procmail没有正确执行脚本

Question

I'm having a strange issue with running scripts (perl and ruby failing) from incoming mail locally delivered by procmail.

The system is CentOS 5.5 with postfix as my mailer, then a .forward set up to send email on to procmail. The .procmailrc and scripts are identical to a working setup on an Ubuntu server.

Here's the .procmailrc:

PATH= /usr/local/bin:/usr/bin:${PATH}
SHELL=/bin/bash
MAILDIR=$HOME/Maildir
DEFAULT=${MAILDIR}/
LOGABSTRACT=yes
LOGFILE=$HOME/Maildir/proclog
VERBOSE=YES

:0 wc
* ^To.*web@mydomain.com
| /home/web/perltest.pl

Here's the perl script:

#!/usr/bin/env perl

system("touch /home/web/touchedfile");

And then the failure in the log upon receiving email:

procmail: Executing "/home/web/perltest.pl"
/home/web/perltest.pl: line 3: syntax error near unexpected token `"touch /home/web/touchedfile"'
/home/web/perltest.pl: line 3: `system("touch /home/web/touchedfile");'

The line endings are all UNIX. The script runs fine from the command line.

The whole setup works fine if I pipe to procmail directly from the command line, but when it's invoked as part of the local delivery process, the #! line seems to be ignored in the script.

I can get the perl script to run if I explicitly execute perl in the pipe, like so:

:0 wc
* ^To.*web@mydomain.com
| perl /home/web/perltest.pl

... but I really don't want to admit defeat and do that.

Answer 1

The problem is selinux, if you turn that off it should work. I'm not sure how to fix it with selinux enabled.

Here's a way to fix it and still have selinux running. Run chcon system_u:object_r:procmail_exec_t on your perl or ruby scripts. I've verified that is a fix, but I'm not familiar enough with selinux to be sure it's the "correct" fix.