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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 | |
d736bc1a | 23 | static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, size_t ticklen, |
ec60ccc1 | 24 | const unsigned char *sess_id, size_t sesslen, |
0f113f3e | 25 | SSL_SESSION **psess); |
2daceb03 | 26 | static int ssl_check_clienthello_tlsext_early(SSL *s); |
aa474d1f | 27 | static int ssl_check_serverhello_tlsext(SSL *s); |
6434abbf | 28 | |
0f113f3e MC |
29 | SSL3_ENC_METHOD const TLSv1_enc_data = { |
30 | tls1_enc, | |
31 | tls1_mac, | |
32 | tls1_setup_key_block, | |
33 | tls1_generate_master_secret, | |
34 | tls1_change_cipher_state, | |
35 | tls1_final_finish_mac, | |
0f113f3e MC |
36 | TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE, |
37 | TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE, | |
38 | tls1_alert_code, | |
39 | tls1_export_keying_material, | |
40 | 0, | |
a29fa98c | 41 | ssl3_set_handshake_header, |
2c7b4dbc | 42 | tls_close_construct_packet, |
0f113f3e MC |
43 | ssl3_handshake_write |
44 | }; | |
45 | ||
46 | SSL3_ENC_METHOD const TLSv1_1_enc_data = { | |
47 | tls1_enc, | |
48 | tls1_mac, | |
49 | tls1_setup_key_block, | |
50 | tls1_generate_master_secret, | |
51 | tls1_change_cipher_state, | |
52 | tls1_final_finish_mac, | |
0f113f3e MC |
53 | TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE, |
54 | TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE, | |
55 | tls1_alert_code, | |
56 | tls1_export_keying_material, | |
57 | SSL_ENC_FLAG_EXPLICIT_IV, | |
a29fa98c | 58 | ssl3_set_handshake_header, |
2c7b4dbc | 59 | tls_close_construct_packet, |
0f113f3e MC |
60 | ssl3_handshake_write |
61 | }; | |
62 | ||
63 | SSL3_ENC_METHOD const TLSv1_2_enc_data = { | |
64 | tls1_enc, | |
65 | tls1_mac, | |
66 | tls1_setup_key_block, | |
67 | tls1_generate_master_secret, | |
68 | tls1_change_cipher_state, | |
69 | tls1_final_finish_mac, | |
0f113f3e MC |
70 | TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE, |
71 | TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE, | |
72 | tls1_alert_code, | |
73 | tls1_export_keying_material, | |
74 | SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF | |
75 | | SSL_ENC_FLAG_TLS1_2_CIPHERS, | |
a29fa98c | 76 | ssl3_set_handshake_header, |
2c7b4dbc | 77 | tls_close_construct_packet, |
0f113f3e MC |
78 | ssl3_handshake_write |
79 | }; | |
58964a49 | 80 | |
582a17d6 MC |
81 | SSL3_ENC_METHOD const TLSv1_3_enc_data = { |
82 | tls1_enc, | |
83 | tls1_mac, | |
84 | tls1_setup_key_block, | |
85 | tls1_generate_master_secret, | |
86 | tls1_change_cipher_state, | |
87 | tls1_final_finish_mac, | |
582a17d6 MC |
88 | TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE, |
89 | TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE, | |
90 | tls1_alert_code, | |
91 | tls1_export_keying_material, | |
92 | SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF | |
93 | | SSL_ENC_FLAG_TLS1_2_CIPHERS, | |
582a17d6 MC |
94 | ssl3_set_handshake_header, |
95 | tls_close_construct_packet, | |
96 | ssl3_handshake_write | |
97 | }; | |
98 | ||
f3b656b2 | 99 | long tls1_default_timeout(void) |
0f113f3e MC |
100 | { |
101 | /* | |
102 | * 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for | |
103 | * http, the cache would over fill | |
104 | */ | |
105 | return (60 * 60 * 2); | |
106 | } | |
58964a49 | 107 | |
6b691a5c | 108 | int tls1_new(SSL *s) |
0f113f3e MC |
109 | { |
110 | if (!ssl3_new(s)) | |
111 | return (0); | |
112 | s->method->ssl_clear(s); | |
113 | return (1); | |
114 | } | |
58964a49 | 115 | |
6b691a5c | 116 | void tls1_free(SSL *s) |
0f113f3e | 117 | { |
b548a1f1 | 118 | OPENSSL_free(s->tlsext_session_ticket); |
0f113f3e MC |
119 | ssl3_free(s); |
120 | } | |
58964a49 | 121 | |
6b691a5c | 122 | void tls1_clear(SSL *s) |
0f113f3e MC |
123 | { |
124 | ssl3_clear(s); | |
4fa52141 VD |
125 | if (s->method->version == TLS_ANY_VERSION) |
126 | s->version = TLS_MAX_VERSION; | |
127 | else | |
128 | s->version = s->method->version; | |
0f113f3e | 129 | } |
58964a49 | 130 | |
525de5d3 | 131 | #ifndef OPENSSL_NO_EC |
eda3766b | 132 | |
0f113f3e MC |
133 | typedef struct { |
134 | int nid; /* Curve NID */ | |
135 | int secbits; /* Bits of security (from SP800-57) */ | |
136 | unsigned int flags; /* Flags: currently just field type */ | |
137 | } tls_curve_info; | |
138 | ||
2dc1aeed DSH |
139 | /* |
140 | * Table of curve information. | |
ddb4c047 | 141 | * Do not delete entries or reorder this array! It is used as a lookup |
2dc1aeed DSH |
142 | * table: the index of each entry is one less than the TLS curve id. |
143 | */ | |
0f113f3e MC |
144 | static const tls_curve_info nid_list[] = { |
145 | {NID_sect163k1, 80, TLS_CURVE_CHAR2}, /* sect163k1 (1) */ | |
146 | {NID_sect163r1, 80, TLS_CURVE_CHAR2}, /* sect163r1 (2) */ | |
147 | {NID_sect163r2, 80, TLS_CURVE_CHAR2}, /* sect163r2 (3) */ | |
148 | {NID_sect193r1, 80, TLS_CURVE_CHAR2}, /* sect193r1 (4) */ | |
149 | {NID_sect193r2, 80, TLS_CURVE_CHAR2}, /* sect193r2 (5) */ | |
150 | {NID_sect233k1, 112, TLS_CURVE_CHAR2}, /* sect233k1 (6) */ | |
151 | {NID_sect233r1, 112, TLS_CURVE_CHAR2}, /* sect233r1 (7) */ | |
152 | {NID_sect239k1, 112, TLS_CURVE_CHAR2}, /* sect239k1 (8) */ | |
153 | {NID_sect283k1, 128, TLS_CURVE_CHAR2}, /* sect283k1 (9) */ | |
154 | {NID_sect283r1, 128, TLS_CURVE_CHAR2}, /* sect283r1 (10) */ | |
155 | {NID_sect409k1, 192, TLS_CURVE_CHAR2}, /* sect409k1 (11) */ | |
156 | {NID_sect409r1, 192, TLS_CURVE_CHAR2}, /* sect409r1 (12) */ | |
157 | {NID_sect571k1, 256, TLS_CURVE_CHAR2}, /* sect571k1 (13) */ | |
158 | {NID_sect571r1, 256, TLS_CURVE_CHAR2}, /* sect571r1 (14) */ | |
159 | {NID_secp160k1, 80, TLS_CURVE_PRIME}, /* secp160k1 (15) */ | |
160 | {NID_secp160r1, 80, TLS_CURVE_PRIME}, /* secp160r1 (16) */ | |
161 | {NID_secp160r2, 80, TLS_CURVE_PRIME}, /* secp160r2 (17) */ | |
162 | {NID_secp192k1, 80, TLS_CURVE_PRIME}, /* secp192k1 (18) */ | |
163 | {NID_X9_62_prime192v1, 80, TLS_CURVE_PRIME}, /* secp192r1 (19) */ | |
164 | {NID_secp224k1, 112, TLS_CURVE_PRIME}, /* secp224k1 (20) */ | |
165 | {NID_secp224r1, 112, TLS_CURVE_PRIME}, /* secp224r1 (21) */ | |
166 | {NID_secp256k1, 128, TLS_CURVE_PRIME}, /* secp256k1 (22) */ | |
167 | {NID_X9_62_prime256v1, 128, TLS_CURVE_PRIME}, /* secp256r1 (23) */ | |
168 | {NID_secp384r1, 192, TLS_CURVE_PRIME}, /* secp384r1 (24) */ | |
169 | {NID_secp521r1, 256, TLS_CURVE_PRIME}, /* secp521r1 (25) */ | |
170 | {NID_brainpoolP256r1, 128, TLS_CURVE_PRIME}, /* brainpoolP256r1 (26) */ | |
171 | {NID_brainpoolP384r1, 192, TLS_CURVE_PRIME}, /* brainpoolP384r1 (27) */ | |
172 | {NID_brainpoolP512r1, 256, TLS_CURVE_PRIME}, /* brainpool512r1 (28) */ | |
ec24630a | 173 | {NID_X25519, 128, TLS_CURVE_CUSTOM}, /* X25519 (29) */ |
0f113f3e MC |
174 | }; |
175 | ||
176 | static const unsigned char ecformats_default[] = { | |
177 | TLSEXT_ECPOINTFORMAT_uncompressed, | |
178 | TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime, | |
179 | TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2 | |
180 | }; | |
181 | ||
fe6ef247 KR |
182 | /* The default curves */ |
183 | static const unsigned char eccurves_default[] = { | |
1db3107a | 184 | 0, 29, /* X25519 (29) */ |
de57d237 | 185 | 0, 23, /* secp256r1 (23) */ |
0f113f3e | 186 | 0, 25, /* secp521r1 (25) */ |
0f113f3e | 187 | 0, 24, /* secp384r1 (24) */ |
de57d237 EK |
188 | }; |
189 | ||
190 | static const unsigned char eccurves_all[] = { | |
1db3107a | 191 | 0, 29, /* X25519 (29) */ |
de57d237 | 192 | 0, 23, /* secp256r1 (23) */ |
de57d237 | 193 | 0, 25, /* secp521r1 (25) */ |
de57d237 | 194 | 0, 24, /* secp384r1 (24) */ |
0f113f3e | 195 | 0, 26, /* brainpoolP256r1 (26) */ |
ddb4c047 RS |
196 | 0, 27, /* brainpoolP384r1 (27) */ |
197 | 0, 28, /* brainpool512r1 (28) */ | |
198 | ||
199 | /* | |
200 | * Remaining curves disabled by default but still permitted if set | |
201 | * via an explicit callback or parameters. | |
202 | */ | |
0f113f3e | 203 | 0, 22, /* secp256k1 (22) */ |
de57d237 EK |
204 | 0, 14, /* sect571r1 (14) */ |
205 | 0, 13, /* sect571k1 (13) */ | |
206 | 0, 11, /* sect409k1 (11) */ | |
207 | 0, 12, /* sect409r1 (12) */ | |
208 | 0, 9, /* sect283k1 (9) */ | |
209 | 0, 10, /* sect283r1 (10) */ | |
de57d237 EK |
210 | 0, 20, /* secp224k1 (20) */ |
211 | 0, 21, /* secp224r1 (21) */ | |
212 | 0, 18, /* secp192k1 (18) */ | |
213 | 0, 19, /* secp192r1 (19) */ | |
214 | 0, 15, /* secp160k1 (15) */ | |
215 | 0, 16, /* secp160r1 (16) */ | |
216 | 0, 17, /* secp160r2 (17) */ | |
0f113f3e MC |
217 | 0, 8, /* sect239k1 (8) */ |
218 | 0, 6, /* sect233k1 (6) */ | |
219 | 0, 7, /* sect233r1 (7) */ | |
0f113f3e MC |
220 | 0, 4, /* sect193r1 (4) */ |
221 | 0, 5, /* sect193r2 (5) */ | |
0f113f3e MC |
222 | 0, 1, /* sect163k1 (1) */ |
223 | 0, 2, /* sect163r1 (2) */ | |
224 | 0, 3, /* sect163r2 (3) */ | |
0f113f3e MC |
225 | }; |
226 | ||
227 | static const unsigned char suiteb_curves[] = { | |
228 | 0, TLSEXT_curve_P_256, | |
229 | 0, TLSEXT_curve_P_384 | |
230 | }; | |
2ea80354 | 231 | |
ec24630a | 232 | int tls1_ec_curve_id2nid(int curve_id, unsigned int *pflags) |
0f113f3e | 233 | { |
ec24630a | 234 | const tls_curve_info *cinfo; |
0f113f3e | 235 | /* ECC curves from RFC 4492 and RFC 7027 */ |
b6eb9827 | 236 | if ((curve_id < 1) || ((unsigned int)curve_id > OSSL_NELEM(nid_list))) |
0f113f3e | 237 | return 0; |
ec24630a DSH |
238 | cinfo = nid_list + curve_id - 1; |
239 | if (pflags) | |
240 | *pflags = cinfo->flags; | |
241 | return cinfo->nid; | |
0f113f3e | 242 | } |
525de5d3 DSH |
243 | |
244 | int tls1_ec_nid2curve_id(int nid) | |
0f113f3e | 245 | { |
2fa2d15a DSH |
246 | size_t i; |
247 | for (i = 0; i < OSSL_NELEM(nid_list); i++) { | |
248 | if (nid_list[i].nid == nid) | |
348240c6 | 249 | return (int)(i + 1); |
0f113f3e | 250 | } |
2fa2d15a | 251 | return 0; |
0f113f3e MC |
252 | } |
253 | ||
740580c2 EK |
254 | /* |
255 | * Get curves list, if "sess" is set return client curves otherwise | |
256 | * preferred list. | |
257 | * Sets |num_curves| to the number of curves in the list, i.e., | |
258 | * the length of |pcurves| is 2 * num_curves. | |
259 | * Returns 1 on success and 0 if the client curves list has invalid format. | |
260 | * The latter indicates an internal error: we should not be accepting such | |
261 | * lists in the first place. | |
262 | * TODO(emilia): we should really be storing the curves list in explicitly | |
263 | * parsed form instead. (However, this would affect binary compatibility | |
264 | * so cannot happen in the 1.0.x series.) | |
fd2b65ce | 265 | */ |
740580c2 | 266 | static int tls1_get_curvelist(SSL *s, int sess, |
a230b26e | 267 | const unsigned char **pcurves, size_t *num_curves) |
0f113f3e MC |
268 | { |
269 | size_t pcurveslen = 0; | |
270 | if (sess) { | |
de4d764e MC |
271 | *pcurves = s->session->tlsext_supportedgroupslist; |
272 | pcurveslen = s->session->tlsext_supportedgroupslist_length; | |
0f113f3e MC |
273 | } else { |
274 | /* For Suite B mode only include P-256, P-384 */ | |
275 | switch (tls1_suiteb(s)) { | |
276 | case SSL_CERT_FLAG_SUITEB_128_LOS: | |
277 | *pcurves = suiteb_curves; | |
278 | pcurveslen = sizeof(suiteb_curves); | |
279 | break; | |
280 | ||
281 | case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY: | |
282 | *pcurves = suiteb_curves; | |
283 | pcurveslen = 2; | |
284 | break; | |
285 | ||
286 | case SSL_CERT_FLAG_SUITEB_192_LOS: | |
287 | *pcurves = suiteb_curves + 2; | |
288 | pcurveslen = 2; | |
289 | break; | |
290 | default: | |
de4d764e MC |
291 | *pcurves = s->tlsext_supportedgroupslist; |
292 | pcurveslen = s->tlsext_supportedgroupslist_length; | |
0f113f3e MC |
293 | } |
294 | if (!*pcurves) { | |
fe6ef247 KR |
295 | *pcurves = eccurves_default; |
296 | pcurveslen = sizeof(eccurves_default); | |
0f113f3e MC |
297 | } |
298 | } | |
299 | ||
300 | /* We do not allow odd length arrays to enter the system. */ | |
301 | if (pcurveslen & 1) { | |
302 | SSLerr(SSL_F_TLS1_GET_CURVELIST, ERR_R_INTERNAL_ERROR); | |
303 | *num_curves = 0; | |
304 | return 0; | |
305 | } else { | |
306 | *num_curves = pcurveslen / 2; | |
307 | return 1; | |
308 | } | |
309 | } | |
b362ccab DSH |
310 | |
311 | /* See if curve is allowed by security callback */ | |
312 | static int tls_curve_allowed(SSL *s, const unsigned char *curve, int op) | |
0f113f3e MC |
313 | { |
314 | const tls_curve_info *cinfo; | |
315 | if (curve[0]) | |
316 | return 1; | |
b6eb9827 | 317 | if ((curve[1] < 1) || ((size_t)curve[1] > OSSL_NELEM(nid_list))) |
0f113f3e MC |
318 | return 0; |
319 | cinfo = &nid_list[curve[1] - 1]; | |
320 | # ifdef OPENSSL_NO_EC2M | |
321 | if (cinfo->flags & TLS_CURVE_CHAR2) | |
322 | return 0; | |
323 | # endif | |
324 | return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)curve); | |
325 | } | |
b362ccab | 326 | |
d18b716d DSH |
327 | /* Check a curve is one of our preferences */ |
328 | int tls1_check_curve(SSL *s, const unsigned char *p, size_t len) | |
0f113f3e MC |
329 | { |
330 | const unsigned char *curves; | |
331 | size_t num_curves, i; | |
332 | unsigned int suiteb_flags = tls1_suiteb(s); | |
333 | if (len != 3 || p[0] != NAMED_CURVE_TYPE) | |
334 | return 0; | |
335 | /* Check curve matches Suite B preferences */ | |
336 | if (suiteb_flags) { | |
337 | unsigned long cid = s->s3->tmp.new_cipher->id; | |
338 | if (p[1]) | |
339 | return 0; | |
340 | if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) { | |
341 | if (p[2] != TLSEXT_curve_P_256) | |
342 | return 0; | |
343 | } else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) { | |
344 | if (p[2] != TLSEXT_curve_P_384) | |
345 | return 0; | |
346 | } else /* Should never happen */ | |
347 | return 0; | |
348 | } | |
349 | if (!tls1_get_curvelist(s, 0, &curves, &num_curves)) | |
350 | return 0; | |
351 | for (i = 0; i < num_curves; i++, curves += 2) { | |
352 | if (p[1] == curves[0] && p[2] == curves[1]) | |
353 | return tls_curve_allowed(s, p + 1, SSL_SECOP_CURVE_CHECK); | |
354 | } | |
355 | return 0; | |
356 | } | |
d0595f17 | 357 | |
1d97c843 | 358 | /*- |
de4d764e | 359 | * For nmatch >= 0, return the NID of the |nmatch|th shared group or NID_undef |
6977e8ee KR |
360 | * if there is no match. |
361 | * For nmatch == -1, return number of matches | |
de4d764e | 362 | * For nmatch == -2, return the NID of the group to use for |
376e2ca3 | 363 | * an EC tmp key, or NID_undef if there is no match. |
d0595f17 | 364 | */ |
de4d764e | 365 | int tls1_shared_group(SSL *s, int nmatch) |
0f113f3e MC |
366 | { |
367 | const unsigned char *pref, *supp; | |
368 | size_t num_pref, num_supp, i, j; | |
369 | int k; | |
370 | /* Can't do anything on client side */ | |
371 | if (s->server == 0) | |
372 | return -1; | |
373 | if (nmatch == -2) { | |
374 | if (tls1_suiteb(s)) { | |
375 | /* | |
376 | * For Suite B ciphersuite determines curve: we already know | |
377 | * these are acceptable due to previous checks. | |
378 | */ | |
379 | unsigned long cid = s->s3->tmp.new_cipher->id; | |
380 | if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) | |
381 | return NID_X9_62_prime256v1; /* P-256 */ | |
382 | if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) | |
383 | return NID_secp384r1; /* P-384 */ | |
384 | /* Should never happen */ | |
385 | return NID_undef; | |
386 | } | |
387 | /* If not Suite B just return first preference shared curve */ | |
388 | nmatch = 0; | |
389 | } | |
390 | /* | |
391 | * Avoid truncation. tls1_get_curvelist takes an int | |
392 | * but s->options is a long... | |
393 | */ | |
394 | if (!tls1_get_curvelist | |
395 | (s, (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0, &supp, | |
396 | &num_supp)) | |
397 | /* In practice, NID_undef == 0 but let's be precise. */ | |
398 | return nmatch == -1 ? 0 : NID_undef; | |
399 | if (!tls1_get_curvelist | |
a230b26e | 400 | (s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE), &pref, &num_pref)) |
0f113f3e | 401 | return nmatch == -1 ? 0 : NID_undef; |
3c06513f KR |
402 | |
403 | /* | |
404 | * If the client didn't send the elliptic_curves extension all of them | |
405 | * are allowed. | |
406 | */ | |
407 | if (num_supp == 0 && (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0) { | |
408 | supp = eccurves_all; | |
409 | num_supp = sizeof(eccurves_all) / 2; | |
410 | } else if (num_pref == 0 && | |
a230b26e | 411 | (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) == 0) { |
3c06513f KR |
412 | pref = eccurves_all; |
413 | num_pref = sizeof(eccurves_all) / 2; | |
414 | } | |
415 | ||
0f113f3e MC |
416 | k = 0; |
417 | for (i = 0; i < num_pref; i++, pref += 2) { | |
418 | const unsigned char *tsupp = supp; | |
419 | for (j = 0; j < num_supp; j++, tsupp += 2) { | |
420 | if (pref[0] == tsupp[0] && pref[1] == tsupp[1]) { | |
421 | if (!tls_curve_allowed(s, pref, SSL_SECOP_CURVE_SHARED)) | |
422 | continue; | |
423 | if (nmatch == k) { | |
424 | int id = (pref[0] << 8) | pref[1]; | |
ec24630a | 425 | return tls1_ec_curve_id2nid(id, NULL); |
0f113f3e MC |
426 | } |
427 | k++; | |
428 | } | |
429 | } | |
430 | } | |
431 | if (nmatch == -1) | |
432 | return k; | |
433 | /* Out of range (nmatch > k). */ | |
434 | return NID_undef; | |
435 | } | |
d0595f17 | 436 | |
de4d764e MC |
437 | int tls1_set_groups(unsigned char **pext, size_t *pextlen, |
438 | int *groups, size_t ngroups) | |
0f113f3e | 439 | { |
de4d764e | 440 | unsigned char *glist, *p; |
0f113f3e MC |
441 | size_t i; |
442 | /* | |
de4d764e | 443 | * Bitmap of groups included to detect duplicates: only works while group |
0f113f3e MC |
444 | * ids < 32 |
445 | */ | |
446 | unsigned long dup_list = 0; | |
de4d764e MC |
447 | glist = OPENSSL_malloc(ngroups * 2); |
448 | if (glist == NULL) | |
0f113f3e | 449 | return 0; |
de4d764e | 450 | for (i = 0, p = glist; i < ngroups; i++) { |
0f113f3e MC |
451 | unsigned long idmask; |
452 | int id; | |
de4d764e MC |
453 | /* TODO(TLS1.3): Convert for DH groups */ |
454 | id = tls1_ec_nid2curve_id(groups[i]); | |
0f113f3e MC |
455 | idmask = 1L << id; |
456 | if (!id || (dup_list & idmask)) { | |
de4d764e | 457 | OPENSSL_free(glist); |
0f113f3e MC |
458 | return 0; |
459 | } | |
460 | dup_list |= idmask; | |
461 | s2n(id, p); | |
462 | } | |
b548a1f1 | 463 | OPENSSL_free(*pext); |
de4d764e MC |
464 | *pext = glist; |
465 | *pextlen = ngroups * 2; | |
0f113f3e MC |
466 | return 1; |
467 | } | |
468 | ||
469 | # define MAX_CURVELIST 28 | |
470 | ||
471 | typedef struct { | |
472 | size_t nidcnt; | |
473 | int nid_arr[MAX_CURVELIST]; | |
474 | } nid_cb_st; | |
d0595f17 DSH |
475 | |
476 | static int nid_cb(const char *elem, int len, void *arg) | |
0f113f3e MC |
477 | { |
478 | nid_cb_st *narg = arg; | |
479 | size_t i; | |
480 | int nid; | |
481 | char etmp[20]; | |
2747d73c KR |
482 | if (elem == NULL) |
483 | return 0; | |
0f113f3e MC |
484 | if (narg->nidcnt == MAX_CURVELIST) |
485 | return 0; | |
486 | if (len > (int)(sizeof(etmp) - 1)) | |
487 | return 0; | |
488 | memcpy(etmp, elem, len); | |
489 | etmp[len] = 0; | |
490 | nid = EC_curve_nist2nid(etmp); | |
491 | if (nid == NID_undef) | |
492 | nid = OBJ_sn2nid(etmp); | |
493 | if (nid == NID_undef) | |
494 | nid = OBJ_ln2nid(etmp); | |
495 | if (nid == NID_undef) | |
496 | return 0; | |
497 | for (i = 0; i < narg->nidcnt; i++) | |
498 | if (narg->nid_arr[i] == nid) | |
499 | return 0; | |
500 | narg->nid_arr[narg->nidcnt++] = nid; | |
501 | return 1; | |
502 | } | |
503 | ||
de4d764e MC |
504 | /* Set groups based on a colon separate list */ |
505 | int tls1_set_groups_list(unsigned char **pext, size_t *pextlen, const char *str) | |
0f113f3e MC |
506 | { |
507 | nid_cb_st ncb; | |
508 | ncb.nidcnt = 0; | |
509 | if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb)) | |
510 | return 0; | |
511 | if (pext == NULL) | |
512 | return 1; | |
de4d764e | 513 | return tls1_set_groups(pext, pextlen, ncb.nid_arr, ncb.nidcnt); |
0f113f3e MC |
514 | } |
515 | ||
fd2b65ce DSH |
516 | /* For an EC key set TLS id and required compression based on parameters */ |
517 | static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id, | |
0f113f3e MC |
518 | EC_KEY *ec) |
519 | { | |
2235b7f2 | 520 | int id; |
0f113f3e | 521 | const EC_GROUP *grp; |
0f113f3e MC |
522 | if (!ec) |
523 | return 0; | |
524 | /* Determine if it is a prime field */ | |
525 | grp = EC_KEY_get0_group(ec); | |
526 | if (!grp) | |
527 | return 0; | |
0f113f3e MC |
528 | /* Determine curve ID */ |
529 | id = EC_GROUP_get_curve_name(grp); | |
530 | id = tls1_ec_nid2curve_id(id); | |
2235b7f2 DSH |
531 | /* If no id return error: we don't support arbitrary explicit curves */ |
532 | if (id == 0) | |
533 | return 0; | |
534 | curve_id[0] = 0; | |
535 | curve_id[1] = (unsigned char)id; | |
0f113f3e MC |
536 | if (comp_id) { |
537 | if (EC_KEY_get0_public_key(ec) == NULL) | |
538 | return 0; | |
