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 + 4; 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 < 4 */ 367 int skip_message; 368 369 do { 370 while (s->init_num < 4) { 371 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, 372 &p[s->init_num], 373 4 - s->init_num, 0); 374 if (i <= 0) { 375 s->rwstate = SSL_READING; 376 *ok = 0; 377 return i; 378 } 379 s->init_num += i; 380 } 381 382 skip_message = 0; 383 if (!s->server) 384 if (p[0] == SSL3_MT_HELLO_REQUEST) 385 /* 386 * The server may always send 'Hello Request' messages -- 387 * we are doing a handshake anyway now, so ignore them if 388 * their format is correct. Does not count for 'Finished' 389 * MAC. 390 */ 391 if (p[1] == 0 && p[2] == 0 && p[3] == 0) { 392 s->init_num = 0; 393 skip_message = 1; 394 395 if (s->msg_callback) 396 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, 397 p, 4, s, s->msg_callback_arg); 398 } 399 } 400 while (skip_message); 401 402 /* s->init_num == 4 */ 403 404 if ((mt >= 0) && (*p != mt)) { 405 al = SSL_AD_UNEXPECTED_MESSAGE; 406 SSLerr(SSL_F_SSL3_GET_MESSAGE, SSL_R_UNEXPECTED_MESSAGE); 407 goto f_err; 408 } 409 410 s->s3->tmp.message_type = *(p++); 411 412 n2l3(p, l); 413 if (l > (unsigned long)max) { 414 al = SSL_AD_ILLEGAL_PARAMETER; 415 SSLerr(SSL_F_SSL3_GET_MESSAGE, SSL_R_EXCESSIVE_MESSAGE_SIZE); 416 goto f_err; 417 } 418 if (l > (INT_MAX - 4)) { /* BUF_MEM_grow takes an 'int' parameter */ 419 al = SSL_AD_ILLEGAL_PARAMETER; 420 SSLerr(SSL_F_SSL3_GET_MESSAGE, SSL_R_EXCESSIVE_MESSAGE_SIZE); 421 goto f_err; 422 } 423 if (l && !BUF_MEM_grow_clean(s->init_buf, (int)l + 4)) { 424 SSLerr(SSL_F_SSL3_GET_MESSAGE, ERR_R_BUF_LIB); 425 goto err; 426 } 427 s->s3->tmp.message_size = l; 428 s->state = stn; 429 430 s->init_msg = s->init_buf->data + 4; 431 s->init_num = 0; 432 } 433 434 /* next state (stn) */ 435 p = s->init_msg; 436 n = s->s3->tmp.message_size - s->init_num; 437 while (n > 0) { 438 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &p[s->init_num], 439 n, 0); 440 if (i <= 0) { 441 s->rwstate = SSL_READING; 442 *ok = 0; 443 return i; 444 } 445 s->init_num += i; 446 n -= i; 447 } 448 449#ifndef OPENSSL_NO_NEXTPROTONEG 450 /* 451 * If receiving Finished, record MAC of prior handshake messages for 452 * Finished verification. 453 */ 454 if (*s->init_buf->data == SSL3_MT_FINISHED) 455 ssl3_take_mac(s); 456#endif 457 458 /* Feed this message into MAC computation. */ 459 ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4); 460 if (s->msg_callback) 461 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, 462 (size_t)s->init_num + 4, s, s->msg_callback_arg); 463 *ok = 1; 464 return s->init_num; 465 f_err: 466 ssl3_send_alert(s, SSL3_AL_FATAL, al); 467 err: 468 *ok = 0; 469 return (-1); 470} 471 472int ssl_cert_type(X509 *x, EVP_PKEY *pkey) 473{ 474 EVP_PKEY *pk; 475 int ret = -1, i; 476 477 if (pkey == NULL) 478 pk = X509_get_pubkey(x); 479 else 480 pk = pkey; 481 if (pk == NULL) 482 goto err; 483 484 i = pk->type; 485 if (i == EVP_PKEY_RSA) { 486 ret = SSL_PKEY_RSA_ENC; 487 } else if (i == EVP_PKEY_DSA) { 488 ret = SSL_PKEY_DSA_SIGN; 489 } 490#ifndef OPENSSL_NO_EC 491 else if (i == EVP_PKEY_EC) { 492 ret = SSL_PKEY_ECC; 493 } 494#endif 495 else if (i == NID_id_GostR3410_94 || i == NID_id_GostR3410_94_cc) { 496 ret = SSL_PKEY_GOST94; 497 } else if (i == NID_id_GostR3410_2001 || i == NID_id_GostR3410_2001_cc) { 498 ret = SSL_PKEY_GOST01; 499 } else if (x && (i == EVP_PKEY_DH || i == EVP_PKEY_DHX)) { 500 /* 501 * For DH two cases: DH certificate signed with RSA and DH 502 * certificate signed with DSA. 503 */ 504 i = X509_certificate_type(x, pk); 505 if (i & EVP_PKS_RSA) 506 ret = SSL_PKEY_DH_RSA; 507 else