]>
Commit | Line | Data |
---|---|---|
36d16f8e BL |
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 | |
90acf770 | 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. | |
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 | |
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 :-). | |
36d16f8e | 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)" | |
36d16f8e BL |
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 | ||
1507f3ab DSH |
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) { \ | |
8c1e7de6 | 130 | long ii; \ |
1507f3ab DSH |
131 | for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \ |
132 | } else { \ | |
8c1e7de6 | 133 | long ii; \ |
1507f3ab | 134 | bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \ |
8c1e7de6 DSH |
135 | for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \ |
136 | bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \ | |
1507f3ab DSH |
137 | } } |
138 | ||
139 | #define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \ | |
8c1e7de6 DSH |
140 | long ii; \ |
141 | OPENSSL_assert((msg_len) > 0); \ | |
1507f3ab | 142 | is_complete = 1; \ |
8c1e7de6 DSH |
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; } } | |
1507f3ab DSH |
146 | |
147 | #if 0 | |
148 | #define RSMBLY_BITMASK_PRINT(bitmask, msg_len) { \ | |
8c1e7de6 | 149 | long ii; \ |
1507f3ab DSH |
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}; | |
f5dac77c | 156 | static unsigned char bitmask_end_values[] = {0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f}; |
36d16f8e BL |
157 | |
158 | /* XDTLS: figure out the right values */ | |
159 | static unsigned int g_probable_mtu[] = {1500 - 28, 512 - 28, 256 - 28}; | |
160 | ||
36d16f8e BL |
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); | |
36d16f8e | 169 | static long dtls1_get_message_fragment(SSL *s, int st1, int stn, |
54ef01b5 | 170 | long max, int *ok); |
36d16f8e BL |
171 | |
172 | static hm_fragment * | |
1507f3ab | 173 | dtls1_hm_fragment_new(unsigned long frag_len, int reassembly) |
54ef01b5 AP |
174 | { |
175 | hm_fragment *frag = NULL; | |
176 | unsigned char *buf = NULL; | |
1507f3ab | 177 | unsigned char *bitmask = NULL; |
54ef01b5 AP |
178 | |
179 | frag = (hm_fragment *)OPENSSL_malloc(sizeof(hm_fragment)); | |
180 | if ( frag == NULL) | |
181 | return NULL; | |
182 | ||
90acf770 | 183 | if (frag_len) |
54ef01b5 | 184 | { |
90acf770 AP |
185 | buf = (unsigned char *)OPENSSL_malloc(frag_len); |
186 | if ( buf == NULL) | |
187 | { | |
188 | OPENSSL_free(frag); | |
189 | return NULL; | |
190 | } | |
54ef01b5 AP |
191 | } |
192 | ||
90acf770 | 193 | /* zero length fragment gets zero frag->fragment */ |
54ef01b5 AP |
194 | frag->fragment = buf; |
195 | ||
1507f3ab DSH |
196 | /* Initialize reassembly bitmask if necessary */ |
197 | if (reassembly) | |
198 | { | |
199 | bitmask = (unsigned char *)OPENSSL_malloc(RSMBLY_BITMASK_SIZE(frag_len)); | |
200 | if (bitmask == NULL) | |
201 | { | |
202 | if (buf != NULL) OPENSSL_free(buf); | |
203 | OPENSSL_free(frag); | |
204 | return NULL; | |
205 | } | |
206 | memset(bitmask, 0, RSMBLY_BITMASK_SIZE(frag_len)); | |
207 | } | |
208 | ||
209 | frag->reassembly = bitmask; | |
210 | ||
54ef01b5 AP |
211 | return frag; |
212 | } | |
36d16f8e BL |
213 | |
214 | static void | |
215 | dtls1_hm_fragment_free(hm_fragment *frag) | |
54ef01b5 | 216 | { |
2d64b51d DSH |
217 | |
218 | if (frag->msg_header.is_ccs) | |
219 | { | |
220 | EVP_CIPHER_CTX_free(frag->msg_header.saved_retransmit_state.enc_write_ctx); | |
221 | EVP_MD_CTX_destroy(frag->msg_header.saved_retransmit_state.write_hash); | |
222 | } | |
90acf770 | 223 | if (frag->fragment) OPENSSL_free(frag->fragment); |
1507f3ab | 224 | if (frag->reassembly) OPENSSL_free(frag->reassembly); |
54ef01b5 AP |
225 | OPENSSL_free(frag); |
226 | } | |
36d16f8e BL |
227 | |
228 | /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */ | |
229 | int dtls1_do_write(SSL *s, int type) | |
230 | { | |
231 | int ret; | |
232 | int curr_mtu; | |
23b97c6b | 233 | unsigned int len, frag_off, mac_size, blocksize; |
36d16f8e BL |
234 | |
235 | /* AHA! Figure out the MTU, and stick to the right size */ | |
f4f512a8 | 236 | if (s->d1->mtu < dtls1_min_mtu() && !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) |
54ef01b5 | 237 | { |
36d16f8e BL |
238 | s->d1->mtu = |
239 | 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 */ | |
f4f512a8 | 243 | if (s->d1->mtu < dtls1_min_mtu()) |
36d16f8e BL |
244 | { |
245 | s->d1->mtu = 0; | |
246 | s->d1->mtu = dtls1_guess_mtu(s->d1->mtu); | |
247 | 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; | |
54ef01b5 | 264 | |
36d16f8e BL |
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 | } | |
36d16f8e BL |
272 | #endif |
273 | ||
8f096885 DSH |
274 | OPENSSL_assert(s->d1->mtu >= dtls1_min_mtu()); /* should have something reasonable now */ |
275 | ||
36d16f8e BL |
276 | if ( s->init_off == 0 && type == SSL3_RT_HANDSHAKE) |
277 | OPENSSL_assert(s->init_num == | |
6c61726b | 278 | (int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH); |
36d16f8e | 279 | |
23b97c6b DSH |
280 | if (s->write_hash) |
281 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
282 | else | |
283 | mac_size = 0; | |
284 | ||
285 | if (s->enc_write_ctx && | |
286 | (EVP_CIPHER_mode( s->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE)) | |
287 | blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher); | |
288 | else | |
289 | blocksize = 0; | |
290 | ||
36d16f8e BL |
291 | frag_off = 0; |
292 | while( s->init_num) | |
293 | { | |
294 | curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) - | |
23b97c6b | 295 | DTLS1_RT_HEADER_LENGTH - mac_size - blocksize; |
36d16f8e BL |
296 | |
297 | if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH) | |
298 | { | |
299 | /* grr.. we could get an error if MTU picked was wrong */ | |
300 | ret = BIO_flush(SSL_get_wbio(s)); | |
301 | if ( ret <= 0) | |
302 | return ret; | |
23b97c6b DSH |
