D_PASSWD(5) File Formats and Configurations D_PASSWD(5)
NAME
d_passwd - dial-up password file
SYNOPSIS
/etc/d_passwdDESCRIPTION
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.
d_passwd is an
ASCII file which contains a list of executable
programs (typically shells) that require a dial-up password and the
associated encrypted passwords. When a user attempts to log in on any
of the ports listed in the
dialups file (see
dialups(5)), the login
program looks at the user's login entry stored in the
passwd file
(see
passwd(5)), and compares the login shell field to the entries in
d_passwd. These entries determine whether the user will be required
to supply a dial-up password.
Each entry in
d_passwd is a single line of the form:
login-shell:password: where
login-shell The name of the login program that will require an
additional dial-up password.
password An encrypted password. Users accessing the computer
through a dial-up port or modem using
login-shell will be required to enter this password before gaining
access to the computer.
d_passwd should be owned by the
root user and the
root group. The
file should have read and write permissions for the owner (
root)
only.
If the user's login program in the
passwd file is not found in
d_passwd or if the login shell field in
passwd is empty, the user
must supply the default password. The default password is the entry
for
/usr/bin/sh. If
d_passwd has no entry for
/usr/bin/sh, then those
users whose login shell field in
passwd is empty or does not match
any entry in
d_passwd will not be prompted for a dial-up password.
Dial-up logins are disabled if
d_passwd has only the following entry:
/usr/bin/sh:*:
EXAMPLES
Example 1: Sample d_passwd file.
Here is a sample
d_passwd file:
/usr/lib/uucp/uucico:q.mJzTnu8icF0:
/usr/bin/csh:6k/7KCFRPNVXg:
/usr/bin/ksh:9df/FDf.4jkRt:
/usr/bin/sh:41FuGVzGcDJlw:
Generating An Encrypted Password
The
passwd (see
passwd(1)) utility can be used to generate the
encrypted password for each login program.
passwd generates encrypted
passwords for users and places the password in the
shadow (see
shadow(5)) file. Passwords for the
d_passwd file will need to be
generated by first adding a temporary user id using
useradd (see
useradd(8)), and then using
passwd(1) to generate the desired
password in the
shadow file. Once the encrypted version of the
password has been created, it can be copied to the
d_passwd file.
For example:
1. Type
useradd tempuser and press Return. This creates a
user named
tempuser.
2. Type
passwd tempuser and press Return. This creates an
encrypted password for
tempuser and places it in the
shadow file.
3. Find the entry for
tempuser in the
shadow file and copy
the encrypted password to the desired entry in the
d_passwd file.
4. Type
userdel tempuser and press Return to delete
tempuser.
These steps must be executed as the
root user.
FILES
/etc/d_passwd dial-up password file
/etc/dialups list of dial-up ports requiring dial-up passwords
/etc/passwd password file
/etc/shadow shadow password file
SEE ALSO
passwd(1),
dialups(5),
passwd(5),
shadow(5),
useradd(8)WARNINGS
When creating a new dial-up password, be sure to remain logged in on
at least one terminal while testing the new password. This ensures
that there is an available terminal from which you can correct any
mistakes that were made when the new password was added.
September 2, 2004 D_PASSWD(5)