1/* ssl/s23_clnt.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 <stdio.h> 60#include "ssl_locl.h" 61#include <openssl/buffer.h> 62#include <openssl/rand.h> 63#include <openssl/objects.h> 64#include <openssl/evp.h> 65 66static SSL_METHOD *ssl23_get_client_method(int ver); 67static int ssl23_client_hello(SSL *s); 68static int ssl23_get_server_hello(SSL *s); 69static SSL_METHOD *ssl23_get_client_method(int ver) 70 { 71#ifndef OPENSSL_NO_SSL2 72 if (ver == SSL2_VERSION) 73 return(SSLv2_client_method()); 74#endif 75 if (ver == SSL3_VERSION) 76 return(SSLv3_client_method()); 77 else if (ver == TLS1_VERSION) 78 return(TLSv1_client_method()); 79 else 80 return(NULL); 81 } 82 83IMPLEMENT_ssl23_meth_func(SSLv23_client_method, 84 ssl_undefined_function, 85 ssl23_connect, 86 ssl23_get_client_method) 87 88int ssl23_connect(SSL *s) 89 { 90 BUF_MEM *buf=NULL; 91 unsigned long Time=(unsigned long)time(NULL); 92 void (*cb)(const SSL *ssl,int type,int val)=NULL; 93 int ret= -1; 94 int new_state,state; 95 96 RAND_add(&Time,sizeof(Time),0); 97 ERR_clear_error(); 98 clear_sys_error(); 99 100 if (s->info_callback != NULL) 101 cb=s->info_callback; 102 else if (s->ctx->info_callback != NULL) 103 cb=s->ctx->info_callback; 104 105 s->in_handshake++; 106 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 107 108 for (;;) 109 { 110 state=s->state; 111 112 switch(s->state) 113 { 114 case SSL_ST_BEFORE: 115 case SSL_ST_CONNECT: 116 case SSL_ST_BEFORE|SSL_ST_CONNECT: 117 case SSL_ST_OK|SSL_ST_CONNECT: 118 119 if (s->session != NULL) 120 { 121 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE); 122 ret= -1; 123 goto end; 124 } 125 s->server=0; 126 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 127 128 /* s->version=TLS1_VERSION; */ 129 s->type=SSL_ST_CONNECT; 130 131 if (s->init_buf == NULL) 132 { 133 if ((buf=BUF_MEM_new()) == NULL) 134 { 135 ret= -1; 136 goto end; 137 } 138 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 139 { 140 ret= -1; 141 goto end; 142 } 143 s->init_buf=buf; 144 buf=NULL; 145 } 146 147 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 148 149 ssl3_init_finished_mac(s); 150 151 s->state=SSL23_ST_CW_CLNT_HELLO_A; 152 s->ctx->stats.sess_connect++; 153 s->init_num=0; 154 break; 155 156 case SSL23_ST_CW_CLNT_HELLO_A: 157 case SSL23_ST_CW_CLNT_HELLO_B: 158 159 s->shutdown=0; 160 ret=ssl23_client_hello(s); 161 if (ret <= 0) goto end; 162 s->state=SSL23_ST_CR_SRVR_HELLO_A; 163 s->init_num=0; 164 165 break; 166 167 case SSL23_ST_CR_SRVR_HELLO_A: 168 case SSL23_ST_CR_SRVR_HELLO_B: 169 ret=ssl23_get_server_hello(s); 170 if (ret >= 0) cb=NULL; 171 goto end; 172 /* break; */ 173 174 default: 175 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE); 176 ret= -1; 177 goto end; 178 /* break; */ 179 } 180 181 if (s->debug) { (void)BIO_flush(s->wbio); } 182 183 if ((cb != NULL) && (s->state != state)) 184 { 185 new_state=s->state; 186 s->state=state; 187 cb(s,SSL_CB_CONNECT_LOOP,1); 188 s->state=new_state; 189 } 190 } 191end: 192 s->in_handshake--; 193 if (buf != NULL) 194 BUF_MEM_free(buf); 195 if (cb != NULL) 196 cb(s,SSL_CB_CONNECT_EXIT,ret); 197 return(ret); 198 } 199 200 201static int ssl23_client_hello(SSL *s) 202 { 203 unsigned char *buf; 204 unsigned char *p,*d; 205 int i,j,ch_len; 206 unsigned long Time,l; 207 int ssl2_compat; 208 int version = 0, version_major, version_minor; 209 SSL_COMP *comp; 210 int ret; 211 212 ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1; 213 214 if (!(s->options & SSL_OP_NO_TLSv1)) 215 { 216 version = TLS1_VERSION; 217 } 218 else if (!(s->options & SSL_OP_NO_SSLv3)) 219 { 220 version = SSL3_VERSION; 221 } 222 else if (!