sl@0: /* ocsp_cl.c */
sl@0: /* Written by Tom Titchener <Tom_Titchener@groove.net> for the OpenSSL
sl@0:  * project. */
sl@0: 
sl@0: /* History:
sl@0:    This file was transfered to Richard Levitte from CertCo by Kathy
sl@0:    Weinhold in mid-spring 2000 to be included in OpenSSL or released
sl@0:    as a patch kit. */
sl@0: 
sl@0: /* ====================================================================
sl@0:  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  *
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer. 
sl@0:  *
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in
sl@0:  *    the documentation and/or other materials provided with the
sl@0:  *    distribution.
sl@0:  *
sl@0:  * 3. All advertising materials mentioning features or use of this
sl@0:  *    software must display the following acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
sl@0:  *
sl@0:  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
sl@0:  *    endorse or promote products derived from this software without
sl@0:  *    prior written permission. For written permission, please contact
sl@0:  *    openssl-core@openssl.org.
sl@0:  *
sl@0:  * 5. Products derived from this software may not be called "OpenSSL"
sl@0:  *    nor may "OpenSSL" appear in their names without prior written
sl@0:  *    permission of the OpenSSL Project.
sl@0:  *
sl@0:  * 6. Redistributions of any form whatsoever must retain the following
sl@0:  *    acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
sl@0:  *
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
sl@0:  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
sl@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
sl@0:  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
sl@0:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
sl@0:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
sl@0:  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
sl@0:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
sl@0:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
sl@0:  * OF THE POSSIBILITY OF SUCH DAMAGE.
sl@0:  * ====================================================================
sl@0:  *
sl@0:  * This product includes cryptographic software written by Eric Young
sl@0:  * (eay@cryptsoft.com).  This product includes software written by Tim
sl@0:  * Hudson (tjh@cryptsoft.com).
sl@0:  *
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include <time.h>
sl@0: #include <cryptlib.h>
sl@0: #include <openssl/objects.h>
sl@0: #include <openssl/rand.h>
sl@0: #include <openssl/x509.h>
sl@0: #include <openssl/pem.h>
sl@0: #include <openssl/x509v3.h>
sl@0: #include <openssl/ocsp.h>
sl@0: 
sl@0: /* Utility functions related to sending OCSP requests and extracting
sl@0:  * relevant information from the response.
sl@0:  */
sl@0: 
sl@0: /* Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ 
sl@0:  * pointer: useful if we want to add extensions.
sl@0:  */
sl@0: 
sl@0: EXPORT_C OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)
sl@0:         {
sl@0: 	OCSP_ONEREQ *one = NULL;
sl@0: 
sl@0: 	if (!(one = OCSP_ONEREQ_new())) goto err;
sl@0: 	if (one->reqCert) OCSP_CERTID_free(one->reqCert);
sl@0: 	one->reqCert = cid;
sl@0: 	if (req &&
sl@0: 		!sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one))
sl@0: 				goto err;
sl@0: 	return one;
sl@0: err:
sl@0: 	OCSP_ONEREQ_free(one);
sl@0: 	return NULL;
sl@0:         }
sl@0: 
sl@0: /* Set requestorName from an X509_NAME structure */
sl@0: 
sl@0: EXPORT_C int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm)
sl@0: 	{
sl@0: 	GENERAL_NAME *gen;
sl@0: 	gen = GENERAL_NAME_new();
sl@0: 	if (gen == NULL)
sl@0: 		return 0;
sl@0: 	if (!X509_NAME_set(&gen->d.directoryName, nm))
sl@0: 		{
sl@0: 		GENERAL_NAME_free(gen);
sl@0: 		return 0;
sl@0: 		}
sl@0: 	gen->type = GEN_DIRNAME;
sl@0: 	if (req->tbsRequest->requestorName)
sl@0: 		GENERAL_NAME_free(req->tbsRequest->requestorName);
sl@0: 	req->tbsRequest->requestorName = gen;
sl@0: 	return 1;
sl@0: 	}
sl@0: 	
sl@0: 
sl@0: /* Add a certificate to an OCSP request */
sl@0: 
sl@0: EXPORT_C int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)
sl@0: 	{
sl@0: 	OCSP_SIGNATURE *sig;
sl@0: 	if (!req->optionalSignature)
sl@0: 		req->optionalSignature = OCSP_SIGNATURE_new();
sl@0: 	sig = req->optionalSignature;
sl@0: 	if (!sig) return 0;
sl@0: 	if (!cert) return 1;
sl@0: 	if (!sig->certs && !(sig->certs = sk_X509_new_null()))
sl@0: 		return 0;
sl@0: 
sl@0: 	if(!sk_X509_push(sig->certs, cert)) return 0;
sl@0: 	CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: /* Sign an OCSP request set the requestorName to the subjec
sl@0:  * name of an optional signers certificate and include one
sl@0:  * or more optional certificates in the request. Behaves
sl@0:  * like PKCS7_sign().
