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371 lines
10 KiB
371 lines
10 KiB
/* ocsp_cl.c */
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/* Written by Tom Titchener <Tom_Titchener@groove.net> for the OpenSSL
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* project. */
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/* History:
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This file was transfered to Richard Levitte from CertCo by Kathy
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Weinhold in mid-spring 2000 to be included in OpenSSL or released
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as a patch kit. */
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/* ====================================================================
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* Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include <time.h>
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#include <cryptlib.h>
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#include <openssl/objects.h>
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#include <openssl/rand.h>
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#include <openssl/x509.h>
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#include <openssl/pem.h>
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#include <openssl/x509v3.h>
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#include <openssl/ocsp.h>
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/* Utility functions related to sending OCSP requests and extracting
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* relevant information from the response.
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*/
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/* Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ
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* pointer: useful if we want to add extensions.
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*/
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OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)
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{
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OCSP_ONEREQ *one = NULL;
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if (!(one = OCSP_ONEREQ_new())) goto err;
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if (one->reqCert) OCSP_CERTID_free(one->reqCert);
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one->reqCert = cid;
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if (req &&
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!sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one))
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goto err;
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return one;
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err:
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OCSP_ONEREQ_free(one);
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return NULL;
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}
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/* Set requestorName from an X509_NAME structure */
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int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm)
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{
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GENERAL_NAME *gen;
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gen = GENERAL_NAME_new();
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if (gen == NULL)
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return 0;
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if (!X509_NAME_set(&gen->d.directoryName, nm))
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{
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GENERAL_NAME_free(gen);
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return 0;
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}
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gen->type = GEN_DIRNAME;
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if (req->tbsRequest->requestorName)
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GENERAL_NAME_free(req->tbsRequest->requestorName);
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req->tbsRequest->requestorName = gen;
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return 1;
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}
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/* Add a certificate to an OCSP request */
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int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)
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{
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OCSP_SIGNATURE *sig;
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if (!req->optionalSignature)
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req->optionalSignature = OCSP_SIGNATURE_new();
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sig = req->optionalSignature;
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if (!sig) return 0;
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if (!cert) return 1;
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if (!sig->certs && !(sig->certs = sk_X509_new_null()))
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return 0;
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if(!sk_X509_push(sig->certs, cert)) return 0;
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CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
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return 1;
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}
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/* Sign an OCSP request set the requestorName to the subjec
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* name of an optional signers certificate and include one
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* or more optional certificates in the request. Behaves
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* like PKCS7_sign().
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*/
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int OCSP_request_sign(OCSP_REQUEST *req,
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X509 *signer,
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EVP_PKEY *key,
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const EVP_MD *dgst,
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STACK_OF(X509) *certs,
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unsigned long flags)
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{
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int i;
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OCSP_SIGNATURE *sig;
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X509 *x;
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if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))
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goto err;
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if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) goto err;
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if (key)
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{
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if (!X509_check_private_key(signer, key))
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{
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OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
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goto err;
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}
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if (!OCSP_REQUEST_sign(req, key, dgst)) goto err;
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}
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if (!(flags & OCSP_NOCERTS))
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{
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if(!OCSP_request_add1_cert(req, signer)) goto err;
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for (i = 0; i < sk_X509_num(certs); i++)
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{
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x = sk_X509_value(certs, i);
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if (!OCSP_request_add1_cert(req, x)) goto err;
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}
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}
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return 1;
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err:
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OCSP_SIGNATURE_free(req->optionalSignature);
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req->optionalSignature = NULL;
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return 0;
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}
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/* Get response status */
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int OCSP_response_status(OCSP_RESPONSE *resp)
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{
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return ASN1_ENUMERATED_get(resp->responseStatus);
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}
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/* Extract basic response from OCSP_RESPONSE or NULL if
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* no basic response present.
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*/
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OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)
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{
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OCSP_RESPBYTES *rb;
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rb = resp->responseBytes;
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if (!rb)
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{
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OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);
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return NULL;
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}
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if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic)
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{
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OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);
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return NULL;
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}
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return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));
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}
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/* Return number of OCSP_SINGLERESP reponses present in
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* a basic response.
