SELinux: allow logrotate to execute icinga2 binary

[yhabteab]

With the last security releases #10530 changed the logrotate config to use the icinga2 internal signal command to send the USR1 signal to the umbrella process, resulting rightfully in SELinux denials since this a confined executable. This PR allows the logrotate_t domain to be able to execute that bianry file. This might cause other SELinux deinials if the icinga2 internal command opens/reads some other Icinga 2 config files, but I'll test it tomorrow and share the results here.

time->Mon Nov  3 13:00:02 2025
type=PROCTITLE msg=audit(1762174802.598:899): proctitle=7368002D63000A09092F7573722F7362696E2F6963696E67613220696E7465726E616C207369676E616C202D2D7369672053494755535231202D2D70696420222428636174202F72756E2F6963696E6761322F6963696E6761322E70696420323E202F6465762F6E756C6C292220323E202F6465762F6E756C6C207C7C207472
type=SYSCALL msg=audit(1762174802.598:899): arch=c000003e syscall=21 success=no exit=-13 a0=56005035ab30 a1=4 a2=7ffc8efd9a40 a3=0 items=0 ppid=45588 pid=45591 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="sh" exe="/usr/bin/bash" subj=system_u:system_r:logrotate_t:s0 key=(null)
type=AVC msg=audit(1762174802.598:899): avc:  denied  { read } for  pid=45591 comm="sh" name="icinga2" dev="sda4" ino=8532185 scontext=system_u:system_r:logrotate_t:s0 tcontext=system_u:object_r:icinga2_exec_t:s0 tclass=file permissive=0
----
time->Mon Nov  3 14:00:00 2025
type=PROCTITLE msg=audit(1762178400.435:911): proctitle=7368002D63000A09092F7573722F7362696E2F6963696E67613220696E7465726E616C207369676E616C202D2D7369672053494755535231202D2D70696420222428636174202F72756E2F6963696E6761322F6963696E6761322E70696420323E202F6465762F6E756C6C292220323E202F6465762F6E756C6C207C7C207472
type=SYSCALL msg=audit(1762178400.435:911): arch=c000003e syscall=59 success=no exit=-13 a0=55e77ff91b30 a1=55e77ff914b0 a2=55e77ff8f690 a3=1b6 items=0 ppid=46418 pid=46421 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="sh" exe="/usr/bin/bash" subj=system_u:system_r:logrotate_t:s0 key=(null)
type=AVC msg=audit(1762178400.435:911): avc:  denied  { open } for  pid=46421 comm="sh" path="/usr/sbin/icinga2" dev="sda4" ino=8532185 scontext=system_u:system_r:logrotate_t:s0 tcontext=system_u:object_r:icinga2_exec_t:s0 tclass=file permissive=0

fixes #10616

[yhabteab]

but I'll test it tomorrow and share the results here.

Tested, works fine and causes no other SELinux denials!

[Al2Klimov]

Given su icinga icinga in our logrotate config and #10617, I'd just revert to /bin/kill. Dead simple. Neither additional policies, nor conditional rLimit needed. Just /bin/kill running under an unprivileged user, as previously.

[julianbrost]

Given su icinga icinga in our logrotate config

No, as already pointed out in #10527 (comment), that has no effect on postrotate (and other script commands).

[julianbrost]

Change looks sane and also worked on my test machine.

[yhabteab]

Please do not merge :). Would be nice if #10582 would be merged first, so that it can automatically backport it to the 2.15 support branch.

[julianbrost]

Huh? That shouldn't be related to merging the original PR? Shouldn't it be possible to trigger a backport after the PR was merged?

[yhabteab]

Huh? That shouldn't be related to merging the original PR? Shouldn't it be possible to trigger a backport after the PR was merged?

Not at the moment. Currently it only supports the closed + merged event. That way it will instantly backport PRs after merge.