1442 lines
48 KiB
PHP
1442 lines
48 KiB
PHP
<?php
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namespace BRSystems\Core\Library\cSecureImage;
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// error_reporting(E_ALL); ini_set('display_errors', 1); // uncomment this line for debugging
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use Exception;
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use InvalidArgumentException;
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/**
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* Project: Securimage: A PHP class for creating and managing form CAPTCHA images<br />
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* File: securimage.php<br />
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*
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* Copyright (c) 2011, Drew Phillips
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* Any modifications to the library should be indicated clearly in the source code
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* to inform users that the changes are not a part of the original software.<br /><br />
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*
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* If you found this script useful, please take a quick moment to rate it.<br />
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* http://www.hotscripts.com/rate/49400.html Thanks.
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*
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* @link http://www.phpcaptcha.org Securimage PHP CAPTCHA
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* @link http://www.phpcaptcha.org/latest.zip Download Latest Version
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* @link http://www.phpcaptcha.org/Securimage_Docs/ Online Documentation
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* @copyright 2011 Drew Phillips
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* @author Drew Phillips <drew@drew-phillips.com>
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* @version 3.0.1 (January 2012)
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* @package Securimage
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*
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*/
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/**
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ChangeLog
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3.1
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- Bugfix: removed use of deprecated variable in addSignature method that would cause errors with display_errors on
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3.0
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- Rewrite class using PHP5 OOP
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- Remove support for GD fonts, require FreeType
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- Remove support for multi-color codes
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- Add option to make codes case-sensitive
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- Add namespaces to support multiple captchas on a single page or page specific captchas
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- Add option to show simple math problems instead of codes
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- Remove support for mp3 files due to vulnerability in decoding mp3 audio files
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- Create new flash file to stream wav files instead of mp3
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- Changed to BSD license
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2.0.2
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- Fix pathing to make integration into libraries easier (Nathan Phillip Brink ohnobinki@ohnopublishing.net)
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2.0.1
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- Add support for browsers with cookies disabled (requires php5, sqlite) maps users to md5 hashed ip addresses and md5 hashed codes for security
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- Add fallback to gd fonts if ttf support is not enabled or font file not found (Mike Challis http://www.642weather.com/weather/scripts.php)
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- Check for previous definition of image type constants (Mike Challis)
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- Fix mime type settings for audio output
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- Fixed color allocation issues with multiple colors and background images, consolidate allocation to one function
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- Ability to let codes expire after a given length of time
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- Allow HTML color codes to be passed to Securimage_Color (suggested by Mike Challis)
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2.0.0
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- Add mathematical distortion to characters (using code from HKCaptcha)
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- Improved session support
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- Added Securimage_Color class for easier color definitions
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- Add distortion to audio output to prevent binary comparison attack (proposed by Sven "SavageTiger" Hagemann [insecurity.nl])
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- Flash button to stream mp3 audio (Douglas Walsh www.douglaswalsh.net)
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- Audio output is mp3 format by default
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- Change font to AlteHaasGrotesk by yann le coroller
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- Some code cleanup
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1.0.4 (unreleased)
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- Ability to output audible codes in mp3 format to stream from flash
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1.0.3.1
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- Error reading from wordlist in some cases caused words to be cut off 1 letter short
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1.0.3
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- Removed shadow_text from code which could cause an undefined property error due to removal from previous version
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1.0.2
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- Audible CAPTCHA Code wav files
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- Create codes from a word list instead of random strings
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1.0
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- Added the ability to use a selected character set, rather than a-z0-9 only.
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- Added the multi-color text option to use different colors for each letter.
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- Switched to automatic session handling instead of using files for code storage
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- Added GD Font support if ttf support is not available. Can use internal GD fonts or load new ones.
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- Added the ability to set line thickness
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- Added option for drawing arced lines over letters
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- Added ability to choose image type for output
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*/
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/**
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* Securimage CAPTCHA Class.
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*
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* @version 3.0
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* @package Securimage
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* @subpackage classes
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* @author Drew Phillips <drew@drew-phillips.com>
