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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; |
0f113f3e | 233 | |
cb2ce7ab | 234 | item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q); |
0f113f3e | 235 | if (item) { |
36d16f8e | 236 | /* Check if epoch is current. */ |
cb2ce7ab | 237 | if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch) |
0f113f3e MC |
238 | return (1); /* Nothing to do. */ |
239 | ||
738ad946 MC |
240 | rb = RECORD_LAYER_get_rbuf(&s->rlayer); |
241 | ||
242 | if (SSL3_BUFFER_get_left(rb) > 0) { | |
243 | /* | |
244 | * We've still got data from the current packet to read. There could | |
245 | * be a record from the new epoch in it - so don't overwrite it | |
246 | * with the unprocessed records yet (we'll do it when we've | |
247 | * finished reading the current packet). | |
248 | */ | |
249 | return 1; | |
250 | } | |
251 | ||
36d16f8e | 252 | /* Process all the records. */ |
cb2ce7ab | 253 | while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) { |
36d16f8e | 254 | dtls1_get_unprocessed_record(s); |
0f113f3e MC |
255 | if (!dtls1_process_record(s)) |
256 | return (0); | |
cb2ce7ab | 257 | if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds), |
a230b26e EK |
258 | SSL3_RECORD_get_seq_num(s->rlayer.rrec)) < |
259 | 0) | |
103b171d | 260 | return -1; |
36d16f8e | 261 | } |
0f113f3e | 262 | } |
36d16f8e | 263 | |
0f113f3e MC |
264 | /* |
265 | * sync epoch numbers once all the unprocessed records have been | |
266 | * processed | |
267 | */ | |
cb2ce7ab MC |
268 | s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch; |
269 | s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1; | |
36d16f8e | 270 | |
0f113f3e MC |
271 | return (1); |
272 | } | |
36d16f8e | 273 | |
1d97c843 TH |
274 | /*- |
275 | * Return up to 'len' payload bytes received in 'type' records. | |
36d16f8e BL |
276 | * 'type' is one of the following: |
277 | * | |
278 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
279 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
280 | * - 0 (during a shutdown, no data has to be returned) | |
281 | * | |
282 | * If we don't have stored data to work from, read a SSL/TLS record first | |
283 | * (possibly multiple records if we still don't have anything to return). | |
284 | * | |
285 | * This function must handle any surprises the peer may have for us, such as | |
c69f2adf MC |
286 | * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec |
287 | * messages are treated as if they were handshake messages *if* the |recd_type| | |
288 | * argument is non NULL. | |
36d16f8e BL |
289 | * Also if record payloads contain fragments too small to process, we store |
290 | * them until there is enough for the respective protocol (the record protocol | |
291 | * may use arbitrary fragmentation and even interleaving): | |
292 | * Change cipher spec protocol | |
293 | * just 1 byte needed, no need for keeping anything stored | |
294 | * Alert protocol | |
295 | * 2 bytes needed (AlertLevel, AlertDescription) | |
296 | * Handshake protocol | |
297 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
298 | * to detect unexpected Client Hello and Hello Request messages | |
299 | * here, anything else is handled by higher layers | |
300 | * Application data protocol | |
301 | * none of our business | |
302 | */ | |
657da85e MC |
303 | int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf, |
304 | int len, int peek) | |
0f113f3e MC |
305 | { |
306 | int al, i, j, ret; | |
307 | unsigned int n; | |
308 | SSL3_RECORD *rr; | |
309 | void (*cb) (const SSL *ssl, int type2, int val) = NULL; | |
310 | ||
88c23039 | 311 | if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) { |
28d59af8 | 312 | /* Not initialized yet */ |
0f113f3e MC |
313 | if (!ssl3_setup_buffers(s)) |
314 | return (-1); | |
28d59af8 | 315 | } |
0f113f3e MC |
316 | |
317 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && | |
318 | (type != SSL3_RT_HANDSHAKE)) || | |
319 | (peek && (type != SSL3_RT_APPLICATION_DATA))) { | |
320 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
321 | return -1; | |
322 | } | |
323 | ||
324 | /* | |
325 | * check whether there's a handshake message (client hello?) waiting | |
326 | */ | |
a773b52a | 327 | if ((ret = have_handshake_fragment(s, type, buf, len))) |
0f113f3e MC |
328 | return ret; |
329 | ||
330 | /* | |
c661ac16 MC |
331 | * Now s->rlayer.d->handshake_fragment_len == 0 if |
332 | * type == SSL3_RT_HANDSHAKE. | |
0f113f3e | 333 | */ |
36d16f8e | 334 | |
7e159e01 | 335 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
336 | /* |
