1 /* $OpenBSD: ocsp_cl.c,v 1.7 2014/07/11 08:44:49 jsing Exp $ */ 2 /* Written by Tom Titchener <Tom_Titchener@groove.net> for the OpenSSL 3 * project. */ 4 5 /* History: 6 This file was transfered to Richard Levitte from CertCo by Kathy 7 Weinhold in mid-spring 2000 to be included in OpenSSL or released 8 as a patch kit. */ 9 10 /* ==================================================================== 11 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in 22 * the documentation and/or other materials provided with the 23 * distribution. 24 * 25 * 3. All advertising materials mentioning features or use of this 26 * software must display the following acknowledgment: 27 * "This product includes software developed by the OpenSSL Project 28 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 29 * 30 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 31 * endorse or promote products derived from this software without 32 * prior written permission. For written permission, please contact 33 * openssl-core@openssl.org. 34 * 35 * 5. Products derived from this software may not be called "OpenSSL" 36 * nor may "OpenSSL" appear in their names without prior written 37 * permission of the OpenSSL Project. 38 * 39 * 6. Redistributions of any form whatsoever must retain the following 40 * acknowledgment: 41 * "This product includes software developed by the OpenSSL Project 42 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 43 * 44 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 45 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 47 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 48 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 49 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 50 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 51 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 53 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 54 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 55 * OF THE POSSIBILITY OF SUCH DAMAGE. 56 * ==================================================================== 57 * 58 * This product includes cryptographic software written by Eric Young 59 * (eay@cryptsoft.com). This product includes software written by Tim 60 * Hudson (tjh@cryptsoft.com). 61 * 62 */ 63 64 #include <stdio.h> 65 #include <time.h> 66 67 #include <openssl/err.h> 68 #include <openssl/ocsp.h> 69 #include <openssl/objects.h> 70 #include <openssl/pem.h> 71 #include <openssl/rand.h> 72 #include <openssl/x509.h> 73 #include <openssl/x509v3.h> 74 75 /* Utility functions related to sending OCSP requests and extracting 76 * relevant information from the response. 77 */ 78 79 /* Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ 80 * pointer: useful if we want to add extensions. 81 */ 82 OCSP_ONEREQ * 83 OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid) 84 { 85 OCSP_ONEREQ *one = NULL; 86 87 if (!(one = OCSP_ONEREQ_new())) 88 goto err; 89 if (one->reqCert) 90 OCSP_CERTID_free(one->reqCert); 91 one->reqCert = cid; 92 if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one)) 93 goto err; 94 return one; 95 96 err: 97 OCSP_ONEREQ_free(one); 98 return NULL; 99 } 100 101 /* Set requestorName from an X509_NAME structure */ 102 int 103 OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm) 104 { 105 GENERAL_NAME *gen; 106 107 gen = GENERAL_NAME_new(); 108 if (gen == NULL) 109 return 0; 110 if (!X509_NAME_set(&gen->d.directoryName, nm)) { 111 GENERAL_NAME_free(gen); 112 return 0; 113 } 114 gen->type = GEN_DIRNAME; 115 if (req->tbsRequest->requestorName) 116 GENERAL_NAME_free(req->tbsRequest->requestorName); 117 req->tbsRequest->requestorName = gen; 118 return 1; 119 } 120 121 /* Add a certificate to an OCSP request */ 122 int 123 OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert) 124 { 125 OCSP_SIGNATURE *sig; 126 127 if (!req->optionalSignature) 128 req->optionalSignature = OCSP_SIGNATURE_new(); 129 sig = req->optionalSignature; 130 if (!sig) 131 return 0; 132 if (!cert) 133 return 1; 134 if (!sig->certs && !(sig->certs = sk_X509_new_null())) 135 return 0; 136 137 if (!sk_X509_push(sig->certs, cert)) 138 return 0; 139 CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); 140 return 1; 141 } 142 143 /* Sign an OCSP request set the requestorName to the subjec 144 * name of an optional signers certificate and include one 145 * or more optional certificates in the request. Behaves 146 * like PKCS7_sign(). 147 */ 148 int 149 OCSP_request_sign(OCSP_REQUEST *req, X509 *signer, EVP_PKEY *key, 150 const EVP_MD *dgst, STACK_OF(X509) *certs, unsigned long flags) 151 { 152 int i; 153 OCSP_SIGNATURE *sig; 154 X509 *x; 155 156 if (!OCSP_request_set1_name(req, X509_get_subject_name(signer))) 157 goto err; 158 159 if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) 160 goto err; 161 if (key) { 162 if (!X509_check_private_key(signer, key)) { 163 OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, 164 OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 165 goto err; 166 } 167 if (!OCSP_REQUEST_sign(req, key, dgst)) 168 goto err; 169 } 170 171 if (!