+# VNC tickets
+# - they do not contain the username in plain text
+# - they are restricted to a specific resource path (example: '/vms/100')
+sub assemble_vnc_ticket {
+ my ($username, $path) = @_;
+
+ my $rsa_priv = get_privkey();
+
+ my $timestamp = sprintf("%08X", time());
+
+ my $plain = "PVEVNC:$timestamp";
+
+ $path = normalize_path($path);
+
+ my $full = "$plain:$username:$path";
+
+ my $ticket = $plain . "::" . encode_base64($rsa_priv->sign($full), '');
+
+ return $ticket;
+}
+
+sub verify_vnc_ticket {
+ my ($ticket, $username, $path, $noerr) = @_;
+
+ if ($ticket && $ticket =~ m/^(PVEVNC:\S+)::([^:\s]+)$/) {
+ my $plain = $1;
+ my $sig = $2;
+ my $full = "$plain:$username:$path";
+
+ my $rsa_pub = get_pubkey();
+ # Note: sign only match if $username and $path is correct
+ if ($rsa_pub->verify($full, decode_base64($sig))) {
+ if ($plain =~ m/^PVEVNC:([A-Z0-9]{8})$/) {
+ my $ttime = hex($1);
+
+ my $age = time() - $ttime;
+
+ if (($age > -20) && ($age < 40)) {
+ return 1;
+ }
+ }
+ }
+ }
+
+ die "permission denied - invalid vnc ticket\n" if !$noerr;
+
+ return undef;
+}
+
+