1 /******************************************************************************* 2 * This file contains main functions related to iSCSI Parameter negotiation. 3 * 4 * (c) Copyright 2007-2013 Datera, Inc. 5 * 6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 ******************************************************************************/ 18 19 #include <linux/ctype.h> 20 #include <scsi/iscsi_proto.h> 21 #include <target/target_core_base.h> 22 #include <target/target_core_fabric.h> 23 #include <target/iscsi/iscsi_transport.h> 24 25 #include "iscsi_target_core.h" 26 #include "iscsi_target_parameters.h" 27 #include "iscsi_target_login.h" 28 #include "iscsi_target_nego.h" 29 #include "iscsi_target_tpg.h" 30 #include "iscsi_target_util.h" 31 #include "iscsi_target.h" 32 #include "iscsi_target_auth.h" 33 34 #define MAX_LOGIN_PDUS 7 35 #define TEXT_LEN 4096 36 37 void convert_null_to_semi(char *buf, int len) 38 { 39 int i; 40 41 for (i = 0; i < len; i++) 42 if (buf[i] == '\0') 43 buf[i] = ';'; 44 } 45 46 static int strlen_semi(char *buf) 47 { 48 int i = 0; 49 50 while (buf[i] != '\0') { 51 if (buf[i] == ';') 52 return i; 53 i++; 54 } 55 56 return -1; 57 } 58 59 int extract_param( 60 const char *in_buf, 61 const char *pattern, 62 unsigned int max_length, 63 char *out_buf, 64 unsigned char *type) 65 { 66 char *ptr; 67 int len; 68 69 if (!in_buf || !pattern || !out_buf || !type) 70 return -1; 71 72 ptr = strstr(in_buf, pattern); 73 if (!ptr) 74 return -1; 75 76 ptr = strstr(ptr, "="); 77 if (!ptr) 78 return -1; 79 80 ptr += 1; 81 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) { 82 ptr += 2; /* skip 0x */ 83 *type = HEX; 84 } else 85 *type = DECIMAL; 86 87 len = strlen_semi(ptr); 88 if (len < 0) 89 return -1; 90 91 if (len >= max_length) { 92 pr_err("Length of input: %d exceeds max_length:" 93 " %d\n", len, max_length); 94 return -1; 95 } 96 memcpy(out_buf, ptr, len); 97 out_buf[len] = '\0'; 98 99 return 0; 100 } 101 102 static u32 iscsi_handle_authentication( 103 struct iscsi_conn *conn, 104 char *in_buf, 105 char *out_buf, 106 int in_length, 107 int *out_length, 108 unsigned char *authtype) 109 { 110 struct iscsi_session *sess = conn->sess; 111 struct iscsi_node_auth *auth; 112 struct iscsi_node_acl *iscsi_nacl; 113 struct iscsi_portal_group *iscsi_tpg; 114 struct se_node_acl *se_nacl; 115 116 if (!sess->sess_ops->SessionType) { 117 /* 118 * For SessionType=Normal 119 */ 120 se_nacl = conn->sess->se_sess->se_node_acl; 121 if (!se_nacl) { 122 pr_err("Unable to locate struct se_node_acl for" 123 " CHAP auth\n"); 124 return -1; 125 } 126 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl, 127 se_node_acl); 128 if (!iscsi_nacl) { 129 pr_err("Unable to locate struct iscsi_node_acl for" 130 " CHAP auth\n"); 131 return -1; 132 } 133 134 if (se_nacl->dynamic_node_acl) { 135 iscsi_tpg = container_of(se_nacl->se_tpg, 136 struct iscsi_portal_group, tpg_se_tpg); 137 138 auth = &iscsi_tpg->tpg_demo_auth; 139 } else { 140 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl, 141 se_node_acl); 142 143 auth = &iscsi_nacl->node_auth; 144 } 145 } else { 146 /* 147 * For SessionType=Discovery 148 */ 149 auth = &iscsit_global->discovery_acl.node_auth; 150 } 151 152 if (strstr("CHAP", authtype)) 153 strcpy(conn->sess->auth_type, "CHAP"); 154 else 155 strcpy(conn->sess->auth_type, NONE); 156 157 if (strstr("None", authtype)) 158 return 1; 159 #ifdef CANSRP 160 else if (strstr("SRP", authtype)) 161 return srp_main_loop(conn, auth, in_buf, out_buf, 162 &in_length, out_length); 163 #endif 164 else if (strstr("CHAP", authtype)) 165 return chap_main_loop(conn, auth, in_buf, out_buf, 166 &in_length, out_length); 167 else if (strstr("SPKM1", authtype)) 168 return 2; 169 else if (strstr("SPKM2", authtype)) 170 return 2; 171 else if (strstr("KRB5", authtype)) 172 return 2; 173 else 174 return 2; 175 } 176 177 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn) 178 { 179 kfree(conn->auth_protocol); 180 } 181 182 int iscsi_target_check_login_request( 183 struct iscsi_conn *conn, 184 struct iscsi_login *login) 185 { 186 int req_csg, req_nsg; 187 u32 payload_length; 188 struct iscsi_login_req *login_req; 189 190 login_req = (struct iscsi_login_req *) login->req; 191 payload_length = ntoh24(login_req->dlength); 192 193 switch (login_req->opcode & ISCSI_OPCODE_MASK) { 194 case ISCSI_OP_LOGIN: 195 break; 196 default: 197 pr_err("Received unknown opcode 0x%02x.