Negotiate::external() - Code Metrics - Inspection of "Fix incorrect static calls" - simplesamlphp/simplesamlphp-module-negotiateext - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 9daad1...6e8052 )

by Tim

created 2022-01-09 00:21 UTC

Negotiate::external() B

↳ Parent: Project

Complexity

Conditions	7
Paths	10

Size

Total Lines	44
Code Lines	22

Duplication

Lines	0
Ratio	0 %

Importance

Changes	2
Bugs	0	Features	0

Metric	Value
cc	7
eloc	22
c	2
b	0
f	0
nc	10
nop	0
dl	0
loc	44
rs	8.6346

<?php

declare(strict_types=1);

namespace SimpleSAML\Module\negotiateext\Auth\Source;

use Exception;
use SimpleSAML\Assert\Assert;
use SimpleSAML\Auth;
use SimpleSAML\Error;
use SimpleSAML\Logger;
use SimpleSAML\Module;
use SimpleSAML\Module\ldap\Auth\Ldap;
use SimpleSAML\Session;
use SimpleSAML\Utils;

/**
 * The Negotiate module. Allows for password-less, secure login by Kerberos and Negotiate.
 *
 * @package simplesamlphp/simplesamlphp-module-negotiate
 */

class Negotiate extends \SimpleSAML\Auth\Source
{
    // Constants used in the module
    public const STAGEID = '\SimpleSAML\Module\negotiateext\Auth\Source\Negotiate.StageId';

    /** @var \SimpleSAML\Module\ldap\Auth\Ldap */
    protected Ldap $ldap;

    /** @var string */
    protected string $backend = '';

    /** @var string */
    protected string $hostname = '';

    /** @var int */
    protected int $port = 389;

    /** @var bool */
    protected bool $referrals = true;

    /** @var bool */
    protected bool $enableTLS = false;

    /** @var bool */
    protected bool $debugLDAP = false;

    /** @var int */
    protected int $timeout = 30;

    /** @var string */
    protected string $keytab = '';

    /** @var array */
    protected array $base = [];

    /** @var array */
    protected array $attr = ['uid'];

    /** @var array|null */
    protected ?array $subnet = null;

    /** @var string|null */
    protected ?string $admin_user = null;

    /** @var string|null */
    protected ?string $admin_pw = null;

    /** @var array|null */
    protected ?array $attributes = null;

    /** @var array */
    protected array $binaryAttributes = [];


    /**
     * Constructor for this authentication source.
     *
     * @param array $info Information about this authentication source.
     * @param array $config The configuration of the module
     */
    public function __construct(array $info, array $config)
    {
        // call the parent constructor first, as required by the interface
        parent::__construct($info, $config);

        $cfg = \SimpleSAML\Configuration::loadFromArray($config);

        $this->backend = $cfg->getString('fallback');
        $this->hostname = $cfg->getString('hostname');
        $this->port = $cfg->getInteger('port', 389);
        $this->referrals = $cfg->getBoolean('referrals', true);
        $this->enableTLS = $cfg->getBoolean('enable_tls', false);
        $this->debugLDAP = $cfg->getBoolean('debugLDAP', false);
        $this->timeout = $cfg->getInteger('timeout', 30);
        $this->base = $cfg->getArrayizeString('base');
        $this->attr = $cfg->getArrayizeString('attr', 'uid');
        $this->subnet = $cfg->getArray('subnet', null);
        $this->admin_user = $cfg->getString('adminUser', null);
        $this->admin_pw = $cfg->getString('adminPassword', null);
        $this->attributes = $cfg->getArray('attributes', null);
        $this->binaryAttributes = $cfg->getArray('attributes.binary', []);
    }


    /**
     * The inner workings of the module.
     *
     * Checks to see if client is in the defined subnets (if defined in config). Sends the client a 401 Negotiate and
     * responds to the result. If the client fails to provide a proper Kerberos ticket, the login process is handed over
     * to the 'fallback' module defined in the config.
     *
     * LDAP is used as a user metadata source.
     *
     * @param array &$state Information about the current authentication.
     */
    public function authenticate(array &$state): void
    {
        // set the default backend to config
        $state['LogoutState'] = [
            'negotiate:backend' => $this->backend,
        ];
        $state['negotiate:authId'] = $this->authId;


