370 lines
12 KiB
PHP
370 lines
12 KiB
PHP
<?php namespace BookStack\Services;
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use BookStack\Exceptions\LdapException;
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use BookStack\Repos\UserRepo;
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use BookStack\Role;
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use BookStack\User;
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use Illuminate\Contracts\Auth\Authenticatable;
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use Illuminate\Database\Eloquent\Builder;
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/**
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* Class LdapService
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* Handles any app-specific LDAP tasks.
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* @package BookStack\Services
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*/
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class LdapService
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{
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protected $ldap;
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protected $ldapConnection;
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protected $config;
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protected $userRepo;
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protected $enabled;
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/**
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* LdapService constructor.
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* @param Ldap $ldap
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* @param UserRepo $userRepo
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*/
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public function __construct(Ldap $ldap, UserRepo $userRepo)
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{
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$this->ldap = $ldap;
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$this->config = config('services.ldap');
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$this->userRepo = $userRepo;
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$this->enabled = config('auth.method') === 'ldap';
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}
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/**
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* Check if groups should be synced.
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* @return bool
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*/
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public function shouldSyncGroups()
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{
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return $this->enabled && $this->config['user_to_groups'] !== false;
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}
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/**
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* Search for attributes for a specific user on the ldap
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* @param string $userName
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* @param array $attributes
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* @return null|array
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* @throws LdapException
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*/
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private function getUserWithAttributes($userName, $attributes)
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{
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$ldapConnection = $this->getConnection();
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$this->bindSystemUser($ldapConnection);
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// Find user
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$userFilter = $this->buildFilter($this->config['user_filter'], ['user' => $userName]);
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$baseDn = $this->config['base_dn'];
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$followReferrals = $this->config['follow_referrals'] ? 1 : 0;
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$this->ldap->setOption($ldapConnection, LDAP_OPT_REFERRALS, $followReferrals);
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$users = $this->ldap->searchAndGetEntries($ldapConnection, $baseDn, $userFilter, $attributes);
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if ($users['count'] === 0) {
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return null;
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}
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return $users[0];
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}
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/**
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* Get the details of a user from LDAP using the given username.
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* User found via configurable user filter.
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* @param $userName
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* @return array|null
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* @throws LdapException
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*/
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public function getUserDetails($userName)
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{
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$emailAttr = $this->config['email_attribute'];
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$user = $this->getUserWithAttributes($userName, ['cn', 'uid', 'dn', $emailAttr]);
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if ($user === null) {
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return null;
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}
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return [
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'uid' => (isset($user['uid'])) ? $user['uid'][0] : $user['dn'],
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'name' => $user['cn'][0],
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'dn' => $user['dn'],
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'email' => (isset($user[$emailAttr])) ? (is_array($user[$emailAttr]) ? $user[$emailAttr][0] : $user[$emailAttr]) : null
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];
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}
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/**
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* @param Authenticatable $user
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* @param string $username
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* @param string $password
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* @return bool
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* @throws LdapException
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*/
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public function validateUserCredentials(Authenticatable $user, $username, $password)
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{
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$ldapUser = $this->getUserDetails($username);
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if ($ldapUser === null) {
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return false;
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}
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if ($ldapUser['uid'] !== $user->external_auth_id) {
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return false;
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}
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$ldapConnection = $this->getConnection();
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try {
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$ldapBind = $this->ldap->bind($ldapConnection, $ldapUser['dn'], $password);
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} catch (\ErrorException $e) {
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$ldapBind = false;
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}
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return $ldapBind;
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}
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/**
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* Bind the system user to the LDAP connection using the given credentials
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* otherwise anonymous access is attempted.
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* @param $connection
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* @throws LdapException
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*/
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protected function bindSystemUser($connection)
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{
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$ldapDn = $this->config['dn'];
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$ldapPass = $this->config['pass'];
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$isAnonymous = ($ldapDn === false || $ldapPass === false);
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if ($isAnonymous) {
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$ldapBind = $this->ldap->bind($connection);
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} else {
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$ldapBind = $this->ldap->bind($connection, $ldapDn, $ldapPass);
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}
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if (!$ldapBind) {
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throw new LdapException(($isAnonymous ? trans('errors.ldap_fail_anonymous') : trans('errors.ldap_fail_authed')));
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}
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}
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/**
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* Get the connection to the LDAP server.
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* Creates a new connection if one does not exist.
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* @return resource
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* @throws LdapException
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*/
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protected function getConnection()
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{
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if ($this->ldapConnection !== null) {
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return $this->ldapConnection;
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}
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// Check LDAP extension in installed
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if (!function_exists('ldap_connect') && config('app.env') !== 'testing') {
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throw new LdapException(trans('errors.ldap_extension_not_installed'));
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}
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// Get port from server string and protocol if specified.
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$ldapServer = explode(':', $this->config['server']);
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$hasProtocol = preg_match('/^ldaps{0,1}\:\/\//', $this->config['server']) === 1;
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if (!$hasProtocol) {
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array_unshift($ldapServer, '');
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}
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$hostName = $ldapServer[0] . ($hasProtocol?':':'') . $ldapServer[1];
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$defaultPort = $ldapServer[0] === 'ldaps' ? 636 : 389;
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$ldapConnection = $this->ldap->connect($hostName, count($ldapServer) > 2 ? intval($ldapServer[2]) : $defaultPort);
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if ($ldapConnection === false) {
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throw new LdapException(trans('errors.ldap_cannot_connect'));
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}
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// Set any required options
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if ($this->config['version']) {
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$this->ldap->setVersion($ldapConnection, $this->config['version']);
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}
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$this->ldapConnection = $ldapConnection;
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return $this->ldapConnection;
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}
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/**
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* Build a filter string by injecting common variables.
