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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; | |
33 | ||
34 | ret = ssl3_write_bytes(s, type, &s->init_buf->data[s->init_off], | |
35 | s->init_num); | |
36 | if (ret < 0) | |
37 | return (-1); | |
38 | if (type == SSL3_RT_HANDSHAKE) | |
39 | /* | |
40 | * should not be done for 'Hello Request's, but in that case we'll | |
41 | * ignore the result anyway | |
42 | */ | |
d166ed8c DSH |
43 | if (!ssl3_finish_mac(s, |
44 | (unsigned char *)&s->init_buf->data[s->init_off], | |
45 | ret)) | |
46 | return -1; | |
0f113f3e MC |
47 | |
48 | if (ret == s->init_num) { | |
49 | if (s->msg_callback) | |
50 | s->msg_callback(1, s->version, type, s->init_buf->data, | |
51 | (size_t)(s->init_off + s->init_num), s, | |
52 | s->msg_callback_arg); | |
53 | return (1); | |
54 | } | |
55 | s->init_off += ret; | |
56 | s->init_num -= ret; | |
57 | return (0); | |
58 | } | |
e7ecc7d4 | 59 | |
4a01c59f | 60 | int tls_close_construct_packet(SSL *s, WPACKET *pkt, int htype) |
2c7b4dbc MC |
61 | { |
62 | size_t msglen; | |
63 | ||
4a01c59f | 64 | if ((htype != SSL3_MT_CHANGE_CIPHER_SPEC && !WPACKET_close(pkt)) |
f1ec23c0 | 65 | || !WPACKET_get_length(pkt, &msglen) |
7cea05dc | 66 | || msglen > INT_MAX) |
2c7b4dbc MC |
67 | return 0; |
68 | s->init_num = (int)msglen; | |
69 | s->init_off = 0; | |
70 | ||
71 | return 1; | |
72 | } | |
73 | ||
7cea05dc | 74 | int tls_construct_finished(SSL *s, WPACKET *pkt, const char *sender, int slen) |
0f113f3e | 75 | { |
0f113f3e | 76 | int i; |
0f113f3e | 77 | |
b9908bf9 MC |
78 | i = s->method->ssl3_enc->final_finish_mac(s, |
79 | sender, slen, | |
80 | s->s3->tmp.finish_md); | |
4f89bfbf MC |
81 | if (i <= 0) { |
82 | SSLerr(SSL_F_TLS_CONSTRUCT_FINISHED, ERR_R_INTERNAL_ERROR); | |
83 | goto err; | |
84 | } | |
85 | ||
b9908bf9 | 86 | s->s3->tmp.finish_md_len = i; |
4f89bfbf | 87 | |
7cea05dc | 88 | if (!WPACKET_memcpy(pkt, s->s3->tmp.finish_md, i)) { |
4f89bfbf MC |
89 | SSLerr(SSL_F_TLS_CONSTRUCT_FINISHED, ERR_R_INTERNAL_ERROR); |
90 | goto err; | |
91 | } | |
0f113f3e | 92 | |
b9908bf9 MC |
93 | /* |
94 | * Copy the finished so we can use it for renegotiation checks | |
95 | */ | |
23a635c0 | 96 | if (!s->server) { |
b9908bf9 MC |
97 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); |
98 | memcpy(s->s3->previous_client_finished, s->s3->tmp.finish_md, i); | |
99 | s->s3->previous_client_finished_len = i; | |
100 | } else { | |
101 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); | |
102 | memcpy(s->s3->previous_server_finished, s->s3->tmp.finish_md, i); | |
103 | s->s3->previous_server_finished_len = i; | |
104 | } | |
0f113f3e | 105 | |
b9908bf9 | 106 | return 1; |
4f89bfbf | 107 | err: |
4f89bfbf MC |
108 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
109 | return 0; | |
0f113f3e | 110 | } |
d02b48c6 | 111 | |
bf48836c | 112 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
113 | /* |
114 | * ssl3_take_mac calculates the Finished MAC for the handshakes messages seen | |
115 | * to far. | |
116 | */ | |
ee2ffc27 | 117 | static void ssl3_take_mac(SSL *s) |
0f113f3e MC |
118 | { |
119 | const char *sender; | |
120 | int slen; | |
121 | /* | |
122 | * If no new cipher setup return immediately: other functions will set | |
123 | * the appropriate error. | |
124 | */ | |
125 | if (s->s3->tmp.new_cipher == NULL) | |
126 | return; | |
49ae7423 | 127 | if (!s->server) { |
0f113f3e MC |
128 | sender = s->method->ssl3_enc->server_finished_label; |
129 | slen = s->method->ssl3_enc->server_finished_label_len; | |
130 | } else { | |
131 | sender = s->method->ssl3_enc->client_finished_label; | |
132 | slen = s->method->ssl3_enc->client_finished_label_len; | |
133 | } | |
134 | ||
135 | s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s, | |
136 | sender, | |
137 | slen, | |
138 | s->s3->tmp.peer_finish_md); | |
139 | } | |
ee2ffc27 BL |
140 | #endif |
141 | ||
be3583fa | 142 | MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt) |
b9908bf9 MC |
143 | { |
144 | int al; | |
73999b62 | 145 | long remain; |
4fa52141 | 146 | |
73999b62 | 147 | remain = PACKET_remaining(pkt); |
657da85e MC |
148 | /* |
149 | * 'Change Cipher Spec' is just a single byte, which should already have | |
c69f2adf MC |
150 | * been consumed by ssl_get_message() so there should be no bytes left, |
151 | * unless we're using DTLS1_BAD_VER, which has an extra 2 bytes | |
657da85e | 152 | */ |
c69f2adf | 153 | if (SSL_IS_DTLS(s)) { |
73999b62 | 154 | if ((s->version == DTLS1_BAD_VER |
a230b26e EK |
155 | && remain != DTLS1_CCS_HEADER_LENGTH + 1) |
156 | || (s->version != DTLS1_BAD_VER | |
157 | && remain != DTLS1_CCS_HEADER_LENGTH - 1)) { | |
158 | al = SSL_AD_ILLEGAL_PARAMETER; | |
159 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, | |
160 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
161 | goto f_err; | |
c69f2adf MC |
162 | } |
163 | } else { | |
73999b62 | 164 | if (remain != 0) { |
c69f2adf | 165 | al = SSL_AD_ILLEGAL_PARAMETER; |
b9908bf9 MC |
166 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, |
