crypto/x509/x509_vpm.c - boringssl - Git at Google

 /*
  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
  * 2004.
  */
 /* ====================================================================
  * Copyright (c) 2004 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
  *    licensing@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 <string.h>

 #include <openssl/mem.h>
 #include <openssl/obj.h>
 #include <openssl/stack.h>
 #include <openssl/x509.h>

 #include "../internal.h"
 #include "internal.h"


 // X509_VERIFY_PARAM functions

 #define SET_HOST 0
 #define ADD_HOST 1

 static void str_free(char *s) { OPENSSL_free(s); }

 static int int_x509_param_set_hosts(X509_VERIFY_PARAM *param, int mode,
                                     const char *name, size_t namelen) {
   char *copy;

   if (name == NULL || namelen == 0) {
     // Unlike OpenSSL, we reject trying to set or add an empty name.
     return 0;
   }

   // Refuse names with embedded NUL bytes.
   // XXX: Do we need to push an error onto the error stack?
   if (name && OPENSSL_memchr(name, '\0', namelen)) {
     return 0;
   }

   if (mode == SET_HOST && param->hosts) {
     sk_OPENSSL_STRING_pop_free(param->hosts, str_free);
     param->hosts = NULL;
   }

   copy = OPENSSL_strndup(name, namelen);
   if (copy == NULL) {
     return 0;
   }

   if (param->hosts == NULL &&
       (param->hosts = sk_OPENSSL_STRING_new_null()) == NULL) {
     OPENSSL_free(copy);
     return 0;
   }

   if (!sk_OPENSSL_STRING_push(param->hosts, copy)) {
     OPENSSL_free(copy);
     if (sk_OPENSSL_STRING_num(param->hosts) == 0) {
       sk_OPENSSL_STRING_free(param->hosts);
       param->hosts = NULL;
     }
     return 0;
   }

   return 1;
 }

 X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void) {
   X509_VERIFY_PARAM *param = OPENSSL_zalloc(sizeof(X509_VERIFY_PARAM));
   if (!param) {
     return NULL;
   }
   param->depth = -1;
   return param;
 }

 void X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param) {
   if (param == NULL) {
     return;
   }
   sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
   sk_OPENSSL_STRING_pop_free(param->hosts, str_free);
   OPENSSL_free(param->email);
   OPENSSL_free(param->ip);
   OPENSSL_free(param);
 }

 static int should_copy(int dest_is_set, int src_is_set, int prefer_src) {
   if (prefer_src) {
     // We prefer the source, so as long as there is a value to copy, copy it.
     return src_is_set;
   }

   // We prefer the destination, so only copy if the destination is unset.
   return src_is_set && !dest_is_set;
 }

 static void copy_int_param(int *dest, const int *src, int default_val,
                            int prefer_src) {
   if (should_copy(*dest != default_val, *src != default_val, prefer_src)) {
     *dest = *src;
   }
 }

 // x509_verify_param_copy copies fields from |src| to |dest|. If both |src| and
 // |dest| have some field set, |prefer_src| determines whether |src| or |dest|'s
 // version is used.
 static int x509_verify_param_copy(X509_VERIFY_PARAM *dest,
                                   const X509_VERIFY_PARAM *src,
                                   int prefer_src) {
   if (src == NULL) {
     return 1;
   }

   copy_int_param(&dest->purpose, &src->purpose, /*default_val=*/0, prefer_src);
   copy_int_param(&dest->trust, &src->trust, /*default_val=*/0, prefer_src);
   copy_int_param(&dest->depth, &src->depth, /*default_val=*/-1, prefer_src);

