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[thirdparty/openssl.git] / ssl / t1_lib.c
CommitLineData
846e33c7
RS		 1/*
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
f1fd4544 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
f1fd4544 8 */
58964a49
RE		 9
10#include <stdio.h>
aa474d1f 11#include <stdlib.h>
ec577822 12#include <openssl/objects.h>
6434abbf
DSH		 13#include <openssl/evp.h>
14#include <openssl/hmac.h>
67c8e7f4 15#include <openssl/ocsp.h>
5951e840
MC		 16#include <openssl/conf.h>
17#include <openssl/x509v3.h>
3c27208f
RS		 18#include <openssl/dh.h>
19#include <openssl/bn.h>
58964a49 20#include "ssl_locl.h"
3c27208f 21#include <openssl/ct.h>
58964a49 22
0f113f3e
MC		 23SSL3_ENC_METHOD const TLSv1_enc_data = {
24 tls1_enc,
25 tls1_mac,
26 tls1_setup_key_block,
27 tls1_generate_master_secret,
28 tls1_change_cipher_state,
29 tls1_final_finish_mac,
0f113f3e
MC		 30 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
31 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
32 tls1_alert_code,
33 tls1_export_keying_material,
34 0,
a29fa98c 35 ssl3_set_handshake_header,
2c7b4dbc 36 tls_close_construct_packet,
0f113f3e
MC		 37 ssl3_handshake_write
38};
39
40SSL3_ENC_METHOD const TLSv1_1_enc_data = {
41 tls1_enc,
42 tls1_mac,
43 tls1_setup_key_block,
44 tls1_generate_master_secret,
45 tls1_change_cipher_state,
46 tls1_final_finish_mac,
0f113f3e
MC		 47 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
48 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
49 tls1_alert_code,
50 tls1_export_keying_material,
51 SSL_ENC_FLAG_EXPLICIT_IV,
a29fa98c 52 ssl3_set_handshake_header,
2c7b4dbc 53 tls_close_construct_packet,
0f113f3e
MC		 54 ssl3_handshake_write
55};
56
57SSL3_ENC_METHOD const TLSv1_2_enc_data = {
58 tls1_enc,
59 tls1_mac,
60 tls1_setup_key_block,
61 tls1_generate_master_secret,
62 tls1_change_cipher_state,
63 tls1_final_finish_mac,
0f113f3e
MC		 64 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
65 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
66 tls1_alert_code,
67 tls1_export_keying_material,
68 SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF
69 | SSL_ENC_FLAG_TLS1_2_CIPHERS,
a29fa98c 70 ssl3_set_handshake_header,
2c7b4dbc 71 tls_close_construct_packet,
0f113f3e
MC		 72 ssl3_handshake_write
73};
58964a49 74
582a17d6 75SSL3_ENC_METHOD const TLSv1_3_enc_data = {
bebc0c7d 76 tls13_enc,
582a17d6 77 tls1_mac,
92760c21
MC		 78 tls13_setup_key_block,
79 tls13_generate_master_secret,
80 tls13_change_cipher_state,
81 tls13_final_finish_mac,
582a17d6
MC		 82 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
83 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
04904312 84 tls13_alert_code,
582a17d6 85 tls1_export_keying_material,
bebc0c7d 86 SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF,
582a17d6
MC		 87 ssl3_set_handshake_header,
88 tls_close_construct_packet,
89 ssl3_handshake_write
90};
91
f3b656b2 92long tls1_default_timeout(void)
0f113f3e
MC		 93{
94 /*
95 * 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for
96 * http, the cache would over fill
97 */
98 return (60 * 60 * 2);
99}
58964a49 100
6b691a5c 101int tls1_new(SSL *s)
0f113f3e
MC		 102{
103 if (!ssl3_new(s))
b77f3ed1
MC		 104 return 0;
105 if (!s->method->ssl_clear(s))
106 return 0;
107
108 return 1;
0f113f3e 109}
58964a49 110
6b691a5c 111void tls1_free(SSL *s)
0f113f3e 112{
aff8c126 113 OPENSSL_free(s->ext.session_ticket);
0f113f3e
MC		 114 ssl3_free(s);
115}
58964a49 116
b77f3ed1 117int tls1_clear(SSL *s)
0f113f3e 118{
b77f3ed1
MC		 119 if (!ssl3_clear(s))
120 return 0;
121
4fa52141
VD		 122 if (s->method->version == TLS_ANY_VERSION)
123 s->version = TLS_MAX_VERSION;
124 else
125 s->version = s->method->version;
b77f3ed1
MC		 126
127 return 1;
0f113f3e 128}
58964a49 129
525de5d3 130#ifndef OPENSSL_NO_EC
eda3766b 131
0f113f3e
MC		 132typedef struct {
133 int nid; /* Curve NID */
134 int secbits; /* Bits of security (from SP800-57) */
135 unsigned int flags; /* Flags: currently just field type */
136} tls_curve_info;
137
2dc1aeed
DSH		 138/*
139 * Table of curve information.
ddb4c047 140 * Do not delete entries or reorder this array! It is used as a lookup
2dc1aeed
DSH		 141 * table: the index of each entry is one less than the TLS curve id.
142 */
0f113f3e
MC		 143static const tls_curve_info nid_list[] = {
144 {NID_sect163k1, 80, TLS_CURVE_CHAR2}, /* sect163k1 (1) */
145 {NID_sect163r1, 80, TLS_CURVE_CHAR2}, /* sect163r1 (2) */
146 {NID_sect163r2, 80, TLS_CURVE_CHAR2}, /* sect163r2 (3) */
147 {NID_sect193r1, 80, TLS_CURVE_CHAR2}, /* sect193r1 (4) */
148 {NID_sect193r2, 80, TLS_CURVE_CHAR2}, /* sect193r2 (5) */
149 {NID_sect233k1, 112, TLS_CURVE_CHAR2}, /* sect233k1 (6) */
150 {NID_sect233r1, 112, TLS_CURVE_CHAR2}, /* sect233r1 (7) */
151 {NID_sect239k1, 112, TLS_CURVE_CHAR2}, /* sect239k1 (8) */
152 {NID_sect283k1, 128, TLS_CURVE_CHAR2}, /* sect283k1 (9) */
153 {NID_sect283r1, 128, TLS_CURVE_CHAR2}, /* sect283r1 (10) */
154 {NID_sect409k1, 192, TLS_CURVE_CHAR2}, /* sect409k1 (11) */
155 {NID_sect409r1, 192, TLS_CURVE_CHAR2}, /* sect409r1 (12) */
156 {NID_sect571k1, 256, TLS_CURVE_CHAR2}, /* sect571k1 (13) */
157 {NID_sect571r1, 256, TLS_CURVE_CHAR2}, /* sect571r1 (14) */
158 {NID_secp160k1, 80, TLS_CURVE_PRIME}, /* secp160k1 (15) */
159 {NID_secp160r1, 80, TLS_CURVE_PRIME}, /* secp160r1 (16) */
160 {NID_secp160r2, 80, TLS_CURVE_PRIME}, /* secp160r2 (17) */
161 {NID_secp192k1, 80, TLS_CURVE_PRIME}, /* secp192k1 (18) */
162 {NID_X9_62_prime192v1, 80, TLS_CURVE_PRIME}, /* secp192r1 (19) */
163 {NID_secp224k1, 112, TLS_CURVE_PRIME}, /* secp224k1 (20) */
164 {NID_secp224r1, 112, TLS_CURVE_PRIME}, /* secp224r1 (21) */
165 {NID_secp256k1, 128, TLS_CURVE_PRIME}, /* secp256k1 (22) */
166 {NID_X9_62_prime256v1, 128, TLS_CURVE_PRIME}, /* secp256r1 (23) */
167 {NID_secp384r1, 192, TLS_CURVE_PRIME}, /* secp384r1 (24) */
168 {NID_secp521r1, 256, TLS_CURVE_PRIME}, /* secp521r1 (25) */
169 {NID_brainpoolP256r1, 128, TLS_CURVE_PRIME}, /* brainpoolP256r1 (26) */
170 {NID_brainpoolP384r1, 192, TLS_CURVE_PRIME}, /* brainpoolP384r1 (27) */
171 {NID_brainpoolP512r1, 256, TLS_CURVE_PRIME}, /* brainpool512r1 (28) */
ec24630a 172 {NID_X25519, 128, TLS_CURVE_CUSTOM}, /* X25519 (29) */
0f113f3e
MC		 173};
174
175static const unsigned char ecformats_default[] = {
176 TLSEXT_ECPOINTFORMAT_uncompressed,
177 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
178 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
179};
180
fe6ef247
KR		 181/* The default curves */
182static const unsigned char eccurves_default[] = {
1db3107a 183 0, 29, /* X25519 (29) */
de57d237 184 0, 23, /* secp256r1 (23) */
0f113f3e 185 0, 25, /* secp521r1 (25) */
0f113f3e 186 0, 24, /* secp384r1 (24) */
de57d237
EK		 187};
188
0f113f3e
MC		 189static const unsigned char suiteb_curves[] = {
190 0, TLSEXT_curve_P_256,
191 0, TLSEXT_curve_P_384
192};
2ea80354 193
ec24630a 194int tls1_ec_curve_id2nid(int curve_id, unsigned int *pflags)
0f113f3e 195{
ec24630a 196 const tls_curve_info *cinfo;
0f113f3e 197 /* ECC curves from RFC 4492 and RFC 7027 */
b6eb9827 198 if ((curve_id < 1) || ((unsigned int)curve_id > OSSL_NELEM(nid_list)))
0f113f3e 199 return 0;
ec24630a
DSH		 200 cinfo = nid_list + curve_id - 1;
201 if (pflags)
202 *pflags = cinfo->flags;
203 return cinfo->nid;
0f113f3e 204}
525de5d3
DSH		 205
206int tls1_ec_nid2curve_id(int nid)
0f113f3e 207{
2fa2d15a
DSH		 208 size_t i;
209 for (i = 0; i < OSSL_NELEM(nid_list); i++) {
210 if (nid_list[i].nid == nid)
348240c6 211 return (int)(i + 1);
0f113f3e 212 }
2fa2d15a 213 return 0;
0f113f3e
MC		 214}
215
740580c2
EK		 216/*
217 * Get curves list, if "sess" is set return client curves otherwise
218 * preferred list.
219 * Sets |num_curves| to the number of curves in the list, i.e.,
220 * the length of |pcurves| is 2 * num_curves.
221 * Returns 1 on success and 0 if the client curves list has invalid format.
222 * The latter indicates an internal error: we should not be accepting such
223 * lists in the first place.
224 * TODO(emilia): we should really be storing the curves list in explicitly
225 * parsed form instead. (However, this would affect binary compatibility
226 * so cannot happen in the 1.0.x series.)
fd2b65ce 227 */
6b473aca
MC		 228int tls1_get_curvelist(SSL *s, int sess, const unsigned char **pcurves,
229 size_t *num_curves)
0f113f3e
MC		 230{
231 size_t pcurveslen = 0;
3e373518 232
0f113f3e 233 if (sess) {
aff8c126
RS		 234 *pcurves = s->session->ext.supportedgroups;
235 pcurveslen = s->session->ext.supportedgroups_len;
0f113f3e
MC		 236 } else {
237 /* For Suite B mode only include P-256, P-384 */
238 switch (tls1_suiteb(s)) {
239 case SSL_CERT_FLAG_SUITEB_128_LOS:
240 *pcurves = suiteb_curves;
241 pcurveslen = sizeof(suiteb_curves);
242 break;
243
244 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
245 *pcurves = suiteb_curves;
246 pcurveslen = 2;
247 break;
248
249 case SSL_CERT_FLAG_SUITEB_192_LOS:
250 *pcurves = suiteb_curves + 2;
251 pcurveslen = 2;
252 break;
253 default:
aff8c126
RS		 254 *pcurves = s->ext.supportedgroups;
255 pcurveslen = s->ext.supportedgroups_len;
0f113f3e
MC		 256 }
257 if (!*pcurves) {
fe6ef247
KR		 258 *pcurves = eccurves_default;
259 pcurveslen = sizeof(eccurves_default);
0f113f3e
MC		 260 }
261 }
262
263 /* We do not allow odd length arrays to enter the system. */
264 if (pcurveslen & 1) {
265 SSLerr(SSL_F_TLS1_GET_CURVELIST, ERR_R_INTERNAL_ERROR);
266 *num_curves = 0;
267 return 0;
0f113f3e 268 }
3e373518
RS		 269 *num_curves = pcurveslen / 2;
270 return 1;
0f113f3e 271}
b362ccab
DSH		 272
273/* See if curve is allowed by security callback */
6b473aca 274int tls_curve_allowed(SSL *s, const unsigned char *curve, int op)
0f113f3e
MC		 275{
276 const tls_curve_info *cinfo;
277 if (curve[0])
278 return 1;
b6eb9827 279 if ((curve[1] < 1) || ((size_t)curve[1] > OSSL_NELEM(nid_list)))
0f113f3e
MC		 280 return 0;
281 cinfo = &nid_list[curve[1] - 1];
282# ifdef OPENSSL_NO_EC2M
283 if (cinfo->flags & TLS_CURVE_CHAR2)
284 return 0;
285# endif
286 return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)curve);
287}
b362ccab 288
d18b716d
DSH		 289/* Check a curve is one of our preferences */
290int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
0f113f3e
MC		 291{
292 const unsigned char *curves;
293 size_t num_curves, i;
294 unsigned int suiteb_flags = tls1_suiteb(s);
295 if (len != 3 || p[0] != NAMED_CURVE_TYPE)
296 return 0;
297 /* Check curve matches Suite B preferences */
298 if (suiteb_flags) {
299 unsigned long cid = s->s3->tmp.new_cipher->id;
300 if (p[1])
301 return 0;
302 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) {
303 if (p[2] != TLSEXT_curve_P_256)
304 return 0;
305 } else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) {
306 if (p[2] != TLSEXT_curve_P_384)
307 return 0;
308 } else /* Should never happen */
309 return 0;
310 }
311 if (!tls1_get_curvelist(s, 0, &curves, &num_curves))
312 return 0;
313 for (i = 0; i < num_curves; i++, curves += 2) {
314 if (p[1] == curves[0] && p[2] == curves[1])
315 return tls_curve_allowed(s, p + 1, SSL_SECOP_CURVE_CHECK);
316 }
317 return 0;
318}
d0595f17 319
1d97c843 320/*-
de4d764e 321 * For nmatch >= 0, return the NID of the |nmatch|th shared group or NID_undef
6977e8ee
KR		 322 * if there is no match.
