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36d16f8e | 1 | /* ssl/d1_pkt.c */ |
0f113f3e | 2 | /* |
36d16f8e | 3 | * DTLS implementation written by Nagendra Modadugu |
0f113f3e | 4 | * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. |
36d16f8e BL |
5 | */ |
6 | /* ==================================================================== | |
7 | * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 14 | * notice, this list of conditions and the following disclaimer. |
36d16f8e BL |
15 | * |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
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. | |
0f113f3e | 65 | * |
36d16f8e BL |
66 | * This library is free for commercial and non-commercial use as long as |
67 | * the following conditions are aheared to. The following conditions | |
68 | * apply to all code found in this distribution, be it the RC4, RSA, | |
69 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
70 | * included with this distribution is covered by the same copyright terms | |
71 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 72 | * |
36d16f8e BL |
73 | * Copyright remains Eric Young's, and as such any Copyright notices in |
74 | * the code are not to be removed. | |
75 | * If this package is used in a product, Eric Young should be given attribution | |
76 | * as the author of the parts of the library used. | |
77 | * This can be in the form of a textual message at program startup or | |
78 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 79 | * |
36d16f8e BL |
80 | * Redistribution and use in source and binary forms, with or without |
81 | * modification, are permitted provided that the following conditions | |
82 | * are met: | |
83 | * 1. Redistributions of source code must retain the copyright | |
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 :-). | |
0f113f3e | 94 | * 4. If you include any Windows specific code (or a derivative thereof) from |
36d16f8e BL |
95 | * the apps directory (application code) you must include an acknowledgement: |
96 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 97 | * |
36d16f8e BL |
98 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
99 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
100 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
101 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
102 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
103 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
104 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
105 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
106 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
107 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
108 | * SUCH DAMAGE. | |
0f113f3e | 109 | * |
36d16f8e BL |
110 | * The licence and distribution terms for any publically available version or |
111 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
112 | * copied and put under another distribution licence | |
113 | * [including the GNU Public Licence.] | |
114 | */ | |
115 | ||
116 | #include <stdio.h> | |
117 | #include <errno.h> | |
118 | #define USE_SOCKETS | |
999005e4 | 119 | #include "../ssl_locl.h" |
36d16f8e BL |
120 | #include <openssl/evp.h> |
121 | #include <openssl/buffer.h> | |
122 | #include <openssl/pqueue.h> | |
d527834a | 123 | #include <openssl/rand.h> |
36d16f8e | 124 | |
40f37188 MC |
125 | |
126 | int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl) | |
127 | { | |
128 | DTLS_RECORD_LAYER *d; | |
129 | ||
130 | if ((d = OPENSSL_malloc(sizeof *d)) == NULL) { | |
131 | return (0); | |
132 | } | |
133 | ||
cb2ce7ab | 134 | |
40f37188 | 135 | rl->d = d; |
5fb6f80c | 136 | |
cb2ce7ab MC |
137 | d->unprocessed_rcds.q = pqueue_new(); |
138 | d->processed_rcds.q = pqueue_new(); | |
24a1e2f2 | 139 | d->buffered_app_data.q = pqueue_new(); |
cb2ce7ab | 140 | |
24a1e2f2 MC |
141 | if (!d->unprocessed_rcds.q || !d->processed_rcds.q |
142 | || !d->buffered_app_data.q) { | |
cb2ce7ab MC |
143 | if (d->unprocessed_rcds.q) |
144 | pqueue_free(d->unprocessed_rcds.q); | |
145 | if (d->processed_rcds.q) | |
146 | pqueue_free(d->processed_rcds.q); | |
24a1e2f2 MC |
147 | if (d->buffered_app_data.q) |
148 | pqueue_free(d->buffered_app_data.q); | |
cb2ce7ab MC |
149 | OPENSSL_free(d); |
150 | rl->d = NULL; | |
151 | return (0); | |
152 | } | |
40f37188 MC |
153 | |
154 | return 1; | |
155 | } | |
156 | ||
157 | void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl) | |
158 | { | |
cb2ce7ab MC |
159 | DTLS_RECORD_LAYER_clear(rl); |
160 | pqueue_free(rl->d->unprocessed_rcds.q); | |
161 | pqueue_free(rl->d->processed_rcds.q); | |
24a1e2f2 | 162 | pqueue_free(rl->d->buffered_app_data.q); |
40f37188 MC |
163 | OPENSSL_free(rl->d); |
164 | rl->d = NULL; | |
165 | } | |
166 | ||
167 | void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl) | |
168 | { | |
169 | DTLS_RECORD_LAYER *d; | |
cb2ce7ab MC |
170 | pitem *item = NULL; |
171 | DTLS1_RECORD_DATA *rdata; | |
172 | pqueue unprocessed_rcds; | |
173 | pqueue processed_rcds; | |
24a1e2f2 | 174 | pqueue buffered_app_data; |
cb2ce7ab | 175 | |
40f37188 | 176 | d = rl->d; |
cb2ce7ab MC |
177 | |
178 | while ((item = pqueue_pop(d->unprocessed_rcds.q)) != NULL) { | |
179 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
180 | if (rdata->rbuf.buf) { | |
181 | OPENSSL_free(rdata->rbuf.buf); | |
182 | } | |
183 | OPENSSL_free(item->data); | |
184 | pitem_free(item); | |
185 | } | |
186 | ||
187 | while ((item = pqueue_pop(d->processed_rcds.q)) != NULL) { | |
188 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
189 | if (rdata->rbuf.buf) { | |
190 | OPENSSL_free(rdata->rbuf.buf); | |
191 | } | |
192 | OPENSSL_free(item->data); | |
193 | pitem_free(item); | |
194 | } | |
195 | ||
24a1e2f2 MC |
196 | while ((item = pqueue_pop(d->buffered_app_data.q)) != NULL) { |
197 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
198 | if (rdata->rbuf.buf) { | |
199 | OPENSSL_free(rdata->rbuf.buf); | |
