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Commit | Line | Data |
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0f113f3e | 1 | /* |
4333b89f | 2 | * Copyright 2005-2021 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 | 23 | if ((d = OPENSSL_malloc(sizeof(*d))) == NULL) { |
6849b73c | 24 | ERR_raise(ERR_LIB_SSL, 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 | { | |
d0afb30e MC |
49 | if (rl->d == NULL) |
50 | return; | |
51 | ||
cb2ce7ab MC |
52 | DTLS_RECORD_LAYER_clear(rl); |
53 | pqueue_free(rl->d->unprocessed_rcds.q); | |
54 | pqueue_free(rl->d->processed_rcds.q); | |
24a1e2f2 | 55 | pqueue_free(rl->d->buffered_app_data.q); |
40f37188 MC |
56 | OPENSSL_free(rl->d); |
57 | rl->d = NULL; | |
58 | } | |
59 | ||
60 | void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl) | |
61 | { | |
62 | DTLS_RECORD_LAYER *d; | |
cb2ce7ab MC |
63 | pitem *item = NULL; |
64 | DTLS1_RECORD_DATA *rdata; | |
cf2cede4 RS |
65 | pqueue *unprocessed_rcds; |
66 | pqueue *processed_rcds; | |
67 | pqueue *buffered_app_data; | |
cb2ce7ab | 68 | |
40f37188 | 69 | d = rl->d; |
0485d540 | 70 | |
cb2ce7ab MC |
71 | while ((item = pqueue_pop(d->unprocessed_rcds.q)) != NULL) { |
72 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
b548a1f1 | 73 | OPENSSL_free(rdata->rbuf.buf); |
cb2ce7ab MC |
74 | OPENSSL_free(item->data); |
75 | pitem_free(item); | |
76 | } | |
77 | ||
78 | while ((item = pqueue_pop(d->processed_rcds.q)) != NULL) { | |
79 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
163b8016 ME |
80 | if (rl->s->options & SSL_OP_CLEANSE_PLAINTEXT) |
81 | OPENSSL_cleanse(rdata->rbuf.buf, rdata->rbuf.len); | |
b548a1f1 | 82 | OPENSSL_free(rdata->rbuf.buf); |
cb2ce7ab MC |
83 | OPENSSL_free(item->data); |
84 | pitem_free(item); | |
85 | } | |
86 | ||
24a1e2f2 MC |
87 | while ((item = pqueue_pop(d->buffered_app_data.q)) != NULL) { |
88 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
163b8016 ME |
89 | if (rl->s->options & SSL_OP_CLEANSE_PLAINTEXT) |
90 | OPENSSL_cleanse(rdata->rbuf.buf, rdata->rbuf.len); | |
b548a1f1 | 91 | OPENSSL_free(rdata->rbuf.buf); |
24a1e2f2 MC |
92 | OPENSSL_free(item->data); |
93 | pitem_free(item); | |
94 | } | |
95 | ||
cb2ce7ab MC |
96 | unprocessed_rcds = d->unprocessed_rcds.q; |
97 | processed_rcds = d->processed_rcds.q; | |
24a1e2f2 | 98 | buffered_app_data = d->buffered_app_data.q; |
b4faea50 | 99 | memset(d, 0, sizeof(*d)); |
cb2ce7ab MC |
100 | d->unprocessed_rcds.q = unprocessed_rcds; |
101 | d->processed_rcds.q = processed_rcds; | |
24a1e2f2 | 102 | d->buffered_app_data.q = buffered_app_data; |
40f37188 MC |
103 | } |
104 | ||
3bb8f87d MC |
105 | void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e) |
106 | { | |
107 | if (e == rl->d->w_epoch - 1) { | |
108 | memcpy(rl->d->curr_write_sequence, | |
a230b26e | 109 | rl->write_sequence, sizeof(rl->write_sequence)); |
3bb8f87d | 110 | memcpy(rl->write_sequence, |
a230b26e | 111 | rl->d->last_write_sequence, sizeof(rl->write_sequence)); |
3bb8f87d MC |
112 | } else if (e == rl->d->w_epoch + 1) { |
113 | memcpy(rl->d->last_write_sequence, | |
a230b26e | 114 | rl->write_sequence, sizeof(unsigned char[8])); |
3bb8f87d | 115 | memcpy(rl->write_sequence, |
a230b26e | 116 | rl->d->curr_write_sequence, sizeof(rl->write_sequence)); |
3bb8f87d MC |
117 | } |
118 | rl->d->w_epoch = e; | |
119 | } | |
120 | ||
e3d0dae7 MC |
121 | void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq) |
122 | { | |
123 | memcpy(rl->write_sequence, seq, SEQ_NUM_SIZE); | |
124 | } | |
125 | ||
36d16f8e | 126 | /* copy buffered record into SSL structure */ |
38b051a1 | 127 | static int dtls1_copy_record(SSL_CONNECTION *s, pitem *item) |
0f113f3e | 128 | { |
36d16f8e BL |
129 | DTLS1_RECORD_DATA *rdata; |
130 | ||
131 | rdata = (DTLS1_RECORD_DATA *)item->data; | |
0f113f3e | 132 | |
e2d5742b | 133 | SSL3_BUFFER_release(s->rrlmethod->get0_rbuf(s->rrl)); |
0f113f3e | 134 | |
e2d5742b MC |
135 | s->rrlmethod->set0_packet(s->rrl, rdata->packet, rdata->packet_length); |
136 | memcpy(s->rrlmethod->get0_rbuf(s->rrl), &(rdata->rbuf), sizeof(SSL3_BUFFER)); | |
88c23039 | 137 | memcpy(&s->rlayer.rrec, &(rdata->rrec), sizeof(SSL3_RECORD)); |
36d16f8e | 138 | |
0f113f3e | 139 | /* Set proper sequence number for mac calculation */ |
de07f311 | 140 | memcpy(&(s->rlayer.read_sequence[2]), &(rdata->packet[5]), 6); |
0f113f3e | 141 | |
208fb891 | 142 | return 1; |
0f113f3e | 143 | } |
36d16f8e | 144 | |
38b051a1 TM |
145 | int dtls1_buffer_record(SSL_CONNECTION *s, record_pqueue *queue, |
146 | unsigned char *priority) | |
0f113f3e MC |
147 | { |
148 | DTLS1_RECORD_DATA *rdata; | |
149 | pitem *item; | |
38b051a1 TM |
150 | #ifndef OPENSSL_NO_SCTP |
151 | SSL *ssl = SSL_CONNECTION_GET_SSL(s); | |
152 | #endif | |
0f113f3e MC |
153 | |
154 | /* Limit the size of the queue to prevent DOS attacks */ | |
155 | if (pqueue_size(queue->q) >= 100) | |
156 | return 0; | |
157 | ||
b4faea50 | 158 | rdata = OPENSSL_malloc(sizeof(*rdata)); |
0f113f3e MC |
159 | item = pitem_new(priority, rdata); |
160 | if (rdata == NULL || item == NULL) { | |