        // check for disabled SPs. The disable flag is store in the SP metadata
        if (array_key_exists('SPMetadata', $state) && $this->spDisabledInMetadata($state['SPMetadata'])) {
            $this->fallBack($state);
        }
        /* Go straight to fallback if Negotiate is disabled or if you are sent back to the IdP directly from the SP
        after having logged out. */
        $session = \SimpleSAML\Session::getSessionFromRequest();
        $disabled = $session->getData('negotiate:disable', 'session');

        if (
            $disabled ||
            (!empty($_REQUEST['negotiateext_auth']) &&
                $_REQUEST['negotiateext_auth'] == 'false') ||
            (!empty($_COOKIE['NEGOTIATE_AUTOLOGIN_DISABLE_PERMANENT']) &&
                $_COOKIE['NEGOTIATE_AUTOLOGIN_DISABLE_PERMANENT'] == 'True')
        ) {
            Logger::debug('Negotiate - session disabled. falling back');
            $this->fallBack($state);
            // never executed
            assert(false);
        }
        $mask = $this->checkMask();
        if (!$mask) {
            $this->fallBack($state);
            // never executed
            assert(false);
        }

        // No auth token. Send it.
        Logger::debug('Negotiate - authenticate(): Sending Negotiate.');
        // Save the $state array, so that we can restore if after a redirect
        Logger::debug('Negotiate - fallback: ' . $state['LogoutState']['negotiate:backend']);
        $id = \SimpleSAML\Auth\State::saveState($state, self::STAGEID);
        $params = ['AuthState' => $id];

        $this->sendNegotiate($params);
        exit;
    }


    /**
     * @param array $spMetadata
     * @return bool
     */
    public function spDisabledInMetadata(array $spMetadata): bool
    {
        if (array_key_exists('negotiate:disable', $spMetadata)) {
            if ($spMetadata['negotiate:disable'] == true) {
                Logger::debug('Negotiate - SP disabled. falling back');
                return true;
            } else {
                Logger::debug('Negotiate - SP disable flag found but set to FALSE');
            }
        } else {
            Logger::debug('Negotiate - SP disable flag not found');
        }
        return false;
    }


    /**
     * checkMask() looks up the subnet config option and verifies
     * that the client is within that range.
     *
     * Will return TRUE if no subnet option is configured.
     *
     * @return bool
     */
    public function checkMask(): bool
    {
        // No subnet means all clients are accepted.
        if ($this->subnet === null) {
            return true;
        }
        $ip = $_SERVER['REMOTE_ADDR'];
        $netUtils = new Utils\Net()
        foreach ($this->subnet as $cidr) {

            $ret = $netUtils->ipCIDRcheck($cidr);
            if ($ret) {
                Logger::debug('Negotiate: Client "' . $ip . '" matched subnet.');
                return true;
            }
        }
        Logger::debug('Negotiate: Client "' . $ip . '" did not match subnet.');
        return false;
    }


    /**
     * Send the actual headers and body of the 401. Embedded in the body is a post that is triggered by JS if the client
     * wants to show the 401 message.
     *
     * @param array $params additional parameters to the URL in the URL in the body.
     */
    protected function sendNegotiate(array $params): void
    {
        $authPage = Module::getModuleURL('negotiateext/auth.php');
        $httpUtils = new Utils\HTTP();
        $httpUtils->redirectTrustedURL($authPage, $params);
    }


    /**
     * Passes control of the login process to a different module.
     *
     * @param array $state Information about the current authentication.
     *
     * @throws \SimpleSAML\Error\Error If couldn't determine the auth source.
     * @throws \SimpleSAML\Error\Exception
     * @throws \Exception
     */
    public static function fallBack(array &$state): void
    {
        $authId = $state['LogoutState']['negotiate:backend'];

        if ($authId === null) {
            throw new Error\Error([500, "Unable to determine auth source."]);
        }
        Logger::debug('Negotiate: fallBack to ' . $authId);
        $source = Auth\Source::getById($authId);

        if ($source === null) {
            throw new Exception('Could not find authentication source with id ' . $authId);
        }

        try {
            $source->authenticate($state);
        } catch (Error\Exception $e) {
            Auth\State::throwException($state, $e);
        } catch (Exception $e) {
            $e = new Error\UnserializableException($e);
            Auth\State::throwException($state, $e);
        }
        // fallBack never returns after loginCompleted()
        Logger::debug('Negotiate: backend returned');
        self::loginCompleted($state);
    }


