from k5test import *

# Create a pair of realms, where KRBTEST1.COM can authenticate to
# REFREALM and has a domain-realm mapping for 'd' pointing to it.
drealm = {'domain_realm': {'d': 'REFREALM'}}
realm, refrealm = cross_realms(2, xtgts=((0,1),),
                               args=({'kdc_conf': drealm},
                                     {'realm': 'REFREALM',
                                      'create_user': False}),
                               create_host=False)
refrealm.addprinc('a/x.d')

savefile = os.path.join(realm.testdir, 'ccache.copy')
os.rename(realm.ccache, savefile)

# Get credentials and check that we got a referral to REFREALM.
def testref(realm, nametype):
    shutil.copyfile(savefile, realm.ccache)
    realm.run(['./gcred', nametype, 'a/x.d@'])
    out = realm.run([klist]).split('\n')
    if len(out) != 8:
        fail('unexpected number of lines in klist output')
    if out[5].split()[4] != 'a/x.d@' or out[6].split()[2] != 'a/x.d@REFREALM':
        fail('unexpected service principals in klist output')

# Get credentials and check that we get an error, not a referral.
def testfail(realm, nametype):
    shutil.copyfile(savefile, realm.ccache)
    realm.run(['./gcred', nametype, 'a/x.d@'], expected_code=1,
              expected_msg='not found in Kerberos database')

# Create a modified KDC environment and restart the KDC.
def restart_kdc(realm, kdc_conf):
    env = realm.special_env('extravars', True, kdc_conf=kdc_conf)
    realm.stop_kdc()
    realm.start_kdc(env=env)

# With no KDC configuration besides [domain_realm], we should get a
# referral for a NT-SRV-HST or NT-SRV-INST server name, but not an
# NT-UNKNOWN or NT-PRINCIPAL server name.
mark('[domain-realm] only')
testref(realm, 'srv-hst')
testref(realm, 'srv-inst')
testfail(realm, 'principal')
testfail(realm, 'unknown')

# With host_based_services matching the first server name component
# ("a"), we should get a referral for an NT-UNKNOWN server name.
# host_based_services can appear in either [kdcdefaults] or the realm
# section, with the realm values supplementing the kdcdefaults values.
# NT-SRV-HST server names should be unaffected by host_based_services,
# and NT-PRINCIPAL server names shouldn't get a referral regardless.
mark('host_based_services')
restart_kdc(realm, {'kdcdefaults': {'host_based_services': '*'}})
testref(realm, 'unknown')
testfail(realm, 'principal')
restart_kdc(realm, {'kdcdefaults': {'host_based_services': ['b', 'a,c']}})
testref(realm, 'unknown')
restart_kdc(realm, {'realms': {'$realm': {'host_based_services': 'a b c'}}})
testref(realm, 'unknown')
restart_kdc(realm, {'kdcdefaults': {'host_based_services': 'a'},
                    'realms': {'$realm': {'host_based_services': 'b c'}}})
testref(realm, 'unknown')
restart_kdc(realm, {'kdcdefaults': {'host_based_services': 'b,c'},
                    'realms': {'$realm': {'host_based_services': 'a,b'}}})
testref(realm, 'unknown')
restart_kdc(realm, {'kdcdefaults': {'host_based_services': 'b,c'}})
testfail(realm, 'unknown')
testref(realm, 'srv-hst')

# With no_host_referrals matching the first server name component, we
# should not get a referral even for NT-SRV-HOST server names
mark('no_host_referral')
restart_kdc(realm, {'kdcdefaults': {'no_host_referral': '*'}})
testfail(realm, 'srv-hst')
restart_kdc(realm, {'kdcdefaults': {'no_host_referral': ['b', 'a,c']}})
testfail(realm, 'srv-hst')
restart_kdc(realm, {'realms': {'$realm': {'no_host_referral': 'a b c'}}})
testfail(realm, 'srv-hst')
restart_kdc(realm, {'kdcdefaults': {'no_host_referral': 'a'},
                    'realms': {'$realm': {'no_host_referral': 'b c'}}})
testfail(realm, 'srv-hst')
restart_kdc(realm, {'kdcdefaults': {'no_host_referral': 'b,c'},
                    'realms': {'$realm': {'no_host_referral': 'a,b'}}})
testfail(realm, 'srv-hst')
restart_kdc(realm, {'kdcdefaults': {'no_host_referral': 'b,c'}})
testref(realm, 'srv-hst')

# no_host_referrals should override host_based_services for NT-UNKNWON
# server names.
restart_kdc(realm, {'kdcdefaults': {'no_host_referral': '*',
                                    'host_based_services': '*'}})
testfail(realm, 'unknown')

realm.stop()
refrealm.stop()

# Regression test for #7483: a KDC should not return a host referral
# to its own realm.
mark('#7483 regression test')
drealm = {'domain_realm': {'d': 'KRBTEST.COM'}}
realm = K5Realm(kdc_conf=drealm, create_host=False)
out, trace = realm.run(['./gcred', 'srv-hst', 'a/x.d@'], expected_code=1,
                       return_trace=True)
if 'back to same realm' in trace:
    fail('KDC returned referral to service realm')
realm.stop()

# Test client referrals.  Use the test KDB module for KRBTEST1.COM to
# simulate referrals since our built-in modules do not support them.
# No cross-realm TGTs are necessary.
mark('client referrals')
kdcconf = {'realms': {'$realm': {'database_module': 'test'}},
           'dbmodules': {'test': {'db_library': 'test',
                                  'alias': {'user': '@KRBTEST2.COM',
                                            'abc@XYZ': '@KRBTEST2.COM'}}}}
r1, r2 = cross_realms(2, xtgts=(),
                      args=({'kdc_conf': kdcconf, 'create_kdb': False}, None),
                      create_host=False)
r2.addprinc('abc\@XYZ', 'pw')
r1.start_kdc()
r1.kinit('user', expected_code=1,
         expected_msg='not found in Kerberos database')
r1.kinit('user', password('user'), ['-C'])
r1.klist('user@KRBTEST2.COM', 'krbtgt/KRBTEST2.COM')
r1.kinit('abc@XYZ', 'pw', ['-E'])
r1.klist('abc\@XYZ@KRBTEST2.COM', 'krbtgt/KRBTEST2.COM')

# Test that disable_encrypted_timestamp persists across client
# referrals.  (This test relies on SPAKE not being enabled by default
# on the KDC.)
r2.run([kadminl, 'modprinc', '+preauth', 'user'])
msgs = ('Encrypted timestamp (for ')
r1.kinit('user', password('user'), ['-C'], expected_trace=msgs)
dconf = {'realms': {'$realm': {'disable_encrypted_timestamp': 'true'}}}
denv = r1.special_env('disable_encts', False, krb5_conf=dconf)
msgs = ('Ignoring encrypted timestamp because it is disabled',
        '/Encrypted timestamp is disabled')
r1.kinit('user', None, ['-C'], env=denv, expected_code=1, expected_trace=msgs,
         expected_msg='Encrypted timestamp is disabled')

success('KDC host referral tests')