Tweaked LDAP TLS Implementation

- Moved the ldap function out to our separate service for easier
  testing.
- Added testing for the option.
- Moved tls_insecure part back up above connection start as found more
  reliable there.

Done a lot of real-connection testing during this review.
Used wireshare to ensure TLS connection does take place.
Found LDAP_TLS_INSECURE=false can action unreliably, restarting php-fpm
helped.
Tested both trusted and untrusted certificates.
This commit is contained in:
Dan Brown 2021-02-07 20:00:04 +00:00
parent f177b02cae
commit af032f8993
4 changed files with 51 additions and 23 deletions

View File

@ -31,6 +31,14 @@ class Ldap
return ldap_set_option($ldapConnection, $option, $value);
}
/**
* Start TLS on the given LDAP connection.
*/
public function startTls($ldapConnection): bool
{
return ldap_start_tls($ldapConnection);
}
/**
* Set the version number for the given ldap connection.
* @param $ldapConnection

View File

@ -187,6 +187,12 @@ class LdapService extends ExternalAuthService
throw new LdapException(trans('errors.ldap_extension_not_installed'));
}
// Disable certificate verification.
// This option works globally and must be set before a connection is created.
if ($this->config['tls_insecure']) {
$this->ldap->setOption(null, LDAP_OPT_X_TLS_REQUIRE_CERT, LDAP_OPT_X_TLS_NEVER);
}
$serverDetails = $this->parseServerString($this->config['server']);
$ldapConnection = $this->ldap->connect($serverDetails['host'], $serverDetails['port']);
@ -199,19 +205,12 @@ class LdapService extends ExternalAuthService
$this->ldap->setVersion($ldapConnection, $this->config['version']);
}
// Check if TLS_INSECURE is set. The handle is set to NULL due to the nature of
// the LDAP_OPT_X_TLS_REQUIRE_CERT option. It can only be set globally and not per handle.
if ($this->config['tls_insecure']) {
// Setting also ignored?
$this->ldap->setOption($ldapConnection, LDAP_OPT_X_TLS_REQUIRE_CERT, LDAP_OPT_X_TLS_NEVER);
}
// Start and verify TLS if it's enabled
if ($this->config['start_tls']) {
// "&& $this->config['tls_cacertfile']" this condition was removed because:
// This ldap option is totally ignored by PHP. (bug: https://bugs.php.net/bug.php?id=73558)
// If we set 'TLS_CACERT /config/ca/bundle.pem' into /etc/openldap/ldap.conf and restart php, ldap_start_tls works.
//$this->ldap->setOption($ldapConnection, LDAP_OPT_X_TLS_CACERTFILE, $this->config['tls_cacertfile']);
ldap_start_tls($ldapConnection);
$started = $this->ldap->startTls($ldapConnection);
if (!$started) {
throw new LdapException('Could not start TLS connection');
}
}
$this->ldapConnection = $ldapConnection;

View File

@ -36,6 +36,7 @@
<server name="AUTH_METHOD" value="standard"/>
<server name="DISABLE_EXTERNAL_SERVICES" value="true"/>
<server name="AVATAR_URL" value=""/>
<server name="LDAP_START_TLS" value="false"/>
<server name="LDAP_VERSION" value="3"/>
<server name="SESSION_SECURE_COOKIE" value="null"/>
<server name="STORAGE_TYPE" value="local"/>

View File

@ -4,6 +4,7 @@ use BookStack\Auth\Access\LdapService;
use BookStack\Auth\Role;
use BookStack\Auth\Access\Ldap;
use BookStack\Auth\User;
use BookStack\Exceptions\LdapException;
use Mockery\MockInterface;
use Tests\BrowserKitTest;
@ -40,6 +41,14 @@ class LdapTest extends BrowserKitTest
$this->mockUser = factory(User::class)->make();
}
protected function runFailedAuthLogin()
{
$this->commonLdapMocks(1, 1, 1, 1, 1);
$this->mockLdap->shouldReceive('searchAndGetEntries')->times(1)
->andReturn(['count' => 0]);
$this->post('/login', ['username' => 'timmyjenkins', 'password' => 'cattreedog']);
}
protected function mockEscapes($times = 1)
{
$this->mockLdap->shouldReceive('escape')->times($times)->andReturnUsing(function($val) {
@ -550,6 +559,22 @@ class LdapTest extends BrowserKitTest
]);
}
public function test_start_tls_called_if_option_set()
{
config()->set(['services.ldap.start_tls' => true]);
$this->mockLdap->shouldReceive('startTls')->once()->andReturn(true);
$this->runFailedAuthLogin();
}
public function test_connection_fails_if_tls_fails()
{
config()->set(['services.ldap.start_tls' => true]);
$this->mockLdap->shouldReceive('startTls')->once()->andReturn(false);
$this->commonLdapMocks(1, 1, 0, 0, 0);
$this->post('/login', ['username' => 'timmyjenkins', 'password' => 'cattreedog']);
$this->assertResponseStatus(500);
}
public function test_ldap_attributes_can_be_binary_decoded_if_marked()
{
config()->set(['services.ldap.id_attribute' => 'BIN;uid']);
@ -640,12 +665,7 @@ class LdapTest extends BrowserKitTest
{
$log = $this->withTestLogger();
config()->set(['logging.failed_login.message' => 'Failed login for %u']);
$this->commonLdapMocks(1, 1, 1, 1, 1);
$this->mockLdap->shouldReceive('searchAndGetEntries')->times(1)
->andReturn(['count' => 0]);
$this->post('/login', ['username' => 'timmyjenkins', 'password' => 'cattreedog']);
$this->runFailedAuthLogin();
$this->assertTrue($log->hasWarningThatContains('Failed login for timmyjenkins'));
}
}