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<?php |
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/* |
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Plugin Name: Really Simple CAPTCHA |
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Plugin URI: http://contactform7.com/captcha/ |
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Description: Really Simple CAPTCHA is a CAPTCHA module intended to be called from other plugins. It is originally created for my Contact Form 7 plugin. |
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Author: Takayuki Miyoshi |
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Author URI: http://ideasilo.wordpress.com/ |
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Text Domain: really-simple-captcha |
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Version: 1.9 |
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*/ |
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|
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; // Exit if accessed directly. |
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} |
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|
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/* Copyright 2007-2016 Takayuki Miyoshi (email: takayukister at gmail.com) |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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define( 'WPDEVREALLYSIMPLECAPTCHA_VERSION', '1.9.0.1' ); |
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|
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class wpdevReallySimpleCaptcha { |
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|
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public $chars; |
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public $char_length; |
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public $fonts; |
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public $tmp_dir; |
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public $img_size; |
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public $bg; |
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public $fg; |
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public $base; |
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public $font_size; |
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public $font_char_width; |
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public $img_type; |
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public $file_mode; |
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public $answer_file_mode; |
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|
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public function __construct() { |
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|
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/* Characters available in images */ |
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$this->chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789'; |
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|
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/* Length of a word in an image */ |
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$this->char_length = 4; |
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|
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/* Array of fonts. Randomly picked up per character */ |
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$this->fonts = array( |
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dirname( __FILE__ ) . '/gentium/GenBkBasR.ttf', |
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dirname( __FILE__ ) . '/gentium/GenBkBasI.ttf', |
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dirname( __FILE__ ) . '/gentium/GenBkBasBI.ttf', |
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dirname( __FILE__ ) . '/gentium/GenBkBasB.ttf' ); |
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|
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/* Directory temporary keeping CAPTCHA images and corresponding text files */ |
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$this->tmp_dir = path_join( dirname( __FILE__ ), 'tmp' ); |
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|
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/* Array of CAPTCHA image size. Width and height */ |
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$this->img_size = array( 72, 24 ); |
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|
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/* Background color of CAPTCHA image. RGB color 0-255 */ |
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$this->bg = array( 255, 255, 255 ); |
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|
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/* Foreground (character) color of CAPTCHA image. RGB color 0-255 */ |
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$this->fg = array( 0, 0, 0 ); |
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|
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// FixIn: 10.0.0.54. |
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if ( ( function_exists( 'get_bk_option' ) ) && ( 'wpbc_theme_dark_1' === get_bk_option( 'booking_form_theme' ) ) ) { |
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$this->bg = array( 39, 39, 39 ); |
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$this->fg = array( 255, 255, 255 ); |
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} |
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|
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/* Coordinates for a text in an image. I don't know the meaning. Just adjust. */ |
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$this->base = array( 6, 18 ); |
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|
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/* Font size */ |
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$this->font_size = 14; |
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|
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/* Width of a character */ |
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$this->font_char_width = 15; |
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|
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/* Image type. 'png', 'gif' or 'jpeg' */ |
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$this->img_type = 'png'; |
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|
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/* Mode of temporary image files */ |
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$this->file_mode = 0644; |
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|
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/* Mode of temporary answer text files */ |
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$this->answer_file_mode = 0640; |
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} |
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|
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/** |
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* Generate and return a random word. |
