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s3_both.c

/* ssl/s3_both.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) 1998-2002 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 <limits.h>
#include <string.h>
#include <stdio.h>
#include "ssl_locl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/x509.h>

/* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
int ssl3_do_write(SSL *s, int type)
      {
      int ret;

      ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
                           s->init_num);
      if (ret < 0) return(-1);
      if (type == SSL3_RT_HANDSHAKE)
            /* should not be done for 'Hello Request's, but in that case
             * we'll ignore the result anyway */
            ssl3_finish_mac(s,(unsigned char *)&s->init_buf->data[s->init_off],ret);
      
      if (ret == s->init_num)
            {
            if (s->msg_callback)
                  s->msg_callback(1, s->version, type, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);
            return(1);
            }
      s->init_off+=ret;
      s->init_num-=ret;
      return(0);
      }

int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
      {
      unsigned char *p,*d;
      int i;
      unsigned long l;

      if (s->state == a)
            {
            d=(unsigned char *)s->init_buf->data;
            p= &(d[4]);

            i=s->method->ssl3_enc->final_finish_mac(s,
                  &(s->s3->finish_dgst1),
                  &(s->s3->finish_dgst2),
                  sender,slen,s->s3->tmp.finish_md);
            s->s3->tmp.finish_md_len = i;
            memcpy(p, s->s3->tmp.finish_md, i);
            p+=i;
            l=i;

#ifdef OPENSSL_SYS_WIN16
            /* MSVC 1.5 does not clear the top bytes of the word unless
             * I do this.
             */
            l&=0xffff;
#endif

            *(d++)=SSL3_MT_FINISHED;
            l2n3(l,d);
            s->init_num=(int)l+4;
            s->init_off=0;

            s->state=b;
            }

      /* SSL3_ST_SEND_xxxxxx_HELLO_B */
      return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
      }

int ssl3_get_finished(SSL *s, int a, int b)
      {
      int al,i,ok;
      long n;
      unsigned char *p;

      /* the mac has already been generated when we received the
       * change cipher spec message and is in s->s3->tmp.peer_finish_md
       */ 

      n=ssl3_get_message(s,
            a,
            b,
            SSL3_MT_FINISHED,
            64, /* should actually be 36+4 :-) */
            &ok);

      if (!ok) return((int)n);

      /* If this occurs, we have missed a message */
      if (!s->s3->change_cipher_spec)
            {
            al=SSL_AD_UNEXPECTED_MESSAGE;
            SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
            goto f_err;
            }
      s->s3->change_cipher_spec=0;

      p = (unsigned char *)s->init_msg;
      i = s->s3->tmp.peer_finish_md_len;

      if (i != n)
            {
            al=SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
            goto f_err;
            }

      if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
            {
            al=SSL_AD_DECRYPT_ERROR;
            SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
            goto f_err;
            }

      return(1);
f_err:
      ssl3_send_alert(s,SSL3_AL_FATAL,al);
      return(0);
      }

/* for these 2 messages, we need to
 * ssl->enc_read_ctx                re-init
 * ssl->s3->read_sequence           zero
 * ssl->s3->read_mac_secret         re-init
 * ssl->session->read_sym_enc       assign
 * ssl->session->read_compression   assign
 * ssl->session->read_hash          assign
 */
int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
      { 
      unsigned char *p;

      if (s->state == a)
            {
            p=(unsigned char *)s->init_buf->data;
            *p=SSL3_MT_CCS;
            s->init_num=1;
            s->init_off=0;

            s->state=b;
            }

      /* SSL3_ST_CW_CHANGE_B */
      return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
      }

unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
      {
      unsigned char *p;
      int n,i;
      unsigned long l=7;
      BUF_MEM *buf;
      X509_STORE_CTX xs_ctx;
      X509_OBJECT obj;

      int no_chain;

      if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || s->ctx->extra_certs)
            no_chain = 1;
      else
            no_chain = 0;

      /* TLSv1 sends a chain with nothing in it, instead of an alert */
      buf=s->init_buf;
      if (!BUF_MEM_grow_clean(buf,10))
            {
            SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
            return(0);
            }
      if (x != NULL)
            {
            if(!no_chain && !X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL))
                  {
                  SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
                  return(0);
                  }

            for (;;)
                  {
                  n=i2d_X509(x,NULL);
                  if (!BUF_MEM_grow_clean(buf,(int)(n+l+3)))
                        {
                        SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
                        return(0);
                        }
                  p=(unsigned char *)&(buf->data[l]);
                  l2n3(n,p);
                  i2d_X509(x,&p);
                  l+=n+3;

                  if (no_chain)
                        break;

                  if (X509_NAME_cmp(X509_get_subject_name(x),
                        X509_get_issuer_name(x)) == 0) break;

                  i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
                        X509_get_issuer_name(x),&obj);
                  if (i <= 0) break;
                  x=obj.data.x509;
                  /* Count is one too high since the X509_STORE_get uped the
                   * ref count */
                  X509_free(x);
                  }
            if (!no_chain)
                  X509_STORE_CTX_cleanup(&xs_ctx);
            }