167 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
c69f2adf MC |
168 | goto f_err; |
169 | } | |
657da85e MC |
170 | } |
171 | ||
172 | /* Check we have a cipher to change to */ | |
173 | if (s->s3->tmp.new_cipher == NULL) { | |
174 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
b9908bf9 | 175 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, SSL_R_CCS_RECEIVED_EARLY); |
657da85e MC |
176 | goto f_err; |
177 | } | |
178 | ||
179 | s->s3->change_cipher_spec = 1; | |
180 | if (!ssl3_do_change_cipher_spec(s)) { | |
181 | al = SSL_AD_INTERNAL_ERROR; | |
b9908bf9 | 182 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); |
657da85e MC |
183 | goto f_err; |
184 | } | |
185 | ||
c69f2adf MC |
186 | if (SSL_IS_DTLS(s)) { |
187 | dtls1_reset_seq_numbers(s, SSL3_CC_READ); | |
188 | ||
189 | if (s->version == DTLS1_BAD_VER) | |
190 | s->d1->handshake_read_seq++; | |
191 | ||
192 | #ifndef OPENSSL_NO_SCTP | |
193 | /* | |
194 | * Remember that a CCS has been received, so that an old key of | |
195 | * SCTP-Auth can be deleted when a CCS is sent. Will be ignored if no | |
196 | * SCTP is used | |
197 | */ | |
198 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL); | |
199 | #endif | |
200 | } | |
201 | ||
b9908bf9 | 202 | return MSG_PROCESS_CONTINUE_READING; |
657da85e MC |
203 | f_err: |
204 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 205 | ossl_statem_set_error(s); |
b9908bf9 | 206 | return MSG_PROCESS_ERROR; |
657da85e MC |
207 | } |
208 | ||
be3583fa | 209 | MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt) |
b9908bf9 MC |
210 | { |
211 | int al, i; | |
b9908bf9 | 212 | |
0f113f3e MC |
213 | /* If this occurs, we have missed a message */ |
214 | if (!s->s3->change_cipher_spec) { | |
215 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
b9908bf9 | 216 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_GOT_A_FIN_BEFORE_A_CCS); |
0f113f3e MC |
217 | goto f_err; |
218 | } | |
219 | s->s3->change_cipher_spec = 0; | |
220 | ||
0f113f3e MC |
221 | i = s->s3->tmp.peer_finish_md_len; |
222 | ||
956de7b2 | 223 | if ((unsigned long)i != PACKET_remaining(pkt)) { |
0f113f3e | 224 | al = SSL_AD_DECODE_ERROR; |
b9908bf9 | 225 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_BAD_DIGEST_LENGTH); |
0f113f3e MC |
226 | goto f_err; |
227 | } | |
228 | ||
73999b62 | 229 | if (CRYPTO_memcmp(PACKET_data(pkt), s->s3->tmp.peer_finish_md, i) != 0) { |
0f113f3e | 230 | al = SSL_AD_DECRYPT_ERROR; |
b9908bf9 | 231 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_DIGEST_CHECK_FAILED); |
0f113f3e MC |
232 | goto f_err; |
233 | } | |
234 | ||
235 | /* | |
236 | * Copy the finished so we can use it for renegotiation checks | |
237 | */ | |
23a635c0 | 238 | if (s->server) { |
0f113f3e MC |
239 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); |
240 | memcpy(s->s3->previous_client_finished, s->s3->tmp.peer_finish_md, i); | |
241 | s->s3->previous_client_finished_len = i; | |
242 | } else { | |
243 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); | |
244 | memcpy(s->s3->previous_server_finished, s->s3->tmp.peer_finish_md, i); | |
245 | s->s3->previous_server_finished_len = i; | |
246 | } | |
247 | ||
e6575156 | 248 | return MSG_PROCESS_FINISHED_READING; |
0f113f3e MC |
249 | f_err: |
250 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 251 | ossl_statem_set_error(s); |
b9908bf9 | 252 | return MSG_PROCESS_ERROR; |
0f113f3e | 253 | } |
d02b48c6 | 254 | |
7cea05dc | 255 | int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt) |
b9908bf9 | 256 | { |
7cea05dc | 257 | if (!WPACKET_put_bytes_u8(pkt, SSL3_MT_CCS)) { |
3c106325 | 258 | SSLerr(SSL_F_TLS_CONSTRUCT_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); |
85a7a5e6 MC |
259 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
260 | return 0; | |
261 | } | |
b9908bf9 | 262 | |
b9908bf9 MC |
263 | return 1; |
264 | } | |
265 | ||
7cea05dc | 266 | unsigned long ssl3_output_cert_chain(SSL *s, WPACKET *pkt, CERT_PKEY *cpk) |
0f113f3e | 267 | { |
5923ad4b | 268 | if (!WPACKET_start_sub_packet_u24(pkt) |
7cea05dc | 269 | || !ssl_add_cert_chain(s, pkt, cpk) |
5923ad4b | 270 | || !WPACKET_close(pkt)) { |
c49e1912 | 271 | SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN, ERR_R_INTERNAL_ERROR); |
7cea05dc | 272 | return 0; |
77d514c5 | 273 | } |
c49e1912 | 274 | return 1; |
0f113f3e MC |
275 | } |
276 | ||
be3583fa | 277 | WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst) |
8723588e MC |
278 | { |
279 | void (*cb) (const SSL *ssl, int type, int val) = NULL; | |
280 | ||
281 | #ifndef OPENSSL_NO_SCTP | |
282 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) { | |
be3583fa | 283 | WORK_STATE ret; |
8723588e MC |
284 | ret = dtls_wait_for_dry(s); |
285 | if (ret != WORK_FINISHED_CONTINUE) | |
286 | return ret; | |
287 | } | |
288 | #endif | |
289 | ||
290 | /* clean a few things up */ | |
291 | ssl3_cleanup_key_block(s); | |
473483d4 MC |
292 | |
293 | if (!SSL_IS_DTLS(s)) { | |
294 | /* | |
295 | * We don't do this in DTLS because we may still need the init_buf | |