\n", 198 login_req->opcode & ISCSI_OPCODE_MASK); 199 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 200 ISCSI_LOGIN_STATUS_INIT_ERR); 201 return -1; 202 } 203 204 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) && 205 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 206 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE" 207 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n"); 208 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 209 ISCSI_LOGIN_STATUS_INIT_ERR); 210 return -1; 211 } 212 213 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags); 214 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags); 215 216 if (req_csg != login->current_stage) { 217 pr_err("Initiator unexpectedly changed login stage" 218 " from %d to %d, login failed.\n", login->current_stage, 219 req_csg); 220 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 221 ISCSI_LOGIN_STATUS_INIT_ERR); 222 return -1; 223 } 224 225 if ((req_nsg == 2) || (req_csg >= 2) || 226 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) && 227 (req_nsg <= req_csg))) { 228 pr_err("Illegal login_req->flags Combination, CSG: %d," 229 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg, 230 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)); 231 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 232 ISCSI_LOGIN_STATUS_INIT_ERR); 233 return -1; 234 } 235 236 if ((login_req->max_version != login->version_max) || 237 (login_req->min_version != login->version_min)) { 238 pr_err("Login request changed Version Max/Nin" 239 " unexpectedly to 0x%02x/0x%02x, protocol error\n", 240 login_req->max_version, login_req->min_version); 241 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 242 ISCSI_LOGIN_STATUS_INIT_ERR); 243 return -1; 244 } 245 246 if (memcmp(login_req->isid, login->isid, 6) != 0) { 247 pr_err("Login request changed ISID unexpectedly," 248 " protocol error.\n"); 249 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 250 ISCSI_LOGIN_STATUS_INIT_ERR); 251 return -1; 252 } 253 254 if (login_req->itt != login->init_task_tag) { 255 pr_err("Login request changed ITT unexpectedly to" 256 " 0x%08x, protocol error.\n", login_req->itt); 257 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 258 ISCSI_LOGIN_STATUS_INIT_ERR); 259 return -1; 260 } 261 262 if (payload_length > MAX_KEY_VALUE_PAIRS) { 263 pr_err("Login request payload exceeds default" 264 " MaxRecvDataSegmentLength: %u, protocol error.\n", 265 MAX_KEY_VALUE_PAIRS); 266 return -1; 267 } 268 269 return 0; 270 } 271 272 static int iscsi_target_check_first_request( 273 struct iscsi_conn *conn, 274 struct iscsi_login *login) 275 { 276 struct iscsi_param *param = NULL; 277 struct se_node_acl *se_nacl; 278 279 login->first_request = 0; 280 281 list_for_each_entry(param, &conn->param_list->param_list, p_list) { 282 if (!strncmp(param->name, SESSIONTYPE, 11)) { 283 if (!IS_PSTATE_ACCEPTOR(param)) { 284 pr_err("SessionType key not received" 285 " in first login request.\n"); 286 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 287 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 288 return -1; 289 } 290 if (!strncmp(param->value, DISCOVERY, 9)) 291 return 0; 292 } 293 294 if (!strncmp(param->name, INITIATORNAME, 13)) { 295 if (!IS_PSTATE_ACCEPTOR(param)) { 296 if (!login->leading_connection) 297 continue; 298 299 pr_err("InitiatorName key not received" 300 " in first login request.\n"); 301 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 302 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 303 return -1; 304 } 305 306 /* 307 * For non-leading connections, double check that the 308 * received InitiatorName matches the existing session's 309 * struct iscsi_node_acl. 310 */ 311 if (!login->leading_connection) { 312 se_nacl = conn->sess->se_sess->se_node_acl; 313 if (!se_nacl) { 314 pr_err("Unable to locate" 315 " struct se_node_acl\n"); 316 iscsit_tx_login_rsp(conn, 317 ISCSI_STATUS_CLS_INITIATOR_ERR, 318 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 319 return -1; 320 } 321 322 if (strcmp(param->value, 323 se_nacl->initiatorname)) { 324 pr_err("Incorrect" 325 " InitiatorName: %s for this" 326 " iSCSI Initiator Node.