]>
Commit | Line | Data |
---|---|---|
1711f8de | 1 | /* ssl/record/rec_layer_d1.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> |
1711f8de | 124 | #include "record_locl.h" |
40f37188 MC |
125 | |
126 | int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl) | |
127 | { | |
128 | DTLS_RECORD_LAYER *d; | |
129 | ||
b4faea50 | 130 | if ((d = OPENSSL_malloc(sizeof(*d))) == NULL) |
40f37188 | 131 | return (0); |
40f37188 | 132 | |
cb2ce7ab | 133 | |
40f37188 | 134 | rl->d = d; |
5fb6f80c | 135 | |
cb2ce7ab MC |
136 | d->unprocessed_rcds.q = pqueue_new(); |
137 | d->processed_rcds.q = pqueue_new(); | |
24a1e2f2 | 138 | d->buffered_app_data.q = pqueue_new(); |
cb2ce7ab | 139 | |
24a1e2f2 MC |
140 | if (!d->unprocessed_rcds.q || !d->processed_rcds.q |
141 | || !d->buffered_app_data.q) { | |
25aaa98a RS |
142 | pqueue_free(d->unprocessed_rcds.q); |
143 | pqueue_free(d->processed_rcds.q); | |
144 | pqueue_free(d->buffered_app_data.q); | |
cb2ce7ab MC |
145 | OPENSSL_free(d); |
146 | rl->d = NULL; | |
147 | return (0); | |
148 | } | |
40f37188 MC |
149 | |
150 | return 1; | |
151 | } | |
152 | ||
153 | void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl) | |
154 | { | |
cb2ce7ab MC |
155 | DTLS_RECORD_LAYER_clear(rl); |
156 | pqueue_free(rl->d->unprocessed_rcds.q); | |
157 | pqueue_free(rl->d->processed_rcds.q); | |
24a1e2f2 | 158 | pqueue_free(rl->d->buffered_app_data.q); |
40f37188 MC |
159 | OPENSSL_free(rl->d); |
160 | rl->d = NULL; | |
161 | } | |
162 | ||
163 | void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl) | |
164 | { | |
165 | DTLS_RECORD_LAYER *d; | |
cb2ce7ab MC |
166 | pitem *item = NULL; |
167 | DTLS1_RECORD_DATA *rdata; | |
168 | pqueue unprocessed_rcds; | |
169 | pqueue processed_rcds; | |
24a1e2f2 | 170 | pqueue buffered_app_data; |
cb2ce7ab | 171 | |
40f37188 | 172 | d = rl->d; |
cb2ce7ab MC |
173 | |
174 | while ((item = pqueue_pop(d->unprocessed_rcds.q)) != NULL) { | |
175 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
b548a1f1 | 176 | OPENSSL_free(rdata->rbuf.buf); |
cb2ce7ab MC |
177 | OPENSSL_free(item->data); |
178 | pitem_free(item); | |
179 | } | |
180 | ||
181 | while ((item = pqueue_pop(d->processed_rcds.q)) != NULL) { | |
182 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
b548a1f1 | 183 | OPENSSL_free(rdata->rbuf.buf); |
cb2ce7ab MC |
184 | OPENSSL_free(item->data); |
185 | pitem_free(item); | |
186 | } | |
187 | ||
24a1e2f2 MC |
188 | while ((item = pqueue_pop(d->buffered_app_data.q)) != NULL) { |
189 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
b548a1f1 | 190 | OPENSSL_free(rdata->rbuf.buf); |
24a1e2f2 MC |
191 | OPENSSL_free(item->data); |
192 | pitem_free(item); | |
193 | } | |
194 | ||
cb2ce7ab MC |
195 | unprocessed_rcds = d->unprocessed_rcds.q; |
196 | processed_rcds = d->processed_rcds.q; | |
24a1e2f2 | 197 | buffered_app_data = d->buffered_app_data.q; |
b4faea50 | 198 | memset(d, 0, sizeof(*d)); |
cb2ce7ab MC |
199 | d->unprocessed_rcds.q = unprocessed_rcds; |
200 | d->processed_rcds.q = processed_rcds; | |
24a1e2f2 | 201 | d->buffered_app_data.q = buffered_app_data; |
40f37188 MC |
202 | } |
203 | ||
3bb8f87d MC |
204 | void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e) |
205 | { | |
206 | if (e == rl->d->w_epoch - 1) { | |
207 | memcpy(rl->d->curr_write_sequence, | |
208 | rl->write_sequence, | |
209 | sizeof(rl->write_sequence)); | |
210 | memcpy(rl->write_sequence, | |
211 | rl->d->last_write_sequence, | |
212 | sizeof(rl->write_sequence)); | |
213 | } else if (e == rl->d->w_epoch + 1) { | |
214 | memcpy(rl->d->last_write_sequence, | |
215 | rl->write_sequence, | |
216 | sizeof(unsigned char[8])); | |
217 | memcpy(rl->write_sequence, | |
218 | rl->d->curr_write_sequence, | |
219 | sizeof(rl->write_sequence)); | |
220 | } | |
221 | rl->d->w_epoch = e; | |
222 | } | |
223 | ||
44cc35d3 MC |
224 | void DTLS_RECORD_LAYER_resync_write(RECORD_LAYER *rl) |
225 | { | |
226 | memcpy(rl->write_sequence, rl->read_sequence, sizeof(rl->write_sequence)); | |
227 | } | |
228 | ||
0f113f3e MC |
229 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
230 | int len, int peek); | |
36d16f8e | 231 | |
36d16f8e | 232 | /* copy buffered record into SSL structure */ |
0f113f3e MC |
233 | static int dtls1_copy_record(SSL *s, pitem *item) |
234 | { | |
36d16f8e BL |
235 | DTLS1_RECORD_DATA *rdata; |
236 | ||
237 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
0f113f3e | 238 | |
88c23039 | 239 | SSL3_BUFFER_release(&s->rlayer.rbuf); |
0f113f3e | 240 | |
7a7048af MC |
241 | s->rlayer.packet = rdata->packet; |
242 | s->rlayer.packet_length = rdata->packet_length; | |
88c23039 MC |
243 | memcpy(&s->rlayer.rbuf, &(rdata->rbuf), sizeof(SSL3_BUFFER)); |
244 | memcpy(&s->rlayer.rrec, &(rdata->rrec), sizeof(SSL3_RECORD)); | |
36d16f8e | 245 | |
0f113f3e | 246 | /* Set proper sequence number for mac calculation */ |
de07f311 | 247 | memcpy(&(s->rlayer.read_sequence[2]), &(rdata->packet[5]), 6); |
0f113f3e MC |
248 | |
249 | return (1); | |
250 | } | |
36d16f8e | 251 | |
6f7ae319 | 252 | int dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority) |
0f113f3e MC |
253 | { |
254 | DTLS1_RECORD_DATA *rdata; | |
255 | pitem *item; | |
256 | ||
257 | /* Limit the size of the queue to prevent DOS attacks */ | |
258 | if (pqueue_size(queue->q) >= 100) | |
259 | return 0; | |
260 | ||
b4faea50 | 261 | rdata = OPENSSL_malloc(sizeof(*rdata)); |
0f113f3e MC |
262 | item = pitem_new(priority, rdata); |
263 | if (rdata == NULL || item == NULL) { | |
b548a1f1 | 264 | OPENSSL_free(rdata); |
25aaa98a | 265 | pitem_free(item); |
0f113f3e | 266 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); |
06c6a2b4 | 267 | return -1; |
0f113f3e MC |
268 | } |
269 | ||
7a7048af MC |
