1/******************************************************************************* 2 * This file contains main functions related to iSCSI Parameter negotiation. 3 * 4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. 5 * 6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2. 7 * 8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 ******************************************************************************/ 20 21#include <linux/ctype.h> 22#include <scsi/iscsi_proto.h> 23#include <target/target_core_base.h> 24#include <target/target_core_fabric.h> 25 26#include "iscsi_target_core.h" 27#include "iscsi_target_parameters.h" 28#include "iscsi_target_login.h" 29#include "iscsi_target_nego.h" 30#include "iscsi_target_tpg.h" 31#include "iscsi_target_util.h" 32#include "iscsi_target.h" 33#include "iscsi_target_auth.h" 34 35#define MAX_LOGIN_PDUS 7 36#define TEXT_LEN 4096 37 38void convert_null_to_semi(char *buf, int len) 39{ 40 int i; 41 42 for (i = 0; i < len; i++) 43 if (buf[i] == '\0') 44 buf[i] = ';'; 45} 46 47int strlen_semi(char *buf) 48{ 49 int i = 0; 50 51 while (buf[i] != '\0') { 52 if (buf[i] == ';') 53 return i; 54 i++; 55 } 56 57 return -1; 58} 59 60int extract_param( 61 const char *in_buf, 62 const char *pattern, 63 unsigned int max_length, 64 char *out_buf, 65 unsigned char *type) 66{ 67 char *ptr; 68 int len; 69 70 if (!in_buf || !pattern || !out_buf || !type) 71 return -1; 72 73 ptr = strstr(in_buf, pattern); 74 if (!ptr) 75 return -1; 76 77 ptr = strstr(ptr, "="); 78 if (!ptr) 79 return -1; 80 81 ptr += 1; 82 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) { 83 ptr += 2; /* skip 0x */ 84 *type = HEX; 85 } else 86 *type = DECIMAL; 87 88 len = strlen_semi(ptr); 89 if (len < 0) 90 return -1; 91 92 if (len > max_length) { 93 pr_err("Length of input: %d exceeds max_length:" 94 " %d\n", len, max_length); 95 return -1; 96 } 97 memcpy(out_buf, ptr, len); 98 out_buf[len] = '\0'; 99 100 return 0; 101} 102 103static u32 iscsi_handle_authentication( 104 struct iscsi_conn *conn, 105 char *in_buf, 106 char *out_buf, 107 int in_length, 108 int *out_length, 109 unsigned char *authtype) 110{ 111 struct iscsi_session *sess = conn->sess; 112 struct iscsi_node_auth *auth; 113 struct iscsi_node_acl *iscsi_nacl; 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 auth = ISCSI_NODE_AUTH(iscsi_nacl); 135 } else { 136 /* 137 * For SessionType=Discovery 138 */ 139 auth = &iscsit_global->discovery_acl.node_auth; 140 } 141 142 if (strstr("CHAP", authtype)) 143 strcpy(conn->sess->auth_type, "CHAP"); 144 else 145 strcpy(conn->sess->auth_type, NONE); 146 147 if (strstr("None", authtype)) 148 return 1; 149#ifdef CANSRP 150 else if (strstr("SRP", authtype)) 151 return srp_main_loop(conn, auth, in_buf, out_buf, 152 &in_length, out_length); 153#endif 154 else if (strstr("CHAP", authtype)) 155 return chap_main_loop(conn, auth, in_buf, out_buf, 156 &in_length, out_length); 157 else if (strstr("SPKM1", authtype)) 158 return 2; 159 else if (strstr("SPKM2", authtype)) 160 return 2; 161 else if (strstr("KRB5", authtype)) 162 return 2; 163 else 164 return 2; 165} 166 167static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn) 168{ 169 kfree(conn->auth_protocol); 170} 171 172static int iscsi_target_check_login_request( 173 struct iscsi_conn *conn, 174 struct iscsi_login *login) 175{ 176 int req_csg, req_nsg; 177 u32 payload_length; 178 struct iscsi_login_req *login_req; 179 180 login_req = (struct iscsi_login_req *) login->req; 181 payload_length = ntoh24(login_req->dlength); 182 183 switch (login_req->opcode & ISCSI_OPCODE_MASK) { 184 case ISCSI_OP_LOGIN: 185 break; 186 default: 187 pr_err("Received unknown opcode 0x%02x.\n", 188 login_req->opcode & ISCSI_OPCODE_MASK); 189 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 190 ISCSI_LOGIN_STATUS_INIT_ERR); 191 return -1; 192 } 193 194 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) && 195 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 196 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE" 197 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n"); 198 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 199 ISCSI_LOGIN_STATUS_INIT_ERR); 200 return -1; 201 } 202 203 req_csg = (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2; 204 req_nsg = (login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK); 205 206 if (req_csg != login->current_stage) { 207 pr_err("Initiator unexpectedly changed login stage" 208 " from %d to %d, login failed.