2 * Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include <openssl/macros.h>
11 #include <openssl/objects.h>
12 #include <openssl/sslerr.h>
13 #include <crypto/rand.h>
14 #include "quic_local.h"
15 #include "internal/quic_tls.h"
16 #include "internal/quic_rx_depack.h"
17 #include "internal/quic_error.h"
18 #include "internal/time.h"
20 static void aon_write_finish(QUIC_CONNECTION *qc);
23 * QUIC Front-End I/O API: Common Utilities
24 * ========================================
28 * Block until a predicate is met.
30 * Precondition: Must have a channel.
32 static int block_until_pred(QUIC_CONNECTION *qc,
33 int (*pred)(void *arg), void *pred_arg,
38 assert(qc->ch != NULL);
40 rtor = ossl_quic_channel_get_reactor(qc->ch);
41 return ossl_quic_reactor_block_until_pred(rtor, pred, pred_arg, flags);
45 * Raise a 'normal' error, meaning one that can be reported via SSL_get_error()
46 * rather than via ERR.
48 static int quic_raise_normal_error(QUIC_CONNECTION *qc,
56 * Raise a 'non-normal' error, meaning any error that is not reported via
57 * SSL_get_error() and must be reported via ERR.
59 static int quic_raise_non_normal_error(QUIC_CONNECTION *qc,
70 ERR_set_debug(file, line, func);
73 ERR_vset_error(ERR_LIB_SSL, reason, fmt, args);
76 qc->last_error = SSL_ERROR_SSL;
80 #define QUIC_RAISE_NORMAL_ERROR(qc, err) \
81 quic_raise_normal_error((qc), (err))
83 #define QUIC_RAISE_NON_NORMAL_ERROR(qc, reason, msg) \
84 quic_raise_non_normal_error((qc), \
85 OPENSSL_FILE, OPENSSL_LINE, \
91 * Should be called at entry of every public function to confirm we have a valid
94 static ossl_inline int expect_quic_conn(const QUIC_CONNECTION *qc)
96 if (!ossl_assert(qc != NULL))
97 return QUIC_RAISE_NON_NORMAL_ERROR(NULL, ERR_R_INTERNAL_ERROR, NULL);
104 * QUIC Front-End I/O API: Initialization
105 * ======================================
107 * SSL_new => ossl_quic_new
109 * SSL_reset => ossl_quic_reset
110 * SSL_clear => ossl_quic_clear
112 * SSL_free => ossl_quic_free
117 SSL *ossl_quic_new(SSL_CTX *ctx)
119 QUIC_CONNECTION *qc = NULL;
120 SSL *ssl_base = NULL;
121 SSL_CONNECTION *sc = NULL;
123 qc = OPENSSL_zalloc(sizeof(*qc));
127 /* Initialise the QUIC_CONNECTION's stub header. */
129 if (!ossl_ssl_init(ssl_base, ctx, ctx->method, SSL_TYPE_QUIC_CONNECTION)) {
134 qc->tls = ossl_ssl_connection_new_int(ctx, TLS_method());
135 if (qc->tls == NULL || (sc = SSL_CONNECTION_FROM_SSL(qc->tls)) == NULL)
138 /* Channel is not created yet. */
139 qc->ssl_mode = qc->ssl.ctx->mode;
140 qc->last_error = SSL_ERROR_NONE;
151 void ossl_quic_free(SSL *s)
153 QUIC_CONNECTION *qc = QUIC_CONNECTION_FROM_SSL(s);
155 /* We should never be called on anything but a QUIC_CONNECTION. */
156 if (!expect_quic_conn(qc))
159 ossl_quic_channel_free(qc->ch);
161 BIO_free(qc->net_rbio);
162 BIO_free(qc->net_wbio);
164 /* Note: SSL_free calls OPENSSL_free(qc) for us */
169 /* SSL method init */
170 int ossl_quic_init(SSL *s)
172 QUIC_CONNECTION *qc = QUIC_CONNECTION_FROM_SSL(s);
174 if (!expect_quic_conn(qc))
177 /* Same op as SSL_clear, forward the call. */
178 return ossl_quic_clear(s);
181 /* SSL method deinit */
182 void ossl_quic_deinit(SSL *s)
188 int ossl_quic_reset(SSL *s)
190 QUIC_CONNECTION *qc = QUIC_CONNECTION_FROM_SSL(s);
192 if (!expect_quic_conn(qc))
195 /* TODO(QUIC); Currently a no-op. */
200 int ossl_quic_clear(SSL *s)
202 QUIC_CONNECTION *qc = QUIC_CONNECTION_FROM_SSL(s);
204 if (!expect_quic_conn(qc))
207 /* TODO(QUIC): Currently a no-op. */
212 * QUIC Front-End I/O API: Network BIO Configuration
213 * =================================================
215 * Handling the different BIOs is difficult:
217 * - It is more or less a requirement that we use non-blocking network I/O;
218 * we need to be able to have timeouts on recv() calls, and make best effort
219 * (non blocking) send() and recv() calls.
