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1 | /* ssl/d1_both.c */ |
2 | /* | |
3 | * DTLS implementation written by Nagendra Modadugu | |
4 | * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. | |
5 | */ | |
6 | /* ==================================================================== | |
7 | * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * | |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
17 | * notice, this list of conditions and the following disclaimer in | |
18 | * the documentation and/or other materials provided with the | |
19 | * distribution. | |
20 | * | |
21 | * 3. All advertising materials mentioning features or use of this | |
22 | * software must display the following acknowledgment: | |
23 | * "This product includes software developed by the OpenSSL Project | |
24 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
25 | * | |
26 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
27 | * endorse or promote products derived from this software without | |
28 | * prior written permission. For written permission, please contact | |
29 | * openssl-core@openssl.org. | |
30 | * | |
31 | * 5. Products derived from this software may not be called "OpenSSL" | |
32 | * nor may "OpenSSL" appear in their names without prior written | |
33 | * permission of the OpenSSL Project. | |
34 | * | |
35 | * 6. Redistributions of any form whatsoever must retain the following | |
36 | * acknowledgment: | |
37 | * "This product includes software developed by the OpenSSL Project | |
38 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
41 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
43 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
44 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
45 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
47 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
49 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
50 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
51 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
52 | * ==================================================================== | |
53 | * | |
54 | * This product includes cryptographic software written by Eric Young | |
55 | * (eay@cryptsoft.com). This product includes software written by Tim | |
56 | * Hudson (tjh@cryptsoft.com). | |
57 | * | |
58 | */ | |
59 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
60 | * All rights reserved. | |
61 | * | |
62 | * This package is an SSL implementation written | |
63 | * by Eric Young (eay@cryptsoft.com). | |
64 | * The implementation was written so as to conform with Netscapes SSL. | |
65 | * | |
66 | * This library is free for commercial and non-commercial use as long as | |
67 | * the following conditions are aheared to. The following conditions | |
68 | * apply to all code found in this distribution, be it the RC4, RSA, | |
69 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
70 | * included with this distribution is covered by the same copyright terms | |
71 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
72 | * | |
73 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
74 | * the code are not to be removed. | |
75 | * If this package is used in a product, Eric Young should be given attribution | |
76 | * as the author of the parts of the library used. | |
77 | * This can be in the form of a textual message at program startup or | |
78 | * in documentation (online or textual) provided with the package. | |
79 | * | |
80 | * Redistribution and use in source and binary forms, with or without | |
81 | * modification, are permitted provided that the following conditions | |
82 | * are met: | |
83 | * 1. Redistributions of source code must retain the copyright | |
84 | * notice, this list of conditions and the following disclaimer. | |
85 | * 2. Redistributions in binary form must reproduce the above copyright | |
86 | * notice, this list of conditions and the following disclaimer in the | |
87 | * documentation and/or other materials provided with the distribution. | |
88 | * 3. All advertising materials mentioning features or use of this software | |
89 | * must display the following acknowledgement: | |
90 | * "This product includes cryptographic software written by | |
91 | * Eric Young (eay@cryptsoft.com)" | |
92 | * The word 'cryptographic' can be left out if the rouines from the library | |
93 | * being used are not cryptographic related :-). | |
94 | * 4. If you include any Windows specific code (or a derivative thereof) from | |
95 | * the apps directory (application code) you must include an acknowledgement: | |
96 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
97 | * | |
98 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
99 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
100 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
101 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
102 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
103 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
104 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
105 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
106 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
107 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
108 | * SUCH DAMAGE. | |
109 | * | |
110 | * The licence and distribution terms for any publically available version or | |
111 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
112 | * copied and put under another distribution licence | |
