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Full Discussion: How do I remove commands?
Top Forums UNIX for Dummies Questions & Answers How do I remove commands? Post 302460406 by Corona688 on Wednesday 6th of October 2010 05:20:42 PM
Old 10-06-2010
Quote:
Originally Posted by DGPickett
So, there are no available daemons for direct listening to spawn rsh, rlogin and rcp (rsync, remsh, rexec, . . . ?)? Still, just removing/commenting inetd and maybe services lines seems fragile.
If by 'fragile' you mean 'does not lobotomize it to the point it'll never work again' then yes, it's fragile, and we are weak-minded cowards for suggesting it. Smilie

By broader standards, well: All it amounts to is an init system, if you're willing to rely on your init scripts to boot the machine you can rely on this to not boot RCP. Comment out the RCP settings and it won't understand how to use RCP any more. It's also the correct way; disabling RCP just by blasting holes in the executables doesn't warn inetd of this, so could cause weird error messages. An attacker would have to modify arbitrary files as root, or induce inetd to run and/or modify arbitrary files as root, in order to kick RCP on; if he could do that you're screwed with or without RCP.

(I don't like inetd either, but because of how complicated it makes everything, not any particular security complications. It just runs daemons, the daemons run as per usual.)
Last edited by Corona688; 10-06-2010 at 06:31 PM..
 

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LEARN ABOUT FREEBSD

rcp

RCP(1)							    BSD General Commands Manual 						    RCP(1)

NAME

     rcp -- remote file copy

SYNOPSIS

     rcp [-46p] file1 file2
     rcp [-46pr] file ... directory

DESCRIPTION

     The rcp utility copies files between machines.  Each file or directory argument is either a remote file name of the form
     ``ruser@rhost:path'', or a local file name (containing no ':' characters, or a '/' before any ':'s).

     The following options are available:

     -4      Use IPv4 addresses only.

     -6      Use IPv6 addresses only.

     -p      Cause rcp to attempt to preserve (duplicate) in its copies the modification times and modes of the source files, ignoring the
	     umask(2).	By default, the mode and owner of file2 are preserved if it already existed; otherwise the mode of the source file modi-
	     fied by the umask(2) on the destination host is used.

     -r      If any of the source files are directories, rcp copies each subtree rooted at that name; in this case the destination must be a
	     directory.

     If path is not a full path name, it is interpreted relative to the login directory of the specified user ruser on rhost, or your current user
     name if no other remote user name is specified.  A path on a remote host may be quoted (using '', '"', or ''') so that the metacharacters
     are interpreted remotely.

     The rcp utility does not prompt for passwords; it performs remote execution via rsh(1), and requires the same authorization.

     The rcp utility handles third party copies, where neither source nor target files are on the current machine.

SEE ALSO

     cp(1), ftp(1), rlogin(1), rsh(1), hosts.equiv(5)

HISTORY

     The rcp command appeared in 4.2BSD.  The version of rcp described here has been reimplemented with Kerberos in 4.3BSD-Reno.

BUGS

     Does not detect all cases where the target of a copy might be a file in cases where only a directory should be legal.

     Is confused by any output generated by commands in a .login, .profile, or .cshrc file on the remote host.

     The destination user and hostname may have to be specified as ``rhost.ruser'' when the destination machine is running the 4.2BSD version of
     rcp.

BSD
								 October 16, 2002							       BSD
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