if (i & EVP_PKS_DSA) 508 ret = SSL_PKEY_DH_DSA; 509 } 510 511 err: 512 if (!pkey) 513 EVP_PKEY_free(pk); 514 return (ret); 515} 516 517int ssl_verify_alarm_type(long type) 518{ 519 int al; 520 521 switch (type) { 522 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: 523 case X509_V_ERR_UNABLE_TO_GET_CRL: 524 case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: 525 al = SSL_AD_UNKNOWN_CA; 526 break; 527 case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: 528 case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: 529 case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: 530 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: 531 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: 532 case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: 533 case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: 534 case X509_V_ERR_CERT_NOT_YET_VALID: 535 case X509_V_ERR_CRL_NOT_YET_VALID: 536 case X509_V_ERR_CERT_UNTRUSTED: 537 case X509_V_ERR_CERT_REJECTED: 538 al = SSL_AD_BAD_CERTIFICATE; 539 break; 540 case X509_V_ERR_CERT_SIGNATURE_FAILURE: 541 case X509_V_ERR_CRL_SIGNATURE_FAILURE: 542 al = SSL_AD_DECRYPT_ERROR; 543 break; 544 case X509_V_ERR_CERT_HAS_EXPIRED: 545 case X509_V_ERR_CRL_HAS_EXPIRED: 546 al = SSL_AD_CERTIFICATE_EXPIRED; 547 break; 548 case X509_V_ERR_CERT_REVOKED: 549 al = SSL_AD_CERTIFICATE_REVOKED; 550 break; 551 case X509_V_ERR_OUT_OF_MEM: 552 al = SSL_AD_INTERNAL_ERROR; 553 break; 554 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: 555 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: 556 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: 557 case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: 558 case X509_V_ERR_CERT_CHAIN_TOO_LONG: 559 case X509_V_ERR_PATH_LENGTH_EXCEEDED: 560 case X509_V_ERR_INVALID_CA: 561 al = SSL_AD_UNKNOWN_CA; 562 break; 563 case X509_V_ERR_APPLICATION_VERIFICATION: 564 al = SSL_AD_HANDSHAKE_FAILURE; 565 break; 566 case X509_V_ERR_INVALID_PURPOSE: 567 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 568 break; 569 default: 570 al = SSL_AD_CERTIFICATE_UNKNOWN; 571 break; 572 } 573 return (al); 574} 575 576#ifndef OPENSSL_NO_BUF_FREELISTS 577/*- 578 * On some platforms, malloc() performance is bad enough that you can't just 579 * free() and malloc() buffers all the time, so we need to use freelists from 580 * unused buffers. Currently, each freelist holds memory chunks of only a 581 * given size (list->chunklen); other sized chunks are freed and malloced. 582 * This doesn't help much if you're using many different SSL option settings 583 * with a given context. (The options affecting buffer size are 584 * max_send_fragment, read buffer vs write buffer, 585 * SSL_OP_MICROSOFT_BIG_WRITE_BUFFER, SSL_OP_NO_COMPRESSION, and 586 * SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS.) Using a separate freelist for every 587 * possible size is not an option, since max_send_fragment can take on many 588 * different values. 589 * 590 * If you are on a platform with a slow malloc(), and you're using SSL 591 * connections with many different settings for these options, and you need to 592 * use the SSL_MOD_RELEASE_BUFFERS feature, you have a few options: 593 * - Link against a faster malloc implementation. 