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9b4dc830 | 1 | /* ocsp_vfy.c */ |
0f113f3e MC |
2 | /* |
3 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project | |
4 | * 2000. | |
9b4dc830 DSH |
5 | */ |
6 | /* ==================================================================== | |
91180d45 | 7 | * Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved. |
9b4dc830 DSH |
8 | * |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 14 | * notice, this list of conditions and the following disclaimer. |
9b4dc830 DSH |
15 | * |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
17 | * notice, this list of conditions and the following disclaimer in | |
18 | * the documentation and/or other materials provided with the | |
19 | * distribution. | |
20 | * | |
21 | * 3. All advertising materials mentioning features or use of this | |
22 | * software must display the following acknowledgment: | |
23 | * "This product includes software developed by the OpenSSL Project | |
24 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
25 | * | |
26 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
27 | * endorse or promote products derived from this software without | |
28 | * prior written permission. For written permission, please contact | |
29 | * licensing@OpenSSL.org. | |
30 | * | |
31 | * 5. Products derived from this software may not be called "OpenSSL" | |
32 | * nor may "OpenSSL" appear in their names without prior written | |
33 | * permission of the OpenSSL Project. | |
34 | * | |
35 | * 6. Redistributions of any form whatsoever must retain the following | |
36 | * acknowledgment: | |
37 | * "This product includes software developed by the OpenSSL Project | |
38 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
41 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
43 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
44 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
45 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
47 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
49 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
50 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
51 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
52 | * ==================================================================== | |
53 | * | |
54 | * This product includes cryptographic software written by Eric Young | |
55 | * (eay@cryptsoft.com). This product includes software written by Tim | |
56 | * Hudson (tjh@cryptsoft.com). | |
57 | * | |
58 | */ | |
59 | ||
60 | #include <openssl/ocsp.h> | |
6ef869d7 | 61 | #include "ocsp_lcl.h" |
9b4dc830 | 62 | #include <openssl/err.h> |
3ebac273 | 63 | #include <string.h> |
9b4dc830 | 64 | |
0f113f3e MC |
65 | static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, |
66 | STACK_OF(X509) *certs, X509_STORE *st, | |
67 | unsigned long flags); | |
9b4dc830 | 68 | static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id); |
0f113f3e MC |
69 | static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain, |
70 | unsigned long flags); | |
71 | static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, | |
72 | OCSP_CERTID **ret); | |
73 | static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid, | |
74 | STACK_OF(OCSP_SINGLERESP) *sresp); | |
e8af92fc | 75 | static int ocsp_check_delegated(X509 *x, int flags); |
0f113f3e MC |
76 | static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, |
77 | X509_NAME *nm, STACK_OF(X509) *certs, | |
78 | X509_STORE *st, unsigned long flags); | |
9b4dc830 DSH |
79 | |
80 | /* Verify a basic response message */ | |
81 | ||
82 | int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs, | |
0f113f3e MC |
83 | X509_STORE *st, unsigned long flags) |
84 | { | |
85 | X509 *signer, *x; | |
86 | STACK_OF(X509) *chain = NULL; | |
87 | X509_STORE_CTX ctx; | |
88 | int i, ret = 0; | |
89 | ret = ocsp_find_signer(&signer, bs, certs, st, flags); | |
90 | if (!ret) { | |