270 | rdata->packet = s->rlayer.packet; |
271 | rdata->packet_length = s->rlayer.packet_length; | |
88c23039 MC |
272 | memcpy(&(rdata->rbuf), &s->rlayer.rbuf, sizeof(SSL3_BUFFER)); |
273 | memcpy(&(rdata->rrec), &s->rlayer.rrec, sizeof(SSL3_RECORD)); | |
0f113f3e MC |
274 | |
275 | item->data = rdata; | |
36d16f8e | 276 | |
7e159e01 | 277 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
278 | /* Store bio_dgram_sctp_rcvinfo struct */ |
279 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
280 | (s->state == SSL3_ST_SR_FINISHED_A | |
281 | || s->state == SSL3_ST_CR_FINISHED_A)) { | |
282 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO, | |
283 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
284 | } | |
7e159e01 DSH |
285 | #endif |
286 | ||
7a7048af MC |
287 | s->rlayer.packet = NULL; |
288 | s->rlayer.packet_length = 0; | |
16f8d4eb RS |
289 | memset(&s->rlayer.rbuf, 0, sizeof(s->rlayer.rbuf)); |
290 | memset(&s->rlayer.rrec, 0, sizeof(s->rlayer.rrec)); | |
0f113f3e MC |
291 | |
292 | if (!ssl3_setup_buffers(s)) { | |
293 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); | |
b548a1f1 | 294 | OPENSSL_free(rdata->rbuf.buf); |
0f113f3e MC |
295 | OPENSSL_free(rdata); |
296 | pitem_free(item); | |
297 | return (-1); | |
298 | } | |
36d16f8e | 299 | |
0f113f3e MC |
300 | /* insert should not fail, since duplicates are dropped */ |
301 | if (pqueue_insert(queue->q, item) == NULL) { | |
302 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); | |
b548a1f1 | 303 | OPENSSL_free(rdata->rbuf.buf); |
0f113f3e MC |
304 | OPENSSL_free(rdata); |
305 | pitem_free(item); | |
306 | return (-1); | |
307 | } | |
36d16f8e | 308 | |
0f113f3e MC |
309 | return (1); |
310 | } | |
311 | ||
fe589e61 | 312 | int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue) |
0f113f3e | 313 | { |
36d16f8e BL |
314 | pitem *item; |
315 | ||
316 | item = pqueue_pop(queue->q); | |
0f113f3e | 317 | if (item) { |
36d16f8e BL |
318 | dtls1_copy_record(s, item); |
319 | ||
320 | OPENSSL_free(item->data); | |
0f113f3e | 321 | pitem_free(item); |
36d16f8e | 322 | |
0f113f3e | 323 | return (1); |
36d16f8e BL |
324 | } |
325 | ||
0f113f3e MC |
326 | return (0); |
327 | } | |
36d16f8e | 328 | |
0f113f3e MC |
329 | /* |
330 | * retrieve a buffered record that belongs to the new epoch, i.e., not | |
331 | * processed yet | |
332 | */ | |
36d16f8e BL |
333 | #define dtls1_get_unprocessed_record(s) \ |
334 | dtls1_retrieve_buffered_record((s), \ | |
cb2ce7ab | 335 | &((s)->rlayer.d->unprocessed_rcds)) |
36d16f8e | 336 | |
36d16f8e | 337 | |
fe589e61 | 338 | int dtls1_process_buffered_records(SSL *s) |
0f113f3e | 339 | { |
36d16f8e | 340 | pitem *item; |
0f113f3e | 341 | |
cb2ce7ab | 342 | item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q); |
0f113f3e | 343 | if (item) { |
36d16f8e | 344 | /* Check if epoch is current. */ |
cb2ce7ab | 345 | if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch) |
0f113f3e MC |
346 | return (1); /* Nothing to do. */ |
347 | ||
36d16f8e | 348 | /* Process all the records. */ |
cb2ce7ab | 349 | while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) { |
36d16f8e | 350 | dtls1_get_unprocessed_record(s); |
0f113f3e MC |
351 | if (!dtls1_process_record(s)) |
352 | return (0); | |
cb2ce7ab | 353 | if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds), |
88c23039 | 354 | SSL3_RECORD_get_seq_num(&s->rlayer.rrec)) < 0) |
103b171d | 355 | return -1; |
36d16f8e | 356 | } |
0f113f3e | 357 | } |
36d16f8e | 358 | |
0f113f3e MC |
359 | /* |
360 | * sync epoch numbers once all the unprocessed records have been | |
361 | * processed | |
362 | */ | |
cb2ce7ab MC |
363 | s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch; |
364 | s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1; | |
36d16f8e | 365 | |
0f113f3e MC |
366 | return (1); |
367 | } | |
36d16f8e | 368 | |
36d16f8e | 369 | |
1d97c843 TH |
370 | /*- |
371 | * Return up to 'len' payload bytes received in 'type' records. | |
36d16f8e BL |
372 | * 'type' is one of the following: |
373 | * | |
374 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
375 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
376 | * - 0 (during a shutdown, no data has to be returned) | |
377 | * | |
378 | * If we don't have stored data to work from, read a SSL/TLS record first | |
379 | * (possibly multiple records if we still don't have anything to return). | |
380 | * | |
381 | * This function must handle any surprises the peer may have for us, such as | |
382 | * Alert records (e.g. close_notify), ChangeCipherSpec records (not really | |
383 | * a surprise, but handled as if it were), or renegotiation requests. | |
384 | * Also if record payloads contain fragments too small to process, we store | |
385 | * them until there is enough for the respective protocol (the record protocol | |
386 | * may use arbitrary fragmentation and even interleaving): | |
387 | * Change cipher spec protocol | |
388 | * just 1 byte needed, no need for keeping anything stored | |
389 | * Alert protocol | |
390 | * 2 bytes needed (AlertLevel, AlertDescription) | |
391 | * Handshake protocol | |
392 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
393 | * to detect unexpected Client Hello and Hello Request messages | |
394 | * here, anything else is handled by higher layers | |
395 | * Application data protocol | |
396 | * none of our business | |
397 | */ | |
657da85e MC |
398 | int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf, |
399 | int len, int peek) | |
0f113f3e MC |
400 | { |
401 | int al, i, j, ret; | |
402 | unsigned int n; | |
403 | SSL3_RECORD *rr; | |
404 | void (*cb) (const SSL *ssl, int type2, int val) = NULL; | |
405 | ||
88c23039 | 406 | if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) { |
