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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 password.  Keyfile holds a 41-byte
       record for each user in the database.  Each record is  encrypted  sepa-
       rately  and contains the user's name, DES key, status, host status, and
       expiration 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 informa-
       tion, and one for SecureNet user  information.   A  user  need  not  be
       installed  in  both databases but must be installed in the Plan 9 data-
       base 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  data-
       base.   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 newline 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.   Writ-
              ing 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 dis-
              ables 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

       status The current status of the account, either ok or disabled.  Writ-
              ing 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 argument 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;  warn-
       ing'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)