s2_srvr.c revision 279264
1/* ssl/s2_srvr.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 * 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@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@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 112#include "ssl_locl.h" 113#ifndef OPENSSL_NO_SSL2 114#include <stdio.h> 115#include <openssl/bio.h> 116#include <openssl/rand.h> 117#include <openssl/objects.h> 118#include <openssl/evp.h> 119 120static const SSL_METHOD *ssl2_get_server_method(int ver); 121static int get_client_master_key(SSL *s); 122static int get_client_hello(SSL *s); 123static int server_hello(SSL *s); 124static int get_client_finished(SSL *s); 125static int server_verify(SSL *s); 126static int server_finish(SSL *s); 127static int request_certificate(SSL *s); 128static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from, 129 unsigned char *to,int padding); 130#define BREAK break 131 132static const SSL_METHOD *ssl2_get_server_method(int ver) 133 { 134 if (ver == SSL2_VERSION) 135 return(SSLv2_server_method()); 136 else 137 return(NULL); 138 } 139 140IMPLEMENT_ssl2_meth_func(SSLv2_server_method, 141 ssl2_accept, 142 ssl_undefined_function, 143 ssl2_get_server_method) 144 145int ssl2_accept(SSL *s) 146 { 147 unsigned long l=(unsigned long)time(NULL); 148 BUF_MEM *buf=NULL; 149 int ret= -1; 150 long num1; 151 void (*cb)(const SSL *ssl,int type,int val)=NULL; 152 int new_state,state; 153 154 RAND_add(&l,sizeof(l),0); 155 ERR_clear_error(); 156 clear_sys_error(); 157 158 if (s->info_callback != NULL) 159 cb=s->info_callback; 160 else if (s->ctx->info_callback != NULL) 161 cb=s->ctx->info_callback; 162 163 /* init things to blank */ 164 s->in_handshake++; 165 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 166 167 if (s->cert == NULL) 168 { 169 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET); 170 return(-1); 171 } 172 173 clear_sys_error(); 174 for (;;) 175 { 176 state=s->state; 177 178 switch (s->state) 179 { 180 case SSL_ST_BEFORE: 181 case SSL_ST_ACCEPT: 182 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 183 case SSL_ST_OK|SSL_ST_ACCEPT: 184 185 s->server=1; 186 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 187 188 s->version=SSL2_VERSION; 189 s->type=SSL_ST_ACCEPT; 190 191 if(s->init_buf == NULL) 192 { 193 if ((buf=BUF_MEM_new()) == NULL) 194 { 195 ret= -1; 196 goto end; 197 } 198 if (!BUF_MEM_grow(buf,(int) SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 199 { 200 BUF_MEM_free(buf); 201 ret= -1; 202 goto end; 203 } 204 s->init_buf=buf; 205 } 206 s->init_num=0; 207 s->ctx->stats.sess_accept++; 208 s->handshake_func=ssl2_accept; 209 s->state=SSL2_ST_GET_CLIENT_HELLO_A; 210 BREAK; 211 212 case SSL2_ST_GET_CLIENT_HELLO_A: 213 case SSL2_ST_GET_CLIENT_HELLO_B: 214 case SSL2_ST_GET_CLIENT_HELLO_C: 215 s->shutdown=0; 216 ret=get_client_hello(s); 217 if (ret <= 0) goto end; 218 s->init_num=0; 219 s->state=SSL2_ST_SEND_SERVER_HELLO_A; 220 BREAK; 221 222 case SSL2_ST_SEND_SERVER_HELLO_A: 223 case SSL2_ST_SEND_SERVER_HELLO_B: 224 ret=server_hello(s); 225 if (ret <= 0) goto end; 226 s->init_num=0; 227 if (!s->hit) 228 { 229 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A; 230 BREAK; 231 } 232 else 233 { 234 s->state=SSL2_ST_SERVER_START_ENCRYPTION; 235 BREAK; 236 } 237 case SSL2_ST_GET_CLIENT_MASTER_KEY_A: 238 case SSL2_ST_GET_CLIENT_MASTER_KEY_B: 239 ret=get_client_master_key(s); 240 if (ret <= 0) goto end; 241 s->init_num=0; 242 s->state=SSL2_ST_SERVER_START_ENCRYPTION; 243 BREAK; 244 245 case SSL2_ST_SERVER_START_ENCRYPTION: 246 /* Ok we how have sent all the stuff needed to 247 * start encrypting, the next packet back will 248 * be encrypted. */ 249 if (!ssl2_enc_init(s,0)) 250 { ret= -1; goto end; } 251 s->s2->clear_text=0; 252 s->state=SSL2_ST_SEND_SERVER_VERIFY_A; 253 BREAK; 254 255 case SSL2_ST_SEND_SERVER_VERIFY_A: 256 case SSL2_ST_SEND_SERVER_VERIFY_B: 257 ret=server_verify(s); 258 if (ret <= 0) goto end; 259 s->init_num=0; 260 if (s->hit) 261 { 262 /* If we are in here, we have been 263 * buffering the output, so we need to 264 * flush it and remove buffering from 265 * future