124 lines
3.9 KiB
PHP
124 lines
3.9 KiB
PHP
<?php namespace BookStack\Services;
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use BookStack\Exceptions\LdapException;
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use Illuminate\Contracts\Auth\Authenticatable;
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class LdapService
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{
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protected $ldapConnection;
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/**
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* Get the details of a user from LDAP using the given username.
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* User found via configurable user filter.
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* @param $userName
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* @return array|null
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* @throws LdapException
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*/
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public function getUserDetails($userName)
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{
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$ldapConnection = $this->getConnection();
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// Find user
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$userFilter = $this->buildFilter(config('services.ldap.user_filter'), ['user' => $userName]);
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$baseDn = config('services.ldap.base_dn');
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$ldapSearch = ldap_search($ldapConnection, $baseDn, $userFilter, ['cn', 'uid', 'dn', 'mail']);
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$users = ldap_get_entries($ldapConnection, $ldapSearch);
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if ($users['count'] === 0) return null;
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$user = $users[0];
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return [
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'uid' => $user['uid'][0],
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'name' => $user['cn'][0],
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'dn' => $user['dn'],
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'email' => (isset($user['mail'])) ? $user['mail'][0] : null
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];
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}
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/**
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* @param Authenticatable $user
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* @param string $username
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* @param string $password
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* @return bool
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* @throws LdapException
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*/
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public function validateUserCredentials(Authenticatable $user, $username, $password)
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{
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$ldapUser = $this->getUserDetails($username);
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if ($ldapUser === null) return false;
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if ($ldapUser['uid'] !== $user->external_auth_id) return false;
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$ldapConnection = $this->getConnection();
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$ldapBind = @ldap_bind($ldapConnection, $ldapUser['dn'], $password);
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return $ldapBind;
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}
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/**
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* Bind the system user to the LDAP connection using the given credentials
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* otherwise anonymous access is attempted.
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* @param $connection
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* @throws LdapException
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*/
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protected function bindSystemUser($connection)
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{
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$ldapDn = config('services.ldap.dn');
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$ldapPass = config('services.ldap.pass');
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$isAnonymous = ($ldapDn === false || $ldapPass === false);
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if ($isAnonymous) {
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$ldapBind = ldap_bind($connection);
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} else {
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$ldapBind = ldap_bind($connection, $ldapDn, $ldapPass);
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}
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if (!$ldapBind) throw new LdapException('LDAP access failed using ' . $isAnonymous ? ' anonymous bind.' : ' given dn & pass details');
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}
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/**
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* Get the connection to the LDAP server.
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* Creates a new connection if one does not exist.
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* @return resource
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* @throws LdapException
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*/
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protected function getConnection()
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{
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if ($this->ldapConnection !== null) return $this->ldapConnection;
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// Check LDAP extension in installed
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if (!function_exists('ldap_connect')) {
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throw new LdapException('LDAP PHP extension not installed');
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}
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// Get port from server string if specified.
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$ldapServer = explode(':', config('services.ldap.server'));
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$ldapConnection = ldap_connect($ldapServer[0], count($ldapServer) > 1 ? $ldapServer[1] : 389);
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if ($ldapConnection === false) {
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throw new LdapException('Cannot connect to ldap server, Initial connection failed');
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}
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// Set any required options
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ldap_set_option($ldapConnection, LDAP_OPT_PROTOCOL_VERSION, 3); // TODO - make configurable
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$this->ldapConnection = $ldapConnection;
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return $this->ldapConnection;
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}
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/**
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* Build a filter string by injecting common variables.
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* @param $filterString
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* @param array $attrs
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* @return string
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*/
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protected function buildFilter($filterString, array $attrs)
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{
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$newAttrs = [];
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foreach ($attrs as $key => $attrText) {
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$newKey = '${' . $key . '}';
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$newAttrs[$newKey] = $attrText;
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}
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return strtr($filterString, $newAttrs);
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}
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} |