s23_clnt.c revision 89840
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 * $FreeBSD: head/crypto/openssl/ssl/s23_clnt.c 89840 2002-01-27 03:17:13Z kris $ 59 */ 60 61#include <stdio.h> 62#include <openssl/buffer.h> 63#include <openssl/rand.h> 64#include <openssl/objects.h> 65#include <openssl/evp.h> 66#include "ssl_locl.h" 67 68static SSL_METHOD *ssl23_get_client_method(int ver); 69static int ssl23_client_hello(SSL *s); 70static int ssl23_get_server_hello(SSL *s); 71static SSL_METHOD *ssl23_get_client_method(int ver) 72 { 73#ifndef NO_SSL2 74 if (ver == SSL2_VERSION) 75 return(SSLv2_client_method()); 76#endif 77 if (ver == SSL3_VERSION) 78 return(SSLv3_client_method()); 79 else if (ver == TLS1_VERSION) 80 return(TLSv1_client_method()); 81 else 82 return(NULL); 83 } 84 85SSL_METHOD *SSLv23_client_method(void) 86 { 87 static int init=1; 88 static SSL_METHOD SSLv23_client_data; 89 90 if (init) 91 { 92 memcpy((char *)&SSLv23_client_data, 93 (char *)sslv23_base_method(),sizeof(SSL_METHOD)); 94 SSLv23_client_data.ssl_connect=ssl23_connect; 95 SSLv23_client_data.get_ssl_method=ssl23_get_client_method; 96 init=0; 97 } 98 return(&SSLv23_client_data); 99 } 100 101int ssl23_connect(SSL *s) 102 { 103 BUF_MEM *buf; 104 unsigned long Time=time(NULL); 105 void (*cb)()=NULL; 106 int ret= -1; 107 int new_state,state; 108 109 RAND_add(&Time,sizeof(Time),0); 110 ERR_clear_error(); 111 clear_sys_error(); 112 113 if (s->info_callback != NULL) 114 cb=s->info_callback; 115 else if (s->ctx->info_callback != NULL) 116 cb=s->ctx->info_callback; 117 118 s->in_handshake++; 119 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 120 121 for (;;) 122 { 123 state=s->state; 124 125 switch(s->state) 126 { 127 case SSL_ST_BEFORE: 128 case SSL_ST_CONNECT: 129 case SSL_ST_BEFORE|SSL_ST_CONNECT: 130 case SSL_ST_OK|SSL_ST_CONNECT: 131 132 if (s->session != NULL) 133 { 134 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE); 135 ret= -1; 136 goto end; 137 } 138 s->server=0; 139 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 140 141 /* s->version=TLS1_VERSION; */ 142 s->type=SSL_ST_CONNECT; 143 144 if (s->init_buf == NULL) 145 { 146 if ((buf=BUF_MEM_new()) == NULL) 147 { 148 ret= -1; 149 goto end; 150 } 151 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 152 { 153 ret= -1; 154 goto end; 155 } 156 s->init_buf=buf; 157 } 158 159 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 160 161 ssl3_init_finished_mac(s); 162 163 s->state=SSL23_ST_CW_CLNT_HELLO_A; 164 s->ctx->stats.sess_connect++; 165 s->init_num=0; 166 break; 167 168 case SSL23_ST_CW_CLNT_HELLO_A: 169 case SSL23_ST_CW_CLNT_HELLO_B: 170 171 s->shutdown=0; 172 ret=ssl23_client_hello(s); 173 if (ret <= 0) goto end; 174 s->state=SSL23_ST_CR_SRVR_HELLO_A; 175 s->init_num=0; 176 177 break; 178 179 case SSL23_ST_CR_SRVR_HELLO_A: 180 case SSL23_ST_CR_SRVR_HELLO_B: 181 ret=ssl23_get_server_hello(s); 182 if (ret >= 0) cb=NULL; 183 goto end; 184 /* break; */ 185 186 default: 187 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE); 188 ret= -1; 189 goto end; 190 /* break; */ 191 } 192 193 if (s->debug) { (void)BIO_flush(s->wbio); } 194 195 if ((cb != NULL) && (s->state != state)) 196 { 197 new_state=s->state; 198 s->state=state; 199 