91 | OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, | |
92 | OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND); | |
93 | goto end; | |
94 | } | |
95 | if ((ret == 2) && (flags & OCSP_TRUSTOTHER)) | |
96 | flags |= OCSP_NOVERIFY; | |
97 | if (!(flags & OCSP_NOSIGS)) { | |
98 | EVP_PKEY *skey; | |
99 | skey = X509_get_pubkey(signer); | |
100 | if (skey) { | |
101 | ret = OCSP_BASICRESP_verify(bs, skey, 0); | |
102 | EVP_PKEY_free(skey); | |
103 | } | |
104 | if (!skey || ret <= 0) { | |
105 | OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNATURE_FAILURE); | |
106 | goto end; | |
107 | } | |
108 | } | |
109 | if (!(flags & OCSP_NOVERIFY)) { | |
110 | int init_res; | |
111 | if (flags & OCSP_NOCHAIN) | |
112 | init_res = X509_STORE_CTX_init(&ctx, st, signer, NULL); | |
113 | else | |
114 | init_res = X509_STORE_CTX_init(&ctx, st, signer, bs->certs); | |
115 | if (!init_res) { | |
116 | ret = -1; | |
117 | OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_X509_LIB); | |
118 | goto end; | |
119 | } | |
9b4dc830 | 120 | |
0f113f3e MC |
121 | X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER); |
122 | ret = X509_verify_cert(&ctx); | |
123 | chain = X509_STORE_CTX_get1_chain(&ctx); | |
124 | X509_STORE_CTX_cleanup(&ctx); | |
125 | if (ret <= 0) { | |
126 | i = X509_STORE_CTX_get_error(&ctx); | |
127 | OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, | |
128 | OCSP_R_CERTIFICATE_VERIFY_ERROR); | |
129 | ERR_add_error_data(2, "Verify error:", | |
130 | X509_verify_cert_error_string(i)); | |
131 | goto end; | |
132 | } | |
133 | if (flags & OCSP_NOCHECKS) { | |
134 | ret = 1; | |
135 | goto end; | |
136 | } | |
137 | /* | |
138 | * At this point we have a valid certificate chain need to verify it | |
139 | * against the OCSP issuer criteria. | |
140 | */ | |
141 | ret = ocsp_check_issuer(bs, chain, flags); | |
142 | ||
143 | /* If fatal error or valid match then finish */ | |
144 | if (ret != 0) | |
145 | goto end; | |
146 | ||
147 | /* | |
148 | * Easy case: explicitly trusted. Get root CA and check for explicit | |
149 | * trust | |
150 | */ | |
151 | if (flags & OCSP_NOEXPLICIT) | |
152 | goto end; | |
153 | ||
154 | x = sk_X509_value(chain, sk_X509_num(chain) - 1); | |
155 | if (X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED) { | |
156 | OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_ROOT_CA_NOT_TRUSTED); | |
157 | goto end; | |
158 | } | |
159 | ret = 1; | |
160 | } | |
161 | ||
162 | end: | |
163 | if (chain) | |
164 | sk_X509_pop_free(chain, X509_free); | |
165 | return ret; | |
166 | } | |
167 | ||
168 | static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, | |
169 | STACK_OF(X509) *certs, X509_STORE *st, | |
170 | unsigned long flags) | |
171 | { | |
172 | X509 *signer; | |
173 | OCSP_RESPID *rid = bs->tbsResponseData->responderId; | |
174 | if ((signer = ocsp_find_signer_sk(certs, rid))) { | |
175 | *psigner = signer; | |
176 | return 2; | |
177 | } | |
178 | if (!(flags & OCSP_NOINTERN) && | |
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 MC |
190 | { |
191 | int i; | |
192 | unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash; | |
193 | X509 *x; | |
194 | ||
195 | /* Easy if lookup by name */ | |
196 | if (id->type == V_OCSP_RESPID_NAME) | |
197 | return X509_find_by_subject(certs, id->value.byName); | |
198 | ||
199 | /* Lookup by key hash */ | |
200 | ||
201 | /* If key hash isn't SHA1 length then forget it */ | |
202 | if (id->value.byKey->length != SHA_DIGEST_LENGTH) | |
203 | return NULL; | |
204 | keyhash = id->value.byKey->data; | |
205 | /* Calculate hash of each key and compare */ | |
206 | for (i = 0; i < sk_X509_num(certs); i++) { | |
207 | x = sk_X509_value(certs, i); | |
208 | X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL); | |
209 | if (!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH)) | |
210 | return x; | |
211 | } | |
212 | return NULL; | |
213 | } | |
214 | ||
215 | static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain, | |
