SECURITY SUMMIT 06/06/2013 Roma STORAGE FORENSICS. Litiano Piccin (NCDA-NCIE/SAN)

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1 SECURITY SUMMIT 06/06/2013 Roma STORAGE FORENSICS Litiano Piccin (NCDA-NCIE/SAN)

2 1. Introduction: SAN vs NAS. 2. SAN. 3. NAS. 4. SNAPSHOT. 5. Data Acquisition.

3 INTRODUCTION

4 STORAGE: SAN vs NAS Storage area network. A storage area network (SAN) is a dedicated network that provides access to consolidated, block level data storage. SANs are primarily used to make storage devices, such as disk arrays, tape libraries, and optical jukeboxes, accessible to servers so that the devices appear like locally attached devices to the operating system. A SAN typically has its own network of storage devices that are generally not accessible through the local area network by other devices. Network attached storage. Network-attached storage (NAS) is file-level computer data storage connected to a computer network providing data access to heterogeneous group of clients. NAS not only operates as a file server, but is specialized for this task either by its hardware, software, or configuration of those elements. NAS is often manufactured as a computer appliance a specialized computer built from the ground up for storing and serving files rather than simply a general purpose computer being used for the role.

5 STORAGE: SAN vs NAS

6 STORAGE: SAN vs NAS SAN: High Performance in a separated network. Scalability. Reliability: more fabric can guarantee the backup/mirror of the network. Safety: with SWITCH/STORAGE ZONING eliminates the possibility of unapproved access. NAS: Low cost and easiness to maintain. Easily multiplatform access. With 10GE connectivity, NAS devices can offer performance on par with many SANs. Recently many customers are expanding the use of NAS to include storage for relational databases such as Oracle and MySQL, server virtualization environments such as VMWare VSphere, and virtual desktop solutions.

7 SAN

8 SAN (STORAGE AREA NETWORK) LUN In computer storage, a logical unit number, or LUN, is a number used to identify a logical unit, which is a device addressed by the SCSI protocol or protocols which encapsulate SCSI, such as Fibre Channel or iscsi. A LUN may be used with any device which supports read/write operations, such as a tape drive, but is most often used to refer to a logical disk as created on a SAN. Though not technically correct, the term "LUN" is often also used to refer to the logical disk itself. SCSI Small Computer System Interface (SCSI) is a set of standards for physically connecting and transferring data between computers and peripheral devices. The SCSI standards define commands, protocols and electrical and optical interfaces. SCSI is most commonly used for hard disks and tape drives, but it can connect a wide range of other devices, including scanners and CD drives, although not all controllers can handle all devices.

9 SAN (STORAGE AREA NETWORK) FC Fibre Channel, or FC, is a high-speed network technology (commonly running at 2-, 4-, 8- and 16-gigabit speeds) primarily used for storage networking. Fibre Channel is standardized in the T11 Technical Committee of the International Committee for Information Technology Standards (INCITS), an American National Standards Institute (ANSI)-accredited standards committee. Fibre Channel was primarily used in the supercomputer field, but has now become the standard connection type for storage area networks (SAN) enterprise storage. Despite its name, Fibre Channel signaling can run on twisted pair copper wire in addition to fiber-optic cables.. iscsi In computing, iscsi, is an abbreviation of Internet Small Computer System Interface, an Internet Protocol (IP)-based storage networking standard for linking data storage facilities. By carrying SCSI commands over IP networks, iscsi is used to facilitate data transfers over intranets and to manage storage over long distances. iscsi can be used to transmit data over local area networks (LANs), wide area networks (WANs), or the Internet and can enable location-independent data storage and retrieval. The protocol allows clients (called initiators) to send SCSI commands (CDBs) to SCSI storage devices (called targets) on remote servers.

10 SAN (STORAGE AREA NETWORK) FC SWITCH In the computer storage field, a Fibre Channel switch is a network switch compatible with the Fibre Channel (FC) protocol. It allows the creation of a Fibre Channel fabric, that is currently the core component of most storage area networks (SAN). The fabric is a network of Fibre Channel devices which allows many-to-many communication, device name lookup, security, and redundancy. FC switches implement zoning, a mechanism that disables unwanted traffic between certain fabric nodes.

