 | ||
246 | /* | |
247 | * Copy the finished so we can use it for renegotiation checks | |
248 | */ | |
23a635c0 | 249 | if (s->server) { |
0f113f3e MC |
250 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); |
251 | memcpy(s->s3->previous_client_finished, s->s3->tmp.peer_finish_md, i); | |
252 | s->s3->previous_client_finished_len = i; | |
253 | } else { | |
254 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); | |
255 | memcpy(s->s3->previous_server_finished, s->s3->tmp.peer_finish_md, i); | |
256 | s->s3->previous_server_finished_len = i; | |
257 | } | |
258 | ||
e6575156 | 259 | return MSG_PROCESS_FINISHED_READING; |
0f113f3e MC |
260 | f_err: |
261 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 262 | ossl_statem_set_error(s); |
b9908bf9 | 263 | return MSG_PROCESS_ERROR; |
0f113f3e | 264 | } |
d02b48c6 | 265 | |
7cea05dc | 266 | int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt) |
b9908bf9 | 267 | { |
7cea05dc | 268 | if (!WPACKET_put_bytes_u8(pkt, SSL3_MT_CCS)) { |
3c106325 | 269 | SSLerr(SSL_F_TLS_CONSTRUCT_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); |
85a7a5e6 MC |
270 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
271 | return 0; | |
272 | } | |
b9908bf9 | 273 | |
b9908bf9 MC |
274 | return 1; |
275 | } | |
276 | ||
7cea05dc | 277 | unsigned long ssl3_output_cert_chain(SSL *s, WPACKET *pkt, CERT_PKEY *cpk) |
0f113f3e | 278 | { |
5923ad4b | 279 | if (!WPACKET_start_sub_packet_u24(pkt) |
7cea05dc | 280 | || !ssl_add_cert_chain(s, pkt, cpk) |
5923ad4b | 281 | || !WPACKET_close(pkt)) { |
c49e1912 | 282 | SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN, ERR_R_INTERNAL_ERROR); |
7cea05dc | 283 | return 0; |
77d514c5 | 284 | } |
c49e1912 | 285 | return 1; |
0f113f3e MC |
286 | } |
287 | ||
be3583fa | 288 | WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst) |
8723588e MC |
289 | { |
290 | void (*cb) (const SSL *ssl, int type, int val) = NULL; | |
291 | ||
292 | #ifndef OPENSSL_NO_SCTP | |
293 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) { | |
be3583fa | 294 | WORK_STATE ret; |
8723588e MC |
295 | ret = dtls_wait_for_dry(s); |
296 | if (ret != WORK_FINISHED_CONTINUE) | |
297 | return ret; | |
298 | } | |
299 | #endif | |
300 | ||
301 | /* clean a few things up */ | |
302 | ssl3_cleanup_key_block(s); | |
473483d4 MC |
303 | |
304 | if (!SSL_IS_DTLS(s)) { | |
305 | /* | |
306 | * We don't do this in DTLS because we may still need the init_buf | |
307 | * in case there are any unexpected retransmits | |
308 | */ | |
309 | BUF_MEM_free(s->init_buf); | |
310 | s->init_buf = NULL; | |
311 | } | |
8723588e MC |
312 | |
313 | ssl_free_wbio_buffer(s); | |
314 | ||
315 | s->init_num = 0; | |
316 | ||
317 | if (!s->server || s->renegotiate == 2) { | |
318 | /* skipped if we just sent a HelloRequest */ | |
319 | s->renegotiate = 0; | |
320 | s->new_session = 0; | |
321 | ||
322 | if (s->server) { | |
8723588e MC |
323 | ssl_update_cache(s, SSL_SESS_CACHE_SERVER); |
324 | ||
325 | s->ctx->stats.sess_accept_good++; | |
fe3a3291 | 326 | s->handshake_func = ossl_statem_accept; |
8723588e MC |
327 | } else { |
328 | ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); | |
329 | if (s->hit) | |
330 | s->ctx->stats.sess_hit++; | |
331 | ||
fe3a3291 | 332 | s->handshake_func = ossl_statem_connect; |
8723588e MC |
333 | s->ctx->stats.sess_connect_good++; |
334 | } | |
335 | ||
336 | if (s->info_callback != NULL) | |
337 | cb = s->info_callback; | |
338 | else if (s->ctx->info_callback != NULL) | |
339 | cb = s->ctx->info_callback; | |
340 | ||
341 | if (cb != NULL) | |
342 | cb(s, SSL_CB_HANDSHAKE_DONE, 1); | |
343 | ||
344 | if (SSL_IS_DTLS(s)) { | |
345 | /* done with handshaking */ | |
346 | s->d1->handshake_read_seq = 0; | |
347 | s->d1->handshake_write_seq = 0; | |
348 | s->d1->next_handshake_write_seq = 0; | |
f5c7f5df | 349 | dtls1_clear_received_buffer(s); |
8723588e MC |
350 | } |
351 | } | |
352 | ||
353 | return WORK_FINISHED_STOP; | |
354 | } | |
355 | ||
9ab930b2 MC |
356 | int tls_get_message_header(SSL *s, int *mt) |
357 | { | |
358 | /* s->init_num < SSL3_HM_HEADER_LENGTH */ | |