323 * For nmatch == -1, return number of matches
de4d764e 324 * For nmatch == -2, return the NID of the group to use for
376e2ca3 325 * an EC tmp key, or NID_undef if there is no match.
d0595f17 326 */
de4d764e 327int tls1_shared_group(SSL *s, int nmatch)
0f113f3e
MC		 328{
329 const unsigned char *pref, *supp;
330 size_t num_pref, num_supp, i, j;
331 int k;
3e373518 332
0f113f3e
MC		 333 /* Can't do anything on client side */
334 if (s->server == 0)
335 return -1;
336 if (nmatch == -2) {
337 if (tls1_suiteb(s)) {
338 /*
339 * For Suite B ciphersuite determines curve: we already know
340 * these are acceptable due to previous checks.
341 */
342 unsigned long cid = s->s3->tmp.new_cipher->id;
3e373518 343
0f113f3e
MC		 344 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
345 return NID_X9_62_prime256v1; /* P-256 */
346 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
347 return NID_secp384r1; /* P-384 */
348 /* Should never happen */
349 return NID_undef;
350 }
351 /* If not Suite B just return first preference shared curve */
352 nmatch = 0;
353 }
354 /*
355 * Avoid truncation. tls1_get_curvelist takes an int
356 * but s->options is a long...
357 */
3e373518
RS		 358 if (!tls1_get_curvelist(s,
359 (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0,
360 &supp, &num_supp))
0f113f3e
MC		 361 /* In practice, NID_undef == 0 but let's be precise. */
362 return nmatch == -1 ? 0 : NID_undef;
3e373518
RS		 363 if (!tls1_get_curvelist(s,
364 (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) == 0,
365 &pref, &num_pref))
0f113f3e 366 return nmatch == -1 ? 0 : NID_undef;
3c06513f 367
3e373518 368 for (k = 0, i = 0; i < num_pref; i++, pref += 2) {
0f113f3e 369 const unsigned char *tsupp = supp;
3e373518 370
0f113f3e
MC		 371 for (j = 0; j < num_supp; j++, tsupp += 2) {
372 if (pref[0] == tsupp[0] && pref[1] == tsupp[1]) {
373 if (!tls_curve_allowed(s, pref, SSL_SECOP_CURVE_SHARED))
374 continue;
375 if (nmatch == k) {
376 int id = (pref[0] << 8) | pref[1];
3e373518 377
ec24630a 378 return tls1_ec_curve_id2nid(id, NULL);
0f113f3e
MC		 379 }
380 k++;
381 }
382 }
383 }
384 if (nmatch == -1)
385 return k;
386 /* Out of range (nmatch > k). */
387 return NID_undef;
388}
d0595f17 389
de4d764e
MC		 390int tls1_set_groups(unsigned char **pext, size_t *pextlen,
391 int *groups, size_t ngroups)
0f113f3e 392{
de4d764e 393 unsigned char *glist, *p;
0f113f3e
MC		 394 size_t i;
395 /*
de4d764e 396 * Bitmap of groups included to detect duplicates: only works while group
0f113f3e
MC		 397 * ids < 32
398 */
399 unsigned long dup_list = 0;
de4d764e
MC		 400 glist = OPENSSL_malloc(ngroups * 2);
401 if (glist == NULL)
0f113f3e 402 return 0;
de4d764e 403 for (i = 0, p = glist; i < ngroups; i++) {
0f113f3e
MC		 404 unsigned long idmask;
405 int id;
de4d764e
MC		 406 /* TODO(TLS1.3): Convert for DH groups */
407 id = tls1_ec_nid2curve_id(groups[i]);
0f113f3e
MC		 408 idmask = 1L << id;
409 if (!id || (dup_list & idmask)) {
de4d764e 410 OPENSSL_free(glist);
0f113f3e
MC		 411 return 0;
412 }
413 dup_list |= idmask;
414 s2n(id, p);
415 }
b548a1f1 416 OPENSSL_free(*pext);
de4d764e
MC		 417 *pext = glist;
418 *pextlen = ngroups * 2;
0f113f3e
MC		 419 return 1;
420}
421
422# define MAX_CURVELIST 28
423
424typedef struct {
425 size_t nidcnt;
426 int nid_arr[MAX_CURVELIST];
427} nid_cb_st;
d0595f17
DSH		 428
429static int nid_cb(const char *elem, int len, void *arg)
0f113f3e
MC		 430{
431 nid_cb_st *narg = arg;
432 size_t i;
433 int nid;
434 char etmp[20];
2747d73c
KR		 435 if (elem == NULL)
436 return 0;
0f113f3e
MC		 437 if (narg->nidcnt == MAX_CURVELIST)
438 return 0;
439 if (len > (int)(sizeof(etmp) - 1))
440 return 0;
441 memcpy(etmp, elem, len);
442 etmp[len] = 0;
443 nid = EC_curve_nist2nid(etmp);
444 if (nid == NID_undef)
445 nid = OBJ_sn2nid(etmp);
446 if (nid == NID_undef)
447 nid = OBJ_ln2nid(etmp);
448 if (nid == NID_undef)
449 return 0;
450 for (i = 0; i < narg->nidcnt; i++)
451 if (narg->nid_arr[i] == nid)
452 return 0;
453 narg->nid_arr[narg->nidcnt++] = nid;
454 return 1;
455}
456
de4d764e
MC		 457/* Set groups based on a colon separate list */
458int tls1_set_groups_list(unsigned char **pext, size_t *pextlen, const char *str)
0f113f3e
MC		 459{
460 nid_cb_st ncb;
461 ncb.nidcnt = 0;
462 if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
463 return 0;
464 if (pext == NULL)
465 return 1;
de4d764e 466 return tls1_set_groups(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
0f113f3e
MC		 467}
468
fd2b65ce
DSH		 469/* For an EC key set TLS id and required compression based on parameters */
470static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
0f113f3e
MC		 471 EC_KEY *ec)
472{
2235b7f2 473 int id;
0f113f3e 474 const EC_GROUP *grp;
0f113f3e
MC		 475 if (!ec)
476 return 0;
477 /* Determine if it is a prime field */
478 grp = EC_KEY_get0_group(ec);
479 if (!grp)
480 return 0;
0f113f3e
MC		 481 /* Determine curve ID */
482 id = EC_GROUP_get_curve_name(grp);
483 id = tls1_ec_nid2curve_id(id);
2235b7f2
DSH		 484 /* If no id return error: we don't support arbitrary explicit curves */
485 if (id == 0)
486 return 0;
487 curve_id[0] = 0;
488 curve_id[1] = (unsigned char)id;
0f113f3e
MC		 489 if (comp_id) {
490 if (EC_KEY_get0_public_key(ec) == NULL)
491 return 0;
2235b7f2
DSH		 492 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_UNCOMPRESSED) {
493 *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
494 } else {
495 if ((nid_list[id - 1].flags & TLS_CURVE_TYPE) == TLS_CURVE_PRIME)
0f113f3e
MC		 496 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
497 else
498 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
2235b7f2 499 }
0f113f3e
MC		 500 }
501 return 1;
502}
503
fd2b65ce
DSH		 504/* Check an EC key is compatible with extensions */
505static int tls1_check_ec_key(SSL *s,
0f113f3e
MC		 506 unsigned char *curve_id, unsigned char *comp_id)
507{
508 const unsigned char *pformats, *pcurves;
509 size_t num_formats, num_curves, i;
510 int j;
511 /*
512 * If point formats extension present check it, otherwise everything is
513 * supported (see RFC4492).
514 */
aff8c126
RS		 515 if (comp_id && s->session->ext.ecpointformats) {
516 pformats = s->session->ext.ecpointformats;
517 num_formats = s->session->ext.ecpointformats_len;
0f113f3e
MC		 518 for (i = 0; i < num_formats; i++, pformats++) {
519 if (*comp_id == *pformats)
520 break;
521 }
522 if (i == num_formats)
523 return 0;
524 }
525 if (!curve_id)
526 return 1;
527 /* Check curve is consistent with client and server preferences */
528 for (j = 0; j <= 1; j++) {
529 if (!tls1_get_curvelist(s, j, &pcurves, &num_curves))
530 return 0;
b79d2410
MC		 531 if (j == 1 && num_curves == 0) {
532 /*
533 * If we've not received any curves then skip this check.
534 * RFC 4492 does not require the supported elliptic curves extension
535 * so if it is not sent we can just choose any curve.
536 * It is invalid to send an empty list in the elliptic curves
537 * extension, so num_curves == 0 always means no extension.
538 */
539 break;
540 }
0f113f3e
MC		 541 for (i = 0; i < num_curves; i++, pcurves += 2) {
542 if (pcurves[0] == curve_id[0] && pcurves[1] == curve_id[1])
543 break;
544 }
545 if (i == num_curves)
546 return 0;
547 /* For clients can only check sent curve list */
548 if (!s->server)
549 break;
550 }
551 return 1;
552}
d61ff83b 553
7da160b0
MC		 554void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
555 size_t *num_formats)
0f113f3e
MC		 556{
557 /*
558 * If we have a custom point format list use it otherwise use default
559 */
aff8c126
RS		 560 if (s->ext.ecpointformats) {
561 *pformats = s->ext.ecpointformats;
562 *num_formats = s->ext.ecpointformats_len;
0f113f3e
MC		 563 } else {
564 *pformats = ecformats_default;
565 /* For Suite B we don't support char2 fields */
566 if (tls1_suiteb(s))
567 *num_formats = sizeof(ecformats_default) - 1;
568 else
569 *num_formats = sizeof(ecformats_default);
570 }
571}
572
573/*
574 * Check cert parameters compatible with extensions: currently just checks EC
575 * certificates have compatible curves and compression.
d61ff83b 576 */
9195ddcd 577static int tls1_check_cert_param(SSL *s, X509 *x, int check_ee_md)
0f113f3e
MC		 578{
579 unsigned char comp_id, curve_id[2];
580 EVP_PKEY *pkey;
581 int rv;
8382fd3a 582 pkey = X509_get0_pubkey(x);
0f113f3e
MC		 583 if (!pkey)
584 return 0;
585 /* If not EC nothing to do */
3aeb9348 586 if (EVP_PKEY_id(pkey) != EVP_PKEY_EC)
0f113f3e 587 return 1;
3aeb9348 588 rv = tls1_set_ec_id(curve_id, &comp_id, EVP_PKEY_get0_EC_KEY(pkey));
0f113f3e
MC		 589 if (!rv)
590 return 0;
591 /*
592 * Can't check curve_id for client certs as we don't have a supported
593 * curves extension.
594 */
595 rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id);
596 if (!rv)
597 return 0;
598 /*
599 * Special case for suite B. We *MUST* sign using SHA256+P-256 or
9195ddcd 600 * SHA384+P-384.
0f113f3e 601 */
9195ddcd 602 if (check_ee_md && tls1_suiteb(s)) {
0f113f3e
MC		 603 int check_md;
604 size_t i;
605 CERT *c = s->cert;
606 if (curve_id[0])
607 return 0;
608 /* Check to see we have necessary signing algorithm */
609 if (curve_id[1] == TLSEXT_curve_P_256)
610 check_md = NID_ecdsa_with_SHA256;
611 else if (curve_id[1] == TLSEXT_curve_P_384)
612 check_md = NID_ecdsa_with_SHA384;
613 else
614 return 0; /* Should never happen */
615 for (i = 0; i < c->shared_sigalgslen; i++)
4d43ee28 616 if (check_md == c->shared_sigalgs[i]->sigandhash)
0f113f3e
MC		 617 break;
618 if (i == c->shared_sigalgslen)
619 return 0;
0f113f3e
MC		 620 }
621 return rv;
622}
623
6977e8ee 624/*
8483a003 625 * tls1_check_ec_tmp_key - Check EC temporary key compatibility
6977e8ee
KR		 626 * @s: SSL connection
627 * @cid: Cipher ID we're considering using
628 *
629 * Checks that the kECDHE cipher suite we're considering using
630 * is compatible with the client extensions.
631 *
632 * Returns 0 when the cipher can't be used or 1 when it can.
633 */
2ea80354 634int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
0f113f3e 635{
0f113f3e
MC		 636 /*
637 * If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other
638 * curves permitted.
