Branch data Line data Source code
1 : : /* ssl/d1_both.c */
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 <string.h>
118 : : #include <stdio.h>
119 : : #include "ssl_locl.h"
120 : : #include <openssl/buffer.h>
121 : : #include <openssl/rand.h>
122 : : #include <openssl/objects.h>
123 : : #include <openssl/evp.h>
124 : : #include <openssl/x509.h>
125 : :
126 : : #define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8)
127 : :
128 : : #define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
129 : : if ((end) - (start) <= 8) { \
130 : : long ii; \
131 : : for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
132 : : } else { \
133 : : long ii; \
134 : : bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \
135 : : for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \
136 : : bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \
137 : : } }
138 : :
139 : : #define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \
140 : : long ii; \
141 : : OPENSSL_assert((msg_len) > 0); \
142 : : is_complete = 1; \
143 : : if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \
144 : : if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \
145 : : if (bitmask[ii] != 0xff) { is_complete = 0; break; } }
146 : :
147 : : #if 0
148 : : #define RSMBLY_BITMASK_PRINT(bitmask, msg_len) { \
149 : : long ii; \
150 : : printf("bitmask: "); for (ii = 0; ii < (msg_len); ii++) \
151 : : printf("%d ", (bitmask[ii >> 3] & (1 << (ii & 7))) >> (ii & 7)); \
152 : : printf("\n"); }
153 : : #endif
154 : :
155 : : static unsigned char bitmask_start_values[] = {0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80};
156 : : static unsigned char bitmask_end_values[] = {0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f};
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 unsigned char *dtls1_write_message_header(SSL *s,
165 : : unsigned char *p);
166 : : static void dtls1_set_message_header_int(SSL *s, unsigned char mt,
167 : : unsigned long len, unsigned short seq_num, unsigned long frag_off,
168 : : unsigned long frag_len);
169 : : static long dtls1_get_message_fragment(SSL *s, int st1, int stn,
170 : : long max, int *ok);
171 : :
172 : : static hm_fragment *
173 : 0 : dtls1_hm_fragment_new(unsigned long frag_len, int reassembly)
174 : : {
175 : 0 : hm_fragment *frag = NULL;
176 : 0 : unsigned char *buf = NULL;
177 : 0 : unsigned char *bitmask = NULL;
178 : :
179 : 0 : frag = (hm_fragment *)OPENSSL_malloc(sizeof(hm_fragment));
180 [ # # ]: 0 : if ( frag == NULL)
181 : : return NULL;
182 : :
183 [ # # ]: 0 : if (frag_len)
184 : : {
185 : 0 : buf = (unsigned char *)OPENSSL_malloc(frag_len);
186 [ # # ]: 0 : if ( buf == NULL)
187 : : {
188 : 0 : OPENSSL_free(frag);
189 : 0 : return NULL;
190 : : }
191 : : }
192 : :
193 : : /* zero length fragment gets zero frag->fragment */
194 : 0 : frag->fragment = buf;
195 : :
196 : : /* Initialize reassembly bitmask if necessary */
197 [ # # ]: 0 : if (reassembly)
198 : : {
199 : 0 : bitmask = (unsigned char *)OPENSSL_malloc(RSMBLY_BITMASK_SIZE(frag_len));
200 [ # # ]: 0 : if (bitmask == NULL)
201 : : {
202 [ # # ]: 0 : if (buf != NULL) OPENSSL_free(buf);
203 : 0 : OPENSSL_free(frag);
204 : 0 : return NULL;
205 : : }
206 : 0 : memset(bitmask, 0, RSMBLY_BITMASK_SIZE(frag_len));
207 : : }
208 : :
209 : 0 : frag->reassembly = bitmask;
210 : :
211 : 0 : return frag;
212 : : }
213 : :
214 : : static void
215 : 0 : dtls1_hm_fragment_free(hm_fragment *frag)
216 : : {
217 : :
218 [ # # ]: 0 : if (frag->msg_header.is_ccs)
219 : : {
220 : 0 : EVP_CIPHER_CTX_free(frag->msg_header.saved_retransmit_state.enc_write_ctx);
221 : 0 : EVP_MD_CTX_destroy(frag->msg_header.saved_retransmit_state.write_hash);
222 : : }
223 [ # # ]: 0 : if (frag->fragment) OPENSSL_free(frag->fragment);
224 [ # # ]: 0 : if (frag->reassembly) OPENSSL_free(frag->reassembly);
225 : 0 : OPENSSL_free(frag);
226 : 0 : }
227 : :
228 : : /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
229 : 0 : int dtls1_do_write(SSL *s, int type)
230 : : {
231 : : int ret;
232 : : int curr_mtu;
233 : : unsigned int len, frag_off, mac_size, blocksize;
234 : :
235 : : /* AHA! Figure out the MTU, and stick to the right size */
236 [ # # ][ # # ]: 0 : if (s->d1->mtu < dtls1_min_mtu() && !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU))
237 : : {
238 : 0 : s->d1->mtu =
239 : 0 : BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
240 : :
241 : : /* I've seen the kernel return bogus numbers when it doesn't know
242 : : * (initial write), so just make sure we have a reasonable number */
243 [ # # ]: 0 : if (s->d1->mtu < dtls1_min_mtu())
244 : : {
245 : 0 : s->d1->mtu = 0;
246 : 0 : s->d1->mtu = dtls1_guess_mtu(s->d1->mtu);
247 : 0 : BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
248 : : s->d1->mtu, NULL);
249 : : }
250 : : }
251 : : #if 0
252 : : mtu = s->d1->mtu;
253 : :
254 : : fprintf(stderr, "using MTU = %d\n", mtu);
255 : :
256 : : mtu -= (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH);
257 : :
258 : : curr_mtu = mtu - BIO_wpending(SSL_get_wbio(s));
259 : :
260 : : if ( curr_mtu > 0)
261 : : mtu = curr_mtu;
262 : : else if ( ( ret = BIO_flush(SSL_get_wbio(s))) <= 0)
263 : : return ret;
264 : :
