1 /* $OpenBSD: d1_both.c,v 1.57 2019/02/10 16:42:35 phessler Exp $ */ 2 /* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. 5 */ 6 /* ==================================================================== 7 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * openssl-core@openssl.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 60 * All rights reserved. 61 * 62 * This package is an SSL implementation written 63 * by Eric Young (eay@cryptsoft.com). 64 * The implementation was written so as to conform with Netscapes SSL. 65 * 66 * This library is free for commercial and non-commercial use as long as 67 * the following conditions are aheared to. The following conditions 68 * apply to all code found in this distribution, be it the RC4, RSA, 69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 70 * included with this distribution is covered by the same copyright terms 71 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 72 * 73 * Copyright remains Eric Young's, and as such any Copyright notices in 74 * the code are not to be removed. 75 * If this package is used in a product, Eric Young should be given attribution 76 * as the author of the parts of the library used. 77 * This can be in the form of a textual message at program startup or 78 * in documentation (online or textual) provided with the package. 79 * 80 * Redistribution and use in source and binary forms, with or without 81 * modification, are permitted provided that the following conditions 82 * are met: 83 * 1. Redistributions of source code must retain the copyright 84 * notice, this list of conditions and the following disclaimer. 85 * 2. Redistributions in binary form must reproduce the above copyright 86 * notice, this list of conditions and the following disclaimer in the 87 * documentation and/or other materials provided with the distribution. 88 * 3. All advertising materials mentioning features or use of this software 89 * must display the following acknowledgement: 90 * "This product includes cryptographic software written by 91 * Eric Young (eay@cryptsoft.com)" 92 * The word 'cryptographic' can be left out if the rouines from the library 93 * being used are not cryptographic related :-). 94 * 4. If you include any Windows specific code (or a derivative thereof) from 95 * the apps directory (application code) you must include an acknowledgement: 96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 97 * 98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 108 * SUCH DAMAGE. 109 * 110 * The licence and distribution terms for any publically available version or 111 * derivative of this code cannot be changed. i.e. this code cannot simply be 112 * copied and put under another distribution licence 113 * [including the GNU Public Licence.] 114 */ 115 116 #include <limits.h> 117 #include <stdio.h> 118 #include <string.h> 119 120 #include "ssl_locl.h" 121 122 #include <openssl/buffer.h> 123 #include <openssl/evp.h> 124 #include <openssl/objects.h> 125 #include <openssl/x509.h> 126 127 #include "pqueue.h" 128 #include "bytestring.h" 129 130 #define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8) 131 132 #define RSMBLY_BITMASK_MARK(bitmask, start, end) { \ 133 if ((end) - (start) <= 8) { \ 134 long ii; \ 135 for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \ 136 } else { \ 137 long ii; \ 138 bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \ 139 for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \ 140 bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \ 141 } } 142 143 #define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \ 144 long ii; \ 145 OPENSSL_assert((msg_len) > 0); \ 146 is_complete = 1; \ 147 if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \ 148 if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \ 149 if (bitmask[ii] != 0xff) { is_complete = 0; break; } } 150 151 static unsigned char bitmask_start_values[] = { 152 0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80 153 }; 154 static unsigned char bitmask_end_values[] = { 155 0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f 156 }; 157 158 /* XDTLS: figure out the right values */ 159 static unsigned int g_probable_mtu[] = {1500 - 28, 512 - 28, 256 - 28}; 160 161 static unsigned int dtls1_guess_mtu(unsigned int curr_mtu); 162 static void dtls1_fix_message_header(SSL *s, unsigned long frag_off, 163 unsigned long frag_len); 164 static int dtls1_write_message_header(const struct hm_header_st *msg_hdr, 165 unsigned long frag_off, unsigned long