07-11-2001
The first step in blocking remote logins is also one of the first steps everyone should do after bringing up a new server:
(1) Edit the /etc/inetd.conf file and comment out all services you will not immediately need;
(2) Examples (for me) include all the r* commands, finger, etc.
This is critical for security and is just a good practice. Don't leave these services running unless you actively use them.
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fingerd(1M) fingerd(1M)
NAME
fingerd - remote user information server
SYNOPSIS
DESCRIPTION
is the server for the RFC 742 Name/Finger protocol. It provides a network interface to which gives a status report of users currently
logged in on the system or a detailed report about a specific user (see finger(1)). The Internet daemon executes when it receives a ser-
vice request at the port listed in the services data base for ``finger'' using ``tcp'' protocol; see inetd(1M) and services(4).
To start from the configuration file must contain an entry as follows:
Once a remote host is connected, reads a single ``command line'' terminated by a carriage-return and line-feed. It uses this command line
as the arguments to an invocation of sends the output of to the remote host and closes the connection.
If the command line is null (contains only a carriage-return and line-feed pair), returns a report that lists all users logged in on the
system at that moment.
If a user name is specified on the command line (for example, user<CR><LF>), the response lists more extended information for only that
particular user, whether logged in or not. See finger(1) for the details of this extended information.
If is run with the option, it allows remote user names on the command line (for example, user@host<CR><LF>). Otherwise, if the command
line contains a remote user name, prints the error message and closes the connection.
AUTHOR
was developed by the University of California, Berkeley and HP.
SEE ALSO
finger(1), inetd(1M), services(4),
RFC 742 for the Name/Finger protocol.
fingerd(1M)