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 (!X509_NAME_set(&gen->d.directoryName, nm)) 105 { 106 GENERAL_NAME_free(gen); 107 return 0; 108 } 109 gen->type = GEN_DIRNAME; 110 if (req->tbsRequest->requestorName) 111 GENERAL_NAME_free(req->tbsRequest->requestorName); 112 req->tbsRequest->requestorName = gen; 113 return 1; 114 } 115 116 117 /* Add a certificate to an OCSP request */ 118 119 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert) 120 { 121 OCSP_SIGNATURE *sig; 122 if (!req->optionalSignature) 123 req->optionalSignature = OCSP_SIGNATURE_new(); 124 sig = req->optionalSignature; 125 if (!sig) return 0; 126 if (!cert) return 1; 127 if (!sig->certs && !(sig->certs = sk_X509_new_null())) 128 return 0; 129 130 if(!sk_X509_push(sig->certs, cert)) return 0; 131 CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); 132 return 1; 133 } 134 135 /* Sign an OCSP request set the requestorName to the subjec 136 * name of an optional signers certificate and include one 137 * or more optional certificates in the request. Behaves 138 * like PKCS7_sign(). 139 */ 140 141 int OCSP_request_sign(OCSP_REQUEST *req, 142 X509 *signer, 143 EVP_PKEY *key, 144 const EVP_MD *dgst, 145 STACK_OF(X509) *certs, 146 unsigned long flags) 147 { 148 int i; 149 OCSP_SIGNATURE *sig; 150 X509 *x; 151 152 if (!OCSP_request_set1_name(req, X509_get_subject_name(signer))) 153 goto err; 154 155 if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) goto err; 156 if (!dgst) dgst = EVP_sha1(); 157 if (key) 158 { 159 if (!X509_check_private_key(signer, key)) 160 { 161 OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 162 goto err; 163 } 164 if (!OCSP_REQUEST_sign(req, key, dgst)) goto err; 165 } 166 167 if (!(flags & OCSP_NOCERTS)) 168 { 169 if(!OCSP_request_add1_cert(req, signer)) goto err; 170 for (i = 0; i < sk_X509_num(certs); i++) 171 { 172 x = sk_X509_value(certs, i); 173 if (!OCSP_request_add1_cert(req, x)) goto err; 174 } 175 } 176 177 return 1; 178 err: 179 OCSP_SIGNATURE_free(req->optionalSignature); 180 req->optionalSignature = NULL; 181 return 0; 182 } 183 184 /* Get response status */ 185 186 int OCSP_response_status(OCSP_RESPONSE *resp) 187 { 188 return ASN1_ENUMERATED_get(resp->responseStatus); 189 } 190 191 /* Extract basic response from OCSP_RESPONSE or NULL if 192 * no basic response present. 193 */ 194 195 196 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp) 197 { 198 OCSP_RESPBYTES *rb; 199 rb = resp->responseBytes; 200 if (!rb) 201 { 202 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA); 203 return NULL; 204 } 205 if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) 206 { 207 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE); 208 return NULL; 209 } 210 211 return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP)); 212 } 213 214 /* Return number of OCSP_SINGLERESP reponses present in 215 * a basic response. 216 */ 217 218 int OCSP_resp_count(OCSP_BASICRESP *bs) 219 { 220 if (!bs) return -1; 221 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses); 222 } 223 224 /* Extract an OCSP_SINGLERESP response with a given index */ 225 226 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx) 227 { 228 if (!bs) return NULL; 229 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx); 230 } 231 232 /* Look single response matching a given certificate ID */ 233 234 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last) 235 { 236 int i; 237 STACK_OF(OCSP_SINGLERESP) *sresp; 238 OCSP_SINGLERESP *single; 239 if (!bs) return -1; 240 if (last < 0) last = 0; 241 else last++; 242 sresp = bs->tbsResponseData->responses; 243 for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) 244 { 245 single = sk_OCSP_SINGLERESP_value(sresp, i); 246 if (!OCSP_id_cmp(id, single->certId)) return i; 247 } 248 return -1; 249 } 250 251 /* Extract status information from an OCSP_SINGLERESP structure. 252 * Note: the revtime and reason values are only set if the 253 * certificate status is revoked. Returns numerical value of 254 * status. 255 */ 256 257 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, 258 ASN1_GENERALIZEDTIME **revtime, 259 ASN1_GENERALIZEDTIME **thisupd, 260 ASN1_GENERALIZEDTIME **nextupd) 261 { 262 int ret; 263 OCSP_CERTSTATUS *cst; 264 if(!single) return -1; 265 cst = single->certStatus; 266 ret = cst->type; 267 if (ret == V_OCSP_CERTSTATUS_REVOKED) 268 { 269 OCSP_REVOKEDINFO *rev = cst->value.revoked; 270 if (revtime) *revtime = rev->revocationTime; 271 if (reason) 272 { 273 if(rev->revocationReason) 274 *reason = ASN1_ENUMERATED_get(rev->revocationReason); 275 else *reason = -1; 276 } 277 } 278 if(thisupd) *thisupd = single->thisUpdate; 279 if(nextupd) *nextupd = single->nextUpdate; 280 return ret; 281 } 282 283 /* This function combines the previous ones: look up a certificate ID and 284 * if found extract status information. Return 0 is successful. 285 */ 286 287 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, 288 int *reason, 289 ASN1_GENERALIZEDTIME **revtime, 290 ASN1_GENERALIZEDTIME **thisupd, 291 ASN1_GENERALIZEDTIME **nextupd) 292 { 293 int i; 294 OCSP_SINGLERESP *single; 295 i = OCSP_resp_find(bs, id, -1); 296 /* Maybe check for multiple responses and give an error? */ 297 if(i < 0) return 0; 298 single = OCSP_resp_get0(bs, i); 299 i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd); 300 if(status) *status = i; 301 return 1; 302 } 303 304 /* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will 305 * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid 306 * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time. 307 * Also to avoid accepting very old responses without a nextUpdate field an optional maxage 308 * parameter specifies the maximum age the thisUpdate field can be. 309 */ 310 311 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec) 312 { 313 int ret = 1; 314 time_t t_now, t_tmp; 315 time(&t_now); 316 /* Check thisUpdate is valid and not more than nsec in the future */ 317 if (!ASN1_GENERALIZEDTIME_check(thisupd)) 318 { 319 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD); 320 ret = 0; 321 } 322 else 323 { 324 t_tmp = t_now + nsec; 325 if (X509_cmp_time(thisupd, &t_tmp) > 0) 326 { 327 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID); 328 ret = 0; 329 } 330 331 /* If maxsec specified check thisUpdate is not more than maxsec in the past */ 332 if (maxsec >= 0) 333 { 334 t_tmp = t_now - maxsec; 335 if (X509_cmp_time(thisupd, &t_tmp) < 0) 336 { 337 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD); 338 ret = 0; 339 } 340 } 341 } 342 343 344 if (!nextupd) return ret; 345 346 /* Check nextUpdate is valid and not more than nsec in the past */ 347 if (!ASN1_GENERALIZEDTIME_check(nextupd)) 348 { 349 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD); 350 ret = 0; 351 } 352 else 353 { 354 t_tmp = t_now - nsec; 355 if (X509_cmp_time(nextupd, &t_tmp) < 0) 356 { 357 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED); 358 ret = 0; 359 } 360 } 361 362 /* Also don't allow nextUpdate to precede thisUpdate */ 363 if (ASN1_STRING_cmp(nextupd, thisupd) < 0) 364 { 365 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE); 366 ret = 0; 367 } 368 369 return ret; 370 } 371