1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
4 * Copyright (C) 2018 Samsung Electronics Co., Ltd.
5 */
6
7 #include "glob.h"
8 #include "oplock.h"
9 #include "misc.h"
10 #include <linux/sched/signal.h>
11 #include <linux/workqueue.h>
12 #include <linux/sysfs.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15
16 #include "server.h"
17 #include "smb_common.h"
18 #include "../common/smb2status.h"
19 #include "connection.h"
20 #include "transport_ipc.h"
21 #include "mgmt/user_session.h"
22 #include "crypto_ctx.h"
23 #include "auth.h"
24
25 int ksmbd_debug_types;
26
27 struct ksmbd_server_config server_conf;
28
29 enum SERVER_CTRL_TYPE {
30 SERVER_CTRL_TYPE_INIT,
31 SERVER_CTRL_TYPE_RESET,
32 };
33
34 struct server_ctrl_struct {
35 int type;
36 struct work_struct ctrl_work;
37 };
38
39 static DEFINE_MUTEX(ctrl_lock);
40
___server_conf_set(int idx,char * val)41 static int ___server_conf_set(int idx, char *val)
42 {
43 if (idx >= ARRAY_SIZE(server_conf.conf))
44 return -EINVAL;
45
46 if (!val || val[0] == 0x00)
47 return -EINVAL;
48
49 kfree(server_conf.conf[idx]);
50 server_conf.conf[idx] = kstrdup(val, GFP_KERNEL);
51 if (!server_conf.conf[idx])
52 return -ENOMEM;
53 return 0;
54 }
55
ksmbd_set_netbios_name(char * v)56 int ksmbd_set_netbios_name(char *v)
57 {
58 return ___server_conf_set(SERVER_CONF_NETBIOS_NAME, v);
59 }
60
ksmbd_set_server_string(char * v)61 int ksmbd_set_server_string(char *v)
62 {
63 return ___server_conf_set(SERVER_CONF_SERVER_STRING, v);
64 }
65
ksmbd_set_work_group(char * v)66 int ksmbd_set_work_group(char *v)
67 {
68 return ___server_conf_set(SERVER_CONF_WORK_GROUP, v);
69 }
70
ksmbd_netbios_name(void)71 char *ksmbd_netbios_name(void)
72 {
73 return server_conf.conf[SERVER_CONF_NETBIOS_NAME];
74 }
75
ksmbd_server_string(void)76 char *ksmbd_server_string(void)
77 {
78 return server_conf.conf[SERVER_CONF_SERVER_STRING];
79 }
80
ksmbd_work_group(void)81 char *ksmbd_work_group(void)
82 {
83 return server_conf.conf[SERVER_CONF_WORK_GROUP];
84 }
85
86 /**
87 * check_conn_state() - check state of server thread connection
88 * @work: smb work containing server thread information
89 *
90 * Return: 0 on valid connection, otherwise 1 to reconnect
91 */
check_conn_state(struct ksmbd_work * work)92 static inline int check_conn_state(struct ksmbd_work *work)
93 {
94 struct smb_hdr *rsp_hdr;
95
96 if (ksmbd_conn_exiting(work->conn) ||
97 ksmbd_conn_need_reconnect(work->conn)) {
98 rsp_hdr = work->response_buf;
99 rsp_hdr->Status.CifsError = STATUS_CONNECTION_DISCONNECTED;
100 return 1;
101 }
102 return 0;
103 }
104
105 #define SERVER_HANDLER_CONTINUE 0
106 #define SERVER_HANDLER_ABORT 1
107
__process_request(struct ksmbd_work * work,struct ksmbd_conn * conn,u16 * cmd)108 static int __process_request(struct ksmbd_work *work, struct ksmbd_conn *conn,
109 u16 *cmd)
110 {
111 struct smb_version_cmds *cmds;
112 u16 command;
113 int ret;
114
115 if (check_conn_state(work))
116 return SERVER_HANDLER_CONTINUE;
117
118 if (ksmbd_verify_smb_message(work)) {
119 conn->ops->set_rsp_status(work, STATUS_INVALID_PARAMETER);
120 return SERVER_HANDLER_ABORT;
121 }
122
123 command = conn->ops->get_cmd_val(work);
124 *cmd = command;
125
126 andx_again:
127 if (command >= conn->max_cmds) {
128 conn->ops->set_rsp_status(work, STATUS_INVALID_PARAMETER);
129 return SERVER_HANDLER_CONTINUE;
130 }
131
132 cmds = &conn->cmds[command];
133 if (!cmds->proc) {
134 ksmbd_debug(SMB, "*** not implemented yet cmd = %x\n", command);
135 conn->ops->set_rsp_status(work, STATUS_NOT_IMPLEMENTED);
136 return SERVER_HANDLER_CONTINUE;
137 }
138
139 if (work->sess && conn->ops->is_sign_req(work, command)) {
