Check permissions on netrc file

The netrc.netrc class from the Python standard library applies access safety checks (requiring that the netrc file is readable only by the current user, and not by group members or other users) only if using the netrc file in the default location (~/.netrc). This subclass applies the same access safety checks regardless of the path to the netrc file.

bin/lvalert_admin

@@ -17,11 +17,8 @@
 # along with lvalert.  If not, see <http://www.gnu.org/licenses/>.
 
 from __future__ import print_function
-import netrc
-import sys
 import os
 import time
-import select
 import logging
 import libxml2
 import getpass
@@ -32,6 +29,7 @@ from M2Crypto.SSL import Context
 # pubsub import must come first because it overloads part of the
 # StanzaProcessor class
 from ligo.lvalert import pubsub
+from ligo.lvalert.utils import safe_netrc
 
 from pyxmpp.all import JID,Iq,Presence,Message,StreamError,TLSSettings
 from pyxmpp.jabber.all import Client
@@ -150,8 +148,8 @@ if (opts.add_publisher or opts.create or opts.delete or opts.subscribe or opts.u
     parser.error("--node must be provided")
 
 try:
-    default_username, _, default_password = netrc.netrc(os.path.expanduser(opts.netrc)).authenticators(opts.server)
-except:
+    default_username, _, default_password = safe_netrc(os.path.expanduser(opts.netrc)).authenticators(opts.server)
+except IOError:
     default_username, default_password = None, None
 
 myusername = opts.username or default_username