PR: 2786

[mirror-openssl.git] / ssl / s2_clnt.c

/* ssl/s2_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) 1998-2001 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).
 *
 */

#include "ssl_locl.h"
#ifndef OPENSSL_NO_SSL2
#include <stdio.h>
#include <openssl/rand.h>
#include <openssl/buffer.h>
#include <openssl/objects.h>
#include <openssl/evp.h>

static const SSL_METHOD *ssl2_get_client_method(int ver);
static int get_server_finished(SSL *s);
static int get_server_verify(SSL *s);
static int get_server_hello(SSL *s);
static int client_hello(SSL *s); 
static int client_master_key(SSL *s);
static int client_finished(SSL *s);
static int client_certificate(SSL *s);
static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
        unsigned char *to,int padding);
#define BREAK   break

static const SSL_METHOD *ssl2_get_client_method(int ver)
        {
        if (ver == SSL2_VERSION)
                return(SSLv2_client_method());
        else
                return(NULL);
        }

IMPLEMENT_ssl2_meth_func(SSLv2_client_method,
                        ssl_undefined_function,
                        ssl2_connect,
                        ssl2_get_client_method)

int ssl2_connect(SSL *s)
        {
        unsigned long l=(unsigned long)time(NULL);
        BUF_MEM *buf=NULL;
        int ret= -1;
        void (*cb)(const SSL *ssl,int type,int val)=NULL;
        int new_state,state;

        RAND_add(&l,sizeof(l),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;

        /* init things to blank */
        s->in_handshake++;
        if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);

        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:

                        s->server=0;
                        if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);

                        s->version=SSL2_VERSION;
                        s->type=SSL_ST_CONNECT;

                        buf=s->init_buf;
                        if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
                                {
                                ret= -1;
                                goto end;
                                }
                        if (!BUF_MEM_grow(buf,
                                SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
                                {
                                if (buf == s->init_buf)
                                        buf=NULL;
                                ret= -1;
                                goto end;
                                }
                        s->init_buf=buf;
                        buf=NULL;
                        s->init_num=0;
                        s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
                        s->ctx->stats.sess_connect++;
                        s->handshake_func=ssl2_connect;
                        BREAK;

                case SSL2_ST_SEND_CLIENT_HELLO_A:
                case SSL2_ST_SEND_CLIENT_HELLO_B:
                        s->shutdown=0;
                        ret=client_hello(s);
                        if (ret <= 0) goto end;
                        s->init_num=0;
                        s->state=SSL2_ST_GET_SERVER_HELLO_A;
                        BREAK;
                
                case SSL2_ST_GET_SERVER_HELLO_A:
                case SSL2_ST_GET_SERVER_HELLO_B:
                        ret=get_server_hello(s);
                        if (ret <= 0) goto end;
                        s->init_num=0;
                        if (!s->hit) /* new session */
                                {
                                s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
                                BREAK; 
                                }
                        else
                                {
                                s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
                                break;
                                }
        
                case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
                case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
                        ret=client_master_key(s);
                        if (ret <= 0) goto end;
                        s->init_num=0;
                        s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
                        break;

                case SSL2_ST_CLIENT_START_ENCRYPTION:
                        /* Ok, we now have all the stuff needed to
                         * start encrypting, so lets fire it up :-) */
                        if (!ssl2_enc_init(s,1))
                                {
                                ret= -1;
                                goto end;
                                }
                        s->s2->clear_text=0;
                        s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
                        break;

                case SSL2_ST_SEND_CLIENT_FINISHED_A:
                case SSL2_ST_SEND_CLIENT_FINISHED_B:
                        ret=client_finished(s);
                        if (ret <= 0) goto end;
                        s->init_num=0;
                        s->state=SSL2_ST_GET_SERVER_VERIFY_A;
                        break;

                case SSL2_ST_GET_SERVER_VERIFY_A:
                case SSL2_ST_GET_SERVER_VERIFY_B:
                        ret=get_server_verify(s);
                        if (ret <= 0) goto end;
                        s->init_num=0;
                        s->state=SSL2_ST_GET_SERVER_FINISHED_A;
                        break;

