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36d16f8e | 1 | /* ssl/d1_both.c */ |
0f113f3e | 2 | /* |
36d16f8e | 3 | * DTLS implementation written by Nagendra Modadugu |
0f113f3e | 4 | * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. |
36d16f8e BL |
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 | |
0f113f3e | 14 | * notice, this list of conditions and the following disclaimer. |
36d16f8e BL |
15 | * |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
90acf770 AP |
17 | * notice, this list of conditions and the following disclaimer in |
18 | * the documentation and/or other materials provided with the | |
19 | * distribution. | |
36d16f8e BL |
20 | * |
21 | * 3. All advertising materials mentioning features or use of this | |
90acf770 AP |
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/)" | |
36d16f8e BL |
25 | * |
26 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
90acf770 AP |
27 | * endorse or promote products derived from this software without |
28 | * prior written permission. For written permission, please contact | |
29 | * openssl-core@openssl.org. | |
36d16f8e BL |
30 | * |
31 | * 5. Products derived from this software may not be called "OpenSSL" | |
90acf770 AP |
32 | * nor may "OpenSSL" appear in their names without prior written |
33 | * permission of the OpenSSL Project. | |
36d16f8e BL |
34 | * |
35 | * 6. Redistributions of any form whatsoever must retain the following | |
90acf770 AP |
36 | * acknowledgment: |
37 | * "This product includes software developed by the OpenSSL Project | |
38 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
36d16f8e BL |
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. | |
0f113f3e | 65 | * |
36d16f8e BL |
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). | |
0f113f3e | 72 | * |
36d16f8e BL |
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. | |
0f113f3e | 79 | * |
36d16f8e BL |
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 | |
90acf770 | 84 | * notice, this list of conditions and the following disclaimer. |
36d16f8e | 85 | * 2. Redistributions in binary form must reproduce the above copyright |
90acf770 AP |
86 | * notice, this list of conditions and the following disclaimer in the |
87 | * documentation and/or other materials provided with the distribution. | |
36d16f8e | 88 | * 3. All advertising materials mentioning features or use of this software |
90acf770 AP |
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 :-). | |
0f113f3e | 94 | * 4. If you include any Windows specific code (or a derivative thereof) from |
90acf770 AP |
95 | * the apps directory (application code) you must include an acknowledgement: |
96 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 97 | * |
36d16f8e BL |
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. | |
0f113f3e | 109 | * |
36d16f8e BL |
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 | ||
934e22e8 DSH |
126 | #define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8) |
127 | ||
128 | #define RSMBLY_BITMASK_MARK(bitmask, start, end) { \ | |
0f113f3e MC |
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 | } } | |
934e22e8 DSH |
138 | |
139 | #define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \ | |
0f113f3e MC |
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; } } | |
934e22e8 | 146 | |
0f113f3e MC |
147 | static unsigned char bitmask_start_values[] = |
148 | { 0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80 }; | |
149 | static unsigned char bitmask_end_values[] = | |
150 | { 0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f }; | |
36d16f8e BL |
151 | |
152 | /* XDTLS: figure out the right values */ | |
0f113f3e | 153 | static const unsigned int g_probable_mtu[] = { 1500, 512, 256 }; |
36d16f8e | 154 | |
0f113f3e MC |
155 | static void dtls1_fix_message_header(SSL *s, unsigned long frag_off, |
156 | unsigned long frag_len); | |
157 | static unsigned char *dtls1_write_message_header(SSL *s, unsigned char *p); | |
36d16f8e | 158 | static void dtls1_set_message_header_int(SSL *s, unsigned char mt, |
0f113f3e MC |
159 | unsigned long len, |
160 | unsigned short seq_num, | |
161 | unsigned long frag_off, | |
162 | unsigned long frag_len); | |
163 | static long dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, | |
164 | int *ok); | |
165 | ||
166 | static hm_fragment *dtls1_hm_fragment_new(unsigned long frag_len, | |
167 | int reassembly) | |
168 | { | |
169 | hm_fragment *frag = NULL; | |
170 | unsigned char *buf = NULL; | |
171 | unsigned char *bitmask = NULL; | |
172 | ||
b196e7d9 | 173 | frag = OPENSSL_malloc(sizeof(hm_fragment)); |
0f113f3e MC |
174 | if (frag == NULL) |
175 | return NULL; | |
176 | ||
177 | if (frag_len) { | |
b196e7d9 | 178 | buf = OPENSSL_malloc(frag_len); |
0f113f3e MC |
179 | if (buf == NULL) { |
180 | OPENSSL_free(frag); | |
181 | return NULL; | |
182 | } | |
183 | } | |
184 | ||
185 | /* zero length fragment gets zero frag->fragment */ | |
186 | frag->fragment = buf; | |
187 | ||
188 | /* Initialize reassembly bitmask if necessary */ | |
189 | if (reassembly) { | |
b196e7d9 | 190 | bitmask = OPENSSL_malloc(RSMBLY_BITMASK_SIZE(frag_len)); |
0f113f3e | 191 | if (bitmask == NULL) { |
b548a1f1 | 192 | OPENSSL_free(buf); |
0f113f3e MC |
193 | OPENSSL_free(frag); |
194 | return NULL; | |
195 | } | |
196 | memset(bitmask, 0, RSMBLY_BITMASK_SIZE(frag_len)); | |
197 | } | |
198 | ||
199 | frag->reassembly = bitmask; | |
200 | ||
201 | return frag; | |
202 | } | |
36d16f8e | 203 | |
8a35dbb6 | 204 | void dtls1_hm_fragment_free(hm_fragment *frag) |
0f113f3e | 205 | { |
25aaa98a RS |
206 | if (!frag) |
207 | return; | |
0f113f3e MC |
208 | if (frag->msg_header.is_ccs) { |
209 | EVP_CIPHER_CTX_free(frag->msg_header. | |
210 | saved_retransmit_state.enc_write_ctx); | |
211 | EVP_MD_CTX_destroy(frag->msg_header. | |
212 | saved_retransmit_state.write_hash); | |
213 | } | |
b548a1f1 RS |
214 | OPENSSL_free(frag->fragment); |
215 | OPENSSL_free(frag->reassembly); | |
0f113f3e MC |
216 | OPENSSL_free(frag); |
217 | } | |
36d16f8e | 218 | |
1620a2e4 | 219 | static int dtls1_query_mtu(SSL *s) |
6abb0d1f | 220 | { |
0f113f3e MC |
221 | if (s->d1->link_mtu) { |
222 | s->d1->mtu = | |
223 | s->d1->link_mtu - BIO_dgram_get_mtu_overhead(SSL_get_wbio(s)); | |
224 | s->d1->link_mtu = 0; | |
225 | } | |
226 | ||
227 | /* AHA! Figure out the MTU, and stick to the right size */ | |
228 | if (s->d1->mtu < dtls1_min_mtu(s)) { | |
229 | if (!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) { | |
