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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 | |
e077455e | 23 | if ((d = OPENSSL_malloc(sizeof(*d))) == NULL) |
26a7d938 | 24 | return 0; |
40f37188 MC |
25 | |
26 | rl->d = d; | |
5fb6f80c | 27 | |
24a1e2f2 | 28 | d->buffered_app_data.q = pqueue_new(); |
cb2ce7ab | 29 | |
eddb067e | 30 | if (d->buffered_app_data.q == NULL) { |
cb2ce7ab MC |
31 | OPENSSL_free(d); |
32 | rl->d = NULL; | |
26a7d938 | 33 | return 0; |
cb2ce7ab | 34 | } |
40f37188 MC |
35 | |
36 | return 1; | |
37 | } | |
38 | ||
39 | void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl) | |
40 | { | |
d0afb30e MC |
41 | if (rl->d == NULL) |
42 | return; | |
43 | ||
cb2ce7ab | 44 | DTLS_RECORD_LAYER_clear(rl); |
24a1e2f2 | 45 | pqueue_free(rl->d->buffered_app_data.q); |
40f37188 MC |
46 | OPENSSL_free(rl->d); |
47 | rl->d = NULL; | |
48 | } | |
49 | ||
50 | void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl) | |
51 | { | |
52 | DTLS_RECORD_LAYER *d; | |
cb2ce7ab | 53 | pitem *item = NULL; |
eddb067e | 54 | TLS_RECORD *rec; |
cf2cede4 | 55 | pqueue *buffered_app_data; |
cb2ce7ab | 56 | |
40f37188 | 57 | d = rl->d; |
0485d540 | 58 | |
24a1e2f2 | 59 | while ((item = pqueue_pop(d->buffered_app_data.q)) != NULL) { |
eddb067e | 60 | rec = (TLS_RECORD *)item->data; |
163b8016 | 61 | if (rl->s->options & SSL_OP_CLEANSE_PLAINTEXT) |
eddb067e MC |
62 | OPENSSL_cleanse(rec->data, rec->length); |
63 | OPENSSL_free(rec->data); | |
24a1e2f2 MC |
64 | OPENSSL_free(item->data); |
65 | pitem_free(item); | |
66 | } | |
67 | ||
24a1e2f2 | 68 | buffered_app_data = d->buffered_app_data.q; |
b4faea50 | 69 | memset(d, 0, sizeof(*d)); |
24a1e2f2 | 70 | d->buffered_app_data.q = buffered_app_data; |
40f37188 MC |
71 | } |
72 | ||
eddb067e | 73 | int dtls_buffer_record(SSL_CONNECTION *s, TLS_RECORD *rec) |
0f113f3e | 74 | { |
eddb067e | 75 | TLS_RECORD *rdata; |
0f113f3e | 76 | pitem *item; |
eddb067e | 77 | record_pqueue *queue = &(s->rlayer.d->buffered_app_data); |
0f113f3e MC |
78 | |
79 | /* Limit the size of the queue to prevent DOS attacks */ | |
80 | if (pqueue_size(queue->q) >= 100) | |
81 | return 0; | |
82 | ||
eddb067e MC |
83 | /* We don't buffer partially read records */ |
84 | if (!ossl_assert(rec->off == 0)) | |
85 | return -1; | |
86 | ||
b4faea50 | 87 | rdata = OPENSSL_malloc(sizeof(*rdata)); |
eddb067e | 88 | item = pitem_new(rec->seq_num, rdata); |
0f113f3e | 89 | if (rdata == NULL || item == NULL) { |
b548a1f1 | 90 | OPENSSL_free(rdata); |
25aaa98a | 91 | pitem_free(item); |
c48ffbcc | 92 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
06c6a2b4 | 93 | return -1; |
0f113f3e MC |
94 | } |
95 | ||
eddb067e MC |
96 | *rdata = *rec; |
97 | /* | |
98 | * We will release the record from the record layer soon, so we take a copy | |
99 | * now. Copying data isn't good - but this should be infrequent so we | |
100 | * accept it here. | |
101 | */ | |
102 | rdata->data = OPENSSL_memdup(rec->data, rec->length); | |
103 | if (rdata->data == NULL) { | |
104 | OPENSSL_free(rdata); | |
105 | pitem_free(item); | |
e077455e | 106 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_CRYPTO_LIB); |
eddb067e MC |
107 | return -1; |
108 | } | |
109 | /* | |
