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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; |
738ad946 | 232 | SSL3_BUFFER *rb; |
1fb9fdc3 MC |
233 | SSL3_RECORD *rr; |
234 | DTLS1_BITMAP *bitmap; | |
235 | unsigned int is_next_epoch; | |
236 | int replayok = 1; | |
0f113f3e | 237 | |
cb2ce7ab | 238 | item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q); |
0f113f3e | 239 | if (item) { |
36d16f8e | 240 | /* Check if epoch is current. */ |
cb2ce7ab | 241 | if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch) |
1fb9fdc3 MC |
242 | return 1; /* Nothing to do. */ |
243 | ||
244 | rr = RECORD_LAYER_get_rrec(&s->rlayer); | |
0f113f3e | 245 | |
738ad946 MC |
246 | rb = RECORD_LAYER_get_rbuf(&s->rlayer); |
247 | ||
248 | if (SSL3_BUFFER_get_left(rb) > 0) { | |
249 | /* | |
250 | * We've still got data from the current packet to read. There could | |
251 | * be a record from the new epoch in it - so don't overwrite it | |
252 | * with the unprocessed records yet (we'll do it when we've | |
253 | * finished reading the current packet). | |
254 | */ | |
255 | return 1; | |
256 | } | |
257 | ||
36d16f8e | 258 | /* Process all the records. */ |
cb2ce7ab | 259 | while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) { |
36d16f8e | 260 | dtls1_get_unprocessed_record(s); |
1fb9fdc3 MC |
261 | bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch); |
262 | if (bitmap == NULL) { | |
263 | /* | |
264 | * Should not happen. This will only ever be NULL when the | |
265 | * current record is from a different epoch. But that cannot | |
266 | * be the case because we already checked the epoch above | |
267 | */ | |
268 | SSLerr(SSL_F_DTLS1_PROCESS_BUFFERED_RECORDS, | |
269 | ERR_R_INTERNAL_ERROR); | |
270 | return 0; | |
271 | } | |
272 | #ifndef OPENSSL_NO_SCTP | |
273 | /* Only do replay check if no SCTP bio */ | |
274 | if (!BIO_dgram_is_sctp(SSL_get_rbio(s))) | |
275 | #endif | |
276 | { | |
277 | /* | |
278 | * Check whether this is a repeat, or aged record. We did this | |
279 | * check once already when we first received the record - but | |
280 | * we might have updated the window since then due to | |
281 | * records we subsequently processed. | |
282 | */ | |
283 | replayok = dtls1_record_replay_check(s, bitmap); | |
284 | } | |
285 | ||
286 | if (!replayok || !dtls1_process_record(s, bitmap)) { | |
287 | /* dump this record */ | |
288 | rr->length = 0; | |
289 | RECORD_LAYER_reset_packet_length(&s->rlayer); | |
290 | continue; | |
291 | } | |
292 | ||
cb2ce7ab | 293 | if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds), |
1fb9fdc3 MC |
294 | SSL3_RECORD_get_seq_num(s->rlayer.rrec)) < 0) |
295 | return 0; | |
36d16f8e | 296 | } |
0f113f3e | 297 | } |
36d16f8e | 298 | |
0f113f3e MC |
299 | /* |
300 | * sync epoch numbers once all the unprocessed records have been | |
301 | * processed | |
302 | */ | |
cb2ce7ab MC |
303 | s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch; |
304 | s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1; | |
36d16f8e | 305 | |
1fb9fdc3 | 306 | return 1; |
0f113f3e | 307 | } |
36d16f8e | 308 | |
1d97c843 TH |
309 | /*- |
310 | * Return up to 'len' payload bytes received in 'type' records. | |
36d16f8e BL |
311 | * 'type' is one of the following: |
312 | * | |
313 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
314 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
315 | * - 0 (during a shutdown, no data has to be returned) | |
316 | * | |
317 | * If we don't have stored data to work from, read a SSL/TLS record first | |
318 | * (possibly multiple records if we still don't have anything to return). | |
319 | * | |
320 | * This function must handle any surprises the peer may have for us, such as | |
c69f2adf MC |
321 | * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec |
322 | * messages are treated as if they were handshake messages *if* the |recd_type| | |
323 | * argument is non NULL. | |
36d16f8e BL |
324 | * Also if record payloads contain fragments too small to process, we store |
325 | * them until there is enough for the respective protocol (the record protocol | |
326 | * may use arbitrary fragmentation and even interleaving): | |
327 | * Change cipher spec protocol | |
328 | * just 1 byte needed, no need for keeping anything stored | |
329 | * Alert protocol | |
330 | * 2 bytes needed (AlertLevel, AlertDescription) | |
331 | * Handshake protocol | |
332 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
333 | * to detect unexpected Client Hello and Hello Request messages | |
334 | * here, anything else is handled by higher layers | |
335 | * Application data protocol | |
336 | * none of our business | |
337 | */ | |
657da85e MC |
338 | int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf, |
