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ssl_asn1.c

/* ssl/ssl_asn1.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 <stdio.h>
#include <stdlib.h>
#include "ssl_locl.h"
#include <openssl/asn1_mac.h>
#include <openssl/objects.h>
#include <openssl/x509.h>

typedef struct ssl_session_asn1_st
      {
      ASN1_INTEGER version;
      ASN1_INTEGER ssl_version;
      ASN1_OCTET_STRING cipher;
      ASN1_OCTET_STRING master_key;
      ASN1_OCTET_STRING session_id;
      ASN1_OCTET_STRING session_id_context;
      ASN1_OCTET_STRING key_arg;
#ifndef OPENSSL_NO_KRB5
        ASN1_OCTET_STRING krb5_princ;
#endif /* OPENSSL_NO_KRB5 */
      ASN1_INTEGER time;
      ASN1_INTEGER timeout;
      ASN1_INTEGER verify_result;
      } SSL_SESSION_ASN1;

int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp)
      {
#define LSIZE2 (sizeof(long)*2)
      int v1=0,v2=0,v3=0,v4=0,v5=0;
      unsigned char buf[4],ibuf1[LSIZE2],ibuf2[LSIZE2];
      unsigned char ibuf3[LSIZE2],ibuf4[LSIZE2],ibuf5[LSIZE2];
      long l;
      SSL_SESSION_ASN1 a;
      M_ASN1_I2D_vars(in);

      if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
            return(0);

      /* Note that I cheat in the following 2 assignments.  I know
       * that if the ASN1_INTEGER passed to ASN1_INTEGER_set
       * is > sizeof(long)+1, the buffer will not be re-OPENSSL_malloc()ed.
       * This is a bit evil but makes things simple, no dynamic allocation
       * to clean up :-) */
      a.version.length=LSIZE2;
      a.version.type=V_ASN1_INTEGER;
      a.version.data=ibuf1;
      ASN1_INTEGER_set(&(a.version),SSL_SESSION_ASN1_VERSION);

      a.ssl_version.length=LSIZE2;
      a.ssl_version.type=V_ASN1_INTEGER;
      a.ssl_version.data=ibuf2;
      ASN1_INTEGER_set(&(a.ssl_version),in->ssl_version);

      a.cipher.type=V_ASN1_OCTET_STRING;
      a.cipher.data=buf;

      if (in->cipher == NULL)
            l=in->cipher_id;
      else
            l=in->cipher->id;
      if (in->ssl_version == SSL2_VERSION)
            {
            a.cipher.length=3;
            buf[0]=((unsigned char)(l>>16L))&0xff;
            buf[1]=((unsigned char)(l>> 8L))&0xff;
            buf[2]=((unsigned char)(l     ))&0xff;
            }
      else
            {
            a.cipher.length=2;
            buf[0]=((unsigned char)(l>>8L))&0xff;
            buf[1]=((unsigned char)(l    ))&0xff;
            }

      a.master_key.length=in->master_key_length;
      a.master_key.type=V_ASN1_OCTET_STRING;
      a.master_key.data=in->master_key;

      a.session_id.length=in->session_id_length;
      a.session_id.type=V_ASN1_OCTET_STRING;
      a.session_id.data=in->session_id;

      a.session_id_context.length=in->sid_ctx_length;
      a.session_id_context.type=V_ASN1_OCTET_STRING;
      a.session_id_context.data=in->sid_ctx;

      a.key_arg.length=in->key_arg_length;
      a.key_arg.type=V_ASN1_OCTET_STRING;
      a.key_arg.data=in->key_arg;

#ifndef OPENSSL_NO_KRB5
      if (in->krb5_client_princ_len)
            {
            a.krb5_princ.length=in->krb5_client_princ_len;
            a.krb5_princ.type=V_ASN1_OCTET_STRING;
            a.krb5_princ.data=in->krb5_client_princ;
            }
#endif /* OPENSSL_NO_KRB5 */
 
      if (in->time != 0L)
            {
            a.time.length=LSIZE2;
            a.time.type=V_ASN1_INTEGER;
            a.time.data=ibuf3;
            ASN1_INTEGER_set(&(a.time),in->time);
            }

      if (in->timeout != 0L)
            {
            a.timeout.length=LSIZE2;
            a.timeout.type=V_ASN1_INTEGER;
            a.timeout.data=ibuf4;
            ASN1_INTEGER_set(&(a.timeout),in->timeout);
            }

      if (in->verify_result != X509_V_OK)
            {
            a.verify_result.length=LSIZE2;
            a.verify_result.type=V_ASN1_INTEGER;
            a.verify_result.data=ibuf5;
            ASN1_INTEGER_set(&a.verify_result,in->verify_result);
            }


