03-29-2008
For generic Unix, no. On a reasonably modern platform there may be attributes in the file system etc which would permit something like this, but you need to indicate what OS and file system you're on.
A classical arrangement is to put stuff inside a directory where users only have execute access, no read access; if they know the name of one of the directories in there, they can access them, but they have to be good at guessing. This is of course also very cumbersome for those who need full access.
It also depends on the usage scenario. Are we talking limited access, like anonymous ftp users, or friendly colored dancing icons with chocolate candy on a KDE desktop?
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LEARN ABOUT DEBIAN
pam_ftp
PAM_FTP(8) Linux-PAM Manual PAM_FTP(8)
NAME
pam_ftp - PAM module for anonymous access module
SYNOPSIS
pam_ftp.so [debug] [ignore] [users=XXX,YYY,...]
DESCRIPTION
pam_ftp is a PAM module which provides a pluggable anonymous ftp mode of access.
This module intercepts the user's name and password. If the name is ftp or anonymous, the user's password is broken up at the @ delimiter
into a PAM_RUSER and a PAM_RHOST part; these pam-items being set accordingly. The username (PAM_USER) is set to ftp. In this case the
module succeeds. Alternatively, the module sets the PAM_AUTHTOK item with the entered password and fails.
This module is not safe and easily spoofable.
OPTIONS
debug
Print debug information.
ignore
Pay no attention to the email address of the user (if supplied).
ftp=XXX,YYY,...
Instead of ftp or anonymous, provide anonymous login to the comma separated list of users: XXX,YYY,.... Should the applicant enter one
of these usernames the returned username is set to the first in the list: XXX.
MODULE TYPES PROVIDED
Only the auth module type is provided.
RETURN VALUES
PAM_SUCCESS
The authentication was successful.
PAM_USER_UNKNOWN
User not known.
EXAMPLES
Add the following line to /etc/pam.d/ftpd to handle ftp style anonymous login:
#
# ftpd; add ftp-specifics. These lines enable anonymous ftp over
# standard UN*X access (the listfile entry blocks access to
# users listed in /etc/ftpusers)
#
auth sufficient pam_ftp.so
auth required pam_unix.so use_first_pass
auth required pam_listfile.so
onerr=succeed item=user sense=deny file=/etc/ftpusers
SEE ALSO
pam.conf(5), pam.d(5), pam(7)
AUTHOR
pam_ftp was written by Andrew G. Morgan <morgan@kernel.org>.
Linux-PAM Manual 06/04/2011 PAM_FTP(8)