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*
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*/
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class cSecureImage
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{
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// All of the public variables below are securimage options
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// They can be passed as an array to the Securimage constructor, set below,
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// or set from securimage_show.php and securimage_play.php
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/**
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* Renders captcha as a JPEG image
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* @var int
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*/
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const SI_IMAGE_JPEG = 1;
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/**
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* Renders captcha as a PNG image (default)
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* @var int
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*/
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const SI_IMAGE_PNG = 2;
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/**
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* Renders captcha as a GIF image
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* @var int
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*/
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const SI_IMAGE_GIF = 3;
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/**
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* Create a normal alphanumeric captcha
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* @var int
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*/
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const SI_CAPTCHA_STRING = 0;
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/**
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* Create a captcha consisting of a simple math problem
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* @var int
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*/
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const SI_CAPTCHA_MATHEMATIC = 1;
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/**
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* The width of the captcha image
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* @var int
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*/
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public $image_width = 215;
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/**
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* The height of the captcha image
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* @var int
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*/
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public $image_height = 80;
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/**
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* The type of the image, default = png
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* @var int
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*/
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public $image_type = self::SI_IMAGE_PNG;
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/**
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* The background color of the captcha
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* @var Securimage_Color
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*/
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public $image_bg_color = '#ffffff';
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/**
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* The color of the captcha text
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* @var Securimage_Color
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*/
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public $text_color = '#707070';
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/**
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* The color of the lines over the captcha
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* @var Securimage_Color
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*/
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public $line_color = '#707070';
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/**
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* The color of the noise that is drawn
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* @var Securimage_Color
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*/
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public $noise_color = '#707070';
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/**
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* How transparent to make the text 0 = completely opaque, 100 = invisible
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* @var int
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*/
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public $text_transparency_percentage = 50;
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/**
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* Whether or not to draw the text transparently, true = use transparency, false = no transparency
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* @var bool
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*/
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public $use_transparent_text = false;
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/**
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* The length of the captcha code
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* @var int
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*/
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public $code_length = 6;
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/**
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* Whether the captcha should be case sensitive (not recommended, use only for maximum protection)
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* @var bool
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*/
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public $case_sensitive = false;
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/**
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* The character set to use for generating the captcha code
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* @var string
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*/
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public $charset = 'ABCDEFGHKLMNPRSTUVWYZabcdefghklmnprstuvwyz23456789';
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/**
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* How long in seconds a captcha remains valid, after this time it will not be accepted
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* @var unknown_type
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*/
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public $expiry_time = 900;
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/**
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* The session name securimage should use, only set this if your application uses a custom session name
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* It is recommended to set this value below so it is used by all securimage scripts
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* @var string
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*/
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public $session_name = null;
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/**
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* true to use the wordlist file, false to generate random captcha codes
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* @var bool
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*/
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public $use_wordlist = false;
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/**