359 | int skip_message, i, recvd_type, al; | |
360 | unsigned char *p; | |
eda75751 | 361 | size_t l, read; |
9ab930b2 MC |
362 | |
363 | p = (unsigned char *)s->init_buf->data; | |
364 | ||
365 | do { | |
366 | while (s->init_num < SSL3_HM_HEADER_LENGTH) { | |
367 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &recvd_type, | |
a230b26e EK |
368 | &p[s->init_num], |
369 | SSL3_HM_HEADER_LENGTH - s->init_num, | |
eda75751 | 370 | 0, &read); |
9ab930b2 MC |
371 | if (i <= 0) { |
372 | s->rwstate = SSL_READING; | |
373 | return 0; | |
32ec4153 | 374 | } |
9ab930b2 | 375 | if (recvd_type == SSL3_RT_CHANGE_CIPHER_SPEC) { |
1257adec | 376 | /* |
a230b26e EK |
377 | * A ChangeCipherSpec must be a single byte and may not occur |
378 | * in the middle of a handshake message. | |
379 | */ | |
eda75751 | 380 | if (s->init_num != 0 || read != 1 || p[0] != SSL3_MT_CCS) { |
1257adec DB |
381 | al = SSL_AD_UNEXPECTED_MESSAGE; |
382 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, | |
383 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
384 | goto f_err; | |
385 | } | |
9ab930b2 | 386 | s->s3->tmp.message_type = *mt = SSL3_MT_CHANGE_CIPHER_SPEC; |
eda75751 MC |
387 | s->init_num = read - 1; |
388 | s->s3->tmp.message_size = read; | |
9ab930b2 MC |
389 | return 1; |
390 | } else if (recvd_type != SSL3_RT_HANDSHAKE) { | |
391 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
392 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_CCS_RECEIVED_EARLY); | |
32ec4153 MC |
393 | goto f_err; |
394 | } | |
eda75751 | 395 | s->init_num += read; |
9ab930b2 MC |
396 | } |
397 | ||
398 | skip_message = 0; | |
399 | if (!s->server) | |
400 | if (p[0] == SSL3_MT_HELLO_REQUEST) | |
401 | /* | |
402 | * The server may always send 'Hello Request' messages -- | |
403 | * we are doing a handshake anyway now, so ignore them if | |
404 | * their format is correct. Does not count for 'Finished' | |
405 | * MAC. | |
406 | */ | |
407 | if (p[1] == 0 && p[2] == 0 && p[3] == 0) { | |
408 | s->init_num = 0; | |
409 | skip_message = 1; | |
410 | ||
411 | if (s->msg_callback) | |
412 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
413 | p, SSL3_HM_HEADER_LENGTH, s, | |
414 | s->msg_callback_arg); | |
415 | } | |
416 | } while (skip_message); | |
417 | /* s->init_num == SSL3_HM_HEADER_LENGTH */ | |
418 | ||
419 | *mt = *p; | |
420 | s->s3->tmp.message_type = *(p++); | |
32ec4153 | 421 | |
e8aa8b6c | 422 | if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { |
9ab930b2 MC |
423 | /* |
424 | * Only happens with SSLv3+ in an SSLv2 backward compatible | |
425 | * ClientHello | |
e8aa8b6c F |
426 | * |
427 | * Total message size is the remaining record bytes to read | |
428 | * plus the SSL3_HM_HEADER_LENGTH bytes that we already read | |
9ab930b2 | 429 | */ |
9ab930b2 MC |
430 | l = RECORD_LAYER_get_rrec_length(&s->rlayer) |
431 | + SSL3_HM_HEADER_LENGTH; | |
9ab930b2 MC |
432 | s->s3->tmp.message_size = l; |
433 | ||
434 | s->init_msg = s->init_buf->data; | |
435 | s->init_num = SSL3_HM_HEADER_LENGTH; | |
436 | } else { | |
437 | n2l3(p, l); | |
438 | /* BUF_MEM_grow takes an 'int' parameter */ | |
439 | if (l > (INT_MAX - SSL3_HM_HEADER_LENGTH)) { | |
440 | al = SSL_AD_ILLEGAL_PARAMETER; | |
441 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
442 | goto f_err; | |
32ec4153 | 443 | } |
9ab930b2 MC |
444 | s->s3->tmp.message_size = l; |
445 | ||
446 | s->init_msg = s->init_buf->data + SSL3_HM_HEADER_LENGTH; | |
447 | s->init_num = 0; | |
448 | } | |
449 | ||
450 | return 1; | |
451 | f_err: | |
452 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
9ab930b2 MC |
453 | return 0; |
454 | } | |
455 | ||
eda75751 | 456 | int tls_get_message_body(SSL *s, size_t *len) |
9ab930b2 | 457 | { |
eda75751 | 458 | size_t n, read; |
9ab930b2 MC |
459 | unsigned char *p; |
460 | int i; | |
461 | ||
462 | if (s->s3->tmp.message_type == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
463 | /* We've already read everything in */ | |
464 | *len = (unsigned long)s->init_num; | |
465 | return 1; | |
0f113f3e MC |
466 | } |
467 | ||
0f113f3e MC |
468 | p = s->init_msg; |
