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
 167 int OCSP_id_issuer_cmp(OCSP_CERTID *a, OCSP_CERTID *b)
 168         {
 169         int ret;
 170         ret = OBJ_cmp(a->hashAlgorithm->algorithm, b->hashAlgorithm->algorithm);
 171         if (ret) return ret;
 172         ret = ASN1_OCTET_STRING_cmp(a->issuerNameHash, b->issuerNameHash);
 173         if (ret) return ret;
 174         return ASN1_OCTET_STRING_cmp(a->issuerKeyHash, b->issuerKeyHash);
 175         }
 176
 177 int OCSP_id_cmp(OCSP_CERTID *a, OCSP_CERTID *b)
 178         {
 179         int ret;
 180         ret = OCSP_id_issuer_cmp(a, b);
 181         if (ret) return ret;
 182         return ASN1_INTEGER_cmp(a->serialNumber, b->serialNumber);
 183         }
 184
 185 OCSP_BASICRESP *OCSP_basic_response_new(int type, X509* cert)
 186         {
 187         time_t t;
 188         OCSP_RESPID *rid;
 189         ASN1_BIT_STRING *bs;
 190         OCSP_BASICRESP *rsp = NULL;
 191         unsigned char md[SHA_DIGEST_LENGTH];
 192
 193         if (!(rsp = OCSP_BASICRESP_new())) goto err;
 194         rid = rsp->tbsResponseData->responderId;
 195         switch (rid->type = type)
 196                 {
 197                 case V_OCSP_RESPID_NAME:
 198                         /* cert is user cert */
 199                         if (!(rid->value.byName =
 200                                   X509_NAME_dup(X509_get_subject_name(cert))))
 201                                 goto err;
 202                         break;
 203                 case V_OCSP_RESPID_KEY:
 204                         /* cert is issuer cert */
 205                         /* SHA-1 hash of responder's public key
 206                          * (excluding the tag and length fields)
 207                          */
 208                         bs = cert->cert_info->key->public_key;
 209                         SHA1(ASN1_STRING_data((ASN1_STRING*)bs),
 210                              ASN1_STRING_length((ASN1_STRING*)bs), md);
 211                         if (!(rid->value.byKey = ASN1_OCTET_STRING_new()))
 212                                 goto err;
 213                         if (!(ASN1_OCTET_STRING_set(rid->value.byKey,
 214                                                     md, sizeof md)))
 215                                 goto err;
 216                         break;
 217                 default:
 218                         OCSPerr(OCSP_F_BASIC_RESPONSE_NEW,OCSP_R_BAD_TAG);
 219                         goto err;
 220                         break;
 221                 }
 222         time(&t);
 223         if (!(ASN1_GENERALIZEDTIME_set(rsp->tbsResponseData->producedAt, t)))
 224                 goto err;
 225         if (!(rsp->tbsResponseData->responses = sk_OCSP_SINGLERESP_new(NULL))) goto err;
 226         return rsp;
 227 err:
 228         if (rsp) OCSP_BASICRESP_free(rsp);
 229         return NULL;
 230         }
 231
 232 int OCSP_basic_response_add(OCSP_BASICRESP           *rsp,
 233                             OCSP_CERTID              *cid,
 234                             OCSP_CERTSTATUS          *cst,
 235                             char                     *this,
 236                             char                     *next)
 237         {
 238         OCSP_SINGLERESP *single = NULL;
 239
 240         if (!(single = OCSP_SINGLERESP_new())) goto err;
 241         if (single->certId) OCSP_CERTID_free(single->certId);
 242         if (!(single->certId = OCSP_CERTID_dup(cid))) goto err;
 243         if (single->certStatus) OCSP_CERTSTATUS_free(single->certStatus);
 244         if (!(single->certStatus = OCSP_CERTSTATUS_dup(cst))) goto err;
 245         if (!ASN1_GENERALIZEDTIME_set_string(single->thisUpdate,this))goto err;
 246         if (next)
 247                 {
 248                 if (!(single->nextUpdate = ASN1_GENERALIZEDTIME_new()))
 249                         goto err;
 250                 if (!ASN1_GENERALIZEDTIME_set_string(single->nextUpdate,next))
 251                         goto err;
 252                 }
 253         if (!sk_OCSP_SINGLERESP_push(rsp->tbsResponseData->responses,single)) goto err;
 254         return 1;
 255 err:
 256         if (single) OCSP_SINGLERESP_free(single);
 257         return 0;
 258         }
 259
 260 int OCSP_basic_response_sign(OCSP_BASICRESP *brsp,
 261                              EVP_PKEY       *key,
 262                              const EVP_MD   *dgst,
 263                              STACK_OF(X509) *certs)
