/* ocsp_ext.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 <cryptlib.h>

#include <openssl/objects.h>

#include <openssl/x509.h>

#include <openssl/ocsp.h>

#include <openssl/rand.h>

#include <openssl/x509v3.h>

/* Standard wrapper functions for extensions */

/* OCSP request extensions */

EXPORT_C int OCSP_REQUEST_get_ext_count(OCSP_REQUEST *x)

	{

	return(X509v3_get_ext_count(x->tbsRequest->requestExtensions));

	}

EXPORT_C int OCSP_REQUEST_get_ext_by_NID(OCSP_REQUEST *x, int nid, int lastpos)

	{

	return(X509v3_get_ext_by_NID(x->tbsRequest->requestExtensions,nid,lastpos));

	}

EXPORT_C int OCSP_REQUEST_get_ext_by_OBJ(OCSP_REQUEST *x, ASN1_OBJECT *obj, int lastpos)

	{

	return(X509v3_get_ext_by_OBJ(x->tbsRequest->requestExtensions,obj,lastpos));

	}

EXPORT_C int OCSP_REQUEST_get_ext_by_critical(OCSP_REQUEST *x, int crit, int lastpos)

	{

	return(X509v3_get_ext_by_critical(x->tbsRequest->requestExtensions,crit,lastpos));

	}

EXPORT_C X509_EXTENSION *OCSP_REQUEST_get_ext(OCSP_REQUEST *x, int loc)

	{

	return(X509v3_get_ext(x->tbsRequest->requestExtensions,loc));

	}

EXPORT_C X509_EXTENSION *OCSP_REQUEST_delete_ext(OCSP_REQUEST *x, int loc)

	{

	return(X509v3_delete_ext(x->tbsRequest->requestExtensions,loc));

	}

EXPORT_C void *OCSP_REQUEST_get1_ext_d2i(OCSP_REQUEST *x, int nid, int *crit, int *idx)

	{

	return X509V3_get_d2i(x->tbsRequest->requestExtensions, nid, crit, idx);

	}

EXPORT_C int OCSP_REQUEST_add1_ext_i2d(OCSP_REQUEST *x, int nid, void *value, int crit,

							unsigned long flags)

	{

	return X509V3_add1_i2d(&x->tbsRequest->requestExtensions, nid, value, crit, flags);

	}

EXPORT_C int OCSP_REQUEST_add_ext(OCSP_REQUEST *x, X509_EXTENSION *ex, int loc)

	{

	return(X509v3_add_ext(&(x->tbsRequest->requestExtensions),ex,loc) != NULL);

	}

/* Single extensions */

EXPORT_C int OCSP_ONEREQ_get_ext_count(OCSP_ONEREQ *x)

	{

	return(X509v3_get_ext_count(x->singleRequestExtensions));

	}

EXPORT_C int OCSP_ONEREQ_get_ext_by_NID(OCSP_ONEREQ *x, int nid, int lastpos)

	{

	return(X509v3_get_ext_by_NID(x->singleRequestExtensions,nid,lastpos));

	}

EXPORT_C int OCSP_ONEREQ_get_ext_by_OBJ(OCSP_ONEREQ *x, ASN1_OBJECT *obj, int lastpos)

	{

	return(X509v3_get_ext_by_OBJ(x->singleRequestExtensions,obj,lastpos));

	}

EXPORT_C int OCSP_ONEREQ_get_ext_by_critical(OCSP_ONEREQ *x, int crit, int lastpos)

	{

	return(X509v3_get_ext_by_critical(x->singleRequestExtensions,crit,lastpos));

	}

EXPORT_C X509_EXTENSION *OCSP_ONEREQ_get_ext(OCSP_ONEREQ *x, int loc)

	{

	return(X509v3_get_ext(x->singleRequestExtensions,loc));

	}

EXPORT_C X509_EXTENSION *OCSP_ONEREQ_delete_ext(OCSP_ONEREQ *x, int loc)

	{

	return(X509v3_delete_ext(x->singleRequestExtensions,loc));

	}

EXPORT_C void *OCSP_ONEREQ_get1_ext_d2i(OCSP_ONEREQ *x, int nid, int *crit, int *idx)

	{

	return X509V3_get_d2i(x->singleRequestExtensions, nid, crit, idx);

