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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 | |
a71edf3b MC |
140 | if (d->unprocessed_rcds.q == NULL || d->processed_rcds.q == NULL |
141 | || d->buffered_app_data.q == NULL) { | |
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 | ||
e3d0dae7 MC |
229 | |
230 | void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq) | |
231 | { | |
232 | memcpy(rl->write_sequence, seq, SEQ_NUM_SIZE); | |
233 | } | |
234 | ||
0f113f3e MC |
235 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
236 | int len, int peek); | |
36d16f8e | 237 | |
36d16f8e | 238 | /* copy buffered record into SSL structure */ |
0f113f3e MC |
239 | static int dtls1_copy_record(SSL *s, pitem *item) |
240 | { | |
36d16f8e BL |
241 | DTLS1_RECORD_DATA *rdata; |
242 | ||
243 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
0f113f3e | 244 | |
88c23039 | 245 | SSL3_BUFFER_release(&s->rlayer.rbuf); |
0f113f3e | 246 | |
7a7048af MC |
247 | s->rlayer.packet = rdata->packet; |
248 | s->rlayer.packet_length = rdata->packet_length; | |
88c23039 MC |
249 | memcpy(&s->rlayer.rbuf, &(rdata->rbuf), sizeof(SSL3_BUFFER)); |
250 | memcpy(&s->rlayer.rrec, &(rdata->rrec), sizeof(SSL3_RECORD)); | |
36d16f8e | 251 | |
0f113f3e | 252 | /* Set proper sequence number for mac calculation */ |
de07f311 | 253 | memcpy(&(s->rlayer.read_sequence[2]), &(rdata->packet[5]), 6); |
0f113f3e MC |
254 | |
255 | return (1); | |
256 | } | |
36d16f8e | 257 | |
6f7ae319 | 258 | int 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 | ||
b4faea50 | 267 | rdata = OPENSSL_malloc(sizeof(*rdata)); |
0f113f3e MC |
268 | item = pitem_new(priority, rdata); |
269 | if (rdata == NULL || item == NULL) { | |
b548a1f1 | 270 | OPENSSL_free(rdata); |
25aaa98a | 271 | pitem_free(item); |
0f113f3e | 272 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); |
06c6a2b4 | 273 | return -1; |
0f113f3e MC |
274 | } |
275 | ||
7a7048af MC |
276 | rdata->packet = s->rlayer.packet; |
277 | rdata->packet_length = s->rlayer.packet_length; | |
88c23039 MC |
278 | memcpy(&(rdata->rbuf), &s->rlayer.rbuf, sizeof(SSL3_BUFFER)); |
279 | memcpy(&(rdata->rrec), &s->rlayer.rrec, sizeof(SSL3_RECORD)); | |
0f113f3e MC |
280 | |
281 | item->data = rdata; | |
36d16f8e | 282 | |
7e159e01 | 283 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
284 | /* Store bio_dgram_sctp_rcvinfo struct */ |
285 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
5998e290 MC |
286 | (SSL_get_state(s) == TLS_ST_SR_FINISHED |
287 | || SSL_get_state(s) == TLS_ST_CR_FINISHED)) { | |
0f113f3e MC |
288 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO, |
289 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
290 | } | |
7e159e01 DSH |
291 | #endif |
292 | ||
7a7048af MC |
293 | s->rlayer.packet = NULL; |
294 | s->rlayer.packet_length = 0; | |
16f8d4eb RS |
295 | memset(&s->rlayer.rbuf, 0, sizeof(s->rlayer.rbuf)); |
296 | memset(&s->rlayer.rrec, 0, sizeof(s->rlayer.rrec)); | |
0f113f3e MC |
297 | |
298 | if (!ssl3_setup_buffers(s)) { | |
299 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); | |
b548a1f1 | 300 | OPENSSL_free(rdata->rbuf.buf); |
0f113f3e MC |
301 | OPENSSL_free(rdata); |
302 | pitem_free(item); | |
303 | return (-1); | |
304 | } | |
36d16f8e | 305 | |
0f113f3e MC |
306 | /* insert should not fail, since duplicates are dropped */ |
307 | if (pqueue_insert(queue->q, item) == NULL) { | |
308 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); | |
b548a1f1 | 309 | OPENSSL_free(rdata->rbuf.buf); |
0f113f3e MC |
310 | OPENSSL_free(rdata); |
311 | pitem_free(item); | |
312 | return (-1); | |
313 | } | |
36d16f8e | 314 | |
0f113f3e MC |
315 | return (1); |
316 | } | |
317 | ||
fe589e61 | 318 | int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue) |
0f113f3e | 319 | { |
36d16f8e BL |
320 | pitem *item; |
321 | ||
322 | item = pqueue_pop(queue->q); | |
0f113f3e | 323 | if (item) { |
36d16f8e BL |
324 | dtls1_copy_record(s, item); |
325 | ||
326 | OPENSSL_free(item->data); | |
0f113f3e | 327 | pitem_free(item); |
36d16f8e | 328 | |
0f113f3e | 329 | return (1); |
36d16f8e BL |
330 | } |
331 | ||
0f113f3e MC |
332 | return (0); |
333 | } | |
36d16f8e | 334 | |
0f113f3e MC |
335 | /* |
336 | * retrieve a buffered record that belongs to the new epoch, i.e., not | |
337 | * processed yet | |
338 | */ | |
36d16f8e BL |
339 | #define dtls1_get_unprocessed_record(s) \ |
340 | dtls1_retrieve_buffered_record((s), \ | |
cb2ce7ab | 341 | &((s)->rlayer.d->unprocessed_rcds)) |
36d16f8e | 342 | |
36d16f8e | 343 | |
fe589e61 | 344 | int dtls1_process_buffered_records(SSL *s) |
0f113f3e | 345 | { |
36d16f8e | 346 | pitem *item; |
0f113f3e | 347 | |
cb2ce7ab | 348 | item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q); |