28d59af8 | 407 | /* Not initialized yet */ |
0f113f3e MC |
408 | if (!ssl3_setup_buffers(s)) |
409 | return (-1); | |
28d59af8 | 410 | } |
0f113f3e MC |
411 | |
412 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && | |
413 | (type != SSL3_RT_HANDSHAKE)) || | |
414 | (peek && (type != SSL3_RT_APPLICATION_DATA))) { | |
415 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
416 | return -1; | |
417 | } | |
418 | ||
419 | /* | |
420 | * check whether there's a handshake message (client hello?) waiting | |
421 | */ | |
422 | if ((ret = have_handshake_fragment(s, type, buf, len, peek))) | |
423 | return ret; | |
424 | ||
425 | /* | |
c661ac16 MC |
426 | * Now s->rlayer.d->handshake_fragment_len == 0 if |
427 | * type == SSL3_RT_HANDSHAKE. | |
0f113f3e | 428 | */ |
36d16f8e | 429 | |
7e159e01 | 430 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
431 | /* |
432 | * Continue handshake if it had to be interrupted to read app data with | |
433 | * SCTP. | |
434 | */ | |
435 | if ((!s->in_handshake && SSL_in_init(s)) || | |
436 | (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
437 | (s->state == DTLS1_SCTP_ST_SR_READ_SOCK | |
438 | || s->state == DTLS1_SCTP_ST_CR_READ_SOCK) | |
439 | && s->s3->in_read_app_data != 2)) | |
7e159e01 | 440 | #else |
0f113f3e | 441 | if (!s->in_handshake && SSL_in_init(s)) |
7e159e01 | 442 | #endif |
0f113f3e MC |
443 | { |
444 | /* type == SSL3_RT_APPLICATION_DATA */ | |
445 | i = s->handshake_func(s); | |
446 | if (i < 0) | |
447 | return (i); | |
448 | if (i == 0) { | |
449 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
450 | return (-1); | |
451 | } | |
452 | } | |
453 | ||
454 | start: | |
455 | s->rwstate = SSL_NOTHING; | |
456 | ||
50e735f9 MC |
457 | /*- |
458 | * s->s3->rrec.type - is the type of record | |
459 | * s->s3->rrec.data, - data | |
460 | * s->s3->rrec.off, - offset into 'data' for next read | |
461 | * s->s3->rrec.length, - number of bytes. | |
462 | */ | |
88c23039 | 463 | rr = &s->rlayer.rrec; |
0f113f3e MC |
464 | |
465 | /* | |
466 | * We are not handshaking and have no data yet, so process data buffered | |
467 | * during the last handshake in advance, if any. | |
468 | */ | |
747e1639 | 469 | if (s->state == SSL_ST_OK && SSL3_RECORD_get_length(rr) == 0) { |
0f113f3e | 470 | pitem *item; |
24a1e2f2 | 471 | item = pqueue_pop(s->rlayer.d->buffered_app_data.q); |
0f113f3e | 472 | if (item) { |
7e159e01 | 473 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
474 | /* Restore bio_dgram_sctp_rcvinfo struct */ |
475 | if (BIO_dgram_is_sctp(SSL_get_rbio(s))) { | |
476 | DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data; | |
477 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO, | |
478 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
479 | } | |
7e159e01 DSH |
480 | #endif |
481 | ||
0f113f3e MC |
482 | dtls1_copy_record(s, item); |
483 | ||
484 | OPENSSL_free(item->data); | |
485 | pitem_free(item); | |
486 | } | |
487 | } | |
488 | ||
489 | /* Check for timeout */ | |
490 | if (dtls1_handle_timeout(s) > 0) | |
491 | goto start; | |
492 | ||
493 | /* get new packet if necessary */ | |
747e1639 MC |
494 | if ((SSL3_RECORD_get_length(rr) == 0) |
495 | || (s->rlayer.rstate == SSL_ST_READ_BODY)) { | |
0f113f3e MC |
496 | ret = dtls1_get_record(s); |
497 | if (ret <= 0) { | |
498 | ret = dtls1_read_failed(s, ret); | |
499 | /* anything other than a timeout is an error */ | |
500 | if (ret <= 0) | |
501 | return (ret); | |
502 | else | |
503 | goto start; | |
504 | } | |
505 | } | |
506 | ||
507 | if (s->d1->listen && rr->type != SSL3_RT_HANDSHAKE) { | |
747e1639 | 508 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
509 | goto start; |
510 | } | |
511 | ||
512 | /* we now have a packet which can be read and processed */ | |
513 | ||
514 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, | |
515 | * reset by ssl3_get_finished */ | |
747e1639 | 516 | && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) { |
0f113f3e MC |
517 | /* |
518 | * We now have application data between CCS and Finished. Most likely | |
519 | * the packets were reordered on their way, so buffer the application | |
520 | * data for later processing rather than dropping the connection. | |
521 | */ | |
24a1e2f2 | 522 | if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data), |
747e1639 | 523 | SSL3_RECORD_get_seq_num(rr)) < 0) { |
0f113f3e MC |
524 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); |
525 | return -1; | |
526 | } | |
747e1639 | 527 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
528 | goto start; |
529 | } | |
530 | ||
531 | /* | |
532 | * If the other end has shut down, throw anything we read away (even in | |
533 | * 'peek' mode) | |
534 | */ | |
535 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) { | |
747e1639 | 536 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
537 | s->rwstate = SSL_NOTHING; |
538 | return (0); | |
539 | } | |
540 | ||
747e1639 MC |
541 | if (type == SSL3_RECORD_get_type(rr)) { |
542 | /* SSL3_RT_APPLICATION_DATA or | |
543 | * SSL3_RT_HANDSHAKE */ | |
0f113f3e MC |
544 | /* |
545 | * make sure that we are not getting application data when we are | |
546 | * doing a handshake for the first time | |
547 | */ | |
548 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
549 | (s->enc_read_ctx == NULL)) { | |
550 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
551 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE); | |
552 | goto f_err; | |
553 | } | |
7e159e01 | 554 | |
0f113f3e MC |
555 | if (len <= 0) |
556 | return (len); | |
557 | ||
747e1639 MC |
558 | if ((unsigned int)len > SSL3_RECORD_get_length(rr)) |
559 | n = SSL3_RECORD_get_length(rr); | |
0f113f3e MC |
560 | else |
