s2_clnt.c revision 55714
1/* ssl/s2_clnt.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#ifndef NO_RSA 60#include <stdio.h> 61#include <openssl/rand.h> 62#include <openssl/buffer.h> 63#include <openssl/objects.h> 64#include "ssl_locl.h" 65#include <openssl/evp.h> 66 67static SSL_METHOD *ssl2_get_client_method(int ver); 68static int get_server_finished(SSL *s); 69static int get_server_verify(SSL *s); 70static int get_server_hello(SSL *s); 71static int client_hello(SSL *s); 72static int client_master_key(SSL *s); 73static int client_finished(SSL *s); 74static int client_certificate(SSL *s); 75static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from, 76 unsigned char *to,int padding); 77#define BREAK break 78 79static SSL_METHOD *ssl2_get_client_method(int ver) 80 { 81 if (ver == SSL2_VERSION) 82 return(SSLv2_client_method()); 83 else 84 return(NULL); 85 } 86 87SSL_METHOD *SSLv2_client_method(void) 88 { 89 static int init=1; 90 static SSL_METHOD SSLv2_client_data; 91 92 if (init) 93 { 94 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(), 95 sizeof(SSL_METHOD)); 96 SSLv2_client_data.ssl_connect=ssl2_connect; 97 SSLv2_client_data.get_ssl_method=ssl2_get_client_method; 98 init=0; 99 } 100 return(&SSLv2_client_data); 101 } 102 103int ssl2_connect(SSL *s) 104 { 105 unsigned long l=time(NULL); 106 BUF_MEM *buf=NULL; 107 int ret= -1; 108 void (*cb)()=NULL; 109 int new_state,state; 110 111 RAND_seed(&l,sizeof(l)); 112 ERR_clear_error(); 113 clear_sys_error(); 114 115 if (s->info_callback != NULL) 116 cb=s->info_callback; 117 else if (s->ctx->info_callback != NULL) 118 cb=s->ctx->info_callback; 119 120 /* init things to blank */ 121 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 122 s->in_handshake++; 123 124 for (;;) 125 { 126 state=s->state; 127 128 switch (s->state) 129 { 130 case SSL_ST_BEFORE: 131 case SSL_ST_CONNECT: 132 case SSL_ST_BEFORE|SSL_ST_CONNECT: 133 case SSL_ST_OK|SSL_ST_CONNECT: 134 135 s->server=0; 136 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 137 138 s->version=SSL2_VERSION; 139 s->type=SSL_ST_CONNECT; 140 141 buf=s->init_buf; 142 if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL)) 143 { 144 ret= -1; 145 goto end; 146 } 147 if (!BUF_MEM_grow(buf, 148 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 149 { 150 ret= -1; 151 goto end; 152 } 153 s->init_buf=buf; 154 s->init_num=0; 155 s->state=SSL2_ST_SEND_CLIENT_HELLO_A; 156 s->ctx->stats.sess_connect++; 157 s->handshake_func=ssl2_connect; 158 BREAK; 159 160 case SSL2_ST_SEND_CLIENT_HELLO_A: 161 case SSL2_ST_SEND_CLIENT_HELLO_B: 162 s->shutdown=0; 163 ret=client_hello(s); 164 if (ret <= 0) goto end; 165 s->init_num=0; 166 s->state=SSL2_ST_GET_SERVER_HELLO_A; 167 BREAK; 168 169 case SSL2_ST_GET_SERVER_HELLO_A: 170 case SSL2_ST_GET_SERVER_HELLO_B: 171 ret=get_server_hello(s); 172 if (ret <= 0) goto end; 173 s->init_num=0; 174 if (!s->hit) /* new session */ 175 { 176 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A; 177 BREAK; 178 } 179 else 180 { 181 s->state=SSL2_ST_CLIENT_START_ENCRYPTION; 182 break; 183 } 184 185 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A: 186 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B: 187 ret=client_master_key(s); 188 if (ret <= 0) goto end; 189 s->init_num=0; 190 s->state=SSL2_ST_CLIENT_START_ENCRYPTION; 191 break; 192 193 case SSL2_ST_CLIENT_START_ENCRYPTION: 194 /* Ok, we now have all the stuff needed to 195 * start encrypting, so lets fire it up :-) */ 196 if (!ssl2_enc_init(s,1)) 197 { 198 ret= -1; 199 goto end; 200 } 201 s->s2->clear_text=0; 202 s->state=SSL2_ST_SEND_CLIENT_FINISHED_A; 203 break; 204 205 case SSL2_ST_SEND_CLIENT_FINISHED_A: 206 case SSL2_ST_SEND_CLIENT_FINISHED_B: 207 ret=client_finished(s); 208 if (ret <= 0) goto end; 209 s->init_num=0; 210 s->state=SSL2_ST_GET_SERVER_VERIFY_A; 211 break; 212 213 case SSL2_ST_GET_SERVER_VERIFY_A: 214 case SSL2_ST_GET_SERVER_VERIFY_B: 215 ret=get_server_verify(s); 216 if (ret <= 0) goto end; 217 s->init_num=0; 218 s->state=SSL2_ST_GET_SERVER_FINISHED_A; 