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* |
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* @return string Random word with $chars characters x $char_length length |
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*/ |
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public function generate_random_word() { |
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$word = ''; |
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|
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for ( $i = 0; $i < $this->char_length; $i++ ) { |
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$pos = wp_rand( 0, strlen( $this->chars ) - 1 ); |
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$char = $this->chars[$pos]; |
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$word .= $char; |
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} |
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|
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return $word; |
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} |
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|
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/** |
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* Generate CAPTCHA image and corresponding answer file. |
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* |
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* @param string $prefix File prefix used for both files |
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* @param string $word Random word generated by generate_random_word() |
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* @return string|bool The file name of the CAPTCHA image. Return false if temp directory is not available. |
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*/ |
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public function generate_image( $prefix, $word ) { |
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if ( ! $this->make_tmp_dir() ) { |
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return false; |
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} |
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|
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$this->cleanup(); |
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|
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$dir = trailingslashit( $this->tmp_dir ); |
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$filename = null; |
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|
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if ( $im = imagecreatetruecolor( $this->img_size[0], $this->img_size[1] ) ) { |
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|
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$bg = imagecolorallocate( $im, $this->bg[0], $this->bg[1], $this->bg[2] ); |
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$fg = imagecolorallocate( $im, $this->fg[0], $this->fg[1], $this->fg[2] ); |
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|
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imagefill( $im, 0, 0, $bg ); |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.rand_mt_rand |
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$x = $this->base[0] + mt_rand( -2, 2 ); |
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|
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for ( $i = 0; $i < strlen( $word ); $i++ ) { |
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$font = $this->fonts[array_rand( $this->fonts )]; |
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$font = $this->normalize_path( $font ); |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.rand_mt_rand |
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imagettftext( $im, $this->font_size, mt_rand( -12, 12 ), $x, $this->base[1] + mt_rand( -2, 2 ), $fg, $font, $word[$i] ); |
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$x += $this->font_char_width; |
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} |
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|
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switch ( $this->img_type ) { |
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case 'jpeg': |
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$filename = sanitize_file_name( $prefix . '.jpeg' ); |
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$file = $this->normalize_path( $dir . $filename ); |
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imagejpeg( $im, $file ); |
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break; |
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case 'gif': |
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$filename = sanitize_file_name( $prefix . '.gif' ); |
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$file = $this->normalize_path( $dir . $filename ); |
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imagegif( $im, $file ); |
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break; |
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case 'png': |
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default: |
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$filename = sanitize_file_name( $prefix . '.png' ); |
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$file = $this->normalize_path( $dir . $filename ); |
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imagepng( $im, $file ); |
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} |
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|
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imagedestroy( $im ); |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_chmod |
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@chmod( $file, $this->file_mode ); |
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} |
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|
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$this->generate_answer_file( $prefix, $word ); |
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|
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return $filename; |
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} |
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|
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/** |
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* Generate answer file corresponding to CAPTCHA image. |
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* |
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* @param string $prefix File prefix used for answer file |
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* @param string $word Random word generated by generate_random_word() |
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*/ |
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public function generate_answer_file( $prefix, $word ) { |
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$dir = trailingslashit( $this->tmp_dir ); |
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$answer_file = $dir . sanitize_file_name( $prefix . '.txt' ); |