\n", login->current_stage, 209 req_csg); 210 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 211 ISCSI_LOGIN_STATUS_INIT_ERR); 212 return -1; 213 } 214 215 if ((req_nsg == 2) || (req_csg >= 2) || 216 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) && 217 (req_nsg <= req_csg))) { 218 pr_err("Illegal login_req->flags Combination, CSG: %d," 219 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg, 220 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)); 221 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 222 ISCSI_LOGIN_STATUS_INIT_ERR); 223 return -1; 224 } 225 226 if ((login_req->max_version != login->version_max) || 227 (login_req->min_version != login->version_min)) { 228 pr_err("Login request changed Version Max/Nin" 229 " unexpectedly to 0x%02x/0x%02x, protocol error\n", 230 login_req->max_version, login_req->min_version); 231 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 232 ISCSI_LOGIN_STATUS_INIT_ERR); 233 return -1; 234 } 235 236 if (memcmp(login_req->isid, login->isid, 6) != 0) { 237 pr_err("Login request changed ISID unexpectedly," 238 " protocol error.\n"); 239 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 240 ISCSI_LOGIN_STATUS_INIT_ERR); 241 return -1; 242 } 243 244 if (login_req->itt != login->init_task_tag) { 245 pr_err("Login request changed ITT unexpectedly to" 246 " 0x%08x, protocol error.\n", login_req->itt); 247 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 248 ISCSI_LOGIN_STATUS_INIT_ERR); 249 return -1; 250 } 251 252 if (payload_length > MAX_KEY_VALUE_PAIRS) { 253 pr_err("Login request payload exceeds default" 254 " MaxRecvDataSegmentLength: %u, protocol error.\n", 255 MAX_KEY_VALUE_PAIRS); 256 return -1; 257 } 258 259 return 0; 260} 261 262static int iscsi_target_check_first_request( 263 struct iscsi_conn *conn, 264 struct iscsi_login *login) 265{ 266 struct iscsi_param *param = NULL; 267 struct se_node_acl *se_nacl; 268 269 login->first_request = 0; 270 271 list_for_each_entry(param, &conn->param_list->param_list, p_list) { 272 if (!strncmp(param->name, SESSIONTYPE, 11)) { 273 if (!IS_PSTATE_ACCEPTOR(param)) { 274 pr_err("SessionType key not received" 275 " in first login request.\n"); 276 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 277 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 278 return -1; 279 } 280 if (!strncmp(param->value, DISCOVERY, 9)) 281 return 0; 282 } 283 284 if (!strncmp(param->name, INITIATORNAME, 13)) { 285 if (!IS_PSTATE_ACCEPTOR(param)) { 286 if (!login->leading_connection) 287 continue; 288 289 pr_err("InitiatorName key not received" 290 " in first login request.\n"); 291 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 292 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 293 return -1; 294 } 295 296 /* 297 * For non-leading connections, double check that the 298 * received InitiatorName matches the existing session's 299 * struct iscsi_node_acl. 300 */ 301 if (!login->leading_connection) { 302 se_nacl = conn->sess->se_sess->se_node_acl; 303 if (!se_nacl) { 304 pr_err("Unable to locate" 305 " struct se_node_acl\n"); 306 iscsit_tx_login_rsp(conn, 307 ISCSI_STATUS_CLS_INITIATOR_ERR, 308 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 309 return -1; 310 } 311 312 if (strcmp(param->value, 313 se_nacl->initiatorname)) { 314 pr_err("Incorrect" 315 " InitiatorName: %s for this" 316 " iSCSI Initiator Node.