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NOTE You can also use xinetd to implement SSH port forwarding, should your system be used to
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tunnel connections between hosts or services
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TCP Wrappers
TCP wrappers add another level of security to xinetd-managed servers In effect, the server is wrapped with an intervening level of security, monitoring connections and controlling access A server connection made through xinetd is monitored, verifying remote user identities and checking to make sure they are making valid requests Connections are logged with the syslogd daemon (see 27) and may be found in syslogd files such as /var/log/secure With TCP wrappers, you can also restrict access to your system by remote hosts Lists of hosts are kept in the hostsallow and hostsdeny files Entries in these files have the format service:hostname:domain The domain is optional For the service, you can specify a particular service, such as FTP, or you can enter ALL for all services For the hostname, you can specify a particular host or use a wildcard to match several hosts For example, ALL will match on all hosts Table 21-8 lists the available wildcards In the following example, the first entry allows access by all hosts to the web service, http The second entry allows access to all services by the pango1traincom host The third and fourth entries allow FTP access to rabbittrekcom and sparrowcom:
http:ALL ALL:pango1traincom ftp:rabbittrekcom ftp:sparrowcom
Wildcard ALL LOCAL UNKNOWN KNOWN PARANOID EXCEPT
Description Matches all hosts or services Matches any host specified with just a hostname without a domain name Used to match on hosts in the local domain Matches any user or host whose name or address is unknown Matches any user or host whose name or address is known Matches any host whose hostname does not match its IP address An operator that lets you provide exceptions to matches It takes the form of list1 EXCEPT list2 where those hosts matched in list1 that are also matched in list2 are excluded
PART VI
TABLE 21-8 TCP Wrapper Wildcards
Part VI:
Internet and Network Services
The hostsallow file holds hosts to which you allow access If you want to allow access to all but a few specific hosts, you can specify ALL for a service in the hostsallow file but list the ones you are denying access to in the hostsdeny file Using IP addresses instead of hostnames is more secure because hostnames can be compromised through the DNS records by spoofing attacks when an attacker pretends to be another host When xinetd receives a request for an FTP service, a TCP wrapper monitors the connection and starts up the inftpd server program By default, all requests are allowed To allow all requests specifically for the FTP service, you enter the following in your /etc/hosts allow file The entry ALL:ALL opens your system to all hosts for all services:
ftp:ALL
TIP Originally, TCP wrappers were managed by the tcpd daemon However, xinetd has since
integrated support for TCP wrappers into its own program You can explicitly invoke the tcpd daemon to handle services if you wish The tcpd Man pages (man tcpd) provide more detailed information about tcpd
CHAPTER
FTP Servers
he File Transfer Protocol (FTP) is designed to transfer large files across a network from one system to another Like most Internet operations, FTP works on a client/ server model FTP client programs can enable users to transfer files to and from a remote system running an FTP server program Any Linux system can operate as an FTP server It has to run only the server software an FTP daemon with the appropriate configuration Transfers are made between user accounts on client and server systems A user on the remote system has to log in to an account on a server and can then transfer files to and from that account s directories only A special kind of user account, named ftp, allows any user to log in to it with the username anonymous This account has its own set of directories and files that are considered public, available to anyone on the network who wants to download them The numerous FTP sites on the Internet are FTP servers supporting FTP user accounts with anonymous login Any Linux system can be configured to support anonymous FTP access, turning them into network FTP sites Such sites can work on an intranet or on the Internet
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