frag_len, unsigned char *p); 166 static long dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, 167 int *ok); 168 169 static hm_fragment * 170 dtls1_hm_fragment_new(unsigned long frag_len, int reassembly) 171 { 172 hm_fragment *frag = NULL; 173 unsigned char *buf = NULL; 174 unsigned char *bitmask = NULL; 175 176 frag = malloc(sizeof(hm_fragment)); 177 if (frag == NULL) 178 return NULL; 179 180 if (frag_len) { 181 buf = malloc(frag_len); 182 if (buf == NULL) { 183 free(frag); 184 return NULL; 185 } 186 } 187 188 /* zero length fragment gets zero frag->fragment */ 189 frag->fragment = buf; 190 191 /* Initialize reassembly bitmask if necessary */ 192 if (reassembly) { 193 bitmask = malloc(RSMBLY_BITMASK_SIZE(frag_len)); 194 if (bitmask == NULL) { 195 free(buf); 196 free(frag); 197 return NULL; 198 } 199 memset(bitmask, 0, RSMBLY_BITMASK_SIZE(frag_len)); 200 } 201 202 frag->reassembly = bitmask; 203 204 return frag; 205 } 206 207 static void 208 dtls1_hm_fragment_free(hm_fragment *frag) 209 { 210 if (frag == NULL) 211 return; 212 213 if (frag->msg_header.is_ccs) { 214 EVP_CIPHER_CTX_free( 215 frag->msg_header.saved_retransmit_state.enc_write_ctx); 216 EVP_MD_CTX_free( 217 frag->msg_header.saved_retransmit_state.write_hash); 218 } 219 free(frag->fragment); 220 free(frag->reassembly); 221 free(frag); 222 } 223 224 /* send s->internal->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */ 225 int 226 dtls1_do_write(SSL *s, int type) 227 { 228 int ret; 229 int curr_mtu; 230 unsigned int len, frag_off, mac_size, blocksize; 231 232 /* AHA! Figure out the MTU, and stick to the right size */ 233 if (D1I(s)->mtu < dtls1_min_mtu() && 234 !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) { 235 D1I(s)->mtu = BIO_ctrl(SSL_get_wbio(s), 236 BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); 237 238 /* 239 * I've seen the kernel return bogus numbers when it 240 * doesn't know the MTU (ie., the initial write), so just 241 * make sure we have a reasonable number 242 */ 243 if (D1I(s)->mtu < dtls1_min_mtu()) { 244 D1I(s)->mtu = 0; 245 D1I(s)->mtu = dtls1_guess_mtu(D1I(s)->mtu); 246 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU, 247 D1I(s)->mtu, NULL); 248 } 249 } 250 251 OPENSSL_assert(D1I(s)->mtu >= dtls1_min_mtu()); 252 /* should have something reasonable now */ 253 254 if (s->internal->init_off == 0 && type == SSL3_RT_HANDSHAKE) 255 OPENSSL_assert(s->internal->init_num == 256 (int)D1I(s)->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH); 257 258 if (s->internal->write_hash) 259 mac_size = EVP_MD_CTX_size(s->internal->write_hash); 260 else 261 mac_size = 0; 262 263 if (s->internal->enc_write_ctx && 264 (EVP_CIPHER_mode( s->internal->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE)) 265 blocksize = 2 * EVP_CIPHER_block_size(s->internal->enc_write_ctx->cipher); 266 else 267 blocksize = 0; 268 269 frag_off = 0; 270 while (s->internal->init_num) { 271 curr_mtu = D1I(s)->mtu - BIO_wpending(SSL_get_wbio(s)) - 272 DTLS1_RT_HEADER_LENGTH - mac_size - blocksize; 273 274 if (curr_mtu <= DTLS1_HM_HEADER_LENGTH) { 275 /* grr.. we could get an error if MTU picked was wrong */ 276 ret = BIO_flush(SSL_get_wbio(s)); 277 if (ret <= 0) 278 return ret; 279 curr_mtu = D1I(s)->mtu - DTLS1_RT_HEADER_LENGTH - 280 mac_size - blocksize; 281 } 282 283 if (s->internal->init_num > curr_mtu) 284 len = curr_mtu; 285 else 286 len = s->internal->init_num; 287 288 289 /* XDTLS: this function is too long. split out the CCS part */ 290 if (type == SSL3_RT_HANDSHAKE) { 291 if (s->internal->init_off != 0) { 292 OPENSSL_assert(s->internal->init_off > DTLS1_HM_HEADER_LENGTH); 293 s->internal->init_off -= DTLS1_HM_HEADER_LENGTH; 294 s->internal->init_num += DTLS1_HM_HEADER_LENGTH; 295 296 if (s->internal->init_num > curr_mtu) 297 len = curr_mtu; 298 else 299 len = s->internal->init_num; 300 } 301 302 dtls1_fix_message_header(s, frag_off, 303 len - DTLS1_HM_HEADER_LENGTH); 304 305 if (!dtls1_write_message_header(&D1I(s)->w_msg_hdr, 306 D1I(s)->w_msg_hdr.frag_off, D1I(s)->w_msg_hdr.frag_len, 307 (unsigned char *)&s->internal->init_buf->data[s->internal->init_off])) 308 return -1; 309 310 OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH); 311 } 312 313 ret = dtls1_write_bytes(s, type, 314 &s->internal->init_buf->data[s->internal->init_off], len); 315 if (ret < 0) { 316 /* 317 * Might need to update MTU here, but we don't know 318 * which previous packet caused the failure -- so 319 * can't really retransmit anything. continue as 320 * if everything is fine and wait for an alert to 321 * handle the retransmit 322 */ 323 if (BIO_ctrl(SSL_get_wbio(s), 324 BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0) 325 D1I(s)->mtu = BIO_ctrl(SSL_get_wbio(s), 326 BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); 327 else 328 return (-1); 329 } else { 330 331 /* 332 * Bad if this assert fails, only part of the 333 * handshake message got sent. but why would 334 * this happen? 