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-rw-r--r--src/lib/libcrypto/ocsp/ocsp_vfy.c448
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diff --git a/src/lib/libcrypto/ocsp/ocsp_vfy.c b/src/lib/libcrypto/ocsp/ocsp_vfy.c
deleted file mode 100644
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--- a/src/lib/libcrypto/ocsp/ocsp_vfy.c
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1/* $OpenBSD: ocsp_vfy.c,v 1.12 2014/07/09 19:08:10 tedu Exp $ */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2000.
4 */
5/* ====================================================================
6 * Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved.
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
13 * notice, this list of conditions and the following disclaimer.
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>
60#include <openssl/err.h>
61#include <string.h>
62
63static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs,
64 STACK_OF(X509) *certs, X509_STORE *st, unsigned long flags);
65static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id);
66static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain,
67 unsigned long flags);
68static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret);
69static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
70 STACK_OF(OCSP_SINGLERESP) *sresp);
71static int ocsp_check_delegated(X509 *x, int flags);
72static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
73 X509_NAME *nm, STACK_OF(X509) *certs, X509_STORE *st,
74 unsigned long flags);
75
76/* Verify a basic response message */
77int
78OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs, X509_STORE *st,
79 unsigned long flags)
80{
81 X509 *signer, *x;
82 STACK_OF(X509) *chain = NULL;
83 X509_STORE_CTX ctx;
84 int i, ret = 0;
85
86 ret = ocsp_find_signer(&signer, bs, certs, st, flags);
87 if (!ret) {
88 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
89 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
90 goto end;
91 }
92 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
93 flags |= OCSP_NOVERIFY;
94 if (!(flags & OCSP_NOSIGS)) {
95 EVP_PKEY *skey;
96
97 skey = X509_get_pubkey(signer);
98 if (skey) {
99 ret = OCSP_BASICRESP_verify(bs, skey, 0);
100 EVP_PKEY_free(skey);
101 }
102 if (!skey || ret <= 0) {
103 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
104 OCSP_R_SIGNATURE_FAILURE);
105 goto end;
106 }
107 }
108 if (!(flags & OCSP_NOVERIFY)) {
109 int init_res;
110
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,
115 bs->certs);
116 if (!init_res) {
117 ret = -1;
118 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_X509_LIB);
119 goto end;
120 }
121
122 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
123 ret = X509_verify_cert(&ctx);
124 chain = X509_STORE_CTX_get1_chain(&ctx);
125 X509_STORE_CTX_cleanup(&ctx);
126 if (ret <= 0) {
127 i = X509_STORE_CTX_get_error(&ctx);
128 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
129 OCSP_R_CERTIFICATE_VERIFY_ERROR);
130 ERR_asprintf_error_data("Verify error:%s",
131 X509_verify_cert_error_string(i));
132 goto end;
133 }
134 if (flags & OCSP_NOCHECKS) {
135 ret = 1;
136 goto end;
137 }
138 /* At this point we have a valid certificate chain
139 * need to verify it 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 /* Easy case: explicitly trusted. Get root CA and
148 * check for explicit trust
149 */
150 if (flags & OCSP_NOEXPLICIT)
151 goto end;
152
153 x = sk_X509_value(chain, sk_X509_num(chain) - 1);
154 if (X509_check_trust(x, NID_OCSP_sign, 0) !=
155 X509_TRUST_TRUSTED) {
156 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
157 OCSP_R_ROOT_CA_NOT_TRUSTED);
158 goto end;
159 }
160 ret = 1;
161 }
162
163end:
164 if (chain)
165 sk_X509_pop_free(chain, X509_free);
166 return ret;
