Defending Computer Networks Lecture 23: Transport Layer Security. Stuart Staniford Adjunct Professor of Computer Science
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1 Defending Computer Networks Lecture 23: Transport Layer Security Stuart Staniford Adjunct Professor of Computer Science
2 Logis;cs Apologies again for last Thursday HW 4 due tomorrow No class this Thursday (Thanksgiving) Regular lecture next Tuesday (12/2) Quiz 3, final class that Thursday (12/4)
3 hpps://firstlook.org/theintercept/2014/11/24/secret- regin- malware- belgacom- nsa- gchq/
4 hpp:// top- ;er- espionage- tool- enables- stealthy- surveillance
5
6
7 Main Focus of Today Start on TLS (formerly known as SSL) And various apendant technologies
8 Main Goals of TLS/SSL Transport Layer Security/Secure Sockets Layer Original goal was secure HTTP: HTTPS Now heavily used as basis for VPNs Virtual Private Network Way to provide secure network connec;ons to remote users Used for (POP/SMTP/IMAP over SSL) Used for SIP (VOIP protocol)
9 HTTPS
10 TLS History 1995: SSL 2.0 (Netscape) 1996: SSL 3.0 (Netscape, later RFC 6101) 1999: TLS 1.0 (RFC 2246) 2006: TLS 1.1 (RFC 4346) 2008: TLS 1.2 (RFC 5246, 6176) Supported in latest versions of all major browsers TLS 1.3 under development in 2014
11 TLS: Step 1 Establish unencrypted connec;on Typically over TCP Eg HTTPS over port 443 Has also been implemented over UDP And
12 Possible Future Implementa;ons
13 TLS Handshake To establish parameters of remaining conversa;on Works over TLS Record layer Can also change opera;on of record layer hpp://tech.yanatm.com/?p=338
14 Handshake Overview hpp:// modules06/netsec/lectures/tls/tls.html
15 TLS Client Hello hpp://technet.microsoh.com/en- us/library/cc785811(v=ws.10).aspx
16 TLS Server Hello
17 TLS Cer;ficate Next the server sends its cer;ficate. So what is a cer;ficate? That requires something of a detour Cryptographic hash/message digest Digital signature Cer;ficate
18 Cryptographic Hash Take an input plain text m Outputs a message digest of fixed size h(m) Such that Any change in input will change output significantly (usually totally) Computa;onally infeasible, given h, to find m Computa;onally infeasible to find m 1 and m 2 such that h(m 1 ) = h(m 2 )
19 Example Cryptographic Hashes MD5 (long gone bad) SHA- 1 (star;ng to go bad) SHA- 256 (currently recommended) SHA- 3 (on horizon) Try it openssl md5 bank.c openssl sha1 bank.c openssl sha256 bank.c openssl no- sha256 or openssl help openssl version
20 How SHA- 1 Works Examine the pseudo- code at hpp://en.wikipedia.org/wiki/sha- 1
21 Digital Signature Scheme for guaranteeing that a message is what it appears to be Authen;ca;on was not created by an imposter instead of sender Non- repudia;on Sender cannot deny having sent it Integrity Message not altered in transit
22 Digital Signature Implementa;on Sender Hash message with cryptographic hash fn Encrypt hash with private key (eg RSA) APach signature to message Receiver decrypt signature with public key Recompute hash Make sure signature matches message hash Essen;ally proves that sender was in possession of private key associated with given public key
23 X.509 Cer;ficates Public Key Infrastructure Dates back to 1988 RFC 5280 (IETF version) for prac;cal purposes Tries to solve the problem How do I find/validate the public key for X? Relies on the idea of chain of trust
24 What is in X.509 Cert? Cer;ficate version (eg 3) Serial Number (eg ) Algorithm ID (eg sha1withrsaencryp;on ) Issuer (CA = Cer;ficate Authority, eg Geotrust) Validity Time Interval Cert not to be used outside of this
25 More in X.509 Cert Subject: (eg domain of website) Subject Public Key info Algorithm Public Key data X509 extensions Signature
26 Cer;ficate Authori;es hpp://msdn.microsoh.com/en- us/windows/aa382479(v=vs.90)
27 Hundreds of Root CAs Eg let s examine the list for Mozilla: hpp:// certs/included/
28 Obtaining Cer;ficate to Play hpps:// tools/site+check/ Eg try with openssl x509 - in ny;mes- cert.txt - text more
29 TLS Record Layer hpp:// modules06/netsec/lectures/tls/tls.html
30 TLS Record Format hpp://tech.yanatm.com/?p=338
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