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0f113f3e | 1 | /* |
fecb3aae | 2 | * Copyright 2001-2022 The OpenSSL Project Authors. All Rights Reserved. |
9b4dc830 | 3 | * |
0c496700 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
b1322259 RS |
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 | |
9b4dc830 DSH |
8 | */ |
9 | ||
eaf8a40d | 10 | #include <string.h> |
9b4dc830 DSH |
11 | #include <openssl/ocsp.h> |
12 | #include <openssl/err.h> | |
eaf8a40d TM |
13 | #include "internal/sizes.h" |
14 | #include "ocsp_local.h" | |
9b4dc830 | 15 | |
0f113f3e | 16 | static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, |
a773b52a | 17 | STACK_OF(X509) *certs, unsigned long flags); |
9b4dc830 | 18 | static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id); |
a773b52a | 19 | static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain); |
0f113f3e MC |
20 | static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, |
21 | OCSP_CERTID **ret); | |
22 | static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid, | |
23 | STACK_OF(OCSP_SINGLERESP) *sresp); | |
a773b52a | 24 | static int ocsp_check_delegated(X509 *x); |
0f113f3e | 25 | static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, |
8cc86b81 | 26 | const X509_NAME *nm, STACK_OF(X509) *certs, |
a773b52a | 27 | unsigned long flags); |
9b4dc830 | 28 | |
4a71bee6 | 29 | /* Returns 1 on success, 0 on failure, or -1 on fatal error */ |
4ff993d7 DDO |
30 | static int ocsp_verify_signer(X509 *signer, int response, |
31 | X509_STORE *st, unsigned long flags, | |
4a71bee6 DDO |
32 | STACK_OF(X509) *untrusted, STACK_OF(X509) **chain) |
33 | { | |
34 | X509_STORE_CTX *ctx = X509_STORE_CTX_new(); | |
35 | X509_VERIFY_PARAM *vp; | |
36 | int ret = -1; | |
9b4dc830 | 37 | |
4a71bee6 | 38 | if (ctx == NULL) { |
e077455e | 39 | ERR_raise(ERR_LIB_OCSP, ERR_R_X509_LIB); |
4a71bee6 DDO |
40 | goto end; |
41 | } | |
42 | if (!X509_STORE_CTX_init(ctx, st, signer, untrusted)) { | |
9311d0c4 | 43 | ERR_raise(ERR_LIB_OCSP, ERR_R_X509_LIB); |
4a71bee6 DDO |
44 | goto end; |
45 | } | |
4ff993d7 DDO |
46 | if ((vp = X509_STORE_CTX_get0_param(ctx)) == NULL) |
47 | goto end; | |
48 | if ((flags & OCSP_PARTIAL_CHAIN) != 0) | |
4a71bee6 | 49 | X509_VERIFY_PARAM_set_flags(vp, X509_V_FLAG_PARTIAL_CHAIN); |
4ff993d7 DDO |
50 | if (response |
51 | && X509_get_ext_by_NID(signer, NID_id_pkix_OCSP_noCheck, -1) >= 0) | |
52 | /* | |
53 | * Locally disable revocation status checking for OCSP responder cert. | |
126e3771 | 54 | * Done here for CRLs; should be done also for OCSP-based checks. |
4ff993d7 DDO |
55 | */ |
56 | X509_VERIFY_PARAM_clear_flags(vp, X509_V_FLAG_CRL_CHECK); | |
4a71bee6 DDO |
57 | X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_OCSP_HELPER); |
58 | X509_STORE_CTX_set_trust(ctx, X509_TRUST_OCSP_REQUEST); | |
4a71bee6 DDO |
59 | |
60 | ret = X509_verify_cert(ctx); | |
61 | if (ret <= 0) { | |
21f89f54 MC |
62 | int err = X509_STORE_CTX_get_error(ctx); |