0f113f3e | 349 | if (item) { |
36d16f8e | 350 | /* Check if epoch is current. */ |
cb2ce7ab | 351 | if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch) |
0f113f3e MC |
352 | return (1); /* Nothing to do. */ |
353 | ||
36d16f8e | 354 | /* Process all the records. */ |
cb2ce7ab | 355 | while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) { |
36d16f8e | 356 | dtls1_get_unprocessed_record(s); |
0f113f3e MC |
357 | if (!dtls1_process_record(s)) |
358 | return (0); | |
cb2ce7ab | 359 | if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds), |
88c23039 | 360 | SSL3_RECORD_get_seq_num(&s->rlayer.rrec)) < 0) |
103b171d | 361 | return -1; |
36d16f8e | 362 | } |
0f113f3e | 363 | } |
36d16f8e | 364 | |
0f113f3e MC |
365 | /* |
366 | * sync epoch numbers once all the unprocessed records have been | |
367 | * processed | |
368 | */ | |
cb2ce7ab MC |
369 | s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch; |
370 | s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1; | |
36d16f8e | 371 | |
0f113f3e MC |
372 | return (1); |
373 | } | |
36d16f8e | 374 | |
36d16f8e | 375 | |
1d97c843 TH |
376 | /*- |
377 | * Return up to 'len' payload bytes received in 'type' records. | |
36d16f8e BL |
378 | * 'type' is one of the following: |
379 | * | |
380 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
381 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
382 | * - 0 (during a shutdown, no data has to be returned) | |
383 | * | |
384 | * If we don't have stored data to work from, read a SSL/TLS record first | |
385 | * (possibly multiple records if we still don't have anything to return). | |
386 | * | |
387 | * This function must handle any surprises the peer may have for us, such as | |
c69f2adf MC |
388 | * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec |
389 | * messages are treated as if they were handshake messages *if* the |recd_type| | |
390 | * argument is non NULL. | |
36d16f8e BL |
391 | * Also if record payloads contain fragments too small to process, we store |
392 | * them until there is enough for the respective protocol (the record protocol | |
393 | * may use arbitrary fragmentation and even interleaving): | |
394 | * Change cipher spec protocol | |
395 | * just 1 byte needed, no need for keeping anything stored | |
396 | * Alert protocol | |
397 | * 2 bytes needed (AlertLevel, AlertDescription) | |
398 | * Handshake protocol | |
399 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
400 | * to detect unexpected Client Hello and Hello Request messages | |
401 | * here, anything else is handled by higher layers | |
402 | * Application data protocol | |
403 | * none of our business | |
404 | */ | |
657da85e MC |
405 | int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf, |
406 | int len, int peek) | |
0f113f3e MC |
407 | { |
408 | int al, i, j, ret; | |
409 | unsigned int n; | |
410 | SSL3_RECORD *rr; | |
411 | void (*cb) (const SSL *ssl, int type2, int val) = NULL; | |
412 | ||
88c23039 | 413 | if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) { |
28d59af8 | 414 | /* Not initialized yet */ |
0f113f3e MC |
415 | if (!ssl3_setup_buffers(s)) |
416 | return (-1); | |
28d59af8 | 417 | } |
0f113f3e MC |
418 | |
419 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && | |
420 | (type != SSL3_RT_HANDSHAKE)) || | |
421 | (peek && (type != SSL3_RT_APPLICATION_DATA))) { | |
422 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
423 | return -1; | |
424 | } | |
425 | ||
426 | /* | |
427 | * check whether there's a handshake message (client hello?) waiting | |
428 | */ | |
429 | if ((ret = have_handshake_fragment(s, type, buf, len, peek))) | |
430 | return ret; | |
431 | ||
432 | /* | |
c661ac16 MC |
433 | * Now s->rlayer.d->handshake_fragment_len == 0 if |
434 | * type == SSL3_RT_HANDSHAKE. | |
0f113f3e | 435 | */ |
36d16f8e | 436 | |
7e159e01 | 437 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
438 | /* |
439 | * Continue handshake if it had to be interrupted to read app data with | |
440 | * SCTP. | |
441 | */ | |
024f543c | 442 | if ((!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) || |
8723588e | 443 | (BIO_dgram_is_sctp(SSL_get_rbio(s)) |
fe3a3291 | 444 | && ossl_statem_in_sctp_read_sock(s) |
0f113f3e | 445 | && s->s3->in_read_app_data != 2)) |
7e159e01 | 446 | #else |
024f543c | 447 | if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) |
7e159e01 | 448 | #endif |
0f113f3e MC |
449 | { |
450 | /* type == SSL3_RT_APPLICATION_DATA */ | |
451 | i = s->handshake_func(s); | |
452 | if (i < 0) | |
453 | return (i); | |
454 | if (i == 0) { | |
455 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
456 | return (-1); | |
457 | } | |
458 | } | |
459 | ||
460 | start: | |
