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 67static long ssl2_default_timeout(void ); 68const char *ssl2_version_str="SSLv2" OPENSSL_VERSION_PTEXT; 69 70#define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER)) 71 72OPENSSL_GLOBAL SSL_CIPHER ssl2_ciphers[]={ 73/* NULL_WITH_MD5 v3 */ 74#if 0 75 { 76 1, 77 SSL2_TXT_NULL_WITH_MD5, 78 SSL2_CK_NULL_WITH_MD5, 79 SSL_kRSA|SSL_aRSA|SSL_eNULL|SSL_MD5|SSL_SSLV2, 80 SSL_EXPORT|SSL_EXP40|SSL_STRONG_NONE, 81 0, 82 0, 83 0, 84 SSL_ALL_CIPHERS, 85 SSL_ALL_STRENGTHS, 86 }, 87#endif 88/* RC4_128_EXPORT40_WITH_MD5 */ 89 { 90 1, 91 SSL2_TXT_RC4_128_EXPORT40_WITH_MD5, 92 SSL2_CK_RC4_128_EXPORT40_WITH_MD5, 93 SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2, 94 SSL_EXPORT|SSL_EXP40, 95 SSL2_CF_5_BYTE_ENC, 96 40, 97 128, 98 SSL_ALL_CIPHERS, 99 SSL_ALL_STRENGTHS, 100 }, 101/* RC4_128_WITH_MD5 */ 102 { 103 1, 104 SSL2_TXT_RC4_128_WITH_MD5, 105 SSL2_CK_RC4_128_WITH_MD5, 106 SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2, 107 SSL_NOT_EXP|SSL_MEDIUM, 108 0, 109 128, 110 128, 111 SSL_ALL_CIPHERS, 112 SSL_ALL_STRENGTHS, 113 }, 114/* RC2_128_CBC_EXPORT40_WITH_MD5 */ 115 { 116 1, 117 SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5, 118 SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5, 119 SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2, 120 SSL_EXPORT|SSL_EXP40, 121 SSL2_CF_5_BYTE_ENC, 122 40, 123 128, 124 SSL_ALL_CIPHERS, 125 SSL_ALL_STRENGTHS, 126 }, 127/* RC2_128_CBC_WITH_MD5 */ 128 { 129 1, 130 SSL2_TXT_RC2_128_CBC_WITH_MD5, 131 SSL2_CK_RC2_128_CBC_WITH_MD5, 132 SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2, 133 SSL_NOT_EXP|SSL_MEDIUM, 134 0, 135 128, 136 128, 137 SSL_ALL_CIPHERS, 138 SSL_ALL_STRENGTHS, 139 }, 140/* IDEA_128_CBC_WITH_MD5 */ 141#ifndef OPENSSL_NO_IDEA 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#endif 155/* DES_64_CBC_WITH_MD5 */ 156 { 157 1, 158 SSL2_TXT_DES_64_CBC_WITH_MD5, 159 SSL2_CK_DES_64_CBC_WITH_MD5, 160 SSL_kRSA|SSL_aRSA|SSL_DES|SSL_MD5|SSL_SSLV2, 161 SSL_NOT_EXP|SSL_LOW, 162 0, 163 56, 164 56, 165 SSL_ALL_CIPHERS, 166 SSL_ALL_STRENGTHS, 167 }, 168/* DES_192_EDE3_CBC_WITH_MD5 */ 169 { 170 1, 171 SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5, 172 SSL2_CK_DES_192_EDE3_CBC_WITH_MD5, 173 SSL_kRSA|SSL_aRSA|SSL_3DES|SSL_MD5|SSL_SSLV2, 174 SSL_NOT_EXP|SSL_HIGH, 175 0, 176 168, 177 168, 178 SSL_ALL_CIPHERS, 179 SSL_ALL_STRENGTHS, 180 }, 181/* RC4_64_WITH_MD5 */ 182#if 1 183 { 184 1, 185 SSL2_TXT_RC4_64_WITH_MD5, 186 SSL2_CK_RC4_64_WITH_MD5, 187 SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2, 188 SSL_NOT_EXP|SSL_LOW, 189 SSL2_CF_8_BYTE_ENC, 190 64, 191 64, 192 SSL_ALL_CIPHERS, 193 SSL_ALL_STRENGTHS, 194 }, 195#endif 196/* NULL SSLeay (testing) */ 197#if 0 198 { 199 0, 200 SSL2_TXT_NULL, 201 SSL2_CK_NULL, 202 0, 203 SSL_STRONG_NONE, 204 0, 205 0, 206 0, 207 SSL_ALL_CIPHERS, 208 SSL_ALL_STRENGTHS, 209 }, 210#endif 211 212/* end of list :-) */ 213 }; 214 215static SSL_METHOD SSLv2_data= { 216 SSL2_VERSION, 217 ssl2_new, /* local */ 218 ssl2_clear, /* local */ 219 ssl2_free, /* local */ 220 ssl_undefined_function, 221 ssl_undefined_function, 222 ssl2_read, 223 ssl2_peek, 224 ssl2_write, 225 ssl2_shutdown, 226 ssl_ok, /* NULL - renegotiate */ 227 ssl_ok, /* NULL - check