/*! \file ssl/ssl_lib.c

 *  \brief Version independent SSL functions.

 */

/* 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) 1998-2001 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.

 */

/*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

#ifdef REF_CHECK

#  include <assert.h>

#endif

#include <stdio.h>

#include "ssl_locl.h"

#include "kssl_lcl.h"

#include <openssl/objects.h>

#include <openssl/lhash.h>

#include <openssl/x509v3.h>

#ifndef OPENSSL_NO_DH

#include <openssl/dh.h>

#endif

#ifdef EMULATOR

	#include "libssl_wsd.h"

#endif

const char *SSL_version_str=OPENSSL_VERSION_TEXT;

#ifdef EMULATOR

	GET_GLOBAL_VAR_FROM_TLS(ssl3_undef_enc_method,ssl_lib,SSL3_ENC_METHOD)

	#define ssl3_undef_enc_method (GET_WSD_VAR_NAME(ssl3_undef_enc_method,ssl_lib,g)())

#endif

#ifndef EMULATOR

SSL3_ENC_METHOD ssl3_undef_enc_method={

#else

const SSL3_ENC_METHOD temp_ssl3_undef_enc_method={

#endif

	/* evil casts, but these functions are only called if there's a library bug */

	(int (*)(SSL *,int))ssl_undefined_function,

	(int (*)(SSL *, unsigned char *, int))ssl_undefined_function,

	ssl_undefined_function,

	(int (*)(SSL *, unsigned char *, unsigned char *, int))ssl_undefined_function,

	(int (*)(SSL*, int))ssl_undefined_function,

	(int (*)(SSL *, EVP_MD_CTX *, EVP_MD_CTX *, const char*, int, unsigned char *))ssl_undefined_function,

	0,	/* finish_mac_length */

	(int (*)(SSL *, EVP_MD_CTX *, unsigned char *))ssl_undefined_function,

	NULL,	/* client_finished_label */

	0,	/* client_finished_label_len */

	NULL,	/* server_finished_label */

	0,	/* server_finished_label_len */

	(int (*)(int))ssl_undefined_function

	};

EXPORT_C int SSL_clear(SSL *s)

	{

	if (s->method == NULL)

		{

		SSLerr(SSL_F_SSL_CLEAR,SSL_R_NO_METHOD_SPECIFIED);

		return(0);

		}

	if (ssl_clear_bad_session(s))

		{

		SSL_SESSION_free(s->session);

		s->session=NULL;

		}

	s->error=0;

	s->hit=0;

	s->shutdown=0;

#if 0 /* Disabled since version 1.10 of this file (early return not

       * needed because SSL_clear is not called when doing renegotiation) */

	/* This is set if we are doing dynamic renegotiation so keep

	 * the old cipher.  It is sort of a SSL_clear_lite :-) */

	if (s->new_session) return(1);

#else

	if (s->new_session)

		{

		SSLerr(SSL_F_SSL_CLEAR,ERR_R_INTERNAL_ERROR);

		return 0;

		}

#endif

	s->type=0;

	s->state=SSL_ST_BEFORE|((s->server)?SSL_ST_ACCEPT:SSL_ST_CONNECT);

	s->version=s->method->version;

	s->client_version=s->version;

	s->rwstate=SSL_NOTHING;

	s->rstate=SSL_ST_READ_HEADER;

#if 0

	s->read_ahead=s->ctx->read_ahead;

#endif

	if (s->init_buf != NULL)

		{

		BUF_MEM_free(s->init_buf);

		s->init_buf=NULL;

		}

	ssl_clear_cipher_ctx(s);

	s->first_packet=0;

#if 1

	/* Check to see if we were changed into a different method, if

	 * so, revert back if we are not doing session-id reuse. */

	if (!s->in_handshake && (s->session == NULL) && (s->method != s->ctx->method))

		{

		s->method->ssl_free(s);

		s->method=s->ctx->method;

		if (!s->method->ssl_new(s))

			return(0);

		}

	else

#endif

		s->method->ssl_clear(s);

	return(1);

	}

/** Used to change an SSL_CTXs default SSL method type */

EXPORT_C int SSL_CTX_set_ssl_version(SSL_CTX *ctx,SSL_METHOD *meth)

	{

	STACK_OF(SSL_CIPHER) *sk;

	ctx->method=meth;

	sk=ssl_create_cipher_list(ctx->method,&(ctx->cipher_list),

		&(ctx->cipher_list_by_id),SSL_DEFAULT_CIPHER_LIST);

	if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= 0))

		{

		SSLerr(SSL_F_SSL_CTX_SET_SSL_VERSION,SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);

		return(0);

		}

	return(1);

	}

EXPORT_C SSL *SSL_new(SSL_CTX *ctx)

