diff options
Diffstat (limited to 'system/libraries/Upload.php')
| -rw-r--r-- | system/libraries/Upload.php | 562 |
1 files changed, 324 insertions, 238 deletions
diff --git a/system/libraries/Upload.php b/system/libraries/Upload.php index 8f324de79..d381440cd 100644 --- a/system/libraries/Upload.php +++ b/system/libraries/Upload.php @@ -1,64 +1,76 @@ -<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); +<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * - * An open source application development framework for PHP 5.1.6 or newer + * An open source application development framework for PHP 5.2.4 or newer + * + * NOTICE OF LICENSE + * + * Licensed under the Open Software License version 3.0 + * + * This source file is subject to the Open Software License (OSL 3.0) that is + * bundled with this package in the files license.txt / license.rst. It is + * also available through the world wide web at this URL: + * http://opensource.org/licenses/OSL-3.0 + * If you did not receive a copy of the license and are unable to obtain it + * through the world wide web, please send an email to + * licensing@ellislab.com so we can send you a copy immediately. * * @package CodeIgniter - * @author ExpressionEngine Dev Team - * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. - * @license http://codeigniter.com/user_guide/license.html + * @author EllisLab Dev Team + * @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/) + * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) * @link http://codeigniter.com * @since Version 1.0 * @filesource */ -// ------------------------------------------------------------------------ - /** * File Uploading Class * * @package CodeIgniter * @subpackage Libraries * @category Uploads - * @author ExpressionEngine Dev Team + * @author EllisLab Dev Team * @link http://codeigniter.com/user_guide/libraries/file_uploading.html */ class CI_Upload { - public $max_size = 0; - public $max_width = 0; - public $max_height = 0; - public $max_filename = 0; + public $max_size = 0; + public $max_width = 0; + public $max_height = 0; + public $max_filename = 0; public $max_filename_increment = 100; - public $allowed_types = ""; - public $file_temp = ""; - public $file_name = ""; - public $orig_name = ""; - public $file_type = ""; - public $file_size = ""; - public $file_ext = ""; - public $upload_path = ""; - public $overwrite = FALSE; - public $encrypt_name = FALSE; - public $is_image = FALSE; - public $image_width = ''; - public $image_height = ''; - public $image_type = ''; - public $image_size_str = ''; - public $error_msg = array(); - public $mimes = array(); - public $remove_spaces = TRUE; - public $xss_clean = FALSE; - public $temp_prefix = "temp_file_"; - public $client_name = ''; + public $allowed_types = ''; + public $file_temp = ''; + public $file_name = ''; + public $orig_name = ''; + public $file_type = ''; + public $file_size = ''; + public $file_ext = ''; + public $upload_path = ''; + public $overwrite = FALSE; + public $encrypt_name = FALSE; + public $is_image = FALSE; + public $image_width = ''; + public $image_height = ''; + public $image_type = ''; + public $image_size_str = ''; + public $error_msg = array(); + public $mimes = array(); + public $remove_spaces = TRUE; + public $detect_mime = TRUE; + public $xss_clean = FALSE; + public $temp_prefix = 'temp_file_'; + public $client_name = ''; protected $_file_name_override = ''; /** * Constructor * - * @access public + * @param array + * @return void */ public function __construct($props = array()) { @@ -67,7 +79,9 @@ class CI_Upload { $this->initialize($props); } - log_message('debug', "Upload Class Initialized"); + $this->mimes =& get_mimes(); + + log_message('debug', 'Upload Class Initialized'); } // -------------------------------------------------------------------- @@ -81,33 +95,33 @@ class CI_Upload { public function initialize($config = array()) { $defaults = array( - 'max_size' => 0, - 'max_width' => 0, - 'max_height' => 0, - 'max_filename' => 0, - 'max_filename_increment' => 100, - 'allowed_types' => "", - 'file_temp' => "", - 'file_name' => "", - 'orig_name' => "", - 'file_type' => "", - 'file_size' => "", - 'file_ext' => "", - 'upload_path' => "", - 'overwrite' => FALSE, - 'encrypt_name' => FALSE, - 'is_image' => FALSE, - 'image_width' => '', - 'image_height' => '', - 'image_type' => '', - 'image_size_str' => '', - 'error_msg' => array(), - 'mimes' => array(), - 'remove_spaces' => TRUE, - 'xss_clean' => FALSE, - 'temp_prefix' => "temp_file_", - 'client_name' => '' - ); + 'max_size' => 0, + 'max_width' => 0, + 'max_height' => 0, + 'max_filename' => 0, + 'max_filename_increment' => 100, + 'allowed_types' => '', + 'file_temp' => '', + 'file_name' => '', + 'orig_name' => '', + 'file_type' => '', + 'file_size' => '', + 'file_ext' => '', + 'upload_path' => '', + 'overwrite' => FALSE, + 'encrypt_name' => FALSE, + 'is_image' => FALSE, + 'image_width' => '', + 'image_height' => '', + 'image_type' => '', + 'image_size_str' => '', + 'error_msg' => array(), + 'remove_spaces' => TRUE, + 'detect_mime' => TRUE, + 'xss_clean' => FALSE, + 'temp_prefix' => 'temp_file_', + 'client_name' => '' + ); foreach ($defaults as $key => $val) @@ -144,8 +158,7 @@ class CI_Upload { */ public function do_upload($field = 'userfile') { - - // Is $_FILES[$field] set? If not, no reason to continue. + // Is $_FILES[$field] set? If not, no reason to continue. if ( ! isset($_FILES[$field])) { $this->set_error('upload_no_file_selected'); @@ -164,7 +177,7 @@ class CI_Upload { { $error = ( ! isset($_FILES[$field]['error'])) ? 4 : $_FILES[$field]['error']; - switch($error) + switch ($error) { case 1: // UPLOAD_ERR_INI_SIZE $this->set_error('upload_file_exceeds_limit'); @@ -187,18 +200,25 @@ class CI_Upload { case 8: // UPLOAD_ERR_EXTENSION $this->set_error('upload_stopped_by_extension'); break; - default : $this->set_error('upload_no_file_selected'); + default: + $this->set_error('upload_no_file_selected'); break; } return FALSE; } - // Set the uploaded data as class variables $this->file_temp = $_FILES[$field]['tmp_name']; $this->file_size = $_FILES[$field]['size']; - $this->file_type = preg_replace("/^(.+?);.*$/", "\\1", $_FILES[$field]['type']); + + // Skip MIME type detection? + if ($this->detect_mime !== FALSE) + { + $this->_file_mime_type($_FILES[$field]); + } + + $this->file_type = preg_replace('/^(.+?);.*$/', '\\1', $this->file_type); $this->file_type = strtolower(trim(stripslashes($this->file_type), '"')); $this->file_name = $this->_prep_filename($_FILES[$field]['name']); $this->file_ext = $this->get_extension($this->file_name); @@ -212,7 +232,7 @@ class CI_Upload { } // if we're overriding, let's now make sure the new name and type is allowed - if ($this->_file_name_override != '') + if ($this->_file_name_override !== '') { $this->file_name = $this->_prep_filename($this->_file_name_override); @@ -221,11 +241,10 @@ class CI_Upload { { $this->file_name .= $this->file_ext; } - - // An extension was provided, lets have it! else { - $this->file_ext = $this->get_extension($this->_file_name_override); + // An extension was provided, lets have it! + $this->file_ext = $this->get_extension($this->_file_name_override); } if ( ! $this->is_allowed_filetype(TRUE)) @@ -266,9 +285,9 @@ class CI_Upload { } // Remove white spaces in the name - if ($this->remove_spaces == TRUE) + if ($this->remove_spaces === TRUE) { - $this->file_name = preg_replace("/\s+/", "_", $this->file_name); + $this->file_name = preg_replace('/\s+/', '_', $this->file_name); } /* @@ -279,7 +298,7 @@ class CI_Upload { */ $this->orig_name = $this->file_name; - if ($this->overwrite == FALSE) + if ($this->overwrite === FALSE) { $this->file_name = $this->set_filename($this->upload_path, $this->file_name); @@ -292,23 +311,20 @@ class CI_Upload { /* * Run the file through the XSS hacking filter * This helps prevent malicious code from being - * embedded within a file. Scripts can easily + * embedded within a file. Scripts can easily * be disguised as images or other file types. */ - if ($this->xss_clean) + if ($this->xss_clean && $this->do_xss_clean() === FALSE) { - if ($this->do_xss_clean() === FALSE) - { - $this->set_error('upload_unable_to_write_file'); - return FALSE; - } + $this->set_error('upload_unable_to_write_file'); + return FALSE; } /* * Move the file to the final destination * To deal with different server configurations - * we'll attempt to use copy() first. If that fails - * we'll use move_uploaded_file(). One of the two should + * we'll attempt to use copy() first. If that fails + * we'll use move_uploaded_file(). One of the two should * reliably work in most environments */ if ( ! @copy($this->file_temp, $this->upload_path.$this->file_name)) @@ -323,7 +339,7 @@ class CI_Upload { /* * Set the finalized image dimensions * This sets the image width/height (assuming the - * file was an image). We use this information + * file was an image). We use this information * in the "data" function. */ $this->set_image_properties($this->upload_path.$this->file_name); @@ -339,26 +355,34 @@ class CI_Upload { * Returns an associative array containing all of the information * related to the upload, allowing the developer easy access in one array. * - * @return array + * @param string + * @return mixed */ - public function data() + public function data($index = NULL) { - return array ( - 'file_name' => $this->file_name, - 'file_type' => $this->file_type, - 'file_path' => $this->upload_path, - 'full_path' => $this->upload_path.$this->file_name, - 'raw_name' => str_replace($this->file_ext, '', $this->file_name), - 'orig_name' => $this->orig_name, - 'client_name' => $this->client_name, - 'file_ext' => $this->file_ext, - 'file_size' => $this->file_size, - 'is_image' => $this->is_image(), - 'image_width' => $this->image_width, - 'image_height' => $this->image_height, - 'image_type' => $this->image_type, - 'image_size_str' => $this->image_size_str, - ); + $data = array( + 'file_name' => $this->file_name, + 'file_type' => $this->file_type, + 'file_path' => $this->upload_path, + 'full_path' => $this->upload_path.$this->file_name, + 'raw_name' => str_replace($this->file_ext, '', $this->file_name), + 'orig_name' => $this->orig_name, + 'client_name' => $this->client_name, + 'file_ext' => $this->file_ext, + 'file_size' => $this->file_size, + 'is_image' => $this->is_image(), + 'image_width' => $this->image_width, + 'image_height' => $this->image_height, + 'image_type' => $this->image_type, + 'image_size_str' => $this->image_size_str, + ); + + if ( ! empty($index)) + { + return isset($data[$index]) ? $data[$index] : NULL; + } + + return $data; } // -------------------------------------------------------------------- @@ -390,7 +414,7 @@ class CI_Upload { */ public function set_filename($path, $filename) { - if ($this->encrypt_name == TRUE) + if ($this->encrypt_name === TRUE) { mt_srand(); $filename = md5(uniqid(mt_rand())).$this->file_ext; @@ -413,7 +437,7 @@ class CI_Upload { } } - if ($new_filename == '') + if ($new_filename === '') { $this->set_error('upload_bad_filename'); return FALSE; @@ -429,12 +453,12 @@ class CI_Upload { /** * Set Maximum File Size * - * @param integer + * @param int * @return void */ public function set_max_filesize($n) { - $this->max_size = ((int) $n < 0) ? 0: (int) $n; + $this->max_size = ((int) $n < 0) ? 