110 | * We use a NULL rechandle to indicate that the data field has been | |
111 | * allocated by us. | |
112 | */ | |
113 | rdata->rechandle = NULL; | |
0f113f3e MC |
114 | |
115 | item->data = rdata; | |
36d16f8e | 116 | |
7e159e01 | 117 | #ifndef OPENSSL_NO_SCTP |
0f113f3e | 118 | /* Store bio_dgram_sctp_rcvinfo struct */ |
846975f3 | 119 | if (BIO_dgram_is_sctp(s->rbio) && |
120 | (ossl_statem_get_state(s) == TLS_ST_SR_FINISHED | |
121 | || ossl_statem_get_state(s) == TLS_ST_CR_FINISHED)) { | |
122 | BIO_ctrl(s->rbio, BIO_CTRL_DGRAM_SCTP_GET_RCVINFO, | |
0f113f3e MC |
123 | sizeof(rdata->recordinfo), &rdata->recordinfo); |
124 | } | |
7e159e01 DSH |
125 | #endif |
126 | ||
0f113f3e | 127 | if (pqueue_insert(queue->q, item) == NULL) { |
840facc3 | 128 | /* Must be a duplicate so ignore it */ |
eddb067e | 129 | OPENSSL_free(rdata->data); |
0f113f3e MC |
130 | OPENSSL_free(rdata); |
131 | pitem_free(item); | |
0f113f3e | 132 | } |
36d16f8e | 133 | |
208fb891 | 134 | return 1; |
0f113f3e MC |
135 | } |
136 | ||
eddb067e MC |
137 | /* Unbuffer a previously buffered TLS_RECORD structure if any */ |
138 | static void dtls_unbuffer_record(SSL_CONNECTION *s) | |
0f113f3e | 139 | { |
eddb067e | 140 | TLS_RECORD *rdata; |
36d16f8e BL |
141 | pitem *item; |
142 | ||
eddb067e MC |
143 | /* If we already have records to handle then do nothing */ |
144 | if (s->rlayer.curr_rec < s->rlayer.num_recs) | |
145 | return; | |
1fb9fdc3 | 146 | |
eddb067e MC |
147 | item = pqueue_pop(s->rlayer.d->buffered_app_data.q); |
148 | if (item != NULL) { | |
149 | rdata = (TLS_RECORD *)item->data; | |
0f113f3e | 150 | |
eddb067e MC |
151 | s->rlayer.tlsrecs[0] = *rdata; |
152 | s->rlayer.num_recs = 1; | |
153 | s->rlayer.curr_rec = 0; | |
738ad946 | 154 | |
1fb9fdc3 | 155 | #ifndef OPENSSL_NO_SCTP |
eddb067e | 156 | /* Restore bio_dgram_sctp_rcvinfo struct */ |
846975f3 | 157 | if (BIO_dgram_is_sctp(s->rbio)) { |
158 | BIO_ctrl(s->rbio, BIO_CTRL_DGRAM_SCTP_SET_RCVINFO, | |
159 | sizeof(rdata->recordinfo), &rdata->recordinfo); | |
eddb067e | 160 | } |
1fb9fdc3 | 161 | #endif |
1fb9fdc3 | 162 | |
eddb067e MC |
163 | OPENSSL_free(item->data); |
164 | pitem_free(item); | |
0f113f3e | 165 | } |
0f113f3e | 166 | } |
36d16f8e | 167 | |
1d97c843 TH |
168 | /*- |
169 | * Return up to 'len' payload bytes received in 'type' records. | |
36d16f8e BL |
170 | * 'type' is one of the following: |
171 | * | |
172 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
173 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
174 | * - 0 (during a shutdown, no data has to be returned) | |
175 | * | |
176 | * If we don't have stored data to work from, read a SSL/TLS record first | |
177 | * (possibly multiple records if we still don't have anything to return). | |
178 | * | |
179 | * This function must handle any surprises the peer may have for us, such as | |
c69f2adf MC |
180 | * Alert records (e.g. close_notify) or renegotiation requests. ChangeCipherSpec |
181 | * messages are treated as if they were handshake messages *if* the |recd_type| | |
182 | * argument is non NULL. | |
36d16f8e BL |
183 | * Also if record payloads contain fragments too small to process, we store |
184 | * them until there is enough for the respective protocol (the record protocol | |