	{

	SSL *s;

	if (ctx == NULL)

		{

		SSLerr(SSL_F_SSL_NEW,SSL_R_NULL_SSL_CTX);

		return(NULL);

		}

	if (ctx->method == NULL)

		{

		SSLerr(SSL_F_SSL_NEW,SSL_R_SSL_CTX_HAS_NO_DEFAULT_SSL_VERSION);

		return(NULL);

		}

	s=(SSL *)OPENSSL_malloc(sizeof(SSL));

	if (s == NULL) goto err;

	memset(s,0,sizeof(SSL));

#ifndef	OPENSSL_NO_KRB5

	s->kssl_ctx = kssl_ctx_new();

#endif	/* OPENSSL_NO_KRB5 */

	s->options=ctx->options;

	s->mode=ctx->mode;

	s->max_cert_list=ctx->max_cert_list;

	if (ctx->cert != NULL)

		{

		/* Earlier library versions used to copy the pointer to

		 * the CERT, not its contents; only when setting new

		 * parameters for the per-SSL copy, ssl_cert_new would be

		 * called (and the direct reference to the per-SSL_CTX

		 * settings would be lost, but those still were indirectly

		 * accessed for various purposes, and for that reason they

		 * used to be known as s->ctx->default_cert).

		 * Now we don't look at the SSL_CTX's CERT after having

		 * duplicated it once. */

		s->cert = ssl_cert_dup(ctx->cert);

		if (s->cert == NULL)

			goto err;

		}

	else

		s->cert=NULL; /* Cannot really happen (see SSL_CTX_new) */

	s->read_ahead=ctx->read_ahead;

	s->msg_callback=ctx->msg_callback;

	s->msg_callback_arg=ctx->msg_callback_arg;

	s->verify_mode=ctx->verify_mode;

#if 0

	s->verify_depth=ctx->verify_depth;

#endif

	s->sid_ctx_length=ctx->sid_ctx_length;

	OPENSSL_assert(s->sid_ctx_length <= sizeof s->sid_ctx);

	memcpy(&s->sid_ctx,&ctx->sid_ctx,sizeof(s->sid_ctx));

	s->verify_callback=ctx->default_verify_callback;

	s->generate_session_id=ctx->generate_session_id;

	s->param = X509_VERIFY_PARAM_new();

	if (!s->param)

		goto err;

	X509_VERIFY_PARAM_inherit(s->param, ctx->param);

#if 0

	s->purpose = ctx->purpose;

	s->trust = ctx->trust;

#endif

	s->quiet_shutdown=ctx->quiet_shutdown;

	CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);

	s->ctx=ctx;

	s->verify_result=X509_V_OK;

	s->method=ctx->method;

	if (!s->method->ssl_new(s))

		goto err;

	s->references=1;

	s->server=(ctx->method->ssl_accept == ssl_undefined_function)?0:1;

	SSL_clear(s);

	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data);

	return(s);

err:

	if (s != NULL)

		{

		if (s->cert != NULL)

			ssl_cert_free(s->cert);

		if (s->ctx != NULL)

			SSL_CTX_free(s->ctx); /* decrement reference count */

		OPENSSL_free(s);

		}

	SSLerr(SSL_F_SSL_NEW,ERR_R_MALLOC_FAILURE);

	return(NULL);

	}

EXPORT_C int SSL_CTX_set_session_id_context(SSL_CTX *ctx,const unsigned char *sid_ctx,

				   unsigned int sid_ctx_len)

    {

    if(sid_ctx_len > sizeof ctx->sid_ctx)

	{

	SSLerr(SSL_F_SSL_CTX_SET_SESSION_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);

	return 0;

	}

    ctx->sid_ctx_length=sid_ctx_len;

    memcpy(ctx->sid_ctx,sid_ctx,sid_ctx_len);

    return 1;

    }

EXPORT_C int SSL_set_session_id_context(SSL *ssl,const unsigned char *sid_ctx,

			       unsigned int sid_ctx_len)

    {

    if(sid_ctx_len > SSL_MAX_SID_CTX_LENGTH)

	{

	SSLerr(SSL_F_SSL_SET_SESSION_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);

	return 0;

	}

    ssl->sid_ctx_length=sid_ctx_len;

    memcpy(ssl->sid_ctx,sid_ctx,sid_ctx_len);

    return 1;

    }

EXPORT_C int SSL_CTX_set_generate_session_id(SSL_CTX *ctx, GEN_SESSION_CB cb)

	{

	CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);

	ctx->generate_session_id = cb;

	CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);

	return 1;

	}

EXPORT_C int SSL_set_generate_session_id(SSL *ssl, GEN_SESSION_CB cb)