216 | unsigned long flags) | |
217 | { | |
218 | STACK_OF(OCSP_SINGLERESP) *sresp; | |
219 | X509 *signer, *sca; | |
220 | OCSP_CERTID *caid = NULL; | |
221 | int i; | |
222 | sresp = bs->tbsResponseData->responses; | |
223 | ||
224 | if (sk_X509_num(chain) <= 0) { | |
225 | OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN); | |
226 | return -1; | |
227 | } | |
228 | ||
229 | /* See if the issuer IDs match. */ | |
230 | i = ocsp_check_ids(sresp, &caid); | |
231 | ||
232 | /* If ID mismatch or other error then return */ | |
233 | if (i <= 0) | |
234 | return i; | |
235 | ||
236 | signer = sk_X509_value(chain, 0); | |
237 | /* Check to see if OCSP responder CA matches request CA */ | |
238 | if (sk_X509_num(chain) > 1) { | |
239 | sca = sk_X509_value(chain, 1); | |
240 | i = ocsp_match_issuerid(sca, caid, sresp); | |
241 | if (i < 0) | |
242 | return i; | |
243 | if (i) { | |
244 | /* We have a match, if extensions OK then success */ | |
245 | if (ocsp_check_delegated(signer, flags)) | |
246 | return 1; | |
247 | return 0; | |
248 | } | |
249 | } | |
250 | ||
251 | /* Otherwise check if OCSP request signed directly by request CA */ | |
252 | return ocsp_match_issuerid(signer, caid, sresp); | |
253 | } | |
254 | ||
255 | /* | |
256 | * Check the issuer certificate IDs for equality. If there is a mismatch with | |
257 | * the same algorithm then there's no point trying to match any certificates | |
258 | * against the issuer. If the issuer IDs all match then we just need to check | |
259 | * equality against one of them. | |
e8af92fc | 260 | */ |
0f113f3e | 261 | |
e8af92fc | 262 | static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret) |
0f113f3e MC |
263 | { |
264 | OCSP_CERTID *tmpid, *cid; | |
265 | int i, idcount; | |
266 | ||
267 | idcount = sk_OCSP_SINGLERESP_num(sresp); | |
268 | if (idcount <= 0) { | |
269 | OCSPerr(OCSP_F_OCSP_CHECK_IDS, | |
270 | OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA); | |
271 | return -1; | |
272 | } | |
273 | ||
274 | cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId; | |
275 | ||
276 | *ret = NULL; | |
277 | ||
278 | for (i = 1; i < idcount; i++) { | |
279 | tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId; | |
280 | /* Check to see if IDs match */ | |
281 | if (OCSP_id_issuer_cmp(cid, tmpid)) { | |
282 | /* If algoritm mismatch let caller deal with it */ | |
283 | if (OBJ_cmp(tmpid->hashAlgorithm->algorithm, | |
284 | cid->hashAlgorithm->algorithm)) | |
285 | return 2; | |
286 | /* Else mismatch */ | |
287 | return 0; | |
288 | } | |
289 | } | |
e8af92fc | 290 | |
0f113f3e MC |
291 | /* All IDs match: only need to check one ID */ |
292 | *ret = cid; | |
293 | return 1; | |
294 | } | |
e8af92fc DSH |
295 | |
296 | static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid, | |
0f113f3e MC |
297 | STACK_OF(OCSP_SINGLERESP) *sresp) |
298 | { | |
299 | /* If only one ID to match then do it */ | |
300 | if (cid) { | |
301 | const EVP_MD *dgst; | |
302 | X509_NAME *iname; | |
303 | int mdlen; | |
304 | unsigned char md[EVP_MAX_MD_SIZE]; | |
305 | if (!(dgst = EVP_get_digestbyobj(cid->hashAlgorithm->algorithm))) { | |
306 | OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID, | |
307 | OCSP_R_UNKNOWN_MESSAGE_DIGEST); | |
308 | return -1; | |
309 | } | |
310 | ||
311 | mdlen = EVP_MD_size(dgst); | |
312 | if (mdlen < 0) | |
313 | return -1; | |
314 | if ((cid->issuerNameHash->length != mdlen) || | |
315 | (cid->issuerKeyHash->length != mdlen)) | |
316 | return 0; | |
317 | iname = X509_get_subject_name(cert); | |
318 | if (!X509_NAME_digest(iname, dgst, md, NULL)) | |
319 | return -1; | |
320 | if (memcmp(md, cid->issuerNameHash->data, mdlen)) | |
321 | return 0; | |
322 | X509_pubkey_digest(cert, dgst, md, NULL); | |
323 | if (memcmp(md, cid->issuerKeyHash->data, mdlen)) | |
324 | return 0; | |
325 | ||
326 | return 1; | |
327 | ||
328 | } else { | |
329 | /* We have to match the whole lot */ | |