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* @param string $filterString
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* @param array $attrs
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* @return string
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*/
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protected function buildFilter($filterString, array $attrs)
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{
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$newAttrs = [];
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foreach ($attrs as $key => $attrText) {
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$newKey = '${' . $key . '}';
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$newAttrs[$newKey] = $attrText;
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}
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return strtr($filterString, $newAttrs);
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}
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/**
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* Get the groups a user is a part of on ldap
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* @param string $userName
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* @return array
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* @throws LdapException
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*/
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public function getUserGroups($userName)
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{
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$groupsAttr = $this->config['group_attribute'];
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$user = $this->getUserWithAttributes($userName, [$groupsAttr]);
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if ($user === null) {
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return [];
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}
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$userGroups = $this->groupFilter($user);
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$userGroups = $this->getGroupsRecursive($userGroups, []);
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return $userGroups;
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}
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/**
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* Get the parent groups of an array of groups
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* @param array $groupsArray
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* @param array $checked
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* @return array
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* @throws LdapException
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*/
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private function getGroupsRecursive($groupsArray, $checked)
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{
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$groups_to_add = [];
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foreach ($groupsArray as $groupName) {
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if (in_array($groupName, $checked)) {
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continue;
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}
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$groupsToAdd = $this->getGroupGroups($groupName);
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$groups_to_add = array_merge($groups_to_add, $groupsToAdd);
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$checked[] = $groupName;
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}
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$groupsArray = array_unique(array_merge($groupsArray, $groups_to_add), SORT_REGULAR);
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if (!empty($groups_to_add)) {
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return $this->getGroupsRecursive($groupsArray, $checked);
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} else {
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return $groupsArray;
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}
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}
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/**
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* Get the parent groups of a single group
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* @param string $groupName
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* @return array
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* @throws LdapException
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*/
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private function getGroupGroups($groupName)
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{
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$ldapConnection = $this->getConnection();
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$this->bindSystemUser($ldapConnection);
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$followReferrals = $this->config['follow_referrals'] ? 1 : 0;
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$this->ldap->setOption($ldapConnection, LDAP_OPT_REFERRALS, $followReferrals);
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$baseDn = $this->config['base_dn'];
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$groupsAttr = strtolower($this->config['group_attribute']);
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$groups = $this->ldap->searchAndGetEntries($ldapConnection, $baseDn, 'CN='.$groupName, [$groupsAttr]);
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if ($groups['count'] === 0) {
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return [];
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}
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$groupGroups = $this->groupFilter($groups[0]);
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return $groupGroups;
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}
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/**
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* Filter out LDAP CN and DN language in a ldap search return
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* Gets the base CN (common name) of the string
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* @param string $ldapSearchReturn
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* @return array
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*/
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protected function groupFilter($ldapSearchReturn)
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{
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$groupsAttr = strtolower($this->config['group_attribute']);
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$ldapGroups = [];
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$count = 0;
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if (isset($ldapSearchReturn[$groupsAttr]['count'])) {
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$count = (int) $ldapSearchReturn[$groupsAttr]['count'];
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}
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for ($i=0; $i<$count; $i++) {
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$dnComponents = ldap_explode_dn($ldapSearchReturn[$groupsAttr][$i], 1);
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if (!in_array($dnComponents[0], $ldapGroups)) {
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$ldapGroups[] = $dnComponents[0];
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}
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}
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return $ldapGroups;
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}
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/**
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* Sync the LDAP groups to the user roles for the current user
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* @param \BookStack\User $user
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* @param string $username
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* @throws LdapException
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*/
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public function syncGroups(User $user, string $username)
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{
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$userLdapGroups = $this->getUserGroups($username);
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// Get the ids for the roles from the names
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$ldapGroupsAsRoles = $this->matchLdapGroupsToSystemsRoles($userLdapGroups);
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// Sync groups
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if ($this->config['remove_from_groups']) {
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$user->roles()->sync($ldapGroupsAsRoles);
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$this->userRepo->attachDefaultRole($user);
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} else {
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$user->roles()->syncWithoutDetaching($ldapGroupsAsRoles);
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}
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}
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/**
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* Match an array of group names from LDAP to BookStack system roles.
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* Formats LDAP group names to be lower-case and hyphenated.
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* @param array $groupNames
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* @return \Illuminate\Support\Collection
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*/
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protected function matchLdapGroupsToSystemsRoles(array $groupNames)
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{
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foreach ($groupNames as $i => $groupName) {
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$groupNames[$i] = str_replace(' ', '-', trim(strtolower($groupName)));
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}
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$roles = Role::query()->where(function (Builder $query) use ($groupNames) {
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$query->whereIn('name', $groupNames);
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foreach ($groupNames as $groupName) {
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$query->orWhere('external_auth_id', 'LIKE', '%' . $groupName . '%');
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}
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})->get();
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$matchedRoles = $roles->filter(function (Role $role) use ($groupNames) {
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return $this->roleMatchesGroupNames($role, $groupNames);
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});
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return $matchedRoles->pluck('id');
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}
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/**
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* Check a role against an array of group names to see if it matches.
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* Checked against role 'external_auth_id' if set otherwise the name of the role.
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* @param Role $role
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* @param array $groupNames
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* @return bool
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*/
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protected function roleMatchesGroupNames(Role $role, array $groupNames)
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{
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if ($role->external_auth_id) {
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$externalAuthIds = explode(',', strtolower($role->external_auth_id));
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foreach ($externalAuthIds as $externalAuthId) {
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if (in_array(trim($externalAuthId), $groupNames)) {
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return true;
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}
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}
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return false;
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}
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$roleName = str_replace(' ', '-', trim(strtolower($role->display_name)));
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return in_array($roleName, $groupNames);
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}
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}
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