Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/x509v3/v3_ncons.c	Lines:	2	183	1.1 %
Date:	2017-11-07	Branches:	0	156	0.0 %


/* $OpenBSD: v3_ncons.c,v 1.13 2017/07/20 19:45:08 tedu Exp $ */
/* 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 <string.h>

#include <openssl/asn1t.h>
#include <openssl/conf.h>
#include <openssl/err.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 = {
	.ext_nid = NID_name_constraints,
	.ext_flags = 0,
	.it = &NAME_CONSTRAINTS_it,
	.ext_new = NULL,
	.ext_free = NULL,
	.d2i = NULL,
	.i2d = NULL,
	.i2s = NULL,
	.s2i = NULL,
	.i2v = NULL,
	.v2i = v2i_NAME_CONSTRAINTS,
	.i2r = i2r_NAME_CONSTRAINTS,
	.r2i = NULL,
	.usr_data = NULL,
};

static const ASN1_TEMPLATE GENERAL_SUBTREE_seq_tt[] = {
	{
		.flags = 0,
		.tag = 0,
		.offset = offsetof(GENERAL_SUBTREE, base),
		.field_name = "base",
		.item = &GENERAL_NAME_it,
	},
	{
		.flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_OPTIONAL,
		.tag = 0,
		.offset = offsetof(GENERAL_SUBTREE, minimum),
		.field_name = "minimum",
		.item = &ASN1_INTEGER_it,
	},
	{
		.flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_OPTIONAL,
		.tag = 1,
		.offset = offsetof(GENERAL_SUBTREE, maximum),
		.field_name = "maximum",
		.item = &ASN1_INTEGER_it,
	},
};

const ASN1_ITEM GENERAL_SUBTREE_it = {
	.itype = ASN1_ITYPE_SEQUENCE,
	.utype = V_ASN1_SEQUENCE,
	.templates = GENERAL_SUBTREE_seq_tt,
	.tcount = sizeof(GENERAL_SUBTREE_seq_tt) / sizeof(ASN1_TEMPLATE),
	.funcs = NULL,
	.size = sizeof(GENERAL_SUBTREE),
	.sname = "GENERAL_SUBTREE",
};

static const ASN1_TEMPLATE NAME_CONSTRAINTS_seq_tt[] = {
	{
		.flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_SEQUENCE_OF | ASN1_TFLG_OPTIONAL,
		.tag = 0,
		.offset = offsetof(NAME_CONSTRAINTS, permittedSubtrees),
		.field_name = "permittedSubtrees",
		.item = &GENERAL_SUBTREE_it,
	},
	{
		.flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_SEQUENCE_OF | ASN1_TFLG_OPTIONAL,
		.tag = 1,
		.offset = offsetof(NAME_CONSTRAINTS, excludedSubtrees),
		.field_name = "excludedSubtrees",
		.item = &GENERAL_SUBTREE_it,
	},
};

const ASN1_ITEM NAME_CONSTRAINTS_it = {
	.itype = ASN1_ITYPE_SEQUENCE,
	.utype = V_ASN1_SEQUENCE,
	.templates = NAME_CONSTRAINTS_seq_tt,
	.tcount = sizeof(NAME_CONSTRAINTS_seq_tt) / sizeof(ASN1_TEMPLATE),
	.funcs = NULL,
	.size = sizeof(NAME_CONSTRAINTS),
	.sname = "NAME_CONSTRAINTS",
};


GENERAL_SUBTREE *
GENERAL_SUBTREE_new(void)
{
	return (GENERAL_SUBTREE*)ASN1_item_new(&GENERAL_SUBTREE_it);
}

void
GENERAL_SUBTREE_free(GENERAL_SUBTREE *a)
{
	ASN1_item_free((ASN1_VALUE *)a, &GENERAL_SUBTREE_it);
}