185 | * may use arbitrary fragmentation and even interleaving): | |
186 | * Change cipher spec protocol | |
187 | * just 1 byte needed, no need for keeping anything stored | |
188 | * Alert protocol | |
189 | * 2 bytes needed (AlertLevel, AlertDescription) | |
190 | * Handshake protocol | |
191 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
192 | * to detect unexpected Client Hello and Hello Request messages | |
193 | * here, anything else is handled by higher layers | |
194 | * Application data protocol | |
195 | * none of our business | |
196 | */ | |
657da85e | 197 | int dtls1_read_bytes(SSL *s, int type, int *recvd_type, unsigned char *buf, |
02ba18a6 | 198 | size_t len, int peek, size_t *readbytes) |
0f113f3e | 199 | { |
eddb067e | 200 | int i, j, ret; |
bd990e25 | 201 | size_t n; |
eddb067e | 202 | TLS_RECORD *rr; |
0f113f3e | 203 | void (*cb) (const SSL *ssl, int type2, int val) = NULL; |
38b051a1 TM |
204 | SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s); |
205 | ||
206 | if (sc == NULL) | |
207 | return -1; | |
0f113f3e | 208 | |
0f113f3e MC |
209 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && |
210 | (type != SSL3_RT_HANDSHAKE)) || | |
211 | (peek && (type != SSL3_RT_APPLICATION_DATA))) { | |
38b051a1 | 212 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
213 | return -1; |
214 | } | |
215 | ||
38b051a1 | 216 | if (!ossl_statem_get_in_handshake(sc) && SSL_in_init(s)) { |
0f113f3e | 217 | /* type == SSL3_RT_APPLICATION_DATA */ |
38b051a1 | 218 | i = sc->handshake_func(s); |
c2853382 | 219 | /* SSLfatal() already called if appropriate */ |
0f113f3e | 220 | if (i < 0) |
eda75751 | 221 | return i; |
c2853382 | 222 | if (i == 0) |
eda75751 | 223 | return -1; |
0f113f3e MC |
224 | } |
225 | ||
226 | start: | |
38b051a1 | 227 | sc->rwstate = SSL_NOTHING; |
0f113f3e | 228 | |
0f113f3e MC |
229 | /* |
230 | * We are not handshaking and have no data yet, so process data buffered | |
231 | * during the last handshake in advance, if any. | |
232 | */ | |
eddb067e MC |
233 | if (SSL_is_init_finished(s)) |
234 | dtls_unbuffer_record(sc); | |
0f113f3e MC |
235 | |
236 | /* Check for timeout */ | |
38b051a1 | 237 | if (dtls1_handle_timeout(sc) > 0) { |
0f113f3e | 238 | goto start; |
38b051a1 | 239 | } else if (ossl_statem_in_error(sc)) { |
d273b60b MC |
240 | /* dtls1_handle_timeout() has failed with a fatal error */ |
241 | return -1; | |
242 | } | |
0f113f3e MC |
243 | |
244 | /* get new packet if necessary */ | |
eddb067e MC |
245 | if (sc->rlayer.curr_rec >= sc->rlayer.num_recs) { |
246 | sc->rlayer.curr_rec = sc->rlayer.num_recs = 0; | |
247 | do { | |
248 | rr = &sc->rlayer.tlsrecs[sc->rlayer.num_recs]; | |
249 | ||
320145d5 | 250 | ret = HANDLE_RLAYER_READ_RETURN(sc, |
cffafb5f MC |
251 | sc->rlayer.rrlmethod->read_record(sc->rlayer.rrl, |
252 | &rr->rechandle, | |
253 | &rr->version, &rr->type, | |
254 | &rr->data, &rr->length, | |
255 | &rr->epoch, rr->seq_num)); | |
eddb067e MC |
256 | if (ret <= 0) { |
257 | ret = dtls1_read_failed(sc, ret); | |
258 | /* | |
259 | * Anything other than a timeout is an error. SSLfatal() already | |
260 | * called if appropriate. | |
261 | */ | |
262 | if (ret <= 0) | |
263 | return ret; | |
264 | else | |
265 | goto start; | |
266 | } | |
