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Commit | Line | Data |
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0f113f3e | 1 | /* |
e39e295e | 2 | * Copyright 2005-2020 The OpenSSL Project Authors. All Rights Reserved. |
0f113f3e | 3 | * |
2c18d164 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
846e33c7 RS |
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> | |
706457b7 | 12 | #include "../ssl_local.h" |
36d16f8e BL |
13 | #include <openssl/evp.h> |
14 | #include <openssl/buffer.h> | |
706457b7 | 15 | #include "record_local.h" |
0d345f0e | 16 | #include "internal/packet.h" |
67dc995e | 17 | #include "internal/cryptlib.h" |
40f37188 MC |
18 | |
19 | int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl) | |
20 | { | |
21 | DTLS_RECORD_LAYER *d; | |
0485d540 | 22 | |
fe1128dc RS |
23 | if ((d = OPENSSL_malloc(sizeof(*d))) == NULL) { |
24 | SSLerr(SSL_F_DTLS_RECORD_LAYER_NEW, ERR_R_MALLOC_FAILURE); | |
26a7d938 | 25 | return 0; |
fe1128dc | 26 | } |
40f37188 MC |
27 | |
28 | rl->d = d; | |
5fb6f80c | 29 | |
cb2ce7ab MC |
30 | d->unprocessed_rcds.q = pqueue_new(); |
31 | d->processed_rcds.q = pqueue_new(); | |
24a1e2f2 | 32 | d->buffered_app_data.q = pqueue_new(); |
cb2ce7ab | 33 | |
a71edf3b MC |
34 | if (d->unprocessed_rcds.q == NULL || d->processed_rcds.q == NULL |
35 | || d->buffered_app_data.q == NULL) { | |
25aaa98a RS |
36 | pqueue_free(d->unprocessed_rcds.q); |
37 | pqueue_free(d->processed_rcds.q); | |
38 | pqueue_free(d->buffered_app_data.q); | |
cb2ce7ab MC |
39 | OPENSSL_free(d); |
40 | rl->d = NULL; | |
26a7d938 | 41 | return 0; |
cb2ce7ab | 42 | } |
40f37188 MC |
43 | |
44 | return 1; | |
45 | } | |
46 | ||
47 | void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl) | |
48 | { | |
cb2ce7ab MC |
49 | DTLS_RECORD_LAYER_clear(rl); |
50 | pqueue_free(rl->d->unprocessed_rcds.q); | |
51 | pqueue_free(rl->d->processed_rcds.q); | |
24a1e2f2 | 52 | pqueue_free(rl->d->buffered_app_data.q); |
40f37188 MC |
53 | OPENSSL_free(rl->d); |
54 | rl->d = NULL; | |
55 | } | |
56 | ||
57 | void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl) | |
58 | { | |
59 | DTLS_RECORD_LAYER *d; | |
cb2ce7ab MC |
60 | pitem *item = NULL; |
61 | DTLS1_RECORD_DATA *rdata; | |
cf2cede4 RS |
62 | pqueue *unprocessed_rcds; |
63 | pqueue *processed_rcds; | |
64 | pqueue *buffered_app_data; | |
cb2ce7ab | 65 | |
40f37188 | 66 | d = rl->d; |
0485d540 | 67 | |
cb2ce7ab MC |
68 | while ((item = pqueue_pop(d->unprocessed_rcds.q)) != NULL) { |
69 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
b548a1f1 | 70 | OPENSSL_free(rdata->rbuf.buf); |
cb2ce7ab MC |
71 | OPENSSL_free(item->data); |
72 | pitem_free(item); | |
73 | } | |
74 | ||
75 | while ((item = pqueue_pop(d->processed_rcds.q)) != NULL) { | |
76 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
163b8016 ME |
77 | if (rl->s->options & SSL_OP_CLEANSE_PLAINTEXT) |
78 | OPENSSL_cleanse(rdata->rbuf.buf, rdata->rbuf.len); | |
b548a1f1 | 79 | OPENSSL_free(rdata->rbuf.buf); |
cb2ce7ab MC |
80 | OPENSSL_free(item->data); |
81 | pitem_free(item); | |
82 | } | |
83 | ||
24a1e2f2 MC |
84 | while ((item = pqueue_pop(d->buffered_app_data.q)) != NULL) { |
85 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
163b8016 ME |
86 | if (rl->s->options & SSL_OP_CLEANSE_PLAINTEXT) |
87 | OPENSSL_cleanse(rdata->rbuf.buf, rdata->rbuf.len); | |
b548a1f1 | 88 | OPENSSL_free(rdata->rbuf.buf); |
24a1e2f2 MC |
89 | OPENSSL_free(item->data); |
90 | pitem_free(item); | |
91 | } | |
92 | ||
cb2ce7ab MC |
93 | unprocessed_rcds = d->unprocessed_rcds.q; |
94 | processed_rcds = d->processed_rcds.q; | |
24a1e2f2 | 95 | buffered_app_data = d->buffered_app_data.q; |
b4faea50 | 96 | memset(d, 0, sizeof(*d)); |
cb2ce7ab MC |
97 | d->unprocessed_rcds.q = unprocessed_rcds; |
98 | d->processed_rcds.q = processed_rcds; | |
24a1e2f2 | 99 | d->buffered_app_data.q = buffered_app_data; |
40f37188 MC |
100 | } |
101 | ||
3bb8f87d MC |
102 | void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e) |
103 | { | |
104 | if (e == rl->d->w_epoch - 1) { | |
105 | memcpy(rl->d->curr_write_sequence, | |
a230b26e | 106 | rl->write_sequence, sizeof(rl->write_sequence)); |
3bb8f87d | 107 | memcpy(rl->write_sequence, |
a230b26e | 108 | rl->d->last_write_sequence, sizeof(rl->write_sequence)); |
3bb8f87d MC |
109 | } else if (e == rl->d->w_epoch + 1) { |
110 | memcpy(rl->d->last_write_sequence, | |
a230b26e | 111 | rl->write_sequence, sizeof(unsigned char[8])); |
3bb8f87d | 112 | memcpy(rl->write_sequence, |
a230b26e | 113 | rl->d->curr_write_sequence, sizeof(rl->write_sequence)); |
3bb8f87d MC |
114 | } |
115 | rl->d->w_epoch = e; | |
116 | } | |
117 | ||
e3d0dae7 MC |
118 | void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq) |
119 | { | |
120 | memcpy(rl->write_sequence, seq, SEQ_NUM_SIZE); | |
121 | } | |
122 | ||
36d16f8e | 123 | /* copy buffered record into SSL structure */ |
0f113f3e MC |
124 | static int dtls1_copy_record(SSL *s, pitem *item) |
125 | { | |
36d16f8e BL |
126 | DTLS1_RECORD_DATA *rdata; |
127 | ||
128 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
0f113f3e | 129 | |
88c23039 | 130 | SSL3_BUFFER_release(&s->rlayer.rbuf); |
0f113f3e | 131 | |
7a7048af MC |
132 | s->rlayer.packet = rdata->packet; |