335 */ 336 OPENSSL_assert(len == (unsigned int)ret); 337 338 if (type == SSL3_RT_HANDSHAKE && 339 !D1I(s)->retransmitting) { 340 /* 341 * Should not be done for 'Hello Request's, 342 * but in that case we'll ignore the result 343 * anyway 344 */ 345 unsigned char *p = (unsigned char *)&s->internal->init_buf->data[s->internal->init_off]; 346 const struct hm_header_st *msg_hdr = &D1I(s)->w_msg_hdr; 347 int xlen; 348 349 if (frag_off == 0) { 350 /* 351 * Reconstruct message header is if it 352 * is being sent in single fragment 353 */ 354 if (!dtls1_write_message_header(msg_hdr, 355 0, msg_hdr->msg_len, p)) 356 return (-1); 357 xlen = ret; 358 } else { 359 p += DTLS1_HM_HEADER_LENGTH; 360 xlen = ret - DTLS1_HM_HEADER_LENGTH; 361 } 362 363 tls1_transcript_record(s, p, xlen); 364 } 365 366 if (ret == s->internal->init_num) { 367 if (s->internal->msg_callback) 368 s->internal->msg_callback(1, s->version, type, 369 s->internal->init_buf->data, 370 (size_t)(s->internal->init_off + s->internal->init_num), 371 s, s->internal->msg_callback_arg); 372 373 s->internal->init_off = 0; 374 /* done writing this message */ 375 s->internal->init_num = 0; 376 377 return (1); 378 } 379 s->internal->init_off += ret; 380 s->internal->init_num -= ret; 381 frag_off += (ret -= DTLS1_HM_HEADER_LENGTH); 382 } 383 } 384 return (0); 385 } 386 387 388 /* 389 * Obtain handshake message of message type 'mt' (any if mt == -1), 390 * maximum acceptable body length 'max'. 391 * Read an entire handshake message. Handshake messages arrive in 392 * fragments. 393 */ 394 long 395 dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok) 396 { 397 int i, al; 398 struct hm_header_st *msg_hdr; 399 unsigned char *p; 400 unsigned long msg_len; 401 402 /* 403 * s3->internal->tmp is used to store messages that are unexpected, caused 404 * by the absence of an optional handshake message 405 */ 406 if (S3I(s)->tmp.reuse_message) { 407 S3I(s)->tmp.reuse_message = 0; 408 if ((mt >= 0) && (S3I(s)->tmp.message_type != mt)) { 409 al = SSL_AD_UNEXPECTED_MESSAGE; 410 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 411 goto f_err; 412 } 413 *ok = 1; 414 s->internal->init_msg = s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH; 415 s->internal->init_num = (int)S3I(s)->tmp.message_size; 416 return s->internal->init_num; 417 } 418 419 msg_hdr = &D1I(s)->r_msg_hdr; 420 memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); 421 422 again: 423 i = dtls1_get_message_fragment(s, st1, stn, max, ok); 424 if (i == DTLS1_HM_BAD_FRAGMENT || 425 i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */ 426 goto again; 427 else if (i <= 0 && !*ok) 428 return i; 429 430 p = (unsigned char *)s->internal->init_buf->data; 431 msg_len = msg_hdr->msg_len; 432 433 /* reconstruct message header */ 434 if (!dtls1_write_message_header(msg_hdr, 0, msg_len, p)) 435 return -1; 436 437 msg_len += DTLS1_HM_HEADER_LENGTH; 438 439 tls1_transcript_record(s, p, msg_len); 440 if (s->internal->msg_callback) 441 s->internal->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, msg_len, 442 s, s->internal->msg_callback_arg); 443 444 memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); 445 446 /* Don't change sequence numbers while listening */ 447 if (!D1I(s)->listen) 448 D1I(s)->handshake_read_seq++; 449 450 s->internal->init_msg = s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH; 451 return s->internal->init_num; 452 453 f_err: 454 ssl3_send_alert(s, SSL3_AL_FATAL, al); 455 *ok = 0; 456 return -1; 457 } 458 459 460 static int 461 dtls1_preprocess_fragment(SSL *s, struct hm_header_st *msg_hdr, int max) 462 { 463 size_t frag_off, frag_len, msg_len; 464 465 msg_len = msg_hdr->msg_len; 466 frag_off = msg_hdr->frag_off; 467 frag_len = msg_hdr->frag_len; 468 469 /* sanity checking */ 470 if ((frag_off + frag_len) > msg_len) { 471 SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE); 472 return SSL_AD_ILLEGAL_PARAMETER; 473 } 474 475 if ((frag_off + frag_len) > (unsigned long)max) { 476 SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE); 477 return