1 /* ssl/s2_clnt.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core (at) openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay (at) cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh (at) cryptsoft.com). 109 * 110 */ 111 112 #include "ssl_locl.h" 113 #ifndef OPENSSL_NO_SSL2 114 #include <stdio.h> 115 #include <openssl/rand.h> 116 #include <openssl/buffer.h> 117 #include <openssl/objects.h> 118 #include <openssl/evp.h> 119 120 static const SSL_METHOD *ssl2_get_client_method(int ver); 121 static int get_server_finished(SSL *s); 122 static int get_server_verify(SSL *s); 123 static int get_server_hello(SSL *s); 124 static int client_hello(SSL *s); 125 static int client_master_key(SSL *s); 126 static int client_finished(SSL *s); 127 static int client_certificate(SSL *s); 128 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from, 129 unsigned char *to,int padding); 130 #define BREAK break 131 132 static const SSL_METHOD *ssl2_get_client_method(int ver) 133 { 134 if (ver == SSL2_VERSION) 135 return(SSLv2_client_method()); 136 else 137 return(NULL); 138 } 139 140 IMPLEMENT_ssl2_meth_func(SSLv2_client_method, 141 ssl_undefined_function, 142 ssl2_connect, 143 ssl2_get_client_method) 144 145 int ssl2_connect(SSL *s) 146 { 147 unsigned long l=(unsigned long)time(NULL); 148 BUF_MEM *buf=NULL; 149 int ret= -1; 150 void (*cb)(const SSL *ssl,int type,int val)=NULL; 151 int new_state,state; 152 153 RAND_add(&l,sizeof(l),0); 154 ERR_clear_error(); 155 clear_sys_error(); 156 157 if (s->info_callback != NULL) 158 cb=s->info_callback; 159 else if (s->ctx->info_callback != NULL) 160 cb=s->ctx->info_callback; 161 162 /* init things to blank */ 163 s->in_handshake++; 164 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 165 166 for (;;) 167 { 168 state=s->state; 169 170 switch (s->state) 171 { 172 case SSL_ST_BEFORE: 173 case SSL_ST_CONNECT: 174 case SSL_ST_BEFORE|SSL_ST_CONNECT: 175 case SSL_ST_OK|SSL_ST_CONNECT: 176 177 s->server=0; 178 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 179 180 s->version=SSL2_VERSION; 181 s->type=SSL_ST_CONNECT; 182 183 buf=s->init_buf; 184 if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL)) 185 { 186 ret= -1; 187 goto end; 188 } 189 if (!BUF_MEM_grow(buf, 190 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 191 { 192 if (buf == s->init_buf) 193 buf=NULL; 194 ret= -1; 195 goto end; 196 } 197 s->init_buf=buf; 198 buf=NULL; 199 s->init_num=0; 200 s->state=SSL2_ST_SEND_CLIENT_HELLO_A; 201 s->ctx->stats.sess_connect++; 202 s->handshake_func=ssl2_connect; 203 BREAK; 204 205 case SSL2_ST_SEND_CLIENT_HELLO_A: 206 case SSL2_ST_SEND_CLIENT_HELLO_B: 207 s->shutdown=0; 208 ret=client_hello(s); 209 if (ret <= 0) goto end; 210 s->init_num=0; 211 s->state=SSL2_ST_GET_SERVER_HELLO_A; 212 BREAK; 213 214 case SSL2_ST_GET_SERVER_HELLO_A: 215 case SSL2_ST_GET_SERVER_HELLO_B: 216 ret=get_server_hello(s); 217 if (ret <= 0) goto end; 218 s->init_num=0; 219 if (!s->hit) /* new session */ 220 { 221 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A; 222 BREAK; 223 } 224 else 225 { 226 s->state=SSL2_ST_CLIENT_START_ENCRYPTION; 227 break; 228 } 229 230 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A: 231 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B: 232 ret=client_master_key(s); 233 if (ret <= 0) goto end; 234 s->init_num=0; 235 s->state=SSL2_ST_CLIENT_START_ENCRYPTION; 236 break; 237 238 case SSL2_ST_CLIENT_START_ENCRYPTION: 239 /* Ok, we now have all the stuff needed to 240 * start encrypting, so lets fire it up :-) */ 241 if (!ssl2_enc_init(s,1)) 242 { 243 ret= -1; 244 goto end; 245 } 246 s->s2->clear_text=0; 247 s->state=SSL2_ST_SEND_CLIENT_FINISHED_A; 248 break; 249 250 case SSL2_ST_SEND_CLIENT_FINISHED_A: 251 case SSL2_ST_SEND_CLIENT_FINISHED_B: 252 ret=client_finished(s); 253 if (ret <= 0) goto end; 254 s->init_num=0; 255 s->state=SSL2_ST_GET_SERVER_VERIFY_A; 256 break; 257 258 case SSL2_ST_GET_SERVER_VERIFY_A: 259 case SSL2_ST_GET_SERVER_VERIFY_B: 