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 <openssl/x509v3.h>

 #include "../internal.h"
 #include "../x509v3/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); }

 #define string_stack_free(sk) sk_OPENSSL_STRING_pop_free(sk, str_free)

 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) {
     string_stack_free(param->hosts);
     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;
 }

 static void x509_verify_param_zero(X509_VERIFY_PARAM *param) {
   if (!param) {
     return;
   }
   param->name = NULL;
   param->purpose = 0;
   param->trust = 0;
   // param->inh_flags = X509_VP_FLAG_DEFAULT;
   param->inh_flags = 0;
   param->flags = 0;
   param->depth = -1;
   if (param->policies) {
     sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
     param->policies = NULL;
   }
   if (param->hosts) {
     string_stack_free(param->hosts);
     param->hosts = NULL;
   }
   if (param->peername) {
     OPENSSL_free(param->peername);
     param->peername = NULL;
   }
   if (param->email) {
     OPENSSL_free(param->email);
     param->email = NULL;
     param->emaillen = 0;
   }
   if (param->ip) {
     OPENSSL_free(param->ip);
     param->ip = NULL;
     param->iplen = 0;
   }
   param->poison = 0;
 }

 X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void) {
   X509_VERIFY_PARAM *param;
   param = OPENSSL_malloc(sizeof(X509_VERIFY_PARAM));
   if (!param) {
     return NULL;
   }
   OPENSSL_memset(param, 0, sizeof(X509_VERIFY_PARAM));
   x509_verify_param_zero(param);
   return param;
 }

 void X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param) {
   if (param == NULL) {
     return;
   }
   x509_verify_param_zero(param);
   OPENSSL_free(param);
 }

 //-
 // This function determines how parameters are "inherited" from one structure
 // to another. There are several different ways this can happen.
 //
 // 1. If a child structure needs to have its values initialized from a parent
 //    they are simply copied across. For example SSL_CTX copied to SSL.
 // 2. If the structure should take on values only if they are currently unset.
 //    For example the values in an SSL structure will take appropriate value
 //    for SSL servers or clients but only if the application has not set new
 //    ones.
 //
 // The "inh_flags" field determines how this function behaves.
 //
 // Normally any values which are set in the default are not copied from the
 // destination and verify flags are ORed together.
 //
 // If X509_VP_FLAG_DEFAULT is set then anything set in the source is copied
 // to the destination. Effectively the values in "to" become default values
 // which will be used only if nothing new is set in "from".
 //
 // If X509_VP_FLAG_OVERWRITE is set then all value are copied across whether
 // they are set or not. Flags is still Ored though.
 //
 // If X509_VP_FLAG_RESET_FLAGS is set then the flags value is copied instead
 // of ORed.
 //
 // If X509_VP_FLAG_LOCKED is set then no values are copied.
 //
 // If X509_VP_FLAG_ONCE is set then the current inh_flags setting is zeroed
 // after the next call.

 // Macro to test if a field should be copied from src to dest

 #define test_x509_verify_param_copy(field, def) \
   (to_overwrite ||                              \
    ((src->field != (def)) && (to_default || (dest->field == (def)))))

 // Macro to test and copy a field if necessary

 #define x509_verify_param_copy(field, def)     \
   if (test_x509_verify_param_copy(field, def)) \
   dest->field = src->field

 int X509_VERIFY_PARAM_inherit(X509_VERIFY_PARAM *dest,
                               const X509_VERIFY_PARAM *src) {
   unsigned long inh_flags;
   int to_default, to_overwrite;
   if (!src) {
     return 1;
   }
   inh_flags = dest->inh_flags | src->inh_flags;

   if (inh_flags & X509_VP_FLAG_ONCE) {
     dest->inh_flags = 0;
   }

   if (inh_flags & X509_VP_FLAG_LOCKED) {
     return 1;
   }

   if (inh_flags & X509_VP_FLAG_DEFAULT) {
     to_default = 1;
   } else {
     to_default = 0;
   }

   if (inh_flags & X509_VP_FLAG_OVERWRITE) {
     to_overwrite = 1;
   } else {
     to_overwrite = 0;
   }

   x509_verify_param_copy(purpose, 0);
   x509_verify_param_copy(trust, 0);
   x509_verify_param_copy(depth, -1);