296 | * in case there are any unexpected retransmits | |
297 | */ | |
298 | BUF_MEM_free(s->init_buf); | |
299 | s->init_buf = NULL; | |
300 | } | |
8723588e MC |
301 | |
302 | ssl_free_wbio_buffer(s); | |
303 | ||
304 | s->init_num = 0; | |
305 | ||
306 | if (!s->server || s->renegotiate == 2) { | |
307 | /* skipped if we just sent a HelloRequest */ | |
308 | s->renegotiate = 0; | |
309 | s->new_session = 0; | |
310 | ||
311 | if (s->server) { | |
8723588e MC |
312 | ssl_update_cache(s, SSL_SESS_CACHE_SERVER); |
313 | ||
314 | s->ctx->stats.sess_accept_good++; | |
fe3a3291 | 315 | s->handshake_func = ossl_statem_accept; |
8723588e MC |
316 | } else { |
317 | ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); | |
318 | if (s->hit) | |
319 | s->ctx->stats.sess_hit++; | |
320 | ||
fe3a3291 | 321 | s->handshake_func = ossl_statem_connect; |
8723588e MC |
322 | s->ctx->stats.sess_connect_good++; |
323 | } | |
324 | ||
325 | if (s->info_callback != NULL) | |
326 | cb = s->info_callback; | |
327 | else if (s->ctx->info_callback != NULL) | |
328 | cb = s->ctx->info_callback; | |
329 | ||
330 | if (cb != NULL) | |
331 | cb(s, SSL_CB_HANDSHAKE_DONE, 1); | |
332 | ||
333 | if (SSL_IS_DTLS(s)) { | |
334 | /* done with handshaking */ | |
335 | s->d1->handshake_read_seq = 0; | |
336 | s->d1->handshake_write_seq = 0; | |
337 | s->d1->next_handshake_write_seq = 0; | |
f5c7f5df | 338 | dtls1_clear_received_buffer(s); |
8723588e MC |
339 | } |
340 | } | |
341 | ||
342 | return WORK_FINISHED_STOP; | |
343 | } | |
344 | ||
9ab930b2 MC |
345 | int tls_get_message_header(SSL *s, int *mt) |
346 | { | |
347 | /* s->init_num < SSL3_HM_HEADER_LENGTH */ | |
348 | int skip_message, i, recvd_type, al; | |
349 | unsigned char *p; | |
350 | unsigned long l; | |
351 | ||
352 | p = (unsigned char *)s->init_buf->data; | |
353 | ||
354 | do { | |
355 | while (s->init_num < SSL3_HM_HEADER_LENGTH) { | |
356 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &recvd_type, | |
a230b26e EK |
357 | &p[s->init_num], |
358 | SSL3_HM_HEADER_LENGTH - s->init_num, | |
359 | 0); | |
9ab930b2 MC |
360 | if (i <= 0) { |
361 | s->rwstate = SSL_READING; | |
362 | return 0; | |
32ec4153 | 363 | } |
9ab930b2 | 364 | if (recvd_type == SSL3_RT_CHANGE_CIPHER_SPEC) { |
1257adec | 365 | /* |
a230b26e EK |
366 | * A ChangeCipherSpec must be a single byte and may not occur |
367 | * in the middle of a handshake message. | |
368 | */ | |
1257adec DB |
369 | if (s->init_num != 0 || i != 1 || p[0] != SSL3_MT_CCS) { |
370 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
371 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, | |
372 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
373 | goto f_err; | |
374 | } | |
9ab930b2 MC |
375 | s->s3->tmp.message_type = *mt = SSL3_MT_CHANGE_CIPHER_SPEC; |
376 | s->init_num = i - 1; | |
377 | s->s3->tmp.message_size = i; | |
378 | return 1; | |
379 | } else if (recvd_type != SSL3_RT_HANDSHAKE) { | |
380 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
381 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_CCS_RECEIVED_EARLY); | |
32ec4153 MC |
382 | goto f_err; |
383 | } | |
9ab930b2 MC |
384 | s->init_num += i; |
385 | } | |
386 | ||
387 | skip_message = 0; | |
388 | if (!s->server) | |
389 | if (p[0] == SSL3_MT_HELLO_REQUEST) | |
390 | /* | |
391 | * The server may always send 'Hello Request' messages -- | |
392 | * we are doing a handshake anyway now, so ignore them if | |
393 | * their format is correct. Does not count for 'Finished' | |
394 | * MAC. | |
395 | */ | |
396 | if (p[1] == 0 && p[2] == 0 && p[3] == 0) { | |
397 | s->init_num = 0; | |
398 | skip_message = 1; | |
399 | ||
400 | if (s->msg_callback) | |
401 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
402 | p, SSL3_HM_HEADER_LENGTH, s, | |
403 | s->msg_callback_arg); | |
404 | } | |
405 | } while (skip_message); | |
406 | /* s->init_num == SSL3_HM_HEADER_LENGTH */ | |
407 | ||
408 | *mt = *p; | |
409 | s->s3->tmp.message_type = *(p++); | |
32ec4153 | 410 | |
e8aa8b6c | 411 | if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { |
9ab930b2 MC |
412 | /* |
413 | * Only happens with SSLv3+ in an SSLv2 backward compatible | |
414 | * ClientHello | |
e8aa8b6c F |
415 | * |
416 | * Total message size is the remaining record bytes to read | |
417 | * plus the SSL3_HM_HEADER_LENGTH bytes that we already read | |
9ab930b2 | 418 | */ |
9ab930b2 MC |
419 | l = RECORD_LAYER_get_rrec_length(&s->rlayer) |
420 | + SSL3_HM_HEADER_LENGTH; | |
9ab930b2 MC |
421 | s->s3->tmp.message_size = l; |
422 | ||
423 | s->init_msg = s->init_buf->data; | |
424 | s->init_num = SSL3_HM_HEADER_LENGTH; | |
425 | } else { | |
426 | n2l3(p, l); | |
427 | /* BUF_MEM_grow takes an 'int' parameter */ | |
428 | if (l > (INT_MAX - SSL3_HM_HEADER_LENGTH)) { | |
429 | al = SSL_AD_ILLEGAL_PARAMETER; | |
430 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
431 | goto f_err; | |
32ec4153 | 432 | } |
9ab930b2 MC |
433 | s->s3->tmp.message_size = l; |
434 | ||
435 | s->init_msg = s->init_buf->data + SSL3_HM_HEADER_LENGTH; | |
