Made LDAP auth ID attribute configurable

- Allows the field that gets stored as the "External Authentication ID"
to be configurable. Defined as LDAP_ID_ATTRIBUTE=uid in .env.
- Added test to cover usage.
- Also now auto-lowercases when searching for attributes in LDAP
response since PHP always provides them as lower case.

Closes #592.

.env.example.complete

@@ -191,6 +191,7 @@ LDAP_PASS=false
 LDAP_USER_FILTER=false
 LDAP_VERSION=false
 LDAP_TLS_INSECURE=false
+LDAP_ID_ATTRIBUTE=uid
 LDAP_EMAIL_ATTRIBUTE=mail
 LDAP_DISPLAY_NAME_ATTRIBUTE=cn
 LDAP_FOLLOW_REFERRALS=true

app/Auth/Access/LdapService.php

@@ -1,17 +1,16 @@
 <?php namespace BookStack\Auth\Access;
 
-use BookStack\Auth\Access;
 use BookStack\Auth\User;
 use BookStack\Auth\UserRepo;
 use BookStack\Exceptions\LdapException;
+use ErrorException;
 use Illuminate\Contracts\Auth\Authenticatable;
 
 /**
  * Class LdapService
  * Handles any app-specific LDAP tasks.
- * @package BookStack\Services
  */
-class LdapService extends Access\ExternalAuthService
+class LdapService extends ExternalAuthService
 {
 
     protected $ldap;
@@ -22,10 +21,8 @@ class LdapService extends Access\ExternalAuthService
 
     /**
      * LdapService constructor.
-     * @param Ldap $ldap
-     * @param \BookStack\Auth\UserRepo $userRepo
      */
-    public function __construct(Access\Ldap $ldap, UserRepo $userRepo)
+    public function __construct(Ldap $ldap, UserRepo $userRepo)
     {
         $this->ldap = $ldap;
         $this->config = config('services.ldap');
@@ -43,13 +40,10 @@ class LdapService extends Access\ExternalAuthService
     }
 
     /**
-     * Search for attributes for a specific user on the ldap
+     * Search for attributes for a specific user on the ldap.
-     * @param string $userName
-     * @param array $attributes
-     * @return null|array
      * @throws LdapException
      */
-    private function getUserWithAttributes($userName, $attributes)
+    private function getUserWithAttributes(string $userName, array $attributes): ?array
     {
         $ldapConnection = $this->getConnection();
         $this->bindSystemUser($ldapConnection);
@@ -71,16 +65,15 @@ class LdapService extends Access\ExternalAuthService
     /**
      * Get the details of a user from LDAP using the given username.
      * User found via configurable user filter.
-     * @param $userName
-     * @return array|null
      * @throws LdapException
      */
-    public function getUserDetails($userName)
+    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', 'uid', 'dn', $emailAttr, $displayNameAttr]);
+        $user = $this->getUserWithAttributes($userName, ['cn', 'dn', $idAttr, $emailAttr, $displayNameAttr]);
 
         if ($user === null) {
             return null;
@@ -88,7 +81,7 @@ class LdapService extends Access\ExternalAuthService
 
         $userCn = $this->getUserResponseProperty($user, 'cn', null);
         return [
-            'uid'   => $this->getUserResponseProperty($user, 'uid', $user['dn']),
+            'uid'   => $this->getUserResponseProperty($user, $idAttr, $user['dn']),
             'name'  => $this->getUserResponseProperty($user, $displayNameAttr, $userCn),
             'dn'    => $user['dn'],
             'email' => $this->getUserResponseProperty($user, $emailAttr, null),
@@ -98,13 +91,10 @@ class LdapService extends Access\ExternalAuthService
     /**
      * Get a property from an LDAP user response fetch.
      * Handles properties potentially being part of an array.
-     * @param array $userDetails
-     * @param string $propertyKey
-     * @param $defaultValue
-     * @return mixed
      */
     protected function getUserResponseProperty(array $userDetails, string $propertyKey, $defaultValue)
     {
+        $propertyKey = strtolower($propertyKey);
         if (isset($userDetails[$propertyKey])) {
             return (is_array($userDetails[$propertyKey]) ? $userDetails[$propertyKey][0] : $userDetails[$propertyKey]);
         }
@@ -113,13 +103,10 @@ class LdapService extends Access\ExternalAuthService
     }
 