267 | rr->off = 0; | |
268 | sc->rlayer.num_recs++; | |
cffafb5f | 269 | } while (sc->rlayer.rrlmethod->processed_read_pending(sc->rlayer.rrl) |
eddb067e | 270 | && sc->rlayer.num_recs < SSL_MAX_PIPELINES); |
0f113f3e | 271 | } |
eddb067e | 272 | rr = &sc->rlayer.tlsrecs[sc->rlayer.curr_rec]; |
0f113f3e | 273 | |
af58be76 MC |
274 | /* |
275 | * Reset the count of consecutive warning alerts if we've got a non-empty | |
276 | * record that isn't an alert. | |
277 | */ | |
eddb067e | 278 | if (rr->type != SSL3_RT_ALERT && rr->length != 0) |
38b051a1 | 279 | sc->rlayer.alert_count = 0; |
af58be76 | 280 | |
0f113f3e MC |
281 | /* we now have a packet which can be read and processed */ |
282 | ||
38b051a1 | 283 | if (sc->s3.change_cipher_spec /* set when we receive ChangeCipherSpec, |
555cbb32 | 284 | * reset by ssl3_get_finished */ |
eddb067e | 285 | && (rr->type != SSL3_RT_HANDSHAKE)) { |
0f113f3e MC |
286 | /* |
287 | * We now have application data between CCS and Finished. Most likely | |
288 | * the packets were reordered on their way, so buffer the application | |
289 | * data for later processing rather than dropping the connection. | |
290 | */ | |
eddb067e | 291 | if (dtls_buffer_record(sc, rr) < 0) { |
c2853382 | 292 | /* SSLfatal() already called */ |
0f113f3e MC |
293 | return -1; |
294 | } | |
eddb067e | 295 | ssl_release_record(sc, rr); |
0f113f3e MC |
296 | goto start; |
297 | } | |
298 | ||
299 | /* | |
300 | * If the other end has shut down, throw anything we read away (even in | |
301 | * 'peek' mode) | |
302 | */ | |
38b051a1 | 303 | if (sc->shutdown & SSL_RECEIVED_SHUTDOWN) { |
eddb067e | 304 | ssl_release_record(sc, rr); |
38b051a1 | 305 | sc->rwstate = SSL_NOTHING; |
eda75751 | 306 | return 0; |
0f113f3e MC |
307 | } |
308 | ||
eddb067e MC |
309 | if (type == rr->type |
310 | || (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC | |
a230b26e | 311 | && type == SSL3_RT_HANDSHAKE && recvd_type != NULL)) { |
c69f2adf MC |
312 | /* |
313 | * SSL3_RT_APPLICATION_DATA or | |
314 | * SSL3_RT_HANDSHAKE or | |
315 | * SSL3_RT_CHANGE_CIPHER_SPEC | |
316 | */ | |
0f113f3e MC |
317 | /* |
318 | * make sure that we are not getting application data when we are | |
319 | * doing a handshake for the first time | |
320 | */ | |
321 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
38b051a1 TM |
322 | (sc->enc_read_ctx == NULL)) { |
323 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, | |
c2853382 MC |
324 | SSL_R_APP_DATA_IN_HANDSHAKE); |
325 | return -1; | |
0f113f3e | 326 | } |
7e159e01 | 327 | |
c69f2adf | 328 | if (recvd_type != NULL) |
eddb067e | 329 | *recvd_type = rr->type; |
c69f2adf | 330 | |
66fab923 MC |
331 | if (len == 0) { |
332 | /* | |
eddb067e | 333 | * Release a zero length record. This ensures multiple calls to |
66fab923 MC |
334 | * SSL_read() with a zero length buffer will eventually cause |
335 | * SSL_pending() to report data as being available. | |
336 | */ | |
eddb067e MC |
337 | if (rr->length == 0) |
338 | ssl_release_record(sc, rr); | |
eda75751 | 339 | return 0; |
66fab923 | 340 | } |
0f113f3e | 341 | |
eddb067e MC |
342 | if (len > rr->length) |
343 | n = rr->length; | |
0f113f3e | 344 | else |
eda75751 | 345 | n = len; |
0f113f3e | 346 | |