2235b7f2 DSH |
539 | if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_UNCOMPRESSED) { |
540 | *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed; | |
541 | } else { | |
542 | if ((nid_list[id - 1].flags & TLS_CURVE_TYPE) == TLS_CURVE_PRIME) | |
0f113f3e MC |
543 | *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; |
544 | else | |
545 | *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; | |
2235b7f2 | 546 | } |
0f113f3e MC |
547 | } |
548 | return 1; | |
549 | } | |
550 | ||
fd2b65ce DSH |
551 | /* Check an EC key is compatible with extensions */ |
552 | static int tls1_check_ec_key(SSL *s, | |
0f113f3e MC |
553 | unsigned char *curve_id, unsigned char *comp_id) |
554 | { | |
555 | const unsigned char *pformats, *pcurves; | |
556 | size_t num_formats, num_curves, i; | |
557 | int j; | |
558 | /* | |
559 | * If point formats extension present check it, otherwise everything is | |
560 | * supported (see RFC4492). | |
561 | */ | |
562 | if (comp_id && s->session->tlsext_ecpointformatlist) { | |
563 | pformats = s->session->tlsext_ecpointformatlist; | |
564 | num_formats = s->session->tlsext_ecpointformatlist_length; | |
565 | for (i = 0; i < num_formats; i++, pformats++) { | |
566 | if (*comp_id == *pformats) | |
567 | break; | |
568 | } | |
569 | if (i == num_formats) | |
570 | return 0; | |
571 | } | |
572 | if (!curve_id) | |
573 | return 1; | |
574 | /* Check curve is consistent with client and server preferences */ | |
575 | for (j = 0; j <= 1; j++) { | |
576 | if (!tls1_get_curvelist(s, j, &pcurves, &num_curves)) | |
577 | return 0; | |
b79d2410 MC |
578 | if (j == 1 && num_curves == 0) { |
579 | /* | |
580 | * If we've not received any curves then skip this check. | |
581 | * RFC 4492 does not require the supported elliptic curves extension | |
582 | * so if it is not sent we can just choose any curve. | |
583 | * It is invalid to send an empty list in the elliptic curves | |
584 | * extension, so num_curves == 0 always means no extension. | |
585 | */ | |
586 | break; | |
587 | } | |
0f113f3e MC |
588 | for (i = 0; i < num_curves; i++, pcurves += 2) { |
589 | if (pcurves[0] == curve_id[0] && pcurves[1] == curve_id[1]) | |
590 | break; | |
591 | } | |
592 | if (i == num_curves) | |
593 | return 0; | |
594 | /* For clients can only check sent curve list */ | |
595 | if (!s->server) | |
596 | break; | |
597 | } | |
598 | return 1; | |
599 | } | |
d61ff83b | 600 | |
5087afa1 | 601 | static void tls1_get_formatlist(SSL *s, const unsigned char **pformats, |
0f113f3e MC |
602 | size_t *num_formats) |
603 | { | |
604 | /* | |
605 | * If we have a custom point format list use it otherwise use default | |
606 | */ | |
607 | if (s->tlsext_ecpointformatlist) { | |
608 | *pformats = s->tlsext_ecpointformatlist; | |
609 | *num_formats = s->tlsext_ecpointformatlist_length; | |
610 | } else { | |
611 | *pformats = ecformats_default; | |
612 | /* For Suite B we don't support char2 fields */ | |
613 | if (tls1_suiteb(s)) | |
614 | *num_formats = sizeof(ecformats_default) - 1; | |
615 | else | |
616 | *num_formats = sizeof(ecformats_default); | |
617 | } | |
618 | } | |
619 | ||
620 | /* | |
621 | * Check cert parameters compatible with extensions: currently just checks EC | |
622 | * certificates have compatible curves and compression. | |
d61ff83b | 623 | */ |
2ea80354 | 624 | static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md) |
0f113f3e MC |
625 | { |
626 | unsigned char comp_id, curve_id[2]; | |
627 | EVP_PKEY *pkey; | |
628 | int rv; | |
8382fd3a | 629 | pkey = X509_get0_pubkey(x); |
0f113f3e MC |
630 | if (!pkey) |
631 | return 0; | |
632 | /* If not EC nothing to do */ | |
3aeb9348 | 633 | if (EVP_PKEY_id(pkey) != EVP_PKEY_EC) |
0f113f3e | 634 | return 1; |
3aeb9348 | 635 | rv = tls1_set_ec_id(curve_id, &comp_id, EVP_PKEY_get0_EC_KEY(pkey)); |
0f113f3e MC |
636 | if (!rv) |
637 | return 0; | |
638 | /* | |
639 | * Can't check curve_id for client certs as we don't have a supported | |
640 | * curves extension. | |
641 | */ | |
642 | rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id); | |
643 | if (!rv) | |
644 | return 0; | |
645 | /* | |
646 | * Special case for suite B. We *MUST* sign using SHA256+P-256 or | |
647 | * SHA384+P-384, adjust digest if necessary. | |
648 | */ | |
649 | if (set_ee_md && tls1_suiteb(s)) { | |
650 | int check_md; | |
651 | size_t i; | |
652 | CERT *c = s->cert; | |
653 | if (curve_id[0]) | |
654 | return 0; | |
655 | /* Check to see we have necessary signing algorithm */ | |
656 | if (curve_id[1] == TLSEXT_curve_P_256) | |
657 | check_md = NID_ecdsa_with_SHA256; | |
658 | else if (curve_id[1] == TLSEXT_curve_P_384) | |
659 | check_md = NID_ecdsa_with_SHA384; | |
660 | else | |
661 | return 0; /* Should never happen */ | |
662 | for (i = 0; i < c->shared_sigalgslen; i++) | |
663 | if (check_md == c->shared_sigalgs[i].signandhash_nid) | |
664 | break; | |
665 | if (i == c->shared_sigalgslen) | |
666 | return 0; | |
667 | if (set_ee_md == 2) { | |
668 | if (check_md == NID_ecdsa_with_SHA256) | |
d376e57d | 669 | s->s3->tmp.md[SSL_PKEY_ECC] = EVP_sha256(); |
0f113f3e | 670 | else |
d376e57d | 671 | s->s3->tmp.md[SSL_PKEY_ECC] = EVP_sha384(); |
0f113f3e MC |
672 | } |
673 | } | |
674 | return rv; | |
675 | } | |
676 | ||
10bf4fc2 | 677 | # ifndef OPENSSL_NO_EC |
6977e8ee | 678 | /* |
8483a003 | 679 | * tls1_check_ec_tmp_key - Check EC temporary key compatibility |
6977e8ee KR |
680 | * @s: SSL connection |
681 | * @cid: Cipher ID we're considering using | |
682 | * | |
683 | * Checks that the kECDHE cipher suite we're considering using | |
684 | * is compatible with the client extensions. | |
685 | * | |
686 | * Returns 0 when the cipher can't be used or 1 when it can. | |
687 | */ | |
2ea80354 | 688 | int tls1_check_ec_tmp_key(SSL *s, unsigned long cid) |
0f113f3e | 689 | { |
0f113f3e MC |
690 | /* |
691 | * If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other | |
692 | * curves permitted. | |
693 | */ | |
694 | if (tls1_suiteb(s)) { | |
6977e8ee | 695 | unsigned char curve_id[2]; |
0f113f3e MC |
696 | /* Curve to check determined by ciphersuite */ |
697 | if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) | |
698 | curve_id[1] = TLSEXT_curve_P_256; | |
699 | else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) | |
700 | curve_id[1] = TLSEXT_curve_P_384; | |
701 | else | |
702 | return 0; | |
703 | curve_id[0] = 0; | |
704 | /* Check this curve is acceptable */ | |
705 | if (!tls1_check_ec_key(s, curve_id, NULL)) | |
706 | return 0; | |
fe6ef247 | 707 | return 1; |
0f113f3e | 708 | } |
fe6ef247 | 709 | /* Need a shared curve */ |
de4d764e | 710 | if (tls1_shared_group(s, 0)) |
fe6ef247 | 711 | return 1; |
6977e8ee | 712 | return 0; |
0f113f3e | 713 | } |
10bf4fc2 | 714 | # endif /* OPENSSL_NO_EC */ |
d0595f17 | 715 | |
14536c8c DSH |
716 | #else |
717 | ||
718 | static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md) | |
0f113f3e MC |
719 | { |
720 | return 1; | |
721 | } | |
14536c8c | 722 | |
0f113f3e | 723 | #endif /* OPENSSL_NO_EC */ |
f1fd4544 | 724 | |
0f113f3e MC |
725 | /* |
726 | * List of supported signature algorithms and hashes. Should make this | |
fc101f88 DSH |
727 | * customisable at some point, for now include everything we support. |
728 | */ | |
729 | ||
e481f9b9 | 730 | #ifdef OPENSSL_NO_RSA |
a230b26e | 731 | # define tlsext_sigalg_rsa(md) /* */ |
e481f9b9 MC |
732 | #else |
733 | # define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa, | |
734 | #endif | |
0f113f3e | 735 | |
e481f9b9 | 736 | #ifdef OPENSSL_NO_DSA |
a230b26e | 737 | # define tlsext_sigalg_dsa(md) /* */ |
e481f9b9 MC |
738 | #else |
739 | # define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa, | |
740 | #endif | |
0f113f3e | 741 | |
e481f9b9 | 742 | #ifdef OPENSSL_NO_EC |
a230b26e | 743 | # define tlsext_sigalg_ecdsa(md)/* */ |
e481f9b9 MC |
744 | #else |
745 | # define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa, | |
746 | #endif | |
0f113f3e | 747 | |
e481f9b9 | 748 | #define tlsext_sigalg(md) \ |
0f113f3e MC |
749 | tlsext_sigalg_rsa(md) \ |
750 | tlsext_sigalg_dsa(md) \ | |
751 | tlsext_sigalg_ecdsa(md) | |
fc101f88 | 752 | |
d97ed219 | 753 | static const unsigned char tls12_sigalgs[] = { |
0f113f3e MC |
754 | tlsext_sigalg(TLSEXT_hash_sha512) |
755 | tlsext_sigalg(TLSEXT_hash_sha384) | |
0f113f3e MC |
756 | tlsext_sigalg(TLSEXT_hash_sha256) |
757 | tlsext_sigalg(TLSEXT_hash_sha224) | |
0f113f3e | 758 | tlsext_sigalg(TLSEXT_hash_sha1) |
e44380a9 DB |
759 | #ifndef OPENSSL_NO_GOST |
760 | TLSEXT_hash_gostr3411, TLSEXT_signature_gostr34102001, | |
a230b26e EK |
761 | TLSEXT_hash_gostr34112012_256, TLSEXT_signature_gostr34102012_256, |
762 | TLSEXT_hash_gostr34112012_512, TLSEXT_signature_gostr34102012_512 | |
e44380a9 | 763 | #endif |
fc101f88 | 764 | }; |
0f113f3e | 765 | |
e481f9b9 | 766 | #ifndef OPENSSL_NO_EC |
d97ed219 | 767 | static const unsigned char suiteb_sigalgs[] = { |
0f113f3e MC |
768 | tlsext_sigalg_ecdsa(TLSEXT_hash_sha256) |
769 | tlsext_sigalg_ecdsa(TLSEXT_hash_sha384) | |
2ea80354 | 770 | }; |
e481f9b9 | 771 | #endif |
b7bfe69b | 772 | size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs) |
0f113f3e MC |
773 | { |
774 | /* | |
775 | * If Suite B mode use Suite B sigalgs only, ignore any other | |
776 | * preferences. | |
777 | */ | |
e481f9b9 | 778 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
779 | switch (tls1_suiteb(s)) { |
780 | case SSL_CERT_FLAG_SUITEB_128_LOS: | |
781 | *psigs = suiteb_sigalgs; | |
782 | return sizeof(suiteb_sigalgs); | |
783 | ||
784 | case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY: | |
785 | *psigs = suiteb_sigalgs; | |
786 | return 2; | |
787 | ||
788 | case SSL_CERT_FLAG_SUITEB_192_LOS: | |
789 | *psigs = suiteb_sigalgs + 2; | |
790 | return 2; | |
791 | } | |
e481f9b9 | 792 | #endif |
0f113f3e MC |
793 | /* If server use client authentication sigalgs if not NULL */ |
794 | if (s->server && s->cert->client_sigalgs) { | |
795 | *psigs = s->cert->client_sigalgs; | |
796 | return s->cert->client_sigalgslen; | |
797 | } else if (s->cert->conf_sigalgs) { | |
798 | *psigs = s->cert->conf_sigalgs; | |
799 | return s->cert->conf_sigalgslen; | |
800 | } else { | |
801 | *psigs = tls12_sigalgs; | |
802 | return sizeof(tls12_sigalgs); | |
803 | } | |
804 | } | |
805 | ||
806 | /* | |
807 | * Check signature algorithm is consistent with sent supported signature | |
ec4a50b3 DSH |
808 | * algorithms and if so return relevant digest. |
809 | */ | |
810 | int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s, | |
0f113f3e MC |
811 | const unsigned char *sig, EVP_PKEY *pkey) |
812 | { | |
813 | const unsigned char *sent_sigs; | |
814 | size_t sent_sigslen, i; | |
815 | int sigalg = tls12_get_sigid(pkey); | |
816 | /* Should never happen */ | |
817 | if (sigalg == -1) | |
818 | return -1; | |
819 | /* Check key type is consistent with signature */ | |
820 | if (sigalg != (int)sig[1]) { | |
821 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE); | |
822 | return 0; | |
823 | } | |
e481f9b9 | 824 | #ifndef OPENSSL_NO_EC |
3aeb9348 | 825 | if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { |
0f113f3e MC |
826 | unsigned char curve_id[2], comp_id; |
827 | /* Check compression and curve matches extensions */ | |
3aeb9348 | 828 | if (!tls1_set_ec_id(curve_id, &comp_id, EVP_PKEY_get0_EC_KEY(pkey))) |
0f113f3e MC |
829 | return 0; |
830 | if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id)) { | |
831 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE); | |
832 | return 0; | |
833 | } | |
834 | /* If Suite B only P-384+SHA384 or P-256+SHA-256 allowed */ | |
835 | if (tls1_suiteb(s)) { | |
836 | if (curve_id[0]) | |
837 | return 0; | |
838 | if (curve_id[1] == TLSEXT_curve_P_256) { | |
839 | if (sig[0] != TLSEXT_hash_sha256) { | |
840 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, | |
841 | SSL_R_ILLEGAL_SUITEB_DIGEST); | |
842 | return 0; | |
843 | } | |
844 | } else if (curve_id[1] == TLSEXT_curve_P_384) { | |
845 | if (sig[0] != TLSEXT_hash_sha384) { | |
846 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, | |
847 | SSL_R_ILLEGAL_SUITEB_DIGEST); | |
848 | return 0; | |
849 | } | |
850 | } else | |
851 | return 0; | |
852 | } | |
853 | } else if (tls1_suiteb(s)) | |
854 | return 0; | |
e481f9b9 | 855 | #endif |
0f113f3e MC |
856 | |
857 | /* Check signature matches a type we sent */ | |
858 | sent_sigslen = tls12_get_psigalgs(s, &sent_sigs); | |
859 | for (i = 0; i < sent_sigslen; i += 2, sent_sigs += 2) { | |
860 | if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1]) | |
861 | break; | |
862 | } | |
863 | /* Allow fallback to SHA1 if not strict mode */ | |
864 | if (i == sent_sigslen | |
865 | && (sig[0] != TLSEXT_hash_sha1 | |
866 | || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) { | |
867 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE); | |
868 | return 0; | |
869 | } | |
870 | *pmd = tls12_get_hash(sig[0]); | |
871 | if (*pmd == NULL) { | |
872 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_UNKNOWN_DIGEST); | |
873 | return 0; | |
874 | } | |
875 | /* Make sure security callback allows algorithm */ | |
876 | if (!ssl_security(s, SSL_SECOP_SIGALG_CHECK, | |
a230b26e | 877 | EVP_MD_size(*pmd) * 4, EVP_MD_type(*pmd), (void *)sig)) { |
0f113f3e MC |
878 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE); |
879 | return 0; | |
880 | } | |
881 | /* | |
882 | * Store the digest used so applications can retrieve it if they wish. | |
883 | */ | |
d376e57d | 884 | s->s3->tmp.peer_md = *pmd; |
0f113f3e MC |
885 | return 1; |
886 | } | |
2ea80354 | 887 | |
0f113f3e | 888 | /* |
3eb2aff4 KR |
889 | * Set a mask of disabled algorithms: an algorithm is disabled if it isn't |
890 | * supported, doesn't appear in supported signature algorithms, isn't supported | |
891 | * by the enabled protocol versions or by the security level. | |
892 | * | |
893 | * This function should only be used for checking which ciphers are supported | |
894 | * by the client. | |
895 | * | |
896 | * Call ssl_cipher_disabled() to check that it's enabled or not. | |
b7bfe69b DSH |
897 | */ |
898 | void ssl_set_client_disabled(SSL *s) | |
0f113f3e | 899 | { |
4d69f9e6 DSH |
900 | s->s3->tmp.mask_a = 0; |
901 | s->s3->tmp.mask_k = 0; | |
4d69f9e6 | 902 | ssl_set_sig_mask(&s->s3->tmp.mask_a, s, SSL_SECOP_SIGALG_MASK); |
3eb2aff4 | 903 | ssl_get_client_min_max_version(s, &s->s3->tmp.min_ver, &s->s3->tmp.max_ver); |
a230b26e | 904 | #ifndef OPENSSL_NO_PSK |
0f113f3e MC |
905 | /* with PSK there must be client callback set */ |
906 | if (!s->psk_client_callback) { | |
4d69f9e6 | 907 | s->s3->tmp.mask_a |= SSL_aPSK; |
fe5eef3a | 908 | s->s3->tmp.mask_k |= SSL_PSK; |
0f113f3e | 909 | } |
a230b26e | 910 | #endif /* OPENSSL_NO_PSK */ |
e481f9b9 | 911 | #ifndef OPENSSL_NO_SRP |
0f113f3e | 912 | if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) { |
4d69f9e6 DSH |
913 | s->s3->tmp.mask_a |= SSL_aSRP; |
914 | s->s3->tmp.mask_k |= SSL_kSRP; | |
0f113f3e | 915 | } |
e481f9b9 | 916 | #endif |
0f113f3e | 917 | } |
fc101f88 | 918 | |
3eb2aff4 KR |
919 | /* |
920 | * ssl_cipher_disabled - check that a cipher is disabled or not | |
921 | * @s: SSL connection that you want to use the cipher on | |
922 | * @c: cipher to check | |
923 | * @op: Security check that you want to do | |
924 | * | |
925 | * Returns 1 when it's disabled, 0 when enabled. | |
926 | */ | |
b362ccab | 927 | int ssl_cipher_disabled(SSL *s, const SSL_CIPHER *c, int op) |
0f113f3e | 928 | { |
3eb2aff4 | 929 | if (c->algorithm_mkey & s->s3->tmp.mask_k |
4d69f9e6 | 930 | || c->algorithm_auth & s->s3->tmp.mask_a) |
0f113f3e | 931 | return 1; |
3eb2aff4 KR |
932 | if (s->s3->tmp.max_ver == 0) |
933 | return 1; | |
934 | if (!SSL_IS_DTLS(s) && ((c->min_tls > s->s3->tmp.max_ver) | |
a230b26e | 935 | || (c->max_tls < s->s3->tmp.min_ver))) |
3eb2aff4 KR |
936 | return 1; |
937 | if (SSL_IS_DTLS(s) && (DTLS_VERSION_GT(c->min_dtls, s->s3->tmp.max_ver) | |
a230b26e | 938 | || DTLS_VERSION_LT(c->max_dtls, s->s3->tmp.min_ver))) |
3eb2aff4 KR |
939 | return 1; |
940 | ||
0f113f3e MC |
941 | return !ssl_security(s, op, c->strength_bits, 0, (void *)c); |
942 | } | |
b362ccab DSH |
943 | |
944 | static int tls_use_ticket(SSL *s) | |
0f113f3e MC |
945 | { |
946 | if (s->options & SSL_OP_NO_TICKET) | |
947 | return 0; | |
948 | return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL); | |
949 | } | |
ed3883d2 | 950 | |
a230b26e EK |
951 | static int compare_uint(const void *p1, const void *p2) |
952 | { | |
aa474d1f EK |
953 | unsigned int u1 = *((const unsigned int *)p1); |
954 | unsigned int u2 = *((const unsigned int *)p2); | |
955 | if (u1 < u2) | |
956 | return -1; | |
957 | else if (u1 > u2) | |
958 | return 1; | |
959 | else | |
960 | return 0; | |
961 | } | |
962 | ||
963 | /* | |
964 | * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be | |
965 | * more than one extension of the same type in a ClientHello or ServerHello. | |
966 | * This function does an initial scan over the extensions block to filter those | |
967 | * out. It returns 1 if all extensions are unique, and 0 if the extensions | |
968 | * contain duplicates, could not be successfully parsed, or an internal error | |
969 | * occurred. | |
970 | */ | |
a230b26e EK |
971 | static int tls1_check_duplicate_extensions(const PACKET *packet) |
972 | { | |
aa474d1f EK |
973 | PACKET extensions = *packet; |
974 | size_t num_extensions = 0, i = 0; | |
975 | unsigned int *extension_types = NULL; | |
976 | int ret = 0; | |
977 | ||
978 | /* First pass: count the extensions. */ | |
979 | while (PACKET_remaining(&extensions) > 0) { | |
980 | unsigned int type; | |
981 | PACKET extension; | |
982 | if (!PACKET_get_net_2(&extensions, &type) || | |
983 | !PACKET_get_length_prefixed_2(&extensions, &extension)) { | |
984 | goto done; | |
985 | } | |
986 | num_extensions++; | |
987 | } | |
988 | ||
989 | if (num_extensions <= 1) | |
990 | return 1; | |
991 | ||
992 | extension_types = OPENSSL_malloc(sizeof(unsigned int) * num_extensions); | |
993 | if (extension_types == NULL) { | |
994 | SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_MALLOC_FAILURE); | |
995 | goto done; | |
996 | } | |
997 | ||
998 | /* Second pass: gather the extension types. */ | |
999 | extensions = *packet; | |
1000 | for (i = 0; i < num_extensions; i++) { | |
1001 | PACKET extension; | |
1002 | if (!PACKET_get_net_2(&extensions, &extension_types[i]) || | |
1003 | !PACKET_get_length_prefixed_2(&extensions, &extension)) { | |
1004 | /* This should not happen. */ | |
1005 | SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_INTERNAL_ERROR); | |
1006 | goto done; | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | if (PACKET_remaining(&extensions) != 0) { | |
1011 | SSLerr(SSL_F_TLS1_CHECK_DUPLICATE_EXTENSIONS, ERR_R_INTERNAL_ERROR); | |
1012 | goto done; | |
1013 | } | |
1014 | /* Sort the extensions and make sure there are no duplicates. */ | |
1015 | qsort(extension_types, num_extensions, sizeof(unsigned int), compare_uint); | |
1016 | for (i = 1; i < num_extensions; i++) { | |
1017 | if (extension_types[i - 1] == extension_types[i]) | |
1018 | goto done; | |
1019 | } | |
1020 | ret = 1; | |
1021 | done: | |
1022 | OPENSSL_free(extension_types); | |
1023 | return ret; | |
1024 | } | |
1025 | ||
ae2f7b37 | 1026 | int ssl_add_clienthello_tlsext(SSL *s, WPACKET *pkt, int *al) |
0f113f3e | 1027 | { |
e481f9b9 | 1028 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
1029 | /* See if we support any ECC ciphersuites */ |
1030 | int using_ecc = 0; | |
1031 | if (s->version >= TLS1_VERSION || SSL_IS_DTLS(s)) { | |
1032 | int i; | |
1033 | unsigned long alg_k, alg_a; | |
1034 | STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s); | |
1035 | ||
1036 | for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) { | |
4a640fb6 | 1037 | const SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i); |
0f113f3e MC |
1038 | |
1039 | alg_k = c->algorithm_mkey; | |
1040 | alg_a = c->algorithm_auth; | |
ce0c1f2b | 1041 | if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) |
a230b26e | 1042 | || (alg_a & SSL_aECDSA)) { |
0f113f3e MC |
1043 | using_ecc = 1; |
1044 | break; | |
1045 | } | |
1046 | } | |
1047 | } | |
e481f9b9 | 1048 | #endif |
ed3883d2 | 1049 | |
0f113f3e MC |
1050 | /* Add RI if renegotiating */ |
1051 | if (s->renegotiate) { | |
08029dfa | 1052 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate) |
2f97192c MC |
1053 | || !WPACKET_start_sub_packet_u16(pkt) |
1054 | || !WPACKET_sub_memcpy_u8(pkt, s->s3->previous_client_finished, | |
1055 | s->s3->previous_client_finished_len) | |
1056 | || !WPACKET_close(pkt)) { | |
0f113f3e | 1057 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
