1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
# pam.py - functions authentication, authorisation and session handling
#
# Copyright (C) 2010, 2011, 2012 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
import logging
import ldap
import cfg
import common
import constants
import passwd
def try_bind(userdn, password):
# open a new connection
conn = ldap.initialize(cfg.uri)
# bind using the specified credentials
conn.simple_bind_s(userdn, password)
# perform search for own object (just to do any kind of search)
res = conn.search_s(userdn, ldap.SCOPE_BASE, '(objectClass=*)', ['dn', ])
for entry in res:
if entry[0] == userdn:
return
raise ldap.NO_SUCH_OBJECT()
class PAMRequest(common.Request):
def validate_request(self, parameters):
"""This method checks the provided username for validity and fills
in the DN if needed."""
# check username for validity
common.validate_name(parameters['username'])
# look up user DN if not known
if not parameters['userdn']:
entry = passwd.uid2entry(self.conn, parameters['username'])
if not entry:
raise ValueError('%r: user not found' % parameters['username'])
# save the DN
parameters['userdn'] = entry[0]
# get the "real" username
value = passwd.attmap.get_rdn_value(entry[0], 'uid')
if not value:
# get the username from the uid attribute
values = entry[1]['uid']
if not values or not values[0]:
logging.warning('%s: is missing a %s attribute', dn, passwd.attmap['uid'])
value = values[0]
# check the username
if value and not common.isvalidname(value):
raise ValueError('%s: has invalid %s attribute', dn, passwd.attmap['uid'])
# check if the username is different and update it if needed
if value != parameters['username']:
logging.info('username changed from %r to %r', parameters['username'], value)
parameters['username'] = value
class PAMAuthenticationRequest(PAMRequest):
action = constants.NSLCD_ACTION_PAM_AUTHC
def read_parameters(self, fp):
return dict(username=fp.read_string(),
userdn=fp.read_string(),
servicename=fp.read_string(),
password=fp.read_string())
#self.validate_request()
# TODO: log call with parameters
def write(self, parameters, code=constants.NSLCD_PAM_SUCCESS, msg=''):
self.fp.write_int32(constants.NSLCD_RESULT_BEGIN)
self.fp.write_string(parameters['username'])
self.fp.write_string(parameters['userdn'])
self.fp.write_int32(code) # authc
self.fp.write_int32(constants.NSLCD_PAM_SUCCESS) # authz
self.fp.write_string(msg) # authzmsg
self.fp.write_int32(constants.NSLCD_RESULT_END)
def handle_request(self, parameters):
# if the username is blank and rootpwmoddn is configured, try to
# authenticate as administrator, otherwise validate request as usual
if not parameters['username'] and cfg.rootpwmoddn:
# authenticate as rootpwmoddn
userdn = cfg.rootpwmoddn
# if the caller is root we will allow the use of rootpwmodpw
if not parameters['password'] and self.calleruid == 0 and cfg.rootpwmodpw:
password = cfg.rootpwmodpw
elif parameters['password']:
password = parameters['password']
else:
raise ValueError('password missing')
else:
self.validate_request(parameters)
userdn = parameters['userdn']
password = parameters['password']
# try authentication
try:
try_bind(userdn, password)
logging.debug('bind successful')
self.write(parameters)
except ldap.INVALID_CREDENTIALS, e:
try:
msg = e[0]['desc']
except:
msg = str(e)
logging.debug('bind failed: %s', msg)
self.write(parameters, constants.NSLCD_PAM_AUTH_ERR, msg)
#class PAMAuthorisationRequest(PAMRequest):
# action = constants.NSLCD_ACTION_PAM_AUTHZ
# def handle_request(self):
#NSLCD_ACTION_PAM_SESS_O
#NSLCD_ACTION_PAM_SESS_C
#NSLCD_ACTION_PAM_PWMOD
|