NAME_CONSTRAINTS *
NAME_CONSTRAINTS_new(void)
{
	return (NAME_CONSTRAINTS*)ASN1_item_new(&NAME_CONSTRAINTS_it);
}

void
NAME_CONSTRAINTS_free(NAME_CONSTRAINTS *a)
{
	ASN1_item_free((ASN1_VALUE *)a, &NAME_CONSTRAINTS_it);
}

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 {
			X509V3error(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:
	X509V3error(ERR_R_MALLOC_FAILURE);
err:
	NAME_CONSTRAINTS_free(ncons);
	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 (baseptr[0] != '.' && 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;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: v3_ncons.c,v 1.13 2017/07/20 19:45:08 tedu Exp $ */
2			/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3			* project.
4			*/
5			/* ====================================================================
6			* Copyright (c) 2003 The OpenSSL Project. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			*
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			*
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in
17			* the documentation and/or other materials provided with the
18			* distribution.
19			*
20			* 3. All advertising materials mentioning features or use of this
21			* software must display the following acknowledgment:
22			* "This product includes software developed by the OpenSSL Project
23			* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24			*
25			* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26			* endorse or promote products derived from this software without
27			* prior written permission. For written permission, please contact
28			* licensing@OpenSSL.org.
29			*
30			* 5. Products derived from this software may not be called "OpenSSL"
31			* nor may "OpenSSL" appear in their names without prior written
32			* permission of the OpenSSL Project.
33			*
34			* 6. Redistributions of any form whatsoever must retain the following
35			* acknowledgment:
36			* "This product includes software developed by the OpenSSL Project
37			* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38			*
39			* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40			* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50			* OF THE POSSIBILITY OF SUCH DAMAGE.
51			* ====================================================================
52			*
53			* This product includes cryptographic software written by Eric Young
54			* (eay@cryptsoft.com). This product includes software written by Tim
55			* Hudson (tjh@cryptsoft.com).
56			*
57			*/
58
59			#include <stdio.h>
60			#include <string.h>
61
62			#include <openssl/asn1t.h>
63			#include <openssl/conf.h>
64			#include <openssl/err.h>
65			#include <openssl/x509v3.h>
66
67			static void v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD method,
68			X509V3_CTX ctx, STACK_OF(CONF_VALUE) nval);
69			static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
70			void a, BIO bp, int ind);
71			static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
72			STACK_OF(GENERAL_SUBTREE) trees, BIO bp, int ind, char *name);
73			static int print_nc_ipadd(BIO bp, ASN1_OCTET_STRING ip);
74
75			static int nc_match(GENERAL_NAME gen, NAME_CONSTRAINTS nc);
76			static int nc_match_single(GENERAL_NAME sub, GENERAL_NAME gen);
77			static int nc_dn(X509_NAME sub, X509_NAME nm);
78			static int nc_dns(ASN1_IA5STRING sub, ASN1_IA5STRING dns);
79			static int nc_email(ASN1_IA5STRING sub, ASN1_IA5STRING eml);
80			static int nc_uri(ASN1_IA5STRING uri, ASN1_IA5STRING base);
