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-rw-r--r--framework/Web/UI/WebControls/TCaptcha.php6
-rw-r--r--framework/Web/UI/WebControls/TCaptchaValidator.php6
-rw-r--r--framework/Web/UI/WebControls/TReCaptcha.php199
-rw-r--r--framework/Web/UI/WebControls/TReCaptchaValidator.php72
4 files changed, 281 insertions, 2 deletions
diff --git a/framework/Web/UI/WebControls/TCaptcha.php b/framework/Web/UI/WebControls/TCaptcha.php
index 9ca6aa76..7eff1294 100644
--- a/framework/Web/UI/WebControls/TCaptcha.php
+++ b/framework/Web/UI/WebControls/TCaptcha.php
@@ -4,7 +4,7 @@
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.pradosoft.com/
- * @copyright Copyright &copy; 2005-2011 PradoSoft
+ * @copyright Copyright &copy; 2005-2011 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Web.UI.WebControls
@@ -15,6 +15,10 @@ Prado::using('System.Web.UI.WebControls.TImage');
/**
* TCaptcha class.
*
+ * Notice: while this class is easy to use and implement, it does not provide full security.
+ * In fact, it's easy to bypass the checks reusing old, already-validated tokens (reply attack).
+ * A better alternative is provided by {@link TReCaptcha}.
+ *
* TCaptcha displays a CAPTCHA (a token displayed as an image) that can be used
* to determine if the input is entered by a real user instead of some program.
*
diff --git a/framework/Web/UI/WebControls/TCaptchaValidator.php b/framework/Web/UI/WebControls/TCaptchaValidator.php
index 7854b639..b01cd786 100644
--- a/framework/Web/UI/WebControls/TCaptchaValidator.php
+++ b/framework/Web/UI/WebControls/TCaptchaValidator.php
@@ -4,7 +4,7 @@
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.pradosoft.com/
- * @copyright Copyright &copy; 2005-2011 PradoSoft
+ * @copyright Copyright &copy; 2005-2011 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Web.UI.WebControls
@@ -16,6 +16,10 @@ Prado::using('System.Web.UI.WebControls.TCaptcha');
/**
* TCaptchaValidator class
*
+ * Notice: while this class is easy to use and implement, it does not provide full security.
+ * In fact, it's easy to bypass the checks reusing old, already-validated tokens (reply attack).
+ * A better alternative is provided by {@link TReCaptchaValidator}.
+ *
* TCaptchaValidator validates user input against a CAPTCHA represented by
* a {@link TCaptcha} control. The input control fails validation if its value
* is not the same as the token displayed in CAPTCHA. Note, if the user does
diff --git a/framework/Web/UI/WebControls/TReCaptcha.php b/framework/Web/UI/WebControls/TReCaptcha.php
new file mode 100644
index 00000000..bb956bcb
--- /dev/null
+++ b/framework/Web/UI/WebControls/TReCaptcha.php
@@ -0,0 +1,199 @@
+<?php
+
+/**
+ * TReCaptcha class file
+ *
+ * @author Bérczi Gábor <gabor.berczi@devworx.hu>
+ * @link http://www.devworx.hu/
+ * @copyright Copyright &copy; 2011 DevWorx
+ * @license http://www.pradosoft.com/license/
+ * @package System.Web.UI.WebControls
+ */
+
+ Prado::using('System.3rdParty.ReCaptcha.recaptchalib');
+
+/**
+ * TReCaptcha class.
+ *
+ * TReCaptcha displays a reCAPTCHA (a token displayed as an image) that can be used
+ * to determine if the input is entered by a real user instead of some program. It can
+ * also prevent multiple submits of the same form either by accident, or on purpose (ie. spamming).
+ *
+ * The reCAPTCHA to solve (a string consisting of two separate words) displayed is automatically
+ * generated by the reCAPTCHA system at recaptcha.net. However, in order to use the services
+ * of the site you will need to register and get a public and a private API key pair, and
+ * supply those to the reCAPTCHA control through setting the {@link setPrivateKey PrivateKey}
+ * and {@link setPublicKey PublicKey} properties.
