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_tpg.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 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 exeeds 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, rsp_csg, rsp_nsg; 177 u32 payload_length; 178 struct iscsi_login_req *login_req; 179 struct iscsi_login_rsp *login_rsp; 180 181 login_req = (struct iscsi_login_req *) login->req; 182 login_rsp = (struct iscsi_login_rsp *) login->rsp; 183 payload_length = ntoh24(login_req->dlength); 184 185 switch (login_req->opcode & ISCSI_OPCODE_MASK) { 186 case ISCSI_OP_LOGIN: 187 break; 188 default: 189 pr_err("Received unknown opcode 0x%02x.\n", 190 login_req->opcode & ISCSI_OPCODE_MASK); 191 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 192 ISCSI_LOGIN_STATUS_INIT_ERR); 193 return -1; 194 } 195 196 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) && 197 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 198 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE" 199 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n"); 200 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 201 ISCSI_LOGIN_STATUS_INIT_ERR); 202 return -1; 203 } 204 205 req_csg = (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2; 206 rsp_csg = (login_rsp->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2; 207 req_nsg = (login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK); 208 rsp_nsg = (login_rsp->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK); 209 210 if (req_csg != login->current_stage) { 211 pr_err("Initiator unexpectedly changed login stage" 212 " from %d to %d, login failed.\n", login->current_stage, 213 req_csg); 214 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 215 ISCSI_LOGIN_STATUS_INIT_ERR); 216 return -1; 217 } 218 219 if ((req_nsg == 2) || (req_csg >= 2) || 220 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) && 221 (req_nsg <= req_csg))) { 222 pr_err("Illegal login_req->flags Combination, CSG: %d," 223 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg, 224 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)); 225 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 226 ISCSI_LOGIN_STATUS_INIT_ERR); 227 return -1; 228 } 229 230 if ((login_req->max_version != login->version_max) || 231 (login_req->min_version != login->version_min)) { 232 pr_err("Login request changed Version Max/Nin" 233 " unexpectedly to 0x%02x/0x%02x, protocol error\n", 234 login_req->max_version, login_req->min_version); 235 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 236 ISCSI_LOGIN_STATUS_INIT_ERR); 237 return -1; 238 } 239 240 if (memcmp(login_req->isid, login->isid, 6) != 0) { 241 pr_err("Login request changed ISID unexpectedly," 242 " protocol error.\n"); 243 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 244 ISCSI_LOGIN_STATUS_INIT_ERR); 245 return -1; 246 } 247 248 if (login_req->itt != login->init_task_tag) { 249 pr_err("Login request changed ITT unexpectedly to" 250 " 0x%08x, protocol error.\n", login_req->itt); 251 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 252 ISCSI_LOGIN_STATUS_INIT_ERR); 253 return -1; 254 } 255 256 if (payload_length > MAX_KEY_VALUE_PAIRS) { 257 pr_err("Login request payload exceeds default" 258 " MaxRecvDataSegmentLength: %u, protocol error.\n", 259 MAX_KEY_VALUE_PAIRS); 260 return -1; 261 } 262 263 return 0; 264 } 265 266 static int iscsi_target_check_first_request( 267 struct iscsi_conn *conn, 268 struct iscsi_login *login) 269 { 270 struct iscsi_param *param = NULL; 271 struct se_node_acl *se_nacl; 272 273 login->first_request = 0; 274 275 list_for_each_entry(param, &conn->param_list->param_list, p_list) { 276 if (!strncmp(param->name, SESSIONTYPE, 11)) { 277 if (!IS_PSTATE_ACCEPTOR(param)) { 278 pr_err("SessionType key not received" 279 " in first login request.\n"); 280 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 281 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 282 return -1; 283 } 284 if (!strncmp(param->value, DISCOVERY, 9)) 285 return 0; 286 } 287 288 if (!strncmp(param->name, INITIATORNAME, 13)) { 289 if (!IS_PSTATE_ACCEPTOR(param)) { 290 if (!login->leading_connection) 291 continue; 292 293 pr_err("InitiatorName key not received" 294 " in first login request.