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-rw-r--r--src/lib/libssl/ssl_sigalgs.c355
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diff --git a/src/lib/libssl/ssl_sigalgs.c b/src/lib/libssl/ssl_sigalgs.c
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--- a/src/lib/libssl/ssl_sigalgs.c
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1/* $OpenBSD: ssl_sigalgs.c,v 1.37 2021/06/29 19:36:14 jsing Exp $ */
2/*
3 * Copyright (c) 2018-2020 Bob Beck <beck@openbsd.org>
4 * Copyright (c) 2021 Joel Sing <jsing@openbsd.org>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
13 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
15 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
16 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <string.h>
20#include <stdlib.h>
21
22#include <openssl/evp.h>
23#include <openssl/opensslconf.h>
24
25#include "bytestring.h"
26#include "ssl_locl.h"
27#include "ssl_sigalgs.h"
28#include "tls13_internal.h"
29
30const struct ssl_sigalg sigalgs[] = {
31 {
32 .value = SIGALG_RSA_PKCS1_SHA512,
33 .key_type = EVP_PKEY_RSA,
34 .md = EVP_sha512,
35 },
36 {
37 .value = SIGALG_ECDSA_SECP521R1_SHA512,
38 .key_type = EVP_PKEY_EC,
39 .md = EVP_sha512,
40 .curve_nid = NID_secp521r1,
41 },
42#ifndef OPENSSL_NO_GOST
43 {
44 .value = SIGALG_GOSTR12_512_STREEBOG_512,
45 .key_type = EVP_PKEY_GOSTR12_512,
46 .md = EVP_streebog512,
47 },
48#endif
49 {
50 .value = SIGALG_RSA_PKCS1_SHA384,
51 .key_type = EVP_PKEY_RSA,
52 .md = EVP_sha384,
53 },
54 {
55 .value = SIGALG_ECDSA_SECP384R1_SHA384,
56 .key_type = EVP_PKEY_EC,
57 .md = EVP_sha384,
58 .curve_nid = NID_secp384r1,
59 },
60 {
61 .value = SIGALG_RSA_PKCS1_SHA256,
62 .key_type = EVP_PKEY_RSA,
63 .md = EVP_sha256,
64 },
65 {
66 .value = SIGALG_ECDSA_SECP256R1_SHA256,
67 .key_type = EVP_PKEY_EC,
68 .md = EVP_sha256,
69 .curve_nid = NID_X9_62_prime256v1,
70 },
71#ifndef OPENSSL_NO_GOST
72 {
73 .value = SIGALG_GOSTR12_256_STREEBOG_256,
74 .key_type = EVP_PKEY_GOSTR12_256,
75 .md = EVP_streebog256,
76 },
77 {
78 .value = SIGALG_GOSTR01_GOST94,
79 .key_type = EVP_PKEY_GOSTR01,
80 .md = EVP_gostr341194,
81 },
82#endif
83 {
84 .value = SIGALG_RSA_PSS_RSAE_SHA256,
85 .key_type = EVP_PKEY_RSA,
86 .md = EVP_sha256,
87 .flags = SIGALG_FLAG_RSA_PSS,
88 },
89 {
90 .value = SIGALG_RSA_PSS_RSAE_SHA384,
91 .key_type = EVP_PKEY_RSA,
92 .md = EVP_sha384,
93 .flags = SIGALG_FLAG_RSA_PSS,
94 },
95 {
96 .value = SIGALG_RSA_PSS_RSAE_SHA512,
97 .key_type = EVP_PKEY_RSA,
98 .md = EVP_sha512,
99 .flags = SIGALG_FLAG_RSA_PSS,
100 },
101 {
102 .value = SIGALG_RSA_PSS_PSS_SHA256,
103 .key_type = EVP_PKEY_RSA,
104 .md = EVP_sha256,
105 .flags = SIGALG_FLAG_RSA_PSS,
106 },
107 {
108 .value = SIGALG_RSA_PSS_PSS_SHA384,
109 .key_type = EVP_PKEY_RSA,
110 .md = EVP_sha384,
111 .flags = SIGALG_FLAG_RSA_PSS,
112 },
113 {
114 .value = SIGALG_RSA_PSS_PSS_SHA512,
115 .key_type = EVP_PKEY_RSA,
116 .md = EVP_sha512,
117 .flags = SIGALG_FLAG_RSA_PSS,
118 },
119 {
120 .value = SIGALG_RSA_PKCS1_SHA224,
121 .key_type = EVP_PKEY_RSA,
122 .md = EVP_sha224,
123 },
124 {
125 .value = SIGALG_ECDSA_SECP224R1_SHA224,