   // |check_time|, unlike all other parameters, does not honor |prefer_src|.
   // This means |X509_VERIFY_PARAM_set1| will not overwrite it. This behavior
   // comes from OpenSSL but may have been a bug.
   if (!(dest->flags & X509_V_FLAG_USE_CHECK_TIME)) {
     dest->check_time = src->check_time;
     // The source |X509_V_FLAG_USE_CHECK_TIME| flag, if set, is copied below.
   }

   dest->flags |= src->flags;

   if (should_copy(dest->policies != NULL, src->policies != NULL, prefer_src)) {
     if (!X509_VERIFY_PARAM_set1_policies(dest, src->policies)) {
       return 0;
     }
   }

   if (should_copy(dest->hosts != NULL, src->hosts != NULL, prefer_src)) {
     sk_OPENSSL_STRING_pop_free(dest->hosts, str_free);
     dest->hosts = NULL;
     if (src->hosts) {
       dest->hosts =
           sk_OPENSSL_STRING_deep_copy(src->hosts, OPENSSL_strdup, str_free);
       if (dest->hosts == NULL) {
         return 0;
       }
       // Copy the host flags if and only if we're copying the host list. Note
       // this means mechanisms like |X509_STORE_CTX_set_default| cannot be used
       // to set host flags. E.g. we cannot change the defaults using
       // |kDefaultParam| below.
       dest->hostflags = src->hostflags;
     }
   }

   if (should_copy(dest->email != NULL, src->email != NULL, prefer_src)) {
     if (!X509_VERIFY_PARAM_set1_email(dest, src->email, src->emaillen)) {
       return 0;
     }
   }

   if (should_copy(dest->ip != NULL, src->ip != NULL, prefer_src)) {
     if (!X509_VERIFY_PARAM_set1_ip(dest, src->ip, src->iplen)) {
       return 0;
     }
   }

   dest->poison = src->poison;
   return 1;
 }

 int X509_VERIFY_PARAM_inherit(X509_VERIFY_PARAM *dest,
                               const X509_VERIFY_PARAM *src) {
   // Prefer the destination. That is, this function only changes unset
   // parameters in |dest|.
   return x509_verify_param_copy(dest, src, /*prefer_src=*/0);
 }

 int X509_VERIFY_PARAM_set1(X509_VERIFY_PARAM *to,
                            const X509_VERIFY_PARAM *from) {
   // Prefer the source. That is, values in |to| are only preserved if they were
   // unset in |from|.
   return x509_verify_param_copy(to, from, /*prefer_src=*/1);
 }

 static int int_x509_param_set1(char **pdest, size_t *pdestlen, const char *src,
                                size_t srclen) {
   void *tmp;
   if (src == NULL || srclen == 0) {
     // Unlike OpenSSL, we do not allow an empty string to disable previously
     // configured checks.
     return 0;
   }

   tmp = OPENSSL_memdup(src, srclen);
   if (!tmp) {
     return 0;
   }

   if (*pdest) {
     OPENSSL_free(*pdest);
   }
   *pdest = tmp;
   if (pdestlen) {
     *pdestlen = srclen;
   }
   return 1;
 }

 int X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param, unsigned long flags) {
   param->flags |= flags;
   return 1;
 }

 int X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param,
                                   unsigned long flags) {
   param->flags &= ~flags;
   return 1;
 }

 unsigned long X509_VERIFY_PARAM_get_flags(const X509_VERIFY_PARAM *param) {
   return param->flags;
 }

 int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose) {
   if (X509_PURPOSE_get0(purpose) == NULL) {
     OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_PURPOSE);
     return 0;
   }
   param->purpose = purpose;
   return 1;
 }

 int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust) {
   if (!X509_is_valid_trust_id(trust)) {
     OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_TRUST_ID);
     return 0;
   }

   param->trust = trust;
   return 1;
 }

 void X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth) {
   param->depth = depth;
 }

 void X509_VERIFY_PARAM_set_time_posix(X509_VERIFY_PARAM *param, int64_t t) {
   param->check_time = t;
   param->flags |= X509_V_FLAG_USE_CHECK_TIME;
 }

 void X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t) {
   X509_VERIFY_PARAM_set_time_posix(param, t);
 }

