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ftpusers(5) [centos man page]

FTPUSERS(5)						     Linux Programmer's Manual						       FTPUSERS(5)

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 Linux 2000-08-27 FTPUSERS(5)

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ftpusers(4)							   File Formats 						       ftpusers(4)

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(1M), 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(4). 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 iden- tity. 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(4), no login can be per- formed. If a site adds similar administrative or system application identities in passwd(4) and shadow(4), 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(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWftpr | +-----------------------------+-----------------------------+ |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), in.ftpd(1M), ftpaccess(4), ftphosts(4), passwd(4), shadow(4), attributes(5), environ(5) SunOS 5.11 1 May 2003 ftpusers(4)

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