113 | * [including the GNU Public Licence.] | |
114 | */ | |
115 | ||
116 | #include <limits.h> | |
117 | #include <string.h> | |
118 | #include <stdio.h> | |
119 | #include "ssl_locl.h" | |
120 | #include <openssl/buffer.h> | |
121 | #include <openssl/rand.h> | |
122 | #include <openssl/objects.h> | |
123 | #include <openssl/evp.h> | |
124 | #include <openssl/x509.h> | |
125 | ||
126 | ||
127 | /* XDTLS: figure out the right values */ | |
128 | static unsigned int g_probable_mtu[] = {1500 - 28, 512 - 28, 256 - 28}; | |
129 | ||
130 | static unsigned int dtls1_min_mtu(void); | |
131 | static unsigned int dtls1_guess_mtu(unsigned int curr_mtu); | |
132 | static void dtls1_fix_message_header(SSL *s, unsigned long frag_off, | |
133 | unsigned long frag_len); | |
134 | static unsigned char *dtls1_write_message_header(SSL *s, | |
135 | unsigned char *p); | |
136 | static void dtls1_set_message_header_int(SSL *s, unsigned char mt, | |
137 | unsigned long len, unsigned short seq_num, unsigned long frag_off, | |
138 | unsigned long frag_len); | |
139 | static int dtls1_retransmit_buffered_messages(SSL *s); | |
140 | static long dtls1_get_message_fragment(SSL *s, int st1, int stn, | |
141 | long max, int *ok); | |
142 | static void dtls1_process_handshake_fragment(SSL *s, int frag_len); | |
143 | ||
144 | static hm_fragment * | |
145 | dtls1_hm_fragment_new(unsigned long frag_len) | |
146 | { | |
147 | hm_fragment *frag = NULL; | |
148 | unsigned char *buf = NULL; | |
149 | ||
150 | frag = (hm_fragment *)OPENSSL_malloc(sizeof(hm_fragment)); | |
151 | if ( frag == NULL) | |
152 | return NULL; | |
153 | ||
154 | buf = (unsigned char *)OPENSSL_malloc(frag_len | |
155 | + DTLS1_HM_HEADER_LENGTH); | |
156 | if ( buf == NULL) | |
157 | { | |
158 | OPENSSL_free(frag); | |
159 | return NULL; | |
160 | } | |
161 | ||
162 | frag->fragment = buf; | |
163 | ||
164 | return frag; | |
165 | } | |
166 | ||
167 | static void | |
168 | dtls1_hm_fragment_free(hm_fragment *frag) | |
169 | { | |
170 | OPENSSL_free(frag->fragment); | |
171 | OPENSSL_free(frag); | |
172 | } | |
173 | ||
174 | /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */ | |
175 | int dtls1_do_write(SSL *s, int type) | |
176 | { | |
177 | int ret; | |
178 | int curr_mtu; | |
179 | unsigned int len, frag_off; | |
180 | ||
181 | /* AHA! Figure out the MTU, and stick to the right size */ | |
182 | if ( ! (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) | |
183 | { | |
184 | s->d1->mtu = | |
185 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); | |
186 | ||
187 | /* I've seen the kernel return bogus numbers when it doesn't know | |
188 | * (initial write), so just make sure we have a reasonable number */ | |
189 | if ( s->d1->mtu < dtls1_min_mtu()) | |
190 | { | |
191 | s->d1->mtu = 0; | |
192 | s->d1->mtu = dtls1_guess_mtu(s->d1->mtu); | |
193 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU, | |
194 | s->d1->mtu, NULL); | |
195 | } | |
196 | } | |
197 | #if 0 | |
198 | mtu = s->d1->mtu; | |
199 | ||
200 | fprintf(stderr, "using MTU = %d\n", mtu); | |
201 | ||
202 | mtu -= (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH); | |
203 | ||
204 | curr_mtu = mtu - BIO_wpending(SSL_get_wbio(s)); | |
205 | ||
206 | if ( curr_mtu > 0) | |
207 | mtu = curr_mtu; | |
208 | else if ( ( ret = BIO_flush(SSL_get_wbio(s))) <= 0) | |
209 | return ret; | |
210 | ||
211 | if ( BIO_wpending(SSL_get_wbio(s)) + s->init_num >= mtu) | |
212 | { | |
213 | ret = BIO_flush(SSL_get_wbio(s)); | |
214 | if ( ret <= 0) | |
215 | return ret; | |
216 | mtu = s->d1->mtu - (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH); | |
217 | } | |
218 | ||
219 | OPENSSL_assert(mtu > 0); /* should have something reasonable now */ | |
220 | ||
221 | #endif | |
222 | ||
223 | if ( s->init_off == 0 && type == SSL3_RT_HANDSHAKE) | |
224 | OPENSSL_assert(s->init_num == | |
6c61726b | 225 | (int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH); |
36d16f8e BL |
226 | |
227 | frag_off = 0; | |
228 | while( s->init_num) | |
229 | { | |
230 | curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) - | |
231 | DTLS1_RT_HEADER_LENGTH; | |
232 | ||
233 | if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH) | |
234 | { | |
235 | /* grr.. we could get an error if MTU picked was wrong */ | |
236 | ret = BIO_flush(SSL_get_wbio(s)); | |
237 | if ( ret <= 0) | |
238 | return ret; | |
239 | curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH; | |
240 | } | |
241 | ||
242 | if ( s->init_num > curr_mtu) | |
243 | len = curr_mtu; | |
244 | else | |
245 | len = s->init_num; | |
246 | ||
247 | ||
248 | /* XDTLS: this function is too long. split out the CCS part */ | |
249 | if ( type == SSL3_RT_HANDSHAKE) | |
250 | { | |
251 | if ( s->init_off != 0) | |
252 | { | |
253 | OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH); | |
254 | s->init_off -= DTLS1_HM_HEADER_LENGTH; | |
255 | s->init_num += DTLS1_HM_HEADER_LENGTH; | |
256 | ||
257 | /* write atleast DTLS1_HM_HEADER_LENGTH bytes */ | |
258 | if ( len <= DTLS1_HM_HEADER_LENGTH) | |
259 | len += DTLS1_HM_HEADER_LENGTH; | |
260 | } | |
261 | ||
262 | dtls1_fix_message_header(s, frag_off, | |
263 | len - DTLS1_HM_HEADER_LENGTH); | |
264 | ||
4e321ffa | 265 | dtls1_write_message_header(s, (unsigned char *)&s->init_buf->data[s->init_off]); |
36d16f8e BL |
266 | |
267 | OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH); | |
268 | } | |
269 | ||
270 | ret=dtls1_write_bytes(s,type,&s->init_buf->data[s->init_off], | |
