s23_clnt.c revision bdfb8ad83da0647e9b9a32792598e8ce7ba3ef4d
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#ifndef OPENSSL_NO_TLSEXT 227 if (version != SSL2_VERSION) 228 { 229 /* have to disable SSL 2.0 compatibility if we need TLS extensions */ 230 231 if (s->tlsext_hostname != NULL) 232 ssl2_compat = 0; 233 if (s->tlsext_status_type != -1) 234 ssl2_compat = 0; 235 } 236#endif 237 238 buf=(unsigned char *)s->init_buf->data; 239 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) 240 { 241#if 0 242 /* don't reuse session-id's */ 243 if (!ssl_get_new_session(s,0)) 244 { 245 return(-1); 246 } 247#endif 248 249 p=s->s3->client_random; 250 Time=(unsigned long)time(NULL); /* Time */ 251 l2n(Time,p); 252 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0) 253 return -1; 254 255 if (version == TLS1_VERSION) 256 { 257 version_major = TLS1_VERSION_MAJOR; 258 version_minor = TLS1_VERSION_MINOR; 259 } 260 else if (version == SSL3_VERSION) 261 { 262 version_major = SSL3_VERSION_MAJOR; 263 version_minor = SSL3_VERSION_MINOR; 264 } 265 else if (version == SSL2_VERSION) 266 { 267 version_major = SSL2_VERSION_MAJOR; 268 version_minor = SSL2_VERSION_MINOR; 269 } 270 else 271 { 272 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); 273 return(-1); 274 } 275 276 s->client_version = version; 277 278 if (ssl2_compat) 279 { 280 /* create SSL 2.0 compatible Client Hello */ 281 282 /* two byte record header will be written last */ 283 d = &(buf[2]); 284 p = d + 9; /* leave space for message type, version, individual length fields */ 285 286 *(d++) = SSL2_MT_CLIENT_HELLO; 287 *(d++) = version_major; 288 *(d++) = version_minor; 289 290 /* Ciphers supported */ 291 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0); 292 if (i == 0) 293 { 294 /* no ciphers */ 295 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 296 return -1; 297 } 298 s2n(i,d); 299 p+=i; 300 301 /* put in the session-id length (zero since there is no reuse) */ 302#if 0 303 s->session->session_id_length=0; 304#endif 305 s2n(0,d); 306 307 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 308 ch_len=SSL2_CHALLENGE_LENGTH; 309 else 310 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 311 312 /* write out sslv2 challenge */ 313 if (SSL3_RANDOM_SIZE < ch_len) 314 i=SSL3_RANDOM_SIZE; 315 else 316 i=ch_len; 317 s2n(i,d); 318 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); 319 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0) 320 return -1; 321 322 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 323 p+=i; 324 325 i= p- &(buf[2]); 326 buf[0]=((i>>8)&0xff)|0x80; 327 buf[1]=(i&0xff); 328 329 /* number of bytes to write */ 330 s->init_num=i+2; 331 s->init_off=0; 332 333 ssl3_finish_mac(s,&(buf[2]),i); 334 } 335 else 336 { 337 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 338 339 /* do the record header (5 bytes) and handshake message header (4 bytes) last */ 340 d = p = &(buf[9]); 341 342 *(p++) = version_major; 343 *(p++) = version_minor; 344 345 /* Random stuff */ 346 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 347 p += SSL3_RANDOM_SIZE; 348 349 /* Session ID (zero since there is no reuse) */ 350 *(p++) = 0; 351 352 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 353 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char); 354 if (i == 0) 355 { 356 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 357 return -1; 358 } 359 s2n(i,p); 360 p+=i; 361 362 /* COMPRESSION */ 363 if (s->ctx->comp_methods == NULL) 364 j=0; 365 else 366 j=sk_SSL_COMP_num(s->ctx->comp_methods); 367 *(p++)=1+j; 368 for (i=0; i<j; i++) 369 { 370 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 371 *(p++)=comp->id; 372 } 373 *(p++)=0; /* Add the NULL method */ 374#ifndef OPENSSL_NO_TLSEXT 375 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 376 { 377 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 378 return -1; 379 } 380#endif 381 382 l = p-d; 383 *p = 42; 384 385 /* fill in 4-byte handshake header */ 386 d=&(buf[5]); 387 *(d++)=SSL3_MT_CLIENT_HELLO; 388 l2n3(l,d); 389 390 l += 4; 391 392 if (l > SSL3_RT_MAX_PLAIN_LENGTH) 393 { 394 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 395 return -1; 396 } 397 398 /* fill in 5-byte record header */ 399 d=buf; 400 *(d++) = SSL3_RT_HANDSHAKE; 401 *(d++) = version_major; 402 *(d++) = version_minor; /* arguably we should send the *lowest* suported version here 403 * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */ 404 s2n((int)l,d); 405 406 /* number of bytes to write */ 407 s->init_num=p-buf; 408 s->init_off=0; 