133 | s->rlayer.packet_length = rdata->packet_length; | |
88c23039 MC |
134 | memcpy(&s->rlayer.rbuf, &(rdata->rbuf), sizeof(SSL3_BUFFER)); |
135 | memcpy(&s->rlayer.rrec, &(rdata->rrec), sizeof(SSL3_RECORD)); | |
36d16f8e | 136 | |
0f113f3e | 137 | /* Set proper sequence number for mac calculation */ |
de07f311 | 138 | memcpy(&(s->rlayer.read_sequence[2]), &(rdata->packet[5]), 6); |
0f113f3e | 139 | |
208fb891 | 140 | return 1; |
0f113f3e | 141 | } |
36d16f8e | 142 | |
6f7ae319 | 143 | int dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority) |
0f113f3e MC |
144 | { |
145 | DTLS1_RECORD_DATA *rdata; | |
146 | pitem *item; | |
147 | ||
148 | /* Limit the size of the queue to prevent DOS attacks */ | |
149 | if (pqueue_size(queue->q) >= 100) | |
150 | return 0; | |
151 | ||
b4faea50 | 152 | rdata = OPENSSL_malloc(sizeof(*rdata)); |
0f113f3e MC |
153 | item = pitem_new(priority, rdata); |
154 | if (rdata == NULL || item == NULL) { | |
b548a1f1 | 155 | OPENSSL_free(rdata); |
25aaa98a | 156 | pitem_free(item); |
c2853382 MC |
157 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DTLS1_BUFFER_RECORD, |
158 | 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)) { | |
c2853382 | 185 | /* SSLfatal() already called */ |
b548a1f1 | 186 | OPENSSL_free(rdata->rbuf.buf); |
0f113f3e MC |
187 | OPENSSL_free(rdata); |
188 | pitem_free(item); | |
26a7d938 | 189 | return -1; |
0f113f3e | 190 | } |
36d16f8e | 191 | |
0f113f3e | 192 | if (pqueue_insert(queue->q, item) == NULL) { |
840facc3 | 193 | /* Must be a duplicate so ignore it */ |
b548a1f1 | 194 | OPENSSL_free(rdata->rbuf.buf); |
0f113f3e MC |
195 | OPENSSL_free(rdata); |
196 | pitem_free(item); | |
0f113f3e | 197 | } |
36d16f8e | 198 | |
208fb891 | 199 | return 1; |
0f113f3e MC |
200 | } |
201 | ||
fe589e61 | 202 | int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue) |
0f113f3e | 203 | { |
36d16f8e BL |
204 | pitem *item; |
205 | ||
206 | item = pqueue_pop(queue->q); | |
0f113f3e | 207 | if (item) { |
36d16f8e BL |
208 | dtls1_copy_record(s, item); |
209 | ||
210 | OPENSSL_free(item->data); | |
0f113f3e | 211 | pitem_free(item); |
36d16f8e | 212 | |
208fb891 | 213 | return 1; |
36d16f8e BL |
214 | } |
215 | ||
26a7d938 | 216 | return 0; |
0f113f3e | 217 | } |
36d16f8e | 218 | |
0f113f3e MC |
219 | /* |
220 | * retrieve a buffered record that belongs to the new epoch, i.e., not | |
221 | * processed yet | |
222 | */ | |
36d16f8e BL |
223 | #define dtls1_get_unprocessed_record(s) \ |
224 | dtls1_retrieve_buffered_record((s), \ | |
cb2ce7ab | 225 | &((s)->rlayer.d->unprocessed_rcds)) |
36d16f8e | 226 | |
fe589e61 | 227 | int dtls1_process_buffered_records(SSL *s) |
0f113f3e | 228 | { |
36d16f8e | 229 | pitem *item; |
738ad946 | 230 | SSL3_BUFFER *rb; |
1fb9fdc3 MC |
231 | SSL3_RECORD *rr; |
232 | DTLS1_BITMAP *bitmap; | |
233 | unsigned int is_next_epoch; | |
234 | int replayok = 1; | |
0f113f3e | 235 | |
cb2ce7ab | 236 | item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q); |
0f113f3e | 237 | if (item) { |
36d16f8e | 238 | /* Check if epoch is current. */ |
cb2ce7ab | 239 | if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch) |
1fb9fdc3 MC |
240 | return 1; /* Nothing to do. */ |
241 | ||
242 | rr = RECORD_LAYER_get_rrec(&s->rlayer); | |
0f113f3e | 243 | |
738ad946 MC |
244 | rb = RECORD_LAYER_get_rbuf(&s->rlayer); |
245 | ||
246 | if (SSL3_BUFFER_get_left(rb) > 0) { | |
247 | /* | |
248 | * We've still got data from the current packet to read. There could | |
249 | * be a record from the new epoch in it - so don't overwrite it | |
250 | * with the unprocessed records yet (we'll do it when we've | |
251 | * finished reading the current packet). | |
252 | */ | |
253 | return 1; | |
254 | } | |
255 | ||
36d16f8e | 256 | /* Process all the records. */ |
cb2ce7ab | 257 | while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) { |
36d16f8e | 258 | dtls1_get_unprocessed_record(s); |
1fb9fdc3 MC |
259 | bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch); |
260 | if (bitmap == NULL) { | |
261 | /* | |
262 | * Should not happen. This will only ever be NULL when the | |
263 | * current record is from a different epoch. But that cannot | |
264 | * be the case because we already checked the epoch above | |
265 | */ | |
c2853382 MC |
266 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, |
267 | SSL_F_DTLS1_PROCESS_BUFFERED_RECORDS, | |
268 | ERR_R_INTERNAL_ERROR); | |
1fb9fdc3 MC |
269 | return 0; |
270 | } | |
271 | #ifndef OPENSSL_NO_SCTP | |
272 | /* Only do replay check if no SCTP bio */ | |
273 | if (!BIO_dgram_is_sctp(SSL_get_rbio(s))) | |
274 | #endif | |
275 | { | |
276 | /* | |
277 | * Check whether this is a repeat, or aged record. We did this | |
278 | * check once already when we first received the record - but | |
279 | * we might have updated the window since then due to | |
280 | * records we subsequently processed. | |
281 | */ | |
282 | replayok = dtls1_record_replay_check(s, bitmap); | |
283 | } | |
284 | ||
285 | if (!replayok || !dtls1_process_record(s, bitmap)) { | |
c2853382 MC |
286 | if (ossl_statem_in_error(s)) { |
287 | /* dtls1_process_record called SSLfatal() */ | |
288 | return -1; | |
289 | } | |
1fb9fdc3 MC |
290 | /* dump this record */ |