271 | len); | |
272 | if (ret < 0) | |
273 | { | |
274 | /* might need to update MTU here, but we don't know | |
275 | * which previous packet caused the failure -- so can't | |
276 | * really retransmit anything. continue as if everything | |
277 | * is fine and wait for an alert to handle the | |
278 | * retransmit | |
279 | */ | |
280 | if ( BIO_ctrl(SSL_get_wbio(s), | |
281 | BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL)) | |
282 | s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), | |
283 | BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); | |
284 | else | |
285 | return(-1); | |
286 | } | |
287 | else | |
288 | { | |
289 | ||
290 | /* bad if this assert fails, only part of the handshake | |
291 | * message got sent. but why would this happen? */ | |
6c61726b | 292 | OPENSSL_assert(len == (unsigned int)ret); |
36d16f8e BL |
293 | |
294 | if (type == SSL3_RT_HANDSHAKE && ! s->d1->retransmitting) | |
295 | /* should not be done for 'Hello Request's, but in that case | |
296 | * we'll ignore the result anyway */ | |
297 | ssl3_finish_mac(s, | |
298 | (unsigned char *)&s->init_buf->data[s->init_off + | |
299 | DTLS1_HM_HEADER_LENGTH], ret - DTLS1_HM_HEADER_LENGTH); | |
300 | ||
301 | if (ret == s->init_num) | |
302 | { | |
303 | if (s->msg_callback) | |
304 | s->msg_callback(1, s->version, type, s->init_buf->data, | |
305 | (size_t)(s->init_off + s->init_num), s, | |
306 | s->msg_callback_arg); | |
307 | ||
308 | s->init_off = 0; /* done writing this message */ | |
309 | s->init_num = 0; | |
310 | ||
311 | return(1); | |
312 | } | |
313 | s->init_off+=ret; | |
314 | s->init_num-=ret; | |
315 | frag_off += (ret -= DTLS1_HM_HEADER_LENGTH); | |
316 | } | |
317 | } | |
318 | return(0); | |
319 | } | |
320 | ||
321 | ||
322 | /* Obtain handshake message of message type 'mt' (any if mt == -1), | |
323 | * maximum acceptable body length 'max'. | |
324 | * Read an entire handshake message. Handshake messages arrive in | |
325 | * fragments. | |
326 | */ | |
beb056b3 | 327 | long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok) |
36d16f8e BL |
328 | { |
329 | int i, al; | |
330 | ||
331 | /* s3->tmp is used to store messages that are unexpected, caused | |
332 | * by the absence of an optional handshake message */ | |
333 | if (s->s3->tmp.reuse_message) | |
334 | { | |
335 | s->s3->tmp.reuse_message=0; | |
336 | if ((mt >= 0) && (s->s3->tmp.message_type != mt)) | |
337 | { | |
338 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
beb056b3 | 339 | SSLerr(SSL_F_DTLS1_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE); |
36d16f8e BL |
340 | goto f_err; |
341 | } | |
342 | *ok=1; | |
343 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
344 | s->init_num = (int)s->s3->tmp.message_size; | |
345 | return s->init_num; | |
346 | } | |
347 | ||
348 | do | |
349 | { | |
350 | if ( s->d1->r_msg_hdr.frag_off == 0) | |
351 | { | |
352 | /* s->d1->r_message_header.msg_len = 0; */ | |
353 | memset(&(s->d1->r_msg_hdr), 0x00, sizeof(struct hm_header_st)); | |
354 | } | |
355 | ||
356 | i = dtls1_get_message_fragment(s, st1, stn, max, ok); | |
357 | if ( i == DTLS1_HM_BAD_FRAGMENT || | |
358 | i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */ | |
359 | continue; | |
360 | else if ( i <= 0 && !*ok) | |
361 | return i; | |
362 | ||
6c61726b | 363 | if (s->d1->r_msg_hdr.msg_len == (unsigned int)s->init_num - DTLS1_HM_HEADER_LENGTH) |
36d16f8e BL |
364 | { |
365 | memset(&(s->d1->r_msg_hdr), 0x00, sizeof(struct hm_header_st)); | |
366 | ||
367 | s->d1->handshake_read_seq++; | |
368 | /* we just read a handshake message from the other side: | |
369 | * this means that we don't need to retransmit of the | |
370 | * buffered messages. | |
371 | * XDTLS: may be able clear out this | |
372 | * buffer a little sooner (i.e if an out-of-order | |
373 | * handshake message/record is received at the record | |
374 | * layer. | |
375 | * XDTLS: exception is that the server needs to | |
376 | * know that change cipher spec and finished messages | |
377 | * have been received by the client before clearing this | |
378 | * buffer. this can simply be done by waiting for the | |
379 | * first data segment, but is there a better way? */ | |
380 | dtls1_clear_record_buffer(s); | |
381 | ||
382 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
383 | return s->init_num - DTLS1_HM_HEADER_LENGTH; | |
384 | } | |
385 | else | |
386 | s->d1->r_msg_hdr.frag_off = i; | |
387 | } while(1) ; | |
388 | ||
389 | f_err: | |
390 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
391 | *ok = 0; | |
392 | return -1; | |
393 | } | |
394 | ||
395 | ||
396 | static int | |
397 | dtls1_retrieve_buffered_fragment(SSL *s, unsigned long *copied) | |
398 | { | |
399 | /* (0) check whether the desired fragment is available | |
400 | * if so: | |
401 | * (1) copy over the fragment to s->init_buf->data[] | |
402 | * (2) update s->init_num | |
403 | */ | |
404 | pitem *item; | |
405 | hm_fragment *frag; | |
406 | unsigned long overlap; | |
407 | unsigned char *p; | |
408 | ||
409 | item = pqueue_peek(s->d1->buffered_messages); | |
410 | if ( item == NULL) | |
411 | return 0; | |
412 | ||
413 | frag = (hm_fragment *)item->data; | |
414 | ||
415 | if ( s->d1->handshake_read_seq == frag->msg_header.seq && | |
6c61726b | 416 | frag->msg_header.frag_off <= (unsigned int)s->init_num - DTLS1_HM_HEADER_LENGTH) |
36d16f8e BL |
417 | { |
418 | pqueue_pop(s->d1->buffered_messages); | |
419 | overlap = s->init_num - DTLS1_HM_HEADER_LENGTH | |