265 : : if ( BIO_wpending(SSL_get_wbio(s)) + s->init_num >= mtu)
266 : : {
267 : : ret = BIO_flush(SSL_get_wbio(s));
268 : : if ( ret <= 0)
269 : : return ret;
270 : : mtu = s->d1->mtu - (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH);
271 : : }
272 : : #endif
273 : :
274 [ # # ]: 0 : OPENSSL_assert(s->d1->mtu >= dtls1_min_mtu()); /* should have something reasonable now */
275 : :
276 [ # # ][ # # ]: 0 : if ( s->init_off == 0 && type == SSL3_RT_HANDSHAKE)
277 [ # # ]: 0 : OPENSSL_assert(s->init_num ==
278 : : (int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH);
279 : :
280 [ # # ]: 0 : if (s->write_hash)
281 : : {
282 [ # # ][ # # ]: 0 : if (s->enc_write_ctx && EVP_CIPHER_CTX_mode(s->enc_write_ctx) == EVP_CIPH_GCM_MODE)
283 : : mac_size = 0;
284 : : else
285 : 0 : mac_size = EVP_MD_CTX_size(s->write_hash);
286 : : }
287 : : else
288 : : mac_size = 0;
289 : :
290 [ # # # # ]: 0 : if (s->enc_write_ctx &&
291 : 0 : (EVP_CIPHER_CTX_mode(s->enc_write_ctx) == EVP_CIPH_CBC_MODE))
292 : 0 : blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
293 : : else
294 : : blocksize = 0;
295 : :
296 : 0 : frag_off = 0;
297 [ # # ]: 0 : while( s->init_num)
298 : : {
299 : 0 : curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) -
300 : 0 : DTLS1_RT_HEADER_LENGTH - mac_size - blocksize;
301 : :
302 [ # # ]: 0 : if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH)
303 : : {
304 : : /* grr.. we could get an error if MTU picked was wrong */
305 : 0 : ret = BIO_flush(SSL_get_wbio(s));
306 [ # # ]: 0 : if ( ret <= 0)
307 : : return ret;
308 : 0 : curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH -
309 : 0 : mac_size - blocksize;
310 : : }
311 : :
312 [ # # ]: 0 : if ( s->init_num > curr_mtu)
313 : 0 : len = curr_mtu;
314 : : else
315 : 0 : len = s->init_num;
316 : :
317 : :
318 : : /* XDTLS: this function is too long. split out the CCS part */
319 [ # # ]: 0 : if ( type == SSL3_RT_HANDSHAKE)
320 : : {
321 [ # # ]: 0 : if ( s->init_off != 0)
322 : : {
323 [ # # ]: 0 : OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH);
324 : 0 : s->init_off -= DTLS1_HM_HEADER_LENGTH;
325 : 0 : s->init_num += DTLS1_HM_HEADER_LENGTH;
326 : :
327 [ # # ]: 0 : if ( s->init_num > curr_mtu)
328 : 0 : len = curr_mtu;
329 : : else
330 : 0 : len = s->init_num;
331 : : }
332 : :
333 : 0 : dtls1_fix_message_header(s, frag_off,
334 : 0 : len - DTLS1_HM_HEADER_LENGTH);
335 : :
336 : 0 : dtls1_write_message_header(s, (unsigned char *)&s->init_buf->data[s->init_off]);
337 : :
338 [ # # ]: 0 : OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH);
339 : : }
340 : :
341 : 0 : ret=dtls1_write_bytes(s,type,&s->init_buf->data[s->init_off],
342 : : len);
343 [ # # ]: 0 : if (ret < 0)
344 : : {
345 : : /* might need to update MTU here, but we don't know
346 : : * which previous packet caused the failure -- so can't
347 : : * really retransmit anything. continue as if everything
348 : : * is fine and wait for an alert to handle the
349 : : * retransmit
350 : : */
351 [ # # ]: 0 : if ( BIO_ctrl(SSL_get_wbio(s),
352 : : BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0 )
353 : 0 : s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
354 : : BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
355 : : else
356 : : return(-1);
357 : : }
358 : : else
359 : : {
360 : :
361 : : /* bad if this assert fails, only part of the handshake
362 : : * message got sent. but why would this happen? */
363 [ # # ]: 0 : OPENSSL_assert(len == (unsigned int)ret);
364 : :
365 [ # # ][ # # ]: 0 : if (type == SSL3_RT_HANDSHAKE && ! s->d1->retransmitting)
366 : : {
367 : : /* should not be done for 'Hello Request's, but in that case
368 : : * we'll ignore the result anyway */
369 : 0 : unsigned char *p = (unsigned char *)&s->init_buf->data[s->init_off];
370 : 0 : const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
371 : : int xlen;
372 : :
373 [ # # ][ # # ]: 0 : if (frag_off == 0 && s->version != DTLS1_BAD_VER)
374 : : {
375 : : /* reconstruct message header is if it
376 : : * is being sent in single fragment */
377 : 0 : *p++ = msg_hdr->type;
378 : 0 : l2n3(msg_hdr->msg_len,p);
379 : 0 : s2n (msg_hdr->seq,p);
380 : 0 : l2n3(0,p);
381 : 0 : l2n3(msg_hdr->msg_len,p);
382 : 0 : p -= DTLS1_HM_HEADER_LENGTH;
383 : 0 : xlen = ret;
384 : : }
385 : : else
386 : : {
387 : 0 : p += DTLS1_HM_HEADER_LENGTH;
388 : 0 : xlen = ret - DTLS1_HM_HEADER_LENGTH;
389 : : }
390 : :
391 : 0 : ssl3_finish_mac(s, p, xlen);
392 : : }
393 : :
394 [ # # ]: 0 : if (ret == s->init_num)
395 : : {
396 [ # # ]: 0 : if (s->msg_callback)
397 : 0 : s->msg_callback(1, s->version, type, s->init_buf->data,
398 : 0 : (size_t)(s->init_off + s->init_num), s,
399 : : s->msg_callback_arg);
400 : :
401 : 0 : s->init_off = 0; /* done writing this message */
402 : 0 : s->init_num = 0;
403 : :
404 : 0 : return(1);
405 : : }
406 : 0 : s->init_off+=ret;
407 : 0 : s->init_num-=ret;
408 : 0 : frag_off += (ret -= DTLS1_HM_HEADER_LENGTH);
409 : : }
410 : : }
411 : : return(0);
412 : : }
413 : :
414 : :
415 : : /* Obtain handshake message of message type 'mt' (any if mt == -1),
416 : : * maximum acceptable body length 'max'.
417 : : * Read an entire handshake message. Handshake messages arrive in
418 : : * fragments.
