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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
# Authors: Simo Sorce <ssorce@redhat.com>
#
# Copyright (C) 2007 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2 only
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import socket
import logging
import ipapython.dnsclient
import ldap
from ldap import LDAPError
class IPADiscovery:
def __init__(self):
self.realm = None
self.domain = None
self.server = None
self.basedn = None
def getServerName(self):
return self.server
def getDomainName(self):
return self.domain
def getRealmName(self):
return self.realm
def getBaseDN(self):
return self.basedn
def search(self, domain = "", server = ""):
hostname = ""
qname = ""
results = []
result = []
krbret = []
ldapret = []
if not server:
if not domain: #domain not provided do full DNS discovery
# get the local host name
hostname = socket.getfqdn()
if not hostname:
return -10 #bad host configuration
# first, check for an LDAP server for the local domain
p = hostname.find(".")
if p == -1: #no domain name
return -1
domain = hostname[p+1:]
while not self.server:
logging.debug("[ipadnssearchldap("+domain+")]")
self.server = self.ipadnssearchldap(domain)
if self.server:
self.domain = domain
else:
p = domain.find(".")
if p == -1: #no ldap server found and last component of the domain already tested
return -1
domain = domain[p+1:]
else:
logging.debug("[ipadnssearchldap]")
self.server = self.ipadnssearchldap(domain)
if self.server:
self.domain = domain
else:
return -2 #no ldap server found
#search for kerberos TODO: move this after ipacheckldap()
logging.debug("[ipadnssearchkrb]")
krbret = self.ipadnssearchkrb(self.domain)
if not krbret:
return -3 #no krb server found
self.realm = krbret[0]
else: #server forced on us, this means DNS doesn't work :/
self.domain = domain
self.server = server
logging.debug("[ipacheckldap]")
# check ldap now
ldapret = self.ipacheckldap(self.server, self.realm)
if not ldapret:
return -4 # not an IPA server (or broken config)
self.server = ldapret[0]
self.realm = ldapret[1]
return 0
def ipacheckldap(self, thost, trealm):
lret = []
lres = []
lattr = ""
linfo = ""
lrealms = []
i = 0
#now verify the server is really an IPA server
try:
logging.debug("Init ldap with: ldap://"+thost+":389")
lh = ldap.initialize("ldap://"+thost+":389")
lh.simple_bind_s("","")
logging.debug("Search rootdse")
lret = lh.search_s("", ldap.SCOPE_BASE, "(objectClass=*)")
for lattr in lret[0][1]:
if lattr.lower() == "namingcontexts":
self.basedn = lret[0][1][lattr][0]
logging.debug("Search for (info=*) in "+self.basedn+"(base)")
lret = lh.search_s(self.basedn, ldap.SCOPE_BASE, "(info=IPA*)")
if not lret:
return []
logging.debug("Found: "+str(lret))
for lattr in lret[0][1]:
if lattr.lower() == "info":
linfo = lret[0][1][lattr][0].lower()
break
if not linfo:
return []
#search and return known realms
logging.debug("Search for (objectClass=krbRealmContainer) in "+self.basedn+"(sub)")
lret = lh.search_s("cn=kerberos,"+self.basedn, ldap.SCOPE_SUBTREE, "(objectClass=krbRealmContainer)")
if not lret:
#something very wrong
return []
logging.debug("Found: "+str(lret))
for lres in lret:
for lattr in lres[1]:
if lattr.lower() == "cn":
lrealms.append(lres[1][lattr][0])
if trealm:
for r in lrealms:
if trealm == r:
return [thost, trealm]
# must match or something is very wrong
return []
else:
if len(lrealms) != 1:
#which one? we can't attach to a multi-realm server without DNS working
return []
else:
return [thost, lrealms[0]]
#we shouldn't get here
return []
except LDAPError, err:
if not isinstance(err, ldap.TIMEOUT):
logging.error("LDAP Error: %s: %s" %
(err.args[0]['desc'], err.args[0].get('info', '')))
else:
logging.error("LDAP Error: timeout")
return []
def ipadnssearchldap(self, tdomain):
servers = ""
rserver = ""
qname = "_ldap._tcp."+tdomain
# terminate the name
if not qname.endswith("."):
qname += "."
results = ipapython.dnsclient.query(qname, ipapython.dnsclient.DNS_C_IN, ipapython.dnsclient.DNS_T_SRV)
for result in results:
if result.dns_type == ipapython.dnsclient.DNS_T_SRV:
rserver = result.rdata.server.rstrip(".")
if result.rdata.port and result.rdata.port != 389:
rserver += ":" + str(result.rdata.port)
if servers:
servers += "," + rserver
else:
servers = rserver
break
return servers
def ipadnssearchkrb(self, tdomain):
realm = ""
kdc = ""
# now, check for a Kerberos realm the local host or domain is in
qname = "_kerberos." + tdomain
# terminate the name
if not qname.endswith("."):
qname += "."
results = ipapython.dnsclient.query(qname, ipapython.dnsclient.DNS_C_IN, ipapython.dnsclient.DNS_T_TXT)
for result in results:
if result.dns_type == ipapython.dnsclient.DNS_T_TXT:
realm = result.rdata.data
if realm:
break
if realm:
# now fetch server information for the realm
qname = "_kerberos._udp." + tdomain
# terminate the name
if not qname.endswith("."):
qname += "."
results = ipapython.dnsclient.query(qname, ipapython.dnsclient.DNS_C_IN, ipapython.dnsclient.DNS_T_SRV)
for result in results:
if result.dns_type == ipapython.dnsclient.DNS_T_SRV:
qname = result.rdata.server.rstrip(".")
if result.rdata.port and result.rdata.port != 88:
qname += ":" + str(result.rdata.port)
if kdc:
kdc += "," + qname
else:
kdc = qname
return [realm, kdc]
|