\n"); 295 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 296 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 297 return -1; 298 } 299 300 /* 301 * For non-leading connections, double check that the 302 * received InitiatorName matches the existing session's 303 * struct iscsi_node_acl. 304 */ 305 if (!login->leading_connection) { 306 se_nacl = conn->sess->se_sess->se_node_acl; 307 if (!se_nacl) { 308 pr_err("Unable to locate" 309 " struct se_node_acl\n"); 310 iscsit_tx_login_rsp(conn, 311 ISCSI_STATUS_CLS_INITIATOR_ERR, 312 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 313 return -1; 314 } 315 316 if (strcmp(param->value, 317 se_nacl->initiatorname)) { 318 pr_err("Incorrect" 319 " InitiatorName: %s for this" 320 " iSCSI Initiator Node.\n", 321 param->value); 322 iscsit_tx_login_rsp(conn, 323 ISCSI_STATUS_CLS_INITIATOR_ERR, 324 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 325 return -1; 326 } 327 } 328 } 329 } 330 331 return 0; 332 } 333 334 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 335 { 336 u32 padding = 0; 337 struct iscsi_session *sess = conn->sess; 338 struct iscsi_login_rsp *login_rsp; 339 340 login_rsp = (struct iscsi_login_rsp *) login->rsp; 341 342 login_rsp->opcode = ISCSI_OP_LOGIN_RSP; 343 hton24(login_rsp->dlength, login->rsp_length); 344 memcpy(login_rsp->isid, login->isid, 6); 345 login_rsp->tsih = cpu_to_be16(login->tsih); 346 login_rsp->itt = cpu_to_be32(login->init_task_tag); 347 login_rsp->statsn = cpu_to_be32(conn->stat_sn++); 348 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 349 login_rsp->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 350 351 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x," 352 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:" 353 " %u\n", login_rsp->flags, ntohl(login_rsp->itt), 354 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn), 355 ntohl(login_rsp->statsn), login->rsp_length); 356 357 padding = ((-login->rsp_length) & 3); 358 359 if (iscsi_login_tx_data( 360 conn, 361 login->rsp, 362 login->rsp_buf, 363 login->rsp_length + padding) < 0) 364 return -1; 365 366 login->rsp_length = 0; 367 login_rsp->tsih = be16_to_cpu(login_rsp->tsih); 368 login_rsp->itt = be32_to_cpu(login_rsp->itt); 369 login_rsp->statsn = be32_to_cpu(login_rsp->statsn); 370 mutex_lock(&sess->cmdsn_mutex); 371 login_rsp->exp_cmdsn = be32_to_cpu(sess->exp_cmd_sn); 372 login_rsp->max_cmdsn = be32_to_cpu(sess->max_cmd_sn); 373 mutex_unlock(&sess->cmdsn_mutex); 374 375 return 0; 376 } 377 378 static int iscsi_target_do_rx_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 379 { 380 u32 padding = 0, payload_length; 381 struct iscsi_login_req *login_req; 382 383 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0) 384 return -1; 385 386 login_req = (struct iscsi_login_req *) login->req; 387 payload_length = ntoh24(login_req->dlength); 388 login_req->tsih = be16_to_cpu(login_req->tsih); 389 login_req->itt = be32_to_cpu(login_req->itt); 390 login_req->cid = be16_to_cpu(login_req->cid); 391 login_req->cmdsn = be32_to_cpu(login_req->cmdsn); 392 login_req->exp_statsn = be32_to_cpu(login_req->exp_statsn); 393 394 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," 395 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n", 396 login_req->flags, login_req->itt, login_req->cmdsn, 397 login_req->exp_statsn, login_req->cid, payload_length); 398 399 if (iscsi_target_check_login_request(conn, login) < 0) 400 return -1; 401 402 padding = ((-payload_length) & 3); 403 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS); 404 405 if (iscsi_login_rx_data( 406 conn, 407 login->req_buf, 408 payload_length + padding) < 0) 409 return -1; 410 411 return 0; 412 } 413 414 static int iscsi_target_do_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 415 { 416 if (iscsi_target_do_tx_login_io(conn, login) < 0) 417 return -1; 418 419 if (iscsi_target_do_rx_login_io(conn, login) < 0) 420 return -1; 421 422 return 0; 423 } 424 425 static int iscsi_target_get_initial_payload( 426 struct iscsi_conn *conn, 427 struct iscsi_login *login) 428 { 429 u32 padding = 0, payload_length; 430 struct iscsi_login_req *login_req; 431 432 login_req = (struct iscsi_login_req *) login->req; 433 payload_length = ntoh24(login_req->dlength); 434 435 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," 436 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 437 login_req->flags, login_req->itt, login_req->cmdsn, 438 login_req->exp_statsn, payload_length); 439 440 if (iscsi_target_check_login_request(conn, login) < 0) 441 return -1; 442 443 padding = ((-payload_length) & 3); 444 445 if (iscsi_login_rx_data( 446 conn, 447 login->req_buf, 448 payload_length + padding) < 0) 449 return -1; 450 451 return 0; 452 } 453 454 /* 455 * NOTE: We check for existing sessions or connections AFTER the initiator 456 * has been successfully authenticated in order to protect against faked 457 * ISID/TSIH combinations. 458 */ 459 static int iscsi_target_check_for_existing_instances( 460 struct iscsi_conn *conn, 461 struct iscsi_login *login) 462 { 463 if (login->checked_for_existing) 464 return 0; 465 466 login->checked_for_existing = 1; 467 468 if (!login->tsih) 469 return iscsi_check_for_session_reinstatement(conn); 470 else 471 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 472 login->initial_exp_statsn); 473 } 474 475 static int iscsi_target_do_authentication( 476 struct iscsi_conn *conn, 477 struct iscsi_login *login) 478 { 479 int authret; 480 u32 payload_length; 481 struct iscsi_param *param; 482 struct iscsi_login_req *login_req; 483 struct iscsi_login_rsp *login_rsp; 484 485 login_req = (struct iscsi_login_req *) login->req; 486 login_rsp = (struct iscsi_login_rsp *) login->rsp; 487 payload_length = ntoh24(login_req->dlength); 488 489 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 490 if (!param) 491 return -1; 492 493 authret = iscsi_handle_authentication( 494 conn, 495 login->req_buf, 496 login->rsp_buf, 497 payload_length, 498 &login->rsp_length, 499 param->value); 500 switch (authret) { 501 case 0: 502 pr_debug("Received OK response" 503 " from LIO Authentication, continuing.\n"); 504 break; 505 case 1: 506 pr_debug("iSCSI security negotiation" 507 " completed successfully.\n"); 508 login->auth_complete = 1; 509 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 510 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 511 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 512 ISCSI_FLAG_LOGIN_TRANSIT); 513 login->current_stage = 1; 514 } 515 return iscsi_target_check_for_existing_instances( 516 conn, login); 517 case 2: 518 pr_err("Security negotiation" 519 " failed.\n"); 520 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 521 ISCSI_LOGIN_STATUS_AUTH_FAILED); 522 return -1; 523 default: 524 pr_err("Received unknown error %d from LIO" 525 " Authentication\n", authret); 526 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 527 ISCSI_LOGIN_STATUS_TARGET_ERROR); 528 return -1; 529 } 530 531 return 0; 532 } 533 534 static int iscsi_target_handle_csg_zero( 535 struct iscsi_conn *conn, 536 struct iscsi_login *login) 537 { 538 int ret; 539 u32 payload_length; 540 struct iscsi_param *param; 541 struct iscsi_login_req *login_req; 542 struct iscsi_login_rsp *login_rsp; 543 544 login_req = (struct iscsi_login_req *) login->req; 545 login_rsp = (struct iscsi_login_rsp *) login->rsp; 546 payload_length = ntoh24(login_req->dlength); 547 548 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 549 if (!param) 550 return -1; 551 552 ret = iscsi_decode_text_input( 553 PHASE_SECURITY|PHASE_DECLARATIVE, 554 SENDER_INITIATOR|SENDER_RECEIVER, 555 login->req_buf, 556 payload_length, 557 conn->param_list); 558 if (ret < 0) 559 return -1; 560 561 if (ret > 0) { 562 if (login->auth_complete) { 563 pr_err("Initiator has already been" 564 " successfully authenticated, but is still" 565 " sending %s keys.