traffic */ 266 s->state=SSL2_ST_SEND_SERVER_VERIFY_C; 267 BREAK; 268 } 269 else 270 { 271 s->state=SSL2_ST_GET_CLIENT_FINISHED_A; 272 break; 273 } 274 275 case SSL2_ST_SEND_SERVER_VERIFY_C: 276 /* get the number of bytes to write */ 277 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL); 278 if (num1 > 0) 279 { 280 s->rwstate=SSL_WRITING; 281 num1=BIO_flush(s->wbio); 282 if (num1 <= 0) { ret= -1; goto end; } 283 s->rwstate=SSL_NOTHING; 284 } 285 286 /* flushed and now remove buffering */ 287 s->wbio=BIO_pop(s->wbio); 288 289 s->state=SSL2_ST_GET_CLIENT_FINISHED_A; 290 BREAK; 291 292 case SSL2_ST_GET_CLIENT_FINISHED_A: 293 case SSL2_ST_GET_CLIENT_FINISHED_B: 294 ret=get_client_finished(s); 295 if (ret <= 0) 296 goto end; 297 s->init_num=0; 298 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A; 299 BREAK; 300 301 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A: 302 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B: 303 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C: 304 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D: 305 /* don't do a 'request certificate' if we 306 * don't want to, or we already have one, and 307 * we only want to do it once. */ 308 if (!(s->verify_mode & SSL_VERIFY_PEER) || 309 ((s->session->peer != NULL) && 310 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE))) 311 { 312 s->state=SSL2_ST_SEND_SERVER_FINISHED_A; 313 break; 314 } 315 else 316 { 317 ret=request_certificate(s); 318 if (ret <= 0) goto end; 319 s->init_num=0; 320 s->state=SSL2_ST_SEND_SERVER_FINISHED_A; 321 } 322 BREAK; 323 324 case SSL2_ST_SEND_SERVER_FINISHED_A: 325 case SSL2_ST_SEND_SERVER_FINISHED_B: 326 ret=server_finish(s); 327 if (ret <= 0) goto end; 328 s->init_num=0; 329 s->state=SSL_ST_OK; 330 break; 331 332 case SSL_ST_OK: 333 BUF_MEM_free(s->init_buf); 334 ssl_free_wbio_buffer(s); 335 s->init_buf=NULL; 336 s->init_num=0; 337 /* ERR_clear_error();*/ 338 339 ssl_update_cache(s,SSL_SESS_CACHE_SERVER); 340 341 s->ctx->stats.sess_accept_good++; 342 /* s->server=1; */ 343 ret=1; 344 345 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 346 347 goto end; 348 /* BREAK; */ 349 350 default: 351 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE); 352 ret= -1; 353 goto end; 354 /* BREAK; */ 355 } 356 357 if ((cb != NULL) && (s->state != state)) 358 { 359 new_state=s->state; 360 s->state=state; 361 cb(s,SSL_CB_ACCEPT_LOOP,1); 362 s->state=new_state; 363 } 364 } 365end: 366 s->in_handshake--; 367 if (cb != NULL) 368 cb(s,SSL_CB_ACCEPT_EXIT,ret); 369 return(ret); 370 } 371 372static int get_client_master_key(SSL *s) 373 { 374 int is_export,i,n,keya,ek; 375 unsigned long len; 376 unsigned char *p; 377 const SSL_CIPHER *cp; 378 const EVP_CIPHER *c; 379 const EVP_MD *md; 380 381 p=(unsigned char *)s->init_buf->data; 382 if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A) 383 { 384 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num); 385 386 if (i < (10-s->init_num)) 387 return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i)); 388 s->init_num = 10; 389 390 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY) 391 { 392 if (p[-1] != SSL2_MT_ERROR) 393 { 394 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 395 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE); 396 } 397 else 398 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR); 399 return(-1); 400 } 401 402 cp=ssl2_get_cipher_by_char(p); 403 if (cp == NULL) 404 { 405 ssl2_return_error(s,SSL2_PE_NO_CIPHER); 406 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH); 407 return(-1); 408 } 409 s->session->cipher= cp; 410 411 p+=3; 412 n2s(p,i); s->s2->tmp.clear=i; 413 n2s(p,i); s->s2->tmp.enc=i; 414 n2s(p,i); 415 if(i > SSL_MAX_KEY_ARG_LENGTH) 416 { 417 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 418 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG); 419 return -1; 420 } 421 s->session->key_arg_length=i; 422 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B; 423 } 424 425 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */ 426 p=(unsigned char *)s->init_buf->data; 427 if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 