469 | n = s->s3->tmp.message_size - s->init_num; | |
470 | while (n > 0) { | |
657da85e | 471 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL, |
eda75751 | 472 | &p[s->init_num], n, 0, &read); |
0f113f3e MC |
473 | if (i <= 0) { |
474 | s->rwstate = SSL_READING; | |
9ab930b2 MC |
475 | *len = 0; |
476 | return 0; | |
0f113f3e | 477 | } |
eda75751 MC |
478 | s->init_num += read; |
479 | n -= read; | |
0f113f3e | 480 | } |
ee2ffc27 | 481 | |
bf48836c | 482 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
483 | /* |
484 | * If receiving Finished, record MAC of prior handshake messages for | |
485 | * Finished verification. | |
486 | */ | |
487 | if (*s->init_buf->data == SSL3_MT_FINISHED) | |
488 | ssl3_take_mac(s); | |
ee2ffc27 BL |
489 | #endif |
490 | ||
0f113f3e | 491 | /* Feed this message into MAC computation. */ |
e8aa8b6c | 492 | if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { |
d166ed8c DSH |
493 | if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, |
494 | s->init_num)) { | |
495 | SSLerr(SSL_F_TLS_GET_MESSAGE_BODY, ERR_R_EVP_LIB); | |
496 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
497 | *len = 0; | |
498 | return 0; | |
499 | } | |
32ec4153 | 500 | if (s->msg_callback) |
a230b26e | 501 | s->msg_callback(0, SSL2_VERSION, 0, s->init_buf->data, |
32ec4153 MC |
502 | (size_t)s->init_num, s, s->msg_callback_arg); |
503 | } else { | |
d166ed8c | 504 | if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, |
a230b26e | 505 | s->init_num + SSL3_HM_HEADER_LENGTH)) { |
d166ed8c DSH |
506 | SSLerr(SSL_F_TLS_GET_MESSAGE_BODY, ERR_R_EVP_LIB); |
507 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
508 | *len = 0; | |
509 | return 0; | |
510 | } | |
32ec4153 MC |
511 | if (s->msg_callback) |
512 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, | |
513 | (size_t)s->init_num + SSL3_HM_HEADER_LENGTH, s, | |
514 | s->msg_callback_arg); | |
515 | } | |
516 | ||
eda75751 | 517 | *len = s->init_num; |
9ab930b2 | 518 | return 1; |
0f113f3e | 519 | } |
d02b48c6 | 520 | |
2e5ead83 | 521 | int ssl_cert_type(const X509 *x, const EVP_PKEY *pk) |
0f113f3e | 522 | { |
a230b26e | 523 | if (pk == NULL && (pk = X509_get0_pubkey(x)) == NULL) |
17a72388 VD |
524 | return -1; |
525 | ||
526 | switch (EVP_PKEY_id(pk)) { | |
527 | default: | |
528 | return -1; | |
529 | case EVP_PKEY_RSA: | |
530 | return SSL_PKEY_RSA_ENC; | |
531 | case EVP_PKEY_DSA: | |
532 | return SSL_PKEY_DSA_SIGN; | |
ea262260 | 533 | #ifndef OPENSSL_NO_EC |
17a72388 VD |
534 | case EVP_PKEY_EC: |
535 | return SSL_PKEY_ECC; | |
ea262260 | 536 | #endif |
2a9b9654 | 537 | #ifndef OPENSSL_NO_GOST |
17a72388 VD |
538 | case NID_id_GostR3410_2001: |
539 | return SSL_PKEY_GOST01; | |
540 | case NID_id_GostR3410_2012_256: | |
541 | return SSL_PKEY_GOST12_256; | |
542 | case NID_id_GostR3410_2012_512: | |
543 | return SSL_PKEY_GOST12_512; | |
2a9b9654 | 544 | #endif |
82049c54 | 545 | } |
0f113f3e | 546 | } |
d02b48c6 | 547 | |
6b691a5c | 548 | int ssl_verify_alarm_type(long type) |
0f113f3e MC |
549 | { |
550 | int al; | |
551 | ||
552 | switch (type) { | |
553 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: | |
554 | case X509_V_ERR_UNABLE_TO_GET_CRL: | |
555 | case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: | |
556 | al = SSL_AD_UNKNOWN_CA; | |
557 | break; | |
558 | case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: | |
559 | case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: | |
560 | case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: | |
561 | case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: | |
562 | case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: | |
563 | case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: | |
564 | case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: | |
565 | case X509_V_ERR_CERT_NOT_YET_VALID: | |
566 | case X509_V_ERR_CRL_NOT_YET_VALID: | |
567 | case X509_V_ERR_CERT_UNTRUSTED: | |
568 | case X509_V_ERR_CERT_REJECTED: | |
f3e235ed VD |
569 | case X509_V_ERR_HOSTNAME_MISMATCH: |
570 | case X509_V_ERR_EMAIL_MISMATCH: | |
571 | case X509_V_ERR_IP_ADDRESS_MISMATCH: | |