561 | n = (unsigned int)len; | |
562 | ||
747e1639 | 563 | memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n); |
0f113f3e | 564 | if (!peek) { |
747e1639 MC |
565 | SSL3_RECORD_add_length(rr, -n); |
566 | SSL3_RECORD_add_off(rr, n); | |
567 | if (SSL3_RECORD_get_length(rr) == 0) { | |
295c3f41 | 568 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
747e1639 | 569 | SSL3_RECORD_set_off(rr, 0); |
0f113f3e MC |
570 | } |
571 | } | |
7e159e01 | 572 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
573 | /* |
574 | * We were about to renegotiate but had to read belated application | |
575 | * data first, so retry. | |
576 | */ | |
577 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
747e1639 | 578 | SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA && |
0f113f3e MC |
579 | (s->state == DTLS1_SCTP_ST_SR_READ_SOCK |
580 | || s->state == DTLS1_SCTP_ST_CR_READ_SOCK)) { | |
581 | s->rwstate = SSL_READING; | |
582 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
583 | BIO_set_retry_read(SSL_get_rbio(s)); | |
584 | } | |
585 | ||
586 | /* | |
587 | * We might had to delay a close_notify alert because of reordered | |
588 | * app data. If there was an alert and there is no message to read | |
589 | * anymore, finally set shutdown. | |
590 | */ | |
591 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
592 | s->d1->shutdown_received | |
593 | && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
594 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
595 | return (0); | |
596 | } | |
597 | #endif | |
598 | return (n); | |
599 | } | |
600 | ||
601 | /* | |
602 | * If we get here, then type != rr->type; if we have a handshake message, | |
603 | * then it was unexpected (Hello Request or Client Hello). | |
604 | */ | |
605 | ||
606 | /* | |
607 | * In case of record types for which we have 'fragment' storage, fill | |
608 | * that so that we can process the data at a fixed place. | |
609 | */ | |
610 | { | |
611 | unsigned int k, dest_maxlen = 0; | |
612 | unsigned char *dest = NULL; | |
613 | unsigned int *dest_len = NULL; | |
614 | ||
747e1639 | 615 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) { |
c661ac16 MC |
616 | dest_maxlen = sizeof s->rlayer.d->handshake_fragment; |
617 | dest = s->rlayer.d->handshake_fragment; | |
618 | dest_len = &s->rlayer.d->handshake_fragment_len; | |
747e1639 | 619 | } else if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) { |
c661ac16 MC |
620 | dest_maxlen = sizeof(s->rlayer.d->alert_fragment); |
621 | dest = s->rlayer.d->alert_fragment; | |
622 | dest_len = &s->rlayer.d->alert_fragment_len; | |
0f113f3e | 623 | } |
4817504d | 624 | #ifndef OPENSSL_NO_HEARTBEATS |
747e1639 | 625 | else if (SSL3_RECORD_get_type(rr) == TLS1_RT_HEARTBEAT) { |
69f68237 | 626 | /* We allow a 0 return */ |
61986d32 | 627 | if (dtls1_process_heartbeat(s, SSL3_RECORD_get_data(rr), |
747e1639 | 628 | SSL3_RECORD_get_length(rr)) < 0) { |
69f68237 MC |
629 | return -1; |
630 | } | |
0f113f3e | 631 | /* Exit and notify application to read again */ |
747e1639 | 632 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
633 | s->rwstate = SSL_READING; |
634 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
635 | BIO_set_retry_read(SSL_get_rbio(s)); | |
636 | return (-1); | |
637 | } | |
4817504d | 638 | #endif |
0f113f3e | 639 | /* else it's a CCS message, or application data or wrong */ |
747e1639 | 640 | else if (SSL3_RECORD_get_type(rr) != SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
641 | /* |
642 | * Application data while renegotiating is allowed. Try again | |
643 | * reading. | |
644 | */ | |
747e1639 | 645 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA) { |
0f113f3e MC |
646 | BIO *bio; |
647 | s->s3->in_read_app_data = 2; | |
648 | bio = SSL_get_rbio(s); | |
649 | s->rwstate = SSL_READING; | |
650 | BIO_clear_retry_flags(bio); | |
651 | BIO_set_retry_read(bio); | |
652 | return (-1); | |
653 | } | |
654 | ||
655 | /* Not certain if this is the right error handling */ | |
656 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
657 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
658 | goto f_err; | |
659 | } | |
660 | ||
661 | if (dest_maxlen > 0) { | |
662 | /* | |
663 | * XDTLS: In a pathalogical case, the Client Hello may be | |
664 | * fragmented--don't always expect dest_maxlen bytes | |
665 | */ | |
747e1639 | 666 | if (SSL3_RECORD_get_length(rr) < dest_maxlen) { |
d4938995 | 667 | #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE |
0f113f3e MC |
668 | /* |
669 | * for normal alerts rr->length is 2, while | |
670 | * dest_maxlen is 7 if we were to handle this | |
671 | * non-existing alert... | |
672 | */ | |
673 | FIX ME | |
d4938995 | 674 | #endif |
747e1639 MC |
675 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
676 | SSL3_RECORD_set_length(rr, 0); | |
0f113f3e MC |
677 | goto start; |
678 | } | |
679 | ||
680 | /* now move 'n' bytes: */ | |
681 | for (k = 0; k < dest_maxlen; k++) { | |
747e1639 MC |
682 | dest[k] = SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]; |
683 | SSL3_RECORD_add_off(rr, 1); | |
684 | SSL3_RECORD_add_length(rr, -1); | |
0f113f3e MC |
685 | } |
686 | *dest_len = dest_maxlen; | |
687 | } | |
688 | } | |
689 | ||
35a1cc90 | 690 | /*- |
c661ac16 MC |
691 | * s->rlayer.d->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE; |
692 | * s->rlayer.d->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT. | |
35a1cc90 MC |
693 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) |
694 | */ | |
0f113f3e MC |
695 | |
696 | /* If we are a client, check for an incoming 'Hello Request': */ | |
697 | if ((!s->server) && | |
c661ac16 MC |
698 | (s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
