mirror of
https://github.com/BookStackApp/BookStack.git
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392eef8273
Error handling updated after testing, since the ldap 'starttls' operation can throw an error, or maybe return false. The PHP docs are quite under-documented in regards to this function.
456 lines
14 KiB
PHP
456 lines
14 KiB
PHP
<?php
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namespace BookStack\Auth\Access;
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use BookStack\Auth\User;
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use BookStack\Exceptions\JsonDebugException;
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use BookStack\Exceptions\LdapException;
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use BookStack\Uploads\UserAvatars;
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use ErrorException;
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use Illuminate\Support\Facades\Log;
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/**
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* Class LdapService
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* Handles any app-specific LDAP tasks.
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*/
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class LdapService
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{
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protected Ldap $ldap;
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protected GroupSyncService $groupSyncService;
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protected UserAvatars $userAvatars;
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/**
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* @var resource
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*/
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protected $ldapConnection;
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protected array $config;
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protected bool $enabled;
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/**
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* LdapService constructor.
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*/
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public function __construct(Ldap $ldap, UserAvatars $userAvatars, GroupSyncService $groupSyncService)
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{
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$this->ldap = $ldap;
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$this->userAvatars = $userAvatars;
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$this->groupSyncService = $groupSyncService;
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$this->config = config('services.ldap');
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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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*/
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public function shouldSyncGroups(): bool
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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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*
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* @throws LdapException
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*/
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private function getUserWithAttributes(string $userName, array $attributes): ?array
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{
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$ldapConnection = $this->getConnection();
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$this->bindSystemUser($ldapConnection);
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// Clean attributes
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foreach ($attributes as $index => $attribute) {
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if (strpos($attribute, 'BIN;') === 0) {
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$attributes[$index] = substr($attribute, strlen('BIN;'));
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}
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}
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// Find user
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$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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*
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* @throws LdapException
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*/
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public function getUserDetails(string $userName): ?array
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{
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$idAttr = $this->config['id_attribute'];
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$emailAttr = $this->config['email_attribute'];
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$displayNameAttr = $this->config['display_name_attribute'];
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$thumbnailAttr = $this->config['thumbnail_attribute'];
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$user = $this->getUserWithAttributes($userName, array_filter([
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'cn', 'dn', $idAttr, $emailAttr, $displayNameAttr, $thumbnailAttr,
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]));
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if (is_null($user)) {
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return null;
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}
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$userCn = $this->getUserResponseProperty($user, 'cn', null);
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$formatted = [
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'uid' => $this->getUserResponseProperty($user, $idAttr, $user['dn']),
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'name' => $this->getUserResponseProperty($user, $displayNameAttr, $userCn),
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'dn' => $user['dn'],
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'email' => $this->getUserResponseProperty($user, $emailAttr, null),
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'avatar' => $thumbnailAttr ? $this->getUserResponseProperty($user, $thumbnailAttr, null) : null,
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];
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if ($this->config['dump_user_details']) {
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throw new JsonDebugException([
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'details_from_ldap' => $user,
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'details_bookstack_parsed' => $formatted,
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]);
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}
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return $formatted;
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}
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/**
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* Get a property from an LDAP user response fetch.
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* Handles properties potentially being part of an array.
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* If the given key is prefixed with 'BIN;', that indicator will be stripped
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* from the key and any fetched values will be converted from binary to hex.
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*/
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protected function getUserResponseProperty(array $userDetails, string $propertyKey, $defaultValue)
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{
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$isBinary = strpos($propertyKey, 'BIN;') === 0;
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$propertyKey = strtolower($propertyKey);
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$value = $defaultValue;
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if ($isBinary) {
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$propertyKey = substr($propertyKey, strlen('BIN;'));
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}
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if (isset($userDetails[$propertyKey])) {
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$value = (is_array($userDetails[$propertyKey]) ? $userDetails[$propertyKey][0] : $userDetails[$propertyKey]);
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if ($isBinary) {
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$value = bin2hex($value);
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}
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}
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return $value;
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}
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/**
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* Check if the given credentials are valid for the given user.
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*
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* @throws LdapException
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*/
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public function validateUserCredentials(?array $ldapUserDetails, string $password): bool
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{
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if (is_null($ldapUserDetails)) {
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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, $ldapUserDetails['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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*
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* @param resource $connection
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*
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* @throws LdapException
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*/
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protected function bindSystemUser($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(($isAnonymous ? trans('errors.ldap_fail_anonymous') : trans('errors.ldap_fail_authed')));
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}
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}
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/**
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* Get the connection to the LDAP server.
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* Creates a new connection if one does not exist.
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*
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* @throws LdapException
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*
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* @return resource
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*/
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protected function getConnection()
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{
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if ($this->ldapConnection !== null) {
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return $this->ldapConnection;
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}
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// Check LDAP extension in installed
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if (!function_exists('ldap_connect') && config('app.env') !== 'testing') {
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throw new LdapException(trans('errors.ldap_extension_not_installed'));
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}
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// Disable certificate verification.
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// This option works globally and must be set before a connection is created.
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if ($this->config['tls_insecure']) {
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$this->ldap->setOption(null, LDAP_OPT_X_TLS_REQUIRE_CERT, LDAP_OPT_X_TLS_NEVER);
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}
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$serverDetails = $this->parseEnvironmentServer($this->config['server']);
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$this->ldapConnection = $this->prepareServerConnection($serverDetails);
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return $this->ldapConnection;
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}
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/**
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* Processes an array of received servers and returns the first working connection.
