Status of the CORBA Firewall Traversal RFP
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1 Status of the CORBA Traversal RFP Brian Niebuhr Network Associates - NAI Labs DOCsec Annapolis, MD
2 Overview Problem Statement Initial Solution RFP Information Current Submission Questions Status of the CORBA RFP - DOCsec2001 2
3 Problem Statement - Causes Server location transparency s require a priori knowledge of protected resources Peer-to-peer communication model s designed for client-server model Hosts using Network Address Translation (NAT) can be servers Status of the CORBA RFP - DOCsec2001 3
4 Problem Statement - Illustration CORBA Servers Internal Client Private Enclave External Client HTTP Server CORBA Servers Public Enclave Status of the CORBA RFP - DOCsec2001 4
5 Problem Statement - Illustration Client Server Client Enclave Status of the CORBA RFP - DOCsec2001 5
6 Problem Statement - Definition Routing Problem Large numbers of dynamic servers Servers using NAT Combinations of transport and application firewalls Policy Problem Large numbers of dynamic servers Non-traditional hosts as servers (e.g. callbacks) Status of the CORBA RFP - DOCsec2001 6
7 Current Specification IOR contains firewall information Client invokes server-side proxy object to establish connections NORMAL and PASSTHRU connections Similar invocation to enable callbacks Bi-directional GIOP introduced for callbacks Status of the CORBA RFP - DOCsec2001 7
8 Current Specification - Problems Proxified Object References No definition of proxy object lifecycle can t map PASSTHRU connections to the correct target Callback Invocations Client cannot know when to make new_callback() invocation Only in specific firewall configurations Third-party callbacks Status of the CORBA RFP - DOCsec2001 8
9 Current Specification - Problems Bi-directional GIOP Underspecified policies Tied to transport-specific values No mapping from transport endpoints to objects Transport values sometimes unavailable Status of the CORBA RFP - DOCsec2001 9
10 RFP Information New RFP issued last September Initial submissions presented in February One joint initial submission by Borland, IBM, Iona, Sun, and Xtradyne, supported by Network Associates Revised submissions to be presented in July Vote on submission in November Status of the CORBA RFP - DOCsec
11 Current Submission - Goals Uniform connection establishment All GIOP versions Various firewall topologies Various firewall types Various SSL connection termination points Use of NAT Limit required ORB interaction with firewall to protocol inspection Status of the CORBA RFP - DOCsec
12 Current Submission - Overview Many ideas taken from current specification IOR contains firewall path information Connection setup algorithm similar to the use of GIOP 1.2 profile addressing mode Use of bi-directional GIOP for callbacks Uses connection setup message to establish connections Connection setup transparent to application Status of the CORBA RFP - DOCsec
13 Current Submission - Details Host Identifiers describe the endpoints on a host Endpoints provide IIOP, NORMAL_SSL, or PASSTHRU services HID: : IIOP 684: SSL 684: PASSTHRU Status of the CORBA RFP - DOCsec
14 Current Submission - Details Tagged Component Contains an ordered list of Host Ids from the outermost-inbound firewall to the server Multiple components indicate multiple paths IOR Component: HID: : IIOP 684: SSL 684: PASSTHRU HID: : IIOP 684: PASSTHRU HID: : IIOP 684: SSL Status of the CORBA RFP - DOCsec
15 Current Submission - Details Service Context Indicates the path selected by the client Contains the same ordered list of Host Ids with one endpoint selected from each Service Context: HID: : SSL HID: : IIOP HID: : IIOP Status of the CORBA RFP - DOCsec
16 Current Submission - Details Path selection policy Determines which endpoints are chosen from each Host Id Policy examples: NO_SSL GATEWAY_SSL END_TO_END_SSL Configuration is implementation-dependent Status of the CORBA RFP - DOCsec
17 Current Submission - Algorithm Client ORB detects firewall component Client (A) (B) Internet (W) (X) (Y) Server (Z) IOR: W Y Z Internet Servers (DNS,HTTP,etc.) Status of the CORBA RFP - DOCsec
18 Current Submission - Algorithm Client ORB builds service context based on path selection policy Client (A) (B) Internet (W) (X) (Y) Server (Z) W:684/SSL Y:683/IIOP Z:683/IIOP IOR: W Y Z Internet Servers (DNS,HTTP,etc.) Status of the CORBA RFP - DOCsec
19 Current Submission - Algorithm Client ORB connects to client-side proxy and sends message Client (A) (B) Internet (W) (X) (Y) Server (Z) W:684/SSL Y:683/IIOP Z:683/IIOP IOR: W Y Z Internet Servers (DNS,HTTP,etc.) Status of the CORBA RFP - DOCsec
20 Current Submission - Algorithm Client-side proxy determines target and forwards message Client (A) (B) Internet (W) (X) (Y) Server (Z) W:684/SSL Y:683/IIOP Z:683/IIOP IOR: W Y Z Internet Servers (DNS,HTTP,etc.) Status of the CORBA RFP - DOCsec
21 Current Submission - Algorithm Server-side proxy observes which endpoints were chosen Client (A) (B) Internet (W) (X) (Y) Server (Z) IOR: W Y Z Internet Servers (DNS,HTTP,etc.) Status of the CORBA RFP - DOCsec
22 Current Submission - Algorithm Server-side proxy sends a reply Client (A) (B) Internet (W) (X) (Y) Server (Z) Reply IOR: W Y Z Internet Servers (DNS,HTTP,etc.) Status of the CORBA RFP - DOCsec
23 Current Submission - Algorithm SSL connection is established Client (A) (B) SSL Internet (W) (X) (Y) Server (Z) IOR: W Y Z Internet Servers (DNS,HTTP,etc.) Status of the CORBA RFP - DOCsec
24 Current Submission - Algorithm Normal GIOP communication occurs Client (A) (B) SSL Internet (W) (X) (Y) Server (Z) GIOP IOR: W Y Z Internet Servers (DNS,HTTP,etc.) Status of the CORBA RFP - DOCsec
25 Current Submission - Details Callbacks Routing problem solved like server-side invocations Policy problem Bi-directional GIOP for server-to-client invocations Third-party callbacks must be avoided Delegated Identity A trusted firewall can present the identity of the client or server for NORMAL_SSL connections Status of the CORBA RFP - DOCsec
26 Current Submission - Details Access Control Lightweight access control based on MDI MDI provided by server ORB in the IOR Client sends MDI in request message MDI must be verified by the server ORB before performing request Dynamic Port Administration Alternative solution based on dynamic configuration of the firewall Status of the CORBA RFP - DOCsec
27 Summary New RFP issued to address problems with the CORBA firewall specification Goals of current submission Uniform connection setup Limit ORB interaction with firewall Current submission provides transparent connection setup via ORB invocation on target object Status of the CORBA RFP - DOCsec
28 Questions? Contact Information: Brian Niebuhr Status of the CORBA RFP - DOCsec
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