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
|
/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
* Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
* Copyright (C) 2007 Carsten Valdemar Munk <carsten.munk+inspircd@gmail.com>
*
* This file is part of InspIRCd. InspIRCd 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.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "users.h"
#include "channels.h"
#include "modules.h"
#include <ldap.h>
#ifdef _WIN32
# pragma comment(lib, "ldap.lib")
# pragma comment(lib, "lber.lib")
#endif
/* $LinkerFlags: -lldap */
struct RAIILDAPString
{
char *str;
RAIILDAPString(char *Str)
: str(Str)
{
}
~RAIILDAPString()
{
ldap_memfree(str);
}
operator char*()
{
return str;
}
operator std::string()
{
return str;
}
};
class ModuleLDAPAuth : public Module
{
std::string base;
std::string ldapserver;
std::string username;
std::string password;
std::string attribute;
int searchscope;
LDAP *conn;
bool HandleOper(LocalUser* user, const std::string& opername, const std::string& inputpass)
{
OperIndex::iterator it = ServerInstance->Config->oper_blocks.find(opername);
if (it == ServerInstance->Config->oper_blocks.end())
return false;
ConfigTag* tag = it->second->oper_block;
if (!tag)
return false;
std::string acceptedhosts = tag->getString("host");
std::string hostname = user->ident + "@" + user->host;
if (!InspIRCd::MatchMask(acceptedhosts, hostname, user->GetIPString()))
return false;
if (!LookupOper(opername, inputpass))
return false;
user->Oper(it->second);
return true;
}
public:
ModuleLDAPAuth()
: conn(NULL)
{
}
~ModuleLDAPAuth()
{
if (conn)
ldap_unbind_ext(conn, NULL, NULL);
}
void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
{
ConfigTag* tag = ServerInstance->Config->ConfValue("ldapoper");
base = tag->getString("baserdn");
ldapserver = tag->getString("server");
std::string scope = tag->getString("searchscope");
username = tag->getString("binddn");
password = tag->getString("bindauth");
attribute = tag->getString("attribute");
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)
{
conn = NULL;
return false;
}
res = ldap_set_option(conn, LDAP_OPT_PROTOCOL_VERSION, (void *)&v);
if (res != LDAP_SUCCESS)
{
ldap_unbind_ext(conn, NULL, NULL);
conn = NULL;
return false;
}
return true;
}
ModResult OnPreCommand(std::string& command, std::vector<std::string>& parameters, LocalUser* user, bool validated, const std::string& original_line) CXX11_OVERRIDE
{
if (validated && command == "OPER" && parameters.size() >= 2)
{
if (HandleOper(user, parameters[0], parameters[1]))
return MOD_RES_DENY;
}
return MOD_RES_PASSTHRU;
}
bool LookupOper(const std::string& opername, const std::string& opassword)
{
if (conn == NULL)
if (!Connect())
return false;
int res;
char* authpass = strdup(password.c_str());
// bind anonymously if no bind DN and authentication are given in the config
struct berval cred;
cred.bv_val = authpass;
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
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)
{
free(authpass);
ldap_unbind_ext(conn, NULL, NULL);
conn = NULL;
return false;
}
}
free(authpass);
LDAPMessage *msg, *entry;
std::string what = attribute + "=" + opername;
if ((res = ldap_search_ext_s(conn, base.c_str(), searchscope, what.c_str(), NULL, 0, NULL, NULL, NULL, 0, &msg)) != LDAP_SUCCESS)
{
return false;
}
if (ldap_count_entries(conn, msg) > 1)
{
ldap_msgfree(msg);
return false;
}
if ((entry = ldap_first_entry(conn, msg)) == NULL)
{
ldap_msgfree(msg);
return false;
}
authpass = strdup(opassword.c_str());
cred.bv_val = authpass;
cred.bv_len = opassword.length();
RAIILDAPString DN(ldap_get_dn(conn, entry));
if ((res = ldap_sasl_bind_s(conn, DN, LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) == LDAP_SUCCESS)
{
free(authpass);
ldap_msgfree(msg);
return true;
}
else
{
free(authpass);
ldap_msgfree(msg);
return false;
}
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Adds the ability to authenticate opers via LDAP", VF_VENDOR);
}
};
MODULE_INIT(ModuleLDAPAuth)
|
