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 38 void 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 47 static int 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 60 int 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 } 102 103 static 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 } 166 167 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn) 168 { 169 kfree(conn->auth_protocol); 170 } 171 172 static 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 } 261 262 static 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 } 329 330 static 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 = 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, (__force u32)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 mutex_lock(&sess->cmdsn_mutex); 364 login_rsp->exp_cmdsn = cpu_to_be32(sess->exp_cmd_sn); 365 login_rsp->max_cmdsn = cpu_to_be32(sess->max_cmd_sn); 366 mutex_unlock(&sess->cmdsn_mutex); 367 368 return 0; 369 } 370 371 static int iscsi_target_do_rx_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 372 { 373 u32 padding = 0, payload_length; 374 struct iscsi_login_req *login_req; 375 376 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0) 377 return -1; 378 379 login_req = (struct iscsi_login_req *) login->req; 380 payload_length = ntoh24(login_req->dlength); 381 382 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," 383 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n", 384 login_req->flags, login_req->itt, login_req->cmdsn, 385 login_req->exp_statsn, login_req->cid, payload_length); 386 387 if (iscsi_target_check_login_request(conn, login) < 0) 388 return -1; 389 390 padding = ((-payload_length) & 3); 391 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS); 392 393 if (iscsi_login_rx_data( 394 conn, 395 login->req_buf, 396 payload_length + padding) < 0) 397 return -1; 398 399 return 0; 400 } 401 402 static int iscsi_target_do_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 403 { 404 if (iscsi_target_do_tx_login_io(conn, login) < 0) 405 return -1; 406 407 if (iscsi_target_do_rx_login_io(conn, login) < 0) 408 return -1; 409 410 return 0; 411 } 412 413 static int iscsi_target_get_initial_payload( 414 struct iscsi_conn *conn, 415 struct iscsi_login *login) 416 { 417 u32 padding = 0, payload_length; 418 struct iscsi_login_req *login_req; 419 420 login_req = (struct iscsi_login_req *) login->req; 421 payload_length = ntoh24(login_req->dlength); 422 423 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," 424 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 425 login_req->flags, login_req->itt, login_req->cmdsn, 426 login_req->exp_statsn, payload_length); 427 428 if (iscsi_target_check_login_request(conn, login) < 0) 429 return -1; 430 431 padding = ((-payload_length) & 3); 432 433 if (iscsi_login_rx_data( 434 conn, 435 login->req_buf, 436 payload_length + padding) < 0) 437 return -1; 438 439 return 0; 440 } 441 442 /* 443 * NOTE: We check for existing sessions or connections AFTER the initiator 444 * has been successfully authenticated in order to protect against faked 445 * ISID/TSIH combinations. 446 */ 447 static int iscsi_target_check_for_existing_instances( 448 struct iscsi_conn *conn, 449 struct iscsi_login *login) 450 { 451 if (login->checked_for_existing) 452 return 0; 453 454 login->checked_for_existing = 1; 455 456 if (!login->tsih) 457 return iscsi_check_for_session_reinstatement(conn); 458 else 459 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 460 login->initial_exp_statsn); 461 } 462 463 static int iscsi_target_do_authentication( 464 struct iscsi_conn *conn, 465 struct iscsi_login *login) 466 { 467 int authret; 468 u32 payload_length; 469 struct iscsi_param *param; 470 struct iscsi_login_req *login_req; 471 struct iscsi_login_rsp *login_rsp; 472 473 login_req = (struct iscsi_login_req *) login->req; 474 login_rsp = (struct iscsi_login_rsp *) login->rsp; 475 payload_length = ntoh24(login_req->dlength); 476 477 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 478 if (!param) 479 return -1; 480 481 authret = iscsi_handle_authentication( 482 conn, 483 login->req_buf, 484 login->rsp_buf, 485 payload_length, 486 &login->rsp_length, 487 param->value); 488 switch (authret) { 489 case 0: 490 pr_debug("Received OK response" 491 " from LIO Authentication, continuing.