    /**
     * @param array $state Information about the current authentication.
     */
    public function externalAuth(array &$state): void
    {
        Logger::debug('Negotiate - authenticate(): remote user found');
        $this->ldap = new Ldap(
            $this->hostname,
            $this->enableTLS,
            $this->debugLDAP,
            $this->timeout,
            $this->port,
            $this->referrals
        );

        $user = $_SERVER['REMOTE_USER'];
        Logger::info('Negotiate - authenticate(): ' . $user . ' authenticated.');
        $lookup = $this->lookupUserData($user);
        if ($lookup) {
            $state['Attributes'] = $lookup;
            // Override the backend so logout will know what to look for
            $state['LogoutState'] = [
                'negotiate:backend' => null,
            ];
            Logger::info('Negotiate - authenticate(): ' . $user . ' authorized.');
            Auth\Source::completeAuth($state);
            // Never reached.
            assert(false);
        }
    }


    /**
     * Passes control of the login process to a different module.
     *
     * @param string $state Information about the current authentication.
     *
     * @throws \SimpleSAML\Error\BadRequest If couldn't determine the auth source.
     * @throws \SimpleSAML\Error\NoState
     * @throws \SimpleSAML\Error\Exception
     */
    public static function external(): void
    {
        if (!isset($_REQUEST['AuthState'])) {
            throw new Error\BadRequest('Missing "AuthState" parameter.');
        }
        Logger::debug('Negotiate: external returned');
        $sid = Auth\State::parseStateID($_REQUEST['AuthState']);

        $state = Auth\State::loadState($_REQUEST['AuthState'], self::STAGEID, true);
        if ($state === null) {
            if ($sid['url'] === null) {
                throw new Error\NoState();
            }
            $httpUtils = new Utils\HTTP();
            $httpUtils->redirectUntrustedURL($sid['url'], ['negotiateext.auth' => 'false']);
            assert(false);
        }

        Assert::isArray($state);

        if (!empty($_SERVER['REMOTE_USER'])) {
            $source = Auth\Source::getById($state['negotiate:authId']);
            if ($source === null) {
                /*
                 * The only way this should fail is if we remove or rename the authentication source
                 * while the user is at the login page.
                 */
                throw new Error\Exception(
                    'Could not find authentication source with id ' . $state['negotiate:authId']
                );
            }
            /*
             * Make sure that we haven't switched the source type while the
             * user was at the authentication page. This can only happen if we
             * change config/authsources.php while an user is logging in.
             */
            if (!($source instanceof self)) {
                throw new Error\Exception('Authentication source type changed.');
            }
            Logger::debug('Negotiate - authenticate(): looking for Negotate');
            $source->externalAuth($state);
        }

        self::fallBack($state);
        assert(false);
    }


    /**
     * Strips away the realm of the Kerberos identifier, looks up what attributes to fetch from SP metadata and
     * searches the directory.
     *
     * @param string $user The Kerberos user identifier.
     *
     * @return array|null The attributes for the user or NULL if not found.
     */
    protected function lookupUserData(string $user): ?array
    {
        // Kerberos user names include realm. Strip that away.
        $pos = strpos($user, '@');
        if ($pos === false) {
            return null;
        }
        $uid = substr($user, 0, $pos);

        $this->adminBind();
        try {
            /** @psalm-var string $dn */
            $dn = $this->ldap->searchfordn($this->base, $this->attr, $uid);
            return $this->ldap->getAttributes($dn, $this->attributes, $this->binaryAttributes);
        } catch (Error\Exception $e) {
            Logger::debug('Negotiate - ldap lookup failed: ' . $e);
            return null;
        }
    }