63 | ||
a150f8e1 | 64 | ERR_raise_data(ERR_LIB_OCSP, OCSP_R_CERTIFICATE_VERIFY_ERROR, |
21f89f54 | 65 | "Verify error: %s", X509_verify_cert_error_string(err)); |
4a71bee6 DDO |
66 | goto end; |
67 | } | |
68 | if (chain != NULL) | |
69 | *chain = X509_STORE_CTX_get1_chain(ctx); | |
70 | ||
71 | end: | |
72 | X509_STORE_CTX_free(ctx); | |
73 | return ret; | |
74 | } | |
75 | ||
76 | static int ocsp_verify(OCSP_REQUEST *req, OCSP_BASICRESP *bs, | |
77 | X509 *signer, unsigned long flags) | |
78 | { | |
79 | EVP_PKEY *skey; | |
80 | int ret = 1; | |
81 | ||
82 | if ((flags & OCSP_NOSIGS) == 0) { | |
83 | if ((skey = X509_get0_pubkey(signer)) == NULL) { | |
9311d0c4 | 84 | ERR_raise(ERR_LIB_OCSP, OCSP_R_NO_SIGNER_KEY); |
4a71bee6 DDO |
85 | return -1; |
86 | } | |
87 | if (req != NULL) | |
e6c2f964 | 88 | ret = OCSP_REQUEST_verify(req, skey, signer->libctx, signer->propq); |
4a71bee6 | 89 | else |
e6c2f964 | 90 | ret = OCSP_BASICRESP_verify(bs, skey, signer->libctx, signer->propq); |
4a71bee6 | 91 | if (ret <= 0) |
9311d0c4 | 92 | ERR_raise(ERR_LIB_OCSP, OCSP_R_SIGNATURE_FAILURE); |
4a71bee6 DDO |
93 | } |
94 | return ret; | |
95 | } | |
96 | ||
97 | /* Verify a basic response message */ | |
9b4dc830 | 98 | int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs, |
0f113f3e MC |
99 | X509_STORE *st, unsigned long flags) |
100 | { | |
101 | X509 *signer, *x; | |
102 | STACK_OF(X509) *chain = NULL; | |
4ca5efc2 | 103 | STACK_OF(X509) *untrusted = NULL; |
4a71bee6 | 104 | int ret = ocsp_find_signer(&signer, bs, certs, flags); |
a773b52a | 105 | |
4a71bee6 | 106 | if (ret == 0) { |
9311d0c4 | 107 | ERR_raise(ERR_LIB_OCSP, OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND); |
d32f5d87 | 108 | goto end; |
f0e0fd51 | 109 | } |
4a71bee6 | 110 | if ((ret == 2) && (flags & OCSP_TRUSTOTHER) != 0) |
0f113f3e | 111 | flags |= OCSP_NOVERIFY; |
eeccc237 | 112 | |
4a71bee6 DDO |
113 | if ((ret = ocsp_verify(NULL, bs, signer, flags)) <= 0) |
114 | goto end; | |
115 | if ((flags & OCSP_NOVERIFY) == 0) { | |
116 | ret = -1; | |
d53b437f DDO |
117 | if ((flags & OCSP_NOCHAIN) == 0) { |
118 | if ((untrusted = sk_X509_dup(bs->certs)) == NULL) | |
119 | goto end; | |
eeccc237 | 120 | if (!X509_add_certs(untrusted, certs, X509_ADD_FLAG_DEFAULT)) |
4a71bee6 | 121 | goto end; |
4ca5efc2 | 122 | } |
4ff993d7 | 123 | ret = ocsp_verify_signer(signer, 1, st, flags, untrusted, &chain); |
4a71bee6 | 124 | if (ret <= 0) |
d32f5d87 | 125 | goto end; |
4a71bee6 | 126 | if ((flags & OCSP_NOCHECKS) != 0) { |
0f113f3e MC |
127 | ret = 1; |
128 | goto end; | |
129 | } | |
130 | /* | |
131 | * At this point we have a valid certificate chain need to verify it | |
132 | * against the OCSP issuer criteria. | |
133 | */ | |
a773b52a | 134 | ret = ocsp_check_issuer(bs, chain); |
0f113f3e MC |
135 | |
136 | /* If fatal error or valid match then finish */ | |
137 | if (ret != 0) | |
64a1385a | 138 | goto end; |
0f113f3e MC |
139 | |