639 */
640 if (tls1_suiteb(s)) {
6977e8ee 641 unsigned char curve_id[2];
0f113f3e
MC		 642 /* Curve to check determined by ciphersuite */
643 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
644 curve_id[1] = TLSEXT_curve_P_256;
645 else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
646 curve_id[1] = TLSEXT_curve_P_384;
647 else
648 return 0;
649 curve_id[0] = 0;
650 /* Check this curve is acceptable */
651 if (!tls1_check_ec_key(s, curve_id, NULL))
652 return 0;
fe6ef247 653 return 1;
0f113f3e 654 }
fe6ef247 655 /* Need a shared curve */
de4d764e 656 if (tls1_shared_group(s, 0))
fe6ef247 657 return 1;
6977e8ee 658 return 0;
0f113f3e 659}
d0595f17 660
14536c8c
DSH		 661#else
662
663static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
0f113f3e
MC		 664{
665 return 1;
666}
14536c8c 667
0f113f3e 668#endif /* OPENSSL_NO_EC */
f1fd4544 669
703bcee0 670/* Default sigalg schemes */
98c792d1 671static const uint16_t tls12_sigalgs[] = {
703bcee0
MC		 672#ifndef OPENSSL_NO_EC
673 TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
674 TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
675 TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
3d234c9e 676 TLSEXT_SIGALG_ed25519,
e481f9b9 677#endif
0f113f3e 678
536199ec
MC		 679 TLSEXT_SIGALG_rsa_pss_sha256,
680 TLSEXT_SIGALG_rsa_pss_sha384,
681 TLSEXT_SIGALG_rsa_pss_sha512,
682
703bcee0
MC		 683 TLSEXT_SIGALG_rsa_pkcs1_sha256,
684 TLSEXT_SIGALG_rsa_pkcs1_sha384,
685 TLSEXT_SIGALG_rsa_pkcs1_sha512,
0f113f3e 686
5eeb6c6e 687#ifndef OPENSSL_NO_EC
d8311fc9 688 TLSEXT_SIGALG_ecdsa_sha224,
42ab2230 689 TLSEXT_SIGALG_ecdsa_sha1,
5eeb6c6e 690#endif
d8311fc9 691 TLSEXT_SIGALG_rsa_pkcs1_sha224,
42ab2230 692 TLSEXT_SIGALG_rsa_pkcs1_sha1,
5eeb6c6e 693#ifndef OPENSSL_NO_DSA
d8311fc9 694 TLSEXT_SIGALG_dsa_sha224,
42ab2230
MC		 695 TLSEXT_SIGALG_dsa_sha1,
696
703bcee0
MC		 697 TLSEXT_SIGALG_dsa_sha256,
698 TLSEXT_SIGALG_dsa_sha384,
699 TLSEXT_SIGALG_dsa_sha512
5eeb6c6e 700#endif
fc101f88 701};
0f113f3e 702
e481f9b9 703#ifndef OPENSSL_NO_EC
98c792d1 704static const uint16_t suiteb_sigalgs[] = {
703bcee0
MC		 705 TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
706 TLSEXT_SIGALG_ecdsa_secp384r1_sha384
2ea80354 707};
e481f9b9 708#endif
aff8c126 709
7a531ee4 710static const SIGALG_LOOKUP sigalg_lookup_tbl[] = {
5eeb6c6e 711#ifndef OPENSSL_NO_EC
edbfba1a 712 {"ecdsa_secp256r1_sha256", TLSEXT_SIGALG_ecdsa_secp256r1_sha256,
17ae384e
DSH		 713 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
714 NID_ecdsa_with_SHA256, NID_X9_62_prime256v1},
edbfba1a 715 {"ecdsa_secp384r1_sha384", TLSEXT_SIGALG_ecdsa_secp384r1_sha384,
17ae384e
DSH		 716 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
717 NID_ecdsa_with_SHA384, NID_secp384r1},
edbfba1a 718 {"ecdsa_secp521r1_sha512", TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
17ae384e
DSH		 719 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
720 NID_ecdsa_with_SHA512, NID_secp521r1},
b04d4e38
DSH		 721 {"ed25519", TLSEXT_SIGALG_ed25519,
722 NID_undef, -1, NID_ED25519, SSL_PKEY_ED25519,
723 NID_undef, NID_undef},
d8311fc9
MC		 724 {NULL, TLSEXT_SIGALG_ecdsa_sha224,
725 NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
726 NID_ecdsa_with_SHA224, NID_undef},
edbfba1a 727 {NULL, TLSEXT_SIGALG_ecdsa_sha1,
17ae384e
DSH		 728 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_EC, SSL_PKEY_ECC,
729 NID_ecdsa_with_SHA1, NID_undef},
5eeb6c6e 730#endif
edbfba1a 731 {"rsa_pss_sha256", TLSEXT_SIGALG_rsa_pss_sha256,
17ae384e
DSH		 732 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
733 NID_undef, NID_undef},
edbfba1a 734 {"rsa_pss_sha384", TLSEXT_SIGALG_rsa_pss_sha384,
17ae384e
DSH		 735 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
736 NID_undef, NID_undef},
edbfba1a 737 {"rsa_pss_sha512", TLSEXT_SIGALG_rsa_pss_sha512,
17ae384e
DSH		 738 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA_PSS, SSL_PKEY_RSA_PSS_SIGN,
739 NID_undef, NID_undef},
edbfba1a 740 {"rsa_pkcs1_sha256", TLSEXT_SIGALG_rsa_pkcs1_sha256,
d0ff28f8 741 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
17ae384e 742 NID_sha256WithRSAEncryption, NID_undef},
edbfba1a 743 {"rsa_pkcs1_sha384", TLSEXT_SIGALG_rsa_pkcs1_sha384,
d0ff28f8 744 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
17ae384e 745 NID_sha384WithRSAEncryption, NID_undef},
edbfba1a 746 {"rsa_pkcs1_sha512", TLSEXT_SIGALG_rsa_pkcs1_sha512,
d0ff28f8 747 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
17ae384e 748 NID_sha512WithRSAEncryption, NID_undef},
d8311fc9
MC		 749 {"rsa_pkcs1_sha224", TLSEXT_SIGALG_rsa_pkcs1_sha224,
750 NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
751 NID_sha224WithRSAEncryption, NID_undef},
edbfba1a 752 {"rsa_pkcs1_sha1", TLSEXT_SIGALG_rsa_pkcs1_sha1,
d0ff28f8 753 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_RSA, SSL_PKEY_RSA,
17ae384e 754 NID_sha1WithRSAEncryption, NID_undef},
5eeb6c6e 755#ifndef OPENSSL_NO_DSA
edbfba1a 756 {NULL, TLSEXT_SIGALG_dsa_sha256,
17ae384e
DSH		 757 NID_sha256, SSL_MD_SHA256_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
758 NID_dsa_with_SHA256, NID_undef},
edbfba1a 759 {NULL, TLSEXT_SIGALG_dsa_sha384,
17ae384e
DSH		 760 NID_sha384, SSL_MD_SHA384_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
761 NID_undef, NID_undef},
edbfba1a 762 {NULL, TLSEXT_SIGALG_dsa_sha512,
17ae384e
DSH		 763 NID_sha512, SSL_MD_SHA512_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
764 NID_undef, NID_undef},
d8311fc9
MC		 765 {NULL, TLSEXT_SIGALG_dsa_sha224,
766 NID_sha224, SSL_MD_SHA224_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
767 NID_undef, NID_undef},
edbfba1a 768 {NULL, TLSEXT_SIGALG_dsa_sha1,
17ae384e
DSH		 769 NID_sha1, SSL_MD_SHA1_IDX, EVP_PKEY_DSA, SSL_PKEY_DSA_SIGN,
770 NID_dsaWithSHA1, NID_undef},
5eeb6c6e
MC		 771#endif
772#ifndef OPENSSL_NO_GOST
edbfba1a 773 {NULL, TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256,
17ae384e
DSH		 774 NID_id_GostR3411_2012_256, SSL_MD_GOST12_256_IDX,
775 NID_id_GostR3410_2012_256, SSL_PKEY_GOST12_256,
776 NID_undef, NID_undef},
edbfba1a 777 {NULL, TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512,
17ae384e
DSH		 778 NID_id_GostR3411_2012_512, SSL_MD_GOST12_512_IDX,
779 NID_id_GostR3410_2012_512, SSL_PKEY_GOST12_512,
780 NID_undef, NID_undef},
edbfba1a 781 {NULL, TLSEXT_SIGALG_gostr34102001_gostr3411,
17ae384e
DSH		 782 NID_id_GostR3411_94, SSL_MD_GOST94_IDX,
783 NID_id_GostR3410_2001, SSL_PKEY_GOST01,
784 NID_undef, NID_undef}
5eeb6c6e 785#endif
703bcee0 786};
0972bc5c
DSH		 787/* Legacy sigalgs for TLS < 1.2 RSA TLS signatures */
788static const SIGALG_LOOKUP legacy_rsa_sigalg = {
789 "rsa_pkcs1_md5_sha1", 0,
790 NID_md5_sha1, SSL_MD_MD5_SHA1_IDX,
791 EVP_PKEY_RSA, SSL_PKEY_RSA,
792 NID_undef, NID_undef
793};
794
795/*
796 * Default signature algorithm values used if signature algorithms not present.
797 * From RFC5246. Note: order must match certificate index order.
798 */
799static const uint16_t tls_default_sigalg[] = {
800 TLSEXT_SIGALG_rsa_pkcs1_sha1, /* SSL_PKEY_RSA */
801 TLSEXT_SIGALG_dsa_sha1, /* SSL_PKEY_DSA_SIGN */
802 TLSEXT_SIGALG_ecdsa_sha1, /* SSL_PKEY_ECC */
803 TLSEXT_SIGALG_gostr34102001_gostr3411, /* SSL_PKEY_GOST01 */
804 TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256, /* SSL_PKEY_GOST12_256 */
07afa3d8
DSH		 805 TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512, /* SSL_PKEY_GOST12_512 */
806 0 /* SSL_PKEY_ED25519 */
0972bc5c 807};
703bcee0 808
4d43ee28
DSH		 809/* Lookup TLS signature algorithm */
810static const SIGALG_LOOKUP *tls1_lookup_sigalg(uint16_t sigalg)
703bcee0
MC		 811{
812 size_t i;
4d43ee28 813 const SIGALG_LOOKUP *s;
703bcee0 814
4d43ee28
DSH		 815 for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
816 i++, s++) {
817 if (s->sigalg == sigalg)
818 return s;
703bcee0 819 }
4d43ee28
DSH		 820 return NULL;
821}
168067b6
DSH		 822/* Lookup hash: return 0 if invalid or not enabled */
823int tls1_lookup_md(const SIGALG_LOOKUP *lu, const EVP_MD **pmd)
824{
825 const EVP_MD *md;
826 if (lu == NULL)
827 return 0;
828 /* lu->hash == NID_undef means no associated digest */
829 if (lu->hash == NID_undef) {
830 md = NULL;
831 } else {
832 md = ssl_md(lu->hash_idx);
833 if (md == NULL)
834 return 0;
835 }
836 if (pmd)
837 *pmd = md;
838 return 1;
839}
840
0972bc5c
DSH		 841/*
842 * Return a signature algorithm for TLS < 1.2 where the signature type
843 * is fixed by the certificate type.
844 */
845static const SIGALG_LOOKUP *tls1_get_legacy_sigalg(const SSL *s, int idx)
846{
847 if (idx < 0 || idx >= (int)OSSL_NELEM(tls_default_sigalg))
848 return NULL;
849 if (SSL_USE_SIGALGS(s) || idx != SSL_PKEY_RSA) {
850 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(tls_default_sigalg[idx]);
851
168067b6 852 if (!tls1_lookup_md(lu, NULL))
0972bc5c 853 return NULL;
0972bc5c
DSH		 854 return lu;
855 }
856 return &legacy_rsa_sigalg;
857}
858/* Set peer sigalg based key type */
859int tls1_set_peer_legacy_sigalg(SSL *s, const EVP_PKEY *pkey)
860{
861 int idx = ssl_cert_type(NULL, pkey);
862
863 const SIGALG_LOOKUP *lu = tls1_get_legacy_sigalg(s, idx);
864 if (lu == NULL)
865 return 0;
866 s->s3->tmp.peer_sigalg = lu;
867 return 1;
868}
703bcee0 869
98c792d1 870size_t tls12_get_psigalgs(SSL *s, int sent, const uint16_t **psigs)
0f113f3e
MC		 871{
872 /*
873 * If Suite B mode use Suite B sigalgs only, ignore any other
874 * preferences.
875 */
e481f9b9 876#ifndef OPENSSL_NO_EC
0f113f3e
MC		 877 switch (tls1_suiteb(s)) {
878 case SSL_CERT_FLAG_SUITEB_128_LOS:
879 *psigs = suiteb_sigalgs;
7a531ee4 880 return OSSL_NELEM(suiteb_sigalgs);
0f113f3e
MC		 881
882 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
883 *psigs = suiteb_sigalgs;
7a531ee4 884 return 1;
0f113f3e
MC		 885
886 case SSL_CERT_FLAG_SUITEB_192_LOS:
7a531ee4
MC		 887 *psigs = suiteb_sigalgs + 1;
888 return 1;
0f113f3e 889 }
e481f9b9 890#endif
a9669ddc
DSH		 891 /*
892 * We use client_sigalgs (if not NULL) if we're a server
893 * and sending a certificate request or if we're a client and
894 * determining which shared algorithm to use.
895 */
896 if ((s->server == sent) && s->cert->client_sigalgs != NULL) {
0f113f3e
MC		 897 *psigs = s->cert->client_sigalgs;
898 return s->cert->client_sigalgslen;
899 } else if (s->cert->conf_sigalgs) {
900 *psigs = s->cert->conf_sigalgs;
901 return s->cert->conf_sigalgslen;
902 } else {
903 *psigs = tls12_sigalgs;
703bcee0 904 return OSSL_NELEM(tls12_sigalgs);
0f113f3e
MC		 905 }
906}
907
908/*
909 * Check signature algorithm is consistent with sent supported signature
b2eb6998
DSH		 910 * algorithms and if so set relevant digest and signature scheme in
911 * s.
ec4a50b3 912 */
f742cda8 913int tls12_check_peer_sigalg(SSL *s, uint16_t sig, EVP_PKEY *pkey)
0f113f3e 914{
98c792d1 915 const uint16_t *sent_sigs;
5554facb 916 const EVP_MD *md = NULL;
703bcee0 917 char sigalgstr[2];
0f113f3e 918 size_t sent_sigslen, i;
536199ec 919 int pkeyid = EVP_PKEY_id(pkey);
f742cda8 920 const SIGALG_LOOKUP *lu;
4d43ee28 921
0f113f3e 922 /* Should never happen */
536199ec 923 if (pkeyid == -1)
0f113f3e 924 return -1;
5a8916d9
DSH		 925 if (SSL_IS_TLS13(s)) {
926 /* Disallow DSA for TLS 1.3 */
927 if (pkeyid == EVP_PKEY_DSA) {
928 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
929 return 0;
930 }
931 /* Only allow PSS for TLS 1.3 */
932 if (pkeyid == EVP_PKEY_RSA)
933 pkeyid = EVP_PKEY_RSA_PSS;
934 }
f742cda8
DSH		 935 lu = tls1_lookup_sigalg(sig);
936 /*
d8311fc9
MC		 937 * Check sigalgs is known. Disallow SHA1/SHA224 with TLS 1.3. Check key type
938 * is consistent with signature: RSA keys can be used for RSA-PSS
f742cda8 939 */
d8311fc9
MC		 940 if (lu == NULL
941 || (SSL_IS_TLS13(s) && (lu->hash == NID_sha1 || lu->hash == NID_sha224))
095a982b 942 || (pkeyid != lu->sig
f742cda8 943 && (lu->sig != EVP_PKEY_RSA_PSS || pkeyid != EVP_PKEY_RSA))) {
0f113f3e
MC		 944 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
945 return 0;
946 }
e481f9b9 947#ifndef OPENSSL_NO_EC
fe3066ee 948 if (pkeyid == EVP_PKEY_EC) {
8f88cb53 949 EC_KEY *ec = EVP_PKEY_get0_EC_KEY(pkey);
f1adb006 950 int curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
44b6318f 951
8f88cb53 952 if (SSL_IS_TLS13(s)) {
e892e325
DSH		 953 if (EC_KEY_get_conv_form(ec) != POINT_CONVERSION_UNCOMPRESSED) {
954 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
955 SSL_R_ILLEGAL_POINT_COMPRESSION);
956 return 0;
957 }
8f88cb53 958 /* For TLS 1.3 check curve matches signature algorithm */
a34a9df0 959 if (lu->curve != NID_undef && curve != lu->curve) {
8f88cb53
DSH		 960 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
961 return 0;
962 }
963 } else {
964 unsigned char curve_id[2], comp_id;
44b6318f 965
8f88cb53
DSH		 966 /* Check compression and curve matches extensions */
967 if (!tls1_set_ec_id(curve_id, &comp_id, ec))
0f113f3e 968 return 0;
8f88cb53
DSH		 969 if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id)) {
970 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE);
971 return 0;
972 }
8f88cb53 973 if (tls1_suiteb(s)) {
f1adb006
DSH		 974 /* Check sigalg matches a permissible Suite B value */
975 if (sig != TLSEXT_SIGALG_ecdsa_secp256r1_sha256
976 && sig != TLSEXT_SIGALG_ecdsa_secp384r1_sha384) {
977 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
978 SSL_R_WRONG_SIGNATURE_TYPE);
0f113f3e 979 return 0;
f1adb006
DSH		 980 }
981 /*
982 * Suite B also requires P-256+SHA256 and P-384+SHA384:
983 * this matches the TLS 1.3 requirements so we can just
984 * check the curve is the expected TLS 1.3 value.