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* The level of distortion, 0.75 = normal, 1.0 = very high distortion
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* @var double
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*/
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public $perturbation = 0.75;
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/**
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* How many lines to draw over the captcha code to increase security
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* @var int
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*/
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public $num_lines = 8;
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/**
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* The level of noise (random dots) to place on the image, 0-10
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* @var int
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*/
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public $noise_level = 0;
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/**
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* The signature text to draw on the bottom corner of the image
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* @var string
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*/
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public $image_signature = '';
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/**
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* The color of the signature text
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* @var Securimage_Color
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*/
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public $signature_color = '#707070';
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/**
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* The path to the ttf font file to use for the signature text, defaults to $ttf_file (AHGBold.ttf)
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* @var string
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*/
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public $signature_font;
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/**
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* Use an SQLite database to store data (for users that do not support cookies)
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* @var bool
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*/
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public $use_sqlite_db = false;
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/**
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* The type of captcha to create, either alphanumeric, or a math problem<br />
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* Securimage::SI_CAPTCHA_STRING or Securimage::SI_CAPTCHA_MATHEMATIC
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* @var int
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*/
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public $captcha_type = self::SI_CAPTCHA_STRING;
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/**
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* The captcha namespace, use this if you have multiple forms on a single page, blank if you do not use multiple forms on one page
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* @var string
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* <code>
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* <?php
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* // in securimage_show.php (create one show script for each form)
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* $img->namespace = 'contact_form';
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*
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* // in form validator
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* $img->namespace = 'contact_form';
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* if ($img->check($code) == true) {
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* echo "Valid!";
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* }
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* </code>
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*/
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public $namespace;
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/**
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* The font file to use to draw the captcha code, leave blank for default font AHGBold.ttf
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* @var string
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*/
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public $ttf_file;
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/**
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* The path to the wordlist file to use, leave blank for default words/words.txt
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* @var string
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*/
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public $wordlist_file;
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/**
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* The directory to scan for background images, if set a random background will be chosen from this folder
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* @var string
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*/
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public $background_directory;
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/**
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* The path to the SQLite database file to use, if $use_sqlite_database = true, should be chmod 666
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* @var string
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*/
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public $sqlite_database;
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/**
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* The path to the securimage audio directory, can be set in securimage_play.php
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* @var string
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* <code>
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* $img->audio_path = '/home/yoursite/public_html/securimage/audio/';
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* </code>
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*/
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public $audio_path;
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protected $im;
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protected $tmpimg;
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protected $bgimg;
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protected $iscale = 5;
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protected $securimage_path = null;
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protected $code;
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protected $code_display;
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protected $captcha_code;
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protected $sqlite_handle;
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protected $gdbgcolor;
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protected $gdtextcolor;
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protected $gdlinecolor;
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protected $gdsignaturecolor;
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/**
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* Create a new securimage object, pass options to set in the constructor.<br />
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* This can be used to display a captcha, play an audible captcha, or validate an entry
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* @param array $options
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* <code>
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* $options = array(
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* 'text_color' => new Securimage_Color('#013020'),
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* 'code_length' => 5,
