1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2018 Samsung Electronics Co., Ltd.
4 */
5
6 #include <linux/list.h>
7 #include <linux/slab.h>
8 #include <linux/rwsem.h>
9 #include <linux/xarray.h>
10
11 #include "ksmbd_ida.h"
12 #include "user_session.h"
13 #include "user_config.h"
14 #include "tree_connect.h"
15 #include "../transport_ipc.h"
16 #include "../connection.h"
17 #include "../vfs_cache.h"
18
19 static DEFINE_IDA(session_ida);
20
21 #define SESSION_HASH_BITS 3
22 static DEFINE_HASHTABLE(sessions_table, SESSION_HASH_BITS);
23 static DECLARE_RWSEM(sessions_table_lock);
24
25 struct ksmbd_session_rpc {
26 int id;
27 unsigned int method;
28 };
29
30 static void free_channel_list(struct ksmbd_session *sess)
31 {
32 struct channel *chann;
33 unsigned long index;
34
35 xa_for_each(&sess->ksmbd_chann_list, index, chann) {
36 xa_erase(&sess->ksmbd_chann_list, index);
37 kfree(chann);
38 }
39
40 xa_destroy(&sess->ksmbd_chann_list);
41 }
42
43 static void __session_rpc_close(struct ksmbd_session *sess,
44 struct ksmbd_session_rpc *entry)
45 {
46 struct ksmbd_rpc_command *resp;
47
48 resp = ksmbd_rpc_close(sess, entry->id);
49 if (!resp)
50 pr_err("Unable to close RPC pipe %d\n", entry->id);
51
52 kvfree(resp);
53 ksmbd_rpc_id_free(entry->id);
54 kfree(entry);
55 }
56
57 static void ksmbd_session_rpc_clear_list(struct ksmbd_session *sess)
58 {
59 struct ksmbd_session_rpc *entry;
60 long index;
61
62 xa_for_each(&sess->rpc_handle_list, index, entry) {
63 xa_erase(&sess->rpc_handle_list, index);
64 __session_rpc_close(sess, entry);
65 }
66
67 xa_destroy(&sess->rpc_handle_list);
68 }
69
70 static int __rpc_method(char *rpc_name)
71 {
72 if (!strcmp(rpc_name, "\\srvsvc") || !strcmp(rpc_name, "srvsvc"))
73 return KSMBD_RPC_SRVSVC_METHOD_INVOKE;
74
75 if (!strcmp(rpc_name, "\\wkssvc") || !strcmp(rpc_name, "wkssvc"))
76 return KSMBD_RPC_WKSSVC_METHOD_INVOKE;
77
78 if (!strcmp(rpc_name, "LANMAN") || !strcmp(rpc_name, "lanman"))
79 return KSMBD_RPC_RAP_METHOD;
80
81 if (!strcmp(rpc_name, "\\samr") || !strcmp(rpc_name, "samr"))
82 return KSMBD_RPC_SAMR_METHOD_INVOKE;
83
84 if (!strcmp(rpc_name, "\\lsarpc") || !strcmp(rpc_name, "lsarpc"))
85 return KSMBD_RPC_LSARPC_METHOD_INVOKE;
86
87 pr_err("Unsupported RPC: %s\n", rpc_name);
88 return 0;
89 }
90
91 int ksmbd_session_rpc_open(struct ksmbd_session *sess, char *rpc_name)
92 {
93 struct ksmbd_session_rpc *entry;
94 struct ksmbd_rpc_command *resp;
95 int method;
96
97 method = __rpc_method(rpc_name);
98 if (!method)
99 return -EINVAL;
100
101 entry = kzalloc(sizeof(struct ksmbd_session_rpc), GFP_KERNEL);
102 if (!entry)
103 return -ENOMEM;
104
105 entry->method = method;
106 entry->id = ksmbd_ipc_id_alloc();
107 if (entry->id < 0)
108 goto free_entry;
109 xa_store(&sess->rpc_handle_list, entry->id, entry, GFP_KERNEL);
110
111 resp = ksmbd_rpc_open(sess, entry->id);
112 if (!resp)
113 goto free_id;
114
115 kvfree(resp);
116 return entry->id;
117 free_id:
118 xa_erase(&sess->rpc_handle_list, entry->id);
119 ksmbd_rpc_id_free(entry->id);
120 free_entry:
121 kfree(entry);
122 return -EINVAL;
123 }
124
125 void ksmbd_session_rpc_close(struct ksmbd_session *sess, int id)
126 {
127 struct ksmbd_session_rpc *entry;
128
129 entry = xa_erase(&sess->rpc_handle_list, id);
130 if (entry)
131 __session_rpc_close(sess, entry);
132 }
133
134 int ksmbd_session_rpc_method(struct ksmbd_session *sess, int id)
135 {
136 struct ksmbd_session_rpc *entry;
137
138 entry = xa_load(&sess->rpc_handle_list, id);
139 return entry ? entry->method : 0;
140 }
141
142 void ksmbd_session_destroy(struct ksmbd_session *sess)
143 {
144 if (!sess)
145 return;
146
147 if (sess->user)
148 ksmbd_free_user(sess->user);
149
150 ksmbd_tree_conn_session_logoff(sess);
151 ksmbd_destroy_file_table(&sess->file_table);
152 ksmbd_launch_ksmbd_durable_scavenger();
153 ksmbd_session_rpc_clear_list(sess);
