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
|
/*
Unix SMB/Netbios implementation.
Version 3.0
handle GENSEC authentication, server side
Copyright (C) Andrew Tridgell 2001
Copyright (C) Andrew Bartlett 2001-2003,2011
Copyright (C) Simo Sorce 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 "auth.h"
#include "../lib/tsocket/tsocket.h"
#include "auth/gensec/gensec.h"
#include "lib/param/param.h"
#ifdef HAVE_KRB5
#include "libcli/auth/krb5_wrap.h"
#endif
#include "librpc/crypto/gse.h"
#include "auth/credentials/credentials.h"
static NTSTATUS auth3_generate_session_info_pac(struct auth4_context *auth_ctx,
TALLOC_CTX *mem_ctx,
struct smb_krb5_context *smb_krb5_context,
DATA_BLOB *pac_blob,
const char *princ_name,
const struct tsocket_address *remote_address,
uint32_t session_info_flags,
struct auth_session_info **session_info)
{
TALLOC_CTX *tmp_ctx;
struct PAC_DATA *pac_data = NULL;
struct PAC_LOGON_INFO *logon_info = NULL;
unsigned int i;
bool is_mapped;
bool is_guest;
char *ntuser;
char *ntdomain;
char *username;
char *rhost;
struct passwd *pw;
NTSTATUS status;
int rc;
tmp_ctx = talloc_new(mem_ctx);
if (!tmp_ctx) {
return NT_STATUS_NO_MEMORY;
}
if (pac_blob) {
#ifdef HAVE_KRB5
status = kerberos_decode_pac(tmp_ctx,
*pac_blob,
NULL, NULL, NULL, NULL, 0, &pac_data);
#else
status = NT_STATUS_ACCESS_DENIED;
#endif
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
/* get logon name and logon info */
for (i = 0; i < pac_data->num_buffers; i++) {
struct PAC_BUFFER *data_buf = &pac_data->buffers[i];
switch (data_buf->type) {
case PAC_TYPE_LOGON_INFO:
if (!data_buf->info) {
break;
}
logon_info = data_buf->info->logon_info.info;
break;
default:
break;
}
}
if (!logon_info) {
DEBUG(1, ("Invalid PAC data, missing logon info!\n"));
status = NT_STATUS_NOT_FOUND;
goto done;
}
}
rc = get_remote_hostname(remote_address,
&rhost,
tmp_ctx);
if (rc < 0) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
if (strequal(rhost, "UNKNOWN")) {
rhost = tsocket_address_inet_addr_string(remote_address,
tmp_ctx);
if (rhost == NULL) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
}
status = get_user_from_kerberos_info(tmp_ctx, rhost,
princ_name, logon_info,
&is_mapped, &is_guest,
&ntuser, &ntdomain,
&username, &pw);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to map kerberos principal to system user "
"(%s)\n", nt_errstr(status)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
/* save the PAC data if we have it */
if (logon_info) {
netsamlogon_cache_store(ntuser, &logon_info->info3);
}
status = make_session_info_krb5(mem_ctx,
ntuser, ntdomain, username, pw,
logon_info, is_guest, is_mapped, NULL /* No session key for now, caller will sort it out */,
session_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to map kerberos pac to server info (%s)\n",
nt_errstr(status)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
DEBUG(5, (__location__ "OK: user: %s domain: %s client: %s\n",
ntuser, ntdomain, rhost));
status = NT_STATUS_OK;
done:
TALLOC_FREE(tmp_ctx);
return status;
}
NTSTATUS auth_generic_prepare(TALLOC_CTX *mem_ctx,
const struct tsocket_address *remote_address,
struct gensec_security **gensec_security_out)
{
struct gensec_security *gensec_security;
struct auth_context *auth_context;
NTSTATUS nt_status;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
nt_status = make_auth_context_subsystem(tmp_ctx, &auth_context);
if (!NT_STATUS_IS_OK(nt_status)) {
TALLOC_FREE(tmp_ctx);
return nt_status;
}
if (auth_context->prepare_gensec) {
nt_status = auth_context->prepare_gensec(tmp_ctx,
&gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
TALLOC_FREE(tmp_ctx);
return nt_status;
}
} else {
struct gensec_settings *gensec_settings;
struct loadparm_context *lp_ctx;
struct cli_credentials *server_credentials;
struct auth4_context *auth4_context = talloc_zero(tmp_ctx, struct auth4_context);
if (auth4_context == NULL) {
DEBUG(10, ("failed to allocate auth4_context failed\n"));
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
auth4_context->generate_session_info_pac = auth3_generate_session_info_pac;
lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_context());
if (lp_ctx == NULL) {
DEBUG(10, ("loadparm_init_s3 failed\n"));
TALLOC_FREE(tmp_ctx);
return NT_STATUS_INVALID_SERVER_STATE;
}
gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
if (lp_ctx == NULL) {
DEBUG(10, ("lpcfg_gensec_settings failed\n"));
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
gensec_settings->backends = talloc_zero_array(gensec_settings, struct gensec_security_ops *, 3);
if (gensec_settings->backends == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
gensec_settings->backends[0] = &gensec_ntlmssp3_server_ops;
#if defined(HAVE_KRB5) && defined(HAVE_GSS_WRAP_IOV)
gensec_settings->backends[1] = &gensec_gse_krb5_security_ops;
#endif
/*
* This is anonymous for now, because we just use it
* to set the kerberos state at the moment
*/
server_credentials = cli_credentials_init_anon(tmp_ctx);
if (!server_credentials) {
DEBUG(0, ("auth_generic_prepare: Failed to init server credentials\n"));
return NT_STATUS_NO_MEMORY;
}
cli_credentials_set_conf(server_credentials, lp_ctx);
if (lp_security() == SEC_ADS || USE_KERBEROS_KEYTAB) {
cli_credentials_set_kerberos_state(server_credentials, CRED_AUTO_USE_KERBEROS);
} else {
cli_credentials_set_kerberos_state(server_credentials, CRED_DONT_USE_KERBEROS);
}
nt_status = gensec_server_start(tmp_ctx, gensec_settings,
auth4_context, &gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
TALLOC_FREE(tmp_ctx);
return nt_status;
}
gensec_set_credentials(gensec_security, server_credentials);
talloc_unlink(tmp_ctx, lp_ctx);
talloc_unlink(tmp_ctx, server_credentials);
talloc_unlink(tmp_ctx, gensec_settings);
talloc_unlink(tmp_ctx, auth4_context);
}
nt_status = gensec_set_remote_address(gensec_security,
remote_address);
if (!NT_STATUS_IS_OK(nt_status)) {
TALLOC_FREE(tmp_ctx);
return nt_status;
}
*gensec_security_out = talloc_steal(mem_ctx, gensec_security);
TALLOC_FREE(tmp_ctx);
return NT_STATUS_OK;
}
|
