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CS 356 – Lecture 28 Internet Authentication

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CS 356 – Lecture 28 Internet Authentication CS 356 – Lecture 28 Internet Authentication Spring 2013 Review • Chapter 1: Basic Concepts and Terminology • Chapter 2: Basic Cryptographic Tools • Chapter 3 – User Authentication • Chapter 4 – Access Control Lists • Chapter 5 – Database Security (skipped) • Chapter 6 – Malicious Software • Networking Basics (not in book) • Chapter 7 – Denial of Service • Chapter 8 – Intrusion Detection • Chapter 9 – Firewalls and Intrusion Prevention • Chapter 10 – Buffer Overflow • Chapter 11 – Software Security • Chapter 12 – OS Security • Chapter 22 – Internet Security Protocols • Chapter 23 – Internet Authentication Applications Chapter 23 Internet Authentication Applications Kerberos Overview • initially developed at MIT • software utility available in both the public domain and in commercially supported versions • issued as an Internet standard and is the defacto standard for remote authentication • overall scheme is that of a trusted third party authentication service • requires that a user prove his or her identity for each service invoked and requires servers to prove their identity to clients Kerberos Protocol involves clients, application servers, and a Kerberos server • designed to counter a variety of threats to the security of a client/server dialogue • obvious security risk is impersonation • servers must be able to confirm the identities of clients who request service use an Authentication Server (AS) • user initially negotiates with AS for identity verification • AS verifies identity and then passes information on to an application server which will then accept service requests from the client need to find a way to do this in a secure way • if client sends user’s password to the AS over the network an opponent could observe the password • an opponent could impersonate the AS and send a false validation 2. AS verifies user's access right in Kerberos Overview database, creates ticket-granting ticket and session key. Results are encrypted using key derived from user's password. once per user logon Kerberos session Authentication Server (AS) request ticket- 1. User logs on to granting ticket workstation and requests service on host. ticket + session key request service- Ticket- granting ticket granting Server (TGS) ticket + session key once per type of service 3. Workstation prompts 4. TGS decrypts ticket and user for password and authenticator, verifies request, uses password to decrypt then creates ticket for requested incoming message, then request service server. sends ticket and authenticator that contains user's name, network address, and provide server time to TGS. authenticator once per 6. Server verifies that service session ticket and authenticator 5. Workstation sends match, then grants access ticket and authenticator to service. If mutual to server. authentication is required, server returns an authenticator. Figure 23.1 Overview of Kerberos Kerberos Realms • a Kerberos environment consists of: – a Kerberos server – a number of clients, all registered with server – a number of application servers, sharing keys with server • this is referred to as a realm – networks of clients and servers under different administrative organizations generally constitute different realms • if multiple realms: – their Kerberos servers must share a secret key and trust the Kerberos server in the other realm to authenticate its users – participating servers in the second realm must also be willing to trust the Kerberos server in the first realm Realm A Kerberos Client 1. request ticket for local TGS AS 2. ticket for local TGS 3. request ticket for remote TGS 4. ticket for remote TGS TGS 7. request remote service Kerberos 5 request ticket for remote server 6 ticket for remote server Realms Kerberos AS TGS Server Realm B Figure 23.2 Request for Service in Another Realm Kerberos Versions 4 and 5 • Kerberos v4 is most widely used version • improvements found in version 5: – an encrypted message is tagged with an encryption algorithm identifier • this enables users to configure Kerberos to use an algorithm other than DES – supports authentication forwarding • enables a client to access a server and have that server access another server on behalf of the client • supports a method for interrealm authentication that requires fewer secure key exchanges than in version 4 Kerberos Performance Issues • see larger client-server installations environment: • very little if system is properly configured • tickets are reusable which reduces traffic • Kerberos performance impact in a large-scale Kerberos security is best assured by placing the Kerberos server on a separate, isolated machine • motivation for multiple realms is administrative, not performance related Certificate Authority (CA) certificate consists of: • a public key plus a User ID of the key owner • signed by a trusted third party • typically the third party is a CA that is trusted by the user community (such as a government agency or a financial institution) user can present his or her public key to the authority in a secure manner and obtain a certificate • user can then publish the certificate • anyone needing this user’s public key can obtain the certificate and verify that it is valid by way of the attached trusted signature X.509 Authentication Service universally accepted • widely used in network security applications, standard for formatting including IPsec, SSL, public-key certificates SET, and S/MIME part of CCITT X.500 directory service standards uses public-key crypto • algorithms not standardized, but RSA & digital signatures recommended X.509 Certificates Signature algorithm Version algorithm parameters identifier Certificate Issuer Name Serial Number Signature algorithm algorithm This Update Date parameters identifier Issuer Name Next Update Date Period of not before 1 Version Revoked user certificate serial # validity not after certificate revocation date Version 2 Version Subject Name ! Subject's ! algorithms 3 Version public key parameters ! info key Issuer Unique Revoked user certificate serial # Identifier certificate revocation date Subject Unique algorithms Signature parameters Identifier encrypted hash Extensions (b) Certificate Revocation List algorithms Signature parameters encrypted hash all versions (a) X.509 Certificate Figure 23.3 X.509 Formats PKI users certificate/CRL retrieval End entity registration, Public initialization, certification, Key Registration key pair recovery, certificate authority key pair update publication revocation request certificate/CRL Infrastructure publication Certificate authority Certificate/CRL Repository Certificate/CRL X.509 cross CRL issuer CRL certification publication Certificate (PKIX) authority PKI management entities Figure 23.4 PKIX Architectural Model PKIX Management Functions registration initialization certification key pair key pair revocation recovery update request cross certification Federated Identity Management • use of common identity management scheme – across multiple enterprises and numerous applications – supporting many thousands, even millions of users • principal elements are: – authentication, authorization, accounting, provisioning, workflow automation, delegated administration, password synchronization, self-service password reset, federation Identity Management Administrators provide Administrator attributes Administrator Attribute service Principals provide attributes Attribute service Principal Attribute service Principal Principal Data consumers apply references to obtain attribute data Identity Provider Data consumer Principals Data consumer Identity control Attribute authenticate, interface locator manage their identity elements Principal Identifier Data consumers obtain authentication translation identifiers, attribute references Figure 23.5 Generic Identity Management Architecture Standards Used Security Extensible Simple Object Assertion Markup Markup Access Protocol WS-Security Language Language (XML) (SOAP) (SAML) XML-based characterizes set of SOAP language for text elements extensions for the exchange in a document implementing for invoking of security on code using message information appearance, XML over integrity and between function, HTTP confidentiality online meaning, or in Web business context services partners Federated Identity Management Workplace.com W orkplace.com Initial (employee portal) User store Initial (employee portal) User store authentication Name ID authentication Name ID Dept Links: Joe 1213 Links: Joe 1213 Eng health benefits Jane 1410 parts supplier Jane 1410 Purch etc. Ravi 1603 etc. Ravi 1603 Purch End user End user (employee) (employee) Health.com PartsSupplier.com User store Welcome Joe! User store Name ID Role Joe 1213 Technical doc. Jane 1410 Troubleshooting Engineer Ravi 1603 Purchaser (a) Federation based on account linking (b) Federation based on roles Initial message authentication Workplace.com Soap PinSupplies.com Soap Procurement message Purchasing message application Web service End user E-ship.com Shipping Web service (b) Chained Web Services Figure 23.6 Federated Identity Scenarios Summary • Kerberos • public-key • Kerberos protocol infrastructure • Kerberos realms • PKIX management functions • Kerberos versions 4 and 5 • PKIX management protocols • Kerberos performance issues • federated identity management • X.509 .
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