1 /*
2 * Copyright 2001-2018 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 <stdio.h>
11 #include <time.h>
12 #include "internal/cryptlib.h"
13 #include <openssl/asn1.h>
14 #include <openssl/objects.h>
15 #include <openssl/x509.h>
16 #include <openssl/pem.h>
17 #include <openssl/x509v3.h>
18 #include <openssl/ocsp.h>
19 #include "ocsp_local.h"
20
21 /*
22 * Utility functions related to sending OCSP requests and extracting relevant
23 * information from the response.
24 */
25
26 /*
27 * Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ pointer:
28 * useful if we want to add extensions.
29 */
30
OCSP_request_add0_id(OCSP_REQUEST * req,OCSP_CERTID * cid)31 OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)
32 {
33 OCSP_ONEREQ *one = NULL;
34
35 if ((one = OCSP_ONEREQ_new()) == NULL)
36 return NULL;
37 OCSP_CERTID_free(one->reqCert);
38 one->reqCert = cid;
39 if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest.requestList, one)) {
40 one->reqCert = NULL; /* do not free on error */
41 goto err;
42 }
43 return one;
44 err:
45 OCSP_ONEREQ_free(one);
46 return NULL;
47 }
48
49 /* Set requestorName from an X509_NAME structure */
50
OCSP_request_set1_name(OCSP_REQUEST * req,X509_NAME * nm)51 int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm)
52 {
53 GENERAL_NAME *gen;
54
55 gen = GENERAL_NAME_new();
56 if (gen == NULL)
57 return 0;
58 if (!X509_NAME_set(&gen->d.directoryName, nm)) {
59 GENERAL_NAME_free(gen);
60 return 0;
61 }
62 gen->type = GEN_DIRNAME;
63 GENERAL_NAME_free(req->tbsRequest.requestorName);
64 req->tbsRequest.requestorName = gen;
65 return 1;
66 }
67
68 /* Add a certificate to an OCSP request */
69
OCSP_request_add1_cert(OCSP_REQUEST * req,X509 * cert)70 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)
71 {
72 OCSP_SIGNATURE *sig;
73 if (req->optionalSignature == NULL)
74 req->optionalSignature = OCSP_SIGNATURE_new();
75 sig = req->optionalSignature;
76 if (sig == NULL)
77 return 0;
78 if (cert == NULL)
79 return 1;
80 if (sig->certs == NULL
81 && (sig->certs = sk_X509_new_null()) == NULL)
82 return 0;
83
84 if (!sk_X509_push(sig->certs, cert))
85 return 0;
86 X509_up_ref(cert);
87 return 1;
88 }
89
90 /*
91 * Sign an OCSP request set the requestorName to the subject name of an
92 * optional signers certificate and include one or more optional certificates
93 * in the request. Behaves like PKCS7_sign().
94 */
95
OCSP_request_sign(OCSP_REQUEST * req,X509 * signer,EVP_PKEY * key,const EVP_MD * dgst,STACK_OF (X509)* certs,unsigned long flags)96 int OCSP_request_sign(OCSP_REQUEST *req,
97 X509 *signer,
98 EVP_PKEY *key,
99 const EVP_MD *dgst,
100 STACK_OF(X509) *certs, unsigned long flags)
101 {
102 int i;
103 X509 *x;
104
105 if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))
106 goto err;
107
108 if ((req->optionalSignature = OCSP_SIGNATURE_new()) == NULL)
109 goto err;
110 if (key) {
111 if (!X509_check_private_key(signer, key)) {
112 OCSPerr(OCSP_F_OCSP_REQUEST_SIGN,
113 OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
114 goto err;
115 }
116 if (!OCSP_REQUEST_sign(req, key, dgst))
117 goto err;
118 }
119
120 if (!(flags & OCSP_NOCERTS)) {
121 if (!OCSP_request_add1_cert(req, signer))
122 goto err;
123 for (i = 0; i < sk_X509_num(certs); i++) {
124 x = sk_X509_value(certs, i);
125 if (!OCSP_request_add1_cert(req, x))
126 goto err;
127 }
128 }
129
130 return 1;
131 err:
132 OCSP_SIGNATURE_free(req->optionalSignature);
133 req->optionalSignature = NULL;
134 return 0;
135 }
136
137 /* Get response status */
138
OCSP_response_status(OCSP_RESPONSE * resp)139 int OCSP_response_status(OCSP_RESPONSE *resp)
140 {
141 return ASN1_ENUMERATED_get(resp->responseStatus);
142 }
143
144 /*
145 * Extract basic response from OCSP_RESPONSE or NULL if no basic response
146 * present.
