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source: vbox/trunk/src/libs/openssl-1.1.1l/crypto/ocsp/ocsp_vfy.c@ 91772

Last change on this file since 91772 was 91772, checked in by vboxsync, 3 years ago

openssl-1.1.1l: Applied and adjusted our OpenSSL changes to 1.1.1l. bugref:10126
File size: 13.0 KB
Line 
1/*
2 * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
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
8 */
9
10#include <openssl/ocsp.h>
11#include "ocsp_local.h"
12#include <openssl/err.h>
13#include <string.h>
14
15static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs,
16 STACK_OF(X509) *certs, unsigned long flags);
17static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id);
18static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain);
19static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp,
20 OCSP_CERTID **ret);
21static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
22 STACK_OF(OCSP_SINGLERESP) *sresp);
23static int ocsp_check_delegated(X509 *x);
24static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
25 X509_NAME *nm, STACK_OF(X509) *certs,
26 unsigned long flags);
27
28/* Verify a basic response message */
29
30int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
31 X509_STORE *st, unsigned long flags)
32{
33 X509 *signer, *x;
34 STACK_OF(X509) *chain = NULL;
35 STACK_OF(X509) *untrusted = NULL;
36 X509_STORE_CTX *ctx = NULL;
37 int i, ret = ocsp_find_signer(&signer, bs, certs, flags);
38
39 if (!ret) {
40 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
41 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
42 goto end;
43 }
44 ctx = X509_STORE_CTX_new();
45 if (ctx == NULL) {
46 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_MALLOC_FAILURE);
47 goto f_err;
48 }
49 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
50 flags |= OCSP_NOVERIFY;
51 if (!(flags & OCSP_NOSIGS)) {
52 EVP_PKEY *skey;
53 skey = X509_get0_pubkey(signer);
54 if (skey == NULL) {
55 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_NO_SIGNER_KEY);
56 goto err;
57 }
58 ret = OCSP_BASICRESP_verify(bs, skey, 0);
59 if (ret <= 0) {
60 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNATURE_FAILURE);
61 goto end;
62 }
63 }
64 if (!(flags & OCSP_NOVERIFY)) {
65 int init_res;
66 if (flags & OCSP_NOCHAIN) {
67 untrusted = NULL;
68 } else if (bs->certs && certs) {
69 untrusted = sk_X509_dup(bs->certs);
70 for (i = 0; i < sk_X509_num(certs); i++) {
71 if (!sk_X509_push(untrusted, sk_X509_value(certs, i))) {
72 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_MALLOC_FAILURE);
73 goto f_err;
74 }
75 }
76 } else if (certs != NULL) {
77 untrusted = certs;
78 } else {
79 untrusted = bs->certs;
80 }
81 init_res = X509_STORE_CTX_init(ctx, st, signer, untrusted);
82 if (!init_res) {
83 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_X509_LIB);
84 goto f_err;
85 }
86
87 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_OCSP_HELPER);
88 ret = X509_verify_cert(ctx);
89 chain = X509_STORE_CTX_get1_chain(ctx);
90 if (ret <= 0) {
91 i = X509_STORE_CTX_get_error(ctx);
92 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
93 OCSP_R_CERTIFICATE_VERIFY_ERROR);
94 ERR_add_error_data(2, "Verify error:",
95 X509_verify_cert_error_string(i));
96 goto end;
97 }
98 if (flags & OCSP_NOCHECKS) {
99 ret = 1;
100 goto end;
101 }
102 /*
103 * At this point we have a valid certificate chain need to verify it
104 * against the OCSP issuer criteria.