11 SAN (STORAGE AREA NETWORK)

12 NAS

13 NAS (NETWORK ATTACHED STORAGE) NFS Network File System (NFS) is a distributed file system protocol originally developed by Sun Microsystems in 1984, allowing a user on a client computer to access files over a network in a manner similar to how local storage is accessed. NFS, like many other protocols, builds on the Open Network Computing Remote Procedure Call (ONC RPC) system. CIFS In computer networking, Server Message Block (SMB), also known as Common Internet File System (CIFS) operates as an application-layer network protocol mainly used for providing shared access to files, printers, serial ports, and miscellaneous communications between nodes on a network. It also provides an authenticated inter process communication mechanism.

14 SNAPSHOT

15 SNAPSHOT What is a snapshot? In general terms, a snapshot is a locally retained, read-only, point-in-time virtual copy of a file system or volume. Most snapshots are time-and spaceefficient. When properly implemented, they ll enable faster operational recovery (OR) and help meet tighter recovery point objectives (RPOs), recovery time objectives (RTOs) and service level agreements (SLAs). Snapshots are not a replacement for backups but can be foundational to implementing a solid backup strategy. Research conducted by International Data Corporation (IDC) shows that enterprises are increasingly relying on disk base backup/restore software to meet their shrinking backup windows and meet application availability requirements. Interestingly, 46% of backup and restore implementations are disk based followed by tape at 38% (according to IDC), which is a dramatic change from the past. This change indicates the necessity of understanding the options the capabilities and limitations of the different snapshot implementations.

16 SNAPSHOT Two Type of Snapshot: Copy on write (COW): the allocation block are copy before to be overwritten. Redirect on write (RoW): the write request is redirect to new allocation block (NETAPP). COW Low Performance RoW More Fragmentation

17 SNAPSHOT: COW

18 SNAPSHOT: RoW

19 DATA ACQUISITION

20 DATA ACQUISITION The process of data acquisition must preseve: INTEGRITY DISCRETION AVAILABILITY 1) Freeze the evidence: SNAPSHOT 2) Copy the evidence in another Storage OR Clone the evidence. 3) Acquire the Evidence (LUN, CIFS SHARE, EXPORT NFS)

21 FREEZE THE EVIDENCE: SNAPSHOT The SNAPSHOT process is instantaneously and not require VOLUME modification. Before to execute the command check the volume size and the free space. A SNAPSHOT can increase very easily when there are a lots of file modifications (DB REORG/REBUILD).

22 COPY THE EVIDENCE MIRROR is a process that require TCP/IP connectivity. All the command are execute on the DESTINATION STORAGE (except if the destination is in the same STORAGE). The MIRROR process copy all source block in a destination volume that must have the same or major size of the source. The time required depends of the size of source and the TCP/IP connection. Commercial Solutions: NetApp: SnapMirror EMC: RecoverPoint IBM: Global Mirror

23 CLONE THE EVIDENCE With The CLONE Technology you can create a clone of different object: LUN, FILE or VOLUME. The best practise to preserve the integrity of a evidence is the VOLUME CLONE. The process of VOLUME CLONE depends to the size of the SOURCE VOLUME. The CLONE VOLUME will be create in the same STORAGE.

24 ACQUIRE THE EVIDENCE: LUN In a VOLUME CLONE process all data are replicated in read/write mode. All CLONED LUN have a different SIGNATURE from SOURCE LUN for access protection purpose. After the process all LUN are ONLINE but without INITIATOR CONFIGURED. The first step is to configure the INITIATOR of the LUN with the WWN of the FORENSICS WORKSTATION. Notice that a LUN can t be READONLY.

25 ACQUIRE THE EVIDENCE: LUN INITIATOR HOST

26 ACQUIRE THE EVIDENCE: CIFS SHARE When you define a share you can assign the CIFS SHARE SECURITY. This attribute don t change the METADATA of the FILES in the VOLUME. In the CLONE VOLUME you can assign the CIFS SECURITY: Everyone / Read CIFS SHARE SECURITY

27 ACQUIRE THE EVIDENCE: EXPORT NFS When you define an NFS EXPORT you can decide to put the mount in READONLY access and only to a determinate host.

28 SECURITY SUMMIT 06/06/2013 ROMA

29 Twitter: Web: Tanzania 2008 (Ismani - Iringa)

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