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  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include "ssl_locl.h"
 113 #ifndef OPENSSL_NO_SSL2
 114 #include <stdio.h>
 115 #include <openssl/objects.h>
 116 #include <openssl/evp.h>
 117 #include <openssl/md5.h>
 118
 119 const char ssl2_version_str[]="SSLv2" OPENSSL_VERSION_PTEXT;
 120
 121 #define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))
 122
 123 /* list of available SSLv2 ciphers (sorted by id) */
 124 OPENSSL_GLOBAL const SSL_CIPHER ssl2_ciphers[]={
 125 #if 0
 126 /* NULL_WITH_MD5 v3 */
 127         {
 128         1,
 129         SSL2_TXT_NULL_WITH_MD5,
 130         SSL2_CK_NULL_WITH_MD5,
 131         SSL_kRSA,
 132         SSL_aRSA,
 133         SSL_eNULL,
 134         SSL_MD5,
 135         SSL_SSLV2,
 136         SSL_EXPORT|SSL_EXP40|SSL_STRONG_NONE,
 137         0,
 138         0,
 139         0,
 140         },
 141 #endif
 142
 143 /* RC4_128_WITH_MD5 */
 144         {
 145         1,
 146         SSL2_TXT_RC4_128_WITH_MD5,
 147         SSL2_CK_RC4_128_WITH_MD5,
 148         SSL_kRSA,
 149         SSL_aRSA,
 150         SSL_RC4,
 151         SSL_MD5,
 152         SSL_SSLV2,
 153         SSL_NOT_EXP|SSL_MEDIUM,
 154         0,
 155         128,
 156         128,
 157         },
 158
 159 /* RC4_128_EXPORT40_WITH_MD5 */
 160         {
 161         1,
 162         SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
 163         SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
 164         SSL_kRSA,
 165         SSL_aRSA,
 166         SSL_RC4,
 167         SSL_MD5,
 168         SSL_SSLV2,
 169         SSL_EXPORT|SSL_EXP40,
 170         SSL2_CF_5_BYTE_ENC,
 171         40,
 172         128,
 173         },
 174
 175 /* RC2_128_CBC_WITH_MD5 */
 176         {
 177         1,
 178         SSL2_TXT_RC2_128_CBC_WITH_MD5,
 179         SSL2_CK_RC2_128_CBC_WITH_MD5,
 180         SSL_kRSA,
 181         SSL_aRSA,
 182         SSL_RC2,
 183         SSL_MD5,
 184         SSL_SSLV2,
 185         SSL_NOT_EXP|SSL_MEDIUM,
 186         0,
 187         128,
 188         128,
 189         },
 190
 191 /* RC2_128_CBC_EXPORT40_WITH_MD5 */
 192         {
 193         1,
 194         SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
 195         SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
 196         SSL_kRSA,
 197         SSL_aRSA,
 198         SSL_RC2,
 199         SSL_MD5,
 200         SSL_SSLV2,
 201         SSL_EXPORT|SSL_EXP40,
 202         SSL2_CF_5_BYTE_ENC,
 203         40,
 204         128,
 205         },
 206
 207 #ifndef OPENSSL_NO_IDEA
 208 /* IDEA_128_CBC_WITH_MD5 */
 209         {
 210         1,
 211         SSL2_TXT_IDEA_128_CBC_WITH_MD5,
 212         SSL2_CK_IDEA_128_CBC_WITH_MD5,
 213         SSL_kRSA,
 214         SSL_aRSA,
 215         SSL_IDEA,
 216         SSL_MD5,
 217         SSL_SSLV2,
 218         SSL_NOT_EXP|SSL_MEDIUM,
 219         0,
 220         128,
 221         128,
 222         },
 223 #endif
 224
 225 /* DES_64_CBC_WITH_MD5 */
 226         {
 227         1,
 228         SSL2_TXT_DES_64_CBC_WITH_MD5,
 229         SSL2_CK_DES_64_CBC_WITH_MD5,
 230         SSL_kRSA,
 231         SSL_aRSA,
 232         SSL_DES,
 233         SSL_MD5,
 234         SSL_SSLV2,
 235         SSL_NOT_EXP|SSL_LOW,
 236         0,
 237         56,
 238         56,
 239         },
 240
 241 /* DES_192_EDE3_CBC_WITH_MD5 */
 242         {
 243         1,
 244         SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
 245         SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
 246         SSL_kRSA,
 247         SSL_aRSA,
 248         SSL_3DES,
 249         SSL_MD5,
 250         SSL_SSLV2,
 251         SSL_NOT_EXP|SSL_HIGH,
 252         0,
 253         112,
 254         168,
 255         },
 256
 257 #if 0
 258 /* RC4_64_WITH_MD5 */
 259         {
 260         1,
 261         SSL2_TXT_RC4_64_WITH_MD5,
 262         SSL2_CK_RC4_64_WITH_MD5,
 263         SSL_kRSA,
 264         SSL_aRSA,
 265         SSL_RC4,
 266         SSL_MD5,
 267         SSL_SSLV2,
 268         SSL_NOT_EXP|SSL_LOW,
 269         SSL2_CF_8_BYTE_ENC,
 270         64,
 271         64,
 272         },
 273 #endif
 274
 275 #if 0
 276 /* NULL SSLeay (testing) */
 277         {
 278         0,
 279         SSL2_TXT_NULL,
