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Bug 2143696 - [Regression] AVC reported when samba-dcerpcd tries to read Samba shares
Summary: [Regression] AVC reported when samba-dcerpcd tries to read Samba shares
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.7
Hardware: All
OS: Linux
high
high
Target Milestone: rc
: 8.8
Assignee: Zdenek Pytela
QA Contact: Milos Malik
Jan Fiala
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-11-17 15:01 UTC by Renaud Métrich
Modified: 2023-05-16 11:02 UTC (History)
16 users (show)

Fixed In Version: selinux-policy-3.14.3-113.el8
Doc Type: Bug Fix
Doc Text:
.The SELinux policy allows `smb` access to user shares Previously, the `samba-dcerpcd` process was separated from the `smb` service, but did not have access to user shares. As a consequence, `smb` clients could not access files on user `smb` shares. This update adds rules to the SELinux policy for managing user home content for the `samba-dcerpcd` binary when the `samba_enable_home_dirs` boolean is enabled. As a result, `samba-dcerpcd` can access user shares when `samba_enable_home_dirs` is on.
Clone Of:
Environment:
Last Closed: 2023-05-16 09:04:17 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-139804 0 None None None 2022-11-17 15:05:14 UTC
Red Hat Product Errata RHBA-2023:2965 0 None None None 2023-05-16 09:04:37 UTC

Internal Links: 2161998

Description Renaud Métrich 2022-11-17 15:01:13 UTC 
Description of problem:

This is new to 8.7.0. Since customer upgraded to 8.7.0 (from samba-4.15.5-8.el8_6 to samba-4.16.4-2.el8), he sees AVCs when the samba-dcerpcd helper executes:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
type=PROCTITLE msg=audit(11/14/2022 12:14:39.889:3440) : proctitle=/usr/libexec/samba/samba-dcerpcd --libexec-rpcds --ready-signal-fd=31 --np-helper --debuglevel=0
type=EXECVE msg=audit(11/14/2022 12:14:39.889:3440) : argc=5 a0=/usr/libexec/samba/samba-dcerpcd a1=--libexec-rpcds a2=--ready-signal-fd=31 a3=--np-helper a4=--debuglevel=0
type=SYSCALL msg=audit(11/14/2022 12:14:39.889:3440) : arch=x86_64 syscall=execve success=yes exit=0 ... items=0 ppid=329561 pid=329705 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=samba-dcerpcd exe=/usr/libexec/samba/samba-dcerpcd subj=system_u:system_r:winbind_rpcd_t:s0 key=(null)
type=AVC msg=audit(11/14/2022 12:14:39.889:3440) : avc:  denied  { ioctl } for  pid=329705 comm=samba-dcerpcd path=SAMBA_SHARE_DIR dev="dm-2" ino=6825702 scontext=system_u:system_r:winbind_rpcd_t:s0 tcontext=system_u:object_r:samba_share_t:s0 tclass=dir permissive=0

type=PROCTITLE msg=audit(11/14/2022 12:08:34.565:3437) : proctitle=/usr/libexec/samba/samba-dcerpcd --libexec-rpcds --ready-signal-fd=31 --np-helper --debuglevel=0
type=EXECVE msg=audit(11/14/2022 12:08:34.565:3437) : argc=5 a0=/usr/libexec/samba/samba-dcerpcd a1=--libexec-rpcds a2=--ready-signal-fd=31 a3=--np-helper a4=--debuglevel=0
type=SYSCALL msg=audit(11/14/2022 12:08:34.565:3437) : arch=x86_64 syscall=execve success=yes exit=0 ... items=0 ppid=329561 pid=329563 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=samba-dcerpcd exe=/usr/libexec/samba/samba-dcerpcd subj=system_u:system_r:winbind_rpcd_t:s0 key=(null)
type=AVC msg=audit(11/14/2022 12:08:34.565:3437) : avc:  denied  { read } for  pid=329563 comm=samba-dcerpcd path=SAMBA_SHARE_DIR/SAMBA_SHARE_FILE dev="dm-2" ino=6825716 scontext=system_u:system_r:winbind_rpcd_t:s0 tcontext=system_u:object_r:samba_share_t:s0 tclass=file permissive=0
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------

There was a massive redesign on the SELinux policy with RHEL8.7.0 regarding samba, in particular there is a new winbind_rpcd_t type (which is the faulty type here).
Please check what's going on here.

Version-Release number of selected component (if applicable):

samba-4.16.4-2.el8

How reproducible:

Always on customer system, didn't try to reproduce yet.
Comment 1 Tim Jackson 2022-11-30 21:02:19 UTC 
Possibly related (I'm not entirely sure if it's the same fix or not): bug #2122904
Comment 17 Robert Scheck 2023-04-17 21:36:26 UTC 
Is this going to cover samba_export_all_rw=1 as well, or really just samba_enable_home_dirs=1? CEE/GSS let me know that they added privately here that the issue also exists with samba_export_all_rw=1, but the doc text only mentions samba_enable_home_dirs=1 so far.
Comment 25 errata-xmlrpc 2023-05-16 09:04:17 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-2023:2965
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