iscsi Security ELEN 689 Network Security John Price Peter Rega
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1 iscsi Security ELEN 689 Network Security John Price Peter Rega
2 Outline iscsi Basics iscsi and NAS Differences iscsi Security Current Vulnerabilities References
3 iscsi Basics Internet Small Computer Storage Interconnect The iscsi protocol is a mapping of the SCSI remote procedure invocation model over the TCP protocol Two approaches to iscsi implementations: iscsi Appliance and iscsi Gateway Enables the transfer of Block I/O data over an IP network Operates on top of TCP through encapsulation of SCSI commands in the TCP/IP datastream NAS and iscsi Technology Overview, Storage Networking Industry Association, 2006
4 iscsi Packets (PDU) IP Storage Protocols: iscsi, Storage Networking Industry Association, 2006
5 PDU Structure BHS is the only required segment in the PDU All segments and digests are padded to the closest integer number of four byte words All multi-byte integers are big-endian Internet Small Computer Systems Interface (iscsi), RFC 3720
6 Basic Header Segment BHS is always 48 bytes long The opcode and the DataSegmentLength are ALWAYS in the BHS 2 categories of opcodes: initiator and target When used, the Initiator Task Tag and LUN must always be in the same location Internet Small Computer Systems Interface (iscsi), RFC 3720
7 iscsi Layer Model IP Storage Protocols: iscsi, Storage Networking Industry Association, 2006
8 iscsi Sessions Sessions can be thought of as a scsi port attached to one or more TCP/IP connection Login phase always begins a session Sessions guarantee SCSI commands delivered in order Can recover from lost connections IP Storage Protocols: iscsi, Storage Networking Industry Association, 2006
9 iscsi Integrity iscsi adds a cyclic redundancy check (CRC- 32C) along with TCP/IP checksum and Ethernet level CRCs CRC check word is called a digest Header digest and data digest are optional to use in the PDU (MUST be used to fully comply with spec) The Digests insure correct operation, data placement, and data is unmodified
10 TCP Overhead Every TCP connection has processing overhead potential: Connection setup/teardown Window management Congestion control TCP Segmentation IP Fragmentation Checksum calculations TOEs are helpful but not required for iscsi Therefore, iscsi is currently used for entry level to mid size servers High end implementations would require Gigabit Ethernet and TOE
11 iscsi vs. NAS NAS and iscsi Technology Overview, Storage Networking Industry Association, 2006
12 iscsi vs. NAS IP Storage Protocols: iscsi, Storage Networking Industry Association, 2006
13 iscsi Security Considerations Must prevent against active (man in the middle, masquerading) and passive (snooping) attacks. iscsi protocol allows for configuration without any security measures Use only in extreme cases/closed environments
14 Phases of iscsi security In-band Initiator-Target Authentication Initial series of connection login packets exchanged between the target and initiator. Security here exists at the iscsi connection level. Targets and Initiators are not required by spec to authenticate each other. Unable to assure secure IP level communications, so care must be taken.
15 In-band Initiator-Target Authentication In-band authentication only assures users of correct endpoints. If an underlying security mechanism is not used (Ipsec) then all packets are sent in plain text. Only assures initiators that they have connected to a trusted target, and vice-versa.
16 Methods of In-band Authentication
17 IP Layer Security iscsi uses IPsec for packet level (IP level) protection. IPsec provides: Cryptographic integrity Authentication Confidentiality If multiple devices are used, then the combined device is considered the iscsi device
18 iscsi and IPsec Data authentication and integrity is provided by a cryptographic Message Authentication Code (MAC) Types of MAC s Unconditionally secure (one time pad) Hash-fuction based Stream cipher-based Block cipher-based
19 iscsi and IPsec Any iscsi compliant device must impliment IPsec with ESP in tunnel mode May also provide IPsec in transport mode With the speeds that iscsi can operate at, a single 32 bit number (used as the SA in IPsec) could cycle very fast.
20 Network Appliance Vulnerability Unauthenticated iscsi Initiators can bypass iscsi authentication on NetApp Filers by manipulating the iscsi Login Negotiation protocol. Login negotiation is in 3 phases: Security Mode: client and server verify identity Operational Mode: client and server negotiate session Full Feature Mode: client and server exchange SCSI commands Clients can force server to go to operational mode without proving identity Data stored on iscsi-mapped LUNs can be read and altered by the attacker Has been fixed by Network Appliances
21 Linux-iSCSI Vulnerability Linux iscsi implementation installs the iscsi.conf file with worldreadable permissions on some OS s, which allow local users to gain access to the cleartext CHAP password Only exploitable locally Would allow a local attacker to corrupt the password, obtain user passwords, or manipulate data
22 References Hibbard, Eric, Hitatchi Data Systems, Security 1: Storage Security - Beyond the Introduction, 2006 Storage Network Industry Association Huffard, John L., and Zamar, Ahmed, IP Storage Protocols: iscsi, 2006 Storage Network Industry Association Singer, Wolfgang, IBM Austria, NAS and iscsi Technology Overview, 2006 Storage Network Industry Association Internet Small Computer Systems Interface (iscsi), RFC 3720, SecurityFocus, Network Appliance iscsi Authentication Bypass, Linux-iSCSI Vulnerability,
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