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$answer_file = $this->normalize_path( $answer_file ); |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fopen |
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if ( $fh = @fopen( $answer_file, 'w' ) ) { |
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$word = strtoupper( $word ); |
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$salt = wp_generate_password( 64 ); |
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$hash = hash_hmac( 'md5', $word, $salt ); |
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|
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$code = $salt . '|' . $hash; |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
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fwrite( $fh, $code ); |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fclose |
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fclose( $fh ); |
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} |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_chmod |
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@chmod( $answer_file, $this->answer_file_mode ); |
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} |
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|
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/** |
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* Check a response against the code kept in the temporary file. |
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* |
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* @param string $prefix File prefix used for both files |
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* @param string $response CAPTCHA response |
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* @return bool Return true if the two match, otherwise return false. |
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*/ |
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public function check( $prefix, $response ) { |
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if ( 0 == strlen( $prefix ) ) { |
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return false; |
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} |
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|
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$response = str_replace( array( " ", "\t" ), '', $response ); |
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$response = strtoupper( $response ); |
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|
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$dir = trailingslashit( $this->tmp_dir ); |
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$filename = sanitize_file_name( $prefix . '.txt' ); |
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$file = $this->normalize_path( $dir . $filename ); |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents |
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if ( @is_readable( $file ) && ( $code = file_get_contents( $file ) ) ) { |
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$code = explode( '|', $code, 2 ); |
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|
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$salt = $code[0]; |
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$hash = $code[1]; |
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|
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if ( hash_hmac( 'md5', $response, $salt ) == $hash ) { |
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return true; |
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} |
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} |
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|
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return false; |
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} |
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|
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/** |
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* Remove temporary files with given prefix. |
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* |
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* @param string $prefix File prefix |
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*/ |
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public function remove( $prefix ) { |
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$dir = trailingslashit( $this->tmp_dir ); |
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$suffixes = array( '.jpeg', '.gif', '.png', '.php', '.txt' ); |
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|
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foreach ( $suffixes as $suffix ) { |
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$filename = sanitize_file_name( $prefix . $suffix ); |
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$file = $this->normalize_path( $dir . $filename ); |
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|
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if ( @is_file( $file ) ) { |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.unlink_unlink |
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@wp_delete_file( $file ); |
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} |
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} |
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} |
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|
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/** |
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* Clean up dead files older than given length of time. |
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* |
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* @param int $minutes Consider older files than this time as dead files |
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* @return int|bool The number of removed files. Return false if error occurred. |
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*/ |
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public function cleanup( $minutes = 60, $max = 100 ) { |
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$dir = trailingslashit( $this->tmp_dir ); |
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$dir = $this->normalize_path( $dir ); |
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|
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if ( ! @is_dir( $dir ) || ! @is_readable( $dir ) ) { |
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return false; |
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} |
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|
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$is_win = ( 'WIN' === strtoupper( substr( PHP_OS, 0, 3 ) ) ); |
| 276 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_is_writable |
| 277 |
if ( ! ( $is_win ? win_is_writable( $dir ) : @is_writable( $dir ) ) ) { |
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return false; |
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} |
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|
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$count = 0; |
| 282 |
|