0 : (int) $n; } // -------------------------------------------------------------------- @@ -442,12 +466,12 @@ class CI_Upload { /** * Set Maximum File Name Length * - * @param integer + * @param int * @return void */ public function set_max_filename($n) { - $this->max_filename = ((int) $n < 0) ? 0: (int) $n; + $this->max_filename = ((int) $n < 0) ? 0 : (int) $n; } // -------------------------------------------------------------------- @@ -455,12 +479,12 @@ class CI_Upload { /** * Set Maximum Image Width * - * @param integer + * @param int * @return void */ public function set_max_width($n) { - $this->max_width = ((int) $n < 0) ? 0: (int) $n; + $this->max_width = ((int) $n < 0) ? 0 : (int) $n; } // -------------------------------------------------------------------- @@ -468,12 +492,12 @@ class CI_Upload { /** * Set Maximum Image Height * - * @param integer + * @param int * @return void */ public function set_max_height($n) { - $this->max_height = ((int) $n < 0) ? 0: (int) $n; + $this->max_height = ((int) $n < 0) ? 0 : (int) $n; } // -------------------------------------------------------------------- @@ -486,7 +510,7 @@ class CI_Upload { */ public function set_allowed_types($types) { - if ( ! is_array($types) && $types == '*') + if ( ! is_array($types) && $types === '*') { $this->allowed_types = '*'; return; @@ -517,10 +541,10 @@ class CI_Upload { { $types = array(1 => 'gif', 2 => 'jpeg', 3 => 'png'); - $this->image_width = $D['0']; - $this->image_height = $D['1']; - $this->image_type = ( ! isset($types[$D['2']])) ? 'unknown' : $types[$D['2']]; - $this->image_size_str = $D['3']; // string containing height and width + $this->image_width = $D[0]; + $this->image_height = $D[1]; + $this->image_type = isset($types[$D[2]]) ? $types[$D[2]] : 'unknown'; + $this->image_size_str = $D[3]; // string containing height and width } } } @@ -538,7 +562,7 @@ class CI_Upload { */ public function set_xss_clean($flag = FALSE) { - $this->xss_clean = ($flag == TRUE) ? TRUE : FALSE; + $this->xss_clean = ($flag === TRUE); } // -------------------------------------------------------------------- @@ -560,19 +584,14 @@ class CI_Upload { { $this->file_type = 'image/png'; } - - if (in_array($this->file_type, $jpeg_mimes)) + elseif (in_array($this->file_type, $jpeg_mimes)) { $this->file_type = 'image/jpeg'; } - $img_mimes = array( - 'image/gif', - 'image/jpeg', - 'image/png', - ); + $img_mimes = array('image/gif', 'image/jpeg', 'image/png'); - return (in_array($this->file_type, $img_mimes, TRUE)) ? TRUE : FALSE; + return in_array($this->file_type, $img_mimes, TRUE); } // -------------------------------------------------------------------- @@ -580,16 +599,17 @@ class CI_Upload { /** * Verify that the filetype is allowed * + * @param bool * @return bool */ public function is_allowed_filetype($ignore_mime = FALSE) { - if ($this->allowed_types == '*') + if ($this->allowed_types === '*') { return TRUE; } - if (count($this->allowed_types) == 0 OR ! is_array($this->allowed_types)) + if ( ! is_array($this->allowed_types) OR count($this->allowed_types) === 0) { $this->set_error('upload_no_file_types'); return FALSE; @@ -605,12 +625,9 @@ class CI_Upload { // Images get some additional checks $image_types = array('gif', 'jpg', 'jpeg', 'png', 'jpe'); - if (in_array($ext, $image_types)) + if (in_array($ext, $image_types) && @getimagesize($this->file_temp) === FALSE) { - if (getimagesize($this->file_temp) === FALSE) - { - return FALSE; - } + return FALSE; } if ($ignore_mime === TRUE) @@ -620,16 +637,13 @@ class CI_Upload { $mime = $this->mimes_types($ext); - if (is_array($mime)) + if (is_array($mime) && in_array($this->file_type, $mime, TRUE)) { - if (in_array($this->file_type, $mime, TRUE)) - { - return TRUE; - } + return TRUE; } - elseif ($mime == $this->file_type) + elseif ($mime === $this->file_type) { - return