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, *old; 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), KSMBD_DEFAULT_GFP); 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 old = xa_store(&sess->rpc_handle_list, entry->id, entry, KSMBD_DEFAULT_GFP); 110 if (xa_is_err(old)) 111 goto free_id; 112 113 resp = ksmbd_rpc_open(sess, entry->id); 114 if (!resp) 115 goto erase_xa; 116 117 kvfree(resp); 118 return entry->id; 119 erase_xa: 120 xa_erase(&sess->rpc_handle_list, entry->id); 121 free_id: 122 ksmbd_rpc_id_free(entry->id); 123 free_entry: 124 kfree(entry); 125 return -EINVAL; 126 } 127 128 void ksmbd_session_rpc_close(struct ksmbd_session *sess, int id) 129 { 130 struct ksmbd_session_rpc *entry; 131 132 entry = xa_erase(&sess->rpc_handle_list, id); 133 if (entry) 134 __session_rpc_close(sess, entry); 135 } 136 137 int ksmbd_session_rpc_method(struct ksmbd_session *sess, int id) 138 { 139 struct ksmbd_session_rpc *entry; 140 141 entry = xa_load(&sess->rpc_handle_list, id); 142 return entry ? entry->method : 0; 143 } 144 145 void ksmbd_session_destroy(struct ksmbd_session *sess) 146 { 147 if (!sess) 148 return; 149 150 if (sess->user) 151 ksmbd_free_user(sess->user); 152 153 ksmbd_tree_conn_session_logoff(sess); 154 ksmbd_destroy_file_table(&sess->file_table); 155 ksmbd_launch_ksmbd_durable_scavenger(); 156 ksmbd_session_rpc_clear_list(sess); 157 free_channel_list(sess); 158 kfree(sess->Preauth_HashValue); 159 ksmbd_release_id(&session_ida, sess->id); 160 kfree(sess); 161 } 162 163 struct ksmbd_session *__session_lookup(unsigned long long id) 164 { 165 struct ksmbd_session *sess; 166 167 hash_for_each_possible(sessions_table, sess, hlist, id) { 168 if (id == sess->id) { 169 sess->last_active = jiffies; 170 return sess; 171 } 172 } 173 return NULL; 174 } 175 176 static void ksmbd_expire_session(struct ksmbd_conn *conn) 177 { 178 unsigned long id; 179 struct ksmbd_session *sess; 180 181 down_write(&sessions_table_lock); 182 down_write(&conn->session_lock); 183 xa_for_each(&conn->sessions, id, sess) { 184 if (atomic_read(&sess->refcnt) == 0 && 185 (sess->state != SMB2_SESSION_VALID || 186 time_after(jiffies, 187 sess->last_active + SMB2_SESSION_TIMEOUT))) { 188 xa_erase(&conn->sessions, sess->id); 189 hash_del(&sess->hlist); 190 ksmbd_session_destroy(sess); 191 continue; 192 } 193 } 194 up_write(&conn->session_lock); 195 up_write(&sessions_table_lock); 196 } 197 198 int ksmbd_session_register(struct ksmbd_conn *conn, 199 struct ksmbd_session *sess) 200 { 201 sess->dialect = conn->dialect; 202 memcpy(sess->ClientGUID, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE); 203 ksmbd_expire_session(conn); 204 return xa_err(xa_store(&conn->sessions, sess->id, sess, KSMBD_DEFAULT_GFP)); 205 } 206 207 static int ksmbd_chann_del(struct ksmbd_conn *conn, struct ksmbd_session *sess) 208 { 209 struct channel *chann; 210 211 chann = xa_erase(&sess->ksmbd_chann_list, (long)conn); 212 if (!chann) 213 return -ENOENT; 214 215 kfree(chann); 216 return 0; 217 } 218 219 void ksmbd_sessions_deregister(struct ksmbd_conn *conn) 220 { 221 struct ksmbd_session *sess; 222 unsigned long id; 223 224 down_write(&sessions_table_lock); 225 if (conn->binding) { 226 int bkt; 227 struct hlist_node *tmp; 228 229 hash_for_each_safe(sessions_table, bkt, tmp, sess, hlist) { 230 if (!ksmbd_chann_del(conn, sess) && 231 xa_empty(&sess->ksmbd_chann_list)) { 232 hash_del(&sess->hlist); 233 ksmbd_session_destroy(sess); 234 } 235 } 236 } 237 238 down_write(&conn->session_lock); 239 xa_for_each(&conn->sessions, id, sess) { 240 unsigned long chann_id; 241 struct channel *chann; 242 243 xa_for_each(&sess->ksmbd_chann_list, chann_id, chann) { 244 if (chann->conn != conn) 245 ksmbd_conn_set_exiting(chann->conn); 246 } 247 248 ksmbd_chann_del(conn, sess); 249 if (xa_empty(&sess->ksmbd_chann_list)) { 250 xa_erase(&conn->sessions, sess->id); 251 hash_del(&sess->hlist); 252 ksmbd_session_destroy(sess); 253 } 254 } 255 up_write(&conn->session_lock); 256 up_write(&sessions_table_lock); 257 } 258 259 struct ksmbd_session *ksmbd_session_lookup(struct ksmbd_conn *conn, 260 unsigned long long id) 261 { 262 struct ksmbd_session *sess; 263 264 down_read(&conn->session_lock); 265 sess = xa_load(&conn->sessions, id); 266 if (sess) { 267 sess->last_active = jiffies; 268 ksmbd_user_session_get(sess); 269 } 270 up_read(&conn->session_lock); 271 return sess; 272 } 273 274 struct ksmbd_session *ksmbd_session_lookup_slowpath(unsigned long long id) 275 { 276 struct ksmbd_session *sess; 277 278 down_read(&sessions_table_lock); 279 sess = __session_lookup(id); 280 if (sess) 281 ksmbd_user_session_get(sess); 282 up_read(&sessions_table_lock); 283 284 return sess; 285 } 286 287 struct ksmbd_session *ksmbd_session_lookup_all(struct ksmbd_conn *conn, 288 unsigned long long id) 289 { 290 struct ksmbd_session *sess; 291 292 sess = ksmbd_session_lookup(conn, id); 293 if (!sess && conn->binding) 294 sess = ksmbd_session_lookup_slowpath(id); 295 if (sess && sess->state != SMB2_SESSION_VALID) 296 sess = NULL; 297 return sess; 298 } 299 300 void ksmbd_user_session_get(struct ksmbd_session *sess) 301 { 302 atomic_inc(&sess->refcnt); 303 } 304 305 void ksmbd_user_session_put(struct ksmbd_session *sess) 306 { 307 if (!sess) 308 return; 309 310 if (atomic_read(&sess->refcnt) <= 0) 311 WARN_ON(1); 312 else 313 atomic_dec(&sess->refcnt); 314 } 315 316 struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn, 317 u64 sess_id) 318 { 319 struct preauth_session *sess; 320 321 sess = kmalloc(sizeof(struct preauth_session), KSMBD_DEFAULT_GFP); 322 if (!sess) 323 return NULL; 324 325 sess->id = sess_id; 326 memcpy(sess->Preauth_HashValue, conn->preauth_info->Preauth_HashValue, 327 PREAUTH_HASHVALUE_SIZE); 328 list_add(&sess->preauth_entry, &conn->preauth_sess_table); 329 330 return sess; 331 } 332 333 void destroy_previous_session(struct ksmbd_conn *conn, 334 struct ksmbd_user *user, u64 id) 335 { 336 struct ksmbd_session *prev_sess; 337 struct ksmbd_user *prev_user; 338 int err; 339 340 down_write(&sessions_table_lock); 341 down_write(&conn->session_lock); 342 prev_sess = __session_lookup(id); 343 if (!prev_sess || prev_sess->state == SMB2_SESSION_EXPIRED) 344 goto out; 345 346 prev_user = prev_sess->user; 347 if (!prev_user || 348 strcmp(user->name, prev_user->name) || 349 user->passkey_sz != prev_user->passkey_sz || 350 memcmp(user->passkey, prev_user->passkey, user->passkey_sz)) 351 goto out; 352 353 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_RECONNECT); 354 err = ksmbd_conn_wait_idle_sess_id(conn, id); 355 if (err) { 356 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_NEGOTIATE); 357 goto out; 358 } 359 360 ksmbd_destroy_file_table(&prev_sess->file_table); 361 prev_sess->state = SMB2_SESSION_EXPIRED; 362 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_NEGOTIATE); 363 ksmbd_launch_ksmbd_durable_scavenger(); 364 out: 365 up_write(&conn->session_lock); 366 up_write(&sessions_table_lock); 367 } 368 369 static bool ksmbd_preauth_session_id_match(struct preauth_session *sess, 370 unsigned long long id) 371 { 372 return sess->id == id; 373 } 374 375 struct preauth_session *ksmbd_preauth_session_lookup(struct ksmbd_conn *conn, 376 unsigned long long id) 377 { 378 struct preauth_session *sess = NULL; 379 380 list_for_each_entry(sess, &conn->preauth_sess_table, preauth_entry) { 381 if (ksmbd_preauth_session_id_match(sess, id)) 382 return sess; 383 } 384 return NULL; 385 } 386 387 static int __init_smb2_session(struct ksmbd_session *sess) 388 { 389 int id = ksmbd_acquire_smb2_uid(&session_ida); 390 391 if (id < 0) 392 return -EINVAL; 393 sess->id = id; 394 return 0; 395 } 396 397 static struct ksmbd_session *__session_create(int protocol) 398 { 399 struct ksmbd_session *sess; 400 int ret; 401 402 if (protocol != CIFDS_SESSION_FLAG_SMB2) 403 return NULL; 404 405 sess = kzalloc(sizeof(struct ksmbd_session), KSMBD_DEFAULT_GFP); 406 if (!sess) 407 return NULL; 408 409 if (ksmbd_init_file_table(&sess->file_table)) 410 goto error; 411 412 sess->last_active = jiffies; 413 sess->state = SMB2_SESSION_IN_PROGRESS; 414 set_session_flag(sess, protocol); 415 xa_init(&sess->tree_conns); 416 xa_init(&sess->ksmbd_chann_list); 417 xa_init(&sess->rpc_handle_list); 418 sess->sequence_number = 1; 419 rwlock_init(&sess->tree_conns_lock); 420 atomic_set(&sess->refcnt, 1); 421 422 ret = __init_smb2_session(sess); 423 if (ret) 424 goto error; 425 426 ida_init(&sess->tree_conn_ida); 427 428 down_write(&sessions_table_lock); 429 hash_add(sessions_table, &sess->hlist, sess->id); 430 up_write(&sessions_table_lock); 431 432 return sess; 433 434 error: 435 ksmbd_session_destroy(sess); 436 return NULL; 437 } 438 439 struct ksmbd_session *ksmbd_smb2_session_create(void) 440 { 441 return __session_create(CIFDS_SESSION_FLAG_SMB2); 442 } 443 444 int ksmbd_acquire_tree_conn_id(struct ksmbd_session *sess) 445 { 446 int id = -EINVAL; 447 448 if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2)) 449 id = ksmbd_acquire_smb2_tid(&sess->tree_conn_ida); 450 451 return id; 452 } 453 454 void ksmbd_release_tree_conn_id(struct ksmbd_session *sess, int id) 455 { 456 if (id >= 0) 457 ksmbd_release_id(&sess->tree_conn_ida, id); 458 } 459