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if ( $handle = @opendir( $dir ) ) { |
| 284 |
while ( false !== ( $filename = readdir( $handle ) ) ) { |
| 285 |
if ( ! preg_match( '/^[0-9]+\.(php|txt|png|gif|jpeg)$/', $filename ) ) { |
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continue; |
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} |
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|
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$file = $this->normalize_path( $dir . $filename ); |
| 290 |
|
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$stat = @stat( $file ); |
| 292 |
if ( false === $stat || ! isset( $stat['mtime'] ) ) { |
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// A concurrent CAPTCHA cleanup can remove the file after readdir(). |
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continue; |
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} |
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|
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if ( ( $stat['mtime'] + $minutes * 60 ) < time() ) { |
| 298 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.unlink_unlink |
| 299 |
if ( ! @wp_delete_file( $file ) ) { |
| 300 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_chmod |
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@chmod( $file, 0644 ); |
| 302 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.unlink_unlink |
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@wp_delete_file( $file ); |
| 304 |
} |
| 305 |
|
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$count += 1; |
| 307 |
} |
| 308 |
|
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if ( $max <= $count ) { |
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break; |
| 311 |
} |
| 312 |
} |
| 313 |
|
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closedir( $handle ); |
| 315 |
} |
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|
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return $count; |
| 318 |
} |
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|
| 320 |
/** |
| 321 |
* Make a temporary directory and generate .htaccess file in it. |
| 322 |
* |
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* @return bool True on successful create, false on failure. |
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*/ |
| 325 |
public function make_tmp_dir() { |
| 326 |
$dir = trailingslashit( $this->tmp_dir ); |
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$dir = $this->normalize_path( $dir ); |
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|
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if ( ! wp_mkdir_p( $dir ) ) { |
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return false; |
| 331 |
} |
| 332 |
|
| 333 |
$htaccess_file = $this->normalize_path( $dir . '.htaccess' ); |
| 334 |
|
| 335 |
if ( file_exists( $htaccess_file ) ) { |
| 336 |
return true; |
| 337 |
} |
| 338 |
|
| 339 |
// FixIn: 8.7.7.5 |
| 340 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fopen |
| 341 |
if ( $handle = @fopen( $htaccess_file, 'w' ) ) { |
| 342 |
|
| 343 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 344 |
fwrite( $handle, '# apache 2.2' . "\n" ); |
| 345 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 346 |
fwrite( $handle, '<IfModule !mod_authz_core.c>' . "\n" ); |
| 347 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 348 |
fwrite( $handle, ' Order deny,allow' . "\n" ); |
| 349 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 350 |
fwrite( $handle, ' Deny from all' . "\n" ); |
| 351 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 352 |
fwrite( $handle, ' <Files ~ "^[0-9A-Za-z]+\.(jpeg|gif|png)$">' . "\n" ); |
| 353 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 354 |
fwrite( $handle, ' Allow from all' . "\n" ); |
| 355 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 356 |
fwrite( $handle, ' </Files>' . "\n" ); |
| 357 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 358 |
fwrite( $handle, '</IfModule>' . "\n" ); |
| 359 |
|
| 360 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 361 |
fwrite( $handle, '# apache 2.4' . "\n" ); |
| 362 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 363 |
fwrite( $handle, '<IfModule mod_authz_core.c>' . "\n" ); |
| 364 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 365 |
fwrite( $handle, ' Require all denied' . "\n" ); |
| 366 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 367 |
fwrite( $handle, ' <Files ~ "^[0-9A-Za-z]+\.(jpeg|gif|png)$">' . "\n" ); |
| 368 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 369 |
fwrite( $handle, ' Require all granted' . "\n" ); |
| 370 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 371 |
fwrite( $handle, ' </Files>' . "\n" ); |
| 372 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fwrite |
| 373 |
fwrite( $handle, '</IfModule>' . "\n" ); |
| 374 |
|
| 375 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_fclose |
| 376 |
fclose( $handle ); |
| 377 |
} |
| 378 |
|
| 379 |
/* |
| 380 |
// Check Apache version |
| 381 |
$apache_ver = '0'; |
| 382 |
if ( ( isset( $_SERVER['SERVER_SOFTWARE'] ) ) && ( false !== strpos( $_SERVER['SERVER_SOFTWARE'], 'Apache/2.4' ) ) ) { |
| 383 |
|
| 384 |
$apache_ver = explode( "Apache", $_SERVER['SERVER_SOFTWARE'] ); // Apache/1.3.29 (Unix) PHP |
| 385 |
if ( isset( $apache_ver[1] ) ) { |
| 386 |
$apache_ver = trim( $apache_ver[1], '/ ' ); |
| 387 |
$apache_ver = explode( " ", $apache_ver ); |
| 388 |
$apache_ver = trim( $apache_ver[0] ); |
| 389 |
} else { |
| 390 |
$apache_ver = '0'; |
| 391 |
} |
| 392 |
} |
| 393 |
if ( version_compare( $apache_ver, '2.4', '>=' ) ) { |
| 394 |
// Apache 2.4 or newer |
| 395 |
|
| 396 |
if ( $handle = @fopen( $htaccess_file, 'w' ) ) { |
| 397 |
fwrite( $handle, 'Require all denied' . "\n" ); |
| 398 |
fwrite( $handle, '<Files ~ "^[0-9A-Za-z]+\\.(jpeg|gif|png)$">' . "\n" ); |
| 399 |
fwrite( $handle, ' Require all granted' . "\n" ); |
| 400 |
fwrite( $handle, '</Files>' . "\n" ); |
| 401 |
fclose( $handle ); |
| 402 |
} |
| 403 |
} else { |
| 404 |
|
| 405 |
// Apache 2.2 or lower |
| 406 |
if ( $handle = @fopen( $htaccess_file, 'w' ) ) { |
| 407 |
fwrite( $handle, 'Order deny,allow' . "\n" ); |
| 408 |
fwrite( $handle, 'Deny from all' . "\n" ); |
| 409 |
fwrite( $handle, '<Files ~ "^[0-9A-Za-z]+\\.(jpeg|gif|png)$">' . "\n" ); |
| 410 |
fwrite( $handle, ' Allow from all' . "\n" ); |
| 411 |
fwrite( $handle, '</Files>' . "\n" ); |
| 412 |
fclose( $handle ); |
| 413 |
} |
| 414 |
} |
| 415 |
*/ |
| 416 |
return true; |
| 417 |
} |
| 418 |
|
| 419 |
/** |
| 420 |
* Normalize a filesystem path. |
| 421 |
* |
| 422 |
* This should be replaced by wp_normalize_path when the plugin's |
| 423 |
* minimum requirement becomes WordPress 3.9 or higher. |
| 424 |
* |
| 425 |
* @param string $path Path to normalize. |
| 426 |
* @return string Normalized path. |
| 427 |
*/ |
| 428 |
private function normalize_path( $path ) { |
| 429 |
$path = str_replace( '\\', '/', $path ); |
| 430 |
$path = preg_replace( '|/+|', '/', $path ); |
| 431 |
return $path; |
| 432 |
} |
| 433 |
} |
| 434 |
|