221 * The only sensible way to do this is to configure the socket into
222 * non-blocking mode. We could try to do select() before calling send() or
223 * recv() to get a guarantee that the call will not block, but this will
224 * probably run into issues with buggy OSes which generate spurious socket
225 * readiness events. In any case, relying on this to work reliably does not
228 * Timeouts could be handled via setsockopt() socket timeout options, but
229 * this depends on OS support and adds another syscall to every network I/O
230 * operation. It also has obvious thread safety concerns if we want to move
231 * to concurrent use of a single socket at some later date.
233 * Some OSes support a MSG_DONTWAIT flag which allows a single I/O option to
234 * be made non-blocking. However some OSes (e.g. Windows) do not support
235 * this, so we cannot rely on this.
237 * As such, we need to configure any FD in non-blocking mode. This may
238 * confound users who pass a blocking socket to libssl. However, in practice
239 * it would be extremely strange for a user of QUIC to pass an FD to us,
240 * then also try and send receive traffic on the same socket(!). Thus the
241 * impact of this should be limited, and can be documented.
243 * - We support both blocking and non-blocking operation in terms of the API
244 * presented to the user. One prospect is to set the blocking mode based on
245 * whether the socket passed to us was already in blocking mode. However,
246 * Windows has no API for determining if a socket is in blocking mode (!),
247 * therefore this cannot be done portably. Currently therefore we expose an
248 * explicit API call to set this, and default to blocking mode.
250 * - We need to determine our initial destination UDP address. The "natural"
251 * way for a user to do this is to set the peer variable on a BIO_dgram.
252 * However, this has problems because BIO_dgram's peer variable is used for
253 * both transmission and reception. This means it can be constantly being
254 * changed to a malicious value (e.g. if some random unrelated entity on the
255 * network starts sending traffic to us) on every read call. This is not a
256 * direct issue because we use the 'stateless' BIO_sendmmsg and BIO_recvmmsg
257 * calls only, which do not use this variable. However, we do need to let
258 * the user specify the peer in a 'normal' manner. The compromise here is
259 * that we grab the current peer value set at the time the write BIO is set
260 * and do not read the value again.
262 * - We also need to support memory BIOs (e.g. BIO_dgram_pair) or custom BIOs.
263 * Currently we do this by only supporting non-blocking mode.
268 * Determines what initial destination UDP address we should use, if possible.
269 * If this fails the client must set the destination address manually, or use a
270 * BIO which does not need a destination address.
272 static int csm_analyse_init_peer_addr(BIO *net_wbio, BIO_ADDR *peer)
274 if (BIO_dgram_get_peer(net_wbio, peer) <= 0)
280 void ossl_quic_conn_set0_net_rbio(QUIC_CONNECTION *qc, BIO *net_rbio)
282 if (qc->net_rbio == net_rbio)
285 if (qc->ch != NULL && !ossl_quic_channel_set_net_rbio(qc->ch, net_rbio))
288 BIO_free(qc->net_rbio);
289 qc->net_rbio = net_rbio;
292 * If what we have is not pollable (e.g. a BIO_dgram_pair) disable blocking
293 * mode as we do not support it for non-pollable BIOs.
