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Commit | Line | Data |
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0f113f3e | 1 | /* |
846e33c7 | 2 | * Copyright 2005-2016 The OpenSSL Project Authors. All Rights Reserved. |
0f113f3e | 3 | * |
846e33c7 RS |
4 | * Licensed under the OpenSSL license (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
36d16f8e BL |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
11 | #include <errno.h> | |
12 | #define USE_SOCKETS | |
999005e4 | 13 | #include "../ssl_locl.h" |
36d16f8e BL |
14 | #include <openssl/evp.h> |
15 | #include <openssl/buffer.h> | |
1711f8de | 16 | #include "record_locl.h" |
40f37188 MC |
17 | |
18 | int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl) | |
19 | { | |
20 | DTLS_RECORD_LAYER *d; | |
0485d540 | 21 | |
b4faea50 | 22 | if ((d = OPENSSL_malloc(sizeof(*d))) == NULL) |
40f37188 | 23 | return (0); |
40f37188 MC |
24 | |
25 | rl->d = d; | |
5fb6f80c | 26 | |
cb2ce7ab MC |
27 | d->unprocessed_rcds.q = pqueue_new(); |
28 | d->processed_rcds.q = pqueue_new(); | |
24a1e2f2 | 29 | d->buffered_app_data.q = pqueue_new(); |
cb2ce7ab | 30 | |
a71edf3b MC |
31 | if (d->unprocessed_rcds.q == NULL || d->processed_rcds.q == NULL |
32 | || d->buffered_app_data.q == NULL) { | |
25aaa98a RS |
33 | pqueue_free(d->unprocessed_rcds.q); |
34 | pqueue_free(d->processed_rcds.q); | |
35 | pqueue_free(d->buffered_app_data.q); | |
cb2ce7ab MC |
36 | OPENSSL_free(d); |
37 | rl->d = NULL; | |
38 | return (0); | |
39 | } | |
40f37188 MC |
40 | |
41 | return 1; | |
42 | } | |
43 | ||
44 | void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl) | |
45 | { | |
cb2ce7ab MC |
46 | DTLS_RECORD_LAYER_clear(rl); |
47 | pqueue_free(rl->d->unprocessed_rcds.q); | |
48 | pqueue_free(rl->d->processed_rcds.q); | |
24a1e2f2 | 49 | pqueue_free(rl->d->buffered_app_data.q); |
40f37188 MC |
50 | OPENSSL_free(rl->d); |
51 | rl->d = NULL; | |
52 | } | |
53 | ||
54 | void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl) | |
55 | { | |
56 | DTLS_RECORD_LAYER *d; | |
cb2ce7ab MC |
57 | pitem *item = NULL; |
58 | DTLS1_RECORD_DATA *rdata; | |
cf2cede4 RS |
59 | pqueue *unprocessed_rcds; |
60 | pqueue *processed_rcds; | |
61 | pqueue *buffered_app_data; | |
cb2ce7ab | 62 | |
40f37188 | 63 | d = rl->d; |
0485d540 | 64 | |
cb2ce7ab MC |
65 | while ((item = pqueue_pop(d->unprocessed_rcds.q)) != NULL) { |
66 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
b548a1f1 | 67 | OPENSSL_free(rdata->rbuf.buf); |
cb2ce7ab MC |
68 | OPENSSL_free(item->data); |
69 | pitem_free(item); | |
70 | } | |
71 | ||
72 | while ((item = pqueue_pop(d->processed_rcds.q)) != NULL) { | |
73 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
b548a1f1 | 74 | OPENSSL_free(rdata->rbuf.buf); |
cb2ce7ab MC |
75 | OPENSSL_free(item->data); |
76 | pitem_free(item); | |
77 | } | |
78 | ||
24a1e2f2 MC |
79 | while ((item = pqueue_pop(d->buffered_app_data.q)) != NULL) { |
80 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
b548a1f1 | 81 | OPENSSL_free(rdata->rbuf.buf); |
24a1e2f2 MC |
82 | OPENSSL_free(item->data); |
83 | pitem_free(item); | |
84 | } | |
85 | ||
cb2ce7ab MC |
86 | unprocessed_rcds = d->unprocessed_rcds.q; |
87 | processed_rcds = d->processed_rcds.q; | |
24a1e2f2 | 88 | buffered_app_data = d->buffered_app_data.q; |
b4faea50 | 89 | memset(d, 0, sizeof(*d)); |
cb2ce7ab MC |
90 | d->unprocessed_rcds.q = unprocessed_rcds; |
91 | d->processed_rcds.q = processed_rcds; | |
24a1e2f2 | 92 | d->buffered_app_data.q = buffered_app_data; |
40f37188 MC |
93 | } |
94 | ||
3bb8f87d MC |
95 | void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e) |
96 | { | |
97 | if (e == rl->d->w_epoch - 1) { | |
98 | memcpy(rl->d->curr_write_sequence, | |
a230b26e | 99 | rl->write_sequence, sizeof(rl->write_sequence)); |
3bb8f87d | 100 | memcpy(rl->write_sequence, |
a230b26e | 101 | rl->d->last_write_sequence, sizeof(rl->write_sequence)); |
3bb8f87d MC |
102 | } else if (e == rl->d->w_epoch + 1) { |
103 | memcpy(rl->d->last_write_sequence, | |
a230b26e | 104 | rl->write_sequence, sizeof(unsigned char[8])); |
3bb8f87d | 105 | memcpy(rl->write_sequence, |
a230b26e | 106 | rl->d->curr_write_sequence, sizeof(rl->write_sequence)); |
3bb8f87d MC |
107 | } |
108 | rl->d->w_epoch = e; | |
109 | } | |
110 | ||
44cc35d3 MC |
111 | void DTLS_RECORD_LAYER_resync_write(RECORD_LAYER *rl) |
112 | { | |
113 | memcpy(rl->write_sequence, rl->read_sequence, sizeof(rl->write_sequence)); | |
114 | } | |
115 | ||
e3d0dae7 MC |
116 | void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq) |
117 | { | |
118 | memcpy(rl->write_sequence, seq, SEQ_NUM_SIZE); | |
119 | } | |
120 | ||
0f113f3e | 121 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
a773b52a | 122 | int len); |
36d16f8e | 123 | |
36d16f8e | 124 | /* copy buffered record into SSL structure */ |
0f113f3e MC |
125 | static int dtls1_copy_record(SSL *s, pitem *item) |
126 | { | |
36d16f8e BL |
127 | DTLS1_RECORD_DATA *rdata; |
128 | ||
129 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
0f113f3e | 130 | |
88c23039 | 131 | SSL3_BUFFER_release(&s->rlayer.rbuf); |
0f113f3e | 132 | |
7a7048af MC |
133 | s->rlayer.packet = rdata->packet; |
134 | s->rlayer.packet_length = rdata->packet_length; | |
88c23039 MC |
135 | memcpy(&s->rlayer.rbuf, &(rdata->rbuf), sizeof(SSL3_BUFFER)); |
136 | memcpy(&s->rlayer.rrec, &(rdata->rrec), sizeof(SSL3_RECORD)); | |
36d16f8e | 137 | |
0f113f3e | 138 | /* Set proper sequence number for mac calculation */ |
de07f311 | 139 | memcpy(&(s->rlayer.read_sequence[2]), &(rdata->packet[5]), 6); |
0f113f3e MC |
140 | |
141 | return (1); | |
142 | } | |
