ssl/s2_lib.c

   1 /* ssl/s2_lib.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include "ssl_locl.h"
  60 #ifndef NO_SSL2
  61 #include <stdio.h>
  62 #include <openssl/rsa.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/md5.h>
  65
  66 static long ssl2_default_timeout(void );
  67 const char *ssl2_version_str="SSLv2" OPENSSL_VERSION_PTEXT;
  68
  69 #define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))
  70
  71 OPENSSL_GLOBAL SSL_CIPHER ssl2_ciphers[]={
  72 /* NULL_WITH_MD5 v3 */
  73 #if 0
  74         {
  75         1,
  76         SSL2_TXT_NULL_WITH_MD5,
  77         SSL2_CK_NULL_WITH_MD5,
  78         SSL_kRSA|SSL_aRSA|SSL_eNULL|SSL_MD5|SSL_SSLV2,
  79         SSL_EXPORT|SSL_EXP40,
  80         0,
  81         0,
  82         SSL_ALL_CIPHERS,
  83         SSL_ALL_STRENGTHS,
  84         },
  85 #endif
  86 /* RC4_128_EXPORT40_WITH_MD5 */
  87         {
  88         1,
  89         SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
  90         SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
  91         SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
  92         SSL_EXPORT|SSL_EXP40,
  93         SSL2_CF_5_BYTE_ENC,
  94         40,
  95         128,
  96         SSL_ALL_CIPHERS,
  97         SSL_ALL_STRENGTHS,
  98         },
  99 /* RC4_128_WITH_MD5 */
 100         {
 101         1,
 102         SSL2_TXT_RC4_128_WITH_MD5,
 103         SSL2_CK_RC4_128_WITH_MD5,
 104         SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
 105         SSL_NOT_EXP|SSL_MEDIUM,
 106         0,
 107         128,
 108         128,
 109         SSL_ALL_CIPHERS,
 110         SSL_ALL_STRENGTHS,
 111         },
 112 /* RC2_128_CBC_EXPORT40_WITH_MD5 */
 113         {
 114         1,
 115         SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
 116         SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
 117         SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
 118         SSL_EXPORT|SSL_EXP40,
 119         SSL2_CF_5_BYTE_ENC,
 120         40,
 121         128,
 122         SSL_ALL_CIPHERS,
 123         SSL_ALL_STRENGTHS,
 124         },
 125 /* RC2_128_CBC_WITH_MD5 */
 126         {
 127         1,
 128         SSL2_TXT_RC2_128_CBC_WITH_MD5,
 129         SSL2_CK_RC2_128_CBC_WITH_MD5,
 130         SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
 131         SSL_NOT_EXP|SSL_MEDIUM,
 132         0,
 133         128,
 134         128,
 135         SSL_ALL_CIPHERS,
 136         SSL_ALL_STRENGTHS,
 137         },
 138 /* IDEA_128_CBC_WITH_MD5 */
 139         {
 140         1,
 141         SSL2_TXT_IDEA_128_CBC_WITH_MD5,
 142         SSL2_CK_IDEA_128_CBC_WITH_MD5,
 143         SSL_kRSA|SSL_aRSA|SSL_IDEA|SSL_MD5|SSL_SSLV2,
 144         SSL_NOT_EXP|SSL_MEDIUM,
 145         0,
 146         128,
 147         128,
 148         SSL_ALL_CIPHERS,
 149         SSL_ALL_STRENGTHS,
 150         },
 151 /* DES_64_CBC_WITH_MD5 */
 152         {
 153         1,
 154         SSL2_TXT_DES_64_CBC_WITH_MD5,
 155         SSL2_CK_DES_64_CBC_WITH_MD5,
 156         SSL_kRSA|SSL_aRSA|SSL_DES|SSL_MD5|SSL_SSLV2,
 157         SSL_NOT_EXP|SSL_LOW,
 158         0,
 159         56,
 160         56,
 161         SSL_ALL_CIPHERS,
 162         SSL_ALL_STRENGTHS,
 163         },
 164 /* DES_192_EDE3_CBC_WITH_MD5 */
 165         {
 166         1,
 167         SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
 168         SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
 169         SSL_kRSA|SSL_aRSA|SSL_3DES|SSL_MD5|SSL_SSLV2,
 170         SSL_NOT_EXP|SSL_HIGH,
 171         0,
 172         168,
 173         168,
 174         SSL_ALL_CIPHERS,
 175         SSL_ALL_STRENGTHS,
 176         },
 177 /* RC4_64_WITH_MD5 */
 178 #if 1
 179         {
 180         1,
 181         SSL2_TXT_RC4_64_WITH_MD5,
 182         SSL2_CK_RC4_64_WITH_MD5,
 183         SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
 184         SSL_NOT_EXP|SSL_LOW,
 185         SSL2_CF_8_BYTE_ENC,
 186         64,
 187         64,
 188         SSL_ALL_CIPHERS,
 189         SSL_ALL_STRENGTHS,
 190         },
 191 #endif
 192 /* NULL SSLeay (testing) */
 193 #if 0
 194         {
 195         0,
 196         SSL2_TXT_NULL,
 197         SSL2_CK_NULL,
