/usr/lib/python2.7/dist-packages/kdcproxy/config/mit.py is in python-kdcproxy 0.3.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# All rights reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import ctypes
import sys
try:
import urllib.parse as urlparse
except ImportError: # pragma: no cover
import urlparse
from kdcproxy.config import IConfig
class KRB5Error(Exception):
pass
PY3 = sys.version_info[0] == 3
try:
LIBKRB5 = ctypes.CDLL('libkrb5.so.3')
except OSError as e: # pragma: no cover
LIBKRB5 = e
else:
class c_text_p(ctypes.c_char_p): # noqa
"""A c_char_p variant that can handle UTF-8 text"""
@classmethod
def from_param(cls, value):
if value is None:
return None
if PY3 and isinstance(value, str):
return value.encode('utf-8')
elif not PY3 and isinstance(value, unicode): # noqa
return value.encode('utf-8')
elif not isinstance(value, bytes):
raise TypeError(value)
else:
return value
@property
def text(self):
value = self.value
if value is None:
return None
elif not isinstance(value, str):
return value.decode('utf-8')
return value
class _krb5_context(ctypes.Structure): # noqa
"""krb5/krb5.h struct _krb5_context"""
__slots__ = ()
_fields_ = []
class _profile_t(ctypes.Structure): # noqa
"""profile.h struct _profile_t"""
__slots__ = ()
_fields_ = []
def krb5_errcheck(result, func, arguments):
"""Error checker for krb5_error return value"""
if result != 0:
raise KRB5Error(result, func.__name__, arguments)
krb5_context = ctypes.POINTER(_krb5_context)
profile_t = ctypes.POINTER(_profile_t)
iter_p = ctypes.c_void_p
krb5_error = ctypes.c_int32
krb5_init_context = LIBKRB5.krb5_init_context
krb5_init_context.argtypes = (ctypes.POINTER(krb5_context), )
krb5_init_context.restype = krb5_error
krb5_init_context.errcheck = krb5_errcheck
krb5_free_context = LIBKRB5.krb5_free_context
krb5_free_context.argtypes = (krb5_context, )
krb5_free_context.retval = None
krb5_get_profile = LIBKRB5.krb5_get_profile
krb5_get_profile.argtypes = (krb5_context, ctypes.POINTER(profile_t))
krb5_get_profile.restype = krb5_error
krb5_get_profile.errcheck = krb5_errcheck
profile_release = LIBKRB5.profile_release
profile_release.argtypes = (profile_t, )
profile_release.restype = None
profile_iterator_create = LIBKRB5.profile_iterator_create
profile_iterator_create.argtypes = (profile_t,
ctypes.POINTER(c_text_p),
ctypes.c_int,
ctypes.POINTER(iter_p))
profile_iterator_create.restype = krb5_error
profile_iterator_create.errcheck = krb5_errcheck
profile_iterator_free = LIBKRB5.profile_iterator_free
profile_iterator_free.argtypes = (ctypes.POINTER(iter_p), )
profile_iterator_free.retval = None
profile_iterator = LIBKRB5.profile_iterator
profile_iterator.argtypes = (ctypes.POINTER(iter_p),
ctypes.POINTER(c_text_p),
ctypes.POINTER(c_text_p))
profile_iterator.restype = krb5_error
profile_iterator.errcheck = krb5_errcheck
profile_get_boolean = LIBKRB5.profile_get_boolean
profile_get_boolean.argtypes = (profile_t,
c_text_p,
c_text_p,
c_text_p,
ctypes.c_int,
ctypes.POINTER(ctypes.c_int))
profile_get_boolean.restype = krb5_error
profile_get_boolean.errcheck = krb5_errcheck
class KRB5Profile:
class Iterator:
def __init__(self, profile, *args):
# Convert string arguments to UTF8 bytes
args = [c_text_p.from_param(arg) for arg in args]
args.append(None)
# Create array
array = c_text_p * len(args)
self.__path = array(*args)
# Call the function
self.__iterator = iter_p()
