Provided by: mandos_1.7.1-2build1_all bug


       mandos-clients.conf - Configuration file for the Mandos server




       The file /etc/mandos/clients.conf is a configuration file for mandos(8), read by it at
       startup. The file needs to list all clients that should be able to use the service. The
       settings in this file can be overridden by runtime changes to the server, which it saves
       across restarts. (See the section called “PERSISTENT STATE” in mandos(8).) However, any
       changes to this file (including adding and removing clients) will, at startup, override
       changes done during runtime.

       The format starts with a [section header] which is either [DEFAULT] or [client name]. The
       client name can be anything, and is not tied to a host name. Following the section header
       is any number of “option=value” entries, with continuations in the style of RFC 822.
       “option: value” is also accepted. Note that leading whitespace is removed from values.
       Values can contain format strings which refer to other values in the same section, or
       values in the “DEFAULT” section (see the section called “EXPANSION”). Lines beginning with
       “#” or “;” are ignored and may be used to provide comments.


       Note: all option values are subject to start time expansion, see the section called

       Unknown options are ignored. The used options are as follows:

       approval_delay = TIME
           This option is optional.

           How long to wait for external approval before resorting to use the approved_by_default
           value. The default is “PT0S”, i.e. not to wait.

           The format of TIME is the same as for timeout below.

       approval_duration = TIME
           This option is optional.

           How long an external approval lasts. The default is 1 second.

           The format of TIME is the same as for timeout below.

       approved_by_default = { 1 | yes | true | on | 0 | no | false | off }
           Whether to approve a client by default after the approval_delay. The default is

       checker = COMMAND
           This option is optional.

           This option overrides the default shell command that the server will use to check if
           the client is still up. Any output of the command will be ignored, only the exit code
           is checked: If the exit code of the command is zero, the client is considered up. The
           command will be run using “/bin/sh -c”, so PATH will be searched. The default value
           for the checker command is “fping -q -- %%(host)s”. Note that mandos-keygen, when
           generating output to be inserted into this file, normally looks for an SSH server on
           the Mandos client, and, if it find one, outputs a checker option to check for the
           client’s key fingerprint – this is more secure against spoofing.

           In addition to normal start time expansion, this option will also be subject to
           runtime expansion; see the section called “EXPANSION”.

       extended_timeout = TIME
           This option is optional.

           Extended timeout is an added timeout that is given once after a password has been sent
           successfully to a client. The timeout is by default longer than the normal timeout,
           and is used for handling the extra long downtime while a machine is booting up. Time
           to take into consideration when changing this value is file system checks and quota
           checks. The default value is 15 minutes.

           The format of TIME is the same as for timeout below.

       fingerprint = HEXSTRING
           This option is required.

           This option sets the OpenPGP fingerprint that identifies the public key that clients
           authenticate themselves with through TLS. The string needs to be in hexidecimal form,
           but spaces or upper/lower case are not significant.

       host = STRING
           This option is optional, but highly recommended unless the checker option is modified
           to a non-standard value without “%%(host)s” in it.

           Host name for this client. This is not used by the server directly, but can be, and is
           by default, used by the checker. See the checker option.

       interval = TIME
           This option is optional.

           How often to run the checker to confirm that a client is still up.  Note: a new
           checker will not be started if an old one is still running. The server will wait for a
           checker to complete until the below “timeout” occurs, at which time the client will be
           disabled, and any running checker killed. The default interval is 2 minutes.

           The format of TIME is the same as for timeout below.

       secfile = FILENAME
           This option is only used if secret is not specified, in which case this option is

           Similar to the secret, except the secret data is in an external file. The contents of
           the file should not be base64-encoded, but will be sent to clients verbatim.

           File names of the form ~user/foo/bar and $ENVVAR/foo/bar are supported.

       secret = BASE64_ENCODED_DATA
           If this option is not specified, the secfile option is required to be present.

           If present, this option must be set to a string of base64-encoded binary data. It will
           be decoded and sent to the client matching the above fingerprint. This should, of
           course, be OpenPGP encrypted data, decryptable only by the client. The program mandos-
           keygen(8) can, using its --password option, be used to generate this, if desired.

           Note: this value of this option will probably be very long. A useful feature to avoid
           having unreadably-long lines is that a line beginning with white space adds to the
           value of the previous line, RFC 822-style.

       timeout = TIME
           This option is optional.

           The timeout is how long the server will wait, after a successful checker run, until a
           client is disabled and not allowed to get the data this server holds. By default
           Mandos will use 5 minutes. See also the extended_timeout option.

           The TIME is specified as an RFC 3339 duration; for example “P1Y2M3DT4H5M6S” meaning
           one year, two months, three days, four hours, five minutes, and six seconds. Some
           values can be omitted, see RFC 3339 Appendix A for details.

       enabled = { 1 | yes | true | on | 0 | no | false | off }
           Whether this client should be enabled by default. The default is “true”.


       There are two forms of expansion: Start time expansion and runtime expansion.

       Any string in an option value of the form “%(foo)s” will be replaced by the value of the
       option foo either in the same section, or, if it does not exist there, the [DEFAULT]
       section. This is done at start time, when the configuration file is read.

       Note that this means that, in order to include an actual percent character (“%”) in an
       option value, two percent characters in a row (“%%”) must be entered.

       This is currently only done for the checker option.

       Any string in an option value of the form “%%(foo)s” will be replaced by the value of the
       attribute foo of the internal “Client” object in the Mandos server. The currently allowed
       values for foo are: “approval_delay”, “approval_duration”, “created”, “enabled”,
       “expires”, “fingerprint”, “host”, “interval”, “last_approval_request”, “last_checked_ok”,
       “last_enabled”, “name”, “timeout”, and, if using D-Bus, “dbus_object_path”. See the source
       code for details.  Currently, none of these attributes except “host” are guaranteed to be
       valid in future versions.  Therefore, please let the authors know of any attributes that
       are useful so they may be preserved to any new versions of this software.

       Note that this means that, in order to include an actual percent character (“%”) in a
       checker option, four percent characters in a row (“%%%%”) must be entered. Also, a bad
       format here will lead to an immediate but silent run-time fatal exit; debug mode is needed
       to expose an error of this kind.


       The file described here is /etc/mandos/clients.conf


       The format for specifying times for timeout and interval is not very good.

       The difference between %%(foo)s and %(foo)s is obscure.


           timeout = PT5M
           interval = PT2M
           checker = fping -q -- %%(host)s

           # Client "foo"
           fingerprint =  7788 2722 5BA7 DE53 9C5A  7CFA 59CF F7CD BD9A 5920
           secret =
           host =
           interval = PT1M

           # Client "bar"
           fingerprint = 3e393aeaefb84c7e89e2f547b3a107558fca3a27
           secfile = /etc/mandos/bar-secret
           timeout = PT15M
           approved_by_default = False
           approval_delay = PT30S


       intro(8mandos), mandos-keygen(8), mandos.conf(5), mandos(8), fping(8)

       RFC 3339: Date and Time on the Internet: Timestamps
           The time intervals are in the "duration" format, as specified in ABNF in Appendix A of
           RFC 3339.


       Copyright © 2008-2015 Teddy Hogeborn, Björn Påhlsson

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