81
82			const X509V3_EXT_METHOD v3_name_constraints = {
83			.ext_nid = NID_name_constraints,
84			.ext_flags = 0,
85			.it = &NAME_CONSTRAINTS_it,
86			.ext_new = NULL,
87			.ext_free = NULL,
88			.d2i = NULL,
89			.i2d = NULL,
90			.i2s = NULL,
91			.s2i = NULL,
92			.i2v = NULL,
93			.v2i = v2i_NAME_CONSTRAINTS,
94			.i2r = i2r_NAME_CONSTRAINTS,
95			.r2i = NULL,
96			.usr_data = NULL,
97			};
98
99			static const ASN1_TEMPLATE GENERAL_SUBTREE_seq_tt[] = {
100			{
101			.flags = 0,
102			.tag = 0,
103			.offset = offsetof(GENERAL_SUBTREE, base),
104			.field_name = "base",
105			.item = &GENERAL_NAME_it,
106			},
107			{
108			.flags = ASN1_TFLG_IMPLICIT \| ASN1_TFLG_OPTIONAL,
109			.tag = 0,
110			.offset = offsetof(GENERAL_SUBTREE, minimum),
111			.field_name = "minimum",
112			.item = &ASN1_INTEGER_it,
113			},
114			{
115			.flags = ASN1_TFLG_IMPLICIT \| ASN1_TFLG_OPTIONAL,
116			.tag = 1,
117			.offset = offsetof(GENERAL_SUBTREE, maximum),
118			.field_name = "maximum",
119			.item = &ASN1_INTEGER_it,
120			},
121			};
122
123			const ASN1_ITEM GENERAL_SUBTREE_it = {
124			.itype = ASN1_ITYPE_SEQUENCE,
125			.utype = V_ASN1_SEQUENCE,
126			.templates = GENERAL_SUBTREE_seq_tt,
127			.tcount = sizeof(GENERAL_SUBTREE_seq_tt) / sizeof(ASN1_TEMPLATE),
128			.funcs = NULL,
129			.size = sizeof(GENERAL_SUBTREE),
130			.sname = "GENERAL_SUBTREE",
131			};
132
133			static const ASN1_TEMPLATE NAME_CONSTRAINTS_seq_tt[] = {
134			{
135			.flags = ASN1_TFLG_IMPLICIT \| ASN1_TFLG_SEQUENCE_OF \| ASN1_TFLG_OPTIONAL,
136			.tag = 0,
137			.offset = offsetof(NAME_CONSTRAINTS, permittedSubtrees),
138			.field_name = "permittedSubtrees",
139			.item = &GENERAL_SUBTREE_it,
140			},
141			{
142			.flags = ASN1_TFLG_IMPLICIT \| ASN1_TFLG_SEQUENCE_OF \| ASN1_TFLG_OPTIONAL,
143			.tag = 1,
144			.offset = offsetof(NAME_CONSTRAINTS, excludedSubtrees),
145			.field_name = "excludedSubtrees",
146			.item = &GENERAL_SUBTREE_it,
147			},
148			};
149
150			const ASN1_ITEM NAME_CONSTRAINTS_it = {
151			.itype = ASN1_ITYPE_SEQUENCE,
152			.utype = V_ASN1_SEQUENCE,
153			.templates = NAME_CONSTRAINTS_seq_tt,
154			.tcount = sizeof(NAME_CONSTRAINTS_seq_tt) / sizeof(ASN1_TEMPLATE),
155			.funcs = NULL,
156			.size = sizeof(NAME_CONSTRAINTS),
157			.sname = "NAME_CONSTRAINTS",
158			};
159
160
161			GENERAL_SUBTREE *
162			GENERAL_SUBTREE_new(void)
163			{
164			return (GENERAL_SUBTREE*)ASN1_item_new(&GENERAL_SUBTREE_it);
165			}
166
167			void
168			GENERAL_SUBTREE_free(GENERAL_SUBTREE *a)
169			{
170			ASN1_item_free((ASN1_VALUE *)a, &GENERAL_SUBTREE_it);
171			}
172
173			NAME_CONSTRAINTS *
174			NAME_CONSTRAINTS_new(void)
175			{
176			return (NAME_CONSTRAINTS*)ASN1_item_new(&NAME_CONSTRAINTS_it);
177			}
178
179			void
180			NAME_CONSTRAINTS_free(NAME_CONSTRAINTS *a)
181			{
182		31072	ASN1_item_free((ASN1_VALUE *)a, &NAME_CONSTRAINTS_it);
183		15536	}
184
185			static void *
186			v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD method, X509V3_CTX ctx,
187			STACK_OF(CONF_VALUE) *nval)
188			{
189			int i;
190			CONF_VALUE tval, *val;
191			STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
192			NAME_CONSTRAINTS *ncons = NULL;
193			GENERAL_SUBTREE *sub = NULL;
194
195			ncons = NAME_CONSTRAINTS_new();
196			if (!ncons)
197			goto memerr;
198			for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
199			val = sk_CONF_VALUE_value(nval, i);
200			if (!strncmp(val->name, "permitted", 9) && val->name[9]) {