200 | } | |
201 | OPENSSL_free(item->data); | |
202 | pitem_free(item); | |
203 | } | |
204 | ||
cb2ce7ab MC |
205 | unprocessed_rcds = d->unprocessed_rcds.q; |
206 | processed_rcds = d->processed_rcds.q; | |
24a1e2f2 | 207 | buffered_app_data = d->buffered_app_data.q; |
40f37188 | 208 | memset(d, 0, sizeof *d); |
cb2ce7ab MC |
209 | d->unprocessed_rcds.q = unprocessed_rcds; |
210 | d->processed_rcds.q = processed_rcds; | |
24a1e2f2 | 211 | d->buffered_app_data.q = buffered_app_data; |
40f37188 MC |
212 | } |
213 | ||
3bb8f87d MC |
214 | void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e) |
215 | { | |
216 | if (e == rl->d->w_epoch - 1) { | |
217 | memcpy(rl->d->curr_write_sequence, | |
218 | rl->write_sequence, | |
219 | sizeof(rl->write_sequence)); | |
220 | memcpy(rl->write_sequence, | |
221 | rl->d->last_write_sequence, | |
222 | sizeof(rl->write_sequence)); | |
223 | } else if (e == rl->d->w_epoch + 1) { | |
224 | memcpy(rl->d->last_write_sequence, | |
225 | rl->write_sequence, | |
226 | sizeof(unsigned char[8])); | |
227 | memcpy(rl->write_sequence, | |
228 | rl->d->curr_write_sequence, | |
229 | sizeof(rl->write_sequence)); | |
230 | } | |
231 | rl->d->w_epoch = e; | |
232 | } | |
233 | ||
0f113f3e MC |
234 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
235 | int len, int peek); | |
36d16f8e | 236 | |
36d16f8e | 237 | /* copy buffered record into SSL structure */ |
0f113f3e MC |
238 | static int dtls1_copy_record(SSL *s, pitem *item) |
239 | { | |
36d16f8e BL |
240 | DTLS1_RECORD_DATA *rdata; |
241 | ||
242 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
0f113f3e | 243 | |
88c23039 | 244 | SSL3_BUFFER_release(&s->rlayer.rbuf); |
0f113f3e | 245 | |
7a7048af MC |
246 | s->rlayer.packet = rdata->packet; |
247 | s->rlayer.packet_length = rdata->packet_length; | |
88c23039 MC |
248 | memcpy(&s->rlayer.rbuf, &(rdata->rbuf), sizeof(SSL3_BUFFER)); |
249 | memcpy(&s->rlayer.rrec, &(rdata->rrec), sizeof(SSL3_RECORD)); | |
36d16f8e | 250 | |
0f113f3e | 251 | /* Set proper sequence number for mac calculation */ |
de07f311 | 252 | memcpy(&(s->rlayer.read_sequence[2]), &(rdata->packet[5]), 6); |
0f113f3e MC |
253 | |
254 | return (1); | |
255 | } | |
36d16f8e | 256 | |
fe589e61 | 257 | int |
dffdb56b | 258 | dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority) |
0f113f3e MC |
259 | { |
260 | DTLS1_RECORD_DATA *rdata; | |
261 | pitem *item; | |
262 | ||
263 | /* Limit the size of the queue to prevent DOS attacks */ | |
264 | if (pqueue_size(queue->q) >= 100) | |
265 | return 0; | |
266 | ||
267 | rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA)); | |
268 | item = pitem_new(priority, rdata); | |
269 | if (rdata == NULL || item == NULL) { | |
270 | if (rdata != NULL) | |
271 | OPENSSL_free(rdata); | |
272 | if (item != NULL) | |
273 | pitem_free(item); | |
274 | ||
275 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); | |
06c6a2b4 | 276 | return -1; |
0f113f3e MC |
277 | } |
278 | ||
7a7048af MC |
279 | rdata->packet = s->rlayer.packet; |
280 | rdata->packet_length = s->rlayer.packet_length; | |
88c23039 MC |
281 | memcpy(&(rdata->rbuf), &s->rlayer.rbuf, sizeof(SSL3_BUFFER)); |
282 | memcpy(&(rdata->rrec), &s->rlayer.rrec, sizeof(SSL3_RECORD)); | |
0f113f3e MC |
283 | |
284 | item->data = rdata; | |
36d16f8e | 285 | |
7e159e01 | 286 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
287 | /* Store bio_dgram_sctp_rcvinfo struct */ |
288 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
289 | (s->state == SSL3_ST_SR_FINISHED_A | |
290 | || s->state == SSL3_ST_CR_FINISHED_A)) { | |
291 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO, | |
292 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
293 | } | |
7e159e01 DSH |
294 | #endif |
295 | ||
7a7048af MC |
296 | s->rlayer.packet = NULL; |
297 | s->rlayer.packet_length = 0; | |
88c23039 MC |
298 | memset(&s->rlayer.rbuf, 0, sizeof(SSL3_BUFFER)); |
299 | memset(&s->rlayer.rrec, 0, sizeof(SSL3_RECORD)); | |
0f113f3e MC |
300 | |
301 | if (!ssl3_setup_buffers(s)) { | |
302 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); | |
303 | if (rdata->rbuf.buf != NULL) | |
304 | OPENSSL_free(rdata->rbuf.buf); | |
305 | OPENSSL_free(rdata); | |
306 | pitem_free(item); | |
307 | return (-1); | |
308 | } | |
36d16f8e | 309 | |
0f113f3e MC |
310 | /* insert should not fail, since duplicates are dropped */ |
311 | if (pqueue_insert(queue->q, item) == NULL) { | |
312 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); | |
313 | if (rdata->rbuf.buf != NULL) | |
314 | OPENSSL_free(rdata->rbuf.buf); | |
315 | OPENSSL_free(rdata); | |
316 | pitem_free(item); | |
317 | return (-1); | |
318 | } | |
36d16f8e | 319 | |
0f113f3e MC |
320 | return (1); |
321 | } | |
322 | ||
fe589e61 | 323 | int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue) |
0f113f3e | 324 | { |
36d16f8e BL |
325 | pitem *item; |
326 | ||
327 | item = pqueue_pop(queue->q); | |
0f113f3e | 328 | if (item) { |
36d16f8e BL |
329 | dtls1_copy_record(s, item); |
330 | ||
331 | OPENSSL_free(item->data); | |
0f113f3e | 332 | pitem_free(item); |
36d16f8e | 333 | |
0f113f3e | 334 | return (1); |
36d16f8e BL |
335 | } |
336 | ||
0f113f3e MC |
337 | return (0); |
338 | } | |
36d16f8e | 339 | |
0f113f3e MC |
340 | /* |
341 | * retrieve a buffered record that belongs to the new epoch, i.e., not | |
342 | * processed yet | |
343 | */ | |
36d16f8e BL |
344 | #define dtls1_get_unprocessed_record(s) \ |
345 | dtls1_retrieve_buffered_record((s), \ | |
cb2ce7ab | 346 | &((s)->rlayer.d->unprocessed_rcds)) |
36d16f8e | 347 | |
36d16f8e | 348 | |
fe589e61 | 349 | int dtls1_process_buffered_records(SSL *s) |
0f113f3e | 350 | { |
36d16f8e | 351 | pitem *item; |
0f113f3e | 352 | |
cb2ce7ab | 353 | item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q); |
0f113f3e | 354 | if (item) { |
36d16f8e | 355 | /* Check if epoch is current. */ |
cb2ce7ab | 356 | if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch) |
