crypto/ocsp/ocsp_lib.c

   1 /* ocsp_lib.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 <cryptlib.h>
  66 #include <openssl/objects.h>
  67 #include <openssl/rand.h>
  68 #include <openssl/x509.h>
  69 #include <openssl/pem.h>
  70 #include <openssl/x509v3.h>
  71 #include <openssl/ocsp.h>
  72
  73 /* Convert a certificate and its issuer to an OCSP_CERTID */
  74
  75 OCSP_CERTID *OCSP_cert_to_id(const EVP_MD *dgst, X509 *subject, X509 *issuer)
  76 {
  77         X509_NAME *iname;
  78         ASN1_INTEGER *serial;
  79         ASN1_BIT_STRING *ikey;
  80 #ifndef NO_SHA1
  81         if(!dgst) dgst = EVP_sha1();
  82 #endif
  83         iname = X509_get_issuer_name(subject);
  84         serial = X509_get_serialNumber(subject);
  85         ikey = issuer->cert_info->key->public_key;
  86         return OCSP_cert_id_new(dgst, iname, ikey, serial);
  87 }
  88
  89
  90 OCSP_CERTID *OCSP_cert_id_new(const EVP_MD *dgst,
  91                               X509_NAME *issuerName,
  92                               ASN1_BIT_STRING* issuerKey,
  93                               ASN1_INTEGER *serialNumber)
  94         {
  95         int nid;
  96         unsigned int i;
  97         X509_ALGOR *alg;
  98         OCSP_CERTID *cid = NULL;
  99         unsigned char md[EVP_MAX_MD_SIZE];
 100         EVP_MD_CTX ctx;
 101
 102         if (!(cid = OCSP_CERTID_new())) goto err;
 103
 104         alg = cid->hashAlgorithm;
 105         if (alg->algorithm != NULL) ASN1_OBJECT_free(alg->algorithm);
 106         if ((nid = EVP_MD_type(dgst)) == NID_undef)
 107                 {
 108                 OCSPerr(OCSP_F_CERT_ID_NEW,OCSP_R_UNKNOWN_NID);
 109                 goto err;
 110                 }
 111         if (!(alg->algorithm=OBJ_nid2obj(nid))) goto err;
 112         if ((alg->parameter=ASN1_TYPE_new()) == NULL) goto err;
 113         alg->parameter->type=V_ASN1_NULL;
 114
 115         if (!X509_NAME_digest(issuerName, dgst, md, &i)) goto digerr;
 116         if (!(ASN1_OCTET_STRING_set(cid->issuerNameHash, md, i))) goto err;
 117
 118         /* Calculate the issuerKey hash, excluding tag and length */
 119         EVP_DigestInit(&ctx,dgst);
 120         EVP_DigestUpdate(&ctx,issuerKey->data, issuerKey->length);
 121         EVP_DigestFinal(&ctx,md,&i);
 122
 123         if (!(ASN1_OCTET_STRING_set(cid->issuerKeyHash, md, i))) goto err;
 124
 125         if (cid->serialNumber != NULL) ASN1_INTEGER_free(cid->serialNumber);
 126         if (!(cid->serialNumber = ASN1_INTEGER_dup(serialNumber))) goto err;
 127         return cid;
 128 digerr:
 129         OCSPerr(OCSP_F_CERT_ID_NEW,OCSP_R_DIGEST_ERR);
 130 err:
 131         if (cid) OCSP_CERTID_free(cid);
 132         return NULL;
 133         }
 134
 135 OCSP_CERTSTATUS *OCSP_cert_status_new(int status, int reason, char *tim)
 136         {
 137         OCSP_REVOKEDINFO *ri;
 138         OCSP_CERTSTATUS *cs = NULL;
 139
 140         if (!(cs = OCSP_CERTSTATUS_new())) goto err;
 141         if ((cs->type = status) == V_OCSP_CERTSTATUS_REVOKED)
 142                 {
 143                 if (!time)
 144                         {
 145                         OCSPerr(OCSP_F_CERT_STATUS_NEW,OCSP_R_REVOKED_NO_TIME);
 146                         goto err;
 147                         }
 148                 if (!(cs->value.revoked = ri = OCSP_REVOKEDINFO_new())) goto err;
 149                 if (!ASN1_GENERALIZEDTIME_set_string(ri->revocationTime,tim))
 150                         goto err;
 151                 if (reason != OCSP_REVOKED_STATUS_NOSTATUS)
 152                         {
 153                         if (!(ri->revocationReason = ASN1_ENUMERATED_new()))
 154                                 goto err;
 155                         if (!(ASN1_ENUMERATED_set(ri->revocationReason,
 156                                                   reason)))
 157                                 goto err;
 158                         }
 159                 }
 160         return cs;
 161 err:
 162         if (cs) OCSP_CERTSTATUS_free(cs);
 163         return NULL;
 164         }
 165
 166 int OCSP_id_cmp(OCSP_CERTID *a, OCSP_CERTID *b)
 167         {
 168         int ret;
 169         ret = OBJ_cmp(a->hashAlgorithm->algorithm, b->hashAlgorithm->algorithm);