461 | s->rwstate = SSL_NOTHING; | |
462 | ||
50e735f9 MC |
463 | /*- |
464 | * s->s3->rrec.type - is the type of record | |
465 | * s->s3->rrec.data, - data | |
466 | * s->s3->rrec.off, - offset into 'data' for next read | |
467 | * s->s3->rrec.length, - number of bytes. | |
468 | */ | |
88c23039 | 469 | rr = &s->rlayer.rrec; |
0f113f3e MC |
470 | |
471 | /* | |
472 | * We are not handshaking and have no data yet, so process data buffered | |
473 | * during the last handshake in advance, if any. | |
474 | */ | |
49ae7423 | 475 | if (SSL_is_init_finished(s) && SSL3_RECORD_get_length(rr) == 0) { |
0f113f3e | 476 | pitem *item; |
24a1e2f2 | 477 | item = pqueue_pop(s->rlayer.d->buffered_app_data.q); |
0f113f3e | 478 | if (item) { |
7e159e01 | 479 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
480 | /* Restore bio_dgram_sctp_rcvinfo struct */ |
481 | if (BIO_dgram_is_sctp(SSL_get_rbio(s))) { | |
482 | DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data; | |
483 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO, | |
484 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
485 | } | |
7e159e01 DSH |
486 | #endif |
487 | ||
0f113f3e MC |
488 | dtls1_copy_record(s, item); |
489 | ||
490 | OPENSSL_free(item->data); | |
491 | pitem_free(item); | |
492 | } | |
493 | } | |
494 | ||
495 | /* Check for timeout */ | |
496 | if (dtls1_handle_timeout(s) > 0) | |
497 | goto start; | |
498 | ||
499 | /* get new packet if necessary */ | |
747e1639 MC |
500 | if ((SSL3_RECORD_get_length(rr) == 0) |
501 | || (s->rlayer.rstate == SSL_ST_READ_BODY)) { | |
0f113f3e MC |
502 | ret = dtls1_get_record(s); |
503 | if (ret <= 0) { | |
504 | ret = dtls1_read_failed(s, ret); | |
505 | /* anything other than a timeout is an error */ | |
506 | if (ret <= 0) | |
507 | return (ret); | |
508 | else | |
509 | goto start; | |
510 | } | |
511 | } | |
512 | ||
0f113f3e MC |
513 | /* we now have a packet which can be read and processed */ |
514 | ||
515 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, | |
516 | * reset by ssl3_get_finished */ | |
747e1639 | 517 | && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) { |
0f113f3e MC |
518 | /* |
519 | * We now have application data between CCS and Finished. Most likely | |
520 | * the packets were reordered on their way, so buffer the application | |
521 | * data for later processing rather than dropping the connection. | |
522 | */ | |
24a1e2f2 | 523 | if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data), |
747e1639 | 524 | SSL3_RECORD_get_seq_num(rr)) < 0) { |
0f113f3e MC |
525 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); |
526 | return -1; | |
527 | } | |
747e1639 | 528 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
529 | goto start; |
530 | } | |
531 | ||
532 | /* | |
533 | * If the other end has shut down, throw anything we read away (even in | |
534 | * 'peek' mode) | |
535 | */ | |
536 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) { | |
747e1639 | 537 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
538 | s->rwstate = SSL_NOTHING; |
539 | return (0); | |
540 | } | |
541 | ||
c69f2adf MC |
542 | if (type == SSL3_RECORD_get_type(rr) |
543 | || (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC | |
544 | && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) { | |
545 | /* | |
546 | * SSL3_RT_APPLICATION_DATA or | |
547 | * SSL3_RT_HANDSHAKE or | |
548 | * SSL3_RT_CHANGE_CIPHER_SPEC | |
549 | */ | |
0f113f3e MC |
550 | /* |
551 | * make sure that we are not getting application data when we are | |
552 | * doing a handshake for the first time | |
553 | */ | |
554 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
555 | (s->enc_read_ctx == NULL)) { | |
556 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
557 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE); | |
558 | goto f_err; | |
559 | } | |
7e159e01 | 560 | |
c69f2adf MC |
561 | if (recvd_type != NULL) |
562 | *recvd_type = SSL3_RECORD_get_type(rr); | |
563 | ||
0f113f3e MC |
564 | if (len <= 0) |
565 | return (len); | |
566 | ||
747e1639 MC |
567 | if ((unsigned int)len > SSL3_RECORD_get_length(rr)) |
568 | n = SSL3_RECORD_get_length(rr); | |
0f113f3e MC |
569 | else |
570 | n = (unsigned int)len; | |
571 | ||
747e1639 | 572 | memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n); |
0f113f3e | 573 | if (!peek) { |
747e1639 MC |
574 | SSL3_RECORD_add_length(rr, -n); |
575 | SSL3_RECORD_add_off(rr, n); | |
576 | if (SSL3_RECORD_get_length(rr) == 0) { | |
295c3f41 | 577 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
747e1639 | 578 | SSL3_RECORD_set_off(rr, 0); |
0f113f3e MC |
579 | } |
580 | } | |
7e159e01 | 581 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
582 | /* |
