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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 | ||
1f5b44e9 MC |
75 | int tls_setup_handshake(SSL *s) |
76 | { | |
c7f47786 MC |
77 | if (!ssl3_init_finished_mac(s)) |
78 | return 0; | |
79 | ||
80 | if (s->server) { | |
81 | if (SSL_IS_FIRST_HANDSHAKE(s)) { | |
82 | s->ctx->stats.sess_accept++; | |
83 | } else if (!s->s3->send_connection_binding && | |
84 | !(s->options & | |
85 | SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) { | |
86 | /* | |
87 | * Server attempting to renegotiate with client that doesn't | |
88 | * support secure renegotiation. | |
89 | */ | |
90 | SSLerr(SSL_F_TLS_SETUP_HANDSHAKE, | |
91 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); | |
92 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); | |
93 | return 0; | |
94 | } else { | |
95 | s->ctx->stats.sess_accept_renegotiate++; | |
96 | ||
97 | s->s3->tmp.cert_request = 0; | |
98 | } | |
99 | } else { | |
100 | if (SSL_IS_FIRST_HANDSHAKE(s)) | |
101 | s->ctx->stats.sess_connect++; | |
102 | else | |
103 | s->ctx->stats.sess_connect_renegotiate++; | |
104 | ||
105 | /* mark client_random uninitialized */ | |
106 | memset(s->s3->client_random, 0, sizeof(s->s3->client_random)); | |
107 | s->hit = 0; | |
108 | ||
109 | s->s3->tmp.cert_req = 0; | |
110 | ||
1f5b44e9 | 111 | if (SSL_IS_DTLS(s)) |
c7f47786 | 112 | s->statem.use_timer = 1; |
c7f47786 MC |
113 | } |
114 | ||
115 | return 1; | |
116 | } | |
117 | ||
2c5dfdc3 MC |
118 | /* |
119 | * Size of the to-be-signed TLS13 data, without the hash size itself: | |
120 | * 64 bytes of value 32, 33 context bytes, 1 byte separator | |
121 | */ | |
122 | #define TLS13_TBS_START_SIZE 64 | |
123 | #define TLS13_TBS_PREAMBLE_SIZE (TLS13_TBS_START_SIZE + 33 + 1) | |
124 | ||
125 | static int get_cert_verify_tbs_data(SSL *s, unsigned char *tls13tbs, | |
126 | void **hdata, size_t *hdatalen) | |
127 | { | |
128 | static const char *servercontext = "TLS 1.3, server CertificateVerify"; | |
129 | static const char *clientcontext = "TLS 1.3, client CertificateVerify"; | |
130 | ||
131 | if (SSL_IS_TLS13(s)) { | |
132 | size_t hashlen; | |
133 | ||
134 | /* Set the first 64 bytes of to-be-signed data to octet 32 */ | |
135 | memset(tls13tbs, 32, TLS13_TBS_START_SIZE); | |
136 | /* This copies the 33 bytes of context plus the 0 separator byte */ | |
137 | if (s->statem.hand_state == TLS_ST_CR_CERT_VRFY | |
138 | || s->statem.hand_state == TLS_ST_SW_CERT_VRFY) | |
139 | strcpy((char *)tls13tbs + TLS13_TBS_START_SIZE, servercontext); | |
140 | else | |
141 | strcpy((char *)tls13tbs + TLS13_TBS_START_SIZE, clientcontext); | |
142 | ||
143 | /* | |
144 | * If we're currently reading then we need to use the saved handshake | |
145 | * hash value. We can't use the current handshake hash state because | |
146 | * that includes the CertVerify itself. | |
147 | */ | |
148 | if (s->statem.hand_state == TLS_ST_CR_CERT_VRFY | |
149 | || s->statem.hand_state == TLS_ST_SR_CERT_VRFY) { | |
150 | memcpy(tls13tbs + TLS13_TBS_PREAMBLE_SIZE, s->cert_verify_hash, | |
151 | s->cert_verify_hash_len); | |
152 | hashlen = s->cert_verify_hash_len; | |
153 | } else if (!ssl_handshake_hash(s, tls13tbs + TLS13_TBS_PREAMBLE_SIZE, | |
154 | EVP_MAX_MD_SIZE, &hashlen)) { | |
155 | return 0; | |
156 | } | |
157 | ||
158 | *hdata = tls13tbs; | |
159 | *hdatalen = TLS13_TBS_PREAMBLE_SIZE + hashlen; | |
160 | } else { | |
161 | size_t retlen; | |
162 | ||
163 | retlen = BIO_get_mem_data(s->s3->handshake_buffer, hdata); | |
164 | if (retlen <= 0) | |
165 | return 0; | |
166 | *hdatalen = retlen; | |
167 | } | |
168 | ||
169 | return 1; | |
170 | } | |
171 | ||
d8bc1399 MC |
172 | int tls_construct_cert_verify(SSL *s, WPACKET *pkt) |
173 | { | |
e66b9395 DSH |
174 | EVP_PKEY *pkey = s->cert->key->privatekey; |
175 | const EVP_MD *md = s->s3->tmp.md[s->cert->key - s->cert->pkeys]; | |
d8bc1399 | 176 | EVP_MD_CTX *mctx = NULL; |
5f9b64a2 MC |
177 | EVP_PKEY_CTX *pctx = NULL; |
178 | size_t hdatalen = 0, siglen = 0; | |
d8bc1399 MC |
179 | void *hdata; |
180 | unsigned char *sig = NULL; | |
2c5dfdc3 | 181 | unsigned char tls13tbs[TLS13_TBS_PREAMBLE_SIZE + EVP_MAX_MD_SIZE]; |
fe3066ee | 182 | int pktype, ispss = 0; |
2c5dfdc3 | 183 | |
5f9b64a2 | 184 | pktype = EVP_PKEY_id(pkey); |
d8bc1399 MC |
185 | |
186 | mctx = EVP_MD_CTX_new(); | |
187 | if (mctx == NULL) { | |
188 | SSLerr(SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
189 | goto err; | |
190 | } | |
d8bc1399 | 191 | |
2c5dfdc3 MC |
192 | /* Get the data to be signed */ |
193 | if (!get_cert_verify_tbs_data(s, tls13tbs, &hdata, &hdatalen)) { | |
d8bc1399 MC |
194 | SSLerr(SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_INTERNAL_ERROR); |
195 | goto err; | |
196 | } | |
197 | ||
fe3066ee | 198 | if (SSL_USE_SIGALGS(s) && !tls12_get_sigandhash(s, pkt, pkey, md, &ispss)) { |
d8bc1399 MC |
199 | SSLerr(SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_INTERNAL_ERROR); |
200 | goto err; | |
201 | } | |
202 | #ifdef SSL_DEBUG | |
203 | fprintf(stderr, "Using client alg %s\n", EVP_MD_name(md)); | |
204 | #endif | |
5f9b64a2 MC |
205 | siglen = EVP_PKEY_size(pkey); |
206 | sig = OPENSSL_malloc(siglen); | |
d8bc1399 MC |
207 | if (sig == NULL) { |
208 | SSLerr(SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
209 | goto err; | |
210 | } | |
5f9b64a2 MC |
211 | |
212 | if (EVP_DigestSignInit(mctx, &pctx, md, NULL, pkey) <= 0 | |
213 | || EVP_DigestSignUpdate(mctx, hdata, hdatalen) <= 0) { | |
214 | SSLerr(SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_EVP_LIB); | |
215 | goto err; | |
216 | } | |
217 | ||
fe3066ee | 218 | if (ispss) { |
5f9b64a2 | 219 | if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0 |
968ae5b3 DSH |
220 | || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, |
221 | RSA_PSS_SALTLEN_DIGEST) <= 0) { | |
5f9b64a2 MC |
222 | SSLerr(SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_EVP_LIB); |
223 | goto err; | |
224 | } | |
225 | } else if (s->version == SSL3_VERSION) { | |
226 | if (!EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET, | |
227 | (int)s->session->master_key_length, | |
228 | s->session->master_key)) { | |
229 | SSLerr(SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_EVP_LIB); | |
230 | goto err; | |
231 | } | |
232 | } | |
233 | ||
234 | if (EVP_DigestSignFinal(mctx, sig, &siglen) <= 0) { | |
d8bc1399 MC |
235 | SSLerr(SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_EVP_LIB); |
236 | goto err; | |
237 | } | |
5f9b64a2 | 238 | |
d8bc1399 MC |
239 | #ifndef OPENSSL_NO_GOST |
240 | { | |
d8bc1399 MC |
241 | if (pktype == NID_id_GostR3410_2001 |
242 | || pktype == NID_id_GostR3410_2012_256 | |
243 | || pktype == NID_id_GostR3410_2012_512) | |
5f9b64a2 | 244 | BUF_reverse(sig, NULL, siglen); |
d8bc1399 MC |
245 | } |
246 | #endif | |
247 | ||
5f9b64a2 | 248 | if (!WPACKET_sub_memcpy_u16(pkt, sig, siglen)) { |
d8bc1399 MC |
249 | SSLerr(SSL_F_TLS_CONSTRUCT_CERT_VERIFY, ERR_R_INTERNAL_ERROR); |
250 | goto err; | |
251 | } | |
252 | ||
253 | /* Digest cached records and discard handshake buffer */ | |
254 | if (!ssl3_digest_cached_records(s, 0)) | |
255 | goto err; | |
256 | ||
257 | OPENSSL_free(sig); | |
258 | EVP_MD_CTX_free(mctx); | |
259 | return 1; | |
260 | err: | |
261 | OPENSSL_free(sig); | |
262 | EVP_MD_CTX_free(mctx); | |
263 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
264 | return 0; | |
265 | } | |
266 | ||
267 | MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt) | |
268 | { | |
269 | EVP_PKEY *pkey = NULL; | |
703bcee0 | 270 | const unsigned char *data; |
d8bc1399 MC |
271 | #ifndef OPENSSL_NO_GOST |
272 | unsigned char *gost_data = NULL; | |
273 | #endif | |
5f9b64a2 | 274 | int al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR; |
5554facb | 275 | int type = 0, j, pktype; |
d8bc1399 MC |
276 | unsigned int len; |
277 | X509 *peer; | |
278 | const EVP_MD *md = NULL; | |
2c5dfdc3 | 279 | size_t hdatalen = 0; |
d8bc1399 | 280 | void *hdata; |
2c5dfdc3 | 281 | unsigned char tls13tbs[TLS13_TBS_PREAMBLE_SIZE + EVP_MAX_MD_SIZE]; |
d8bc1399 | 282 | EVP_MD_CTX *mctx = EVP_MD_CTX_new(); |
5f9b64a2 | 283 | EVP_PKEY_CTX *pctx = NULL; |
d8bc1399 MC |
284 | |
285 | if (mctx == NULL) { | |