    /**
     * Elevates the LDAP connection to allow restricted lookups if
     * so configured. Does nothing if not.
     *
     * @throws \SimpleSAML\Error\AuthSource
     */
    protected function adminBind(): void
    {
        if ($this->admin_user === null || $this->admin_pw === null) {
            // no admin user
            return;
        }
        Logger::debug('Negotiate - authenticate(): Binding as system user ' . var_export($this->admin_user, true));

        if (!$this->ldap->bind($this->admin_user, $this->admin_pw)) {
            $msg = 'Unable to authenticate system user (LDAP_INVALID_CREDENTIALS)';
            Logger::error('Negotiate - authenticate(): ' . $msg . ' ' . var_export($this->admin_user, true));
            throw new Error\AuthSource('negotiate', $msg);
        }
    }


    /**
     * Log out from this authentication source.
     *
     * This method either logs the user out from Negotiate or passes the
     * logout call to the fallback module.
     *
     * @param array &$state Information about the current logout operation.
     */
    public function logout(array &$state): void
    {
        // get the source that was used to authenticate
        $authId = $state['negotiate:backend'];
        Logger::debug('Negotiate - logout has the following authId: "' . $authId . '"');

        if ($authId === null) {
            $session = Session::getSessionFromRequest();
            $session->setData('negotiate:disable', 'session', true, 0);
            parent::logout($state);
        } else {
            $source = Auth\Source::getById($authId);
            if ($source === null) {
                throw new \Exception('Could not find authentication source with id ' . $authId);
            }