428 { 429 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 430 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); 431 return -1; 432 } 433 keya=s->session->key_arg_length; 434 len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya; 435 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 436 { 437 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 438 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG); 439 return -1; 440 } 441 n = (int)len - s->init_num; 442 i = ssl2_read(s,(char *)&(p[s->init_num]),n); 443 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i)); 444 if (s->msg_callback) 445 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */ 446 p += 10; 447 448 memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]), 449 (unsigned int)keya); 450 451 if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL) 452 { 453 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 454 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY); 455 return(-1); 456 } 457 i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc, 458 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]), 459 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING); 460 461 is_export=SSL_C_IS_EXPORT(s->session->cipher); 462 463 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL)) 464 { 465 ssl2_return_error(s,SSL2_PE_NO_CIPHER); 466 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); 467 return(0); 468 } 469 470 if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC) 471 { 472 is_export=1; 473 ek=8; 474 } 475 else 476 ek=5; 477 478 /* bad decrypt */ 479#if 1 480 /* If a bad decrypt, continue with protocol but with a 481 * random master secret (Bleichenbacher attack) */ 482 if ((i < 0) || 483 ((!is_export && (i != EVP_CIPHER_key_length(c))) 484 || (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i != 485 (unsigned int)EVP_CIPHER_key_length(c)))))) 486 { 487 ERR_clear_error(); 488 if (is_export) 489 i=ek; 490 else 491 i=EVP_CIPHER_key_length(c); 492 if (RAND_pseudo_bytes(p,i) <= 0) 493 return 0; 494 } 495#else 496 if (i < 0) 497 { 498 error=1; 499 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT); 500 } 501 /* incorrect number of key bytes for non export cipher */ 502 else if ((!is_export && (i != EVP_CIPHER_key_length(c))) 503 || (is_export && ((i != ek) || (s->s2->tmp.clear+i != 504 EVP_CIPHER_key_length(c))))) 505 { 506 error=1; 507 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS); 508 } 509 if (error) 510 { 511 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 512 return(-1); 513 } 514#endif 515 516 if (is_export) i+=s->s2->tmp.clear; 517 518 if (i > SSL_MAX_MASTER_KEY_LENGTH) 519 { 520 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 521 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); 522 return -1; 523 } 524 s->session->master_key_length=i; 525 memcpy(s->session->master_key,p,(unsigned int)i); 526 return(1); 527 } 528 529static int get_client_hello(SSL *s) 530 { 531 int i,n; 532 unsigned long len; 533 unsigned char *p; 534 STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */ 535 STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */ 536 STACK_OF(SSL_CIPHER) *prio, *allow; 537 int z; 538 539 /* This is a bit of a hack to check for the correct packet 540 * type the first time round. */ 541 if (s->state == SSL2_ST_GET_CLIENT_HELLO_A) 542 { 543 s->first_packet=1; 544 s->state=SSL2_ST_GET_CLIENT_HELLO_B; 545 } 546 547 p=(unsigned char *)s->init_buf->data; 548 if (s->state == SSL2_ST_GET_CLIENT_HELLO_B) 549 { 550 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num); 551 if (i < (9-s->init_num)) 552 return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i)); 553 s->init_num = 9; 554 555 if (*(p++) != SSL2_MT_CLIENT_HELLO) 556 { 557 if (p[-1] != SSL2_MT_ERROR) 558 { 559 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 560 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE); 561 } 562 else 563 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR); 564 return(-1); 565 } 566 n2s(p,i); 567 if (i < s->version) s->version=i; 568 n2s(p,i); s->s2->tmp.cipher_spec_length=i; 569 