36d16f8e | 143 | |
6f7ae319 | 144 | int dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority) |
0f113f3e MC |
145 | { |
146 | DTLS1_RECORD_DATA *rdata; | |
147 | pitem *item; | |
148 | ||
149 | /* Limit the size of the queue to prevent DOS attacks */ | |
150 | if (pqueue_size(queue->q) >= 100) | |
151 | return 0; | |
152 | ||
b4faea50 | 153 | rdata = OPENSSL_malloc(sizeof(*rdata)); |
0f113f3e MC |
154 | item = pitem_new(priority, rdata); |
155 | if (rdata == NULL || item == NULL) { | |
b548a1f1 | 156 | OPENSSL_free(rdata); |
25aaa98a | 157 | pitem_free(item); |
0f113f3e | 158 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); |
06c6a2b4 | 159 | return -1; |
0f113f3e MC |
160 | } |
161 | ||
7a7048af MC |
162 | rdata->packet = s->rlayer.packet; |
163 | rdata->packet_length = s->rlayer.packet_length; | |
88c23039 MC |
164 | memcpy(&(rdata->rbuf), &s->rlayer.rbuf, sizeof(SSL3_BUFFER)); |
165 | memcpy(&(rdata->rrec), &s->rlayer.rrec, sizeof(SSL3_RECORD)); | |
0f113f3e MC |
166 | |
167 | item->data = rdata; | |
36d16f8e | 168 | |
7e159e01 | 169 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
170 | /* Store bio_dgram_sctp_rcvinfo struct */ |
171 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
5998e290 MC |
172 | (SSL_get_state(s) == TLS_ST_SR_FINISHED |
173 | || SSL_get_state(s) == TLS_ST_CR_FINISHED)) { | |
0f113f3e MC |
174 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO, |
175 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
176 | } | |
7e159e01 DSH |
177 | #endif |
178 | ||
7a7048af MC |
179 | s->rlayer.packet = NULL; |
180 | s->rlayer.packet_length = 0; | |
16f8d4eb RS |
181 | memset(&s->rlayer.rbuf, 0, sizeof(s->rlayer.rbuf)); |
182 | memset(&s->rlayer.rrec, 0, sizeof(s->rlayer.rrec)); | |
0f113f3e MC |
183 | |
184 | if (!ssl3_setup_buffers(s)) { | |
185 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); | |
b548a1f1 | 186 | OPENSSL_free(rdata->rbuf.buf); |
0f113f3e MC |
187 | OPENSSL_free(rdata); |
188 | pitem_free(item); | |
189 | return (-1); | |
190 | } | |
36d16f8e | 191 | |
0f113f3e MC |
192 | /* insert should not fail, since duplicates are dropped */ |
193 | if (pqueue_insert(queue->q, item) == NULL) { | |
194 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); | |
b548a1f1 | 195 | OPENSSL_free(rdata->rbuf.buf); |
0f113f3e MC |
196 | OPENSSL_free(rdata); |
197 | pitem_free(item); | |
198 | return (-1); | |
199 | } | |
36d16f8e | 200 | |
0f113f3e MC |
201 | return (1); |
202 | } | |
203 | ||
fe589e61 | 204 | int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue) |
0f113f3e | 205 | { |
36d16f8e BL |
206 | pitem *item; |
207 | ||
208 | item = pqueue_pop(queue->q); | |
0f113f3e | 209 | if (item) { |
36d16f8e BL |
210 | dtls1_copy_record(s, item); |
211 | ||
212 | OPENSSL_free(item->data); | |
0f113f3e | 213 | pitem_free(item); |
36d16f8e | 214 | |
0f113f3e | 215 | return (1); |
36d16f8e BL |
216 | } |
217 | ||
0f113f3e MC |
218 | return (0); |
219 | } | |
36d16f8e | 220 | |
0f113f3e MC |
221 | /* |
222 | * retrieve a buffered record that belongs to the new epoch, i.e., not | |
223 | * processed yet | |
224 | */ | |
36d16f8e BL |
225 | #define dtls1_get_unprocessed_record(s) \ |
226 | dtls1_retrieve_buffered_record((s), \ | |
cb2ce7ab | 227 | &((s)->rlayer.d->unprocessed_rcds)) |
36d16f8e | 228 | |
fe589e61 | 229 | int dtls1_process_buffered_records(SSL *s) |
0f113f3e | 230 | { |
36d16f8e | 231 | pitem *item; |
0f113f3e | 232 | |
cb2ce7ab | 233 | item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q); |
0f113f3e | 234 | if (item) { |
36d16f8e | 235 | /* Check if epoch is current. */ |
cb2ce7ab | 236 | if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch) |
0f113f3e MC |
237 | return (1); /* Nothing to do. */ |
238 | ||
36d16f8e | 239 | /* Process all the records. */ |
cb2ce7ab | 240 | while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) { |
36d16f8e | 241 | dtls1_get_unprocessed_record(s); |
0f113f3e MC |
242 | if (!dtls1_process_record(s)) |
243 | return (0); | |
cb2ce7ab | 244 | if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds), |
a230b26e EK |
245 | SSL3_RECORD_get_seq_num(s->rlayer.rrec)) < |
246 | 0) | |
103b171d | 247 | return -1; |
36d16f8e | 248 | } |
0f113f3e | 249 | } |
36d16f8e | 250 | |
0f113f3e MC |
251 | /* |
252 | * sync epoch numbers once all the unprocessed records have been | |
253 | * processed | |
254 | */ | |
cb2ce7ab MC |
255 | s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch; |
256 | s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1; | |
36d16f8e | 257 | |
0f113f3e MC |
258 | return (1); |
259 | } | |
36d16f8e | 260 | |
1d97c843 TH |
261 | /*- |
262 | * Return up to 'len' payload bytes received in 'type' records. | |
36d16f8e BL |
263 | * 'type' is one of the following: |
264 | * | |
265 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
266 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
267 | * - 0 (during a shutdown, no data has to be returned) | |
268 | * | |
269 | * If we don't have stored data to work from, read a SSL/TLS record first | |
270 | * (possibly multiple records if we still don't have anything to return). | |
271 | * | |
272 | * This function must handle any surprises the peer may have for us, such as | |
c69f2adf MC |
273 | * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec |
274 | * messages are treated as if they were handshake messages *if* the |recd_type| | |
275 | * argument is non NULL. | |
36d16f8e BL |
276 | * Also if record payloads contain fragments too small to process, we store |
277 | * them until there is enough for the respective protocol (the record protocol | |
