1 /* ocsp_cl.c */ 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 #include <cryptlib.h> 67 #include <openssl/objects.h> 68 #include <openssl/rand.h> 69 #include <openssl/x509.h> 70 #include <openssl/pem.h> 71 #include <openssl/x509v3.h> 72 #include <openssl/ocsp.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 82 OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid) 83 { 84 OCSP_ONEREQ *one = NULL; 85 86 if (!(one = OCSP_ONEREQ_new())) goto err; 87 if (one->reqCert) OCSP_CERTID_free(one->reqCert); 88 one->reqCert = cid; 89 if (req && 90 !sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one)) 91 goto err; 92 return one; 93 err: 94 OCSP_ONEREQ_free(one); 95 return NULL; 96 } 97 98 /* Set requestorName from an X509_NAME structure */ 99 100 int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm) 101 { 102 GENERAL_NAME *gen; 103 gen = GENERAL_NAME_new(); 104 if (gen == NULL) 105 return 0; 106 if (!X509_NAME_set(&gen->d.directoryName, nm)) 107 { 108 GENERAL_NAME_free(gen); 109 return 0; 110 } 111 gen->type = GEN_DIRNAME; 112 if (req->tbsRequest->requestorName) 113 GENERAL_NAME_free(req->tbsRequest->requestorName); 114 req->tbsRequest->requestorName = gen; 115 return 1; 116 } 117 118 119 /* Add a certificate to an OCSP request */ 120 121 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert) 122 { 123 OCSP_SIGNATURE *sig; 124 if (!req->optionalSignature) 125 req->optionalSignature = OCSP_SIGNATURE_new(); 126 sig = req->optionalSignature; 127 if (!sig) return 0; 128 if (!cert) return 1; 129 if (!sig->certs && !(sig->certs = sk_X509_new_null())) 130 return 0; 131 132 if(!sk_X509_push(sig->certs, cert)) return 0; 133 CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); 134 return 1; 135 } 136 137 /* Sign an OCSP request set the requestorName to the subjec 138 * name of an optional signers certificate and include one 139 * or more optional certificates in the request. Behaves 140 * like PKCS7_sign(). 141 */ 142 143 int OCSP_request_sign(OCSP_REQUEST *req, 144 X509 *signer, 145 EVP_PKEY *key, 146 const EVP_MD *dgst, 147 STACK_OF(X509) *certs, 148 unsigned long flags) 149 { 150 int i; 151 OCSP_SIGNATURE *sig; 152 X509 *x; 153 154 if (!OCSP_request_set1_name(req, X509_get_subject_name(signer))) 155 goto err; 156 157 if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) goto err; 158 if (key) 159 { 160 if (!X509_check_private_key(signer, key)) 161 { 162 OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 163 goto err; 164 } 165 if (!OCSP_REQUEST_sign(req, key, dgst)) goto err; 166 } 167 168 if (!(flags & OCSP_NOCERTS)) 169 { 170 if(!OCSP_request_add1_cert(req, signer)) goto err; 171 for (i = 0; i < sk_X509_num(certs); i++) 172 { 173 x = sk_X509_value(certs, i); 174 if (!OCSP_request_add1_cert(req, x)) goto err; 175 } 176 } 177 178 return 1; 179 err: 180 OCSP_SIGNATURE_free(req->optionalSignature); 181 req->optionalSignature = NULL; 182 return 0; 183 } 184 185 /* Get response status */ 186 187 int OCSP_response_status(OCSP_RESPONSE *resp) 188 { 189 return ASN1_ENUMERATED_get(resp->responseStatus); 190 } 191 192 /* Extract basic response from OCSP_RESPONSE or NULL if 193 * no basic response present. 194 */ 195 196 197 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp) 198 { 199 OCSP_RESPBYTES *rb; 200 rb = resp->responseBytes; 201 if (!rb) 202 { 203 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA); 204 return NULL; 205 } 206 if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) 207 { 208 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE); 209 return NULL; 210 } 211 212 return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP)); 213 } 214 215 /* Return number of OCSP_SINGLERESP reponses present in 216 * a basic response. 