337 | * Continue handshake if it had to be interrupted to read app data with | |
338 | * SCTP. | |
339 | */ | |
024f543c | 340 | if ((!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) || |
8723588e | 341 | (BIO_dgram_is_sctp(SSL_get_rbio(s)) |
fe3a3291 | 342 | && ossl_statem_in_sctp_read_sock(s) |
0f113f3e | 343 | && s->s3->in_read_app_data != 2)) |
7e159e01 | 344 | #else |
024f543c | 345 | if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) |
7e159e01 | 346 | #endif |
0f113f3e MC |
347 | { |
348 | /* type == SSL3_RT_APPLICATION_DATA */ | |
349 | i = s->handshake_func(s); | |
350 | if (i < 0) | |
351 | return (i); | |
352 | if (i == 0) { | |
353 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
354 | return (-1); | |
355 | } | |
356 | } | |
357 | ||
358 | start: | |
359 | s->rwstate = SSL_NOTHING; | |
360 | ||
50e735f9 MC |
361 | /*- |
362 | * s->s3->rrec.type - is the type of record | |
363 | * s->s3->rrec.data, - data | |
364 | * s->s3->rrec.off, - offset into 'data' for next read | |
365 | * s->s3->rrec.length, - number of bytes. | |
366 | */ | |
94777c9c | 367 | rr = s->rlayer.rrec; |
0f113f3e MC |
368 | |
369 | /* | |
370 | * We are not handshaking and have no data yet, so process data buffered | |
371 | * during the last handshake in advance, if any. | |
372 | */ | |
49ae7423 | 373 | if (SSL_is_init_finished(s) && SSL3_RECORD_get_length(rr) == 0) { |
0f113f3e | 374 | pitem *item; |
24a1e2f2 | 375 | item = pqueue_pop(s->rlayer.d->buffered_app_data.q); |
0f113f3e | 376 | if (item) { |
7e159e01 | 377 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
378 | /* Restore bio_dgram_sctp_rcvinfo struct */ |
379 | if (BIO_dgram_is_sctp(SSL_get_rbio(s))) { | |
380 | DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data; | |
381 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO, | |
382 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
383 | } | |
7e159e01 DSH |
384 | #endif |
385 | ||
0f113f3e MC |
386 | dtls1_copy_record(s, item); |
387 | ||
388 | OPENSSL_free(item->data); | |
389 | pitem_free(item); | |
390 | } | |
391 | } | |
392 | ||
393 | /* Check for timeout */ | |
394 | if (dtls1_handle_timeout(s) > 0) | |
395 | goto start; | |
396 | ||
397 | /* get new packet if necessary */ | |
747e1639 | 398 | if ((SSL3_RECORD_get_length(rr) == 0) |
a230b26e | 399 | || (s->rlayer.rstate == SSL_ST_READ_BODY)) { |
0f113f3e MC |
400 | ret = dtls1_get_record(s); |
401 | if (ret <= 0) { | |
402 | ret = dtls1_read_failed(s, ret); | |
403 | /* anything other than a timeout is an error */ | |
404 | if (ret <= 0) | |
405 | return (ret); | |
406 | else | |
407 | goto start; | |
408 | } | |
409 | } | |
410 | ||
0f113f3e MC |
411 | /* we now have a packet which can be read and processed */ |
412 | ||
413 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, | |
414 | * reset by ssl3_get_finished */ | |
747e1639 | 415 | && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) { |
0f113f3e MC |
416 | /* |
417 | * We now have application data between CCS and Finished. Most likely | |
418 | * the packets were reordered on their way, so buffer the application | |
419 | * data for later processing rather than dropping the connection. | |
420 | */ | |
24a1e2f2 | 421 | if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data), |
a230b26e | 422 | SSL3_RECORD_get_seq_num(rr)) < 0) { |
0f113f3e MC |
423 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); |
424 | return -1; | |
425 | } | |
747e1639 | 426 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
427 | goto start; |
428 | } | |
429 | ||
430 | /* | |
431 | * If the other end has shut down, throw anything we read away (even in | |
432 | * 'peek' mode) | |
433 | */ | |
434 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) { | |
747e1639 | 435 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
436 | s->rwstate = SSL_NOTHING; |
437 | return (0); | |
438 | } | |
439 | ||
c69f2adf | 440 | if (type == SSL3_RECORD_get_type(rr) |
a230b26e EK |
441 | || (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC |
442 | && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) { | |
c69f2adf MC |
443 | /* |
444 | * SSL3_RT_APPLICATION_DATA or | |
445 | * SSL3_RT_HANDSHAKE or | |
446 | * SSL3_RT_CHANGE_CIPHER_SPEC | |
447 | */ | |
0f113f3e MC |
448 | /* |
449 | * make sure that we are not getting application data when we are | |
450 | * doing a handshake for the first time | |
451 | */ | |
452 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
453 | (s->enc_read_ctx == NULL)) { | |
454 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
455 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE); | |
