Network Services 139 system to access Red Hat Linux filesystems as network shares. Passwords may be encrypted, but algorithm is weak. is not sensitive. https 443 Secure Web server. Httpd Depends on server configuration. Only if Web server needs to run on system. Ipd 515 Print Daemon. Allows remote machines to send print jobs to our printers. LPRng or cups Weak. Information passed over network without encryption. Only run if your system has printers you want to share. rsh/rlogin 514 Allows remote system to access command line shell on local machine without supplying a password. rsh-server Weak. Relies on DNS (Domain Name Service) to identify remote system, so vulnerable if DNS compromised. No. nfs 2049 (requires portmapper to be listening on port 111) Network File System. Allows other systems to access file systems remotely. nfs-utils Weak. Information passed over network without encryption. Only use to access information that is not sensitive. Having decided which services are required, we need to make sure they are started, and make sure that any of the undesirable services are stopped. This is done through the Red Hat Service Configuration application. As an example, we’ll use the Red Hat Service Configuration application to turn off the lpd and portmapper services since our theoretical demonstration machine doesn’t have any printers attached to it (so there’s no point in running lpd), and we’re not using NFS or NIS (so there’s no point in running portmapper). Try it Out: Running the Service Configuration Application 1. Start the Service Configuration application by choosing Main Menu | System Settings | Server Settings | Services, or typing redhat-config-services at the command prompt. 2. If you’re not logged on as root (and you shouldn’t be!), you’ll be prompted for the root password in this dialog: 3. Now the services configuration menu appears: 417
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