v3_purp.c

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/* v3_purp.c */
/* Written by Dr Stephen N Henson ([e-mail]) for the OpenSSL
 * project 1999.
 */
/* ====================================================================
 * Copyright (c) 1999 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
 *    [e-mail].
 *
 * 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
 * ([e-mail]).  This product includes software written by Tim
 * Hudson ([e-mail]).
 *
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/x509v3.h>
#include <openssl/x509_vfy.h>


static void x509v3_cache_extensions(X509 *x);

static int ca_check(const X509 *x);
static int check_ssl_ca(const X509 *x);
static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, int ca);
static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca);
static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca);
static int purpose_smime(const X509 *x, int ca);
static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, int ca);
static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, int ca);
static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, int ca);
static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca);

static int xp_cmp(const X509_PURPOSE * const *a,
		const X509_PURPOSE * const *b);
static void xptable_free(X509_PURPOSE *p);

static X509_PURPOSE xstandard[] = {
	{X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0, check_purpose_ssl_client, "SSL client", "sslclient", NULL},
	{X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ssl_server, "SSL server", "sslserver", NULL},
	{X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL},
	{X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign, "S/MIME signing", "smimesign", NULL},
	{X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0, check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL},
	{X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign, "CRL signing", "crlsign", NULL},
	{X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any", NULL},
};

#define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE))

IMPLEMENT_STACK_OF(X509_PURPOSE)

static STACK_OF(X509_PURPOSE) *xptable = NULL;

static int xp_cmp(const X509_PURPOSE * const *a,
		const X509_PURPOSE * const *b)
{
	return (*a)->purpose - (*b)->purpose;
}

/* As much as I'd like to make X509_check_purpose use a "const" X509*
 * I really can't because it does recalculate hashes and do other non-const
 * things. */
int X509_check_purpose(X509 *x, int id, int ca)
{
	int idx;
	const X509_PURPOSE *pt;
	if(!(x->ex_flags & EXFLAG_SET)) {
		CRYPTO_w_lock(CRYPTO_LOCK_X509);
		x509v3_cache_extensions(x);
		CRYPTO_w_unlock(CRYPTO_LOCK_X509);
	}
	if(id == -1) return 1;
	idx = X509_PURPOSE_get_by_id(id);
	if(idx == -1) return -1;
	pt = X509_PURPOSE_get0(idx);
	return pt->check_purpose(pt, x, ca);
}

int X509_PURPOSE_get_count(void)
{
	if(!xptable) return X509_PURPOSE_COUNT;
	return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT;
}

X509_PURPOSE * X509_PURPOSE_get0(int idx)
{
	if(idx < 0) return NULL;
	if(idx < X509_PURPOSE_COUNT) return xstandard + idx;
	return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT);
}

int X509_PURPOSE_get_by_sname(char *sname)
{
	int i;
	X509_PURPOSE *xptmp;
	for(i = 0; i < X509_PURPOSE_get_count(); i++) {
		xptmp = X509_PURPOSE_get0(i);
		if(!strcmp(xptmp->sname, sname)) return i;
	}
	return -1;
}


int X509_PURPOSE_get_by_id(int purpose)
{
	X509_PURPOSE tmp;
	int idx;
	if((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX))
		return purpose - X509_PURPOSE_MIN;
	tmp.purpose = purpose;
	if(!xptable) return -1;
	idx = sk_X509_PURPOSE_find(xptable, &tmp);
	if(idx == -1) return -1;
	return idx + X509_PURPOSE_COUNT;
}

int X509_PURPOSE_add(int id, int trust, int flags,
			int (*ck)(const X509_PURPOSE *, const X509 *, int),
					char *name, char *sname, void *arg)
{
	int idx;
	X509_PURPOSE *ptmp;
	/* This is set according to what we change: application can't set it */
	flags &= ~X509_PURPOSE_DYNAMIC;
	/* This will always be set for application modified trust entries */
	flags |= X509_PURPOSE_DYNAMIC_NAME;
	/* Get existing entry if any */
	idx = X509_PURPOSE_get_by_id(id);
	/* Need a new entry */
	if(idx == -1) {
		if(!(ptmp = OPENSSL_malloc(sizeof(X509_PURPOSE)))) {
			X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE);
			return 0;
		}
		ptmp->flags = X509_PURPOSE_DYNAMIC;
	} else ptmp = X509_PURPOSE_get0(idx);

	/* OPENSSL_free existing name if dynamic */
	if(ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) {
		OPENSSL_free(ptmp->name);
		OPENSSL_free(ptmp->sname);
	}
	/* dup supplied name */
	ptmp->name = BUF_strdup(name);
	ptmp->sname = BUF_strdup(sname);
	if(!ptmp->name || !ptmp->sname) {
		X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE);
		return 0;
	}
	/* Keep the dynamic flag of existing entry */
	ptmp->flags &= X509_PURPOSE_DYNAMIC;
	/* Set all other flags */
	ptmp->flags |= flags;

	ptmp->purpose = id;
	ptmp->trust = trust;
	ptmp->check_purpose = ck;
	ptmp->usr_data = arg;

	/* If its a new entry manage the dynamic table */
	if(idx == -1) {
		if(!xptable && !(xptable = sk_X509_PURPOSE_new(xp_cmp))) {
			X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE);
			return 0;
		}
		if (!sk_X509_PURPOSE_push(xptable, ptmp)) {
			X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE);
			return 0;
		}
	}
	return 1;
}

static void xptable_free(X509_PURPOSE *p)
	{
	if(!p) return;
	if (p->flags & X509_PURPOSE_DYNAMIC) 
		{
		if (p->flags & X509_PURPOSE_DYNAMIC_NAME) {
			OPENSSL_free(p->name);
			OPENSSL_free(p->sname);
		}
		OPENSSL_free(p);
		}
	}

void X509_PURPOSE_cleanup(void)
{
	int i;
	sk_X509_PURPOSE_pop_free(xptable, xptable_free);
	for(i = 0; i < X509_PURPOSE_COUNT; i++) xptable_free(xstandard + i);
	xptable = NULL;
}

int X509_PURPOSE_get_id(X509_PURPOSE *xp)
{
	return xp->purpose;
}

char *X509_PURPOSE_get0_name(X509_PURPOSE *xp)
{
	return xp->name;
}

char *X509_PURPOSE_get0_sname(X509_PURPOSE *xp)
{
	return xp->sname;
}

int X509_PURPOSE_get_trust(X509_PURPOSE *xp)
{
	return xp->trust;
}

static void x509v3_cache_extensions(X509 *x)
{
	BASIC_CONSTRAINTS *bs;
	ASN1_BIT_STRING *usage;
	ASN1_BIT_STRING *ns;
	STACK_OF(ASN1_OBJECT) *extusage;
	
	int i;
	if(x->ex_flags & EXFLAG_SET) return;