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server name as with tcpd). If protocol is not defined, the default protocol for the service is used.
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service ftp { socket_type = stream wait = no user = root protocol = ftp server = /usr/sbin/in.ftpd server_args = -l -a disable = yes }
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Services can be turned on and off with the disable attribute. In the previous example, the disable attribute has turned off the FTP service, keeping the FTP server shut down. To enable a service, you would set the disable attribute to no, as shown here:
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disable = no
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You then have to restart xinetd to start the service.
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# /etc/rc.d/init.d/xinetd restart
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Note Red Hat currently disables all the services it initially set up when it installed xinetd. To enable a particular service you will have to set its disable attribute to no. To enable management by chkconfig, a commented default and description entry need to placed before each service segment. Where separate files are used, these are placed at the head of each file. Red Hat already provides these for the services it installs with its distribution such as wu-fptd and swat. A default entry can be either on or off. For example, the chkconfig default and description entries for the ftp service are shown here:
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# default: on # description: The wu-ftpd FTP server serves FTP connections. It \ # uses normal, unencrypted usernames and passwords for \ # authentication.
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Red Hat will indicate whether a service is set on or off by default. Should you want to turn on a service that is off by default, you will have to set its disable attribute to no, and restart xinetd. The Red Hat entry for the wu-ftpd FTP server is shown here. An initial comment tells us that it is on by default, but then the disable attribute turns it off.
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# default: on # description: The wu-ftpd FTP server serves FTP connections. It \ # uses normal, unencrypted usernames and passwords for \ # authentication. service ftp { socket_type = stream wait = no user = root server = /usr/sbin/in.ftpd server_args = -l -a log_on_success += DURATION USERID log_on_failure += USERID
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nice disable
= 10 = yes
You can further add a variety of other attributes such as logging information about connections and server priority (nice). In the following example, the log_on_success attribute will log the duration (DURATION) and the user ID (USERID) for connections to a service, log_on_failure will log the users that failed to connect, and nice will set the priority of the service to 10.
log_on_success += DURATION USERID log_on_failure += USERID nice = 10
The default attributes defined in the defaults block often set global attributes such as default logging activity and security restrictions. log_type specifies where logging information is to be sent, such as to a specific file (FILE) or to the system logger (SYSLOG). log_on_success will specify information to be logged when connections are made, and log_on_failure will specify information to be logged when they fail.
log_type = SYSLOG authpriv log_on_success = HOST PID log_on_failure = HOST RECORD
For security restrictions, you can use only_from to restrict access by certain remote hosts. no_access denies access by the listed hosts, but no others. These controls take as their values IP addresses. You can list individual IP addresses, or a range of IP addresses, or a network using the network address. The instances attributes will limit the number of server processes that can be active at once for a particular service. The following examples restrict access to a local network 192.168.1.0 and the localhost, deny access from 192.168.1.15, and use the instances attribute to limit the number of server processes at one time to 60.
only_from only_from no_access instances = = = = 192.168.1.0 localhost 192.168.1.15 60
A sample default block is shown here:
defaults { instances = 60 log_type = FILE /var/log/servicelog log_on_success = HOST PID log_on_failure = HOST RECORD only_from = 192.168.1.0 only_from = localhost no_access = 192.168.1.15 }
The xinetd program also provides several internal services including time, services, servers, and xadmin. The services service provides a list of currently active services, and servers provides information about servers. xadmin provides xinetd administrative support.
Instead of having one large xinetd.conf file, you can split it into several configuration files, one for each service. You do this by creating an xinetd.conf file with an includedir attribute that specifies a directory to hold the different service configuration files. In the following example, the xinetd.d directory will hold xinetd configuration files for services like wu-ftpd. Red Hat 7.0 uses just such an implementation. This approach has the advantage of letting you add services by just creating a new configuration file for it. Modifying a service only involves editing its configuration file, not an entire xinetd.conf file.
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