572 | case X509_V_ERR_DANE_NO_MATCH: | |
573 | case X509_V_ERR_EE_KEY_TOO_SMALL: | |
574 | case X509_V_ERR_CA_KEY_TOO_SMALL: | |
575 | case X509_V_ERR_CA_MD_TOO_WEAK: | |
0f113f3e MC |
576 | al = SSL_AD_BAD_CERTIFICATE; |
577 | break; | |
578 | case X509_V_ERR_CERT_SIGNATURE_FAILURE: | |
579 | case X509_V_ERR_CRL_SIGNATURE_FAILURE: | |
580 | al = SSL_AD_DECRYPT_ERROR; | |
581 | break; | |
582 | case X509_V_ERR_CERT_HAS_EXPIRED: | |
583 | case X509_V_ERR_CRL_HAS_EXPIRED: | |
584 | al = SSL_AD_CERTIFICATE_EXPIRED; | |
585 | break; | |
586 | case X509_V_ERR_CERT_REVOKED: | |
587 | al = SSL_AD_CERTIFICATE_REVOKED; | |
588 | break; | |
f3e235ed | 589 | case X509_V_ERR_UNSPECIFIED: |
0f113f3e | 590 | case X509_V_ERR_OUT_OF_MEM: |
f3e235ed VD |
591 | case X509_V_ERR_INVALID_CALL: |
592 | case X509_V_ERR_STORE_LOOKUP: | |
0f113f3e MC |
593 | al = SSL_AD_INTERNAL_ERROR; |
594 | break; | |
595 | case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: | |
596 | case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: | |
597 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: | |
598 | case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: | |
599 | case X509_V_ERR_CERT_CHAIN_TOO_LONG: | |
600 | case X509_V_ERR_PATH_LENGTH_EXCEEDED: | |
601 | case X509_V_ERR_INVALID_CA: | |
602 | al = SSL_AD_UNKNOWN_CA; | |
603 | break; | |
604 | case X509_V_ERR_APPLICATION_VERIFICATION: | |
605 | al = SSL_AD_HANDSHAKE_FAILURE; | |
606 | break; | |
607 | case X509_V_ERR_INVALID_PURPOSE: | |
608 | al = SSL_AD_UNSUPPORTED_CERTIFICATE; | |
609 | break; | |
610 | default: | |
611 | al = SSL_AD_CERTIFICATE_UNKNOWN; | |
612 | break; | |
613 | } | |
614 | return (al); | |
615 | } | |
d02b48c6 | 616 | |
b362ccab | 617 | int ssl_allow_compression(SSL *s) |
0f113f3e MC |
618 | { |
619 | if (s->options & SSL_OP_NO_COMPRESSION) | |
620 | return 0; | |
621 | return ssl_security(s, SSL_SECOP_COMPRESSION, 0, 0, NULL); | |
622 | } | |
4fa52141 | 623 | |
068c358a | 624 | static int version_cmp(const SSL *s, int a, int b) |
4fa52141 VD |
625 | { |
626 | int dtls = SSL_IS_DTLS(s); | |
627 | ||
628 | if (a == b) | |
629 | return 0; | |
630 | if (!dtls) | |
631 | return a < b ? -1 : 1; | |
632 | return DTLS_VERSION_LT(a, b) ? -1 : 1; | |
633 | } | |
634 | ||
635 | typedef struct { | |
636 | int version; | |
a230b26e EK |
637 | const SSL_METHOD *(*cmeth) (void); |
638 | const SSL_METHOD *(*smeth) (void); | |
4fa52141 VD |
639 | } version_info; |
640 | ||
582a17d6 MC |
641 | #if TLS_MAX_VERSION != TLS1_3_VERSION |
642 | # error Code needs update for TLS_method() support beyond TLS1_3_VERSION. | |
4fa52141 VD |
643 | #endif |
644 | ||
645 | static const version_info tls_version_table[] = { | |
582a17d6 MC |
646 | #ifndef OPENSSL_NO_TLS1_3 |
647 | {TLS1_3_VERSION, tlsv1_3_client_method, tlsv1_3_server_method}, | |
648 | #else | |
649 | {TLS1_3_VERSION, NULL, NULL}, | |
650 | #endif | |
6b01bed2 | 651 | #ifndef OPENSSL_NO_TLS1_2 |
a230b26e | 652 | {TLS1_2_VERSION, tlsv1_2_client_method, tlsv1_2_server_method}, |
6b01bed2 | 653 | #else |
a230b26e | 654 | {TLS1_2_VERSION, NULL, NULL}, |
6b01bed2 VD |
655 | #endif |
656 | #ifndef OPENSSL_NO_TLS1_1 | |
a230b26e | 657 | {TLS1_1_VERSION, tlsv1_1_client_method, tlsv1_1_server_method}, |
6b01bed2 | 658 | #else |
a230b26e | 659 | {TLS1_1_VERSION, NULL, NULL}, |
6b01bed2 VD |
660 | #endif |
661 | #ifndef OPENSSL_NO_TLS1 | |
a230b26e | 662 | {TLS1_VERSION, tlsv1_client_method, tlsv1_server_method}, |
6b01bed2 | 663 | #else |
a230b26e | 664 | {TLS1_VERSION, NULL, NULL}, |
6b01bed2 | 665 | #endif |
4fa52141 | 666 | #ifndef OPENSSL_NO_SSL3 |
a230b26e | 667 | {SSL3_VERSION, sslv3_client_method, sslv3_server_method}, |
6b01bed2 | 668 | #else |
a230b26e | 669 | {SSL3_VERSION, NULL, NULL}, |
4fa52141 | 670 | #endif |
a230b26e | 671 | {0, NULL, NULL}, |
4fa52141 VD |
672 | }; |
673 | ||
674 | #if DTLS_MAX_VERSION != DTLS1_2_VERSION | |
675 | # error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION. | |
676 | #endif | |
677 | ||
678 | static const version_info dtls_version_table[] = { | |
6b01bed2 | 679 | #ifndef OPENSSL_NO_DTLS1_2 |