                case SSL2_ST_GET_SERVER_FINISHED_A:
                case SSL2_ST_GET_SERVER_FINISHED_B:
                        ret=get_server_finished(s);
                        if (ret <= 0) goto end;
                        break;

                case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
                case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
                case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
                case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
                case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
                        ret=client_certificate(s);
                        if (ret <= 0) goto end;
                        s->init_num=0;
                        s->state=SSL2_ST_GET_SERVER_FINISHED_A;
                        break;

                case SSL_ST_OK:
                        if (s->init_buf != NULL)
                                {
                                BUF_MEM_free(s->init_buf);
                                s->init_buf=NULL;
                                }
                        s->init_num=0;
                /*      ERR_clear_error();*/

                        /* If we want to cache session-ids in the client
                         * and we successfully add the session-id to the
                         * cache, and there is a callback, then pass it out.
                         * 26/11/96 - eay - only add if not a re-used session.
                         */

                        ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
                        if (s->hit) s->ctx->stats.sess_hit++;

                        ret=1;
                        /* s->server=0; */
                        s->ctx->stats.sess_connect_good++;

                        if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);

                        goto end;
                        /* break; */
                default:
                        SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
                        return(-1);
                        /* break; */
                        }

                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);
        }

static int get_server_hello(SSL *s)
        {
        unsigned char *buf;
        unsigned char *p;
        int i,j;
        unsigned long len;
        STACK_OF(SSL_CIPHER) *sk=NULL,*cl, *prio, *allow;

        buf=(unsigned char *)s->init_buf->data;
        p=buf;
        if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
                {
                i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
                if (i < (11-s->init_num)) 
                        return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
                s->init_num = 11;

                if (*(p++) != SSL2_MT_SERVER_HELLO)
                        {
                        if (p[-1] != SSL2_MT_ERROR)
                                {
                                ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                                SSLerr(SSL_F_GET_SERVER_HELLO,
                                        SSL_R_READ_WRONG_PACKET_TYPE);
                                }
                        else
                                SSLerr(SSL_F_GET_SERVER_HELLO,
                                        SSL_R_PEER_ERROR);
                        return(-1);
                        }
#if 0
                s->hit=(*(p++))?1:0;
                /* Some [PPC?] compilers fail to increment p in above
                   statement, e.g. one provided with Rhapsody 5.5, but
                   most recent example XL C 11.1 for AIX, even without
                   optimization flag... */
#else
                s->hit=(*p)?1:0; p++;
#endif
                s->s2->tmp.cert_type= *(p++);
                n2s(p,i);
                if (i < s->version) s->version=i;
                n2s(p,i); s->s2->tmp.cert_length=i;
                n2s(p,i); s->s2->tmp.csl=i;
                n2s(p,i); s->s2->tmp.conn_id_length=i;
                s->state=SSL2_ST_GET_SERVER_HELLO_B;
                }

        /* SSL2_ST_GET_SERVER_HELLO_B */
        len = 11 + (unsigned long)s->s2->tmp.cert_length + (unsigned long)s->s2->tmp.csl + (unsigned long)s->s2->tmp.conn_id_length;
        if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
                {
                SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_MESSAGE_TOO_LONG);
                return -1;
                }
        j = (int)len - s->init_num;
        i = ssl2_read(s,(char *)&(buf[s->init_num]),j);
        if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
        if (s->msg_callback)
                s->msg_callback(0, s->version, 0, buf, (size_t)len, s, s->msg_callback_arg); /* SERVER-HELLO */

        /* things are looking good */

        p = buf + 11;
        if (s->hit)
                {
                if (s->s2->tmp.cert_length != 0) 
                        {
                        SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
                        return(-1);
                        }
                if (s->s2->tmp.cert_type != 0)
                        {
                        if (!(s->options &
                                SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
                                {
                                SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
                                return(-1);
                                }
                        }
                if (s->s2->tmp.csl != 0)
                        {
                        SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
                        return(-1);
                        }
                }
        else
                {
#ifdef undef
                /* very bad */
                memset(s->session->session_id,0,
                        SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
                s->session->session_id_length=0;
                */
#endif