140 | /* | |
141 | * Easy case: explicitly trusted. Get root CA and check for explicit | |
142 | * trust | |
143 | */ | |
4a71bee6 | 144 | if ((flags & OCSP_NOEXPLICIT) != 0) |
0f113f3e MC |
145 | goto end; |
146 | ||
147 | x = sk_X509_value(chain, sk_X509_num(chain) - 1); | |
148 | if (X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED) { | |
9311d0c4 | 149 | ERR_raise(ERR_LIB_OCSP, OCSP_R_ROOT_CA_NOT_TRUSTED); |
4a71bee6 DDO |
150 | ret = 0; |
151 | goto end; | |
0f113f3e MC |
152 | } |
153 | ret = 1; | |
154 | } | |
4a71bee6 | 155 | |
0f113f3e | 156 | end: |
79b2a2f2 | 157 | OSSL_STACK_OF_X509_free(chain); |
d53b437f | 158 | sk_X509_free(untrusted); |
0f113f3e MC |
159 | return ret; |
160 | } | |
161 | ||
ce5886dd | 162 | int OCSP_resp_get0_signer(OCSP_BASICRESP *bs, X509 **signer, |
eb48052e | 163 | STACK_OF(X509) *extra_certs) |
ce5886dd | 164 | { |
4a71bee6 | 165 | return ocsp_find_signer(signer, bs, extra_certs, 0) > 0; |
ce5886dd BK |
166 | } |
167 | ||
0f113f3e | 168 | static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, |
a773b52a | 169 | STACK_OF(X509) *certs, unsigned long flags) |
0f113f3e MC |
170 | { |
171 | X509 *signer; | |
a332635e | 172 | OCSP_RESPID *rid = &bs->tbsResponseData.responderId; |
c51a8af8 | 173 | |
4a71bee6 | 174 | if ((signer = ocsp_find_signer_sk(certs, rid)) != NULL) { |
0f113f3e MC |
175 | *psigner = signer; |
176 | return 2; | |
177 | } | |
4a71bee6 | 178 | if ((flags & OCSP_NOINTERN) == 0 && |
0f113f3e MC |
179 | (signer = ocsp_find_signer_sk(bs->certs, rid))) { |
180 | *psigner = signer; | |
181 | return 1; | |
182 | } | |
183 | /* Maybe lookup from store if by subject name */ | |
184 | ||
185 | *psigner = NULL; | |
186 | return 0; | |
187 | } | |
9b4dc830 DSH |
188 | |
189 | static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id) | |
0f113f3e | 190 | { |
e27fea46 | 191 | int i, r; |
0f113f3e | 192 | unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash; |
e27fea46 | 193 | EVP_MD *md; |
0f113f3e MC |
194 | X509 *x; |
195 | ||
196 | /* Easy if lookup by name */ | |
197 | if (id->type == V_OCSP_RESPID_NAME) | |
198 | return X509_find_by_subject(certs, id->value.byName); | |
199 | ||
200 | /* Lookup by key hash */ | |
201 | ||
202 | /* If key hash isn't SHA1 length then forget it */ | |
203 | if (id->value.byKey->length != SHA_DIGEST_LENGTH) | |
204 | return NULL; | |
205 | keyhash = id->value.byKey->data; | |
206 | /* Calculate hash of each key and compare */ | |
207 | for (i = 0; i < sk_X509_num(certs); i++) { | |
e27fea46 P |
208 | if ((x = sk_X509_value(certs, i)) != NULL) { |
209 | if ((md = EVP_MD_fetch(x->libctx, SN_sha1, x->propq)) == NULL) | |
210 | break; | |
211 | r = X509_pubkey_digest(x, md, tmphash, NULL); | |
212 | EVP_MD_free(md); | |
213 | if (!r) | |
214 | break; | |
215 | if (memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH) == 0) | |
216 | return x; | |
217 | } | |
0f113f3e MC |
218 | } |
219 | return NULL; | |
220 | } | |
221 | ||