699 | (s->rlayer.d->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && | |
0f113f3e | 700 | (s->session != NULL) && (s->session->cipher != NULL)) { |
c661ac16 | 701 | s->rlayer.d->handshake_fragment_len = 0; |
0f113f3e | 702 | |
c661ac16 MC |
703 | if ((s->rlayer.d->handshake_fragment[1] != 0) || |
704 | (s->rlayer.d->handshake_fragment[2] != 0) || | |
705 | (s->rlayer.d->handshake_fragment[3] != 0)) { | |
0f113f3e MC |
706 | al = SSL_AD_DECODE_ERROR; |
707 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_HELLO_REQUEST); | |
4dc1aa04 | 708 | goto f_err; |
0f113f3e MC |
709 | } |
710 | ||
711 | /* | |
712 | * no need to check sequence number on HELLO REQUEST messages | |
713 | */ | |
714 | ||
715 | if (s->msg_callback) | |
716 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
c661ac16 | 717 | s->rlayer.d->handshake_fragment, 4, s, |
0f113f3e MC |
718 | s->msg_callback_arg); |
719 | ||
720 | if (SSL_is_init_finished(s) && | |
721 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && | |
722 | !s->s3->renegotiate) { | |
723 | s->d1->handshake_read_seq++; | |
724 | s->new_session = 1; | |
725 | ssl3_renegotiate(s); | |
726 | if (ssl3_renegotiate_check(s)) { | |
727 | i = s->handshake_func(s); | |
728 | if (i < 0) | |
729 | return (i); | |
730 | if (i == 0) { | |
731 | SSLerr(SSL_F_DTLS1_READ_BYTES, | |
732 | SSL_R_SSL_HANDSHAKE_FAILURE); | |
733 | return (-1); | |
734 | } | |
735 | ||
736 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 737 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 738 | /* no read-ahead left? */ |
0f113f3e MC |
739 | BIO *bio; |
740 | /* | |
741 | * In the case where we try to read application data, | |
742 | * but we trigger an SSL handshake, we return -1 with | |
743 | * the retry option set. Otherwise renegotiation may | |
744 | * cause nasty problems in the blocking world | |
745 | */ | |
746 | s->rwstate = SSL_READING; | |
747 | bio = SSL_get_rbio(s); | |
748 | BIO_clear_retry_flags(bio); | |
749 | BIO_set_retry_read(bio); | |
750 | return (-1); | |
751 | } | |
752 | } | |
753 | } | |
754 | } | |
755 | /* | |
756 | * we either finished a handshake or ignored the request, now try | |
757 | * again to obtain the (application) data we were asked for | |
758 | */ | |
759 | goto start; | |
760 | } | |
761 | ||
c661ac16 MC |
762 | if (s->rlayer.d->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) { |
763 | int alert_level = s->rlayer.d->alert_fragment[0]; | |
764 | int alert_descr = s->rlayer.d->alert_fragment[1]; | |
0f113f3e | 765 | |
c661ac16 | 766 | s->rlayer.d->alert_fragment_len = 0; |
0f113f3e MC |
767 | |
768 | if (s->msg_callback) | |
769 | s->msg_callback(0, s->version, SSL3_RT_ALERT, | |
c661ac16 MC |
770 | s->rlayer.d->alert_fragment, 2, s, |
771 | s->msg_callback_arg); | |
0f113f3e MC |
772 | |
773 | if (s->info_callback != NULL) | |
774 | cb = s->info_callback; | |
775 | else if (s->ctx->info_callback != NULL) | |
776 | cb = s->ctx->info_callback; | |
777 | ||
778 | if (cb != NULL) { | |
779 | j = (alert_level << 8) | alert_descr; | |
780 | cb(s, SSL_CB_READ_ALERT, j); | |
781 | } | |
782 | ||
fd865cad | 783 | if (alert_level == SSL3_AL_WARNING) { |
0f113f3e MC |
784 | s->s3->warn_alert = alert_descr; |
785 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) { | |
7e159e01 | 786 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
787 | /* |
788 | * With SCTP and streams the socket may deliver app data | |
789 | * after a close_notify alert. We have to check this first so | |
790 | * that nothing gets discarded. | |
791 | */ | |
792 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
793 | BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
794 | s->d1->shutdown_received = 1; | |
795 | s->rwstate = SSL_READING; | |
796 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
797 | BIO_set_retry_read(SSL_get_rbio(s)); | |
798 | return -1; | |
799 | } | |
7e159e01 | 800 | #endif |
0f113f3e MC |
801 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; |
802 | return (0); | |
803 | } | |
36d16f8e BL |
804 | #if 0 |
805 | /* XXX: this is a possible improvement in the future */ | |
0f113f3e MC |
806 | /* now check if it's a missing record */ |
807 | if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) { | |
808 | unsigned short seq; | |
809 | unsigned int frag_off; | |
c661ac16 | 810 | unsigned char *p = &(s->rlayer.d->alert_fragment[2]); |
0f113f3e MC |
811 | |
812 | n2s(p, seq); | |
813 | n2l3(p, frag_off); | |
814 | ||
815 | dtls1_retransmit_message(s, | |
816 | dtls1_get_queue_priority | |
817 | (frag->msg_header.seq, 0), frag_off, | |
818 | &found); | |
819 | if (!found && SSL_in_init(s)) { | |
820 | /* | |
821 | * fprintf( stderr,"in init = %d\n", SSL_in_init(s)); | |
822 | */ | |
823 | /* | |
824 | * requested a message not yet sent, send an alert | |
825 | * ourselves | |
826 | */ | |
827 | ssl3_send_alert(s, SSL3_AL_WARNING, | |
828 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); | |
829 | } | |
830 | } | |
36d16f8e | 831 | #endif |
fd865cad | 832 | } else if (alert_level == SSL3_AL_FATAL) { |
0f113f3e MC |
833 | char tmp[16]; |
834 | ||
835 | s->rwstate = SSL_NOTHING; | |
836 | s->s3->fatal_alert = alert_descr; | |
837 | SSLerr(SSL_F_DTLS1_READ_BYTES, | |
838 | SSL_AD_REASON_OFFSET + alert_descr); | |
839 | BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr); | |
840 | ERR_add_error_data(2, "SSL alert number ", tmp); | |
841 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
842 | SSL_CTX_remove_session(s->ctx, s->session); | |
843 | return (0); | |
844 | } else { | |
845 | al = SSL_AD_ILLEGAL_PARAMETER; | |
846 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE); | |
847 | goto f_err; | |
848 | } | |
849 | ||
850 | goto start; | |
851 | } | |
852 | ||