	}

EXPORT_C int OCSP_ONEREQ_add1_ext_i2d(OCSP_ONEREQ *x, int nid, void *value, int crit,

							unsigned long flags)

	{

	return X509V3_add1_i2d(&x->singleRequestExtensions, nid, value, crit, flags);

	}

EXPORT_C int OCSP_ONEREQ_add_ext(OCSP_ONEREQ *x, X509_EXTENSION *ex, int loc)

	{

	return(X509v3_add_ext(&(x->singleRequestExtensions),ex,loc) != NULL);

	}

/* OCSP Basic response */

EXPORT_C int OCSP_BASICRESP_get_ext_count(OCSP_BASICRESP *x)

	{

	return(X509v3_get_ext_count(x->tbsResponseData->responseExtensions));

	}

EXPORT_C int OCSP_BASICRESP_get_ext_by_NID(OCSP_BASICRESP *x, int nid, int lastpos)

	{

	return(X509v3_get_ext_by_NID(x->tbsResponseData->responseExtensions,nid,lastpos));

	}

EXPORT_C int OCSP_BASICRESP_get_ext_by_OBJ(OCSP_BASICRESP *x, ASN1_OBJECT *obj, int lastpos)

	{

	return(X509v3_get_ext_by_OBJ(x->tbsResponseData->responseExtensions,obj,lastpos));

	}

EXPORT_C int OCSP_BASICRESP_get_ext_by_critical(OCSP_BASICRESP *x, int crit, int lastpos)

	{

	return(X509v3_get_ext_by_critical(x->tbsResponseData->responseExtensions,crit,lastpos));

	}

EXPORT_C X509_EXTENSION *OCSP_BASICRESP_get_ext(OCSP_BASICRESP *x, int loc)

	{

	return(X509v3_get_ext(x->tbsResponseData->responseExtensions,loc));

	}

EXPORT_C X509_EXTENSION *OCSP_BASICRESP_delete_ext(OCSP_BASICRESP *x, int loc)

	{

	return(X509v3_delete_ext(x->tbsResponseData->responseExtensions,loc));

	}

EXPORT_C void *OCSP_BASICRESP_get1_ext_d2i(OCSP_BASICRESP *x, int nid, int *crit, int *idx)

	{

	return X509V3_get_d2i(x->tbsResponseData->responseExtensions, nid, crit, idx);

	}

EXPORT_C int OCSP_BASICRESP_add1_ext_i2d(OCSP_BASICRESP *x, int nid, void *value, int crit,

							unsigned long flags)

	{

	return X509V3_add1_i2d(&x->tbsResponseData->responseExtensions, nid, value, crit, flags);

	}

EXPORT_C int OCSP_BASICRESP_add_ext(OCSP_BASICRESP *x, X509_EXTENSION *ex, int loc)

	{

	return(X509v3_add_ext(&(x->tbsResponseData->responseExtensions),ex,loc) != NULL);

	}

/* OCSP single response extensions */

EXPORT_C int OCSP_SINGLERESP_get_ext_count(OCSP_SINGLERESP *x)

	{

	return(X509v3_get_ext_count(x->singleExtensions));

	}

EXPORT_C int OCSP_SINGLERESP_get_ext_by_NID(OCSP_SINGLERESP *x, int nid, int lastpos)

	{

	return(X509v3_get_ext_by_NID(x->singleExtensions,nid,lastpos));

	}

EXPORT_C int OCSP_SINGLERESP_get_ext_by_OBJ(OCSP_SINGLERESP *x, ASN1_OBJECT *obj, int lastpos)

	{

	return(X509v3_get_ext_by_OBJ(x->singleExtensions,obj,lastpos));

	}

EXPORT_C int OCSP_SINGLERESP_get_ext_by_critical(OCSP_SINGLERESP *x, int crit, int lastpos)

	{

	return(X509v3_get_ext_by_critical(x->singleExtensions,crit,lastpos));

	}

EXPORT_C X509_EXTENSION *OCSP_SINGLERESP_get_ext(OCSP_SINGLERESP *x, int loc)

	{

	return(X509v3_get_ext(x->singleExtensions,loc));

	}

EXPORT_C X509_EXTENSION *OCSP_SINGLERESP_delete_ext(OCSP_SINGLERESP *x, int loc)

	{

	return(X509v3_delete_ext(x->singleExtensions,loc));

