338 lines
11 KiB
PHP
338 lines
11 KiB
PHP
<?php namespace BookStack\Auth\Access;
|
|
|
|
use BookStack\Auth\User;
|
|
use BookStack\Exceptions\JsonDebugException;
|
|
use BookStack\Exceptions\LdapException;
|
|
use ErrorException;
|
|
|
|
/**
|
|
* Class LdapService
|
|
* Handles any app-specific LDAP tasks.
|
|
*/
|
|
class LdapService extends ExternalAuthService
|
|
{
|
|
|
|
protected $ldap;
|
|
protected $ldapConnection;
|
|
protected $config;
|
|
protected $enabled;
|
|
|
|
/**
|
|
* LdapService constructor.
|
|
*/
|
|
public function __construct(Ldap $ldap)
|
|
{
|
|
$this->ldap = $ldap;
|
|
$this->config = config('services.ldap');
|
|
$this->enabled = config('auth.method') === 'ldap';
|
|
}
|
|
|
|
/**
|
|
* Check if groups should be synced.
|
|
* @return bool
|
|
*/
|
|
public function shouldSyncGroups()
|
|
{
|
|
return $this->enabled && $this->config['user_to_groups'] !== false;
|
|
}
|
|
|
|
/**
|
|
* Search for attributes for a specific user on the ldap.
|
|
* @throws LdapException
|
|
*/
|
|
private function getUserWithAttributes(string $userName, array $attributes): ?array
|
|
{
|
|
$ldapConnection = $this->getConnection();
|
|
$this->bindSystemUser($ldapConnection);
|
|
|
|
// Find user
|
|
$userFilter = $this->buildFilter($this->config['user_filter'], ['user' => $userName]);
|
|
$baseDn = $this->config['base_dn'];
|
|
|
|
$followReferrals = $this->config['follow_referrals'] ? 1 : 0;
|
|
$this->ldap->setOption($ldapConnection, LDAP_OPT_REFERRALS, $followReferrals);
|
|
$users = $this->ldap->searchAndGetEntries($ldapConnection, $baseDn, $userFilter, $attributes);
|
|
if ($users['count'] === 0) {
|
|
return null;
|
|
}
|
|
|
|
return $users[0];
|
|
}
|
|
|
|
/**
|
|
* Get the details of a user from LDAP using the given username.
|
|
* User found via configurable user filter.
|
|
* @throws LdapException
|
|
*/
|
|
public function getUserDetails(string $userName): ?array
|
|
{
|
|
$idAttr = $this->config['id_attribute'];
|
|
$emailAttr = $this->config['email_attribute'];
|
|
$displayNameAttr = $this->config['display_name_attribute'];
|
|
|
|
$user = $this->getUserWithAttributes($userName, ['cn', 'dn', $idAttr, $emailAttr, $displayNameAttr]);
|
|
|
|
if ($user === null) {
|
|
return null;
|
|
}
|
|
|
|
$userCn = $this->getUserResponseProperty($user, 'cn', null);
|
|
$formatted = [
|
|
'uid' => $this->getUserResponseProperty($user, $idAttr, $user['dn']),
|
|
'name' => $this->getUserResponseProperty($user, $displayNameAttr, $userCn),
|
|
'dn' => $user['dn'],
|
|
'email' => $this->getUserResponseProperty($user, $emailAttr, null),
|
|
];
|
|
|
|
if ($this->config['dump_user_details']) {
|
|
throw new JsonDebugException([
|
|
'details_from_ldap' => $user,
|
|
'details_bookstack_parsed' => $formatted,
|
|
]);
|
|
}
|
|
|
|
return $formatted;
|
|
}
|
|
|
|
/**
|
|
* Get a property from an LDAP user response fetch.
|
|
* Handles properties potentially being part of an array.
|
|
* If the given key is prefixed with 'BIN;', that indicator will be stripped
|
|
* from the key and any fetched values will be converted from binary to hex.
|
|
*/
|
|
protected function getUserResponseProperty(array $userDetails, string $propertyKey, $defaultValue)
|
|
{
|
|
$isBinary = strpos($propertyKey, 'BIN;') === 0;
|
|
$propertyKey = strtolower($propertyKey);
|
|
$value = $defaultValue;
|
|
|
|
if ($isBinary) {
|
|
$propertyKey = substr($propertyKey, strlen('BIN;'));
|
|
}
|
|
|
|
if (isset($userDetails[$propertyKey])) {
|
|
$value = (is_array($userDetails[$propertyKey]) ? $userDetails[$propertyKey][0] : $userDetails[$propertyKey]);
|
|
if ($isBinary) {
|
|
$value = bin2hex($value);
|
|
}
|
|
}
|
|
|
|
return $value;
|
|
}
|
|
|
|
/**
|
|
* Check if the given credentials are valid for the given user.