\n"); 492 break; 493 case 1: 494 pr_debug("iSCSI security negotiation" 495 " completed successfully.\n"); 496 login->auth_complete = 1; 497 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 498 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 499 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 500 ISCSI_FLAG_LOGIN_TRANSIT); 501 login->current_stage = 1; 502 } 503 return iscsi_target_check_for_existing_instances( 504 conn, login); 505 case 2: 506 pr_err("Security negotiation" 507 " failed.\n"); 508 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 509 ISCSI_LOGIN_STATUS_AUTH_FAILED); 510 return -1; 511 default: 512 pr_err("Received unknown error %d from LIO" 513 " Authentication\n", authret); 514 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 515 ISCSI_LOGIN_STATUS_TARGET_ERROR); 516 return -1; 517 } 518 519 return 0; 520 } 521 522 static int iscsi_target_handle_csg_zero( 523 struct iscsi_conn *conn, 524 struct iscsi_login *login) 525 { 526 int ret; 527 u32 payload_length; 528 struct iscsi_param *param; 529 struct iscsi_login_req *login_req; 530 struct iscsi_login_rsp *login_rsp; 531 532 login_req = (struct iscsi_login_req *) login->req; 533 login_rsp = (struct iscsi_login_rsp *) login->rsp; 534 payload_length = ntoh24(login_req->dlength); 535 536 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 537 if (!param) 538 return -1; 539 540 ret = iscsi_decode_text_input( 541 PHASE_SECURITY|PHASE_DECLARATIVE, 542 SENDER_INITIATOR|SENDER_RECEIVER, 543 login->req_buf, 544 payload_length, 545 conn); 546 if (ret < 0) 547 return -1; 548 549 if (ret > 0) { 550 if (login->auth_complete) { 551 pr_err("Initiator has already been" 552 " successfully authenticated, but is still" 553 " sending %s keys.\n", param->value); 554 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 555 ISCSI_LOGIN_STATUS_INIT_ERR); 556 return -1; 557 } 558 559 goto do_auth; 560 } 561 562 if (login->first_request) 563 if (iscsi_target_check_first_request(conn, login) < 0) 564 return -1; 565 566 ret = iscsi_encode_text_output( 567 PHASE_SECURITY|PHASE_DECLARATIVE, 568 SENDER_TARGET, 569 login->rsp_buf, 570 &login->rsp_length, 571 conn->param_list); 572 if (ret < 0) 573 return -1; 574 575 if (!iscsi_check_negotiated_keys(conn->param_list)) { 576 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication && 577 !strncmp(param->value, NONE, 4)) { 578 pr_err("Initiator sent AuthMethod=None but" 579 " Target is enforcing iSCSI Authentication," 580 " login failed.\n"); 581 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 582 ISCSI_LOGIN_STATUS_AUTH_FAILED); 583 return -1; 584 } 585 586 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication && 587 !login->auth_complete) 588 return 0; 589 590 if (strncmp(param->value, NONE, 4) && !login->auth_complete) 591 return 0; 592 593 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 594 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 595 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 596 ISCSI_FLAG_LOGIN_TRANSIT; 597 login->current_stage = 1; 598 } 599 } 600 601 return 0; 602 do_auth: 603 return iscsi_target_do_authentication(conn, login); 604 } 605 606 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login) 607 { 608 int ret; 609 u32 payload_length; 610 struct iscsi_login_req *login_req; 611 struct iscsi_login_rsp *login_rsp; 612 613 login_req = (struct iscsi_login_req *) login->req; 614 login_rsp = (struct iscsi_login_rsp *) login->rsp; 615 payload_length = ntoh24(login_req->dlength); 616 617 ret = iscsi_decode_text_input( 618 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 619 SENDER_INITIATOR|SENDER_RECEIVER, 