crypto/ocsp/ocsp_cl.c

   1 /*
   2  * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <time.h>
  12 #include "internal/cryptlib.h"
  13 #include <openssl/objects.h>
  14 #include <openssl/x509.h>
  15 #include <openssl/pem.h>
  16 #include <openssl/x509v3.h>
  17 #include <openssl/ocsp.h>
  18 #include "ocsp_lcl.h"
  19
  20 /*
  21  * Utility functions related to sending OCSP requests and extracting relevant
  22  * information from the response.
  23  */
  24
  25 /*
  26  * Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ pointer:
  27  * useful if we want to add extensions.
  28  */
  29
  30 OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)
  31 {
  32     OCSP_ONEREQ *one = NULL;
  33
  34     if ((one = OCSP_ONEREQ_new()) == NULL)
  35         return NULL;
  36     OCSP_CERTID_free(one->reqCert);
  37     one->reqCert = cid;
  38     if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest.requestList, one)) {
  39         one->reqCert = NULL; /* do not free on error */
  40         goto err;
  41     }
  42     return one;
  43  err:
  44     OCSP_ONEREQ_free(one);
  45     return NULL;
  46 }
  47
  48 /* Set requestorName from an X509_NAME structure */
  49
  50 int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm)
  51 {
  52     GENERAL_NAME *gen;
  53
  54     gen = GENERAL_NAME_new();
  55     if (gen == NULL)
  56         return 0;
  57     if (!X509_NAME_set(&gen->d.directoryName, nm)) {
  58         GENERAL_NAME_free(gen);
  59         return 0;
  60     }
  61     gen->type = GEN_DIRNAME;
  62     GENERAL_NAME_free(req->tbsRequest.requestorName);
  63     req->tbsRequest.requestorName = gen;
  64     return 1;
  65 }
  66
  67 /* Add a certificate to an OCSP request */
  68
  69 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)
  70 {
  71     OCSP_SIGNATURE *sig;
  72     if (req->optionalSignature == NULL)
  73         req->optionalSignature = OCSP_SIGNATURE_new();
  74     sig = req->optionalSignature;
  75     if (sig == NULL)
  76         return 0;
  77     if (cert == NULL)
  78         return 1;
  79     if (sig->certs == NULL
  80         && (sig->certs = sk_X509_new_null()) == NULL)
  81         return 0;
  82
  83     if (!sk_X509_push(sig->certs, cert))
  84         return 0;
  85     X509_up_ref(cert);
  86     return 1;
  87 }
  88
  89 /*
  90  * Sign an OCSP request set the requestorName to the subject name of an
  91  * optional signers certificate and include one or more optional certificates
  92  * in the request. Behaves like PKCS7_sign().
  93  */
  94
  95 int OCSP_request_sign(OCSP_REQUEST *req,
  96                       X509 *signer,
  97                       EVP_PKEY *key,
  98                       const EVP_MD *dgst,
  99                       STACK_OF(X509) *certs, unsigned long flags)
 100 {
 101     int i;
 102     X509 *x;
 103
 104     if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))
 105         goto err;
 106
 107     if ((req->optionalSignature = OCSP_SIGNATURE_new()) == NULL)
 108         goto err;
 109     if (key) {
 110         if (!X509_check_private_key(signer, key)) {
 111             OCSPerr(OCSP_F_OCSP_REQUEST_SIGN,
 112                     OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 113             goto err;
 114         }
 115         if (!OCSP_REQUEST_sign(req, key, dgst))
 116             goto err;
 117     }
 118
 119     if (!(flags & OCSP_NOCERTS)) {
 120         if (!OCSP_request_add1_cert(req, signer))
 121             goto err;
 122         for (i = 0; i < sk_X509_num(certs); i++) {
 123             x = sk_X509_value(certs, i);
 124             if (!OCSP_request_add1_cert(req, x))
 125                 goto err;
 126         }
 127     }
 128
 129     return 1;
 130  err:
 131     OCSP_SIGNATURE_free(req->optionalSignature);
 132     req->optionalSignature = NULL;
 133     return 0;
 134 }
 135
 136 /* Get response status */
 137
 138 int OCSP_response_status(OCSP_RESPONSE *resp)
 139 {
 140     return ASN1_ENUMERATED_get(resp->responseStatus);
 141 }
 142
 143 /*
 144  * Extract basic response from OCSP_RESPONSE or NULL if no basic response
 145  * present.