SSL_AD_ILLEGAL_PARAMETER; 478 } 479 480 if ( D1I(s)->r_msg_hdr.frag_off == 0) /* first fragment */ 481 { 482 /* 483 * msg_len is limited to 2^24, but is effectively checked 484 * against max above 485 */ 486 if (!BUF_MEM_grow_clean(s->internal->init_buf, 487 msg_len + DTLS1_HM_HEADER_LENGTH)) { 488 SSLerror(s, ERR_R_BUF_LIB); 489 return SSL_AD_INTERNAL_ERROR; 490 } 491 492 S3I(s)->tmp.message_size = msg_len; 493 D1I(s)->r_msg_hdr.msg_len = msg_len; 494 S3I(s)->tmp.message_type = msg_hdr->type; 495 D1I(s)->r_msg_hdr.type = msg_hdr->type; 496 D1I(s)->r_msg_hdr.seq = msg_hdr->seq; 497 } else if (msg_len != D1I(s)->r_msg_hdr.msg_len) { 498 /* 499 * They must be playing with us! BTW, failure to enforce 500 * upper limit would open possibility for buffer overrun. 501 */ 502 SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE); 503 return SSL_AD_ILLEGAL_PARAMETER; 504 } 505 506 return 0; /* no error */ 507 } 508 509 static int 510 dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok) 511 { 512 /* 513 * (0) check whether the desired fragment is available 514 * if so: 515 * (1) copy over the fragment to s->internal->init_buf->data[] 516 * (2) update s->internal->init_num 517 */ 518 pitem *item; 519 hm_fragment *frag; 520 int al; 521 522 *ok = 0; 523 item = pqueue_peek(D1I(s)->buffered_messages); 524 if (item == NULL) 525 return 0; 526 527 frag = (hm_fragment *)item->data; 528 529 /* Don't return if reassembly still in progress */ 530 if (frag->reassembly != NULL) 531 return 0; 532 533 if (D1I(s)->handshake_read_seq == frag->msg_header.seq) { 534 unsigned long frag_len = frag->msg_header.frag_len; 535 pqueue_pop(D1I(s)->buffered_messages); 536 537 al = dtls1_preprocess_fragment(s, &frag->msg_header, max); 538 539 if (al == 0) /* no alert */ 540 { 541 unsigned char *p = (unsigned char *)s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH; 542 memcpy(&p[frag->msg_header.frag_off], 543 frag->fragment, frag->msg_header.frag_len); 544 } 545 546 dtls1_hm_fragment_free(frag); 547 pitem_free(item); 548 549 if (al == 0) { 550 *ok = 1; 551 return frag_len; 552 } 553 554 ssl3_send_alert(s, SSL3_AL_FATAL, al); 555 s->internal->init_num = 0; 556 *ok = 0; 557 return -1; 558 } else 559 return 0; 560 } 561 562 /* 563 * dtls1_max_handshake_message_len returns the maximum number of bytes 564 * permitted in a DTLS handshake message for |s|. The minimum is 16KB, 565 * but may be greater if the maximum certificate list size requires it. 566 */ 567 static unsigned long 568 dtls1_max_handshake_message_len(const SSL *s) 569 { 570 unsigned long max_len; 571 572 max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH; 573 if (max_len < (unsigned long)s->internal->max_cert_list) 574 return s->internal->max_cert_list; 575 return max_len; 576 } 577 578 static int 579 dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok) 580 { 581 hm_fragment *frag = NULL; 582 pitem *item = NULL; 583 int i = -1, is_complete; 584 unsigned char seq64be[8]; 585 unsigned long frag_len = msg_hdr->frag_len; 586 587 if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len || 588 msg_hdr->msg_len > dtls1_max_handshake_message_len(s)) 589 goto err; 590 591 if (frag_len == 0) { 592 i = DTLS1_HM_FRAGMENT_RETRY; 593 goto err; 594 } 595 596 /* Try to find item in queue */ 597 memset(seq64be, 0, sizeof(seq64be)); 598 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8); 599 seq64be[7] = (unsigned char)msg_hdr->seq; 600 item = pqueue_find(D1I(s)->buffered_messages, seq64be); 601 602 if (item == NULL) { 603 frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1); 604 if (frag == NULL) 605 goto err; 606 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); 607 frag->msg_header.frag_len = frag->msg_header.msg_len; 608 frag->msg_header.frag_off = 0; 609 } else { 610 frag = (hm_fragment*)item->data; 611 if (frag->msg_header.msg_len != msg_hdr->msg_len) { 612 item = NULL; 613 frag = NULL; 614 goto err; 615 } 616 } 617 618 /* 619 * If message is already reassembled, this must be a 620 * retransmit and can be dropped. 621 */ 622 if (frag->reassembly == NULL) { 623 unsigned char devnull [256]; 624 625 while (frag_len) { 626 i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, 627 devnull, frag_len > sizeof(devnull) ? 