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 83SSL_METHOD *SSLv23_client_method(void) 84 { 85 static int init=1; 86 static SSL_METHOD SSLv23_client_data; 87 88 if (init) 89 { 90 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD); 91 92 if (init) 93 { 94 memcpy((char *)&SSLv23_client_data, 95 (char *)sslv23_base_method(),sizeof(SSL_METHOD)); 96 SSLv23_client_data.ssl_connect=ssl23_connect; 97 SSLv23_client_data.get_ssl_method=ssl23_get_client_method; 98 init=0; 99 } 100 101 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD); 102 } 103 return(&SSLv23_client_data); 104 } 105 106int ssl23_connect(SSL *s) 107 { 108 BUF_MEM *buf=NULL; 109 unsigned long Time=time(NULL); 110 void (*cb)(const SSL *ssl,int type,int val)=NULL; 111 int ret= -1; 112 int new_state,state; 113 114 RAND_add(&Time,sizeof(Time),0); 115 ERR_clear_error(); 116 clear_sys_error(); 117 118 if (s->info_callback != NULL) 119 cb=s->info_callback; 120 else if (s->ctx->info_callback != NULL) 121 cb=s->ctx->info_callback; 122 123 s->in_handshake++; 124 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 125 126 for (;;) 127 { 128 state=s->state; 129 130 switch(s->state) 131 { 132 case SSL_ST_BEFORE: 133 case SSL_ST_CONNECT: 134 case SSL_ST_BEFORE|SSL_ST_CONNECT: 135 case SSL_ST_OK|SSL_ST_CONNECT: 136 137 if (s->session != NULL) 138 { 139 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE); 140 ret= -1; 141 goto end; 142 } 143 s->server=0; 144 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 145 146 /* s->version=TLS1_VERSION; */ 147 s->type=SSL_ST_CONNECT; 148 149 if (s->init_buf == NULL) 150 { 151 if ((buf=BUF_MEM_new()) == NULL) 152 { 153 ret= -1; 154 goto end; 155 } 156 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 157 { 158 ret= -1; 159 goto end; 160 } 161 s->init_buf=buf; 162 buf=NULL; 163 } 164 165 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 166 167 ssl3_init_finished_mac(s); 168 169 s->state=SSL23_ST_CW_CLNT_HELLO_A; 170 s->ctx->stats.sess_connect++; 171 s->init_num=0; 172 break; 173 174 case SSL23_ST_CW_CLNT_HELLO_A: 175 case SSL23_ST_CW_CLNT_HELLO_B: 176 177 s->shutdown=0; 178 ret=ssl23_client_hello(s); 179 if (ret <= 0) goto end; 180 s->state=SSL23_ST_CR_SRVR_HELLO_A; 181 s->init_num=0; 182 183 break; 184 185 case SSL23_ST_CR_SRVR_HELLO_A: 186 case SSL23_ST_CR_SRVR_HELLO_B: 187 ret=ssl23_get_server_hello(s); 188 if (ret >= 0) cb=NULL; 189 goto end; 190 /* break; */ 191 192 default: 193 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE); 194 ret= -1; 195 goto end; 196 /* break; */ 197 } 198 199 if (s->debug) { (void)BIO_flush(s->wbio); } 200 201 if ((cb != NULL) && (s->state != state)) 202 { 203 new_state=s->state; 204 s->state=state; 205 cb(s,SSL_CB_CONNECT_LOOP,1); 206 s->state=new_state; 207 } 208 } 209end: 210 s->in_handshake--; 211 if (buf != NULL) 212 BUF_MEM_free(buf); 213 if (cb != NULL) 214 cb(s,SSL_CB_CONNECT_EXIT,ret); 215 return(ret); 216 } 217 218 219static int ssl23_client_hello(SSL *s) 220 { 221 unsigned char *buf; 222 unsigned char *p,*d; 223 int i,ch_len; 224 int ret; 225 226 buf=(unsigned char *)s->init_buf->data; 227 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) 228 { 229#if 0 230 /* don't reuse session-id's */ 231 if (!ssl_get_new_session(s,0)) 232 { 233 return(-1); 234 } 235#endif 236 237 p=s->s3->client_random; 238 if(RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE) <= 0) 239 return -1; 240 241 /* Do the message type and length last */ 242 d= &(buf[2]); 243 p=d+9; 244 245 *(d++)=SSL2_MT_CLIENT_HELLO; 246 if (!(s->options & SSL_OP_NO_TLSv1)) 247 { 248 *(d++)=TLS1_VERSION_MAJOR; 249 *(d++)=TLS1_VERSION_MINOR; 250 s->client_version=TLS1_VERSION; 251 } 252#ifdef OPENSSL_FIPS 253 else if(FIPS_mode()) 254 { 255 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 256 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 257 return -1; 258 } 259#endif 260 else if (!(s->options & SSL_OP_NO_SSLv3)) 261 { 262 *(d++)=SSL3_VERSION_MAJOR; 263 *(d++)=SSL3_VERSION_MINOR; 264 s->client_version=SSL3_VERSION; 265 } 266 else if (!