583 | * We were about to renegotiate but had to read belated application | |
584 | * data first, so retry. | |
585 | */ | |
586 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
747e1639 | 587 | SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA && |
fe3a3291 | 588 | ossl_statem_in_sctp_read_sock(s)) { |
0f113f3e MC |
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 | ||
747e1639 | 623 | if (SSL3_RECORD_get_type(rr) == 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; | |
747e1639 | 627 | } else if (SSL3_RECORD_get_type(rr) == 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 |
747e1639 | 633 | else if (SSL3_RECORD_get_type(rr) == TLS1_RT_HEARTBEAT) { |
69f68237 | 634 | /* We allow a 0 return */ |
61986d32 | 635 | if (dtls1_process_heartbeat(s, SSL3_RECORD_get_data(rr), |
747e1639 | 636 | SSL3_RECORD_get_length(rr)) < 0) { |
69f68237 MC |
637 | return -1; |
638 | } | |
0f113f3e | 639 | /* Exit and notify application to read again */ |
747e1639 | 640 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
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 | 647 | /* else it's a CCS message, or application data or wrong */ |
747e1639 | 648 | else if (SSL3_RECORD_get_type(rr) != SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
649 | /* |
650 | * Application data while renegotiating is allowed. Try again | |
651 | * reading. | |
652 | */ | |
747e1639 | 653 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA) { |
0f113f3e MC |
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 | */ | |
747e1639 | 674 | if (SSL3_RECORD_get_length(rr) < 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 |
747e1639 MC |
683 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
684 | SSL3_RECORD_set_length(rr, 0); | |
0f113f3e MC |
685 | goto start; |
686 | } | |
687 | ||
688 | /* now move 'n' bytes: */ | |
689 | for (k = 0; k < dest_maxlen; k++) { | |
747e1639 MC |
690 | dest[k] = SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]; |
691 | SSL3_RECORD_add_off(rr, 1); | |
692 | SSL3_RECORD_add_length(rr, -1); | |
0f113f3e MC |
693 | } |
694 | *dest_len = dest_maxlen; | |
695 | } | |
696 | } | |
697 | ||
35a1cc90 | 698 | /*- |
c661ac16 MC |
699 | * s->rlayer.d->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE; |
700 | * s->rlayer.d->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT. | |
35a1cc90 MC |
701 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) |
702 | */ | |
0f113f3e MC |
703 | |
704 | /* If we are a client, check for an incoming 'Hello Request': */ | |
705 | if ((!s->server) && | |
c661ac16 MC |
706 | (s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
707 | (s->rlayer.d->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && | |
0f113f3e | 708 | (s->session != NULL) && (s->session->cipher != NULL)) { |
c661ac16 | 709 | s->rlayer.d->handshake_fragment_len = 0; |
0f113f3e | 710 | |
c661ac16 MC |
711 | if ((s->rlayer.d->handshake_fragment[1] != 0) || |
712 | (s->rlayer.d->handshake_fragment[2] != 0) || | |
713 | (s->rlayer.d->handshake_fragment[3] != 0)) { | |
0f113f3e MC |
714 | al = SSL_AD_DECODE_ERROR; |
715 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_HELLO_REQUEST); | |
4dc1aa04 | 716 | goto f_err; |
0f113f3e MC |
717 | } |
718 | ||
719 | /* | |
720 | * no need to check sequence number on HELLO REQUEST messages | |
721 | */ | |
722 | ||
723 | if (s->msg_callback) | |
724 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
c661ac16 | 725 | s->rlayer.d->handshake_fragment, 4, s, |
0f113f3e MC |
726 | s->msg_callback_arg); |
727 | ||
728 | if (SSL_is_init_finished(s) && | |
729 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && | |
730 | !s->s3->renegotiate) { | |
731 | s->d1->handshake_read_seq++; | |
732 | s->new_session = 1; | |
733 | ssl3_renegotiate(s); | |
734 | if (ssl3_renegotiate_check(s)) { | |
735 | i = s->handshake_func(s); | |
736 | if (i < 0) | |
737 | return (i); | |
738 | if (i == 0) { | |
739 | SSLerr(SSL_F_DTLS1_READ_BYTES, | |
740 | SSL_R_SSL_HANDSHAKE_FAILURE); | |
741 | return (-1); | |
742 | } | |
743 | ||
744 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 745 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 746 | /* no read-ahead left? */ |
0f113f3e MC |
747 | BIO *bio; |
748 | /* | |
749 | * In the case where we try to read application data, | |
750 | * but we trigger an SSL handshake, we return -1 with | |
751 | * the retry option set. Otherwise renegotiation may | |
752 | * cause nasty problems in the blocking world | |
753 | */ | |
754 | s->rwstate = SSL_READING; | |
755 | bio = SSL_get_rbio(s); | |
756 | BIO_clear_retry_flags(bio); | |
757 | BIO_set_retry_read(bio); | |
758 | return (-1); | |
759 | } | |
760 | } | |
761 | } | |
762 | } | |
763 | /* | |
764 | * we either finished a handshake or ignored the request, now try | |
