import fcntl
import sys
import tempfile
+import subprocess
# ensure we get messages out immediately, so they get in the samba logs,
# and don't get swallowed by a timeout
os.putenv('PYTHONUNBUFFERED', '1')
+# forcing GMT avoids a problem in some timezones with kerberos. Both MIT
+# heimdal can get mutual authentication errors due to the 24 second difference
+# between UTC and GMT when using some zone files (eg. the PDT zone from
+# the US)
+os.putenv("TZ", "GMT")
+
# Find right directory when running from source tree
sys.path.insert(0, "bin/python")
from ldb import SCOPE_BASE
from samba.auth import system_session
from samba.samdb import SamDB
+from samba.dcerpc import netlogon, winbind
samba.ensure_external_module("dns", "dnspython")
import dns.resolver as resolver
default_ttl = 900
+am_rodc = False
+error_count = 0
parser = optparse.OptionParser("samba_dnsupdate")
sambaopts = options.SambaOptions(parser)
parser.add_option_group(sambaopts)
parser.add_option_group(options.VersionOptions(parser))
parser.add_option("--verbose", action="store_true")
+parser.add_option("--all-names", action="store_true")
parser.add_option("--all-interfaces", action="store_true")
parser.add_option("--use-file", type="string", help="Use a file, rather than real DNS calls")
+parser.add_option("--update-list", type="string", help="Add DNS names from the given file")
+parser.add_option("--fail-immediately", action='store_true', help="Exit on first failure")
creds = None
ccachename = None
print "No IP interfaces - skipping DNS updates"
sys.exit(0)
-
+if opts.verbose:
+ print "IPs: %s" % IPs
########################################################
# get credentials if we haven't got them already
def get_credentials(lp):
- from samba.credentials import Credentials
+ from samba import credentials
global ccachename, creds
if creds is not None:
return
- creds = Credentials()
+ creds = credentials.Credentials()
creds.guess(lp)
- try:
- creds.set_machine_account(lp)
- except:
- print "Failed to set machine account"
- raise
-
+ creds.set_machine_account(lp)
+ creds.set_krb_forwardable(credentials.NO_KRB_FORWARDABLE)
(tmp_fd, ccachename) = tempfile.mkstemp()
creds.get_named_ccache(lp, ccachename)
self.existing_port = None
self.existing_weight = None
self.type = list[0]
- self.name = list[1]
+ self.name = list[1].lower()
if self.type == 'SRV':
- self.dest = list[2]
+ self.dest = list[2].lower()
self.port = list[3]
elif self.type == 'A':
self.ip = list[2] # usually $IP, which gets replaced
elif self.type == 'CNAME':
- self.dest = list[2]
+ self.dest = list[2].lower()
else:
print "Received unexpected DNS reply of type %s" % self.type
raise
except IOError:
return False
- line = dns_file.readline()
- while line:
- line = line.rstrip().lstrip()
- if line[0] == "#":
- line = dns_file.readline()
+ for line in dns_file:
+ line = line.strip()
+ if line == '' or line[0] == "#":
continue
if line.lower() == str(d).lower():
return True
- line = dns_file.readline()
return False
try:
###########################################
# get the list of substitution vars
def get_subst_vars():
- global lp
+ global lp, am_rodc
vars = {}
samdb = SamDB(url=lp.get("sam database"), session_info=system_session(),
- lp=lp)
+ lp=lp)
vars['DNSDOMAIN'] = lp.get('realm').lower()
+ vars['DNSFOREST'] = lp.get('realm').lower()
vars['HOSTNAME'] = lp.get('netbios name').lower() + "." + vars['DNSDOMAIN']
vars['NTDSGUID'] = samdb.get_ntds_GUID()
vars['SITE'] = samdb.server_site_name()
res = samdb.search(base=None, scope=SCOPE_BASE, attrs=["objectGUID"])
guid = samdb.schema_format_value("objectGUID", res[0]['objectGUID'][0])
vars['DOMAINGUID'] = guid
+ am_rodc = samdb.am_rodc()
+
return vars
fcntl.lockf(wfile, fcntl.LOCK_UN)
return
+ normalised_name = d.name.rstrip('.') + '.'
