path: root/src/tests/t_kdb.py

#!/usr/bin/python
from k5test import *
import time

# Run kdbtest against the BDB module.
realm = K5Realm(create_kdb=False)
realm.run(['./kdbtest'])

# Set up an OpenLDAP test server if we can.

if (not os.path.exists(os.path.join(plugins, 'kdb', 'kldap.so')) and
    not os.path.exists(os.path.join(buildtop, 'lib', 'libkdb_ldap.a'))):
    success('Warning: not testing LDAP back end because it is not built')
    exit(0)

system_slapd = which('slapd')
if not system_slapd:
    success('Warning: not testing LDAP module because slapd not found')
    exit(0)

ldapdir = os.path.abspath('ldap')
slapd = os.path.join(ldapdir, 'slapd')
dbdir = os.path.join(ldapdir, 'ldap')
slapd_conf = os.path.join(ldapdir, 'slapd.conf')
slapd_out = os.path.join(ldapdir, 'slapd.out')
slapd_pidfile = os.path.join(ldapdir, 'pid')
ldap_pwfile = os.path.join(ldapdir, 'pw')
ldap_sock = os.path.join(ldapdir, 'sock')
ldap_uri = 'ldapi://%s/' % ldap_sock.replace(os.path.sep, '%2F')
schema = os.path.join(srctop, 'plugins', 'kdb', 'ldap', 'libkdb_ldap',
                      'kerberos.schema')
top_dn = 'cn=krb5'
admin_dn = 'cn=admin,cn=krb5'
admin_pw = 'admin'

shutil.rmtree(ldapdir, True)
os.mkdir(ldapdir)
os.mkdir(dbdir)

# Some Linux installations have AppArmor or similar restrictions on
# the slapd binary, which would prevent it from accessing the build
# directory.  Try to defeat this by copying the binary.
shutil.copy(system_slapd, slapd)

# Find the core schema file if we can.
core_schema = None
if os.path.isfile('/etc/ldap/schema/core.schema'):
    core_schema = '/etc/ldap/schema/core.schema'

# Make a slapd config file.  This is deprecated in OpenLDAP 2.3 and
# later, but it's easier than using LDIF and slapadd.  Include some
# authz-regexp entries for SASL authentication tests.  Load the core
# schema if we found it, for use in the DIGEST-MD5 test.
file = open(slapd_conf, 'w')
file.write('pidfile %s\n' % slapd_pidfile)
file.write('include %s\n' % schema)
if core_schema:
    file.write('include %s\n' % core_schema)
file.write('moduleload back_bdb\n')
file.write('database bdb\n')
file.write('suffix %s\n' % top_dn)
file.write('rootdn %s\n' % admin_dn)
file.write('rootpw %s\n' % admin_pw)
file.write('directory %s\n' % dbdir)
file.write('authz-regexp .*uidNumber=%d,cn=peercred,cn=external,cn=auth %s\n' %
           (os.geteuid(), admin_dn))
file.write('authz-regexp uid=digestuser,cn=digest-md5,cn=auth %s\n' % admin_dn)
file.close()

slapd_pid = -1
def kill_slapd():
    global slapd_pid
    if slapd_pid != -1:
        os.kill(slapd_pid, signal.SIGTERM)
        slapd_pid = -1
atexit.register(kill_slapd)

out = open(slapd_out, 'w')
subprocess.call([slapd, '-h', ldap_uri, '-f', slapd_conf], stdout=out,
                stderr=out)
out.close()
pidf = open(slapd_pidfile, 'r')
slapd_pid = int(pidf.read())
pidf.close()
output('*** Started slapd (pid %d, output in %s)\n' % (slapd_pid, slapd_out))

# slapd detaches before it finishes setting up its listener sockets
# (they are bound but listen() has not been called).  Give it a second
# to finish.
time.sleep(1)

# Run kdbtest against the LDAP module.
conf = {'realms': {'$realm': {'database_module': 'ldap'}},
        'dbmodules': {'ldap': {'db_library': 'kldap',
                               'ldap_kerberos_container_dn': top_dn,
                               'ldap_kdc_dn': admin_dn,
                               'ldap_kadmind_dn': admin_dn,
                               'ldap_service_password_file': ldap_pwfile,
                               'ldap_servers': ldap_uri}}}
realm = K5Realm(create_kdb=False, kdc_conf=conf)
input = admin_pw + '\n' + admin_pw + '\n'
realm.run([kdb5_ldap_util, 'stashsrvpw', admin_dn], input=input)
realm.run(['./kdbtest'])

