/* 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 */

int OCSP_REQUEST_get_ext_count(OCSP_REQUEST *x)
	{
	return(X509v3_get_ext_count(x->tbsRequest->requestExtensions));
	}

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));
	}

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));
	}

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));
	}

X509_EXTENSION *OCSP_REQUEST_get_ext(OCSP_REQUEST *x, int loc)
	{
	return(X509v3_get_ext(x->tbsRequest->requestExtensions,loc));
	}

X509_EXTENSION *OCSP_REQUEST_delete_ext(OCSP_REQUEST *x, int loc)
	{
	return(X509v3_delete_ext(x->tbsRequest->requestExtensions,loc));
	}

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);
	}

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);
	}

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 */

int OCSP_ONEREQ_get_ext_count(OCSP_ONEREQ *x)
	{
	return(X509v3_get_ext_count(x->singleRequestExtensions));
	}

int OCSP_ONEREQ_get_ext_by_NID(OCSP_ONEREQ *x, int nid, int lastpos)
	{
	return(X509v3_get_ext_by_NID(x->singleRequestExtensions,nid,lastpos));
	}

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));
	}

int OCSP_ONEREQ_get_ext_by_critical(OCSP_ONEREQ *x, int crit, int lastpos)
	{
	return(X509v3_get_ext_by_critical(x->singleRequestExtensions,crit,lastpos));
	}

X509_EXTENSION *OCSP_ONEREQ_get_ext(OCSP_ONEREQ *x, int loc)
	{
	return(X509v3_get_ext(x->singleRequestExtensions,loc));
	}

X509_EXTENSION *OCSP_ONEREQ_delete_ext(OCSP_ONEREQ *x, int loc)
	{
	return(X509v3_delete_ext(x->singleRequestExtensions,loc));
	}

void *OCSP_ONEREQ_get1_ext_d2i(OCSP_ONEREQ *x, int nid, int *crit, int *idx)
	{
	return X509V3_get_d2i(x->singleRequestExtensions, nid, crit, idx);
	}

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);
	}

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 */

int OCSP_BASICRESP_get_ext_count(OCSP_BASICRESP *x)
	{
	return(X509v3_get_ext_count(x->tbsResponseData->responseExtensions));
	}

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));
	}

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));
	}

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));
	}

X509_EXTENSION *OCSP_BASICRESP_get_ext(OCSP_BASICRESP *x, int loc)
	{
	return(X509v3_get_ext(x->tbsResponseData->responseExtensions,loc));
	}

X509_EXTENSION *OCSP_BASICRESP_delete_ext(OCSP_BASICRESP *x, int loc)
	{
	return(X509v3_delete_ext(x->tbsResponseData->responseExtensions,loc));
	}

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);
	}

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);
	}

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 */

int OCSP_SINGLERESP_get_ext_count(OCSP_SINGLERESP *x)
	{
	return(X509v3_get_ext_count(x->singleExtensions));
	}

int OCSP_SINGLERESP_get_ext_by_NID(OCSP_SINGLERESP *x, int nid, int lastpos)
	{
	return(X509v3_get_ext_by_NID(x->singleExtensions,nid,lastpos));
	}

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));
	}

int OCSP_SINGLERESP_get_ext_by_critical(OCSP_SINGLERESP *x, int crit, int lastpos)
	{
	return(X509v3_get_ext_by_critical(x->singleExtensions,crit,lastpos));
	}

X509_EXTENSION *OCSP_SINGLERESP_get_ext(OCSP_SINGLERESP *x, int loc)
	{
	return(X509v3_get_ext(x->singleExtensions,loc));
	}

X509_EXTENSION *OCSP_SINGLERESP_delete_ext(OCSP_SINGLERESP *x, int loc)
	{
	return(X509v3_delete_ext(x->singleExtensions,loc));
	}

void *OCSP_SINGLERESP_get1_ext_d2i(OCSP_SINGLERESP *x, int nid, int *crit, int *idx)
	{
	return X509V3_get_d2i(x->singleExtensions, nid, crit, idx);
	}

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);
	}

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 */

ASN1_STRING *ASN1_STRING_encode(ASN1_STRING *s, int (*i2d)(), 
				char *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=(unsigned char*)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,V_ASN1_SEQUENCE,
				   V_ASN1_UNIVERSAL,IS_SEQUENCE))<=0) goto err;
		if (!(b=p=(unsigned char*)OPENSSL_malloc((unsigned int)i)))
			goto err;
		if (i2d_ASN1_SET_OF_ASN1_OBJECT(sk,&p,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.
 */

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;
	if (val) tmpval = val;
	else
		{
		if (!(tmpval = OPENSSL_malloc(len))) goto err;
		RAND_pseudo_bytes(tmpval, len);
		}
	os.data = tmpval;
	os.length = len;
	if(!X509V3_add1_i2d(exts, NID_id_pkix_OCSP_Nonce,
			&os, 0, X509V3_ADD_REPLACE))
				goto err;
	ret = 1;
	err:
	if(!val) OPENSSL_free(tmpval);
	return ret;
	}


/* Add nonce to an OCSP request */

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 */

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.
 */

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.
 */

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);
	}

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(x->value,i2d_OCSP_CRLID,(char*)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 */
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(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 */
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(x->value,i2d_ASN1_GENERALIZEDTIME,
				 (char*)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.
 */
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(x->value, i2d_OCSP_SERVICELOC,
				 (char*)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;
	}