286 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
d8bc1399 MC |
287 | goto f_err; |
288 | } | |
289 | ||
290 | peer = s->session->peer; | |
291 | pkey = X509_get0_pubkey(peer); | |
83b4049a BE |
292 | if (pkey == NULL) { |
293 | al = SSL_AD_INTERNAL_ERROR; | |
294 | goto f_err; | |
295 | } | |
296 | ||
5f9b64a2 | 297 | pktype = EVP_PKEY_id(pkey); |
d8bc1399 MC |
298 | type = X509_certificate_type(peer, pkey); |
299 | ||
300 | if (!(type & EVP_PKT_SIGN)) { | |
301 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, | |
302 | SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); | |
303 | al = SSL_AD_ILLEGAL_PARAMETER; | |
304 | goto f_err; | |
305 | } | |
306 | ||
307 | /* Check for broken implementations of GOST ciphersuites */ | |
308 | /* | |
309 | * If key is GOST and n is exactly 64, it is bare signature without | |
310 | * length field (CryptoPro implementations at least till CSP 4.0) | |
311 | */ | |
312 | #ifndef OPENSSL_NO_GOST | |
313 | if (PACKET_remaining(pkt) == 64 | |
314 | && EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) { | |
315 | len = 64; | |
316 | } else | |
317 | #endif | |
318 | { | |
319 | if (SSL_USE_SIGALGS(s)) { | |
320 | int rv; | |
703bcee0 | 321 | unsigned int sigalg; |
d8bc1399 | 322 | |
703bcee0 | 323 | if (!PACKET_get_net_2(pkt, &sigalg)) { |
d8bc1399 MC |
324 | al = SSL_AD_DECODE_ERROR; |
325 | goto f_err; | |
326 | } | |
5554facb | 327 | rv = tls12_check_peer_sigalg(s, sigalg, pkey); |
d8bc1399 | 328 | if (rv == -1) { |
d8bc1399 MC |
329 | goto f_err; |
330 | } else if (rv == 0) { | |
331 | al = SSL_AD_DECODE_ERROR; | |
332 | goto f_err; | |
333 | } | |
6cbebb55 | 334 | md = ssl_md(s->s3->tmp.peer_sigalg->hash_idx); |
d8bc1399 MC |
335 | #ifdef SSL_DEBUG |
336 | fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); | |
337 | #endif | |
338 | } else { | |
339 | /* Use default digest for this key type */ | |
340 | int idx = ssl_cert_type(NULL, pkey); | |
341 | if (idx >= 0) | |
342 | md = s->s3->tmp.md[idx]; | |
343 | if (md == NULL) { | |
344 | al = SSL_AD_INTERNAL_ERROR; | |
345 | goto f_err; | |
346 | } | |
347 | } | |
348 | ||
349 | if (!PACKET_get_net_2(pkt, &len)) { | |
350 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); | |
351 | al = SSL_AD_DECODE_ERROR; | |
352 | goto f_err; | |
353 | } | |
354 | } | |
355 | j = EVP_PKEY_size(pkey); | |
356 | if (((int)len > j) || ((int)PACKET_remaining(pkt) > j) | |
357 | || (PACKET_remaining(pkt) == 0)) { | |
358 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE); | |
359 | al = SSL_AD_DECODE_ERROR; | |
360 | goto f_err; | |
361 | } | |
362 | if (!PACKET_get_bytes(pkt, &data, len)) { | |
363 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); | |
364 | al = SSL_AD_DECODE_ERROR; | |
365 | goto f_err; | |
366 | } | |
367 | ||
2c5dfdc3 | 368 | if (!get_cert_verify_tbs_data(s, tls13tbs, &hdata, &hdatalen)) { |
d8bc1399 | 369 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); |
d8bc1399 MC |
370 | goto f_err; |
371 | } | |
372 | ||
373 | #ifdef SSL_DEBUG | |
374 | fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md)); | |
375 | #endif | |
5f9b64a2 MC |
376 | if (EVP_DigestVerifyInit(mctx, &pctx, md, NULL, pkey) <= 0 |
377 | || EVP_DigestVerifyUpdate(mctx, hdata, hdatalen) <= 0) { | |
d8bc1399 | 378 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); |
d8bc1399 MC |
379 | goto f_err; |
380 | } | |
381 | #ifndef OPENSSL_NO_GOST | |
382 | { | |
d8bc1399 MC |
383 | if (pktype == NID_id_GostR3410_2001 |
384 | || pktype == NID_id_GostR3410_2012_256 | |
385 | || pktype == NID_id_GostR3410_2012_512) { | |
386 | if ((gost_data = OPENSSL_malloc(len)) == NULL) { | |
387 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
d8bc1399 MC |
388 | goto f_err; |
389 | } | |
390 | BUF_reverse(gost_data, data, len); | |
391 | data = gost_data; | |
392 | } | |
393 | } | |
394 | #endif | |
395 | ||
5554facb | 396 | if (SSL_USE_PSS(s)) { |
5f9b64a2 | 397 | if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0 |
968ae5b3 DSH |
398 | || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, |
399 | RSA_PSS_SALTLEN_DIGEST) <= 0) { | |
5f9b64a2 MC |
400 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); |
401 | goto f_err; | |
402 | } | |
403 | } else if (s->version == SSL3_VERSION | |
d8bc1399 MC |
404 | && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET, |
405 | (int)s->session->master_key_length, | |
406 | s->session->master_key)) { | |
407 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); | |
d8bc1399 MC |
408 | goto f_err; |
409 | } | |
410 | ||
5f9b64a2 | 411 | if (EVP_DigestVerifyFinal(mctx, data, len) <= 0) { |
d8bc1399 MC |
412 | al = SSL_AD_DECRYPT_ERROR; |
413 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE); | |
414 | goto f_err; | |
415 | } | |
416 | ||
2c5dfdc3 MC |
417 | if (SSL_IS_TLS13(s)) |
418 | ret = MSG_PROCESS_CONTINUE_READING; | |
419 | else | |
420 | ret = MSG_PROCESS_CONTINUE_PROCESSING; | |
d8bc1399 MC |
421 | if (0) { |
422 | f_err: | |
423 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
424 | ossl_statem_set_error(s); | |
425 | } | |
426 | BIO_free(s->s3->handshake_buffer); | |
427 | s->s3->handshake_buffer = NULL; | |
428 | EVP_MD_CTX_free(mctx); | |
429 | #ifndef OPENSSL_NO_GOST | |
430 | OPENSSL_free(gost_data); | |
431 | #endif | |
432 | return ret; | |
433 | } | |
434 | ||
229185e6 | 435 | int tls_construct_finished(SSL *s, WPACKET *pkt) |
0f113f3e | 436 | { |
12472b45 | 437 | size_t finish_md_len; |
229185e6 | 438 | const char *sender; |
8b0e934a | 439 | size_t slen; |
229185e6 MC |
440 | |
441 | if (s->server) { | |
442 | sender = s->method->ssl3_enc->server_finished_label; | |
443 | slen = s->method->ssl3_enc->server_finished_label_len; | |
444 | } else { | |
445 | sender = s->method->ssl3_enc->client_finished_label; | |
446 | slen = s->method->ssl3_enc->client_finished_label_len; | |
447 | } | |
0f113f3e | 448 | |
12472b45 MC |
449 | finish_md_len = s->method->ssl3_enc->final_finish_mac(s, |
450 | sender, slen, | |
451 | s->s3->tmp.finish_md); | |
452 | if (finish_md_len == 0) { | |
4f89bfbf MC |
453 | SSLerr(SSL_F_TLS_CONSTRUCT_FINISHED, ERR_R_INTERNAL_ERROR); |
454 | goto err; | |
455 | } | |
456 | ||
12472b45 | 457 | s->s3->tmp.finish_md_len = finish_md_len; |
4f89bfbf | 458 | |
12472b45 | 459 | if (!WPACKET_memcpy(pkt, s->s3->tmp.finish_md, finish_md_len)) { |
4f89bfbf MC |
460 | SSLerr(SSL_F_TLS_CONSTRUCT_FINISHED, ERR_R_INTERNAL_ERROR); |
461 | goto err; | |
462 | } | |
0f113f3e | 463 | |
2c7bd692 CB |
464 | /* |
465 | * Log the master secret, if logging is enabled. We don't log it for | |
466 | * TLSv1.3: there's a different key schedule for that. | |
467 | */ | |
468 | if (!SSL_IS_TLS13(s) && !ssl_log_secret(s, MASTER_SECRET_LABEL, | |
469 | s->session->master_key, | |
470 | s->session->master_key_length)) | |
2faa1b48 CB |
471 | return 0; |
472 | ||
b9908bf9 MC |
473 | /* |
474 | * Copy the finished so we can use it for renegotiation checks | |
475 | */ | |
23a635c0 | 476 | if (!s->server) { |
12472b45 MC |
477 | OPENSSL_assert(finish_md_len <= EVP_MAX_MD_SIZE); |
478 | memcpy(s->s3->previous_client_finished, s->s3->tmp.finish_md, | |
479 | finish_md_len); | |
480 | s->s3->previous_client_finished_len = finish_md_len; | |
b9908bf9 | 481 | } else { |
12472b45 MC |
482 | OPENSSL_assert(finish_md_len <= EVP_MAX_MD_SIZE); |
483 | memcpy(s->s3->previous_server_finished, s->s3->tmp.finish_md, | |
484 | finish_md_len); | |
485 | s->s3->previous_server_finished_len = finish_md_len; | |
b9908bf9 | 486 | } |
0f113f3e | 487 | |
b9908bf9 | 488 | return 1; |
4f89bfbf | 489 | err: |
4f89bfbf MC |
490 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
491 | return 0; | |
0f113f3e | 492 | } |
d02b48c6 | 493 | |
bf48836c | 494 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
495 | /* |
496 | * ssl3_take_mac calculates the Finished MAC for the handshakes messages seen | |
497 | * to far. | |
498 | */ | |
ee2ffc27 | 499 | static void ssl3_take_mac(SSL *s) |
0f113f3e MC |
500 | { |
501 | const char *sender; | |
8b0e934a | 502 | size_t slen; |
0f113f3e MC |
503 | /* |
504 | * If no new cipher setup return immediately: other functions will set | |
505 | * the appropriate error. | |
506 | */ | |
507 | if (s->s3->tmp.new_cipher == NULL) | |
508 | return; | |