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*
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* @param array $serverDetails
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* @return resource
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* @throws LdapException
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*/
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protected function prepareServerConnection(array $serverDetails)
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{
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$lastException = null;
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foreach ($serverDetails as $server) {
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try {
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$ldapConnection = $this->ldap->connect($server['host'], $server['port']);
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if (!$ldapConnection) {
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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, $this->config['version']);
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}
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// Start and verify TLS if it's enabled
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if ($this->config['start_tls']) {
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try {
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$tlsStarted = $this->ldap->startTls($ldapConnection);
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} catch (ErrorException $exception) {
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$tlsStarted = false;
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}
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if (!$tlsStarted) {
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throw new LdapException('Could not start TLS connection');
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}
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}
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return $ldapConnection;
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} catch (LdapException $exception) {
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$lastException = $exception;
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}
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}
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throw $lastException;
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}
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/**
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* Parse environment variable with LDAP server and returns an array of recognized servers.
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* If you need to use multiple addresses, separate them with a semicolon.
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* Ex: 'ldap.example.com:8069;ldaps://ldap.example.com'
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*/
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protected function parseEnvironmentServer(string $environmentServer): array
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{
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$explodedEnvironmentServer = explode(';', $environmentServer);
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$result_servers = [];
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foreach ($explodedEnvironmentServer as $serverString) {
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$result_servers[] = $this->parseServerString($serverString);
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}
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return $result_servers;
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}
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/**
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* Parse a LDAP server string and return the host and port for a connection.
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* Is flexible to formats such as 'ldap.example.com:8069' or 'ldaps://ldap.example.com'.
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*/
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protected function parseServerString(string $serverString): array
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{
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$serverNameParts = explode(':', $serverString);
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// If we have a protocol just return the full string since PHP will ignore a separate port.
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if ($serverNameParts[0] === 'ldaps' || $serverNameParts[0] === 'ldap') {
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return ['host' => $serverString, 'port' => 389];
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}
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// Otherwise, extract the port out
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$hostName = $serverNameParts[0];
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$ldapPort = (count($serverNameParts) > 1) ? intval($serverNameParts[1]) : 389;
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return ['host' => $hostName, 'port' => $ldapPort];
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}
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/**
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* Build a filter string by injecting common variables.
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*/
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protected function buildFilter(string $filterString, array $attrs): string
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{
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$newAttrs = [];
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foreach ($attrs as $key => $attrText) {
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$newKey = '${' . $key . '}';
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$newAttrs[$newKey] = $this->ldap->escape($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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*
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* @throws LdapException
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* @throws JsonDebugException
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*/
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public function getUserGroups(string $userName): array
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{
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$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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$allGroups = $this->getGroupsRecursive($userGroups, []);
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if ($this->config['dump_user_groups']) {
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throw new JsonDebugException([
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'details_from_ldap' => $user,
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'parsed_direct_user_groups' => $userGroups,
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'parsed_recursive_user_groups' => $allGroups,
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]);
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}
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return $allGroups;
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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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*
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* @throws LdapException
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*/
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private function getGroupsRecursive(array $groupsArray, array $checked): array
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{
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$groupsToAdd = [];
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foreach ($groupsArray as $groupName) {
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if (in_array($groupName, $checked)) {
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continue;
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}
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$parentGroups = $this->getGroupGroups($groupName);
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$groupsToAdd = array_merge($groupsToAdd, $parentGroups);
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$checked[] = $groupName;
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}
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$groupsArray = array_unique(array_merge($groupsArray, $groupsToAdd), SORT_REGULAR);
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if (empty($groupsToAdd)) {
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return $groupsArray;
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}
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return $this->getGroupsRecursive($groupsArray, $checked);
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}
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/**
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* Get the parent groups of a single group.
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*
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* @throws LdapException
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*/
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private function getGroupGroups(string $groupName): array
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{
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$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($this->config['group_attribute']);
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$groupFilter = 'CN=' . $this->ldap->escape($groupName);
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$groups = $this->ldap->searchAndGetEntries($ldapConnection, $baseDn, $groupFilter, [$groupsAttr]);
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if ($groups['count'] === 0) {
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return [];
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}
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return $this->groupFilter($groups[0]);
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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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*/
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protected function groupFilter(array $userGroupSearchResponse): array
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{
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$groupsAttr = strtolower($this->config['group_attribute']);
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$ldapGroups = [];
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$count = 0;
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if (isset($userGroupSearchResponse[$groupsAttr]['count'])) {
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$count = (int) $userGroupSearchResponse[$groupsAttr]['count'];
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}
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for ($i = 0; $i < $count; $i++) {
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$dnComponents = $this->ldap->explodeDn($userGroupSearchResponse[$groupsAttr][$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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*
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* @throws LdapException
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* @throws JsonDebugException
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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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$this->groupSyncService->syncUserWithFoundGroups($user, $userLdapGroups, $this->config['remove_from_groups']);
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}
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/**
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* Save and attach an avatar image, if found in the ldap details, and attach
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* to the given user model.
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*/
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public function saveAndAttachAvatar(User $user, array $ldapUserDetails): void
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{
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if (is_null(config('services.ldap.thumbnail_attribute')) || is_null($ldapUserDetails['avatar'])) {
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return;
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}
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try {
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$imageData = $ldapUserDetails['avatar'];
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$this->userAvatars->assignToUserFromExistingData($user, $imageData, 'jpg');
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} catch (\Exception $exception) {
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Log::info("Failed to use avatar image from LDAP data for user id {$user->id}");
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}
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}
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}
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