1 /* ocsp_cl.c */
2 /*
3 * Written by Tom Titchener <Tom_Titchener@groove.net> for the OpenSSL
4 * project.
5 */
6
7 /*
8 * History: This file was transfered to Richard Levitte from CertCo by Kathy
9 * Weinhold in mid-spring 2000 to be included in OpenSSL or released as a
10 * patch kit.
11 */
12
13 /* ====================================================================
14 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 *
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 *
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in
25 * the documentation and/or other materials provided with the
26 * distribution.
27 *
28 * 3. All advertising materials mentioning features or use of this
29 * software must display the following acknowledgment:
30 * "This product includes software developed by the OpenSSL Project
31 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
32 *
33 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
34 * endorse or promote products derived from this software without
35 * prior written permission. For written permission, please contact
36 * openssl-core@openssl.org.
37 *
38 * 5. Products derived from this software may not be called "OpenSSL"
39 * nor may "OpenSSL" appear in their names without prior written
40 * permission of the OpenSSL Project.
41 *
42 * 6. Redistributions of any form whatsoever must retain the following
43 * acknowledgment:
44 * "This product includes software developed by the OpenSSL Project
45 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
48 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
50 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
51 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
52 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
53 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
54 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
56 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
57 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
58 * OF THE POSSIBILITY OF SUCH DAMAGE.
59 * ====================================================================
60 *
61 * This product includes cryptographic software written by Eric Young
62 * (eay@cryptsoft.com). This product includes software written by Tim
63 * Hudson (tjh@cryptsoft.com).
64 *
65 */
66
67 #include <stdio.h>
68 #include <time.h>
69 #include <cryptlib.h>
70 #include <openssl/objects.h>
71 #include <openssl/rand.h>
72 #include <openssl/x509.h>
73 #include <openssl/pem.h>
74 #include <openssl/x509v3.h>
75 #include <openssl/ocsp.h>
76
77 /*
78 * Utility functions related to sending OCSP requests and extracting relevant
79 * information from the response.
80 */
81
82 /*
83 * Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ pointer:
84 * useful if we want to add extensions.
85 */
86
OCSP_request_add0_id(OCSP_REQUEST * req,OCSP_CERTID * cid)87 OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)
88 {
89 OCSP_ONEREQ *one = NULL;
90
91 if (!(one = OCSP_ONEREQ_new()))
92 goto err;
93 if (one->reqCert)
94 OCSP_CERTID_free(one->reqCert);
95 one->reqCert = cid;
96 if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one))
97 goto err;
98 return one;
99 err:
100 OCSP_ONEREQ_free(one);
101 return NULL;
102 }
103
104 /* Set requestorName from an X509_NAME structure */
105
OCSP_request_set1_name(OCSP_REQUEST * req,X509_NAME * nm)106 int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm)
107 {
108 GENERAL_NAME *gen;
109 gen = GENERAL_NAME_new();
110 if (gen == NULL)
111 return 0;
112 if (!X509_NAME_set(&gen->d.directoryName, nm)) {
113 GENERAL_NAME_free(gen);
114 return 0;
115 }
116 gen->type = GEN_DIRNAME;
117 if (req->tbsRequest->requestorName)
118 GENERAL_NAME_free(req->tbsRequest->requestorName);
119 req->tbsRequest->requestorName = gen;
120 return 1;
121 }
122
123 /* Add a certificate to an OCSP request */
124
OCSP_request_add1_cert(OCSP_REQUEST * req,X509 * cert)125 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)
126 {
127 OCSP_SIGNATURE *sig;
128 if (!req->optionalSignature)
129 req->optionalSignature = OCSP_SIGNATURE_new();
130 sig = req->optionalSignature;
131 if (!sig)
132 return 0;
133 if (!cert)
134 return 1;
135 if (!sig->certs && !(sig->certs = sk_X509_new_null()))
136 return 0;
137
138 if (!sk_X509_push(sig->certs, cert))
139 return 0;
140 CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
141 return 1;
142 }
143
144 /*
145 * Sign an OCSP request set the requestorName to the subjec name of an
146 * optional signers certificate and include one or more optional certificates
147 * in the request. Behaves like PKCS7_sign().
