crypto/x509v3/v3_ncons.c - platform/external/openssl - Git at Google

 /* v3_ncons.c */
 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project.
  */
 /* ====================================================================
  * Copyright (c) 2003 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 <stdio.h>
 #include "cryptlib.h"
 #include <openssl/asn1t.h>
 #include <openssl/conf.h>
 #include <openssl/x509v3.h>

 static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
 				  X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval);
 static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
 				void *a, BIO *bp, int ind);
 static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
 				   STACK_OF(GENERAL_SUBTREE) *trees,
 				   BIO *bp, int ind, char *name);
 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip);

 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc);
 static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen);
 static int nc_dn(X509_NAME *sub, X509_NAME *nm);
 static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns);
 static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml);
 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base);

 const X509V3_EXT_METHOD v3_name_constraints = {
 	NID_name_constraints, 0,
 	ASN1_ITEM_ref(NAME_CONSTRAINTS),
 	0,0,0,0,
 	0,0,
 	0, v2i_NAME_CONSTRAINTS,
 	i2r_NAME_CONSTRAINTS,0,
 	NULL
 };

 ASN1_SEQUENCE(GENERAL_SUBTREE) = {
 	ASN1_SIMPLE(GENERAL_SUBTREE, base, GENERAL_NAME),
 	ASN1_IMP_OPT(GENERAL_SUBTREE, minimum, ASN1_INTEGER, 0),
 	ASN1_IMP_OPT(GENERAL_SUBTREE, maximum, ASN1_INTEGER, 1)
 } ASN1_SEQUENCE_END(GENERAL_SUBTREE)

 ASN1_SEQUENCE(NAME_CONSTRAINTS) = {
 	ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, permittedSubtrees,
 							GENERAL_SUBTREE, 0),
 	ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, excludedSubtrees,
 							GENERAL_SUBTREE, 1),
 } ASN1_SEQUENCE_END(NAME_CONSTRAINTS)


 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE)
 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS)

 static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
 				  X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
 	{
 	int i;
 	CONF_VALUE tval, *val;
 	STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
 	NAME_CONSTRAINTS *ncons = NULL;
 	GENERAL_SUBTREE *sub = NULL;
 	ncons = NAME_CONSTRAINTS_new();
 	if (!ncons)
 		goto memerr;
 	for(i = 0; i < sk_CONF_VALUE_num(nval); i++)
 		{
 		val = sk_CONF_VALUE_value(nval, i);
 		if (!strncmp(val->name, "permitted", 9) && val->name[9])
 			{
 			ptree = &ncons->permittedSubtrees;
 			tval.name = val->name + 10;
 			}
 		else if (!strncmp(val->name, "excluded", 8) && val->name[8])
 			{
 			ptree = &ncons->excludedSubtrees;
 			tval.name = val->name + 9;
 			}
 		else
 			{
 			X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, X509V3_R_INVALID_SYNTAX);
 			goto err;
 			}
 		tval.value = val->value;
 		sub = GENERAL_SUBTREE_new();
 		if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
 			goto err;
 		if (!*ptree)
 			*ptree = sk_GENERAL_SUBTREE_new_null();
 		if (!*ptree || !sk_GENERAL_SUBTREE_push(*ptree, sub))
 			goto memerr;
 		sub = NULL;
 		}

 	return ncons;

 	memerr:
 	X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
 	err:
 	if (ncons)
 		NAME_CONSTRAINTS_free(ncons);
 	if (sub)
 		GENERAL_SUBTREE_free(sub);

 	return NULL;
 	}


 static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
 				BIO *bp, int ind)
 	{
 	NAME_CONSTRAINTS *ncons = a;
 	do_i2r_name_constraints(method, ncons->permittedSubtrees,
 					bp, ind, "Permitted");
 	do_i2r_name_constraints(method, ncons->excludedSubtrees,
 					bp, ind, "Excluded");
 	return 1;
 	}

 static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
 				   STACK_OF(GENERAL_SUBTREE) *trees,
 				   BIO *bp, int ind, char *name)
 	{
 	GENERAL_SUBTREE *tree;
 	int i;
 	if (sk_GENERAL_SUBTREE_num(trees) > 0)
 		BIO_printf(bp, "%*s%s:\n", ind, "", name);
 	for(i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++)
 		{
 		tree = sk_GENERAL_SUBTREE_value(trees, i);
 		BIO_printf(bp, "%*s", ind + 2, "");
 		if (tree->base->type == GEN_IPADD)
 			print_nc_ipadd(bp, tree->base->d.ip);
 		else
 			GENERAL_NAME_print(bp, tree->base);
 		BIO_puts(bp, "\n");
 		}
 	return 1;
 	}