 170         if (ret) return ret;
 171         ret = ASN1_OCTET_STRING_cmp(a->issuerNameHash, b->issuerNameHash);
 172         if (ret) return ret;
 173         ret = ASN1_OCTET_STRING_cmp(a->issuerKeyHash, b->issuerKeyHash);
 174         if (ret) return ret;
 175         return ASN1_INTEGER_cmp(a->serialNumber, b->serialNumber);
 176         }
 177
 178 OCSP_BASICRESP *OCSP_basic_response_new(int type, X509* cert)
 179         {
 180         time_t t;
 181         OCSP_RESPID *rid;
 182         ASN1_BIT_STRING *bs;
 183         OCSP_BASICRESP *rsp = NULL;
 184         unsigned char md[SHA_DIGEST_LENGTH];
 185
 186         if (!(rsp = OCSP_BASICRESP_new())) goto err;
 187         rid = rsp->tbsResponseData->responderId;
 188         switch (rid->type = type)
 189                 {
 190                 case V_OCSP_RESPID_NAME:
 191                         /* cert is user cert */
 192                         if (!(rid->value.byName =
 193                                   X509_NAME_dup(X509_get_subject_name(cert))))
 194                                 goto err;
 195                         break;
 196                 case V_OCSP_RESPID_KEY:
 197                         /* cert is issuer cert */
 198                         /* SHA-1 hash of responder's public key
 199                          * (excluding the tag and length fields)
 200                          */
 201                         bs = cert->cert_info->key->public_key;
 202                         SHA1(ASN1_STRING_data((ASN1_STRING*)bs),
 203                              ASN1_STRING_length((ASN1_STRING*)bs), md);
 204                         if (!(rid->value.byKey = ASN1_OCTET_STRING_new()))
 205                                 goto err;
 206                         if (!(ASN1_OCTET_STRING_set(rid->value.byKey,
 207                                                     md, sizeof md)))
 208                                 goto err;
 209                         break;
 210                 default:
 211                         OCSPerr(OCSP_F_BASIC_RESPONSE_NEW,OCSP_R_BAD_TAG);
 212                         goto err;
 213                         break;
 214                 }
 215         time(&t);
 216         if (!(ASN1_GENERALIZEDTIME_set(rsp->tbsResponseData->producedAt, t)))
 217                 goto err;
 218         if (!(rsp->tbsResponseData->responses = sk_OCSP_SINGLERESP_new(NULL))) goto err;
 219         return rsp;
 220 err:
 221         if (rsp) OCSP_BASICRESP_free(rsp);
 222         return NULL;
 223         }
 224
 225 int OCSP_basic_response_add(OCSP_BASICRESP           *rsp,
 226                             OCSP_CERTID              *cid,
 227                             OCSP_CERTSTATUS          *cst,
 228                             char                     *this,
 229                             char                     *next)
 230         {
 231         OCSP_SINGLERESP *single = NULL;
 232
 233         if (!(single = OCSP_SINGLERESP_new())) goto err;
 234         if (single->certId) OCSP_CERTID_free(single->certId);
 235         if (!(single->certId = OCSP_CERTID_dup(cid))) goto err;
 236         if (single->certStatus) OCSP_CERTSTATUS_free(single->certStatus);
 237         if (!(single->certStatus = OCSP_CERTSTATUS_dup(cst))) goto err;
 238         if (!ASN1_GENERALIZEDTIME_set_string(single->thisUpdate,this))goto err;
 239         if (next)
 240                 {
 241                 if (!(single->nextUpdate = ASN1_GENERALIZEDTIME_new()))
 242                         goto err;
 243                 if (!ASN1_GENERALIZEDTIME_set_string(single->nextUpdate,next))
 244                         goto err;
 245                 }
 246         if (!sk_OCSP_SINGLERESP_push(rsp->tbsResponseData->responses,single)) goto err;
 247         return 1;
 248 err:
 249         if (single) OCSP_SINGLERESP_free(single);
 250         return 0;
 251         }
 252
 253 int OCSP_basic_response_sign(OCSP_BASICRESP *brsp,
 254                              EVP_PKEY       *key,
 255                              const EVP_MD   *dgst,
 256                              STACK_OF(X509) *certs)
 257         {
 258         int i;
 259
 260         /* Right now, I think that not doing double hashing is the right
 261            thing.       -- Richard Levitte */