+ *
+ * Currently the reCAPTCHA API supports only one reCAPTCHA field per page, so you MUST make sure that all
+ * your input is protected and validated by a single reCAPTCHA control. Placing more than one reCAPTCHA
+ * control on the page will lead to unpredictable results, and the user will most likely unable to solve
+ * any of them successfully.
+ *
+ * Upon postback, user input can be validated by calling {@link validate()}.
+ * The {@link TReCaptchaValidator} control can also be used to do validation, which provides
+ * server-side validation. Calling (@link validate()) will invalidate the token supplied, so all consecutive
+ * calls to the method - without solving a new captcha - will return false. Therefore if implementing a multi-stage
+ * input process, you must make sure that you call validate() only once, either at the end of the input process, or
+ * you store the result till the end of the processing.
+ *
+ * The following template shows a typical use of TReCaptcha control:
+ * <code>
+ * <com:TReCaptcha ID="Captcha"
+ * PublicKey="..."
+ * PrivateKey="..."
+ * />
+ * <com:TReCaptchaValidator ControlToValidate="Captcha"
+ * ErrorMessage="You are challenged!" />
+ * </code>
+ *
+ * @author Bérczi Gábor <gabor.berczi@devworx.hu>
+ * @package System.Web.UI.WebControls
+ * @since 3.2
+ */
+class TReCaptcha extends TControl implements IValidatable
+{
+ private $_isValid=true;
+
+ const ChallengeFieldName = 'recaptcha_challenge_field';
+ const ResponseFieldName = 'recaptcha_response_field';
+
+ /**
+ * Returns true if this control validated successfully.
+ * Defaults to true.
+ * @return bool wether this control validated successfully.
+ */
+ public function getIsValid()
+ {
+ return $this->_isValid;
+ }
+ /**
+ * @param bool wether this control is valid.
+ */
+ public function setIsValid($value)
+ {
+ $this->_isValid=TPropertyValue::ensureBoolean($value);
+ }
+
+ public function getValidationPropertyValue()
+ {
+ return $this->Request[$this->getChallengeFieldName()];
+ }
+
+ public function getPublicKey()
+ {
+ return $this->getViewState('PublicKey');
+ }
+
+ public function setPublicKey($value)
+ {
+ return $this->setViewState('PublicKey', TPropertyValue::ensureString($value));
+ }
+
+ public function getPrivateKey()
+ {
+ return $this->getViewState('PrivateKey');
+ }
+
+ public function setPrivateKey($value)
+ {
+ return $this->setViewState('PrivateKey', TPropertyValue::ensureString($value));
+ }
+
+ public function getThemeName()
+ {
+ return $this->getViewState('ThemeName');
+ }
+
+ public function setThemeName($value)
+ {
+ return $this->setViewState('ThemeName', TPropertyValue::ensureString($value));
+ }
+
+ public function getCustomTranslations()
+ {
+ return TPropertyValue::ensureArray($this->getViewState('CustomTranslations'));
+ }
+
+ public function setCustomTranslations($value)
+ {
+ return $this->setViewState('CustomTranslations', TPropertyValue::ensureArray($value));
+ }
+
+ public function getLanguage()
+ {
+ return $this->getViewState('Language');
+ }
+
+ public function setLanguage($value)
+ {
+ return $this->setViewState('Language', TPropertyValue::ensureString($value));
+ }
+
+ protected function getChallengeFieldName()
+ {
+ return /*$this->ClientID.'_'.*/self::ChallengeFieldName;
+ }
+
+ protected function getResponseFieldName()
+ {
+ return /*$this->ClientID.'_'.*/self::ResponseFieldName;
+ }
+
+ public function getClientSideOptions()
+ {
+ $options = array();
+ if ($theme = $this->getThemeName())
+ $options['theme'] = $theme;
+ if ($lang = $this->getLanguage())
+ $options['lang'] = $lang;
+ if ($trans = $this->getCustomTranslations())
+ $options['custom_translations'] = $trans;