278 | * may use arbitrary fragmentation and even interleaving): | |
279 | * Change cipher spec protocol | |
280 | * just 1 byte needed, no need for keeping anything stored | |
281 | * Alert protocol | |
282 | * 2 bytes needed (AlertLevel, AlertDescription) | |
283 | * Handshake protocol | |
284 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
285 | * to detect unexpected Client Hello and Hello Request messages | |
286 | * here, anything else is handled by higher layers | |
287 | * Application data protocol | |
288 | * none of our business | |
289 | */ | |
657da85e MC |
290 | int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf, |
291 | int len, int peek) | |
0f113f3e MC |
292 | { |
293 | int al, i, j, ret; | |
294 | unsigned int n; | |
295 | SSL3_RECORD *rr; | |
296 | void (*cb) (const SSL *ssl, int type2, int val) = NULL; | |
297 | ||
88c23039 | 298 | if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) { |
28d59af8 | 299 | /* Not initialized yet */ |
0f113f3e MC |
300 | if (!ssl3_setup_buffers(s)) |
301 | return (-1); | |
28d59af8 | 302 | } |
0f113f3e MC |
303 | |
304 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && | |
305 | (type != SSL3_RT_HANDSHAKE)) || | |
306 | (peek && (type != SSL3_RT_APPLICATION_DATA))) { | |
307 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
308 | return -1; | |
309 | } | |
310 | ||
311 | /* | |
312 | * check whether there's a handshake message (client hello?) waiting | |
313 | */ | |
a773b52a | 314 | if ((ret = have_handshake_fragment(s, type, buf, len))) |
0f113f3e MC |
315 | return ret; |
316 | ||
317 | /* | |
c661ac16 MC |
318 | * Now s->rlayer.d->handshake_fragment_len == 0 if |
319 | * type == SSL3_RT_HANDSHAKE. | |
0f113f3e | 320 | */ |
36d16f8e | 321 | |
7e159e01 | 322 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
323 | /* |
324 | * Continue handshake if it had to be interrupted to read app data with | |
325 | * SCTP. | |
326 | */ | |
024f543c | 327 | if ((!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) || |
8723588e | 328 | (BIO_dgram_is_sctp(SSL_get_rbio(s)) |
fe3a3291 | 329 | && ossl_statem_in_sctp_read_sock(s) |
0f113f3e | 330 | && s->s3->in_read_app_data != 2)) |
7e159e01 | 331 | #else |
024f543c | 332 | if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) |
7e159e01 | 333 | #endif |
0f113f3e MC |
334 | { |
335 | /* type == SSL3_RT_APPLICATION_DATA */ | |
336 | i = s->handshake_func(s); | |
337 | if (i < 0) | |
338 | return (i); | |
339 | if (i == 0) { | |
340 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
341 | return (-1); | |
342 | } | |
343 | } | |
344 | ||
345 | start: | |
346 | s->rwstate = SSL_NOTHING; | |
347 | ||
50e735f9 MC |
348 | /*- |
349 | * s->s3->rrec.type - is the type of record | |
350 | * s->s3->rrec.data, - data | |
351 | * s->s3->rrec.off, - offset into 'data' for next read | |
352 | * s->s3->rrec.length, - number of bytes. | |
353 | */ | |
94777c9c | 354 | rr = s->rlayer.rrec; |
0f113f3e MC |
355 | |
356 | /* | |
357 | * We are not handshaking and have no data yet, so process data buffered | |
358 | * during the last handshake in advance, if any. | |
359 | */ | |
49ae7423 | 360 | if (SSL_is_init_finished(s) && SSL3_RECORD_get_length(rr) == 0) { |
0f113f3e | 361 | pitem *item; |
24a1e2f2 | 362 | item = pqueue_pop(s->rlayer.d->buffered_app_data.q); |
0f113f3e | 363 | if (item) { |
7e159e01 | 364 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
365 | /* Restore bio_dgram_sctp_rcvinfo struct */ |
366 | if (BIO_dgram_is_sctp(SSL_get_rbio(s))) { | |
367 | DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data; | |
368 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO, | |
369 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
370 | } | |
7e159e01 DSH |
371 | #endif |
372 | ||
0f113f3e MC |
373 | dtls1_copy_record(s, item); |
374 | ||
375 | OPENSSL_free(item->data); | |
376 | pitem_free(item); | |
377 | } | |
378 | } | |
379 | ||
380 | /* Check for timeout */ | |
381 | if (dtls1_handle_timeout(s) > 0) | |
382 | goto start; | |
383 | ||
384 | /* get new packet if necessary */ | |
747e1639 | 385 | if ((SSL3_RECORD_get_length(rr) == 0) |
a230b26e | 386 | || (s->rlayer.rstate == SSL_ST_READ_BODY)) { |
0f113f3e MC |
387 | ret = dtls1_get_record(s); |
388 | if (ret <= 0) { | |
389 | ret = dtls1_read_failed(s, ret); | |
390 | /* anything other than a timeout is an error */ | |
391 | if (ret <= 0) | |
392 | return (ret); | |
393 | else | |
394 | goto start; | |
395 | } | |
396 | } | |
397 | ||
0f113f3e MC |
398 | /* we now have a packet which can be read and processed */ |
399 | ||
400 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, | |
401 | * reset by ssl3_get_finished */ | |
747e1639 | 402 | && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) { |
0f113f3e MC |
403 | /* |
404 | * We now have application data between CCS and Finished. Most likely | |
405 | * the packets were reordered on their way, so buffer the application | |
406 | * data for later processing rather than dropping the connection. | |
407 | */ | |
24a1e2f2 | 408 | if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data), |
a230b26e | 409 | SSL3_RECORD_get_seq_num(rr)) < 0) { |
0f113f3e MC |
410 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); |
411 | return -1; | |
412 | } | |
747e1639 | 413 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
414 | goto start; |
415 | } | |
416 | ||
417 | /* | |
418 | * If the other end has shut down, throw anything we read away (even in | |
419 | * 'peek' mode) | |
420 | */ | |
421 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) { | |
747e1639 | 422 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
