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Plan 9 - man page for keyfs (plan9 section 4)

KEYFS(4)			     Kernel Interfaces Manual				 KEYFS(4)

       keyfs, warning - authentication database files

       auth/keyfs [ -d ] [ -p ] [ -w [np] ] [ -mmntpt ] [ -kkey ] [ keyfile ]

       auth/warning [ -n ] [ -p ]

       Keyfs  serves  a two-level file tree for manipulating authentication information.  It runs
       on the machine providing authentication service for the local Plan 9 network, which may be
       a  dedicated authentication server or a CPU server.  The programs described in auth(8) use
       keyfs as their interface to the authentication database.

       Keyfs reads and decrypts file keyfile (default /adm/keys) using the DES key key, which  is
       by  default  read from #r/nvram (see rtc(3)).  With option -p, keyfs prompts for the pass-
       word.  Keyfile holds a 41-byte record for each user  in	the  database.	 Each  record  is
       encrypted separately and contains the user's name, DES key, status, host status, and expi-
       ration date.  The name is a null-terminated UTF string NAMELEN bytes long.  The status  is
       a byte containing binary 0 if the account is enabled, 1 if it is disabled.  Host status is
       a byte containing binary 1 if the user is a host, 0 otherwise.	The  expiration  date  is
       four-byte  little-endian integer which represents the time in seconds since the epoch (see
       date(1)) at which the account will expire.  If any changes are made to the  database  that
       affect the information stored in keyfile, a new version of the file is written.

       There  are  two	authentication	databases,  one  for Plan 9 user information, and one for
       SecureNet user information.  A user need not be installed in both databases  but  must  be
       installed in the Plan 9 database to connect to a Plan 9 server.

       Keyfs  serves  an  interpretation of the keyfile in the file tree rooted at mntpt (default
       /mnt/keys).  Each user user in keyfile is represented as the directory mntpt/user.

       Making a new directory in mntpt creates a new user entry  in  the  database.   Removing	a
       directory  removes  the	user  entry, and renaming it changes the name in the entry.  Such
       changes are reflected immediately in keyfile.  Keyfs does not allow duplicate  names  when
       creating or renaming user entries.

       All  files in the user directories except for key contain UTF strings with a trailing new-
       line when read, and should be written as UTF strings with or without a  trailing  newline.
       Key contains the DESKEYLEN-byte encryption key for the user.

       The following files appear in the user directories.

       key    The authentication key for the user.  If the user's account is disabled or expired,
	      reading this file returns an error.  Writing key changes the key in the database.

       log    The number of consecutive failed authentication attempts for the user.  Writing the
	      string  bad  increments  this  number;  writing good resets it to 0.  If the number
	      reaches fifty, keyfs disables the account.  Once the account is disabled, the  only
	      way to enable it is to write the string ok to status.  This number is not stored in
	      keyfile, and is initialized to 0 when keyfs starts.

       status The current status of the account, either ok or disabled.  Writing ok  enables  the
	      account; writing disabled disables it.

       expire The  expiration  time  for  the  account.  When read, it contains either the string
	      never or the time in seconds since the epoch that the account  will  expire.   When
	      written  with  strings  of the same form, it sets the expiration date for the user.
	      If the expiration date is reached, the account is not disabled, but key  cannot  be
	      read without an error.

       ishost This  file  exists  only if the user is a host (the host status for the user is 1).
	      Hosts are the only users able to receive calls.  Creating it makes the user a  host
	      and sets the host status to 1, and removing it sets the host status to 0.

       If  the -w option is on, keyfs runs the command warning once every 24 hours to mail people
       about expiring keys.  Warnings are sent 14 days and 7 days prior to expiration.	The argu-
       ment  to -w, either p or n, is passed to warning to restrict the warnings to the Plan 9 or
       SecureNet database.  The default for keyfs is not to call warning at  all;  warning's  own
       default	is  to warn about both.  The files /adm/netkeys.who and /adm/keys.who are used to
       find the mail addresses to send to.  The first word on each line identifies a  user.   Any
       subsequent strings on the line delimited '<' and '>' are considered mail addresses to send
       warnings to.  If multiple lines match a user, the last in the file  is  used.   Changeuser
       (see auth(8)) adds lines to these files.

	      Encrypted key file for the Plan 9 database.

	      Encrypted key file for the SecureNet database.

	      List of users in the Plan 9 database.

	      List of users in	the SecureNet database.

	      The non-volatile RAM on the server, which holds the key used to decrypt key files.


       auth(6), namespace(6), auth(8)


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