/* ssl/s23_clnt.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) 1998-2006 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 "ssl_locl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>

static const SSL_METHOD *ssl23_get_client_method(int ver);
static int ssl23_client_hello(SSL *s);
static int ssl23_get_server_hello(SSL *s);
static const SSL_METHOD *ssl23_get_client_method(int ver)
{
#ifndef OPENSSL_NO_SSL3
    if (ver == SSL3_VERSION)
        return (SSLv3_client_method());
#endif
    if (ver == TLS1_VERSION)
        return (TLSv1_client_method());
    else if (ver == TLS1_1_VERSION)
        return (TLSv1_1_client_method());
    else if (ver == TLS1_2_VERSION)
        return (TLSv1_2_client_method());
    else
        return (NULL);
}

IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
                          ssl_undefined_function,
                          ssl23_connect, ssl23_get_client_method)

int ssl23_connect(SSL *s)
{
    BUF_MEM *buf = NULL;
    unsigned long Time = (unsigned long)time(NULL);
    void (*cb) (const SSL *ssl, int type, int val) = NULL;
    int ret = -1;
    int new_state, state;

    RAND_add(&Time, sizeof(Time), 0);
    ERR_clear_error();
    clear_sys_error();

    if (s->info_callback != NULL)
        cb = s->info_callback;
    else if (s->ctx->info_callback != NULL)
        cb = s->ctx->info_callback;

    s->in_handshake++;
    if (!SSL_in_init(s) || SSL_in_before(s)) {
        if (!SSL_clear(s))
            return -1;
    }

    for (;;) {
        state = s->state;

        switch (s->state) {
        case SSL_ST_BEFORE:
        case SSL_ST_CONNECT:
        case SSL_ST_BEFORE | SSL_ST_CONNECT:
        case SSL_ST_OK | SSL_ST_CONNECT:

            if (s->session != NULL) {
                SSLerr(SSL_F_SSL23_CONNECT,
                       SSL_R_SSL23_DOING_SESSION_ID_REUSE);
                ret = -1;
                goto end;
            }
            s->server = 0;
            if (cb != NULL)
                cb(s, SSL_CB_HANDSHAKE_START, 1);

            /* s->version=TLS1_VERSION; */
            s->type = SSL_ST_CONNECT;

            if (s->init_buf == NULL) {
                if ((buf = BUF_MEM_new()) == NULL) {
                    ret = -1;
                    goto end;
                }
                if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
                    ret = -1;
                    goto end;
                }
                s->init_buf = buf;
                buf = NULL;
            }

            if (!ssl3_setup_buffers(s)) {
                ret = -1;
                goto end;
            }

            ssl3_init_finished_mac(s);

            s->state = SSL23_ST_CW_CLNT_HELLO_A;
            s->ctx->stats.sess_connect++;
            s->init_num = 0;
            break;

        case SSL23_ST_CW_CLNT_HELLO_A:
        case SSL23_ST_CW_CLNT_HELLO_B:

            s->shutdown = 0;
            ret = ssl23_client_hello(s);
            if (ret <= 0)
                goto end;
            s->state = SSL23_ST_CR_SRVR_HELLO_A;
            s->init_num = 0;

            break;

        case SSL23_ST_CR_SRVR_HELLO_A:
        case SSL23_ST_CR_SRVR_HELLO_B:
            ret = ssl23_get_server_hello(s);
            if (ret >= 0)
                cb = NULL;
            goto end;
            /* break; */

        default:
            SSLerr(SSL_F_SSL23_CONNECT, SSL_R_UNKNOWN_STATE);
            ret = -1;
            goto end;
            /* break; */
        }

        if (s->debug) {
            (void)BIO_flush(s->wbio);
        }

        if ((cb != NULL) && (s->state != state)) {
            new_state = s->state;
            s->state = state;
            cb(s, SSL_CB_CONNECT_LOOP, 1);
            s->state = new_state;
        }
    }
 end:
    s->in_handshake--;
    if (buf != NULL)
        BUF_MEM_free(buf);
    if (cb != NULL)
        cb(s, SSL_CB_CONNECT_EXIT, ret);
    return (ret);
}

