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#!/usr/bin/env python
''' Sample externpasscheck script for use with voicemail.conf
Copyright (C) 2010, Digium, Inc.
Russell Bryant <russell@digium.com>
The externpasscheck option in voicemail.conf allows an external script to
validate passwords when a user is changing it. The script can enforce password
strength rules. This script is an example of doing so and implements a check
on password length, a password with too many identical consecutive numbers, or
a password made up of sequential digits.
'''
import sys
import re
# Set this to the required minimum length for a password
REQUIRED_LENGTH = 6
# Regular expressions that match against invalid passwords
REGEX_BLACKLIST = [
("(?P<digit>\d)(?P=digit){%d}" % (REQUIRED_LENGTH - 1),
"%d consective numbers that are the same" % REQUIRED_LENGTH)
]
# Exact passwords that are forbidden. If the string of digits specified here
# is found in any part of the password specified, it is considered invalid.
PW_BLACKLIST = [
"123456",
"234567",
"345678",
"456789",
"567890",
"098765",
"987654",
"876543",
"765432",
"654321"
]
mailbox, context, old_pw, new_pw = sys.argv[1:5]
# Enforce a password length of at least 6 characters
if len(new_pw) < REQUIRED_LENGTH:
print "INVALID: Password is too short (%d) - must be at least %d" % \
(len(new_pw), REQUIRED_LENGTH)
sys.exit(0)
for regex, error in REGEX_BLACKLIST:
if re.search(regex, new_pw):
print "INVALID: %s" % error
sys.exit(0)
for pw in PW_BLACKLIST:
if new_pw.find(pw) != -1:
print "INVALID: %s is forbidden in a password" % pw
sys.exit(0)
print "VALID"
sys.exit(0)