230 | s->d1->mtu = | |
231 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); | |
232 | ||
233 | /* | |
234 | * I've seen the kernel return bogus numbers when it doesn't know | |
235 | * (initial write), so just make sure we have a reasonable number | |
236 | */ | |
237 | if (s->d1->mtu < dtls1_min_mtu(s)) { | |
238 | /* Set to min mtu */ | |
239 | s->d1->mtu = dtls1_min_mtu(s); | |
240 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU, | |
241 | s->d1->mtu, NULL); | |
242 | } | |
243 | } else | |
244 | return 0; | |
245 | } | |
246 | return 1; | |
6abb0d1f MC |
247 | } |
248 | ||
0f113f3e MC |
249 | /* |
250 | * send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or | |
251 | * SSL3_RT_CHANGE_CIPHER_SPEC) | |
252 | */ | |
6abb0d1f | 253 | int dtls1_do_write(SSL *s, int type) |
0f113f3e MC |
254 | { |
255 | int ret; | |
256 | unsigned int curr_mtu; | |
257 | int retry = 1; | |
258 | unsigned int len, frag_off, mac_size, blocksize, used_len; | |
259 | ||
260 | if (!dtls1_query_mtu(s)) | |
261 | return -1; | |
262 | ||
263 | OPENSSL_assert(s->d1->mtu >= dtls1_min_mtu(s)); /* should have something | |
264 | * reasonable now */ | |
265 | ||
266 | if (s->init_off == 0 && type == SSL3_RT_HANDSHAKE) | |
267 | OPENSSL_assert(s->init_num == | |
268 | (int)s->d1->w_msg_hdr.msg_len + | |
269 | DTLS1_HM_HEADER_LENGTH); | |
270 | ||
271 | if (s->write_hash) { | |
272 | if (s->enc_write_ctx | |
273 | && EVP_CIPHER_CTX_mode(s->enc_write_ctx) == EVP_CIPH_GCM_MODE) | |
274 | mac_size = 0; | |
275 | else | |
276 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
277 | } else | |
278 | mac_size = 0; | |
279 | ||
280 | if (s->enc_write_ctx && | |
281 | (EVP_CIPHER_CTX_mode(s->enc_write_ctx) == EVP_CIPH_CBC_MODE)) | |
282 | blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher); | |
283 | else | |
284 | blocksize = 0; | |
285 | ||
286 | frag_off = 0; | |
287 | /* s->init_num shouldn't ever be < 0...but just in case */ | |
288 | while (s->init_num > 0) { | |
289 | used_len = BIO_wpending(SSL_get_wbio(s)) + DTLS1_RT_HEADER_LENGTH | |
290 | + mac_size + blocksize; | |
291 | if (s->d1->mtu > used_len) | |
292 | curr_mtu = s->d1->mtu - used_len; | |
293 | else | |
294 | curr_mtu = 0; | |
295 | ||
296 | if (curr_mtu <= DTLS1_HM_HEADER_LENGTH) { | |
297 | /* | |
298 | * grr.. we could get an error if MTU picked was wrong | |
299 | */ | |
300 | ret = BIO_flush(SSL_get_wbio(s)); | |
301 | if (ret <= 0) | |
302 | return ret; | |
303 | used_len = DTLS1_RT_HEADER_LENGTH + mac_size + blocksize; | |
304 | if (s->d1->mtu > used_len + DTLS1_HM_HEADER_LENGTH) { | |
305 | curr_mtu = s->d1->mtu - used_len; | |
306 | } else { | |
307 | /* Shouldn't happen */ | |
308 | return -1; | |
309 | } | |
310 | } | |
311 | ||
312 | /* | |
313 | * We just checked that s->init_num > 0 so this cast should be safe | |
314 | */ | |
315 | if (((unsigned int)s->init_num) > curr_mtu) | |
316 | len = curr_mtu; | |
317 | else | |
318 | len = s->init_num; | |
319 | ||
320 | /* Shouldn't ever happen */ | |
321 | if (len > INT_MAX) | |
322 | len = INT_MAX; | |
323 | ||
324 | /* | |
325 | * XDTLS: this function is too long. split out the CCS part | |
326 | */ | |
327 | if (type == SSL3_RT_HANDSHAKE) { | |
328 | if (s->init_off != 0) { | |
329 | OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH); | |
330 | s->init_off -= DTLS1_HM_HEADER_LENGTH; | |
331 | s->init_num += DTLS1_HM_HEADER_LENGTH; | |
332 | ||
333 | /* | |
334 | * We just checked that s->init_num > 0 so this cast should | |
335 | * be safe | |
336 | */ | |
337 | if (((unsigned int)s->init_num) > curr_mtu) | |
338 | len = curr_mtu; | |
339 | else | |
340 | len = s->init_num; | |
341 | } | |
342 | ||
343 | /* Shouldn't ever happen */ | |
344 | if (len > INT_MAX) | |
345 | len = INT_MAX; | |
346 | ||
347 | if (len < DTLS1_HM_HEADER_LENGTH) { | |
348 | /* | |
349 | * len is so small that we really can't do anything sensible | |
350 | * so fail | |
351 | */ | |
352 | return -1; | |
353 | } | |
354 | dtls1_fix_message_header(s, frag_off, | |
355 | len - DTLS1_HM_HEADER_LENGTH); | |
356 | ||
357 | dtls1_write_message_header(s, | |
358 | (unsigned char *)&s->init_buf-> | |
359 | data[s->init_off]); | |
360 | } | |
361 | ||
362 | ret = dtls1_write_bytes(s, type, &s->init_buf->data[s->init_off], | |
363 | len); | |
364 | if (ret < 0) { | |
365 | /* | |
366 | * might need to update MTU here, but we don't know which | |
367 | * previous packet caused the failure -- so can't really | |
368 | * retransmit anything. continue as if everything is fine and | |
369 | * wait for an alert to handle the retransmit | |
370 | */ | |
371 | if (retry && BIO_ctrl(SSL_get_wbio(s), | |
372 | BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0) { | |
373 | if (!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) { | |
374 | if (!dtls1_query_mtu(s)) | |
375 | return -1; | |
376 | /* Have one more go */ | |
377 | retry = 0; | |
378 | } else | |
379 | return -1; | |
380 | } else { | |
381 | return (-1); | |
382 | } | |
383 | } else { | |
384 | ||
385 | /* | |
386 | * bad if this assert fails, only part of the handshake message | |
387 | * got sent. but why would this happen? | |
388 | */ | |
389 | OPENSSL_assert(len == (unsigned int)ret); | |
390 | ||
391 | if (type == SSL3_RT_HANDSHAKE && !s->d1->retransmitting) { | |
392 | /* | |
393 | * should not be done for 'Hello Request's, but in that case | |
394 | * we'll ignore the result anyway | |
395 | */ | |
396 | unsigned char *p = | |
397 | (unsigned char *)&s->init_buf->data[s->init_off]; | |
398 | const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
399 | int xlen; | |
400 | ||
401 | if (frag_off == 0 && s->version != DTLS1_BAD_VER) { | |
402 | /* | |
403 | * reconstruct message header is if it is being sent in | |
404 | * single fragment | |
405 | */ | |
406 | *p++ = msg_hdr->type; | |
407 | l2n3(msg_hdr->msg_len, p); | |
408 | s2n(msg_hdr->seq, p); | |
409 | l2n3(0, p); | |
410 | l2n3(msg_hdr->msg_len, p); | |
411 | p -= DTLS1_HM_HEADER_LENGTH; | |
412 | xlen = ret; | |
413 | } else { | |
414 | p += DTLS1_HM_HEADER_LENGTH; | |
415 | xlen = ret - DTLS1_HM_HEADER_LENGTH; | |
416 | } | |
417 | ||
418 | ssl3_finish_mac(s, p, xlen); | |
419 | } | |
420 | ||
421 | if (ret == s->init_num) { | |
422 | if (s->msg_callback) | |
423 | s->msg_callback(1, s->version, type, s->init_buf->data, | |
424 | (size_t)(s->init_off + s->init_num), s, | |
425 | s->msg_callback_arg); | |
426 | ||
427 | s->init_off = 0; /* done writing this message */ | |
