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
|
/*
* GSSAPI Acceptor
* DCERPC Server functions
* 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 "rpc_server/dcesrv_gssapi.h"
#include "../librpc/gen_ndr/ndr_krb5pac.h"
#include "librpc/crypto/gse.h"
#include "auth.h"
NTSTATUS gssapi_server_auth_start(TALLOC_CTX *mem_ctx,
bool do_sign,
bool do_seal,
bool is_dcerpc,
DATA_BLOB *token_in,
DATA_BLOB *token_out,
struct gse_context **ctx)
{
struct gse_context *gse_ctx = NULL;
uint32_t add_flags = 0;
NTSTATUS status;
if (is_dcerpc) {
add_flags = GSS_C_DCE_STYLE;
}
/* Let's init the gssapi machinery for this connection */
/* passing a NULL server name means the server will try
* to accept any connection regardless of the name used as
* long as it can find a decryption key */
/* by passing NULL, the code will attempt to set a default
* keytab based on configuration options */
status = gse_init_server(mem_ctx, do_sign, do_seal,
add_flags, NULL, &gse_ctx);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to init dcerpc gssapi server (%s)\n",
nt_errstr(status)));
return status;
}
status = gse_get_server_auth_token(mem_ctx, gse_ctx,
token_in, token_out);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to parse initial client token (%s)\n",
nt_errstr(status)));
goto done;
}
*ctx = gse_ctx;
status = NT_STATUS_OK;
done:
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(gse_ctx);
}
return status;
}
NTSTATUS gssapi_server_step(struct gse_context *gse_ctx,
TALLOC_CTX *mem_ctx,
DATA_BLOB *token_in,
DATA_BLOB *token_out)
{
NTSTATUS status;
status = gse_get_server_auth_token(mem_ctx, gse_ctx,
token_in, token_out);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (gse_require_more_processing(gse_ctx)) {
/* ask for next leg */
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
return NT_STATUS_OK;
}
NTSTATUS gssapi_server_check_flags(struct gse_context *gse_ctx)
{
return gse_verify_server_auth_flags(gse_ctx);
}
NTSTATUS gssapi_server_get_user_info(struct gse_context *gse_ctx,
TALLOC_CTX *mem_ctx,
struct client_address *client_id,
struct auth_serversupplied_info **server_info)
{
TALLOC_CTX *tmp_ctx;
DATA_BLOB auth_data;
time_t tgs_authtime;
NTTIME tgs_authtime_nttime;
DATA_BLOB pac;
struct PAC_DATA *pac_data;
struct PAC_LOGON_NAME *logon_name = NULL;
struct PAC_LOGON_INFO *logon_info = NULL;
enum ndr_err_code ndr_err;
unsigned int i;
bool is_mapped;
bool is_guest;
char *princ_name;
char *ntuser;
char *ntdomain;
char *username;
struct passwd *pw;
NTSTATUS status;
bool bret;
tmp_ctx = talloc_new(mem_ctx);
if (!tmp_ctx) {
return NT_STATUS_NO_MEMORY;
}
status = gse_get_authz_data(gse_ctx, tmp_ctx, &auth_data);
if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
/* TODO: Fetch user by principal name ? */
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
bret = unwrap_pac(tmp_ctx, &auth_data, &pac);
if (!bret) {
DEBUG(1, ("Failed to unwrap PAC\n"));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
status = gse_get_client_name(gse_ctx, tmp_ctx, &princ_name);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
status = gse_get_authtime(gse_ctx, &tgs_authtime);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
pac_data = talloc_zero(tmp_ctx, struct PAC_DATA);
if (!pac_data) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
ndr_err = ndr_pull_struct_blob(&pac, pac_data, pac_data,
(ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(1, ("Failed to parse the PAC for %s\n", princ_name));
status = ndr_map_error2ntstatus(ndr_err);
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;
case PAC_TYPE_LOGON_NAME:
logon_name = &data_buf->info->logon_name;
break;
default:
break;
}
}
if (!logon_info) {
DEBUG(1, ("Invalid PAC data, missing logon info!\n"));
status = NT_STATUS_NOT_FOUND;
goto done;
}
if (!logon_name) {
DEBUG(1, ("Invalid PAC data, missing logon info!\n"));
status = NT_STATUS_NOT_FOUND;
goto done;
}
/* check time */
if (tgs_authtime_nttime != logon_name->logon_time) {
DEBUG(1, ("Logon time mismatch between ticket and PAC!\n"
"PAC Time = %s | Ticket Time = %s\n",
nt_time_string(tmp_ctx, logon_name->logon_time),
nt_time_string(tmp_ctx, tgs_authtime_nttime)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
/* TODO: Should we check princ_name against account_name in
* logon_name ? Are they supposed to be identical, or can an
* account_name be different from the UPN ? */
status = get_user_from_kerberos_info(tmp_ctx, client_id->name,
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;
}
/* TODO: save PAC data in netsamlogon cache ? */
status = make_server_info_krb5(mem_ctx,
ntuser, ntdomain, username, pw,
logon_info, is_guest, server_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, client_id->name));
status = NT_STATUS_OK;
done:
TALLOC_FREE(tmp_ctx);
return status;
}
|