628 sizeof(devnull) : frag_len, 0); 629 if (i <= 0) 630 goto err; 631 frag_len -= i; 632 } 633 i = DTLS1_HM_FRAGMENT_RETRY; 634 goto err; 635 } 636 637 /* read the body of the fragment (header has already been read */ 638 i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, 639 frag->fragment + msg_hdr->frag_off, frag_len, 0); 640 if (i <= 0 || (unsigned long)i != frag_len) 641 goto err; 642 643 RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off, 644 (long)(msg_hdr->frag_off + frag_len)); 645 646 RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len, 647 is_complete); 648 649 if (is_complete) { 650 free(frag->reassembly); 651 frag->reassembly = NULL; 652 } 653 654 if (item == NULL) { 655 memset(seq64be, 0, sizeof(seq64be)); 656 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8); 657 seq64be[7] = (unsigned char)(msg_hdr->seq); 658 659 item = pitem_new(seq64be, frag); 660 if (item == NULL) { 661 i = -1; 662 goto err; 663 } 664 665 pqueue_insert(D1I(s)->buffered_messages, item); 666 } 667 668 return DTLS1_HM_FRAGMENT_RETRY; 669 670 err: 671 if (item == NULL && frag != NULL) 672 dtls1_hm_fragment_free(frag); 673 *ok = 0; 674 return i; 675 } 676 677 678 static int 679 dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok) 680 { 681 int i = -1; 682 hm_fragment *frag = NULL; 683 pitem *item = NULL; 684 unsigned char seq64be[8]; 685 unsigned long frag_len = msg_hdr->frag_len; 686 687 if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len) 688 goto err; 689 690 /* Try to find item in queue, to prevent duplicate entries */ 691 memset(seq64be, 0, sizeof(seq64be)); 692 seq64be[6] = (unsigned char) (msg_hdr->seq >> 8); 693 seq64be[7] = (unsigned char) msg_hdr->seq; 694 item = pqueue_find(D1I(s)->buffered_messages, seq64be); 695 696 /* 697 * If we already have an entry and this one is a fragment, 698 * don't discard it and rather try to reassemble it. 699 */ 700 if (item != NULL && frag_len < msg_hdr->msg_len) 701 item = NULL; 702 703 /* 704 * Discard the message if sequence number was already there, is 705 * too far in the future, already in the queue or if we received 706 * a FINISHED before the SERVER_HELLO, which then must be a stale 707 * retransmit. 708 */ 709 if (msg_hdr->seq <= D1I(s)->handshake_read_seq || 710 msg_hdr->seq > D1I(s)->handshake_read_seq + 10 || item != NULL || 711 (D1I(s)->handshake_read_seq == 0 && 712 msg_hdr->type == SSL3_MT_FINISHED)) { 713 unsigned char devnull [256]; 714 715 while (frag_len) { 716 i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, 717 devnull, frag_len > sizeof(devnull) ? 718 sizeof(devnull) : frag_len, 0); 719 if (i <= 0) 720 goto err; 721 frag_len -= i; 722 } 723 } else { 724 if (frag_len < msg_hdr->msg_len) 725 return dtls1_reassemble_fragment(s, msg_hdr, ok); 726 727 if (frag_len > dtls1_max_handshake_message_len(s)) 728 goto err; 729 730 frag = dtls1_hm_fragment_new(frag_len, 0); 731 if (frag == NULL) 732 goto err; 733 734 memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); 735 736 if (frag_len) { 737 /* read the body of the fragment (header has already been read */ 738 i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, 739 frag->fragment, frag_len, 0); 740 if (i <= 0 || (unsigned long)i != frag_len) 741 goto err; 742 } 743 744 memset(seq64be, 0, sizeof(seq64be)); 745 seq64be[6] = (unsigned char)(msg_hdr->seq >> 8); 746 seq64be[7] = (unsigned char)(msg_hdr->seq); 747 748 item = pitem_new(seq64be, frag); 749 if (item == NULL) 750 goto err; 751 752 pqueue_insert(D1I(s)->buffered_messages, item); 753 } 754 755 return DTLS1_HM_FRAGMENT_RETRY; 756 757 err: 758 if (item == NULL && frag != NULL) 759 dtls1_hm_fragment_free(frag); 760 *ok = 0; 761 return i; 762 } 763 764 765 static long 766 dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok) 767 { 768 unsigned char wire[DTLS1_HM_HEADER_LENGTH]; 769 unsigned long len, frag_off, frag_len; 770 int i, al; 771 struct hm_header_st msg_hdr; 772 773 again: 774 /* see if we have the required fragment already */ 775 if ((frag_len = dtls1_retrieve_buffered_fragment(s, max, ok)) || *ok) { 776 if (*ok) 777 s->internal->init_num = frag_len; 778 return frag_len; 779 } 780 781 /* read handshake message header */ 782 i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, wire, 783 DTLS1_HM_HEADER_LENGTH, 0); 784 if (i <= 0) /* nbio, or an error */ 785 { 786 s->internal->rwstate = SSL_READING; 787 *ok = 0; 788 return i; 789 } 790 /* Handshake fails if message header is incomplete */ 791 if (i != DTLS1_HM_HEADER_LENGTH || 792 /* parse the message fragment header */ 793 dtls1_get_message_header(wire, &msg_hdr) == 0) { 794 al = SSL_AD_UNEXPECTED_MESSAGE; 795 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 796 goto f_err; 797 } 798 799 /* 800 * if this is a future (or stale) message it gets buffered 801 * (or dropped)--no further processing at this time 802 * While listening, we accept seq 1 (ClientHello with cookie) 803 * although we're still expecting seq 0 (ClientHello) 804 */ 805 if (msg_hdr.seq != D1I(s)->handshake_read_seq && 806 !