765 | * again to obtain the (application) data we were asked for | |
766 | */ | |
767 | goto start; | |
768 | } | |
769 | ||
c661ac16 MC |
770 | if (s->rlayer.d->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) { |
771 | int alert_level = s->rlayer.d->alert_fragment[0]; | |
772 | int alert_descr = s->rlayer.d->alert_fragment[1]; | |
0f113f3e | 773 | |
c661ac16 | 774 | s->rlayer.d->alert_fragment_len = 0; |
0f113f3e MC |
775 | |
776 | if (s->msg_callback) | |
777 | s->msg_callback(0, s->version, SSL3_RT_ALERT, | |
c661ac16 MC |
778 | s->rlayer.d->alert_fragment, 2, s, |
779 | s->msg_callback_arg); | |
0f113f3e MC |
780 | |
781 | if (s->info_callback != NULL) | |
782 | cb = s->info_callback; | |
783 | else if (s->ctx->info_callback != NULL) | |
784 | cb = s->ctx->info_callback; | |
785 | ||
786 | if (cb != NULL) { | |
787 | j = (alert_level << 8) | alert_descr; | |
788 | cb(s, SSL_CB_READ_ALERT, j); | |
789 | } | |
790 | ||
fd865cad | 791 | if (alert_level == SSL3_AL_WARNING) { |
0f113f3e MC |
792 | s->s3->warn_alert = alert_descr; |
793 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) { | |
7e159e01 | 794 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
795 | /* |
796 | * With SCTP and streams the socket may deliver app data | |
797 | * after a close_notify alert. We have to check this first so | |
798 | * that nothing gets discarded. | |
799 | */ | |
800 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
801 | BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
802 | s->d1->shutdown_received = 1; | |
803 | s->rwstate = SSL_READING; | |
804 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
805 | BIO_set_retry_read(SSL_get_rbio(s)); | |
806 | return -1; | |
807 | } | |
7e159e01 | 808 | #endif |
0f113f3e MC |
809 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; |
810 | return (0); | |
811 | } | |
36d16f8e BL |
812 | #if 0 |
813 | /* XXX: this is a possible improvement in the future */ | |
0f113f3e MC |
814 | /* now check if it's a missing record */ |
815 | if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) { | |
816 | unsigned short seq; | |
817 | unsigned int frag_off; | |
c661ac16 | 818 | unsigned char *p = &(s->rlayer.d->alert_fragment[2]); |
0f113f3e MC |
819 | |
820 | n2s(p, seq); | |
821 | n2l3(p, frag_off); | |
822 | ||
823 | dtls1_retransmit_message(s, | |
824 | dtls1_get_queue_priority | |
825 | (frag->msg_header.seq, 0), frag_off, | |
826 | &found); | |
827 | if (!found && SSL_in_init(s)) { | |
828 | /* | |
829 | * fprintf( stderr,"in init = %d\n", SSL_in_init(s)); | |
830 | */ | |
831 | /* | |
832 | * requested a message not yet sent, send an alert | |
833 | * ourselves | |
834 | */ | |
835 | ssl3_send_alert(s, SSL3_AL_WARNING, | |
836 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); | |
837 | } | |
838 | } | |
36d16f8e | 839 | #endif |
fd865cad | 840 | } else if (alert_level == SSL3_AL_FATAL) { |
0f113f3e MC |
841 | char tmp[16]; |
842 | ||
843 | s->rwstate = SSL_NOTHING; | |
844 | s->s3->fatal_alert = alert_descr; | |
845 | SSLerr(SSL_F_DTLS1_READ_BYTES, | |
846 | SSL_AD_REASON_OFFSET + alert_descr); | |
847 | BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr); | |
848 | ERR_add_error_data(2, "SSL alert number ", tmp); | |
849 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
850 | SSL_CTX_remove_session(s->ctx, s->session); | |
851 | return (0); | |
852 | } else { | |
853 | al = SSL_AD_ILLEGAL_PARAMETER; | |
854 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE); | |
855 | goto f_err; | |
856 | } | |
857 | ||
858 | goto start; | |
859 | } | |
860 | ||
861 | if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a | |
862 | * shutdown */ | |
863 | s->rwstate = SSL_NOTHING; | |
747e1639 | 864 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
865 | return (0); |
866 | } | |
867 | ||
747e1639 | 868 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
869 | /* |
870 | * We can't process a CCS now, because previous handshake messages | |
871 | * are still missing, so just drop it. | |
872 | */ | |
c69f2adf | 873 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
874 | goto start; |
875 | } | |
876 | ||
877 | /* | |
878 | * Unexpected handshake message (Client Hello, or protocol violation) | |
879 | */ | |
c661ac16 | 880 | if ((s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
024f543c | 881 | !ossl_statem_get_in_handshake(s)) { |
0f113f3e MC |
882 | struct hm_header_st msg_hdr; |
883 | ||
884 | /* this may just be a stale retransmit */ | |
885 | dtls1_get_message_header(rr->data, &msg_hdr); | |
747e1639 MC |
886 | if (SSL3_RECORD_get_epoch(rr) != s->rlayer.d->r_epoch) { |
887 | SSL3_RECORD_set_length(rr, 0); | |
0f113f3e MC |
888 | goto start; |
