ssl/ssl_cert.c

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright (c) 1998-2007 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
 *    openssl-core@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).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * ECC cipher suite support in OpenSSL originally developed by
 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. */

#include <stdio.h>

#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/buf.h>
#include <openssl/dh.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>

#include "../crypto/dh/internal.h"
#include "../crypto/directory.h"
#include "ssl_locl.h"

int SSL_get_ex_data_X509_STORE_CTX_idx(void)
	{
	static volatile int ssl_x509_store_ctx_idx= -1;
	int got_write_lock = 0;

	CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);

	if (ssl_x509_store_ctx_idx < 0)
		{
		CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
		CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
		got_write_lock = 1;
		
		if (ssl_x509_store_ctx_idx < 0)
			{
			ssl_x509_store_ctx_idx=X509_STORE_CTX_get_ex_new_index(
				0,"SSL for verify callback",NULL,NULL,NULL);
			}
		}

	if (got_write_lock)
		CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
	else
		CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
	
	return ssl_x509_store_ctx_idx;
	}

CERT *ssl_cert_new(void)
	{
	CERT *ret;

	ret=(CERT *)OPENSSL_malloc(sizeof(CERT));
	if (ret == NULL)
		{
		OPENSSL_PUT_ERROR(SSL, ssl_cert_new, ERR_R_MALLOC_FAILURE);
		return(NULL);
		}
	memset(ret,0,sizeof(CERT));

	ret->key= &(ret->pkeys[SSL_PKEY_RSA_ENC]);
	return(ret);
	}

CERT *ssl_cert_dup(CERT *cert)
	{
	CERT *ret;
	int i;

	ret = (CERT *)OPENSSL_malloc(sizeof(CERT));
	if (ret == NULL)
		{
		OPENSSL_PUT_ERROR(SSL, ssl_cert_dup, ERR_R_MALLOC_FAILURE);
		return(NULL);
		}

	memset(ret, 0, sizeof(CERT));

	ret->key = &ret->pkeys[cert->key - &cert->pkeys[0]];
	/* or ret->key = ret->pkeys + (cert->key - cert->pkeys),
	 * if you find that more readable */

	ret->mask_k = cert->mask_k;
	ret->mask_a = cert->mask_a;

	if (cert->dh_tmp != NULL)
		{
		ret->dh_tmp = DHparams_dup(cert->dh_tmp);
		if (ret->dh_tmp == NULL)
			{
			OPENSSL_PUT_ERROR(SSL, ssl_cert_dup, ERR_R_DH_LIB);
			goto err;
			}
		if (cert->dh_tmp->priv_key)
			{
			BIGNUM *b = BN_dup(cert->dh_tmp->priv_key);
			if (!b)
				{
				OPENSSL_PUT_ERROR(SSL, ssl_cert_dup, ERR_R_BN_LIB);
				goto err;
				}
			ret->dh_tmp->priv_key = b;
			}
		if (cert->dh_tmp->pub_key)
			{
			BIGNUM *b = BN_dup(cert->dh_tmp->pub_key);
			if (!b)
				{
				OPENSSL_PUT_ERROR(SSL, ssl_cert_dup, ERR_R_BN_LIB);
				goto err;
				}
			ret->dh_tmp->pub_key = b;
			}
		}
	ret->dh_tmp_cb = cert->dh_tmp_cb;

	if (cert->ecdh_tmp)
		{
		ret->ecdh_tmp = EC_KEY_dup(cert->ecdh_tmp);
		if (ret->ecdh_tmp == NULL)
			{
			OPENSSL_PUT_ERROR(SSL, ssl_cert_dup, ERR_R_EC_LIB);
			goto err;
			}
		}
	ret->ecdh_tmp_cb = cert->ecdh_tmp_cb;
	ret->ecdh_tmp_auto = cert->ecdh_tmp_auto;

	for (i = 0; i < SSL_PKEY_NUM; i++)
		{
		CERT_PKEY *cpk = cert->pkeys + i;
		CERT_PKEY *rpk = ret->pkeys + i;
		if (cpk->x509 != NULL)
			{
			rpk->x509 = X509_up_ref(cpk->x509);
			}
		
		if (cpk->privatekey != NULL)
			{
			rpk->privatekey = EVP_PKEY_dup(cpk->privatekey);
			}

		if (cpk->chain)
			{
			rpk->chain = X509_chain_up_ref(cpk->chain);
			if (!rpk->chain)
				{
				OPENSSL_PUT_ERROR(SSL, ssl_cert_dup, ERR_R_MALLOC_FAILURE);
				goto err;
				}
			}
		}
	
	/* Peer sigalgs set to NULL as we get these from handshake too */
	ret->peer_sigalgs = NULL;
	ret->peer_sigalgslen = 0;
	/* Configured sigalgs however we copy across */

	if (cert->conf_sigalgs)
		{
		ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen);
		if (!ret->conf_sigalgs)
			goto err;
		memcpy(ret->conf_sigalgs, cert->conf_sigalgs,
						cert->conf_sigalgslen);
		ret->conf_sigalgslen = cert->conf_sigalgslen;
		}
	else
		ret->conf_sigalgs = NULL;

	if (cert->client_sigalgs)
		{
		ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen);
		if (!ret->client_sigalgs)
			goto err;
		memcpy(ret->client_sigalgs, cert->client_sigalgs,
						cert->client_sigalgslen);
		ret->client_sigalgslen = cert->client_sigalgslen;
		}
	else
		ret->client_sigalgs = NULL;
	/* Shared sigalgs also NULL */
	ret->shared_sigalgs = NULL;
	/* Copy any custom client certificate types */
	if (cert->client_certificate_types)
		{
		ret->client_certificate_types = BUF_memdup(
			cert->client_certificate_types,
			cert->num_client_certificate_types);
		if (!ret->client_certificate_types)
			goto err;
		ret->num_client_certificate_types = cert->num_client_certificate_types;
		}

	ret->cert_flags = cert->cert_flags;

	ret->cert_cb = cert->cert_cb;
	ret->cert_cb_arg = cert->cert_cb_arg;

	if (cert->verify_store)
		{
		CRYPTO_add(&cert->verify_store->references, 1, CRYPTO_LOCK_X509_STORE);
		ret->verify_store = cert->verify_store;
		}

	if (cert->chain_store)
		{
		CRYPTO_add(&cert->chain_store->references, 1, CRYPTO_LOCK_X509_STORE);
		ret->chain_store = cert->chain_store;
		}

	ret->ciphers_raw = NULL;

	return(ret);
	
err:
	ssl_cert_free(ret);
	return NULL;
	}

/* Free up and clear all certificates and chains */

void ssl_cert_clear_certs(CERT *c)
	{
	int i;
	if (c == NULL)
		return;
	for (i = 0; i<SSL_PKEY_NUM; i++)
		{
		CERT_PKEY *cpk = c->pkeys + i;
		if (cpk->x509)
			{
			X509_free(cpk->x509);
			cpk->x509 = NULL;
			}
		if (cpk->privatekey)
			{
			EVP_PKEY_free(cpk->privatekey);
			cpk->privatekey = NULL;
			}
		if (cpk->chain)
			{
			sk_X509_pop_free(cpk->chain, X509_free);
			cpk->chain = NULL;
			}
		}
	}

void ssl_cert_free(CERT *c)
	{
	if(c == NULL)
	    return;

	if (c->dh_tmp) DH_free(c->dh_tmp);
	if (c->ecdh_tmp) EC_KEY_free(c->ecdh_tmp);

	ssl_cert_clear_certs(c);
	if (c->peer_sigalgs)
		OPENSSL_free(c->peer_sigalgs);
	if (c->conf_sigalgs)
		OPENSSL_free(c->conf_sigalgs);
	if (c->client_sigalgs)
		OPENSSL_free(c->client_sigalgs);
	if (c->shared_sigalgs)
		OPENSSL_free(c->shared_sigalgs);
	if (c->client_certificate_types)
		OPENSSL_free(c->client_certificate_types);
	if (c->verify_store)
		X509_STORE_free(c->verify_store);
	if (c->chain_store)
		X509_STORE_free(c->chain_store);
	if (c->ciphers_raw)
		OPENSSL_free(c->ciphers_raw);
	OPENSSL_free(c);
	}

int ssl_cert_inst(CERT **o)
	{
	/* Create a CERT if there isn't already one
	 * (which cannot really happen, as it is initially created in
	 * SSL_CTX_new; but the earlier code usually allows for that one
	 * being non-existant, so we follow that behaviour, as it might
	 * turn out that there actually is a reason for it -- but I'm
	 * not sure that *all* of the existing code could cope with
	 * s->cert being NULL, otherwise we could do without the
	 * initialization in SSL_CTX_new).
	 */
	
