475 lines
16 KiB
PHP
475 lines
16 KiB
PHP
<?php
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namespace BookStack\Access;
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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 BookStack\Users\Models\User;
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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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/**
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* @var resource|\LDAP\Connection
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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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public function __construct(
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protected Ldap $ldap,
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protected UserAvatars $userAvatars,
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protected GroupSyncService $groupSyncService
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) {
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$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 => $attribute) {
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if (str_starts_with($attribute, 'BIN;')) {
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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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* Build the user display name from the (potentially multiple) attributes defined by the configuration.
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*/
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protected function getUserDisplayName(array $userDetails, array $displayNameAttrs, string $defaultValue): string
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{
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$displayNameParts = [];
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foreach ($displayNameAttrs as $dnAttr) {
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$dnComponent = $this->getUserResponseProperty($userDetails, $dnAttr, null);
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if ($dnComponent) {
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$displayNameParts[] = $dnComponent;
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}
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}
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if (empty($displayNameParts)) {
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return $defaultValue;
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}
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return implode(' ', $displayNameParts);
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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|JsonDebugException
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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 = $this->config['email_attribute'];
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$displayNameAttrs = explode('|', $this->config['display_name_attribute']);
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$thumbnailAttr = $this->config['thumbnail_attribute'];
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$user = $this->getUserWithAttributes($userName, array_filter([
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'cn', 'dn', $idAttr, $emailAttr, ...$displayNameAttrs, $thumbnailAttr,
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]));
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if (is_null($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' => $this->getUserDisplayName($user, $displayNameAttrs, $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 = str_starts_with($propertyKey, 'BIN;');
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$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|\LDAP\Connection $connection
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*
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* @throws LdapException
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*/
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protected function bindSystemUser($connection): void
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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(($isAnonymous ? trans('errors.ldap_fail_anonymous') : trans('errors.ldap_fail_authed')));
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}
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}
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/**
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* Get the connection to the LDAP server.
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* Creates a new connection if one does not exist.
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*
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* @throws LdapException
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*
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* @return resource|\LDAP\Connection
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*/
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protected function getConnection()
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{
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if ($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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$this->ldap->setOption(null, LDAP_OPT_X_TLS_REQUIRE_CERT, LDAP_OPT_X_TLS_NEVER);
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}
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// Configure any user-provided CA cert files for LDAP.
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// This option works globally and must be set before a connection is created.
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if ($this->config['tls_ca_cert']) {
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$this->configureTlsCaCerts($this->config['tls_ca_cert']);
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}
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$ldapHost = $this->parseServerString($this->config['server']);
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$ldapConnection = $this->ldap->connect($ldapHost);
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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, $this->config['version']);
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}
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// Start and verify TLS if it's enabled
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if ($this->config['start_tls']) {
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try {
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$started = $this->ldap->startTls($ldapConnection);
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} catch (\Exception $exception) {
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$error = $exception->getMessage() . ' :: ' . ldap_error($ldapConnection);
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ldap_get_option($ldapConnection, LDAP_OPT_DIAGNOSTIC_MESSAGE, $detail);
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Log::info("LDAP STARTTLS failure: {$error} {$detail}");
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throw new LdapException('Could not start TLS connection. Further details in the application log.');
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}
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if (!$started) {
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throw new LdapException('Could not start TLS connection');
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}
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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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* Configure TLS CA certs globally for ldap use.
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* This will detect if the given path is a directory or file, and set the relevant
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* LDAP TLS options appropriately otherwise throw an exception if no file/folder found.
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*
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* Note: When using a folder, certificates are expected to be correctly named by hash
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* which can be done via the c_rehash utility.