0f113f3e MC |
357 | return (1); /* Nothing to do. */ |
358 | ||
36d16f8e | 359 | /* Process all the records. */ |
cb2ce7ab | 360 | while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) { |
36d16f8e | 361 | dtls1_get_unprocessed_record(s); |
0f113f3e MC |
362 | if (!dtls1_process_record(s)) |
363 | return (0); | |
cb2ce7ab | 364 | if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds), |
88c23039 | 365 | SSL3_RECORD_get_seq_num(&s->rlayer.rrec)) < 0) |
103b171d | 366 | return -1; |
36d16f8e | 367 | } |
0f113f3e | 368 | } |
36d16f8e | 369 | |
0f113f3e MC |
370 | /* |
371 | * sync epoch numbers once all the unprocessed records have been | |
372 | * processed | |
373 | */ | |
cb2ce7ab MC |
374 | s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch; |
375 | s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1; | |
36d16f8e | 376 | |
0f113f3e MC |
377 | return (1); |
378 | } | |
36d16f8e | 379 | |
36d16f8e | 380 | |
1d97c843 TH |
381 | /*- |
382 | * Return up to 'len' payload bytes received in 'type' records. | |
36d16f8e BL |
383 | * 'type' is one of the following: |
384 | * | |
385 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
386 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
387 | * - 0 (during a shutdown, no data has to be returned) | |
388 | * | |
389 | * If we don't have stored data to work from, read a SSL/TLS record first | |
390 | * (possibly multiple records if we still don't have anything to return). | |
391 | * | |
392 | * This function must handle any surprises the peer may have for us, such as | |
393 | * Alert records (e.g. close_notify), ChangeCipherSpec records (not really | |
394 | * a surprise, but handled as if it were), or renegotiation requests. | |
395 | * Also if record payloads contain fragments too small to process, we store | |
396 | * them until there is enough for the respective protocol (the record protocol | |
397 | * may use arbitrary fragmentation and even interleaving): | |
398 | * Change cipher spec protocol | |
399 | * just 1 byte needed, no need for keeping anything stored | |
400 | * Alert protocol | |
401 | * 2 bytes needed (AlertLevel, AlertDescription) | |
402 | * Handshake protocol | |
403 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
404 | * to detect unexpected Client Hello and Hello Request messages | |
405 | * here, anything else is handled by higher layers | |
406 | * Application data protocol | |
407 | * none of our business | |
408 | */ | |
409 | int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) | |
0f113f3e MC |
410 | { |
411 | int al, i, j, ret; | |
412 | unsigned int n; | |
413 | SSL3_RECORD *rr; | |
414 | void (*cb) (const SSL *ssl, int type2, int val) = NULL; | |
415 | ||
88c23039 | 416 | if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) { |
28d59af8 | 417 | /* Not initialized yet */ |
0f113f3e MC |
418 | if (!ssl3_setup_buffers(s)) |
419 | return (-1); | |
28d59af8 | 420 | } |
0f113f3e MC |
421 | |
422 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && | |
423 | (type != SSL3_RT_HANDSHAKE)) || | |
424 | (peek && (type != SSL3_RT_APPLICATION_DATA))) { | |
425 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
426 | return -1; | |
427 | } | |
428 | ||
429 | /* | |
430 | * check whether there's a handshake message (client hello?) waiting | |
431 | */ | |
432 | if ((ret = have_handshake_fragment(s, type, buf, len, peek))) | |
433 | return ret; | |
434 | ||
435 | /* | |
c661ac16 MC |
436 | * Now s->rlayer.d->handshake_fragment_len == 0 if |
437 | * type == SSL3_RT_HANDSHAKE. | |
0f113f3e | 438 | */ |
36d16f8e | 439 | |
7e159e01 | 440 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
441 | /* |
442 | * Continue handshake if it had to be interrupted to read app data with | |
443 | * SCTP. | |
444 | */ | |
445 | if ((!s->in_handshake && SSL_in_init(s)) || | |
446 | (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
447 | (s->state == DTLS1_SCTP_ST_SR_READ_SOCK | |
448 | || s->state == DTLS1_SCTP_ST_CR_READ_SOCK) | |
449 | && s->s3->in_read_app_data != 2)) | |
7e159e01 | 450 | #else |
0f113f3e | 451 | if (!s->in_handshake && SSL_in_init(s)) |
7e159e01 | 452 | #endif |
0f113f3e MC |
453 | { |
454 | /* type == SSL3_RT_APPLICATION_DATA */ | |
455 | i = s->handshake_func(s); | |
456 | if (i < 0) | |
457 | return (i); | |
458 | if (i == 0) { | |
459 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
460 | return (-1); | |
461 | } | |
462 | } | |
463 | ||
464 | start: | |
465 | s->rwstate = SSL_NOTHING; | |
466 | ||
50e735f9 MC |
467 | /*- |
468 | * s->s3->rrec.type - is the type of record | |
469 | * s->s3->rrec.data, - data | |
470 | * s->s3->rrec.off, - offset into 'data' for next read | |
471 | * s->s3->rrec.length, - number of bytes. | |
472 | */ | |
88c23039 | 473 | rr = &s->rlayer.rrec; |
0f113f3e MC |
474 | |
475 | /* | |
476 | * We are not handshaking and have no data yet, so process data buffered | |
477 | * during the last handshake in advance, if any. | |
478 | */ | |
479 | if (s->state == SSL_ST_OK && rr->length == 0) { | |
480 | pitem *item; | |
24a1e2f2 | 481 | item = pqueue_pop(s->rlayer.d->buffered_app_data.q); |
0f113f3e | 482 | if (item) { |
7e159e01 | 483 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
484 | /* Restore bio_dgram_sctp_rcvinfo struct */ |
485 | if (BIO_dgram_is_sctp(SSL_get_rbio(s))) { | |
486 | DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data; | |
487 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO, | |
488 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
489 | } | |
7e159e01 DSH |
490 | #endif |
491 | ||
0f113f3e MC |
492 | dtls1_copy_record(s, item); |
493 | ||
494 | OPENSSL_free(item->data); | |
495 | pitem_free(item); | |
496 | } | |
497 | } | |
498 | ||
499 | /* Check for timeout */ | |
500 | if (dtls1_handle_timeout(s) > 0) | |
501 | goto start; | |
502 | ||
503 | /* get new packet if necessary */ | |
295c3f41 | 504 | if ((rr->length == 0) || (s->rlayer.rstate == SSL_ST_READ_BODY)) { |