219 break; 220 221 case SSL2_ST_GET_SERVER_FINISHED_A: 222 case SSL2_ST_GET_SERVER_FINISHED_B: 223 ret=get_server_finished(s); 224 if (ret <= 0) goto end; 225 break; 226 227 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A: 228 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B: 229 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C: 230 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D: 231 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE: 232 ret=client_certificate(s); 233 if (ret <= 0) goto end; 234 s->init_num=0; 235 s->state=SSL2_ST_GET_SERVER_FINISHED_A; 236 break; 237 238 case SSL_ST_OK: 239 if (s->init_buf != NULL) 240 { 241 BUF_MEM_free(s->init_buf); 242 s->init_buf=NULL; 243 } 244 s->init_num=0; 245 /* ERR_clear_error();*/ 246 247 /* If we want to cache session-ids in the client 248 * and we sucessfully add the session-id to the 249 * cache, and there is a callback, then pass it out. 250 * 26/11/96 - eay - only add if not a re-used session. 251 */ 252 253 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 254 if (s->hit) s->ctx->stats.sess_hit++; 255 256 ret=1; 257 /* s->server=0; */ 258 s->ctx->stats.sess_connect_good++; 259 260 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 261 262 goto end; 263 /* break; */ 264 default: 265 SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE); 266 return(-1); 267 /* break; */ 268 } 269 270 if ((cb != NULL) && (s->state != state)) 271 { 272 new_state=s->state; 273 s->state=state; 274 cb(s,SSL_CB_CONNECT_LOOP,1); 275 s->state=new_state; 276 } 277 } 278end: 279 s->in_handshake--; 280 if (cb != NULL) 281 cb(s,SSL_CB_CONNECT_EXIT,ret); 282 return(ret); 283 } 284 285static int get_server_hello(SSL *s) 286 { 287 unsigned char *buf; 288 unsigned char *p; 289 int i,j; 290 STACK_OF(SSL_CIPHER) *sk=NULL,*cl; 291 292 buf=(unsigned char *)s->init_buf->data; 293 p=buf; 294 if (s->state == SSL2_ST_GET_SERVER_HELLO_A) 295 { 296 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num); 297 if (i < (11-s->init_num)) 298 return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i)); 299 300 if (*(p++) != SSL2_MT_SERVER_HELLO) 301 { 302 if (p[-1] != SSL2_MT_ERROR) 303 { 304 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 305 SSLerr(SSL_F_GET_SERVER_HELLO, 306 SSL_R_READ_WRONG_PACKET_TYPE); 307 } 308 else 309 SSLerr(SSL_F_GET_SERVER_HELLO, 310 SSL_R_PEER_ERROR); 311 return(-1); 312 } 313 s->hit=(*(p++))?1:0; 314 s->s2->tmp.cert_type= *(p++); 315 n2s(p,i); 316 if (i < s->version) s->version=i; 317 n2s(p,i); s->s2->tmp.cert_length=i; 318 n2s(p,i); s->s2->tmp.csl=i; 319 n2s(p,i); s->s2->tmp.conn_id_length=i; 320 s->state=SSL2_ST_GET_SERVER_HELLO_B; 321 s->init_num=0; 322 } 323 324 /* SSL2_ST_GET_SERVER_HELLO_B */ 325 j=s->s2->tmp.cert_length+s->s2->tmp.csl+s->s2->tmp.conn_id_length 326 - s->init_num; 327 i=ssl2_read(s,(char *)&(buf[s->init_num]),j); 328 if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i)); 329 330 /* things are looking good */ 331 332 p=buf; 333 if (s->hit) 334 { 335 if (s->s2->tmp.cert_length != 0) 336 { 337 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO); 338 return(-1); 339 } 340 if (s->s2->tmp.cert_type != 0) 341 { 342 if (!(s->options & 343 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG)) 344 { 345 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO); 346 return(-1); 347 } 348 } 349 if (s->s2->tmp.csl != 0) 350 { 351 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO); 352 return(-1); 353 } 354 } 355 else 356 { 357#ifdef undef 358 /* very bad */ 359 memset(s->session->session_id,0, 360 SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES); 361 s->session->session_id_length=0; 362 */ 363#endif 364 365 /* we need to do this incase we were trying to reuse a 366 * client session but others are already reusing it. 367 * If this was a new 'blank' session ID, the session-id 368 * length will still be 0 */ 369 if (s->session->session_id_length > 0) 370 { 371 if (!ssl_get_new_session(s,0)) 372 { 373 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 