436 | s->init_num = 0; | |
437 | } | |
438 | ||
439 | return 1; | |
440 | f_err: | |
441 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
9ab930b2 MC |
442 | return 0; |
443 | } | |
444 | ||
445 | int tls_get_message_body(SSL *s, unsigned long *len) | |
446 | { | |
447 | long n; | |
448 | unsigned char *p; | |
449 | int i; | |
450 | ||
451 | if (s->s3->tmp.message_type == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
452 | /* We've already read everything in */ | |
453 | *len = (unsigned long)s->init_num; | |
454 | return 1; | |
0f113f3e MC |
455 | } |
456 | ||
0f113f3e MC |
457 | p = s->init_msg; |
458 | n = s->s3->tmp.message_size - s->init_num; | |
459 | while (n > 0) { | |
657da85e MC |
460 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL, |
461 | &p[s->init_num], n, 0); | |
0f113f3e MC |
462 | if (i <= 0) { |
463 | s->rwstate = SSL_READING; | |
9ab930b2 MC |
464 | *len = 0; |
465 | return 0; | |
0f113f3e MC |
466 | } |
467 | s->init_num += i; | |
468 | n -= i; | |
469 | } | |
ee2ffc27 | 470 | |
bf48836c | 471 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
472 | /* |
473 | * If receiving Finished, record MAC of prior handshake messages for | |
474 | * Finished verification. | |
475 | */ | |
476 | if (*s->init_buf->data == SSL3_MT_FINISHED) | |
477 | ssl3_take_mac(s); | |
ee2ffc27 BL |
478 | #endif |
479 | ||
0f113f3e | 480 | /* Feed this message into MAC computation. */ |
e8aa8b6c | 481 | if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { |
d166ed8c DSH |
482 | if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, |
483 | s->init_num)) { | |
484 | SSLerr(SSL_F_TLS_GET_MESSAGE_BODY, ERR_R_EVP_LIB); | |
485 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
486 | *len = 0; | |
487 | return 0; | |
488 | } | |
32ec4153 | 489 | if (s->msg_callback) |
a230b26e | 490 | s->msg_callback(0, SSL2_VERSION, 0, s->init_buf->data, |
32ec4153 MC |
491 | (size_t)s->init_num, s, s->msg_callback_arg); |
492 | } else { | |
d166ed8c | 493 | if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, |
a230b26e | 494 | s->init_num + SSL3_HM_HEADER_LENGTH)) { |
d166ed8c DSH |
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 MC |
500 | if (s->msg_callback) |
501 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, | |
502 | (size_t)s->init_num + SSL3_HM_HEADER_LENGTH, s, | |
503 | s->msg_callback_arg); | |
504 | } | |
505 | ||
9ab930b2 MC |
506 | /* |
507 | * init_num should never be negative...should probably be declared | |
508 | * unsigned | |
509 | */ | |
510 | if (s->init_num < 0) { | |
511 | SSLerr(SSL_F_TLS_GET_MESSAGE_BODY, ERR_R_INTERNAL_ERROR); | |
512 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
513 | *len = 0; | |
514 | return 0; | |
515 | } | |
516 | *len = (unsigned long)s->init_num; | |
517 | return 1; | |
0f113f3e | 518 | } |
d02b48c6 | 519 | |
2e5ead83 | 520 | int ssl_cert_type(const X509 *x, const EVP_PKEY *pk) |
0f113f3e | 521 | { |
a230b26e | 522 | if (pk == NULL && (pk = X509_get0_pubkey(x)) == NULL) |
17a72388 VD |
523 | return -1; |
524 | ||
525 | switch (EVP_PKEY_id(pk)) { | |
526 | default: | |
527 | return -1; | |
528 | case EVP_PKEY_RSA: | |
529 | return SSL_PKEY_RSA_ENC; | |
530 | case EVP_PKEY_DSA: | |
531 | return SSL_PKEY_DSA_SIGN; | |
ea262260 | 532 | #ifndef OPENSSL_NO_EC |
17a72388 VD |
533 | case EVP_PKEY_EC: |
534 | return SSL_PKEY_ECC; | |
ea262260 | 535 | #endif |
2a9b9654 | 536 | #ifndef OPENSSL_NO_GOST |
17a72388 VD |
537 | case NID_id_GostR3410_2001: |
538 | return SSL_PKEY_GOST01; | |
539 | case NID_id_GostR3410_2012_256: | |
540 | return SSL_PKEY_GOST12_256; | |
541 | case NID_id_GostR3410_2012_512: | |
542 | return SSL_PKEY_GOST12_512; | |
2a9b9654 | 543 | #endif |
82049c54 | 544 | } |
0f113f3e | 545 | } |
d02b48c6 | 546 | |
6b691a5c | 547 | int ssl_verify_alarm_type(long type) |
0f113f3e MC |
548 | { |
549 | int al; | |
550 | ||
551 | switch (type) { | |
552 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: | |
553 | case X509_V_ERR_UNABLE_TO_GET_CRL: | |
554 | case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: | |
555 | al = SSL_AD_UNKNOWN_CA; | |
556 | break; | |
557 | case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: | |
558 | case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: | |
559 | case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: | |
560 | case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: | |
561 | case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: | |
562 | case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: | |
563 | case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: | |
564 | case X509_V_ERR_CERT_NOT_YET_VALID: | |
565 | case X509_V_ERR_CRL_NOT_YET_VALID: | |
566 | case X509_V_ERR_CERT_UNTRUSTED: | |
567 | case X509_V_ERR_CERT_REJECTED: | |
f3e235ed VD |
568 | case X509_V_ERR_HOSTNAME_MISMATCH: |
569 | case X509_V_ERR_EMAIL_MISMATCH: | |
570 | case X509_V_ERR_IP_ADDRESS_MISMATCH: | |
571 | case X509_V_ERR_DANE_NO_MATCH: | |
572 | case X509_V_ERR_EE_KEY_TOO_SMALL: | |
573 | case X509_V_ERR_CA_KEY_TOO_SMALL: | |