330 | int i, ret; | |
331 | OCSP_CERTID *tmpid; | |
332 | for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++) { | |
333 | tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId; | |
334 | ret = ocsp_match_issuerid(cert, tmpid, NULL); | |
335 | if (ret <= 0) | |
336 | return ret; | |
337 | } | |
338 | return 1; | |
339 | } | |
340 | ||
341 | } | |
e8af92fc DSH |
342 | |
343 | static int ocsp_check_delegated(X509 *x, int flags) | |
0f113f3e MC |
344 | { |
345 | X509_check_purpose(x, -1, 0); | |
346 | if ((x->ex_flags & EXFLAG_XKUSAGE) && (x->ex_xkusage & XKU_OCSP_SIGN)) | |
347 | return 1; | |
348 | OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE); | |
349 | return 0; | |
350 | } | |
351 | ||
352 | /* | |
353 | * Verify an OCSP request. This is fortunately much easier than OCSP response | |
354 | * verify. Just find the signers certificate and verify it against a given | |
355 | * trust value. | |
fafc7f98 DSH |
356 | */ |
357 | ||
0f113f3e MC |
358 | int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs, |
359 | X509_STORE *store, unsigned long flags) | |
360 | { | |
361 | X509 *signer; | |
362 | X509_NAME *nm; | |
363 | GENERAL_NAME *gen; | |
364 | int ret; | |
365 | X509_STORE_CTX ctx; | |
366 | if (!req->optionalSignature) { | |
367 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED); | |
368 | return 0; | |
369 | } | |
370 | gen = req->tbsRequest->requestorName; | |
371 | if (!gen || gen->type != GEN_DIRNAME) { | |
372 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, | |
373 | OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE); | |
374 | return 0; | |
375 | } | |
376 | nm = gen->d.directoryName; | |
377 | ret = ocsp_req_find_signer(&signer, req, nm, certs, store, flags); | |
378 | if (ret <= 0) { | |
379 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, | |
380 | OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND); | |
381 | return 0; | |
382 | } | |
383 | if ((ret == 2) && (flags & OCSP_TRUSTOTHER)) | |
384 | flags |= OCSP_NOVERIFY; | |
385 | if (!(flags & OCSP_NOSIGS)) { | |
386 | EVP_PKEY *skey; | |
387 | skey = X509_get_pubkey(signer); | |
388 | ret = OCSP_REQUEST_verify(req, skey); | |
389 | EVP_PKEY_free(skey); | |
390 | if (ret <= 0) { | |
391 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE); | |
392 | return 0; | |
393 | } | |
394 | } | |
395 | if (!(flags & OCSP_NOVERIFY)) { | |
396 | int init_res; | |
397 | if (flags & OCSP_NOCHAIN) | |
398 | init_res = X509_STORE_CTX_init(&ctx, store, signer, NULL); | |
399 | else | |
400 | init_res = X509_STORE_CTX_init(&ctx, store, signer, | |
401 | req->optionalSignature->certs); | |
402 | if (!init_res) { | |
403 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_X509_LIB); | |
404 | return 0; | |
fafc7f98 DSH |
405 | } |
406 | ||
0f113f3e MC |
407 | X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER); |
408 | X509_STORE_CTX_set_trust(&ctx, X509_TRUST_OCSP_REQUEST); | |
409 | ret = X509_verify_cert(&ctx); | |
410 | X509_STORE_CTX_cleanup(&ctx); | |
411 | if (ret <= 0) { | |
412 | ret = X509_STORE_CTX_get_error(&ctx); | |
413 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, | |
414 | OCSP_R_CERTIFICATE_VERIFY_ERROR); | |
415 | ERR_add_error_data(2, "Verify error:", | |
416 | X509_verify_cert_error_string(ret)); | |
417 | return 0; | |
418 | } | |
419 | } | |
420 | return 1; | |
421 | } | |
422 | ||
423 | static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, | |
424 | X509_NAME *nm, STACK_OF(X509) *certs, | |
425 | X509_STORE *st, unsigned long flags) | |
426 | { | |
427 | X509 *signer; | |
428 | if (!(flags & OCSP_NOINTERN)) { | |
429 | signer = X509_find_by_subject(req->optionalSignature->certs, nm); | |
430 | if (signer) { | |
431 | *psigner = signer; | |
432 | return 1; | |
433 | } | |
434 | } | |
435 | ||
436 | signer = X509_find_by_subject(certs, nm); | |
437 | if (signer) { | |
438 | *psigner = signer; | |
439 | return 2; | |
440 | } | |
441 | return 0; | |
442 | } |