Manual Pages for UNIX Operating System command usage for man d_passwd

File Formats                                          d_passwd(4)



NAME
     d_passwd - dial-up password file

SYNOPSIS
     /etc/d_passwd


DESCRIPTION
     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  execut-
     able  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(4)), the login program looks at the user's
     login  entry  stored in the passwd file (see passwd(4)), 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.






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File Formats                                          d_passwd(4)



     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 pass-
     word  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 follow-
     ing 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 gen-
     erates encrypted passwords for users and places the password
     in  the  shadow  (see  shadow(4))  file.  Passwords  for the
     d_passwd file will need to be generated by  first  adding  a
     temporary  user id using useradd (see useradd(1M)), and then
     using passwd(1) to generate the desired password in the sha-
     dow  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



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File Formats                                          d_passwd(4)



              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), useradd(1M), dialups(4), passwd(4), shadow(4)

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.























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