419 : : */
420 : 0 : long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
421 : : {
422 : : int i, al;
423 : : struct hm_header_st *msg_hdr;
424 : : unsigned char *p;
425 : : unsigned long msg_len;
426 : :
427 : : /* s3->tmp is used to store messages that are unexpected, caused
428 : : * by the absence of an optional handshake message */
429 [ # # ]: 0 : if (s->s3->tmp.reuse_message)
430 : : {
431 : 0 : s->s3->tmp.reuse_message=0;
432 [ # # ][ # # ]: 0 : if ((mt >= 0) && (s->s3->tmp.message_type != mt))
433 : : {
434 : 0 : al=SSL_AD_UNEXPECTED_MESSAGE;
435 : 0 : SSLerr(SSL_F_DTLS1_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
436 : : goto f_err;
437 : : }
438 : 0 : *ok=1;
439 : 0 : s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
440 : 0 : s->init_num = (int)s->s3->tmp.message_size;
441 : 0 : return s->init_num;
442 : : }
443 : :
444 : 0 : msg_hdr = &s->d1->r_msg_hdr;
445 : : memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
446 : :
447 : : again:
448 : 0 : i = dtls1_get_message_fragment(s, st1, stn, max, ok);
449 [ # # ]: 0 : if ( i == DTLS1_HM_BAD_FRAGMENT ||
450 : : i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */
451 : : goto again;
452 [ # # ][ # # ]: 0 : else if ( i <= 0 && !*ok)
453 : 0 : return i;
454 : :
455 : 0 : p = (unsigned char *)s->init_buf->data;
456 : 0 : msg_len = msg_hdr->msg_len;
457 : :
458 : : /* reconstruct message header */
459 : 0 : *(p++) = msg_hdr->type;
460 : 0 : l2n3(msg_len,p);
461 : 0 : s2n (msg_hdr->seq,p);
462 : 0 : l2n3(0,p);
463 : 0 : l2n3(msg_len,p);
464 [ # # ]: 0 : if (s->version != DTLS1_BAD_VER) {
465 : 0 : p -= DTLS1_HM_HEADER_LENGTH;
466 : 0 : msg_len += DTLS1_HM_HEADER_LENGTH;
467 : : }
468 : :
469 : 0 : ssl3_finish_mac(s, p, msg_len);
470 [ # # ]: 0 : if (s->msg_callback)
471 : 0 : s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
472 : : p, msg_len,
473 : : s, s->msg_callback_arg);
474 : :
475 : : memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
476 : :
477 : : /* Don't change sequence numbers while listening */
478 [ # # ]: 0 : if (!s->d1->listen)
479 : 0 : s->d1->handshake_read_seq++;
480 : :
481 : 0 : s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
482 : 0 : return s->init_num;
483 : :
484 : : f_err:
485 : 0 : ssl3_send_alert(s,SSL3_AL_FATAL,al);
486 : 0 : *ok = 0;
487 : 0 : return -1;
488 : : }
489 : :
490 : :
491 : 0 : static int dtls1_preprocess_fragment(SSL *s,struct hm_header_st *msg_hdr,int max)
492 : : {
493 : : size_t frag_off,frag_len,msg_len;
494 : :
495 : 0 : msg_len = msg_hdr->msg_len;
496 : 0 : frag_off = msg_hdr->frag_off;
497 : 0 : frag_len = msg_hdr->frag_len;
498 : :
499 : : /* sanity checking */
500 [ # # ]: 0 : if ( (frag_off+frag_len) > msg_len)
501 : : {
502 : 0 : SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
503 : 0 : return SSL_AD_ILLEGAL_PARAMETER;
504 : : }
505 : :
506 [ # # ]: 0 : if ( (frag_off+frag_len) > (unsigned long)max)
507 : : {
508 : 0 : SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
509 : 0 : return SSL_AD_ILLEGAL_PARAMETER;
510 : : }
511 : :
512 [ # # ]: 0 : if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */
513 : : {
514 : : /* msg_len is limited to 2^24, but is effectively checked
515 : : * against max above */
516 [ # # ]: 0 : if (!BUF_MEM_grow_clean(s->init_buf,msg_len+DTLS1_HM_HEADER_LENGTH))
517 : : {
518 : 0 : SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,ERR_R_BUF_LIB);
519 : 0 : return SSL_AD_INTERNAL_ERROR;
520 : : }
521 : :
522 : 0 : s->s3->tmp.message_size = msg_len;
523 : 0 : s->d1->r_msg_hdr.msg_len = msg_len;
524 : 0 : s->s3->tmp.message_type = msg_hdr->type;
525 : 0 : s->d1->r_msg_hdr.type = msg_hdr->type;
526 : 0 : s->d1->r_msg_hdr.seq = msg_hdr->seq;
527 : : }
528 [ # # ]: 0 : else if (msg_len != s->d1->r_msg_hdr.msg_len)
529 : : {
530 : : /* They must be playing with us! BTW, failure to enforce
531 : : * upper limit would open possibility for buffer overrun. */
532 : 0 : SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
533 : 0 : return SSL_AD_ILLEGAL_PARAMETER;
534 : : }
535 : :
536 : : return 0; /* no error */
537 : : }
538 : :
539 : :
540 : : static int
541 : 0 : dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
542 : : {
543 : : /* (0) check whether the desired fragment is available
544 : : * if so:
545 : : * (1) copy over the fragment to s->init_buf->data[]
546 : : * (2) update s->init_num
547 : : */
548 : : pitem *item;
549 : : hm_fragment *frag;
550 : : int al;
551 : :
552 : 0 : *ok = 0;
553 : 0 : item = pqueue_peek(s->d1->buffered_messages);
554 [ # # ]: 0 : if ( item == NULL)
555 : : return 0;
556 : :
557 : 0 : frag = (hm_fragment *)item->data;
558 : :
559 : : /* Don't return if reassembly still in progress */
560 [ # # ]: 0 : if (frag->reassembly != NULL)
561 : : return 0;
562 : :
563 [ # # ]: 0 : if ( s->d1->handshake_read_seq == frag->msg_header.seq)
564 : : {
565 : 0 : unsigned long frag_len = frag->msg_header.frag_len;
566 : 0 : pqueue_pop(s->d1->buffered_messages);
567 : :
568 : 0 : al=dtls1_preprocess_fragment(s,&frag->msg_header,max);
569 : :
570 [ # # ]: 0 : if (al==0) /* no alert */
571 : : {
572 : 0 : unsigned char *p = (unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH;
573 : 0 : memcpy(&p[frag->msg_header.frag_off],
574 : 0 : frag->fragment,frag->msg_header.frag_len);
575 : : }
576 : :
577 : 0 : dtls1_hm_fragment_free(frag);
578 : 0 : pitem_free(item);
579 : :
580 [ # # ]: 0 : if (al==0)
581 : : {
582 : 0 : *ok = 1;
583 : 0 : return frag_len;
584 : : }
585 : :
586 : 0 : ssl3_send_alert(s,SSL3_AL_FATAL,al);
587 : 0 : s->init_num = 0;
588 : 0 : *ok = 0;
589 : 0 : return -1;
590 : : }
591 : : else
592 : : return 0;
593 : : }
594 : :
595 : :
596 : : static int
597 : 0 : dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
598 : : {
599 : 0 : hm_fragment *frag = NULL;
600 : 0 : pitem *item = NULL;
601 : 0 : int i = -1, is_complete;
602 : : unsigned char seq64be[8];
603 : 0 : unsigned long frag_len = msg_hdr->frag_len, max_len;
604 : :
605 [ # # ]: 0 : if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len)
606 : : goto err;
607 : :
608 : : /* Determine maximum allowed message size. Depends on (user set)
609 : : * maximum certificate length, but 16k is minimum.
610 : : */
611 [ # # ]: 0 : if (DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH < s->max_cert_list)
612 : 0 : max_len = s->max_cert_list;
613 : : else
614 : : max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH;
615 : :
616 [ # # ]: 0 : if ((msg_hdr->frag_off+frag_len) > max_len)
617 : : goto err;
618 : :
619 : : /* Try to find item in queue */
620 : : memset(seq64be,0,sizeof(seq64be));
621 : 0 : seq64be[6] = (unsigned char) (msg_hdr->seq>>8);
622 : 0 : seq64be[7] = (unsigned char) msg_hdr->seq;
623 : 0 : item = pqueue_find(s->d1->buffered_messages, seq64be);
624 : :
625 [ # # ]: 0 : if (item == NULL)
626 : : {
627 : 0 : frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1);
628 [ # # ]: 0 : if ( frag == NULL)
629 : : goto err;
630 : 0 : memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
631 : 0 : frag->msg_header.frag_len = frag->msg_header.msg_len;
632 : 0 : frag->msg_header.frag_off = 0;
633 : : }
634 : : else
635 : : {
636 : 0 : frag = (hm_fragment*) item->data;
637 [ # # ]: 0 : if (frag->msg_header.msg_len != msg_hdr->msg_len)
638 : : {
639 : : item = NULL;
640 : : frag = NULL;
641 : : goto err;
642 : : }
643 : : }
644 : :
645 : :
646 : : /* If message is already reassembled, this must be a
647 : : * retransmit and can be dropped.
