/* $OpenBSD: ssl_asn1.c,v 1.28 2014/07/11 09:24:44 beck Exp $ */
/* 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 2005 Nokia. All rights reserved.
 *
 * The portions of the attached software ("Contribution") is developed by
 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 * license.
 *
 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 * support (see RFC 4279) to OpenSSL.
 *
 * No patent licenses or other rights except those expressly stated in
 * the OpenSSL open source license shall be deemed granted or received
 * expressly, by implication, estoppel, or otherwise.
 *
 * No assurances are provided by Nokia that the Contribution does not
 * infringe the patent or other intellectual property rights of any third
 * party or that the license provides you with all the necessary rights
 * to make use of the Contribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 * OTHERWISE.
 */

#include <stdio.h>
#include <stdlib.h>
#include "ssl_locl.h"
#include <openssl/asn1_mac.h>
#include <openssl/objects.h>
#include <openssl/x509.h>

typedef struct ssl_session_asn1_st {
	ASN1_INTEGER version;
	ASN1_INTEGER ssl_version;
	ASN1_OCTET_STRING cipher;
	ASN1_OCTET_STRING comp_id;
	ASN1_OCTET_STRING master_key;
	ASN1_OCTET_STRING session_id;
	ASN1_OCTET_STRING session_id_context;
	ASN1_INTEGER time;
	ASN1_INTEGER timeout;
	ASN1_INTEGER verify_result;
	ASN1_OCTET_STRING tlsext_hostname;
	ASN1_INTEGER tlsext_tick_lifetime;
	ASN1_OCTET_STRING tlsext_tick;
} SSL_SESSION_ASN1;

int
i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp)
{
#define LSIZE2 (sizeof(long)*2)
	int v1 = 0, v2 = 0, v3 = 0, v4 = 0, v5 = 0;
	unsigned char buf[4], ibuf1[LSIZE2], ibuf2[LSIZE2];
	unsigned char ibuf3[LSIZE2], ibuf4[LSIZE2], ibuf5[LSIZE2];
	int v6 = 0, v9 = 0, v10 = 0;
	unsigned char ibuf6[LSIZE2];
	long l;
	SSL_SESSION_ASN1 a;
	M_ASN1_I2D_vars(in);

	if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
		return (0);

	/* Note that I cheat in the following 2 assignments.  I know
	 * that if the ASN1_INTEGER passed to ASN1_INTEGER_set
	 * is > sizeof(long)+1, the buffer will not be re-malloc()ed.
	 * This is a bit evil but makes things simple, no dynamic allocation
	 * to clean up :-) */
	a.version.length = LSIZE2;
	a.version.type = V_ASN1_INTEGER;
	a.version.data = ibuf1;
	ASN1_INTEGER_set(&(a.version), SSL_SESSION_ASN1_VERSION);

	a.ssl_version.length = LSIZE2;
	a.ssl_version.type = V_ASN1_INTEGER;
	a.ssl_version.data = ibuf2;
	ASN1_INTEGER_set(&(a.ssl_version), in->ssl_version);

	a.cipher.type = V_ASN1_OCTET_STRING;
	a.cipher.data = buf;

	if (in->cipher == NULL)
		l = in->cipher_id;
	else
		l = in->cipher->id;
	a.cipher.length = 2;
	buf[0] = ((unsigned char)(l >> 8L))&0xff;
	buf[1] = ((unsigned char)(l    ))&0xff;


	a.master_key.length = in->master_key_length;
	a.master_key.type = V_ASN1_OCTET_STRING;
	a.master_key.data = in->master_key;

	a.session_id.length = in->session_id_length;
	a.session_id.type = V_ASN1_OCTET_STRING;
	a.session_id.data = in->session_id;

	a.session_id_context.length = in->sid_ctx_length;
	a.session_id_context.type = V_ASN1_OCTET_STRING;
	a.session_id_context.data = in->sid_ctx;