126 .key_type = EVP_PKEY_EC,
127 .md = EVP_sha224,
128 },
129 {
130 .value = SIGALG_RSA_PKCS1_SHA1,
131 .key_type = EVP_PKEY_RSA,
132 .md = EVP_sha1,
133 },
134 {
135 .value = SIGALG_ECDSA_SHA1,
136 .key_type = EVP_PKEY_EC,
137 .md = EVP_sha1,
138 },
139 {
140 .value = SIGALG_RSA_PKCS1_MD5_SHA1,
141 .key_type = EVP_PKEY_RSA,
142 .md = EVP_md5_sha1,
143 },
144 {
145 .value = SIGALG_NONE,
146 },
147};
148
149/* Sigalgs for TLSv1.3, in preference order. */
150const uint16_t tls13_sigalgs[] = {
151 SIGALG_RSA_PSS_RSAE_SHA512,
152 SIGALG_RSA_PKCS1_SHA512,
153 SIGALG_ECDSA_SECP521R1_SHA512,
154 SIGALG_RSA_PSS_RSAE_SHA384,
155 SIGALG_RSA_PKCS1_SHA384,
156 SIGALG_ECDSA_SECP384R1_SHA384,
157 SIGALG_RSA_PSS_RSAE_SHA256,
158 SIGALG_RSA_PKCS1_SHA256,
159 SIGALG_ECDSA_SECP256R1_SHA256,
160};
161const size_t tls13_sigalgs_len = (sizeof(tls13_sigalgs) / sizeof(tls13_sigalgs[0]));
162
163/* Sigalgs for TLSv1.2, in preference order. */
164const uint16_t tls12_sigalgs[] = {
165 SIGALG_RSA_PSS_RSAE_SHA512,
166 SIGALG_RSA_PKCS1_SHA512,
167 SIGALG_ECDSA_SECP521R1_SHA512,
168 SIGALG_RSA_PSS_RSAE_SHA384,
169 SIGALG_RSA_PKCS1_SHA384,
170 SIGALG_ECDSA_SECP384R1_SHA384,
171 SIGALG_RSA_PSS_RSAE_SHA256,
172 SIGALG_RSA_PKCS1_SHA256,
173 SIGALG_ECDSA_SECP256R1_SHA256,
174 SIGALG_RSA_PKCS1_SHA1, /* XXX */
175 SIGALG_ECDSA_SHA1, /* XXX */
176};
177const size_t tls12_sigalgs_len = (sizeof(tls12_sigalgs) / sizeof(tls12_sigalgs[0]));
178
179static void
180ssl_sigalgs_for_version(uint16_t tls_version, const uint16_t **out_values,
181 size_t *out_len)
182{
183 if (tls_version >= TLS1_3_VERSION) {
184 *out_values = tls13_sigalgs;
185 *out_len = tls13_sigalgs_len;
186 } else {
187 *out_values = tls12_sigalgs;
188 *out_len = tls12_sigalgs_len;
189 }
190}
191
192static const struct ssl_sigalg *
193ssl_sigalg_lookup(uint16_t value)
194{
195 int i;
196
197 for (i = 0; sigalgs[i].value != SIGALG_NONE; i++) {
198 if (sigalgs[i].value == value)
199 return &sigalgs[i];
200 }
201
202 return NULL;
203}
204
205static const struct ssl_sigalg *
206ssl_sigalg_from_value(SSL *s, uint16_t value)
207{
208 const uint16_t *values;
209 size_t len;
210 int i;
211
212 ssl_sigalgs_for_version(S3I(s)->hs.negotiated_tls_version,
213 &values, &len);
214
215 for (i = 0; i < len; i++) {
216 if (values[i] == value)
217 return ssl_sigalg_lookup(value);
218 }
219
220 return NULL;
221}
222
223int
224ssl_sigalgs_build(uint16_t tls_version, CBB *cbb)
225{
226 const uint16_t *values;
227 size_t len;
228 size_t i;
229
230 ssl_sigalgs_for_version(tls_version, &values, &len);
231
232 /* Add values in order as long as they are supported. */
233 for (i = 0; i < len; i++) {
234 /* Do not allow the legacy value for < 1.2 to be used. */
235 if (values[i] == SIGALG_RSA_PKCS1_MD5_SHA1)
236 return 0;
237 if (ssl_sigalg_lookup(values[i]) == NULL)
238 return 0;
239 if (!CBB_add_u16(cbb, values[i]))
240 return 0;
241 }
242 return 1;
243}
244
245static const struct ssl_sigalg *
246ssl_sigalg_for_legacy(SSL *s, EVP_PKEY *pkey)
247{
248 /* Default signature algorithms used for TLSv1.2 and earlier. */
