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/etc/hosts.equiv - list of hosts and users that are granted "trusted" r
command access to your system
The hosts.equiv file allows or denies hosts and users to use the r-
commands (e.g. rlogin, rsh or rcp) without supplying a password.
The file uses the following format:
[ + | - ] [hostname] [username]
The hostname is the name of a host which is logically equivalent to the
local host. Users logged into that host are allowed to access like-
named user accounts on the local host without supplying a password.
The hostname may be (optionally) preceded by a plus (+) sign. If the
plus sign is used alone it allows any host to access your system. You
can explicitly deny access to a host by preceding the hostname by a
minus (-) sign. Users from that host must always supply a password.
For security reasons you should always use the FQDN of the hostname and
not the short hostname.
The username entry grants a specific user access to all user accounts
(except root) without supplying a password. That means the user is NOT
restricted to like-named accounts. The username may be (optionally)
preceded by a plus (+) sign. You can also explicitly deny access to a
specific user by preceding the username with a minus (-) sign. This
says that the user is not trusted no matter what other entries for that
Netgroups can be specified by preceding the netgroup by an @ sign.
Be extremely careful when using the plus (+) sign. A simple
typographical error could result in a standalone plus sign. A
standalone plus sign is a wildcard character that means "any host"!
Some systems will only honor the contents of this file when it has
owner root and no write permission for anybody else. Some exceptionally
paranoid systems even require that there be no other hard links to the
Modern systems use the Pluggable Authentication Modules library (PAM).
With PAM a standalone plus sign is only considered a wildcard character
which means "any host" when the word promiscuous is added to the auth
component line in your PAM file for the particular service (e.g.
rhosts(5), rlogind(8), rshd(8)