eddb067e | 347 | memcpy(buf, &(rr->data[rr->off]), n); |
66fab923 | 348 | if (peek) { |
eddb067e MC |
349 | if (rr->length == 0) |
350 | ssl_release_record(sc, rr); | |
66fab923 | 351 | } else { |
38b051a1 | 352 | if (sc->options & SSL_OP_CLEANSE_PLAINTEXT) |
eddb067e MC |
353 | OPENSSL_cleanse(&(rr->data[rr->off]), n); |
354 | rr->length -= n; | |
355 | rr->off += n; | |
8bbf7ef6 | 356 | if (rr->length == 0) |
eddb067e | 357 | ssl_release_record(sc, rr); |
0f113f3e | 358 | } |
7e159e01 | 359 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
360 | /* |
361 | * We might had to delay a close_notify alert because of reordered | |
362 | * app data. If there was an alert and there is no message to read | |
363 | * anymore, finally set shutdown. | |
364 | */ | |
365 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
38b051a1 | 366 | sc->d1->shutdown_received |
639e5760 | 367 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)) <= 0) { |
38b051a1 | 368 | sc->shutdown |= SSL_RECEIVED_SHUTDOWN; |
eda75751 | 369 | return 0; |
0f113f3e MC |
370 | } |
371 | #endif | |
02ba18a6 | 372 | *readbytes = n; |
eda75751 | 373 | return 1; |
0f113f3e MC |
374 | } |
375 | ||
376 | /* | |
377 | * If we get here, then type != rr->type; if we have a handshake message, | |
378 | * then it was unexpected (Hello Request or Client Hello). | |
379 | */ | |
380 | ||
eddb067e | 381 | if (rr->type == SSL3_RT_ALERT) { |
bd990e25 | 382 | unsigned int alert_level, alert_descr; |
eddb067e | 383 | unsigned char *alert_bytes = rr->data + rr->off; |
bd990e25 | 384 | PACKET alert; |
0f113f3e | 385 | |
eddb067e | 386 | if (!PACKET_buf_init(&alert, alert_bytes, rr->length) |
bd990e25 MC |
387 | || !PACKET_get_1(&alert, &alert_level) |
388 | || !PACKET_get_1(&alert, &alert_descr) | |
389 | || PACKET_remaining(&alert) != 0) { | |
38b051a1 | 390 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_INVALID_ALERT); |
c2853382 | 391 | return -1; |
0f113f3e MC |
392 | } |
393 | ||
38b051a1 TM |
394 | if (sc->msg_callback) |
395 | sc->msg_callback(0, sc->version, SSL3_RT_ALERT, alert_bytes, 2, s, | |
396 | sc->msg_callback_arg); | |
0f113f3e | 397 | |
38b051a1 TM |
398 | if (sc->info_callback != NULL) |
399 | cb = sc->info_callback; | |
0f113f3e MC |
400 | else if (s->ctx->info_callback != NULL) |
401 | cb = s->ctx->info_callback; | |
402 | ||
403 | if (cb != NULL) { | |
404 | j = (alert_level << 8) | alert_descr; | |
405 | cb(s, SSL_CB_READ_ALERT, j); | |
406 | } | |
407 | ||
fd865cad | 408 | if (alert_level == SSL3_AL_WARNING) { |
38b051a1 | 409 | sc->s3.warn_alert = alert_descr; |
eddb067e | 410 | ssl_release_record(sc, rr); |
af58be76 | 411 | |
38b051a1 TM |
412 | sc->rlayer.alert_count++; |
413 | if (sc->rlayer.alert_count == MAX_WARN_ALERT_COUNT) { | |
414 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, | |
c2853382 MC |
415 | SSL_R_TOO_MANY_WARN_ALERTS); |
416 | return -1; | |
af58be76 MC |
417 | } |
418 | ||
0f113f3e | 419 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) { |
7e159e01 | 420 | #ifndef OPENSSL_NO_SCTP |
0f113f3e MC |
421 | /* |
422 | * With SCTP and streams the socket may deliver app data | |
423 | * after a close_notify alert. We have to check this first so | |
424 | * that nothing gets discarded. | |
425 | */ | |