\n", 317 param->value); 318 iscsit_tx_login_rsp(conn, 319 ISCSI_STATUS_CLS_INITIATOR_ERR, 320 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 321 return -1; 322 } 323 } 324 } 325 } 326 327 return 0; 328} 329 330static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 331{ 332 u32 padding = 0; 333 struct iscsi_session *sess = conn->sess; 334 struct iscsi_login_rsp *login_rsp; 335 336 login_rsp = (struct iscsi_login_rsp *) login->rsp; 337 338 login_rsp->opcode = ISCSI_OP_LOGIN_RSP; 339 hton24(login_rsp->dlength, login->rsp_length); 340 memcpy(login_rsp->isid, login->isid, 6); 341 login_rsp->tsih = cpu_to_be16(login->tsih); 342 login_rsp->itt = cpu_to_be32(login->init_task_tag); 343 login_rsp->statsn = cpu_to_be32(conn->stat_sn++); 344 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 345 login_rsp->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 346 347 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x," 348 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:" 349 " %u\n", login_rsp->flags, ntohl(login_rsp->itt), 350 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn), 351 ntohl(login_rsp->statsn), login->rsp_length); 352 353 padding = ((-login->rsp_length) & 3); 354 355 if (iscsi_login_tx_data( 356 conn, 357 login->rsp, 358 login->rsp_buf, 359 login->rsp_length + padding) < 0) 360 return -1; 361 362 login->rsp_length = 0; 363 login_rsp->tsih = be16_to_cpu(login_rsp->tsih); 364 login_rsp->itt = be32_to_cpu(login_rsp->itt); 365 login_rsp->statsn = be32_to_cpu(login_rsp->statsn); 366 mutex_lock(&sess->cmdsn_mutex); 367 login_rsp->exp_cmdsn = be32_to_cpu(sess->exp_cmd_sn); 368 login_rsp->max_cmdsn = be32_to_cpu(sess->max_cmd_sn); 369 mutex_unlock(&sess->cmdsn_mutex); 370 371 return 0; 372} 373 374static int iscsi_target_do_rx_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 375{ 376 u32 padding = 0, payload_length; 377 struct iscsi_login_req *login_req; 378 379 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0) 380 return -1; 381 382 login_req = (struct iscsi_login_req *) login->req; 383 payload_length = ntoh24(login_req->dlength); 384 login_req->tsih = be16_to_cpu(login_req->tsih); 385 login_req->itt = be32_to_cpu(login_req->itt); 386 login_req->cid = be16_to_cpu(login_req->cid); 387 login_req->cmdsn = be32_to_cpu(login_req->cmdsn); 388 login_req->exp_statsn = be32_to_cpu(login_req->exp_statsn); 389 390 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," 391 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n", 392 login_req->flags, login_req->itt, login_req->cmdsn, 393 login_req->exp_statsn, login_req->cid, payload_length); 394 395 if (iscsi_target_check_login_request(conn, login) < 0) 396 return -1; 397 398 padding = ((-payload_length) & 3); 399 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS); 400 401 if (iscsi_login_rx_data( 402 conn, 403 login->req_buf, 404 payload_length + padding) < 0) 405 return -1; 406 407 return 0; 408} 409 410static int iscsi_target_do_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 411{ 412 if (iscsi_target_do_tx_login_io(conn, login) < 0) 413 return -1; 414 415 if (iscsi_target_do_rx_login_io(conn, login) < 0) 416 return -1; 417 418 return 0; 419} 420 421static int iscsi_target_get_initial_payload( 422 struct iscsi_conn *conn, 423 struct iscsi_login *login) 424{ 425 u32 padding = 0, payload_length; 426 struct iscsi_login_req *login_req; 427 428 login_req = (struct iscsi_login_req *) login->req; 429 payload_length = ntoh24(login_req->dlength); 430 431 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," 432 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 433 login_req->flags, login_req->itt, login_req->cmdsn, 434 login_req->exp_statsn, payload_length); 435 436 if (iscsi_target_check_login_request(conn, login) < 0) 437 return -1; 438 439 padding = ((-payload_length) & 3); 440 441 if (iscsi_login_rx_data( 442 conn, 443 login->req_buf, 444 payload_length + padding) < 0) 445 return -1; 446 447 return 0; 448} 449 450/* 451 * NOTE: We check for existing sessions or connections AFTER the initiator 452 * has been successfully authenticated in order to protect against faked 453 * ISID/TSIH combinations. 