339 | int len, int peek) | |
0f113f3e MC |
340 | { |
341 | int al, i, j, ret; | |
342 | unsigned int n; | |
343 | SSL3_RECORD *rr; | |
344 | void (*cb) (const SSL *ssl, int type2, int val) = NULL; | |
345 | ||
88c23039 | 346 | if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) { |
28d59af8 | 347 | /* Not initialized yet */ |
0f113f3e MC |
348 | if (!ssl3_setup_buffers(s)) |
349 | return (-1); | |
28d59af8 | 350 | } |
0f113f3e MC |
351 | |
352 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && | |
353 | (type != SSL3_RT_HANDSHAKE)) || | |
354 | (peek && (type != SSL3_RT_APPLICATION_DATA))) { | |
355 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
356 | return -1; | |
357 | } | |
358 | ||
359 | /* | |
360 | * check whether there's a handshake message (client hello?) waiting | |
361 | */ | |
a773b52a | 362 | if ((ret = have_handshake_fragment(s, type, buf, len))) |
0f113f3e MC |
363 | return ret; |
364 | ||
365 | /* | |
c661ac16 MC |
366 | * Now s->rlayer.d->handshake_fragment_len == 0 if |
367 | * type == SSL3_RT_HANDSHAKE. | |
0f113f3e | 368 | */ |
36d16f8e | 369 | |
7e159e01 | 370 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
371 | /* |
372 | * Continue handshake if it had to be interrupted to read app data with | |
373 | * SCTP. | |
374 | */ | |
024f543c | 375 | if ((!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) || |
8723588e | 376 | (BIO_dgram_is_sctp(SSL_get_rbio(s)) |
fe3a3291 | 377 | && ossl_statem_in_sctp_read_sock(s) |
0f113f3e | 378 | && s->s3->in_read_app_data != 2)) |
7e159e01 | 379 | #else |
024f543c | 380 | if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) |
7e159e01 | 381 | #endif |
0f113f3e MC |
382 | { |
383 | /* type == SSL3_RT_APPLICATION_DATA */ | |
384 | i = s->handshake_func(s); | |
385 | if (i < 0) | |
386 | return (i); | |
387 | if (i == 0) { | |
388 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
389 | return (-1); | |
390 | } | |
391 | } | |
392 | ||
393 | start: | |
394 | s->rwstate = SSL_NOTHING; | |
395 | ||
50e735f9 MC |
396 | /*- |
397 | * s->s3->rrec.type - is the type of record | |
398 | * s->s3->rrec.data, - data | |
399 | * s->s3->rrec.off, - offset into 'data' for next read | |
400 | * s->s3->rrec.length, - number of bytes. | |
401 | */ | |
94777c9c | 402 | rr = s->rlayer.rrec; |
0f113f3e MC |
403 | |
404 | /* | |
405 | * We are not handshaking and have no data yet, so process data buffered | |
406 | * during the last handshake in advance, if any. | |
407 | */ | |
49ae7423 | 408 | if (SSL_is_init_finished(s) && SSL3_RECORD_get_length(rr) == 0) { |
0f113f3e | 409 | pitem *item; |
24a1e2f2 | 410 | item = pqueue_pop(s->rlayer.d->buffered_app_data.q); |
0f113f3e | 411 | if (item) { |
7e159e01 | 412 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
413 | /* Restore bio_dgram_sctp_rcvinfo struct */ |
414 | if (BIO_dgram_is_sctp(SSL_get_rbio(s))) { | |
415 | DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data; | |
416 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO, | |
417 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
418 | } | |
7e159e01 DSH |
419 | #endif |
420 | ||
0f113f3e MC |
421 | dtls1_copy_record(s, item); |
422 | ||
423 | OPENSSL_free(item->data); | |
424 | pitem_free(item); | |
425 | } | |
426 | } | |
427 | ||
428 | /* Check for timeout */ | |
429 | if (dtls1_handle_timeout(s) > 0) | |
430 | goto start; | |
431 | ||
432 | /* get new packet if necessary */ | |
747e1639 | 433 | if ((SSL3_RECORD_get_length(rr) == 0) |
a230b26e | 434 | || (s->rlayer.rstate == SSL_ST_READ_BODY)) { |
0f113f3e MC |
435 | ret = dtls1_get_record(s); |
436 | if (ret <= 0) { | |
437 | ret = dtls1_read_failed(s, ret); | |
438 | /* anything other than a timeout is an error */ | |
439 | if (ret <= 0) | |
440 | return (ret); | |
441 | else | |
442 | goto start; | |
443 | } | |
444 | } | |
445 | ||
0f113f3e MC |
446 | /* we now have a packet which can be read and processed */ |
447 | ||
448 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, | |
449 | * reset by ssl3_get_finished */ | |
747e1639 | 450 | && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) { |
0f113f3e MC |
451 | /* |
452 | * We now have application data between CCS and Finished. Most likely | |
453 | * the packets were reordered on their way, so buffer the application | |
454 | * data for later processing rather than dropping the connection. | |
455 | */ | |
24a1e2f2 | 456 | if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data), |
a230b26e | 457 | SSL3_RECORD_get_seq_num(rr)) < 0) { |
0f113f3e MC |
458 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); |
459 | return -1; | |
460 | } | |
747e1639 | 461 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
462 | goto start; |
463 | } | |
464 | ||
465 | /* | |
