Fix case-insensitive match in ACL checking

ACL checking of DokuWiki is currently always case-sensitive
regardless of auth backend setting ($auth->isCaseSensitive).
This commit enables case-insensitive match in the same way
of auth_isMember().

_test/tests/inc/auth_aclcheck_caseinsensitive.test.php

+<?php
+
+class auth_acl_caseinsensitive_auth extends auth_basic {
+    function isCaseSensitive() {
+        return false;
+    }
+}
+
+class auth_acl_caseinsensitive_test extends DokuWikiTest {
+    protected $oldConf;
+    protected $oldAuth;
+    protected $oldAuthAcl;
+
+    function setup() {
+        global $conf;
+        global $auth;
+        global $AUTH_ACL;
+
+        $this->oldConf    = $conf;
+        $this->oldAuth    = $auth;
+        $this->oldAuthAcl = $AUTH_ACL;
+
+        $auth = new auth_acl_caseinsensitive_auth();
+    }
+
+    function teardown() {
+        global $conf;
+        global $AUTH_ACL;
+        global $auth;
+
+        $conf     = $this->oldConf;
+        $auth     = $this->oldAuth;
+        $AUTH_ACL = $this->oldAuthAcl;
+    }
+
+    function test_multiadmin_restricted_ropage() {
+        global $conf;
+        global $AUTH_ACL;
+
+        $conf['superuser'] = 'John,doe,@Admin1,@admin2';
+        $conf['useacl']    = 1;
+
+        $AUTH_ACL = array(
+            '*              @ALL       0',
+            '*              @Group1    8',
+            '*              @group2    8',
+            'namespace:page @Group1    1',
+            'namespace:page @group2    1',
+        );
+
+        // anonymous user
+        $this->assertEquals(auth_aclcheck('page',           '', array()), AUTH_NONE);
+        $this->assertEquals(auth_aclcheck('namespace:page', '', array()), AUTH_NONE);
+        $this->assertEquals(auth_aclcheck('namespace:*',    '', array()), AUTH_NONE);
+
+        // user with no matching group
+        $this->assertEquals(auth_aclcheck('page',           'jill', array('foo')), AUTH_NONE);
+        $this->assertEquals(auth_aclcheck('namespace:page', 'jill', array('foo')), AUTH_NONE);
+        $this->assertEquals(auth_aclcheck('namespace:*',    'jill', array('foo')), AUTH_NONE);
+
+        // user with matching group 1
+        $this->assertEquals(auth_aclcheck('page',           'jill', array('foo', 'group1')), AUTH_UPLOAD);
+        $this->assertEquals(auth_aclcheck('namespace:page', 'jill', array('foo', 'group1')), AUTH_READ);
+        $this->assertEquals(auth_aclcheck('namespace:*',    'jill', array('foo', 'group1')), AUTH_UPLOAD);
+
+        // user with matching group 2
+        $this->assertEquals(auth_aclcheck('page',           'jill', array('foo', 'Group2')), AUTH_UPLOAD);
+        $this->assertEquals(auth_aclcheck('namespace:page', 'jill', array('foo', 'Group2')), AUTH_READ);
+        $this->assertEquals(auth_aclcheck('namespace:*',    'jill', array('foo', 'Group2')), AUTH_UPLOAD);
+
+        // super user John
+        $this->assertEquals(auth_aclcheck('page',           'john', array('foo')), AUTH_ADMIN);
+        $this->assertEquals(auth_aclcheck('namespace:page', 'john', array('foo')), AUTH_ADMIN);
+        $this->assertEquals(auth_aclcheck('namespace:*',    'john', array('foo')), AUTH_ADMIN);
+
+        // super user doe
+        $this->assertEquals(auth_aclcheck('page',           'Doe', array('foo')), AUTH_ADMIN);
+        $this->assertEquals(auth_aclcheck('namespace:page', 'Doe', array('foo')), AUTH_ADMIN);
+        $this->assertEquals(auth_aclcheck('namespace:*',    'Doe', array('foo')), AUTH_ADMIN);
+
+        // user with matching admin group 1
+        $this->assertEquals(auth_aclcheck('page',           'jill', array('foo', 'admin1')), AUTH_ADMIN);
+        $this->assertEquals(auth_aclcheck('namespace:page', 'jill', array('foo', 'admin1')), AUTH_ADMIN);
+        $this->assertEquals(auth_aclcheck('namespace:*',    'jill', array('foo', 'admin1')), AUTH_ADMIN);
+
+        // user with matching admin group 2
+        $this->assertEquals(auth_aclcheck('page',           'jill', array('foo', 'Admin2')), AUTH_ADMIN);
+        $this->assertEquals(auth_aclcheck('namespace:page', 'jill', array('foo', 'Admin2')), AUTH_ADMIN);
+        $this->assertEquals(auth_aclcheck('namespace:*',    'jill', array('foo', 'Admin2')), AUTH_ADMIN);
+    }
+
+    /*
+     * Test aclcheck on @ALL group
+     *
+     * The default permission for @ALL group is AUTH_NONE. So we use an
+     * ACL entry which grants @ALL group an AUTH_READ permission to see
+     * whether ACL matching is properly done or not.
+     */
+    function test_restricted_allread() {
+        global $conf;
+        global $AUTH_ACL;
+
+        $conf['superuser'] = 'john';
+        $conf['useacl']    = 1;
+
+        $AUTH_ACL = array(
+            '*           @ALL           1',
+            '*           @group1        8',
+        );
+
+        // anonymous user
+        $this->assertEquals(auth_aclcheck('page',           '', array()), AUTH_READ);
+        $this->assertEquals(auth_aclcheck('namespace:page', '', array()), AUTH_READ);
+        $this->assertEquals(auth_aclcheck('namespace:*',    '', array()), AUTH_READ);
+
+        // user with no matching group
+        $this->assertEquals(auth_aclcheck('page',           'jill', array('foo')), AUTH_READ);
+        $this->assertEquals(auth_aclcheck('namespace:page', 'jill', array('foo')), AUTH_READ);
+        $this->assertEquals(auth_aclcheck('namespace:*',    'jill', array('foo')), AUTH_READ);
+
+        // user with matching group
+        $this->assertEquals(auth_aclcheck('page',           'jill', array('foo', 'Group1')), AUTH_UPLOAD);
+        $this->assertEquals(auth_aclcheck('namespace:page', 'jill', array('foo', 'Group1')), AUTH_UPLOAD);
+        $this->assertEquals(auth_aclcheck('namespace:*',    'jill', array('foo', 'Group1')), AUTH_UPLOAD);
+
+        // super user
+        $this->assertEquals(auth_aclcheck('page',           'John', array('foo')), AUTH_ADMIN);
+        $this->assertEquals(auth_aclcheck('namespace:page', 'John', array('foo')), AUTH_ADMIN);
+        $this->assertEquals(auth_aclcheck('namespace:*',    'John', array('foo')), AUTH_ADMIN);
+    }
+}