   // If overwrite or check time not set, copy across

   if (to_overwrite || !(dest->flags & X509_V_FLAG_USE_CHECK_TIME)) {
     dest->check_time = src->check_time;
     dest->flags &= ~X509_V_FLAG_USE_CHECK_TIME;
     // Don't need to copy flag: that is done below
   }

   if (inh_flags & X509_VP_FLAG_RESET_FLAGS) {
     dest->flags = 0;
   }

   dest->flags |= src->flags;

   if (test_x509_verify_param_copy(policies, NULL)) {
     if (!X509_VERIFY_PARAM_set1_policies(dest, src->policies)) {
       return 0;
     }
   }

   // Copy the host flags if and only if we're copying the host list
   if (test_x509_verify_param_copy(hosts, NULL)) {
     if (dest->hosts) {
       string_stack_free(dest->hosts);
       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;
       }
       dest->hostflags = src->hostflags;
     }
   }

   if (test_x509_verify_param_copy(email, NULL)) {
     if (!X509_VERIFY_PARAM_set1_email(dest, src->email, src->emaillen)) {
       return 0;
     }
   }

   if (test_x509_verify_param_copy(ip, NULL)) {
     if (!X509_VERIFY_PARAM_set1_ip(dest, src->ip, src->iplen)) {
       return 0;
     }
   }

   dest->poison = src->poison;

   return 1;
 }

 int X509_VERIFY_PARAM_set1(X509_VERIFY_PARAM *to,
                            const X509_VERIFY_PARAM *from) {
   unsigned long save_flags = to->inh_flags;
   int ret;
   to->inh_flags |= X509_VP_FLAG_DEFAULT;
   ret = X509_VERIFY_PARAM_inherit(to, from);
   to->inh_flags = save_flags;
   return ret;
 }

 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_set1_name(X509_VERIFY_PARAM *param, const char *name) {
   if (param->name) {
     OPENSSL_free(param->name);
   }
   param->name = OPENSSL_strdup(name);
   if (param->name) {
     return 1;
   }
   return 0;
 }

 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(X509_VERIFY_PARAM *param) {
   return param->flags;
 }

 int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose) {
   return X509_PURPOSE_set(&param->purpose, purpose);
 }

 int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust) {
   return X509_TRUST_set(&param->trust, trust);
 }

 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;
 }

 char *X509_VERIFY_PARAM_get0_peername(X509_VERIFY_PARAM *param) {
   return param->peername;
 }

 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;
 }

 const char *X509_VERIFY_PARAM_get0_name(const X509_VERIFY_PARAM *param) {
   return param->name;
 }

 #define vpm_empty_id NULL, 0U, NULL, NULL, 0, NULL, 0, 0

 // Default verify parameters: these are used for various applications and can
 // be overridden by the user specified table. NB: the 'name' field *must* be
 // in alphabetical order because it will be searched using OBJ_search.

 static const X509_VERIFY_PARAM default_table[] = {
     {(char *)"default",          // X509 default parameters
      0,                          // Check time
      0,                          // internal flags
      X509_V_FLAG_TRUSTED_FIRST,  // flags
      0,                          // purpose
      0,                          // trust
      100,                        // depth
      NULL,                       // policies
      vpm_empty_id},
     {(char *)"pkcs7",          // S/MIME sign parameters
      0,                        // Check time
      0,                        // internal flags
      0,                        // flags
      X509_PURPOSE_SMIME_SIGN,  // purpose
      X509_TRUST_EMAIL,         // trust
      -1,                       // depth
      NULL,                     // policies
      vpm_empty_id},
     {(char *)"smime_sign",     // S/MIME sign parameters
      0,                        // Check time
      0,                        // internal flags
      0,                        // flags
      X509_PURPOSE_SMIME_SIGN,  // purpose
      X509_TRUST_EMAIL,         // trust
      -1,                       // depth
      NULL,                     // policies
      vpm_empty_id},
     {(char *)"ssl_client",     // SSL/TLS client parameters
      0,                        // Check time
      0,                        // internal flags
      0,                        // flags
      X509_PURPOSE_SSL_CLIENT,  // purpose
      X509_TRUST_SSL_CLIENT,    // trust
      -1,                       // depth
      NULL,                     // policies
      vpm_empty_id},
     {(char *)"ssl_server",     // SSL/TLS server parameters
      0,                        // Check time
      0,                        // internal flags
      0,                        // flags
      X509_PURPOSE_SSL_SERVER,  // purpose
      X509_TRUST_SSL_SERVER,    // trust
      -1,                       // depth
      NULL,                     // policies
      vpm_empty_id}};

 const X509_VERIFY_PARAM *X509_VERIFY_PARAM_lookup(const char *name) {
   for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(default_table); i++) {
     if (strcmp(default_table[i].name, name) == 0) {
       return &default_table[i];
     }
   }
   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 <openssl/x509v3.h>