466 | * If the other end has shut down, throw anything we read away (even in | |
467 | * 'peek' mode) | |
468 | */ | |
469 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) { | |
747e1639 | 470 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
471 | s->rwstate = SSL_NOTHING; |
472 | return (0); | |
473 | } | |
474 | ||
c69f2adf | 475 | if (type == SSL3_RECORD_get_type(rr) |
a230b26e EK |
476 | || (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC |
477 | && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) { | |
c69f2adf MC |
478 | /* |
479 | * SSL3_RT_APPLICATION_DATA or | |
480 | * SSL3_RT_HANDSHAKE or | |
481 | * SSL3_RT_CHANGE_CIPHER_SPEC | |
482 | */ | |
0f113f3e MC |
483 | /* |
484 | * make sure that we are not getting application data when we are | |
485 | * doing a handshake for the first time | |
486 | */ | |
487 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
488 | (s->enc_read_ctx == NULL)) { | |
489 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
490 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE); | |
491 | goto f_err; | |
492 | } | |
7e159e01 | 493 | |
c69f2adf MC |
494 | if (recvd_type != NULL) |
495 | *recvd_type = SSL3_RECORD_get_type(rr); | |
496 | ||
0f113f3e MC |
497 | if (len <= 0) |
498 | return (len); | |
499 | ||
747e1639 MC |
500 | if ((unsigned int)len > SSL3_RECORD_get_length(rr)) |
501 | n = SSL3_RECORD_get_length(rr); | |
0f113f3e MC |
502 | else |
503 | n = (unsigned int)len; | |
504 | ||
747e1639 | 505 | memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n); |
0f113f3e | 506 | if (!peek) { |
753be41d | 507 | SSL3_RECORD_sub_length(rr, n); |
747e1639 MC |
508 | SSL3_RECORD_add_off(rr, n); |
509 | if (SSL3_RECORD_get_length(rr) == 0) { | |
295c3f41 | 510 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
747e1639 | 511 | SSL3_RECORD_set_off(rr, 0); |
0f113f3e MC |
512 | } |
513 | } | |
7e159e01 | 514 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
515 | /* |
516 | * We were about to renegotiate but had to read belated application | |
517 | * data first, so retry. | |
518 | */ | |
519 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
747e1639 | 520 | SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA && |
fe3a3291 | 521 | ossl_statem_in_sctp_read_sock(s)) { |
0f113f3e MC |
522 | s->rwstate = SSL_READING; |
523 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
524 | BIO_set_retry_read(SSL_get_rbio(s)); | |
525 | } | |
526 | ||
527 | /* | |
528 | * We might had to delay a close_notify alert because of reordered | |
529 | * app data. If there was an alert and there is no message to read | |
530 | * anymore, finally set shutdown. | |
531 | */ | |
532 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
533 | s->d1->shutdown_received | |
534 | && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
535 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
536 | return (0); | |
537 | } | |
538 | #endif | |
539 | return (n); | |
540 | } | |
541 | ||
542 | /* | |
543 | * If we get here, then type != rr->type; if we have a handshake message, | |
544 | * then it was unexpected (Hello Request or Client Hello). | |
545 | */ | |
546 | ||
547 | /* | |
548 | * In case of record types for which we have 'fragment' storage, fill | |
549 | * that so that we can process the data at a fixed place. | |
550 | */ | |
551 | { | |
552 | unsigned int k, dest_maxlen = 0; | |
553 | unsigned char *dest = NULL; | |
554 | unsigned int *dest_len = NULL; | |
555 | ||
747e1639 | 556 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) { |
c661ac16 MC |
557 | dest_maxlen = sizeof s->rlayer.d->handshake_fragment; |
558 | dest = s->rlayer.d->handshake_fragment; | |
559 | dest_len = &s->rlayer.d->handshake_fragment_len; | |
747e1639 | 560 | } else if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) { |
c661ac16 MC |
561 | dest_maxlen = sizeof(s->rlayer.d->alert_fragment); |
562 | dest = s->rlayer.d->alert_fragment; | |
563 | dest_len = &s->rlayer.d->alert_fragment_len; | |
0f113f3e | 564 | } |
4817504d | 565 | #ifndef OPENSSL_NO_HEARTBEATS |
22e3dcb7 | 566 | else if (SSL3_RECORD_get_type(rr) == DTLS1_RT_HEARTBEAT) { |
69f68237 | 567 | /* We allow a 0 return */ |
61986d32 | 568 | if (dtls1_process_heartbeat(s, SSL3_RECORD_get_data(rr), |
a230b26e | 569 | SSL3_RECORD_get_length(rr)) < 0) { |
69f68237 MC |
570 | return -1; |
571 | } | |
0f113f3e | 572 | /* Exit and notify application to read again */ |
747e1639 | 573 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
574 | s->rwstate = SSL_READING; |
575 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
576 | BIO_set_retry_read(SSL_get_rbio(s)); | |
577 | return (-1); | |
578 | } | |
4817504d | 579 | #endif |
0f113f3e | 580 | /* else it's a CCS message, or application data or wrong */ |
