s3_both.c revision 306195
1/* ssl/s3_both.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) 1998-2002 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 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * ECC cipher suite support in OpenSSL originally developed by 114 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. 115 */ 116 117#include <limits.h> 118#include <string.h> 119#include <stdio.h> 120#include "ssl_locl.h" 121#include <openssl/buffer.h> 122#include <openssl/rand.h> 123#include <openssl/objects.h> 124#include <openssl/evp.h> 125#include <openssl/x509.h> 126 127/* 128 * send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or 129 * SSL3_RT_CHANGE_CIPHER_SPEC) 130 */ 131int ssl3_do_write(SSL *s, int type) 132{ 133 int ret; 134 135 ret = ssl3_write_bytes(s, type, &s->init_buf->data[s->init_off], 136 s->init_num); 137 if (ret < 0) 138 return (-1); 139 if (type == SSL3_RT_HANDSHAKE) 140 /* 141 * should not be done for 'Hello Request's, but in that case we'll 142 * ignore the result anyway 143 */ 144 ssl3_finish_mac(s, (unsigned char *)&s->init_buf->data[s->init_off], 145 ret); 146 147 if (ret == s->init_num) { 148 if (s->msg_callback) 149 s->msg_callback(1, s->version, type, s->init_buf->data, 150 (size_t)(s->init_off + s->init_num), s, 151 s->msg_callback_arg); 152 return (1); 153 } 154 s->init_off += ret; 155 s->init_num -= ret; 156 return (0); 157} 158 159int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen) 160{ 161 unsigned char *p; 162 int i; 163 unsigned long l; 164 165 if (s->state == a) { 166 p = ssl_handshake_start(s); 167 168 i = s->method->ssl3_enc->final_finish_mac(s, 169 sender, slen, 170 s->s3->tmp.finish_md); 171 if (i <= 0) 172 return 0; 173 s->s3->tmp.finish_md_len = i; 174 memcpy(p, s->s3->tmp.finish_md, i); 175 l = i; 176 177 /* 178 * Copy the finished so we can use it for renegotiation checks 179 */ 180 if (s->type == SSL_ST_CONNECT) { 181 OPENSSL_assert(i <= EVP_MAX_MD_SIZE); 182 memcpy(s->s3->previous_client_finished, s->s3->tmp.finish_md, i); 183 s->s3->previous_client_finished_len = i; 184 } else { 185 OPENSSL_assert(i <= EVP_MAX_MD_SIZE); 186 memcpy(s->s3->previous_server_finished, s->s3->tmp.finish_md, i); 187 s->s3->previous_server_finished_len = i; 188 } 189 190#ifdef OPENSSL_SYS_WIN16 191 /* 192 * MSVC 1.5 does not clear the top bytes of the word unless I do 193 * this. 194 */ 195 l &= 0xffff; 196#endif 197 ssl_set_handshake_header(s, SSL3_MT_FINISHED, l); 198 s->state = b; 199 } 200 201 /* SSL3_ST_SEND_xxxxxx_HELLO_B */ 202 return ssl_do_write(s); 203} 204 205#ifndef OPENSSL_NO_NEXTPROTONEG 206/* 207 * ssl3_take_mac calculates the Finished MAC for the handshakes messages seen 208 * to far. 209 */ 210static void ssl3_take_mac(SSL *s) 211{ 212 const char *sender; 213 int slen; 214 /* 215 * If no new cipher setup return immediately: other functions will set 216 * the appropriate error. 