distributed-firewall - Implementing a Distributed Firewall...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Implementing a Distributed Firewall Sotiris Ioannidis Univ. of Pennsylvania Angelos D. Keromytis Univ. of Pennsylvania Steve M. Bellovin AT&T Labs -- Research Jonathan M. Smith Univ. of Pennsylvania sotiris@dsl.cis.upenn.edu adk@adk.gr smb@research.att.com jms@cis.upenn.edu ABSTRACT ҹ ֹ Ӹ ݸ ع ׸ ݸ ׸ ׸ ׸ ׺ ݺ ݸ ع ׺ ָ ݸ ݸ Ѻ ׵ ֹ и ׸ и ׸ ٹ ҹ ҹ ׺ ع ׵ ָ ѹ ׸ и й ׺ ׺ ҹ ׸ ׸ ع ݸ ׳ ݺ ۸ General Terms Keywords ׸ и ٹ ݸ ظ ׸ ȸ 1. INTRODUCTION ׸ ׸ ȼ ظ Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. CCS '00, Athens, Greece. Copyright 2000 ACM 1-58113-203-4/00/0011 ..5.00 Ҭ ݸ Ҹ ݸ Ҹ غ ظ ݺ 190 ֳ غ ׸ ׸ й ӹ ׺ ׸ к ҹ ׸ عӹ ָ ׵ ѹ Һ ظ ݸ ׺ ӹ ӹ ׺ ݸ ֹ ҹ ׺ ׺ к غ ѹ ׸ ׸ ӹ ݺ ׸ й ݺ ׸ ݺ ݿ ׵ ظ ع ݹ ׺ ׸ к ׸ ׸ ׸ ׺ ׺ ظ ׸ ݺ и ع Ѹ ҹ ׺ Һ ׸ ׺ Һ ֹ ݸ ׹ ָ ݸ е Ҹ ׹ Ҹ ׵ Ӻ ֹ и е г ׸ ظ ׸ Ѹ ݺ ӫ Һ ׸ ظ ָ ҹ ݸ ȹ ݺ Ҹ ׸ ֹ ׺ 1.1 Paper Organization ׺ ع Ѹ ҹ и غ ׺ ݹ ׺ Ѹ ׺ ָ ׹ ظ ۺ 191 ׸ ֺ Request, Key, Sig Verifier Requester Gather information local policy (remote credentials) Give response 2. THE DISTRIBUTED FIREWALL и ݸ ׺ ׸ ݸ ׸ غ й Ҹ ݸ и ׹ ׺ ׸ ݳ ڹ ׺ ҹ ֹ ҳ ݺ ݸ ׸ ׸ и Ѹ ع Ѹ Ѹ ֻ Һ Ҹ ҹ Ĺ Ѻ غ ݸ ѹ ӹ ݺ Ҹ Pass information KeyNote Evaluate ҹ и ׺ Һ Ҹ ݸ ׺ ׺ ݸ ص ۸ ׺ ҹ ݺ ݸ ص ݹ ׸ ׸ ׸ й ׵ 3. KEYNOTE ڹ Ѹ Ҹ к ׸ ѹ ֹ ׺ ع ҹ ׵ ׸ ׸ ׸ غ ֵ ׺ ӹ к ָ ֹ ֵ Ҹ ׸ ׸ ׺ ׸ й ֺ ѹ ָ и ָ 192 ݸ ݸ ׸ ص ׺ к ݵ ׸ ׺ ׵ ׺ ׺ غ ׸ ָ ݸ Ҹ й ׸ ׸ ظ ع ׵ Թ غ ҹ Һ ݸ ص ׹ ظ ׵ غ ҹ ҹ ׵ Թ ׸ غ ظ й ҵ ݹ ׺ Ӹ ٹ Ҹ ظ Һ ׵ ׺ ׺ ݸ ֺ ظ ׺ ׸ ҹ ׸ Ҹ ҹ ׺ ݸ ֹ ׸ ˹ ش ׵ и ׺ ָ к Ҹ ظ ׹ ݺ ݸ ܺ ׸ ָ Ѻ ظ ݸ غ ׺ 193 Һ Թ Application Policy Daemon ׹ ׺ ӹ ظ غ ׹ ֹ غ ҵ ҵ ׺ ҹ ݸ ݹ ׺ ֹ ֹ ׺ ֹ ׸ ׸ ׸ ҹ ӫ Library accept()/connect() User Space Modified Policy System Calls Context Q Kernel Space open(), close(), read(), write(), ioctl() /dev/policy ҹ Ѹ ׺ ׹ ׸ ش ش ׺ Ѹ ׺ ݸ ֺ ҹ и ظ ҹ ع Ҹ Һ 4.1 Kernel Extensions ׺ ׸ ش ش ݺ ׸ ֺ к ׺ ׸ ѹ ָ ݸ ҹ Ѻ к ӹ ׸ й к ׺ 4. IMPLEMENTATION ҹ й ĸ ָ ׺ ׸ ׸ ׸ ׸ ָ ӹ 194 Application Modified Library Accept/Connect User Space Kernel Space ش ݺ ӫ ݸ ٫ ׸ ݺ ش ܺ ׹ ׺ ݸ ش ش ش ֹ и Һ Һ غ ش Ҹ ظ غ Ҹ ܹ ָ ݺ غ ׸ ݺ Һ ش и ҹ ׺ ظ ش غ Һ Һ ׺ ָ ڻ ݸ й Ҹ к Ҵ д ֹ ݸ к ڻ ݸ ҹ ׺ ش ش Һ к и ݺ ҹ и Ժ Ҹ ݸ д ׸ Һ 4.3 Policy Daemon Һ ׸ и ׺ ׸ ݺ Ҹ ׺ ׸ ֹ ָ ݸ غ ҹ е Һ ׸ ֹ ׸ ׺ ָ Ҹ 4.2 Policy Device Ҹ 195 ؿ ش ش ش ش ص ִ ش ش Һ Ѻ Һ ؿ ؿ ؿ ؿ ѹ ظ Ӹ ֹ ظ ׸ ׺ ֺ ׸ Ѻ ظ ĺ ׸ Ѻ ݺ ֹ Ӹ ݸ ׺ ҹ ѹ ݺ Ҹ ݸ Һ и غ и ݵ Ҹ Ҹ ݺ Ҹ ݸ ֳ س 4.4 Example Scenario ӹ и ׸ ҹ и غ 196 ָ ص ׸ ׹ ҹ к ׸ ֹ к ׵ غ 5. FUTURE WORK Ѻ ֹ ҹ غ ܹ ׺ ֹ ֺ Һ ٹ ݸ ׹ к и ׺ ֹ ֹ ظ ֹ Ҹ ȸ ع Ѻ ظ Һ ݵ Ѹ ݺ ׸ й Ѻ ӹ ѵ ׸ ܹ ݵ ڹ е ׹ ѹ ˰ ׵ ׹ ع ع غ ׺ ҹ ݺ ָ Һ ׺ к д ֹ Ҹ Ѻ ҹ ׸ ҹ ָ ҹ ֹ ظ ݺ ص Һ غ й ش к غ 197 6. RELATED WORK 7. CONCLUSION к ֺ ظ ָ ׸ ָ ݹ Ѹ е ׸ е ع ݺ и й ֺ Թ ׵ ص й ҹ ҹ ׺ ׹ ׸ ׸ ٹ й غ ҹ й к е ׸ ҹ ҹ ׺ ѹ й Ը ۸ ظ ׺ Թ к ӵ ׸ ݺ ׺ ׸ ع ݺ ָ ׸ ׵ Ҹ ݸ ݸ ׺ ָ ȵ и ظ غ ع ع ׺ ׸ ݸ ݺ ֺ ӹ ݸ ׺ ظ ӹ к ҹ к ݵ ׹ ׸ ׺ ػ ׸ ̲ ݹ Ҹ ص ҹ ׸ ׸ е ׸ Ҭ Ѻ 198 ָ й ݸ ݺ Ӹ к 9. REFERENCES ֹ к ֹ ׸ Һ й ٹ и ص ׺ й ݺ ݸ Ѻ й ̺ ׺ ߾ и ָ ú Ѹ к غ ݸ ߿ ˺ ź Һ ׺ ݸ ֽ ź º Ѹ º ׸ ׺ ݺ ߾ ź º Ѹ º ׸ ׺ ź º Ѹ º ݺ غ ݸ ߽ ׸ ׸ ź º ׸ ׺ ׺ ׸ ֹ ص ظ ۸ ݹ ׺ ׺ ݸ ص ӹ ҹ ݸ ׸ ݸ Ϻ ʺ Һ ֺ ҹ ݸ º ˺ Ȼ ׺ ظ Ժ ź Һ ׺ ׸ ݸ ̺ ظ ƺ ظ ׸ ƺ ׺ ۺ к ں ˺ ʺ Һ к ں º ĺ غ غ ߾ Ϻ ˺ Ѹ ߽ º и ʺ ź ֹ ˺ ź º к ׺ ߾ Ҹ dz Ҹ º ׺ 8. ACKNOWLEDGEMENTS ۹ ֺ ֽ Ϻ ׺ Ѹ º Һ ׸ ֹ 199 ...
View Full Document

Ask a homework question - tutors are online