985 * If this fails an inappropriate digest is being used.
986 */
987 if (curve != lu->curve) {
988 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
989 SSL_R_ILLEGAL_SUITEB_DIGEST);
0f113f3e
MC		 990 return 0;
991 }
8f88cb53 992 }
0f113f3e 993 }
8f88cb53 994 } else if (tls1_suiteb(s)) {
0f113f3e 995 return 0;
8f88cb53 996 }
e481f9b9 997#endif
0f113f3e
MC		 998
999 /* Check signature matches a type we sent */
a9669ddc 1000 sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
536199ec 1001 for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
703bcee0 1002 if (sig == *sent_sigs)
0f113f3e
MC		 1003 break;
1004 }
1005 /* Allow fallback to SHA1 if not strict mode */
f742cda8
DSH		 1006 if (i == sent_sigslen && (lu->hash != NID_sha1
1007 || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) {
0f113f3e
MC		 1008 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
1009 return 0;
1010 }
168067b6
DSH		 1011 if (!tls1_lookup_md(lu, &md)) {
1012 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_UNKNOWN_DIGEST);
1013 return 0;
0f113f3e 1014 }
168067b6
DSH		 1015 if (md != NULL) {
1016 /*
1017 * Make sure security callback allows algorithm. For historical
1018 * reasons we have to pass the sigalg as a two byte char array.
1019 */
1020 sigalgstr[0] = (sig >> 8) & 0xff;
1021 sigalgstr[1] = sig & 0xff;
1022 if (!ssl_security(s, SSL_SECOP_SIGALG_CHECK,
1023 EVP_MD_size(md) * 4, EVP_MD_type(md),
1024 (void *)sigalgstr)) {
1025 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
1026 return 0;
1027 }
0f113f3e 1028 }
6cbebb55 1029 /* Store the sigalg the peer uses */
f742cda8 1030 s->s3->tmp.peer_sigalg = lu;
0f113f3e
MC		 1031 return 1;
1032}
2ea80354 1033
42ef7aea
DSH		 1034int SSL_get_peer_signature_type_nid(const SSL *s, int *pnid)
1035{
f742cda8 1036 if (s->s3->tmp.peer_sigalg == NULL)
42ef7aea 1037 return 0;
f742cda8 1038 *pnid = s->s3->tmp.peer_sigalg->sig;
42ef7aea
DSH		 1039 return 1;
1040}
1041
0f113f3e 1042/*
3eb2aff4
KR		 1043 * Set a mask of disabled algorithms: an algorithm is disabled if it isn't
1044 * supported, doesn't appear in supported signature algorithms, isn't supported
1045 * by the enabled protocol versions or by the security level.
1046 *
1047 * This function should only be used for checking which ciphers are supported
1048 * by the client.
1049 *
1050 * Call ssl_cipher_disabled() to check that it's enabled or not.
b7bfe69b
DSH		 1051 */
1052void ssl_set_client_disabled(SSL *s)
0f113f3e 1053{
4d69f9e6
DSH		 1054 s->s3->tmp.mask_a = 0;
1055 s->s3->tmp.mask_k = 0;
4d69f9e6 1056 ssl_set_sig_mask(&s->s3->tmp.mask_a, s, SSL_SECOP_SIGALG_MASK);
38a73150 1057 ssl_get_min_max_version(s, &s->s3->tmp.min_ver, &s->s3->tmp.max_ver);
a230b26e 1058#ifndef OPENSSL_NO_PSK
0f113f3e
MC		 1059 /* with PSK there must be client callback set */
1060 if (!s->psk_client_callback) {
4d69f9e6 1061 s->s3->tmp.mask_a |= SSL_aPSK;
fe5eef3a 1062 s->s3->tmp.mask_k |= SSL_PSK;
0f113f3e 1063 }
a230b26e 1064#endif /* OPENSSL_NO_PSK */
e481f9b9 1065#ifndef OPENSSL_NO_SRP
0f113f3e 1066 if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) {
4d69f9e6
DSH		 1067 s->s3->tmp.mask_a |= SSL_aSRP;
1068 s->s3->tmp.mask_k |= SSL_kSRP;
0f113f3e 1069 }
e481f9b9 1070#endif
0f113f3e 1071}
fc101f88 1072
3eb2aff4
KR		 1073/*
1074 * ssl_cipher_disabled - check that a cipher is disabled or not
1075 * @s: SSL connection that you want to use the cipher on
1076 * @c: cipher to check
1077 * @op: Security check that you want to do
8af91fd9 1078 * @ecdhe: If set to 1 then TLSv1 ECDHE ciphers are also allowed in SSLv3
3eb2aff4
KR		 1079 *
1080 * Returns 1 when it's disabled, 0 when enabled.
1081 */
8af91fd9 1082int ssl_cipher_disabled(SSL *s, const SSL_CIPHER *c, int op, int ecdhe)
0f113f3e 1083{
3eb2aff4 1084 if (c->algorithm_mkey & s->s3->tmp.mask_k
4d69f9e6 1085 || c->algorithm_auth & s->s3->tmp.mask_a)
0f113f3e 1086 return 1;
3eb2aff4
KR		 1087 if (s->s3->tmp.max_ver == 0)
1088 return 1;
8af91fd9
MC		 1089 if (!SSL_IS_DTLS(s)) {
1090 int min_tls = c->min_tls;
1091
1092 /*
1093 * For historical reasons we will allow ECHDE to be selected by a server
1094 * in SSLv3 if we are a client
1095 */
1096 if (min_tls == TLS1_VERSION && ecdhe
1097 && (c->algorithm_mkey & (SSL_kECDHE | SSL_kECDHEPSK)) != 0)
1098 min_tls = SSL3_VERSION;
1099
1100 if ((min_tls > s->s3->tmp.max_ver) || (c->max_tls < s->s3->tmp.min_ver))
1101 return 1;
1102 }
3eb2aff4 1103 if (SSL_IS_DTLS(s) && (DTLS_VERSION_GT(c->min_dtls, s->s3->tmp.max_ver)
a230b26e 1104 || DTLS_VERSION_LT(c->max_dtls, s->s3->tmp.min_ver)))
3eb2aff4
KR		 1105 return 1;
1106
0f113f3e
MC		 1107 return !ssl_security(s, op, c->strength_bits, 0, (void *)c);
1108}
b362ccab 1109
7da160b0 1110int tls_use_ticket(SSL *s)
0f113f3e 1111{
08191294 1112 if ((s->options & SSL_OP_NO_TICKET))
0f113f3e
MC		 1113 return 0;
1114 return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
1115}
ed3883d2 1116
e469af8d 1117int tls1_set_server_sigalgs(SSL *s)
0f113f3e
MC		 1118{
1119 int al;
1120 size_t i;
8483a003
F		 1121
1122 /* Clear any shared signature algorithms */
b548a1f1
RS		 1123 OPENSSL_free(s->cert->shared_sigalgs);
1124 s->cert->shared_sigalgs = NULL;
1125 s->cert->shared_sigalgslen = 0;
9195ddcd
DSH		 1126 /* Clear certificate validity flags */
1127 for (i = 0; i < SSL_PKEY_NUM; i++)
6383d316 1128 s->s3->tmp.valid_flags[i] = 0;
a8bb912d
DSH		 1129 /*
1130 * If peer sent no signature algorithms check to see if we support
1131 * the default algorithm for each certificate type
1132 */
1133 if (s->s3->tmp.peer_sigalgs == NULL) {
1134 const uint16_t *sent_sigs;
1135 size_t sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
0f113f3e 1136
a8bb912d
DSH		 1137 for (i = 0; i < SSL_PKEY_NUM; i++) {
1138 const SIGALG_LOOKUP *lu = tls1_get_legacy_sigalg(s, i);
1139 size_t j;
1140
1141 if (lu == NULL)
1142 continue;
1143 /* Check default matches a type we sent */
1144 for (j = 0; j < sent_sigslen; j++) {
1145 if (lu->sigalg == sent_sigs[j]) {
1146 s->s3->tmp.valid_flags[i] = CERT_PKEY_SIGN;
1147 break;
1148 }
1149 }
1150 }
9195ddcd 1151 return 1;
a8bb912d 1152 }
9195ddcd
DSH		 1153
1154 if (!tls1_process_sigalgs(s)) {
1155 SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS, ERR_R_MALLOC_FAILURE);
1156 al = SSL_AD_INTERNAL_ERROR;
1157 goto err;
d376e57d 1158 }
9195ddcd
DSH		 1159 if (s->cert->shared_sigalgs != NULL)
1160 return 1;
fb34a0f4 1161 /* Fatal error if no shared signature algorithms */
9195ddcd 1162 SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS, SSL_R_NO_SHARED_SIGNATURE_ALGORITHMS);
fb34a0f4 1163 al = SSL_AD_HANDSHAKE_FAILURE;
0f113f3e
MC		 1164 err:
1165 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1166 return 0;
1167}
e469af8d 1168
1d97c843 1169/*-
1ab3836b 1170 * Gets the ticket information supplied by the client if any.
e7f0d921 1171 *
1ab3836b 1172 * hello: The parsed ClientHello data
c519e89f
BM		 1173 * ret: (output) on return, if a ticket was decrypted, then this is set to
1174 * point to the resulting session.
1175 *
1176 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
1177 * ciphersuite, in which case we have no use for session tickets and one will
aff8c126 1178 * never be decrypted, nor will s->ext.ticket_expected be set to 1.
c519e89f
BM		 1179 *
1180 * Returns:
1181 * -1: fatal error, either from parsing or decrypting the ticket.
1182 * 0: no ticket was found (or was ignored, based on settings).
1183 * 1: a zero length extension was found, indicating that the client supports
1184 * session tickets but doesn't currently have one to offer.
1185 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
1186 * couldn't be decrypted because of a non-fatal error.
1187 * 3: a ticket was successfully decrypted and *ret was set.
1188 *
1189 * Side effects:
aff8c126 1190 * Sets s->ext.ticket_expected to 1 if the server will have to issue
c519e89f
BM		 1191 * a new session ticket to the client because the client indicated support
1192 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
1193 * a session ticket or we couldn't use the one it gave us, or if
aff8c126
RS		 1194 * s->ctx->ext.ticket_key_cb asked to renew the client's ticket.
1195 * Otherwise, s->ext.ticket_expected is set to 0.
6434abbf 1196 */
ddf6ec00
MC		 1197TICKET_RETURN tls_get_ticket_from_client(SSL *s, CLIENTHELLO_MSG *hello,
1198 SSL_SESSION **ret)
0f113f3e 1199{
1ab3836b 1200 int retv;
1ab3836b
MC		 1201 size_t size;
1202 RAW_EXTENSION *ticketext;
e7f0d921 1203
0f113f3e 1204 *ret = NULL;
aff8c126 1205 s->ext.ticket_expected = 0;
0f113f3e
MC		 1206
1207 /*
9362c93e
MC		 1208 * If tickets disabled or not supported by the protocol version
1209 * (e.g. TLSv1.3) behave as if no ticket present to permit stateful
0f113f3e
MC		 1210 * resumption.
1211 */
1ab3836b 1212 if (s->version <= SSL3_VERSION || !tls_use_ticket(s))
ddf6ec00 1213 return TICKET_NONE;
9ceb2426 1214
70af3d8e
MC		 1215 ticketext = &hello->pre_proc_exts[TLSEXT_IDX_session_ticket];
1216 if (!ticketext->present)
ddf6ec00 1217 return TICKET_NONE;
1ab3836b
MC		 1218
1219 size = PACKET_remaining(&ticketext->data);
1220 if (size == 0) {
1221 /*
1222 * The client will accept a ticket but doesn't currently have
1223 * one.
1224 */
aff8c126 1225 s->ext.ticket_expected = 1;
ddf6ec00 1226 return TICKET_EMPTY;
9ceb2426 1227 }
aff8c126 1228 if (s->ext.session_secret_cb) {
1ab3836b
MC		 1229 /*
1230 * Indicate that the ticket couldn't be decrypted rather than
1231 * generating the session from ticket now, trigger
1232 * abbreviated handshake based on external mechanism to
1233 * calculate the master secret later.