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*
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* @throws LdapException
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*/
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protected function configureTlsCaCerts(string $caCertPath): void
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{
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$errMessage = "Provided path [{$caCertPath}] for LDAP TLS CA certs could not be resolved to an existing location";
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$path = realpath($caCertPath);
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if ($path === false) {
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throw new LdapException($errMessage);
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}
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if (is_dir($path)) {
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$this->ldap->setOption(null, LDAP_OPT_X_TLS_CACERTDIR, $path);
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} else if (is_file($path)) {
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$this->ldap->setOption(null, LDAP_OPT_X_TLS_CACERTFILE, $path);
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} else {
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throw new LdapException($errMessage);
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}
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}
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/**
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* Parse an LDAP server string and return the host suitable 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 $serverString): string
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{
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if (str_starts_with($serverString, 'ldaps://') || str_starts_with($serverString, 'ldap://')) {
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return $serverString;
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}
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return "ldap://{$serverString}";
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}
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/**
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* Build a filter string by injecting common variables.
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* Both "${var}" and "{var}" style placeholders are supported.
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* Dollar based are old format but supported for compatibility.
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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 => $attrText) {
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$escapedText = $this->ldap->escape($attrText);
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$oldVarKey = '${' . $key . '}';
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$newVarKey = '{' . $key . '}';
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$newAttrs[$oldVarKey] = $escapedText;
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$newAttrs[$newVarKey] = $escapedText;
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}
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return strtr($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 = $this->extractGroupsFromSearchResponseEntry($user);
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$allGroups = $this->getGroupsRecursive($userGroups, []);
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$formattedGroups = $this->extractGroupNamesFromLdapGroupDns($allGroups);
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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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'parsed_resulting_group_names' => $formattedGroups,
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]);
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}
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return $formattedGroups;
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}
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protected function extractGroupNamesFromLdapGroupDns(array $groupDNs): array
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{
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$names = [];
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foreach ($groupDNs as $groupDN) {
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$exploded = $this->ldap->explodeDn($groupDN, 1);
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if ($exploded !== false && count($exploded) > 0) {
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$names[] = $exploded[0];
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}
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}
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return array_unique($names);
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}
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/**
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* Build an array of all relevant groups DNs after recursively scanning
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* across parents of the groups given.
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*
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* @throws LdapException
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*/
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protected function getGroupsRecursive(array $groupDNs, array $checked): array
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{
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$groupsToAdd = [];
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foreach ($groupDNs as $groupDN) {
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if (in_array($groupDN, $checked)) {
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continue;
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}
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$parentGroups = $this->getParentsOfGroup($groupDN);
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$groupsToAdd = array_merge($groupsToAdd, $parentGroups);
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$checked[] = $groupDN;
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}
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$uniqueDNs = array_unique(array_merge($groupDNs, $groupsToAdd), SORT_REGULAR);
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if (empty($groupsToAdd)) {
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return $uniqueDNs;
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}
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return $this->getGroupsRecursive($uniqueDNs, $checked);
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}
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/**
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* @throws LdapException
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*/
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protected function getParentsOfGroup(string $groupDN): array
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{
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$groupsAttr = strtolower($this->config['group_attribute']);
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$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, $followReferrals);
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$read = $this->ldap->read($ldapConnection, $groupDN, '(objectClass=*)', [$groupsAttr]);
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$results = $this->ldap->getEntries($ldapConnection, $read);
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if ($results['count'] === 0) {
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return [];
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}
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return $this->extractGroupsFromSearchResponseEntry($results[0]);
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}
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/**
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* Extract an array of group DN values from the given LDAP search response entry
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*/
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protected function extractGroupsFromSearchResponseEntry(array $ldapEntry): array
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{
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$groupsAttr = strtolower($this->config['group_attribute']);
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$groupDNs = [];
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$count = 0;
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if (isset($ldapEntry[$groupsAttr]['count'])) {
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$count = (int) $ldapEntry[$groupsAttr]['count'];
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}
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for ($i = 0; $i < $count; $i++) {
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$dn = $ldapEntry[$groupsAttr][$i];
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if (!in_array($dn, $groupDNs)) {
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$groupDNs[] = $dn;
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}
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}
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return $groupDNs;
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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 $username): void
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{
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$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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