154 free_channel_list(sess);
155 kfree(sess->Preauth_HashValue);
156 ksmbd_release_id(&session_ida, sess->id);
157 kfree(sess);
158 }
159
160 struct ksmbd_session *__session_lookup(unsigned long long id)
161 {
162 struct ksmbd_session *sess;
163
164 hash_for_each_possible(sessions_table, sess, hlist, id) {
165 if (id == sess->id) {
166 sess->last_active = jiffies;
167 return sess;
168 }
169 }
170 return NULL;
171 }
172
173 static void ksmbd_expire_session(struct ksmbd_conn *conn)
174 {
175 unsigned long id;
176 struct ksmbd_session *sess;
177
178 down_write(&conn->session_lock);
179 xa_for_each(&conn->sessions, id, sess) {
180 if (atomic_read(&sess->refcnt) == 0 &&
181 (sess->state != SMB2_SESSION_VALID ||
182 time_after(jiffies,
183 sess->last_active + SMB2_SESSION_TIMEOUT))) {
184 xa_erase(&conn->sessions, sess->id);
185 hash_del(&sess->hlist);
186 ksmbd_session_destroy(sess);
187 continue;
188 }
189 }
190 up_write(&conn->session_lock);
191 }
192
193 int ksmbd_session_register(struct ksmbd_conn *conn,
194 struct ksmbd_session *sess)
195 {
196 sess->dialect = conn->dialect;
197 memcpy(sess->ClientGUID, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE);
198 ksmbd_expire_session(conn);
199 return xa_err(xa_store(&conn->sessions, sess->id, sess, GFP_KERNEL));
200 }
201
202 static int ksmbd_chann_del(struct ksmbd_conn *conn, struct ksmbd_session *sess)
203 {
204 struct channel *chann;
205
206 chann = xa_erase(&sess->ksmbd_chann_list, (long)conn);
207 if (!chann)
208 return -ENOENT;
209
210 kfree(chann);
211 return 0;
212 }
213
214 void ksmbd_sessions_deregister(struct ksmbd_conn *conn)
215 {
216 struct ksmbd_session *sess;
217 unsigned long id;
218
219 down_write(&sessions_table_lock);
220 if (conn->binding) {
221 int bkt;
222 struct hlist_node *tmp;
223
224 hash_for_each_safe(sessions_table, bkt, tmp, sess, hlist) {
225 if (!ksmbd_chann_del(conn, sess) &&
226 xa_empty(&sess->ksmbd_chann_list)) {
227 hash_del(&sess->hlist);
228 ksmbd_session_destroy(sess);
229 }
230 }
231 }
232 up_write(&sessions_table_lock);
233
234 down_write(&conn->session_lock);
235 xa_for_each(&conn->sessions, id, sess) {
236 unsigned long chann_id;
237 struct channel *chann;
238
239 xa_for_each(&sess->ksmbd_chann_list, chann_id, chann) {
240 if (chann->conn != conn)
241 ksmbd_conn_set_exiting(chann->conn);
242 }
243
244 ksmbd_chann_del(conn, sess);
245 if (xa_empty(&sess->ksmbd_chann_list)) {
246 xa_erase(&conn->sessions, sess->id);
247 hash_del(&sess->hlist);
248 ksmbd_session_destroy(sess);
249 }
250 }
251 up_write(&conn->session_lock);
252 }
253
254 struct ksmbd_session *ksmbd_session_lookup(struct ksmbd_conn *conn,
255 unsigned long long id)
256 {
257 struct ksmbd_session *sess;
258
259 down_read(&conn->session_lock);
260 sess = xa_load(&conn->sessions, id);
261 if (sess)
262 sess->last_active = jiffies;
263 up_read(&conn->session_lock);
264 return sess;
265 }
266
267 struct ksmbd_session *ksmbd_session_lookup_slowpath(unsigned long long id)
268 {
269 struct ksmbd_session *sess;
270
271 down_read(&sessions_table_lock);
272 sess = __session_lookup(id);
273 up_read(&sessions_table_lock);
274
275 return sess;
276 }
277
278 struct ksmbd_session *ksmbd_session_lookup_all(struct ksmbd_conn *conn,
279 unsigned long long id)
280 {
281 struct ksmbd_session *sess;
282
283 sess = ksmbd_session_lookup(conn, id);
284 if (!sess && conn->binding)
285 sess = ksmbd_session_lookup_slowpath(id);
286 if (sess && sess->state != SMB2_SESSION_VALID)
287 sess = NULL;
288 return sess;
289 }
290
291 void ksmbd_user_session_get(struct ksmbd_session *sess)
292 {
293 atomic_inc(&sess->refcnt);
294 }
295
296 void ksmbd_user_session_put(struct ksmbd_session *sess)
297 {
298 if (!sess)
299 return;
300
301 if (atomic_read(&sess->refcnt) <= 0)
302 WARN_ON(1);
303 else
304 atomic_dec(&sess->refcnt);
305 }
306