260 ret=get_server_verify(s); 261 if (ret <= 0) goto end; 262 s->init_num=0; 263 s->state=SSL2_ST_GET_SERVER_FINISHED_A; 264 break; 265 266 case SSL2_ST_GET_SERVER_FINISHED_A: 267 case SSL2_ST_GET_SERVER_FINISHED_B: 268 ret=get_server_finished(s); 269 if (ret <= 0) goto end; 270 break; 271 272 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A: 273 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B: 274 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C: 275 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D: 276 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE: 277 ret=client_certificate(s); 278 if (ret <= 0) goto end; 279 s->init_num=0; 280 s->state=SSL2_ST_GET_SERVER_FINISHED_A; 281 break; 282 283 case SSL_ST_OK: 284 if (s->init_buf != NULL) 285 { 286 BUF_MEM_free(s->init_buf); 287 s->init_buf=NULL; 288 } 289 s->init_num=0; 290 /* ERR_clear_error();*/ 291 292 /* If we want to cache session-ids in the client 293 * and we successfully add the session-id to the 294 * cache, and there is a callback, then pass it out. 295 * 26/11/96 - eay - only add if not a re-used session. 296 */ 297 298 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 299 if (s->hit) s->ctx->stats.sess_hit++; 300 301 ret=1; 302 /* s->server=0; */ 303 s->ctx->stats.sess_connect_good++; 304 305 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 306 307 goto end; 308 /* break; */ 309 default: 310 SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE); 311 return(-1); 312 /* break; */ 313 } 314 315 if ((cb != NULL) && (s->state != state)) 316 { 317 new_state=s->state; 318 s->state=state; 319 cb(s,SSL_CB_CONNECT_LOOP,1); 320 s->state=new_state; 321 } 322 } 323 end: 324 s->in_handshake--; 325 if (buf != NULL) 326 BUF_MEM_free(buf); 327 if (cb != NULL) 328 cb(s,SSL_CB_CONNECT_EXIT,ret); 329 return(ret); 330 } 331 332 static int get_server_hello(SSL *s) 333 { 334 unsigned char *buf; 335 unsigned char *p; 336 int i,j; 337 unsigned long len; 338 STACK_OF(SSL_CIPHER) *sk=NULL,*cl, *prio, *allow; 339 340 buf=(unsigned char *)s->init_buf->data; 341 p=buf; 342 if (s->state == SSL2_ST_GET_SERVER_HELLO_A) 343 { 344 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num); 345 if (i < (11-s->init_num)) 346 return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i)); 347 s->init_num = 11; 348 349 if (*(p++) != SSL2_MT_SERVER_HELLO) 350 { 351 if (p[-1] != SSL2_MT_ERROR) 352 { 353 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 354 SSLerr(SSL_F_GET_SERVER_HELLO, 355 SSL_R_READ_WRONG_PACKET_TYPE); 356 } 357 else 358 SSLerr(SSL_F_GET_SERVER_HELLO, 359 SSL_R_PEER_ERROR); 360 return(-1); 361 } 362 #if 0 363 s->hit=(*(p++))?1:0; 364 /* Some [PPC?] compilers fail to increment p in above 365 statement, e.g. one provided with Rhapsody 5.5, but 366 most recent example XL C 11.1 for AIX, even without 367 optimization flag... */ 368 #else 369 s->hit=(*p)?1:0; p++; 370 #endif 371 s->s2->tmp.cert_type= *(p++); 372 n2s(p,i); 373 if (i < s->version) s->version=i; 374 n2s(p,i); s->s2->tmp.cert_length=i; 375 n2s(p,i); s->s2->tmp.csl=i; 376 n2s(p,i); s->s2->tmp.conn_id_length=i; 377 s->state=SSL2_ST_GET_SERVER_HELLO_B; 378 } 379 380 /* SSL2_ST_GET_SERVER_HELLO_B */ 381 len = 11 + (unsigned long)s->s2->tmp.cert_length + (unsigned long)s->s2->tmp.csl + (unsigned long)s->s2->tmp.conn_id_length; 382 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 383 { 384 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_MESSAGE_TOO_LONG); 385 return -1; 386 } 387 j = (int)len - s->init_num; 388 i = ssl2_read(s,(char *)&(buf[s->init_num]),j); 389 if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i)); 390 if (s->msg_callback) 391 s->msg_callback(0, s->version, 0, buf, (size_t)len, s, s->msg_callback_arg); /* SERVER-HELLO */ 392 393 /* things are looking good */ 394 395 p = buf + 11; 396 if (s->hit) 397 { 398 if (s->s2->tmp.cert_length != 0) 399 { 400 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO); 401 return(-1); 402 } 403 if (s->s2->tmp.cert_type != 0) 404 { 405 if (!