     /**
-     * @param Authenticatable $user
+     * Check if the given credentials are valid for the given user.
-     * @param string $username
-     * @param string $password
-     * @return bool
      * @throws LdapException
      */
-    public function validateUserCredentials(Authenticatable $user, $username, $password)
+    public function validateUserCredentials(Authenticatable $user, string $username, string $password): bool
     {
         $ldapUser = $this->getUserDetails($username);
         if ($ldapUser === null) {
@@ -133,7 +120,7 @@ class LdapService extends Access\ExternalAuthService
         $ldapConnection = $this->getConnection();
         try {
             $ldapBind = $this->ldap->bind($ldapConnection, $ldapUser['dn'], $password);
-        } catch (\ErrorException $e) {
+        } catch (ErrorException $e) {
             $ldapBind = false;
         }
 
@@ -203,12 +190,10 @@ class LdapService extends Access\ExternalAuthService
     }
 
     /**
-     * Parse a LDAP server string and return the host and port for
+     * Parse a LDAP server string and return the host and port for a connection.
-     * a connection. Is flexible to formats such as 'ldap.example.com:8069' or 'ldaps://ldap.example.com'
+     * Is flexible to formats such as 'ldap.example.com:8069' or 'ldaps://ldap.example.com'.
-     * @param $serverString
-     * @return array
      */
-    protected function parseServerString($serverString)
+    protected function parseServerString(string $serverString): array
     {
         $serverNameParts = explode(':', $serverString);
 
@@ -225,11 +210,8 @@ class LdapService extends Access\ExternalAuthService
 
     /**
      * Build a filter string by injecting common variables.
-     * @param string $filterString
-     * @param array $attrs
-     * @return string
      */
-    protected function buildFilter($filterString, array $attrs)
+    protected function buildFilter(string $filterString, array $attrs): string
     {
         $newAttrs = [];
         foreach ($attrs as $key => $attrText) {
@@ -240,12 +222,10 @@ class LdapService extends Access\ExternalAuthService
     }
 
     /**
-     * Get the groups a user is a part of on ldap
+     * Get the groups a user is a part of on ldap.
-     * @param string $userName
-     * @return array
      * @throws LdapException
      */
-    public function getUserGroups($userName)
+    public function getUserGroups(string $userName): array
     {
         $groupsAttr = $this->config['group_attribute'];
         $user = $this->getUserWithAttributes($userName, [$groupsAttr]);
@@ -260,40 +240,36 @@ class LdapService extends Access\ExternalAuthService
     }
 
     /**
-     * Get the parent groups of an array of groups
+     * Get the parent groups of an array of groups.
-     * @param array $groupsArray
-     * @param array $checked
-     * @return array
      * @throws LdapException
      */
-    private function getGroupsRecursive($groupsArray, $checked)
+    private function getGroupsRecursive(array $groupsArray, array $checked): array
     {
-        $groups_to_add = [];
+        $groupsToAdd = [];
         foreach ($groupsArray as $groupName) {
             if (in_array($groupName, $checked)) {
                 continue;
             }
 
-            $groupsToAdd = $this->getGroupGroups($groupName);
+            $parentGroups = $this->getGroupGroups($groupName);
-            $groups_to_add = array_merge($groups_to_add, $groupsToAdd);
+            $groupsToAdd = array_merge($groupsToAdd, $parentGroups);
             $checked[] = $groupName;
         }
-        $groupsArray = array_unique(array_merge($groupsArray, $groups_to_add), SORT_REGULAR);
 
-        if (!empty($groups_to_add)) {
+        $groupsArray = array_unique(array_merge($groupsArray, $groupsToAdd), SORT_REGULAR);
-            return $this->getGroupsRecursive($groupsArray, $checked);
+
-        } else {
+        if (empty($groupsToAdd)) {
             return $groupsArray;
         }
+
+        return $this->getGroupsRecursive($groupsArray, $checked);
     }
 
     /**
-     * Get the parent groups of a single group
+     * Get the parent groups of a single group.
-     * @param string $groupName
-     * @return array
      * @throws LdapException
      */
-    private function getGroupGroups($groupName)
+    private function getGroupGroups(string $groupName): array
     {
         $ldapConnection = $this->getConnection();
         $this->bindSystemUser($ldapConnection);
@@ -310,17 +286,14 @@ class LdapService extends Access\ExternalAuthService
             return [];
         }
 
-        $groupGroups = $this->groupFilter($groups[0]);
+        return $this->groupFilter($groups[0]);
-        return $groupGroups;
     }
 
