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s2_lib.c

/* ssl/s2_lib.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.]
 */

#include "ssl_locl.h"
#ifndef OPENSSL_NO_SSL2
#include <stdio.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/md5.h>

const char ssl2_version_str[]="SSLv2" OPENSSL_VERSION_PTEXT;

#define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))

/* list of available SSLv2 ciphers (sorted by id) */
OPENSSL_GLOBAL SSL_CIPHER ssl2_ciphers[]={
/* NULL_WITH_MD5 v3 */
#if 0
      {
      1,
      SSL2_TXT_NULL_WITH_MD5,
      SSL2_CK_NULL_WITH_MD5,
      SSL_kRSA|SSL_aRSA|SSL_eNULL|SSL_MD5|SSL_SSLV2,
      SSL_EXPORT|SSL_EXP40|SSL_STRONG_NONE,
      0,
      0,
      0,
      SSL_ALL_CIPHERS,
      SSL_ALL_STRENGTHS,
      },
#endif
/* RC4_128_WITH_MD5 */
      {
      1,
      SSL2_TXT_RC4_128_WITH_MD5,
      SSL2_CK_RC4_128_WITH_MD5,
      SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
      SSL_NOT_EXP|SSL_MEDIUM,
      0,
      128,
      128,
      SSL_ALL_CIPHERS,
      SSL_ALL_STRENGTHS,
      },
/* RC4_128_EXPORT40_WITH_MD5 */
      {
      1,
      SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
      SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
      SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
      SSL_EXPORT|SSL_EXP40,
      SSL2_CF_5_BYTE_ENC,
      40,
      128,
      SSL_ALL_CIPHERS,
      SSL_ALL_STRENGTHS,
      },
/* RC2_128_CBC_WITH_MD5 */
      {
      1,
      SSL2_TXT_RC2_128_CBC_WITH_MD5,
      SSL2_CK_RC2_128_CBC_WITH_MD5,
      SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
      SSL_NOT_EXP|SSL_MEDIUM,
      0,
      128,
      128,
      SSL_ALL_CIPHERS,
      SSL_ALL_STRENGTHS,
      },
/* RC2_128_CBC_EXPORT40_WITH_MD5 */
      {
      1,
      SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
      SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
      SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
      SSL_EXPORT|SSL_EXP40,
      SSL2_CF_5_BYTE_ENC,
      40,
      128,
      SSL_ALL_CIPHERS,
      SSL_ALL_STRENGTHS,
      },
/* IDEA_128_CBC_WITH_MD5 */
#ifndef OPENSSL_NO_IDEA
      {
      1,
      SSL2_TXT_IDEA_128_CBC_WITH_MD5,
      SSL2_CK_IDEA_128_CBC_WITH_MD5,
      SSL_kRSA|SSL_aRSA|SSL_IDEA|SSL_MD5|SSL_SSLV2,
      SSL_NOT_EXP|SSL_MEDIUM,
      0,
      128,
      128,
      SSL_ALL_CIPHERS,
      SSL_ALL_STRENGTHS,
      },
#endif
/* DES_64_CBC_WITH_MD5 */
      {
      1,
      SSL2_TXT_DES_64_CBC_WITH_MD5,
      SSL2_CK_DES_64_CBC_WITH_MD5,
      SSL_kRSA|SSL_aRSA|SSL_DES|SSL_MD5|SSL_SSLV2,
      SSL_NOT_EXP|SSL_LOW,
      0,
      56,
      56,
      SSL_ALL_CIPHERS,
      SSL_ALL_STRENGTHS,
      },
/* DES_192_EDE3_CBC_WITH_MD5 */
      {
      1,
      SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
      SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
      SSL_kRSA|SSL_aRSA|SSL_3DES|SSL_MD5|SSL_SSLV2,
      SSL_NOT_EXP|SSL_HIGH,
      0,
      168,
      168,
      SSL_ALL_CIPHERS,
      SSL_ALL_STRENGTHS,
      },
/* RC4_64_WITH_MD5 */
#if 0
      {
      1,
      SSL2_TXT_RC4_64_WITH_MD5,
      SSL2_CK_RC4_64_WITH_MD5,
      SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
      SSL_NOT_EXP|SSL_LOW,
      SSL2_CF_8_BYTE_ENC,
      64,
      64,
      SSL_ALL_CIPHERS,
      SSL_ALL_STRENGTHS,
      },
#endif
/* NULL SSLeay (testing) */
#if 0
      {     
      0,
      SSL2_TXT_NULL,
      SSL2_CK_NULL,
      0,
      SSL_STRONG_NONE,
      0,
      0,
      0,
      SSL_ALL_CIPHERS,
      SSL_ALL_STRENGTHS,
      },
#endif

/* end of list :-) */
      };

long ssl2_default_timeout(void)
      {
      return(300);
      }

IMPLEMENT_ssl2_meth_func(sslv2_base_method,
                  ssl_undefined_function,
                  ssl_undefined_function,
                  ssl_bad_method)

int ssl2_num_ciphers(void)
      {
      return(SSL2_NUM_CIPHERS);
      }

SSL_CIPHER *ssl2_get_cipher(unsigned int u)
      {
      if (u < SSL2_NUM_CIPHERS)
            return(&(ssl2_ciphers[SSL2_NUM_CIPHERS-1-u]));
      else
            return(NULL);
      }

int ssl2_pending(const SSL *s)
      {
      return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
      }

int ssl2_new(SSL *s)
      {
      SSL2_STATE *s2;

      if ((s2=OPENSSL_malloc(sizeof *s2)) == NULL) goto err;
      memset(s2,0,sizeof *s2);

