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Bug 2083509 - samba-dcerpcd and samba rpcd programs need selinux-policy permissions
Summary: samba-dcerpcd and samba rpcd programs need selinux-policy permissions
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: 2083504
Blocks: 2083511
TreeView+ depends on / blocked
 
Reported: 2022-05-10 09:30 UTC by Pavel Filipensky
Modified: 2022-12-15 16:18 UTC (History)
6 users (show)

Fixed In Version: selinux-policy-34.1.34-1.el9
Doc Type: No Doc Update
Doc Text:
Clone Of: 2083504
: 2083511 (view as bug list)
Environment:
Last Closed: 2022-11-15 11:13:50 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github fedora-selinux selinux-policy pull 1219 0 None Merged Add support for samba-dcerpcd 2022-06-09 07:50:17 UTC
Github fedora-selinux selinux-policy pull 1227 0 None open Update policy for samba-dcerpcd 2022-06-09 07:50:17 UTC
Red Hat Issue Tracker RHELPLAN-121543 0 None None None 2022-05-10 10:04:09 UTC
Red Hat Product Errata RHBA-2022:8283 0 None None None 2022-11-15 11:14:09 UTC

Description Pavel Filipensky 2022-05-10 09:30:05 UTC 
+++ This bug was initially created as a clone of Bug #2083504 +++

After RHEL 9.1 rebase to samba 4.16.1 the samba test fails because of missing selinux policy permissions. Samba has added new programs (Release Notes https://www.samba.org/samba/history/samba-4.16.0.html).

Please give the needed permissions to these programs:

# ls -lZ /usr/libexec/samba/
lrwxrwxrwx. 1 root root system_u:object_r:bin_t:s0      34 Apr 23  2021 cups_backend_smb -> /etc/alternatives/cups_backend_smb
-rwxr-xr-x  1 root root ?                          1428008 Feb 15 12:31 rpcd_classic
-rwxr-xr-x  1 root root ?                            45168 Feb 15 12:31 rpcd_epmapper
-rwxr-xr-x  1 root root ?                            78104 Feb 15 12:31 rpcd_fsrvp
-rwxr-xr-x  1 root root ?                           424552 Feb 15 12:31 rpcd_lsad
-rwxr-xr-x  1 root root ?                           128712 Feb 15 12:31 rpcd_mdssvc
-rwxr-xr-x  1 root root ?                            28768 Feb 15 12:31 rpcd_rpcecho
-rwxr-xr-x  1 root root ?                           512976 Feb 15 12:31 rpcd_spoolss
-rwxr-xr-x  1 root root ?                            90712 Feb 15 12:31 rpcd_winreg
-rwxr-xr-x  1 root root ?                           525464 Feb 15 12:31 samba-bgqd
-rwxr-xr-x  1 root root ?                           197960 Feb 15 12:31 samba-dcerpcd


The denied access is here:


avc:  denied  { write } for  pid=53381 comm="samba-dcerpcd" name="samba-dcerpcd.pid" dev="tmpfs"
avc:  denied  { setgid } for  pid=53485 comm="rpcd_lsad"


and here:


type=AVC msg=audit(1652102482.309:2296): avc:  denied  { setgid } for  pid=52973 comm="rpcd_lsad" capability=6  scontext=system_u:system_r:winbind_t:s0 tcontext=system_u:system_r:winbind_t:s0 tclass=capability permissive=0            
type=AVC msg=audit(1652102482.934:2300): avc:  denied  { setgid } for  pid=52995 comm="rpcd_lsad" capability=6  scontext=system_u:system_r:winbind_t:s0 tcontext=system_u:system_r:winbind_t:s0 tclass=capability permissive=0
type=AVC msg=audit(1652102483.579:2304): avc:  denied  { setgid } for  pid=53015 comm="rpcd_lsad" capability=6  scontext=system_u:system_r:winbind_t:s0 tcontext=system_u:system_r:winbind_t:s0 tclass=capability permissive=0
type=AVC msg=audit(1652102484.263:2308): avc:  denied  { setgid } for  pid=53035 comm="rpcd_lsad" capability=6  scontext=system_u:system_r:winbind_t:s0 tcontext=system_u:system_r:winbind_t:s0 tclass=capability permissive=0
type=AVC msg=audit(1652102484.985:2312): avc:  denied  { setgid } for  pid=53056 comm="rpcd_lsad" capability=6  scontext=system_u:system_r:winbind_t:s0 tcontext=system_u:system_r:winbind_t:s0 tclass=capability permissive=0


Full logs:


http://idm-artifacts.usersys.redhat.com/samba/Nightly/RHEL8.7/2022-04-17/tier-1/tier1_ws2019/7/tier1-restraint.01/recipes/1/tasks/10/results/1652101918/logs/avc.log
http://idm-artifacts.usersys.redhat.com/samba/Nightly/RHEL8.7/2022-04-17/tier-1/tier1_ws2019/7/tier1-restraint.01/recipes/1/tasks/10/results/1652101914/logs/avc.log

--- Additional comment from Pavel Filipensky on 2022-05-10 09:27:54 UTC ---

The denied access: denied  { write } for  pid=53381 comm="samba-dcerpcd" name="samba-dcerpcd.pid" dev="tmpfs"
needs to be fixed via granting access for "/run"  (for pid files) - see smb.conf(5):

   pid directory (G)

       This option specifies the directory where pid files will be placed.

