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 "smbstatus.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 if (work->sess)
251 ksmbd_user_session_put(work->sess);
252
253 ksmbd_conn_write(work);
254 }
255
256 /**
257 * handle_ksmbd_work() - process pending smb work requests
258 * @wk: smb work containing request command buffer
259 *
260 * called by kworker threads to processing remaining smb work requests
261 */
handle_ksmbd_work(struct work_struct * wk)262 static void handle_ksmbd_work(struct work_struct *wk)
263 {
264 struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
265 struct ksmbd_conn *conn = work->conn;
266
267 atomic64_inc(&conn->stats.request_served);
268
269 __handle_ksmbd_work(work, conn);
270
271 ksmbd_conn_try_dequeue_request(work);
272 ksmbd_free_work_struct(work);
273 /*
274 * Checking waitqueue to dropping pending requests on
275 * disconnection. waitqueue_active is safe because it
276 * uses atomic operation for condition.
277 */
278 atomic_inc(&conn->refcnt);
279 if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q))
280 wake_up(&conn->r_count_q);
281
282 if (atomic_dec_and_test(&conn->refcnt))
283 kfree(conn);
284 }
285
286 /**
287 * queue_ksmbd_work() - queue a smb request to worker thread queue
288 * for proccessing smb command and sending response
289 * @conn: connection instance
290 *
291 * read remaining data from socket create and submit work.
292 */
queue_ksmbd_work(struct ksmbd_conn * conn)293 static int queue_ksmbd_work(struct ksmbd_conn *conn)
294 {
295 struct ksmbd_work *work;
296 int err;
297
298 err = ksmbd_init_smb_server(conn);
299 if (err)
300 return 0;
301
302 work = ksmbd_alloc_work_struct();
303 if (!work) {
304 pr_err("allocation for work failed\n");
305 return -ENOMEM;
306 }
307
308 work->conn = conn;
309 work->request_buf = conn->request_buf;
310 conn->request_buf = NULL;
311
312 ksmbd_conn_enqueue_request(work);
313 atomic_inc(&conn->r_count);
314 /* update activity on connection */
315 conn->last_active = jiffies;
316 INIT_WORK(&work->work, handle_ksmbd_work);
317 ksmbd_queue_work(work);
318 return 0;
319 }
320
ksmbd_server_process_request(struct ksmbd_conn * conn)321 static int ksmbd_server_process_request(struct ksmbd_conn *conn)
322 {
323 return queue_ksmbd_work(conn);
324 }
325
ksmbd_server_terminate_conn(struct ksmbd_conn * conn)326 static int ksmbd_server_terminate_conn(struct ksmbd_conn *conn)
327 {
328 ksmbd_sessions_deregister(conn);
329 destroy_lease_table(conn);
330 return 0;
331 }
332
ksmbd_server_tcp_callbacks_init(void)333 static void ksmbd_server_tcp_callbacks_init(void)
334 {
335 struct ksmbd_conn_ops ops;
336
337 ops.process_fn = ksmbd_server_process_request;
338 ops.terminate_fn = ksmbd_server_terminate_conn;
339
340 ksmbd_conn_init_server_callbacks(&ops);
341 }
342
server_conf_free(void)343 static void server_conf_free(void)
344 {
345 int i;
346
347 for (i = 0; i < ARRAY_SIZE(server_conf.conf); i++) {
348 kfree(server_conf.conf[i]);
349 server_conf.conf[i] = NULL;
350 }
351 }
352
server_conf_init(void)353 static int server_conf_init(void)
354 {
355 WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP);
356 server_conf.enforced_signing = 0;
357 server_conf.min_protocol = ksmbd_min_protocol();
358 server_conf.max_protocol = ksmbd_max_protocol();
359 server_conf.auth_mechs = KSMBD_AUTH_NTLMSSP;
360 #ifdef CONFIG_SMB_SERVER_KERBEROS5
361 server_conf.auth_mechs |= KSMBD_AUTH_KRB5 |
362 KSMBD_AUTH_MSKRB5;
363 #endif
364 server_conf.max_inflight_req = SMB2_MAX_CREDITS;
365 return 0;
366 }
367
server_ctrl_handle_init(struct server_ctrl_struct * ctrl)368 static void server_ctrl_handle_init(struct server_ctrl_struct *ctrl)
369 {
370 int ret;
371
372 ret = ksmbd_conn_transport_init();
373 if (ret) {
374 server_queue_ctrl_reset_work();