(s->options & SSL_OP_NO_SSLv2)) 223 { 224 version = SSL2_VERSION; 225 } 226 227 buf=(unsigned char *)s->init_buf->data; 228 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) 229 { 230#if 0 231 /* don't reuse session-id's */ 232 if (!ssl_get_new_session(s,0)) 233 { 234 return(-1); 235 } 236#endif 237 238 p=s->s3->client_random; 239 Time=(unsigned long)time(NULL); /* Time */ 240 l2n(Time,p); 241 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0) 242 return -1; 243 244 if (version == TLS1_VERSION) 245 { 246 version_major = TLS1_VERSION_MAJOR; 247 version_minor = TLS1_VERSION_MINOR; 248 } 249 else if (version == SSL3_VERSION) 250 { 251 version_major = SSL3_VERSION_MAJOR; 252 version_minor = SSL3_VERSION_MINOR; 253 } 254 else if (version == SSL2_VERSION) 255 { 256 version_major = SSL2_VERSION_MAJOR; 257 version_minor = SSL2_VERSION_MINOR; 258 } 259 else 260 { 261 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); 262 return(-1); 263 } 264 265 s->client_version = version; 266 267 if (ssl2_compat) 268 { 269 /* create SSL 2.0 compatible Client Hello */ 270 271 /* two byte record header will be written last */ 272 d = &(buf[2]); 273 p = d + 9; /* leave space for message type, version, individual length fields */ 274 275 *(d++) = SSL2_MT_CLIENT_HELLO; 276 *(d++) = version_major; 277 *(d++) = version_minor; 278 279 /* Ciphers supported */ 280 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0); 281 if (i == 0) 282 { 283 /* no ciphers */ 284 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 285 return -1; 286 } 287 s2n(i,d); 288 p+=i; 289 290 /* put in the session-id length (zero since there is no reuse) */ 291#if 0 292 s->session->session_id_length=0; 293#endif 294 s2n(0,d); 295 296 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 297 ch_len=SSL2_CHALLENGE_LENGTH; 298 else 299 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 300 301 /* write out sslv2 challenge */ 302 if (SSL3_RANDOM_SIZE < ch_len) 303 i=SSL3_RANDOM_SIZE; 304 else 305 i=ch_len; 306 s2n(i,d); 307 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); 308 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0) 309 return -1; 310 311 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 312 p+=i; 313 314 i= p- &(buf[2]); 315 buf[0]=((i>>8)&0xff)|0x80; 316 buf[1]=(i&0xff); 317 318 /* number of bytes to write */ 319 s->init_num=i+2; 320 s->init_off=0; 321 322 ssl3_finish_mac(s,&(buf[2]),i); 323 } 324 else 325 { 326 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 327 328 /* do the record header (5 bytes) and handshake message header (4 bytes) last */ 329 d = p = &(buf[9]); 330 331 *(p++) = version_major; 332 *(p++) = version_minor; 333 334 /* Random stuff */ 335 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 336 p += SSL3_RANDOM_SIZE; 337 338 /* Session ID (zero since there is no reuse) */ 339 *(p++) = 0; 340 341 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 342 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char); 343 if (i == 0) 344 { 345 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 346 return -1; 347 } 348 s2n(i,p); 349 p+=i; 350 351 /* COMPRESSION */ 352 if (s->ctx->comp_methods == NULL) 353 j=0; 354 else 355 j=sk_SSL_COMP_num(s->ctx->comp_methods); 356 *(p++)=1+j; 357 for (i=0; i<j; i++) 358 { 359 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 360 *(p++)=comp->id; 361 } 362 *(p++)=0; /* Add the NULL method */ 363 364 l = p-d; 365 *p = 42; 366 367 /* fill in 4-byte handshake header */ 368 d=&(buf[5]); 369 *(d++)=SSL3_MT_CLIENT_HELLO; 370 l2n3(l,d); 371 372 l += 4; 373 374 if (l > SSL3_RT_MAX_PLAIN_LENGTH) 375 { 376 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 377 return -1; 378 } 379 380 /* fill in 5-byte record header */ 381 d=buf; 382 *(d++) = SSL3_RT_HANDSHAKE; 383 *(d++) = version_major; 384 *(d++) = version_minor; /* arguably we should send the *lowest* suported version here 385 * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */ 386 s2n((int)l,d); 387 388 /* number of bytes to write */ 389 s->init_num=p-buf; 390 s->init_off=0; 391 392 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5); 393 } 394 395 s->state=SSL23_ST_CW_CLNT_HELLO_B; 396 s->init_off=0; 397 } 398 399 /* SSL3_ST_CW_CLNT_HELLO_B */ 400 ret = ssl23_write_bytes(s); 401 402 if ((ret >= 2) && s->msg_callback) 403 { 404 /* Client Hello has been sent; tell msg_callback */ 405 406 if (ssl2_compat) 407 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); 408 else 409 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg); 