620 login->req_buf, 621 payload_length, 622 conn); 623 if (ret < 0) 624 return -1; 625 626 if (login->first_request) 627 if (iscsi_target_check_first_request(conn, login) < 0) 628 return -1; 629 630 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 631 return -1; 632 633 ret = iscsi_encode_text_output( 634 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 635 SENDER_TARGET, 636 login->rsp_buf, 637 &login->rsp_length, 638 conn->param_list); 639 if (ret < 0) 640 return -1; 641 642 if (!login->auth_complete && 643 ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication) { 644 pr_err("Initiator is requesting CSG: 1, has not been" 645 " successfully authenticated, and the Target is" 646 " enforcing iSCSI Authentication, login failed.\n"); 647 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 648 ISCSI_LOGIN_STATUS_AUTH_FAILED); 649 return -1; 650 } 651 652 if (!iscsi_check_negotiated_keys(conn->param_list)) 653 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 654 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 655 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 656 ISCSI_FLAG_LOGIN_TRANSIT; 657 658 return 0; 659 } 660 661 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login) 662 { 663 int pdu_count = 0; 664 struct iscsi_login_req *login_req; 665 struct iscsi_login_rsp *login_rsp; 666 667 login_req = (struct iscsi_login_req *) login->req; 668 login_rsp = (struct iscsi_login_rsp *) login->rsp; 669 670 while (1) { 671 if (++pdu_count > MAX_LOGIN_PDUS) { 672 pr_err("MAX_LOGIN_PDUS count reached.\n"); 673 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 674 ISCSI_LOGIN_STATUS_TARGET_ERROR); 675 return -1; 676 } 677 678 switch ((login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2) { 679 case 0: 680 login_rsp->flags |= (0 & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK); 681 if (iscsi_target_handle_csg_zero(conn, login) < 0) 682 return -1; 683 break; 684 case 1: 685 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 686 if (iscsi_target_handle_csg_one(conn, login) < 0) 687 return -1; 688 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 689 login->tsih = conn->sess->tsih; 690 if (iscsi_target_do_tx_login_io(conn, 691 login) < 0) 692 return -1; 693 return 0; 694 } 695 break; 696 default: 697 pr_err("Illegal CSG: %d received from" 698 " Initiator, protocol error.\n", 699 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) 700 >> 2); 701 break; 702 } 703 704 if (iscsi_target_do_login_io(conn, login) < 0) 705 return -1; 706 707 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 708 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 709 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 710 } 711 } 712 713 return 0; 714 } 715 716 static void iscsi_initiatorname_tolower( 717 char *param_buf) 718 { 719 char *c; 720 u32 iqn_size = strlen(param_buf), i; 721 722 for (i = 0; i < iqn_size; i++) { 723 c = ¶m_buf[i]; 724 if (!isupper(*c)) 725 continue; 726 727 *c = tolower(*c); 728 } 729 } 730 731 /* 732 * Processes the first Login Request.. 733 */ 734 static int iscsi_target_locate_portal( 735 struct iscsi_np *np, 736 struct iscsi_conn *conn, 737 struct iscsi_login *login) 738 { 739 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 740 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 741 struct iscsi_session *sess = conn->sess; 742 struct iscsi_tiqn *tiqn; 743 struct iscsi_login_req *login_req; 744 u32 payload_length; 745 int sessiontype = 0, ret = 0; 746 747 login_req = (struct iscsi_login_req *) login->req; 748 payload_length = ntoh24(login_req->dlength); 749 750 login->first_request = 1; 751 login->leading_connection = (!login_req->tsih) ? 