 262         if (!OCSP_BASICRESP_sign(brsp, key, dgst, 0)) goto err;
 263         if (certs)
 264                 {
 265                 if (!(brsp->certs = sk_X509_dup(certs))) goto err;
 266                 for (i = 0; i < sk_X509_num(brsp->certs); i++)
 267                         {
 268                         sk_X509_set(brsp->certs, i,
 269                                X509_dup(sk_X509_value(certs, i)));
 270                         if (! sk_X509_value(brsp->certs, i))
 271                                 goto err;
 272                         }
 273                 }
 274         return 1;
 275 err:
 276         return 0;
 277         }
 278
 279 OCSP_RESPONSE *OCSP_response_new(int status,
 280                                  int nid,
 281                                  int (*i2d)(),
 282                                  char *data)
 283         {
 284         OCSP_RESPONSE *rsp = NULL;
 285
 286         if (!(rsp = OCSP_RESPONSE_new())) goto err;
 287         if (!(ASN1_ENUMERATED_set(rsp->responseStatus, status))) goto err;
 288         if (!(rsp->responseBytes = OCSP_RESPBYTES_new())) goto err;
 289         if (rsp->responseBytes->responseType) ASN1_OBJECT_free(rsp->responseBytes->responseType);
 290         if (!(rsp->responseBytes->responseType = OBJ_nid2obj(nid))) goto err;
 291         if (!ASN1_STRING_encode((ASN1_STRING*)rsp->responseBytes->response,
 292                                 i2d, data, NULL)) goto err;
 293         return rsp;
 294 err:
 295         if (rsp) OCSP_RESPONSE_free(rsp);
 296         return NULL;
 297         }
 298
 299 /* XXX assumes certs in signature are sorted root to leaf XXX */
 300 int OCSP_request_verify(OCSP_REQUEST *req, EVP_PKEY *pkey)
 301         {
 302         STACK_OF(X509) *sk;
 303
 304         if (!req->optionalSignature) return 0;
 305         if (pkey == NULL)
 306                 {
 307                 if (!(sk = req->optionalSignature->certs)) return 0;
 308                 if (!(pkey=X509_get_pubkey(sk_X509_value(sk, sk_X509_num(sk)-1))))
 309                         {
 310                         OCSPerr(OCSP_F_REQUEST_VERIFY,OCSP_R_NO_PUBLIC_KEY);
 311                         return 0;
 312                         }
 313                 }
 314         return OCSP_REQUEST_verify(req, pkey);
 315         }
 316
 317 int OCSP_response_verify(OCSP_RESPONSE *rsp, EVP_PKEY *pkey)
 318         {
 319         int i, r;
 320         unsigned char *p;
 321         OCSP_RESPBYTES *rb;
 322         OCSP_BASICRESP *br = NULL;
 323
 324         if ((rb = rsp->responseBytes) == NULL)
 325                 {
 326                 OCSPerr(OCSP_F_RESPONSE_VERIFY,OCSP_R_NO_RESPONSE_DATA);
 327                 return 0;
 328                 }
 329         if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic)
 330                 {
 331                 OCSPerr(OCSP_F_RESPONSE_VERIFY,OCSP_R_BAD_TAG);
 332                 return 0;
 333                 }
 334         p = ASN1_STRING_data(rb->response);
 335         i = ASN1_STRING_length(rb->response);
 336         if (!(d2i_OCSP_BASICRESP(&br, &p, i))) return 0;
 337         r = OCSP_basic_response_verify(br, pkey);
 338         OCSP_BASICRESP_free(br);
 339         return r;
 340         }
 341
 342 int OCSP_basic_response_verify(OCSP_BASICRESP *rsp, EVP_PKEY *pkey)
 343         {
 344         STACK_OF(X509) *sk;
 345         int ret;
 346
 347         if (!rsp->signature)
 348                 {
 349                 OCSPerr(OCSP_F_BASIC_RESPONSE_VERIFY,OCSP_R_NO_SIGNATURE);
 350                 return 0;
 351                 }
 352         if (pkey == NULL)
 353                 {
 354                 if (!(sk = rsp->certs))
 355                         {
 356                         OCSPerr(OCSP_F_BASIC_RESPONSE_VERIFY,OCSP_R_NO_CERTIFICATE);
 357                         return 0;
 358                         }
 359                 if (!(pkey=X509_get_pubkey(sk_X509_value(sk, sk_X509_num(sk)-1))))
 360                         {
 361                         OCSPerr(OCSP_F_BASIC_RESPONSE_VERIFY,OCSP_R_NO_PUBLIC_KEY);
 362                         return 0;
 363                         }
 364                 }
 365         ret = OCSP_BASICRESP_verify(rsp, pkey, 0);
 366         return ret;
 367         }