0f113f3e MC |
505 | ret = dtls1_get_record(s); |
506 | if (ret <= 0) { | |
507 | ret = dtls1_read_failed(s, ret); | |
508 | /* anything other than a timeout is an error */ | |
509 | if (ret <= 0) | |
510 | return (ret); | |
511 | else | |
512 | goto start; | |
513 | } | |
514 | } | |
515 | ||
516 | if (s->d1->listen && rr->type != SSL3_RT_HANDSHAKE) { | |
517 | rr->length = 0; | |
518 | goto start; | |
519 | } | |
520 | ||
521 | /* we now have a packet which can be read and processed */ | |
522 | ||
523 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, | |
524 | * reset by ssl3_get_finished */ | |
525 | && (rr->type != SSL3_RT_HANDSHAKE)) { | |
526 | /* | |
527 | * We now have application data between CCS and Finished. Most likely | |
528 | * the packets were reordered on their way, so buffer the application | |
529 | * data for later processing rather than dropping the connection. | |
530 | */ | |
24a1e2f2 MC |
531 | if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data), |
532 | rr->seq_num) < 0) { | |
0f113f3e MC |
533 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); |
534 | return -1; | |
535 | } | |
536 | rr->length = 0; | |
537 | goto start; | |
538 | } | |
539 | ||
540 | /* | |
541 | * If the other end has shut down, throw anything we read away (even in | |
542 | * 'peek' mode) | |
543 | */ | |
544 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) { | |
545 | rr->length = 0; | |
546 | s->rwstate = SSL_NOTHING; | |
547 | return (0); | |
548 | } | |
549 | ||
550 | if (type == rr->type) { /* SSL3_RT_APPLICATION_DATA or | |
551 | * SSL3_RT_HANDSHAKE */ | |
552 | /* | |
553 | * make sure that we are not getting application data when we are | |
554 | * doing a handshake for the first time | |
555 | */ | |
556 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
557 | (s->enc_read_ctx == NULL)) { | |
558 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
559 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE); | |
560 | goto f_err; | |
561 | } | |
7e159e01 | 562 | |
0f113f3e MC |
563 | if (len <= 0) |
564 | return (len); | |
565 | ||
566 | if ((unsigned int)len > rr->length) | |
567 | n = rr->length; | |
568 | else | |
569 | n = (unsigned int)len; | |
570 | ||
571 | memcpy(buf, &(rr->data[rr->off]), n); | |
572 | if (!peek) { | |
573 | rr->length -= n; | |
574 | rr->off += n; | |
575 | if (rr->length == 0) { | |
295c3f41 | 576 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
0f113f3e MC |
577 | rr->off = 0; |
578 | } | |
579 | } | |
7e159e01 | 580 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
581 | /* |
582 | * We were about to renegotiate but had to read belated application | |
583 | * data first, so retry. | |
584 | */ | |
585 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
586 | rr->type == SSL3_RT_APPLICATION_DATA && | |
587 | (s->state == DTLS1_SCTP_ST_SR_READ_SOCK | |
588 | || s->state == DTLS1_SCTP_ST_CR_READ_SOCK)) { | |
589 | s->rwstate = SSL_READING; | |
590 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
591 | BIO_set_retry_read(SSL_get_rbio(s)); | |
592 | } | |
593 | ||
594 | /* | |
595 | * We might had to delay a close_notify alert because of reordered | |
596 | * app data. If there was an alert and there is no message to read | |
597 | * anymore, finally set shutdown. | |
598 | */ | |
599 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
600 | s->d1->shutdown_received | |
601 | && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
602 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
603 | return (0); | |
604 | } | |
605 | #endif | |
606 | return (n); | |
607 | } | |
608 | ||
609 | /* | |
610 | * If we get here, then type != rr->type; if we have a handshake message, | |
611 | * then it was unexpected (Hello Request or Client Hello). | |
612 | */ | |
613 | ||
614 | /* | |
615 | * In case of record types for which we have 'fragment' storage, fill | |
616 | * that so that we can process the data at a fixed place. | |
617 | */ | |
618 | { | |
619 | unsigned int k, dest_maxlen = 0; | |
620 | unsigned char *dest = NULL; | |
621 | unsigned int *dest_len = NULL; | |
622 | ||
623 | if (rr->type == SSL3_RT_HANDSHAKE) { | |
c661ac16 MC |
624 | dest_maxlen = sizeof s->rlayer.d->handshake_fragment; |
625 | dest = s->rlayer.d->handshake_fragment; | |
626 | dest_len = &s->rlayer.d->handshake_fragment_len; | |
0f113f3e | 627 | } else if (rr->type == SSL3_RT_ALERT) { |
c661ac16 MC |
628 | dest_maxlen = sizeof(s->rlayer.d->alert_fragment); |
629 | dest = s->rlayer.d->alert_fragment; | |
630 | dest_len = &s->rlayer.d->alert_fragment_len; | |
0f113f3e | 631 | } |
4817504d | 632 | #ifndef OPENSSL_NO_HEARTBEATS |
0f113f3e | 633 | else if (rr->type == TLS1_RT_HEARTBEAT) { |
69f68237 | 634 | /* We allow a 0 return */ |
2c60ed04 MC |
635 | if(dtls1_process_heartbeat(s, SSL3_RECORD_get_data(&s->rlayer.rrec), |
636 | SSL3_RECORD_get_length(&s->rlayer.rrec)) < 0) { | |
69f68237 MC |
637 | return -1; |
638 | } | |
0f113f3e MC |
639 | /* Exit and notify application to read again */ |
640 | rr->length = 0; | |
641 | s->rwstate = SSL_READING; | |
642 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
643 | BIO_set_retry_read(SSL_get_rbio(s)); | |
644 | return (-1); | |
645 | } | |
4817504d | 646 | #endif |
0f113f3e MC |
647 | /* else it's a CCS message, or application data or wrong */ |
648 | else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC) { | |
649 | /* | |
650 | * Application data while renegotiating is allowed. Try again | |
651 | * reading. | |
652 | */ | |
653 | if (rr->type == SSL3_RT_APPLICATION_DATA) { | |
654 | BIO *bio; | |
655 | s->s3->in_read_app_data = 2; | |
656 | bio = SSL_get_rbio(s); | |
657 | s->rwstate = SSL_READING; | |
658 | BIO_clear_retry_flags(bio); | |
659 | BIO_set_retry_read(bio); | |
660 | return (-1); | |
661 | } | |
662 | ||
663 | /* Not certain if this is the right error handling */ | |
664 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