      M_ASN1_I2D_len(&(a.version),        i2d_ASN1_INTEGER);
      M_ASN1_I2D_len(&(a.ssl_version),    i2d_ASN1_INTEGER);
      M_ASN1_I2D_len(&(a.cipher),         i2d_ASN1_OCTET_STRING);
      M_ASN1_I2D_len(&(a.session_id),           i2d_ASN1_OCTET_STRING);
      M_ASN1_I2D_len(&(a.master_key),           i2d_ASN1_OCTET_STRING);
#ifndef OPENSSL_NO_KRB5
      if (in->krb5_client_princ_len)
            M_ASN1_I2D_len(&(a.krb5_princ),     i2d_ASN1_OCTET_STRING);
#endif /* OPENSSL_NO_KRB5 */
      if (in->key_arg_length > 0)
            M_ASN1_I2D_len_IMP_opt(&(a.key_arg),i2d_ASN1_OCTET_STRING);
      if (in->time != 0L)
            M_ASN1_I2D_len_EXP_opt(&(a.time),i2d_ASN1_INTEGER,1,v1);
      if (in->timeout != 0L)
            M_ASN1_I2D_len_EXP_opt(&(a.timeout),i2d_ASN1_INTEGER,2,v2);
      if (in->peer != NULL)
            M_ASN1_I2D_len_EXP_opt(in->peer,i2d_X509,3,v3);
      M_ASN1_I2D_len_EXP_opt(&a.session_id_context,i2d_ASN1_OCTET_STRING,4,v4);
      if (in->verify_result != X509_V_OK)
            M_ASN1_I2D_len_EXP_opt(&(a.verify_result),i2d_ASN1_INTEGER,5,v5);

      M_ASN1_I2D_seq_total();

      M_ASN1_I2D_put(&(a.version),        i2d_ASN1_INTEGER);
      M_ASN1_I2D_put(&(a.ssl_version),    i2d_ASN1_INTEGER);
      M_ASN1_I2D_put(&(a.cipher),         i2d_ASN1_OCTET_STRING);
      M_ASN1_I2D_put(&(a.session_id),           i2d_ASN1_OCTET_STRING);
      M_ASN1_I2D_put(&(a.master_key),           i2d_ASN1_OCTET_STRING);
#ifndef OPENSSL_NO_KRB5
      if (in->krb5_client_princ_len)
            M_ASN1_I2D_put(&(a.krb5_princ),     i2d_ASN1_OCTET_STRING);
#endif /* OPENSSL_NO_KRB5 */
      if (in->key_arg_length > 0)
            M_ASN1_I2D_put_IMP_opt(&(a.key_arg),i2d_ASN1_OCTET_STRING,0);
      if (in->time != 0L)
            M_ASN1_I2D_put_EXP_opt(&(a.time),i2d_ASN1_INTEGER,1,v1);
      if (in->timeout != 0L)
            M_ASN1_I2D_put_EXP_opt(&(a.timeout),i2d_ASN1_INTEGER,2,v2);
      if (in->peer != NULL)
            M_ASN1_I2D_put_EXP_opt(in->peer,i2d_X509,3,v3);
      M_ASN1_I2D_put_EXP_opt(&a.session_id_context,i2d_ASN1_OCTET_STRING,4,
                         v4);
      if (in->verify_result != X509_V_OK)
            M_ASN1_I2D_put_EXP_opt(&a.verify_result,i2d_ASN1_INTEGER,5,v5);
      M_ASN1_I2D_finish();
      }

SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, unsigned char **pp,
           long length)
      {
      int version,ssl_version=0,i;
      long id;
      ASN1_INTEGER ai,*aip;
      ASN1_OCTET_STRING os,*osp;
      M_ASN1_D2I_vars(a,SSL_SESSION *,SSL_SESSION_new);

      aip= &ai;
      osp= &os;

      M_ASN1_D2I_Init();
      M_ASN1_D2I_start_sequence();

      ai.data=NULL; ai.length=0;
      M_ASN1_D2I_get(aip,d2i_ASN1_INTEGER);
      version=(int)ASN1_INTEGER_get(aip);
      if (ai.data != NULL) { OPENSSL_free(ai.data); ai.data=NULL; ai.length=0; }

      /* we don't care about the version right now :-) */
      M_ASN1_D2I_get(aip,d2i_ASN1_INTEGER);
      ssl_version=(int)ASN1_INTEGER_get(aip);
      ret->ssl_version=ssl_version;
      if (ai.data != NULL) { OPENSSL_free(ai.data); ai.data=NULL; ai.length=0; }

