summaryrefslogtreecommitdiff
path: root/fs/smb/server/mgmt/user_session.c
blob: 15f68ee0508946843983b7d773dc6837f12b3bf0 (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
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
 */

#include <linux/list.h>
#include <linux/slab.h>
#include <linux/rwsem.h>
#include <linux/xarray.h>

#include "ksmbd_ida.h"
#include "user_session.h"
#include "user_config.h"
#include "tree_connect.h"
#include "../transport_ipc.h"
#include "../connection.h"
#include "../vfs_cache.h"

static DEFINE_IDA(session_ida);

#define SESSION_HASH_BITS		3
static DEFINE_HASHTABLE(sessions_table, SESSION_HASH_BITS);
static DECLARE_RWSEM(sessions_table_lock);

struct ksmbd_session_rpc {
	int			id;
	unsigned int		method;
};

static void free_channel_list(struct ksmbd_session *sess)
{
	struct channel *chann;
	unsigned long index;

	xa_for_each(&sess->ksmbd_chann_list, index, chann) {
		xa_erase(&sess->ksmbd_chann_list, index);
		kfree(chann);
	}

	xa_destroy(&sess->ksmbd_chann_list);
}

static void __session_rpc_close(struct ksmbd_session *sess,
				struct ksmbd_session_rpc *entry)
{
	struct ksmbd_rpc_command *resp;

	resp = ksmbd_rpc_close(sess, entry->id);
	if (!resp)
		pr_err("Unable to close RPC pipe %d\n", entry->id);

	kvfree(resp);
	ksmbd_rpc_id_free(entry->id);
	kfree(entry);
}

static void ksmbd_session_rpc_clear_list(struct ksmbd_session *sess)
{
	struct ksmbd_session_rpc *entry;
	long index;

	xa_for_each(&sess->rpc_handle_list, index, entry) {
		xa_erase(&sess->rpc_handle_list, index);
		__session_rpc_close(sess, entry);
	}

	xa_destroy(&sess->rpc_handle_list);
}

static int __rpc_method(char *rpc_name)
{
	if (!strcmp(rpc_name, "\\srvsvc") || !strcmp(rpc_name, "srvsvc"))
		return KSMBD_RPC_SRVSVC_METHOD_INVOKE;

	if (!strcmp(rpc_name, "\\wkssvc") || !strcmp(rpc_name, "wkssvc"))
		return KSMBD_RPC_WKSSVC_METHOD_INVOKE;

	if (!strcmp(rpc_name, "LANMAN") || !strcmp(rpc_name, "lanman"))
		return KSMBD_RPC_RAP_METHOD;

	if (!strcmp(rpc_name, "\\samr") || !strcmp(rpc_name, "samr"))
		return KSMBD_RPC_SAMR_METHOD_INVOKE;

	if (!strcmp(rpc_name, "\\lsarpc") || !strcmp(rpc_name, "lsarpc"))
		return KSMBD_RPC_LSARPC_METHOD_INVOKE;

	pr_err("Unsupported RPC: %s\n", rpc_name);
	return 0;
}

int ksmbd_session_rpc_open(struct ksmbd_session *sess, char *rpc_name)
{
	struct ksmbd_session_rpc *entry;
	struct ksmbd_rpc_command *resp;
	int method;

	method = __rpc_method(rpc_name);
	if (!method)
		return -EINVAL;

	entry = kzalloc(sizeof(struct ksmbd_session_rpc), GFP_KERNEL);
	if (!entry)
		return -ENOMEM;

	entry->method = method;
	entry->id = ksmbd_ipc_id_alloc();
	if (entry->id < 0)
		goto free_entry;
	xa_store(&sess->rpc_handle_list, entry->id, entry, GFP_KERNEL);

	resp = ksmbd_rpc_open(sess, entry->id);
	if (!resp)
		goto free_id;

	kvfree(resp);
	return entry->id;
free_id:
	xa_erase(&sess->rpc_handle_list, entry->id);
	ksmbd_rpc_id_free(entry->id);
free_entry:
	kfree(entry);
	return -EINVAL;
}

