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Creation Code 3/9 in Software # service xinetd stop # service xinetd start # service xinetd restart

# service xinetd stop # service xinetd start # service xinetd restart
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xinetd Configuration: xinetdconf
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The xinetdconf file contains settings for your xinetd server, such as logging and security attributes (see Table 21-7 later in this chapter) This file can also contain server configuration entries, or they may be placed into separate configuration files located in the /etc/xinetdd directory The includedir attribute specifies this directory:
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includedir /etc/xinetdd
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Logging xinetd Services
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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 logs the duration (DURATION) and the user ID (USERID) for connections to a service, log_on_failure logs the users that failed to connect, and nice sets the priority of the service to 10
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log_on_success += DURATION USERID log_on_failure += USERID nice = 10
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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),
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21:
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log_on_success specifies information to be logged when connections are made, and log_ on_failure specifies information to be logged when they fail
log_type = SYSLOG daemon info log_on_failure = HOST log_on_success = PID HOST EXIT
xinetd Network Security
For security restrictions, you can use only_from to restrict access by certain remote hosts The no_access attribute denies access from the listed hosts, but no others These controls take IP addresses as their values You can list individual IP addresses, a range of IP addresses, or a network, using the network address The instances attribute limits the number of server processes that can be active at once for a particular service The following examples restrict access to a local network 19216810 and the localhost, deny access from 192168115, and use the instances attribute to limit the number of server processes at one time to 60
only_from only_from no_access instances = = = = 19216810 localhost 192168115 60
The xinetd program also provides several internal services, including time, services, servers, and xadmin: services provides a list of currently active services, and servers provides information about servers; xadmin provides xinetd administrative support
xinetd Service Configuration Files: /etc/xinetdd Directory
Instead of having one large xinetdconf file for all services, the service configurations are split it into several configuration files, one for each service The directory is specified in xinetdconf file with an includedir option In the following example, the xinetdd directory holds xinetd configuration files for services like SWAT This approach has the advantage of letting you add services by just creating a new configuration file for them Modifying a service involves editing only its configuration file, not an entire xinetdconf file As an example, the swat file in the xinetdd directory is shown here Notice that it is disabled by default:
# default: off # description: SWAT is the Samba Web Admin Tool\ # Use swat to configure your Samba server \ # To use SWAT, connect to port 901 with your \ # favorite web browser service swat { port = 901 socket_type = stream wait = no only_from = 127001 user = root server = /usr/sbin/swat log_on_failure += USERID disable yes }
PART VI
Part VI:
Internet and Network Services
Configuring Services: xinetd Attributes
Entries in an xinetd service file define the server to be activated when requested along with any options and security precautions An entry consists of a block of attributes defined for different features, such as the name of the server program, the protocol used, and security restrictions Each block for an Internet service such as a server is preceded by the keyword service and the name by which you want to identify the service A pair of braces encloses the block of attributes Each attribute entry begins with the attribute name, followed by an assignment operator, such as =, and then the value or values assigned A special block specified by the keyword default contains default attributes for services The syntax is shown here:
service <service_name> { <attribute> <assign_op> <value> <value> }
Most attributes take a single value for which you use the standard assignment operator,
= Some attributes can take a list of values You can assign values with the = operator, but you can also add or remove items from these lists with the += and -= operators Use += to add values and -= to remove values You often use the += and -= operators to add values to
attributes that may have an initial value assigned in the default block Attributes are listed in Table 21-7 Certain attributes are required for a service These include socket_type and wait For a standard Internet service, you also need to provide the user (user ID for the service), the server (name of the server program), and the protocol (protocol used by the server) With server_args, you can also list any arguments you want passed to the server program (this does not include the server name) If protocol is not defined, the default protocol for the service is used
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