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 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|SSL_STRONG_NONE,
  80         0,
  81         0,
  82         0,
  83         SSL_ALL_CIPHERS,
  84         SSL_ALL_STRENGTHS,
  85         },
  86 #endif
  87 /* RC4_128_EXPORT40_WITH_MD5 */
  88         {
  89         1,
  90         SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
  91         SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
  92         SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
  93         SSL_EXPORT|SSL_EXP40,
  94         SSL2_CF_5_BYTE_ENC,
  95         40,
  96         128,
  97         SSL_ALL_CIPHERS,
  98         SSL_ALL_STRENGTHS,
  99         },
 100 /* RC4_128_WITH_MD5 */
 101         {
 102         1,
 103         SSL2_TXT_RC4_128_WITH_MD5,
 104         SSL2_CK_RC4_128_WITH_MD5,
 105         SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
 106         SSL_NOT_EXP|SSL_MEDIUM,
 107         0,
 108         128,
 109         128,
 110         SSL_ALL_CIPHERS,
 111         SSL_ALL_STRENGTHS,
 112         },
 113 /* RC2_128_CBC_EXPORT40_WITH_MD5 */
 114         {
 115         1,
 116         SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
 117         SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
 118         SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
 119         SSL_EXPORT|SSL_EXP40,
 120         SSL2_CF_5_BYTE_ENC,
 121         40,
 122         128,
 123         SSL_ALL_CIPHERS,
 124         SSL_ALL_STRENGTHS,
 125         },
 126 /* RC2_128_CBC_WITH_MD5 */
 127         {
 128         1,
 129         SSL2_TXT_RC2_128_CBC_WITH_MD5,
 130         SSL2_CK_RC2_128_CBC_WITH_MD5,
 131         SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
 132         SSL_NOT_EXP|SSL_MEDIUM,
 133         0,
 134         128,
 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 1
 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 static SSL_METHOD SSLv2_data= {
 215         SSL2_VERSION,
 216         ssl2_new,       /* local */
 217         ssl2_clear,     /* local */
 218         ssl2_free,      /* local */
 219         ssl_undefined_function,
 220         ssl_undefined_function,
 221         ssl2_read,
 222         ssl2_peek,
 223         ssl2_write,
 224         ssl2_shutdown,
 225         ssl_ok, /* NULL - renegotiate */
 226         ssl_ok, /* NULL - check renegotiate */
 227         ssl2_ctrl,      /* local */
 228         ssl2_ctx_ctrl,  /* local */
 229         ssl2_get_cipher_by_char,
 230         ssl2_put_cipher_by_char,
 231         ssl2_pending,
 232         ssl2_num_ciphers,
 233         ssl2_get_cipher,
 234         ssl_bad_method,
 235         ssl2_default_timeout,
 236         &ssl3_undef_enc_method,
 237         ssl_undefined_function,
 238         ssl2_callback_ctrl,     /* local */
 239         ssl2_ctx_callback_ctrl, /* local */
 240         };
 241
 242 static long ssl2_default_timeout(void)
 243         {
 244         return(300);
 245         }
 246
 247 SSL_METHOD *sslv2_base_method(void)
 248         {
 249         return(&SSLv2_data);
 250         }
 251
 252 int ssl2_num_ciphers(void)
 253         {
 254         return(SSL2_NUM_CIPHERS);
 255         }
 256
 257 SSL_CIPHER *ssl2_get_cipher(unsigned int u)
 258         {
 259         if (u < SSL2_NUM_CIPHERS)
 260                 return(&(ssl2_ciphers[SSL2_NUM_CIPHERS-1-u]));
 261         else
 262                 return(NULL);
 263         }
 264
 265 int ssl2_pending(SSL *s)
 266         {
 267         return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
 268         }
 269
 270 int ssl2_new(SSL *s)
 271         {
 272         SSL2_STATE *s2;
 273
 274         if ((s2=OPENSSL_malloc(sizeof *s2)) == NULL) goto err;
 275         memset(s2,0,sizeof *s2);
 276
 277 #if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
 278 #  error "assertion failed"
 279 #endif
 280
 281         if ((s2->rbuf=OPENSSL_malloc(
 282                 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err;
 283         /* wbuf needs one byte more because when using two-byte headers,
 284          * we leave the first byte unused in do_ssl_write (s2_pkt.c) */
 285         if ((s2->wbuf=OPENSSL_malloc(
 286                 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+3)) == NULL) goto err;
 287         s->s2=s2;
 288
 289         ssl2_clear(s);
 290         return(1);
 291 err:
 292         if (s2 != NULL)
 293                 {
 294                 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
 295                 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
 296                 OPENSSL_free(s2);
 297                 }
 298         return(0);
 299         }
 300
 301 void ssl2_free(SSL *s)
 302         {
 303         SSL2_STATE *s2;
 304
 305         if(s == NULL)
 306             return;
 307
 308         s2=s->s2;
 309         if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
 310         if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
 311         OPENSSL_cleanse(s2,sizeof *s2);
 312         OPENSSL_free(s2);
 313         s->s2=NULL;
 314         }
 315
 316 void ssl2_clear(SSL *s)
 317         {
 318         SSL2_STATE *s2;
 319         unsigned char *rbuf,*wbuf;
 320
 321         s2=s->s2;
 322
 323         rbuf=s2->rbuf;
 324         wbuf=s2->wbuf;
 325
 326         memset(s2,0,sizeof *s2);
 327
 328         s2->rbuf=rbuf;
 329         s2->wbuf=wbuf;
 330         s2->clear_text=1;
 331         s->packet=s2->rbuf;
 332         s->version=SSL2_VERSION;
 333         s->packet_length=0;
 334         }
 335
 336 long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
 337         {
 338         int ret=0;
 339
 340         switch(cmd)
 341                 {
 342         case SSL_CTRL_GET_SESSION_REUSED:
 343                 ret=s->hit;
 344                 break;
 345         default:
 346                 break;
 347                 }
 348         return(ret);
 349         }
 350
 351 long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp)())