426 | if (BIO_dgram_is_sctp(SSL_get_rbio(s)) && | |
639e5760 | 427 | BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)) > 0) { |
38b051a1 TM |
428 | sc->d1->shutdown_received = 1; |
429 | sc->rwstate = SSL_READING; | |
0f113f3e MC |
430 | BIO_clear_retry_flags(SSL_get_rbio(s)); |
431 | BIO_set_retry_read(SSL_get_rbio(s)); | |
432 | return -1; | |
433 | } | |
7e159e01 | 434 | #endif |
38b051a1 | 435 | sc->shutdown |= SSL_RECEIVED_SHUTDOWN; |
eda75751 | 436 | return 0; |
0f113f3e | 437 | } |
fd865cad | 438 | } else if (alert_level == SSL3_AL_FATAL) { |
38b051a1 TM |
439 | sc->rwstate = SSL_NOTHING; |
440 | sc->s3.fatal_alert = alert_descr; | |
441 | SSLfatal_data(sc, SSL_AD_NO_ALERT, | |
c48ffbcc RL |
442 | SSL_AD_REASON_OFFSET + alert_descr, |
443 | "SSL alert number %d", alert_descr); | |
38b051a1 | 444 | sc->shutdown |= SSL_RECEIVED_SHUTDOWN; |
eddb067e | 445 | ssl_release_record(sc, rr); |
38b051a1 | 446 | SSL_CTX_remove_session(sc->session_ctx, sc->session); |
eda75751 | 447 | return 0; |
0f113f3e | 448 | } else { |
38b051a1 | 449 | SSLfatal(sc, SSL_AD_ILLEGAL_PARAMETER, SSL_R_UNKNOWN_ALERT_TYPE); |
c2853382 | 450 | return -1; |
0f113f3e MC |
451 | } |
452 | ||
453 | goto start; | |
454 | } | |
455 | ||
38b051a1 | 456 | if (sc->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a |
0f113f3e | 457 | * shutdown */ |
38b051a1 | 458 | sc->rwstate = SSL_NOTHING; |
eddb067e | 459 | ssl_release_record(sc, rr); |
eda75751 | 460 | return 0; |
0f113f3e MC |
461 | } |
462 | ||
eddb067e | 463 | if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) { |
0f113f3e MC |
464 | /* |
465 | * We can't process a CCS now, because previous handshake messages | |
466 | * are still missing, so just drop it. | |
467 | */ | |
eddb067e | 468 | ssl_release_record(sc, rr); |
0f113f3e MC |
469 | goto start; |
470 | } | |
471 | ||
472 | /* | |
473 | * Unexpected handshake message (Client Hello, or protocol violation) | |
474 | */ | |
eddb067e | 475 | if (rr->type == SSL3_RT_HANDSHAKE && !ossl_statem_get_in_handshake(sc)) { |
0f113f3e MC |
476 | struct hm_header_st msg_hdr; |
477 | ||
bd990e25 MC |
478 | /* |
479 | * This may just be a stale retransmit. Also sanity check that we have | |
480 | * at least enough record bytes for a message header | |
481 | */ | |
eddb067e MC |
482 | if (rr->epoch != sc->rlayer.d->r_epoch |
483 | || rr->length < DTLS1_HM_HEADER_LENGTH) { | |
484 | ssl_release_record(sc, rr); | |
0f113f3e MC |
485 | goto start; |
486 | } | |
487 | ||
bd990e25 MC |
488 | dtls1_get_message_header(rr->data, &msg_hdr); |
489 | ||
0f113f3e MC |
490 | /* |
491 | * If we are server, we may have a repeated FINISHED of the client | |
492 | * here, then retransmit our CCS and FINISHED. | |
493 | */ | |
494 | if (msg_hdr.type == SSL3_MT_FINISHED) { | |
38b051a1 | 495 | if (dtls1_check_timeout_num(sc) < 0) { |
c2853382 | 496 | /* SSLfatal) already called */ |
0f113f3e | 497 | return -1; |
c2853382 | 498 | } |
0f113f3e | 499 | |
38b051a1 | 500 | if (dtls1_retransmit_buffered_messages(sc) <= 0) { |
d273b60b | 501 | /* Fail if we encountered a fatal error */ |
38b051a1 | 502 | if (ossl_statem_in_error(sc)) |
d273b60b | 503 | return -1; |
d273b60b | 504 | } |
eddb067e | 505 | ssl_release_record(sc, rr); |
38b051a1 | 506 | if (!(sc->mode & SSL_MODE_AUTO_RETRY)) { |
