xref: /linux/fs/smb/server/server.c (revision 88872790923e2d80edf29a00b4e440f1473fa8f5)
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 
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 
56 int ksmbd_set_netbios_name(char *v)
57 {
58 	return ___server_conf_set(SERVER_CONF_NETBIOS_NAME, v);
59 }
60 
61 int ksmbd_set_server_string(char *v)
62 {
63 	return ___server_conf_set(SERVER_CONF_SERVER_STRING, v);
64 }
65 
66 int ksmbd_set_work_group(char *v)
67 {
68 	return ___server_conf_set(SERVER_CONF_WORK_GROUP, v);
69 }
70 
71 char *ksmbd_netbios_name(void)
72 {
73 	return server_conf.conf[SERVER_CONF_NETBIOS_NAME];
74 }
75 
76 char *ksmbd_server_string(void)
77 {
78 	return server_conf.conf[SERVER_CONF_SERVER_STRING];
79 }
80 
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  */
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 
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 		return SERVER_HANDLER_ABORT;
120 
121 	command = conn->ops->get_cmd_val(work);
122 	*cmd = command;
123 
124 andx_again:
125 	if (command >= conn->max_cmds) {
126 		conn->ops->set_rsp_status(work, STATUS_INVALID_PARAMETER);
127 		return SERVER_HANDLER_CONTINUE;
128 	}
129 
130 	cmds = &conn->cmds[command];
131 	if (!cmds->proc) {
132 		ksmbd_debug(SMB, "*** not implemented yet cmd = %x\n", command);
133 		conn->ops->set_rsp_status(work, STATUS_NOT_IMPLEMENTED);
134 		return SERVER_HANDLER_CONTINUE;
135 	}
136 
137 	if (work->sess && conn->ops->is_sign_req(work, command)) {
138 		ret = conn->ops->check_sign_req(work);
139 		if (!ret) {
140 			conn->ops->set_rsp_status(work, STATUS_ACCESS_DENIED);
141 			return SERVER_HANDLER_CONTINUE;
142 		}
143 	}
144 
145 	ret = cmds->proc(work);
146 
147 	if (ret < 0)
148 		ksmbd_debug(CONN, "Failed to process %u [%d]\n", command, ret);
149 	/* AndX commands - chained request can return positive values */
150 	else if (ret > 0) {
151 		command = ret;
152 		*cmd = command;
153 		goto andx_again;
154 	}
155 
156 	if (work->send_no_response)
157 		return SERVER_HANDLER_ABORT;
158 	return SERVER_HANDLER_CONTINUE;
159 }
160 
161 static void __handle_ksmbd_work(struct ksmbd_work *work,
162 				struct ksmbd_conn *conn)
163 {
164 	u16 command = 0;
165 	int rc;
166 	bool is_chained = false;
167 
168 	if (conn->ops->allocate_rsp_buf(work))
169 		return;
170 
171 	if (conn->ops->is_transform_hdr &&
172 	    conn->ops->is_transform_hdr(work->request_buf)) {
173 		rc = conn->ops->decrypt_req(work);
174 		if (rc < 0) {
175 			conn->ops->set_rsp_status(work, STATUS_DATA_ERROR);
176 			goto send;
177 		}
178 
179 		work->encrypted = true;
180 	}
181 
182 	rc = conn->ops->init_rsp_hdr(work);
183 	if (rc) {
184 		/* either uid or tid is not correct */
185 		conn->ops->set_rsp_status(work, STATUS_INVALID_HANDLE);
186 		goto send;
187 	}
188 
189 	do {
190 		if (conn->ops->check_user_session) {
191 			rc = conn->ops->check_user_session(work);
192 			if (rc < 0) {
193 				if (rc == -EINVAL)
194 					conn->ops->set_rsp_status(work,
195 						STATUS_INVALID_PARAMETER);
196 				else
197 					conn->ops->set_rsp_status(work,
198 						STATUS_USER_SESSION_DELETED);
199 				goto send;
200 			} else if (rc > 0) {
201 				rc = conn->ops->get_ksmbd_tcon(work);
202 				if (rc < 0) {
203 					if (rc == -EINVAL)
204 						conn->ops->set_rsp_status(work,
205 							STATUS_INVALID_PARAMETER);
206 					else
207 						conn->ops->set_rsp_status(work,
208 							STATUS_NETWORK_NAME_DELETED);
209 					goto send;
210 				}
211 			}
212 		}
213 
214 		rc = __process_request(work, conn, &command);
215 		if (rc == SERVER_HANDLER_ABORT)
216 			break;
217 
218 		/*
219 		 * Call smb2_set_rsp_credits() function to set number of credits
220 		 * granted in hdr of smb2 response.
