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Bug 2060721 - SELinux prevents sssd from using the inotify_add_watch syscall on the /run/systemd/resolve directory
Summary: SELinux prevents sssd from using the inotify_add_watch syscall on the /run/sy...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: CentOS Stream
Hardware: x86_64
OS: Linux
low
low
Target Milestone: rc
: 8.7
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-03-04 05:50 UTC by Den Ivanov
Modified: 2022-11-08 12:20 UTC (History)
6 users (show)

Fixed In Version: selinux-policy-3.14.3-98.el8
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-11-08 10:43:57 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)
/etc/nsswitch.conf (1.72 KB, text/plain)
2022-03-04 07:45 UTC, Den Ivanov 		no flags Details
View All


Links
System ID Private Priority Status Summary Last Updated
Github fedora-selinux selinux-policy-contrib pull 215 0 None Merged Allow sssd read systemd-resolved runtime directory 2022-03-04 07:53:36 UTC
Red Hat Bugzilla 1811556 1 None None None 2022-03-04 07:53:36 UTC
Red Hat Issue Tracker RHELPLAN-114451 0 None None None 2022-03-04 05:53:56 UTC
Red Hat Product Errata RHBA-2022:7691 0 None None None 2022-11-08 10:44:18 UTC

Description Den Ivanov 2022-03-04 05:50:00 UTC 
Description of problem:
After upgrading to Centos Stream, a message about a denied operation appeared in the audit.log:

type=AVC msg=audit(1646364486.530:4801932): avc:  denied  { read } for  pid=1303548 comm="sssd" name="resolve" dev="tmpfs" ino=31832 scontext=system_u:system_r:sssd_t:s0 tcontext=system_u:object_r:systemd
_resolved_var_run_t:s0 tclass=dir permissive=0
type=SYSCALL msg=audit(1646364486.530:4801932): arch=c000003e syscall=254 success=no exit=-13 a0=0 a1=5637172b2d40 a2=180 a3=0 items=0 ppid=1 pid=1303548 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0
egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="sssd" exe="/usr/sbin/sssd" subj=system_u:system_r:sssd_t:s0 key=(null).ARCH=x86_64 SYSCALL=inotify_add_watch AUID="unset" UID="root" GID="root" EUID="
root" SUID="root" FSUID="root" EGID="root" SGID="root" FSGID="root"


Version-Release number of selected component (if applicable):
selinux-policy-3.14.3-93.el8.noarch
selinux-policy-targeted-3.14.3-93.el8.noarch

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:
# uname -a
Linux zzzzzzz.com 4.18.0-365.el8.x86_64 #1 SMP Thu Feb 10 16:11:23 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Comment 1 Milos Malik 2022-03-04 07:33:45 UTC 
Unfortunately, I'm not able to reproduce the situation.

Can you attach your /etc/nsswitch.conf file to this BZ?
If there are any files under the /etc/sssd directory on your machine, please attach them as well.

What I know is that the latest SELinux policy does not fix the SELinux denial in any way:

# rpm -qa selinux\*
selinux-policy-3.14.3-93.el8.noarch
selinux-policy-targeted-3.14.3-93.el8.noarch
# sesearch -s sssd_t -t systemd_resolved_var_run_t -c dir -p read -A --dontaudit
#

Thank you.
Comment 2 Den Ivanov 2022-03-04 07:45:42 UTC 
Created attachment 1864112 [details]
/etc/nsswitch.conf
Comment 3 Den Ivanov 2022-03-04 07:48:54 UTC 
(In reply to Milos Malik from comment #1)
> Unfortunately, I'm not able to reproduce the situation.
> 
> Can you attach your /etc/nsswitch.conf file to this BZ?
Attached /etc/nsswitch.conf

> If there are any files under the /etc/sssd directory on your machine, please
> attach them as well.
No files under /etc/sssd