(s->options & 406 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG)) 407 { 408 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO); 409 return(-1); 410 } 411 } 412 if (s->s2->tmp.csl != 0) 413 { 414 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO); 415 return(-1); 416 } 417 } 418 else 419 { 420 #ifdef undef 421 /* very bad */ 422 memset(s->session->session_id,0, 423 SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES); 424 s->session->session_id_length=0; 425 */ 426 #endif 427 428 /* we need to do this in case we were trying to reuse a 429 * client session but others are already reusing it. 430 * If this was a new 'blank' session ID, the session-id 431 * length will still be 0 */ 432 if (s->session->session_id_length > 0) 433 { 434 if (!ssl_get_new_session(s,0)) 435 { 436 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 437 return(-1); 438 } 439 } 440 441 if (ssl2_set_certificate(s,s->s2->tmp.cert_type, 442 s->s2->tmp.cert_length,p) <= 0) 443 { 444 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE); 445 return(-1); 446 } 447 p+=s->s2->tmp.cert_length; 448 449 if (s->s2->tmp.csl == 0) 450 { 451 ssl2_return_error(s,SSL2_PE_NO_CIPHER); 452 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST); 453 return(-1); 454 } 455 456 /* We have just received a list of ciphers back from the 457 * server. We need to get the ones that match, then select 458 * the one we want the most :-). */ 459 460 /* load the ciphers */ 461 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl, 462 &s->session->ciphers); 463 p+=s->s2->tmp.csl; 464 if (sk == NULL) 465 { 466 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 467 SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE); 468 return(-1); 469 } 470 471 (void)sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp); 472 473 /* get the array of ciphers we will accept */ 474 cl=SSL_get_ciphers(s); 475 (void)sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp); 476 477 /* 478 * If server preference flag set, choose the first 479 * (highest priority) cipher the server sends, otherwise 480 * client preference has priority. 481 */ 482 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) 483 { 484 prio = sk; 485 allow = cl; 486 } 487 else 488 { 489 prio = cl; 490 allow = sk; 491 } 492 /* In theory we could have ciphers sent back that we 493 * don't want to use but that does not matter since we 494 * will check against the list we originally sent and 495 * for performance reasons we should not bother to match 496 * the two lists up just to check. */ 497 for (i=0; i<sk_SSL_CIPHER_num(prio); i++) 498 { 499 if (sk_SSL_CIPHER_find(allow, 500 sk_SSL_CIPHER_value(prio,i)) >= 0) 501 break; 502 } 503 504 if (i >= sk_SSL_CIPHER_num(prio)) 505 { 506 ssl2_return_error(s,SSL2_PE_NO_CIPHER); 507 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH); 508 return(-1); 509 } 510 s->session->cipher=sk_SSL_CIPHER_value(prio,i); 511 512 513 if (s->session->peer != NULL) /* can't happen*/ 514 { 515 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 516 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 517 return(-1); 518 } 519 520 s->session->peer = s->session->sess_cert->peer_key->x509; 521 /* peer_key->x509 has been set by ssl2_set_certificate. */ 522 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509); 523 } 524 525 if (s->session->sess_cert == NULL 526 || s->session->peer != s->session->sess_cert->peer_key->x509) 527 /* can't happen */ 528 { 529 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 530 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 531 return(-1); 532 } 533 534 s->s2->conn_id_length=s->s2->tmp.conn_id_length; 535 if (s->s2->conn_id_length > sizeof s->s2->conn_id) 536 { 537 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 538 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_SSL2_CONNECTION_ID_TOO_LONG); 539 return -1; 540 } 541 memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length); 542 return(1); 543 } 544 545 static int client_hello(SSL *s) 546 { 547 unsigned char *buf; 548 unsigned char *p,*d; 549 /* CIPHER **cipher;*/ 550 int i,n,j; 551 552 buf=(unsigned char *)s->init_buf->data; 553 if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A) 554 { 555 if ((s->session == NULL) || 556 (s->session->ssl_version != s->version)) 557 { 558 if (!ssl_get_new_session(s,0)) 559 { 560 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 561 return(-1); 562 } 563 } 564 /* else use the pre-loaded session */ 565 566 p=buf; /* header */ 567 d=p+9; /* data section */ 568 *(p++)=SSL2_MT_CLIENT_HELLO; /* type */ 569 s2n(SSL2_VERSION,p); /* version */ 570 n=j=0; 571 572 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d,0); 573 d+=n; 574 575 if (n == 0) 576 { 577 SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 578 return(-1); 579 } 580 581 s2n(n,p); /* cipher spec num bytes */ 582 583 if ((s->session->session_id_length > 0) && 584 (s->session->session_id_length <= 585 SSL2_MAX_SSL_SESSION_ID_LENGTH)) 586 { 587 i=s->session->session_id_length; 588 s2n(i,p); /* session id length */ 589 memcpy(d,s->session->session_id,(unsigned int)i); 590 d+=i; 591 } 592 else 593 { 594 s2n(0,p); 595 } 596 597 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH; 598 s2n(SSL2_CHALLENGE_LENGTH,p); /* challenge length */ 599 /*challenge id data*/ 600 if (RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH) <= 0) 601 return -1; 602 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH); 603 d+=SSL2_CHALLENGE_LENGTH; 604 605 s->state=SSL2_ST_SEND_CLIENT_HELLO_B; 606 s->init_num=d-buf; 607 s->init_off=0; 608 } 609 /* SSL2_ST_SEND_CLIENT_HELLO_B */ 610 return(ssl2_do_write(s)); 611 } 612 613 static int client_master_key(SSL *s) 614 { 615 unsigned char *buf; 616 unsigned char *p,*d; 617 int clear,enc,karg,i; 618 SSL_SESSION *sess; 619 const EVP_CIPHER *c; 620 const EVP_MD *md; 621 622 buf=(unsigned char *)s->init_buf->data; 623 if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A) 624 { 625 626 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL)) 627 { 628 ssl2_return_error(s,SSL2_PE_NO_CIPHER); 629 SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); 630 return(-1); 631 } 632 sess=s->session; 633 p=buf; 634 d=p+10; 635 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */ 636 637 i=ssl_put_cipher_by_char(s,sess->cipher,p); 638 p+=i; 639 640 /* make key_arg data */ 641 i=EVP_CIPHER_iv_length(c); 642 sess->key_arg_length=i; 643 if (i > SSL_MAX_KEY_ARG_LENGTH) 644 { 645 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 646 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); 647 return -1; 648 } 649 if (i > 0) 650 if (RAND_pseudo_bytes(sess->key_arg,i) <= 0) 651 return -1; 652 653 /* make a master key */ 654 i=EVP_CIPHER_key_length(c); 655 sess->master_key_length=i; 656 if (i > 0) 657 { 658 if (i > (int)sizeof(sess->master_key)) 659 { 660 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 661 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); 662 return -1; 663 } 664 if (RAND_bytes(sess->master_key,i) <= 0) 665 { 666 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 667 return(-1); 668 } 669 } 670 671 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC) 672 enc=8; 673 else if (SSL_C_IS_EXPORT(sess->cipher)) 674 enc=5; 675 else 676 enc=i; 677 678 if ((int)i < enc) 679 { 680 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 681 SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR); 682 return(-1); 683 } 684 clear=i-enc; 685 s2n(clear,p); 686 memcpy(d,sess->master_key,(unsigned int)clear); 687 d+=clear; 688 689 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc, 690 &(sess->master_key[clear]),d, 691 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING); 692 if (enc <= 0) 693 { 694 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 695 SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR); 696 return(-1); 