Knah-Tsaeb/MyShaarli
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Refactor client session hijacking protection

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Signed-off-by: VirtualTam <virtualtam@flibidi.net>
This commit is contained in:
VirtualTam 2018-02-16 21:51:44 +01:00
parent 8f816d8ddf
commit 88110550b8
3 changed files with 86 additions and 13 deletions
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33
application/HttpUtils.php
View file

@ -1,7 +1,7 @@
<?php
/**
* GET an HTTP URL to retrieve its content
* Uses the cURL library or a fallback method
* Uses the cURL library or a fallback method
*
* @param string $url URL to get (http://...)
* @param int $timeout network timeout (in seconds)
@ -415,6 +415,37 @@ function getIpAddressFromProxy($server, $trustedIps)
return array_pop($ips);
}
/**
* Return an identifier based on the advertised client IP address(es)
*
* This aims at preventing session hijacking from users behind the same proxy
* by relying on HTTP headers.
*
* See:
* - https://secure.php.net/manual/en/reserved.variables.server.php
* - https://stackoverflow.com/questions/3003145/how-to-get-the-client-ip-address-in-php
* - https://stackoverflow.com/questions/12233406/preventing-session-hijacking
* - https://stackoverflow.com/questions/21354859/trusting-x-forwarded-for-to-identify-a-visitor
*
* @param array $server The $_SERVER array
*
* @return string An identifier based on client IP address information
*/
function client_ip_id($server)
{
$ip = $server['REMOTE_ADDR'];
if (isset($server['HTTP_X_FORWARDED_FOR'])) {
$ip = $ip . '_' . $server['HTTP_X_FORWARDED_FOR'];
}
if (isset($server['HTTP_CLIENT_IP'])) {
$ip = $ip . '_' . $server['HTTP_CLIENT_IP'];
}
return $ip;
}
/**
* Returns true if Shaarli's currently browsed in HTTPS.
* Supports reverse proxies (if the headers are correctly set).

14
index.php
View file

@ -207,7 +207,7 @@ function setup_login_state($conf)
}
// If session does not exist on server side, or IP address has changed, or session has expired, logout.
if (empty($_SESSION['uid'])
|| ($conf->get('security.session_protection_disabled') === false && $_SESSION['ip'] != allIPs())
|| ($conf->get('security.session_protection_disabled') === false && $_SESSION['ip'] != client_ip_id($_SERVER))
|| time() >= $_SESSION['expires_on'])
{
logout();
@ -231,16 +231,6 @@ $userIsLoggedIn = setup_login_state($conf);
// ------------------------------------------------------------------------------------------
// Session management
// Returns the IP address of the client (Used to prevent session cookie hijacking.)
function allIPs()
{
$ip = $_SERVER['REMOTE_ADDR'];
// Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
return $ip;
}
/**
* Load user session.
*
@ -249,7 +239,7 @@ function allIPs()
function fillSessionInfo($conf)
{
$_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
$_SESSION['ip']=allIPs(); // We store IP address(es) of the client to make sure session is not hijacked.
$_SESSION['ip'] = client_ip_id($_SERVER);
$_SESSION['username']= $conf->get('credentials.login');
$_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Set session expiration.
}

52
tests/HttpUtils/ClientIpIdTest.php Normal file
View file

@ -0,0 +1,52 @@
<?php
/**
* HttpUtils' tests
*/
require_once 'application/HttpUtils.php';
/**
* Unitary tests for client_ip_id()
*/
class ClientIpIdTest extends PHPUnit_Framework_TestCase
{
/**
* Get a remote client ID based on its IP
*/
public function testClientIpIdRemote()
{
$this->assertEquals(
'10.1.167.42',
client_ip_id(['REMOTE_ADDR' => '10.1.167.42'])
);
}
/**
* Get a remote client ID based on its IP and proxy information (1)
*/
public function testClientIpIdRemoteForwarded()
{
$this->assertEquals(
'10.1.167.42_127.0.1.47',
client_ip_id([
'REMOTE_ADDR' => '10.1.167.42',
'HTTP_X_FORWARDED_FOR' => '127.0.1.47'
])
);
}
/**
* Get a remote client ID based on its IP and proxy information (2)
*/
public function testClientIpIdRemoteForwardedClient()
{
$this->assertEquals(
'10.1.167.42_10.1.167.56_127.0.1.47',
client_ip_id([
'REMOTE_ADDR' => '10.1.167.42',
'HTTP_X_FORWARDED_FOR' => '10.1.167.56',
'HTTP_CLIENT_IP' => '127.0.1.47'
])
);
}
}