648 : : */
649 [ # # ]: 0 : if (frag->reassembly == NULL)
650 : : {
651 : : unsigned char devnull [256];
652 : :
653 [ # # ]: 0 : while (frag_len)
654 : : {
655 : 0 : i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
656 : : devnull,
657 : 0 : frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0);
658 [ # # ]: 0 : if (i<=0) goto err;
659 : 0 : frag_len -= i;
660 : : }
661 : 0 : return DTLS1_HM_FRAGMENT_RETRY;
662 : : }
663 : :
664 : : /* read the body of the fragment (header has already been read */
665 : 0 : i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
666 : 0 : frag->fragment + msg_hdr->frag_off,frag_len,0);
667 [ # # ][ # # ]: 0 : if (i<=0 || (unsigned long)i!=frag_len)
668 : : goto err;
669 : :
670 [ # # ][ # # ]: 0 : RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,
[ # # ]
671 : : (long)(msg_hdr->frag_off + frag_len));
672 : :
673 [ # # ][ # # ]: 0 : RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len,
[ # # ][ # # ]
[ # # ]
674 : : is_complete);
675 : :
676 [ # # ]: 0 : if (is_complete)
677 : : {
678 : 0 : OPENSSL_free(frag->reassembly);
679 : 0 : frag->reassembly = NULL;
680 : : }
681 : :
682 [ # # ]: 0 : if (item == NULL)
683 : : {
684 : : memset(seq64be,0,sizeof(seq64be));
685 : 0 : seq64be[6] = (unsigned char)(msg_hdr->seq>>8);
686 : 0 : seq64be[7] = (unsigned char)(msg_hdr->seq);
687 : :
688 : 0 : item = pitem_new(seq64be, frag);
689 [ # # ]: 0 : if (item == NULL)
690 : : {
691 : : i = -1;
692 : : goto err;
693 : : }
694 : :
695 : 0 : pqueue_insert(s->d1->buffered_messages, item);
696 : : }
697 : :
698 : : return DTLS1_HM_FRAGMENT_RETRY;
699 : :
700 : : err:
701 [ # # ]: 0 : if (frag != NULL) dtls1_hm_fragment_free(frag);
702 [ # # ]: 0 : if (item != NULL) OPENSSL_free(item);
703 : 0 : *ok = 0;
704 : 0 : return i;
705 : : }
706 : :
707 : :
708 : : static int
709 : 0 : dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
710 : : {
711 : 0 : int i=-1;
712 : 0 : hm_fragment *frag = NULL;
713 : 0 : pitem *item = NULL;
714 : : unsigned char seq64be[8];
715 : 0 : unsigned long frag_len = msg_hdr->frag_len;
716 : :
717 [ # # ]: 0 : if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len)
718 : : goto err;
719 : :
720 : : /* Try to find item in queue, to prevent duplicate entries */
721 : : memset(seq64be,0,sizeof(seq64be));
722 : 0 : seq64be[6] = (unsigned char) (msg_hdr->seq>>8);
723 : 0 : seq64be[7] = (unsigned char) msg_hdr->seq;
724 : 0 : item = pqueue_find(s->d1->buffered_messages, seq64be);
725 : :
726 : : /* If we already have an entry and this one is a fragment,
727 : : * don't discard it and rather try to reassemble it.
728 : : */
729 [ # # ][ # # ]: 0 : if (item != NULL && frag_len < msg_hdr->msg_len)
730 : 0 : item = NULL;
731 : :
732 : : /* Discard the message if sequence number was already there, is
733 : : * too far in the future, already in the queue or if we received
734 : : * a FINISHED before the SERVER_HELLO, which then must be a stale
735 : : * retransmit.
736 : : */
737 [ # # ][ # # ]: 0 : if (msg_hdr->seq <= s->d1->handshake_read_seq ||
738 [ # # ][ # # ]: 0 : msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL ||
739 [ # # ]: 0 : (s->d1->handshake_read_seq == 0 && msg_hdr->type == SSL3_MT_FINISHED))
740 : 0 : {
741 : : unsigned char devnull [256];
742 : :
743 [ # # ]: 0 : while (frag_len)
744 : : {
745 : 0 : i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
746 : : devnull,
747 : 0 : frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0);
748 [ # # ]: 0 : if (i<=0) goto err;
749 : 0 : frag_len -= i;
750 : : }
751 : : }
752 : : else
753 : : {
754 [ # # ][ # # ]: 0 : if (frag_len && frag_len < msg_hdr->msg_len)
755 : 0 : return dtls1_reassemble_fragment(s, msg_hdr, ok);
756 : :
757 : 0 : frag = dtls1_hm_fragment_new(frag_len, 0);
758 [ # # ]: 0 : if ( frag == NULL)
759 : : goto err;
760 : :
761 : 0 : memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
762 : :
763 [ # # ]: 0 : if (frag_len)
764 : : {
765 : : /* read the body of the fragment (header has already been read */
766 : 0 : i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
767 : : frag->fragment,frag_len,0);
768 [ # # ][ # # ]: 0 : if (i<=0 || (unsigned long)i!=frag_len)
769 : : goto err;
770 : : }
771 : :
772 : : memset(seq64be,0,sizeof(seq64be));
773 : 0 : seq64be[6] = (unsigned char)(msg_hdr->seq>>8);
774 : 0 : seq64be[7] = (unsigned char)(msg_hdr->seq);
775 : :
776 : 0 : item = pitem_new(seq64be, frag);
777 [ # # ]: 0 : if ( item == NULL)
778 : : goto err;
779 : :
780 : 0 : pqueue_insert(s->d1->buffered_messages, item);
781 : : }
782 : :
783 : : return DTLS1_HM_FRAGMENT_RETRY;
784 : :
785 : : err:
786 [ # # ]: 0 : if ( frag != NULL) dtls1_hm_fragment_free(frag);
787 [ # # ]: 0 : if ( item != NULL) OPENSSL_free(item);
788 : 0 : *ok = 0;
789 : 0 : return i;
790 : : }
791 : :
792 : :
793 : : static long
794 : 0 : dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
795 : : {
796 : : unsigned char wire[DTLS1_HM_HEADER_LENGTH];
797 : : unsigned long len, frag_off, frag_len;
798 : : int i,al;
799 : : struct hm_header_st msg_hdr;
800 : :
801 : : redo:
802 : : /* see if we have the required fragment already */
803 [ # # ][ # # ]: 0 : if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok)
804 : : {
805 [ # # ]: 0 : if (*ok) s->init_num = frag_len;
806 : 0 : return frag_len;
807 : : }
808 : :
809 : : /* read handshake message header */
810 : 0 : i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,wire,
811 : : DTLS1_HM_HEADER_LENGTH, 0);
812 [ # # ]: 0 : if (i <= 0) /* nbio, or an error */
813 : : {
814 : 0 : s->rwstate=SSL_READING;
815 : 0 : *ok = 0;
816 : 0 : return i;
817 : : }
818 : : /* Handshake fails if message header is incomplete */
819 [ # # ]: 0 : if (i != DTLS1_HM_HEADER_LENGTH)
820 : : {
821 : 0 : al=SSL_AD_UNEXPECTED_MESSAGE;
822 : 0 : SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE);
823 : : goto f_err;
824 : : }
825 : :
826 : : /* parse the message fragment header */
827 : 0 : dtls1_get_message_header(wire, &msg_hdr);
828 : :
829 : : /*
830 : : * if this is a future (or stale) message it gets buffered
831 : : * (or dropped)--no further processing at this time
