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
|
/*
Unix SMB/CIFS implementation.
KDC Server startup
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
Copyright (C) Andrew Tridgell 2005
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "smbd/service_task.h"
#include "lib/events/events.h"
#include "lib/socket/socket.h"
#include "kdc/kdc.h"
#include "system/network.h"
/*
handle fd events on a KDC socket
*/
static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *private)
{
NTSTATUS status;
struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
if (flags & EVENT_FD_WRITE) {
/* not sure on write events yet */
} else if (flags & EVENT_FD_READ) {
TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
DATA_BLOB blob = data_blob_talloc(tmp_ctx, NULL, 64 * 1024);
krb5_data reply;
size_t nread;
const char *src_addr;
int src_port;
struct sockaddr_in src_sock_addr;
struct ipv4_addr addr;
status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread, 0,
&src_addr, &src_port);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(tmp_ctx);
return;
}
talloc_steal(tmp_ctx, src_addr);
blob.length = nread;
DEBUG(2,("Received krb5 packet of length %d from %s:%d\n",
blob.length, src_addr, src_port));
/* TODO: This really should be in a utility function somewhere */
ZERO_STRUCT(src_sock_addr);
#ifdef HAVE_SOCK_SIN_LEN
src_sock_addr.sin_len = sizeof(src_sock_addr);
#endif
addr = interpret_addr2(src_addr);
src_sock_addr.sin_addr.s_addr = addr.addr;
src_sock_addr.sin_port = htons(src_port);
src_sock_addr.sin_family = PF_INET;
/* Call krb5 */
if (krb5_kdc_process_krb5_request(kdc_socket->kdc->krb5_context,
kdc_socket->kdc->config,
blob.data, blob.length,
&reply,
src_addr,
&src_sock_addr) != -1) {
size_t sendlen = reply.length;
DATA_BLOB reply_blob;
reply_blob.data = reply.data;
reply_blob.length = reply.length;
socket_sendto(kdc_socket->sock, &reply_blob, &sendlen, 0,
src_addr, src_port);
krb5_data_free(&reply);
}
talloc_free(tmp_ctx);
}
}
/*
start listening on the given address
*/
static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address)
{
struct kdc_socket *kdc_socket;
NTSTATUS status;
kdc_socket = talloc(kdc, struct kdc_socket);
NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(kdc_socket);
return status;
}
kdc_socket->kdc = kdc;
talloc_steal(kdc_socket, kdc_socket->sock);
kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
socket_get_fd(kdc_socket->sock), 0,
kdc_socket_handler, kdc_socket);
EVENT_FD_READABLE(kdc_socket->fde);
status = socket_listen(kdc_socket->sock, address, lp_krb5_port(), 0, 0);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Failed to bind to %s:%d - %s\n",
address, lp_krb5_port(), nt_errstr(status)));
talloc_free(kdc_socket);
return status;
}
return NT_STATUS_OK;
}
/*
setup our listening sockets on the configured network interfaces
*/
NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc)
{
int num_interfaces = iface_count();
TALLOC_CTX *tmp_ctx = talloc_new(kdc);
NTSTATUS status;
/* if we are allowing incoming packets from any address, then
we need to bind to the wildcard address */
if (!lp_bind_interfaces_only()) {
status = kdc_add_socket(kdc, "0.0.0.0");
NT_STATUS_NOT_OK_RETURN(status);
} else {
int i;
for (i=0; i<num_interfaces; i++) {
const char *address = talloc_strdup(tmp_ctx, iface_n_ip(i));
status = kdc_add_socket(kdc, address);
NT_STATUS_NOT_OK_RETURN(status);
}
}
talloc_free(tmp_ctx);
return NT_STATUS_OK;
}
/*
startup the kdc task
*/
static void kdc_task_init(struct task_server *task)
{
struct kdc_server *kdc;
NTSTATUS status;
krb5_error_code ret;
if (iface_count() == 0) {
task_terminate(task, "kdc: no network interfaces configured");
return;
}
kdc = talloc(task, struct kdc_server);
if (kdc == NULL) {
task_terminate(task, "kdc: out of memory");
return;
}
kdc->task = task;
/* Setup the KDC configuration */
kdc->config = talloc(kdc, struct krb5_kdc_configuration);
if (!kdc->config) {
task_terminate(task, "kdc: out of memory");
return;
}
krb5_kdc_default_config(kdc->config);
initialize_krb5_error_table();
ret = krb5_init_context(&kdc->krb5_context);
if (ret) {
DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
error_message(ret)));
task_terminate(task, "kdc: krb5_init_context failed");
return;
}
/* TODO: Fill in the hdb and logging details */
kdc_openlog(kdc->krb5_context, kdc->config);
kdc->config->db = talloc(kdc->config, struct HDB *);
if (!kdc->config->db) {
task_terminate(task, "kdc: out of memory");
return;
}
kdc->config->num_db = 1;
ret = hdb_ldb_create(kdc->krb5_context, &kdc->config->db[0], lp_sam_url());
if (ret != 0) {
DEBUG(1, ("kdc_task_init: hdb_ldb_create fails: %s\n",
smb_get_krb5_error_message(kdc->krb5_context, ret, kdc)));
task_terminate(task, "kdc: hdb_ldb_create failed");
return;
}
/* start listening on the configured network interfaces */
status = kdc_startup_interfaces(kdc);
if (!NT_STATUS_IS_OK(status)) {
task_terminate(task, "kdc failed to setup interfaces");
return;
}
DEBUG(0, ("When I grow up, I want to be a KDC!\n"));
}
/*
called on startup of the KDC service
*/
static NTSTATUS kdc_init(struct event_context *event_ctx,
const struct model_ops *model_ops)
{
return task_server_startup(event_ctx, model_ops, kdc_task_init);
}
/* called at smbd startup - register ourselves as a server service */
NTSTATUS server_service_kdc_init(void)
{
return register_server_service("kdc", kdc_init);
}
|
