[pbs-devel] [PATCH storage] pbs: allow setting up a master key
Fabian Grünbichler
f.gruenbichler at proxmox.com
Fri Feb 5 16:35:27 CET 2021
similar to the existing encryption key handling, but without
auto-generation since we only have the public part here.
Signed-off-by: Fabian Grünbichler <f.gruenbichler at proxmox.com>
---
requires a versioned dep on PBS client supporting these features.
PVE/API2/Storage/Config.pm | 2 +-
PVE/CLI/pvesm.pm | 14 +++++-
PVE/Storage/PBSPlugin.pm | 89 +++++++++++++++++++++++++++++++++++++-
3 files changed, 101 insertions(+), 4 deletions(-)
diff --git a/PVE/API2/Storage/Config.pm b/PVE/API2/Storage/Config.pm
index 00abd13..ea655c5 100755
--- a/PVE/API2/Storage/Config.pm
+++ b/PVE/API2/Storage/Config.pm
@@ -112,7 +112,7 @@ __PACKAGE__->register_method ({
return &$api_storage_config($cfg, $param->{storage});
}});
-my $sensitive_params = [qw(password encryption-key)];
+my $sensitive_params = [qw(password encryption-key master-pubkey)];
__PACKAGE__->register_method ({
name => 'create',
diff --git a/PVE/CLI/pvesm.pm b/PVE/CLI/pvesm.pm
index 3594774..fe147d9 100755
--- a/PVE/CLI/pvesm.pm
+++ b/PVE/CLI/pvesm.pm
@@ -6,6 +6,7 @@ use warnings;
use POSIX qw(O_RDONLY O_WRONLY O_CREAT O_TRUNC);
use Fcntl ':flock';
use File::Path;
+use MIME::Base64 qw(encode_base64);
use PVE::SafeSyslog;
use PVE::Cluster;
@@ -50,13 +51,22 @@ sub param_mapping {
}
};
+ my $master_key_map = {
+ name => 'master-pubkey',
+ desc => 'a file containing a PEM-formatted master public key',
+ func => sub {
+ my ($value) = @_;
+ return encode_base64(PVE::Tools::file_get_contents($value), '');
+ }
+ };
+
my $mapping = {
'cifsscan' => [ $password_map ],
'cifs' => [ $password_map ],
'pbs' => [ $password_map ],
- 'create' => [ $password_map, $enc_key_map ],
- 'update' => [ $password_map, $enc_key_map ],
+ 'create' => [ $password_map, $enc_key_map, $master_key_map ],
+ 'update' => [ $password_map, $enc_key_map, $master_key_map ],
};
return $mapping->{$name};
}
diff --git a/PVE/Storage/PBSPlugin.pm b/PVE/Storage/PBSPlugin.pm
index 6c6816e..ba6e197 100644
--- a/PVE/Storage/PBSPlugin.pm
+++ b/PVE/Storage/PBSPlugin.pm
@@ -8,6 +8,7 @@ use warnings;
use Fcntl qw(F_GETFD F_SETFD FD_CLOEXEC);
use IO::File;
use JSON;
+use MIME::Base64 qw(decode_base64);
use POSIX qw(strftime ENOENT);
use PVE::APIClient::LWP;
@@ -43,6 +44,10 @@ sub properties {
description => "Encryption key. Use 'autogen' to generate one automatically without passphrase.",
type => 'string',
},
+ 'master-pubkey' => {
+ description => "Public part of a master key pair. An encrypted copy of the encryption-key will be added to each encrypted backup.",
+ type => 'string',
+ },
port => {
description => "For non default port.",
type => 'integer',
@@ -64,6 +69,7 @@ sub options {
username => { optional => 1 },
password => { optional => 1 },
'encryption-key' => { optional => 1 },
+ 'master-pubkey' => { optional => 1 },
maxfiles => { optional => 1 },
'prune-backups' => { optional => 1 },
fingerprint => { optional => 1 },
@@ -153,6 +159,56 @@ sub pbs_open_encryption_key {
return $keyfd;
}
+sub pbs_master_pubkey_file_name {
+ my ($scfg, $storeid) = @_;
+
+ return "/etc/pve/priv/storage/${storeid}.master.pem";
+}
+
+sub pbs_set_master_pubkey {
+ my ($scfg, $storeid, $key) = @_;
+
+ my $pwfile = pbs_master_pubkey_file_name($scfg, $storeid);
+ mkdir "/etc/pve/priv/storage";
+
+ PVE::Tools::file_set_contents($pwfile, "$key\n");
+}
+
+sub pbs_delete_master_pubkey {
+ my ($scfg, $storeid) = @_;
+
+ my $pwfile = pbs_master_pubkey_file_name($scfg, $storeid);
+
+ if (!unlink $pwfile) {
+ return if $! == ENOENT;
+ die "failed to delete master public key! $!\n";
+ }
+ delete $scfg->{'master-pubkey'};
+}
+
+sub pbs_get_master_pubkey {
+ my ($scfg, $storeid) = @_;
+
+ my $pwfile = pbs_master_pubkey_file_name($scfg, $storeid);
+
+ return PVE::Tools::file_get_contents($pwfile);
+}
+
+# Returns a file handle if there is a master key, or `undef` if there is not. Dies on error.
