Download Linux on IBM @server zSeries and S/390: Best Security by International Business Machines Corporat PDF

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If required, the user must re-enter the user password. -l List the authorized commands for the user on the current host. Example 3-6 on page 42 illustrates the use of the -l option to list authorized commands. Chapter 3. 3 Command logging with sudo Commands executed under sudo are logged to syslog using the “local2” facility by default. All sudo commands are logged, both when successfully authenticated, and when authentication is denied. ” Example 3-7 shows example log messages generated for both successful and unsuccessful authentication.

Note: Although Internet services are typically disabled, most distributions include TCP_wrappers in the default /etc/inetd configuration file. Some sites might choose to enable specific Internet services (for example, to run an anonymous FTP server). In these cases, it is important to take precautions to minimize security exposures. A common facility to secure Internet services is TCP_wrappers. TCP_wrappers provide the ability to filter incoming connections from Internet services (such as FTP, Telnet, or SSH).

For Guest LANs, the SPECIAL statement is equivalent to performing the CP DEFINE NIC and COUPLE commands in order to connect the guest to a virtual network. The SPECIAL statement typically connects a virtual machine to a persistent Guest LAN. 7 Directory Maintenance Facility Maintaining the user directory can be simplified using the automation and command interface provided by the Directory Maintenance Facility (DirMaint). Every directory entry statement is implemented as a DirMaint command. Note: DirMaint is a separately licensed z/VM feature.

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