From 89f4e16cdb90d4fe84597255a4c989adc2f8402a Mon Sep 17 00:00:00 2001
From: Arthur Schiwon <blizzz@arthur-schiwon.de>
Date: Mon, 11 Sep 2017 12:10:32 +0200
Subject: [PATCH] fix limit-flaw in search on paged results

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>
---
 apps/user_ldap/lib/Access.php                    | 16 ++++++++--------
 .../Integration/Lib/IntegrationTestPaging.php    | 13 +++++++++----
 2 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/apps/user_ldap/lib/Access.php b/apps/user_ldap/lib/Access.php
index 69e1f3c52f..e036f6ccb8 100644
--- a/apps/user_ldap/lib/Access.php
+++ b/apps/user_ldap/lib/Access.php
@@ -1149,9 +1149,9 @@ class Access extends LDAPUtility implements IUserTools {
 	 * @return array with the search result
 	 */
 	public function search($filter, $base, $attr = null, $limit = null, $offset = null, $skipHandling = false) {
-		if($limit <= 0) {
-			//otherwise search will fail
-			$limit = null;
+		$limitPerPage = intval($this->connection->ldapPagingSize);
+		if(!is_null($limit) && $limit < $limitPerPage && $limit > 0) {
+			$limitPerPage = $limit;
 		}
 
 		/* ++ Fixing RHDS searches with pages with zero results ++
@@ -1163,7 +1163,7 @@ class Access extends LDAPUtility implements IUserTools {
 		$findings = array();
 		$savedoffset = $offset;
 		do {
-			$search = $this->executeSearch($filter, $base, $attr, $limit, $offset);
+			$search = $this->executeSearch($filter, $base, $attr, $limitPerPage, $offset);
 			if($search === false) {
 				return array();
 			}
@@ -1174,7 +1174,7 @@ class Access extends LDAPUtility implements IUserTools {
 				//i.e. result do not need to be fetched, we just need the cookie
 				//thus pass 1 or any other value as $iFoundItems because it is not
 				//used
-				$this->processPagedSearchStatus($sr, $filter, $base, 1, $limit,
+				$this->processPagedSearchStatus($sr, $filter, $base, 1, $limitPerPage,
 								$offset, $pagedSearchOK,
 								$skipHandling);
 				return array();
@@ -1185,10 +1185,10 @@ class Access extends LDAPUtility implements IUserTools {
 			}
 
 			$continue = $this->processPagedSearchStatus($sr, $filter, $base, $findings['count'],
-								$limit, $offset, $pagedSearchOK,
+				$limitPerPage, $offset, $pagedSearchOK,
 										$skipHandling);
-			$offset += $limit;
-		} while ($continue && $pagedSearchOK && $findings['count'] < $limit);
+			$offset += $limitPerPage;
+		} while ($continue && $pagedSearchOK && ($limit === null || $findings['count'] < $limit));
 		// reseting offset
 		$offset = $savedoffset;
 
diff --git a/apps/user_ldap/tests/Integration/Lib/IntegrationTestPaging.php b/apps/user_ldap/tests/Integration/Lib/IntegrationTestPaging.php
index 44ee1c3bb5..f9be6d6f67 100644
--- a/apps/user_ldap/tests/Integration/Lib/IntegrationTestPaging.php
+++ b/apps/user_ldap/tests/Integration/Lib/IntegrationTestPaging.php
@@ -47,6 +47,13 @@ class IntegrationTestPaging extends AbstractIntegrationTest {
 		$this->backend = new User_LDAP($this->access, \OC::$server->getConfig(), \OC::$server->getNotificationManager());
 	}
 
+	public function initConnection() {
+		parent::initConnection();
+		$this->connection->setConfiguration([
+			'ldapPagingSize' => 1
+		]);
+	}
+
 	/**
 	 * tests that paging works properly against a simple example (reading all
 	 * of few users in smallest steps)
@@ -54,20 +61,18 @@ class IntegrationTestPaging extends AbstractIntegrationTest {
 	 * @return bool
 	 */
 	protected function case1() {
-		$limit = 1;
 		$offset = 0;
 
 		$filter = 'objectclass=inetorgperson';
 		$attributes = ['cn', 'dn'];
 		$users = [];
 		do {
-			$result = $this->access->searchUsers($filter, $attributes, $limit, $offset);
+			$result = $this->access->searchUsers($filter, $attributes, null, $offset);
 			foreach($result as $user) {
 				$users[] = $user['cn'];
 			}
-			$offset += $limit;
+			$offset += count($users);
 		} while ($this->access->hasMoreResults());
-
 		if(count($users) === 2) {
 			return true;
 		}