cffafb5f | 507 | if (!sc->rlayer.rrlmethod->unprocessed_read_pending(sc->rlayer.rrl)) { |
ad962252 MC |
508 | /* no read-ahead left? */ |
509 | BIO *bio; | |
510 | ||
38b051a1 | 511 | sc->rwstate = SSL_READING; |
ad962252 MC |
512 | bio = SSL_get_rbio(s); |
513 | BIO_clear_retry_flags(bio); | |
514 | BIO_set_retry_read(bio); | |
515 | return -1; | |
516 | } | |
517 | } | |
0f113f3e MC |
518 | goto start; |
519 | } | |
520 | ||
c7f47786 MC |
521 | /* |
522 | * To get here we must be trying to read app data but found handshake | |
523 | * data. But if we're trying to read app data, and we're not in init | |
524 | * (which is tested for at the top of this function) then init must be | |
525 | * finished | |
526 | */ | |
b77f3ed1 | 527 | if (!ossl_assert(SSL_is_init_finished(s))) { |
38b051a1 | 528 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
c2853382 | 529 | return -1; |
0f113f3e | 530 | } |
c7f47786 MC |
531 | |
532 | /* We found handshake data, so we're going back into init */ | |
38b051a1 | 533 | ossl_statem_set_in_init(sc, 1); |
c7f47786 | 534 | |
38b051a1 | 535 | i = sc->handshake_func(s); |
c2853382 | 536 | /* SSLfatal() called if appropriate */ |
0f113f3e | 537 | if (i < 0) |
eda75751 | 538 | return i; |
c2853382 | 539 | if (i == 0) |
eda75751 | 540 | return -1; |
0f113f3e | 541 | |
38b051a1 | 542 | if (!(sc->mode & SSL_MODE_AUTO_RETRY)) { |
cffafb5f | 543 | if (!sc->rlayer.rrlmethod->unprocessed_read_pending(sc->rlayer.rrl)) { |
28d59af8 | 544 | /* no read-ahead left? */ |
0f113f3e MC |
545 | BIO *bio; |
546 | /* | |
547 | * In the case where we try to read application data, but we | |
548 | * trigger an SSL handshake, we return -1 with the retry | |
549 | * option set. Otherwise renegotiation may cause nasty | |
550 | * problems in the blocking world | |
551 | */ | |
38b051a1 | 552 | sc->rwstate = SSL_READING; |
0f113f3e MC |
553 | bio = SSL_get_rbio(s); |
554 | BIO_clear_retry_flags(bio); | |
555 | BIO_set_retry_read(bio); | |
eda75751 | 556 | return -1; |
0f113f3e MC |
557 | } |
558 | } | |
559 | goto start; | |
560 | } | |
561 | ||
eddb067e | 562 | switch (rr->type) { |
0f113f3e | 563 | default: |
38b051a1 | 564 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_UNEXPECTED_RECORD); |
c2853382 | 565 | return -1; |
0f113f3e MC |
566 | case SSL3_RT_CHANGE_CIPHER_SPEC: |
567 | case SSL3_RT_ALERT: | |
568 | case SSL3_RT_HANDSHAKE: | |
569 | /* | |
570 | * we already handled all of these, with the possible exception of | |
024f543c MC |
571 | * SSL3_RT_HANDSHAKE when ossl_statem_get_in_handshake(s) is true, but |
572 | * that should not happen when type != rr->type | |
0f113f3e | 573 | */ |
38b051a1 | 574 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, ERR_R_INTERNAL_ERROR); |
c2853382 | 575 | return -1; |
0f113f3e MC |
576 | case SSL3_RT_APPLICATION_DATA: |
577 | /* | |
578 | * At this point, we were expecting handshake data, but have | |
579 | * application data. If the library was running inside ssl3_read() | |
580 | * (i.e. in_read_app_data is set) and it makes sense to read | |
581 | * application data at this point (session renegotiation not yet | |
582 | * started), we will indulge it. | |
583 | */ | |
38b051a1 TM |
584 | if (sc->s3.in_read_app_data && |