747e1639 | 581 | else if (SSL3_RECORD_get_type(rr) != SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
582 | /* |
583 | * Application data while renegotiating is allowed. Try again | |
584 | * reading. | |
585 | */ | |
a230b26e | 586 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA) { |
0f113f3e MC |
587 | BIO *bio; |
588 | s->s3->in_read_app_data = 2; | |
589 | bio = SSL_get_rbio(s); | |
590 | s->rwstate = SSL_READING; | |
591 | BIO_clear_retry_flags(bio); | |
592 | BIO_set_retry_read(bio); | |
593 | return (-1); | |
594 | } | |
595 | ||
596 | /* Not certain if this is the right error handling */ | |
597 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
598 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
599 | goto f_err; | |
600 | } | |
601 | ||
602 | if (dest_maxlen > 0) { | |
603 | /* | |
8483a003 | 604 | * XDTLS: In a pathological case, the Client Hello may be |
0f113f3e MC |
605 | * fragmented--don't always expect dest_maxlen bytes |
606 | */ | |
a230b26e | 607 | if (SSL3_RECORD_get_length(rr) < dest_maxlen) { |
d4938995 | 608 | #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE |
0f113f3e MC |
609 | /* |
610 | * for normal alerts rr->length is 2, while | |
611 | * dest_maxlen is 7 if we were to handle this | |
612 | * non-existing alert... | |
613 | */ | |
a230b26e | 614 | FIX ME; |
d4938995 | 615 | #endif |
747e1639 MC |
616 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
617 | SSL3_RECORD_set_length(rr, 0); | |
0f113f3e MC |
618 | goto start; |
619 | } | |
620 | ||
621 | /* now move 'n' bytes: */ | |
622 | for (k = 0; k < dest_maxlen; k++) { | |
747e1639 MC |
623 | dest[k] = SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]; |
624 | SSL3_RECORD_add_off(rr, 1); | |
625 | SSL3_RECORD_add_length(rr, -1); | |
0f113f3e MC |
626 | } |
627 | *dest_len = dest_maxlen; | |
628 | } | |
629 | } | |
630 | ||
35a1cc90 | 631 | /*- |
c661ac16 MC |
632 | * s->rlayer.d->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE; |
633 | * s->rlayer.d->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT. | |
35a1cc90 MC |
634 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) |
635 | */ | |
0f113f3e MC |
636 | |
637 | /* If we are a client, check for an incoming 'Hello Request': */ | |
638 | if ((!s->server) && | |
c661ac16 MC |
639 | (s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
640 | (s->rlayer.d->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && | |
0f113f3e | 641 | (s->session != NULL) && (s->session->cipher != NULL)) { |
c661ac16 | 642 | s->rlayer.d->handshake_fragment_len = 0; |
0f113f3e | 643 | |
c661ac16 MC |
644 | if ((s->rlayer.d->handshake_fragment[1] != 0) || |
645 | (s->rlayer.d->handshake_fragment[2] != 0) || | |
646 | (s->rlayer.d->handshake_fragment[3] != 0)) { | |
0f113f3e MC |
647 | al = SSL_AD_DECODE_ERROR; |
648 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_HELLO_REQUEST); | |
4dc1aa04 | 649 | goto f_err; |
0f113f3e MC |
650 | } |
651 | ||
652 | /* | |
653 | * no need to check sequence number on HELLO REQUEST messages | |
654 | */ | |
655 | ||
656 | if (s->msg_callback) | |
657 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
c661ac16 | 658 | s->rlayer.d->handshake_fragment, 4, s, |
0f113f3e MC |
659 | s->msg_callback_arg); |
660 | ||
661 | if (SSL_is_init_finished(s) && | |
662 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && | |
663 | !s->s3->renegotiate) { | |
664 | s->d1->handshake_read_seq++; | |
665 | s->new_session = 1; | |
666 | ssl3_renegotiate(s); | |
667 | if (ssl3_renegotiate_check(s)) { | |
668 | i = s->handshake_func(s); | |
669 | if (i < 0) | |
670 | return (i); | |
671 | if (i == 0) { | |
a230b26e | 672 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); |
0f113f3e MC |
673 | return (-1); |
674 | } | |
675 | ||
676 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 677 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 678 | /* no read-ahead left? */ |
0f113f3e MC |
679 | BIO *bio; |
680 | /* | |
681 | * In the case where we try to read application data, | |
682 | * but we trigger an SSL handshake, we return -1 with | |
683 | * the retry option set. Otherwise renegotiation may | |
684 | * cause nasty problems in the blocking world | |
685 | */ | |
686 | s->rwstate = SSL_READING; | |
687 | bio = SSL_get_rbio(s); | |
688 | BIO_clear_retry_flags(bio); | |
689 | BIO_set_retry_read(bio); | |
690 | return (-1); | |
691 | } | |
692 | } | |
693 | } | |
694 | } | |
695 | /* | |
696 | * we either finished a handshake or ignored the request, now try | |
697 | * again to obtain the (application) data we were asked for | |
698 | */ | |
699 | goto start; | |
700 | } | |
701 | ||
c661ac16 MC |
702 | if (s->rlayer.d->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) { |
703 | int alert_level = s->rlayer.d->alert_fragment[0]; | |