147 */
148
OCSP_response_get1_basic(OCSP_RESPONSE * resp)149 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)
150 {
151 OCSP_RESPBYTES *rb;
152 rb = resp->responseBytes;
153 if (!rb) {
154 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);
155 return NULL;
156 }
157 if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) {
158 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);
159 return NULL;
160 }
161
162 return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));
163 }
164
OCSP_resp_get0_signature(const OCSP_BASICRESP * bs)165 const ASN1_OCTET_STRING *OCSP_resp_get0_signature(const OCSP_BASICRESP *bs)
166 {
167 return bs->signature;
168 }
169
OCSP_resp_get0_tbs_sigalg(const OCSP_BASICRESP * bs)170 const X509_ALGOR *OCSP_resp_get0_tbs_sigalg(const OCSP_BASICRESP *bs)
171 {
172 return &bs->signatureAlgorithm;
173 }
174
OCSP_resp_get0_respdata(const OCSP_BASICRESP * bs)175 const OCSP_RESPDATA *OCSP_resp_get0_respdata(const OCSP_BASICRESP *bs)
176 {
177 return &bs->tbsResponseData;
178 }
179
180 /*
181 * Return number of OCSP_SINGLERESP responses present in a basic response.
182 */
183
OCSP_resp_count(OCSP_BASICRESP * bs)184 int OCSP_resp_count(OCSP_BASICRESP *bs)
185 {
186 if (!bs)
187 return -1;
188 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData.responses);
189 }
190
191 /* Extract an OCSP_SINGLERESP response with a given index */
192
OCSP_resp_get0(OCSP_BASICRESP * bs,int idx)193 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)
194 {
195 if (!bs)
196 return NULL;
197 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData.responses, idx);
198 }
199
OCSP_resp_get0_produced_at(const OCSP_BASICRESP * bs)200 const ASN1_GENERALIZEDTIME *OCSP_resp_get0_produced_at(const OCSP_BASICRESP* bs)
201 {
202 return bs->tbsResponseData.producedAt;
203 }
204
STACK_OF(X509)205 const STACK_OF(X509) *OCSP_resp_get0_certs(const OCSP_BASICRESP *bs)
206 {
207 return bs->certs;
208 }
209
OCSP_resp_get0_id(const OCSP_BASICRESP * bs,const ASN1_OCTET_STRING ** pid,const X509_NAME ** pname)210 int OCSP_resp_get0_id(const OCSP_BASICRESP *bs,
211 const ASN1_OCTET_STRING **pid,
212 const X509_NAME **pname)
213 {
214 const OCSP_RESPID *rid = &bs->tbsResponseData.responderId;
215
216 if (rid->type == V_OCSP_RESPID_NAME) {
217 *pname = rid->value.byName;
218 *pid = NULL;
219 } else if (rid->type == V_OCSP_RESPID_KEY) {
220 *pid = rid->value.byKey;
221 *pname = NULL;
222 } else {
223 return 0;
224 }
225 return 1;
226 }
227
OCSP_resp_get1_id(const OCSP_BASICRESP * bs,ASN1_OCTET_STRING ** pid,X509_NAME ** pname)228 int OCSP_resp_get1_id(const OCSP_BASICRESP *bs,
229 ASN1_OCTET_STRING **pid,
230 X509_NAME **pname)
231 {
232 const OCSP_RESPID *rid = &bs->tbsResponseData.responderId;
233
234 if (rid->type == V_OCSP_RESPID_NAME) {
235 *pname = X509_NAME_dup(rid->value.byName);
236 *pid = NULL;
237 } else if (rid->type == V_OCSP_RESPID_KEY) {
238 *pid = ASN1_OCTET_STRING_dup(rid->value.byKey);
239 *pname = NULL;
240 } else {
241 return 0;
242 }
243 if (*pname == NULL && *pid == NULL)
244 return 0;
245 return 1;
246 }
247
248 /* Look single response matching a given certificate ID */
249
OCSP_resp_find(OCSP_BASICRESP * bs,OCSP_CERTID * id,int last)250 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)
251 {
252 int i;
253 STACK_OF(OCSP_SINGLERESP) *sresp;
254 OCSP_SINGLERESP *single;
255 if (!bs)
256 return -1;
257 if (last < 0)
258 last = 0;
259 else
260 last++;
261 sresp = bs->tbsResponseData.responses;
262 for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
263 single = sk_OCSP_SINGLERESP_value(sresp, i);
264 if (!OCSP_id_cmp(id, single->certId))
265 return i;
266 }
267 return -1;
268 }
269
270 /*
271 * Extract status information from an OCSP_SINGLERESP structure. Note: the
272 * revtime and reason values are only set if the certificate status is
273 * revoked. Returns numerical value of status.