(D1I(s)->listen && msg_hdr.seq == 1)) 807 return dtls1_process_out_of_seq_message(s, &msg_hdr, ok); 808 809 len = msg_hdr.msg_len; 810 frag_off = msg_hdr.frag_off; 811 frag_len = msg_hdr.frag_len; 812 813 if (frag_len && frag_len < len) 814 return dtls1_reassemble_fragment(s, &msg_hdr, ok); 815 816 if (!s->server && D1I(s)->r_msg_hdr.frag_off == 0 && 817 wire[0] == SSL3_MT_HELLO_REQUEST) { 818 /* 819 * The server may always send 'Hello Request' messages -- 820 * we are doing a handshake anyway now, so ignore them 821 * if their format is correct. Does not count for 822 * 'Finished' MAC. 823 */ 824 if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) { 825 if (s->internal->msg_callback) 826 s->internal->msg_callback(0, s->version, 827 SSL3_RT_HANDSHAKE, wire, 828 DTLS1_HM_HEADER_LENGTH, s, 829 s->internal->msg_callback_arg); 830 831 s->internal->init_num = 0; 832 goto again; 833 } 834 else /* Incorrectly formated Hello request */ 835 { 836 al = SSL_AD_UNEXPECTED_MESSAGE; 837 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 838 goto f_err; 839 } 840 } 841 842 if ((al = dtls1_preprocess_fragment(s, &msg_hdr, max))) 843 goto f_err; 844 845 /* XDTLS: ressurect this when restart is in place */ 846 S3I(s)->hs.state = stn; 847 848 if (frag_len > 0) { 849 unsigned char *p = (unsigned char *)s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH; 850 851 i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, 852 &p[frag_off], frag_len, 0); 853 /* XDTLS: fix this--message fragments cannot span multiple packets */ 854 if (i <= 0) { 855 s->internal->rwstate = SSL_READING; 856 *ok = 0; 857 return i; 858 } 859 } else 860 i = 0; 861 862 /* 863 * XDTLS: an incorrectly formatted fragment should cause the 864 * handshake to fail 865 */ 866 if (i != (int)frag_len) { 867 al = SSL3_AD_ILLEGAL_PARAMETER; 868 SSLerror(s, SSL3_AD_ILLEGAL_PARAMETER); 869 goto f_err; 870 } 871 872 *ok = 1; 873 874 /* 875 * Note that s->internal->init_num is *not* used as current offset in 876 * s->internal->init_buf->data, but as a counter summing up fragments' 877 * lengths: as soon as they sum up to handshake packet 878 * length, we assume we have got all the fragments. 879 */ 880 s->internal->init_num = frag_len; 881 return frag_len; 882 883 f_err: 884 ssl3_send_alert(s, SSL3_AL_FATAL, al); 885 s->internal->init_num = 0; 886 887 *ok = 0; 888 return (-1); 889 } 890 891 int 892 dtls1_read_failed(SSL *s, int code) 893 { 894 if (code > 0) { 895 #ifdef DEBUG 896 fprintf(stderr, "invalid state reached %s:%d", 897 __FILE__, __LINE__); 898 #endif 899 return 1; 900 } 901 902 if (!dtls1_is_timer_expired(s)) { 903 /* 904 * not a timeout, none of our business, let higher layers 905 * handle this. in fact it's probably an error 906 */ 907 return code; 908 } 909 910 if (!SSL_in_init(s)) /* done, no need to send a retransmit */ 911 { 912 BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ); 913 return code; 914 } 915 916 return dtls1_handle_timeout(s); 917 } 918 919 int 920 dtls1_get_queue_priority(unsigned short seq, int is_ccs) 921 { 922 /* 923 * The index of the retransmission queue actually is the message 924 * sequence number, since the queue only contains messages of a 925 * single handshake. However, the ChangeCipherSpec has no message 926 * sequence number and so using only the sequence will result in 927 * the CCS and Finished having the same index. To prevent this, the 928 * sequence number is multiplied by 2. In case of a CCS 1 is 929 * subtracted. This does not only differ CSS and Finished, it also 930 * maintains the order of the index (important for priority queues) 931 * and fits in the unsigned short variable. 