 146  */
 147
 148 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)
 149 {
 150     OCSP_RESPBYTES *rb;
 151     rb = resp->responseBytes;
 152     if (!rb) {
 153         OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);
 154         return NULL;
 155     }
 156     if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) {
 157         OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);
 158         return NULL;
 159     }
 160
 161     return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));
 162 }
 163
 164 ASN1_OCTET_STRING *OCSP_resp_get0_signature(OCSP_BASICRESP *bs)
 165 {
 166     return bs->signature;
 167 }
 168
 169 /*
 170  * Return number of OCSP_SINGLERESP responses present in a basic response.
 171  */
 172
 173 int OCSP_resp_count(OCSP_BASICRESP *bs)
 174 {
 175     if (!bs)
 176         return -1;
 177     return sk_OCSP_SINGLERESP_num(bs->tbsResponseData.responses);
 178 }
 179
 180 /* Extract an OCSP_SINGLERESP response with a given index */
 181
 182 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)
 183 {
 184     if (!bs)
 185         return NULL;
 186     return sk_OCSP_SINGLERESP_value(bs->tbsResponseData.responses, idx);
 187 }
 188
 189 ASN1_GENERALIZEDTIME *OCSP_resp_get0_produced_at(OCSP_BASICRESP* bs)
 190 {
 191     if (!bs)
 192         return NULL;
 193     return bs->tbsResponseData.producedAt;
 194 }
 195
 196 const STACK_OF(X509) *OCSP_resp_get0_certs(const OCSP_BASICRESP *bs)
 197 {
 198     return bs->certs;
 199 }
 200
 201 int OCSP_resp_get0_id(const OCSP_BASICRESP *bs,
 202                       const ASN1_OCTET_STRING **pid,
 203                       const X509_NAME **pname)
 204
 205 {
 206     const OCSP_RESPID *rid = &bs->tbsResponseData.responderId;
 207     if (rid->type == V_OCSP_RESPID_NAME) {
 208         *pname = rid->value.byName;
 209         *pid = NULL;
 210     } else if (rid->type == V_OCSP_RESPID_KEY) {
 211         *pid = rid->value.byKey;
 212         *pname = NULL;
 213     } else {
 214         return 0;
 215     }
 216     return 1;
 217 }
 218
 219 /* Look single response matching a given certificate ID */
 220
 221 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)
 222 {
 223     int i;
 224     STACK_OF(OCSP_SINGLERESP) *sresp;
 225     OCSP_SINGLERESP *single;
 226     if (!bs)
 227         return -1;
 228     if (last < 0)
 229         last = 0;
 230     else
 231         last++;
 232     sresp = bs->tbsResponseData.responses;
 233     for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
 234         single = sk_OCSP_SINGLERESP_value(sresp, i);
 235         if (!OCSP_id_cmp(id, single->certId))
 236             return i;
 237     }
 238     return -1;
 239 }
 240
 241 /*
 242  * Extract status information from an OCSP_SINGLERESP structure. Note: the
 243  * revtime and reason values are only set if the certificate status is
 244  * revoked. Returns numerical value of status.