585 | (sc->s3.total_renegotiations != 0) && | |
586 | ossl_statem_app_data_allowed(sc)) { | |
587 | sc->s3.in_read_app_data = 2; | |
eda75751 | 588 | return -1; |
0f113f3e | 589 | } else { |
38b051a1 | 590 | SSLfatal(sc, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_UNEXPECTED_RECORD); |
c2853382 | 591 | return -1; |
0f113f3e MC |
592 | } |
593 | } | |
594 | /* not reached */ | |
0f113f3e MC |
595 | } |
596 | ||
0f113f3e MC |
597 | /* |
598 | * Call this to write data in records of type 'type' It will return <= 0 if | |
599 | * not all data has been sent or non-blocking IO. | |
36d16f8e | 600 | */ |
38b051a1 TM |
601 | int dtls1_write_bytes(SSL_CONNECTION *s, int type, const void *buf, |
602 | size_t len, size_t *written) | |
0f113f3e MC |
603 | { |
604 | int i; | |
605 | ||
42bd7a16 | 606 | if (!ossl_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH)) { |
c48ffbcc | 607 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
380a522f | 608 | return -1; |
42bd7a16 | 609 | } |
0f113f3e | 610 | s->rwstate = SSL_NOTHING; |
22d6e854 | 611 | i = do_dtls1_write(s, type, buf, len, written); |
0f113f3e MC |
612 | return i; |
613 | } | |
614 | ||
88bf978e MC |
615 | int do_dtls1_write(SSL_CONNECTION *sc, int type, const unsigned char *buf, |
616 | size_t len, size_t *written) | |
617 | { | |
618 | int i; | |
619 | OSSL_RECORD_TEMPLATE tmpl; | |
620 | SSL *s = SSL_CONNECTION_GET_SSL(sc); | |
88bf978e MC |
621 | int ret; |
622 | ||
88bf978e MC |
623 | /* If we have an alert to send, lets send it */ |
624 | if (sc->s3.alert_dispatch) { | |
625 | i = s->method->ssl_dispatch_alert(s); | |
626 | if (i <= 0) | |
627 | return i; | |
628 | /* if it went, fall through and send more stuff */ | |
629 | } | |
630 | ||
631 | if (len == 0) | |
632 | return 0; | |
633 | ||
634 | if (len > ssl_get_max_send_fragment(sc)) { | |
635 | SSLfatal(sc, SSL_AD_INTERNAL_ERROR, SSL_R_EXCEEDS_MAX_FRAGMENT_SIZE); | |
636 | return 0; | |
637 | } | |
638 | ||
639 | tmpl.type = type; | |
640 | /* | |
641 | * Special case: for hello verify request, client version 1.0 and we | |
642 | * haven't decided which version to use yet send back using version 1.0 | |
643 | * header: otherwise some clients will ignore it. | |
644 | */ | |
645 | if (s->method->version == DTLS_ANY_VERSION | |
646 | && sc->max_proto_version != DTLS1_BAD_VER) | |
647 | tmpl.version = DTLS1_VERSION; | |
648 | else | |
649 | tmpl.version = sc->version; | |
650 | tmpl.buf = buf; | |
651 | tmpl.buflen = len; | |
652 | ||
4cdd198e MC |
653 | ret = HANDLE_RLAYER_WRITE_RETURN(sc, |
654 | sc->rlayer.wrlmethod->write_records(sc->rlayer.wrl, &tmpl, 1)); | |
88bf978e MC |
655 | |
656 | if (ret > 0) | |
657 | *written = (int)len; | |
658 | ||
659 | return ret; | |
0f113f3e | 660 | } |
36d16f8e | 661 | |
b92fc4ae | 662 | void dtls1_increment_epoch(SSL_CONNECTION *s, int rw) |
0f113f3e | 663 | { |
0f113f3e | 664 | if (rw & SSL3_CC_READ) { |
78a39fe7 | 665 | s->rlayer.d->r_epoch++; |
5cb4d646 MC |
666 | |
667 | /* | |
668 | * We must not use any buffered messages received from the previous | |
669 | * epoch | |
670 | */ | |
671 | dtls1_clear_received_buffer(s); | |
0f113f3e | 672 | } else { |
78a39fe7 | 673 | s->rlayer.d->w_epoch++; |
0f113f3e | 674 | } |
0f113f3e | 675 | } |