456 | goto f_err; | |
457 | } | |
7e159e01 | 458 | |
c69f2adf MC |
459 | if (recvd_type != NULL) |
460 | *recvd_type = SSL3_RECORD_get_type(rr); | |
461 | ||
0f113f3e MC |
462 | if (len <= 0) |
463 | return (len); | |
464 | ||
747e1639 MC |
465 | if ((unsigned int)len > SSL3_RECORD_get_length(rr)) |
466 | n = SSL3_RECORD_get_length(rr); | |
0f113f3e MC |
467 | else |
468 | n = (unsigned int)len; | |
469 | ||
747e1639 | 470 | memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n); |
0f113f3e | 471 | if (!peek) { |
753be41d | 472 | SSL3_RECORD_sub_length(rr, n); |
747e1639 MC |
473 | SSL3_RECORD_add_off(rr, n); |
474 | if (SSL3_RECORD_get_length(rr) == 0) { | |
295c3f41 | 475 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
747e1639 | 476 | SSL3_RECORD_set_off(rr, 0); |
0f113f3e MC |
477 | } |
478 | } | |
7e159e01 | 479 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
480 | /* |
481 | * We were about to renegotiate but had to read belated application | |
482 | * data first, so retry. | |
483 | */ | |
484 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
747e1639 | 485 | SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA && |
fe3a3291 | 486 | ossl_statem_in_sctp_read_sock(s)) { |
0f113f3e MC |
487 | s->rwstate = SSL_READING; |
488 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
489 | BIO_set_retry_read(SSL_get_rbio(s)); | |
490 | } | |
491 | ||
492 | /* | |
493 | * We might had to delay a close_notify alert because of reordered | |
494 | * app data. If there was an alert and there is no message to read | |
495 | * anymore, finally set shutdown. | |
496 | */ | |
497 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
498 | s->d1->shutdown_received | |
499 | && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
500 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
501 | return (0); | |
502 | } | |
503 | #endif | |
504 | return (n); | |
505 | } | |
506 | ||
507 | /* | |
508 | * If we get here, then type != rr->type; if we have a handshake message, | |
509 | * then it was unexpected (Hello Request or Client Hello). | |
510 | */ | |
511 | ||
512 | /* | |
513 | * In case of record types for which we have 'fragment' storage, fill | |
514 | * that so that we can process the data at a fixed place. | |
515 | */ | |
516 | { | |
517 | unsigned int k, dest_maxlen = 0; | |
518 | unsigned char *dest = NULL; | |
519 | unsigned int *dest_len = NULL; | |
520 | ||
747e1639 | 521 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) { |
c661ac16 MC |
522 | dest_maxlen = sizeof s->rlayer.d->handshake_fragment; |
523 | dest = s->rlayer.d->handshake_fragment; | |
524 | dest_len = &s->rlayer.d->handshake_fragment_len; | |
747e1639 | 525 | } else if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) { |
c661ac16 MC |
526 | dest_maxlen = sizeof(s->rlayer.d->alert_fragment); |
527 | dest = s->rlayer.d->alert_fragment; | |
528 | dest_len = &s->rlayer.d->alert_fragment_len; | |
0f113f3e | 529 | } |
4817504d | 530 | #ifndef OPENSSL_NO_HEARTBEATS |
22e3dcb7 | 531 | else if (SSL3_RECORD_get_type(rr) == DTLS1_RT_HEARTBEAT) { |
69f68237 | 532 | /* We allow a 0 return */ |
61986d32 | 533 | if (dtls1_process_heartbeat(s, SSL3_RECORD_get_data(rr), |
a230b26e | 534 | SSL3_RECORD_get_length(rr)) < 0) { |
69f68237 MC |
535 | return -1; |
536 | } | |
0f113f3e | 537 | /* Exit and notify application to read again */ |
747e1639 | 538 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
539 | s->rwstate = SSL_READING; |
540 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
541 | BIO_set_retry_read(SSL_get_rbio(s)); | |
542 | return (-1); | |
543 | } | |
4817504d | 544 | #endif |
0f113f3e | 545 | /* else it's a CCS message, or application data or wrong */ |
747e1639 | 546 | else if (SSL3_RECORD_get_type(rr) != SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
547 | /* |
548 | * Application data while renegotiating is allowed. Try again | |
549 | * reading. | |
550 | */ | |
a230b26e | 551 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_APPLICATION_DATA) { |
0f113f3e MC |
552 | BIO *bio; |
553 | s->s3->in_read_app_data = 2; | |
554 | bio = SSL_get_rbio(s); | |
555 | s->rwstate = SSL_READING; | |
556 | BIO_clear_retry_flags(bio); | |
557 | BIO_set_retry_read(bio); | |
558 | return (-1); | |
559 | } | |
560 | ||
561 | /* Not certain if this is the right error handling */ | |
562 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
563 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
564 | goto f_err; | |
565 | } | |
566 | ||
567 | if (dest_maxlen > 0) { | |
568 | /* | |