renegotiate */ 228 ssl2_ctrl, /* local */ 229 ssl2_ctx_ctrl, /* local */ 230 ssl2_get_cipher_by_char, 231 ssl2_put_cipher_by_char, 232 ssl2_pending, 233 ssl2_num_ciphers, 234 ssl2_get_cipher, 235 ssl_bad_method, 236 ssl2_default_timeout, 237 &ssl3_undef_enc_method, 238 ssl_undefined_function, 239 ssl2_callback_ctrl, /* local */ 240 ssl2_ctx_callback_ctrl, /* local */ 241 }; 242 243static long ssl2_default_timeout(void) 244 { 245 return(300); 246 } 247 248SSL_METHOD *sslv2_base_method(void) 249 { 250 return(&SSLv2_data); 251 } 252 253int ssl2_num_ciphers(void) 254 { 255 return(SSL2_NUM_CIPHERS); 256 } 257 258SSL_CIPHER *ssl2_get_cipher(unsigned int u) 259 { 260 if (u < SSL2_NUM_CIPHERS) 261 return(&(ssl2_ciphers[SSL2_NUM_CIPHERS-1-u])); 262 else 263 return(NULL); 264 } 265 266int ssl2_pending(SSL *s) 267 { 268 return SSL_in_init(s) ? 0 : s->s2->ract_data_length; 269 } 270 271int ssl2_new(SSL *s) 272 { 273 SSL2_STATE *s2; 274 275 if ((s2=OPENSSL_malloc(sizeof *s2)) == NULL) goto err; 276 memset(s2,0,sizeof *s2); 277 278#if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2 279# error "assertion failed" 280#endif 281 282 if ((s2->rbuf=OPENSSL_malloc( 283 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err; 284 /* wbuf needs one byte more because when using two-byte headers, 285 * we leave the first byte unused in do_ssl_write (s2_pkt.c) */ 286 if ((s2->wbuf=OPENSSL_malloc( 287 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+3)) == NULL) goto err; 288 s->s2=s2; 289 290 ssl2_clear(s); 291 return(1); 292err: 293 if (s2 != NULL) 294 { 295 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf); 296 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf); 297 OPENSSL_free(s2); 298 } 299 return(0); 300 } 301 302void ssl2_free(SSL *s) 303 { 304 SSL2_STATE *s2; 305 306 if(s == NULL) 307 return; 308 309 s2=s->s2; 310 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf); 311 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf); 312 OPENSSL_cleanse(s2,sizeof *s2); 313 OPENSSL_free(s2); 314 s->s2=NULL; 315 } 316 317void ssl2_clear(SSL *s) 318 { 319 SSL2_STATE *s2; 320 unsigned char *rbuf,*wbuf; 321 322 s2=s->s2; 323 324 rbuf=s2->rbuf; 325 wbuf=s2->wbuf; 326 327 memset(s2,0,sizeof *s2); 328 329 s2->rbuf=rbuf; 330 s2->wbuf=wbuf; 331 s2->clear_text=1; 332 s->packet=s2->rbuf; 333 s->version=SSL2_VERSION; 334 s->packet_length=0; 335 } 336 337long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg) 338 { 339 int ret=0; 340 341 switch(cmd) 342 { 343 case SSL_CTRL_GET_SESSION_REUSED: 344 ret=s->hit; 345 break; 346 default: 347 break; 348 } 349 return(ret); 350 } 351 352long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp)()) 353 { 354 return(0); 355 } 356 357long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg) 358 { 359 return(0); 360 } 361 362long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)()) 363 { 364 return(0); 365 } 366 367/* This function needs to check if the ciphers required are actually 368 * available */ 369SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p) 370 { 371 static int init=1; 372 static SSL_CIPHER *sorted[SSL2_NUM_CIPHERS]; 373 SSL_CIPHER c,*cp= &c,**cpp; 374 unsigned long id; 375 int i; 376 377 if (init) 378 { 379 CRYPTO_w_lock(CRYPTO_LOCK_SSL); 380 381 if (init) 382 { 383 for (i=0; i<SSL2_NUM_CIPHERS; i++) 384 sorted[i]= &(ssl2_ciphers[i]); 385 386 qsort((char *)sorted, 387 SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *), 388 FP_ICC ssl_cipher_ptr_id_cmp); 389 390 init=0; 391 } 392 393 CRYPTO_w_unlock(CRYPTO_LOCK_SSL); 394 } 395 396 id=0x02000000L|((unsigned long)p[0]<<16L)| 397 ((unsigned long)p[1]<<8L)|(unsigned long)p[2]; 398 c.id=id; 399 cpp=(SSL_CIPHER **)OBJ_bsearch((char *)&cp, 400 (char *)sorted, 401 SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *), 402 FP_ICC ssl_cipher_ptr_id_cmp); 403 if ((cpp == NULL) || !(*cpp)->valid) 404 return(NULL); 405 else 406 return(*cpp); 407 } 408 409int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p) 410 { 411 long l; 412 413 if (p != NULL) 414 { 415 l=c->id; 416 if ((l & 0xff000000) != 0x02000000) return(0); 417 p[0]=((unsigned char)(l>>16L))&0xFF; 418 p[1]=((unsigned char)(l>> 8L))&0xFF; 419 p[2]=((unsigned char)(l ))&0xFF; 420 } 421 return(3); 422 } 423 424int ssl2_generate_key_material(SSL *s) 425 { 426 unsigned int i; 427 EVP_MD_CTX ctx; 428 unsigned char *km; 429 unsigned char c='0'; 430 const EVP_MD *md5; 431 432 md5 = EVP_md5(); 433 434#ifdef CHARSET_EBCDIC 435 c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0', 436 see SSLv2 docu */ 437#endif 438 EVP_MD_CTX_init(&ctx); 439 km=s->s2->key_material; 440 441 if (s->session->master_key_length < 0 || s->session->master_key_length > 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)) > sizeof s->s2->key_material) 450 { 451 /* EVP_DigestFinal_ex() below would write beyond buffer */ 452 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR); 453 return 0; 454 } 455 456 EVP_DigestInit_ex(&ctx, md5, NULL); 457 458 OPENSSL_assert(s->session->master_key_length >= 0 459 && s->session->master_key_length 460 < sizeof s->session->master_key); 461 EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length); 462 EVP_DigestUpdate(&ctx,&c,1); 463 c++; 464 EVP_DigestUpdate(&ctx,s->s2->challenge,s->s2->challenge_length); 465 EVP_DigestUpdate(&ctx,s->s2->conn_id,s->s2->conn_id_length); 466 EVP_DigestFinal_ex(&ctx,km,NULL); 467 km += EVP_MD_size(md5); 468 } 469 470 EVP_MD_CTX_cleanup(&ctx); 471 return 1; 472 } 473 474void ssl2_return_error(SSL *s, int err) 475 { 476 if (!s->error) 477 { 478 s->error=3; 479 s->error_code=err; 480 481 ssl2_write_error(s); 482 } 483 } 484 485 486void ssl2_write_error(SSL *s) 487 { 488 unsigned char buf[3]; 489 int i,error; 490 491 buf[0]=SSL2_MT_ERROR; 492 buf[1]=(s->error_code>>8)&0xff; 493 buf[2]=(s->error_code)&0xff; 494 495/* state=s->rwstate;*/ 496 497 error=s->error; /* number of bytes left to write */ 498 s->error=0; 499 OPENSSL_assert(error >= 0 && error <= sizeof buf); 500 i=ssl2_write(s,&(buf[3-error]),error); 501 502/* if (i == error) s->rwstate=state; */ 503 504 if (i < 0) 505 s->error=error; 506 else 507 { 508 s->error=error-i; 509 510 if (s->error == 0) 511 if (s->msg_callback) 512 s->msg_callback(1, s->version, 0, buf, 3, s, s->msg_callback_arg); /* ERROR */ 513 } 514 } 515 516int ssl2_shutdown(SSL *s) 517 { 518 s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN); 519 return(1); 520 } 521#else /* !OPENSSL_NO_SSL2 */ 522 523# if PEDANTIC 524static void *dummy=&dummy; 525# endif 526 527#endif 528