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0f113f3e MC |
1 | /* |
2 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project | |
3 | * 2000. | |
9b4dc830 DSH |
4 | */ |
5 | /* ==================================================================== | |
91180d45 | 6 | * Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved. |
9b4dc830 DSH |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 13 | * notice, this list of conditions and the following disclaimer. |
9b4dc830 DSH |
14 | * |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * licensing@OpenSSL.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | * | |
53 | * This product includes cryptographic software written by Eric Young | |
54 | * (eay@cryptsoft.com). This product includes software written by Tim | |
55 | * Hudson (tjh@cryptsoft.com). | |
56 | * | |
57 | */ | |
58 | ||
59 | #include <openssl/ocsp.h> | |
6ef869d7 | 60 | #include "ocsp_lcl.h" |
9b4dc830 | 61 | #include <openssl/err.h> |
3ebac273 | 62 | #include <string.h> |
9b4dc830 | 63 | |
0f113f3e MC |
64 | static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, |
65 | STACK_OF(X509) *certs, X509_STORE *st, | |
66 | unsigned long flags); | |
9b4dc830 | 67 | static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id); |
0f113f3e MC |
68 | static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain, |
69 | unsigned long flags); | |
70 | static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, | |
71 | OCSP_CERTID **ret); | |
72 | static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid, | |
73 | STACK_OF(OCSP_SINGLERESP) *sresp); | |
e8af92fc | 74 | static int ocsp_check_delegated(X509 *x, int flags); |
0f113f3e MC |
75 | static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, |
76 | X509_NAME *nm, STACK_OF(X509) *certs, | |
77 | X509_STORE *st, unsigned long flags); | |
9b4dc830 DSH |
78 | |
79 | /* Verify a basic response message */ | |
80 | ||
81 | int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs, | |
0f113f3e MC |
82 | X509_STORE *st, unsigned long flags) |
83 | { | |
84 | X509 *signer, *x; | |
85 | STACK_OF(X509) *chain = NULL; | |
4ca5efc2 | 86 | STACK_OF(X509) *untrusted = NULL; |
0f113f3e MC |
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; | |
8382fd3a DSH |
99 | skey = X509_get0_pubkey(signer); |
100 | if (skey) | |
0f113f3e | 101 | ret = OCSP_BASICRESP_verify(bs, skey, 0); |
0f113f3e MC |
102 | if (!skey || ret <= 0) { |
103 | OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNATURE_FAILURE); | |
104 | goto end; | |
105 | } | |
106 | } | |
107 | if (!(flags & OCSP_NOVERIFY)) { | |
108 | int init_res; | |
4ca5efc2 DSH |
109 | if (flags & OCSP_NOCHAIN) { |
110 | untrusted = NULL; | |
111 | } else if (bs->certs && certs) { | |
112 | untrusted = sk_X509_dup(bs->certs); | |
113 | for (i = 0; i < sk_X509_num(certs); i++) { | |
114 | if (!sk_X509_push(untrusted, sk_X509_value(certs, i))) { | |
115 | OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_MALLOC_FAILURE); | |
116 | goto end; | |
117 | } | |
118 | } | |
119 | } else { | |
120 | untrusted = bs->certs; | |
121 | } | |
122 | init_res = X509_STORE_CTX_init(&ctx, st, signer, untrusted); | |
0f113f3e MC |
123 | if (!init_res) { |
124 | ret = -1; | |
125 | OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_X509_LIB); | |
126 | goto end; | |
127 | } | |
9b4dc830 | 128 | |
0f113f3e MC |
129 | X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER); |
130 | ret = X509_verify_cert(&ctx); | |
131 | chain = X509_STORE_CTX_get1_chain(&ctx); | |
132 | X509_STORE_CTX_cleanup(&ctx); | |
133 | if (ret <= 0) { | |
134 | i = X509_STORE_CTX_get_error(&ctx); | |
135 | OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, | |