\n", 327 param->value); 328 iscsit_tx_login_rsp(conn, 329 ISCSI_STATUS_CLS_INITIATOR_ERR, 330 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 331 return -1; 332 } 333 } 334 } 335 } 336 337 return 0; 338 } 339 340 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 341 { 342 u32 padding = 0; 343 struct iscsi_session *sess = conn->sess; 344 struct iscsi_login_rsp *login_rsp; 345 346 login_rsp = (struct iscsi_login_rsp *) login->rsp; 347 348 login_rsp->opcode = ISCSI_OP_LOGIN_RSP; 349 hton24(login_rsp->dlength, login->rsp_length); 350 memcpy(login_rsp->isid, login->isid, 6); 351 login_rsp->tsih = cpu_to_be16(login->tsih); 352 login_rsp->itt = login->init_task_tag; 353 login_rsp->statsn = cpu_to_be32(conn->stat_sn++); 354 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 355 login_rsp->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 356 357 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x," 358 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:" 359 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt, 360 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn), 361 ntohl(login_rsp->statsn), login->rsp_length); 362 363 padding = ((-login->rsp_length) & 3); 364 365 if (conn->conn_transport->iscsit_put_login_tx(conn, login, 366 login->rsp_length + padding) < 0) 367 return -1; 368 369 login->rsp_length = 0; 370 mutex_lock(&sess->cmdsn_mutex); 371 login_rsp->exp_cmdsn = cpu_to_be32(sess->exp_cmd_sn); 372 login_rsp->max_cmdsn = cpu_to_be32(sess->max_cmd_sn); 373 mutex_unlock(&sess->cmdsn_mutex); 374 375 return 0; 376 } 377 378 static void iscsi_target_sk_data_ready(struct sock *sk, int count) 379 { 380 struct iscsi_conn *conn = sk->sk_user_data; 381 bool rc; 382 383 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn); 384 385 write_lock_bh(&sk->sk_callback_lock); 386 if (!sk->sk_user_data) { 387 write_unlock_bh(&sk->sk_callback_lock); 388 return; 389 } 390 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 391 write_unlock_bh(&sk->sk_callback_lock); 392 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn); 393 return; 394 } 395 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 396 write_unlock_bh(&sk->sk_callback_lock); 397 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn); 398 return; 399 } 400 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) { 401 write_unlock_bh(&sk->sk_callback_lock); 402 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn); 403 return; 404 } 405 406 rc = schedule_delayed_work(&conn->login_work, 0); 407 if (rc == false) { 408 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work" 409 " got false\n"); 410 } 411 write_unlock_bh(&sk->sk_callback_lock); 412 } 413 414 static void iscsi_target_sk_state_change(struct sock *); 415 416 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn) 417 { 418 struct sock *sk; 419 420 if (!conn->sock) 421 return; 422 423 sk = conn->sock->sk; 424 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn); 425 426 write_lock_bh(&sk->sk_callback_lock); 427 sk->sk_user_data = conn; 428 conn->orig_data_ready = sk->sk_data_ready; 429 conn->orig_state_change = sk->sk_state_change; 430 sk->sk_data_ready = iscsi_target_sk_data_ready; 431 sk->sk_state_change = iscsi_target_sk_state_change; 432 write_unlock_bh(&sk->sk_callback_lock); 433 434 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ; 435 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ; 436 } 437 438 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn) 439 { 440 struct sock *sk; 441 442 if (!conn->sock) 443 return; 444 445 sk = conn->sock->sk; 446 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn); 447 448 write_lock_bh(&sk->sk_callback_lock); 449 if (!sk->sk_user_data) { 450 write_unlock_bh(&sk->sk_callback_lock); 451 return; 452 } 453 sk->sk_user_data = NULL; 454 sk->sk_data_ready = conn->orig_data_ready; 455 sk->sk_state_change = conn->orig_state_change; 456 write_unlock_bh(&sk->sk_callback_lock); 457 458 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 459 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 460 } 461 462 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *); 463 464 static bool iscsi_target_sk_state_check(struct sock *sk) 465 { 466 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) { 467 pr_debug("iscsi_target_sk_state_check: TCP_CLOSE_WAIT|TCP_CLOSE," 468 "returning FALSE\n"); 469 return false; 470 } 471 return true; 472 } 473 474 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login) 475 { 476 struct iscsi_np *np = login->np; 477 bool zero_tsih = login->zero_tsih; 478 479 iscsi_remove_failed_auth_entry(conn); 480 iscsi_target_nego_release(conn); 481 iscsi_target_login_sess_out(conn, np, zero_tsih, true); 