832 : : * While listening, we accept seq 1 (ClientHello with cookie)
833 : : * although we're still expecting seq 0 (ClientHello)
834 : : */
835 [ # # ][ # # ]: 0 : if (msg_hdr.seq != s->d1->handshake_read_seq && !(s->d1->listen && msg_hdr.seq == 1))
[ # # ]
836 : 0 : return dtls1_process_out_of_seq_message(s, &msg_hdr, ok);
837 : :
838 : 0 : len = msg_hdr.msg_len;
839 : 0 : frag_off = msg_hdr.frag_off;
840 : 0 : frag_len = msg_hdr.frag_len;
841 : :
842 [ # # ]: 0 : if (frag_len && frag_len < len)
843 : 0 : return dtls1_reassemble_fragment(s, &msg_hdr, ok);
844 : :
845 [ # # ][ # # ]: 0 : if (!s->server && s->d1->r_msg_hdr.frag_off == 0 &&
[ # # ]
846 : 0 : wire[0] == SSL3_MT_HELLO_REQUEST)
847 : : {
848 : : /* The server may always send 'Hello Request' messages --
849 : : * we are doing a handshake anyway now, so ignore them
850 : : * if their format is correct. Does not count for
851 : : * 'Finished' MAC. */
852 [ # # ][ # # ]: 0 : if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0)
[ # # ]
853 : : {
854 [ # # ]: 0 : if (s->msg_callback)
855 : 0 : s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
856 : : wire, DTLS1_HM_HEADER_LENGTH, s,
857 : : s->msg_callback_arg);
858 : :
859 : 0 : s->init_num = 0;
860 : : goto redo;
861 : : }
862 : : else /* Incorrectly formated Hello request */
863 : : {
864 : 0 : al=SSL_AD_UNEXPECTED_MESSAGE;
865 : 0 : SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE);
866 : : goto f_err;
867 : : }
868 : : }
869 : :
870 [ # # ]: 0 : if ((al=dtls1_preprocess_fragment(s,&msg_hdr,max)))
871 : : goto f_err;
872 : :
873 : : /* XDTLS: ressurect this when restart is in place */
874 : 0 : s->state=stn;
875 : :
876 [ # # ]: 0 : if ( frag_len > 0)
877 : : {
878 : 0 : unsigned char *p=(unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH;
879 : :
880 : 0 : i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
881 : : &p[frag_off],frag_len,0);
882 : : /* XDTLS: fix this--message fragments cannot span multiple packets */
883 [ # # ]: 0 : if (i <= 0)
884 : : {
885 : 0 : s->rwstate=SSL_READING;
886 : 0 : *ok = 0;
887 : 0 : return i;
888 : : }
889 : : }
890 : : else
891 : : i = 0;
892 : :
893 : : /* XDTLS: an incorrectly formatted fragment should cause the
894 : : * handshake to fail */
895 [ # # ]: 0 : if (i != (int)frag_len)
896 : : {
897 : 0 : al=SSL3_AD_ILLEGAL_PARAMETER;
898 : 0 : SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL3_AD_ILLEGAL_PARAMETER);
899 : : goto f_err;
900 : : }
901 : :
902 : 0 : *ok = 1;
903 : :
904 : : /* Note that s->init_num is *not* used as current offset in
905 : : * s->init_buf->data, but as a counter summing up fragments'
906 : : * lengths: as soon as they sum up to handshake packet
907 : : * length, we assume we have got all the fragments. */
908 : 0 : s->init_num = frag_len;
909 : 0 : return frag_len;
910 : :
911 : : f_err:
912 : 0 : ssl3_send_alert(s,SSL3_AL_FATAL,al);
913 : 0 : s->init_num = 0;
914 : :
915 : 0 : *ok=0;
916 : : return(-1);
917 : : }
918 : :
919 : : /* for these 2 messages, we need to
920 : : * ssl->enc_read_ctx re-init
921 : : * ssl->s3->read_sequence zero
922 : : * ssl->s3->read_mac_secret re-init
923 : : * ssl->session->read_sym_enc assign
924 : : * ssl->session->read_compression assign
925 : : * ssl->session->read_hash assign
926 : : */
927 : 0 : int dtls1_send_change_cipher_spec(SSL *s, int a, int b)
928 : : {
929 : : unsigned char *p;
930 : :
931 [ # # ]: 0 : if (s->state == a)
932 : : {
933 : 0 : p=(unsigned char *)s->init_buf->data;
934 : 0 : *p++=SSL3_MT_CCS;
935 : 0 : s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
936 : 0 : s->init_num=DTLS1_CCS_HEADER_LENGTH;
937 : :
938 [ # # ]: 0 : if (s->version == DTLS1_BAD_VER) {
939 : 0 : s->d1->next_handshake_write_seq++;
940 : 0 : s2n(s->d1->handshake_write_seq,p);
941 : 0 : s->init_num+=2;
942 : : }
943 : :
944 : 0 : s->init_off=0;
945 : :
946 : 0 : dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
947 : 0 : s->d1->handshake_write_seq, 0, 0);
948 : :
949 : : /* buffer the message to handle re-xmits */
950 : 0 : dtls1_buffer_message(s, 1);
951 : :
952 : 0 : s->state=b;
953 : : }
954 : :
955 : : /* SSL3_ST_CW_CHANGE_B */
956 : 0 : return(dtls1_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
957 : : }
958 : :
959 : 0 : int dtls1_read_failed(SSL *s, int code)
960 : : {
961 [ # # ]: 0 : if ( code > 0)
962 : : {
963 : 0 : fprintf( stderr, "invalid state reached %s:%d", __FILE__, __LINE__);
964 : 0 : return 1;
965 : : }
966 : :
967 [ # # ]: 0 : if (!dtls1_is_timer_expired(s))
968 : : {
969 : : /* not a timeout, none of our business,
970 : : let higher layers handle this. in fact it's probably an error */
971 : : return code;
972 : : }
973 : :
974 : : #ifndef OPENSSL_NO_HEARTBEATS
975 [ # # ][ # # ]: 0 : if (!SSL_in_init(s) && !s->tlsext_hb_pending) /* done, no need to send a retransmit */
976 : : #else
977 : : if (!SSL_in_init(s)) /* done, no need to send a retransmit */
978 : : #endif
979 : : {
980 : 0 : BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ);
981 : 0 : return code;
982 : : }
983 : :
984 : : #if 0 /* for now, each alert contains only one record number */
985 : : item = pqueue_peek(state->rcvd_records);
986 : : if ( item )
987 : : {
988 : : /* send an alert immediately for all the missing records */
989 : : }
990 : : else
991 : : #endif
992 : :
993 : : #if 0 /* no more alert sending, just retransmit the last set of messages */
994 : : if ( state->timeout.read_timeouts >= DTLS1_TMO_READ_COUNT)
995 : : ssl3_send_alert(s,SSL3_AL_WARNING,
996 : : DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
997 : : #endif
998 : :
999 : 0 : return dtls1_handle_timeout(s);
1000 : : }
1001 : :
1002 : : int
1003 : 0 : dtls1_get_queue_priority(unsigned short seq, int is_ccs)
1004 : : {
1005 : : /* The index of the retransmission queue actually is the message sequence number,
1006 : : * since the queue only contains messages of a single handshake. However, the
1007 : : * ChangeCipherSpec has no message sequence number and so using only the sequence
1008 : : * will result in the CCS and Finished having the same index. To prevent this,
1009 : : * the sequence number is multiplied by 2. In case of a CCS 1 is subtracted.