295 if (net_rbio != NULL) {
296 BIO_POLL_DESCRIPTOR d = {0};
298 if (!BIO_get_rpoll_descriptor(net_rbio, &d)
299 || d.type != BIO_POLL_DESCRIPTOR_TYPE_SOCK_FD) {
301 qc->can_poll_net_rbio = 0;
303 qc->can_poll_net_rbio = 1;
308 void ossl_quic_conn_set0_net_wbio(QUIC_CONNECTION *qc, BIO *net_wbio)
310 if (qc->net_wbio == net_wbio)
313 if (qc->ch != NULL && !ossl_quic_channel_set_net_wbio(qc->ch, net_wbio))
316 BIO_free(qc->net_wbio);
317 qc->net_wbio = net_wbio;
319 if (net_wbio != NULL) {
320 BIO_POLL_DESCRIPTOR d = {0};
322 if (!BIO_get_wpoll_descriptor(net_wbio, &d)
323 || d.type != BIO_POLL_DESCRIPTOR_TYPE_SOCK_FD) {
325 qc->can_poll_net_wbio = 0;
327 qc->can_poll_net_wbio = 1;
331 * If we do not have a peer address yet, and we have not started trying
332 * to connect yet, try to autodetect one.
334 if (BIO_ADDR_family(&qc->init_peer_addr) == AF_UNSPEC
336 if (!csm_analyse_init_peer_addr(net_wbio, &qc->init_peer_addr))
338 BIO_ADDR_clear(&qc->init_peer_addr);
341 ossl_quic_channel_set_peer_addr(qc->ch, &qc->init_peer_addr);
346 BIO *ossl_quic_conn_get_net_rbio(const QUIC_CONNECTION *qc)
351 BIO *ossl_quic_conn_get_net_wbio(const QUIC_CONNECTION *qc)
356 int ossl_quic_conn_get_blocking_mode(const QUIC_CONNECTION *qc)
361 int ossl_quic_conn_set_blocking_mode(QUIC_CONNECTION *qc, int blocking)
363 /* Cannot enable blocking mode if we do not have pollable FDs. */
365 (!qc->can_poll_net_rbio || !qc->can_poll_net_wbio))
366 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_UNSUPPORTED, NULL);
368 qc->blocking = (blocking != 0);
372 int ossl_quic_conn_set_initial_peer_addr(QUIC_CONNECTION *qc,
373 const BIO_ADDR *peer_addr)
376 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,
379 if (peer_addr == NULL) {
380 BIO_ADDR_clear(&qc->init_peer_addr);
384 qc->init_peer_addr = *peer_addr;
389 * QUIC Front-End I/O API: Asynchronous I/O Management
390 * ===================================================
392 * (BIO/)SSL_tick => ossl_quic_tick
393 * (BIO/)SSL_get_tick_timeout => ossl_quic_get_tick_timeout
394 * (BIO/)SSL_get_poll_fd => ossl_quic_get_poll_fd
398 /* Returns 1 if the connection is being used in blocking mode. */
399 static int blocking_mode(const QUIC_CONNECTION *qc)
404 /* SSL_tick; ticks the reactor. */
405 int ossl_quic_tick(QUIC_CONNECTION *qc)
410 ossl_quic_reactor_tick(ossl_quic_channel_get_reactor(qc->ch));
415 * SSL_get_tick_timeout. Get the time in milliseconds until the SSL object
416 * should be ticked by the application by calling SSL_tick(). tv is set to 0 if
417 * the object should be ticked immediately and tv->tv_sec is set to -1 if no
418 * timeout is currently active.
420 int ossl_quic_get_tick_timeout(QUIC_CONNECTION *qc, struct timeval *tv)
422 OSSL_TIME deadline = ossl_time_infinite();
426 = ossl_quic_reactor_get_tick_deadline(ossl_quic_channel_get_reactor(qc->ch));
428 if (ossl_time_is_infinite(deadline)) {
434 *tv = ossl_time_to_timeval(ossl_time_subtract(deadline, ossl_time_now()));
438 /* SSL_get_rpoll_descriptor */
439 int ossl_quic_get_rpoll_descriptor(QUIC_CONNECTION *qc, BIO_POLL_DESCRIPTOR *desc)
441 if (desc == NULL || qc->net_rbio == NULL)
444 return BIO_get_rpoll_descriptor(qc->net_rbio, desc);
447 /* SSL_get_wpoll_descriptor */
448 int ossl_quic_get_wpoll_descriptor(QUIC_CONNECTION *qc, BIO_POLL_DESCRIPTOR *desc)
450 if (desc == NULL || qc->net_wbio == NULL)
453 return BIO_get_wpoll_descriptor(qc->net_wbio, desc);
456 /* SSL_net_read_desired */
457 int ossl_quic_get_net_read_desired(QUIC_CONNECTION *qc)
462 return ossl_quic_reactor_net_read_desired(ossl_quic_channel_get_reactor(qc->ch));
465 /* SSL_net_write_desired */