 int X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param,
                                   ASN1_OBJECT *policy) {
   if (!param->policies) {
     param->policies = sk_ASN1_OBJECT_new_null();
     if (!param->policies) {
       return 0;
     }
   }
   if (!sk_ASN1_OBJECT_push(param->policies, policy)) {
     return 0;
   }
   return 1;
 }

 int X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,
                                     const STACK_OF(ASN1_OBJECT) *policies) {
   if (!param) {
     return 0;
   }

   sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
   if (!policies) {
     param->policies = NULL;
     return 1;
   }

   param->policies =
       sk_ASN1_OBJECT_deep_copy(policies, OBJ_dup, ASN1_OBJECT_free);
   if (!param->policies) {
     return 0;
   }

   return 1;
 }

 int X509_VERIFY_PARAM_set1_host(X509_VERIFY_PARAM *param, const char *name,
                                 size_t namelen) {
   if (!int_x509_param_set_hosts(param, SET_HOST, name, namelen)) {
     param->poison = 1;
     return 0;
   }
   return 1;
 }

 int X509_VERIFY_PARAM_add1_host(X509_VERIFY_PARAM *param, const char *name,
                                 size_t namelen) {
   if (!int_x509_param_set_hosts(param, ADD_HOST, name, namelen)) {
     param->poison = 1;
     return 0;
   }
   return 1;
 }

 void X509_VERIFY_PARAM_set_hostflags(X509_VERIFY_PARAM *param,
                                      unsigned int flags) {
   param->hostflags = flags;
 }

 int X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM *param, const char *email,
                                  size_t emaillen) {
   if (OPENSSL_memchr(email, '\0', emaillen) != NULL ||
       !int_x509_param_set1(&param->email, &param->emaillen, email, emaillen)) {
     param->poison = 1;
     return 0;
   }

   return 1;
 }

 int X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM *param, const unsigned char *ip,
                               size_t iplen) {
   if ((iplen != 4 && iplen != 16) ||
       !int_x509_param_set1((char **)&param->ip, &param->iplen, (char *)ip,
                            iplen)) {
     param->poison = 1;
     return 0;
   }

   return 1;
 }

 int X509_VERIFY_PARAM_set1_ip_asc(X509_VERIFY_PARAM *param, const char *ipasc) {
   unsigned char ipout[16];
   size_t iplen;

   iplen = (size_t)x509v3_a2i_ipadd(ipout, ipasc);
   if (iplen == 0) {
     return 0;
   }
   return X509_VERIFY_PARAM_set1_ip(param, ipout, iplen);
 }

 int X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param) {
   return param->depth;
 }

 static const X509_VERIFY_PARAM kDefaultParam = {
     .flags = X509_V_FLAG_TRUSTED_FIRST,
     .depth = 100,
 };

 static const X509_VERIFY_PARAM kSMIMESignParam = {
     .purpose = X509_PURPOSE_SMIME_SIGN,
     .trust = X509_TRUST_EMAIL,
     .depth = -1,
 };

 static const X509_VERIFY_PARAM kSSLClientParam = {
     .purpose = X509_PURPOSE_SSL_CLIENT,
     .trust = X509_TRUST_SSL_CLIENT,
     .depth = -1,
 };

 static const X509_VERIFY_PARAM kSSLServerParam = {
     .purpose = X509_PURPOSE_SSL_SERVER,
     .trust = X509_TRUST_SSL_SERVER,
     .depth = -1,
 };

 const X509_VERIFY_PARAM *X509_VERIFY_PARAM_lookup(const char *name) {
   if (strcmp(name, "default") == 0) {
     return &kDefaultParam;
   }
   if (strcmp(name, "pkcs7") == 0) {
     // PKCS#7 and S/MIME signing use the same defaults.
     return &kSMIMESignParam;
   }
   if (strcmp(name, "smime_sign") == 0) {
     return &kSMIMESignParam;
   }
   if (strcmp(name, "ssl_client") == 0) {
     return &kSSLClientParam;
   }
   if (strcmp(name, "ssl_server") == 0) {
     return &kSSLServerParam;
   }
   return NULL;
 }
	/*
	* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
	* 2004.
	*/
	/* ====================================================================
	* Copyright (c) 2004 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
	* licensing@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 <string.h>

