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