OS/390 Firewall Technology Overview
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1 OS/390 Firewall Technology Overview Washington System Center Mary Sweat E - Mail: [email protected]
2 Agenda Basic Firewall strategies and design Hardware requirements Software requirements Components of OS/390 Firewall Enhancements in latest release of OS/390 Firewall
3 What is a Firewall A solution that provides controlled access between a private (trusted) network, and an untrusted network such as the Internet A tool for enforcing your network security policy Untrusted Network Firewall Trusted Network
4 Why Use a Firewall??????????????????????????????????????? Limit access by persons within the secure network to selected resources in the non-secure network Reduce network traffic outside the secure network Improve performance within the secure network??????????????????????????????????????
5 Firewall Strategies Filtering Information Hiding Authentication allowed Encryption Security/Audit
6 Basic Design Decisions in a Firewall Ensure physical security Configure the firewall by disallowing everything and then proceed by enabling those services defined in the security policy Support only required applications and remove or disable others Security policy that defines how a firewall should function in cooperation with the security group/advisors what type of traffic is allowed through the firewall and under what conditions Audibility PASS FW Rules
7 Firewall Technologies Tools Included with the OS/390 Security Server Configuration Commands Configuration Client (GUI) Proxy FTP server Socks Server Logging Server Real Audio Support Included with the enetwork Communications Server for OS/390 Network Address Translation (NAT) with Crypto HW IP Filters IP Tunnels (IPSec or Virtual Private Network)
8 Hardware Any communication hardware interface supported by the TCP/IP protocol stack to make the network connections OSA, 3172, CTC, XCF, etc. At least two network interfaces; one network interface connects the secure, internal network that the firewall protects the other network interface connects to the nonsecure, outside network or internet Secure Non-secure ICSF/MVS V2 R1.0 and Prog. Cryptographic Option this is optional requirement as firewall can use software encryption
9 Software OS/390 Security Server (RACF) OS/390 enetwork Communications Server OS/390 Unix services (OpenEdition) OS/390 C/C++ Collection Cl. Lib.
10 Software for Configuration Client AIX Java.rte or AIX 4.2 or higher (as long as Java.rte level is supported) Netscape nav.rte Windows 95 or Windows NT Web browser with Java and frames support Zip tool that handles long file names WinZip32 tool in WinZip
11 IP Filters Packet filtering looks at every packet coming into the IP stack, and determines whether the filter rules allow the packet to be sent to its destination. Filtering checks; -- source and destination IP address & mask -- source and destination port -- direction of the data flow -- IP protocol -- type of interface (secure or nonsecure) -- fragmentation -- tunnel ID TCP/IP IP Filter Rules Interfaces Non-secure Net Secure Net
12 IP Datagram - Unit of Data bit version 4-bit hdr. length TOS Type of Service 16-bit total length in bytes 16-bit identification 3-bit fragment flags 13-bit fragment offset 8-bit TTL Time to Live 8-bit Protocol number 16-bit header checksum 20 bytes 32-bit Source IP Address 32-bit Destination IP Address IP Datagram options (If any present) DATA (If protocol is TCP, this is a TCP segment, if protocol is UDP, this is a UDP Datagram)
13 FTP Proxy Support OS/390 Firewall Technologies supply an FTP proxy server (pftpd) access controlled on a user-by-user basis to go out of the secure network to come in from the non-secure world local ftp commands disabled on the firewall Users ftp to the firewall and with valid authorizations, pftpd contacts FTP server outside the secure network Secure Network ftp pftpd Non-Secure Network destination ftp server ftp client
14 Socks A socks dæmon sits between the client and destination server socks dæmon is generic can handle traffic for multiple, different applications Socks replaces the IP address of the user with the address of the firewall ftp telnet... (Socksified Clients) client socks dæmon server Any application protocol
15 Virtual Private Networks Virtual Private Networking (VPN) allows secure communications between remote sites over a public network like the internet Firewall BETA Firewall ALPHA Secure Network #1 Tunnel INTERNET Secure Network #2
16 Network Address Translation (NAT) Network Address Translation provides a translation from an internal (secure) IP address to an temporary external registered address Secure Network t.h.5.0 NAT Pool RESERVE t.h TRANSLATE TCP/IP TCP/IP NAT Non-Secure Network src=t.h.f.1 dest=t.h.5.9 src=t.h.f.1 dest= t.h.f.1
17 Logging/Configuration/Administration Logging Critical to the security of any system Ability to reliably detect potential intrusions implies the ability to collect and save information about transactions GUI/Commands are used to configure and administer the firewall technologies define secure and non-secure adapters set logging parameters define rules for packet filtering and socks define VPN
18 Firewall enhancements in latest release (R7) Support multiple TCP/IP stacks Firewall daemon enhancements GUI user interface & configuration server IPSec enhancements for VPNs New firewall commands
19 Multi-Stack 8 Firewalls can now run simultaneously in prior releases, system was restricted to one utilizes TCP/IP stack (OS/390 supports 8) Firewall configuration commands made "stack-aware" new commands associate firewall functions with particular stack each firewall could have a potentially different configuration
20 FTP & SOCKS Enhancements Number of connections allowed is vastly increased Administrator can determine number of connections allowed... client socks dæmon server Non-Secure Network Secure Network ftp pftpd destination ftp server ftp client
21 Graphical User Interface Graphical User Interface (GUI) written in JAVA installs / runs on Windows 95/NT & AIX Configuration Server runs on OS/390 GUI Security uses Secure Sockets Layer (SSL) GUI Client SSL Configuration Server
22 IPSec Enhancements for VPNs Uses upgraded IPSec that supports new standards triple DES replay prevention new authentication processes encryption standard contains ability to also authenticate Partner's Firewall INTERNET Firewall IPSec Packet Encrypted Packet Tunnel
23 QUESTIONS
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