# Run a kdb5_ldap_util command using the test server's admin DN and password.
def kldaputil(args, **kw):
    return realm.run([kdb5_ldap_util, '-D', admin_dn, '-w', admin_pw] + args,
                     **kw)

# kdbtest can't currently clean up after itself since the LDAP module
# doesn't support krb5_db_destroy.  So clean up after it with
# kdb5_ldap_util before proceeding.
kldaputil(['destroy', '-f'])

ldapmodify = which('ldapmodify')
if not ldapmodify:
    success('Warning: skipping some LDAP tests because ldapmodify not found')
    exit(0)

def ldap_modify(ldif, args=[]):
    proc = subprocess.Popen([ldapmodify, '-H', ldap_uri, '-D', admin_dn,
                             '-x', '-w', admin_pw] + args,
                            stdin=subprocess.PIPE, stdout=subprocess.PIPE,
                            stderr=subprocess.STDOUT)
    (out, dummy) = proc.communicate(ldif)
    output(out)

def ldap_add(dn, objectclass, attrs=[]):
    in_data = 'dn: %s\nobjectclass: %s\n' % (dn, objectclass)
    in_data += '\n'.join(attrs) + '\n'
    ldap_modify(in_data, ['-a'])

# Create krbContainer objects for use as subtrees.
ldap_add('cn=t1,cn=krb5', 'krbContainer')
ldap_add('cn=t2,cn=krb5', 'krbContainer')
ldap_add('cn=x,cn=t1,cn=krb5', 'krbContainer')
ldap_add('cn=y,cn=t2,cn=krb5', 'krbContainer')

# Create a realm, exercising all of the realm options.
kldaputil(['create', '-s', '-P', 'master', '-subtrees', 'cn=t2,cn=krb5',
           '-containerref', 'cn=t2,cn=krb5', '-sscope', 'one',
           '-maxtktlife', '5min', '-maxrenewlife', '10min', '-allow_svr'])

# Modify the realm, exercising overlapping subtree pruning.
kldaputil(['modify', '-subtrees',
           'cn=x,cn=t1,cn=krb5:cn=t1,cn=krb5:cn=t2,cn=krb5:cn=y,cn=t2,cn=krb5',
           '-containerref', 'cn=t1,cn=krb5', '-sscope', 'sub',
           '-maxtktlife', '5hour', '-maxrenewlife', '10hour', '+allow_svr'])

out = kldaputil(['list'])
if out != 'KRBTEST.COM\n':
    fail('Unexpected kdb5_ldap_util list output')

# Create a principal at a specified DN.  This is a little dodgy
# because we're sticking a krbPrincipalAux objectclass onto a subtree
# krbContainer, but it works and it avoids having to load core.schema
# in the test LDAP server.
out = realm.run_kadminl('ank -randkey -x dn=cn=krb5 princ1')
if 'DN is out of the realm subtree' not in out:
    fail('Unexpected kadmin.local output for out-of-realm dn')
out = realm.run_kadminl('ank -randkey -x dn=cn=t2,cn=krb5 princ1')
if 'Principal "princ1@KRBTEST.COM" created.\n' not in  out:
    fail('Unexpected kadmin.local output for specified dn')
out = realm.run_kadminl('getprinc princ1')
if 'Principal: princ1' not in out:
    fail('Unexpected kadmin.local output after creating princ1')
out = realm.run_kadminl('ank -randkey -x dn=cn=t2,cn=krb5 again')
if 'ldap object is already kerberized' not in out:
    fail('Unexpected kadmin.local output trying to re-kerberize DN')
# Check that we can't set linkdn on a non-standalone object.
out = realm.run_kadminl('modprinc -x linkdn=cn=t1,cn=krb5 princ1')
if 'link information can not be set' not in out:
    fail('Unexpected kadmin.local output trying to set linkdn on princ1')

# Create a principal with a specified linkdn.
out = realm.run_kadminl('ank -randkey -x linkdn=cn=krb5 princ2')
if 'DN is out of the realm subtree' not in out:
    fail('Unexpected kadmin.local output for out-of-realm linkdn')
out = realm.run_kadminl('ank -randkey -x linkdn=cn=t1,cn=krb5 princ2')
if 'Principal "princ2@KRBTEST.COM" created.\n' not in out:
    fail('Unexpected kadmin.local output for specified linkdn')
# Check that we can't reset linkdn.
out = realm.run_kadminl('modprinc -x linkdn=cn=t2,cn=krb5 princ2')
if 'kerberos principal is already linked' not in out:
    fail('Unexpected kadmin.local output for re-specified linkdn')

