1 /*
2 * Copyright 2022-2025 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <openssl/rand.h>
11 #include <openssl/err.h>
12 #include "internal/ssl_unwrap.h"
13 #include "internal/quic_channel.h"
14 #include "internal/quic_error.h"
15 #include "internal/quic_rx_depack.h"
16 #include "internal/quic_lcidm.h"
17 #include "internal/quic_srtm.h"
18 #include "internal/qlog_event_helpers.h"
19 #include "internal/quic_txp.h"
20 #include "internal/quic_tls.h"
21 #include "internal/quic_ssl.h"
22 #include "../ssl_local.h"
23 #include "quic_channel_local.h"
24 #include "quic_port_local.h"
25 #include "quic_engine_local.h"
26
27 #define INIT_CRYPTO_RECV_BUF_LEN 16384
28 #define INIT_CRYPTO_SEND_BUF_LEN 16384
29 #define INIT_APP_BUF_LEN 8192
30
31 /*
32 * Interval before we force a PING to ensure NATs don't timeout. This is based
33 * on the lowest commonly seen value of 30 seconds as cited in RFC 9000 s.
34 * 10.1.2.
35 */
36 #define MAX_NAT_INTERVAL (ossl_ms2time(25000))
37
38 /*
39 * Our maximum ACK delay on the TX side. This is up to us to choose. Note that
40 * this could differ from QUIC_DEFAULT_MAX_DELAY in future as that is a protocol
41 * value which determines the value of the maximum ACK delay if the
42 * max_ack_delay transport parameter is not set.
43 */
44 #define DEFAULT_MAX_ACK_DELAY QUIC_DEFAULT_MAX_ACK_DELAY
45
46 DEFINE_LIST_OF_IMPL(ch, QUIC_CHANNEL);
47
48 static void ch_save_err_state(QUIC_CHANNEL *ch);
49 static int ch_rx(QUIC_CHANNEL *ch, int channel_only, int *notify_other_threads);
50 static int ch_tx(QUIC_CHANNEL *ch, int *notify_other_threads);
51 static int ch_tick_tls(QUIC_CHANNEL *ch, int channel_only, int *notify_other_threads);
52 static void ch_rx_handle_packet(QUIC_CHANNEL *ch, int channel_only);
53 static OSSL_TIME ch_determine_next_tick_deadline(QUIC_CHANNEL *ch);
54 static int ch_retry(QUIC_CHANNEL *ch,
55 const unsigned char *retry_token,
56 size_t retry_token_len,
57 const QUIC_CONN_ID *retry_scid,
58 int drop_later_pn);
59 static int ch_restart(QUIC_CHANNEL *ch);
60
61 static void ch_cleanup(QUIC_CHANNEL *ch);
62 static int ch_generate_transport_params(QUIC_CHANNEL *ch);
63 static int ch_on_transport_params(const unsigned char *params,
64 size_t params_len,
65 void *arg);
66 static int ch_on_handshake_alert(void *arg, unsigned char alert_code);
67 static int ch_on_handshake_complete(void *arg);
68 static int ch_on_handshake_yield_secret(uint32_t prot_level, int direction,
69 uint32_t suite_id, EVP_MD *md,
70 const unsigned char *secret,
71 size_t secret_len,
72 void *arg);
73 static int ch_on_crypto_recv_record(const unsigned char **buf,
74 size_t *bytes_read, void *arg);
75 static int ch_on_crypto_release_record(size_t bytes_read, void *arg);
76 static int crypto_ensure_empty(QUIC_RSTREAM *rstream);
77 static int ch_on_crypto_send(const unsigned char *buf, size_t buf_len,
78 size_t *consumed, void *arg);
79 static OSSL_TIME get_time(void *arg);
80 static uint64_t get_stream_limit(int uni, void *arg);
81 static int rx_late_validate(QUIC_PN pn, int pn_space, void *arg);
82 static void rxku_detected(QUIC_PN pn, void *arg);
83 static int ch_retry(QUIC_CHANNEL *ch,
84 const unsigned char *retry_token,
85 size_t retry_token_len,
86 const QUIC_CONN_ID *retry_scid,
87 int drop_later_pn);
88 static void ch_update_idle(QUIC_CHANNEL *ch);
89 static int ch_discard_el(QUIC_CHANNEL *ch,
90 uint32_t enc_level);
91 static void ch_on_idle_timeout(QUIC_CHANNEL *ch);
92 static void ch_update_idle(QUIC_CHANNEL *ch);
93 static void ch_update_ping_deadline(QUIC_CHANNEL *ch);
94 static void ch_on_terminating_timeout(QUIC_CHANNEL *ch);
95 static void ch_start_terminating(QUIC_CHANNEL *ch,
96 const QUIC_TERMINATE_CAUSE *tcause,
97 int force_immediate);
98 static void ch_on_txp_ack_tx(const OSSL_QUIC_FRAME_ACK *ack, uint32_t pn_space,
99 void *arg);
100 static void ch_rx_handle_version_neg(QUIC_CHANNEL *ch, OSSL_QRX_PKT *pkt);
101 static void ch_raise_version_neg_failure(QUIC_CHANNEL *ch);
102 static void ch_record_state_transition(QUIC_CHANNEL *ch, uint32_t new_state);
103
104 DEFINE_LHASH_OF_EX(QUIC_SRT_ELEM);
105
106 QUIC_NEEDS_LOCK
ch_get_qlog(QUIC_CHANNEL * ch)107 static QLOG *ch_get_qlog(QUIC_CHANNEL *ch)
108 {
109 #ifndef OPENSSL_NO_QLOG
110 QLOG_TRACE_INFO qti = {0};
111
112 if (ch->qlog != NULL)
113 return ch->qlog;
114
115 if (!ch->use_qlog)
116 return NULL;
117
118 if (ch->is_server && ch->init_dcid.id_len == 0)
119 return NULL;
120
121 qti.odcid = ch->init_dcid;
122 qti.title = ch->qlog_title;
123 qti.description = NULL;
124 qti.group_id = NULL;
125 qti.is_server = ch->is_server;
126 qti.now_cb = get_time;
127 qti.now_cb_arg = ch;
128 if ((ch->qlog = ossl_qlog_new_from_env(&qti)) == NULL) {
129 ch->use_qlog = 0; /* don't try again */
130 return NULL;
131 }
132
133 return ch->qlog;
134 #else
135 return NULL;
136 #endif
137 }
138
139 QUIC_NEEDS_LOCK
ch_get_qlog_cb(void * arg)140 static QLOG *ch_get_qlog_cb(void *arg)
141 {
142 QUIC_CHANNEL *ch = arg;
143
144 return ch_get_qlog(ch);
145 }
146
147 /*
148 * QUIC Channel Initialization and Teardown
149 * ========================================
150 */
151 #define DEFAULT_INIT_CONN_RXFC_WND (768 * 1024)
152 #define DEFAULT_CONN_RXFC_MAX_WND_MUL 20
153
154 #define DEFAULT_INIT_STREAM_RXFC_WND (512 * 1024)
155 #define DEFAULT_STREAM_RXFC_MAX_WND_MUL 12
156
157 #define DEFAULT_INIT_CONN_MAX_STREAMS 100
158
ch_init(QUIC_CHANNEL * ch)159 static int ch_init(QUIC_CHANNEL *ch)
160 {
161 OSSL_QUIC_TX_PACKETISER_ARGS txp_args = {0};
162 OSSL_QTX_ARGS qtx_args = {0};
163 OSSL_QRX_ARGS qrx_args = {0};
164 QUIC_TLS_ARGS tls_args = {0};
165 uint32_t pn_space;
166 size_t rx_short_dcid_len;
167 size_t tx_init_dcid_len;
168
169 if (ch->port == NULL || ch->lcidm == NULL || ch->srtm == NULL)
170 goto err;
171
172 rx_short_dcid_len = ossl_quic_port_get_rx_short_dcid_len(ch->port);
173 tx_init_dcid_len = ossl_quic_port_get_tx_init_dcid_len(ch->port);
174
175 /* For clients, generate our initial DCID. */
176 if (!ch->is_server
177 && !ossl_quic_gen_rand_conn_id(ch->port->engine->libctx, tx_init_dcid_len,
178 &ch->init_dcid))
179 goto err;
180
181 /* We plug in a network write BIO to the QTX later when we get one. */
182 qtx_args.libctx = ch->port->engine->libctx;
183 qtx_args.get_qlog_cb = ch_get_qlog_cb;
184 qtx_args.get_qlog_cb_arg = ch;
185 qtx_args.mdpl = QUIC_MIN_INITIAL_DGRAM_LEN;
186 ch->rx_max_udp_payload_size = qtx_args.mdpl;
187
188 ch->ping_deadline = ossl_time_infinite();
189
190 ch->qtx = ossl_qtx_new(&qtx_args);
191 if (ch->qtx == NULL)
192 goto err;
193
194 ch->txpim = ossl_quic_txpim_new();
195 if (ch->txpim == NULL)
196 goto err;
197
198 ch->cfq = ossl_quic_cfq_new();
199 if (ch->cfq == NULL)
200 goto err;
201
202 if (!ossl_quic_txfc_init(&ch->conn_txfc, NULL))
203 goto err;
204
205 /*
206 * Note: The TP we transmit governs what the peer can transmit and thus
207 * applies to the RXFC.
208 */
209 ch->tx_init_max_stream_data_bidi_local = DEFAULT_INIT_STREAM_RXFC_WND;
210 ch->tx_init_max_stream_data_bidi_remote = DEFAULT_INIT_STREAM_RXFC_WND;
211 ch->tx_init_max_stream_data_uni = DEFAULT_INIT_STREAM_RXFC_WND;
212
213 if (!ossl_quic_rxfc_init(&ch->conn_rxfc, NULL,
214 DEFAULT_INIT_CONN_RXFC_WND,
215 DEFAULT_CONN_RXFC_MAX_WND_MUL *
216 DEFAULT_INIT_CONN_RXFC_WND,
217 get_time, ch))
218 goto err;
219
220 for (pn_space = QUIC_PN_SPACE_INITIAL; pn_space < QUIC_PN_SPACE_NUM; ++pn_space)
221 if (!ossl_quic_rxfc_init_standalone(&ch->crypto_rxfc[pn_space],
222 INIT_CRYPTO_RECV_BUF_LEN,
223 get_time, ch))
224 goto err;
225
226 if (!ossl_quic_rxfc_init_standalone(&ch->max_streams_bidi_rxfc,
227 DEFAULT_INIT_CONN_MAX_STREAMS,
228 get_time, ch))
229 goto err;
230
231 if (!ossl_quic_rxfc_init_standalone(&ch->max_streams_uni_rxfc,
232 DEFAULT_INIT_CONN_MAX_STREAMS,
233 get_time, ch))
234 goto err;
235
236 if (!ossl_statm_init(&ch->statm))
237 goto err;
238
239 ch->have_statm = 1;
240 ch->cc_method = &ossl_cc_newreno_method;
241 if ((ch->cc_data = ch->cc_method->new(get_time, ch)) == NULL)
242 goto err;
243
244 if ((ch->ackm = ossl_ackm_new(get_time, ch, &ch->statm,
245 ch->cc_method, ch->cc_data,
246 ch->is_server)) == NULL)
247 goto err;
248
249 if (!ossl_quic_stream_map_init(&ch->qsm, get_stream_limit, ch,
250 &ch->max_streams_bidi_rxfc,
251 &ch->max_streams_uni_rxfc,
252 ch->is_server))
253 goto err;
254
255 ch->have_qsm = 1;
256
257 if (!ch->is_server
258 && !ossl_quic_lcidm_generate_initial(ch->lcidm, ch, &ch->init_scid))
259 goto err;
260
261 txp_args.cur_scid = ch->init_scid;
262 txp_args.cur_dcid = ch->init_dcid;
263 txp_args.ack_delay_exponent = 3;
264 txp_args.qtx = ch->qtx;
265 txp_args.txpim = ch->txpim;
266 txp_args.cfq = ch->cfq;
267 txp_args.ackm = ch->ackm;
268 txp_args.qsm = &ch->qsm;
269 txp_args.conn_txfc = &ch->conn_txfc;
270 txp_args.conn_rxfc = &ch->conn_rxfc;
271 txp_args.max_streams_bidi_rxfc = &ch->max_streams_bidi_rxfc;
272 txp_args.max_streams_uni_rxfc = &ch->max_streams_uni_rxfc;
273 txp_args.cc_method = ch->cc_method;
274 txp_args.cc_data = ch->cc_data;
275 txp_args.now = get_time;
276 txp_args.now_arg = ch;
277 txp_args.get_qlog_cb = ch_get_qlog_cb;
278 txp_args.get_qlog_cb_arg = ch;
279 txp_args.protocol_version = QUIC_VERSION_1;
280
281 for (pn_space = QUIC_PN_SPACE_INITIAL; pn_space < QUIC_PN_SPACE_NUM; ++pn_space) {
282 ch->crypto_send[pn_space] = ossl_quic_sstream_new(INIT_CRYPTO_SEND_BUF_LEN);
283 if (ch->crypto_send[pn_space] == NULL)
284 goto err;
285
286 txp_args.crypto[pn_space] = ch->crypto_send[pn_space];
287 }
288
289 ch->txp = ossl_quic_tx_packetiser_new(&txp_args);
290 if (ch->txp == NULL)
291 goto err;
292
293 /* clients have no amplification limit, so are considered always valid */
294 if (!ch->is_server)
295 ossl_quic_tx_packetiser_set_validated(ch->txp);
296
297 ossl_quic_tx_packetiser_set_ack_tx_cb(ch->txp, ch_on_txp_ack_tx, ch);
298
299 /*
300 * qrx does not exist yet, then we must be dealing with client channel
301 * (QUIC connection initiator).
302 * If qrx exists already, then we are dealing with server channel which
303 * qrx gets created by port_default_packet_handler() before
304 * port_default_packet_handler() accepts connection and creates channel
305 * for it.
306 * The exception here is tserver which always creates channel,
307 * before the first packet is ever seen.
308 */
309 if (ch->qrx == NULL && ch->is_tserver_ch == 0) {
310 /* we are regular client, create channel */
311 qrx_args.libctx = ch->port->engine->libctx;
312 qrx_args.demux = ch->port->demux;
313 qrx_args.short_conn_id_len = rx_short_dcid_len;
314 qrx_args.max_deferred = 32;
315
316 if ((ch->qrx = ossl_qrx_new(&qrx_args)) == NULL)
317 goto err;
318 }
319
320 if (ch->qrx != NULL) {
321 /*
322 * callbacks for channels associated with tserver's port
323 * are set up later when we call ossl_quic_channel_bind_qrx()
324 * in port_default_packet_handler()
325 */
326 if (!ossl_qrx_set_late_validation_cb(ch->qrx,
327 rx_late_validate,
328 ch))
329 goto err;
330
331 if (!ossl_qrx_set_key_update_cb(ch->qrx,
332 rxku_detected,
333 ch))
334 goto err;
335 }
336
337
338 for (pn_space = QUIC_PN_SPACE_INITIAL; pn_space < QUIC_PN_SPACE_NUM; ++pn_space) {
339 ch->crypto_recv[pn_space] = ossl_quic_rstream_new(NULL, NULL, 0);
340 if (ch->crypto_recv[pn_space] == NULL)
341 goto err;
342 }
343
344 /* Plug in the TLS handshake layer. */
345 tls_args.s = ch->tls;
346 tls_args.crypto_send_cb = ch_on_crypto_send;
347 tls_args.crypto_send_cb_arg = ch;
348 tls_args.crypto_recv_rcd_cb = ch_on_crypto_recv_record;
349 tls_args.crypto_recv_rcd_cb_arg = ch;
350 tls_args.crypto_release_rcd_cb = ch_on_crypto_release_record;
351 tls_args.crypto_release_rcd_cb_arg = ch;
352 tls_args.yield_secret_cb = ch_on_handshake_yield_secret;
353 tls_args.yield_secret_cb_arg = ch;
354 tls_args.got_transport_params_cb = ch_on_transport_params;
355 tls_args.got_transport_params_cb_arg= ch;
356 tls_args.handshake_complete_cb = ch_on_handshake_complete;
357 tls_args.handshake_complete_cb_arg = ch;
358 tls_args.alert_cb = ch_on_handshake_alert;
359 tls_args.alert_cb_arg = ch;
360 tls_args.is_server = ch->is_server;
361 tls_args.ossl_quic = 1;
362
363 if ((ch->qtls = ossl_quic_tls_new(&tls_args)) == NULL)
364 goto err;
365
366 ch->tx_max_ack_delay = DEFAULT_MAX_ACK_DELAY;
367 ch->rx_max_ack_delay = QUIC_DEFAULT_MAX_ACK_DELAY;
368 ch->rx_ack_delay_exp = QUIC_DEFAULT_ACK_DELAY_EXP;
369 ch->rx_active_conn_id_limit = QUIC_MIN_ACTIVE_CONN_ID_LIMIT;
370 ch->tx_enc_level = QUIC_ENC_LEVEL_INITIAL;
371 ch->rx_enc_level = QUIC_ENC_LEVEL_INITIAL;
372 ch->txku_threshold_override = UINT64_MAX;
373
374 ch->max_idle_timeout_local_req = QUIC_DEFAULT_IDLE_TIMEOUT;
375 ch->max_idle_timeout_remote_req = 0;
376 ch->max_idle_timeout = ch->max_idle_timeout_local_req;
377
378 ossl_ackm_set_tx_max_ack_delay(ch->ackm, ossl_ms2time(ch->tx_max_ack_delay));
379 ossl_ackm_set_rx_max_ack_delay(ch->ackm, ossl_ms2time(ch->rx_max_ack_delay));
380
381 ch_update_idle(ch);
382 ossl_list_ch_insert_tail(&ch->port->channel_list, ch);
383 ch->on_port_list = 1;
384 return 1;
385
386 err:
387 ch_cleanup(ch);
388 return 0;
389 }
390
ch_cleanup(QUIC_CHANNEL * ch)391 static void ch_cleanup(QUIC_CHANNEL *ch)
392 {
393 uint32_t pn_space;
394
395 if (ch->ackm != NULL)
396 for (pn_space = QUIC_PN_SPACE_INITIAL;
397 pn_space < QUIC_PN_SPACE_NUM;
398 ++pn_space)
399 ossl_ackm_on_pkt_space_discarded(ch->ackm, pn_space);
400
401 ossl_quic_lcidm_cull(ch->lcidm, ch);
402 ossl_quic_srtm_cull(ch->srtm, ch);
403 ossl_quic_tx_packetiser_free(ch->txp);
404 ossl_quic_txpim_free(ch->txpim);
405 ossl_quic_cfq_free(ch->cfq);
406 ossl_qtx_free(ch->qtx);
407 if (ch->cc_data != NULL)
408 ch->cc_method->free(ch->cc_data);
409 if (ch->have_statm)
410 ossl_statm_destroy(&ch->statm);
411 ossl_ackm_free(ch->ackm);
412
413 if (ch->have_qsm)
414 ossl_quic_stream_map_cleanup(&ch->qsm);
415
416 for (pn_space = QUIC_PN_SPACE_INITIAL; pn_space < QUIC_PN_SPACE_NUM; ++pn_space) {
417 ossl_quic_sstream_free(ch->crypto_send[pn_space]);
418 ossl_quic_rstream_free(ch->crypto_recv[pn_space]);
419 }
420
421 ossl_qrx_pkt_release(ch->qrx_pkt);
422 ch->qrx_pkt = NULL;
423
424 ossl_quic_tls_free(ch->qtls);
425 ossl_qrx_free(ch->qrx);
426 OPENSSL_free(ch->local_transport_params);
427 OPENSSL_free((char *)ch->terminate_cause.reason);
428 OSSL_ERR_STATE_free(ch->err_state);
429 OPENSSL_free(ch->ack_range_scratch);
430 OPENSSL_free(ch->pending_new_token);
431
432 if (ch->on_port_list) {
433 ossl_list_ch_remove(&ch->port->channel_list, ch);
434 ch->on_port_list = 0;
435 }
436
437 #ifndef OPENSSL_NO_QLOG
438 if (ch->qlog != NULL)
439 ossl_qlog_flush(ch->qlog); /* best effort */
440
441 OPENSSL_free(ch->qlog_title);
442 ossl_qlog_free(ch->qlog);
443 #endif
444 }
445
ossl_quic_channel_init(QUIC_CHANNEL * ch)446 int ossl_quic_channel_init(QUIC_CHANNEL *ch)
447 {
448 return ch_init(ch);
449 }
450
ossl_quic_channel_bind_qrx(QUIC_CHANNEL * tserver_ch,OSSL_QRX * qrx)451 void ossl_quic_channel_bind_qrx(QUIC_CHANNEL *tserver_ch, OSSL_QRX *qrx)
452 {
453 if (tserver_ch->qrx == NULL && tserver_ch->is_tserver_ch == 1) {
454 tserver_ch->qrx = qrx;
455 ossl_qrx_set_late_validation_cb(tserver_ch->qrx, rx_late_validate,
456 tserver_ch);
457 ossl_qrx_set_key_update_cb(tserver_ch->qrx, rxku_detected,
458 tserver_ch);
459 }
460 }
461
ossl_quic_channel_alloc(const QUIC_CHANNEL_ARGS * args)462 QUIC_CHANNEL *ossl_quic_channel_alloc(const QUIC_CHANNEL_ARGS *args)
463 {
464 QUIC_CHANNEL *ch = NULL;
465
466 if ((ch = OPENSSL_zalloc(sizeof(*ch))) == NULL)
467 return NULL;
468
469 ch->port = args->port;
470 ch->is_server = args->is_server;
471 ch->tls = args->tls;
472 ch->lcidm = args->lcidm;
473 ch->srtm = args->srtm;
474 ch->qrx = args->qrx;
475 ch->is_tserver_ch = args->is_tserver_ch;
476 #ifndef OPENSSL_NO_QLOG
477 ch->use_qlog = args->use_qlog;
478
479 if (ch->use_qlog && args->qlog_title != NULL) {
480 if ((ch->qlog_title = OPENSSL_strdup(args->qlog_title)) == NULL) {
481 OPENSSL_free(ch);
482 return NULL;
483 }
484 }
485 #endif
486
487 return ch;
488 }
489
ossl_quic_channel_free(QUIC_CHANNEL * ch)490 void ossl_quic_channel_free(QUIC_CHANNEL *ch)
491 {
492 if (ch == NULL)
493 return;
494
495 ch_cleanup(ch);
496 OPENSSL_free(ch);
497 }
498
499 /* Set mutator callbacks for test framework support */
ossl_quic_channel_set_mutator(QUIC_CHANNEL * ch,ossl_mutate_packet_cb mutatecb,ossl_finish_mutate_cb finishmutatecb,void * mutatearg)500 int ossl_quic_channel_set_mutator(QUIC_CHANNEL *ch,
501 ossl_mutate_packet_cb mutatecb,
502 ossl_finish_mutate_cb finishmutatecb,
503 void *mutatearg)
504 {
505 if (ch->qtx == NULL)
506 return 0;
507
508 ossl_qtx_set_mutator(ch->qtx, mutatecb, finishmutatecb, mutatearg);
509 return 1;
510 }
511
ossl_quic_channel_get_peer_addr(QUIC_CHANNEL * ch,BIO_ADDR * peer_addr)512 int ossl_quic_channel_get_peer_addr(QUIC_CHANNEL *ch, BIO_ADDR *peer_addr)
513 {
514 if (!ch->addressed_mode)
515 return 0;
516
