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 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 } 162 163 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 */ 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 proccessing smb command and sending response 283 * @conn: connection instance 284 * 285 * read remaining data from socket create and submit work. 286 */ 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 } 316 317 static int ksmbd_server_process_request(struct ksmbd_conn *conn) 318 { 319 return queue_ksmbd_work(conn); 320 } 321 322 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 } 328 329 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 } 338 339 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 } 348 349 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 } 362 363 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 } 375 376 static void server_ctrl_handle_reset(struct server_ctrl_struct *ctrl) 377 { 378 ksmbd_ipc_soft_reset(); 379 ksmbd_conn_transport_destroy(); 380 server_conf_free(); 381 server_conf_init(); 382 WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP); 383 } 384 385 static void server_ctrl_handle_work(struct work_struct *work) 386 { 387 struct server_ctrl_struct *ctrl; 388 389 ctrl = container_of(work, struct server_ctrl_struct, ctrl_work); 390 391 mutex_lock(&ctrl_lock); 392 switch (ctrl->type) { 393 case SERVER_CTRL_TYPE_INIT: 394 server_ctrl_handle_init(ctrl); 395 break; 396 case SERVER_CTRL_TYPE_RESET: 397 server_ctrl_handle_reset(ctrl); 398 break; 399 default: 400 pr_err("Unknown server work type: %d\n", ctrl->type); 401 } 402 mutex_unlock(&ctrl_lock); 403 kfree(ctrl); 404 module_put(THIS_MODULE); 405 } 406 407 static int __queue_ctrl_work(int type) 408 { 409 struct server_ctrl_struct *ctrl; 410 411 ctrl = kmalloc(sizeof(struct server_ctrl_struct), GFP_KERNEL); 412 if (!ctrl) 413 return -ENOMEM; 414 415 __module_get(THIS_MODULE); 416 ctrl->type = type; 417 INIT_WORK(&ctrl->ctrl_work, server_ctrl_handle_work); 418 queue_work(system_long_wq, &ctrl->ctrl_work); 419 return 0; 420 } 421 422 int server_queue_ctrl_init_work(void) 423 { 424 return __queue_ctrl_work(SERVER_CTRL_TYPE_INIT); 425 } 426 427 int server_queue_ctrl_reset_work(void) 428 { 429 return __queue_ctrl_work(SERVER_CTRL_TYPE_RESET); 430 } 431 432 static ssize_t stats_show(const struct class *class, const struct class_attribute *attr, 433 char *buf) 434 { 435 /* 436 * Inc this each time you change stats output format, 437 * so user space will know what to do. 438 */ 439 static int stats_version = 2; 440 static const char * const state[] = { 441 "startup", 442 "running", 443 "reset", 444 "shutdown" 445 }; 446 return sysfs_emit(buf, "%d %s %d %lu\n", stats_version, 447 state[server_conf.state], server_conf.tcp_port, 448 server_conf.ipc_last_active / HZ); 449 } 450 451 static ssize_t kill_server_store(const struct class *class, 452 const struct class_attribute *attr, const char *buf, 453 size_t len) 454 { 455 if (!sysfs_streq(buf, "hard")) 456 return len; 457 458 pr_info("kill command received\n"); 459 mutex_lock(&ctrl_lock); 460 WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING); 461 __module_get(THIS_MODULE); 462 server_ctrl_handle_reset(NULL); 463 module_put(THIS_MODULE); 464 mutex_unlock(&ctrl_lock); 465 return len; 466 } 467 468 static const char * const debug_type_strings[] = {"smb", "auth", "vfs", 469 "oplock", "ipc", "conn", 470 "rdma"}; 471 472 static ssize_t debug_show(const struct class *class, const struct class_attribute *attr, 473 char *buf) 474 { 475 ssize_t sz = 0; 476 