# Create a principal with a specified containerdn.
out = realm.run_kadminl('ank -randkey -x containerdn=cn=krb5 princ3')
if 'DN is out of the realm subtree' not in out:
    fail('Unexpected kadmin.local output for out-of-realm containerdn')
out = realm.run_kadminl('ank -randkey -x containerdn=cn=t1,cn=krb5 princ3')
if 'Principal "princ3@KRBTEST.COM" created.\n' not in out:
    fail('Unexpected kadmin.local output for specified containerdn')
out = realm.run_kadminl('modprinc -x containerdn=cn=t2,cn=krb5 princ3')
if 'containerdn option not supported' not in out:
    fail('Unexpected kadmin.local output trying to reset containerdn')

# Create and modify a ticket policy.
kldaputil(['create_policy', '-maxtktlife', '3hour', '-maxrenewlife', '6hour',
           '-allow_forwardable', 'tktpol'])
kldaputil(['modify_policy', '-maxtktlife', '4hour', '-maxrenewlife', '8hour',
           '+requires_preauth', 'tktpol'])
out = kldaputil(['view_policy', 'tktpol'])
if ('Ticket policy: tktpol\n' not in out or
    'Maximum ticket life: 0 days 04:00:00\n' not in out or
    'Maximum renewable life: 0 days 08:00:00\n' not in out or
    'Ticket flags: DISALLOW_FORWARDABLE REQUIRES_PRE_AUTH' not in out):
    fail('Unexpected kdb5_ldap_util view_policy output')

out = kldaputil(['list_policy'])
if out != 'tktpol\n':
    fail('Unexpected kdb5_ldap_util list_policy output')

# Associate the ticket policy to a principal.
realm.run_kadminl('ank -randkey -x tktpolicy=tktpol princ4')
out = realm.run_kadminl('getprinc princ4')
if ('Maximum ticket life: 0 days 04:00:00\n' not in out or
    'Maximum renewable life: 0 days 08:00:00\n' not in out or
    'Attributes: DISALLOW_FORWARDABLE REQUIRES_PRE_AUTH\n' not in out):
    fail('Unexpected getprinc output with ticket policy')

# Destroying the policy should fail while a principal references it.
kldaputil(['destroy_policy', '-force', 'tktpol'], expected_code=1)

# Dissociate the ticket policy from the principal.
realm.run_kadminl('modprinc -x tktpolicy= princ4')
out = realm.run_kadminl('getprinc princ4')
if ('Maximum ticket life: 0 days 05:00:00\n' not in out or
    'Maximum renewable life: 0 days 10:00:00\n' not in out or
    'Attributes:\n' not in out):
    fail('Unexpected getprinc output without ticket policy')

# Destroy the ticket policy.
kldaputil(['destroy_policy', '-force', 'tktpol'])
kldaputil(['view_policy', 'tktpol'], expected_code=1)
out = kldaputil(['list_policy'])
if out:
    fail('Unexpected kdb5_ldap_util list_policy output after destroy')

# Create another ticket policy to be destroyed with the realm.
kldaputil(['create_policy', 'tktpol2'])

# Try to create a password policy conflicting with a ticket policy.
out = realm.run_kadminl('addpol tktpol2')
if 'Already exists while creating policy "tktpol2"' not in out:
    fail('Expected error not seen in kadmin.local output')

# Try to create a ticket policy conflicting with a password policy.
realm.run_kadminl('addpol pwpol')
out = kldaputil(['create_policy', 'pwpol'], expected_code=1)
if 'Already exists while creating policy object' not in out:
    fail('Expected error not seen in kdb5_ldap_util output')

# Try to use a password policy as a ticket policy.
out = realm.run_kadminl('modprinc -x tktpolicy=pwpol princ4')
if 'Object class violation' not in out:
    fail('Expected error not seem in kadmin.local output')

# Try to use a ticket policy as a password policy (CVE-2014-5353).
out = realm.run_kadminl('modprinc -policy tktpol2 princ4')
if 'WARNING: policy "tktpol2" does not exist' not in out:
    fail('Expected error not seen in kadmin.local output')