 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
 	{
 	int i, len;
 	unsigned char *p;
 	p = ip->data;
 	len = ip->length;
 	BIO_puts(bp, "IP:");
 	if(len == 8)
 		{
 		BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
 				p[0], p[1], p[2], p[3],
 				p[4], p[5], p[6], p[7]);
 		}
 	else if(len == 32)
 		{
 		for (i = 0; i < 16; i++)
 			{
 			BIO_printf(bp, "%X", p[0] << 8 | p[1]);
 			p += 2;
 			if (i == 7)
 				BIO_puts(bp, "/");
 			else if (i != 15)
 				BIO_puts(bp, ":");
 			}
 		}
 	else
 		BIO_printf(bp, "IP Address:<invalid>");
 	return 1;
 	}

 /* Check a certificate conforms to a specified set of constraints.
  * Return values:
  *  X509_V_OK: All constraints obeyed.
  *  X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
  *  X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
  *  X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
  *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE:  Unsupported constraint type.
  *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
  *  X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name

  */

 int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
 	{
 	int r, i;
 	X509_NAME *nm;

 	nm = X509_get_subject_name(x);

 	if (X509_NAME_entry_count(nm) > 0)
 		{
 		GENERAL_NAME gntmp;
 		gntmp.type = GEN_DIRNAME;
 		gntmp.d.directoryName = nm;

 		r = nc_match(&gntmp, nc);

 		if (r != X509_V_OK)
 			return r;

 		gntmp.type = GEN_EMAIL;


 		/* Process any email address attributes in subject name */

 		for (i = -1;;)
 			{
 			X509_NAME_ENTRY *ne;
 			i = X509_NAME_get_index_by_NID(nm,
 						       NID_pkcs9_emailAddress,
 						       i);
 			if (i == -1)
 				break;
 			ne = X509_NAME_get_entry(nm, i);
 			gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
 			if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
 				return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;

 			r = nc_match(&gntmp, nc);

 			if (r != X509_V_OK)
 				return r;
 			}

 		}

 	for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++)
 		{
 		GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
 		r = nc_match(gen, nc);
 		if (r != X509_V_OK)
 			return r;
 		}

 	return X509_V_OK;

 	}

 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
 	{
 	GENERAL_SUBTREE *sub;
 	int i, r, match = 0;

 	/* Permitted subtrees: if any subtrees exist of matching the type
 	 * at least one subtree must match.
 	 */

 	for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++)
 		{
 		sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
 		if (gen->type != sub->base->type)
 			continue;
 		if (sub->minimum || sub->maximum)
 			return X509_V_ERR_SUBTREE_MINMAX;
 		/* If we already have a match don't bother trying any more */
 		if (match == 2)
 			continue;
 		if (match == 0)
 			match = 1;
 		r = nc_match_single(gen, sub->base);
 		if (r == X509_V_OK)
 			match = 2;
 		else if (r != X509_V_ERR_PERMITTED_VIOLATION)
 			return r;
 		}

 	if (match == 1)
 		return X509_V_ERR_PERMITTED_VIOLATION;

 	/* Excluded subtrees: must not match any of these */

 	for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++)
 		{
 		sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
 		if (gen->type != sub->base->type)
 			continue;
 		if (sub->minimum || sub->maximum)
 			return X509_V_ERR_SUBTREE_MINMAX;

 		r = nc_match_single(gen, sub->base);
 		if (r == X509_V_OK)
 			return X509_V_ERR_EXCLUDED_VIOLATION;
 		else if (r != X509_V_ERR_PERMITTED_VIOLATION)
 			return r;

 		}

 	return X509_V_OK;