466 int ossl_quic_get_net_write_desired(QUIC_CONNECTION *qc)
471 return ossl_quic_reactor_net_write_desired(ossl_quic_channel_get_reactor(qc->ch));
475 * QUIC Front-End I/O API: Connection Lifecycle Operations
476 * =======================================================
478 * SSL_do_handshake => ossl_quic_do_handshake
479 * SSL_set_connect_state => ossl_quic_set_connect_state
480 * SSL_set_accept_state => ossl_quic_set_accept_state
481 * SSL_shutdown => ossl_quic_shutdown
482 * SSL_ctrl => ossl_quic_ctrl
483 * (BIO/)SSL_connect => ossl_quic_connect
484 * (BIO/)SSL_accept => ossl_quic_accept
489 int ossl_quic_shutdown(SSL *s)
491 QUIC_CONNECTION *qc = QUIC_CONNECTION_FROM_SSL(s);
493 if (!expect_quic_conn(qc))
497 ossl_quic_channel_local_close(qc->ch);
503 long ossl_quic_ctrl(SSL *s, int cmd, long larg, void *parg)
505 QUIC_CONNECTION *qc = QUIC_CONNECTION_FROM_SSL(s);
507 if (!expect_quic_conn(qc))
512 /* Cannot enable EPW while AON write in progress. */
513 if (qc->aon_write_in_progress)
514 larg &= ~SSL_MODE_ENABLE_PARTIAL_WRITE;
516 qc->ssl_mode |= (uint32_t)larg;
518 case SSL_CTRL_CLEAR_MODE:
519 qc->ssl_mode &= ~(uint32_t)larg;
526 /* SSL_set_connect_state */
527 void ossl_quic_set_connect_state(QUIC_CONNECTION *qc)
529 /* Cannot be changed after handshake started */
536 /* SSL_set_accept_state */
537 void ossl_quic_set_accept_state(QUIC_CONNECTION *qc)
539 /* Cannot be changed after handshake started */
546 /* SSL_do_handshake */
547 struct quic_handshake_wait_args {
551 static int quic_handshake_wait(void *arg)
553 struct quic_handshake_wait_args *args = arg;
555 if (!ossl_quic_channel_is_active(args->qc->ch))
558 if (ossl_quic_channel_is_handshake_complete(args->qc->ch))
564 static int configure_channel(QUIC_CONNECTION *qc)
566 assert(qc->ch != NULL);
568 if (!ossl_quic_channel_set_net_rbio(qc->ch, qc->net_rbio)
569 || !ossl_quic_channel_set_net_wbio(qc->ch, qc->net_wbio)
570 || !ossl_quic_channel_set_peer_addr(qc->ch, &qc->init_peer_addr))
577 * Creates a channel and configures it with the information we have accumulated
578 * via calls made to us from the application prior to starting a handshake
581 static int ensure_channel_and_start(QUIC_CONNECTION *qc)
583 QUIC_CHANNEL_ARGS args = {0};
588 args.libctx = qc->ssl.ctx->libctx;
589 args.propq = qc->ssl.ctx->propq;
593 qc->ch = ossl_quic_channel_new(&args);
597 if (!configure_channel(qc)
598 || !ossl_quic_channel_start(qc->ch)) {
599 ossl_quic_channel_free(qc->ch);
604 qc->stream0 = ossl_quic_channel_get_stream_by_id(qc->ch, 0);
605 if (qc->stream0 == NULL) {
606 ossl_quic_channel_free(qc->ch);
615 int ossl_quic_do_handshake(QUIC_CONNECTION *qc)
619 if (qc->ch != NULL && ossl_quic_channel_is_handshake_complete(qc->ch))
620 /* Handshake already completed. */
623 if (qc->ch != NULL && ossl_quic_channel_is_term_any(qc->ch))
624 return QUIC_RAISE_NON_NORMAL_ERROR(qc, SSL_R_PROTOCOL_IS_SHUTDOWN, NULL);
626 if (BIO_ADDR_family(&qc->init_peer_addr) == AF_UNSPEC) {
627 /* Peer address must have been set. */
628 QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_PASSED_INVALID_ARGUMENT, NULL);
629 return -1; /* Non-protocol error */
633 /* TODO(QUIC): Server mode not currently supported */
634 QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_PASSED_INVALID_ARGUMENT, NULL);
635 return -1; /* Non-protocol error */
638 if (qc->net_rbio == NULL || qc->net_wbio == NULL) {
639 /* Need read and write BIOs. */
640 QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_PASSED_INVALID_ARGUMENT, NULL);
641 return -1; /* Non-protocol error */
645 * Start connection process. Note we may come here multiple times in
646 * non-blocking mode, which is fine.