291 | rr->length = 0; | |
292 | RECORD_LAYER_reset_packet_length(&s->rlayer); | |
293 | continue; | |
294 | } | |
295 | ||
cb2ce7ab | 296 | if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds), |
c2853382 MC |
297 | SSL3_RECORD_get_seq_num(s->rlayer.rrec)) < 0) { |
298 | /* SSLfatal() already called */ | |
1fb9fdc3 | 299 | return 0; |
c2853382 | 300 | } |
36d16f8e | 301 | } |
0f113f3e | 302 | } |
36d16f8e | 303 | |
0f113f3e MC |
304 | /* |
305 | * sync epoch numbers once all the unprocessed records have been | |
306 | * processed | |
307 | */ | |
cb2ce7ab MC |
308 | s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch; |
309 | s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1; | |
36d16f8e | 310 | |
1fb9fdc3 | 311 | return 1; |
0f113f3e | 312 | } |
36d16f8e | 313 | |
1d97c843 TH |
314 | /*- |
315 | * Return up to 'len' payload bytes received in 'type' records. | |
36d16f8e BL |
316 | * 'type' is one of the following: |
317 | * | |
318 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
319 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
320 | * - 0 (during a shutdown, no data has to be returned) | |
321 | * | |
322 | * If we don't have stored data to work from, read a SSL/TLS record first | |
323 | * (possibly multiple records if we still don't have anything to return). | |
324 | * | |
325 | * This function must handle any surprises the peer may have for us, such as | |
c69f2adf MC |
326 | * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec |
327 | * messages are treated as if they were handshake messages *if* the |recd_type| | |
328 | * argument is non NULL. | |
36d16f8e BL |
329 | * Also if record payloads contain fragments too small to process, we store |
330 | * them until there is enough for the respective protocol (the record protocol | |
331 | * may use arbitrary fragmentation and even interleaving): | |
332 | * Change cipher spec protocol | |
333 | * just 1 byte needed, no need for keeping anything stored | |
334 | * Alert protocol | |
335 | * 2 bytes needed (AlertLevel, AlertDescription) | |
336 | * Handshake protocol | |
337 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
338 | * to detect unexpected Client Hello and Hello Request messages | |
339 | * here, anything else is handled by higher layers | |
340 | * Application data protocol | |
341 | * none of our business | |
342 | */ | |
657da85e | 343 | int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf, |
02ba18a6 | 344 | size_t len, int peek, size_t *readbytes) |
0f113f3e | 345 | { |
c2853382 | 346 | int i, j, iret; |
bd990e25 | 347 | size_t n; |
0f113f3e MC |
348 | SSL3_RECORD *rr; |
349 | void (*cb) (const SSL *ssl, int type2, int val) = NULL; | |
350 | ||
88c23039 | 351 | if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) { |
28d59af8 | 352 | /* Not initialized yet */ |
c2853382 MC |
353 | if (!ssl3_setup_buffers(s)) { |
354 | /* SSLfatal() already called */ | |
26a7d938 | 355 | return -1; |
c2853382 | 356 | } |
28d59af8 | 357 | } |
0f113f3e MC |
358 | |
359 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && | |
360 | (type != SSL3_RT_HANDSHAKE)) || | |
361 | (peek && (type != SSL3_RT_APPLICATION_DATA))) { | |
921d84a0 MC |
362 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DTLS1_READ_BYTES, |
363 | ERR_R_INTERNAL_ERROR); | |
0f113f3e MC |
364 | return -1; |
365 | } | |
366 | ||
66fab923 | 367 | if (!ossl_statem_get_in_handshake(s) && SSL_in_init(s)) { |
0f113f3e MC |
368 | /* type == SSL3_RT_APPLICATION_DATA */ |
369 | i = s->handshake_func(s); | |
c2853382 | 370 | /* SSLfatal() already called if appropriate */ |
0f113f3e | 371 | if (i < 0) |
eda75751 | 372 | return i; |
c2853382 | 373 | if (i == 0) |
eda75751 | 374 | return -1; |
0f113f3e MC |
375 | } |
376 | ||
377 | start: | |
378 | s->rwstate = SSL_NOTHING; | |
379 | ||
50e735f9 | 380 | /*- |
555cbb32 TS |
381 | * s->s3.rrec.type - is the type of record |
382 | * s->s3.rrec.data, - data | |
383 | * s->s3.rrec.off, - offset into 'data' for next read | |
384 | * s->s3.rrec.length, - number of bytes. | |
50e735f9 | 385 | */ |
94777c9c | 386 | rr = s->rlayer.rrec; |
0f113f3e MC |
387 | |
388 | /* | |
389 | * We are not handshaking and have no data yet, so process data buffered | |
390 | * during the last handshake in advance, if any. | |
391 | */ | |
49ae7423 | 392 | if (SSL_is_init_finished(s) && SSL3_RECORD_get_length(rr) == 0) { |
0f113f3e | 393 | pitem *item; |
24a1e2f2 | 394 | item = pqueue_pop(s->rlayer.d->buffered_app_data.q); |
0f113f3e | 395 | if (item) { |
7e159e01 | 396 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
397 | /* Restore bio_dgram_sctp_rcvinfo struct */ |
398 | if (BIO_dgram_is_sctp(SSL_get_rbio(s))) { | |
399 | DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data; | |
400 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO, | |
401 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
402 | } | |
7e159e01 DSH |
403 | #endif |
404 | ||
0f113f3e MC |
405 | dtls1_copy_record(s, item); |
406 | ||
407 | OPENSSL_free(item->data); | |
408 | pitem_free(item); | |
409 | } | |
410 | } | |
411 | ||
412 | /* Check for timeout */ | |
d273b60b | 413 | if (dtls1_handle_timeout(s) > 0) { |
0f113f3e | 414 | goto start; |
d273b60b MC |