704 | int alert_descr = s->rlayer.d->alert_fragment[1]; | |
0f113f3e | 705 | |
c661ac16 | 706 | s->rlayer.d->alert_fragment_len = 0; |
0f113f3e MC |
707 | |
708 | if (s->msg_callback) | |
709 | s->msg_callback(0, s->version, SSL3_RT_ALERT, | |
c661ac16 MC |
710 | s->rlayer.d->alert_fragment, 2, s, |
711 | s->msg_callback_arg); | |
0f113f3e MC |
712 | |
713 | if (s->info_callback != NULL) | |
714 | cb = s->info_callback; | |
715 | else if (s->ctx->info_callback != NULL) | |
716 | cb = s->ctx->info_callback; | |
717 | ||
718 | if (cb != NULL) { | |
719 | j = (alert_level << 8) | alert_descr; | |
720 | cb(s, SSL_CB_READ_ALERT, j); | |
721 | } | |
722 | ||
fd865cad | 723 | if (alert_level == SSL3_AL_WARNING) { |
0f113f3e MC |
724 | s->s3->warn_alert = alert_descr; |
725 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) { | |
7e159e01 | 726 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
727 | /* |
728 | * With SCTP and streams the socket may deliver app data | |
729 | * after a close_notify alert. We have to check this first so | |
730 | * that nothing gets discarded. | |
731 | */ | |
732 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
733 | BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
734 | s->d1->shutdown_received = 1; | |
735 | s->rwstate = SSL_READING; | |
736 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
737 | BIO_set_retry_read(SSL_get_rbio(s)); | |
738 | return -1; | |
739 | } | |
7e159e01 | 740 | #endif |
0f113f3e MC |
741 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; |
742 | return (0); | |
743 | } | |
36d16f8e BL |
744 | #if 0 |
745 | /* XXX: this is a possible improvement in the future */ | |
0f113f3e MC |
746 | /* now check if it's a missing record */ |
747 | if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) { | |
748 | unsigned short seq; | |
749 | unsigned int frag_off; | |
c661ac16 | 750 | unsigned char *p = &(s->rlayer.d->alert_fragment[2]); |
0f113f3e MC |
751 | |
752 | n2s(p, seq); | |
753 | n2l3(p, frag_off); | |
754 | ||
755 | dtls1_retransmit_message(s, | |
756 | dtls1_get_queue_priority | |
757 | (frag->msg_header.seq, 0), frag_off, | |
758 | &found); | |
759 | if (!found && SSL_in_init(s)) { | |
760 | /* | |
761 | * fprintf( stderr,"in init = %d\n", SSL_in_init(s)); | |
762 | */ | |
763 | /* | |
764 | * requested a message not yet sent, send an alert | |
765 | * ourselves | |
766 | */ | |
767 | ssl3_send_alert(s, SSL3_AL_WARNING, | |
768 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); | |
769 | } | |
770 | } | |
36d16f8e | 771 | #endif |
fd865cad | 772 | } else if (alert_level == SSL3_AL_FATAL) { |
0f113f3e MC |
773 | char tmp[16]; |
774 | ||
775 | s->rwstate = SSL_NOTHING; | |
776 | s->s3->fatal_alert = alert_descr; | |
a230b26e | 777 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); |
0f113f3e MC |
778 | BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr); |
779 | ERR_add_error_data(2, "SSL alert number ", tmp); | |
780 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
e2bb9b9b | 781 | SSL_CTX_remove_session(s->session_ctx, s->session); |
0f113f3e MC |
782 | return (0); |
783 | } else { | |
784 | al = SSL_AD_ILLEGAL_PARAMETER; | |
785 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE); | |
786 | goto f_err; | |
787 | } | |
788 | ||
789 | goto start; | |
790 | } | |
791 | ||
792 | if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a | |
793 | * shutdown */ | |
794 | s->rwstate = SSL_NOTHING; | |
747e1639 | 795 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
796 | return (0); |
797 | } | |
798 | ||
747e1639 | 799 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
800 | /* |
801 | * We can't process a CCS now, because previous handshake messages | |
802 | * are still missing, so just drop it. | |
803 | */ | |
c69f2adf | 804 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
805 | goto start; |
806 | } | |
807 | ||
808 | /* | |
809 | * Unexpected handshake message (Client Hello, or protocol violation) | |
810 | */ | |
c661ac16 | 811 | if ((s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
024f543c | 812 | !ossl_statem_get_in_handshake(s)) { |
0f113f3e MC |
813 | struct hm_header_st msg_hdr; |
814 | ||
815 | /* this may just be a stale retransmit */ | |
816 | dtls1_get_message_header(rr->data, &msg_hdr); | |
747e1639 MC |
817 | if (SSL3_RECORD_get_epoch(rr) != s->rlayer.d->r_epoch) { |
818 | SSL3_RECORD_set_length(rr, 0); | |
0f113f3e MC |
819 | goto start; |
820 | } | |
821 | ||
822 | /* | |
823 | * If we are server, we may have a repeated FINISHED of the client | |
824 | * here, then retransmit our CCS and FINISHED. | |
825 | */ | |
826 | if (msg_hdr.type == SSL3_MT_FINISHED) { | |
827 | if (dtls1_check_timeout_num(s) < 0) | |
828 | return -1; | |
829 | ||