2c7b4dbc | 1058 | return 0; |
5a3d8eeb | 1059 | } |
0f113f3e MC |
1060 | } |
1061 | /* Only add RI for SSLv3 */ | |
1062 | if (s->client_version == SSL3_VERSION) | |
1063 | goto done; | |
1064 | ||
1065 | if (s->tlsext_hostname != NULL) { | |
1066 | /* Add TLS extension servername to the Client Hello message */ | |
08029dfa | 1067 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name) |
2c7b4dbc | 1068 | /* Sub-packet for server_name extension */ |
de451856 | 1069 | || !WPACKET_start_sub_packet_u16(pkt) |
2c7b4dbc | 1070 | /* Sub-packet for servername list (always 1 hostname)*/ |
de451856 | 1071 | || !WPACKET_start_sub_packet_u16(pkt) |
08029dfa | 1072 | || !WPACKET_put_bytes_u8(pkt, TLSEXT_NAMETYPE_host_name) |
b2b3024e MC |
1073 | || !WPACKET_sub_memcpy_u16(pkt, s->tlsext_hostname, |
1074 | strlen(s->tlsext_hostname)) | |
0217dd19 MC |
1075 | || !WPACKET_close(pkt) |
1076 | || !WPACKET_close(pkt)) { | |
2c7b4dbc MC |
1077 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1078 | return 0; | |
1079 | } | |
0f113f3e | 1080 | } |
e481f9b9 | 1081 | #ifndef OPENSSL_NO_SRP |
0f113f3e | 1082 | /* Add SRP username if there is one */ |
2c7b4dbc | 1083 | if (s->srp_ctx.login != NULL) { |
08029dfa | 1084 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_srp) |
2c7b4dbc | 1085 | /* Sub-packet for SRP extension */ |
de451856 MC |
1086 | || !WPACKET_start_sub_packet_u16(pkt) |
1087 | || !WPACKET_start_sub_packet_u8(pkt) | |
2c7b4dbc | 1088 | /* login must not be zero...internal error if so */ |
de451856 | 1089 | || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH) |
0217dd19 | 1090 | || !WPACKET_memcpy(pkt, s->srp_ctx.login, |
2c7b4dbc | 1091 | strlen(s->srp_ctx.login)) |
0217dd19 MC |
1092 | || !WPACKET_close(pkt) |
1093 | || !WPACKET_close(pkt)) { | |
0f113f3e | 1094 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
2c7b4dbc | 1095 | return 0; |
0f113f3e | 1096 | } |
0f113f3e | 1097 | } |
e481f9b9 | 1098 | #endif |
0f113f3e | 1099 | |
e481f9b9 | 1100 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
1101 | if (using_ecc) { |
1102 | /* | |
1103 | * Add TLS extension ECPointFormats to the ClientHello message | |
1104 | */ | |
0f113f3e | 1105 | const unsigned char *pcurves, *pformats; |
2c7b4dbc | 1106 | size_t num_curves, num_formats; |
0f113f3e | 1107 | size_t i; |
0f113f3e MC |
1108 | |
1109 | tls1_get_formatlist(s, &pformats, &num_formats); | |
1110 | ||
08029dfa | 1111 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats) |
2c7b4dbc | 1112 | /* Sub-packet for formats extension */ |
de451856 | 1113 | || !WPACKET_start_sub_packet_u16(pkt) |
b2b3024e | 1114 | || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats) |
0217dd19 | 1115 | || !WPACKET_close(pkt)) { |
0f113f3e | 1116 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
2c7b4dbc | 1117 | return 0; |
0f113f3e | 1118 | } |
4817504d | 1119 | |
0f113f3e | 1120 | /* |
de4d764e | 1121 | * Add TLS extension supported_groups to the ClientHello message |
0f113f3e | 1122 | */ |
de4d764e MC |
1123 | /* TODO(TLS1.3): Add support for DHE groups */ |
1124 | pcurves = s->tlsext_supportedgroupslist; | |
2c7b4dbc | 1125 | if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) { |
0f113f3e | 1126 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
2c7b4dbc | 1127 | return 0; |
0f113f3e | 1128 | } |
ee2ffc27 | 1129 | |
de4d764e MC |
1130 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups) |
1131 | /* Sub-packet for supported_groups extension */ | |
de451856 MC |
1132 | || !WPACKET_start_sub_packet_u16(pkt) |
1133 | || !WPACKET_start_sub_packet_u16(pkt)) { | |
2c7b4dbc MC |
1134 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1135 | return 0; | |
1136 | } | |
0f113f3e MC |
1137 | /* Copy curve ID if supported */ |
1138 | for (i = 0; i < num_curves; i++, pcurves += 2) { | |
1139 | if (tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) { | |
08029dfa MC |
1140 | if (!WPACKET_put_bytes_u8(pkt, pcurves[0]) |
1141 | || !WPACKET_put_bytes_u8(pkt, pcurves[1])) { | |
2c7b4dbc MC |
1142 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, |
1143 | ERR_R_INTERNAL_ERROR); | |
1144 | return 0; | |
1145 | } | |
0f113f3e MC |
1146 | } |
1147 | } | |
0217dd19 | 1148 | if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) { |
2c7b4dbc MC |
1149 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1150 | return 0; | |
1151 | } | |
0f113f3e | 1152 | } |
a230b26e | 1153 | #endif /* OPENSSL_NO_EC */ |
0f113f3e MC |
1154 | |
1155 | if (tls_use_ticket(s)) { | |
348240c6 | 1156 | size_t ticklen; |
0f113f3e MC |
1157 | if (!s->new_session && s->session && s->session->tlsext_tick) |
1158 | ticklen = s->session->tlsext_ticklen; | |
1159 | else if (s->session && s->tlsext_session_ticket && | |
1160 | s->tlsext_session_ticket->data) { | |
1161 | ticklen = s->tlsext_session_ticket->length; | |
1162 | s->session->tlsext_tick = OPENSSL_malloc(ticklen); | |
2c7b4dbc MC |
1163 | if (s->session->tlsext_tick == NULL) { |
1164 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1165 | return 0; | |
1166 | } | |
0f113f3e MC |
1167 | memcpy(s->session->tlsext_tick, |
1168 | s->tlsext_session_ticket->data, ticklen); | |
1169 | s->session->tlsext_ticklen = ticklen; | |
1170 | } else | |
1171 | ticklen = 0; | |
1172 | if (ticklen == 0 && s->tlsext_session_ticket && | |
1173 | s->tlsext_session_ticket->data == NULL) | |
1174 | goto skip_ext; | |
2c7b4dbc | 1175 | |
08029dfa | 1176 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket) |
b2b3024e MC |
1177 | || !WPACKET_sub_memcpy_u16(pkt, s->session->tlsext_tick, |
1178 | ticklen)) { | |
2c7b4dbc MC |
1179 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1180 | return 0; | |
0f113f3e MC |
1181 | } |
1182 | } | |
1183 | skip_ext: | |
1184 | ||
f7aa3185 | 1185 | if (SSL_CLIENT_USE_SIGALGS(s)) { |
0f113f3e MC |
1186 | size_t salglen; |
1187 | const unsigned char *salg; | |
2c7b4dbc | 1188 | |
0f113f3e | 1189 | salglen = tls12_get_psigalgs(s, &salg); |
2c7b4dbc | 1190 | |
08029dfa | 1191 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms) |
2c7b4dbc | 1192 | /* Sub-packet for sig-algs extension */ |
de451856 | 1193 | || !WPACKET_start_sub_packet_u16(pkt) |
2c7b4dbc | 1194 | /* Sub-packet for the actual list */ |
de451856 | 1195 | || !WPACKET_start_sub_packet_u16(pkt) |
0217dd19 MC |
1196 | || !tls12_copy_sigalgs(s, pkt, salg, salglen) |
1197 | || !WPACKET_close(pkt) | |
1198 | || !WPACKET_close(pkt)) { | |
2c7b4dbc MC |
1199 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1200 | return 0; | |
1201 | } | |
0f113f3e | 1202 | } |
3e41ac35 | 1203 | #ifndef OPENSSL_NO_OCSP |
0f113f3e MC |
1204 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) { |
1205 | int i; | |
0f113f3e | 1206 | |
08029dfa | 1207 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request) |
2c7b4dbc | 1208 | /* Sub-packet for status request extension */ |
de451856 | 1209 | || !WPACKET_start_sub_packet_u16(pkt) |
08029dfa | 1210 | || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp) |
2c7b4dbc | 1211 | /* Sub-packet for the ids */ |
de451856 | 1212 | || !WPACKET_start_sub_packet_u16(pkt)) { |
2c7b4dbc MC |
1213 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1214 | return 0; | |
1215 | } | |
0f113f3e | 1216 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) { |
2c7b4dbc MC |
1217 | unsigned char *idbytes; |
1218 | int idlen; | |
1219 | OCSP_RESPID *id; | |
2c7b4dbc | 1220 | |
0f113f3e | 1221 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); |
2c7b4dbc MC |
1222 | idlen = i2d_OCSP_RESPID(id, NULL); |
1223 | if (idlen <= 0 | |
1224 | /* Sub-packet for an individual id */ | |
dd8710dc | 1225 | || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes) |
b2b3024e | 1226 | || i2d_OCSP_RESPID(id, &idbytes) != idlen) { |
2c7b4dbc MC |
1227 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1228 | return 0; | |
1229 | } | |
1230 | } | |
0217dd19 | 1231 | if (!WPACKET_close(pkt) |
de451856 | 1232 | || !WPACKET_start_sub_packet_u16(pkt)) { |
2c7b4dbc MC |
1233 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1234 | return 0; | |
860c3dd1 | 1235 | } |
0f113f3e | 1236 | if (s->tlsext_ocsp_exts) { |
2c7b4dbc MC |
1237 | unsigned char *extbytes; |
1238 | int extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); | |
0f113f3e | 1239 | |
2c7b4dbc MC |
1240 | if (extlen < 0) { |
1241 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1242 | return 0; | |
1243 | } | |
0217dd19 | 1244 | if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes) |
2c7b4dbc MC |
1245 | || i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &extbytes) |
1246 | != extlen) { | |
1247 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1248 | return 0; | |
1249 | } | |
1250 | } | |
0217dd19 | 1251 | if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) { |
2c7b4dbc MC |
1252 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1253 | return 0; | |
0f113f3e | 1254 | } |
0f113f3e | 1255 | } |
3e41ac35 | 1256 | #endif |
e481f9b9 | 1257 | #ifndef OPENSSL_NO_HEARTBEATS |
22e3dcb7 | 1258 | if (SSL_IS_DTLS(s)) { |
2c7b4dbc MC |
1259 | unsigned int mode; |
1260 | ||
22e3dcb7 RS |
1261 | /*- |
1262 | * Set mode: | |
1263 | * 1: peer may send requests | |
1264 | * 2: peer not allowed to send requests | |
1265 | */ | |
1266 | if (s->tlsext_heartbeat & SSL_DTLSEXT_HB_DONT_RECV_REQUESTS) | |
2c7b4dbc | 1267 | mode = SSL_DTLSEXT_HB_DONT_SEND_REQUESTS; |
22e3dcb7 | 1268 | else |
2c7b4dbc MC |
1269 | mode = SSL_DTLSEXT_HB_ENABLED; |
1270 | ||
08029dfa | 1271 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_heartbeat) |
2c7b4dbc | 1272 | /* Sub-packet for Hearbeat extension */ |
de451856 | 1273 | || !WPACKET_start_sub_packet_u16(pkt) |
08029dfa | 1274 | || !WPACKET_put_bytes_u8(pkt, mode) |
0217dd19 | 1275 | || !WPACKET_close(pkt)) { |
2c7b4dbc MC |
1276 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1277 | return 0; | |
1278 | } | |
22e3dcb7 | 1279 | } |
e481f9b9 | 1280 | #endif |
0f113f3e | 1281 | |
e481f9b9 | 1282 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
1283 | if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len) { |
1284 | /* | |
8483a003 | 1285 | * The client advertises an empty extension to indicate its support |
0f113f3e MC |
1286 | * for Next Protocol Negotiation |
1287 | */ | |
08029dfa MC |
1288 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg) |
1289 | || !WPACKET_put_bytes_u16(pkt, 0)) { | |
2c7b4dbc MC |
1290 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1291 | return 0; | |
1292 | } | |
0f113f3e | 1293 | } |
e481f9b9 | 1294 | #endif |
0f113f3e | 1295 | |
817cd0d5 TS |
1296 | /* |
1297 | * finish_md_len is non-zero during a renegotiation, so | |
1298 | * this avoids sending ALPN during the renegotiation | |
1299 | * (see longer comment below) | |
1300 | */ | |
0f113f3e | 1301 | if (s->alpn_client_proto_list && !s->s3->tmp.finish_md_len) { |
08029dfa MC |
1302 | if (!WPACKET_put_bytes_u16(pkt, |
1303 | TLSEXT_TYPE_application_layer_protocol_negotiation) | |
2c7b4dbc | 1304 | /* Sub-packet ALPN extension */ |
de451856 | 1305 | || !WPACKET_start_sub_packet_u16(pkt) |
b2b3024e MC |
1306 | || !WPACKET_sub_memcpy_u16(pkt, s->alpn_client_proto_list, |
1307 | s->alpn_client_proto_list_len) | |
0217dd19 | 1308 | || !WPACKET_close(pkt)) { |
2c7b4dbc MC |
1309 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1310 | return 0; | |
1311 | } | |
817cd0d5 | 1312 | s->s3->alpn_sent = 1; |
0f113f3e | 1313 | } |
e481f9b9 | 1314 | #ifndef OPENSSL_NO_SRTP |
0f113f3e | 1315 | if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)) { |
7facdbd6 | 1316 | STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s); |
2c7b4dbc MC |
1317 | SRTP_PROTECTION_PROFILE *prof; |
1318 | int i, ct; | |
2c7b4dbc | 1319 | |
08029dfa | 1320 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp) |
2c7b4dbc | 1321 | /* Sub-packet for SRTP extension */ |
de451856 | 1322 | || !WPACKET_start_sub_packet_u16(pkt) |
2c7b4dbc | 1323 | /* Sub-packet for the protection profile list */ |
de451856 | 1324 | || !WPACKET_start_sub_packet_u16(pkt)) { |
69f68237 | 1325 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
2c7b4dbc | 1326 | return 0; |
69f68237 | 1327 | } |
2c7b4dbc MC |
1328 | ct = sk_SRTP_PROTECTION_PROFILE_num(clnt); |
1329 | for (i = 0; i < ct; i++) { | |
1330 | prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i); | |
08029dfa | 1331 | if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) { |
2c7b4dbc MC |
1332 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1333 | return 0; | |
1334 | } | |
1335 | } | |
7facdbd6 MC |
1336 | if (!WPACKET_close(pkt) |
1337 | /* Add an empty use_mki value */ | |
1338 | || !WPACKET_put_bytes_u8(pkt, 0) | |
1339 | || !WPACKET_close(pkt)) { | |
0f113f3e | 1340 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
2c7b4dbc | 1341 | return 0; |
0f113f3e | 1342 | } |
0f113f3e | 1343 | } |
e481f9b9 | 1344 | #endif |
0f113f3e MC |
1345 | custom_ext_init(&s->cert->cli_ext); |
1346 | /* Add custom TLS Extensions to ClientHello */ | |
2c7b4dbc MC |
1347 | if (!custom_ext_add(s, 0, pkt, al)) { |
1348 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1349 | return 0; | |
1350 | } | |
1351 | ||
cde6145b DW |
1352 | if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)) { |
1353 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac) | |
08029dfa | 1354 | || !WPACKET_put_bytes_u16(pkt, 0)) { |
cde6145b DW |
1355 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1356 | return 0; | |
1357 | } | |
2c7b4dbc MC |
1358 | } |
1359 | ||
ed29e82a RP |
1360 | #ifndef OPENSSL_NO_CT |
1361 | if (s->ct_validation_callback != NULL) { | |
08029dfa MC |
1362 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signed_certificate_timestamp) |
1363 | || !WPACKET_put_bytes_u16(pkt, 0)) { | |
2c7b4dbc MC |
1364 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1365 | return 0; | |
1366 | } | |
ed29e82a | 1367 | } |
e481f9b9 | 1368 | #endif |
2c7b4dbc | 1369 | |
08029dfa MC |
1370 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret) |
1371 | || !WPACKET_put_bytes_u16(pkt, 0)) { | |
2c7b4dbc MC |
1372 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1373 | return 0; | |
1374 | } | |
0f113f3e | 1375 | |
f2342b7a | 1376 | if (SSL_IS_TLS13(s)) { |
b5b253b1 MC |
1377 | int min_version, max_version, reason, currv; |
1378 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions) | |
1379 | || !WPACKET_start_sub_packet_u16(pkt) | |
1380 | || !WPACKET_start_sub_packet_u8(pkt)) { | |
1381 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1382 | return 0; | |
1383 | } | |
1384 | reason = ssl_get_client_min_max_version(s, &min_version, &max_version); | |
1385 | if (reason != 0) { | |
1386 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, reason); | |
1387 | return 0; | |
1388 | } | |
f2342b7a MC |
1389 | /* |
1390 | * TODO(TLS1.3): There is some discussion on the TLS list as to wheter | |
1391 | * we should include versions <TLS1.2. For the moment we do. To be | |
1392 | * reviewed later. | |
1393 | */ | |
b5b253b1 MC |
1394 | for (currv = max_version; currv >= min_version; currv--) { |
1395 | /* TODO(TLS1.3): Remove this first if clause prior to release!! */ | |
1396 | if (currv == TLS1_3_VERSION) { | |
1397 | if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) { | |
1398 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, | |
1399 | ERR_R_INTERNAL_ERROR); | |
1400 | return 0; | |
1401 | } | |
1402 | } else if (!WPACKET_put_bytes_u16(pkt, currv)) { | |
1403 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1404 | return 0; | |
1405 | } | |
1406 | } | |
1407 | if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) { | |
1408 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1409 | return 0; | |
1410 | } | |
1411 | } | |
1412 | ||
0f113f3e MC |
1413 | /* |
1414 | * Add padding to workaround bugs in F5 terminators. See | |
1415 | * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this | |
1416 | * code works out the length of all existing extensions it MUST always | |
1417 | * appear last. | |
1418 | */ | |
1419 | if (s->options & SSL_OP_TLSEXT_PADDING) { | |
2c7b4dbc MC |
1420 | unsigned char *padbytes; |
1421 | size_t hlen; | |
1422 | ||
ae2f7b37 | 1423 | if (!WPACKET_get_total_written(pkt, &hlen)) { |
2c7b4dbc MC |
1424 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1425 | return 0; | |
1426 | } | |
a3680c8f | 1427 | |
0f113f3e MC |
1428 | if (hlen > 0xff && hlen < 0x200) { |
1429 | hlen = 0x200 - hlen; | |
1430 | if (hlen >= 4) | |
1431 | hlen -= 4; | |
1432 | else | |
1433 | hlen = 0; | |
1434 | ||
08029dfa | 1435 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_padding) |
b2b3024e | 1436 | || !WPACKET_sub_allocate_bytes_u16(pkt, hlen, &padbytes)) { |
2c7b4dbc MC |
1437 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
1438 | return 0; | |
1439 | } | |
1440 | memset(padbytes, 0, hlen); | |
0f113f3e MC |
1441 | } |
1442 | } | |
5a3d8eeb | 1443 | |
0f113f3e | 1444 | done: |
2c7b4dbc | 1445 | return 1; |
0f113f3e | 1446 | } |
333f926d | 1447 | |
8157d44b | 1448 | int ssl_add_serverhello_tlsext(SSL *s, WPACKET *pkt, int *al) |
0f113f3e | 1449 | { |
e481f9b9 | 1450 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e | 1451 | int next_proto_neg_seen; |
e481f9b9 MC |
1452 | #endif |
1453 | #ifndef OPENSSL_NO_EC | |
0f113f3e MC |
1454 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
1455 | unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
ce0c1f2b | 1456 | int using_ecc = (alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA); |
0f113f3e | 1457 | using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL); |
e481f9b9 | 1458 | #endif |
0f113f3e | 1459 | |
8157d44b MC |
1460 | if (!WPACKET_start_sub_packet_u16(pkt) |
1461 | || !WPACKET_set_flags(pkt, WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH)) { | |
1462 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1463 | return 0; | |
1464 | } | |
333f926d | 1465 | |
8157d44b MC |
1466 | if (s->s3->send_connection_binding && |
1467 | !ssl_add_serverhello_renegotiate_ext(s, pkt)) { | |
1468 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1469 | return 0; | |
0f113f3e MC |
1470 | } |
1471 | ||
1472 | /* Only add RI for SSLv3 */ | |
1473 | if (s->version == SSL3_VERSION) | |
1474 | goto done; | |
1475 | ||
1476 | if (!s->hit && s->servername_done == 1 | |
8157d44b MC |
1477 | && s->session->tlsext_hostname != NULL) { |
1478 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name) | |
1479 | || !WPACKET_put_bytes_u16(pkt, 0)) { | |
1480 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1481 | return 0; | |
1482 | } | |
0f113f3e | 1483 | } |
e481f9b9 | 1484 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
1485 | if (using_ecc) { |
1486 | const unsigned char *plist; | |
1487 | size_t plistlen; | |
1488 | /* | |
1489 | * Add TLS extension ECPointFormats to the ServerHello message | |
1490 | */ | |
0f113f3e MC |
1491 | tls1_get_formatlist(s, &plist, &plistlen); |
1492 | ||
8157d44b MC |
1493 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats) |
1494 | || !WPACKET_start_sub_packet_u16(pkt) | |
1495 | || !WPACKET_sub_memcpy_u8(pkt, plist, plistlen) | |
1496 | || !WPACKET_close(pkt)) { | |
0f113f3e | 1497 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
8157d44b | 1498 | return 0; |
0f113f3e | 1499 | } |
0f113f3e MC |
1500 | } |
1501 | /* | |
1502 | * Currently the server should not respond with a SupportedCurves | |
1503 | * extension | |
1504 | */ | |
a230b26e | 1505 | #endif /* OPENSSL_NO_EC */ |
0f113f3e MC |
1506 | |
1507 | if (s->tlsext_ticket_expected && tls_use_ticket(s)) { | |
8157d44b MC |
1508 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_session_ticket) |
1509 | || !WPACKET_put_bytes_u16(pkt, 0)) { | |
1510 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1511 | return 0; | |
1512 | } | |
5c753de6 | 1513 | } else { |
a230b26e EK |
1514 | /* |
1515 | * if we don't add the above TLSEXT, we can't add a session ticket | |
1516 | * later | |
1517 | */ | |
5c753de6 | 1518 | s->tlsext_ticket_expected = 0; |
0f113f3e MC |
1519 | } |
1520 | ||
1521 | if (s->tlsext_status_expected) { | |
8157d44b MC |
1522 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request) |
1523 | || !WPACKET_put_bytes_u16(pkt, 0)) { | |
1524 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1525 | return 0; | |
1526 | } | |
0f113f3e | 1527 | } |
e481f9b9 | 1528 | #ifndef OPENSSL_NO_SRTP |
0f113f3e | 1529 | if (SSL_IS_DTLS(s) && s->srtp_profile) { |
8157d44b MC |
1530 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp) |
1531 | || !WPACKET_start_sub_packet_u16(pkt) | |
1532 | || !WPACKET_put_bytes_u16(pkt, 2) | |
1533 | || !WPACKET_put_bytes_u16(pkt, s->srtp_profile->id) | |
1534 | || !WPACKET_put_bytes_u8(pkt, 0) | |