1 : 0; 752 login->current_stage = 753 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2; 754 login->version_min = login_req->min_version; 755 login->version_max = login_req->max_version; 756 memcpy(login->isid, login_req->isid, 6); 757 login->cmd_sn = be32_to_cpu(login_req->cmdsn); 758 login->init_task_tag = login_req->itt; 759 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); 760 login->cid = be16_to_cpu(login_req->cid); 761 login->tsih = be16_to_cpu(login_req->tsih); 762 763 if (iscsi_target_get_initial_payload(conn, login) < 0) 764 return -1; 765 766 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL); 767 if (!tmpbuf) { 768 pr_err("Unable to allocate memory for tmpbuf.\n"); 769 return -1; 770 } 771 772 memcpy(tmpbuf, login->req_buf, payload_length); 773 tmpbuf[payload_length] = '\0'; 774 start = tmpbuf; 775 end = (start + payload_length); 776 777 /* 778 * Locate the initial keys expected from the Initiator node in 779 * the first login request in order to progress with the login phase. 780 */ 781 while (start < end) { 782 if (iscsi_extract_key_value(start, &key, &value) < 0) { 783 ret = -1; 784 goto out; 785 } 786 787 if (!strncmp(key, "InitiatorName", 13)) 788 i_buf = value; 789 else if (!strncmp(key, "SessionType", 11)) 790 s_buf = value; 791 else if (!strncmp(key, "TargetName", 10)) 792 t_buf = value; 793 794 start += strlen(key) + strlen(value) + 2; 795 } 796 797 /* 798 * See 5.3. Login Phase. 799 */ 800 if (!i_buf) { 801 pr_err("InitiatorName key not received" 802 " in first login request.\n"); 803 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 804 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 805 ret = -1; 806 goto out; 807 } 808 /* 809 * Convert the incoming InitiatorName to lowercase following 810 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 811 * are NOT case sensitive. 812 */ 813 iscsi_initiatorname_tolower(i_buf); 814 815 if (!s_buf) { 816 if (!login->leading_connection) 817 goto get_target; 818 819 pr_err("SessionType key not received" 820 " in first login request.\n"); 821 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 822 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 823 ret = -1; 824 goto out; 825 } 826 827 /* 828 * Use default portal group for discovery sessions. 829 */ 830 sessiontype = strncmp(s_buf, DISCOVERY, 9); 831 if (!sessiontype) { 832 conn->tpg = iscsit_global->discovery_tpg; 833 if (!login->leading_connection) 834 goto get_target; 835 836 sess->sess_ops->SessionType = 1; 837 /* 838 * Setup crc32c modules from libcrypto 839 */ 840 if (iscsi_login_setup_crypto(conn) < 0) { 841 pr_err("iscsi_login_setup_crypto() failed\n"); 842 ret = -1; 843 goto out; 844 } 845 /* 846 * Serialize access across the discovery struct iscsi_portal_group to 847 * process login attempt. 848 */ 849 if (iscsit_access_np(np, conn->tpg) < 0) { 850 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 851 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 852 ret = -1; 853 goto out; 854 } 855 ret = 0; 856 goto out; 857 } 858 859 get_target: 860 if (!t_buf) { 861 pr_err("TargetName key not received" 862 " in first login request while" 863 " SessionType=Normal.\n"); 864 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 865 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 866 ret = -1; 867 goto out; 868 } 869 870 /* 871 * Locate Target IQN from Storage Node. 872 */ 873 tiqn = iscsit_get_tiqn_for_login(t_buf); 874 if (!tiqn) { 875 pr_err("Unable to locate Target IQN: %s in" 876 " Storage Node\n", t_buf); 877 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 878 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 879 ret = -1; 880 goto out; 881 } 882 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 883 884 /* 885 * Locate Target Portal Group from Storage Node. 886 */ 887 conn->tpg = iscsit_get_tpg_from_np(tiqn, np); 888 if (!conn->tpg) { 889 pr_err("Unable to locate Target Portal Group" 890 " on %s\n", tiqn->tiqn); 891 iscsit_put_tiqn_for_login(tiqn); 892 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 893 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 894 ret = -1; 895 goto out; 896 } 897 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 898 /* 899 * Setup crc32c modules from libcrypto 900 */ 901 if (iscsi_login_setup_crypto(conn) < 0) { 902 pr_err("iscsi_login_setup_crypto() failed\n"); 903 ret = -1; 904 goto out; 905 } 906 /* 907 * Serialize access across the struct iscsi_portal_group to 908 * process login attempt. 