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Remote commands problem using RSH & Rexec
01-15-2008
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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. Pure-FTPd team 1.0.36 pure-authd(8)