420 | - frag->msg_header.frag_off; | |
421 | ||
422 | p = frag->fragment; | |
423 | ||
424 | memcpy(&s->init_buf->data[s->init_num], | |
425 | p + DTLS1_HM_HEADER_LENGTH + overlap, | |
426 | frag->msg_header.frag_len - overlap); | |
427 | ||
428 | OPENSSL_free(frag->fragment); | |
429 | OPENSSL_free(frag); | |
430 | pitem_free(item); | |
431 | ||
432 | *copied = frag->msg_header.frag_len - overlap; | |
433 | return *copied; | |
434 | } | |
435 | else | |
436 | return 0; | |
437 | } | |
438 | ||
439 | ||
440 | static int | |
441 | dtls1_buffer_handshake_fragment(SSL *s, struct hm_header_st* msg_hdr) | |
442 | { | |
443 | hm_fragment *frag = NULL; | |
444 | pitem *item = NULL; | |
e2ac4732 | 445 | PQ_64BIT seq64; |
36d16f8e BL |
446 | |
447 | frag = dtls1_hm_fragment_new(msg_hdr->frag_len); | |
448 | if ( frag == NULL) | |
449 | goto err; | |
450 | ||
451 | memcpy(frag->fragment, &(s->init_buf->data[s->init_num]), | |
452 | msg_hdr->frag_len + DTLS1_HM_HEADER_LENGTH); | |
453 | ||
454 | memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); | |
455 | ||
e2ac4732 RL |
456 | pq_64bit_init(&seq64); |
457 | pq_64bit_assign_word(&seq64, msg_hdr->seq); | |
458 | ||
459 | item = pitem_new(seq64, frag); | |
36d16f8e BL |
460 | if ( item == NULL) |
461 | goto err; | |
462 | ||
e2ac4732 RL |
463 | pq_64bit_free(&seq64); |
464 | ||
36d16f8e BL |
465 | pqueue_insert(s->d1->buffered_messages, item); |
466 | return 1; | |
467 | ||
468 | err: | |
469 | if ( frag != NULL) dtls1_hm_fragment_free(frag); | |
470 | if ( item != NULL) OPENSSL_free(item); | |
471 | return 0; | |
472 | } | |
473 | ||
474 | ||
475 | static void | |
476 | dtls1_process_handshake_fragment(SSL *s, int frag_len) | |
477 | { | |
478 | unsigned char *p; | |
479 | ||
4e321ffa | 480 | p = (unsigned char *)s->init_buf->data; |
36d16f8e BL |
481 | |
482 | ssl3_finish_mac(s, &p[s->init_num - frag_len], frag_len); | |
483 | } | |
484 | ||
485 | ||
486 | static int | |
487 | dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st *msg_hdr, int *ok) | |
488 | { | |
489 | int i; | |
490 | unsigned char *p; | |
491 | ||
492 | /* make sure there's enough room to read this fragment */ | |
493 | if ( (int)msg_hdr->frag_len && !BUF_MEM_grow_clean(s->init_buf, | |
494 | (int)msg_hdr->frag_len + DTLS1_HM_HEADER_LENGTH + s->init_num)) | |
495 | { | |
beb056b3 | 496 | SSLerr(SSL_F_DTLS1_PROCESS_OUT_OF_SEQ_MESSAGE,ERR_R_BUF_LIB); |
36d16f8e BL |
497 | goto err; |
498 | } | |
499 | ||
4e321ffa | 500 | p = (unsigned char *)s->init_buf->data; |
36d16f8e BL |
501 | |
502 | /* read the body of the fragment (header has already been read */ | |
503 | if ( msg_hdr->frag_len > 0) | |
504 | { | |
505 | i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
506 | &p[s->init_num], | |
507 | msg_hdr->frag_len,0); | |
508 | if (i <= 0) | |
509 | { | |
510 | *ok = 0; | |
511 | return i; | |
512 | } | |
513 | } | |
514 | ||
515 | if ( msg_hdr->seq > s->d1->handshake_read_seq) | |
516 | dtls1_buffer_handshake_fragment(s, msg_hdr); | |
517 | else | |
518 | OPENSSL_assert(msg_hdr->seq < s->d1->handshake_read_seq); | |
519 | ||
520 | return DTLS1_HM_FRAGMENT_RETRY; | |
521 | err: | |
522 | *ok = 0; | |
523 | return -1; | |
524 | } | |
525 | ||
526 | ||
beb056b3 | 527 | static long |
36d16f8e BL |
528 | dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok) |
529 | { | |
530 | unsigned char *p; | |
531 | unsigned long l, frag_off, frag_len; | |
532 | int i,al; | |
533 | struct hm_header_st msg_hdr; | |
534 | unsigned long overlap; | |
535 | ||
536 | /* see if we have the required fragment already */ | |
537 | if (dtls1_retrieve_buffered_fragment(s, &l)) | |
538 | { | |
539 | /* compute MAC, remove fragment headers */ | |
540 | dtls1_process_handshake_fragment(s, l); | |
541 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
542 | s->state = stn; | |
543 | return 1; | |
544 | } | |
545 | ||
546 | /* get a handshake fragment from the record layer */ | |
547 | p = (unsigned char *)s->init_buf->data; | |
548 | ||
549 | /* read handshake message header */ | |
550 | i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num], | |
551 | DTLS1_HM_HEADER_LENGTH, 0); | |
552 | if (i <= 0) /* nbio, or an error */ | |
553 | { | |
554 | s->rwstate=SSL_READING; | |
555 | *ok = 0; | |
556 | return i; | |
557 | } | |
558 | ||
559 | OPENSSL_assert(i == DTLS1_HM_HEADER_LENGTH); | |
560 | ||
561 | p += s->init_num; | |
562 | /* parse the message fragment header */ | |
563 | ||
564 | dtls1_get_message_header(p, &msg_hdr); | |
565 | ||
566 | /* | |
567 | * if this is a future (or stale) message it gets buffered | |
568 | * (or dropped)--no further processing at this time | |
569 | */ | |
570 | if ( msg_hdr.seq != s->d1->handshake_read_seq) | |
571 | return dtls1_process_out_of_seq_message(s, &msg_hdr, ok); | |
572 | ||
573 | l = msg_hdr.msg_len; | |
574 | frag_off = msg_hdr.frag_off; | |
575 | frag_len = msg_hdr.frag_len; | |
576 | ||
577 | /* sanity checking */ | |
578 | if ( frag_off + frag_len > l) | |
579 | { | |
580 | al=SSL_AD_ILLEGAL_PARAMETER; | |
beb056b3 | 581 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); |
36d16f8e BL |
582 | goto f_err; |
583 | } | |
584 | ||
585 | if (!s->server && s->d1->r_msg_hdr.frag_off == 0 && | |
586 | p[0] == SSL3_MT_HELLO_REQUEST) | |
587 | { | |
588 | /* The server may always send 'Hello Request' messages -- | |
589 | * we are doing a handshake anyway now, so ignore them | |
590 | * if their format is correct. Does not count for | |