49ae7423 | 509 | if (!s->server) { |
0f113f3e MC |
510 | sender = s->method->ssl3_enc->server_finished_label; |
511 | slen = s->method->ssl3_enc->server_finished_label_len; | |
512 | } else { | |
513 | sender = s->method->ssl3_enc->client_finished_label; | |
514 | slen = s->method->ssl3_enc->client_finished_label_len; | |
515 | } | |
516 | ||
517 | s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s, | |
518 | sender, | |
519 | slen, | |
520 | s->s3->tmp.peer_finish_md); | |
521 | } | |
ee2ffc27 BL |
522 | #endif |
523 | ||
be3583fa | 524 | MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt) |
b9908bf9 MC |
525 | { |
526 | int al; | |
348240c6 | 527 | size_t remain; |
4fa52141 | 528 | |
73999b62 | 529 | remain = PACKET_remaining(pkt); |
657da85e MC |
530 | /* |
531 | * 'Change Cipher Spec' is just a single byte, which should already have | |
c69f2adf MC |
532 | * been consumed by ssl_get_message() so there should be no bytes left, |
533 | * unless we're using DTLS1_BAD_VER, which has an extra 2 bytes | |
657da85e | 534 | */ |
c69f2adf | 535 | if (SSL_IS_DTLS(s)) { |
73999b62 | 536 | if ((s->version == DTLS1_BAD_VER |
a230b26e EK |
537 | && remain != DTLS1_CCS_HEADER_LENGTH + 1) |
538 | || (s->version != DTLS1_BAD_VER | |
539 | && remain != DTLS1_CCS_HEADER_LENGTH - 1)) { | |
540 | al = SSL_AD_ILLEGAL_PARAMETER; | |
541 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, | |
542 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
543 | goto f_err; | |
c69f2adf MC |
544 | } |
545 | } else { | |
73999b62 | 546 | if (remain != 0) { |
c69f2adf | 547 | al = SSL_AD_ILLEGAL_PARAMETER; |
b9908bf9 MC |
548 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, |
549 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
c69f2adf MC |
550 | goto f_err; |
551 | } | |
657da85e MC |
552 | } |
553 | ||
554 | /* Check we have a cipher to change to */ | |
555 | if (s->s3->tmp.new_cipher == NULL) { | |
556 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
b9908bf9 | 557 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, SSL_R_CCS_RECEIVED_EARLY); |
657da85e MC |
558 | goto f_err; |
559 | } | |
560 | ||
561 | s->s3->change_cipher_spec = 1; | |
562 | if (!ssl3_do_change_cipher_spec(s)) { | |
563 | al = SSL_AD_INTERNAL_ERROR; | |
b9908bf9 | 564 | SSLerr(SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); |
657da85e MC |
565 | goto f_err; |
566 | } | |
567 | ||
c69f2adf MC |
568 | if (SSL_IS_DTLS(s)) { |
569 | dtls1_reset_seq_numbers(s, SSL3_CC_READ); | |
570 | ||
571 | if (s->version == DTLS1_BAD_VER) | |
572 | s->d1->handshake_read_seq++; | |
573 | ||
574 | #ifndef OPENSSL_NO_SCTP | |
575 | /* | |
576 | * Remember that a CCS has been received, so that an old key of | |
577 | * SCTP-Auth can be deleted when a CCS is sent. Will be ignored if no | |
578 | * SCTP is used | |
579 | */ | |
580 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL); | |
581 | #endif | |
582 | } | |
583 | ||
b9908bf9 | 584 | return MSG_PROCESS_CONTINUE_READING; |
657da85e MC |
585 | f_err: |
586 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 587 | ossl_statem_set_error(s); |
b9908bf9 | 588 | return MSG_PROCESS_ERROR; |
657da85e MC |
589 | } |
590 | ||
be3583fa | 591 | MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt) |
b9908bf9 | 592 | { |
7776a36c | 593 | int al = SSL_AD_INTERNAL_ERROR; |
12472b45 | 594 | size_t md_len; |
b9908bf9 | 595 | |
0f113f3e | 596 | /* If this occurs, we have missed a message */ |
92760c21 | 597 | if (!SSL_IS_TLS13(s) && !s->s3->change_cipher_spec) { |
0f113f3e | 598 | al = SSL_AD_UNEXPECTED_MESSAGE; |
b9908bf9 | 599 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_GOT_A_FIN_BEFORE_A_CCS); |
0f113f3e MC |
600 | goto f_err; |
601 | } | |
602 | s->s3->change_cipher_spec = 0; | |
603 | ||
12472b45 | 604 | md_len = s->s3->tmp.peer_finish_md_len; |
0f113f3e | 605 | |
12472b45 | 606 | if (md_len != PACKET_remaining(pkt)) { |
0f113f3e | 607 | al = SSL_AD_DECODE_ERROR; |
b9908bf9 | 608 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_BAD_DIGEST_LENGTH); |
0f113f3e MC |
609 | goto f_err; |
610 | } | |
611 | ||
12472b45 MC |
612 | if (CRYPTO_memcmp(PACKET_data(pkt), s->s3->tmp.peer_finish_md, |
613 | md_len) != 0) { | |
0f113f3e | 614 | al = SSL_AD_DECRYPT_ERROR; |
b9908bf9 | 615 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_DIGEST_CHECK_FAILED); |
0f113f3e MC |
616 | goto f_err; |
617 | } | |
618 | ||
619 | /* | |
620 | * Copy the finished so we can use it for renegotiation checks | |
621 | */ | |
23a635c0 | 622 | if (s->server) { |
12472b45 MC |
623 | OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE); |
624 | memcpy(s->s3->previous_client_finished, s->s3->tmp.peer_finish_md, | |
625 | md_len); | |
626 | s->s3->previous_client_finished_len = md_len; | |
0f113f3e | 627 | } else { |
12472b45 MC |
628 | OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE); |
629 | memcpy(s->s3->previous_server_finished, s->s3->tmp.peer_finish_md, | |
630 | md_len); | |
631 | s->s3->previous_server_finished_len = md_len; | |
0f113f3e MC |
632 | } |
633 | ||
7776a36c MC |
634 | /* |
635 | * In TLS1.3 we also have to change cipher state and do any final processing | |
636 | * of the initial server flight (if we are a client) | |
637 | */ | |
92760c21 MC |
638 | if (SSL_IS_TLS13(s)) { |
639 | if (s->server) { | |
640 | if (!s->method->ssl3_enc->change_cipher_state(s, | |
641 | SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_READ)) { | |
92760c21 MC |
642 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_CANNOT_CHANGE_CIPHER); |
643 | goto f_err; | |
644 | } | |
645 | } else { | |
646 | if (!s->method->ssl3_enc->generate_master_secret(s, | |
ec15acb6 | 647 | s->master_secret, s->handshake_secret, 0, |
92760c21 | 648 | &s->session->master_key_length)) { |
92760c21 MC |
649 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_CANNOT_CHANGE_CIPHER); |
650 | goto f_err; | |
651 | } | |
652 | if (!s->method->ssl3_enc->change_cipher_state(s, | |
653 | SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_CLIENT_READ)) { | |
92760c21 MC |
654 | SSLerr(SSL_F_TLS_PROCESS_FINISHED, SSL_R_CANNOT_CHANGE_CIPHER); |
655 | goto f_err; | |
656 | } | |
7776a36c MC |
657 | if (!tls_process_initial_server_flight(s, &al)) |
658 | goto f_err; | |
92760c21 MC |
659 | } |
660 | } | |
661 | ||
e6575156 | 662 | return MSG_PROCESS_FINISHED_READING; |
0f113f3e MC |
663 | f_err: |
664 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 665 | ossl_statem_set_error(s); |
b9908bf9 | 666 | return MSG_PROCESS_ERROR; |
0f113f3e | 667 | } |
d02b48c6 | 668 | |
7cea05dc | 669 | int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt) |
b9908bf9 | 670 | { |
7cea05dc | 671 | if (!WPACKET_put_bytes_u8(pkt, SSL3_MT_CCS)) { |
3c106325 | 672 | SSLerr(SSL_F_TLS_CONSTRUCT_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); |
85a7a5e6 MC |
673 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
674 | return 0; | |
675 | } | |
b9908bf9 | 676 | |
b9908bf9 MC |
677 | return 1; |
678 | } | |
679 | ||
e96e0f8e MC |
680 | /* Add a certificate to the WPACKET */ |
681 | static int ssl_add_cert_to_wpacket(SSL *s, WPACKET *pkt, X509 *x, int chain, | |
682 | int *al) | |
0f113f3e | 683 | { |
e96e0f8e MC |
684 | int len; |
685 | unsigned char *outbytes; | |
686 | ||
687 | len = i2d_X509(x, NULL); | |
688 | if (len < 0) { | |
f63e4288 | 689 | SSLerr(SSL_F_SSL_ADD_CERT_TO_WPACKET, ERR_R_BUF_LIB); |
e96e0f8e MC |
690 | *al = SSL_AD_INTERNAL_ERROR; |
691 | return 0; | |
692 | } | |
693 | if (!WPACKET_sub_allocate_bytes_u24(pkt, len, &outbytes) | |
694 | || i2d_X509(x, &outbytes) != len) { | |
f63e4288 | 695 | SSLerr(SSL_F_SSL_ADD_CERT_TO_WPACKET, ERR_R_INTERNAL_ERROR); |
e96e0f8e MC |
696 | *al = SSL_AD_INTERNAL_ERROR; |
697 | return 0; | |
698 | } | |
699 | ||
700 | if (SSL_IS_TLS13(s) | |
701 | && !tls_construct_extensions(s, pkt, EXT_TLS1_3_CERTIFICATE, x, | |
702 | chain, al)) | |
703 | return 0; | |
704 | ||
705 | return 1; | |
706 | } | |
707 | ||
708 | /* Add certificate chain to provided WPACKET */ | |
709 | static int ssl_add_cert_chain(SSL *s, WPACKET *pkt, CERT_PKEY *cpk, int *al) | |
710 | { | |
711 | int i, chain_count; | |
712 | X509 *x; | |
713 | STACK_OF(X509) *extra_certs; | |
714 | STACK_OF(X509) *chain = NULL; | |
