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BUG/MINOR: mux-quic: do not send too big MAX_STREAMS ID

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QUIC stream IDs are expressed as QUIC variable integer which cover the
range for 0 to 2^62 - 1. As such, it is forbidden to send an ID for
MAX_STREAMS flow-control frame which would allow to overcome this value.

This patch fixes MAX_STREAMS emission to ensure sent value is valid.
This also ensures that the peer cannot open a stream with an invalid ID
as this would cause a flow-control violation instead.

This must be backported up to 2.6.
This commit is contained in:
Amaury Denoyelle 2024-08-08 12:04:47 +02:00
parent aae2ff7691
commit f3c75a52df
1 changed files with 28 additions and 2 deletions
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30
src/mux_quic.c
View File

@ -15,6 +15,7 @@
#include <haproxy/qmux_http.h>
#include <haproxy/qmux_trace.h>
#include <haproxy/quic_conn.h>
#include <haproxy/quic_enc.h>
#include <haproxy/quic_fctl.h>
#include <haproxy/quic_frame.h>
#include <haproxy/quic_sock.h>
@ -684,6 +685,9 @@ static struct qcs *qcc_init_stream_remote(struct qcc *qcc, uint64_t id)
/* Only stream ID not already opened can be used. */
BUG_ON(id < *largest);
/* MAX_STREAMS emission must not allowed too big stream ID. */
BUG_ON(*largest > QUIC_VARINT_8_BYTE_MAX);
while (id >= *largest) {
const char *str = *largest < id ? "initializing intermediary remote stream" :
"initializing remote stream";
@ -1662,6 +1666,8 @@ int qcc_recv_stop_sending(struct qcc *qcc, uint64_t id, uint64_t err)
return 1;
}
#define QUIC_MAX_STREAMS_MAX_ID (1ULL<<60)
/* Signal the closing of remote stream with id <id>. Flow-control for new
* streams may be allocated for the peer if needed.
*/
@ -1672,8 +1678,28 @@ static int qcc_release_remote_stream(struct qcc *qcc, uint64_t id)
TRACE_ENTER(QMUX_EV_QCS_END, qcc->conn);
if (quic_stream_is_bidi(id)) {
/* RFC 9000 4.6. Controlling Concurrency
*
* If a max_streams transport parameter or a MAX_STREAMS frame is
* received with a value greater than 260, this would allow a maximum
* stream ID that cannot be expressed as a variable-length integer; see
* Section 16. If either is received, the connection MUST be closed
* immediately with a connection error of type TRANSPORT_PARAMETER_ERROR
* if the offending value was received in a transport parameter or of
* type FRAME_ENCODING_ERROR if it was received in a frame; see Section
* 10.2.
*/
if (qcc->lfctl.ms_bidi == QUIC_MAX_STREAMS_MAX_ID) {
TRACE_DATA("maximum streams value reached", QMUX_EV_QCC_SEND, qcc->conn);
goto out;
}
++qcc->lfctl.cl_bidi_r;
if (qcc->lfctl.cl_bidi_r > qcc->lfctl.ms_bidi_init / 2) {
/* MAX_STREAMS needed if closed streams value more than twice
* the initial window or reaching the stream ID limit.
*/
if (qcc->lfctl.cl_bidi_r > qcc->lfctl.ms_bidi_init / 2 ||
qcc->lfctl.cl_bidi_r + qcc->lfctl.ms_bidi == QUIC_MAX_STREAMS_MAX_ID) {
TRACE_DATA("increase max stream limit with MAX_STREAMS_BIDI", QMUX_EV_QCC_SEND, qcc->conn);
frm = qc_frm_alloc(QUIC_FT_MAX_STREAMS_BIDI);
if (!frm) {
@ -1698,8 +1724,8 @@ static int qcc_release_remote_stream(struct qcc *qcc, uint64_t id)
*/
}
out:
TRACE_LEAVE(QMUX_EV_QCS_END, qcc->conn);
return 0;
err: