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
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
/*
Unix SMB/CIFS implementation.
Authenticate against Samba4's auth subsystem
Copyright (C) Volker Lendecke 2008
Copyright (C) Andrew Bartlett 2010
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; either version 3 of the License, or
(at your option) any later version.
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 "includes.h"
#include "source3/include/auth.h"
#include "source4/auth/auth.h"
#include "auth/auth_sam_reply.h"
#include "param/param.h"
#include "source4/lib/events/events.h"
#include "source4/lib/messaging/messaging.h"
#include "auth/gensec/gensec.h"
#include "auth/credentials/credentials.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
static NTSTATUS check_samba4_security(const struct auth_context *auth_context,
void *my_private_data,
TALLOC_CTX *mem_ctx,
const struct auth_usersupplied_info *user_info,
struct auth_serversupplied_info **server_info)
{
TALLOC_CTX *frame = talloc_stackframe();
struct netr_SamInfo3 *info3 = NULL;
NTSTATUS nt_status;
struct auth_user_info_dc *user_info_dc;
struct auth4_context *auth4_context;
struct loadparm_context *lp_ctx;
lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
if (lp_ctx == NULL) {
DEBUG(10, ("loadparm_init_s3 failed\n"));
talloc_free(frame);
return NT_STATUS_INVALID_SERVER_STATE;
}
/* We create a private tevent context here to avoid nested loops in
* the s3 one, as that may not be expected */
nt_status = auth_context_create(mem_ctx,
s4_event_context_init(frame), NULL,
lp_ctx,
&auth4_context);
NT_STATUS_NOT_OK_RETURN(nt_status);
nt_status = auth_context_set_challenge(auth4_context, auth_context->challenge.data, "auth_samba4");
NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, auth4_context);
nt_status = auth_check_password(auth4_context, auth4_context, user_info, &user_info_dc);
NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, auth4_context);
nt_status = auth_convert_user_info_dc_saminfo3(mem_ctx,
user_info_dc,
&info3);
if (NT_STATUS_IS_OK(nt_status)) {
/* We need the strings from the server_info to be valid as long as the info3 is around */
talloc_steal(info3, user_info_dc);
}
talloc_free(auth4_context);
if (!NT_STATUS_IS_OK(nt_status)) {
goto done;
}
nt_status = make_server_info_info3(mem_ctx, user_info->client.account_name,
user_info->mapped.domain_name, server_info,
info3);
if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(10, ("make_server_info_info3 failed: %s\n",
nt_errstr(nt_status)));
TALLOC_FREE(frame);
return nt_status;
}
nt_status = NT_STATUS_OK;
done:
TALLOC_FREE(frame);
return nt_status;
}
/* Hook to allow GENSEC to handle blob-based authentication
* mechanisms, without directly linking the mechansim code */
static NTSTATUS prepare_gensec(TALLOC_CTX *mem_ctx,
struct gensec_security **gensec_context)
{
NTSTATUS status;
struct loadparm_context *lp_ctx;
struct tevent_context *event_ctx;
TALLOC_CTX *frame = talloc_stackframe();
struct gensec_security *gensec_ctx;
struct imessaging_context *msg_ctx;
struct cli_credentials *server_credentials;
struct server_id *server_id;
lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
if (lp_ctx == NULL) {
DEBUG(1, ("loadparm_init_s3 failed\n"));
TALLOC_FREE(frame);
return NT_STATUS_INVALID_SERVER_STATE;
}
event_ctx = s4_event_context_init(frame);
if (event_ctx == NULL) {
DEBUG(1, ("s4_event_context_init failed\n"));
TALLOC_FREE(frame);
return NT_STATUS_INVALID_SERVER_STATE;
}
server_id = new_server_id_task(frame);
if (server_id == NULL) {
DEBUG(1, ("new_server_id_task failed\n"));
TALLOC_FREE(frame);
return NT_STATUS_INVALID_SERVER_STATE;
}
msg_ctx = imessaging_init(frame,
lp_ctx,
*server_id,
event_ctx, true);
if (msg_ctx == NULL) {
DEBUG(1, ("imessaging_init failed\n"));
TALLOC_FREE(frame);
return NT_STATUS_INVALID_SERVER_STATE;
}
talloc_reparent(frame, msg_ctx, server_id);
server_credentials
= cli_credentials_init(frame);
if (!server_credentials) {
DEBUG(1, ("Failed to init server credentials"));
TALLOC_FREE(frame);
return NT_STATUS_INVALID_SERVER_STATE;
}
cli_credentials_set_conf(server_credentials, lp_ctx);
status = cli_credentials_set_machine_account(server_credentials, lp_ctx);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status)));
talloc_free(server_credentials);
server_credentials = NULL;
}
status = samba_server_gensec_start(mem_ctx,
event_ctx, msg_ctx,
lp_ctx, server_credentials, "cifs",
&gensec_ctx);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
talloc_reparent(frame, gensec_ctx, msg_ctx);
talloc_reparent(frame, gensec_ctx, event_ctx);
talloc_reparent(frame, gensec_ctx, lp_ctx);
talloc_reparent(frame, gensec_ctx, server_credentials);
gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
gensec_want_feature(gensec_ctx, GENSEC_FEATURE_UNIX_TOKEN);
*gensec_context = gensec_ctx;
TALLOC_FREE(frame);
return status;
}
/* Hook to allow handling of NTLM authentication for AD operation
* without directly linking the s4 auth stack */
static NTSTATUS make_auth4_context_s4(TALLOC_CTX *mem_ctx,
struct auth4_context **auth4_context)
{
NTSTATUS status;
struct loadparm_context *lp_ctx;
struct tevent_context *event_ctx;
TALLOC_CTX *frame = talloc_stackframe();
struct imessaging_context *msg_ctx;
struct server_id *server_id;
lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
if (lp_ctx == NULL) {
DEBUG(1, ("loadparm_init_s3 failed\n"));
TALLOC_FREE(frame);
return NT_STATUS_INVALID_SERVER_STATE;
}
event_ctx = s4_event_context_init(frame);
if (event_ctx == NULL) {
DEBUG(1, ("s4_event_context_init failed\n"));
TALLOC_FREE(frame);
return NT_STATUS_INVALID_SERVER_STATE;
}
server_id = new_server_id_task(frame);
if (server_id == NULL) {
DEBUG(1, ("new_server_id_task failed\n"));
TALLOC_FREE(frame);
return NT_STATUS_INVALID_SERVER_STATE;
}
msg_ctx = imessaging_init(frame,
lp_ctx,
*server_id,
event_ctx, true);
if (msg_ctx == NULL) {
DEBUG(1, ("imessaging_init failed\n"));
TALLOC_FREE(frame);
return NT_STATUS_INVALID_SERVER_STATE;
}
talloc_reparent(frame, msg_ctx, server_id);
status = auth_context_create(mem_ctx,
event_ctx,
msg_ctx,
lp_ctx,
auth4_context);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to start auth server code: %s\n", nt_errstr(status)));
TALLOC_FREE(frame);
return status;
}
talloc_reparent(frame, *auth4_context, msg_ctx);
talloc_reparent(frame, *auth4_context, event_ctx);
talloc_reparent(frame, *auth4_context, lp_ctx);
TALLOC_FREE(frame);
return status;
}
/* module initialisation */
static NTSTATUS auth_init_samba4(struct auth_context *auth_context,
const char *param,
auth_methods **auth_method)
{
struct auth_methods *result;
gensec_init();
result = talloc_zero(auth_context, struct auth_methods);
if (result == NULL) {
return NT_STATUS_NO_MEMORY;
}
result->name = "samba4";
result->auth = check_samba4_security;
result->prepare_gensec = prepare_gensec;
result->make_auth4_context = make_auth4_context_s4;
*auth_method = result;
return NT_STATUS_OK;
}
NTSTATUS auth_samba4_init(void)
{
smb_register_auth(AUTH_INTERFACE_VERSION, "samba4",
auth_init_samba4);
return NT_STATUS_OK;
}
|
