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
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
|
/*
Unix SMB/CIFS implementation.
Samba kpasswd implementation
Copyright (c) 2016 Andreas Schneider <asn@samba.org>
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 "smbd/service_task.h"
#include "param/param.h"
#include "auth/auth.h"
#include "auth/gensec/gensec.h"
#include "kdc/kdc-server.h"
#include "kdc/kpasswd_glue.h"
#include "kdc/kpasswd-service.h"
#include "kdc/kpasswd-helper.h"
static krb5_error_code kpasswd_change_password(struct kdc_server *kdc,
TALLOC_CTX *mem_ctx,
struct auth_session_info *session_info,
DATA_BLOB *password,
DATA_BLOB *kpasswd_reply,
const char **error_string)
{
NTSTATUS status;
NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
enum samPwdChangeReason reject_reason;
const char *reject_string = NULL;
struct samr_DomInfo1 *dominfo;
bool ok;
status = samdb_kpasswd_change_password(mem_ctx,
kdc->task->lp_ctx,
kdc->task->event_ctx,
kdc->samdb,
session_info,
password,
&reject_reason,
&dominfo,
&reject_string,
&result);
if (!NT_STATUS_IS_OK(status)) {
ok = kpasswd_make_error_reply(mem_ctx,
KRB5_KPASSWD_ACCESSDENIED,
reject_string,
kpasswd_reply);
if (!ok) {
*error_string = "Failed to create reply";
return KRB5_KPASSWD_HARDERROR;
}
/* We want to send an an authenticated packet. */
return 0;
}
ok = kpasswd_make_pwchange_reply(mem_ctx,
result,
reject_reason,
dominfo,
kpasswd_reply);
if (!ok) {
*error_string = "Failed to create reply";
return KRB5_KPASSWD_HARDERROR;
}
return 0;
}
static krb5_error_code kpasswd_set_password(struct kdc_server *kdc,
TALLOC_CTX *mem_ctx,
struct auth_session_info *session_info,
DATA_BLOB *decoded_data,
DATA_BLOB *kpasswd_reply,
const char **error_string)
{
krb5_context context = kdc->smb_krb5_context->krb5_context;
krb5_error_code code;
krb5_principal target_principal;
ChangePasswdDataMS chpw = {};
size_t chpw_len = 0;
DATA_BLOB password = data_blob_null;
enum samPwdChangeReason reject_reason = SAM_PWD_CHANGE_NO_ERROR;
struct samr_DomInfo1 *dominfo = NULL;
char *target_principal_string = NULL;
bool is_service_principal = false;
NTSTATUS status;
bool ok;
code = decode_ChangePasswdDataMS(decoded_data->data,
decoded_data->length,
&chpw,
&chpw_len);
if (code != 0) {
DBG_WARNING("decode_ChangePasswdDataMS failed\n");
ok = kpasswd_make_error_reply(mem_ctx,
KRB5_KPASSWD_MALFORMED,
"Failed to decode packet",
kpasswd_reply);
if (!ok) {
*error_string = "Failed to create reply";
return KRB5_KPASSWD_HARDERROR;
}
return 0;
}
ok = convert_string_talloc_handle(mem_ctx,
lpcfg_iconv_handle(kdc->task->lp_ctx),
CH_UTF8,
CH_UTF16,
(const char *)chpw.newpasswd.data,
chpw.newpasswd.length,
(void **)&password.data,
&password.length);
if (!ok) {
free_ChangePasswdDataMS(&chpw);
DBG_WARNING("String conversion failed\n");
*error_string = "String conversion failed";
return KRB5_KPASSWD_HARDERROR;
}
if ((chpw.targname != NULL && chpw.targrealm == NULL) ||
(chpw.targname == NULL && chpw.targrealm != NULL)) {
free_ChangePasswdDataMS(&chpw);
ok = kpasswd_make_error_reply(mem_ctx,
KRB5_KPASSWD_MALFORMED,
"Realm and principal must be "
"both present, or neither present",
kpasswd_reply);
