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Bug 2112395 - SELinux prevents samba-bgpd from talking to various sockets
Summary: SELinux prevents samba-bgpd from talking to various sockets
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: selinux-policy
Version: 9.1
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: 9.1
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-07-29 15:12 UTC by Denis Karpelevich
Modified: 2022-12-15 16:18 UTC (History)
5 users (show)

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
Clone Of:
: 2114737 (view as bug list)
Environment:
Last Closed: 2022-11-15 11:14:11 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github fedora-selinux selinux-policy pull 1314 0 None open Allow samba-bgqd get a printer list 2022-08-05 14:48:09 UTC
Red Hat Issue Tracker RHELPLAN-129686 0 None None None 2022-07-29 15:25:05 UTC
Red Hat Product Errata RHBA-2022:8283 0 None None None 2022-11-15 11:14:21 UTC

Comment 1 Zdenek Pytela 2022-07-29 15:55:07 UTC 
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
Comment 3 Andreas Schneider 2022-08-01 05:12:39 UTC 
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.
Comment 6 Milos Malik 2022-08-01 07:04:50 UTC 
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
Comment 9 Zdenek Pytela 2022-08-05 15:34:01 UTC 
Denis,

The issue will be addressed in Rawhide, RHEL 9.1 and 8.7. Are also some other releases affected?
Comment 19 errata-xmlrpc 2022-11-15 11:14:11 UTC 
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
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