517 return BIO_ADDR_copy(peer_addr, &ch->cur_peer_addr);
518 }
519
ossl_quic_channel_set_peer_addr(QUIC_CHANNEL * ch,const BIO_ADDR * peer_addr)520 int ossl_quic_channel_set_peer_addr(QUIC_CHANNEL *ch, const BIO_ADDR *peer_addr)
521 {
522 if (ch->state != QUIC_CHANNEL_STATE_IDLE)
523 return 0;
524
525 if (peer_addr == NULL || BIO_ADDR_family(peer_addr) == AF_UNSPEC) {
526 BIO_ADDR_clear(&ch->cur_peer_addr);
527 ch->addressed_mode = 0;
528 return 1;
529 }
530
531 if (!BIO_ADDR_copy(&ch->cur_peer_addr, peer_addr)) {
532 ch->addressed_mode = 0;
533 return 0;
534 }
535 ch->addressed_mode = 1;
536
537 return 1;
538 }
539
ossl_quic_channel_get_reactor(QUIC_CHANNEL * ch)540 QUIC_REACTOR *ossl_quic_channel_get_reactor(QUIC_CHANNEL *ch)
541 {
542 return ossl_quic_port_get0_reactor(ch->port);
543 }
544
ossl_quic_channel_get_qsm(QUIC_CHANNEL * ch)545 QUIC_STREAM_MAP *ossl_quic_channel_get_qsm(QUIC_CHANNEL *ch)
546 {
547 return &ch->qsm;
548 }
549
ossl_quic_channel_get_statm(QUIC_CHANNEL * ch)550 OSSL_STATM *ossl_quic_channel_get_statm(QUIC_CHANNEL *ch)
551 {
552 return &ch->statm;
553 }
554
ossl_quic_channel_get0_tls(QUIC_CHANNEL * ch)555 SSL *ossl_quic_channel_get0_tls(QUIC_CHANNEL *ch)
556 {
557 return ch->tls;
558 }
559
free_buf_mem(unsigned char * buf,size_t buf_len,void * arg)560 static void free_buf_mem(unsigned char *buf, size_t buf_len, void *arg)
561 {
562 BUF_MEM_free((BUF_MEM *)arg);
563 }
564
ossl_quic_channel_schedule_new_token(QUIC_CHANNEL * ch,const unsigned char * token,size_t token_len)565 int ossl_quic_channel_schedule_new_token(QUIC_CHANNEL *ch,
566 const unsigned char *token,
567 size_t token_len)
568 {
569 int rc = 0;
570 QUIC_CFQ_ITEM *cfq_item;
571 WPACKET wpkt;
572 BUF_MEM *buf_mem = NULL;
573 size_t l = 0;
574
575 buf_mem = BUF_MEM_new();
576 if (buf_mem == NULL)
577 goto err;
578
579 if (!WPACKET_init(&wpkt, buf_mem))
580 goto err;
581
582 if (!ossl_quic_wire_encode_frame_new_token(&wpkt, token,
583 token_len)) {
584 WPACKET_cleanup(&wpkt);
585 goto err;
586 }
587
588 WPACKET_finish(&wpkt);
589
590 if (!WPACKET_get_total_written(&wpkt, &l))
591 goto err;
592
593 cfq_item = ossl_quic_cfq_add_frame(ch->cfq, 1,
594 QUIC_PN_SPACE_APP,
595 OSSL_QUIC_FRAME_TYPE_NEW_TOKEN, 0,
596 (unsigned char *)buf_mem->data, l,
597 free_buf_mem,
598 buf_mem);
599 if (cfq_item == NULL)
600 goto err;
601
602 rc = 1;
603 err:
604 if (!rc)
605 BUF_MEM_free(buf_mem);
606 return rc;
607 }
608
ossl_quic_channel_get_short_header_conn_id_len(QUIC_CHANNEL * ch)609 size_t ossl_quic_channel_get_short_header_conn_id_len(QUIC_CHANNEL *ch)
610 {
611 return ossl_quic_port_get_rx_short_dcid_len(ch->port);
612 }
613
ossl_quic_channel_get_stream_by_id(QUIC_CHANNEL * ch,uint64_t stream_id)614 QUIC_STREAM *ossl_quic_channel_get_stream_by_id(QUIC_CHANNEL *ch,
615 uint64_t stream_id)
616 {
617 return ossl_quic_stream_map_get_by_id(&ch->qsm, stream_id);
618 }
619
ossl_quic_channel_is_active(const QUIC_CHANNEL * ch)620 int ossl_quic_channel_is_active(const QUIC_CHANNEL *ch)
621 {
622 return ch != NULL && ch->state == QUIC_CHANNEL_STATE_ACTIVE;
623 }
624
ossl_quic_channel_is_closing(const QUIC_CHANNEL * ch)625 int ossl_quic_channel_is_closing(const QUIC_CHANNEL *ch)
626 {
627 return ch->state == QUIC_CHANNEL_STATE_TERMINATING_CLOSING;
628 }
629
ossl_quic_channel_is_draining(const QUIC_CHANNEL * ch)630 static int ossl_quic_channel_is_draining(const QUIC_CHANNEL *ch)
631 {
632 return ch->state == QUIC_CHANNEL_STATE_TERMINATING_DRAINING;
633 }
634
ossl_quic_channel_is_terminating(const QUIC_CHANNEL * ch)635 static int ossl_quic_channel_is_terminating(const QUIC_CHANNEL *ch)
636 {
637 return ossl_quic_channel_is_closing(ch)
638 || ossl_quic_channel_is_draining(ch);
639 }
640
ossl_quic_channel_is_terminated(const QUIC_CHANNEL * ch)641 int ossl_quic_channel_is_terminated(const QUIC_CHANNEL *ch)
642 {
643 return ch->state == QUIC_CHANNEL_STATE_TERMINATED;
644 }
645
ossl_quic_channel_is_term_any(const QUIC_CHANNEL * ch)646 int ossl_quic_channel_is_term_any(const QUIC_CHANNEL *ch)
647 {
648 return ossl_quic_channel_is_terminating(ch)
649 || ossl_quic_channel_is_terminated(ch);
650 }
651
652 const QUIC_TERMINATE_CAUSE *
ossl_quic_channel_get_terminate_cause(const QUIC_CHANNEL * ch)653 ossl_quic_channel_get_terminate_cause(const QUIC_CHANNEL *ch)
654 {
655 return ossl_quic_channel_is_term_any(ch) ? &ch->terminate_cause : NULL;
656 }
657
ossl_quic_channel_is_handshake_complete(const QUIC_CHANNEL * ch)658 int ossl_quic_channel_is_handshake_complete(const QUIC_CHANNEL *ch)
659 {
660 return ch->handshake_complete;
661 }
662
ossl_quic_channel_is_handshake_confirmed(const QUIC_CHANNEL * ch)663 int ossl_quic_channel_is_handshake_confirmed(const QUIC_CHANNEL *ch)
664 {
665 return ch->handshake_confirmed;
666 }
667
ossl_quic_channel_get0_demux(QUIC_CHANNEL * ch)668 QUIC_DEMUX *ossl_quic_channel_get0_demux(QUIC_CHANNEL *ch)
669 {
670 return ch->port->demux;
671 }
672
ossl_quic_channel_get0_port(QUIC_CHANNEL * ch)673 QUIC_PORT *ossl_quic_channel_get0_port(QUIC_CHANNEL *ch)
674 {
675 return ch->port;
676 }
677
ossl_quic_channel_get0_engine(QUIC_CHANNEL * ch)678 QUIC_ENGINE *ossl_quic_channel_get0_engine(QUIC_CHANNEL *ch)
679 {
680 return ossl_quic_port_get0_engine(ch->port);
681 }
682
ossl_quic_channel_get_mutex(QUIC_CHANNEL * ch)683 CRYPTO_MUTEX *ossl_quic_channel_get_mutex(QUIC_CHANNEL *ch)
684 {
685 return ossl_quic_port_get0_mutex(ch->port);
686 }
687
ossl_quic_channel_has_pending(const QUIC_CHANNEL * ch)688 int ossl_quic_channel_has_pending(const QUIC_CHANNEL *ch)
689 {
690 return ossl_quic_demux_has_pending(ch->port->demux)
691 || ossl_qrx_processed_read_pending(ch->qrx);
692 }
693
694 /*
695 * QUIC Channel: Callbacks from Miscellaneous Subsidiary Components
696 * ================================================================
697 */
698
699 /* Used by various components. */
get_time(void * arg)700 static OSSL_TIME get_time(void *arg)
701 {
702 QUIC_CHANNEL *ch = arg;
703
704 return ossl_quic_port_get_time(ch->port);
705 }
706
707 /* Used by QSM. */
get_stream_limit(int uni,void * arg)708 static uint64_t get_stream_limit(int uni, void *arg)
709 {
710 QUIC_CHANNEL *ch = arg;
711
712 return uni ? ch->max_local_streams_uni : ch->max_local_streams_bidi;
713 }
714
715 /*
716 * Called by QRX to determine if a packet is potentially invalid before trying
717 * to decrypt it.
718 */
rx_late_validate(QUIC_PN pn,int pn_space,void * arg)719 static int rx_late_validate(QUIC_PN pn, int pn_space, void *arg)
720 {
721 QUIC_CHANNEL *ch = arg;
722
723 /* Potential duplicates should not be processed. */
724 if (!ossl_ackm_is_rx_pn_processable(ch->ackm, pn, pn_space))
725 return 0;
726
727 return 1;
728 }
729
730 /*
731 * Triggers a TXKU (whether spontaneous or solicited). Does not check whether
732 * spontaneous TXKU is currently allowed.
733 */
734 QUIC_NEEDS_LOCK
ch_trigger_txku(QUIC_CHANNEL * ch)735 static void ch_trigger_txku(QUIC_CHANNEL *ch)
736 {
737 uint64_t next_pn
738 = ossl_quic_tx_packetiser_get_next_pn(ch->txp, QUIC_PN_SPACE_APP);
739
740 if (!ossl_quic_pn_valid(next_pn)
741 || !ossl_qtx_trigger_key_update(ch->qtx)) {
742 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_INTERNAL_ERROR, 0,
743 "key update");
744 return;
745 }
746
747 ch->txku_in_progress = 1;
748 ch->txku_pn = next_pn;
749 ch->rxku_expected = ch->ku_locally_initiated;
750 }
751
752 QUIC_NEEDS_LOCK
txku_in_progress(QUIC_CHANNEL * ch)753 static int txku_in_progress(QUIC_CHANNEL *ch)
754 {
755 if (ch->txku_in_progress
756 && ossl_ackm_get_largest_acked(ch->ackm, QUIC_PN_SPACE_APP) >= ch->txku_pn) {
757 OSSL_TIME pto = ossl_ackm_get_pto_duration(ch->ackm);
758
759 /*
760 * RFC 9001 s. 6.5: Endpoints SHOULD wait three times the PTO before
761 * initiating a key update after receiving an acknowledgment that
762 * confirms that the previous key update was received.
763 *
764 * Note that by the above wording, this period starts from when we get
765 * the ack for a TXKU-triggering packet, not when the TXKU is initiated.
766 * So we defer TXKU cooldown deadline calculation to this point.
767 */
768 ch->txku_in_progress = 0;
769 ch->txku_cooldown_deadline = ossl_time_add(get_time(ch),
770 ossl_time_multiply(pto, 3));
771 }
772
773 return ch->txku_in_progress;
774 }
775
776 QUIC_NEEDS_LOCK
txku_allowed(QUIC_CHANNEL * ch)777 static int txku_allowed(QUIC_CHANNEL *ch)
778 {
779 return ch->tx_enc_level == QUIC_ENC_LEVEL_1RTT /* Sanity check. */
780 /* Strict RFC 9001 criterion for TXKU. */
781 && ch->handshake_confirmed
782 && !txku_in_progress(ch);
783 }
784
785 QUIC_NEEDS_LOCK
txku_recommendable(QUIC_CHANNEL * ch)786 static int txku_recommendable(QUIC_CHANNEL *ch)
787 {
788 if (!txku_allowed(ch))
789 return 0;
790
791 return
792 /* Recommended RFC 9001 criterion for TXKU. */
793 ossl_time_compare(get_time(ch), ch->txku_cooldown_deadline) >= 0
794 /* Some additional sensible criteria. */
795 && !ch->rxku_in_progress
796 && !ch->rxku_pending_confirm;
797 }
798
799 QUIC_NEEDS_LOCK
txku_desirable(QUIC_CHANNEL * ch)800 static int txku_desirable(QUIC_CHANNEL *ch)
801 {
802 uint64_t cur_pkt_count, max_pkt_count, thresh_pkt_count;
803 const uint32_t enc_level = QUIC_ENC_LEVEL_1RTT;
804
805 /* Check AEAD limit to determine if we should perform a spontaneous TXKU. */
806 cur_pkt_count = ossl_qtx_get_cur_epoch_pkt_count(ch->qtx, enc_level);
807 max_pkt_count = ossl_qtx_get_max_epoch_pkt_count(ch->qtx, enc_level);
808
809 thresh_pkt_count = max_pkt_count / 2;
810 if (ch->txku_threshold_override != UINT64_MAX)
811 thresh_pkt_count = ch->txku_threshold_override;
812
813 return cur_pkt_count >= thresh_pkt_count;
814 }
815
816 QUIC_NEEDS_LOCK
ch_maybe_trigger_spontaneous_txku(QUIC_CHANNEL * ch)817 static void ch_maybe_trigger_spontaneous_txku(QUIC_CHANNEL *ch)
818 {
819 if (!txku_recommendable(ch) || !txku_desirable(ch))
820 return;
821
822 ch->ku_locally_initiated = 1;
823 ch_trigger_txku(ch);
824 }
825
826 QUIC_NEEDS_LOCK
rxku_allowed(QUIC_CHANNEL * ch)827 static int rxku_allowed(QUIC_CHANNEL *ch)
828 {
829 /*
830 * RFC 9001 s. 6.1: An endpoint MUST NOT initiate a key update prior to
831 * having confirmed the handshake (Section 4.1.2).
832 *
833 * RFC 9001 s. 6.1: An endpoint MUST NOT initiate a subsequent key update
834 * unless it has received an acknowledgment for a packet that was sent
835 * protected with keys from the current key phase.
836 *
837 * RFC 9001 s. 6.2: If an endpoint detects a second update before it has
838 * sent any packets with updated keys containing an acknowledgment for the
839 * packet that initiated the key update, it indicates that its peer has
840 * updated keys twice without awaiting confirmation. An endpoint MAY treat
841 * such consecutive key updates as a connection error of type
842 * KEY_UPDATE_ERROR.
843 */
844 return ch->handshake_confirmed && !ch->rxku_pending_confirm;
845 }
846
847 /*
848 * Called when the QRX detects a new RX key update event.
849 */
850 enum rxku_decision {
851 DECISION_RXKU_ONLY,
852 DECISION_PROTOCOL_VIOLATION,
853 DECISION_SOLICITED_TXKU
854 };
855
856 /* Called when the QRX detects a key update has occurred. */
857 QUIC_NEEDS_LOCK
rxku_detected(QUIC_PN pn,void * arg)858 static void rxku_detected(QUIC_PN pn, void *arg)
859 {
860 QUIC_CHANNEL *ch = arg;
861 enum rxku_decision decision;
862 OSSL_TIME pto;
863
864 /*
865 * Note: rxku_in_progress is always 0 here as an RXKU cannot be detected
866 * when we are still in UPDATING or COOLDOWN (see quic_record_rx.h).
867 */
868 assert(!ch->rxku_in_progress);
869
870 if (!rxku_allowed(ch))
871 /* Is RXKU even allowed at this time? */
872 decision = DECISION_PROTOCOL_VIOLATION;
873
874 else if (ch->ku_locally_initiated)
875 /*
876 * If this key update was locally initiated (meaning that this detected
877 * RXKU event is a result of our own spontaneous TXKU), we do not
878 * trigger another TXKU; after all, to do so would result in an infinite
879 * ping-pong of key updates. We still process it as an RXKU.
880 */
881 decision = DECISION_RXKU_ONLY;
882
883 else
884 /*
885 * Otherwise, a peer triggering a KU means we have to trigger a KU also.
886 */
887 decision = DECISION_SOLICITED_TXKU;
888
889 if (decision == DECISION_PROTOCOL_VIOLATION) {
890 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_KEY_UPDATE_ERROR,
891 0, "RX key update again too soon");
892 return;
893 }
894
895 pto = ossl_ackm_get_pto_duration(ch->ackm);
896
897 ch->ku_locally_initiated = 0;
898 ch->rxku_in_progress = 1;
899 ch->rxku_pending_confirm = 1;
900 ch->rxku_trigger_pn = pn;
901 ch->rxku_update_end_deadline = ossl_time_add(get_time(ch), pto);
902 ch->rxku_expected = 0;
903
904 if (decision == DECISION_SOLICITED_TXKU)
905 /* NOT gated by usual txku_allowed() */
906 ch_trigger_txku(ch);
907
908 /*
909 * Ordinarily, we only generate ACK when some ACK-eliciting frame has been
910 * received. In some cases, this may not occur for a long time, for example
911 * if transmission of application data is going in only one direction and
912 * nothing else is happening with the connection. However, since the peer
913 * cannot initiate a subsequent (spontaneous) TXKU until its prior
914 * (spontaneous or solicited) TXKU has completed - meaning that prior
915 * TXKU's trigger packet (or subsequent packet) has been acknowledged, this
916 * can lead to very long times before a TXKU is considered 'completed'.
917 * Optimise this by forcing ACK generation after triggering TXKU.
918 * (Basically, we consider a RXKU event something that is 'ACK-eliciting',
919 * which it more or less should be; it is necessarily separate from ordinary
920 * processing of ACK-eliciting frames as key update is not indicated via a
921 * frame.)
922 */
923 ossl_quic_tx_packetiser_schedule_ack(ch->txp, QUIC_PN_SPACE_APP);
924 }
925
926 /* Called per tick to handle RXKU timer events. */
927 QUIC_NEEDS_LOCK
ch_rxku_tick(QUIC_CHANNEL * ch)928 static void ch_rxku_tick(QUIC_CHANNEL *ch)
929 {
930 if (!ch->rxku_in_progress
931 || ossl_time_compare(get_time(ch), ch->rxku_update_end_deadline) < 0)
932 return;
933
934 ch->rxku_update_end_deadline = ossl_time_infinite();
935 ch->rxku_in_progress = 0;
936
937 if (!ossl_qrx_key_update_timeout(ch->qrx, /*normal=*/1))
938 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_INTERNAL_ERROR, 0,
939 "RXKU cooldown internal error");
940 }
941
942 QUIC_NEEDS_LOCK
ch_on_txp_ack_tx(const OSSL_QUIC_FRAME_ACK * ack,uint32_t pn_space,void * arg)943 static void ch_on_txp_ack_tx(const OSSL_QUIC_FRAME_ACK *ack, uint32_t pn_space,
944 void *arg)
945 {
946 QUIC_CHANNEL *ch = arg;
947
948 if (pn_space != QUIC_PN_SPACE_APP || !ch->rxku_pending_confirm
949 || !ossl_quic_frame_ack_contains_pn(ack, ch->rxku_trigger_pn))
950 return;
951
952 /*
953 * Defer clearing rxku_pending_confirm until TXP generate call returns
954 * successfully.
955 */
956 ch->rxku_pending_confirm_done = 1;
957 }
958
959 /*
960 * QUIC Channel: Handshake Layer Event Handling
961 * ============================================
962 */
ch_on_crypto_send(const unsigned char * buf,size_t buf_len,size_t * consumed,void * arg)963 static int ch_on_crypto_send(const unsigned char *buf, size_t buf_len,
964 size_t *consumed, void *arg)
965 {
966 int ret;
967 QUIC_CHANNEL *ch = arg;
968 uint32_t enc_level = ch->tx_enc_level;
969 uint32_t pn_space = ossl_quic_enc_level_to_pn_space(enc_level);
970 QUIC_SSTREAM *sstream = ch->crypto_send[pn_space];
971
972 if (!ossl_assert(sstream != NULL))
973 return 0;
974
975 ret = ossl_quic_sstream_append(sstream, buf, buf_len, consumed);
976 return ret;
977 }
978
crypto_ensure_empty(QUIC_RSTREAM * rstream)979 static int crypto_ensure_empty(QUIC_RSTREAM *rstream)
980 {
981 size_t avail = 0;
982 int is_fin = 0;
983
984 if (rstream == NULL)
985 return 1;
986
987 if (!ossl_quic_rstream_available(rstream, &avail, &is_fin))
988 return 0;
989
990 return avail == 0;
991 }
992
ch_on_crypto_recv_record(const unsigned char ** buf,size_t * bytes_read,void * arg)993 static int ch_on_crypto_recv_record(const unsigned char **buf,
994 size_t *bytes_read, void *arg)
995 {
996 QUIC_CHANNEL *ch = arg;
997 QUIC_RSTREAM *rstream;
998 int is_fin = 0; /* crypto stream is never finished, so we don't use this */
999 uint32_t i;
1000
1001 /*
1002 * After we move to a later EL we must not allow our peer to send any new
1003 * bytes in the crypto stream on a previous EL. Retransmissions of old bytes
1004 * are allowed.
1005 *
1006 * In practice we will only move to a new EL when we have consumed all bytes
1007 * which should be sent on the crypto stream at a previous EL. For example,
1008 * the Handshake EL should not be provisioned until we have completely
1009 * consumed a TLS 1.3 ServerHello. Thus when we provision an EL the output
1010 * of ossl_quic_rstream_available() should be 0 for all lower ELs. Thus if a
1011 * given EL is available we simply ensure we have not received any further
1012 * bytes at a lower EL.