415 | } else if (ossl_statem_in_error(s)) { |
416 | /* dtls1_handle_timeout() has failed with a fatal error */ | |
417 | return -1; | |
418 | } | |
0f113f3e MC |
419 | |
420 | /* get new packet if necessary */ | |
747e1639 | 421 | if ((SSL3_RECORD_get_length(rr) == 0) |
a230b26e | 422 | || (s->rlayer.rstate == SSL_ST_READ_BODY)) { |
5b79813b | 423 | RECORD_LAYER_set_numrpipes(&s->rlayer, 0); |
eda75751 MC |
424 | iret = dtls1_get_record(s); |
425 | if (iret <= 0) { | |
426 | iret = dtls1_read_failed(s, iret); | |
c2853382 MC |
427 | /* |
428 | * Anything other than a timeout is an error. SSLfatal() already | |
429 | * called if appropriate. | |
430 | */ | |
eda75751 MC |
431 | if (iret <= 0) |
432 | return iret; | |
0f113f3e MC |
433 | else |
434 | goto start; | |
435 | } | |
5b79813b | 436 | RECORD_LAYER_set_numrpipes(&s->rlayer, 1); |
0f113f3e MC |
437 | } |
438 | ||
af58be76 MC |
439 | /* |
440 | * Reset the count of consecutive warning alerts if we've got a non-empty | |
441 | * record that isn't an alert. | |
442 | */ | |
443 | if (SSL3_RECORD_get_type(rr) != SSL3_RT_ALERT | |
444 | && SSL3_RECORD_get_length(rr) != 0) | |
445 | s->rlayer.alert_count = 0; | |
446 | ||
0f113f3e MC |
447 | /* we now have a packet which can be read and processed */ |
448 | ||
555cbb32 TS |
449 | if (s->s3.change_cipher_spec /* set when we receive ChangeCipherSpec, |
450 | * reset by ssl3_get_finished */ | |
747e1639 | 451 | && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) { |
0f113f3e MC |
452 | /* |
453 | * We now have application data between CCS and Finished. Most likely | |
454 | * the packets were reordered on their way, so buffer the application | |
455 | * data for later processing rather than dropping the connection. | |
456 | */ | |
24a1e2f2 | 457 | if (dtls1_buffer_record(s, &(s->rlayer.d->buffered_app_data), |
a230b26e | 458 | SSL3_RECORD_get_seq_num(rr)) < 0) { |
c2853382 | 459 | /* SSLfatal() already called */ |
0f113f3e MC |
460 | return -1; |
461 | } | |
747e1639 | 462 | SSL3_RECORD_set_length(rr, 0); |
66fab923 | 463 | SSL3_RECORD_set_read(rr); |
0f113f3e MC |
464 | goto start; |
465 | } | |
466 | ||
467 | /* | |
468 | * If the other end has shut down, throw anything we read away (even in | |
469 | * 'peek' mode) | |
470 | */ | |
471 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) { | |
747e1639 | 472 | SSL3_RECORD_set_length(rr, 0); |
66fab923 | 473 | SSL3_RECORD_set_read(rr); |
0f113f3e | 474 | s->rwstate = SSL_NOTHING; |
eda75751 | 475 | return 0; |
0f113f3e MC |
476 | } |
477 | ||
c69f2adf | 478 | if (type == SSL3_RECORD_get_type(rr) |
a230b26e EK |
479 | || (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC |
480 | && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) { | |
c69f2adf MC |
481 | /* |
482 | * SSL3_RT_APPLICATION_DATA or | |
483 | * SSL3_RT_HANDSHAKE or | |
484 | * SSL3_RT_CHANGE_CIPHER_SPEC | |
485 | */ | |
0f113f3e MC |
486 | /* |
487 | * make sure that we are not getting application data when we are | |
488 | * doing a handshake for the first time | |
489 | */ | |
490 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
491 | (s->enc_read_ctx == NULL)) { | |
c2853382 MC |
492 | SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES, |
493 | SSL_R_APP_DATA_IN_HANDSHAKE); | |
494 | return -1; | |
0f113f3e | 495 | } |
7e159e01 | 496 | |
c69f2adf MC |
497 | if (recvd_type != NULL) |
498 | *recvd_type = SSL3_RECORD_get_type(rr); | |
499 | ||
66fab923 MC |
500 | if (len == 0) { |
501 | /* | |
502 | * Mark a zero length record as read. This ensures multiple calls to | |
503 | * SSL_read() with a zero length buffer will eventually cause | |
504 | * SSL_pending() to report data as being available. | |
505 | */ | |
506 | if (SSL3_RECORD_get_length(rr) == 0) | |
507 | SSL3_RECORD_set_read(rr); | |
eda75751 | 508 | return 0; |
66fab923 | 509 | } |
0f113f3e | 510 | |
eda75751 | 511 | if (len > SSL3_RECORD_get_length(rr)) |
747e1639 | 512 | n = SSL3_RECORD_get_length(rr); |
0f113f3e | 513 | else |
eda75751 | 514 | n = len; |
0f113f3e | 515 | |
747e1639 | 516 | memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n); |
66fab923 MC |
517 | if (peek) { |
518 | if (SSL3_RECORD_get_length(rr) == 0) | |
519 | SSL3_RECORD_set_read(rr); | |
520 | } else { | |
163b8016 ME |
521 | if (s->options & SSL_OP_CLEANSE_PLAINTEXT) |
522 | OPENSSL_cleanse(&(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n); | |
753be41d | 523 | SSL3_RECORD_sub_length(rr, n); |
747e1639 MC |
524 | SSL3_RECORD_add_off(rr, n); |
525 | if (SSL3_RECORD_get_length(rr) == 0) { | |
295c3f41 | 526 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
747e1639 | 527 | SSL3_RECORD_set_off(rr, 0); |
66fab923 | 528 | SSL3_RECORD_set_read(rr); |
0f113f3e MC |
529 | } |
530 | } | |
7e159e01 | 531 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
532 | /* |
533 | * We might had to delay a close_notify alert because of reordered | |
534 | * app data. If there was an alert and there is no message to read | |
535 | * anymore, finally set shutdown. | |
536 | */ | |
537 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
538 | s->d1->shutdown_received | |
539 | && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
540 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