b548a1f1 | 161 | OPENSSL_free(rdata); |
25aaa98a | 162 | pitem_free(item); |
c48ffbcc | 163 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
06c6a2b4 | 164 | return -1; |
0f113f3e MC |
165 | } |
166 | ||
e2d5742b MC |
167 | rdata->packet = s->rrlmethod->get0_packet(s->rrl); |
168 | rdata->packet_length = s->rrlmethod->get_packet_length(s->rrl); | |
169 | memcpy(&(rdata->rbuf), s->rrlmethod->get0_rbuf(s->rrl), sizeof(SSL3_BUFFER)); | |
88c23039 | 170 | memcpy(&(rdata->rrec), &s->rlayer.rrec, sizeof(SSL3_RECORD)); |
0f113f3e MC |
171 | |
172 | item->data = rdata; | |
36d16f8e | 173 | |
7e159e01 | 174 | #ifndef OPENSSL_NO_SCTP |
0f113f3e | 175 | /* Store bio_dgram_sctp_rcvinfo struct */ |
38b051a1 TM |
176 | if (BIO_dgram_is_sctp(SSL_get_rbio(ssl)) && |
177 | (SSL_get_state(ssl) == TLS_ST_SR_FINISHED | |
178 | || SSL_get_state(ssl) == TLS_ST_CR_FINISHED)) { | |
179 | BIO_ctrl(SSL_get_rbio(ssl), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO, | |
0f113f3e MC |
180 | sizeof(rdata->recordinfo), &rdata->recordinfo); |
181 | } | |
7e159e01 DSH |
182 | #endif |
183 | ||
e2d5742b MC |
184 | s->rrlmethod->set0_packet(s->rrl, NULL, 0); |
185 | memset(s->rrlmethod->get0_rbuf(s->rrl), 0, sizeof(SSL3_BUFFER)); | |
16f8d4eb | 186 | memset(&s->rlayer.rrec, 0, sizeof(s->rlayer.rrec)); |
0f113f3e MC |
187 | |
188 | if (!ssl3_setup_buffers(s)) { | |
c2853382 | 189 | /* SSLfatal() already called */ |
b548a1f1 | 190 | OPENSSL_free(rdata->rbuf.buf); |
0f113f3e MC |
191 | OPENSSL_free(rdata); |
192 | pitem_free(item); | |
26a7d938 | 193 | return -1; |
0f113f3e | 194 | } |
36d16f8e | 195 | |
0f113f3e | 196 | if (pqueue_insert(queue->q, item) == NULL) { |
840facc3 | 197 | /* Must be a duplicate so ignore it */ |
b548a1f1 | 198 | OPENSSL_free(rdata->rbuf.buf); |
0f113f3e MC |
199 | OPENSSL_free(rdata); |
200 | pitem_free(item); | |
0f113f3e | 201 | } |
36d16f8e | 202 | |
208fb891 | 203 | return 1; |
0f113f3e MC |
204 | } |
205 | ||
38b051a1 | 206 | int dtls1_retrieve_buffered_record(SSL_CONNECTION *s, record_pqueue *queue) |
0f113f3e | 207 | { |
36d16f8e BL |
208 | pitem *item; |
209 | ||
210 | item = pqueue_pop(queue->q); | |
0f113f3e | 211 | if (item) { |
36d16f8e BL |
212 | dtls1_copy_record(s, item); |
213 | ||
214 | OPENSSL_free(item->data); | |
0f113f3e | 215 | pitem_free(item); |
36d16f8e | 216 | |
208fb891 | 217 | return 1; |
36d16f8e BL |
218 | } |
219 | ||
26a7d938 | 220 | return 0; |
0f113f3e | 221 | } |
36d16f8e | 222 | |
0f113f3e MC |
223 | /* |
224 | * retrieve a buffered record that belongs to the new epoch, i.e., not | |
225 | * processed yet | |
226 | */ | |
36d16f8e BL |
227 | #define dtls1_get_unprocessed_record(s) \ |
228 | dtls1_retrieve_buffered_record((s), \ | |
cb2ce7ab | 229 | &((s)->rlayer.d->unprocessed_rcds)) |
36d16f8e | 230 | |
38b051a1 | 231 | int dtls1_process_buffered_records(SSL_CONNECTION *s) |
0f113f3e | 232 | { |
36d16f8e | 233 | pitem *item; |
738ad946 | 234 | SSL3_BUFFER *rb; |
1fb9fdc3 MC |
235 | SSL3_RECORD *rr; |
236 | DTLS1_BITMAP *bitmap; | |
237 | unsigned int is_next_epoch; | |
238 | int replayok = 1; | |
0f113f3e | 239 | |
cb2ce7ab | 240 | item = pqueue_peek(s->rlayer.d->unprocessed_rcds.q); |
0f113f3e | 241 | if (item) { |
36d16f8e | 242 | /* Check if epoch is current. */ |
cb2ce7ab | 243 | if (s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch) |
1fb9fdc3 MC |
244 | return 1; /* Nothing to do. */ |
245 | ||
246 | rr = RECORD_LAYER_get_rrec(&s->rlayer); | |
0f113f3e | 247 | |
e2d5742b | 248 | rb = s->rrlmethod->get0_rbuf(s->rrl); |
738ad946 MC |
249 | |
250 | if (SSL3_BUFFER_get_left(rb) > 0) { | |
251 | /* | |
252 | * We've still got data from the current packet to read. There could | |
253 | * be a record from the new epoch in it - so don't overwrite it | |
254 | * with the unprocessed records yet (we'll do it when we've | |
255 | * finished reading the current packet). | |
256 | */ | |
257 | return 1; | |
258 | } | |
259 | ||
36d16f8e | 260 | /* Process all the records. */ |
cb2ce7ab | 261 | while (pqueue_peek(s->rlayer.d->unprocessed_rcds.q)) { |
36d16f8e | 262 | dtls1_get_unprocessed_record(s); |
1fb9fdc3 MC |
263 | bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch); |
264 | if (bitmap == NULL) { | |
265 | /* | |
266 | * Should not happen. This will only ever be NULL when the | |
267 | * current record is from a different epoch. But that cannot | |
268 | * be the case because we already checked the epoch above | |
269 | */ | |
c48ffbcc | 270 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
1fb9fdc3 MC |
271 | return 0; |
272 | } | |
273 | #ifndef OPENSSL_NO_SCTP | |
274 | /* Only do replay check if no SCTP bio */ | |
38b051a1 | 275 | if (!BIO_dgram_is_sctp(SSL_get_rbio(SSL_CONNECTION_GET_SSL(s)))) |
1fb9fdc3 MC |
276 | #endif |
277 | { | |
278 | /* | |
279 | * Check whether this is a repeat, or aged record. We did this | |
280 | * check once already when we first received the record - but | |
281 | * we might have updated the window since then due to | |
282 | * records we subsequently processed. | |