                /* we need to do this in case we were trying to reuse a 
                 * client session but others are already reusing it.
                 * If this was a new 'blank' session ID, the session-id
                 * length will still be 0 */
                if (s->session->session_id_length > 0)
                        {
                        if (!ssl_get_new_session(s,0))
                                {
                                ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                                return(-1);
                                }
                        }

                if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
                        s->s2->tmp.cert_length,p) <= 0)
                        {
                        ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
                        return(-1);
                        }
                p+=s->s2->tmp.cert_length;

                if (s->s2->tmp.csl == 0)
                        {
                        ssl2_return_error(s,SSL2_PE_NO_CIPHER);
                        SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
                        return(-1);
                        }

                /* We have just received a list of ciphers back from the
                 * server.  We need to get the ones that match, then select
                 * the one we want the most :-). */

                /* load the ciphers */
                sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
                                            &s->session->ciphers);
                p+=s->s2->tmp.csl;
                if (sk == NULL)
                        {
                        ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                        SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
                        return(-1);
                        }

                (void)sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);

                /* get the array of ciphers we will accept */
                cl=SSL_get_ciphers(s);
                (void)sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp);

                /*
                 * If server preference flag set, choose the first
                 * (highest priority) cipher the server sends, otherwise
                 * client preference has priority.
                 */
                if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
                    {
                    prio = sk;
                    allow = cl;
                    }
                else
                    {
                    prio = cl;
                    allow = sk;
                    }
                /* In theory we could have ciphers sent back that we
                 * don't want to use but that does not matter since we
                 * will check against the list we originally sent and
                 * for performance reasons we should not bother to match
                 * the two lists up just to check. */
                for (i=0; i<sk_SSL_CIPHER_num(prio); i++)
                        {
                        if (sk_SSL_CIPHER_find(allow,
                                             sk_SSL_CIPHER_value(prio,i)) >= 0)
                                break;
                        }

                if (i >= sk_SSL_CIPHER_num(prio))
                        {
                        ssl2_return_error(s,SSL2_PE_NO_CIPHER);
                        SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
                        return(-1);
                        }
                s->session->cipher=sk_SSL_CIPHER_value(prio,i);


                if (s->session->peer != NULL) /* can't happen*/
                        {
                        ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
                        SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
                        return(-1);
                        }

                s->session->peer = s->session->sess_cert->peer_key->x509;
                /* peer_key->x509 has been set by ssl2_set_certificate. */
                CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
                }

        if (s->session->sess_cert == NULL 
      || s->session->peer != s->session->sess_cert->peer_key->x509)
                /* can't happen */
                {
                ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
                SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
                return(-1);
                }
                
        s->s2->conn_id_length=s->s2->tmp.conn_id_length;
        if (s->s2->conn_id_length > sizeof s->s2->conn_id)
                {
                ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
                SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_SSL2_CONNECTION_ID_TOO_LONG);
                return -1;
                }
        memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
        return(1);
        }

static int client_hello(SSL *s)
        {
        unsigned char *buf;
        unsigned char *p,*d;
/*      CIPHER **cipher;*/
        int i,n,j;

        buf=(unsigned char *)s->init_buf->data;
        if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
                {
                if ((s->session == NULL) ||
                        (s->session->ssl_version != s->version))
                        {
                        if (!ssl_get_new_session(s,0))
                                {
                                ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                                return(-1);
                                }
                        }
                /* else use the pre-loaded session */

                p=buf;                                  /* header */
                d=p+9;                                  /* data section */
                *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
                s2n(SSL2_VERSION,p);                    /* version */
                n=j=0;

                n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d,0);
                d+=n;

                if (n == 0)
                        {
                        SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
                        return(-1);
                        }

                s2n(n,p);                       /* cipher spec num bytes */

                if ((s->session->session_id_length > 0) &&
                        (s->session->session_id_length <=
                        SSL2_MAX_SSL_SESSION_ID_LENGTH))
                        {
                        i=s->session->session_id_length;
                        s2n(i,p);               /* session id length */
                        memcpy(d,s->session->session_id,(unsigned int)i);
                        d+=i;
                        }
                else
                        {
                        s2n(0,p);
                        }

