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 66const 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) */ 71OPENSSL_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/* DES_64_CBC_WITH_MD5 */ 141 { 142 1, 143 SSL2_TXT_DES_64_CBC_WITH_MD5, 144 SSL2_CK_DES_64_CBC_WITH_MD5, 145 SSL_kRSA|SSL_aRSA|SSL_DES|SSL_MD5|SSL_SSLV2, 146 SSL_NOT_EXP|SSL_LOW, 147 0, 148 56, 149 56, 150 SSL_ALL_CIPHERS, 151 SSL_ALL_STRENGTHS, 152 }, 153/* DES_192_EDE3_CBC_WITH_MD5 */ 154 { 155 1, 156 SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5, 157 SSL2_CK_DES_192_EDE3_CBC_WITH_MD5, 158 SSL_kRSA|SSL_aRSA|SSL_3DES|SSL_MD5|SSL_SSLV2, 159 SSL_NOT_EXP|SSL_HIGH, 160 0, 161 168, 162 168, 163 SSL_ALL_CIPHERS, 164 SSL_ALL_STRENGTHS, 165 }, 166/* RC4_64_WITH_MD5 */ 167#if 0 168 { 169 1, 170 SSL2_TXT_RC4_64_WITH_MD5, 171 SSL2_CK_RC4_64_WITH_MD5, 172 SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2, 173 SSL_NOT_EXP|SSL_LOW, 174 SSL2_CF_8_BYTE_ENC, 175 64, 176 64, 177 SSL_ALL_CIPHERS, 178 SSL_ALL_STRENGTHS, 179 }, 180#endif 181/* NULL SSLeay (testing) */ 182#if 0 183 { 184 0, 185 SSL2_TXT_NULL, 186 SSL2_CK_NULL, 187 0, 188 SSL_STRONG_NONE, 189 0, 190 0, 191 0, 192 SSL_ALL_CIPHERS, 193 SSL_ALL_STRENGTHS, 194 }, 195#endif 196 197/* end of list :-) */ 198 }; 199 200long ssl2_default_timeout(void) 201 { 202 return(300); 203 } 204 205IMPLEMENT_ssl2_meth_func(sslv2_base_method, 206 ssl_undefined_function, 207 ssl_undefined_function, 208 ssl_bad_method) 209 210int ssl2_num_ciphers(void) 211 { 212 return(SSL2_NUM_CIPHERS); 213 } 214 215SSL_CIPHER *ssl2_get_cipher(unsigned int u) 216 { 217 if (u < SSL2_NUM_CIPHERS) 218 return(&(ssl2_ciphers[SSL2_NUM_CIPHERS-1-u])); 219 else 220 return(NULL); 221 } 222 223int ssl2_pending(const SSL *s) 224 { 225 return SSL_in_init(s) ? 0 : s->s2->ract_data_length; 226 } 227 228int ssl2_new(SSL *s) 229 { 230 SSL2_STATE *s2; 231 232 if ((s2=OPENSSL_malloc(sizeof *s2)) == NULL) goto err; 233 memset(s2,0,sizeof *s2); 234 235#if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2 236# error "assertion failed" 237#endif 238 239 if ((s2->rbuf=OPENSSL_malloc( 240 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err; 241 /* wbuf needs one byte more because when using two-byte headers, 242 * we leave the first byte unused in do_ssl_write (s2_pkt.c) */ 243 if ((s2->wbuf=OPENSSL_malloc( 244 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+3)) == NULL) goto err; 245 s->s2=s2; 246 247 ssl2_clear(s); 248 return(1); 249err: 250 if (s2 != NULL) 251 { 252 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf); 253 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf); 254 OPENSSL_free(s2); 255 } 256 return(0); 257 } 258 259void ssl2_free(SSL *s) 260 { 261 SSL2_STATE *s2; 262 263 if(s == NULL) 264 return; 265 266 s2=s->s2; 267 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf); 268 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf); 269 OPENSSL_cleanse(s2,sizeof *s2); 270 OPENSSL_free(s2); 271 s->s2=NULL; 272 } 273 274void ssl2_clear(SSL *s) 275 { 276 SSL2_STATE *s2; 277 unsigned char *rbuf,*wbuf; 278 279 s2=s->s2; 280 281 rbuf=s2->rbuf; 282 wbuf=s2->wbuf; 283 284 memset(s2,0,sizeof *s2); 285 286 s2->rbuf=rbuf; 287 s2->wbuf=wbuf; 288 s2->clear_text=1; 289 s->packet=s2->rbuf; 290 s->version=SSL2_VERSION; 291 s->packet_length=0; 292 } 293 294long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg) 295 { 296 int ret=0; 297 298 switch(cmd) 299 { 300 case SSL_CTRL_GET_SESSION_REUSED: 301 ret=s->hit; 302 break; 303 default: 304 break; 305 } 306 return(ret); 307 } 308 309long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp)(void)) 310 { 