Red Hat Bugzilla – Bug 187935
SELinux Doesn't Let Postfix CC E-mail using Procmail
Last modified: 2007-11-30 17:11:29 EST
Description of problem: This is an obscure problem. Basically it involves three packages: Postfix, Procmail, and SELinux (Possibly TCSH as well). On my FC4 Postfix mail server, with SELinux Targetted policy, I cannot have Procmail CC or forward e-mail I receive to an outside system. My .procmailrc file is set to CC my phone (different e-mail address on a different system) when I get e-mail from certain senders. This worked fine until I upgraded to FC4 (And activated SELinux Targetted policy), then it silently stopped. After tracing the problem over many months, I discovered that SELinux is not allowing postfix_local_t (The context that Procmail is apparently running under) to access the 'sendmail' command, and thus my CC dies and my alerts are not sent. Version-Release number of selected component (if applicable): Fedora Core 4 (Updated as of April 3 2006) postfix-2.2.2-2 procmail-3.22-16 selinux-policy-targeted-1.27.1-2.22 How reproducible: Always Steps to Reproduce: 1. Use Postfix as MTA 2. Enable Targetted policy in SELinux 3. Setup a ~/.procmailrc file to forward or CC e-mail to an outside address 4. Check audit.log for errors such as: <pre>type=AVC msg=audit(1143517619.762:8619): avc: denied { read } for pid=30024 comm="procmail" name="sendmail" dev=dm-3 ino=1081577 scontext=root:system_r:postfix_local_t tcontext=system_u:object_r:sbin_t tclass=lnk_file</pre> Actual results: CC not sent Expected results: CC sent Additional info: I am using TCSH as my shell, and I get a lot of errors when it is invoked by Postfix/Procmail since it is not able to read /etc/profile.d/*.csh, but that doesn't seem to do more than fill up my audit.log file. Running audit2allow gives me the following: allow postfix_local_t etc_t:file ioctl; (Seems to be the above-mentioned *.csh files) allow postfix_local_t initrc_var_run_t:file getattr; (Not sure about this one) allow postfix_local_t self:file read; (Or this one) allow postfix_local_t sbin_t:lnk_file read; (This is the one where it's bailing on sendmail (Which is a link to sendmail.postfix since that is my MTA)
Has anyone looked at this?
I believe this is fixed in FC5. Have you tried this on FC5? In FC4 we did not have procmail policy, so I believe this is what is causing the problem. We could either add procmail to FC4 policy or add these allow rules.
No, I have not yet tried FC5. I've been waiting for it to stabilize a bit before I break my machines with it. FC4 has some procmail rules, but they seem baseline, which would make sense if the policy was never really fleshed out. Personally, I would like more than just the allow rules. They strike me as possibly a bit over-broad. I would like to see a full(er) policy, especially if it wouldn't be too much trouble to backport it from FC5.
Any luck on this? If it is too much effort to backport the Procmail rules from FC5, I would be happy with just adding the allow rules.
Just add the allow rules. We are not planning on backporting to FC4.