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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 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 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);
                  }
#ifdef __APPLE_CC__
            /* The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug
             * workaround. <appro@fy.chalmers.se> */
            s->hit=(i=*(p++))?1:0;
#else
            s->hit=(*(p++))?1:0;
#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))
                  {
                  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);
            n=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
            EVP_SignUpdate(&ctx,buf,(unsigned int)n);

            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

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