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HOSTS.EQUIV(5)                      Linux Programmer's Manual                      HOSTS.EQUIV(5)



NAME
       /etc/hosts.equiv  - list of hosts and users that are granted "trusted" r command access to
       your system

DESCRIPTION
       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) with‐
       out 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 host exist.

       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"!

FILES
       /etc/hosts.equiv

NOTES
       Some systems will honor the contents of this file only 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 file.

       Modern  systems use the Pluggable Authentication Modules library (PAM).  With PAM a stand‐
       alone plus sign is considered a wildcard character which means "any host"  only  when  the
       word  promiscuous  is added to the auth component line in your PAM file for the particular
       service (e.g., rlogin).

SEE ALSO
       rhosts(5), rlogind(8), rshd(8)

COLOPHON
       This page is part of release 3.74 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.



Linux                                       2003-08-24                             HOSTS.EQUIV(5)


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