136 | OCSP_R_CERTIFICATE_VERIFY_ERROR); | |
137 | ERR_add_error_data(2, "Verify error:", | |
138 | X509_verify_cert_error_string(i)); | |
139 | goto end; | |
140 | } | |
141 | if (flags & OCSP_NOCHECKS) { | |
142 | ret = 1; | |
143 | goto end; | |
144 | } | |
145 | /* | |
146 | * At this point we have a valid certificate chain need to verify it | |
147 | * against the OCSP issuer criteria. | |
148 | */ | |
149 | ret = ocsp_check_issuer(bs, chain, flags); | |
150 | ||
151 | /* If fatal error or valid match then finish */ | |
152 | if (ret != 0) | |
153 | goto end; | |
154 | ||
155 | /* | |
156 | * Easy case: explicitly trusted. Get root CA and check for explicit | |
157 | * trust | |
158 | */ | |
159 | if (flags & OCSP_NOEXPLICIT) | |
160 | goto end; | |
161 | ||
162 | x = sk_X509_value(chain, sk_X509_num(chain) - 1); | |
163 | if (X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED) { | |
164 | OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_ROOT_CA_NOT_TRUSTED); | |
165 | goto end; | |
166 | } | |
167 | ret = 1; | |
168 | } | |
169 | ||
170 | end: | |
222561fe | 171 | sk_X509_pop_free(chain, X509_free); |
4ca5efc2 DSH |
172 | if (bs->certs && certs) |
173 | sk_X509_free(untrusted); | |
0f113f3e MC |
174 | return ret; |
175 | } | |
176 | ||
177 | static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, | |
178 | STACK_OF(X509) *certs, X509_STORE *st, | |
179 | unsigned long flags) | |
180 | { | |
181 | X509 *signer; | |
a332635e | 182 | OCSP_RESPID *rid = &bs->tbsResponseData.responderId; |
0f113f3e MC |
183 | if ((signer = ocsp_find_signer_sk(certs, rid))) { |
184 | *psigner = signer; | |
185 | return 2; | |
186 | } | |
187 | if (!(flags & OCSP_NOINTERN) && | |
188 | (signer = ocsp_find_signer_sk(bs->certs, rid))) { | |
189 | *psigner = signer; | |
190 | return 1; | |
191 | } | |
192 | /* Maybe lookup from store if by subject name */ | |
193 | ||
194 | *psigner = NULL; | |
195 | return 0; | |
196 | } | |
9b4dc830 DSH |
197 | |
198 | static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id) | |
0f113f3e MC |
199 | { |
200 | int i; | |
201 | unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash; | |
202 | X509 *x; | |
203 | ||
204 | /* Easy if lookup by name */ | |
205 | if (id->type == V_OCSP_RESPID_NAME) | |
206 | return X509_find_by_subject(certs, id->value.byName); | |
207 | ||
208 | /* Lookup by key hash */ | |
209 | ||
210 | /* If key hash isn't SHA1 length then forget it */ | |
211 | if (id->value.byKey->length != SHA_DIGEST_LENGTH) | |
212 | return NULL; | |
213 | keyhash = id->value.byKey->data; | |
214 | /* Calculate hash of each key and compare */ | |
215 | for (i = 0; i < sk_X509_num(certs); i++) { | |
216 | x = sk_X509_value(certs, i); | |
217 | X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL); | |
218 | if (!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH)) | |
219 | return x; | |
220 | } | |
221 | return NULL; | |
222 | } | |
223 | ||
224 | static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain, | |
225 | unsigned long flags) | |
226 | { | |
227 | STACK_OF(OCSP_SINGLERESP) *sresp; | |
228 | X509 *signer, *sca; | |
229 | OCSP_CERTID *caid = NULL; | |
230 | int i; | |
a332635e | 231 | sresp = bs->tbsResponseData.responses; |
0f113f3e MC |
232 | |
233 | if (sk_X509_num(chain) <= 0) { | |
234 | OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN); | |
235 | return -1; | |
236 | } | |
237 | ||
238 | /* See if the issuer IDs match. */ | |
239 | i = ocsp_check_ids(sresp, &caid); | |
240 | ||
241 | /* If ID mismatch or other error then return */ | |
242 | if (i <= 0) | |
243 | return i; | |
244 | ||
245 | signer = sk_X509_value(chain, 0); | |