            $source->logout($state);
        }
    }
}


1			<?php
2
3			declare(strict_types=1);
4
5			namespace SimpleSAML\Module\negotiateext\Auth\Source;
6
7			use Exception;
8			use SimpleSAML\Assert\Assert;
9			use SimpleSAML\Auth;
10			use SimpleSAML\Error;
11			use SimpleSAML\Logger;
12			use SimpleSAML\Module;
13			use SimpleSAML\Module\ldap\Auth\Ldap;
14			use SimpleSAML\Session;
15			use SimpleSAML\Utils;
16
17			/**
18			* The Negotiate module. Allows for password-less, secure login by Kerberos and Negotiate.
19			*
20			* @package simplesamlphp/simplesamlphp-module-negotiate
21			*/
22
23			class Negotiate extends \SimpleSAML\Auth\Source
24			{
25			// Constants used in the module
26			public const STAGEID = '\SimpleSAML\Module\negotiateext\Auth\Source\Negotiate.StageId';
27
28			/** @var \SimpleSAML\Module\ldap\Auth\Ldap */
29			protected Ldap $ldap;
30
31			/** @var string */
32			protected string $backend = '';
33
34			/** @var string */
35			protected string $hostname = '';
36
37			/** @var int */
38			protected int $port = 389;
39
40			/** @var bool */
41			protected bool $referrals = true;
42
43			/** @var bool */
44			protected bool $enableTLS = false;
45
46			/** @var bool */
47			protected bool $debugLDAP = false;
48
49			/** @var int */
50			protected int $timeout = 30;
51
52			/** @var string */
53			protected string $keytab = '';
54
55			/** @var array */
56			protected array $base = [];
57
58			/** @var array */
59			protected array $attr = ['uid'];
60
61			/** @var array\|null */
62			protected ?array $subnet = null;
63
64			/** @var string\|null */
65			protected ?string $admin_user = null;
66
67			/** @var string\|null */
68			protected ?string $admin_pw = null;
69
70			/** @var array\|null */
71			protected ?array $attributes = null;
72
73			/** @var array */
74			protected array $binaryAttributes = [];
75
76
77			/**
78			* Constructor for this authentication source.
79			*
80			* @param array $info Information about this authentication source.
81			* @param array $config The configuration of the module
82			*/
83			public function __construct(array $info, array $config)
84			{
85			// call the parent constructor first, as required by the interface
86			parent::__construct($info, $config);
87
88			$cfg = \SimpleSAML\Configuration::loadFromArray($config);
89
90			$this->backend = $cfg->getString('fallback');
91			$this->hostname = $cfg->getString('hostname');
92			$this->port = $cfg->getInteger('port', 389);
93			$this->referrals = $cfg->getBoolean('referrals', true);
94			$this->enableTLS = $cfg->getBoolean('enable_tls', false);
95			$this->debugLDAP = $cfg->getBoolean('debugLDAP', false);
96			$this->timeout = $cfg->getInteger('timeout', 30);
97			$this->base = $cfg->getArrayizeString('base');
98			$this->attr = $cfg->getArrayizeString('attr', 'uid');
99			$this->subnet = $cfg->getArray('subnet', null);
100			$this->admin_user = $cfg->getString('adminUser', null);
101			$this->admin_pw = $cfg->getString('adminPassword', null);
102			$this->attributes = $cfg->getArray('attributes', null);
103			$this->binaryAttributes = $cfg->getArray('attributes.binary', []);
104			}
105
106
107			/**
108			* The inner workings of the module.
109			*
110			* Checks to see if client is in the defined subnets (if defined in config). Sends the client a 401 Negotiate and
111			* responds to the result. If the client fails to provide a proper Kerberos ticket, the login process is handed over
112			* to the 'fallback' module defined in the config.
113			*
114			* LDAP is used as a user metadata source.
115			*
116			* @param array &$state Information about the current authentication.
117			*/
118			public function authenticate(array &$state): void
119			{
120			// set the default backend to config
121			$state['LogoutState'] = [
122			'negotiate:backend' => $this->backend,
123			];
124			$state['negotiate:authId'] = $this->authId;
125
126
127			// check for disabled SPs. The disable flag is store in the SP metadata
128			if (array_key_exists('SPMetadata', $state) && $this->spDisabledInMetadata($state['SPMetadata'])) {
129			$this->fallBack($state);
130			}
131			/* Go straight to fallback if Negotiate is disabled or if you are sent back to the IdP directly from the SP
132			after having logged out. */
133			$session = \SimpleSAML\Session::getSessionFromRequest();
134			$disabled = $session->getData('negotiate:disable', 'session');
135
136			if (
137			$disabled \|\|
138			(!empty($_REQUEST['negotiateext_auth']) &&
139			$_REQUEST['negotiateext_auth'] == 'false') \|\|
140			(!empty($_COOKIE['NEGOTIATE_AUTOLOGIN_DISABLE_PERMANENT']) &&
141			$_COOKIE['NEGOTIATE_AUTOLOGIN_DISABLE_PERMANENT'] == 'True')
142			) {
143			Logger::debug('Negotiate - session disabled. falling back');
144			$this->fallBack($state);
145			// never executed