715 | X509_STORE *chain_store; | |
716 | int tmpal = SSL_AD_INTERNAL_ERROR; | |
717 | ||
718 | if (cpk == NULL || cpk->x509 == NULL) | |
719 | return 1; | |
720 | ||
721 | x = cpk->x509; | |
722 | ||
723 | /* | |
724 | * If we have a certificate specific chain use it, else use parent ctx. | |
725 | */ | |
d805a57b | 726 | if (cpk->chain != NULL) |
e96e0f8e MC |
727 | extra_certs = cpk->chain; |
728 | else | |
729 | extra_certs = s->ctx->extra_certs; | |
730 | ||
731 | if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || extra_certs) | |
732 | chain_store = NULL; | |
733 | else if (s->cert->chain_store) | |
734 | chain_store = s->cert->chain_store; | |
735 | else | |
736 | chain_store = s->ctx->cert_store; | |
737 | ||
d805a57b | 738 | if (chain_store != NULL) { |
e96e0f8e MC |
739 | X509_STORE_CTX *xs_ctx = X509_STORE_CTX_new(); |
740 | ||
741 | if (xs_ctx == NULL) { | |
742 | SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_MALLOC_FAILURE); | |
743 | goto err; | |
744 | } | |
745 | if (!X509_STORE_CTX_init(xs_ctx, chain_store, x, NULL)) { | |
746 | X509_STORE_CTX_free(xs_ctx); | |
747 | SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_X509_LIB); | |
748 | goto err; | |
749 | } | |
750 | /* | |
751 | * It is valid for the chain not to be complete (because normally we | |
752 | * don't include the root cert in the chain). Therefore we deliberately | |
753 | * ignore the error return from this call. We're not actually verifying | |
754 | * the cert - we're just building as much of the chain as we can | |
755 | */ | |
756 | (void)X509_verify_cert(xs_ctx); | |
757 | /* Don't leave errors in the queue */ | |
758 | ERR_clear_error(); | |
759 | chain = X509_STORE_CTX_get0_chain(xs_ctx); | |
760 | i = ssl_security_cert_chain(s, chain, NULL, 0); | |
761 | if (i != 1) { | |
762 | #if 0 | |
763 | /* Dummy error calls so mkerr generates them */ | |
764 | SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_EE_KEY_TOO_SMALL); | |
765 | SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_KEY_TOO_SMALL); | |
766 | SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_MD_TOO_WEAK); | |
767 | #endif | |
768 | X509_STORE_CTX_free(xs_ctx); | |
769 | SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, i); | |
770 | goto err; | |
771 | } | |
772 | chain_count = sk_X509_num(chain); | |
773 | for (i = 0; i < chain_count; i++) { | |
774 | x = sk_X509_value(chain, i); | |
775 | ||
776 | if (!ssl_add_cert_to_wpacket(s, pkt, x, i, &tmpal)) { | |
777 | X509_STORE_CTX_free(xs_ctx); | |
778 | goto err; | |
779 | } | |
780 | } | |
781 | X509_STORE_CTX_free(xs_ctx); | |
782 | } else { | |
783 | i = ssl_security_cert_chain(s, extra_certs, x, 0); | |
784 | if (i != 1) { | |
785 | SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, i); | |
786 | goto err; | |
787 | } | |
788 | if (!ssl_add_cert_to_wpacket(s, pkt, x, 0, &tmpal)) | |
789 | goto err; | |
790 | for (i = 0; i < sk_X509_num(extra_certs); i++) { | |
791 | x = sk_X509_value(extra_certs, i); | |
792 | if (!ssl_add_cert_to_wpacket(s, pkt, x, i + 1, &tmpal)) | |
793 | goto err; | |
794 | } | |
795 | } | |
796 | return 1; | |
797 | ||
798 | err: | |
799 | *al = tmpal; | |
800 | return 0; | |
801 | } | |
802 | ||
803 | unsigned long ssl3_output_cert_chain(SSL *s, WPACKET *pkt, CERT_PKEY *cpk, | |
804 | int *al) | |
805 | { | |
806 | int tmpal = SSL_AD_INTERNAL_ERROR; | |
807 | ||
5923ad4b | 808 | if (!WPACKET_start_sub_packet_u24(pkt) |
e96e0f8e | 809 | || !ssl_add_cert_chain(s, pkt, cpk, &tmpal) |
5923ad4b | 810 | || !WPACKET_close(pkt)) { |
c49e1912 | 811 | SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN, ERR_R_INTERNAL_ERROR); |
e96e0f8e | 812 | *al = tmpal; |
7cea05dc | 813 | return 0; |
77d514c5 | 814 | } |
c49e1912 | 815 | return 1; |
0f113f3e MC |
816 | } |
817 | ||
30f05b19 MC |
818 | /* |
819 | * Tidy up after the end of a handshake. In the case of SCTP this may result | |
820 | * in NBIO events. If |clearbufs| is set then init_buf and the wbio buffer is | |
821 | * freed up as well. | |
822 | */ | |
823 | WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst, int clearbufs) | |
8723588e MC |
824 | { |
825 | void (*cb) (const SSL *ssl, int type, int val) = NULL; | |
826 | ||
827 | #ifndef OPENSSL_NO_SCTP | |
828 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) { | |
be3583fa | 829 | WORK_STATE ret; |
8723588e MC |
830 | ret = dtls_wait_for_dry(s); |
831 | if (ret != WORK_FINISHED_CONTINUE) | |
832 | return ret; | |
833 | } | |
834 | #endif | |
835 | ||
30f05b19 MC |
836 | if (clearbufs) { |
837 | if (!SSL_IS_DTLS(s)) { | |
838 | /* | |
839 | * We don't do this in DTLS because we may still need the init_buf | |
840 | * in case there are any unexpected retransmits | |
841 | */ | |
842 | BUF_MEM_free(s->init_buf); | |
843 | s->init_buf = NULL; | |
844 | } | |
845 | ssl_free_wbio_buffer(s); | |
846 | s->init_num = 0; | |
473483d4 | 847 | } |
8723588e | 848 | |
c7f47786 | 849 | if (s->statem.cleanuphand) { |
8723588e MC |
850 | /* skipped if we just sent a HelloRequest */ |
851 | s->renegotiate = 0; | |
852 | s->new_session = 0; | |
c7f47786 | 853 | s->statem.cleanuphand = 0; |
8723588e | 854 | |
30f05b19 MC |
855 | ssl3_cleanup_key_block(s); |
856 | ||
8723588e | 857 | if (s->server) { |
8723588e MC |
858 | ssl_update_cache(s, SSL_SESS_CACHE_SERVER); |
859 | ||
860 | s->ctx->stats.sess_accept_good++; | |
fe3a3291 | 861 | s->handshake_func = ossl_statem_accept; |
8723588e MC |
862 | } else { |
863 | ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); | |
864 | if (s->hit) | |
865 | s->ctx->stats.sess_hit++; | |
866 | ||
fe3a3291 | 867 | s->handshake_func = ossl_statem_connect; |
8723588e MC |
868 | s->ctx->stats.sess_connect_good++; |
869 | } | |
870 | ||
871 | if (s->info_callback != NULL) | |
872 | cb = s->info_callback; | |
873 | else if (s->ctx->info_callback != NULL) | |
874 | cb = s->ctx->info_callback; | |
875 | ||
876 | if (cb != NULL) | |
877 | cb(s, SSL_CB_HANDSHAKE_DONE, 1); | |
878 | ||
879 | if (SSL_IS_DTLS(s)) { | |
880 | /* done with handshaking */ | |
881 | s->d1->handshake_read_seq = 0; | |
882 | s->d1->handshake_write_seq = 0; | |
883 | s->d1->next_handshake_write_seq = 0; | |
f5c7f5df | 884 | dtls1_clear_received_buffer(s); |
8723588e MC |
885 | } |
886 | } | |
887 | ||
30f05b19 MC |
888 | /* |
889 | * If we've not cleared the buffers its because we've got more work to do, | |
890 | * so continue. | |
891 | */ | |
892 | if (!clearbufs) | |
893 | return WORK_FINISHED_CONTINUE; | |
894 | ||
8723588e MC |
895 | return WORK_FINISHED_STOP; |
896 | } | |
897 | ||
9ab930b2 MC |
898 | int tls_get_message_header(SSL *s, int *mt) |
899 | { | |
900 | /* s->init_num < SSL3_HM_HEADER_LENGTH */ | |
901 | int skip_message, i, recvd_type, al; | |
902 | unsigned char *p; | |
54105ddd | 903 | size_t l, readbytes; |
9ab930b2 MC |
904 | |
905 | p = (unsigned char *)s->init_buf->data; | |
906 | ||
907 | do { | |
908 | while (s->init_num < SSL3_HM_HEADER_LENGTH) { | |
909 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &recvd_type, | |
a230b26e EK |
910 | &p[s->init_num], |
911 | SSL3_HM_HEADER_LENGTH - s->init_num, | |
54105ddd | 912 | 0, &readbytes); |
9ab930b2 MC |
913 | if (i <= 0) { |
914 | s->rwstate = SSL_READING; | |
915 | return 0; | |
32ec4153 | 916 | } |
9ab930b2 | 917 | if (recvd_type == SSL3_RT_CHANGE_CIPHER_SPEC) { |
1257adec | 918 | /* |
a230b26e EK |
919 | * A ChangeCipherSpec must be a single byte and may not occur |
920 | * in the middle of a handshake message. | |
921 | */ | |
54105ddd | 922 | if (s->init_num != 0 || readbytes != 1 || p[0] != SSL3_MT_CCS) { |
1257adec DB |
923 | al = SSL_AD_UNEXPECTED_MESSAGE; |
924 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, | |
925 | SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
926 | goto f_err; | |
927 | } | |
9ab930b2 | 928 | s->s3->tmp.message_type = *mt = SSL3_MT_CHANGE_CIPHER_SPEC; |
54105ddd | 929 | s->init_num = readbytes - 1; |
c4377574 | 930 | s->init_msg = s->init_buf->data; |
54105ddd | 931 | s->s3->tmp.message_size = readbytes; |
9ab930b2 MC |
932 | return 1; |
933 | } else if (recvd_type != SSL3_RT_HANDSHAKE) { | |
934 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
935 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_CCS_RECEIVED_EARLY); | |