\n", param->value); 566 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 567 ISCSI_LOGIN_STATUS_INIT_ERR); 568 return -1; 569 } 570 571 goto do_auth; 572 } 573 574 if (login->first_request) 575 if (iscsi_target_check_first_request(conn, login) < 0) 576 return -1; 577 578 ret = iscsi_encode_text_output( 579 PHASE_SECURITY|PHASE_DECLARATIVE, 580 SENDER_TARGET, 581 login->rsp_buf, 582 &login->rsp_length, 583 conn->param_list); 584 if (ret < 0) 585 return -1; 586 587 if (!iscsi_check_negotiated_keys(conn->param_list)) { 588 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication && 589 !strncmp(param->value, NONE, 4)) { 590 pr_err("Initiator sent AuthMethod=None but" 591 " Target is enforcing iSCSI Authentication," 592 " login failed.\n"); 593 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 594 ISCSI_LOGIN_STATUS_AUTH_FAILED); 595 return -1; 596 } 597 598 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication && 599 !login->auth_complete) 600 return 0; 601 602 if (strncmp(param->value, NONE, 4) && !login->auth_complete) 603 return 0; 604 605 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 606 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 607 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 608 ISCSI_FLAG_LOGIN_TRANSIT; 609 login->current_stage = 1; 610 } 611 } 612 613 return 0; 614 do_auth: 615 return iscsi_target_do_authentication(conn, login); 616 } 617 618 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login) 619 { 620 int ret; 621 u32 payload_length; 622 struct iscsi_login_req *login_req; 623 struct iscsi_login_rsp *login_rsp; 624 625 login_req = (struct iscsi_login_req *) login->req; 626 login_rsp = (struct iscsi_login_rsp *) login->rsp; 627 payload_length = ntoh24(login_req->dlength); 628 629 ret = iscsi_decode_text_input( 630 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 631 SENDER_INITIATOR|SENDER_RECEIVER, 632 login->req_buf, 633 payload_length, 634 conn->param_list); 635 if (ret < 0) 636 return -1; 637 638 if (login->first_request) 639 if (iscsi_target_check_first_request(conn, login) < 0) 640 return -1; 641 642 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 643 return -1; 644 645 ret = iscsi_encode_text_output( 646 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 647 SENDER_TARGET, 648 login->rsp_buf, 649 &login->rsp_length, 650 conn->param_list); 651 if (ret < 0) 652 return -1; 653 654 if (!login->auth_complete && 655 ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication) { 656 pr_err("Initiator is requesting CSG: 1, has not been" 657 " successfully authenticated, and the Target is" 658 " enforcing iSCSI Authentication, login failed.\n"); 659 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 660 ISCSI_LOGIN_STATUS_AUTH_FAILED); 661 return -1; 662 } 663 664 if (!iscsi_check_negotiated_keys(conn->param_list)) 665 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 666 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 667 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 668 ISCSI_FLAG_LOGIN_TRANSIT; 669 670 return 0; 671 } 672 673 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login) 674 { 675 int pdu_count = 0; 676 struct iscsi_login_req *login_req; 677 struct iscsi_login_rsp *login_rsp; 678 679 login_req = (struct iscsi_login_req *) login->req; 680 login_rsp = (struct iscsi_login_rsp *) login->rsp; 681 682 while (1) { 683 if (++pdu_count > MAX_LOGIN_PDUS) { 684 pr_err("MAX_LOGIN_PDUS count reached.\n"); 685 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 686 ISCSI_LOGIN_STATUS_TARGET_ERROR); 687 return -1; 688 } 689 690 switch ((login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2) { 691 case 0: 692 login_rsp->flags |= (0 & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK); 693 if (iscsi_target_handle_csg_zero(conn, login) < 0) 694 return -1; 695 break; 696 case 1: 697 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 698 if (iscsi_target_handle_csg_one(conn, login) < 0) 699 return -1; 700 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 701 login->tsih = conn->sess->tsih; 702 if (iscsi_target_do_tx_login_io(conn, 703 login) < 0) 704 return -1; 705 return 0; 706 } 707 break; 708 default: 709 pr_err("Illegal CSG: %d received from" 710 " Initiator, protocol error.