	if (o == NULL) 
		{
		OPENSSL_PUT_ERROR(SSL, ssl_cert_inst, ERR_R_PASSED_NULL_PARAMETER);
		return(0);
		}
	if (*o == NULL)
		{
		if ((*o = ssl_cert_new()) == NULL)
			{
			OPENSSL_PUT_ERROR(SSL, ssl_cert_new, ERR_R_MALLOC_FAILURE);
			return(0);
			}
		}
	return(1);
	}

int ssl_cert_set0_chain(CERT *c, STACK_OF(X509) *chain)
	{
	CERT_PKEY *cpk = c->key;
	if (!cpk)
		return 0;
	if (cpk->chain)
		sk_X509_pop_free(cpk->chain, X509_free);
	cpk->chain = chain;
	return 1;
	}

int ssl_cert_set1_chain(CERT *c, STACK_OF(X509) *chain)
	{
	STACK_OF(X509) *dchain;
	if (!chain)
		return ssl_cert_set0_chain(c, NULL);
	dchain = X509_chain_up_ref(chain);
	if (!dchain)
		return 0;
	if (!ssl_cert_set0_chain(c, dchain))
		{
		sk_X509_pop_free(dchain, X509_free);
		return 0;
		}
	return 1;
	}

int ssl_cert_add0_chain_cert(CERT *c, X509 *x)
	{
	CERT_PKEY *cpk = c->key;
	if (!cpk)
		return 0;
	if (!cpk->chain)
		cpk->chain = sk_X509_new_null();
	if (!cpk->chain || !sk_X509_push(cpk->chain, x))
		return 0;
	return 1;
	}

int ssl_cert_add1_chain_cert(CERT *c, X509 *x)
	{
	if (!ssl_cert_add0_chain_cert(c, x))
		return 0;
	X509_up_ref(x);
	return 1;
	}

int ssl_cert_select_current(CERT *c, X509 *x)
	{
	int i;
	if (x == NULL)
		return 0;
	for (i = 0; i < SSL_PKEY_NUM; i++)
		{
		if (c->pkeys[i].x509 == x)
			{
			c->key = &c->pkeys[i];
			return 1;
			}
		}

	for (i = 0; i < SSL_PKEY_NUM; i++)
		{
		if (c->pkeys[i].x509 && !X509_cmp(c->pkeys[i].x509, x))
			{
			c->key = &c->pkeys[i];
			return 1;
			}
		}
	return 0;
	}

void ssl_cert_set_cert_cb(CERT *c, int (*cb)(SSL *ssl, void *arg), void *arg)
	{
	c->cert_cb = cb;
	c->cert_cb_arg = arg;
	}

SESS_CERT *ssl_sess_cert_new(void)
	{
	SESS_CERT *ret;

	ret = OPENSSL_malloc(sizeof *ret);
	if (ret == NULL)
		{
		OPENSSL_PUT_ERROR(SSL, ssl_sess_cert_new, ERR_R_MALLOC_FAILURE);
		return NULL;
		}

	memset(ret, 0 ,sizeof *ret);
	ret->peer_key = &(ret->peer_pkeys[SSL_PKEY_RSA_ENC]);

	return ret;
	}

void ssl_sess_cert_free(SESS_CERT *sc)
	{
	int i;

	if (sc == NULL)
		return;

	if (sc->cert_chain != NULL)
		sk_X509_pop_free(sc->cert_chain, X509_free);
	for (i = 0; i < SSL_PKEY_NUM; i++)
		{
		if (sc->peer_pkeys[i].x509 != NULL)
			X509_free(sc->peer_pkeys[i].x509);
#if 0 /* We don't have the peer's private key.  These lines are just
	   * here as a reminder that we're still using a not-quite-appropriate
	   * data structure. */
		if (sc->peer_pkeys[i].privatekey != NULL)
			EVP_PKEY_free(sc->peer_pkeys[i].privatekey);
#endif
		}

	if (sc->peer_dh_tmp != NULL)
		DH_free(sc->peer_dh_tmp);
	if (sc->peer_ecdh_tmp != NULL)
		EC_KEY_free(sc->peer_ecdh_tmp);

