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Top Forums Shell Programming and Scripting duplicate entries /.rhosts file Post 302360981 by Smiling Dragon on Sunday 11th of October 2009 09:26:01 PM
Old 10-11-2009
There's no immediate problem having duplicate entries in your .rhosts file.

BUT, should you want to remove a server from it later, you run the risk of accidentally removing only one instead of all the instances of that server name.

I'd suggest you run the file through 'sort -u' or uniq to remove the duplicates, thus reducing your operational risk.

I'll also add the obligatory comment that perhaps you should not be using rhosts at all? ssh keys for individual accounts that you want to trust is 90% of the time a better option. Otherwise, if one host is compromised, all of them are.
 
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PAM_RHOSTS(8)							 Linux-PAM Manual						     PAM_RHOSTS(8)

NAME
pam_rhosts - The rhosts PAM module SYNOPSIS
pam_rhosts.so DESCRIPTION
This module performs the standard network authentication for services, as used by traditional implementations of rlogin and rsh etc. The authentication mechanism of this module is based on the contents of two files; /etc/hosts.equiv (or and ~/.rhosts. Firstly, hosts listed in the former file are treated as equivalent to the localhost. Secondly, entries in the user's own copy of the latter file is used to map "remote-host remote-user" pairs to that user's account on the current host. Access is granted to the user if their host is present in /etc/hosts.equiv and their remote account is identical to their local one, or if their remote account has an entry in their personal configuration file. The module authenticates a remote user (internally specified by the item PAM_RUSER connecting from the remote host (internally specified by the item PAM_RHOST). Accordingly, for applications to be compatible this authentication module they must set these items prior to calling pam_authenticate(). The module is not capable of independently probing the network connection for such information. OPTIONS
debug Print debug information. silent Don't print informative messages. superuser=account Handle account as root. MODULE TYPES PROVIDED
Only the auth module type is provided. RETURN VALUES
PAM_AUTH_ERR The remote host, remote user name or the local user name couldn't be determined or access was denied by .rhosts file. PAM_USER_UNKNOWN User is not known to system. EXAMPLES
To grant a remote user access by /etc/hosts.equiv or .rhosts for rsh add the following lines to /etc/pam.d/rsh: #%PAM-1.0 # auth required pam_rhosts.so auth required pam_nologin.so auth required pam_env.so auth required pam_unix.so SEE ALSO
rootok(3), hosts.equiv(5), rhosts(5), pam.conf(5), pam.d(5), pam(8) AUTHOR
pam_rhosts was written by Thorsten Kukuk <kukuk@thkukuk.de> Linux-PAM Manual 09/19/2013 PAM_RHOSTS(8)

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