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), GFP_KERNEL); 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, GFP_KERNEL); 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, GFP_KERNEL)); 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 up_read(&conn->session_lock); 269 return sess; 270 } 271 272 struct ksmbd_session *ksmbd_session_lookup_slowpath(unsigned long long id) 273 { 274 struct ksmbd_session *sess; 275 276 down_read(&sessions_table_lock); 277 sess = __session_lookup(id); 278 up_read(&sessions_table_lock); 279 280 return sess; 281 } 282 283 struct ksmbd_session *ksmbd_session_lookup_all(struct ksmbd_conn *conn, 284 unsigned long long id) 285 { 286 struct ksmbd_session *sess; 287 288 sess = ksmbd_session_lookup(conn, id); 289 if (!sess && conn->binding) 290 sess = ksmbd_session_lookup_slowpath(id); 291 if (sess && sess->state != SMB2_SESSION_VALID) 292 sess = NULL; 293 return sess; 294 } 295 296 void ksmbd_user_session_get(struct ksmbd_session *sess) 297 { 298 atomic_inc(&sess->refcnt); 299 } 300 301 void ksmbd_user_session_put(struct ksmbd_session *sess) 302 { 303 if (!sess) 304 return; 305 306 if (atomic_read(&sess->refcnt) <= 0) 307 WARN_ON(1); 308 else 309 atomic_dec(&sess->refcnt); 310 } 311 312 struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn, 313 u64 sess_id) 314 { 315 struct preauth_session *sess; 316 317 sess = kmalloc(sizeof(struct preauth_session), GFP_KERNEL); 318 if (!sess) 319 return NULL; 320 321 sess->id = sess_id; 322 memcpy(sess->Preauth_HashValue, conn->preauth_info->Preauth_HashValue, 323 PREAUTH_HASHVALUE_SIZE); 324 list_add(&sess->preauth_entry, &conn->preauth_sess_table); 325 326 return sess; 327 } 328 329 void destroy_previous_session(struct ksmbd_conn *conn, 330 struct ksmbd_user *user, u64 id) 331 { 332 struct ksmbd_session *prev_sess; 333 struct ksmbd_user *prev_user; 334 int err; 335 336 down_write(&sessions_table_lock); 337 down_write(&conn->session_lock); 338 prev_sess = __session_lookup(id); 339 if (!prev_sess || prev_sess->state == SMB2_SESSION_EXPIRED) 340 goto out; 341 342 prev_user = prev_sess->user; 343 if (!prev_user || 344 strcmp(user->name, prev_user->name) || 345 user->passkey_sz != prev_user->passkey_sz || 346 memcmp(user->passkey, prev_user->passkey, user->passkey_sz)) 347 goto out; 348 349 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_RECONNECT); 350 err = ksmbd_conn_wait_idle_sess_id(conn, id); 351 if (err) { 352 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_NEGOTIATE); 353 goto out; 354 } 355 356 ksmbd_destroy_file_table(&prev_sess->file_table); 357 prev_sess->state = SMB2_SESSION_EXPIRED; 358 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_NEGOTIATE); 359 ksmbd_launch_ksmbd_durable_scavenger(); 360 out: 361 up_write(&conn->session_lock); 362 up_write(&sessions_table_lock); 363 } 364 365 static bool ksmbd_preauth_session_id_match(struct preauth_session *sess, 366 unsigned long long id) 367 { 368 return sess->id == id; 369 } 370 371 struct preauth_session *ksmbd_preauth_session_lookup(struct ksmbd_conn *conn, 372 unsigned long long id) 373 { 374 struct preauth_session *sess = NULL; 375 376 list_for_each_entry(sess, &conn->preauth_sess_table, preauth_entry) { 377 if (ksmbd_preauth_session_id_match(sess, id)) 378 return sess; 379 } 380 return NULL; 381 } 382 383 static int __init_smb2_session(struct ksmbd_session *sess) 384 { 385 int id = ksmbd_acquire_smb2_uid(&session_ida); 386 387 if (id < 0) 388 return -EINVAL; 389 sess->id = id; 390 return 0; 391 } 392 393 static struct ksmbd_session *__session_create(int protocol) 394 { 395 struct ksmbd_session *sess; 396 int ret; 397 398 if (protocol != CIFDS_SESSION_FLAG_SMB2) 399 return NULL; 400 401 sess = kzalloc(sizeof(struct ksmbd_session), GFP_KERNEL); 402 if (!sess) 403 return NULL; 404 405 if (ksmbd_init_file_table(&sess->file_table)) 406 goto error; 407 408 sess->last_active = jiffies; 409 sess->state = SMB2_SESSION_IN_PROGRESS; 410 set_session_flag(sess, protocol); 411 xa_init(&sess->tree_conns); 412 xa_init(&sess->ksmbd_chann_list); 413 xa_init(&sess->rpc_handle_list); 414 sess->sequence_number = 1; 415 rwlock_init(&sess->tree_conns_lock); 416 atomic_set(&sess->refcnt, 1); 417 418 ret = __init_smb2_session(sess); 419 if (ret) 420 goto error; 421 422 ida_init(&sess->tree_conn_ida); 423 424 down_write(&sessions_table_lock); 425 hash_add(sessions_table, &sess->hlist, sess->id); 426 up_write(&sessions_table_lock); 427 428 return sess; 429 430 error: 431 ksmbd_session_destroy(sess); 432 return NULL; 433 } 434 435 struct ksmbd_session *ksmbd_smb2_session_create(void) 436 { 437 return __session_create(CIFDS_SESSION_FLAG_SMB2); 438 } 439 440 int ksmbd_acquire_tree_conn_id(struct ksmbd_session *sess) 441 { 442 int id = -EINVAL; 443 444 if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2)) 445 id = ksmbd_acquire_smb2_tid(&sess->tree_conn_ida); 446 447 return id; 448 } 449 450 void ksmbd_release_tree_conn_id(struct ksmbd_session *sess, int id) 451 { 452 if (id >= 0) 453 ksmbd_release_id(&sess->tree_conn_ida, id); 454 } 455