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