428 | s->init_num = 0; | |
429 | ||
430 | return (1); | |
431 | } | |
432 | s->init_off += ret; | |
433 | s->init_num -= ret; | |
434 | frag_off += (ret -= DTLS1_HM_HEADER_LENGTH); | |
435 | } | |
436 | } | |
437 | return (0); | |
438 | } | |
439 | ||
440 | /* | |
441 | * Obtain handshake message of message type 'mt' (any if mt == -1), maximum | |
442 | * acceptable body length 'max'. Read an entire handshake message. Handshake | |
443 | * messages arrive in fragments. | |
36d16f8e | 444 | */ |
beb056b3 | 445 | long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok) |
0f113f3e MC |
446 | { |
447 | int i, al; | |
448 | struct hm_header_st *msg_hdr; | |
449 | unsigned char *p; | |
450 | unsigned long msg_len; | |
451 | ||
452 | /* | |
453 | * s3->tmp is used to store messages that are unexpected, caused by the | |
454 | * absence of an optional handshake message | |
455 | */ | |
456 | if (s->s3->tmp.reuse_message) { | |
457 | s->s3->tmp.reuse_message = 0; | |
458 | if ((mt >= 0) && (s->s3->tmp.message_type != mt)) { | |
459 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
460 | SSLerr(SSL_F_DTLS1_GET_MESSAGE, SSL_R_UNEXPECTED_MESSAGE); | |
461 | goto f_err; | |
462 | } | |
463 | *ok = 1; | |
464 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
465 | s->init_num = (int)s->s3->tmp.message_size; | |
466 | return s->init_num; | |
467 | } | |
468 | ||
469 | msg_hdr = &s->d1->r_msg_hdr; | |
470 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
471 | ||
472 | again: | |
473 | i = dtls1_get_message_fragment(s, st1, stn, max, ok); | |
474 | if (i == DTLS1_HM_BAD_FRAGMENT || i == DTLS1_HM_FRAGMENT_RETRY) { | |
475 | /* bad fragment received */ | |
476 | goto again; | |
477 | } else if (i <= 0 && !*ok) { | |
478 | return i; | |
479 | } | |
480 | ||
481 | p = (unsigned char *)s->init_buf->data; | |
482 | msg_len = msg_hdr->msg_len; | |
483 | ||
484 | /* reconstruct message header */ | |
485 | *(p++) = msg_hdr->type; | |
486 | l2n3(msg_len, p); | |
487 | s2n(msg_hdr->seq, p); | |
488 | l2n3(0, p); | |
489 | l2n3(msg_len, p); | |
490 | if (s->version != DTLS1_BAD_VER) { | |
491 | p -= DTLS1_HM_HEADER_LENGTH; | |
492 | msg_len += DTLS1_HM_HEADER_LENGTH; | |
493 | } | |
494 | ||
495 | ssl3_finish_mac(s, p, msg_len); | |
496 | if (s->msg_callback) | |
497 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
498 | p, msg_len, s, s->msg_callback_arg); | |
499 | ||
500 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
501 | ||
502 | /* Don't change sequence numbers while listening */ | |
503 | if (!s->d1->listen) | |
504 | s->d1->handshake_read_seq++; | |
505 | ||
506 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
507 | return s->init_num; | |
508 | ||
509 | f_err: | |
510 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
511 | *ok = 0; | |
512 | return -1; | |
513 | } | |
90acf770 | 514 | |
0f113f3e MC |
515 | static int dtls1_preprocess_fragment(SSL *s, struct hm_header_st *msg_hdr, |
516 | int max) | |
517 | { | |
518 | size_t frag_off, frag_len, msg_len; | |
519 | ||
520 | msg_len = msg_hdr->msg_len; | |
521 | frag_off = msg_hdr->frag_off; | |
522 | frag_len = msg_hdr->frag_len; | |
523 | ||
524 | /* sanity checking */ | |
525 | if ((frag_off + frag_len) > msg_len) { | |
526 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
527 | return SSL_AD_ILLEGAL_PARAMETER; | |
528 | } | |
529 | ||
530 | if ((frag_off + frag_len) > (unsigned long)max) { | |
531 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
532 | return SSL_AD_ILLEGAL_PARAMETER; | |
533 | } | |
534 | ||
535 | if (s->d1->r_msg_hdr.frag_off == 0) { /* first fragment */ | |
536 | /* | |
537 | * msg_len is limited to 2^24, but is effectively checked against max | |
538 | * above | |
539 | */ | |
540 | if (!BUF_MEM_grow_clean | |
541 | (s->init_buf, msg_len + DTLS1_HM_HEADER_LENGTH)) { | |
542 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, ERR_R_BUF_LIB); | |
543 | return SSL_AD_INTERNAL_ERROR; | |
544 | } | |
545 | ||
546 | s->s3->tmp.message_size = msg_len; | |
547 | s->d1->r_msg_hdr.msg_len = msg_len; | |
548 | s->s3->tmp.message_type = msg_hdr->type; | |
549 | s->d1->r_msg_hdr.type = msg_hdr->type; | |
550 | s->d1->r_msg_hdr.seq = msg_hdr->seq; | |
551 | } else if (msg_len != s->d1->r_msg_hdr.msg_len) { | |
552 | /* | |
553 | * They must be playing with us! BTW, failure to enforce upper limit | |
554 | * would open possibility for buffer overrun. | |
555 | */ | |
556 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
557 | return SSL_AD_ILLEGAL_PARAMETER; | |
558 | } | |
559 | ||
560 | return 0; /* no error */ | |
561 | } | |
90acf770 | 562 | |
0f113f3e MC |
563 | static int dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok) |
564 | { | |
50e735f9 MC |
565 | /*- |
566 | * (0) check whether the desired fragment is available | |
567 | * if so: | |
568 | * (1) copy over the fragment to s->init_buf->data[] | |
569 | * (2) update s->init_num | |
570 | */ | |
0f113f3e MC |
571 | pitem *item; |
572 | hm_fragment *frag; | |
573 | int al; | |
574 | ||
575 | *ok = 0; | |
576 | item = pqueue_peek(s->d1->buffered_messages); | |
577 | if (item == NULL) | |
578 | return 0; | |
579 | ||
580 | frag = (hm_fragment *)item->data; | |
581 | ||
582 | /* Don't return if reassembly still in progress */ | |
583 | if (frag->reassembly != NULL) | |
584 | return 0; | |
585 | ||
586 | if (s->d1->handshake_read_seq == frag->msg_header.seq) { | |
587 | unsigned long frag_len = frag->msg_header.frag_len; | |
588 | pqueue_pop(s->d1->buffered_messages); | |
589 | ||
590 | al = dtls1_preprocess_fragment(s, &frag->msg_header, max); | |
591 | ||
592 | if (al == 0) { /* no alert */ | |
593 | unsigned char *p = | |
594 | (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
595 | memcpy(&p[frag->msg_header.frag_off], frag->fragment, | |
596 | frag->msg_header.frag_len); | |
597 | } | |
598 | ||
599 | dtls1_hm_fragment_free(frag); | |
600 | pitem_free(item); | |
601 | ||
602 | if (al == 0) { | |
603 | *ok = 1; | |
604 | return frag_len; | |
605 | } | |
606 | ||
607 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
608 | s->init_num = 0; | |
609 | *ok = 0; | |
610 | return -1; | |
611 | } else | |
612 | return 0; | |
613 | } | |
614 | ||
615 | /* | |
616 | * dtls1_max_handshake_message_len returns the maximum number of bytes | |
617 | * permitted in a DTLS handshake message for |s|. The minimum is 16KB, but | |
618 | * may be greater if the maximum certificate list size requires it. | |
619 | */ | |