283 | */ | |
284 | replayok = dtls1_record_replay_check(s, bitmap); | |
285 | } | |
286 | ||
287 | if (!replayok || !dtls1_process_record(s, bitmap)) { | |
c2853382 MC |
288 | if (ossl_statem_in_error(s)) { |
289 | /* dtls1_process_record called SSLfatal() */ | |
639e5760 | 290 | return 0; |
c2853382 | 291 | } |
1fb9fdc3 MC |
292 | /* dump this record */ |
293 | rr->length = 0; | |
e2d5742b | 294 | s->rrlmethod->reset_packet_length(s->rrl); |
1fb9fdc3 MC |
295 | continue; |
296 | } | |
297 | ||
cb2ce7ab | 298 | if (dtls1_buffer_record(s, &(s->rlayer.d->processed_rcds), |
c2853382 MC |
299 | SSL3_RECORD_get_seq_num(s->rlayer.rrec)) < 0) { |
300 | /* SSLfatal() already called */ | |
1fb9fdc3 | 301 | return 0; |
c2853382 | 302 | } |
36d16f8e | 303 | } |
0f113f3e | 304 | } |
36d16f8e | 305 | |
0f113f3e MC |
306 | /* |
307 | * sync epoch numbers once all the unprocessed records have been | |
308 | * processed | |
309 | */ | |
cb2ce7ab MC |
310 | s->rlayer.d->processed_rcds.epoch = s->rlayer.d->r_epoch; |
311 | s->rlayer.d->unprocessed_rcds.epoch = s->rlayer.d->r_epoch + 1; | |
36d16f8e | 312 | |
1fb9fdc3 | 313 | return 1; |
0f113f3e | 314 | } |
36d16f8e | 315 | |
1d97c843 TH |
316 | /*- |
317 | * Return up to 'len' payload bytes received in 'type' records. | |
36d16f8e BL |
318 | * 'type' is one of the following: |
319 | * | |
320 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
321 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
322 | * - 0 (during a shutdown, no data has to be returned) | |
323 | * | |
324 | * If we don't have stored data to work from, read a SSL/TLS record first | |
325 | * (possibly multiple records if we still don't have anything to return). | |
326 | * | |
327 | * This function must handle any surprises the peer may have for us, such as | |
c69f2adf MC |
328 | * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec |
329 | * messages are treated as if they were handshake messages *if* the |recd_type| | |
330 | * argument is non NULL. | |
36d16f8e BL |
331 | * Also if record payloads contain fragments too small to process, we store |
332 | * them until there is enough for the respective protocol (the record protocol | |
333 | * may use arbitrary fragmentation and even interleaving): | |
334 | * Change cipher spec protocol | |
335 | * just 1 byte needed, no need for keeping anything stored | |
336 | * Alert protocol | |
337 | * 2 bytes needed (AlertLevel, AlertDescription) | |
338 | * Handshake protocol | |
339 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
340 | * to detect unexpected Client Hello and Hello Request messages | |
341 | * here, anything else is handled by higher layers | |
342 | * Application data protocol | |
343 | * none of our business | |
344 | */ | |
657da85e | 345 | int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf, |
02ba18a6 | 346 | size_t len, int peek, size_t *readbytes) |
0f113f3e | 347 | { |
c2853382 | 348 | int i, j, iret; |
bd990e25 | 349 | size_t n; |
0f113f3e MC |
350 | SSL3_RECORD *rr; |
351 | void (*cb) (const SSL *ssl, int type2, int val) = NULL; | |
38b051a1 TM |
352 | SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s); |
353 | ||
354 | if (sc == NULL) | |
355 | return -1; | |
0f113f3e | 356 | |
e2d5742b | 357 | if (!SSL3_BUFFER_is_initialised(sc->rrlmethod->get0_rbuf(sc->rrl))) { |
28d59af8 | 358 | /* Not initialized yet */ |
38b051a1 | 359 | if (!ssl3_setup_buffers(sc)) { |
c2853382 | 360 | /* SSLfatal() already called */ |
26a7d938 | 361 | return -1; |
c2853382 | 362 | } |
28d59af8 | 363 | } |
0f113f3e MC |
364 | |
365 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && | |
366 | (type != SSL3_RT_HANDSHAKE)) || | |
367 | (peek && (type != SSL3_RT_APPLICATION_DATA))) { | |
38b051a1 | 368 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
369 | return -1; |
370 | } | |
371 | ||
38b051a1 | 372 | if (!ossl_statem_get_in_handshake(sc) && SSL_in_init(s)) { |
0f113f3e | 373 | /* type == SSL3_RT_APPLICATION_DATA */ |
38b051a1 | 374 | i = sc->handshake_func(s); |
c2853382 | 375 | /* SSLfatal() already called if appropriate */ |
0f113f3e | 376 | if (i < 0) |
eda75751 | 377 | return i; |
c2853382 | 378 | if (i == 0) |
eda75751 | 379 | return -1; |
0f113f3e MC |
380 | } |
381 | ||
382 | start: | |
38b051a1 | 383 | sc->rwstate = SSL_NOTHING; |
0f113f3e | 384 | |
50e735f9 | 385 | /*- |
555cbb32 TS |
386 | * s->s3.rrec.type - is the type of record |
387 | * s->s3.rrec.data, - data | |
388 | * s->s3.rrec.off, - offset into 'data' for next read | |
389 | * s->s3.rrec.length, - number of bytes. | |
50e735f9 | 390 | */ |
38b051a1 | 391 | rr = sc->rlayer.rrec; |
0f113f3e MC |
392 | |
393 | /* | |
394 | * We are not handshaking and have no data yet, so process data buffered | |
395 | * during the last handshake in advance, if any. | |
396 | */ | |
49ae7423 | 397 | if (SSL_is_init_finished(s) && SSL3_RECORD_get_length(rr) == 0) { |
0f113f3e | 398 | pitem *item; |
38b051a1 | 399 | item = pqueue_pop(sc->rlayer.d->buffered_app_data.q); |
0f113f3e | 400 | if (item) { |
7e159e01 | 401 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