574 | case X509_V_ERR_CA_MD_TOO_WEAK: | |
0f113f3e MC |
575 | al = SSL_AD_BAD_CERTIFICATE; |
576 | break; | |
577 | case X509_V_ERR_CERT_SIGNATURE_FAILURE: | |
578 | case X509_V_ERR_CRL_SIGNATURE_FAILURE: | |
579 | al = SSL_AD_DECRYPT_ERROR; | |
580 | break; | |
581 | case X509_V_ERR_CERT_HAS_EXPIRED: | |
582 | case X509_V_ERR_CRL_HAS_EXPIRED: | |
583 | al = SSL_AD_CERTIFICATE_EXPIRED; | |
584 | break; | |
585 | case X509_V_ERR_CERT_REVOKED: | |
586 | al = SSL_AD_CERTIFICATE_REVOKED; | |
587 | break; | |
f3e235ed | 588 | case X509_V_ERR_UNSPECIFIED: |
0f113f3e | 589 | case X509_V_ERR_OUT_OF_MEM: |
f3e235ed VD |
590 | case X509_V_ERR_INVALID_CALL: |
591 | case X509_V_ERR_STORE_LOOKUP: | |
0f113f3e MC |
592 | al = SSL_AD_INTERNAL_ERROR; |
593 | break; | |
594 | case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: | |
595 | case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: | |
596 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: | |
597 | case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: | |
598 | case X509_V_ERR_CERT_CHAIN_TOO_LONG: | |
599 | case X509_V_ERR_PATH_LENGTH_EXCEEDED: | |
600 | case X509_V_ERR_INVALID_CA: | |
601 | al = SSL_AD_UNKNOWN_CA; | |
602 | break; | |
603 | case X509_V_ERR_APPLICATION_VERIFICATION: | |
604 | al = SSL_AD_HANDSHAKE_FAILURE; | |
605 | break; | |
606 | case X509_V_ERR_INVALID_PURPOSE: | |
607 | al = SSL_AD_UNSUPPORTED_CERTIFICATE; | |
608 | break; | |
609 | default: | |
610 | al = SSL_AD_CERTIFICATE_UNKNOWN; | |
611 | break; | |
612 | } | |
613 | return (al); | |
614 | } | |
d02b48c6 | 615 | |
b362ccab | 616 | int ssl_allow_compression(SSL *s) |
0f113f3e MC |
617 | { |
618 | if (s->options & SSL_OP_NO_COMPRESSION) | |
619 | return 0; | |
620 | return ssl_security(s, SSL_SECOP_COMPRESSION, 0, 0, NULL); | |
621 | } | |
4fa52141 | 622 | |
068c358a | 623 | static int version_cmp(const SSL *s, int a, int b) |
4fa52141 VD |
624 | { |
625 | int dtls = SSL_IS_DTLS(s); | |
626 | ||
627 | if (a == b) | |
628 | return 0; | |
629 | if (!dtls) | |
630 | return a < b ? -1 : 1; | |
631 | return DTLS_VERSION_LT(a, b) ? -1 : 1; | |
632 | } | |
633 | ||
634 | typedef struct { | |
635 | int version; | |
a230b26e EK |
636 | const SSL_METHOD *(*cmeth) (void); |
637 | const SSL_METHOD *(*smeth) (void); | |
4fa52141 VD |
638 | } version_info; |
639 | ||
640 | #if TLS_MAX_VERSION != TLS1_2_VERSION | |
641 | # error Code needs update for TLS_method() support beyond TLS1_2_VERSION. | |
642 | #endif | |
643 | ||
644 | static const version_info tls_version_table[] = { | |
6b01bed2 | 645 | #ifndef OPENSSL_NO_TLS1_2 |
a230b26e | 646 | {TLS1_2_VERSION, tlsv1_2_client_method, tlsv1_2_server_method}, |
6b01bed2 | 647 | #else |
a230b26e | 648 | {TLS1_2_VERSION, NULL, NULL}, |
6b01bed2 VD |
649 | #endif |
650 | #ifndef OPENSSL_NO_TLS1_1 | |
a230b26e | 651 | {TLS1_1_VERSION, tlsv1_1_client_method, tlsv1_1_server_method}, |
6b01bed2 | 652 | #else |
a230b26e | 653 | {TLS1_1_VERSION, NULL, NULL}, |
6b01bed2 VD |
654 | #endif |
655 | #ifndef OPENSSL_NO_TLS1 | |
a230b26e | 656 | {TLS1_VERSION, tlsv1_client_method, tlsv1_server_method}, |
6b01bed2 | 657 | #else |
a230b26e | 658 | {TLS1_VERSION, NULL, NULL}, |
6b01bed2 | 659 | #endif |
4fa52141 | 660 | #ifndef OPENSSL_NO_SSL3 |
a230b26e | 661 | {SSL3_VERSION, sslv3_client_method, sslv3_server_method}, |
6b01bed2 | 662 | #else |
a230b26e | 663 | {SSL3_VERSION, NULL, NULL}, |
4fa52141 | 664 | #endif |
a230b26e | 665 | {0, NULL, NULL}, |
4fa52141 VD |
666 | }; |
667 | ||
668 | #if DTLS_MAX_VERSION != DTLS1_2_VERSION | |
669 | # error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION. | |
670 | #endif | |
671 | ||
672 | static const version_info dtls_version_table[] = { | |
6b01bed2 | 673 | #ifndef OPENSSL_NO_DTLS1_2 |
a230b26e | 674 | {DTLS1_2_VERSION, dtlsv1_2_client_method, dtlsv1_2_server_method}, |
6b01bed2 | 675 | #else |
a230b26e | 676 | {DTLS1_2_VERSION, NULL, NULL}, |
6b01bed2 VD |
677 | #endif |
678 | #ifndef OPENSSL_NO_DTLS1 | |
a230b26e EK |
679 | {DTLS1_VERSION, dtlsv1_client_method, dtlsv1_server_method}, |
680 | {DTLS1_BAD_VER, dtls_bad_ver_client_method, NULL}, | |
6b01bed2 | 681 | #else |
a230b26e EK |
682 | {DTLS1_VERSION, NULL, NULL}, |
683 | {DTLS1_BAD_VER, NULL, NULL}, | |
6b01bed2 | 684 | #endif |
a230b26e | 685 | {0, NULL, NULL}, |
4fa52141 VD |
686 | }; |
687 | ||
688 | /* | |
689 | * ssl_method_error - Check whether an SSL_METHOD is enabled. | |
690 | * | |
691 | * @s: The SSL handle for the candidate method | |
692 | * @method: the intended method. | |
693 | * | |
694 | * Returns 0 on success, or an SSL error reason on failure. | |
695 | */ | |
068c358a | 696 | static int ssl_method_error(const SSL *s, const SSL_METHOD *method) |
4fa52141 VD |
697 | { |
698 | int version = method->version; | |
699 | ||
700 | if ((s->min_proto_version != 0 && | |
701 | version_cmp(s, version, s->min_proto_version) < 0) || | |
702 | ssl_security(s, SSL_SECOP_VERSION, 0, version, NULL) == 0) | |
703 | return SSL_R_VERSION_TOO_LOW; | |
704 | ||
705 | if (s->max_proto_version != 0 && | |