/*
 * Fill a ClientRandom or ServerRandom field of length len. Returns <= 0 on
 * failure, 1 on success.
 */
int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len)
{
    int send_time = 0;

    if (len < 4)
        return 0;
    if (server)
        send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
    else
        send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
    if (send_time) {
        unsigned long Time = (unsigned long)time(NULL);
        unsigned char *p = result;
        l2n(Time, p);
        return RAND_bytes(p, len - 4);
    } else
        return RAND_bytes(result, len);
}

static int ssl23_client_hello(SSL *s)
{
    unsigned char *buf;
    unsigned char *p, *d;
    int i;
    unsigned long l;
    int version = 0, version_major, version_minor;
    int al = 0;
#ifndef OPENSSL_NO_COMP
    int j;
    SSL_COMP *comp;
#endif
    int ret;
    unsigned long mask, options = s->options;

    /*
     * SSL_OP_NO_X disables all protocols above X *if* there are
     * some protocols below X enabled. This is required in order
     * to maintain "version capability" vector contiguous. So
     * that if application wants to disable TLS1.0 in favour of
     * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
     * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2.
     */
    mask = SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1
#if !defined(OPENSSL_NO_SSL3)
        | SSL_OP_NO_SSLv3
#endif
        ;
#if !defined(OPENSSL_NO_TLS1_2_CLIENT)
    version = TLS1_2_VERSION;

    if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask)
        version = TLS1_1_VERSION;
#else
    version = TLS1_1_VERSION;
#endif
    mask &= ~SSL_OP_NO_TLSv1_1;
    if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
        version = TLS1_VERSION;
    mask &= ~SSL_OP_NO_TLSv1;
#if !defined(OPENSSL_NO_SSL3)
    if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
        version = SSL3_VERSION;
    mask &= ~SSL_OP_NO_SSLv3;
#endif

    buf = (unsigned char *)s->init_buf->data;
    if (s->state == SSL23_ST_CW_CLNT_HELLO_A) {
        p = s->s3->client_random;
        if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
            return -1;

        if (version == TLS1_2_VERSION) {
            version_major = TLS1_2_VERSION_MAJOR;
            version_minor = TLS1_2_VERSION_MINOR;
        } else if (tls1_suiteb(s)) {
            SSLerr(SSL_F_SSL23_CLIENT_HELLO,
                   SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
            return -1;
        } else if (version == TLS1_1_VERSION) {
            version_major = TLS1_1_VERSION_MAJOR;
            version_minor = TLS1_1_VERSION_MINOR;
        } else if (version == TLS1_VERSION) {
            version_major = TLS1_VERSION_MAJOR;
            version_minor = TLS1_VERSION_MINOR;
        } else if (FIPS_mode()) {
            SSLerr(SSL_F_SSL23_CLIENT_HELLO,
                   SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
            return -1;
        } else if (version == SSL3_VERSION) {
            version_major = SSL3_VERSION_MAJOR;
            version_minor = SSL3_VERSION_MINOR;
        } else {
            SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_PROTOCOLS_AVAILABLE);
            return (-1);
        }

        s->client_version = version;

        /* create Client Hello in SSL 3.0/TLS 1.0 format */

        /*
         * do the record header (5 bytes) and handshake message header (4
         * bytes) last
         */
        d = p = &(buf[9]);

        *(p++) = version_major;
        *(p++) = version_minor;

        /* Random stuff */
        memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
        p += SSL3_RANDOM_SIZE;

        /* Session ID (zero since there is no reuse) */
        *(p++) = 0;

        /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
        i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]),
                                     ssl3_put_cipher_by_char);
        if (i == 0) {
            SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
            return -1;
        }
#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
        /*
         * Some servers hang if client hello > 256 bytes as hack workaround
         * chop number of supported ciphers to keep it well below this if we
         * use TLS v1.2
         */
        if (TLS1_get_version(s) >= TLS1_2_VERSION
            && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
            i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
#endif
        s2n(i, p);
        p += i;

        /* COMPRESSION */
#ifdef OPENSSL_NO_COMP
        *(p++) = 1;
#else
        if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
            j = 0;
        else
            j = sk_SSL_COMP_num(s->ctx->comp_methods);
        *(p++) = 1 + j;
        for (i = 0; i < j; i++) {
            comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
            *(p++) = comp->id;
        }
#endif
        *(p++) = 0;             /* Add the NULL method */

#ifndef OPENSSL_NO_TLSEXT
        /* TLS extensions */
        if (ssl_prepare_clienthello_tlsext(s) <= 0) {
            SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
            return -1;
        }
        if ((p =
             ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
                                        &al)) == NULL) {
            ssl3_send_alert(s, SSL3_AL_FATAL, al);
            SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
            return -1;
        }
#endif

        l = p - d;