	}

EXPORT_C void *OCSP_SINGLERESP_get1_ext_d2i(OCSP_SINGLERESP *x, int nid, int *crit, int *idx)

	{

	return X509V3_get_d2i(x->singleExtensions, nid, crit, idx);

	}

EXPORT_C int OCSP_SINGLERESP_add1_ext_i2d(OCSP_SINGLERESP *x, int nid, void *value, int crit,

							unsigned long flags)

	{

	return X509V3_add1_i2d(&x->singleExtensions, nid, value, crit, flags);

	}

EXPORT_C int OCSP_SINGLERESP_add_ext(OCSP_SINGLERESP *x, X509_EXTENSION *ex, int loc)

	{

	return(X509v3_add_ext(&(x->singleExtensions),ex,loc) != NULL);

	}

/* also CRL Entry Extensions */

EXPORT_C ASN1_STRING *ASN1_STRING_encode(ASN1_STRING *s, i2d_of_void *i2d,

				void *data, STACK_OF(ASN1_OBJECT) *sk)

        {

	int i;

	unsigned char *p, *b = NULL;

	if (data)

	        {

		if ((i=i2d(data,NULL)) <= 0) goto err;

		if (!(b=p=OPENSSL_malloc((unsigned int)i)))

			goto err;

	        if (i2d(data, &p) <= 0) goto err;

		}

	else if (sk)

	        {

		if ((i=i2d_ASN1_SET_OF_ASN1_OBJECT(sk,NULL,

						   (I2D_OF(ASN1_OBJECT))i2d,

						   V_ASN1_SEQUENCE,

						   V_ASN1_UNIVERSAL,

						   IS_SEQUENCE))<=0) goto err;

		if (!(b=p=OPENSSL_malloc((unsigned int)i)))

			goto err;

		if (i2d_ASN1_SET_OF_ASN1_OBJECT(sk,&p,(I2D_OF(ASN1_OBJECT))i2d,

						V_ASN1_SEQUENCE,

						V_ASN1_UNIVERSAL,

						IS_SEQUENCE)<=0) goto err;

		}

	else

		{

		OCSPerr(OCSP_F_ASN1_STRING_ENCODE,OCSP_R_BAD_DATA);

		goto err;

		}

	if (!s && !(s = ASN1_STRING_new())) goto err;

	if (!(ASN1_STRING_set(s, b, i))) goto err;

	OPENSSL_free(b);

	return s;

err:

	if (b) OPENSSL_free(b);

	return NULL;

	}

/* Nonce handling functions */

/* Add a nonce to an extension stack. A nonce can be specificed or if NULL

 * a random nonce will be generated.

 * Note: OpenSSL 0.9.7d and later create an OCTET STRING containing the 

 * nonce, previous versions used the raw nonce.

 */

static int ocsp_add1_nonce(STACK_OF(X509_EXTENSION) **exts, unsigned char *val, int len)

	{

	unsigned char *tmpval;

	ASN1_OCTET_STRING os;

	int ret = 0;

	if (len <= 0) len = OCSP_DEFAULT_NONCE_LENGTH;

	/* Create the OCTET STRING manually by writing out the header and

	 * appending the content octets. This avoids an extra memory allocation

	 * operation in some cases. Applications should *NOT* do this because

         * it relies on library internals.

	 */

	os.length = ASN1_object_size(0, len, V_ASN1_OCTET_STRING);

	os.data = OPENSSL_malloc(os.length);

	if (os.data == NULL)

		goto err;

	tmpval = os.data;

	ASN1_put_object(&tmpval, 0, len, V_ASN1_OCTET_STRING, V_ASN1_UNIVERSAL);

	if (val)

		memcpy(tmpval, val, len);

	else

		RAND_pseudo_bytes(tmpval, len);

	if(!X509V3_add1_i2d(exts, NID_id_pkix_OCSP_Nonce,

			&os, 0, X509V3_ADD_REPLACE))

				goto err;

	ret = 1;

	err:

	if (os.data)

		OPENSSL_free(os.data);

	return ret;

	}

/* Add nonce to an OCSP request */

EXPORT_C int OCSP_request_add1_nonce(OCSP_REQUEST *req, unsigned char *val, int len)

	{

	return ocsp_add1_nonce(&req->tbsRequest->requestExtensions, val, len);

	}

/* Same as above but for a response */

EXPORT_C int OCSP_basic_add1_nonce(OCSP_BASICRESP *resp, unsigned char *val, int len)

	{

	return ocsp_add1_nonce(&resp->tbsResponseData->responseExtensions, val, len);

	}

/* Check nonce validity in a request and response.