140 ret = conn->ops->check_sign_req(work);
141 if (!ret) {
142 conn->ops->set_rsp_status(work, STATUS_ACCESS_DENIED);
143 return SERVER_HANDLER_CONTINUE;
144 }
145 }
146
147 ret = cmds->proc(work);
148
149 if (ret < 0)
150 ksmbd_debug(CONN, "Failed to process %u [%d]\n", command, ret);
151 /* AndX commands - chained request can return positive values */
152 else if (ret > 0) {
153 command = ret;
154 *cmd = command;
155 goto andx_again;
156 }
157
158 if (work->send_no_response)
159 return SERVER_HANDLER_ABORT;
160 return SERVER_HANDLER_CONTINUE;
161 }
162
__handle_ksmbd_work(struct ksmbd_work * work,struct ksmbd_conn * conn)163 static void __handle_ksmbd_work(struct ksmbd_work *work,
164 struct ksmbd_conn *conn)
165 {
166 u16 command = 0;
167 int rc;
168 bool is_chained = false;
169
170 if (conn->ops->is_transform_hdr &&
171 conn->ops->is_transform_hdr(work->request_buf)) {
172 rc = conn->ops->decrypt_req(work);
173 if (rc < 0)
174 return;
175 work->encrypted = true;
176 }
177
178 if (conn->ops->allocate_rsp_buf(work))
179 return;
180
181 rc = conn->ops->init_rsp_hdr(work);
182 if (rc) {
183 /* either uid or tid is not correct */
184 conn->ops->set_rsp_status(work, STATUS_INVALID_HANDLE);
185 goto send;
186 }
187
188 do {
189 if (conn->ops->check_user_session) {
190 rc = conn->ops->check_user_session(work);
191 if (rc < 0) {
192 if (rc == -EINVAL)
193 conn->ops->set_rsp_status(work,
194 STATUS_INVALID_PARAMETER);
195 else
196 conn->ops->set_rsp_status(work,
197 STATUS_USER_SESSION_DELETED);
198 goto send;
199 } else if (rc > 0) {
200 rc = conn->ops->get_ksmbd_tcon(work);
201 if (rc < 0) {
202 if (rc == -EINVAL)
203 conn->ops->set_rsp_status(work,
204 STATUS_INVALID_PARAMETER);
205 else
206 conn->ops->set_rsp_status(work,
207 STATUS_NETWORK_NAME_DELETED);
208 goto send;
209 }
210 }
211 }
212
213 rc = __process_request(work, conn, &command);
214 if (rc == SERVER_HANDLER_ABORT)
215 break;
216
217 /*
218 * Call smb2_set_rsp_credits() function to set number of credits
219 * granted in hdr of smb2 response.
220 */
221 if (conn->ops->set_rsp_credits) {
222 spin_lock(&conn->credits_lock);
223 rc = conn->ops->set_rsp_credits(work);
224 spin_unlock(&conn->credits_lock);
225 if (rc < 0) {
226 conn->ops->set_rsp_status(work,
227 STATUS_INVALID_PARAMETER);
228 goto send;
229 }
230 }
231
232 is_chained = is_chained_smb2_message(work);
233
234 if (work->sess &&
235 (work->sess->sign || smb3_11_final_sess_setup_resp(work) ||
236 conn->ops->is_sign_req(work, command)))
237 conn->ops->set_sign_rsp(work);
238 } while (is_chained == true);
239
240 send:
241 if (work->tcon)
242 ksmbd_tree_connect_put(work->tcon);
243 smb3_preauth_hash_rsp(work);
244 if (work->sess && work->sess->enc && work->encrypted &&
245 conn->ops->encrypt_resp) {
246 rc = conn->ops->encrypt_resp(work);
247 if (rc < 0)
248 conn->ops->set_rsp_status(work, STATUS_DATA_ERROR);
249 }
250
251 ksmbd_conn_write(work);
252 }
253
254 /**
255 * handle_ksmbd_work() - process pending smb work requests
256 * @wk: smb work containing request command buffer
257 *
258 * called by kworker threads to processing remaining smb work requests
259 */
handle_ksmbd_work(struct work_struct * wk)260 static void handle_ksmbd_work(struct work_struct *wk)
261 {
262 struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
263 struct ksmbd_conn *conn = work->conn;
264
265 atomic64_inc(&conn->stats.request_served);
266
267 __handle_ksmbd_work(work, conn);
268
269 ksmbd_conn_try_dequeue_request(work);
270 ksmbd_free_work_struct(work);
271 /*
272 * Checking waitqueue to dropping pending requests on
273 * disconnection. waitqueue_active is safe because it
274 * uses atomic operation for condition.
