Stop root from writing to directory Post: 303041316

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Top Forums UNIX for Advanced & Expert Users Stop root from writing to directory Post 303041316 by Neo on Thursday 21st of November 2019 09:14:29 AM

11-21-2019

Administrator

Quote:

Originally Posted by foad

....

The usual remedy if you want some file(-space) to be protected from roots tampering is to put it off the server: create an NFS share on some remote server, mount it where you want to be protected from roots access and adjust the rights accordingly. This is the common way of i.e. protecting logs from possible tampering.

Let me correct your words here.

This is not a "usual remedy", but it is one technical control in wide a range of possible technical controls based on the risk profile of the server.

I don't have a lot of time to write a long reply, so let me summarize:

Security is defined, generally, in three areas (1) confidentiality, (2) integrity and (3) availability.

The original poster has not defined which of these are the most critical to their organization / application / server.

For example, the application on this server may be less interested in file integrity than high availability. If that is the case, then having a network mounted device may not provide the insured availability because networks can fail, wires can break, network devices can go down, even unplugged, etc. In one datacenter I worked, I watched a major device fail because a manager rolled his chair (sitting in the chair) over a LAN cable while talking to the team.

Anyway, it is important, when talking about IT security to talk about the risk and define the risk profile; because what is correct for one application / server may not be the best for another; and the controls: (1) techincal,(2) administration and (3) physical.

More later, if this thread gains any traction.

Neo

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LEARN ABOUT OPENSOLARIS

dfmounts_nfs

dfmounts_nfs(1M)					  System Administration Commands					  dfmounts_nfs(1M)

NAME

       dfmounts_nfs - display mounted NFS resource information

SYNOPSIS

       dfmounts [-F nfs] [-h] [server]...

DESCRIPTION

       dfmounts  shows	the local resources shared through  NFS, along with the list of clients that have mounted the resource. The -F flag may be
       omitted if  NFS is the only file system type listed in the file	/etc/dfs/fstypes.

       dfmounts without options, displays all remote resources mounted on the local system, regardless of file system type.

       The output of dfmounts consists of an optional header line (suppressed with the -h flag) followed by a list of lines containing whitespace-
       separated fields.  For each resource, the fields are:

	 resource server pathname clients ...

       where

       resource    Does not apply to  NFS. Printed as a hyphen (-).

       server	   Specifies the system from which the resource was mounted.

       pathname    Specifies the pathname that must be given to the share(1M) command.

       clients	   Is a comma-separated list of systems that have mounted the resource.

OPTIONS

       -F nfs	 Specifies the nfs-FSType.

       -h	 Suppress header line in output.

       server	 Displays  information	about the resources mounted from each server, where server can be any system on the network.  If no server
		 is specified, the server is assumed to be the local system.

FILES

       /etc/dfs/fstypes

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWnfscu 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mount(1M), share(1M), unshare(1M), attributes(5)

SunOS 5.11							    6 Nov 2000							  dfmounts_nfs(1M)

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