8483a003 | 569 | * XDTLS: In a pathological case, the Client Hello may be |
0f113f3e MC |
570 | * fragmented--don't always expect dest_maxlen bytes |
571 | */ | |
a230b26e | 572 | if (SSL3_RECORD_get_length(rr) < dest_maxlen) { |
d4938995 | 573 | #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE |
0f113f3e MC |
574 | /* |
575 | * for normal alerts rr->length is 2, while | |
576 | * dest_maxlen is 7 if we were to handle this | |
577 | * non-existing alert... | |
578 | */ | |
a230b26e | 579 | FIX ME; |
d4938995 | 580 | #endif |
747e1639 MC |
581 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
582 | SSL3_RECORD_set_length(rr, 0); | |
0f113f3e MC |
583 | goto start; |
584 | } | |
585 | ||
586 | /* now move 'n' bytes: */ | |
587 | for (k = 0; k < dest_maxlen; k++) { | |
747e1639 MC |
588 | dest[k] = SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]; |
589 | SSL3_RECORD_add_off(rr, 1); | |
590 | SSL3_RECORD_add_length(rr, -1); | |
0f113f3e MC |
591 | } |
592 | *dest_len = dest_maxlen; | |
593 | } | |
594 | } | |
595 | ||
35a1cc90 | 596 | /*- |
c661ac16 MC |
597 | * s->rlayer.d->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE; |
598 | * s->rlayer.d->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT. | |
35a1cc90 MC |
599 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) |
600 | */ | |
0f113f3e MC |
601 | |
602 | /* If we are a client, check for an incoming 'Hello Request': */ | |
603 | if ((!s->server) && | |
c661ac16 MC |
604 | (s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
605 | (s->rlayer.d->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && | |
0f113f3e | 606 | (s->session != NULL) && (s->session->cipher != NULL)) { |
c661ac16 | 607 | s->rlayer.d->handshake_fragment_len = 0; |
0f113f3e | 608 | |
c661ac16 MC |
609 | if ((s->rlayer.d->handshake_fragment[1] != 0) || |
610 | (s->rlayer.d->handshake_fragment[2] != 0) || | |
611 | (s->rlayer.d->handshake_fragment[3] != 0)) { | |
0f113f3e MC |
612 | al = SSL_AD_DECODE_ERROR; |
613 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_HELLO_REQUEST); | |
4dc1aa04 | 614 | goto f_err; |
0f113f3e MC |
615 | } |
616 | ||
617 | /* | |
618 | * no need to check sequence number on HELLO REQUEST messages | |
619 | */ | |
620 | ||
621 | if (s->msg_callback) | |
622 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
c661ac16 | 623 | s->rlayer.d->handshake_fragment, 4, s, |
0f113f3e MC |
624 | s->msg_callback_arg); |
625 | ||
626 | if (SSL_is_init_finished(s) && | |
627 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && | |
628 | !s->s3->renegotiate) { | |
629 | s->d1->handshake_read_seq++; | |
630 | s->new_session = 1; | |
631 | ssl3_renegotiate(s); | |
632 | if (ssl3_renegotiate_check(s)) { | |
633 | i = s->handshake_func(s); | |
634 | if (i < 0) | |
635 | return (i); | |
636 | if (i == 0) { | |
a230b26e | 637 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); |
0f113f3e MC |
638 | return (-1); |
639 | } | |
640 | ||
641 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 642 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 643 | /* no read-ahead left? */ |
0f113f3e MC |
644 | BIO *bio; |
645 | /* | |
646 | * In the case where we try to read application data, | |
647 | * but we trigger an SSL handshake, we return -1 with | |
648 | * the retry option set. Otherwise renegotiation may | |
649 | * cause nasty problems in the blocking world | |
650 | */ | |
651 | s->rwstate = SSL_READING; | |
652 | bio = SSL_get_rbio(s); | |
653 | BIO_clear_retry_flags(bio); | |
654 | BIO_set_retry_read(bio); | |
655 | return (-1); | |
656 | } | |
657 | } | |
658 | } | |
659 | } | |
660 | /* | |
661 | * we either finished a handshake or ignored the request, now try | |
662 | * again to obtain the (application) data we were asked for | |
663 | */ | |
664 | goto start; | |
665 | } | |
666 | ||
c661ac16 MC |
667 | if (s->rlayer.d->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) { |
668 | int alert_level = s->rlayer.d->alert_fragment[0]; | |
669 | int alert_descr = s->rlayer.d->alert_fragment[1]; | |
0f113f3e | 670 | |
c661ac16 | 671 | s->rlayer.d->alert_fragment_len = 0; |
0f113f3e MC |
672 | |
673 | if (s->msg_callback) | |
674 | s->msg_callback(0, s->version, SSL3_RT_ALERT, | |
c661ac16 MC |
675 | s->rlayer.d->alert_fragment, 2, s, |
676 | s->msg_callback_arg); | |
0f113f3e MC |
677 | |
678 | if (s->info_callback != NULL) | |
679 | cb = s->info_callback; | |
680 | else if (s->ctx->info_callback != NULL) | |
681 | cb = s->ctx->info_callback; | |
682 | ||
683 | if (cb != NULL) { | |
684 | j = (alert_level << 8) | alert_descr; | |
685 | cb(s, SSL_CB_READ_ALERT, j); | |