217 */ 218 if (s->s3->tmp.new_cipher == NULL) 219 return; 220 if (s->state & SSL_ST_CONNECT) { 221 sender = s->method->ssl3_enc->server_finished_label; 222 slen = s->method->ssl3_enc->server_finished_label_len; 223 } else { 224 sender = s->method->ssl3_enc->client_finished_label; 225 slen = s->method->ssl3_enc->client_finished_label_len; 226 } 227 228 s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s, 229 sender, 230 slen, 231 s->s3->tmp.peer_finish_md); 232} 233#endif 234 235int ssl3_get_finished(SSL *s, int a, int b) 236{ 237 int al, i, ok; 238 long n; 239 unsigned char *p; 240 241#ifdef OPENSSL_NO_NEXTPROTONEG 242 /* 243 * the mac has already been generated when we received the change cipher 244 * spec message and is in s->s3->tmp.peer_finish_md 245 */ 246#endif 247 248 /* 64 argument should actually be 36+4 :-) */ 249 n = s->method->ssl_get_message(s, a, b, SSL3_MT_FINISHED, 64, &ok); 250 251 if (!ok) 252 return ((int)n); 253 254 /* If this occurs, we have missed a message */ 255 if (!s->s3->change_cipher_spec) { 256 al = SSL_AD_UNEXPECTED_MESSAGE; 257 SSLerr(SSL_F_SSL3_GET_FINISHED, SSL_R_GOT_A_FIN_BEFORE_A_CCS); 258 goto f_err; 259 } 260 s->s3->change_cipher_spec = 0; 261 262 p = (unsigned char *)s->init_msg; 263 i = s->s3->tmp.peer_finish_md_len; 264 265 if (i != n) { 266 al = SSL_AD_DECODE_ERROR; 267 SSLerr(SSL_F_SSL3_GET_FINISHED, SSL_R_BAD_DIGEST_LENGTH); 268 goto f_err; 269 } 270 271 if (CRYPTO_memcmp(p, s->s3->tmp.peer_finish_md, i) != 0) { 272 al = SSL_AD_DECRYPT_ERROR; 273 SSLerr(SSL_F_SSL3_GET_FINISHED, SSL_R_DIGEST_CHECK_FAILED); 274 goto f_err; 275 } 276 277 /* 278 * Copy the finished so we can use it for renegotiation checks 279 */ 280 if (s->type == SSL_ST_ACCEPT) { 281 OPENSSL_assert(i <= EVP_MAX_MD_SIZE); 282 memcpy(s->s3->previous_client_finished, s->s3->tmp.peer_finish_md, i); 283 s->s3->previous_client_finished_len = i; 284 } else { 285 OPENSSL_assert(i <= EVP_MAX_MD_SIZE); 286 memcpy(s->s3->previous_server_finished, s->s3->tmp.peer_finish_md, i); 287 s->s3->previous_server_finished_len = i; 288 } 289 290 return (1); 291 f_err: 292 ssl3_send_alert(s, SSL3_AL_FATAL, al); 293 return (0); 294} 295 296/*- 297 * for these 2 messages, we need to 298 * ssl->enc_read_ctx re-init 299 * ssl->s3->read_sequence zero 300 * ssl->s3->read_mac_secret re-init 301 * ssl->session->read_sym_enc assign 302 * ssl->session->read_compression assign 303 * ssl->session->read_hash assign 304 */ 305int ssl3_send_change_cipher_spec(SSL *s, int a, int b) 306{ 307 unsigned char *p; 308 309 if (s->state == a) { 310 p = (unsigned char *)s->init_buf->data; 311 *p = SSL3_MT_CCS; 312 s->init_num = 1; 313 s->init_off = 0; 314 315 s->state = b; 316 } 317 318 /* SSL3_ST_CW_CHANGE_B */ 319 return (ssl3_do_write(s, SSL3_RT_CHANGE_CIPHER_SPEC)); 320} 321 322unsigned long ssl3_output_cert_chain(SSL *s, CERT_PKEY *cpk) 323{ 324 unsigned char *p; 325 unsigned long l = 3 + SSL_HM_HEADER_LENGTH(s); 326 327 if (!ssl_add_cert_chain(s, cpk, &l)) 328 return 0; 329 330 l -= 3 + SSL_HM_HEADER_LENGTH(s); 331 p = ssl_handshake_start(s); 332 l2n3(l, p); 333 l += 3; 334 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE, l); 335 return l + SSL_HM_HEADER_LENGTH(s); 336} 337 338/* 339 * Obtain handshake message of message type 'mt' (any if mt == -1), maximum 340 * acceptable body length 'max'. The first four bytes (msg_type and length) 341 * are read in state 'st1', the body is read in state 'stn'. 