1 /* $OpenBSD: ocsp_cl.c,v 1.8 2014/10/18 17:20:40 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/x509.h> 72 #include <openssl/x509v3.h> 73 74 /* Utility functions related to sending OCSP requests and extracting 75 * relevant information from the response. 76 */ 77 78 /* Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ 79 * pointer: useful if we want to add extensions. 80 */ 81 OCSP_ONEREQ * 82 OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid) 83 { 84 OCSP_ONEREQ *one = NULL; 85 86 if (!(one = OCSP_ONEREQ_new())) 87 goto err; 88 if (one->reqCert) 89 OCSP_CERTID_free(one->reqCert); 90 one->reqCert = cid; 91 if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one)) 92 goto err; 93 return one; 94 95 err: 96 OCSP_ONEREQ_free(one); 97 return NULL; 98 } 99 100 /* Set requestorName from an X509_NAME structure */ 101 int 102 OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm) 103 { 104 GENERAL_NAME *gen; 105 106 gen = GENERAL_NAME_new(); 107 if (gen == NULL) 108 return 0; 109 if (!X509_NAME_set(&gen->d.directoryName, nm)) { 110 GENERAL_NAME_free(gen); 111 return 0; 112 } 113 gen->type = GEN_DIRNAME; 114 if (req->tbsRequest->requestorName) 115 GENERAL_NAME_free(req->tbsRequest->requestorName); 116 req->tbsRequest->requestorName = gen; 117 return 1; 118 } 119 120 /* Add a certificate to an OCSP request */ 121 int 122 OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert) 123 { 124 OCSP_SIGNATURE *sig; 125 126 if (!req->optionalSignature) 127 req->optionalSignature = OCSP_SIGNATURE_new(); 128 sig = req->optionalSignature; 129 if (!sig) 130 return 0; 131 if (!cert) 132 return 1; 133 if (!sig->certs && !(sig->certs = sk_X509_new_null())) 134 return 0; 135 136 if (!sk_X509_push(sig->certs, cert)) 137 return 0; 138 CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); 139 return 1; 140 } 141 142 /* Sign an OCSP request set the requestorName to the subjec 143 * name of an optional signers certificate and include one 144 * or more optional certificates in the request. Behaves 145 * like PKCS7_sign(). 146 */ 147 int 148 OCSP_request_sign(OCSP_REQUEST *req, X509 *signer, EVP_PKEY *key, 149 const EVP_MD *dgst, STACK_OF(X509) *certs, unsigned long flags) 150 { 151 int i; 152 OCSP_SIGNATURE *sig; 153 X509 *x; 154 155 if (!OCSP_request_set1_name(req, X509_get_subject_name(signer))) 156 goto err; 157 158 if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) 159 goto err; 160 if (key) { 161 if (!X509_check_private_key(signer, key)) { 162 OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, 163 OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 164 goto err; 165 } 166 if (!OCSP_REQUEST_sign(req, key, dgst)) 167 goto err; 168 } 169 170 if (!(flags & OCSP_NOCERTS)) { 171 if (!OCSP_request_add1_cert(req, signer)) 172 goto err; 173 for (i = 0; i < sk_X509_num(certs); i++) { 174 x = sk_X509_value(certs, i); 175 if (!OCSP_request_add1_cert(req, x)) 176 goto err; 177 } 178 } 179 180 return 1; 181 182 err: 183 OCSP_SIGNATURE_free(req->optionalSignature); 184 req->optionalSignature = NULL; 185 return 0; 186 } 187 188 /* Get response status */ 189 int 190 OCSP_response_status(OCSP_RESPONSE *resp) 191 { 192 return ASN1_ENUMERATED_get(resp->responseStatus); 193 } 194 195 /* Extract basic response from OCSP_RESPONSE or NULL if 196 * no basic response present. 197 */ 198 OCSP_BASICRESP * 199 OCSP_response_get1_basic(OCSP_RESPONSE *resp) 200 { 201 OCSP_RESPBYTES *rb; 202 203 rb = resp->responseBytes; 204 if (!rb) { 205 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, 206 OCSP_R_NO_RESPONSE_DATA); 207 return NULL; 208 } 209 if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) { 210 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, 211 OCSP_R_NOT_BASIC_RESPONSE); 212 return NULL; 213 } 214 215 return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP)); 216 } 217 218 /* Return number of OCSP_SINGLERESP reponses present in 219 * a basic response. 