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,ch_len; 206 unsigned long Time,l; 207 int ssl2_compat; 208 int version = 0, version_major, version_minor; 209#ifndef OPENSSL_NO_COMP 210 int j; 211 SSL_COMP *comp; 212#endif 213 int ret; 214 215 ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1; 216 217 if (!(s->options & SSL_OP_NO_TLSv1)) 218 { 219 version = TLS1_VERSION; 220 } 221 else if (!(s->options & SSL_OP_NO_SSLv3)) 222 { 223 version = SSL3_VERSION; 224 } 225 else if (!(s->options & SSL_OP_NO_SSLv2)) 226 { 227 version = SSL2_VERSION; 228 } 229#ifndef OPENSSL_NO_TLSEXT 230 if (version != SSL2_VERSION) 231 { 232 /* have to disable SSL 2.0 compatibility if we need TLS extensions */ 233 234 if (s->tlsext_hostname != NULL) 235 ssl2_compat = 0; 236 if (s->tlsext_status_type != -1) 237 ssl2_compat = 0; 238 } 239#endif 240 241 buf=(unsigned char *)s->init_buf->data; 242 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) 243 { 244#if 0 245 /* don't reuse session-id's */ 246 if (!ssl_get_new_session(s,0)) 247 { 248 return(-1); 249 } 250#endif 251 252 p=s->s3->client_random; 253 Time=(unsigned long)time(NULL); /* Time */ 254 l2n(Time,p); 255 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0) 256 return -1; 257 258 if (version == TLS1_VERSION) 259 { 260 version_major = TLS1_VERSION_MAJOR; 261 version_minor = TLS1_VERSION_MINOR; 262 } 263#ifdef OPENSSL_FIPS 264 else if(FIPS_mode()) 265 { 266 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 267 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 268 return -1; 269 } 270#endif 271 else if (version == SSL3_VERSION) 272 { 273 version_major = SSL3_VERSION_MAJOR; 274 version_minor = SSL3_VERSION_MINOR; 275 } 276 else if (version == SSL2_VERSION) 277 { 278 version_major = SSL2_VERSION_MAJOR; 279 version_minor = SSL2_VERSION_MINOR; 280 } 281 else 282 { 283 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); 284 return(-1); 285 } 286 287 s->client_version = version; 288 289 if (ssl2_compat) 290 { 291 /* create SSL 2.0 compatible Client Hello */ 292 293 /* two byte record header will be written last */ 294 d = &(buf[2]); 295 p = d + 9; /* leave space for message type, version, individual length fields */ 296 297 *(d++) = SSL2_MT_CLIENT_HELLO; 298 *(d++) = version_major; 299 *(d++) = version_minor; 300 301 /* Ciphers supported */ 302 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0); 303 if (i == 0) 304 { 305 /* no ciphers */ 306 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 307 return -1; 308 } 309 s2n(i,d); 310 p+=i; 311 312 /* put in the session-id length (zero since there is no reuse) */ 313#if 0 314 s->session->session_id_length=0; 315#endif 316 s2n(0,d); 317 318 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 319 ch_len=SSL2_CHALLENGE_LENGTH; 320 else 321 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 322 323 /* write out sslv2 challenge */ 324 if (SSL3_RANDOM_SIZE < ch_len) 325 i=SSL3_RANDOM_SIZE; 326 else 327 i=ch_len; 328 s2n(i,d); 329 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); 330 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0) 331 return -1; 332 333 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 334 p+=i; 335 336 i= p- &(buf[2]); 337 buf[0]=((i>>8)&0xff)|0x80; 338 buf[1]=(i&0xff); 339 340 /* number of bytes to write */ 341 s->init_num=i+2; 342 s->init_off=0; 343 344 ssl3_finish_mac(s,&(buf[2]),i); 345 } 346 else 347 { 348 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 349 350 /* do the record header (5 bytes) and handshake message header (4 bytes) last */ 351 d = p = &(buf[9]); 352 353 *(p++) = version_major; 354 *(p++) = version_minor; 355 356 /* Random stuff */ 357 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 358 p += SSL3_RANDOM_SIZE; 359 360 /* Session ID (zero since there is no reuse) */ 361 *(p++) = 0; 362 363 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 364 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char); 365 if (i == 0) 366 { 367 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 368 return -1; 369 } 370 s2n(i,p); 371 p+=i; 372#ifdef OPENSSL_NO_COMP 373 *(p++)=1; 374#else 375 /* COMPRESSION */ 376 if (s->ctx->comp_methods == NULL) 377 j=0; 378 else 379 j=sk_SSL_COMP_num(s->ctx->comp_methods); 380 *(p++)=1+j; 381 for (i=0; i<j; i++) 382 { 383 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 384 *(p++)=comp->id; 385 } 386#endif 387 *(p++)=0; /* Add the NULL method */ 388#ifndef OPENSSL_NO_TLSEXT 389 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 390 { 391 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 392 return -1; 393 } 394#endif 395 396 l = p-d; 397 *p = 42; 398 399 /* fill in 4-byte handshake header */ 400 d=&(buf[5]); 401 *(d++)=SSL3_MT_CLIENT_HELLO; 402 l2n3(l,d); 403 404 l += 4; 405 406 if (l > SSL3_RT_MAX_PLAIN_LENGTH) 407 { 408 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 409 return -1; 410 } 411 412 /* fill in 5-byte record header */ 413 d=buf; 414 *(d++) = SSL3_RT_HANDSHAKE; 415 *(d++) = version_major; 416 *(d++) = version_minor; /* arguably we should