275 */
276 if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q))
277 wake_up(&conn->r_count_q);
278 }
279
280 /**
281 * queue_ksmbd_work() - queue a smb request to worker thread queue
282 * for processing smb command and sending response
283 * @conn: connection instance
284 *
285 * read remaining data from socket create and submit work.
286 */
queue_ksmbd_work(struct ksmbd_conn * conn)287 static int queue_ksmbd_work(struct ksmbd_conn *conn)
288 {
289 struct ksmbd_work *work;
290 int err;
291
292 work = ksmbd_alloc_work_struct();
293 if (!work) {
294 pr_err("allocation for work failed\n");
295 return -ENOMEM;
296 }
297
298 work->conn = conn;
299 work->request_buf = conn->request_buf;
300 conn->request_buf = NULL;
301
302 err = ksmbd_init_smb_server(work);
303 if (err) {
304 ksmbd_free_work_struct(work);
305 return 0;
306 }
307
308 ksmbd_conn_enqueue_request(work);
309 atomic_inc(&conn->r_count);
310 /* update activity on connection */
311 conn->last_active = jiffies;
312 INIT_WORK(&work->work, handle_ksmbd_work);
313 ksmbd_queue_work(work);
314 return 0;
315 }
316
ksmbd_server_process_request(struct ksmbd_conn * conn)317 static int ksmbd_server_process_request(struct ksmbd_conn *conn)
318 {
319 return queue_ksmbd_work(conn);
320 }
321
ksmbd_server_terminate_conn(struct ksmbd_conn * conn)322 static int ksmbd_server_terminate_conn(struct ksmbd_conn *conn)
323 {
324 ksmbd_sessions_deregister(conn);
325 destroy_lease_table(conn);
326 return 0;
327 }
328
ksmbd_server_tcp_callbacks_init(void)329 static void ksmbd_server_tcp_callbacks_init(void)
330 {
331 struct ksmbd_conn_ops ops;
332
333 ops.process_fn = ksmbd_server_process_request;
334 ops.terminate_fn = ksmbd_server_terminate_conn;
335
336 ksmbd_conn_init_server_callbacks(&ops);
337 }
338
server_conf_free(void)339 static void server_conf_free(void)
340 {
341 int i;
342
343 for (i = 0; i < ARRAY_SIZE(server_conf.conf); i++) {
344 kfree(server_conf.conf[i]);
345 server_conf.conf[i] = NULL;
346 }
347 }
348
server_conf_init(void)349 static int server_conf_init(void)
350 {
351 WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP);
352 server_conf.enforced_signing = 0;
353 server_conf.min_protocol = ksmbd_min_protocol();
354 server_conf.max_protocol = ksmbd_max_protocol();
355 server_conf.auth_mechs = KSMBD_AUTH_NTLMSSP;
356 #ifdef CONFIG_SMB_SERVER_KERBEROS5
357 server_conf.auth_mechs |= KSMBD_AUTH_KRB5 |
358 KSMBD_AUTH_MSKRB5;
359 #endif
360 return 0;
361 }
362
server_ctrl_handle_init(struct server_ctrl_struct * ctrl)363 static void server_ctrl_handle_init(struct server_ctrl_struct *ctrl)
364 {
365 int ret;
366
367 ret = ksmbd_conn_transport_init();
368 if (ret) {
369 server_queue_ctrl_reset_work();
370 return;
371 }
372
373 WRITE_ONCE(server_conf.state, SERVER_STATE_RUNNING);
374 }
375
server_ctrl_handle_reset(struct server_ctrl_struct * ctrl)376 static void server_ctrl_handle_reset(struct server_ctrl_struct *ctrl)
377 {
378 ksmbd_ipc_soft_reset();
379 ksmbd_conn_transport_destroy();
380 ksmbd_stop_durable_scavenger();
381 server_conf_free();
382 server_conf_init();
383 WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP);
384 }
385
server_ctrl_handle_work(struct work_struct * work)386 static void server_ctrl_handle_work(struct work_struct *work)
387 {
388 struct server_ctrl_struct *ctrl;
389
390 ctrl = container_of(work, struct server_ctrl_struct, ctrl_work);
391
392 mutex_lock(&ctrl_lock);