eda75751 | 541 | return 0; |
0f113f3e MC |
542 | } |
543 | #endif | |
02ba18a6 | 544 | *readbytes = n; |
eda75751 | 545 | return 1; |
0f113f3e MC |
546 | } |
547 | ||
548 | /* | |
549 | * If we get here, then type != rr->type; if we have a handshake message, | |
550 | * then it was unexpected (Hello Request or Client Hello). | |
551 | */ | |
552 | ||
bd990e25 MC |
553 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) { |
554 | unsigned int alert_level, alert_descr; | |
555 | unsigned char *alert_bytes = SSL3_RECORD_get_data(rr) | |
556 | + SSL3_RECORD_get_off(rr); | |
557 | PACKET alert; | |
0f113f3e | 558 | |
bd990e25 MC |
559 | if (!PACKET_buf_init(&alert, alert_bytes, SSL3_RECORD_get_length(rr)) |
560 | || !PACKET_get_1(&alert, &alert_level) | |
561 | || !PACKET_get_1(&alert, &alert_descr) | |
562 | || PACKET_remaining(&alert) != 0) { | |
c2853382 MC |
563 | SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES, |
564 | SSL_R_INVALID_ALERT); | |
565 | return -1; | |
0f113f3e MC |
566 | } |
567 | ||
0f113f3e | 568 | if (s->msg_callback) |
bd990e25 | 569 | s->msg_callback(0, s->version, SSL3_RT_ALERT, alert_bytes, 2, s, |
c661ac16 | 570 | s->msg_callback_arg); |
0f113f3e MC |
571 | |
572 | if (s->info_callback != NULL) | |
573 | cb = s->info_callback; | |
574 | else if (s->ctx->info_callback != NULL) | |
575 | cb = s->ctx->info_callback; | |
576 | ||
577 | if (cb != NULL) { | |
578 | j = (alert_level << 8) | alert_descr; | |
579 | cb(s, SSL_CB_READ_ALERT, j); | |
580 | } | |
581 | ||
fd865cad | 582 | if (alert_level == SSL3_AL_WARNING) { |
555cbb32 | 583 | s->s3.warn_alert = alert_descr; |
66fab923 | 584 | SSL3_RECORD_set_read(rr); |
af58be76 MC |
585 | |
586 | s->rlayer.alert_count++; | |
587 | if (s->rlayer.alert_count == MAX_WARN_ALERT_COUNT) { | |
c2853382 MC |
588 | SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES, |
589 | SSL_R_TOO_MANY_WARN_ALERTS); | |
590 | return -1; | |
af58be76 MC |
591 | } |
592 | ||
0f113f3e | 593 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) { |
7e159e01 | 594 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
595 | /* |
596 | * With SCTP and streams the socket may deliver app data | |
597 | * after a close_notify alert. We have to check this first so | |
598 | * that nothing gets discarded. | |
599 | */ | |
600 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
601 | BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
602 | s->d1->shutdown_received = 1; | |
603 | s->rwstate = SSL_READING; | |
604 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
605 | BIO_set_retry_read(SSL_get_rbio(s)); | |
606 | return -1; | |
607 | } | |
7e159e01 | 608 | #endif |
0f113f3e | 609 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; |
eda75751 | 610 | return 0; |
0f113f3e | 611 | } |
fd865cad | 612 | } else if (alert_level == SSL3_AL_FATAL) { |
0f113f3e MC |
613 | char tmp[16]; |
614 | ||
615 | s->rwstate = SSL_NOTHING; | |
555cbb32 | 616 | s->s3.fatal_alert = alert_descr; |
c2853382 MC |
617 | SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_DTLS1_READ_BYTES, |
618 | SSL_AD_REASON_OFFSET + alert_descr); | |
619 | BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr); | |
0f113f3e MC |
620 | ERR_add_error_data(2, "SSL alert number ", tmp); |
621 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
66fab923 | 622 | SSL3_RECORD_set_read(rr); |
e2bb9b9b | 623 | SSL_CTX_remove_session(s->session_ctx, s->session); |
eda75751 | 624 | return 0; |
0f113f3e | 625 | } else { |
c2853382 MC |
626 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_DTLS1_READ_BYTES, |
627 | SSL_R_UNKNOWN_ALERT_TYPE); | |
628 | return -1; | |
0f113f3e MC |
629 | } |
630 | ||
631 | goto start; | |
632 | } | |
633 | ||
634 | if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a | |
635 | * shutdown */ | |
636 | s->rwstate = SSL_NOTHING; | |
747e1639 | 637 | SSL3_RECORD_set_length(rr, 0); |
66fab923 | 638 | SSL3_RECORD_set_read(rr); |
eda75751 | 639 | return 0; |
0f113f3e MC |
640 | } |
641 | ||
747e1639 | 642 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
643 | /* |
644 | * We can't process a CCS now, because previous handshake messages | |
645 | * are still missing, so just drop it. | |
646 | */ | |
c69f2adf | 647 | SSL3_RECORD_set_length(rr, 0); |
66fab923 | 648 | SSL3_RECORD_set_read(rr); |
0f113f3e MC |
649 | goto start; |
650 | } | |
651 | ||
652 | /* | |
653 | * Unexpected handshake message (Client Hello, or protocol violation) | |
654 | */ | |
bd990e25 MC |
655 | if ((SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) && |
656 | !ossl_statem_get_in_handshake(s)) { | |
0f113f3e MC |
657 | struct hm_header_st msg_hdr; |
658 | ||
bd990e25 MC |
659 | /* |
660 | * This may just be a stale retransmit. Also sanity check that we have | |
661 | * at least enough record bytes for a message header | |
662 | */ | |
663 | if (SSL3_RECORD_get_epoch(rr) != s->rlayer.d->r_epoch | |
664 | || SSL3_RECORD_get_length(rr) < DTLS1_HM_HEADER_LENGTH) { | |
747e1639 | 665 | SSL3_RECORD_set_length(rr, 0); |
66fab923 | 666 | SSL3_RECORD_set_read(rr); |
0f113f3e MC |
667 | goto start; |
668 | } | |
669 | ||
bd990e25 MC |
670 | dtls1_get_message_header(rr->data, &msg_hdr); |
671 | ||
0f113f3e MC |
