09-06-2010
Short answer: No.
Long answer: Unless they have a very very simple password, no.
UNIX does not save the passwords in plain text for obvious security reasons, but hashes them using a salt. For authentications the supplied password is also hashed, and the hashes are compared. If it's a very simple password one could use
John the Ripper to crack it, but that's about it. Short of just asking the user that is.
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LEARN ABOUT CENTOS
dialups
dialups(4) File Formats dialups(4)
NAME
dialups - list of terminal devices requiring a dial-up password
SYNOPSIS
/etc/dialups
DESCRIPTION
dialups is an ASCII file which contains a list of terminal devices that require a dial-up password. A dial-up password is an additional
password required of users who access the computer through a modem or dial-up port. The correct password must be entered before the user
is granted access to the computer. The set of ports that require a dial-up password are listed in the dialups file.
Each entry in the dialups file is a single line of the form:
terminal-device
where
terminal-device The full path name of the terminal device that will require a dial-up password for users accessing the computer
through a modem or dial-up port.
The dialups file should be owned by the root user and the root group. The file should have read and write permissions for the owner (root)
only.
EXAMPLES
Example 1: A sample dialups file.
Here is a sample dialups file:
/dev/term/a
/dev/term/b
/dev/term/c
FILES
/etc/d_passwd dial-up password file
/etc/dialups list of dial-up ports requiring dial-up passwords
SEE ALSO
d_passwd(4)
SunOS 5.10 4 May 1994 dialups(4)