32ec4153 MC |
936 | goto f_err; |
937 | } | |
54105ddd | 938 | s->init_num += readbytes; |
9ab930b2 MC |
939 | } |
940 | ||
941 | skip_message = 0; | |
942 | if (!s->server) | |
c7f47786 MC |
943 | if (s->statem.hand_state != TLS_ST_OK |
944 | && p[0] == SSL3_MT_HELLO_REQUEST) | |
9ab930b2 MC |
945 | /* |
946 | * The server may always send 'Hello Request' messages -- | |
947 | * we are doing a handshake anyway now, so ignore them if | |
948 | * their format is correct. Does not count for 'Finished' | |
949 | * MAC. | |
950 | */ | |
951 | if (p[1] == 0 && p[2] == 0 && p[3] == 0) { | |
952 | s->init_num = 0; | |
953 | skip_message = 1; | |
954 | ||
955 | if (s->msg_callback) | |
956 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
957 | p, SSL3_HM_HEADER_LENGTH, s, | |
958 | s->msg_callback_arg); | |
959 | } | |
960 | } while (skip_message); | |
961 | /* s->init_num == SSL3_HM_HEADER_LENGTH */ | |
962 | ||
963 | *mt = *p; | |
964 | s->s3->tmp.message_type = *(p++); | |
32ec4153 | 965 | |
e8aa8b6c | 966 | if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { |
9ab930b2 MC |
967 | /* |
968 | * Only happens with SSLv3+ in an SSLv2 backward compatible | |
969 | * ClientHello | |
e8aa8b6c F |
970 | * |
971 | * Total message size is the remaining record bytes to read | |
972 | * plus the SSL3_HM_HEADER_LENGTH bytes that we already read | |
9ab930b2 | 973 | */ |
9ab930b2 MC |
974 | l = RECORD_LAYER_get_rrec_length(&s->rlayer) |
975 | + SSL3_HM_HEADER_LENGTH; | |
9ab930b2 MC |
976 | s->s3->tmp.message_size = l; |
977 | ||
978 | s->init_msg = s->init_buf->data; | |
979 | s->init_num = SSL3_HM_HEADER_LENGTH; | |
980 | } else { | |
981 | n2l3(p, l); | |
982 | /* BUF_MEM_grow takes an 'int' parameter */ | |
983 | if (l > (INT_MAX - SSL3_HM_HEADER_LENGTH)) { | |
984 | al = SSL_AD_ILLEGAL_PARAMETER; | |
985 | SSLerr(SSL_F_TLS_GET_MESSAGE_HEADER, SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
986 | goto f_err; | |
32ec4153 | 987 | } |
9ab930b2 MC |
988 | s->s3->tmp.message_size = l; |
989 | ||
990 | s->init_msg = s->init_buf->data + SSL3_HM_HEADER_LENGTH; | |
991 | s->init_num = 0; | |
992 | } | |
993 | ||
994 | return 1; | |
995 | f_err: | |
996 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
9ab930b2 MC |
997 | return 0; |
998 | } | |
999 | ||
eda75751 | 1000 | int tls_get_message_body(SSL *s, size_t *len) |
9ab930b2 | 1001 | { |
54105ddd | 1002 | size_t n, readbytes; |
9ab930b2 MC |
1003 | unsigned char *p; |
1004 | int i; | |
1005 | ||
1006 | if (s->s3->tmp.message_type == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
1007 | /* We've already read everything in */ | |
1008 | *len = (unsigned long)s->init_num; | |
1009 | return 1; | |
0f113f3e MC |
1010 | } |
1011 | ||
0f113f3e MC |
1012 | p = s->init_msg; |
1013 | n = s->s3->tmp.message_size - s->init_num; | |
1014 | while (n > 0) { | |
657da85e | 1015 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL, |
54105ddd | 1016 | &p[s->init_num], n, 0, &readbytes); |
0f113f3e MC |
1017 | if (i <= 0) { |
1018 | s->rwstate = SSL_READING; | |
9ab930b2 MC |
1019 | *len = 0; |
1020 | return 0; | |
0f113f3e | 1021 | } |
54105ddd MC |
1022 | s->init_num += readbytes; |
1023 | n -= readbytes; | |
0f113f3e | 1024 | } |
ee2ffc27 | 1025 | |
bf48836c | 1026 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
1027 | /* |
1028 | * If receiving Finished, record MAC of prior handshake messages for | |
1029 | * Finished verification. | |
1030 | */ | |
1031 | if (*s->init_buf->data == SSL3_MT_FINISHED) | |
1032 | ssl3_take_mac(s); | |
ee2ffc27 BL |
1033 | #endif |
1034 | ||
0f113f3e | 1035 | /* Feed this message into MAC computation. */ |
e8aa8b6c | 1036 | if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) { |
d166ed8c DSH |
1037 | if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, |
1038 | s->init_num)) { | |
1039 | SSLerr(SSL_F_TLS_GET_MESSAGE_BODY, ERR_R_EVP_LIB); | |
1040 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
1041 | *len = 0; | |
1042 | return 0; | |
1043 | } | |
32ec4153 | 1044 | if (s->msg_callback) |
a230b26e | 1045 | s->msg_callback(0, SSL2_VERSION, 0, s->init_buf->data, |
32ec4153 MC |
1046 | (size_t)s->init_num, s, s->msg_callback_arg); |
1047 | } else { | |
d166ed8c | 1048 | if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, |
a230b26e | 1049 | s->init_num + SSL3_HM_HEADER_LENGTH)) { |
d166ed8c DSH |
1050 | SSLerr(SSL_F_TLS_GET_MESSAGE_BODY, ERR_R_EVP_LIB); |
1051 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
1052 | *len = 0; | |
1053 | return 0; | |
1054 | } | |
32ec4153 MC |
1055 | if (s->msg_callback) |
1056 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, | |
1057 | (size_t)s->init_num + SSL3_HM_HEADER_LENGTH, s, | |
1058 | s->msg_callback_arg); | |
1059 | } | |
1060 | ||
eda75751 | 1061 | *len = s->init_num; |
9ab930b2 | 1062 | return 1; |
0f113f3e | 1063 | } |
d02b48c6 | 1064 | |
2e5ead83 | 1065 | int ssl_cert_type(const X509 *x, const EVP_PKEY *pk) |
0f113f3e | 1066 | { |
a230b26e | 1067 | if (pk == NULL && (pk = X509_get0_pubkey(x)) == NULL) |
17a72388 VD |
1068 | return -1; |
1069 | ||
1070 | switch (EVP_PKEY_id(pk)) { | |
1071 | default: | |
1072 | return -1; | |
1073 | case EVP_PKEY_RSA: | |
d0ff28f8 | 1074 | return SSL_PKEY_RSA; |
17a72388 VD |
1075 | case EVP_PKEY_DSA: |
1076 | return SSL_PKEY_DSA_SIGN; | |
ea262260 | 1077 | #ifndef OPENSSL_NO_EC |
17a72388 VD |
1078 | case EVP_PKEY_EC: |
1079 | return SSL_PKEY_ECC; | |
ea262260 | 1080 | #endif |
2a9b9654 | 1081 | #ifndef OPENSSL_NO_GOST |
17a72388 VD |
1082 | case NID_id_GostR3410_2001: |
1083 | return SSL_PKEY_GOST01; | |
1084 | case NID_id_GostR3410_2012_256: | |
1085 | return SSL_PKEY_GOST12_256; | |
1086 | case NID_id_GostR3410_2012_512: | |
1087 | return SSL_PKEY_GOST12_512; | |
2a9b9654 | 1088 | #endif |
82049c54 | 1089 | } |
0f113f3e | 1090 | } |
d02b48c6 | 1091 | |
6b691a5c | 1092 | int ssl_verify_alarm_type(long type) |
0f113f3e MC |
1093 | { |
1094 | int al; | |
1095 | ||
1096 | switch (type) { | |
1097 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: | |
1098 | case X509_V_ERR_UNABLE_TO_GET_CRL: | |
1099 | case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: | |
1100 | al = SSL_AD_UNKNOWN_CA; | |
1101 | break; | |
1102 | case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: | |
1103 | case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: | |
1104 | case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: | |
1105 | case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: | |
1106 | case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: | |
1107 | case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: | |
1108 | case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: | |
1109 | case X509_V_ERR_CERT_NOT_YET_VALID: | |
1110 | case X509_V_ERR_CRL_NOT_YET_VALID: | |
1111 | case X509_V_ERR_CERT_UNTRUSTED: | |
1112 | case X509_V_ERR_CERT_REJECTED: | |
f3e235ed VD |
1113 | case X509_V_ERR_HOSTNAME_MISMATCH: |
1114 | case X509_V_ERR_EMAIL_MISMATCH: | |
1115 | case X509_V_ERR_IP_ADDRESS_MISMATCH: | |
1116 | case X509_V_ERR_DANE_NO_MATCH: | |
1117 | case X509_V_ERR_EE_KEY_TOO_SMALL: | |
1118 | case X509_V_ERR_CA_KEY_TOO_SMALL: | |
1119 | case X509_V_ERR_CA_MD_TOO_WEAK: | |
0f113f3e MC |
1120 | al = SSL_AD_BAD_CERTIFICATE; |
1121 | break; | |
1122 | case X509_V_ERR_CERT_SIGNATURE_FAILURE: | |
1123 | case X509_V_ERR_CRL_SIGNATURE_FAILURE: | |
1124 | al = SSL_AD_DECRYPT_ERROR; | |
1125 | break; | |
1126 | case X509_V_ERR_CERT_HAS_EXPIRED: | |
1127 | case X509_V_ERR_CRL_HAS_EXPIRED: | |
1128 | al = SSL_AD_CERTIFICATE_EXPIRED; | |
1129 | break; | |
1130 | case X509_V_ERR_CERT_REVOKED: | |
1131 | al = SSL_AD_CERTIFICATE_REVOKED; | |
1132 | break; | |
f3e235ed | 1133 | case X509_V_ERR_UNSPECIFIED: |
0f113f3e | 1134 | case X509_V_ERR_OUT_OF_MEM: |
f3e235ed VD |
1135 | case X509_V_ERR_INVALID_CALL: |
1136 | case X509_V_ERR_STORE_LOOKUP: | |
0f113f3e MC |
1137 | al = SSL_AD_INTERNAL_ERROR; |
1138 | break; | |
1139 | case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: | |
1140 | case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: | |
1141 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: | |
1142 | case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: | |
1143 | case X509_V_ERR_CERT_CHAIN_TOO_LONG: | |