686 | } | |
687 | ||
fd865cad | 688 | if (alert_level == SSL3_AL_WARNING) { |
0f113f3e MC |
689 | s->s3->warn_alert = alert_descr; |
690 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) { | |
7e159e01 | 691 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
692 | /* |
693 | * With SCTP and streams the socket may deliver app data | |
694 | * after a close_notify alert. We have to check this first so | |
695 | * that nothing gets discarded. | |
696 | */ | |
697 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
698 | BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
699 | s->d1->shutdown_received = 1; | |
700 | s->rwstate = SSL_READING; | |
701 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
702 | BIO_set_retry_read(SSL_get_rbio(s)); | |
703 | return -1; | |
704 | } | |
7e159e01 | 705 | #endif |
0f113f3e MC |
706 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; |
707 | return (0); | |
708 | } | |
36d16f8e BL |
709 | #if 0 |
710 | /* XXX: this is a possible improvement in the future */ | |
0f113f3e MC |
711 | /* now check if it's a missing record */ |
712 | if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) { | |
713 | unsigned short seq; | |
714 | unsigned int frag_off; | |
c661ac16 | 715 | unsigned char *p = &(s->rlayer.d->alert_fragment[2]); |
0f113f3e MC |
716 | |
717 | n2s(p, seq); | |
718 | n2l3(p, frag_off); | |
719 | ||
720 | dtls1_retransmit_message(s, | |
721 | dtls1_get_queue_priority | |
722 | (frag->msg_header.seq, 0), frag_off, | |
723 | &found); | |
724 | if (!found && SSL_in_init(s)) { | |
725 | /* | |
726 | * fprintf( stderr,"in init = %d\n", SSL_in_init(s)); | |
727 | */ | |
728 | /* | |
729 | * requested a message not yet sent, send an alert | |
730 | * ourselves | |
731 | */ | |
732 | ssl3_send_alert(s, SSL3_AL_WARNING, | |
733 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); | |
734 | } | |
735 | } | |
36d16f8e | 736 | #endif |
fd865cad | 737 | } else if (alert_level == SSL3_AL_FATAL) { |
0f113f3e MC |
738 | char tmp[16]; |
739 | ||
740 | s->rwstate = SSL_NOTHING; | |
741 | s->s3->fatal_alert = alert_descr; | |
a230b26e | 742 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); |
0f113f3e MC |
743 | BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr); |
744 | ERR_add_error_data(2, "SSL alert number ", tmp); | |
745 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
e2bb9b9b | 746 | SSL_CTX_remove_session(s->session_ctx, s->session); |
0f113f3e MC |
747 | return (0); |
748 | } else { | |
749 | al = SSL_AD_ILLEGAL_PARAMETER; | |
750 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE); | |
751 | goto f_err; | |
752 | } | |
753 | ||
754 | goto start; | |
755 | } | |
756 | ||
757 | if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a | |
758 | * shutdown */ | |
759 | s->rwstate = SSL_NOTHING; | |
747e1639 | 760 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
761 | return (0); |
762 | } | |
763 | ||
747e1639 | 764 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
765 | /* |
766 | * We can't process a CCS now, because previous handshake messages | |
767 | * are still missing, so just drop it. | |
768 | */ | |
c69f2adf | 769 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
770 | goto start; |
771 | } | |
772 | ||
773 | /* | |
774 | * Unexpected handshake message (Client Hello, or protocol violation) | |
775 | */ | |
c661ac16 | 776 | if ((s->rlayer.d->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
024f543c | 777 | !ossl_statem_get_in_handshake(s)) { |
0f113f3e MC |
778 | struct hm_header_st msg_hdr; |
779 | ||
780 | /* this may just be a stale retransmit */ | |
781 | dtls1_get_message_header(rr->data, &msg_hdr); | |
747e1639 MC |
782 | if (SSL3_RECORD_get_epoch(rr) != s->rlayer.d->r_epoch) { |
783 | SSL3_RECORD_set_length(rr, 0); | |
0f113f3e MC |
784 | goto start; |
785 | } | |
786 | ||
787 | /* | |
788 | * If we are server, we may have a repeated FINISHED of the client | |
789 | * here, then retransmit our CCS and FINISHED. | |
790 | */ | |
791 | if (msg_hdr.type == SSL3_MT_FINISHED) { | |
792 | if (dtls1_check_timeout_num(s) < 0) | |
793 | return -1; | |
794 | ||
17dd65e6 | 795 | dtls1_retransmit_buffered_messages(s); |
747e1639 | 796 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
797 | goto start; |
798 | } | |
799 | ||
49ae7423 | 800 | if (SSL_is_init_finished(s) && |
0f113f3e | 801 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) { |
fe3a3291 | 802 | ossl_statem_set_in_init(s, 1); |
0f113f3e MC |
803 | s->renegotiate = 1; |
804 | s->new_session = 1; | |
805 | } | |
806 | i = s->handshake_func(s); | |
