TELNETLOGIN(8)

NAME
telnetlogin - login wrapper for telnetd

SYNOPSIS
telnetlogin [-h host] [-p]

DESCRIPTION
telnetlogin is a setuid wrapper that runs login(1). It is meant to be invoked by telnetd(8); the idea is to remove the necessity of running telnetd as root.

telnetlogin should be installed mode 4750, user root, group telnetd. Then, telnetd may be run from /etc/inetd.conf as user ``nobody'', group ``telnetd'', and with the option -L path-to-telnetlogin.

telnetlogin accepts only the subset of options to login(1) shown above, in the order listed. This is the order telnetd 8 normally provides them in. telnetlogin also only accepts the environment variables TERM, DISPLAY, POSIXLY_CORRECT, and REMOTEHOST. It also insists that the standard input, output, and error streams are open on a terminal, and that it is the process group leader of the foreground process of that terminal. After checking all of these conditions, checking the values of the above environment variables for reasonable values, resetting signal handlers, and so forth, it execs login.

SEE ALSO
login(1), inetd.conf(5), inetd(8), telnetd(8)

RESTRICTIONS
telnetlogin does not permit the -f option to login, and does not permit passing a username, so will not work with telnetds that perform authentication via Kerberos or SSL.

THIS IS PRESENTLY EXPERIMENTAL CODE; USE WITH CAUTION.

HISTORY
telnetlogin was written during the development of NetKit 0.17.