889 | } | |
890 | ||
891 | /* | |
892 | * If we are server, we may have a repeated FINISHED of the client | |
893 | * here, then retransmit our CCS and FINISHED. | |
894 | */ | |
895 | if (msg_hdr.type == SSL3_MT_FINISHED) { | |
896 | if (dtls1_check_timeout_num(s) < 0) | |
897 | return -1; | |
898 | ||
17dd65e6 | 899 | dtls1_retransmit_buffered_messages(s); |
747e1639 | 900 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
901 | goto start; |
902 | } | |
903 | ||
49ae7423 | 904 | if (SSL_is_init_finished(s) && |
0f113f3e | 905 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) { |
fe3a3291 | 906 | ossl_statem_set_in_init(s, 1); |
0f113f3e MC |
907 | s->renegotiate = 1; |
908 | s->new_session = 1; | |
909 | } | |
910 | i = s->handshake_func(s); | |
911 | if (i < 0) | |
912 | return (i); | |
913 | if (i == 0) { | |
914 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
915 | return (-1); | |
916 | } | |
917 | ||
918 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 919 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 920 | /* no read-ahead left? */ |
0f113f3e MC |
921 | BIO *bio; |
922 | /* | |
923 | * In the case where we try to read application data, but we | |
924 | * trigger an SSL handshake, we return -1 with the retry | |
925 | * option set. Otherwise renegotiation may cause nasty | |
926 | * problems in the blocking world | |
927 | */ | |
928 | s->rwstate = SSL_READING; | |
929 | bio = SSL_get_rbio(s); | |
930 | BIO_clear_retry_flags(bio); | |
931 | BIO_set_retry_read(bio); | |
932 | return (-1); | |
933 | } | |
934 | } | |
935 | goto start; | |
936 | } | |
937 | ||
747e1639 | 938 | switch (SSL3_RECORD_get_type(rr)) { |
0f113f3e | 939 | default: |
0f113f3e MC |
940 | /* TLS just ignores unknown message types */ |
941 | if (s->version == TLS1_VERSION) { | |
747e1639 | 942 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
943 | goto start; |
944 | } | |
0f113f3e MC |
945 | al = SSL_AD_UNEXPECTED_MESSAGE; |
946 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
947 | goto f_err; | |
948 | case SSL3_RT_CHANGE_CIPHER_SPEC: | |
949 | case SSL3_RT_ALERT: | |
950 | case SSL3_RT_HANDSHAKE: | |
951 | /* | |
952 | * we already handled all of these, with the possible exception of | |
024f543c MC |
953 | * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but |
954 | * that should not happen when type != rr->type | |
0f113f3e MC |
955 | */ |
956 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
957 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
958 | goto f_err; | |
959 | case SSL3_RT_APPLICATION_DATA: | |
960 | /* | |
961 | * At this point, we were expecting handshake data, but have | |
962 | * application data. If the library was running inside ssl3_read() | |
963 | * (i.e. in_read_app_data is set) and it makes sense to read | |
964 | * application data at this point (session renegotiation not yet | |
965 | * started), we will indulge it. | |
966 | */ | |
967 | if (s->s3->in_read_app_data && | |
968 | (s->s3->total_renegotiations != 0) && | |
fe3a3291 | 969 | ossl_statem_app_data_allowed(s)) { |
0f113f3e MC |
970 | s->s3->in_read_app_data = 2; |
971 | return (-1); | |
972 | } else { | |
973 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
974 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
975 | goto f_err; | |
976 | } | |
977 | } | |
978 | /* not reached */ | |
979 | ||
980 | f_err: | |
981 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
0f113f3e MC |
982 | return (-1); |
983 | } | |
984 | ||
0f113f3e MC |
985 | |
986 | /* | |
987 | * this only happens when a client hello is received and a handshake | |
988 | * is started. | |
989 | */ | |
6f7ae319 MC |
990 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
991 | int len, int peek) | |
0f113f3e MC |
992 | { |
993 | ||
c661ac16 MC |
994 | if ((type == SSL3_RT_HANDSHAKE) |
995 | && (s->rlayer.d->handshake_fragment_len > 0)) | |
0f113f3e MC |
996 | /* (partially) satisfy request from storage */ |
997 | { | |
c661ac16 | 998 | unsigned char *src = s->rlayer.d->handshake_fragment; |
0f113f3e MC |
999 | unsigned char *dst = buf; |
1000 | unsigned int k, n; | |
1001 | ||
1002 | /* peek == 0 */ | |
1003 | n = 0; | |
c661ac16 | 1004 | while ((len > 0) && (s->rlayer.d->handshake_fragment_len > 0)) { |
0f113f3e MC |
1005 | *dst++ = *src++; |
1006 | len--; | |
c661ac16 | 1007 | s->rlayer.d->handshake_fragment_len--; |
0f113f3e MC |
1008 | n++; |
1009 | } | |
1010 | /* move any remaining fragment bytes: */ | |
c661ac16 MC |
1011 | for (k = 0; k < s->rlayer.d->handshake_fragment_len; k++) |
1012 | s->rlayer.d->handshake_fragment[k] = *src++; | |
0f113f3e MC |
1013 | return n; |
1014 | } | |
1015 | ||
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * Call this to write data in records of type 'type' It will return <= 0 if | |