n2s(p,i); s->s2->tmp.session_id_length=i; 570 n2s(p,i); s->s2->challenge_length=i; 571 if ( (i < SSL2_MIN_CHALLENGE_LENGTH) || 572 (i > SSL2_MAX_CHALLENGE_LENGTH)) 573 { 574 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 575 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH); 576 return(-1); 577 } 578 s->state=SSL2_ST_GET_CLIENT_HELLO_C; 579 } 580 581 /* SSL2_ST_GET_CLIENT_HELLO_C */ 582 p=(unsigned char *)s->init_buf->data; 583 len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length; 584 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 585 { 586 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 587 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG); 588 return -1; 589 } 590 n = (int)len - s->init_num; 591 i = ssl2_read(s,(char *)&(p[s->init_num]),n); 592 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i)); 593 if (s->msg_callback) 594 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */ 595 p += 9; 596 597 /* get session-id before cipher stuff so we can get out session 598 * structure if it is cached */ 599 /* session-id */ 600 if ((s->s2->tmp.session_id_length != 0) && 601 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH)) 602 { 603 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 604 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH); 605 return(-1); 606 } 607 608 if (s->s2->tmp.session_id_length == 0) 609 { 610 if (!ssl_get_new_session(s,1)) 611 { 612 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 613 return(-1); 614 } 615 } 616 else 617 { 618 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]), 619 s->s2->tmp.session_id_length, NULL); 620 if (i == 1) 621 { /* previous session */ 622 s->hit=1; 623 } 624 else if (i == -1) 625 { 626 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 627 return(-1); 628 } 629 else 630 { 631 if (s->cert == NULL) 632 { 633 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE); 634 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET); 635 return(-1); 636 } 637 638 if (!ssl_get_new_session(s,1)) 639 { 640 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 641 return(-1); 642 } 643 } 644 } 645 646 if (!s->hit) 647 { 648 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length, 649 &s->session->ciphers); 650 if (cs == NULL) goto mem_err; 651 652 cl=SSL_get_ciphers(s); 653 654 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) 655 { 656 prio=sk_SSL_CIPHER_dup(cl); 657 if (prio == NULL) goto mem_err; 658 allow = cs; 659 } 660 else 661 { 662 prio = cs; 663 allow = cl; 664 } 665 for (z=0; z<sk_SSL_CIPHER_num(prio); z++) 666 { 667 if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0) 668 { 669 (void)sk_SSL_CIPHER_delete(prio,z); 670 z--; 671 } 672 } 673 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) 674 { 675 sk_SSL_CIPHER_free(s->session->ciphers); 676 s->session->ciphers = prio; 677 } 678 /* s->session->ciphers should now have a list of 679 * ciphers that are on both the client and server. 680 * This list is ordered by the order the client sent 681 * the ciphers or in the order of the server's preference 682 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set. 683 */ 684 } 685 p+=s->s2->tmp.cipher_spec_length; 686 /* done cipher selection */ 687 688 /* session id extracted already */ 689 p+=s->s2->tmp.session_id_length; 690 691 /* challenge */ 692 if (s->s2->challenge_length > sizeof s->s2->challenge) 693 { 694 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 695 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 696 return -1; 697 } 698 memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length); 699 return(1); 700mem_err: 701 SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE); 702 return(0); 703 } 704 705static int server_hello(SSL *s) 706 { 707 unsigned char *p,*d; 708 int n,hit; 709 710 p=(unsigned char *)s->init_buf->data; 711 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A) 712 { 713 d=p+11; 714 *(p++)=SSL2_MT_SERVER_HELLO; /* type */ 715 hit=s->hit; 716 *(p++)=(unsigned char)hit; 717#if 1 718 if (!hit) 719 { 720 if (s->session->sess_cert != NULL) 721 /* This can't really happen because get_client_hello 722 * has called ssl_get_new_session, which does not set 723 * sess_cert. */ 724 ssl_sess_cert_free(s->session->sess_cert); 725 s->session->sess_cert = ssl_sess_cert_new(); 726 if (s->session->sess_cert == NULL) 727 { 728 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE); 729 return(-1); 730 } 731 } 732 /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL, 733 * depending on whether it survived in the internal cache 734 * or was retrieved from an external cache. 