807 | if (i < 0) | |
808 | return (i); | |
809 | if (i == 0) { | |
810 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
811 | return (-1); | |
812 | } | |
813 | ||
814 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 815 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 816 | /* no read-ahead left? */ |
0f113f3e MC |
817 | BIO *bio; |
818 | /* | |
819 | * In the case where we try to read application data, but we | |
820 | * trigger an SSL handshake, we return -1 with the retry | |
821 | * option set. Otherwise renegotiation may cause nasty | |
822 | * problems in the blocking world | |
823 | */ | |
824 | s->rwstate = SSL_READING; | |
825 | bio = SSL_get_rbio(s); | |
826 | BIO_clear_retry_flags(bio); | |
827 | BIO_set_retry_read(bio); | |
828 | return (-1); | |
829 | } | |
830 | } | |
831 | goto start; | |
832 | } | |
833 | ||
747e1639 | 834 | switch (SSL3_RECORD_get_type(rr)) { |
0f113f3e | 835 | default: |
0f113f3e MC |
836 | /* TLS just ignores unknown message types */ |
837 | if (s->version == TLS1_VERSION) { | |
747e1639 | 838 | SSL3_RECORD_set_length(rr, 0); |
0f113f3e MC |
839 | goto start; |
840 | } | |
0f113f3e MC |
841 | al = SSL_AD_UNEXPECTED_MESSAGE; |
842 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
843 | goto f_err; | |
844 | case SSL3_RT_CHANGE_CIPHER_SPEC: | |
845 | case SSL3_RT_ALERT: | |
846 | case SSL3_RT_HANDSHAKE: | |
847 | /* | |
848 | * we already handled all of these, with the possible exception of | |
024f543c MC |
849 | * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but |
850 | * that should not happen when type != rr->type | |
0f113f3e MC |
851 | */ |
852 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
853 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
854 | goto f_err; | |
855 | case SSL3_RT_APPLICATION_DATA: | |
856 | /* | |
857 | * At this point, we were expecting handshake data, but have | |
858 | * application data. If the library was running inside ssl3_read() | |
859 | * (i.e. in_read_app_data is set) and it makes sense to read | |
860 | * application data at this point (session renegotiation not yet | |
861 | * started), we will indulge it. | |
862 | */ | |
863 | if (s->s3->in_read_app_data && | |
864 | (s->s3->total_renegotiations != 0) && | |
fe3a3291 | 865 | ossl_statem_app_data_allowed(s)) { |
0f113f3e MC |
866 | s->s3->in_read_app_data = 2; |
867 | return (-1); | |
868 | } else { | |
869 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
870 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
871 | goto f_err; | |
872 | } | |
873 | } | |
874 | /* not reached */ | |
875 | ||
876 | f_err: | |
877 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
0f113f3e MC |
878 | return (-1); |
879 | } | |
880 | ||
0f113f3e MC |
881 | /* |
882 | * this only happens when a client hello is received and a handshake | |
883 | * is started. | |
884 | */ | |
6f7ae319 | 885 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
a773b52a | 886 | int len) |
0f113f3e MC |
887 | { |
888 | ||
c661ac16 | 889 | if ((type == SSL3_RT_HANDSHAKE) |
a230b26e | 890 | && (s->rlayer.d->handshake_fragment_len > 0)) |
0f113f3e MC |
891 | /* (partially) satisfy request from storage */ |
892 | { | |
c661ac16 | 893 | unsigned char *src = s->rlayer.d->handshake_fragment; |
0f113f3e MC |
894 | unsigned char *dst = buf; |
895 | unsigned int k, n; | |
896 | ||
897 | /* peek == 0 */ | |
898 | n = 0; | |
c661ac16 | 899 | while ((len > 0) && (s->rlayer.d->handshake_fragment_len > 0)) { |
0f113f3e MC |
900 | *dst++ = *src++; |
901 | len--; | |
c661ac16 | 902 | s->rlayer.d->handshake_fragment_len--; |
0f113f3e MC |
903 | n++; |
904 | } | |
905 | /* move any remaining fragment bytes: */ | |
c661ac16 MC |
906 | for (k = 0; k < s->rlayer.d->handshake_fragment_len; k++) |
907 | s->rlayer.d->handshake_fragment[k] = *src++; | |
0f113f3e MC |
908 | return n; |
909 | } | |
910 | ||
911 | return 0; | |
912 | } | |
913 | ||
914 | /* | |
915 | * Call this to write data in records of type 'type' It will return <= 0 if | |
916 | * not all data has been sent or non-blocking IO. | |
36d16f8e | 917 | */ |
480b9e5d | 918 | int dtls1_write_bytes(SSL *s, int type, const void *buf, int len) |
0f113f3e MC |
919 | { |
920 | int i; | |
921 | ||
922 | OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH); | |
923 | s->rwstate = SSL_NOTHING; | |
924 | i = do_dtls1_write(s, type, buf, len, 0); | |
925 | return i; | |
926 | } | |
927 | ||
928 | int do_dtls1_write(SSL *s, int type, const unsigned char *buf, | |
929 | unsigned int len, int create_empty_fragment) | |
930 | { | |
931 | unsigned char *p, *pseq; | |
