From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <3FD0AB5C.4030103@redhat.com>
Date: Fri, 05 Dec 2003 10:59:24 -0500
From: Daniel J Walsh <dwalsh@redhat.com>
MIME-Version: 1.0
To: SELinux <SELinux@tycho.nsa.gov>
Subject: relabel python script.
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Sender: owner-selinux@tycho.nsa.gov
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The attached script is something I wrote to handle the problem of 
labeling users home directories.  Russell's latest policy has added 
several security contexts to files in the users home directories (.ssh, 
.pgp, .xauthority etc).  The problem is the current 'make label' labels 
all entries in the users home directory with user_*_t.  If you define a 
certain user at staff_t (required by policy if you want to become 
sysadm_t) by default he will not be able to login.

This script figures out the default role for all users and then if the 
user is not root and the default role is not user_u, it adds entries to 
file_contexts to properly label this users home directories.  The script 
then runs a make relabel.

This functionality should probably be added to either seuser or make 
relabel to make this easier to do. 

Ideas?

Dan

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#!/usr/bin/python
import commands
import sys
import os

policy_dir="/etc/security/selinux/src/policy"
context_dir="%s/file_contexts" % policy_dir

def makeFileContext():
	rc=commands.getstatusoutput("cd %s;rm file_contexts/file_contexts; make file_contexts/file_contexts" % policy_dir)
	if rc[0] != 0:
		raise ValueError, rc[1]
def makeRelabel():
	rc=commands.getstatusoutput("cd %s;make relabel" % policy_dir)
	if rc[0] != 0:
		raise ValueError, rc[1]
	
def getUsers():
	rc=commands.getstatusoutput("seuser show users")
	udict={}
	if rc[0] == 0:
		ulist=rc[1].strip().split("\n")
		for u in ulist:
			user=u.split(":")
			if user[0]=="root" or user[0]=="user_u" or user[0]=="system_u":
				continue
			role = user[1].split()[0].split("_r")[0]
			if role == "user":
				continue
			udict[user[0]]=role
	return udict

def usage():
	print "Usage: %s" % sys.argv[0]
	sys.exit(1)
	
def update(user, role):
	rc=commands.getstatusoutput("cd %s; grep -h '/home/\[\^' file_contexts | grep -v vmware | sed 's|/home/\[\^\/\]+|/home/%s|g' | sed 's/user/%s/' > /tmp/user_context.tmp; cat /tmp/user_context.tmp >> file_contexts; rm /tmp/user_context.tmp" % (context_dir,user, role))
	if rc[0] != 0:
		print rc[1]
		sys.exit(1)
	return rc

try:
	makeFileContext()
	users=getUsers()
	for u in users.keys():
		update (u, users[u])

       	makeRelabel()
except ValueError, error:
	print error
	

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