482 } 483 484 static void iscsi_target_login_timeout(unsigned long data) 485 { 486 struct iscsi_conn *conn = (struct iscsi_conn *)data; 487 488 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n"); 489 490 if (conn->login_kworker) { 491 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n", 492 conn->login_kworker->comm, conn->login_kworker->pid); 493 send_sig(SIGINT, conn->login_kworker, 1); 494 } 495 } 496 497 static void iscsi_target_do_login_rx(struct work_struct *work) 498 { 499 struct iscsi_conn *conn = container_of(work, 500 struct iscsi_conn, login_work.work); 501 struct iscsi_login *login = conn->login; 502 struct iscsi_np *np = login->np; 503 struct iscsi_portal_group *tpg = conn->tpg; 504 struct iscsi_tpg_np *tpg_np = conn->tpg_np; 505 struct timer_list login_timer; 506 int rc, zero_tsih = login->zero_tsih; 507 bool state; 508 509 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n", 510 conn, current->comm, current->pid); 511 512 spin_lock(&tpg->tpg_state_lock); 513 state = (tpg->tpg_state == TPG_STATE_ACTIVE); 514 spin_unlock(&tpg->tpg_state_lock); 515 516 if (state == false) { 517 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n"); 518 iscsi_target_restore_sock_callbacks(conn); 519 iscsi_target_login_drop(conn, login); 520 iscsit_deaccess_np(np, tpg, tpg_np); 521 return; 522 } 523 524 if (conn->sock) { 525 struct sock *sk = conn->sock->sk; 526 527 read_lock_bh(&sk->sk_callback_lock); 528 state = iscsi_target_sk_state_check(sk); 529 read_unlock_bh(&sk->sk_callback_lock); 530 531 if (state == false) { 532 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n"); 533 iscsi_target_restore_sock_callbacks(conn); 534 iscsi_target_login_drop(conn, login); 535 iscsit_deaccess_np(np, tpg, tpg_np); 536 return; 537 } 538 } 539 540 conn->login_kworker = current; 541 allow_signal(SIGINT); 542 543 init_timer(&login_timer); 544 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ); 545 login_timer.data = (unsigned long)conn; 546 login_timer.function = iscsi_target_login_timeout; 547 add_timer(&login_timer); 548 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid); 549 550 rc = conn->conn_transport->iscsit_get_login_rx(conn, login); 551 del_timer_sync(&login_timer); 552 flush_signals(current); 553 conn->login_kworker = NULL; 554 555 if (rc < 0) { 556 iscsi_target_restore_sock_callbacks(conn); 557 iscsi_target_login_drop(conn, login); 558 iscsit_deaccess_np(np, tpg, tpg_np); 559 return; 560 } 561 562 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n", 563 conn, current->comm, current->pid); 564 565 rc = iscsi_target_do_login(conn, login); 566 if (rc < 0) { 567 iscsi_target_restore_sock_callbacks(conn); 568 iscsi_target_login_drop(conn, login); 569 iscsit_deaccess_np(np, tpg, tpg_np); 570 } else if (!rc) { 571 if (conn->sock) { 572 struct sock *sk = conn->sock->sk; 573 574 write_lock_bh(&sk->sk_callback_lock); 575 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags); 576 write_unlock_bh(&sk->sk_callback_lock); 577 } 578 } else if (rc == 1) { 579 iscsi_target_nego_release(conn); 580 iscsi_post_login_handler(np, conn, zero_tsih); 581 iscsit_deaccess_np(np, tpg, tpg_np); 582 } 583 } 584 585 static void iscsi_target_do_cleanup(struct work_struct *work) 586 { 587 struct iscsi_conn *conn = container_of(work, 588 struct iscsi_conn, login_cleanup_work.work); 589 struct sock *sk = conn->sock->sk; 590 struct iscsi_login *login = conn->login; 591 struct iscsi_np *np = login->np; 592 struct iscsi_portal_group *tpg = conn->tpg; 593 struct iscsi_tpg_np *tpg_np = conn->tpg_np; 594 595 pr_debug("Entering iscsi_target_do_cleanup\n"); 596 597 cancel_delayed_work_sync(&conn->login_work); 598 conn->orig_state_change(sk); 599 600 iscsi_target_restore_sock_callbacks(conn); 601 iscsi_target_login_drop(conn, login); 602 iscsit_deaccess_np(np, tpg, tpg_np); 603 604 pr_debug("iscsi_target_do_cleanup done()\n"); 605 } 606 607 static void iscsi_target_sk_state_change(struct sock *sk) 608 { 609 struct iscsi_conn *conn; 610 void (*orig_state_change)(struct sock *); 611 bool state; 612 613 pr_debug("Entering iscsi_target_sk_state_change\n"); 614 615 write_lock_bh(&sk->sk_callback_lock); 616 conn = sk->sk_user_data; 617 if (!conn) { 618 write_unlock_bh(&sk->sk_callback_lock); 619 return; 620 } 621 orig_state_change = conn->orig_state_change; 622 623 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 624 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n", 