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/rsa.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/evp.h>
  65 #include <openssl/md5.h>
  66 #include "cryptlib.h"
  67
  68 static long ssl2_default_timeout(void );
  69 const char *ssl2_version_str="SSLv2" OPENSSL_VERSION_PTEXT;
  70
  71 #define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))
  72
  73 OPENSSL_GLOBAL SSL_CIPHER ssl2_ciphers[]={
  74 /* NULL_WITH_MD5 v3 */
  75 #if 0
  76         {
  77         1,
  78         SSL2_TXT_NULL_WITH_MD5,
  79         SSL2_CK_NULL_WITH_MD5,
  80         SSL_kRSA|SSL_aRSA|SSL_eNULL|SSL_MD5|SSL_SSLV2,
  81         SSL_EXPORT|SSL_EXP40|SSL_STRONG_NONE,
  82         0,
  83         0,
  84         0,
  85         SSL_ALL_CIPHERS,
  86         SSL_ALL_STRENGTHS,
  87         },
  88 #endif
  89 /* RC4_128_EXPORT40_WITH_MD5 */
  90         {
  91         1,
  92         SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
  93         SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
  94         SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
  95         SSL_EXPORT|SSL_EXP40,
  96         SSL2_CF_5_BYTE_ENC,
  97         40,
  98         128,
  99         SSL_ALL_CIPHERS,
 100         SSL_ALL_STRENGTHS,
 101         },
 102 /* RC4_128_WITH_MD5 */
 103         {
 104         1,
 105         SSL2_TXT_RC4_128_WITH_MD5,
 106         SSL2_CK_RC4_128_WITH_MD5,
 107         SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
 108         SSL_NOT_EXP|SSL_MEDIUM,
 109         0,
 110         128,
 111         128,
 112         SSL_ALL_CIPHERS,
 113         SSL_ALL_STRENGTHS,
 114         },
 115 /* RC2_128_CBC_EXPORT40_WITH_MD5 */
 116         {
 117         1,
 118         SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
 119         SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
 120         SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
 121         SSL_EXPORT|SSL_EXP40,
 122         SSL2_CF_5_BYTE_ENC,
 123         40,
 124         128,
 125         SSL_ALL_CIPHERS,
 126         SSL_ALL_STRENGTHS,
 127         },
 128 /* RC2_128_CBC_WITH_MD5 */
 129         {
 130         1,
 131         SSL2_TXT_RC2_128_CBC_WITH_MD5,
 132         SSL2_CK_RC2_128_CBC_WITH_MD5,
 133         SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
 134         SSL_NOT_EXP|SSL_MEDIUM,
 135         0,
 136         128,
 137         128,
 138         SSL_ALL_CIPHERS,
 139         SSL_ALL_STRENGTHS,
 140         },
 141 /* IDEA_128_CBC_WITH_MD5 */
 142         {
 143         1,
 144         SSL2_TXT_IDEA_128_CBC_WITH_MD5,
 145         SSL2_CK_IDEA_128_CBC_WITH_MD5,
 146         SSL_kRSA|SSL_aRSA|SSL_IDEA|SSL_MD5|SSL_SSLV2,
 147         SSL_NOT_EXP|SSL_MEDIUM,
 148         0,
 149         128,
 150         128,
 151         SSL_ALL_CIPHERS,
 152         SSL_ALL_STRENGTHS,
 153         },
 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         memset(s2,0,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         int i;
 375
 376         if (init)
 377                 {
 378                 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
 379
 380                 for (i=0; i<SSL2_NUM_CIPHERS; i++)
 381                         sorted[i]= &(ssl2_ciphers[i]);
 382
 383                 qsort(  (char *)sorted,
 384                         SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *),
 385                         FP_ICC ssl_cipher_ptr_id_cmp);
 386
 387                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
 388                 init=0;
 389                 }
 390
 391         id=0x02000000L|((unsigned long)p[0]<<16L)|
 392                 ((unsigned long)p[1]<<8L)|(unsigned long)p[2];
 393         c.id=id;
 394         cpp=(SSL_CIPHER **)OBJ_bsearch((char *)&cp,
 395                 (char *)sorted,
 396                 SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *),
 397                 FP_ICC ssl_cipher_ptr_id_cmp);
 398         if ((cpp == NULL) || !(*cpp)->valid)