 	}

 static int nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
 	{
 	switch(base->type)
 		{
 		case GEN_DIRNAME:
 		return nc_dn(gen->d.directoryName, base->d.directoryName);

 		case GEN_DNS:
 		return nc_dns(gen->d.dNSName, base->d.dNSName);

 		case GEN_EMAIL:
 		return nc_email(gen->d.rfc822Name, base->d.rfc822Name);

 		case GEN_URI:
 		return nc_uri(gen->d.uniformResourceIdentifier,
 					base->d.uniformResourceIdentifier);

 		default:
 		return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
 		}

 	}

 /* directoryName name constraint matching.
  * The canonical encoding of X509_NAME makes this comparison easy. It is
  * matched if the subtree is a subset of the name.
  */

 static int nc_dn(X509_NAME *nm, X509_NAME *base)
 	{
 	/* Ensure canonical encodings are up to date.  */
 	if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
 		return X509_V_ERR_OUT_OF_MEM;
 	if (base->modified && i2d_X509_NAME(base, NULL) < 0)
 		return X509_V_ERR_OUT_OF_MEM;
 	if (base->canon_enclen > nm->canon_enclen)
 		return X509_V_ERR_PERMITTED_VIOLATION;
 	if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
 		return X509_V_ERR_PERMITTED_VIOLATION;
 	return X509_V_OK;
 	}

 static int nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
 	{
 	char *baseptr = (char *)base->data;
 	char *dnsptr = (char *)dns->data;
 	/* Empty matches everything */
 	if (!*baseptr)
 		return X509_V_OK;
 	/* Otherwise can add zero or more components on the left so
 	 * compare RHS and if dns is longer and expect '.' as preceding
 	 * character.
 	 */
 	if (dns->length > base->length)
 		{
 		dnsptr += dns->length - base->length;
 		if (dnsptr[-1] != '.')
 			return X509_V_ERR_PERMITTED_VIOLATION;
 		}

 	if (strcasecmp(baseptr, dnsptr))
 			return X509_V_ERR_PERMITTED_VIOLATION;

 	return X509_V_OK;

 	}

 static int nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
 	{
 	const char *baseptr = (char *)base->data;
 	const char *emlptr = (char *)eml->data;

 	const char *baseat = strchr(baseptr, '@');
 	const char *emlat = strchr(emlptr, '@');
 	if (!emlat)
 		return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
 	/* Special case: inital '.' is RHS match */
 	if (!baseat && (*baseptr == '.'))
 		{
 		if (eml->length > base->length)
 			{
 			emlptr += eml->length - base->length;
 			if (!strcasecmp(baseptr, emlptr))
 				return X509_V_OK;
 			}
 		return X509_V_ERR_PERMITTED_VIOLATION;
 		}

 	/* If we have anything before '@' match local part */

 	if (baseat)
 		{
 		if (baseat != baseptr)
 			{
 			if ((baseat - baseptr) != (emlat - emlptr))
 				return X509_V_ERR_PERMITTED_VIOLATION;
 			/* Case sensitive match of local part */
 			if (strncmp(baseptr, emlptr, emlat - emlptr))
 				return X509_V_ERR_PERMITTED_VIOLATION;
 			}
 		/* Position base after '@' */
 		baseptr = baseat + 1;
 		}
 	emlptr = emlat + 1;
 	/* Just have hostname left to match: case insensitive */
 	if (strcasecmp(baseptr, emlptr))
 		return X509_V_ERR_PERMITTED_VIOLATION;

 	return X509_V_OK;

 	}

 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
 	{
 	const char *baseptr = (char *)base->data;
 	const char *hostptr = (char *)uri->data;
 	const char *p = strchr(hostptr, ':');
 	int hostlen;
 	/* Check for foo:// and skip past it */
 	if (!p || (p[1] != '/') || (p[2] != '/'))
 		return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
 	hostptr = p + 3;

 	/* Determine length of hostname part of URI */

 	/* Look for a port indicator as end of hostname first */

 	p = strchr(hostptr, ':');
 	/* Otherwise look for trailing slash */
 	if (!p)
 		p = strchr(hostptr, '/');

 	if (!p)
 		hostlen = strlen(hostptr);
 	else
 		hostlen = p - hostptr;

 	if (hostlen == 0)
 		return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;

 	/* Special case: inital '.' is RHS match */
 	if (*baseptr == '.')
 		{
 		if (hostlen > base->length)
 			{
 			p = hostptr + hostlen - base->length;
 			if (!strncasecmp(p, baseptr, base->length))
 				return X509_V_OK;
 			}
 		return X509_V_ERR_PERMITTED_VIOLATION;
 		}

 	if ((base->length != (int)hostlen) || strncasecmp(hostptr, baseptr, hostlen))
 		return X509_V_ERR_PERMITTED_VIOLATION;

 	return X509_V_OK;