375 return;
376 }
377
378 WRITE_ONCE(server_conf.state, SERVER_STATE_RUNNING);
379 }
380
server_ctrl_handle_reset(struct server_ctrl_struct * ctrl)381 static void server_ctrl_handle_reset(struct server_ctrl_struct *ctrl)
382 {
383 ksmbd_ipc_soft_reset();
384 ksmbd_conn_transport_destroy();
385 server_conf_free();
386 server_conf_init();
387 WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP);
388 }
389
server_ctrl_handle_work(struct work_struct * work)390 static void server_ctrl_handle_work(struct work_struct *work)
391 {
392 struct server_ctrl_struct *ctrl;
393
394 ctrl = container_of(work, struct server_ctrl_struct, ctrl_work);
395
396 mutex_lock(&ctrl_lock);
397 switch (ctrl->type) {
398 case SERVER_CTRL_TYPE_INIT:
399 server_ctrl_handle_init(ctrl);
400 break;
401 case SERVER_CTRL_TYPE_RESET:
402 server_ctrl_handle_reset(ctrl);
403 break;
404 default:
405 pr_err("Unknown server work type: %d\n", ctrl->type);
406 }
407 mutex_unlock(&ctrl_lock);
408 kfree(ctrl);
409 module_put(THIS_MODULE);
410 }
411
__queue_ctrl_work(int type)412 static int __queue_ctrl_work(int type)
413 {
414 struct server_ctrl_struct *ctrl;
415
416 ctrl = kmalloc(sizeof(struct server_ctrl_struct), GFP_KERNEL);
417 if (!ctrl)
418 return -ENOMEM;
419
420 __module_get(THIS_MODULE);
421 ctrl->type = type;
422 INIT_WORK(&ctrl->ctrl_work, server_ctrl_handle_work);
423 queue_work(system_long_wq, &ctrl->ctrl_work);
424 return 0;
425 }
426
server_queue_ctrl_init_work(void)427 int server_queue_ctrl_init_work(void)
428 {
429 return __queue_ctrl_work(SERVER_CTRL_TYPE_INIT);
430 }
431
server_queue_ctrl_reset_work(void)432 int server_queue_ctrl_reset_work(void)
433 {
434 return __queue_ctrl_work(SERVER_CTRL_TYPE_RESET);
435 }
436
stats_show(const struct class * class,const struct class_attribute * attr,char * buf)437 static ssize_t stats_show(const struct class *class, const struct class_attribute *attr,
438 char *buf)
439 {
440 /*
441 * Inc this each time you change stats output format,
442 * so user space will know what to do.
443 */
444 static int stats_version = 2;
445 static const char * const state[] = {
446 "startup",
447 "running",
448 "reset",
449 "shutdown"
450 };
451 return sysfs_emit(buf, "%d %s %d %lu\n", stats_version,
452 state[server_conf.state], server_conf.tcp_port,
453 server_conf.ipc_last_active / HZ);
454 }
455
kill_server_store(const struct class * class,const struct class_attribute * attr,const char * buf,size_t len)456 static ssize_t kill_server_store(const struct class *class,
457 const struct class_attribute *attr, const char *buf,
458 size_t len)
459 {
460 if (!sysfs_streq(buf, "hard"))
461 return len;
462
463 pr_info("kill command received\n");
464 mutex_lock(&ctrl_lock);
465 WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING);
466 __module_get(THIS_MODULE);
467 server_ctrl_handle_reset(NULL);
468 module_put(THIS_MODULE);
469 mutex_unlock(&ctrl_lock);
470 return len;
471 }
472
473 static const char * const debug_type_strings[] = {"smb", "auth", "vfs",
474 "oplock", "ipc", "conn",
475 "rdma"};
476
debug_show(const struct class * class,const struct class_attribute * attr,char * buf)477 static ssize_t debug_show(const struct class *class, const struct class_attribute *attr,
478 char *buf)
479 {
480 ssize_t sz = 0;
481 int i, pos = 0;
482
483 for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) {
484 if ((ksmbd_debug_types >> i) & 1) {
485 pos = sysfs_emit_at(buf, sz, "[%s] ", debug_type_strings[i]);
486 } else {
487 pos = sysfs_emit_at(buf, sz, "%s ", debug_type_strings[i]);
488 }
489 sz += pos;
490 }
491 sz += sysfs_emit_at(buf, sz, "\n");
492 return sz;
493 }
494
debug_store(const struct class * class,const struct class_attribute * attr,const char * buf,size_t len)495 static ssize_t debug_store(const struct class *class, const struct class_attribute *attr,