146			assert(false);
147			}
148			$mask = $this->checkMask();
149			if (!$mask) {
150			$this->fallBack($state);
151			// never executed
152			assert(false);
153			}
154
155			// No auth token. Send it.
156			Logger::debug('Negotiate - authenticate(): Sending Negotiate.');
157			// Save the $state array, so that we can restore if after a redirect
158			Logger::debug('Negotiate - fallback: ' . $state['LogoutState']['negotiate:backend']);
159			$id = \SimpleSAML\Auth\State::saveState($state, self::STAGEID);
160			$params = ['AuthState' => $id];
161
162			$this->sendNegotiate($params);
163			exit;
164			}
165
166
167			/**
168			* @param array $spMetadata
169			* @return bool
170			*/
171			public function spDisabledInMetadata(array $spMetadata): bool
172			{
173			if (array_key_exists('negotiate:disable', $spMetadata)) {
174			if ($spMetadata['negotiate:disable'] == true) {
175			Logger::debug('Negotiate - SP disabled. falling back');
176			return true;
177			} else {
178			Logger::debug('Negotiate - SP disable flag found but set to FALSE');
179			}
180			} else {
181			Logger::debug('Negotiate - SP disable flag not found');
182			}
183			return false;
184			}
185
186
187			/**
188			* checkMask() looks up the subnet config option and verifies
189			* that the client is within that range.
190			*
191			* Will return TRUE if no subnet option is configured.
192			*
193			* @return bool
194			*/
195			public function checkMask(): bool
196			{
197			// No subnet means all clients are accepted.
198			if ($this->subnet === null) {
199			return true;
200			}
201			$ip = $_SERVER['REMOTE_ADDR'];
202			$netUtils = new Utils\Net()
203			foreach ($this->subnet as $cidr) {
			0 ignored issues – show Bug introduced 2022-01-09 00:28 UTC by Report Bug Copy Issue Report A parse error occurred: Syntax error, unexpected T_FOREACH on line 203 at column 8 Loading history...
204			$ret = $netUtils->ipCIDRcheck($cidr);
205			if ($ret) {
206			Logger::debug('Negotiate: Client "' . $ip . '" matched subnet.');
207			return true;
208			}
209			}
210			Logger::debug('Negotiate: Client "' . $ip . '" did not match subnet.');
211			return false;
212			}
213
214
215			/**
216			* Send the actual headers and body of the 401. Embedded in the body is a post that is triggered by JS if the client
217			* wants to show the 401 message.
218			*
219			* @param array $params additional parameters to the URL in the URL in the body.
220			*/
221			protected function sendNegotiate(array $params): void
222			{
223			$authPage = Module::getModuleURL('negotiateext/auth.php');
224			$httpUtils = new Utils\HTTP();
225			$httpUtils->redirectTrustedURL($authPage, $params);
226			}
227
228
229			/**
230			* Passes control of the login process to a different module.
231			*
232			* @param array $state Information about the current authentication.
233			*
234			* @throws \SimpleSAML\Error\Error If couldn't determine the auth source.
235			* @throws \SimpleSAML\Error\Exception
236			* @throws \Exception
237			*/
238			public static function fallBack(array &$state): void
239			{
240			$authId = $state['LogoutState']['negotiate:backend'];
241
242			if ($authId === null) {
243			throw new Error\Error([500, "Unable to determine auth source."]);
244			}
245			Logger::debug('Negotiate: fallBack to ' . $authId);
246			$source = Auth\Source::getById($authId);
247
248			if ($source === null) {
249			throw new Exception('Could not find authentication source with id ' . $authId);
250			}
251
252			try {
253			$source->authenticate($state);
254			} catch (Error\Exception $e) {
255			Auth\State::throwException($state, $e);
256			} catch (Exception $e) {
257			$e = new Error\UnserializableException($e);
258			Auth\State::throwException($state, $e);
259			}
260			// fallBack never returns after loginCompleted()
261			Logger::debug('Negotiate: backend returned');
262			self::loginCompleted($state);
263			}
264
265
266			/**
267			* @param array $state Information about the current authentication.
268			*/
269			public function externalAuth(array &$state): void
270			{
271			Logger::debug('Negotiate - authenticate(): remote user found');
272			$this->ldap = new Ldap(
273			$this->hostname,
274			$this->enableTLS,
275			$this->debugLDAP,
276			$this->timeout,
277			$this->port,
278			$this->referrals
279			);
280
281			$user = $_SERVER['REMOTE_USER'];
282			Logger::info('Negotiate - authenticate(): ' . $user . ' authenticated.');
283			$lookup = $this->lookupUserData($user);
284			if ($lookup) {
285			$state['Attributes'] = $lookup;
286			// Override the backend so logout will know what to look for
287			$state['LogoutState'] = [
288			'negotiate:backend' => null,
289			];
290			Logger::info('Negotiate - authenticate(): ' . $user . ' authorized.');
291			Auth\Source::completeAuth($state);
292			// Never reached.