105 */
106 ret = ocsp_check_issuer(bs, chain);
107
108 /* If fatal error or valid match then finish */
109 if (ret != 0)
110 goto end;
111
112 /*
113 * Easy case: explicitly trusted. Get root CA and check for explicit
114 * trust
115 */
116 if (flags & OCSP_NOEXPLICIT)
117 goto end;
118
119 x = sk_X509_value(chain, sk_X509_num(chain) - 1);
120 if (X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED) {
121 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_ROOT_CA_NOT_TRUSTED);
122 goto err;
123 }
124 ret = 1;
125 }
126 end:
127 X509_STORE_CTX_free(ctx);
128 sk_X509_pop_free(chain, X509_free);
129 if (bs->certs && certs)
130 sk_X509_free(untrusted);
131 return ret;
132
133 err:
134 ret = 0;
135 goto end;
136 f_err:
137 ret = -1;
138 goto end;
139}
140
141int OCSP_resp_get0_signer(OCSP_BASICRESP *bs, X509 **signer,
142 STACK_OF(X509) *extra_certs)
143{
144 int ret;
145
146 ret = ocsp_find_signer(signer, bs, extra_certs, 0);
147 return (ret > 0) ? 1 : 0;
148}
149
150static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs,
151 STACK_OF(X509) *certs, unsigned long flags)
152{
153 X509 *signer;
154 OCSP_RESPID *rid = &bs->tbsResponseData.responderId;
155 if ((signer = ocsp_find_signer_sk(certs, rid))) {
156 *psigner = signer;
157 return 2;
158 }
159 if (!(flags & OCSP_NOINTERN) &&
160 (signer = ocsp_find_signer_sk(bs->certs, rid))) {
161 *psigner = signer;
162 return 1;
163 }
164 /* Maybe lookup from store if by subject name */
165
166 *psigner = NULL;
167 return 0;
168}
169
170static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id)
171{
172 int i;
173 unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
174 X509 *x;
175
176 /* Easy if lookup by name */
177 if (id->type == V_OCSP_RESPID_NAME)
178 return X509_find_by_subject(certs, id->value.byName);
179
180 /* Lookup by key hash */
181
182 /* If key hash isn't SHA1 length then forget it */
183 if (id->value.byKey->length != SHA_DIGEST_LENGTH)
184 return NULL;
185 keyhash = id->value.byKey->data;
186 /* Calculate hash of each key and compare */
187 for (i = 0; i < sk_X509_num(certs); i++) {
188 x = sk_X509_value(certs, i);
189 X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
190 if (!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
191 return x;
192 }
193 return NULL;
194}
195
196static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain)
197{
198 STACK_OF(OCSP_SINGLERESP) *sresp;
199 X509 *signer, *sca;
200 OCSP_CERTID *caid = NULL;
201 int i;
202 sresp = bs->tbsResponseData.responses;
203
204 if (sk_X509_num(chain) <= 0) {
205 OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN);
206 return -1;
207 }
208
209 /* See if the issuer IDs match. */
210 i = ocsp_check_ids(sresp, &caid);
211
212 /* If ID mismatch or other error then return */
213 if (i <= 0)
214 return i;
215
216 signer = sk_X509_value(chain, 0);
217 /* Check to see if OCSP responder CA matches request CA */
218 if (sk_X509_num(chain) > 1) {
219 sca = sk_X509_value(chain, 1);
220 i = ocsp_match_issuerid(sca, caid, sresp);
221 if (i < 0)
222 return i;
223 if (i) {
224 /* We have a match, if extensions OK then success */
225 if (ocsp_check_delegated(signer))
226 return 1;
227 return 0;
228 }
229 }
230
231 /* Otherwise check if OCSP request signed directly by request CA */
232 return ocsp_match_issuerid(signer, caid, sresp);
233}
234
235/*
236 * Check the issuer certificate IDs for equality. If there is a mismatch with
237 * the same algorithm then there's no point trying to match any certificates
238 * against the issuer. If the issuer IDs all match then we just need to check
239 * equality against one of them.
240 */
241
242static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret)
243{
244 OCSP_CERTID *tmpid, *cid;
245 int i, idcount;
246
247 idcount = sk_OCSP_SINGLERESP_num(sresp);
248 if (idcount <= 0) {
249 OCSPerr(OCSP_F_OCSP_CHECK_IDS,
250 OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
251 return -1;
252 }
253
254 cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
255
256 *ret = NULL;
257
258 for (i = 1; i < idcount; i++) {
259 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
260 /* Check to see if IDs match */
261 if (OCSP_id_issuer_cmp(cid, tmpid)) {
262 /* If algorithm mismatch let caller deal with it */
263 if (OBJ_cmp(tmpid->hashAlgorithm.algorithm,
264 cid->hashAlgorithm.algorithm))
265 return 2;
266 /* Else mismatch */
267 return 0;
268 }
269 }
270
271 /* All IDs match: only need to check one ID */