sl@0:  */
sl@0: 
sl@0: EXPORT_C int OCSP_request_sign(OCSP_REQUEST   *req,
sl@0: 		      X509           *signer,
sl@0: 		      EVP_PKEY       *key,
sl@0: 		      const EVP_MD   *dgst,
sl@0: 		      STACK_OF(X509) *certs,
sl@0: 		      unsigned long flags)
sl@0:         {
sl@0: 	int i;
sl@0: 	OCSP_SIGNATURE *sig;
sl@0: 	X509 *x;
sl@0: 
sl@0: 	if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))
sl@0: 			goto err;
sl@0: 
sl@0: 	if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) goto err;
sl@0: 	if (!dgst) dgst = EVP_sha1();
sl@0: 	if (key)
sl@0: 		{
sl@0: 		if (!X509_check_private_key(signer, key))
sl@0: 			{
sl@0: 			OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
sl@0: 			goto err;
sl@0: 			}
sl@0: 		if (!OCSP_REQUEST_sign(req, key, dgst)) goto err;
sl@0: 		}
sl@0: 
sl@0: 	if (!(flags & OCSP_NOCERTS))
sl@0: 		{
sl@0: 		if(!OCSP_request_add1_cert(req, signer)) goto err;
sl@0: 		for (i = 0; i < sk_X509_num(certs); i++)
sl@0: 			{
sl@0: 			x = sk_X509_value(certs, i);
sl@0: 			if (!OCSP_request_add1_cert(req, x)) goto err;
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	return 1;
sl@0: err:
sl@0: 	OCSP_SIGNATURE_free(req->optionalSignature);
sl@0: 	req->optionalSignature = NULL;
sl@0: 	return 0;
sl@0: 	}
sl@0: 
sl@0: /* Get response status */
sl@0: 
sl@0: EXPORT_C int OCSP_response_status(OCSP_RESPONSE *resp)
sl@0: 	{
sl@0: 	return ASN1_ENUMERATED_get(resp->responseStatus);
sl@0: 	}
sl@0: 
sl@0: /* Extract basic response from OCSP_RESPONSE or NULL if
sl@0:  * no basic response present.
sl@0:  */
sl@0:  
sl@0: 
sl@0: EXPORT_C OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)
sl@0: 	{
sl@0: 	OCSP_RESPBYTES *rb;
sl@0: 	rb = resp->responseBytes;
sl@0: 	if (!rb)
sl@0: 		{
sl@0: 		OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);
sl@0: 		return NULL;
sl@0: 		}
sl@0: 	if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic)
sl@0: 		{
sl@0: 		OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);
sl@0: 		return NULL;
sl@0: 		}
sl@0: 
sl@0: 	return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));
sl@0: 	}
sl@0: 
sl@0: /* Return number of OCSP_SINGLERESP reponses present in
sl@0:  * a basic response.
sl@0:  */
sl@0: 
sl@0: EXPORT_C int OCSP_resp_count(OCSP_BASICRESP *bs)
sl@0: 	{
sl@0: 	if (!bs) return -1;
sl@0: 	return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses);
sl@0: 	}
sl@0: 
sl@0: /* Extract an OCSP_SINGLERESP response with a given index */
sl@0: 
sl@0: EXPORT_C OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)
sl@0: 	{
sl@0: 	if (!bs) return NULL;
sl@0: 	return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx);
sl@0: 	}
sl@0: 
sl@0: /* Look single response matching a given certificate ID */
sl@0: 
sl@0: EXPORT_C int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)
sl@0: 	{
sl@0: 	int i;
sl@0: 	STACK_OF(OCSP_SINGLERESP) *sresp;
sl@0: 	OCSP_SINGLERESP *single;
sl@0: 	if (!bs) return -1;
sl@0: 	if (last < 0) last = 0;
sl@0: 	else last++;
sl@0: 	sresp = bs->tbsResponseData->responses;
sl@0: 	for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++)
sl@0: 		{
sl@0: 		single = sk_OCSP_SINGLERESP_value(sresp, i);
sl@0: 		if (!OCSP_id_cmp(id, single->certId)) return i;
sl@0: 		}
sl@0: 	return -1;
sl@0: 	}
sl@0: 
sl@0: /* Extract status information from an OCSP_SINGLERESP structure.
sl@0:  * Note: the revtime and reason values are only set if the 
sl@0:  * certificate status is revoked. Returns numerical value of
sl@0:  * status.