 245  */
 246
 247 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
 248                             ASN1_GENERALIZEDTIME **revtime,
 249                             ASN1_GENERALIZEDTIME **thisupd,
 250                             ASN1_GENERALIZEDTIME **nextupd)
 251 {
 252     int ret;
 253     OCSP_CERTSTATUS *cst;
 254     if (!single)
 255         return -1;
 256     cst = single->certStatus;
 257     ret = cst->type;
 258     if (ret == V_OCSP_CERTSTATUS_REVOKED) {
 259         OCSP_REVOKEDINFO *rev = cst->value.revoked;
 260         if (revtime)
 261             *revtime = rev->revocationTime;
 262         if (reason) {
 263             if (rev->revocationReason)
 264                 *reason = ASN1_ENUMERATED_get(rev->revocationReason);
 265             else
 266                 *reason = -1;
 267         }
 268     }
 269     if (thisupd)
 270         *thisupd = single->thisUpdate;
 271     if (nextupd)
 272         *nextupd = single->nextUpdate;
 273     return ret;
 274 }
 275
 276 /*
 277  * This function combines the previous ones: look up a certificate ID and if
 278  * found extract status information. Return 0 is successful.
 279  */
 280
 281 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
 282                           int *reason,
 283                           ASN1_GENERALIZEDTIME **revtime,
 284                           ASN1_GENERALIZEDTIME **thisupd,
 285                           ASN1_GENERALIZEDTIME **nextupd)
 286 {
 287     int i;
 288     OCSP_SINGLERESP *single;
 289     i = OCSP_resp_find(bs, id, -1);
 290     /* Maybe check for multiple responses and give an error? */
 291     if (i < 0)
 292         return 0;
 293     single = OCSP_resp_get0(bs, i);
 294     i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);
 295     if (status)
 296         *status = i;
 297     return 1;
 298 }
 299
 300 /*
 301  * Check validity of thisUpdate and nextUpdate fields. It is possible that
 302  * the request will take a few seconds to process and/or the time wont be
 303  * totally accurate. Therefore to avoid rejecting otherwise valid time we
 304  * allow the times to be within 'nsec' of the current time. Also to avoid
 305  * accepting very old responses without a nextUpdate field an optional maxage
 306  * parameter specifies the maximum age the thisUpdate field can be.
 307  */
 308
 309 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd,
 310                         ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)
 311 {
 312     int ret = 1;
 313     time_t t_now, t_tmp;
 314     time(&t_now);
 315     /* Check thisUpdate is valid and not more than nsec in the future */
 316     if (!ASN1_GENERALIZEDTIME_check(thisupd)) {
 317         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);
 318         ret = 0;
 319     } else {
 320         t_tmp = t_now + nsec;
 321         if (X509_cmp_time(thisupd, &t_tmp) > 0) {
 322             OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);
 323             ret = 0;
 324         }
 325
 326         /*
 327          * If maxsec specified check thisUpdate is not more than maxsec in
 328          * the past
 329          */
 330         if (maxsec >= 0) {
 331             t_tmp = t_now - maxsec;
 332             if (X509_cmp_time(thisupd, &t_tmp) < 0) {
 333                 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);
 334                 ret = 0;
 335             }
 336         }
 337     }
 338
 339     if (!nextupd)
 340         return ret;
 341
 342     /* Check nextUpdate is valid and not more than nsec in the past */
 343     if (!ASN1_GENERALIZEDTIME_check(nextupd)) {
 344         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);
 345         ret = 0;
 346     } else {
 347         t_tmp = t_now - nsec;
 348         if (X509_cmp_time(nextupd, &t_tmp) < 0) {
 349             OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);
 350             ret = 0;
 351         }
 352     }
 353
 354     /* Also don't allow nextUpdate to precede thisUpdate */
 355     if (ASN1_STRING_cmp(nextupd, thisupd) < 0) {
 356         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY,
 357                 OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);
 358         ret = 0;
 359     }
 360
 361     return ret;
 362 }
 363
 364 OCSP_CERTID *OCSP_SINGLERESP_get0_id(OCSP_SINGLERESP *single)
 365 {
 366     return single->certId;
 367 }