1535 | || !WPACKET_close(pkt)) { | |
0f113f3e | 1536 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
8157d44b | 1537 | return 0; |
0f113f3e | 1538 | } |
0f113f3e | 1539 | } |
e481f9b9 | 1540 | #endif |
0f113f3e MC |
1541 | |
1542 | if (((s->s3->tmp.new_cipher->id & 0xFFFF) == 0x80 | |
1543 | || (s->s3->tmp.new_cipher->id & 0xFFFF) == 0x81) | |
1544 | && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) { | |
1545 | const unsigned char cryptopro_ext[36] = { | |
1546 | 0xfd, 0xe8, /* 65000 */ | |
1547 | 0x00, 0x20, /* 32 bytes length */ | |
1548 | 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85, | |
1549 | 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06, | |
1550 | 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08, | |
1551 | 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17 | |
1552 | }; | |
8157d44b MC |
1553 | if (!WPACKET_memcpy(pkt, cryptopro_ext, sizeof(cryptopro_ext))) { |
1554 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1555 | return 0; | |
1556 | } | |
0f113f3e | 1557 | } |
e481f9b9 | 1558 | #ifndef OPENSSL_NO_HEARTBEATS |
0f113f3e | 1559 | /* Add Heartbeat extension if we've received one */ |
22e3dcb7 | 1560 | if (SSL_IS_DTLS(s) && (s->tlsext_heartbeat & SSL_DTLSEXT_HB_ENABLED)) { |
7507e73d | 1561 | unsigned int mode; |
50e735f9 MC |
1562 | /*- |
1563 | * Set mode: | |
1564 | * 1: peer may send requests | |
1565 | * 2: peer not allowed to send requests | |
1566 | */ | |
22e3dcb7 | 1567 | if (s->tlsext_heartbeat & SSL_DTLSEXT_HB_DONT_RECV_REQUESTS) |
8157d44b | 1568 | mode = SSL_DTLSEXT_HB_DONT_SEND_REQUESTS; |
0f113f3e | 1569 | else |
8157d44b MC |
1570 | mode = SSL_DTLSEXT_HB_ENABLED; |
1571 | ||
1572 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_heartbeat) | |
1573 | || !WPACKET_start_sub_packet_u16(pkt) | |
1574 | || !WPACKET_put_bytes_u8(pkt, mode) | |
1575 | || !WPACKET_close(pkt)) { | |
1576 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1577 | return 0; | |
1578 | } | |
0f113f3e MC |
1579 | |
1580 | } | |
e481f9b9 | 1581 | #endif |
0f113f3e | 1582 | |
e481f9b9 | 1583 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
1584 | next_proto_neg_seen = s->s3->next_proto_neg_seen; |
1585 | s->s3->next_proto_neg_seen = 0; | |
1586 | if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb) { | |
1587 | const unsigned char *npa; | |
1588 | unsigned int npalen; | |
1589 | int r; | |
1590 | ||
1591 | r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, | |
1592 | s-> | |
1593 | ctx->next_protos_advertised_cb_arg); | |
1594 | if (r == SSL_TLSEXT_ERR_OK) { | |
8157d44b MC |
1595 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_next_proto_neg) |
1596 | || !WPACKET_sub_memcpy_u16(pkt, npa, npalen)) { | |
1597 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1598 | return 0; | |
1599 | } | |
0f113f3e MC |
1600 | s->s3->next_proto_neg_seen = 1; |
1601 | } | |
1602 | } | |
e481f9b9 | 1603 | #endif |
8157d44b MC |
1604 | if (!custom_ext_add(s, 1, pkt, al)) { |
1605 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1606 | return 0; | |
1607 | } | |
1608 | ||
0f113f3e MC |
1609 | if (s->s3->flags & TLS1_FLAGS_ENCRYPT_THEN_MAC) { |
1610 | /* | |
1611 | * Don't use encrypt_then_mac if AEAD or RC4 might want to disable | |
1612 | * for other cases too. | |
1613 | */ | |
1614 | if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD | |
e44380a9 DB |
1615 | || s->s3->tmp.new_cipher->algorithm_enc == SSL_RC4 |
1616 | || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT | |
1617 | || s->s3->tmp.new_cipher->algorithm_enc == SSL_eGOST2814789CNT12) | |
0f113f3e MC |
1618 | s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC; |
1619 | else { | |
8157d44b MC |
1620 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_encrypt_then_mac) |
1621 | || !WPACKET_put_bytes_u16(pkt, 0)) { | |
1622 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1623 | return 0; | |
1624 | } | |
0f113f3e MC |
1625 | } |
1626 | } | |
e7f0d921 | 1627 | if (s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) { |
8157d44b MC |
1628 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_extended_master_secret) |
1629 | || !WPACKET_put_bytes_u16(pkt, 0)) { | |
1630 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1631 | return 0; | |
1632 | } | |
ddc06b35 | 1633 | } |
0f113f3e | 1634 | |
817cd0d5 | 1635 | if (s->s3->alpn_selected != NULL) { |
8157d44b MC |
1636 | if (!WPACKET_put_bytes_u16(pkt, |
1637 | TLSEXT_TYPE_application_layer_protocol_negotiation) | |
1638 | || !WPACKET_start_sub_packet_u16(pkt) | |
1639 | || !WPACKET_start_sub_packet_u16(pkt) | |
1640 | || !WPACKET_sub_memcpy_u8(pkt, s->s3->alpn_selected, | |
1641 | s->s3->alpn_selected_len) | |
1642 | || !WPACKET_close(pkt) | |
1643 | || !WPACKET_close(pkt)) { | |
1644 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1645 | return 0; | |
1646 | } | |
0f113f3e MC |
1647 | } |
1648 | ||
1649 | done: | |
8157d44b MC |
1650 | if (!WPACKET_close(pkt)) { |
1651 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1652 | return 0; | |
1653 | } | |
1654 | return 1; | |
0f113f3e | 1655 | } |
a398f821 | 1656 | |
0f113f3e | 1657 | /* |
817cd0d5 | 1658 | * Save the ALPN extension in a ClientHello. |
06217867 EK |
1659 | * pkt: the contents of the ALPN extension, not including type and length. |
1660 | * al: a pointer to the alert value to send in the event of a failure. | |
1661 | * returns: 1 on success, 0 on error. | |
0f113f3e | 1662 | */ |
9ceb2426 | 1663 | static int tls1_alpn_handle_client_hello(SSL *s, PACKET *pkt, int *al) |
0f113f3e | 1664 | { |
06217867 | 1665 | PACKET protocol_list, save_protocol_list, protocol; |
0f113f3e | 1666 | |
06217867 | 1667 | *al = SSL_AD_DECODE_ERROR; |
0f113f3e | 1668 | |
06217867 EK |
1669 | if (!PACKET_as_length_prefixed_2(pkt, &protocol_list) |
1670 | || PACKET_remaining(&protocol_list) < 2) { | |
1671 | return 0; | |
1672 | } | |
0f113f3e | 1673 | |
06217867 | 1674 | save_protocol_list = protocol_list; |
9ceb2426 | 1675 | do { |
06217867 EK |
1676 | /* Protocol names can't be empty. */ |
1677 | if (!PACKET_get_length_prefixed_1(&protocol_list, &protocol) | |
1678 | || PACKET_remaining(&protocol) == 0) { | |
1679 | return 0; | |
1680 | } | |
1681 | } while (PACKET_remaining(&protocol_list) != 0); | |
1682 | ||
817cd0d5 | 1683 | if (!PACKET_memdup(&save_protocol_list, |
a230b26e | 1684 | &s->s3->alpn_proposed, &s->s3->alpn_proposed_len)) { |
817cd0d5 TS |
1685 | *al = TLS1_AD_INTERNAL_ERROR; |
1686 | return 0; | |
1687 | } | |
1688 | ||
1689 | return 1; | |
1690 | } | |
1691 | ||
1692 | /* | |
1693 | * Process the ALPN extension in a ClientHello. | |
817cd0d5 | 1694 | * al: a pointer to the alert value to send in the event of a failure. |
70c22888 | 1695 | * returns 1 on success, 0 on error. |
817cd0d5 | 1696 | */ |
70c22888 | 1697 | static int tls1_alpn_handle_client_hello_late(SSL *s, int *al) |
817cd0d5 TS |
1698 | { |
1699 | const unsigned char *selected = NULL; | |
1700 | unsigned char selected_len = 0; | |
1701 | ||
1702 | if (s->ctx->alpn_select_cb != NULL && s->s3->alpn_proposed != NULL) { | |
1703 | int r = s->ctx->alpn_select_cb(s, &selected, &selected_len, | |
1704 | s->s3->alpn_proposed, | |
348240c6 | 1705 | (unsigned int)s->s3->alpn_proposed_len, |
817cd0d5 | 1706 | s->ctx->alpn_select_cb_arg); |
0f113f3e | 1707 | |
817cd0d5 TS |
1708 | if (r == SSL_TLSEXT_ERR_OK) { |
1709 | OPENSSL_free(s->s3->alpn_selected); | |
1710 | s->s3->alpn_selected = OPENSSL_memdup(selected, selected_len); | |
1711 | if (s->s3->alpn_selected == NULL) { | |
1712 | *al = SSL_AD_INTERNAL_ERROR; | |
817cd0d5 TS |
1713 | return 0; |
1714 | } | |
1715 | s->s3->alpn_selected_len = selected_len; | |
0351baae TS |
1716 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1717 | /* ALPN takes precedence over NPN. */ | |
1718 | s->s3->next_proto_neg_seen = 0; | |
1719 | #endif | |
817cd0d5 TS |
1720 | } else { |
1721 | *al = SSL_AD_NO_APPLICATION_PROTOCOL; | |
06217867 | 1722 | return 0; |
0f113f3e | 1723 | } |
0f113f3e | 1724 | } |
0f113f3e | 1725 | |
06217867 | 1726 | return 1; |
0f113f3e | 1727 | } |
6f017a8f | 1728 | |
e481f9b9 | 1729 | #ifndef OPENSSL_NO_EC |
1d97c843 TH |
1730 | /*- |
1731 | * ssl_check_for_safari attempts to fingerprint Safari using OS X | |
3d33f3bb | 1732 | * SecureTransport using the TLS extension block in |hello|. |
dece3209 RS |
1733 | * Safari, since 10.6, sends exactly these extensions, in this order: |
1734 | * SNI, | |
1735 | * elliptic_curves | |
1736 | * ec_point_formats | |
1737 | * | |
1738 | * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8, | |
1739 | * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them. | |
1740 | * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from | |
1741 | * 10.8..10.8.3 (which don't work). | |
1742 | */ | |
902aca09 | 1743 | static void ssl_check_for_safari(SSL *s, const CLIENTHELLO_MSG *hello) |
0f113f3e | 1744 | { |
06217867 EK |
1745 | unsigned int type; |
1746 | PACKET sni, tmppkt; | |
1747 | size_t ext_len; | |
9ceb2426 | 1748 | |
0f113f3e MC |
1749 | static const unsigned char kSafariExtensionsBlock[] = { |
1750 | 0x00, 0x0a, /* elliptic_curves extension */ | |
1751 | 0x00, 0x08, /* 8 bytes */ | |
1752 | 0x00, 0x06, /* 6 bytes of curve ids */ | |
1753 | 0x00, 0x17, /* P-256 */ | |
1754 | 0x00, 0x18, /* P-384 */ | |
1755 | 0x00, 0x19, /* P-521 */ | |
1756 | ||
1757 | 0x00, 0x0b, /* ec_point_formats */ | |
1758 | 0x00, 0x02, /* 2 bytes */ | |
1759 | 0x01, /* 1 point format */ | |
1760 | 0x00, /* uncompressed */ | |
06217867 | 1761 | /* The following is only present in TLS 1.2 */ |
0f113f3e MC |
1762 | 0x00, 0x0d, /* signature_algorithms */ |
1763 | 0x00, 0x0c, /* 12 bytes */ | |
1764 | 0x00, 0x0a, /* 10 bytes */ | |
1765 | 0x05, 0x01, /* SHA-384/RSA */ | |
1766 | 0x04, 0x01, /* SHA-256/RSA */ | |
1767 | 0x02, 0x01, /* SHA-1/RSA */ | |
1768 | 0x04, 0x03, /* SHA-256/ECDSA */ | |
1769 | 0x02, 0x03, /* SHA-1/ECDSA */ | |
1770 | }; | |
1771 | ||
06217867 EK |
1772 | /* Length of the common prefix (first two extensions). */ |
1773 | static const size_t kSafariCommonExtensionsLength = 18; | |
1774 | ||
1ab3836b | 1775 | tmppkt = hello->extensions; |
68a16628 MC |
1776 | |
1777 | if (!PACKET_forward(&tmppkt, 2) | |
06217867 EK |
1778 | || !PACKET_get_net_2(&tmppkt, &type) |
1779 | || !PACKET_get_length_prefixed_2(&tmppkt, &sni)) { | |
0f113f3e | 1780 | return; |
06217867 | 1781 | } |
0f113f3e MC |
1782 | |
1783 | if (type != TLSEXT_TYPE_server_name) | |
1784 | return; | |
1785 | ||
06217867 EK |
1786 | ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ? |
1787 | sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength; | |
0f113f3e | 1788 | |
06217867 EK |
1789 | s->s3->is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock, |
1790 | ext_len); | |
dece3209 | 1791 | } |
a230b26e | 1792 | #endif /* !OPENSSL_NO_EC */ |
0f113f3e | 1793 | |
06217867 | 1794 | /* |
64386324 MC |
1795 | * Loop through all remaining ClientHello extensions that we collected earlier |
1796 | * and haven't already processed. For each one parse it and update the SSL | |
1797 | * object as required. | |
06217867 EK |
1798 | * |
1799 | * Behaviour upon resumption is extension-specific. If the extension has no | |
1800 | * effect during resumption, it is parsed (to verify its format) but otherwise | |
1801 | * ignored. | |
1802 | * | |
64386324 | 1803 | * Returns 1 on success and 0 on failure. |
06217867 EK |
1804 | * Upon failure, sets |al| to the appropriate alert. |
1805 | */ | |
1ab3836b | 1806 | static int ssl_scan_clienthello_tlsext(SSL *s, CLIENTHELLO_MSG *hello, int *al) |
0f113f3e | 1807 | { |
1ab3836b | 1808 | size_t loop; |
0f113f3e MC |
1809 | int renegotiate_seen = 0; |
1810 | ||
06217867 | 1811 | *al = SSL_AD_DECODE_ERROR; |
0f113f3e MC |
1812 | s->servername_done = 0; |
1813 | s->tlsext_status_type = -1; | |
e481f9b9 | 1814 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e | 1815 | s->s3->next_proto_neg_seen = 0; |
e481f9b9 | 1816 | #endif |
0f113f3e | 1817 | |
b548a1f1 RS |
1818 | OPENSSL_free(s->s3->alpn_selected); |
1819 | s->s3->alpn_selected = NULL; | |
0351baae TS |
1820 | s->s3->alpn_selected_len = 0; |
1821 | OPENSSL_free(s->s3->alpn_proposed); | |
1822 | s->s3->alpn_proposed = NULL; | |
1823 | s->s3->alpn_proposed_len = 0; | |
e481f9b9 | 1824 | #ifndef OPENSSL_NO_HEARTBEATS |
22e3dcb7 RS |
1825 | s->tlsext_heartbeat &= ~(SSL_DTLSEXT_HB_ENABLED | |
1826 | SSL_DTLSEXT_HB_DONT_SEND_REQUESTS); | |
e481f9b9 | 1827 | #endif |
0f113f3e | 1828 | |
e481f9b9 | 1829 | #ifndef OPENSSL_NO_EC |
0f113f3e | 1830 | if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG) |
1ab3836b | 1831 | ssl_check_for_safari(s, hello); |
a230b26e | 1832 | #endif /* !OPENSSL_NO_EC */ |
0f113f3e MC |
1833 | |
1834 | /* Clear any signature algorithms extension received */ | |
76106e60 DSH |
1835 | OPENSSL_free(s->s3->tmp.peer_sigalgs); |
1836 | s->s3->tmp.peer_sigalgs = NULL; | |
0f113f3e | 1837 | s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC; |
0f113f3e | 1838 | |
e481f9b9 | 1839 | #ifndef OPENSSL_NO_SRP |
b548a1f1 RS |
1840 | OPENSSL_free(s->srp_ctx.login); |
1841 | s->srp_ctx.login = NULL; | |
e481f9b9 | 1842 | #endif |
0f113f3e MC |
1843 | |
1844 | s->srtp_profile = NULL; | |
1845 | ||
06217867 EK |
1846 | /* |
1847 | * We parse all extensions to ensure the ClientHello is well-formed but, | |
1848 | * unless an extension specifies otherwise, we ignore extensions upon | |
1849 | * resumption. | |
1850 | */ | |
1ab3836b | 1851 | for (loop = 0; loop < hello->num_extensions; loop++) { |
b1b4b543 MC |
1852 | RAW_EXTENSION *currext = &hello->pre_proc_exts[loop]; |
1853 | ||
0f113f3e | 1854 | if (s->tlsext_debug_cb) |
b1b4b543 MC |
1855 | s->tlsext_debug_cb(s, 0, currext->type, |
1856 | PACKET_data(&currext->data), | |
1857 | PACKET_remaining(&currext->data), | |
06217867 | 1858 | s->tlsext_debug_arg); |
9ceb2426 | 1859 | |
b1b4b543 | 1860 | if (currext->type == TLSEXT_TYPE_renegotiate) { |
1ab3836b | 1861 | if (!ssl_parse_clienthello_renegotiate_ext(s, |
b1b4b543 | 1862 | &currext->data, al)) |
0f113f3e MC |
1863 | return 0; |
1864 | renegotiate_seen = 1; | |
1865 | } else if (s->version == SSL3_VERSION) { | |
1866 | } | |
1d97c843 TH |
1867 | /*- |
1868 | * The servername extension is treated as follows: | |
1869 | * | |
1870 | * - Only the hostname type is supported with a maximum length of 255. | |
1871 | * - The servername is rejected if too long or if it contains zeros, | |
1872 | * in which case an fatal alert is generated. | |
1873 | * - The servername field is maintained together with the session cache. | |
1874 | * - When a session is resumed, the servername call back invoked in order | |
0f113f3e MC |
1875 | * to allow the application to position itself to the right context. |
1876 | * - The servername is acknowledged if it is new for a session or when | |
1877 | * it is identical to a previously used for the same session. | |
1d97c843 TH |
1878 | * Applications can control the behaviour. They can at any time |
1879 | * set a 'desirable' servername for a new SSL object. This can be the | |
1880 | * case for example with HTTPS when a Host: header field is received and | |
1881 | * a renegotiation is requested. In this case, a possible servername | |
1882 | * presented in the new client hello is only acknowledged if it matches | |
0f113f3e | 1883 | * the value of the Host: field. |
1d97c843 | 1884 | * - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION |
0f113f3e MC |
1885 | * if they provide for changing an explicit servername context for the |
1886 | * session, i.e. when the session has been established with a servername | |
1887 | * extension. | |
1888 | * - On session reconnect, the servername extension may be absent. | |
1d97c843 | 1889 | * |
0f113f3e | 1890 | */ |
ed3883d2 | 1891 | |
b1b4b543 | 1892 | else if (currext->type == TLSEXT_TYPE_server_name) { |
9ceb2426 | 1893 | unsigned int servname_type; |
06217867 EK |
1894 | PACKET sni, hostname; |
1895 | ||
b1b4b543 | 1896 | if (!PACKET_as_length_prefixed_2(&currext->data, &sni) |
06217867 EK |
1897 | /* ServerNameList must be at least 1 byte long. */ |
1898 | || PACKET_remaining(&sni) == 0) { | |
1899 | return 0; | |
0f113f3e | 1900 | } |
6f017a8f | 1901 | |
06217867 EK |
1902 | /* |
1903 | * Although the server_name extension was intended to be | |
1904 | * extensible to new name types, RFC 4366 defined the | |
8483a003 | 1905 | * syntax inextensibility and OpenSSL 1.0.x parses it as |
06217867 EK |
1906 | * such. |
1907 | * RFC 6066 corrected the mistake but adding new name types | |
1908 | * is nevertheless no longer feasible, so act as if no other | |
1909 | * SNI types can exist, to simplify parsing. | |
1910 | * | |
1911 | * Also note that the RFC permits only one SNI value per type, | |
1912 | * i.e., we can only have a single hostname. | |
1913 | */ | |
1914 | if (!PACKET_get_1(&sni, &servname_type) | |
1915 | || servname_type != TLSEXT_NAMETYPE_host_name | |
1916 | || !PACKET_as_length_prefixed_2(&sni, &hostname)) { | |
1917 | return 0; | |
1918 | } | |
1919 | ||
1920 | if (!s->hit) { | |
1921 | if (PACKET_remaining(&hostname) > TLSEXT_MAXLEN_host_name) { | |
1922 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
1923 | return 0; | |
1924 | } | |
1925 | ||
1926 | if (PACKET_contains_zero_byte(&hostname)) { | |
1927 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
1928 | return 0; | |
1929 | } | |
1930 | ||
1931 | if (!PACKET_strndup(&hostname, &s->session->tlsext_hostname)) { | |
1932 | *al = TLS1_AD_INTERNAL_ERROR; | |
1933 | return 0; | |
1934 | } | |
1935 | ||
1936 | s->servername_done = 1; | |
1937 | } else { | |
1938 | /* | |
1939 | * TODO(openssl-team): if the SNI doesn't match, we MUST | |
1940 | * fall back to a full handshake. | |
1941 | */ | |
1942 | s->servername_done = s->session->tlsext_hostname | |
1943 | && PACKET_equal(&hostname, s->session->tlsext_hostname, | |
1944 | strlen(s->session->tlsext_hostname)); | |
1945 | } | |
0f113f3e | 1946 | } |
e481f9b9 | 1947 | #ifndef OPENSSL_NO_SRP |
b1b4b543 | 1948 | else if (currext->type == TLSEXT_TYPE_srp) { |
06217867 EK |
1949 | PACKET srp_I; |
1950 | ||
b1b4b543 | 1951 | if (!PACKET_as_length_prefixed_1(&currext->data, &srp_I)) |
06217867 EK |
1952 | return 0; |
1953 | ||
1954 | if (PACKET_contains_zero_byte(&srp_I)) | |
1955 | return 0; | |
1956 | ||
1957 | /* | |
1958 | * TODO(openssl-team): currently, we re-authenticate the user | |
1959 | * upon resumption. Instead, we MUST ignore the login. | |
1960 | */ | |
1961 | if (!PACKET_strndup(&srp_I, &s->srp_ctx.login)) { | |
1962 | *al = TLS1_AD_INTERNAL_ERROR; | |
1963 | return 0; | |
1964 | } | |
0f113f3e | 1965 | } |
e481f9b9 | 1966 | #endif |
0f113f3e | 1967 | |
e481f9b9 | 1968 | #ifndef OPENSSL_NO_EC |
b1b4b543 | 1969 | else if (currext->type == TLSEXT_TYPE_ec_point_formats) { |
06217867 | 1970 | PACKET ec_point_format_list; |
0f113f3e | 1971 | |
b1b4b543 | 1972 | if (!PACKET_as_length_prefixed_1(&currext->data, |
1ab3836b | 1973 | &ec_point_format_list) |
06217867 EK |
1974 | || PACKET_remaining(&ec_point_format_list) == 0) { |
1975 | return 0; | |
1976 | } | |
9ceb2426 | 1977 | |
0f113f3e | 1978 | if (!s->hit) { |
06217867 EK |
1979 | if (!PACKET_memdup(&ec_point_format_list, |
1980 | &s->session->tlsext_ecpointformatlist, | |
a230b26e EK |
1981 | &s-> |
1982 | session->tlsext_ecpointformatlist_length)) { | |
0f113f3e MC |
1983 | *al = TLS1_AD_INTERNAL_ERROR; |
1984 | return 0; | |
1985 | } | |
0f113f3e | 1986 | } |
de4d764e MC |
1987 | } else if (currext->type == TLSEXT_TYPE_supported_groups) { |
1988 | PACKET supported_groups_list; | |
0f113f3e | 1989 | |
de4d764e | 1990 | /* Each group is 2 bytes and we must have at least 1. */ |
b1b4b543 | 1991 | if (!PACKET_as_length_prefixed_2(&currext->data, |
de4d764e MC |
1992 | &supported_groups_list) |
1993 | || PACKET_remaining(&supported_groups_list) == 0 | |
1994 | || (PACKET_remaining(&supported_groups_list) % 2) != 0) { | |
06217867 EK |
1995 | return 0; |
1996 | } | |
54e3ad00 | 1997 | |
0f113f3e | 1998 | if (!s->hit) { |
de4d764e MC |
1999 | if (!PACKET_memdup(&supported_groups_list, |
2000 | &s->session->tlsext_supportedgroupslist, | |
a230b26e | 2001 | &s-> |
de4d764e | 2002 | session->tlsext_supportedgroupslist_length)) { |
0f113f3e MC |
2003 | *al = TLS1_AD_INTERNAL_ERROR; |
2004 | return 0; | |
2005 | } | |
0f113f3e | 2006 | } |
0f113f3e | 2007 | } |
a230b26e | 2008 | #endif /* OPENSSL_NO_EC */ |
b1b4b543 | 2009 | else if (currext->type == TLSEXT_TYPE_session_ticket) { |
06217867 | 2010 | if (s->tls_session_ticket_ext_cb && |
1ab3836b | 2011 | !s->tls_session_ticket_ext_cb(s, |
b1b4b543 MC |
2012 | PACKET_data(&currext->data), |
2013 | PACKET_remaining(&currext->data), | |
1ab3836b | 2014 | s->tls_session_ticket_ext_cb_arg)) { |
