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
|
/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2010 InspIRCd Development Team
* See: http://wiki.inspircd.org/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*
* Taken from the UnrealIRCd 4.0 SVN version, based on
* InspIRCd 1.1.x.
*
* UnrealIRCd 4.0 (C) 2007 Carsten Valdemar Munk
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
* Heavily based on SQLauth
*/
#include "inspircd.h"
#include "users.h"
#include "channels.h"
#include "modules.h"
#include <ldap.h>
/* $ModDesc: Allow/Deny connections based upon answer from LDAP server */
/* $LinkerFlags: -lldap */
class ModuleLDAPAuth : public Module
{
LocalIntExt ldapAuthed;
std::string base;
std::string attribute;
std::string ldapserver;
std::string allowpattern;
std::string killreason;
std::string username;
std::string password;
int searchscope;
bool verbose;
bool useusername;
LDAP *conn;
public:
ModuleLDAPAuth() : ldapAuthed("ldapauth", this)
{
conn = NULL;
}
void init()
{
Implementation eventlist[] = { I_OnCheckReady, I_OnRehash, I_OnUserRegister };
ServerInstance->Modules->Attach(eventlist, this, 3);
OnRehash(NULL);
}
~ModuleLDAPAuth()
{
if (conn)
ldap_unbind_ext(conn, NULL, NULL);
}
void OnRehash(User* user)
{
ConfigReader Conf;
base = Conf.ReadValue("ldapauth", "baserdn", 0);
attribute = Conf.ReadValue("ldapauth", "attribute", 0);
ldapserver = Conf.ReadValue("ldapauth", "server", 0);
allowpattern = Conf.ReadValue("ldapauth", "allowpattern", 0);
killreason = Conf.ReadValue("ldapauth", "killreason", 0);
std::string scope = Conf.ReadValue("ldapauth", "searchscope", 0);
username = Conf.ReadValue("ldapauth", "binddn", 0);
password = Conf.ReadValue("ldapauth", "bindauth", 0);
verbose = Conf.ReadFlag("ldapauth", "verbose", 0); /* Set to true if failed connects should be reported to operators */
useusername = Conf.ReadFlag("ldapauth", "userfield", 0);
if (scope == "base")
searchscope = LDAP_SCOPE_BASE;
else if (scope == "onelevel")
searchscope = LDAP_SCOPE_ONELEVEL;
else searchscope = LDAP_SCOPE_SUBTREE;
Connect();
}
bool Connect()
{
if (conn != NULL)
ldap_unbind_ext(conn, NULL, NULL);
int res, v = LDAP_VERSION3;
res = ldap_initialize(&conn, ldapserver.c_str());
if (res != LDAP_SUCCESS)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "LDAP connection failed: %s", ldap_err2string(res));
conn = NULL;
return false;
}
res = ldap_set_option(conn, LDAP_OPT_PROTOCOL_VERSION, (void *)&v);
if (res != LDAP_SUCCESS)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "LDAP set protocol to v3 failed: %s", ldap_err2string(res));
ldap_unbind_ext(conn, NULL, NULL);
conn = NULL;
return false;
}
return true;
}
ModResult OnUserRegister(LocalUser* user)
{
if ((!allowpattern.empty()) && (InspIRCd::Match(user->nick,allowpattern)))
{
ldapAuthed.set(user,1);
return MOD_RES_PASSTHRU;
}
if (!CheckCredentials(user))
{
ServerInstance->Users->QuitUser(user, killreason);
return MOD_RES_DENY;
}
return MOD_RES_PASSTHRU;
}
bool CheckCredentials(LocalUser* user)
{
if (conn == NULL)
if (!Connect())
return false;
if (user->password.empty())
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (No password provided)", user->nick.c_str(), user->ident.c_str(), user->host.c_str());
return false;
}
int res;
// bind anonymously if no bind DN and authentication are given in the config
struct berval cred;
cred.bv_val = const_cast<char*>(password.c_str());
cred.bv_len = password.length();
if ((res = ldap_sasl_bind_s(conn, username.c_str(), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) != LDAP_SUCCESS)
{
if (res == LDAP_SERVER_DOWN)
{
// Attempt to reconnect if the connection dropped
if (verbose)
ServerInstance->SNO->WriteToSnoMask('a', "LDAP server has gone away - reconnecting...");
Connect();
res = ldap_sasl_bind_s(conn, username.c_str(), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL);
}
if (res != LDAP_SUCCESS)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP bind failed: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res));
ldap_unbind_ext(conn, NULL, NULL);
conn = NULL;
return false;
}
}
LDAPMessage *msg, *entry;
std::string what = (attribute + "=" + (useusername ? user->ident : user->nick));
if ((res = ldap_search_ext_s(conn, base.c_str(), searchscope, what.c_str(), NULL, 0, NULL, NULL, NULL, 0, &msg)) != LDAP_SUCCESS)
{
// Do a second search, based on password, if it contains a :
// That is, PASS <user>:<password> will work.
size_t pos = user->password.find(":");
if (pos != std::string::npos)
{
res = ldap_search_ext_s(conn, base.c_str(), searchscope, user->password.substr(0, pos).c_str(), NULL, 0, NULL, NULL, NULL, 0, &msg);
if (res)
{
// Trim the user: prefix, leaving just 'pass' for later password check
user->password = user->password.substr(pos + 1);
}
}
// It may have found based on user:pass check above.
if (!res)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP search failed: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res));
return false;
}
}
if (ldap_count_entries(conn, msg) > 1)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP search returned more than one result: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res));
ldap_msgfree(msg);
return false;
}
if ((entry = ldap_first_entry(conn, msg)) == NULL)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP search returned no results: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res));
ldap_msgfree(msg);
return false;
}
cred.bv_val = (char*)user->password.data();
cred.bv_len = user->password.length();
if ((res = ldap_sasl_bind_s(conn, ldap_get_dn(conn, entry), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) == LDAP_SUCCESS)
{
ldap_msgfree(msg);
ldapAuthed.set(user,1);
return true;
}
else
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (%s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res));
ldap_msgfree(msg);
return false;
}
}
ModResult OnCheckReady(LocalUser* user)
{
return ldapAuthed.get(user) ? MOD_RES_PASSTHRU : MOD_RES_DENY;
}
Version GetVersion()
{
return Version("Allow/Deny connections based upon answer from LDAP server", VF_VENDOR);
}
};
MODULE_INIT(ModuleLDAPAuth)
|