393 switch (ctrl->type) {
394 case SERVER_CTRL_TYPE_INIT:
395 server_ctrl_handle_init(ctrl);
396 break;
397 case SERVER_CTRL_TYPE_RESET:
398 server_ctrl_handle_reset(ctrl);
399 break;
400 default:
401 pr_err("Unknown server work type: %d\n", ctrl->type);
402 }
403 mutex_unlock(&ctrl_lock);
404 kfree(ctrl);
405 module_put(THIS_MODULE);
406 }
407
__queue_ctrl_work(int type)408 static int __queue_ctrl_work(int type)
409 {
410 struct server_ctrl_struct *ctrl;
411
412 ctrl = kmalloc(sizeof(struct server_ctrl_struct), GFP_KERNEL);
413 if (!ctrl)
414 return -ENOMEM;
415
416 __module_get(THIS_MODULE);
417 ctrl->type = type;
418 INIT_WORK(&ctrl->ctrl_work, server_ctrl_handle_work);
419 queue_work(system_long_wq, &ctrl->ctrl_work);
420 return 0;
421 }
422
server_queue_ctrl_init_work(void)423 int server_queue_ctrl_init_work(void)
424 {
425 return __queue_ctrl_work(SERVER_CTRL_TYPE_INIT);
426 }
427
server_queue_ctrl_reset_work(void)428 int server_queue_ctrl_reset_work(void)
429 {
430 return __queue_ctrl_work(SERVER_CTRL_TYPE_RESET);
431 }
432
stats_show(const struct class * class,const struct class_attribute * attr,char * buf)433 static ssize_t stats_show(const struct class *class, const struct class_attribute *attr,
434 char *buf)
435 {
436 /*
437 * Inc this each time you change stats output format,
438 * so user space will know what to do.
439 */
440 static int stats_version = 2;
441 static const char * const state[] = {
442 "startup",
443 "running",
444 "reset",
445 "shutdown"
446 };
447 return sysfs_emit(buf, "%d %s %d %lu\n", stats_version,
448 state[server_conf.state], server_conf.tcp_port,
449 server_conf.ipc_last_active / HZ);
450 }
451
kill_server_store(const struct class * class,const struct class_attribute * attr,const char * buf,size_t len)452 static ssize_t kill_server_store(const struct class *class,
453 const struct class_attribute *attr, const char *buf,
454 size_t len)
455 {
456 if (!sysfs_streq(buf, "hard"))
457 return len;
458
459 pr_info("kill command received\n");
460 mutex_lock(&ctrl_lock);
461 WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING);
462 __module_get(THIS_MODULE);
463 server_ctrl_handle_reset(NULL);
464 module_put(THIS_MODULE);
465 mutex_unlock(&ctrl_lock);
466 return len;
467 }
468
469 static const char * const debug_type_strings[] = {"smb", "auth", "vfs",
470 "oplock", "ipc", "conn",
471 "rdma"};
472
debug_show(const struct class * class,const struct class_attribute * attr,char * buf)473 static ssize_t debug_show(const struct class *class, const struct class_attribute *attr,
474 char *buf)
475 {
476 ssize_t sz = 0;
477 int i, pos = 0;
478
479 for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) {
480 if ((ksmbd_debug_types >> i) & 1) {
481 pos = sysfs_emit_at(buf, sz, "[%s] ", debug_type_strings[i]);
482 } else {
483 pos = sysfs_emit_at(buf, sz, "%s ", debug_type_strings[i]);
484 }
485 sz += pos;
486 }
487 sz += sysfs_emit_at(buf, sz, "\n");
488 return sz;
489 }
490
debug_store(const struct class * class,const struct class_attribute * attr,const char * buf,size_t len)491 static ssize_t debug_store(const struct class *class, const struct class_attribute *attr,
492 const char *buf, size_t len)
493 {
494 int i;
495
496 for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) {
497 if (sysfs_streq(buf, "all")) {
498 if (ksmbd_debug_types == KSMBD_DEBUG_ALL)
499 ksmbd_debug_types = 0;
500 else
501 ksmbd_debug_types = KSMBD_DEBUG_ALL;