672 | /* |
673 | * If we are server, we may have a repeated FINISHED of the client | |
674 | * here, then retransmit our CCS and FINISHED. | |
675 | */ | |
676 | if (msg_hdr.type == SSL3_MT_FINISHED) { | |
c2853382 MC |
677 | if (dtls1_check_timeout_num(s) < 0) { |
678 | /* SSLfatal) already called */ | |
0f113f3e | 679 | return -1; |
c2853382 | 680 | } |
0f113f3e | 681 | |
d273b60b MC |
682 | if (dtls1_retransmit_buffered_messages(s) <= 0) { |
683 | /* Fail if we encountered a fatal error */ | |
684 | if (ossl_statem_in_error(s)) | |
685 | return -1; | |
d273b60b | 686 | } |
747e1639 | 687 | SSL3_RECORD_set_length(rr, 0); |
66fab923 | 688 | SSL3_RECORD_set_read(rr); |
ad962252 MC |
689 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { |
690 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { | |
691 | /* no read-ahead left? */ | |
692 | BIO *bio; | |
693 | ||
694 | s->rwstate = SSL_READING; | |
695 | bio = SSL_get_rbio(s); | |
696 | BIO_clear_retry_flags(bio); | |
697 | BIO_set_retry_read(bio); | |
698 | return -1; | |
699 | } | |
700 | } | |
0f113f3e MC |
701 | goto start; |
702 | } | |
703 | ||
c7f47786 MC |
704 | /* |
705 | * To get here we must be trying to read app data but found handshake | |
706 | * data. But if we're trying to read app data, and we're not in init | |
707 | * (which is tested for at the top of this function) then init must be | |
708 | * finished | |
709 | */ | |
b77f3ed1 | 710 | if (!ossl_assert(SSL_is_init_finished(s))) { |
c2853382 MC |
711 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DTLS1_READ_BYTES, |
712 | ERR_R_INTERNAL_ERROR); | |
713 | return -1; | |
0f113f3e | 714 | } |
c7f47786 MC |
715 | |
716 | /* We found handshake data, so we're going back into init */ | |
717 | ossl_statem_set_in_init(s, 1); | |
718 | ||
0f113f3e | 719 | i = s->handshake_func(s); |
c2853382 | 720 | /* SSLfatal() called if appropriate */ |
0f113f3e | 721 | if (i < 0) |
eda75751 | 722 | return i; |
c2853382 | 723 | if (i == 0) |
eda75751 | 724 | return -1; |
0f113f3e MC |
725 | |
726 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 727 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 728 | /* no read-ahead left? */ |
0f113f3e MC |
729 | BIO *bio; |
730 | /* | |
731 | * In the case where we try to read application data, but we | |
732 | * trigger an SSL handshake, we return -1 with the retry | |
733 | * option set. Otherwise renegotiation may cause nasty | |
734 | * problems in the blocking world | |
735 | */ | |
736 | s->rwstate = SSL_READING; | |
737 | bio = SSL_get_rbio(s); | |
738 | BIO_clear_retry_flags(bio); | |
739 | BIO_set_retry_read(bio); | |
eda75751 | 740 | return -1; |
0f113f3e MC |
741 | } |
742 | } | |
743 | goto start; | |
744 | } | |
745 | ||
747e1639 | 746 | switch (SSL3_RECORD_get_type(rr)) { |
0f113f3e | 747 | default: |
c2853382 MC |
748 | SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES, |
749 | SSL_R_UNEXPECTED_RECORD); | |
750 | return -1; | |
0f113f3e MC |
751 | case SSL3_RT_CHANGE_CIPHER_SPEC: |
752 | case SSL3_RT_ALERT: | |
753 | case SSL3_RT_HANDSHAKE: | |
754 | /* | |
755 | * we already handled all of these, with the possible exception of | |
024f543c MC |
756 | * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but |
757 | * that should not happen when type != rr->type | |
0f113f3e | 758 | */ |
c2853382 MC |
759 | SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES, |
760 | ERR_R_INTERNAL_ERROR); | |
761 | return -1; | |
0f113f3e MC |
762 | case SSL3_RT_APPLICATION_DATA: |
763 | /* | |
764 | * At this point, we were expecting handshake data, but have | |
765 | * application data. If the library was running inside ssl3_read() | |
766 | * (i.e. in_read_app_data is set) and it makes sense to read | |
767 | * application data at this point (session renegotiation not yet | |
768 | * started), we will indulge it. | |
769 | */ | |
555cbb32 TS |
770 | if (s->s3.in_read_app_data && |
771 | (s->s3.total_renegotiations != 0) && | |
fe3a3291 | 772 | ossl_statem_app_data_allowed(s)) { |
555cbb32 | 773 | s->s3.in_read_app_data = 2; |
eda75751 | 774 | return -1; |
0f113f3e | 775 | } else { |
c2853382 MC |
776 | SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_DTLS1_READ_BYTES, |
777 | SSL_R_UNEXPECTED_RECORD); | |
778 | return -1; | |
0f113f3e MC |
779 | } |
780 | } | |
781 | /* not reached */ | |
0f113f3e MC |
782 | } |
783 | ||
0f113f3e MC |
784 | /* |
785 | * Call this to write data in records of type 'type' It will return <= 0 if | |
786 | * not all data has been sent or non-blocking IO. | |
36d16f8e | 787 | */ |
7ee8627f MC |
788 | int dtls1_write_bytes(SSL *s, int type, const void *buf, size_t len, |
789 | size_t *written) | |
0f113f3e MC |
790 | { |
791 | int i; | |
792 | ||
42bd7a16 | 793 | if (!ossl_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH)) { |
5591a613 MC |
794 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DTLS1_WRITE_BYTES, |
795 | ERR_R_INTERNAL_ERROR); | |
380a522f | 796 | return -1; |
42bd7a16 | 797 | } |
0f113f3e | 798 | s->rwstate = SSL_NOTHING; |
7ee8627f | 799 | i = do_dtls1_write(s, type, buf, len, 0, written); |
0f113f3e MC |
800 | return i; |
801 | } | |
802 | ||
803 | int do_dtls1_write(SSL *s, int type, const unsigned char *buf, | |