697 } 698 #ifdef PKCS1_CHECK 699 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++; 700 if (s->options & SSL_OP_PKCS1_CHECK_2) 701 sess->master_key[clear]++; 702 #endif 703 s2n(enc,p); 704 d+=enc; 705 karg=sess->key_arg_length; 706 s2n(karg,p); /* key arg size */ 707 if (karg > (int)sizeof(sess->key_arg)) 708 { 709 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 710 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); 711 return -1; 712 } 713 memcpy(d,sess->key_arg,(unsigned int)karg); 714 d+=karg; 715 716 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B; 717 s->init_num=d-buf; 718 s->init_off=0; 719 } 720 721 /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */ 722 return(ssl2_do_write(s)); 723 } 724 725 static int client_finished(SSL *s) 726 { 727 unsigned char *p; 728 729 if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A) 730 { 731 p=(unsigned char *)s->init_buf->data; 732 *(p++)=SSL2_MT_CLIENT_FINISHED; 733 if (s->s2->conn_id_length > sizeof s->s2->conn_id) 734 { 735 SSLerr(SSL_F_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR); 736 return -1; 737 } 738 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length); 739 740 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B; 741 s->init_num=s->s2->conn_id_length+1; 742 s->init_off=0; 743 } 744 return(ssl2_do_write(s)); 745 } 746 747 /* read the data and then respond */ 748 static int client_certificate(SSL *s) 749 { 750 unsigned char *buf; 751 unsigned char *p,*d; 752 int i; 753 unsigned int n; 754 int cert_ch_len; 755 unsigned char *cert_ch; 756 757 buf=(unsigned char *)s->init_buf->data; 758 759 /* We have a cert associated with the SSL, so attach it to 760 * the session if it does not have one */ 761 762 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A) 763 { 764 i=ssl2_read(s,(char *)&(buf[s->init_num]), 765 SSL2_MAX_CERT_CHALLENGE_LENGTH+2-s->init_num); 766 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+2-s->init_num)) 767 return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i)); 768 s->init_num += i; 769 if (s->msg_callback) 770 s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* REQUEST-CERTIFICATE */ 771 772 /* type=buf[0]; */ 773 /* type eq x509 */ 774 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) 775 { 776 ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE); 777 SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE); 778 return(-1); 779 } 780 781 if ((s->cert == NULL) || 782 (s->cert->key->x509 == NULL) || 783 (s->cert->key->privatekey == NULL)) 784 { 785 s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE; 786 } 787 else 788 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C; 789 } 790 791 cert_ch = buf + 2; 792 cert_ch_len = s->init_num - 2; 793 794 if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE) 795 { 796 X509 *x509=NULL; 797 EVP_PKEY *pkey=NULL; 798 799 /* If we get an error we need to 800 * ssl->rwstate=SSL_X509_LOOKUP; 801 * return(error); 802 * We should then be retried when things are ok and we 803 * can get a cert or not */ 804 805 i=0; 806 if (s->ctx->client_cert_cb != NULL) 807 { 808 i=s->ctx->client_cert_cb(s,&(x509),&(pkey)); 809 } 810 811 if (i < 0) 812 { 813 s->rwstate=SSL_X509_LOOKUP; 814 return(-1); 815 } 816 s->rwstate=SSL_NOTHING; 817 818 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 819 { 820 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C; 821 if ( !SSL_use_certificate(s,x509) || 822 !SSL_use_PrivateKey(s,pkey)) 823 { 824 i=0; 825 } 826 X509_free(x509); 827 EVP_PKEY_free(pkey); 828 } 829 else if (i == 1) 830 { 831 if (x509 != NULL) X509_free(x509); 832 if (pkey != NULL) EVP_PKEY_free(pkey); 833 SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 834 i=0; 835 } 836 837 if (i == 0) 838 { 839 /* We have no client certificate to respond with 840 * so send the correct error message back */ 841 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B; 842 p=buf; 843 *(p++)=SSL2_MT_ERROR; 844 