148 */
149
OCSP_request_sign(OCSP_REQUEST * req,X509 * signer,EVP_PKEY * key,const EVP_MD * dgst,STACK_OF (X509)* certs,unsigned long flags)150 int OCSP_request_sign(OCSP_REQUEST *req,
151 X509 *signer,
152 EVP_PKEY *key,
153 const EVP_MD *dgst,
154 STACK_OF(X509) *certs, unsigned long flags)
155 {
156 int i;
157 OCSP_SIGNATURE *sig;
158 X509 *x;
159
160 if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))
161 goto err;
162
163 if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new()))
164 goto err;
165 if (key) {
166 if (!X509_check_private_key(signer, key)) {
167 OCSPerr(OCSP_F_OCSP_REQUEST_SIGN,
168 OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
169 goto err;
170 }
171 if (!OCSP_REQUEST_sign(req, key, dgst))
172 goto err;
173 }
174
175 if (!(flags & OCSP_NOCERTS)) {
176 if (!OCSP_request_add1_cert(req, signer))
177 goto err;
178 for (i = 0; i < sk_X509_num(certs); i++) {
179 x = sk_X509_value(certs, i);
180 if (!OCSP_request_add1_cert(req, x))
181 goto err;
182 }
183 }
184
185 return 1;
186 err:
187 OCSP_SIGNATURE_free(req->optionalSignature);
188 req->optionalSignature = NULL;
189 return 0;
190 }
191
192 /* Get response status */
193
OCSP_response_status(OCSP_RESPONSE * resp)194 int OCSP_response_status(OCSP_RESPONSE *resp)
195 {
196 return ASN1_ENUMERATED_get(resp->responseStatus);
197 }
198
199 /*
200 * Extract basic response from OCSP_RESPONSE or NULL if no basic response
201 * present.
202 */
203
OCSP_response_get1_basic(OCSP_RESPONSE * resp)204 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)
205 {
206 OCSP_RESPBYTES *rb;
207 rb = resp->responseBytes;
208 if (!rb) {
209 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);
210 return NULL;
211 }
212 if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) {
213 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);
214 return NULL;
215 }
216
217 return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));
218 }
219
220 /*
221 * Return number of OCSP_SINGLERESP reponses present in a basic response.
222 */
223
OCSP_resp_count(OCSP_BASICRESP * bs)224 int OCSP_resp_count(OCSP_BASICRESP *bs)
225 {
226 if (!bs)
227 return -1;
228 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses);
229 }
230
231 /* Extract an OCSP_SINGLERESP response with a given index */
232
OCSP_resp_get0(OCSP_BASICRESP * bs,int idx)233 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)
234 {
235 if (!bs)
236 return NULL;
237 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx);
238 }
239
240 /* Look single response matching a given certificate ID */
241
OCSP_resp_find(OCSP_BASICRESP * bs,OCSP_CERTID * id,int last)242 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)
243 {
244 int i;
245 STACK_OF(OCSP_SINGLERESP) *sresp;
246 OCSP_SINGLERESP *single;
247 if (!bs)
248 return -1;
249 if (last < 0)
250 last = 0;
251 else
252 last++;
253 sresp = bs->tbsResponseData->responses;
254 for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
255 single = sk_OCSP_SINGLERESP_value(sresp, i);
256 if (!OCSP_id_cmp(id, single->certId))
257 return i;
258 }
259 return -1;
260 }
261
262 /*
263 * Extract status information from an OCSP_SINGLERESP structure. Note: the
264 * revtime and reason values are only set if the certificate status is
265 * revoked. Returns numerical value of status.
