[pve-devel] [PATCH v3 container 15/17] fix #2582: api: add checks for 'SuperUser' privilege for root-only options
Oguz Bektas
o.bektas at proxmox.com
Wed Apr 6 13:57:32 CEST 2022
this way we can allow regular users to act as superuser on specific
paths by giving them the (new) builtin 'SuperAdministrator' role or a
custom role with the 'SuperUser' privilege
Signed-off-by: Oguz Bektas <o.bektas at proxmox.com>
---
v2->v3:
* update comments
* drop shortcuts for 'root at pam', just check for SU privilege
src/PVE/API2/LXC.pm | 19 +++++++++----------
src/PVE/API2/LXC/Config.pm | 2 +-
src/PVE/API2/LXC/Status.pm | 12 ++++++++----
src/PVE/LXC.pm | 21 ++++++++++++---------
src/PVE/LXC/Create.pm | 2 +-
5 files changed, 31 insertions(+), 25 deletions(-)
diff --git a/src/PVE/API2/LXC.pm b/src/PVE/API2/LXC.pm
index ea4827f..4517b99 100644
--- a/src/PVE/API2/LXC.pm
+++ b/src/PVE/API2/LXC.pm
@@ -258,7 +258,7 @@ __PACKAGE__->register_method({
$skip_fw_config_restore = 1;
# error out if a user tries to change from unprivileged to privileged
- # explicit change is checked here, implicit is checked down below or happening in root-only paths
+ # explicit change is checked here, implicit is checked down below or happening in superuser-only paths
my $conf = PVE::LXC::Config->load_config($vmid);
if ($conf->{unprivileged} && defined($unprivileged) && !$unprivileged) {
raise_perm_exc("cannot change from unprivileged to privileged without VM.Allocate");
@@ -312,7 +312,7 @@ __PACKAGE__->register_method({
my $conf = {};
- my $is_root = $authuser eq 'root at pam';
+ my $is_superuser = $rpcenv->check($authuser, "/vms/$vmid", ['SuperUser'], 1);
my $no_disk_param = {};
my $mp_param = {};
@@ -347,8 +347,8 @@ __PACKAGE__->register_method({
my $mp = $mountpoint->{mp};
if ($mountpoint->{type} ne 'volume') { # bind or device
- die "Only root can pass arbitrary filesystem paths.\n"
- if !$is_root;
+ die "Only superusers can pass arbitrary filesystem paths.\n"
+ if !$is_superuser;
} else {
my ($sid, $volname) = PVE::Storage::parse_volume_id($volid);
&$check_and_activate_storage($sid);
@@ -384,11 +384,11 @@ __PACKAGE__->register_method({
$was_template = delete $orig_conf->{template};
- # When we're root call 'restore_configuration' with restricted=0,
+ # call 'restore_configuration' with restricted=0 when we have superuser,
# causing it to restore the raw lxc entries, among which there may be
# 'lxc.idmap' entries. We need to make sure that the extracted contents
# of the container match up with the restored configuration afterwards:
- $conf->{lxc} = $orig_conf->{lxc} if $is_root;
+ $conf->{lxc} = $orig_conf->{lxc} if $is_superuser;
$conf->{unprivileged} = $orig_conf->{unprivileged}
if !defined($unprivileged) && defined($orig_conf->{unprivileged});
@@ -422,8 +422,7 @@ __PACKAGE__->register_method({
my $type = $mountpoint->{type};
die "restoring rootfs to $type mount is only possible by specifying -rootfs manually!\n"
if ($ms eq 'rootfs');
- die "restoring '$ms' to $type mount is only possible for root\n"
- if !$is_root;
+ die "restoring '$ms' to $type mount is only possible for superusers\n" if !$is_superuser;
if ($mountpoint->{backup}) {
warn "WARNING - unsupported configuration!\n";
@@ -464,7 +463,7 @@ __PACKAGE__->register_method({
if ($restore) {
print "merging backed-up and given configuration..\n";
- PVE::LXC::Create::restore_configuration($vmid, $storage_cfg, $archive, $rootdir, $conf, !$is_root, $unique, $skip_fw_config_restore);
+ PVE::LXC::Create::restore_configuration($vmid, $storage_cfg, $archive, $rootdir, $conf, !$is_superuser, $unique, $skip_fw_config_restore);
my $lxc_setup = PVE::LXC::Setup->new($conf, $rootdir);
$lxc_setup->template_fixup($conf);
} else {
@@ -2224,7 +2223,7 @@ __PACKAGE__->register_method({
raise_param_exc({ 'target-vmid' => $msg, 'storage' => $msg });
} elsif ($target_vmid) {
$rpcenv->check_vm_perm($authuser, $target_vmid, undef, ['VM.Config.Disk'])
- if $authuser ne 'root at pam';
+ if $authuser ne 'root at pam'; # no need to check for root at pam
if ($vmid eq $target_vmid) {
my $msg = "must be different than source VMID to move disk to another container";
diff --git a/src/PVE/API2/LXC/Config.pm b/src/PVE/API2/LXC/Config.pm
index 1fec048..6278b8a 100644
--- a/src/PVE/API2/LXC/Config.pm