+ return $options;
+ }
+
+ public function validate()
+ {
+ $resp = recaptcha_check_answer(
+ $this->getPrivateKey(),
+ $_SERVER["REMOTE_ADDR"],
+ $_POST[$this->getChallengeFieldName()],
+ $_POST[$this->getResponseFieldName()]
+ );
+ return ($resp->is_valid==1);
+ }
+
+ /**
+ * Checks for API keys
+ * @param mixed event parameter
+ */
+ public function onPreRender($param)
+ {
+ parent::onPreRender($param);
+ if("" == $this->getPublicKey())
+ throw new TConfigurationException('recaptcha_publickey_unknown');
+ if("" == $this->getPrivateKey())
+ throw new TConfigurationException('recaptcha_privatekey_unknown');
+ }
+
+ public function render($writer)
+ {
+ $writer->write(TJavaScript::renderScriptBlock(
+ 'var RecaptchaOptions = '.TJavaScript::jsonEncode($this->getClientSideOptions()).';'
+ ));
+
+ $html = recaptcha_get_html($this->getPublicKey());
+ /*
+ reCAPTCHA currently does not support multiple validations per page
+ $html = str_replace(
+ array(self::ChallengeFieldName,self::ResponseFieldName),
+ array($this->getChallengeFieldName(),$this->getResponseFieldName()),
+ $html
+ );
+ */
+ $writer->write($html);
+ }
+
+}
+
+?> \ No newline at end of file
diff --git a/framework/Web/UI/WebControls/TReCaptchaValidator.php b/framework/Web/UI/WebControls/TReCaptchaValidator.php
new file mode 100644
index 00000000..ae94ea59
--- /dev/null
+++ b/framework/Web/UI/WebControls/TReCaptchaValidator.php
@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * TReCaptchaValidator class file
+ *
+ * @author Bérczi Gábor <gabor.berczi@devworx.hu>
+ * @link http://www.devworx.hu/
+ * @copyright Copyright &copy; 2011 DevWorx
+ * @license http://www.pradosoft.com/license/
+ * @package System.Web.UI.WebControls
+ */
+
+Prado::using('System.Web.UI.WebControls.TBaseValidator');
+Prado::using('System.Web.UI.WebControls.TReCaptcha');
+
+/**
+ * TReCaptchaValidator class
+ *
+ * TReCaptchaValidator validates user input against a reCAPTCHA represented by
+ * a {@link TReCaptcha} control. The input control fails validation if its value
+ * is not the same as the token displayed in reCAPTCHA. Note, if the user does
+ * not enter any thing, it is still considered as failing the validation.
+ *
+ * To use TReCaptchaValidator, specify the {@link setControlToValidate ControlToValidate}
+ * to be the ID path of the {@link TReCaptcha} control.
+ *
+ * @author Bérczi Gábor <gabor.berczi@devworx.hu>
+ * @package System.Web.UI.WebControls
+ * @since 3.2
+ */
+class TReCaptchaValidator extends TBaseValidator
+{
+ protected $_isvalid = null;
+
+ /**
+ * Gets the name of the javascript class responsible for performing validation for this control.
+ * This method overrides the parent implementation.
+ * @return string the javascript class name
+ */
+ protected function getClientClassName()
+ {
+ return '';
+ }
+
+ public function getEnableClientScript()
+ {
+ return false;
+ }
+
+ /**
+ * This method overrides the parent's implementation.
+ * The validation succeeds if the input control has the same value
+ * as the one displayed in the corresponding RECAPTCHA control.
+ *
+ * @return boolean whether the validation succeeds
+ */
+ protected function evaluateIsValid()
+ {
+ // check validity only once (if trying to evaluate multiple times, all redundant checks would fail)
+ if (is_null($this->_isvalid))
+ {
+ $control = $this->getValidationTarget();
+ if(!($control instanceof TCaptcha))
+ throw new TConfigurationException('recaptchavalidator_captchacontrol_invalid');
+ $this->_isvalid = $control->validate();
+ }
+ return ($this->_isvalid==true);
+ }
+
+}
+
+?> \ No newline at end of file
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