221 		 */
222 		if (conn->ops->set_rsp_credits) {
223 			spin_lock(&conn->credits_lock);
224 			rc = conn->ops->set_rsp_credits(work);
225 			spin_unlock(&conn->credits_lock);
226 			if (rc < 0) {
227 				conn->ops->set_rsp_status(work,
228 					STATUS_INVALID_PARAMETER);
229 				goto send;
230 			}
231 		}
232 
233 		is_chained = is_chained_smb2_message(work);
234 
235 		if (work->sess &&
236 		    (work->sess->sign || smb3_11_final_sess_setup_resp(work) ||
237 		     conn->ops->is_sign_req(work, command)))
238 			conn->ops->set_sign_rsp(work);
239 	} while (is_chained == true);
240 
241 send:
242 	smb3_preauth_hash_rsp(work);
243 	if (work->sess && work->sess->enc && work->encrypted &&
244 	    conn->ops->encrypt_resp) {
245 		rc = conn->ops->encrypt_resp(work);
246 		if (rc < 0)
247 			conn->ops->set_rsp_status(work, STATUS_DATA_ERROR);
248 	}
249 
250 	ksmbd_conn_write(work);
251 }
252 
253 /**
254  * handle_ksmbd_work() - process pending smb work requests
255  * @wk:	smb work containing request command buffer
256  *
257  * called by kworker threads to processing remaining smb work requests
258  */
259 static void handle_ksmbd_work(struct work_struct *wk)
260 {
261 	struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
262 	struct ksmbd_conn *conn = work->conn;
263 
264 	atomic64_inc(&conn->stats.request_served);
265 
266 	__handle_ksmbd_work(work, conn);
267 
268 	ksmbd_conn_try_dequeue_request(work);
269 	ksmbd_free_work_struct(work);
270 	/*
271 	 * Checking waitqueue to dropping pending requests on
272 	 * disconnection. waitqueue_active is safe because it
273 	 * uses atomic operation for condition.
274 	 */
275 	if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q))
276 		wake_up(&conn->r_count_q);
277 }
278 
279 /**
280  * queue_ksmbd_work() - queue a smb request to worker thread queue
281  *		for proccessing smb command and sending response
282  * @conn:	connection instance
283  *
284  * read remaining data from socket create and submit work.