409 410 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5); 411 } 412 413 s->state=SSL23_ST_CW_CLNT_HELLO_B; 414 s->init_off=0; 415 } 416 417 /* SSL3_ST_CW_CLNT_HELLO_B */ 418 ret = ssl23_write_bytes(s); 419 420 if ((ret >= 2) && s->msg_callback) 421 { 422 /* Client Hello has been sent; tell msg_callback */ 423 424 if (ssl2_compat) 425 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); 426 else 427 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg); 428 } 429 430 return ret; 431 } 432 433static int ssl23_get_server_hello(SSL *s) 434 { 435 char buf[8]; 436 unsigned char *p; 437 int i; 438 int n; 439 440 n=ssl23_read_bytes(s,7); 441 442 if (n != 7) return(n); 443 p=s->packet; 444 445 memcpy(buf,p,n); 446 447 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 448 (p[5] == 0x00) && (p[6] == 0x02)) 449 { 450#ifdef OPENSSL_NO_SSL2 451 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 452 goto err; 453#else 454 /* we are talking sslv2 */ 455 /* we need to clean up the SSLv3 setup and put in the 456 * sslv2 stuff. */ 457 int ch_len; 458 459 if (s->options & SSL_OP_NO_SSLv2) 460 { 461 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 462 goto err; 463 } 464 if (s->s2 == NULL) 465 { 466 if (!ssl2_new(s)) 467 goto err; 468 } 469 else 470 ssl2_clear(s); 471 472 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 473 ch_len=SSL2_CHALLENGE_LENGTH; 474 else 475 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 476 477 /* write out sslv2 challenge */ 478 i=(SSL3_RANDOM_SIZE < ch_len) 479 ?SSL3_RANDOM_SIZE:ch_len; 480 s->s2->challenge_length=i; 481 memcpy(s->s2->challenge, 482 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 483 484 if (s->s3 != NULL) ssl3_free(s); 485 486 if (!BUF_MEM_grow_clean(s->init_buf, 487 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 488 { 489 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); 490 goto err; 491 } 492 493 s->state=SSL2_ST_GET_SERVER_HELLO_A; 494 if (!(s->client_version == SSL2_VERSION)) 495 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ 496 s->s2->ssl2_rollback=1; 497 498 /* setup the 5 bytes we have read so we get them from 499 * the sslv2 buffer */ 500 s->rstate=SSL_ST_READ_HEADER; 501 s->packet_length=n; 502 s->packet= &(s->s2->rbuf[0]); 503 memcpy(s->packet,buf,n); 504 s->s2->rbuf_left=n; 505 s->s2->rbuf_offs=0; 506 507 /* we have already written one */ 508 s->s2->write_sequence=1; 509 510 s->method=SSLv2_client_method(); 511 s->handshake_func=s->method->ssl_connect; 512#endif 513 } 514 else if ((p[0] == SSL3_RT_HANDSHAKE) && 515 (p[1] == SSL3_VERSION_MAJOR) && 516 ((p[2] == SSL3_VERSION_MINOR) || 517 (p[2] == TLS1_VERSION_MINOR)) && 518 (p[5] == SSL3_MT_SERVER_HELLO)) 519 { 520 /* we have sslv3 or tls1 */ 521 522 if (!ssl_init_wbio_buffer(s,1)) goto err; 523 524 /* we are in this state */ 525 s->state=SSL3_ST_CR_SRVR_HELLO_A; 526 527 /* put the 5 bytes we have read into the input buffer 528 * for SSLv3 */ 529 s->rstate=SSL_ST_READ_HEADER; 530 s->packet_length=n; 531 s->packet= &(s->s3->rbuf.buf[0]); 532 memcpy(s->packet,buf,n); 533 s->s3->rbuf.left=n; 534 s->s3->rbuf.offset=0; 535 536 if ((p[2] == SSL3_VERSION_MINOR) && 537 !(s->options & SSL_OP_NO_SSLv3)) 538 { 539 s->version=SSL3_VERSION; 540 s->method=SSLv3_client_method(); 541 } 542 else if ((p[2] == TLS1_VERSION_MINOR) && 543 !(s->options & SSL_OP_NO_TLSv1)) 544 { 545 s->version=TLS1_VERSION; 546 s->method=TLSv1_client_method(); 547 } 548 else 549 { 550 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 551 goto err; 552 } 553 554 s->handshake_func=s->method->ssl_connect; 555 } 556 else if ((p[0] == SSL3_RT_ALERT) && 557 (p[1] == SSL3_VERSION_MAJOR) && 558 ((p[2] == SSL3_VERSION_MINOR) || 559 (p[2] == TLS1_VERSION_MINOR)) && 560 (p[3] == 0) && 561 (p[4] == 2)) 562 { 563 void (*cb)(const SSL *ssl,int type,int val)=NULL; 564 int j; 565 566 /* An alert */ 567 if (s->info_callback != NULL) 568 cb=s->info_callback; 569 else if (s->ctx->info_callback != NULL) 570 cb=s->ctx->info_callback; 571 572 i=p[5]; 573 if (cb != NULL) 574 { 575 j=(i<<8)|p[6]; 576 cb(s,SSL_CB_READ_ALERT,j); 577 } 578 579 s->rwstate=SSL_NOTHING; 580 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); 581 goto err; 582 } 583 else 584 { 585 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); 586 goto err; 587 } 588 s->init_num=0; 589 590 /* Since, if we are sending a ssl23 client hello, we are not 591 * reusing a session-id */ 592 if (!ssl_get_new_session(s,0)) 593 goto err; 594 595 return(SSL_connect(s)); 596err: 597 return(-1); 598 } 599 600