text: /* 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 "cryptlib.h"
  #include <openssl/asn1t.h>
  #include <openssl/conf.h>
  #include <openssl/x509v3.h>
  #ifdef OPENSSL_SYS_WINDOWS
  #include <stdio.h>
  #endif
  
  #ifdef  __cplusplus
  	extern "C" {
  #endif
  
  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);
  
  extern 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 (!TINYCLR_SSL_STRNCMP(val->name, "permitted", 9) && val->name[9])
  			{
  			ptree = &ncons->permittedSubtrees;
  			tval.name = val->name + 10;
  			}
  		else if (!TINYCLR_SSL_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 = (NAME_CONSTRAINTS*)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 (TINYCLR_SSL_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 (TINYCLR_SSL_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 (!TINYCLR_SSL_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 (TINYCLR_SSL_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 (TINYCLR_SSL_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 = TINYCLR_SSL_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 (!TINYCLR_SSL_STRNCASECMP(p, baseptr, base->length))
  				return X509_V_OK;
  			}
  		return X509_V_ERR_PERMITTED_VIOLATION;
  		}
  
  	if ((base->length != (int)hostlen) || TINYCLR_SSL_STRNCASECMP(hostptr, baseptr, hostlen))
  		return X509_V_ERR_PERMITTED_VIOLATION;
  
  	return X509_V_OK;
  
  	}
  #ifdef  __cplusplus
  }
  #endif
  
  