625 conn); 626 write_unlock_bh(&sk->sk_callback_lock); 627 orig_state_change(sk); 628 return; 629 } 630 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) { 631 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change" 632 " conn: %p\n", conn); 633 write_unlock_bh(&sk->sk_callback_lock); 634 orig_state_change(sk); 635 return; 636 } 637 if (test_and_set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 638 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n", 639 conn); 640 write_unlock_bh(&sk->sk_callback_lock); 641 orig_state_change(sk); 642 return; 643 } 644 645 state = iscsi_target_sk_state_check(sk); 646 write_unlock_bh(&sk->sk_callback_lock); 647 648 pr_debug("iscsi_target_sk_state_change: state: %d\n", state); 649 650 if (!state) { 651 pr_debug("iscsi_target_sk_state_change got failed state\n"); 652 schedule_delayed_work(&conn->login_cleanup_work, 0); 653 return; 654 } 655 orig_state_change(sk); 656 } 657 658 /* 659 * NOTE: We check for existing sessions or connections AFTER the initiator 660 * has been successfully authenticated in order to protect against faked 661 * ISID/TSIH combinations. 662 */ 663 static int iscsi_target_check_for_existing_instances( 664 struct iscsi_conn *conn, 665 struct iscsi_login *login) 666 { 667 if (login->checked_for_existing) 668 return 0; 669 670 login->checked_for_existing = 1; 671 672 if (!login->tsih) 673 return iscsi_check_for_session_reinstatement(conn); 674 else 675 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 676 login->initial_exp_statsn); 677 } 678 679 static int iscsi_target_do_authentication( 680 struct iscsi_conn *conn, 681 struct iscsi_login *login) 682 { 683 int authret; 684 u32 payload_length; 685 struct iscsi_param *param; 686 struct iscsi_login_req *login_req; 687 struct iscsi_login_rsp *login_rsp; 688 689 login_req = (struct iscsi_login_req *) login->req; 690 login_rsp = (struct iscsi_login_rsp *) login->rsp; 691 payload_length = ntoh24(login_req->dlength); 692 693 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 694 if (!param) 695 return -1; 696 697 authret = iscsi_handle_authentication( 698 conn, 699 login->req_buf, 700 login->rsp_buf, 701 payload_length, 702 &login->rsp_length, 703 param->value); 704 switch (authret) { 705 case 0: 706 pr_debug("Received OK response" 707 " from LIO Authentication, continuing.\n"); 708 break; 709 case 1: 710 pr_debug("iSCSI security negotiation" 711 " completed successfully.\n"); 712 login->auth_complete = 1; 713 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 714 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 715 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 716 ISCSI_FLAG_LOGIN_TRANSIT); 717 login->current_stage = 1; 718 } 719 return iscsi_target_check_for_existing_instances( 720 conn, login); 721 case 2: 722 pr_err("Security negotiation" 723 " failed.\n"); 724 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 725 ISCSI_LOGIN_STATUS_AUTH_FAILED); 726 return -1; 727 default: 728 pr_err("Received unknown error %d from LIO" 729 " Authentication\n", authret); 730 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 731 ISCSI_LOGIN_STATUS_TARGET_ERROR); 732 return -1; 733 } 734 735 return 0; 736 } 737 738 static int iscsi_target_handle_csg_zero( 739 struct iscsi_conn *conn, 740 struct iscsi_login *login) 741 { 742 int ret; 743 u32 payload_length; 744 struct iscsi_param *param; 745 struct iscsi_login_req *login_req; 746 struct iscsi_login_rsp *login_rsp; 747 748 login_req = (struct iscsi_login_req *) login->req; 749 login_rsp = (struct iscsi_login_rsp *) login->rsp; 750 payload_length = ntoh24(login_req->dlength); 751 752 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 753 if (!param) 754 return -1; 755 756 ret = iscsi_decode_text_input( 757 PHASE_SECURITY|PHASE_DECLARATIVE, 758 SENDER_INITIATOR|SENDER_RECEIVER, 759 login->req_buf, 760 payload_length, 761 conn); 762 if (ret < 0) 763 return -1; 764 765 if (ret > 0) { 766 if (login->auth_complete) { 767 pr_err("Initiator has already been" 768 " successfully authenticated, but is still" 769 " sending %s keys.