sl@0:  */
sl@0: 
sl@0: EXPORT_C int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
sl@0: 				ASN1_GENERALIZEDTIME **revtime,
sl@0: 				ASN1_GENERALIZEDTIME **thisupd,
sl@0: 				ASN1_GENERALIZEDTIME **nextupd)
sl@0: 	{
sl@0: 	int ret;
sl@0: 	OCSP_CERTSTATUS *cst;
sl@0: 	if(!single) return -1;
sl@0: 	cst = single->certStatus;
sl@0: 	ret = cst->type;
sl@0: 	if (ret == V_OCSP_CERTSTATUS_REVOKED)
sl@0: 		{
sl@0: 		OCSP_REVOKEDINFO *rev = cst->value.revoked;
sl@0: 		if (revtime) *revtime = rev->revocationTime;
sl@0: 		if (reason) 
sl@0: 			{
sl@0: 			if(rev->revocationReason)
sl@0: 				*reason = ASN1_ENUMERATED_get(rev->revocationReason);
sl@0: 			else *reason = -1;
sl@0: 			}
sl@0: 		}
sl@0: 	if(thisupd) *thisupd = single->thisUpdate;
sl@0: 	if(nextupd) *nextupd = single->nextUpdate;
sl@0: 	return ret;
sl@0: 	}
sl@0: 
sl@0: /* This function combines the previous ones: look up a certificate ID and
sl@0:  * if found extract status information. Return 0 is successful.
sl@0:  */
sl@0: 
sl@0: EXPORT_C int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
sl@0: 				int *reason,
sl@0: 				ASN1_GENERALIZEDTIME **revtime,
sl@0: 				ASN1_GENERALIZEDTIME **thisupd,
sl@0: 				ASN1_GENERALIZEDTIME **nextupd)
sl@0: 	{
sl@0: 	int i;
sl@0: 	OCSP_SINGLERESP *single;
sl@0: 	i = OCSP_resp_find(bs, id, -1);
sl@0: 	/* Maybe check for multiple responses and give an error? */
sl@0: 	if(i < 0) return 0;
sl@0: 	single = OCSP_resp_get0(bs, i);
sl@0: 	i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);
sl@0: 	if(status) *status = i;
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: /* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will
sl@0:  * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid
sl@0:  * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time.
sl@0:  * Also to avoid accepting very old responses without a nextUpdate field an optional maxage
sl@0:  * parameter specifies the maximum age the thisUpdate field can be.
sl@0:  */
sl@0: 
sl@0: EXPORT_C int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)
sl@0: 	{
sl@0: 	int ret = 1;
sl@0: 	time_t t_now, t_tmp;
sl@0: 	time(&t_now);
sl@0: 	/* Check thisUpdate is valid and not more than nsec in the future */
sl@0: 	if (!ASN1_GENERALIZEDTIME_check(thisupd))
sl@0: 		{
sl@0: 		OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);
sl@0: 		ret = 0;
sl@0: 		}
sl@0: 	else 
sl@0: 		{
sl@0: 			t_tmp = t_now + nsec;
sl@0: 			if (X509_cmp_time(thisupd, &t_tmp) > 0)
sl@0: 			{
sl@0: 			OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);
sl@0: 			ret = 0;
sl@0: 			}
sl@0: 
sl@0: 		/* If maxsec specified check thisUpdate is not more than maxsec in the past */
sl@0: 		if (maxsec >= 0)
sl@0: 			{
sl@0: 			t_tmp = t_now - maxsec;
sl@0: 			if (X509_cmp_time(thisupd, &t_tmp) < 0)
sl@0: 				{
sl@0: 				OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);
sl@0: 				ret = 0;
sl@0: 				}
sl@0: 			}
sl@0: 		}
sl@0: 		
sl@0: 
sl@0: 	if (!nextupd) return ret;
sl@0: 
sl@0: 	/* Check nextUpdate is valid and not more than nsec in the past */
sl@0: 	if (!ASN1_GENERALIZEDTIME_check(nextupd))
sl@0: 		{
sl@0: 		OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);
sl@0: 		ret = 0;
sl@0: 		}
sl@0: 	else 
sl@0: 		{
sl@0: 		t_tmp = t_now - nsec;
sl@0: 		if (X509_cmp_time(nextupd, &t_tmp) < 0)
sl@0: 			{
sl@0: 			OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);
sl@0: 			ret = 0;
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	/* Also don't allow nextUpdate to precede thisUpdate */
sl@0: 	if (ASN1_STRING_cmp(nextupd, thisupd) < 0)
sl@0: 		{
sl@0: 		OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);
sl@0: 		ret = 0;
sl@0: 		}
sl@0: 
sl@0: 	return ret;
sl@0: 	}