735 * If it is NULL, we cannot put any useful data in it anyway, 736 * so we don't touch it. 737 */ 738 739#else /* That's what used to be done when cert_st and sess_cert_st were 740 * the same. */ 741 if (!hit) 742 { /* else add cert to session */ 743 CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT); 744 if (s->session->sess_cert != NULL) 745 ssl_cert_free(s->session->sess_cert); 746 s->session->sess_cert=s->cert; 747 } 748 else /* We have a session id-cache hit, if the 749 * session-id has no certificate listed against 750 * the 'cert' structure, grab the 'old' one 751 * listed against the SSL connection */ 752 { 753 if (s->session->sess_cert == NULL) 754 { 755 CRYPTO_add(&s->cert->references,1, 756 CRYPTO_LOCK_SSL_CERT); 757 s->session->sess_cert=s->cert; 758 } 759 } 760#endif 761 762 if (s->cert == NULL) 763 { 764 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE); 765 SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED); 766 return(-1); 767 } 768 769 if (hit) 770 { 771 *(p++)=0; /* no certificate type */ 772 s2n(s->version,p); /* version */ 773 s2n(0,p); /* cert len */ 774 s2n(0,p); /* ciphers len */ 775 } 776 else 777 { 778 /* EAY EAY */ 779 /* put certificate type */ 780 *(p++)=SSL2_CT_X509_CERTIFICATE; 781 s2n(s->version,p); /* version */ 782 n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL); 783 s2n(n,p); /* certificate length */ 784 i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d); 785 n=0; 786 787 /* lets send out the ciphers we like in the 788 * prefered order */ 789 n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0); 790 d+=n; 791 s2n(n,p); /* add cipher length */ 792 } 793 794 /* make and send conn_id */ 795 s2n(SSL2_CONNECTION_ID_LENGTH,p); /* add conn_id length */ 796 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH; 797 if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0) 798 return -1; 799 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH); 800 d+=SSL2_CONNECTION_ID_LENGTH; 801 802 s->state=SSL2_ST_SEND_SERVER_HELLO_B; 803 s->init_num=d-(unsigned char *)s->init_buf->data; 804 s->init_off=0; 805 } 806 /* SSL2_ST_SEND_SERVER_HELLO_B */ 807 /* If we are using TCP/IP, the performance is bad if we do 2 808 * writes without a read between them. This occurs when 809 * Session-id reuse is used, so I will put in a buffering module 810 */ 811 if (s->hit) 812 { 813 if (!ssl_init_wbio_buffer(s,1)) return(-1); 814 } 815 816 return(ssl2_do_write(s)); 817 } 818 819static int get_client_finished(SSL *s) 820 { 821 unsigned char *p; 822 int i, n; 823 unsigned long len; 824 825 p=(unsigned char *)s->init_buf->data; 826 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A) 827 { 828 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num); 829 if (i < 1-s->init_num) 830 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i)); 831 s->init_num += i; 832 833 if (*p != SSL2_MT_CLIENT_FINISHED) 834 { 835 if (*p != SSL2_MT_ERROR) 836 { 837 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 838 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE); 839 } 840 else 841 { 842 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR); 843 /* try to read the error message */ 844 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num); 845 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i); 846 } 847 return(-1); 848 } 849 s->state=SSL2_ST_GET_CLIENT_FINISHED_B; 850 } 851 852 /* SSL2_ST_GET_CLIENT_FINISHED_B */ 853 if (s->s2->conn_id_length > sizeof s->s2->conn_id) 854 { 855 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 856 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR); 857 return -1; 858 } 859 len = 1 + (unsigned