201			ptree = &ncons->permittedSubtrees;
202			tval.name = val->name + 10;
203			} else if (!strncmp(val->name, "excluded", 8) && val->name[8]) {
204			ptree = &ncons->excludedSubtrees;
205			tval.name = val->name + 9;
206			} else {
207			X509V3error(X509V3_R_INVALID_SYNTAX);
208			goto err;
209			}
210			tval.value = val->value;
211			sub = GENERAL_SUBTREE_new();
212			if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
213			goto err;
214			if (!*ptree)
215			*ptree = sk_GENERAL_SUBTREE_new_null();
216			if (!ptree \|\| !sk_GENERAL_SUBTREE_push(ptree, sub))
217			goto memerr;
218			sub = NULL;
219			}
220
221			return ncons;
222
223			memerr:
224			X509V3error(ERR_R_MALLOC_FAILURE);
225			err:
226			NAME_CONSTRAINTS_free(ncons);
227			GENERAL_SUBTREE_free(sub);
228			return NULL;
229			}
230
231			static int
232			i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD method, void a, BIO *bp, int ind)
233			{
234			NAME_CONSTRAINTS *ncons = a;
235
236			do_i2r_name_constraints(method, ncons->permittedSubtrees,
237			bp, ind, "Permitted");
238			do_i2r_name_constraints(method, ncons->excludedSubtrees,
239			bp, ind, "Excluded");
240			return 1;
241			}
242
243			static int
244			do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
245			STACK_OF(GENERAL_SUBTREE) trees, BIO bp, int ind, char *name)
246			{
247			GENERAL_SUBTREE *tree;
248			int i;
249
250			if (sk_GENERAL_SUBTREE_num(trees) > 0)
251			BIO_printf(bp, "%*s%s:\n", ind, "", name);
252			for (i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++) {
253			tree = sk_GENERAL_SUBTREE_value(trees, i);
254			BIO_printf(bp, "%*s", ind + 2, "");
255			if (tree->base->type == GEN_IPADD)
256			print_nc_ipadd(bp, tree->base->d.ip);
257			else
258			GENERAL_NAME_print(bp, tree->base);
259			BIO_puts(bp, "\n");
260			}
261			return 1;
262			}
263
264			static int
265			print_nc_ipadd(BIO bp, ASN1_OCTET_STRING ip)
266			{
267			int i, len;
268			unsigned char *p;
269
270			p = ip->data;
271			len = ip->length;
272			BIO_puts(bp, "IP:");
273			if (len == 8) {
274			BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
275			p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
276			} else if (len == 32) {
277			for (i = 0; i < 16; i++) {
278			BIO_printf(bp, "%X", p[0] << 8 \| p[1]);
279			p += 2;
280			if (i == 7)
281			BIO_puts(bp, "/");
282			else if (i != 15)
283			BIO_puts(bp, ":");
284			}
285			} else
286			BIO_printf(bp, "IP Address:<invalid>");
287			return 1;
288			}
289
290			/* Check a certificate conforms to a specified set of constraints.
291			* Return values:
292			* X509_V_OK: All constraints obeyed.
293			* X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
294			* X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
295			* X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
296			* X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: Unsupported constraint type.
297			* X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
298			* X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
299			*/
300
301			int
302			NAME_CONSTRAINTS_check(X509 x, NAME_CONSTRAINTS nc)
303			{
304			int r, i;
305			X509_NAME *nm;
306
307			nm = X509_get_subject_name(x);
308
309			if (X509_NAME_entry_count(nm) > 0) {
310			GENERAL_NAME gntmp;
311			gntmp.type = GEN_DIRNAME;
312			gntmp.d.directoryName = nm;
313
314			r = nc_match(&gntmp, nc);
315
316			if (r != X509_V_OK)
317			return r;
318
319			gntmp.type = GEN_EMAIL;
320
321			/* Process any email address attributes in subject name */
322
323			for (i = -1;;) {
324			X509_NAME_ENTRY *ne;
325			i = X509_NAME_get_index_by_NID(nm,
326			NID_pkcs9_emailAddress, i);
327			if (i == -1)
328			break;
329			ne = X509_NAME_get_entry(nm, i);
330			gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
331			if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
332			return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
333
334			r = nc_match(&gntmp, nc);
335
336			if (r != X509_V_OK)
337			return r;
338			}
339
340			}
341
342			for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++) {
343			GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
344			r = nc_match(gen, nc);
345			if (r != X509_V_OK)
346			return r;
347			}
348
349			return X509_V_OK;
350			}
351
352			static int
353			nc_match(GENERAL_NAME gen, NAME_CONSTRAINTS nc)
354			{
355			GENERAL_SUBTREE *sub;
356			int i, r, match = 0;
357
358			/* Permitted subtrees: if any subtrees exist of matching the type
359			* at least one subtree must match.
360			*/
361
362			for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++) {
363			sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
364			if (gen->type != sub->base->type)
365			continue;
366			if (sub->minimum \|\| sub->maximum)
367			return X509_V_ERR_SUBTREE_MINMAX;
368			/* If we already have a match don't bother trying any more */
369			if (match == 2)
370			continue;
371			if (match == 0)
372			match = 1;
373			r = nc_match_single(gen, sub->base);
374			if (r == X509_V_OK)
375			match = 2;
376			else if (r != X509_V_ERR_PERMITTED_VIOLATION)
377			return r;
378			}
379
380			if (match == 1)
381			return X509_V_ERR_PERMITTED_VIOLATION;
382
383			/* Excluded subtrees: must not match any of these */
384
385			for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++) {
386			sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
387			if (gen->type != sub->base->type)
388			continue;
389			if (sub->minimum \|\| sub->maximum)
390			return X509_V_ERR_SUBTREE_MINMAX;
391
392			r = nc_match_single(gen, sub->base);
393			if (r == X509_V_OK)
394			return X509_V_ERR_EXCLUDED_VIOLATION;
395			else if (r != X509_V_ERR_PERMITTED_VIOLATION)
396			return r;
397
398			}
399
400			return X509_V_OK;
401			}
402
403			static int
404			nc_match_single(GENERAL_NAME gen, GENERAL_NAME base)
405			{
406			switch (base->type) {
407			case GEN_DIRNAME:
408			return nc_dn(gen->d.directoryName, base->d.directoryName);
409
410			case GEN_DNS:
411			return nc_dns(gen->d.dNSName, base->d.dNSName);
412
413			case GEN_EMAIL:
414			return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
415
416			case GEN_URI:
417			return nc_uri(gen->d.uniformResourceIdentifier,
418			base->d.uniformResourceIdentifier);
419
420			default:
421			return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
422			}
423			}
424
425			/* directoryName name constraint matching.
426			* The canonical encoding of X509_NAME makes this comparison easy. It is
427			* matched if the subtree is a subset of the name.
428			*/
429
430			static int
431			nc_dn(X509_NAME nm, X509_NAME base)
432			{
433			/* Ensure canonical encodings are up to date. */
434			if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
435			return X509_V_ERR_OUT_OF_MEM;
436			if (base->modified && i2d_X509_NAME(base, NULL) < 0)
437			return X509_V_ERR_OUT_OF_MEM;
438			if (base->canon_enclen > nm->canon_enclen)
439			return X509_V_ERR_PERMITTED_VIOLATION;
440			if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
441			return X509_V_ERR_PERMITTED_VIOLATION;
442			return X509_V_OK;
443			}
444
445			static int
446			nc_dns(ASN1_IA5STRING dns, ASN1_IA5STRING base)
447			{
448			char baseptr = (char )base->data;
449			char dnsptr = (char )dns->data;
450
451			/* Empty matches everything */
452			if (!*baseptr)
453			return X509_V_OK;
454			/* Otherwise can add zero or more components on the left so
455			* compare RHS and if dns is longer and expect '.' as preceding
456			* character.
457			*/
458			if (dns->length > base->length) {
459			dnsptr += dns->length - base->length;
460			if (baseptr[0] != '.' && dnsptr[-1] != '.')
461			return X509_V_ERR_PERMITTED_VIOLATION;
462			}
463
464			if (strcasecmp(baseptr, dnsptr))
465			return X509_V_ERR_PERMITTED_VIOLATION;
466
467			return X509_V_OK;
468			}
469
470			static int
471			nc_email(ASN1_IA5STRING eml, ASN1_IA5STRING base)
472			{
473			const char baseptr = (char )base->data;
474			const char emlptr = (char )eml->data;
475			const char *baseat = strchr(baseptr, '@');
476			const char *emlat = strchr(emlptr, '@');
477
478			if (!emlat)
479			return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
480			/* Special case: inital '.' is RHS match */
481			if (!baseat && (*baseptr == '.')) {
482			if (eml->length > base->length) {
483			emlptr += eml->length - base->length;
484			if (!strcasecmp(baseptr, emlptr))
485			return X509_V_OK;
486			}
487			return X509_V_ERR_PERMITTED_VIOLATION;
488			}
489
490			/* If we have anything before '@' match local part */
491
492			if (baseat) {
493			if (baseat != baseptr) {
494			if ((baseat - baseptr) != (emlat - emlptr))
495			return X509_V_ERR_PERMITTED_VIOLATION;
496			/* Case sensitive match of local part */
497			if (strncmp(baseptr, emlptr, emlat - emlptr))
498			return X509_V_ERR_PERMITTED_VIOLATION;
499			}
500			/* Position base after '@' */
501			baseptr = baseat + 1;
502			}
503			emlptr = emlat + 1;
504			/* Just have hostname left to match: case insensitive */
505			if (strcasecmp(baseptr, emlptr))
506			return X509_V_ERR_PERMITTED_VIOLATION;
507
508			return X509_V_OK;
509			}
510
511			static int
512			nc_uri(ASN1_IA5STRING uri, ASN1_IA5STRING base)
513			{
514			const char baseptr = (char )base->data;
515			const char hostptr = (char )uri->data;
516			const char *p = strchr(hostptr, ':');
517			int hostlen;
518
519			/* Check for foo:// and skip past it */
520			if (!p \|\| (p[1] != '/') \|\| (p[2] != '/'))
521			return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
522			hostptr = p + 3;
523
524			/* Determine length of hostname part of URI */
525
526			/* Look for a port indicator as end of hostname first */
527
528			p = strchr(hostptr, ':');
529			/* Otherwise look for trailing slash */
530			if (!p)
531			p = strchr(hostptr, '/');
532
533			if (!p)
534			hostlen = strlen(hostptr);
535			else
536			hostlen = p - hostptr;
537
538			if (hostlen == 0)
539			return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
540
541			/* Special case: inital '.' is RHS match */
542			if (*baseptr == '.') {
543			if (hostlen > base->length) {
544			p = hostptr + hostlen - base->length;
545			if (!strncasecmp(p, baseptr, base->length))
546			return X509_V_OK;
547			}
548			return X509_V_ERR_PERMITTED_VIOLATION;
549			}
550
551			if ((base->length != (int)hostlen) \|\|
552			strncasecmp(hostptr, baseptr, hostlen))
553			return X509_V_ERR_PERMITTED_VIOLATION;
554
555			return X509_V_OK;
556			}