909 */ 910 if (iscsit_access_np(np, conn->tpg) < 0) { 911 iscsit_put_tiqn_for_login(tiqn); 912 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 913 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 914 ret = -1; 915 conn->tpg = NULL; 916 goto out; 917 } 918 919 /* 920 * conn->sess->node_acl will be set when the referenced 921 * struct iscsi_session is located from received ISID+TSIH in 922 * iscsi_login_non_zero_tsih_s2(). 923 */ 924 if (!login->leading_connection) { 925 ret = 0; 926 goto out; 927 } 928 929 /* 930 * This value is required in iscsi_login_zero_tsih_s2() 931 */ 932 sess->sess_ops->SessionType = 0; 933 934 /* 935 * Locate incoming Initiator IQN reference from Storage Node. 936 */ 937 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 938 &conn->tpg->tpg_se_tpg, i_buf); 939 if (!sess->se_sess->se_node_acl) { 940 pr_err("iSCSI Initiator Node: %s is not authorized to" 941 " access iSCSI target portal group: %hu.\n", 942 i_buf, conn->tpg->tpgt); 943 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 944 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 945 ret = -1; 946 goto out; 947 } 948 949 ret = 0; 950 out: 951 kfree(tmpbuf); 952 return ret; 953 } 954 955 struct iscsi_login *iscsi_target_init_negotiation( 956 struct iscsi_np *np, 957 struct iscsi_conn *conn, 958 char *login_pdu) 959 { 960 struct iscsi_login *login; 961 962 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL); 963 if (!login) { 964 pr_err("Unable to allocate memory for struct iscsi_login.\n"); 965 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 966 ISCSI_LOGIN_STATUS_NO_RESOURCES); 967 return NULL; 968 } 969 970 login->req = kmemdup(login_pdu, ISCSI_HDR_LEN, GFP_KERNEL); 971 if (!login->req) { 972 pr_err("Unable to allocate memory for Login Request.\n"); 973 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 974 ISCSI_LOGIN_STATUS_NO_RESOURCES); 975 goto out; 976 } 977 978 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); 979 if (!login->req_buf) { 980 pr_err("Unable to allocate memory for response buffer.\n"); 981 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 982 ISCSI_LOGIN_STATUS_NO_RESOURCES); 983 goto out; 984 } 985 /* 986 * SessionType: Discovery 987 * 988 * Locates Default Portal 989 * 990 * SessionType: Normal 991 * 992 * Locates Target Portal from NP -> Target IQN 993 */ 994 if (iscsi_target_locate_portal(np, conn, login) < 0) { 995 goto out; 996 } 997 998 return login; 999 out: 1000 kfree(login->req); 1001 kfree(login->req_buf); 1002 kfree(login); 1003 1004 return NULL; 1005 } 1006 1007 int iscsi_target_start_negotiation( 1008 struct iscsi_login *login, 1009 struct iscsi_conn *conn) 1010 { 1011 int ret = -1; 1012 1013 login->rsp = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL); 1014 if (!login->rsp) { 1015 pr_err("Unable to allocate memory for" 1016 " Login Response.\n"); 1017 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1018 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1019 ret = -1; 1020 goto out; 1021 } 1022 1023 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); 1024 if (!login->rsp_buf) { 1025 pr_err("Unable to allocate memory for" 1026 " request buffer.\n"); 1027 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1028 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1029 ret = -1; 1030 goto out; 1031 } 1032 1033 ret = iscsi_target_do_login(conn, login); 1034 out: 1035 if (ret != 0) 1036 iscsi_remove_failed_auth_entry(conn); 1037 1038 iscsi_target_nego_release(login, conn); 1039 return ret; 1040 } 1041 1042 void iscsi_target_nego_release( 1043 struct iscsi_login *login, 1044 struct iscsi_conn *conn) 1045 { 1046 kfree(login->req); 1047 kfree(login->rsp); 1048 kfree(login->req_buf); 1049 kfree(login->rsp_buf); 1050 kfree(login); 1051 } 1052