From e7d37585ac38cfef5f1d1f2c54b357c38757536a Mon Sep 17 00:00:00 2001
From: David Vallee Delisle <dvd@redhat.com>
Date: Thu, 8 Apr 2021 11:54:34 -0400
Subject: [PATCH] Missing client certificate for live-migration with TLS

TLS client verification used to be accidentally disabled in libvirt.
This was fixed in libvirt-6.10.0-1[1].
Which means, once you're using libvirt-6.10.0-1 or higher, a client
certificate is mandatory during live migration with TLS.

In this case, the server certificate generated by TripleO is valid
for client _and_ server:

                 Key Purpose (not critical):
                         TLS WWW Server.
                         TLS WWW Client.

So most deployments can re-use the same certificate for client and
server.  Why?  Because if both migration ends points are located
on the same infrastructure, it is reasonable to use the same
certificate for both client and server roles.

Introducing QemuDefaultTLSVerify parameter

This parameter will allow operators to enable or disable TLS client
certificate verification. Enabling this option will reject any client
who does not have a certificate signed by the CA in
/etc/pki/qemu/ca-cert.pem.

The default is true and matches libvirt's. We will want to disable this
by default in train.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1879477#c3

Depends-On: https://review.opendev.org/c/openstack/puppet-nova/+/785957/
Related: https://bugzilla.redhat.com/show_bug.cgi?id=1945760
Change-Id: I3b252854a0dbf121d69bab79543561da6be781f4
---
 deployment/nova/nova-libvirt-container-puppet.yaml     | 10 ++++++++++
 .../introducing-qemutlsverify-af590e0243fe6b08.yaml    |  9 +++++++++
 2 files changed, 19 insertions(+)
 create mode 100644 releasenotes/notes/introducing-qemutlsverify-af590e0243fe6b08.yaml

diff --git a/deployment/nova/nova-libvirt-container-puppet.yaml b/deployment/nova/nova-libvirt-container-puppet.yaml
index fa48950288..d67eb9533b 100644
--- a/deployment/nova/nova-libvirt-container-puppet.yaml
+++ b/deployment/nova/nova-libvirt-container-puppet.yaml
@@ -229,6 +229,13 @@ parameters:
     description: The password for the libvirt service when TLS is enabled
     type: string
     hidden: true
+  QemuDefaultTLSVerify:
+    description: >
+      Whether to enable or disable TLS client certificate verification. Enabling this
+      option will reject any client who does not have a certificate signed by the CA
+      in /etc/pki/qemu/ca-cert.pem
+    default: true
+    type: boolean
   LibvirtLogFilters:
     description: Defines a filter in libvirt daemon to select a different
                  logging level for a given category log outputs, as specified
@@ -435,6 +442,7 @@ outputs:
               -
                 tripleo::profile::base::nova::migration::client::libvirt_tls: true
                 tripleo::profile::base::nova::libvirt::tls_password: {get_param: [LibvirtTLSPassword]}
+                nova::compute::libvirt::qemu::default_tls_verify: {get_param: QemuDefaultTLSVerify}
                 nova::compute::libvirt::tls_priority: {get_param: LibvirtTLSPriority}
                 nova::migration::libvirt::listen_address:
                   str_replace:
@@ -630,6 +638,8 @@ outputs:
                                 - get_param: LibvirtNbdCACert
                       - /etc/pki/qemu/server-cert.pem:/etc/pki/qemu/server-cert.pem:ro
                       - /etc/pki/qemu/server-key.pem:/etc/pki/qemu/server-key.pem:ro
+                      - /etc/pki/qemu/server-cert.pem:/etc/pki/qemu/client-cert.pem:ro
+                      - /etc/pki/qemu/server-key.pem:/etc/pki/qemu/client-key.pem:ro
                     - null
                 -
                   if:
diff --git a/releasenotes/notes/introducing-qemutlsverify-af590e0243fe6b08.yaml b/releasenotes/notes/introducing-qemutlsverify-af590e0243fe6b08.yaml
new file mode 100644
index 0000000000..db13663a0d
--- /dev/null
+++ b/releasenotes/notes/introducing-qemutlsverify-af590e0243fe6b08.yaml
@@ -0,0 +1,9 @@
+---
+features:
+  - |
+    `QemuDefaultTLSVerify` will allow operators to enable or disable TLS client
+    certificate verification. Enabling this option will reject any client
+    who does not have a certificate signed by the CA in
+    /etc/pki/qemu/ca-cert.pem.
+    The default is true and matches libvirt's. We will want to disable this
+    by default in train.