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1.113.1 Configure and Manage Inetd, Xinetd, and Related Services Weight 1.113.1 Configure and manage inetd, xinetd, and related services Weight 4 1.113.1 Angus Lees Context Configure and manage inetd, xinetd, and Objective inetd, xinetd related services tcpwrappers Weight 4 xinetd License Of This Linux Professional Institute Certification — 102 Document Angus Lees [email protected] Geoffrey Robertson [email protected] Nick Urbanik [email protected] This document Licensed under GPL—see section 6 2005 July 1.113.1 Configure and manage Outline inetd, xinetd, and related services Weight 4 Angus Lees Context Objective inetd, xinetd tcpwrappers xinetd inetd.conf License Of This Context Document tcpwrappers Objective xinetd inetd, xinetd License Of This Document 1.113.1 Configure and manage Topic 113 Networking Services [24] inetd, xinetd, and Where we are up to related services Weight 4 Angus Lees Context Objective 1.113.1 Configure and manage inetd, xinetd, and inetd, xinetd related services [4] tcpwrappers xinetd 1.113.2 Operate and perform basic configuration of License Of This sendmail [4] Document 1.113.3 Operate and perform basic configuration of Apache [4] 1.113.4 Properly manage the NFS, smb, and nmb daemons [4] 1.113.5 Setup and configure basic DNS services [4] 1.113.7 Set up secure shell (OpenSSH) [4] 1.113.1 Configure and manage Description of Objective inetd, xinetd, and 1.113.1 Configure and manage inetd, xinetd, and related services related services Weight 4 Angus Lees Context Objective inetd, xinetd Candidates should be able to configure tcpwrappers which services are available through xinetd License Of This inetd, use tcpwrappers to allow or deny Document services on a host-by-host basis, manually start, stop, and restart internet services, configure basic network services including telnet and ftp. Set a service to run as another user instead of the default in inetd.conf. 1.113.1 Configure and manage Key files, terms, and utilities include: inetd, xinetd, and 1.113.1 Configure and manage inetd, xinetd, and related services related services Weight 4 /etc/inetd.conf — configuration file for the Angus Lees older inetd Context Objective /etc/hosts.allow — TCP Wrappers inetd, xinetd configuration file, consulted first tcpwrappers xinetd /etc/hosts.deny — TCP Wrappers License Of This configuration file, consulted second Document /etc/services — file mapping service names ↔ network ports /etc/xinetd.conf — configuration file for xinetd, which has built-in support for TCP Wrappers, so is now used more than inetd /etc/xinetd.log — a file that appears to exist only in LPI objectives, but see $ man 5 xinetd.log ←- 1.113.1 Configure and manage inetd/xinetd inetd, xinetd, and related services Weight 4 Angus Lees Context Objective inetd, xinetd I The internet “super-server” inetd.conf I A daemon which listens on many ports and fires off the tcpwrappers appropriate command to handle incoming requests xinetd License Of This I inetd is used in older/smaller systems Document I Controlled through /etc/inetd.conf I xinetd is an enhanced replacement I Controlled through /etc/xinetd.conf... I . and through individual files in directory /etc/xinetd.d/ 1.113.1 Configure and manage inetd, xinetd, and related services Weight 4 Angus Lees Context Objective Fields are: inetd, xinetd service_name sock_type proto flags user server_path args inetd.conf tcpwrappers # UW-IMAP server imap2 stream tcp nowait root /usr/sbin/tcpd /usr/sbin/imapd xinetd imap3 stream tcp nowait root /usr/sbin/tcpd /usr/sbin/imapd License Of This imaps stream tcp nowait root /usr/sbin/tcpd /usr/sbin/imapd Document # Exim mail server smtp stream tcp nowait mail /usr/sbin/exim exim -bs 1.113.1 Configure and manage inetd, xinetd, and related services Weight 4 Angus Lees Built-in services (often disabled) Context Objective echo stream tcp nowait root internal inetd, xinetd echo dgram udp wait root internal inetd.conf chargen stream tcp nowait root internal tcpwrappers chargen dgram udp wait root internal xinetd License Of This discard stream tcp nowait root internal Document discard dgram udp wait root internal daytime stream tcp nowait root internal daytime dgram udp wait root internal time stream tcp nowait root internal time dgram udp wait root internal 1.113.1 Configure and manage hosts.allow / hosts.deny inetd, xinetd, and “TCP Wrappers” aka tcpd related services Weight 4 Angus Lees Context Objective inetd, xinetd Manpage is hosts_access(5) tcpwrappers # /etc/hosts.allow xinetd License Of This sshd: ALL Document imapd: 10.0.6.19 ALL: 10.0.128.96/255.255.255.224 # /etc/hosts.deny #ALL: PARANOID ALL: ALL 1.113.1 Configure and manage xinetd inetd, xinetd, and related services Weight 4 inetd I Same function as Angus Lees I Has built-in support for TCP Wrappers, so is now used for Context inetd recent distributions instead of Objective I package management system (i.e., dpkg, rpm) drops a inetd, xinetd file into directory tcpwrappers /etc/xinetd.d/ instead of having to edit xinetd License Of This /etc/inetd.conf Document I Here is such a file for the exim mail server to run under xinetd: service smtp { socket_type = stream protocol = tcp wait = no user = mail server = /usr/sbin/exim server_args = -bs } 1.113.1 Configure and manage Topics Covered inetd, xinetd, and related services Weight 4 Angus Lees Context Context Objective inetd, xinetd Objective tcpwrappers xinetd License Of This inetd, xinetd Document inetd.conf tcpwrappers xinetd License Of This Document 1.113.1 Configure and manage License Of This Document inetd, xinetd, and related services Weight 4 Angus Lees Context Objective Copyright c 2005, 2003 Angus Lees <[email protected]>, inetd, xinetd tcpwrappers Geoffrey Robertson <[email protected]> and Nick Urbanik xinetd <[email protected]>. License Of This Permission is granted to make and distribute verbatim copies Document or modified versions of this document provided that this copyright notice and this permission notice are preserved on all copies under the terms of the GNU General Public License as published by the Free Software Foundation—either version 2 of the License or (at your option) any later version..
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