496 const char *buf, size_t len)
497 {
498 int i;
499
500 for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) {
501 if (sysfs_streq(buf, "all")) {
502 if (ksmbd_debug_types == KSMBD_DEBUG_ALL)
503 ksmbd_debug_types = 0;
504 else
505 ksmbd_debug_types = KSMBD_DEBUG_ALL;
506 break;
507 }
508
509 if (sysfs_streq(buf, debug_type_strings[i])) {
510 if (ksmbd_debug_types & (1 << i))
511 ksmbd_debug_types &= ~(1 << i);
512 else
513 ksmbd_debug_types |= (1 << i);
514 break;
515 }
516 }
517
518 return len;
519 }
520
521 static CLASS_ATTR_RO(stats);
522 static CLASS_ATTR_WO(kill_server);
523 static CLASS_ATTR_RW(debug);
524
525 static struct attribute *ksmbd_control_class_attrs[] = {
526 &class_attr_stats.attr,
527 &class_attr_kill_server.attr,
528 &class_attr_debug.attr,
529 NULL,
530 };
531 ATTRIBUTE_GROUPS(ksmbd_control_class);
532
533 static struct class ksmbd_control_class = {
534 .name = "ksmbd-control",
535 .class_groups = ksmbd_control_class_groups,
536 };
537
ksmbd_server_shutdown(void)538 static int ksmbd_server_shutdown(void)
539 {
540 WRITE_ONCE(server_conf.state, SERVER_STATE_SHUTTING_DOWN);
541
542 class_unregister(&ksmbd_control_class);
543 ksmbd_workqueue_destroy();
544 ksmbd_ipc_release();
545 ksmbd_conn_transport_destroy();
546 ksmbd_crypto_destroy();
547 ksmbd_free_global_file_table();
548 destroy_lease_table(NULL);
549 ksmbd_work_pool_destroy();
550 ksmbd_exit_file_cache();
551 server_conf_free();
552 return 0;
553 }
554
ksmbd_server_init(void)555 static int __init ksmbd_server_init(void)
556 {
557 int ret;
558
559 ret = class_register(&ksmbd_control_class);
560 if (ret) {
561 pr_err("Unable to register ksmbd-control class\n");
562 return ret;
563 }
564
565 ksmbd_server_tcp_callbacks_init();
566
567 ret = server_conf_init();
568 if (ret)
569 goto err_unregister;
570
571 ret = ksmbd_work_pool_init();
572 if (ret)
573 goto err_unregister;
574
575 ret = ksmbd_init_file_cache();
576 if (ret)
577 goto err_destroy_work_pools;
578
579 ret = ksmbd_ipc_init();
580 if (ret)
581 goto err_exit_file_cache;
582
583 ret = ksmbd_init_global_file_table();
584 if (ret)
585 goto err_ipc_release;
586
587 ret = ksmbd_inode_hash_init();
588 if (ret)
589 goto err_destroy_file_table;
590
591 ret = ksmbd_crypto_create();
592 if (ret)
593 goto err_release_inode_hash;
594
595 ret = ksmbd_workqueue_init();
596 if (ret)
597 goto err_crypto_destroy;
598
599 return 0;
600
601 err_crypto_destroy:
602 ksmbd_crypto_destroy();
603 err_release_inode_hash:
604 ksmbd_release_inode_hash();
605 err_destroy_file_table:
606 ksmbd_free_global_file_table();
607 err_ipc_release:
608 ksmbd_ipc_release();
609 err_exit_file_cache:
610 ksmbd_exit_file_cache();
611 err_destroy_work_pools:
612 ksmbd_work_pool_destroy();
613 err_unregister:
614 class_unregister(&ksmbd_control_class);
615
616 return ret;
617 }
618
619 /**
620 * ksmbd_server_exit() - shutdown forker thread and free memory at module exit
621 */
ksmbd_server_exit(void)622 static void __exit ksmbd_server_exit(void)
623 {
624 ksmbd_server_shutdown();
625 rcu_barrier();
626 ksmbd_release_inode_hash();
627 }
628
629 MODULE_AUTHOR("Namjae Jeon <linkinjeon@kernel.org>");
630 MODULE_VERSION(KSMBD_VERSION);
631 MODULE_DESCRIPTION("Linux kernel CIFS/SMB SERVER");
632 MODULE_LICENSE("GPL");
633 MODULE_SOFTDEP("pre: ecb");
634 MODULE_SOFTDEP("pre: hmac");
635 MODULE_SOFTDEP("pre: md5");
636 MODULE_SOFTDEP("pre: nls");
637 MODULE_SOFTDEP("pre: aes");
638 MODULE_SOFTDEP("pre: cmac");
639 MODULE_SOFTDEP("pre: sha256");
640 MODULE_SOFTDEP("pre: sha512");
641 MODULE_SOFTDEP("pre: aead2");
642 MODULE_SOFTDEP("pre: ccm");
643 MODULE_SOFTDEP("pre: gcm");
644 MODULE_SOFTDEP("pre: crc32");
645 module_init(ksmbd_server_init)
646 module_exit(ksmbd_server_exit)
647