	OPENSSL_free(sc);
	}

int ssl_set_peer_cert_type(SESS_CERT *sc,int type)
	{
	sc->peer_cert_type = type;
	return(1);
	}

int ssl_verify_cert_chain(SSL *s,STACK_OF(X509) *sk)
	{
	X509 *x;
	int i;
	X509_STORE *verify_store;
	X509_STORE_CTX ctx;

	if (s->cert->verify_store)
		verify_store = s->cert->verify_store;
	else
		verify_store = s->ctx->cert_store;

	if ((sk == NULL) || (sk_X509_num(sk) == 0))
		return(0);

	x=sk_X509_value(sk,0);
	if(!X509_STORE_CTX_init(&ctx,verify_store,x,sk))
		{
		OPENSSL_PUT_ERROR(SSL, ssl_verify_cert_chain, ERR_R_X509_LIB);
		return(0);
		}
#if 0
	if (SSL_get_verify_depth(s) >= 0)
		X509_STORE_CTX_set_depth(&ctx, SSL_get_verify_depth(s));
#endif
	X509_STORE_CTX_set_ex_data(&ctx,SSL_get_ex_data_X509_STORE_CTX_idx(),s);

	/* We need to inherit the verify parameters. These can be determined by
	 * the context: if its a server it will verify SSL client certificates
	 * or vice versa.
	 */

	X509_STORE_CTX_set_default(&ctx,
				s->server ? "ssl_client" : "ssl_server");
	/* Anything non-default in "param" should overwrite anything in the
	 * ctx.
	 */
	X509_VERIFY_PARAM_set1(X509_STORE_CTX_get0_param(&ctx), s->param);

	if (s->verify_callback)
		X509_STORE_CTX_set_verify_cb(&ctx, s->verify_callback);

	if (s->ctx->app_verify_callback != NULL)
#if 1 /* new with OpenSSL 0.9.7 */
		i=s->ctx->app_verify_callback(&ctx, s->ctx->app_verify_arg); 
#else
		i=s->ctx->app_verify_callback(&ctx); /* should pass app_verify_arg */
#endif
	else
		{
#ifndef OPENSSL_NO_X509_VERIFY
		i=X509_verify_cert(&ctx);
#else
		i=0;
		ctx.error=X509_V_ERR_APPLICATION_VERIFICATION;
		OPENSSL_PUT_ERROR(SSL, ssl_verify_cert_chain, SSL_R_NO_VERIFY_CALLBACK);
#endif
		}

	s->verify_result=ctx.error;
	X509_STORE_CTX_cleanup(&ctx);

	return(i);
	}

static void set_client_CA_list(STACK_OF(X509_NAME) **ca_list,STACK_OF(X509_NAME) *name_list)
	{
	if (*ca_list != NULL)
		sk_X509_NAME_pop_free(*ca_list,X509_NAME_free);

	*ca_list=name_list;
	}

STACK_OF(X509_NAME) *SSL_dup_CA_list(STACK_OF(X509_NAME) *sk)
	{
	size_t i;
	STACK_OF(X509_NAME) *ret;
	X509_NAME *name;

	ret=sk_X509_NAME_new_null();
	for (i=0; i<sk_X509_NAME_num(sk); i++)
		{
		name=X509_NAME_dup(sk_X509_NAME_value(sk,i));
		if ((name == NULL) || !sk_X509_NAME_push(ret,name))
			{
			sk_X509_NAME_pop_free(ret,X509_NAME_free);
			return(NULL);
			}
		}
	return(ret);
	}

void SSL_set_client_CA_list(SSL *s,STACK_OF(X509_NAME) *name_list)
	{
	set_client_CA_list(&(s->client_CA),name_list);
	}

void SSL_CTX_set_client_CA_list(SSL_CTX *ctx,STACK_OF(X509_NAME) *name_list)
	{
	set_client_CA_list(&(ctx->client_CA),name_list);
	}

STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
	{
	return(ctx->client_CA);
	}

STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
	{
	if (s->server)
		{
		if (s->client_CA != NULL)
			return(s->client_CA);
		else
			return(s->ctx->client_CA);
		}
	else
		{
		if (((s->version>>8) == SSL3_VERSION_MAJOR) &&
			(s->s3 != NULL))
			return(s->s3->tmp.ca_names);
		else
			return(NULL);
		}
	}

static int add_client_CA(STACK_OF(X509_NAME) **sk,X509 *x)
	{
	X509_NAME *name;

	if (x == NULL) return(0);
	if ((*sk == NULL) && ((*sk=sk_X509_NAME_new_null()) == NULL))
		return(0);
		
	if ((name=X509_NAME_dup(X509_get_subject_name(x))) == NULL)
		return(0);

	if (!sk_X509_NAME_push(*sk,name))
		{
		X509_NAME_free(name);
		return(0);
		}
	return(1);
	}

int SSL_add_client_CA(SSL *ssl,X509 *x)
	{
	return(add_client_CA(&(ssl->client_CA),x));
	}

int SSL_CTX_add_client_CA(SSL_CTX *ctx,X509 *x)
	{
	return(add_client_CA(&(ctx->client_CA),x));
	}

static int xname_cmp(const X509_NAME **a, const X509_NAME **b)
	{
	return(X509_NAME_cmp(*a,*b));
	}

#ifndef OPENSSL_NO_STDIO
/*!
 * Load CA certs from a file into a ::STACK. Note that it is somewhat misnamed;
 * it doesn't really have anything to do with clients (except that a common use
 * for a stack of CAs is to send it to the client). Actually, it doesn't have
 * much to do with CAs, either, since it will load any old cert.
 * \param file the file containing one or more certs.
 * \return a ::STACK containing the certs.
 */
STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
	{
	BIO *in;
	X509 *x=NULL;
	X509_NAME *xn=NULL;
	STACK_OF(X509_NAME) *ret = NULL,*sk;

	sk=sk_X509_NAME_new(xname_cmp);

	in=BIO_new(BIO_s_file());

	if ((sk == NULL) || (in == NULL))
		{
		OPENSSL_PUT_ERROR(SSL, SSL_load_client_CA_file, ERR_R_MALLOC_FAILURE);
		goto err;
		}
	
	if (!BIO_read_filename(in,file))
		goto err;

	for (;;)
		{
		if (PEM_read_bio_X509(in,&x,NULL,NULL) == NULL)
			break;
		if (ret == NULL)
			{
			ret = sk_X509_NAME_new_null();
			if (ret == NULL)
				{
				OPENSSL_PUT_ERROR(SSL, SSL_load_client_CA_file, ERR_R_MALLOC_FAILURE);
				goto err;
				}
			}
		if ((xn=X509_get_subject_name(x)) == NULL) goto err;
		/* check for duplicates */
		xn=X509_NAME_dup(xn);
		if (xn == NULL) goto err;
		if (sk_X509_NAME_find(sk, NULL, xn))
			X509_NAME_free(xn);
		else
			{
			sk_X509_NAME_push(sk,xn);
			sk_X509_NAME_push(ret,xn);
			}
		}

	if (0)
		{
err:
		if (ret != NULL) sk_X509_NAME_pop_free(ret,X509_NAME_free);
		ret=NULL;
		}
	if (sk != NULL) sk_X509_NAME_free(sk);
	if (in != NULL) BIO_free(in);
	if (x != NULL) X509_free(x);
	if (ret != NULL)
		ERR_clear_error();
	return(ret);
	}
#endif

/*!
 * Add a file of certs to a stack.
 * \param stack the stack to add to.
 * \param file the file to add from. All certs in this file that are not
 * already in the stack will be added.
 * \return 1 for success, 0 for failure. Note that in the case of failure some
 * certs may have been added to \c stack.
 */

int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
					const char *file)
	{
	BIO *in;
	X509 *x=NULL;
	X509_NAME *xn=NULL;
	int ret=1;
	int (*oldcmp)(const X509_NAME **a, const X509_NAME **b);
	
	oldcmp=sk_X509_NAME_set_cmp_func(stack,xname_cmp);
	
	in=BIO_new(BIO_s_file());
	
	if (in == NULL)
		{
		OPENSSL_PUT_ERROR(SSL, SSL_add_file_cert_subjects_to_stack, ERR_R_MALLOC_FAILURE);
		goto err;
		}
	
	if (!BIO_read_filename(in,file))
		goto err;
	
	for (;;)
		{
		if (PEM_read_bio_X509(in,&x,NULL,NULL) == NULL)
			break;
		if ((xn=X509_get_subject_name(x)) == NULL) goto err;
		xn=X509_NAME_dup(xn);
		if (xn == NULL) goto err;
		if (sk_X509_NAME_find(stack, NULL, xn))
			X509_NAME_free(xn);
		else
			sk_X509_NAME_push(stack,xn);
		}