1013 */
1014 for (i = QUIC_ENC_LEVEL_INITIAL; i < ch->rx_enc_level; ++i)
1015 if (i != QUIC_ENC_LEVEL_0RTT &&
1016 !crypto_ensure_empty(ch->crypto_recv[ossl_quic_enc_level_to_pn_space(i)])) {
1017 /* Protocol violation (RFC 9001 s. 4.1.3) */
1018 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_PROTOCOL_VIOLATION,
1019 OSSL_QUIC_FRAME_TYPE_CRYPTO,
1020 "crypto stream data in wrong EL");
1021 return 0;
1022 }
1023
1024 rstream = ch->crypto_recv[ossl_quic_enc_level_to_pn_space(ch->rx_enc_level)];
1025 if (rstream == NULL)
1026 return 0;
1027
1028 return ossl_quic_rstream_get_record(rstream, buf, bytes_read,
1029 &is_fin);
1030 }
1031
ch_on_crypto_release_record(size_t bytes_read,void * arg)1032 static int ch_on_crypto_release_record(size_t bytes_read, void *arg)
1033 {
1034 QUIC_CHANNEL *ch = arg;
1035 QUIC_RSTREAM *rstream;
1036 OSSL_RTT_INFO rtt_info;
1037 uint32_t rx_pn_space = ossl_quic_enc_level_to_pn_space(ch->rx_enc_level);
1038
1039 rstream = ch->crypto_recv[rx_pn_space];
1040 if (rstream == NULL)
1041 return 0;
1042
1043 ossl_statm_get_rtt_info(ossl_quic_channel_get_statm(ch), &rtt_info);
1044 if (!ossl_quic_rxfc_on_retire(&ch->crypto_rxfc[rx_pn_space], bytes_read,
1045 rtt_info.smoothed_rtt))
1046 return 0;
1047
1048 return ossl_quic_rstream_release_record(rstream, bytes_read);
1049 }
1050
ch_on_handshake_yield_secret(uint32_t prot_level,int direction,uint32_t suite_id,EVP_MD * md,const unsigned char * secret,size_t secret_len,void * arg)1051 static int ch_on_handshake_yield_secret(uint32_t prot_level, int direction,
1052 uint32_t suite_id, EVP_MD *md,
1053 const unsigned char *secret,
1054 size_t secret_len,
1055 void *arg)
1056 {
1057 QUIC_CHANNEL *ch = arg;
1058 uint32_t i;
1059 uint32_t enc_level;
1060
1061 /* Convert TLS protection level to QUIC encryption level */
1062 switch (prot_level) {
1063 case OSSL_RECORD_PROTECTION_LEVEL_EARLY:
1064 enc_level = QUIC_ENC_LEVEL_0RTT;
1065 break;
1066
1067 case OSSL_RECORD_PROTECTION_LEVEL_HANDSHAKE:
1068 enc_level = QUIC_ENC_LEVEL_HANDSHAKE;
1069 break;
1070
1071 case OSSL_RECORD_PROTECTION_LEVEL_APPLICATION:
1072 enc_level = QUIC_ENC_LEVEL_1RTT;
1073 break;
1074
1075 default:
1076 return 0;
1077 }
1078
1079 if (enc_level < QUIC_ENC_LEVEL_HANDSHAKE || enc_level >= QUIC_ENC_LEVEL_NUM)
1080 /* Invalid EL. */
1081 return 0;
1082
1083
1084 if (direction) {
1085 /* TX */
1086 if (enc_level <= ch->tx_enc_level)
1087 /*
1088 * Does not make sense for us to try and provision an EL we have already
1089 * attained.
1090 */
1091 return 0;
1092
1093 if (!ossl_qtx_provide_secret(ch->qtx, enc_level,
1094 suite_id, md,
1095 secret, secret_len))
1096 return 0;
1097
1098 ch->tx_enc_level = enc_level;
1099 } else {
1100 /* RX */
1101 if (enc_level <= ch->rx_enc_level)
1102 /*
1103 * Does not make sense for us to try and provision an EL we have already
1104 * attained.
1105 */
1106 return 0;
1107
1108 /*
1109 * Ensure all crypto streams for previous ELs are now empty of available
1110 * data.
1111 */
1112 for (i = QUIC_ENC_LEVEL_INITIAL; i < enc_level; ++i)
1113 if (!crypto_ensure_empty(ch->crypto_recv[ossl_quic_enc_level_to_pn_space(i)])) {
1114 /* Protocol violation (RFC 9001 s. 4.1.3) */
1115 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_PROTOCOL_VIOLATION,
1116 OSSL_QUIC_FRAME_TYPE_CRYPTO,
1117 "crypto stream data in wrong EL");
1118 return 0;
1119 }
1120
1121 if (!ossl_qrx_provide_secret(ch->qrx, enc_level,
1122 suite_id, md,
1123 secret, secret_len))
1124 return 0;
1125
1126 ch->have_new_rx_secret = 1;
1127 ch->rx_enc_level = enc_level;
1128 }
1129
1130 return 1;
1131 }
1132
ch_on_handshake_complete(void * arg)1133 static int ch_on_handshake_complete(void *arg)
1134 {
1135 QUIC_CHANNEL *ch = arg;
1136
1137 if (!ossl_assert(!ch->handshake_complete))
1138 return 0; /* this should not happen twice */
1139
1140 if (!ossl_assert(ch->tx_enc_level == QUIC_ENC_LEVEL_1RTT))
1141 return 0;
1142
1143 /*
1144 * When handshake is complete, we no longer need to abide by the
1145 * 3x amplification limit, though we should be validated as soon
1146 * as we see a handshake key encrypted packet (see ossl_quic_handle_packet)
1147 */
1148 ossl_quic_tx_packetiser_set_validated(ch->txp);
1149
1150 if (!ch->got_remote_transport_params) {
1151 /*
1152 * Was not a valid QUIC handshake if we did not get valid transport
1153 * params.
1154 */
1155 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_CRYPTO_MISSING_EXT,
1156 OSSL_QUIC_FRAME_TYPE_CRYPTO,
1157 "no transport parameters received");
1158 return 0;
1159 }
1160
1161 /* Don't need transport parameters anymore. */
1162 OPENSSL_free(ch->local_transport_params);
1163 ch->local_transport_params = NULL;
1164
1165 /* Tell the QRX it can now process 1-RTT packets. */
1166 ossl_qrx_allow_1rtt_processing(ch->qrx);
1167
1168 /* Tell TXP the handshake is complete. */
1169 ossl_quic_tx_packetiser_notify_handshake_complete(ch->txp);
1170
1171 ch->handshake_complete = 1;
1172
1173 if (ch->pending_new_token != NULL) {
1174 /*
1175 * Note this is a best effort operation here
1176 * If scheduling a new token fails, the worst outcome is that
1177 * a client, not having received it, will just have to go through
1178 * an extra roundtrip on a subsequent connection via the retry frame
1179 * path, at which point we get another opportunity to schedule another
1180 * new token. As a result, we don't need to handle any errors here
1181 */
1182 ossl_quic_channel_schedule_new_token(ch,
1183 ch->pending_new_token,
1184 ch->pending_new_token_len);
1185 OPENSSL_free(ch->pending_new_token);
1186 ch->pending_new_token = NULL;
1187 ch->pending_new_token_len = 0;
1188 }
1189
1190 if (ch->is_server) {
1191 /*
1192 * On the server, the handshake is confirmed as soon as it is complete.
1193 */
1194 ossl_quic_channel_on_handshake_confirmed(ch);
1195
1196 ossl_quic_tx_packetiser_schedule_handshake_done(ch->txp);
1197 }
1198
1199 ch_record_state_transition(ch, ch->state);
1200 return 1;
1201 }
1202
ch_on_handshake_alert(void * arg,unsigned char alert_code)1203 static int ch_on_handshake_alert(void *arg, unsigned char alert_code)
1204 {
1205 QUIC_CHANNEL *ch = arg;
1206
1207 /*
1208 * RFC 9001 s. 4.4: More specifically, servers MUST NOT send post-handshake
1209 * TLS CertificateRequest messages, and clients MUST treat receipt of such
1210 * messages as a connection error of type PROTOCOL_VIOLATION.
1211 */
1212 if (alert_code == SSL_AD_UNEXPECTED_MESSAGE
1213 && ch->handshake_complete
1214 && ossl_quic_tls_is_cert_request(ch->qtls))
1215 ossl_quic_channel_raise_protocol_error(ch,
1216 OSSL_QUIC_ERR_PROTOCOL_VIOLATION,
1217 0,
1218 "Post-handshake TLS "
1219 "CertificateRequest received");
1220 /*
1221 * RFC 9001 s. 4.6.1: Servers MUST NOT send the early_data extension with a
1222 * max_early_data_size field set to any value other than 0xffffffff. A
1223 * client MUST treat receipt of a NewSessionTicket that contains an
1224 * early_data extension with any other value as a connection error of type
1225 * PROTOCOL_VIOLATION.
1226 */
1227 else if (alert_code == SSL_AD_ILLEGAL_PARAMETER
1228 && ch->handshake_complete
1229 && ossl_quic_tls_has_bad_max_early_data(ch->qtls))
1230 ossl_quic_channel_raise_protocol_error(ch,
1231 OSSL_QUIC_ERR_PROTOCOL_VIOLATION,
1232 0,
1233 "Bad max_early_data received");
1234 else
1235 ossl_quic_channel_raise_protocol_error(ch,
1236 OSSL_QUIC_ERR_CRYPTO_ERR_BEGIN
1237 + alert_code,
1238 0, "handshake alert");
1239
1240 return 1;
1241 }
1242
1243 /*
1244 * QUIC Channel: Transport Parameter Handling
1245 * ==========================================
1246 */
1247
1248 /*
1249 * Called by handshake layer when we receive QUIC Transport Parameters from the
1250 * peer. Note that these are not authenticated until the handshake is marked
1251 * as complete.
1252 */
1253 #define TP_REASON_SERVER_ONLY(x) \
1254 x " may not be sent by a client"
1255 #define TP_REASON_DUP(x) \
1256 x " appears multiple times"
1257 #define TP_REASON_MALFORMED(x) \
1258 x " is malformed"
1259 #define TP_REASON_EXPECTED_VALUE(x) \
1260 x " does not match expected value"
1261 #define TP_REASON_NOT_RETRY(x) \
1262 x " sent when not performing a retry"
1263 #define TP_REASON_REQUIRED(x) \
1264 x " was not sent but is required"
1265 #define TP_REASON_INTERNAL_ERROR(x) \
1266 x " encountered internal error"
1267
txfc_bump_cwm_bidi(QUIC_STREAM * s,void * arg)1268 static void txfc_bump_cwm_bidi(QUIC_STREAM *s, void *arg)
1269 {
1270 if (!ossl_quic_stream_is_bidi(s)
1271 || ossl_quic_stream_is_server_init(s))
1272 return;
1273
1274 ossl_quic_txfc_bump_cwm(&s->txfc, *(uint64_t *)arg);
1275 }
1276
txfc_bump_cwm_uni(QUIC_STREAM * s,void * arg)1277 static void txfc_bump_cwm_uni(QUIC_STREAM *s, void *arg)
1278 {
1279 if (ossl_quic_stream_is_bidi(s)
1280 || ossl_quic_stream_is_server_init(s))
1281 return;
1282
1283 ossl_quic_txfc_bump_cwm(&s->txfc, *(uint64_t *)arg);
1284 }
1285
do_update(QUIC_STREAM * s,void * arg)1286 static void do_update(QUIC_STREAM *s, void *arg)
1287 {
1288 QUIC_CHANNEL *ch = arg;
1289
1290 ossl_quic_stream_map_update_state(&ch->qsm, s);
1291 }
1292
min_u64_ignore_0(uint64_t a,uint64_t b)1293 static uint64_t min_u64_ignore_0(uint64_t a, uint64_t b)
1294 {
1295 if (a == 0)
1296 return b;
1297 if (b == 0)
1298 return a;
1299
1300 return a < b ? a : b;
1301 }
1302
ch_on_transport_params(const unsigned char * params,size_t params_len,void * arg)1303 static int ch_on_transport_params(const unsigned char *params,
1304 size_t params_len,
1305 void *arg)
1306 {
1307 QUIC_CHANNEL *ch = arg;
1308 PACKET pkt;
1309 uint64_t id, v;
1310 size_t len;
1311 const unsigned char *body;
1312 int got_orig_dcid = 0;
1313 int got_initial_scid = 0;
1314 int got_retry_scid = 0;
1315 int got_initial_max_data = 0;
1316 int got_initial_max_stream_data_bidi_local = 0;
1317 int got_initial_max_stream_data_bidi_remote = 0;
1318 int got_initial_max_stream_data_uni = 0;
1319 int got_initial_max_streams_bidi = 0;
1320 int got_initial_max_streams_uni = 0;
1321 int got_stateless_reset_token = 0;
1322 int got_preferred_addr = 0;
1323 int got_ack_delay_exp = 0;
1324 int got_max_ack_delay = 0;
1325 int got_max_udp_payload_size = 0;
1326 int got_max_idle_timeout = 0;
1327 int got_active_conn_id_limit = 0;
1328 int got_disable_active_migration = 0;
1329 QUIC_CONN_ID cid;
1330 const char *reason = "bad transport parameter";
1331 ossl_unused uint64_t rx_max_idle_timeout = 0;
1332 ossl_unused const void *stateless_reset_token_p = NULL;
1333 QUIC_PREFERRED_ADDR pfa;
1334 SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ch->tls);
1335
1336 /*
1337 * When HRR happens the client sends the transport params in the new client
1338 * hello again. Reset the transport params here and load them again.
1339 */
1340 if (ch->is_server && sc->hello_retry_request != SSL_HRR_NONE
1341 && ch->got_remote_transport_params) {
1342 ch->max_local_streams_bidi = 0;
1343 ch->max_local_streams_uni = 0;
1344 ch->got_local_transport_params = 0;
1345 OPENSSL_free(ch->local_transport_params);
1346 ch->local_transport_params = NULL;
1347 } else if (ch->got_remote_transport_params) {
1348 reason = "multiple transport parameter extensions";
1349 goto malformed;
1350 }
1351
1352 if (!PACKET_buf_init(&pkt, params, params_len)) {
1353 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_INTERNAL_ERROR, 0,
1354 "internal error (packet buf init)");
1355 return 0;
1356 }
1357
1358 while (PACKET_remaining(&pkt) > 0) {
1359 if (!ossl_quic_wire_peek_transport_param(&pkt, &id))
1360 goto malformed;
1361
1362 switch (id) {
1363 case QUIC_TPARAM_ORIG_DCID:
1364 if (got_orig_dcid) {
1365 reason = TP_REASON_DUP("ORIG_DCID");
1366 goto malformed;
1367 }
1368
1369 if (ch->is_server) {
1370 reason = TP_REASON_SERVER_ONLY("ORIG_DCID");
1371 goto malformed;
1372 }
1373
1374 if (!ossl_quic_wire_decode_transport_param_cid(&pkt, NULL, &cid)) {
1375 reason = TP_REASON_MALFORMED("ORIG_DCID");
1376 goto malformed;
1377 }
1378
1379 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
1380 /* Must match our initial DCID. */
1381 if (!ossl_quic_conn_id_eq(&ch->init_dcid, &cid)) {
1382 reason = TP_REASON_EXPECTED_VALUE("ORIG_DCID");
1383 goto malformed;
1384 }
1385 #endif
1386
1387 got_orig_dcid = 1;
1388 break;
1389
1390 case QUIC_TPARAM_RETRY_SCID:
1391 if (ch->is_server) {
1392 reason = TP_REASON_SERVER_ONLY("RETRY_SCID");
1393 goto malformed;
1394 }
1395
1396 if (got_retry_scid) {
1397 reason = TP_REASON_DUP("RETRY_SCID");
1398 goto malformed;
1399 }
1400
1401 if (!ch->doing_retry) {
1402 reason = TP_REASON_NOT_RETRY("RETRY_SCID");
1403 goto malformed;
1404 }
1405
1406 if (!ossl_quic_wire_decode_transport_param_cid(&pkt, NULL, &cid)) {
1407 reason = TP_REASON_MALFORMED("RETRY_SCID");
1408 goto malformed;
1409 }
1410
1411 /* Must match Retry packet SCID. */
1412 if (!ossl_quic_conn_id_eq(&ch->retry_scid, &cid)) {
1413 reason = TP_REASON_EXPECTED_VALUE("RETRY_SCID");
1414 goto malformed;
1415 }
1416
1417 got_retry_scid = 1;
1418 break;
1419
1420 case QUIC_TPARAM_INITIAL_SCID:
1421 if (got_initial_scid) {
1422 /* must not appear more than once */
1423 reason = TP_REASON_DUP("INITIAL_SCID");
1424 goto malformed;
1425 }
1426
1427 if (!ossl_quic_wire_decode_transport_param_cid(&pkt, NULL, &cid)) {
1428 reason = TP_REASON_MALFORMED("INITIAL_SCID");
1429 goto malformed;
1430 }
1431
1432 if (!ossl_quic_conn_id_eq(&ch->init_scid, &cid)) {
1433 reason = TP_REASON_EXPECTED_VALUE("INITIAL_SCID");
1434 goto malformed;
1435 }
1436
1437 got_initial_scid = 1;
1438 break;
1439
1440 case QUIC_TPARAM_INITIAL_MAX_DATA:
1441 if (got_initial_max_data) {
1442 /* must not appear more than once */
1443 reason = TP_REASON_DUP("INITIAL_MAX_DATA");
1444 goto malformed;
1445 }
1446
1447 if (!ossl_quic_wire_decode_transport_param_int(&pkt, &id, &v)) {
1448 reason = TP_REASON_MALFORMED("INITIAL_MAX_DATA");
1449 goto malformed;
1450 }
1451
1452 ossl_quic_txfc_bump_cwm(&ch->conn_txfc, v);
1453 got_initial_max_data = 1;
1454 break;
1455
1456 case QUIC_TPARAM_INITIAL_MAX_STREAM_DATA_BIDI_LOCAL:
1457 if (got_initial_max_stream_data_bidi_local) {
1458 /* must not appear more than once */
1459 reason = TP_REASON_DUP("INITIAL_MAX_STREAM_DATA_BIDI_LOCAL");
1460 goto malformed;
1461 }
1462
1463 if (!ossl_quic_wire_decode_transport_param_int(&pkt, &id, &v)) {
1464 reason = TP_REASON_MALFORMED("INITIAL_MAX_STREAM_DATA_BIDI_LOCAL");
1465 goto malformed;
1466 }
1467
1468 /*
1469 * This is correct; the BIDI_LOCAL TP governs streams created by
1470 * the endpoint which sends the TP, i.e., our peer.
1471 */
1472 ch->rx_init_max_stream_data_bidi_remote = v;
1473 got_initial_max_stream_data_bidi_local = 1;
1474 break;
1475
1476 case QUIC_TPARAM_INITIAL_MAX_STREAM_DATA_BIDI_REMOTE:
1477 if (got_initial_max_stream_data_bidi_remote) {
1478 /* must not appear more than once */
1479 reason = TP_REASON_DUP("INITIAL_MAX_STREAM_DATA_BIDI_REMOTE");
1480 goto malformed;
1481 }
1482
1483 if (!ossl_quic_wire_decode_transport_param_int(&pkt, &id, &v)) {
1484 reason = TP_REASON_MALFORMED("INITIAL_MAX_STREAM_DATA_BIDI_REMOTE");
1485 goto malformed;
1486 }
1487
1488 /*
1489 * This is correct; the BIDI_REMOTE TP governs streams created
1490 * by the endpoint which receives the TP, i.e., us.