266 */
267
OCSP_single_get0_status(OCSP_SINGLERESP * single,int * reason,ASN1_GENERALIZEDTIME ** revtime,ASN1_GENERALIZEDTIME ** thisupd,ASN1_GENERALIZEDTIME ** nextupd)268 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
269 ASN1_GENERALIZEDTIME **revtime,
270 ASN1_GENERALIZEDTIME **thisupd,
271 ASN1_GENERALIZEDTIME **nextupd)
272 {
273 int ret;
274 OCSP_CERTSTATUS *cst;
275 if (!single)
276 return -1;
277 cst = single->certStatus;
278 ret = cst->type;
279 if (ret == V_OCSP_CERTSTATUS_REVOKED) {
280 OCSP_REVOKEDINFO *rev = cst->value.revoked;
281 if (revtime)
282 *revtime = rev->revocationTime;
283 if (reason) {
284 if (rev->revocationReason)
285 *reason = ASN1_ENUMERATED_get(rev->revocationReason);
286 else
287 *reason = -1;
288 }
289 }
290 if (thisupd)
291 *thisupd = single->thisUpdate;
292 if (nextupd)
293 *nextupd = single->nextUpdate;
294 return ret;
295 }
296
297 /*
298 * This function combines the previous ones: look up a certificate ID and if
299 * found extract status information. Return 0 is successful.
300 */
301
OCSP_resp_find_status(OCSP_BASICRESP * bs,OCSP_CERTID * id,int * status,int * reason,ASN1_GENERALIZEDTIME ** revtime,ASN1_GENERALIZEDTIME ** thisupd,ASN1_GENERALIZEDTIME ** nextupd)302 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
303 int *reason,
304 ASN1_GENERALIZEDTIME **revtime,
305 ASN1_GENERALIZEDTIME **thisupd,
306 ASN1_GENERALIZEDTIME **nextupd)
307 {
308 int i;
309 OCSP_SINGLERESP *single;
310 i = OCSP_resp_find(bs, id, -1);
311 /* Maybe check for multiple responses and give an error? */
312 if (i < 0)
313 return 0;
314 single = OCSP_resp_get0(bs, i);
315 i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);
316 if (status)
317 *status = i;
318 return 1;
319 }
320
321 /*
322 * Check validity of thisUpdate and nextUpdate fields. It is possible that
323 * the request will take a few seconds to process and/or the time wont be
324 * totally accurate. Therefore to avoid rejecting otherwise valid time we
325 * allow the times to be within 'nsec' of the current time. Also to avoid
326 * accepting very old responses without a nextUpdate field an optional maxage
327 * parameter specifies the maximum age the thisUpdate field can be.
328 */
329
OCSP_check_validity(ASN1_GENERALIZEDTIME * thisupd,ASN1_GENERALIZEDTIME * nextupd,long nsec,long maxsec)330 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd,
331 ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)
332 {
333 int ret = 1;
334 time_t t_now, t_tmp;
335 time(&t_now);
336 /* Check thisUpdate is valid and not more than nsec in the future */
337 if (!ASN1_GENERALIZEDTIME_check(thisupd)) {
338 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);
339 ret = 0;
340 } else {
341 t_tmp = t_now + nsec;
342 if (X509_cmp_time(thisupd, &t_tmp) > 0) {
343 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);
344 ret = 0;
345 }
346
347 /*
348 * If maxsec specified check thisUpdate is not more than maxsec in
349 * the past
350 */
351 if (maxsec >= 0) {
352 t_tmp = t_now - maxsec;
353 if (X509_cmp_time(thisupd, &t_tmp) < 0) {
354 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);
355 ret = 0;
356 }
357 }
358 }
359
360 if (!nextupd)
361 return ret;
362
363 /* Check nextUpdate is valid and not more than nsec in the past */
364 if (!ASN1_GENERALIZEDTIME_check(nextupd)) {
365 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);
366 ret = 0;
367 } else {
368 t_tmp = t_now - nsec;
369 if (X509_cmp_time(nextupd, &t_tmp) < 0) {
370 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);
371 ret = 0;
372 }
373 }
374
375 /* Also don't allow nextUpdate to precede thisUpdate */
376 if (ASN1_STRING_cmp(nextupd, thisupd) < 0) {
377 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY,
378 OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);
379 ret = 0;
380 }
381
382 return ret;
383 }
384