Show untrusted sources with the '?' symbol instead of '-' to make them
consistent with not selectable and selectable sources in the selectdata
description.
Log an error message when SCK_OpenTcpSocket() fails in the NTS-KE
client, e.g. when connect() fails due to the port not being allowed in
the SELinux policy.
Before sending a cmdmon response, make sure it is not longer than the
request to avoid amplification in case the response/padding length is
incorrectly specified for a request.
Make the precision of the system clock configurable. This can be useful
on servers using hardware timestamping to reduce the amount of noise
added to the NTP timestamps and improve stability of NTP measurements.
These syscalls seem to be needed when gnutls is loading system trusted
certificates due to p11-kit >= 0.23.21 getting the program name from
/proc/self/exe.
On macOS 11.0 (Big Sur) beta, ntp_adjtime() incorrectly returns
timex.freq as an unsigned number. This patch is a workaround for the bug
and should be removed when Apple fix the problem (assuming they will).
When opening a file for appending (i.e. a log file), use the O_NOFOLLOW
flag to get an error if the path is a symlink. Opening log files through
symlinks is no longer supported.
This is a protection against symlink attacks if chronyd is misconfigured
to write a log in a world-writable directory (e.g. /tmp). That is not
meant to become a recommended practice. Log messages will be lost, or
chronyd won't start, if a symlink exists at the location of the log
file.
Session tickets should never be enabled with the currect code on both
clients and servers. Set the GNUTLS_NO_TICKETS flag when opening a TLS
session in case this understanding is wrong, or it changes in future, to
reduce the TLS attack surface.
The directive sets the DSCP value in transmitted NTP packets, which can
be useful in local networks where switches/routers are configured to
prioritise packets with specific DSCP values.
Before generating a MAC, make sure there is enough space in the packet.
This is always true with the current code, but it may change when a
non-NTS extension field is supported.
Update the packet auth info after generating a MAC in case it's needed
before the transmission.
Add more assertions and make other changes for better readability.
It seems gnutls (at least in version 3.6.14) allows clients to connect
using TLS1.2 when it has a DTLS version enabled in the priority cache.
Disable all DTLS versions in order to disable TLS1.2.