	#include <openssl/mem.h>
	#include <openssl/obj.h>
	#include <openssl/stack.h>
	#include <openssl/x509.h>

	#include "../internal.h"
	#include "internal.h"


	// X509_VERIFY_PARAM functions

	#define SET_HOST 0
	#define ADD_HOST 1

	static void str_free(char *s) { OPENSSL_free(s); }

	static int int_x509_param_set_hosts(X509_VERIFY_PARAM *param, int mode,
	const char *name, size_t namelen) {
	char *copy;

	if (name == NULL \|\| namelen == 0) {
	// Unlike OpenSSL, we reject trying to set or add an empty name.
	return 0;
	}

	// Refuse names with embedded NUL bytes.
	// XXX: Do we need to push an error onto the error stack?
	if (name && OPENSSL_memchr(name, '\0', namelen)) {
	return 0;
	}

	if (mode == SET_HOST && param->hosts) {
	sk_OPENSSL_STRING_pop_free(param->hosts, str_free);
	param->hosts = NULL;
	}

	copy = OPENSSL_strndup(name, namelen);
	if (copy == NULL) {
	return 0;
	}

	if (param->hosts == NULL &&
	(param->hosts = sk_OPENSSL_STRING_new_null()) == NULL) {
	OPENSSL_free(copy);
	return 0;
	}

	if (!sk_OPENSSL_STRING_push(param->hosts, copy)) {
	OPENSSL_free(copy);
	if (sk_OPENSSL_STRING_num(param->hosts) == 0) {
	sk_OPENSSL_STRING_free(param->hosts);
	param->hosts = NULL;
	}
	return 0;
	}

	return 1;
	}

	X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void) {
	X509_VERIFY_PARAM *param = OPENSSL_zalloc(sizeof(X509_VERIFY_PARAM));
	if (!param) {
	return NULL;
	}
	param->depth = -1;
	return param;
	}

	void X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param) {
	if (param == NULL) {
	return;
	}
	sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
	sk_OPENSSL_STRING_pop_free(param->hosts, str_free);
	OPENSSL_free(param->email);
	OPENSSL_free(param->ip);
	OPENSSL_free(param);
	}

	static int should_copy(int dest_is_set, int src_is_set, int prefer_src) {
	if (prefer_src) {
	// We prefer the source, so as long as there is a value to copy, copy it.
	return src_is_set;
	}

	// We prefer the destination, so only copy if the destination is unset.
	return src_is_set && !dest_is_set;
	}

	static void copy_int_param(int dest, const int src, int default_val,
	int prefer_src) {
	if (should_copy(dest != default_val, src != default_val, prefer_src)) {
	dest = src;
	}
	}

	// x509_verify_param_copy copies fields from \|src\| to \|dest\|. If both \|src\| and
	// \|dest\| have some field set, \|prefer_src\| determines whether \|src\| or \|dest\|'s
	// version is used.
	static int x509_verify_param_copy(X509_VERIFY_PARAM *dest,
	const X509_VERIFY_PARAM *src,
	int prefer_src) {
	if (src == NULL) {
	return 1;
	}

	copy_int_param(&dest->purpose, &src->purpose, /default_val=/0, prefer_src);
	copy_int_param(&dest->trust, &src->trust, /default_val=/0, prefer_src);
	copy_int_param(&dest->depth, &src->depth, /default_val=/-1, prefer_src);

