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_DEFAULT | SSL_NOT_EXP | SSL_MEDIUM,
 154      0,
 155      128,
 156      128,
 157      },
 158
 159 # if 0
 160 /* RC4_128_EXPORT40_WITH_MD5 */
 161     {
 162      1,
 163      SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
 164      SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
 165      SSL_kRSA,
 166      SSL_aRSA,
 167      SSL_RC4,
 168      SSL_MD5,
 169      SSL_SSLV2,
 170      SSL_NOT_DEFAULT | SSL_EXPORT | SSL_EXP40,
 171      SSL2_CF_5_BYTE_ENC,
 172      40,
 173      128,
 174      },
 175 # endif
 176
 177 /* RC2_128_CBC_WITH_MD5 */
 178     {
 179      1,
 180      SSL2_TXT_RC2_128_CBC_WITH_MD5,
 181      SSL2_CK_RC2_128_CBC_WITH_MD5,
 182      SSL_kRSA,
 183      SSL_aRSA,
 184      SSL_RC2,
 185      SSL_MD5,
 186      SSL_SSLV2,
 187      SSL_NOT_DEFAULT | SSL_NOT_EXP | SSL_MEDIUM,
 188      0,
 189      128,
 190      128,
 191      },
 192
 193 # if 0
 194 /* RC2_128_CBC_EXPORT40_WITH_MD5 */
 195     {
 196      1,
 197      SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
 198      SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
 199      SSL_kRSA,
 200      SSL_aRSA,
 201      SSL_RC2,
 202      SSL_MD5,
 203      SSL_SSLV2,
 204      SSL_NOT_DEFAULT | SSL_EXPORT | SSL_EXP40,
 205      SSL2_CF_5_BYTE_ENC,
 206      40,
 207      128,
 208      },
 209 # endif
 210
 211 # ifndef OPENSSL_NO_IDEA
 212 /* IDEA_128_CBC_WITH_MD5 */
 213     {
 214      1,
 215      SSL2_TXT_IDEA_128_CBC_WITH_MD5,
 216      SSL2_CK_IDEA_128_CBC_WITH_MD5,
 217      SSL_kRSA,
 218      SSL_aRSA,
 219      SSL_IDEA,
 220      SSL_MD5,
 221      SSL_SSLV2,
 222      SSL_NOT_DEFAULT | SSL_NOT_EXP | SSL_MEDIUM,
 223      0,
 224      128,
 225      128,
 226      },
 227 # endif
 228
 229 # if 0
 230 /* DES_64_CBC_WITH_MD5 */
 231     {
 232      1,
 233      SSL2_TXT_DES_64_CBC_WITH_MD5,
 234      SSL2_CK_DES_64_CBC_WITH_MD5,
 235      SSL_kRSA,
 236      SSL_aRSA,
 237      SSL_DES,
 238      SSL_MD5,
 239      SSL_SSLV2,
 240      SSL_NOT_DEFAULT | SSL_NOT_EXP | SSL_LOW,
 241      0,
 242      56,
 243      56,
 244      },
 245 # endif
 246
 247 /* DES_192_EDE3_CBC_WITH_MD5 */
 248     {
 249      1,
 250      SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
 251      SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
 252      SSL_kRSA,
 253      SSL_aRSA,
 254      SSL_3DES,
 255      SSL_MD5,
 256      SSL_SSLV2,
 257      SSL_NOT_DEFAULT | SSL_NOT_EXP | SSL_HIGH,
 258      0,
 259      112,
 260      168,
 261      },
 262
 263 # if 0
 264 /* RC4_64_WITH_MD5 */
 265     {
 266      1,
 267      SSL2_TXT_RC4_64_WITH_MD5,
 268      SSL2_CK_RC4_64_WITH_MD5,
 269      SSL_kRSA,
 270      SSL_aRSA,
 271      SSL_RC4,
 272      SSL_MD5,
 273      SSL_SSLV2,
 274      SSL_NOT_DEFAULT | SSL_NOT_EXP | SSL_LOW,
 275      SSL2_CF_8_BYTE_ENC,
 276      64,
 277      64,
 278      },
 279 # endif
 280
 281 # if 0
 282 /* NULL SSLeay (testing) */
 283     {
 284      0,
 285      SSL2_TXT_NULL,
 286      SSL2_CK_NULL,
 287      0,
 288      0,
 289      0,
 290      0,
 291      SSL_SSLV2,
 292      SSL_STRONG_NONE,
 293      0,
 294      0,
 295      0,
 296      },
 297 # endif
 298
 299 /* end of list :-) */
 300 };
 301
 302 long ssl2_default_timeout(void)
 303 {
 304     return (300);
 305 }
 306
 307 int ssl2_num_ciphers(void)
 308 {
 309     return (SSL2_NUM_CIPHERS);
 310 }
 311
 312 const SSL_CIPHER *ssl2_get_cipher(unsigned int u)
 313 {
 314     if (u < SSL2_NUM_CIPHERS)
 315         return (&(ssl2_ciphers[SSL2_NUM_CIPHERS - 1 - u]));
 316     else