246 | /* Check to see if OCSP responder CA matches request CA */ | |
247 | if (sk_X509_num(chain) > 1) { | |
248 | sca = sk_X509_value(chain, 1); | |
249 | i = ocsp_match_issuerid(sca, caid, sresp); | |
250 | if (i < 0) | |
251 | return i; | |
252 | if (i) { | |
253 | /* We have a match, if extensions OK then success */ | |
254 | if (ocsp_check_delegated(signer, flags)) | |
255 | return 1; | |
256 | return 0; | |
257 | } | |
258 | } | |
259 | ||
260 | /* Otherwise check if OCSP request signed directly by request CA */ | |
261 | return ocsp_match_issuerid(signer, caid, sresp); | |
262 | } | |
263 | ||
264 | /* | |
265 | * Check the issuer certificate IDs for equality. If there is a mismatch with | |
266 | * the same algorithm then there's no point trying to match any certificates | |
267 | * against the issuer. If the issuer IDs all match then we just need to check | |
268 | * equality against one of them. | |
e8af92fc | 269 | */ |
0f113f3e | 270 | |
e8af92fc | 271 | static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret) |
0f113f3e MC |
272 | { |
273 | OCSP_CERTID *tmpid, *cid; | |
274 | int i, idcount; | |
275 | ||
276 | idcount = sk_OCSP_SINGLERESP_num(sresp); | |
277 | if (idcount <= 0) { | |
278 | OCSPerr(OCSP_F_OCSP_CHECK_IDS, | |
279 | OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA); | |
280 | return -1; | |
281 | } | |
282 | ||
283 | cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId; | |
284 | ||
285 | *ret = NULL; | |
286 | ||
287 | for (i = 1; i < idcount; i++) { | |
288 | tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId; | |
289 | /* Check to see if IDs match */ | |
290 | if (OCSP_id_issuer_cmp(cid, tmpid)) { | |
291 | /* If algoritm mismatch let caller deal with it */ | |
a332635e DSH |
292 | if (OBJ_cmp(tmpid->hashAlgorithm.algorithm, |
293 | cid->hashAlgorithm.algorithm)) | |
0f113f3e MC |
294 | return 2; |
295 | /* Else mismatch */ | |
296 | return 0; | |
297 | } | |
298 | } | |
e8af92fc | 299 | |
0f113f3e MC |
300 | /* All IDs match: only need to check one ID */ |
301 | *ret = cid; | |
302 | return 1; | |
303 | } | |
e8af92fc DSH |
304 | |
305 | static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid, | |
0f113f3e MC |
306 | STACK_OF(OCSP_SINGLERESP) *sresp) |
307 | { | |
308 | /* If only one ID to match then do it */ | |
309 | if (cid) { | |
310 | const EVP_MD *dgst; | |
311 | X509_NAME *iname; | |
312 | int mdlen; | |
313 | unsigned char md[EVP_MAX_MD_SIZE]; | |
a332635e | 314 | if ((dgst = EVP_get_digestbyobj(cid->hashAlgorithm.algorithm)) |
75ebbd9a | 315 | == NULL) { |
0f113f3e MC |
316 | OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID, |
317 | OCSP_R_UNKNOWN_MESSAGE_DIGEST); | |
318 | return -1; | |
319 | } | |
320 | ||
321 | mdlen = EVP_MD_size(dgst); | |
322 | if (mdlen < 0) | |
323 | return -1; | |
af170194 DSH |
324 | if ((cid->issuerNameHash.length != mdlen) || |
325 | (cid->issuerKeyHash.length != mdlen)) | |
0f113f3e MC |
326 | return 0; |
327 | iname = X509_get_subject_name(cert); | |
328 | if (!X509_NAME_digest(iname, dgst, md, NULL)) | |
329 | return -1; | |
af170194 | 330 | if (memcmp(md, cid->issuerNameHash.data, mdlen)) |
0f113f3e MC |
331 | return 0; |
332 | X509_pubkey_digest(cert, dgst, md, NULL); | |
af170194 | 333 | if (memcmp(md, cid->issuerKeyHash.data, mdlen)) |
0f113f3e MC |
334 | return 0; |
335 | ||
336 | return 1; | |
337 | ||
338 | } else { | |
339 | /* We have to match the whole lot */ | |
340 | int i, ret; | |
341 | OCSP_CERTID *tmpid; | |
342 | for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++) { | |
343 | tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId; | |
344 | ret = ocsp_match_issuerid(cert, tmpid, NULL); | |
345 | if (ret <= 0) | |