342 */ 343long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok) 344{ 345 unsigned char *p; 346 unsigned long l; 347 long n; 348 int i, al; 349 350 if (s->s3->tmp.reuse_message) { 351 s->s3->tmp.reuse_message = 0; 352 if ((mt >= 0) && (s->s3->tmp.message_type != mt)) { 353 al = SSL_AD_UNEXPECTED_MESSAGE; 354 SSLerr(SSL_F_SSL3_GET_MESSAGE, SSL_R_UNEXPECTED_MESSAGE); 355 goto f_err; 356 } 357 *ok = 1; 358 s->state = stn; 359 s->init_msg = s->init_buf->data + SSL3_HM_HEADER_LENGTH; 360 s->init_num = (int)s->s3->tmp.message_size; 361 return s->init_num; 362 } 363 364 p = (unsigned char *)s->init_buf->data; 365 366 if (s->state == st1) { /* s->init_num < SSL3_HM_HEADER_LENGTH */ 367 int skip_message; 368 369 do { 370 while (s->init_num < SSL3_HM_HEADER_LENGTH) { 371 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, 372 &p[s->init_num], 373 SSL3_HM_HEADER_LENGTH - 374 s->init_num, 0); 375 if (i <= 0) { 376 s->rwstate = SSL_READING; 377 *ok = 0; 378 return i; 379 } 380 s->init_num += i; 381 } 382 383 skip_message = 0; 384 if (!s->server) 385 if (p[0] == SSL3_MT_HELLO_REQUEST) 386 /* 387 * The server may always send 'Hello Request' messages -- 388 * we are doing a handshake anyway now, so ignore them if 389 * their format is correct. Does not count for 'Finished' 390 * MAC. 391 */ 392 if (p[1] == 0 && p[2] == 0 && p[3] == 0) { 393 s->init_num = 0; 394 skip_message = 1; 395 396 if (s->msg_callback) 397 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, 398 p, SSL3_HM_HEADER_LENGTH, s, 399 s->msg_callback_arg); 400 } 401 } 402 while (skip_message); 403 404 /* s->init_num == SSL3_HM_HEADER_LENGTH */ 405 406 if ((mt >= 0) && (*p != mt)) { 407 al = SSL_AD_UNEXPECTED_MESSAGE; 408 SSLerr(SSL_F_SSL3_GET_MESSAGE, SSL_R_UNEXPECTED_MESSAGE); 409 goto f_err; 410 } 411 412 s->s3->tmp.message_type = *(p++); 413 414 n2l3(p, l); 415 if (l > (unsigned long)max) { 416 al = SSL_AD_ILLEGAL_PARAMETER; 417 SSLerr(SSL_F_SSL3_GET_MESSAGE, SSL_R_EXCESSIVE_MESSAGE_SIZE); 418 goto f_err; 419 } 420 /* 421 * Make buffer slightly larger than message length as a precaution 422 * against small OOB reads e.g. CVE-2016-6306 423 */ 424 if (l 425 && !BUF_MEM_grow_clean(s->init_buf, 426 (int)l + SSL3_HM_HEADER_LENGTH + 16)) { 427 SSLerr(SSL_F_SSL3_GET_MESSAGE, ERR_R_BUF_LIB); 428 goto err; 429 } 430 s->s3->tmp.message_size = l; 431 s->state = stn; 432 433 s->init_msg = s->init_buf->data + SSL3_HM_HEADER_LENGTH; 434 s->init_num = 0; 435 } 436 437 /* next state (stn) */ 438 p = s->init_msg; 439 n = s->s3->tmp.message_size - s->init_num; 440 while (n > 0) { 441 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &p[s->init_num], 442 n, 0); 443 if (i <= 0) { 444 s->rwstate = SSL_READING; 445 *ok = 0; 446 return i; 447 } 448 s->init_num += i; 449 n -= i; 450 } 451 452#ifndef OPENSSL_NO_NEXTPROTONEG 453 /* 454 * If receiving Finished, record MAC of prior handshake messages for 455 * Finished verification. 