1010 : : * This does not only differ CSS and Finished, it also maintains the order of the
1011 : : * index (important for priority queues) and fits in the unsigned short variable.
1012 : : */
1013 : 0 : return seq * 2 - is_ccs;
1014 : : }
1015 : :
1016 : : int
1017 : 0 : dtls1_retransmit_buffered_messages(SSL *s)
1018 : : {
1019 : 0 : pqueue sent = s->d1->sent_messages;
1020 : : piterator iter;
1021 : : pitem *item;
1022 : : hm_fragment *frag;
1023 : 0 : int found = 0;
1024 : :
1025 : 0 : iter = pqueue_iterator(sent);
1026 : :
1027 [ # # ]: 0 : for ( item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter))
1028 : : {
1029 : 0 : frag = (hm_fragment *)item->data;
1030 [ # # ]: 0 : if ( dtls1_retransmit_message(s,
1031 : 0 : (unsigned short)dtls1_get_queue_priority(frag->msg_header.seq, frag->msg_header.is_ccs),
1032 [ # # ]: 0 : 0, &found) <= 0 && found)
1033 : : {
1034 : 0 : fprintf(stderr, "dtls1_retransmit_message() failed\n");
1035 : 0 : return -1;
1036 : : }
1037 : : }
1038 : :
1039 : : return 1;
1040 : : }
1041 : :
1042 : : int
1043 : 0 : dtls1_buffer_message(SSL *s, int is_ccs)
1044 : : {
1045 : : pitem *item;
1046 : : hm_fragment *frag;
1047 : : unsigned char seq64be[8];
1048 : :
1049 : : /* this function is called immediately after a message has
1050 : : * been serialized */
1051 [ # # ]: 0 : OPENSSL_assert(s->init_off == 0);
1052 : :
1053 : 0 : frag = dtls1_hm_fragment_new(s->init_num, 0);
1054 [ # # ]: 0 : if (!frag)
1055 : : return 0;
1056 : :
1057 : 0 : memcpy(frag->fragment, s->init_buf->data, s->init_num);
1058 : :
1059 [ # # ]: 0 : if ( is_ccs)
1060 : : {
1061 [ # # ]: 0 : OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
1062 : : DTLS1_CCS_HEADER_LENGTH == (unsigned int)s->init_num);
1063 : : }
1064 : : else
1065 : : {
1066 [ # # ]: 0 : OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
1067 : : DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num);
1068 : : }
1069 : :
1070 : 0 : frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len;
1071 : 0 : frag->msg_header.seq = s->d1->w_msg_hdr.seq;
1072 : 0 : frag->msg_header.type = s->d1->w_msg_hdr.type;
1073 : 0 : frag->msg_header.frag_off = 0;
1074 : 0 : frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len;
1075 : 0 : frag->msg_header.is_ccs = is_ccs;
1076 : :
1077 : : /* save current state*/
1078 : 0 : frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx;
1079 : 0 : frag->msg_header.saved_retransmit_state.write_hash = s->write_hash;
1080 : 0 : frag->msg_header.saved_retransmit_state.compress = s->compress;
1081 : 0 : frag->msg_header.saved_retransmit_state.session = s->session;
1082 : 0 : frag->msg_header.saved_retransmit_state.epoch = s->d1->w_epoch;
1083 : :
1084 : : memset(seq64be,0,sizeof(seq64be));
1085 : 0 : seq64be[6] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq,
1086 : 0 : frag->msg_header.is_ccs)>>8);
1087 : 0 : seq64be[7] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq,
1088 : : frag->msg_header.is_ccs));
1089 : :
1090 : 0 : item = pitem_new(seq64be, frag);
1091 [ # # ]: 0 : if ( item == NULL)
1092 : : {
1093 : 0 : dtls1_hm_fragment_free(frag);
1094 : 0 : return 0;
1095 : : }
1096 : :
1097 : : #if 0
1098 : : fprintf( stderr, "buffered messge: \ttype = %xx\n", msg_buf->type);
1099 : : fprintf( stderr, "\t\t\t\t\tlen = %d\n", msg_buf->len);
1100 : : fprintf( stderr, "\t\t\t\t\tseq_num = %d\n", msg_buf->seq_num);
1101 : : #endif
1102 : :
1103 : 0 : pqueue_insert(s->d1->sent_messages, item);
1104 : 0 : return 1;
1105 : : }
1106 : :
1107 : : int
1108 : 0 : dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
1109 : : int *found)
1110 : : {
1111 : : int ret;
1112 : : /* XDTLS: for now assuming that read/writes are blocking */
1113 : : pitem *item;
1114 : : hm_fragment *frag ;
1115 : : unsigned long header_length;
1116 : : unsigned char seq64be[8];
1117 : : struct dtls1_retransmit_state saved_state;
1118 : : unsigned char save_write_sequence[8];
1119 : :
1120 : : /*
1121 : : OPENSSL_assert(s->init_num == 0);
1122 : : OPENSSL_assert(s->init_off == 0);
1123 : : */
1124 : :
1125 : : /* XDTLS: the requested message ought to be found, otherwise error */
1126 : : memset(seq64be,0,sizeof(seq64be));
1127 : 0 : seq64be[6] = (unsigned char)(seq>>8);
1128 : 0 : seq64be[7] = (unsigned char)seq;
1129 : :
1130 : 0 : item = pqueue_find(s->d1->sent_messages, seq64be);
1131 [ # # ]: 0 : if ( item == NULL)
1132 : : {
1133 : 0 : fprintf(stderr, "retransmit: message %d non-existant\n", seq);
1134 : 0 : *found = 0;
1135 : 0 : return 0;
1136 : : }
1137 : :
1138 : 0 : *found = 1;
1139 : 0 : frag = (hm_fragment *)item->data;
1140 : :
1141 [ # # ]: 0 : if ( frag->msg_header.is_ccs)
1142 : : header_length = DTLS1_CCS_HEADER_LENGTH;
1143 : : else
1144 : 0 : header_length = DTLS1_HM_HEADER_LENGTH;
1145 : :
1146 : 0 : memcpy(s->init_buf->data, frag->fragment,
1147 : 0 : frag->msg_header.msg_len + header_length);
1148 : 0 : s->init_num = frag->msg_header.msg_len + header_length;
1149 : :
1150 : 0 : dtls1_set_message_header_int(s, frag->msg_header.type,
1151 : 0 : frag->msg_header.msg_len, frag->msg_header.seq, 0,
1152 : : frag->msg_header.frag_len);
1153 : :
1154 : : /* save current state */
1155 : 0 : saved_state.enc_write_ctx = s->enc_write_ctx;
1156 : 0 : saved_state.write_hash = s->write_hash;
1157 : 0 : saved_state.compress = s->compress;
1158 : 0 : saved_state.session = s->session;
1159 : 0 : saved_state.epoch = s->d1->w_epoch;
1160 : 0 : saved_state.epoch = s->d1->w_epoch;
1161 : :
1162 : 0 : s->d1->retransmitting = 1;
1163 : :
1164 : : /* restore state in which the message was originally sent */
1165 : 0 : s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx;
1166 : 0 : s->write_hash = frag->msg_header.saved_retransmit_state.write_hash;
1167 : 0 : s->compress = frag->msg_header.saved_retransmit_state.compress;
1168 : 0 : s->session = frag->msg_header.saved_retransmit_state.session;
1169 : 0 : s->d1->w_epoch = frag->msg_header.saved_retransmit_state.epoch;
1170 : :
1171 [ # # ]: 0 : if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1)
1172 : : {
1173 : 0 : memcpy(save_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence));
1174 : 0 : memcpy(s->s3->write_sequence, s->d1->last_write_sequence, sizeof(s->s3->write_sequence));
1175 : : }
1176 : :
1177 [ # # ]: 0 : ret = dtls1_do_write(s, frag->msg_header.is_ccs ?