       Default: pid directory = /run

       Example: pid directory = /var/run/
Comment 1 Milos Malik 2022-05-10 13:54:08 UTC 
Steps to Reproduce:

1) get a RHEL-9.1 machine (targeted policy is active)
2) install the latest samba* packages (4.16.1-100.el9)
3) start the winbind service
4) search for SELinux denials

Following SELinux denial appears multiple times in enforcing mode:
----
type=PROCTITLE msg=audit(05/10/2022 09:49:34.292:416) : proctitle=/usr/libexec/samba/rpcd_lsad --configfile=/etc/samba/smb.conf --worker-group=4 --worker-index=5 --debuglevel=0 
type=SYSCALL msg=audit(05/10/2022 09:49:34.292:416) : arch=x86_64 syscall=setgroups success=no exit=EPERM(Operation not permitted) a0=0x0 a1=0x0 a2=0x7f3e02e7042b a3=0x0 items=0 ppid=16774 pid=16784 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rpcd_lsad exe=/usr/libexec/samba/rpcd_lsad subj=system_u:system_r:winbind_t:s0 key=(null) 
type=AVC msg=audit(05/10/2022 09:49:34.292:416) : avc:  denied  { setgid } for  pid=16784 comm=rpcd_lsad capability=setgid  scontext=system_u:system_r:winbind_t:s0 tcontext=system_u:system_r:winbind_t:s0 tclass=capability permissive=0 
----

# rpm -qa selinux\* \*samba\* | sort
python3-samba-4.16.1-100.el9.x86_64
samba-4.16.1-100.el9.x86_64
samba-client-libs-4.16.1-100.el9.x86_64
samba-common-4.16.1-100.el9.noarch
samba-common-libs-4.16.1-100.el9.x86_64
samba-common-tools-4.16.1-100.el9.x86_64
samba-libs-4.16.1-100.el9.x86_64
samba-winbind-4.16.1-100.el9.x86_64
samba-winbind-modules-4.16.1-100.el9.x86_64
selinux-policy-34.1.30-2.el9.noarch
selinux-policy-targeted-34.1.30-2.el9.noarch
#
Comment 2 Milos Malik 2022-05-10 13:57:02 UTC 
Following SELinux denial appears in permissive mode:
----
type=PROCTITLE msg=audit(05/10/2022 09:54:47.582:459) : proctitle=/usr/libexec/samba/rpcd_lsad --configfile=/etc/samba/smb.conf --worker-group=5 --worker-index=5 --debuglevel=0 
type=SYSCALL msg=audit(05/10/2022 09:54:47.582:459) : arch=x86_64 syscall=setgroups success=yes exit=0 a0=0x0 a1=0x0 a2=0x7fbd9328942b a3=0x0 items=0 ppid=16893 pid=16903 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rpcd_lsad exe=/usr/libexec/samba/rpcd_lsad subj=system_u:system_r:winbind_t:s0 key=(null) 
type=AVC msg=audit(05/10/2022 09:54:47.582:459) : avc:  denied  { setgid } for  pid=16903 comm=rpcd_lsad capability=setgid  scontext=system_u:system_r:winbind_t:s0 tcontext=system_u:system_r:winbind_t:s0 tclass=capability permissive=1 
----
Comment 4 Zdenek Pytela 2022-06-07 18:35:11 UTC 
To backport:
commit 7367896085db099d956d666b94601fa9fc9df92a
Author: Zdenek Pytela <zpytela>
Date:   Wed Jun 1 12:55:02 2022 +0200

    Add support for samba-dcerpcd
Comment 5 Zdenek Pytela 2022-06-09 09:05:34 UTC 
Additional one:
commit 044ed83f8ebde938bbc49f6e071a8548ddc8505d (HEAD -> rawhide, upstream/rawhide)
Author: Zdenek Pytela <zpytela>
Date:   Wed Jun 8 16:24:15 2022 +0200

    Update policy for samba-dcerpcd
Comment 16 errata-xmlrpc 2022-11-15 11:13:50 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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