423 | s->rwstate = SSL_NOTHING; |
424 | return (0); | |
425 | } | |
426 | ||
c69f2adf | 427 | if (type == SSL3_RECORD_get_type(rr) |
a230b26e EK |
428 | || (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC |
429 | && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) { | |
c69f2adf MC |
430 | /* |
431 | * SSL3_RT_APPLICATION_DATA or | |
432 | * SSL3_RT_HANDSHAKE or | |
433 | * SSL3_RT_CHANGE_CIPHER_SPEC | |
434 | */ | |
0f113f3e MC |
435 | /* |
436 | * make sure that we are not getting application data when we are | |
437 | * doing a handshake for the first time | |
438 | */ | |
439 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
440 | (s->enc_read_ctx == NULL)) { | |
441 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
442 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE); | |
443 | goto f_err; | |
444 | } | |
7e159e01 | 445 | |
c69f2adf MC |
446 | if (recvd_type != NULL) |
447 | *recvd_type = SSL3_RECORD_get_type(rr); | |
448 | ||
0f113f3e MC |
449 | if (len <= 0) |
450 | return (len); | |
451 | ||
747e1639 MC |
452 | if ((unsigned int)len > SSL3_RECORD_get_length(rr)) |
453 | n = SSL3_RECORD_get_length(rr); | |
0f113f3e MC |
454 | else |
455 | n = (unsigned int)len; | |
456 | ||
747e1639 | 457 | memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n); |
0f113f3e | 458 | if (!peek) { |
753be41d | 459 | SSL3_RECORD_sub_length(rr, n); |
747e1639 MC |
460 | SSL3_RECORD_add_off(rr, n); |
461 | if (SSL3_RECORD_get_length(rr) == 0) { | |
295c3f41 | 462 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
747e1639 | 463 | SSL3_RECORD_set_off(rr, 0); |
0f113f3e MC |
464 | } |
465 | } | |
7e159e01 | 466 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
467 | /* |
468 | * We were about to renegotiate but had to read belated application | |
469 | * data first, so retry. | |
470 | */ | |
471 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
747e1639 | 472 | SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA && |
fe3a3291 | 473 | ossl_statem_in_sctp_read_sock(s)) { |
0f113f3e MC |
474 | s->rwstate = SSL_READING; |
475 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
476 | BIO_set_retry_read(SSL_get_rbio(s)); | |
477 | } | |
478 | ||
479 | /* | |
480 | * We might had to delay a close_notify alert because of reordered | |
481 | * app data. If there was an alert and there is no message to read | |
482 | * anymore, finally set shutdown. | |
483 | */ | |
484 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
485 | s->d1->shutdown_received | |
486 | && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
487 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
488 | return (0); | |
489 | } | |
490 | #endif | |
491 | return (n); | |
492 | } | |
493 | ||
494 | /* | |
495 | * If we get here, then type != rr->type; if we have a handshake message, | |
496 | * then it was unexpected (Hello Request or Client Hello). | |
497 | */ | |
498 | ||
499 | /* | |
500 | * In case of record types for which we have 'fragment' storage, fill | |
501 | * that so that we can process the data at a fixed place. | |
502 | */ | |
503 | { | |
504 | unsigned int k, dest_maxlen = 0; | |
505 | unsigned char *dest = NULL; | |
506 | unsigned int *dest_len = NULL; | |
507 | ||
747e1639 | 508 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) { |
c661ac16 MC |
509 | dest_maxlen = sizeof s->rlayer.d->handshake_fragment; |
510 | dest = s->rlayer.d->handshake_fragment; | |
511 | dest_len = &s->rlayer.d->handshake_fragment_len; | |
747e1639 | 512 | } else if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) { |
c661ac16 MC |
513 | dest_maxlen = sizeof(s->rlayer.d->alert_fragment); |
514 | dest = s->rlayer.d->alert_fragment; | |
515 | dest_len = &s->rlayer.d->alert_fragment_len; | |
0f113f3e | 516 | } |
4817504d | 517 | #ifndef OPENSSL_NO_HEARTBEATS |
22e3dcb7 | 518 | else if (SSL3_RECORD_get_type(rr) == DTLS1_RT_HEARTBEAT) { |
69f68237 | 519 | /* We allow a 0 return */ |
61986d32 | 520 | if (dtls1_process_heartbeat(s, SSL3_RECORD_get_data(rr), |
a230b26e | 521 | SSL3_RECORD_get_length(rr)) < 0) { |
69f68237 MC |
522 | return -1; |
523 | } | |
0f113f3e | 524 | /* Exit and notify application to read again */ |
747e1639 | 525 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
526 | s->rwstate = SSL_READING; |
527 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
528 | BIO_set_retry_read(SSL_get_rbio(s)); | |
529 | return (-1); | |
530 | } | |
4817504d | 531 | #endif |
0f113f3e | 532 | /* else it's a CCS message, or application data or wrong */ |
747e1639 | 533 | else if (SSL3_RECORD_get_type(rr) != SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
534 | /* |
535 | * Application data while renegotiating is allowed. Try again | |
536 | * reading. | |
537 | */ | |
a230b26e | 538 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA) { |
0f113f3e MC |
539 | BIO *bio; |
540 | s->s3->in_read_app_data = 2; | |
541 | bio = SSL_get_rbio(s); | |
542 | s->rwstate = SSL_READING; | |
543 | BIO_clear_retry_flags(bio); | |
544 | BIO_set_retry_read(bio); | |
545 | return (-1); | |
546 | } | |
547 | ||
548 | /* Not certain if this is the right error handling */ | |
549 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
550 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
551 | goto f_err; | |
552 | } | |
553 | ||
554 | if (dest_maxlen > 0) { | |
555 | /* | |
8483a003 | 556 | * XDTLS: In a pathological case, the Client Hello may be |
0f113f3e MC |
557 | * fragmented--don't always expect dest_maxlen bytes |
558 | */ | |
a230b26e | 559 | if (SSL3_RECORD_get_length(rr) < dest_maxlen) { |
d4938995 | 560 | #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE |
0f113f3e MC |
561 | /* |
562 | * for normal alerts rr->length is 2, while | |
563 | * dest_maxlen is 7 if we were to handle this | |
564 | * non-existing alert... | |
565 | */ | |
a230b26e | 566 | FIX ME; |
d4938995 | 567 | #endif |
747e1639 MC |
568 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
569 | SSL3_RECORD_set_length(rr, 0); | |
0f113f3e MC |
570 | goto start; |
571 | } | |
572 | ||
573 | /* now move 'n' bytes: */ | |
574 | for (k = 0; k < dest_maxlen; k++) { | |
747e1639 MC |
575 | dest[k] = SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]; |
576 | SSL3_RECORD_add_off(rr, 1); | |
577 | SSL3_RECORD_add_length(rr, -1); | |
0f113f3e MC |
578 | } |
579 | *dest_len = dest_maxlen; | |
580 | } | |
581 | } | |
582 | ||
35a1cc90 | 583 | /*- |
c661ac16 MC |
584 | * s->rlayer.d->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE; |
585 | * s->rlayer.d->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT. | |
35a1cc90 MC |
586 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) |
587 | */ | |
0f113f3e MC |
588 | |
589 | /* If we are a client, check for an incoming 'Hello Request': */ | |
590 | if ((!s->server) && | |
c661ac16 MC |
591 | (s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
592 | (s->rlayer.d->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && | |
0f113f3e | 593 | (s->session != NULL) && (s->session->cipher != NULL)) { |
c661ac16 | 594 | s->rlayer.d->handshake_fragment_len = 0; |
0f113f3e | 595 | |
c661ac16 MC |
596 | if ((s->rlayer.d->handshake_fragment[1] != 0) || |
597 | (s->rlayer.d->handshake_fragment[2] != 0) || | |
598 | (s->rlayer.d->handshake_fragment[3] != 0)) { | |
0f113f3e MC |
599 | al = SSL_AD_DECODE_ERROR; |
600 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_HELLO_REQUEST); | |
4dc1aa04 | 601 | goto f_err; |
0f113f3e MC |
602 | } |
603 | ||
604 | /* | |
605 | * no need to check sequence number on HELLO REQUEST messages | |
606 | */ | |
607 | ||
608 | if (s->msg_callback) | |
609 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
c661ac16 | 610 | s->rlayer.d->handshake_fragment, 4, s, |
0f113f3e MC |
611 | s->msg_callback_arg); |
612 | ||
613 | if (SSL_is_init_finished(s) && | |
614 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && | |
615 | !s->s3->renegotiate) { | |
616 | s->d1->handshake_read_seq++; | |
617 | s->new_session = 1; | |
618 | ssl3_renegotiate(s); | |
619 | if (ssl3_renegotiate_check(s)) { | |
620 | i = s->handshake_func(s); | |
621 | if (i < 0) | |
622 | return (i); | |
623 | if (i == 0) { | |
a230b26e | 624 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); |
0f113f3e MC |
625 | return (-1); |
626 | } | |
627 | ||
628 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 629 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 630 | /* no read-ahead left? */ |
0f113f3e MC |
631 | BIO *bio; |
632 | /* | |
633 | * In the case where we try to read application data, | |
634 | * but we trigger an SSL handshake, we return -1 with | |
635 | * the retry option set. Otherwise renegotiation may | |
636 | * cause nasty problems in the blocking world | |
637 | */ | |
638 | s->rwstate = SSL_READING; | |
639 | bio = SSL_get_rbio(s); | |
640 | BIO_clear_retry_flags(bio); | |
641 | BIO_set_retry_read(bio); | |
642 | return (-1); | |
643 | } | |
644 | } | |
645 | } | |
646 | } | |
647 | /* | |
648 | * we either finished a handshake or ignored the request, now try | |
649 | * again to obtain the (application) data we were asked for | |
650 | */ | |
651 | goto start; | |
652 | } | |
653 | ||
c661ac16 MC |
654 | if (s->rlayer.d->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) { |
655 | int alert_level = s->rlayer.d->alert_fragment[0]; | |
656 | int alert_descr = s->rlayer.d->alert_fragment[1]; | |
0f113f3e | 657 | |
c661ac16 | 658 | s->rlayer.d->alert_fragment_len = 0; |
0f113f3e MC |
659 | |
660 | if (s->msg_callback) | |
661 | s->msg_callback(0, s->version, SSL3_RT_ALERT, | |
c661ac16 MC |
662 | s->rlayer.d->alert_fragment, 2, s, |
663 | s->msg_callback_arg); | |
0f113f3e MC |
664 | |
665 | if (s->info_callback != NULL) | |
666 | cb = s->info_callback; | |
667 | else if (s->ctx->info_callback != NULL) | |
668 | cb = s->ctx->info_callback; | |
669 | ||
670 | if (cb != NULL) { | |
671 | j = (alert_level << 8) | alert_descr; | |
672 | cb(s, SSL_CB_READ_ALERT, j); | |
673 | } | |
674 | ||
fd865cad | 675 | if (alert_level == SSL3_AL_WARNING) { |
0f113f3e MC |
676 | s->s3->warn_alert = alert_descr; |
677 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) { | |
7e159e01 | 678 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
679 | /* |
680 | * With SCTP and streams the socket may deliver app data | |
681 | * after a close_notify alert. We have to check this first so | |
682 | * that nothing gets discarded. | |
683 | */ | |
684 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
685 | BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
686 | s->d1->shutdown_received = 1; | |
687 | s->rwstate = SSL_READING; | |
688 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
689 | BIO_set_retry_read(SSL_get_rbio(s)); | |
690 | return -1; | |
691 | } | |
7e159e01 | 692 | #endif |
0f113f3e MC |
693 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; |
694 | return (0); | |
695 | } | |
36d16f8e BL |
696 | #if 0 |
697 | /* XXX: this is a possible improvement in the future */ | |
0f113f3e MC |
698 | /* now check if it's a missing record */ |
699 | if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) { | |
700 | unsigned short seq; | |
701 | unsigned int frag_off; | |
c661ac16 | 702 | unsigned char *p = &(s->rlayer.d->alert_fragment[2]); |