932 | int i, mac_size, clear = 0; | |
933 | int prefix_len = 0; | |
934 | int eivlen; | |
f482740f | 935 | SSL3_RECORD wr; |
0f113f3e MC |
936 | SSL3_BUFFER *wb; |
937 | SSL_SESSION *sess; | |
938 | ||
d102d9df | 939 | wb = &s->rlayer.wbuf[0]; |
db9a32e7 | 940 | |
0f113f3e MC |
941 | /* |
942 | * first check if there is a SSL3_BUFFER still being written out. This | |
943 | * will happen with non blocking IO | |
944 | */ | |
db9a32e7 | 945 | if (SSL3_BUFFER_get_left(wb) != 0) { |
0f113f3e MC |
946 | OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */ |
947 | return (ssl3_write_pending(s, type, buf, len)); | |
948 | } | |
949 | ||
950 | /* If we have an alert to send, lets send it */ | |
951 | if (s->s3->alert_dispatch) { | |
952 | i = s->method->ssl_dispatch_alert(s); | |
953 | if (i <= 0) | |
954 | return (i); | |
955 | /* if it went, fall through and send more stuff */ | |
956 | } | |
957 | ||
958 | if (len == 0 && !create_empty_fragment) | |
959 | return 0; | |
960 | ||
0f113f3e MC |
961 | sess = s->session; |
962 | ||
963 | if ((sess == NULL) || | |
964 | (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL)) | |
965 | clear = 1; | |
966 | ||
967 | if (clear) | |
968 | mac_size = 0; | |
969 | else { | |
970 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
971 | if (mac_size < 0) | |
972 | goto err; | |
973 | } | |
974 | ||
747e1639 | 975 | p = SSL3_BUFFER_get_buf(wb) + prefix_len; |
0f113f3e MC |
976 | |
977 | /* write the header */ | |
978 | ||
979 | *(p++) = type & 0xff; | |
f482740f | 980 | SSL3_RECORD_set_type(&wr, type); |
0f113f3e MC |
981 | /* |
982 | * Special case: for hello verify request, client version 1.0 and we | |
983 | * haven't decided which version to use yet send back using version 1.0 | |
984 | * header: otherwise some clients will ignore it. | |
985 | */ | |
032924c4 | 986 | if (s->method->version == DTLS_ANY_VERSION && |
a230b26e | 987 | s->max_proto_version != DTLS1_BAD_VER) { |
0f113f3e MC |
988 | *(p++) = DTLS1_VERSION >> 8; |
989 | *(p++) = DTLS1_VERSION & 0xff; | |
990 | } else { | |
991 | *(p++) = s->version >> 8; | |
992 | *(p++) = s->version & 0xff; | |
993 | } | |
994 | ||
995 | /* field where we are to write out packet epoch, seq num and len */ | |
996 | pseq = p; | |
997 | p += 10; | |
998 | ||
999 | /* Explicit IV length, block ciphers appropriate version flag */ | |
1000 | if (s->enc_write_ctx) { | |
1001 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx); | |
1002 | if (mode == EVP_CIPH_CBC_MODE) { | |
1003 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx); | |
1004 | if (eivlen <= 1) | |
1005 | eivlen = 0; | |
1006 | } | |
1007 | /* Need explicit part of IV for GCM mode */ | |
1008 | else if (mode == EVP_CIPH_GCM_MODE) | |
1009 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
e75c5a79 DSH |
1010 | else if (mode == EVP_CIPH_CCM_MODE) |
1011 | eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN; | |
0f113f3e MC |
1012 | else |
1013 | eivlen = 0; | |
1014 | } else | |
1015 | eivlen = 0; | |
1016 | ||
1017 | /* lets setup the record stuff. */ | |
f482740f MC |
1018 | SSL3_RECORD_set_data(&wr, p + eivlen); /* make room for IV in case of CBC */ |
1019 | SSL3_RECORD_set_length(&wr, (int)len); | |
1020 | SSL3_RECORD_set_input(&wr, (unsigned char *)buf); | |
0f113f3e MC |
1021 | |
1022 | /* | |
f482740f | 1023 | * we now 'read' from wr.input, wr.length bytes into wr.data |
0f113f3e MC |
1024 | */ |
1025 | ||
1026 | /* first we compress */ | |
1027 | if (s->compress != NULL) { | |
f482740f | 1028 | if (!ssl3_do_compress(s, &wr)) { |
0f113f3e MC |
1029 | SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_COMPRESSION_FAILURE); |
1030 | goto err; | |
1031 | } | |
1032 | } else { | |
f482740f MC |
1033 | memcpy(SSL3_RECORD_get_data(&wr), SSL3_RECORD_get_input(&wr), |
1034 | SSL3_RECORD_get_length(&wr)); | |
1035 | SSL3_RECORD_reset_input(&wr); | |
0f113f3e | 1036 | } |
36d16f8e | 1037 | |
0f113f3e | 1038 | /* |
f482740f MC |
1039 | * we should still have the output to wr.data and the input from |
1040 | * wr.input. Length should be wr.length. wr.data still points in the | |
0f113f3e MC |
1041 | * wb->buf |
1042 | */ | |
36d16f8e | 1043 | |
0f113f3e | 1044 | if (mac_size != 0) { |
f482740f | 1045 | if (s->method->ssl3_enc->mac(s, &wr, |
a230b26e EK |
1046 | &(p[SSL3_RECORD_get_length(&wr) + eivlen]), |
1047 | 1) < 0) | |
0f113f3e | 1048 | goto err; |
f482740f | 1049 | SSL3_RECORD_add_length(&wr, mac_size); |
0f113f3e | 1050 | } |
36d16f8e | 1051 | |
0f113f3e | 1052 | /* this is true regardless of mac size */ |
f482740f MC |
1053 | SSL3_RECORD_set_data(&wr, p); |
