personalized pseudonyms for servers in the cloud
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Personalized Pseudonyms for Servers in the Cloud Qiuyu Xiao - PowerPoint PPT Presentation

Nov 17, 2023 •377 likes •1.04k views

Personalized Pseudonyms for Servers in the Cloud Qiuyu Xiao (UNC-Chapel Hill) Michael K. Reiter (UNC-Chapel Hill) Yinqian Zhang (Ohio State Univ.) Ba Backg kground Servers identity is not well protected with the normal HTTPS connection.

  1. Personalized Pseudonyms for Servers in the Cloud Qiuyu Xiao (UNC-Chapel Hill) Michael K. Reiter (UNC-Chapel Hill) Yinqian Zhang (Ohio State Univ.)

  2. Ba Backg kground Server’s identity is not well protected with the normal HTTPS connection. DNS query Query name: www.example.com IP TCP Encrypted payload TLS/SSL SNI: example.com Certificate subject name: example.com Pub key: E58B2C78….. IP address: 111.111.111.111 1

  3. Ba Backg kground Server’s identity is not well protected with the normal HTTPS connection. DNS query Query name: www.example.com IP TCP Encrypted payload TLS/SSL SNI: example.com Certificate subject name: example.com Pub key: E58B2C78….. IP address: 111.111.111.111 1

  4. Ba Backg kground Real-world adversaries compromise user’s privacy. 2

  5. Ba Backg kground Real-world adversaries compromise user’s privacy. 2

  6. Ba Backg kground Real-world adversaries compromise user’s privacy. 2

  7. Ex Exis istin ing solu lutio ions VPN tunneling • - Encrypt and tunnel user’s traffic through proxy server 3

  8. Ex Exis istin ing solu lutio ions Tor • - Route encrypted packets through multiple Tor relays 4

  9. Ex Exis istin ing solu lutio ions Cloud and CDN based solutions • - CloudTransport [1] - Domain fronting [2] - CacheBrowser [3] 1. Cloud-Transport: Using cloud storage for censorship-resistant networking, PETS 2014 2. Blocking-resistant communication through domain fronting, PETS 2015 3. CacheBrowser: Bypassing Chinese censorship without proxies using cached content, CCS 2015 5

  10. Ex Exis istin ing solu lutio ions Cloud and CDN based solutions • - CloudTransport [1] non-cooperative cloud provider - Domain fronting [2] - CacheBrowser [3] 1. Cloud-Transport: Using cloud storage for censorship-resistant networking, PETS 2014 2. Blocking-resistant communication through domain fronting, PETS 2015 3. CacheBrowser: Bypassing Chinese censorship without proxies using cached content, CCS 2015 5

  11. Ex Exis istin ing solu lutio ions Cloud and CDN based solutions • - CloudTransport [1] - Domain fronting [2] - CacheBrowser [3] Domain name is visible in TLS SNI field 1. Cloud-Transport: Using cloud storage for censorship-resistant networking, PETS 2014 2. Blocking-resistant communication through domain fronting, PETS 2015 3. CacheBrowser: Bypassing Chinese censorship without proxies using cached content, CCS 2015 5

  12. Our solution Ou Personalized Pseudonym for a Server in the Cloud (PoPSiCl) DNS query Query name: www.example.com IP TCP Encrypted payload TLS/SSL SNI: example.com Certificate subject name: example.com Pub key: E58B2C78….. IP address: 111.111.111.111 6

  13. Our solution Ou Personalized Pseudonym for a Server in the Cloud (PoPSiCl) DNS query Query name: www.example.com IP TCP Encrypted payload TLS/SSL SNI: example.com Certificate subject name: example.com Pub key: E58B2C78….. IP address: 111.111.111.111 6

  14. Our solution Ou Personalized Pseudonym for a Server in the Cloud (PoPSiCl) DNS query Query name: x…x.popsicls.com IP TCP Encrypted payload TLS/SSL SNI: x…x.popsicls.com Certificate subject name: x…x.popsicls.com Pub key: AGJ46DM….. IP address: 124.132.215.121 6

  15. Our solution Ou Personalized Pseudonym for a Server in the Cloud (PoPSiCl) DNS query Query name: x…x.popsicls.com IP TCP Encrypted payload TLS/SSL SNI: x…x.popsicls.com Certificate subject name: x…x.popsicls.com Pub key: AGJ46DM….. No extra client application! IP address: 124.132.215.121 6

  16. Our solution Ou Personalized Pseudonym for a Server in the Cloud (PoPSiCl) DNS query Query name: x…x.popsicls.com No proxy! IP TCP Encrypted payload TLS/SSL SNI: x…x.popsicls.com Certificate subject name: x…x.popsicls.com Pub key: AGJ46DM….. No extra client application! IP address: 124.132.215.121 6

  17. Thr Threa eat t model del In the context of a client-server interaction … • What is trusted • Client computer • Cloud infrastructure (including the server computer) • What is not trusted • The network between the client and the cloud • Other clients and other servers 7

  18. Po PoPSiCl re registration www.example.com 8

  19. Po PoPSiCl re registration www.example.com 9

  20. Po PoPSiCl re registration VM VM VM VM DNS server VM VM PoPSiCl store Cl Cloud SDN controller 10

  21. Po PoPSiCl re registration VM VM VM VM DNS server VM VM PoPSiCl store Registration request Cl Cloud SDN controller 10

  22. Po PoPSiCl re registration PoPSiCl VM VM Pseudo IP VM VM DNS server VM VM PoPSiCl store Cl Cloud SDN controller 10

  23. PoPSiCl Po PoPSiCl re registration Pseudo IP PoPSiCl VM VM Tenant server ID VM VM DNS server VM VM PoPSiCl store Cl Cloud SDN controller 10