                s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
                s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
                /*challenge id data*/
                if (RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH) <= 0)
                        return -1;
                memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
                d+=SSL2_CHALLENGE_LENGTH;

                s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
                s->init_num=d-buf;
                s->init_off=0;
                }
        /* SSL2_ST_SEND_CLIENT_HELLO_B */
        return(ssl2_do_write(s));
        }

static int client_master_key(SSL *s)
        {
        unsigned char *buf;
        unsigned char *p,*d;
        int clear,enc,karg,i;
        SSL_SESSION *sess;
        const EVP_CIPHER *c;
        const EVP_MD *md;

        buf=(unsigned char *)s->init_buf->data;
        if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
                {

                if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL))
                        {
                        ssl2_return_error(s,SSL2_PE_NO_CIPHER);
                        SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
                        return(-1);
                        }
                sess=s->session;
                p=buf;
                d=p+10;
                *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */

                i=ssl_put_cipher_by_char(s,sess->cipher,p);
                p+=i;

                /* make key_arg data */
                i=EVP_CIPHER_iv_length(c);
                sess->key_arg_length=i;
                if (i > SSL_MAX_KEY_ARG_LENGTH)
                        {
                        ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
                        SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
                        return -1;
                        }
                if (i > 0)
                        if (RAND_pseudo_bytes(sess->key_arg,i) <= 0)
                                return -1;

                /* make a master key */
                i=EVP_CIPHER_key_length(c);
                sess->master_key_length=i;
                if (i > 0)
                        {
                        if (i > (int)sizeof(sess->master_key))
                                {
                                ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
                                SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
                                return -1;
                                }
                        if (RAND_bytes(sess->master_key,i) <= 0)
                                {
                                ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                                return(-1);
                                }
                        }

                if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
                        enc=8;
                else if (SSL_C_IS_EXPORT(sess->cipher))
                        enc=5;
                else
                        enc=i;

                if ((int)i < enc)
                        {
                        ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                        SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
                        return(-1);
                        }
                clear=i-enc;
                s2n(clear,p);
                memcpy(d,sess->master_key,(unsigned int)clear);
                d+=clear;

                enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
                        &(sess->master_key[clear]),d,
                        (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
                if (enc <= 0)
                        {
                        ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                        SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
                        return(-1);
                        }
#ifdef PKCS1_CHECK
                if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
                if (s->options & SSL_OP_PKCS1_CHECK_2)
                        sess->master_key[clear]++;
#endif
                s2n(enc,p);
                d+=enc;
                karg=sess->key_arg_length;      
                s2n(karg,p); /* key arg size */
                if (karg > (int)sizeof(sess->key_arg))
                        {
                        ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                        SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
                        return -1;
                        }
                memcpy(d,sess->key_arg,(unsigned int)karg);
                d+=karg;

                s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
                s->init_num=d-buf;
                s->init_off=0;
                }

        /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
        return(ssl2_do_write(s));
        }

static int client_finished(SSL *s)
        {
        unsigned char *p;

        if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
                {
                p=(unsigned char *)s->init_buf->data;
                *(p++)=SSL2_MT_CLIENT_FINISHED;
                if (s->s2->conn_id_length > sizeof s->s2->conn_id)
                        {
                        SSLerr(SSL_F_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
                        return -1;
                        }
                memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);

                s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
                s->init_num=s->s2->conn_id_length+1;
                s->init_off=0;
                }
        return(ssl2_do_write(s));
        }

/* read the data and then respond */
static int client_certificate(SSL *s)
        {
        unsigned char *buf;
        unsigned char *p,*d;
        int i;
        unsigned int n;
        int cert_ch_len;
        unsigned char *cert_ch;

        buf=(unsigned char *)s->init_buf->data;

        /* We have a cert associated with the SSL, so attach it to
         * the session if it does not have one */

        if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
                {
                i=ssl2_read(s,(char *)&(buf[s->init_num]),
                        SSL2_MAX_CERT_CHALLENGE_LENGTH+2-s->init_num);
                if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+2-s->init_num))
                        return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
                s->init_num += i;
                if (s->msg_callback)
                        s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* REQUEST-CERTIFICATE */