1144 | case X509_V_ERR_PATH_LENGTH_EXCEEDED: | |
1145 | case X509_V_ERR_INVALID_CA: | |
1146 | al = SSL_AD_UNKNOWN_CA; | |
1147 | break; | |
1148 | case X509_V_ERR_APPLICATION_VERIFICATION: | |
1149 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1150 | break; | |
1151 | case X509_V_ERR_INVALID_PURPOSE: | |
1152 | al = SSL_AD_UNSUPPORTED_CERTIFICATE; | |
1153 | break; | |
1154 | default: | |
1155 | al = SSL_AD_CERTIFICATE_UNKNOWN; | |
1156 | break; | |
1157 | } | |
1158 | return (al); | |
1159 | } | |
d02b48c6 | 1160 | |
b362ccab | 1161 | int ssl_allow_compression(SSL *s) |
0f113f3e MC |
1162 | { |
1163 | if (s->options & SSL_OP_NO_COMPRESSION) | |
1164 | return 0; | |
1165 | return ssl_security(s, SSL_SECOP_COMPRESSION, 0, 0, NULL); | |
1166 | } | |
4fa52141 | 1167 | |
068c358a | 1168 | static int version_cmp(const SSL *s, int a, int b) |
4fa52141 VD |
1169 | { |
1170 | int dtls = SSL_IS_DTLS(s); | |
1171 | ||
1172 | if (a == b) | |
1173 | return 0; | |
1174 | if (!dtls) | |
1175 | return a < b ? -1 : 1; | |
1176 | return DTLS_VERSION_LT(a, b) ? -1 : 1; | |
1177 | } | |
1178 | ||
1179 | typedef struct { | |
1180 | int version; | |
a230b26e EK |
1181 | const SSL_METHOD *(*cmeth) (void); |
1182 | const SSL_METHOD *(*smeth) (void); | |
4fa52141 VD |
1183 | } version_info; |
1184 | ||
582a17d6 MC |
1185 | #if TLS_MAX_VERSION != TLS1_3_VERSION |
1186 | # error Code needs update for TLS_method() support beyond TLS1_3_VERSION. | |
4fa52141 VD |
1187 | #endif |
1188 | ||
1189 | static const version_info tls_version_table[] = { | |
582a17d6 MC |
1190 | #ifndef OPENSSL_NO_TLS1_3 |
1191 | {TLS1_3_VERSION, tlsv1_3_client_method, tlsv1_3_server_method}, | |
1192 | #else | |
1193 | {TLS1_3_VERSION, NULL, NULL}, | |
1194 | #endif | |
6b01bed2 | 1195 | #ifndef OPENSSL_NO_TLS1_2 |
a230b26e | 1196 | {TLS1_2_VERSION, tlsv1_2_client_method, tlsv1_2_server_method}, |
6b01bed2 | 1197 | #else |
a230b26e | 1198 | {TLS1_2_VERSION, NULL, NULL}, |
6b01bed2 VD |
1199 | #endif |
1200 | #ifndef OPENSSL_NO_TLS1_1 | |
a230b26e | 1201 | {TLS1_1_VERSION, tlsv1_1_client_method, tlsv1_1_server_method}, |
6b01bed2 | 1202 | #else |
a230b26e | 1203 | {TLS1_1_VERSION, NULL, NULL}, |
6b01bed2 VD |
1204 | #endif |
1205 | #ifndef OPENSSL_NO_TLS1 | |
a230b26e | 1206 | {TLS1_VERSION, tlsv1_client_method, tlsv1_server_method}, |
6b01bed2 | 1207 | #else |
a230b26e | 1208 | {TLS1_VERSION, NULL, NULL}, |
6b01bed2 | 1209 | #endif |
4fa52141 | 1210 | #ifndef OPENSSL_NO_SSL3 |
a230b26e | 1211 | {SSL3_VERSION, sslv3_client_method, sslv3_server_method}, |
6b01bed2 | 1212 | #else |
a230b26e | 1213 | {SSL3_VERSION, NULL, NULL}, |
4fa52141 | 1214 | #endif |
a230b26e | 1215 | {0, NULL, NULL}, |
4fa52141 VD |
1216 | }; |
1217 | ||
1218 | #if DTLS_MAX_VERSION != DTLS1_2_VERSION | |
1219 | # error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION. | |
1220 | #endif | |
1221 | ||
1222 | static const version_info dtls_version_table[] = { | |
6b01bed2 | 1223 | #ifndef OPENSSL_NO_DTLS1_2 |
a230b26e | 1224 | {DTLS1_2_VERSION, dtlsv1_2_client_method, dtlsv1_2_server_method}, |
6b01bed2 | 1225 | #else |
a230b26e | 1226 | {DTLS1_2_VERSION, NULL, NULL}, |
6b01bed2 VD |
1227 | #endif |
1228 | #ifndef OPENSSL_NO_DTLS1 | |
a230b26e EK |
1229 | {DTLS1_VERSION, dtlsv1_client_method, dtlsv1_server_method}, |
1230 | {DTLS1_BAD_VER, dtls_bad_ver_client_method, NULL}, | |
6b01bed2 | 1231 | #else |
a230b26e EK |
1232 | {DTLS1_VERSION, NULL, NULL}, |
1233 | {DTLS1_BAD_VER, NULL, NULL}, | |
6b01bed2 | 1234 | #endif |
a230b26e | 1235 | {0, NULL, NULL}, |
4fa52141 VD |
1236 | }; |
1237 | ||
1238 | /* | |
1239 | * ssl_method_error - Check whether an SSL_METHOD is enabled. | |
1240 | * | |
1241 | * @s: The SSL handle for the candidate method | |
1242 | * @method: the intended method. | |
1243 | * | |
1244 | * Returns 0 on success, or an SSL error reason on failure. | |
1245 | */ | |
068c358a | 1246 | static int ssl_method_error(const SSL *s, const SSL_METHOD *method) |
4fa52141 VD |
1247 | { |
1248 | int version = method->version; | |
1249 | ||
1250 | if ((s->min_proto_version != 0 && | |
1251 | version_cmp(s, version, s->min_proto_version) < 0) || | |
1252 | ssl_security(s, SSL_SECOP_VERSION, 0, version, NULL) == 0) | |
1253 | return SSL_R_VERSION_TOO_LOW; | |
1254 | ||
1255 | if (s->max_proto_version != 0 && | |
a230b26e | 1256 | version_cmp(s, version, s->max_proto_version) > 0) |
4fa52141 VD |
1257 | return SSL_R_VERSION_TOO_HIGH; |
1258 | ||
1259 | if ((s->options & method->mask) != 0) | |
1260 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
1261 | if ((method->flags & SSL_METHOD_NO_SUITEB) != 0 && tls1_suiteb(s)) | |
1262 | return SSL_R_AT_LEAST_TLS_1_2_NEEDED_IN_SUITEB_MODE; | |
1263 | else if ((method->flags & SSL_METHOD_NO_FIPS) != 0 && FIPS_mode()) | |
1264 | return SSL_R_AT_LEAST_TLS_1_0_NEEDED_IN_FIPS_MODE; | |
1265 | ||
1266 | return 0; | |
1267 | } | |
1268 | ||
ccae4a15 FI |
1269 | /* |
1270 | * ssl_version_supported - Check that the specified `version` is supported by | |
1271 | * `SSL *` instance | |
1272 | * | |
1273 | * @s: The SSL handle for the candidate method | |
1274 | * @version: Protocol version to test against | |
1275 | * | |
1276 | * Returns 1 when supported, otherwise 0 | |
1277 | */ | |
1278 | int ssl_version_supported(const SSL *s, int version) | |
1279 | { | |
1280 | const version_info *vent; | |
1281 | const version_info *table; | |
1282 | ||
1283 | switch (s->method->version) { | |
1284 | default: | |
1285 | /* Version should match method version for non-ANY method */ | |
1286 | return version_cmp(s, version, s->version) == 0; | |
1287 | case TLS_ANY_VERSION: | |
1288 | table = tls_version_table; | |
1289 | break; | |
1290 | case DTLS_ANY_VERSION: | |
1291 | table = dtls_version_table; | |
1292 | break; | |
1293 | } | |
1294 | ||
1295 | for (vent = table; | |
1296 | vent->version != 0 && version_cmp(s, version, vent->version) <= 0; | |
1297 | ++vent) { | |
1298 | if (vent->cmeth != NULL && | |
1299 | version_cmp(s, version, vent->version) == 0 && | |
1300 | ssl_method_error(s, vent->cmeth()) == 0) { | |
1301 | return 1; | |
1302 | } | |
1303 | } | |
1304 | return 0; | |
1305 | } | |
1306 | ||
4fa52141 VD |
1307 | /* |
1308 | * ssl_check_version_downgrade - In response to RFC7507 SCSV version | |
1309 | * fallback indication from a client check whether we're using the highest | |
1310 | * supported protocol version. | |
1311 | * | |
1312 | * @s server SSL handle. | |
1313 | * | |
1314 | * Returns 1 when using the highest enabled version, 0 otherwise. | |
1315 | */ | |
1316 | int ssl_check_version_downgrade(SSL *s) | |
1317 | { | |
1318 | const version_info *vent; | |
1319 | const version_info *table; | |
1320 | ||
1321 | /* | |
1322 | * Check that the current protocol is the highest enabled version | |
1323 | * (according to s->ctx->method, as version negotiation may have changed | |
1324 | * s->method). | |
1325 | */ | |
1326 | if (s->version == s->ctx->method->version) | |
1327 | return 1; | |
1328 | ||
1329 | /* | |
1330 | * Apparently we're using a version-flexible SSL_METHOD (not at its | |
1331 | * highest protocol version). | |
1332 | */ | |
1333 | if (s->ctx->method->version == TLS_method()->version) | |
1334 | table = tls_version_table; | |
1335 | else if (s->ctx->method->version == DTLS_method()->version) | |
1336 | table = dtls_version_table; | |
1337 | else { | |
1338 | /* Unexpected state; fail closed. */ | |
1339 | return 0; | |
1340 | } | |
1341 | ||
1342 | for (vent = table; vent->version != 0; ++vent) { | |
a230b26e | 1343 | if (vent->smeth != NULL && ssl_method_error(s, vent->smeth()) == 0) |
4fa52141 VD |
1344 | return s->version == vent->version; |
1345 | } | |
1346 | return 0; | |
1347 | } | |
1348 | ||
1349 | /* | |
1350 | * ssl_set_version_bound - set an upper or lower bound on the supported (D)TLS | |
1351 | * protocols, provided the initial (D)TLS method is version-flexible. This | |
1352 | * function sanity-checks the proposed value and makes sure the method is | |
1353 | * version-flexible, then sets the limit if all is well. | |
1354 | * | |
1355 | * @method_version: The version of the current SSL_METHOD. | |
1356 | * @version: the intended limit. | |
1357 | * @bound: pointer to limit to be updated. | |
