diff --git a/config-templates/authsources.php b/config-templates/authsources.php
index 72b14a75c35770ff841d4e420af094d5c8d1c0a3..aa3a9be21dfad6d565d6cb7e245ed44c14cfa192 100644
--- a/config-templates/authsources.php
+++ b/config-templates/authsources.php
@@ -100,6 +100,8 @@ $config = array(
// 'sreg.validate' => FALSE,
'attributes.ax_required' => array('http://axschema.org/namePerson/friendly'),
'attributes.ax_optional' => array('http://axschema.org/namePerson','http://axschema.org/contact/email'),
+ // Prefer HTTP redirect over POST
+ // 'prefer_http_redirect' => FALSE,
),
*/
diff --git a/modules/openid/lib/Auth/Source/OpenIDConsumer.php b/modules/openid/lib/Auth/Source/OpenIDConsumer.php
index b983260a0cc6e0ac7cc60071fbcfb2b4e45f7049..67a73b26c6d2428fdd1cde8fe5a40ea8bf5aeb68 100644
--- a/modules/openid/lib/Auth/Source/OpenIDConsumer.php
+++ b/modules/openid/lib/Auth/Source/OpenIDConsumer.php
@@ -61,6 +61,11 @@ class sspmod_openid_Auth_Source_OpenIDConsumer extends SimpleSAML_Auth_Source {
*/
private $extensionArgs;
+ /**
+ * Prefer HTTP Redirect over HTML Form Redirection (POST)
+ */
+ private $preferHttpRedirect;
+
/**
* Constructor for this authentication source.
*
@@ -87,6 +92,8 @@ class sspmod_openid_Auth_Source_OpenIDConsumer extends SimpleSAML_Auth_Source {
$this->validateSReg = $cfgParse->getBoolean('sreg.validate',TRUE);
$this->extensionArgs = $cfgParse->getArray('extension.args', array());
+
+ $this->preferHttpRedirect = $cfgParse->getBoolean('prefer_http_redirect', FALSE);
}
@@ -225,9 +232,12 @@ class sspmod_openid_Auth_Source_OpenIDConsumer extends SimpleSAML_Auth_Source {
// Store the token for this authentication so we can verify the
// response.
- // For OpenID 1, send a redirect. For OpenID 2, use a Javascript
- // form to send a POST request to the server.
- if ($auth_request->shouldSendRedirect()) {
+ // For OpenID 1, send a redirect. For OpenID 2, use a Javascript form
+ // to send a POST request to the server or use redirect if
+ // prefer_http_redirect is enabled and redirect URL size
+ // is less than 2049
+ $should_send_redirect = $auth_request->shouldSendRedirect();
+ if ($this->preferHttpRedirect || $should_send_redirect) {
$redirect_url = $auth_request->redirectURL($this->getTrustRoot(), $this->getReturnTo($stateId));
// If the redirect URL can't be built, display an error message.
@@ -235,22 +245,26 @@ class sspmod_openid_Auth_Source_OpenIDConsumer extends SimpleSAML_Auth_Source {
throw new SimpleSAML_Error_AuthSource($this->authId, 'Could not redirect to server: ' . var_export($redirect_url->message, TRUE));
}
- SimpleSAML_Utilities::redirect($redirect_url);
- } else {
- // Generate form markup and render it.
- $form_id = 'openid_message';
- $form_html = $auth_request->formMarkup($this->getTrustRoot(), $this->getReturnTo($stateId), FALSE, array('id' => $form_id));
-
- // Display an error if the form markup couldn't be generated; otherwise, render the HTML.
- if (Auth_OpenID::isFailure($form_html)) {
- throw new SimpleSAML_Error_AuthSource($this->authId, 'Could not redirect to server: ' . var_export($form_html->message, TRUE));
- } else {
- echo '<html><head><title>OpenID transaction in progress</title></head>
- <body onload=\'document.getElementById("' . $form_id . '").submit()\'>' .
- $form_html . '</body></html>';
- exit;
+ // For OpenID 2 failover to POST if redirect URL is longer than 2048
+ if ($should_send_redirect || strlen($redirect_url) <= 2048) {
+ SimpleSAML_Utilities::redirect($redirect_url);
+ assert('FALSE');
}
}
+
+ // Generate form markup and render it.
+ $form_id = 'openid_message';
+ $form_html = $auth_request->formMarkup($this->getTrustRoot(), $this->getReturnTo($stateId), FALSE, array('id' => $form_id));
+
+ // Display an error if the form markup couldn't be generated; otherwise, render the HTML.
+ if (Auth_OpenID::isFailure($form_html)) {
+ throw new SimpleSAML_Error_AuthSource($this->authId, 'Could not redirect to server: ' . var_export($form_html->message, TRUE));
+ } else {
+ echo '<html><head><title>OpenID transaction in progress</title></head>
+ <body onload=\'document.getElementById("' . $form_id . '").submit()\'>' .
+ $form_html . '</body></html>';
+ exit;
+ }
}