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Bug 2178612

Summary: Add a SELinux boolean which allows qemu guest agent to write SSH keys
Product: Red Hat Enterprise Linux 9 Reporter: Andrej Krejcir <akrejcir>
Component: selinux-policyAssignee: Nikola Knazekova <nknazeko>
Status: CLOSED ERRATA QA Contact: Milos Malik <mmalik>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 9.2CC: demeng, lvrabec, mmalik, mtessun, nknazeko, ovasik, pvlasin, sgott, zpytela
Target Milestone: rcKeywords: Triaged
Target Release: ---Flags: pm-rhel: mirror+
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: selinux-policy-38.1.9-1.el9_2 Doc Type: Enhancement
Doc Text:
Feature: Add SELinux boolean to allow qemu guest agent to manage SSH keys Reason: QEMU Guest Agent 5.2.0 added some new features including commands for managing guest ssh keys. Result: QEMU Guest Agent can manage ssh home directory by enabling the virt_qemu_ga_manage_ssh SELinux boolean.
 Story Points: ---
Clone Of:
: 2179027 (view as bug list) Environment:
Last Closed: 2023-05-09 08:17:18 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2179027    

Description Andrej Krejcir 2023-03-15 12:30:04 UTC 
Description of problem:

By default selinux blocks qemu guest agent from accessing SSH key files.
Currently there is a boolean to allow reading keys "virt_qemu_ga_read_ssh", but there is no boolean to allow writing keys.

Version-Release number of selected component (if applicable):
selinux-policy  38.1.8-1.el9 

How reproducible:
100%

Steps to Reproduce:
1. Start a VM with RHEL 9.2 guest image. I've used "rhel-guest-image-9.2-20230220.9.x86_64.qcow2"

virt-customize -a rhel-9.2.qcow2 \
  --ssh-inject root \
  --root-password password:pass123 \
  --uninstall cloud-init \
  --connect qemu:///system

virt-install --name test-vm \
  --vcpus 2 \
  --cpu host \
  --memory 2048 \
  --rng /dev/urandom \
  --disk rhel-9.2.qcow2 \
  --os-variant=rhel9.0 \
  --import \
  --boot uefi \
  --noautoconsole \
  --connect qemu:///system


2. Try to set SSH keys using qemu guest agent.
virsh -c qemu:///system set-user-sshkeys test-vm root --file ~/.ssh/id_rsa.pub

Fails with error message:
error: internal error: unable to execute QEMU agent command 'guest-ssh-add-authorized-keys': failed to write to '/root/.ssh/authorized_keys': Failed to create file “/root/.ssh/authorized_keys.SUES11”: Permission denied


Additional info:

Reading the keys fails similarly, if the "virt_qemu_ga_read_ssh" boolean is not set in the guest.

virsh -c qemu:///system get-user-sshkeys test-vm root

fails with:
error: internal error: unable to execute QEMU agent command 'guest-ssh-get-authorized-keys': failed to read '/root/.ssh/authorized_keys': Failed to open file “/root/.ssh/authorized_keys”: Permission denied


After the boolean is set,

virsh -c qemu:///system get-user-sshkeys test-vm root

Succeeds and prints the key.
Comment 21 errata-xmlrpc 2023-05-09 08:17:18 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-2023:2483