Bug 2112395
| Summary: | SELinux prevents samba-bgpd from talking to various sockets | |||
|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 9 | Reporter: | Denis Karpelevich <dkarpele> | |
| Component: | selinux-policy | Assignee: | Zdenek Pytela <zpytela> | |
| Status: | CLOSED ERRATA | QA Contact: | Milos Malik <mmalik> | |
| Severity: | medium | Docs Contact: | ||
| Priority: | medium | |||
| Version: | 9.1 | CC: | asn, lvrabec, mmalik, nknazeko, ssekidde | |
| Target Milestone: | rc | Keywords: | AutoVerified, Triaged | |
| Target Release: | 9.1 | Flags: | pm-rhel:
mirror+
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| Hardware: | All | |||
| OS: | Linux | |||
| Whiteboard: | ||||
| Fixed In Version: | selinux-policy-34.1.40-1.el9 | Doc Type: | Bug Fix | |
| Doc Text: |
Cause: When `rpcclient localhost -c 'enumprinters'` or a similar command is executed, SELinux prevents samba-bgqd connects to the cups service to get the list of configured printers.
Consequence: Test is working only in Permissive mode.
Fix: Allow samba-bgqd get a printer list
Result: No AVC denials
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Story Points: | --- | |
| Clone Of: | ||||
| : | 2114737 (view as bug list) | Environment: | ||
| Last Closed: | 2022-11-15 11:14:11 UTC | Type: | Bug | |
| Regression: | --- | Mount Type: | --- | |
| Documentation: | --- | CRM: | ||
| Verified Versions: | Category: | --- | ||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | ||
| Cloudforms Team: | --- | Target Upstream Version: | ||
| Embargoed: | ||||
When you do e.g. `rpcclient localhost -c 'enumprinters'` we will connect to cups to scan the printers which are configured. The printers are cached and we try to update them regularly. Steps that I used to reproduce the issue: 0) get a RHEL-9.1 machine (targeted policy is active) 1) install various samba and cups packages 2) start the smb, nmb, winbind, cups services 3) # smbpasswd -a 4) # rpcclient localhost -c 'enumprinters' 5) # ausearch -m avc -m user_avc -m selinux_err -i -ts today Denis, The issue will be addressed in Rawhide, RHEL 9.1 and 8.7. Are also some other releases affected? Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (selinux-policy bug fix and enhancement update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2022:8283 |
Denis, Do you happen to know which action takes place here? This is the denial interpreted: ---- type=PROCTITLE msg=audit(07/29/2022 11:01:59.156:2037) : proctitle=/usr/libexec/samba/samba-bgqd --ready-signal-fd=17 --parent-watch-fd=0 --debuglevel=0 -F type=AVC msg=audit(07/29/2022 11:01:59.156:2037) : avc: denied { read } for pid=23653 comm=samba-bgqd name=cups.sock dev="tmpfs" ino=1442 scontext=system_u:system_r:winbind_rpcd_t:s0 tcontext=system_u:object_r:cupsd_var_run_t:s0 tclass=sock_file permissive=0 type=SYSCALL msg=audit(07/29/2022 11:01:59.156:2037) : arch=x86_64 syscall=access success=no exit=EACCES(Permission denied) a0=0x7f4ebaa79812 a1=R_OK a2=0x4 a3=0xffffffff items=0 ppid=23651 pid=23653 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=samba-bgqd exe=/usr/libexec/samba/samba-bgqd subj=system_u:system_r:winbind_rpcd_t:s0 key=(null) rhel91# ls -lZ /usr/libexec/samba/samba-bgqd