502 break;
503 }
504
505 if (sysfs_streq(buf, debug_type_strings[i])) {
506 if (ksmbd_debug_types & (1 << i))
507 ksmbd_debug_types &= ~(1 << i);
508 else
509 ksmbd_debug_types |= (1 << i);
510 break;
511 }
512 }
513
514 return len;
515 }
516
517 static CLASS_ATTR_RO(stats);
518 static CLASS_ATTR_WO(kill_server);
519 static CLASS_ATTR_RW(debug);
520
521 static struct attribute *ksmbd_control_class_attrs[] = {
522 &class_attr_stats.attr,
523 &class_attr_kill_server.attr,
524 &class_attr_debug.attr,
525 NULL,
526 };
527 ATTRIBUTE_GROUPS(ksmbd_control_class);
528
529 static struct class ksmbd_control_class = {
530 .name = "ksmbd-control",
531 .class_groups = ksmbd_control_class_groups,
532 };
533
ksmbd_server_shutdown(void)534 static int ksmbd_server_shutdown(void)
535 {
536 WRITE_ONCE(server_conf.state, SERVER_STATE_SHUTTING_DOWN);
537
538 class_unregister(&ksmbd_control_class);
539 ksmbd_workqueue_destroy();
540 ksmbd_ipc_release();
541 ksmbd_conn_transport_destroy();
542 ksmbd_crypto_destroy();
543 ksmbd_free_global_file_table();
544 destroy_lease_table(NULL);
545 ksmbd_work_pool_destroy();
546 ksmbd_exit_file_cache();
547 server_conf_free();
548 return 0;
549 }
550
ksmbd_server_init(void)551 static int __init ksmbd_server_init(void)
552 {
553 int ret;
554
555 ret = class_register(&ksmbd_control_class);
556 if (ret) {
557 pr_err("Unable to register ksmbd-control class\n");
558 return ret;
559 }
560
561 ksmbd_server_tcp_callbacks_init();
562
563 ret = server_conf_init();
564 if (ret)
565 goto err_unregister;
566
567 ret = ksmbd_work_pool_init();
568 if (ret)
569 goto err_unregister;
570
571 ret = ksmbd_init_file_cache();
572 if (ret)
573 goto err_destroy_work_pools;
574
575 ret = ksmbd_ipc_init();
576 if (ret)
577 goto err_exit_file_cache;
578
579 ret = ksmbd_init_global_file_table();
580 if (ret)
581 goto err_ipc_release;
582
583 ret = ksmbd_inode_hash_init();
584 if (ret)
585 goto err_destroy_file_table;
586
587 ret = ksmbd_crypto_create();
588 if (ret)
589 goto err_release_inode_hash;
590
591 ret = ksmbd_workqueue_init();
592 if (ret)
593 goto err_crypto_destroy;
594
595 return 0;
596
597 err_crypto_destroy:
598 ksmbd_crypto_destroy();
599 err_release_inode_hash:
600 ksmbd_release_inode_hash();
601 err_destroy_file_table:
602 ksmbd_free_global_file_table();
603 err_ipc_release:
604 ksmbd_ipc_release();
605 err_exit_file_cache:
606 ksmbd_exit_file_cache();
607 err_destroy_work_pools:
608 ksmbd_work_pool_destroy();
609 err_unregister:
610 class_unregister(&ksmbd_control_class);
611
612 return ret;
613 }
614
615 /**
616 * ksmbd_server_exit() - shutdown forker thread and free memory at module exit
617 */
ksmbd_server_exit(void)618 static void __exit ksmbd_server_exit(void)
619 {
620 ksmbd_server_shutdown();
621 rcu_barrier();
622 ksmbd_release_inode_hash();
623 }
624
625 MODULE_AUTHOR("Namjae Jeon <linkinjeon@kernel.org>");
626 MODULE_DESCRIPTION("Linux kernel CIFS/SMB SERVER");
627 MODULE_LICENSE("GPL");
628 MODULE_SOFTDEP("pre: ecb");
629 MODULE_SOFTDEP("pre: hmac");
630 MODULE_SOFTDEP("pre: md5");
631 MODULE_SOFTDEP("pre: nls");
632 MODULE_SOFTDEP("pre: aes");
633 MODULE_SOFTDEP("pre: cmac");
634 MODULE_SOFTDEP("pre: sha256");
635 MODULE_SOFTDEP("pre: sha512");
636 MODULE_SOFTDEP("pre: aead2");
637 MODULE_SOFTDEP("pre: ccm");
638 MODULE_SOFTDEP("pre: gcm");
639 MODULE_SOFTDEP("pre: crc32");
640 module_init(ksmbd_server_init)
641 module_exit(ksmbd_server_exit)
642