	#include "../internal.h"
	#include "../x509v3/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); }

	#define string_stack_free(sk) sk_OPENSSL_STRING_pop_free(sk, str_free)

	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) {
	string_stack_free(param->hosts);
	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;
	}

	static void x509_verify_param_zero(X509_VERIFY_PARAM *param) {
	if (!param) {
	return;
	}
	param->name = NULL;
	param->purpose = 0;
	param->trust = 0;
	// param->inh_flags = X509_VP_FLAG_DEFAULT;
	param->inh_flags = 0;
	param->flags = 0;
	param->depth = -1;
	if (param->policies) {
	sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);
	param->policies = NULL;
	}
	if (param->hosts) {
	string_stack_free(param->hosts);
	param->hosts = NULL;
	}
	if (param->peername) {
	OPENSSL_free(param->peername);
	param->peername = NULL;
	}
	if (param->email) {
	OPENSSL_free(param->email);
	param->email = NULL;
	param->emaillen = 0;
	}
	if (param->ip) {
	OPENSSL_free(param->ip);
	param->ip = NULL;
	param->iplen = 0;
	}
	param->poison = 0;
	}

	X509_VERIFY_PARAM *X509_VERIFY_PARAM_new(void) {
	X509_VERIFY_PARAM *param;
	param = OPENSSL_malloc(sizeof(X509_VERIFY_PARAM));
	if (!param) {
	return NULL;
	}
	OPENSSL_memset(param, 0, sizeof(X509_VERIFY_PARAM));
	x509_verify_param_zero(param);
	return param;
	}

	void X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param) {
	if (param == NULL) {
	return;
	}
	x509_verify_param_zero(param);
	OPENSSL_free(param);
	}

	//-
	// This function determines how parameters are "inherited" from one structure
	// to another. There are several different ways this can happen.
	//
	// 1. If a child structure needs to have its values initialized from a parent
	// they are simply copied across. For example SSL_CTX copied to SSL.
	// 2. If the structure should take on values only if they are currently unset.
	// For example the values in an SSL structure will take appropriate value
	// for SSL servers or clients but only if the application has not set new
	// ones.
	//
	// The "inh_flags" field determines how this function behaves.
	//
	// Normally any values which are set in the default are not copied from the
	// destination and verify flags are ORed together.
	//
	// If X509_VP_FLAG_DEFAULT is set then anything set in the source is copied
	// to the destination. Effectively the values in "to" become default values
	// which will be used only if nothing new is set in "from".
	//
	// If X509_VP_FLAG_OVERWRITE is set then all value are copied across whether
	// they are set or not. Flags is still Ored though.
	//
	// If X509_VP_FLAG_RESET_FLAGS is set then the flags value is copied instead
	// of ORed.
	//
	// If X509_VP_FLAG_LOCKED is set then no values are copied.
	//
	// If X509_VP_FLAG_ONCE is set then the current inh_flags setting is zeroed
	// after the next call.

	// Macro to test if a field should be copied from src to dest

	#define test_x509_verify_param_copy(field, def) \
	(to_overwrite \|\| \
	((src->field != (def)) && (to_default \|\| (dest->field == (def)))))

	// Macro to test and copy a field if necessary

	#define x509_verify_param_copy(field, def) \
	if (test_x509_verify_param_copy(field, def)) \
	dest->field = src->field

	int X509_VERIFY_PARAM_inherit(X509_VERIFY_PARAM *dest,
	const X509_VERIFY_PARAM *src) {
	unsigned long inh_flags;
	int to_default, to_overwrite;
	if (!src) {
	return 1;
	}
	inh_flags = dest->inh_flags \| src->inh_flags;

	if (inh_flags & X509_VP_FLAG_ONCE) {
	dest->inh_flags = 0;
	}

	if (inh_flags & X509_VP_FLAG_LOCKED) {
	return 1;
	}

	if (inh_flags & X509_VP_FLAG_DEFAULT) {
	to_default = 1;
	} else {
	to_default = 0;
	}

	if (inh_flags & X509_VP_FLAG_OVERWRITE) {
	to_overwrite = 1;
	} else {
	to_overwrite = 0;
	}

	x509_verify_param_copy(purpose, 0);
	x509_verify_param_copy(trust, 0);
	x509_verify_param_copy(depth, -1);