#if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
#  error "assertion failed"
#endif

      if ((s2->rbuf=OPENSSL_malloc(
            SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err;
      /* wbuf needs one byte more because when using two-byte headers,
       * we leave the first byte unused in do_ssl_write (s2_pkt.c) */
      if ((s2->wbuf=OPENSSL_malloc(
            SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+3)) == NULL) goto err;
      s->s2=s2;

      ssl2_clear(s);
      return(1);
err:
      if (s2 != NULL)
            {
            if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
            if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
            OPENSSL_free(s2);
            }
      return(0);
      }

void ssl2_free(SSL *s)
      {
      SSL2_STATE *s2;

      if(s == NULL)
          return;

      s2=s->s2;
      if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
      if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
      OPENSSL_cleanse(s2,sizeof *s2);
      OPENSSL_free(s2);
      s->s2=NULL;
      }

void ssl2_clear(SSL *s)
      {
      SSL2_STATE *s2;
      unsigned char *rbuf,*wbuf;

      s2=s->s2;

      rbuf=s2->rbuf;
      wbuf=s2->wbuf;

      memset(s2,0,sizeof *s2);

      s2->rbuf=rbuf;
      s2->wbuf=wbuf;
      s2->clear_text=1;
      s->packet=s2->rbuf;
      s->version=SSL2_VERSION;
      s->packet_length=0;
      }

long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
      {
      int ret=0;

      switch(cmd)
            {
      case SSL_CTRL_GET_SESSION_REUSED:
            ret=s->hit;
            break;
      default:
            break;
            }
      return(ret);
      }

long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp)(void))
      {
      return(0);
      }

long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
      {
      return(0);
      }

long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)(void))
      {
      return(0);
      }

/* This function needs to check if the ciphers required are actually
 * available */
SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
      {
      SSL_CIPHER c,*cp;
      unsigned long id;

      id=0x02000000L|((unsigned long)p[0]<<16L)|
            ((unsigned long)p[1]<<8L)|(unsigned long)p[2];
      c.id=id;
      cp = (SSL_CIPHER *)OBJ_bsearch((char *)&c,
            (char *)ssl2_ciphers,
            SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER),
            FP_ICC ssl_cipher_id_cmp);
      if ((cp == NULL) || (cp->valid == 0))
            return NULL;
      else
            return cp;
      }

int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
      {
      long l;

      if (p != NULL)
            {
            l=c->id;
            if ((l & 0xff000000) != 0x02000000) return(0);
            p[0]=((unsigned char)(l>>16L))&0xFF;
            p[1]=((unsigned char)(l>> 8L))&0xFF;
            p[2]=((unsigned char)(l     ))&0xFF;
            }
      return(3);
      }

int ssl2_generate_key_material(SSL *s)
      {
      unsigned int i;
      EVP_MD_CTX ctx;
      unsigned char *km;
      unsigned char c='0';
      const EVP_MD *md5;

      md5 = EVP_md5();

#ifdef CHARSET_EBCDIC
      c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0',
                        see SSLv2 docu */
#endif
      EVP_MD_CTX_init(&ctx);
      km=s->s2->key_material;

      if (s->session->master_key_length < 0 ||
                  s->session->master_key_length > (int)sizeof(s->session->master_key))
            {
            SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
            return 0;
            }

      for (i=0; i<s->s2->key_material_length; i += EVP_MD_size(md5))
            {
            if (((km - s->s2->key_material) + EVP_MD_size(md5)) >
                        (int)sizeof(s->s2->key_material))
                  {
                  /* EVP_DigestFinal_ex() below would write beyond buffer */
                  SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
                  return 0;
                  }

            EVP_DigestInit_ex(&ctx, md5, NULL);

            OPENSSL_assert(s->session->master_key_length >= 0
                && s->session->master_key_length
                < (int)sizeof(s->session->master_key));
            EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length);
            EVP_DigestUpdate(&ctx,&c,1);
            c++;
            EVP_DigestUpdate(&ctx,s->s2->challenge,s->s2->challenge_length);
            EVP_DigestUpdate(&ctx,s->s2->conn_id,s->s2->conn_id_length);
            EVP_DigestFinal_ex(&ctx,km,NULL);
            km += EVP_MD_size(md5);
            }

      EVP_MD_CTX_cleanup(&ctx);
      return 1;
      }

void ssl2_return_error(SSL *s, int err)
      {
      if (!s->error)
            {
            s->error=3;
            s->error_code=err;

            ssl2_write_error(s);
            }
      }


void ssl2_write_error(SSL *s)
      {
      unsigned char buf[3];
      int i,error;

      buf[0]=SSL2_MT_ERROR;
      buf[1]=(s->error_code>>8)&0xff;
      buf[2]=(s->error_code)&0xff;

/*    state=s->rwstate;*/

      error=s->error; /* number of bytes left to write */
      s->error=0;
      OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
      i=ssl2_write(s,&(buf[3-error]),error);

/*    if (i == error) s->rwstate=state; */

      if (i < 0)
            s->error=error;
      else
            {
            s->error=error-i;

            if (s->error == 0)
                  if (s->msg_callback)
                        s->msg_callback(1, s->version, 0, buf, 3, s, s->msg_callback_arg); /* ERROR */
            }
      }

int ssl2_shutdown(SSL *s)
      {
      s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
      return(1);
      }
#else /* !OPENSSL_NO_SSL2 */

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

#endif

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