	ERR_clear_error();

	if (0)
		{
err:
		ret=0;
		}
	if(in != NULL)
		BIO_free(in);
	if(x != NULL)
		X509_free(x);
	
	(void)sk_X509_NAME_set_cmp_func(stack,oldcmp);

	return ret;
	}

/*!
 * Add a directory of certs to a stack.
 * \param stack the stack to append to.
 * \param dir the directory to append from. All files in this directory will be
 * examined as potential certs. Any that are acceptable to
 * SSL_add_dir_cert_subjects_to_stack() that are not already in the stack will be
 * included.
 * \return 1 for success, 0 for failure. Note that in the case of failure some
 * certs may have been added to \c stack.
 */

int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
				       const char *dir)
	{
	OPENSSL_DIR_CTX *d = NULL;
	const char *filename;
	int ret = 0;

	CRYPTO_w_lock(CRYPTO_LOCK_READDIR);

	/* Note that a side effect is that the CAs will be sorted by name */

	while((filename = OPENSSL_DIR_read(&d, dir)))
		{
		char buf[1024];
		int r;

		if(strlen(dir)+strlen(filename)+2 > sizeof buf)
			{
			OPENSSL_PUT_ERROR(SSL, SSL_add_dir_cert_subjects_to_stack, SSL_R_PATH_TOO_LONG);
			goto err;
			}

#ifdef OPENSSL_SYS_VMS
		r = BIO_snprintf(buf,sizeof buf,"%s%s",dir,filename);
#else
		r = BIO_snprintf(buf,sizeof buf,"%s/%s",dir,filename);
#endif
		if (r <= 0 || r >= (int)sizeof(buf))
			goto err;
		if(!SSL_add_file_cert_subjects_to_stack(stack,buf))
			goto err;
		}

	if (errno)
		{
		OPENSSL_PUT_ERROR(SSL, SSL_add_file_cert_subjects_to_stack, ERR_R_SYS_LIB);
		ERR_add_error_data(3, "OPENSSL_DIR_read(&ctx, '", dir, "')");
		goto err;
		}

	ret = 1;

err:
	if (d) OPENSSL_DIR_end(&d);
	CRYPTO_w_unlock(CRYPTO_LOCK_READDIR);
	return ret;
	}

/* Add a certificate to a BUF_MEM structure */

static int ssl_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
	{
	int n;
	unsigned char *p;

	n=i2d_X509(x,NULL);
	if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3)))
		{
		OPENSSL_PUT_ERROR(SSL, ssl_add_cert_to_buf, ERR_R_BUF_LIB);
		return 0;
		}
	p=(unsigned char *)&(buf->data[*l]);
	l2n3(n,p);
	i2d_X509(x,&p);
	*l+=n+3;

	return 1;
	}

/* Add certificate chain to internal SSL BUF_MEM structure. */
int ssl_add_cert_chain(SSL *s, CERT_PKEY *cpk, unsigned long *l)
	{
	BUF_MEM *buf = s->init_buf;
	int no_chain;
	size_t i;

	X509 *x;
	STACK_OF(X509) *extra_certs;
	X509_STORE *chain_store;

	if (cpk)
		x = cpk->x509;
	else
		x = NULL;

	if (s->cert->chain_store)
		chain_store = s->cert->chain_store;
	else
		chain_store = s->ctx->cert_store;

	/* If we have a certificate specific chain use it, else use
	 * parent ctx.
	 */
	if (cpk && cpk->chain)
		extra_certs = cpk->chain;
	else
		extra_certs = s->ctx->extra_certs;

	if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || extra_certs)
		no_chain = 1;
	else
		no_chain = 0;

	/* TLSv1 sends a chain with nothing in it, instead of an alert */
	if (!BUF_MEM_grow_clean(buf,10))
		{
		OPENSSL_PUT_ERROR(SSL, ssl_add_cert_chain, ERR_R_BUF_LIB);
		return 0;
		}
	if (x != NULL)
		{
		if (no_chain)
			{
			if (!ssl_add_cert_to_buf(buf, l, x))
				return 0;
			}
		else
			{
			X509_STORE_CTX xs_ctx;

			if (!X509_STORE_CTX_init(&xs_ctx,chain_store,x,NULL))
				{
				OPENSSL_PUT_ERROR(SSL, ssl_add_cert_chain, ERR_R_X509_LIB);
				return(0);
				}
			X509_verify_cert(&xs_ctx);
			/* Don't leave errors in the queue */
			ERR_clear_error();
			for (i=0; i < sk_X509_num(xs_ctx.chain); i++)
				{
				x = sk_X509_value(xs_ctx.chain, i);

