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ntp: add support for interleaved client/server mode

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Adapt the interleaved symmetric mode for client/server associations.
On server, save the state needed for detection and responding in the
interleaved mode in the client log. On client, enable the interleaved
mode when the server is specified with the xleave option. Always accept
responses in basic mode to allow synchronization with servers that
don't support the interleaved mode, have too many clients, or have
multiple clients behing the same IP address. This is also necessary to
prevent DoS attacks on the client by overwriting or flushing the server
state. Protect the client's state variables against replay attacks as
the timestamps are now needed when processing the subsequent packet.
This commit is contained in:
Miroslav Lichvar
2016-10-11 17:15:56 +02:00
parent bd736f9234
commit 96d652e5bd
4 changed files with 98 additions and 19 deletions
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2
clientlog.h
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@@ -33,10 +33,12 @@
extern void CLG_Initialise(void);
extern void CLG_Finalise(void);
extern int CLG_GetClientIndex(IPAddr *client);
extern int CLG_LogNTPAccess(IPAddr *client, struct timespec *now);
extern int CLG_LogCommandAccess(IPAddr *client, struct timespec *now);
extern int CLG_LimitNTPResponseRate(int index);
extern int CLG_LimitCommandResponseRate(int index);
extern void CLG_GetNtpTimestamps(int index, NTP_int64 **rx_ts, NTP_int64 **tx_ts);
/* And some reporting functions, for use by chronyc. */