long)s->s2->conn_id_length; 860 n = (int)len - s->init_num; 861 i = ssl2_read(s,(char *)&(p[s->init_num]),n); 862 if (i < n) 863 { 864 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i)); 865 } 866 if (s->msg_callback) 867 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */ 868 p += 1; 869 if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0) 870 { 871 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 872 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT); 873 return(-1); 874 } 875 return(1); 876 } 877 878static int server_verify(SSL *s) 879 { 880 unsigned char *p; 881 882 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A) 883 { 884 p=(unsigned char *)s->init_buf->data; 885 *(p++)=SSL2_MT_SERVER_VERIFY; 886 if (s->s2->challenge_length > sizeof s->s2->challenge) 887 { 888 SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR); 889 return -1; 890 } 891 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length); 892 /* p+=s->s2->challenge_length; */ 893 894 s->state=SSL2_ST_SEND_SERVER_VERIFY_B; 895 s->init_num=s->s2->challenge_length+1; 896 s->init_off=0; 897 } 898 return(ssl2_do_write(s)); 899 } 900 901static int server_finish(SSL *s) 902 { 903 unsigned char *p; 904 905 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A) 906 { 907 p=(unsigned char *)s->init_buf->data; 908 *(p++)=SSL2_MT_SERVER_FINISHED; 909 910 if (s->session->session_id_length > sizeof s->session->session_id) 911 { 912 SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR); 913 return -1; 914 } 915 memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length); 916 /* p+=s->session->session_id_length; */ 917 918 s->state=SSL2_ST_SEND_SERVER_FINISHED_B; 919 s->init_num=s->session->session_id_length+1; 920 s->init_off=0; 921 } 922 923 /* SSL2_ST_SEND_SERVER_FINISHED_B */ 924 return(ssl2_do_write(s)); 925 } 926 927/* send the request and check the response */ 928static int request_certificate(SSL *s) 929 { 930 const unsigned char *cp; 931 unsigned char *p,*p2,*buf2; 932 unsigned char *ccd; 933 int i,j,ctype,ret= -1; 934 unsigned long len; 935 X509 *x509=NULL; 936 STACK_OF(X509) *sk=NULL; 937 938 ccd=s->s2->tmp.ccl; 939 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A) 940 { 941 p=(unsigned char *)s->init_buf->data; 942 *(p++)=SSL2_MT_REQUEST_CERTIFICATE; 943 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION; 944 if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0) 945 return -1; 946 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH); 947 948 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B; 949 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2; 950 s->init_off=0; 951 } 952 953 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B) 954 { 955 i=ssl2_do_write(s); 956 if (i <= 0) 957 { 958 ret=i; 959 goto end; 960 } 961 962 s->init_num=0; 963 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C; 964 } 965 966 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C) 967 { 968 p=(unsigned char *)s->init_buf->data; 969 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */ 970 if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3 971 * (probably NO-CERTIFICATE-ERROR) */ 972 { 973 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i); 974 goto end; 975 } 976 s->init_num += i; 977 978 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR)) 979 { 980 n2s(p,i); 981 if (i != SSL2_PE_NO_CERTIFICATE) 982 { 983 /* not the error message we expected -- let ssl2_part_read handle it */ 984 s->init_num -= 3; 985 ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3); 986 goto end; 987 } 988 989 if (s->msg_callback) 990 s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */ 991 992 /* this is the one place where we can recover from an SSL 2.0 error */ 993 994 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) 995 { 996 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE); 997 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 998 goto end; 999 } 1000 ret=1; 1001 goto end; 1002 } 1003 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6)) 1004 { 1005 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 1006 