/* ocsp_cl.c */

 /* Written by Tom Titchener <Tom_Titchener@groove.net> for the OpenSSL

  * project. */

 /* History:

    This file was transfered to Richard Levitte from CertCo by Kathy

    Weinhold in mid-spring 2000 to be included in OpenSSL or released

    as a patch kit. */

 /* ====================================================================

  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  *

  * 1. Redistributions of source code must retain the above copyright

  *    notice, this list of conditions and the following disclaimer. 

  *

  * 2. Redistributions in binary form must reproduce the above copyright

  *    notice, this list of conditions and the following disclaimer in

  *    the documentation and/or other materials provided with the

  *    distribution.

  *

  * 3. All advertising materials mentioning features or use of this

  *    software must display the following acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

  *

  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

  *    endorse or promote products derived from this software without

  *    prior written permission. For written permission, please contact

  *    openssl-core@openssl.org.

  *

  * 5. Products derived from this software may not be called "OpenSSL"

  *    nor may "OpenSSL" appear in their names without prior written

  *    permission of the OpenSSL Project.

  *

  * 6. Redistributions of any form whatsoever must retain the following

  *    acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"

  *

  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

  * OF THE POSSIBILITY OF SUCH DAMAGE.

  * ====================================================================

  *

  * This product includes cryptographic software written by Eric Young

  * (eay@cryptsoft.com).  This product includes software written by Tim

  * Hudson (tjh@cryptsoft.com).

  *

  */

 #include <stdio.h>

 #include <time.h>

 #include <cryptlib.h>

 #include <openssl/objects.h>

 #include <openssl/rand.h>

 #include <openssl/x509.h>

 #include <openssl/pem.h>

 #include <openssl/x509v3.h>

 #include <openssl/ocsp.h>

 /* Utility functions related to sending OCSP requests and extracting

  * relevant information from the response.

  */

 /* Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ 

  * pointer: useful if we want to add extensions.

  */

 EXPORT_C OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)

         {

 	OCSP_ONEREQ *one = NULL;

 	if (!(one = OCSP_ONEREQ_new())) goto err;

 	if (one->reqCert) OCSP_CERTID_free(one->reqCert);

 	one->reqCert = cid;

 	if (req &&

 		!sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one))

 				goto err;

 	return one;

 err:

 	OCSP_ONEREQ_free(one);

 	return NULL;

         }

 /* Set requestorName from an X509_NAME structure */

 EXPORT_C int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm)

 	{

 	GENERAL_NAME *gen;

 	gen = GENERAL_NAME_new();

 	if (gen == NULL)

 		return 0;

 	if (!X509_NAME_set(&gen->d.directoryName, nm))

 		{

 		GENERAL_NAME_free(gen);

 		return 0;

 		}

 	gen->type = GEN_DIRNAME;

 	if (req->tbsRequest->requestorName)

 		GENERAL_NAME_free(req->tbsRequest->requestorName);

 	req->tbsRequest->requestorName = gen;

 	return 1;

 	}

 /* Add a certificate to an OCSP request */

 EXPORT_C int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)

 	{

 	OCSP_SIGNATURE *sig;

 	if (!req->optionalSignature)

 		req->optionalSignature = OCSP_SIGNATURE_new();

 	sig = req->optionalSignature;

 	if (!sig) return 0;

 	if (!cert) return 1;

 	if (!sig->certs && !(sig->certs = sk_X509_new_null()))

 		return 0;

 	if(!sk_X509_push(sig->certs, cert)) return 0;

 	CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);

 	return 1;

 	}

 /* Sign an OCSP request set the requestorName to the subjec

  * name of an optional signers certificate and include one

  * or more optional certificates in the request. Behaves

  * like PKCS7_sign().

  */

 EXPORT_C int OCSP_request_sign(OCSP_REQUEST   *req,

 		      X509           *signer,

 		      EVP_PKEY       *key,

 		      const EVP_MD   *dgst,

 		      STACK_OF(X509) *certs,

 		      unsigned long flags)

         {

 	int i;

 	OCSP_SIGNATURE *sig;

 	X509 *x;

 	if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))

 			goto err;

 	if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) goto err;

 	if (!dgst) dgst = EVP_sha1();

 	if (key)

 		{

 		if (!X509_check_private_key(signer, key))

 			{

 			OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);

 			goto err;

 			}

 		if (!OCSP_REQUEST_sign(req, key, dgst)) goto err;

 		}

 	if (!(flags & OCSP_NOCERTS))

 		{

 		if(!OCSP_request_add1_cert(req, signer)) goto err;

 		for (i = 0; i < sk_X509_num(certs); i++)

 			{

 			x = sk_X509_value(certs, i);

 			if (!OCSP_request_add1_cert(req, x)) goto err;

 			}

 		}

 	return 1;

 err:

 	OCSP_SIGNATURE_free(req->optionalSignature);

 	req->optionalSignature = NULL;

 	return 0;

 	}

 /* Get response status */

 EXPORT_C int OCSP_response_status(OCSP_RESPONSE *resp)

 	{

 	return ASN1_ENUMERATED_get(resp->responseStatus);

 	}

 /* Extract basic response from OCSP_RESPONSE or NULL if

  * no basic response present.