+++ b/src/PVE/API2/LXC/Config.pm
@@ -99,7 +99,7 @@ __PACKAGE__->register_method({
description => "Set container options.",
permissions => {
check => ['perm', '/vms/{vmid}', $vm_config_perm_list, any => 1],
- description => 'non-volume mount points in rootfs and mp[n] are restricted to root at pam',
+ description => 'non-volume mount points in rootfs and mp[n] are restricted to superusers',
},
parameters => {
additionalProperties => 0,
diff --git a/src/PVE/API2/LXC/Status.pm b/src/PVE/API2/LXC/Status.pm
index f7e3128..ecd77e5 100644
--- a/src/PVE/API2/LXC/Status.pm
+++ b/src/PVE/API2/LXC/Status.pm
@@ -150,9 +150,11 @@ __PACKAGE__->register_method({
my $node = extract_param($param, 'node');
my $vmid = extract_param($param, 'vmid');
+ 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';
+ raise_param_exc({ skiplock => "Only superusers may use this option." })
+ if $skiplock && !$is_superuser;
die "CT $vmid already running\n" if PVE::LXC::check_running($vmid);
@@ -234,9 +236,11 @@ __PACKAGE__->register_method({
my $node = extract_param($param, 'node');
my $vmid = extract_param($param, 'vmid');
+ 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';
+ raise_param_exc({ skiplock => "Only superusers may use this option." })
+ if $skiplock && !$is_superuser;
die "CT $vmid not running\n" if !PVE::LXC::check_running($vmid);
diff --git a/src/PVE/LXC.pm b/src/PVE/LXC.pm
index fe63087..c93b314 100644
--- a/src/PVE/LXC.pm
+++ b/src/PVE/LXC.pm
@@ -1254,7 +1254,10 @@ sub template_create {
sub check_ct_modify_config_perm {
my ($rpcenv, $authuser, $vmid, $pool, $oldconf, $newconf, $delete, $unprivileged) = @_;
- return 1 if $authuser eq 'root at pam';
+ return 1 if $authuser eq 'root at pam'; # early exit for root at pam
+
+ my $is_superuser = $rpcenv->check($authuser, "/vms/$vmid", ['SuperUser'], 1);
+
my $storage_cfg = PVE::Storage::config();
my $check = sub {
@@ -1265,8 +1268,8 @@ sub check_ct_modify_config_perm {
$rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.Disk']);
return if $delete;
my $data = PVE::LXC::Config->parse_volume($opt, $newconf->{$opt});
- raise_perm_exc("mount point type $data->{type} is only allowed for root\@pam")
- if $data->{type} ne 'volume';
+ raise_perm_exc("mount point type $data->{type} is only allowed for superusers")
+ if $data->{type} ne 'volume' && !$is_superuser;
my $volid = $data->{volume};
if ($volid =~ $NEW_DISK_RE) {
my $sid = $1;
@@ -1287,8 +1290,8 @@ sub check_ct_modify_config_perm {
$opt eq 'searchdomain' || $opt eq 'hostname') {
$rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.Network']);
} elsif ($opt eq 'features') {
- raise_perm_exc("changing feature flags for privileged container is only allowed for root\@pam")
- if !$unprivileged;
+ raise_perm_exc("changing feature flags for privileged container is only allowed for superusers")
+ if !$unprivileged && !$is_superuser;
my $nesting_changed = 0;
my $other_changed = 0;
@@ -1326,13 +1329,13 @@ sub check_ct_modify_config_perm {
$other_changed = 1;
}
}
- raise_perm_exc("changing feature flags (except nesting) is only allowed for root\@pam")
- if $other_changed;
+ raise_perm_exc("changing feature flags (except nesting) is only allowed for superusers")
+ if $other_changed && !$is_superuser;
$rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Allocate'])
if $nesting_changed;
} elsif ($opt eq 'hookscript') {
- # For now this is restricted to root at pam
- raise_perm_exc("changing the hookscript is only allowed for root\@pam");
+ raise_perm_exc("changing the hookscript is only allowed for superusers")
+ if !$is_superuser;
} else {
$rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.Options']);
}
diff --git a/src/PVE/LXC/Create.pm b/src/PVE/LXC/Create.pm
index 460df57..4602678 100644
--- a/src/PVE/LXC/Create.pm
+++ b/src/PVE/LXC/Create.pm
@@ -331,7 +331,7 @@ sub sanitize_and_merge_config {
if ($key eq 'lxc' && $restricted) {
my $lxc_list = $oldconf->{'lxc'};
- my $msg = "skipping custom lxc options, restore manually as root:\n";
+ my $msg = "skipping custom lxc options, restore manually as superuser:\n";
$msg .= "--------------------------------\n";
foreach my $lxc_opt (@$lxc_list) {
$msg .= "$lxc_opt->[0]: $lxc_opt->[1]\n"
--
2.30.2
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