void ksmbd_session_rpc_close(struct ksmbd_session *sess, int id)
{
	struct ksmbd_session_rpc *entry;

	entry = xa_erase(&sess->rpc_handle_list, id);
	if (entry)
		__session_rpc_close(sess, entry);
}

int ksmbd_session_rpc_method(struct ksmbd_session *sess, int id)
{
	struct ksmbd_session_rpc *entry;

	entry = xa_load(&sess->rpc_handle_list, id);
	return entry ? entry->method : 0;
}

void ksmbd_session_destroy(struct ksmbd_session *sess)
{
	if (!sess)
		return;

	if (sess->user)
		ksmbd_free_user(sess->user);

	ksmbd_tree_conn_session_logoff(sess);
	ksmbd_destroy_file_table(&sess->file_table);
	ksmbd_session_rpc_clear_list(sess);
	free_channel_list(sess);
	kfree(sess->Preauth_HashValue);
	ksmbd_release_id(&session_ida, sess->id);
	kfree(sess);
}

static struct ksmbd_session *__session_lookup(unsigned long long id)
{
	struct ksmbd_session *sess;

	hash_for_each_possible(sessions_table, sess, hlist, id) {
		if (id == sess->id) {
			sess->last_active = jiffies;
			return sess;
		}
	}
	return NULL;
}

static void ksmbd_expire_session(struct ksmbd_conn *conn)
{
	unsigned long id;
	struct ksmbd_session *sess;

	down_write(&conn->session_lock);
	xa_for_each(&conn->sessions, id, sess) {
		if (sess->state != SMB2_SESSION_VALID ||
		    time_after(jiffies,
			       sess->last_active + SMB2_SESSION_TIMEOUT)) {
			xa_erase(&conn->sessions, sess->id);
			hash_del(&sess->hlist);
			ksmbd_session_destroy(sess);
			continue;
		}
	}
	up_write(&conn->session_lock);
}

int ksmbd_session_register(struct ksmbd_conn *conn,
			   struct ksmbd_session *sess)
{
	sess->dialect = conn->dialect;
	memcpy(sess->ClientGUID, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE);
	ksmbd_expire_session(conn);
	return xa_err(xa_store(&conn->sessions, sess->id, sess, GFP_KERNEL));
}

static int ksmbd_chann_del(struct ksmbd_conn *conn, struct ksmbd_session *sess)
{
	struct channel *chann;

	chann = xa_erase(&sess->ksmbd_chann_list, (long)conn);
	if (!chann)
		return -ENOENT;

	kfree(chann);
	return 0;
}

void ksmbd_sessions_deregister(struct ksmbd_conn *conn)
{
	struct ksmbd_session *sess;
	unsigned long id;

	down_write(&sessions_table_lock);
	if (conn->binding) {
		int bkt;
		struct hlist_node *tmp;

		hash_for_each_safe(sessions_table, bkt, tmp, sess, hlist) {
			if (!ksmbd_chann_del(conn, sess) &&
			    xa_empty(&sess->ksmbd_chann_list)) {
				hash_del(&sess->hlist);
				ksmbd_session_destroy(sess);
			}
		}
	}
	up_write(&sessions_table_lock);

	down_write(&conn->session_lock);
	xa_for_each(&conn->sessions, id, sess) {
		unsigned long chann_id;
		struct channel *chann;

		xa_for_each(&sess->ksmbd_chann_list, chann_id, chann) {
			if (chann->conn != conn)
				ksmbd_conn_set_exiting(chann->conn);
		}

		ksmbd_chann_del(conn, sess);
		if (xa_empty(&sess->ksmbd_chann_list)) {
			xa_erase(&conn->sessions, sess->id);
			hash_del(&sess->hlist);
			ksmbd_session_destroy(sess);
		}
	}
	up_write(&conn->session_lock);
}