303 | curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH - |
304 | mac_size - blocksize; | |
36d16f8e BL |
305 | } |
306 | ||
307 | if ( s->init_num > curr_mtu) | |
308 | len = curr_mtu; | |
309 | else | |
310 | len = s->init_num; | |
311 | ||
312 | ||
313 | /* XDTLS: this function is too long. split out the CCS part */ | |
314 | if ( type == SSL3_RT_HANDSHAKE) | |
315 | { | |
316 | if ( s->init_off != 0) | |
317 | { | |
318 | OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH); | |
319 | s->init_off -= DTLS1_HM_HEADER_LENGTH; | |
320 | s->init_num += DTLS1_HM_HEADER_LENGTH; | |
321 | ||
a1a45c59 MT |
322 | if ( s->init_num > curr_mtu) |
323 | len = curr_mtu; | |
324 | else | |
325 | len = s->init_num; | |
36d16f8e | 326 | } |
54ef01b5 | 327 | |
36d16f8e BL |
328 | dtls1_fix_message_header(s, frag_off, |
329 | len - DTLS1_HM_HEADER_LENGTH); | |
330 | ||
4e321ffa | 331 | dtls1_write_message_header(s, (unsigned char *)&s->init_buf->data[s->init_off]); |
36d16f8e BL |
332 | |
333 | OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH); | |
334 | } | |
335 | ||
336 | ret=dtls1_write_bytes(s,type,&s->init_buf->data[s->init_off], | |
337 | len); | |
338 | if (ret < 0) | |
339 | { | |
340 | /* might need to update MTU here, but we don't know | |
341 | * which previous packet caused the failure -- so can't | |
342 | * really retransmit anything. continue as if everything | |
343 | * is fine and wait for an alert to handle the | |
344 | * retransmit | |
345 | */ | |
346 | if ( BIO_ctrl(SSL_get_wbio(s), | |
29c2fd46 | 347 | BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0 ) |
36d16f8e BL |
348 | s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), |
349 | BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); | |
350 | else | |
351 | return(-1); | |
352 | } | |
353 | else | |
354 | { | |
54ef01b5 | 355 | |
36d16f8e BL |
356 | /* bad if this assert fails, only part of the handshake |
357 | * message got sent. but why would this happen? */ | |
90acf770 | 358 | OPENSSL_assert(len == (unsigned int)ret); |
54ef01b5 | 359 | |
36d16f8e | 360 | if (type == SSL3_RT_HANDSHAKE && ! s->d1->retransmitting) |
90acf770 | 361 | { |
36d16f8e BL |
362 | /* should not be done for 'Hello Request's, but in that case |
363 | * we'll ignore the result anyway */ | |
e979c039 | 364 | unsigned char *p = (unsigned char *)&s->init_buf->data[s->init_off]; |
90acf770 | 365 | const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; |
e979c039 | 366 | int xlen; |
90acf770 | 367 | |
b452f433 | 368 | if (frag_off == 0 && s->version != DTLS1_BAD_VER) |
90acf770 AP |
369 | { |
370 | /* reconstruct message header is if it | |
371 | * is being sent in single fragment */ | |
372 | *p++ = msg_hdr->type; | |
373 | l2n3(msg_hdr->msg_len,p); | |
374 | s2n (msg_hdr->seq,p); | |
375 | l2n3(0,p); | |
376 | l2n3(msg_hdr->msg_len,p); | |
377 | p -= DTLS1_HM_HEADER_LENGTH; | |
e979c039 | 378 | xlen = ret; |
90acf770 AP |
379 | } |
380 | else | |
381 | { | |
382 | p += DTLS1_HM_HEADER_LENGTH; | |
e979c039 | 383 | xlen = ret - DTLS1_HM_HEADER_LENGTH; |
90acf770 AP |
384 | } |
385 | ||
e979c039 | 386 | ssl3_finish_mac(s, p, xlen); |
90acf770 AP |
387 | } |
388 | ||
36d16f8e BL |
389 | if (ret == s->init_num) |
390 | { | |
391 | if (s->msg_callback) | |
392 | s->msg_callback(1, s->version, type, s->init_buf->data, | |
393 | (size_t)(s->init_off + s->init_num), s, | |
394 | s->msg_callback_arg); | |
395 | ||
396 | s->init_off = 0; /* done writing this message */ | |
397 | s->init_num = 0; | |
90acf770 | 398 | |
36d16f8e BL |
399 | return(1); |
400 | } | |
401 | s->init_off+=ret; | |
402 | s->init_num-=ret; | |
403 | frag_off += (ret -= DTLS1_HM_HEADER_LENGTH); | |
404 | } | |
405 | } | |
406 | return(0); | |
407 | } | |
408 | ||
409 | ||
410 | /* Obtain handshake message of message type 'mt' (any if mt == -1), | |
411 | * maximum acceptable body length 'max'. | |
412 | * Read an entire handshake message. Handshake messages arrive in | |
413 | * fragments. | |
414 | */ | |
beb056b3 | 415 | long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok) |
36d16f8e BL |
416 | { |
417 | int i, al; | |
90acf770 | 418 | struct hm_header_st *msg_hdr; |
1507f3ab DSH |
419 | unsigned char *p; |
420 | unsigned long msg_len; | |
36d16f8e BL |
421 | |
422 | /* s3->tmp is used to store messages that are unexpected, caused | |
423 | * by the absence of an optional handshake message */ | |
424 | if (s->s3->tmp.reuse_message) | |
425 | { | |
426 | s->s3->tmp.reuse_message=0; | |
427 | if ((mt >= 0) && (s->s3->tmp.message_type != mt)) | |
428 | { | |
429 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
beb056b3 | 430 | SSLerr(SSL_F_DTLS1_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE); |
36d16f8e BL |
431 | goto f_err; |
432 | } | |
433 | *ok=1; | |
434 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
435 | s->init_num = (int)s->s3->tmp.message_size; | |
436 | return s->init_num; | |
437 | } | |
54ef01b5 | 438 | |
90acf770 | 439 | msg_hdr = &s->d1->r_msg_hdr; |
1507f3ab DSH |
440 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); |
441 | ||
442 | again: | |
443 | i = dtls1_get_message_fragment(s, st1, stn, max, ok); | |
444 | if ( i == DTLS1_HM_BAD_FRAGMENT || | |
445 | i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */ | |
446 | goto again; | |
447 | else if ( i <= 0 && !*ok) | |
448 | return i; | |
36d16f8e | 449 | |
1507f3ab DSH |
450 | p = (unsigned char *)s->init_buf->data; |
451 | msg_len = msg_hdr->msg_len; | |
452 | ||
453 | /* reconstruct message header */ | |
454 | *(p++) = msg_hdr->type; | |
455 | l2n3(msg_len,p); | |
456 | s2n (msg_hdr->seq,p); | |
457 | l2n3(0,p); | |
458 | l2n3(msg_len,p); | |
459 | if (s->version != DTLS1_BAD_VER) { | |
460 | p -= DTLS1_HM_HEADER_LENGTH; | |
461 | msg_len += DTLS1_HM_HEADER_LENGTH; | |
462 | } | |
36d16f8e | 463 | |
1507f3ab DSH |
464 | ssl3_finish_mac(s, p, msg_len); |
465 | if (s->msg_callback) | |
466 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