1021 | * not all data has been sent or non-blocking IO. | |
36d16f8e | 1022 | */ |
480b9e5d | 1023 | int dtls1_write_bytes(SSL *s, int type, const void *buf, int len) |
0f113f3e MC |
1024 | { |
1025 | int i; | |
1026 | ||
1027 | OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH); | |
1028 | s->rwstate = SSL_NOTHING; | |
1029 | i = do_dtls1_write(s, type, buf, len, 0); | |
1030 | return i; | |
1031 | } | |
1032 | ||
1033 | int do_dtls1_write(SSL *s, int type, const unsigned char *buf, | |
1034 | unsigned int len, int create_empty_fragment) | |
1035 | { | |
1036 | unsigned char *p, *pseq; | |
1037 | int i, mac_size, clear = 0; | |
1038 | int prefix_len = 0; | |
1039 | int eivlen; | |
1040 | SSL3_RECORD *wr; | |
1041 | SSL3_BUFFER *wb; | |
1042 | SSL_SESSION *sess; | |
1043 | ||
88c23039 | 1044 | wb = &s->rlayer.wbuf; |
db9a32e7 | 1045 | |
0f113f3e MC |
1046 | /* |
1047 | * first check if there is a SSL3_BUFFER still being written out. This | |
1048 | * will happen with non blocking IO | |
1049 | */ | |
db9a32e7 | 1050 | if (SSL3_BUFFER_get_left(wb) != 0) { |
0f113f3e MC |
1051 | OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */ |
1052 | return (ssl3_write_pending(s, type, buf, len)); | |
1053 | } | |
1054 | ||
1055 | /* If we have an alert to send, lets send it */ | |
1056 | if (s->s3->alert_dispatch) { | |
1057 | i = s->method->ssl_dispatch_alert(s); | |
1058 | if (i <= 0) | |
1059 | return (i); | |
1060 | /* if it went, fall through and send more stuff */ | |
1061 | } | |
1062 | ||
1063 | if (len == 0 && !create_empty_fragment) | |
1064 | return 0; | |
1065 | ||
88c23039 | 1066 | wr = &s->rlayer.wrec; |
0f113f3e MC |
1067 | sess = s->session; |
1068 | ||
1069 | if ((sess == NULL) || | |
1070 | (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL)) | |
1071 | clear = 1; | |
1072 | ||
1073 | if (clear) | |
1074 | mac_size = 0; | |
1075 | else { | |
1076 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
1077 | if (mac_size < 0) | |
1078 | goto err; | |
1079 | } | |
1080 | ||
747e1639 | 1081 | p = SSL3_BUFFER_get_buf(wb) + prefix_len; |
0f113f3e MC |
1082 | |
1083 | /* write the header */ | |
1084 | ||
1085 | *(p++) = type & 0xff; | |
747e1639 | 1086 | SSL3_RECORD_set_type(wr, type); |
0f113f3e MC |
1087 | /* |
1088 | * Special case: for hello verify request, client version 1.0 and we | |
1089 | * haven't decided which version to use yet send back using version 1.0 | |
1090 | * header: otherwise some clients will ignore it. | |
1091 | */ | |
1092 | if (s->method->version == DTLS_ANY_VERSION) { | |
1093 | *(p++) = DTLS1_VERSION >> 8; | |
1094 | *(p++) = DTLS1_VERSION & 0xff; | |
1095 | } else { | |
1096 | *(p++) = s->version >> 8; | |
1097 | *(p++) = s->version & 0xff; | |
1098 | } | |
1099 | ||
1100 | /* field where we are to write out packet epoch, seq num and len */ | |
1101 | pseq = p; | |
1102 | p += 10; | |
1103 | ||
1104 | /* Explicit IV length, block ciphers appropriate version flag */ | |
1105 | if (s->enc_write_ctx) { | |
1106 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx); | |
1107 | if (mode == EVP_CIPH_CBC_MODE) { | |
1108 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx); | |
1109 | if (eivlen <= 1) | |
1110 | eivlen = 0; | |
1111 | } | |
1112 | /* Need explicit part of IV for GCM mode */ | |
1113 | else if (mode == EVP_CIPH_GCM_MODE) | |
1114 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
e75c5a79 DSH |
1115 | else if (mode == EVP_CIPH_CCM_MODE) |
1116 | eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN; | |
0f113f3e MC |
1117 | else |
1118 | eivlen = 0; | |
1119 | } else | |
1120 | eivlen = 0; | |
1121 | ||
1122 | /* lets setup the record stuff. */ | |
747e1639 MC |
1123 | SSL3_RECORD_set_data(wr, p + eivlen); /* make room for IV in case of CBC */ |
1124 | SSL3_RECORD_set_length(wr, (int)len); | |
1125 | SSL3_RECORD_set_input(wr, (unsigned char *)buf); | |
0f113f3e MC |
1126 | |
1127 | /* | |
1128 | * we now 'read' from wr->input, wr->length bytes into wr->data | |
1129 | */ | |
1130 | ||
1131 | /* first we compress */ | |
1132 | if (s->compress != NULL) { | |
1133 | if (!ssl3_do_compress(s)) { | |
1134 | SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_COMPRESSION_FAILURE); | |
1135 | goto err; | |
1136 | } | |
1137 | } else { | |
747e1639 MC |
1138 | memcpy(SSL3_RECORD_get_data(wr), SSL3_RECORD_get_input(wr), |
1139 | SSL3_RECORD_get_length(wr)); | |
1140 | SSL3_RECORD_reset_input(wr); | |
0f113f3e | 1141 | } |
36d16f8e | 1142 | |
0f113f3e MC |
1143 | /* |
1144 | * we should still have the output to wr->data and the input from | |
1145 | * wr->input. Length should be wr->length. wr->data still points in the | |
1146 | * wb->buf | |