\n", 711 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) 712 >> 2); 713 break; 714 } 715 716 if (iscsi_target_do_login_io(conn, login) < 0) 717 return -1; 718 719 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 720 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 721 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 722 } 723 } 724 725 return 0; 726 } 727 728 static void iscsi_initiatorname_tolower( 729 char *param_buf) 730 { 731 char *c; 732 u32 iqn_size = strlen(param_buf), i; 733 734 for (i = 0; i < iqn_size; i++) { 735 c = (char *)¶m_buf[i]; 736 if (!isupper(*c)) 737 continue; 738 739 *c = tolower(*c); 740 } 741 } 742 743 /* 744 * Processes the first Login Request.. 745 */ 746 static int iscsi_target_locate_portal( 747 struct iscsi_np *np, 748 struct iscsi_conn *conn, 749 struct iscsi_login *login) 750 { 751 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 752 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 753 struct iscsi_session *sess = conn->sess; 754 struct iscsi_tiqn *tiqn; 755 struct iscsi_login_req *login_req; 756 struct iscsi_targ_login_rsp *login_rsp; 757 u32 payload_length; 758 int sessiontype = 0, ret = 0; 759 760 login_req = (struct iscsi_login_req *) login->req; 761 login_rsp = (struct iscsi_targ_login_rsp *) login->rsp; 762 payload_length = ntoh24(login_req->dlength); 763 764 login->first_request = 1; 765 login->leading_connection = (!login_req->tsih) ? 1 : 0; 766 login->current_stage = 767 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2; 768 login->version_min = login_req->min_version; 769 login->version_max = login_req->max_version; 770 memcpy(login->isid, login_req->isid, 6); 771 login->cmd_sn = login_req->cmdsn; 772 login->init_task_tag = login_req->itt; 773 login->initial_exp_statsn = login_req->exp_statsn; 774 login->cid = login_req->cid; 775 login->tsih = login_req->tsih; 776 777 if (iscsi_target_get_initial_payload(conn, login) < 0) 778 return -1; 779 780 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL); 781 if (!tmpbuf) { 782 pr_err("Unable to allocate memory for tmpbuf.\n"); 783 return -1; 784 } 785 786 memcpy(tmpbuf, login->req_buf, payload_length); 787 tmpbuf[payload_length] = '\0'; 788 start = tmpbuf; 789 end = (start + payload_length); 790 791 /* 792 * Locate the initial keys expected from the Initiator node in 793 * the first login request in order to progress with the login phase. 794 */ 795 while (start < end) { 796 if (iscsi_extract_key_value(start, &key, &value) < 0) { 797 ret = -1; 798 goto out; 799 } 800 801 if (!strncmp(key, "InitiatorName", 13)) 802 i_buf = value; 803 else if (!strncmp(key, "SessionType", 11)) 804 s_buf = value; 805 else if (!strncmp(key, "TargetName", 10)) 806 t_buf = value; 807 808 start += strlen(key) + strlen(value) + 2; 809 } 810 811 /* 812 * See 5.3. Login Phase. 813 */ 814 if (!i_buf) { 815 pr_err("InitiatorName key not received" 816 " in first login request.\n"); 817 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 818 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 819 ret = -1; 820 goto out; 821 } 822 /* 823 * Convert the incoming InitiatorName to lowercase following 824 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 825 * are NOT case sensitive. 826 */ 827 iscsi_initiatorname_tolower(i_buf); 828 829 if (!s_buf) { 830 if (!login->leading_connection) 831 goto get_target; 832 833 pr_err("SessionType key not received" 834 " in first login request.\n"); 835 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 836 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 837 ret = -1; 838 goto out; 839 } 840 841 /* 842 * Use default portal group for discovery sessions. 843 */ 844 sessiontype = strncmp(s_buf, DISCOVERY, 9); 845 if (!sessiontype) { 846 conn->tpg = iscsit_global->discovery_tpg; 847 if (!login->leading_connection) 848 goto get_target; 849 850 sess->sess_ops->SessionType = 1; 851 /* 852 * Setup crc32c modules from libcrypto 853 */ 854 if (iscsi_login_setup_crypto(conn) < 0) { 855 pr_err("iscsi_login_setup_crypto() failed\n"); 856 ret = -1; 857 goto out; 858 } 859 /* 860 * Serialize access across the discovery struct iscsi_portal_group to 861 * process login attempt. 862 */ 863 if (iscsit_access_np(np, conn->tpg) < 0) { 864 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 865 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 866 ret = -1; 867 goto out; 868 } 869 ret = 0; 870 goto out; 871 } 872 873 get_target: 874 if (!t_buf) { 875 pr_err("TargetName key not received" 876 " in first login request while" 877 " SessionType=Normal.