 280         SSL2_CK_NULL,
 281         0,
 282         0,
 283         0,
 284         0,
 285         SSL_SSLV2,
 286         SSL_STRONG_NONE,
 287         0,
 288         0,
 289         0,
 290         },
 291 #endif
 292
 293 /* end of list :-) */
 294         };
 295
 296 long ssl2_default_timeout(void)
 297         {
 298         return(300);
 299         }
 300
 301 int ssl2_num_ciphers(void)
 302         {
 303         return(SSL2_NUM_CIPHERS);
 304         }
 305
 306 const SSL_CIPHER *ssl2_get_cipher(unsigned int u)
 307         {
 308         if (u < SSL2_NUM_CIPHERS)
 309                 return(&(ssl2_ciphers[SSL2_NUM_CIPHERS-1-u]));
 310         else
 311                 return(NULL);
 312         }
 313
 314 int ssl2_pending(const SSL *s)
 315         {
 316         return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
 317         }
 318
 319 int ssl2_new(SSL *s)
 320         {
 321         SSL2_STATE *s2;
 322
 323         if ((s2=OPENSSL_malloc(sizeof *s2)) == NULL) goto err;
 324         memset(s2,0,sizeof *s2);
 325
 326 #if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
 327 #  error "assertion failed"
 328 #endif
 329
 330         if ((s2->rbuf=OPENSSL_malloc(
 331                 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err;
 332         /* wbuf needs one byte more because when using two-byte headers,
 333          * we leave the first byte unused in do_ssl_write (s2_pkt.c) */
 334         if ((s2->wbuf=OPENSSL_malloc(
 335                 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+3)) == NULL) goto err;
 336         s->s2=s2;
 337
 338         ssl2_clear(s);
 339         return(1);
 340 err:
 341         if (s2 != NULL)
 342                 {
 343                 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
 344                 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
 345                 OPENSSL_free(s2);
 346                 }
 347         return(0);
 348         }
 349
 350 void ssl2_free(SSL *s)
 351         {
 352         SSL2_STATE *s2;
 353
 354         if(s == NULL)
 355             return;
 356
 357         s2=s->s2;
 358         if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
 359         if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
 360         OPENSSL_cleanse(s2,sizeof *s2);
 361         OPENSSL_free(s2);
 362         s->s2=NULL;
 363         }
 364
 365 void ssl2_clear(SSL *s)
 366         {
 367         SSL2_STATE *s2;
 368         unsigned char *rbuf,*wbuf;
 369
 370         s2=s->s2;
 371
 372         rbuf=s2->rbuf;
 373         wbuf=s2->wbuf;
 374
 375         memset(s2,0,sizeof *s2);
 376
 377         s2->rbuf=rbuf;
 378         s2->wbuf=wbuf;
 379         s2->clear_text=1;
 380         s->packet=s2->rbuf;
 381         s->version=SSL2_VERSION;
 382         s->packet_length=0;
 383         }
 384
 385 long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
 386         {
 387         int ret=0;
 388
 389         switch(cmd)
 390                 {
 391         case SSL_CTRL_GET_SESSION_REUSED:
 392                 ret=s->hit;
 393                 break;
 394         case SSL_CTRL_CHECK_PROTO_VERSION:
 395                 return ssl3_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, larg, parg);
 396         default:
 397                 break;
 398                 }
 399         return(ret);
 400         }
 401
 402 long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp)(void))
 403         {
 404         return(0);
 405         }
 406
 407 long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
 408         {
 409         return(0);
 410         }
 411
 412 long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)(void))
 413         {
 414         return(0);
 415         }
 416
 417 /* This function needs to check if the ciphers required are actually
 418  * available */
 419 const SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
 420         {
 421         SSL_CIPHER c;
 422         const SSL_CIPHER *cp;
 423         unsigned long id;
 424
 425         id=0x02000000L|((unsigned long)p[0]<<16L)|
 426                 ((unsigned long)p[1]<<8L)|(unsigned long)p[2];
 427         c.id=id;
 428         cp = OBJ_bsearch_ssl_cipher_id(&c, ssl2_ciphers, SSL2_NUM_CIPHERS);