665 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
666 | goto f_err; | |
667 | } | |
668 | ||
669 | if (dest_maxlen > 0) { | |
670 | /* | |
671 | * XDTLS: In a pathalogical case, the Client Hello may be | |
672 | * fragmented--don't always expect dest_maxlen bytes | |
673 | */ | |
674 | if (rr->length < dest_maxlen) { | |
d4938995 | 675 | #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE |
0f113f3e MC |
676 | /* |
677 | * for normal alerts rr->length is 2, while | |
678 | * dest_maxlen is 7 if we were to handle this | |
679 | * non-existing alert... | |
680 | */ | |
681 | FIX ME | |
d4938995 | 682 | #endif |
295c3f41 | 683 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
0f113f3e MC |
684 | rr->length = 0; |
685 | goto start; | |
686 | } | |
687 | ||
688 | /* now move 'n' bytes: */ | |
689 | for (k = 0; k < dest_maxlen; k++) { | |
690 | dest[k] = rr->data[rr->off++]; | |
691 | rr->length--; | |
692 | } | |
693 | *dest_len = dest_maxlen; | |
694 | } | |
695 | } | |
696 | ||
35a1cc90 | 697 | /*- |
c661ac16 MC |
698 | * s->rlayer.d->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE; |
699 | * s->rlayer.d->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT. | |
35a1cc90 MC |
700 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) |
701 | */ | |
0f113f3e MC |
702 | |
703 | /* If we are a client, check for an incoming 'Hello Request': */ | |
704 | if ((!s->server) && | |
c661ac16 MC |
705 | (s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
706 | (s->rlayer.d->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && | |
0f113f3e | 707 | (s->session != NULL) && (s->session->cipher != NULL)) { |
c661ac16 | 708 | s->rlayer.d->handshake_fragment_len = 0; |
0f113f3e | 709 | |
c661ac16 MC |
710 | if ((s->rlayer.d->handshake_fragment[1] != 0) || |
711 | (s->rlayer.d->handshake_fragment[2] != 0) || | |
712 | (s->rlayer.d->handshake_fragment[3] != 0)) { | |
0f113f3e MC |
713 | al = SSL_AD_DECODE_ERROR; |
714 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_HELLO_REQUEST); | |
715 | goto err; | |
716 | } | |
717 | ||
718 | /* | |
719 | * no need to check sequence number on HELLO REQUEST messages | |
720 | */ | |
721 | ||
722 | if (s->msg_callback) | |
723 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
c661ac16 | 724 | s->rlayer.d->handshake_fragment, 4, s, |
0f113f3e MC |
725 | s->msg_callback_arg); |
726 | ||
727 | if (SSL_is_init_finished(s) && | |
728 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && | |
729 | !s->s3->renegotiate) { | |
730 | s->d1->handshake_read_seq++; | |
731 | s->new_session = 1; | |
732 | ssl3_renegotiate(s); | |
733 | if (ssl3_renegotiate_check(s)) { | |
734 | i = s->handshake_func(s); | |
735 | if (i < 0) | |
736 | return (i); | |
737 | if (i == 0) { | |
738 | SSLerr(SSL_F_DTLS1_READ_BYTES, | |
739 | SSL_R_SSL_HANDSHAKE_FAILURE); | |
740 | return (-1); | |
741 | } | |
742 | ||
743 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 744 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 745 | /* no read-ahead left? */ |
0f113f3e MC |
746 | BIO *bio; |
747 | /* | |
748 | * In the case where we try to read application data, | |
749 | * but we trigger an SSL handshake, we return -1 with | |
750 | * the retry option set. Otherwise renegotiation may | |
751 | * cause nasty problems in the blocking world | |
752 | */ | |
753 | s->rwstate = SSL_READING; | |
754 | bio = SSL_get_rbio(s); | |
755 | BIO_clear_retry_flags(bio); | |
756 | BIO_set_retry_read(bio); | |
757 | return (-1); | |
758 | } | |
759 | } | |
760 | } | |
761 | } | |
762 | /* | |
763 | * we either finished a handshake or ignored the request, now try | |
764 | * again to obtain the (application) data we were asked for | |
765 | */ | |
766 | goto start; | |
767 | } | |
768 | ||
c661ac16 MC |
769 | if (s->rlayer.d->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) { |
770 | int alert_level = s->rlayer.d->alert_fragment[0]; | |
771 | int alert_descr = s->rlayer.d->alert_fragment[1]; | |
0f113f3e | 772 | |
c661ac16 | 773 | s->rlayer.d->alert_fragment_len = 0; |
0f113f3e MC |
774 | |
775 | if (s->msg_callback) | |
776 | s->msg_callback(0, s->version, SSL3_RT_ALERT, | |
c661ac16 MC |
777 | s->rlayer.d->alert_fragment, 2, s, |
778 | s->msg_callback_arg); | |
0f113f3e MC |
779 | |
780 | if (s->info_callback != NULL) | |
781 | cb = s->info_callback; | |
782 | else if (s->ctx->info_callback != NULL) | |
783 | cb = s->ctx->info_callback; | |
784 | ||
785 | if (cb != NULL) { | |
786 | j = (alert_level << 8) | alert_descr; | |
787 | cb(s, SSL_CB_READ_ALERT, j); | |
788 | } | |
789 | ||
fd865cad | 790 | if (alert_level == SSL3_AL_WARNING) { |
0f113f3e MC |
791 | s->s3->warn_alert = alert_descr; |
792 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) { | |
7e159e01 | 793 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
794 | /* |
795 | * With SCTP and streams the socket may deliver app data | |
796 | * after a close_notify alert. We have to check this first so | |
797 | * that nothing gets discarded. | |
798 | */ | |
799 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
800 | BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
801 | s->d1->shutdown_received = 1; | |
802 | s->rwstate = SSL_READING; | |
803 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
804 | BIO_set_retry_read(SSL_get_rbio(s)); | |
805 | return -1; | |
806 | } | |
7e159e01 | 807 | #endif |
0f113f3e MC |
808 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; |
809 | return (0); | |
810 | } | |
36d16f8e BL |
811 | #if 0 |
812 | /* XXX: this is a possible improvement in the future */ | |
0f113f3e MC |
813 | /* now check if it's a missing record */ |
814 | if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) { | |
815 | unsigned short seq; | |
816 | unsigned int frag_off; | |
c661ac16 | 817 | unsigned char *p = &(s->rlayer.d->alert_fragment[2]); |
0f113f3e MC |
818 | |
819 | n2s(p, seq); | |
820 | n2l3(p, frag_off); | |
