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Shell Programming and Scripting
Not able to display the value I am accepting as an argument
Post 302130497 by mahek_bedi on Monday 6th of August 2007 11:54:47 AM
08-06-2007
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LEARN ABOUT FREEBSD
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 /usr/libexec/sm.bin, 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/filter || exit 75"'' Initial pathnames on programs are stripped, so forwarding to ``/usr/bin/vacation'', ``/home/server/mydir/bin/vacation'', and ``vacation'' all actually forward to ``/usr/libexec/sm.bin/vacation''. System administrators should be conservative about populating the sm.bin directory. For example, a reasonable additions is vacation(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 sm.bin direc- tory. Note that this does not restrict the use of shell or perl scripts in the sm.bin directory (using the ``#!'' syntax); it simply dis- allows execution of arbitrary programs. Also, including mail filtering programs such as procmail(1) is a very bad idea. procmail(1) allows users to run arbitrary programs in their procmailrc(5). COMPILATION
Compilation should be trivial on most systems. You may need to use -DSMRSH_PATH="path" to adjust the default search path (defaults to ``/bin:/usr/bin'') and/or -DSMRSH_CMDDIR="dir" to change the default program directory (defaults to ``/usr/libexec/sm.bin''). FILES
/usr/adm/sm.bin - default directory for restricted programs on most OSs /var/adm/sm.bin - directory for restricted programs on HP UX and Solaris /usr/libexec/sm.bin - directory for restricted programs on FreeBSD (>= 3.3) and DragonFly BSD SEE ALSO
sendmail(8) $Date: 2013-11-22 20:52:00 $ SMRSH(8)