0f113f3e MC |
2015 | *al = TLS1_AD_INTERNAL_ERROR; |
2016 | return 0; | |
2017 | } | |
b1b4b543 | 2018 | } else if (currext->type == TLSEXT_TYPE_signature_algorithms) { |
06217867 EK |
2019 | PACKET supported_sig_algs; |
2020 | ||
b1b4b543 | 2021 | if (!PACKET_as_length_prefixed_2(&currext->data, |
1ab3836b | 2022 | &supported_sig_algs) |
06217867 EK |
2023 | || (PACKET_remaining(&supported_sig_algs) % 2) != 0 |
2024 | || PACKET_remaining(&supported_sig_algs) == 0) { | |
2025 | return 0; | |
2026 | } | |
2027 | ||
a230b26e | 2028 | if (!s->hit) { |
06217867 EK |
2029 | if (!tls1_save_sigalgs(s, PACKET_data(&supported_sig_algs), |
2030 | PACKET_remaining(&supported_sig_algs))) { | |
2031 | return 0; | |
2032 | } | |
9ceb2426 | 2033 | } |
b1b4b543 MC |
2034 | } else if (currext->type == TLSEXT_TYPE_status_request) { |
2035 | if (!PACKET_get_1(&currext->data, | |
06217867 EK |
2036 | (unsigned int *)&s->tlsext_status_type)) { |
2037 | return 0; | |
2038 | } | |
3e41ac35 | 2039 | #ifndef OPENSSL_NO_OCSP |
0f113f3e | 2040 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) { |
3e41ac35 | 2041 | const unsigned char *ext_data; |
06217867 | 2042 | PACKET responder_id_list, exts; |
a230b26e | 2043 | if (!PACKET_get_length_prefixed_2 |
b1b4b543 | 2044 | (&currext->data, &responder_id_list)) |
06217867 EK |
2045 | return 0; |
2046 | ||
e408c09b MC |
2047 | /* |
2048 | * We remove any OCSP_RESPIDs from a previous handshake | |
2049 | * to prevent unbounded memory growth - CVE-2016-6304 | |
2050 | */ | |
2051 | sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids, | |
2052 | OCSP_RESPID_free); | |
2053 | if (PACKET_remaining(&responder_id_list) > 0) { | |
2054 | s->tlsext_ocsp_ids = sk_OCSP_RESPID_new_null(); | |
2055 | if (s->tlsext_ocsp_ids == NULL) { | |
2056 | *al = SSL_AD_INTERNAL_ERROR; | |
2057 | return 0; | |
2058 | } | |
2059 | } else { | |
2060 | s->tlsext_ocsp_ids = NULL; | |
2061 | } | |
2062 | ||
06217867 | 2063 | while (PACKET_remaining(&responder_id_list) > 0) { |
0f113f3e | 2064 | OCSP_RESPID *id; |
06217867 EK |
2065 | PACKET responder_id; |
2066 | const unsigned char *id_data; | |
9ceb2426 | 2067 | |
06217867 EK |
2068 | if (!PACKET_get_length_prefixed_2(&responder_id_list, |
2069 | &responder_id) | |
2070 | || PACKET_remaining(&responder_id) == 0) { | |
2071 | return 0; | |
9ceb2426 | 2072 | } |
06217867 | 2073 | |
06217867 | 2074 | id_data = PACKET_data(&responder_id); |
348240c6 | 2075 | /* TODO(size_t): Convert d2i_* to size_t */ |
06217867 | 2076 | id = d2i_OCSP_RESPID(NULL, &id_data, |
348240c6 | 2077 | (int)PACKET_remaining(&responder_id)); |
06217867 EK |
2078 | if (id == NULL) |
2079 | return 0; | |
2080 | ||
2081 | if (id_data != PACKET_end(&responder_id)) { | |
0f113f3e | 2082 | OCSP_RESPID_free(id); |
0f113f3e MC |
2083 | return 0; |
2084 | } | |
06217867 | 2085 | |
0f113f3e MC |
2086 | if (!sk_OCSP_RESPID_push(s->tlsext_ocsp_ids, id)) { |
2087 | OCSP_RESPID_free(id); | |
2088 | *al = SSL_AD_INTERNAL_ERROR; | |
2089 | return 0; | |
2090 | } | |
2091 | } | |
4817504d | 2092 | |
0f113f3e | 2093 | /* Read in request_extensions */ |
1ab3836b | 2094 | if (!PACKET_as_length_prefixed_2( |
b1b4b543 | 2095 | &currext->data, &exts)) |
06217867 EK |
2096 | return 0; |
2097 | ||
2098 | if (PACKET_remaining(&exts) > 0) { | |
2099 | ext_data = PACKET_data(&exts); | |
222561fe RS |
2100 | sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts, |
2101 | X509_EXTENSION_free); | |
0f113f3e | 2102 | s->tlsext_ocsp_exts = |
06217867 | 2103 | d2i_X509_EXTENSIONS(NULL, &ext_data, |
348240c6 | 2104 | (int)PACKET_remaining(&exts)); |
06217867 EK |
2105 | if (s->tlsext_ocsp_exts == NULL |
2106 | || ext_data != PACKET_end(&exts)) { | |
2107 | return 0; | |
2108 | } | |
0f113f3e | 2109 | } |
3e41ac35 MC |
2110 | } else |
2111 | #endif | |
2112 | { | |
2113 | /* | |
2114 | * We don't know what to do with any other type so ignore it. | |
2115 | */ | |
0f113f3e | 2116 | s->tlsext_status_type = -1; |
06217867 | 2117 | } |
0f113f3e | 2118 | } |
e481f9b9 | 2119 | #ifndef OPENSSL_NO_HEARTBEATS |
b1b4b543 | 2120 | else if (SSL_IS_DTLS(s) && currext->type == TLSEXT_TYPE_heartbeat) { |
9ceb2426 MC |
2121 | unsigned int hbtype; |
2122 | ||
b1b4b543 MC |
2123 | if (!PACKET_get_1(&currext->data, &hbtype) |
2124 | || PACKET_remaining(&currext->data)) { | |
9ceb2426 MC |
2125 | *al = SSL_AD_DECODE_ERROR; |
2126 | return 0; | |
2127 | } | |
2128 | switch (hbtype) { | |
0f113f3e | 2129 | case 0x01: /* Client allows us to send HB requests */ |
22e3dcb7 | 2130 | s->tlsext_heartbeat |= SSL_DTLSEXT_HB_ENABLED; |
0f113f3e MC |
2131 | break; |
2132 | case 0x02: /* Client doesn't accept HB requests */ | |
22e3dcb7 RS |
2133 | s->tlsext_heartbeat |= SSL_DTLSEXT_HB_ENABLED; |
2134 | s->tlsext_heartbeat |= SSL_DTLSEXT_HB_DONT_SEND_REQUESTS; | |
0f113f3e MC |
2135 | break; |
2136 | default: | |
2137 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
2138 | return 0; | |
2139 | } | |
2140 | } | |
e481f9b9 MC |
2141 | #endif |
2142 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
b1b4b543 | 2143 | else if (currext->type == TLSEXT_TYPE_next_proto_neg |
1ab3836b | 2144 | && s->s3->tmp.finish_md_len == 0) { |
50e735f9 MC |
2145 | /*- |
2146 | * We shouldn't accept this extension on a | |
2147 | * renegotiation. | |
2148 | * | |
2149 | * s->new_session will be set on renegotiation, but we | |
2150 | * probably shouldn't rely that it couldn't be set on | |
8483a003 | 2151 | * the initial renegotiation too in certain cases (when |
50e735f9 MC |
2152 | * there's some other reason to disallow resuming an |
2153 | * earlier session -- the current code won't be doing | |
2154 | * anything like that, but this might change). | |
2155 | * | |
2156 | * A valid sign that there's been a previous handshake | |
2157 | * in this connection is if s->s3->tmp.finish_md_len > | |
2158 | * 0. (We are talking about a check that will happen | |
2159 | * in the Hello protocol round, well before a new | |
2160 | * Finished message could have been computed.) | |
2161 | */ | |
0f113f3e MC |
2162 | s->s3->next_proto_neg_seen = 1; |
2163 | } | |
e481f9b9 | 2164 | #endif |
0f113f3e | 2165 | |
b1b4b543 | 2166 | else if (currext->type |
1ab3836b MC |
2167 | == TLSEXT_TYPE_application_layer_protocol_negotiation |
2168 | && s->s3->tmp.finish_md_len == 0) { | |
2169 | if (!tls1_alpn_handle_client_hello(s, | |
b1b4b543 | 2170 | &currext->data, al)) |
0f113f3e | 2171 | return 0; |
0f113f3e | 2172 | } |
5e3ff62c | 2173 | |
0f113f3e | 2174 | /* session ticket processed earlier */ |
e481f9b9 | 2175 | #ifndef OPENSSL_NO_SRTP |
0f113f3e | 2176 | else if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s) |
b1b4b543 | 2177 | && currext->type == TLSEXT_TYPE_use_srtp) { |
1ab3836b | 2178 | if (ssl_parse_clienthello_use_srtp_ext(s, |
b1b4b543 | 2179 | &currext->data, al)) |
0f113f3e MC |
2180 | return 0; |
2181 | } | |
e481f9b9 | 2182 | #endif |
b1b4b543 | 2183 | else if (currext->type == TLSEXT_TYPE_encrypt_then_mac |
1ab3836b | 2184 | && !(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)) |
0f113f3e | 2185 | s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC; |
e7f0d921 DSH |
2186 | /* |
2187 | * Note: extended master secret extension handled in | |
1ab3836b | 2188 | * tls_check_client_ems_support() |
e7f0d921 DSH |
2189 | */ |
2190 | ||
0f113f3e MC |
2191 | /* |
2192 | * If this ClientHello extension was unhandled and this is a | |
2193 | * nonresumed connection, check whether the extension is a custom | |
2194 | * TLS Extension (has a custom_srv_ext_record), and if so call the | |
2195 | * callback and record the extension number so that an appropriate | |
2196 | * ServerHello may be later returned. | |
2197 | */ | |
2198 | else if (!s->hit) { | |
b1b4b543 MC |
2199 | if (custom_ext_parse(s, 1, currext->type, |
2200 | PACKET_data(&currext->data), | |
2201 | PACKET_remaining(&currext->data), al) <= 0) | |
0f113f3e MC |
2202 | return 0; |
2203 | } | |
0f113f3e | 2204 | } |
6f017a8f | 2205 | |
0f113f3e MC |
2206 | /* Need RI if renegotiating */ |
2207 | ||
2208 | if (!renegotiate_seen && s->renegotiate && | |
2209 | !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) { | |
2210 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
2211 | SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, | |
2212 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); | |
2213 | return 0; | |
2214 | } | |
2215 | ||
06217867 EK |
2216 | /* |
2217 | * This function currently has no state to clean up, so it returns directly. | |
2218 | * If parsing fails at any point, the function returns early. | |
2219 | * The SSL object may be left with partial data from extensions, but it must | |
2220 | * then no longer be used, and clearing it up will free the leftovers. | |
2221 | */ | |
0f113f3e MC |
2222 | return 1; |
2223 | } | |
2224 | ||
1ab3836b | 2225 | int ssl_parse_clienthello_tlsext(SSL *s, CLIENTHELLO_MSG *hello) |
0f113f3e MC |
2226 | { |
2227 | int al = -1; | |
2228 | custom_ext_init(&s->cert->srv_ext); | |
1ab3836b | 2229 | if (ssl_scan_clienthello_tlsext(s, hello, &al) <= 0) { |
0f113f3e MC |
2230 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
2231 | return 0; | |
2232 | } | |
0f113f3e MC |
2233 | if (ssl_check_clienthello_tlsext_early(s) <= 0) { |
2234 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, SSL_R_CLIENTHELLO_TLSEXT); | |
2235 | return 0; | |
2236 | } | |
2237 | return 1; | |
2238 | } | |
2239 | ||
e481f9b9 | 2240 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
2241 | /* |
2242 | * ssl_next_proto_validate validates a Next Protocol Negotiation block. No | |
2243 | * elements of zero length are allowed and the set of elements must exactly | |
2244 | * fill the length of the block. | |
2245 | */ | |
50932c4a | 2246 | static char ssl_next_proto_validate(PACKET *pkt) |
0f113f3e | 2247 | { |
b04f9479 | 2248 | PACKET tmp_protocol; |
0f113f3e | 2249 | |
50932c4a | 2250 | while (PACKET_remaining(pkt)) { |
b04f9479 | 2251 | if (!PACKET_get_length_prefixed_1(pkt, &tmp_protocol) |
a230b26e | 2252 | || PACKET_remaining(&tmp_protocol) == 0) |
0f113f3e | 2253 | return 0; |
0f113f3e MC |
2254 | } |
2255 | ||
50932c4a | 2256 | return 1; |
0f113f3e | 2257 | } |
e481f9b9 | 2258 | #endif |
0f113f3e | 2259 | |
50932c4a | 2260 | static int ssl_scan_serverhello_tlsext(SSL *s, PACKET *pkt, int *al) |
0f113f3e | 2261 | { |
50932c4a | 2262 | unsigned int length, type, size; |
0f113f3e MC |
2263 | int tlsext_servername = 0; |
2264 | int renegotiate_seen = 0; | |
2265 | ||
e481f9b9 | 2266 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e | 2267 | s->s3->next_proto_neg_seen = 0; |
e481f9b9 | 2268 | #endif |
0f113f3e MC |
2269 | s->tlsext_ticket_expected = 0; |
2270 | ||
b548a1f1 RS |
2271 | OPENSSL_free(s->s3->alpn_selected); |
2272 | s->s3->alpn_selected = NULL; | |
e481f9b9 | 2273 | #ifndef OPENSSL_NO_HEARTBEATS |
22e3dcb7 RS |
2274 | s->tlsext_heartbeat &= ~(SSL_DTLSEXT_HB_ENABLED | |
2275 | SSL_DTLSEXT_HB_DONT_SEND_REQUESTS); | |
e481f9b9 | 2276 | #endif |
0f113f3e | 2277 | |
0f113f3e | 2278 | s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC; |
0f113f3e | 2279 | |
e7f0d921 DSH |
2280 | s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS; |
2281 | ||
50932c4a | 2282 | if (!PACKET_get_net_2(pkt, &length)) |
0f113f3e MC |
2283 | goto ri_check; |
2284 | ||
50932c4a | 2285 | if (PACKET_remaining(pkt) != length) { |
0f113f3e MC |
2286 | *al = SSL_AD_DECODE_ERROR; |
2287 | return 0; | |
2288 | } | |
2289 | ||
aa474d1f EK |
2290 | if (!tls1_check_duplicate_extensions(pkt)) { |
2291 | *al = SSL_AD_DECODE_ERROR; | |
2292 | return 0; | |
2293 | } | |
2294 | ||
50932c4a | 2295 | while (PACKET_get_net_2(pkt, &type) && PACKET_get_net_2(pkt, &size)) { |
b6981744 | 2296 | const unsigned char *data; |
50932c4a | 2297 | PACKET spkt; |
0f113f3e | 2298 | |
50932c4a | 2299 | if (!PACKET_get_sub_packet(pkt, &spkt, size) |
a230b26e | 2300 | || !PACKET_peek_bytes(&spkt, &data, size)) |
0f113f3e MC |
2301 | goto ri_check; |
2302 | ||
2303 | if (s->tlsext_debug_cb) | |
2304 | s->tlsext_debug_cb(s, 1, type, data, size, s->tlsext_debug_arg); | |
2305 | ||
2306 | if (type == TLSEXT_TYPE_renegotiate) { | |
50932c4a | 2307 | if (!ssl_parse_serverhello_renegotiate_ext(s, &spkt, al)) |
0f113f3e MC |
2308 | return 0; |
2309 | renegotiate_seen = 1; | |
2310 | } else if (s->version == SSL3_VERSION) { | |
2311 | } else if (type == TLSEXT_TYPE_server_name) { | |
2312 | if (s->tlsext_hostname == NULL || size > 0) { | |
2313 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
2314 | return 0; | |
2315 | } | |
2316 | tlsext_servername = 1; | |
2317 | } | |
e481f9b9 | 2318 | #ifndef OPENSSL_NO_EC |
0f113f3e | 2319 | else if (type == TLSEXT_TYPE_ec_point_formats) { |
50932c4a MC |
2320 | unsigned int ecpointformatlist_length; |
2321 | if (!PACKET_get_1(&spkt, &ecpointformatlist_length) | |
a230b26e | 2322 | || ecpointformatlist_length != size - 1) { |
0f113f3e MC |
2323 | *al = TLS1_AD_DECODE_ERROR; |
2324 | return 0; | |
2325 | } | |
2326 | if (!s->hit) { | |
2327 | s->session->tlsext_ecpointformatlist_length = 0; | |
b548a1f1 | 2328 | OPENSSL_free(s->session->tlsext_ecpointformatlist); |
0f113f3e MC |
2329 | if ((s->session->tlsext_ecpointformatlist = |
2330 | OPENSSL_malloc(ecpointformatlist_length)) == NULL) { | |
2331 | *al = TLS1_AD_INTERNAL_ERROR; | |
2332 | return 0; | |
2333 | } | |
2334 | s->session->tlsext_ecpointformatlist_length = | |
2335 | ecpointformatlist_length; | |
50932c4a MC |
2336 | if (!PACKET_copy_bytes(&spkt, |
2337 | s->session->tlsext_ecpointformatlist, | |
2338 | ecpointformatlist_length)) { | |
2339 | *al = TLS1_AD_DECODE_ERROR; | |
2340 | return 0; | |
2341 | } | |
2342 | ||
0f113f3e | 2343 | } |
0f113f3e | 2344 | } |
a230b26e | 2345 | #endif /* OPENSSL_NO_EC */ |
0f113f3e MC |
2346 | |
2347 | else if (type == TLSEXT_TYPE_session_ticket) { | |
2348 | if (s->tls_session_ticket_ext_cb && | |
2349 | !s->tls_session_ticket_ext_cb(s, data, size, | |
2350 | s->tls_session_ticket_ext_cb_arg)) | |
2351 | { | |
2352 | *al = TLS1_AD_INTERNAL_ERROR; | |
2353 | return 0; | |
2354 | } | |
2355 | if (!tls_use_ticket(s) || (size > 0)) { | |
2356 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
2357 | return 0; | |
2358 | } | |
2359 | s->tlsext_ticket_expected = 1; | |
a230b26e | 2360 | } else if (type == TLSEXT_TYPE_status_request) { |
0f113f3e MC |
2361 | /* |
2362 | * MUST be empty and only sent if we've requested a status | |
2363 | * request message. | |
2364 | */ | |
2365 | if ((s->tlsext_status_type == -1) || (size > 0)) { | |
2366 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
2367 | return 0; | |
2368 | } | |
2369 | /* Set flag to expect CertificateStatus message */ | |
2370 | s->tlsext_status_expected = 1; | |
2371 | } | |
ed29e82a RP |
2372 | #ifndef OPENSSL_NO_CT |
2373 | /* | |
2374 | * Only take it if we asked for it - i.e if there is no CT validation | |
2375 | * callback set, then a custom extension MAY be processing it, so we | |
2376 | * need to let control continue to flow to that. | |
2377 | */ | |
2378 | else if (type == TLSEXT_TYPE_signed_certificate_timestamp && | |
2379 | s->ct_validation_callback != NULL) { | |
2380 | /* Simply copy it off for later processing */ | |
2381 | if (s->tlsext_scts != NULL) { | |
2382 | OPENSSL_free(s->tlsext_scts); | |
2383 | s->tlsext_scts = NULL; | |
2384 | } | |
2385 | s->tlsext_scts_len = size; | |
2386 | if (size > 0) { | |
2387 | s->tlsext_scts = OPENSSL_malloc(size); | |
2388 | if (s->tlsext_scts == NULL) { | |
2389 | *al = TLS1_AD_INTERNAL_ERROR; | |
2390 | return 0; | |
2391 | } | |
2392 | memcpy(s->tlsext_scts, data, size); | |
2393 | } | |
2394 | } | |
2395 | #endif | |
e481f9b9 | 2396 | #ifndef OPENSSL_NO_NEXTPROTONEG |
0f113f3e MC |
2397 | else if (type == TLSEXT_TYPE_next_proto_neg && |
2398 | s->s3->tmp.finish_md_len == 0) { | |
2399 | unsigned char *selected; | |
2400 | unsigned char selected_len; | |
0f113f3e MC |
2401 | /* We must have requested it. */ |
2402 | if (s->ctx->next_proto_select_cb == NULL) { | |
2403 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
2404 | return 0; | |
2405 | } | |
2406 | /* The data must be valid */ | |
50932c4a | 2407 | if (!ssl_next_proto_validate(&spkt)) { |
0f113f3e MC |
2408 | *al = TLS1_AD_DECODE_ERROR; |
2409 | return 0; | |
2410 | } | |
a230b26e EK |
2411 | if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, |
2412 | size, | |
2413 | s-> | |
2414 | ctx->next_proto_select_cb_arg) != | |
0f113f3e MC |
2415 | SSL_TLSEXT_ERR_OK) { |
2416 | *al = TLS1_AD_INTERNAL_ERROR; | |
2417 | return 0; | |
2418 | } | |
c31dbed7 MC |
2419 | /* |
2420 | * Could be non-NULL if server has sent multiple NPN extensions in | |
2421 | * a single Serverhello | |
2422 | */ | |
2423 | OPENSSL_free(s->next_proto_negotiated); | |
0f113f3e | 2424 | s->next_proto_negotiated = OPENSSL_malloc(selected_len); |
a71edf3b | 2425 | if (s->next_proto_negotiated == NULL) { |
0f113f3e MC |
2426 | *al = TLS1_AD_INTERNAL_ERROR; |
2427 | return 0; | |
2428 | } | |
2429 | memcpy(s->next_proto_negotiated, selected, selected_len); | |
2430 | s->next_proto_negotiated_len = selected_len; | |
2431 | s->s3->next_proto_neg_seen = 1; | |
2432 | } | |
e481f9b9 | 2433 | #endif |
0f113f3e MC |
2434 | |
2435 | else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation) { | |
2436 | unsigned len; | |
0f113f3e | 2437 | /* We must have requested it. */ |
817cd0d5 | 2438 | if (!s->s3->alpn_sent) { |
0f113f3e MC |
2439 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; |
2440 | return 0; | |
2441 | } | |
50e735f9 MC |
2442 | /*- |
2443 | * The extension data consists of: | |
2444 | * uint16 list_length | |
2445 | * uint8 proto_length; | |
2446 | * uint8 proto[proto_length]; | |
2447 | */ | |
50932c4a | 2448 | if (!PACKET_get_net_2(&spkt, &len) |
a230b26e EK |
2449 | || PACKET_remaining(&spkt) != len || !PACKET_get_1(&spkt, &len) |
2450 | || PACKET_remaining(&spkt) != len) { | |
0f113f3e MC |
2451 | *al = TLS1_AD_DECODE_ERROR; |
2452 | return 0; | |
2453 | } | |
b548a1f1 | 2454 | OPENSSL_free(s->s3->alpn_selected); |
0f113f3e | 2455 | s->s3->alpn_selected = OPENSSL_malloc(len); |
a71edf3b | 2456 | if (s->s3->alpn_selected == NULL) { |
0f113f3e MC |
2457 | *al = TLS1_AD_INTERNAL_ERROR; |
2458 | return 0; | |
2459 | } | |
50932c4a MC |
2460 | if (!PACKET_copy_bytes(&spkt, s->s3->alpn_selected, len)) { |
2461 | *al = TLS1_AD_DECODE_ERROR; | |
2462 | return 0; | |
2463 | } | |
0f113f3e MC |
2464 | s->s3->alpn_selected_len = len; |
2465 | } | |
e481f9b9 | 2466 | #ifndef OPENSSL_NO_HEARTBEATS |
22e3dcb7 | 2467 | else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_heartbeat) { |
50932c4a MC |
2468 | unsigned int hbtype; |
2469 | if (!PACKET_get_1(&spkt, &hbtype)) { | |
2470 | *al = SSL_AD_DECODE_ERROR; | |
2471 | return 0; | |
2472 | } | |
2473 | switch (hbtype) { | |
0f113f3e | 2474 | case 0x01: /* Server allows us to send HB requests */ |
22e3dcb7 | 2475 | s->tlsext_heartbeat |= SSL_DTLSEXT_HB_ENABLED; |
0f113f3e MC |
2476 | break; |
2477 | case 0x02: /* Server doesn't accept HB requests */ | |
22e3dcb7 RS |
2478 | s->tlsext_heartbeat |= SSL_DTLSEXT_HB_ENABLED; |
2479 | s->tlsext_heartbeat |= SSL_DTLSEXT_HB_DONT_SEND_REQUESTS; | |
0f113f3e MC |
2480 | break; |
2481 | default: | |
2482 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
2483 | return 0; | |
2484 | } | |
2485 | } | |
e481f9b9 MC |
2486 | #endif |
2487 | #ifndef OPENSSL_NO_SRTP | |
0f113f3e | 2488 | else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_use_srtp) { |
50932c4a | 2489 | if (ssl_parse_serverhello_use_srtp_ext(s, &spkt, al)) |
0f113f3e MC |
2490 | return 0; |
2491 | } | |
e481f9b9 | 2492 | #endif |
0f113f3e MC |
2493 | else if (type == TLSEXT_TYPE_encrypt_then_mac) { |
2494 | /* Ignore if inappropriate ciphersuite */ | |
cde6145b DW |
2495 | if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC) && |
2496 | s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD | |
0f113f3e MC |
2497 | && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4) |
2498 | s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC; | |
a230b26e | 2499 | } else if (type == TLSEXT_TYPE_extended_master_secret) { |
e7f0d921 | 2500 | s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS; |
ddc06b35 DSH |
2501 | if (!s->hit) |
2502 | s->session->flags |= SSL_SESS_FLAG_EXTMS; | |
2503 | } | |
0f113f3e MC |
2504 | /* |
2505 | * If this extension type was not otherwise handled, but matches a | |
2506 | * custom_cli_ext_record, then send it to the c callback | |
2507 | */ | |
2508 | else if (custom_ext_parse(s, 0, type, data, size, al) <= 0) | |
2509 | return 0; | |
0f113f3e MC |
2510 | } |
2511 | ||
50932c4a | 2512 | if (PACKET_remaining(pkt) != 0) { |
0f113f3e MC |