 264         {
 265         int i;
 266
 267         /* Right now, I think that not doing double hashing is the right
 268            thing.       -- Richard Levitte */
 269         if (!OCSP_BASICRESP_sign(brsp, key, dgst, 0)) goto err;
 270         if (certs)
 271                 {
 272                 if (!(brsp->certs = sk_X509_dup(certs))) goto err;
 273                 for (i = 0; i < sk_X509_num(brsp->certs); i++)
 274                         {
 275                         sk_X509_set(brsp->certs, i,
 276                                X509_dup(sk_X509_value(certs, i)));
 277                         if (! sk_X509_value(brsp->certs, i))
 278                                 goto err;
 279                         }
 280                 }
 281         return 1;
 282 err:
 283         return 0;
 284         }
 285
 286 OCSP_RESPONSE *OCSP_response_new(int status,
 287                                  int nid,
 288                                  int (*i2d)(),
 289                                  char *data)
 290         {
 291         OCSP_RESPONSE *rsp = NULL;
 292
 293         if (!(rsp = OCSP_RESPONSE_new())) goto err;
 294         if (!(ASN1_ENUMERATED_set(rsp->responseStatus, status))) goto err;
 295         if (!(rsp->responseBytes = OCSP_RESPBYTES_new())) goto err;
 296         if (rsp->responseBytes->responseType) ASN1_OBJECT_free(rsp->responseBytes->responseType);
 297         if (!(rsp->responseBytes->responseType = OBJ_nid2obj(nid))) goto err;
 298         if (!ASN1_STRING_encode((ASN1_STRING*)rsp->responseBytes->response,
 299                                 i2d, data, NULL)) goto err;
 300         return rsp;
 301 err:
 302         if (rsp) OCSP_RESPONSE_free(rsp);
 303         return NULL;
 304         }
 305
 306 /* XXX assumes certs in signature are sorted root to leaf XXX */
 307 int OCSP_request_verify(OCSP_REQUEST *req, EVP_PKEY *pkey)
 308         {
 309         STACK_OF(X509) *sk;
 310
 311         if (!req->optionalSignature) return 0;
 312         if (pkey == NULL)
 313                 {
 314                 if (!(sk = req->optionalSignature->certs)) return 0;
 315                 if (!(pkey=X509_get_pubkey(sk_X509_value(sk, sk_X509_num(sk)-1))))
 316                         {
 317                         OCSPerr(OCSP_F_REQUEST_VERIFY,OCSP_R_NO_PUBLIC_KEY);
 318                         return 0;
 319                         }
 320                 }
 321         return OCSP_REQUEST_verify(req, pkey);
 322         }
 323
 324 int OCSP_response_verify(OCSP_RESPONSE *rsp, EVP_PKEY *pkey)
 325         {
 326         int i, r;
 327         unsigned char *p;
 328         OCSP_RESPBYTES *rb;
 329         OCSP_BASICRESP *br = NULL;
 330
 331         if ((rb = rsp->responseBytes) == NULL)
 332                 {
 333                 OCSPerr(OCSP_F_RESPONSE_VERIFY,OCSP_R_NO_RESPONSE_DATA);
 334                 return 0;
 335                 }
 336         if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic)
 337                 {
 338                 OCSPerr(OCSP_F_RESPONSE_VERIFY,OCSP_R_BAD_TAG);
 339                 return 0;
 340                 }
 341         p = ASN1_STRING_data(rb->response);
 342         i = ASN1_STRING_length(rb->response);
 343         if (!(d2i_OCSP_BASICRESP(&br, &p, i))) return 0;
 344         r = OCSP_basic_response_verify(br, pkey);
 345         OCSP_BASICRESP_free(br);
 346         return r;
 347         }
 348
 349 int OCSP_basic_response_verify(OCSP_BASICRESP *rsp, EVP_PKEY *pkey)
 350         {
 351         STACK_OF(X509) *sk;
 352         int ret;
 353
 354         if (!rsp->signature)
 355                 {
 356                 OCSPerr(OCSP_F_BASIC_RESPONSE_VERIFY,OCSP_R_NO_SIGNATURE);
 357                 return 0;
 358                 }
 359         if (pkey == NULL)
 360                 {
 361                 if (!(sk = rsp->certs))
 362                         {
 363                         OCSPerr(OCSP_F_BASIC_RESPONSE_VERIFY,OCSP_R_NO_CERTIFICATE);
 364                         return 0;
 365                         }
 366                 if (!(pkey=X509_get_pubkey(sk_X509_value(sk, sk_X509_num(sk)-1))))
 367                         {
 368                         OCSPerr(OCSP_F_BASIC_RESPONSE_VERIFY,OCSP_R_NO_PUBLIC_KEY);
 369                         return 0;
 370                         }
 371                 }
 372         ret = OCSP_BASICRESP_verify(rsp, pkey, 0);
 373         return ret;
 374         }