311 return(0); 312 } 313 314long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg) 315 { 316 return(0); 317 } 318 319long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)(void)) 320 { 321 return(0); 322 } 323 324/* This function needs to check if the ciphers required are actually 325 * available */ 326SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p) 327 { 328 SSL_CIPHER c,*cp; 329 unsigned long id; 330 331 id=0x02000000L|((unsigned long)p[0]<<16L)| 332 ((unsigned long)p[1]<<8L)|(unsigned long)p[2]; 333 c.id=id; 334 cp = (SSL_CIPHER *)OBJ_bsearch((char *)&c, 335 (char *)ssl2_ciphers, 336 SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER), 337 FP_ICC ssl_cipher_id_cmp); 338 if ((cp == NULL) || (cp->valid == 0)) 339 return NULL; 340 else 341 return cp; 342 } 343 344int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p) 345 { 346 long l; 347 348 if (p != NULL) 349 { 350 l=c->id; 351 if ((l & 0xff000000) != 0x02000000) return(0); 352 p[0]=((unsigned char)(l>>16L))&0xFF; 353 p[1]=((unsigned char)(l>> 8L))&0xFF; 354 p[2]=((unsigned char)(l ))&0xFF; 355 } 356 return(3); 357 } 358 359int ssl2_generate_key_material(SSL *s) 360 { 361 unsigned int i; 362 EVP_MD_CTX ctx; 363 unsigned char *km; 364 unsigned char c='0'; 365 const EVP_MD *md5; 366 367 md5 = EVP_md5(); 368 369#ifdef CHARSET_EBCDIC 370 c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0', 371 see SSLv2 docu */ 372#endif 373 EVP_MD_CTX_init(&ctx); 374 km=s->s2->key_material; 375 376 if (s->session->master_key_length < 0 || 377 s->session->master_key_length > (int)sizeof(s->session->master_key)) 378 { 379 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR); 380 return 0; 381 } 382 383 for (i=0; i<s->s2->key_material_length; i += EVP_MD_size(md5)) 384 { 385 if (((km - s->s2->key_material) + EVP_MD_size(md5)) > 386 (int)sizeof(s->s2->key_material)) 387 { 388 /* EVP_DigestFinal_ex() below would write beyond buffer */ 389 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR); 390 return 0; 391 } 392 393 EVP_DigestInit_ex(&ctx, md5, NULL); 394 395 OPENSSL_assert(s->session->master_key_length >= 0 396 && s->session->master_key_length 397 < (int)sizeof(s->session->master_key)); 398 EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length); 399 EVP_DigestUpdate(&ctx,&c,1); 400 c++; 401 EVP_DigestUpdate(&ctx,s->s2->challenge,s->s2->challenge_length); 402 EVP_DigestUpdate(&ctx,s->s2->conn_id,s->s2->conn_id_length); 403 EVP_DigestFinal_ex(&ctx,km,NULL); 404 km += EVP_MD_size(md5); 405 } 406 407 EVP_MD_CTX_cleanup(&ctx); 408 return 1; 409 } 410 411void ssl2_return_error(SSL *s, int err) 412 { 413 if (!s->error) 414 { 415 s->error=3; 416 s->error_code=err; 417 418 ssl2_write_error(s); 419 } 420 } 421 422 423void ssl2_write_error(SSL *s) 424 { 425 unsigned char buf[3]; 426 int i,error; 427 428 buf[0]=SSL2_MT_ERROR; 429 buf[1]=(s->error_code>>8)&0xff; 430 buf[2]=(s->error_code)&0xff; 431 432/* state=s->rwstate;*/ 433 434 error=s->error; /* number of bytes left to write */ 435 s->error=0; 436 OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf)); 437 i=ssl2_write(s,&(buf[3-error]),error); 438 439/* if (i == error) s->rwstate=state; */ 440 441 if (i < 0) 442 s->error=error; 443 else 444 { 445 s->error=error-i; 446 447 if (s->error == 0) 448 if (s->msg_callback) 449 s->msg_callback(1, s->version, 0, buf, 3, s, s->msg_callback_arg); /* ERROR */ 450 } 451 } 452 453int ssl2_shutdown(SSL *s) 454 { 455 s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN); 456 return(1); 457 } 458#else /* !OPENSSL_NO_SSL2 */ 459 460# if PEDANTIC 461static void *dummy=&dummy; 462# endif 463 464#endif 465