17dd65e6 | 830 | dtls1_retransmit_buffered_messages(s); |
747e1639 | 831 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
832 | goto start; |
833 | } | |
834 | ||
49ae7423 | 835 | if (SSL_is_init_finished(s) && |
0f113f3e | 836 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) { |
fe3a3291 | 837 | ossl_statem_set_in_init(s, 1); |
0f113f3e MC |
838 | s->renegotiate = 1; |
839 | s->new_session = 1; | |
840 | } | |
841 | i = s->handshake_func(s); | |
842 | if (i < 0) | |
843 | return (i); | |
844 | if (i == 0) { | |
845 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
846 | return (-1); | |
847 | } | |
848 | ||
849 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 850 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 851 | /* no read-ahead left? */ |
0f113f3e MC |
852 | BIO *bio; |
853 | /* | |
854 | * In the case where we try to read application data, but we | |
855 | * trigger an SSL handshake, we return -1 with the retry | |
856 | * option set. Otherwise renegotiation may cause nasty | |
857 | * problems in the blocking world | |
858 | */ | |
859 | s->rwstate = SSL_READING; | |
860 | bio = SSL_get_rbio(s); | |
861 | BIO_clear_retry_flags(bio); | |
862 | BIO_set_retry_read(bio); | |
863 | return (-1); | |
864 | } | |
865 | } | |
866 | goto start; | |
867 | } | |
868 | ||
747e1639 | 869 | switch (SSL3_RECORD_get_type(rr)) { |
0f113f3e | 870 | default: |
0f113f3e MC |
871 | /* TLS just ignores unknown message types */ |
872 | if (s->version == TLS1_VERSION) { | |
747e1639 | 873 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
874 | goto start; |
875 | } | |
0f113f3e MC |
876 | al = SSL_AD_UNEXPECTED_MESSAGE; |
877 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
878 | goto f_err; | |
879 | case SSL3_RT_CHANGE_CIPHER_SPEC: | |
880 | case SSL3_RT_ALERT: | |
881 | case SSL3_RT_HANDSHAKE: | |
882 | /* | |
883 | * we already handled all of these, with the possible exception of | |
024f543c MC |
884 | * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but |
885 | * that should not happen when type != rr->type | |
0f113f3e MC |
886 | */ |
887 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
888 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
889 | goto f_err; | |
890 | case SSL3_RT_APPLICATION_DATA: | |
891 | /* | |
892 | * At this point, we were expecting handshake data, but have | |
893 | * application data. If the library was running inside ssl3_read() | |
894 | * (i.e. in_read_app_data is set) and it makes sense to read | |
895 | * application data at this point (session renegotiation not yet | |
896 | * started), we will indulge it. | |
897 | */ | |
898 | if (s->s3->in_read_app_data && | |
899 | (s->s3->total_renegotiations != 0) && | |
fe3a3291 | 900 | ossl_statem_app_data_allowed(s)) { |
0f113f3e MC |
901 | s->s3->in_read_app_data = 2; |
902 | return (-1); | |
903 | } else { | |
904 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
905 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
906 | goto f_err; | |
907 | } | |
908 | } | |
909 | /* not reached */ | |
910 | ||
911 | f_err: | |
912 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
0f113f3e MC |
913 | return (-1); |
914 | } | |
915 | ||
0f113f3e MC |
916 | /* |
917 | * this only happens when a client hello is received and a handshake | |
918 | * is started. | |
919 | */ | |
6f7ae319 | 920 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
a773b52a | 921 | int len) |
0f113f3e MC |
922 | { |
923 | ||
c661ac16 | 924 | if ((type == SSL3_RT_HANDSHAKE) |
a230b26e | 925 | && (s->rlayer.d->handshake_fragment_len > 0)) |
0f113f3e MC |
926 | /* (partially) satisfy request from storage */ |
927 | { | |
c661ac16 | 928 | unsigned char *src = s->rlayer.d->handshake_fragment; |
0f113f3e MC |
929 | unsigned char *dst = buf; |
930 | unsigned int k, n; | |
931 | ||
932 | /* peek == 0 */ | |
933 | n = 0; | |
c661ac16 | 934 | while ((len > 0) && (s->rlayer.d->handshake_fragment_len > 0)) { |
0f113f3e MC |
935 | *dst++ = *src++; |
936 | len--; | |
c661ac16 | 937 | s->rlayer.d->handshake_fragment_len--; |
0f113f3e MC |
938 | n++; |
939 | } | |
940 | /* move any remaining fragment bytes: */ | |
c661ac16 MC |
941 | for (k = 0; k < s->rlayer.d->handshake_fragment_len; k++) |
942 | s->rlayer.d->handshake_fragment[k] = *src++; | |
0f113f3e MC |
943 | return n; |
944 | } | |
945 | ||
946 | return 0; | |
947 | } | |
948 | ||
949 | /* | |
950 | * Call this to write data in records of type 'type' It will return <= 0 if | |
951 | * not all data has been sent or non-blocking IO. | |
36d16f8e | 952 | */ |
480b9e5d | 953 | int dtls1_write_bytes(SSL *s, int type, const void *buf, int len) |
0f113f3e MC |
954 | { |
955 | int i; | |
956 | ||
957 | OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH); | |