1250f126 | 620 | static unsigned long dtls1_max_handshake_message_len(const SSL *s) |
0f113f3e MC |
621 | { |
622 | unsigned long max_len = | |
623 | DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH; | |
624 | if (max_len < (unsigned long)s->max_cert_list) | |
625 | return s->max_cert_list; | |
626 | return max_len; | |
627 | } | |
36d16f8e | 628 | |
934e22e8 | 629 | static int |
0f113f3e MC |
630 | dtls1_reassemble_fragment(SSL *s, const struct hm_header_st *msg_hdr, int *ok) |
631 | { | |
632 | hm_fragment *frag = NULL; | |
633 | pitem *item = NULL; | |
634 | int i = -1, is_complete; | |
635 | unsigned char seq64be[8]; | |
636 | unsigned long frag_len = msg_hdr->frag_len; | |
637 | ||
638 | if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len || | |
639 | msg_hdr->msg_len > dtls1_max_handshake_message_len(s)) | |
640 | goto err; | |
641 | ||
642 | if (frag_len == 0) | |
643 | return DTLS1_HM_FRAGMENT_RETRY; | |
644 | ||
645 | /* Try to find item in queue */ | |
646 | memset(seq64be, 0, sizeof(seq64be)); | |
647 | seq64be[6] = (unsigned char)(msg_hdr->seq >> 8); | |
648 | seq64be[7] = (unsigned char)msg_hdr->seq; | |
649 | item = pqueue_find(s->d1->buffered_messages, seq64be); | |
650 | ||
651 | if (item == NULL) { | |
652 | frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1); | |
653 | if (frag == NULL) | |
654 | goto err; | |
655 | memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); | |
656 | frag->msg_header.frag_len = frag->msg_header.msg_len; | |
657 | frag->msg_header.frag_off = 0; | |
658 | } else { | |
659 | frag = (hm_fragment *)item->data; | |
660 | if (frag->msg_header.msg_len != msg_hdr->msg_len) { | |
661 | item = NULL; | |
662 | frag = NULL; | |
663 | goto err; | |
664 | } | |
665 | } | |
666 | ||
667 | /* | |
668 | * If message is already reassembled, this must be a retransmit and can | |
669 | * be dropped. In this case item != NULL and so frag does not need to be | |
670 | * freed. | |
671 | */ | |
672 | if (frag->reassembly == NULL) { | |
673 | unsigned char devnull[256]; | |
674 | ||
675 | while (frag_len) { | |
676 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, | |
677 | devnull, | |
678 | frag_len > | |
679 | sizeof(devnull) ? sizeof(devnull) : | |
680 | frag_len, 0); | |
681 | if (i <= 0) | |
682 | goto err; | |
683 | frag_len -= i; | |
684 | } | |
685 | return DTLS1_HM_FRAGMENT_RETRY; | |
686 | } | |
687 | ||
688 | /* read the body of the fragment (header has already been read */ | |
689 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, | |
690 | frag->fragment + msg_hdr->frag_off, | |
691 | frag_len, 0); | |
692 | if ((unsigned long)i != frag_len) | |
693 | i = -1; | |
694 | if (i <= 0) | |
695 | goto err; | |
696 | ||
697 | RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off, | |
698 | (long)(msg_hdr->frag_off + frag_len)); | |
699 | ||
700 | RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len, | |
701 | is_complete); | |
702 | ||
703 | if (is_complete) { | |
704 | OPENSSL_free(frag->reassembly); | |
705 | frag->reassembly = NULL; | |
706 | } | |
707 | ||
708 | if (item == NULL) { | |
709 | item = pitem_new(seq64be, frag); | |
710 | if (item == NULL) { | |
711 | i = -1; | |
712 | goto err; | |
713 | } | |
714 | ||
715 | item = pqueue_insert(s->d1->buffered_messages, item); | |
716 | /* | |
717 | * pqueue_insert fails iff a duplicate item is inserted. However, | |
718 | * |item| cannot be a duplicate. If it were, |pqueue_find|, above, | |
719 | * would have returned it and control would never have reached this | |
720 | * branch. | |
721 | */ | |
722 | OPENSSL_assert(item != NULL); | |
723 | } | |
724 | ||
725 | return DTLS1_HM_FRAGMENT_RETRY; | |
726 | ||
727 | err: | |
25aaa98a | 728 | if (item == NULL) |
0f113f3e MC |
729 | dtls1_hm_fragment_free(frag); |
730 | *ok = 0; | |
731 | return i; | |
732 | } | |
934e22e8 | 733 | |
36d16f8e | 734 | static int |
0f113f3e MC |
735 | dtls1_process_out_of_seq_message(SSL *s, const struct hm_header_st *msg_hdr, |
736 | int *ok) | |
36d16f8e | 737 | { |
0f113f3e MC |
738 | int i = -1; |
739 | hm_fragment *frag = NULL; | |
740 | pitem *item = NULL; | |
741 | unsigned char seq64be[8]; | |
742 | unsigned long frag_len = msg_hdr->frag_len; | |
743 | ||
744 | if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len) | |
745 | goto err; | |
746 | ||
747 | /* Try to find item in queue, to prevent duplicate entries */ | |
748 | memset(seq64be, 0, sizeof(seq64be)); | |
749 | seq64be[6] = (unsigned char)(msg_hdr->seq >> 8); | |
750 | seq64be[7] = (unsigned char)msg_hdr->seq; | |
751 | item = pqueue_find(s->d1->buffered_messages, seq64be); | |
752 | ||
753 | /* | |
754 | * If we already have an entry and this one is a fragment, don't discard | |
755 | * it and rather try to reassemble it. | |
756 | */ | |
757 | if (item != NULL && frag_len != msg_hdr->msg_len) | |
758 | item = NULL; | |
759 | ||
760 | /* | |
761 | * Discard the message if sequence number was already there, is too far | |
762 | * in the future, already in the queue or if we received a FINISHED | |
763 | * before the SERVER_HELLO, which then must be a stale retransmit. | |
764 | */ | |
765 | if (msg_hdr->seq <= s->d1->handshake_read_seq || | |
766 | msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL || | |
767 | (s->d1->handshake_read_seq == 0 && msg_hdr->type == SSL3_MT_FINISHED)) | |
768 | { | |
769 | unsigned char devnull[256]; | |
770 | ||
771 | while (frag_len) { | |
772 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, | |
773 | devnull, | |
774 | frag_len > | |
775 | sizeof(devnull) ? sizeof(devnull) : | |
776 | frag_len, 0); | |
777 | if (i <= 0) | |
778 | goto err; | |
779 | frag_len -= i; | |
780 | } | |
781 | } else { | |
782 | if (frag_len != msg_hdr->msg_len) | |
783 | return dtls1_reassemble_fragment(s, msg_hdr, ok); | |
784 | ||
785 | if (frag_len > dtls1_max_handshake_message_len(s)) | |
786 | goto err; | |
787 | ||
788 | frag = dtls1_hm_fragment_new(frag_len, 0); | |
789 | if (frag == NULL) | |
790 | goto err; | |
791 | ||
792 | memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); | |
793 | ||
794 | if (frag_len) { | |
795 | /* | |
796 | * read the body of the fragment (header has already been read | |
797 | */ | |
798 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, | |
799 | frag->fragment, frag_len, 0); | |
800 | if ((unsigned long)i != frag_len) | |
801 | i = -1; | |
802 | if (i <= 0) | |
803 | goto err; | |
804 | } | |
805 | ||
806 | item = pitem_new(seq64be, frag); | |
