Miroslav Lichvar 89b127bf6c ntp: accept NTPv4 packets with truncated MACs ...

In order to allow deterministic parsing of NTPv4 extension fields, the
MAC must not be longer than 192 bits (RFC 7822). One way to get around
this limitation when using symmetric keys which produce longer MACs is
to truncate them to 192 bits (32-bit key ID and 160-bit hash).

Modify the code to accept NTPv4 packets with MACs truncated to 192
bits, but still allow long MACs in NTPv4 packets to not break
compatibility with older chrony clients.

2016-12-02 14:53:03 +01:00

3.4 KiB

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