 	}
	/* v3_ncons.c */
	/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
	* project.
	*/
	/* ====================================================================
	* Copyright (c) 2003 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 <stdio.h>
	#include "cryptlib.h"
	#include <openssl/asn1t.h>
	#include <openssl/conf.h>
	#include <openssl/x509v3.h>

	static void v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD method,
	X509V3_CTX ctx, STACK_OF(CONF_VALUE) nval);
	static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
	void a, BIO bp, int ind);
	static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
	STACK_OF(GENERAL_SUBTREE) *trees,
	BIO bp, int ind, char name);
	static int print_nc_ipadd(BIO bp, ASN1_OCTET_STRING ip);

	static int nc_match(GENERAL_NAME gen, NAME_CONSTRAINTS nc);
	static int nc_match_single(GENERAL_NAME sub, GENERAL_NAME gen);
	static int nc_dn(X509_NAME sub, X509_NAME nm);
	static int nc_dns(ASN1_IA5STRING sub, ASN1_IA5STRING dns);
	static int nc_email(ASN1_IA5STRING sub, ASN1_IA5STRING eml);
	static int nc_uri(ASN1_IA5STRING uri, ASN1_IA5STRING base);

	const X509V3_EXT_METHOD v3_name_constraints = {
	NID_name_constraints, 0,
	ASN1_ITEM_ref(NAME_CONSTRAINTS),
	0,0,0,0,
	0,0,
	0, v2i_NAME_CONSTRAINTS,
	i2r_NAME_CONSTRAINTS,0,
	NULL
	};

	ASN1_SEQUENCE(GENERAL_SUBTREE) = {
	ASN1_SIMPLE(GENERAL_SUBTREE, base, GENERAL_NAME),
	ASN1_IMP_OPT(GENERAL_SUBTREE, minimum, ASN1_INTEGER, 0),
	ASN1_IMP_OPT(GENERAL_SUBTREE, maximum, ASN1_INTEGER, 1)
	} ASN1_SEQUENCE_END(GENERAL_SUBTREE)

	ASN1_SEQUENCE(NAME_CONSTRAINTS) = {
	ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, permittedSubtrees,
	GENERAL_SUBTREE, 0),
	ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, excludedSubtrees,
	GENERAL_SUBTREE, 1),
	} ASN1_SEQUENCE_END(NAME_CONSTRAINTS)


	IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE)
	IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS)

	static void v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD method,
	X509V3_CTX ctx, STACK_OF(CONF_VALUE) nval)
	{
	int i;
	CONF_VALUE tval, *val;
	STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
	NAME_CONSTRAINTS *ncons = NULL;
	GENERAL_SUBTREE *sub = NULL;
	ncons = NAME_CONSTRAINTS_new();
	if (!ncons)
	goto memerr;
	for(i = 0; i < sk_CONF_VALUE_num(nval); i++)
	{
	val = sk_CONF_VALUE_value(nval, i);
	if (!strncmp(val->name, "permitted", 9) && val->name[9])
	{
	ptree = &ncons->permittedSubtrees;
	tval.name = val->name + 10;
	}
	else if (!strncmp(val->name, "excluded", 8) && val->name[8])
	{
	ptree = &ncons->excludedSubtrees;
	tval.name = val->name + 9;
	}
	else
	{
	X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, X509V3_R_INVALID_SYNTAX);
	goto err;
	}
	tval.value = val->value;
	sub = GENERAL_SUBTREE_new();
	if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
	goto err;
	if (!*ptree)
	*ptree = sk_GENERAL_SUBTREE_new_null();
	if (!ptree \|\| !sk_GENERAL_SUBTREE_push(ptree, sub))
	goto memerr;
	sub = NULL;
	}

	return ncons;

	memerr:
	X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
	err:
	if (ncons)
	NAME_CONSTRAINTS_free(ncons);
	if (sub)
	GENERAL_SUBTREE_free(sub);

	return NULL;
	}




	static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD method, void a,
	BIO *bp, int ind)
	{
	NAME_CONSTRAINTS *ncons = a;
	do_i2r_name_constraints(method, ncons->permittedSubtrees,
	bp, ind, "Permitted");
	do_i2r_name_constraints(method, ncons->excludedSubtrees,
	bp, ind, "Excluded");
	return 1;
	}

	static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
	STACK_OF(GENERAL_SUBTREE) *trees,
	BIO bp, int ind, char name)
	{
	GENERAL_SUBTREE *tree;
	int i;
	if (sk_GENERAL_SUBTREE_num(trees) > 0)
	BIO_printf(bp, "%*s%s:\n", ind, "", name);
	for(i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++)
	{
	tree = sk_GENERAL_SUBTREE_value(trees, i);
	BIO_printf(bp, "%*s", ind + 2, "");
	if (tree->base->type == GEN_IPADD)
	print_nc_ipadd(bp, tree->base->d.ip);
	else
	GENERAL_NAME_print(bp, tree->base);
	BIO_puts(bp, "\n");
	}
	return 1;
	}

	static int print_nc_ipadd(BIO bp, ASN1_OCTET_STRING ip)
	{
	int i, len;
	unsigned char *p;
	p = ip->data;
	len = ip->length;
	BIO_puts(bp, "IP:");
	if(len == 8)
	{
	BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
	p[0], p[1], p[2], p[3],
	p[4], p[5], p[6], p[7]);
	}
	else if(len == 32)
	{
	for (i = 0; i < 16; i++)
	{
	BIO_printf(bp, "%X", p[0] << 8 \| p[1]);
	p += 2;
	if (i == 7)
	BIO_puts(bp, "/");
	else if (i != 15)
	BIO_puts(bp, ":");
	}
	}
	else
	BIO_printf(bp, "IP Address:<invalid>");
	return 1;
	}

	/* Check a certificate conforms to a specified set of constraints.
	* Return values:
	* X509_V_OK: All constraints obeyed.
	* X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
	* X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
	* X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
	* X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: Unsupported constraint type.
	* X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
	* X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name

	*/

	int NAME_CONSTRAINTS_check(X509 x, NAME_CONSTRAINTS nc)
	{
	int r, i;
	X509_NAME *nm;

	nm = X509_get_subject_name(x);

	if (X509_NAME_entry_count(nm) > 0)
	{
	GENERAL_NAME gntmp;
	gntmp.type = GEN_DIRNAME;
	gntmp.d.directoryName = nm;

	r = nc_match(&gntmp, nc);

	if (r != X509_V_OK)
	return r;

	gntmp.type = GEN_EMAIL;


	/* Process any email address attributes in subject name */

	for (i = -1;;)
	{
	X509_NAME_ENTRY *ne;
	i = X509_NAME_get_index_by_NID(nm,
	NID_pkcs9_emailAddress,
	i);
	if (i == -1)
	break;
	ne = X509_NAME_get_entry(nm, i);
	gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
	if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
	return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;

	r = nc_match(&gntmp, nc);

	if (r != X509_V_OK)
	return r;
	}

	}

	for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++)
	{
	GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
	r = nc_match(gen, nc);
	if (r != X509_V_OK)
	return r;
	}

	return X509_V_OK;

	}

	static int nc_match(GENERAL_NAME gen, NAME_CONSTRAINTS nc)
	{
	GENERAL_SUBTREE *sub;
	int i, r, match = 0;

	/* Permitted subtrees: if any subtrees exist of matching the type
	* at least one subtree must match.
	*/

	for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++)
	{
	sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
	if (gen->type != sub->base->type)
	continue;
	if (sub->minimum \|\| sub->maximum)
	return X509_V_ERR_SUBTREE_MINMAX;
	/* If we already have a match don't bother trying any more */
	if (match == 2)
	continue;
	if (match == 0)
	match = 1;
	r = nc_match_single(gen, sub->base);
	if (r == X509_V_OK)
	match = 2;
	else if (r != X509_V_ERR_PERMITTED_VIOLATION)
	return r;
	}

	if (match == 1)
	return X509_V_ERR_PERMITTED_VIOLATION;

	/* Excluded subtrees: must not match any of these */

	for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++)
	{
	sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
	if (gen->type != sub->base->type)
	continue;
	if (sub->minimum \|\| sub->maximum)
	return X509_V_ERR_SUBTREE_MINMAX;

	r = nc_match_single(gen, sub->base);
	if (r == X509_V_OK)
	return X509_V_ERR_EXCLUDED_VIOLATION;
	else if (r != X509_V_ERR_PERMITTED_VIOLATION)
	return r;

	}

	return X509_V_OK;