1234 */
ddf6ec00 1235 return TICKET_NO_DECRYPT;
1ab3836b 1236 }
70af3d8e
MC		 1237
1238 retv = tls_decrypt_ticket(s, PACKET_data(&ticketext->data), size,
1239 hello->session_id, hello->session_id_len, ret);
1ab3836b 1240 switch (retv) {
61c32649 1241 case TICKET_NO_DECRYPT:
aff8c126 1242 s->ext.ticket_expected = 1;
ddf6ec00 1243 return TICKET_NO_DECRYPT;
9ceb2426 1244
61c32649 1245 case TICKET_SUCCESS:
ddf6ec00 1246 return TICKET_SUCCESS;
9ceb2426 1247
61c32649 1248 case TICKET_SUCCESS_RENEW:
aff8c126 1249 s->ext.ticket_expected = 1;
ddf6ec00 1250 return TICKET_SUCCESS;
e7f0d921 1251
61c32649 1252 default:
ddf6ec00 1253 return TICKET_FATAL_ERR_OTHER;
0f113f3e 1254 }
1ab3836b
MC		 1255}
1256
1d97c843
TH		 1257/*-
1258 * tls_decrypt_ticket attempts to decrypt a session ticket.
c519e89f
BM		 1259 *
1260 * etick: points to the body of the session ticket extension.
8483a003 1261 * eticklen: the length of the session tickets extension.
c519e89f
BM		 1262 * sess_id: points at the session ID.
1263 * sesslen: the length of the session ID.
1264 * psess: (output) on return, if a ticket was decrypted, then this is set to
1265 * point to the resulting session.
c519e89f 1266 */
ddf6ec00
MC		 1267TICKET_RETURN tls_decrypt_ticket(SSL *s, const unsigned char *etick,
1268 size_t eticklen, const unsigned char *sess_id,
1269 size_t sesslen, SSL_SESSION **psess)
0f113f3e
MC		 1270{
1271 SSL_SESSION *sess;
1272 unsigned char *sdec;
1273 const unsigned char *p;
ddf6ec00
MC		 1274 int slen, renew_ticket = 0, declen;
1275 TICKET_RETURN ret = TICKET_FATAL_ERR_OTHER;
348240c6 1276 size_t mlen;
0f113f3e 1277 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
bf7c6817 1278 HMAC_CTX *hctx = NULL;
846ec07d 1279 EVP_CIPHER_CTX *ctx;
222da979 1280 SSL_CTX *tctx = s->session_ctx;
e97763c9 1281
0f113f3e 1282 /* Initialize session ticket encryption and HMAC contexts */
bf7c6817
RL		 1283 hctx = HMAC_CTX_new();
1284 if (hctx == NULL)
1053a6e2 1285 return TICKET_FATAL_ERR_MALLOC;
846ec07d 1286 ctx = EVP_CIPHER_CTX_new();
35b1a433 1287 if (ctx == NULL) {
1053a6e2 1288 ret = TICKET_FATAL_ERR_MALLOC;
35b1a433
MC		 1289 goto err;
1290 }
aff8c126 1291 if (tctx->ext.ticket_key_cb) {
0f113f3e 1292 unsigned char *nctick = (unsigned char *)etick;
aff8c126 1293 int rv = tctx->ext.ticket_key_cb(s, nctick, nctick + 16,
846ec07d 1294 ctx, hctx, 0);
0f113f3e 1295 if (rv < 0)
35b1a433
MC		 1296 goto err;
1297 if (rv == 0) {
1053a6e2 1298 ret = TICKET_NO_DECRYPT;
35b1a433
MC		 1299 goto err;
1300 }
0f113f3e
MC		 1301 if (rv == 2)
1302 renew_ticket = 1;
1303 } else {
1304 /* Check key name matches */
aff8c126
RS		 1305 if (memcmp(etick, tctx->ext.tick_key_name,
1306 sizeof(tctx->ext.tick_key_name)) != 0) {
1053a6e2 1307 ret = TICKET_NO_DECRYPT;
35b1a433
MC		 1308 goto err;
1309 }
aff8c126
RS		 1310 if (HMAC_Init_ex(hctx, tctx->ext.tick_hmac_key,
1311 sizeof(tctx->ext.tick_hmac_key),
5f3d93e4 1312 EVP_sha256(), NULL) <= 0
a230b26e 1313 || EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL,
aff8c126 1314 tctx->ext.tick_aes_key,
1053a6e2
MC		 1315 etick
1316 + sizeof(tctx->ext.tick_key_name)) <= 0) {
5f3d93e4 1317 goto err;
a230b26e 1318 }
0f113f3e
MC		 1319 }
1320 /*
1321 * Attempt to process session ticket, first conduct sanity and integrity
1322 * checks on ticket.
1323 */
bf7c6817 1324 mlen = HMAC_size(hctx);
348240c6 1325 if (mlen == 0) {
5f3d93e4 1326 goto err;
0f113f3e 1327 }
e97763c9
DSH		 1328 /* Sanity check ticket length: must exceed keyname + IV + HMAC */
1329 if (eticklen <=
348240c6 1330 TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx) + mlen) {
1053a6e2 1331 ret = TICKET_NO_DECRYPT;
e97763c9
DSH		 1332 goto err;
1333 }
0f113f3e
MC		 1334 eticklen -= mlen;
1335 /* Check HMAC of encrypted ticket */
bf7c6817 1336 if (HMAC_Update(hctx, etick, eticklen) <= 0
a230b26e 1337 || HMAC_Final(hctx, tick_hmac, NULL) <= 0) {
5f3d93e4
MC		 1338 goto err;
1339 }
bf7c6817 1340 HMAC_CTX_free(hctx);
0f113f3e 1341 if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) {
846ec07d 1342 EVP_CIPHER_CTX_free(ctx);
1053a6e2 1343 return TICKET_NO_DECRYPT;
0f113f3e
MC		 1344 }
1345 /* Attempt to decrypt session data */
1346 /* Move p after IV to start of encrypted ticket, update length */
57b0d651
BE		 1347 p = etick + TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
1348 eticklen -= TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx);
0f113f3e 1349 sdec = OPENSSL_malloc(eticklen);
348240c6
MC		 1350 if (sdec == NULL || EVP_DecryptUpdate(ctx, sdec, &slen, p,
1351 (int)eticklen) <= 0) {
846ec07d 1352 EVP_CIPHER_CTX_free(ctx);
d1247df2 1353 OPENSSL_free(sdec);
1053a6e2 1354 return TICKET_FATAL_ERR_OTHER;
0f113f3e 1355 }
348240c6 1356 if (EVP_DecryptFinal(ctx, sdec + slen, &declen) <= 0) {
846ec07d 1357 EVP_CIPHER_CTX_free(ctx);
0f113f3e 1358 OPENSSL_free(sdec);
1053a6e2 1359 return TICKET_NO_DECRYPT;
0f113f3e 1360 }
348240c6 1361 slen += declen;
846ec07d
RL		 1362 EVP_CIPHER_CTX_free(ctx);
1363 ctx = NULL;
0f113f3e
MC		 1364 p = sdec;
1365
1366 sess = d2i_SSL_SESSION(NULL, &p, slen);
d3bc9805 1367 slen -= p - sdec;
0f113f3e
MC		 1368 OPENSSL_free(sdec);
1369 if (sess) {
79020b27 1370 /* Some additional consistency checks */
d3bc9805 1371 if (slen != 0 || sess->session_id_length != 0) {
79020b27 1372 SSL_SESSION_free(sess);
0b1f2664 1373 return TICKET_NO_DECRYPT;
79020b27 1374 }
0f113f3e
MC		 1375 /*
1376 * The session ID, if non-empty, is used by some clients to detect
1377 * that the ticket has been accepted. So we copy it to the session
1378 * structure. If it is empty set length to zero as required by
1379 * standard.
1380 */
1381 if (sesslen)
1382 memcpy(sess->session_id, sess_id, sesslen);
1383 sess->session_id_length = sesslen;
1384 *psess = sess;
1385 if (renew_ticket)
1053a6e2 1386 return TICKET_SUCCESS_RENEW;
0f113f3e 1387 else
1053a6e2 1388 return TICKET_SUCCESS;
0f113f3e
MC		 1389 }
1390 ERR_clear_error();
1391 /*
1392 * For session parse failure, indicate that we need to send a new ticket.
1393 */
1053a6e2 1394 return TICKET_NO_DECRYPT;
a230b26e 1395 err:
846ec07d 1396 EVP_CIPHER_CTX_free(ctx);
bf7c6817 1397 HMAC_CTX_free(hctx);
35b1a433 1398 return ret;
0f113f3e 1399}
6434abbf 1400
536199ec 1401static int tls12_get_pkey_idx(int sig_nid)
0f113f3e 1402{
536199ec 1403 switch (sig_nid) {
e481f9b9 1404#ifndef OPENSSL_NO_RSA
536199ec 1405 case EVP_PKEY_RSA:
d0ff28f8 1406 return SSL_PKEY_RSA;
b2eb6998
DSH		 1407 /*
1408 * For now return RSA key for PSS. When we support PSS only keys
1409 * this will need to be updated.
1410 */
1411 case EVP_PKEY_RSA_PSS:
d0ff28f8 1412 return SSL_PKEY_RSA;
e481f9b9
MC		 1413#endif
1414#ifndef OPENSSL_NO_DSA
536199ec 1415 case EVP_PKEY_DSA:
0f113f3e 1416 return SSL_PKEY_DSA_SIGN;
e481f9b9
MC		 1417#endif
1418#ifndef OPENSSL_NO_EC
536199ec 1419 case EVP_PKEY_EC:
0f113f3e 1420 return SSL_PKEY_ECC;
07afa3d8
DSH		 1421 case NID_ED25519:
1422 return SSL_PKEY_ED25519;
e481f9b9 1423#endif
a230b26e 1424#ifndef OPENSSL_NO_GOST
536199ec 1425 case NID_id_GostR3410_2001:
e44380a9
DB		 1426 return SSL_PKEY_GOST01;
1427
536199ec 1428 case NID_id_GostR3410_2012_256:
e44380a9
DB		 1429 return SSL_PKEY_GOST12_256;
1430
536199ec 1431 case NID_id_GostR3410_2012_512:
e44380a9 1432 return SSL_PKEY_GOST12_512;
a230b26e 1433#endif
0f113f3e
MC		 1434 }
1435 return -1;
1436}
4453cd8c 1437
b362ccab 1438/* Check to see if a signature algorithm is allowed */
b0e9ab95 1439static int tls12_sigalg_allowed(SSL *s, int op, const SIGALG_LOOKUP *lu)
0f113f3e 1440{
703bcee0 1441 unsigned char sigalgstr[2];
44b6318f 1442 int secbits;
703bcee0 1443
44b6318f 1444 /* See if sigalgs is recognised and if hash is enabled */
168067b6 1445 if (!tls1_lookup_md(lu, NULL))
0f113f3e 1446 return 0;
224b4e37
DSH		 1447 /* DSA is not allowed in TLS 1.3 */
1448 if (SSL_IS_TLS13(s) && lu->sig == EVP_PKEY_DSA)
1449 return 0;
0f113f3e 1450 /* See if public key algorithm allowed */
44b6318f 1451 if (tls12_get_pkey_idx(lu->sig) == -1)
0f113f3e 1452 return 0;
168067b6
DSH		 1453 if (lu->hash == NID_undef)
1454 return 1;
44b6318f
DSH		 1455 /* Security bits: half digest bits */
1456 secbits = EVP_MD_size(ssl_md(lu->hash_idx)) * 4;
0f113f3e 1457 /* Finally see if security callback allows it */
b0e9ab95
DSH		 1458 sigalgstr[0] = (lu->sigalg >> 8) & 0xff;
1459 sigalgstr[1] = lu->sigalg & 0xff;
44b6318f 1460 return ssl_security(s, op, secbits, lu->hash, (void *)sigalgstr);
0f113f3e
MC		 1461}
1462
1463/*
1464 * Get a mask of disabled public key algorithms based on supported signature
1465 * algorithms. For example if no signature algorithm supports RSA then RSA is
1466 * disabled.
b362ccab
DSH		 1467 */
1468
90d9e49a 1469void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op)
0f113f3e 1470{
98c792d1 1471 const uint16_t *sigalgs;
0f113f3e
MC		 1472 size_t i, sigalgslen;
1473 int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
1474 /*
1475 * Now go through all signature algorithms seeing if we support any for
1476 * RSA, DSA, ECDSA. Do this for all versions not just TLS 1.2. To keep
1477 * down calls to security callback only check if we have to.