	// \|check_time\|, unlike all other parameters, does not honor \|prefer_src\|.
	// This means \|X509_VERIFY_PARAM_set1\| will not overwrite it. This behavior
	// comes from OpenSSL but may have been a bug.
	if (!(dest->flags & X509_V_FLAG_USE_CHECK_TIME)) {
	dest->check_time = src->check_time;
	// The source \|X509_V_FLAG_USE_CHECK_TIME\| flag, if set, is copied below.
	}

	dest->flags \|= src->flags;

	if (should_copy(dest->policies != NULL, src->policies != NULL, prefer_src)) {
	if (!X509_VERIFY_PARAM_set1_policies(dest, src->policies)) {
	return 0;
	}
	}

	if (should_copy(dest->hosts != NULL, src->hosts != NULL, prefer_src)) {
	sk_OPENSSL_STRING_pop_free(dest->hosts, str_free);
	dest->hosts = NULL;
	if (src->hosts) {
	dest->hosts =
	sk_OPENSSL_STRING_deep_copy(src->hosts, OPENSSL_strdup, str_free);
	if (dest->hosts == NULL) {
	return 0;
	}
	// Copy the host flags if and only if we're copying the host list. Note
	// this means mechanisms like \|X509_STORE_CTX_set_default\| cannot be used
	// to set host flags. E.g. we cannot change the defaults using
	// \|kDefaultParam\| below.
	dest->hostflags = src->hostflags;
	}
	}

	if (should_copy(dest->email != NULL, src->email != NULL, prefer_src)) {
	if (!X509_VERIFY_PARAM_set1_email(dest, src->email, src->emaillen)) {
	return 0;
	}
	}

	if (should_copy(dest->ip != NULL, src->ip != NULL, prefer_src)) {
	if (!X509_VERIFY_PARAM_set1_ip(dest, src->ip, src->iplen)) {
	return 0;
	}
	}

	dest->poison = src->poison;
	return 1;
	}

	int X509_VERIFY_PARAM_inherit(X509_VERIFY_PARAM *dest,
	const X509_VERIFY_PARAM *src) {
	// Prefer the destination. That is, this function only changes unset
	// parameters in \|dest\|.
	return x509_verify_param_copy(dest, src, /prefer_src=/0);
	}

	int X509_VERIFY_PARAM_set1(X509_VERIFY_PARAM *to,
	const X509_VERIFY_PARAM *from) {
	// Prefer the source. That is, values in \|to\| are only preserved if they were
	// unset in \|from\|.
	return x509_verify_param_copy(to, from, /prefer_src=/1);
	}

	static int int_x509_param_set1(char *pdest, size_t pdestlen, const char *src,
	size_t srclen) {
	void *tmp;
	if (src == NULL \|\| srclen == 0) {
	// Unlike OpenSSL, we do not allow an empty string to disable previously
	// configured checks.
	return 0;
	}

	tmp = OPENSSL_memdup(src, srclen);
	if (!tmp) {
	return 0;
	}

	if (*pdest) {
	OPENSSL_free(*pdest);
	}
	*pdest = tmp;
	if (pdestlen) {
	*pdestlen = srclen;
	}
	return 1;
	}

	int X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param, unsigned long flags) {
	param->flags \|= flags;
	return 1;
	}

	int X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param,
	unsigned long flags) {
	param->flags &= ~flags;
	return 1;
	}

	unsigned long X509_VERIFY_PARAM_get_flags(const X509_VERIFY_PARAM *param) {
	return param->flags;
	}

	int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose) {
	if (X509_PURPOSE_get0(purpose) == NULL) {
	OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_PURPOSE);
	return 0;
	}
	param->purpose = purpose;
	return 1;
	}

	int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust) {
	if (!X509_is_valid_trust_id(trust)) {
	OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_TRUST_ID);
	return 0;
	}

	param->trust = trust;
	return 1;
	}

	void X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth) {
	param->depth = depth;
	}

	void X509_VERIFY_PARAM_set_time_posix(X509_VERIFY_PARAM *param, int64_t t) {
	param->check_time = t;
	param->flags \|= X509_V_FLAG_USE_CHECK_TIME;
	}

	void X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t) {
	X509_VERIFY_PARAM_set_time_posix(param, t);
	}