467 | p, msg_len, | |
468 | s, s->msg_callback_arg); | |
469 | ||
470 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
471 | ||
fbbf28e7 DSH |
472 | /* Don't change sequence numbers while listening */ |
473 | if (!s->d1->listen) | |
474 | s->d1->handshake_read_seq++; | |
475 | ||
1507f3ab DSH |
476 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; |
477 | return s->init_num; | |
36d16f8e BL |
478 | |
479 | f_err: | |
480 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
481 | *ok = 0; | |
482 | return -1; | |
483 | } | |
484 | ||
485 | ||
90acf770 AP |
486 | static int dtls1_preprocess_fragment(SSL *s,struct hm_header_st *msg_hdr,int max) |
487 | { | |
488 | size_t frag_off,frag_len,msg_len; | |
489 | ||
490 | msg_len = msg_hdr->msg_len; | |
491 | frag_off = msg_hdr->frag_off; | |
492 | frag_len = msg_hdr->frag_len; | |
493 | ||
494 | /* sanity checking */ | |
495 | if ( (frag_off+frag_len) > msg_len) | |
496 | { | |
497 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
498 | return SSL_AD_ILLEGAL_PARAMETER; | |
499 | } | |
500 | ||
501 | if ( (frag_off+frag_len) > (unsigned long)max) | |
502 | { | |
503 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
504 | return SSL_AD_ILLEGAL_PARAMETER; | |
505 | } | |
506 | ||
507 | if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */ | |
508 | { | |
509 | /* msg_len is limited to 2^24, but is effectively checked | |
510 | * against max above */ | |
511 | if (!BUF_MEM_grow_clean(s->init_buf,msg_len+DTLS1_HM_HEADER_LENGTH)) | |
512 | { | |
513 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,ERR_R_BUF_LIB); | |
514 | return SSL_AD_INTERNAL_ERROR; | |
515 | } | |
516 | ||
517 | s->s3->tmp.message_size = msg_len; | |
518 | s->d1->r_msg_hdr.msg_len = msg_len; | |
519 | s->s3->tmp.message_type = msg_hdr->type; | |
520 | s->d1->r_msg_hdr.type = msg_hdr->type; | |
521 | s->d1->r_msg_hdr.seq = msg_hdr->seq; | |
522 | } | |
523 | else if (msg_len != s->d1->r_msg_hdr.msg_len) | |
524 | { | |
525 | /* They must be playing with us! BTW, failure to enforce | |
526 | * upper limit would open possibility for buffer overrun. */ | |
527 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
528 | return SSL_AD_ILLEGAL_PARAMETER; | |
529 | } | |
530 | ||
531 | return 0; /* no error */ | |
532 | } | |
533 | ||
534 | ||
36d16f8e | 535 | static int |
90acf770 | 536 | dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok) |
54ef01b5 AP |
537 | { |
538 | /* (0) check whether the desired fragment is available | |
539 | * if so: | |
540 | * (1) copy over the fragment to s->init_buf->data[] | |
541 | * (2) update s->init_num | |
542 | */ | |
543 | pitem *item; | |
544 | hm_fragment *frag; | |
90acf770 | 545 | int al; |
54ef01b5 | 546 | |
90acf770 | 547 | *ok = 0; |
54ef01b5 AP |
548 | item = pqueue_peek(s->d1->buffered_messages); |
549 | if ( item == NULL) | |
550 | return 0; | |
551 | ||
552 | frag = (hm_fragment *)item->data; | |
1507f3ab DSH |
553 | |
554 | /* Don't return if reassembly still in progress */ | |
555 | if (frag->reassembly != NULL) | |
556 | return 0; | |
54ef01b5 | 557 | |
90acf770 | 558 | if ( s->d1->handshake_read_seq == frag->msg_header.seq) |
54ef01b5 | 559 | { |
561cbe56 | 560 | unsigned long frag_len = frag->msg_header.frag_len; |
54ef01b5 | 561 | pqueue_pop(s->d1->buffered_messages); |
54ef01b5 | 562 | |
90acf770 AP |
563 | al=dtls1_preprocess_fragment(s,&frag->msg_header,max); |
564 | ||
565 | if (al==0) /* no alert */ | |
566 | { | |
e979c039 | 567 | unsigned char *p = (unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH; |
90acf770 AP |
568 | memcpy(&p[frag->msg_header.frag_off], |
569 | frag->fragment,frag->msg_header.frag_len); | |
570 | } | |
54ef01b5 | 571 | |
90acf770 | 572 | dtls1_hm_fragment_free(frag); |
54ef01b5 AP |
573 | pitem_free(item); |
574 | ||
90acf770 AP |
575 | if (al==0) |
576 | { | |
577 | *ok = 1; | |
561cbe56 | 578 | return frag_len; |
90acf770 AP |
579 | } |
580 | ||
581 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
582 | s->init_num = 0; | |
583 | *ok = 0; | |
584 | return -1; | |
54ef01b5 AP |
585 | } |
586 | else | |
587 | return 0; | |
588 | } | |
36d16f8e | 589 | |
934ca071 MC |
590 | /* dtls1_max_handshake_message_len returns the maximum number of bytes |
591 | * permitted in a DTLS handshake message for |s|. The minimum is 16KB, but may | |
592 | * be greater if the maximum certificate list size requires it. */ | |
593 | static unsigned long dtls1_max_handshake_message_len(const SSL *s) | |
594 | { | |
595 | unsigned long max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH; | |
596 | if (max_len < (unsigned long)s->max_cert_list) | |
597 | return s->max_cert_list; | |
598 | return max_len; | |
599 | } | |
36d16f8e | 600 | |
1507f3ab DSH |
601 | static int |
602 | dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok) | |
603 | { | |
604 | hm_fragment *frag = NULL; | |
605 | pitem *item = NULL; | |
606 | int i = -1, is_complete; | |
607 | unsigned char seq64be[8]; | |
934ca071 | 608 | unsigned long frag_len = msg_hdr->frag_len; |
1507f3ab | 609 | |
934ca071 MC |
610 | if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len || |
611 | msg_hdr->msg_len > dtls1_max_handshake_message_len(s)) | |
1507f3ab DSH |
612 | goto err; |
613 | ||
614 | /* Try to find item in queue */ | |
615 | memset(seq64be,0,sizeof(seq64be)); | |
616 | seq64be[6] = (unsigned char) (msg_hdr->seq>>8); | |
617 | seq64be[7] = (unsigned char) msg_hdr->seq; | |
618 | item = pqueue_find(s->d1->buffered_messages, seq64be); | |
619 | ||
620 | if (item == NULL) | |
621 | { | |
622 | frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1); | |
623 | if ( frag == NULL) | |
624 | goto err; | |
625 | memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); | |
626 | frag->msg_header.frag_len = frag->msg_header.msg_len; | |
627 | frag->msg_header.frag_off = 0; | |
628 | } | |
629 | else | |
f4e6ed09 | 630 | { |
1507f3ab | 631 | frag = (hm_fragment*) item->data; |
f4e6ed09 DSH |