1054 | SSL3_RECORD_reset_input(&wr); | |
36d16f8e | 1055 | |
0f113f3e | 1056 | if (eivlen) |
f482740f | 1057 | SSL3_RECORD_add_length(&wr, eivlen); |
36d16f8e | 1058 | |
f482740f | 1059 | if (s->method->ssl3_enc->enc(s, &wr, 1, 1) < 1) |
0f113f3e | 1060 | goto err; |
36d16f8e | 1061 | |
0f113f3e MC |
1062 | /* record length after mac and block padding */ |
1063 | /* | |
1064 | * if (type == SSL3_RT_APPLICATION_DATA || (type == SSL3_RT_ALERT && ! | |
1065 | * SSL_in_init(s))) | |
1066 | */ | |
36d16f8e | 1067 | |
0f113f3e | 1068 | /* there's only one epoch between handshake and app data */ |
36d16f8e | 1069 | |
78a39fe7 | 1070 | s2n(s->rlayer.d->w_epoch, pseq); |
36d16f8e | 1071 | |
0f113f3e MC |
1072 | /* XDTLS: ?? */ |
1073 | /* | |
1074 | * else s2n(s->d1->handshake_epoch, pseq); | |
1075 | */ | |
36d16f8e | 1076 | |
de07f311 | 1077 | memcpy(pseq, &(s->rlayer.write_sequence[2]), 6); |
0f113f3e | 1078 | pseq += 6; |
f482740f | 1079 | s2n(SSL3_RECORD_get_length(&wr), pseq); |
36d16f8e | 1080 | |
0f113f3e MC |
1081 | if (s->msg_callback) |
1082 | s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH, | |
1083 | DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg); | |
36d16f8e | 1084 | |
0f113f3e | 1085 | /* |
f482740f | 1086 | * we should now have wr.data pointing to the encrypted data, which is |
0f113f3e MC |
1087 | * wr->length long |
1088 | */ | |
f482740f MC |
1089 | SSL3_RECORD_set_type(&wr, type); /* not needed but helps for debugging */ |
1090 | SSL3_RECORD_add_length(&wr, DTLS1_RT_HEADER_LENGTH); | |
36d16f8e | 1091 | |
de07f311 | 1092 | ssl3_record_sequence_update(&(s->rlayer.write_sequence[0])); |
36d16f8e | 1093 | |
0f113f3e MC |
1094 | if (create_empty_fragment) { |
1095 | /* | |
1096 | * we are in a recursive call; just return the length, don't write | |
1097 | * out anything here | |
1098 | */ | |
f482740f | 1099 | return wr.length; |
0f113f3e | 1100 | } |
36d16f8e | 1101 | |
0f113f3e | 1102 | /* now let's set up wb */ |
f482740f | 1103 | SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(&wr)); |
747e1639 | 1104 | SSL3_BUFFER_set_offset(wb, 0); |
0f113f3e MC |
1105 | |
1106 | /* | |
1107 | * memorize arguments so that ssl3_write_pending can detect bad write | |
1108 | * retries later | |
1109 | */ | |
f8caa3c8 MC |
1110 | s->rlayer.wpend_tot = len; |
1111 | s->rlayer.wpend_buf = buf; | |
1112 | s->rlayer.wpend_type = type; | |
1113 | s->rlayer.wpend_ret = len; | |
0f113f3e MC |
1114 | |
1115 | /* we now just need to write the buffer */ | |
1116 | return ssl3_write_pending(s, type, buf, len); | |
1117 | err: | |
1118 | return -1; | |
1119 | } | |
36d16f8e | 1120 | |
fe589e61 | 1121 | DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, |
a230b26e | 1122 | unsigned int *is_next_epoch) |
0f113f3e MC |
1123 | { |
1124 | ||
36d16f8e BL |
1125 | *is_next_epoch = 0; |
1126 | ||
1127 | /* In current epoch, accept HM, CCS, DATA, & ALERT */ | |
78a39fe7 | 1128 | if (rr->epoch == s->rlayer.d->r_epoch) |
91f93f69 | 1129 | return &s->rlayer.d->bitmap; |
36d16f8e | 1130 | |
738ad946 MC |
1131 | /* |
1132 | * Only HM and ALERT messages can be from the next epoch and only if we | |
1133 | * have already processed all of the unprocessed records from the last | |
1134 | * epoch | |
1135 | */ | |
78a39fe7 | 1136 | else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) && |
738ad946 | 1137 | s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch && |
a230b26e | 1138 | (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) { |
36d16f8e | 1139 | *is_next_epoch = 1; |
91f93f69 | 1140 | return &s->rlayer.d->next_bitmap; |
0f113f3e | 1141 | } |
36d16f8e BL |
1142 | |
1143 | return NULL; | |
0f113f3e | 1144 | } |
36d16f8e | 1145 | |
0f113f3e MC |
1146 | void dtls1_reset_seq_numbers(SSL *s, int rw) |
1147 | { | |
1148 | unsigned char *seq; | |
de07f311 | 1149 | unsigned int seq_bytes = sizeof(s->rlayer.read_sequence); |
0f113f3e MC |
1150 | |
1151 | if (rw & SSL3_CC_READ) { | |
de07f311 | 1152 | seq = s->rlayer.read_sequence; |
78a39fe7 | 1153 | s->rlayer.d->r_epoch++; |
16f8d4eb RS |
1154 | memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap, |
1155 | sizeof(s->rlayer.d->bitmap)); | |
a230b26e | 1156 | memset(&s->rlayer.d->next_bitmap, 0, sizeof(s->rlayer.d->next_bitmap)); |
0f113f3e | 1157 | } else { |
de07f311 | 1158 | seq = s->rlayer.write_sequence; |
3bb8f87d | 1159 | memcpy(s->rlayer.d->last_write_sequence, seq, |
de07f311 | 1160 | sizeof(s->rlayer.write_sequence)); |
78a39fe7 | 1161 | s->rlayer.d->w_epoch++; |
0f113f3e MC |
1162 | } |
1163 | ||
16f8d4eb | 1164 | memset(seq, 0, seq_bytes); |
0f113f3e | 1165 | } |