int i, pos = 0; 477 478 for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) { 479 if ((ksmbd_debug_types >> i) & 1) { 480 pos = sysfs_emit_at(buf, sz, "[%s] ", debug_type_strings[i]); 481 } else { 482 pos = sysfs_emit_at(buf, sz, "%s ", debug_type_strings[i]); 483 } 484 sz += pos; 485 } 486 sz += sysfs_emit_at(buf, sz, "\n"); 487 return sz; 488 } 489 490 static ssize_t debug_store(const struct class *class, const struct class_attribute *attr, 491 const char *buf, size_t len) 492 { 493 int i; 494 495 for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) { 496 if (sysfs_streq(buf, "all")) { 497 if (ksmbd_debug_types == KSMBD_DEBUG_ALL) 498 ksmbd_debug_types = 0; 499 else 500 ksmbd_debug_types = KSMBD_DEBUG_ALL; 501 break; 502 } 503 504 if (sysfs_streq(buf, debug_type_strings[i])) { 505 if (ksmbd_debug_types & (1 << i)) 506 ksmbd_debug_types &= ~(1 << i); 507 else 508 ksmbd_debug_types |= (1 << i); 509 break; 510 } 511 } 512 513 return len; 514 } 515 516 static CLASS_ATTR_RO(stats); 517 static CLASS_ATTR_WO(kill_server); 518 static CLASS_ATTR_RW(debug); 519 520 static struct attribute *ksmbd_control_class_attrs[] = { 521 &class_attr_stats.attr, 522 &class_attr_kill_server.attr, 523 &class_attr_debug.attr, 524 NULL, 525 }; 526 ATTRIBUTE_GROUPS(ksmbd_control_class); 527 528 static struct class ksmbd_control_class = { 529 .name = "ksmbd-control", 530 .class_groups = ksmbd_control_class_groups, 531 }; 532 533 static int ksmbd_server_shutdown(void) 534 { 535 WRITE_ONCE(server_conf.state, SERVER_STATE_SHUTTING_DOWN); 536 537 class_unregister(&ksmbd_control_class); 538 ksmbd_workqueue_destroy(); 539 ksmbd_ipc_release(); 540 ksmbd_conn_transport_destroy(); 541 ksmbd_crypto_destroy(); 542 ksmbd_free_global_file_table(); 543 destroy_lease_table(NULL); 544 ksmbd_work_pool_destroy(); 545 ksmbd_exit_file_cache(); 546 server_conf_free(); 547 return 0; 548 } 549 550 static int __init ksmbd_server_init(void) 551 { 552 int ret; 553 554 ret = class_register(&ksmbd_control_class); 555 if (ret) { 556 pr_err("Unable to register ksmbd-control class\n"); 557 return ret; 558 } 559 560 ksmbd_server_tcp_callbacks_init(); 561 562 ret = server_conf_init(); 563 if (ret) 564 goto err_unregister; 565 566 ret = ksmbd_work_pool_init(); 567 if (ret) 568 goto err_unregister; 569 570 ret = ksmbd_init_file_cache(); 571 if (ret) 572 goto err_destroy_work_pools; 573 574 ret = ksmbd_ipc_init(); 575 if (ret) 576 goto err_exit_file_cache; 577 578 ret = ksmbd_init_global_file_table(); 579 if (ret) 580 goto err_ipc_release; 581 582 ret = ksmbd_inode_hash_init(); 583 if (ret) 584 goto err_destroy_file_table; 585 586 ret = ksmbd_crypto_create(); 587 if (ret) 588 goto err_release_inode_hash; 589 590 ret = ksmbd_workqueue_init(); 591 if (ret) 592 goto err_crypto_destroy; 593 594 return 0; 595 596 err_crypto_destroy: 597 ksmbd_crypto_destroy(); 598 err_release_inode_hash: 599 ksmbd_release_inode_hash(); 600 err_destroy_file_table: 601 ksmbd_free_global_file_table(); 602 err_ipc_release: 603 ksmbd_ipc_release(); 604 err_exit_file_cache: 605 ksmbd_exit_file_cache(); 606 err_destroy_work_pools: 607 ksmbd_work_pool_destroy(); 608 err_unregister: 609 class_unregister(&ksmbd_control_class); 610 611 return ret; 612 } 613 614 /** 615 * ksmbd_server_exit() - shutdown forker thread and free memory at module exit 616 */ 617 static void __exit ksmbd_server_exit(void) 618 { 619 ksmbd_server_shutdown(); 620 rcu_barrier(); 621 ksmbd_release_inode_hash(); 622 } 623 624 MODULE_AUTHOR("Namjae Jeon <linkinjeon@kernel.org>"); 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