FTPUSERS(5) Linux Programmer's Manual FTPUSERS(5)NAME
ftpusers - list of users that may not log in via the FTP daemon
DESCRIPTION
The text file ftpusers contains a list of users that may not log in using the File Transfer Protocol (FTP) server daemon. This file is
used not merely for system administration purposes but for improving security within a TCP/IP networked environment. It will typically
contain a list of the users that either have no business using ftp or have too many privileges to be allowed to log in through the FTP
server daemon. Such users usually include root, daemon, bin, uucp, and news. If your FTP server daemon doesn't use ftpusers then it is
suggested that you read its documentation to find out how to block access for certain users. Washington University FTP server Daemon
(wuftpd) and Professional FTP Daemon (proftpd) are known to make use of ftpusers.
Format
The format of ftpusers is very simple. There is one account name (or username) per line. Lines starting with a # are ignored.
FILES
/etc/ftpusers
SEE ALSO passwd(5), proftpd(8), wuftpd(8)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2000-08-27 FTPUSERS(5)
Check Out this Related Man Page
FTPUSERS(5) BSD File Formats Manual FTPUSERS(5)NAME
ftpusers, ftpchroot --ftpd(8) access control file
DESCRIPTION
The ftpusers file provides user access control for ftpd(8) by defining which users may login.
If the ftpusers file does not exist, all users are denied access.
A ``'' is the escape character; it can be used to escape the meaning of the comment character, or if it is the last character on a line,
extends a configuration directive across multiple lines. A ``#'' is the comment character, and all characters from it to the end of line are
ignored (unless it is escaped with the escape character).
The syntax of each line is:
userglob[:groupglob][@host] [directive [class]]
These elements are:
userglob matched against the user name, using fnmatch(3) glob matching (e.g, 'f*').
groupglob matched against all the groups that the user is a member of, using fnmatch(3) glob matching (e.g, '*src').
host either a CIDR address (refer to inet_net_pton(3)) to match against the remote address (e.g, '1.2.3.4/24'), or an fnmatch(3)
glob to match against the remote hostname (e.g, '*.NetBSD.org').
directive If ``allow'' or ``yes'' the user is allowed access. If ``deny'' or ``no'', or directive is not given, the user is denied
access.
class defines the class to use in ftpd.conf(5).
If class is not given, it defaults to one of the following:
chroot If there is a match in /etc/ftpchroot for the user.
guest If the user name is ``anonymous'' or 'ftp'.
real If neither of the above is true.
No further comparisons are attempted after the first successful match. If no match is found, the user is granted access. This syntax is
backward-compatible with the old syntax.
If a user requests a guest login, the ftpd(8) server checks to see that both ``anonymous'' and ``ftp'' have access, so if you deny all users
by default, you will need to add both ``anonymous allow'' and ``ftp allow'' to /etc/ftpusers in order to allow guest logins.
/etc/ftpchroot
The file /etc/ftpchroot is used to determine which users will have their session's root directory changed (using chroot(2)), either to the
directory specified in the ftpd.conf(5) chroot directive (if set), or to the home directory of the user. If the file does not exist, the
root directory change is not performed.
The syntax is similar to ftpusers, except that the class argument is ignored. If there's a positive match, the session's root directory is
changed. No further comparisons are attempted after the first successful match. This syntax is backward-compatible with the old syntax.
FILES
/etc/ftpchroot List of normal users who should have their ftp session's root directory changed by using chroot(2).
/etc/ftpusers This file.
/usr/share/examples/ftpd/ftpusers A sample ftpusers file.
SEE ALSO fnmatch(3), inet_net_pton(3), ftpd.conf(5), ftpd(8)BSD July 17, 2000 BSD