821 | ||
822 | dtls1_retransmit_message(s, | |
823 | dtls1_get_queue_priority | |
824 | (frag->msg_header.seq, 0), frag_off, | |
825 | &found); | |
826 | if (!found && SSL_in_init(s)) { | |
827 | /* | |
828 | * fprintf( stderr,"in init = %d\n", SSL_in_init(s)); | |
829 | */ | |
830 | /* | |
831 | * requested a message not yet sent, send an alert | |
832 | * ourselves | |
833 | */ | |
834 | ssl3_send_alert(s, SSL3_AL_WARNING, | |
835 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); | |
836 | } | |
837 | } | |
36d16f8e | 838 | #endif |
fd865cad | 839 | } else if (alert_level == SSL3_AL_FATAL) { |
0f113f3e MC |
840 | char tmp[16]; |
841 | ||
842 | s->rwstate = SSL_NOTHING; | |
843 | s->s3->fatal_alert = alert_descr; | |
844 | SSLerr(SSL_F_DTLS1_READ_BYTES, | |
845 | SSL_AD_REASON_OFFSET + alert_descr); | |
846 | BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr); | |
847 | ERR_add_error_data(2, "SSL alert number ", tmp); | |
848 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
849 | SSL_CTX_remove_session(s->ctx, s->session); | |
850 | return (0); | |
851 | } else { | |
852 | al = SSL_AD_ILLEGAL_PARAMETER; | |
853 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE); | |
854 | goto f_err; | |
855 | } | |
856 | ||
857 | goto start; | |
858 | } | |
859 | ||
860 | if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a | |
861 | * shutdown */ | |
862 | s->rwstate = SSL_NOTHING; | |
863 | rr->length = 0; | |
864 | return (0); | |
865 | } | |
866 | ||
867 | if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) { | |
868 | struct ccs_header_st ccs_hdr; | |
869 | unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH; | |
870 | ||
871 | dtls1_get_ccs_header(rr->data, &ccs_hdr); | |
872 | ||
873 | if (s->version == DTLS1_BAD_VER) | |
874 | ccs_hdr_len = 3; | |
875 | ||
876 | /* | |
877 | * 'Change Cipher Spec' is just a single byte, so we know exactly | |
878 | * what the record payload has to look like | |
879 | */ | |
880 | /* XDTLS: check that epoch is consistent */ | |
881 | if ((rr->length != ccs_hdr_len) || | |
882 | (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS)) { | |
883 | i = SSL_AD_ILLEGAL_PARAMETER; | |
884 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
885 | goto err; | |
886 | } | |
887 | ||
888 | rr->length = 0; | |
889 | ||
890 | if (s->msg_callback) | |
891 | s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, | |
892 | rr->data, 1, s, s->msg_callback_arg); | |
893 | ||
894 | /* | |
895 | * We can't process a CCS now, because previous handshake messages | |
896 | * are still missing, so just drop it. | |
897 | */ | |
898 | if (!s->d1->change_cipher_spec_ok) { | |
899 | goto start; | |
900 | } | |
901 | ||
902 | s->d1->change_cipher_spec_ok = 0; | |
903 | ||
904 | s->s3->change_cipher_spec = 1; | |
905 | if (!ssl3_do_change_cipher_spec(s)) | |
906 | goto err; | |
907 | ||
908 | /* do this whenever CCS is processed */ | |
909 | dtls1_reset_seq_numbers(s, SSL3_CC_READ); | |
910 | ||
911 | if (s->version == DTLS1_BAD_VER) | |
912 | s->d1->handshake_read_seq++; | |
8711efb4 | 913 | |
7e159e01 | 914 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
915 | /* |
916 | * Remember that a CCS has been received, so that an old key of | |
917 | * SCTP-Auth can be deleted when a CCS is sent. Will be ignored if no | |
918 | * SCTP is used | |
919 | */ | |
920 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL); | |
7e159e01 DSH |
921 | #endif |
922 | ||
0f113f3e MC |
923 | goto start; |
924 | } | |
925 | ||
926 | /* | |
927 | * Unexpected handshake message (Client Hello, or protocol violation) | |
928 | */ | |
c661ac16 | 929 | if ((s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
0f113f3e MC |
930 | !s->in_handshake) { |
931 | struct hm_header_st msg_hdr; | |
932 | ||
933 | /* this may just be a stale retransmit */ | |
934 | dtls1_get_message_header(rr->data, &msg_hdr); | |
78a39fe7 | 935 | if (rr->epoch != s->rlayer.d->r_epoch) { |
0f113f3e MC |
936 | rr->length = 0; |
937 | goto start; | |
938 | } | |
939 | ||
940 | /* | |
941 | * If we are server, we may have a repeated FINISHED of the client | |
942 | * here, then retransmit our CCS and FINISHED. | |
943 | */ | |
944 | if (msg_hdr.type == SSL3_MT_FINISHED) { | |
945 | if (dtls1_check_timeout_num(s) < 0) | |
946 | return -1; | |
947 | ||
17dd65e6 | 948 | dtls1_retransmit_buffered_messages(s); |
0f113f3e MC |
949 | rr->length = 0; |
950 | goto start; | |
951 | } | |
952 | ||
953 | if (((s->state & SSL_ST_MASK) == SSL_ST_OK) && | |
954 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) { | |
0f113f3e | 955 | s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; |
0f113f3e MC |
956 | s->renegotiate = 1; |
957 | s->new_session = 1; | |
958 | } | |
959 | i = s->handshake_func(s); | |
960 | if (i < 0) | |
961 | return (i); | |
962 | if (i == 0) { | |
963 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
964 | return (-1); | |
965 | } | |
966 | ||
967 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 968 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 969 | /* no read-ahead left? */ |
0f113f3e MC |
970 | BIO *bio; |
971 | /* | |
972 | * In the case where we try to read application data, but we | |
973 | * trigger an SSL handshake, we return -1 with the retry | |
974 | * option set. Otherwise renegotiation may cause nasty | |
975 | * problems in the blocking world | |
976 | */ | |
977 | s->rwstate = SSL_READING; | |
978 | bio = SSL_get_rbio(s); | |
979 | BIO_clear_retry_flags(bio); | |
980 | BIO_set_retry_read(bio); | |
981 | return (-1); | |
982 | } | |
983 | } | |
984 | goto start; | |
985 | } | |
986 | ||
987 | switch (rr->type) { | |
988 | default: | |
0f113f3e MC |
989 | /* TLS just ignores unknown message types */ |
990 | if (s->version == TLS1_VERSION) { | |
991 | rr->length = 0; | |
992 | goto start; | |
993 | } | |
0f113f3e MC |
994 | al = SSL_AD_UNEXPECTED_MESSAGE; |
995 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