  24. PoPSiCl Po PoPSiCl re registration Pseudo IP Client Cert Server Cert VM VM Client PriKey Server PriKey VM VM DNS server VM VM PoPSiCl PoPSiCl store Tenant server ID Cl Cloud SDN controller 10

  25. PoPSiCl Po PoPSiCl re registration Pseudo IP Sign Cloud PriKey Client Cert Server Cert VM VM Client PriKey Server PriKey VM VM DNS server VM VM PoPSiCl PoPSiCl store Tenant server ID Cl Cloud SDN controller 10

  26. PoPSiCl Po PoPSiCl re registration Pseudo IP Sign Server PriKey Client Cert Server Cert VM VM Client PriKey VM VM DNS server VM VM PoPSiCl PoPSiCl store Tenant server ID Cl Cloud SDN controller 10

  27. PoPSiCl Po PoPSiCl re registration Pseudo IP PoPSiCl PoPSiCl Client Cert Server Cert VM VM Client PriKey Server PriKey VM VM DNS server VM VM PoPSiCl PoPSiCl store Tenant server ID Cl Cloud SDN controller 10

  28. PoPSiCl PoPSiCl Po PoPSiCl re registration Server Cert Pseudo IP PoPSiCl Server PriKey Client Cert VM VM Client PriKey VM VM DNS server VM VM PoPSiCl PoPSiCl store Tenant server ID Cl Cloud SDN controller 10

  29. PoPSiCl PoPSiCl Po PoPSiCl re registration Server Cert Pseudo IP Server PriKey PoPSiCl VM VM VM VM DNS server Client Cert VM VM PoPSiCl Client PriKey PoPSiCl store Tenant server ID Cl Cloud SDN controller 10

  30. PoPSiCl Pseudo IP Po PoPSiCl ac access ss VM VM VM VM VM VM DNS server PoPSiCl Server Cert PoPSiCl Server PriKey Client Cert Client PriKey SDN switch PoPSiCl Tenant server ID Cl Cloud 11 SDN controller

  31. PoPSiCl Pseudo IP Po PoPSiCl ac access ss VM VM VM VM VM VM (1) DNS query: DNS server PoPSiCl PoPSiCl Server Cert PoPSiCl Server PriKey Client Cert Client PriKey SDN switch PoPSiCl Tenant server ID Cl Cloud 11 SDN controller

  32. PoPSiCl Pseudo IP Po PoPSiCl ac access ss VM VM VM VM VM VM (1) DNS query: DNS server PoPSiCl PoPSiCl Server Cert PoPSiCl (2) DNS response: Server PriKey Client Cert Pseudo IP Client PriKey SDN switch PoPSiCl Tenant server ID Cl Cloud 11 SDN controller

  33. PoPSiCl Pseudo IP Po PoPSiCl ac access ss VM VM VM VM VM VM (1) DNS query: DNS server PoPSiCl PoPSiCl Server Cert PoPSiCl (2) DNS response: Server PriKey Client Cert Pseudo IP Client PriKey (3) Pseudo IP SDN switch PoPSiCl Tenant server ID Cl Cloud 11 SDN controller

  34. PoPSiCl Pseudo IP Po PoPSiCl ac access ss VM VM VM VM VM VM (1) DNS query: DNS server PoPSiCl PoPSiCl Server Cert PoPSiCl (2) DNS response: Server PriKey Client Cert Pseudo IP Client PriKey (3) Pseudo IP SDN switch (4) Forward PoPSiCl Tenant server ID Cl Cloud 11 SDN controller

  35. PoPSiCl Pseudo IP Po PoPSiCl ac access ss VM VM VM VM VM VM (1) DNS query: DNS server PoPSiCl PoPSiCl Server Cert PoPSiCl (2) DNS response: Server PriKey Client Cert Pseudo IP Client PriKey (3) Pseudo IP SDN switch (4) Forward PoPSiCl (5) Establish TCP Tenant server ID Cl Cloud (via SDN switch) 11 SDN controller

  36. PoPSiCl Pseudo IP Po PoPSiCl ac access ss VM VM VM VM VM VM (1) DNS query: DNS server PoPSiCl PoPSiCl Server Cert PoPSiCl (2) DNS response: Server PriKey Client Cert Pseudo IP Client PriKey Get PoPSiCl from the SNI field (3) Pseudo IP SDN switch (4) Forward in TLS ClientHello message. PoPSiCl (5) Establish TCP Tenant server ID Cl Cloud (via SDN switch) 11 SDN controller

  37. PoPSiCl Pseudo IP Po PoPSiCl ac access ss VM VM VM VM VM VM (1) DNS query: DNS server PoPSiCl PoPSiCl Server Cert PoPSiCl (2) DNS response: Server PriKey Client Cert Pseudo IP Client PriKey (3) Pseudo IP SDN switch (4) Forward (6) Rule update PoPSiCl (5) Establish TCP Tenant server ID Cl Cloud (via SDN switch) 11 SDN controller

  38. PoPSiCl Pseudo IP Po PoPSiCl ac access ss VM VM VM VM MATCH ACTION VM VM Source IP Source port Destination IP Destination port Client-IP Client-port Pseudo-IP Server-port Drop (1) DNS query: Tenant-IP Server-port Client-IP Client-port Change source IP to Pseudo-IP DNS server PoPSiCl PoPSiCl Server Cert PoPSiCl (2) DNS response: Server PriKey Client Cert Pseudo IP Client PriKey (3) Pseudo IP SDN switch (4) Forward (6) Rule update PoPSiCl (5) Establish TCP Tenant server ID Cl Cloud (via SDN switch) 11 SDN controller

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