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Bug 2009769 - DBus unable to send_msg to cloud-init when "sudo" or "su" is used in cloud-init "user-data" scripts
Summary: DBus unable to send_msg to cloud-init when "sudo" or "su" is used in cloud-in...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.4
Hardware: Unspecified
OS: Linux
medium
medium
Target Milestone: rc
: 8.6
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-10-01 14:19 UTC by Stepan Broz
Modified: 2024-03-25 18:17 UTC (History)
4 users (show)

Fixed In Version: selinux-policy-3.14.3-84.el8
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-05-10 15:15:05 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-98677 0 None None None 2021-10-01 14:51:53 UTC
Red Hat Knowledge Base (Solution) 5692661 0 None None None 2021-10-01 14:25:34 UTC
Red Hat Product Errata RHBA-2022:1995 0 None None None 2022-05-10 15:15:23 UTC

Description Stepan Broz 2021-10-01 14:19:43 UTC 
Description of problem:


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


How reproducible:
Always

Steps to Reproduce:
1. Download KVM Guest Image from:
    https://access.redhat.com/downloads/content/479/ver=/rhel---8/8.4/x86_64/product-software

2.Place it in "/var/lib/libvirt/images/rhel-guest-image-8.4-992.x86_64.qcow2"

3. Create cidata.iso using the steps below:

    # mkdir ci; cd ci
    # vi meta-data
--8<--------8<--------8<--------8<--------8<--------8<--------8<--------8<------
instance-id: foobar
local-hostname: foobar.example.com
--8<--------8<--------8<--------8<--------8<--------8<--------8<--------8<------

    # vi user-data
--8<--------8<--------8<--------8<--------8<--------8<--------8<--------8<------
#cloud-config
password: redhat
chpasswd: { expire: False }
ssh_pwauth: True
ssh_authorized_keys:
   - <place_your_SSH_pubkey_here>
runcmd:
   - su - -c date >~/testfile
--8<--------8<--------8<--------8<--------8<--------8<--------8<--------8<------

    # mkisofs -o /var/lib/libvirt/images/cidata.iso -J -R -V cidata .

4. Create a new VM using rhel-guest-image-8.4-992.x86_64.qcow2 as disk drive and cidata.iso as a CD-ROM, boot it.


Actual results:
Extra 25 seconds delay with SELinux enabled and enforcing, AVC denial in audit.log as follows:

type=USER_AVC msg=audit(1633097673.446:66): pid=652 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { send_msg } for msgtype=method_return dest=:1.19 spid=723 tpid=1434 scontext=system_u:system_r:systemd_logind_t:s0 tcontext=system_u:system_r:cloud_init_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'UID="dbus" AUID="unset" SAUID="dbus"

Expected results:
No AVC, no extra delay.

Additional info:
https://access.redhat.com/solutions/5692661

Suggests:
--8<--------8<--------8<--------8<--------8<--------8<--------8<--------8<------

policy_module(cloud_init_sudo, 1.0)

gen_require(`
type cloud_init_t;
type systemd_logind_t;
class dbus send_msg;
')

allow systemd_logind_t cloud_init_t:dbus send_msg;
allow cloud_init_t systemd_logind_t:dbus send_msg;

--8<--------8<--------8<--------8<--------8<--------8<--------8<--------8<------
Comment 1 Patrik Koncity 2021-10-20 09:55:23 UTC 
Hi Stepan, 

please can you reproduce the scenario again and attach here full AVC's messages in permissive mode?

Steps to enable full auditing and permissive SELinux mode:

1) Open the /etc/audit/rules.d/audit.rules file in an editor.
2) Remove the following line if it exists:
-a task,never
3) Add the following line to the end of the file:
-w /etc/shadow -p w
4) Restart the audit daemon:
  # service auditd restart
5) Open the /etc/selinux/config file in an editor.
change line
SELINUX=enforcing
to
SELINUX=permissive
6) Re-run your scenario 
7) Collect AVC denials:
# ausearch -i -m avc,user_avc,selinux_err,user_selinux_err -ts today

Thank you,
Patrik
Comment 2 Stepan Broz 2021-11-04 14:00:02 UTC 
Unfortunately the reproducer uses a vanilla guest image, as taken from the customer portal, that I am unable to modify. (guestfish fails to mount the image read-write)
cloud-init does not run the second time post-install, I believe.

I cannot provide the data you requested.
Comment 4 Zdenek Pytela 2021-11-25 11:15:13 UTC 
(In reply to Stepan Broz from comment #2)
> Unfortunately the reproducer uses a vanilla guest image, as taken from the
> customer portal, that I am unable to modify. (guestfish fails to mount the
> image read-write)
> cloud-init does not run the second time post-install, I believe.
> 
> I cannot provide the data you requested.

Stepane,

The new policy build is on the way, we will however hardly be able to test a complex scenario similar enough to the customer's environment, so there is a risk the fix is not complete. Do you think they will be able to test the selinux-policy package?
Comment 5 Stepan Broz 2021-11-25 11:18:18 UTC 
I will do my test and will follow-up with the customer, no worries!

Just let me know when it's ready.
Comment 12 errata-xmlrpc 2022-05-10 15:15:05 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 (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-2022:1995
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