  */

 EXPORT_C OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)

 	{

 	OCSP_RESPBYTES *rb;

 	rb = resp->responseBytes;

 	if (!rb)

 		{

 		OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);

 		return NULL;

 		}

 	if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic)

 		{

 		OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);

 		return NULL;

 		}

 	return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));

 	}

 /* Return number of OCSP_SINGLERESP reponses present in

  * a basic response.

  */

 EXPORT_C int OCSP_resp_count(OCSP_BASICRESP *bs)

 	{

 	if (!bs) return -1;

 	return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses);

 	}

 /* Extract an OCSP_SINGLERESP response with a given index */

 EXPORT_C OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)

 	{

 	if (!bs) return NULL;

 	return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx);

 	}

 /* Look single response matching a given certificate ID */

 EXPORT_C int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)

 	{

 	int i;

 	STACK_OF(OCSP_SINGLERESP) *sresp;

 	OCSP_SINGLERESP *single;

 	if (!bs) return -1;

 	if (last < 0) last = 0;

 	else last++;

 	sresp = bs->tbsResponseData->responses;

 	for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++)

 		{

 		single = sk_OCSP_SINGLERESP_value(sresp, i);

 		if (!OCSP_id_cmp(id, single->certId)) return i;

 		}

 	return -1;

 	}

 /* Extract status information from an OCSP_SINGLERESP structure.

  * Note: the revtime and reason values are only set if the 

  * certificate status is revoked. Returns numerical value of

  * status.

  */

 EXPORT_C int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,

 				ASN1_GENERALIZEDTIME **revtime,

 				ASN1_GENERALIZEDTIME **thisupd,

 				ASN1_GENERALIZEDTIME **nextupd)

 	{

 	int ret;

 	OCSP_CERTSTATUS *cst;

 	if(!single) return -1;

 	cst = single->certStatus;

 	ret = cst->type;

 	if (ret == V_OCSP_CERTSTATUS_REVOKED)

 		{

 		OCSP_REVOKEDINFO *rev = cst->value.revoked;

 		if (revtime) *revtime = rev->revocationTime;

 		if (reason) 

 			{

 			if(rev->revocationReason)

 				*reason = ASN1_ENUMERATED_get(rev->revocationReason);

 			else *reason = -1;

 			}

 		}

 	if(thisupd) *thisupd = single->thisUpdate;

 	if(nextupd) *nextupd = single->nextUpdate;

 	return ret;

 	}

 /* This function combines the previous ones: look up a certificate ID and

  * if found extract status information. Return 0 is successful.

  */

 EXPORT_C int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,

 				int *reason,

 				ASN1_GENERALIZEDTIME **revtime,

 				ASN1_GENERALIZEDTIME **thisupd,

 				ASN1_GENERALIZEDTIME **nextupd)

 	{

 	int i;

 	OCSP_SINGLERESP *single;

 	i = OCSP_resp_find(bs, id, -1);

 	/* Maybe check for multiple responses and give an error? */

 	if(i < 0) return 0;

 	single = OCSP_resp_get0(bs, i);

 	i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);

 	if(status) *status = i;

 	return 1;

 	}

 /* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will

  * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid

  * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time.

  * Also to avoid accepting very old responses without a nextUpdate field an optional maxage

  * parameter specifies the maximum age the thisUpdate field can be.

  */

 EXPORT_C int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)

 	{

 	int ret = 1;

 	time_t t_now, t_tmp;

 	time(&t_now);

 	/* Check thisUpdate is valid and not more than nsec in the future */

 	if (!ASN1_GENERALIZEDTIME_check(thisupd))

 		{

 		OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);

 		ret = 0;

 		}

 	else 

 		{

 			t_tmp = t_now + nsec;

 			if (X509_cmp_time(thisupd, &t_tmp) > 0)

 			{

 			OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);

 			ret = 0;

 			}

 		/* If maxsec specified check thisUpdate is not more than maxsec in the past */

 		if (maxsec >= 0)

 			{

 			t_tmp = t_now - maxsec;

 			if (X509_cmp_time(thisupd, &t_tmp) < 0)

 				{

 				OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);

 				ret = 0;

 				}

 			}

 		}

 	if (!nextupd) return ret;

 	/* Check nextUpdate is valid and not more than nsec in the past */

 	if (!ASN1_GENERALIZEDTIME_check(nextupd))

 		{

 		OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);

 		ret = 0;

 		}

 	else 

 		{

 		t_tmp = t_now - nsec;

 		if (X509_cmp_time(nextupd, &t_tmp) < 0)

 			{

 			OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);

 			ret = 0;

 			}

 		}

 	/* Also don't allow nextUpdate to precede thisUpdate */

 	if (ASN1_STRING_cmp(nextupd, thisupd) < 0)

 		{

 		OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);

 		ret = 0;

 		}

 	return ret;

 	}