 * Return value reflects result:

 *  1: nonces present and equal.

 *  2: nonces both absent.

 *  3: nonce present in response only.

 *  0: nonces both present and not equal.

 * -1: nonce in request only.

 *

 *  For most responders clients can check return > 0.

 *  If responder doesn't handle nonces return != 0 may be

 *  necessary. return == 0 is always an error.

 */

EXPORT_C int OCSP_check_nonce(OCSP_REQUEST *req, OCSP_BASICRESP *bs)

	{

	/*

	 * Since we are only interested in the presence or absence of

	 * the nonce and comparing its value there is no need to use

	 * the X509V3 routines: this way we can avoid them allocating an

	 * ASN1_OCTET_STRING structure for the value which would be

	 * freed immediately anyway.

	 */

	int req_idx, resp_idx;

	X509_EXTENSION *req_ext, *resp_ext;

	req_idx = OCSP_REQUEST_get_ext_by_NID(req, NID_id_pkix_OCSP_Nonce, -1);

	resp_idx = OCSP_BASICRESP_get_ext_by_NID(bs, NID_id_pkix_OCSP_Nonce, -1);

	/* Check both absent */

	if((req_idx < 0) && (resp_idx < 0))

		return 2;

	/* Check in request only */

	if((req_idx >= 0) && (resp_idx < 0))

		return -1;

	/* Check in response but not request */

	if((req_idx < 0) && (resp_idx >= 0))

		return 3;

	/* Otherwise nonce in request and response so retrieve the extensions */

	req_ext = OCSP_REQUEST_get_ext(req, req_idx);

	resp_ext = OCSP_BASICRESP_get_ext(bs, resp_idx);

	if(ASN1_OCTET_STRING_cmp(req_ext->value, resp_ext->value))

		return 0;

	return 1;

	}

/* Copy the nonce value (if any) from an OCSP request to 

 * a response.

 */

EXPORT_C int OCSP_copy_nonce(OCSP_BASICRESP *resp, OCSP_REQUEST *req)

	{

	X509_EXTENSION *req_ext;

	int req_idx;

	/* Check for nonce in request */

	req_idx = OCSP_REQUEST_get_ext_by_NID(req, NID_id_pkix_OCSP_Nonce, -1);

	/* If no nonce that's OK */

	if (req_idx < 0) return 2;

	req_ext = OCSP_REQUEST_get_ext(req, req_idx);

	return OCSP_BASICRESP_add_ext(resp, req_ext, -1);

	}

EXPORT_C X509_EXTENSION *OCSP_crlID_new(char *url, long *n, char *tim)

        {

	X509_EXTENSION *x = NULL;

	OCSP_CRLID *cid = NULL;

	if (!(cid = OCSP_CRLID_new())) goto err;

	if (url)

	        {

		if (!(cid->crlUrl = ASN1_IA5STRING_new())) goto err;

		if (!(ASN1_STRING_set(cid->crlUrl, url, -1))) goto err;

		}

	if (n)

	        {

		if (!(cid->crlNum = ASN1_INTEGER_new())) goto err;

		if (!(ASN1_INTEGER_set(cid->crlNum, *n))) goto err;

		}

	if (tim)

	        {

		if (!(cid->crlTime = ASN1_GENERALIZEDTIME_new())) goto err;

		if (!(ASN1_GENERALIZEDTIME_set_string(cid->crlTime, tim))) 

		        goto err;

		}

	if (!(x = X509_EXTENSION_new())) goto err;

	if (!(x->object = OBJ_nid2obj(NID_id_pkix_OCSP_CrlID))) goto err;

	if (!(ASN1_STRING_encode_of(OCSP_CRLID,x->value,i2d_OCSP_CRLID,cid,

				    NULL)))

	        goto err;

	OCSP_CRLID_free(cid);

	return x;

err:

	if (x) X509_EXTENSION_free(x);

	if (cid) OCSP_CRLID_free(cid);

	return NULL;

	}

/*   AcceptableResponses ::= SEQUENCE OF OBJECT IDENTIFIER */

EXPORT_C X509_EXTENSION *OCSP_accept_responses_new(char **oids)

        {

	int nid;

