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 up_read(&conn->session_lock); 268 return sess; 269 } 270 271 struct ksmbd_session *ksmbd_session_lookup_slowpath(unsigned long long id) 272 { 273 struct ksmbd_session *sess; 274 275 down_read(&sessions_table_lock); 276 sess = __session_lookup(id); 277 up_read(&sessions_table_lock); 278 279 return sess; 280 } 281 282 struct ksmbd_session *ksmbd_session_lookup_all(struct ksmbd_conn *conn, 283 unsigned long long id) 284 { 285 struct ksmbd_session *sess; 286 287 sess = ksmbd_session_lookup(conn, id); 288 if (!sess && conn->binding) 289 sess = ksmbd_session_lookup_slowpath(id); 290 if (sess && sess->state != SMB2_SESSION_VALID) 291 sess = NULL; 292 return sess; 293 } 294 295 void ksmbd_user_session_get(struct ksmbd_session *sess) 296 { 297 atomic_inc(&sess->refcnt); 298 } 299 300 void ksmbd_user_session_put(struct ksmbd_session *sess) 301 { 302 if (!sess) 303 return; 304 305 if (atomic_read(&sess->refcnt) <= 0) 306 WARN_ON(1); 307 else 308 atomic_dec(&sess->refcnt); 309 } 310 311 struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn, 312 u64 sess_id) 313 { 314 struct preauth_session *sess; 315 316 sess = kmalloc(sizeof(struct preauth_session), GFP_KERNEL); 317 if (!sess) 318 return NULL; 319 320 sess->id = sess_id; 321 memcpy(sess->Preauth_HashValue, conn->preauth_info->Preauth_HashValue, 322 PREAUTH_HASHVALUE_SIZE); 323 list_add(&sess->preauth_entry, &conn->preauth_sess_table); 324 325 return sess; 326 } 327 328 void destroy_previous_session(struct ksmbd_conn *conn, 329 struct ksmbd_user *user, u64 id) 330 { 331 struct ksmbd_session *prev_sess; 332 struct ksmbd_user *prev_user; 333 int err; 334 335 down_write(&sessions_table_lock); 336 down_write(&conn->session_lock); 337 prev_sess = __session_lookup(id); 338 if (!prev_sess || prev_sess->state == SMB2_SESSION_EXPIRED) 339 goto out; 340 341 prev_user = prev_sess->user; 342 if (!prev_user || 343 strcmp(user->name, prev_user->name) || 344 user->passkey_sz != prev_user->passkey_sz || 345 memcmp(user->passkey, prev_user->passkey, user->passkey_sz)) 346 goto out; 347 348 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_RECONNECT); 349 err = ksmbd_conn_wait_idle_sess_id(conn, id); 350 if (err) { 351 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_NEGOTIATE); 352 goto out; 353 } 354 ksmbd_destroy_file_table(&prev_sess->file_table); 355 prev_sess->state = SMB2_SESSION_EXPIRED; 356 ksmbd_all_conn_set_status(id, KSMBD_SESS_NEED_NEGOTIATE); 357 out: 358 up_write(&conn->session_lock); 359 up_write(&sessions_table_lock); 360 } 361 362 static bool ksmbd_preauth_session_id_match(struct preauth_session *sess, 363 unsigned long long id) 364 { 365 return sess->id == id; 366 } 367 368 struct preauth_session *ksmbd_preauth_session_lookup(struct ksmbd_conn *conn, 369 unsigned long long id) 370 { 371 struct preauth_session *sess = NULL; 372 373 list_for_each_entry(sess, &conn->preauth_sess_table, preauth_entry) { 374 if (ksmbd_preauth_session_id_match(sess, id)) 375 return sess; 376 } 377 return NULL; 378 } 379 380 static int __init_smb2_session(struct ksmbd_session *sess) 381 { 382 int id = ksmbd_acquire_smb2_uid(&session_ida); 383 384 if (id < 0) 385 return -EINVAL; 386 sess->id = id; 387 return 0; 388 } 389 390 static struct ksmbd_session *__session_create(int protocol) 391 { 392 struct ksmbd_session *sess; 393 int ret; 394 395 if (protocol != CIFDS_SESSION_FLAG_SMB2) 396 return NULL; 397 398 sess = kzalloc(sizeof(struct ksmbd_session), GFP_KERNEL); 399 if (!sess) 400 return NULL; 401 402 if (ksmbd_init_file_table(&sess->file_table)) 403 goto error; 404 405 sess->last_active = jiffies; 406 sess->state = SMB2_SESSION_IN_PROGRESS; 407 set_session_flag(sess, protocol); 408 xa_init(&sess->tree_conns); 409 xa_init(&sess->ksmbd_chann_list); 410 xa_init(&sess->rpc_handle_list); 411 sess->sequence_number = 1; 412 rwlock_init(&sess->tree_conns_lock); 413 atomic_set(&sess->refcnt, 1); 414 415 ret = __init_smb2_session(sess); 416 if (ret) 417 goto error; 418 419 ida_init(&sess->tree_conn_ida); 420 421 down_write(&sessions_table_lock); 422 hash_add(sessions_table, &sess->hlist, sess->id); 423 up_write(&sessions_table_lock); 424 425 return sess; 426 427 error: 428 ksmbd_session_destroy(sess); 429 return NULL; 430 } 431 432 struct ksmbd_session *ksmbd_smb2_session_create(void) 433 { 434 return __session_create(CIFDS_SESSION_FLAG_SMB2); 435 } 436 437 int ksmbd_acquire_tree_conn_id(struct ksmbd_session *sess) 438 { 439 int id = -EINVAL; 440 441 if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2)) 442 id = ksmbd_acquire_smb2_tid(&sess->tree_conn_ida); 443 444 return id; 445 } 446 447 void ksmbd_release_tree_conn_id(struct ksmbd_session *sess, int id) 448 { 449 if (id >= 0) 450 ksmbd_release_id(&sess->tree_conn_ida, id); 451 } 452