Application: A secure Web Architecture Sample Clauses

Application: A secure Web Architecture. In the context of a project called DADDI, we have designed an architecture which provides an IDS (Intrusion Detection System) component in charge of detecting intrusions in an infor- mation system by comparing the outputs delivered by several diverse Web servers [29, 54]. The architecture (see Figure 6.7) is organized as follows. A proxy handles the clients’ re- quests. It forwards the requests received from a client to the Web servers and later forwards the response received from the IDS to this client. It ensures that the Web servers receive the same sequence of requests and thus evolve consistently. In this approach, the idea is to take advantage of the existing software and hardware diversity: as the Web servers have been designed and developed independently, they do not exhibit the same vulnerabilities. If we assume that a malicious payload contained in a Web request cannot take advantage of two different vulnerabilities, then an intrusion may occur in only one Web server at a time. In this case, as the other Web servers are not exhibiting the same vulnerability, they are not affected by the attack and they all provide a same response that is supposed to be different from the response provided by the corrupted Web server. The IDS is in charge of comparing the responses returned by the servers. To select the response that has to be sent back to the client, it uses a majority voting algorithm. If it detects some differences among the responses, it raises an alarm. We showed in [29] that this solution guarantees confidentiality and integrity. Availability is partially offered at the server level thanks to the set of diverse Web servers. To enhance availability, it is also necessary to replicate the reverse proxy/IDS and hence to form a group of reverse proxies. To ensure that the group of reverse proxies/IDS evolve consistently, despite the occurrence of failures, an atomic broadcast service has to be used. This atomic broadcast service relies upon a consensus protocol to order the requests. Figure 6.7: Architecture of the secure web-server. Among the members of the group, a leader is elected. It is in charge of broadcasting the requests to the set of diverse Web servers. In [29], we proposed a solution in which each request to be submitted to the Web servers is only addressed to the leader of the group of reverse proxies. In this particular approach, the leader is the unique member of the group to propose value and hence the RO optimization is effective...
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