|
|
* @throws LdapException
|
|
*/
|
|
public function validateUserCredentials(?array $ldapUserDetails, string $password): bool
|
|
{
|
|
if (is_null($ldapUserDetails)) {
|
|
return false;
|
|
}
|
|
|
|
$ldapConnection = $this->getConnection();
|
|
try {
|
|
$ldapBind = $this->ldap->bind($ldapConnection, $ldapUserDetails['dn'], $password);
|
|
} catch (ErrorException $e) {
|
|
$ldapBind = false;
|
|
}
|
|
|
|
return $ldapBind;
|
|
}
|
|
|
|
/**
|
|
* Bind the system user to the LDAP connection using the given credentials
|
|
* otherwise anonymous access is attempted.
|
|
* @param $connection
|
|
* @throws LdapException
|
|
*/
|
|
protected function bindSystemUser($connection)
|
|
{
|
|
$ldapDn = $this->config['dn'];
|
|
$ldapPass = $this->config['pass'];
|
|
|
|
$isAnonymous = ($ldapDn === false || $ldapPass === false);
|
|
if ($isAnonymous) {
|
|
$ldapBind = $this->ldap->bind($connection);
|
|
} else {
|
|
$ldapBind = $this->ldap->bind($connection, $ldapDn, $ldapPass);
|
|
}
|
|
|
|
if (!$ldapBind) {
|
|
throw new LdapException(($isAnonymous ? trans('errors.ldap_fail_anonymous') : trans('errors.ldap_fail_authed')));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the connection to the LDAP server.
|
|
* Creates a new connection if one does not exist.
|
|
* @return resource
|
|
* @throws LdapException
|
|
*/
|
|
protected function getConnection()
|
|
{
|
|
if ($this->ldapConnection !== null) {
|
|
return $this->ldapConnection;
|
|
}
|
|
|
|
// Check LDAP extension in installed
|
|
if (!function_exists('ldap_connect') && config('app.env') !== 'testing') {
|
|
throw new LdapException(trans('errors.ldap_extension_not_installed'));
|
|
}
|
|
|
|
// Check if TLS_INSECURE is set. The handle is set to NULL due to the nature of
|
|
// the LDAP_OPT_X_TLS_REQUIRE_CERT option. It can only be set globally and not per handle.
|
|
if ($this->config['tls_insecure']) {
|
|
$this->ldap->setOption(null, LDAP_OPT_X_TLS_REQUIRE_CERT, LDAP_OPT_X_TLS_NEVER);
|
|
}
|
|
|
|
$serverDetails = $this->parseServerString($this->config['server']);
|
|
$ldapConnection = $this->ldap->connect($serverDetails['host'], $serverDetails['port']);
|
|
|
|
if ($ldapConnection === false) {
|
|
throw new LdapException(trans('errors.ldap_cannot_connect'));
|
|
}
|
|
|
|
// Set any required options
|
|
if ($this->config['version']) {
|
|
$this->ldap->setVersion($ldapConnection, $this->config['version']);
|
|
}
|
|
|
|
$this->ldapConnection = $ldapConnection;
|
|
return $this->ldapConnection;
|
|
}
|
|
|
|
/**
|
|
* Parse a LDAP server string and return the host and port for a connection.
|
|
* Is flexible to formats such as 'ldap.example.com:8069' or 'ldaps://ldap.example.com'.
|
|
*/
|
|
protected function parseServerString(string $serverString): array
|
|
{
|
|
$serverNameParts = explode(':', $serverString);
|
|
|
|
// If we have a protocol just return the full string since PHP will ignore a separate port.
|
|
if ($serverNameParts[0] === 'ldaps' || $serverNameParts[0] === 'ldap') {
|
|
return ['host' => $serverString, 'port' => 389];
|
|
}
|
|
|
|
// Otherwise, extract the port out
|
|
$hostName = $serverNameParts[0];
|
|
$ldapPort = (count($serverNameParts) > 1) ? intval($serverNameParts[1]) : 389;
|
|
return ['host' => $hostName, 'port' => $ldapPort];
|
|
}
|
|
|
|
/**
|
|
* Build a filter string by injecting common variables.