932 */ 933 return seq * 2 - is_ccs; 934 } 935 936 int 937 dtls1_retransmit_buffered_messages(SSL *s) 938 { 939 pqueue sent = s->d1->sent_messages; 940 piterator iter; 941 pitem *item; 942 hm_fragment *frag; 943 int found = 0; 944 945 iter = pqueue_iterator(sent); 946 947 for (item = pqueue_next(&iter); item != NULL; 948 item = pqueue_next(&iter)) { 949 frag = (hm_fragment *)item->data; 950 if (dtls1_retransmit_message(s, 951 (unsigned short)dtls1_get_queue_priority( 952 frag->msg_header.seq, frag->msg_header.is_ccs), 0, 953 &found) <= 0 && found) { 954 #ifdef DEBUG 955 fprintf(stderr, "dtls1_retransmit_message() failed\n"); 956 #endif 957 return -1; 958 } 959 } 960 961 return 1; 962 } 963 964 int 965 dtls1_buffer_message(SSL *s, int is_ccs) 966 { 967 pitem *item; 968 hm_fragment *frag; 969 unsigned char seq64be[8]; 970 971 /* Buffer the messsage in order to handle DTLS retransmissions. */ 972 973 /* 974 * This function is called immediately after a message has 975 * been serialized 976 */ 977 OPENSSL_assert(s->internal->init_off == 0); 978 979 frag = dtls1_hm_fragment_new(s->internal->init_num, 0); 980 if (frag == NULL) 981 return 0; 982 983 memcpy(frag->fragment, s->internal->init_buf->data, s->internal->init_num); 984 985 if (is_ccs) { 986 OPENSSL_assert(D1I(s)->w_msg_hdr.msg_len + 987 ((s->version == DTLS1_VERSION) ? 988 DTLS1_CCS_HEADER_LENGTH : 3) == (unsigned int)s->internal->init_num); 989 } else { 990 OPENSSL_assert(D1I(s)->w_msg_hdr.msg_len + 991 DTLS1_HM_HEADER_LENGTH == (unsigned int)s->internal->init_num); 992 } 993 994 frag->msg_header.msg_len = D1I(s)->w_msg_hdr.msg_len; 995 frag->msg_header.seq = D1I(s)->w_msg_hdr.seq; 996 frag->msg_header.type = D1I(s)->w_msg_hdr.type; 997 frag->msg_header.frag_off = 0; 998 frag->msg_header.frag_len = D1I(s)->w_msg_hdr.msg_len; 999 frag->msg_header.is_ccs = is_ccs; 1000 1001 /* save current state*/ 1002 frag->msg_header.saved_retransmit_state.enc_write_ctx = s->internal->enc_write_ctx; 1003 frag->msg_header.saved_retransmit_state.write_hash = s->internal->write_hash; 1004 frag->msg_header.saved_retransmit_state.session = s->session; 1005 frag->msg_header.saved_retransmit_state.epoch = D1I(s)->w_epoch; 1006 1007 memset(seq64be, 0, sizeof(seq64be)); 1008 seq64be[6] = (unsigned char)(dtls1_get_queue_priority( 1009 frag->msg_header.seq, frag->msg_header.is_ccs) >> 8); 1010 seq64be[7] = (unsigned char)(dtls1_get_queue_priority( 1011 frag->msg_header.seq, frag->msg_header.is_ccs)); 1012 1013 item = pitem_new(seq64be, frag); 1014 if (item == NULL) { 1015 dtls1_hm_fragment_free(frag); 1016 return 0; 1017 } 1018 1019 pqueue_insert(s->d1->sent_messages, item); 1020 return 1; 1021 } 1022 1023 int 1024 dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off, 1025 int *found) 1026 { 1027 int ret; 1028 /* XDTLS: for now assuming that read/writes are blocking */ 1029 pitem *item; 1030 hm_fragment *frag; 1031 unsigned long header_length; 1032 unsigned char seq64be[8]; 1033 struct dtls1_retransmit_state saved_state; 1034 unsigned char save_write_sequence[8]; 1035 1036 /* 1037 OPENSSL_assert(s->internal->init_num == 0); 1038 OPENSSL_assert(s->internal->init_off == 0); 1039 */ 1040 1041 /* XDTLS: the requested message ought to be found, otherwise error */ 1042 memset(seq64be, 0, sizeof(seq64be)); 1043 seq64be[6] = (unsigned char)(seq >> 8); 1044 seq64be[7] = (unsigned char)seq; 1045 1046 item = pqueue_find(s->d1->sent_messages, seq64be); 1047 if (item == NULL) { 1048 #ifdef DEBUG 1049 fprintf(stderr, "retransmit: message %d non-existent\n", seq); 1050 #endif 1051 *found = 0; 1052 return 0; 1053 } 1054 1055 *found = 1; 1056 frag = (hm_fragment *)item->data; 1057 1058 if (frag->msg_header.is_ccs) 1059 header_length = DTLS1_CCS_HEADER_LENGTH; 1060 else 1061 header_length = DTLS1_HM_HEADER_LENGTH; 1062 1063 memcpy(s->internal->init_buf->data, frag->fragment, 1064 frag->msg_header.msg_len + header_length); 1065 s->internal->init_num = frag->msg_header.msg_len + header_length; 1066 1067 dtls1_set_message_header_int(s, frag->msg_header.type, 1068 frag->msg_header.msg_len, frag->msg_header.seq, 0, 1069 frag->msg_header.frag_len); 1070 1071 /* save current state */ 1072 saved_state.enc_write_ctx = s->internal->enc_write_ctx; 1073 saved_state.write_hash = s->internal->write_hash; 1074 saved_state.session = s->session; 1075 saved_state.epoch = D1I(s)->w_epoch; 1076 1077 D1I(s)->retransmitting = 1; 1078 1079 /* restore state in which the message was originally sent */ 1080 s->internal->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx; 1081 s->internal->write_hash = frag->msg_header.saved_retransmit_state.write_hash; 1082 s->session = frag->msg_header.saved_retransmit_state.session; 1083 D1I(s)->w_epoch = frag->msg_header.saved_retransmit_state.epoch; 1084 1085 if (frag->msg_header.saved_retransmit_state.epoch == 1086 saved_state.epoch - 1) { 1087 memcpy(save_write_sequence, S3I(s)->write_sequence, 1088 sizeof(S3I(s)->write_sequence)); 1089 memcpy(S3I(s)->write_sequence, D1I(s)->last_write_sequence, 1090 sizeof(S3I(s)->write_sequence)); 1091 } 1092 1093 ret = dtls1_do_write(s, frag->msg_header.is_ccs ? 