a230b26e | 680 | {DTLS1_2_VERSION, dtlsv1_2_client_method, dtlsv1_2_server_method}, |
6b01bed2 | 681 | #else |
a230b26e | 682 | {DTLS1_2_VERSION, NULL, NULL}, |
6b01bed2 VD |
683 | #endif |
684 | #ifndef OPENSSL_NO_DTLS1 | |
a230b26e EK |
685 | {DTLS1_VERSION, dtlsv1_client_method, dtlsv1_server_method}, |
686 | {DTLS1_BAD_VER, dtls_bad_ver_client_method, NULL}, | |
6b01bed2 | 687 | #else |
a230b26e EK |
688 | {DTLS1_VERSION, NULL, NULL}, |
689 | {DTLS1_BAD_VER, NULL, NULL}, | |
6b01bed2 | 690 | #endif |
a230b26e | 691 | {0, NULL, NULL}, |
4fa52141 VD |
692 | }; |
693 | ||
694 | /* | |
695 | * ssl_method_error - Check whether an SSL_METHOD is enabled. | |
696 | * | |
697 | * @s: The SSL handle for the candidate method | |
698 | * @method: the intended method. | |
699 | * | |
700 | * Returns 0 on success, or an SSL error reason on failure. | |
701 | */ | |
068c358a | 702 | static int ssl_method_error(const SSL *s, const SSL_METHOD *method) |
4fa52141 VD |
703 | { |
704 | int version = method->version; | |
705 | ||
706 | if ((s->min_proto_version != 0 && | |
707 | version_cmp(s, version, s->min_proto_version) < 0) || | |
708 | ssl_security(s, SSL_SECOP_VERSION, 0, version, NULL) == 0) | |
709 | return SSL_R_VERSION_TOO_LOW; | |
710 | ||
711 | if (s->max_proto_version != 0 && | |
a230b26e | 712 | version_cmp(s, version, s->max_proto_version) > 0) |
4fa52141 VD |
713 | return SSL_R_VERSION_TOO_HIGH; |
714 | ||
715 | if ((s->options & method->mask) != 0) | |
716 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
717 | if ((method->flags & SSL_METHOD_NO_SUITEB) != 0 && tls1_suiteb(s)) | |
718 | return SSL_R_AT_LEAST_TLS_1_2_NEEDED_IN_SUITEB_MODE; | |
719 | else if ((method->flags & SSL_METHOD_NO_FIPS) != 0 && FIPS_mode()) | |
720 | return SSL_R_AT_LEAST_TLS_1_0_NEEDED_IN_FIPS_MODE; | |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
ccae4a15 FI |
725 | /* |
726 | * ssl_version_supported - Check that the specified `version` is supported by | |
727 | * `SSL *` instance | |
728 | * | |
729 | * @s: The SSL handle for the candidate method | |
730 | * @version: Protocol version to test against | |
731 | * | |
732 | * Returns 1 when supported, otherwise 0 | |
733 | */ | |
734 | int ssl_version_supported(const SSL *s, int version) | |
735 | { | |
736 | const version_info *vent; | |
737 | const version_info *table; | |
738 | ||
739 | switch (s->method->version) { | |
740 | default: | |
741 | /* Version should match method version for non-ANY method */ | |
742 | return version_cmp(s, version, s->version) == 0; | |
743 | case TLS_ANY_VERSION: | |
744 | table = tls_version_table; | |
745 | break; | |
746 | case DTLS_ANY_VERSION: | |
747 | table = dtls_version_table; | |
748 | break; | |
749 | } | |
750 | ||
751 | for (vent = table; | |
752 | vent->version != 0 && version_cmp(s, version, vent->version) <= 0; | |
753 | ++vent) { | |
754 | if (vent->cmeth != NULL && | |
755 | version_cmp(s, version, vent->version) == 0 && | |
756 | ssl_method_error(s, vent->cmeth()) == 0) { | |
757 | return 1; | |
758 | } | |
759 | } | |
760 | return 0; | |
761 | } | |
762 | ||
4fa52141 VD |
763 | /* |
764 | * ssl_check_version_downgrade - In response to RFC7507 SCSV version | |
765 | * fallback indication from a client check whether we're using the highest | |
766 | * supported protocol version. | |
767 | * | |
768 | * @s server SSL handle. | |
769 | * | |
770 | * Returns 1 when using the highest enabled version, 0 otherwise. | |
771 | */ | |
772 | int ssl_check_version_downgrade(SSL *s) | |
773 | { | |
774 | const version_info *vent; | |
775 | const version_info *table; | |
776 | ||
777 | /* | |
778 | * Check that the current protocol is the highest enabled version | |
779 | * (according to s->ctx->method, as version negotiation may have changed | |
780 | * s->method). | |
781 | */ | |
782 | if (s->version == s->ctx->method->version) | |
783 | return 1; | |
784 | ||
785 | /* | |
786 | * Apparently we're using a version-flexible SSL_METHOD (not at its | |
787 | * highest protocol version). | |
788 | */ | |
789 | if (s->ctx->method->version == TLS_method()->version) | |