272 *ret = cid;
273 return 1;
274}
275
276static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
277 STACK_OF(OCSP_SINGLERESP) *sresp)
278{
279 /* If only one ID to match then do it */
280 if (cid) {
281 const EVP_MD *dgst;
282 X509_NAME *iname;
283 int mdlen;
284 unsigned char md[EVP_MAX_MD_SIZE];
285 if ((dgst = EVP_get_digestbyobj(cid->hashAlgorithm.algorithm))
286 == NULL) {
287 OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID,
288 OCSP_R_UNKNOWN_MESSAGE_DIGEST);
289 return -1;
290 }
291
292 mdlen = EVP_MD_size(dgst);
293 if (mdlen < 0)
294 return -1;
295 if ((cid->issuerNameHash.length != mdlen) ||
296 (cid->issuerKeyHash.length != mdlen))
297 return 0;
298 iname = X509_get_subject_name(cert);
299 if (!X509_NAME_digest(iname, dgst, md, NULL))
300 return -1;
301 if (memcmp(md, cid->issuerNameHash.data, mdlen))
302 return 0;
303 X509_pubkey_digest(cert, dgst, md, NULL);
304 if (memcmp(md, cid->issuerKeyHash.data, mdlen))
305 return 0;
306
307 return 1;
308
309 } else {
310 /* We have to match the whole lot */
311 int i, ret;
312 OCSP_CERTID *tmpid;
313 for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
314 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
315 ret = ocsp_match_issuerid(cert, tmpid, NULL);
316 if (ret <= 0)
317 return ret;
318 }
319 return 1;
320 }
321
322}
323
324static int ocsp_check_delegated(X509 *x)
325{
326 if ((X509_get_extension_flags(x) & EXFLAG_XKUSAGE)
327 && (X509_get_extended_key_usage(x) & XKU_OCSP_SIGN))
328 return 1;
329 OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE);
330 return 0;
331}
332
333/*
334 * Verify an OCSP request. This is fortunately much easier than OCSP response
335 * verify. Just find the signers certificate and verify it against a given
336 * trust value.
337 */
338
339int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs,
340 X509_STORE *store, unsigned long flags)
341{
342 X509 *signer;
343 X509_NAME *nm;
344 GENERAL_NAME *gen;
345 int ret = 0;
346 X509_STORE_CTX *ctx = X509_STORE_CTX_new();
347
348 if (ctx == NULL) {
349 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_MALLOC_FAILURE);
350 goto err;
351 }
352
353 if (!req->optionalSignature) {
354 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);
355 goto err;
356 }
357 gen = req->tbsRequest.requestorName;
358 if (!gen || gen->type != GEN_DIRNAME) {
359 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
360 OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
361 goto err;
362 }
363 nm = gen->d.directoryName;
364 ret = ocsp_req_find_signer(&signer, req, nm, certs, flags);
365 if (ret <= 0) {
366 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
367 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
368 goto err;
369 }
370 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
371 flags |= OCSP_NOVERIFY;
372 if (!(flags & OCSP_NOSIGS)) {
373 EVP_PKEY *skey;
374 skey = X509_get0_pubkey(signer);
375 ret = OCSP_REQUEST_verify(req, skey);
376 if (ret <= 0) {
377 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE);
378 goto err;
379 }
380 }
381 if (!(flags & OCSP_NOVERIFY)) {
382 int init_res;
383 if (flags & OCSP_NOCHAIN)
384 init_res = X509_STORE_CTX_init(ctx, store, signer, NULL);
385 else
386 init_res = X509_STORE_CTX_init(ctx, store, signer,
387 req->optionalSignature->certs);
388 if (!init_res) {
389 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_X509_LIB);
390 goto err;
391 }
392
393 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_OCSP_HELPER);
394 X509_STORE_CTX_set_trust(ctx, X509_TRUST_OCSP_REQUEST);
395 ret = X509_verify_cert(ctx);
396 if (ret <= 0) {
397 ret = X509_STORE_CTX_get_error(ctx);
398 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
399 OCSP_R_CERTIFICATE_VERIFY_ERROR);
400 ERR_add_error_data(2, "Verify error:",
401 X509_verify_cert_error_string(ret));
402 goto err;
403 }
404 }
405 ret = 1;
406 goto end;
407
408err:
409 ret = 0;
410end:
411 X509_STORE_CTX_free(ctx);
412 return ret;
413
414}
415
416static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
417 X509_NAME *nm, STACK_OF(X509) *certs,
418 unsigned long flags)
419{
420 X509 *signer;
421 if (!(flags & OCSP_NOINTERN)) {
422 signer = X509_find_by_subject(req->optionalSignature->certs, nm);
423 if (signer) {
424 *psigner = signer;
425 return 1;
426 }
427 }
428
429 signer = X509_find_by_subject(certs, nm);
430 if (signer) {
431 *psigner = signer;
432 return 2;
433 }
434 return 0;
435}
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