Using the MyProxy Online Credential Repository
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1 Using the MyProxy Online Credential Repository Jim Basney National Center for Supercomputing Applications University of Illinois
2 What is MyProxy? Independent Globus Toolkit add-on since 2000 To be included in Globus Toolkit 4.0 A service for securing private keys Keys stored encrypted with user-chosen password Keys never leave the MyProxy server A service for retrieving proxy credentials A commonly-used service for grid portal security Integrated with OGCE, GridSphere, and GridPort GlobusWORLD
3 PKI Overview Public Key Cryptography Sign with private key, verify signature with public key Encrypt with public key, decrypt with private key Key Distribution signs Issuer: CA Subject: CA Who does a public key belong to? Certification Authority (CA) verifies user s identity and signs certificate Certificate is a document that binds the user s identity to a public key Issuer: CA Subject: Jim Authentication Signature [ h ( random, ) ] GlobusWORLD
4 Proxy Credentials RFC 3820: Proxy Certificate Profile Associate a new private key and certificate with existing credentials Short-lived, unencrypted credentials for multiple authentications in a session Restricted lifetime in certificate limits vulnerability of unencrypted key Credential delegation (forwarding) without transferring private keys signs signs signs CA User Proxy A Proxy B GlobusWORLD
5 Proxy Delegation Delegator Delegatee 2 Proxy certificate request 1 Generate new key pair 3 Sign new proxy certificate Proxy 4 Proxy Proxy GlobusWORLD
6 MyProxy System Architecture MyProxy client Store proxy Retrieve proxy MyProxy server Proxy delegation over private TLS channel Credential repository GlobusWORLD
7 MyProxy: Credential Mobility tg-login.ncsa.teragrid.org Obtain certificate Store proxy ca.ncsa.uiuc.edu tg-login.caltech.teragrid.org myproxy.teragrid.org tg-login.sdsc.teragrid.org Retrieve proxy tg-login.uc.teragrid.org GlobusWORLD
8 MyProxy and Grid Portals MyProxy server Login Portal Fetch proxy Access data GridFTP server GlobusWORLD
9 MyProxy: User Registration Request account Set username/password Registration portal Obtain user certificate Certificate authority Load user s credentials Login with username/password Grid portal Retrieve proxy MyProxy server PURSE: Portal-based User Registration Service ESG GlobusWORLD
10 MyProxy Security Keys encrypted with user-chosen passwords Server enforces password quality Passwords are not stored Dedicated server less vulnerable than desktop and general-purpose systems Professionally managed, monitored, locked down Users retrieve short-lived credentials Generating new proxy keys for every session All server operations logged to syslog Caveat: Private key database is an attack target Compare with status quo GlobusWORLD
11 Hardware-Secured MyProxy Protect keys in tamper-resistant cryptographic hardware Retrieve proxy MyProxy Server Proxy request Proxy certificate IBM 4758 M. Lorch, J. Basney, and D. Kafura, "A Hardware-secured Credential Repository for Grid PKIs," 4th IEEE/ACM International Symposium on Cluster Computing and the Grid (CCGrid), April GlobusWORLD
12 GlobusWORLD 2003 Flashback GlobusWORLD
13 Credential Renewal Long-lived jobs or services need credentials Task lifetime is difficult to predict Don t want to delegate long-lived credentials Fear of compromise Instead, renew credentials as needed during the job s lifetime Renewal service provides a single point of monitoring and control Renewal policy can be modified at any time Disable renewals if compromise is detected or suspected Disable renewals when jobs complete GlobusWORLD
14 MyProxy: Credential Renewal Submit job Condor-G Submit job Refresh proxy Globus gatekeeper Fetch proxy MyProxy server GlobusWORLD
15 MyProxy Installation (Unix) Included in GT 4.0 As an add-on component to GT 3.x $ gpt-build myproxy*.tar.gz <flavor> Set $MYPROXY_SERVER environment variable to myproxy-server hostname $ export MYPROXY_SERVER=myproxy.ncsa.uiuc.edu Set Globus Toolkit environment $. $GLOBUS_LOCATION/etc/globus-user-env.sh Client installation/configuration complete! GlobusWORLD
16 MyProxy CoG Clients Commodity Grid (CoG) Kits Provide portable (Java and Python) MyProxy client tools & APIs Windows support For more information: GlobusWORLD
17 MyProxy Commands myproxy-init: store proxy myproxy-get-delegation: retrieve proxy myproxy-info: query stored credentials myproxy-destroy: remove credential myproxy-change-pass-phrase: change password encrypting private key GlobusWORLD
18 MyProxy Server Administration Install server certificate and CA certificate(s) Configure /etc/myproxy-server.config policy Template provided with examples Optionally: Configure password quality enforcement Install cron script to delete expired credentials Install boot script and start server Example boot script provided Use myproxy-admin commands to manage server Reset passwords, query repository, lock credentials GlobusWORLD
19 MyProxy Server Policies Who can store credentials? Restrict to specific users or CAs Restrict to administrator only Who can retrieve credentials? Allow anyone with correct password Allow only trusted services / portals Maximum lifetime of retrieved credentials server-wide and per-credential GlobusWORLD
20 MyProxy and SASL MyProxy supports additional authentication mechanisms via SASL (RFC 2222) One Time Passwords (SASL PLAIN with PAM) Protect against stolen passwords Hardware token generates OTP Authenticate with OTP plus MyProxy password Tested with CryptoCard tokens Kerberos (SASL GSSAPI) Authenticate with Kerberos ticket plus MyProxy password GlobusWORLD
21 Related Work GT4 Delegation Service Protocol based on WS-Trust and WSRF SACRED (RFC 3767) Credential Repository Kerberized Online CA (KX.509/KCA) Kerberos -> PKI PKINIT for Heimdal Kerberos PKI -> Kerberos GlobusWORLD
22 GridLogon Work in progress Inspired by Peter Gutmann s PKIBoot Plug-and-Play PKI: A PKI your Mother can Use Password-based authentication to initialize user s security environment Install identity/attribute/authorization credentials Install CA certificates and CRLs Install additional security configurations GlobusWORLD
23 MyProxy Community mailing list Bug tracking: Anonymous CVS access Contributions welcome! Feature requests, bug reports, patches, etc. GlobusWORLD
24 Thank you! Questions/Comments? Contact: GlobusWORLD
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