648 if (!ensure_channel_and_start(qc)) {
649 QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
650 return -1; /* Non-protocol error */
653 if (ossl_quic_channel_is_handshake_complete(qc->ch))
654 /* The handshake is now done. */
657 if (blocking_mode(qc)) {
658 /* In blocking mode, wait for the handshake to complete. */
659 struct quic_handshake_wait_args args;
663 ret = block_until_pred(qc, quic_handshake_wait, &args, 0);
664 if (!ossl_quic_channel_is_active(qc->ch)) {
665 QUIC_RAISE_NON_NORMAL_ERROR(qc, SSL_R_PROTOCOL_IS_SHUTDOWN, NULL);
666 return 0; /* Shutdown before completion */
667 } else if (ret <= 0) {
668 QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
669 return -1; /* Non-protocol error */
672 assert(ossl_quic_channel_is_handshake_complete(qc->ch));
675 /* Try to advance the reactor. */
676 ossl_quic_reactor_tick(ossl_quic_channel_get_reactor(qc->ch));
678 if (ossl_quic_channel_is_handshake_complete(qc->ch))
679 /* The handshake is now done. */
682 /* Otherwise, indicate that the handshake isn't done yet. */
683 QUIC_RAISE_NORMAL_ERROR(qc, SSL_ERROR_WANT_READ);
684 return -1; /* Non-protocol error */
689 int ossl_quic_connect(SSL *s)
691 QUIC_CONNECTION *qc = QUIC_CONNECTION_FROM_SSL(s);
693 if (!expect_quic_conn(qc))
696 /* Ensure we are in connect state (no-op if non-idle). */
697 ossl_quic_set_connect_state(qc);
699 /* Begin or continue the handshake */
700 return ossl_quic_do_handshake(qc);
704 int ossl_quic_accept(SSL *s)
706 QUIC_CONNECTION *qc = QUIC_CONNECTION_FROM_SSL(s);
708 if (!expect_quic_conn(qc))
711 /* Ensure we are in accept state (no-op if non-idle). */
712 ossl_quic_set_accept_state(qc);
714 /* Begin or continue the handshake */
715 return ossl_quic_do_handshake(qc);
719 * QUIC Front-End I/O API: Steady-State Operations
720 * ===============================================
722 * Here we dispatch calls to the steady-state front-end I/O API functions; that
723 * is, the functions used during the established phase of a QUIC connection
724 * (e.g. SSL_read, SSL_write).
726 * Each function must handle both blocking and non-blocking modes. As discussed
727 * above, all QUIC I/O is implemented using non-blocking mode internally.
729 * SSL_get_error => partially implemented by ossl_quic_get_error
730 * (BIO/)SSL_read => ossl_quic_read
731 * (BIO/)SSL_write => ossl_quic_write
732 * SSL_pending => ossl_quic_pending
736 int ossl_quic_get_error(const QUIC_CONNECTION *qc, int i)
738 return qc->last_error;
745 * The set of functions below provide the implementation of the public SSL_write
746 * function. We must handle:
748 * - both blocking and non-blocking operation at the application level,
749 * depending on how we are configured;
751 * - SSL_MODE_ENABLE_PARTIAL_WRITE being on or off;
753 * - SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER.
756 static void quic_post_write(QUIC_CONNECTION *qc, int did_append, int do_tick)
759 * We have appended at least one byte to the stream.
760 * Potentially mark stream as active, depending on FC.
763 ossl_quic_stream_map_update_state(ossl_quic_channel_get_qsm(qc->ch),
769 * TODO(QUIC): It is probably inefficient to try and do this immediately,
770 * plus we should eventually consider Nagle's algorithm.
