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From: Fiona Ebner <f.ebner@proxmox.com>
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Date: Wed, 4 Sep 2024 13:12:31 +0200
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Subject: [pve-devel] [PATCH v3 qemu-server] remote migration: fix online
migration via API clients
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As reported in the community forum [0], when a remote migration
request comes in via an API client, the -T flag for Perl is set, so an
insecure dependency in a call like unlink() in forward_unix_socket()
will fail with:
> failed to write forwarding command - Insecure dependency in unlink while running with -T switch
To fix it, untaint the problematic socket addresses coming from the
remote side. Require that all sockets are below '/run/qemu-server/'
and end with '.migrate' with the main socket being matched more
strictly. This allows extensions in the future while still being quite
strict.
[0]: https://forum.proxmox.com/threads/123048/post-691958
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---
Changes in v3:
* Match main socket address more strictly as suggested by Fabian.
PVE/QemuMigrate.pm | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/PVE/QemuMigrate.pm b/PVE/QemuMigrate.pm
index e71face4..6591f3f7 100644
--- a/PVE/QemuMigrate.pm
+++ b/PVE/QemuMigrate.pm
@@ -1095,7 +1095,9 @@ sub phase2 {
die "only UNIX sockets are supported for remote migration\n"
if $tunnel_info->{proto} ne 'unix';
- my $remote_socket = $tunnel_info->{addr};
+ # untaint
+ my ($remote_socket) = $tunnel_info->{addr} =~ m|^(/run/qemu-server/\d+\.migrate)$|
+ or die "unexpected socket address '$tunnel_info->{addr}'\n";
my $local_socket = $remote_socket;
$local_socket =~ s/$remote_vmid/$vmid/g;
$tunnel_info->{addr} = $local_socket;
@@ -1104,6 +1106,9 @@ sub phase2 {
PVE::Tunnel::forward_unix_socket($self->{tunnel}, $local_socket, $remote_socket);
foreach my $remote_socket (@{$tunnel_info->{unix_sockets}}) {
+ # untaint
+ ($remote_socket) = $remote_socket =~ m|^(/run/qemu-server/(?:(?!\.\./).)+\.migrate)$|
+ or die "unexpected socket address '$remote_socket'\n";
my $local_socket = $remote_socket;
$local_socket =~ s/$remote_vmid/$vmid/g;
next if $self->{tunnel}->{forwarded}->{$local_socket};
--
2.39.2
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