/* ssl/t1_reneg.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) 1998-2009 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).

 *

 */

#include <stdio.h>

#include <openssl/objects.h>

#include "ssl_locl.h"

/* Add the client's renegotiation binding */

int ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len,

                                        int maxlen)

{

    if (p) {

        if ((s->s3->previous_client_finished_len + 1) > maxlen) {

            SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_RENEGOTIATE_EXT,

                   SSL_R_RENEGOTIATE_EXT_TOO_LONG);

            return 0;

        }

        /* Length byte */

        *p = s->s3->previous_client_finished_len;

        p++;

        memcpy(p, s->s3->previous_client_finished,

               s->s3->previous_client_finished_len);

#ifdef OPENSSL_RI_DEBUG

        fprintf(stderr, "%s RI extension sent by client\n",

                s->s3->previous_client_finished_len ? "Non-empty" : "Empty");

#endif

    }

    *len = s->s3->previous_client_finished_len + 1;

    return 1;

}

/*

 * Parse the client's renegotiation binding and abort if it's not right

 */

int ssl_parse_clienthello_renegotiate_ext(SSL *s, unsigned char *d, int len,

                                          int *al)

{

    int ilen;

    /* Parse the length byte */

    if (len < 1) {

        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,

               SSL_R_RENEGOTIATION_ENCODING_ERR);

        *al = SSL_AD_ILLEGAL_PARAMETER;

        return 0;

    }

    ilen = *d;

    d++;

    /* Consistency check */

    if ((ilen + 1) != len) {

        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,

               SSL_R_RENEGOTIATION_ENCODING_ERR);

        *al = SSL_AD_ILLEGAL_PARAMETER;

        return 0;

    }

    /* Check that the extension matches */

    if (ilen != s->s3->previous_client_finished_len) {

        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,

               SSL_R_RENEGOTIATION_MISMATCH);

        *al = SSL_AD_HANDSHAKE_FAILURE;

        return 0;

    }

    if (memcmp(d, s->s3->previous_client_finished,

               s->s3->previous_client_finished_len)) {

        SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,

               SSL_R_RENEGOTIATION_MISMATCH);

        *al = SSL_AD_HANDSHAKE_FAILURE;

        return 0;

    }

#ifdef OPENSSL_RI_DEBUG

    fprintf(stderr, "%s RI extension received by server\n",

            ilen ? "Non-empty" : "Empty");

#endif

    s->s3->send_connection_binding = 1;

    return 1;

}

/* Add the server's renegotiation binding */

int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,

                                        int maxlen)

{

    if (p) {

        if ((s->s3->previous_client_finished_len +

             s->s3->previous_server_finished_len + 1) > maxlen) {

            SSLerr(SSL_F_SSL_ADD_SERVERHELLO_RENEGOTIATE_EXT,

                   SSL_R_RENEGOTIATE_EXT_TOO_LONG);

            return 0;

        }

        /* Length byte */

        *p = s->s3->previous_client_finished_len +

            s->s3->previous_server_finished_len;

        p++;

        memcpy(p, s->s3->previous_client_finished,

               s->s3->previous_client_finished_len);

        p += s->s3->previous_client_finished_len;

        memcpy(p, s->s3->previous_server_finished,

               s->s3->previous_server_finished_len);

#ifdef OPENSSL_RI_DEBUG

        fprintf(stderr, "%s RI extension sent by server\n",

                s->s3->previous_client_finished_len ? "Non-empty" : "Empty");

#endif

    }

    *len = s->s3->previous_client_finished_len

        + s->s3->previous_server_finished_len + 1;

    return 1;

}

/*

 * Parse the server's renegotiation binding and abort if it's not right

 */

int ssl_parse_serverhello_renegotiate_ext(SSL *s, unsigned char *d, int len,

                                          int *al)

{

    int expected_len = s->s3->previous_client_finished_len

        + s->s3->previous_server_finished_len;

    int ilen;

    /* Check for logic errors */

    OPENSSL_assert(!expected_len || s->s3->previous_client_finished_len);

    OPENSSL_assert(!expected_len || s->s3->previous_server_finished_len);

    /* Parse the length byte */

    if (len < 1) {

        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,

               SSL_R_RENEGOTIATION_ENCODING_ERR);

        *al = SSL_AD_ILLEGAL_PARAMETER;

        return 0;

    }

    ilen = *d;

    d++;

    /* Consistency check */

    if (ilen + 1 != len) {

        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,

               SSL_R_RENEGOTIATION_ENCODING_ERR);

        *al = SSL_AD_ILLEGAL_PARAMETER;

        return 0;

    }

    /* Check that the extension matches */

    if (ilen != expected_len) {

        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,

               SSL_R_RENEGOTIATION_MISMATCH);

        *al = SSL_AD_HANDSHAKE_FAILURE;

        return 0;

    }

    if (memcmp(d, s->s3->previous_client_finished,

               s->s3->previous_client_finished_len)) {

        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,

               SSL_R_RENEGOTIATION_MISMATCH);

        *al = SSL_AD_HANDSHAKE_FAILURE;

        return 0;

    }

    d += s->s3->previous_client_finished_len;

    if (memcmp(d, s->s3->previous_server_finished,

               s->s3->previous_server_finished_len)) {

        SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,

               SSL_R_RENEGOTIATION_MISMATCH);

        *al = SSL_AD_ILLEGAL_PARAMETER;

        return 0;

    }

#ifdef OPENSSL_RI_DEBUG

    fprintf(stderr, "%s RI extension received by client\n",

            ilen ? "Non-empty" : "Empty");

#endif

    s->s3->send_connection_binding = 1;

    return 1;

}