402 | /* Restore bio_dgram_sctp_rcvinfo struct */ |
403 | if (BIO_dgram_is_sctp(SSL_get_rbio(s))) { | |
404 | DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *)item->data; | |
405 | BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO, | |
406 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
407 | } | |
7e159e01 DSH |
408 | #endif |
409 | ||
38b051a1 | 410 | dtls1_copy_record(sc, item); |
0f113f3e MC |
411 | |
412 | OPENSSL_free(item->data); | |
413 | pitem_free(item); | |
414 | } | |
415 | } | |
416 | ||
417 | /* Check for timeout */ | |
38b051a1 | 418 | if (dtls1_handle_timeout(sc) > 0) { |
0f113f3e | 419 | goto start; |
38b051a1 | 420 | } else if (ossl_statem_in_error(sc)) { |
d273b60b MC |
421 | /* dtls1_handle_timeout() has failed with a fatal error */ |
422 | return -1; | |
423 | } | |
0f113f3e MC |
424 | |
425 | /* get new packet if necessary */ | |
747e1639 | 426 | if ((SSL3_RECORD_get_length(rr) == 0) |
38b051a1 TM |
427 | || (sc->rlayer.rstate == SSL_ST_READ_BODY)) { |
428 | RECORD_LAYER_set_numrpipes(&sc->rlayer, 0); | |
429 | iret = dtls1_get_record(sc); | |
eda75751 | 430 | if (iret <= 0) { |
38b051a1 | 431 | iret = dtls1_read_failed(sc, iret); |
c2853382 MC |
432 | /* |
433 | * Anything other than a timeout is an error. SSLfatal() already | |
434 | * called if appropriate. | |
435 | */ | |
eda75751 MC |
436 | if (iret <= 0) |
437 | return iret; | |
0f113f3e MC |
438 | else |
439 | goto start; | |
440 | } | |
38b051a1 | 441 | RECORD_LAYER_set_numrpipes(&sc->rlayer, 1); |
0f113f3e MC |
442 | } |
443 | ||
af58be76 MC |
444 | /* |
445 | * Reset the count of consecutive warning alerts if we've got a non-empty | |
446 | * record that isn't an alert. | |
447 | */ | |
448 | if (SSL3_RECORD_get_type(rr) != SSL3_RT_ALERT | |
449 | && SSL3_RECORD_get_length(rr) != 0) | |
38b051a1 | 450 | sc->rlayer.alert_count = 0; |
af58be76 | 451 | |
0f113f3e MC |
452 | /* we now have a packet which can be read and processed */ |
453 | ||
38b051a1 | 454 | if (sc->s3.change_cipher_spec /* set when we receive ChangeCipherSpec, |
555cbb32 | 455 | * reset by ssl3_get_finished */ |
747e1639 | 456 | && (SSL3_RECORD_get_type(rr) != SSL3_RT_HANDSHAKE)) { |
0f113f3e MC |
457 | /* |
458 | * We now have application data between CCS and Finished. Most likely | |
459 | * the packets were reordered on their way, so buffer the application | |
460 | * data for later processing rather than dropping the connection. | |
461 | */ | |
38b051a1 | 462 | if (dtls1_buffer_record(sc, &(sc->rlayer.d->buffered_app_data), |
a230b26e | 463 | SSL3_RECORD_get_seq_num(rr)) < 0) { |
c2853382 | 464 | /* SSLfatal() already called */ |
0f113f3e MC |
465 | return -1; |
466 | } | |
747e1639 | 467 | SSL3_RECORD_set_length(rr, 0); |
66fab923 | 468 | SSL3_RECORD_set_read(rr); |
0f113f3e MC |
469 | goto start; |
470 | } | |
471 | ||
472 | /* | |
473 | * If the other end has shut down, throw anything we read away (even in | |
474 | * 'peek' mode) | |
475 | */ | |
38b051a1 | 476 | if (sc->shutdown & SSL_RECEIVED_SHUTDOWN) { |
747e1639 | 477 | SSL3_RECORD_set_length(rr, 0); |
66fab923 | 478 | SSL3_RECORD_set_read(rr); |
38b051a1 | 479 | sc->rwstate = SSL_NOTHING; |
eda75751 | 480 | return 0; |
0f113f3e MC |
481 | } |
482 | ||
c69f2adf | 483 | if (type == SSL3_RECORD_get_type(rr) |
a230b26e EK |
484 | || (SSL3_RECORD_get_type(rr) == SSL3_RT_CHANGE_CIPHER_SPEC |
485 | && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) { | |
c69f2adf MC |
486 | /* |
487 | * SSL3_RT_APPLICATION_DATA or | |
488 | * SSL3_RT_HANDSHAKE or | |
489 | * SSL3_RT_CHANGE_CIPHER_SPEC | |
490 | */ | |
0f113f3e MC |
491 | /* |
492 | * make sure that we are not getting application data when we are | |
493 | * doing a handshake for the first time | |
494 | */ | |
495 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
38b051a1 TM |
496 | (sc->enc_read_ctx == NULL)) { |
497 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, | |
c2853382 MC |
498 | SSL_R_APP_DATA_IN_HANDSHAKE); |
499 | return -1; | |
0f113f3e | 500 | } |
7e159e01 | 501 | |
c69f2adf MC |
502 | if (recvd_type != NULL) |
503 | *recvd_type = SSL3_RECORD_get_type(rr); | |
504 | ||
66fab923 MC |
505 | if (len == 0) { |
506 | /* | |
507 | * Mark a zero length record as read. This ensures multiple calls to | |
508 | * SSL_read() with a zero length buffer will eventually cause | |
509 | * SSL_pending() to report data as being available. | |
510 | */ | |
511 | if (SSL3_RECORD_get_length(rr) == 0) | |
512 | SSL3_RECORD_set_read(rr); | |
eda75751 | 513 | return 0; |
66fab923 | 514 | } |
0f113f3e | 515 | |
eda75751 | 516 | if (len > SSL3_RECORD_get_length(rr)) |
747e1639 | 517 | n = SSL3_RECORD_get_length(rr); |
0f113f3e | 518 | else |
eda75751 | 519 | n = len; |
0f113f3e | 520 | |
747e1639 | 521 | memcpy(buf, &(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n); |
66fab923 MC |
522 | if (peek) { |
523 | if (SSL3_RECORD_get_length(rr) == 0) | |
524 | SSL3_RECORD_set_read(rr); | |
525 | } else { | |
38b051a1 | 526 | if (sc->options & SSL_OP_CLEANSE_PLAINTEXT) |