1478 */
a9669ddc 1479 sigalgslen = tls12_get_psigalgs(s, 1, &sigalgs);
703bcee0 1480 for (i = 0; i < sigalgslen; i ++, sigalgs++) {
b0e9ab95
DSH		 1481 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*sigalgs);
1482
1483 if (lu == NULL)
1484 continue;
1485 switch (lu->sig) {
e481f9b9 1486#ifndef OPENSSL_NO_RSA
b2eb6998
DSH		 1487 /* Any RSA-PSS signature algorithms also mean we allow RSA */
1488 case EVP_PKEY_RSA_PSS:
536199ec 1489 case EVP_PKEY_RSA:
b0e9ab95 1490 if (!have_rsa && tls12_sigalg_allowed(s, op, lu))
0f113f3e
MC		 1491 have_rsa = 1;
1492 break;
e481f9b9
MC		 1493#endif
1494#ifndef OPENSSL_NO_DSA
536199ec 1495 case EVP_PKEY_DSA:
b0e9ab95 1496 if (!have_dsa && tls12_sigalg_allowed(s, op, lu))
0f113f3e
MC		 1497 have_dsa = 1;
1498 break;
e481f9b9
MC		 1499#endif
1500#ifndef OPENSSL_NO_EC
b2021556 1501 case NID_ED25519:
536199ec 1502 case EVP_PKEY_EC:
b0e9ab95 1503 if (!have_ecdsa && tls12_sigalg_allowed(s, op, lu))
0f113f3e
MC		 1504 have_ecdsa = 1;
1505 break;
e481f9b9 1506#endif
0f113f3e
MC		 1507 }
1508 }
1509 if (!have_rsa)
1510 *pmask_a |= SSL_aRSA;
1511 if (!have_dsa)
1512 *pmask_a |= SSL_aDSS;
1513 if (!have_ecdsa)
1514 *pmask_a |= SSL_aECDSA;
1515}
b362ccab 1516
ae2f7b37 1517int tls12_copy_sigalgs(SSL *s, WPACKET *pkt,
98c792d1 1518 const uint16_t *psig, size_t psiglen)
2c7b4dbc
MC		 1519{
1520 size_t i;
b0e9ab95 1521 int rv = 0;
c0f9e23c 1522
703bcee0 1523 for (i = 0; i < psiglen; i++, psig++) {
b0e9ab95
DSH		 1524 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*psig);
1525
1526 if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, lu))
1527 continue;
1528 if (!WPACKET_put_bytes_u16(pkt, *psig))
1529 return 0;
1530 /*
1531 * If TLS 1.3 must have at least one valid TLS 1.3 message
d8311fc9 1532 * signing algorithm: i.e. neither RSA nor SHA1/SHA224
b0e9ab95
DSH		 1533 */
1534 if (rv == 0 && (!SSL_IS_TLS13(s)
d8311fc9
MC		 1535 || (lu->sig != EVP_PKEY_RSA
1536 && lu->hash != NID_sha1
1537 && lu->hash != NID_sha224)))
b0e9ab95 1538 rv = 1;
2c7b4dbc 1539 }
5528d68f
DSH		 1540 if (rv == 0)
1541 SSLerr(SSL_F_TLS12_COPY_SIGALGS, SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
b0e9ab95 1542 return rv;
2c7b4dbc
MC		 1543}
1544
4453cd8c 1545/* Given preference and allowed sigalgs set shared sigalgs */
4d43ee28 1546static size_t tls12_shared_sigalgs(SSL *s, const SIGALG_LOOKUP **shsig,
98c792d1
DSH		 1547 const uint16_t *pref, size_t preflen,
1548 const uint16_t *allow, size_t allowlen)
0f113f3e 1549{
98c792d1 1550 const uint16_t *ptmp, *atmp;
0f113f3e 1551 size_t i, j, nmatch = 0;
703bcee0 1552 for (i = 0, ptmp = pref; i < preflen; i++, ptmp++) {
b0e9ab95
DSH		 1553 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*ptmp);
1554
0f113f3e 1555 /* Skip disabled hashes or signature algorithms */
b0e9ab95 1556 if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, lu))
0f113f3e 1557 continue;
703bcee0
MC		 1558 for (j = 0, atmp = allow; j < allowlen; j++, atmp++) {
1559 if (*ptmp == *atmp) {
0f113f3e 1560 nmatch++;
b0e9ab95
DSH		 1561 if (shsig)
1562 *shsig++ = lu;
0f113f3e
MC		 1563 break;
1564 }
1565 }
1566 }
1567 return nmatch;
1568}
4453cd8c
DSH		 1569
1570/* Set shared signature algorithms for SSL structures */
1571static int tls1_set_shared_sigalgs(SSL *s)
0f113f3e 1572{
98c792d1 1573 const uint16_t *pref, *allow, *conf;
0f113f3e
MC		 1574 size_t preflen, allowlen, conflen;
1575 size_t nmatch;
4d43ee28 1576 const SIGALG_LOOKUP **salgs = NULL;
0f113f3e
MC		 1577 CERT *c = s->cert;
1578 unsigned int is_suiteb = tls1_suiteb(s);
b548a1f1
RS		 1579
1580 OPENSSL_free(c->shared_sigalgs);
1581 c->shared_sigalgs = NULL;
1582 c->shared_sigalgslen = 0;
0f113f3e
MC		 1583 /* If client use client signature algorithms if not NULL */
1584 if (!s->server && c->client_sigalgs && !is_suiteb) {
1585 conf = c->client_sigalgs;
1586 conflen = c->client_sigalgslen;
1587 } else if (c->conf_sigalgs && !is_suiteb) {
1588 conf = c->conf_sigalgs;
1589 conflen = c->conf_sigalgslen;
1590 } else
a9669ddc 1591 conflen = tls12_get_psigalgs(s, 0, &conf);
0f113f3e
MC		 1592 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb) {
1593 pref = conf;
1594 preflen = conflen;
76106e60
DSH		 1595 allow = s->s3->tmp.peer_sigalgs;
1596 allowlen = s->s3->tmp.peer_sigalgslen;
0f113f3e
MC		 1597 } else {
1598 allow = conf;
1599 allowlen = conflen;
76106e60
DSH		 1600 pref = s->s3->tmp.peer_sigalgs;
1601 preflen = s->s3->tmp.peer_sigalgslen;
0f113f3e
MC		 1602 }
1603 nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen);
34e3edbf 1604 if (nmatch) {
4d43ee28 1605 salgs = OPENSSL_malloc(nmatch * sizeof(*salgs));
a71edf3b 1606 if (salgs == NULL)
34e3edbf
DSH		 1607 return 0;
1608 nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen);
1609 } else {
1610 salgs = NULL;
1611 }
0f113f3e
MC		 1612 c->shared_sigalgs = salgs;
1613 c->shared_sigalgslen = nmatch;
1614 return 1;
1615}
4453cd8c 1616
6b7be581
DSH		 1617/* Set preferred digest for each key type */
1618
703bcee0 1619int tls1_save_sigalgs(SSL *s, PACKET *pkt)
0f113f3e
MC		 1620{
1621 CERT *c = s->cert;
98c792d1 1622 unsigned int stmp;
703bcee0
MC		 1623 size_t size, i;
1624
0f113f3e
MC		 1625 /* Extension ignored for inappropriate versions */
1626 if (!SSL_USE_SIGALGS(s))
1627 return 1;
1628 /* Should never happen */
1629 if (!c)
1630 return 0;
1631
703bcee0
MC		 1632 size = PACKET_remaining(pkt);
1633
1634 /* Invalid data length */
8f12296e 1635 if (size == 0 || (size & 1) != 0)
703bcee0
MC		 1636 return 0;
1637
1638 size >>= 1;
1639
76106e60 1640 OPENSSL_free(s->s3->tmp.peer_sigalgs);
536199ec
MC		 1641 s->s3->tmp.peer_sigalgs = OPENSSL_malloc(size
1642 * sizeof(*s->s3->tmp.peer_sigalgs));
76106e60 1643 if (s->s3->tmp.peer_sigalgs == NULL)
0f113f3e 1644 return 0;
703bcee0 1645 s->s3->tmp.peer_sigalgslen = size;
98c792d1
DSH		 1646 for (i = 0; i < size && PACKET_get_net_2(pkt, &stmp); i++)
1647 s->s3->tmp.peer_sigalgs[i] = stmp;
703bcee0
MC		 1648
1649 if (i != size)
1650 return 0;
1651
0f113f3e
MC		 1652 return 1;
1653}
6b7be581 1654
c800c27a 1655int tls1_process_sigalgs(SSL *s)
0f113f3e 1656{
0f113f3e 1657 size_t i;
f7d53487 1658 uint32_t *pvalid = s->s3->tmp.valid_flags;
0f113f3e 1659 CERT *c = s->cert;
4d43ee28 1660
0f113f3e
MC		 1661 if (!tls1_set_shared_sigalgs(s))
1662 return 0;
1663
9195ddcd
DSH		 1664 for (i = 0; i < SSL_PKEY_NUM; i++)
1665 pvalid[i] = 0;
1666
4d43ee28
DSH		 1667 for (i = 0; i < c->shared_sigalgslen; i++) {
1668 const SIGALG_LOOKUP *sigptr = c->shared_sigalgs[i];
9195ddcd 1669 int idx = sigptr->sig_idx;
4d43ee28 1670
523fb323 1671 /* Ignore PKCS1 based sig algs in TLSv1.3 */
4d43ee28 1672 if (SSL_IS_TLS13(s) && sigptr->sig == EVP_PKEY_RSA)
523fb323 1673 continue;
9195ddcd
DSH		 1674 /* If not disabled indicate we can explicitly sign */
1675 if (pvalid[idx] == 0 && tls12_get_pkey_idx(sigptr->sig) != -1)
a8bb912d 1676 pvalid[sigptr->sig_idx] = CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
0f113f3e
MC		 1677 }
1678 return 1;
1679}
4817504d 1680
e7f8ff43 1681int SSL_get_sigalgs(SSL *s, int idx,
0f113f3e
MC		 1682 int *psign, int *phash, int *psignhash,
1683 unsigned char *rsig, unsigned char *rhash)
1684{
98c792d1 1685 uint16_t *psig = s->s3->tmp.peer_sigalgs;
703bcee0 1686 size_t numsigalgs = s->s3->tmp.peer_sigalgslen;
348240c6 1687 if (psig == NULL || numsigalgs > INT_MAX)
0f113f3e
MC		 1688 return 0;
1689 if (idx >= 0) {
4d43ee28
DSH		 1690 const SIGALG_LOOKUP *lu;
1691
703bcee0 1692 if (idx >= (int)numsigalgs)
0f113f3e
MC		 1693 return 0;
1694 psig += idx;
4d43ee28 1695 if (rhash != NULL)
536199ec 1696 *rhash = (unsigned char)((*psig >> 8) & 0xff);
4d43ee28 1697 if (rsig != NULL)
536199ec 1698 *rsig = (unsigned char)(*psig & 0xff);
4d43ee28
DSH		 1699 lu = tls1_lookup_sigalg(*psig);
1700 if (psign != NULL)
1701 *psign = lu != NULL ? lu->sig : NID_undef;
1702 if (phash != NULL)
1703 *phash = lu != NULL ? lu->hash : NID_undef;
1704 if (psignhash != NULL)
1705 *psignhash = lu != NULL ? lu->sigandhash : NID_undef;
0f113f3e 1706 }
348240c6 1707 return (int)numsigalgs;
0f113f3e 1708}
4453cd8c
DSH		 1709
1710int SSL_get_shared_sigalgs(SSL *s, int idx,
0f113f3e
MC		 1711 int *psign, int *phash, int *psignhash,
1712 unsigned char *rsig, unsigned char *rhash)
1713{
4d43ee28
DSH		 1714 const SIGALG_LOOKUP *shsigalgs;
1715 if (s->cert->shared_sigalgs == NULL
6d047e06 1716 || idx < 0
4d43ee28
DSH		 1717 || idx >= (int)s->cert->shared_sigalgslen
1718 || s->cert->shared_sigalgslen > INT_MAX)
0f113f3e 1719 return 0;
4d43ee28
DSH		 1720 shsigalgs = s->cert->shared_sigalgs[idx];
1721 if (phash != NULL)
1722 *phash = shsigalgs->hash;
1723 if (psign != NULL)
1724 *psign = shsigalgs->sig;
1725 if (psignhash != NULL)
1726 *psignhash = shsigalgs->sigandhash;
1727 if (rsig != NULL)
1728 *rsig = (unsigned char)(shsigalgs->sigalg & 0xff);
1729 if (rhash != NULL)
1730 *rhash = (unsigned char)((shsigalgs->sigalg >> 8) & 0xff);
348240c6 1731 return (int)s->cert->shared_sigalgslen;
0f113f3e
MC		 1732}
1733
787ebcaf
DSH		 1734/* Maximum possible number of unique entries in sigalgs array */
1735#define TLS_MAX_SIGALGCNT (OSSL_NELEM(sigalg_lookup_tbl) * 2)
0f229cce 1736
0f113f3e
MC		 1737typedef struct {
1738 size_t sigalgcnt;
787ebcaf 1739 int sigalgs[TLS_MAX_SIGALGCNT];
0f113f3e 1740} sig_cb_st;
0f229cce 1741
431f458d
DSH		 1742static void get_sigorhash(int *psig, int *phash, const char *str)
1743{
1744 if (strcmp(str, "RSA") == 0) {
1745 *psig = EVP_PKEY_RSA;
b2eb6998
DSH		 1746 } else if (strcmp(str, "RSA-PSS") == 0 || strcmp(str, "PSS") == 0) {
1747 *psig = EVP_PKEY_RSA_PSS;
431f458d
DSH		 1748 } else if (strcmp(str, "DSA") == 0) {
1749 *psig = EVP_PKEY_DSA;
1750 } else if (strcmp(str, "ECDSA") == 0) {
1751 *psig = EVP_PKEY_EC;
1752 } else {
1753 *phash = OBJ_sn2nid(str);
1754 if (*phash == NID_undef)
1755 *phash = OBJ_ln2nid(str);
1756 }
1757}
787ebcaf
DSH		 1758/* Maximum length of a signature algorithm string component */
1759#define TLS_MAX_SIGSTRING_LEN 40
431f458d 1760
0f229cce 1761static int sig_cb(const char *elem, int len, void *arg)
0f113f3e
MC		 1762{
1763 sig_cb_st *sarg = arg;
1764 size_t i;
787ebcaf 1765 char etmp[TLS_MAX_SIGSTRING_LEN], *p;
431f458d 1766 int sig_alg = NID_undef, hash_alg = NID_undef;
2747d73c
KR		 1767 if (elem == NULL)
1768 return 0;
787ebcaf 1769 if (sarg->sigalgcnt == TLS_MAX_SIGALGCNT)
0f113f3e
MC		 1770 return 0;
1771 if (len > (int)(sizeof(etmp) - 1))
1772 return 0;
1773 memcpy(etmp, elem, len);
1774 etmp[len] = 0;
1775 p = strchr(etmp, '+');
8a43a42a
DSH		 1776 /* See if we have a match for TLS 1.3 names */
1777 if (p == NULL) {
1778 const SIGALG_LOOKUP *s;
1779
1780 for (i = 0, s = sigalg_lookup_tbl; i < OSSL_NELEM(sigalg_lookup_tbl);
1781 i++, s++) {
1782 if (s->name != NULL && strcmp(etmp, s->name) == 0) {
1783 sig_alg = s->sig;
1784 hash_alg = s->hash;
1785 break;
1786 }
1787 }
1788 } else {
1789 *p = 0;
1790 p++;
1791 if (*p == 0)
1792 return 0;
1793 get_sigorhash(&sig_alg, &hash_alg, etmp);
1794 get_sigorhash(&sig_alg, &hash_alg, p);
1795 }
0f113f3e 1796
168067b6 1797 if (sig_alg == NID_undef || (p != NULL && hash_alg == NID_undef))
0f113f3e
MC		 1798 return 0;
1799
1800 for (i = 0; i < sarg->sigalgcnt; i += 2) {
1801 if (sarg->sigalgs[i] == sig_alg && sarg->sigalgs[i + 1] == hash_alg)
1802 return 0;
1803 }
1804 sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
1805 sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
1806 return 1;
1807}
1808
1809/*
9d22666e 1810 * Set supported signature algorithms based on a colon separated list of the
0f113f3e
MC		 1811 * form sig+hash e.g. RSA+SHA512:DSA+SHA512
1812 */
3dbc46df 1813int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
0f113f3e
MC		 1814{
1815 sig_cb_st sig;
1816 sig.sigalgcnt = 0;
1817 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
1818 return 0;
1819 if (c == NULL)
1820 return 1;
1821 return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
1822}
1823
a230b26e 1824int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
0f113f3e 1825{
98c792d1 1826 uint16_t *sigalgs, *sptr;
0f113f3e 1827 size_t i;
63c1df09 1828
0f113f3e
MC		 1829 if (salglen & 1)
1830 return 0;
7a531ee4 1831 sigalgs = OPENSSL_malloc((salglen / 2) * sizeof(*sigalgs));
0f113f3e
MC		 1832 if (sigalgs == NULL)
1833 return 0;
1834 for (i = 0, sptr = sigalgs; i < salglen; i += 2) {
63c1df09 1835 size_t j;
7a531ee4 1836 const SIGALG_LOOKUP *curr;
63c1df09
MC		 1837 int md_id = *psig_nids++;
1838 int sig_id = *psig_nids++;
1839
1840 for (j = 0, curr = sigalg_lookup_tbl; j < OSSL_NELEM(sigalg_lookup_tbl);
1841 j++, curr++) {
fe3066ee 1842 if (curr->hash == md_id && curr->sig == sig_id) {
63c1df09
MC		 1843 *sptr++ = curr->sigalg;
1844 break;
1845 }
1846 }
0f113f3e 1847
63c1df09 1848 if (j == OSSL_NELEM(sigalg_lookup_tbl))
0f113f3e 1849 goto err;
0f113f3e
MC		 1850 }
1851
1852 if (client) {
b548a1f1 1853 OPENSSL_free(c->client_sigalgs);
0f113f3e 1854 c->client_sigalgs = sigalgs;
7a531ee4 1855 c->client_sigalgslen = salglen / 2;
0f113f3e 1856 } else {
b548a1f1 1857 OPENSSL_free(c->conf_sigalgs);
0f113f3e 1858 c->conf_sigalgs = sigalgs;
7a531ee4 1859 c->conf_sigalgslen = salglen / 2;
0f113f3e
MC		 1860 }
1861
1862 return 1;
1863
1864 err:
1865 OPENSSL_free(sigalgs);
1866 return 0;
1867}
4453cd8c 1868
d61ff83b 1869static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
0f113f3e
MC		 1870{
1871 int sig_nid;
1872 size_t i;
1873 if (default_nid == -1)
1874 return 1;
1875 sig_nid = X509_get_signature_nid(x);
1876 if (default_nid)
1877 return sig_nid == default_nid ? 1 : 0;
1878 for (i = 0; i < c->shared_sigalgslen; i++)
4d43ee28 1879 if (sig_nid == c->shared_sigalgs[i]->sigandhash)
0f113f3e
MC		 1880 return 1;
1881 return 0;
1882}
1883
6dbb6219
DSH		 1884/* Check to see if a certificate issuer name matches list of CA names */
1885static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
0f113f3e
MC		 1886{
1887 X509_NAME *nm;
1888 int i;
1889 nm = X509_get_issuer_name(x);
1890 for (i = 0; i < sk_X509_NAME_num(names); i++) {
1891 if (!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
1892 return 1;
1893 }
1894 return 0;
1895}
1896
1897/*
1898 * Check certificate chain is consistent with TLS extensions and is usable by
1899 * server. This servers two purposes: it allows users to check chains before
1900 * passing them to the server and it allows the server to check chains before
1901 * attempting to use them.