2513 | *al = SSL_AD_DECODE_ERROR; |
2514 | return 0; | |
2515 | } | |
2516 | ||
2517 | if (!s->hit && tlsext_servername == 1) { | |
2518 | if (s->tlsext_hostname) { | |
2519 | if (s->session->tlsext_hostname == NULL) { | |
a230b26e EK |
2520 | s->session->tlsext_hostname = |
2521 | OPENSSL_strdup(s->tlsext_hostname); | |
0f113f3e MC |
2522 | if (!s->session->tlsext_hostname) { |
2523 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
2524 | return 0; | |
2525 | } | |
2526 | } else { | |
2527 | *al = SSL_AD_DECODE_ERROR; | |
2528 | return 0; | |
2529 | } | |
2530 | } | |
2531 | } | |
2532 | ||
0f113f3e MC |
2533 | ri_check: |
2534 | ||
2535 | /* | |
2536 | * Determine if we need to see RI. Strictly speaking if we want to avoid | |
2537 | * an attack we should *always* see RI even on initial server hello | |
2538 | * because the client doesn't see any renegotiation during an attack. | |
2539 | * However this would mean we could not connect to any server which | |
e7653f3b | 2540 | * doesn't support RI so for the immediate future tolerate RI absence |
0f113f3e MC |
2541 | */ |
2542 | if (!renegotiate_seen && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
2543 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) { | |
2544 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
2545 | SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT, | |
2546 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); | |
2547 | return 0; | |
2548 | } | |
2549 | ||
e7f0d921 DSH |
2550 | if (s->hit) { |
2551 | /* | |
2552 | * Check extended master secret extension is consistent with | |
2553 | * original session. | |
2554 | */ | |
2555 | if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) != | |
2556 | !(s->session->flags & SSL_SESS_FLAG_EXTMS)) { | |
2557 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
2558 | SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT, SSL_R_INCONSISTENT_EXTMS); | |
2559 | return 0; | |
a230b26e | 2560 | } |
e7f0d921 DSH |
2561 | } |
2562 | ||
0f113f3e MC |
2563 | return 1; |
2564 | } | |
b2172f4f | 2565 | |
36ca4ba6 | 2566 | int ssl_prepare_clienthello_tlsext(SSL *s) |
0f113f3e | 2567 | { |
817cd0d5 | 2568 | s->s3->alpn_sent = 0; |
0f113f3e MC |
2569 | return 1; |
2570 | } | |
36ca4ba6 BM |
2571 | |
2572 | int ssl_prepare_serverhello_tlsext(SSL *s) | |
0f113f3e MC |
2573 | { |
2574 | return 1; | |
2575 | } | |
36ca4ba6 | 2576 | |
2daceb03 | 2577 | static int ssl_check_clienthello_tlsext_early(SSL *s) |
0f113f3e MC |
2578 | { |
2579 | int ret = SSL_TLSEXT_ERR_NOACK; | |
2580 | int al = SSL_AD_UNRECOGNIZED_NAME; | |
2581 | ||
e481f9b9 | 2582 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
2583 | /* |
2584 | * The handling of the ECPointFormats extension is done elsewhere, namely | |
2585 | * in ssl3_choose_cipher in s3_lib.c. | |
2586 | */ | |
2587 | /* | |
2588 | * The handling of the EllipticCurves extension is done elsewhere, namely | |
2589 | * in ssl3_choose_cipher in s3_lib.c. | |
2590 | */ | |
e481f9b9 | 2591 | #endif |
0f113f3e MC |
2592 | |
2593 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) | |
2594 | ret = | |
2595 | s->ctx->tlsext_servername_callback(s, &al, | |
2596 | s->ctx->tlsext_servername_arg); | |
2597 | else if (s->initial_ctx != NULL | |
2598 | && s->initial_ctx->tlsext_servername_callback != 0) | |
2599 | ret = | |
2600 | s->initial_ctx->tlsext_servername_callback(s, &al, | |
2601 | s-> | |
2602 | initial_ctx->tlsext_servername_arg); | |
2603 | ||
0f113f3e MC |
2604 | switch (ret) { |
2605 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
2606 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
2607 | return -1; | |
2608 | ||
2609 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
2610 | ssl3_send_alert(s, SSL3_AL_WARNING, al); | |
2611 | return 1; | |
2612 | ||
2613 | case SSL_TLSEXT_ERR_NOACK: | |
2614 | s->servername_done = 0; | |
2615 | default: | |
2616 | return 1; | |
2617 | } | |
2618 | } | |
a230b26e | 2619 | |
d376e57d | 2620 | /* Initialise digests to default values */ |
a0f63828 | 2621 | void ssl_set_default_md(SSL *s) |
d376e57d DSH |
2622 | { |
2623 | const EVP_MD **pmd = s->s3->tmp.md; | |
2624 | #ifndef OPENSSL_NO_DSA | |
152fbc28 | 2625 | pmd[SSL_PKEY_DSA_SIGN] = ssl_md(SSL_MD_SHA1_IDX); |
d376e57d DSH |
2626 | #endif |
2627 | #ifndef OPENSSL_NO_RSA | |
d18d31a1 | 2628 | if (SSL_USE_SIGALGS(s)) |
152fbc28 | 2629 | pmd[SSL_PKEY_RSA_SIGN] = ssl_md(SSL_MD_SHA1_IDX); |
d18d31a1 | 2630 | else |
152fbc28 | 2631 | pmd[SSL_PKEY_RSA_SIGN] = ssl_md(SSL_MD_MD5_SHA1_IDX); |
d18d31a1 | 2632 | pmd[SSL_PKEY_RSA_ENC] = pmd[SSL_PKEY_RSA_SIGN]; |
d376e57d DSH |
2633 | #endif |
2634 | #ifndef OPENSSL_NO_EC | |
152fbc28 | 2635 | pmd[SSL_PKEY_ECC] = ssl_md(SSL_MD_SHA1_IDX); |
d376e57d | 2636 | #endif |
e44380a9 | 2637 | #ifndef OPENSSL_NO_GOST |
152fbc28 DSH |
2638 | pmd[SSL_PKEY_GOST01] = ssl_md(SSL_MD_GOST94_IDX); |
2639 | pmd[SSL_PKEY_GOST12_256] = ssl_md(SSL_MD_GOST12_256_IDX); | |
2640 | pmd[SSL_PKEY_GOST12_512] = ssl_md(SSL_MD_GOST12_512_IDX); | |
e44380a9 | 2641 | #endif |
d376e57d | 2642 | } |
f1fd4544 | 2643 | |
e469af8d | 2644 | int tls1_set_server_sigalgs(SSL *s) |
0f113f3e MC |
2645 | { |
2646 | int al; | |
2647 | size_t i; | |
8483a003 F |
2648 | |
2649 | /* Clear any shared signature algorithms */ | |
b548a1f1 RS |
2650 | OPENSSL_free(s->cert->shared_sigalgs); |
2651 | s->cert->shared_sigalgs = NULL; | |
2652 | s->cert->shared_sigalgslen = 0; | |
0f113f3e MC |
2653 | /* Clear certificate digests and validity flags */ |
2654 | for (i = 0; i < SSL_PKEY_NUM; i++) { | |
d376e57d | 2655 | s->s3->tmp.md[i] = NULL; |
6383d316 | 2656 | s->s3->tmp.valid_flags[i] = 0; |
0f113f3e MC |
2657 | } |
2658 | ||
2659 | /* If sigalgs received process it. */ | |
76106e60 | 2660 | if (s->s3->tmp.peer_sigalgs) { |
0f113f3e MC |
2661 | if (!tls1_process_sigalgs(s)) { |
2662 | SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS, ERR_R_MALLOC_FAILURE); | |
2663 | al = SSL_AD_INTERNAL_ERROR; | |
2664 | goto err; | |
2665 | } | |
2666 | /* Fatal error is no shared signature algorithms */ | |
2667 | if (!s->cert->shared_sigalgs) { | |
2668 | SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS, | |
f430ba31 | 2669 | SSL_R_NO_SHARED_SIGNATURE_ALGORITHMS); |
0f113f3e MC |
2670 | al = SSL_AD_ILLEGAL_PARAMETER; |
2671 | goto err; | |
2672 | } | |
d376e57d DSH |
2673 | } else { |
2674 | ssl_set_default_md(s); | |
2675 | } | |
0f113f3e MC |
2676 | return 1; |
2677 | err: | |
2678 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
2679 | return 0; | |
2680 | } | |
e469af8d | 2681 | |
70c22888 EK |
2682 | /* |
2683 | * Upon success, returns 1. | |
2684 | * Upon failure, returns 0 and sets |al| to the appropriate fatal alert. | |
2685 | */ | |
2686 | int ssl_check_clienthello_tlsext_late(SSL *s, int *al) | |
0f113f3e | 2687 | { |
70c22888 | 2688 | s->tlsext_status_expected = 0; |
0f113f3e MC |
2689 | |
2690 | /* | |
2691 | * If status request then ask callback what to do. Note: this must be | |
2692 | * called after servername callbacks in case the certificate has changed, | |
2693 | * and must be called after the cipher has been chosen because this may | |
2694 | * influence which certificate is sent | |
2695 | */ | |
2696 | if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) { | |
70c22888 | 2697 | int ret; |
0f113f3e MC |
2698 | CERT_PKEY *certpkey; |
2699 | certpkey = ssl_get_server_send_pkey(s); | |
2700 | /* If no certificate can't return certificate status */ | |
70c22888 EK |
2701 | if (certpkey != NULL) { |
2702 | /* | |
2703 | * Set current certificate to one we will use so SSL_get_certificate | |
2704 | * et al can pick it up. | |
2705 | */ | |
2706 | s->cert->key = certpkey; | |
2707 | ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); | |
2708 | switch (ret) { | |
2709 | /* We don't want to send a status request response */ | |
2710 | case SSL_TLSEXT_ERR_NOACK: | |
0f113f3e | 2711 | s->tlsext_status_expected = 0; |
70c22888 EK |
2712 | break; |
2713 | /* status request response should be sent */ | |
2714 | case SSL_TLSEXT_ERR_OK: | |
2715 | if (s->tlsext_ocsp_resp) | |
2716 | s->tlsext_status_expected = 1; | |
2717 | break; | |
2718 | /* something bad happened */ | |
2719 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
2720 | default: | |
2721 | *al = SSL_AD_INTERNAL_ERROR; | |
2722 | return 0; | |
2723 | } | |
0f113f3e | 2724 | } |
817cd0d5 TS |
2725 | } |
2726 | ||
70c22888 EK |
2727 | if (!tls1_alpn_handle_client_hello_late(s, al)) { |
2728 | return 0; | |
0f113f3e | 2729 | } |
70c22888 EK |
2730 | |
2731 | return 1; | |
0f113f3e | 2732 | } |
2daceb03 | 2733 | |
36ca4ba6 | 2734 | int ssl_check_serverhello_tlsext(SSL *s) |
0f113f3e MC |
2735 | { |
2736 | int ret = SSL_TLSEXT_ERR_NOACK; | |
2737 | int al = SSL_AD_UNRECOGNIZED_NAME; | |
2738 | ||
e481f9b9 | 2739 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
2740 | /* |
2741 | * If we are client and using an elliptic curve cryptography cipher | |
2742 | * suite, then if server returns an EC point formats lists extension it | |
2743 | * must contain uncompressed. | |
2744 | */ | |
2745 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
2746 | unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
2747 | if ((s->tlsext_ecpointformatlist != NULL) | |
2748 | && (s->tlsext_ecpointformatlist_length > 0) | |
2749 | && (s->session->tlsext_ecpointformatlist != NULL) | |
2750 | && (s->session->tlsext_ecpointformatlist_length > 0) | |
ce0c1f2b | 2751 | && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) { |
0f113f3e MC |
2752 | /* we are using an ECC cipher */ |
2753 | size_t i; | |
2754 | unsigned char *list; | |
2755 | int found_uncompressed = 0; | |
2756 | list = s->session->tlsext_ecpointformatlist; | |
2757 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) { | |
2758 | if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) { | |
2759 | found_uncompressed = 1; | |
2760 | break; | |
2761 | } | |
2762 | } | |
2763 | if (!found_uncompressed) { | |
2764 | SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT, | |
2765 | SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); | |
2766 | return -1; | |
2767 | } | |
2768 | } | |
2769 | ret = SSL_TLSEXT_ERR_OK; | |
a230b26e | 2770 | #endif /* OPENSSL_NO_EC */ |
0f113f3e MC |
2771 | |
2772 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) | |
2773 | ret = | |
2774 | s->ctx->tlsext_servername_callback(s, &al, | |
2775 | s->ctx->tlsext_servername_arg); | |
2776 | else if (s->initial_ctx != NULL | |
2777 | && s->initial_ctx->tlsext_servername_callback != 0) | |
2778 | ret = | |
2779 | s->initial_ctx->tlsext_servername_callback(s, &al, | |
2780 | s-> | |
2781 | initial_ctx->tlsext_servername_arg); | |
2782 | ||
b1931d43 MC |
2783 | /* |
2784 | * Ensure we get sensible values passed to tlsext_status_cb in the event | |
2785 | * that we don't receive a status message | |
2786 | */ | |
bb1aaab4 MC |
2787 | OPENSSL_free(s->tlsext_ocsp_resp); |
2788 | s->tlsext_ocsp_resp = NULL; | |
8b0e934a | 2789 | s->tlsext_ocsp_resplen = 0; |
0f113f3e MC |
2790 | |
2791 | switch (ret) { | |
2792 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
2793 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
2794 | return -1; | |
2795 | ||
2796 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
2797 | ssl3_send_alert(s, SSL3_AL_WARNING, al); | |
2798 | return 1; | |
2799 | ||
2800 | case SSL_TLSEXT_ERR_NOACK: | |
2801 | s->servername_done = 0; | |
2802 | default: | |
2803 | return 1; | |
2804 | } | |
2805 | } | |
761772d7 | 2806 | |
50932c4a | 2807 | int ssl_parse_serverhello_tlsext(SSL *s, PACKET *pkt) |
0f113f3e MC |
2808 | { |
2809 | int al = -1; | |
2810 | if (s->version < SSL3_VERSION) | |
2811 | return 1; | |
50932c4a | 2812 | if (ssl_scan_serverhello_tlsext(s, pkt, &al) <= 0) { |
0f113f3e MC |
2813 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
2814 | return 0; | |
2815 | } | |
2816 | ||
2817 | if (ssl_check_serverhello_tlsext(s) <= 0) { | |
2818 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, SSL_R_SERVERHELLO_TLSEXT); | |
2819 | return 0; | |
2820 | } | |
2821 | return 1; | |
09e4e4b9 DSH |
2822 | } |
2823 | ||
64386324 MC |
2824 | /* |
2825 | * Given a list of extensions that we collected earlier, find one of a given | |
2826 | * type and return it. | |
2827 | * | |
2828 | * |exts| is the set of extensions previously collected. | |
2829 | * |numexts| is the number of extensions that we have. | |
2830 | * |type| the type of the extension that we are looking for. | |
2831 | * | |
2832 | * Returns a pointer to the found RAW_EXTENSION data, or NULL if not found. | |
2833 | */ | |
cd998837 MC |
2834 | RAW_EXTENSION *tls_get_extension_by_type(RAW_EXTENSION *exts, size_t numexts, |
2835 | unsigned int type) | |
1ab3836b MC |
2836 | { |
2837 | size_t loop; | |
2838 | ||
2839 | for (loop = 0; loop < numexts; loop++) { | |
2840 | if (exts[loop].type == type) | |
2841 | return &exts[loop]; | |
2842 | } | |
2843 | ||
2844 | return NULL; | |
2845 | } | |
2846 | ||
1d97c843 | 2847 | /*- |
1ab3836b | 2848 | * Gets the ticket information supplied by the client if any. |
e7f0d921 | 2849 | * |
1ab3836b | 2850 | * hello: The parsed ClientHello data |
c519e89f BM |
2851 | * ret: (output) on return, if a ticket was decrypted, then this is set to |
2852 | * point to the resulting session. | |
2853 | * | |
2854 | * If s->tls_session_secret_cb is set then we are expecting a pre-shared key | |
2855 | * ciphersuite, in which case we have no use for session tickets and one will | |
2856 | * never be decrypted, nor will s->tlsext_ticket_expected be set to 1. | |
2857 | * | |
2858 | * Returns: | |
2859 | * -1: fatal error, either from parsing or decrypting the ticket. | |
2860 | * 0: no ticket was found (or was ignored, based on settings). | |
2861 | * 1: a zero length extension was found, indicating that the client supports | |
2862 | * session tickets but doesn't currently have one to offer. | |
2863 | * 2: either s->tls_session_secret_cb was set, or a ticket was offered but | |
2864 | * couldn't be decrypted because of a non-fatal error. | |
2865 | * 3: a ticket was successfully decrypted and *ret was set. | |
2866 | * | |
2867 | * Side effects: | |
2868 | * Sets s->tlsext_ticket_expected to 1 if the server will have to issue | |
2869 | * a new session ticket to the client because the client indicated support | |
2870 | * (and s->tls_session_secret_cb is NULL) but the client either doesn't have | |
2871 | * a session ticket or we couldn't use the one it gave us, or if | |
2872 | * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket. | |
2873 | * Otherwise, s->tlsext_ticket_expected is set to 0. | |
6434abbf | 2874 | */ |
1ab3836b MC |
2875 | int tls_get_ticket_from_client(SSL *s, CLIENTHELLO_MSG *hello, |
2876 | SSL_SESSION **ret) | |
0f113f3e | 2877 | { |
1ab3836b MC |
2878 | int retv; |
2879 | const unsigned char *etick; | |
2880 | size_t size; | |
2881 | RAW_EXTENSION *ticketext; | |
e7f0d921 | 2882 | |
0f113f3e MC |
2883 | *ret = NULL; |
2884 | s->tlsext_ticket_expected = 0; | |
2885 | ||
2886 | /* | |
2887 | * If tickets disabled behave as if no ticket present to permit stateful | |
2888 | * resumption. | |
2889 | */ | |
1ab3836b | 2890 | if (s->version <= SSL3_VERSION || !tls_use_ticket(s)) |
0f113f3e | 2891 | return 0; |
9ceb2426 | 2892 | |
cd998837 MC |
2893 | ticketext = tls_get_extension_by_type(hello->pre_proc_exts, |
2894 | hello->num_extensions, | |
2895 | TLSEXT_TYPE_session_ticket); | |
1ab3836b MC |
2896 | if (ticketext == NULL) |
2897 | return 0; | |
2898 | ||
2899 | size = PACKET_remaining(&ticketext->data); | |
2900 | if (size == 0) { | |
2901 | /* | |
2902 | * The client will accept a ticket but doesn't currently have | |
2903 | * one. | |
2904 | */ | |
2905 | s->tlsext_ticket_expected = 1; | |
2906 | return 1; | |
9ceb2426 | 2907 | } |
1ab3836b MC |
2908 | if (s->tls_session_secret_cb) { |
2909 | /* | |
2910 | * Indicate that the ticket couldn't be decrypted rather than | |
2911 | * generating the session from ticket now, trigger | |
2912 | * abbreviated handshake based on external mechanism to | |
2913 | * calculate the master secret later. | |
2914 | */ | |
2915 | return 2; | |
2916 | } | |
2917 | if (!PACKET_get_bytes(&ticketext->data, &etick, size)) { | |
2918 | /* Shouldn't ever happen */ | |
2919 | return -1; | |
2920 | } | |
2921 | retv = tls_decrypt_ticket(s, etick, size, hello->session_id, | |
2922 | hello->session_id_len, ret); | |
2923 | switch (retv) { | |
2924 | case 2: /* ticket couldn't be decrypted */ | |
2925 | s->tlsext_ticket_expected = 1; | |
2926 | return 2; | |
9ceb2426 | 2927 | |
1ab3836b MC |
2928 | case 3: /* ticket was decrypted */ |
2929 | return 3; | |
9ceb2426 | 2930 | |
1ab3836b MC |
2931 | case 4: /* ticket decrypted but need to renew */ |
2932 | s->tlsext_ticket_expected = 1; | |
2933 | return 3; | |
e7f0d921 | 2934 | |
1ab3836b MC |
2935 | default: /* fatal error */ |
2936 | return -1; | |
0f113f3e | 2937 | } |
1ab3836b MC |
2938 | } |
2939 | ||
2940 | /* | |
de7d61d5 MC |
2941 | * Sets the extended master secret flag if the extension is present in the |
2942 | * ClientHello | |
2943 | * Returns: | |
2944 | * 1 on success | |
2945 | * 0 on error | |
1ab3836b | 2946 | */ |
902aca09 | 2947 | int tls_check_client_ems_support(SSL *s, const CLIENTHELLO_MSG *hello) |
1ab3836b MC |
2948 | { |
2949 | RAW_EXTENSION *emsext; | |
2950 | ||
2951 | s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS; | |
2952 | ||
2953 | if (s->version <= SSL3_VERSION) | |
2954 | return 1; | |
2955 | ||
cd998837 MC |
2956 | emsext = tls_get_extension_by_type(hello->pre_proc_exts, |
2957 | hello->num_extensions, | |
2958 | TLSEXT_TYPE_extended_master_secret); | |
1ab3836b MC |
2959 | |
2960 | /* | |
2961 | * No extensions is a success - we have successfully discovered that the | |
2962 | * client doesn't support EMS. | |
2963 | */ | |
2964 | if (emsext == NULL) | |
2965 | return 1; | |
2966 | ||
2967 | /* The extensions must always be empty */ | |
2968 | if (PACKET_remaining(&emsext->data) != 0) | |
2969 | return 0; | |
2970 | ||
2971 | s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS; | |
2972 | ||
2973 | return 1; | |
0f113f3e | 2974 | } |
6434abbf | 2975 | |
1d97c843 TH |
2976 | /*- |
2977 | * tls_decrypt_ticket attempts to decrypt a session ticket. | |
c519e89f BM |
2978 | * |
2979 | * etick: points to the body of the session ticket extension. | |
8483a003 | 2980 | * eticklen: the length of the session tickets extension. |
c519e89f BM |
2981 | * sess_id: points at the session ID. |
2982 | * sesslen: the length of the session ID. | |
2983 | * psess: (output) on return, if a ticket was decrypted, then this is set to | |
2984 | * point to the resulting session. | |
2985 | * | |
2986 | * Returns: | |
bf7c6817 | 2987 | * -2: fatal error, malloc failure. |
c519e89f BM |
2988 | * -1: fatal error, either from parsing or decrypting the ticket. |
2989 | * 2: the ticket couldn't be decrypted. | |
2990 | * 3: a ticket was successfully decrypted and *psess was set. | |
2991 | * 4: same as 3, but the ticket needs to be renewed. | |
2992 | */ | |
0f113f3e | 2993 | static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, |
d736bc1a | 2994 | size_t eticklen, const unsigned char *sess_id, |
ec60ccc1 | 2995 | size_t sesslen, SSL_SESSION **psess) |
0f113f3e MC |
2996 | { |
2997 | SSL_SESSION *sess; | |
2998 | unsigned char *sdec; | |
2999 | const unsigned char *p; | |
348240c6 MC |
3000 | int slen, renew_ticket = 0, ret = -1, declen; |
3001 | size_t mlen; | |
0f113f3e | 3002 | unsigned char tick_hmac[EVP_MAX_MD_SIZE]; |
bf7c6817 | 3003 | HMAC_CTX *hctx = NULL; |
846ec07d | 3004 | EVP_CIPHER_CTX *ctx; |
0f113f3e | 3005 | SSL_CTX *tctx = s->initial_ctx; |
e97763c9 | 3006 | |
0f113f3e | 3007 | /* Initialize session ticket encryption and HMAC contexts */ |
bf7c6817 RL |
3008 | hctx = HMAC_CTX_new(); |
3009 | if (hctx == NULL) | |
3010 | return -2; | |
846ec07d | 3011 | ctx = EVP_CIPHER_CTX_new(); |
35b1a433 MC |
3012 | if (ctx == NULL) { |
3013 | ret = -2; | |
3014 | goto err; | |
3015 | } | |
0f113f3e MC |
3016 | if (tctx->tlsext_ticket_key_cb) { |
3017 | unsigned char *nctick = (unsigned char *)etick; | |
3018 | int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16, | |
846ec07d | 3019 | ctx, hctx, 0); |
0f113f3e | 3020 | if (rv < 0) |
35b1a433 MC |
3021 | goto err; |
3022 | if (rv == 0) { | |
3023 | ret = 2; | |
3024 | goto err; | |
3025 | } | |
0f113f3e MC |
3026 | if (rv == 2) |
3027 | renew_ticket = 1; | |
3028 | } else { | |
3029 | /* Check key name matches */ | |
4e2e1ec9 TS |
3030 | if (memcmp(etick, tctx->tlsext_tick_key_name, |
3031 | sizeof(tctx->tlsext_tick_key_name)) != 0) { | |
35b1a433 MC |
3032 | ret = 2; |
3033 | goto err; | |