a230b26e | 706 | version_cmp(s, version, s->max_proto_version) > 0) |
4fa52141 VD |
707 | return SSL_R_VERSION_TOO_HIGH; |
708 | ||
709 | if ((s->options & method->mask) != 0) | |
710 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
711 | if ((method->flags & SSL_METHOD_NO_SUITEB) != 0 && tls1_suiteb(s)) | |
712 | return SSL_R_AT_LEAST_TLS_1_2_NEEDED_IN_SUITEB_MODE; | |
713 | else if ((method->flags & SSL_METHOD_NO_FIPS) != 0 && FIPS_mode()) | |
714 | return SSL_R_AT_LEAST_TLS_1_0_NEEDED_IN_FIPS_MODE; | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
ccae4a15 FI |
719 | /* |
720 | * ssl_version_supported - Check that the specified `version` is supported by | |
721 | * `SSL *` instance | |
722 | * | |
723 | * @s: The SSL handle for the candidate method | |
724 | * @version: Protocol version to test against | |
725 | * | |
726 | * Returns 1 when supported, otherwise 0 | |
727 | */ | |
728 | int ssl_version_supported(const SSL *s, int version) | |
729 | { | |
730 | const version_info *vent; | |
731 | const version_info *table; | |
732 | ||
733 | switch (s->method->version) { | |
734 | default: | |
735 | /* Version should match method version for non-ANY method */ | |
736 | return version_cmp(s, version, s->version) == 0; | |
737 | case TLS_ANY_VERSION: | |
738 | table = tls_version_table; | |
739 | break; | |
740 | case DTLS_ANY_VERSION: | |
741 | table = dtls_version_table; | |
742 | break; | |
743 | } | |
744 | ||
745 | for (vent = table; | |
746 | vent->version != 0 && version_cmp(s, version, vent->version) <= 0; | |
747 | ++vent) { | |
748 | if (vent->cmeth != NULL && | |
749 | version_cmp(s, version, vent->version) == 0 && | |
750 | ssl_method_error(s, vent->cmeth()) == 0) { | |
751 | return 1; | |
752 | } | |
753 | } | |
754 | return 0; | |
755 | } | |
756 | ||
4fa52141 VD |
757 | /* |
758 | * ssl_check_version_downgrade - In response to RFC7507 SCSV version | |
759 | * fallback indication from a client check whether we're using the highest | |
760 | * supported protocol version. | |
761 | * | |
762 | * @s server SSL handle. | |
763 | * | |
764 | * Returns 1 when using the highest enabled version, 0 otherwise. | |
765 | */ | |
766 | int ssl_check_version_downgrade(SSL *s) | |
767 | { | |
768 | const version_info *vent; | |
769 | const version_info *table; | |
770 | ||
771 | /* | |
772 | * Check that the current protocol is the highest enabled version | |
773 | * (according to s->ctx->method, as version negotiation may have changed | |
774 | * s->method). | |
775 | */ | |
776 | if (s->version == s->ctx->method->version) | |
777 | return 1; | |
778 | ||
779 | /* | |
780 | * Apparently we're using a version-flexible SSL_METHOD (not at its | |
781 | * highest protocol version). | |
782 | */ | |
783 | if (s->ctx->method->version == TLS_method()->version) | |
784 | table = tls_version_table; | |
785 | else if (s->ctx->method->version == DTLS_method()->version) | |
786 | table = dtls_version_table; | |
787 | else { | |
788 | /* Unexpected state; fail closed. */ | |
789 | return 0; | |
790 | } | |
791 | ||
792 | for (vent = table; vent->version != 0; ++vent) { | |
a230b26e | 793 | if (vent->smeth != NULL && ssl_method_error(s, vent->smeth()) == 0) |
4fa52141 VD |
794 | return s->version == vent->version; |
795 | } | |
796 | return 0; | |
797 | } | |
798 | ||
799 | /* | |
800 | * ssl_set_version_bound - set an upper or lower bound on the supported (D)TLS | |
801 | * protocols, provided the initial (D)TLS method is version-flexible. This | |
802 | * function sanity-checks the proposed value and makes sure the method is | |
803 | * version-flexible, then sets the limit if all is well. | |
804 | * | |
805 | * @method_version: The version of the current SSL_METHOD. | |
806 | * @version: the intended limit. | |
807 | * @bound: pointer to limit to be updated. | |
808 | * | |
809 | * Returns 1 on success, 0 on failure. | |
810 | */ | |
811 | int ssl_set_version_bound(int method_version, int version, int *bound) | |
812 | { | |
869e978c KR |
813 | if (version == 0) { |
814 | *bound = version; | |
815 | return 1; | |
816 | } | |
817 | ||
4fa52141 VD |
818 | /*- |
819 | * Restrict TLS methods to TLS protocol versions. | |
820 | * Restrict DTLS methods to DTLS protocol versions. | |
821 | * Note, DTLS version numbers are decreasing, use comparison macros. | |
822 | * | |
823 | * Note that for both lower-bounds we use explicit versions, not | |
824 | * (D)TLS_MIN_VERSION. This is because we don't want to break user | |
825 | * configurations. If the MIN (supported) version ever rises, the user's | |
826 | * "floor" remains valid even if no longer available. We don't expect the | |
827 | * MAX ceiling to ever get lower, so making that variable makes sense. | |
828 | */ | |
829 | switch (method_version) { | |
830 | default: | |
831 | /* | |
832 | * XXX For fixed version methods, should we always fail and not set any | |
833 | * bounds, always succeed and not set any bounds, or set the bounds and | |
834 | * arrange to fail later if they are not met? At present fixed-version | |