1094 SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE); 1095 1096 /* restore current state */ 1097 s->internal->enc_write_ctx = saved_state.enc_write_ctx; 1098 s->internal->write_hash = saved_state.write_hash; 1099 s->session = saved_state.session; 1100 D1I(s)->w_epoch = saved_state.epoch; 1101 1102 if (frag->msg_header.saved_retransmit_state.epoch == 1103 saved_state.epoch - 1) { 1104 memcpy(D1I(s)->last_write_sequence, S3I(s)->write_sequence, 1105 sizeof(S3I(s)->write_sequence)); 1106 memcpy(S3I(s)->write_sequence, save_write_sequence, 1107 sizeof(S3I(s)->write_sequence)); 1108 } 1109 1110 D1I(s)->retransmitting = 0; 1111 1112 (void)BIO_flush(SSL_get_wbio(s)); 1113 return ret; 1114 } 1115 1116 /* call this function when the buffered messages are no longer needed */ 1117 void 1118 dtls1_clear_record_buffer(SSL *s) 1119 { 1120 pitem *item; 1121 1122 for(item = pqueue_pop(s->d1->sent_messages); item != NULL; 1123 item = pqueue_pop(s->d1->sent_messages)) { 1124 dtls1_hm_fragment_free((hm_fragment *)item->data); 1125 pitem_free(item); 1126 } 1127 } 1128 1129 void 1130 dtls1_set_message_header(SSL *s, unsigned char mt, unsigned long len, 1131 unsigned long frag_off, unsigned long frag_len) 1132 { 1133 /* Don't change sequence numbers while listening */ 1134 if (frag_off == 0 && !D1I(s)->listen) { 1135 D1I(s)->handshake_write_seq = D1I(s)->next_handshake_write_seq; 1136 D1I(s)->next_handshake_write_seq++; 1137 } 1138 1139 dtls1_set_message_header_int(s, mt, len, D1I(s)->handshake_write_seq, 1140 frag_off, frag_len); 1141 } 1142 1143 /* don't actually do the writing, wait till the MTU has been retrieved */ 1144 void 1145 dtls1_set_message_header_int(SSL *s, unsigned char mt, unsigned long len, 1146 unsigned short seq_num, unsigned long frag_off, unsigned long frag_len) 1147 { 1148 struct hm_header_st *msg_hdr = &D1I(s)->w_msg_hdr; 1149 1150 msg_hdr->type = mt; 1151 msg_hdr->msg_len = len; 1152 msg_hdr->seq = seq_num; 1153 msg_hdr->frag_off = frag_off; 1154 msg_hdr->frag_len = frag_len; 1155 } 1156 1157 static void 1158 dtls1_fix_message_header(SSL *s, unsigned long frag_off, unsigned long frag_len) 1159 { 1160 struct hm_header_st *msg_hdr = &D1I(s)->w_msg_hdr; 1161 1162 msg_hdr->frag_off = frag_off; 1163 msg_hdr->frag_len = frag_len; 1164 } 1165 1166 static int 1167 dtls1_write_message_header(const struct hm_header_st *msg_hdr, 1168 unsigned long frag_off, unsigned long frag_len, unsigned char *p) 1169 { 1170 CBB cbb; 1171 1172 /* We assume DTLS1_HM_HEADER_LENGTH bytes are available for now... */ 1173 if (!CBB_init_fixed(&cbb, p, DTLS1_HM_HEADER_LENGTH)) 1174 return 0; 1175 if (!CBB_add_u8(&cbb, msg_hdr->type)) 1176 goto err; 1177 if (!CBB_add_u24(&cbb, msg_hdr->msg_len)) 1178 goto err; 1179 if (!CBB_add_u16(&cbb, msg_hdr->seq)) 1180 goto err; 1181 if (!CBB_add_u24(&cbb, frag_off)) 1182 goto err; 1183 if (!CBB_add_u24(&cbb, frag_len)) 1184 goto err; 1185 if (!CBB_finish(&cbb, NULL, NULL)) 1186 goto err; 1187 1188 return 1; 1189 1190 err: 1191 CBB_cleanup(&cbb); 1192 return 0; 1193 } 1194 1195 unsigned int 1196 dtls1_min_mtu(void) 1197 { 1198 return (g_probable_mtu[(sizeof(g_probable_mtu) / 1199 sizeof(g_probable_mtu[0])) - 1]); 1200 } 1201 1202 static unsigned int 1203 dtls1_guess_mtu(unsigned int curr_mtu) 1204 { 1205 unsigned int i; 1206 1207 if (curr_mtu == 0) 1208 return g_probable_mtu[0]; 1209 1210 for (i = 0; i < sizeof(g_probable_mtu) / sizeof(g_probable_mtu[0]); i++) 1211 if (curr_mtu > g_probable_mtu[i]) 1212 return g_probable_mtu[i]; 1213 1214 return curr_mtu; 1215 } 1216 1217 int 1218 dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr) 1219 { 1220 CBS header; 1221 uint32_t msg_len, frag_off, frag_len; 1222 uint16_t seq; 1223 uint8_t type; 1224 1225 CBS_init(&header, data, sizeof(*msg_hdr)); 1226 1227 memset(msg_hdr, 0, sizeof(*msg_hdr)); 1228 1229 if (!CBS_get_u8(&header, &type)) 1230 return 0; 1231 if (!CBS_get_u24(&header, &msg_len)) 1232 return 0; 1233 if (!CBS_get_u16(&header, &seq)) 1234 return 0; 1235 if (!CBS_get_u24(&header, &frag_off)) 1236 return 0; 1237 if (!CBS_get_u24(&header, &frag_len)) 1238 return 0; 1239 1240 msg_hdr->type = type; 1241 msg_hdr->msg_len = msg_len; 1242 msg_hdr->seq = seq; 1243 msg_hdr->frag_off = frag_off; 1244 msg_hdr->frag_len = frag_len; 1245 1246 return 1; 1247 } 1248 1249 void 1250 dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr) 1251 { 1252 memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st)); 1253 1254 ccs_hdr->type = *(data++); 1255 } 1256