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#!/usr/bin/python2
import sys
import os
import random
import shutil
import tempfile
import argparse
import textwrap
try:
import ldap
except ImportError, e:
print "Please install python-ldap before running this program"
sys.exit(1)
basedn="<%= dc_suffix %>"
peopledn="ou=people,%s" % basedn
<%-
ldap_servers.map! { |l| "'ldaps://#{l}'" }
-%>
uris=[<%= ldap_servers.join(", ") %>]
random.shuffle(uris)
uri = " ".join(uris)
timeout=5
binddn="cn=<%= fqdn %>,ou=Hosts,%s" % basedn
ldap_secret_file="<%= ldap_pwfile %>"
nslcd_conf_file="<%= nslcd_conf_file %>"
# filter out disabled accounts also
# too bad uidNumber doesn't support >= filters
filter="(&(objectClass=inetOrgPerson)(objectClass=ldapPublicKey)(objectClass=posixAccount)(sshPublicKey=*))"
keypathprefix='/home'
parser = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
description=textwrap.dedent('''\
Will fetch all enabled user accounts under %s
with ssh keys in them and write each one to
%s/<login>/.ssh/authorized_keys
It will return failure when no keys are updated and success
when one or more keys have changed.
This script is intended to be run from cron as root;
''' % (peopledn, keypathprefix)))
parser.add_argument('-n', '--dry-run', action='store_true')
parser.add_argument('-v', '--verbose', action='store_true')
args = parser.parse_args()
def get_bindpw():
try:
return get_nslcd_bindpw(nslcd_conf_file)
except:
pass
try:
return get_ldap_secret(ldap_secret_file)
except:
pass
print "Error while reading password file, aborting"
sys.exit(1)
def get_nslcd_bindpw(pwfile):
try:
f = open(pwfile, 'r')
except IOError, e:
print "Error while reading nslcd file " + pwfile
print e
raise
pwfield = "bindpw"
for line in f:
ls = line.strip().split()
if len(ls) == 2 and ls[0] == pwfield:
f.close()
return ls[1]
f.close()
print "No " + pwfield + " field found in nslcd file " + pwfile
raise Exception()
def get_ldap_secret(pwfile):
try:
f = open(pwfile, 'r')
except IOError, e:
print "Error while reading password file " + pwfile
print e
raise
pw = f.readline().strip()
f.close()
return pw
def write_keys(keys, user, uid, gid):
keyfile = "%s/%s/.ssh/authorized_keys" % (keypathprefix,user)
fromldap = ''
for key in keys:
fromldap += key.strip() + "\n"
fromfile = ''
try:
f = open(keyfile, 'r')
fromfile = f.read()
f.close()
except:
pass
if fromldap == fromfile:
return False
if args.dry_run:
print "Would write %s" % keyfile
return True
if args.verbose:
print "Writing %s" % keyfile
if not os.path.isdir("%s/%s" % (keypathprefix,user)):
shutil.copytree('/etc/skel', "%s/%s" % (keypathprefix,user))
os.chown("%s/%s" % (keypathprefix,user), uid, gid)
for root, dirs, files in os.walk("%s/%s" % (keypathprefix,user)):
for d in dirs:
os.chown(os.path.join(root, d), uid, gid)
for f in files:
os.chown(os.path.join(root, f), uid, gid)
try:
os.makedirs("%s/%s/.ssh" % (keypathprefix,user), 0700)
except:
pass
os.chmod("%s/%s/.ssh" % (keypathprefix,user), 0700)
os.chown("%s/%s/.ssh" % (keypathprefix,user), uid, gid)
(fd, tmpname) = tempfile.mkstemp('', 'ldap-sshkey2file-')
os.write(fd, fromldap);
os.close(fd)
os.chmod(tmpname, 0600)
os.chown(tmpname, uid, gid)
shutil.move(tmpname, keyfile)
# Hmm, apparently shutil.move does not preserve user/group so lets reapply
# them. I still like doing it before as this should be more "automic"
# if it actually worked, so it's "good practice", even if shutil.move sucks
os.chown(keyfile, uid, gid)
os.chmod(keyfile, 0600)
return True
bindpw = get_bindpw()
changed = False
try:
ld = ldap.initialize(uri)
ld.set_option(ldap.OPT_NETWORK_TIMEOUT, timeout)
if uri.startswith("ldap:/"):
ld.start_tls_s()
ld.bind_s(binddn, bindpw)
res = ld.search_s(peopledn, ldap.SCOPE_ONELEVEL, filter, ['uid','sshPublicKey','uidNumber','gidNumber'])
try:
os.makedirs(keypathprefix, 0701)
except:
pass
if args.verbose:
print "Found users: " + ", ".join(sorted(map(lambda x: x[1]['uid'][0], res)))
for result in res:
dn, entry = result
# skip possible system users
if 'uidNumber' not in entry or int(entry['uidNumber'][0]) < 500:
continue
if write_keys(entry['sshPublicKey'], entry['uid'][0], int(entry['uidNumber'][0]), int(entry['gidNumber'][0])):
changed = True
ld.unbind_s()
except Exception, e:
print "Error"
raise
if changed:
if args.verbose:
print "SSH keys changed"
sys.exit(0)
if args.verbose:
print "No changes in SSH keys"
sys.exit(1)
# vim:ts=4:sw=4:et:ai:si
|