	int X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param,
	ASN1_OBJECT *policy) {
	if (!param->policies) {
	param->policies = sk_ASN1_OBJECT_new_null();
	if (!param->policies) {
	return 0;
	}
	}
	if (!sk_ASN1_OBJECT_push(param->policies, policy)) {
	return 0;
	}
	return 1;
	}

	int X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,
	const STACK_OF(ASN1_OBJECT) *policies) {
	if (!param) {
	return 0;
	}

	sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
	if (!policies) {
	param->policies = NULL;
	return 1;
	}

	param->policies =
	sk_ASN1_OBJECT_deep_copy(policies, OBJ_dup, ASN1_OBJECT_free);
	if (!param->policies) {
	return 0;
	}

	return 1;
	}

	int X509_VERIFY_PARAM_set1_host(X509_VERIFY_PARAM param, const char name,
	size_t namelen) {
	if (!int_x509_param_set_hosts(param, SET_HOST, name, namelen)) {
	param->poison = 1;
	return 0;
	}
	return 1;
	}

	int X509_VERIFY_PARAM_add1_host(X509_VERIFY_PARAM param, const char name,
	size_t namelen) {
	if (!int_x509_param_set_hosts(param, ADD_HOST, name, namelen)) {
	param->poison = 1;
	return 0;
	}
	return 1;
	}

	void X509_VERIFY_PARAM_set_hostflags(X509_VERIFY_PARAM *param,
	unsigned int flags) {
	param->hostflags = flags;
	}

	int X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM param, const char email,
	size_t emaillen) {
	if (OPENSSL_memchr(email, '\0', emaillen) != NULL \|\|
	!int_x509_param_set1(&param->email, &param->emaillen, email, emaillen)) {
	param->poison = 1;
	return 0;
	}

	return 1;
	}

	int X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM param, const unsigned char ip,
	size_t iplen) {
	if ((iplen != 4 && iplen != 16) \|\|
	!int_x509_param_set1((char *)&param->ip, &param->iplen, (char )ip,
	iplen)) {
	param->poison = 1;
	return 0;
	}

	return 1;
	}

	int X509_VERIFY_PARAM_set1_ip_asc(X509_VERIFY_PARAM param, const char ipasc) {
	unsigned char ipout[16];
	size_t iplen;

	iplen = (size_t)x509v3_a2i_ipadd(ipout, ipasc);
	if (iplen == 0) {
	return 0;
	}
	return X509_VERIFY_PARAM_set1_ip(param, ipout, iplen);
	}

	int X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param) {
	return param->depth;
	}

	static const X509_VERIFY_PARAM kDefaultParam = {
	.flags = X509_V_FLAG_TRUSTED_FIRST,
	.depth = 100,
	};

	static const X509_VERIFY_PARAM kSMIMESignParam = {
	.purpose = X509_PURPOSE_SMIME_SIGN,
	.trust = X509_TRUST_EMAIL,
	.depth = -1,
	};

	static const X509_VERIFY_PARAM kSSLClientParam = {
	.purpose = X509_PURPOSE_SSL_CLIENT,
	.trust = X509_TRUST_SSL_CLIENT,
	.depth = -1,
	};

	static const X509_VERIFY_PARAM kSSLServerParam = {
	.purpose = X509_PURPOSE_SSL_SERVER,
	.trust = X509_TRUST_SSL_SERVER,
	.depth = -1,
	};

	const X509_VERIFY_PARAM X509_VERIFY_PARAM_lookup(const char name) {
	if (strcmp(name, "default") == 0) {
	return &kDefaultParam;
	}
	if (strcmp(name, "pkcs7") == 0) {
	// PKCS#7 and S/MIME signing use the same defaults.
	return &kSMIMESignParam;
	}
	if (strcmp(name, "smime_sign") == 0) {
	return &kSMIMESignParam;
	}
	if (strcmp(name, "ssl_client") == 0) {
	return &kSSLClientParam;
	}
	if (strcmp(name, "ssl_server") == 0) {
	return &kSSLServerParam;
	}
	return NULL;
	}