217 */ 218 219 int OCSP_resp_count(OCSP_BASICRESP *bs) 220 { 221 if (!bs) return -1; 222 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses); 223 } 224 225 /* Extract an OCSP_SINGLERESP response with a given index */ 226 227 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx) 228 { 229 if (!bs) return NULL; 230 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx); 231 } 232 233 /* Look single response matching a given certificate ID */ 234 235 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last) 236 { 237 int i; 238 STACK_OF(OCSP_SINGLERESP) *sresp; 239 OCSP_SINGLERESP *single; 240 if (!bs) return -1; 241 if (last < 0) last = 0; 242 else last++; 243 sresp = bs->tbsResponseData->responses; 244 for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) 245 { 246 single = sk_OCSP_SINGLERESP_value(sresp, i); 247 if (!OCSP_id_cmp(id, single->certId)) return i; 248 } 249 return -1; 250 } 251 252 /* Extract status information from an OCSP_SINGLERESP structure. 253 * Note: the revtime and reason values are only set if the 254 * certificate status is revoked. Returns numerical value of 255 * status. 256 */ 257 258 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, 259 ASN1_GENERALIZEDTIME **revtime, 260 ASN1_GENERALIZEDTIME **thisupd, 261 ASN1_GENERALIZEDTIME **nextupd) 262 { 263 int ret; 264 OCSP_CERTSTATUS *cst; 265 if(!single) return -1; 266 cst = single->certStatus; 267 ret = cst->type; 268 if (ret == V_OCSP_CERTSTATUS_REVOKED) 269 { 270 OCSP_REVOKEDINFO *rev = cst->value.revoked; 271 if (revtime) *revtime = rev->revocationTime; 272 if (reason) 273 { 274 if(rev->revocationReason) 275 *reason = ASN1_ENUMERATED_get(rev->revocationReason); 276 else *reason = -1; 277 } 278 } 279 if(thisupd) *thisupd = single->thisUpdate; 280 if(nextupd) *nextupd = single->nextUpdate; 281 return ret; 282 } 283 284 /* This function combines the previous ones: look up a certificate ID and 285 * if found extract status information. Return 0 is successful. 286 */ 287 288 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, 289 int *reason, 290 ASN1_GENERALIZEDTIME **revtime, 291 ASN1_GENERALIZEDTIME **thisupd, 292 ASN1_GENERALIZEDTIME **nextupd) 293 { 294 int i; 295 OCSP_SINGLERESP *single; 296 i = OCSP_resp_find(bs, id, -1); 297 /* Maybe check for multiple responses and give an error? */ 298 if(i < 0) return 0; 299 single = OCSP_resp_get0(bs, i); 300 i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd); 301 if(status) *status = i; 302 return 1; 303 } 304 305 /* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will 306 * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid 307 * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time. 308 * Also to avoid accepting very old responses without a nextUpdate field an optional maxage 309 * parameter specifies the maximum age the thisUpdate field can be. 310 */ 311 312 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec) 313 { 314 int ret = 1; 315 time_t t_now, t_tmp; 316 time(&t_now); 317 /* Check thisUpdate is valid and not more than nsec in the future */ 318 if (!ASN1_GENERALIZEDTIME_check(thisupd)) 319 { 320 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD); 321 ret = 0; 322 } 323 else 324 { 325 t_tmp = t_now + nsec; 326 if (X509_cmp_time(thisupd, &t_tmp) > 0) 327 { 328 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID); 329 ret = 0; 330 } 331 332 /* If maxsec specified check thisUpdate is not more than maxsec in the past */ 333 if (maxsec >= 0) 334 { 335 t_tmp = t_now - maxsec; 336 if (X509_cmp_time(thisupd, &t_tmp) < 0) 337 { 338 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD); 339 ret = 0; 340 } 341 } 342 } 343 344 345 if (!nextupd) return ret; 346 347 /* Check nextUpdate is valid and not more than nsec in the past */ 348 if (!ASN1_GENERALIZEDTIME_check(nextupd)) 349 { 350 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD); 351 ret = 0; 352 } 353 else 354 { 355 t_tmp = t_now - nsec; 356 if (X509_cmp_time(nextupd, &t_tmp) < 0) 357 { 358 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED); 359 ret = 0; 360 } 361 } 362 363 /* Also don't allow nextUpdate to precede thisUpdate */ 364 if (ASN1_STRING_cmp(nextupd, thisupd) < 0) 365 { 366 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE); 367 ret = 0; 368 } 369 370 return ret; 371 } 372