a773b52a | 222 | static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain) |
0f113f3e | 223 | { |
4a71bee6 | 224 | STACK_OF(OCSP_SINGLERESP) *sresp = bs->tbsResponseData.responses; |
0f113f3e MC |
225 | X509 *signer, *sca; |
226 | OCSP_CERTID *caid = NULL; | |
4a71bee6 | 227 | int ret; |
0f113f3e MC |
228 | |
229 | if (sk_X509_num(chain) <= 0) { | |
9311d0c4 | 230 | ERR_raise(ERR_LIB_OCSP, OCSP_R_NO_CERTIFICATES_IN_CHAIN); |
0f113f3e MC |
231 | return -1; |
232 | } | |
233 | ||
234 | /* See if the issuer IDs match. */ | |
4a71bee6 | 235 | ret = ocsp_check_ids(sresp, &caid); |
0f113f3e MC |
236 | |
237 | /* If ID mismatch or other error then return */ | |
4a71bee6 DDO |
238 | if (ret <= 0) |
239 | return ret; | |
0f113f3e MC |
240 | |
241 | signer = sk_X509_value(chain, 0); | |
242 | /* Check to see if OCSP responder CA matches request CA */ | |
243 | if (sk_X509_num(chain) > 1) { | |
244 | sca = sk_X509_value(chain, 1); | |
4a71bee6 DDO |
245 | ret = ocsp_match_issuerid(sca, caid, sresp); |
246 | if (ret < 0) | |
247 | return ret; | |
248 | if (ret != 0) { | |
0f113f3e | 249 | /* We have a match, if extensions OK then success */ |
a773b52a | 250 | if (ocsp_check_delegated(signer)) |
0f113f3e MC |
251 | return 1; |
252 | return 0; | |
253 | } | |
254 | } | |
255 | ||
256 | /* Otherwise check if OCSP request signed directly by request CA */ | |
257 | return ocsp_match_issuerid(signer, caid, sresp); | |
258 | } | |
259 | ||
260 | /* | |
261 | * Check the issuer certificate IDs for equality. If there is a mismatch with | |
262 | * the same algorithm then there's no point trying to match any certificates | |
263 | * against the issuer. If the issuer IDs all match then we just need to check | |
264 | * equality against one of them. | |
e8af92fc | 265 | */ |
0f113f3e | 266 | |
e8af92fc | 267 | static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret) |
0f113f3e MC |
268 | { |
269 | OCSP_CERTID *tmpid, *cid; | |
270 | int i, idcount; | |
271 | ||
272 | idcount = sk_OCSP_SINGLERESP_num(sresp); | |
273 | if (idcount <= 0) { | |
9311d0c4 | 274 | ERR_raise(ERR_LIB_OCSP, OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA); |
0f113f3e MC |
275 | return -1; |
276 | } | |
277 | ||
278 | cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId; | |
279 | ||
280 | *ret = NULL; | |
0f113f3e MC |
281 | for (i = 1; i < idcount; i++) { |
282 | tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId; | |
283 | /* Check to see if IDs match */ | |
284 | if (OCSP_id_issuer_cmp(cid, tmpid)) { | |
0d4fb843 | 285 | /* If algorithm mismatch let caller deal with it */ |
a332635e DSH |
286 | if (OBJ_cmp(tmpid->hashAlgorithm.algorithm, |
287 | cid->hashAlgorithm.algorithm)) | |
0f113f3e MC |
288 | return 2; |
289 | /* Else mismatch */ | |
290 | return 0; | |
291 | } | |
292 | } | |
e8af92fc | 293 | |
0f113f3e MC |
294 | /* All IDs match: only need to check one ID */ |
295 | *ret = cid; | |
296 | return 1; | |
297 | } | |