958 | s->rwstate = SSL_NOTHING; | |
959 | i = do_dtls1_write(s, type, buf, len, 0); | |
960 | return i; | |
961 | } | |
962 | ||
963 | int do_dtls1_write(SSL *s, int type, const unsigned char *buf, | |
964 | unsigned int len, int create_empty_fragment) | |
965 | { | |
966 | unsigned char *p, *pseq; | |
967 | int i, mac_size, clear = 0; | |
968 | int prefix_len = 0; | |
969 | int eivlen; | |
f482740f | 970 | SSL3_RECORD wr; |
0f113f3e MC |
971 | SSL3_BUFFER *wb; |
972 | SSL_SESSION *sess; | |
973 | ||
d102d9df | 974 | wb = &s->rlayer.wbuf[0]; |
db9a32e7 | 975 | |
0f113f3e MC |
976 | /* |
977 | * first check if there is a SSL3_BUFFER still being written out. This | |
978 | * will happen with non blocking IO | |
979 | */ | |
db9a32e7 | 980 | if (SSL3_BUFFER_get_left(wb) != 0) { |
0f113f3e MC |
981 | OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */ |
982 | return (ssl3_write_pending(s, type, buf, len)); | |
983 | } | |
984 | ||
985 | /* If we have an alert to send, lets send it */ | |
986 | if (s->s3->alert_dispatch) { | |
987 | i = s->method->ssl_dispatch_alert(s); | |
988 | if (i <= 0) | |
989 | return (i); | |
990 | /* if it went, fall through and send more stuff */ | |
991 | } | |
992 | ||
993 | if (len == 0 && !create_empty_fragment) | |
994 | return 0; | |
995 | ||
0f113f3e MC |
996 | sess = s->session; |
997 | ||
998 | if ((sess == NULL) || | |
999 | (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL)) | |
1000 | clear = 1; | |
1001 | ||
1002 | if (clear) | |
1003 | mac_size = 0; | |
1004 | else { | |
1005 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
1006 | if (mac_size < 0) | |
1007 | goto err; | |
1008 | } | |
1009 | ||
747e1639 | 1010 | p = SSL3_BUFFER_get_buf(wb) + prefix_len; |
0f113f3e MC |
1011 | |
1012 | /* write the header */ | |
1013 | ||
1014 | *(p++) = type & 0xff; | |
f482740f | 1015 | SSL3_RECORD_set_type(&wr, type); |
0f113f3e MC |
1016 | /* |
1017 | * Special case: for hello verify request, client version 1.0 and we | |
1018 | * haven't decided which version to use yet send back using version 1.0 | |
1019 | * header: otherwise some clients will ignore it. | |
1020 | */ | |
032924c4 | 1021 | if (s->method->version == DTLS_ANY_VERSION && |
a230b26e | 1022 | s->max_proto_version != DTLS1_BAD_VER) { |
0f113f3e MC |
1023 | *(p++) = DTLS1_VERSION >> 8; |
1024 | *(p++) = DTLS1_VERSION & 0xff; | |
1025 | } else { | |
1026 | *(p++) = s->version >> 8; | |
1027 | *(p++) = s->version & 0xff; | |
1028 | } | |
1029 | ||
1030 | /* field where we are to write out packet epoch, seq num and len */ | |
1031 | pseq = p; | |
1032 | p += 10; | |
1033 | ||
1034 | /* Explicit IV length, block ciphers appropriate version flag */ | |
1035 | if (s->enc_write_ctx) { | |
1036 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx); | |
1037 | if (mode == EVP_CIPH_CBC_MODE) { | |
1038 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx); | |
1039 | if (eivlen <= 1) | |
1040 | eivlen = 0; | |
1041 | } | |
1042 | /* Need explicit part of IV for GCM mode */ | |
1043 | else if (mode == EVP_CIPH_GCM_MODE) | |
1044 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
e75c5a79 DSH |
1045 | else if (mode == EVP_CIPH_CCM_MODE) |
1046 | eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN; | |
0f113f3e MC |
1047 | else |
1048 | eivlen = 0; | |
1049 | } else | |
1050 | eivlen = 0; | |
1051 | ||
1052 | /* lets setup the record stuff. */ | |
f482740f MC |
1053 | SSL3_RECORD_set_data(&wr, p + eivlen); /* make room for IV in case of CBC */ |
1054 | SSL3_RECORD_set_length(&wr, (int)len); | |
1055 | SSL3_RECORD_set_input(&wr, (unsigned char *)buf); | |
0f113f3e MC |
1056 | |
1057 | /* | |
f482740f | 1058 | * we now 'read' from wr.input, wr.length bytes into wr.data |
0f113f3e MC |
1059 | */ |
1060 | ||
1061 | /* first we compress */ | |
1062 | if (s->compress != NULL) { | |
f482740f | 1063 | if (!ssl3_do_compress(s, &wr)) { |
0f113f3e MC |
1064 | SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_COMPRESSION_FAILURE); |
1065 | goto err; | |
1066 | } | |
1067 | } else { | |
f482740f MC |
1068 | memcpy(SSL3_RECORD_get_data(&wr), SSL3_RECORD_get_input(&wr), |
1069 | SSL3_RECORD_get_length(&wr)); | |
1070 | SSL3_RECORD_reset_input(&wr); | |
0f113f3e | 1071 | } |
36d16f8e | 1072 | |
0f113f3e | 1073 | /* |
f482740f MC |
1074 | * we should still have the output to wr.data and the input from |
1075 | * wr.input. Length should be wr.length. wr.data still points in the | |
0f113f3e MC |
1076 | * wb->buf |
1077 | */ | |
36d16f8e | 1078 | |
0f113f3e | 1079 | if (mac_size != 0) { |
f482740f | 1080 | if (s->method->ssl3_enc->mac(s, &wr, |
a230b26e EK |
1081 | &(p[SSL3_RECORD_get_length(&wr) + eivlen]), |
1082 | 1) < 0) | |
0f113f3e | 1083 | goto err; |
f482740f | 1084 | SSL3_RECORD_add_length(&wr, mac_size); |