790 | table = tls_version_table; | |
791 | else if (s->ctx->method->version == DTLS_method()->version) | |
792 | table = dtls_version_table; | |
793 | else { | |
794 | /* Unexpected state; fail closed. */ | |
795 | return 0; | |
796 | } | |
797 | ||
798 | for (vent = table; vent->version != 0; ++vent) { | |
a230b26e | 799 | if (vent->smeth != NULL && ssl_method_error(s, vent->smeth()) == 0) |
4fa52141 VD |
800 | return s->version == vent->version; |
801 | } | |
802 | return 0; | |
803 | } | |
804 | ||
805 | /* | |
806 | * ssl_set_version_bound - set an upper or lower bound on the supported (D)TLS | |
807 | * protocols, provided the initial (D)TLS method is version-flexible. This | |
808 | * function sanity-checks the proposed value and makes sure the method is | |
809 | * version-flexible, then sets the limit if all is well. | |
810 | * | |
811 | * @method_version: The version of the current SSL_METHOD. | |
812 | * @version: the intended limit. | |
813 | * @bound: pointer to limit to be updated. | |
814 | * | |
815 | * Returns 1 on success, 0 on failure. | |
816 | */ | |
817 | int ssl_set_version_bound(int method_version, int version, int *bound) | |
818 | { | |
869e978c KR |
819 | if (version == 0) { |
820 | *bound = version; | |
821 | return 1; | |
822 | } | |
823 | ||
4fa52141 VD |
824 | /*- |
825 | * Restrict TLS methods to TLS protocol versions. | |
826 | * Restrict DTLS methods to DTLS protocol versions. | |
827 | * Note, DTLS version numbers are decreasing, use comparison macros. | |
828 | * | |
829 | * Note that for both lower-bounds we use explicit versions, not | |
830 | * (D)TLS_MIN_VERSION. This is because we don't want to break user | |
831 | * configurations. If the MIN (supported) version ever rises, the user's | |
832 | * "floor" remains valid even if no longer available. We don't expect the | |
833 | * MAX ceiling to ever get lower, so making that variable makes sense. | |
834 | */ | |
835 | switch (method_version) { | |
836 | default: | |
837 | /* | |
838 | * XXX For fixed version methods, should we always fail and not set any | |
839 | * bounds, always succeed and not set any bounds, or set the bounds and | |
840 | * arrange to fail later if they are not met? At present fixed-version | |
841 | * methods are not subject to controls that disable individual protocol | |
842 | * versions. | |
843 | */ | |
844 | return 0; | |
845 | ||
846 | case TLS_ANY_VERSION: | |
847 | if (version < SSL3_VERSION || version > TLS_MAX_VERSION) | |
848 | return 0; | |
849 | break; | |
850 | ||
851 | case DTLS_ANY_VERSION: | |
852 | if (DTLS_VERSION_GT(version, DTLS_MAX_VERSION) || | |
032924c4 | 853 | DTLS_VERSION_LT(version, DTLS1_BAD_VER)) |
4fa52141 VD |
854 | return 0; |
855 | break; | |
856 | } | |
857 | ||
858 | *bound = version; | |
859 | return 1; | |
860 | } | |
861 | ||
862 | /* | |
863 | * ssl_choose_server_version - Choose server (D)TLS version. Called when the | |
864 | * client HELLO is received to select the final server protocol version and | |
865 | * the version specific method. | |
866 | * | |
867 | * @s: server SSL handle. | |
868 | * | |
869 | * Returns 0 on success or an SSL error reason number on failure. | |
870 | */ | |
871 | int ssl_choose_server_version(SSL *s) | |
872 | { | |
873 | /*- | |
874 | * With version-flexible methods we have an initial state with: | |
875 | * | |
876 | * s->method->version == (D)TLS_ANY_VERSION, | |
877 | * s->version == (D)TLS_MAX_VERSION. | |
878 | * | |
879 | * So we detect version-flexible methods via the method version, not the | |
880 | * handle version. | |
881 | */ | |
882 | int server_version = s->method->version; | |
883 | int client_version = s->client_version; | |
884 | const version_info *vent; | |
885 | const version_info *table; | |
886 | int disabled = 0; | |
887 | ||
888 | switch (server_version) { | |
889 | default: | |
890 | if (version_cmp(s, client_version, s->version) < 0) | |
891 | return SSL_R_WRONG_SSL_VERSION; | |
892 | /* | |
893 | * If this SSL handle is not from a version flexible method we don't | |
894 | * (and never did) check min/max FIPS or Suite B constraints. Hope | |