591 | * 'Finished' MAC. */ | |
592 | if (p[1] == 0 && p[2] == 0 &&p[3] == 0) | |
593 | { | |
594 | if (s->msg_callback) | |
595 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
596 | p, DTLS1_HM_HEADER_LENGTH, s, | |
597 | s->msg_callback_arg); | |
598 | ||
599 | s->init_num = 0; | |
600 | return dtls1_get_message_fragment(s, st1, stn, | |
601 | max, ok); | |
602 | } | |
603 | else /* Incorrectly formated Hello request */ | |
604 | { | |
605 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
beb056b3 | 606 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE); |
36d16f8e BL |
607 | goto f_err; |
608 | } | |
609 | } | |
610 | ||
611 | /* XDTLS: do a sanity check on the fragment */ | |
612 | ||
613 | s->init_num += i; | |
614 | ||
615 | if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */ | |
616 | { | |
617 | /* BUF_MEM_grow takes an 'int' parameter */ | |
618 | if (l > (INT_MAX-DTLS1_HM_HEADER_LENGTH)) | |
619 | { | |
620 | al=SSL_AD_ILLEGAL_PARAMETER; | |
beb056b3 | 621 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); |
36d16f8e BL |
622 | goto f_err; |
623 | } | |
624 | if (l && !BUF_MEM_grow_clean(s->init_buf,(int)l | |
625 | + DTLS1_HM_HEADER_LENGTH)) | |
626 | { | |
beb056b3 | 627 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,ERR_R_BUF_LIB); |
36d16f8e BL |
628 | goto err; |
629 | } | |
630 | /* Only do this test when we're reading the expected message. | |
631 | * Stale messages will be dropped and future messages will be buffered */ | |
632 | if ( l > (unsigned long)max) | |
633 | { | |
634 | al=SSL_AD_ILLEGAL_PARAMETER; | |
beb056b3 | 635 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); |
36d16f8e BL |
636 | goto f_err; |
637 | } | |
638 | ||
639 | s->s3->tmp.message_size=l; | |
640 | } | |
641 | ||
642 | if ( frag_len > (unsigned long)max) | |
643 | { | |
644 | al=SSL_AD_ILLEGAL_PARAMETER; | |
beb056b3 | 645 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); |
36d16f8e BL |
646 | goto f_err; |
647 | } | |
648 | if ( frag_len + s->init_num > (INT_MAX - DTLS1_HM_HEADER_LENGTH)) | |
649 | { | |
650 | al=SSL_AD_ILLEGAL_PARAMETER; | |
beb056b3 | 651 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); |
36d16f8e BL |
652 | goto f_err; |
653 | } | |
654 | ||
655 | if ( frag_len & !BUF_MEM_grow_clean(s->init_buf, (int)frag_len | |
656 | + DTLS1_HM_HEADER_LENGTH + s->init_num)) | |
657 | { | |
beb056b3 | 658 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,ERR_R_BUF_LIB); |
36d16f8e BL |
659 | goto err; |
660 | } | |
661 | ||
662 | if ( s->d1->r_msg_hdr.frag_off == 0) | |
663 | { | |
664 | s->s3->tmp.message_type = msg_hdr.type; | |
665 | s->d1->r_msg_hdr.type = msg_hdr.type; | |
666 | s->d1->r_msg_hdr.msg_len = l; | |
667 | /* s->d1->r_msg_hdr.seq = seq_num; */ | |
668 | } | |
669 | ||
670 | /* XDTLS: ressurect this when restart is in place */ | |
671 | s->state=stn; | |
672 | ||
673 | /* next state (stn) */ | |
4e321ffa | 674 | p = (unsigned char *)s->init_buf->data; |
36d16f8e BL |
675 | |
676 | if ( frag_len > 0) | |
677 | { | |
678 | i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
679 | &p[s->init_num], | |
680 | frag_len,0); | |
681 | /* XDTLS: fix this--message fragments cannot span multiple packets */ | |
682 | if (i <= 0) | |
683 | { | |
684 | s->rwstate=SSL_READING; | |
685 | *ok = 0; | |
686 | return i; | |
687 | } | |
688 | } | |
689 | else | |
690 | i = 0; | |
691 | ||
692 | /* XDTLS: an incorrectly formatted fragment should cause the | |
693 | * handshake to fail */ | |
6c61726b | 694 | OPENSSL_assert(i == (int)frag_len); |
36d16f8e BL |
695 | |
696 | #if 0 | |
697 | /* Successfully read a fragment. | |
698 | * It may be (1) out of order, or | |
699 | * (2) it's a repeat, in which case we dump it | |
700 | * (3) the one we are expecting next (maybe with overlap) | |
701 | * If it is next one, it may overlap with previously read bytes | |
702 | */ | |
703 | ||
704 | /* case (1): buffer the future fragment | |
705 | * (we can treat fragments from a future message the same | |
706 | * as future fragments from the message being currently read, since | |
707 | * they are sematically simply out of order. | |
708 | */ | |
709 | if ( msg_hdr.seq > s->d1->handshake_read_seq || | |
710 | frag_off > s->init_num - DTLS1_HM_HEADER_LENGTH) | |
711 | { | |
712 | dtls1_buffer_handshake_fragment(s, &msg_hdr); | |
713 | return DTLS1_HM_FRAGMENT_RETRY; | |
714 | } | |
715 | ||
716 | /* case (2): drop the entire fragment, and try again */ | |
717 | if ( msg_hdr.seq < s->d1->handshake_read_seq || | |
718 | frag_off + frag_len < s->init_num - DTLS1_HM_HEADER_LENGTH) | |
719 | { | |
720 | s->init_num -= DTLS1_HM_HEADER_LENGTH; | |
721 | return DTLS1_HM_FRAGMENT_RETRY; | |
722 | } | |
723 | #endif | |
724 | ||
725 | /* case (3): received a immediately useful fragment. Determine the | |
726 | * possible overlap and copy the fragment. | |
727 | */ | |
728 | overlap = (s->init_num - DTLS1_HM_HEADER_LENGTH) - frag_off; | |
729 | ||
730 | /* retain the header for the first fragment */ | |
731 | if ( s->init_num > DTLS1_HM_HEADER_LENGTH) | |
732 | { | |
733 | memmove(&(s->init_buf->data[s->init_num]), | |
734 | &(s->init_buf->data[s->init_num + DTLS1_HM_HEADER_LENGTH + overlap]), | |
735 | frag_len - overlap); | |
736 | ||
737 | s->init_num += frag_len - overlap; | |
738 | } | |
739 | else | |
740 | s->init_num += frag_len; | |
741 | ||
742 | dtls1_process_handshake_fragment(s, frag_len - overlap); | |
743 | ||
744 | if (s->msg_callback) | |