1178 : : SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
1179 : :
1180 : : /* restore current state */
1181 : 0 : s->enc_write_ctx = saved_state.enc_write_ctx;
1182 : 0 : s->write_hash = saved_state.write_hash;
1183 : 0 : s->compress = saved_state.compress;
1184 : 0 : s->session = saved_state.session;
1185 : 0 : s->d1->w_epoch = saved_state.epoch;
1186 : :
1187 [ # # ]: 0 : if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1)
1188 : : {
1189 : 0 : memcpy(s->d1->last_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence));
1190 : 0 : memcpy(s->s3->write_sequence, save_write_sequence, sizeof(s->s3->write_sequence));
1191 : : }
1192 : :
1193 : 0 : s->d1->retransmitting = 0;
1194 : :
1195 : 0 : (void)BIO_flush(SSL_get_wbio(s));
1196 : 0 : return ret;
1197 : : }
1198 : :
1199 : : /* call this function when the buffered messages are no longer needed */
1200 : : void
1201 : 0 : dtls1_clear_record_buffer(SSL *s)
1202 : : {
1203 : : pitem *item;
1204 : :
1205 [ # # ]: 0 : for(item = pqueue_pop(s->d1->sent_messages);
1206 : 0 : item != NULL; item = pqueue_pop(s->d1->sent_messages))
1207 : : {
1208 : 0 : dtls1_hm_fragment_free((hm_fragment *)item->data);
1209 : 0 : pitem_free(item);
1210 : : }
1211 : 0 : }
1212 : :
1213 : :
1214 : : unsigned char *
1215 : 0 : dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt,
1216 : : unsigned long len, unsigned long frag_off, unsigned long frag_len)
1217 : : {
1218 : : /* Don't change sequence numbers while listening */
1219 [ # # ][ # # ]: 0 : if (frag_off == 0 && !s->d1->listen)
1220 : : {
1221 : 0 : s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
1222 : 0 : s->d1->next_handshake_write_seq++;
1223 : : }
1224 : :
1225 : 0 : dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq,
1226 : : frag_off, frag_len);
1227 : :
1228 : 0 : return p += DTLS1_HM_HEADER_LENGTH;
1229 : : }
1230 : :
1231 : :
1232 : : /* don't actually do the writing, wait till the MTU has been retrieved */
1233 : : static void
1234 : 0 : dtls1_set_message_header_int(SSL *s, unsigned char mt,
1235 : : unsigned long len, unsigned short seq_num, unsigned long frag_off,
1236 : : unsigned long frag_len)
1237 : : {
1238 : 0 : struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1239 : :
1240 : 0 : msg_hdr->type = mt;
1241 : 0 : msg_hdr->msg_len = len;
1242 : 0 : msg_hdr->seq = seq_num;
1243 : 0 : msg_hdr->frag_off = frag_off;
1244 : 0 : msg_hdr->frag_len = frag_len;
1245 : 0 : }
1246 : :
1247 : : static void
1248 : 0 : dtls1_fix_message_header(SSL *s, unsigned long frag_off,
1249 : : unsigned long frag_len)
1250 : : {
1251 : 0 : struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1252 : :
1253 : 0 : msg_hdr->frag_off = frag_off;
1254 : 0 : msg_hdr->frag_len = frag_len;
1255 : 0 : }
1256 : :
1257 : : static unsigned char *
1258 : 0 : dtls1_write_message_header(SSL *s, unsigned char *p)
1259 : : {
1260 : 0 : struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
1261 : :
1262 : 0 : *p++ = msg_hdr->type;
1263 : 0 : l2n3(msg_hdr->msg_len, p);
1264 : :
1265 : 0 : s2n(msg_hdr->seq, p);
1266 : 0 : l2n3(msg_hdr->frag_off, p);
1267 : 0 : l2n3(msg_hdr->frag_len, p);
1268 : :
1269 : 0 : return p;
1270 : : }
1271 : :
1272 : : unsigned int
1273 : 0 : dtls1_min_mtu(void)
1274 : : {
1275 : 0 : return (g_probable_mtu[(sizeof(g_probable_mtu) /
1276 : : sizeof(g_probable_mtu[0])) - 1]);
1277 : : }
1278 : :
1279 : : static unsigned int
1280 : 0 : dtls1_guess_mtu(unsigned int curr_mtu)
1281 : : {
1282 : : unsigned int i;
1283 : :
1284 [ # # ]: 0 : if ( curr_mtu == 0 )
1285 : 0 : return g_probable_mtu[0] ;
1286 : :
1287 [ # # ]: 0 : for ( i = 0; i < sizeof(g_probable_mtu)/sizeof(g_probable_mtu[0]); i++)
1288 [ # # ]: 0 : if ( curr_mtu > g_probable_mtu[i])
1289 : : return g_probable_mtu[i];
1290 : :
1291 : : return curr_mtu;
1292 : : }
1293 : :
1294 : : void
1295 : 0 : dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr)
1296 : : {
1297 : : memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
1298 : 0 : msg_hdr->type = *(data++);
1299 : 0 : n2l3(data, msg_hdr->msg_len);
1300 : :
1301 : 0 : n2s(data, msg_hdr->seq);
1302 : 0 : n2l3(data, msg_hdr->frag_off);
1303 : 0 : n2l3(data, msg_hdr->frag_len);
1304 : 0 : }
1305 : :
1306 : : void
1307 : 0 : dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr)
1308 : : {
1309 : : memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st));
1310 : :
1311 : 0 : ccs_hdr->type = *(data++);
1312 : 0 : }
1313 : :
1314 : 0 : int dtls1_shutdown(SSL *s)
1315 : : {
1316 : : int ret;
1317 : : #ifndef OPENSSL_NO_SCTP
1318 : : if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
1319 : : !(s->shutdown & SSL_SENT_SHUTDOWN))
1320 : : {
1321 : : ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
1322 : : if (ret < 0) return -1;
1323 : :
1324 : : if (ret == 0)
1325 : : BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 1, NULL);
1326 : : }
1327 : : #endif
1328 : 0 : ret = ssl3_shutdown(s);
1329 : : #ifndef OPENSSL_NO_SCTP
1330 : : BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 0, NULL);
1331 : : #endif
1332 : 0 : return ret;
1333 : : }
1334 : :
1335 : : #ifndef OPENSSL_NO_HEARTBEATS
1336 : : int
1337 : 0 : dtls1_process_heartbeat(SSL *s)
1338 : : {
