FTPUSERS(5) File Formats and Configurations FTPUSERS(5)

NAME

ftpusers - file listing users to be disallowed ftp login privileges

SYNOPSIS

/etc/ftpd/ftpusers

DESCRIPTION

The ftpusers file lists users for whom ftp login privileges are
disallowed. Each ftpuser entry is a single line of the form:

name


where name is the user's login name.


The FTP Server, in.ftpd(8), reads the ftpusers file. If the login
name of the user matches one of the entries listed, it rejects the
login attempt.


The ftpusers file has the following default configuration entries:

root
daemon
bin
sys
adm
lp
uccp
nuucp
smmsp
listen
nobody
noaccess
nobody4


These entries match the default instantiated entries from passwd(5).
The list of default entries typically contains the superuser root and
other administrative and system application identities.


The root entry is included in the ftpusers file as a security measure
since the default policy is to disallow remote logins for this
identity. This policy is also set in the default value of the CONSOLE
entry in the /etc/default/login file. See login(1). If you allow root
login privileges by deleting the root entry in ftpusers, you should
also modify the security policy in /etc/default/login to reflect the
site security policy for remote login access by root.


Other default entries are administrative identities that are
typically assumed by system applications but never used for local or
remote login, for example sys and nobody. Since these entries do not
have a valid password field instantiated in shadow(5), no login can
be performed.


If a site adds similar administrative or system application
identities in passwd(5) and shadow(5), for example, majordomo, the
site should consider including them in the ftpusers file for a
consistent security policy.


Lines that begin with # are treated as comment lines and are ignored.

FILES

/etc/ftpd/ftpusers
A file that lists users for whom ftp login
privileges are disallowed.


/etc/ftpusers
See /etc/ftpd/ftpusers. This file is
deprecated, although its use is still
supported.


/etc/default/login


/etc/passwd
password file


/etc/shadow
shadow password file

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | See below. |
+--------------------+-----------------+


The interface stability for /etc/ftpd/ftpusers is Volatile. The
interface stability for /etc/ftpusers is (Obsolete).

SEE ALSO

login(1), ftphosts(5), passwd(5), shadow(5), attributes(7),
environ(7)

May 1, 2003 FTPUSERS(5)