0f113f3e MC |
703 | |
704 | n2s(p, seq); | |
705 | n2l3(p, frag_off); | |
706 | ||
707 | dtls1_retransmit_message(s, | |
708 | dtls1_get_queue_priority | |
709 | (frag->msg_header.seq, 0), frag_off, | |
710 | &found); | |
711 | if (!found && SSL_in_init(s)) { | |
712 | /* | |
713 | * fprintf( stderr,"in init = %d\n", SSL_in_init(s)); | |
714 | */ | |
715 | /* | |
716 | * requested a message not yet sent, send an alert | |
717 | * ourselves | |
718 | */ | |
719 | ssl3_send_alert(s, SSL3_AL_WARNING, | |
720 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); | |
721 | } | |
722 | } | |
36d16f8e | 723 | #endif |
fd865cad | 724 | } else if (alert_level == SSL3_AL_FATAL) { |
0f113f3e MC |
725 | char tmp[16]; |
726 | ||
727 | s->rwstate = SSL_NOTHING; | |
728 | s->s3->fatal_alert = alert_descr; | |
a230b26e | 729 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); |
0f113f3e MC |
730 | BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr); |
731 | ERR_add_error_data(2, "SSL alert number ", tmp); | |
732 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
e2bb9b9b | 733 | SSL_CTX_remove_session(s->session_ctx, s->session); |
0f113f3e MC |
734 | return (0); |
735 | } else { | |
736 | al = SSL_AD_ILLEGAL_PARAMETER; | |
737 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE); | |
738 | goto f_err; | |
739 | } | |
740 | ||
741 | goto start; | |
742 | } | |
743 | ||
744 | if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a | |
745 | * shutdown */ | |
746 | s->rwstate = SSL_NOTHING; | |
747e1639 | 747 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
748 | return (0); |
749 | } | |
750 | ||
747e1639 | 751 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
752 | /* |
753 | * We can't process a CCS now, because previous handshake messages | |
754 | * are still missing, so just drop it. | |
755 | */ | |
c69f2adf | 756 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
757 | goto start; |
758 | } | |
759 | ||
760 | /* | |
761 | * Unexpected handshake message (Client Hello, or protocol violation) | |
762 | */ | |
c661ac16 | 763 | if ((s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
024f543c | 764 | !ossl_statem_get_in_handshake(s)) { |
0f113f3e MC |
765 | struct hm_header_st msg_hdr; |
766 | ||
767 | /* this may just be a stale retransmit */ | |
768 | dtls1_get_message_header(rr->data, &msg_hdr); | |
747e1639 MC |
769 | if (SSL3_RECORD_get_epoch(rr) != s->rlayer.d->r_epoch) { |
770 | SSL3_RECORD_set_length(rr, 0); | |
0f113f3e MC |
771 | goto start; |
772 | } | |
773 | ||
774 | /* | |
775 | * If we are server, we may have a repeated FINISHED of the client | |
776 | * here, then retransmit our CCS and FINISHED. | |
777 | */ | |
778 | if (msg_hdr.type == SSL3_MT_FINISHED) { | |
779 | if (dtls1_check_timeout_num(s) < 0) | |
780 | return -1; | |
781 | ||
17dd65e6 | 782 | dtls1_retransmit_buffered_messages(s); |
747e1639 | 783 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
784 | goto start; |
785 | } | |
786 | ||
49ae7423 | 787 | if (SSL_is_init_finished(s) && |
0f113f3e | 788 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) { |
fe3a3291 | 789 | ossl_statem_set_in_init(s, 1); |
0f113f3e MC |
790 | s->renegotiate = 1; |
791 | s->new_session = 1; | |
792 | } | |
793 | i = s->handshake_func(s); | |
794 | if (i < 0) | |
795 | return (i); | |
796 | if (i == 0) { | |
797 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
798 | return (-1); | |
799 | } | |
800 | ||
801 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 802 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 803 | /* no read-ahead left? */ |
0f113f3e MC |
804 | BIO *bio; |
805 | /* | |
806 | * In the case where we try to read application data, but we | |
807 | * trigger an SSL handshake, we return -1 with the retry | |
808 | * option set. Otherwise renegotiation may cause nasty | |
809 | * problems in the blocking world | |
810 | */ | |
811 | s->rwstate = SSL_READING; | |
812 | bio = SSL_get_rbio(s); | |
813 | BIO_clear_retry_flags(bio); | |
814 | BIO_set_retry_read(bio); | |
815 | return (-1); | |
816 | } | |
817 | } | |
818 | goto start; | |
819 | } | |
820 | ||
747e1639 | 821 | switch (SSL3_RECORD_get_type(rr)) { |
0f113f3e | 822 | default: |
0f113f3e MC |
823 | /* TLS just ignores unknown message types */ |
824 | if (s->version == TLS1_VERSION) { | |
747e1639 | 825 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
826 | goto start; |
827 | } | |
0f113f3e MC |
828 | al = SSL_AD_UNEXPECTED_MESSAGE; |
829 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
830 | goto f_err; | |
831 | case SSL3_RT_CHANGE_CIPHER_SPEC: | |
832 | case SSL3_RT_ALERT: | |
833 | case SSL3_RT_HANDSHAKE: | |
834 | /* | |
835 | * we already handled all of these, with the possible exception of | |
024f543c MC |
836 | * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but |
837 | * that should not happen when type != rr->type | |
0f113f3e MC |
838 | */ |
839 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
840 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
841 | goto f_err; | |
842 | case SSL3_RT_APPLICATION_DATA: | |
843 | /* | |
844 | * At this point, we were expecting handshake data, but have | |
845 | * application data. If the library was running inside ssl3_read() | |
846 | * (i.e. in_read_app_data is set) and it makes sense to read | |
847 | * application data at this point (session renegotiation not yet | |
848 | * started), we will indulge it. | |
849 | */ | |
850 | if (s->s3->in_read_app_data && | |
851 | (s->s3->total_renegotiations != 0) && | |
fe3a3291 | 852 | ossl_statem_app_data_allowed(s)) { |
0f113f3e MC |