s2n(SSL2_PE_NO_CERTIFICATE,p); 845 s->init_off=0; 846 s->init_num=3; 847 /* Write is done at the end */ 848 } 849 } 850 851 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B) 852 { 853 return(ssl2_do_write(s)); 854 } 855 856 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C) 857 { 858 EVP_MD_CTX ctx; 859 860 /* ok, now we calculate the checksum 861 * do it first so we can reuse buf :-) */ 862 p=buf; 863 EVP_MD_CTX_init(&ctx); 864 EVP_SignInit_ex(&ctx,s->ctx->rsa_md5, NULL); 865 EVP_SignUpdate(&ctx,s->s2->key_material, 866 s->s2->key_material_length); 867 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len); 868 i=i2d_X509(s->session->sess_cert->peer_key->x509,&p); 869 /* Don't update the signature if it fails - FIXME: probably should handle this better */ 870 if(i > 0) 871 EVP_SignUpdate(&ctx,buf,(unsigned int)i); 872 873 p=buf; 874 d=p+6; 875 *(p++)=SSL2_MT_CLIENT_CERTIFICATE; 876 *(p++)=SSL2_CT_X509_CERTIFICATE; 877 n=i2d_X509(s->cert->key->x509,&d); 878 s2n(n,p); 879 880 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey)) 881 { 882 /* this is not good. If things have failed it 883 * means there so something wrong with the key. 884 * We will continue with a 0 length signature 885 */ 886 } 887 EVP_MD_CTX_cleanup(&ctx); 888 s2n(n,p); 889 d+=n; 890 891 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D; 892 s->init_num=d-buf; 893 s->init_off=0; 894 } 895 /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */ 896 return(ssl2_do_write(s)); 897 } 898 899 static int get_server_verify(SSL *s) 900 { 901 unsigned char *p; 902 int i, n, len; 903 904 p=(unsigned char *)s->init_buf->data; 905 if (s->state == SSL2_ST_GET_SERVER_VERIFY_A) 906 { 907 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num); 908 if (i < (1-s->init_num)) 909 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i)); 910 s->init_num += i; 911 912 s->state= SSL2_ST_GET_SERVER_VERIFY_B; 913 if (*p != SSL2_MT_SERVER_VERIFY) 914 { 915 if (p[0] != SSL2_MT_ERROR) 916 { 917 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 918 SSLerr(SSL_F_GET_SERVER_VERIFY, 919 SSL_R_READ_WRONG_PACKET_TYPE); 920 } 921 else 922 { 923 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_PEER_ERROR); 924 /* try to read the error message */ 925 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num); 926 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i); 927 } 928 return(-1); 929 } 930 } 931 932 p=(unsigned char *)s->init_buf->data; 933 len = 1 + s->s2->challenge_length; 934 n = len - s->init_num; 935 i = ssl2_read(s,(char *)&(p[s->init_num]),n); 936 if (i < n) 937 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i)); 938 if (s->msg_callback) 939 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* SERVER-VERIFY */ 940 p += 1; 941 942 if (CRYPTO_memcmp(p,s->s2->challenge,s->s2->challenge_length) != 0) 943 { 944 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 945 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT); 946 return(-1); 947 } 948 return(1); 949 } 950 951 static int get_server_finished(SSL *s) 952 { 953 unsigned char *buf; 954 unsigned char *p; 955 int i, n, len; 956 957 buf=(unsigned char *)s->init_buf->data; 958 p=buf; 959 if (s->state == SSL2_ST_GET_SERVER_FINISHED_A) 960 { 961 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num); 962 if (i < (1-s->init_num)) 963 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i)); 964 s->init_num += i; 965 966 if (*p == SSL2_MT_REQUEST_CERTIFICATE) 967 { 968 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A; 969 return(1); 970 } 971 else if (*p != SSL2_MT_SERVER_FINISHED) 972 { 973 if (p[0] != SSL2_MT_ERROR) 974 { 975 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 976 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE); 977 } 978 else 979 { 980 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR); 981 /* try to read the error message */ 982 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num); 983 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i); 