3034 | } | |
4e2e1ec9 TS |
3035 | if (HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key, |
3036 | sizeof(tctx->tlsext_tick_hmac_key), | |
5f3d93e4 | 3037 | EVP_sha256(), NULL) <= 0 |
a230b26e EK |
3038 | || EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, |
3039 | tctx->tlsext_tick_aes_key, | |
3040 | etick + sizeof(tctx->tlsext_tick_key_name)) <= | |
3041 | 0) { | |
5f3d93e4 | 3042 | goto err; |
a230b26e | 3043 | } |
0f113f3e MC |
3044 | } |
3045 | /* | |
3046 | * Attempt to process session ticket, first conduct sanity and integrity | |
3047 | * checks on ticket. | |
3048 | */ | |
bf7c6817 | 3049 | mlen = HMAC_size(hctx); |
348240c6 | 3050 | if (mlen == 0) { |
5f3d93e4 | 3051 | goto err; |
0f113f3e | 3052 | } |
e97763c9 DSH |
3053 | /* Sanity check ticket length: must exceed keyname + IV + HMAC */ |
3054 | if (eticklen <= | |
348240c6 | 3055 | TLSEXT_KEYNAME_LENGTH + EVP_CIPHER_CTX_iv_length(ctx) + mlen) { |
e97763c9 DSH |
3056 | ret = 2; |
3057 | goto err; | |
3058 | } | |
0f113f3e MC |
3059 | eticklen -= mlen; |
3060 | /* Check HMAC of encrypted ticket */ | |
bf7c6817 | 3061 | if (HMAC_Update(hctx, etick, eticklen) <= 0 |
a230b26e | 3062 | || HMAC_Final(hctx, tick_hmac, NULL) <= 0) { |
5f3d93e4 MC |
3063 | goto err; |
3064 | } | |
bf7c6817 | 3065 | HMAC_CTX_free(hctx); |
0f113f3e | 3066 | if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) { |
846ec07d | 3067 | EVP_CIPHER_CTX_free(ctx); |
0f113f3e MC |
3068 | return 2; |
3069 | } | |
3070 | /* Attempt to decrypt session data */ | |
3071 | /* Move p after IV to start of encrypted ticket, update length */ | |
846ec07d RL |
3072 | p = etick + 16 + EVP_CIPHER_CTX_iv_length(ctx); |
3073 | eticklen -= 16 + EVP_CIPHER_CTX_iv_length(ctx); | |
0f113f3e | 3074 | sdec = OPENSSL_malloc(eticklen); |
348240c6 MC |
3075 | if (sdec == NULL || EVP_DecryptUpdate(ctx, sdec, &slen, p, |
3076 | (int)eticklen) <= 0) { | |
846ec07d | 3077 | EVP_CIPHER_CTX_free(ctx); |
d1247df2 | 3078 | OPENSSL_free(sdec); |
0f113f3e MC |
3079 | return -1; |
3080 | } | |
348240c6 | 3081 | if (EVP_DecryptFinal(ctx, sdec + slen, &declen) <= 0) { |
846ec07d | 3082 | EVP_CIPHER_CTX_free(ctx); |
0f113f3e MC |
3083 | OPENSSL_free(sdec); |
3084 | return 2; | |
3085 | } | |
348240c6 | 3086 | slen += declen; |
846ec07d RL |
3087 | EVP_CIPHER_CTX_free(ctx); |
3088 | ctx = NULL; | |
0f113f3e MC |
3089 | p = sdec; |
3090 | ||
3091 | sess = d2i_SSL_SESSION(NULL, &p, slen); | |
3092 | OPENSSL_free(sdec); | |
3093 | if (sess) { | |
3094 | /* | |
3095 | * The session ID, if non-empty, is used by some clients to detect | |
3096 | * that the ticket has been accepted. So we copy it to the session | |
3097 | * structure. If it is empty set length to zero as required by | |
3098 | * standard. | |
3099 | */ | |
3100 | if (sesslen) | |
3101 | memcpy(sess->session_id, sess_id, sesslen); | |
3102 | sess->session_id_length = sesslen; | |
3103 | *psess = sess; | |
3104 | if (renew_ticket) | |
3105 | return 4; | |
3106 | else | |
3107 | return 3; | |
3108 | } | |
3109 | ERR_clear_error(); | |
3110 | /* | |
3111 | * For session parse failure, indicate that we need to send a new ticket. | |
3112 | */ | |
3113 | return 2; | |
a230b26e | 3114 | err: |
846ec07d | 3115 | EVP_CIPHER_CTX_free(ctx); |
bf7c6817 | 3116 | HMAC_CTX_free(hctx); |
35b1a433 | 3117 | return ret; |
0f113f3e | 3118 | } |
6434abbf | 3119 | |
6b7be581 DSH |
3120 | /* Tables to translate from NIDs to TLS v1.2 ids */ |
3121 | ||
0f113f3e MC |
3122 | typedef struct { |
3123 | int nid; | |
3124 | int id; | |
3125 | } tls12_lookup; | |
6b7be581 | 3126 | |
d97ed219 | 3127 | static const tls12_lookup tls12_md[] = { |
0f113f3e MC |
3128 | {NID_md5, TLSEXT_hash_md5}, |
3129 | {NID_sha1, TLSEXT_hash_sha1}, | |
3130 | {NID_sha224, TLSEXT_hash_sha224}, | |
3131 | {NID_sha256, TLSEXT_hash_sha256}, | |
3132 | {NID_sha384, TLSEXT_hash_sha384}, | |
e44380a9 DB |
3133 | {NID_sha512, TLSEXT_hash_sha512}, |
3134 | {NID_id_GostR3411_94, TLSEXT_hash_gostr3411}, | |
3135 | {NID_id_GostR3411_2012_256, TLSEXT_hash_gostr34112012_256}, | |
3136 | {NID_id_GostR3411_2012_512, TLSEXT_hash_gostr34112012_512}, | |
6b7be581 DSH |
3137 | }; |
3138 | ||
d97ed219 | 3139 | static const tls12_lookup tls12_sig[] = { |
0f113f3e MC |
3140 | {EVP_PKEY_RSA, TLSEXT_signature_rsa}, |
3141 | {EVP_PKEY_DSA, TLSEXT_signature_dsa}, | |
e44380a9 DB |
3142 | {EVP_PKEY_EC, TLSEXT_signature_ecdsa}, |
3143 | {NID_id_GostR3410_2001, TLSEXT_signature_gostr34102001}, | |
3144 | {NID_id_GostR3410_2012_256, TLSEXT_signature_gostr34102012_256}, | |
3145 | {NID_id_GostR3410_2012_512, TLSEXT_signature_gostr34102012_512} | |
6b7be581 DSH |
3146 | }; |
3147 | ||
d97ed219 | 3148 | static int tls12_find_id(int nid, const tls12_lookup *table, size_t tlen) |
0f113f3e MC |
3149 | { |
3150 | size_t i; | |
3151 | for (i = 0; i < tlen; i++) { | |
3152 | if (table[i].nid == nid) | |
3153 | return table[i].id; | |
3154 | } | |
3155 | return -1; | |
3156 | } | |
e7f8ff43 | 3157 | |
d97ed219 | 3158 | static int tls12_find_nid(int id, const tls12_lookup *table, size_t tlen) |
0f113f3e MC |
3159 | { |
3160 | size_t i; | |
3161 | for (i = 0; i < tlen; i++) { | |
3162 | if ((table[i].id) == id) | |
3163 | return table[i].nid; | |
3164 | } | |
3165 | return NID_undef; | |
3166 | } | |
3167 | ||
6400f338 MC |
3168 | int tls12_get_sigandhash(WPACKET *pkt, const EVP_PKEY *pk, const EVP_MD *md) |
3169 | { | |
3170 | int sig_id, md_id; | |
418a18a2 MC |
3171 | |
3172 | if (md == NULL) | |
6400f338 MC |
3173 | return 0; |
3174 | md_id = tls12_find_id(EVP_MD_type(md), tls12_md, OSSL_NELEM(tls12_md)); | |
3175 | if (md_id == -1) | |
3176 | return 0; | |
3177 | sig_id = tls12_get_sigid(pk); | |
3178 | if (sig_id == -1) | |
3179 | return 0; | |
08029dfa | 3180 | if (!WPACKET_put_bytes_u8(pkt, md_id) || !WPACKET_put_bytes_u8(pkt, sig_id)) |
6400f338 MC |
3181 | return 0; |
3182 | ||
3183 | return 1; | |
3184 | } | |
3185 | ||
a2f9200f | 3186 | int tls12_get_sigid(const EVP_PKEY *pk) |
0f113f3e | 3187 | { |
3aeb9348 | 3188 | return tls12_find_id(EVP_PKEY_id(pk), tls12_sig, OSSL_NELEM(tls12_sig)); |
0f113f3e MC |
3189 | } |
3190 | ||
3191 | typedef struct { | |
3192 | int nid; | |
3193 | int secbits; | |
7afd2312 | 3194 | int md_idx; |
e44380a9 | 3195 | unsigned char tlsext_hash; |
0f113f3e | 3196 | } tls12_hash_info; |
b362ccab DSH |
3197 | |
3198 | static const tls12_hash_info tls12_md_info[] = { | |
7afd2312 DSH |
3199 | {NID_md5, 64, SSL_MD_MD5_IDX, TLSEXT_hash_md5}, |
3200 | {NID_sha1, 80, SSL_MD_SHA1_IDX, TLSEXT_hash_sha1}, | |
3201 | {NID_sha224, 112, SSL_MD_SHA224_IDX, TLSEXT_hash_sha224}, | |
3202 | {NID_sha256, 128, SSL_MD_SHA256_IDX, TLSEXT_hash_sha256}, | |
3203 | {NID_sha384, 192, SSL_MD_SHA384_IDX, TLSEXT_hash_sha384}, | |
3204 | {NID_sha512, 256, SSL_MD_SHA512_IDX, TLSEXT_hash_sha512}, | |
a230b26e EK |
3205 | {NID_id_GostR3411_94, 128, SSL_MD_GOST94_IDX, TLSEXT_hash_gostr3411}, |
3206 | {NID_id_GostR3411_2012_256, 128, SSL_MD_GOST12_256_IDX, | |
3207 | TLSEXT_hash_gostr34112012_256}, | |
3208 | {NID_id_GostR3411_2012_512, 256, SSL_MD_GOST12_512_IDX, | |
3209 | TLSEXT_hash_gostr34112012_512}, | |
b362ccab | 3210 | }; |
a2f9200f | 3211 | |
b362ccab | 3212 | static const tls12_hash_info *tls12_get_hash_info(unsigned char hash_alg) |
0f113f3e | 3213 | { |
e44380a9 | 3214 | unsigned int i; |
0f113f3e MC |
3215 | if (hash_alg == 0) |
3216 | return NULL; | |
e44380a9 | 3217 | |
a230b26e | 3218 | for (i = 0; i < OSSL_NELEM(tls12_md_info); i++) { |
e44380a9 DB |
3219 | if (tls12_md_info[i].tlsext_hash == hash_alg) |
3220 | return tls12_md_info + i; | |
3221 | } | |
3222 | ||
3223 | return NULL; | |
0f113f3e | 3224 | } |
a2f9200f | 3225 | |
b362ccab | 3226 | const EVP_MD *tls12_get_hash(unsigned char hash_alg) |
0f113f3e MC |
3227 | { |
3228 | const tls12_hash_info *inf; | |
3229 | if (hash_alg == TLSEXT_hash_md5 && FIPS_mode()) | |
3230 | return NULL; | |
3231 | inf = tls12_get_hash_info(hash_alg); | |
7afd2312 | 3232 | if (!inf) |
0f113f3e | 3233 | return NULL; |
7afd2312 | 3234 | return ssl_md(inf->md_idx); |
0f113f3e | 3235 | } |
a2f9200f | 3236 | |
4453cd8c | 3237 | static int tls12_get_pkey_idx(unsigned char sig_alg) |
0f113f3e MC |
3238 | { |
3239 | switch (sig_alg) { | |
e481f9b9 | 3240 | #ifndef OPENSSL_NO_RSA |
0f113f3e MC |
3241 | case TLSEXT_signature_rsa: |
3242 | return SSL_PKEY_RSA_SIGN; | |
e481f9b9 MC |
3243 | #endif |
3244 | #ifndef OPENSSL_NO_DSA | |
0f113f3e MC |
3245 | case TLSEXT_signature_dsa: |
3246 | return SSL_PKEY_DSA_SIGN; | |
e481f9b9 MC |
3247 | #endif |
3248 | #ifndef OPENSSL_NO_EC | |
0f113f3e MC |
3249 | case TLSEXT_signature_ecdsa: |
3250 | return SSL_PKEY_ECC; | |
e481f9b9 | 3251 | #endif |
a230b26e | 3252 | #ifndef OPENSSL_NO_GOST |
e44380a9 DB |
3253 | case TLSEXT_signature_gostr34102001: |
3254 | return SSL_PKEY_GOST01; | |
3255 | ||
3256 | case TLSEXT_signature_gostr34102012_256: | |
3257 | return SSL_PKEY_GOST12_256; | |
3258 | ||
3259 | case TLSEXT_signature_gostr34102012_512: | |
3260 | return SSL_PKEY_GOST12_512; | |
a230b26e | 3261 | #endif |
0f113f3e MC |
3262 | } |
3263 | return -1; | |
3264 | } | |
4453cd8c DSH |
3265 | |
3266 | /* Convert TLS 1.2 signature algorithm extension values into NIDs */ | |
3267 | static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid, | |
0f113f3e MC |
3268 | int *psignhash_nid, const unsigned char *data) |
3269 | { | |
330dcb09 | 3270 | int sign_nid = NID_undef, hash_nid = NID_undef; |
0f113f3e MC |
3271 | if (!phash_nid && !psign_nid && !psignhash_nid) |
3272 | return; | |
3273 | if (phash_nid || psignhash_nid) { | |
b6eb9827 | 3274 | hash_nid = tls12_find_nid(data[0], tls12_md, OSSL_NELEM(tls12_md)); |
0f113f3e MC |
3275 | if (phash_nid) |
3276 | *phash_nid = hash_nid; | |
3277 | } | |
3278 | if (psign_nid || psignhash_nid) { | |
b6eb9827 | 3279 | sign_nid = tls12_find_nid(data[1], tls12_sig, OSSL_NELEM(tls12_sig)); |
0f113f3e MC |
3280 | if (psign_nid) |
3281 | *psign_nid = sign_nid; | |
3282 | } | |
3283 | if (psignhash_nid) { | |
330dcb09 | 3284 | if (sign_nid == NID_undef || hash_nid == NID_undef |
a230b26e | 3285 | || OBJ_find_sigid_by_algs(psignhash_nid, hash_nid, sign_nid) <= 0) |
0f113f3e MC |
3286 | *psignhash_nid = NID_undef; |
3287 | } | |
3288 | } | |
3289 | ||
b362ccab DSH |
3290 | /* Check to see if a signature algorithm is allowed */ |
3291 | static int tls12_sigalg_allowed(SSL *s, int op, const unsigned char *ptmp) | |
0f113f3e MC |
3292 | { |
3293 | /* See if we have an entry in the hash table and it is enabled */ | |
3294 | const tls12_hash_info *hinf = tls12_get_hash_info(ptmp[0]); | |
7afd2312 | 3295 | if (hinf == NULL || ssl_md(hinf->md_idx) == NULL) |
0f113f3e MC |
3296 | return 0; |
3297 | /* See if public key algorithm allowed */ | |
3298 | if (tls12_get_pkey_idx(ptmp[1]) == -1) | |
3299 | return 0; | |
3300 | /* Finally see if security callback allows it */ | |
3301 | return ssl_security(s, op, hinf->secbits, hinf->nid, (void *)ptmp); | |
3302 | } | |
3303 | ||
3304 | /* | |
3305 | * Get a mask of disabled public key algorithms based on supported signature | |
3306 | * algorithms. For example if no signature algorithm supports RSA then RSA is | |
3307 | * disabled. | |
b362ccab DSH |
3308 | */ |
3309 | ||
90d9e49a | 3310 | void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op) |
0f113f3e MC |
3311 | { |
3312 | const unsigned char *sigalgs; | |
3313 | size_t i, sigalgslen; | |
3314 | int have_rsa = 0, have_dsa = 0, have_ecdsa = 0; | |
3315 | /* | |
3316 | * Now go through all signature algorithms seeing if we support any for | |
3317 | * RSA, DSA, ECDSA. Do this for all versions not just TLS 1.2. To keep | |
3318 | * down calls to security callback only check if we have to. | |
3319 | */ | |
3320 | sigalgslen = tls12_get_psigalgs(s, &sigalgs); | |
3321 | for (i = 0; i < sigalgslen; i += 2, sigalgs += 2) { | |
3322 | switch (sigalgs[1]) { | |
e481f9b9 | 3323 | #ifndef OPENSSL_NO_RSA |
0f113f3e MC |
3324 | case TLSEXT_signature_rsa: |
3325 | if (!have_rsa && tls12_sigalg_allowed(s, op, sigalgs)) | |
3326 | have_rsa = 1; | |
3327 | break; | |
e481f9b9 MC |
3328 | #endif |
3329 | #ifndef OPENSSL_NO_DSA | |
0f113f3e MC |
3330 | case TLSEXT_signature_dsa: |
3331 | if (!have_dsa && tls12_sigalg_allowed(s, op, sigalgs)) | |
3332 | have_dsa = 1; | |
3333 | break; | |
e481f9b9 MC |
3334 | #endif |
3335 | #ifndef OPENSSL_NO_EC | |
0f113f3e MC |
3336 | case TLSEXT_signature_ecdsa: |
3337 | if (!have_ecdsa && tls12_sigalg_allowed(s, op, sigalgs)) | |
3338 | have_ecdsa = 1; | |
3339 | break; | |
e481f9b9 | 3340 | #endif |
0f113f3e MC |
3341 | } |
3342 | } | |
3343 | if (!have_rsa) | |
3344 | *pmask_a |= SSL_aRSA; | |
3345 | if (!have_dsa) | |
3346 | *pmask_a |= SSL_aDSS; | |
3347 | if (!have_ecdsa) | |
3348 | *pmask_a |= SSL_aECDSA; | |
3349 | } | |
b362ccab | 3350 | |
ae2f7b37 | 3351 | int tls12_copy_sigalgs(SSL *s, WPACKET *pkt, |
2c7b4dbc MC |
3352 | const unsigned char *psig, size_t psiglen) |
3353 | { | |
3354 | size_t i; | |
c0f9e23c | 3355 | |
2c7b4dbc MC |
3356 | for (i = 0; i < psiglen; i += 2, psig += 2) { |
3357 | if (tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, psig)) { | |
08029dfa MC |
3358 | if (!WPACKET_put_bytes_u8(pkt, psig[0]) |
3359 | || !WPACKET_put_bytes_u8(pkt, psig[1])) | |
2c7b4dbc MC |
3360 | return 0; |
3361 | } | |
3362 | } | |
3363 | return 1; | |
3364 | } | |
3365 | ||
4453cd8c | 3366 | /* Given preference and allowed sigalgs set shared sigalgs */ |
348240c6 MC |
3367 | static size_t tls12_shared_sigalgs(SSL *s, TLS_SIGALGS *shsig, |
3368 | const unsigned char *pref, size_t preflen, | |
3369 | const unsigned char *allow, size_t allowlen) | |
0f113f3e MC |
3370 | { |
3371 | const unsigned char *ptmp, *atmp; | |
3372 | size_t i, j, nmatch = 0; | |
3373 | for (i = 0, ptmp = pref; i < preflen; i += 2, ptmp += 2) { | |
3374 | /* Skip disabled hashes or signature algorithms */ | |
3375 | if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, ptmp)) | |
3376 | continue; | |
3377 | for (j = 0, atmp = allow; j < allowlen; j += 2, atmp += 2) { | |
3378 | if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1]) { | |
3379 | nmatch++; | |
3380 | if (shsig) { | |
3381 | shsig->rhash = ptmp[0]; | |
3382 | shsig->rsign = ptmp[1]; | |
3383 | tls1_lookup_sigalg(&shsig->hash_nid, | |
3384 | &shsig->sign_nid, | |
3385 | &shsig->signandhash_nid, ptmp); | |
3386 | shsig++; | |
3387 | } | |
3388 | break; | |
3389 | } | |
3390 | } | |
3391 | } | |
3392 | return nmatch; | |
3393 | } | |
4453cd8c DSH |
3394 | |
3395 | /* Set shared signature algorithms for SSL structures */ | |
3396 | static int tls1_set_shared_sigalgs(SSL *s) | |
0f113f3e MC |
3397 | { |
3398 | const unsigned char *pref, *allow, *conf; | |
3399 | size_t preflen, allowlen, conflen; | |
3400 | size_t nmatch; | |
3401 | TLS_SIGALGS *salgs = NULL; | |
3402 | CERT *c = s->cert; | |
3403 | unsigned int is_suiteb = tls1_suiteb(s); | |
b548a1f1 RS |
3404 | |
3405 | OPENSSL_free(c->shared_sigalgs); | |
3406 | c->shared_sigalgs = NULL; | |
3407 | c->shared_sigalgslen = 0; | |
0f113f3e MC |
3408 | /* If client use client signature algorithms if not NULL */ |
3409 | if (!s->server && c->client_sigalgs && !is_suiteb) { | |
3410 | conf = c->client_sigalgs; | |
3411 | conflen = c->client_sigalgslen; | |
3412 | } else if (c->conf_sigalgs && !is_suiteb) { | |
3413 | conf = c->conf_sigalgs; | |
3414 | conflen = c->conf_sigalgslen; | |
3415 | } else | |
3416 | conflen = tls12_get_psigalgs(s, &conf); | |
3417 | if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb) { | |
3418 | pref = conf; | |
3419 | preflen = conflen; | |
76106e60 DSH |
3420 | allow = s->s3->tmp.peer_sigalgs; |
3421 | allowlen = s->s3->tmp.peer_sigalgslen; | |
0f113f3e MC |
3422 | } else { |
3423 | allow = conf; | |
3424 | allowlen = conflen; | |
76106e60 DSH |
3425 | pref = s->s3->tmp.peer_sigalgs; |
3426 | preflen = s->s3->tmp.peer_sigalgslen; | |
0f113f3e MC |
3427 | } |
3428 | nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen); | |
34e3edbf DSH |
3429 | if (nmatch) { |
3430 | salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS)); | |
a71edf3b | 3431 | if (salgs == NULL) |
34e3edbf DSH |
3432 | return 0; |
3433 | nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen); | |
3434 | } else { | |
3435 | salgs = NULL; | |
3436 | } | |
0f113f3e MC |
3437 | c->shared_sigalgs = salgs; |
3438 | c->shared_sigalgslen = nmatch; | |
3439 | return 1; | |
3440 | } | |
4453cd8c | 3441 | |
6b7be581 DSH |
3442 | /* Set preferred digest for each key type */ |
3443 | ||
d736bc1a | 3444 | int tls1_save_sigalgs(SSL *s, const unsigned char *data, size_t dsize) |
0f113f3e MC |
3445 | { |
3446 | CERT *c = s->cert; | |
3447 | /* Extension ignored for inappropriate versions */ | |
3448 | if (!SSL_USE_SIGALGS(s)) | |
3449 | return 1; | |
3450 | /* Should never happen */ | |
3451 | if (!c) | |
3452 | return 0; | |
3453 | ||
76106e60 DSH |
3454 | OPENSSL_free(s->s3->tmp.peer_sigalgs); |
3455 | s->s3->tmp.peer_sigalgs = OPENSSL_malloc(dsize); | |
3456 | if (s->s3->tmp.peer_sigalgs == NULL) | |
0f113f3e | 3457 | return 0; |
76106e60 DSH |
3458 | s->s3->tmp.peer_sigalgslen = dsize; |
3459 | memcpy(s->s3->tmp.peer_sigalgs, data, dsize); | |
0f113f3e MC |
3460 | return 1; |
3461 | } | |
6b7be581 | 3462 | |
c800c27a | 3463 | int tls1_process_sigalgs(SSL *s) |
0f113f3e MC |
3464 | { |
3465 | int idx; | |
3466 | size_t i; | |
3467 | const EVP_MD *md; | |
d376e57d | 3468 | const EVP_MD **pmd = s->s3->tmp.md; |
f7d53487 | 3469 | uint32_t *pvalid = s->s3->tmp.valid_flags; |
0f113f3e MC |
3470 | CERT *c = s->cert; |
3471 | TLS_SIGALGS *sigptr; | |
3472 | if (!tls1_set_shared_sigalgs(s)) | |
3473 | return 0; | |
3474 | ||
0f113f3e MC |
3475 | for (i = 0, sigptr = c->shared_sigalgs; |
3476 | i < c->shared_sigalgslen; i++, sigptr++) { | |
3477 | idx = tls12_get_pkey_idx(sigptr->rsign); | |
d376e57d | 3478 | if (idx > 0 && pmd[idx] == NULL) { |
0f113f3e | 3479 | md = tls12_get_hash(sigptr->rhash); |
d376e57d | 3480 | pmd[idx] = md; |
6383d316 | 3481 | pvalid[idx] = CERT_PKEY_EXPLICIT_SIGN; |
0f113f3e | 3482 | if (idx == SSL_PKEY_RSA_SIGN) { |
6383d316 | 3483 | pvalid[SSL_PKEY_RSA_ENC] = CERT_PKEY_EXPLICIT_SIGN; |
d376e57d | 3484 | pmd[SSL_PKEY_RSA_ENC] = md; |
0f113f3e MC |
3485 | } |
3486 | } | |
6b7be581 | 3487 | |
0f113f3e MC |
3488 | } |
3489 | /* | |
3490 | * In strict mode leave unset digests as NULL to indicate we can't use | |
3491 | * the certificate for signing. | |
3492 | */ | |
3493 | if (!(s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) { | |
3494 | /* | |
3495 | * Set any remaining keys to default values. NOTE: if alg is not | |
3496 | * supported it stays as NULL. | |
3497 | */ | |
e481f9b9 | 3498 | #ifndef OPENSSL_NO_DSA |
d376e57d DSH |
3499 | if (pmd[SSL_PKEY_DSA_SIGN] == NULL) |
3500 | pmd[SSL_PKEY_DSA_SIGN] = EVP_sha1(); | |
e481f9b9 MC |
3501 | #endif |
3502 | #ifndef OPENSSL_NO_RSA | |
d376e57d DSH |
3503 | if (pmd[SSL_PKEY_RSA_SIGN] == NULL) { |
3504 | pmd[SSL_PKEY_RSA_SIGN] = EVP_sha1(); | |
3505 | pmd[SSL_PKEY_RSA_ENC] = EVP_sha1(); | |
0f113f3e | 3506 | } |
e481f9b9 MC |
3507 | #endif |
3508 | #ifndef OPENSSL_NO_EC | |
d376e57d DSH |
3509 | if (pmd[SSL_PKEY_ECC] == NULL) |
3510 | pmd[SSL_PKEY_ECC] = EVP_sha1(); | |
e481f9b9 | 3511 | #endif |
a230b26e | 3512 | #ifndef OPENSSL_NO_GOST |
e44380a9 DB |
3513 | if (pmd[SSL_PKEY_GOST01] == NULL) |
3514 | pmd[SSL_PKEY_GOST01] = EVP_get_digestbynid(NID_id_GostR3411_94); | |
3515 | if (pmd[SSL_PKEY_GOST12_256] == NULL) | |
a230b26e EK |
3516 | pmd[SSL_PKEY_GOST12_256] = |
3517 | EVP_get_digestbynid(NID_id_GostR3411_2012_256); | |
e44380a9 | 3518 | if (pmd[SSL_PKEY_GOST12_512] == NULL) |
a230b26e EK |
3519 | pmd[SSL_PKEY_GOST12_512] = |
3520 | EVP_get_digestbynid(NID_id_GostR3411_2012_512); | |
3521 | #endif | |
0f113f3e MC |
3522 | } |
3523 | return 1; | |
3524 | } | |
4817504d | 3525 | |
e7f8ff43 | 3526 | int SSL_get_sigalgs(SSL *s, int idx, |
0f113f3e MC |
3527 | int *psign, int *phash, int *psignhash, |
3528 | unsigned char *rsig, unsigned char *rhash) | |
3529 | { | |
76106e60 | 3530 | const unsigned char *psig = s->s3->tmp.peer_sigalgs; |
348240c6 MC |
3531 | size_t numsigalgs = s->s3->tmp.peer_sigalgslen / 2; |
3532 | if (psig == NULL || numsigalgs > INT_MAX) | |
0f113f3e MC |
3533 | return 0; |
3534 | if (idx >= 0) { | |
3535 | idx <<= 1; | |
76106e60 | 3536 | if (idx >= (int)s->s3->tmp.peer_sigalgslen) |
0f113f3e MC |
3537 | return 0; |
3538 | psig += idx; | |
3539 | if (rhash) | |
3540 | *rhash = psig[0]; | |
3541 | if (rsig) | |
3542 | *rsig = psig[1]; | |
3543 | tls1_lookup_sigalg(phash, psign, psignhash, psig); | |
3544 | } | |
348240c6 | 3545 | return (int)numsigalgs; |
0f113f3e | 3546 | } |
4453cd8c DSH |
3547 | |
3548 | int SSL_get_shared_sigalgs(SSL *s, int idx, | |