745 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, | |
746 | (size_t)s->init_num, s, | |
747 | s->msg_callback_arg); | |
748 | *ok=1; | |
749 | ||
750 | return s->init_num; | |
751 | ||
752 | f_err: | |
753 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
754 | s->init_num = 0; | |
755 | err: | |
756 | *ok=0; | |
757 | return(-1); | |
758 | } | |
759 | ||
760 | int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen) | |
761 | { | |
762 | unsigned char *p,*d; | |
763 | int i; | |
764 | unsigned long l; | |
765 | ||
766 | if (s->state == a) | |
767 | { | |
768 | d=(unsigned char *)s->init_buf->data; | |
769 | p= &(d[DTLS1_HM_HEADER_LENGTH]); | |
770 | ||
771 | i=s->method->ssl3_enc->final_finish_mac(s, | |
772 | &(s->s3->finish_dgst1), | |
773 | &(s->s3->finish_dgst2), | |
774 | sender,slen,s->s3->tmp.finish_md); | |
775 | s->s3->tmp.finish_md_len = i; | |
776 | memcpy(p, s->s3->tmp.finish_md, i); | |
777 | p+=i; | |
778 | l=i; | |
779 | ||
780 | #ifdef OPENSSL_SYS_WIN16 | |
781 | /* MSVC 1.5 does not clear the top bytes of the word unless | |
782 | * I do this. | |
783 | */ | |
784 | l&=0xffff; | |
785 | #endif | |
786 | ||
787 | d = dtls1_set_message_header(s, d, SSL3_MT_FINISHED, l, 0, l); | |
788 | s->init_num=(int)l+DTLS1_HM_HEADER_LENGTH; | |
789 | s->init_off=0; | |
790 | ||
791 | /* buffer the message to handle re-xmits */ | |
792 | dtls1_buffer_message(s, 0); | |
793 | ||
794 | s->state=b; | |
795 | } | |
796 | ||
797 | /* SSL3_ST_SEND_xxxxxx_HELLO_B */ | |
798 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
799 | } | |
800 | ||
801 | /* for these 2 messages, we need to | |
802 | * ssl->enc_read_ctx re-init | |
803 | * ssl->s3->read_sequence zero | |
804 | * ssl->s3->read_mac_secret re-init | |
805 | * ssl->session->read_sym_enc assign | |
806 | * ssl->session->read_compression assign | |
807 | * ssl->session->read_hash assign | |
808 | */ | |
809 | int dtls1_send_change_cipher_spec(SSL *s, int a, int b) | |
810 | { | |
811 | unsigned char *p; | |
812 | ||
813 | if (s->state == a) | |
814 | { | |
815 | p=(unsigned char *)s->init_buf->data; | |
816 | *p++=SSL3_MT_CCS; | |
817 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
818 | s->d1->next_handshake_write_seq++; | |
819 | s2n(s->d1->handshake_write_seq,p); | |
820 | ||
821 | s->init_num=DTLS1_CCS_HEADER_LENGTH; | |
822 | s->init_off=0; | |
823 | ||
824 | dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, | |
825 | s->d1->handshake_write_seq, 0, 0); | |
826 | ||
827 | /* buffer the message to handle re-xmits */ | |
828 | dtls1_buffer_message(s, 1); | |
829 | ||
830 | s->state=b; | |
831 | } | |
832 | ||
833 | /* SSL3_ST_CW_CHANGE_B */ | |
834 | return(dtls1_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC)); | |
835 | } | |
836 | ||
837 | unsigned long dtls1_output_cert_chain(SSL *s, X509 *x) | |
838 | { | |
839 | unsigned char *p; | |
840 | int n,i; | |
841 | unsigned long l= 3 + DTLS1_HM_HEADER_LENGTH; | |
842 | BUF_MEM *buf; | |
843 | X509_STORE_CTX xs_ctx; | |
844 | X509_OBJECT obj; | |
845 | ||
846 | /* TLSv1 sends a chain with nothing in it, instead of an alert */ | |
847 | buf=s->init_buf; | |
848 | if (!BUF_MEM_grow_clean(buf,10)) | |
849 | { | |
beb056b3 | 850 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB); |
36d16f8e BL |
851 | return(0); |
852 | } | |
853 | if (x != NULL) | |
854 | { | |
855 | if(!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL)) | |
856 | { | |
beb056b3 | 857 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB); |
36d16f8e BL |
858 | return(0); |
859 | } | |
860 | ||
861 | for (;;) | |
862 | { | |
863 | n=i2d_X509(x,NULL); | |
864 | if (!BUF_MEM_grow_clean(buf,(int)(n+l+3))) | |
865 | { | |
beb056b3 | 866 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB); |
36d16f8e BL |
867 | return(0); |
868 | } | |
869 | p=(unsigned char *)&(buf->data[l]); | |
870 | l2n3(n,p); | |
871 | i2d_X509(x,&p); | |
872 | l+=n+3; | |
873 | if (X509_NAME_cmp(X509_get_subject_name(x), | |
874 | X509_get_issuer_name(x)) == 0) break; | |
875 | ||
876 | i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509, | |
877 | X509_get_issuer_name(x),&obj); | |
878 | if (i <= 0) break; | |
879 | x=obj.data.x509; | |
880 | /* Count is one too high since the X509_STORE_get uped the | |
881 | * ref count */ | |
882 | X509_free(x); | |
883 | } | |
884 | ||
885 | X509_STORE_CTX_cleanup(&xs_ctx); | |
886 | } | |
887 | ||
888 | /* Thawte special :-) */ | |
889 | if (s->ctx->extra_certs != NULL) | |
890 | for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++) | |
891 | { | |
892 | x=sk_X509_value(s->ctx->extra_certs,i); | |
893 | n=i2d_X509(x,NULL); | |
894 | if (!BUF_MEM_grow_clean(buf,(int)(n+l+3))) | |
895 | { | |
beb056b3 | 896 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB); |
36d16f8e BL |
897 | return(0); |
898 | } | |
899 | p=(unsigned char *)&(buf->data[l]); | |
900 | l2n3(n,p); | |
901 | i2d_X509(x,&p); | |
902 | l+=n+3; | |
903 | } | |
904 | ||
905 | l-= (3 + DTLS1_HM_HEADER_LENGTH); | |
906 | ||
907 | p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); | |
908 | l2n3(l,p); | |
909 | l+=3; | |
910 | p=(unsigned char *)&(buf->data[0]); | |
911 | p = dtls1_set_message_header(s, p, SSL3_MT_CERTIFICATE, l, 0, l); | |
912 | ||
913 | l+=DTLS1_HM_HEADER_LENGTH; | |
914 | return(l); | |
915 | } | |
916 | ||
917 | int dtls1_read_failed(SSL *s, int code) | |
918 | { | |
919 | DTLS1_STATE *state; | |
920 | BIO *bio; | |
921 | int send_alert = 0; | |
922 | ||
923 | if ( code > 0) | |