d61ff83b 1902 */
6dbb6219 1903
69687aa8 1904/* Flags which need to be set for a certificate when strict mode not set */
6dbb6219 1905
e481f9b9 1906#define CERT_PKEY_VALID_FLAGS \
0f113f3e 1907 (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
6dbb6219 1908/* Strict mode flags */
e481f9b9 1909#define CERT_PKEY_STRICT_FLAGS \
0f113f3e
MC		 1910 (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
1911 | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
6dbb6219 1912
d61ff83b 1913int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
0f113f3e
MC		 1914 int idx)
1915{
1916 int i;
1917 int rv = 0;
1918 int check_flags = 0, strict_mode;
1919 CERT_PKEY *cpk = NULL;
1920 CERT *c = s->cert;
f7d53487 1921 uint32_t *pvalid;
0f113f3e
MC		 1922 unsigned int suiteb_flags = tls1_suiteb(s);
1923 /* idx == -1 means checking server chains */
1924 if (idx != -1) {
1925 /* idx == -2 means checking client certificate chains */
1926 if (idx == -2) {
1927 cpk = c->key;
348240c6 1928 idx = (int)(cpk - c->pkeys);
0f113f3e
MC		 1929 } else
1930 cpk = c->pkeys + idx;
6383d316 1931 pvalid = s->s3->tmp.valid_flags + idx;
0f113f3e
MC		 1932 x = cpk->x509;
1933 pk = cpk->privatekey;
1934 chain = cpk->chain;
1935 strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
1936 /* If no cert or key, forget it */
1937 if (!x || !pk)
1938 goto end;
0f113f3e
MC		 1939 } else {
1940 if (!x || !pk)
d813f9eb 1941 return 0;
0f113f3e
MC		 1942 idx = ssl_cert_type(x, pk);
1943 if (idx == -1)
d813f9eb 1944 return 0;
6383d316
DSH		 1945 pvalid = s->s3->tmp.valid_flags + idx;
1946
0f113f3e
MC		 1947 if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
1948 check_flags = CERT_PKEY_STRICT_FLAGS;
1949 else
1950 check_flags = CERT_PKEY_VALID_FLAGS;
1951 strict_mode = 1;
1952 }
1953
1954 if (suiteb_flags) {
1955 int ok;
1956 if (check_flags)
1957 check_flags |= CERT_PKEY_SUITEB;
1958 ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
1959 if (ok == X509_V_OK)
1960 rv |= CERT_PKEY_SUITEB;
1961 else if (!check_flags)
1962 goto end;
1963 }
1964
1965 /*
1966 * Check all signature algorithms are consistent with signature
1967 * algorithms extension if TLS 1.2 or later and strict mode.
1968 */
1969 if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode) {
1970 int default_nid;
536199ec 1971 int rsign = 0;
76106e60 1972 if (s->s3->tmp.peer_sigalgs)
0f113f3e
MC		 1973 default_nid = 0;
1974 /* If no sigalgs extension use defaults from RFC5246 */
1975 else {
1976 switch (idx) {
d0ff28f8 1977 case SSL_PKEY_RSA:
536199ec 1978 rsign = EVP_PKEY_RSA;
0f113f3e
MC		 1979 default_nid = NID_sha1WithRSAEncryption;
1980 break;
1981
1982 case SSL_PKEY_DSA_SIGN:
536199ec 1983 rsign = EVP_PKEY_DSA;
0f113f3e
MC		 1984 default_nid = NID_dsaWithSHA1;
1985 break;
1986
1987 case SSL_PKEY_ECC:
536199ec 1988 rsign = EVP_PKEY_EC;
0f113f3e
MC		 1989 default_nid = NID_ecdsa_with_SHA1;
1990 break;
1991
e44380a9 1992 case SSL_PKEY_GOST01:
536199ec 1993 rsign = NID_id_GostR3410_2001;
e44380a9
DB		 1994 default_nid = NID_id_GostR3411_94_with_GostR3410_2001;
1995 break;
1996
1997 case SSL_PKEY_GOST12_256:
536199ec 1998 rsign = NID_id_GostR3410_2012_256;
e44380a9
DB		 1999 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_256;
2000 break;
2001
2002 case SSL_PKEY_GOST12_512:
536199ec 2003 rsign = NID_id_GostR3410_2012_512;
e44380a9
DB		 2004 default_nid = NID_id_tc26_signwithdigest_gost3410_2012_512;
2005 break;
2006
0f113f3e
MC		 2007 default:
2008 default_nid = -1;
2009 break;
2010 }
2011 }
2012 /*
2013 * If peer sent no signature algorithms extension and we have set
2014 * preferred signature algorithms check we support sha1.
2015 */
2016 if (default_nid > 0 && c->conf_sigalgs) {
2017 size_t j;
98c792d1 2018 const uint16_t *p = c->conf_sigalgs;
703bcee0 2019 for (j = 0; j < c->conf_sigalgslen; j++, p++) {
44b6318f
DSH		 2020 const SIGALG_LOOKUP *lu = tls1_lookup_sigalg(*p);
2021
2022 if (lu != NULL && lu->hash == NID_sha1 && lu->sig == rsign)
0f113f3e
MC		 2023 break;
2024 }
2025 if (j == c->conf_sigalgslen) {
2026 if (check_flags)
2027 goto skip_sigs;
2028 else
2029 goto end;
2030 }
2031 }
2032 /* Check signature algorithm of each cert in chain */
2033 if (!tls1_check_sig_alg(c, x, default_nid)) {
2034 if (!check_flags)
2035 goto end;
2036 } else
2037 rv |= CERT_PKEY_EE_SIGNATURE;
2038 rv |= CERT_PKEY_CA_SIGNATURE;
2039 for (i = 0; i < sk_X509_num(chain); i++) {
2040 if (!tls1_check_sig_alg(c, sk_X509_value(chain, i), default_nid)) {
2041 if (check_flags) {
2042 rv &= ~CERT_PKEY_CA_SIGNATURE;
2043 break;
2044 } else
2045 goto end;
2046 }
2047 }
2048 }
2049 /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
2050 else if (check_flags)
2051 rv |= CERT_PKEY_EE_SIGNATURE | CERT_PKEY_CA_SIGNATURE;
2052 skip_sigs:
2053 /* Check cert parameters are consistent */
9195ddcd 2054 if (tls1_check_cert_param(s, x, 1))
0f113f3e
MC		 2055 rv |= CERT_PKEY_EE_PARAM;
2056 else if (!check_flags)
2057 goto end;
2058 if (!s->server)
2059 rv |= CERT_PKEY_CA_PARAM;
2060 /* In strict mode check rest of chain too */
2061 else if (strict_mode) {
2062 rv |= CERT_PKEY_CA_PARAM;
2063 for (i = 0; i < sk_X509_num(chain); i++) {
2064 X509 *ca = sk_X509_value(chain, i);
2065 if (!tls1_check_cert_param(s, ca, 0)) {
2066 if (check_flags) {
2067 rv &= ~CERT_PKEY_CA_PARAM;
2068 break;
2069 } else
2070 goto end;
2071 }
2072 }
2073 }
2074 if (!s->server && strict_mode) {
2075 STACK_OF(X509_NAME) *ca_dn;
2076 int check_type = 0;
3aeb9348 2077 switch (EVP_PKEY_id(pk)) {
0f113f3e
MC		 2078 case EVP_PKEY_RSA:
2079 check_type = TLS_CT_RSA_SIGN;
2080 break;
2081 case EVP_PKEY_DSA:
2082 check_type = TLS_CT_DSS_SIGN;
2083 break;
2084 case EVP_PKEY_EC:
2085 check_type = TLS_CT_ECDSA_SIGN;
2086 break;
0f113f3e
MC		 2087 }
2088 if (check_type) {
75c13e78
DSH		 2089 const uint8_t *ctypes = s->s3->tmp.ctype;
2090 size_t j;
2091
2092 for (j = 0; j < s->s3->tmp.ctype_len; j++, ctypes++) {
2093 if (*ctypes == check_type) {
0f113f3e
MC		 2094 rv |= CERT_PKEY_CERT_TYPE;
2095 break;
2096 }
2097 }
2098 if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
2099 goto end;
75c13e78 2100 } else {
0f113f3e 2101 rv |= CERT_PKEY_CERT_TYPE;
75c13e78 2102 }
0f113f3e 2103
fa7c2637 2104 ca_dn = s->s3->tmp.peer_ca_names;
0f113f3e
MC		 2105
2106 if (!sk_X509_NAME_num(ca_dn))
2107 rv |= CERT_PKEY_ISSUER_NAME;
2108
2109 if (!(rv & CERT_PKEY_ISSUER_NAME)) {
2110 if (ssl_check_ca_name(ca_dn, x))
2111 rv |= CERT_PKEY_ISSUER_NAME;
2112 }
2113 if (!(rv & CERT_PKEY_ISSUER_NAME)) {
2114 for (i = 0; i < sk_X509_num(chain); i++) {
2115 X509 *xtmp = sk_X509_value(chain, i);
2116 if (ssl_check_ca_name(ca_dn, xtmp)) {
2117 rv |= CERT_PKEY_ISSUER_NAME;
2118 break;
2119 }
2120 }
2121 }
2122 if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
2123 goto end;
2124 } else
2125 rv |= CERT_PKEY_ISSUER_NAME | CERT_PKEY_CERT_TYPE;
2126
2127 if (!check_flags || (rv & check_flags) == check_flags)
2128 rv |= CERT_PKEY_VALID;
2129
2130 end:
2131
a8bb912d
DSH		 2132 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2133 rv |= *pvalid & (CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN);
2134 else
0f113f3e
MC		 2135 rv |= CERT_PKEY_SIGN | CERT_PKEY_EXPLICIT_SIGN;
2136
2137 /*
2138 * When checking a CERT_PKEY structure all flags are irrelevant if the
2139 * chain is invalid.
