Man pages sections > man8 > pure-authd

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

pure-authd(8) Pure-FTPd pure-authd(8)

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
 
AUTHD_ENCRYPTED
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 at pureftpd dot 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.
1.0.46 Pure-FTPd team