374 return(-1); 375 } 376 } 377 378 if (ssl2_set_certificate(s,s->s2->tmp.cert_type, 379 s->s2->tmp.cert_length,p) <= 0) 380 { 381 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE); 382 return(-1); 383 } 384 p+=s->s2->tmp.cert_length; 385 386 if (s->s2->tmp.csl == 0) 387 { 388 ssl2_return_error(s,SSL2_PE_NO_CIPHER); 389 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST); 390 return(-1); 391 } 392 393 /* We have just received a list of ciphers back from the 394 * server. We need to get the ones that match, then select 395 * the one we want the most :-). */ 396 397 /* load the ciphers */ 398 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl, 399 &s->session->ciphers); 400 p+=s->s2->tmp.csl; 401 if (sk == NULL) 402 { 403 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 404 SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE); 405 return(-1); 406 } 407 408 sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp); 409 410 /* get the array of ciphers we will accept */ 411 cl=ssl_get_ciphers_by_id(s); 412 413 /* In theory we could have ciphers sent back that we 414 * don't want to use but that does not matter since we 415 * will check against the list we origionally sent and 416 * for performance reasons we should not bother to match 417 * the two lists up just to check. */ 418 for (i=0; i<sk_SSL_CIPHER_num(cl); i++) 419 { 420 if (sk_SSL_CIPHER_find(sk, 421 sk_SSL_CIPHER_value(cl,i)) >= 0) 422 break; 423 } 424 425 if (i >= sk_SSL_CIPHER_num(cl)) 426 { 427 ssl2_return_error(s,SSL2_PE_NO_CIPHER); 428 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH); 429 return(-1); 430 } 431 s->session->cipher=sk_SSL_CIPHER_value(cl,i); 432 } 433 434 if (s->session->peer != NULL) 435 X509_free(s->session->peer); 436 437#if 0 /* What is all this meant to accomplish?? */ 438 /* hmmm, can we have the problem of the other session with this 439 * cert, Free's it before we increment the reference count. */ 440 CRYPTO_w_lock(CRYPTO_LOCK_X509); 441 s->session->peer=s->session->sess_cert->key->x509; 442 /* Shouldn't do this: already locked */ 443 /*CRYPTO_add(&s->session->peer->references,1,CRYPTO_LOCK_X509);*/ 444 s->session->peer->references++; 445 CRYPTO_w_unlock(CRYPTO_LOCK_X509); 446#else 447 s->session->peer = s->session->sess_cert->peer_key->x509; 448 /* peer_key->x509 has been set by ssl2_set_certificate. */ 449 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509); 450#endif 451 452 s->s2->conn_id_length=s->s2->tmp.conn_id_length; 453 memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length); 454 return(1); 455 } 456 457static int client_hello(SSL *s) 458 { 459 unsigned char *buf; 460 unsigned char *p,*d; 461/* CIPHER **cipher;*/ 462 int i,n,j; 463 464 buf=(unsigned char *)s->init_buf->data; 465 if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A) 466 { 467 if ((s->session == NULL) || 468 (s->session->ssl_version != s->version)) 469 { 470 if (!ssl_get_new_session(s,0)) 471 { 472 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 473 return(-1); 474 } 475 } 476 /* else use the pre-loaded session */ 477 478 p=buf; /* header */ 479 d=p+9; /* data section */ 480 *(p++)=SSL2_MT_CLIENT_HELLO; /* type */ 481 s2n(SSL2_VERSION,p); /* version */ 482 n=j=0; 483 484 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d); 485 d+=n; 486 487 if (n == 0) 488 { 489 SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 490 return(-1); 491 } 492 493 s2n(n,p); /* cipher spec num bytes */ 494 495 if ((s->session->session_id_length > 0) && 496 (s->session->session_id_length <= 497 SSL2_MAX_SSL_SESSION_ID_LENGTH)) 498 { 499 i=s->session->session_id_length; 500 s2n(i,p); /* session id length */ 501 memcpy(d,s->session->session_id,(unsigned int)i); 502 d+=i; 503 } 504 else 505 { 506 s2n(0,p); 507 } 508 509 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH; 510 s2n(SSL2_CHALLENGE_LENGTH,p); /* challenge length */ 511 /*challenge id data*/ 512 RAND_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH); 513 