456 */ 457 if (*s->init_buf->data == SSL3_MT_FINISHED) 458 ssl3_take_mac(s); 459#endif 460 461 /* Feed this message into MAC computation. */ 462 ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, 463 s->init_num + SSL3_HM_HEADER_LENGTH); 464 if (s->msg_callback) 465 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, 466 (size_t)s->init_num + SSL3_HM_HEADER_LENGTH, s, 467 s->msg_callback_arg); 468 *ok = 1; 469 return s->init_num; 470 f_err: 471 ssl3_send_alert(s, SSL3_AL_FATAL, al); 472 err: 473 *ok = 0; 474 return (-1); 475} 476 477int ssl_cert_type(X509 *x, EVP_PKEY *pkey) 478{ 479 EVP_PKEY *pk; 480 int ret = -1, i; 481 482 if (pkey == NULL) 483 pk = X509_get_pubkey(x); 484 else 485 pk = pkey; 486 if (pk == NULL) 487 goto err; 488 489 i = pk->type; 490 if (i == EVP_PKEY_RSA) { 491 ret = SSL_PKEY_RSA_ENC; 492 } else if (i == EVP_PKEY_DSA) { 493 ret = SSL_PKEY_DSA_SIGN; 494 } 495#ifndef OPENSSL_NO_EC 496 else if (i == EVP_PKEY_EC) { 497 ret = SSL_PKEY_ECC; 498 } 499#endif 500 else if (i == NID_id_GostR3410_94 || i == NID_id_GostR3410_94_cc) { 501 ret = SSL_PKEY_GOST94; 502 } else if (i == NID_id_GostR3410_2001 || i == NID_id_GostR3410_2001_cc) { 503 ret = SSL_PKEY_GOST01; 504 } else if (x && (i == EVP_PKEY_DH || i == EVP_PKEY_DHX)) { 505 /* 506 * For DH two cases: DH certificate signed with RSA and DH 507 * certificate signed with DSA. 508 */ 509 i = X509_certificate_type(x, pk); 510 if (i & EVP_PKS_RSA) 511 ret = SSL_PKEY_DH_RSA; 512 else if (i & EVP_PKS_DSA) 513 ret = SSL_PKEY_DH_DSA; 514 } 515 516 err: 517 if (!pkey) 518 EVP_PKEY_free(pk); 519 return (ret); 520} 521 522int ssl_verify_alarm_type(long type) 523{ 524 int al; 525 526 switch (type) { 527 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: 528 case X509_V_ERR_UNABLE_TO_GET_CRL: 529 case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: 530 al = SSL_AD_UNKNOWN_CA; 531 break; 532 case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: 533 case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: 534 case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: 535 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: 536 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: 537 case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: 538 case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: 539 case X509_V_ERR_CERT_NOT_YET_VALID: 540 case X509_V_ERR_CRL_NOT_YET_VALID: 541 case X509_V_ERR_CERT_UNTRUSTED: 542 case X509_V_ERR_CERT_REJECTED: 543 case X509_V_ERR_HOSTNAME_MISMATCH: 544 case X509_V_ERR_EMAIL_MISMATCH: 545 case X509_V_ERR_IP_ADDRESS_MISMATCH: 546 al = SSL_AD_BAD_CERTIFICATE; 547 break; 548 case X509_V_ERR_CERT_SIGNATURE_FAILURE: 549 case X509_V_ERR_CRL_SIGNATURE_FAILURE: 550 al = SSL_AD_DECRYPT_ERROR; 551 break; 552 case X509_V_ERR_CERT_HAS_EXPIRED: 553 case X509_V_ERR_CRL_HAS_EXPIRED: 554 al = SSL_AD_CERTIFICATE_EXPIRED; 555 break; 556 case X509_V_ERR_CERT_REVOKED: 557 al = SSL_AD_CERTIFICATE_REVOKED; 