inc/auth.php

@@ -535,9 +535,10 @@ function auth_aclcheck($id, $user, $groups) {
         return AUTH_ADMIN;
     }
 
-    $ci = '';
-    if(!$auth->isCaseSensitive()) $ci = 'ui';
-
+    if(!$auth->isCaseSensitive()) {
+        $user   = utf8_strtolower($user);
+        $groups = array_map('utf8_strtolower', $groups);
+    }
     $user   = $auth->cleanUser($user);
     $groups = array_map(array($auth, 'cleanGroup'), (array) $groups);
     $user   = auth_nameencode($user);
@@ -561,11 +562,14 @@ function auth_aclcheck($id, $user, $groups) {
     }
 
     //check exact match first
-    $matches = preg_grep('/^'.preg_quote($id, '/').'\s+(\S+)\s+/'.$ci, $AUTH_ACL);
+    $matches = preg_grep('/^'.preg_quote($id, '/').'\s+(\S+)\s+/u', $AUTH_ACL);
     if(count($matches)) {
         foreach($matches as $match) {
             $match = preg_replace('/#.*$/', '', $match); //ignore comments
             $acl   = preg_split('/\s+/', $match);
+            if(!$auth->isCaseSensitive() && $acl[1] !== '@ALL') {
+                $acl[1] = utf8_strtolower($acl[1]);
+            }
             if(!in_array($acl[1], $groups)) {
                 continue;
             }
@@ -588,11 +592,14 @@ function auth_aclcheck($id, $user, $groups) {
     }
 
     do {
-        $matches = preg_grep('/^'.preg_quote($path, '/').'\s+(\S+)\s+/'.$ci, $AUTH_ACL);
+        $matches = preg_grep('/^'.preg_quote($path, '/').'\s+(\S+)\s+/u', $AUTH_ACL);
         if(count($matches)) {
             foreach($matches as $match) {
                 $match = preg_replace('/#.*$/', '', $match); //ignore comments
                 $acl   = preg_split('/\s+/', $match);
+                if(!$auth->isCaseSensitive() && $acl[1] !== '@ALL') {
+                    $acl[1] = utf8_strtolower($acl[1]);
+                }
                 if(!in_array($acl[1], $groups)) {
                     continue;
                 }