853 | if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a | |
854 | * shutdown */ | |
855 | s->rwstate = SSL_NOTHING; | |
747e1639 | 856 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
857 | return (0); |
858 | } | |
859 | ||
747e1639 | 860 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
861 | unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH; |
862 | ||
0f113f3e MC |
863 | if (s->version == DTLS1_BAD_VER) |
864 | ccs_hdr_len = 3; | |
865 | ||
866 | /* | |
867 | * 'Change Cipher Spec' is just a single byte, so we know exactly | |
868 | * what the record payload has to look like | |
869 | */ | |
870 | /* XDTLS: check that epoch is consistent */ | |
747e1639 MC |
871 | if ((SSL3_RECORD_get_length(rr) != ccs_hdr_len) |
872 | || (SSL3_RECORD_get_off(rr) != 0) | |
873 | || (SSL3_RECORD_get_data(rr)[0] != SSL3_MT_CCS)) { | |
0f113f3e MC |
874 | i = SSL_AD_ILLEGAL_PARAMETER; |
875 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
876 | goto err; | |
877 | } | |
878 | ||
747e1639 | 879 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
880 | |
881 | if (s->msg_callback) | |
882 | s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, | |
747e1639 | 883 | SSL3_RECORD_get_data(rr), 1, s, s->msg_callback_arg); |
0f113f3e MC |
884 | |
885 | /* | |
886 | * We can't process a CCS now, because previous handshake messages | |
887 | * are still missing, so just drop it. | |
888 | */ | |
889 | if (!s->d1->change_cipher_spec_ok) { | |
890 | goto start; | |
891 | } | |
892 | ||
893 | s->d1->change_cipher_spec_ok = 0; | |
894 | ||
895 | s->s3->change_cipher_spec = 1; | |
896 | if (!ssl3_do_change_cipher_spec(s)) | |
897 | goto err; | |
898 | ||
899 | /* do this whenever CCS is processed */ | |
900 | dtls1_reset_seq_numbers(s, SSL3_CC_READ); | |
901 | ||
902 | if (s->version == DTLS1_BAD_VER) | |
903 | s->d1->handshake_read_seq++; | |
8711efb4 | 904 | |
7e159e01 | 905 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
906 | /* |
907 | * Remember that a CCS has been received, so that an old key of | |
908 | * SCTP-Auth can be deleted when a CCS is sent. Will be ignored if no | |
909 | * SCTP is used | |
910 | */ | |
911 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL); | |
7e159e01 DSH |
912 | #endif |
913 | ||
0f113f3e MC |
914 | goto start; |
915 | } | |
916 | ||
917 | /* | |
918 | * Unexpected handshake message (Client Hello, or protocol violation) | |
919 | */ | |
c661ac16 | 920 | if ((s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
0f113f3e MC |
921 | !s->in_handshake) { |
922 | struct hm_header_st msg_hdr; | |
923 | ||
924 | /* this may just be a stale retransmit */ | |
925 | dtls1_get_message_header(rr->data, &msg_hdr); | |
747e1639 MC |
926 | if (SSL3_RECORD_get_epoch(rr) != s->rlayer.d->r_epoch) { |
927 | SSL3_RECORD_set_length(rr, 0); | |
0f113f3e MC |
928 | goto start; |
929 | } | |
930 | ||
931 | /* | |
932 | * If we are server, we may have a repeated FINISHED of the client | |
933 | * here, then retransmit our CCS and FINISHED. | |
934 | */ | |
935 | if (msg_hdr.type == SSL3_MT_FINISHED) { | |
936 | if (dtls1_check_timeout_num(s) < 0) | |
937 | return -1; | |
938 | ||
17dd65e6 | 939 | dtls1_retransmit_buffered_messages(s); |
747e1639 | 940 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
941 | goto start; |
942 | } | |
943 | ||
944 | if (((s->state & SSL_ST_MASK) == SSL_ST_OK) && | |
945 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) { | |
0f113f3e | 946 | s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; |
0f113f3e MC |
947 | s->renegotiate = 1; |
948 | s->new_session = 1; | |
949 | } | |
950 | i = s->handshake_func(s); | |
951 | if (i < 0) | |
952 | return (i); | |
953 | if (i == 0) { | |
954 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
955 | return (-1); | |
956 | } | |
957 | ||
958 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 959 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 960 | /* no read-ahead left? */ |
0f113f3e MC |
961 | BIO *bio; |
962 | /* | |
963 | * In the case where we try to read application data, but we | |
964 | * trigger an SSL handshake, we return -1 with the retry | |
965 | * option set. Otherwise renegotiation may cause nasty | |
966 | * problems in the blocking world | |
967 | */ | |
968 | s->rwstate = SSL_READING; | |
969 | bio = SSL_get_rbio(s); | |
970 | BIO_clear_retry_flags(bio); | |
971 | BIO_set_retry_read(bio); | |
972 | return (-1); | |
973 | } | |
974 | } | |
975 | goto start; | |
976 | } | |
977 | ||
747e1639 | 978 | switch (SSL3_RECORD_get_type(rr)) { |
0f113f3e | 979 | default: |
0f113f3e MC |
980 | /* TLS just ignores unknown message types */ |
981 | if (s->version == TLS1_VERSION) { | |
747e1639 | 982 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
983 | goto start; |
984 | } | |
0f113f3e MC |
985 | al = SSL_AD_UNEXPECTED_MESSAGE; |
986 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
987 | goto f_err; | |
988 | case SSL3_RT_CHANGE_CIPHER_SPEC: | |
989 | case SSL3_RT_ALERT: | |
990 | case SSL3_RT_HANDSHAKE: | |
991 | /* | |
992 | * we already handled all of these, with the possible exception of | |
993 | * SSL3_RT_HANDSHAKE when s->in_handshake is set, but that should not | |
994 | * happen when type != rr->type | |
995 | */ | |
996 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
997 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
998 | goto f_err; | |
999 | case SSL3_RT_APPLICATION_DATA: | |
1000 | /* | |
1001 | * At this point, we were expecting handshake data, but have | |
1002 | * application data. If the library was running inside ssl3_read() | |
1003 | * (i.e. in_read_app_data is set) and it makes sense to read | |
1004 | * application data at this point (session renegotiation not yet | |
1005 | * started), we will indulge it. | |