+sub pbs_open_master_pubkey {
+ my ($scfg, $storeid) = @_;
+
+ my $master_pubkey_file = pbs_master_pubkey_file_name($scfg, $storeid);
+
+ my $keyfd;
+ if (!open($keyfd, '<', $master_pubkey_file)) {
+ return undef if $! == ENOENT;
+ die "failed to open master public key: $master_pubkey_file: $!\n";
+ }
+
+ return $keyfd;
+}
+
sub print_volid {
my ($storeid, $btype, $bid, $btime) = @_;
@@ -188,7 +244,7 @@ my sub do_raw_client_cmd {
push @$cmd, $client_exe, $client_cmd;
# This must live in the top scope to not get closed before the `run_command`
- my $keyfd;
+ my ($keyfd, $master_fd);
if ($use_crypto) {
if (defined($keyfd = pbs_open_encryption_key($scfg, $storeid))) {
my $flags = fcntl($keyfd, F_GETFD, 0)
@@ -196,6 +252,13 @@ my sub do_raw_client_cmd {
fcntl($keyfd, F_SETFD, $flags & ~FD_CLOEXEC)
or die "failed to remove FD_CLOEXEC from encryption key file descriptor\n";
push @$cmd, '--crypt-mode=encrypt', '--keyfd='.fileno($keyfd);
+ if (defined($master_fd = pbs_open_master_pubkey($scfg, $storeid))) {
+ my $flags = fcntl($master_fd, F_GETFD, 0)
+ // die "failed to get file descriptor flags: $!\n";
+ fcntl($master_fd, F_SETFD, $flags & ~FD_CLOEXEC)
+ or die "failed to remove FD_CLOEXEC from master public key file descriptor\n";
+ push @$cmd, '--master-pubkey-fd='.fileno($master_fd);
+ }
} else {
push @$cmd, '--crypt-mode=none';
}
@@ -394,6 +457,17 @@ sub on_add_hook {
pbs_delete_encryption_key($scfg, $storeid);
}
+ if (defined(my $master_key = delete $param{'master-pubkey'})) {
+ die "'master-pubkey' can only be used together with 'encryption-key'\n"
+ if !defined($scfg->{'encryption-key'});
+
+ my $decoded = decode_base64($master_key);
+ pbs_set_master_pubkey($scfg, $storeid, $decoded);
+ $scfg->{'master-pubkey'} = 1;
+ } else {
+ pbs_delete_master_pubkey($scfg, $storeid);
+ }
+
return $res;
}
@@ -427,6 +501,18 @@ sub on_update_hook {
$scfg->{'encryption-key'} = $decoded_key->{fingerprint} || 1;
} else {
pbs_delete_encryption_key($scfg, $storeid);
+ delete $scfg->{'encryption-key'};
+ }
+ }
+
+ if (exists($param{'master-pubkey'})) {
+ if (defined(my $master_key = delete($param{'master-pubkey'}))) {
+ my $decoded = decode_base64($master_key);
+
+ pbs_set_master_pubkey($scfg, $storeid, $decoded);
+ $scfg->{'master-pubkey'} = 1;
+ } else {
+ pbs_delete_master_pubkey($scfg, $storeid);
}
}
@@ -438,6 +524,7 @@ sub on_delete_hook {
pbs_delete_password($scfg, $storeid);
pbs_delete_encryption_key($scfg, $storeid);
+ pbs_delete_master_pubkey($scfg, $storeid);
return;
}
--
2.20.1
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