1358 | * | |
1359 | * Returns 1 on success, 0 on failure. | |
1360 | */ | |
1361 | int ssl_set_version_bound(int method_version, int version, int *bound) | |
1362 | { | |
869e978c KR |
1363 | if (version == 0) { |
1364 | *bound = version; | |
1365 | return 1; | |
1366 | } | |
1367 | ||
4fa52141 VD |
1368 | /*- |
1369 | * Restrict TLS methods to TLS protocol versions. | |
1370 | * Restrict DTLS methods to DTLS protocol versions. | |
1371 | * Note, DTLS version numbers are decreasing, use comparison macros. | |
1372 | * | |
1373 | * Note that for both lower-bounds we use explicit versions, not | |
1374 | * (D)TLS_MIN_VERSION. This is because we don't want to break user | |
1375 | * configurations. If the MIN (supported) version ever rises, the user's | |
1376 | * "floor" remains valid even if no longer available. We don't expect the | |
1377 | * MAX ceiling to ever get lower, so making that variable makes sense. | |
1378 | */ | |
1379 | switch (method_version) { | |
1380 | default: | |
1381 | /* | |
1382 | * XXX For fixed version methods, should we always fail and not set any | |
1383 | * bounds, always succeed and not set any bounds, or set the bounds and | |
1384 | * arrange to fail later if they are not met? At present fixed-version | |
1385 | * methods are not subject to controls that disable individual protocol | |
1386 | * versions. | |
1387 | */ | |
1388 | return 0; | |
1389 | ||
1390 | case TLS_ANY_VERSION: | |
1391 | if (version < SSL3_VERSION || version > TLS_MAX_VERSION) | |
1392 | return 0; | |
1393 | break; | |
1394 | ||
1395 | case DTLS_ANY_VERSION: | |
1396 | if (DTLS_VERSION_GT(version, DTLS_MAX_VERSION) || | |
032924c4 | 1397 | DTLS_VERSION_LT(version, DTLS1_BAD_VER)) |
4fa52141 VD |
1398 | return 0; |
1399 | break; | |
1400 | } | |
1401 | ||
1402 | *bound = version; | |
1403 | return 1; | |
1404 | } | |
1405 | ||
1406 | /* | |
1407 | * ssl_choose_server_version - Choose server (D)TLS version. Called when the | |
1408 | * client HELLO is received to select the final server protocol version and | |
1409 | * the version specific method. | |
1410 | * | |
1411 | * @s: server SSL handle. | |
1412 | * | |
1413 | * Returns 0 on success or an SSL error reason number on failure. | |
1414 | */ | |
1ab3836b | 1415 | int ssl_choose_server_version(SSL *s, CLIENTHELLO_MSG *hello) |
4fa52141 VD |
1416 | { |
1417 | /*- | |
1418 | * With version-flexible methods we have an initial state with: | |
1419 | * | |
1420 | * s->method->version == (D)TLS_ANY_VERSION, | |
1421 | * s->version == (D)TLS_MAX_VERSION. | |
1422 | * | |
1423 | * So we detect version-flexible methods via the method version, not the | |
1424 | * handle version. | |
1425 | */ | |
1426 | int server_version = s->method->version; | |
df7ce507 | 1427 | int client_version = hello->legacy_version; |
4fa52141 VD |
1428 | const version_info *vent; |
1429 | const version_info *table; | |
1430 | int disabled = 0; | |
cd998837 | 1431 | RAW_EXTENSION *suppversions; |
4fa52141 | 1432 | |
1ab3836b MC |
1433 | s->client_version = client_version; |
1434 | ||
4fa52141 VD |
1435 | switch (server_version) { |
1436 | default: | |
7d061fce MC |
1437 | if (!SSL_IS_TLS13(s)) { |
1438 | if (version_cmp(s, client_version, s->version) < 0) | |
1439 | return SSL_R_WRONG_SSL_VERSION; | |
1440 | /* | |
1441 | * If this SSL handle is not from a version flexible method we don't | |
1442 | * (and never did) check min/max FIPS or Suite B constraints. Hope | |
1443 | * that's OK. It is up to the caller to not choose fixed protocol | |
1444 | * versions they don't want. If not, then easy to fix, just return | |
1445 | * ssl_method_error(s, s->method) | |
1446 | */ | |
1447 | return 0; | |
1448 | } | |
d2f42576 | 1449 | /* |
7d061fce MC |
1450 | * Fall through if we are TLSv1.3 already (this means we must be after |
1451 | * a HelloRetryRequest | |
4fa52141 | 1452 | */ |
4fa52141 VD |
1453 | case TLS_ANY_VERSION: |
1454 | table = tls_version_table; | |
1455 | break; | |
1456 | case DTLS_ANY_VERSION: | |
1457 | table = dtls_version_table; | |
1458 | break; | |
1459 | } | |
1460 | ||
70af3d8e | 1461 | suppversions = &hello->pre_proc_exts[TLSEXT_IDX_supported_versions]; |
cd998837 | 1462 | |
70af3d8e | 1463 | if (suppversions->present && !SSL_IS_DTLS(s)) { |
cd998837 MC |
1464 | unsigned int candidate_vers = 0; |
1465 | unsigned int best_vers = 0; | |
1466 | const SSL_METHOD *best_method = NULL; | |
1467 | PACKET versionslist; | |
1468 | ||
6b473aca MC |
1469 | suppversions->parsed = 1; |
1470 | ||
16bce0e0 | 1471 | if (!PACKET_as_length_prefixed_1(&suppversions->data, &versionslist)) { |
cd998837 MC |
1472 | /* Trailing or invalid data? */ |
1473 | return SSL_R_LENGTH_MISMATCH; | |
1474 | } | |
1475 | ||
1476 | while (PACKET_get_net_2(&versionslist, &candidate_vers)) { | |
1477 | /* TODO(TLS1.3): Remove this before release */ | |
1478 | if (candidate_vers == TLS1_3_VERSION_DRAFT) | |
1479 | candidate_vers = TLS1_3_VERSION; | |
f2342b7a MC |
1480 | /* |
1481 | * TODO(TLS1.3): There is some discussion on the TLS list about | |
1482 | * wheter to ignore versions <TLS1.2 in supported_versions. At the | |
1483 | * moment we honour them if present. To be reviewed later | |
1484 | */ | |
cd998837 MC |
1485 | if (version_cmp(s, candidate_vers, best_vers) <= 0) |
1486 | continue; | |
1487 | for (vent = table; | |
1488 | vent->version != 0 && vent->version != (int)candidate_vers; | |
16bce0e0 | 1489 | ++vent) |
bf0ba5e7 | 1490 | continue; |
bf85ef1b | 1491 | if (vent->version != 0 && vent->smeth != NULL) { |
cd998837 MC |
1492 | const SSL_METHOD *method; |
1493 | ||
1494 | method = vent->smeth(); | |
1495 | if (ssl_method_error(s, method) == 0) { | |
1496 | best_vers = candidate_vers; | |
1497 | best_method = method; | |
1498 | } | |
1499 | } | |
1500 | } | |
1501 | if (PACKET_remaining(&versionslist) != 0) { | |
1502 | /* Trailing data? */ | |
1503 | return SSL_R_LENGTH_MISMATCH; | |
1504 | } | |
1505 | ||
1506 | if (best_vers > 0) { | |
7d061fce MC |
1507 | if (SSL_IS_TLS13(s)) { |
1508 | /* | |
1509 | * We get here if this is after a HelloRetryRequest. In this | |
1510 | * case we just check that we still negotiated TLSv1.3 | |
1511 | */ | |
1512 | if (best_vers != TLS1_3_VERSION) | |
1513 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
1514 | return 0; | |
1515 | } | |
cd998837 MC |
1516 | s->version = best_vers; |
1517 | s->method = best_method; | |
1518 | return 0; | |
1519 | } | |
1520 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
1521 | } | |
1522 | ||
1523 | /* | |
1524 | * If the supported versions extension isn't present, then the highest | |
1525 | * version we can negotiate is TLSv1.2 | |
1526 | */ | |
1527 | if (version_cmp(s, client_version, TLS1_3_VERSION) >= 0) | |
1528 | client_version = TLS1_2_VERSION; | |
1529 | ||
1530 | /* | |
1531 | * No supported versions extension, so we just use the version supplied in | |
1532 | * the ClientHello. | |
1533 | */ | |
4fa52141 VD |
1534 | for (vent = table; vent->version != 0; ++vent) { |
1535 | const SSL_METHOD *method; | |
1536 | ||
1537 | if (vent->smeth == NULL || | |
1538 | version_cmp(s, client_version, vent->version) < 0) | |
1539 | continue; | |
1540 | method = vent->smeth(); | |
1541 | if (ssl_method_error(s, method) == 0) { | |
1542 | s->version = vent->version; | |
1543 | s->method = method; | |
1544 | return 0; | |
1545 | } | |
1546 | disabled = 1; | |
1547 | } | |
1548 | return disabled ? SSL_R_UNSUPPORTED_PROTOCOL : SSL_R_VERSION_TOO_LOW; | |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | * ssl_choose_client_version - Choose client (D)TLS version. Called when the | |
1553 | * server HELLO is received to select the final client protocol version and | |
1554 | * the version specific method. | |
1555 | * | |
1556 | * @s: client SSL handle. | |
1557 | * @version: The proposed version from the server's HELLO. | |
1558 | * | |
1559 | * Returns 0 on success or an SSL error reason number on failure. | |
1560 | */ | |
1561 | int ssl_choose_client_version(SSL *s, int version) | |
1562 | { | |
1563 | const version_info *vent; | |
1564 | const version_info *table; | |
1565 | ||
b97667ce MC |
1566 | /* TODO(TLS1.3): Remove this before release */ |
1567 | if (version == TLS1_3_VERSION_DRAFT) | |
1568 | version = TLS1_3_VERSION; | |
