.\" $OpenBSD: sasyncd.conf.5,v 1.10 2006/05/26 04:02:59 deraadt Exp $
.\"
.\" Copyright (c) 2005 Håkan Olsson.  All rights reserved.
.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" This code was written under funding by Multicom Security AB.
.\"
.\" Manual page for sasyncd.conf
.\"
.Dd August 07, 2004
.Dt SASYNCD.CONF 5
.Os
.Sh NAME
.Nm sasyncd.conf
.Nd configuration file for sasyncd
.Sh DESCRIPTION
.Nm
is the configuration file for the
.Xr sasyncd 8
daemon.
.Pp
Comments can be put anywhere in the file using a hash mark
.Pq Sq # ,
and extends to the end of the current line.
.Pp
Since the file contains the shared secret key used to encrypt data
between this host and the others,
.Pa /etc/sasyncd.conf
must be owned either by
.Dq root
or the
.Dq _isakmpd
pseudo user and be readable only by this owner, e.g.\&
.Bd -literal -offset indent
# chown root /etc/sasyncd.conf
# chmod 0600 /etc/sasyncd.conf
.Ed
.Pp
The following configuration settings are understood:
.Bl -tag -width Ds
.It Xo
.Ic carp interface
.Ar interface Op Ic interval Ar seconds
.Xc
Specify which
.Xr carp 4
interface
.Nm sasyncd
should track master/slave state on.
Optionally state how often the daemon should check the interface
for state changes.
Defaults to once every 10 seconds.
.It Ic flushmode sync | startup | never
Controls how the
.Xr sasyncd 8
master host handles SADB_FLUSH messages to its slaves.
.Pp
.Bl -tag -width "startupXX" -offset indent -compact
.It Ic sync
Pass any SADB_FLUSH messages along.
For example, in this mode
.Xr sasyncd 8
will synchronize an
.Ic ipsecctl -F
command to all connected slaves.
For more information, see
.Xr ipsecctl 8 .
.It Ic startup
Send a SADB_FLUSH message to the slaves as they connect, and act as
.Ic sync
afterwards.
This is the default.
.It Ic never
Never send SADB_FLUSH messages.
.El
.It Xo
.Ic listen on Ar address
.Op Ar family
.Op Ic port Ar port
.Xc
Specify a local IP address, hostname, or interface the
.Xr sasyncd 8
daemon should listen on.
The default is to listen on all local addresses.
When using an interface name,
.Ar family
may be given as
.Dq inet
or
.Dq inet6
to only bind using the specified address family.
Finally,
.Ar port
can be used to specify which TCP port
.Xr sasyncd 8
should listen to.
The default is to listen to port 500.
.It Ic mode master | slave
Force the daemon to run as master or slave.
Normally only intended for debugging use.
.It Ic mode skipslave
Prevent the daemon from syncing SA or SPD messages where the source or
destination address is one of the configured peers.
Intended to permit IPsec
.Xr pfsync 4
protection.
This mode is experimental.
.It Ic peer Ar address
Specify a
.Xr sasyncd 8
peer IP address or hostname.
May be specified multiple times.
For example:
.Bd -literal -offset indent
peer 10.0.0.2
peer 10.0.0.3
peer 10.0.0.4
.Ed
.It Ic sharedkey Ar key
The shared AES key used to encrypt messages between
.Xr sasyncd 8
hosts.
This configuration setting is required and must be either 16, 24 or 32
bytes long (corresponding to AES using a 128, 192 or 256 bit key).
.El
.Sh SEE ALSO
.Xr chmod 1 ,
.Xr carp 4 ,
.Xr chown 8 ,
.Xr ipsecctl 8 ,
.Xr sasyncd 8
.Sh HISTORY
The
.Nm
file format first appeared in
.Ox 3.8 .