 399                 return(NULL);
 400         else
 401                 return(*cpp);
 402         }
 403
 404 int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
 405         {
 406         long l;
 407
 408         if (p != NULL)
 409                 {
 410                 l=c->id;
 411                 if ((l & 0xff000000) != 0x02000000) return(0);
 412                 p[0]=((unsigned char)(l>>16L))&0xFF;
 413                 p[1]=((unsigned char)(l>> 8L))&0xFF;
 414                 p[2]=((unsigned char)(l     ))&0xFF;
 415                 }
 416         return(3);
 417         }
 418
 419 int ssl2_generate_key_material(SSL *s)
 420         {
 421         unsigned int i;
 422         EVP_MD_CTX ctx;
 423         unsigned char *km;
 424         unsigned char c='0';
 425         const EVP_MD *md5;
 426
 427         md5 = EVP_md5();
 428
 429 #ifdef CHARSET_EBCDIC
 430         c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0',
 431                                 see SSLv2 docu */
 432 #endif
 433         EVP_MD_CTX_init(&ctx);
 434         km=s->s2->key_material;
 435
 436         if (s->session->master_key_length < 0 || s->session->master_key_length > sizeof s->session->master_key)
 437                 {
 438                 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 439                 return 0;
 440                 }
 441
 442         for (i=0; i<s->s2->key_material_length; i += EVP_MD_block_size(md5))
 443                 {
 444                 if (((km - s->s2->key_material) + EVP_MD_block_size(md5)) > sizeof s->s2->key_material)
 445                         {
 446                         /* EVP_DigestFinal_ex() below would write beyond buffer */
 447                         SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
 448                         return 0;
 449                         }
 450
 451                 EVP_DigestInit_ex(&ctx, md5, NULL);
 452
 453                 EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length);
 454                 EVP_DigestUpdate(&ctx,&c,1);
 455                 c++;
 456                 EVP_DigestUpdate(&ctx,s->s2->challenge,s->s2->challenge_length);
 457                 EVP_DigestUpdate(&ctx,s->s2->conn_id,s->s2->conn_id_length);
 458                 EVP_DigestFinal_ex(&ctx,km,NULL);
 459                 km += EVP_MD_block_size(md5);
 460                 }
 461
 462         EVP_MD_CTX_cleanup(&ctx);
 463         return 1;
 464         }
 465
 466 void ssl2_return_error(SSL *s, int err)
 467         {
 468         if (!s->error)
 469                 {
 470                 s->error=3;
 471                 s->error_code=err;
 472
 473                 ssl2_write_error(s);
 474                 }
 475         }
 476
 477
 478 void ssl2_write_error(SSL *s)
 479         {
 480         unsigned char buf[3];
 481         int i,error;
 482
 483         buf[0]=SSL2_MT_ERROR;
 484         buf[1]=(s->error_code>>8)&0xff;
 485         buf[2]=(s->error_code)&0xff;
 486
 487 /*      state=s->rwstate;*/
 488
 489         error=s->error; /* number of bytes left to write */
 490         s->error=0;
 491         if (error < 0 || error > sizeof buf) /* can't happen */
 492                 return;
 493
 494         i=ssl2_write(s,&(buf[3-error]),error);
 495
 496 /*      if (i == error) s->rwstate=state; */
 497
 498         if (i < 0)
 499                 s->error=error;
 500         else
 501                 {
 502                 s->error=error-i;
 503
 504                 if (s->error == 0)
 505                         if (s->msg_callback)
 506                                 s->msg_callback(1, s->version, 0, buf, 3, s, s->msg_callback_arg); /* ERROR */
 507                 }
 508         }
 509
 510 int ssl2_shutdown(SSL *s)
 511         {
 512         s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
 513         return(1);
 514         }
 515 #else /* !OPENSSL_NO_SSL2 */
 516
 517 # if PEDANTIC
 518 static void *dummy=&dummy;
 519 # endif
 520
 521 #endif