\n", param->value); 770 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 771 ISCSI_LOGIN_STATUS_INIT_ERR); 772 return -1; 773 } 774 775 goto do_auth; 776 } 777 778 if (login->first_request) 779 if (iscsi_target_check_first_request(conn, login) < 0) 780 return -1; 781 782 ret = iscsi_encode_text_output( 783 PHASE_SECURITY|PHASE_DECLARATIVE, 784 SENDER_TARGET, 785 login->rsp_buf, 786 &login->rsp_length, 787 conn->param_list); 788 if (ret < 0) 789 return -1; 790 791 if (!iscsi_check_negotiated_keys(conn->param_list)) { 792 if (conn->tpg->tpg_attrib.authentication && 793 !strncmp(param->value, NONE, 4)) { 794 pr_err("Initiator sent AuthMethod=None but" 795 " Target is enforcing iSCSI Authentication," 796 " login failed.\n"); 797 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 798 ISCSI_LOGIN_STATUS_AUTH_FAILED); 799 return -1; 800 } 801 802 if (conn->tpg->tpg_attrib.authentication && 803 !login->auth_complete) 804 return 0; 805 806 if (strncmp(param->value, NONE, 4) && !login->auth_complete) 807 return 0; 808 809 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 810 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 811 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 812 ISCSI_FLAG_LOGIN_TRANSIT; 813 login->current_stage = 1; 814 } 815 } 816 817 return 0; 818 do_auth: 819 return iscsi_target_do_authentication(conn, login); 820 } 821 822 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login) 823 { 824 int ret; 825 u32 payload_length; 826 struct iscsi_login_req *login_req; 827 struct iscsi_login_rsp *login_rsp; 828 829 login_req = (struct iscsi_login_req *) login->req; 830 login_rsp = (struct iscsi_login_rsp *) login->rsp; 831 payload_length = ntoh24(login_req->dlength); 832 833 ret = iscsi_decode_text_input( 834 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 835 SENDER_INITIATOR|SENDER_RECEIVER, 836 login->req_buf, 837 payload_length, 838 conn); 839 if (ret < 0) { 840 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 841 ISCSI_LOGIN_STATUS_INIT_ERR); 842 return -1; 843 } 844 845 if (login->first_request) 846 if (iscsi_target_check_first_request(conn, login) < 0) 847 return -1; 848 849 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 850 return -1; 851 852 ret = iscsi_encode_text_output( 853 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 854 SENDER_TARGET, 855 login->rsp_buf, 856 &login->rsp_length, 857 conn->param_list); 858 if (ret < 0) { 859 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 860 ISCSI_LOGIN_STATUS_INIT_ERR); 861 return -1; 862 } 863 864 if (!login->auth_complete && 865 conn->tpg->tpg_attrib.authentication) { 866 pr_err("Initiator is requesting CSG: 1, has not been" 867 " successfully authenticated, and the Target is" 868 " enforcing iSCSI Authentication, login failed.\n"); 869 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 870 ISCSI_LOGIN_STATUS_AUTH_FAILED); 871 return -1; 872 } 873 874 if (!iscsi_check_negotiated_keys(conn->param_list)) 875 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 876 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 877 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 878 ISCSI_FLAG_LOGIN_TRANSIT; 879 880 return 0; 881 } 882 883 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login) 884 { 885 int pdu_count = 0; 886 struct iscsi_login_req *login_req; 887 struct iscsi_login_rsp *login_rsp; 888 889 login_req = (struct iscsi_login_req *) login->req; 890 login_rsp = (struct iscsi_login_rsp *) login->rsp; 891 892 while (1) { 893 if (++pdu_count > MAX_LOGIN_PDUS) { 894 pr_err("MAX_LOGIN_PDUS count reached.\n"); 895 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 896 ISCSI_LOGIN_STATUS_TARGET_ERROR); 897 return -1; 898 } 899 900 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) { 901 case 0: 902 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK; 903 if (iscsi_target_handle_csg_zero(conn, login) < 0) 904 return -1; 905 break; 906 case 1: 907 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 908 if (iscsi_target_handle_csg_one(conn, login) < 0) 909 return -1; 910 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 911 login->tsih = conn->sess->tsih; 912 login->login_complete = 1; 913 iscsi_target_restore_sock_callbacks(conn); 914 if (iscsi_target_do_tx_login_io(conn, 915 login) < 0) 916 return -1; 917 return 1; 918 } 919 break; 920 default: 921 pr_err("Illegal CSG: %d received from" 922 " Initiator, protocol error.