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*/
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int OCSP_resp_count(OCSP_BASICRESP *bs)
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{
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if (!bs) return -1;
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return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses);
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}
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/* Extract an OCSP_SINGLERESP response with a given index */
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OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)
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{
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if (!bs) return NULL;
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return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx);
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}
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/* Look single response matching a given certificate ID */
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int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)
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{
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int i;
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STACK_OF(OCSP_SINGLERESP) *sresp;
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OCSP_SINGLERESP *single;
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if (!bs) return -1;
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if (last < 0) last = 0;
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else last++;
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sresp = bs->tbsResponseData->responses;
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for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++)
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{
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single = sk_OCSP_SINGLERESP_value(sresp, i);
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if (!OCSP_id_cmp(id, single->certId)) return i;
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}
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return -1;
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}
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/* Extract status information from an OCSP_SINGLERESP structure.
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* Note: the revtime and reason values are only set if the
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* certificate status is revoked. Returns numerical value of
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* status.
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*/
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int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
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ASN1_GENERALIZEDTIME **revtime,
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ASN1_GENERALIZEDTIME **thisupd,
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ASN1_GENERALIZEDTIME **nextupd)
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{
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int ret;
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OCSP_CERTSTATUS *cst;
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if(!single) return -1;
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cst = single->certStatus;
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ret = cst->type;
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if (ret == V_OCSP_CERTSTATUS_REVOKED)
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{
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OCSP_REVOKEDINFO *rev = cst->value.revoked;
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if (revtime) *revtime = rev->revocationTime;
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if (reason)
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{
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if(rev->revocationReason)
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*reason = ASN1_ENUMERATED_get(rev->revocationReason);
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else *reason = -1;
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}
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}
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if(thisupd) *thisupd = single->thisUpdate;
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if(nextupd) *nextupd = single->nextUpdate;
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return ret;
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}
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/* This function combines the previous ones: look up a certificate ID and
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* if found extract status information. Return 0 is successful.
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*/
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int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
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int *reason,
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ASN1_GENERALIZEDTIME **revtime,
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ASN1_GENERALIZEDTIME **thisupd,
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ASN1_GENERALIZEDTIME **nextupd)
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{
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int i;
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OCSP_SINGLERESP *single;
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i = OCSP_resp_find(bs, id, -1);
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/* Maybe check for multiple responses and give an error? */
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if(i < 0) return 0;
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single = OCSP_resp_get0(bs, i);
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i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);
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if(status) *status = i;
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return 1;
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}
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/* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will
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* take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid
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* rejecting otherwise valid time we allow the times to be within 'nsec' of the current time.
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* Also to avoid accepting very old responses without a nextUpdate field an optional maxage
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* parameter specifies the maximum age the thisUpdate field can be.
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*/
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int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)
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{
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int ret = 1;
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time_t t_now, t_tmp;
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time(&t_now);
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/* Check thisUpdate is valid and not more than nsec in the future */
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if (!ASN1_GENERALIZEDTIME_check(thisupd))
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{
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);
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ret = 0;
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}
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else
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{
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t_tmp = t_now + nsec;
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if (X509_cmp_time(thisupd, &t_tmp) > 0)
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{
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);
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ret = 0;
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}
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/* If maxsec specified check thisUpdate is not more than maxsec in the past */
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if (maxsec >= 0)
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{
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t_tmp = t_now - maxsec;
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if (X509_cmp_time(thisupd, &t_tmp) < 0)
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{
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);
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ret = 0;
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}
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}
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}
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if (!nextupd) return ret;
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/* Check nextUpdate is valid and not more than nsec in the past */
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if (!ASN1_GENERALIZEDTIME_check(nextupd))
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{
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);
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ret = 0;
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}
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else
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{
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t_tmp = t_now - nsec;
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if (X509_cmp_time(nextupd, &t_tmp) < 0)
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{
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);
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ret = 0;
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}
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}
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/* Also don't allow nextUpdate to precede thisUpdate */
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if (ASN1_STRING_cmp(nextupd, thisupd) < 0)
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{
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);
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ret = 0;
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}
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return ret;
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}
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