163b8016 | 527 | OPENSSL_cleanse(&(SSL3_RECORD_get_data(rr)[SSL3_RECORD_get_off(rr)]), n); |
753be41d | 528 | SSL3_RECORD_sub_length(rr, n); |
747e1639 MC |
529 | SSL3_RECORD_add_off(rr, n); |
530 | if (SSL3_RECORD_get_length(rr) == 0) { | |
38b051a1 | 531 | sc->rlayer.rstate = SSL_ST_READ_HEADER; |
747e1639 | 532 | SSL3_RECORD_set_off(rr, 0); |
66fab923 | 533 | SSL3_RECORD_set_read(rr); |
0f113f3e MC |
534 | } |
535 | } | |
7e159e01 | 536 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
537 | /* |
538 | * We might had to delay a close_notify alert because of reordered | |
539 | * app data. If there was an alert and there is no message to read | |
540 | * anymore, finally set shutdown. | |
541 | */ | |
542 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
38b051a1 | 543 | sc->d1->shutdown_received |
639e5760 | 544 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)) <= 0) { |
38b051a1 | 545 | sc->shutdown |= SSL_RECEIVED_SHUTDOWN; |
eda75751 | 546 | return 0; |
0f113f3e MC |
547 | } |
548 | #endif | |
02ba18a6 | 549 | *readbytes = n; |
eda75751 | 550 | return 1; |
0f113f3e MC |
551 | } |
552 | ||
553 | /* | |
554 | * If we get here, then type != rr->type; if we have a handshake message, | |
555 | * then it was unexpected (Hello Request or Client Hello). | |
556 | */ | |
557 | ||
bd990e25 MC |
558 | if (SSL3_RECORD_get_type(rr) == SSL3_RT_ALERT) { |
559 | unsigned int alert_level, alert_descr; | |
560 | unsigned char *alert_bytes = SSL3_RECORD_get_data(rr) | |
561 | + SSL3_RECORD_get_off(rr); | |
562 | PACKET alert; | |
0f113f3e | 563 | |
bd990e25 MC |
564 | if (!PACKET_buf_init(&alert, alert_bytes, SSL3_RECORD_get_length(rr)) |
565 | || !PACKET_get_1(&alert, &alert_level) | |
566 | || !PACKET_get_1(&alert, &alert_descr) | |
567 | || PACKET_remaining(&alert) != 0) { | |
38b051a1 | 568 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_INVALID_ALERT); |
c2853382 | 569 | return -1; |
0f113f3e MC |
570 | } |
571 | ||
38b051a1 TM |
572 | if (sc->msg_callback) |
573 | sc->msg_callback(0, sc->version, SSL3_RT_ALERT, alert_bytes, 2, s, | |
574 | sc->msg_callback_arg); | |
0f113f3e | 575 | |
38b051a1 TM |
576 | if (sc->info_callback != NULL) |
577 | cb = sc->info_callback; | |
0f113f3e MC |
578 | else if (s->ctx->info_callback != NULL) |
579 | cb = s->ctx->info_callback; | |
580 | ||
581 | if (cb != NULL) { | |
582 | j = (alert_level << 8) | alert_descr; | |
583 | cb(s, SSL_CB_READ_ALERT, j); | |
584 | } | |
585 | ||
fd865cad | 586 | if (alert_level == SSL3_AL_WARNING) { |
38b051a1 | 587 | sc->s3.warn_alert = alert_descr; |
66fab923 | 588 | SSL3_RECORD_set_read(rr); |
af58be76 | 589 | |
38b051a1 TM |
590 | sc->rlayer.alert_count++; |
591 | if (sc->rlayer.alert_count == MAX_WARN_ALERT_COUNT) { | |
592 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, | |
c2853382 MC |
593 | SSL_R_TOO_MANY_WARN_ALERTS); |
594 | return -1; | |
af58be76 MC |
595 | } |
596 | ||
0f113f3e | 597 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) { |
7e159e01 | 598 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
599 | /* |
600 | * With SCTP and streams the socket may deliver app data | |
601 | * after a close_notify alert. We have to check this first so | |
602 | * that nothing gets discarded. | |
603 | */ | |
604 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
639e5760 | 605 | BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)) > 0) { |
38b051a1 TM |
606 | sc->d1->shutdown_received = 1; |
607 | sc->rwstate = SSL_READING; | |
0f113f3e MC |
608 | BIO_clear_retry_flags(SSL_get_rbio(s)); |
609 | BIO_set_retry_read(SSL_get_rbio(s)); | |
610 | return -1; | |
611 | } | |
7e159e01 | 612 | #endif |
38b051a1 | 613 | sc->shutdown |= SSL_RECEIVED_SHUTDOWN; |
eda75751 | 614 | return 0; |
0f113f3e | 615 | } |
fd865cad | 616 | } else if (alert_level == SSL3_AL_FATAL) { |
38b051a1 TM |
617 | sc->rwstate = SSL_NOTHING; |
618 | sc->s3.fatal_alert = alert_descr; | |
619 | SSLfatal_data(sc, SSL_AD_NO_ALERT, | |
c48ffbcc RL |
620 | SSL_AD_REASON_OFFSET + alert_descr, |
621 | "SSL alert number %d", alert_descr); | |
38b051a1 | 622 | sc->shutdown |= SSL_RECEIVED_SHUTDOWN; |
66fab923 | 623 | SSL3_RECORD_set_read(rr); |
38b051a1 | 624 | SSL_CTX_remove_session(sc->session_ctx, sc->session); |
eda75751 | 625 | return 0; |
0f113f3e | 626 | } else { |
38b051a1 | 627 | SSLfatal(sc, SSL_AD_ILLEGAL_PARAMETER, SSL_R_UNKNOWN_ALERT_TYPE); |
c2853382 | 628 | return -1; |
0f113f3e MC |
629 | } |
630 | ||
631 | goto start; | |
632 | } | |
633 | ||
38b051a1 | 634 | if (sc->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a |
0f113f3e | 635 | * shutdown */ |
38b051a1 | 636 | sc->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 | 655 | if ((SSL3_RECORD_get_type(rr) == SSL3_RT_HANDSHAKE) && |
38b051a1 | 656 | !ossl_statem_get_in_handshake(sc)) { |
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 | */ | |
38b051a1 | 663 | if (SSL3_RECORD_get_epoch(rr) != sc->rlayer.d->r_epoch |
bd990e25 | 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) { | |
38b051a1 | 677 | if (dtls1_check_timeout_num(sc) < 0) { |