7ee8627f | 804 | size_t len, int create_empty_fragment, size_t *written) |
0f113f3e MC |
805 | { |
806 | unsigned char *p, *pseq; | |
807 | int i, mac_size, clear = 0; | |
7ee8627f | 808 | size_t prefix_len = 0; |
0f113f3e | 809 | int eivlen; |
f482740f | 810 | SSL3_RECORD wr; |
0f113f3e MC |
811 | SSL3_BUFFER *wb; |
812 | SSL_SESSION *sess; | |
813 | ||
d102d9df | 814 | wb = &s->rlayer.wbuf[0]; |
db9a32e7 | 815 | |
0f113f3e MC |
816 | /* |
817 | * first check if there is a SSL3_BUFFER still being written out. This | |
818 | * will happen with non blocking IO | |
819 | */ | |
380a522f | 820 | if (!ossl_assert(SSL3_BUFFER_get_left(wb) == 0)) { |
5591a613 MC |
821 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE, |
822 | ERR_R_INTERNAL_ERROR); | |
380a522f | 823 | return 0; |
0f113f3e MC |
824 | } |
825 | ||
826 | /* If we have an alert to send, lets send it */ | |
555cbb32 | 827 | if (s->s3.alert_dispatch) { |
0f113f3e MC |
828 | i = s->method->ssl_dispatch_alert(s); |
829 | if (i <= 0) | |
7ee8627f | 830 | return i; |
0f113f3e MC |
831 | /* if it went, fall through and send more stuff */ |
832 | } | |
833 | ||
834 | if (len == 0 && !create_empty_fragment) | |
835 | return 0; | |
836 | ||
cf72c757 | 837 | if (len > ssl_get_max_send_fragment(s)) { |
5591a613 MC |
838 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE, |
839 | SSL_R_EXCEEDS_MAX_FRAGMENT_SIZE); | |
aefb9256 MC |
840 | return 0; |
841 | } | |
842 | ||
0f113f3e MC |
843 | sess = s->session; |
844 | ||
845 | if ((sess == NULL) || | |
846 | (s->enc_write_ctx == NULL) || (EVP_MD_CTX_md(s->write_hash) == NULL)) | |
847 | clear = 1; | |
848 | ||
849 | if (clear) | |
850 | mac_size = 0; | |
851 | else { | |
852 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
5591a613 MC |
853 | if (mac_size < 0) { |
854 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE, | |
855 | SSL_R_EXCEEDS_MAX_FRAGMENT_SIZE); | |
856 | return -1; | |
857 | } | |
0f113f3e MC |
858 | } |
859 | ||
747e1639 | 860 | p = SSL3_BUFFER_get_buf(wb) + prefix_len; |
0f113f3e MC |
861 | |
862 | /* write the header */ | |
863 | ||
864 | *(p++) = type & 0xff; | |
f482740f | 865 | SSL3_RECORD_set_type(&wr, type); |
0f113f3e MC |
866 | /* |
867 | * Special case: for hello verify request, client version 1.0 and we | |
868 | * haven't decided which version to use yet send back using version 1.0 | |
869 | * header: otherwise some clients will ignore it. | |
870 | */ | |
032924c4 | 871 | if (s->method->version == DTLS_ANY_VERSION && |
a230b26e | 872 | s->max_proto_version != DTLS1_BAD_VER) { |
0f113f3e MC |
873 | *(p++) = DTLS1_VERSION >> 8; |
874 | *(p++) = DTLS1_VERSION & 0xff; | |
875 | } else { | |
876 | *(p++) = s->version >> 8; | |
877 | *(p++) = s->version & 0xff; | |
878 | } | |
879 | ||
880 | /* field where we are to write out packet epoch, seq num and len */ | |
881 | pseq = p; | |
882 | p += 10; | |
883 | ||
884 | /* Explicit IV length, block ciphers appropriate version flag */ | |
885 | if (s->enc_write_ctx) { | |
886 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx); | |
887 | if (mode == EVP_CIPH_CBC_MODE) { | |
888 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx); | |
889 | if (eivlen <= 1) | |
890 | eivlen = 0; | |
891 | } | |
892 | /* Need explicit part of IV for GCM mode */ | |
893 | else if (mode == EVP_CIPH_GCM_MODE) | |
894 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
e75c5a79 DSH |
895 | else if (mode == EVP_CIPH_CCM_MODE) |
896 | eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN; | |
0f113f3e MC |
897 | else |
898 | eivlen = 0; | |
899 | } else | |
900 | eivlen = 0; | |
901 | ||
902 | /* lets setup the record stuff. */ | |
f482740f | 903 | SSL3_RECORD_set_data(&wr, p + eivlen); /* make room for IV in case of CBC */ |
7ee8627f | 904 | SSL3_RECORD_set_length(&wr, len); |
f482740f | 905 | SSL3_RECORD_set_input(&wr, (unsigned char *)buf); |
0f113f3e MC |
906 | |
907 | /* | |
f482740f | 908 | * we now 'read' from wr.input, wr.length bytes into wr.data |
0f113f3e MC |
909 | */ |
910 | ||
911 | /* first we compress */ | |
912 | if (s->compress != NULL) { | |
f482740f | 913 | if (!ssl3_do_compress(s, &wr)) { |
5591a613 MC |
914 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE, |
915 | SSL_R_COMPRESSION_FAILURE); | |
916 | return -1; | |
0f113f3e MC |
917 | } |
918 | } else { | |
f482740f MC |
919 | memcpy(SSL3_RECORD_get_data(&wr), SSL3_RECORD_get_input(&wr), |
920 | SSL3_RECORD_get_length(&wr)); | |
921 | SSL3_RECORD_reset_input(&wr); | |
0f113f3e | 922 | } |
36d16f8e | 923 | |
0f113f3e | 924 | /* |
f482740f MC |
925 | * we should still have the output to wr.data and the input from |
926 | * wr.input. Length should be wr.length. wr.data still points in the | |
0f113f3e MC |
927 | * wb->buf |
928 | */ | |
36d16f8e | 929 | |
28a31a0a | 930 | if (!SSL_WRITE_ETM(s) && mac_size != 0) { |
a14aa99b MC |
931 | if (!s->method->ssl3_enc->mac(s, &wr, |
932 | &(p[SSL3_RECORD_get_length(&wr) + eivlen]), | |
5591a613 MC |
933 | 1)) { |
934 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE, | |
935 | ERR_R_INTERNAL_ERROR); | |
936 | return -1; | |
937 | } | |
f482740f | 938 | SSL3_RECORD_add_length(&wr, mac_size); |
0f113f3e | 939 | } |
36d16f8e | 940 | |