 198         0,
 199         0,
 200         0,
 201         0,
 202         SSL_ALL_CIPHERS,
 203         SSL_ALL_STRENGTHS,
 204         },
 205 #endif
 206
 207 /* end of list :-) */
 208         };
 209
 210 static SSL_METHOD SSLv2_data= {
 211         SSL2_VERSION,
 212         ssl2_new,       /* local */
 213         ssl2_clear,     /* local */
 214         ssl2_free,      /* local */
 215         ssl_undefined_function,
 216         ssl_undefined_function,
 217         ssl2_read,
 218         ssl2_peek,
 219         ssl2_write,
 220         ssl2_shutdown,
 221         ssl_ok, /* NULL - renegotiate */
 222         ssl_ok, /* NULL - check renegotiate */
 223         ssl2_ctrl,      /* local */
 224         ssl2_ctx_ctrl,  /* local */
 225         ssl2_get_cipher_by_char,
 226         ssl2_put_cipher_by_char,
 227         ssl2_pending,
 228         ssl2_num_ciphers,
 229         ssl2_get_cipher,
 230         ssl_bad_method,
 231         ssl2_default_timeout,
 232         &ssl3_undef_enc_method,
 233         ssl_undefined_function,
 234         ssl2_callback_ctrl,     /* local */
 235         ssl2_ctx_callback_ctrl, /* local */
 236         };
 237
 238 static long ssl2_default_timeout(void)
 239         {
 240         return(300);
 241         }
 242
 243 SSL_METHOD *sslv2_base_method(void)
 244         {
 245         return(&SSLv2_data);
 246         }
 247
 248 int ssl2_num_ciphers(void)
 249         {
 250         return(SSL2_NUM_CIPHERS);
 251         }
 252
 253 SSL_CIPHER *ssl2_get_cipher(unsigned int u)
 254         {
 255         if (u < SSL2_NUM_CIPHERS)
 256                 return(&(ssl2_ciphers[SSL2_NUM_CIPHERS-1-u]));
 257         else
 258                 return(NULL);
 259         }
 260
 261 int ssl2_pending(SSL *s)
 262         {
 263         return(s->s2->ract_data_length);
 264         }
 265
 266 int ssl2_new(SSL *s)
 267         {
 268         SSL2_STATE *s2;
 269
 270         if ((s2=OPENSSL_malloc(sizeof *s2)) == NULL) goto err;
 271         memset(s2,0,sizeof *s2);
 272
 273         if ((s2->rbuf=OPENSSL_malloc(
 274                 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err;
 275         if ((s2->wbuf=OPENSSL_malloc(
 276                 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err;
 277         s->s2=s2;
 278
 279         ssl2_clear(s);
 280         return(1);
 281 err:
 282         if (s2 != NULL)
 283                 {
 284                 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
 285                 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
 286                 OPENSSL_free(s2);
 287                 }
 288         return(0);
 289         }
 290
 291 void ssl2_free(SSL *s)
 292         {
 293         SSL2_STATE *s2;
 294
 295         if(s == NULL)
 296             return;
 297
 298         s2=s->s2;
 299         if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
 300         if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
 301         memset(s2,0,sizeof *s2);
 302         OPENSSL_free(s2);
 303         s->s2=NULL;
 304         }
 305
 306 void ssl2_clear(SSL *s)
 307         {
 308         SSL2_STATE *s2;
 309         unsigned char *rbuf,*wbuf;
 310
 311         s2=s->s2;
 312
 313         rbuf=s2->rbuf;
 314         wbuf=s2->wbuf;
 315
 316         memset(s2,0,sizeof *s2);
 317
 318         s2->rbuf=rbuf;
 319         s2->wbuf=wbuf;
 320         s2->clear_text=1;
 321         s->packet=s2->rbuf;
 322         s->version=SSL2_VERSION;
 323         s->packet_length=0;
 324         }
 325
 326 long ssl2_ctrl(SSL *s, int cmd, long larg, char *parg)
 327         {
 328         int ret=0;
 329
 330         switch(cmd)
 331                 {
 332         case SSL_CTRL_GET_SESSION_REUSED:
 333                 ret=s->hit;
 334                 break;
 335         default:
 336                 break;
 337                 }
 338         return(ret);
 339         }
 340
 341 long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp)())
 342         {
 343         return(0);
 344         }
 345
 346 long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, char *parg)
 347         {
 348         return(0);
 349         }
 350
 351 long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)())
