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IP filtering is commonly used for two purposes: to secure a network from attacks and intrusion from rogue users on outside hosts, and to prevent the broadcast and transmission of unauthorized data from an internal network to the rest of the Internet In the former case, an attacker may attempt to gain entry to your system by using an application like telnet, or may try to insert or retrieve data from a database by connecting to a database listener and issuing SQL commands from a client application Both of these scenarios are common enough to motivate many sites to restrict all incoming traffic to their networks, except on a very small number of specific ports Commonly allowed ports include Secure shell (ssh) on port 22 Secure copy (scp) on port 24 Mail server (sendmail) on port 25 DNS server on port 53.

Part V:

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Web server (apache) on port 80 This may seem like a very minimal list to many administrators, but the fact is that almost every UNIX daemon has been discovered to suffer from buffer overflow problems in recent years, as discussed in 9, leaving systems open to exploitation A rule of thumb is to only allow services that users definitely need to be productive and that have been approved by management Some users might argue that allowing the finger service is useful, but it also gives away a lot of information about home directories and valid usernames that can be exploited by rogue users In addition, some users may set up Web and FTP servers without permission Because Solaris only restricts ports below 1024 for the superuser and system accounts, all ports above 1024 are available for users to engage in unauthorized activities for which your company may be held responsible.

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For example, a user might run a Web server on port 8080 that distributes pirate software: if a software manufacturer discovers this operation, it will most likely sue your company rather than the individual involved Blocking access to all ports, unless they are specifically required or sanctioned, limits these kinds of problems What is less intuitive than restricting incoming traffic is the notion of also restricting outgoing traffic Firewalls are able to manage both incoming and outgoing traffic because a firewall may also act as a router, and routers always have at least two network interfaces One good reason to consider blocking outgoing network on some ports is that users may engage in leisure activities, such as playing networked adventure games, when they should be working.

Since you don t really want to be the police officer patrolling the system for violators, it is best just to restrict any access in the first place to avoid any problems down the track It s also possible to use a firewall to accept or deny connections based on IP address: obviously, a machine making a connection from the external network, but pretending to have an address from inside the network, should be identified and its attempts rejected (this is known as IP spoofing) Figure 23-4 summarizes the functions of a router that acts as a packet-filtering firewall Permitted ports are labeled OK, while denied ports are labeled NO All connections for sendmail (25) are accepted, as are ssh connections.

However, external connections to a database listener are rejected (port 1521), and a machine on the external network that is spoofing an internal network IP address has all its connections rejected..

The routing table maintains an index of routes to networks and routers that are available to the local host. Routes can be determined dynamically, by using RDISC for example, or can be added manually, by using route or ifconfig. These commands are normally used at boot time to initialize network services. There are three kinds of routes: Host routes network. Map a path from the local host to another host on the local

Network routes Allow packets to be transferred from the local hosts to other hosts on the local network.

23:

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FIGURE 23-4

Default routes Pass the task of finding a route to a router. Both RIP and RDISC daemons can use default routes. Dynamic routing often causes changes in the routing table after booting, when a minimal routing table is configured by ifconfig when initializing each network interface, as the daemons manage changes in the network configuration and router availability.

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