	// If overwrite or check time not set, copy across

	if (to_overwrite \|\| !(dest->flags & X509_V_FLAG_USE_CHECK_TIME)) {
	dest->check_time = src->check_time;
	dest->flags &= ~X509_V_FLAG_USE_CHECK_TIME;
	// Don't need to copy flag: that is done below
	}

	if (inh_flags & X509_VP_FLAG_RESET_FLAGS) {
	dest->flags = 0;
	}

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

	if (test_x509_verify_param_copy(policies, NULL)) {
	if (!X509_VERIFY_PARAM_set1_policies(dest, src->policies)) {
	return 0;
	}
	}

	// Copy the host flags if and only if we're copying the host list
	if (test_x509_verify_param_copy(hosts, NULL)) {
	if (dest->hosts) {
	string_stack_free(dest->hosts);
	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;
	}
	dest->hostflags = src->hostflags;
	}
	}

	if (test_x509_verify_param_copy(email, NULL)) {
	if (!X509_VERIFY_PARAM_set1_email(dest, src->email, src->emaillen)) {
	return 0;
	}
	}

	if (test_x509_verify_param_copy(ip, NULL)) {
	if (!X509_VERIFY_PARAM_set1_ip(dest, src->ip, src->iplen)) {
	return 0;
	}
	}

	dest->poison = src->poison;

	return 1;
	}

	int X509_VERIFY_PARAM_set1(X509_VERIFY_PARAM *to,
	const X509_VERIFY_PARAM *from) {
	unsigned long save_flags = to->inh_flags;
	int ret;
	to->inh_flags \|= X509_VP_FLAG_DEFAULT;
	ret = X509_VERIFY_PARAM_inherit(to, from);
	to->inh_flags = save_flags;
	return ret;
	}

	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_set1_name(X509_VERIFY_PARAM param, const char name) {
	if (param->name) {
	OPENSSL_free(param->name);
	}
	param->name = OPENSSL_strdup(name);
	if (param->name) {
	return 1;
	}
	return 0;
	}

	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(X509_VERIFY_PARAM *param) {
	return param->flags;
	}

	int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose) {
	return X509_PURPOSE_set(&param->purpose, purpose);
	}

	int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust) {
	return X509_TRUST_set(&param->trust, trust);
	}

	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;
	}

	char X509_VERIFY_PARAM_get0_peername(X509_VERIFY_PARAM param) {
	return param->peername;
	}

	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;
	}

	const char X509_VERIFY_PARAM_get0_name(const X509_VERIFY_PARAM param) {
	return param->name;
	}

	#define vpm_empty_id NULL, 0U, NULL, NULL, 0, NULL, 0, 0

	// Default verify parameters: these are used for various applications and can
	// be overridden by the user specified table. NB: the 'name' field must be
	// in alphabetical order because it will be searched using OBJ_search.

	static const X509_VERIFY_PARAM default_table[] = {
	{(char *)"default", // X509 default parameters
	0, // Check time
	0, // internal flags
	X509_V_FLAG_TRUSTED_FIRST, // flags
	0, // purpose
	0, // trust
	100, // depth
	NULL, // policies
	vpm_empty_id},
	{(char *)"pkcs7", // S/MIME sign parameters
	0, // Check time
	0, // internal flags
	0, // flags
	X509_PURPOSE_SMIME_SIGN, // purpose
	X509_TRUST_EMAIL, // trust
	-1, // depth
	NULL, // policies
	vpm_empty_id},
	{(char *)"smime_sign", // S/MIME sign parameters
	0, // Check time
	0, // internal flags
	0, // flags
	X509_PURPOSE_SMIME_SIGN, // purpose
	X509_TRUST_EMAIL, // trust
	-1, // depth
	NULL, // policies
	vpm_empty_id},
	{(char *)"ssl_client", // SSL/TLS client parameters
	0, // Check time
	0, // internal flags
	0, // flags
	X509_PURPOSE_SSL_CLIENT, // purpose
	X509_TRUST_SSL_CLIENT, // trust
	-1, // depth
	NULL, // policies
	vpm_empty_id},
	{(char *)"ssl_server", // SSL/TLS server parameters
	0, // Check time
	0, // internal flags
	0, // flags
	X509_PURPOSE_SSL_SERVER, // purpose
	X509_TRUST_SSL_SERVER, // trust
	-1, // depth
	NULL, // policies
	vpm_empty_id}};

	const X509_VERIFY_PARAM X509_VERIFY_PARAM_lookup(const char name) {
	for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(default_table); i++) {
	if (strcmp(default_table[i].name, name) == 0) {
	return &default_table[i];
	}
	}
	return NULL;
	}