\n", 923 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)); 924 break; 925 } 926 927 if (iscsi_target_do_tx_login_io(conn, login) < 0) 928 return -1; 929 930 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 931 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 932 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 933 } 934 break; 935 } 936 937 if (conn->sock) { 938 struct sock *sk = conn->sock->sk; 939 bool state; 940 941 read_lock_bh(&sk->sk_callback_lock); 942 state = iscsi_target_sk_state_check(sk); 943 read_unlock_bh(&sk->sk_callback_lock); 944 945 if (!state) { 946 pr_debug("iscsi_target_do_login() failed state for" 947 " conn: %p\n", conn); 948 return -1; 949 } 950 } 951 952 return 0; 953 } 954 955 static void iscsi_initiatorname_tolower( 956 char *param_buf) 957 { 958 char *c; 959 u32 iqn_size = strlen(param_buf), i; 960 961 for (i = 0; i < iqn_size; i++) { 962 c = ¶m_buf[i]; 963 if (!isupper(*c)) 964 continue; 965 966 *c = tolower(*c); 967 } 968 } 969 970 /* 971 * Processes the first Login Request.. 972 */ 973 int iscsi_target_locate_portal( 974 struct iscsi_np *np, 975 struct iscsi_conn *conn, 976 struct iscsi_login *login) 977 { 978 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 979 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 980 struct iscsi_session *sess = conn->sess; 981 struct iscsi_tiqn *tiqn; 982 struct iscsi_tpg_np *tpg_np = NULL; 983 struct iscsi_login_req *login_req; 984 struct se_node_acl *se_nacl; 985 u32 payload_length, queue_depth = 0; 986 int sessiontype = 0, ret = 0, tag_num, tag_size; 987 988 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx); 989 INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup); 990 iscsi_target_set_sock_callbacks(conn); 991 992 login->np = np; 993 994 login_req = (struct iscsi_login_req *) login->req; 995 payload_length = ntoh24(login_req->dlength); 996 997 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL); 998 if (!tmpbuf) { 999 pr_err("Unable to allocate memory for tmpbuf.\n"); 1000 return -1; 1001 } 1002 1003 memcpy(tmpbuf, login->req_buf, payload_length); 1004 tmpbuf[payload_length] = '\0'; 1005 start = tmpbuf; 1006 end = (start + payload_length); 1007 1008 /* 1009 * Locate the initial keys expected from the Initiator node in 1010 * the first login request in order to progress with the login phase. 1011 */ 1012 while (start < end) { 1013 if (iscsi_extract_key_value(start, &key, &value) < 0) { 1014 ret = -1; 1015 goto out; 1016 } 1017 1018 if (!strncmp(key, "InitiatorName", 13)) 1019 i_buf = value; 1020 else if (!strncmp(key, "SessionType", 11)) 1021 s_buf = value; 1022 else if (!strncmp(key, "TargetName", 10)) 1023 t_buf = value; 1024 1025 start += strlen(key) + strlen(value) + 2; 1026 } 1027 /* 1028 * See 5.3. Login Phase. 1029 */ 1030 if (!i_buf) { 1031 pr_err("InitiatorName key not received" 1032 " in first login request.\n"); 1033 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1034 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1035 ret = -1; 1036 goto out; 1037 } 1038 /* 1039 * Convert the incoming InitiatorName to lowercase following 1040 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 1041 * are NOT case sensitive. 1042 */ 1043 iscsi_initiatorname_tolower(i_buf); 1044 1045 if (!s_buf) { 1046 if (!login->leading_connection) 1047 goto get_target; 1048 1049 pr_err("SessionType key not received" 1050 " in first login request.\n"); 1051 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1052 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1053 ret = -1; 1054 goto out; 1055 } 1056 1057 /* 1058 * Use default portal group for discovery sessions. 1059 */ 1060 sessiontype = strncmp(s_buf, DISCOVERY, 9); 1061 if (!sessiontype) { 1062 conn->tpg = iscsit_global->discovery_tpg; 1063 if (!login->leading_connection) 1064 goto get_target; 1065 1066 sess->sess_ops->SessionType = 1; 1067 /* 1068 * Setup crc32c modules from libcrypto 1069 */ 1070 if (iscsi_login_setup_crypto(conn) < 0) { 1071 pr_err("iscsi_login_setup_crypto() failed\n"); 1072 ret = -1; 1073 goto out; 1074 } 1075 /* 1076 * Serialize access across the discovery struct iscsi_portal_group to 1077 * process login attempt. 1078 */ 1079 if (iscsit_access_np(np, conn->tpg) < 0) { 1080 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1081 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1082 ret = -1; 1083 goto out; 1084 } 1085 ret = 0; 1086 goto alloc_tags; 1087 } 1088 1089 get_target: 1090 if (!t_buf) { 1091 pr_err("TargetName key not received" 1092 " in first login request while" 1093 " SessionType=Normal.