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Bug 1743907 - SELinux prevents sssd/p11_child from searching the /root/.config directory
Summary: SELinux prevents sssd/p11_child from searching the /root/.config directory
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.1
Hardware: All
OS: Linux
low
unspecified
Target Milestone: rc
: 8.2
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-08-20 23:47 UTC by Scott Poore
Modified: 2020-04-28 16:41 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-04-28 16:41:05 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2020:1773 0 None None None 2020-04-28 16:41:29 UTC

Description Scott Poore 2019-08-20 23:47:50 UTC 
Description of problem:

When performing some smart card authentications, sssd's p11_child triggers some AVC denials.  If there is no easy way to allow p11_child to skip this scan, these messages can probably be ignored.

[root@rhel8-2 ~]# ausearch -m avc -ts 18:30
----
time->Tue Aug 20 18:33:15 2019
type=PROCTITLE msg=audit(1566343995.622:207): proctitle=2F7573722F6C6962657865632F737373642F7031315F6368696C64002D2D64656275672D6D6963726F7365636F6E64733D30002D2D64656275672D74696D657374616D70733D31002D2D64656275672D66643D3233002D2D64656275672D6C6576656C3D307866376630002D2D707265002D2D766572696679006E6F5F6F6373
type=SYSCALL msg=audit(1566343995.622:207): arch=c000003e syscall=257 success=no exit=-13 a0=ffffff9c a1=55af9a82d8d0 a2=80000 a3=0 items=0 ppid=3436 pid=3468 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="p11_child" exe="/usr/libexec/sssd/p11_child" subj=system_u:system_r:sssd_t:s0 key=(null)
type=AVC msg=audit(1566343995.622:207): avc:  denied  { search } for  pid=3468 comm="p11_child" name=".config" dev="dm-0" ino=2856739 scontext=system_u:system_r:sssd_t:s0 tcontext=unconfined_u:object_r:config_home_t:s0 tclass=dir permissive=0
----
time->Tue Aug 20 18:33:15 2019
type=PROCTITLE msg=audit(1566343995.622:208): proctitle=2F7573722F6C6962657865632F737373642F7031315F6368696C64002D2D64656275672D6D6963726F7365636F6E64733D30002D2D64656275672D74696D657374616D70733D31002D2D64656275672D66643D3233002D2D64656275672D6C6576656C3D307866376630002D2D707265002D2D766572696679006E6F5F6F6373
type=SYSCALL msg=audit(1566343995.622:208): arch=c000003e syscall=257 success=no exit=-13 a0=ffffff9c a1=55af9a82d8d0 a2=90800 a3=0 items=0 ppid=3436 pid=3468 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="p11_child" exe="/usr/libexec/sssd/p11_child" subj=system_u:system_r:sssd_t:s0 key=(null)
type=AVC msg=audit(1566343995.622:208): avc:  denied  { search } for  pid=3468 comm="p11_child" name=".config" dev="dm-0" ino=2856739 scontext=system_u:system_r:sssd_t:s0 tcontext=unconfined_u:object_r:config_home_t:s0 tclass=dir permissive=0

[root@rhel8-2 ~]# ausearch -m avc -ts 18:30|audit2allow


#============= sssd_t ==============
allow sssd_t config_home_t:dir search;

[root@rhel8-2 ~]# find / -inum 2856739
/root/.config


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

selinux-policy-3.14.3-18.el8.noarch
sssd-2.2.0-16.el8.x86_64
p11-kit-0.23.14-5.el8_0.x86_64

How reproducible:
always

Steps to Reproduce:
1. Setup IPA Smart Card Authentication
2. Generate certificate for user and enroll smartcard
3. Authenticate with smartcard

Actual results:
AVC messages shown above

Expected results:
No AVC denials or warnings expected

Additional info:
Comment 1 Lukas Vrabec 2019-08-26 16:24:25 UTC 
This is good candidate for dontaudit rule.
Comment 11 errata-xmlrpc 2020-04-28 16:41:05 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, 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-2020:1773
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