      /* Thawte special :-) */
      if (s->ctx->extra_certs != NULL)
      for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
            {
            x=sk_X509_value(s->ctx->extra_certs,i);
            n=i2d_X509(x,NULL);
            if (!BUF_MEM_grow_clean(buf,(int)(n+l+3)))
                  {
                  SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
                  return(0);
                  }
            p=(unsigned char *)&(buf->data[l]);
            l2n3(n,p);
            i2d_X509(x,&p);
            l+=n+3;
            }

      l-=7;
      p=(unsigned char *)&(buf->data[4]);
      l2n3(l,p);
      l+=3;
      p=(unsigned char *)&(buf->data[0]);
      *(p++)=SSL3_MT_CERTIFICATE;
      l2n3(l,p);
      l+=4;
      return(l);
      }

/* Obtain handshake message of message type 'mt' (any if mt == -1),
 * maximum acceptable body length 'max'.
 * The first four bytes (msg_type and length) are read in state 'st1',
 * the body is read in state 'stn'.
 */
long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
      {
      unsigned char *p;
      unsigned long l;
      long n;
      int i,al;

      if (s->s3->tmp.reuse_message)
            {
            s->s3->tmp.reuse_message=0;
            if ((mt >= 0) && (s->s3->tmp.message_type != mt))
                  {
                  al=SSL_AD_UNEXPECTED_MESSAGE;
                  SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
                  goto f_err;
                  }
            *ok=1;
            s->init_msg = s->init_buf->data + 4;
            s->init_num = (int)s->s3->tmp.message_size;
            return s->init_num;
            }

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

      if (s->state == st1) /* s->init_num < 4 */
            {
            int skip_message;

            do
                  {
                  while (s->init_num < 4)
                        {
                        i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],
                              4 - s->init_num, 0);
                        if (i <= 0)
                              {
                              s->rwstate=SSL_READING;
                              *ok = 0;
                              return i;
                              }
                        s->init_num+=i;
                        }
                  
                  skip_message = 0;
                  if (!s->server)
                        if (p[0] == SSL3_MT_HELLO_REQUEST)
                              /* The server may always send 'Hello Request' messages --
                               * we are doing a handshake anyway now, so ignore them
                               * if their format is correct. Does not count for
                               * 'Finished' MAC. */
                              if (p[1] == 0 && p[2] == 0 &&p[3] == 0)
                                    {
                                    s->init_num = 0;
                                    skip_message = 1;

                                    if (s->msg_callback)
                                          s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, 4, s, s->msg_callback_arg);
                                    }
                  }
            while (skip_message);

            /* s->init_num == 4 */

            if ((mt >= 0) && (*p != mt))
                  {
                  al=SSL_AD_UNEXPECTED_MESSAGE;
                  SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
                  goto f_err;
                  }
            if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
                              (st1 == SSL3_ST_SR_CERT_A) &&
                              (stn == SSL3_ST_SR_CERT_B))
                  {
                  /* At this point we have got an MS SGC second client
                   * hello (maybe we should always allow the client to
                   * start a new handshake?). We need to restart the mac.
                   * Don't increment {num,total}_renegotiations because
                   * we have not completed the handshake. */
                  ssl3_init_finished_mac(s);
                  }

            s->s3->tmp.message_type= *(p++);

            n2l3(p,l);
            if (l > (unsigned long)max)
                  {
                  al=SSL_AD_ILLEGAL_PARAMETER;
                  SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
                  goto f_err;
                  }
            if (l > (INT_MAX-4)) /* BUF_MEM_grow takes an 'int' parameter */
                  {
                  al=SSL_AD_ILLEGAL_PARAMETER;
                  SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
                  goto f_err;
                  }
            if (l && !BUF_MEM_grow_clean(s->init_buf,(int)l+4))
                  {
                  SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
                  goto err;
                  }
            s->s3->tmp.message_size=l;
            s->state=stn;

            s->init_msg = s->init_buf->data + 4;
            s->init_num = 0;
            }

      /* next state (stn) */
      p = s->init_msg;
      n = s->s3->tmp.message_size - s->init_num;
      while (n > 0)
            {
            i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n,0);
            if (i <= 0)
                  {
                  s->rwstate=SSL_READING;
                  *ok = 0;
                  return i;
                  }
            s->init_num += i;
            n -= i;
            }
      ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);
      if (s->msg_callback)
            s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, (size_t)s->init_num + 4, s, s->msg_callback_arg);
      *ok=1;
      return s->init_num;
f_err:
      ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
      *ok=0;
      return(-1);
      }