895 | * that's OK. It is up to the caller to not choose fixed protocol | |
896 | * versions they don't want. If not, then easy to fix, just return | |
897 | * ssl_method_error(s, s->method) | |
898 | */ | |
899 | return 0; | |
900 | case TLS_ANY_VERSION: | |
901 | table = tls_version_table; | |
902 | break; | |
903 | case DTLS_ANY_VERSION: | |
904 | table = dtls_version_table; | |
905 | break; | |
906 | } | |
907 | ||
908 | for (vent = table; vent->version != 0; ++vent) { | |
909 | const SSL_METHOD *method; | |
910 | ||
911 | if (vent->smeth == NULL || | |
912 | version_cmp(s, client_version, vent->version) < 0) | |
913 | continue; | |
914 | method = vent->smeth(); | |
915 | if (ssl_method_error(s, method) == 0) { | |
916 | s->version = vent->version; | |
917 | s->method = method; | |
918 | return 0; | |
919 | } | |
920 | disabled = 1; | |
921 | } | |
922 | return disabled ? SSL_R_UNSUPPORTED_PROTOCOL : SSL_R_VERSION_TOO_LOW; | |
923 | } | |
924 | ||
925 | /* | |
926 | * ssl_choose_client_version - Choose client (D)TLS version. Called when the | |
927 | * server HELLO is received to select the final client protocol version and | |
928 | * the version specific method. | |
929 | * | |
930 | * @s: client SSL handle. | |
931 | * @version: The proposed version from the server's HELLO. | |
932 | * | |
933 | * Returns 0 on success or an SSL error reason number on failure. | |
934 | */ | |
935 | int ssl_choose_client_version(SSL *s, int version) | |
936 | { | |
937 | const version_info *vent; | |
938 | const version_info *table; | |
939 | ||
940 | switch (s->method->version) { | |
941 | default: | |
942 | if (version != s->version) | |
943 | return SSL_R_WRONG_SSL_VERSION; | |
944 | /* | |
945 | * If this SSL handle is not from a version flexible method we don't | |
946 | * (and never did) check min/max, FIPS or Suite B constraints. Hope | |
947 | * that's OK. It is up to the caller to not choose fixed protocol | |
948 | * versions they don't want. If not, then easy to fix, just return | |
949 | * ssl_method_error(s, s->method) | |
950 | */ | |
4fa52141 VD |
951 | return 0; |
952 | case TLS_ANY_VERSION: | |
953 | table = tls_version_table; | |
954 | break; | |
955 | case DTLS_ANY_VERSION: | |
956 | table = dtls_version_table; | |
957 | break; | |
958 | } | |
959 | ||
960 | for (vent = table; vent->version != 0; ++vent) { | |
961 | const SSL_METHOD *method; | |
962 | int err; | |
963 | ||
964 | if (version != vent->version) | |
965 | continue; | |
966 | if (vent->cmeth == NULL) | |
967 | break; | |
968 | method = vent->cmeth(); | |
969 | err = ssl_method_error(s, method); | |
970 | if (err != 0) | |
971 | return err; | |
972 | s->method = method; | |
ccae4a15 | 973 | s->version = version; |
4fa52141 VD |
974 | return 0; |
975 | } | |
976 | ||
977 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
978 | } | |
979 | ||
068c358a KR |
980 | /* |
981 | * ssl_get_client_min_max_version - get minimum and maximum client version | |
982 | * @s: The SSL connection | |
983 | * @min_version: The minimum supported version | |
984 | * @max_version: The maximum supported version | |
985 | * | |
986 | * Work out what version we should be using for the initial ClientHello if the | |
987 | * version is initially (D)TLS_ANY_VERSION. We apply any explicit SSL_OP_NO_xxx | |
988 | * options, the MinProtocol and MaxProtocol configuration commands, any Suite B | |
989 | * or FIPS_mode() constraints and any floor imposed by the security level here, | |
990 | * so we don't advertise the wrong protocol version to only reject the outcome later. | |
4fa52141 | 991 | * |
0485d540 | 992 | * Computing the right floor matters. If, e.g., TLS 1.0 and 1.2 are enabled, |
4fa52141 VD |
993 | * TLS 1.1 is disabled, but the security level, Suite-B and/or MinProtocol |
994 | * only allow TLS 1.2, we want to advertise TLS1.2, *not* TLS1. | |
995 | * | |
068c358a KR |
996 | * Returns 0 on success or an SSL error reason number on failure. On failure |
997 | * min_version and max_version will also be set to 0. | |
4fa52141 | 998 | */ |
a230b26e EK |
999 | int ssl_get_client_min_max_version(const SSL *s, int *min_version, |