996 | goto f_err; | |
997 | case SSL3_RT_CHANGE_CIPHER_SPEC: | |
998 | case SSL3_RT_ALERT: | |
999 | case SSL3_RT_HANDSHAKE: | |
1000 | /* | |
1001 | * we already handled all of these, with the possible exception of | |
1002 | * SSL3_RT_HANDSHAKE when s->in_handshake is set, but that should not | |
1003 | * happen when type != rr->type | |
1004 | */ | |
1005 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
1006 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
1007 | goto f_err; | |
1008 | case SSL3_RT_APPLICATION_DATA: | |
1009 | /* | |
1010 | * At this point, we were expecting handshake data, but have | |
1011 | * application data. If the library was running inside ssl3_read() | |
1012 | * (i.e. in_read_app_data is set) and it makes sense to read | |
1013 | * application data at this point (session renegotiation not yet | |
1014 | * started), we will indulge it. | |
1015 | */ | |
1016 | if (s->s3->in_read_app_data && | |
1017 | (s->s3->total_renegotiations != 0) && | |
1018 | (((s->state & SSL_ST_CONNECT) && | |
1019 | (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && | |
1020 | (s->state <= SSL3_ST_CR_SRVR_HELLO_A) | |
1021 | ) || ((s->state & SSL_ST_ACCEPT) && | |
1022 | (s->state <= SSL3_ST_SW_HELLO_REQ_A) && | |
1023 | (s->state >= SSL3_ST_SR_CLNT_HELLO_A) | |
1024 | ) | |
1025 | )) { | |
1026 | s->s3->in_read_app_data = 2; | |
1027 | return (-1); | |
1028 | } else { | |
1029 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
1030 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
1031 | goto f_err; | |
1032 | } | |
1033 | } | |
1034 | /* not reached */ | |
1035 | ||
1036 | f_err: | |
1037 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1038 | err: | |
1039 | return (-1); | |
1040 | } | |
1041 | ||
0f113f3e MC |
1042 | |
1043 | /* | |
1044 | * this only happens when a client hello is received and a handshake | |
1045 | * is started. | |
1046 | */ | |
36d16f8e | 1047 | static int |
0f113f3e MC |
1048 | have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
1049 | int len, int peek) | |
1050 | { | |
1051 | ||
c661ac16 MC |
1052 | if ((type == SSL3_RT_HANDSHAKE) |
1053 | && (s->rlayer.d->handshake_fragment_len > 0)) | |
0f113f3e MC |
1054 | /* (partially) satisfy request from storage */ |
1055 | { | |
c661ac16 | 1056 | unsigned char *src = s->rlayer.d->handshake_fragment; |
0f113f3e MC |
1057 | unsigned char *dst = buf; |
1058 | unsigned int k, n; | |
1059 | ||
1060 | /* peek == 0 */ | |
1061 | n = 0; | |
c661ac16 | 1062 | while ((len > 0) && (s->rlayer.d->handshake_fragment_len > 0)) { |
0f113f3e MC |
1063 | *dst++ = *src++; |
1064 | len--; | |
c661ac16 | 1065 | s->rlayer.d->handshake_fragment_len--; |
0f113f3e MC |
1066 | n++; |
1067 | } | |
1068 | /* move any remaining fragment bytes: */ | |
c661ac16 MC |
1069 | for (k = 0; k < s->rlayer.d->handshake_fragment_len; k++) |
1070 | s->rlayer.d->handshake_fragment[k] = *src++; | |
0f113f3e MC |
1071 | return n; |
1072 | } | |
1073 | ||
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Call this to write data in records of type 'type' It will return <= 0 if | |
1079 | * not all data has been sent or non-blocking IO. | |
36d16f8e | 1080 | */ |
480b9e5d | 1081 | int dtls1_write_bytes(SSL *s, int type, const void *buf, int len) |
0f113f3e MC |
1082 | { |
1083 | int i; | |
1084 | ||
1085 | OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH); | |
1086 | s->rwstate = SSL_NOTHING; | |
1087 | i = do_dtls1_write(s, type, buf, len, 0); | |
1088 | return i; | |
1089 | } | |
1090 | ||
1091 | int do_dtls1_write(SSL *s, int type, const unsigned char *buf, | |
1092 | unsigned int len, int create_empty_fragment) | |
1093 | { | |
1094 | unsigned char *p, *pseq; | |
1095 | int i, mac_size, clear = 0; | |
1096 | int prefix_len = 0; | |
1097 | int eivlen; | |
1098 | SSL3_RECORD *wr; | |
1099 | SSL3_BUFFER *wb; | |
1100 | SSL_SESSION *sess; | |
1101 | ||
88c23039 | 1102 | wb = &s->rlayer.wbuf; |
db9a32e7 | 1103 | |
0f113f3e MC |
1104 | /* |
1105 | * first check if there is a SSL3_BUFFER still being written out. This | |
1106 | * will happen with non blocking IO | |
1107 | */ | |
db9a32e7 | 1108 | if (SSL3_BUFFER_get_left(wb) != 0) { |
0f113f3e MC |
1109 | OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */ |
1110 | return (ssl3_write_pending(s, type, buf, len)); | |
1111 | } | |
1112 | ||
1113 | /* If we have an alert to send, lets send it */ | |
1114 | if (s->s3->alert_dispatch) { | |
1115 | i = s->method->ssl_dispatch_alert(s); | |
1116 | if (i <= 0) | |
1117 | return (i); | |
1118 | /* if it went, fall through and send more stuff */ | |
1119 | } | |
1120 | ||
1121 | if (len == 0 && !create_empty_fragment) | |
1122 | return 0; | |
1123 | ||
88c23039 | 1124 | wr = &s->rlayer.wrec; |
0f113f3e MC |
1125 | sess = s->session; |
1126 | ||
1127 | if ((sess == NULL) || | |
1128 | (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL)) | |
1129 | clear = 1; | |
1130 | ||
1131 | if (clear) | |
1132 | mac_size = 0; | |
1133 | else { | |
1134 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
1135 | if (mac_size < 0) | |
1136 | goto err; | |
1137 | } | |
1138 | ||
0f113f3e MC |
1139 | p = wb->buf + prefix_len; |
1140 | ||
1141 | /* write the header */ | |
1142 | ||
1143 | *(p++) = type & 0xff; | |
1144 | wr->type = type; | |
1145 | /* | |
1146 | * Special case: for hello verify request, client version 1.0 and we | |
1147 | * haven't decided which version to use yet send back using version 1.0 | |
1148 | * header: otherwise some clients will ignore it. | |
1149 | */ | |
1150 | if (s->method->version == DTLS_ANY_VERSION) { | |
1151 | *(p++) = DTLS1_VERSION >> 8; | |
1152 | *(p++) = DTLS1_VERSION & 0xff; | |
1153 | } else { | |
1154 | *(p++) = s->version >> 8; | |
1155 | *(p++) = s->version & 0xff; | |
1156 | } | |
1157 | ||
1158 | /* field where we are to write out packet epoch, seq num and len */ | |
1159 | pseq = p; | |
1160 | p += 10; | |
1161 | ||