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* 'num_lines' => 5,
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* 'noise_level' => 3,
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* 'font_file' => Securimage::getPath() . '/custom.ttf'
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* );
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*
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* $img = new Securimage($options);
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* </code>
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*/
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public function __construct($options = array())
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{
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$this->securimage_path = dirname(__FILE__);
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if (is_array($options) && sizeof($options) > 0) {
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foreach($options as $prop => $val) {
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$this->$prop = $val;
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}
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}
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$this->image_bg_color = $this->initColor($this->image_bg_color, '#ffffff');
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$this->text_color = $this->initColor($this->text_color, '#616161');
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$this->line_color = $this->initColor($this->line_color, '#616161');
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$this->noise_color = $this->initColor($this->noise_color, '#616161');
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$this->signature_color = $this->initColor($this->signature_color, '#616161');
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if ($this->ttf_file == null) {
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$this->ttf_file = $this->securimage_path . '/AHGBold.ttf';
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}
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$this->signature_font = $this->ttf_file;
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if ($this->wordlist_file == null) {
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$this->wordlist_file = $this->securimage_path . '/words/words.txt';
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}
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if ($this->sqlite_database == null) {
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$this->sqlite_database = $this->securimage_path . '/database/securimage.sqlite';
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}
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if ($this->audio_path == null) {
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$this->audio_path = $this->securimage_path . '/audio/';
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}
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if ($this->code_length == null || $this->code_length < 1) {
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$this->code_length = 6;
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}
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if ($this->perturbation == null || !is_numeric($this->perturbation)) {
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$this->perturbation = 0.75;
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}
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if ($this->namespace == null || !is_string($this->namespace)) {
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$this->namespace = 'default';
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}
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// Initialize session or attach to existing
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if ( session_id() == '' ) { // no session has been started yet, which is needed for validation
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if ($this->session_name != null && trim($this->session_name) != '') {
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session_name(trim($this->session_name)); // set session name if provided
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}
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session_start();
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}
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}
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/**
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* Return the absolute path to the Securimage directory
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* @return string The path to the securimage base directory
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*/
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public static function getPath()
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{
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return dirname(__FILE__);
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}
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/**
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* Used to serve a captcha image to the browser
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* @param string $background_image The path to the background image to use
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* <code>
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* $img = new Securimage();
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* $img->code_length = 6;
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* $img->num_lines = 5;
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* $img->noise_level = 5;
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*
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* $img->show(); // sends the image to browser
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* exit;
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* </code>
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*/
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public function show($background_image = '')
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{
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if($background_image != '' && is_readable($background_image)) {
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$this->bgimg = $background_image;
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}
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$this->doImage();
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}
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/**
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* Check a submitted code against the stored value
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* @param string $code The captcha code to check
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* <code>
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* $code = $_POST['code'];
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* $img = new Securimage();
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* if ($img->check($code) == true) {
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* $captcha_valid = true;
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* } else {
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* $captcha_valid = false;
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* }
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* </code>
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*/
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public function check($code)
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{
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$this->code_entered = $code;
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$this->validate();
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return $this->correct_code;
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}
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/**
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* Output a wav file of the captcha code to the browser
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*
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* <code>