      os.data=NULL; os.length=0;
      M_ASN1_D2I_get(osp,d2i_ASN1_OCTET_STRING);
      if (ssl_version == SSL2_VERSION)
            {
            if (os.length != 3)
                  {
                  c.error=SSL_R_CIPHER_CODE_WRONG_LENGTH;
                  goto err;
                  }
            id=0x02000000L|
                  ((unsigned long)os.data[0]<<16L)|
                  ((unsigned long)os.data[1]<< 8L)|
                   (unsigned long)os.data[2];
            }
      else if ((ssl_version>>8) == 3)
            {
            if (os.length != 2)
                  {
                  c.error=SSL_R_CIPHER_CODE_WRONG_LENGTH;
                  goto err;
                  }
            id=0x03000000L|
                  ((unsigned long)os.data[0]<<8L)|
                   (unsigned long)os.data[1];
            }
      else
            {
            SSLerr(SSL_F_D2I_SSL_SESSION,SSL_R_UNKNOWN_SSL_VERSION);
            return(NULL);
            }
      
      ret->cipher=NULL;
      ret->cipher_id=id;

      M_ASN1_D2I_get(osp,d2i_ASN1_OCTET_STRING);
      if ((ssl_version>>8) == SSL3_VERSION)
            i=SSL3_MAX_SSL_SESSION_ID_LENGTH;
      else /* if (ssl_version == SSL2_VERSION) */
            i=SSL2_MAX_SSL_SESSION_ID_LENGTH;

      if (os.length > i)
            os.length = i;
      if (os.length > sizeof ret->session_id) /* can't happen */
            os.length = sizeof ret->session_id;

      ret->session_id_length=os.length;
      OPENSSL_assert(os.length <= sizeof ret->session_id);
      memcpy(ret->session_id,os.data,os.length);

      M_ASN1_D2I_get(osp,d2i_ASN1_OCTET_STRING);
      if (ret->master_key_length > SSL_MAX_MASTER_KEY_LENGTH)
            ret->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
      else
            ret->master_key_length=os.length;
      memcpy(ret->master_key,os.data,ret->master_key_length);

      os.length=0;

#ifndef OPENSSL_NO_KRB5
      os.length=0;
      M_ASN1_D2I_get_opt(osp,d2i_ASN1_OCTET_STRING,V_ASN1_OCTET_STRING);
      if (os.data)
            {
            if (os.length > SSL_MAX_KRB5_PRINCIPAL_LENGTH)
                        ret->krb5_client_princ_len=0;
            else
                  ret->krb5_client_princ_len=os.length;
            memcpy(ret->krb5_client_princ,os.data,ret->krb5_client_princ_len);
            OPENSSL_free(os.data);
            os.data = NULL;
            os.length = 0;
            }
      else
            ret->krb5_client_princ_len=0;
#endif /* OPENSSL_NO_KRB5 */

      M_ASN1_D2I_get_IMP_opt(osp,d2i_ASN1_OCTET_STRING,0,V_ASN1_OCTET_STRING);
      if (os.length > SSL_MAX_KEY_ARG_LENGTH)
            ret->key_arg_length=SSL_MAX_KEY_ARG_LENGTH;
      else
            ret->key_arg_length=os.length;
      memcpy(ret->key_arg,os.data,ret->key_arg_length);
      if (os.data != NULL) OPENSSL_free(os.data);

      ai.length=0;
      M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,1);
      if (ai.data != NULL)
            {
            ret->time=ASN1_INTEGER_get(aip);
            OPENSSL_free(ai.data); ai.data=NULL; ai.length=0;
            }
      else
            ret->time=time(NULL);

      ai.length=0;
      M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,2);
      if (ai.data != NULL)
            {
            ret->timeout=ASN1_INTEGER_get(aip);
            OPENSSL_free(ai.data); ai.data=NULL; ai.length=0;
            }
      else
            ret->timeout=3;

      if (ret->peer != NULL)
            {
            X509_free(ret->peer);
            ret->peer=NULL;
            }
      M_ASN1_D2I_get_EXP_opt(ret->peer,d2i_X509,3);

      os.length=0;
      os.data=NULL;
      M_ASN1_D2I_get_EXP_opt(osp,d2i_ASN1_OCTET_STRING,4);

      if(os.data != NULL)
          {
          if (os.length > SSL_MAX_SID_CTX_LENGTH)
            {
            ret->sid_ctx_length=os.length;
            SSLerr(SSL_F_D2I_SSL_SESSION,SSL_R_BAD_LENGTH);
            }
          else
            {
            ret->sid_ctx_length=os.length;
            memcpy(ret->sid_ctx,os.data,os.length);
            }
          OPENSSL_free(os.data); os.data=NULL; os.length=0;
          }
      else
          ret->sid_ctx_length=0;

      ai.length=0;
      M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,5);
      if (ai.data != NULL)
            {
            ret->verify_result=ASN1_INTEGER_get(aip);
            OPENSSL_free(ai.data); ai.data=NULL; ai.length=0;
            }
      else
            ret->verify_result=X509_V_OK;

      M_ASN1_D2I_Finish(a,SSL_SESSION_free,SSL_F_D2I_SSL_SESSION);
      }

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