int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
      {
      EVP_PKEY *pk;
      int ret= -1,i,j;

      if (pkey == NULL)
            pk=X509_get_pubkey(x);
      else
            pk=pkey;
      if (pk == NULL) goto err;

      i=pk->type;
      if (i == EVP_PKEY_RSA)
            {
            ret=SSL_PKEY_RSA_ENC;
            if (x != NULL)
                  {
                  j=X509_get_ext_count(x);
                  /* check to see if this is a signing only certificate */
                  /* EAY EAY EAY EAY */
                  }
            }
      else if (i == EVP_PKEY_DSA)
            {
            ret=SSL_PKEY_DSA_SIGN;
            }
      else if (i == EVP_PKEY_DH)
            {
            /* if we just have a key, we needs to be guess */

            if (x == NULL)
                  ret=SSL_PKEY_DH_DSA;
            else
                  {
                  j=X509_get_signature_type(x);
                  if (j == EVP_PKEY_RSA)
                        ret=SSL_PKEY_DH_RSA;
                  else if (j== EVP_PKEY_DSA)
                        ret=SSL_PKEY_DH_DSA;
                  else ret= -1;
                  }
            }
      else
            ret= -1;

err:
      if(!pkey) EVP_PKEY_free(pk);
      return(ret);
      }

int ssl_verify_alarm_type(long type)
      {
      int al;

      switch(type)
            {
      case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
      case X509_V_ERR_UNABLE_TO_GET_CRL:
      case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
            al=SSL_AD_UNKNOWN_CA;
            break;
      case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
      case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
      case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
      case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
      case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
      case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
      case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
      case X509_V_ERR_CERT_NOT_YET_VALID:
      case X509_V_ERR_CRL_NOT_YET_VALID:
      case X509_V_ERR_CERT_UNTRUSTED:
      case X509_V_ERR_CERT_REJECTED:
            al=SSL_AD_BAD_CERTIFICATE;
            break;
      case X509_V_ERR_CERT_SIGNATURE_FAILURE:
      case X509_V_ERR_CRL_SIGNATURE_FAILURE:
            al=SSL_AD_DECRYPT_ERROR;
            break;
      case X509_V_ERR_CERT_HAS_EXPIRED:
      case X509_V_ERR_CRL_HAS_EXPIRED:
            al=SSL_AD_CERTIFICATE_EXPIRED;
            break;
      case X509_V_ERR_CERT_REVOKED:
            al=SSL_AD_CERTIFICATE_REVOKED;
            break;
      case X509_V_ERR_OUT_OF_MEM:
            al=SSL_AD_INTERNAL_ERROR;
            break;
      case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
      case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
      case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
      case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
      case X509_V_ERR_CERT_CHAIN_TOO_LONG:
      case X509_V_ERR_PATH_LENGTH_EXCEEDED:
      case X509_V_ERR_INVALID_CA:
            al=SSL_AD_UNKNOWN_CA;
            break;
      case X509_V_ERR_APPLICATION_VERIFICATION:
            al=SSL_AD_HANDSHAKE_FAILURE;
            break;
      case X509_V_ERR_INVALID_PURPOSE:
            al=SSL_AD_UNSUPPORTED_CERTIFICATE;
            break;
      default:
            al=SSL_AD_CERTIFICATE_UNKNOWN;
            break;
            }
      return(al);
      }

int ssl3_setup_buffers(SSL *s)
      {
      unsigned char *p;
      unsigned int extra;
      size_t len;

      if (s->s3->rbuf.buf == NULL)
            {
            if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
                  extra=SSL3_RT_MAX_EXTRA;
            else
                  extra=0;
            len = SSL3_RT_MAX_PACKET_SIZE + extra;
            if ((p=OPENSSL_malloc(len)) == NULL)
                  goto err;
            s->s3->rbuf.buf = p;
            s->s3->rbuf.len = len;
            }

      if (s->s3->wbuf.buf == NULL)
            {
            len = SSL3_RT_MAX_PACKET_SIZE;
            len += SSL3_RT_HEADER_LENGTH + 256; /* extra space for empty fragment */
            if ((p=OPENSSL_malloc(len)) == NULL)
                  goto err;
            s->s3->wbuf.buf = p;
            s->s3->wbuf.len = len;
            }
      s->packet= &(s->s3->rbuf.buf[0]);
      return(1);
err:
      SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
      return(0);
      }

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