1491 */
1492 ch->rx_init_max_stream_data_bidi_local = v;
1493
1494 /* Apply to all existing streams. */
1495 ossl_quic_stream_map_visit(&ch->qsm, txfc_bump_cwm_bidi, &v);
1496 got_initial_max_stream_data_bidi_remote = 1;
1497 break;
1498
1499 case QUIC_TPARAM_INITIAL_MAX_STREAM_DATA_UNI:
1500 if (got_initial_max_stream_data_uni) {
1501 /* must not appear more than once */
1502 reason = TP_REASON_DUP("INITIAL_MAX_STREAM_DATA_UNI");
1503 goto malformed;
1504 }
1505
1506 if (!ossl_quic_wire_decode_transport_param_int(&pkt, &id, &v)) {
1507 reason = TP_REASON_MALFORMED("INITIAL_MAX_STREAM_DATA_UNI");
1508 goto malformed;
1509 }
1510
1511 ch->rx_init_max_stream_data_uni = v;
1512
1513 /* Apply to all existing streams. */
1514 ossl_quic_stream_map_visit(&ch->qsm, txfc_bump_cwm_uni, &v);
1515 got_initial_max_stream_data_uni = 1;
1516 break;
1517
1518 case QUIC_TPARAM_ACK_DELAY_EXP:
1519 if (got_ack_delay_exp) {
1520 /* must not appear more than once */
1521 reason = TP_REASON_DUP("ACK_DELAY_EXP");
1522 goto malformed;
1523 }
1524
1525 if (!ossl_quic_wire_decode_transport_param_int(&pkt, &id, &v)
1526 || v > QUIC_MAX_ACK_DELAY_EXP) {
1527 reason = TP_REASON_MALFORMED("ACK_DELAY_EXP");
1528 goto malformed;
1529 }
1530
1531 ch->rx_ack_delay_exp = (unsigned char)v;
1532 got_ack_delay_exp = 1;
1533 break;
1534
1535 case QUIC_TPARAM_MAX_ACK_DELAY:
1536 if (got_max_ack_delay) {
1537 /* must not appear more than once */
1538 reason = TP_REASON_DUP("MAX_ACK_DELAY");
1539 goto malformed;
1540 }
1541
1542 if (!ossl_quic_wire_decode_transport_param_int(&pkt, &id, &v)
1543 || v >= (((uint64_t)1) << 14)) {
1544 reason = TP_REASON_MALFORMED("MAX_ACK_DELAY");
1545 goto malformed;
1546 }
1547
1548 ch->rx_max_ack_delay = v;
1549 ossl_ackm_set_rx_max_ack_delay(ch->ackm,
1550 ossl_ms2time(ch->rx_max_ack_delay));
1551
1552 got_max_ack_delay = 1;
1553 break;
1554
1555 case QUIC_TPARAM_INITIAL_MAX_STREAMS_BIDI:
1556 if (got_initial_max_streams_bidi) {
1557 /* must not appear more than once */
1558 reason = TP_REASON_DUP("INITIAL_MAX_STREAMS_BIDI");
1559 goto malformed;
1560 }
1561
1562 if (!ossl_quic_wire_decode_transport_param_int(&pkt, &id, &v)
1563 || v > (((uint64_t)1) << 60)) {
1564 reason = TP_REASON_MALFORMED("INITIAL_MAX_STREAMS_BIDI");
1565 goto malformed;
1566 }
1567
1568 assert(ch->max_local_streams_bidi == 0);
1569 ch->max_local_streams_bidi = v;
1570 got_initial_max_streams_bidi = 1;
1571 break;
1572
1573 case QUIC_TPARAM_INITIAL_MAX_STREAMS_UNI:
1574 if (got_initial_max_streams_uni) {
1575 /* must not appear more than once */
1576 reason = TP_REASON_DUP("INITIAL_MAX_STREAMS_UNI");
1577 goto malformed;
1578 }
1579
1580 if (!ossl_quic_wire_decode_transport_param_int(&pkt, &id, &v)
1581 || v > (((uint64_t)1) << 60)) {
1582 reason = TP_REASON_MALFORMED("INITIAL_MAX_STREAMS_UNI");
1583 goto malformed;
1584 }
1585
1586 assert(ch->max_local_streams_uni == 0);
1587 ch->max_local_streams_uni = v;
1588 got_initial_max_streams_uni = 1;
1589 break;
1590
1591 case QUIC_TPARAM_MAX_IDLE_TIMEOUT:
1592 if (got_max_idle_timeout) {
1593 /* must not appear more than once */
1594 reason = TP_REASON_DUP("MAX_IDLE_TIMEOUT");
1595 goto malformed;
1596 }
1597
1598 if (!ossl_quic_wire_decode_transport_param_int(&pkt, &id, &v)) {
1599 reason = TP_REASON_MALFORMED("MAX_IDLE_TIMEOUT");
1600 goto malformed;
1601 }
1602
1603 ch->max_idle_timeout_remote_req = v;
1604
1605 ch->max_idle_timeout = min_u64_ignore_0(ch->max_idle_timeout_local_req,
1606 ch->max_idle_timeout_remote_req);
1607
1608
1609 ch_update_idle(ch);
1610 got_max_idle_timeout = 1;
1611 rx_max_idle_timeout = v;
1612 break;
1613
1614 case QUIC_TPARAM_MAX_UDP_PAYLOAD_SIZE:
1615 if (got_max_udp_payload_size) {
1616 /* must not appear more than once */
1617 reason = TP_REASON_DUP("MAX_UDP_PAYLOAD_SIZE");
1618 goto malformed;
1619 }
1620
1621 if (!ossl_quic_wire_decode_transport_param_int(&pkt, &id, &v)
1622 || v < QUIC_MIN_INITIAL_DGRAM_LEN) {
1623 reason = TP_REASON_MALFORMED("MAX_UDP_PAYLOAD_SIZE");
1624 goto malformed;
1625 }
1626
1627 ch->rx_max_udp_payload_size = v;
1628 got_max_udp_payload_size = 1;
1629 break;
1630
1631 case QUIC_TPARAM_ACTIVE_CONN_ID_LIMIT:
1632 if (got_active_conn_id_limit) {
1633 /* must not appear more than once */
1634 reason = TP_REASON_DUP("ACTIVE_CONN_ID_LIMIT");
1635 goto malformed;
1636 }
1637
1638 if (!ossl_quic_wire_decode_transport_param_int(&pkt, &id, &v)
1639 || v < QUIC_MIN_ACTIVE_CONN_ID_LIMIT) {
1640 reason = TP_REASON_MALFORMED("ACTIVE_CONN_ID_LIMIT");
1641 goto malformed;
1642 }
1643
1644 ch->rx_active_conn_id_limit = v;
1645 got_active_conn_id_limit = 1;
1646 break;
1647
1648 case QUIC_TPARAM_STATELESS_RESET_TOKEN:
1649 if (got_stateless_reset_token) {
1650 reason = TP_REASON_DUP("STATELESS_RESET_TOKEN");
1651 goto malformed;
1652 }
1653
1654 /*
1655 * RFC 9000 s. 18.2: This transport parameter MUST NOT be sent
1656 * by a client but MAY be sent by a server.
1657 */
1658 if (ch->is_server) {
1659 reason = TP_REASON_SERVER_ONLY("STATELESS_RESET_TOKEN");
1660 goto malformed;
1661 }
1662
1663 body = ossl_quic_wire_decode_transport_param_bytes(&pkt, &id, &len);
1664 if (body == NULL || len != QUIC_STATELESS_RESET_TOKEN_LEN) {
1665 reason = TP_REASON_MALFORMED("STATELESS_RESET_TOKEN");
1666 goto malformed;
1667 }
1668 if (!ossl_quic_srtm_add(ch->srtm, ch, ch->cur_remote_seq_num,
1669 (const QUIC_STATELESS_RESET_TOKEN *)body)) {
1670 reason = TP_REASON_INTERNAL_ERROR("STATELESS_RESET_TOKEN");
1671 goto malformed;
1672 }
1673
1674 stateless_reset_token_p = body;
1675 got_stateless_reset_token = 1;
1676 break;
1677
1678 case QUIC_TPARAM_PREFERRED_ADDR:
1679 /* TODO(QUIC FUTURE): Handle preferred address. */
1680 if (got_preferred_addr) {
1681 reason = TP_REASON_DUP("PREFERRED_ADDR");
1682 goto malformed;
1683 }
1684
1685 /*
1686 * RFC 9000 s. 18.2: "A server that chooses a zero-length
1687 * connection ID MUST NOT provide a preferred address.
1688 * Similarly, a server MUST NOT include a zero-length connection
1689 * ID in this transport parameter. A client MUST treat a
1690 * violation of these requirements as a connection error of type
1691 * TRANSPORT_PARAMETER_ERROR."
1692 */
1693 if (ch->is_server) {
1694 reason = TP_REASON_SERVER_ONLY("PREFERRED_ADDR");
1695 goto malformed;
1696 }
1697
1698 if (ch->cur_remote_dcid.id_len == 0) {
1699 reason = "PREFERRED_ADDR provided for zero-length CID";
1700 goto malformed;
1701 }
1702
1703 if (!ossl_quic_wire_decode_transport_param_preferred_addr(&pkt, &pfa)) {
1704 reason = TP_REASON_MALFORMED("PREFERRED_ADDR");
1705 goto malformed;
1706 }
1707
1708 if (pfa.cid.id_len == 0) {
1709 reason = "zero-length CID in PREFERRED_ADDR";
1710 goto malformed;
1711 }
1712
1713 got_preferred_addr = 1;
1714 break;
1715
1716 case QUIC_TPARAM_DISABLE_ACTIVE_MIGRATION:
1717 /* We do not currently handle migration, so nothing to do. */
1718 if (got_disable_active_migration) {
1719 /* must not appear more than once */
1720 reason = TP_REASON_DUP("DISABLE_ACTIVE_MIGRATION");
1721 goto malformed;
1722 }
1723
1724 body = ossl_quic_wire_decode_transport_param_bytes(&pkt, &id, &len);
1725 if (body == NULL || len > 0) {
1726 reason = TP_REASON_MALFORMED("DISABLE_ACTIVE_MIGRATION");
1727 goto malformed;
1728 }
1729
1730 got_disable_active_migration = 1;
1731 break;
1732
1733 default:
1734 /*
1735 * Skip over and ignore.
1736 *
1737 * RFC 9000 s. 7.4: We SHOULD treat duplicated transport parameters
1738 * as a connection error, but we are not required to. Currently,
1739 * handle this programmatically by checking for duplicates in the
1740 * parameters that we recognise, as above, but don't bother
1741 * maintaining a list of duplicates for anything we don't recognise.
1742 */
1743 body = ossl_quic_wire_decode_transport_param_bytes(&pkt, &id,
1744 &len);
1745 if (body == NULL)
1746 goto malformed;
1747
1748 break;
1749 }
1750 }
1751
1752 if (!got_initial_scid) {
1753 reason = TP_REASON_REQUIRED("INITIAL_SCID");
1754 goto malformed;
1755 }
1756
1757 if (!ch->is_server) {
1758 if (!got_orig_dcid) {
1759 reason = TP_REASON_REQUIRED("ORIG_DCID");
1760 goto malformed;
1761 }
1762
1763 if (ch->doing_retry && !got_retry_scid) {
1764 reason = TP_REASON_REQUIRED("RETRY_SCID");
1765 goto malformed;
1766 }
1767 }
1768
1769 ch->got_remote_transport_params = 1;
1770
1771 #ifndef OPENSSL_NO_QLOG
1772 QLOG_EVENT_BEGIN(ch_get_qlog(ch), transport, parameters_set)
1773 QLOG_STR("owner", "remote");
1774
1775 if (got_orig_dcid)
1776 QLOG_CID("original_destination_connection_id",
1777 &ch->init_dcid);
1778 if (got_initial_scid)
1779 QLOG_CID("original_source_connection_id",
1780 &ch->init_dcid);
1781 if (got_retry_scid)
1782 QLOG_CID("retry_source_connection_id",
1783 &ch->retry_scid);
1784 if (got_initial_max_data)
1785 QLOG_U64("initial_max_data",
1786 ossl_quic_txfc_get_cwm(&ch->conn_txfc));
1787 if (got_initial_max_stream_data_bidi_local)
1788 QLOG_U64("initial_max_stream_data_bidi_local",
1789 ch->rx_init_max_stream_data_bidi_local);
1790 if (got_initial_max_stream_data_bidi_remote)
1791 QLOG_U64("initial_max_stream_data_bidi_remote",
1792 ch->rx_init_max_stream_data_bidi_remote);
1793 if (got_initial_max_stream_data_uni)
1794 QLOG_U64("initial_max_stream_data_uni",
1795 ch->rx_init_max_stream_data_uni);
1796 if (got_initial_max_streams_bidi)
1797 QLOG_U64("initial_max_streams_bidi",
1798 ch->max_local_streams_bidi);
1799 if (got_initial_max_streams_uni)
1800 QLOG_U64("initial_max_streams_uni",
1801 ch->max_local_streams_uni);
1802 if (got_ack_delay_exp)
1803 QLOG_U64("ack_delay_exponent", ch->rx_ack_delay_exp);
1804 if (got_max_ack_delay)
1805 QLOG_U64("max_ack_delay", ch->rx_max_ack_delay);
1806 if (got_max_udp_payload_size)
1807 QLOG_U64("max_udp_payload_size", ch->rx_max_udp_payload_size);
1808 if (got_max_idle_timeout)
1809 QLOG_U64("max_idle_timeout", rx_max_idle_timeout);
1810 if (got_active_conn_id_limit)
1811 QLOG_U64("active_connection_id_limit", ch->rx_active_conn_id_limit);
1812 if (got_stateless_reset_token)
1813 QLOG_BIN("stateless_reset_token", stateless_reset_token_p,
1814 QUIC_STATELESS_RESET_TOKEN_LEN);
1815 if (got_preferred_addr) {
1816 QLOG_BEGIN("preferred_addr")
1817 QLOG_U64("port_v4", pfa.ipv4_port);
1818 QLOG_U64("port_v6", pfa.ipv6_port);
1819 QLOG_BIN("ip_v4", pfa.ipv4, sizeof(pfa.ipv4));
1820 QLOG_BIN("ip_v6", pfa.ipv6, sizeof(pfa.ipv6));
1821 QLOG_BIN("stateless_reset_token", pfa.stateless_reset.token,
1822 sizeof(pfa.stateless_reset.token));
1823 QLOG_CID("connection_id", &pfa.cid);
1824 QLOG_END()
1825 }
1826 QLOG_BOOL("disable_active_migration", got_disable_active_migration);
1827 QLOG_EVENT_END()
1828 #endif
1829
1830 if (got_initial_max_data || got_initial_max_stream_data_bidi_remote
1831 || got_initial_max_streams_bidi || got_initial_max_streams_uni)
1832 /*
1833 * If FC credit was bumped, we may now be able to send. Update all
1834 * streams.
1835 */
1836 ossl_quic_stream_map_visit(&ch->qsm, do_update, ch);
1837
1838 /* If we are a server, we now generate our own transport parameters. */
1839 if (ch->is_server && !ch_generate_transport_params(ch)) {
1840 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_INTERNAL_ERROR, 0,
1841 "internal error");
1842 return 0;
1843 }
1844
1845 return 1;
1846
1847 malformed:
1848 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_TRANSPORT_PARAMETER_ERROR,
1849 0, reason);
1850 return 0;
1851 }
1852
1853 /*
1854 * Called when we want to generate transport parameters. This is called
1855 * immediately at instantiation time for a client and after we receive the
1856 * client's transport parameters for a server.
1857 */
ch_generate_transport_params(QUIC_CHANNEL * ch)1858 static int ch_generate_transport_params(QUIC_CHANNEL *ch)
1859 {
1860 int ok = 0;
1861 BUF_MEM *buf_mem = NULL;
1862 WPACKET wpkt;
1863 int wpkt_valid = 0;
1864 size_t buf_len = 0;
1865 QUIC_CONN_ID *id_to_use = NULL;
1866
1867 /*
1868 * We need to select which connection id to encode in the
1869 * QUIC_TPARAM_ORIG_DCID transport parameter
1870 * If we have an odcid, then this connection was established
1871 * in response to a retry request, and we need to use the connection
1872 * id sent in the first initial packet.
1873 * If we don't have an odcid, then this connection was established
1874 * without a retry and the init_dcid is the connection we should use
1875 */
1876 if (ch->odcid.id_len == 0)
1877 id_to_use = &ch->init_dcid;
1878 else
1879 id_to_use = &ch->odcid;
1880
1881 if (ch->local_transport_params != NULL || ch->got_local_transport_params)
1882 goto err;
1883
1884 if ((buf_mem = BUF_MEM_new()) == NULL)
1885 goto err;
1886
1887 if (!WPACKET_init(&wpkt, buf_mem))
1888 goto err;
1889
1890 wpkt_valid = 1;
1891
1892 if (ossl_quic_wire_encode_transport_param_bytes(&wpkt, QUIC_TPARAM_DISABLE_ACTIVE_MIGRATION,
1893 NULL, 0) == NULL)
1894 goto err;
1895
1896 if (ch->is_server) {
1897 if (!ossl_quic_wire_encode_transport_param_cid(&wpkt, QUIC_TPARAM_ORIG_DCID,
1898 id_to_use))
1899 goto err;
1900
1901 if (!ossl_quic_wire_encode_transport_param_cid(&wpkt, QUIC_TPARAM_INITIAL_SCID,
1902 &ch->cur_local_cid))
1903 goto err;
1904 if (ch->odcid.id_len != 0)
1905 if (!ossl_quic_wire_encode_transport_param_cid(&wpkt,
1906 QUIC_TPARAM_RETRY_SCID,
1907 &ch->init_dcid))
1908 goto err;
1909 } else {
1910 if (!ossl_quic_wire_encode_transport_param_cid(&wpkt, QUIC_TPARAM_INITIAL_SCID,
1911 &ch->init_scid))
1912 goto err;
1913 }
1914
1915 if (!ossl_quic_wire_encode_transport_param_int(&wpkt, QUIC_TPARAM_MAX_IDLE_TIMEOUT,
1916 ch->max_idle_timeout_local_req))
1917 goto err;
1918
1919 if (!ossl_quic_wire_encode_transport_param_int(&wpkt, QUIC_TPARAM_MAX_UDP_PAYLOAD_SIZE,
1920 QUIC_MIN_INITIAL_DGRAM_LEN))
1921 goto err;
1922
1923 if (!ossl_quic_wire_encode_transport_param_int(&wpkt, QUIC_TPARAM_ACTIVE_CONN_ID_LIMIT,
1924 QUIC_MIN_ACTIVE_CONN_ID_LIMIT))
1925 goto err;
1926
1927 if (ch->tx_max_ack_delay != QUIC_DEFAULT_MAX_ACK_DELAY
1928 && !ossl_quic_wire_encode_transport_param_int(&wpkt, QUIC_TPARAM_MAX_ACK_DELAY,
1929 ch->tx_max_ack_delay))
1930 goto err;
1931
1932 if (!ossl_quic_wire_encode_transport_param_int(&wpkt, QUIC_TPARAM_INITIAL_MAX_DATA,
1933 ossl_quic_rxfc_get_cwm(&ch->conn_rxfc)))
1934 goto err;
1935
1936 /* Send the default CWM for a new RXFC. */
1937 if (!ossl_quic_wire_encode_transport_param_int(&wpkt, QUIC_TPARAM_INITIAL_MAX_STREAM_DATA_BIDI_LOCAL,
1938 ch->tx_init_max_stream_data_bidi_local))
1939 goto err;
1940
1941 if (!ossl_quic_wire_encode_transport_param_int(&wpkt, QUIC_TPARAM_INITIAL_MAX_STREAM_DATA_BIDI_REMOTE,
1942 ch->tx_init_max_stream_data_bidi_remote))
1943 goto err;
1944
1945 if (!ossl_quic_wire_encode_transport_param_int(&wpkt, QUIC_TPARAM_INITIAL_MAX_STREAM_DATA_UNI,
1946 ch->tx_init_max_stream_data_uni))
1947 goto err;
1948
1949 if (!ossl_quic_wire_encode_transport_param_int(&wpkt, QUIC_TPARAM_INITIAL_MAX_STREAMS_BIDI,
1950 ossl_quic_rxfc_get_cwm(&ch->max_streams_bidi_rxfc)))
1951 goto err;
1952
1953 if (!ossl_quic_wire_encode_transport_param_int(&wpkt, QUIC_TPARAM_INITIAL_MAX_STREAMS_UNI,
1954 ossl_quic_rxfc_get_cwm(&ch->max_streams_uni_rxfc)))
1955 goto err;
1956
1957 if (!WPACKET_finish(&wpkt))
1958 goto err;
1959
1960 wpkt_valid = 0;
1961
1962 if (!WPACKET_get_total_written(&wpkt, &buf_len))
1963 goto err;
1964
1965 ch->local_transport_params = (unsigned char *)buf_mem->data;
1966 buf_mem->data = NULL;
1967
1968 if (!ossl_quic_tls_set_transport_params(ch->qtls, ch->local_transport_params,
1969 buf_len))
1970 goto err;
1971
1972 #ifndef OPENSSL_NO_QLOG
1973 QLOG_EVENT_BEGIN(ch_get_qlog(ch), transport, parameters_set)
1974 QLOG_STR("owner", "local");
1975 QLOG_BOOL("disable_active_migration", 1);
1976 if (ch->is_server) {
1977 QLOG_CID("original_destination_connection_id", &ch->init_dcid);
1978 QLOG_CID("initial_source_connection_id", &ch->cur_local_cid);
1979 } else {
1980 QLOG_STR("initial_source_connection_id", "");
1981 }
1982 QLOG_U64("max_idle_timeout", ch->max_idle_timeout);
1983 QLOG_U64("max_udp_payload_size", QUIC_MIN_INITIAL_DGRAM_LEN);
1984 QLOG_U64("active_connection_id_limit", QUIC_MIN_ACTIVE_CONN_ID_LIMIT);
1985 QLOG_U64("max_ack_delay", ch->tx_max_ack_delay);
1986 QLOG_U64("initial_max_data", ossl_quic_rxfc_get_cwm(&ch->conn_rxfc));
1987 QLOG_U64("initial_max_stream_data_bidi_local",
1988 ch->tx_init_max_stream_data_bidi_local);
1989 QLOG_U64("initial_max_stream_data_bidi_remote",
1990 ch->tx_init_max_stream_data_bidi_remote);
1991 QLOG_U64("initial_max_stream_data_uni",
1992 ch->tx_init_max_stream_data_uni);
1993 QLOG_U64("initial_max_streams_bidi",
1994 ossl_quic_rxfc_get_cwm(&ch->max_streams_bidi_rxfc));
1995 QLOG_U64("initial_max_streams_uni",
1996 ossl_quic_rxfc_get_cwm(&ch->max_streams_uni_rxfc));
1997 QLOG_EVENT_END()
1998 #endif
1999
2000 ch->got_local_transport_params = 1;
2001
2002 ok = 1;
2003 err:
2004 if (wpkt_valid)
2005 WPACKET_cleanup(&wpkt);
2006 BUF_MEM_free(buf_mem);
2007 return ok;
2008 }
2009
2010 /*
2011 * QUIC Channel: Ticker-Mutator
2012 * ============================
2013 */
2014
2015 /*
2016 * The central ticker function called by the reactor. This does everything, or
2017 * at least everything network I/O related. Best effort - not allowed to fail
2018 * "loudly".
2019 */
ossl_quic_channel_subtick(QUIC_CHANNEL * ch,QUIC_TICK_RESULT * res,uint32_t flags)2020 void ossl_quic_channel_subtick(QUIC_CHANNEL *ch, QUIC_TICK_RESULT *res,
2021 uint32_t flags)
2022 {
2023 OSSL_TIME now, deadline;
2024 int channel_only = (flags & QUIC_REACTOR_TICK_FLAG_CHANNEL_ONLY) != 0;
2025 int notify_other_threads = 0;
2026
2027 /*
2028 * When we tick the QUIC connection, we do everything we need to do
2029 * periodically. Network I/O handling will already have been performed
2030 * as necessary by the QUIC port. Thus, in order, we:
2031 *
2032 * - handle any packets the DEMUX has queued up for us;
2033 * - handle any timer events which are due to fire (ACKM, etc.);
2034 * - generate any packets which need to be sent;
2035 * - determine the time at which we should next be ticked.
2036 */
2037
2038 /*
2039 * If the connection has not yet started, or we are in the TERMINATED state,
2040 * there is nothing to do.
2041 */
2042 if (ch->state == QUIC_CHANNEL_STATE_IDLE
2043 || ossl_quic_channel_is_terminated(ch)) {
2044 res->net_read_desired = 0;
2045 res->net_write_desired = 0;
2046 res->notify_other_threads = 0;
2047 res->tick_deadline = ossl_time_infinite();
2048 return;
2049 }
2050
2051 /*
2052 * If we are in the TERMINATING state, check if the terminating timer has
2053 * expired.
2054 */
2055 if (ossl_quic_channel_is_terminating(ch)) {
2056 now = get_time(ch);
2057
2058 if (ossl_time_compare(now, ch->terminate_deadline) >= 0) {
2059 ch_on_terminating_timeout(ch);
2060 res->net_read_desired = 0;
2061 res->net_write_desired = 0;
2062 res->notify_other_threads = 1;
2063 res->tick_deadline = ossl_time_infinite();
2064 return; /* abort normal processing, nothing to do */
2065 }
2066 }
2067
2068 if (!ch->port->engine->inhibit_tick) {
2069 /* Handle RXKU timeouts. */
2070 ch_rxku_tick(ch);
2071
2072 do {
2073 /* Process queued incoming packets. */
2074 ch->did_tls_tick = 0;
2075 ch->have_new_rx_secret = 0;
2076 ch_rx(ch, channel_only, ¬ify_other_threads);
2077
2078 /*
2079 * Allow the handshake layer to check for any new incoming data and
2080 * generate new outgoing data.