	{

	CRYPTO_w_lock(CRYPTO_LOCK_SSL);

	ssl->generate_session_id = cb;

	CRYPTO_w_unlock(CRYPTO_LOCK_SSL);

	return 1;

	}

EXPORT_C int SSL_has_matching_session_id(const SSL *ssl, const unsigned char *id,

				unsigned int id_len)

	{

	/* A quick examination of SSL_SESSION_hash and SSL_SESSION_cmp shows how

	 * we can "construct" a session to give us the desired check - ie. to

	 * find if there's a session in the hash table that would conflict with

	 * any new session built out of this id/id_len and the ssl_version in

	 * use by this SSL. */

	SSL_SESSION r, *p;

	if(id_len > sizeof r.session_id)

		return 0;

	r.ssl_version = ssl->version;

	r.session_id_length = id_len;

	memcpy(r.session_id, id, id_len);

	/* NB: SSLv2 always uses a fixed 16-byte session ID, so even if a

	 * callback is calling us to check the uniqueness of a shorter ID, it

	 * must be compared as a padded-out ID because that is what it will be

	 * converted to when the callback has finished choosing it. */

	if((r.ssl_version == SSL2_VERSION) &&

			(id_len < SSL2_SSL_SESSION_ID_LENGTH))

		{

		memset(r.session_id + id_len, 0,

			SSL2_SSL_SESSION_ID_LENGTH - id_len);

		r.session_id_length = SSL2_SSL_SESSION_ID_LENGTH;

		}

	CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);

	p = (SSL_SESSION *)lh_retrieve(ssl->ctx->sessions, &r);

	CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);

	return (p != NULL);

	}

EXPORT_C int SSL_CTX_set_purpose(SSL_CTX *s, int purpose)

	{

	return X509_VERIFY_PARAM_set_purpose(s->param, purpose);

	}

EXPORT_C int SSL_set_purpose(SSL *s, int purpose)

	{

	return X509_VERIFY_PARAM_set_purpose(s->param, purpose);

	}

EXPORT_C int SSL_CTX_set_trust(SSL_CTX *s, int trust)

	{

	return X509_VERIFY_PARAM_set_trust(s->param, trust);

	}

EXPORT_C int SSL_set_trust(SSL *s, int trust)

	{

	return X509_VERIFY_PARAM_set_trust(s->param, trust);

	}

EXPORT_C void SSL_free(SSL *s)

	{

	int i;

	if(s == NULL)

	    return;

	i=CRYPTO_add(&s->references,-1,CRYPTO_LOCK_SSL);

#ifdef REF_PRINT

	REF_PRINT("SSL",s);

#endif

	if (i > 0) return;

#ifdef REF_CHECK

	if (i < 0)

		{

		fprintf(stderr,"SSL_free, bad reference count\n");

		abort(); /* ok */

		}

#endif

	if (s->param)

		X509_VERIFY_PARAM_free(s->param);

	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data);

	if (s->bbio != NULL)

		{

		/* If the buffering BIO is in place, pop it off */

		if (s->bbio == s->wbio)

			{

			s->wbio=BIO_pop(s->wbio);

			}

		BIO_free(s->bbio);

		s->bbio=NULL;

		}

	if (s->rbio != NULL)

		BIO_free_all(s->rbio);

	if ((s->wbio != NULL) && (s->wbio != s->rbio))

		BIO_free_all(s->wbio);

	if (s->init_buf != NULL) BUF_MEM_free(s->init_buf);

	/* add extra stuff */

	if (s->cipher_list != NULL) sk_SSL_CIPHER_free(s->cipher_list);

	if (s->cipher_list_by_id != NULL) sk_SSL_CIPHER_free(s->cipher_list_by_id);

	/* Make the next call work :-) */

	if (s->session != NULL)

		{

		ssl_clear_bad_session(s);

		SSL_SESSION_free(s->session);

		}

	ssl_clear_cipher_ctx(s);

	if (s->cert != NULL) ssl_cert_free(s->cert);

	/* Free up if allocated */

	if (s->ctx) SSL_CTX_free(s->ctx);

	if (s->client_CA != NULL)

		sk_X509_NAME_pop_free(s->client_CA,X509_NAME_free);

	if (s->method != NULL) s->method->ssl_free(s);

#ifndef	OPENSSL_NO_KRB5

	if (s->kssl_ctx != NULL)

		kssl_ctx_free(s->kssl_ctx);

#endif	/* OPENSSL_NO_KRB5 */

	OPENSSL_free(s);

	}

EXPORT_C void SSL_set_bio(SSL *s,BIO *rbio,BIO *wbio)

	{

	/* If the output buffering BIO is still in place, remove it

	 */