632 | if (frag->msg_header.msg_len != msg_hdr->msg_len) |
633 | { | |
634 | item = NULL; | |
635 | frag = NULL; | |
636 | goto err; | |
637 | } | |
638 | } | |
639 | ||
1507f3ab DSH |
640 | |
641 | /* If message is already reassembled, this must be a | |
ad007e0a MC |
642 | * retransmit and can be dropped. In this case item != NULL and so frag |
643 | * does not need to be freed. | |
1507f3ab DSH |
644 | */ |
645 | if (frag->reassembly == NULL) | |
646 | { | |
647 | unsigned char devnull [256]; | |
648 | ||
649 | while (frag_len) | |
650 | { | |
651 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
652 | devnull, | |
653 | frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0); | |
654 | if (i<=0) goto err; | |
655 | frag_len -= i; | |
656 | } | |
657 | return DTLS1_HM_FRAGMENT_RETRY; | |
658 | } | |
659 | ||
660 | /* read the body of the fragment (header has already been read */ | |
661 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
662 | frag->fragment + msg_hdr->frag_off,frag_len,0); | |
663 | if (i<=0 || (unsigned long)i!=frag_len) | |
664 | goto err; | |
665 | ||
8c1e7de6 DSH |
666 | RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off, |
667 | (long)(msg_hdr->frag_off + frag_len)); | |
1507f3ab | 668 | |
8c1e7de6 DSH |
669 | RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len, |
670 | is_complete); | |
1507f3ab DSH |
671 | |
672 | if (is_complete) | |
673 | { | |
674 | OPENSSL_free(frag->reassembly); | |
675 | frag->reassembly = NULL; | |
676 | } | |
677 | ||
678 | if (item == NULL) | |
679 | { | |
680 | memset(seq64be,0,sizeof(seq64be)); | |
681 | seq64be[6] = (unsigned char)(msg_hdr->seq>>8); | |
682 | seq64be[7] = (unsigned char)(msg_hdr->seq); | |
683 | ||
684 | item = pitem_new(seq64be, frag); | |
685 | if (item == NULL) | |
686 | { | |
1507f3ab | 687 | i = -1; |
bffbaf92 | 688 | goto err; |
1507f3ab DSH |
689 | } |
690 | ||
691 | pqueue_insert(s->d1->buffered_messages, item); | |
692 | } | |
693 | ||
694 | return DTLS1_HM_FRAGMENT_RETRY; | |
695 | ||
696 | err: | |
84361b89 | 697 | if (frag != NULL && item == NULL) dtls1_hm_fragment_free(frag); |
1507f3ab DSH |
698 | *ok = 0; |
699 | return i; | |
700 | } | |
701 | ||
702 | ||
36d16f8e | 703 | static int |
90acf770 | 704 | dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok) |
36d16f8e | 705 | { |
90acf770 | 706 | int i=-1; |
54ef01b5 AP |
707 | hm_fragment *frag = NULL; |
708 | pitem *item = NULL; | |
709 | unsigned char seq64be[8]; | |
90acf770 | 710 | unsigned long frag_len = msg_hdr->frag_len; |
36d16f8e | 711 | |
90acf770 | 712 | if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len) |
54ef01b5 | 713 | goto err; |
36d16f8e | 714 | |
abda7c11 DSH |
715 | /* Try to find item in queue, to prevent duplicate entries */ |
716 | memset(seq64be,0,sizeof(seq64be)); | |
717 | seq64be[6] = (unsigned char) (msg_hdr->seq>>8); | |
718 | seq64be[7] = (unsigned char) msg_hdr->seq; | |
719 | item = pqueue_find(s->d1->buffered_messages, seq64be); | |
1507f3ab DSH |
720 | |
721 | /* If we already have an entry and this one is a fragment, | |
722 | * don't discard it and rather try to reassemble it. | |
723 | */ | |
724 | if (item != NULL && frag_len < msg_hdr->msg_len) | |
725 | item = NULL; | |
726 | ||
abda7c11 | 727 | /* Discard the message if sequence number was already there, is |
4e63da06 DSH |
728 | * too far in the future, already in the queue or if we received |
729 | * a FINISHED before the SERVER_HELLO, which then must be a stale | |
730 | * retransmit. | |
731 | */ | |
abda7c11 | 732 | if (msg_hdr->seq <= s->d1->handshake_read_seq || |
4e63da06 | 733 | msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL || |
7074f1df | 734 | (s->d1->handshake_read_seq == 0 && msg_hdr->type == SSL3_MT_FINISHED)) |
90acf770 AP |
735 | { |
736 | unsigned char devnull [256]; | |
737 | ||
738 | while (frag_len) | |
739 | { | |
740 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
741 | devnull, | |
742 | frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0); | |
743 | if (i<=0) goto err; | |
744 | frag_len -= i; | |
745 | } | |
746 | } | |
1507f3ab | 747 | else |
90acf770 | 748 | { |
1507f3ab DSH |
749 | if (frag_len && frag_len < msg_hdr->msg_len) |
750 | return dtls1_reassemble_fragment(s, msg_hdr, ok); | |
751 | ||
934ca071 MC |
752 | if (frag_len > dtls1_max_handshake_message_len(s)) |
753 | goto err; | |
754 | ||
1507f3ab | 755 | frag = dtls1_hm_fragment_new(frag_len, 0); |
017d2a88 DSH |
756 | if ( frag == NULL) |
757 | goto err; | |
758 | ||
759 | memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); | |
760 | ||
1507f3ab DSH |
761 | if (frag_len) |
762 | { | |
763 | /* read the body of the fragment (header has already been read */ | |
764 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
765 | frag->fragment,frag_len,0); | |
766 | if (i<=0 || (unsigned long)i!=frag_len) | |
767 | goto err; | |
768 | } | |
90acf770 | 769 | |
017d2a88 DSH |
770 | memset(seq64be,0,sizeof(seq64be)); |
771 | seq64be[6] = (unsigned char)(msg_hdr->seq>>8); | |
772 | seq64be[7] = (unsigned char)(msg_hdr->seq); | |
188b0579 | 773 | |
017d2a88 DSH |
774 | item = pitem_new(seq64be, frag); |
775 | if ( item == NULL) | |
776 | goto err; | |
777 | ||
778 | pqueue_insert(s->d1->buffered_messages, item); | |
779 | } | |
36d16f8e | 780 | |
90acf770 | 781 | return DTLS1_HM_FRAGMENT_RETRY; |
36d16f8e BL |
782 | |
783 | err: | |
84361b89 | 784 | if (frag != NULL && item == NULL) dtls1_hm_fragment_free(frag); |
54ef01b5 | 785 | *ok = 0; |
90acf770 | 786 | return i; |
54ef01b5 | 787 | } |
36d16f8e BL |
788 | |
789 | ||
beb056b3 | 790 | static long |
36d16f8e BL |
791 | dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok) |
792 | { | |
90acf770 | 793 | unsigned char wire[DTLS1_HM_HEADER_LENGTH]; |
1507f3ab | 794 | unsigned long len, frag_off, frag_len; |
36d16f8e BL |
795 | int i,al; |
796 | struct hm_header_st msg_hdr; | |
54ef01b5 | 797 | |
519c977c | 798 | redo: |
54ef01b5 | 799 | /* see if we have the required fragment already */ |