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ); 1007 goto end; 1008 } 1009 if (s->init_num != 6) 1010 { 1011 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR); 1012 goto end; 1013 } 1014 1015 /* ok we have a response */ 1016 /* certificate type, there is only one right now. */ 1017 ctype= *(p++); 1018 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) 1019 { 1020 ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE); 1021 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT); 1022 goto end; 1023 } 1024 n2s(p,i); s->s2->tmp.clen=i; 1025 n2s(p,i); s->s2->tmp.rlen=i; 1026 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D; 1027 } 1028 1029 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */ 1030 p=(unsigned char *)s->init_buf->data; 1031 len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen; 1032 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 1033 { 1034 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG); 1035 goto end; 1036 } 1037 j = (int)len - s->init_num; 1038 i = ssl2_read(s,(char *)&(p[s->init_num]),j); 1039 if (i < j) 1040 { 1041 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i); 1042 goto end; 1043 } 1044 if (s->msg_callback) 1045 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */ 1046 p += 6; 1047 1048 cp = p; 1049 x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen); 1050 if (x509 == NULL) 1051 { 1052 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB); 1053 goto msg_end; 1054 } 1055 1056 if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509))) 1057 { 1058 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE); 1059 goto msg_end; 1060 } 1061 1062 i=ssl_verify_cert_chain(s,sk); 1063 1064 if (i > 0) /* we like the packet, now check the chksum */ 1065 { 1066 EVP_MD_CTX ctx; 1067 EVP_PKEY *pkey=NULL; 1068 1069 EVP_MD_CTX_init(&ctx); 1070 if (!EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL) 1071 || !EVP_VerifyUpdate(&ctx,s->s2->key_material, 1072 s->s2->key_material_length) 1073 || !EVP_VerifyUpdate(&ctx,ccd, 1074 SSL2_MIN_CERT_CHALLENGE_LENGTH)) 1075 goto msg_end; 1076 1077 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL); 1078 buf2=OPENSSL_malloc((unsigned int)i); 1079 if (buf2 == NULL) 1080 { 1081 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE); 1082 goto msg_end; 1083 } 1084 p2=buf2; 1085 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2); 1086 if (!EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i)) 1087 { 1088 OPENSSL_free(buf2); 1089 goto msg_end; 1090 } 1091 OPENSSL_free(buf2); 1092 1093 pkey=X509_get_pubkey(x509); 1094 if (pkey == NULL) goto end; 1095 i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey); 1096 EVP_PKEY_free(pkey); 1097 EVP_MD_CTX_cleanup(&ctx); 1098 1099 if (i > 0) 1100 { 1101 if (s->session->peer != NULL) 1102 X509_free(s->session->peer); 1103 s->session->peer=x509; 1104 CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509); 1105 s->session->verify_result = s->verify_result; 1106 ret=1; 1107 goto end; 1108 } 1109 else 1110 { 1111 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM); 1112 goto msg_end; 1113 } 1114 } 1115 else 1116 { 1117msg_end: 1118 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE); 1119 } 1120end: 1121 sk_X509_free(sk); 1122 X509_free(x509); 1123 return(ret); 1124 } 1125 1126static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from, 1127 unsigned char *to, int padding) 1128 { 1129 RSA *rsa; 1130 int i; 1131 1132 if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)) 1133 { 1134 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY); 1135 return(-1); 1136 } 1137 if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA) 1138 { 1139 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA); 1140 return(-1); 1141 } 1142 rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa; 1143 1144 /* we have the public key */ 1145 i=RSA_private_decrypt(len,from,to,rsa,padding); 1146 if (i < 0) 1147 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB); 1148 return(i); 1149 } 1150#else /* !OPENSSL_NO_SSL2 */ 1151 1152# if PEDANTIC 1153static void *dummy=&dummy; 1154# endif 1155 1156#endif 1157