	if (in->time != 0L) {
		a.time.length = LSIZE2;
		a.time.type = V_ASN1_INTEGER;
		a.time.data = ibuf3;
		ASN1_INTEGER_set(&(a.time), in->time);	/* XXX 2038 */
	}

	if (in->timeout != 0L) {
		a.timeout.length = LSIZE2;
		a.timeout.type = V_ASN1_INTEGER;
		a.timeout.data = ibuf4;
		ASN1_INTEGER_set(&(a.timeout), in->timeout);
	}

	if (in->verify_result != X509_V_OK) {
		a.verify_result.length = LSIZE2;
		a.verify_result.type = V_ASN1_INTEGER;
		a.verify_result.data = ibuf5;
		ASN1_INTEGER_set(&a.verify_result, in->verify_result);
	}

	if (in->tlsext_hostname) {
		a.tlsext_hostname.length = strlen(in->tlsext_hostname);
		a.tlsext_hostname.type = V_ASN1_OCTET_STRING;
		a.tlsext_hostname.data = (unsigned char *)in->tlsext_hostname;
	}
	if (in->tlsext_tick) {
		a.tlsext_tick.length = in->tlsext_ticklen;
		a.tlsext_tick.type = V_ASN1_OCTET_STRING;
		a.tlsext_tick.data = (unsigned char *)in->tlsext_tick;
	}
	if (in->tlsext_tick_lifetime_hint > 0) {
		a.tlsext_tick_lifetime.length = LSIZE2;
		a.tlsext_tick_lifetime.type = V_ASN1_INTEGER;
		a.tlsext_tick_lifetime.data = ibuf6;
		ASN1_INTEGER_set(&a.tlsext_tick_lifetime, in->tlsext_tick_lifetime_hint);
	}

	M_ASN1_I2D_len(&(a.version),		i2d_ASN1_INTEGER);
	M_ASN1_I2D_len(&(a.ssl_version),	i2d_ASN1_INTEGER);
	M_ASN1_I2D_len(&(a.cipher),		i2d_ASN1_OCTET_STRING);
	M_ASN1_I2D_len(&(a.session_id),		i2d_ASN1_OCTET_STRING);
	M_ASN1_I2D_len(&(a.master_key),		i2d_ASN1_OCTET_STRING);
	if (in->time != 0L)
		M_ASN1_I2D_len_EXP_opt(&(a.time), i2d_ASN1_INTEGER, 1, v1);
	if (in->timeout != 0L)
		M_ASN1_I2D_len_EXP_opt(&(a.timeout), i2d_ASN1_INTEGER, 2, v2);
	if (in->peer != NULL)
		M_ASN1_I2D_len_EXP_opt(in->peer, i2d_X509, 3, v3);
	M_ASN1_I2D_len_EXP_opt(&a.session_id_context, i2d_ASN1_OCTET_STRING, 4, v4);
	if (in->verify_result != X509_V_OK)
		M_ASN1_I2D_len_EXP_opt(&(a.verify_result), i2d_ASN1_INTEGER, 5, v5);

	if (in->tlsext_tick_lifetime_hint > 0)
		M_ASN1_I2D_len_EXP_opt(&a.tlsext_tick_lifetime, i2d_ASN1_INTEGER, 9, v9);
	if (in->tlsext_tick)
		M_ASN1_I2D_len_EXP_opt(&(a.tlsext_tick), i2d_ASN1_OCTET_STRING, 10, v10);
	if (in->tlsext_hostname)
		M_ASN1_I2D_len_EXP_opt(&(a.tlsext_hostname), i2d_ASN1_OCTET_STRING, 6, v6);

	M_ASN1_I2D_seq_total();