                /* type=buf[0]; */
                /* type eq x509 */
                if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
                        {
                        ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
                        SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
                        return(-1);
                        }

                if ((s->cert == NULL) ||
                        (s->cert->key->x509 == NULL) ||
                        (s->cert->key->privatekey == NULL))
                        {
                        s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
                        }
                else
                        s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
                }

        cert_ch = buf + 2;
        cert_ch_len = s->init_num - 2;

        if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
                {
                X509 *x509=NULL;
                EVP_PKEY *pkey=NULL;

                /* If we get an error we need to
                 * ssl->rwstate=SSL_X509_LOOKUP;
                 * return(error);
                 * We should then be retried when things are ok and we
                 * can get a cert or not */

                i=0;
                if (s->ctx->client_cert_cb != NULL)
                        {
                        i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
                        }

                if (i < 0)
                        {
                        s->rwstate=SSL_X509_LOOKUP;
                        return(-1);
                        }
                s->rwstate=SSL_NOTHING;

                if ((i == 1) && (pkey != NULL) && (x509 != NULL))
                        {
                        s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
                        if (    !SSL_use_certificate(s,x509) || 
                                !SSL_use_PrivateKey(s,pkey))
                                {
                                i=0;
                                }
                        X509_free(x509);
                        EVP_PKEY_free(pkey);
                        }
                else if (i == 1)
                        {
                        if (x509 != NULL) X509_free(x509);
                        if (pkey != NULL) EVP_PKEY_free(pkey);
                        SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
                        i=0;
                        }

                if (i == 0)
                        {
                        /* We have no client certificate to respond with
                         * so send the correct error message back */
                        s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
                        p=buf;
                        *(p++)=SSL2_MT_ERROR;
                        s2n(SSL2_PE_NO_CERTIFICATE,p);
                        s->init_off=0;
                        s->init_num=3;
                        /* Write is done at the end */
                        }
                }

        if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
                {
                return(ssl2_do_write(s));
                }

        if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
                {
                EVP_MD_CTX ctx;

                /* ok, now we calculate the checksum
                 * do it first so we can reuse buf :-) */
                p=buf;
                EVP_MD_CTX_init(&ctx);
                EVP_SignInit_ex(&ctx,s->ctx->rsa_md5, NULL);
                EVP_SignUpdate(&ctx,s->s2->key_material,
                               s->s2->key_material_length);
                EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
                i=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
                /* Don't update the signature if it fails - FIXME: probably should handle this better */
                if(i > 0)
                        EVP_SignUpdate(&ctx,buf,(unsigned int)i);

                p=buf;
                d=p+6;
                *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
                *(p++)=SSL2_CT_X509_CERTIFICATE;
                n=i2d_X509(s->cert->key->x509,&d);
                s2n(n,p);

                if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
                        {
                        /* this is not good.  If things have failed it
                         * means there so something wrong with the key.
                         * We will continue with a 0 length signature
                         */
                        }
                EVP_MD_CTX_cleanup(&ctx);
                s2n(n,p);
                d+=n;

                s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
                s->init_num=d-buf;
                s->init_off=0;
                }
        /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
        return(ssl2_do_write(s));
        }

static int get_server_verify(SSL *s)
        {
        unsigned char *p;
        int i, n, len;

        p=(unsigned char *)s->init_buf->data;
        if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
                {
                i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
                if (i < (1-s->init_num)) 
                        return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
                s->init_num += i;

                s->state= SSL2_ST_GET_SERVER_VERIFY_B;
                if (*p != SSL2_MT_SERVER_VERIFY)
                        {
                        if (p[0] != SSL2_MT_ERROR)
                                {
                                ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                                SSLerr(SSL_F_GET_SERVER_VERIFY,
                                        SSL_R_READ_WRONG_PACKET_TYPE);
                                }
                        else
                                {
                                SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_PEER_ERROR);
                                /* try to read the error message */
                                i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
                                return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
                                }
                        return(-1);
                        }
                }
        