cb(s,SSL_CB_CONNECT_LOOP,1); 200 s->state=new_state; 201 } 202 } 203end: 204 s->in_handshake--; 205 if (cb != NULL) 206 cb(s,SSL_CB_CONNECT_EXIT,ret); 207 return(ret); 208 } 209 210 211static int ssl23_client_hello(SSL *s) 212 { 213 unsigned char *buf; 214 unsigned char *p,*d; 215 int i,ch_len; 216 217 buf=(unsigned char *)s->init_buf->data; 218 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) 219 { 220#if 0 221 /* don't reuse session-id's */ 222 if (!ssl_get_new_session(s,0)) 223 { 224 return(-1); 225 } 226#endif 227 228 p=s->s3->client_random; 229 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE); 230 231 /* Do the message type and length last */ 232 d= &(buf[2]); 233 p=d+9; 234 235 *(d++)=SSL2_MT_CLIENT_HELLO; 236 if (!(s->options & SSL_OP_NO_TLSv1)) 237 { 238 *(d++)=TLS1_VERSION_MAJOR; 239 *(d++)=TLS1_VERSION_MINOR; 240 s->client_version=TLS1_VERSION; 241 } 242 else if (!(s->options & SSL_OP_NO_SSLv3)) 243 { 244 *(d++)=SSL3_VERSION_MAJOR; 245 *(d++)=SSL3_VERSION_MINOR; 246 s->client_version=SSL3_VERSION; 247 } 248 else if (!(s->options & SSL_OP_NO_SSLv2)) 249 { 250 *(d++)=SSL2_VERSION_MAJOR; 251 *(d++)=SSL2_VERSION_MINOR; 252 s->client_version=SSL2_VERSION; 253 } 254 else 255 { 256 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); 257 return(-1); 258 } 259 260 /* Ciphers supported */ 261 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p); 262 if (i == 0) 263 { 264 /* no ciphers */ 265 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 266 return(-1); 267 } 268 s2n(i,d); 269 p+=i; 270 271 /* put in the session-id, zero since there is no 272 * reuse. */ 273#if 0 274 s->session->session_id_length=0; 275#endif 276 s2n(0,d); 277 278 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 279 ch_len=SSL2_CHALLENGE_LENGTH; 280 else 281 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 282 283 /* write out sslv2 challenge */ 284 if (SSL3_RANDOM_SIZE < ch_len) 285 i=SSL3_RANDOM_SIZE; 286 else 287 i=ch_len; 288 s2n(i,d); 289 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); 290 RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 291 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 292 p+=i; 293 294 i= p- &(buf[2]); 295 buf[0]=((i>>8)&0xff)|0x80; 296 buf[1]=(i&0xff); 297 298 s->state=SSL23_ST_CW_CLNT_HELLO_B; 299 /* number of bytes to write */ 300 s->init_num=i+2; 301 s->init_off=0; 302 303 ssl3_finish_mac(s,&(buf[2]),i); 304 } 305 306 /* SSL3_ST_CW_CLNT_HELLO_B */ 307 return(ssl23_write_bytes(s)); 308 } 309 310static int ssl23_get_server_hello(SSL *s) 311 { 312 char buf[8]; 313 unsigned char *p; 314 int i; 315 int n; 316 317 n=ssl23_read_bytes(s,7); 318 319 if (n != 7) return(n); 320 p=s->packet; 321 322 memcpy(buf,p,n); 323 324 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 325 (p[5] == 0x00) && (p[6] == 0x02)) 326 { 327#ifdef NO_SSL2 328 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 329 goto err; 330#else 331 /* we are talking sslv2 */ 332 /* we need to clean up the SSLv3 setup and put in the 333 * sslv2 stuff. */ 334 int ch_len; 335 336 if (s->options & SSL_OP_NO_SSLv2) 337 { 338 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 339 goto err; 340 } 341 if (s->s2 == NULL) 342 { 343 if (!ssl2_new(s)) 344 goto err; 345 } 346 else 347 ssl2_clear(s); 