# Do some basic tests with a KDC against the LDAP module, exercising the
# db_args processing code.
realm.start_kdc(['-x', 'nconns=3', '-x', 'host=' + ldap_uri,
                 '-x', 'binddn=' + admin_dn, '-x', 'bindpwd=' + admin_pw])
realm.addprinc(realm.user_princ, password('user'))
realm.addprinc(realm.host_princ)
realm.extract_keytab(realm.host_princ, realm.keytab)
realm.kinit(realm.user_princ, password('user'))
realm.run([kvno, realm.host_princ])
realm.klist(realm.user_princ, realm.host_princ)

# Test service principal aliases.
realm.addprinc('canon')
ldap_modify('dn: krbPrincipalName=canon@KRBTEST.COM,cn=t1,cn=krb5\n'
            'changetype: modify\n'
            'add: krbPrincipalName\n'
            'krbPrincipalName: alias@KRBTEST.COM\n'
            '-\n'
            'add: krbCanonicalName\n'
            'krbCanonicalName: canon@KRBTEST.COM\n')
out = realm.run_kadminl('getprinc alias')
if 'Principal: canon@KRBTEST.COM\n' not in out:
    fail('Could not fetch canon through alias')
out = realm.run_kadminl('getprinc canon')
if 'Principal: canon@KRBTEST.COM\n' not in out:
    fail('Could not fetch canon through canon')
realm.run([kvno, 'alias'])
realm.run([kvno, 'canon'])
out = realm.run([klist])
if 'alias@KRBTEST.COM\n' not in out or 'canon@KRBTEST.COM' not in out:
    fail('After fetching alias and canon, klist is missing one or both')

# Make sure an alias to the local TGS is still treated like an alias.
ldap_modify('dn: krbPrincipalName=krbtgt/KRBTEST.COM@KRBTEST.COM,'
            'cn=KRBTEST.COM,cn=krb5\n'
            'changetype: modify\n'
            'add:krbPrincipalName\n'
            'krbPrincipalName: tgtalias@KRBTEST.COM\n'
            '-\n'
            'add: krbCanonicalName\n'
            'krbCanonicalName: krbtgt/KRBTEST.COM@KRBTEST.COM\n')
out = realm.run_kadminl('getprinc tgtalias')
if 'Principal: krbtgt/KRBTEST.COM@KRBTEST.COM' not in out:
    fail('Could not fetch krbtgt through tgtalias')
realm.run([kvno, 'tgtalias'])
out = realm.run([klist])
if 'tgtalias@KRBTEST.COM\n' not in out:
    fail('After fetching tgtalias, klist is missing it')

# Make sure aliases work in header tickets.
realm.run_kadminl('modprinc -maxrenewlife "3 hours" user')
realm.run_kadminl('modprinc -maxrenewlife "3 hours" krbtgt/KRBTEST.COM')
realm.kinit(realm.user_princ, password('user'), ['-l', '1h', '-r', '2h'])
realm.run([kvno, 'alias'])
realm.kinit(realm.user_princ, flags=['-R', '-S', 'alias'])
realm.klist(realm.user_princ, 'alias@KRBTEST.COM')

# Regression test for #7980 (fencepost when dividing keys up by kvno).
realm.run_kadminl('addprinc -randkey -e aes256-cts,aes128-cts kvnoprinc')
realm.run_kadminl('cpw -randkey -keepold -e aes256-cts,aes128-cts kvnoprinc')
out = realm.run_kadminl('getprinc kvnoprinc')
if 'Number of keys: 4' not in out:
    fail('After cpw -keepold, wrong number of keys')
realm.run_kadminl('cpw -randkey -keepold -e aes256-cts,aes128-cts kvnoprinc')
out = realm.run_kadminl('getprinc kvnoprinc')
if 'Number of keys: 6' not in out:
    fail('After cpw -keepold, wrong number of keys')

# Regression test for #8041 (NULL dereference on keyless principals).
out = realm.run_kadminl('addprinc -nokey keylessprinc')
if 'Principal "keylessprinc@KRBTEST.COM" created' not in out:
    fail('Failed to create keyless principal')
out = realm.run_kadminl('getprinc keylessprinc')
if 'Number of keys: 0' not in out:
    fail('Failed to create a principal with no keys')
realm.run_kadminl('cpw -randkey -e aes256-cts,aes128-cts keylessprinc')
realm.run_kadminl('cpw -randkey -keepold -e aes256-cts,aes128-cts keylessprinc')
out = realm.run_kadminl('getprinc keylessprinc')
if 'Number of keys: 4' not in out:
    fail('Failed to add keys to keylessprinc')
realm.run_kadminl('purgekeys -all keylessprinc')
out = realm.run_kadminl('getprinc keylessprinc')
if 'Number of keys: 0' not in out:
    fail('After purgekeys -all, keys remain')

realm.stop()