307 struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn,
308 u64 sess_id)
309 {
310 struct preauth_session *sess;
311
312 sess = kmalloc(sizeof(struct preauth_session), GFP_KERNEL);
313 if (!sess)
314 return NULL;
315
316 sess->id = sess_id;
317 memcpy(sess->Preauth_HashValue, conn->preauth_info->Preauth_HashValue,
318 PREAUTH_HASHVALUE_SIZE);
319 list_add(&sess->preauth_entry, &conn->preauth_sess_table);
320
321 return sess;
322 }
323
324 void destroy_previous_session(struct ksmbd_conn *conn,
325 struct ksmbd_user *user, u64 id)
326 {
327 struct ksmbd_session *prev_sess;
328 struct ksmbd_user *prev_user;
329 int err;
330
331 down_write(&sessions_table_lock);
332 down_write(&conn->session_lock);
333 prev_sess = __session_lookup(id);
334 if (!prev_sess || prev_sess->state == SMB2_SESSION_EXPIRED)
335 goto out;
336
337 prev_user = prev_sess->user;
338 if (!prev_user ||
339 strcmp(user->name, prev_user->name) ||
340 user->passkey_sz != prev_user->passkey_sz ||
341 memcmp(user->passkey, prev_user->passkey, user->passkey_sz))
342 goto out;
343
344 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_RECONNECT);
345 err = ksmbd_conn_wait_idle_sess_id(conn, id);
346 if (err) {
347 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_NEGOTIATE);
348 goto out;
349 }
350
351 ksmbd_destroy_file_table(&prev_sess->file_table);
352 prev_sess->state = SMB2_SESSION_EXPIRED;
353 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_NEGOTIATE);
354 ksmbd_launch_ksmbd_durable_scavenger();
355 out:
356 up_write(&conn->session_lock);
357 up_write(&sessions_table_lock);
358 }
359
360 static bool ksmbd_preauth_session_id_match(struct preauth_session *sess,
361 unsigned long long id)
362 {
363 return sess->id == id;
364 }
365
366 struct preauth_session *ksmbd_preauth_session_lookup(struct ksmbd_conn *conn,
367 unsigned long long id)
368 {
369 struct preauth_session *sess = NULL;
370
371 list_for_each_entry(sess, &conn->preauth_sess_table, preauth_entry) {
372 if (ksmbd_preauth_session_id_match(sess, id))
373 return sess;
374 }
375 return NULL;
376 }
377
378 static int __init_smb2_session(struct ksmbd_session *sess)
379 {
380 int id = ksmbd_acquire_smb2_uid(&session_ida);
381
382 if (id < 0)
383 return -EINVAL;
384 sess->id = id;
385 return 0;
386 }
387
388 static struct ksmbd_session *__session_create(int protocol)
389 {
390 struct ksmbd_session *sess;
391 int ret;
392
393 if (protocol != CIFDS_SESSION_FLAG_SMB2)
394 return NULL;
395
396 sess = kzalloc(sizeof(struct ksmbd_session), GFP_KERNEL);
397 if (!sess)
398 return NULL;
399
400 if (ksmbd_init_file_table(&sess->file_table))
401 goto error;
402
403 sess->last_active = jiffies;
404 sess->state = SMB2_SESSION_IN_PROGRESS;
405 set_session_flag(sess, protocol);
406 xa_init(&sess->tree_conns);
407 xa_init(&sess->ksmbd_chann_list);
408 xa_init(&sess->rpc_handle_list);
409 sess->sequence_number = 1;
410 rwlock_init(&sess->tree_conns_lock);
411 atomic_set(&sess->refcnt, 1);
412
413 ret = __init_smb2_session(sess);
414 if (ret)
415 goto error;
416
417 ida_init(&sess->tree_conn_ida);
418
419 down_write(&sessions_table_lock);
420 hash_add(sessions_table, &sess->hlist, sess->id);
421 up_write(&sessions_table_lock);
422
423 return sess;
424
425 error:
426 ksmbd_session_destroy(sess);
427 return NULL;
428 }
429
430 struct ksmbd_session *ksmbd_smb2_session_create(void)
431 {
432 return __session_create(CIFDS_SESSION_FLAG_SMB2);
433 }
434
435 int ksmbd_acquire_tree_conn_id(struct ksmbd_session *sess)
436 {
437 int id = -EINVAL;
438
439 if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2))
440 id = ksmbd_acquire_smb2_tid(&sess->tree_conn_ida);
441
442 return id;
443 }
444
445 void ksmbd_release_tree_conn_id(struct ksmbd_session *sess, int id)
446 {
447 if (id >= 0)
448 ksmbd_release_id(&sess->tree_conn_ida, id);
449 }
450
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