558 break; 559 case X509_V_ERR_UNSPECIFIED: 560 case X509_V_ERR_OUT_OF_MEM: 561 case X509_V_ERR_INVALID_CALL: 562 case X509_V_ERR_STORE_LOOKUP: 563 al = SSL_AD_INTERNAL_ERROR; 564 break; 565 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: 566 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: 567 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: 568 case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: 569 case X509_V_ERR_CERT_CHAIN_TOO_LONG: 570 case X509_V_ERR_PATH_LENGTH_EXCEEDED: 571 case X509_V_ERR_INVALID_CA: 572 al = SSL_AD_UNKNOWN_CA; 573 break; 574 case X509_V_ERR_APPLICATION_VERIFICATION: 575 al = SSL_AD_HANDSHAKE_FAILURE; 576 break; 577 case X509_V_ERR_INVALID_PURPOSE: 578 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 579 break; 580 default: 581 al = SSL_AD_CERTIFICATE_UNKNOWN; 582 break; 583 } 584 return (al); 585} 586 587#ifndef OPENSSL_NO_BUF_FREELISTS 588/*- 589 * On some platforms, malloc() performance is bad enough that you can't just 590 * free() and malloc() buffers all the time, so we need to use freelists from 591 * unused buffers. Currently, each freelist holds memory chunks of only a 592 * given size (list->chunklen); other sized chunks are freed and malloced. 593 * This doesn't help much if you're using many different SSL option settings 594 * with a given context. (The options affecting buffer size are 595 * max_send_fragment, read buffer vs write buffer, 596 * SSL_OP_MICROSOFT_BIG_WRITE_BUFFER, SSL_OP_NO_COMPRESSION, and 597 * SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS.) Using a separate freelist for every 598 * possible size is not an option, since max_send_fragment can take on many 599 * different values. 600 * 601 * If you are on a platform with a slow malloc(), and you're using SSL 602 * connections with many different settings for these options, and you need to 603 * use the SSL_MOD_RELEASE_BUFFERS feature, you have a few options: 604 * - Link against a faster malloc implementation. 605 * - Use a separate SSL_CTX for each option set. 606 * - Improve this code. 607 */ 608static void *freelist_extract(SSL_CTX *ctx, int for_read, int sz) 609{ 610 SSL3_BUF_FREELIST *list; 611 SSL3_BUF_FREELIST_ENTRY *ent = NULL; 612 void *result = NULL; 613 614 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 615 list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist; 616 if (list != NULL && sz == (int)list->chunklen) 617 ent = list->head; 618 if (ent != NULL) { 619 list->head = ent->next; 620 result = ent; 621 if (--list->len == 0) 622 list->chunklen = 0; 623 } 624 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 625 if (!result) 626 result = OPENSSL_malloc(sz); 627 return result; 628} 629 630static void freelist_insert(SSL_CTX *ctx, int for_read, size_t sz, void *mem) 631{ 632 SSL3_BUF_FREELIST *list; 633 SSL3_BUF_FREELIST_ENTRY *ent; 634 635 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 636 list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist; 637 if (list != NULL && 638 (sz == list->chunklen || list->chunklen == 