90acf770 AP |
800 | if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok) |
801 | { | |
1507f3ab | 802 | if (*ok) s->init_num = frag_len; |
90acf770 AP |
803 | return frag_len; |
804 | } | |
36d16f8e | 805 | |
54ef01b5 | 806 | /* read handshake message header */ |
90acf770 | 807 | i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,wire, |
36d16f8e BL |
808 | DTLS1_HM_HEADER_LENGTH, 0); |
809 | if (i <= 0) /* nbio, or an error */ | |
810 | { | |
811 | s->rwstate=SSL_READING; | |
812 | *ok = 0; | |
813 | return i; | |
814 | } | |
68b53300 DSH |
815 | /* Handshake fails if message header is incomplete */ |
816 | if (i != DTLS1_HM_HEADER_LENGTH) | |
817 | { | |
818 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
819 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE); | |
820 | goto f_err; | |
821 | } | |
36d16f8e | 822 | |
54ef01b5 | 823 | /* parse the message fragment header */ |
90acf770 | 824 | dtls1_get_message_header(wire, &msg_hdr); |
54ef01b5 AP |
825 | |
826 | /* | |
827 | * if this is a future (or stale) message it gets buffered | |
fbbf28e7 DSH |
828 | * (or dropped)--no further processing at this time |
829 | * While listening, we accept seq 1 (ClientHello with cookie) | |
830 | * although we're still expecting seq 0 (ClientHello) | |
54ef01b5 | 831 | */ |
fbbf28e7 | 832 | if (msg_hdr.seq != s->d1->handshake_read_seq && !(s->d1->listen && msg_hdr.seq == 1)) |
54ef01b5 AP |
833 | return dtls1_process_out_of_seq_message(s, &msg_hdr, ok); |
834 | ||
1507f3ab | 835 | len = msg_hdr.msg_len; |
54ef01b5 | 836 | frag_off = msg_hdr.frag_off; |
36d16f8e BL |
837 | frag_len = msg_hdr.frag_len; |
838 | ||
1507f3ab DSH |
839 | if (frag_len && frag_len < len) |
840 | return dtls1_reassemble_fragment(s, &msg_hdr, ok); | |
841 | ||
36d16f8e | 842 | if (!s->server && s->d1->r_msg_hdr.frag_off == 0 && |
90acf770 | 843 | wire[0] == SSL3_MT_HELLO_REQUEST) |
54ef01b5 AP |
844 | { |
845 | /* The server may always send 'Hello Request' messages -- | |
846 | * we are doing a handshake anyway now, so ignore them | |
847 | * if their format is correct. Does not count for | |
848 | * 'Finished' MAC. */ | |
90acf770 | 849 | if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) |
54ef01b5 AP |
850 | { |
851 | if (s->msg_callback) | |
852 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
90acf770 | 853 | wire, DTLS1_HM_HEADER_LENGTH, s, |
54ef01b5 AP |
854 | s->msg_callback_arg); |
855 | ||
856 | s->init_num = 0; | |
519c977c | 857 | goto redo; |
54ef01b5 AP |
858 | } |
859 | else /* Incorrectly formated Hello request */ | |
860 | { | |
861 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
862 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE); | |
863 | goto f_err; | |
864 | } | |
865 | } | |
866 | ||
90acf770 | 867 | if ((al=dtls1_preprocess_fragment(s,&msg_hdr,max))) |
54ef01b5 | 868 | goto f_err; |
36d16f8e BL |
869 | |
870 | /* XDTLS: ressurect this when restart is in place */ | |
871 | s->state=stn; | |
54ef01b5 | 872 | |
36d16f8e BL |
873 | if ( frag_len > 0) |
874 | { | |
e979c039 | 875 | unsigned char *p=(unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH; |
90acf770 | 876 | |
36d16f8e | 877 | i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, |
90acf770 | 878 | &p[frag_off],frag_len,0); |
54ef01b5 | 879 | /* XDTLS: fix this--message fragments cannot span multiple packets */ |
36d16f8e BL |
880 | if (i <= 0) |
881 | { | |
882 | s->rwstate=SSL_READING; | |
883 | *ok = 0; | |
884 | return i; | |
885 | } | |
886 | } | |
887 | else | |
888 | i = 0; | |
889 | ||
54ef01b5 AP |
890 | /* XDTLS: an incorrectly formatted fragment should cause the |
891 | * handshake to fail */ | |
68b53300 DSH |
892 | if (i != (int)frag_len) |
893 | { | |
894 | al=SSL3_AD_ILLEGAL_PARAMETER; | |
895 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL3_AD_ILLEGAL_PARAMETER); | |
896 | goto f_err; | |
897 | } | |
36d16f8e | 898 | |
90acf770 | 899 | *ok = 1; |
36d16f8e | 900 | |
90acf770 AP |
901 | /* Note that s->init_num is *not* used as current offset in |
902 | * s->init_buf->data, but as a counter summing up fragments' | |
903 | * lengths: as soon as they sum up to handshake packet | |
904 | * length, we assume we have got all the fragments. */ | |
1507f3ab | 905 | s->init_num = frag_len; |
90acf770 | 906 | return frag_len; |
36d16f8e BL |
907 | |
908 | f_err: | |
909 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
54ef01b5 | 910 | s->init_num = 0; |
90acf770 | 911 | |
36d16f8e BL |
912 | *ok=0; |
913 | return(-1); | |
914 | } | |
915 | ||
916 | int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen) | |
917 | { | |
918 | unsigned char *p,*d; | |
919 | int i; | |
920 | unsigned long l; | |
921 | ||
922 | if (s->state == a) | |
923 | { | |
924 | d=(unsigned char *)s->init_buf->data; | |
925 | p= &(d[DTLS1_HM_HEADER_LENGTH]); | |
926 | ||
927 | i=s->method->ssl3_enc->final_finish_mac(s, | |
36d16f8e BL |
928 | sender,slen,s->s3->tmp.finish_md); |
929 | s->s3->tmp.finish_md_len = i; | |
930 | memcpy(p, s->s3->tmp.finish_md, i); | |
931 | p+=i; | |
932 | l=i; | |
933 | ||
d5b8c464 DSH |
934 | /* Copy the finished so we can use it for |
935 | * renegotiation checks | |
936 | */ | |
937 | if(s->type == SSL_ST_CONNECT) | |
938 | { | |
939 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); | |
940 | memcpy(s->s3->previous_client_finished, | |
941 | s->s3->tmp.finish_md, i); | |
942 | s->s3->previous_client_finished_len=i; | |
943 | } | |
944 | else | |
945 | { | |
946 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); | |
947 | memcpy(s->s3->previous_server_finished, | |
948 | s->s3->tmp.finish_md, i); | |
949 | s->s3->previous_server_finished_len=i; | |
950 | } | |
951 | ||
36d16f8e BL |
952 | #ifdef OPENSSL_SYS_WIN16 |
953 | /* MSVC 1.5 does not clear the top bytes of the word unless | |
954 | * I do this. | |
955 | */ | |
956 | l&=0xffff; | |
957 | #endif | |
958 | ||
959 | d = dtls1_set_message_header(s, d, SSL3_MT_FINISHED, l, 0, l); | |