348 349 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 350 ch_len=SSL2_CHALLENGE_LENGTH; 351 else 352 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 353 354 /* write out sslv2 challenge */ 355 i=(SSL3_RANDOM_SIZE < ch_len) 356 ?SSL3_RANDOM_SIZE:ch_len; 357 s->s2->challenge_length=i; 358 memcpy(s->s2->challenge, 359 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 360 361 if (s->s3 != NULL) ssl3_free(s); 362 363 if (!BUF_MEM_grow(s->init_buf, 364 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 365 { 366 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); 367 goto err; 368 } 369 370 s->state=SSL2_ST_GET_SERVER_HELLO_A; 371 if (!(s->client_version == SSL2_VERSION)) 372 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ 373 s->s2->ssl2_rollback=1; 374 375 /* setup the 5 bytes we have read so we get them from 376 * the sslv2 buffer */ 377 s->rstate=SSL_ST_READ_HEADER; 378 s->packet_length=n; 379 s->packet= &(s->s2->rbuf[0]); 380 memcpy(s->packet,buf,n); 381 s->s2->rbuf_left=n; 382 s->s2->rbuf_offs=0; 383 384 /* we have already written one */ 385 s->s2->write_sequence=1; 386 387 s->method=SSLv2_client_method(); 388 s->handshake_func=s->method->ssl_connect; 389#endif 390 } 391 else if ((p[0] == SSL3_RT_HANDSHAKE) && 392 (p[1] == SSL3_VERSION_MAJOR) && 393 ((p[2] == SSL3_VERSION_MINOR) || 394 (p[2] == TLS1_VERSION_MINOR)) && 395 (p[5] == SSL3_MT_SERVER_HELLO)) 396 { 397 /* we have sslv3 or tls1 */ 398 399 if (!ssl_init_wbio_buffer(s,1)) goto err; 400 401 /* we are in this state */ 402 s->state=SSL3_ST_CR_SRVR_HELLO_A; 403 404 /* put the 5 bytes we have read into the input buffer 405 * for SSLv3 */ 406 s->rstate=SSL_ST_READ_HEADER; 407 s->packet_length=n; 408 s->packet= &(s->s3->rbuf.buf[0]); 409 memcpy(s->packet,buf,n); 410 s->s3->rbuf.left=n; 411 s->s3->rbuf.offset=0; 412 413 if ((p[2] == SSL3_VERSION_MINOR) && 414 !(s->options & SSL_OP_NO_SSLv3)) 415 { 416 s->version=SSL3_VERSION; 417 s->method=SSLv3_client_method(); 418 } 419 else if ((p[2] == TLS1_VERSION_MINOR) && 420 !(s->options & SSL_OP_NO_TLSv1)) 421 { 422 s->version=TLS1_VERSION; 423 s->method=TLSv1_client_method(); 424 } 425 else 426 { 427 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 428 goto err; 429 } 430 431 s->handshake_func=s->method->ssl_connect; 432 } 433 else if ((p[0] == SSL3_RT_ALERT) && 434 (p[1] == SSL3_VERSION_MAJOR) && 435 ((p[2] == SSL3_VERSION_MINOR) || 436 (p[2] == TLS1_VERSION_MINOR)) && 437 (p[3] == 0) && 438 (p[4] == 2)) 439 { 440 void (*cb)()=NULL; 441 int j; 442 443 /* An alert */ 444 if (s->info_callback != NULL) 445 cb=s->info_callback; 446 else if (s->ctx->info_callback != NULL) 447 cb=s->ctx->info_callback; 448 449 i=p[5]; 450 if (cb != NULL) 451 { 452 j=(i<<8)|p[6]; 453 cb(s,SSL_CB_READ_ALERT,j); 454 } 455 456 s->rwstate=SSL_NOTHING; 457 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); 458 goto err; 459 } 460 else 461 { 462 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); 463 goto err; 464 } 465 s->init_num=0; 466 467 /* Since, if we are sending a ssl23 client hello, we are not 468 * reusing a session-id */ 469 if (!ssl_get_new_session(s,0)) 470 goto err; 471 472 s->first_packet=1; 473 return(SSL_connect(s)); 474err: 475 return(-1); 476 } 477 478