     /**
-     * Filter out LDAP CN and DN language in a ldap search return
+     * Filter out LDAP CN and DN language in a ldap search return.
-     * Gets the base CN (common name) of the string
+     * Gets the base CN (common name) of the string.
-     * @param array $userGroupSearchResponse
-     * @return array
      */
-    protected function groupFilter(array $userGroupSearchResponse)
+    protected function groupFilter(array $userGroupSearchResponse): array
     {
         $groupsAttr = strtolower($this->config['group_attribute']);
         $ldapGroups = [];
@@ -341,9 +314,7 @@ class LdapService extends Access\ExternalAuthService
     }
 
     /**
-     * Sync the LDAP groups to the user roles for the current user
+     * Sync the LDAP groups to the user roles for the current user.
-     * @param \BookStack\Auth\User $user
-     * @param string $username
      * @throws LdapException
      */
     public function syncGroups(User $user, string $username)

app/Config/services.php

@@ -123,6 +123,7 @@ return [
         'base_dn' => env('LDAP_BASE_DN', false),
         'user_filter' => env('LDAP_USER_FILTER', '(&(uid=${user}))'),
         'version' => env('LDAP_VERSION', false),
+        'id_attribute' => env('LDAP_ID_ATTRIBUTE', 'uid'),
         'email_attribute' => env('LDAP_EMAIL_ATTRIBUTE', 'mail'),
         'display_name_attribute' => env('LDAP_DISPLAY_NAME_ATTRIBUTE', 'cn'),
         'follow_referrals' => env('LDAP_FOLLOW_REFERRALS', false),

tests/Auth/LdapTest.php

@@ -24,6 +24,7 @@ class LdapTest extends BrowserKitTest
             'services.ldap.base_dn' => 'dc=ldap,dc=local',
             'services.ldap.email_attribute' => 'mail',
             'services.ldap.display_name_attribute' => 'cn',
+            'services.ldap.id_attribute' => 'uid',
             'services.ldap.user_to_groups' => false,
             'auth.providers.users.driver' => 'ldap',
         ]);
@@ -102,6 +103,32 @@ class LdapTest extends BrowserKitTest
             ->seeInDatabase('users', ['email' => $this->mockUser->email, 'email_confirmed' => false, 'external_auth_id' => $ldapDn]);
     }
 
+    public function test_a_custom_uid_attribute_can_be_specified_and_is_used_properly()
+    {
+        config()->set(['services.ldap.id_attribute' => 'my_custom_id']);
+        $this->mockLdap->shouldReceive('connect')->once()->andReturn($this->resourceId);
+        $this->mockLdap->shouldReceive('setVersion')->once();
+        $ldapDn = 'cn=test-user,dc=test' . config('services.ldap.base_dn');
+        $this->mockLdap->shouldReceive('setOption')->times(2);
+        $this->mockLdap->shouldReceive('searchAndGetEntries')->times(2)
+            ->with($this->resourceId, config('services.ldap.base_dn'), \Mockery::type('string'), \Mockery::type('array'))
+            ->andReturn(['count' => 1, 0 => [
+                'cn' => [$this->mockUser->name],
+                'dn' => $ldapDn,
+                'my_custom_id' => ['cooluser456'],
+                'mail' => [$this->mockUser->email]
+            ]]);
+
+
+        $this->mockLdap->shouldReceive('bind')->times(3)->andReturn(true);
+        $this->mockEscapes(2);
+
+        $this->mockUserLogin()
+            ->seePageIs('/')
+            ->see($this->mockUser->name)
+            ->seeInDatabase('users', ['email' => $this->mockUser->email, 'email_confirmed' => false, 'external_auth_id' => 'cooluser456']);
+    }
+
     public function test_initial_incorrect_details()
     {
         $this->mockLdap->shouldReceive('connect')->once()->andReturn($this->resourceId);
@@ -365,7 +392,7 @@ class LdapTest extends BrowserKitTest
                 'uid' => [$this->mockUser->name],
                 'cn' => [$this->mockUser->name],
                 'dn' => ['dc=test' . config('services.ldap.base_dn')],
-                'displayName' => 'displayNameAttribute'
+                'displayname' => 'displayNameAttribute'
             ]]);
         $this->mockLdap->shouldReceive('bind')->times(6)->andReturn(true);
         $this->mockEscapes(4);