960 | s->init_num=(int)l+DTLS1_HM_HEADER_LENGTH; | |
961 | s->init_off=0; | |
962 | ||
963 | /* buffer the message to handle re-xmits */ | |
964 | dtls1_buffer_message(s, 0); | |
54ef01b5 | 965 | |
36d16f8e BL |
966 | s->state=b; |
967 | } | |
968 | ||
969 | /* SSL3_ST_SEND_xxxxxx_HELLO_B */ | |
970 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
971 | } | |
972 | ||
973 | /* for these 2 messages, we need to | |
974 | * ssl->enc_read_ctx re-init | |
975 | * ssl->s3->read_sequence zero | |
976 | * ssl->s3->read_mac_secret re-init | |
977 | * ssl->session->read_sym_enc assign | |
978 | * ssl->session->read_compression assign | |
979 | * ssl->session->read_hash assign | |
980 | */ | |
981 | int dtls1_send_change_cipher_spec(SSL *s, int a, int b) | |
982 | { | |
983 | unsigned char *p; | |
984 | ||
985 | if (s->state == a) | |
986 | { | |
987 | p=(unsigned char *)s->init_buf->data; | |
988 | *p++=SSL3_MT_CCS; | |
989 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
36d16f8e | 990 | s->init_num=DTLS1_CCS_HEADER_LENGTH; |
b452f433 DSH |
991 | |
992 | if (s->version == DTLS1_BAD_VER) { | |
993 | s->d1->next_handshake_write_seq++; | |
994 | s2n(s->d1->handshake_write_seq,p); | |
995 | s->init_num+=2; | |
996 | } | |
997 | ||
36d16f8e BL |
998 | s->init_off=0; |
999 | ||
1000 | dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, | |
1001 | s->d1->handshake_write_seq, 0, 0); | |
1002 | ||
1003 | /* buffer the message to handle re-xmits */ | |
1004 | dtls1_buffer_message(s, 1); | |
1005 | ||
1006 | s->state=b; | |
1007 | } | |
1008 | ||
1009 | /* SSL3_ST_CW_CHANGE_B */ | |
1010 | return(dtls1_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC)); | |
1011 | } | |
1012 | ||
dbb834ff DSH |
1013 | static int dtls1_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x) |
1014 | { | |
5135d6b9 DSH |
1015 | int n; |
1016 | unsigned char *p; | |
dbb834ff | 1017 | |
5135d6b9 DSH |
1018 | n=i2d_X509(x,NULL); |
1019 | if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3))) | |
1020 | { | |
1021 | SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF,ERR_R_BUF_LIB); | |
1022 | return 0; | |
1023 | } | |
1024 | p=(unsigned char *)&(buf->data[*l]); | |
1025 | l2n3(n,p); | |
1026 | i2d_X509(x,&p); | |
1027 | *l+=n+3; | |
dbb834ff | 1028 | |
5135d6b9 | 1029 | return 1; |
dbb834ff | 1030 | } |
36d16f8e BL |
1031 | unsigned long dtls1_output_cert_chain(SSL *s, X509 *x) |
1032 | { | |
1033 | unsigned char *p; | |
dbb834ff | 1034 | int i; |
36d16f8e BL |
1035 | unsigned long l= 3 + DTLS1_HM_HEADER_LENGTH; |
1036 | BUF_MEM *buf; | |
36d16f8e BL |
1037 | |
1038 | /* TLSv1 sends a chain with nothing in it, instead of an alert */ | |
1039 | buf=s->init_buf; | |
1040 | if (!BUF_MEM_grow_clean(buf,10)) | |
1041 | { | |
beb056b3 | 1042 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB); |
36d16f8e BL |
1043 | return(0); |
1044 | } | |
1045 | if (x != NULL) | |
1046 | { | |
dbb834ff DSH |
1047 | X509_STORE_CTX xs_ctx; |
1048 | ||
1049 | if (!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,x,NULL)) | |
1050 | { | |
1051 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB); | |
1052 | return(0); | |
1053 | } | |
1054 | ||
1055 | X509_verify_cert(&xs_ctx); | |
7b52778e DSH |
1056 | /* Don't leave errors in the queue */ |
1057 | ERR_clear_error(); | |
dbb834ff DSH |
1058 | for (i=0; i < sk_X509_num(xs_ctx.chain); i++) |
1059 | { | |
1060 | x = sk_X509_value(xs_ctx.chain, i); | |
1061 | ||
1062 | if (!dtls1_add_cert_to_buf(buf, &l, x)) | |
1063 | { | |
1064 | X509_STORE_CTX_cleanup(&xs_ctx); | |
1065 | return 0; | |
1066 | } | |
1067 | } | |
1068 | X509_STORE_CTX_cleanup(&xs_ctx); | |
1069 | } | |
1070 | /* Thawte special :-) */ | |
36d16f8e BL |
1071 | for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++) |
1072 | { | |
1073 | x=sk_X509_value(s->ctx->extra_certs,i); | |
dbb834ff DSH |
1074 | if (!dtls1_add_cert_to_buf(buf, &l, x)) |
1075 | return 0; | |
36d16f8e BL |
1076 | } |
1077 | ||
1078 | l-= (3 + DTLS1_HM_HEADER_LENGTH); | |
1079 | ||
1080 | p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); | |
1081 | l2n3(l,p); | |
1082 | l+=3; | |
1083 | p=(unsigned char *)&(buf->data[0]); | |
1084 | p = dtls1_set_message_header(s, p, SSL3_MT_CERTIFICATE, l, 0, l); | |
1085 | ||
1086 | l+=DTLS1_HM_HEADER_LENGTH; | |
1087 | return(l); | |
1088 | } | |
1089 | ||
1090 | int dtls1_read_failed(SSL *s, int code) | |
54ef01b5 | 1091 | { |
54ef01b5 AP |
1092 | if ( code > 0) |
1093 | { | |
1094 | fprintf( stderr, "invalid state reached %s:%d", __FILE__, __LINE__); | |
1095 | return 1; | |
1096 | } | |
1097 | ||
d6584eba | 1098 | if (!dtls1_is_timer_expired(s)) |
54ef01b5 AP |
1099 | { |
1100 | /* not a timeout, none of our business, | |
1101 | let higher layers handle this. in fact it's probably an error */ | |
1102 | return code; | |
1103 | } | |
1104 | ||
1105 | if ( ! SSL_in_init(s)) /* done, no need to send a retransmit */ | |
1106 | { | |
1107 | BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ); | |
1108 | return code; | |
1109 | } | |
1110 | ||
36d16f8e | 1111 | #if 0 /* for now, each alert contains only one record number */ |
54ef01b5 AP |
1112 | item = pqueue_peek(state->rcvd_records); |
1113 | if ( item ) | |
1114 | { | |
1115 | /* send an alert immediately for all the missing records */ | |
1116 | } | |
1117 | else | |
36d16f8e BL |
1118 | #endif |
1119 | ||
1120 | #if 0 /* no more alert sending, just retransmit the last set of messages */ | |
a4bade7a DSH |
1121 | if ( state->timeout.read_timeouts >= DTLS1_TMO_READ_COUNT) |
1122 | ssl3_send_alert(s,SSL3_AL_WARNING, | |
1123 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); | |
36d16f8e BL |
1124 | #endif |
1125 | ||
a4bade7a | 1126 | return dtls1_handle_timeout(s); |
54ef01b5 | 1127 | } |
36d16f8e | 1128 | |
c900a78c DSH |
1129 | int |
1130 | dtls1_get_queue_priority(unsigned short seq, int is_ccs) | |
1131 | { | |
1132 | /* The index of the retransmission queue actually is the message sequence number, | |
