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"Pipe to program" is the CGI of mail. When an e-mail arrives, instead of appending to a file, sendmail runs a program (or script) and feeds the mail to its standard input.
Actually, with RedHat-6.0 sendmail comes with "pipe to program" enabled, but essentially only a limited number of programs are runnable. User security was not an issue on my machine, so I found it easiest to enable running of everything. Besides, there was no man page for smrsh.
To liberalize "pipe to program" we need to modify sendmail.cf (by modifying sendmail.mc) so that the restricted shell is not used. Strangely, uncommenting the smrsh feature didn't work, I needed to change the shell from /usr/sbin/smrsh to /bin/bash. Without this change I kept getting a "Service unavailable" error message in the /var/log/maillog file.
The header of /etc/sendmail.mc of RedHat-6 has a bug. The proper command line is...<
m4 /etc/sendmail.mc >/etc/sendmail.cf
You need to do this when you change sendmail.mc. Hopefully, RedHat will extend the super cool Makefile idea in /etc/mail so you only have to type make. You will need to install sendmail-cf.something.rpm first. e.g. ...
rpm -i sendmail-cf-8.9.3-10.i386.rpm
Whenever you modify the sendmail.cf file, you should restart sendmail...
From: Jeppe Sorensen of maxiom.se ...
One can solve the security issue by simply putting the mail2news.pl script in the /etc/smrsh directory and chown and chmod the file accordingly.
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