2081 */
2082 if (!ch->did_tls_tick)
2083 ch_tick_tls(ch, channel_only, ¬ify_other_threads);
2084
2085 /*
2086 * If the handshake layer gave us a new secret, we need to do RX
2087 * again because packets that were not previously processable and
2088 * were deferred might now be processable.
2089 *
2090 * TODO(QUIC FUTURE): Consider handling this in the yield_secret callback.
2091 */
2092 } while (ch->have_new_rx_secret);
2093 }
2094
2095 /*
2096 * Handle any timer events which are due to fire; namely, the loss
2097 * detection deadline and the idle timeout.
2098 *
2099 * ACKM ACK generation deadline is polled by TXP, so we don't need to
2100 * handle it here.
2101 */
2102 now = get_time(ch);
2103 if (ossl_time_compare(now, ch->idle_deadline) >= 0) {
2104 /*
2105 * Idle timeout differs from normal protocol violation because we do
2106 * not send a CONN_CLOSE frame; go straight to TERMINATED.
2107 */
2108 if (!ch->port->engine->inhibit_tick)
2109 ch_on_idle_timeout(ch);
2110
2111 res->net_read_desired = 0;
2112 res->net_write_desired = 0;
2113 res->notify_other_threads = 1;
2114 res->tick_deadline = ossl_time_infinite();
2115 return;
2116 }
2117
2118 if (!ch->port->engine->inhibit_tick) {
2119 deadline = ossl_ackm_get_loss_detection_deadline(ch->ackm);
2120 if (!ossl_time_is_zero(deadline)
2121 && ossl_time_compare(now, deadline) >= 0)
2122 ossl_ackm_on_timeout(ch->ackm);
2123
2124 /* If a ping is due, inform TXP. */
2125 if (ossl_time_compare(now, ch->ping_deadline) >= 0) {
2126 int pn_space = ossl_quic_enc_level_to_pn_space(ch->tx_enc_level);
2127
2128 ossl_quic_tx_packetiser_schedule_ack_eliciting(ch->txp, pn_space);
2129
2130 /*
2131 * If we have no CC budget at this time we cannot process the above
2132 * PING request immediately. In any case we have scheduled the
2133 * request so bump the ping deadline. If we don't do this we will
2134 * busy-loop endlessly as the above deadline comparison condition
2135 * will still be met.
2136 */
2137 ch_update_ping_deadline(ch);
2138 }
2139
2140 /* Queue any data to be sent for transmission. */
2141 ch_tx(ch, ¬ify_other_threads);
2142
2143 /* Do stream GC. */
2144 ossl_quic_stream_map_gc(&ch->qsm);
2145 }
2146
2147 /* Determine the time at which we should next be ticked. */
2148 res->tick_deadline = ch_determine_next_tick_deadline(ch);
2149
2150 /*
2151 * Always process network input unless we are now terminated. Although we
2152 * had not terminated at the beginning of this tick, network errors in
2153 * ch_tx() may have caused us to transition to the Terminated state.
2154 */
2155 res->net_read_desired = !ossl_quic_channel_is_terminated(ch);
2156
2157 /* We want to write to the network if we have any data in our TX queue. */
2158 res->net_write_desired
2159 = (!ossl_quic_channel_is_terminated(ch)
2160 && ossl_qtx_get_queue_len_datagrams(ch->qtx) > 0);
2161
2162 res->notify_other_threads = notify_other_threads;
2163 }
2164
ch_tick_tls(QUIC_CHANNEL * ch,int channel_only,int * notify_other_threads)2165 static int ch_tick_tls(QUIC_CHANNEL *ch, int channel_only, int *notify_other_threads)
2166 {
2167 uint64_t error_code;
2168 const char *error_msg;
2169 ERR_STATE *error_state = NULL;
2170
2171 if (channel_only)
2172 return 1;
2173
2174 ch->did_tls_tick = 1;
2175 ossl_quic_tls_tick(ch->qtls);
2176
2177 if (ossl_quic_tls_get_error(ch->qtls, &error_code, &error_msg,
2178 &error_state)) {
2179 ossl_quic_channel_raise_protocol_error_state(ch, error_code, 0,
2180 error_msg, error_state);
2181 if (notify_other_threads != NULL)
2182 *notify_other_threads = 1;
2183
2184 return 0;
2185 }
2186
2187 return 1;
2188 }
2189
2190 /* Check incoming forged packet limit and terminate connection if needed. */
ch_rx_check_forged_pkt_limit(QUIC_CHANNEL * ch)2191 static void ch_rx_check_forged_pkt_limit(QUIC_CHANNEL *ch)
2192 {
2193 uint32_t enc_level;
2194 uint64_t limit = UINT64_MAX, l;
2195
2196 for (enc_level = QUIC_ENC_LEVEL_INITIAL;
2197 enc_level < QUIC_ENC_LEVEL_NUM;
2198 ++enc_level)
2199 {
2200 /*
2201 * Different ELs can have different AEADs which can in turn impose
2202 * different limits, so use the lowest value of any currently valid EL.
2203 */
2204 if ((ch->el_discarded & (1U << enc_level)) != 0)
2205 continue;
2206
2207 if (enc_level > ch->rx_enc_level)
2208 break;
2209
2210 l = ossl_qrx_get_max_forged_pkt_count(ch->qrx, enc_level);
2211 if (l < limit)
2212 limit = l;
2213 }
2214
2215 if (ossl_qrx_get_cur_forged_pkt_count(ch->qrx) < limit)
2216 return;
2217
2218 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_AEAD_LIMIT_REACHED, 0,
2219 "forgery limit");
2220 }
2221
2222 /* Process queued incoming packets and handle frames, if any. */
ch_rx(QUIC_CHANNEL * ch,int channel_only,int * notify_other_threads)2223 static int ch_rx(QUIC_CHANNEL *ch, int channel_only, int *notify_other_threads)
2224 {
2225 int handled_any = 0;
2226 const int closing = ossl_quic_channel_is_closing(ch);
2227
2228 if (!ch->is_server && !ch->have_sent_any_pkt)
2229 /*
2230 * We have not sent anything yet, therefore there is no need to check
2231 * for incoming data.
2232 */
2233 return 1;
2234
2235 for (;;) {
2236 assert(ch->qrx_pkt == NULL);
2237
2238 if (!ossl_qrx_read_pkt(ch->qrx, &ch->qrx_pkt))
2239 break;
2240
2241 /* Track the amount of data received while in the closing state */
2242 if (closing)
2243 ossl_quic_tx_packetiser_record_received_closing_bytes(
2244 ch->txp, ch->qrx_pkt->hdr->len);
2245
2246 if (!handled_any) {
2247 ch_update_idle(ch);
2248 ch_update_ping_deadline(ch);
2249 }
2250
2251 ch_rx_handle_packet(ch, channel_only); /* best effort */
2252
2253 /*
2254 * Regardless of the outcome of frame handling, unref the packet.
2255 * This will free the packet unless something added another
2256 * reference to it during frame processing.
2257 */
2258 ossl_qrx_pkt_release(ch->qrx_pkt);
2259 ch->qrx_pkt = NULL;
2260
2261 ch->have_sent_ack_eliciting_since_rx = 0;
2262 handled_any = 1;
2263 }
2264
2265 ch_rx_check_forged_pkt_limit(ch);
2266
2267 if (handled_any && notify_other_threads != NULL)
2268 *notify_other_threads = 1;
2269
2270 /*
2271 * When in TERMINATING - CLOSING, generate a CONN_CLOSE frame whenever we
2272 * process one or more incoming packets.
2273 */
2274 if (handled_any && closing)
2275 ch->conn_close_queued = 1;
2276
2277 return 1;
2278 }
2279
bio_addr_eq(const BIO_ADDR * a,const BIO_ADDR * b)2280 static int bio_addr_eq(const BIO_ADDR *a, const BIO_ADDR *b)
2281 {
2282 if (BIO_ADDR_family(a) != BIO_ADDR_family(b))
2283 return 0;
2284
2285 switch (BIO_ADDR_family(a)) {
2286 case AF_INET:
2287 return !memcmp(&a->s_in.sin_addr,
2288 &b->s_in.sin_addr,
2289 sizeof(a->s_in.sin_addr))
2290 && a->s_in.sin_port == b->s_in.sin_port;
2291 #if OPENSSL_USE_IPV6
2292 case AF_INET6:
2293 return !memcmp(&a->s_in6.sin6_addr,
2294 &b->s_in6.sin6_addr,
2295 sizeof(a->s_in6.sin6_addr))
2296 && a->s_in6.sin6_port == b->s_in6.sin6_port;
2297 #endif
2298 default:
2299 return 0; /* not supported */
2300 }
2301
2302 return 1;
2303 }
2304
2305 /* Handles the packet currently in ch->qrx_pkt->hdr. */
ch_rx_handle_packet(QUIC_CHANNEL * ch,int channel_only)2306 static void ch_rx_handle_packet(QUIC_CHANNEL *ch, int channel_only)
2307 {
2308 uint32_t enc_level;
2309 int old_have_processed_any_pkt = ch->have_processed_any_pkt;
2310 OSSL_QTX_IOVEC iovec;
2311 PACKET vpkt;
2312 unsigned long supported_ver;
2313
2314 assert(ch->qrx_pkt != NULL);
2315
2316 /*
2317 * RFC 9000 s. 10.2.1 Closing Connection State:
2318 * An endpoint that is closing is not required to process any
2319 * received frame.
2320 */
2321 if (!ossl_quic_channel_is_active(ch))
2322 return;
2323
2324 if (ossl_quic_pkt_type_is_encrypted(ch->qrx_pkt->hdr->type)) {
2325 if (!ch->have_received_enc_pkt) {
2326 ch->cur_remote_dcid = ch->init_scid = ch->qrx_pkt->hdr->src_conn_id;
2327 ch->have_received_enc_pkt = 1;
2328
2329 /*
2330 * We change to using the SCID in the first Initial packet as the
2331 * DCID.
2332 */
2333 ossl_quic_tx_packetiser_set_cur_dcid(ch->txp, &ch->init_scid);
2334 }
2335
2336 enc_level = ossl_quic_pkt_type_to_enc_level(ch->qrx_pkt->hdr->type);
2337 if ((ch->el_discarded & (1U << enc_level)) != 0)
2338 /* Do not process packets from ELs we have already discarded. */
2339 return;
2340 }
2341
2342 /*
2343 * RFC 9000 s. 9.6: "If a client receives packets from a new server address
2344 * when the client has not initiated a migration to that address, the client
2345 * SHOULD discard these packets."
2346 *
2347 * We need to be a bit careful here as due to the BIO abstraction layer an
2348 * application is liable to be weird and lie to us about peer addresses.
2349 * Only apply this check if we actually are using a real AF_INET or AF_INET6
2350 * address.
2351 */
2352 if (!ch->is_server
2353 && ch->qrx_pkt->peer != NULL
2354 && (
2355 BIO_ADDR_family(&ch->cur_peer_addr) == AF_INET
2356 #if OPENSSL_USE_IPV6
2357 || BIO_ADDR_family(&ch->cur_peer_addr) == AF_INET6
2358 #endif
2359 )
2360 && !bio_addr_eq(ch->qrx_pkt->peer, &ch->cur_peer_addr))
2361 return;
2362
2363 if (!ch->is_server
2364 && ch->have_received_enc_pkt
2365 && ossl_quic_pkt_type_has_scid(ch->qrx_pkt->hdr->type)) {
2366 /*
2367 * RFC 9000 s. 7.2: "Once a client has received a valid Initial packet
2368 * from the server, it MUST discard any subsequent packet it receives on
2369 * that connection with a different SCID."
2370 */
2371 if (!ossl_quic_conn_id_eq(&ch->qrx_pkt->hdr->src_conn_id,
2372 &ch->init_scid))
2373 return;
2374 }
2375
2376 if (ossl_quic_pkt_type_has_version(ch->qrx_pkt->hdr->type)
2377 && ch->qrx_pkt->hdr->version != QUIC_VERSION_1)
2378 /*
2379 * RFC 9000 s. 5.2.1: If a client receives a packet that uses a
2380 * different version than it initially selected, it MUST discard the
2381 * packet. We only ever use v1, so require it.
2382 */
2383 return;
2384
2385 if (ch->qrx_pkt->hdr->type == QUIC_PKT_TYPE_VERSION_NEG) {
2386
2387 /*
2388 * Sanity check. Version negotiation packet MUST have a version
2389 * value of 0 according to the RFC. We must discard such packets
2390 */
2391 if (ch->qrx_pkt->hdr->version != 0)
2392 return;
2393
2394 /*
2395 * RFC 9000 s. 6.2: If a client receives a version negotiation
2396 * packet, we need to do the following:
2397 * a) If the negotiation packet lists the version we initially sent
2398 * then we must abandon this connection attempt
2399 * b) We have to select a version from the list provided in the
2400 * version negotiation packet, and retry the connection attempt
2401 * in much the same way that ch_retry does, but we can reuse the
2402 * connection id values
2403 */
2404
2405 if (old_have_processed_any_pkt == 1) {
2406 /*
2407 * We've gotten previous packets, need to discard this.
2408 */
2409 return;
2410 }
2411
2412 /*
2413 * Indicate that we have processed a packet, as any subsequently
2414 * received version negotiation packet must be discarded above
2415 */
2416 ch->have_processed_any_pkt = 1;
2417
2418 /*
2419 * Following the header, version negotiation packets
2420 * contain an array of 32 bit integers representing
2421 * the supported versions that the server honors
2422 * this array, bounded by the hdr->len field
2423 * needs to be traversed so that we can find a matching
2424 * version
2425 */
2426 if (!PACKET_buf_init(&vpkt, ch->qrx_pkt->hdr->data,
2427 ch->qrx_pkt->hdr->len))
2428 return;
2429
2430 while (PACKET_remaining(&vpkt) > 0) {
2431 /*
2432 * We only support quic version 1 at the moment, so
2433 * look to see if thats offered
2434 */
2435 if (!PACKET_get_net_4(&vpkt, &supported_ver))
2436 return;
2437
2438 if (supported_ver == QUIC_VERSION_1) {
2439 /*
2440 * If the server supports version 1, set it as
2441 * the packetisers version
2442 */
2443 ossl_quic_tx_packetiser_set_protocol_version(ch->txp, QUIC_VERSION_1);
2444
2445 /*
2446 * And then request a restart of the QUIC connection
2447 */
2448 if (!ch_restart(ch))
2449 ossl_quic_channel_raise_protocol_error(ch,
2450 OSSL_QUIC_ERR_INTERNAL_ERROR,
2451 0, "handling ver negotiation packet");
2452 return;
2453 }
2454 }
2455
2456 /*
2457 * If we get here, then the server doesn't support a version of the
2458 * protocol that we can handle, abandon the connection
2459 */
2460 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_CONNECTION_REFUSED,
2461 0, "unsupported protocol version");
2462 return;
2463 }
2464
2465 ch->have_processed_any_pkt = 1;
2466
2467 /*
2468 * RFC 9000 s. 17.2: "An endpoint MUST treat receipt of a packet that has a
2469 * non-zero value for [the reserved bits] after removing both packet and
2470 * header protection as a connection error of type PROTOCOL_VIOLATION."
2471 */
2472 if (ossl_quic_pkt_type_is_encrypted(ch->qrx_pkt->hdr->type)
2473 && ch->qrx_pkt->hdr->reserved != 0) {
2474 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_PROTOCOL_VIOLATION,
2475 0, "packet header reserved bits");
2476 return;
2477 }
2478
2479 iovec.buf = ch->qrx_pkt->hdr->data;
2480 iovec.buf_len = ch->qrx_pkt->hdr->len;
2481 ossl_qlog_event_transport_packet_received(ch_get_qlog(ch), ch->qrx_pkt->hdr,
2482 ch->qrx_pkt->pn, &iovec, 1,
2483 ch->qrx_pkt->datagram_id);
2484
2485 /* Handle incoming packet. */
2486 switch (ch->qrx_pkt->hdr->type) {
2487 case QUIC_PKT_TYPE_RETRY:
2488 if (ch->doing_retry || ch->is_server)
2489 /*
2490 * It is not allowed to ask a client to do a retry more than
2491 * once. Clients may not send retries.
2492 */
2493 return;
2494
2495 /*
2496 * RFC 9000 s 17.2.5.2: After the client has received and processed an
2497 * Initial or Retry packet from the server, it MUST discard any
2498 * subsequent Retry packets that it receives.
2499 */
2500 if (ch->have_received_enc_pkt)
2501 return;
2502
2503 if (ch->qrx_pkt->hdr->len <= QUIC_RETRY_INTEGRITY_TAG_LEN)
2504 /* Packets with zero-length Retry Tokens are invalid. */
2505 return;
2506
2507 /*
2508 * TODO(QUIC FUTURE): Theoretically this should probably be in the QRX.
2509 * However because validation is dependent on context (namely the
2510 * client's initial DCID) we can't do this cleanly. In the future we
2511 * should probably add a callback to the QRX to let it call us (via
2512 * the DEMUX) and ask us about the correct original DCID, rather
2513 * than allow the QRX to emit a potentially malformed packet to the
2514 * upper layers. However, special casing this will do for now.
2515 */
2516 if (!ossl_quic_validate_retry_integrity_tag(ch->port->engine->libctx,
2517 ch->port->engine->propq,
2518 ch->qrx_pkt->hdr,
2519 &ch->init_dcid))
2520 /* Malformed retry packet, ignore. */
2521 return;
2522
2523 if (!ch_retry(ch, ch->qrx_pkt->hdr->data,
2524 ch->qrx_pkt->hdr->len - QUIC_RETRY_INTEGRITY_TAG_LEN,
2525 &ch->qrx_pkt->hdr->src_conn_id, old_have_processed_any_pkt))
2526 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_INTERNAL_ERROR,
2527 0, "handling retry packet");
2528 break;
2529
2530 case QUIC_PKT_TYPE_0RTT:
2531 if (!ch->is_server)
2532 /* Clients should never receive 0-RTT packets. */
2533 return;
2534
2535 /*
2536 * TODO(QUIC 0RTT): Implement 0-RTT on the server side. We currently
2537 * do not need to implement this as a client can only do 0-RTT if we
2538 * have given it permission to in a previous session.
2539 */
2540 break;
2541
2542 case QUIC_PKT_TYPE_INITIAL:
2543 case QUIC_PKT_TYPE_HANDSHAKE:
2544 case QUIC_PKT_TYPE_1RTT:
2545 if (ch->is_server && ch->qrx_pkt->hdr->type == QUIC_PKT_TYPE_HANDSHAKE)
2546 /*
2547 * We automatically drop INITIAL EL keys when first successfully
2548 * decrypting a HANDSHAKE packet, as per the RFC.
2549 */
2550 ch_discard_el(ch, QUIC_ENC_LEVEL_INITIAL);
2551
2552 if (ch->rxku_in_progress
2553 && ch->qrx_pkt->hdr->type == QUIC_PKT_TYPE_1RTT
2554 && ch->qrx_pkt->pn >= ch->rxku_trigger_pn
2555 && ch->qrx_pkt->key_epoch < ossl_qrx_get_key_epoch(ch->qrx)) {
2556 /*
2557 * RFC 9001 s. 6.4: Packets with higher packet numbers MUST be
2558 * protected with either the same or newer packet protection keys
2559 * than packets with lower packet numbers. An endpoint that
2560 * successfully removes protection with old keys when newer keys
2561 * were used for packets with lower packet numbers MUST treat this
2562 * as a connection error of type KEY_UPDATE_ERROR.
2563 */
2564 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_KEY_UPDATE_ERROR,
2565 0, "new packet with old keys");
2566 break;
2567 }
2568
2569 if (!ch->is_server
2570 && ch->qrx_pkt->hdr->type == QUIC_PKT_TYPE_INITIAL
2571 && ch->qrx_pkt->hdr->token_len > 0) {
2572 /*
2573 * RFC 9000 s. 17.2.2: Clients that receive an Initial packet with a
2574 * non-zero Token Length field MUST either discard the packet or
2575 * generate a connection error of type PROTOCOL_VIOLATION.
2576 *
2577 * TODO(QUIC FUTURE): consider the implications of RFC 9000 s. 10.2.3
2578 * Immediate Close during the Handshake:
2579 * However, at the cost of reducing feedback about
2580 * errors for legitimate peers, some forms of denial of
2581 * service can be made more difficult for an attacker
2582 * if endpoints discard illegal packets rather than
2583 * terminating a connection with CONNECTION_CLOSE. For
2584 * this reason, endpoints MAY discard packets rather
2585 * than immediately close if errors are detected in
2586 * packets that lack authentication.
2587 * I.e. should we drop this packet instead of closing the connection?
2588 */
2589 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_PROTOCOL_VIOLATION,
2590 0, "client received initial token");
2591 break;
2592 }
2593
2594 /* This packet contains frames, pass to the RXDP. */
2595 ossl_quic_handle_frames(ch, ch->qrx_pkt); /* best effort */
2596
2597 if (ch->did_crypto_frame)
2598 ch_tick_tls(ch, channel_only, NULL);
2599
2600 break;
2601
2602 case QUIC_PKT_TYPE_VERSION_NEG:
2603 /*
2604 * "A client MUST discard any Version Negotiation packet if it has
2605 * received and successfully processed any other packet."
2606 */
2607 if (!old_have_processed_any_pkt)
2608 ch_rx_handle_version_neg(ch, ch->qrx_pkt);
2609
2610 break;
2611
2612 default:
2613 assert(0);
2614 break;
2615 }
2616
2617 }
2618
ch_rx_handle_version_neg(QUIC_CHANNEL * ch,OSSL_QRX_PKT * pkt)2619 static void ch_rx_handle_version_neg(QUIC_CHANNEL *ch, OSSL_QRX_PKT *pkt)
2620 {
2621 /*
2622 * We do not support version negotiation at this time. As per RFC 9000 s.
2623 * 6.2., we MUST abandon the connection attempt if we receive a Version
2624 * Negotiation packet, unless we have already successfully processed another
2625 * incoming packet, or the packet lists the QUIC version we want to use.