c2853382 | 678 | /* SSLfatal) already called */ |
0f113f3e | 679 | return -1; |
c2853382 | 680 | } |
0f113f3e | 681 | |
38b051a1 | 682 | if (dtls1_retransmit_buffered_messages(sc) <= 0) { |
d273b60b | 683 | /* Fail if we encountered a fatal error */ |
38b051a1 | 684 | if (ossl_statem_in_error(sc)) |
d273b60b | 685 | return -1; |
d273b60b | 686 | } |
747e1639 | 687 | SSL3_RECORD_set_length(rr, 0); |
66fab923 | 688 | SSL3_RECORD_set_read(rr); |
38b051a1 | 689 | if (!(sc->mode & SSL_MODE_AUTO_RETRY)) { |
e2d5742b | 690 | if (SSL3_BUFFER_get_left(sc->rrlmethod->get0_rbuf(sc->rrl)) == 0) { |
ad962252 MC |
691 | /* no read-ahead left? */ |
692 | BIO *bio; | |
693 | ||
38b051a1 | 694 | sc->rwstate = SSL_READING; |
ad962252 MC |
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))) { |
38b051a1 | 711 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c2853382 | 712 | return -1; |
0f113f3e | 713 | } |
c7f47786 MC |
714 | |
715 | /* We found handshake data, so we're going back into init */ | |
38b051a1 | 716 | ossl_statem_set_in_init(sc, 1); |
c7f47786 | 717 | |
38b051a1 | 718 | i = sc->handshake_func(s); |
c2853382 | 719 | /* SSLfatal() called if appropriate */ |
0f113f3e | 720 | if (i < 0) |
eda75751 | 721 | return i; |
c2853382 | 722 | if (i == 0) |
eda75751 | 723 | return -1; |
0f113f3e | 724 | |
38b051a1 | 725 | if (!(sc->mode & SSL_MODE_AUTO_RETRY)) { |
e2d5742b | 726 | if (SSL3_BUFFER_get_left(sc->rrlmethod->get0_rbuf(sc->rrl)) == 0) { |
28d59af8 | 727 | /* no read-ahead left? */ |
0f113f3e MC |
728 | BIO *bio; |
729 | /* | |
730 | * In the case where we try to read application data, but we | |
731 | * trigger an SSL handshake, we return -1 with the retry | |
732 | * option set. Otherwise renegotiation may cause nasty | |
733 | * problems in the blocking world | |
734 | */ | |
38b051a1 | 735 | sc->rwstate = SSL_READING; |
0f113f3e MC |
736 | bio = SSL_get_rbio(s); |
737 | BIO_clear_retry_flags(bio); | |
738 | BIO_set_retry_read(bio); | |
eda75751 | 739 | return -1; |
0f113f3e MC |
740 | } |
741 | } | |
742 | goto start; | |
743 | } | |
744 | ||
747e1639 | 745 | switch (SSL3_RECORD_get_type(rr)) { |
0f113f3e | 746 | default: |
38b051a1 | 747 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_UNEXPECTED_RECORD); |
c2853382 | 748 | return -1; |
0f113f3e MC |
749 | case SSL3_RT_CHANGE_CIPHER_SPEC: |
750 | case SSL3_RT_ALERT: | |
751 | case SSL3_RT_HANDSHAKE: | |
752 | /* | |
753 | * we already handled all of these, with the possible exception of | |
024f543c MC |
754 | * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but |
755 | * that should not happen when type != rr->type | |
0f113f3e | 756 | */ |
38b051a1 | 757 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, ERR_R_INTERNAL_ERROR); |
c2853382 | 758 | return -1; |
0f113f3e MC |
759 | case SSL3_RT_APPLICATION_DATA: |
760 | /* | |
761 | * At this point, we were expecting handshake data, but have | |
762 | * application data. If the library was running inside ssl3_read() | |
763 | * (i.e. in_read_app_data is set) and it makes sense to read | |
764 | * application data at this point (session renegotiation not yet | |
765 | * started), we will indulge it. | |
766 | */ | |
38b051a1 TM |
767 | if (sc->s3.in_read_app_data && |
768 | (sc->s3.total_renegotiations != 0) && | |
769 | ossl_statem_app_data_allowed(sc)) { | |
770 | sc->s3.in_read_app_data = 2; | |
eda75751 | 771 | return -1; |
0f113f3e | 772 | } else { |
38b051a1 | 773 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_UNEXPECTED_RECORD); |
c2853382 | 774 | return -1; |
0f113f3e MC |
775 | } |
776 | } | |
777 | /* not reached */ | |
0f113f3e MC |
778 | } |
779 | ||
0f113f3e MC |
780 | /* |
781 | * Call this to write data in records of type 'type' It will return <= 0 if | |
782 | * not all data has been sent or non-blocking IO. | |
36d16f8e | 783 | */ |
38b051a1 TM |
784 | int dtls1_write_bytes(SSL_CONNECTION *s, int type, const void *buf, |
785 | size_t len, size_t *written) | |
0f113f3e MC |
786 | { |
787 | int i; | |
788 | ||
42bd7a16 | 789 | if (!ossl_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH)) { |
c48ffbcc | 790 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
380a522f | 791 | return -1; |
42bd7a16 | 792 | } |
0f113f3e | 793 | s->rwstate = SSL_NOTHING; |
7ee8627f | 794 | i = do_dtls1_write(s, type, buf, len, 0, written); |
0f113f3e MC |
795 | return i; |
796 | } | |
797 | ||
38b051a1 | 798 | int do_dtls1_write(SSL_CONNECTION *sc, int type, const unsigned char *buf, |
7ee8627f | 799 | size_t len, int create_empty_fragment, size_t *written) |
0f113f3e MC |
800 | { |
801 | unsigned char *p, *pseq; | |
802 | int i, mac_size, clear = 0; | |
7ee8627f | 803 | size_t prefix_len = 0; |
0f113f3e | 804 | int eivlen; |
f482740f | 805 | SSL3_RECORD wr; |
0f113f3e MC |
806 | SSL3_BUFFER *wb; |
807 | SSL_SESSION *sess; | |
38b051a1 | 808 | SSL *s = SSL_CONNECTION_GET_SSL(sc); |
0f113f3e | 809 | |
38b051a1 | 810 | wb = &sc->rlayer.wbuf[0]; |
db9a32e7 | 811 | |
0f113f3e | 812 | /* |
70cae332 BK |
813 | * DTLS writes whole datagrams, so there can't be anything left in |