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* $img = new Securimage();
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* $img->outputAudioFile(); // outputs a wav file to the browser
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* exit;
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* </code>
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*/
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public function outputAudioFile()
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{
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$ext = 'wav'; // force wav - mp3 is insecure
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header("Content-Disposition: attachment; filename=\"securimage_audio.{$ext}\"");
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header('Cache-Control: no-store, no-cache, must-revalidate');
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header('Expires: Sun, 1 Jan 2000 12:00:00 GMT');
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header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . 'GMT');
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header('Content-type: audio/x-wav');
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$audio = $this->getAudibleCode($ext);
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header('Content-Length: ' . strlen($audio));
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echo $audio;
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exit;
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}
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/**
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* The main image drawing routing, responsible for constructing the entire image and serving it
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*/
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protected function doImage()
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{
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if( ($this->use_transparent_text == true || $this->bgimg != '') && function_exists('imagecreatetruecolor')) {
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$imagecreate = 'imagecreatetruecolor';
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} else {
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$imagecreate = 'imagecreate';
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}
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$this->im = $imagecreate($this->image_width, $this->image_height);
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$this->tmpimg = $imagecreate($this->image_width * $this->iscale, $this->image_height * $this->iscale);
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$this->allocateColors();
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imagepalettecopy($this->tmpimg, $this->im);
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$this->setBackground();
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$this->createCode();
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if ($this->noise_level > 0) {
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$this->drawNoise();
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}
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$this->drawWord();
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if ($this->perturbation > 0 && is_readable($this->ttf_file)) {
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$this->distortedCopy();
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}
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if ($this->num_lines > 0) {
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$this->drawLines();
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}
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if (trim($this->image_signature) != '') {
|
|
$this->addSignature();
|
|
}
|
|
|
|
$this->output();
|
|
}
|
|
|
|
/**
|
|
* Allocate the colors to be used for the image
|
|
*/
|
|
protected function allocateColors()
|
|
{
|
|
// allocate bg color first for imagecreate
|
|
$this->gdbgcolor = imagecolorallocate($this->im,
|
|
$this->image_bg_color->r,
|
|
$this->image_bg_color->g,
|
|
$this->image_bg_color->b);
|
|
|
|
$alpha = intval($this->text_transparency_percentage / 100 * 127);
|
|
|
|
if ($this->use_transparent_text == true) {
|
|
$this->gdtextcolor = imagecolorallocatealpha($this->im,
|
|
$this->text_color->r,
|
|
$this->text_color->g,
|
|
$this->text_color->b,
|
|
$alpha);
|
|
$this->gdlinecolor = imagecolorallocatealpha($this->im,
|
|
$this->line_color->r,
|
|
$this->line_color->g,
|
|
$this->line_color->b,
|
|
$alpha);
|
|
$this->gdnoisecolor = imagecolorallocatealpha($this->im,
|
|
$this->noise_color->r,
|
|
$this->noise_color->g,
|
|
$this->noise_color->b,
|
|
$alpha);
|
|
} else {
|
|
$this->gdtextcolor = imagecolorallocate($this->im,
|
|
$this->text_color->r,
|
|
$this->text_color->g,
|
|
$this->text_color->b);
|
|
$this->gdlinecolor = imagecolorallocate($this->im,
|
|
$this->line_color->r,
|
|
$this->line_color->g,
|
|
$this->line_color->b);
|
|
$this->gdnoisecolor = imagecolorallocate($this->im,
|
|
$this->noise_color->r,
|
|
$this->noise_color->g,
|
|
$this->noise_color->b);
|
|
}
|
|
|
|
$this->gdsignaturecolor = imagecolorallocate($this->im,
|
|
$this->signature_color->r,
|
|
$this->signature_color->g,
|
|
$this->signature_color->b);
|
|
|
|
}
|
|
|
|
/**
|
|
* The the background color, or background image to be used
|
|
*/
|
|
protected function setBackground()
|
|
{
|
|
// set background color of image by drawing a rectangle since imagecreatetruecolor doesn't set a bg color
|
|
imagefilledrectangle($this->im, 0, 0,
|
|
$this->image_width, $this->image_height,
|
|
$this->gdbgcolor);
|
|
imagefilledrectangle($this->tmpimg, 0, 0,
|
|
$this->image_width * $this->iscale, $this->image_height * $this->iscale,
|
|
$this->gdbgcolor);
|
|
|
|
if ($this->bgimg == '') {
|
|
if ($this->background_directory != null &&
|
|
is_dir($this->background_directory) &&
|
|
is_readable($this->background_directory))
|
|
{
|
|
$img = $this->getBackgroundFromDirectory();
|
|
if ($img != false) {
|
|
$this->bgimg = $img;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($this->bgimg == '') {
|
|
return;
|
|
}
|
|
|
|
$dat = @getimagesize($this->bgimg);
|
|
if($dat == false) {
|
|
return;
|
|
}
|
|
|
|
switch($dat[2]) {
|
|
case 1: $newim = @imagecreatefromgif($this->bgimg); break;
|
|
case 2: $newim = @imagecreatefromjpeg($this->bgimg); break;
|
|
case 3: $newim = @imagecreatefrompng($this->bgimg); break;
|
|
default: return;
|
|
}
|
|
|
|
if(!$newim) return;
|
|
|
|
imagecopyresized($this->im, $newim, 0, 0, 0, 0,
|
|
$this->image_width, $this->image_height,
|
|
imagesx($newim), imagesy($newim));
|
|
}
|
|
|
|
/**
|
|
* Scan the directory for a background image to use
|
|
*/
|
|
protected function getBackgroundFromDirectory()
|
|
{
|
|
$images = array();
|
|
|
|
if ( ($dh = opendir($this->background_directory)) !== false) {
|
|
while (($file = readdir($dh)) !== false) {
|
|
if (preg_match('/(jpg|gif|png)$/i', $file)) $images[] = $file;
|
|
}
|
|
|
|
closedir($dh);
|
|
|
|
if (sizeof($images) > 0) {
|
|
return rtrim($this->background_directory, '/') . '/' . $images[rand(0, sizeof($images)-1)];
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Generates the code or math problem and saves the value to the session
|
|
*/
|
|
protected function createCode()
|
|
{
|
|
$this->code = false;
|
|
|
|
switch($this->captcha_type) {
|
|
case self::SI_CAPTCHA_MATHEMATIC:
|
|
{
|
|
$signs = array('+', '-', 'x');
|
|
$left = rand(1, 10);
|
|
$right = rand(1, 5);
|
|
$sign = $signs[rand(0, 2)];
|
|
|
|
switch($sign) {
|
|
case 'x': $c = $left * $right; break;
|
|
case '-': $c = $left - $right; break;
|
|
default: $c = $left + $right; break;
|
|
}
|
|
|
|
$this->code = $c;
|
|
$this->code_display = "$left $sign $right";
|
|
break;
|
|
}
|
|
|
|
default:
|
|
{
|
|
if ($this->use_wordlist && is_readable($this->wordlist_file)) {
|
|
$this->code = $this->readCodeFromFile();
|
|
}
|
|
|
|
if ($this->code == false) {
|
|
$this->code = $this->generateCode($this->code_length);
|
|
}
|
|
|
|
$this->code_display = $this->code;
|
|
$this->code = ($this->case_sensitive) ? $this->code : strtolower($this->code);
|
|
} // default