struct ksmbd_session *ksmbd_session_lookup(struct ksmbd_conn *conn,
					   unsigned long long id)
{
	struct ksmbd_session *sess;

	down_read(&conn->session_lock);
	sess = xa_load(&conn->sessions, id);
	if (sess)
		sess->last_active = jiffies;
	up_read(&conn->session_lock);
	return sess;
}

struct ksmbd_session *ksmbd_session_lookup_slowpath(unsigned long long id)
{
	struct ksmbd_session *sess;

	down_read(&sessions_table_lock);
	sess = __session_lookup(id);
	if (sess)
		sess->last_active = jiffies;
	up_read(&sessions_table_lock);

	return sess;
}

struct ksmbd_session *ksmbd_session_lookup_all(struct ksmbd_conn *conn,
					       unsigned long long id)
{
	struct ksmbd_session *sess;

	sess = ksmbd_session_lookup(conn, id);
	if (!sess && conn->binding)
		sess = ksmbd_session_lookup_slowpath(id);
	if (sess && sess->state != SMB2_SESSION_VALID)
		sess = NULL;
	return sess;
}

struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn,
						    u64 sess_id)
{
	struct preauth_session *sess;

	sess = kmalloc(sizeof(struct preauth_session), GFP_KERNEL);
	if (!sess)
		return NULL;

	sess->id = sess_id;
	memcpy(sess->Preauth_HashValue, conn->preauth_info->Preauth_HashValue,
	       PREAUTH_HASHVALUE_SIZE);
	list_add(&sess->preauth_entry, &conn->preauth_sess_table);

	return sess;
}

static bool ksmbd_preauth_session_id_match(struct preauth_session *sess,
					   unsigned long long id)
{
	return sess->id == id;
}

struct preauth_session *ksmbd_preauth_session_lookup(struct ksmbd_conn *conn,
						     unsigned long long id)
{
	struct preauth_session *sess = NULL;

	list_for_each_entry(sess, &conn->preauth_sess_table, preauth_entry) {
		if (ksmbd_preauth_session_id_match(sess, id))
			return sess;
	}
	return NULL;
}

static int __init_smb2_session(struct ksmbd_session *sess)
{
	int id = ksmbd_acquire_smb2_uid(&session_ida);

	if (id < 0)
		return -EINVAL;
	sess->id = id;
	return 0;
}

static struct ksmbd_session *__session_create(int protocol)
{
	struct ksmbd_session *sess;
	int ret;

	if (protocol != CIFDS_SESSION_FLAG_SMB2)
		return NULL;

	sess = kzalloc(sizeof(struct ksmbd_session), GFP_KERNEL);
	if (!sess)
		return NULL;

	if (ksmbd_init_file_table(&sess->file_table))
		goto error;

	sess->last_active = jiffies;
	sess->state = SMB2_SESSION_IN_PROGRESS;
	set_session_flag(sess, protocol);
	xa_init(&sess->tree_conns);
	xa_init(&sess->ksmbd_chann_list);
	xa_init(&sess->rpc_handle_list);
	sess->sequence_number = 1;
	rwlock_init(&sess->tree_conns_lock);

	ret = __init_smb2_session(sess);
	if (ret)
		goto error;

	ida_init(&sess->tree_conn_ida);

	down_write(&sessions_table_lock);
	hash_add(sessions_table, &sess->hlist, sess->id);
	up_write(&sessions_table_lock);

	return sess;

error:
	ksmbd_session_destroy(sess);
	return NULL;
}

struct ksmbd_session *ksmbd_smb2_session_create(void)
{
	return __session_create(CIFDS_SESSION_FLAG_SMB2);
}

int ksmbd_acquire_tree_conn_id(struct ksmbd_session *sess)
{
	int id = -EINVAL;

	if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2))
		id = ksmbd_acquire_smb2_tid(&sess->tree_conn_ida);

	return id;
}

void ksmbd_release_tree_conn_id(struct ksmbd_session *sess, int id)
{
	if (id >= 0)
		ksmbd_release_id(&sess->tree_conn_ida, id);
}