/usr/lib/python2.7/dist-packages/pymongo/auth.py is in python-pymongo 2.7.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Authentication helpers."""
import hmac
try:
import hashlib
_MD5 = hashlib.md5
_DMOD = _MD5
except ImportError: # for Python < 2.5
import md5
_MD5 = md5.new
_DMOD = md5
HAVE_KERBEROS = True
try:
import kerberos
except ImportError:
HAVE_KERBEROS = False
from bson.binary import Binary
from bson.py3compat import b
from bson.son import SON
from pymongo.errors import ConfigurationError, OperationFailure
MECHANISMS = frozenset(['GSSAPI', 'MONGODB-CR', 'MONGODB-X509', 'PLAIN'])
"""The authentication mechanisms supported by PyMongo."""
def _build_credentials_tuple(mech, source, user, passwd, extra):
"""Build and return a mechanism specific credentials tuple.
"""
if mech == 'GSSAPI':
gsn = extra.get('gssapiservicename', 'mongodb')
# No password, source is always $external.
return (mech, '$external', user, gsn)
elif mech == 'MONGODB-X509':
return (mech, '$external', user)
return (mech, source, user, passwd)
def _password_digest(username, password):
"""Get a password digest to use for authentication.
"""
if not isinstance(password, basestring):
raise TypeError("password must be an instance "
"of %s" % (basestring.__name__,))
if len(password) == 0:
raise ValueError("password can't be empty")
if not isinstance(username, basestring):
raise TypeError("username must be an instance "
"of %s" % (basestring.__name__,))
md5hash = _MD5()
data = "%s:mongo:%s" % (username, password)
md5hash.update(data.encode('utf-8'))
return unicode(md5hash.hexdigest())
def _auth_key(nonce, username, password):
"""Get an auth key to use for authentication.
"""
digest = _password_digest(username, password)
md5hash = _MD5()
data = "%s%s%s" % (nonce, unicode(username), digest)
md5hash.update(data.encode('utf-8'))
return unicode(md5hash.hexdigest())
def _authenticate_gssapi(credentials, sock_info, cmd_func):
"""Authenticate using GSSAPI.
"""
try:
dummy, username, gsn = credentials
# Starting here and continuing through the while loop below - establish
# the security context. See RFC 4752, Section 3.1, first paragraph.
result, ctx = kerberos.authGSSClientInit(
gsn + '@' + sock_info.host, gssflags=kerberos.GSS_C_MUTUAL_FLAG)
if result != kerberos.AUTH_GSS_COMPLETE:
raise OperationFailure('Kerberos context failed to initialize.')
try:
# pykerberos uses a weird mix of exceptions and return values
# to indicate errors.
# 0 == continue, 1 == complete, -1 == error
# Only authGSSClientStep can return 0.
if kerberos.authGSSClientStep(ctx, '') != 0:
raise OperationFailure('Unknown kerberos '
'failure in step function.')
# Start a SASL conversation with mongod/s
# Note: pykerberos deals with base64 encoded byte strings.
# Since mongo accepts base64 strings as the payload we don't
# have to use bson.binary.Binary.
payload = kerberos.authGSSClientResponse(ctx)
cmd = SON([('saslStart', 1),
('mechanism', 'GSSAPI'),
('payload', payload),
('autoAuthorize', 1)])
response, _ = cmd_func(sock_info, '$external', cmd)
# Limit how many times we loop to catch protocol / library issues
for _ in xrange(10):
result = kerberos.authGSSClientStep(ctx,
str(response['payload']))
if result == -1:
raise OperationFailure('Unknown kerberos '
'failure in step function.')
payload = kerberos.authGSSClientResponse(ctx) or ''
cmd = SON([('saslContinue', 1),
('conversationId', response['conversationId']),
('payload', payload)])
response, _ = cmd_func(sock_info, '$external', cmd)
if result == kerberos.AUTH_GSS_COMPLETE:
break
else:
raise OperationFailure('Kerberos '
'authentication failed to complete.')
# Once the security context is established actually authenticate.
# See RFC 4752, Section 3.1, last two paragraphs.
if kerberos.authGSSClientUnwrap(ctx,
str(response['payload'])) != 1:
raise OperationFailure('Unknown kerberos '
'failure during GSS_Unwrap step.')
if kerberos.authGSSClientWrap(ctx,
kerberos.authGSSClientResponse(ctx),
username) != 1:
raise OperationFailure('Unknown kerberos '
'failure during GSS_Wrap step.')
payload = kerberos.authGSSClientResponse(ctx)
cmd = SON([('saslContinue', 1),
('conversationId', response['conversationId']),
('payload', payload)])
response, _ = cmd_func(sock_info, '$external', cmd)
finally:
kerberos.authGSSClientClean(ctx)
except kerberos.KrbError, exc:
raise OperationFailure(str(exc))
def _authenticate_plain(credentials, sock_info, cmd_func):
"""Authenticate using SASL PLAIN (RFC 4616)
"""
source, username, password = credentials
payload = ('\x00%s\x00%s' % (username, password)).encode('utf-8')
cmd = SON([('saslStart', 1),
('mechanism', 'PLAIN'),
('payload', Binary(payload)),
('autoAuthorize', 1)])
cmd_func(sock_info, source, cmd)
def _authenticate_cram_md5(credentials, sock_info, cmd_func):
"""Authenticate using CRAM-MD5 (RFC 2195)
"""
source, username, password = credentials
# The password used as the mac key is the
# same as what we use for MONGODB-CR
passwd = _password_digest(username, password)
cmd = SON([('saslStart', 1),
('mechanism', 'CRAM-MD5'),
('payload', Binary(b(''))),
('autoAuthorize', 1)])
response, _ = cmd_func(sock_info, source, cmd)
# MD5 as implicit default digest for digestmod is deprecated
# in python 3.4
mac = hmac.HMAC(key=passwd.encode('utf-8'), digestmod=_DMOD)
mac.update(response['payload'])
challenge = username.encode('utf-8') + b(' ') + b(mac.hexdigest())
cmd = SON([('saslContinue', 1),
('conversationId', response['conversationId']),
('payload', Binary(challenge))])
cmd_func(sock_info, source, cmd)
def _authenticate_x509(credentials, sock_info, cmd_func):
"""Authenticate using MONGODB-X509.
"""
dummy, username = credentials
query = SON([('authenticate', 1),
('mechanism', 'MONGODB-X509'),
('user', username)])
cmd_func(sock_info, '$external', query)
def _authenticate_mongo_cr(credentials, sock_info, cmd_func):
"""Authenticate using MONGODB-CR.
"""
source, username, password = credentials
# Get a nonce
response, _ = cmd_func(sock_info, source, {'getnonce': 1})
nonce = response['nonce']
key = _auth_key(nonce, username, password)
# Actually authenticate
query = SON([('authenticate', 1),
('user', username),
('nonce', nonce),
('key', key)])
cmd_func(sock_info, source, query)
_AUTH_MAP = {
'CRAM-MD5': _authenticate_cram_md5,
'GSSAPI': _authenticate_gssapi,
'MONGODB-CR': _authenticate_mongo_cr,
'MONGODB-X509': _authenticate_x509,
'PLAIN': _authenticate_plain,
}
def authenticate(credentials, sock_info, cmd_func):
"""Authenticate sock_info.
"""
mechanism = credentials[0]
if mechanism == 'GSSAPI':
if not HAVE_KERBEROS:
raise ConfigurationError('The "kerberos" module must be '
'installed to use GSSAPI authentication.')
auth_func = _AUTH_MAP.get(mechanism)
auth_func(credentials[1:], sock_info, cmd_func)
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