807 | if (item == NULL) | |
808 | goto err; | |
809 | ||
810 | item = pqueue_insert(s->d1->buffered_messages, item); | |
811 | /* | |
812 | * pqueue_insert fails iff a duplicate item is inserted. However, | |
813 | * |item| cannot be a duplicate. If it were, |pqueue_find|, above, | |
814 | * would have returned it. Then, either |frag_len| != | |
815 | * |msg_hdr->msg_len| in which case |item| is set to NULL and it will | |
816 | * have been processed with |dtls1_reassemble_fragment|, above, or | |
817 | * the record will have been discarded. | |
818 | */ | |
819 | OPENSSL_assert(item != NULL); | |
820 | } | |
821 | ||
822 | return DTLS1_HM_FRAGMENT_RETRY; | |
823 | ||
824 | err: | |
25aaa98a | 825 | if (item == NULL) |
0f113f3e MC |
826 | dtls1_hm_fragment_free(frag); |
827 | *ok = 0; | |
828 | return i; | |
829 | } | |
36d16f8e | 830 | |
beb056b3 | 831 | static long |
36d16f8e | 832 | dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok) |
0f113f3e MC |
833 | { |
834 | unsigned char wire[DTLS1_HM_HEADER_LENGTH]; | |
835 | unsigned long len, frag_off, frag_len; | |
836 | int i, al; | |
837 | struct hm_header_st msg_hdr; | |
838 | ||
839 | redo: | |
840 | /* see if we have the required fragment already */ | |
841 | if ((frag_len = dtls1_retrieve_buffered_fragment(s, max, ok)) || *ok) { | |
842 | if (*ok) | |
843 | s->init_num = frag_len; | |
844 | return frag_len; | |
845 | } | |
846 | ||
847 | /* read handshake message header */ | |
848 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, wire, | |
849 | DTLS1_HM_HEADER_LENGTH, 0); | |
850 | if (i <= 0) { /* nbio, or an error */ | |
851 | s->rwstate = SSL_READING; | |
852 | *ok = 0; | |
853 | return i; | |
854 | } | |
855 | /* Handshake fails if message header is incomplete */ | |
856 | if (i != DTLS1_HM_HEADER_LENGTH) { | |
857 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
858 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT, SSL_R_UNEXPECTED_MESSAGE); | |
859 | goto f_err; | |
860 | } | |
861 | ||
862 | /* parse the message fragment header */ | |
863 | dtls1_get_message_header(wire, &msg_hdr); | |
864 | ||
865 | /* | |
866 | * if this is a future (or stale) message it gets buffered | |
867 | * (or dropped)--no further processing at this time | |
868 | * While listening, we accept seq 1 (ClientHello with cookie) | |
869 | * although we're still expecting seq 0 (ClientHello) | |
870 | */ | |
871 | if (msg_hdr.seq != s->d1->handshake_read_seq | |
872 | && !(s->d1->listen && msg_hdr.seq == 1)) | |
873 | return dtls1_process_out_of_seq_message(s, &msg_hdr, ok); | |
874 | ||
875 | len = msg_hdr.msg_len; | |
876 | frag_off = msg_hdr.frag_off; | |
877 | frag_len = msg_hdr.frag_len; | |
878 | ||
879 | if (frag_len && frag_len < len) | |
880 | return dtls1_reassemble_fragment(s, &msg_hdr, ok); | |
881 | ||
882 | if (!s->server && s->d1->r_msg_hdr.frag_off == 0 && | |
883 | wire[0] == SSL3_MT_HELLO_REQUEST) { | |
884 | /* | |
885 | * The server may always send 'Hello Request' messages -- we are | |
886 | * doing a handshake anyway now, so ignore them if their format is | |
887 | * correct. Does not count for 'Finished' MAC. | |
888 | */ | |
889 | if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) { | |
890 | if (s->msg_callback) | |
891 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
892 | wire, DTLS1_HM_HEADER_LENGTH, s, | |
893 | s->msg_callback_arg); | |
894 | ||
895 | s->init_num = 0; | |
896 | goto redo; | |
897 | } else { /* Incorrectly formated Hello request */ | |
898 | ||
899 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
900 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT, | |
901 | SSL_R_UNEXPECTED_MESSAGE); | |
902 | goto f_err; | |
903 | } | |
904 | } | |
905 | ||
906 | if ((al = dtls1_preprocess_fragment(s, &msg_hdr, max))) | |
907 | goto f_err; | |
908 | ||
909 | /* XDTLS: ressurect this when restart is in place */ | |
910 | s->state = stn; | |
911 | ||
912 | if (frag_len > 0) { | |
913 | unsigned char *p = | |
914 | (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
915 | ||
916 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, | |
917 | &p[frag_off], frag_len, 0); | |
918 | /* | |
919 | * XDTLS: fix this--message fragments cannot span multiple packets | |
920 | */ | |
921 | if (i <= 0) { | |
922 | s->rwstate = SSL_READING; | |
923 | *ok = 0; | |
924 | return i; | |
925 | } | |
926 | } else | |
927 | i = 0; | |
928 | ||
929 | /* | |
930 | * XDTLS: an incorrectly formatted fragment should cause the handshake | |
931 | * to fail | |
932 | */ | |
933 | if (i != (int)frag_len) { | |
934 | al = SSL3_AD_ILLEGAL_PARAMETER; | |
935 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT, SSL3_AD_ILLEGAL_PARAMETER); | |
936 | goto f_err; | |
937 | } | |
938 | ||
939 | *ok = 1; | |
940 | ||
941 | /* | |
942 | * Note that s->init_num is *not* used as current offset in | |
943 | * s->init_buf->data, but as a counter summing up fragments' lengths: as | |
944 | * soon as they sum up to handshake packet length, we assume we have got | |
945 | * all the fragments. | |
946 | */ | |
947 | s->init_num = frag_len; | |
948 | return frag_len; | |
949 | ||
950 | f_err: | |
951 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
952 | s->init_num = 0; | |
953 | ||
954 | *ok = 0; | |
955 | return (-1); | |
956 | } | |
36d16f8e | 957 | |
1d97c843 TH |
958 | /*- |
959 | * for these 2 messages, we need to | |
0f113f3e | 960 | * ssl->enc_read_ctx re-init |
de07f311 | 961 | * ssl->rlayer.read_sequence zero |
0f113f3e MC |
962 | * ssl->s3->read_mac_secret re-init |
963 | * ssl->session->read_sym_enc assign | |
964 | * ssl->session->read_compression assign | |
965 | * ssl->session->read_hash assign | |
36d16f8e BL |
966 | */ |
967 | int dtls1_send_change_cipher_spec(SSL *s, int a, int b) | |
0f113f3e MC |
968 | { |
969 | unsigned char *p; | |
36d16f8e | 970 | |
0f113f3e MC |
971 | if (s->state == a) { |
972 | p = (unsigned char *)s->init_buf->data; | |
973 | *p++ = SSL3_MT_CCS; | |
974 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
975 | s->init_num = DTLS1_CCS_HEADER_LENGTH; | |
8711efb4 | 976 | |
0f113f3e MC |
977 | if (s->version == DTLS1_BAD_VER) { |
978 | s->d1->next_handshake_write_seq++; | |
979 | s2n(s->d1->handshake_write_seq, p); | |
980 | s->init_num += 2; | |
981 | } | |
8711efb4 | 982 | |
0f113f3e | 983 | s->init_off = 0; |
36d16f8e | 984 | |
0f113f3e MC |
985 | dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, |
986 | s->d1->handshake_write_seq, 0, 0); | |
36d16f8e | 987 | |
