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Full Discussion: Using the encrypted password of the shadow file
Top Forums UNIX for Dummies Questions & Answers Using the encrypted password of the shadow file Post 302818013 by alister on Thursday 6th of June 2013 09:10:33 PM
Old 06-06-2013
Quote:
Originally Posted by SkySmart
yeah file permission setting is completely out of the equation since everyone has root here. that's out of my control. but what is under my control is making sure script is inoperable unless the proper password is written.
If everyone has root, then why bother? If everyone has root, any countermeasure can be undermined and neither security nor accountability are a priority.

So, obviously, this system is insecure. That may acceptable; we don't know any of the particulars. If you explain what you are to trying to accomplish, instead of asking how to implement what you think is the solution, we may be able to provide useful advice.

As it stands, what you have asked is nonsensical. How can you use the shadow file to defend against an attacker who has permission to modify the shadow file?

Regards,
Alister

P.S. With regard to authenticating using the shadow file, it can be done using whatever interfaces your system provides to login, nagios, etc (my UNIX doesn't have a shadow file).
Last edited by alister; 06-06-2013 at 10:24 PM..
 

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LEARN ABOUT OPENSOLARIS

ftpusers

ftpusers(4)							   File Formats 						       ftpusers(4)

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(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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