e8af92fc | 298 | |
c51a8af8 P |
299 | /* |
300 | * Match the certificate issuer ID. | |
4a71bee6 | 301 | * Returns -1 on fatal error, 0 if there is no match and 1 if there is a match. |
c51a8af8 | 302 | */ |
e8af92fc | 303 | static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid, |
0f113f3e MC |
304 | STACK_OF(OCSP_SINGLERESP) *sresp) |
305 | { | |
eaf8a40d TM |
306 | int ret = -1; |
307 | EVP_MD *dgst = NULL; | |
308 | ||
0f113f3e | 309 | /* If only one ID to match then do it */ |
c51a8af8 | 310 | if (cid != NULL) { |
eaf8a40d | 311 | char name[OSSL_MAX_NAME_SIZE]; |
8cc86b81 | 312 | const X509_NAME *iname; |
0f113f3e MC |
313 | int mdlen; |
314 | unsigned char md[EVP_MAX_MD_SIZE]; | |
c51a8af8 | 315 | |
eaf8a40d TM |
316 | OBJ_obj2txt(name, sizeof(name), cid->hashAlgorithm.algorithm, 0); |
317 | ||
318 | (void)ERR_set_mark(); | |
319 | dgst = EVP_MD_fetch(NULL, name, NULL); | |
320 | if (dgst == NULL) | |
321 | dgst = (EVP_MD *)EVP_get_digestbyname(name); | |
322 | ||
c51a8af8 | 323 | if (dgst == NULL) { |
eaf8a40d | 324 | (void)ERR_clear_last_mark(); |
9311d0c4 | 325 | ERR_raise(ERR_LIB_OCSP, OCSP_R_UNKNOWN_MESSAGE_DIGEST); |
eaf8a40d | 326 | goto end; |
0f113f3e | 327 | } |
eaf8a40d | 328 | (void)ERR_pop_to_mark(); |
0f113f3e | 329 | |
ed576acd | 330 | mdlen = EVP_MD_get_size(dgst); |
c51a8af8 | 331 | if (mdlen < 0) { |
9311d0c4 | 332 | ERR_raise(ERR_LIB_OCSP, OCSP_R_DIGEST_SIZE_ERR); |
eaf8a40d | 333 | goto end; |
c51a8af8 P |
334 | } |
335 | if (cid->issuerNameHash.length != mdlen || | |
eaf8a40d TM |
336 | cid->issuerKeyHash.length != mdlen) { |
337 | ret = 0; | |
338 | goto end; | |
339 | } | |
0f113f3e | 340 | iname = X509_get_subject_name(cert); |
eaf8a40d TM |
341 | if (!X509_NAME_digest(iname, dgst, md, NULL)) |
342 | goto end; | |
343 | if (memcmp(md, cid->issuerNameHash.data, mdlen) != 0) { | |
344 | ret = 0; | |
345 | goto end; | |
c51a8af8 | 346 | } |
c51a8af8 | 347 | if (!X509_pubkey_digest(cert, dgst, md, NULL)) { |
9311d0c4 | 348 | ERR_raise(ERR_LIB_OCSP, OCSP_R_DIGEST_ERR); |
eaf8a40d | 349 | goto end; |
c51a8af8 | 350 | } |
eaf8a40d TM |
351 | ret = memcmp(md, cid->issuerKeyHash.data, mdlen) == 0; |
352 | goto end; | |
0f113f3e MC |
353 | } else { |
354 | /* We have to match the whole lot */ | |
eaf8a40d | 355 | int i; |
0f113f3e | 356 | OCSP_CERTID *tmpid; |
c51a8af8 | 357 | |
0f113f3e MC |
358 | for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++) { |
359 | tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId; | |
360 | ret = ocsp_match_issuerid(cert, tmpid, NULL); | |
361 | if (ret <= 0) | |
362 | return ret; | |
363 | } | |
0f113f3e | 364 | } |
c51a8af8 | 365 | return 1; |
eaf8a40d TM |
366 | end: |
367 | EVP_MD_free(dgst); | |
368 | return ret; | |
0f113f3e | 369 | } |
e8af92fc | 370 | |
a773b52a | 371 | static int ocsp_check_delegated(X509 *x) |
0f113f3e | 372 | { |
a8d8e06b DSH |
373 | if ((X509_get_extension_flags(x) & EXFLAG_XKUSAGE) |
374 | && (X509_get_extended_key_usage(x) & XKU_OCSP_SIGN)) | |