TRUE; + return TRUE; } return FALSE; @@ -644,14 +658,7 @@ class CI_Upload { */ public function is_allowed_filesize() { - if ($this->max_size != 0 AND $this->file_size > $this->max_size) - { - return FALSE; - } - else - { - return TRUE; - } + return ($this->max_size === 0 OR $this->max_size > $this->file_size); } // -------------------------------------------------------------------- @@ -672,17 +679,15 @@ class CI_Upload { { $D = @getimagesize($this->file_temp); - if ($this->max_width > 0 AND $D['0'] > $this->max_width) + if ($this->max_width > 0 && $D[0] > $this->max_width) { return FALSE; } - if ($this->max_height > 0 AND $D['1'] > $this->max_height) + if ($this->max_height > 0 && $D[1] > $this->max_height) { return FALSE; } - - return TRUE; } return TRUE; @@ -695,20 +700,19 @@ class CI_Upload { * * Verifies that it is a valid upload path with proper permissions. * - * * @return bool */ public function validate_upload_path() { - if ($this->upload_path == '') + if ($this->upload_path === '') { $this->set_error('upload_no_filepath'); return FALSE; } - if (function_exists('realpath') AND @realpath($this->upload_path) !== FALSE) + if (@realpath($this->upload_path) !== FALSE) { - $this->upload_path = str_replace("\\", "/", realpath($this->upload_path)); + $this->upload_path = str_replace('\\', '/', realpath($this->upload_path)); } if ( ! @is_dir($this->upload_path)) @@ -723,7 +727,7 @@ class CI_Upload { return FALSE; } - $this->upload_path = preg_replace("/(.+?)\/*$/", "\\1/", $this->upload_path); + $this->upload_path = preg_replace('/(.+?)\/*$/', '\\1/', $this->upload_path); return TRUE; } @@ -738,7 +742,7 @@ class CI_Upload { public function get_extension($filename) { $x = explode('.', $filename); - return '.'.end($x); + return (count($x) !== 1) ? '.'.end($x) : ''; } // -------------------------------------------------------------------- @@ -752,37 +756,33 @@ class CI_Upload { public function clean_file_name($filename) { $bad = array( - "<!--", - "-->", - "'", - "<", - ">", - '"', - '&', - '$', - '=', - ';', - '?', - '/', - "%20", - "%22", - "%3c", // < - "%253c", // < - "%3e", // > - "%0e", // > - "%28", // ( - "%29", // ) - "%2528", // ( - "%26", // & - "%24", // $ - "%3f", // ? - "%3b", // ; - "%3d" // = - ); - - $filename = str_replace($bad, '', $filename); - - return stripslashes($filename); + '<!--', '-->', + "'", '"', + '<', '>', + '&', '$', + '=', + ';', + '?', + '/', + '!', + '#', + '%20', + '%22', + '%3c', // < + '%253c', // < + '%3e', // > + '%0e', // > + '%28', // ( + '%29', // ) + '%2528', // ( + '%26', // & + '%24', // $ + '%3f', // ? + '%3b', // ; + '%3d' // = + ); + + return stripslashes(str_replace($bad, '', $filename)); } // -------------------------------------------------------------------- @@ -831,23 +831,23 @@ class CI_Upload { return FALSE; } - if (function_exists('memory_get_usage') && memory_get_usage() && ini_get('memory_limit') != '') + if (memory_get_usage() && ($memory_limit = ini_get('memory_limit'))) { - $current = ini_get('memory_limit') * 1024 * 1024; + $memory_limit *= 1024 * 1024; // There was a bug/behavioural change in PHP 5.2, where numbers over one million get output - // into scientific notation. number_format() ensures this number is an integer + // into scientific notation. number_format() ensures this number is an integer // http://bugs.php.net/bug.php?id=43053 - $new_memory = number_format(ceil(filesize($file) + $current), 0, '.', ''); + $memory_limit = number_format(ceil(filesize($file) + $memory_limit), 0, '.', ''); - ini_set('memory_limit', $new_memory); // When an integer is used, the value is measured in bytes. - PHP.net + ini_set('memory_limit', $memory_limit); // When an integer is used, the value is measured in bytes. - PHP.net } // If the file being uploaded is an