0f113f3e | 988 | /* buffer the message to handle re-xmits */ |
61986d32 | 989 | if (!dtls1_buffer_message(s, 1)) { |
69f68237 MC |
990 | SSLerr(SSL_F_DTLS1_SEND_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); |
991 | return -1; | |
992 | } | |
36d16f8e | 993 | |
0f113f3e MC |
994 | s->state = b; |
995 | } | |
36d16f8e | 996 | |
0f113f3e MC |
997 | /* SSL3_ST_CW_CHANGE_B */ |
998 | return (dtls1_do_write(s, SSL3_RT_CHANGE_CIPHER_SPEC)); | |
999 | } | |
36d16f8e | 1000 | |
36d16f8e | 1001 | int dtls1_read_failed(SSL *s, int code) |
0f113f3e MC |
1002 | { |
1003 | if (code > 0) { | |
1004 | fprintf(stderr, "invalid state reached %s:%d", __FILE__, __LINE__); | |
1005 | return 1; | |
1006 | } | |
1007 | ||
1008 | if (!dtls1_is_timer_expired(s)) { | |
1009 | /* | |
1010 | * not a timeout, none of our business, let higher layers handle | |
1011 | * this. in fact it's probably an error | |
1012 | */ | |
1013 | return code; | |
1014 | } | |
4817504d | 1015 | #ifndef OPENSSL_NO_HEARTBEATS |
0f113f3e MC |
1016 | /* done, no need to send a retransmit */ |
1017 | if (!SSL_in_init(s) && !s->tlsext_hb_pending) | |
4817504d | 1018 | #else |
0f113f3e MC |
1019 | /* done, no need to send a retransmit */ |
1020 | if (!SSL_in_init(s)) | |
4817504d | 1021 | #endif |
0f113f3e MC |
1022 | { |
1023 | BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ); | |
1024 | return code; | |
1025 | } | |
36d16f8e | 1026 | |
0f113f3e MC |
1027 | return dtls1_handle_timeout(s); |
1028 | } | |
36d16f8e | 1029 | |
0f113f3e MC |
1030 | int dtls1_get_queue_priority(unsigned short seq, int is_ccs) |
1031 | { | |
1032 | /* | |
1033 | * The index of the retransmission queue actually is the message sequence | |
1034 | * number, since the queue only contains messages of a single handshake. | |
1035 | * However, the ChangeCipherSpec has no message sequence number and so | |
1036 | * using only the sequence will result in the CCS and Finished having the | |
1037 | * same index. To prevent this, the sequence number is multiplied by 2. | |
1038 | * In case of a CCS 1 is subtracted. This does not only differ CSS and | |
1039 | * Finished, it also maintains the order of the index (important for | |
1040 | * priority queues) and fits in the unsigned short variable. | |
1041 | */ | |
1042 | return seq * 2 - is_ccs; | |
1043 | } | |
36d16f8e | 1044 | |
0f113f3e MC |
1045 | int dtls1_retransmit_buffered_messages(SSL *s) |
1046 | { | |
1047 | pqueue sent = s->d1->sent_messages; | |
1048 | piterator iter; | |
1049 | pitem *item; | |
1050 | hm_fragment *frag; | |
1051 | int found = 0; | |
1052 | ||
1053 | iter = pqueue_iterator(sent); | |
1054 | ||
1055 | for (item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter)) { | |
1056 | frag = (hm_fragment *)item->data; | |
1057 | if (dtls1_retransmit_message(s, (unsigned short) | |
1058 | dtls1_get_queue_priority | |
1059 | (frag->msg_header.seq, | |
1060 | frag->msg_header.is_ccs), 0, | |
1061 | &found) <= 0 && found) { | |
1062 | fprintf(stderr, "dtls1_retransmit_message() failed\n"); | |
1063 | return -1; | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | return 1; | |
1068 | } | |
36d16f8e | 1069 | |
0f113f3e MC |
1070 | int dtls1_buffer_message(SSL *s, int is_ccs) |
1071 | { | |
1072 | pitem *item; | |
1073 | hm_fragment *frag; | |
1074 | unsigned char seq64be[8]; | |
1075 | ||
1076 | /* | |
1077 | * this function is called immediately after a message has been | |
1078 | * serialized | |
1079 | */ | |
1080 | OPENSSL_assert(s->init_off == 0); | |
1081 | ||
1082 | frag = dtls1_hm_fragment_new(s->init_num, 0); | |
1083 | if (!frag) | |
1084 | return 0; | |
1085 | ||
1086 | memcpy(frag->fragment, s->init_buf->data, s->init_num); | |
1087 | ||
1088 | if (is_ccs) { | |
5178a16c | 1089 | /* For DTLS1_BAD_VER the header length is non-standard */ |
0f113f3e | 1090 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + |
5178a16c MC |
1091 | ((s->version==DTLS1_BAD_VER)?3:DTLS1_CCS_HEADER_LENGTH) |
1092 | == (unsigned int)s->init_num); | |
0f113f3e MC |
1093 | } else { |
1094 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + | |
1095 | DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num); | |
1096 | } | |
1097 | ||
1098 | frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len; | |
1099 | frag->msg_header.seq = s->d1->w_msg_hdr.seq; | |
1100 | frag->msg_header.type = s->d1->w_msg_hdr.type; | |
1101 | frag->msg_header.frag_off = 0; | |
1102 | frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len; | |
1103 | frag->msg_header.is_ccs = is_ccs; | |
1104 | ||
1105 | /* save current state */ | |
1106 | frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx; | |
1107 | frag->msg_header.saved_retransmit_state.write_hash = s->write_hash; | |
1108 | frag->msg_header.saved_retransmit_state.compress = s->compress; | |
1109 | frag->msg_header.saved_retransmit_state.session = s->session; | |
78a39fe7 MC |
1110 | frag->msg_header.saved_retransmit_state.epoch = |
1111 | DTLS_RECORD_LAYER_get_w_epoch(&s->rlayer); | |
0f113f3e MC |
1112 | |
1113 | memset(seq64be, 0, sizeof(seq64be)); | |
1114 | seq64be[6] = | |
1115 | (unsigned | |
1116 | char)(dtls1_get_queue_priority(frag->msg_header.seq, | |
1117 | frag->msg_header.is_ccs) >> 8); | |
1118 | seq64be[7] = | |
1119 | (unsigned | |
1120 | char)(dtls1_get_queue_priority(frag->msg_header.seq, | |
1121 | frag->msg_header.is_ccs)); | |
1122 | ||
1123 | item = pitem_new(seq64be, frag); | |
1124 | if (item == NULL) { | |
1125 | dtls1_hm_fragment_free(frag); | |
1126 | return 0; | |
1127 | } | |
36d16f8e | 1128 | |
0f113f3e MC |
1129 | pqueue_insert(s->d1->sent_messages, item); |
1130 | return 1; | |
1131 | } | |
36d16f8e BL |
1132 | |
1133 | int | |
1134 | dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off, | |
0f113f3e MC |
1135 | int *found) |
1136 | { | |
1137 | int ret; | |
1138 | /* XDTLS: for now assuming that read/writes are blocking */ | |
1139 | pitem *item; | |
1140 | hm_fragment *frag; | |
1141 | unsigned long header_length; | |
1142 | unsigned char seq64be[8]; | |
1143 | struct dtls1_retransmit_state saved_state; | |
0f113f3e | 1144 | |
50e735f9 MC |
1145 | /*- |
1146 | OPENSSL_assert(s->init_num == 0); | |
1147 | OPENSSL_assert(s->init_off == 0); | |
1148 | */ | |
0f113f3e MC |
1149 | |
1150 | /* XDTLS: the requested message ought to be found, otherwise error */ | |
1151 | memset(seq64be, 0, sizeof(seq64be)); | |
1152 | seq64be[6] = (unsigned char)(seq >> 8); | |
1153 | seq64be[7] = (unsigned char)seq; | |
1154 | ||