send the *lowest* suported version here 417 * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */ 418 s2n((int)l,d); 419 420 /* number of bytes to write */ 421 s->init_num=p-buf; 422 s->init_off=0; 423 424 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5); 425 } 426 427 s->state=SSL23_ST_CW_CLNT_HELLO_B; 428 s->init_off=0; 429 } 430 431 /* SSL3_ST_CW_CLNT_HELLO_B */ 432 ret = ssl23_write_bytes(s); 433 434 if ((ret >= 2) && s->msg_callback) 435 { 436 /* Client Hello has been sent; tell msg_callback */ 437 438 if (ssl2_compat) 439 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); 440 else 441 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg); 442 } 443 444 return ret; 445 } 446 447static int ssl23_get_server_hello(SSL *s) 448 { 449 char buf[8]; 450 unsigned char *p; 451 int i; 452 int n; 453 454 n=ssl23_read_bytes(s,7); 455 456 if (n != 7) return(n); 457 p=s->packet; 458 459 memcpy(buf,p,n); 460 461 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 462 (p[5] == 0x00) && (p[6] == 0x02)) 463 { 464#ifdef OPENSSL_NO_SSL2 465 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 466 goto err; 467#else 468 /* we are talking sslv2 */ 469 /* we need to clean up the SSLv3 setup and put in the 470 * sslv2 stuff. */ 471 int ch_len; 472 473 if (s->options & SSL_OP_NO_SSLv2) 474 { 475 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 476 goto err; 477 } 478 if (s->s2 == NULL) 479 { 480 if (!ssl2_new(s)) 481 goto err; 482 } 483 else 484 ssl2_clear(s); 485 486 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 487 ch_len=SSL2_CHALLENGE_LENGTH; 488 else 489 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 490 491 /* write out sslv2 challenge */ 492 i=(SSL3_RANDOM_SIZE < ch_len) 493 ?SSL3_RANDOM_SIZE:ch_len; 494 s->s2->challenge_length=i; 495 memcpy(s->s2->challenge, 496 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 497 498 if (s->s3 != NULL) ssl3_free(s); 499 500 if (!BUF_MEM_grow_clean(s->init_buf, 501 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 502 { 503 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); 504 goto err; 505 } 506 507 s->state=SSL2_ST_GET_SERVER_HELLO_A; 508 if (!(s->client_version == SSL2_VERSION)) 509 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ 510 s->s2->ssl2_rollback=1; 511 512 /* setup the 7 bytes we have read so we get them from 513 * the sslv2 buffer */ 514 s->rstate=SSL_ST_READ_HEADER; 515 s->packet_length=n; 516 s->packet= &(s->s2->rbuf[0]); 517 memcpy(s->packet,buf,n); 518 s->s2->rbuf_left=n; 519 s->s2->rbuf_offs=0; 520 521 /* we have already written one */ 522 s->s2->write_sequence=1; 523 524 s->method=SSLv2_client_method(); 525 s->handshake_func=s->method->ssl_connect; 526#endif 527 } 528 else if (p[1] == SSL3_VERSION_MAJOR && 529 ((p[2] == SSL3_VERSION_MINOR) || 530 (p[2] == TLS1_VERSION_MINOR)) && 531 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || 532 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) 533 { 534 /* we have sslv3 or tls1 (server hello or alert) */ 535 536 if ((p[2] == SSL3_VERSION_MINOR) && 537 !(s->options & SSL_OP_NO_SSLv3)) 538 { 539#ifdef OPENSSL_FIPS 540 if(FIPS_mode()) 541 { 542 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, 543 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 544 goto err; 545 } 546#endif 547 s->version=SSL3_VERSION; 548 s->method=SSLv3_client_method(); 549 } 550 else if ((p[2] == TLS1_VERSION_MINOR) && 551 !(s->options & SSL_OP_NO_TLSv1)) 552 { 553 s->version=TLS1_VERSION; 554 s->method=TLSv1_client_method(); 555 } 556 else 557 { 558 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 559 goto err; 560 } 561 562 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) 563 { 564 /* fatal alert */ 565 566 void (*cb)(const SSL *ssl,int type,int val)=NULL; 567 int j; 568 569 if (s->info_callback != NULL) 570 cb=s->info_callback; 571 else if (s->ctx->info_callback != NULL) 572 cb=s->ctx->info_callback; 573 574 i=p[5]; 575 if (cb != NULL) 576 { 577 j=(i<<8)|p[6]; 578 cb(s,SSL_CB_READ_ALERT,j); 579 } 580 581 if (s->msg_callback) 582 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg); 583 584 s->rwstate=SSL_NOTHING; 585 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); 586 goto err; 587 } 588 589 if (!ssl_init_wbio_buffer(s,1)) goto err; 590 591 /* we are in this state */ 592 s->state=SSL3_ST_CR_SRVR_HELLO_A; 593 594 /* put the 7 bytes we have read into the input buffer 595 * for SSLv3 */ 596 s->rstate=SSL_ST_READ_HEADER; 597 s->packet_length=n; 598 if (s->s3->rbuf.buf == NULL) 599 if (!ssl3_setup_buffers(s)) 600 goto err; 601 s->packet= &(s->s3->rbuf.buf[0]); 602 memcpy(s->packet,buf,n); 603 s->s3->rbuf.left=n; 604 s->s3->rbuf.offset=0; 605 606 s->handshake_func=s->method->ssl_connect; 607 } 608 else 609 { 610 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); 611 goto err; 612 } 613 s->init_num=0; 614 615 /* Since, if we are sending a ssl23 client hello, we are not 616 * reusing a session-id */ 617 if (!ssl_get_new_session(s,0)) 618 goto err; 619 620 return(SSL_connect(s)); 621err: 622 return(-1); 623 } 624 625