285  */
286 static int queue_ksmbd_work(struct ksmbd_conn *conn)
287 {
288 	struct ksmbd_work *work;
289 	int err;
290 
291 	work = ksmbd_alloc_work_struct();
292 	if (!work) {
293 		pr_err("allocation for work failed\n");
294 		return -ENOMEM;
295 	}
296 
297 	work->conn = conn;
298 	work->request_buf = conn->request_buf;
299 	conn->request_buf = NULL;
300 
301 	err = ksmbd_init_smb_server(work);
302 	if (err) {
303 		ksmbd_free_work_struct(work);
304 		return 0;
305 	}
306 
307 	ksmbd_conn_enqueue_request(work);
308 	atomic_inc(&conn->r_count);
309 	/* update activity on connection */
310 	conn->last_active = jiffies;
311 	INIT_WORK(&work->work, handle_ksmbd_work);
312 	ksmbd_queue_work(work);
313 	return 0;
314 }
315 
316 static int ksmbd_server_process_request(struct ksmbd_conn *conn)
317 {
318 	return queue_ksmbd_work(conn);
319 }
320 
321 static int ksmbd_server_terminate_conn(struct ksmbd_conn *conn)
322 {
323 	ksmbd_sessions_deregister(conn);
324 	destroy_lease_table(conn);
325 	return 0;
326 }
327 
328 static void ksmbd_server_tcp_callbacks_init(void)
329 {
330 	struct ksmbd_conn_ops ops;
331 
332 	ops.process_fn = ksmbd_server_process_request;
333 	ops.terminate_fn = ksmbd_server_terminate_conn;
334 
335 	ksmbd_conn_init_server_callbacks(&ops);
336 }
337 
338 static void server_conf_free(void)
339 {
340 	int i;
341 
342 	for (i = 0; i < ARRAY_SIZE(server_conf.conf); i++) {
343 		kfree(server_conf.conf[i]);
344 		server_conf.conf[i] = NULL;
345 	}
346 }
347 
348 static int server_conf_init(void)
349 {
350 	WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP);
351 	server_conf.enforced_signing = 0;
352 	server_conf.min_protocol = ksmbd_min_protocol();
353 	server_conf.max_protocol = ksmbd_max_protocol();
354 	server_conf.auth_mechs = KSMBD_AUTH_NTLMSSP;
355 #ifdef CONFIG_SMB_SERVER_KERBEROS5
356 	server_conf.auth_mechs |= KSMBD_AUTH_KRB5 |
357 				KSMBD_AUTH_MSKRB5;
358 #endif
359 	return 0;
360 }
361 
362 static void server_ctrl_handle_init(struct server_ctrl_struct *ctrl)
363 {
364 	int ret;
365 
366 	ret = ksmbd_conn_transport_init();
367 	if (ret) {
368 		server_queue_ctrl_reset_work();
369 		return;
370 	}
371 
372 	WRITE_ONCE(server_conf.state, SERVER_STATE_RUNNING);
373 }
374 
375 static void server_ctrl_handle_reset(struct server_ctrl_struct *ctrl)
376 {
377 	ksmbd_ipc_soft_reset();
378 	ksmbd_conn_transport_destroy();
379 	server_conf_free();
380 	server_conf_init();
381 	WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP);
382 }
383 
384 static void server_ctrl_handle_work(struct work_struct *work)
385 {
386 	struct server_ctrl_struct *ctrl;
387 
388 	ctrl = container_of(work, struct server_ctrl_struct, ctrl_work);
389 
390 	mutex_lock(&ctrl_lock);
391 	switch (ctrl->type) {
392 	case SERVER_CTRL_TYPE_INIT:
393 		server_ctrl_handle_init(ctrl);
394 		break;
395 	case SERVER_CTRL_TYPE_RESET:
396 		server_ctrl_handle_reset(ctrl);
397 		break;
398 	default:
399 		pr_err("Unknown server work type: %d\n", ctrl->type);
400 	}
401 	mutex_unlock(&ctrl_lock);
402 	kfree(ctrl);
403 	module_put(THIS_MODULE);
404 }
405 
406 static int __queue_ctrl_work(int type)
407 {
408 	struct server_ctrl_struct *ctrl;
409 
410 	ctrl = kmalloc(sizeof(struct server_ctrl_struct), GFP_KERNEL);
411 	if (!ctrl)
412 		return -ENOMEM;
413 
414 	__module_get(THIS_MODULE);
415 	ctrl->type = type;
416 	INIT_WORK(&ctrl->ctrl_work, server_ctrl_handle_work);
417 	queue_work(system_long_wq, &ctrl->ctrl_work);
418 	return 0;
419 }
420 
421 int server_queue_ctrl_init_work(void)
422 {
423 	return __queue_ctrl_work(SERVER_CTRL_TYPE_INIT);
424 }
425 
426 int server_queue_ctrl_reset_work(void)
427 {
428 	return __queue_ctrl_work(SERVER_CTRL_TYPE_RESET);
429 }
430 
431 static ssize_t stats_show(const struct class *class, const struct class_attribute *attr,
432 			  char *buf)
433 {
434 	/*
435 	 * Inc this each time you change stats output format,
436 	 * so user space will know what to do.