 352         {
 353         return(0);
 354         }
 355
 356 long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
 357         {
 358         return(0);
 359         }
 360
 361 long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)())
 362         {
 363         return(0);
 364         }
 365
 366 /* This function needs to check if the ciphers required are actually
 367  * available */
 368 SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
 369         {
 370         static int init=1;
 371         static SSL_CIPHER *sorted[SSL2_NUM_CIPHERS];
 372         SSL_CIPHER c,*cp= &c,**cpp;
 373         unsigned long id;
 374         unsigned int i;
 375
 376         if (init)
 377                 {
 378                 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
 379
 380                 if (init)
 381                         {
 382                         for (i=0; i<SSL2_NUM_CIPHERS; i++)
 383                                 sorted[i]= &(ssl2_ciphers[i]);
 384
 385                         qsort((char *)sorted,
 386                                 SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *),
 387                                 FP_ICC ssl_cipher_ptr_id_cmp);
 388
 389                         init=0;
 390                         }
 391
 392                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
 393                 }
 394
 395         id=0x02000000L|((unsigned long)p[0]<<16L)|
 396                 ((unsigned long)p[1]<<8L)|(unsigned long)p[2];
 397         c.id=id;
 398         cpp=(SSL_CIPHER **)OBJ_bsearch((char *)&cp,
 399                 (char *)sorted,
 400                 SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *),
 401                 FP_ICC ssl_cipher_ptr_id_cmp);
 402         if ((cpp == NULL) || !(*cpp)->valid)
 403                 return(NULL);
 404         else
 405                 return(*cpp);
 406         }
 407
 408 int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
 409         {
 410         long l;
 411
 412         if (p != NULL)
 413                 {
 414                 l=c->id;
 415                 if ((l & 0xff000000) != 0x02000000) return(0);
 416                 p[0]=((unsigned char)(l>>16L))&0xFF;
 417                 p[1]=((unsigned char)(l>> 8L))&0xFF;
 418                 p[2]=((unsigned char)(l     ))&0xFF;
 419                 }
 420         return(3);
 421         }
 422
 423 int ssl2_generate_key_material(SSL *s)
 424         {
 425         unsigned int i;
 426         EVP_MD_CTX ctx;
 427         unsigned char *km;
 428         unsigned char c='0';
 429         const EVP_MD *md5;
 430
 431         md5 = EVP_md5();
 432
 433 #ifdef CHARSET_EBCDIC
 434         c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0',
 435                                 see SSLv2 docu */
 436 #endif
 437         EVP_MD_CTX_init(&ctx);
 438         km=s->s2->key_material;
 439
 440         if (s->session->master_key_length < 0 ||
 441                         s->session->master_key_length > (int)sizeof(s->session->master_key))
 442                 {
 443                 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 444                 return 0;
 445                 }
 446
 447         for (i=0; i<s->s2->key_material_length; i += EVP_MD_size(md5))
 448                 {
 449                 if (((km - s->s2->key_material) + EVP_MD_size(md5)) >
 450                                 (int)sizeof(s->s2->key_material))
 451                         {
 452                         /* EVP_DigestFinal_ex() below would write beyond buffer */
 453                         SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 454                         return 0;
 455                         }
 456
 457                 EVP_DigestInit_ex(&ctx, md5, NULL);
 458
 459                 OPENSSL_assert(s->session->master_key_length >= 0
 460                     && s->session->master_key_length
 461                     < (int)sizeof(s->session->master_key));
 462                 EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length);
 463                 EVP_DigestUpdate(&ctx,&c,1);
 464                 c++;
 465                 EVP_DigestUpdate(&ctx,s->s2->challenge,s->s2->challenge_length);
 466                 EVP_DigestUpdate(&ctx,s->s2->conn_id,s->s2->conn_id_length);
 467                 EVP_DigestFinal_ex(&ctx,km,NULL);
 468                 km += EVP_MD_size(md5);
 469                 }
 470
 471         EVP_MD_CTX_cleanup(&ctx);
 472         return 1;
 473         }
 474
 475 void ssl2_return_error(SSL *s, int err)
 476         {
 477         if (!s->error)
 478                 {
 479                 s->error=3;
 480                 s->error_code=err;
 481
 482                 ssl2_write_error(s);
 483                 }
 484         }
 485
 486
 487 void ssl2_write_error(SSL *s)
 488         {
 489         unsigned char buf[3];
 490         int i,error;
 491
 492         buf[0]=SSL2_MT_ERROR;
 493         buf[1]=(s->error_code>>8)&0xff;
 494         buf[2]=(s->error_code)&0xff;
 495
 496 /*      state=s->rwstate;*/
 497
 498         error=s->error; /* number of bytes left to write */
 499         s->error=0;
 500         OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
 501         i=ssl2_write(s,&(buf[3-error]),error);
 502
 503 /*      if (i == error) s->rwstate=state; */
 504
 505         if (i < 0)
 506                 s->error=error;
 507         else
 508                 {
 509                 s->error=error-i;
 510
 511                 if (s->error == 0)
 512                         if (s->msg_callback)
 513                                 s->msg_callback(1, s->version, 0, buf, 3, s, s->msg_callback_arg); /* ERROR */
 514                 }
 515         }
 516
 517 int ssl2_shutdown(SSL *s)
 518         {
 519         s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
 520         return(1);
 521         }
 522 #else /* !OPENSSL_NO_SSL2 */
 523
 524 # if PEDANTIC
 525 static void *dummy=&dummy;
 526 # endif
 527
 528 #endif