2626 */
2627 PACKET vpkt;
2628 unsigned long v;
2629
2630 if (!PACKET_buf_init(&vpkt, pkt->hdr->data, pkt->hdr->len))
2631 return;
2632
2633 while (PACKET_remaining(&vpkt) > 0) {
2634 if (!PACKET_get_net_4(&vpkt, &v))
2635 break;
2636
2637 if ((uint32_t)v == QUIC_VERSION_1)
2638 return;
2639 }
2640
2641 /* No match, this is a failure case. */
2642 ch_raise_version_neg_failure(ch);
2643 }
2644
ch_raise_version_neg_failure(QUIC_CHANNEL * ch)2645 static void ch_raise_version_neg_failure(QUIC_CHANNEL *ch)
2646 {
2647 QUIC_TERMINATE_CAUSE tcause = {0};
2648
2649 tcause.error_code = OSSL_QUIC_ERR_CONNECTION_REFUSED;
2650 tcause.reason = "version negotiation failure";
2651 tcause.reason_len = strlen(tcause.reason);
2652
2653 /*
2654 * Skip TERMINATING state; this is not considered a protocol error and we do
2655 * not send CONNECTION_CLOSE.
2656 */
2657 ch_start_terminating(ch, &tcause, 1);
2658 }
2659
2660 /* Try to generate packets and if possible, flush them to the network. */
ch_tx(QUIC_CHANNEL * ch,int * notify_other_threads)2661 static int ch_tx(QUIC_CHANNEL *ch, int *notify_other_threads)
2662 {
2663 QUIC_TXP_STATUS status;
2664 int res;
2665
2666 /*
2667 * RFC 9000 s. 10.2.2: Draining Connection State:
2668 * While otherwise identical to the closing state, an endpoint
2669 * in the draining state MUST NOT send any packets.
2670 * and:
2671 * An endpoint MUST NOT send further packets.
2672 */
2673 if (ossl_quic_channel_is_draining(ch))
2674 return 0;
2675
2676 if (ossl_quic_channel_is_closing(ch)) {
2677 /*
2678 * While closing, only send CONN_CLOSE if we've received more traffic
2679 * from the peer. Once we tell the TXP to generate CONN_CLOSE, all
2680 * future calls to it generate CONN_CLOSE frames, so otherwise we would
2681 * just constantly generate CONN_CLOSE frames.
2682 *
2683 * Confirming to RFC 9000 s. 10.2.1 Closing Connection State:
2684 * An endpoint SHOULD limit the rate at which it generates
2685 * packets in the closing state.
2686 */
2687 if (!ch->conn_close_queued)
2688 return 0;
2689
2690 ch->conn_close_queued = 0;
2691 }
2692
2693 /* Do TXKU if we need to. */
2694 ch_maybe_trigger_spontaneous_txku(ch);
2695
2696 ch->rxku_pending_confirm_done = 0;
2697
2698 /* Loop until we stop generating packets to send */
2699 do {
2700 /*
2701 * Send packet, if we need to. Best effort. The TXP consults the CC and
2702 * applies any limitations imposed by it, so we don't need to do it here.
2703 *
2704 * Best effort. In particular if TXP fails for some reason we should
2705 * still flush any queued packets which we already generated.
2706 */
2707 res = ossl_quic_tx_packetiser_generate(ch->txp, &status);
2708 if (status.sent_pkt > 0) {
2709 ch->have_sent_any_pkt = 1; /* Packet(s) were sent */
2710 ch->port->have_sent_any_pkt = 1;
2711
2712 /*
2713 * RFC 9000 s. 10.1. 'An endpoint also restarts its idle timer when
2714 * sending an ack-eliciting packet if no other ack-eliciting packets
2715 * have been sent since last receiving and processing a packet.'
2716 */
2717 if (status.sent_ack_eliciting
2718 && !ch->have_sent_ack_eliciting_since_rx) {
2719 ch_update_idle(ch);
2720 ch->have_sent_ack_eliciting_since_rx = 1;
2721 }
2722
2723 if (!ch->is_server && status.sent_handshake)
2724 /*
2725 * RFC 9001 s. 4.9.1: A client MUST discard Initial keys when it
2726 * first sends a Handshake packet.
2727 */
2728 ch_discard_el(ch, QUIC_ENC_LEVEL_INITIAL);
2729
2730 if (ch->rxku_pending_confirm_done)
2731 ch->rxku_pending_confirm = 0;
2732
2733 ch_update_ping_deadline(ch);
2734 }
2735
2736 if (!res) {
2737 /*
2738 * One case where TXP can fail is if we reach a TX PN of 2**62 - 1.
2739 * As per RFC 9000 s. 12.3, if this happens we MUST close the
2740 * connection without sending a CONNECTION_CLOSE frame. This is
2741 * actually handled as an emergent consequence of our design, as the
2742 * TX packetiser will never transmit another packet when the TX PN
2743 * reaches the limit.
2744 *
2745 * Calling the below function terminates the connection; its attempt
2746 * to schedule a CONNECTION_CLOSE frame will not actually cause a
2747 * packet to be transmitted for this reason.
2748 */
2749 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_INTERNAL_ERROR,
2750 0,
2751 "internal error (txp generate)");
2752 break;
2753 }
2754 } while (status.sent_pkt > 0);
2755
2756 /* Flush packets to network. */
2757 switch (ossl_qtx_flush_net(ch->qtx)) {
2758 case QTX_FLUSH_NET_RES_OK:
2759 case QTX_FLUSH_NET_RES_TRANSIENT_FAIL:
2760 /* Best effort, done for now. */
2761 break;
2762
2763 case QTX_FLUSH_NET_RES_PERMANENT_FAIL:
2764 default:
2765 /* Permanent underlying network BIO, start terminating. */
2766 ossl_quic_port_raise_net_error(ch->port, ch);
2767 break;
2768 }
2769
2770 /*
2771 * If we have datagrams we have yet to successfully transmit, we need to
2772 * notify other threads so that they can switch to polling on POLLOUT as
2773 * well as POLLIN.
2774 */
2775 if (ossl_qtx_get_queue_len_datagrams(ch->qtx) > 0)
2776 *notify_other_threads = 1;
2777
2778 return 1;
2779 }
2780
2781 /* Determine next tick deadline. */
ch_determine_next_tick_deadline(QUIC_CHANNEL * ch)2782 static OSSL_TIME ch_determine_next_tick_deadline(QUIC_CHANNEL *ch)
2783 {
2784 OSSL_TIME deadline;
2785 int i;
2786
2787 if (ossl_quic_channel_is_terminated(ch))
2788 return ossl_time_infinite();
2789
2790 deadline = ossl_ackm_get_loss_detection_deadline(ch->ackm);
2791 if (ossl_time_is_zero(deadline))
2792 deadline = ossl_time_infinite();
2793
2794 /*
2795 * Check the ack deadline for all enc_levels that are actually provisioned.
2796 * ACKs aren't restricted by CC.
2797 */
2798 for (i = 0; i < QUIC_ENC_LEVEL_NUM; i++) {
2799 if (ossl_qtx_is_enc_level_provisioned(ch->qtx, i)) {
2800 deadline = ossl_time_min(deadline,
2801 ossl_ackm_get_ack_deadline(ch->ackm,
2802 ossl_quic_enc_level_to_pn_space(i)));
2803 }
2804 }
2805
2806 /*
2807 * When do we need to send an ACK-eliciting packet to reset the idle
2808 * deadline timer for the peer?
2809 */
2810 if (!ossl_time_is_infinite(ch->ping_deadline))
2811 deadline = ossl_time_min(deadline, ch->ping_deadline);
2812
2813 /* Apply TXP wakeup deadline. */
2814 deadline = ossl_time_min(deadline,
2815 ossl_quic_tx_packetiser_get_deadline(ch->txp));
2816
2817 /* Is the terminating timer armed? */
2818 if (ossl_quic_channel_is_terminating(ch))
2819 deadline = ossl_time_min(deadline,
2820 ch->terminate_deadline);
2821 else if (!ossl_time_is_infinite(ch->idle_deadline))
2822 deadline = ossl_time_min(deadline,
2823 ch->idle_deadline);
2824
2825 /* When does the RXKU process complete? */
2826 if (ch->rxku_in_progress)
2827 deadline = ossl_time_min(deadline, ch->rxku_update_end_deadline);
2828
2829 return deadline;
2830 }
2831
2832 /*
2833 * QUIC Channel: Lifecycle Events
2834 * ==============================
2835 */
2836
2837 /*
2838 * Record a state transition. This is not necessarily a change to ch->state but
2839 * also includes the handshake becoming complete or confirmed, etc.
2840 */
ch_record_state_transition(QUIC_CHANNEL * ch,uint32_t new_state)2841 static void ch_record_state_transition(QUIC_CHANNEL *ch, uint32_t new_state)
2842 {
2843 uint32_t old_state = ch->state;
2844
2845 ch->state = new_state;
2846
2847 ossl_qlog_event_connectivity_connection_state_updated(ch_get_qlog(ch),
2848 old_state,
2849 new_state,
2850 ch->handshake_complete,
2851 ch->handshake_confirmed);
2852 }
2853
free_peer_token(const unsigned char * token,size_t token_len,void * arg)2854 static void free_peer_token(const unsigned char *token,
2855 size_t token_len, void *arg)
2856 {
2857 ossl_quic_free_peer_token((QUIC_TOKEN *)arg);
2858 }
2859
ossl_quic_channel_start(QUIC_CHANNEL * ch)2860 int ossl_quic_channel_start(QUIC_CHANNEL *ch)
2861 {
2862 QUIC_TOKEN *token;
2863
2864 if (ch->is_server)
2865 /*
2866 * This is not used by the server. The server moves to active
2867 * automatically on receiving an incoming connection.
2868 */
2869 return 0;
2870
2871 if (ch->state != QUIC_CHANNEL_STATE_IDLE)
2872 /* Calls to connect are idempotent */
2873 return 1;
2874
2875 /* Inform QTX of peer address. */
2876 if (!ossl_quic_tx_packetiser_set_peer(ch->txp, &ch->cur_peer_addr))
2877 return 0;
2878
2879 /*
2880 * Look to see if we have a token, and if so, set it on the packetiser
2881 */
2882 if (!ch->is_server
2883 && ossl_quic_get_peer_token(ch->port->channel_ctx,
2884 &ch->cur_peer_addr,
2885 &token)
2886 && !ossl_quic_tx_packetiser_set_initial_token(ch->txp, token->token,
2887 token->token_len,
2888 free_peer_token,
2889 token))
2890 free_peer_token(NULL, 0, token);
2891
2892 /* Plug in secrets for the Initial EL. */
2893 if (!ossl_quic_provide_initial_secret(ch->port->engine->libctx,
2894 ch->port->engine->propq,
2895 &ch->init_dcid,
2896 ch->is_server,
2897 ch->qrx, ch->qtx))
2898 return 0;
2899
2900 /*
2901 * Determine the QUIC Transport Parameters and serialize the transport
2902 * parameters block. (For servers, we do this later as we must defer
2903 * generation until we have received the client's transport parameters.)
2904 */
2905 if (!ch->is_server && !ch->got_local_transport_params
2906 && !ch_generate_transport_params(ch))
2907 return 0;
2908
2909 /* Change state. */
2910 ch_record_state_transition(ch, QUIC_CHANNEL_STATE_ACTIVE);
2911 ch->doing_proactive_ver_neg = 0; /* not currently supported */
2912
2913 ossl_qlog_event_connectivity_connection_started(ch_get_qlog(ch),
2914 &ch->init_dcid);
2915
2916 /* Handshake layer: start (e.g. send CH). */
2917 if (!ch_tick_tls(ch, /*channel_only=*/0, NULL))
2918 return 0;
2919
2920 ossl_quic_reactor_tick(ossl_quic_port_get0_reactor(ch->port), 0); /* best effort */
2921 return 1;
2922 }
2923
free_token(const unsigned char * token,size_t token_len,void * arg)2924 static void free_token(const unsigned char *token, size_t token_len, void *arg)
2925 {
2926 OPENSSL_free((char *)token);
2927 }
2928
2929 /* Start a locally initiated connection shutdown. */
ossl_quic_channel_local_close(QUIC_CHANNEL * ch,uint64_t app_error_code,const char * app_reason)2930 void ossl_quic_channel_local_close(QUIC_CHANNEL *ch, uint64_t app_error_code,
2931 const char *app_reason)
2932 {
2933 QUIC_TERMINATE_CAUSE tcause = {0};
2934
2935 if (ossl_quic_channel_is_term_any(ch))
2936 return;
2937
2938 tcause.app = 1;
2939 tcause.error_code = app_error_code;
2940 tcause.reason = app_reason;
2941 tcause.reason_len = app_reason != NULL ? strlen(app_reason) : 0;
2942 ch_start_terminating(ch, &tcause, 0);
2943 }
2944
2945 /**
2946 * ch_restart - Restarts the QUIC channel by simulating loss of the initial
2947 * packet. This forces the packet to be regenerated with the updated protocol
2948 * version number.
2949 *
2950 * @ch: Pointer to the QUIC_CHANNEL structure.
2951 *
2952 * Returns 1 on success, 0 on failure.
2953 */
ch_restart(QUIC_CHANNEL * ch)2954 static int ch_restart(QUIC_CHANNEL *ch)
2955 {
2956 /*
2957 * Just pretend we lost our initial packet, so it gets
2958 * regenerated, with our updated protocol version number
2959 */
2960 return ossl_ackm_mark_packet_pseudo_lost(ch->ackm, QUIC_PN_SPACE_INITIAL,
2961 /* PN= */ 0);
2962 }
2963
2964 /* Called when a server asks us to do a retry. */
ch_retry(QUIC_CHANNEL * ch,const unsigned char * retry_token,size_t retry_token_len,const QUIC_CONN_ID * retry_scid,int drop_later_pn)2965 static int ch_retry(QUIC_CHANNEL *ch,
2966 const unsigned char *retry_token,
2967 size_t retry_token_len,
2968 const QUIC_CONN_ID *retry_scid,
2969 int drop_later_pn)
2970 {
2971 void *buf;
2972 QUIC_PN pn = 0;
2973
2974 /*
2975 * RFC 9000 s. 17.2.5.1: "A client MUST discard a Retry packet that contains
2976 * a SCID field that is identical to the DCID field of its initial packet."
2977 */
2978 if (ossl_quic_conn_id_eq(&ch->init_dcid, retry_scid))
2979 return 1;
2980
2981 /* We change to using the SCID in the Retry packet as the DCID. */
2982 if (!ossl_quic_tx_packetiser_set_cur_dcid(ch->txp, retry_scid))
2983 return 0;
2984
2985 /*
2986 * Now we retry. We will release the Retry packet immediately, so copy
2987 * the token.
2988 */
2989 if ((buf = OPENSSL_memdup(retry_token, retry_token_len)) == NULL)
2990 return 0;
2991
2992 if (!ossl_quic_tx_packetiser_set_initial_token(ch->txp, buf,
2993 retry_token_len,
2994 free_token, NULL)) {
2995 /*
2996 * This may fail if the token we receive is too big for us to ever be
2997 * able to transmit in an outgoing Initial packet.
2998 */
2999 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_INVALID_TOKEN, 0,
3000 "received oversize token");
3001 OPENSSL_free(buf);
3002 return 0;
3003 }
3004
3005 ch->retry_scid = *retry_scid;
3006 ch->doing_retry = 1;
3007
3008 /*
3009 * If a retry isn't our first response, we need to drop packet number
3010 * one instead (i.e. the case where we did version negotiation first
3011 */
3012 if (drop_later_pn == 1)
3013 pn = 1;
3014
3015 /*
3016 * We need to stimulate the Initial EL to generate the first CRYPTO frame
3017 * again. We can do this most cleanly by simply forcing the ACKM to consider
3018 * the first Initial packet as lost, which it effectively was as the server
3019 * hasn't processed it. This also maintains the desired behaviour with e.g.
3020 * PNs not resetting and so on.
3021 *
3022 * The PN we used initially is always zero, because QUIC does not allow
3023 * repeated retries.
3024 */
3025 if (!ossl_ackm_mark_packet_pseudo_lost(ch->ackm, QUIC_PN_SPACE_INITIAL,
3026 pn))
3027 return 0;
3028
3029 /*
3030 * Plug in new secrets for the Initial EL. This is the only time we change
3031 * the secrets for an EL after we already provisioned it.
3032 */
3033 if (!ossl_quic_provide_initial_secret(ch->port->engine->libctx,
3034 ch->port->engine->propq,
3035 &ch->retry_scid,
3036 /*is_server=*/0,
3037 ch->qrx, ch->qtx))
3038 return 0;
3039
3040 return 1;
3041 }
3042
3043 /* Called when an EL is to be discarded. */
ch_discard_el(QUIC_CHANNEL * ch,uint32_t enc_level)3044 static int ch_discard_el(QUIC_CHANNEL *ch,
3045 uint32_t enc_level)
3046 {
3047 if (!ossl_assert(enc_level < QUIC_ENC_LEVEL_1RTT))
3048 return 0;
3049
3050 if ((ch->el_discarded & (1U << enc_level)) != 0)
3051 /* Already done. */
3052 return 1;
3053
3054 /* Best effort for all of these. */
3055 ossl_quic_tx_packetiser_discard_enc_level(ch->txp, enc_level);
3056 ossl_qrx_discard_enc_level(ch->qrx, enc_level);
3057 ossl_qtx_discard_enc_level(ch->qtx, enc_level);
3058
3059 if (enc_level != QUIC_ENC_LEVEL_0RTT) {
3060 uint32_t pn_space = ossl_quic_enc_level_to_pn_space(enc_level);
3061
3062 ossl_ackm_on_pkt_space_discarded(ch->ackm, pn_space);
3063
3064 /* We should still have crypto streams at this point. */
3065 if (!ossl_assert(ch->crypto_send[pn_space] != NULL)
3066 || !ossl_assert(ch->crypto_recv[pn_space] != NULL))
3067 return 0;
3068
3069 /* Get rid of the crypto stream state for the EL. */
3070 ossl_quic_sstream_free(ch->crypto_send[pn_space]);
3071 ch->crypto_send[pn_space] = NULL;
3072
3073 ossl_quic_rstream_free(ch->crypto_recv[pn_space]);
3074 ch->crypto_recv[pn_space] = NULL;
3075 }
3076
3077 ch->el_discarded |= (1U << enc_level);
3078 return 1;
3079 }
3080
3081 /* Intended to be called by the RXDP. */
ossl_quic_channel_on_handshake_confirmed(QUIC_CHANNEL * ch)3082 int ossl_quic_channel_on_handshake_confirmed(QUIC_CHANNEL *ch)
3083 {
3084 if (ch->handshake_confirmed)
3085 return 1;
3086
3087 if (!ch->handshake_complete) {
3088 /*
3089 * Does not make sense for handshake to be confirmed before it is
3090 * completed.
3091 */
3092 ossl_quic_channel_raise_protocol_error(ch, OSSL_QUIC_ERR_PROTOCOL_VIOLATION,
3093 OSSL_QUIC_FRAME_TYPE_HANDSHAKE_DONE,
3094 "handshake cannot be confirmed "
3095 "before it is completed");
3096 return 0;
3097 }
3098
3099 ch_discard_el(ch, QUIC_ENC_LEVEL_HANDSHAKE);
3100 ch->handshake_confirmed = 1;
3101 ch_record_state_transition(ch, ch->state);
3102 ossl_ackm_on_handshake_confirmed(ch->ackm);
3103 return 1;
3104 }
3105
3106 /*
3107 * Master function used when we want to start tearing down a connection:
3108 *
3109 * - If the connection is still IDLE we can go straight to TERMINATED;
3110 *
3111 * - If we are already TERMINATED this is a no-op.
3112 *
3113 * - If we are TERMINATING - CLOSING and we have now got a CONNECTION_CLOSE
3114 * from the peer (tcause->remote == 1), we move to TERMINATING - DRAINING.
3115 *
3116 * - If we are TERMINATING - DRAINING, we remain here until the terminating
3117 * timer expires.
3118 *
3119 * - Otherwise, we are in ACTIVE and move to TERMINATING - CLOSING.
3120 * if we caused the termination (e.g. we have sent a CONNECTION_CLOSE). Note
3121 * that we are considered to have caused a termination if we sent the first
3122 * CONNECTION_CLOSE frame, even if it is caused by a peer protocol
3123 * violation. If the peer sent the first CONNECTION_CLOSE frame, we move to
3124 * TERMINATING - DRAINING.
3125 *
3126 * We record the termination cause structure passed on the first call only.
3127 * Any successive calls have their termination cause data discarded;
3128 * once we start sending a CONNECTION_CLOSE frame, we don't change the details
3129 * in it.
3130 *
3131 * This conforms to RFC 9000 s. 10.2.1: Closing Connection State:
3132 * To minimize the state that an endpoint maintains for a closing
3133 * connection, endpoints MAY send the exact same packet in response
3134 * to any received packet.
3135 *
3136 * We don't drop any connection state (specifically packet protection keys)
3137 * even though we are permitted to. This conforms to RFC 9000 s. 10.2.1:
3138 * Closing Connection State:
3139 * An endpoint MAY retain packet protection keys for incoming
3140 * packets to allow it to read and process a CONNECTION_CLOSE frame.
3141 *
3142 * Note that we do not conform to these two from the same section:
3143 * An endpoint's selected connection ID and the QUIC version
3144 * are sufficient information to identify packets for a closing
3145 * connection; the endpoint MAY discard all other connection state.
3146 * and:
3147 * An endpoint MAY drop packet protection keys when entering the
3148 * closing state and send a packet containing a CONNECTION_CLOSE
3149 * frame in response to any UDP datagram that is received.
3150 */
copy_tcause(QUIC_TERMINATE_CAUSE * dst,const QUIC_TERMINATE_CAUSE * src)3151 static void copy_tcause(QUIC_TERMINATE_CAUSE *dst,
3152 const QUIC_TERMINATE_CAUSE *src)
3153 {
3154 dst->error_code = src->error_code;
3155 dst->frame_type = src->frame_type;
3156 dst->app = src->app;
3157 dst->remote = src->remote;
3158
3159 dst->reason = NULL;
3160 dst->reason_len = 0;
3161
3162 if (src->reason != NULL && src->reason_len > 0) {
3163 size_t l = src->reason_len;
3164 char *r;
3165
3166 if (l >= SIZE_MAX)
3167 --l;
3168
3169 /*
3170 * If this fails, dst->reason becomes NULL and we simply do not use a
3171 * reason. This ensures termination is infallible.