437 	 */
438 	static int stats_version = 2;
439 	static const char * const state[] = {
440 		"startup",
441 		"running",
442 		"reset",
443 		"shutdown"
444 	};
445 	return sysfs_emit(buf, "%d %s %d %lu\n", stats_version,
446 			  state[server_conf.state], server_conf.tcp_port,
447 			  server_conf.ipc_last_active / HZ);
448 }
449 
450 static ssize_t kill_server_store(const struct class *class,
451 				 const struct class_attribute *attr, const char *buf,
452 				 size_t len)
453 {
454 	if (!sysfs_streq(buf, "hard"))
455 		return len;
456 
457 	pr_info("kill command received\n");
458 	mutex_lock(&ctrl_lock);
459 	WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING);
460 	__module_get(THIS_MODULE);
461 	server_ctrl_handle_reset(NULL);
462 	module_put(THIS_MODULE);
463 	mutex_unlock(&ctrl_lock);
464 	return len;
465 }
466 
467 static const char * const debug_type_strings[] = {"smb", "auth", "vfs",
468 						  "oplock", "ipc", "conn",
469 						  "rdma"};
470 
471 static ssize_t debug_show(const struct class *class, const struct class_attribute *attr,
472 			  char *buf)
473 {
474 	ssize_t sz = 0;
475 	int i, pos = 0;
476 
477 	for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) {
478 		if ((ksmbd_debug_types >> i) & 1) {
479 			pos = sysfs_emit_at(buf, sz, "[%s] ", debug_type_strings[i]);
480 		} else {
481 			pos = sysfs_emit_at(buf, sz, "%s ", debug_type_strings[i]);
482 		}
483 		sz += pos;
484 	}
485 	sz += sysfs_emit_at(buf, sz, "\n");
486 	return sz;
487 }
488 
489 static ssize_t debug_store(const struct class *class, const struct class_attribute *attr,
490 			   const char *buf, size_t len)
491 {
492 	int i;
493 
494 	for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) {
495 		if (sysfs_streq(buf, "all")) {
496 			if (ksmbd_debug_types == KSMBD_DEBUG_ALL)
497 				ksmbd_debug_types = 0;
498 			else
499 				ksmbd_debug_types = KSMBD_DEBUG_ALL;
500 			break;
501 		}
502 
503 		if (sysfs_streq(buf, debug_type_strings[i])) {
504 			if (ksmbd_debug_types & (1 << i))
505 				ksmbd_debug_types &= ~(1 << i);
506 			else
507 				ksmbd_debug_types |= (1 << i);
508 			break;
509 		}
510 	}
511 
512 	return len;
513 }
514 
515 static CLASS_ATTR_RO(stats);
516 static CLASS_ATTR_WO(kill_server);
517 static CLASS_ATTR_RW(debug);
518 
519 static struct attribute *ksmbd_control_class_attrs[] = {
520 	&class_attr_stats.attr,
521 	&class_attr_kill_server.attr,
522 	&class_attr_debug.attr,
523 	NULL,
524 };
525 ATTRIBUTE_GROUPS(ksmbd_control_class);
526 
527 static struct class ksmbd_control_class = {
528 	.name		= "ksmbd-control",
529 	.class_groups	= ksmbd_control_class_groups,
530 };
531 
532 static int ksmbd_server_shutdown(void)
533 {