293			assert(false);
294			}
295			}
296
297
298			/**
299			* Passes control of the login process to a different module.
300			*
301			* @param string $state Information about the current authentication.
302			*
303			* @throws \SimpleSAML\Error\BadRequest If couldn't determine the auth source.
304			* @throws \SimpleSAML\Error\NoState
305			* @throws \SimpleSAML\Error\Exception
306			*/
307			public static function external(): void
308			{
309			if (!isset($_REQUEST['AuthState'])) {
310			throw new Error\BadRequest('Missing "AuthState" parameter.');
311			}
312			Logger::debug('Negotiate: external returned');
313			$sid = Auth\State::parseStateID($_REQUEST['AuthState']);
314
315			$state = Auth\State::loadState($_REQUEST['AuthState'], self::STAGEID, true);
316			if ($state === null) {
317			if ($sid['url'] === null) {
318			throw new Error\NoState();
319			}
320			$httpUtils = new Utils\HTTP();
321			$httpUtils->redirectUntrustedURL($sid['url'], ['negotiateext.auth' => 'false']);
322			assert(false);
323			}
324
325			Assert::isArray($state);
326
327			if (!empty($_SERVER['REMOTE_USER'])) {
328			$source = Auth\Source::getById($state['negotiate:authId']);
329			if ($source === null) {
330			/*
331			* The only way this should fail is if we remove or rename the authentication source
332			* while the user is at the login page.
333			*/
334			throw new Error\Exception(
335			'Could not find authentication source with id ' . $state['negotiate:authId']
336			);
337			}
338			/*
339			* Make sure that we haven't switched the source type while the
340			* user was at the authentication page. This can only happen if we
341			* change config/authsources.php while an user is logging in.
342			*/
343			if (!($source instanceof self)) {
344			throw new Error\Exception('Authentication source type changed.');
345			}
346			Logger::debug('Negotiate - authenticate(): looking for Negotate');
347			$source->externalAuth($state);
348			}
349
350			self::fallBack($state);
351			assert(false);
352			}
353
354
355			/**
356			* Strips away the realm of the Kerberos identifier, looks up what attributes to fetch from SP metadata and
357			* searches the directory.
358			*
359			* @param string $user The Kerberos user identifier.
360			*
361			* @return array\|null The attributes for the user or NULL if not found.
362			*/
363			protected function lookupUserData(string $user): ?array
364			{
365			// Kerberos user names include realm. Strip that away.
366			$pos = strpos($user, '@');
367			if ($pos === false) {
368			return null;
369			}
370			$uid = substr($user, 0, $pos);
371
372			$this->adminBind();
373			try {
374			/** @psalm-var string $dn */
375			$dn = $this->ldap->searchfordn($this->base, $this->attr, $uid);
376			return $this->ldap->getAttributes($dn, $this->attributes, $this->binaryAttributes);
377			} catch (Error\Exception $e) {
378			Logger::debug('Negotiate - ldap lookup failed: ' . $e);
379			return null;
380			}
381			}
382
383
384			/**
385			* Elevates the LDAP connection to allow restricted lookups if
386			* so configured. Does nothing if not.
387			*
388			* @throws \SimpleSAML\Error\AuthSource
389			*/
390			protected function adminBind(): void
391			{
392			if ($this->admin_user === null \|\| $this->admin_pw === null) {
393			// no admin user
394			return;
395			}
396			Logger::debug('Negotiate - authenticate(): Binding as system user ' . var_export($this->admin_user, true));
397
398			if (!$this->ldap->bind($this->admin_user, $this->admin_pw)) {
399			$msg = 'Unable to authenticate system user (LDAP_INVALID_CREDENTIALS)';
400			Logger::error('Negotiate - authenticate(): ' . $msg . ' ' . var_export($this->admin_user, true));
401			throw new Error\AuthSource('negotiate', $msg);
402			}
403			}
404
405
406			/**
407			* Log out from this authentication source.
408			*
409			* This method either logs the user out from Negotiate or passes the
410			* logout call to the fallback module.
411			*
412			* @param array &$state Information about the current logout operation.
413			*/
414			public function logout(array &$state): void
415			{
416			// get the source that was used to authenticate
417			$authId = $state['negotiate:backend'];
418			Logger::debug('Negotiate - logout has the following authId: "' . $authId . '"');
419
420			if ($authId === null) {
421			$session = Session::getSessionFromRequest();
422			$session->setData('negotiate:disable', 'session', true, 0);
423			parent::logout($state);
424			} else {
425			$source = Auth\Source::getById($authId);
426			if ($source === null) {
427			throw new \Exception('Could not find authentication source with id ' . $authId);
428			}
429
430			$source->logout($state);
431			}
432			}
433			}
434

simplesamlphp / simplesamlphp-module-negotiateext

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