image, then we should have no problem with XSS attacks (in theory), but // IE can be fooled into mime-type detecting a malformed image as an html file, thus executing an XSS attack on anyone - // using IE who looks at the image. It does this by inspecting the first 255 bytes of an image. To get around this - // CI will itself look at the first 255 bytes of an image to determine its relative safety. This can save a lot of + // using IE who looks at the image. It does this by inspecting the first 255 bytes of an image. To get around this + // CI will itself look at the first 255 bytes of an image to determine its relative safety. This can save a lot of // processor power and time if it is actually a clean image, as it will be in nearly all instances _except_ an // attempted XSS attack. @@ -865,10 +865,8 @@ class CI_Upload { // <a, <body, <head, <html, <img, <plaintext, <pre, <script, <table, <title // title is basically just in SVG, but we filter it anyhow - if ( ! preg_match('/<(a|body|head|html|img|plaintext|pre|script|table|title)[\s>]/i', $opening_bytes)) - { - return TRUE; // its an image, no "triggers" detected in the first 256 bytes, we're good - } + // if its an image or no "triggers" detected in the first 256 bytes - we're good + return ! preg_match('/<(a|body|head|html|img|plaintext|pre|script|table|title)[\s>]/i', $opening_bytes); } if (($data = @file_get_contents($file)) === FALSE) @@ -897,14 +895,14 @@ class CI_Upload { { foreach ($msg as $val) { - $msg = ($CI->lang->line($val) == FALSE) ? $val : $CI->lang->line($val); + $msg = ($CI->lang->line($val) === FALSE) ? $val : $CI->lang->line($val); $this->error_msg[] = $msg; log_message('error', $msg); } } else { - $msg = ($CI->lang->line($msg) == FALSE) ? $msg : $CI->lang->line($msg); + $msg = ($CI->lang->line($msg) === FALSE) ? $msg : $CI->lang->line($msg); $this->error_msg[] = $msg; log_message('error', $msg); } @@ -921,13 +919,7 @@ class CI_Upload { */ public function display_errors($open = '<p>', $close = '</p>') { - $str = ''; - foreach ($this->error_msg as $val) - { - $str .= $open.$val.$close; - } - - return $str; + return (count($this->error_msg) > 0) ? $open.implode($close.$open, $this->error_msg).$close : ''; } // -------------------------------------------------------------------- @@ -935,7 +927,7 @@ class CI_Upload { /** * List of Mime Types * - * This is a list of mime types. We use it to validate + * This is a list of mime types. We use it to validate * the "allowed types" set by the developer * * @param string @@ -943,28 +935,7 @@ class CI_Upload { */ public function mimes_types($mime) { - global $mimes; - - if (count($this->mimes) == 0) - { - if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes.php')) - { - include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'); - } - elseif (is_file(APPPATH.'config/mimes.php')) - { - include(APPPATH.'config//mimes.php'); - } - else - { - return FALSE; - } - - $this->mimes = $mimes; - unset($mimes); - } - - return ( ! isset($this->mimes[$mime])) ? FALSE : $this->mimes[$mime]; + return isset($this->mimes[$mime]) ? $this->mimes[$mime] : FALSE; } // -------------------------------------------------------------------- @@ -980,7 +951,7 @@ class CI_Upload { */ protected function _prep_filename($filename) { - if (strpos($filename, '.') === FALSE OR $this->allowed_types == '*') + if (strpos($filename, '.') === FALSE OR $this->allowed_types === '*') { return $filename; } @@ -1001,15 +972,130 @@ class CI_Upload { } } - $filename .= '.'.$ext; - - return $filename; + return $filename.'.'.$ext; } // -------------------------------------------------------------------- + /** + * File MIME type + * + * Detects the (actual) MIME type of the uploaded file, if possible. + * The input array is expected to be $_FILES[$field] + * + * @param array + * @return void + */ + protected function _file_mime_type($file) + { + // We'll need this to validate the MIME info string (e.g. text/plain; charset=us-ascii) + $regexp = '/^([a-z\-]+\/[a-z0-9\-\.