3172 */
3173 dst->reason = r = OPENSSL_memdup(src->reason, l + 1);
3174 if (r == NULL)
3175 return;
3176
3177 r[l] = '\0';
3178 dst->reason_len = l;
3179 }
3180 }
3181
ch_start_terminating(QUIC_CHANNEL * ch,const QUIC_TERMINATE_CAUSE * tcause,int force_immediate)3182 static void ch_start_terminating(QUIC_CHANNEL *ch,
3183 const QUIC_TERMINATE_CAUSE *tcause,
3184 int force_immediate)
3185 {
3186 /* No point sending anything if we haven't sent anything yet. */
3187 if (!ch->have_sent_any_pkt)
3188 force_immediate = 1;
3189
3190 switch (ch->state) {
3191 default:
3192 case QUIC_CHANNEL_STATE_IDLE:
3193 copy_tcause(&ch->terminate_cause, tcause);
3194 ch_on_terminating_timeout(ch);
3195 break;
3196
3197 case QUIC_CHANNEL_STATE_ACTIVE:
3198 copy_tcause(&ch->terminate_cause, tcause);
3199
3200 ossl_qlog_event_connectivity_connection_closed(ch_get_qlog(ch), tcause);
3201
3202 if (!force_immediate) {
3203 ch_record_state_transition(ch, tcause->remote
3204 ? QUIC_CHANNEL_STATE_TERMINATING_DRAINING
3205 : QUIC_CHANNEL_STATE_TERMINATING_CLOSING);
3206 /*
3207 * RFC 9000 s. 10.2 Immediate Close
3208 * These states SHOULD persist for at least three times
3209 * the current PTO interval as defined in [QUIC-RECOVERY].
3210 */
3211 ch->terminate_deadline
3212 = ossl_time_add(get_time(ch),
3213 ossl_time_multiply(ossl_ackm_get_pto_duration(ch->ackm),
3214 3));
3215
3216 if (!tcause->remote) {
3217 OSSL_QUIC_FRAME_CONN_CLOSE f = {0};
3218
3219 /* best effort */
3220 f.error_code = ch->terminate_cause.error_code;
3221 f.frame_type = ch->terminate_cause.frame_type;
3222 f.is_app = ch->terminate_cause.app;
3223 f.reason = (char *)ch->terminate_cause.reason;
3224 f.reason_len = ch->terminate_cause.reason_len;
3225 ossl_quic_tx_packetiser_schedule_conn_close(ch->txp, &f);
3226 /*
3227 * RFC 9000 s. 10.2.2 Draining Connection State:
3228 * An endpoint that receives a CONNECTION_CLOSE frame MAY
3229 * send a single packet containing a CONNECTION_CLOSE
3230 * frame before entering the draining state, using a
3231 * NO_ERROR code if appropriate
3232 */
3233 ch->conn_close_queued = 1;
3234 }
3235 } else {
3236 ch_on_terminating_timeout(ch);
3237 }
3238 break;
3239
3240 case QUIC_CHANNEL_STATE_TERMINATING_CLOSING:
3241 if (force_immediate)
3242 ch_on_terminating_timeout(ch);
3243 else if (tcause->remote)
3244 /*
3245 * RFC 9000 s. 10.2.2 Draining Connection State:
3246 * An endpoint MAY enter the draining state from the
3247 * closing state if it receives a CONNECTION_CLOSE frame,
3248 * which indicates that the peer is also closing or draining.
3249 */
3250 ch_record_state_transition(ch, QUIC_CHANNEL_STATE_TERMINATING_DRAINING);
3251
3252 break;
3253
3254 case QUIC_CHANNEL_STATE_TERMINATING_DRAINING:
3255 /*
3256 * Other than in the force-immediate case, we remain here until the
3257 * timeout expires.
3258 */
3259 if (force_immediate)
3260 ch_on_terminating_timeout(ch);
3261
3262 break;
3263
3264 case QUIC_CHANNEL_STATE_TERMINATED:
3265 /* No-op. */
3266 break;
3267 }
3268 }
3269
3270 /* For RXDP use. */
ossl_quic_channel_on_remote_conn_close(QUIC_CHANNEL * ch,OSSL_QUIC_FRAME_CONN_CLOSE * f)3271 void ossl_quic_channel_on_remote_conn_close(QUIC_CHANNEL *ch,
3272 OSSL_QUIC_FRAME_CONN_CLOSE *f)
3273 {
3274 QUIC_TERMINATE_CAUSE tcause = {0};
3275
3276 if (!ossl_quic_channel_is_active(ch))
3277 return;
3278
3279 tcause.remote = 1;
3280 tcause.app = f->is_app;
3281 tcause.error_code = f->error_code;
3282 tcause.frame_type = f->frame_type;
3283 tcause.reason = f->reason;
3284 tcause.reason_len = f->reason_len;
3285 ch_start_terminating(ch, &tcause, 0);
3286 }
3287
free_frame_data(unsigned char * buf,size_t buf_len,void * arg)3288 static void free_frame_data(unsigned char *buf, size_t buf_len, void *arg)
3289 {
3290 OPENSSL_free(buf);
3291 }
3292
ch_enqueue_retire_conn_id(QUIC_CHANNEL * ch,uint64_t seq_num)3293 static int ch_enqueue_retire_conn_id(QUIC_CHANNEL *ch, uint64_t seq_num)
3294 {
3295 BUF_MEM *buf_mem = NULL;
3296 WPACKET wpkt;
3297 size_t l;
3298
3299 ossl_quic_srtm_remove(ch->srtm, ch, seq_num);
3300
3301 if ((buf_mem = BUF_MEM_new()) == NULL)
3302 goto err;
3303
3304 if (!WPACKET_init(&wpkt, buf_mem))
3305 goto err;
3306
3307 if (!ossl_quic_wire_encode_frame_retire_conn_id(&wpkt, seq_num)) {
3308 WPACKET_cleanup(&wpkt);
3309 goto err;
3310 }
3311
3312 WPACKET_finish(&wpkt);
3313 if (!WPACKET_get_total_written(&wpkt, &l))
3314 goto err;
3315
3316 if (ossl_quic_cfq_add_frame(ch->cfq, 1, QUIC_PN_SPACE_APP,
3317 OSSL_QUIC_FRAME_TYPE_RETIRE_CONN_ID, 0,
3318 (unsigned char *)buf_mem->data, l,
3319 free_frame_data, NULL) == NULL)
3320 goto err;
3321
3322 buf_mem->data = NULL;
3323 BUF_MEM_free(buf_mem);
3324 return 1;
3325
3326 err:
3327 ossl_quic_channel_raise_protocol_error(ch,
3328 OSSL_QUIC_ERR_INTERNAL_ERROR,
3329 OSSL_QUIC_FRAME_TYPE_NEW_CONN_ID,
3330 "internal error enqueueing retire conn id");
3331 BUF_MEM_free(buf_mem);
3332 return 0;
3333 }
3334
ossl_quic_channel_on_new_conn_id(QUIC_CHANNEL * ch,OSSL_QUIC_FRAME_NEW_CONN_ID * f)3335 void ossl_quic_channel_on_new_conn_id(QUIC_CHANNEL *ch,
3336 OSSL_QUIC_FRAME_NEW_CONN_ID *f)
3337 {
3338 uint64_t new_remote_seq_num = ch->cur_remote_seq_num;
3339 uint64_t new_retire_prior_to = ch->cur_retire_prior_to;
3340
3341 if (!ossl_quic_channel_is_active(ch))
3342 return;
3343
3344 /* We allow only two active connection ids; first check some constraints */
3345 if (ch->cur_remote_dcid.id_len == 0) {
3346 /* Changing from 0 length connection id is disallowed */
3347 ossl_quic_channel_raise_protocol_error(ch,
3348 OSSL_QUIC_ERR_PROTOCOL_VIOLATION,
3349 OSSL_QUIC_FRAME_TYPE_NEW_CONN_ID,
3350 "zero length connection id in use");
3351
3352 return;
3353 }
3354
3355 if (f->seq_num > new_remote_seq_num)
3356 new_remote_seq_num = f->seq_num;
3357 if (f->retire_prior_to > new_retire_prior_to)
3358 new_retire_prior_to = f->retire_prior_to;
3359
3360 /*
3361 * RFC 9000-5.1.1: An endpoint MUST NOT provide more connection IDs
3362 * than the peer's limit.
3363 *
3364 * After processing a NEW_CONNECTION_ID frame and adding and retiring
3365 * active connection IDs, if the number of active connection IDs exceeds
3366 * the value advertised in its active_connection_id_limit transport
3367 * parameter, an endpoint MUST close the connection with an error of
3368 * type CONNECTION_ID_LIMIT_ERROR.
3369 */
3370 if (new_remote_seq_num - new_retire_prior_to > 1) {
3371 ossl_quic_channel_raise_protocol_error(ch,
3372 OSSL_QUIC_ERR_CONNECTION_ID_LIMIT_ERROR,
3373 OSSL_QUIC_FRAME_TYPE_NEW_CONN_ID,
3374 "active_connection_id limit violated");
3375 return;
3376 }
3377
3378 /*
3379 * RFC 9000-5.1.1: An endpoint MAY send connection IDs that temporarily
3380 * exceed a peer's limit if the NEW_CONNECTION_ID frame also requires
3381 * the retirement of any excess, by including a sufficiently large
3382 * value in the Retire Prior To field.
3383 *
3384 * RFC 9000-5.1.2: An endpoint SHOULD allow for sending and tracking
3385 * a number of RETIRE_CONNECTION_ID frames of at least twice the value
3386 * of the active_connection_id_limit transport parameter. An endpoint
3387 * MUST NOT forget a connection ID without retiring it, though it MAY
3388 * choose to treat having connection IDs in need of retirement that
3389 * exceed this limit as a connection error of type CONNECTION_ID_LIMIT_ERROR.
3390 *
3391 * We are a little bit more liberal than the minimum mandated.
3392 */
3393 if (new_retire_prior_to - ch->cur_retire_prior_to > 10) {
3394 ossl_quic_channel_raise_protocol_error(ch,
3395 OSSL_QUIC_ERR_CONNECTION_ID_LIMIT_ERROR,
3396 OSSL_QUIC_FRAME_TYPE_NEW_CONN_ID,
3397 "retiring connection id limit violated");
3398
3399 return;
3400 }
3401
3402 if (new_remote_seq_num > ch->cur_remote_seq_num) {
3403 /* Add new stateless reset token */
3404 if (!ossl_quic_srtm_add(ch->srtm, ch, new_remote_seq_num,
3405 &f->stateless_reset)) {
3406 ossl_quic_channel_raise_protocol_error(
3407 ch, OSSL_QUIC_ERR_CONNECTION_ID_LIMIT_ERROR,
3408 OSSL_QUIC_FRAME_TYPE_NEW_CONN_ID,
3409 "unable to store stateless reset token");
3410
3411 return;
3412 }
3413 ch->cur_remote_seq_num = new_remote_seq_num;
3414 ch->cur_remote_dcid = f->conn_id;
3415 ossl_quic_tx_packetiser_set_cur_dcid(ch->txp, &ch->cur_remote_dcid);
3416 }
3417
3418 /*
3419 * RFC 9000-5.1.2: Upon receipt of an increased Retire Prior To
3420 * field, the peer MUST stop using the corresponding connection IDs
3421 * and retire them with RETIRE_CONNECTION_ID frames before adding the
3422 * newly provided connection ID to the set of active connection IDs.
3423 */
3424
3425 /*
3426 * Note: RFC 9000 s. 19.15 says:
3427 * "An endpoint that receives a NEW_CONNECTION_ID frame with a sequence
3428 * number smaller than the Retire Prior To field of a previously received
3429 * NEW_CONNECTION_ID frame MUST send a corresponding
3430 * RETIRE_CONNECTION_ID frame that retires the newly received connection
3431 * ID, unless it has already done so for that sequence number."
3432 *
3433 * Since we currently always queue RETIRE_CONN_ID frames based on the Retire
3434 * Prior To field of a NEW_CONNECTION_ID frame immediately upon receiving
3435 * that NEW_CONNECTION_ID frame, by definition this will always be met.
3436 * This may change in future when we change our CID handling.
3437 */
3438 while (new_retire_prior_to > ch->cur_retire_prior_to) {
3439 if (!ch_enqueue_retire_conn_id(ch, ch->cur_retire_prior_to))
3440 break;
3441 ++ch->cur_retire_prior_to;
3442 }
3443 }
3444
ch_save_err_state(QUIC_CHANNEL * ch)3445 static void ch_save_err_state(QUIC_CHANNEL *ch)
3446 {
3447 if (ch->err_state == NULL)
3448 ch->err_state = OSSL_ERR_STATE_new();
3449
3450 if (ch->err_state == NULL)
3451 return;
3452
3453 OSSL_ERR_STATE_save(ch->err_state);
3454 }
3455
ossl_quic_channel_inject(QUIC_CHANNEL * ch,QUIC_URXE * e)3456 void ossl_quic_channel_inject(QUIC_CHANNEL *ch, QUIC_URXE *e)
3457 {
3458 ossl_qrx_inject_urxe(ch->qrx, e);
3459 }
3460
ossl_quic_channel_inject_pkt(QUIC_CHANNEL * ch,OSSL_QRX_PKT * qpkt)3461 void ossl_quic_channel_inject_pkt(QUIC_CHANNEL *ch, OSSL_QRX_PKT *qpkt)
3462 {
3463 ossl_qrx_inject_pkt(ch->qrx, qpkt);
3464 }
3465
ossl_quic_channel_on_stateless_reset(QUIC_CHANNEL * ch)3466 void ossl_quic_channel_on_stateless_reset(QUIC_CHANNEL *ch)
3467 {
3468 QUIC_TERMINATE_CAUSE tcause = {0};
3469
3470 tcause.error_code = OSSL_QUIC_ERR_NO_ERROR;
3471 tcause.remote = 1;
3472 ch_start_terminating(ch, &tcause, 0);
3473 }
3474
ossl_quic_channel_raise_net_error(QUIC_CHANNEL * ch)3475 void ossl_quic_channel_raise_net_error(QUIC_CHANNEL *ch)
3476 {
3477 QUIC_TERMINATE_CAUSE tcause = {0};
3478
3479 if (ch->net_error)
3480 return;
3481
3482 ch->net_error = 1;
3483
3484 tcause.error_code = OSSL_QUIC_ERR_INTERNAL_ERROR;
3485 tcause.reason = "network BIO I/O error";
3486 tcause.reason_len = strlen(tcause.reason);
3487
3488 /*
3489 * Skip Terminating state and go directly to Terminated, no point trying to
3490 * send CONNECTION_CLOSE if we cannot communicate.
3491 */
3492 ch_start_terminating(ch, &tcause, 1);
3493 }
3494
ossl_quic_channel_net_error(QUIC_CHANNEL * ch)3495 int ossl_quic_channel_net_error(QUIC_CHANNEL *ch)
3496 {
3497 return ch->net_error;
3498 }
3499
ossl_quic_channel_restore_err_state(QUIC_CHANNEL * ch)3500 void ossl_quic_channel_restore_err_state(QUIC_CHANNEL *ch)
3501 {
3502 if (ch == NULL)
3503 return;
3504
3505 if (!ossl_quic_port_is_running(ch->port))
3506 ossl_quic_port_restore_err_state(ch->port);
3507 else
3508 OSSL_ERR_STATE_restore(ch->err_state);
3509 }
3510
ossl_quic_channel_raise_protocol_error_loc(QUIC_CHANNEL * ch,uint64_t error_code,uint64_t frame_type,const char * reason,ERR_STATE * err_state,const char * src_file,int src_line,const char * src_func)3511 void ossl_quic_channel_raise_protocol_error_loc(QUIC_CHANNEL *ch,
3512 uint64_t error_code,
3513 uint64_t frame_type,
3514 const char *reason,
3515 ERR_STATE *err_state,
3516 const char *src_file,
3517 int src_line,
3518 const char *src_func)
3519 {
3520 QUIC_TERMINATE_CAUSE tcause = {0};
3521 int err_reason = error_code == OSSL_QUIC_ERR_INTERNAL_ERROR
3522 ? ERR_R_INTERNAL_ERROR : SSL_R_QUIC_PROTOCOL_ERROR;
3523 const char *err_str = ossl_quic_err_to_string(error_code);
3524 const char *err_str_pfx = " (", *err_str_sfx = ")";
3525 const char *ft_str = NULL;
3526 const char *ft_str_pfx = " (", *ft_str_sfx = ")";
3527
3528 if (ch->protocol_error)
3529 /* Only the first call to this function matters. */
3530 return;
3531
3532 if (err_str == NULL) {
3533 err_str = "";
3534 err_str_pfx = "";
3535 err_str_sfx = "";
3536 }
3537
3538 /*
3539 * If we were provided an underlying error state, restore it and then append
3540 * our ERR on top as a "cover letter" error.
3541 */
3542 if (err_state != NULL)
3543 OSSL_ERR_STATE_restore(err_state);
3544
3545 if (frame_type != 0) {
3546 ft_str = ossl_quic_frame_type_to_string(frame_type);
3547 if (ft_str == NULL) {
3548 ft_str = "";
3549 ft_str_pfx = "";
3550 ft_str_sfx = "";
3551 }
3552
3553 ERR_raise_data(ERR_LIB_SSL, err_reason,
3554 "QUIC error code: 0x%llx%s%s%s "
3555 "(triggered by frame type: 0x%llx%s%s%s), reason: \"%s\"",
3556 (unsigned long long) error_code,
3557 err_str_pfx, err_str, err_str_sfx,
3558 (unsigned long long) frame_type,
3559 ft_str_pfx, ft_str, ft_str_sfx,
3560 reason);
3561 } else {
3562 ERR_raise_data(ERR_LIB_SSL, err_reason,
3563 "QUIC error code: 0x%llx%s%s%s, reason: \"%s\"",
3564 (unsigned long long) error_code,
3565 err_str_pfx, err_str, err_str_sfx,
3566 reason);
3567 }
3568
3569 if (src_file != NULL)
3570 ERR_set_debug(src_file, src_line, src_func);
3571
3572 ch_save_err_state(ch);
3573
3574 tcause.error_code = error_code;
3575 tcause.frame_type = frame_type;
3576 tcause.reason = reason;
3577 tcause.reason_len = strlen(reason);
3578
3579 ch->protocol_error = 1;
3580 ch_start_terminating(ch, &tcause, 0);
3581 }
3582
3583 /*
3584 * Called once the terminating timer expires, meaning we move from TERMINATING
3585 * to TERMINATED.
3586 */
ch_on_terminating_timeout(QUIC_CHANNEL * ch)3587 static void ch_on_terminating_timeout(QUIC_CHANNEL *ch)
3588 {
3589 ch_record_state_transition(ch, QUIC_CHANNEL_STATE_TERMINATED);
3590 }
3591
3592 /*
3593 * Determines the effective idle timeout duration. This is based on the idle
3594 * timeout values that we and our peer signalled in transport parameters
3595 * but have some limits applied.
3596 */
ch_get_effective_idle_timeout_duration(QUIC_CHANNEL * ch)3597 static OSSL_TIME ch_get_effective_idle_timeout_duration(QUIC_CHANNEL *ch)
3598 {
3599 OSSL_TIME pto;
3600
3601 if (ch->max_idle_timeout == 0)
3602 return ossl_time_infinite();
3603
3604 /*
3605 * RFC 9000 s. 10.1: Idle Timeout
3606 * To avoid excessively small idle timeout periods, endpoints
3607 * MUST increase the idle timeout period to be at least three
3608 * times the current Probe Timeout (PTO). This allows for
3609 * multiple PTOs to expire, and therefore multiple probes to
3610 * be sent and lost, prior to idle timeout.
3611 */
3612 pto = ossl_ackm_get_pto_duration(ch->ackm);
3613 return ossl_time_max(ossl_ms2time(ch->max_idle_timeout),
3614 ossl_time_multiply(pto, 3));
3615 }
3616
3617 /*
3618 * Updates our idle deadline. Called when an event happens which should bump the
3619 * idle timeout.
3620 */
ch_update_idle(QUIC_CHANNEL * ch)3621 static void ch_update_idle(QUIC_CHANNEL *ch)
3622 {
3623 ch->idle_deadline = ossl_time_add(get_time(ch),
3624 ch_get_effective_idle_timeout_duration(ch));
3625 }
3626
3627 /*
3628 * Updates our ping deadline, which determines when we next generate a ping if
3629 * we don't have any other ACK-eliciting frames to send.
3630 */
ch_update_ping_deadline(QUIC_CHANNEL * ch)3631 static void ch_update_ping_deadline(QUIC_CHANNEL *ch)
3632 {
3633 OSSL_TIME max_span, idle_duration;
3634
3635 idle_duration = ch_get_effective_idle_timeout_duration(ch);
3636 if (ossl_time_is_infinite(idle_duration)) {
3637 ch->ping_deadline = ossl_time_infinite();
3638 return;
3639 }
3640
3641 /*
3642 * Maximum amount of time without traffic before we send a PING to keep
3643 * the connection open. Usually we use max_idle_timeout/2, but ensure
3644 * the period never exceeds the assumed NAT interval to ensure NAT
3645 * devices don't have their state time out (RFC 9000 s. 10.1.2).
3646 */
3647 max_span = ossl_time_divide(idle_duration, 2);
3648 max_span = ossl_time_min(max_span, MAX_NAT_INTERVAL);
3649 ch->ping_deadline = ossl_time_add(get_time(ch), max_span);
3650 }
3651
3652 /* Called when the idle timeout expires. */
ch_on_idle_timeout(QUIC_CHANNEL * ch)3653 static void ch_on_idle_timeout(QUIC_CHANNEL *ch)
3654 {
3655 /*
3656 * Idle timeout does not have an error code associated with it because a
3657 * CONN_CLOSE is never sent for it. We shouldn't use this data once we reach
3658 * TERMINATED anyway.
3659 */
3660 ch->terminate_cause.app = 0;
3661 ch->terminate_cause.error_code = OSSL_QUIC_LOCAL_ERR_IDLE_TIMEOUT;
3662 ch->terminate_cause.frame_type = 0;
3663
3664 ch_record_state_transition(ch, QUIC_CHANNEL_STATE_TERMINATED);
3665 }
3666
3667 /**
3668 * @brief Common handler for initializing a new QUIC connection.
3669 *
3670 * This function configures a QUIC channel (`QUIC_CHANNEL *ch`) for a new
3671 * connection by setting the peer address, connection IDs, and necessary
3672 * callbacks. It establishes initial secrets, sets up logging, and performs
3673 * required transitions for the channel state.
3674 *
3675 * @param ch Pointer to the QUIC channel being initialized.
3676 * @param peer Address of the peer to which the channel connects.
3677 * @param peer_scid Peer-specified source connection ID.
3678 * @param peer_dcid Peer-specified destination connection ID.
3679 * @param peer_odcid Peer-specified original destination connection ID
3680 * may be NULL if retry frame not sent to client
3681 * @return 1 on success, 0 on failure to set required elements.
