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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: security modelThe subject is certainly interesting. The security chapters (login and appendix) are getting a fresh a look. I assume that this is all WG will want to do for the first version of iSCSI. Integration in Storage Service Provider architecture is certainly important and and will continue to be handled after the first release. Is this work related to Ocean Store? Julo Dave Nagle <bassoon@yogi.ece.cmu.edu> on 01/09/2000 16:38:11 Please respond to Dave Nagle <bassoon@yogi.ece.cmu.edu> To: ips@ece.cmu.edu cc: (bcc: Julian Satran/Haifa/IBM) Subject: security model From: Banu Ozden & Mike Reiter We suggest the attached extensions to the security model proposed in the iSCSI draft (Section 6). The existing iSCSI security model covers "communication security" between an initiator and a target. It does not address "data security". Data security provides protection against possible attacks to the data stored at the target. These include threats like unauthorized disclosure of data at the target to administrators or other clients of the target, and unauthorized modification of data at the target. Our main motivation is to enhance the security model for storage outsourcing environments where the Storage Service Provider (SSP) personnel is not necessarily trusted or where the sharing of target between different customers of the SSP raises a security concern. We are working on a security architecture for storage outsourcing. We would like to know whether there is interest on including data security considerations to iSCSI in addition to communication security. Banu Ozden & Mike Reiter Bell Labs 600 Mountain Ave. Murray Hill, NJ 07974 http://www.bell-labs.com/who/ozden http://www.bell-labs.com/who/reiter _______________________________________________________________ Threat Model T1. Disclosure of message contents to an eavesdropper intercepting communication between an initiator and a target. T2. An attacker masquerading as the initiator to a target or the target to an initiator. This includes an attacker manipulating communication between an initiator and a target, e.g., to introduce false messages, modify passing messages, or delete messages. T3. Disclosure of data to personnel maintaining the target or to other customers of the target. T4. The modification of data by the target or other customers of the target. Security Model 1. No Security (same as described in the iSCSI draft) This mode does not authenticate nor does it encrypt data. This mode should be used in environments where there is minimal security risk and little chance for configuration errors. 2. Entity Authentication (referred to as End-to-End Authentication in the iSCSI draft) The initiator's and/or target's identity is authenticated. Once the client is authenticated, all messages are sent and received in the clear. This mode should only be used when there is minimal risk to man-in-the-middle attacks, eavesdropping, message insertion, deletion, and modification. 3. Message Integrity (new) This mode protects against T2 types of threats. It provides communication integrity. 4. Message Integrity Combined with Encryption (referred to as Encryption in the iSCSI draft) This mode protects against threats T1 and T2. Thus, it provides communication integrity and communication privacy. It protects against man-in-the-middle attacks, eavesdropping, message insertion, deletion, and modification. 5. Data Privacy (new) This mode protects against T3 types of threats. The initiator encrypts/decrypts data. The target stores encrypted data. 6. Data Privacy with Data Integrity This mode protects against threats T3 and T4. 7. Some combinations of the above security options For example, data privacy with message authentication (5 & 3) protects against threats T1, T2 and T3.
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