if (!ok) {
*error_string = "Failed to create reply";
return KRB5_KPASSWD_HARDERROR;
}
return 0;
}
if (chpw.targname != NULL && chpw.targrealm != NULL) {
code = krb5_build_principal_ext(context,
&target_principal,
strlen(*chpw.targrealm),
*chpw.targrealm,
0);
if (code != 0) {
free_ChangePasswdDataMS(&chpw);
return kpasswd_make_error_reply(mem_ctx,
KRB5_KPASSWD_MALFORMED,
"Failed to parse principal",
kpasswd_reply);
}
code = copy_PrincipalName(chpw.targname,
&target_principal->name);
if (code != 0) {
free_ChangePasswdDataMS(&chpw);
krb5_free_principal(context, target_principal);
return kpasswd_make_error_reply(mem_ctx,
KRB5_KPASSWD_MALFORMED,
"Failed to parse principal",
kpasswd_reply);
}
} else {
free_ChangePasswdDataMS(&chpw);
return kpasswd_change_password(kdc,
mem_ctx,
session_info,
&password,
kpasswd_reply,
error_string);
}
free_ChangePasswdDataMS(&chpw);
if (target_principal->name.name_string.len >= 2) {
is_service_principal = true;
code = krb5_unparse_name_short(context,
target_principal,
&target_principal_string);
} else {
code = krb5_unparse_name(context,
target_principal,
&target_principal_string);
}
krb5_free_principal(context, target_principal);
if (code != 0) {
ok = kpasswd_make_error_reply(mem_ctx,
KRB5_KPASSWD_MALFORMED,
"Failed to parse principal",
kpasswd_reply);
if (!ok) {
*error_string = "Failed to create reply";
return KRB5_KPASSWD_HARDERROR;
}
}
status = kpasswd_samdb_set_password(mem_ctx,
kdc->task->event_ctx,
kdc->task->lp_ctx,
session_info,
is_service_principal,
target_principal_string,
&password,
&reject_reason,
&dominfo);
if (!NT_STATUS_IS_OK(status)) {
DBG_ERR("kpasswd_samdb_set_password failed - %s\n",
nt_errstr(status));
}
ok = kpasswd_make_pwchange_reply(mem_ctx,
status,
reject_reason,
dominfo,
kpasswd_reply);
if (!ok) {
*error_string = "Failed to create reply";
return KRB5_KPASSWD_HARDERROR;
}
return 0;
}
krb5_error_code kpasswd_handle_request(struct kdc_server *kdc,
TALLOC_CTX *mem_ctx,
struct gensec_security *gensec_security,
uint16_t verno,
DATA_BLOB *decoded_data,
DATA_BLOB *kpasswd_reply,
const char **error_string)
{
struct auth_session_info *session_info;
NTSTATUS status;
status = gensec_session_info(gensec_security,
mem_ctx,
&session_info);
if (!NT_STATUS_IS_OK(status)) {
*error_string = talloc_asprintf(mem_ctx,
"gensec_session_info failed - %s",
nt_errstr(status));
return KRB5_KPASSWD_HARDERROR;
}
switch(verno) {
case KRB5_KPASSWD_VERS_CHANGEPW: {
DATA_BLOB password = data_blob_null;
bool ok;
ok = convert_string_talloc_handle(mem_ctx,
lpcfg_iconv_handle(kdc->task->lp_ctx),
CH_UTF8,
CH_UTF16,
(const char *)decoded_data->data,
decoded_data->length,
(void **)&password.data,
&password.length);
if (!ok) {
*error_string = "String conversion failed!";
DBG_WARNING("%s\n", *error_string);
return KRB5_KPASSWD_HARDERROR;
}
return kpasswd_change_password(kdc,
mem_ctx,
session_info,
&password,
kpasswd_reply,
error_string);
}
case KRB5_KPASSWD_VERS_SETPW: {
return kpasswd_set_password(kdc,
mem_ctx,
session_info,
decoded_data,
kpasswd_reply,
error_string);
}
default:
*error_string = talloc_asprintf(mem_ctx,
"Protocol version %u not supported",
verno);
return KRB5_KPASSWD_BAD_VERSION;
}
return 0;
}
|
