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