+
(tmp_fd, tmpfile) = tempfile.mkstemp()
f = os.fdopen(tmp_fd, 'w')
if d.type == "A":
- f.write("update add %s %u A %s\n" % (d.name, default_ttl, d.ip))
+ f.write("update add %s %u A %s\n" % (normalised_name, default_ttl, d.ip))
if d.type == "SRV":
if d.existing_port is not None:
- f.write("update delete %s SRV 0 %s %s %s\n" % (d.name, d.existing_weight,
+ f.write("update delete %s SRV 0 %s %s %s\n" % (normalised_name, d.existing_weight,
d.existing_port, d.dest))
- f.write("update add %s %u SRV 0 100 %s %s\n" % (d.name, default_ttl, d.port, d.dest))
+ f.write("update add %s %u SRV 0 100 %s %s\n" % (normalised_name, default_ttl, d.port, d.dest))
if d.type == "CNAME":
- f.write("update add %s %u CNAME %s\n" % (d.name, default_ttl, d.dest))
+ f.write("update add %s %u CNAME %s\n" % (normalised_name, default_ttl, d.dest))
if opts.verbose:
f.write("show\n")
f.write("send\n")
f.close()
os.putenv("KRB5CCNAME", ccachename)
- os.system("%s %s" % (nsupdate_cmd, tmpfile))
+ try:
+ cmd = "%s %s" % (nsupdate_cmd, tmpfile)
+ subprocess.check_call(cmd, shell=True)
+ except Exception, estr:
+ global error_count
+ if opts.fail_immediately:
+ sys.exit(1)
+ error_count = error_count + 1
+ if opts.verbose:
+ print("Failed nsupdate: %s : %s" % (str(d), estr))
os.unlink(tmpfile)
+
+def rodc_dns_update(d, t):
+ '''a single DNS update via the RODC netlogon call'''
+ global sub_vars
+
+ if opts.verbose:
+ print "Calling netlogon RODC update for %s" % d
+
+ typemap = {
+ netlogon.NlDnsLdapAtSite : netlogon.NlDnsInfoTypeNone,
+ netlogon.NlDnsGcAtSite : netlogon.NlDnsDomainNameAlias,
+ netlogon.NlDnsDsaCname : netlogon.NlDnsDomainNameAlias,
+ netlogon.NlDnsKdcAtSite : netlogon.NlDnsInfoTypeNone,
+ netlogon.NlDnsDcAtSite : netlogon.NlDnsInfoTypeNone,
+ netlogon.NlDnsRfc1510KdcAtSite : netlogon.NlDnsInfoTypeNone,
+ netlogon.NlDnsGenericGcAtSite : netlogon.NlDnsDomainNameAlias
+ }
+
+ w = winbind.winbind("irpc:winbind_server", lp)
+ dns_names = netlogon.NL_DNS_NAME_INFO_ARRAY()
+ dns_names.count = 1
+ name = netlogon.NL_DNS_NAME_INFO()
+ name.type = t
+ name.dns_domain_info_type = typemap[t]
+ name.priority = 0
+ name.weight = 0
+ if d.port is not None:
+ name.port = int(d.port)
+ name.dns_register = True
+ dns_names.names = [ name ]
+ site_name = sub_vars['SITE'].decode('utf-8')
+
+ global error_count
+
+ try:
+ ret_names = w.DsrUpdateReadOnlyServerDnsRecords(site_name, default_ttl, dns_names)
+ if ret_names.names[0].status != 0:
+ print("Failed to set DNS entry: %s (status %u)" % (d, ret_names.names[0].status))
+ error_count = error_count + 1
+ except RuntimeError, reason:
+ print("Error setting DNS entry of type %u: %s: %s" % (t, d, reason))
+ error_count = error_count + 1
+
+ if error_count != 0 and opts.fail_immediately:
+ sys.exit(1)
+
+
+def call_rodc_update(d):