|
|
*/
|
|
protected function buildFilter(string $filterString, array $attrs): string
|
|
{
|
|
$newAttrs = [];
|
|
foreach ($attrs as $key => $attrText) {
|
|
$newKey = '${' . $key . '}';
|
|
$newAttrs[$newKey] = $this->ldap->escape($attrText);
|
|
}
|
|
return strtr($filterString, $newAttrs);
|
|
}
|
|
|
|
/**
|
|
* Get the groups a user is a part of on ldap.
|
|
* @throws LdapException
|
|
*/
|
|
public function getUserGroups(string $userName): array
|
|
{
|
|
$groupsAttr = $this->config['group_attribute'];
|
|
$user = $this->getUserWithAttributes($userName, [$groupsAttr]);
|
|
|
|
if ($user === null) {
|
|
return [];
|
|
}
|
|
|
|
$userGroups = $this->groupFilter($user);
|
|
$userGroups = $this->getGroupsRecursive($userGroups, []);
|
|
return $userGroups;
|
|
}
|
|
|
|
/**
|
|
* Get the parent groups of an array of groups.
|
|
* @throws LdapException
|
|
*/
|
|
private function getGroupsRecursive(array $groupsArray, array $checked): array
|
|
{
|
|
$groupsToAdd = [];
|
|
foreach ($groupsArray as $groupName) {
|
|
if (in_array($groupName, $checked)) {
|
|
continue;
|
|
}
|
|
|
|
$parentGroups = $this->getGroupGroups($groupName);
|
|
$groupsToAdd = array_merge($groupsToAdd, $parentGroups);
|
|
$checked[] = $groupName;
|
|
}
|
|
|
|
$groupsArray = array_unique(array_merge($groupsArray, $groupsToAdd), SORT_REGULAR);
|
|
|
|
if (empty($groupsToAdd)) {
|
|
return $groupsArray;
|
|
}
|
|
|
|
return $this->getGroupsRecursive($groupsArray, $checked);
|
|
}
|
|
|
|
/**
|
|
* Get the parent groups of a single group.
|
|
* @throws LdapException
|
|
*/
|
|
private function getGroupGroups(string $groupName): array
|
|
{
|
|
$ldapConnection = $this->getConnection();
|
|
$this->bindSystemUser($ldapConnection);
|
|
|
|
$followReferrals = $this->config['follow_referrals'] ? 1 : 0;
|
|
$this->ldap->setOption($ldapConnection, LDAP_OPT_REFERRALS, $followReferrals);
|
|
|
|
$baseDn = $this->config['base_dn'];
|
|
$groupsAttr = strtolower($this->config['group_attribute']);
|
|
|
|
$groupFilter = 'CN=' . $this->ldap->escape($groupName);
|
|
$groups = $this->ldap->searchAndGetEntries($ldapConnection, $baseDn, $groupFilter, [$groupsAttr]);
|
|
if ($groups['count'] === 0) {
|
|
return [];
|
|
}
|
|
|
|
return $this->groupFilter($groups[0]);
|
|
}
|
|
|
|
/**
|
|
* Filter out LDAP CN and DN language in a ldap search return.
|
|
* Gets the base CN (common name) of the string.
|
|
*/
|
|
protected function groupFilter(array $userGroupSearchResponse): array
|
|
{
|
|
$groupsAttr = strtolower($this->config['group_attribute']);
|
|
$ldapGroups = [];
|
|
$count = 0;
|
|
|
|
if (isset($userGroupSearchResponse[$groupsAttr]['count'])) {
|
|
$count = (int)$userGroupSearchResponse[$groupsAttr]['count'];
|
|
}
|
|
|
|
for ($i = 0; $i < $count; $i++) {
|
|
$dnComponents = $this->ldap->explodeDn($userGroupSearchResponse[$groupsAttr][$i], 1);
|
|
if (!in_array($dnComponents[0], $ldapGroups)) {
|
|
$ldapGroups[] = $dnComponents[0];
|
|
}
|
|
}
|
|
|
|
return $ldapGroups;
|
|
}
|
|
|
|
/**
|
|
* Sync the LDAP groups to the user roles for the current user.
|
|
* @throws LdapException
|
|
*/
|
|
public function syncGroups(User $user, string $username)
|
|
{
|
|
$userLdapGroups = $this->getUserGroups($username);
|
|
$this->syncWithGroups($user, $userLdapGroups);
|
|
}
|
|
}
|