summaryrefslogtreecommitdiffstats
path: root/source3/winbindd/winbindd_dual_ndr.c
blob: e400b6110d4e73f98924f196c94aeebec32f7f99 (plain)
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
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
/*
   Unix SMB/CIFS implementation.

   Provide parent->child communication based on NDR marshalling

   Copyright (C) Volker Lendecke 2009

   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/>.
*/

/*
 * This file implements an RPC between winbind parent and child processes,
 * leveraging the autogenerated marshalling routines for MSRPC. This is not
 * MSRPC, as it does not go through the whole DCERPC fragmentation, we just
 * leverage much the same infrastructure we already have for it.
 */

#include "includes.h"
#include "winbindd/winbindd.h"
#include "winbindd/winbindd_proto.h"
#include "librpc/gen_ndr/srv_wbint.h"

struct wbint_bh_state {
	struct winbindd_domain *domain;
	struct winbindd_child *child;
};

static bool wbint_bh_is_connected(struct dcerpc_binding_handle *h)
{
	struct wbint_bh_state *hs = dcerpc_binding_handle_data(h,
				     struct wbint_bh_state);

	if (!hs->child) {
		return false;
	}

	return true;
}

static uint32_t wbint_bh_set_timeout(struct dcerpc_binding_handle *h,
				     uint32_t timeout)
{
	/* TODO: implement timeouts */
	return UINT32_MAX;
}

struct wbint_bh_raw_call_state {
	struct winbindd_domain *domain;
	uint32_t opnum;
	DATA_BLOB in_data;
	struct winbindd_request request;
	struct winbindd_response *response;
	DATA_BLOB out_data;
};

static void wbint_bh_raw_call_done(struct tevent_req *subreq);

static struct tevent_req *wbint_bh_raw_call_send(TALLOC_CTX *mem_ctx,
						  struct tevent_context *ev,
						  struct dcerpc_binding_handle *h,
						  const struct GUID *object,
						  uint32_t opnum,
						  uint32_t in_flags,
						  const uint8_t *in_data,
						  size_t in_length)
{
	struct wbint_bh_state *hs =
		dcerpc_binding_handle_data(h,
		struct wbint_bh_state);
	struct tevent_req *req;
	struct wbint_bh_raw_call_state *state;
	bool ok;
	struct tevent_req *subreq;

	req = tevent_req_create(mem_ctx, &state,
				struct wbint_bh_raw_call_state);
	if (req == NULL) {
		return NULL;
	}
	state->domain = hs->domain;
	state->opnum = opnum;
	state->in_data.data = discard_const_p(uint8_t, in_data);
	state->in_data.length = in_length;

	ok = wbint_bh_is_connected(h);
	if (!ok) {
		tevent_req_nterror(req, NT_STATUS_INVALID_CONNECTION);
		return tevent_req_post(req, ev);
	}

	if ((state->domain != NULL)
	    && wcache_fetch_ndr(state, state->domain, state->opnum,
				&state->in_data, &state->out_data)) {
		tevent_req_done(req);
		return tevent_req_post(req, ev);
	}

	state->request.cmd = WINBINDD_DUAL_NDRCMD;
	state->request.data.ndrcmd = state->opnum;
	state->request.extra_data.data = (char *)state->in_data.data;
	state->request.extra_len = state->in_data.length;

	subreq = wb_child_request_send(state, ev, hs->child,
				       &state->request);
	if (tevent_req_nomem(subreq, req)) {
		return tevent_req_post(req, ev);
	}
	tevent_req_set_callback(subreq, wbint_bh_raw_call_done, req);

	return req;
}

static void wbint_bh_raw_call_done(struct tevent_req *subreq)
{
	struct tevent_req *req =
		tevent_req_callback_data(subreq,
		struct tevent_req);
	struct wbint_bh_raw_call_state *state =
		tevent_req_data(req,
		struct wbint_bh_raw_call_state);
	int ret, err;

	ret = wb_child_request_recv(subreq, state, &state->response, &err);
	TALLOC_FREE(subreq);
	if (ret == -1) {
		NTSTATUS status = map_nt_error_from_unix(err);
		tevent_req_nterror(req, status);
		return;
	}

	state->out_data = data_blob_talloc(state,
		state->response->extra_data.data,
		state->response->length - sizeof(struct winbindd_response));
	if (state->response->extra_data.data && !state->out_data.data) {
		tevent_req_nomem(NULL, req);
		return;
	}

	if (state->domain != NULL) {
		wcache_store_ndr(state->domain, state->opnum,
				 &state->in_data, &state->out_data);
	}

	tevent_req_done(req);
}

static NTSTATUS wbint_bh_raw_call_recv(struct tevent_req *req,
					TALLOC_CTX *mem_ctx,
					uint8_t **out_data,
					size_t *out_length,
					uint32_t *out_flags)
{
	struct wbint_bh_raw_call_state *state =
		tevent_req_data(req,
		struct wbint_bh_raw_call_state);
	NTSTATUS status;

	if (tevent_req_is_nterror(req, &status)) {
		tevent_req_received(req);
		return status;
	}

