09-01-2017
Do not mess with PAM unless you are in easy driving distance of the system, have a rescue CD and the technical know-how to fix it by hand. Even then, give it a couple of second thoughts. The risks of altering PAM are very high. You can easily render your system unbootable, un-login-able, or open security holes you could only discover by accident (or intentional intrusion).
Why do you need to change users after an FTP login? Why not login as the user you wanted to login as in the first place?
Why do you need to use FTP at all?
Explain your problem in more detail and we can probably find better solutions.
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LEARN ABOUT LINUX
pam_lastlog
PAM_LASTLOG(8) Linux-PAM Manual PAM_LASTLOG(8)
NAME
pam_lastlog - PAM module to display date of last login
SYNOPSIS
pam_lastlog.so [debug] [silent] [never] [nodate] [nohost] [noterm] [nowtmp] [noupdate] [showfailed]
DESCRIPTION
pam_lastlog is a PAM module to display a line of information about the last login of the user. In addition, the module maintains the
/var/log/lastlog file.
Some applications may perform this function themselves. In such cases, this module is not necessary.
OPTIONS
debug
Print debug information.
silent
Don't inform the user about any previous login, just update the /var/log/lastlog file.
never
If the /var/log/lastlog file does not contain any old entries for the user, indicate that the user has never previously logged in with
a welcome message.
nodate
Don't display the date of the last login.
noterm
Don't display the terminal name on which the last login was attempted.
nohost
Don't indicate from which host the last login was attempted.
nowtmp
Don't update the wtmp entry.
noupdate
Don't update any file.
showfailed
Display number of failed login attempts and the date of the last failed attempt from btmp. The date is not displayed when nodate is
specified.
MODULE TYPES PROVIDED
Only the session module type is provided.
RETURN VALUES
PAM_SUCCESS
Everything was successful.
PAM_SERVICE_ERR
Internal service module error.
PAM_USER_UNKNOWN
User not known.
EXAMPLES
Add the following line to /etc/pam.d/login to display the last login time of an user:
session required pam_lastlog.so nowtmp
FILES
/var/log/lastlog
Lastlog logging file
SEE ALSO
pam.conf(5), pam.d(5), pam(7)
AUTHOR
pam_lastlog was written by Andrew G. Morgan <morgan@kernel.org>.
Linux-PAM Manual 06/04/2011 PAM_LASTLOG(8)