220 */ 221 int 222 OCSP_resp_count(OCSP_BASICRESP *bs) 223 { 224 if (!bs) 225 return -1; 226 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses); 227 } 228 229 /* Extract an OCSP_SINGLERESP response with a given index */ 230 OCSP_SINGLERESP * 231 OCSP_resp_get0(OCSP_BASICRESP *bs, int idx) 232 { 233 if (!bs) 234 return NULL; 235 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx); 236 } 237 238 /* Look single response matching a given certificate ID */ 239 int 240 OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last) 241 { 242 int i; 243 STACK_OF(OCSP_SINGLERESP) *sresp; 244 OCSP_SINGLERESP *single; 245 246 if (!bs) 247 return -1; 248 if (last < 0) 249 last = 0; 250 else 251 last++; 252 sresp = bs->tbsResponseData->responses; 253 for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) { 254 single = sk_OCSP_SINGLERESP_value(sresp, i); 255 if (!OCSP_id_cmp(id, single->certId)) 256 return i; 257 } 258 return -1; 259 } 260 261 /* Extract status information from an OCSP_SINGLERESP structure. 262 * Note: the revtime and reason values are only set if the 263 * certificate status is revoked. Returns numerical value of 264 * status. 265 */ 266 int 267 OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, 268 ASN1_GENERALIZEDTIME **revtime, ASN1_GENERALIZEDTIME **thisupd, 269 ASN1_GENERALIZEDTIME **nextupd) 270 { 271 int ret; 272 OCSP_CERTSTATUS *cst; 273 274 if (!single) 275 return -1; 276 cst = single->certStatus; 277 ret = cst->type; 278 if (ret == V_OCSP_CERTSTATUS_REVOKED) { 279 OCSP_REVOKEDINFO *rev = cst->value.revoked; 280 281 if (revtime) 282 *revtime = rev->revocationTime; 283 if (reason) { 284 if (rev->revocationReason) 285 *reason = ASN1_ENUMERATED_get( 286 rev->revocationReason); 287 else 288 *reason = -1; 289 } 290 } 291 if (thisupd) 292 *thisupd = single->thisUpdate; 293 if (nextupd) 294 *nextupd = single->nextUpdate; 295 return ret; 296 } 297 298 /* This function combines the previous ones: look up a certificate ID and 299 * if found extract status information. Return 0 is successful. 300 */ 301 int 302 OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, 303 int *reason, ASN1_GENERALIZEDTIME **revtime, ASN1_GENERALIZEDTIME **thisupd, 304 ASN1_GENERALIZEDTIME **nextupd) 305 { 306 int i; 307 OCSP_SINGLERESP *single; 308 309 i = OCSP_resp_find(bs, id, -1); 310 /* Maybe check for multiple responses and give an error? */ 311 if (i < 0) 312 return 0; 313 single = OCSP_resp_get0(bs, i); 314 i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd); 315 if (status) 316 *status = i; 317 return 1; 318 } 319 320 /* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will 321 * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid 322 * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time. 323 * Also to avoid accepting very old responses without a nextUpdate field an optional maxage 324 * parameter specifies the maximum age the thisUpdate field can be. 325 */ 326 int 327 OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, 328 ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec) 329 { 330 int ret = 1; 331 time_t t_now, t_tmp; 332 333 time(&t_now); 334 /* Check thisUpdate is valid and not more than nsec in the future */ 335 if (!ASN1_GENERALIZEDTIME_check(thisupd)) { 336 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 337 OCSP_R_ERROR_IN_THISUPDATE_FIELD); 338 ret = 0; 339 } else { 340 t_tmp = t_now + nsec; 341 if (X509_cmp_time(thisupd, &t_tmp) > 0) { 342 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 343 OCSP_R_STATUS_NOT_YET_VALID); 344 ret = 0; 345 } 346 347 /* If maxsec specified check thisUpdate is not more than maxsec in the past */ 348 if (maxsec >= 0) { 349 t_tmp = t_now - maxsec; 350 if (X509_cmp_time(thisupd, &t_tmp) < 0) { 351 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 352 OCSP_R_STATUS_TOO_OLD); 353 ret = 0; 354 } 355 } 356 } 357 358 if (!nextupd) 359 return ret; 360 361 /* Check nextUpdate is valid and not more than nsec in the past */ 362 if (!ASN1_GENERALIZEDTIME_check(nextupd)) { 363 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 364 OCSP_R_ERROR_IN_NEXTUPDATE_FIELD); 365 ret = 0; 366 } else { 367 t_tmp = t_now - nsec; 368 if (X509_cmp_time(nextupd, &t_tmp) < 0) { 369 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 370 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