mdw@git.distorted.org.uk Git - udpkey/blob - debian/README.Debian

   1 udpkey in Debian
   2
   3 The =udpkey= program itself is described in a traditional manual page.
   4 It makes few assumptions about the environment in which it's run, so it
   5 needs some work to integrate it with any particular system.
   6
   7 * Running as a server
   8
   9 To get =udpkey= to run as a server:
  10
  11   + Create a user to run the server, e.g., =adduser --system --group
  12     udpkey=.
  13
  14   + Create =/etc/udpkey/keyring=, and populate it with key fragments and
  15     client public keys as described in the manual.  The keyring file
  16     must be readable by the user created above.
  17
  18   + Create =/etc/default/udpkey=.  This must at the very least set
  19     =UDPKEY_DAEMON=yes= if the daemon is to be run at all.  I chose port
  20     59274 arbitrarily; if you want to use a different one, set
  21     =PORT=12345= or whatever.
  22
  23 * Running as a client in initramfs
  24
  25 Some simple scripts for integrating =udpkey= with =cryptsetup= are
  26 provided in =/usr/share/doc/udpkey/examples=.  See the comments in those
  27 files for details.  Here's the brief version.
  28
  29   + Copy =udpkey.initramfs-hook= into =/etc/initramfs-tools/hooks=.
  30     Install =udpkey.keyscript= somewhere, say =/usr/local/sbin=.
  31
  32   + Create =/etc/udpkey/keyring= and generate a private key.  See the
  33     manual for details of how to do this.  Extract the public key and
  34     transport it to the server.
  35
  36   + Add a line to =/etc/crypttab= of the form
  37     : cvolume    /dev/md/encrypted   keytag/192.0.2.69:59274   luks,keyscript=/usr/local/sbin/udpkey.keyscript
  38     to =/etc/crypttab=.
  39
  40   + Generate a key fragment at your chosen server, here 192.0.2.69.
  41     Import the client's public key and grant it access to the key
  42     fragment.
  43
  44   + Generate a random string of the same length and write it to
  45     =/etc/udpkey/keytag.local=.
  46
  47   + Run
  48     : udpkey keytag 192.0.2.69:59274 /etc/udpkey/keytag.local | sha256sum
  49     to make sure that everything's actually working.  Add the key to
  50     your LUKS superblock.