454 */ 455static int iscsi_target_check_for_existing_instances( 456 struct iscsi_conn *conn, 457 struct iscsi_login *login) 458{ 459 if (login->checked_for_existing) 460 return 0; 461 462 login->checked_for_existing = 1; 463 464 if (!login->tsih) 465 return iscsi_check_for_session_reinstatement(conn); 466 else 467 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 468 login->initial_exp_statsn); 469} 470 471static int iscsi_target_do_authentication( 472 struct iscsi_conn *conn, 473 struct iscsi_login *login) 474{ 475 int authret; 476 u32 payload_length; 477 struct iscsi_param *param; 478 struct iscsi_login_req *login_req; 479 struct iscsi_login_rsp *login_rsp; 480 481 login_req = (struct iscsi_login_req *) login->req; 482 login_rsp = (struct iscsi_login_rsp *) login->rsp; 483 payload_length = ntoh24(login_req->dlength); 484 485 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 486 if (!param) 487 return -1; 488 489 authret = iscsi_handle_authentication( 490 conn, 491 login->req_buf, 492 login->rsp_buf, 493 payload_length, 494 &login->rsp_length, 495 param->value); 496 switch (authret) { 497 case 0: 498 pr_debug("Received OK response" 499 " from LIO Authentication, continuing.\n"); 500 break; 501 case 1: 502 pr_debug("iSCSI security negotiation" 503 " completed successfully.\n"); 504 login->auth_complete = 1; 505 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 506 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 507 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 508 ISCSI_FLAG_LOGIN_TRANSIT); 509 login->current_stage = 1; 510 } 511 return iscsi_target_check_for_existing_instances( 512 conn, login); 513 case 2: 514 pr_err("Security negotiation" 515 " failed.\n"); 516 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 517 ISCSI_LOGIN_STATUS_AUTH_FAILED); 518 return -1; 519 default: 520 pr_err("Received unknown error %d from LIO" 521 " Authentication\n", authret); 522 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 523 ISCSI_LOGIN_STATUS_TARGET_ERROR); 524 return -1; 525 } 526 527 return 0; 528} 529 530static int iscsi_target_handle_csg_zero( 531 struct iscsi_conn *conn, 532 struct iscsi_login *login) 533{ 534 int ret; 535 u32 payload_length; 536 struct iscsi_param *param; 537 struct iscsi_login_req *login_req; 538 struct iscsi_login_rsp *login_rsp; 539 540 login_req = (struct iscsi_login_req *) login->req; 541 login_rsp = (struct iscsi_login_rsp *) login->rsp; 542 payload_length = ntoh24(login_req->dlength); 543 544 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 545 if (!param) 546 return -1; 547 548 ret = iscsi_decode_text_input( 549 PHASE_SECURITY|PHASE_DECLARATIVE, 550 SENDER_INITIATOR|SENDER_RECEIVER, 551 login->req_buf, 552 payload_length, 553 conn->param_list); 554 if (ret < 0) 555 return -1; 556 557 if (ret > 0) { 558 if (login->auth_complete) { 559 pr_err("Initiator has already been" 560 " successfully authenticated, but is still" 561 " sending %s keys.\n", param->value); 562 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 563 ISCSI_LOGIN_STATUS_INIT_ERR); 564 return -1; 565 } 566 567 goto do_auth; 568 } 569 570 if (login->first_request) 571 if (iscsi_target_check_first_request(conn, login) < 0) 572 return -1; 573 574 ret = iscsi_encode_text_output( 575 PHASE_SECURITY|PHASE_DECLARATIVE, 576 SENDER_TARGET, 577 login->rsp_buf, 578 &login->rsp_length, 579 conn->param_list); 580 if (ret < 0) 581 return -1; 582 583 if (!iscsi_check_negotiated_keys(conn->param_list)) { 584 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication && 585 !strncmp(param->value, NONE, 4)) { 586 pr_err("Initiator sent AuthMethod=None but" 587 " Target is enforcing iSCSI Authentication," 588 " login failed.\n"); 589 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 590 ISCSI_LOGIN_STATUS_AUTH_FAILED); 591 return -1; 592 } 593 594 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication && 595 !login->auth_complete) 596 return 0; 597 598 if (strncmp(param->value, NONE, 4) && !login->auth_complete) 599 return 0; 600 601 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 602 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 603 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 604 ISCSI_FLAG_LOGIN_TRANSIT; 605 login->current_stage = 1; 606 } 607 } 608 609 return 0; 610do_auth: 611 return iscsi_target_do_authentication(conn, login); 612} 613 614static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login) 615{ 616 