> What I know is that the latest SELinux policy does not fix the SELinux
> denial in any way:
> 
> # rpm -qa selinux\*
> selinux-policy-3.14.3-93.el8.noarch
> selinux-policy-targeted-3.14.3-93.el8.noarch
> # sesearch -s sssd_t -t systemd_resolved_var_run_t -c dir -p read -A
> --dontaudit
This machine just migrated from CentOS Linux to Stream
Comment 4 Zdenek Pytela 2022-03-04 07:53:36 UTC 
It can be addressed by backporting the following commit:
commit 5406e9a4f4ae4a95e15fea717ccfa63fe4835264
Author: Zdenek Pytela <zpytela>
Date:   Mon Mar 9 10:24:18 2020 +0100

    Allow sssd read systemd-resolved runtime directory
Comment 5 Milos Malik 2022-03-04 07:56:43 UTC 
Following SELinux denial appeared in enforcing mode:
----
type=PROCTITLE msg=audit(03/04/2022 02:52:56.431:92) : proctitle=/usr/sbin/sssd -i --logger=files 
type=PATH msg=audit(03/04/2022 02:52:56.431:92) : item=0 name=/run/systemd/resolve inode=19565 dev=00:18 mode=dir,755 ouid=systemd-resolve ogid=systemd-resolve rdev=00:00 obj=system_u:object_r:systemd_resolved_var_run_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(03/04/2022 02:52:56.431:92) : cwd=/ 
type=SYSCALL msg=audit(03/04/2022 02:52:56.431:92) : arch=x86_64 syscall=inotify_add_watch success=no exit=EACCES(Permission denied) a0=0x0 a1=0x55606b5e2390 a2=0x180 a3=0x0 items=1 ppid=1 pid=1542 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=sssd exe=/usr/sbin/sssd subj=system_u:system_r:sssd_t:s0 key=(null) 
type=AVC msg=audit(03/04/2022 02:52:56.431:92) : avc:  denied  { read } for  pid=1542 comm=sssd name=resolve dev="tmpfs" ino=19565 scontext=system_u:system_r:sssd_t:s0 tcontext=system_u:object_r:systemd_resolved_var_run_t:s0 tclass=dir permissive=0 
----

I remember that /etc/resolv.conf can be a symbolic link in certain configurations:

# service systemd-resolved start
Redirecting to /bin/systemctl start systemd-resolved.service
# ls -l /etc/resolv.conf 
lrwxrwxrwx. 1 root root 32 Mar  4 02:52 /etc/resolv.conf -> /run/systemd/resolve/resolv.conf
# service sssd restart
Redirecting to /bin/systemctl restart sssd.service
#

Now, the issue is reproducible.
Comment 6 Milos Malik 2022-03-04 07:57:41 UTC 
Following SELinux denial appeared in permissive mode:
----
type=PROCTITLE msg=audit(03/04/2022 02:56:54.649:97) : proctitle=/usr/sbin/sssd -i --logger=files 
type=PATH msg=audit(03/04/2022 02:56:54.649:97) : item=0 name=/run/systemd/resolve inode=19565 dev=00:18 mode=dir,755 ouid=systemd-resolve ogid=systemd-resolve rdev=00:00 obj=system_u:object_r:systemd_resolved_var_run_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(03/04/2022 02:56:54.649:97) : cwd=/ 
type=SYSCALL msg=audit(03/04/2022 02:56:54.649:97) : arch=x86_64 syscall=inotify_add_watch success=yes exit=2 a0=0x0 a1=0x555bd734b390 a2=0x180 a3=0x0 items=1 ppid=1 pid=1573 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=sssd exe=/usr/sbin/sssd subj=system_u:system_r:sssd_t:s0 key=(null) 
type=AVC msg=audit(03/04/2022 02:56:54.649:97) : avc:  denied  { read } for  pid=1573 comm=sssd name=resolve dev="tmpfs" ino=19565 scontext=system_u:system_r:sssd_t:s0 tcontext=system_u:object_r:systemd_resolved_var_run_t:s0 tclass=dir permissive=1 
----
Comment 16 errata-xmlrpc 2022-11-08 10:43:57 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-2022:7691
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