Page 1 NTFS and Share Permissions Lecture 6 Hassan Shuja 10/26/2004

Page 2 NTFS and Share Permissions File and Folder Attributes – Archive – Compress (NTFS Only) – Encrypt (NTFS Only) – Hidden – Index (NTFS only) – Read-Only

Page 3 NTFS and Share Permissions Folder Sharing – Sharing is used to provide access to a folder across a network from one computer to another – Share permissions are applied to folders, and not to specific files – All files and subfolders within a shared folder are shared with the same permission – This is the only way to secure files on a FAT volume – Permissions can be set using “allow” and “deny” – Deny permission always cancels out corresponding allow permissions – Shared folder status of “shared” is discarded when a folder is moved or on the copy of the folder

Page 4 NTFS and Share Permissions Creating a Share – In a domain environment members of the built-in group ‘administrator’ and ‘Server operators’ can create a share on any domain controller – Members of the ‘administrator’ and ‘power users’ groups have authority to share any folder on a non-domain controller – Members of the ‘domain admins’ built-in global group have ability to share folders on any Windows 2000 computers in the domain – Keep in mind the length of name that is given to the share – MS-DOS can read only 8 characters – Windows 95&98 can read only 12 characters – Windows NT&W2K can read up to 80 characters – Hidden Shares are created for all volumes of the hard-disk and for the folder where W2K is installed – Hidden Shares can only be accessed by the members of the administrator group – To make a share hidden just add a ‘$’ at the end of the share name – For example – C$ or D$ for volumes or Admin$ for folder where W2K is installed

Page 5 NTFS and Share Permissions Accessing a Share – Once a share has been created, clients can connect to it using various different methods – Map a network drive – Use My Network Places to browse – Use the Run menu option by identifying the correct UNC path – UNC - \\server_name\share_name\\server_name\share_name – FQDN – server_name.domain_name.root_domain_name\share_name

Page 6 NTFS and Share Permissions Shared Folder Permissions – Permissions determine which users/groups have access to the folder and what kind of access – Only apply when a user is connecting to a share over the network and NOT to the locally logged in user – Only access control that can be applied for FAT volumes – Types of permissions – Read – Open Files and see subfolders – Change – Read permission and edit/delete/create files and folders – Full Control – Change permissions and take ownership and modify permissions – Combining Permissions – When a user belongs to more than one group, the least restrictive permission takes precedence – Except when there is a ‘deny’ permission. Deny overrides any allow.

Page 7 NTFS and Share Permissions NTFS Permissions – Permissions effect all files and folders on NTFS formatted volume/partition – NTFS Permissions can be applied to both files and folders – NTFS Permissions apply to both local and network users – Inheritance plays a role when permissions are applied to folders – Inheritance can be blocked – NTFS Permissions can be assigned by an owner, a user with Full Control, or a user with Change permission – A user with take ownership permission can take ownership and change permissions – Ownership does not change by simply editing the file – An owner by default has full control permission

Page 8 NTFS and Share Permissions NTFS Permissions – NTFS Permissions are specified in the object’s ACL – Two categories of permissions; Standard and Special – Standard permissions are frequently used permissions for objects – Read, Read&Execute, List Folder Contents, Write, Modify, and Full Control – Special Permissions provide a much finer granularity for security – Also called Advanced Permissions

Page 9 NTFS and Share Permissions

Page 10 NTFS and Share Permissions

Page 11 NTFS and Share Permissions NTFS Permissions for New/Moved/Copied Files and Folders – A New file or subfolder is created – It inherits the NTFS permissions of the parent folder – Moving or coping a file or folder to a different volume – It inherits the NTFS permissions of the destination folder – Coping a file or folder on the same volume – It inherits the NTFS permissions of the destination folder – Moving a file or folder on the same volume – All original NTFS permissions are retained

Page 12 NTFS and Share Permissions Combining of NTFS Permissions – When a user belongs to multiple groups that have permissions, the least restrictive permission wins – Unless there is a deny in one of those permissions. A deny overrides any allows

Page 13 NTFS and Share Permissions Effective Permissions – When NTFS and Share Permissions are combined the MOST restrictive permission becomes the users effective permission – Choice the least restrictive share permission – Choice the least restrictive NTFS permission – Combine these two and select the MOST restrictive permission

Page 14 NTFS and Share Permissions Disk Quotas – Set on NTFS volumes – It tracks and restricts space usage on the whole volume for users – This feature needs to be enabled and is not set by default – Disk Quota warnings ca be recorded in the Event log