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 (!dgst) dgst = EVP_sha1(); 159 if (key) 160 { 161 if (!X509_check_private_key(signer, key)) 162 { 163 OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 164 goto err; 165 } 166 if (!OCSP_REQUEST_sign(req, key, dgst)) goto err; 167 } 168 169 if (!(flags & OCSP_NOCERTS)) 170 { 171 if(!OCSP_request_add1_cert(req, signer)) goto err; 172 for (i = 0; i < sk_X509_num(certs); i++) 173 { 174 x = sk_X509_value(certs, i); 175 if (!OCSP_request_add1_cert(req, x)) goto err; 176 } 177 } 178 179 return 1; 180 err: 181 OCSP_SIGNATURE_free(req->optionalSignature); 182 req->optionalSignature = NULL; 183 return 0; 184 } 185 186 /* Get response status */ 187 188 int OCSP_response_status(OCSP_RESPONSE *resp) 189 { 190 return ASN1_ENUMERATED_get(resp->responseStatus); 191 } 192 193 /* Extract basic response from OCSP_RESPONSE or NULL if 194 * no basic response present. 195 */ 196 197 198 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp) 199 { 200 OCSP_RESPBYTES *rb; 201 rb = resp->responseBytes; 202 if (!rb) 203 { 204 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA); 205 return NULL; 206 } 207 if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) 208 { 209 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE); 210 return NULL; 211 } 212 213 return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP)); 214 } 215 216 /* Return number of OCSP_SINGLERESP reponses present in 217 * a basic response. 218 */ 219 220 int OCSP_resp_count(OCSP_BASICRESP *bs) 221 { 222 if (!bs) return -1; 223 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses); 224 } 225 226 /* Extract an OCSP_SINGLERESP response with a given index */ 227 228 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx) 229 { 230 if (!bs) return NULL; 231 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx); 232 } 233 234 /* Look single response matching a given certificate ID */ 235 236 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last) 237 { 238 int i; 239 STACK_OF(OCSP_SINGLERESP) *sresp; 240 OCSP_SINGLERESP *single; 241 if (!bs) return -1; 242 if (last < 0) last = 0; 243 else last++; 244 sresp = bs->tbsResponseData->responses; 245 for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) 246 { 247 single = sk_OCSP_SINGLERESP_value(sresp, i); 248 if (!OCSP_id_cmp(id, single->certId)) return i; 249 } 250 return -1; 251 } 252 253 /* Extract status information from an OCSP_SINGLERESP structure. 254 * Note: the revtime and reason values are only set if the 255 * certificate status is revoked. Returns numerical value of 256 * status. 257 */ 258 259 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, 260 ASN1_GENERALIZEDTIME **revtime, 261 ASN1_GENERALIZEDTIME **thisupd, 262 ASN1_GENERALIZEDTIME **nextupd) 263 { 264 int ret; 265 OCSP_CERTSTATUS *cst; 266 if(!single) return -1; 267 cst = single->certStatus; 268 ret = cst->type; 269 if (ret == V_OCSP_CERTSTATUS_REVOKED) 270 { 271 OCSP_REVOKEDINFO *rev = cst->value.revoked; 272 if (revtime) *revtime = rev->revocationTime; 273 if (reason) 274 { 275 if(rev->revocationReason) 276 *reason = ASN1_ENUMERATED_get(rev->revocationReason); 277 else *reason = -1; 278 } 279 } 280 if(thisupd) *thisupd = single->thisUpdate; 281 if(nextupd) *nextupd = single->nextUpdate; 282 return ret; 283 } 284 285 /* This function combines the previous ones: look up a certificate ID and 286 * if found extract status information. Return 0 is successful. 287 */ 288 289 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, 290 int *reason, 291 ASN1_GENERALIZEDTIME **revtime, 292 ASN1_GENERALIZEDTIME **thisupd, 293 ASN1_GENERALIZEDTIME **nextupd) 294 { 295 int i; 296 OCSP_SINGLERESP *single; 297 i = OCSP_resp_find(bs, id, -1); 298 /* Maybe check for multiple responses and give an error? */ 299 if(i < 0) return 0; 300 single = OCSP_resp_get0(bs, i); 301 i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd); 302 if(status) *status = i; 303 return 1; 304 } 305 306 /* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will 307 * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid 308 * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time. 309 * Also to avoid accepting very old responses without a nextUpdate field an optional maxage 310 * parameter specifies the maximum age the thisUpdate field can be. 311 */ 312 313 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec) 314 { 315 int ret = 1; 316 time_t t_now, t_tmp; 317 time(&t_now); 318 /* Check thisUpdate is valid and not more than nsec in the future */ 319 if (!ASN1_GENERALIZEDTIME_check(thisupd)) 320 { 321 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD); 322 ret = 0; 323 } 324 else 325 { 326 t_tmp = t_now + nsec; 327 if (X509_cmp_time(thisupd, &t_tmp) > 0) 328 { 329 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID); 330 ret = 0; 331 } 332 333 /* If maxsec specified check thisUpdate is not more than maxsec in the past */ 334 if (maxsec >= 0) 335 { 336 t_tmp = t_now - maxsec; 337 if (X509_cmp_time(thisupd, &t_tmp) < 0) 338 { 339 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD); 340 ret = 0; 341 } 342 } 343 } 344 345 346 if (!nextupd) return ret; 347 348 /* Check nextUpdate is valid and not more than nsec in the past */ 349 if (!ASN1_GENERALIZEDTIME_check(nextupd)) 350 { 351 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD); 352 ret = 0; 353 } 354 else 355 { 356 t_tmp = t_now - nsec; 357 if (X509_cmp_time(nextupd, &t_tmp) < 0) 358 { 359 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED); 360 ret = 0; 361 } 362 } 363 364 /* Also don't allow nextUpdate to precede thisUpdate */ 365 if (ASN1_STRING_cmp(nextupd, thisupd) < 0) 366 { 367 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE); 368 ret = 0; 369 } 370 371 return ret; 372 } 373