|
|
}
|
|
|
|
$this->saveData();
|
|
}
|
|
|
|
/**
|
|
* Draws the captcha code on the image
|
|
*/
|
|
protected function drawWord()
|
|
{
|
|
$width2 = $this->image_width * $this->iscale;
|
|
$height2 = $this->image_height * $this->iscale;
|
|
|
|
if (!is_readable($this->ttf_file)) {
|
|
imagestring($this->im, 4, 10, ($this->image_height / 2) - 5, 'Failed to load TTF font file!', $this->gdtextcolor);
|
|
} else {
|
|
if ($this->perturbation > 0) {
|
|
$font_size = $height2 * .4;
|
|
$bb = imageftbbox($font_size, 0, $this->ttf_file, $this->code_display);
|
|
$tx = $bb[4] - $bb[0];
|
|
$ty = $bb[5] - $bb[1];
|
|
$x = floor($width2 / 2 - $tx / 2 - $bb[0]);
|
|
$y = round($height2 / 2 - $ty / 2 - $bb[1]);
|
|
|
|
imagettftext($this->tmpimg, $font_size, 0, $x, $y, $this->gdtextcolor, $this->ttf_file, $this->code_display);
|
|
} else {
|
|
$font_size = $this->image_height * .4;
|
|
$bb = imageftbbox($font_size, 0, $this->ttf_file, $this->code_display);
|
|
$tx = $bb[4] - $bb[0];
|
|
$ty = $bb[5] - $bb[1];
|
|
$x = floor($this->image_width / 2 - $tx / 2 - $bb[0]);
|
|
$y = round($this->image_height / 2 - $ty / 2 - $bb[1]);
|
|
|
|
imagettftext($this->im, $font_size, 0, $x, $y, $this->gdtextcolor, $this->ttf_file, $this->code_display);
|
|
}
|
|
}
|
|
|
|
// DEBUG
|
|
//$this->im = $this->tmpimg;
|
|
//$this->output();
|
|
|
|
}
|
|
|
|
/**
|
|
* Copies the captcha image to the final image with distortion applied
|
|
*/
|
|
protected function distortedCopy()
|
|
{
|
|
$numpoles = 3; // distortion factor
|
|
// make array of poles AKA attractor points
|
|
for ($i = 0; $i < $numpoles; ++ $i) {
|
|
$px[$i] = rand($this->image_width * 0.2, $this->image_width * 0.8);
|
|
$py[$i] = rand($this->image_height * 0.2, $this->image_height * 0.8);
|
|
$rad[$i] = rand($this->image_height * 0.2, $this->image_height * 0.8);
|
|
$tmp = ((- $this->frand()) * 0.15) - .15;
|
|
$amp[$i] = $this->perturbation * $tmp;
|
|
}
|
|
|
|
$bgCol = imagecolorat($this->tmpimg, 0, 0);
|
|
$width2 = $this->iscale * $this->image_width;
|
|
$height2 = $this->iscale * $this->image_height;
|
|
imagepalettecopy($this->im, $this->tmpimg); // copy palette to final image so text colors come across
|
|
// loop over $img pixels, take pixels from $tmpimg with distortion field
|
|
for ($ix = 0; $ix < $this->image_width; ++ $ix) {
|
|
for ($iy = 0; $iy < $this->image_height; ++ $iy) {
|
|
$x = $ix;
|
|
$y = $iy;
|
|
for ($i = 0; $i < $numpoles; ++ $i) {
|
|
$dx = $ix - $px[$i];
|
|
$dy = $iy - $py[$i];
|
|
if ($dx == 0 && $dy == 0) {
|
|
continue;
|
|
}
|
|
$r = sqrt($dx * $dx + $dy * $dy);
|
|
if ($r > $rad[$i]) {
|
|
continue;
|
|
}
|
|
$rscale = $amp[$i] * sin(3.14 * $r / $rad[$i]);
|
|
$x += $dx * $rscale;
|
|
$y += $dy * $rscale;
|
|
}
|
|
$c = $bgCol;
|
|
$x *= $this->iscale;
|
|
$y *= $this->iscale;
|
|
if ($x >= 0 && $x < $width2 && $y >= 0 && $y < $height2) {
|
|
$c = imagecolorat($this->tmpimg, $x, $y);
|
|
}
|
|
if ($c != $bgCol) { // only copy pixels of letters to preserve any background image
|
|
imagesetpixel($this->im, $ix, $iy, $c);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Draws distorted lines on the image
|
|
*/
|
|
protected function drawLines()
|
|
{
|
|
for ($line = 0; $line < $this->num_lines; ++ $line) {
|
|
$x = $this->image_width * (1 + $line) / ($this->num_lines + 1);
|
|
$x += (0.5 - $this->frand()) * $this->image_width / $this->num_lines;
|
|
$y = rand($this->image_height * 0.1, $this->image_height * 0.9);
|
|
|
|
$theta = ($this->frand() - 0.5) * M_PI * 0.7;
|
|
$w = $this->image_width;
|
|
$len = rand($w * 0.4, $w * 0.7);
|
|
$lwid = rand(0, 2);
|
|
|
|
$k = $this->frand() * 0.6 + 0.2;
|
|
$k = $k * $k * 0.5;
|
|
$phi = $this->frand() * 6.28;
|
|
$step = 0.5;
|
|
$dx = $step * cos($theta);
|
|
$dy = $step * sin($theta);
|
|
$n = $len / $step;
|
|
$amp = 1.5 * $this->frand() / ($k + 5.0 / $len);
|
|
$x0 = $x - 0.5 * $len * cos($theta);
|
|
$y0 = $y - 0.5 * $len * sin($theta);
|
|
|
|
$ldx = round(- $dy * $lwid);
|
|
$ldy = round($dx * $lwid);
|
|
|
|
for ($i = 0; $i < $n; ++ $i) {
|
|
$x = $x0 + $i * $dx + $amp * $dy * sin($k * $i * $step + $phi);
|
|
$y = $y0 + $i * $dy - $amp * $dx * sin($k * $i * $step + $phi);
|
|
imagefilledrectangle($this->im, $x, $y, $x + $lwid, $y + $lwid, $this->gdlinecolor);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Draws random noise on the image
|
|
*/
|
|
protected function drawNoise()
|
|
{
|
|
if ($this->noise_level > 10) {
|
|
$noise_level = 10;
|
|
} else {
|
|
$noise_level = $this->noise_level;
|
|
}
|
|
|
|
$t0 = microtime(true);
|
|
|
|
$noise_level *= 125; // an arbitrary number that works well on a 1-10 scale
|
|
|
|
$points = $this->image_width * $this->image_height * $this->iscale;
|
|
$height = $this->image_height * $this->iscale;
|
|
$width = $this->image_width * $this->iscale;
|
|
for ($i = 0; $i < $noise_level; ++$i) {
|
|
$x = rand(10, $width);
|
|
$y = rand(10, $height);
|
|
$size = rand(7, 10);
|
|
if ($x - $size <= 0 && $y - $size <= 0) continue; // dont cover 0,0 since it is used by imagedistortedcopy
|
|
imagefilledarc($this->tmpimg, $x, $y, $size, $size, 0, 360, $this->gdnoisecolor, IMG_ARC_PIE);
|
|
}
|
|
|
|
$t1 = microtime(true);
|
|
|
|
$t = $t1 - $t0;
|
|
|
|
/*
|
|
// DEBUG
|
|
imagestring($this->tmpimg, 5, 25, 30, "$t", $this->gdnoisecolor);
|
|
header('content-type: image/png');
|
|
imagepng($this->tmpimg);
|
|
exit;
|
|
*/
|
|
}
|
|
|
|
/**
|
|
* Print signature text on image
|
|
*/
|
|
protected function addSignature()
|
|
{
|
|
$bbox = imagettfbbox(10, 0, $this->signature_font, $this->image_signature);
|
|
$textlen = $bbox[2] - $bbox[0];
|
|
$x = $this->image_width - $textlen - 5;
|
|
$y = $this->image_height - 3;
|
|
|
|
imagettftext($this->im, 10, 0, $x, $y, $this->gdsignaturecolor, $this->signature_font, $this->image_signature);
|
|
}
|
|
|
|
/**
|
|
* Sends the appropriate image and cache headers and outputs image to the browser
|
|
*/
|
|
protected function output()
|
|
{
|
|
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
|
|
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
|
|
header("Cache-Control: no-store, no-cache, must-revalidate");
|
|
header("Cache-Control: post-check=0, pre-check=0", false);
|
|
header("Pragma: no-cache");
|
|
|
|
switch ($this->image_type) {
|
|
case self::SI_IMAGE_JPEG:
|
|
header("Content-Type: image/jpeg");
|
|
imagejpeg($this->im, null, 90);
|
|
break;
|
|
case self::SI_IMAGE_GIF:
|
|
header("Content-Type: image/gif");
|
|
imagegif($this->im);
|
|
break;
|
|
default:
|
|
header("Content-Type: image/png");
|
|
imagepng($this->im);
|
|
break;
|
|
}
|
|
|
|
imagedestroy($this->im);
|
|
exit();
|
|
}
|
|
|
|
/**
|
|
* Gets the code and returns the binary audio file for the stored captcha code
|
|
* @param string $format WAV only
|
|
*/
|
|
protected function getAudibleCode($format = 'wav')
|
|
{
|
|
// override any format other than wav for now
|
|
// this is due to security issues with MP3 files
|
|
$format = 'wav';
|
|
|
|
$letters = array();
|
|
$code = $this->getCode();
|
|
|
|
if ($code == '') {
|
|
$this->createCode();
|
|
$code = $this->getCode();
|
|
}
|
|
|
|
for($i = 0; $i < strlen($code); ++$i) {
|
|
$letters[] = $code{$i};
|
|
}
|
|
|
|
if ($format == 'mp3') {
|
|
return $this->generateMP3($letters);
|
|
} else {
|
|
return $this->generateWAV($letters);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets a captcha code from a wordlist
|
|
*/
|
|
protected function readCodeFromFile()
|
|
{
|
|
$fp = @fopen($this->wordlist_file, 'rb');
|
|
if (!$fp) return false;
|
|
|
|
$fsize = filesize($this->wordlist_file);
|
|
if ($fsize < 128) return false; // too small of a list to be effective
|
|
|
|
fseek($fp, rand(0, $fsize - 64), SEEK_SET); // seek to a random position of file from 0 to filesize-64
|
|
$data = fread($fp, 64); // read a chunk from our random position
|
|
fclose($fp);
|
|
$data = preg_replace("/\r?\n/", "\n", $data);
|
|
|
|
$start = @strpos($data, "\n", rand(0, 56)) + 1; // random start position
|
|
$end = @strpos($data, "\n", $start); // find end of word
|
|
|
|
if ($start === false) {
|
|
return false;
|
|
} else if ($end === false) {
|
|
$end = strlen($data);
|
|
}
|
|
|
|
return strtolower(substr($data, $start, $end - $start)); // return a line of the file
|
|
}
|
|
|
|
/**
|
|