773 ossl_quic_reactor_tick(ossl_quic_channel_get_reactor(qc->ch));
776 struct quic_write_again_args {
778 const unsigned char *buf;
780 size_t total_written;
783 static int quic_write_again(void *arg)
785 struct quic_write_again_args *args = arg;
786 size_t actual_written = 0;
788 if (!ossl_quic_channel_is_active(args->qc->ch))
789 /* If connection is torn down due to an error while blocking, stop. */
792 if (!ossl_quic_sstream_append(args->qc->stream0->sstream,
793 args->buf, args->len, &actual_written))
796 quic_post_write(args->qc, actual_written > 0, 0);
798 args->buf += actual_written;
799 args->len -= actual_written;
800 args->total_written += actual_written;
803 /* Written everything, done. */
806 /* Not written everything yet, keep trying. */
810 static int quic_write_blocking(QUIC_CONNECTION *qc, const void *buf, size_t len,
814 struct quic_write_again_args args;
815 size_t actual_written = 0;
817 /* First make a best effort to append as much of the data as possible. */
818 if (!ossl_quic_sstream_append(qc->stream0->sstream, buf, len,
820 /* Stream already finished or allocation error. */
822 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
825 quic_post_write(qc, actual_written > 0, 1);
827 if (actual_written == len) {
828 /* Managed to append everything on the first try. */
829 *written = actual_written;
834 * We did not manage to append all of the data immediately, so the stream
835 * buffer has probably filled up. This means we need to block until some of
839 args.buf = (const unsigned char *)buf + actual_written;
840 args.len = len - actual_written;
841 args.total_written = 0;
843 res = block_until_pred(qc, quic_write_again, &args, 0);
845 if (!ossl_quic_channel_is_active(qc->ch))
846 return QUIC_RAISE_NON_NORMAL_ERROR(qc, SSL_R_PROTOCOL_IS_SHUTDOWN, NULL);
848 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
851 *written = args.total_written;
856 * Functions to manage All-or-Nothing (AON) (that is, non-ENABLE_PARTIAL_WRITE)
859 static void aon_write_begin(QUIC_CONNECTION *qc, const unsigned char *buf,
860 size_t buf_len, size_t already_sent)
862 assert(!qc->aon_write_in_progress);
864 qc->aon_write_in_progress = 1;
865 qc->aon_buf_base = buf;
866 qc->aon_buf_pos = already_sent;
867 qc->aon_buf_len = buf_len;
870 static void aon_write_finish(QUIC_CONNECTION *qc)
872 qc->aon_write_in_progress = 0;
873 qc->aon_buf_base = NULL;
878 static int quic_write_nonblocking_aon(QUIC_CONNECTION *qc, const void *buf,
879 size_t len, size_t *written)
881 const void *actual_buf;
882 size_t actual_len, actual_written = 0;
883 int accept_moving_buffer
884 = ((qc->ssl_mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER) != 0);
886 if (qc->aon_write_in_progress) {
888 * We are in the middle of an AON write (i.e., a previous write did not
889 * manage to append all data to the SSTREAM and we have Enable Partial
890 * Write (EPW) mode disabled.)
892 if ((!accept_moving_buffer && qc->aon_buf_base != buf)
893 || len != qc->aon_buf_len)
895 * Pointer must not have changed if we are not in accept moving
896 * buffer mode. Length must never change.
898 return QUIC_RAISE_NON_NORMAL_ERROR(qc, SSL_R_BAD_WRITE_RETRY, NULL);
900 actual_buf = (unsigned char *)buf + qc->aon_buf_pos;
901 actual_len = len - qc->aon_buf_pos;
902 assert(actual_len > 0);
908 /* First make a best effort to append as much of the data as possible. */
909 if (!ossl_quic_sstream_append(qc->stream0->sstream, actual_buf, actual_len,
911 /* Stream already finished or allocation error. */
913 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
916 quic_post_write(qc, actual_written > 0, 1);
918 if (actual_written == actual_len) {
919 /* We have sent everything. */
920 if (qc->aon_write_in_progress) {
922 * We have sent everything, and we were in the middle of an AON
923 * write. The output write length is the total length of the AON
924 * buffer, not however many bytes we managed to write to the stream
927 *written = qc->aon_buf_len;
928 aon_write_finish(qc);
930 *written = actual_written;
936 if (qc->aon_write_in_progress) {
938 * AON write is in progress but we have not written everything yet. We
939 * may have managed to send zero bytes, or some number of bytes less
940 * than the total remaining which need to be appended during this
943 qc->aon_buf_pos += actual_written;
944 assert(qc->aon_buf_pos < qc->aon_buf_len);
945 return QUIC_RAISE_NORMAL_ERROR(qc, SSL_ERROR_WANT_WRITE);
949 * Not in an existing AON operation but partial write is not enabled, so we
950 * need to begin a new AON operation. However we needn't bother if we didn't
951 * actually append anything.
