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