1569 | ||
4fa52141 VD |
1570 | switch (s->method->version) { |
1571 | default: | |
1572 | if (version != s->version) | |
1573 | return SSL_R_WRONG_SSL_VERSION; | |
1574 | /* | |
1575 | * If this SSL handle is not from a version flexible method we don't | |
1576 | * (and never did) check min/max, FIPS or Suite B constraints. Hope | |
1577 | * that's OK. It is up to the caller to not choose fixed protocol | |
1578 | * versions they don't want. If not, then easy to fix, just return | |
1579 | * ssl_method_error(s, s->method) | |
1580 | */ | |
4fa52141 VD |
1581 | return 0; |
1582 | case TLS_ANY_VERSION: | |
1583 | table = tls_version_table; | |
1584 | break; | |
1585 | case DTLS_ANY_VERSION: | |
1586 | table = dtls_version_table; | |
1587 | break; | |
1588 | } | |
1589 | ||
1590 | for (vent = table; vent->version != 0; ++vent) { | |
1591 | const SSL_METHOD *method; | |
1592 | int err; | |
1593 | ||
1594 | if (version != vent->version) | |
1595 | continue; | |
1596 | if (vent->cmeth == NULL) | |
1597 | break; | |
3847d426 MC |
1598 | if (s->hello_retry_request && version != TLS1_3_VERSION) |
1599 | return SSL_R_WRONG_SSL_VERSION; | |
1600 | ||
4fa52141 VD |
1601 | method = vent->cmeth(); |
1602 | err = ssl_method_error(s, method); | |
1603 | if (err != 0) | |
1604 | return err; | |
1605 | s->method = method; | |
ccae4a15 | 1606 | s->version = version; |
4fa52141 VD |
1607 | return 0; |
1608 | } | |
1609 | ||
1610 | return SSL_R_UNSUPPORTED_PROTOCOL; | |
1611 | } | |
1612 | ||
068c358a KR |
1613 | /* |
1614 | * ssl_get_client_min_max_version - get minimum and maximum client version | |
1615 | * @s: The SSL connection | |
1616 | * @min_version: The minimum supported version | |
1617 | * @max_version: The maximum supported version | |
1618 | * | |
1619 | * Work out what version we should be using for the initial ClientHello if the | |
1620 | * version is initially (D)TLS_ANY_VERSION. We apply any explicit SSL_OP_NO_xxx | |
1621 | * options, the MinProtocol and MaxProtocol configuration commands, any Suite B | |
1622 | * or FIPS_mode() constraints and any floor imposed by the security level here, | |
1623 | * so we don't advertise the wrong protocol version to only reject the outcome later. | |
4fa52141 | 1624 | * |
0485d540 | 1625 | * Computing the right floor matters. If, e.g., TLS 1.0 and 1.2 are enabled, |
4fa52141 VD |
1626 | * TLS 1.1 is disabled, but the security level, Suite-B and/or MinProtocol |
1627 | * only allow TLS 1.2, we want to advertise TLS1.2, *not* TLS1. | |
1628 | * | |
068c358a KR |
1629 | * Returns 0 on success or an SSL error reason number on failure. On failure |
1630 | * min_version and max_version will also be set to 0. | |
4fa52141 | 1631 | */ |
a230b26e EK |
1632 | int ssl_get_client_min_max_version(const SSL *s, int *min_version, |
1633 | int *max_version) | |
4fa52141 VD |
1634 | { |
1635 | int version; | |
1636 | int hole; | |
1637 | const SSL_METHOD *single = NULL; | |
1638 | const SSL_METHOD *method; | |
1639 | const version_info *table; | |
1640 | const version_info *vent; | |
1641 | ||
1642 | switch (s->method->version) { | |
1643 | default: | |
1644 | /* | |
1645 | * If this SSL handle is not from a version flexible method we don't | |
1646 | * (and never did) check min/max FIPS or Suite B constraints. Hope | |
1647 | * that's OK. It is up to the caller to not choose fixed protocol | |
1648 | * versions they don't want. If not, then easy to fix, just return | |
1649 | * ssl_method_error(s, s->method) | |
1650 | */ | |
068c358a | 1651 | *min_version = *max_version = s->version; |
4fa52141 VD |
1652 | return 0; |
1653 | case TLS_ANY_VERSION: | |
1654 | table = tls_version_table; | |
1655 | break; | |
1656 | case DTLS_ANY_VERSION: | |
1657 | table = dtls_version_table; | |
1658 | break; | |
1659 | } | |
1660 | ||
1661 | /* | |
1662 | * SSL_OP_NO_X disables all protocols above X *if* there are some protocols | |
1663 | * below X enabled. This is required in order to maintain the "version | |
1664 | * capability" vector contiguous. Any versions with a NULL client method | |
1665 | * (protocol version client is disabled at compile-time) is also a "hole". | |
1666 | * | |
1667 | * Our initial state is hole == 1, version == 0. That is, versions above | |
1668 | * the first version in the method table are disabled (a "hole" above | |
1669 | * the valid protocol entries) and we don't have a selected version yet. | |
1670 | * | |
1671 | * Whenever "hole == 1", and we hit an enabled method, its version becomes | |
1672 | * the selected version, and the method becomes a candidate "single" | |
1673 | * method. We're no longer in a hole, so "hole" becomes 0. | |
1674 | * | |
1675 | * If "hole == 0" and we hit an enabled method, then "single" is cleared, | |
1676 | * as we support a contiguous range of at least two methods. If we hit | |
1677 | * a disabled method, then hole becomes true again, but nothing else | |
1678 | * changes yet, because all the remaining methods may be disabled too. | |
1679 | * If we again hit an enabled method after the new hole, it becomes | |
1680 | * selected, as we start from scratch. | |
1681 | */ | |
068c358a | 1682 | *min_version = version = 0; |
4fa52141 VD |
1683 | hole = 1; |
1684 | for (vent = table; vent->version != 0; ++vent) { | |
1685 | /* | |
1686 | * A table entry with a NULL client method is still a hole in the | |
1687 | * "version capability" vector. | |
1688 | */ | |
1689 | if (vent->cmeth == NULL) { | |
1690 | hole = 1; | |
1691 | continue; | |
1692 | } | |
1693 | method = vent->cmeth(); | |
1694 | if (ssl_method_error(s, method) != 0) { | |
1695 | hole = 1; | |
1696 | } else if (!hole) { | |
1697 | single = NULL; | |
068c358a | 1698 | *min_version = method->version; |
4fa52141 VD |
1699 | } else { |
1700 | version = (single = method)->version; | |
068c358a | 1701 | *min_version = version; |
4fa52141 VD |
1702 | hole = 0; |
1703 | } | |
1704 | } | |
1705 | ||
068c358a KR |
1706 | *max_version = version; |
1707 | ||
4fa52141 VD |
1708 | /* Fail if everything is disabled */ |
1709 | if (version == 0) | |
1710 | return SSL_R_NO_PROTOCOLS_AVAILABLE; | |
1711 | ||
068c358a KR |
1712 | return 0; |
1713 | } | |
1714 | ||
1715 | /* | |
1716 | * ssl_set_client_hello_version - Work out what version we should be using for | |
7acb8b64 | 1717 | * the initial ClientHello.legacy_version field. |
068c358a KR |
1718 | * |
1719 | * @s: client SSL handle. | |
1720 | * | |
1721 | * Returns 0 on success or an SSL error reason number on failure. | |
1722 | */ | |
1723 | int ssl_set_client_hello_version(SSL *s) | |
1724 | { | |
3eb2aff4 | 1725 | int ver_min, ver_max, ret; |
068c358a | 1726 | |
3eb2aff4 | 1727 | ret = ssl_get_client_min_max_version(s, &ver_min, &ver_max); |
068c358a KR |
1728 | |
1729 | if (ret != 0) | |
1730 | return ret; | |
1731 | ||
7acb8b64 MC |
1732 | s->version = ver_max; |
1733 | ||
1734 | /* TLS1.3 always uses TLS1.2 in the legacy_version field */ | |
1735 | if (!SSL_IS_DTLS(s) && ver_max > TLS1_2_VERSION) | |
1736 | ver_max = TLS1_2_VERSION; | |
1737 | ||
1738 | s->client_version = ver_max; | |
4fa52141 VD |
1739 | return 0; |
1740 | } | |
aff9929b MC |
1741 | |
1742 | /* | |
1743 | * Checks a list of |groups| to determine if the |group_id| is in it. If it is | |
1744 | * and |checkallow| is 1 then additionally check if the group is allowed to be | |
1745 | * used. Returns 1 if the group is in the list (and allowed if |checkallow| is | |
1746 | * 1) or 0 otherwise. | |
1747 | */ | |
deb2d5e7 | 1748 | #ifndef OPENSSL_NO_EC |
aff9929b MC |
1749 | int check_in_list(SSL *s, unsigned int group_id, const unsigned char *groups, |
1750 | size_t num_groups, int checkallow) | |
1751 | { | |
1752 | size_t i; | |
1753 | ||
1754 | if (groups == NULL || num_groups == 0) | |
1755 | return 0; | |
1756 | ||
1757 | for (i = 0; i < num_groups; i++, groups += 2) { | |
1758 | unsigned int share_id = (groups[0] << 8) | (groups[1]); | |
1759 | ||
1760 | if (group_id == share_id | |
1761 | && (!checkallow | |
1762 | || tls_curve_allowed(s, groups, SSL_SECOP_CURVE_CHECK))) { | |
1763 | break; | |
1764 | } | |
1765 | } | |
1766 | ||
1767 | /* If i == num_groups then not in the list */ | |
1768 | return i < num_groups; | |
1769 | } | |
deb2d5e7 | 1770 | #endif |