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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
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 3Andreas 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.
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
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