814 | * the buffer. | |
0f113f3e | 815 | */ |
380a522f | 816 | if (!ossl_assert(SSL3_BUFFER_get_left(wb) == 0)) { |
38b051a1 | 817 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
380a522f | 818 | return 0; |
0f113f3e MC |
819 | } |
820 | ||
821 | /* If we have an alert to send, lets send it */ | |
38b051a1 | 822 | if (sc->s3.alert_dispatch) { |
0f113f3e MC |
823 | i = s->method->ssl_dispatch_alert(s); |
824 | if (i <= 0) | |
7ee8627f | 825 | return i; |
0f113f3e MC |
826 | /* if it went, fall through and send more stuff */ |
827 | } | |
828 | ||
829 | if (len == 0 && !create_empty_fragment) | |
830 | return 0; | |
831 | ||
38b051a1 TM |
832 | if (len > ssl_get_max_send_fragment(sc)) { |
833 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, SSL_R_EXCEEDS_MAX_FRAGMENT_SIZE); | |
aefb9256 MC |
834 | return 0; |
835 | } | |
836 | ||
38b051a1 | 837 | sess = sc->session; |
0f113f3e | 838 | |
f6c95e46 | 839 | if ((sess == NULL) |
38b051a1 TM |
840 | || (sc->enc_write_ctx == NULL) |
841 | || (EVP_MD_CTX_get0_md(sc->write_hash) == NULL)) | |
0f113f3e MC |
842 | clear = 1; |
843 | ||
844 | if (clear) | |
845 | mac_size = 0; | |
846 | else { | |
38b051a1 | 847 | mac_size = EVP_MD_CTX_get_size(sc->write_hash); |
5591a613 | 848 | if (mac_size < 0) { |
38b051a1 | 849 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, |
5591a613 MC |
850 | SSL_R_EXCEEDS_MAX_FRAGMENT_SIZE); |
851 | return -1; | |
852 | } | |
0f113f3e MC |
853 | } |
854 | ||
747e1639 | 855 | p = SSL3_BUFFER_get_buf(wb) + prefix_len; |
0f113f3e MC |
856 | |
857 | /* write the header */ | |
858 | ||
859 | *(p++) = type & 0xff; | |
f482740f | 860 | SSL3_RECORD_set_type(&wr, type); |
0f113f3e MC |
861 | /* |
862 | * Special case: for hello verify request, client version 1.0 and we | |
863 | * haven't decided which version to use yet send back using version 1.0 | |
864 | * header: otherwise some clients will ignore it. | |
865 | */ | |
032924c4 | 866 | if (s->method->version == DTLS_ANY_VERSION && |
38b051a1 | 867 | sc->max_proto_version != DTLS1_BAD_VER) { |
0f113f3e MC |
868 | *(p++) = DTLS1_VERSION >> 8; |
869 | *(p++) = DTLS1_VERSION & 0xff; | |
870 | } else { | |
38b051a1 TM |
871 | *(p++) = sc->version >> 8; |
872 | *(p++) = sc->version & 0xff; | |
0f113f3e MC |
873 | } |
874 | ||
875 | /* field where we are to write out packet epoch, seq num and len */ | |
876 | pseq = p; | |
877 | p += 10; | |
878 | ||
879 | /* Explicit IV length, block ciphers appropriate version flag */ | |
38b051a1 TM |
880 | if (sc->enc_write_ctx) { |
881 | int mode = EVP_CIPHER_CTX_get_mode(sc->enc_write_ctx); | |
0f113f3e | 882 | if (mode == EVP_CIPH_CBC_MODE) { |
38b051a1 | 883 | eivlen = EVP_CIPHER_CTX_get_iv_length(sc->enc_write_ctx); |
83ab43da DB |
884 | if (eivlen < 0) { |
885 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, SSL_R_LIBRARY_BUG); | |
886 | return -1; | |
887 | } | |
0f113f3e MC |
888 | if (eivlen <= 1) |
889 | eivlen = 0; | |
890 | } | |
891 | /* Need explicit part of IV for GCM mode */ | |
892 | else if (mode == EVP_CIPH_GCM_MODE) | |
893 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
e75c5a79 DSH |
894 | else if (mode == EVP_CIPH_CCM_MODE) |
895 | eivlen = EVP_CCM_TLS_EXPLICIT_IV_LEN; | |
0f113f3e MC |
896 | else |
897 | eivlen = 0; | |
898 | } else | |
899 | eivlen = 0; | |
900 | ||
901 | /* lets setup the record stuff. */ | |
f482740f | 902 | SSL3_RECORD_set_data(&wr, p + eivlen); /* make room for IV in case of CBC */ |
7ee8627f | 903 | SSL3_RECORD_set_length(&wr, len); |
f482740f | 904 | SSL3_RECORD_set_input(&wr, (unsigned char *)buf); |
0f113f3e MC |
905 | |
906 | /* | |
f482740f | 907 | * we now 'read' from wr.input, wr.length bytes into wr.data |
0f113f3e MC |
908 | */ |
909 | ||
910 | /* first we compress */ | |
38b051a1 TM |
911 | if (sc->compress != NULL) { |
912 | if (!ssl3_do_compress(sc, &wr)) { | |
913 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, SSL_R_COMPRESSION_FAILURE); | |
5591a613 | 914 | return -1; |
0f113f3e MC |
915 | } |
916 | } else { | |
f482740f MC |
917 | memcpy(SSL3_RECORD_get_data(&wr), SSL3_RECORD_get_input(&wr), |
918 | SSL3_RECORD_get_length(&wr)); | |
919 | SSL3_RECORD_reset_input(&wr); | |
0f113f3e | 920 | } |
36d16f8e | 921 | |
0f113f3e | 922 | /* |
f482740f MC |
923 | * we should still have the output to wr.data and the input from |
924 | * wr.input. Length should be wr.length. wr.data still points in the | |
0f113f3e MC |
925 | * wb->buf |
926 | */ | |
36d16f8e | 927 | |
38b051a1 TM |
928 | if (!SSL_WRITE_ETM(sc) && mac_size != 0) { |
929 | if (!s->method->ssl3_enc->mac(sc, &wr, | |
a14aa99b | 930 | &(p[SSL3_RECORD_get_length(&wr) + eivlen]), |
5591a613 | 931 | 1)) { |
38b051a1 | 932 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
5591a613 MC |
933 | return -1; |
934 | } | |
f482740f | 935 | SSL3_RECORD_add_length(&wr, mac_size); |
0f113f3e | 936 | } |
36d16f8e | 937 | |
0f113f3e | 938 | /* this is true regardless of mac size */ |
f482740f MC |
939 | SSL3_RECORD_set_data(&wr, p); |
940 | SSL3_RECORD_reset_input(&wr); | |
36d16f8e | 941 | |
