Sec-ALG: An Open-source Application Layer Gateway for Secure Access to Private Networks

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Volume Title

A4 Artikkeli konferenssijulkaisussa

Date

2020-08

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Language

en

Pages

11

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Proceedings of the 29th International Conference on Computer Communications and Networks, ICCCN 2020, Proceedings : International Conference on Computer Communications and Networks

Abstract

Middleboxes such as Network Address Translators (NATs), proxy servers or Application Layer Gateways (ALGs) provide remote access to end-hosts in the private address space. The middleboxes offer proprietary solutions and encrypted traffic poses a challenge when middleboxes employ packet payload inspection techniques for connection establishment. Session key sharing and decryption followed by re-encryption of the traffic, for correctly routing to the private host, increases the connection latency and also poses a higher threat in case of traffic interception by a malicious third-party.In this paper, we present a novel open-source ALG, called Sec-ALG, for providing secure end-to-end communication to the web servers situated in the private address space. Sec-ALG relies on the technique of light Deep Packet Inspection (DPI) for protocol detection and session establishment using a novel parser-lexer generator called YaLe. The proposed approach offers increased security by maintaining end-to-end encryption for an HTTPS connection. Our experimental analysis demonstrates that Sec-ALG reduces the HTTPS connection latency in comparison to the NGINX reverse proxy using a 24-core host machine. Moreover, Sec-ALG handles requests at a three-fold increased rate than NGINX proxy when tested with 100 concurrent connections. The ALG can be used either as a standalone solution or a component of the Realm Gateway, that is a generic interworking solution between public and private networks. The presented work is part of an extensive ongoing research at Aalto University focusing on embedding policy based trust into the network.

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Keywords

Middleboxes, Protocols, Logic gates, Cryptography, Web servers

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Citation

Riaz, M, Tilli, J-M & Kantola, R 2020, Sec-ALG : An Open-source Application Layer Gateway for Secure Access to Private Networks . in Proceedings of the 29th International Conference on Computer Communications and Networks, ICCCN 2020 ., 9209718, Proceedings : International Conference on Computer Communications and Networks, IEEE, International Conference on Computer Communications and Networks, Honolulu, Hawaii, United States, 03/08/2020 . https://doi.org/10.1109/ICCCN49398.2020.9209718