NAME

       update-openssh-knwon-hosts - download, filter and merge known_hosts for OpenSSH

SYNOPSIS

       update-openssh-known-hosts [-f]

DESCRIPTION

       update-openssh-known-hosts  manages downloading, filtering and mergeing of ssh_known_hosts
       files from anywhere into one local file for use by ssh(1).

OPTIONS

       -f     treat every non-zero exit from download plugin as an error, see EXIT_IGNORE below.

RETURN VALUES

       Returns zero on success and anything else on error.

ENVIRONMENT

       CONFDIR
              Configuration directory, defaults to /etc/openssh-known-hosts.  Currently there  is
              only a sources subdirectory in it.

       PLUGIN_PATH
              Plugin              search              path,              defaults              to
              /usr/local/share/openssh-known-hosts/plugins:/usr/share/openssh-known-hosts/plugins.

       CACHEDIR
              Cache directory, defaults to /var/cache/openssh-known-hosts.

       LOCK   Lockfile path, defaults to /var/lock/openssh-known-hosts.

       OUTFILE
              Output file name, defaults to /var/lib/openssh-known-hosts/ssh_known_hosts

SOURCE DEFINITIONS

       A  source  definition  is  shell snippet dropped into CONFDIR/sources/ with a run-parts(8)
       compliant name.  There are two variables not specific to a download plugin:

       PLUGIN name of the download plugin to use, searched for in PLUGIN_PATH.

       EXIT_IGNORE
              optional space-seperated list of exitcodes which should be ignored.  Upon such exit
              code the previously downloaded version is used.

DOWNLOAD PLUGINS

       Download  plugins  are  executables dropped into PLUGIN_PATH and referenced via the PLUGIN
       variable in the source definition.   A  plugin  gets  the  variables  set  in  the  source
       definition  in  its  environment.  The working directory will be set to the source's cache
       directory.  Everything a plugin has to do is to create a file named "new".  "current" must
       not  be touched but can be used as a hint to skip downloading the same file again.  stdout
       and stderr will be connected to "log", which will be output  on  error.   Plugins  needn't
       create "new" if it would be identical to "current".

HOSTNAME FILTERS

       Place  a  file  foo.filter  next to your source definition foo.  Each line shall contain a
       rule consisting of an action, a space and a pattern.   The  first  rule  with  a  matching
       pattern  decides:  If  the  action starts with a, o, p or y (for accept, admit, allow, ok,
       pass, permit, print, yes, ...) the hostname will be used, otherwise it is discarded.  If a
       key has no hostnames left it is discarded as a whole.

SEE ALSO

       ssh(1), sshd(8), ssh_config(5), curl(1), rsync(1), psql(1), run-parts(8)

AUTHORS

       Timo Weingärtner <timo@tiwe.de>.

                                            2014-02-03              UPDATE-OPENSSH-KNOWN-HOSTS(8)