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Full Discussion: Login cancellation question
Top Forums UNIX for Beginners Questions & Answers Login cancellation question Post 302967153 by Huitzilopochtli on Saturday 20th of February 2016 01:26:09 AM
Old 02-20-2016
Login cancellation question

Purely out of curiosity, but what would happen in all accounts were locked out from being able to be logged in to?? The root account, on most unix-based systems, is locked by default. What if all other login-enabled accounts were changed to be login-disabled?? If such a thing were possible, would there be a possibility of using some way to gain control over the system without being able to login?? Or would the system and its contents be inaccessible?? This is pure curiosity. Obviously, I would never do this if it were possible.
 

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ttys(4) 						     Kernel Interfaces Manual							   ttys(4)

NAME
ttys - terminal control database file for trusted systems SYNOPSIS
DESCRIPTION
The system supports a single terminal control database containing entries for each local terminal that can log into the system. Authentica- tion programs use information contained in the terminal control database to determine if login from the terminal is permitted. Additional fields are maintained for informational purposes. The format of the terminal control database file is identical to other system authentication database files. For more information on the file format, see authcap(4). The file consists of keyword field identifiers and values for those fields. The keyword identifiers supported and their use include: This field defines the terminal device name for the entry. The terminal device is expected to be contained in the directory, therefore this prefix should not be specified. If the terminal entry describes the device, the field should contain This field records the user id of the last user to successfully login using the terminal device. This field records the last successful login time to the terminal device. This field records the last unsuccessful login time to the terminal device. This field records the number of consecutive unsuccessful login attempts to the terminal device. This field specifies the maximum number of consecutive unsuccessful login attempts permitted using the terminal before the terminal is locked. Once the terminal is locked, it must be unlocked by an authorized administrator. This field specifies the login timeout value (sec). This field specifies the delay between login tries (sec). This flag field indicates whether the terminal device has been administratively locked or not. This field is manipulated by authorized administrators only. EXAMPLES
The following is an example of a terminal control database entry: This entry is for the system console device, The most recent successful login session was for the user The entry records the system time for the current successful login and the time of the most recent unsuccessful login attempt. WARNINGS
Remote terminals (ptys) should not be added to the or databases. Device name formats treated as ptys by login are: where x is a letter, and y is a hex number where x is a letter, and y is a hex number HP-UX 11i Version 3 is the last release to support trusted systems functionality. AUTHOR
was developed by HP. FILES
Terminal control database file SEE ALSO
login(1), getprtcent(3), devassign(4), authcap(4), default(4). TO BE OBSOLETED ttys(4)
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