Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | } |