/* $OpenBSD: x509_vpm.c,v 1.8 2014/07/10 13:58:23 jsing Exp $ */
/* 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 <stdio.h>
#include <string.h>

#include <openssl/buffer.h>
#include <openssl/crypto.h>
#include <openssl/lhash.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

/* X509_VERIFY_PARAM functions */

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;
	}
}

X509_VERIFY_PARAM *
X509_VERIFY_PARAM_new(void)
{
	X509_VERIFY_PARAM *param;

	param = calloc(1, sizeof(X509_VERIFY_PARAM));
	x509_verify_param_zero(param);
	return param;
}

void
X509_VERIFY_PARAM_free(X509_VERIFY_PARAM *param)
{
	x509_verify_param_zero(param);
	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;
	}

	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;
}

int
X509_VERIFY_PARAM_set1_name(X509_VERIFY_PARAM *param, const char *name)
{
	free(param->name);
	param->name = BUF_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;
	if (flags & X509_V_FLAG_POLICY_MASK)
		param->flags |= X509_V_FLAG_POLICY_CHECK;
	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(X509_VERIFY_PARAM *param, time_t t)
{
	param->check_time = t;
	param->flags |= X509_V_FLAG_USE_CHECK_TIME;
}

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,
    STACK_OF(ASN1_OBJECT) *policies)
{
	int i;
	ASN1_OBJECT *oid, *doid;

	if (!param)
		return 0;
	if (param->policies)
		sk_ASN1_OBJECT_pop_free(param->policies, ASN1_OBJECT_free);

	if (!policies) {
		param->policies = NULL;
		return 1;
	}

	param->policies = sk_ASN1_OBJECT_new_null();
	if (!param->policies)
		return 0;

	for (i = 0; i < sk_ASN1_OBJECT_num(policies); i++) {
		oid = sk_ASN1_OBJECT_value(policies, i);
		doid = OBJ_dup(oid);
		if (!doid)
			return 0;
		if (!sk_ASN1_OBJECT_push(param->policies, doid)) {
			ASN1_OBJECT_free(doid);
			return 0;
		}
	}
	param->flags |= X509_V_FLAG_POLICY_CHECK;
	return 1;
}

int
X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param)
{
	return param->depth;
}

/* 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[] = {
	{
		"default",			/* X509 default parameters */
		0,				/* Check time */
		0,				/* internal flags */
		0,				/* flags */
		0,				/* purpose */
		0,				/* trust */
		100,				/* depth */
		NULL				/* policies */
	},
	{
		"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 */
	},
	{
		"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 */
	},
	{
		"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 */
	},
	{
		"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 */
	}
};

static STACK_OF(X509_VERIFY_PARAM) *param_table = NULL;

static int
table_cmp(const X509_VERIFY_PARAM *a, const X509_VERIFY_PARAM *b)
{
	return strcmp(a->name, b->name);
}

DECLARE_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);
IMPLEMENT_OBJ_BSEARCH_CMP_FN(X509_VERIFY_PARAM, X509_VERIFY_PARAM, table);

static int
param_cmp(const X509_VERIFY_PARAM * const *a,
    const X509_VERIFY_PARAM * const *b)
{
	return strcmp((*a)->name, (*b)->name);
}

int
X509_VERIFY_PARAM_add0_table(X509_VERIFY_PARAM *param)
{
	int idx;
	X509_VERIFY_PARAM *ptmp;

	if (!param_table) {
		param_table = sk_X509_VERIFY_PARAM_new(param_cmp);
		if (!param_table)
			return 0;
	} else {
		idx = sk_X509_VERIFY_PARAM_find(param_table, param);
		if (idx != -1) {
			ptmp = sk_X509_VERIFY_PARAM_value(param_table, idx);
			X509_VERIFY_PARAM_free(ptmp);
			(void)sk_X509_VERIFY_PARAM_delete(param_table, idx);
		}
	}
	if (!sk_X509_VERIFY_PARAM_push(param_table, param))
		return 0;
	return 1;
}

const X509_VERIFY_PARAM *
X509_VERIFY_PARAM_lookup(const char *name)
{
	int idx;
	X509_VERIFY_PARAM pm;

	pm.name = (char *)name;
	if (param_table) {
		idx = sk_X509_VERIFY_PARAM_find(param_table, &pm);
		if (idx != -1)
			return sk_X509_VERIFY_PARAM_value(param_table, idx);
	}
	return OBJ_bsearch_table(&pm, default_table,
	    sizeof(default_table)/sizeof(X509_VERIFY_PARAM));
}

void
X509_VERIFY_PARAM_table_cleanup(void)
{
	if (param_table)
		sk_X509_VERIFY_PARAM_pop_free(param_table,
		    X509_VERIFY_PARAM_free);
	param_table = NULL;
}