[pve-devel] [PATCH v2 qemu-server 02/12] 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 (such as `VM.Config.HWType`), as well as the SU
privilege.

Signed-off-by: Oguz Bektas <o.bektas at proxmox.com>
---
v1->v2:
* add comments at the shortcuts for root at pam
* remove wrong shortcut for SU, instead check required privileges + SU
* revert migration-only parameters and vzdump internal ones


 PVE/API2/Qemu.pm | 63 ++++++++++++++++++++++++------------------------
 1 file changed, 32 insertions(+), 31 deletions(-)

diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index 68077cc..21fc82b 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -352,16 +352,17 @@ 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} eq 'socket' || $is_superuser);
     }
 
     return 1;
@@ -370,16 +371,17 @@ 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;
@@ -388,8 +390,11 @@ 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
@@ -425,7 +430,8 @@ 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;
 	}
     }
 
@@ -1117,6 +1123,8 @@ my $update_vm_api  = sub {
 	push @paramarr, "-$key", $value;
     }
 
+    my $is_superuser = $authuser eq 'root at pam' || $rpcenv->check($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';
@@ -1338,19 +1346,15 @@ 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 eq '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 {
@@ -1362,6 +1366,7 @@ my $update_vm_api  = sub {
 	    foreach my $opt (keys %$param) { # add/change
 		$modified->{$opt} = 1;
 		$conf = PVE::QemuConfig->load_config($vmid); # update/reload
+		my $val = $conf->{$opt} // $conf->{pending}->{$opt};
 		next if defined($conf->{pending}->{$opt}) && ($param->{$opt} eq $conf->{pending}->{$opt}); # skip if nothing changed
 
 		my $arch = PVE::QemuServer::get_vm_arch($conf);
@@ -1390,18 +1395,14 @@ 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, $vmid, undef, ['VM.Config.HWType']);
+		    die "only superusers can modify '$opt' config for real devices\n"
+			if !($val eq 'socket' || $is_superuser);
 		    $conf->{pending}->{$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 !($val =~ m/spice/ || $is_superuser);
 		    $conf->{pending}->{$opt} = $param->{$opt};
 		} else {
 		    $conf->{pending}->{$opt} = $param->{$opt};
-- 
2.30.2