[pve-devel] [PATCH v4 qemu-server 06/18] api: allow SU privileged users to edit root-only options for VM configs

[Oguz Bektas]

we now allow users with SU privilege to edit real device configurations
for VMs.

they still need the required privilege to edit the corresponding
configuration options (e.g. `VM.Config.HWType`), as well as the SU
privilege.

Co-authored-by: Fabian Grünbichler <f.gruenbichler at proxmox.com>
Signed-off-by: Oguz Bektas <o.bektas at proxmox.com>
---
v3->v4:
* added fabian's tag there as well since he helped me a lot with this part


 PVE/API2/Qemu.pm | 62 ++++++++++++++++++++++++------------------------
 1 file changed, 31 insertions(+), 31 deletions(-)

diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index 99b426e..2e75ab6 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -545,16 +545,17 @@ my $cloudinitoptions = {
 my $check_vm_create_serial_perm = sub {
     my ($rpcenv, $authuser, $vmid, $pool, $param) = @_;
 
+    # no need to check permissions for root at pam
     return 1 if $authuser eq 'root at pam';
 
+    my $is_superuser = $rpcenv->check($authuser, "/vms/$vmid", ['SuperUser'], 1);
+
     foreach my $opt (keys %{$param}) {
 	next if $opt !~ m/^serial\d+$/;
 
-	if ($param->{$opt} eq 'socket') {
-	    $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.HWType']);
-	} else {
-	    die "only root can set '$opt' config for real devices\n";
-	}
+	$rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.HWType']);
+	die "only superusers can set '$opt' config for real devices\n"
+	    if $param->{$opt} ne 'socket' && !$is_superuser;
     }
 
     return 1;
@@ -563,16 +564,17 @@ my $check_vm_create_serial_perm = sub {
 my $check_vm_create_usb_perm = sub {
     my ($rpcenv, $authuser, $vmid, $pool, $param) = @_;
 
+    # no need to check permissions for root at pam
     return 1 if $authuser eq 'root at pam';
 
+    my $is_superuser = $rpcenv->check($authuser, "/vms/$vmid", ['SuperUser'], 1);
+
     foreach my $opt (keys %{$param}) {
 	next if $opt !~ m/^usb\d+$/;
 
-	if ($param->{$opt} =~ m/spice/) {
-	    $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.HWType']);
-	} else {
-	    die "only root can set '$opt' config for real devices\n";
-	}
+	$rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.HWType']);
+	die "only superusers can set '$opt' config for real devices\n"
+	    if $param->{$opt} !~ m/spice/ && !$is_superuser;
     }
 
     return 1;
@@ -581,8 +583,11 @@ my $check_vm_create_usb_perm = sub {
 my $check_vm_modify_config_perm = sub {
     my ($rpcenv, $authuser, $vmid, $pool, $key_list) = @_;
 
+    # no need to check permissions for root at pam
     return 1 if $authuser eq 'root at pam';
 
+    my $is_superuser = $rpcenv->check($authuser, "/vms/$vmid", ['SuperUser'], 1);
+
     foreach my $opt (@$key_list) {
 	# some checks (e.g., disk, serial port, usb) need to be done somewhere
 	# else, as there the permission can be value dependend
@@ -618,7 +623,8 @@ my $check_vm_modify_config_perm = sub {
 	} else {
 	    # catches hostpci\d+, args, lock, etc.
 	    # new options will be checked here
-	    die "only root can set '$opt' config\n";
+	    die "only superusers can set '$opt' config\n"
+		if !$is_superuser;
 	}
     }
 
@@ -1328,6 +1334,8 @@ my $update_vm_api  = sub {
 	push @paramarr, "-$key", $value;
     }
 
+    my $is_superuser = $rpcenv->check($authuser, "/vms/$vmid", ['SuperUser'], 1);
+
     my $skiplock = extract_param($param, 'skiplock');
     raise_param_exc({ skiplock => "Only root may use this option." })
 	if $skiplock && $authuser ne 'root at pam';
@@ -1544,19 +1552,15 @@ my $update_vm_api  = sub {
 		    PVE::QemuConfig->add_to_pending_delete($conf, $opt, $force);
 		    PVE::QemuConfig->write_config($vmid, $conf);
 		} elsif ($opt =~ m/^serial\d+$/) {
-		    if ($val eq 'socket') {
-			$rpcenv->check_vm_perm($authuser, $vmid, undef, ['VM.Config.HWType']);
-		    } elsif ($authuser ne 'root at pam') {
-			die "only root can delete '$opt' config for real devices\n";
-		    }
+		    $rpcenv->check_vm_perm($authuser, $vmid, undef, ['VM.Config.HWType']);
+		    die "only superusers can delete '$opt' config for real devices\n"
+			if $val ne 'socket' && !$is_superuser;
 		    PVE::QemuConfig->add_to_pending_delete($conf, $opt, $force);
 		    PVE::QemuConfig->write_config($vmid, $conf);
 		} elsif ($opt =~ m/^usb\d+$/) {
-		    if ($val =~ m/spice/) {
-			$rpcenv->check_vm_perm($authuser, $vmid, undef, ['VM.Config.HWType']);
-		    } elsif ($authuser ne 'root at pam') {
-			die "only root can delete '$opt' config for real devices\n";
-		    }
+		    $rpcenv->check_vm_perm($authuser, $vmid, undef, ['VM.Config.HWType']);
+		    die "only superusers can delete '$opt' config for real devices\n"
+			if $val !~ m/spice/ && !$is_superuser;
 		    PVE::QemuConfig->add_to_pending_delete($conf, $opt, $force);
 		    PVE::QemuConfig->write_config($vmid, $conf);
 		} else {
@@ -1606,18 +1610,14 @@ my $update_vm_api  = sub {
 			}
 		    }
 		} elsif ($opt =~ m/^serial\d+/) {
-		    if ((!defined($conf->{$opt}) || $conf->{$opt} eq 'socket') && $param->{$opt} eq 'socket') {
-			$rpcenv->check_vm_perm($authuser, $vmid, undef, ['VM.Config.HWType']);
-		    } elsif ($authuser ne 'root at pam') {
-			die "only root can modify '$opt' config for real devices\n";
-		    }
+		    $rpcenv->check_vm_perm($authuser, $vmid, undef, ['VM.Config.HWType']); # always check hw config
+		    die "only superusers can modify '$opt' config for real devices\n"
+			if !$is_superuser && ((defined($conf->{$opt}) && $conf->{$opt} ne 'socket') || $param->{$opt} ne 'socket');
 		    $conf->{pending}->{$opt} = $param->{$opt};
 		} elsif ($opt =~ m/^usb\d+/) {
-		    if ((!defined($conf->{$opt}) || $conf->{$opt} =~ m/spice/) && $param->{$opt} =~ m/spice/) {
-			$rpcenv->check_vm_perm($authuser, $vmid, undef, ['VM.Config.HWType']);
-		    } elsif ($authuser ne 'root at pam') {
-			die "only root can modify '$opt' config for real devices\n";
-		    }
+		    $rpcenv->check_vm_perm($authuser, $vmid, undef, ['VM.Config.HWType']);
+		    die "only superusers can modify '$opt' config for real devices\n"
+			if !$is_superuser && ((defined($conf->{$opt}) && $conf->{$opt} !~ m/spice/) || $param->{$opt} !~ m/spice/);
 		    $conf->{pending}->{$opt} = $param->{$opt};
 		} else {
 		    $conf->{pending}->{$opt} = $param->{$opt};
-- 
2.30.2