text: /* $OpenBSD: ocsp_ext.c,v 1.10 2014/07/10 13:58:23 jsing Exp $ */
  /* 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 <string.h>
  
  #include <openssl/objects.h>
  #include <openssl/ocsp.h>
  #include <openssl/rand.h>
  #include <openssl/x509.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 */
  #if 0
  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 = 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 = 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;
  	free(b);
  	return s;
  
  err:
  	free(b);
  	return NULL;
  }
  #endif
  
  /* 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 = 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:
  	free(os.data);
  	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;
  	}
  	x = X509V3_EXT_i2d(NID_id_pkix_OCSP_CrlID, 0, cid);
  
  err:
  	if (cid)
  		OCSP_CRLID_free(cid);
  	return x;
  }
  
  /*   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()))
  		return NULL;
  	while (oids && *oids) {
  		if ((nid = OBJ_txt2nid(*oids)) != NID_undef &&
  		    (o = OBJ_nid2obj(nid)))
  			sk_ASN1_OBJECT_push(sk, o);
  		oids++;
  	}
  	x = X509V3_EXT_i2d(NID_id_pkix_OCSP_acceptableResponses, 0, sk);
  	sk_ASN1_OBJECT_pop_free(sk, ASN1_OBJECT_free);
  	return x;
  }
  
  /*  ArchiveCutoff ::= GeneralizedTime */
  X509_EXTENSION *
  OCSP_archive_cutoff_new(char* tim)
  {
  	X509_EXTENSION *x = NULL;
  	ASN1_GENERALIZEDTIME *gt = NULL;
  
  	if (!(gt = ASN1_GENERALIZEDTIME_new()))
  		return NULL;
  	if (!(ASN1_GENERALIZEDTIME_set_string(gt, tim)))
  		goto err;
  	x = X509V3_EXT_i2d(NID_id_pkix_OCSP_archiveCutoff, 0, gt);
  
  err:
  	if (gt)
  		ASN1_GENERALIZEDTIME_free(gt);
  	return x;
  }
  
  /* 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;
  		ia5 = NULL;
  		if (!sk_ACCESS_DESCRIPTION_push(sloc->locator, ad))
  			goto err;
  		ad = NULL;
  		urls++;
  	}
  	x = X509V3_EXT_i2d(NID_id_pkix_OCSP_serviceLocator, 0, sloc);
  
  err:
  	if (ia5)
  		ASN1_IA5STRING_free(ia5);
  	if (ad)
  		ACCESS_DESCRIPTION_free(ad);
  	if (sloc)
  		OCSP_SERVICELOC_free(sloc);
  	return x;
  }
  