274 */
275
OCSP_single_get0_status(OCSP_SINGLERESP * single,int * reason,ASN1_GENERALIZEDTIME ** revtime,ASN1_GENERALIZEDTIME ** thisupd,ASN1_GENERALIZEDTIME ** nextupd)276 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
277 ASN1_GENERALIZEDTIME **revtime,
278 ASN1_GENERALIZEDTIME **thisupd,
279 ASN1_GENERALIZEDTIME **nextupd)
280 {
281 int ret;
282 OCSP_CERTSTATUS *cst;
283 if (!single)
284 return -1;
285 cst = single->certStatus;
286 ret = cst->type;
287 if (ret == V_OCSP_CERTSTATUS_REVOKED) {
288 OCSP_REVOKEDINFO *rev = cst->value.revoked;
289 if (revtime)
290 *revtime = rev->revocationTime;
291 if (reason) {
292 if (rev->revocationReason)
293 *reason = ASN1_ENUMERATED_get(rev->revocationReason);
294 else
295 *reason = -1;
296 }
297 }
298 if (thisupd)
299 *thisupd = single->thisUpdate;
300 if (nextupd)
301 *nextupd = single->nextUpdate;
302 return ret;
303 }
304
305 /*
306 * This function combines the previous ones: look up a certificate ID and if
307 * found extract status information. Return 0 is successful.
308 */
309
OCSP_resp_find_status(OCSP_BASICRESP * bs,OCSP_CERTID * id,int * status,int * reason,ASN1_GENERALIZEDTIME ** revtime,ASN1_GENERALIZEDTIME ** thisupd,ASN1_GENERALIZEDTIME ** nextupd)310 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
311 int *reason,
312 ASN1_GENERALIZEDTIME **revtime,
313 ASN1_GENERALIZEDTIME **thisupd,
314 ASN1_GENERALIZEDTIME **nextupd)
315 {
316 int i;
317 OCSP_SINGLERESP *single;
318 i = OCSP_resp_find(bs, id, -1);
319 /* Maybe check for multiple responses and give an error? */
320 if (i < 0)
321 return 0;
322 single = OCSP_resp_get0(bs, i);
323 i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);
324 if (status)
325 *status = i;
326 return 1;
327 }
328
329 /*
330 * Check validity of thisUpdate and nextUpdate fields. It is possible that
331 * the request will take a few seconds to process and/or the time won't be
332 * totally accurate. Therefore to avoid rejecting otherwise valid time we
333 * allow the times to be within 'nsec' of the current time. Also to avoid
334 * accepting very old responses without a nextUpdate field an optional maxage
335 * parameter specifies the maximum age the thisUpdate field can be.
336 */
337
OCSP_check_validity(ASN1_GENERALIZEDTIME * thisupd,ASN1_GENERALIZEDTIME * nextupd,long nsec,long maxsec)338 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd,
339 ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)
340 {
341 int ret = 1;
342 time_t t_now, t_tmp;
343 time(&t_now);
344 /* Check thisUpdate is valid and not more than nsec in the future */
345 if (!ASN1_GENERALIZEDTIME_check(thisupd)) {
346 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);
347 ret = 0;
348 } else {
349 t_tmp = t_now + nsec;
350 if (X509_cmp_time(thisupd, &t_tmp) > 0) {
351 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);
352 ret = 0;
353 }
354
355 /*
356 * If maxsec specified check thisUpdate is not more than maxsec in
357 * the past
358 */
359 if (maxsec >= 0) {
360 t_tmp = t_now - maxsec;
361 if (X509_cmp_time(thisupd, &t_tmp) < 0) {
362 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);
363 ret = 0;
364 }
365 }
366 }
367
368 if (!nextupd)
369 return ret;
370
371 /* Check nextUpdate is valid and not more than nsec in the past */
372 if (!ASN1_GENERALIZEDTIME_check(nextupd)) {
373 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);
374 ret = 0;
375 } else {
376 t_tmp = t_now - nsec;
377 if (X509_cmp_time(nextupd, &t_tmp) < 0) {
378 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);
379 ret = 0;
380 }
381 }
382
383 /* Also don't allow nextUpdate to precede thisUpdate */
384 if (ASN1_STRING_cmp(nextupd, thisupd) < 0) {
385 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY,
386 OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);
387 ret = 0;
388 }
389
390 return ret;
391 }
392
OCSP_SINGLERESP_get0_id(const OCSP_SINGLERESP * single)393 const OCSP_CERTID *OCSP_SINGLERESP_get0_id(const OCSP_SINGLERESP *single)
394 {
395 return single->certId;
396 }
397