835 | * methods are not subject to controls that disable individual protocol | |
836 | * versions. | |
837 | */ | |
838 | return 0; | |
839 | ||
840 | case TLS_ANY_VERSION: | |
841 | if (version < SSL3_VERSION || version > TLS_MAX_VERSION) | |
842 | return 0; | |
843 | break; | |
844 | ||
845 | case DTLS_ANY_VERSION: | |
846 | if (DTLS_VERSION_GT(version, DTLS_MAX_VERSION) || | |
032924c4 | 847 | DTLS_VERSION_LT(version, DTLS1_BAD_VER)) |
4fa52141 VD |
848 | return 0; |
849 | break; | |
850 | } | |
851 | ||
852 | *bound = version; | |
853 | return 1; | |
854 | } | |
855 | ||
856 | /* | |
857 | * ssl_choose_server_version - Choose server (D)TLS version. Called when the | |
858 | * client HELLO is received to select the final server protocol version and | |
859 | * the version specific method. | |
860 | * | |
861 | * @s: server SSL handle. | |
862 | * | |
863 | * Returns 0 on success or an SSL error reason number on failure. | |
864 | */ | |
865 | int ssl_choose_server_version(SSL *s) | |
866 | { | |
867 | /*- | |
868 | * With version-flexible methods we have an initial state with: | |
869 | * | |
870 | * s->method->version == (D)TLS_ANY_VERSION, | |
871 | * s->version == (D)TLS_MAX_VERSION. | |
872 | * | |
873 | * So we detect version-flexible methods via the method version, not the | |
874 | * handle version. | |
875 | */ | |
876 | int server_version = s->method->version; | |
877 | int client_version = s->client_version; | |
878 | const version_info *vent; | |
879 | const version_info *table; | |
880 | int disabled = 0; | |
881 | ||
882 | switch (server_version) { | |
883 | default: | |
884 | if (version_cmp(s, client_version, s->version) < 0) | |
885 | return SSL_R_WRONG_SSL_VERSION; | |
886 | /* | |
887 | * If this SSL handle is not from a version flexible method we don't | |
888 | * (and never did) check min/max FIPS or Suite B constraints. Hope | |
889 | * that's OK. It is up to the caller to not choose fixed protocol | |
890 | * versions they don't want. If not, then easy to fix, just return | |
891 | * ssl_method_error(s, s->method) | |
892 | */ | |
893 | return 0; | |
894 | case TLS_ANY_VERSION: | |
895 | table = tls_version_table; | |
896 | break; | |
897 | case DTLS_ANY_VERSION: | |
898 | table = dtls_version_table; | |
899 | break; | |
900 | } | |
901 | ||
902 | for (vent = table; vent->version != 0; ++vent) { | |
903 | const SSL_METHOD *method; | |
904 | ||
905 | if (vent->smeth == NULL || | |
906 | version_cmp(s, client_version, vent->version) < 0) | |
907 | continue; | |
908 | method = vent->smeth(); | |
909 | if (ssl_method_error(s, method) == 0) { | |
910 | s->version = vent->version; | |
911 | s->method = method; | |
912 | return 0; | |
913 | } | |
914 | disabled = 1; | |
915 | } | |
916 | return disabled ? SSL_R_UNSUPPORTED_PROTOCOL : SSL_R_VERSION_TOO_LOW; | |
917 | } | |
918 | ||
919 | /* | |
920 | * ssl_choose_client_version - Choose client (D)TLS version. Called when the | |
921 | * server HELLO is received to select the final client protocol version and | |
922 | * the version specific method. | |
923 | * | |
924 | * @s: client SSL handle. | |
925 | * @version: The proposed version from the server's HELLO. | |
926 | * | |
927 | * Returns 0 on success or an SSL error reason number on failure. | |
928 | */ | |
929 | int ssl_choose_client_version(SSL *s, int version) | |
930 | { | |
931 | const version_info *vent; | |
932 | const version_info *table; | |
933 | ||
934 | switch (s->method->version) { | |
935 | default: | |
936 | if (version != s->version) | |
937 | return SSL_R_WRONG_SSL_VERSION; | |
938 | /* | |
939 | * If this SSL handle is not from a version flexible method we don't | |
940 | * (and never did) check min/max, FIPS or Suite B constraints. Hope | |
941 | * that's OK. It is up to the caller to not choose fixed protocol | |
942 | * versions they don't want. If not, then easy to fix, just return | |
943 | * ssl_method_error(s, s->method) | |
944 | */ | |
4fa52141 VD |
945 | return 0; |
946 | case TLS_ANY_VERSION: | |
947 | table = tls_version_table; | |
948 | break; | |
949 | case DTLS_ANY_VERSION: | |
950 | table = dtls_version_table; | |
951 | break; | |
952 | } | |
953 | ||
954 | for (vent = table; vent->version != 0; ++vent) { | |
955 | const SSL_METHOD *method; | |
956 | int err; | |
957 | ||
958 | if (version != vent->version) | |
959 | continue; | |
960 | if (vent->cmeth == NULL) | |
961 | break; | |
962 | method = vent->cmeth(); | |
963 | err = ssl_method_error(s, method); | |
964 | if (err != 0) | |
965 | return err; | |
966 | s->method = method; | |
ccae4a15 | 967 | s->version = version; |
4fa52141 VD |
968 | return 0; |
969 | } | |
970 | ||
971 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
972 | } | |
973 | ||
068c358a KR |
974 | /* |
975 | * ssl_get_client_min_max_version - get minimum and maximum client version | |
976 | * @s: The SSL connection | |
977 | * @min_version: The minimum supported version | |
978 | * @max_version: The maximum supported version | |
979 | * | |
980 | * Work out what version we should be using for the initial ClientHello if the | |