				if (!ssl_add_cert_to_buf(buf, l, x))
					{
					X509_STORE_CTX_cleanup(&xs_ctx);
					return 0;
					}
				}
			X509_STORE_CTX_cleanup(&xs_ctx);
			}
		}
	for (i=0; i<sk_X509_num(extra_certs); i++)
		{
		x=sk_X509_value(extra_certs,i);
		if (!ssl_add_cert_to_buf(buf, l, x))
			return 0;
		}

	return 1;
	}

/* Build a certificate chain for current certificate */
int ssl_build_cert_chain(CERT *c, X509_STORE *chain_store, int flags)
	{
	CERT_PKEY *cpk = c->key;
	X509_STORE_CTX xs_ctx;
	STACK_OF(X509) *chain = NULL, *untrusted = NULL;
	X509 *x;
	int i, rv = 0;
	unsigned long error;

	if (!cpk->x509)
		{
		OPENSSL_PUT_ERROR(SSL, ssl_build_cert_chain, SSL_R_NO_CERTIFICATE_SET);
		goto err;
		}
	/* Rearranging and check the chain: add everything to a store */
	if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
		{
		size_t j;
		chain_store = X509_STORE_new();
		if (!chain_store)
			goto err;
		for (j = 0; j < sk_X509_num(cpk->chain); j++)
			{
			x = sk_X509_value(cpk->chain, j);
			if (!X509_STORE_add_cert(chain_store, x))
				{
				error = ERR_peek_last_error();
				if (ERR_GET_LIB(error) != ERR_LIB_X509 ||
				    ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE)
					goto err;
				ERR_clear_error();
				}
			}
		/* Add EE cert too: it might be self signed */
		if (!X509_STORE_add_cert(chain_store, cpk->x509))
			{
			error = ERR_peek_last_error();
			if (ERR_GET_LIB(error) != ERR_LIB_X509 ||
			    ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE)
				goto err;
			ERR_clear_error();
			}
		}
	else
		{
		if (c->chain_store)
			chain_store = c->chain_store;

		if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
			untrusted = cpk->chain;
		}

	if (!X509_STORE_CTX_init(&xs_ctx, chain_store, cpk->x509, untrusted))
		{
		OPENSSL_PUT_ERROR(SSL, ssl_build_cert_chain, ERR_R_X509_LIB);
		goto err;
		}

	i = X509_verify_cert(&xs_ctx);
	if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR)
		{
		if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
			ERR_clear_error();
		i = 1;
		rv = 2;
		}
	if (i > 0)
		chain = X509_STORE_CTX_get1_chain(&xs_ctx);
	if (i <= 0)
		{
		OPENSSL_PUT_ERROR(SSL, ssl_build_cert_chain, SSL_R_CERTIFICATE_VERIFY_FAILED);
		i = X509_STORE_CTX_get_error(&xs_ctx);
		ERR_add_error_data(2, "Verify error:",
					X509_verify_cert_error_string(i));

		X509_STORE_CTX_cleanup(&xs_ctx);
		goto err;
		}
	X509_STORE_CTX_cleanup(&xs_ctx);
	if (cpk->chain)
		sk_X509_pop_free(cpk->chain, X509_free);
	/* Remove EE certificate from chain */
	x = sk_X509_shift(chain);
	X509_free(x);
	if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT)
		{
		if (sk_X509_num(chain) > 0)
			{
			/* See if last cert is self signed */
			x = sk_X509_value(chain, sk_X509_num(chain) - 1);
			X509_check_purpose(x, -1, 0);
			if (x->ex_flags & EXFLAG_SS)
				{
				x = sk_X509_pop(chain);
				X509_free(x);
				}
			}
		}
	cpk->chain = chain;
	if (rv == 0)
		rv = 1;
	err:
	if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
		X509_STORE_free(chain_store);

	return rv;
	}

int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
	{
	X509_STORE **pstore;
	if (chain)
		pstore = &c->chain_store;
	else
		pstore = &c->verify_store;
	if (*pstore)
		X509_STORE_free(*pstore);
	*pstore = store;
	if (ref && store)
		CRYPTO_add(&store->references, 1, CRYPTO_LOCK_X509_STORE);
	return 1;
	}