1339 : 0 : unsigned char *p = &s->s3->rrec.data[0], *pl;
1340 : : unsigned short hbtype;
1341 : : unsigned int payload;
1342 : 0 : unsigned int padding = 16; /* Use minimum padding */
1343 : :
1344 [ # # ]: 0 : if (s->msg_callback)
1345 : 0 : s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
1346 : 0 : &s->s3->rrec.data[0], s->s3->rrec.length,
1347 : : s, s->msg_callback_arg);
1348 : :
1349 : : /* Read type and payload length first */
1350 [ # # ]: 0 : if (1 + 2 + 16 > s->s3->rrec.length)
1351 : : return 0; /* silently discard */
1352 : 0 : hbtype = *p++;
1353 : 0 : n2s(p, payload);
1354 [ # # ]: 0 : if (1 + 2 + payload + 16 > s->s3->rrec.length)
1355 : : return 0; /* silently discard per RFC 6520 sec. 4 */
1356 : 0 : pl = p;
1357 : :
1358 [ # # ]: 0 : if (hbtype == TLS1_HB_REQUEST)
1359 : : {
1360 : : unsigned char *buffer, *bp;
1361 : 0 : unsigned int write_length = 1 /* heartbeat type */ +
1362 : : 2 /* heartbeat length */ +
1363 : : payload + padding;
1364 : : int r;
1365 : :
1366 [ # # ]: 0 : if (write_length > SSL3_RT_MAX_PLAIN_LENGTH)
1367 : : return 0;
1368 : :
1369 : : /* Allocate memory for the response, size is 1 byte
1370 : : * message type, plus 2 bytes payload length, plus
1371 : : * payload, plus padding
1372 : : */
1373 : 0 : buffer = OPENSSL_malloc(write_length);
1374 : 0 : bp = buffer;
1375 : :
1376 : : /* Enter response type, length and copy payload */
1377 : 0 : *bp++ = TLS1_HB_RESPONSE;
1378 : 0 : s2n(payload, bp);
1379 : 0 : memcpy(bp, pl, payload);
1380 : 0 : bp += payload;
1381 : : /* Random padding */
1382 : 0 : RAND_pseudo_bytes(bp, padding);
1383 : :
1384 : 0 : r = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, write_length);
1385 : :
1386 [ # # ][ # # ]: 0 : if (r >= 0 && s->msg_callback)
1387 : 0 : s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
1388 : : buffer, write_length,
1389 : : s, s->msg_callback_arg);
1390 : :
1391 : 0 : OPENSSL_free(buffer);
1392 : :
1393 [ # # ]: 0 : if (r < 0)
1394 : 0 : return r;
1395 : : }
1396 [ # # ]: 0 : else if (hbtype == TLS1_HB_RESPONSE)
1397 : : {
1398 : : unsigned int seq;
1399 : :
1400 : : /* We only send sequence numbers (2 bytes unsigned int),
1401 : : * and 16 random bytes, so we just try to read the
1402 : : * sequence number */
1403 : 0 : n2s(pl, seq);
1404 : :
1405 [ # # ][ # # ]: 0 : if (payload == 18 && seq == s->tlsext_hb_seq)
1406 : : {
1407 : 0 : dtls1_stop_timer(s);
1408 : 0 : s->tlsext_hb_seq++;
1409 : 0 : s->tlsext_hb_pending = 0;
1410 : : }
1411 : : }
1412 : :
1413 : : return 0;
1414 : : }
1415 : :
1416 : : int
1417 : 0 : dtls1_heartbeat(SSL *s)
1418 : : {
1419 : : unsigned char *buf, *p;
1420 : : int ret;
1421 : 0 : unsigned int payload = 18; /* Sequence number + random bytes */
1422 : 0 : unsigned int padding = 16; /* Use minimum padding */
1423 : :
1424 : : /* Only send if peer supports and accepts HB requests... */
1425 [ # # ]: 0 : if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
1426 : : s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
1427 : : {
1428 : 0 : SSLerr(SSL_F_DTLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
1429 : 0 : return -1;
1430 : : }
1431 : :
1432 : : /* ...and there is none in flight yet... */
1433 [ # # ]: 0 : if (s->tlsext_hb_pending)
1434 : : {
1435 : 0 : SSLerr(SSL_F_DTLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
1436 : 0 : return -1;
1437 : : }
1438 : :
1439 : : /* ...and no handshake in progress. */
1440 [ # # ][ # # ]: 0 : if (SSL_in_init(s) || s->in_handshake)
1441 : : {
1442 : 0 : SSLerr(SSL_F_DTLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
1443 : 0 : return -1;
1444 : : }
1445 : :
1446 : : /* Check if padding is too long, payload and padding
1447 : : * must not exceed 2^14 - 3 = 16381 bytes in total.
1448 : : */
1449 : : OPENSSL_assert(payload + padding <= 16381);
1450 : :
1451 : : /* Create HeartBeat message, we just use a sequence number
1452 : : * as payload to distuingish different messages and add
1453 : : * some random stuff.
1454 : : * - Message Type, 1 byte
1455 : : * - Payload Length, 2 bytes (unsigned int)
1456 : : * - Payload, the sequence number (2 bytes uint)
1457 : : * - Payload, random bytes (16 bytes uint)
1458 : : * - Padding
1459 : : */
1460 : 0 : buf = OPENSSL_malloc(1 + 2 + payload + padding);
1461 : 0 : p = buf;
1462 : : /* Message Type */
1463 : 0 : *p++ = TLS1_HB_REQUEST;
1464 : : /* Payload length (18 bytes here) */
1465 : 0 : s2n(payload, p);
1466 : : /* Sequence number */
1467 : 0 : s2n(s->tlsext_hb_seq, p);
1468 : : /* 16 random bytes */
1469 : 0 : RAND_pseudo_bytes(p, 16);
1470 : 0 : p += 16;
1471 : : /* Random padding */
1472 : 0 : RAND_pseudo_bytes(p, padding);
1473 : :
1474 : 0 : ret = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
1475 [ # # ]: 0 : if (ret >= 0)
1476 : : {
1477 [ # # ]: 0 : if (s->msg_callback)
1478 : 0 : s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
1479 : : buf, 3 + payload + padding,
1480 : : s, s->msg_callback_arg);
1481 : :
1482 : 0 : dtls1_start_timer(s);
1483 : 0 : s->tlsext_hb_pending = 1;
1484 : : }
1485 : :
1486 : 0 : OPENSSL_free(buf);
1487 : :
1488 : 0 : return ret;
1489 : : }
1490 : : #endif
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