981 | * version is initially (D)TLS_ANY_VERSION. We apply any explicit SSL_OP_NO_xxx | |
982 | * options, the MinProtocol and MaxProtocol configuration commands, any Suite B | |
983 | * or FIPS_mode() constraints and any floor imposed by the security level here, | |
984 | * so we don't advertise the wrong protocol version to only reject the outcome later. | |
4fa52141 | 985 | * |
0485d540 | 986 | * Computing the right floor matters. If, e.g., TLS 1.0 and 1.2 are enabled, |
4fa52141 VD |
987 | * TLS 1.1 is disabled, but the security level, Suite-B and/or MinProtocol |
988 | * only allow TLS 1.2, we want to advertise TLS1.2, *not* TLS1. | |
989 | * | |
068c358a KR |
990 | * Returns 0 on success or an SSL error reason number on failure. On failure |
991 | * min_version and max_version will also be set to 0. | |
4fa52141 | 992 | */ |
a230b26e EK |
993 | int ssl_get_client_min_max_version(const SSL *s, int *min_version, |
994 | int *max_version) | |
4fa52141 VD |
995 | { |
996 | int version; | |
997 | int hole; | |
998 | const SSL_METHOD *single = NULL; | |
999 | const SSL_METHOD *method; | |
1000 | const version_info *table; | |
1001 | const version_info *vent; | |
1002 | ||
1003 | switch (s->method->version) { | |
1004 | default: | |
1005 | /* | |
1006 | * If this SSL handle is not from a version flexible method we don't | |
1007 | * (and never did) check min/max FIPS or Suite B constraints. Hope | |
1008 | * that's OK. It is up to the caller to not choose fixed protocol | |
1009 | * versions they don't want. If not, then easy to fix, just return | |
1010 | * ssl_method_error(s, s->method) | |
1011 | */ | |
068c358a | 1012 | *min_version = *max_version = s->version; |
4fa52141 VD |
1013 | return 0; |
1014 | case TLS_ANY_VERSION: | |
1015 | table = tls_version_table; | |
1016 | break; | |
1017 | case DTLS_ANY_VERSION: | |
1018 | table = dtls_version_table; | |
1019 | break; | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * SSL_OP_NO_X disables all protocols above X *if* there are some protocols | |
1024 | * below X enabled. This is required in order to maintain the "version | |
1025 | * capability" vector contiguous. Any versions with a NULL client method | |
1026 | * (protocol version client is disabled at compile-time) is also a "hole". | |
1027 | * | |
1028 | * Our initial state is hole == 1, version == 0. That is, versions above | |
1029 | * the first version in the method table are disabled (a "hole" above | |
1030 | * the valid protocol entries) and we don't have a selected version yet. | |
1031 | * | |
1032 | * Whenever "hole == 1", and we hit an enabled method, its version becomes | |
1033 | * the selected version, and the method becomes a candidate "single" | |
1034 | * method. We're no longer in a hole, so "hole" becomes 0. | |
1035 | * | |
1036 | * If "hole == 0" and we hit an enabled method, then "single" is cleared, | |
1037 | * as we support a contiguous range of at least two methods. If we hit | |
1038 | * a disabled method, then hole becomes true again, but nothing else | |
1039 | * changes yet, because all the remaining methods may be disabled too. | |
1040 | * If we again hit an enabled method after the new hole, it becomes | |
1041 | * selected, as we start from scratch. | |
1042 | */ | |
068c358a | 1043 | *min_version = version = 0; |
4fa52141 VD |
1044 | hole = 1; |
1045 | for (vent = table; vent->version != 0; ++vent) { | |
1046 | /* | |
1047 | * A table entry with a NULL client method is still a hole in the | |
1048 | * "version capability" vector. | |
1049 | */ | |
1050 | if (vent->cmeth == NULL) { | |
1051 | hole = 1; | |
1052 | continue; | |
1053 | } | |
1054 | method = vent->cmeth(); | |
1055 | if (ssl_method_error(s, method) != 0) { | |
1056 | hole = 1; | |
1057 | } else if (!hole) { | |
1058 | single = NULL; | |
068c358a | 1059 | *min_version = method->version; |
4fa52141 VD |
1060 | } else { |
1061 | version = (single = method)->version; | |
068c358a | 1062 | *min_version = version; |
4fa52141 VD |
1063 | hole = 0; |
1064 | } | |
1065 | } | |
1066 | ||
068c358a KR |
1067 | *max_version = version; |
1068 | ||
4fa52141 VD |
1069 | /* Fail if everything is disabled */ |
1070 | if (version == 0) | |
1071 | return SSL_R_NO_PROTOCOLS_AVAILABLE; | |
1072 | ||
068c358a KR |
1073 | return 0; |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * ssl_set_client_hello_version - Work out what version we should be using for | |
1078 | * the initial ClientHello. | |
1079 | * | |
1080 | * @s: client SSL handle. | |
1081 | * | |
1082 | * Returns 0 on success or an SSL error reason number on failure. | |
1083 | */ | |
1084 | int ssl_set_client_hello_version(SSL *s) | |
1085 | { | |
3eb2aff4 | 1086 | int ver_min, ver_max, ret; |
068c358a | 1087 | |
3eb2aff4 | 1088 | ret = ssl_get_client_min_max_version(s, &ver_min, &ver_max); |
068c358a KR |
1089 | |
1090 | if (ret != 0) | |
1091 | return ret; | |
1092 | ||
3eb2aff4 | 1093 | s->client_version = s->version = ver_max; |
4fa52141 VD |
1094 | return 0; |
1095 | } |