profile_iterator_create(profile,
self.__path,
1,
ctypes.byref(self.__iterator))
def __iter__(self):
return self
def __next__(self):
try:
name = c_text_p()
value = c_text_p()
profile_iterator(ctypes.byref(self.__iterator),
ctypes.byref(name),
ctypes.byref(value))
if not name.value:
raise KRB5Error
return name.text, value.text
except KRB5Error:
profile_iterator_free(ctypes.byref(self.__iterator))
self.__iterator = None
raise StopIteration()
def __del__(self):
if self.__iterator: # pragma: no cover
profile_iterator_free(ctypes.byref(self.__iterator))
self.__iterator = None
# Handle iterator API change
if not PY3:
next = __next__
def __init__(self):
self.__context = self.__profile = None
if isinstance(LIBKRB5, Exception): # pragma: no cover
raise LIBKRB5
context = krb5_context()
krb5_init_context(ctypes.byref(context))
self.__context = context
profile = profile_t()
krb5_get_profile(context, ctypes.byref(profile))
self.__profile = profile
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
if self.__context:
krb5_free_context(self.__context)
self.__context = None
if self.__profile:
profile_release(self.__profile)
self.__profile = None
def __del__(self):
self.__exit__(None, None, None)
def __getitem__(self, name):
return self.section(name)
def get_bool(self, name, subname=None, subsubname=None, default=False):
val = ctypes.c_int(1)
profile_get_boolean(self.__profile,
name, subname, subsubname,
int(default), ctypes.byref(val))
return bool(val.value)
def section(self, *args):
output = []
for k, v in KRB5Profile.Iterator(self.__profile, *args):
if v is None:
tmp = args + (k,)
output.append((k, self.section(*tmp)))
else:
output.append((k, v))
return output
class MITConfig(IConfig):
CONFIG_KEYS = ('kdc', 'admin_server', 'kpasswd_server')
def __init__(self, *args, **kwargs):
self.__config = {}
with KRB5Profile() as prof:
# Load DNS setting
self.__config["dns"] = prof.get_bool("libdefaults",
"dns_fallback",
default=True)
if "dns_lookup_kdc" in dict(prof.section("libdefaults")):
self.__config["dns"] = prof.get_bool("libdefaults",
"dns_lookup_kdc",
default=True)
# Load all configured realms
self.__config["realms"] = {}
for realm, values in prof.section("realms"):
rconf = self.__config["realms"].setdefault(realm, {})
for server, hostport in values:
if server not in self.CONFIG_KEYS:
continue
parsed = urlparse.urlparse(hostport)
if parsed.hostname is None:
scheme = {'kdc': 'kerberos'}.get(server, 'kpasswd')
parsed = urlparse.urlparse(scheme + "://" + hostport)
if parsed.port is not None and server == 'admin_server':
hostport = hostport.split(':', 1)[0]
parsed = urlparse.urlparse("kpasswd://" + hostport)
rconf.setdefault(server, []).append(parsed.geturl())
def lookup(self, realm, kpasswd=False):
rconf = self.__config.get("realms", {}).get(realm, {})
if kpasswd:
servers = list(rconf.get('kpasswd_server', []))
servers.extend(rconf.get('admin_server', []))
else:
servers = rconf.get('kdc', [])
return tuple(servers)
def use_dns(self, default=True):
return self.__config["dns"]
if __name__ == "__main__":
from pprint import pprint
with KRB5Profile() as prof:
conf = prof.section()
assert conf
pprint(conf)
conf = MITConfig()
for realm in sys.argv[1:]:
kdc = conf.lookup(realm)
assert kdc
print("\n%s (kdc): " % realm)
pprint(kdc)
kpasswd = conf.lookup(realm, True)
assert kpasswd
print("\n%s (kpasswd): " % realm)
pprint(kpasswd)
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