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 OPENSSL_NO_SSL2
  61 # include <stdio.h>
  62 # include <openssl/objects.h>
  63 # include <openssl/evp.h>
  64 # include <openssl/md5.h>
  65
  66 const char ssl2_version_str[] = "SSLv2" OPENSSL_VERSION_PTEXT;
  67
  68 # define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))
  69
  70 /* list of available SSLv2 ciphers (sorted by id) */
  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 | SSL_STRONG_NONE,
  80      0,
  81      0,
  82      0,
  83      SSL_ALL_CIPHERS,
  84      SSL_ALL_STRENGTHS,
  85      },
  86 # endif
  87 /* RC4_128_WITH_MD5 */
  88     {
  89      1,
  90      SSL2_TXT_RC4_128_WITH_MD5,
  91      SSL2_CK_RC4_128_WITH_MD5,
  92      SSL_kRSA | SSL_aRSA | SSL_RC4 | SSL_MD5 | SSL_SSLV2,
  93      SSL_NOT_EXP | SSL_MEDIUM,
  94      0,
  95      128,
  96      128,
  97      SSL_ALL_CIPHERS,
  98      SSL_ALL_STRENGTHS,
  99      },
 100 /* RC4_128_EXPORT40_WITH_MD5 */
 101     {
 102      1,
 103      SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
 104      SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
 105      SSL_kRSA | SSL_aRSA | SSL_RC4 | SSL_MD5 | SSL_SSLV2,
 106      SSL_EXPORT | SSL_EXP40,
 107      SSL2_CF_5_BYTE_ENC,
 108      40,
 109      128,
 110      SSL_ALL_CIPHERS,
 111      SSL_ALL_STRENGTHS,
 112      },
 113 /* RC2_128_CBC_WITH_MD5 */
 114     {
 115      1,
 116      SSL2_TXT_RC2_128_CBC_WITH_MD5,
 117      SSL2_CK_RC2_128_CBC_WITH_MD5,
 118      SSL_kRSA | SSL_aRSA | SSL_RC2 | SSL_MD5 | SSL_SSLV2,
 119      SSL_NOT_EXP | SSL_MEDIUM,
 120      0,
 121      128,
 122      128,
 123      SSL_ALL_CIPHERS,
 124      SSL_ALL_STRENGTHS,
 125      },
 126 /* RC2_128_CBC_EXPORT40_WITH_MD5 */
 127     {
 128      1,
 129      SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
 130      SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
 131      SSL_kRSA | SSL_aRSA | SSL_RC2 | SSL_MD5 | SSL_SSLV2,
 132      SSL_EXPORT | SSL_EXP40,
 133      SSL2_CF_5_BYTE_ENC,
 134      40,
 135      128,
 136      SSL_ALL_CIPHERS,
 137      SSL_ALL_STRENGTHS,
 138      },
 139 /* IDEA_128_CBC_WITH_MD5 */
 140 # ifndef OPENSSL_NO_IDEA
 141     {
 142      1,
 143      SSL2_TXT_IDEA_128_CBC_WITH_MD5,
 144      SSL2_CK_IDEA_128_CBC_WITH_MD5,
 145      SSL_kRSA | SSL_aRSA | SSL_IDEA | SSL_MD5 | SSL_SSLV2,
 146      SSL_NOT_EXP | SSL_MEDIUM,
 147      0,
 148      128,
 149      128,
 150      SSL_ALL_CIPHERS,
 151      SSL_ALL_STRENGTHS,
 152      },
 153 # endif
 154 /* DES_64_CBC_WITH_MD5 */
 155     {
 156      1,
 157      SSL2_TXT_DES_64_CBC_WITH_MD5,
 158      SSL2_CK_DES_64_CBC_WITH_MD5,
 159      SSL_kRSA | SSL_aRSA | SSL_DES | SSL_MD5 | SSL_SSLV2,
 160      SSL_NOT_EXP | SSL_LOW,
 161      0,
 162      56,
 163      56,
 164      SSL_ALL_CIPHERS,
 165      SSL_ALL_STRENGTHS,
 166      },
 167 /* DES_192_EDE3_CBC_WITH_MD5 */
 168     {
 169      1,
 170      SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
 171      SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
 172      SSL_kRSA | SSL_aRSA | SSL_3DES | SSL_MD5 | SSL_SSLV2,
 173      SSL_NOT_EXP | SSL_HIGH,
 174      0,
 175      168,
 176      168,
 177      SSL_ALL_CIPHERS,
 178      SSL_ALL_STRENGTHS,
 179      },
 180 /* RC4_64_WITH_MD5 */
 181 # if 0
 182     {
 183      1,
 184      SSL2_TXT_RC4_64_WITH_MD5,
 185      SSL2_CK_RC4_64_WITH_MD5,
 186      SSL_kRSA | SSL_aRSA | SSL_RC4 | SSL_MD5 | SSL_SSLV2,
 187      SSL_NOT_EXP | SSL_LOW,
 188      SSL2_CF_8_BYTE_ENC,
 189      64,
 190      64,
 191      SSL_ALL_CIPHERS,
 192      SSL_ALL_STRENGTHS,
 193      },
 194 # endif
 195 /* NULL SSLeay (testing) */
 196 # if 0
 197     {
 198      0,
 199      SSL2_TXT_NULL,
 200      SSL2_CK_NULL,
 201      0,
 202      SSL_STRONG_NONE,
 203      0,
 204      0,
 205      0,
 206      SSL_ALL_CIPHERS,
 207      SSL_ALL_STRENGTHS,
 208      },
 209 # endif
 210