\+]+)(;\s.+)?$/'; + + /* Fileinfo extension - most reliable method + * + * Unfortunately, prior to PHP 5.3 - it's only available as a PECL extension and the + * more convenient FILEINFO_MIME_TYPE flag doesn't exist. + */ + if (function_exists('finfo_file')) + { + $finfo = @finfo_open(FILEINFO_MIME); + if (is_resource($finfo)) // It is possible that a FALSE value is returned, if there is no magic MIME database file found on the system + { + $mime = @finfo_file($finfo, $file['tmp_name']); + finfo_close($finfo); + + /* According to the comments section of the PHP manual page, + * it is possible that this function returns an empty string + * for some files (e.g. if they don't exist in the magic MIME database) + */ + if (is_string($mime) && preg_match($regexp, $mime, $matches)) + { + $this->file_type = $matches[1]; + return; + } + } + } + + /* This is an ugly hack, but UNIX-type systems provide a "native" way to detect the file type, + * which is still more secure than depending on the value of $_FILES[$field]['type'], and as it + * was reported in issue #750 (https://github.com/EllisLab/CodeIgniter/issues/750) - it's better + * than mime_content_type() as well, hence the attempts to try calling the command line with + * three different functions. + * + * Notes: + * - the DIRECTORY_SEPARATOR comparison ensures that we're not on a Windows system + * - many system admins would disable the exec(), shell_exec(), popen() and similar functions + * due to security concerns, hence the function_exists() checks + */ + if (DIRECTORY_SEPARATOR !== '\\') + { + $cmd = function_exists('escapeshellarg') + ? 'file --brief --mime '.escapeshellarg($file['tmp_name']).' 2>&1' + : 'file --brief --mime '.$file['tmp_name'].' 2>&1'; + + if (function_exists('exec')) + { + /* This might look confusing, as $mime is being populated with all of the output when set in the second parameter. + * However, we only neeed the last line, which is the actual return value of exec(), and as such - it overwrites + * anything that could already be set for $mime previously. This effectively makes the second parameter a dummy + * value, which is only put to allow us to get the return status code. + */ + $mime = @exec($cmd, $mime, $return_status); + if ($return_status === 0 && is_string($mime) && preg_match($regexp, $mime, $matches)) + { + $this->file_type = $matches[1]; + return; + } + } + + if ( (bool) @ini_get('safe_mode') === FALSE && function_exists('shell_exec')) + { + $mime = @shell_exec($cmd); + if (strlen($mime) > 0) + { + $mime = explode("\n", trim($mime)); + if (preg_match($regexp, $mime[(count($mime) - 1)], $matches)) + { + $this->file_type = $matches[1]; + return; + } + } + } + + if (function_exists('popen')) + { + $proc = @popen($cmd, 'r'); + if (is_resource($proc)) + { + $mime = @fread($proc, 512); + @pclose($proc); + if ($mime !== FALSE) + { + $mime = explode("\n", trim($mime)); + if (preg_match($regexp, $mime[(count($mime) - 1)], $matches)) + { + $this->file_type = $matches[1]; + return; + } + } + } + } + } + + // Fall back to the deprecated mime_content_type(), if available (still better than $_FILES[$field]['type']) + if (function_exists('mime_content_type')) + { + $this->file_type = @mime_content_type($file['tmp_name']); + if (strlen($this->file_type) > 0) // It's possible that mime_content_type() returns FALSE or an empty string + { + return; + } + } + + $this->file_type = $file['type']; + } + } -// END Upload Class /* End of file Upload.php */ /* Location: ./system/libraries/Upload.php */
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