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-rw-r--r--program/steps/mail/func.inc2
-rw-r--r--program/steps/mail/get.inc72
2 files changed, 69 insertions, 5 deletions
diff --git a/program/steps/mail/func.inc b/program/steps/mail/func.inc
index ff442ad60..cb1a5ddae 100644
--- a/program/steps/mail/func.inc
+++ b/program/steps/mail/func.inc
@@ -1664,7 +1664,7 @@ function rcmail_message_part_frame($attrib)
$part = $MESSAGE->mime_parts[asciiwords(get_input_value('_part', RCUBE_INPUT_GPC))];
$ctype_primary = strtolower($part->ctype_primary);
- $attrib['src'] = './?' . str_replace('_frame=', ($ctype_primary=='text' ? '_show=' : '_preload='), $_SERVER['QUERY_STRING']);
+ $attrib['src'] = './?' . str_replace('_frame=', ($ctype_primary=='text' ? '_embed=' : '_preload='), $_SERVER['QUERY_STRING']);
return html::iframe($attrib);
}
diff --git a/program/steps/mail/get.inc b/program/steps/mail/get.inc
index 2397358a1..71a5e1b02 100644
--- a/program/steps/mail/get.inc
+++ b/program/steps/mail/get.inc
@@ -112,6 +112,71 @@ else if (strlen($pid = get_input_value('_part', RCUBE_INPUT_GET))) {
// overwrite modified vars from plugin
$mimetype = $plugin['mimetype'];
+ $extensions = rcube_mime::get_mime_extensions($mimetype);
+
+ if ($plugin['body'])
+ $part->body = $plugin['body'];
+
+
+ // compare file mimetype with the stated content-type headers and file extension to avoid malicious operations
+ if (!empty($_REQUEST['_embed']) && empty($_REQUEST['_nocheck'])) {
+ $file_extension = strtolower(pathinfo($part->filename, PATHINFO_EXTENSION));
+
+ // 1. compare filename suffix with expected suffix derived from mimetype
+ $valid = $file_extension && in_array($file_extension, (array)$extensions);
+
+ // 2. detect the real mimetype of the attachment part and compare it with the stated mimetype and filename extension
+ if ($valid || !$file_extension || $mimetype == 'application/octet-stream') {
+ if ($part->body) // part body is already loaded
+ $body = $part->body;
+ else if ($part->size && $part->size < 1024*1024) // load the entire part if it's small enough
+ $body = $part->body = $MESSAGE->get_part_content($part->mime_id);
+ else // fetch the first 2K of the message part
+ $body = $MESSAGE->get_part_content($part->mime_id, null, true, 2048);
+
+ // detect message part mimetype
+ $real_mimetype = rcube_mime::file_content_type($body, $part->filename, $mimetype, true, true);
+ list($real_ctype_primary, $real_ctype_secondary) = explode('/', $real_mimetype);
+
+ // ignore differences in text/* mimetypes. Filetype detection isn't very reliable here
+ if ($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));
+
+ // fix mimetype for images wrongly declared as octet-stream
+ if ($mimetype == 'application/octet-stream' && strpos($real_mimetype, 'image/') === 0 && $valid_extension)
+ $mimetype = $real_mimetype;
+
+ $valid = ($real_mimetype == $mimetype && $valid_extension);
+ }
+ else {
+ $real_mimetype = $mimetype;
+ }
+
+ // show warning if validity checks failed
+ if (!$valid) {
+ $OUTPUT = new rcmail_html_page();
+ $OUTPUT->write(html::tag('html', null, html::tag('body', array('style' => 'font-family:sans-serif; margin:1em'),
+ html::div(array('class' => 'warning', 'style' => 'border:2px solid #ffdf0e; background:#fef893; padding:1em 1em 0 1em;'),
+ rcube_label(array(
+ 'name' => 'attachmentvalidationerror',
+ 'vars' => array('expected' => "$mimetype (.$file_extension)", 'detected' => "$real_mimetype (.$extensions[0])")
+ )) .
+ html::p('buttons',
+ html::tag('button', null,
+ html::a(array(
+ 'href' => $RCMAIL->url(array_merge($_GET, array('_nocheck' => 1))),
+ 'style' => 'text-decoration:none;color:#000',
+ ), rcube_label('showanyway')))
+ ))
+ )));
+ exit;
+ }
+ }
+
// TIFF to JPEG conversion, if needed
$tiff_support = !empty($_SESSION['browser_caps']) && !empty($_SESSION['browser_caps']['tif']);
@@ -123,11 +188,9 @@ else if (strlen($pid = get_input_value('_part', RCUBE_INPUT_GET))) {
$mimetype = 'image/jpeg';
}
- list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
- if ($plugin['body'])
- $part->body = $plugin['body'];
$browser = $RCMAIL->output->browser;
+ list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
// send download headers
if ($plugin['download']) {
@@ -144,6 +207,7 @@ else if (strlen($pid = get_input_value('_part', RCUBE_INPUT_GET))) {
header("Content-Transfer-Encoding: binary");
}
+
// deliver part content
if ($ctype_primary == 'text' && $ctype_secondary == 'html' && empty($plugin['download'])) {
// Check if we have enough memory to handle the message in it
@@ -166,7 +230,7 @@ else if (strlen($pid = get_input_value('_part', RCUBE_INPUT_GET))) {
check_storage_status();
}
- $OUTPUT = new rcube_output_html();
+ $OUTPUT = new rcube_html_page();
$OUTPUT->write($out);
}
else {