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Merge pull request #703 from tcitworld/images_security

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Security fixes for downloaded images (thanks @leblanc-simon)
This commit is contained in:
tcitworld 2014-05-20 11:55:20 +02:00
commit 88f0e31622
2 changed files with 55 additions and 6 deletions
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3
inc/poche/config.inc.default.php
View file

@ -30,7 +30,8 @@
@define ('MODE_DEMO', FALSE);
@define ('DEBUG_POCHE', FALSE);
@define ('DOWNLOAD_PICTURES', FALSE);
@define ('DOWNLOAD_PICTURES', FALSE); # This can slow down the process of adding articles
@define ('REGENERATE_PICTURES_QUALITY', 75);
@define ('CONVERT_LINKS_FOOTNOTES', FALSE);
@define ('REVERT_FORCED_PARAGRAPH_ELEMENTS', FALSE);
@define ('SHARE_TWITTER', TRUE);

58
inc/poche/pochePictures.php
View file

@ -14,6 +14,7 @@
function filtre_picture($content, $url, $id)
{
$matches = array();
$processing_pictures = array(); // list of processing image to avoid processing the same pictures twice
preg_match_all('#<\s*(img)[^>]+src="([^"]*)"[^>]*>#Si', $content, $matches, PREG_SET_ORDER);
foreach($matches as $i => $link) {
$link[1] = trim($link[1]);
@ -22,8 +23,17 @@ function filtre_picture($content, $url, $id)
$filename = basename(parse_url($absolute_path, PHP_URL_PATH));
$directory = create_assets_directory($id);
$fullpath = $directory . '/' . $filename;
download_pictures($absolute_path, $fullpath);
$content = str_replace($matches[$i][2], $fullpath, $content);
if (in_array($absolute_path, $processing_pictures) === true) {
// replace picture's URL only if processing is OK : already processing -> go to next picture
continue;
}
if (download_pictures($absolute_path, $fullpath) === true) {
$content = str_replace($matches[$i][2], $fullpath, $content);
}
$processing_pictures[] = $absolute_path;
}
}
@ -64,17 +74,55 @@ function get_absolute_link($relative_link, $url) {
/**
* Téléchargement des images
*
* @return bool true if the download and processing is OK, false else
*/
function download_pictures($absolute_path, $fullpath)
{
$rawdata = Tools::getFile($absolute_path);
$fullpath = urldecode($fullpath);
if(file_exists($fullpath)) {
unlink($fullpath);
}
$fp = fopen($fullpath, 'x');
fwrite($fp, $rawdata);
fclose($fp);
// check extension
$file_ext = strrchr($fullpath, '.');
$whitelist = array(".jpg",".jpeg",".gif",".png");
if (!(in_array($file_ext, $whitelist))) {
Tools::logm('processed image with not allowed extension. Skipping ' . $fullpath);
return false;
}
// check headers
$imageinfo = getimagesize($absolute_path);
if ($imageinfo['mime'] != 'image/gif' && $imageinfo['mime'] != 'image/jpeg'&& $imageinfo['mime'] != 'image/jpg'&& $imageinfo['mime'] != 'image/png') {
Tools::logm('processed image with bad header. Skipping ' . $fullpath);
return false;
}
// regenerate image
$im = imagecreatefromstring($rawdata);
if ($im === false) {
Tools::logm('error while regenerating image ' . $fullpath);
return false;
}
switch ($imageinfo['mime']) {
case 'image/gif':
$result = imagegif($im, $fullpath);
break;
case 'image/jpeg':
case 'image/jpg':
$result = imagejpeg($im, $fullpath, REGENERATE_PICTURES_QUALITY);
break;
case 'image/png':
$result = imagepng($im, $fullpath, ceil(REGENERATE_PICTURES_QUALITY / 100 * 9));
break;
}
imagedestroy($im);
return $result;
}
/**