249 switch (pkey->type) {
250 case EVP_PKEY_RSA:
251 if (S3I(s)->hs.negotiated_tls_version < TLS1_2_VERSION)
252 return ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1);
253 return ssl_sigalg_lookup(SIGALG_RSA_PKCS1_SHA1);
254 case EVP_PKEY_EC:
255 return ssl_sigalg_lookup(SIGALG_ECDSA_SHA1);
256#ifndef OPENSSL_NO_GOST
257 case EVP_PKEY_GOSTR01:
258 return ssl_sigalg_lookup(SIGALG_GOSTR01_GOST94);
259#endif
260 }
261 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE);
262 return (NULL);
263}
264
265static int
266ssl_sigalg_pkey_ok(SSL *s, const struct ssl_sigalg *sigalg, EVP_PKEY *pkey)
267{
268 if (sigalg == NULL || pkey == NULL)
269 return 0;
270 if (sigalg->key_type != pkey->type)
271 return 0;
272
273 /* RSA PSS must have a sufficiently large RSA key. */
274 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS)) {
275 if (pkey->type != EVP_PKEY_RSA ||
276 EVP_PKEY_size(pkey) < (2 * EVP_MD_size(sigalg->md()) + 2))
277 return 0;
278 }
279
280 if (S3I(s)->hs.negotiated_tls_version < TLS1_3_VERSION)
281 return 1;
282
283 /* RSA cannot be used without PSS in TLSv1.3. */
284 if (sigalg->key_type == EVP_PKEY_RSA &&
285 (sigalg->flags & SIGALG_FLAG_RSA_PSS) == 0)
286 return 0;
287
288 /* Ensure that curve matches for EC keys. */
289 if (pkey->type == EVP_PKEY_EC) {
290 if (sigalg->curve_nid == 0)
291 return 0;
292 if (EC_GROUP_get_curve_name(EC_KEY_get0_group(
293 EVP_PKEY_get0_EC_KEY(pkey))) != sigalg->curve_nid)
294 return 0;
295 }
296
297 return 1;
298}
299
300const struct ssl_sigalg *
301ssl_sigalg_select(SSL *s, EVP_PKEY *pkey)
302{
303 CBS cbs;
304
305 if (!SSL_USE_SIGALGS(s))
306 return ssl_sigalg_for_legacy(s, pkey);
307
308 /*
309 * RFC 5246 allows a TLS 1.2 client to send no sigalgs extension,
310 * in which case the server must use the default.
311 */
312 if (S3I(s)->hs.negotiated_tls_version < TLS1_3_VERSION &&
313 S3I(s)->hs.sigalgs == NULL)
314 return ssl_sigalg_for_legacy(s, pkey);
315
316 /*
317 * If we get here, we have client or server sent sigalgs, use one.
318 */
319 CBS_init(&cbs, S3I(s)->hs.sigalgs, S3I(s)->hs.sigalgs_len);
320 while (CBS_len(&cbs) > 0) {
321 const struct ssl_sigalg *sigalg;
322 uint16_t sigalg_value;
323
324 if (!CBS_get_u16(&cbs, &sigalg_value))
325 return 0;
326
327 if ((sigalg = ssl_sigalg_from_value(s, sigalg_value)) == NULL)
328 continue;
329 if (ssl_sigalg_pkey_ok(s, sigalg, pkey))
330 return sigalg;
331 }
332
333 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE);
334 return NULL;
335}
336
337const struct ssl_sigalg *
338ssl_sigalg_for_peer(SSL *s, EVP_PKEY *pkey, uint16_t sigalg_value)
339{
340 const struct ssl_sigalg *sigalg;
341
342 if (!SSL_USE_SIGALGS(s))
343 return ssl_sigalg_for_legacy(s, pkey);
344
345 if ((sigalg = ssl_sigalg_from_value(s, sigalg_value)) == NULL) {
346 SSLerror(s, SSL_R_UNKNOWN_DIGEST);
347 return (NULL);
348 }
349 if (!ssl_sigalg_pkey_ok(s, sigalg, pkey)) {
350 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE);
351 return (NULL);
352 }
353
354 return sigalg;
355}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2026-02-12 17:46:10 +0000