594 * - Use a separate SSL_CTX for each option set. 595 * - Improve this code. 596 */ 597static void *freelist_extract(SSL_CTX *ctx, int for_read, int sz) 598{ 599 SSL3_BUF_FREELIST *list; 600 SSL3_BUF_FREELIST_ENTRY *ent = NULL; 601 void *result = NULL; 602 603 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 604 list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist; 605 if (list != NULL && sz == (int)list->chunklen) 606 ent = list->head; 607 if (ent != NULL) { 608 list->head = ent->next; 609 result = ent; 610 if (--list->len == 0) 611 list->chunklen = 0; 612 } 613 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 614 if (!result) 615 result = OPENSSL_malloc(sz); 616 return result; 617} 618 619static void freelist_insert(SSL_CTX *ctx, int for_read, size_t sz, void *mem) 620{ 621 SSL3_BUF_FREELIST *list; 622 SSL3_BUF_FREELIST_ENTRY *ent; 623 624 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 625 list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist; 626 if (list != NULL && 627 (sz == list->chunklen || list->chunklen == 0) && 628 list->len < ctx->freelist_max_len && sz >= sizeof(*ent)) { 629 list->chunklen = sz; 630 ent = mem; 631 ent->next = list->head; 632 list->head = ent; 633 ++list->len; 634 mem = NULL; 635 } 636 637 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 638 if (mem) 639 OPENSSL_free(mem); 640} 641#else 642# define freelist_extract(c,fr,sz) OPENSSL_malloc(sz) 643# define freelist_insert(c,fr,sz,m) OPENSSL_free(m) 644#endif 645 646int ssl3_setup_read_buffer(SSL *s) 647{ 648 unsigned char *p; 649 size_t len, align = 0, headerlen; 650 651 if (SSL_IS_DTLS(s)) 652 headerlen = DTLS1_RT_HEADER_LENGTH; 653 else 654 headerlen = SSL3_RT_HEADER_LENGTH; 655 656#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 657 align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1); 658#endif 659 660 if (s->s3->rbuf.buf == NULL) { 661 len = SSL3_RT_MAX_PLAIN_LENGTH 662 + SSL3_RT_MAX_ENCRYPTED_OVERHEAD + headerlen + align; 663 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER) { 664 s->s3->init_extra = 1; 665 len += SSL3_RT_MAX_EXTRA; 666 } 667#ifndef OPENSSL_NO_COMP 668 if (!(s->options & SSL_OP_NO_COMPRESSION)) 669 len += SSL3_RT_MAX_COMPRESSED_OVERHEAD; 670#endif 671 if ((p = freelist_extract(s->ctx, 1, len)) == NULL) 672 goto err; 673 s->s3->rbuf.buf = p; 674 s->s3->rbuf.len = len; 675 } 676 677 s->packet = &(s->s3->rbuf.buf[0]); 678 return 1; 679 680 err: 681 SSLerr(SSL_F_SSL3_SETUP_READ_BUFFER, ERR_R_MALLOC_FAILURE); 682 return 0; 683} 684 685int ssl3_setup_write_buffer(SSL *s) 686{ 687 unsigned char *p; 688 size_t len, align = 0, headerlen; 689 690 if (SSL_IS_DTLS(s)) 691 headerlen = DTLS1_RT_HEADER_LENGTH + 1; 692 else 693 headerlen = SSL3_RT_HEADER_LENGTH; 694 695#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 696 align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1); 697#endif 698 699 if (s->s3->wbuf.buf == NULL) { 700 len = s->max_send_fragment 701 + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align; 702#ifndef OPENSSL_NO_COMP 703 if (!(s->options & SSL_OP_NO_COMPRESSION)) 704 len += SSL3_RT_MAX_COMPRESSED_OVERHEAD; 705#endif 706 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 707 len += headerlen + align + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD; 708 709 if ((p = freelist_extract(s->ctx, 0, len)) == NULL) 710 goto err; 711 s->s3->wbuf.buf = p; 712 s->s3->wbuf.len = len; 713 } 714 715 return 1; 716 717 err: 718 SSLerr(SSL_F_SSL3_SETUP_WRITE_BUFFER, ERR_R_MALLOC_FAILURE); 719 return 0; 720} 721 722int ssl3_setup_buffers(SSL *s) 723{ 724 if (!ssl3_setup_read_buffer(s)) 725 return 0; 726 if (!ssl3_setup_write_buffer(s)) 727 return 0; 728 return 1; 729} 730 731int ssl3_release_write_buffer(SSL *s) 732{ 733 if (s->s3->wbuf.buf != NULL) { 734 freelist_insert(s->ctx, 0, s->s3->wbuf.len, s->s3->wbuf.buf); 735 s->s3->wbuf.buf = NULL; 736 } 737 return 1; 738} 739 740int ssl3_release_read_buffer(SSL *s) 741{ 742 if (s->s3->rbuf.buf != NULL) { 743 freelist_insert(s->ctx, 1, s->s3->rbuf.len, s->s3->rbuf.buf); 744 s->s3->rbuf.buf = NULL; 745 } 746 return 1; 747} 748