Description of problem: SELinux is preventing exim from execute_no_trans access on the file /usr/sbin/deliver. Version-Release number of selected component (if applicable): cyrus-imapd-3.0.11-1.fc31.x86_64 exim-4.92.3-1.fc31.x86_64 selinux-policy-3.14.4-40.fc31.x86_64 How reproducible: always. Steps to Reproduce: 1. Configure the delivery transport in exim.conf: lmtp_delivery: home_directory = /var/spool/imap driver = lmtp command = "/usr/lib/cyrus-imapd/deliver -l" batch_max = 20 user = cyrus 2. Send a letter to be delivered by this transport. Actual results: type=AVC msg=audit(1575561979.386:7947): avc: denied { execute_no_trans } for pid=28600 comm="exim" path="/usr/sbin/deliver" dev="mmcblk0p3" ino=26652 scontext=system_u:system_r:exim_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=0 Expected results: mail is delivered to the local recipient. Additional info: $ ls -laZ /usr/lib/cyrus-imapd/deliver lrwxrwxrwx. 1 root root system_u:object_r:lib_t:s0 18 Jul 30 23:08 /usr/lib/cyrus-imapd/deliver -> ../../sbin/deliver $ ls -laZ /usr/sbin/deliver -rwxr-xr-x. 1 root root system_u:object_r:bin_t:s0 41504 Jul 30 23:08 /usr/sbin/deliver ls -laZ /usr/sbin/exim -rwsr-xr-x. 1 root root system_u:object_r:exim_exec_t:s0 1307196 Sep 30 14:28 /usr/sbin/exim
At startup $ sudo exim -bd -q15m -d+all everything works fine.
Hi Айфф, So is it working for you fine? Could we close the bug? Thanks, Lukas
No, it doesn't work, I had to create new rules through audit2allow and semodule.
Allow exim to execute bin_t without domain trans Allow exim_t - Mail transfer agent, to execute generic programs in system bin directories (/bin, /sbin, /usr/bin,/usr/sbin) a without domain transition.
It seems to me that giving exim access to all these directories is not a good idea.
In these directories are binary files installed via rpm packages. We allowed only executing these binaries but there will be domain transition to another (e.g: more loose) SELinux domain. This operation is quite usual.
selinux-policy-3.14.4-44.fc31 has been pushed to the Fedora 31 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2020-397eea28b7
selinux-policy-3.14.4-44.fc31 has been pushed to the Fedora 31 stable repository. If problems still persist, please make note of it in this bug report.