1147 | */ | |
36d16f8e | 1148 | |
0f113f3e | 1149 | if (mac_size != 0) { |
747e1639 MC |
1150 | if (s->method->ssl3_enc->mac(s, |
1151 | &(p[SSL3_RECORD_get_length(wr) + eivlen]), 1) < 0) | |
0f113f3e | 1152 | goto err; |
747e1639 | 1153 | SSL3_RECORD_add_length(wr, mac_size); |
0f113f3e | 1154 | } |
36d16f8e | 1155 | |
0f113f3e | 1156 | /* this is true regardless of mac size */ |
747e1639 MC |
1157 | SSL3_RECORD_set_data(wr, p); |
1158 | SSL3_RECORD_reset_input(wr); | |
36d16f8e | 1159 | |
0f113f3e | 1160 | if (eivlen) |
747e1639 | 1161 | SSL3_RECORD_add_length(wr, eivlen); |
36d16f8e | 1162 | |
0f113f3e MC |
1163 | if (s->method->ssl3_enc->enc(s, 1) < 1) |
1164 | goto err; | |
36d16f8e | 1165 | |
0f113f3e MC |
1166 | /* record length after mac and block padding */ |
1167 | /* | |
1168 | * if (type == SSL3_RT_APPLICATION_DATA || (type == SSL3_RT_ALERT && ! | |
1169 | * SSL_in_init(s))) | |
1170 | */ | |
36d16f8e | 1171 | |
0f113f3e | 1172 | /* there's only one epoch between handshake and app data */ |
36d16f8e | 1173 | |
78a39fe7 | 1174 | s2n(s->rlayer.d->w_epoch, pseq); |
36d16f8e | 1175 | |
0f113f3e MC |
1176 | /* XDTLS: ?? */ |
1177 | /* | |
1178 | * else s2n(s->d1->handshake_epoch, pseq); | |
1179 | */ | |
36d16f8e | 1180 | |
de07f311 | 1181 | memcpy(pseq, &(s->rlayer.write_sequence[2]), 6); |
0f113f3e | 1182 | pseq += 6; |
747e1639 | 1183 | s2n(SSL3_RECORD_get_length(wr), pseq); |
36d16f8e | 1184 | |
0f113f3e MC |
1185 | if (s->msg_callback) |
1186 | s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH, | |
1187 | DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg); | |
36d16f8e | 1188 | |
0f113f3e MC |
1189 | /* |
1190 | * we should now have wr->data pointing to the encrypted data, which is | |
1191 | * wr->length long | |
1192 | */ | |
747e1639 MC |
1193 | SSL3_RECORD_set_type(wr, type); /* not needed but helps for debugging */ |
1194 | SSL3_RECORD_add_length(wr, DTLS1_RT_HEADER_LENGTH); | |
36d16f8e | 1195 | |
de07f311 | 1196 | ssl3_record_sequence_update(&(s->rlayer.write_sequence[0])); |
36d16f8e | 1197 | |
0f113f3e MC |
1198 | if (create_empty_fragment) { |
1199 | /* | |
1200 | * we are in a recursive call; just return the length, don't write | |
1201 | * out anything here | |
1202 | */ | |
1203 | return wr->length; | |
1204 | } | |
36d16f8e | 1205 | |
0f113f3e | 1206 | /* now let's set up wb */ |
747e1639 MC |
1207 | SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(wr)); |
1208 | SSL3_BUFFER_set_offset(wb, 0); | |
0f113f3e MC |
1209 | |
1210 | /* | |
1211 | * memorize arguments so that ssl3_write_pending can detect bad write | |
1212 | * retries later | |
1213 | */ | |
f8caa3c8 MC |
1214 | s->rlayer.wpend_tot = len; |
1215 | s->rlayer.wpend_buf = buf; | |
1216 | s->rlayer.wpend_type = type; | |
1217 | s->rlayer.wpend_ret = len; | |
0f113f3e MC |
1218 | |
1219 | /* we now just need to write the buffer */ | |
1220 | return ssl3_write_pending(s, type, buf, len); | |
1221 | err: | |
1222 | return -1; | |
1223 | } | |
36d16f8e | 1224 | |
fe589e61 | 1225 | DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, |
0f113f3e MC |
1226 | unsigned int *is_next_epoch) |
1227 | { | |
1228 | ||
36d16f8e BL |
1229 | *is_next_epoch = 0; |
1230 | ||
1231 | /* In current epoch, accept HM, CCS, DATA, & ALERT */ | |
78a39fe7 | 1232 | if (rr->epoch == s->rlayer.d->r_epoch) |
91f93f69 | 1233 | return &s->rlayer.d->bitmap; |
36d16f8e BL |
1234 | |
1235 | /* Only HM and ALERT messages can be from the next epoch */ | |
78a39fe7 MC |
1236 | else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) && |
1237 | (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) { | |
36d16f8e | 1238 | *is_next_epoch = 1; |
91f93f69 | 1239 | return &s->rlayer.d->next_bitmap; |
0f113f3e | 1240 | } |
36d16f8e BL |
1241 | |
1242 | return NULL; | |
0f113f3e | 1243 | } |
36d16f8e | 1244 | |
0f113f3e MC |
1245 | void dtls1_reset_seq_numbers(SSL *s, int rw) |
1246 | { | |
1247 | unsigned char *seq; | |
de07f311 | 1248 | unsigned int seq_bytes = sizeof(s->rlayer.read_sequence); |
0f113f3e MC |
1249 | |
1250 | if (rw & SSL3_CC_READ) { | |
de07f311 | 1251 | seq = s->rlayer.read_sequence; |
78a39fe7 | 1252 | s->rlayer.d->r_epoch++; |
16f8d4eb RS |
1253 | memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap, |
1254 | sizeof(s->rlayer.d->bitmap)); | |
1255 | memset(&s->rlayer.d->next_bitmap, 0, | |
1256 | sizeof(s->rlayer.d->next_bitmap)); | |
0f113f3e | 1257 | } else { |
de07f311 | 1258 | seq = s->rlayer.write_sequence; |
3bb8f87d | 1259 | memcpy(s->rlayer.d->last_write_sequence, seq, |
de07f311 | 1260 | sizeof(s->rlayer.write_sequence)); |
78a39fe7 | 1261 | s->rlayer.d->w_epoch++; |
0f113f3e MC |
1262 | } |
1263 | ||
16f8d4eb | 1264 | memset(seq, 0, seq_bytes); |
0f113f3e | 1265 | } |