(s->options & SSL_OP_NO_SSLv2)) 267 { 268 *(d++)=SSL2_VERSION_MAJOR; 269 *(d++)=SSL2_VERSION_MINOR; 270 s->client_version=SSL2_VERSION; 271 } 272 else 273 { 274 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); 275 return(-1); 276 } 277 278 /* Ciphers supported */ 279 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p); 280 if (i == 0) 281 { 282 /* no ciphers */ 283 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 284 return(-1); 285 } 286 s2n(i,d); 287 p+=i; 288 289 /* put in the session-id, zero since there is no 290 * 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 s->state=SSL23_ST_CW_CLNT_HELLO_B; 319 /* number of bytes to write */ 320 s->init_num=i+2; 321 s->init_off=0; 322 323 ssl3_finish_mac(s,&(buf[2]),i); 324 } 325 326 /* SSL3_ST_CW_CLNT_HELLO_B */ 327 ret = ssl23_write_bytes(s); 328 if (ret >= 2) 329 if (s->msg_callback) 330 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); /* CLIENT-HELLO */ 331 return ret; 332 } 333 334static int ssl23_get_server_hello(SSL *s) 335 { 336 char buf[8]; 337 unsigned char *p; 338 int i; 339 int n; 340 341 n=ssl23_read_bytes(s,7); 342 343 if (n != 7) return(n); 344 p=s->packet; 345 346 memcpy(buf,p,n); 347 348 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 349 (p[5] == 0x00) && (p[6] == 0x02)) 350 { 351#ifdef OPENSSL_NO_SSL2 352 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 353 goto err; 354#else 355 /* we are talking sslv2 */ 356 /* we need to clean up the SSLv3 setup and put in the 357 * sslv2 stuff. */ 358 int ch_len; 359 360 if (s->options & SSL_OP_NO_SSLv2) 361 { 362 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 363 goto err; 364 } 365 if (s->s2 == NULL) 366 { 367 if (!ssl2_new(s)) 368 goto err; 369 } 370 else 371 ssl2_clear(s); 372 373 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 374 ch_len=SSL2_CHALLENGE_LENGTH; 375 else 376 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 377 378 /* write out sslv2 challenge */ 379 i=(SSL3_RANDOM_SIZE < ch_len) 380 ?SSL3_RANDOM_SIZE:ch_len; 381 s->s2->challenge_length=i; 382 memcpy(s->s2->challenge, 383 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 384 385 if (s->s3 != NULL) ssl3_free(s); 386 387 if (!BUF_MEM_grow_clean(s->init_buf, 388 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 389 { 390 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); 391 goto err; 392 } 393 394 s->state=SSL2_ST_GET_SERVER_HELLO_A; 395 if (!(s->client_version == SSL2_VERSION)) 396 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ 397 s->s2->ssl2_rollback=1; 398 399 /* setup the 5 bytes we have read so we get them from 400 * the sslv2 buffer */ 401 s->rstate=SSL_ST_READ_HEADER; 402 s->packet_length=n; 403 s->packet= &(s->s2->rbuf[0]); 404 memcpy(s->packet,buf,n); 405 s->s2->rbuf_left=n; 406 s->s2->rbuf_offs=0; 407 408 /* we have already written one */ 409 s->s2->write_sequence=1; 410 411 s->method=SSLv2_client_method(); 412 s->handshake_func=s->method->ssl_connect; 413#endif 414 } 415 else if ((p[0] == SSL3_RT_HANDSHAKE) && 416 (p[1] == SSL3_VERSION_MAJOR) && 417 ((p[2] == SSL3_VERSION_MINOR) || 418 (p[2] == TLS1_VERSION_MINOR)) && 419 (p[5] == SSL3_MT_SERVER_HELLO)) 420 { 421 /* we have sslv3 or tls1 */ 422 423 if (!ssl_init_wbio_buffer(s,1)) goto err; 424 425 /* we are in this state */ 426 s->state=SSL3_ST_CR_SRVR_HELLO_A; 427 428 /* put the 5 bytes we have read into the input buffer 429 * for SSLv3 */ 430 s->rstate=SSL_ST_READ_HEADER; 431 s->packet_length=n; 432 s->packet= &(s->s3->rbuf.buf[0]); 433 memcpy(s->packet,buf,n); 434 s->s3->rbuf.left=n; 435 s->s3->rbuf.offset=0; 436 437 if ((p[2] == SSL3_VERSION_MINOR) && 438 !(s->options & SSL_OP_NO_SSLv3)) 439 { 440#ifdef OPENSSL_FIPS 441 if(FIPS_mode()) 442 { 443 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, 444 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 445 goto err; 446 } 447#endif 448 s->version=SSL3_VERSION; 449 s->method=SSLv3_client_method(); 450 } 451 else if ((p[2] == TLS1_VERSION_MINOR) && 452 !(s->options & SSL_OP_NO_TLSv1)) 453 { 454 s->version=TLS1_VERSION; 455 s->method=TLSv1_client_method(); 456 } 457 else 458 { 459 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 460 goto err; 461 } 462 463 s->handshake_func=s->method->ssl_connect; 464 } 465 else if ((p[0] == SSL3_RT_ALERT) && 466 (p[1] == SSL3_VERSION_MAJOR) && 467 ((p[2] == SSL3_VERSION_MINOR) || 468 (p[2] == TLS1_VERSION_MINOR)) && 469 (p[3] == 0) && 470 (p[4] == 2)) 471 { 472 void (*cb)(const SSL *ssl,int type,int val)=NULL; 473 int j; 474 475 /* An alert */ 476 if (s->info_callback != NULL) 477 cb=s->info_callback; 478 else if (s->ctx->info_callback != NULL) 479 cb=s->ctx->info_callback; 480 481 i=p[5]; 482 if (cb != NULL) 483 { 484 j=(i<<8)|p[6]; 485 cb(s,SSL_CB_READ_ALERT,j); 486 } 487 488 s->rwstate=SSL_NOTHING; 489 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); 490 goto err; 491 } 492 else 493 { 494 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); 495 goto err; 496 } 497 s->init_num=0; 498 499 /* Since, if we are sending a ssl23 client hello, we are not 500 * reusing a session-id */ 501 if (!ssl_get_new_session(s,0)) 502 goto err; 503 504 s->first_packet=1; 505 return(SSL_connect(s)); 506err: 507 return(-1); 508 } 509 510