167}
168
169static int
170ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
171 X509_STORE *st, unsigned long flags)
172{
173 X509 *signer;
174 OCSP_RESPID *rid = bs->tbsResponseData->responderId;
175
176 if ((signer = ocsp_find_signer_sk(certs, rid))) {
177 *psigner = signer;
178 return 2;
179 }
180 if (!(flags & OCSP_NOINTERN) &&
181 (signer = ocsp_find_signer_sk(bs->certs, rid))) {
182 *psigner = signer;
183 return 1;
184 }
185 /* Maybe lookup from store if by subject name */
186
187 *psigner = NULL;
188 return 0;
189}
190
191static X509 *
192ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id)
193{
194 int i;
195 unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
196 X509 *x;
197
198 /* Easy if lookup by name */
199 if (id->type == V_OCSP_RESPID_NAME)
200 return X509_find_by_subject(certs, id->value.byName);
201
202 /* Lookup by key hash */
203
204 /* If key hash isn't SHA1 length then forget it */
205 if (id->value.byKey->length != SHA_DIGEST_LENGTH)
206 return NULL;
207 keyhash = id->value.byKey->data;
208 /* Calculate hash of each key and compare */
209 for (i = 0; i < sk_X509_num(certs); i++) {
210 x = sk_X509_value(certs, i);
211 X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
212 if (!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
213 return x;
214 }
215 return NULL;
216}
217
218static int
219ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain,
220 unsigned long flags)
221{
222 STACK_OF(OCSP_SINGLERESP) *sresp;
223 X509 *signer, *sca;
224 OCSP_CERTID *caid = NULL;
225 int i;
226
227 sresp = bs->tbsResponseData->responses;
228
229 if (sk_X509_num(chain) <= 0) {
230 OCSPerr(OCSP_F_OCSP_CHECK_ISSUER,
231 OCSP_R_NO_CERTIFICATES_IN_CHAIN);
232 return -1;
233 }
234
235 /* See if the issuer IDs match. */
236 i = ocsp_check_ids(sresp, &caid);
237
238 /* If ID mismatch or other error then return */
239 if (i <= 0)
240 return i;
241
242 signer = sk_X509_value(chain, 0);
243 /* Check to see if OCSP responder CA matches request CA */
244 if (sk_X509_num(chain) > 1) {
245 sca = sk_X509_value(chain, 1);
246 i = ocsp_match_issuerid(sca, caid, sresp);
247 if (i < 0)
248 return i;
249 if (i) {
250 /* We have a match, if extensions OK then success */
251 if (ocsp_check_delegated(signer, flags))
252 return 1;
253 return 0;
254 }
255 }
256
257 /* Otherwise check if OCSP request signed directly by request CA */
258 return ocsp_match_issuerid(signer, caid, sresp);
259}
260
261/* Check the issuer certificate IDs for equality. If there is a mismatch with the same
262 * algorithm then there's no point trying to match any certificates against the issuer.
263 * If the issuer IDs all match then we just need to check equality against one of them.
264 */
265static int
266ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret)
267{
268 OCSP_CERTID *tmpid, *cid;
269 int i, idcount;
270
271 idcount = sk_OCSP_SINGLERESP_num(sresp);
272 if (idcount <= 0) {
273 OCSPerr(OCSP_F_OCSP_CHECK_IDS,
274 OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
275 return -1;
276 }
277
278 cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
279
280 *ret = NULL;
281
282 for (i = 1; i < idcount; i++) {
283 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
284 /* Check to see if IDs match */
285 if (OCSP_id_issuer_cmp(cid, tmpid)) {
286 return 0;
287 }
288 }
289
290 /* All IDs match: only need to check one ID */
291 *ret = cid;
292 return 1;
293}
294
295static int
296ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
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
306 if (!(dgst =
307 EVP_get_digestbyobj(cid->hashAlgorithm->algorithm))) {
308 OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID,
309 OCSP_R_UNKNOWN_MESSAGE_DIGEST);
310 return -1;
311 }
312
313 mdlen = EVP_MD_size(dgst);
314 if (mdlen < 0)