853 | s->s3->in_read_app_data = 2; |
854 | return (-1); | |
855 | } else { | |
856 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
857 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
858 | goto f_err; | |
859 | } | |
860 | } | |
861 | /* not reached */ | |
862 | ||
863 | f_err: | |
864 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
0f113f3e MC |
865 | return (-1); |
866 | } | |
867 | ||
0f113f3e MC |
868 | /* |
869 | * this only happens when a client hello is received and a handshake | |
870 | * is started. | |
871 | */ | |
6f7ae319 | 872 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
a773b52a | 873 | int len) |
0f113f3e MC |
874 | { |
875 | ||
c661ac16 | 876 | if ((type == SSL3_RT_HANDSHAKE) |
a230b26e | 877 | && (s->rlayer.d->handshake_fragment_len > 0)) |
0f113f3e MC |
878 | /* (partially) satisfy request from storage */ |
879 | { | |
c661ac16 | 880 | unsigned char *src = s->rlayer.d->handshake_fragment; |
0f113f3e MC |
881 | unsigned char *dst = buf; |
882 | unsigned int k, n; | |
883 | ||
884 | /* peek == 0 */ | |
885 | n = 0; | |
c661ac16 | 886 | while ((len > 0) && (s->rlayer.d->handshake_fragment_len > 0)) { |
0f113f3e MC |
887 | *dst++ = *src++; |
888 | len--; | |
c661ac16 | 889 | s->rlayer.d->handshake_fragment_len--; |
0f113f3e MC |
890 | n++; |
891 | } | |
892 | /* move any remaining fragment bytes: */ | |
c661ac16 MC |
893 | for (k = 0; k < s->rlayer.d->handshake_fragment_len; k++) |
894 | s->rlayer.d->handshake_fragment[k] = *src++; | |
0f113f3e MC |
895 | return n; |
896 | } | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
901 | /* | |
902 | * Call this to write data in records of type 'type' It will return <= 0 if | |
903 | * not all data has been sent or non-blocking IO. | |
36d16f8e | 904 | */ |
480b9e5d | 905 | int dtls1_write_bytes(SSL *s, int type, const void *buf, int len) |
0f113f3e MC |
906 | { |
907 | int i; | |
908 | ||
909 | OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH); | |
910 | s->rwstate = SSL_NOTHING; | |
911 | i = do_dtls1_write(s, type, buf, len, 0); | |
912 | return i; | |
913 | } | |
914 | ||
915 | int do_dtls1_write(SSL *s, int type, const unsigned char *buf, | |
916 | unsigned int len, int create_empty_fragment) | |
917 | { | |
918 | unsigned char *p, *pseq; | |
919 | int i, mac_size, clear = 0; | |
920 | int prefix_len = 0; | |
921 | int eivlen; | |
f482740f | 922 | SSL3_RECORD wr; |
0f113f3e MC |
923 | SSL3_BUFFER *wb; |
924 | SSL_SESSION *sess; | |
925 | ||
d102d9df | 926 | wb = &s->rlayer.wbuf[0]; |
db9a32e7 | 927 | |
0f113f3e MC |
928 | /* |
929 | * first check if there is a SSL3_BUFFER still being written out. This | |
930 | * will happen with non blocking IO | |
931 | */ | |
db9a32e7 | 932 | if (SSL3_BUFFER_get_left(wb) != 0) { |
0f113f3e MC |
933 | OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */ |
934 | return (ssl3_write_pending(s, type, buf, len)); | |
935 | } | |
936 | ||
937 | /* If we have an alert to send, lets send it */ | |
938 | if (s->s3->alert_dispatch) { | |
939 | i = s->method->ssl_dispatch_alert(s); | |
940 | if (i <= 0) | |
941 | return (i); | |
942 | /* if it went, fall through and send more stuff */ | |
943 | } | |
944 | ||
945 | if (len == 0 && !create_empty_fragment) | |
946 | return 0; | |
947 | ||
0f113f3e MC |
948 | sess = s->session; |
949 | ||
950 | if ((sess == NULL) || | |
951 | (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL)) | |
952 | clear = 1; | |
953 | ||
954 | if (clear) | |
955 | mac_size = 0; | |
956 | else { | |
957 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
958 | if (mac_size < 0) | |
959 | goto err; | |
960 | } | |
961 | ||
747e1639 | 962 | p = SSL3_BUFFER_get_buf(wb) + prefix_len; |
0f113f3e MC |
963 | |
964 | /* write the header */ | |
965 | ||
966 | *(p++) = type & 0xff; | |
f482740f | 967 | SSL3_RECORD_set_type(&wr, type); |
0f113f3e MC |
968 | /* |
969 | * Special case: for hello verify request, client version 1.0 and we | |
970 | * haven't decided which version to use yet send back using version 1.0 | |
971 | * header: otherwise some clients will ignore it. | |
972 | */ | |
032924c4 | 973 | if (s->method->version == DTLS_ANY_VERSION && |
a230b26e | 974 | s->max_proto_version != DTLS1_BAD_VER) { |
0f113f3e MC |
975 | *(p++) = DTLS1_VERSION >> 8; |
976 | *(p++) = DTLS1_VERSION & 0xff; | |
977 | } else { | |
978 | *(p++) = s->version >> 8; | |
979 | *(p++) = s->version & 0xff; | |
980 | } | |
981 | ||
982 | /* field where we are to write out packet epoch, seq num and len */ | |
983 | pseq = p; | |
984 | p += 10; | |
985 | ||
986 | /* Explicit IV length, block ciphers appropriate version flag */ | |
987 | if (s->enc_write_ctx) { | |
988 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx); | |
989 | if (mode == EVP_CIPH_CBC_MODE) { | |
990 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx); | |
991 | if (eivlen <= 1) | |
992 | eivlen = 0; | |
993 | } | |
994 | /* Need explicit part of IV for GCM mode */ | |
995 | else if (mode == EVP_CIPH_GCM_MODE) | |
996 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
e75c5a79 DSH |
997 | else if (mode == EVP_CIPH_CCM_MODE) |
998 | eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN; | |
0f113f3e MC |
999 | else |
1000 | eivlen = 0; | |
1001 | } else | |
1002 | eivlen = 0; | |
1003 | ||
1004 | /* lets setup the record stuff. */ | |
f482740f MC |
1005 | SSL3_RECORD_set_data(&wr, p + eivlen); /* make room for IV in case of CBC */ |
1006 | SSL3_RECORD_set_length(&wr, (int)len); | |
1007 | SSL3_RECORD_set_input(&wr, (unsigned char *)buf); | |
0f113f3e MC |
1008 | |
1009 | /* | |
f482740f | 1010 | * we now 'read' from wr.input, wr.length bytes into wr.data |