	STACK_OF(ASN1_OBJECT) *sk = NULL;

	ASN1_OBJECT *o = NULL;

        X509_EXTENSION *x = NULL;

	if (!(sk = sk_ASN1_OBJECT_new_null())) goto err;

	while (oids && *oids)

	        {

		if ((nid=OBJ_txt2nid(*oids))!=NID_undef&&(o=OBJ_nid2obj(nid))) 

		        sk_ASN1_OBJECT_push(sk, o);

		oids++;

		}

	if (!(x = X509_EXTENSION_new())) goto err;

	if (!(x->object = OBJ_nid2obj(NID_id_pkix_OCSP_acceptableResponses)))

		goto err;

	if (!(ASN1_STRING_encode_of(ASN1_OBJECT,x->value,i2d_ASN1_OBJECT,NULL,

				    sk)))

	        goto err;

	sk_ASN1_OBJECT_pop_free(sk, ASN1_OBJECT_free);

	return x;

err:

	if (x) X509_EXTENSION_free(x);

	if (sk) sk_ASN1_OBJECT_pop_free(sk, ASN1_OBJECT_free);

	return NULL;

        }

/*  ArchiveCutoff ::= GeneralizedTime */

EXPORT_C X509_EXTENSION *OCSP_archive_cutoff_new(char* tim)

        {

	X509_EXTENSION *x=NULL;

	ASN1_GENERALIZEDTIME *gt = NULL;

	if (!(gt = ASN1_GENERALIZEDTIME_new())) goto err;

	if (!(ASN1_GENERALIZEDTIME_set_string(gt, tim))) goto err;

	if (!(x = X509_EXTENSION_new())) goto err;

	if (!(x->object=OBJ_nid2obj(NID_id_pkix_OCSP_archiveCutoff)))goto err;

	if (!(ASN1_STRING_encode_of(ASN1_GENERALIZEDTIME,x->value,

				    i2d_ASN1_GENERALIZEDTIME,gt,NULL))) goto err;

	ASN1_GENERALIZEDTIME_free(gt);

	return x;

err:

	if (gt) ASN1_GENERALIZEDTIME_free(gt);

	if (x) X509_EXTENSION_free(x);

	return NULL;

	}

/* per ACCESS_DESCRIPTION parameter are oids, of which there are currently

 * two--NID_ad_ocsp, NID_id_ad_caIssuers--and GeneralName value.  This

 * method forces NID_ad_ocsp and uniformResourceLocator [6] IA5String.

 */

EXPORT_C X509_EXTENSION *OCSP_url_svcloc_new(X509_NAME* issuer, char **urls)

        {

	X509_EXTENSION *x = NULL;

	ASN1_IA5STRING *ia5 = NULL;

	OCSP_SERVICELOC *sloc = NULL;

	ACCESS_DESCRIPTION *ad = NULL;

	if (!(sloc = OCSP_SERVICELOC_new())) goto err;

	if (!(sloc->issuer = X509_NAME_dup(issuer))) goto err;

	if (urls && *urls && !(sloc->locator = sk_ACCESS_DESCRIPTION_new_null())) goto err;

	while (urls && *urls)

	        {

		if (!(ad = ACCESS_DESCRIPTION_new())) goto err;

		if (!(ad->method=OBJ_nid2obj(NID_ad_OCSP))) goto err;

		if (!(ad->location = GENERAL_NAME_new())) goto err;

	        if (!(ia5 = ASN1_IA5STRING_new())) goto err;

		if (!ASN1_STRING_set((ASN1_STRING*)ia5, *urls, -1)) goto err;

		ad->location->type = GEN_URI;

		ad->location->d.ia5 = ia5;

		if (!sk_ACCESS_DESCRIPTION_push(sloc->locator, ad)) goto err;

		urls++;

		}

	if (!(x = X509_EXTENSION_new())) goto err;

	if (!(x->object = OBJ_nid2obj(NID_id_pkix_OCSP_serviceLocator))) 

	        goto err;

	if (!(ASN1_STRING_encode_of(OCSP_SERVICELOC,x->value,

				    i2d_OCSP_SERVICELOC,sloc,NULL))) goto err;

	OCSP_SERVICELOC_free(sloc);

	return x;

err:

	if (x) X509_EXTENSION_free(x);

	if (sloc) OCSP_SERVICELOC_free(sloc);

	return NULL;

	}