\n"); 1094 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1095 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1096 ret = -1; 1097 goto out; 1098 } 1099 1100 /* 1101 * Locate Target IQN from Storage Node. 1102 */ 1103 tiqn = iscsit_get_tiqn_for_login(t_buf); 1104 if (!tiqn) { 1105 pr_err("Unable to locate Target IQN: %s in" 1106 " Storage Node\n", t_buf); 1107 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1108 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1109 ret = -1; 1110 goto out; 1111 } 1112 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 1113 1114 /* 1115 * Locate Target Portal Group from Storage Node. 1116 */ 1117 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np); 1118 if (!conn->tpg) { 1119 pr_err("Unable to locate Target Portal Group" 1120 " on %s\n", tiqn->tiqn); 1121 iscsit_put_tiqn_for_login(tiqn); 1122 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1123 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1124 ret = -1; 1125 goto out; 1126 } 1127 conn->tpg_np = tpg_np; 1128 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 1129 /* 1130 * Setup crc32c modules from libcrypto 1131 */ 1132 if (iscsi_login_setup_crypto(conn) < 0) { 1133 pr_err("iscsi_login_setup_crypto() failed\n"); 1134 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1135 iscsit_put_tiqn_for_login(tiqn); 1136 conn->tpg = NULL; 1137 ret = -1; 1138 goto out; 1139 } 1140 /* 1141 * Serialize access across the struct iscsi_portal_group to 1142 * process login attempt. 1143 */ 1144 if (iscsit_access_np(np, conn->tpg) < 0) { 1145 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1146 iscsit_put_tiqn_for_login(tiqn); 1147 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1148 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1149 conn->tpg = NULL; 1150 ret = -1; 1151 goto out; 1152 } 1153 1154 /* 1155 * conn->sess->node_acl will be set when the referenced 1156 * struct iscsi_session is located from received ISID+TSIH in 1157 * iscsi_login_non_zero_tsih_s2(). 1158 */ 1159 if (!login->leading_connection) { 1160 ret = 0; 1161 goto out; 1162 } 1163 1164 /* 1165 * This value is required in iscsi_login_zero_tsih_s2() 1166 */ 1167 sess->sess_ops->SessionType = 0; 1168 1169 /* 1170 * Locate incoming Initiator IQN reference from Storage Node. 1171 */ 1172 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1173 &conn->tpg->tpg_se_tpg, i_buf); 1174 if (!sess->se_sess->se_node_acl) { 1175 pr_err("iSCSI Initiator Node: %s is not authorized to" 1176 " access iSCSI target portal group: %hu.\n", 1177 i_buf, conn->tpg->tpgt); 1178 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1179 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 1180 ret = -1; 1181 goto out; 1182 } 1183 se_nacl = sess->se_sess->se_node_acl; 1184 queue_depth = se_nacl->queue_depth; 1185 /* 1186 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN 1187 * depth for non immediate commands, plus extra tags for immediate 1188 * commands. 1189 * 1190 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention 1191 * in per-cpu-ida tag allocation logic + small queue_depth. 1192 */ 1193 alloc_tags: 1194 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth); 1195 tag_num += (tag_num / 2) + ISCSIT_EXTRA_TAGS; 1196 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; 1197 1198 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size); 1199 if (ret < 0) { 1200 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1201 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1202 ret = -1; 1203 } 1204 out: 1205 kfree(tmpbuf); 1206 return ret; 1207 } 1208 1209 int iscsi_target_start_negotiation( 1210 struct iscsi_login *login, 1211 struct iscsi_conn *conn) 1212 { 1213 int ret; 1214 1215 ret = iscsi_target_do_login(conn, login); 1216 if (!ret) { 1217 if (conn->sock) { 1218 struct sock *sk = conn->sock->sk; 1219 1220 write_lock_bh(&sk->sk_callback_lock); 1221 set_bit(LOGIN_FLAGS_READY, &conn->login_flags); 1222 write_unlock_bh(&sk->sk_callback_lock); 1223 } 1224 } else if (ret < 0) { 1225 cancel_delayed_work_sync(&conn->login_work); 1226 cancel_delayed_work_sync(&conn->login_cleanup_work); 1227 iscsi_target_restore_sock_callbacks(conn); 1228 iscsi_remove_failed_auth_entry(conn); 1229 } 1230 if (ret != 0) 1231 iscsi_target_nego_release(conn); 1232 1233 return ret; 1234 } 1235 1236 void iscsi_target_nego_release(struct iscsi_conn *conn) 1237 { 1238 struct iscsi_login *login = conn->conn_login; 1239 1240 if (!login) 1241 return; 1242 1243 kfree(login->req_buf); 1244 kfree(login->rsp_buf); 1245 kfree(login); 1246 1247 conn->conn_login = NULL; 1248 } 1249