(flags & OCSP_NOCERTS)) { 172 if (!OCSP_request_add1_cert(req, signer)) 173 goto err; 174 for (i = 0; i < sk_X509_num(certs); i++) { 175 x = sk_X509_value(certs, i); 176 if (!OCSP_request_add1_cert(req, x)) 177 goto err; 178 } 179 } 180 181 return 1; 182 183 err: 184 OCSP_SIGNATURE_free(req->optionalSignature); 185 req->optionalSignature = NULL; 186 return 0; 187 } 188 189 /* Get response status */ 190 int 191 OCSP_response_status(OCSP_RESPONSE *resp) 192 { 193 return ASN1_ENUMERATED_get(resp->responseStatus); 194 } 195 196 /* Extract basic response from OCSP_RESPONSE or NULL if 197 * no basic response present. 198 */ 199 OCSP_BASICRESP * 200 OCSP_response_get1_basic(OCSP_RESPONSE *resp) 201 { 202 OCSP_RESPBYTES *rb; 203 204 rb = resp->responseBytes; 205 if (!rb) { 206 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, 207 OCSP_R_NO_RESPONSE_DATA); 208 return NULL; 209 } 210 if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) { 211 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, 212 OCSP_R_NOT_BASIC_RESPONSE); 213 return NULL; 214 } 215 216 return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP)); 217 } 218 219 /* Return number of OCSP_SINGLERESP reponses present in 220 * a basic response. 221 */ 222 int 223 OCSP_resp_count(OCSP_BASICRESP *bs) 224 { 225 if (!bs) 226 return -1; 227 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses); 228 } 229 230 /* Extract an OCSP_SINGLERESP response with a given index */ 231 OCSP_SINGLERESP * 232 OCSP_resp_get0(OCSP_BASICRESP *bs, int idx) 233 { 234 if (!bs) 235 return NULL; 236 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx); 237 } 238 239 /* Look single response matching a given certificate ID */ 240 int 241 OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last) 242 { 243 int i; 244 STACK_OF(OCSP_SINGLERESP) *sresp; 245 OCSP_SINGLERESP *single; 246 247 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 /* Extract status information from an OCSP_SINGLERESP structure. 263 * Note: the revtime and reason values are only set if the 264 * certificate status is revoked. Returns numerical value of 265 * status. 266 */ 267 int 268 OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, 269 ASN1_GENERALIZEDTIME **revtime, ASN1_GENERALIZEDTIME **thisupd, 270 ASN1_GENERALIZEDTIME **nextupd) 271 { 272 int ret; 273 OCSP_CERTSTATUS *cst; 274 275 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; 281 282 if (revtime) 283 *revtime = rev->revocationTime; 284 if (reason) { 285 if (rev->revocationReason) 286 *reason = ASN1_ENUMERATED_get( 287 rev->revocationReason); 288 else 289 *reason = -1; 290 } 291 } 292 if (thisupd) 293 *thisupd = single->thisUpdate; 294 if (nextupd) 295 *nextupd = single->nextUpdate; 296 return ret; 297 } 298 299 /* This function combines the previous ones: look up a certificate ID and 300 * if found extract status information. Return 0 is successful. 301 */ 302 int 303 OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, 304 int *reason, ASN1_GENERALIZEDTIME **revtime, ASN1_GENERALIZEDTIME **thisupd, 305 ASN1_GENERALIZEDTIME **nextupd) 306 { 307 int i; 308 OCSP_SINGLERESP *single; 309 310 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 /* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will 322 * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid 323 * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time. 324 * Also to avoid accepting very old responses without a nextUpdate field an optional maxage 325 * parameter specifies the maximum age the thisUpdate field can be. 326 */ 327 int 328 OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, 329 ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec) 330 { 331 int ret = 1; 332 time_t t_now, t_tmp; 333 334 time(&t_now); 335 /* Check thisUpdate is valid and not more than nsec in the future */ 336 if (!ASN1_GENERALIZEDTIME_check(thisupd)) { 337 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 338 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, 344 OCSP_R_STATUS_NOT_YET_VALID); 345 ret = 0; 346 } 347 348 /* If maxsec specified check thisUpdate is not more than maxsec in the past */ 349 if (maxsec >= 0) { 350 t_tmp = t_now - maxsec; 351 if (X509_cmp_time(thisupd, &t_tmp) < 0) { 352 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 353 OCSP_R_STATUS_TOO_OLD); 354 ret = 0; 355 } 356 } 357 } 358 359 if (!nextupd) 360 return ret; 361 362 /* Check nextUpdate is valid and not more than nsec in the past */ 363 if (!ASN1_GENERALIZEDTIME_check(nextupd)) { 364 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 365 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, 371 OCSP_R_STATUS_EXPIRED); 372 ret = 0; 373 } 374 } 375 376 /* Also don't allow nextUpdate to precede thisUpdate */ 377 if (ASN1_STRING_cmp(nextupd, thisupd) < 0) { 378 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 379 OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE); 380 ret = 0; 381 } 382 383 return ret; 384 } 385