3682 */
ch_on_new_conn_common(QUIC_CHANNEL * ch,const BIO_ADDR * peer,const QUIC_CONN_ID * peer_scid,const QUIC_CONN_ID * peer_dcid,const QUIC_CONN_ID * peer_odcid)3683 static int ch_on_new_conn_common(QUIC_CHANNEL *ch, const BIO_ADDR *peer,
3684 const QUIC_CONN_ID *peer_scid,
3685 const QUIC_CONN_ID *peer_dcid,
3686 const QUIC_CONN_ID *peer_odcid)
3687 {
3688 /* Note our newly learnt peer address and CIDs. */
3689 if (!BIO_ADDR_copy(&ch->cur_peer_addr, peer))
3690 return 0;
3691
3692 ch->init_dcid = *peer_dcid;
3693 ch->cur_remote_dcid = *peer_scid;
3694 ch->odcid.id_len = 0;
3695
3696 if (peer_odcid != NULL)
3697 ch->odcid = *peer_odcid;
3698
3699 /* Inform QTX of peer address. */
3700 if (!ossl_quic_tx_packetiser_set_peer(ch->txp, &ch->cur_peer_addr))
3701 return 0;
3702
3703 /* Inform TXP of desired CIDs. */
3704 if (!ossl_quic_tx_packetiser_set_cur_dcid(ch->txp, &ch->cur_remote_dcid))
3705 return 0;
3706
3707 if (!ossl_quic_tx_packetiser_set_cur_scid(ch->txp, &ch->cur_local_cid))
3708 return 0;
3709
3710 /* Setup QLOG, which did not happen earlier due to lacking an Initial ODCID. */
3711 ossl_qtx_set_qlog_cb(ch->qtx, ch_get_qlog_cb, ch);
3712 ossl_quic_tx_packetiser_set_qlog_cb(ch->txp, ch_get_qlog_cb, ch);
3713
3714 /*
3715 * Plug in secrets for the Initial EL. secrets for QRX were created in
3716 * port_default_packet_handler() already.
3717 */
3718 if (!ossl_quic_provide_initial_secret(ch->port->engine->libctx,
3719 ch->port->engine->propq,
3720 &ch->init_dcid,
3721 /*is_server=*/1,
3722 NULL, ch->qtx))
3723 return 0;
3724
3725 /* Register the peer ODCID in the LCIDM. */
3726 if (!ossl_quic_lcidm_enrol_odcid(ch->lcidm, ch, peer_odcid == NULL ?
3727 &ch->init_dcid :
3728 peer_odcid))
3729 return 0;
3730
3731 /* Change state. */
3732 ch_record_state_transition(ch, QUIC_CHANNEL_STATE_ACTIVE);
3733 ch->doing_proactive_ver_neg = 0; /* not currently supported */
3734 return 1;
3735 }
3736
3737 /* Called when we, as a server, get a new incoming connection. */
ossl_quic_channel_on_new_conn(QUIC_CHANNEL * ch,const BIO_ADDR * peer,const QUIC_CONN_ID * peer_scid,const QUIC_CONN_ID * peer_dcid)3738 int ossl_quic_channel_on_new_conn(QUIC_CHANNEL *ch, const BIO_ADDR *peer,
3739 const QUIC_CONN_ID *peer_scid,
3740 const QUIC_CONN_ID *peer_dcid)
3741 {
3742 if (!ossl_assert(ch->state == QUIC_CHANNEL_STATE_IDLE && ch->is_server))
3743 return 0;
3744
3745 /* Generate an Initial LCID we will use for the connection. */
3746 if (!ossl_quic_lcidm_generate_initial(ch->lcidm, ch, &ch->cur_local_cid))
3747 return 0;
3748
3749 return ch_on_new_conn_common(ch, peer, peer_scid, peer_dcid, NULL);
3750 }
3751
3752 /**
3753 * Binds a QUIC channel to a specific peer's address and connection IDs.
3754 *
3755 * This function is used to establish a binding between a QUIC channel and a
3756 * peer's address and connection IDs. The binding is performed only if the
3757 * channel is idle and is on the server side. The peer's destination connection
3758 * ID (`peer_dcid`) is mandatory, and the channel's current local connection ID
3759 * is set to this value.
3760 *
3761 * @param ch Pointer to the QUIC_CHANNEL structure representing the
3762 * channel to be bound.
3763 * @param peer Pointer to a BIO_ADDR structure representing the peer's
3764 * address.
3765 * @param peer_scid Pointer to the peer's source connection ID (QUIC_CONN_ID).
3766 * @param peer_dcid Pointer to the peer's destination connection ID
3767 * (QUIC_CONN_ID). This must not be NULL.
3768 * @param peer_odcid Pointer to the original destination connection ID
3769 * (QUIC_CONN_ID) chosen by the peer in its first initial
3770 * packet received without a token.
3771 *
3772 * @return 1 on success, or 0 on failure if the conditions for binding are not
3773 * met (e.g., channel is not idle or not a server, or binding fails).
3774 */
ossl_quic_bind_channel(QUIC_CHANNEL * ch,const BIO_ADDR * peer,const QUIC_CONN_ID * peer_scid,const QUIC_CONN_ID * peer_dcid,const QUIC_CONN_ID * peer_odcid)3775 int ossl_quic_bind_channel(QUIC_CHANNEL *ch, const BIO_ADDR *peer,
3776 const QUIC_CONN_ID *peer_scid,
3777 const QUIC_CONN_ID *peer_dcid,
3778 const QUIC_CONN_ID *peer_odcid)
3779 {
3780 if (peer_dcid == NULL)
3781 return 0;
3782
3783 if (!ossl_assert(ch->state == QUIC_CHANNEL_STATE_IDLE && ch->is_server))
3784 return 0;
3785
3786 ch->cur_local_cid = *peer_dcid;
3787 if (!ossl_quic_lcidm_bind_channel(ch->lcidm, ch, peer_dcid))
3788 return 0;
3789
3790 /*
3791 * peer_odcid <=> is initial dst conn id chosen by peer in its
3792 * first initial packet we received without token.
3793 */
3794 return ch_on_new_conn_common(ch, peer, peer_scid, peer_dcid, peer_odcid);
3795 }
3796
ossl_quic_channel_get0_ssl(QUIC_CHANNEL * ch)3797 SSL *ossl_quic_channel_get0_ssl(QUIC_CHANNEL *ch)
3798 {
3799 return ch->tls;
3800 }
3801
ch_init_new_stream(QUIC_CHANNEL * ch,QUIC_STREAM * qs,int can_send,int can_recv)3802 static int ch_init_new_stream(QUIC_CHANNEL *ch, QUIC_STREAM *qs,
3803 int can_send, int can_recv)
3804 {
3805 uint64_t rxfc_wnd;
3806 int server_init = ossl_quic_stream_is_server_init(qs);
3807 int local_init = (ch->is_server == server_init);
3808 int is_uni = !ossl_quic_stream_is_bidi(qs);
3809
3810 if (can_send)
3811 if ((qs->sstream = ossl_quic_sstream_new(INIT_APP_BUF_LEN)) == NULL)
3812 goto err;
3813
3814 if (can_recv)
3815 if ((qs->rstream = ossl_quic_rstream_new(NULL, NULL, 0)) == NULL)
3816 goto err;
3817
3818 /* TXFC */
3819 if (!ossl_quic_txfc_init(&qs->txfc, &ch->conn_txfc))
3820 goto err;
3821
3822 if (ch->got_remote_transport_params) {
3823 /*
3824 * If we already got peer TPs we need to apply the initial CWM credit
3825 * now. If we didn't already get peer TPs this will be done
3826 * automatically for all extant streams when we do.
3827 */
3828 if (can_send) {
3829 uint64_t cwm;
3830
3831 if (is_uni)
3832 cwm = ch->rx_init_max_stream_data_uni;
3833 else if (local_init)
3834 cwm = ch->rx_init_max_stream_data_bidi_local;
3835 else
3836 cwm = ch->rx_init_max_stream_data_bidi_remote;
3837
3838 ossl_quic_txfc_bump_cwm(&qs->txfc, cwm);
3839 }
3840 }
3841
3842 /* RXFC */
3843 if (!can_recv)
3844 rxfc_wnd = 0;
3845 else if (is_uni)
3846 rxfc_wnd = ch->tx_init_max_stream_data_uni;
3847 else if (local_init)
3848 rxfc_wnd = ch->tx_init_max_stream_data_bidi_local;
3849 else
3850 rxfc_wnd = ch->tx_init_max_stream_data_bidi_remote;
3851
3852 if (!ossl_quic_rxfc_init(&qs->rxfc, &ch->conn_rxfc,
3853 rxfc_wnd,
3854 DEFAULT_STREAM_RXFC_MAX_WND_MUL * rxfc_wnd,
3855 get_time, ch))
3856 goto err;
3857
3858 return 1;
3859
3860 err:
3861 ossl_quic_sstream_free(qs->sstream);
3862 qs->sstream = NULL;
3863 ossl_quic_rstream_free(qs->rstream);
3864 qs->rstream = NULL;
3865 return 0;
3866 }
3867
ch_get_local_stream_next_ordinal_ptr(QUIC_CHANNEL * ch,int is_uni)3868 static uint64_t *ch_get_local_stream_next_ordinal_ptr(QUIC_CHANNEL *ch,
3869 int is_uni)
3870 {
3871 return is_uni ? &ch->next_local_stream_ordinal_uni
3872 : &ch->next_local_stream_ordinal_bidi;
3873 }
3874
ch_get_local_stream_max_ptr(const QUIC_CHANNEL * ch,int is_uni)3875 static const uint64_t *ch_get_local_stream_max_ptr(const QUIC_CHANNEL *ch,
3876 int is_uni)
3877 {
3878 return is_uni ? &ch->max_local_streams_uni
3879 : &ch->max_local_streams_bidi;
3880 }
3881
ch_get_remote_stream_count_rxfc(const QUIC_CHANNEL * ch,int is_uni)3882 static const QUIC_RXFC *ch_get_remote_stream_count_rxfc(const QUIC_CHANNEL *ch,
3883 int is_uni)
3884 {
3885 return is_uni ? &ch->max_streams_uni_rxfc
3886 : &ch->max_streams_bidi_rxfc;
3887 }
3888
ossl_quic_channel_is_new_local_stream_admissible(QUIC_CHANNEL * ch,int is_uni)3889 int ossl_quic_channel_is_new_local_stream_admissible(QUIC_CHANNEL *ch,
3890 int is_uni)
3891 {
3892 const uint64_t *p_next_ordinal = ch_get_local_stream_next_ordinal_ptr(ch, is_uni);
3893
3894 return ossl_quic_stream_map_is_local_allowed_by_stream_limit(&ch->qsm,
3895 *p_next_ordinal,
3896 is_uni);
3897 }
3898
ossl_quic_channel_get_local_stream_count_avail(const QUIC_CHANNEL * ch,int is_uni)3899 uint64_t ossl_quic_channel_get_local_stream_count_avail(const QUIC_CHANNEL *ch,
3900 int is_uni)
3901 {
3902 const uint64_t *p_next_ordinal, *p_max;
3903
3904 p_next_ordinal = ch_get_local_stream_next_ordinal_ptr((QUIC_CHANNEL *)ch,
3905 is_uni);
3906 p_max = ch_get_local_stream_max_ptr(ch, is_uni);
3907
3908 return *p_max - *p_next_ordinal;
3909 }
3910
ossl_quic_channel_get_remote_stream_count_avail(const QUIC_CHANNEL * ch,int is_uni)3911 uint64_t ossl_quic_channel_get_remote_stream_count_avail(const QUIC_CHANNEL *ch,
3912 int is_uni)
3913 {
3914 return ossl_quic_rxfc_get_credit(ch_get_remote_stream_count_rxfc(ch, is_uni));
3915 }
3916
ossl_quic_channel_new_stream_local(QUIC_CHANNEL * ch,int is_uni)3917 QUIC_STREAM *ossl_quic_channel_new_stream_local(QUIC_CHANNEL *ch, int is_uni)
3918 {
3919 QUIC_STREAM *qs;
3920 int type;
3921 uint64_t stream_id;
3922 uint64_t *p_next_ordinal;
3923
3924 type = ch->is_server ? QUIC_STREAM_INITIATOR_SERVER
3925 : QUIC_STREAM_INITIATOR_CLIENT;
3926
3927 p_next_ordinal = ch_get_local_stream_next_ordinal_ptr(ch, is_uni);
3928
3929 if (is_uni)
3930 type |= QUIC_STREAM_DIR_UNI;
3931 else
3932 type |= QUIC_STREAM_DIR_BIDI;
3933
3934 if (*p_next_ordinal >= ((uint64_t)1) << 62)
3935 return NULL;
3936
3937 stream_id = ((*p_next_ordinal) << 2) | type;
3938
3939 if ((qs = ossl_quic_stream_map_alloc(&ch->qsm, stream_id, type)) == NULL)
3940 return NULL;
3941
3942 /* Locally-initiated stream, so we always want a send buffer. */
3943 if (!ch_init_new_stream(ch, qs, /*can_send=*/1, /*can_recv=*/!is_uni))
3944 goto err;
3945
3946 ++*p_next_ordinal;
3947 return qs;
3948
3949 err:
3950 ossl_quic_stream_map_release(&ch->qsm, qs);
3951 return NULL;
3952 }
3953
ossl_quic_channel_new_stream_remote(QUIC_CHANNEL * ch,uint64_t stream_id)3954 QUIC_STREAM *ossl_quic_channel_new_stream_remote(QUIC_CHANNEL *ch,
3955 uint64_t stream_id)
3956 {
3957 uint64_t peer_role;
3958 int is_uni;
3959 QUIC_STREAM *qs;
3960
3961 peer_role = ch->is_server
3962 ? QUIC_STREAM_INITIATOR_CLIENT
3963 : QUIC_STREAM_INITIATOR_SERVER;
3964
3965 if ((stream_id & QUIC_STREAM_INITIATOR_MASK) != peer_role)
3966 return NULL;
3967
3968 is_uni = ((stream_id & QUIC_STREAM_DIR_MASK) == QUIC_STREAM_DIR_UNI);
3969
3970 qs = ossl_quic_stream_map_alloc(&ch->qsm, stream_id,
3971 stream_id & (QUIC_STREAM_INITIATOR_MASK
3972 | QUIC_STREAM_DIR_MASK));
3973 if (qs == NULL)
3974 return NULL;
3975
3976 if (!ch_init_new_stream(ch, qs, /*can_send=*/!is_uni, /*can_recv=*/1))
3977 goto err;
3978
3979 if (ch->incoming_stream_auto_reject)
3980 ossl_quic_channel_reject_stream(ch, qs);
3981 else
3982 ossl_quic_stream_map_push_accept_queue(&ch->qsm, qs);
3983
3984 return qs;
3985
3986 err:
3987 ossl_quic_stream_map_release(&ch->qsm, qs);
3988 return NULL;
3989 }
3990
ossl_quic_channel_set_incoming_stream_auto_reject(QUIC_CHANNEL * ch,int enable,uint64_t aec)3991 void ossl_quic_channel_set_incoming_stream_auto_reject(QUIC_CHANNEL *ch,
3992 int enable,
3993 uint64_t aec)
3994 {
3995 ch->incoming_stream_auto_reject = (enable != 0);
3996 ch->incoming_stream_auto_reject_aec = aec;
3997 }
3998
ossl_quic_channel_reject_stream(QUIC_CHANNEL * ch,QUIC_STREAM * qs)3999 void ossl_quic_channel_reject_stream(QUIC_CHANNEL *ch, QUIC_STREAM *qs)
4000 {
4001 ossl_quic_stream_map_stop_sending_recv_part(&ch->qsm, qs,
4002 ch->incoming_stream_auto_reject_aec);
4003
4004 ossl_quic_stream_map_reset_stream_send_part(&ch->qsm, qs,
4005 ch->incoming_stream_auto_reject_aec);
4006 qs->deleted = 1;
4007
4008 ossl_quic_stream_map_update_state(&ch->qsm, qs);
4009 }
4010
4011 /* Replace local connection ID in TXP and DEMUX for testing purposes. */
ossl_quic_channel_replace_local_cid(QUIC_CHANNEL * ch,const QUIC_CONN_ID * conn_id)4012 int ossl_quic_channel_replace_local_cid(QUIC_CHANNEL *ch,
4013 const QUIC_CONN_ID *conn_id)
4014 {
4015 /* Remove the current LCID from the LCIDM. */
4016 if (!ossl_quic_lcidm_debug_remove(ch->lcidm, &ch->cur_local_cid))
4017 return 0;
4018 ch->cur_local_cid = *conn_id;
4019 /* Set in the TXP, used only for long header packets. */
4020 if (!ossl_quic_tx_packetiser_set_cur_scid(ch->txp, &ch->cur_local_cid))
4021 return 0;
4022 /* Add the new LCID to the LCIDM. */
4023 if (!ossl_quic_lcidm_debug_add(ch->lcidm, ch, &ch->cur_local_cid,
4024 100))
4025 return 0;
4026 return 1;
4027 }
4028
ossl_quic_channel_set_msg_callback(QUIC_CHANNEL * ch,ossl_msg_cb msg_callback,SSL * msg_callback_ssl)4029 void ossl_quic_channel_set_msg_callback(QUIC_CHANNEL *ch,
4030 ossl_msg_cb msg_callback,
4031 SSL *msg_callback_ssl)
4032 {
4033 ch->msg_callback = msg_callback;
4034 ch->msg_callback_ssl = msg_callback_ssl;
4035 ossl_qtx_set_msg_callback(ch->qtx, msg_callback, msg_callback_ssl);
4036 ossl_quic_tx_packetiser_set_msg_callback(ch->txp, msg_callback,
4037 msg_callback_ssl);
4038 /*
4039 * postpone msg callback setting for tserver until port calls
4040 * port_bind_channel().
4041 */
4042 if (ch->is_tserver_ch == 0)
4043 ossl_qrx_set_msg_callback(ch->qrx, msg_callback, msg_callback_ssl);
4044 }
4045
ossl_quic_channel_set_msg_callback_arg(QUIC_CHANNEL * ch,void * msg_callback_arg)4046 void ossl_quic_channel_set_msg_callback_arg(QUIC_CHANNEL *ch,
4047 void *msg_callback_arg)
4048 {
4049 ch->msg_callback_arg = msg_callback_arg;
4050 ossl_qtx_set_msg_callback_arg(ch->qtx, msg_callback_arg);
4051 ossl_quic_tx_packetiser_set_msg_callback_arg(ch->txp, msg_callback_arg);
4052
4053 /*
4054 * postpone msg callback setting for tserver until port calls
4055 * port_bind_channel().
4056 */
4057 if (ch->is_tserver_ch == 0)
4058 ossl_qrx_set_msg_callback_arg(ch->qrx, msg_callback_arg);
4059 }
4060
ossl_quic_channel_set_txku_threshold_override(QUIC_CHANNEL * ch,uint64_t tx_pkt_threshold)4061 void ossl_quic_channel_set_txku_threshold_override(QUIC_CHANNEL *ch,
4062 uint64_t tx_pkt_threshold)
4063 {
4064 ch->txku_threshold_override = tx_pkt_threshold;
4065 }
4066
ossl_quic_channel_get_tx_key_epoch(QUIC_CHANNEL * ch)4067 uint64_t ossl_quic_channel_get_tx_key_epoch(QUIC_CHANNEL *ch)
4068 {
4069 return ossl_qtx_get_key_epoch(ch->qtx);
4070 }
4071
ossl_quic_channel_get_rx_key_epoch(QUIC_CHANNEL * ch)4072 uint64_t ossl_quic_channel_get_rx_key_epoch(QUIC_CHANNEL *ch)
4073 {
4074 return ossl_qrx_get_key_epoch(ch->qrx);
4075 }
4076
ossl_quic_channel_trigger_txku(QUIC_CHANNEL * ch)4077 int ossl_quic_channel_trigger_txku(QUIC_CHANNEL *ch)
4078 {
4079 if (!txku_allowed(ch))
4080 return 0;
4081
4082 ch->ku_locally_initiated = 1;
4083 ch_trigger_txku(ch);
4084 return 1;
4085 }
4086
ossl_quic_channel_ping(QUIC_CHANNEL * ch)4087 int ossl_quic_channel_ping(QUIC_CHANNEL *ch)
4088 {
4089 int pn_space = ossl_quic_enc_level_to_pn_space(ch->tx_enc_level);
4090
4091 ossl_quic_tx_packetiser_schedule_ack_eliciting(ch->txp, pn_space);
4092
4093 return 1;
4094 }
4095
ossl_quic_channel_get_diag_num_rx_ack(QUIC_CHANNEL * ch)4096 uint16_t ossl_quic_channel_get_diag_num_rx_ack(QUIC_CHANNEL *ch)
4097 {
4098 return ch->diag_num_rx_ack;
4099 }
4100
ossl_quic_channel_get_diag_local_cid(QUIC_CHANNEL * ch,QUIC_CONN_ID * cid)4101 void ossl_quic_channel_get_diag_local_cid(QUIC_CHANNEL *ch, QUIC_CONN_ID *cid)
4102 {
4103 *cid = ch->cur_local_cid;
4104 }
4105
ossl_quic_channel_have_generated_transport_params(const QUIC_CHANNEL * ch)4106 int ossl_quic_channel_have_generated_transport_params(const QUIC_CHANNEL *ch)
4107 {
4108 return ch->got_local_transport_params;
4109 }
4110
ossl_quic_channel_set_max_idle_timeout_request(QUIC_CHANNEL * ch,uint64_t ms)4111 void ossl_quic_channel_set_max_idle_timeout_request(QUIC_CHANNEL *ch, uint64_t ms)
4112 {
4113 ch->max_idle_timeout_local_req = ms;
4114 }
ossl_quic_channel_get_max_idle_timeout_request(const QUIC_CHANNEL * ch)4115 uint64_t ossl_quic_channel_get_max_idle_timeout_request(const QUIC_CHANNEL *ch)
4116 {
4117 return ch->max_idle_timeout_local_req;
4118 }
4119
ossl_quic_channel_get_max_idle_timeout_peer_request(const QUIC_CHANNEL * ch)4120 uint64_t ossl_quic_channel_get_max_idle_timeout_peer_request(const QUIC_CHANNEL *ch)
4121 {
4122 return ch->max_idle_timeout_remote_req;
4123 }
4124
ossl_quic_channel_get_max_idle_timeout_actual(const QUIC_CHANNEL * ch)4125 uint64_t ossl_quic_channel_get_max_idle_timeout_actual(const QUIC_CHANNEL *ch)
4126 {
4127 return ch->max_idle_timeout;
4128 }
4129