 211 /* end of list :-) */
 212 };
 213
 214 long ssl2_default_timeout(void)
 215 {
 216     return (300);
 217 }
 218
 219 IMPLEMENT_ssl2_meth_func(sslv2_base_method,
 220                          ssl_undefined_function,
 221                          ssl_undefined_function, ssl_bad_method)
 222
 223 int ssl2_num_ciphers(void)
 224 {
 225     return (SSL2_NUM_CIPHERS);
 226 }
 227
 228 SSL_CIPHER *ssl2_get_cipher(unsigned int u)
 229 {
 230     if (u < SSL2_NUM_CIPHERS)
 231         return (&(ssl2_ciphers[SSL2_NUM_CIPHERS - 1 - u]));
 232     else
 233         return (NULL);
 234 }
 235
 236 int ssl2_pending(const SSL *s)
 237 {
 238     return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
 239 }
 240
 241 int ssl2_new(SSL *s)
 242 {
 243     SSL2_STATE *s2;
 244
 245     if ((s2 = OPENSSL_malloc(sizeof *s2)) == NULL)
 246         goto err;
 247     memset(s2, 0, sizeof *s2);
 248
 249 # if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
 250 #  error "assertion failed"
 251 # endif
 252
 253     if ((s2->rbuf =
 254          OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2)) == NULL)
 255         goto err;
 256     /*
 257      * wbuf needs one byte more because when using two-byte headers, we leave
 258      * the first byte unused in do_ssl_write (s2_pkt.c)
 259      */
 260     if ((s2->wbuf =
 261          OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 3)) == NULL)
 262         goto err;
 263     s->s2 = s2;
 264
 265     ssl2_clear(s);
 266     return (1);
 267  err:
 268     if (s2 != NULL) {
 269         if (s2->wbuf != NULL)
 270             OPENSSL_free(s2->wbuf);
 271         if (s2->rbuf != NULL)
 272             OPENSSL_free(s2->rbuf);
 273         OPENSSL_free(s2);
 274     }
 275     return (0);
 276 }
 277
 278 void ssl2_free(SSL *s)
 279 {
 280     SSL2_STATE *s2;
 281
 282     if (s == NULL)
 283         return;
 284
 285     s2 = s->s2;
 286     if (s2->rbuf != NULL)
 287         OPENSSL_free(s2->rbuf);
 288     if (s2->wbuf != NULL)
 289         OPENSSL_free(s2->wbuf);
 290     OPENSSL_cleanse(s2, sizeof *s2);
 291     OPENSSL_free(s2);
 292     s->s2 = NULL;
 293 }
 294
 295 void ssl2_clear(SSL *s)
 296 {
 297     SSL2_STATE *s2;
 298     unsigned char *rbuf, *wbuf;
 299
 300     s2 = s->s2;
 301
 302     rbuf = s2->rbuf;
 303     wbuf = s2->wbuf;
 304
 305     memset(s2, 0, sizeof *s2);
 306
 307     s2->rbuf = rbuf;
 308     s2->wbuf = wbuf;
 309     s2->clear_text = 1;
 310     s->packet = s2->rbuf;
 311     s->version = SSL2_VERSION;
 312     s->packet_length = 0;
 313 }
 314
 315 long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
 316 {
 317     int ret = 0;
 318
 319     switch (cmd) {
 320     case SSL_CTRL_GET_SESSION_REUSED:
 321         ret = s->hit;
 322         break;
 323     case SSL_CTRL_CHECK_PROTO_VERSION:
 324         return ssl3_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, larg, parg);
 325     default:
 326         break;
 327     }
 328     return (ret);
 329 }
 330
 331 long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
 332 {
 333     return (0);
 334 }
 335
 336 long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
 337 {
 338     return (0);
 339 }
 340
 341 long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
 342 {
 343     return (0);
 344 }
 345
 346 /*
 347  * This function needs to check if the ciphers required are actually
 348  * available
 349  */
 350 SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
 351 {
 352     SSL_CIPHER c, *cp;
 353     unsigned long id;
 354
 355     id = 0x02000000L | ((unsigned long)p[0] << 16L) |
 356         ((unsigned long)p[1] << 8L) | (unsigned long)p[2];
 357     c.id = id;
 358     cp = (SSL_CIPHER *)OBJ_bsearch((char *)&c,
 359                                    (char *)ssl2_ciphers,
 360                                    SSL2_NUM_CIPHERS, sizeof(SSL_CIPHER),
 361                                    FP_ICC ssl_cipher_id_cmp);
 362     if ((cp == NULL) || (cp->valid == 0))
 363         return NULL;
 364     else
 365         return cp;
 366 }
 367
 368 int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
 369 {
 370     long l;
 371
 372     if (p != NULL) {
 373         l = c->id;
 374         if ((l & 0xff000000) != 0x02000000 && l != SSL3_CK_FALLBACK_SCSV)
 375             return (0);
 376         p[0] = ((unsigned char)(l >> 16L)) & 0xFF;
 377         p[1] = ((unsigned char)(l >> 8L)) & 0xFF;
 378         p[2] = ((unsigned char)(l)) & 0xFF;
 379     }
 380     return (3);
 381 }
 382
 383 int ssl2_generate_key_material(SSL *s)
 384 {
 385     unsigned int i;
 386     EVP_MD_CTX ctx;
 387     unsigned char *km;
 388     unsigned char c = '0';
 389     const EVP_MD *md5;
 390
 391     md5 = EVP_md5();
 392
 393 # ifdef CHARSET_EBCDIC
 394     c = os_toascii['0'];        /* Must be an ASCII '0', not EBCDIC '0', see
 395                                  * SSLv2 docu */
 396 # endif
 397     EVP_MD_CTX_init(&ctx);
 398     km = s->s2->key_material;
 399
 400     if (s->session->master_key_length < 0 ||
 401         s->session->master_key_length > (int)sizeof(s->session->master_key)) {
 402         SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 403         return 0;
 404     }
 405
 406     for (i = 0; i < s->s2->key_material_length; i += EVP_MD_size(md5)) {
 407         if (((km - s->s2->key_material) + EVP_MD_size(md5)) >
 408             (int)sizeof(s->s2->key_material)) {
 409             /*
 410              * EVP_DigestFinal_ex() below would write beyond buffer
 411              */
 412             SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 413             return 0;
 414         }
 415
 416         EVP_DigestInit_ex(&ctx, md5, NULL);
 417
 418         OPENSSL_assert(s->session->master_key_length >= 0
 419                        && s->session->master_key_length
 420                        <= (int)sizeof(s->session->master_key));
 421         EVP_DigestUpdate(&ctx, s->session->master_key,
 422                          s->session->master_key_length);
 423         EVP_DigestUpdate(&ctx, &c, 1);
 424         c++;
 425         EVP_DigestUpdate(&ctx, s->s2->challenge, s->s2->challenge_length);
 426         EVP_DigestUpdate(&ctx, s->s2->conn_id, s->s2->conn_id_length);
 427         EVP_DigestFinal_ex(&ctx, km, NULL);
 428         km += EVP_MD_size(md5);
 429     }
 430
 431     EVP_MD_CTX_cleanup(&ctx);
 432     return 1;
 433 }
 434
 435 void ssl2_return_error(SSL *s, int err)
 436 {
 437     if (!s->error) {
 438         s->error = 3;
 439         s->error_code = err;
 440
 441         ssl2_write_error(s);
 442     }
 443 }
 444
 445 void ssl2_write_error(SSL *s)
 446 {
 447     unsigned char buf[3];
 448     int i, error;
 449
 450     buf[0] = SSL2_MT_ERROR;
 451     buf[1] = (s->error_code >> 8) & 0xff;
 452     buf[2] = (s->error_code) & 0xff;
 453
 454 /*      state=s->rwstate;*/
 455
 456     error = s->error;           /* number of bytes left to write */
 457     s->error = 0;
 458     OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
 459     i = ssl2_write(s, &(buf[3 - error]), error);
 460
 461 /*      if (i == error) s->rwstate=state; */
 462
 463     if (i < 0)
 464         s->error = error;
 465     else {
 466         s->error = error - i;
 467
 468         if (s->error == 0)
 469             if (s->msg_callback) {
 470                 /* ERROR */
 471                 s->msg_callback(1, s->version, 0, buf, 3, s,
 472                                 s->msg_callback_arg);
 473             }
 474     }
 475 }
 476
 477 int ssl2_shutdown(SSL *s)
 478 {
 479     s->shutdown = (SSL_SENT_SHUTDOWN | SSL_RECEIVED_SHUTDOWN);
 480     return (1);
 481 }
 482 #else                           /* !OPENSSL_NO_SSL2 */
 483
 484 # if PEDANTIC
 485 static void *dummy = &dummy;
 486 # endif
 487
 488 #endif