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PacketEncoder: add minimal validation of fcgi packets on decode #78

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PacketEncoder: add minimal validation of fcgi packets on decode #78

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16 changes: 14 additions & 2 deletions src/Encoders/PacketEncoder.php
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@
namespace hollodotme\FastCGI\Encoders;

use hollodotme\FastCGI\Interfaces\EncodesPacket;
use hollodotme\FastCGI\Exceptions\ReadFailedException;
use function chr;
use function ord;
use function strlen;
Expand Down Expand Up @@ -58,9 +59,20 @@ public function encodePacket( int $type, string $content, int $requestId ) : str
*/
public function decodeHeader( string $data ) : array
{
if (strlen($data) < 7) {
throw new ReadFailedException( 'FCGI packet too short' );
}
$version = ord( $data[0] );
if ($version != 1) {
throw new ReadFailedException( 'Unsupported FCGI Version: ' . $version );
}
$type = ord( $data[1] );
if ($type > 11) { // FCGI_MAXTYPE
throw new ReadFailedException( 'Unsupported FCGI Packet type: ' . $type );
}
return [
'version' => ord( $data[0] ),
'type' => ord( $data[1] ),
'version' => $version,
'type' => $type,
'requestId' => (ord( $data[2] ) << 8) + ord( $data[3] ),
'contentLength' => (ord( $data[4] ) << 8) + ord( $data[5] ),
'paddingLength' => ord( $data[6] ),
Expand Down