 352         {
 353         return(0);
 354         }
 355
 356 /* This function needs to check if the ciphers required are actually
 357  * available */
 358 SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
 359         {
 360         static int init=1;
 361         static SSL_CIPHER *sorted[SSL2_NUM_CIPHERS];
 362         SSL_CIPHER c,*cp= &c,**cpp;
 363         unsigned long id;
 364         int i;
 365
 366         if (init)
 367                 {
 368                 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
 369
 370                 for (i=0; i<SSL2_NUM_CIPHERS; i++)
 371                         sorted[i]= &(ssl2_ciphers[i]);
 372
 373                 qsort(  (char *)sorted,
 374                         SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *),
 375                         FP_ICC ssl_cipher_ptr_id_cmp);
 376
 377                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
 378                 init=0;
 379                 }
 380
 381         id=0x02000000L|((unsigned long)p[0]<<16L)|
 382                 ((unsigned long)p[1]<<8L)|(unsigned long)p[2];
 383         c.id=id;
 384         cpp=(SSL_CIPHER **)OBJ_bsearch((char *)&cp,
 385                 (char *)sorted,
 386                 SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *),
 387                 FP_ICC ssl_cipher_ptr_id_cmp);
 388         if ((cpp == NULL) || !(*cpp)->valid)
 389                 return(NULL);
 390         else
 391                 return(*cpp);
 392         }
 393
 394 int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
 395         {
 396         long l;
 397
 398         if (p != NULL)
 399                 {
 400                 l=c->id;
 401                 if ((l & 0xff000000) != 0x02000000) return(0);
 402                 p[0]=((unsigned char)(l>>16L))&0xFF;
 403                 p[1]=((unsigned char)(l>> 8L))&0xFF;
 404                 p[2]=((unsigned char)(l     ))&0xFF;
 405                 }
 406         return(3);
 407         }
 408
 409 void ssl2_generate_key_material(SSL *s)
 410         {
 411         unsigned int i;
 412         MD5_CTX ctx;
 413         unsigned char *km;
 414         unsigned char c='0';
 415
 416 #ifdef CHARSET_EBCDIC
 417         c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0',
 418                                 see SSLv2 docu */
 419 #endif
 420
 421         km=s->s2->key_material;
 422         for (i=0; i<s->s2->key_material_length; i+=MD5_DIGEST_LENGTH)
 423                 {
 424                 MD5_Init(&ctx);
 425
 426                 MD5_Update(&ctx,s->session->master_key,s->session->master_key_length);
 427                 MD5_Update(&ctx,&c,1);
 428                 c++;
 429                 MD5_Update(&ctx,s->s2->challenge,s->s2->challenge_length);
 430                 MD5_Update(&ctx,s->s2->conn_id,s->s2->conn_id_length);
 431                 MD5_Final(km,&ctx);
 432                 km+=MD5_DIGEST_LENGTH;
 433                 }
 434         }
 435
 436 void ssl2_return_error(SSL *s, int err)
 437         {
 438         if (!s->error)
 439                 {
 440                 s->error=3;
 441                 s->error_code=err;
 442
 443                 ssl2_write_error(s);
 444                 }
 445         }
 446
 447
 448 void ssl2_write_error(SSL *s)
 449         {
 450         unsigned char buf[3];
 451         int i,error;
 452
 453         buf[0]=SSL2_MT_ERROR;
 454         buf[1]=(s->error_code>>8)&0xff;
 455         buf[2]=(s->error_code)&0xff;
 456
 457 /*      state=s->rwstate;*/
 458         error=s->error;
 459         s->error=0;
 460         i=ssl2_write(s,&(buf[3-error]),error);
 461 /*      if (i == error) s->rwstate=state; */
 462
 463         if (i < 0)
 464                 s->error=error;
 465         else if (i != s->error)
 466                 s->error=error-i;
 467         /* else
 468                 s->error=0; */
 469         }
 470
 471 int ssl2_shutdown(SSL *s)
 472         {
 473         s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
 474         return(1);
 475         }
 476 #else /* !NO_SSL2 */
 477
 478 # if PEDANTIC
 479 static void *dummy=&dummy;
 480 # endif
 481
 482 #endif