	}

	static int nc_match_single(GENERAL_NAME gen, GENERAL_NAME base)
	{
	switch(base->type)
	{
	case GEN_DIRNAME:
	return nc_dn(gen->d.directoryName, base->d.directoryName);

	case GEN_DNS:
	return nc_dns(gen->d.dNSName, base->d.dNSName);

	case GEN_EMAIL:
	return nc_email(gen->d.rfc822Name, base->d.rfc822Name);

	case GEN_URI:
	return nc_uri(gen->d.uniformResourceIdentifier,
	base->d.uniformResourceIdentifier);

	default:
	return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
	}

	}

	/* directoryName name constraint matching.
	* The canonical encoding of X509_NAME makes this comparison easy. It is
	* matched if the subtree is a subset of the name.
	*/

	static int nc_dn(X509_NAME nm, X509_NAME base)
	{
	/* Ensure canonical encodings are up to date. */
	if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
	return X509_V_ERR_OUT_OF_MEM;
	if (base->modified && i2d_X509_NAME(base, NULL) < 0)
	return X509_V_ERR_OUT_OF_MEM;
	if (base->canon_enclen > nm->canon_enclen)
	return X509_V_ERR_PERMITTED_VIOLATION;
	if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
	return X509_V_ERR_PERMITTED_VIOLATION;
	return X509_V_OK;
	}

	static int nc_dns(ASN1_IA5STRING dns, ASN1_IA5STRING base)
	{
	char baseptr = (char )base->data;
	char dnsptr = (char )dns->data;
	/* Empty matches everything */
	if (!*baseptr)
	return X509_V_OK;
	/* Otherwise can add zero or more components on the left so
	* compare RHS and if dns is longer and expect '.' as preceding
	* character.
	*/
	if (dns->length > base->length)
	{
	dnsptr += dns->length - base->length;
	if (dnsptr[-1] != '.')
	return X509_V_ERR_PERMITTED_VIOLATION;
	}

	if (strcasecmp(baseptr, dnsptr))
	return X509_V_ERR_PERMITTED_VIOLATION;

	return X509_V_OK;

	}

	static int nc_email(ASN1_IA5STRING eml, ASN1_IA5STRING base)
	{
	const char baseptr = (char )base->data;
	const char emlptr = (char )eml->data;

	const char *baseat = strchr(baseptr, '@');
	const char *emlat = strchr(emlptr, '@');
	if (!emlat)
	return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
	/* Special case: inital '.' is RHS match */
	if (!baseat && (*baseptr == '.'))
	{
	if (eml->length > base->length)
	{
	emlptr += eml->length - base->length;
	if (!strcasecmp(baseptr, emlptr))
	return X509_V_OK;
	}
	return X509_V_ERR_PERMITTED_VIOLATION;
	}

	/* If we have anything before '@' match local part */

	if (baseat)
	{
	if (baseat != baseptr)
	{
	if ((baseat - baseptr) != (emlat - emlptr))
	return X509_V_ERR_PERMITTED_VIOLATION;
	/* Case sensitive match of local part */
	if (strncmp(baseptr, emlptr, emlat - emlptr))
	return X509_V_ERR_PERMITTED_VIOLATION;
	}
	/* Position base after '@' */
	baseptr = baseat + 1;
	}
	emlptr = emlat + 1;
	/* Just have hostname left to match: case insensitive */
	if (strcasecmp(baseptr, emlptr))
	return X509_V_ERR_PERMITTED_VIOLATION;

	return X509_V_OK;

	}

	static int nc_uri(ASN1_IA5STRING uri, ASN1_IA5STRING base)
	{
	const char baseptr = (char )base->data;
	const char hostptr = (char )uri->data;
	const char *p = strchr(hostptr, ':');
	int hostlen;
	/* Check for foo:// and skip past it */
	if (!p \|\| (p[1] != '/') \|\| (p[2] != '/'))
	return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
	hostptr = p + 3;

	/* Determine length of hostname part of URI */

	/* Look for a port indicator as end of hostname first */

	p = strchr(hostptr, ':');
	/* Otherwise look for trailing slash */
	if (!p)
	p = strchr(hostptr, '/');

	if (!p)
	hostlen = strlen(hostptr);
	else
	hostlen = p - hostptr;

	if (hostlen == 0)
	return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;

	/* Special case: inital '.' is RHS match */
	if (*baseptr == '.')
	{
	if (hostlen > base->length)
	{
	p = hostptr + hostlen - base->length;
	if (!strncasecmp(p, baseptr, base->length))
	return X509_V_OK;
	}
	return X509_V_ERR_PERMITTED_VIOLATION;
	}

	if ((base->length != (int)hostlen) \|\| strncasecmp(hostptr, baseptr, hostlen))
	return X509_V_ERR_PERMITTED_VIOLATION;

	return X509_V_OK;

	}