 317         return (NULL);
 318 }
 319
 320 int ssl2_pending(const SSL *s)
 321 {
 322     return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
 323 }
 324
 325 int ssl2_new(SSL *s)
 326 {
 327     SSL2_STATE *s2;
 328
 329     if ((s2 = OPENSSL_malloc(sizeof *s2)) == NULL)
 330         goto err;
 331     memset(s2, 0, sizeof *s2);
 332
 333 # if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
 334 #  error "assertion failed"
 335 # endif
 336
 337     if ((s2->rbuf =
 338          OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2)) == NULL)
 339         goto err;
 340     /*
 341      * wbuf needs one byte more because when using two-byte headers, we leave
 342      * the first byte unused in do_ssl_write (s2_pkt.c)
 343      */
 344     if ((s2->wbuf =
 345          OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 3)) == NULL)
 346         goto err;
 347     s->s2 = s2;
 348
 349     ssl2_clear(s);
 350     return (1);
 351  err:
 352     if (s2 != NULL) {
 353         if (s2->wbuf != NULL)
 354             OPENSSL_free(s2->wbuf);
 355         if (s2->rbuf != NULL)
 356             OPENSSL_free(s2->rbuf);
 357         OPENSSL_free(s2);
 358     }
 359     return (0);
 360 }
 361
 362 void ssl2_free(SSL *s)
 363 {
 364     SSL2_STATE *s2;
 365
 366     if (s == NULL)
 367         return;
 368
 369     s2 = s->s2;
 370     if (s2->rbuf != NULL)
 371         OPENSSL_free(s2->rbuf);
 372     if (s2->wbuf != NULL)
 373         OPENSSL_free(s2->wbuf);
 374     OPENSSL_cleanse(s2, sizeof *s2);
 375     OPENSSL_free(s2);
 376     s->s2 = NULL;
 377 }
 378
 379 void ssl2_clear(SSL *s)
 380 {
 381     SSL2_STATE *s2;
 382     unsigned char *rbuf, *wbuf;
 383
 384     s2 = s->s2;
 385
 386     rbuf = s2->rbuf;
 387     wbuf = s2->wbuf;
 388
 389     memset(s2, 0, sizeof *s2);
 390
 391     s2->rbuf = rbuf;
 392     s2->wbuf = wbuf;
 393     s2->clear_text = 1;
 394     s->packet = s2->rbuf;
 395     s->version = SSL2_VERSION;
 396     s->packet_length = 0;
 397 }
 398
 399 long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
 400 {
 401     int ret = 0;
 402
 403     switch (cmd) {
 404     case SSL_CTRL_GET_SESSION_REUSED:
 405         ret = s->hit;
 406         break;
 407     case SSL_CTRL_CHECK_PROTO_VERSION:
 408         return ssl3_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, larg, parg);
 409     default:
 410         break;
 411     }
 412     return (ret);
 413 }
 414
 415 long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
 416 {
 417     return (0);
 418 }
 419
 420 long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
 421 {
 422     return (0);
 423 }
 424
 425 long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
 426 {
 427     return (0);
 428 }
 429
 430 /*
 431  * This function needs to check if the ciphers required are actually
 432  * available
 433  */
 434 const SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
 435 {
 436     SSL_CIPHER c;
 437     const SSL_CIPHER *cp;
 438     unsigned long id;
 439
 440     id = 0x02000000L | ((unsigned long)p[0] << 16L) |
 441         ((unsigned long)p[1] << 8L) | (unsigned long)p[2];
 442     c.id = id;
 443     cp = OBJ_bsearch_ssl_cipher_id(&c, ssl2_ciphers, SSL2_NUM_CIPHERS);
 444     if ((cp == NULL) || (cp->valid == 0))
 445         return NULL;
 446     else
 447         return cp;
 448 }
 449
 450 int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
 451 {
 452     long l;
 453
 454     if (p != NULL) {
 455         l = c->id;
 456         if ((l & 0xff000000) != 0x02000000 && l != SSL3_CK_FALLBACK_SCSV)