1162 | /* Explicit IV length, block ciphers appropriate version flag */ | |
1163 | if (s->enc_write_ctx) { | |
1164 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx); | |
1165 | if (mode == EVP_CIPH_CBC_MODE) { | |
1166 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx); | |
1167 | if (eivlen <= 1) | |
1168 | eivlen = 0; | |
1169 | } | |
1170 | /* Need explicit part of IV for GCM mode */ | |
1171 | else if (mode == EVP_CIPH_GCM_MODE) | |
1172 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
1173 | else | |
1174 | eivlen = 0; | |
1175 | } else | |
1176 | eivlen = 0; | |
1177 | ||
1178 | /* lets setup the record stuff. */ | |
1179 | wr->data = p + eivlen; /* make room for IV in case of CBC */ | |
1180 | wr->length = (int)len; | |
1181 | wr->input = (unsigned char *)buf; | |
1182 | ||
1183 | /* | |
1184 | * we now 'read' from wr->input, wr->length bytes into wr->data | |
1185 | */ | |
1186 | ||
1187 | /* first we compress */ | |
1188 | if (s->compress != NULL) { | |
1189 | if (!ssl3_do_compress(s)) { | |
1190 | SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_COMPRESSION_FAILURE); | |
1191 | goto err; | |
1192 | } | |
1193 | } else { | |
1194 | memcpy(wr->data, wr->input, wr->length); | |
1195 | wr->input = wr->data; | |
1196 | } | |
36d16f8e | 1197 | |
0f113f3e MC |
1198 | /* |
1199 | * we should still have the output to wr->data and the input from | |
1200 | * wr->input. Length should be wr->length. wr->data still points in the | |
1201 | * wb->buf | |
1202 | */ | |
36d16f8e | 1203 | |
0f113f3e MC |
1204 | if (mac_size != 0) { |
1205 | if (s->method->ssl3_enc->mac(s, &(p[wr->length + eivlen]), 1) < 0) | |
1206 | goto err; | |
1207 | wr->length += mac_size; | |
1208 | } | |
36d16f8e | 1209 | |
0f113f3e MC |
1210 | /* this is true regardless of mac size */ |
1211 | wr->input = p; | |
1212 | wr->data = p; | |
36d16f8e | 1213 | |
0f113f3e MC |
1214 | if (eivlen) |
1215 | wr->length += eivlen; | |
36d16f8e | 1216 | |
0f113f3e MC |
1217 | if (s->method->ssl3_enc->enc(s, 1) < 1) |
1218 | goto err; | |
36d16f8e | 1219 | |
0f113f3e MC |
1220 | /* record length after mac and block padding */ |
1221 | /* | |
1222 | * if (type == SSL3_RT_APPLICATION_DATA || (type == SSL3_RT_ALERT && ! | |
1223 | * SSL_in_init(s))) | |
1224 | */ | |
36d16f8e | 1225 | |
0f113f3e | 1226 | /* there's only one epoch between handshake and app data */ |
36d16f8e | 1227 | |
78a39fe7 | 1228 | s2n(s->rlayer.d->w_epoch, pseq); |
36d16f8e | 1229 | |
0f113f3e MC |
1230 | /* XDTLS: ?? */ |
1231 | /* | |
1232 | * else s2n(s->d1->handshake_epoch, pseq); | |
1233 | */ | |
36d16f8e | 1234 | |
de07f311 | 1235 | memcpy(pseq, &(s->rlayer.write_sequence[2]), 6); |
0f113f3e MC |
1236 | pseq += 6; |
1237 | s2n(wr->length, pseq); | |
36d16f8e | 1238 | |
0f113f3e MC |
1239 | if (s->msg_callback) |
1240 | s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH, | |
1241 | DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg); | |
36d16f8e | 1242 | |
0f113f3e MC |
1243 | /* |
1244 | * we should now have wr->data pointing to the encrypted data, which is | |
1245 | * wr->length long | |
1246 | */ | |
1247 | wr->type = type; /* not needed but helps for debugging */ | |
1248 | wr->length += DTLS1_RT_HEADER_LENGTH; | |
36d16f8e | 1249 | |
de07f311 | 1250 | ssl3_record_sequence_update(&(s->rlayer.write_sequence[0])); |
36d16f8e | 1251 | |
0f113f3e MC |
1252 | if (create_empty_fragment) { |
1253 | /* | |
1254 | * we are in a recursive call; just return the length, don't write | |
1255 | * out anything here | |
1256 | */ | |
1257 | return wr->length; | |
1258 | } | |
36d16f8e | 1259 | |
0f113f3e MC |
1260 | /* now let's set up wb */ |
1261 | wb->left = prefix_len + wr->length; | |
1262 | wb->offset = 0; | |
1263 | ||
1264 | /* | |
1265 | * memorize arguments so that ssl3_write_pending can detect bad write | |
1266 | * retries later | |
1267 | */ | |
f8caa3c8 MC |
1268 | s->rlayer.wpend_tot = len; |
1269 | s->rlayer.wpend_buf = buf; | |
1270 | s->rlayer.wpend_type = type; | |
1271 | s->rlayer.wpend_ret = len; | |
0f113f3e MC |
1272 | |
1273 | /* we now just need to write the buffer */ | |
1274 | return ssl3_write_pending(s, type, buf, len); | |
1275 | err: | |
1276 | return -1; | |
1277 | } | |
36d16f8e | 1278 | |
fe589e61 | 1279 | DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, |
0f113f3e MC |
1280 | unsigned int *is_next_epoch) |
1281 | { | |
1282 | ||
36d16f8e BL |
1283 | *is_next_epoch = 0; |
1284 | ||
1285 | /* In current epoch, accept HM, CCS, DATA, & ALERT */ | |
78a39fe7 | 1286 | if (rr->epoch == s->rlayer.d->r_epoch) |
91f93f69 | 1287 | return &s->rlayer.d->bitmap; |
36d16f8e BL |
1288 | |
1289 | /* Only HM and ALERT messages can be from the next epoch */ | |
78a39fe7 MC |
1290 | else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) && |
1291 | (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) { | |
36d16f8e | 1292 | *is_next_epoch = 1; |
91f93f69 | 1293 | return &s->rlayer.d->next_bitmap; |
0f113f3e | 1294 | } |
36d16f8e BL |
1295 | |
1296 | return NULL; | |
0f113f3e | 1297 | } |
36d16f8e | 1298 | |
0f113f3e MC |
1299 | void dtls1_reset_seq_numbers(SSL *s, int rw) |
1300 | { | |
1301 | unsigned char *seq; | |
de07f311 | 1302 | unsigned int seq_bytes = sizeof(s->rlayer.read_sequence); |
0f113f3e MC |
1303 | |
1304 | if (rw & SSL3_CC_READ) { | |
de07f311 | 1305 | seq = s->rlayer.read_sequence; |
78a39fe7 | 1306 | s->rlayer.d->r_epoch++; |
c661ac16 MC |
1307 | memcpy(&(s->rlayer.d->bitmap), &(s->rlayer.d->next_bitmap), |
1308 | sizeof(DTLS1_BITMAP)); | |
91f93f69 | 1309 | memset(&(s->rlayer.d->next_bitmap), 0x00, sizeof(DTLS1_BITMAP)); |
0f113f3e | 1310 | } else { |
de07f311 | 1311 | seq = s->rlayer.write_sequence; |
3bb8f87d | 1312 | memcpy(s->rlayer.d->last_write_sequence, seq, |
de07f311 | 1313 | sizeof(s->rlayer.write_sequence)); |
78a39fe7 | 1314 | s->rlayer.d->w_epoch++; |
0f113f3e MC |
1315 | } |
1316 | ||
1317 | memset(seq, 0x00, seq_bytes); | |
1318 | } |