0f113f3e | 941 | /* this is true regardless of mac size */ |
f482740f MC |
942 | SSL3_RECORD_set_data(&wr, p); |
943 | SSL3_RECORD_reset_input(&wr); | |
36d16f8e | 944 | |
0f113f3e | 945 | if (eivlen) |
f482740f | 946 | SSL3_RECORD_add_length(&wr, eivlen); |
36d16f8e | 947 | |
ec27e619 | 948 | if (s->method->ssl3_enc->enc(s, &wr, 1, 1, NULL, mac_size) < 1) { |
921d84a0 MC |
949 | if (!ossl_statem_in_error(s)) { |
950 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE, | |
951 | ERR_R_INTERNAL_ERROR); | |
952 | } | |
5591a613 MC |
953 | return -1; |
954 | } | |
36d16f8e | 955 | |
28a31a0a | 956 | if (SSL_WRITE_ETM(s) && mac_size != 0) { |
a14aa99b | 957 | if (!s->method->ssl3_enc->mac(s, &wr, |
5591a613 MC |
958 | &(p[SSL3_RECORD_get_length(&wr)]), 1)) { |
959 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DO_DTLS1_WRITE, | |
960 | ERR_R_INTERNAL_ERROR); | |
961 | return -1; | |
962 | } | |
e23d5071 DW |
963 | SSL3_RECORD_add_length(&wr, mac_size); |
964 | } | |
965 | ||
0f113f3e | 966 | /* record length after mac and block padding */ |
36d16f8e | 967 | |
0f113f3e | 968 | /* there's only one epoch between handshake and app data */ |
36d16f8e | 969 | |
78a39fe7 | 970 | s2n(s->rlayer.d->w_epoch, pseq); |
36d16f8e | 971 | |
de07f311 | 972 | memcpy(pseq, &(s->rlayer.write_sequence[2]), 6); |
0f113f3e | 973 | pseq += 6; |
f482740f | 974 | s2n(SSL3_RECORD_get_length(&wr), pseq); |
36d16f8e | 975 | |
0f113f3e MC |
976 | if (s->msg_callback) |
977 | s->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH, | |
978 | DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg); | |
36d16f8e | 979 | |
0f113f3e | 980 | /* |
f482740f | 981 | * we should now have wr.data pointing to the encrypted data, which is |
0f113f3e MC |
982 | * wr->length long |
983 | */ | |
f482740f MC |
984 | SSL3_RECORD_set_type(&wr, type); /* not needed but helps for debugging */ |
985 | SSL3_RECORD_add_length(&wr, DTLS1_RT_HEADER_LENGTH); | |
36d16f8e | 986 | |
de07f311 | 987 | ssl3_record_sequence_update(&(s->rlayer.write_sequence[0])); |
36d16f8e | 988 | |
0f113f3e MC |
989 | if (create_empty_fragment) { |
990 | /* | |
991 | * we are in a recursive call; just return the length, don't write | |
992 | * out anything here | |
993 | */ | |
7ee8627f MC |
994 | *written = wr.length; |
995 | return 1; | |
0f113f3e | 996 | } |
36d16f8e | 997 | |
0f113f3e | 998 | /* now let's set up wb */ |
f482740f | 999 | SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(&wr)); |
747e1639 | 1000 | SSL3_BUFFER_set_offset(wb, 0); |
0f113f3e MC |
1001 | |
1002 | /* | |
1003 | * memorize arguments so that ssl3_write_pending can detect bad write | |
1004 | * retries later | |
1005 | */ | |
f8caa3c8 MC |
1006 | s->rlayer.wpend_tot = len; |
1007 | s->rlayer.wpend_buf = buf; | |
1008 | s->rlayer.wpend_type = type; | |
1009 | s->rlayer.wpend_ret = len; | |
0f113f3e | 1010 | |
c2853382 | 1011 | /* we now just need to write the buffer. Calls SSLfatal() as required. */ |
7ee8627f | 1012 | return ssl3_write_pending(s, type, buf, len, written); |
0f113f3e | 1013 | } |
36d16f8e | 1014 | |
fe589e61 | 1015 | DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, |
a230b26e | 1016 | unsigned int *is_next_epoch) |
0f113f3e MC |
1017 | { |
1018 | ||
36d16f8e BL |
1019 | *is_next_epoch = 0; |
1020 | ||
1021 | /* In current epoch, accept HM, CCS, DATA, & ALERT */ | |
78a39fe7 | 1022 | if (rr->epoch == s->rlayer.d->r_epoch) |
91f93f69 | 1023 | return &s->rlayer.d->bitmap; |
36d16f8e | 1024 | |
738ad946 MC |
1025 | /* |
1026 | * Only HM and ALERT messages can be from the next epoch and only if we | |
1027 | * have already processed all of the unprocessed records from the last | |
1028 | * epoch | |
1029 | */ | |
78a39fe7 | 1030 | else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) && |
738ad946 | 1031 | s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch && |
a230b26e | 1032 | (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) { |
36d16f8e | 1033 | *is_next_epoch = 1; |
91f93f69 | 1034 | return &s->rlayer.d->next_bitmap; |
0f113f3e | 1035 | } |
36d16f8e BL |
1036 | |
1037 | return NULL; | |
0f113f3e | 1038 | } |
36d16f8e | 1039 | |
0f113f3e MC |
1040 | void dtls1_reset_seq_numbers(SSL *s, int rw) |
1041 | { | |
1042 | unsigned char *seq; | |
de07f311 | 1043 | unsigned int seq_bytes = sizeof(s->rlayer.read_sequence); |
0f113f3e MC |
1044 | |
1045 | if (rw & SSL3_CC_READ) { | |
de07f311 | 1046 | seq = s->rlayer.read_sequence; |
78a39fe7 | 1047 | s->rlayer.d->r_epoch++; |
16f8d4eb RS |
1048 | memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap, |
1049 | sizeof(s->rlayer.d->bitmap)); | |
a230b26e | 1050 | memset(&s->rlayer.d->next_bitmap, 0, sizeof(s->rlayer.d->next_bitmap)); |
5cb4d646 MC |
1051 | |
1052 | /* | |
1053 | * We must not use any buffered messages received from the previous | |
1054 | * epoch | |
1055 | */ | |
1056 | dtls1_clear_received_buffer(s); | |
0f113f3e | 1057 | } else { |
de07f311 | 1058 | seq = s->rlayer.write_sequence; |
3bb8f87d | 1059 | memcpy(s->rlayer.d->last_write_sequence, seq, |
de07f311 | 1060 | sizeof(s->rlayer.write_sequence)); |
78a39fe7 | 1061 | s->rlayer.d->w_epoch++; |
0f113f3e MC |
1062 | } |
1063 | ||
16f8d4eb | 1064 | memset(seq, 0, seq_bytes); |
0f113f3e | 1065 | } |