* Generates a random captcha code from the set character set
|
|
*/
|
|
protected function generateCode()
|
|
{
|
|
$code = '';
|
|
|
|
for($i = 1, $cslen = strlen($this->charset); $i <= $this->code_length; ++$i) {
|
|
$code .= $this->charset{rand(0, $cslen - 1)};
|
|
}
|
|
|
|
//return 'testing'; // debug, set the code to given string
|
|
|
|
return $code;
|
|
}
|
|
|
|
/**
|
|
* Checks the entered code against the value stored in the session or sqlite database, handles case sensitivity
|
|
* Also clears the stored codes if the code was entered correctly to prevent re-use
|
|
*/
|
|
protected function validate()
|
|
{
|
|
$code = $this->getCode();
|
|
// returns stored code, or an empty string if no stored code was found
|
|
// checks the session and sqlite database if enabled
|
|
|
|
if ($this->case_sensitive == false && preg_match('/[A-Z]/', $code)) {
|
|
// case sensitive was set from securimage_show.php but not in class
|
|
// the code saved in the session has capitals so set case sensitive to true
|
|
$this->case_sensitive = true;
|
|
}
|
|
|
|
$code_entered = trim( (($this->case_sensitive) ? $this->code_entered
|
|
: strtolower($this->code_entered))
|
|
);
|
|
$this->correct_code = false;
|
|
|
|
if ($code != '') {
|
|
if ($code == $code_entered) {
|
|
$this->correct_code = true;
|
|
$_SESSION['securimage_code_value'][$this->namespace] = '';
|
|
$_SESSION['securimage_code_ctime'][$this->namespace] = '';
|
|
$this->clearCodeFromDatabase();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return the code from the session or sqlite database if used. If none exists yet, an empty string is returned
|
|
*/
|
|
protected function getCode()
|
|
{
|
|
$code = '';
|
|
|
|
if (isset($_SESSION['securimage_code_value'][$this->namespace]) &&
|
|
trim($_SESSION['securimage_code_value'][$this->namespace]) != '') {
|
|
if ($this->isCodeExpired(
|
|
$_SESSION['securimage_code_ctime'][$this->namespace]) == false) {
|
|
$code = $_SESSION['securimage_code_value'][$this->namespace];
|
|
}
|
|
} else if ($this->use_sqlite_db == true && function_exists('sqlite_open')) {
|
|
// no code in session - may mean user has cookies turned off
|
|
$this->openDatabase();
|
|
$code = $this->getCodeFromDatabase();
|
|
} else { /* no code stored in session or sqlite database, validation will fail */ }
|
|
|
|
return $code;
|
|
}
|
|
|
|
/**
|
|
* Save data to session namespace and database if used
|
|
*/
|
|
protected function saveData()
|
|
{
|
|
$_SESSION['securimage_code_value'][$this->namespace] = $this->code;
|
|
$_SESSION['securimage_code_ctime'][$this->namespace] = time();
|
|
|
|
$this->saveCodeToDatabase();
|
|
}
|
|
|
|
/**
|
|
* Saves the code to the sqlite database
|
|
*/
|
|
protected function saveCodeToDatabase()
|
|
{
|
|
$success = false;
|
|
|
|
$this->openDatabase();
|
|
|
|
if ($this->use_sqlite_db && $this->sqlite_handle !== false) {
|
|
$ip = $_SERVER['REMOTE_ADDR'];
|
|
$time = time();
|
|
$code = $_SESSION['securimage_code_value'][$this->namespace]; // if cookies are disabled the session still exists at this point
|
|
$success = sqlite_query($this->sqlite_handle,
|
|
"INSERT OR REPLACE INTO codes(ip, code, namespace, created)
|
|
VALUES('$ip', '$code', '{$this->namespace}', $time)");
|
|
}
|
|
|
|
return $success !== false;
|
|
}
|
|
|
|
/**
|
|
* Open sqlite database
|
|
*/
|
|
protected function openDatabase()
|
|
{
|
|
$this->sqlite_handle = false;
|
|
|
|
if ($this->use_sqlite_db && function_exists('sqlite_open')) {
|
|
$this->sqlite_handle = sqlite_open($this->sqlite_database, 0666, $error);
|
|
|
|
if ($this->sqlite_handle !== false) {
|
|
$res = sqlite_query($this->sqlite_handle, "PRAGMA table_info(codes)");
|
|
if (sqlite_num_rows($res) == 0) {
|
|
sqlite_query($this->sqlite_handle, "CREATE TABLE codes (ip VARCHAR(32) PRIMARY KEY, code VARCHAR(32) NOT NULL, namespace VARCHAR(32) NOT NULL, created INTEGER)");
|
|
}
|
|
}
|
|
|
|
return $this->sqlite_handle != false;
|
|
}
|
|
|
|
return $this->sqlite_handle;
|
|
}
|
|
|
|
/**
|
|
* Get a code from the sqlite database for ip address
|
|
*/
|
|
protected function getCodeFromDatabase()
|
|
{
|
|
$code = '';
|
|
|
|
if ($this->use_sqlite_db && $this->sqlite_handle !== false) {
|
|
$ip = $_SERVER['REMOTE_ADDR'];
|
|
$ns = sqlite_escape_string($this->namespace);
|
|
|
|
$res = sqlite_query($this->sqlite_handle, "SELECT * FROM codes WHERE ip = '$ip' AND namespace = '$ns'");
|
|
if ($res && sqlite_num_rows($res) > 0) {
|
|
$res = sqlite_fetch_array($res);
|
|
|
|
if ($this->isCodeExpired($res['created']) == false) {
|
|
$code = $res['code'];
|
|
}
|
|
}
|
|
}
|
|
return $code;
|
|
}
|
|
|
|
/**
|
|
* Remove an entered code from the database
|
|
*/
|
|
protected function clearCodeFromDatabase()
|
|
{
|
|
if (is_resource($this->sqlite_handle)) {
|
|
$ip = $_SERVER['REMOTE_ADDR'];
|
|
$ns = sqlite_escape_string($this->namespace);
|
|
|
|
sqlite_query($this->sqlite_handle, "DELETE FROM codes WHERE ip = '$ip' AND namespace = '$ns'");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Deletes old codes from sqlite database
|
|
*/
|
|
protected function purgeOldCodesFromDatabase()
|
|
{
|
|
if ($this->use_sqlite_db && $this->sqlite_handle !== false) {
|
|
$now = time();
|
|
$limit = (!is_numeric($this->expiry_time) || $this->expiry_time < 1) ? 86400 : $this->expiry_time;
|
|
|
|
sqlite_query($this->sqlite_handle, "DELETE FROM codes WHERE $now - created > $limit");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks to see if the captcha code has expired and cannot be used
|
|
* @param unknown_type $creation_time
|
|
*/
|
|
protected function isCodeExpired($creation_time)
|
|
{
|
|
$expired = true;
|
|
|
|
if (!is_numeric($this->expiry_time) || $this->expiry_time < 1) {
|
|
$expired = false;
|
|
} else if (time() - $creation_time < $this->expiry_time) {
|
|
$expired = false;
|
|
}
|
|
|
|
return $expired;
|
|
}
|
|
|
|
/**
|
|
*
|
|
* Generate an MP3 audio file of the captcha image
|
|
*
|
|
* @deprecated 3.0
|
|
*/
|
|
protected function generateMP3()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Generate a wav file given the $letters in the code
|
|
* @todo Add ability to merge 2 sound files together to have random background sounds
|
|
* @param array $letters
|
|
* @return string The binary contents of the wav file
|
|
*/
|
|
protected function generateWAV($letters)
|
|
{
|
|
$data_len = 0;
|
|
$files = array();
|
|
$out_data = '';
|
|
$out_channels = 0;
|
|
$out_samplert = 0;
|
|
$out_bpersample = 0;
|
|
$numSamples = 0;
|
|
$removeChunks = array('LIST', 'DISP', 'NOTE');
|
|
|
|
for ($i = 0; $i < sizeof($letters); ++$i) {
|
|
$letter = $letters[$i];
|
|
$filename = $this->audio_path . strtoupper($letter) . '.wav';
|
|
$file = array();
|
|
$data = @file_get_contents($filename);
|
|
|
|
if ($data === false) {
|
|
// echo "Failed to read $filename";
|
|
return $this->audioError();
|
|
}
|
|
|
|
$header = substr($data, 0, 36);
|
|
$info = unpack('NChunkID/VChunkSize/NFormat/NSubChunk1ID/'
|
|
.'VSubChunk1Size/vAudioFormat/vNumChannels/'
|
|
.'VSampleRate/VByteRate/vBlockAlign/vBitsPerSample',
|
|
$header);
|
|
|
|
$dataPos = strpos($data, 'data');
|
|
$out_channels = $info['NumChannels'];
|
|
$out_samplert = $info['SampleRate'];
|
|
$out_bpersample = $info['BitsPerSample'];
|
|
|
|
if ($dataPos === false) {
|
|
// wav file with no data?
|
|
// echo "Failed to find DATA segment in $filename";
|
|
return $this->audioError();
|
|
}
|
|
|
|
if ($info['AudioFormat'] != 1) {
|
|
// only work with PCM audio
|
|
// echo "$filename was not PCM audio, only PCM is supported";
|
|
return $this->audioError();
|
|
}
|
|
|
|
if ($info['SubChunk1Size'] != 16 && $info['SubChunk1Size'] != 18) {
|
|
// probably unsupported extension
|
|
// echo "Bad SubChunk1Size in $filename - Size was {$info['SubChunk1Size']}";
|
|
return $this->audioError();
|
|
}
|
|
|
|
if ($info['SubChunk1Size'] > 16) {
|
|
$header .= substr($data, 36, $info['SubChunk1Size'] - 16);
|
|
}
|
|
|
|
if ($i == 0) {
|
|
// create the final file's header, size will be adjusted later
|
|
$out_data = $header . 'data';
|
|
}
|
|
|
|
$removed = 0;
|
|
|
|
foreach($removeChunks as $chunk) {
|
|
$chunkPos = strpos($data, $chunk);
|
|
if ($chunkPos !== false) {
|
|
$listSize = unpack('VSize', substr($data, $chunkPos + 4, 4));
|
|
|
|
$data = substr($data, 0, $chunkPos) .