+ '''RODCs need to use the netlogon API for nsupdate'''
+ global lp, sub_vars
+
+ # we expect failure for 3268 if we aren't a GC
+ if d.port is not None and int(d.port) == 3268:
+ return
+
+ # map the DNS request to a netlogon update type
+ map = {
+ netlogon.NlDnsLdapAtSite : '_ldap._tcp.${SITE}._sites.${DNSDOMAIN}',
+ netlogon.NlDnsGcAtSite : '_ldap._tcp.${SITE}._sites.gc._msdcs.${DNSDOMAIN}',
+ netlogon.NlDnsDsaCname : '${NTDSGUID}._msdcs.${DNSFOREST}',
+ netlogon.NlDnsKdcAtSite : '_kerberos._tcp.${SITE}._sites.dc._msdcs.${DNSDOMAIN}',
+ netlogon.NlDnsDcAtSite : '_ldap._tcp.${SITE}._sites.dc._msdcs.${DNSDOMAIN}',
+ netlogon.NlDnsRfc1510KdcAtSite : '_kerberos._tcp.${SITE}._sites.${DNSDOMAIN}',
+ netlogon.NlDnsGenericGcAtSite : '_gc._tcp.${SITE}._sites.${DNSFOREST}'
+ }
+
+ for t in map:
+ subname = samba.substitute_var(map[t], sub_vars)
+ if subname.lower() == d.name.lower():
+ # found a match - do the update
+ rodc_dns_update(d, t)
+ return
+ if opts.verbose:
+ print("Unable to map to netlogon DNS update: %s" % d)
+
+
# get the list of DNS entries we should have
-dns_update_list = lp.private_path('dns_update_list')
+if opts.update_list:
+ dns_update_list = opts.update_list
+else:
+ dns_update_list = lp.private_path('dns_update_list')
+
+# use our private krb5.conf to avoid problems with the wrong domain
+# bind9 nsupdate wants the default domain set
+krb5conf = lp.private_path('krb5.conf')
+os.putenv('KRB5_CONFIG', krb5conf)
file = open(dns_update_list, "r")
dns_list = []
# read each line, and check that the DNS name exists
-line = file.readline()
-while line:
- line = line.rstrip().lstrip()
- if line[0] == "#":
- line = file.readline()
+for line in file:
+ line = line.strip()
+ if line == '' or line[0] == "#":
continue
d = parse_dns_line(line, sub_vars)
dns_list.append(d)
- line = file.readline()
# now expand the entries, if any are A record with ip set to $IP
# then replace with multiple entries, one for each interface IP
if d.type == 'A' and d.ip == "$IP":
d.ip = IPs[0]
for i in range(len(IPs)-1):
- d2 = d
+ d2 = dnsobj(str(d))
d2.ip = IPs[i+1]
dns_list.append(d2)
# now check if the entries already exist on the DNS server
for d in dns_list:
- if not check_dns_name(d):
+ if opts.all_names or not check_dns_name(d):
update_list.append(d)
if len(update_list) == 0:
# ask nsupdate to add entries as needed
for d in update_list:
- call_nsupdate(d)
+ if am_rodc:
+ if d.name.lower() == domain.lower():
+ continue
+ if d.type != 'A':
+ call_rodc_update(d)
+ else:
+ call_nsupdate(d)
+ else:
+ call_nsupdate(d)
# delete the ccache if we created it
if ccachename is not None:
os.unlink(ccachename)
-
+if error_count != 0:
+ print("Failed update of %u entries" % error_count)
+sys.exit(error_count)
git.samba.org / samba.git / blobdiff