924 | { | |
925 | fprintf( stderr, "invalid state reached %s:%d", __FILE__, __LINE__); | |
926 | return 1; | |
927 | } | |
928 | ||
929 | bio = SSL_get_rbio(s); | |
930 | if ( ! BIO_dgram_recv_timedout(bio)) | |
931 | { | |
932 | /* not a timeout, none of our business, | |
933 | let higher layers handle this. in fact it's probably an error */ | |
934 | return code; | |
935 | } | |
936 | ||
937 | if ( ! SSL_in_init(s)) /* done, no need to send a retransmit */ | |
938 | { | |
939 | BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ); | |
940 | return code; | |
941 | } | |
942 | ||
943 | state = s->d1; | |
944 | state->timeout.num_alerts++; | |
945 | if ( state->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) | |
946 | { | |
947 | /* fail the connection, enough alerts have been sent */ | |
948 | SSLerr(SSL_F_DTLS1_READ_FAILED,SSL_R_READ_TIMEOUT_EXPIRED); | |
949 | return 0; | |
950 | } | |
951 | ||
952 | state->timeout.read_timeouts++; | |
953 | if ( state->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) | |
954 | { | |
955 | send_alert = 1; | |
956 | state->timeout.read_timeouts = 1; | |
957 | } | |
958 | ||
959 | ||
960 | #if 0 /* for now, each alert contains only one record number */ | |
961 | item = pqueue_peek(state->rcvd_records); | |
962 | if ( item ) | |
963 | { | |
964 | /* send an alert immediately for all the missing records */ | |
965 | } | |
966 | else | |
967 | #endif | |
968 | ||
969 | #if 0 /* no more alert sending, just retransmit the last set of messages */ | |
970 | if ( send_alert) | |
971 | ssl3_send_alert(s,SSL3_AL_WARNING, | |
972 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); | |
973 | #endif | |
974 | ||
975 | return dtls1_retransmit_buffered_messages(s) ; | |
976 | } | |
977 | ||
978 | ||
979 | static int | |
980 | dtls1_retransmit_buffered_messages(SSL *s) | |
981 | { | |
982 | pqueue sent = s->d1->sent_messages; | |
983 | piterator iter; | |
984 | pitem *item; | |
985 | hm_fragment *frag; | |
986 | int found = 0; | |
987 | ||
988 | iter = pqueue_iterator(sent); | |
989 | ||
990 | for ( item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter)) | |
991 | { | |
992 | frag = (hm_fragment *)item->data; | |
993 | if ( dtls1_retransmit_message(s, frag->msg_header.seq, 0, &found) <= 0 && | |
994 | found) | |
995 | { | |
996 | fprintf(stderr, "dtls1_retransmit_message() failed\n"); | |
997 | return -1; | |
998 | } | |
999 | } | |
1000 | ||
1001 | return 1; | |
1002 | } | |
1003 | ||
1004 | #if 0 | |
1005 | static dtls1_message_buffer * | |
1006 | dtls1_message_buffer_new(unsigned int len) | |
1007 | { | |
1008 | dtls1_message_buffer *msg_buf; | |
1009 | ||
1010 | msg_buf = (dtls1_message_buffer *) | |
1011 | OPENSSL_malloc(sizeof(dtls1_message_buffer)); | |
1012 | if ( msg_buf == NULL) | |
1013 | return NULL; | |
1014 | ||
1015 | memset(msg_buf, 0x00, sizeof(dtls1_message_buffer)); | |
1016 | ||
1017 | msg_buf->data = (unsigned char *) OPENSSL_malloc(len); | |
1018 | if ( msg_buf->data == NULL) | |
1019 | { | |
1020 | OPENSSL_free(msg_buf); | |
1021 | return NULL; | |
1022 | } | |
1023 | ||
1024 | memset(msg_buf->data, 0x00, len); | |
1025 | return msg_buf; | |
1026 | } | |
1027 | #endif | |
1028 | ||
1029 | #if 0 | |
1030 | static void | |
1031 | dtls1_message_buffer_free(dtls1_message_buffer *msg_buf) | |
1032 | { | |
1033 | if (msg_buf != NULL) | |
1034 | { | |
1035 | OPENSSL_free(msg_buf->data); | |
1036 | OPENSSL_free(msg_buf); | |
1037 | } | |
1038 | } | |
1039 | #endif | |
1040 | ||
1041 | int | |
1042 | dtls1_buffer_message(SSL *s, int is_ccs) | |
1043 | { | |
1044 | pitem *item; | |
1045 | hm_fragment *frag; | |
e2ac4732 | 1046 | PQ_64BIT seq64; |
36d16f8e BL |
1047 | |
1048 | /* this function is called immediately after a message has | |
1049 | * been serialized */ | |
1050 | OPENSSL_assert(s->init_off == 0); | |
1051 | ||
1052 | frag = dtls1_hm_fragment_new(s->init_num); | |
1053 | ||
1054 | memcpy(frag->fragment, s->init_buf->data, s->init_num); | |
1055 | ||
1056 | if ( is_ccs) | |
1057 | { | |
1058 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + | |
6c61726b | 1059 | DTLS1_CCS_HEADER_LENGTH == (unsigned int)s->init_num); |
36d16f8e BL |
1060 | } |
1061 | else | |
1062 | { | |
1063 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + | |
6c61726b | 1064 | DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num); |
36d16f8e BL |
1065 | } |
1066 | ||
1067 | frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len; | |
1068 | frag->msg_header.seq = s->d1->w_msg_hdr.seq; | |
1069 | frag->msg_header.type = s->d1->w_msg_hdr.type; | |
1070 | frag->msg_header.frag_off = 0; | |
1071 | frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len; | |
1072 | frag->msg_header.is_ccs = is_ccs; | |
1073 | ||
e2ac4732 RL |
1074 | pq_64bit_init(&seq64); |
1075 | pq_64bit_assign_word(&seq64, frag->msg_header.seq); | |
1076 | ||
1077 | item = pitem_new(seq64, frag); | |
1078 | pq_64bit_free(&seq64); | |
36d16f8e BL |
1079 | if ( item == NULL) |
1080 | { | |
1081 | dtls1_hm_fragment_free(frag); | |
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | #if 0 | |
1086 | fprintf( stderr, "buffered messge: \ttype = %xx\n", msg_buf->type); | |
1087 | fprintf( stderr, "\t\t\t\t\tlen = %d\n", msg_buf->len); | |
1088 | fprintf( stderr, "\t\t\t\t\tseq_num = %d\n", msg_buf->seq_num); | |
1089 | #endif | |
1090 | ||
1091 | pqueue_insert(s->d1->sent_messages, item); | |
1092 | return 1; | |
1093 | } | |
1094 | ||
1095 | int | |
