Rebuilding bash source Post: 303006765

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Top Forums UNIX for Advanced & Expert Users Rebuilding bash source Post 303006765 by jim mcnamara on Tuesday 7th of November 2017 12:41:34 PM

11-07-2017

Registered User

I am guessing developers are recompiling some of their environment. You cannot hope to fix this.

If there actually is a completely defined standard environment:
1. use a shebang on all of your code
2. make sure /bin/sh is /bin/bash and /bin/bash has the correct checksum
3. examine and look for LD_PRELOAD settings, or any BASH environment variables

Basically what I see is a big problem. Management should explicitly disallow recompiling/rebuilding system code. The security issues are major here. This is like a hacker free for all, and you are trying to play referee.

Who owns a user's desktop Linux box? The company. Get management buy in and when something fails checksums or some other tests, contact management. If management thinks having folks do stuff like this is okay, then work at getting responsibility for solving script problems foist onto non-conforming users.

In other words do not try to "fix" the code problem, fix the cause instead.

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endusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

	 /bin/bash		    /bin/csh
	 /bin/jsh		    /bin/ksh
	 /bin/ksh93		    /bin/pfcsh
	 /bin/pfksh		    /bin/pfsh
	 /bin/sh		    /bin/tcsh
	 /bin/zsh		    /sbin/jsh
	 /sbin/pfsh		    /sbin/sh
	 /usr/bin/bash		    /usr/bin/csh
	 /usr/bin/jsh		    /usr/bin/ksh
	 /usr/bin/ksh93 	    /usr/bin/pfcsh
	 /usr/bin/pfksh 	    /usr/bin/pfsh
	 /usr/bin/sh		    /usr/bin/tcsh
	 /usr/bin/zsh		    /usr/sfw/bin/zsh
	 /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

NOTES

       Restricted shells should not be listed in /etc/shells.

SunOS 5.11							    1 Nov 2007							  getusershell(3C)