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH); 514 d+=SSL2_CHALLENGE_LENGTH; 515 516 s->state=SSL2_ST_SEND_CLIENT_HELLO_B; 517 s->init_num=d-buf; 518 s->init_off=0; 519 } 520 /* SSL2_ST_SEND_CLIENT_HELLO_B */ 521 return(ssl2_do_write(s)); 522 } 523 524static int client_master_key(SSL *s) 525 { 526 unsigned char *buf; 527 unsigned char *p,*d; 528 int clear,enc,karg,i; 529 SSL_SESSION *sess; 530 const EVP_CIPHER *c; 531 const EVP_MD *md; 532 533 buf=(unsigned char *)s->init_buf->data; 534 if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A) 535 { 536 537 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL)) 538 { 539 ssl2_return_error(s,SSL2_PE_NO_CIPHER); 540 SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); 541 return(-1); 542 } 543 sess=s->session; 544 p=buf; 545 d=p+10; 546 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */ 547 548 i=ssl_put_cipher_by_char(s,sess->cipher,p); 549 p+=i; 550 551 /* make key_arg data */ 552 i=EVP_CIPHER_iv_length(c); 553 sess->key_arg_length=i; 554 if (i > 0) RAND_bytes(sess->key_arg,i); 555 556 /* make a master key */ 557 i=EVP_CIPHER_key_length(c); 558 sess->master_key_length=i; 559 if (i > 0) RAND_bytes(sess->master_key,i); 560 561 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC) 562 enc=8; 563 else if (SSL_C_IS_EXPORT(sess->cipher)) 564 enc=5; 565 else 566 enc=i; 567 568 if (i < enc) 569 { 570 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 571 SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR); 572 return(-1); 573 } 574 clear=i-enc; 575 s2n(clear,p); 576 memcpy(d,sess->master_key,(unsigned int)clear); 577 d+=clear; 578 579 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc, 580 &(sess->master_key[clear]),d, 581 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING); 582 if (enc <= 0) 583 { 584 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 585 SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR); 586 return(-1); 587 } 588#ifdef PKCS1_CHECK 589 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++; 590 if (s->options & SSL_OP_PKCS1_CHECK_2) 591 sess->master_key[clear]++; 592#endif 593 s2n(enc,p); 594 d+=enc; 595 karg=sess->key_arg_length; 596 s2n(karg,p); /* key arg size */ 597 memcpy(d,sess->key_arg,(unsigned int)karg); 598 d+=karg; 599 600 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B; 601 s->init_num=d-buf; 602 s->init_off=0; 603 } 604 605 /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */ 606 return(ssl2_do_write(s)); 607 } 608 609static int client_finished(SSL *s) 610 { 611 unsigned char *p; 612 613 if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A) 614 { 615 p=(unsigned char *)s->init_buf->data; 616 *(p++)=SSL2_MT_CLIENT_FINISHED; 617 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length); 618 619 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B; 620 s->init_num=s->s2->conn_id_length+1; 621 s->init_off=0; 622 } 623 return(ssl2_do_write(s)); 624 } 625 626/* read the data and then respond */ 627static int client_certificate(SSL *s) 628 { 629 unsigned char *buf; 630 unsigned char *p,*d; 631 int i; 632 unsigned int n; 633 int cert_ch_len=0; 634 unsigned char *cert_ch; 635 636 buf=(unsigned char *)s->init_buf->data; 637 cert_ch= &(buf[2]); 638 639 /* We have a cert associated with the SSL, so attach it to 640 * the session if it does not have one */ 641 642 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A) 643 { 644 i=ssl2_read(s,(char *)&(buf[s->init_num]), 645 SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num); 646 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num)) 647 return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i)); 648 649 /* type=buf[0]; */ 650 /* type eq x509 */ 651 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) 652 { 653 ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE); 654 SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE); 655 return(-1); 656 } 657 cert_ch_len=i-1; 658 659 if ((s->cert == NULL) || 660 (s->cert->key->x509 == NULL) || 661 (s->cert->key->privatekey == NULL)) 662 { 663 s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE; 664 } 665 else 666 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C; 667 } 668 669 if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE) 670 { 671 X509 *x509=NULL; 672 EVP_PKEY *pkey=NULL; 673 674 /* If we get an error we need to 675 * ssl->rwstate=SSL_X509_LOOKUP; 676 * return(error); 677 * We should then be retried when things are ok and we 678 * can get a cert or not */ 679 680 i=0; 681 if (s->ctx->client_cert_cb != NULL) 682 { 683 i=s->ctx->client_cert_cb(s,&(x509),&(pkey)); 684 } 685 686 if (i < 0) 687 { 688 s->rwstate=SSL_X509_LOOKUP; 689 return(-1); 690 } 691 s->rwstate=SSL_NOTHING; 692 693 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 694 { 695 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C; 696 if ( !SSL_use_certificate(s,x509) || 697 !SSL_use_PrivateKey(s,pkey)) 698 { 699 i=0; 700 } 701 X509_free(x509); 702 EVP_PKEY_free(pkey); 703 } 704 else if (i == 1) 705 { 706 if (x509 != NULL) X509_free(x509); 707 if (pkey != NULL) EVP_PKEY_free(pkey); 708 SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 709 i=0; 710 } 711 712 if (i == 0) 713 { 714 /* We have no client certificate to respond with 715 * so send the correct error message back */ 716 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B; 717 p=buf; 718 *(p++)=SSL2_MT_ERROR; 719 s2n(SSL2_PE_NO_CERTIFICATE,p); 720 s->init_off=0; 721 s->init_num=3; 722 /* Write is done at the end */ 723 } 724 } 725 726 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B) 727 { 728 return(ssl2_do_write(s)); 729 } 730 731 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C) 732 { 733 EVP_MD_CTX ctx; 734 735 /* ok, now we calculate the checksum 736 * do it first so we can reuse buf :-) */ 737 p=buf; 738 EVP_SignInit(&ctx,s->ctx->rsa_md5); 739 EVP_SignUpdate(&ctx,s->s2->key_material, 740 (unsigned int)s->s2->key_material_length); 741 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len); 742 n=i2d_X509(s->session->sess_cert->peer_key->x509,&p); 743 EVP_SignUpdate(&ctx,buf,(unsigned int)n); 744 745 p=buf; 746 d=p+6; 747 *(p++)=SSL2_MT_CLIENT_CERTIFICATE; 748 *(p++)=SSL2_CT_X509_CERTIFICATE; 749 n=i2d_X509(s->cert->key->x509,&d); 750 s2n(n,p); 751 752 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey)) 753 { 754 /* this is not good. If things have failed it 755 * means there so something wrong with the key. 756 * We will contiune with a 0 length signature 757 */ 758 } 759 memset(&ctx,0,sizeof(ctx)); 760 s2n(n,p); 761 d+=n; 762 763 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D; 764 s->init_num=d-buf; 765 s->init_off=0; 766 } 767 /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */ 768 return(ssl2_do_write(s)); 769 } 770 771static int get_server_verify(SSL *s) 772 { 773 unsigned char *p; 774 int i; 775 776 p=(unsigned char *)s->init_buf->data; 777 if (s->state == SSL2_ST_GET_SERVER_VERIFY_A) 778 { 779 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num); 780 if (i < (1-s->init_num)) 781 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i)); 782 783 s->state= SSL2_ST_GET_SERVER_VERIFY_B; 784 s->init_num=0; 785 if (*p != SSL2_MT_SERVER_VERIFY) 786 { 787 if (p[0] != SSL2_MT_ERROR) 788 { 789 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 790 SSLerr(SSL_F_GET_SERVER_VERIFY, 791 SSL_R_READ_WRONG_PACKET_TYPE); 792 } 793 else 794 SSLerr(SSL_F_GET_SERVER_VERIFY, 795 SSL_R_PEER_ERROR); 796 return(-1); 797 } 798 } 799 800 p=(unsigned char *)s->init_buf->data; 801 i=ssl2_read(s,(char *)&(p[s->init_num]), 802 (unsigned int)s->s2->challenge_length-s->init_num); 803 if (i < ((int)s->s2->challenge_length-s->init_num)) 804 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i)); 805 if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0) 806 { 807 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 808 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT); 809 return(-1); 810 } 811 return(1); 812 } 813 814static int get_server_finished(SSL *s) 815 { 816 unsigned char *buf; 817 unsigned