Provided by: pure-ftpd-common_1.0.21-1ubuntu4_all bug

NAME

       pure-authd - External authentication agent for Pure-FTPd.

SYNTAX

       pure-authd   [-p   </path/to/pidfile>]  [-u  uid]  [-g  gid]  [-B]  <-s
       /path/to/socket> -r /program/to/run

DESCRIPTION

       pure-authd is a daemon that forks an authentication program, waits  for
       an authentication reply, and feed them to an application server.

       pure-authd  listens  to  a  local Unix socket. A new connection to that
       socket should feed pure-authd the following structure :

              account:xxx

              password:xxx

              localhost:xxx

              localport:xxx

              peer:xxx

              end

       (replace  xxx  with appropriate values) . localhost, localport and peer
       are numeric IP addresses and ports. peer  is  the  IP  address  of  the
       remote client.

       These   arguments   are   passed  to  the  authentication  program,  as
       environment variables :

              AUTHD_ACCOUNT

              AUTHD_PASSWORD

              AUTHD_LOCAL_IP

              AUTHD_LOCAL_PORT

              AUTHD_REMOTE_IP

       The  authentication  program  should  take appropriate actions to fetch
       account info according to these arguments, and reply  to  the  standard
       output a structure like the following one :

              auth_ok:1

              uid:42

              gid:21

              dir:/home/j

              end

       auth_ok:xxx
              If  xxx  is  0,  the user was not found (the next authentication
              method passed to pure-ftpd will be tried) . If xxx  is  -1,  the
              user  was  found,  but  there was a fatal authentication error :
              user is root, password is wrong, account has expired, etc  (next
              authentication  methods  will  not  be tried) . If xxx is 1, the
              user was found and successfully authenticated.

       uid:xxx
              The system uid to be assigned to that user. Must be > 0.

       gid:xxx
              The primary system gid. Must be > 0.

       dir:xxx
              The absolute path to the home directory. Can contain /./  for  a
              chroot jail.

       slow_tilde_expansion:xxx (optional, default is 1)
              When  the command ’cd ~user’ is issued, it’s handy to go to that
              user’s home directory, as expected in a shell  environment.  But
              fetching   account  info  can  be  an  expensive  operation  for
              non-system accounts. If xxx is 0, ’cd ~user’ will expand to  the
              system  user  home  directory.  If  xxx  is  1, ’cd ~user’ won’t
              expand.  You  should  use  1  in  most   cases   with   external
              authentication,  when  your  FTP users don’t match system users.
              You can also set xxx to 1 if  you’re  using  slow  nss_*  system
              authentication modules.

       throttling_bandwidth_ul:xxx (optional)
              The allocated bandwidth for uploads, in bytes per second.

       throttling_bandwidth_dl:xxx (optional)
              The allocated bandwidth for downloads, in bytes per second.

       user_quota_size:xxx (optional)
              The maximal total size for this account, in bytes.

       user_quota_files:xxx (optional)
              The maximal number of files for this account.

       ratio_upload:xxx (optional)

       radio_download:xxx (optional)
              The user must match a ratio_upload:ratio_download ratio.

       Only  one  authentication  program  is forked at a time. It must return
       quickly.

OPTIONS

       -u <uid>
              Have the daemon run with that uid.

       -g <gid>
              Have the daemon run with that gid.

       -B     Fork in background (daemonization).

       -s </path/to/socket>
              Set the full path to the local Unix socket.

       -R </path/to/program>
              Set the full path to the authentication program.

       -h     Output help information and exit.

EXAMPLES

       To run this program the standard way type:

       pure-authd -s /var/run/ftpd.sock -r /usr/bin/my-auth-program &

       pure-ftpd -lextauth:/var/run/ftpd.sock &

       /usr/bin/my-auth-program can be as simple as :
              #! /bin/sh

              echo ’auth_ok:1’

              echo ’uid:42’

              echo ’gid:21’

              echo ’dir:/home/j’

              echo ’end’

AUTHORS

       Frank DENIS <j@pureftpd.org>

SEE ALSO

       ftp(1),     pure-ftpd(8)    pure-ftpwho(8)    pure-mrtginfo(8)    pure-
       uploadscript(8) pure-statsdecode(8) pure-pw(8) pure-quotacheck(8) pure-
       authd(8)

       RFC 959, RFC 2389, RFC 2228 and RFC 2428.