 429         return cp;
 430         }
 431
 432 int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
 433         {
 434         long l;
 435
 436         if (p != NULL)
 437                 {
 438                 l=c->id;
 439                 if ((l & 0xff000000) != 0x02000000 && l != SSL3_CK_FALLBACK_SCSV) return(0);
 440                 p[0]=((unsigned char)(l>>16L))&0xFF;
 441                 p[1]=((unsigned char)(l>> 8L))&0xFF;
 442                 p[2]=((unsigned char)(l     ))&0xFF;
 443                 }
 444         return(3);
 445         }
 446
 447 int ssl2_generate_key_material(SSL *s)
 448         {
 449         unsigned int i;
 450         EVP_MD_CTX ctx;
 451         unsigned char *km;
 452         unsigned char c='0';
 453         const EVP_MD *md5;
 454         int md_size;
 455
 456         md5 = EVP_md5();
 457
 458 #ifdef CHARSET_EBCDIC
 459         c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0',
 460                                 see SSLv2 docu */
 461 #endif
 462         EVP_MD_CTX_init(&ctx);
 463         km=s->s2->key_material;
 464
 465         if (s->session->master_key_length < 0 ||
 466                         s->session->master_key_length > (int)sizeof(s->session->master_key))
 467                 {
 468                 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 469                 return 0;
 470                 }
 471         md_size = EVP_MD_size(md5);
 472         if (md_size < 0)
 473             return 0;
 474         for (i=0; i<s->s2->key_material_length; i += md_size)
 475                 {
 476                 if (((km - s->s2->key_material) + md_size) >
 477                                 (int)sizeof(s->s2->key_material))
 478                         {
 479                         /* EVP_DigestFinal_ex() below would write beyond buffer */
 480                         SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 481                         return 0;
 482                         }
 483
 484                 EVP_DigestInit_ex(&ctx, md5, NULL);
 485
 486                 OPENSSL_assert(s->session->master_key_length >= 0
 487                     && s->session->master_key_length
 488                     < (int)sizeof(s->session->master_key));
 489                 EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length);
 490                 EVP_DigestUpdate(&ctx,&c,1);
 491                 c++;
 492                 EVP_DigestUpdate(&ctx,s->s2->challenge,s->s2->challenge_length);
 493                 EVP_DigestUpdate(&ctx,s->s2->conn_id,s->s2->conn_id_length);
 494                 EVP_DigestFinal_ex(&ctx,km,NULL);
 495                 km += md_size;
 496                 }
 497
 498         EVP_MD_CTX_cleanup(&ctx);
 499         return 1;
 500         }
 501
 502 void ssl2_return_error(SSL *s, int err)
 503         {
 504         if (!s->error)
 505                 {
 506                 s->error=3;
 507                 s->error_code=err;
 508
 509                 ssl2_write_error(s);
 510                 }
 511         }
 512
 513
 514 void ssl2_write_error(SSL *s)
 515         {
 516         unsigned char buf[3];
 517         int i,error;
 518
 519         buf[0]=SSL2_MT_ERROR;
 520         buf[1]=(s->error_code>>8)&0xff;
 521         buf[2]=(s->error_code)&0xff;
 522
 523 /*      state=s->rwstate;*/
 524
 525         error=s->error; /* number of bytes left to write */
 526         s->error=0;
 527         OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
 528         i=ssl2_write(s,&(buf[3-error]),error);
 529
 530 /*      if (i == error) s->rwstate=state; */
 531
 532         if (i < 0)
 533                 s->error=error;
 534         else
 535                 {
 536                 s->error=error-i;
 537
 538                 if (s->error == 0)
 539                         if (s->msg_callback)
 540                                 s->msg_callback(1, s->version, 0, buf, 3, s, s->msg_callback_arg); /* ERROR */
 541                 }
 542         }
 543
 544 int ssl2_shutdown(SSL *s)
 545         {
 546         s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
 547         return(1);
 548         }
 549 #else /* !OPENSSL_NO_SSL2 */
 550
 551 # if PEDANTIC
 552 static void *dummy=&dummy;
 553 # endif
 554
 555 #endif