char *p; 818 int i; 819 820 buf=(unsigned char *)s->init_buf->data; 821 p=buf; 822 if (s->state == SSL2_ST_GET_SERVER_FINISHED_A) 823 { 824 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num); 825 if (i < (1-s->init_num)) 826 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i)); 827 s->init_num=i; 828 if (*p == SSL2_MT_REQUEST_CERTIFICATE) 829 { 830 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A; 831 return(1); 832 } 833 else if (*p != SSL2_MT_SERVER_FINISHED) 834 { 835 if (p[0] != SSL2_MT_ERROR) 836 { 837 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 838 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE); 839 } 840 else 841 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR); 842 return(-1); 843 } 844 s->state=SSL_ST_OK; 845 s->init_num=0; 846 } 847 848 i=ssl2_read(s,(char *)&(buf[s->init_num]), 849 SSL2_SSL_SESSION_ID_LENGTH-s->init_num); 850 if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num)) 851 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i)); 852 853 if (!s->hit) /* new session */ 854 { 855 /* new session-id */ 856 /* Make sure we were not trying to re-use an old SSL_SESSION 857 * or bad things can happen */ 858 /* ZZZZZZZZZZZZZ */ 859 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH; 860 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH); 861 } 862 else 863 { 864 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG)) 865 { 866 if (memcmp(buf,s->session->session_id, 867 (unsigned int)s->session->session_id_length) != 0) 868 { 869 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); 870 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT); 871 return(-1); 872 } 873 } 874 } 875 return(1); 876 } 877 878/* loads in the certificate from the server */ 879int ssl2_set_certificate(SSL *s, int type, int len, unsigned char *data) 880 { 881 STACK_OF(X509) *sk=NULL; 882 EVP_PKEY *pkey=NULL; 883 SESS_CERT *sc=NULL; 884 int i; 885 X509 *x509=NULL; 886 int ret=0; 887 888 x509=d2i_X509(NULL,&data,(long)len); 889 if (x509 == NULL) 890 { 891 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB); 892 goto err; 893 } 894 895 if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509)) 896 { 897 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE); 898 goto err; 899 } 900 901 i=ssl_verify_cert_chain(s,sk); 902 903 if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)) 904 { 905 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED); 906 goto err; 907 } 908 909 /* server's cert for this session */ 910 sc=ssl_sess_cert_new(); 911 if (sc == NULL) 912 { 913 ret= -1; 914 goto err; 915 } 916 if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert); 917 s->session->sess_cert=sc; 918 919 sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509; 920 sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]); 921 922 pkey=X509_get_pubkey(x509); 923 x509=NULL; 924 if (pkey == NULL) 925 { 926 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY); 927 goto err; 928 } 929 if (pkey->type != EVP_PKEY_RSA) 930 { 931 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA); 932 goto err; 933 } 934 935 if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE)) 936 goto err; 937 ret=1; 938err: 939 sk_X509_free(sk); 940 X509_free(x509); 941 EVP_PKEY_free(pkey); 942 return(ret); 943 } 944 945static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from, 946 unsigned char *to, int padding) 947 { 948 EVP_PKEY *pkey=NULL; 949 int i= -1; 950 951 if ((sc == NULL) || (sc->peer_key->x509 == NULL) || 952 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL)) 953 { 954 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY); 955 return(-1); 956 } 957 if (pkey->type != EVP_PKEY_RSA) 958 { 959 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA); 960 goto end; 961 } 962 963 /* we have the public key */ 964 i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding); 965 if (i < 0) 966 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB); 967end: 968 EVP_PKEY_free(pkey); 969 return(i); 970 } 971#endif 972