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From: Filip Schauer <f.schauer@proxmox.com>
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Date: Mon, 10 Feb 2025 16:37:33 +0100
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Subject: [pve-devel] [PATCH qemu-server v3 10/11] allow non-root users to
set /dev/u?random as an RNG source
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Allow non-root users with the VM.Config.HWType privilege to configure
/dev/urandom & /dev/random as an entropy source for a VirtIO RNG device.
/dev/hwrng remains restricted to the root user.
Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
---
PVE/API2/Qemu.pm | 43 +++++++++++++++++++++++++++++++++++++++++++
PVE/QemuServer.pm | 13 +++++++++++--
2 files changed, 54 insertions(+), 2 deletions(-)
diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index 295260e7..194e6357 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -38,6 +38,7 @@ use PVE::QemuServer::Memory qw(get_current_memory);
use PVE::QemuServer::MetaInfo;
use PVE::QemuServer::PCI;
use PVE::QemuServer::QMPHelpers;
+use PVE::QemuServer::RNG;
use PVE::QemuServer::USB;
use PVE::QemuMigrate;
use PVE::RPCEnvironment;
@@ -673,6 +674,7 @@ my $hwtypeoptions = {
'vga' => 1,
'watchdog' => 1,
'audio0' => 1,
+ 'rng0' => 1,
};
my $generaloptions = {
@@ -801,6 +803,36 @@ my sub check_vm_create_hostpci_perm {
return 1;
};
+my sub check_rng_perm {
+ my ($rpcenv, $authuser, $vmid, $pool, $opt, $value) = @_;
+
+ return 1 if $authuser eq 'root@pam';
+
+ $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.HWType']);
+
+ my $device = PVE::JSONSchema::parse_property_string('pve-qm-rng', $value);
+ if ($device->{source}) {
+ if ($device->{source} eq '/dev/hwrng') {
+ die "only root can set '$opt' config for a non-mapped Hardware RNG device\n";
+ }
+ }
+
+ return 1;
+}
+
+my sub check_vm_create_rng_perm {
+ my ($rpcenv, $authuser, $vmid, $pool, $param) = @_;
+
+ return 1 if $authuser eq 'root@pam';
+
+ foreach my $opt (keys %{$param}) {
+ next if $opt !~ m/^rng\d+$/;
+ check_rng_perm($rpcenv, $authuser, $vmid, $pool, $opt, $param->{$opt});
+ }
+
+ return 1;
+};
+
my $check_vm_modify_config_perm = sub {
my ($rpcenv, $authuser, $vmid, $pool, $key_list) = @_;
@@ -1114,6 +1146,7 @@ __PACKAGE__->register_method({
&$check_vm_create_serial_perm($rpcenv, $authuser, $vmid, $pool, $param);
check_vm_create_usb_perm($rpcenv, $authuser, $vmid, $pool, $param);
check_vm_create_hostpci_perm($rpcenv, $authuser, $vmid, $pool, $param);
+ check_vm_create_rng_perm($rpcenv, $authuser, $vmid, $pool, $param);
PVE::QemuServer::check_bridge_access($rpcenv, $authuser, $param);
&$check_cpu_model_access($rpcenv, $authuser, $param);
@@ -2005,6 +2038,10 @@ my $update_vm_api = sub {
check_hostpci_perm($rpcenv, $authuser, $vmid, undef, $opt, $val);
PVE::QemuConfig->add_to_pending_delete($conf, $opt, $force);
PVE::QemuConfig->write_config($vmid, $conf);
+ } elsif ($opt eq m/^rng\d+$/) {
+ check_rng_perm($rpcenv, $authuser, $vmid, undef, $opt, $val);
+ PVE::QemuConfig->add_to_pending_delete($conf, $opt, $force);
+ PVE::QemuConfig->write_config($vmid, $conf);
} elsif ($opt eq 'tags') {
assert_tag_permissions($vmid, $val, '', $rpcenv, $authuser);
delete $conf->{$opt};
@@ -2095,6 +2132,12 @@ my $update_vm_api = sub {
}
check_hostpci_perm($rpcenv, $authuser, $vmid, undef, $opt, $param->{$opt});
$conf->{pending}->{$opt} = $param->{$opt};
+ } elsif ($opt =~ m/^rng\d+$/) {
+ if (my $oldvalue = $conf->{$opt}) {
+ check_rng_perm($rpcenv, $authuser, $vmid, undef, $opt, $oldvalue);
+ }
+ check_rng_perm($rpcenv, $authuser, $vmid, undef, $opt, $param->{$opt});
+ $conf->{pending}->{$opt} = $param->{$opt};
} elsif ($opt eq 'tags') {
assert_tag_permissions($vmid, $conf->{$opt}, $param->{$opt}, $rpcenv, $authuser);
$conf->{pending}->{$opt} = PVE::GuestHelpers::get_unique_tags($param->{$opt});
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 70518924..cc69eeb1 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -6398,8 +6398,17 @@ sub check_mapping_access {
} else {
die "either 'host' or 'mapping' must be set.\n";
}
- }
- }
+ } elsif ($opt =~ m/^rng\d+$/) {
+ my $device = PVE::JSONSchema::parse_property_string('pve-qm-rng', $conf->{$opt});
+
+ if ($device->{source}) {
+ if ($device->{source} eq '/dev/hwrng') {
+ die "only root can set '$opt' config for a non-mapped Hardware RNG device\n"
+ if $user ne 'root@pam';
+ }
+ }
+ }
+ }
};
sub check_restore_permissions {
--
2.39.5
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