        p=(unsigned char *)s->init_buf->data;
        len = 1 + s->s2->challenge_length;
        n =  len - s->init_num;
        i = ssl2_read(s,(char *)&(p[s->init_num]),n);
        if (i < n)
                return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
        if (s->msg_callback)
                s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* SERVER-VERIFY */
        p += 1;

        if (memcmp(p,s->s2->challenge,s->s2->challenge_length) != 0)
                {
                ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
                return(-1);
                }
        return(1);
        }

static int get_server_finished(SSL *s)
        {
        unsigned char *buf;
        unsigned char *p;
        int i, n, len;

        buf=(unsigned char *)s->init_buf->data;
        p=buf;
        if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
                {
                i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
                if (i < (1-s->init_num))
                        return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
                s->init_num += i;

                if (*p == SSL2_MT_REQUEST_CERTIFICATE)
                        {
                        s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
                        return(1);
                        }
                else if (*p != SSL2_MT_SERVER_FINISHED)
                        {
                        if (p[0] != SSL2_MT_ERROR)
                                {
                                ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                                SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
                                }
                        else
                                {
                                SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
                                /* try to read the error message */
                                i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
                                return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
                                }
                        return(-1);
                        }
                s->state=SSL2_ST_GET_SERVER_FINISHED_B;
                }

        len = 1 + SSL2_SSL_SESSION_ID_LENGTH;
        n = len - s->init_num;
        i = ssl2_read(s,(char *)&(buf[s->init_num]), n);
        if (i < n) /* XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, that's the maximum */
                return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
        s->init_num += i;
        if (s->msg_callback)
                s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* SERVER-FINISHED */

        if (!s->hit) /* new session */
                {
                /* new session-id */
                /* Make sure we were not trying to re-use an old SSL_SESSION
                 * or bad things can happen */
                /* ZZZZZZZZZZZZZ */
                s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
                memcpy(s->session->session_id,p+1,SSL2_SSL_SESSION_ID_LENGTH);
                }
        else
                {
                if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
                        {
                        if ((s->session->session_id_length > sizeof s->session->session_id)
                            || (0 != memcmp(buf + 1, s->session->session_id,
                                            (unsigned int)s->session->session_id_length)))
                                {
                                ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
                                SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
                                return(-1);
                                }
                        }
                }
        s->state = SSL_ST_OK;
        return(1);
        }

/* loads in the certificate from the server */
int ssl2_set_certificate(SSL *s, int type, int len, const unsigned char *data)
        {
        STACK_OF(X509) *sk=NULL;
        EVP_PKEY *pkey=NULL;
        SESS_CERT *sc=NULL;
        int i;
        X509 *x509=NULL;
        int ret=0;
        
        x509=d2i_X509(NULL,&data,(long)len);
        if (x509 == NULL)
                {
                SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
                goto err;
                }

        if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
                {
                SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
                goto err;
                }

        i=ssl_verify_cert_chain(s,sk);
                
        if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0))
                {
                SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
                goto err;
                }
        ERR_clear_error(); /* but we keep s->verify_result */
        s->session->verify_result = s->verify_result;

        /* server's cert for this session */
        sc=ssl_sess_cert_new();
        if (sc == NULL)
                {
                ret= -1;
                goto err;
                }
        if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
        s->session->sess_cert=sc;

        sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
        sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);

        pkey=X509_get_pubkey(x509);
        x509=NULL;
        if (pkey == NULL)
                {
                SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
                goto err;
                }
        if (pkey->type != EVP_PKEY_RSA)
                {
                SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
                goto err;
                }

        if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
                goto err;
        ret=1;
err:
        sk_X509_free(sk);
        X509_free(x509);
        EVP_PKEY_free(pkey);
        return(ret);
        }

static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
             unsigned char *to, int padding)
        {
        EVP_PKEY *pkey=NULL;
        int i= -1;

        if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
                ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
                {
                SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
                return(-1);
                }
        if (pkey->type != EVP_PKEY_RSA)
                {
                SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
                goto end;
                }

        /* we have the public key */
        i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
        if (i < 0)
                SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
end:
        EVP_PKEY_free(pkey);
        return(i);
        }
#else /* !OPENSSL_NO_SSL2 */

# if PEDANTIC
static void *dummy=&dummy;
# endif

#endif