410 } 411 412 return ret; 413 } 414 415static int ssl23_get_server_hello(SSL *s) 416 { 417 char buf[8]; 418 unsigned char *p; 419 int i; 420 int n; 421 422 n=ssl23_read_bytes(s,7); 423 424 if (n != 7) return(n); 425 p=s->packet; 426 427 memcpy(buf,p,n); 428 429 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 430 (p[5] == 0x00) && (p[6] == 0x02)) 431 { 432#ifdef OPENSSL_NO_SSL2 433 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 434 goto err; 435#else 436 /* we are talking sslv2 */ 437 /* we need to clean up the SSLv3 setup and put in the 438 * sslv2 stuff. */ 439 int ch_len; 440 441 if (s->options & SSL_OP_NO_SSLv2) 442 { 443 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 444 goto err; 445 } 446 if (s->s2 == NULL) 447 { 448 if (!ssl2_new(s)) 449 goto err; 450 } 451 else 452 ssl2_clear(s); 453 454 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 455 ch_len=SSL2_CHALLENGE_LENGTH; 456 else 457 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 458 459 /* write out sslv2 challenge */ 460 i=(SSL3_RANDOM_SIZE < ch_len) 461 ?SSL3_RANDOM_SIZE:ch_len; 462 s->s2->challenge_length=i; 463 memcpy(s->s2->challenge, 464 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 465 466 if (s->s3 != NULL) ssl3_free(s); 467 468 if (!BUF_MEM_grow_clean(s->init_buf, 469 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 470 { 471 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); 472 goto err; 473 } 474 475 s->state=SSL2_ST_GET_SERVER_HELLO_A; 476 if (!(s->client_version == SSL2_VERSION)) 477 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ 478 s->s2->ssl2_rollback=1; 479 480 /* setup the 5 bytes we have read so we get them from 481 * the sslv2 buffer */ 482 s->rstate=SSL_ST_READ_HEADER; 483 s->packet_length=n; 484 s->packet= &(s->s2->rbuf[0]); 485 memcpy(s->packet,buf,n); 486 s->s2->rbuf_left=n; 487 s->s2->rbuf_offs=0; 488 489 /* we have already written one */ 490 s->s2->write_sequence=1; 491 492 s->method=SSLv2_client_method(); 493 s->handshake_func=s->method->ssl_connect; 494#endif 495 } 496 else if ((p[0] == SSL3_RT_HANDSHAKE) && 497 (p[1] == SSL3_VERSION_MAJOR) && 498 ((p[2] == SSL3_VERSION_MINOR) || 499 (p[2] == TLS1_VERSION_MINOR)) && 500 (p[5] == SSL3_MT_SERVER_HELLO)) 501 { 502 /* we have sslv3 or tls1 */ 503 504 if (!ssl_init_wbio_buffer(s,1)) goto err; 505 506 /* we are in this state */ 507 s->state=SSL3_ST_CR_SRVR_HELLO_A; 508 509 /* put the 5 bytes we have read into the input buffer 510 * for SSLv3 */ 511 s->rstate=SSL_ST_READ_HEADER; 512 s->packet_length=n; 513 s->packet= &(s->s3->rbuf.buf[0]); 514 memcpy(s->packet,buf,n); 515 s->s3->rbuf.left=n; 516 s->s3->rbuf.offset=0; 517 518 if ((p[2] == SSL3_VERSION_MINOR) && 519 !(s->options & SSL_OP_NO_SSLv3)) 520 { 521 s->version=SSL3_VERSION; 522 s->method=SSLv3_client_method(); 523 } 524 else if ((p[2] == TLS1_VERSION_MINOR) && 525 !(s->options & SSL_OP_NO_TLSv1)) 526 { 527 s->version=TLS1_VERSION; 528 s->method=TLSv1_client_method(); 529 } 530 else 531 { 532 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 533 goto err; 534 } 535 536 s->handshake_func=s->method->ssl_connect; 537 } 538 else if ((p[0] == SSL3_RT_ALERT) && 539 (p[1] == SSL3_VERSION_MAJOR) && 540 ((p[2] == SSL3_VERSION_MINOR) || 541 (p[2] == TLS1_VERSION_MINOR)) && 542 (p[3] == 0) && 543 (p[4] == 2)) 544 { 545 void (*cb)(const SSL *ssl,int type,int val)=NULL; 546 int j; 547 548 /* An alert */ 549 if (s->info_callback != NULL) 550 cb=s->info_callback; 551 else if (s->ctx->info_callback != NULL) 552 cb=s->ctx->info_callback; 553 554 i=p[5]; 555 if (cb != NULL) 556 { 557 j=(i<<8)|p[6]; 558 cb(s,SSL_CB_READ_ALERT,j); 559 } 560 561 s->rwstate=SSL_NOTHING; 562 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); 563 goto err; 564 } 565 else 566 { 567 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); 568 goto err; 569 } 570 s->init_num=0; 571 572 /* Since, if we are sending a ssl23 client hello, we are not 573 * reusing a session-id */ 574 if (!ssl_get_new_session(s,0)) 575 goto err; 576 577 return(SSL_connect(s)); 578err: 579 return(-1); 580 } 581 582