0f113f3e | 1085 | } |
36d16f8e | 1086 | |
0f113f3e | 1087 | /* this is true regardless of mac size */ |
f482740f MC |
1088 | SSL3_RECORD_set_data(&wr, p); |
1089 | SSL3_RECORD_reset_input(&wr); | |
36d16f8e | 1090 | |
0f113f3e | 1091 | if (eivlen) |
f482740f | 1092 | SSL3_RECORD_add_length(&wr, eivlen); |
36d16f8e | 1093 | |
f482740f | 1094 | if (s->method->ssl3_enc->enc(s, &wr, 1, 1) < 1) |
0f113f3e | 1095 | goto err; |
36d16f8e | 1096 | |
0f113f3e MC |
1097 | /* record length after mac and block padding */ |
1098 | /* | |
1099 | * if (type == SSL3_RT_APPLICATION_DATA || (type == SSL3_RT_ALERT && ! | |
1100 | * SSL_in_init(s))) | |
1101 | */ | |
36d16f8e | 1102 | |
0f113f3e | 1103 | /* there's only one epoch between handshake and app data */ |
36d16f8e | 1104 | |
78a39fe7 | 1105 | s2n(s->rlayer.d->w_epoch, pseq); |
36d16f8e | 1106 | |
0f113f3e MC |
1107 | /* XDTLS: ?? */ |
1108 | /* | |
1109 | * else s2n(s->d1->handshake_epoch, pseq); | |
1110 | */ | |
36d16f8e | 1111 | |
de07f311 | 1112 | memcpy(pseq, &(s->rlayer.write_sequence[2]), 6); |
0f113f3e | 1113 | pseq += 6; |
f482740f | 1114 | s2n(SSL3_RECORD_get_length(&wr), pseq); |
36d16f8e | 1115 | |
0f113f3e MC |
1116 | if (s->msg_callback) |
1117 | s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH, | |
1118 | DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg); | |
36d16f8e | 1119 | |
0f113f3e | 1120 | /* |
f482740f | 1121 | * we should now have wr.data pointing to the encrypted data, which is |
0f113f3e MC |
1122 | * wr->length long |
1123 | */ | |
f482740f MC |
1124 | SSL3_RECORD_set_type(&wr, type); /* not needed but helps for debugging */ |
1125 | SSL3_RECORD_add_length(&wr, DTLS1_RT_HEADER_LENGTH); | |
36d16f8e | 1126 | |
de07f311 | 1127 | ssl3_record_sequence_update(&(s->rlayer.write_sequence[0])); |
36d16f8e | 1128 | |
0f113f3e MC |
1129 | if (create_empty_fragment) { |
1130 | /* | |
1131 | * we are in a recursive call; just return the length, don't write | |
1132 | * out anything here | |
1133 | */ | |
f482740f | 1134 | return wr.length; |
0f113f3e | 1135 | } |
36d16f8e | 1136 | |
0f113f3e | 1137 | /* now let's set up wb */ |
f482740f | 1138 | SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(&wr)); |
747e1639 | 1139 | SSL3_BUFFER_set_offset(wb, 0); |
0f113f3e MC |
1140 | |
1141 | /* | |
1142 | * memorize arguments so that ssl3_write_pending can detect bad write | |
1143 | * retries later | |
1144 | */ | |
f8caa3c8 MC |
1145 | s->rlayer.wpend_tot = len; |
1146 | s->rlayer.wpend_buf = buf; | |
1147 | s->rlayer.wpend_type = type; | |
1148 | s->rlayer.wpend_ret = len; | |
0f113f3e MC |
1149 | |
1150 | /* we now just need to write the buffer */ | |
1151 | return ssl3_write_pending(s, type, buf, len); | |
1152 | err: | |
1153 | return -1; | |
1154 | } | |
36d16f8e | 1155 | |
fe589e61 | 1156 | DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, |
a230b26e | 1157 | unsigned int *is_next_epoch) |
0f113f3e MC |
1158 | { |
1159 | ||
36d16f8e BL |
1160 | *is_next_epoch = 0; |
1161 | ||
1162 | /* In current epoch, accept HM, CCS, DATA, & ALERT */ | |
78a39fe7 | 1163 | if (rr->epoch == s->rlayer.d->r_epoch) |
91f93f69 | 1164 | return &s->rlayer.d->bitmap; |
36d16f8e | 1165 | |
738ad946 MC |
1166 | /* |
1167 | * Only HM and ALERT messages can be from the next epoch and only if we | |
1168 | * have already processed all of the unprocessed records from the last | |
1169 | * epoch | |
1170 | */ | |
78a39fe7 | 1171 | else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) && |
738ad946 | 1172 | s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch && |
a230b26e | 1173 | (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) { |
36d16f8e | 1174 | *is_next_epoch = 1; |
91f93f69 | 1175 | return &s->rlayer.d->next_bitmap; |
0f113f3e | 1176 | } |
36d16f8e BL |
1177 | |
1178 | return NULL; | |
0f113f3e | 1179 | } |
36d16f8e | 1180 | |
0f113f3e MC |
1181 | void dtls1_reset_seq_numbers(SSL *s, int rw) |
1182 | { | |
1183 | unsigned char *seq; | |
de07f311 | 1184 | unsigned int seq_bytes = sizeof(s->rlayer.read_sequence); |
0f113f3e MC |
1185 | |
1186 | if (rw & SSL3_CC_READ) { | |
de07f311 | 1187 | seq = s->rlayer.read_sequence; |
78a39fe7 | 1188 | s->rlayer.d->r_epoch++; |
16f8d4eb RS |
1189 | memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap, |
1190 | sizeof(s->rlayer.d->bitmap)); | |
a230b26e | 1191 | memset(&s->rlayer.d->next_bitmap, 0, sizeof(s->rlayer.d->next_bitmap)); |
0f113f3e | 1192 | } else { |
de07f311 | 1193 | seq = s->rlayer.write_sequence; |
3bb8f87d | 1194 | memcpy(s->rlayer.d->last_write_sequence, seq, |
de07f311 | 1195 | sizeof(s->rlayer.write_sequence)); |
78a39fe7 | 1196 | s->rlayer.d->w_epoch++; |
0f113f3e MC |
1197 | } |
1198 | ||
16f8d4eb | 1199 | memset(seq, 0, seq_bytes); |
0f113f3e | 1200 | } |