	*out_data = talloc_move(mem_ctx, &state->out_data.data);
	*out_length = state->out_data.length;
	*out_flags = 0;
	tevent_req_received(req);
	return NT_STATUS_OK;
}

struct wbint_bh_disconnect_state {
	uint8_t _dummy;
};

static struct tevent_req *wbint_bh_disconnect_send(TALLOC_CTX *mem_ctx,
						struct tevent_context *ev,
						struct dcerpc_binding_handle *h)
{
	struct wbint_bh_state *hs = dcerpc_binding_handle_data(h,
				     struct wbint_bh_state);
	struct tevent_req *req;
	struct wbint_bh_disconnect_state *state;
	bool ok;

	req = tevent_req_create(mem_ctx, &state,
				struct wbint_bh_disconnect_state);
	if (req == NULL) {
		return NULL;
	}

	ok = wbint_bh_is_connected(h);
	if (!ok) {
		tevent_req_nterror(req, NT_STATUS_INVALID_CONNECTION);
		return tevent_req_post(req, ev);
	}

	/*
	 * TODO: do a real async disconnect ...
	 *
	 * For now the caller needs to free rpc_cli
	 */
	hs->child = NULL;

	tevent_req_done(req);
	return tevent_req_post(req, ev);
}

static NTSTATUS wbint_bh_disconnect_recv(struct tevent_req *req)
{
	NTSTATUS status;

	if (tevent_req_is_nterror(req, &status)) {
		tevent_req_received(req);
		return status;
	}

	tevent_req_received(req);
	return NT_STATUS_OK;
}

static bool wbint_bh_ref_alloc(struct dcerpc_binding_handle *h)
{
	return true;
}

static void wbint_bh_do_ndr_print(struct dcerpc_binding_handle *h,
				  int ndr_flags,
				  const void *_struct_ptr,
				  const struct ndr_interface_call *call)
{
	void *struct_ptr = discard_const(_struct_ptr);

	if (DEBUGLEVEL < 10) {
		return;
	}

	if (ndr_flags & NDR_IN) {
		ndr_print_function_debug(call->ndr_print,
					 call->name,
					 ndr_flags,
					 struct_ptr);
	}
	if (ndr_flags & NDR_OUT) {
		ndr_print_function_debug(call->ndr_print,
					 call->name,
					 ndr_flags,
					 struct_ptr);
	}
}

static const struct dcerpc_binding_handle_ops wbint_bh_ops = {
	.name			= "wbint",
	.is_connected		= wbint_bh_is_connected,
	.set_timeout		= wbint_bh_set_timeout,
	.raw_call_send		= wbint_bh_raw_call_send,
	.raw_call_recv		= wbint_bh_raw_call_recv,
	.disconnect_send	= wbint_bh_disconnect_send,
	.disconnect_recv	= wbint_bh_disconnect_recv,

	.ref_alloc		= wbint_bh_ref_alloc,
	.do_ndr_print		= wbint_bh_do_ndr_print,
};

/* initialise a wbint binding handle */
struct dcerpc_binding_handle *wbint_binding_handle(TALLOC_CTX *mem_ctx,
						struct winbindd_domain *domain,
						struct winbindd_child *child)
{
	struct dcerpc_binding_handle *h;
	struct wbint_bh_state *hs;

	h = dcerpc_binding_handle_create(mem_ctx,
					 &wbint_bh_ops,
					 NULL,
					 &ndr_table_wbint,
					 &hs,
					 struct wbint_bh_state,
					 __location__);
	if (h == NULL) {
		return NULL;
	}
	hs->domain = domain;
	hs->child = child;

	return h;
}

enum winbindd_result winbindd_dual_ndrcmd(struct winbindd_domain *domain,
					  struct winbindd_cli_state *state)
{
	struct pipes_struct p;
	struct api_struct *fns;
	int num_fns;
	bool ret;

	wbint_get_pipe_fns(&fns, &num_fns);

	if (state->request->data.ndrcmd >= num_fns) {
		return WINBINDD_ERROR;
	}

	DEBUG(10, ("winbindd_dual_ndrcmd: Running command %s (%s)\n",
		   fns[state->request->data.ndrcmd].name,
		   domain ? domain->name : "no domain"));

	ZERO_STRUCT(p);
	p.mem_ctx = talloc_stackframe();
	p.in_data.data = data_blob_const(state->request->extra_data.data,
					 state->request->extra_len);

	ret = fns[state->request->data.ndrcmd].fn(&p);
	if (!ret) {
		TALLOC_FREE(p.mem_ctx);
		return WINBINDD_ERROR;
	}

	state->response->extra_data.data =
		talloc_move(state->mem_ctx, &p.out_data.rdata.data);
	state->response->length += p.out_data.rdata.length;
	p.out_data.rdata.length = 0;

	TALLOC_FREE(p.mem_ctx);

	if (state->response->extra_data.data == NULL) {
		return WINBINDD_ERROR;
	}
	return WINBINDD_OK;
}