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FIX Privilege escalation through Group hierarchy setting (SS-2013-003)

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See http://www.silverstripe.org/ss-2013-003-privilege-escalation-through-group-hierarchy-setting/
This commit is contained in:
Ingo Schommer 2013-08-30 13:58:37 +02:00
parent 84a8b21936
commit 797951595b
4 changed files with 158 additions and 57 deletions
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15
docs/en/changelogs/2.4.12.md Normal file
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@ -0,0 +1,15 @@
# 2.4.12
## Overview
### Security: Privilege escalation through Group hierarchy setting (SS-2013-003)
See [announcement](http://www.silverstripe.org/ss-2013-003-privilege-escalation-through-group-hierarchy-setting/)
### Security: Privilege escalation through Group and Member CSV upload (SS-2013-004)
See [announcement](http://www.silverstripe.org/ss-2013-004-privilege-escalation-through-group-and-member-csv-upload/)
### Security: Privilege escalation through APPLY_ROLES assignment (SS-2013-005)
See [announcement](http://www.silverstripe.org/ss-2013-005-privilege-escalation-through-apply-roles-assignment/)

27
security/Group.php
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@ -319,6 +319,33 @@ class Group extends DataObject {
$this->setField("Code",SiteTree::generateURLSegment($val));
}
public function validate() {
$result = parent::validate();
// Check if the new group hierarchy would add certain "privileged permissions",
// and require an admin to perform this change in case it does.
// This prevents "sub-admin" users with group editing permissions to increase their privileges.
if($this->ParentID && !Permission::check('ADMIN')) {
$ancestorIds = $this->Parent()->collateAncestorIDs();
$inheritedPermissions = DataObject::get(
'Permission',
sprintf('"GroupID" IN (%s)', implode(',', array_map('intval', $ancestorIds)))
);
$inheritedCodes = $inheritedPermissions ? $inheritedPermissions->column('Code') : array();
if(array_intersect($inheritedCodes, Permission::$privileged_permissions)) {
$result->error(sprintf(
_t(
'Group.HierarchyPermsError',
'Can\'t assign parent group "%s" with privileged permissions (requires ADMIN access)'
),
$this->Parent()->Title
));
}
}
return $result;
}
function onBeforeWrite() {
parent::onBeforeWrite();

11
security/Permission.php
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@ -90,6 +90,17 @@ class Permission extends DataObject {
*/
static $hidden_permissions = array();
/**
* @config These permissions can only be applied by ADMIN users, to prevent
* privilege escalation on group assignments and inheritance.
* @var array
*/
static $privileged_permissions = array(
'ADMIN',
'APPLY_ROLES',
'EDIT_PERMISSIONS'
);
/**
* Check that the current member has the given permission.
*

48
tests/security/GroupTest.php
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@ -86,6 +86,54 @@ class GroupTest extends FunctionalTest {
$this->assertNull(DataObject::get('Group', "\"ID\"={$adminGroup->ID}"), 'Group is removed');
$this->assertNull(DataObject::get('Permission',"\"GroupID\"={$adminGroup->ID}"), 'Permissions removed along with the group');
}
public function testValidatesPrivilegeLevelOfParent() {
if(!class_exists('ReflectionMethod')) {
$this->markTestSkipped('Test requires PHP 5.3 Reflection API');
}
$nonAdminUser = $this->objFromFixture('GroupTest_Member', 'childgroupuser');
$adminUser = $this->objFromFixture('GroupTest_Member', 'admin');
$nonAdminGroup = $this->objFromFixture('Group', 'childgroup');
$adminGroup = $this->objFromFixture('Group', 'admingroup');
$nonAdminValidateMethod = new ReflectionMethod($nonAdminGroup, 'validate');
$nonAdminValidateMethod->setAccessible(true);
// Making admin group parent of a non-admin group, effectively expanding is privileges
$nonAdminGroup->ParentID = $adminGroup->ID;
$this->logInWithPermission('APPLY_ROLES');
$result = $nonAdminValidateMethod->invoke($nonAdminGroup);
$this->assertFalse(
$result->valid(),
'Members with only APPLY_ROLES can\'t assign parent groups with direct ADMIN permissions'
);
$this->logInWithPermission('ADMIN');
$result = $nonAdminValidateMethod->invoke($nonAdminGroup);
$this->assertTrue(
$result->valid(),
'Members with ADMIN can assign parent groups with direct ADMIN permissions'
);
$nonAdminGroup->write();
$newlyAdminGroup = $nonAdminGroup;
$this->logInWithPermission('ADMIN');
$inheritedAdminGroup = $this->objFromFixture('Group', 'group1');
$inheritedAdminMethod = new ReflectionMethod($inheritedAdminGroup, 'validate');
$inheritedAdminMethod->setAccessible(true);
$inheritedAdminGroup->ParentID = $adminGroup->ID;
$inheritedAdminGroup->write(); // only works with ADMIN login
$this->logInWithPermission('APPLY_ROLES');
$result = $inheritedAdminMethod->invoke($nonAdminGroup);
$this->assertFalse(
$result->valid(),
'Members with only APPLY_ROLES can\'t assign parent groups with inherited ADMIN permission'
);
}
}
class GroupTest_Member extends Member implements TestOnly {