1006 | */ | |
1007 | if (s->s3->in_read_app_data && | |
1008 | (s->s3->total_renegotiations != 0) && | |
1009 | (((s->state & SSL_ST_CONNECT) && | |
1010 | (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && | |
1011 | (s->state <= SSL3_ST_CR_SRVR_HELLO_A) | |
1012 | ) || ((s->state & SSL_ST_ACCEPT) && | |
1013 | (s->state <= SSL3_ST_SW_HELLO_REQ_A) && | |
1014 | (s->state >= SSL3_ST_SR_CLNT_HELLO_A) | |
1015 | ) | |
1016 | )) { | |
1017 | s->s3->in_read_app_data = 2; | |
1018 | return (-1); | |
1019 | } else { | |
1020 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
1021 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
1022 | goto f_err; | |
1023 | } | |
1024 | } | |
1025 | /* not reached */ | |
1026 | ||
1027 | f_err: | |
1028 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1029 | err: | |
1030 | return (-1); | |
1031 | } | |
1032 | ||
0f113f3e MC |
1033 | |
1034 | /* | |
1035 | * this only happens when a client hello is received and a handshake | |
1036 | * is started. | |
1037 | */ | |
6f7ae319 MC |
1038 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
1039 | int len, int peek) | |
0f113f3e MC |
1040 | { |
1041 | ||
c661ac16 MC |
1042 | if ((type == SSL3_RT_HANDSHAKE) |
1043 | && (s->rlayer.d->handshake_fragment_len > 0)) | |
0f113f3e MC |
1044 | /* (partially) satisfy request from storage */ |
1045 | { | |
c661ac16 | 1046 | unsigned char *src = s->rlayer.d->handshake_fragment; |
0f113f3e MC |
1047 | unsigned char *dst = buf; |
1048 | unsigned int k, n; | |
1049 | ||
1050 | /* peek == 0 */ | |
1051 | n = 0; | |
c661ac16 | 1052 | while ((len > 0) && (s->rlayer.d->handshake_fragment_len > 0)) { |
0f113f3e MC |
1053 | *dst++ = *src++; |
1054 | len--; | |
c661ac16 | 1055 | s->rlayer.d->handshake_fragment_len--; |
0f113f3e MC |
1056 | n++; |
1057 | } | |
1058 | /* move any remaining fragment bytes: */ | |
c661ac16 MC |
1059 | for (k = 0; k < s->rlayer.d->handshake_fragment_len; k++) |
1060 | s->rlayer.d->handshake_fragment[k] = *src++; | |
0f113f3e MC |
1061 | return n; |
1062 | } | |
1063 | ||
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * Call this to write data in records of type 'type' It will return <= 0 if | |
1069 | * not all data has been sent or non-blocking IO. | |
36d16f8e | 1070 | */ |
480b9e5d | 1071 | int dtls1_write_bytes(SSL *s, int type, const void *buf, int len) |
0f113f3e MC |
1072 | { |
1073 | int i; | |
1074 | ||
1075 | OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH); | |
1076 | s->rwstate = SSL_NOTHING; | |
1077 | i = do_dtls1_write(s, type, buf, len, 0); | |
1078 | return i; | |
1079 | } | |
1080 | ||
1081 | int do_dtls1_write(SSL *s, int type, const unsigned char *buf, | |
1082 | unsigned int len, int create_empty_fragment) | |
1083 | { | |
1084 | unsigned char *p, *pseq; | |
1085 | int i, mac_size, clear = 0; | |
1086 | int prefix_len = 0; | |
1087 | int eivlen; | |
1088 | SSL3_RECORD *wr; | |
1089 | SSL3_BUFFER *wb; | |
1090 | SSL_SESSION *sess; | |
1091 | ||
88c23039 | 1092 | wb = &s->rlayer.wbuf; |
db9a32e7 | 1093 | |
0f113f3e MC |
1094 | /* |
1095 | * first check if there is a SSL3_BUFFER still being written out. This | |
1096 | * will happen with non blocking IO | |
1097 | */ | |
db9a32e7 | 1098 | if (SSL3_BUFFER_get_left(wb) != 0) { |
0f113f3e MC |
1099 | OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */ |
1100 | return (ssl3_write_pending(s, type, buf, len)); | |
1101 | } | |
1102 | ||
1103 | /* If we have an alert to send, lets send it */ | |
1104 | if (s->s3->alert_dispatch) { | |
1105 | i = s->method->ssl_dispatch_alert(s); | |
1106 | if (i <= 0) | |
1107 | return (i); | |
1108 | /* if it went, fall through and send more stuff */ | |
1109 | } | |
1110 | ||
1111 | if (len == 0 && !create_empty_fragment) | |
1112 | return 0; | |
1113 | ||
88c23039 | 1114 | wr = &s->rlayer.wrec; |
0f113f3e MC |
1115 | sess = s->session; |
1116 | ||
1117 | if ((sess == NULL) || | |
1118 | (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL)) | |
1119 | clear = 1; | |
1120 | ||
1121 | if (clear) | |
1122 | mac_size = 0; | |
1123 | else { | |
1124 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
1125 | if (mac_size < 0) | |
1126 | goto err; | |
1127 | } | |
1128 | ||
747e1639 | 1129 | p = SSL3_BUFFER_get_buf(wb) + prefix_len; |
0f113f3e MC |
1130 | |
1131 | /* write the header */ | |
1132 | ||
1133 | *(p++) = type & 0xff; | |
747e1639 | 1134 | SSL3_RECORD_set_type(wr, type); |
0f113f3e MC |
1135 | /* |
1136 | * Special case: for hello verify request, client version 1.0 and we | |
1137 | * haven't decided which version to use yet send back using version 1.0 | |
1138 | * header: otherwise some clients will ignore it. | |
1139 | */ | |
1140 | if (s->method->version == DTLS_ANY_VERSION) { | |
1141 | *(p++) = DTLS1_VERSION >> 8; | |
1142 | *(p++) = DTLS1_VERSION & 0xff; | |
1143 | } else { | |
1144 | *(p++) = s->version >> 8; | |
1145 | *(p++) = s->version & 0xff; | |
1146 | } | |
1147 | ||
1148 | /* field where we are to write out packet epoch, seq num and len */ | |
1149 | pseq = p; | |
1150 | p += 10; | |
1151 | ||
1152 | /* Explicit IV length, block ciphers appropriate version flag */ | |
1153 | if (s->enc_write_ctx) { | |
1154 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx); | |
1155 | if (mode == EVP_CIPH_CBC_MODE) { | |
1156 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx); | |
1157 | if (eivlen <= 1) | |
1158 | eivlen = 0; | |
1159 | } | |
1160 | /* Need explicit part of IV for GCM mode */ | |
1161 | else if (mode == EVP_CIPH_GCM_MODE) | |
1162 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
1163 | else | |
1164 | eivlen = 0; | |
1165 | } else | |
1166 | eivlen = 0; | |
1167 | ||
1168 | /* lets setup the record stuff. */ | |
747e1639 MC |