1133 | * since the queue only contains messages of a single handshake. However, the | |
1134 | * ChangeCipherSpec has no message sequence number and so using only the sequence | |
1135 | * will result in the CCS and Finished having the same index. To prevent this, | |
1136 | * the sequence number is multiplied by 2. In case of a CCS 1 is subtracted. | |
1137 | * This does not only differ CSS and Finished, it also maintains the order of the | |
1138 | * index (important for priority queues) and fits in the unsigned short variable. | |
1139 | */ | |
1140 | return seq * 2 - is_ccs; | |
1141 | } | |
36d16f8e | 1142 | |
c900a78c | 1143 | int |
36d16f8e | 1144 | dtls1_retransmit_buffered_messages(SSL *s) |
54ef01b5 AP |
1145 | { |
1146 | pqueue sent = s->d1->sent_messages; | |
1147 | piterator iter; | |
1148 | pitem *item; | |
1149 | hm_fragment *frag; | |
1150 | int found = 0; | |
1151 | ||
1152 | iter = pqueue_iterator(sent); | |
1153 | ||
1154 | for ( item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter)) | |
1155 | { | |
1156 | frag = (hm_fragment *)item->data; | |
c900a78c | 1157 | if ( dtls1_retransmit_message(s, |
a543ea44 | 1158 | (unsigned short)dtls1_get_queue_priority(frag->msg_header.seq, frag->msg_header.is_ccs), |
c900a78c | 1159 | 0, &found) <= 0 && found) |
54ef01b5 AP |
1160 | { |
1161 | fprintf(stderr, "dtls1_retransmit_message() failed\n"); | |
1162 | return -1; | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | return 1; | |
1167 | } | |
36d16f8e | 1168 | |
36d16f8e BL |
1169 | int |
1170 | dtls1_buffer_message(SSL *s, int is_ccs) | |
54ef01b5 AP |
1171 | { |
1172 | pitem *item; | |
1173 | hm_fragment *frag; | |
1174 | unsigned char seq64be[8]; | |
1175 | ||
1176 | /* this function is called immediately after a message has | |
1177 | * been serialized */ | |
1178 | OPENSSL_assert(s->init_off == 0); | |
1179 | ||
1507f3ab | 1180 | frag = dtls1_hm_fragment_new(s->init_num, 0); |
34b087c9 DSH |
1181 | if (!frag) |
1182 | return 0; | |
54ef01b5 AP |
1183 | |
1184 | memcpy(frag->fragment, s->init_buf->data, s->init_num); | |
1185 | ||
1186 | if ( is_ccs) | |
1187 | { | |
1188 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + | |
b452f433 | 1189 | ((s->version==DTLS1_VERSION)?DTLS1_CCS_HEADER_LENGTH:3) == (unsigned int)s->init_num); |
54ef01b5 AP |
1190 | } |
1191 | else | |
1192 | { | |
1193 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + | |
1194 | DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num); | |
1195 | } | |
1196 | ||
1197 | frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len; | |
1198 | frag->msg_header.seq = s->d1->w_msg_hdr.seq; | |
1199 | frag->msg_header.type = s->d1->w_msg_hdr.type; | |
1200 | frag->msg_header.frag_off = 0; | |
1201 | frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len; | |
1202 | frag->msg_header.is_ccs = is_ccs; | |
1203 | ||
c900a78c DSH |
1204 | /* save current state*/ |
1205 | frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx; | |
1206 | frag->msg_header.saved_retransmit_state.write_hash = s->write_hash; | |
1207 | frag->msg_header.saved_retransmit_state.compress = s->compress; | |
1208 | frag->msg_header.saved_retransmit_state.session = s->session; | |
1209 | frag->msg_header.saved_retransmit_state.epoch = s->d1->w_epoch; | |
1210 | ||
54ef01b5 | 1211 | memset(seq64be,0,sizeof(seq64be)); |
c900a78c DSH |
1212 | seq64be[6] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq, |
1213 | frag->msg_header.is_ccs)>>8); | |
1214 | seq64be[7] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq, | |
1215 | frag->msg_header.is_ccs)); | |
54ef01b5 AP |
1216 | |
1217 | item = pitem_new(seq64be, frag); | |
1218 | if ( item == NULL) | |
1219 | { | |
1220 | dtls1_hm_fragment_free(frag); | |
1221 | return 0; | |
1222 | } | |
36d16f8e BL |
1223 | |
1224 | #if 0 | |
54ef01b5 AP |
1225 | fprintf( stderr, "buffered messge: \ttype = %xx\n", msg_buf->type); |
1226 | fprintf( stderr, "\t\t\t\t\tlen = %d\n", msg_buf->len); | |
1227 | fprintf( stderr, "\t\t\t\t\tseq_num = %d\n", msg_buf->seq_num); | |
36d16f8e BL |
1228 | #endif |
1229 | ||
54ef01b5 AP |
1230 | pqueue_insert(s->d1->sent_messages, item); |
1231 | return 1; | |
1232 | } | |
36d16f8e BL |
1233 | |
1234 | int | |
1235 | dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off, | |
54ef01b5 AP |
1236 | int *found) |
1237 | { | |
1238 | int ret; | |
1239 | /* XDTLS: for now assuming that read/writes are blocking */ | |
1240 | pitem *item; | |
1241 | hm_fragment *frag ; | |
1242 | unsigned long header_length; | |
1243 | unsigned char seq64be[8]; | |
c900a78c DSH |
1244 | struct dtls1_retransmit_state saved_state; |
1245 | unsigned char save_write_sequence[8]; | |
54ef01b5 AP |
1246 | |
1247 | /* | |
1248 | OPENSSL_assert(s->init_num == 0); | |
1249 | OPENSSL_assert(s->init_off == 0); | |
1250 | */ | |
1251 | ||
1252 | /* XDTLS: the requested message ought to be found, otherwise error */ | |
1253 | memset(seq64be,0,sizeof(seq64be)); | |
1254 | seq64be[6] = (unsigned char)(seq>>8); | |
1255 | seq64be[7] = (unsigned char)seq; | |
1256 | ||
1257 | item = pqueue_find(s->d1->sent_messages, seq64be); | |
1258 | if ( item == NULL) | |
1259 | { | |
1260 | fprintf(stderr, "retransmit: message %d non-existant\n", seq); | |
1261 | *found = 0; | |
1262 | return 0; | |
1263 | } | |
1264 | ||
1265 | *found = 1; | |
1266 | frag = (hm_fragment *)item->data; | |
1267 | ||
1268 | if ( frag->msg_header.is_ccs) | |
1269 | header_length = DTLS1_CCS_HEADER_LENGTH; | |
1270 | else | |
1271 | header_length = DTLS1_HM_HEADER_LENGTH; | |
1272 | ||
1273 | memcpy(s->init_buf->data, frag->fragment, | |
1274 | frag->msg_header.msg_len + header_length); | |
1275 | s->init_num = frag->msg_header.msg_len + header_length; | |
1276 | ||
1277 | dtls1_set_message_header_int(s, frag->msg_header.type, | |
1278 | frag->msg_header.msg_len, frag->msg_header.seq, 0, | |
1279 | frag->msg_header.frag_len); | |
1280 | ||
c900a78c DSH |
