EuroCamp A federated framework for secure videoconference
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1 EuroCamp A federated framework for secure videoconference Daniel Kouril, Michal Prochazka
2 Acknowledgement This work is funded by CESNET Development Fund Masaryk University EuroCamp '08 - Stockholm 2
3 Outline Introduction PKI - Digital certificate OpenVPN Secured videoconferencing Federated Online CA CAT Federated framework Conclusion EuroCamp '08 - Stockholm 3
4 Introduction Problems with makeing applications federation-aware Closed-source applications Prohibited by the licence Sometimes it is not possible Today's federations are mainly focused on the web environment Most of videoconferencing applications are non-web Missing authorization or it is based on the shared password Several groups need secure and close collaborative environment people from medical env., secret research,... Users are not IT professionals, do not bother them with security technologies EuroCamp '08 - Stockholm 4
5 Digital certificate Has defined structure X.509 Issued by trusted certification authority PKI is not user-friendly but in some cases it is widely used SSL, SSH, HTTPs,... Holds public information: Issuer of the certificate Holder of the certificate Public key of the holder Issue data and expiration date Additional information in form of extensions CRL, OSCP responder, Policy,... EuroCamp '08 - Stockholm 5
6 Example of the certificate Certificate: Data: Version: 3 (0x2) Serial Number: (0x42b3310b) Signature Algorithm: sha1withrsaencryption Issuer: DC=cz, DC=cesnet-ca, CN=CESNET CA Validity Not Before: Aug 29 12:34: GMT Not After : Sep 29 13:04: GMT Subject: DC=cz, DC=cesnet-ca, O=Masaryk University, CN=Daniel Kouril Subject Public Key Info: Public Key Algorithm: rsaencryption RSA Public Key: (1024 bit) Modulus (1024 bit): 00:95:18:71:fe:83:bb:8c:26:fd:ba:62:c3:55:d7: f9:6a:57:71:a0:e9:34:1d:e6:a6:bd:ae:a8:20:1a: 17:87:b1:c8:90:56:2a:1b:3e:cb:0c:8e:eb:ef:fa: 72:80:9a:73:33:a4:b4:df:48:0f:b1:bb:b5:d3:78: 4c:11:6c:cd:ab:9e:3e:04:8c:bd:07:5c:63:0c:2a: a4:32:5f:c5:4f:27:92:74:53:24:98:56:57:ae:eb: fa:1f:f3:a9:6c:26:24:09:88:9a:b8:c8:2c:83:89: 5d:70:78:d7:8b:cb:c4:51:35:b9:be:b6:46:ce:d5: 7e:59:01:63:7b:75:bf:e5:7f Exponent: (0x10001) X509v3 extensions: X509v3 Key Usage: critical Digital Signature, Key Encipherment, Data Encipherment X509v3 Certificate Policies: Policy: X509v3 Subject Alternative Name: kouril@ics.muni.cz X509v3 CRL Distribution Points: DirName:/DC=cz/DC=cesnet-ca/CN=CESNET CA/CN=CRL2 URI: URI:ldap://ldap.cesnet-ca.cz/cn=CESNET%20CA,dc=cesnet-ca,dc=cz?certificateRevocationList X509v3 Authority Key Identifier: keyid:2f:6c:05:c3:51:26:ac:af:39:9c:3e:38:35:dd:52:29:27:80:c5:f5 X509v3 Subject Key Identifier: AA:47:80:4C:53:1F:17:D6:CD:09:1D:D8:56:36:77:4C:39:00:13:D3 EuroCamp '08 - Stockholm 6
7 OpenVPN Creates VPN tunnel on the application level of ISO/OSI Creates virtual network adapter on the client Firewall and NAT traversal Capable of creating bridged or routed tunnels Supports Ipv6 Supports Linux, *BSD, Mac OS X, Windows, Solaris Primary authentication by the digital certificates Variety of approaches for AuthN/AuthZ PAM, scripts, username/password, static key Transparent for the applications EuroCamp '08 - Stockholm 7
8 OpenVPN - Latency EuroCamp '08 - Stockholm 8
9 Secured Collaborative Env. User needs digital certificates from the CA Users have problems with acquireing the certificate Need to manage users Videoconference uses Mbone tools (VIC, RAT) Can't be used behind the NAT - uses UDP and RTP OpenVPN server Assignes public IP but does not route them outside of the tunnel - prevent IP collision at the client's network Applications are accessible only through the tunnel Process auhtn and authz Instalation package for the users EuroCamp '08 - Stockholm 9
10 EuroCamp '08 - Stockholm 10
11 Federated Online CA Combines RA and CA together Clients are authenticated at theirs home institution Automated and less administrative work We are operating two types of Online CA based on GridShib based on OpenSSL and Perl scripts Issues short and mid lived certificates Puts SAML response from IdP into the certificate EuroCamp '08 - Stockholm 11
12 Federated Online CA CESNET has OnlineCA in pre-production mode Uses HSM Can provide unlimited number of different CAs based on different profiles We are discussing design of API to the Online CA SAML Single Sign-on Browser/Artifact Profile Security Analysis of the SAML Single Sign-on Browser/Artifact Profile (Thomas Groß) EuroCamp '08 - Stockholm 12
13 Current Status Modification to the OpenVPN enhanced authn based on the digital certificates added support for processing SAML extensions Functional federated OnlineCA AuthZ is transfered in form of attribute inside the certificate as an extension Private key is not encrypted do not bother us due to short live time of the certificate allows easy integration with the applications Installation package for videoconferening tools EuroCamp '08 - Stockholm 13
14 Framework design EuroCamp '08 - Stockholm 14
15 CAT Common Access Toolkit for Federations General framework which allows integrate applications into the federation Secure and authenticated tunnel from application to the server One of the main purpose is to make authn/authz transparent for the user GUI tool for managing credentials for users acquiring, translating, deleting, checking validity EuroCamp '08 - Stockholm 15
16 Network Identity Manager EuroCamp '08 - Stockholm 16
17 Network Identity Manager EuroCamp '08 - Stockholm 17
18 Network Identity Manager EuroCamp '08 - Stockholm 18
19 Federated Framework General framework - client software independent Transparent security from appz and user point of view Appz do not need to solve AuthN and AuthZ Minimal requirements on the network configuration only one specific stream which has to be enabled on the firewalls NAT traversal, HTTP proxy support Clients' machines could be managed EuroCamp '08 - Stockholm 19
20 Related Work Adobe Connect Commercial tool for collaboration Flash based => run inside the browser AuthN/AuthZ only by username/password Ongoing work on make it Shibboleth SP During testing we have discovered some problems missing fine graind access rights interruptions some bugs in UI EuroCamp '08 - Stockholm 20
21 Future Work Use Stunnel/OpenSSL TLS/DTLS it doesn't require administrative rights allow to make per port tunnels EuroCamp '08 - Stockholm 21
22 This is the end... EuroCamp '08 - Stockholm 22
23 Ithanet einfrastructure Ithanet is a Euromediterranean network of research centres conducting molecular and clinical research of thalassaemia and related haemoglobinopathies. OpenVPN + UDP Packet reflector + MBone tools Public IP addresses are assigned inside the tunnel, but they are not routed outside protection against IP collision at the connected institutions Client installation package for Win2000/XP easy to install, easy to use (one click to start/stop the conference) X.509 based AuthN - OTP used to obtain the certificate EuroCamp '08 - Stockholm 23
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