Special Edition Using Linux, Fourth Edition:Improving System Security
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Enabling Dial-Up Passwords
If you want to limit who can dial in and connect, dial-up passwords allow you to control who accesses the systems remotely. To enable the use of dial-up passwords, you must examine the file /etc/login.defs and see that DIALUPS_CHECK_ENAB is set to Yes.
Two files contain the dial-up information:
• /etc/dialups contains the ttys (one per line, with the leading “/dev/” removed). If a tty is listed, dial-up checks are performed.
• /etc/d_passwd contains the fully qualified path name of a shell, followed by an optional password.
If a user logs into a line that is listed in /etc/dialups and his shell is listed in the file /etc/d_passwd, he will be allowed access only by entering the correct dial-up password.
The command dpasswd assigns passwords to the shells in the /etc/d_passwd file.
From Here…
You can find more information about security issues in the following chapters:
• Chapter 10, “Managing User Accounts,” discusses the issues relating to creating and maintaining user accounts on Linux.
• Chapter 11, “Backing Up Data,” describes how to set up and maintain backups of your system.
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