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Bug 1758265 - Aide unusable because of SELinux
Summary: Aide unusable because of SELinux
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.1
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: 8.2
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-10-03 17:25 UTC by Milos Malik
Modified: 2023-09-07 20:46 UTC (History)
7 users (show)

Fixed In Version: selinux-policy-3.14.3-22.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1758140
Environment:
Last Closed: 2020-04-28 16:41:25 UTC
Type: ---
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-28012 0 None None None 2023-09-07 20:46:33 UTC
Red Hat Product Errata RHBA-2020:1773 0 None None None 2020-04-28 16:41:38 UTC

Description Milos Malik 2019-10-03 17:25:29 UTC 
+++ This bug was initially created as a clone of Bug #1758140 +++

+++ This bug was initially created as a clone of Bug #1599382 +++

Description of problem:
SELinux prevents aide from checking hundreds of files.

Version-Release number of selected component (if applicable):
aide-0.16-11.el8.x86_64
selinux-policy-3.14.3-20.el8.noarch
selinux-policy-targeted-3.14.3-20.el8.noarch

Steps to reproduce:
1) get a RHEL-8 machine (targeted policy is active)
2) initialize the AIDE database
# /usr/sbin/aide -c /etc/aide.conf --init
3) run the aide check via a cronjob
* * * * * root /usr/sbin/aide --check --config=/etc/aide.conf

Following errors appear in /var/log/aide/aide.log:
get_file_status: lstat() failed for /etc/udev/rules.d/.null: Permission denied

If /etc/aide.conf is unchanged then the scenario triggers following SELinux denial:
----
type=PROCTITLE msg=audit(10/03/2019 12:08:03.340:840) : proctitle=/usr/sbin/aide --check --config=/etc/aide.conf 
type=SYSCALL msg=audit(10/03/2019 12:08:03.340:840) : arch=x86_64 syscall=lstat success=no exit=EACCES(Permission denied) a0=0x5579f6da6870 a1=0x7ffdb3fa60d0 a2=0x7ffdb3fa60d0 a3=0x17 items=0 ppid=12405 pid=12407 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=33 comm=aide exe=/usr/sbin/aide subj=system_u:system_r:aide_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(10/03/2019 12:08:03.340:840) : avc:  denied  { getattr } for  pid=12407 comm=aide path=/etc/udev/rules.d/.null dev="vda1" ino=732146 scontext=system_u:system_r:aide_t:s0-s0:c0.c1023 tcontext=system_u:object_r:udev_rules_t:s0 tclass=chr_file permissive=0 
----

If /etc/aide.conf is modified in such a way that /dev/ is checked, then hundreds of SELinux denials are triggered.
Comment 3 Lukas Vrabec 2019-10-04 08:38:29 UTC 
Radovan, 

Does it make sense that AIDE is checking also /dev ? 

Because aide is executed via cronjob, it's ends in aide_t SELinux domain and in aide policy it's not allowed to scan /dev. 

Thanks,
Lukas.
Comment 5 Lukas Vrabec 2019-10-04 11:53:22 UTC 
commit a61ed5047fa1782049c24f0f2953fb9cbe0c8264 (HEAD -> rhel8.2-contrib)
Author: Lukas Vrabec <lvrabec>
Date:   Fri Oct 4 13:39:16 2019 +0200

    Update aide_t domain to allow this tool to analyze also /dev filesystem
    
    Resolves: rhbz#1758265

commit ff3e1b1c8292b7694e44a28bfa45cec71a35dcaf (HEAD -> rhel8.2-base)
Author: Lukas Vrabec <lvrabec>
Date:   Fri Oct 4 13:31:53 2019 +0200

    Add new interface udev_getattr_rules_chr_files()
    
    Resolves: rhbz#1758265
Comment 13 errata-xmlrpc 2020-04-28 16:41:25 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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