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- Log -----------------------------------------------------------------
commit d28d644b04743a3a6c1c889a67efa33a6f7b2156
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Mon Nov 16 15:21:32 2015 +0100
ntp: ignore poll in KoD RATE packets
The meaning of the poll value in KoD RATE packets is not currently
defined in the NTP specification (RFC 5905). In the reference NTP
implementation it signals the minimum acceptable polling interval to the
clients. In chrony the minimum poll is set to the KoD RATE poll if it's
larger, but not to a larger value than 10.
The problem is that ntpd as a server sets the KoD RATE poll to the
maximum of the client's poll and the configured rate limiting interval.
An attacker can send a burst of spoofed packets to the server to trigger
the client's request rate limit. When the client sends its next request
and the server responds with a KoD RATE packet, the client will set its
minimum poll to the current poll and it will no longer be able to switch
to a shorter poll when needed.
ntpd could be fixed to always set the KoD RATE poll to the rate limiting
interval. Unfortunately, ntpd as a client seems to depend on the current
behavior. It tries to follow the server poll and if the KoD RATE poll
was shorter than the current poll, the polling interval would be
reduced, defeating the purpose of KoD RATE. The server fix will probably
need to wait until clients are fixed and that could take a very long
time.
For now, ignore the poll value in KoD RATE packets. Just add an extra
delay based on the current poll to the next transmit timeout and stop an
ongoing burst.
commit a634fd3a2d087f83ced70cae12068e9afd4391e3
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Mon Nov 16 14:50:57 2015 +0100
doc: update description of offline command
Reachability and online/offline mode has no effect on source selection
since version 2.0.
commit 045794df4c1fb6ce582b300c0eb0d968fadd2eb5
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Mon Nov 16 12:28:42 2015 +0100
ntp: adjust initial delay for polling interval
First packet after setting a source to online was sent with constant
delay (0.2s). If the period in which the source was offline was shorter
than the current polling interval, the new packet was sent sooner than
it would be if the source wasn't switched to offline and back.
Don't reset the local tx timestamp when mode is changed. When starting
the initial transmit timeout, adjust the delay to make the interval
between the two packets at least as long as the current polling
interval.
commit dfc96e4702164a5daa0e8d554d419843b10f353c
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Fri Nov 13 16:08:02 2015 +0100
sched: update timeout randomization
Use UTI_GetRandomBytes() instead of random() to calculate the random
part of the timeout. This was the only remaining use of random() in the
code and the srandom() call can be removed.
commit 8225bf01f7eec88df8a6399767903bc342058ce6
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Tue Nov 10 17:59:49 2015 +0100
ntp: don't reveal local clock in client packets
In client packets set the leap, stratum, reference ID, reference time,
root delay and root dispersion to constant values to not reveal the
state of the synchronization. Use precision 32 to make the receive and
transmit timestamps completely random and not reveal the local time.
commit 116c6972827819bbff03a1bc32363f56bc8b9290
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Tue Nov 10 17:26:59 2015 +0100
util: rework timestamp fuzzing
Use UTI_GetRandomBytes() instead of random() to generate random bits
below precision. Save the result in NTP_int64 in the network order and
allow precision in the full range from -32 to 32. With precision 32
the fuzzing now makes the timestamp completely random and can be used to
hide the time.
commit 6199a89170273c507df58cec136040f8805ab799
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Tue Nov 10 16:46:40 2015 +0100
util: add function to generate random bytes
Add a function to fill a buffer with random bytes which uses a better
PRNG than random(). Use arc4random() if it's available on the system.
Fall back to reading from /dev/urandom, which should be available on
all currently supported systems.
commit cbd77c9752a9fc65e6fa885e3cf8def72cad09a1
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Thu Nov 5 16:43:40 2015 +0100
ntp: don't keep client sockets open for longer than necessary
After sending a client packet, schedule a timeout to close the socket
at the time when all server replies would fail the delay test, so the
socket is not open for longer than necessary (e.g. when the server is
unreachable). With the default maxdelay of 3 seconds the timeout is 7
seconds.
commit df9b5d8c22ece5bca2fea8ace79f177e6ac8d8e7
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Wed Nov 4 15:47:40 2015 +0100
ntp: check remote interval in client mode
For testA in the client mode require also that the time the server
needed to process the client request is not longer than 4 seconds.
With maximum peer delay this limits the interval in which the client can
accept a server reply.
commit 66d534417b2dc9960ec8d3cfee28afb01d885414
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Thu Nov 5 13:14:57 2015 +0100
sched: use shorter data type for timeout IDs
commit 8803ab27c628eed3e4205131a8dba77490e9ecbe
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Tue Nov 10 14:29:52 2015 +0100
sched: don't allow SCH_RemoveTimeout() with invalid non-zero ID
commit 38910424f28727e9c99dcf0430adb6545a53f474
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Tue Nov 10 14:41:19 2015 +0100
sched: don't return currently used timeout ID
To avoid problems in the very unlikely case where a timeout is so long
and new IDs are allocated so frequently that they would have a chance
to overflow and catch up with it, make sure before returning new ID that
it's currently not in use.
commit 0076458e9d03365d667db6ef6c797cccc8d443a9
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Thu Nov 5 14:29:11 2015 +0100
sched: always return non-zero timeout ID
Timeout ID of zero can be now safely used to indicate that the timer is
not running. Remove the extra timer_running variables that were
necessary to track that.
commit bdb1650ed81570e36238e9f09892525acf0a1373
Author: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Date: Wed Nov 4 14:53:00 2015 +0100
sys_linux: allow more syscalls in seccomp filter
These seem to be needed by getaddrinfo() in default NSS configuration
on recent Fedora.
-----------------------------------------------------------------------
Summary of changes:
chrony.texi.in | 12 +---
configure | 4 ++
ntp_core.c | 194 +++++++++++++++++++++++++++++++++-----------------------
reference.c | 26 +++-----
rtc_linux.c | 24 ++-----
sched.c | 39 ++++++++++--
sched.h | 3 +-
sys_generic.c | 17 ++---
sys_linux.c | 12 ++--
sys_macosx.c | 6 +-
util.c | 61 +++++++++++++-----
util.h | 9 ++-
12 files changed, 238 insertions(+), 169 deletions(-)
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