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,
 222                         ssl_bad_method)
 223
 224 int ssl2_num_ciphers(void)
 225         {
 226         return(SSL2_NUM_CIPHERS);
 227         }
 228
 229 SSL_CIPHER *ssl2_get_cipher(unsigned int u)
 230         {
 231         if (u < SSL2_NUM_CIPHERS)
 232                 return(&(ssl2_ciphers[SSL2_NUM_CIPHERS-1-u]));
 233         else
 234                 return(NULL);
 235         }
 236
 237 int ssl2_pending(const SSL *s)
 238         {
 239         return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
 240         }
 241
 242 int ssl2_new(SSL *s)
 243         {
 244         SSL2_STATE *s2;
 245
 246         if ((s2=OPENSSL_malloc(sizeof *s2)) == NULL) 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=OPENSSL_malloc(
 254                 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err;
 255         /* wbuf needs one byte more because when using two-byte headers,
 256          * we leave the first byte unused in do_ssl_write (s2_pkt.c) */
 257         if ((s2->wbuf=OPENSSL_malloc(
 258                 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+3)) == NULL) goto err;
 259         s->s2=s2;
 260
 261         ssl2_clear(s);
 262         return(1);
 263 err:
 264         if (s2 != NULL)
 265                 {
 266                 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
 267                 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
 268                 OPENSSL_free(s2);
 269                 }
 270         return(0);
 271         }
 272
 273 void ssl2_free(SSL *s)
 274         {
 275         SSL2_STATE *s2;
 276
 277         if(s == NULL)
 278             return;
 279
 280         s2=s->s2;
 281         if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
 282         if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
 283         OPENSSL_cleanse(s2,sizeof *s2);
 284         OPENSSL_free(s2);
 285         s->s2=NULL;
 286         }
 287
 288 void ssl2_clear(SSL *s)
 289         {
 290         SSL2_STATE *s2;
 291         unsigned char *rbuf,*wbuf;
 292
 293         s2=s->s2;
 294
 295         rbuf=s2->rbuf;
 296         wbuf=s2->wbuf;
 297
 298         memset(s2,0,sizeof *s2);
 299
 300         s2->rbuf=rbuf;
 301         s2->wbuf=wbuf;
 302         s2->clear_text=1;
 303         s->packet=s2->rbuf;
 304         s->version=SSL2_VERSION;
 305         s->packet_length=0;
 306         }
 307
 308 long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
 309         {
 310         int ret=0;
 311
 312         switch(cmd)
 313                 {
 314         case SSL_CTRL_GET_SESSION_REUSED:
 315                 ret=s->hit;
 316                 break;
 317         default:
 318                 break;
 319                 }
 320         return(ret);
 321         }
 322
 323 long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp)(void))
 324         {
 325         return(0);
 326         }
 327
 328 long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
 329         {
 330         return(0);
 331         }
 332
 333 long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)(void))
 334         {
 335         return(0);
 336         }
 337
 338 /* This function needs to check if the ciphers required are actually
 339  * available */
 340 SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
 341         {
 342         SSL_CIPHER c,*cp;
 343         unsigned long id;
 344
 345         id=0x02000000L|((unsigned long)p[0]<<16L)|
 346                 ((unsigned long)p[1]<<8L)|(unsigned long)p[2];
 347         c.id=id;
 348         cp = (SSL_CIPHER *)OBJ_bsearch((char *)&c,
 349                 (char *)ssl2_ciphers,
 350                 SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER),
 351                 FP_ICC ssl_cipher_id_cmp);
 352         if ((cp == NULL) || (cp->valid == 0))
 353                 return NULL;
 354         else
 355                 return cp;
 356         }
 357
 358 int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
 359         {
 360         long l;
 361
 362         if (p != NULL)
 363                 {
 364                 l=c->id;
 365                 if ((l & 0xff000000) != 0x02000000) return(0);
 366                 p[0]=((unsigned char)(l>>16L))&0xFF;
 367                 p[1]=((unsigned char)(l>> 8L))&0xFF;
 368                 p[2]=((unsigned char)(l     ))&0xFF;
 369                 }
 370         return(3);
 371         }
 372
 373 int ssl2_generate_key_material(SSL *s)
 374         {
 375         unsigned int i;
 376         EVP_MD_CTX ctx;
 377         unsigned char *km;
 378         unsigned char c='0';
 379         const EVP_MD *md5;
 380
 381         md5 = EVP_md5();
 382
 383 #ifdef CHARSET_EBCDIC
 384         c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0',
 385                                 see SSLv2 docu */
 386 #endif
 387         EVP_MD_CTX_init(&ctx);
 388         km=s->s2->key_material;
 389
 390         if (s->session->master_key_length < 0 ||
 391                         s->session->master_key_length > (int)sizeof(s->session->master_key))
 392                 {
 393                 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 394                 return 0;
 395                 }
 396
 397         for (i=0; i<s->s2->key_material_length; i += EVP_MD_size(md5))
 398                 {
 399                 if (((km - s->s2->key_material) + EVP_MD_size(md5)) >
 400                                 (int)sizeof(s->s2->key_material))
 401                         {
 402                         /* EVP_DigestFinal_ex() below would write beyond buffer */
 403                         SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 404                         return 0;
 405                         }
 406
 407                 EVP_DigestInit_ex(&ctx, md5, NULL);
 408
 409                 OPENSSL_assert(s->session->master_key_length >= 0
 410                     && s->session->master_key_length
 411                     < (int)sizeof(s->session->master_key));
 412                 EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length);
 413                 EVP_DigestUpdate(&ctx,&c,1);
 414                 c++;
 415                 EVP_DigestUpdate(&ctx,s->s2->challenge,s->s2->challenge_length);
 416                 EVP_DigestUpdate(&ctx,s->s2->conn_id,s->s2->conn_id_length);
 417                 EVP_DigestFinal_ex(&ctx,km,NULL);
 418                 km += EVP_MD_size(md5);
 419                 }
 420
 421         EVP_MD_CTX_cleanup(&ctx);
 422         return 1;
 423         }
 424
 425 void ssl2_return_error(SSL *s, int err)
 426         {
 427         if (!s->error)
 428                 {
 429                 s->error=3;
 430                 s->error_code=err;
 431
 432                 ssl2_write_error(s);
 433                 }
 434         }
 435
 436
 437 void ssl2_write_error(SSL *s)
 438         {
 439         unsigned char buf[3];
 440         int i,error;
 441
 442         buf[0]=SSL2_MT_ERROR;
 443         buf[1]=(s->error_code>>8)&0xff;
 444         buf[2]=(s->error_code)&0xff;
 445
 446 /*      state=s->rwstate;*/
 447
 448         error=s->error; /* number of bytes left to write */
 449         s->error=0;
 450         OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
 451         i=ssl2_write(s,&(buf[3-error]),error);
 452
 453 /*      if (i == error) s->rwstate=state; */
 454
 455         if (i < 0)
 456                 s->error=error;
 457         else
 458                 {
 459                 s->error=error-i;
 460
 461                 if (s->error == 0)
 462                         if (s->msg_callback)
 463                                 s->msg_callback(1, s->version, 0, buf, 3, s, s->msg_callback_arg); /* ERROR */
 464                 }
 465         }
 466
 467 int ssl2_shutdown(SSL *s)
 468         {
 469         s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
 470         return(1);
 471         }
 472 #else /* !OPENSSL_NO_SSL2 */
 473
 474 # if PEDANTIC
 475 static void *dummy=&dummy;
 476 # endif
 477
 478 #endif