| | |
| | | $file_extension = strtolower(pathinfo($part->filename, PATHINFO_EXTENSION)); |
| | | |
| | | // 1. compare filename suffix with expected suffix derived from mimetype |
| | | $valid = $file_extension && in_array($file_extension, (array)$extensions) || !empty($_REQUEST['_mimeclass']); |
| | | $valid = $file_extension && in_array($file_extension, (array)$extensions) || empty($extensions) || !empty($_REQUEST['_mimeclass']); |
| | | |
| | | // 2. detect the real mimetype of the attachment part and compare it with the stated mimetype and filename extension |
| | | if ($valid || !$file_extension || $mimetype == 'application/octet-stream' || stripos($mimetype, 'text/') === 0) { |
| | |
| | | |
| | | // accept text/plain with any extension |
| | | if ($real_mimetype == 'text/plain' && $real_mimetype == $mimetype) { |
| | | $file_extension = 'txt'; |
| | | } |
| | | |
| | | // ignore differences in text/* mimetypes. Filetype detection isn't very reliable here |
| | | if ($real_ctype_primary == 'text' && strpos($mimetype, $real_ctype_primary) === 0) { |
| | | $real_mimetype = $mimetype; |
| | | } |
| | | |
| | | // get valid file extensions |
| | | $extensions = rcube_mime::get_mime_extensions($real_mimetype); |
| | | $valid_extension = (!$file_extension || in_array($file_extension, (array)$extensions)); |
| | | |
| | | // ignore filename extension if mimeclass matches (#1489029) |
| | | if (!empty($_REQUEST['_mimeclass']) && $real_ctype_primary == $_REQUEST['_mimeclass']) { |
| | | $valid_extension = true; |
| | | } |
| | | // ignore differences in text/* mimetypes. Filetype detection isn't very reliable here |
| | | else if ($real_ctype_primary == 'text' && strpos($mimetype, $real_ctype_primary) === 0) { |
| | | $real_mimetype = $mimetype; |
| | | $valid_extension = true; |
| | | } |
| | | // ignore filename extension if mimeclass matches (#1489029) |
| | | else if (!empty($_REQUEST['_mimeclass']) && $real_ctype_primary == $_REQUEST['_mimeclass']) { |
| | | $valid_extension = true; |
| | | } |
| | | else { |
| | | // get valid file extensions |
| | | $extensions = rcube_mime::get_mime_extensions($real_mimetype); |
| | | $valid_extension = !$file_extension || empty($extensions) || in_array($file_extension, (array)$extensions); |
| | | } |
| | | |
| | | // fix mimetype for images wrongly declared as octet-stream |
| | |
| | | $mimetype = $real_mimetype; |
| | | } |
| | | |
| | | $valid = ($real_mimetype == $mimetype && $valid_extension); |
| | | // "fix" real mimetype the same way the original is before comparison |
| | | $real_mimetype = rcmail_fix_mimetype($real_mimetype); |
| | | |
| | | $valid = $real_mimetype == $mimetype && $valid_extension; |
| | | } |
| | | else { |
| | | $real_mimetype = $mimetype; |