953 if (actual_written > 0)
954 aon_write_begin(qc, buf, len, actual_written);
957 * AON - We do not publicly admit to having appended anything until AON
961 return QUIC_RAISE_NORMAL_ERROR(qc, SSL_ERROR_WANT_WRITE);
964 static int quic_write_nonblocking_epw(QUIC_CONNECTION *qc, const void *buf, size_t len,
967 /* Simple best effort operation. */
968 if (!ossl_quic_sstream_append(qc->stream0->sstream, buf, len, written)) {
969 /* Stream already finished or allocation error. */
971 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
974 quic_post_write(qc, *written > 0, 1);
978 int ossl_quic_write(SSL *s, const void *buf, size_t len, size_t *written)
980 QUIC_CONNECTION *qc = QUIC_CONNECTION_FROM_SSL(s);
981 int partial_write = ((qc->ssl_mode & SSL_MODE_ENABLE_PARTIAL_WRITE) != 0);
985 if (!expect_quic_conn(qc))
988 if (qc->ch != NULL && ossl_quic_channel_is_term_any(qc->ch))
989 return QUIC_RAISE_NON_NORMAL_ERROR(qc, SSL_R_PROTOCOL_IS_SHUTDOWN, NULL);
992 * If we haven't finished the handshake, try to advance it.
993 * We don't accept writes until the handshake is completed.
995 if (ossl_quic_do_handshake(qc) < 1)
998 if (qc->stream0 == NULL || qc->stream0->sstream == NULL)
999 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
1001 if (blocking_mode(qc))
1002 return quic_write_blocking(qc, buf, len, written);
1003 else if (partial_write)
1004 return quic_write_nonblocking_epw(qc, buf, len, written);
1006 return quic_write_nonblocking_aon(qc, buf, len, written);
1013 struct quic_read_again_args {
1014 QUIC_CONNECTION *qc;
1015 QUIC_STREAM *stream;
1022 static int quic_read_actual(QUIC_CONNECTION *qc,
1023 QUIC_STREAM *stream,
1024 void *buf, size_t buf_len,
1030 if (stream->rstream == NULL)
1031 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
1034 if (!ossl_quic_rstream_peek(stream->rstream, buf, buf_len,
1035 bytes_read, &is_fin))
1036 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
1039 if (!ossl_quic_rstream_read(stream->rstream, buf, buf_len,
1040 bytes_read, &is_fin))
1041 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
1045 if (*bytes_read > 0) {
1047 * We have read at least one byte from the stream. Inform stream-level
1048 * RXFC of the retirement of controlled bytes. Update the active stream
1049 * status (the RXFC may now want to emit a frame granting more credit to
1052 OSSL_RTT_INFO rtt_info;
1054 ossl_statm_get_rtt_info(ossl_quic_channel_get_statm(qc->ch), &rtt_info);
1056 if (!ossl_quic_rxfc_on_retire(&qc->stream0->rxfc, *bytes_read,
1057 rtt_info.smoothed_rtt))
1058 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
1062 stream->recv_fin_retired = 1;
1064 if (*bytes_read > 0)
1065 ossl_quic_stream_map_update_state(ossl_quic_channel_get_qsm(qc->ch),
1072 static int quic_read_again(void *arg)
1074 struct quic_read_again_args *args = arg;
1076 if (!ossl_quic_channel_is_active(args->qc->ch))
1077 /* If connection is torn down due to an error while blocking, stop. */
1080 if (!quic_read_actual(args->qc, args->stream,
1081 args->buf, args->len, args->bytes_read,
1085 if (*args->bytes_read > 0)
1086 /* got at least one byte, the SSL_read op can finish now */
1089 return 0; /* did not read anything, keep trying */
1092 static int quic_read(SSL *s, void *buf, size_t len, size_t *bytes_read, int peek)
1095 QUIC_CONNECTION *qc = QUIC_CONNECTION_FROM_SSL(s);
1096 struct quic_read_again_args args;
1100 if (!expect_quic_conn(qc))
1103 if (qc->ch != NULL && ossl_quic_channel_is_term_any(qc->ch))
1104 return QUIC_RAISE_NON_NORMAL_ERROR(qc, SSL_R_PROTOCOL_IS_SHUTDOWN, NULL);
1106 /* If we haven't finished the handshake, try to advance it.*/
1107 if (ossl_quic_do_handshake(qc) < 1)
1110 if (qc->stream0 == NULL)
1111 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
1113 if (!quic_read_actual(qc, qc->stream0, buf, len, bytes_read, peek))
1116 if (*bytes_read > 0) {
1118 * Even though we succeeded, tick the reactor here to ensure we are
1119 * handling other aspects of the QUIC connection.