# Briefly test dump and load.
dumpfile = os.path.join(realm.testdir, 'dump')
realm.run([kdb5_util, 'dump', dumpfile])
out = realm.run([kdb5_util, 'load', dumpfile], expected_code=1)
if 'KDB module requires -update argument' not in out:
    fail('Unexpected error from kdb5_util load without -update')
realm.run([kdb5_util, 'load', '-update', dumpfile])

# Destroy the realm.
kldaputil(['destroy', '-f'])
out = kldaputil(['list'])
if out:
    fail('Unexpected kdb5_ldap_util list output after destroy')

if not core_schema:
    success('Warning: skipping some LDAP tests because core schema not found')
    sys.exit(0)

if runenv.have_sasl != 'yes':
    success('Warning: skipping some LDAP tests because SASL support not built')
    sys.exit(0)

# Test SASL EXTERNAL auth.  Remove the DNs and service password file
# from the DB module config.
os.remove(ldap_pwfile)
dbmod = conf['dbmodules']['ldap']
dbmod['ldap_kdc_sasl_mech'] = dbmod['ldap_kadmind_sasl_mech'] = 'EXTERNAL'
del dbmod['ldap_service_password_file']
del dbmod['ldap_kdc_dn'], dbmod['ldap_kadmind_dn']
realm = K5Realm(create_kdb=False, kdc_conf=conf)
realm.run([kdb5_ldap_util, 'create', '-s', '-P', 'master'])
realm.start_kdc()
realm.addprinc(realm.user_princ, password('user'))
realm.kinit(realm.user_princ, password('user'))
realm.stop()
realm.run([kdb5_ldap_util, 'destroy', '-f'])

# Test SASL DIGEST-MD5 auth.  We need to set a clear-text password for
# the admin DN, so create a person entry (requires the core schema).
# Restore the service password file in the config and set authcids.
ldap_add('cn=admin,cn=krb5', 'person',
         ['sn: dummy', 'userPassword: admin'])
dbmod['ldap_kdc_sasl_mech'] = dbmod['ldap_kadmind_sasl_mech'] = 'DIGEST-MD5'
dbmod['ldap_kdc_sasl_authcid'] = 'digestuser'
dbmod['ldap_kadmind_sasl_authcid'] = 'digestuser'
dbmod['ldap_service_password_file'] = ldap_pwfile
realm = K5Realm(create_kdb=False, kdc_conf=conf)
input = admin_pw + '\n' + admin_pw + '\n'
realm.run([kdb5_ldap_util, 'stashsrvpw', 'digestuser'], input=input)
realm.run([kdb5_ldap_util, 'create', '-s', '-P', 'master'])
realm.start_kdc()
realm.addprinc(realm.user_princ, password('user'))
realm.kinit(realm.user_princ, password('user'))
realm.stop()
# Exercise DB options, which should cause binding to fail.
out = realm.run([kadmin_local, '-x', 'sasl_authcid=ab', '-q', 'getprinc user'],
                expected_code=1)
if 'Cannot bind to LDAP server' not in out:
    fail('Expected error not seen in kadmin.local output')
out = realm.run([kadmin_local, '-x', 'bindpwd=wrong', '-q', 'getprinc user'],
                expected_code=1)
if 'Cannot bind to LDAP server' not in out:
    fail('Expected error not seen in kadmin.local output')
realm.run([kdb5_ldap_util, 'destroy', '-f'])

# We could still use tests to exercise:
# * DB arg handling in krb5_ldap_create
# * krbAllowedToDelegateTo attribute processing
# * A load operation overwriting a standalone principal entry which
#   already exists but doesn't have a krbPrincipalName attribute
#   matching the principal name.
# * A bunch of invalid-input error conditions
#
# There is no coverage for the following because it would be difficult:
# * Out-of-memory error conditions
# * Handling of failures from slapd (including krb5_retry_get_ldap_handle)
# * Handling of servers which don't support mod-increment
# * krb5_ldap_delete_krbcontainer (only happens if krb5_ldap_create fails)

success('LDAP and DB2 KDB tests')