int ret; 617 u32 payload_length; 618 struct iscsi_login_req *login_req; 619 struct iscsi_login_rsp *login_rsp; 620 621 login_req = (struct iscsi_login_req *) login->req; 622 login_rsp = (struct iscsi_login_rsp *) login->rsp; 623 payload_length = ntoh24(login_req->dlength); 624 625 ret = iscsi_decode_text_input( 626 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 627 SENDER_INITIATOR|SENDER_RECEIVER, 628 login->req_buf, 629 payload_length, 630 conn->param_list); 631 if (ret < 0) 632 return -1; 633 634 if (login->first_request) 635 if (iscsi_target_check_first_request(conn, login) < 0) 636 return -1; 637 638 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 639 return -1; 640 641 ret = iscsi_encode_text_output( 642 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 643 SENDER_TARGET, 644 login->rsp_buf, 645 &login->rsp_length, 646 conn->param_list); 647 if (ret < 0) 648 return -1; 649 650 if (!login->auth_complete && 651 ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication) { 652 pr_err("Initiator is requesting CSG: 1, has not been" 653 " successfully authenticated, and the Target is" 654 " enforcing iSCSI Authentication, login failed.\n"); 655 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 656 ISCSI_LOGIN_STATUS_AUTH_FAILED); 657 return -1; 658 } 659 660 if (!iscsi_check_negotiated_keys(conn->param_list)) 661 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 662 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 663 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 664 ISCSI_FLAG_LOGIN_TRANSIT; 665 666 return 0; 667} 668 669static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login) 670{ 671 int pdu_count = 0; 672 struct iscsi_login_req *login_req; 673 struct iscsi_login_rsp *login_rsp; 674 675 login_req = (struct iscsi_login_req *) login->req; 676 login_rsp = (struct iscsi_login_rsp *) login->rsp; 677 678 while (1) { 679 if (++pdu_count > MAX_LOGIN_PDUS) { 680 pr_err("MAX_LOGIN_PDUS count reached.\n"); 681 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 682 ISCSI_LOGIN_STATUS_TARGET_ERROR); 683 return -1; 684 } 685 686 switch ((login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2) { 687 case 0: 688 login_rsp->flags |= (0 & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK); 689 if (iscsi_target_handle_csg_zero(conn, login) < 0) 690 return -1; 691 break; 692 case 1: 693 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 694 if (iscsi_target_handle_csg_one(conn, login) < 0) 695 return -1; 696 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 697 login->tsih = conn->sess->tsih; 698 if (iscsi_target_do_tx_login_io(conn, 699 login) < 0) 700 return -1; 701 return 0; 702 } 703 break; 704 default: 705 pr_err("Illegal CSG: %d received from" 706 " Initiator, protocol error.\n", 707 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) 708 >> 2); 709 break; 710 } 711 712 if (iscsi_target_do_login_io(conn, login) < 0) 713 return -1; 714 715 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 716 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 717 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 718 } 719 } 720 721 return 0; 722} 723 724static void iscsi_initiatorname_tolower( 725 char *param_buf) 726{ 727 char *c; 728 u32 iqn_size = strlen(param_buf), i; 729 730 for (i = 0; i < iqn_size; i++) { 731 c = ¶m_buf[i]; 732 if (!isupper(*c)) 733 continue; 734 735 *c = tolower(*c); 736 } 737} 738 739/* 740 * Processes the first Login Request.. 741 */ 742static int iscsi_target_locate_portal( 743 struct iscsi_np *np, 744 struct iscsi_conn *conn, 745 struct iscsi_login *login) 746{ 747 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 748 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 749 struct iscsi_session *sess = conn->sess; 750 struct iscsi_tiqn *tiqn; 751 struct iscsi_login_req *login_req; 752 u32 payload_length; 753 int sessiontype = 0, ret = 0; 754 755 login_req = (struct iscsi_login_req *) login->req; 756 payload_length = ntoh24(login_req->dlength); 757 758 login->first_request = 1; 759 login->leading_connection = (!login_req->tsih) ? 1 : 0; 760 login->current_stage = 761 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2; 762 login->version_min = login_req->min_version; 763 login->version_max = login_req->max_version; 764 memcpy(login->isid, login_req->isid, 6); 765 login->cmd_sn = login_req->cmdsn; 766 login->init_task_tag = login_req->itt; 767 login->initial_exp_statsn = login_req->exp_statsn; 768 login->cid = login_req->cid; 769 login->tsih = login_req->tsih; 770 771 if (iscsi_target_get_initial_payload(conn, login) < 0) 772 return -1; 773 774 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL); 775 if (!tmpbuf) { 776 pr_err("Unable to allocate memory for tmpbuf.\n"); 777 return -1; 778 } 779 780 memcpy(tmpbuf, login->req_buf, payload_length); 781 tmpbuf[payload_length] = '\0'; 782 start = tmpbuf; 783 end = (start + payload_length); 784 785 /* 786 * Locate the initial keys expected from the Initiator node in 787 * the first login request in order to progress with the login phase. 788 */ 789 while (start < end) { 790 if (iscsi_extract_key_value(start, &key, &value) < 0) { 791 ret = -1; 792 goto out; 793 } 794 795 if (!strncmp(key, "InitiatorName", 13)) 796 i_buf = value; 797 else if (!strncmp(key, "SessionType", 11)) 798 s_buf = value; 799 else if (!strncmp(key, "TargetName", 10)) 800 t_buf = value; 801 802 start += strlen(key) + strlen(value) + 2; 803 } 804 805 /* 806 * See 5.3. Login Phase. 807 */ 808 if (!i_buf) { 809 pr_err("InitiatorName key not received" 810 " in first login request.\n"); 811 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 812 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 813 ret = -1; 814 goto out; 815 } 816 /* 817 * Convert the incoming InitiatorName to lowercase following 818 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 819 * are NOT case sensitive. 820 */ 821 iscsi_initiatorname_tolower(i_buf); 822 823 if (!s_buf) { 824 if (!login->leading_connection) 825 goto get_target; 826 827 pr_err("SessionType key not received" 828 " in first login request.\n"); 829 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 830 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 831 ret = -1; 832 goto out; 833 } 834 835 /* 836 * Use default portal group for discovery sessions. 837 */ 838 sessiontype = strncmp(s_buf, DISCOVERY, 9); 839 if (!sessiontype) { 840 conn->tpg = iscsit_global->discovery_tpg; 841 if (!login->leading_connection) 842 goto get_target; 843 844 sess->sess_ops->SessionType = 1; 845 /* 846 * Setup crc32c modules from libcrypto 847 */ 848 if (iscsi_login_setup_crypto(conn) < 0) { 849 pr_err("iscsi_login_setup_crypto() failed\n"); 850 ret = -1; 851 goto out; 852 } 853 /* 854 * Serialize access across the discovery struct iscsi_portal_group to 855 * process login attempt. 856 */ 857 if (iscsit_access_np(np, conn->tpg) < 0) { 858 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 859 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 860 ret = -1; 861 goto out; 862 } 863 ret = 0; 864 goto out; 865 } 866 867get_target: 868 if (!t_buf) { 869 pr_err("TargetName key not received" 870 " in first login request while" 871 " SessionType=Normal.\n"); 872 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 873 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 874 ret = -1; 875 goto out; 876 } 877 878 /* 879 * Locate Target IQN from Storage Node. 880 */ 881 tiqn = iscsit_get_tiqn_for_login(t_buf); 882 if (!tiqn) { 883 pr_err("Unable to locate Target IQN: %s in" 884 " Storage Node\n", t_buf); 885 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 886 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 887 ret = -1; 888 goto out; 889 } 890 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 891 892 /* 893 * Locate Target Portal Group from Storage Node. 894 */ 895 conn->tpg = iscsit_get_tpg_from_np(tiqn, np); 896 if (!conn->tpg) { 897 pr_err("Unable to locate Target Portal Group" 898 " on %s\n", tiqn->tiqn); 899 iscsit_put_tiqn_for_login(tiqn); 900 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 901 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 902 ret = -1; 903 goto out; 904 } 905 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 906 /* 907 * Setup crc32c modules from libcrypto 908 */ 909 if (iscsi_login_setup_crypto(conn) < 0) { 910 pr_err("iscsi_login_setup_crypto() failed\n"); 911 ret = -1; 912 goto out; 913 } 914 /* 915 * Serialize access across the struct iscsi_portal_group to 916 * process login attempt. 