315 return -1;
316 if (cid->issuerNameHash->length != mdlen ||
317 cid->issuerKeyHash->length != mdlen)
318 return 0;
319 iname = X509_get_subject_name(cert);
320 if (!X509_NAME_digest(iname, dgst, md, NULL))
321 return -1;
322 if (memcmp(md, cid->issuerNameHash->data, mdlen))
323 return 0;
324 X509_pubkey_digest(cert, dgst, md, NULL);
325 if (memcmp(md, cid->issuerKeyHash->data, mdlen))
326 return 0;
327
328 return 1;
329 } else {
330 /* We have to match the whole lot */
331 int i, ret;
332 OCSP_CERTID *tmpid;
333
334 for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
335 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
336 ret = ocsp_match_issuerid(cert, tmpid, NULL);
337 if (ret <= 0)
338 return ret;
339 }
340 return 1;
341 }
342}
343
344static int
345ocsp_check_delegated(X509 *x, int flags)
346{
347 X509_check_purpose(x, -1, 0);
348 if ((x->ex_flags & EXFLAG_XKUSAGE) && (x->ex_xkusage & XKU_OCSP_SIGN))
349 return 1;
350 OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE);
351 return 0;
352}
353
354/* Verify an OCSP request. This is fortunately much easier than OCSP
355 * response verify. Just find the signers certificate and verify it
356 * against a given trust value.
357 */
358int
359OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs, X509_STORE *store,
360 unsigned long flags)
361{
362 X509 *signer;
363 X509_NAME *nm;
364 GENERAL_NAME *gen;
365 int ret;
366 X509_STORE_CTX ctx;
367
368 if (!req->optionalSignature) {
369 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);
370 return 0;
371 }
372 gen = req->tbsRequest->requestorName;
373 if (!gen || gen->type != GEN_DIRNAME) {
374 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
375 OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
376 return 0;
377 }
378 nm = gen->d.directoryName;
379 ret = ocsp_req_find_signer(&signer, req, nm, certs, store, flags);
380 if (ret <= 0) {
381 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
382 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
383 return 0;
384 }
385 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
386 flags |= OCSP_NOVERIFY;
387 if (!(flags & OCSP_NOSIGS)) {
388 EVP_PKEY *skey;
389
390 skey = X509_get_pubkey(signer);
391 ret = OCSP_REQUEST_verify(req, skey);
392 EVP_PKEY_free(skey);
393 if (ret <= 0) {
394 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
395 OCSP_R_SIGNATURE_FAILURE);
396 return 0;
397 }
398 }
399 if (!(flags & OCSP_NOVERIFY)) {
400 int init_res;
401
402 if (flags & OCSP_NOCHAIN)
403 init_res = X509_STORE_CTX_init(&ctx, store, signer,
404 NULL);
405 else
406 init_res = X509_STORE_CTX_init(&ctx, store, signer,
407 req->optionalSignature->certs);
408 if (!init_res) {
409 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_X509_LIB);
410 return 0;
411 }
412
413 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
414 X509_STORE_CTX_set_trust(&ctx, X509_TRUST_OCSP_REQUEST);
415 ret = X509_verify_cert(&ctx);
416 X509_STORE_CTX_cleanup(&ctx);
417 if (ret <= 0) {
418 ret = X509_STORE_CTX_get_error(&ctx);
419 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
420 OCSP_R_CERTIFICATE_VERIFY_ERROR);
421 ERR_asprintf_error_data("Verify error:%s",
422 X509_verify_cert_error_string(ret));
423 return 0;
424 }
425 }
426 return 1;
427}
428
429static int
430ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, X509_NAME *nm,
431 STACK_OF(X509) *certs, X509_STORE *st, unsigned long flags)
432{
433 X509 *signer;
434
435 if (!(flags & OCSP_NOINTERN)) {
436 signer =
437 X509_find_by_subject(req->optionalSignature->certs, nm);
438 *psigner = signer;
439 return 1;
440 }
441
442 signer = X509_find_by_subject(certs, nm);
443 if (signer) {
444 *psigner = signer;
445 return 2;
446 }
447 return 0;
448}
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