	M_ASN1_I2D_put(&(a.version),		i2d_ASN1_INTEGER);
	M_ASN1_I2D_put(&(a.ssl_version),	i2d_ASN1_INTEGER);
	M_ASN1_I2D_put(&(a.cipher),		i2d_ASN1_OCTET_STRING);
	M_ASN1_I2D_put(&(a.session_id),		i2d_ASN1_OCTET_STRING);
	M_ASN1_I2D_put(&(a.master_key),		i2d_ASN1_OCTET_STRING);
	if (in->time != 0L)
		M_ASN1_I2D_put_EXP_opt(&(a.time), i2d_ASN1_INTEGER, 1, v1);
	if (in->timeout != 0L)
		M_ASN1_I2D_put_EXP_opt(&(a.timeout), i2d_ASN1_INTEGER, 2, v2);
	if (in->peer != NULL)
		M_ASN1_I2D_put_EXP_opt(in->peer, i2d_X509, 3, v3);
	M_ASN1_I2D_put_EXP_opt(&a.session_id_context, i2d_ASN1_OCTET_STRING, 4,
	v4);
	if (in->verify_result != X509_V_OK)
		M_ASN1_I2D_put_EXP_opt(&a.verify_result, i2d_ASN1_INTEGER, 5, v5);
	if (in->tlsext_hostname)
		M_ASN1_I2D_put_EXP_opt(&(a.tlsext_hostname), i2d_ASN1_OCTET_STRING, 6, v6);
	if (in->tlsext_tick_lifetime_hint > 0)
		M_ASN1_I2D_put_EXP_opt(&a.tlsext_tick_lifetime, i2d_ASN1_INTEGER, 9, v9);
	if (in->tlsext_tick)
		M_ASN1_I2D_put_EXP_opt(&(a.tlsext_tick), i2d_ASN1_OCTET_STRING, 10, v10);
	M_ASN1_I2D_finish();
}

SSL_SESSION *
d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp, long length)
{
	int ssl_version = 0, i;
	long id;
	ASN1_INTEGER ai, *aip;
	ASN1_OCTET_STRING os, *osp;
	M_ASN1_D2I_vars(a, SSL_SESSION *, SSL_SESSION_new);

	aip = &ai;
	osp = &os;

	M_ASN1_D2I_Init();
	M_ASN1_D2I_start_sequence();

	ai.data = NULL;
	ai.length = 0;
	M_ASN1_D2I_get_x(ASN1_INTEGER, aip, d2i_ASN1_INTEGER);
	if (ai.data != NULL) {
		free(ai.data);
		ai.data = NULL;
		ai.length = 0;
	}

	/* we don't care about the version right now :-) */
	M_ASN1_D2I_get_x(ASN1_INTEGER, aip, d2i_ASN1_INTEGER);
	ssl_version = (int)ASN1_INTEGER_get(aip);
	ret->ssl_version = ssl_version;
	if (ai.data != NULL) {
		free(ai.data);
		ai.data = NULL;
		ai.length = 0;
	}

	os.data = NULL;
	os.length = 0;
	M_ASN1_D2I_get_x(ASN1_OCTET_STRING, osp, d2i_ASN1_OCTET_STRING);
	if ((ssl_version >> 8) >= SSL3_VERSION_MAJOR) {
		if (os.length != 2) {
			c.error = SSL_R_CIPHER_CODE_WRONG_LENGTH;
			c.line = __LINE__;
			goto err;
		}
		id = 0x03000000L|
		((unsigned long)os.data[0]<<8L)|
		(unsigned long)os.data[1];
	} else {
		c.error = SSL_R_UNKNOWN_SSL_VERSION;
		c.line = __LINE__;
		goto err;
	}

	ret->cipher = NULL;
	ret->cipher_id = id;

	M_ASN1_D2I_get_x(ASN1_OCTET_STRING, osp, d2i_ASN1_OCTET_STRING);
	i = SSL3_MAX_SSL_SESSION_ID_LENGTH;

	if (os.length > i)
		os.length = i;
	if (os.length > (int)sizeof(ret->session_id)) /* can't happen */
		os.length = sizeof(ret->session_id);

	ret->session_id_length = os.length;
	OPENSSL_assert(os.length <= (int)sizeof(ret->session_id));
	memcpy(ret->session_id, os.data, os.length);