1155 | item = pqueue_find(s->d1->sent_messages, seq64be); | |
1156 | if (item == NULL) { | |
1157 | fprintf(stderr, "retransmit: message %d non-existant\n", seq); | |
1158 | *found = 0; | |
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | *found = 1; | |
1163 | frag = (hm_fragment *)item->data; | |
1164 | ||
1165 | if (frag->msg_header.is_ccs) | |
1166 | header_length = DTLS1_CCS_HEADER_LENGTH; | |
1167 | else | |
1168 | header_length = DTLS1_HM_HEADER_LENGTH; | |
1169 | ||
1170 | memcpy(s->init_buf->data, frag->fragment, | |
1171 | frag->msg_header.msg_len + header_length); | |
1172 | s->init_num = frag->msg_header.msg_len + header_length; | |
1173 | ||
1174 | dtls1_set_message_header_int(s, frag->msg_header.type, | |
1175 | frag->msg_header.msg_len, | |
1176 | frag->msg_header.seq, 0, | |
1177 | frag->msg_header.frag_len); | |
1178 | ||
1179 | /* save current state */ | |
1180 | saved_state.enc_write_ctx = s->enc_write_ctx; | |
1181 | saved_state.write_hash = s->write_hash; | |
1182 | saved_state.compress = s->compress; | |
1183 | saved_state.session = s->session; | |
78a39fe7 | 1184 | saved_state.epoch = DTLS_RECORD_LAYER_get_w_epoch(&s->rlayer); |
0f113f3e MC |
1185 | |
1186 | s->d1->retransmitting = 1; | |
1187 | ||
1188 | /* restore state in which the message was originally sent */ | |
1189 | s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx; | |
1190 | s->write_hash = frag->msg_header.saved_retransmit_state.write_hash; | |
1191 | s->compress = frag->msg_header.saved_retransmit_state.compress; | |
1192 | s->session = frag->msg_header.saved_retransmit_state.session; | |
3bb8f87d | 1193 | DTLS_RECORD_LAYER_set_saved_w_epoch(&s->rlayer, |
78a39fe7 | 1194 | frag->msg_header.saved_retransmit_state.epoch); |
0f113f3e | 1195 | |
0f113f3e MC |
1196 | ret = dtls1_do_write(s, frag->msg_header.is_ccs ? |
1197 | SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE); | |
1198 | ||
1199 | /* restore current state */ | |
1200 | s->enc_write_ctx = saved_state.enc_write_ctx; | |
1201 | s->write_hash = saved_state.write_hash; | |
1202 | s->compress = saved_state.compress; | |
1203 | s->session = saved_state.session; | |
3bb8f87d | 1204 | DTLS_RECORD_LAYER_set_saved_w_epoch(&s->rlayer, saved_state.epoch); |
0f113f3e MC |
1205 | |
1206 | s->d1->retransmitting = 0; | |
1207 | ||
1208 | (void)BIO_flush(SSL_get_wbio(s)); | |
1209 | return ret; | |
1210 | } | |
36d16f8e BL |
1211 | |
1212 | /* call this function when the buffered messages are no longer needed */ | |
0f113f3e MC |
1213 | void dtls1_clear_record_buffer(SSL *s) |
1214 | { | |
1215 | pitem *item; | |
36d16f8e | 1216 | |
0f113f3e MC |
1217 | for (item = pqueue_pop(s->d1->sent_messages); |
1218 | item != NULL; item = pqueue_pop(s->d1->sent_messages)) { | |
1219 | dtls1_hm_fragment_free((hm_fragment *)item->data); | |
1220 | pitem_free(item); | |
1221 | } | |
1222 | } | |
54ef01b5 | 1223 | |
69f68237 | 1224 | void dtls1_set_message_header(SSL *s, unsigned char *p, |
0f113f3e MC |
1225 | unsigned char mt, unsigned long len, |
1226 | unsigned long frag_off, | |
1227 | unsigned long frag_len) | |
1228 | { | |
1229 | /* Don't change sequence numbers while listening */ | |
1230 | if (frag_off == 0 && !s->d1->listen) { | |
1231 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
1232 | s->d1->next_handshake_write_seq++; | |
1233 | } | |
54ef01b5 | 1234 | |
0f113f3e MC |
1235 | dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq, |
1236 | frag_off, frag_len); | |
0f113f3e | 1237 | } |
36d16f8e BL |
1238 | |
1239 | /* don't actually do the writing, wait till the MTU has been retrieved */ | |
1240 | static void | |
1241 | dtls1_set_message_header_int(SSL *s, unsigned char mt, | |
0f113f3e MC |
1242 | unsigned long len, unsigned short seq_num, |
1243 | unsigned long frag_off, unsigned long frag_len) | |
1244 | { | |
1245 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1246 | ||
1247 | msg_hdr->type = mt; | |
1248 | msg_hdr->msg_len = len; | |
1249 | msg_hdr->seq = seq_num; | |
1250 | msg_hdr->frag_off = frag_off; | |
1251 | msg_hdr->frag_len = frag_len; | |
1252 | } | |
36d16f8e BL |
1253 | |
1254 | static void | |
1255 | dtls1_fix_message_header(SSL *s, unsigned long frag_off, | |
0f113f3e MC |
1256 | unsigned long frag_len) |
1257 | { | |
1258 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
36d16f8e | 1259 | |
0f113f3e MC |
1260 | msg_hdr->frag_off = frag_off; |
1261 | msg_hdr->frag_len = frag_len; | |
1262 | } | |
54ef01b5 | 1263 | |
0f113f3e MC |
1264 | static unsigned char *dtls1_write_message_header(SSL *s, unsigned char *p) |
1265 | { | |
1266 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
54ef01b5 | 1267 | |
0f113f3e MC |
1268 | *p++ = msg_hdr->type; |
1269 | l2n3(msg_hdr->msg_len, p); | |
54ef01b5 | 1270 | |
0f113f3e MC |
1271 | s2n(msg_hdr->seq, p); |
1272 | l2n3(msg_hdr->frag_off, p); | |
1273 | l2n3(msg_hdr->frag_len, p); | |
36d16f8e | 1274 | |
0f113f3e MC |
1275 | return p; |
1276 | } | |
36d16f8e | 1277 | |
0f113f3e MC |
1278 | unsigned int dtls1_link_min_mtu(void) |
1279 | { | |
1280 | return (g_probable_mtu[(sizeof(g_probable_mtu) / | |
1281 | sizeof(g_probable_mtu[0])) - 1]); | |
1282 | } | |
36d16f8e | 1283 | |
0f113f3e MC |
1284 | unsigned int dtls1_min_mtu(SSL *s) |
1285 | { | |
1286 | return dtls1_link_min_mtu() - BIO_dgram_get_mtu_overhead(SSL_get_wbio(s)); | |
1287 | } | |
36d16f8e BL |
1288 | |
1289 | void | |
1290 | dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr) | |
0f113f3e MC |
1291 | { |
1292 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
1293 | msg_hdr->type = *(data++); | |
1294 | n2l3(data, msg_hdr->msg_len); | |
54ef01b5 | 1295 | |
0f113f3e MC |
1296 | n2s(data, msg_hdr->seq); |
1297 | n2l3(data, msg_hdr->frag_off); | |
1298 | n2l3(data, msg_hdr->frag_len); | |
1299 | } | |
36d16f8e | 1300 | |
0f113f3e MC |
1301 | void dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr) |
1302 | { | |
1303 | memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st)); | |
54ef01b5 | 1304 | |
0f113f3e MC |
1305 | ccs_hdr->type = *(data++); |
1306 | } | |
7e159e01 DSH |
1307 | |
1308 | int dtls1_shutdown(SSL *s) | |
0f113f3e MC |
1309 | { |
1310 | int ret; | |
7e159e01 | 1311 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
1312 | if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && |
1313 | !(s->shutdown & SSL_SENT_SHUTDOWN)) { | |
1314 | ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); | |
1315 | if (ret < 0) | |
1316 | return -1; | |
1317 | ||
1318 | if (ret == 0) | |
