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Special Forums Cybersecurity One accout for FTP other to TELNET Post 23757 by Perderabo on Friday 28th of June 2002 10:36:47 AM
Old 06-28-2002
Yes just add the user to /etc/ftpd/ftpusers.

Yes in /etc/passwd, make the last field be /usr/bin/true:

uftp:x:123:456:ftp only user:/home/uftp:/usr/bin/true

And yes, add
/usr/bin/true
to /etc/shells.

If /etc/shell does not exist, you must create it and add a line for all possible shells. ftpd will check this file and will kick out anyone whose shell is not in this file.
 

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ftpusers(4)															       ftpusers(4)

NAME
ftpusers - file listing users to be disallowed ftp login privileges SYNOPSIS
/etc/ftpd/ftpusers 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. /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 See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWftpr | +-----------------------------+-----------------------------+ |Interface Stability |External | | | | | /etc/ftpd/ftpusers | | +-----------------------------+-----------------------------+ |Interface Stability |Obsolete | | | | | /etc/ftpusers | | +-----------------------------+-----------------------------+ login(1), in.ftpd(1M), ftpaccess(4), ftphosts(4), passwd(4), shadow(4), attributes(5), environ(5) 1 May 2003 ftpusers(4)
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