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Shell Programming and Scripting
Du multiple selected directory
Post 302776921 by ctsgnb on Thursday 7th of March 2013 05:43:32 AM
03-07-2013
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LEARN ABOUT REDHAT
smrsh
SMRSH(8) System Manager's Manual SMRSH(8) NAME
smrsh - restricted shell for sendmail SYNOPSIS
smrsh -c command DESCRIPTION
The smrsh program is intended as a replacement for sh for use in the ``prog'' mailer in sendmail(8) configuration files. It sharply limits the commands that can be run using the ``|program'' syntax of sendmail in order to improve the over all security of your system. Briefly, even if a ``bad guy'' can get sendmail to run a program without going through an alias or forward file, smrsh limits the set of programs that he or she can execute. Briefly, smrsh limits programs to be in a single directory, by default /etc/smrsh, allowing the system administrator to choose the set of acceptable commands, and to the shell builtin commands ``exec'', ``exit'', and ``echo''. It also rejects any commands with the characters ``', `<', `>', `;', `$', `(', `)', ` ' (carriage return), or ` ' (newline) on the command line to prevent ``end run'' attacks. It allows ``||'' and ``&&'' to enable commands like: ``"|exec /usr/local/bin/procmail -f- /etc/procmailrcs/user || exit 75"'' Initial pathnames on programs are stripped, so forwarding to ``/usr/ucb/vacation'', ``/usr/bin/vacation'', ``/home/server/mydir/bin/vaca- tion'', and ``vacation'' all actually forward to ``/etc/smrsh/vacation''. System administrators should be conservative about populating the /etc/smrsh directory. Reasonable additions are vacation(1), procmail(1), and the like. No matter how brow-beaten you may be, never include any shell or shell-like program (such as perl(1)) in the /etc/smrsh directory. Note that this does not restrict the use of shell or perl scripts in the sm.bin directory (using the ``#!'' syntax); it simply disallows execution of arbitrary programs. FILES
/etc/smrsh - directory for restricted programs SEE ALSO
sendmail(8) $Date: 2002/04/25 13:33:40 $ SMRSH(8)