984 } 985 return(-1); 986 } 987 s->state=SSL2_ST_GET_SERVER_FINISHED_B; 988 } 989 990 len = 1 + SSL2_SSL_SESSION_ID_LENGTH; 991 n = len - s->init_num; 992 i = ssl2_read(s,(char *)&(buf[s->init_num]), n); 993 if (i < n) /* XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, that's the maximum */ 994 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i)); 995 s->init_num += i; 996 if (s->msg_callback) 997 s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* SERVER-FINISHED */ 998 999 if (!s->hit) /* new session */ 1000 { 1001 /* new session-id */ 1002 /* Make sure we were not trying to re-use an old SSL_SESSION 1003 * or bad things can happen */ 1004 /* ZZZZZZZZZZZZZ */ 1005 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH; 1006 memcpy(s->session->session_id,p+1,SSL2_SSL_SESSION_ID_LENGTH); 1007 } 1008 else 1009 { 1010 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG)) 1011 { 1012 if ((s->session->session_id_length > sizeof s->session->session_id) 1013 || (0 != memcmp(buf + 1, s->session->session_id, 1014 (unsigned int)s->session->session_id_length))) 1015 { 1016 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 1017 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT); 1018 return(-1); 1019 } 1020 } 1021 } 1022 s->state = SSL_ST_OK; 1023 return(1); 1024 } 1025 1026 /* loads in the certificate from the server */ 1027 int ssl2_set_certificate(SSL *s, int type, int len, const unsigned char *data) 1028 { 1029 STACK_OF(X509) *sk=NULL; 1030 EVP_PKEY *pkey=NULL; 1031 SESS_CERT *sc=NULL; 1032 int i; 1033 X509 *x509=NULL; 1034 int ret=0; 1035 1036 x509=d2i_X509(NULL,&data,(long)len); 1037 if (x509 == NULL) 1038 { 1039 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB); 1040 goto err; 1041 } 1042 1043 if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509)) 1044 { 1045 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE); 1046 goto err; 1047 } 1048 1049 i=ssl_verify_cert_chain(s,sk); 1050 1051 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) 1052 { 1053 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED); 1054 goto err; 1055 } 1056 ERR_clear_error(); /* but we keep s->verify_result */ 1057 s->session->verify_result = s->verify_result; 1058 1059 /* server's cert for this session */ 1060 sc=ssl_sess_cert_new(); 1061 if (sc == NULL) 1062 { 1063 ret= -1; 1064 goto err; 1065 } 1066 if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert); 1067 s->session->sess_cert=sc; 1068 1069 sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509; 1070 sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]); 1071 1072 pkey=X509_get_pubkey(x509); 1073 x509=NULL; 1074 if (pkey == NULL) 1075 { 1076 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY); 1077 goto err; 1078 } 1079 if (pkey->type != EVP_PKEY_RSA) 1080 { 1081 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA); 1082 goto err; 1083 } 1084 1085 if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE)) 1086 goto err; 1087 ret=1; 1088 err: 1089 sk_X509_free(sk); 1090 X509_free(x509); 1091 EVP_PKEY_free(pkey); 1092 return(ret); 1093 } 1094 1095 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from, 1096 unsigned char *to, int padding) 1097 { 1098 EVP_PKEY *pkey=NULL; 1099 int i= -1; 1100 1101 if ((sc == NULL) || (sc->peer_key->x509 == NULL) || 1102 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL)) 1103 { 1104 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY); 1105 return(-1); 1106 } 1107 if (pkey->type != EVP_PKEY_RSA) 1108 { 1109 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA); 1110 goto end; 1111 } 1112 1113 /* we have the public key */ 1114 i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding); 1115 if (i < 0) 1116 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB); 1117 end: 1118 EVP_PKEY_free(pkey); 1119 return(i); 1120 } 1121 #else /* !OPENSSL_NO_SSL2 */ 1122 1123 # if PEDANTIC 1124 static void *dummy=&dummy; 1125 # endif 1126 1127 #endif 1128