1319 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 1, | |
1320 | NULL); | |
1321 | } | |
7e159e01 | 1322 | #endif |
0f113f3e | 1323 | ret = ssl3_shutdown(s); |
7e159e01 | 1324 | #ifndef OPENSSL_NO_SCTP |
0f113f3e | 1325 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 0, NULL); |
7e159e01 | 1326 | #endif |
0f113f3e MC |
1327 | return ret; |
1328 | } | |
4817504d DSH |
1329 | |
1330 | #ifndef OPENSSL_NO_HEARTBEATS | |
2c60ed04 | 1331 | int dtls1_process_heartbeat(SSL *s, unsigned char *p, unsigned int length) |
0f113f3e | 1332 | { |
2c60ed04 | 1333 | unsigned char *pl; |
0f113f3e MC |
1334 | unsigned short hbtype; |
1335 | unsigned int payload; | |
1336 | unsigned int padding = 16; /* Use minimum padding */ | |
1337 | ||
1338 | if (s->msg_callback) | |
1339 | s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT, | |
258f8721 | 1340 | p, length, s, s->msg_callback_arg); |
0f113f3e MC |
1341 | |
1342 | /* Read type and payload length first */ | |
258f8721 | 1343 | if (1 + 2 + 16 > length) |
0f113f3e | 1344 | return 0; /* silently discard */ |
258f8721 | 1345 | if (length > SSL3_RT_MAX_PLAIN_LENGTH) |
0f113f3e MC |
1346 | return 0; /* silently discard per RFC 6520 sec. 4 */ |
1347 | ||
1348 | hbtype = *p++; | |
1349 | n2s(p, payload); | |
258f8721 | 1350 | if (1 + 2 + payload + 16 > length) |
0f113f3e MC |
1351 | return 0; /* silently discard per RFC 6520 sec. 4 */ |
1352 | pl = p; | |
1353 | ||
1354 | if (hbtype == TLS1_HB_REQUEST) { | |
1355 | unsigned char *buffer, *bp; | |
1356 | unsigned int write_length = 1 /* heartbeat type */ + | |
1357 | 2 /* heartbeat length */ + | |
1358 | payload + padding; | |
1359 | int r; | |
1360 | ||
1361 | if (write_length > SSL3_RT_MAX_PLAIN_LENGTH) | |
1362 | return 0; | |
1363 | ||
1364 | /* | |
1365 | * Allocate memory for the response, size is 1 byte message type, | |
1366 | * plus 2 bytes payload length, plus payload, plus padding | |
1367 | */ | |
1368 | buffer = OPENSSL_malloc(write_length); | |
1369 | if (buffer == NULL) | |
1370 | return -1; | |
1371 | bp = buffer; | |
1372 | ||
1373 | /* Enter response type, length and copy payload */ | |
1374 | *bp++ = TLS1_HB_RESPONSE; | |
1375 | s2n(payload, bp); | |
1376 | memcpy(bp, pl, payload); | |
1377 | bp += payload; | |
1378 | /* Random padding */ | |
266483d2 MC |
1379 | if (RAND_bytes(bp, padding) <= 0) { |
1380 | OPENSSL_free(buffer); | |
1381 | return -1; | |
1382 | } | |
0f113f3e MC |
1383 | |
1384 | r = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, write_length); | |
1385 | ||
1386 | if (r >= 0 && s->msg_callback) | |
1387 | s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT, | |
1388 | buffer, write_length, s, s->msg_callback_arg); | |
1389 | ||
1390 | OPENSSL_free(buffer); | |
1391 | ||
1392 | if (r < 0) | |
1393 | return r; | |
1394 | } else if (hbtype == TLS1_HB_RESPONSE) { | |
1395 | unsigned int seq; | |
1396 | ||
1397 | /* | |
1398 | * We only send sequence numbers (2 bytes unsigned int), and 16 | |
1399 | * random bytes, so we just try to read the sequence number | |
1400 | */ | |
1401 | n2s(pl, seq); | |
1402 | ||
1403 | if (payload == 18 && seq == s->tlsext_hb_seq) { | |
1404 | dtls1_stop_timer(s); | |
1405 | s->tlsext_hb_seq++; | |
1406 | s->tlsext_hb_pending = 0; | |
1407 | } | |
1408 | } | |
1409 | ||
1410 | return 0; | |
1411 | } | |
4817504d | 1412 | |
0f113f3e MC |
1413 | int dtls1_heartbeat(SSL *s) |
1414 | { | |
1415 | unsigned char *buf, *p; | |
266483d2 | 1416 | int ret = -1; |
0f113f3e MC |
1417 | unsigned int payload = 18; /* Sequence number + random bytes */ |
1418 | unsigned int padding = 16; /* Use minimum padding */ | |
1419 | ||
1420 | /* Only send if peer supports and accepts HB requests... */ | |
1421 | if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) || | |
1422 | s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS) { | |
1423 | SSLerr(SSL_F_DTLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT); | |
1424 | return -1; | |
1425 | } | |
1426 | ||
1427 | /* ...and there is none in flight yet... */ | |
1428 | if (s->tlsext_hb_pending) { | |
1429 | SSLerr(SSL_F_DTLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PENDING); | |
1430 | return -1; | |
1431 | } | |
1432 | ||
1433 | /* ...and no handshake in progress. */ | |
1434 | if (SSL_in_init(s) || s->in_handshake) { | |
1435 | SSLerr(SSL_F_DTLS1_HEARTBEAT, SSL_R_UNEXPECTED_MESSAGE); | |
1436 | return -1; | |
1437 | } | |
1438 | ||
1439 | /* | |
1440 | * Check if padding is too long, payload and padding must not exceed 2^14 | |
1441 | * - 3 = 16381 bytes in total. | |
1442 | */ | |
1443 | OPENSSL_assert(payload + padding <= 16381); | |
1444 | ||
50e735f9 MC |
1445 | /*- |
1446 | * Create HeartBeat message, we just use a sequence number | |
1447 | * as payload to distuingish different messages and add | |
1448 | * some random stuff. | |
1449 | * - Message Type, 1 byte | |
1450 | * - Payload Length, 2 bytes (unsigned int) | |
1451 | * - Payload, the sequence number (2 bytes uint) | |
1452 | * - Payload, random bytes (16 bytes uint) | |
1453 | * - Padding | |
1454 | */ | |
0f113f3e MC |
1455 | buf = OPENSSL_malloc(1 + 2 + payload + padding); |
1456 | if (buf == NULL) { | |
1457 | SSLerr(SSL_F_DTLS1_HEARTBEAT, ERR_R_MALLOC_FAILURE); | |
1458 | return -1; | |
1459 | } | |
1460 | p = buf; | |
1461 | /* Message Type */ | |
1462 | *p++ = TLS1_HB_REQUEST; | |
1463 | /* Payload length (18 bytes here) */ | |
1464 | s2n(payload, p); | |
1465 | /* Sequence number */ | |
1466 | s2n(s->tlsext_hb_seq, p); | |
1467 | /* 16 random bytes */ | |
266483d2 MC |
1468 | if (RAND_bytes(p, 16) <= 0) { |
1469 | SSLerr(SSL_F_DTLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR); | |
1470 | goto err; | |
1471 | } | |
0f113f3e MC |
1472 | p += 16; |
1473 | /* Random padding */ | |
266483d2 MC |
1474 | if (RAND_bytes(p, padding) <= 0) { |
1475 | SSLerr(SSL_F_DTLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR); | |
1476 | goto err; | |
1477 | } | |
0f113f3e MC |
1478 | |
1479 | ret = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding); | |
1480 | if (ret >= 0) { | |
1481 | if (s->msg_callback) | |
1482 | s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT, | |
1483 | buf, 3 + payload + padding, | |
1484 | s, s->msg_callback_arg); | |
1485 | ||
1486 | dtls1_start_timer(s); | |
1487 | s->tlsext_hb_pending = 1; | |
1488 | } | |
1489 | ||
266483d2 | 1490 | err: |
0f113f3e MC |
1491 | OPENSSL_free(buf); |
1492 | ||
1493 | return ret; | |
1494 | } | |
4817504d | 1495 | #endif |