0) && 639 list->len < ctx->freelist_max_len && sz >= sizeof(*ent)) { 640 list->chunklen = sz; 641 ent = mem; 642 ent->next = list->head; 643 list->head = ent; 644 ++list->len; 645 mem = NULL; 646 } 647 648 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 649 if (mem) 650 OPENSSL_free(mem); 651} 652#else 653# define freelist_extract(c,fr,sz) OPENSSL_malloc(sz) 654# define freelist_insert(c,fr,sz,m) OPENSSL_free(m) 655#endif 656 657int ssl3_setup_read_buffer(SSL *s) 658{ 659 unsigned char *p; 660 size_t len, align = 0, headerlen; 661 662 if (SSL_IS_DTLS(s)) 663 headerlen = DTLS1_RT_HEADER_LENGTH; 664 else 665 headerlen = SSL3_RT_HEADER_LENGTH; 666 667#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 668 align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1); 669#endif 670 671 if (s->s3->rbuf.buf == NULL) { 672 len = SSL3_RT_MAX_PLAIN_LENGTH 673 + SSL3_RT_MAX_ENCRYPTED_OVERHEAD + headerlen + align; 674 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER) { 675 s->s3->init_extra = 1; 676 len += SSL3_RT_MAX_EXTRA; 677 } 678#ifndef OPENSSL_NO_COMP 679 if (!(s->options & SSL_OP_NO_COMPRESSION)) 680 len += SSL3_RT_MAX_COMPRESSED_OVERHEAD; 681#endif 682 if ((p = freelist_extract(s->ctx, 1, len)) == NULL) 683 goto err; 684 s->s3->rbuf.buf = p; 685 s->s3->rbuf.len = len; 686 } 687 688 s->packet = &(s->s3->rbuf.buf[0]); 689 return 1; 690 691 err: 692 SSLerr(SSL_F_SSL3_SETUP_READ_BUFFER, ERR_R_MALLOC_FAILURE); 693 return 0; 694} 695 696int ssl3_setup_write_buffer(SSL *s) 697{ 698 unsigned char *p; 699 size_t len, align = 0, headerlen; 700 701 if (SSL_IS_DTLS(s)) 702 headerlen = DTLS1_RT_HEADER_LENGTH + 1; 703 else 704 headerlen = SSL3_RT_HEADER_LENGTH; 705 706#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 707 align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1); 708#endif 709 710 if (s->s3->wbuf.buf == NULL) { 711 len = s->max_send_fragment 712 + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align; 713#ifndef OPENSSL_NO_COMP 714 if (!(s->options & SSL_OP_NO_COMPRESSION)) 715 len += SSL3_RT_MAX_COMPRESSED_OVERHEAD; 716#endif 717 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 718 len += headerlen + align + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD; 719 720 if ((p = freelist_extract(s->ctx, 0, len)) == NULL) 721 goto err; 722 s->s3->wbuf.buf = p; 723 s->s3->wbuf.len = len; 724 } 725 726 return 1; 727 728 err: 729 SSLerr(SSL_F_SSL3_SETUP_WRITE_BUFFER, ERR_R_MALLOC_FAILURE); 730 return 0; 731} 732 733int ssl3_setup_buffers(SSL *s) 734{ 735 if (!ssl3_setup_read_buffer(s)) 736 return 0; 737 if (!ssl3_setup_write_buffer(s)) 738 return 0; 739 return 1; 740} 741 742int ssl3_release_write_buffer(SSL *s) 743{ 744 if (s->s3->wbuf.buf != NULL) { 745 freelist_insert(s->ctx, 0, s->s3->wbuf.len, s->s3->wbuf.buf); 746 s->s3->wbuf.buf = NULL; 747 } 748 return 1; 749} 750 751int ssl3_release_read_buffer(SSL *s) 752{ 753 if (s->s3->rbuf.buf != NULL) { 754 freelist_insert(s->ctx, 1, s->s3->rbuf.len, s->s3->rbuf.buf); 755 s->s3->rbuf.buf = NULL; 756 } 757 return 1; 758} 759