FTPUSERS(5) Standards, Environments, and Macros 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)