0f113f3e | 375 | return 1; |
9311d0c4 | 376 | ERR_raise(ERR_LIB_OCSP, OCSP_R_MISSING_OCSPSIGNING_USAGE); |
0f113f3e MC |
377 | return 0; |
378 | } | |
379 | ||
380 | /* | |
4a71bee6 DDO |
381 | * Verify an OCSP request. This is much easier than OCSP response verify. |
382 | * Just find the signer's certificate and verify it against a given trust value. | |
383 | * Returns 1 on success, 0 on failure and on fatal error. | |
fafc7f98 | 384 | */ |
0f113f3e MC |
385 | int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs, |
386 | X509_STORE *store, unsigned long flags) | |
387 | { | |
388 | X509 *signer; | |
8cc86b81 | 389 | const X509_NAME *nm; |
0f113f3e | 390 | GENERAL_NAME *gen; |
4a71bee6 | 391 | int ret; |
f0e0fd51 | 392 | |
0f113f3e | 393 | if (!req->optionalSignature) { |
9311d0c4 | 394 | ERR_raise(ERR_LIB_OCSP, OCSP_R_REQUEST_NOT_SIGNED); |
4a71bee6 | 395 | return 0; |
0f113f3e | 396 | } |
a332635e | 397 | gen = req->tbsRequest.requestorName; |
0f113f3e | 398 | if (!gen || gen->type != GEN_DIRNAME) { |
9311d0c4 | 399 | ERR_raise(ERR_LIB_OCSP, OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE); |
4a71bee6 | 400 | return 0; /* not returning -1 here for backward compatibility*/ |
0f113f3e MC |
401 | } |
402 | nm = gen->d.directoryName; | |
a773b52a | 403 | ret = ocsp_req_find_signer(&signer, req, nm, certs, flags); |
0f113f3e | 404 | if (ret <= 0) { |
9311d0c4 | 405 | ERR_raise(ERR_LIB_OCSP, OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND); |
4a71bee6 | 406 | return 0; /* not returning -1 here for backward compatibility*/ |
0f113f3e | 407 | } |
4a71bee6 | 408 | if ((ret == 2) && (flags & OCSP_TRUSTOTHER) != 0) |
0f113f3e | 409 | flags |= OCSP_NOVERIFY; |
f0e0fd51 | 410 | |
4a71bee6 DDO |
411 | if ((ret = ocsp_verify(req, NULL, signer, flags)) <= 0) |
412 | return 0; /* not returning 'ret' here for backward compatibility*/ | |
413 | if ((flags & OCSP_NOVERIFY) != 0) | |
414 | return 1; | |
4ff993d7 | 415 | return ocsp_verify_signer(signer, 0, store, flags, |
4a71bee6 DDO |
416 | (flags & OCSP_NOCHAIN) != 0 ? |
417 | NULL : req->optionalSignature->certs, NULL) > 0; | |
418 | /* using '> 0' here to avoid breaking backward compatibility returning -1 */ | |
0f113f3e MC |
419 | } |
420 | ||
421 | static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, | |
8cc86b81 | 422 | const X509_NAME *nm, STACK_OF(X509) *certs, |
a773b52a | 423 | unsigned long flags) |
0f113f3e MC |
424 | { |
425 | X509 *signer; | |
c51a8af8 | 426 | |
4a71bee6 | 427 | if ((flags & OCSP_NOINTERN) == 0) { |
0f113f3e | 428 | signer = X509_find_by_subject(req->optionalSignature->certs, nm); |
4a71bee6 | 429 | if (signer != NULL) { |
0f113f3e MC |
430 | *psigner = signer; |
431 | return 1; | |
432 | } | |
433 | } | |
434 | ||
4a71bee6 | 435 | if ((signer = X509_find_by_subject(certs, nm)) != NULL) { |
0f113f3e MC |
436 | *psigner = signer; |
437 | return 2; | |
438 | } | |
439 | return 0; | |
440 | } |