|
|
substr($data, $chunkPos + 8 + $listSize['Size']);
|
|
|
|
$removed += $listSize['Size'] + 8;
|
|
}
|
|
}
|
|
|
|
$dataSize = unpack('VSubchunk2Size', substr($data, $dataPos + 4, 4));
|
|
$dataSize['Subchunk2Size'] -= $removed;
|
|
$out_data .= substr($data, $dataPos + 8, $dataSize['Subchunk2Size'] * ($out_bpersample / 8));
|
|
$numSamples += $dataSize['Subchunk2Size'];
|
|
}
|
|
|
|
$filesize = strlen($out_data);
|
|
$chunkSize = $filesize - 8;
|
|
$dataCSize = $numSamples;
|
|
|
|
$out_data = substr_replace($out_data, pack('V', $chunkSize), 4, 4);
|
|
$out_data = substr_replace($out_data, pack('V', $numSamples), 40 + ($info['SubChunk1Size'] - 16), 4);
|
|
|
|
$this->scrambleAudioData($out_data, 'wav');
|
|
|
|
return $out_data;
|
|
}
|
|
|
|
/**
|
|
* Randomizes the audio data to add noise and prevent binary recognition
|
|
* @param string $data The binary audio file data
|
|
* @param string $format The format of the sound file (wav only)
|
|
*/
|
|
protected function scrambleAudioData(&$data, $format)
|
|
{
|
|
$start = strpos($data, 'data') + 4; // look for "data" indicator
|
|
if ($start === false) $start = 44; // if not found assume 44 byte header
|
|
|
|
$start += rand(1, 4); // randomize starting offset
|
|
$datalen = strlen($data) - $start;
|
|
$step = 1;
|
|
|
|
for ($i = $start; $i < $datalen; $i += $step) {
|
|
$ch = ord($data{$i});
|
|
if ($ch == 0 || $ch == 255) continue;
|
|
|
|
if ($ch < 16 || $ch > 239) {
|
|
$ch += rand(-6, 6);
|
|
} else {
|
|
$ch += rand(-12, 12);
|
|
}
|
|
|
|
if ($ch < 0) $ch = 0; else if ($ch > 255) $ch = 255;
|
|
|
|
$data{$i} = chr($ch);
|
|
|
|
$step = rand(1,4);
|
|
}
|
|
|
|
return $data;
|
|
}
|
|
|
|
/**
|
|
* Return a wav file saying there was an error generating file
|
|
*
|
|
* @return string The binary audio contents
|
|
*/
|
|
protected function audioError()
|
|
{
|
|
return @file_get_contents(dirname(__FILE__) . '/audio/error.wav');
|
|
}
|
|
|
|
function frand()
|
|
{
|
|
return 0.0001 * rand(0,9999);
|
|
}
|
|
|
|
/**
|
|
* Convert an html color code to a Securimage_Color
|
|
* @param string $color
|
|
* @param Securimage_Color $default The defalt color to use if $color is invalid
|
|
*/
|
|
protected function initColor($color, $default)
|
|
{
|
|
if ($color == null) {
|
|
return new Securimage_Color($default);
|
|
} else if (is_string($color)) {
|
|
try {
|
|
return new Securimage_Color($color);
|
|
} catch(Exception $e) {
|
|
return new Securimage_Color($default);
|
|
}
|
|
} else if (is_array($color) && sizeof($color) == 3) {
|
|
return new Securimage_Color($color[0], $color[1], $color[2]);
|
|
} else {
|
|
return new Securimage_Color($default);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Color object for Securimage CAPTCHA
|
|
*
|
|
* @version 3.0
|
|
* @since 2.0
|
|
* @package Securimage
|
|
* @subpackage classes
|
|
*
|
|
*/
|
|
class Securimage_Color
|
|
{
|
|
public $r;
|
|
public $g;
|
|
public $b;
|
|
|
|
/**
|
|
* Create a new Securimage_Color object.<br />
|
|
* Constructor expects 1 or 3 arguments.<br />
|
|
* When passing a single argument, specify the color using HTML hex format,<br />
|
|
* when passing 3 arguments, specify each RGB component (from 0-255) individually.<br />
|
|
* $color = new Securimage_Color('#0080FF') or <br />
|
|
* $color = new Securimage_Color(0, 128, 255)
|
|
*
|
|
* @param string $color
|
|
* @throws Exception
|
|
*/
|
|
public function __construct($color = '#ffffff')
|
|
{
|
|
$args = func_get_args();
|
|
|
|
if (sizeof($args) == 0) {
|
|
$this->r = 255;
|
|
$this->g = 255;
|
|
$this->b = 255;
|
|
} else if (sizeof($args) == 1) {
|
|
// set based on html code
|
|
if (substr($color, 0, 1) == '#') {
|
|
$color = substr($color, 1);
|
|
}
|
|
|
|
if (strlen($color) != 3 && strlen($color) != 6) {
|
|
throw new InvalidArgumentException(
|
|
'Invalid HTML color code passed to Securimage_Color'
|
|
);
|
|
}
|
|
|
|
$this->constructHTML($color);
|
|
} else if (sizeof($args) == 3) {
|
|
$this->constructRGB($args[0], $args[1], $args[2]);
|
|
} else {
|
|
throw new InvalidArgumentException(
|
|
'Securimage_Color constructor expects 0, 1 or 3 arguments; ' . sizeof($args) . ' given'
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Construct from an rgb triplet
|
|
* @param int $red The red component, 0-255
|
|
* @param int $green The green component, 0-255
|
|
* @param int $blue The blue component, 0-255
|
|
*/
|
|
protected function constructRGB($red, $green, $blue)
|
|
{
|
|
if ($red < 0) $red = 0;
|
|
if ($red > 255) $red = 255;
|
|
if ($green < 0) $green = 0;
|
|
if ($green > 255) $green = 255;
|
|
if ($blue < 0) $blue = 0;
|
|
if ($blue > 255) $blue = 255;
|
|
|
|
$this->r = $red;
|
|
$this->g = $green;
|
|
$this->b = $blue;
|
|
}
|
|
|
|
/**
|
|
* Construct from an html hex color code
|
|
* @param string $color
|
|
*/
|
|
protected function constructHTML($color)
|
|
{
|
|
if (strlen($color) == 3) {
|
|
$red = str_repeat(substr($color, 0, 1), 2);
|
|
$green = str_repeat(substr($color, 1, 1), 2);
|
|
$blue = str_repeat(substr($color, 2, 1), 2);
|
|
} else {
|
|
$red = substr($color, 0, 2);
|
|
$green = substr($color, 2, 2);
|
|
$blue = substr($color, 4, 2);
|
|
}
|
|
|
|
$this->r = hexdec($red);
|
|
$this->g = hexdec($green);
|
|
$this->b = hexdec($blue);
|
|
}
|
|
}
|