0f113f3e | 942 | if (eivlen) |
f482740f | 943 | SSL3_RECORD_add_length(&wr, eivlen); |
36d16f8e | 944 | |
38b051a1 TM |
945 | if (s->method->ssl3_enc->enc(sc, &wr, 1, 1, NULL, mac_size) < 1) { |
946 | if (!ossl_statem_in_error(sc)) { | |
947 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); | |
921d84a0 | 948 | } |
5591a613 MC |
949 | return -1; |
950 | } | |
36d16f8e | 951 | |
38b051a1 TM |
952 | if (SSL_WRITE_ETM(sc) && mac_size != 0) { |
953 | if (!s->method->ssl3_enc->mac(sc, &wr, | |
5591a613 | 954 | &(p[SSL3_RECORD_get_length(&wr)]), 1)) { |
38b051a1 | 955 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
5591a613 MC |
956 | return -1; |
957 | } | |
e23d5071 DW |
958 | SSL3_RECORD_add_length(&wr, mac_size); |
959 | } | |
960 | ||
0f113f3e | 961 | /* record length after mac and block padding */ |
36d16f8e | 962 | |
0f113f3e | 963 | /* there's only one epoch between handshake and app data */ |
36d16f8e | 964 | |
38b051a1 | 965 | s2n(sc->rlayer.d->w_epoch, pseq); |
36d16f8e | 966 | |
38b051a1 | 967 | memcpy(pseq, &(sc->rlayer.write_sequence[2]), 6); |
0f113f3e | 968 | pseq += 6; |
f482740f | 969 | s2n(SSL3_RECORD_get_length(&wr), pseq); |
36d16f8e | 970 | |
38b051a1 TM |
971 | if (sc->msg_callback) |
972 | sc->msg_callback(1, 0, SSL3_RT_HEADER, pseq - DTLS1_RT_HEADER_LENGTH, | |
973 | DTLS1_RT_HEADER_LENGTH, s, sc->msg_callback_arg); | |
36d16f8e | 974 | |
0f113f3e | 975 | /* |
f482740f | 976 | * we should now have wr.data pointing to the encrypted data, which is |
0f113f3e MC |
977 | * wr->length long |
978 | */ | |
f482740f MC |
979 | SSL3_RECORD_set_type(&wr, type); /* not needed but helps for debugging */ |
980 | SSL3_RECORD_add_length(&wr, DTLS1_RT_HEADER_LENGTH); | |
36d16f8e | 981 | |
38b051a1 | 982 | ssl3_record_sequence_update(&(sc->rlayer.write_sequence[0])); |
36d16f8e | 983 | |
0f113f3e MC |
984 | if (create_empty_fragment) { |
985 | /* | |
986 | * we are in a recursive call; just return the length, don't write | |
987 | * out anything here | |
988 | */ | |
7ee8627f MC |
989 | *written = wr.length; |
990 | return 1; | |
0f113f3e | 991 | } |
36d16f8e | 992 | |
0f113f3e | 993 | /* now let's set up wb */ |
f482740f | 994 | SSL3_BUFFER_set_left(wb, prefix_len + SSL3_RECORD_get_length(&wr)); |
747e1639 | 995 | SSL3_BUFFER_set_offset(wb, 0); |
0f113f3e MC |
996 | |
997 | /* | |
998 | * memorize arguments so that ssl3_write_pending can detect bad write | |
999 | * retries later | |
1000 | */ | |
38b051a1 TM |
1001 | sc->rlayer.wpend_tot = len; |
1002 | sc->rlayer.wpend_buf = buf; | |
1003 | sc->rlayer.wpend_type = type; | |
1004 | sc->rlayer.wpend_ret = len; | |
0f113f3e | 1005 | |
c2853382 | 1006 | /* we now just need to write the buffer. Calls SSLfatal() as required. */ |
38b051a1 | 1007 | return ssl3_write_pending(sc, type, buf, len, written); |
0f113f3e | 1008 | } |
36d16f8e | 1009 | |
38b051a1 | 1010 | DTLS1_BITMAP *dtls1_get_bitmap(SSL_CONNECTION *s, SSL3_RECORD *rr, |
a230b26e | 1011 | unsigned int *is_next_epoch) |
0f113f3e MC |
1012 | { |
1013 | ||
36d16f8e BL |
1014 | *is_next_epoch = 0; |
1015 | ||
1016 | /* In current epoch, accept HM, CCS, DATA, & ALERT */ | |
78a39fe7 | 1017 | if (rr->epoch == s->rlayer.d->r_epoch) |
91f93f69 | 1018 | return &s->rlayer.d->bitmap; |
36d16f8e | 1019 | |
738ad946 MC |
1020 | /* |
1021 | * Only HM and ALERT messages can be from the next epoch and only if we | |
1022 | * have already processed all of the unprocessed records from the last | |
1023 | * epoch | |
1024 | */ | |
78a39fe7 | 1025 | else if (rr->epoch == (unsigned long)(s->rlayer.d->r_epoch + 1) && |
738ad946 | 1026 | s->rlayer.d->unprocessed_rcds.epoch != s->rlayer.d->r_epoch && |
a230b26e | 1027 | (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) { |
36d16f8e | 1028 | *is_next_epoch = 1; |
91f93f69 | 1029 | return &s->rlayer.d->next_bitmap; |
0f113f3e | 1030 | } |
36d16f8e BL |
1031 | |
1032 | return NULL; | |
0f113f3e | 1033 | } |
36d16f8e | 1034 | |
38b051a1 | 1035 | void dtls1_reset_seq_numbers(SSL_CONNECTION *s, int rw) |
0f113f3e MC |
1036 | { |
1037 | unsigned char *seq; | |
de07f311 | 1038 | unsigned int seq_bytes = sizeof(s->rlayer.read_sequence); |
0f113f3e MC |
1039 | |
1040 | if (rw & SSL3_CC_READ) { | |
de07f311 | 1041 | seq = s->rlayer.read_sequence; |
78a39fe7 | 1042 | s->rlayer.d->r_epoch++; |
16f8d4eb RS |
1043 | memcpy(&s->rlayer.d->bitmap, &s->rlayer.d->next_bitmap, |
1044 | sizeof(s->rlayer.d->bitmap)); | |
a230b26e | 1045 | memset(&s->rlayer.d->next_bitmap, 0, sizeof(s->rlayer.d->next_bitmap)); |
5cb4d646 MC |
1046 | |
1047 | /* | |
1048 | * We must not use any buffered messages received from the previous | |
1049 | * epoch | |
1050 | */ | |
1051 | dtls1_clear_received_buffer(s); | |
0f113f3e | 1052 | } else { |
de07f311 | 1053 | seq = s->rlayer.write_sequence; |
3bb8f87d | 1054 | memcpy(s->rlayer.d->last_write_sequence, seq, |
de07f311 | 1055 | sizeof(s->rlayer.write_sequence)); |
78a39fe7 | 1056 | s->rlayer.d->w_epoch++; |
0f113f3e MC |
1057 | } |
1058 | ||
16f8d4eb | 1059 | memset(seq, 0, seq_bytes); |
0f113f3e | 1060 | } |