mirror of
https://github.com/BookStackApp/BookStack.git
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307 lines
9.6 KiB
PHP
307 lines
9.6 KiB
PHP
<?php
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namespace BookStack\Auth\Access\Ldap;
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use BookStack\Auth\Access\GroupSyncService;
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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\Exceptions\LdapFailedBindException;
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use BookStack\Uploads\UserAvatars;
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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 LdapConnectionManager $ldap;
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protected GroupSyncService $groupSyncService;
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protected UserAvatars $userAvatars;
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protected LdapConfig $config;
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public function __construct(LdapConnectionManager $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 = new LdapConfig(config('services.ldap'));
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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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protected function getUserWithAttributes(string $userName, array $attributes): ?array
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{
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$connection = $this->ldap->startSystemBind($this->config);
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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->get('user_filter'), ['user' => $userName]);
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$baseDn = $this->config->get('base_dn');
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$followReferrals = $this->config->get('follow_referrals') ? 1 : 0;
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$connection->setOption(LDAP_OPT_REFERRALS, $followReferrals);
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$users = $connection->searchAndGetEntries($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 = $this->config->get('id_attribute');
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$emailAttr = $this->config->get('email_attribute');
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$displayNameAttr = $this->config->get('display_name_attribute');
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$thumbnailAttr = $this->config->get('thumbnail_attribute');
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$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->get('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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try {
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$this->ldap->startBind($ldapUserDetails['dn'], $password, $this->config);
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} catch (LdapFailedBindException $e) {
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return false;
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} catch (LdapException $e) {
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throw $e;
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}
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return true;
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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[$newKey] = LdapConnection::escape($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 = $this->config->get('group_attribute');
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$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->get('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 $groupName): array
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{
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$connection = $this->ldap->startSystemBind($this->config);
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$followReferrals = $this->config->get('follow_referrals') ? 1 : 0;
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$connection->setOption(LDAP_OPT_REFERRALS, $followReferrals);
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$baseDn = $this->config->get('base_dn');
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$groupsAttr = strtolower($this->config->get('group_attribute'));
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$groupFilter = 'CN=' . LdapConnection::escape($groupName);
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$groups = $connection->searchAndGetEntries($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($this->config->get('group_attribute'));
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$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 = LdapConnection::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->get('remove_from_groups'));
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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->config->get('user_to_groups') !== false;
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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 $ldapUserDetails): void
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{
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if (is_null($this->config->get('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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