1000 | int *max_version) | |
4fa52141 VD |
1001 | { |
1002 | int version; | |
1003 | int hole; | |
1004 | const SSL_METHOD *single = NULL; | |
1005 | const SSL_METHOD *method; | |
1006 | const version_info *table; | |
1007 | const version_info *vent; | |
1008 | ||
1009 | switch (s->method->version) { | |
1010 | default: | |
1011 | /* | |
1012 | * If this SSL handle is not from a version flexible method we don't | |
1013 | * (and never did) check min/max FIPS or Suite B constraints. Hope | |
1014 | * that's OK. It is up to the caller to not choose fixed protocol | |
1015 | * versions they don't want. If not, then easy to fix, just return | |
1016 | * ssl_method_error(s, s->method) | |
1017 | */ | |
068c358a | 1018 | *min_version = *max_version = s->version; |
4fa52141 VD |
1019 | return 0; |
1020 | case TLS_ANY_VERSION: | |
1021 | table = tls_version_table; | |
1022 | break; | |
1023 | case DTLS_ANY_VERSION: | |
1024 | table = dtls_version_table; | |
1025 | break; | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * SSL_OP_NO_X disables all protocols above X *if* there are some protocols | |
1030 | * below X enabled. This is required in order to maintain the "version | |
1031 | * capability" vector contiguous. Any versions with a NULL client method | |
1032 | * (protocol version client is disabled at compile-time) is also a "hole". | |
1033 | * | |
1034 | * Our initial state is hole == 1, version == 0. That is, versions above | |
1035 | * the first version in the method table are disabled (a "hole" above | |
1036 | * the valid protocol entries) and we don't have a selected version yet. | |
1037 | * | |
1038 | * Whenever "hole == 1", and we hit an enabled method, its version becomes | |
1039 | * the selected version, and the method becomes a candidate "single" | |
1040 | * method. We're no longer in a hole, so "hole" becomes 0. | |
1041 | * | |
1042 | * If "hole == 0" and we hit an enabled method, then "single" is cleared, | |
1043 | * as we support a contiguous range of at least two methods. If we hit | |
1044 | * a disabled method, then hole becomes true again, but nothing else | |
1045 | * changes yet, because all the remaining methods may be disabled too. | |
1046 | * If we again hit an enabled method after the new hole, it becomes | |
1047 | * selected, as we start from scratch. | |
1048 | */ | |
068c358a | 1049 | *min_version = version = 0; |
4fa52141 VD |
1050 | hole = 1; |
1051 | for (vent = table; vent->version != 0; ++vent) { | |
1052 | /* | |
1053 | * A table entry with a NULL client method is still a hole in the | |
1054 | * "version capability" vector. | |
1055 | */ | |
1056 | if (vent->cmeth == NULL) { | |
1057 | hole = 1; | |
1058 | continue; | |
1059 | } | |
1060 | method = vent->cmeth(); | |
1061 | if (ssl_method_error(s, method) != 0) { | |
1062 | hole = 1; | |
1063 | } else if (!hole) { | |
1064 | single = NULL; | |
068c358a | 1065 | *min_version = method->version; |
4fa52141 VD |
1066 | } else { |
1067 | version = (single = method)->version; | |
068c358a | 1068 | *min_version = version; |
4fa52141 VD |
1069 | hole = 0; |
1070 | } | |
1071 | } | |
1072 | ||
068c358a KR |
1073 | *max_version = version; |
1074 | ||
4fa52141 VD |
1075 | /* Fail if everything is disabled */ |
1076 | if (version == 0) | |
1077 | return SSL_R_NO_PROTOCOLS_AVAILABLE; | |
1078 | ||
068c358a KR |
1079 | return 0; |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * ssl_set_client_hello_version - Work out what version we should be using for | |
1084 | * the initial ClientHello. | |
1085 | * | |
1086 | * @s: client SSL handle. | |
1087 | * | |
1088 | * Returns 0 on success or an SSL error reason number on failure. | |
1089 | */ | |
1090 | int ssl_set_client_hello_version(SSL *s) | |
1091 | { | |
3eb2aff4 | 1092 | int ver_min, ver_max, ret; |
068c358a | 1093 | |
3eb2aff4 | 1094 | ret = ssl_get_client_min_max_version(s, &ver_min, &ver_max); |
068c358a KR |
1095 | |
1096 | if (ret != 0) | |
1097 | return ret; | |
1098 | ||
3eb2aff4 | 1099 | s->client_version = s->version = ver_max; |
4fa52141 VD |
1100 | return 0; |
1101 | } |