0f113f3e MC |
3549 | int *psign, int *phash, int *psignhash, |
3550 | unsigned char *rsig, unsigned char *rhash) | |
3551 | { | |
3552 | TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs; | |
348240c6 MC |
3553 | if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen |
3554 | || s->cert->shared_sigalgslen > INT_MAX) | |
0f113f3e MC |
3555 | return 0; |
3556 | shsigalgs += idx; | |
3557 | if (phash) | |
3558 | *phash = shsigalgs->hash_nid; | |
3559 | if (psign) | |
3560 | *psign = shsigalgs->sign_nid; | |
3561 | if (psignhash) | |
3562 | *psignhash = shsigalgs->signandhash_nid; | |
3563 | if (rsig) | |
3564 | *rsig = shsigalgs->rsign; | |
3565 | if (rhash) | |
3566 | *rhash = shsigalgs->rhash; | |
348240c6 | 3567 | return (int)s->cert->shared_sigalgslen; |
0f113f3e MC |
3568 | } |
3569 | ||
e481f9b9 | 3570 | #define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num * 2) |
0f229cce | 3571 | |
0f113f3e MC |
3572 | typedef struct { |
3573 | size_t sigalgcnt; | |
3574 | int sigalgs[MAX_SIGALGLEN]; | |
3575 | } sig_cb_st; | |
0f229cce | 3576 | |
431f458d DSH |
3577 | static void get_sigorhash(int *psig, int *phash, const char *str) |
3578 | { | |
3579 | if (strcmp(str, "RSA") == 0) { | |
3580 | *psig = EVP_PKEY_RSA; | |
3581 | } else if (strcmp(str, "DSA") == 0) { | |
3582 | *psig = EVP_PKEY_DSA; | |
3583 | } else if (strcmp(str, "ECDSA") == 0) { | |
3584 | *psig = EVP_PKEY_EC; | |
3585 | } else { | |
3586 | *phash = OBJ_sn2nid(str); | |
3587 | if (*phash == NID_undef) | |
3588 | *phash = OBJ_ln2nid(str); | |
3589 | } | |
3590 | } | |
3591 | ||
0f229cce | 3592 | static int sig_cb(const char *elem, int len, void *arg) |
0f113f3e MC |
3593 | { |
3594 | sig_cb_st *sarg = arg; | |
3595 | size_t i; | |
3596 | char etmp[20], *p; | |
431f458d | 3597 | int sig_alg = NID_undef, hash_alg = NID_undef; |
2747d73c KR |
3598 | if (elem == NULL) |
3599 | return 0; | |
0f113f3e MC |
3600 | if (sarg->sigalgcnt == MAX_SIGALGLEN) |
3601 | return 0; | |
3602 | if (len > (int)(sizeof(etmp) - 1)) | |
3603 | return 0; | |
3604 | memcpy(etmp, elem, len); | |
3605 | etmp[len] = 0; | |
3606 | p = strchr(etmp, '+'); | |
3607 | if (!p) | |
3608 | return 0; | |
3609 | *p = 0; | |
3610 | p++; | |
3611 | if (!*p) | |
3612 | return 0; | |
3613 | ||
431f458d DSH |
3614 | get_sigorhash(&sig_alg, &hash_alg, etmp); |
3615 | get_sigorhash(&sig_alg, &hash_alg, p); | |
0f113f3e | 3616 | |
431f458d | 3617 | if (sig_alg == NID_undef || hash_alg == NID_undef) |
0f113f3e MC |
3618 | return 0; |
3619 | ||
3620 | for (i = 0; i < sarg->sigalgcnt; i += 2) { | |
3621 | if (sarg->sigalgs[i] == sig_alg && sarg->sigalgs[i + 1] == hash_alg) | |
3622 | return 0; | |
3623 | } | |
3624 | sarg->sigalgs[sarg->sigalgcnt++] = hash_alg; | |
3625 | sarg->sigalgs[sarg->sigalgcnt++] = sig_alg; | |
3626 | return 1; | |
3627 | } | |
3628 | ||
3629 | /* | |
9d22666e | 3630 | * Set supported signature algorithms based on a colon separated list of the |
0f113f3e MC |
3631 | * form sig+hash e.g. RSA+SHA512:DSA+SHA512 |
3632 | */ | |
3dbc46df | 3633 | int tls1_set_sigalgs_list(CERT *c, const char *str, int client) |
0f113f3e MC |
3634 | { |
3635 | sig_cb_st sig; | |
3636 | sig.sigalgcnt = 0; | |
3637 | if (!CONF_parse_list(str, ':', 1, sig_cb, &sig)) | |
3638 | return 0; | |
3639 | if (c == NULL) | |
3640 | return 1; | |
3641 | return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client); | |
3642 | } | |
3643 | ||
a230b26e | 3644 | int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client) |
0f113f3e MC |
3645 | { |
3646 | unsigned char *sigalgs, *sptr; | |
3647 | int rhash, rsign; | |
3648 | size_t i; | |
3649 | if (salglen & 1) | |
3650 | return 0; | |
3651 | sigalgs = OPENSSL_malloc(salglen); | |
3652 | if (sigalgs == NULL) | |
3653 | return 0; | |
3654 | for (i = 0, sptr = sigalgs; i < salglen; i += 2) { | |
b6eb9827 DSH |
3655 | rhash = tls12_find_id(*psig_nids++, tls12_md, OSSL_NELEM(tls12_md)); |
3656 | rsign = tls12_find_id(*psig_nids++, tls12_sig, OSSL_NELEM(tls12_sig)); | |
0f113f3e MC |
3657 | |
3658 | if (rhash == -1 || rsign == -1) | |
3659 | goto err; | |
3660 | *sptr++ = rhash; | |
3661 | *sptr++ = rsign; | |
3662 | } | |
3663 | ||
3664 | if (client) { | |
b548a1f1 | 3665 | OPENSSL_free(c->client_sigalgs); |
0f113f3e MC |
3666 | c->client_sigalgs = sigalgs; |
3667 | c->client_sigalgslen = salglen; | |
3668 | } else { | |
b548a1f1 | 3669 | OPENSSL_free(c->conf_sigalgs); |
0f113f3e MC |
3670 | c->conf_sigalgs = sigalgs; |
3671 | c->conf_sigalgslen = salglen; | |
3672 | } | |
3673 | ||
3674 | return 1; | |
3675 | ||
3676 | err: | |
3677 | OPENSSL_free(sigalgs); | |
3678 | return 0; | |
3679 | } | |
4453cd8c | 3680 | |
d61ff83b | 3681 | static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid) |
0f113f3e MC |
3682 | { |
3683 | int sig_nid; | |
3684 | size_t i; | |
3685 | if (default_nid == -1) | |
3686 | return 1; | |
3687 | sig_nid = X509_get_signature_nid(x); | |
3688 | if (default_nid) | |
3689 | return sig_nid == default_nid ? 1 : 0; | |
3690 | for (i = 0; i < c->shared_sigalgslen; i++) | |
3691 | if (sig_nid == c->shared_sigalgs[i].signandhash_nid) | |
3692 | return 1; | |
3693 | return 0; | |
3694 | } | |
3695 | ||
6dbb6219 DSH |
3696 | /* Check to see if a certificate issuer name matches list of CA names */ |
3697 | static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x) | |
0f113f3e MC |
3698 | { |
3699 | X509_NAME *nm; | |
3700 | int i; | |
3701 | nm = X509_get_issuer_name(x); | |
3702 | for (i = 0; i < sk_X509_NAME_num(names); i++) { | |
3703 | if (!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i))) | |
3704 | return 1; | |
3705 | } | |
3706 | return 0; | |
3707 | } | |
3708 | ||
3709 | /* | |
3710 | * Check certificate chain is consistent with TLS extensions and is usable by | |
3711 | * server. This servers two purposes: it allows users to check chains before | |
3712 | * passing them to the server and it allows the server to check chains before | |
3713 | * attempting to use them. | |
d61ff83b | 3714 | */ |
6dbb6219 DSH |
3715 | |
3716 | /* Flags which need to be set for a certificate when stict mode not set */ | |
3717 | ||
e481f9b9 | 3718 | #define CERT_PKEY_VALID_FLAGS \ |
0f113f3e | 3719 | (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM) |
6dbb6219 | 3720 | /* Strict mode flags */ |
e481f9b9 | 3721 | #define CERT_PKEY_STRICT_FLAGS \ |
0f113f3e MC |
3722 | (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \ |
3723 | | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE) | |
6dbb6219 | 3724 | |
d61ff83b | 3725 | int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain, |
0f113f3e MC |
3726 | int idx) |
3727 | { | |
3728 | int i; | |
3729 | int rv = 0; | |
3730 | int check_flags = 0, strict_mode; | |
3731 | CERT_PKEY *cpk = NULL; | |
3732 | CERT *c = s->cert; | |
f7d53487 | 3733 | uint32_t *pvalid; |
0f113f3e MC |
3734 | unsigned int suiteb_flags = tls1_suiteb(s); |
3735 | /* idx == -1 means checking server chains */ | |
3736 | if (idx != -1) { | |
3737 | /* idx == -2 means checking client certificate chains */ | |
3738 | if (idx == -2) { | |
3739 | cpk = c->key; | |
348240c6 | 3740 | idx = (int)(cpk - c->pkeys); |
0f113f3e MC |
3741 | } else |
3742 | cpk = c->pkeys + idx; | |
6383d316 | 3743 | pvalid = s->s3->tmp.valid_flags + idx; |
0f113f3e MC |
3744 | x = cpk->x509; |
3745 | pk = cpk->privatekey; | |
3746 | chain = cpk->chain; | |
3747 | strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT; | |
3748 | /* If no cert or key, forget it */ | |
3749 | if (!x || !pk) | |
3750 | goto end; | |
0f113f3e MC |
3751 | } else { |
3752 | if (!x || !pk) | |
d813f9eb | 3753 | return 0; |
0f113f3e MC |
3754 | idx = ssl_cert_type(x, pk); |
3755 | if (idx == -1) | |
d813f9eb | 3756 | return 0; |
6383d316 DSH |
3757 | pvalid = s->s3->tmp.valid_flags + idx; |
3758 | ||
0f113f3e MC |
3759 | if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT) |
3760 | check_flags = CERT_PKEY_STRICT_FLAGS; | |
3761 | else | |
3762 | check_flags = CERT_PKEY_VALID_FLAGS; | |
3763 | strict_mode = 1; | |
3764 | } | |
3765 | ||
3766 | if (suiteb_flags) { | |
3767 | int ok; | |
3768 | if (check_flags) | |
3769 | check_flags |= CERT_PKEY_SUITEB; | |
3770 | ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags); | |
3771 | if (ok == X509_V_OK) | |
3772 | rv |= CERT_PKEY_SUITEB; | |
3773 | else if (!check_flags) | |
3774 | goto end; | |
3775 | } | |
3776 | ||
3777 | /* | |
3778 | * Check all signature algorithms are consistent with signature | |
3779 | * algorithms extension if TLS 1.2 or later and strict mode. | |
3780 | */ | |
3781 | if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode) { | |
3782 | int default_nid; | |
3783 | unsigned char rsign = 0; | |
76106e60 | 3784 | if (s->s3->tmp.peer_sigalgs) |
0f113f3e MC |
3785 | default_nid = 0; |
3786 | /* If no sigalgs extension use defaults from RFC5246 */ | |
3787 | else { | |
3788 | switch (idx) { | |
3789 | case SSL_PKEY_RSA_ENC: | |
3790 | case SSL_PKEY_RSA_SIGN: | |
0f113f3e MC |
3791 | rsign = TLSEXT_signature_rsa; |
3792 | default_nid = NID_sha1WithRSAEncryption; | |
3793 | break; | |
3794 | ||
3795 | case SSL_PKEY_DSA_SIGN: | |
0f113f3e MC |
3796 | rsign = TLSEXT_signature_dsa; |
3797 | default_nid = NID_dsaWithSHA1; | |
3798 | break; | |
3799 | ||
3800 | case SSL_PKEY_ECC: | |
3801 | rsign = TLSEXT_signature_ecdsa; | |
3802 | default_nid = NID_ecdsa_with_SHA1; | |
3803 | break; | |
3804 | ||
e44380a9 DB |
3805 | case SSL_PKEY_GOST01: |
3806 | rsign = TLSEXT_signature_gostr34102001; | |
3807 | default_nid = NID_id_GostR3411_94_with_GostR3410_2001; | |
3808 | break; | |
3809 | ||
3810 | case SSL_PKEY_GOST12_256: | |
3811 | rsign = TLSEXT_signature_gostr34102012_256; | |
3812 | default_nid = NID_id_tc26_signwithdigest_gost3410_2012_256; | |
3813 | break; | |
3814 | ||
3815 | case SSL_PKEY_GOST12_512: | |
3816 | rsign = TLSEXT_signature_gostr34102012_512; | |
3817 | default_nid = NID_id_tc26_signwithdigest_gost3410_2012_512; | |
3818 | break; | |
3819 | ||
0f113f3e MC |
3820 | default: |
3821 | default_nid = -1; | |
3822 | break; | |
3823 | } | |
3824 | } | |
3825 | /* | |
3826 | * If peer sent no signature algorithms extension and we have set | |
3827 | * preferred signature algorithms check we support sha1. | |
3828 | */ | |
3829 | if (default_nid > 0 && c->conf_sigalgs) { | |
3830 | size_t j; | |
3831 | const unsigned char *p = c->conf_sigalgs; | |
3832 | for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2) { | |
3833 | if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign) | |
3834 | break; | |
3835 | } | |
3836 | if (j == c->conf_sigalgslen) { | |
3837 | if (check_flags) | |
3838 | goto skip_sigs; | |
3839 | else | |
3840 | goto end; | |
3841 | } | |
3842 | } | |
3843 | /* Check signature algorithm of each cert in chain */ | |
3844 | if (!tls1_check_sig_alg(c, x, default_nid)) { | |
3845 | if (!check_flags) | |
3846 | goto end; | |
3847 | } else | |
3848 | rv |= CERT_PKEY_EE_SIGNATURE; | |
3849 | rv |= CERT_PKEY_CA_SIGNATURE; | |
3850 | for (i = 0; i < sk_X509_num(chain); i++) { | |
3851 | if (!tls1_check_sig_alg(c, sk_X509_value(chain, i), default_nid)) { | |
3852 | if (check_flags) { | |
3853 | rv &= ~CERT_PKEY_CA_SIGNATURE; | |
3854 | break; | |
3855 | } else | |
3856 | goto end; | |
3857 | } | |
3858 | } | |
3859 | } | |
3860 | /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */ | |
3861 | else if (check_flags) | |
3862 | rv |= CERT_PKEY_EE_SIGNATURE | CERT_PKEY_CA_SIGNATURE; | |
3863 | skip_sigs: | |
3864 | /* Check cert parameters are consistent */ | |
3865 | if (tls1_check_cert_param(s, x, check_flags ? 1 : 2)) | |
3866 | rv |= CERT_PKEY_EE_PARAM; | |
3867 | else if (!check_flags) | |
3868 | goto end; | |
3869 | if (!s->server) | |
3870 | rv |= CERT_PKEY_CA_PARAM; | |
3871 | /* In strict mode check rest of chain too */ | |
3872 | else if (strict_mode) { | |
3873 | rv |= CERT_PKEY_CA_PARAM; | |
3874 | for (i = 0; i < sk_X509_num(chain); i++) { | |
3875 | X509 *ca = sk_X509_value(chain, i); | |
3876 | if (!tls1_check_cert_param(s, ca, 0)) { | |
3877 | if (check_flags) { | |
3878 | rv &= ~CERT_PKEY_CA_PARAM; | |
3879 | break; | |
3880 | } else | |
3881 | goto end; | |
3882 | } | |
3883 | } | |
3884 | } | |
3885 | if (!s->server && strict_mode) { | |
3886 | STACK_OF(X509_NAME) *ca_dn; | |
3887 | int check_type = 0; | |
3aeb9348 | 3888 | switch (EVP_PKEY_id(pk)) { |
0f113f3e MC |
3889 | case EVP_PKEY_RSA: |
3890 | check_type = TLS_CT_RSA_SIGN; | |
3891 | break; | |
3892 | case EVP_PKEY_DSA: | |
3893 | check_type = TLS_CT_DSS_SIGN; | |
3894 | break; | |
3895 | case EVP_PKEY_EC: | |
3896 | check_type = TLS_CT_ECDSA_SIGN; | |
3897 | break; | |
0f113f3e MC |
3898 | } |
3899 | if (check_type) { | |
3900 | const unsigned char *ctypes; | |
3901 | int ctypelen; | |
3902 | if (c->ctypes) { | |
3903 | ctypes = c->ctypes; | |
3904 | ctypelen = (int)c->ctype_num; | |
3905 | } else { | |
3906 | ctypes = (unsigned char *)s->s3->tmp.ctype; | |
3907 | ctypelen = s->s3->tmp.ctype_num; | |
3908 | } | |
3909 | for (i = 0; i < ctypelen; i++) { | |
3910 | if (ctypes[i] == check_type) { | |
3911 | rv |= CERT_PKEY_CERT_TYPE; | |
3912 | break; | |
3913 | } | |
3914 | } | |
3915 | if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags) | |
3916 | goto end; | |
3917 | } else | |
3918 | rv |= CERT_PKEY_CERT_TYPE; | |
3919 | ||
3920 | ca_dn = s->s3->tmp.ca_names; | |
3921 | ||
3922 | if (!sk_X509_NAME_num(ca_dn)) | |
3923 | rv |= CERT_PKEY_ISSUER_NAME; | |
3924 | ||
3925 | if (!(rv & CERT_PKEY_ISSUER_NAME)) { | |
3926 | if (ssl_check_ca_name(ca_dn, x)) | |
3927 | rv |= CERT_PKEY_ISSUER_NAME; | |
3928 | } | |
3929 | if (!(rv & CERT_PKEY_ISSUER_NAME)) { | |
3930 | for (i = 0; i < sk_X509_num(chain); i++) { | |
3931 | X509 *xtmp = sk_X509_value(chain, i); | |
3932 | if (ssl_check_ca_name(ca_dn, xtmp)) { | |
3933 | rv |= CERT_PKEY_ISSUER_NAME; | |
3934 | break; | |
3935 | } | |
3936 | } | |
3937 | } | |
3938 | if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME)) | |
3939 | goto end; | |
3940 | } else | |
3941 | rv |= CERT_PKEY_ISSUER_NAME | CERT_PKEY_CERT_TYPE; | |
3942 | ||
3943 | if (!check_flags || (rv & check_flags) == check_flags) | |
3944 | rv |= CERT_PKEY_VALID; | |
3945 | ||
3946 | end: | |
3947 | ||
3948 | if (TLS1_get_version(s) >= TLS1_2_VERSION) { | |
6383d316 | 3949 | if (*pvalid & CERT_PKEY_EXPLICIT_SIGN) |
0f113f3e | 3950 | rv |= CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN; |
d376e57d | 3951 | else if (s->s3->tmp.md[idx] != NULL) |
0f113f3e MC |
3952 | rv |= CERT_PKEY_SIGN; |
3953 | } else | |
3954 | rv |= CERT_PKEY_SIGN | CERT_PKEY_EXPLICIT_SIGN; | |
3955 | ||
3956 | /* | |
3957 | * When checking a CERT_PKEY structure all flags are irrelevant if the | |
3958 | * chain is invalid. | |
3959 | */ | |
3960 | if (!check_flags) { | |
3961 | if (rv & CERT_PKEY_VALID) | |
6383d316 | 3962 | *pvalid = rv; |
0f113f3e MC |
3963 | else { |
3964 | /* Preserve explicit sign flag, clear rest */ | |
6383d316 | 3965 | *pvalid &= CERT_PKEY_EXPLICIT_SIGN; |
0f113f3e MC |
3966 | return 0; |
3967 | } | |
3968 | } | |
3969 | return rv; | |
3970 | } | |
d61ff83b DSH |
3971 | |
3972 | /* Set validity of certificates in an SSL structure */ | |
3973 | void tls1_set_cert_validity(SSL *s) | |
0f113f3e | 3974 | { |
17dd65e6 MC |
3975 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC); |
3976 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN); | |
3977 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN); | |
17dd65e6 | 3978 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC); |
e44380a9 DB |
3979 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST01); |
3980 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_256); | |
3981 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_GOST12_512); | |
0f113f3e MC |
3982 | } |
3983 | ||
18d71588 DSH |
3984 | /* User level utiity function to check a chain is suitable */ |
3985 | int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain) | |
0f113f3e MC |
3986 | { |
3987 | return tls1_check_chain(s, x, pk, chain, -1); | |
3988 | } | |
d61ff83b | 3989 | |
09599b52 DSH |
3990 | #ifndef OPENSSL_NO_DH |
3991 | DH *ssl_get_auto_dh(SSL *s) | |
0f113f3e MC |
3992 | { |
3993 | int dh_secbits = 80; | |
3994 | if (s->cert->dh_tmp_auto == 2) | |
3995 | return DH_get_1024_160(); | |
adc5506a | 3996 | if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aPSK)) { |
0f113f3e MC |
3997 | if (s->s3->tmp.new_cipher->strength_bits == 256) |
3998 | dh_secbits = 128; | |
3999 | else | |
4000 | dh_secbits = 80; | |
4001 | } else { | |
4002 | CERT_PKEY *cpk = ssl_get_server_send_pkey(s); | |
4003 | dh_secbits = EVP_PKEY_security_bits(cpk->privatekey); | |
4004 | } | |
4005 | ||
4006 | if (dh_secbits >= 128) { | |
4007 | DH *dhp = DH_new(); | |
0aeddcfa | 4008 | BIGNUM *p, *g; |
a71edf3b | 4009 | if (dhp == NULL) |
0f113f3e | 4010 | return NULL; |
0aeddcfa MC |
4011 | g = BN_new(); |
4012 | if (g != NULL) | |
4013 | BN_set_word(g, 2); | |
0f113f3e | 4014 | if (dh_secbits >= 192) |
9021a5df | 4015 | p = BN_get_rfc3526_prime_8192(NULL); |
0f113f3e | 4016 | else |
9021a5df | 4017 | p = BN_get_rfc3526_prime_3072(NULL); |
0aeddcfa | 4018 | if (p == NULL || g == NULL || !DH_set0_pqg(dhp, p, NULL, g)) { |
0f113f3e | 4019 | DH_free(dhp); |
0aeddcfa MC |
4020 | BN_free(p); |
4021 | BN_free(g); | |
0f113f3e MC |
4022 | return NULL; |
4023 | } | |
4024 | return dhp; | |
4025 | } | |
4026 | if (dh_secbits >= 112) | |
4027 | return DH_get_2048_224(); | |
4028 | return DH_get_1024_160(); | |
4029 | } | |
09599b52 | 4030 | #endif |
b362ccab DSH |
4031 | |
4032 | static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op) | |
0f113f3e | 4033 | { |
72245f34 | 4034 | int secbits = -1; |
8382fd3a | 4035 | EVP_PKEY *pkey = X509_get0_pubkey(x); |
0f113f3e | 4036 | if (pkey) { |
72245f34 DSH |
4037 | /* |
4038 | * If no parameters this will return -1 and fail using the default | |
4039 | * security callback for any non-zero security level. This will | |
4040 | * reject keys which omit parameters but this only affects DSA and | |
4041 | * omission of parameters is never (?) done in practice. | |
4042 | */ | |
0f113f3e | 4043 | secbits = EVP_PKEY_security_bits(pkey); |
72245f34 | 4044 | } |
0f113f3e MC |
4045 | if (s) |
4046 | return ssl_security(s, op, secbits, 0, x); | |
4047 | else | |
4048 | return ssl_ctx_security(ctx, op, secbits, 0, x); | |
4049 | } | |
b362ccab DSH |
4050 | |
4051 | static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op) | |
0f113f3e MC |
4052 | { |
4053 | /* Lookup signature algorithm digest */ | |
4054 | int secbits = -1, md_nid = NID_undef, sig_nid; | |
221c7b55 DSH |
4055 | /* Don't check signature if self signed */ |
4056 | if ((X509_get_extension_flags(x) & EXFLAG_SS) != 0) | |
4057 | return 1; | |
0f113f3e MC |
4058 | sig_nid = X509_get_signature_nid(x); |
4059 | if (sig_nid && OBJ_find_sigid_algs(sig_nid, &md_nid, NULL)) { | |
4060 | const EVP_MD *md; | |
4061 | if (md_nid && (md = EVP_get_digestbynid(md_nid))) | |
4062 | secbits = EVP_MD_size(md) * 4; | |
4063 | } | |
4064 | if (s) | |
4065 | return ssl_security(s, op, secbits, md_nid, x); | |
4066 | else | |
4067 | return ssl_ctx_security(ctx, op, secbits, md_nid, x); | |
4068 | } | |
b362ccab DSH |
4069 | |
4070 | int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee) | |
0f113f3e MC |
4071 | { |
4072 | if (vfy) | |
4073 | vfy = SSL_SECOP_PEER; | |
4074 | if (is_ee) { | |
4075 | if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy)) | |
4076 | return SSL_R_EE_KEY_TOO_SMALL; | |
4077 | } else { | |
4078 | if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy)) | |
4079 | return SSL_R_CA_KEY_TOO_SMALL; | |
4080 | } | |
4081 | if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy)) | |
4082 | return SSL_R_CA_MD_TOO_WEAK; | |
4083 | return 1; | |
4084 | } | |
4085 | ||
4086 | /* | |
4087 | * Check security of a chain, if sk includes the end entity certificate then | |
4088 | * x is NULL. If vfy is 1 then we are verifying a peer chain and not sending | |
4089 | * one to the peer. Return values: 1 if ok otherwise error code to use | |
b362ccab DSH |
4090 | */ |
4091 | ||
4092 | int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy) | |
0f113f3e MC |
4093 | { |
4094 | int rv, start_idx, i; | |
4095 | if (x == NULL) { | |
4096 | x = sk_X509_value(sk, 0); | |
4097 | start_idx = 1; | |
4098 | } else | |
4099 | start_idx = 0; | |
4100 | ||
4101 | rv = ssl_security_cert(s, NULL, x, vfy, 1); | |
4102 | if (rv != 1) | |
4103 | return rv; | |
4104 | ||
4105 | for (i = start_idx; i < sk_X509_num(sk); i++) { | |
4106 | x = sk_X509_value(sk, i); | |
4107 | rv = ssl_security_cert(s, NULL, x, vfy, 0); | |
4108 | if (rv != 1) | |
4109 | return rv; | |
4110 | } | |
4111 | return 1; | |
4112 | } |