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* Adding a Client Password to the Server
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The server must be given a password to give back to the client on
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boot time. This password must be a one which can be used to unlock
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the root file system device. On the *client*, run this command:
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mandos-keygen --password
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It will prompt for a password and output a config file section.
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This output should be copied to the Mandos server and added to the
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file "/etc/mandos/clients.conf" there.
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* Testing that it Works (Without Rebooting)
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After the server has been started with this client's key added, it
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is possible to verify that the correct password will be received by
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this client by running the command, on the client:
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/usr/lib/mandos/plugins.d/mandos-client \
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--pubkey=/etc/keys/mandos/pubkey.txt \
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--seckey=/etc/keys/mandos/seckey.txt; echo
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This command should retrieve the password from the server, decrypt
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it, and output it to standard output. There it can be verified to
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be the correct password, before rebooting.
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If it ever should be necessary, the Mandos client can be temporarily
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prevented from running at startup by passing the parameter
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"mandos=off" to the kernel.
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* Specifying a Client Network Interface
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At boot time the network interface to use will by default be
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automatically detected. If this should result in an incorrect
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interface, edit the DEVICE setting in the
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"/etc/initramfs-tools/initramfs.conf" file. (The default setting is
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empty, meaning it will autodetect the interface.) *If* the DEVICE
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setting is changed, it will be necessary to update the initrd image
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by running the command
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update-initramfs -k all -u
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The device can be overridden at boot time on the Linux kernel
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command line using the sixth colon-separated field of the "ip="
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option; for exact syntax, read the documentation in the file
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"/usr/share/doc/linux-doc-*/Documentation/filesystems/nfsroot.txt",
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available in the "linux-doc-*" package.
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Note that since this network interface is used in the initial RAM
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disk environment, the network interface *must* exist at that stage.
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Thus, the interface can *not* be a pseudo-interface such as "br0" or
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"tun0"; instead, only real interface (such as "eth0") can be used.
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This can be overcome by writing a "network hook" program to create
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the interface (see mandos-client(8mandos)) and placing it in
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"/etc/mandos/network-hooks.d", from where it will be copied into the
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initial RAM disk. Example network hook scripts can be found in
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"/usr/share/doc/mandos-client/examples/network-hooks.d".
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* User-Supplied Plugins
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Any plugins found in "/etc/mandos/plugins.d" will override and add
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to the normal Mandos plugins. When adding or changing plugins, do
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not forget to update the initital RAM disk image:
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update-initramfs -k all -u
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* Do *NOT* Edit "/etc/crypttab"
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It is NOT necessary to edit "/etc/crypttab" to specify
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"/usr/lib/mandos/plugin-runner" as a keyscript for the root file
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system; if no keyscript is given for the root file system, the
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Mandos client will be the new default way for getting a password for
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the root file system when booting.
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* Non-local Connection (Not Using ZeroConf)
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If the "ip=" kernel command line option is used to specify a
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complete IP address and device name, as noted above, it then becomes
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possible to specify a specific IP address and port to connect to,
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instead of using ZeroConf. The syntax for doing this is
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"mandos=connect:<IP_ADDRESS>:<PORT_NUMBER>" on the kernel command
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For very advanced users, it it possible to specify simply
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"mandos=connect" on the kernel command line to make the system only
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set up the network (using the data in the "ip=" option) and not pass
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any extra "--connect" options to mandos-client at boot. For this to
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work, "--options-for=mandos-client:--connect=<ADDRESS>:<PORT>" needs
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to be manually added to the file "/etc/mandos/plugin-runner.conf".
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-- Teddy Hogeborn <teddy@recompile.se>, Fri, 1 Jun 2012 23:46:13 +0200
added
removed
debian/mandos-client.README.Debian