534 	WRITE_ONCE(server_conf.state, SERVER_STATE_SHUTTING_DOWN);
535 
536 	class_unregister(&ksmbd_control_class);
537 	ksmbd_workqueue_destroy();
538 	ksmbd_ipc_release();
539 	ksmbd_conn_transport_destroy();
540 	ksmbd_crypto_destroy();
541 	ksmbd_free_global_file_table();
542 	destroy_lease_table(NULL);
543 	ksmbd_work_pool_destroy();
544 	ksmbd_exit_file_cache();
545 	server_conf_free();
546 	return 0;
547 }
548 
549 static int __init ksmbd_server_init(void)
550 {
551 	int ret;
552 
553 	ret = class_register(&ksmbd_control_class);
554 	if (ret) {
555 		pr_err("Unable to register ksmbd-control class\n");
556 		return ret;
557 	}
558 
559 	ksmbd_server_tcp_callbacks_init();
560 
561 	ret = server_conf_init();
562 	if (ret)
563 		goto err_unregister;
564 
565 	ret = ksmbd_work_pool_init();
566 	if (ret)
567 		goto err_unregister;
568 
569 	ret = ksmbd_init_file_cache();
570 	if (ret)
571 		goto err_destroy_work_pools;
572 
573 	ret = ksmbd_ipc_init();
574 	if (ret)
575 		goto err_exit_file_cache;
576 
577 	ret = ksmbd_init_global_file_table();
578 	if (ret)
579 		goto err_ipc_release;
580 
581 	ret = ksmbd_inode_hash_init();
582 	if (ret)
583 		goto err_destroy_file_table;
584 
585 	ret = ksmbd_crypto_create();
586 	if (ret)
587 		goto err_release_inode_hash;
588 
589 	ret = ksmbd_workqueue_init();
590 	if (ret)
591 		goto err_crypto_destroy;
592 
593 	return 0;
594 
595 err_crypto_destroy:
596 	ksmbd_crypto_destroy();
597 err_release_inode_hash:
598 	ksmbd_release_inode_hash();
599 err_destroy_file_table:
600 	ksmbd_free_global_file_table();
601 err_ipc_release:
602 	ksmbd_ipc_release();
603 err_exit_file_cache:
604 	ksmbd_exit_file_cache();
605 err_destroy_work_pools:
606 	ksmbd_work_pool_destroy();
607 err_unregister:
608 	class_unregister(&ksmbd_control_class);
609 
610 	return ret;
611 }
612 
613 /**
614  * ksmbd_server_exit() - shutdown forker thread and free memory at module exit
615  */
616 static void __exit ksmbd_server_exit(void)
617 {
618 	ksmbd_server_shutdown();
619 	rcu_barrier();
620 	ksmbd_release_inode_hash();
621 }
622 
623 MODULE_AUTHOR("Namjae Jeon <linkinjeon@kernel.org>");
624 MODULE_VERSION(KSMBD_VERSION);
625 MODULE_DESCRIPTION("Linux kernel CIFS/SMB SERVER");
626 MODULE_LICENSE("GPL");
627 MODULE_SOFTDEP("pre: ecb");
628 MODULE_SOFTDEP("pre: hmac");
629 MODULE_SOFTDEP("pre: md5");
630 MODULE_SOFTDEP("pre: nls");
631 MODULE_SOFTDEP("pre: aes");
632 MODULE_SOFTDEP("pre: cmac");
633 MODULE_SOFTDEP("pre: sha256");
634 MODULE_SOFTDEP("pre: sha512");
635 MODULE_SOFTDEP("pre: aead2");
636 MODULE_SOFTDEP("pre: ccm");
637 MODULE_SOFTDEP("pre: gcm");
638 MODULE_SOFTDEP("pre: crc32");
639 module_init(ksmbd_server_init)
640 module_exit(ksmbd_server_exit)
641