	M_ASN1_D2I_get_x(ASN1_OCTET_STRING, osp, d2i_ASN1_OCTET_STRING);
	if (os.length > SSL_MAX_MASTER_KEY_LENGTH)
		ret->master_key_length = SSL_MAX_MASTER_KEY_LENGTH;
	else
		ret->master_key_length = os.length;
	memcpy(ret->master_key, os.data, ret->master_key_length);

	os.length = 0;


	ai.length = 0;
	M_ASN1_D2I_get_EXP_opt(aip, d2i_ASN1_INTEGER, 1);	/* XXX 2038 */
	if (ai.data != NULL) {
		ret->time = ASN1_INTEGER_get(aip);
		free(ai.data);
		ai.data = NULL;
		ai.length = 0;
	} else
		ret->time = time(NULL);

	ai.length = 0;
	M_ASN1_D2I_get_EXP_opt(aip, d2i_ASN1_INTEGER, 2);
	if (ai.data != NULL) {
		ret->timeout = ASN1_INTEGER_get(aip);
		free(ai.data);
		ai.data = NULL;
		ai.length = 0;
	} else
		ret->timeout = 3;

	if (ret->peer != NULL) {
		X509_free(ret->peer);
		ret->peer = NULL;
	}
	M_ASN1_D2I_get_EXP_opt(ret->peer, d2i_X509, 3);

	os.length = 0;
	os.data = NULL;
	M_ASN1_D2I_get_EXP_opt(osp, d2i_ASN1_OCTET_STRING, 4);

	if (os.data != NULL) {
		if (os.length > SSL_MAX_SID_CTX_LENGTH) {
			c.error = SSL_R_BAD_LENGTH;
			c.line = __LINE__;
			goto err;
		} else {
			ret->sid_ctx_length = os.length;
			memcpy(ret->sid_ctx, os.data, os.length);
		}
		free(os.data);
		os.data = NULL;
		os.length = 0;
	} else
		ret->sid_ctx_length = 0;

	ai.length = 0;
	M_ASN1_D2I_get_EXP_opt(aip, d2i_ASN1_INTEGER, 5);
	if (ai.data != NULL) {
		ret->verify_result = ASN1_INTEGER_get(aip);
		free(ai.data);
		ai.data = NULL;
		ai.length = 0;
	} else
		ret->verify_result = X509_V_OK;

	os.length = 0;
	os.data = NULL;
	M_ASN1_D2I_get_EXP_opt(osp, d2i_ASN1_OCTET_STRING, 6);
	if (os.data) {
		ret->tlsext_hostname = BUF_strndup((char *)os.data, os.length);
		free(os.data);
		os.data = NULL;
		os.length = 0;
	} else
		ret->tlsext_hostname = NULL;


	ai.length = 0;
	M_ASN1_D2I_get_EXP_opt(aip, d2i_ASN1_INTEGER, 9);
	if (ai.data != NULL) {
		ret->tlsext_tick_lifetime_hint = ASN1_INTEGER_get(aip);
		free(ai.data);
		ai.data = NULL;
		ai.length = 0;
	} else if (ret->tlsext_ticklen && ret->session_id_length)
	ret->tlsext_tick_lifetime_hint = -1;
	else
		ret->tlsext_tick_lifetime_hint = 0;
	os.length = 0;
	os.data = NULL;
	M_ASN1_D2I_get_EXP_opt(osp, d2i_ASN1_OCTET_STRING, 10);
	if (os.data) {
		ret->tlsext_tick = os.data;
		ret->tlsext_ticklen = os.length;
		os.data = NULL;
		os.length = 0;
	} else
		ret->tlsext_tick = NULL;


	M_ASN1_D2I_Finish(a, SSL_SESSION_free, SSL_F_D2I_SSL_SESSION);
}