 457             return (0);
 458         p[0] = ((unsigned char)(l >> 16L)) & 0xFF;
 459         p[1] = ((unsigned char)(l >> 8L)) & 0xFF;
 460         p[2] = ((unsigned char)(l)) & 0xFF;
 461     }
 462     return (3);
 463 }
 464
 465 int ssl2_generate_key_material(SSL *s)
 466 {
 467     unsigned int i;
 468     EVP_MD_CTX ctx;
 469     unsigned char *km;
 470     unsigned char c = '0';
 471     const EVP_MD *md5;
 472     int md_size;
 473
 474     md5 = EVP_md5();
 475
 476 # ifdef CHARSET_EBCDIC
 477     c = os_toascii['0'];        /* Must be an ASCII '0', not EBCDIC '0', see
 478                                  * SSLv2 docu */
 479 # endif
 480     EVP_MD_CTX_init(&ctx);
 481     km = s->s2->key_material;
 482
 483     if (s->session->master_key_length < 0 ||
 484         s->session->master_key_length > (int)sizeof(s->session->master_key)) {
 485         SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 486         return 0;
 487     }
 488     md_size = EVP_MD_size(md5);
 489     if (md_size < 0)
 490         return 0;
 491     for (i = 0; i < s->s2->key_material_length; i += md_size) {
 492         if (((km - s->s2->key_material) + md_size) >
 493             (int)sizeof(s->s2->key_material)) {
 494             /*
 495              * EVP_DigestFinal_ex() below would write beyond buffer
 496              */
 497             SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 498             return 0;
 499         }
 500
 501         EVP_DigestInit_ex(&ctx, md5, NULL);
 502
 503         OPENSSL_assert(s->session->master_key_length >= 0
 504                        && s->session->master_key_length
 505                        <= (int)sizeof(s->session->master_key));
 506         EVP_DigestUpdate(&ctx, s->session->master_key,
 507                          s->session->master_key_length);
 508         EVP_DigestUpdate(&ctx, &c, 1);
 509         c++;
 510         EVP_DigestUpdate(&ctx, s->s2->challenge, s->s2->challenge_length);
 511         EVP_DigestUpdate(&ctx, s->s2->conn_id, s->s2->conn_id_length);
 512         EVP_DigestFinal_ex(&ctx, km, NULL);
 513         km += md_size;
 514     }
 515
 516     EVP_MD_CTX_cleanup(&ctx);
 517     return 1;
 518 }
 519
 520 void ssl2_return_error(SSL *s, int err)
 521 {
 522     if (!s->error) {
 523         s->error = 3;
 524         s->error_code = err;
 525
 526         ssl2_write_error(s);
 527     }
 528 }
 529
 530 void ssl2_write_error(SSL *s)
 531 {
 532     unsigned char buf[3];
 533     int i, error;
 534
 535     buf[0] = SSL2_MT_ERROR;
 536     buf[1] = (s->error_code >> 8) & 0xff;
 537     buf[2] = (s->error_code) & 0xff;
 538
 539 /*      state=s->rwstate;*/
 540
 541     error = s->error;           /* number of bytes left to write */
 542     s->error = 0;
 543     OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
 544     i = ssl2_write(s, &(buf[3 - error]), error);
 545
 546 /*      if (i == error) s->rwstate=state; */
 547
 548     if (i < 0)
 549         s->error = error;
 550     else {
 551         s->error = error - i;
 552
 553         if (s->error == 0)
 554             if (s->msg_callback) {
 555                 /* ERROR */
 556                 s->msg_callback(1, s->version, 0, buf, 3, s,
 557                                 s->msg_callback_arg);
 558             }
 559     }
 560 }
 561
 562 int ssl2_shutdown(SSL *s)
 563 {
 564     s->shutdown = (SSL_SENT_SHUTDOWN | SSL_RECEIVED_SHUTDOWN);
 565     return (1);
 566 }
 567 #else                           /* !OPENSSL_NO_SSL2 */
 568
 569 # if PEDANTIC
 570 static void *dummy = &dummy;
 571 # endif
 572
 573 #endif