2140 */
2141 if (!check_flags) {
a8bb912d 2142 if (rv & CERT_PKEY_VALID) {
6383d316 2143 *pvalid = rv;
a8bb912d
DSH		 2144 } else {
2145 /* Preserve sign and explicit sign flag, clear rest */
2146 *pvalid &= CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
0f113f3e
MC		 2147 return 0;
2148 }
2149 }
2150 return rv;
2151}
d61ff83b
DSH		 2152
2153/* Set validity of certificates in an SSL structure */
2154void tls1_set_cert_validity(SSL *s)
0f113f3e 2155{
d0ff28f8 2156 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA);
17dd65e6 2157 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
17dd65e6 2158 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
e44380a9
DB		 2159 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST01);
2160 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_256);
2161 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_512);
3d234c9e 2162 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ED25519);
0f113f3e
MC		 2163}
2164
69687aa8 2165/* User level utility function to check a chain is suitable */
18d71588 2166int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
0f113f3e
MC		 2167{
2168 return tls1_check_chain(s, x, pk, chain, -1);
2169}
d61ff83b 2170
09599b52
DSH		 2171#ifndef OPENSSL_NO_DH
2172DH *ssl_get_auto_dh(SSL *s)
0f113f3e
MC		 2173{
2174 int dh_secbits = 80;
2175 if (s->cert->dh_tmp_auto == 2)
2176 return DH_get_1024_160();
adc5506a 2177 if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aPSK)) {
0f113f3e
MC		 2178 if (s->s3->tmp.new_cipher->strength_bits == 256)
2179 dh_secbits = 128;
2180 else
2181 dh_secbits = 80;
2182 } else {
a497cf25 2183 if (s->s3->tmp.cert == NULL)
f365a3e2 2184 return NULL;
a497cf25 2185 dh_secbits = EVP_PKEY_security_bits(s->s3->tmp.cert->privatekey);
0f113f3e
MC		 2186 }
2187
2188 if (dh_secbits >= 128) {
2189 DH *dhp = DH_new();
0aeddcfa 2190 BIGNUM *p, *g;
a71edf3b 2191 if (dhp == NULL)
0f113f3e 2192 return NULL;
0aeddcfa
MC		 2193 g = BN_new();
2194 if (g != NULL)
2195 BN_set_word(g, 2);
0f113f3e 2196 if (dh_secbits >= 192)
9021a5df 2197 p = BN_get_rfc3526_prime_8192(NULL);
0f113f3e 2198 else
9021a5df 2199 p = BN_get_rfc3526_prime_3072(NULL);
0aeddcfa 2200 if (p == NULL || g == NULL || !DH_set0_pqg(dhp, p, NULL, g)) {
0f113f3e 2201 DH_free(dhp);
0aeddcfa
MC		 2202 BN_free(p);
2203 BN_free(g);
0f113f3e
MC		 2204 return NULL;
2205 }
2206 return dhp;
2207 }
2208 if (dh_secbits >= 112)
2209 return DH_get_2048_224();
2210 return DH_get_1024_160();
2211}
09599b52 2212#endif
b362ccab
DSH		 2213
2214static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
0f113f3e 2215{
72245f34 2216 int secbits = -1;
8382fd3a 2217 EVP_PKEY *pkey = X509_get0_pubkey(x);
0f113f3e 2218 if (pkey) {
72245f34
DSH		 2219 /*
2220 * If no parameters this will return -1 and fail using the default
2221 * security callback for any non-zero security level. This will
2222 * reject keys which omit parameters but this only affects DSA and
2223 * omission of parameters is never (?) done in practice.
2224 */
0f113f3e 2225 secbits = EVP_PKEY_security_bits(pkey);
72245f34 2226 }
0f113f3e
MC		 2227 if (s)
2228 return ssl_security(s, op, secbits, 0, x);
2229 else
2230 return ssl_ctx_security(ctx, op, secbits, 0, x);
2231}
b362ccab
DSH		 2232
2233static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
0f113f3e
MC		 2234{
2235 /* Lookup signature algorithm digest */
65e89736 2236 int secbits, nid, pknid;
221c7b55
DSH		 2237 /* Don't check signature if self signed */
2238 if ((X509_get_extension_flags(x) & EXFLAG_SS) != 0)
2239 return 1;
65e89736
DSH		 2240 if (!X509_get_signature_info(x, &nid, &pknid, &secbits, NULL))
2241 secbits = -1;
2242 /* If digest NID not defined use signature NID */
2243 if (nid == NID_undef)
2244 nid = pknid;
0f113f3e 2245 if (s)
65e89736 2246 return ssl_security(s, op, secbits, nid, x);
0f113f3e 2247 else
65e89736 2248 return ssl_ctx_security(ctx, op, secbits, nid, x);
0f113f3e 2249}
b362ccab
DSH		 2250
2251int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee)
0f113f3e
MC		 2252{
2253 if (vfy)
2254 vfy = SSL_SECOP_PEER;
2255 if (is_ee) {
2256 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy))
2257 return SSL_R_EE_KEY_TOO_SMALL;
2258 } else {
2259 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy))
2260 return SSL_R_CA_KEY_TOO_SMALL;
2261 }
2262 if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy))
2263 return SSL_R_CA_MD_TOO_WEAK;
2264 return 1;
2265}
2266
2267/*
69687aa8
F		 2268 * Check security of a chain, if |sk| includes the end entity certificate then
2269 * |x| is NULL. If |vfy| is 1 then we are verifying a peer chain and not sending
0f113f3e 2270 * one to the peer. Return values: 1 if ok otherwise error code to use
b362ccab
DSH		 2271 */
2272
2273int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy)
0f113f3e
MC		 2274{
2275 int rv, start_idx, i;
2276 if (x == NULL) {
2277 x = sk_X509_value(sk, 0);
2278 start_idx = 1;
2279 } else
2280 start_idx = 0;
2281
2282 rv = ssl_security_cert(s, NULL, x, vfy, 1);
2283 if (rv != 1)
2284 return rv;
2285
2286 for (i = start_idx; i < sk_X509_num(sk); i++) {
2287 x = sk_X509_value(sk, i);
2288 rv = ssl_security_cert(s, NULL, x, vfy, 0);
2289 if (rv != 1)
2290 return rv;
2291 }
2292 return 1;
2293}
93a77f9e
DSH		 2294
2295/*
2296 * Choose an appropriate signature algorithm based on available certificates
717a265a
DSH		 2297 * Sets chosen certificate and signature algorithm.
2298 *
2299 * For servers if we fail to find a required certificate it is a fatal error
2300 * and an appropriate error code is set and the TLS alert set in *al.
2301 *
2302 * For clients al is set to NULL. If a certificate is not suitable it is not
2303 * a fatal error: we will either try another certificate or not present one
2304 * to the server. In this case no error is set.
93a77f9e 2305 */
4a419f60 2306int tls_choose_sigalg(SSL *s, int *al)
93a77f9e 2307{
7b3a4d61 2308 int idx = -1;
0972bc5c
DSH		 2309 const SIGALG_LOOKUP *lu = NULL;
2310
717a265a
DSH		 2311 s->s3->tmp.cert = NULL;
2312 s->s3->tmp.sigalg = NULL;
2313
93a77f9e
DSH		 2314 if (SSL_IS_TLS13(s)) {
2315 size_t i;
21f198ec 2316#ifndef OPENSSL_NO_EC
e892e325 2317 int curve = -1, skip_ec = 0;
21f198ec 2318#endif
93a77f9e 2319
69687aa8 2320 /* Look for a certificate matching shared sigalgs */
93a77f9e 2321 for (i = 0; i < s->cert->shared_sigalgslen; i++) {
0972bc5c 2322 lu = s->cert->shared_sigalgs[i];
93a77f9e 2323
d8311fc9
MC		 2324 /* Skip SHA1, SHA224, DSA and RSA if not PSS */
2325 if (lu->hash == NID_sha1
2326 || lu->hash == NID_sha224
2327 || lu->sig == EVP_PKEY_DSA
095a982b 2328 || lu->sig == EVP_PKEY_RSA)
93a77f9e 2329 continue;
168067b6 2330 if (!tls1_lookup_md(lu, NULL))
93a77f9e
DSH		 2331 continue;
2332 idx = lu->sig_idx;
0972bc5c 2333 if (!ssl_has_cert(s, idx))
93a77f9e 2334 continue;
93a77f9e 2335 if (lu->sig == EVP_PKEY_EC) {
21f198ec 2336#ifndef OPENSSL_NO_EC
93a77f9e 2337 if (curve == -1) {
0972bc5c 2338 EC_KEY *ec = EVP_PKEY_get0_EC_KEY(s->cert->pkeys[idx].privatekey);
93a77f9e
DSH		 2339
2340 curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
e892e325
DSH		 2341 if (EC_KEY_get_conv_form(ec)
2342 != POINT_CONVERSION_UNCOMPRESSED)
2343 skip_ec = 1;
93a77f9e 2344 }
e892e325 2345 if (skip_ec || (lu->curve != NID_undef && curve != lu->curve))
93a77f9e 2346 continue;
21f198ec
RL		 2347#else
2348 continue;
2349#endif
93a77f9e 2350 }
0972bc5c
DSH		 2351 break;
2352 }
2353 if (i == s->cert->shared_sigalgslen) {
717a265a
DSH		 2354 if (al == NULL)
2355 return 1;
0972bc5c
DSH		 2356 *al = SSL_AD_HANDSHAKE_FAILURE;
2357 SSLerr(SSL_F_TLS_CHOOSE_SIGALG,
2358 SSL_R_NO_SUITABLE_SIGNATURE_ALGORITHM);
2359 return 0;
2360 }
2361 } else {
717a265a
DSH		 2362 if (s->server) {
2363 /* Find index corresponding to ciphersuite */
2364 idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
2365 /* If no certificate for ciphersuite return */
2366 if (idx == -1)
2367 return 1;
2368 if (idx == SSL_PKEY_GOST_EC) {
69687aa8 2369 /* Work out which GOST certificate is available */
717a265a
DSH		 2370 if (ssl_has_cert(s, SSL_PKEY_GOST12_512)) {
2371 idx = SSL_PKEY_GOST12_512;
2372 } else if (ssl_has_cert(s, SSL_PKEY_GOST12_256)) {
2373 idx = SSL_PKEY_GOST12_256;
2374 } else if (ssl_has_cert(s, SSL_PKEY_GOST01)) {
2375 idx = SSL_PKEY_GOST01;
2376 } else {
2377 if (al == NULL)
2378 return 1;
2379 *al = SSL_AD_INTERNAL_ERROR;
2380 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2381 return 0;
2382 }
2383 } else if (!ssl_has_cert(s, idx)) {
b2021556
DSH		 2384 /* Allow Ed25519 if no EC certificate */
2385 if (idx == SSL_PKEY_ECC && ssl_has_cert(s, SSL_PKEY_ED25519)) {
2386 idx = SSL_PKEY_ED25519;
2387 } else {
2388 if (al == NULL)
2389 return 1;
2390 *al = SSL_AD_INTERNAL_ERROR;
2391 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2392 return 0;
2393 }
0972bc5c 2394 }
717a265a
DSH		 2395 } else {
2396 /* Find index for client certificate */
2397 idx = s->cert->key - s->cert->pkeys;
2398 if (!ssl_has_cert(s, idx))
2399 return 1;
0972bc5c
DSH		 2400 }
2401
2402 if (SSL_USE_SIGALGS(s)) {
2403 if (s->s3->tmp.peer_sigalgs != NULL) {
2404 size_t i;
599b586d
DSH		 2405#ifndef OPENSSL_NO_EC
2406 int curve;
2407
2408 /* For Suite B need to match signature algorithm to curve */
2409 if (tls1_suiteb(s)) {
2410 EC_KEY *ec = EVP_PKEY_get0_EC_KEY(s->cert->pkeys[idx].privatekey);
2411 curve = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
2412 } else {
2413 curve = -1;
2414 }
2415#endif
0972bc5c
DSH		 2416
2417 /*
2418 * Find highest preference signature algorithm matching
2419 * cert type
2420 */
2421 for (i = 0; i < s->cert->shared_sigalgslen; i++) {
2422 lu = s->cert->shared_sigalgs[i];
599b586d 2423#ifdef OPENSSL_NO_EC
0972bc5c
DSH		 2424 if (lu->sig_idx == idx)
2425 break;
599b586d
DSH		 2426#else
2427 if (lu->sig_idx == idx
2428 && (curve == -1 || lu->curve == curve))
2429 break;
b2021556
DSH		 2430 if (idx == SSL_PKEY_ECC && lu->sig == NID_ED25519) {
2431 idx = SSL_PKEY_ED25519;
2432 break;
2433 }
599b586d 2434#endif
0972bc5c
DSH		 2435 if (idx == SSL_PKEY_RSA && lu->sig == EVP_PKEY_RSA_PSS)
2436 break;
2437 }
2438 if (i == s->cert->shared_sigalgslen) {
717a265a
DSH		 2439 if (al == NULL)
2440 return 1;
0972bc5c
DSH		 2441 *al = SSL_AD_INTERNAL_ERROR;
2442 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2443 return 0;
2444 }
2445 } else {
2446 /*
2447 * If we have no sigalg use defaults
2448 */
2449 const uint16_t *sent_sigs;
2450 size_t sent_sigslen, i;
2451
2452 if ((lu = tls1_get_legacy_sigalg(s, idx)) == NULL) {
717a265a
DSH		 2453 if (al == NULL)
2454 return 1;
0972bc5c
DSH		 2455 *al = SSL_AD_INTERNAL_ERROR;
2456 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2457 return 0;
2458 }
2459
2460 /* Check signature matches a type we sent */
2461 sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
2462 for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
2463 if (lu->sigalg == *sent_sigs)
2464 break;
2465 }
2466 if (i == sent_sigslen) {
717a265a
DSH		 2467 if (al == NULL)
2468 return 1;
0972bc5c 2469 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE);
fb34a0f4 2470 *al = SSL_AD_ILLEGAL_PARAMETER;
0972bc5c
DSH		 2471 return 0;
2472 }
2473 }
2474 } else {
2475 if ((lu = tls1_get_legacy_sigalg(s, idx)) == NULL) {
717a265a
DSH		 2476 if (al == NULL)
2477 return 1;
0972bc5c
DSH		 2478 *al = SSL_AD_INTERNAL_ERROR;
2479 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2480 return 0;
2481 }
2482 }
93a77f9e 2483 }
7b3a4d61 2484 if (idx == -1) {
717a265a
DSH		 2485 if (al != NULL) {
2486 *al = SSL_AD_INTERNAL_ERROR;
2487 SSLerr(SSL_F_TLS_CHOOSE_SIGALG, ERR_R_INTERNAL_ERROR);
2488 }
7b3a4d61
DSH		 2489 return 0;
2490 }
a497cf25 2491 s->s3->tmp.cert = &s->cert->pkeys[idx];
59088e43 2492 s->cert->key = s->s3->tmp.cert;
0972bc5c 2493 s->s3->tmp.sigalg = lu;
93a77f9e
DSH		 2494 return 1;
2495}
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