1169 | SSL3_RECORD_set_data(wr, p + eivlen); /* make room for IV in case of CBC */ |
1170 | SSL3_RECORD_set_length(wr, (int)len); | |
1171 | SSL3_RECORD_set_input(wr, (unsigned char *)buf); | |
0f113f3e MC |
1172 | |
1173 | /* | |
1174 | * we now 'read' from wr->input, wr->length bytes into wr->data | |
1175 | */ | |
1176 | ||
1177 | /* first we compress */ | |
1178 | if (s->compress != NULL) { | |
1179 | if (!ssl3_do_compress(s)) { | |
1180 | SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_COMPRESSION_FAILURE); | |
1181 | goto err; | |
1182 | } | |
1183 | } else { | |
747e1639 MC |
1184 | memcpy(SSL3_RECORD_get_data(wr), SSL3_RECORD_get_input(wr), |
1185 | SSL3_RECORD_get_length(wr)); | |
1186 | SSL3_RECORD_reset_input(wr); | |
0f113f3e | 1187 | } |
36d16f8e | 1188 | |
0f113f3e MC |
1189 | /* |
1190 | * we should still have the output to wr->data and the input from | |
1191 | * wr->input. Length should be wr->length. wr->data still points in the | |
1192 | * wb->buf | |
1193 | */ | |
36d16f8e | 1194 | |
0f113f3e | 1195 | if (mac_size != 0) { |
747e1639 MC |
1196 | if (s->method->ssl3_enc->mac(s, |
1197 | &(p[SSL3_RECORD_get_length(wr) + eivlen]), 1) < 0) | |
0f113f3e | 1198 | goto err; |
747e1639 | 1199 | SSL3_RECORD_add_length(wr, mac_size); |
0f113f3e | 1200 | } |
36d16f8e | 1201 | |
0f113f3e | 1202 | /* this is true regardless of mac size */ |
747e1639 MC |
1203 | SSL3_RECORD_set_data(wr, p); |
1204 | SSL3_RECORD_reset_input(wr); | |
36d16f8e | 1205 | |
0f113f3e | 1206 | if (eivlen) |
747e1639 | 1207 | SSL3_RECORD_add_length(wr, eivlen); |
36d16f8e | 1208 | |
0f113f3e MC |
1209 | if (s->method->ssl3_enc->enc(s, 1) < 1) |
1210 | goto err; | |
36d16f8e | 1211 | |
0f113f3e MC |
1212 | /* record length after mac and block padding */ |
1213 | /* | |
1214 | * if (type == SSL3_RT_APPLICATION_DATA || (type == SSL3_RT_ALERT && ! | |
1215 | * SSL_in_init(s))) | |
1216 | */ | |
36d16f8e | 1217 | |
0f113f3e | 1218 | /* there's only one epoch between handshake and app data */ |
36d16f8e | 1219 | |
78a39fe7 | 1220 | s2n(s->rlayer.d->w_epoch, pseq); |
36d16f8e | 1221 | |
0f113f3e MC |
1222 | /* XDTLS: ?? */ |
1223 | /* | |
1224 | * else s2n(s->d1->handshake_epoch, pseq); | |
1225 | */ | |
36d16f8e | 1226 | |
de07f311 | 1227 | memcpy(pseq, &(s->rlayer.write_sequence[2]), 6); |
0f113f3e | 1228 | pseq += 6; |
747e1639 | 1229 | s2n(SSL3_RECORD_get_length(wr), pseq); |
36d16f8e | 1230 | |
0f113f3e MC |
1231 | if (s->msg_callback) |
1232 | s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH, | |
1233 | DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg); | |
36d16f8e | 1234 | |
0f113f3e MC |
1235 | /* |
1236 | * we should now have wr->data pointing to the encrypted data, which is | |
1237 | * wr->length long | |
1238 | */ | |
747e1639 MC |
1239 | SSL3_RECORD_set_type(wr, type); /* not needed but helps for debugging */ |
1240 | SSL3_RECORD_add_length(wr, DTLS1_RT_HEADER_LENGTH); | |
36d16f8e | 1241 | |
de07f311 | 1242 | ssl3_record_sequence_update(&(s->rlayer.write_sequence[0])); |
36d16f8e | 1243 | |
0f113f3e MC |
1244 | if (create_empty_fragment) { |
1245 | /* | |
1246 | * we are in a recursive call; just return the length, don't write | |
1247 | * out anything here | |
1248 | */ | |
1249 | return wr->length; | |
1250 | } | |
36d16f8e | 1251 | |
0f113f3e | 1252 | /* now let's set up wb */ |
747e1639 MC |
1253 | SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(wr)); |
1254 | SSL3_BUFFER_set_offset(wb, 0); | |
0f113f3e MC |
1255 | |
1256 | /* | |
1257 | * memorize arguments so that ssl3_write_pending can detect bad write | |
1258 | * retries later | |
1259 | */ | |
f8caa3c8 MC |
1260 | s->rlayer.wpend_tot = len; |
1261 | s->rlayer.wpend_buf = buf; | |
1262 | s->rlayer.wpend_type = type; | |
1263 | s->rlayer.wpend_ret = len; | |
0f113f3e MC |
1264 | |
1265 | /* we now just need to write the buffer */ | |
1266 | return ssl3_write_pending(s, type, buf, len); | |
1267 | err: | |
1268 | return -1; | |
1269 | } | |
36d16f8e | 1270 | |
fe589e61 | 1271 | DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, |
0f113f3e MC |
1272 | unsigned int *is_next_epoch) |
1273 | { | |
1274 | ||
36d16f8e BL |
1275 | *is_next_epoch = 0; |
1276 | ||
1277 | /* In current epoch, accept HM, CCS, DATA, & ALERT */ | |
78a39fe7 | 1278 | if (rr->epoch == s->rlayer.d->r_epoch) |
91f93f69 | 1279 | return &s->rlayer.d->bitmap; |
36d16f8e BL |
1280 | |
1281 | /* Only HM and ALERT messages can be from the next epoch */ | |
78a39fe7 MC |
1282 | else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) && |
1283 | (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) { | |
36d16f8e | 1284 | *is_next_epoch = 1; |
91f93f69 | 1285 | return &s->rlayer.d->next_bitmap; |
0f113f3e | 1286 | } |
36d16f8e BL |
1287 | |
1288 | return NULL; | |
0f113f3e | 1289 | } |
36d16f8e | 1290 | |
0f113f3e MC |
1291 | void dtls1_reset_seq_numbers(SSL *s, int rw) |
1292 | { | |
1293 | unsigned char *seq; | |
de07f311 | 1294 | unsigned int seq_bytes = sizeof(s->rlayer.read_sequence); |
0f113f3e MC |
1295 | |
1296 | if (rw & SSL3_CC_READ) { | |
de07f311 | 1297 | seq = s->rlayer.read_sequence; |
78a39fe7 | 1298 | s->rlayer.d->r_epoch++; |
16f8d4eb RS |
1299 | memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap, |
1300 | sizeof(s->rlayer.d->bitmap)); | |
1301 | memset(&s->rlayer.d->next_bitmap, 0, | |
1302 | sizeof(s->rlayer.d->next_bitmap)); | |
0f113f3e | 1303 | } else { |
de07f311 | 1304 | seq = s->rlayer.write_sequence; |
3bb8f87d | 1305 | memcpy(s->rlayer.d->last_write_sequence, seq, |
de07f311 | 1306 | sizeof(s->rlayer.write_sequence)); |
78a39fe7 | 1307 | s->rlayer.d->w_epoch++; |
0f113f3e MC |
1308 | } |
1309 | ||
16f8d4eb | 1310 | memset(seq, 0, seq_bytes); |
0f113f3e | 1311 | } |