1121 ossl_quic_reactor_tick(ossl_quic_channel_get_reactor(qc->ch));
1123 } else if (blocking_mode(qc)) {
1125 * We were not able to read anything immediately, so our stream
1126 * buffer is empty. This means we need to block until we get
1127 * at least one byte.
1130 args.stream = qc->stream0;
1133 args.bytes_read = bytes_read;
1136 res = block_until_pred(qc, quic_read_again, &args, 0);
1138 if (!ossl_quic_channel_is_active(qc->ch))
1139 return QUIC_RAISE_NON_NORMAL_ERROR(qc, SSL_R_PROTOCOL_IS_SHUTDOWN, NULL);
1141 return QUIC_RAISE_NON_NORMAL_ERROR(qc, ERR_R_INTERNAL_ERROR, NULL);
1146 /* We did not get any bytes and are not in blocking mode. */
1147 return QUIC_RAISE_NORMAL_ERROR(qc, SSL_ERROR_WANT_READ);
1151 int ossl_quic_read(SSL *s, void *buf, size_t len, size_t *bytes_read)
1153 return quic_read(s, buf, len, bytes_read, 0);
1156 int ossl_quic_peek(SSL *s, void *buf, size_t len, size_t *bytes_read)
1158 return quic_read(s, buf, len, bytes_read, 1);
1165 size_t ossl_quic_pending(const SSL *s)
1167 const QUIC_CONNECTION *qc = QUIC_CONNECTION_FROM_CONST_SSL(s);
1171 if (!expect_quic_conn(qc))
1174 if (qc->stream0 == NULL || qc->stream0->rstream == NULL)
1175 /* Cannot raise errors here because we are const, just fail. */
1178 if (!ossl_quic_rstream_available(qc->stream0->rstream, &avail, &fin))
1185 * QUIC Front-End I/O API: SSL_CTX Management
1186 * ==========================================
1189 long ossl_quic_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
1193 return ssl3_ctx_ctrl(ctx, cmd, larg, parg);
1197 long ossl_quic_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
1199 return ssl3_callback_ctrl(s, cmd, fp);
1202 long ossl_quic_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
1204 return ssl3_ctx_callback_ctrl(ctx, cmd, fp);
1207 int ossl_quic_renegotiate_check(SSL *ssl, int initok)
1209 /* We never do renegotiation. */
1214 * This is the subset of TLS1.3 ciphers which can be used with QUIC and which we
1217 * TODO(QUIC): CCM support
1219 static SSL_CIPHER tls13_quic_ciphers[] = {
1222 TLS1_3_RFC_AES_128_GCM_SHA256,
1223 TLS1_3_RFC_AES_128_GCM_SHA256,
1224 TLS1_3_CK_AES_128_GCM_SHA256,
1229 TLS1_3_VERSION, TLS1_3_VERSION,
1232 SSL_HANDSHAKE_MAC_SHA256,
1237 TLS1_3_RFC_AES_256_GCM_SHA384,
1238 TLS1_3_RFC_AES_256_GCM_SHA384,
1239 TLS1_3_CK_AES_256_GCM_SHA384,
1244 TLS1_3_VERSION, TLS1_3_VERSION,
1247 SSL_HANDSHAKE_MAC_SHA384,
1253 TLS1_3_RFC_CHACHA20_POLY1305_SHA256,
1254 TLS1_3_RFC_CHACHA20_POLY1305_SHA256,
1255 TLS1_3_CK_CHACHA20_POLY1305_SHA256,
1258 SSL_CHACHA20POLY1305,
1260 TLS1_3_VERSION, TLS1_3_VERSION,
1263 SSL_HANDSHAKE_MAC_SHA256,
1269 int ossl_quic_num_ciphers(void)
1271 return OSSL_NELEM(tls13_quic_ciphers);
1274 const SSL_CIPHER *ossl_quic_get_cipher(unsigned int u)
1276 if (u >= OSSL_NELEM(tls13_quic_ciphers))
1279 return &tls13_quic_ciphers[u];