1096 | dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off, | |
1097 | int *found) | |
1098 | { | |
1099 | int ret; | |
1100 | /* XDTLS: for now assuming that read/writes are blocking */ | |
1101 | pitem *item; | |
1102 | hm_fragment *frag ; | |
1103 | unsigned long header_length; | |
e2ac4732 | 1104 | PQ_64BIT seq64; |
36d16f8e BL |
1105 | |
1106 | /* | |
1107 | OPENSSL_assert(s->init_num == 0); | |
1108 | OPENSSL_assert(s->init_off == 0); | |
1109 | */ | |
1110 | ||
1111 | /* XDTLS: the requested message ought to be found, otherwise error */ | |
e2ac4732 RL |
1112 | pq_64bit_init(&seq64); |
1113 | pq_64bit_assign_word(&seq64, seq); | |
1114 | ||
1115 | item = pqueue_find(s->d1->sent_messages, seq64); | |
1116 | pq_64bit_free(&seq64); | |
36d16f8e BL |
1117 | if ( item == NULL) |
1118 | { | |
1119 | fprintf(stderr, "retransmit: message %d non-existant\n", seq); | |
1120 | *found = 0; | |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | *found = 1; | |
1125 | frag = (hm_fragment *)item->data; | |
1126 | ||
1127 | if ( frag->msg_header.is_ccs) | |
1128 | header_length = DTLS1_CCS_HEADER_LENGTH; | |
1129 | else | |
1130 | header_length = DTLS1_HM_HEADER_LENGTH; | |
1131 | ||
1132 | memcpy(s->init_buf->data, frag->fragment, | |
1133 | frag->msg_header.msg_len + header_length); | |
1134 | s->init_num = frag->msg_header.msg_len + header_length; | |
1135 | ||
1136 | dtls1_set_message_header_int(s, frag->msg_header.type, | |
1137 | frag->msg_header.msg_len, frag->msg_header.seq, 0, | |
1138 | frag->msg_header.frag_len); | |
1139 | ||
1140 | s->d1->retransmitting = 1; | |
1141 | ret = dtls1_do_write(s, frag->msg_header.is_ccs ? | |
1142 | SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE); | |
1143 | s->d1->retransmitting = 0; | |
1144 | ||
ddb0cb5b | 1145 | (void)BIO_flush(SSL_get_wbio(s)); |
36d16f8e BL |
1146 | return ret; |
1147 | } | |
1148 | ||
1149 | /* call this function when the buffered messages are no longer needed */ | |
1150 | void | |
1151 | dtls1_clear_record_buffer(SSL *s) | |
1152 | { | |
1153 | pitem *item; | |
1154 | ||
1155 | for(item = pqueue_pop(s->d1->sent_messages); | |
1156 | item != NULL; item = pqueue_pop(s->d1->sent_messages)) | |
1157 | { | |
1158 | dtls1_hm_fragment_free((hm_fragment *)item->data); | |
1159 | pitem_free(item); | |
1160 | } | |
1161 | } | |
1162 | ||
1163 | ||
1164 | unsigned char * | |
1165 | dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt, | |
1166 | unsigned long len, unsigned long frag_off, unsigned long frag_len) | |
1167 | { | |
1168 | if ( frag_off == 0) | |
1169 | { | |
1170 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
1171 | s->d1->next_handshake_write_seq++; | |
1172 | } | |
1173 | ||
1174 | dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq, | |
1175 | frag_off, frag_len); | |
1176 | ||
1177 | return p += DTLS1_HM_HEADER_LENGTH; | |
1178 | } | |
1179 | ||
1180 | ||
1181 | /* don't actually do the writing, wait till the MTU has been retrieved */ | |
1182 | static void | |
1183 | dtls1_set_message_header_int(SSL *s, unsigned char mt, | |
1184 | unsigned long len, unsigned short seq_num, unsigned long frag_off, | |
1185 | unsigned long frag_len) | |
1186 | { | |
1187 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1188 | ||
1189 | msg_hdr->type = mt; | |
1190 | msg_hdr->msg_len = len; | |
1191 | msg_hdr->seq = seq_num; | |
1192 | msg_hdr->frag_off = frag_off; | |
1193 | msg_hdr->frag_len = frag_len; | |
1194 | } | |
1195 | ||
1196 | static void | |
1197 | dtls1_fix_message_header(SSL *s, unsigned long frag_off, | |
1198 | unsigned long frag_len) | |
1199 | { | |
1200 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1201 | ||
1202 | msg_hdr->frag_off = frag_off; | |
1203 | msg_hdr->frag_len = frag_len; | |
1204 | } | |
1205 | ||
1206 | static unsigned char * | |
1207 | dtls1_write_message_header(SSL *s, unsigned char *p) | |
1208 | { | |
1209 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1210 | ||
1211 | *p++ = msg_hdr->type; | |
1212 | l2n3(msg_hdr->msg_len, p); | |
1213 | ||
1214 | s2n(msg_hdr->seq, p); | |
1215 | l2n3(msg_hdr->frag_off, p); | |
1216 | l2n3(msg_hdr->frag_len, p); | |
1217 | ||
1218 | return p; | |
1219 | } | |
1220 | ||
1221 | static unsigned int | |
1222 | dtls1_min_mtu(void) | |
1223 | { | |
1224 | return | |
1225 | g_probable_mtu[(sizeof(g_probable_mtu) / | |
1226 | sizeof(g_probable_mtu[0])) - 1]; | |
1227 | } | |
1228 | ||
1229 | static unsigned int | |
1230 | dtls1_guess_mtu(unsigned int curr_mtu) | |
1231 | { | |
7f622f6c | 1232 | size_t i; |
36d16f8e BL |
1233 | |
1234 | if ( curr_mtu == 0 ) | |
1235 | return g_probable_mtu[0] ; | |
1236 | ||
1237 | for ( i = 0; i < sizeof(g_probable_mtu)/sizeof(g_probable_mtu[0]); i++) | |
1238 | if ( curr_mtu > g_probable_mtu[i]) | |
1239 | return g_probable_mtu[i]; | |
1240 | ||
1241 | return curr_mtu; | |
1242 | } | |
1243 | ||
1244 | void | |
1245 | dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr) | |
1246 | { | |
1247 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
1248 | msg_hdr->type = *(data++); | |
1249 | n2l3(data, msg_hdr->msg_len); | |
1250 | ||
1251 | n2s(data, msg_hdr->seq); | |
1252 | n2l3(data, msg_hdr->frag_off); | |
1253 | n2l3(data, msg_hdr->frag_len); | |
1254 | } | |
1255 | ||
1256 | void | |
1257 | dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr) | |
1258 | { | |
1259 | memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st)); | |
1260 | ||
1261 | ccs_hdr->type = *(data++); | |
1262 | n2s(data, ccs_hdr->seq); | |
1263 | } |