346 | return ret; | |
347 | } | |
348 | return 1; | |
349 | } | |
350 | ||
351 | } | |
e8af92fc DSH |
352 | |
353 | static int ocsp_check_delegated(X509 *x, int flags) | |
0f113f3e | 354 | { |
a8d8e06b DSH |
355 | if ((X509_get_extension_flags(x) & EXFLAG_XKUSAGE) |
356 | && (X509_get_extended_key_usage(x) & XKU_OCSP_SIGN)) | |
0f113f3e MC |
357 | return 1; |
358 | OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | /* | |
363 | * Verify an OCSP request. This is fortunately much easier than OCSP response | |
364 | * verify. Just find the signers certificate and verify it against a given | |
365 | * trust value. | |
fafc7f98 DSH |
366 | */ |
367 | ||
0f113f3e MC |
368 | int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs, |
369 | X509_STORE *store, unsigned long flags) | |
370 | { | |
371 | X509 *signer; | |
372 | X509_NAME *nm; | |
373 | GENERAL_NAME *gen; | |
374 | int ret; | |
375 | X509_STORE_CTX ctx; | |
376 | if (!req->optionalSignature) { | |
377 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED); | |
378 | return 0; | |
379 | } | |
a332635e | 380 | gen = req->tbsRequest.requestorName; |
0f113f3e MC |
381 | if (!gen || gen->type != GEN_DIRNAME) { |
382 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, | |
383 | OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE); | |
384 | return 0; | |
385 | } | |
386 | nm = gen->d.directoryName; | |
387 | ret = ocsp_req_find_signer(&signer, req, nm, certs, store, flags); | |
388 | if (ret <= 0) { | |
389 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, | |
390 | OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND); | |
391 | return 0; | |
392 | } | |
393 | if ((ret == 2) && (flags & OCSP_TRUSTOTHER)) | |
394 | flags |= OCSP_NOVERIFY; | |
395 | if (!(flags & OCSP_NOSIGS)) { | |
396 | EVP_PKEY *skey; | |
8382fd3a | 397 | skey = X509_get0_pubkey(signer); |
0f113f3e | 398 | ret = OCSP_REQUEST_verify(req, skey); |
0f113f3e MC |
399 | if (ret <= 0) { |
400 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE); | |
401 | return 0; | |
402 | } | |
403 | } | |
404 | if (!(flags & OCSP_NOVERIFY)) { | |
405 | int init_res; | |
406 | if (flags & OCSP_NOCHAIN) | |
407 | init_res = X509_STORE_CTX_init(&ctx, store, signer, NULL); | |
408 | else | |
409 | init_res = X509_STORE_CTX_init(&ctx, store, signer, | |
410 | req->optionalSignature->certs); | |
411 | if (!init_res) { | |
412 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_X509_LIB); | |
413 | return 0; | |
fafc7f98 DSH |
414 | } |
415 | ||
0f113f3e MC |
416 | X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER); |
417 | X509_STORE_CTX_set_trust(&ctx, X509_TRUST_OCSP_REQUEST); | |
418 | ret = X509_verify_cert(&ctx); | |
419 | X509_STORE_CTX_cleanup(&ctx); | |
420 | if (ret <= 0) { | |
421 | ret = X509_STORE_CTX_get_error(&ctx); | |
422 | OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, | |
423 | OCSP_R_CERTIFICATE_VERIFY_ERROR); | |
424 | ERR_add_error_data(2, "Verify error:", | |
425 | X509_verify_cert_error_string(ret)); | |
426 | return 0; | |
427 | } | |
428 | } | |
429 | return 1; | |
430 | } | |
431 | ||
432 | static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, | |
433 | X509_NAME *nm, STACK_OF(X509) *certs, | |
434 | X509_STORE *st, unsigned long flags) | |
435 | { | |
436 | X509 *signer; | |
437 | if (!(flags & OCSP_NOINTERN)) { | |
438 | signer = X509_find_by_subject(req->optionalSignature->certs, nm); | |
439 | if (signer) { | |
440 | *psigner = signer; | |
441 | return 1; | |
442 | } | |
443 | } | |
444 | ||
445 | signer = X509_find_by_subject(certs, nm); | |
446 | if (signer) { | |
447 | *psigner = signer; | |
448 | return 2; | |
449 | } | |
450 | return 0; | |
451 | } |