917 */ 918 if (iscsit_access_np(np, conn->tpg) < 0) { 919 iscsit_put_tiqn_for_login(tiqn); 920 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 921 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 922 ret = -1; 923 conn->tpg = NULL; 924 goto out; 925 } 926 927 /* 928 * conn->sess->node_acl will be set when the referenced 929 * struct iscsi_session is located from received ISID+TSIH in 930 * iscsi_login_non_zero_tsih_s2(). 931 */ 932 if (!login->leading_connection) { 933 ret = 0; 934 goto out; 935 } 936 937 /* 938 * This value is required in iscsi_login_zero_tsih_s2() 939 */ 940 sess->sess_ops->SessionType = 0; 941 942 /* 943 * Locate incoming Initiator IQN reference from Storage Node. 944 */ 945 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 946 &conn->tpg->tpg_se_tpg, i_buf); 947 if (!sess->se_sess->se_node_acl) { 948 pr_err("iSCSI Initiator Node: %s is not authorized to" 949 " access iSCSI target portal group: %hu.\n", 950 i_buf, conn->tpg->tpgt); 951 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 952 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 953 ret = -1; 954 goto out; 955 } 956 957 ret = 0; 958out: 959 kfree(tmpbuf); 960 return ret; 961} 962 963struct iscsi_login *iscsi_target_init_negotiation( 964 struct iscsi_np *np, 965 struct iscsi_conn *conn, 966 char *login_pdu) 967{ 968 struct iscsi_login *login; 969 970 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL); 971 if (!login) { 972 pr_err("Unable to allocate memory for struct iscsi_login.\n"); 973 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 974 ISCSI_LOGIN_STATUS_NO_RESOURCES); 975 return NULL; 976 } 977 978 login->req = kmemdup(login_pdu, ISCSI_HDR_LEN, GFP_KERNEL); 979 if (!login->req) { 980 pr_err("Unable to allocate memory for Login Request.\n"); 981 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 982 ISCSI_LOGIN_STATUS_NO_RESOURCES); 983 goto out; 984 } 985 986 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); 987 if (!login->req_buf) { 988 pr_err("Unable to allocate memory for response buffer.\n"); 989 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 990 ISCSI_LOGIN_STATUS_NO_RESOURCES); 991 goto out; 992 } 993 /* 994 * SessionType: Discovery 995 * 996 * Locates Default Portal 997 * 998 * SessionType: Normal 999 * 1000 * Locates Target Portal from NP -> Target IQN 1001 */ 1002 if (iscsi_target_locate_portal(np, conn, login) < 0) { 1003 pr_err("iSCSI Login negotiation failed.\n"); 1004 goto out; 1005 } 1006 1007 return login; 1008out: 1009 kfree(login->req); 1010 kfree(login->req_buf); 1011 kfree(login); 1012 1013 return NULL; 1014} 1015 1016int iscsi_target_start_negotiation( 1017 struct iscsi_login *login, 1018 struct iscsi_conn *conn) 1019{ 1020 int ret = -1; 1021 1022 login->rsp = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL); 1023 if (!login->rsp) { 1024 pr_err("Unable to allocate memory for" 1025 " Login Response.\n"); 1026 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1027 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1028 ret = -1; 1029 goto out; 1030 } 1031 1032 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); 1033 if (!login->rsp_buf) { 1034 pr_err("Unable to allocate memory for" 1035 " request buffer.\n"); 1036 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1037 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1038 ret = -1; 1039 goto out; 1040 } 1041 1042 ret = iscsi_target_do_login(conn, login); 1043out: 1044 if (ret != 0) 1045 iscsi_remove_failed_auth_entry(conn); 1046 1047 iscsi_target_nego_release(login, conn); 1048 return ret; 1049} 1050 1051void iscsi_target_nego_release( 1052 struct iscsi_login *login, 1053 struct iscsi_conn *conn) 1054{ 1055 kfree(login->req); 1056 kfree(login->rsp); 1057 kfree(login->req_buf); 1058 kfree(login->rsp_buf); 1059 kfree(login); 1060} 1061