MANDOS-CLIENTS.CO(5)              Mandos Manual             MANDOS-CLIENTS.CO(5)

       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 “EXPANSION”.

       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 “True”.

       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 hexadecimal 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

       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 required.

           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

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

           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

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

       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

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

       Please report bugs to the Mandos development mailing list:
       <> (subscription required). Note that this list is
       public. The developers can be reached privately at <>
       (OpenPGP key fingerprint 153A 37F1 0BBA 0435 987F 2C4A 7223 2973 CA34
       C2C4 for encrypted mail).

           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 © 2008-2017 Teddy Hogeborn, Björn Påhlsson

       This manual page is free software: you can redistribute it and/or modify
       it under the terms of the GNU General Public License as published by the
       Free Software Foundation, either version 3 of the License, or (at your
       option) any later version.

       This manual page is distributed in the hope that it will be useful, but
       WITHOUT ANY WARRANTY; without even the implied warranty of
       Public License for more details.

       You should have received a copy of the GNU General Public License along
       with this program. If not, see

Mandos 1.7.15                      2017-02-23               MANDOS-CLIENTS.CO(5)