1281 | /* save current state */ |
1282 | saved_state.enc_write_ctx = s->enc_write_ctx; | |
1283 | saved_state.write_hash = s->write_hash; | |
1284 | saved_state.compress = s->compress; | |
1285 | saved_state.session = s->session; | |
1286 | saved_state.epoch = s->d1->w_epoch; | |
1287 | saved_state.epoch = s->d1->w_epoch; | |
1288 | ||
54ef01b5 | 1289 | s->d1->retransmitting = 1; |
c900a78c DSH |
1290 | |
1291 | /* restore state in which the message was originally sent */ | |
1292 | s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx; | |
1293 | s->write_hash = frag->msg_header.saved_retransmit_state.write_hash; | |
1294 | s->compress = frag->msg_header.saved_retransmit_state.compress; | |
1295 | s->session = frag->msg_header.saved_retransmit_state.session; | |
1296 | s->d1->w_epoch = frag->msg_header.saved_retransmit_state.epoch; | |
1297 | ||
1298 | if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1) | |
1299 | { | |
1300 | memcpy(save_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence)); | |
1301 | memcpy(s->s3->write_sequence, s->d1->last_write_sequence, sizeof(s->s3->write_sequence)); | |
1302 | } | |
1303 | ||
54ef01b5 | 1304 | ret = dtls1_do_write(s, frag->msg_header.is_ccs ? |
c900a78c DSH |
1305 | SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE); |
1306 | ||
1307 | /* restore current state */ | |
1308 | s->enc_write_ctx = saved_state.enc_write_ctx; | |
1309 | s->write_hash = saved_state.write_hash; | |
1310 | s->compress = saved_state.compress; | |
1311 | s->session = saved_state.session; | |
1312 | s->d1->w_epoch = saved_state.epoch; | |
1313 | ||
1314 | if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1) | |
1315 | { | |
1316 | memcpy(s->d1->last_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence)); | |
1317 | memcpy(s->s3->write_sequence, save_write_sequence, sizeof(s->s3->write_sequence)); | |
1318 | } | |
1319 | ||
54ef01b5 AP |
1320 | s->d1->retransmitting = 0; |
1321 | ||
1322 | (void)BIO_flush(SSL_get_wbio(s)); | |
1323 | return ret; | |
1324 | } | |
36d16f8e BL |
1325 | |
1326 | /* call this function when the buffered messages are no longer needed */ | |
1327 | void | |
1328 | dtls1_clear_record_buffer(SSL *s) | |
54ef01b5 AP |
1329 | { |
1330 | pitem *item; | |
1331 | ||
1332 | for(item = pqueue_pop(s->d1->sent_messages); | |
1333 | item != NULL; item = pqueue_pop(s->d1->sent_messages)) | |
1334 | { | |
1335 | dtls1_hm_fragment_free((hm_fragment *)item->data); | |
1336 | pitem_free(item); | |
1337 | } | |
1338 | } | |
36d16f8e BL |
1339 | |
1340 | ||
1341 | unsigned char * | |
1342 | dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt, | |
54ef01b5 AP |
1343 | unsigned long len, unsigned long frag_off, unsigned long frag_len) |
1344 | { | |
fbbf28e7 DSH |
1345 | /* Don't change sequence numbers while listening */ |
1346 | if (frag_off == 0 && !s->d1->listen) | |
54ef01b5 AP |
1347 | { |
1348 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
1349 | s->d1->next_handshake_write_seq++; | |
1350 | } | |
1351 | ||
1352 | dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq, | |
1353 | frag_off, frag_len); | |
1354 | ||
1355 | return p += DTLS1_HM_HEADER_LENGTH; | |
1356 | } | |
36d16f8e BL |
1357 | |
1358 | ||
1359 | /* don't actually do the writing, wait till the MTU has been retrieved */ | |
1360 | static void | |
1361 | dtls1_set_message_header_int(SSL *s, unsigned char mt, | |
54ef01b5 AP |
1362 | unsigned long len, unsigned short seq_num, unsigned long frag_off, |
1363 | unsigned long frag_len) | |
1364 | { | |
1365 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1366 | ||
1367 | msg_hdr->type = mt; | |
1368 | msg_hdr->msg_len = len; | |
1369 | msg_hdr->seq = seq_num; | |
1370 | msg_hdr->frag_off = frag_off; | |
1371 | msg_hdr->frag_len = frag_len; | |
1372 | } | |
36d16f8e BL |
1373 | |
1374 | static void | |
1375 | dtls1_fix_message_header(SSL *s, unsigned long frag_off, | |
54ef01b5 AP |
1376 | unsigned long frag_len) |
1377 | { | |
1378 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1379 | ||
1380 | msg_hdr->frag_off = frag_off; | |
1381 | msg_hdr->frag_len = frag_len; | |
1382 | } | |
36d16f8e BL |
1383 | |
1384 | static unsigned char * | |
1385 | dtls1_write_message_header(SSL *s, unsigned char *p) | |
54ef01b5 AP |
1386 | { |
1387 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1388 | ||
1389 | *p++ = msg_hdr->type; | |
1390 | l2n3(msg_hdr->msg_len, p); | |
1391 | ||
1392 | s2n(msg_hdr->seq, p); | |
1393 | l2n3(msg_hdr->frag_off, p); | |
1394 | l2n3(msg_hdr->frag_len, p); | |
1395 | ||
1396 | return p; | |
1397 | } | |
36d16f8e | 1398 | |
8f096885 | 1399 | unsigned int |
36d16f8e | 1400 | dtls1_min_mtu(void) |
54ef01b5 AP |
1401 | { |
1402 | return (g_probable_mtu[(sizeof(g_probable_mtu) / | |
1403 | sizeof(g_probable_mtu[0])) - 1]); | |
1404 | } | |
36d16f8e BL |
1405 | |
1406 | static unsigned int | |
1407 | dtls1_guess_mtu(unsigned int curr_mtu) | |
1408 | { | |
f920c5b5 | 1409 | unsigned int i; |
36d16f8e BL |
1410 | |
1411 | if ( curr_mtu == 0 ) | |
1412 | return g_probable_mtu[0] ; | |
1413 | ||
1414 | for ( i = 0; i < sizeof(g_probable_mtu)/sizeof(g_probable_mtu[0]); i++) | |
1415 | if ( curr_mtu > g_probable_mtu[i]) | |
1416 | return g_probable_mtu[i]; | |
54ef01b5 | 1417 | |
36d16f8e BL |
1418 | return curr_mtu; |
1419 | } | |
1420 | ||
1421 | void | |
1422 | dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr) | |
54ef01b5 AP |
1423 | { |
1424 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
1425 | msg_hdr->type = *(data++); | |
1426 | n2l3(data, msg_hdr->msg_len); | |
1427 | ||
1428 | n2s(data, msg_hdr->seq); | |
1429 | n2l3(data, msg_hdr->frag_off); | |
1430 | n2l3(data, msg_hdr->frag_len); | |
1431 | } | |
36d16f8e BL |
1432 | |
1433 | void | |
1434 | dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr) | |
54ef01b5 AP |
1435 | { |
1436 | memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st)); | |
1437 | ||
1438 | ccs_hdr->type = *(data++); | |
54ef01b5 | 1439 | } |