0f113f3e MC |
1011 | */ |
1012 | ||
1013 | /* first we compress */ | |
1014 | if (s->compress != NULL) { | |
f482740f | 1015 | if (!ssl3_do_compress(s, &wr)) { |
0f113f3e MC |
1016 | SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_COMPRESSION_FAILURE); |
1017 | goto err; | |
1018 | } | |
1019 | } else { | |
f482740f MC |
1020 | memcpy(SSL3_RECORD_get_data(&wr), SSL3_RECORD_get_input(&wr), |
1021 | SSL3_RECORD_get_length(&wr)); | |
1022 | SSL3_RECORD_reset_input(&wr); | |
0f113f3e | 1023 | } |
36d16f8e | 1024 | |
0f113f3e | 1025 | /* |
f482740f MC |
1026 | * we should still have the output to wr.data and the input from |
1027 | * wr.input. Length should be wr.length. wr.data still points in the | |
0f113f3e MC |
1028 | * wb->buf |
1029 | */ | |
36d16f8e | 1030 | |
0f113f3e | 1031 | if (mac_size != 0) { |
f482740f | 1032 | if (s->method->ssl3_enc->mac(s, &wr, |
a230b26e EK |
1033 | &(p[SSL3_RECORD_get_length(&wr) + eivlen]), |
1034 | 1) < 0) | |
0f113f3e | 1035 | goto err; |
f482740f | 1036 | SSL3_RECORD_add_length(&wr, mac_size); |
0f113f3e | 1037 | } |
36d16f8e | 1038 | |
0f113f3e | 1039 | /* this is true regardless of mac size */ |
f482740f MC |
1040 | SSL3_RECORD_set_data(&wr, p); |
1041 | SSL3_RECORD_reset_input(&wr); | |
36d16f8e | 1042 | |
0f113f3e | 1043 | if (eivlen) |
f482740f | 1044 | SSL3_RECORD_add_length(&wr, eivlen); |
36d16f8e | 1045 | |
f482740f | 1046 | if (s->method->ssl3_enc->enc(s, &wr, 1, 1) < 1) |
0f113f3e | 1047 | goto err; |
36d16f8e | 1048 | |
0f113f3e MC |
1049 | /* record length after mac and block padding */ |
1050 | /* | |
1051 | * if (type == SSL3_RT_APPLICATION_DATA || (type == SSL3_RT_ALERT && ! | |
1052 | * SSL_in_init(s))) | |
1053 | */ | |
36d16f8e | 1054 | |
0f113f3e | 1055 | /* there's only one epoch between handshake and app data */ |
36d16f8e | 1056 | |
78a39fe7 | 1057 | s2n(s->rlayer.d->w_epoch, pseq); |
36d16f8e | 1058 | |
0f113f3e MC |
1059 | /* XDTLS: ?? */ |
1060 | /* | |
1061 | * else s2n(s->d1->handshake_epoch, pseq); | |
1062 | */ | |
36d16f8e | 1063 | |
de07f311 | 1064 | memcpy(pseq, &(s->rlayer.write_sequence[2]), 6); |
0f113f3e | 1065 | pseq += 6; |
f482740f | 1066 | s2n(SSL3_RECORD_get_length(&wr), pseq); |
36d16f8e | 1067 | |
0f113f3e MC |
1068 | if (s->msg_callback) |
1069 | s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH, | |
1070 | DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg); | |
36d16f8e | 1071 | |
0f113f3e | 1072 | /* |
f482740f | 1073 | * we should now have wr.data pointing to the encrypted data, which is |
0f113f3e MC |
1074 | * wr->length long |
1075 | */ | |
f482740f MC |
1076 | SSL3_RECORD_set_type(&wr, type); /* not needed but helps for debugging */ |
1077 | SSL3_RECORD_add_length(&wr, DTLS1_RT_HEADER_LENGTH); | |
36d16f8e | 1078 | |
de07f311 | 1079 | ssl3_record_sequence_update(&(s->rlayer.write_sequence[0])); |
36d16f8e | 1080 | |
0f113f3e MC |
1081 | if (create_empty_fragment) { |
1082 | /* | |
1083 | * we are in a recursive call; just return the length, don't write | |
1084 | * out anything here | |
1085 | */ | |
f482740f | 1086 | return wr.length; |
0f113f3e | 1087 | } |
36d16f8e | 1088 | |
0f113f3e | 1089 | /* now let's set up wb */ |
f482740f | 1090 | SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(&wr)); |
747e1639 | 1091 | SSL3_BUFFER_set_offset(wb, 0); |
0f113f3e MC |
1092 | |
1093 | /* | |
1094 | * memorize arguments so that ssl3_write_pending can detect bad write | |
1095 | * retries later | |
1096 | */ | |
f8caa3c8 MC |
1097 | s->rlayer.wpend_tot = len; |
1098 | s->rlayer.wpend_buf = buf; | |
1099 | s->rlayer.wpend_type = type; | |
1100 | s->rlayer.wpend_ret = len; | |
0f113f3e MC |
1101 | |
1102 | /* we now just need to write the buffer */ | |
1103 | return ssl3_write_pending(s, type, buf, len); | |
1104 | err: | |
1105 | return -1; | |
1106 | } | |
36d16f8e | 1107 | |
fe589e61 | 1108 | DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, |
a230b26e | 1109 | unsigned int *is_next_epoch) |
0f113f3e MC |
1110 | { |
1111 | ||
36d16f8e BL |
1112 | *is_next_epoch = 0; |
1113 | ||
1114 | /* In current epoch, accept HM, CCS, DATA, & ALERT */ | |
78a39fe7 | 1115 | if (rr->epoch == s->rlayer.d->r_epoch) |
91f93f69 | 1116 | return &s->rlayer.d->bitmap; |
36d16f8e BL |
1117 | |
1118 | /* Only HM and ALERT messages can be from the next epoch */ | |
78a39fe7 | 1119 | else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) && |
a230b26e | 1120 | (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) { |
36d16f8e | 1121 | *is_next_epoch = 1; |
91f93f69 | 1122 | return &s->rlayer.d->next_bitmap; |
0f113f3e | 1123 | } |
36d16f8e BL |
1124 | |
1125 | return NULL; | |
0f113f3e | 1126 | } |
36d16f8e | 1127 | |
0f113f3e MC |
1128 | void dtls1_reset_seq_numbers(SSL *s, int rw) |
1129 | { | |
1130 | unsigned char *seq; | |
de07f311 | 1131 | unsigned int seq_bytes = sizeof(s->rlayer.read_sequence); |
0f113f3e MC |
1132 | |
1133 | if (rw & SSL3_CC_READ) { | |
de07f311 | 1134 | seq = s->rlayer.read_sequence; |
78a39fe7 | 1135 | s->rlayer.d->r_epoch++; |
16f8d4eb RS |
1136 | memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap, |
1137 | sizeof(s->rlayer.d->bitmap)); | |
a230b26e | 1138 | memset(&s->rlayer.d->next_bitmap, 0, sizeof(s->rlayer.d->next_bitmap)); |
0f113f3e | 1139 | } else { |
de07f311 | 1140 | seq = s->rlayer.write_sequence; |
3bb8f87d | 1141 | memcpy(s->rlayer.d->last_write_sequence, seq, |
de07f311 | 1142 | sizeof(s->rlayer.write_sequence)); |
78a39fe7 | 1143 | s->rlayer.d->w_epoch++; |
0f113f3e MC |
1144 | } |
1145 | ||
16f8d4eb | 1146 | memset(seq, 0, seq_bytes); |
0f113f3e | 1147 | } |