        /* fill in 4-byte handshake header */
        d = &(buf[5]);
        *(d++) = SSL3_MT_CLIENT_HELLO;
        l2n3(l, d);

        l += 4;

        if (l > SSL3_RT_MAX_PLAIN_LENGTH) {
            SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
            return -1;
        }

        /* fill in 5-byte record header */
        d = buf;
        *(d++) = SSL3_RT_HANDSHAKE;
        *(d++) = version_major;
        /*
         * Some servers hang if we use long client hellos and a record number
         * > TLS 1.0.
         */
        if (TLS1_get_client_version(s) > TLS1_VERSION)
            *(d++) = 1;
        else
            *(d++) = version_minor;
        s2n((int)l, d);

        /* number of bytes to write */
        s->init_num = p - buf;
        s->init_off = 0;

        ssl3_finish_mac(s, &(buf[5]), s->init_num - 5);

        s->state = SSL23_ST_CW_CLNT_HELLO_B;
        s->init_off = 0;
    }

    /* SSL3_ST_CW_CLNT_HELLO_B */
    ret = ssl23_write_bytes(s);

    if ((ret >= 2) && s->msg_callback) {
        /* Client Hello has been sent; tell msg_callback */
        s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5, s,
                        s->msg_callback_arg);
        s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data + 5,
                        ret - 5, s, s->msg_callback_arg);
    }

    return ret;
}

static int ssl23_get_server_hello(SSL *s)
{
    unsigned char buf[8];
    unsigned char *p;
    int i;
    int n;

    n = ssl23_read_bytes(s, 7);

    if (n != 7)
        return (n);
    p = RECORD_LAYER_get_packet(&s->rlayer);

    memcpy(buf, p, n);

    if (p[1] == SSL3_VERSION_MAJOR &&
        p[2] <= TLS1_2_VERSION_MINOR &&
        ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
         (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) {
        /* we have sslv3 or tls1 (server hello or alert) */

#ifndef OPENSSL_NO_SSL3
        if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) {
            if (FIPS_mode()) {
                SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
                       SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
                goto err;
            }
            s->version = SSL3_VERSION;
            s->method = SSLv3_client_method();
        } else
#endif
        if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) {
            s->version = TLS1_VERSION;
            s->method = TLSv1_client_method();
        } else if ((p[2] == TLS1_1_VERSION_MINOR) &&
                   !(s->options & SSL_OP_NO_TLSv1_1)) {
            s->version = TLS1_1_VERSION;
            s->method = TLSv1_1_client_method();
        } else if ((p[2] == TLS1_2_VERSION_MINOR) &&
                   !(s->options & SSL_OP_NO_TLSv1_2)) {
            s->version = TLS1_2_VERSION;
            s->method = TLSv1_2_client_method();
        } else {
            SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
            goto err;
        }

        /* ensure that TLS_MAX_VERSION is up-to-date */
        OPENSSL_assert(s->version <= TLS_MAX_VERSION);

        if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
            SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_VERSION_TOO_LOW);
            goto err;
        }

        if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) {
            /* fatal alert */

            void (*cb) (const SSL *ssl, int type, int val) = NULL;
            int j;

            if (s->info_callback != NULL)
                cb = s->info_callback;
            else if (s->ctx->info_callback != NULL)
                cb = s->ctx->info_callback;

            i = p[5];
            if (cb != NULL) {
                j = (i << 8) | p[6];
                cb(s, SSL_CB_READ_ALERT, j);
            }

            if (s->msg_callback) {
                s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s,
                                s->msg_callback_arg);
                s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s,
                                s->msg_callback_arg);
            }

            s->rwstate = SSL_NOTHING;
            SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]);
            goto err;
        }

        if (!ssl_init_wbio_buffer(s, 1))
            goto err;

        /* we are in this state */
        s->state = SSL3_ST_CR_SRVR_HELLO_A;

        /*
         * put the 7 bytes we have read into the input buffer for SSLv3
         */
        if (!RECORD_LAYER_set_data(&s->rlayer, buf, n))
            goto err;

        s->handshake_func = s->method->ssl_connect;
    } else {
        SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL);
        goto err;
    }
    s->init_num = 0;

    /*
     * Since, if we are sending a ssl23 client hello, we are not reusing a
     * session-id
     */
    if (!ssl_get_new_session(s, 0))
        goto err;

    return (SSL_connect(s));
 err:
    return (-1);
}