\n"); 878 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 879 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 880 ret = -1; 881 goto out; 882 } 883 884 /* 885 * Locate Target IQN from Storage Node. 886 */ 887 tiqn = iscsit_get_tiqn_for_login(t_buf); 888 if (!tiqn) { 889 pr_err("Unable to locate Target IQN: %s in" 890 " Storage Node\n", t_buf); 891 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 892 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 893 ret = -1; 894 goto out; 895 } 896 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 897 898 /* 899 * Locate Target Portal Group from Storage Node. 900 */ 901 conn->tpg = iscsit_get_tpg_from_np(tiqn, np); 902 if (!conn->tpg) { 903 pr_err("Unable to locate Target Portal Group" 904 " on %s\n", tiqn->tiqn); 905 iscsit_put_tiqn_for_login(tiqn); 906 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 907 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 908 ret = -1; 909 goto out; 910 } 911 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 912 /* 913 * Setup crc32c modules from libcrypto 914 */ 915 if (iscsi_login_setup_crypto(conn) < 0) { 916 pr_err("iscsi_login_setup_crypto() failed\n"); 917 ret = -1; 918 goto out; 919 } 920 /* 921 * Serialize access across the struct iscsi_portal_group to 922 * process login attempt. 923 */ 924 if (iscsit_access_np(np, conn->tpg) < 0) { 925 iscsit_put_tiqn_for_login(tiqn); 926 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 927 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 928 ret = -1; 929 conn->tpg = NULL; 930 goto out; 931 } 932 933 /* 934 * conn->sess->node_acl will be set when the referenced 935 * struct iscsi_session is located from received ISID+TSIH in 936 * iscsi_login_non_zero_tsih_s2(). 937 */ 938 if (!login->leading_connection) { 939 ret = 0; 940 goto out; 941 } 942 943 /* 944 * This value is required in iscsi_login_zero_tsih_s2() 945 */ 946 sess->sess_ops->SessionType = 0; 947 948 /* 949 * Locate incoming Initiator IQN reference from Storage Node. 950 */ 951 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 952 &conn->tpg->tpg_se_tpg, i_buf); 953 if (!sess->se_sess->se_node_acl) { 954 pr_err("iSCSI Initiator Node: %s is not authorized to" 955 " access iSCSI target portal group: %hu.\n", 956 i_buf, conn->tpg->tpgt); 957 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 958 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 959 ret = -1; 960 goto out; 961 } 962 963 ret = 0; 964 out: 965 kfree(tmpbuf); 966 return ret; 967 } 968 969 struct iscsi_login *iscsi_target_init_negotiation( 970 struct iscsi_np *np, 971 struct iscsi_conn *conn, 972 char *login_pdu) 973 { 974 struct iscsi_login *login; 975 976 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL); 977 if (!login) { 978 pr_err("Unable to allocate memory for struct iscsi_login.\n"); 979 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 980 ISCSI_LOGIN_STATUS_NO_RESOURCES); 981 return NULL; 982 } 983 984 login->req = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL); 985 if (!login->req) { 986 pr_err("Unable to allocate memory for Login Request.\n"); 987 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 988 ISCSI_LOGIN_STATUS_NO_RESOURCES); 989 goto out; 990 } 991 memcpy(login->req, login_pdu, ISCSI_HDR_LEN); 992 993 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); 994 if (!login->req_buf) { 995 pr_err("Unable to allocate memory for response buffer.\n"); 996 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 997 ISCSI_LOGIN_STATUS_NO_RESOURCES); 998 goto out; 999 } 1000 /* 1001 * SessionType: Discovery 1002 * 1003 * Locates Default Portal 1004 * 1005 * SessionType: Normal 1006 * 1007 * Locates Target Portal from NP -> Target IQN 1008 */ 1009 if (iscsi_target_locate_portal(np, conn, login) < 0) { 1010 pr_err("iSCSI Login negotiation failed.\n"); 1011 goto out; 1012 } 1013 1014 return login; 1015 out: 1016 kfree(login->req); 1017 kfree(login->req_buf); 1018 kfree(login); 1019 1020 return NULL; 1021 } 1022 1023 int iscsi_target_start_negotiation( 1024 struct iscsi_login *login, 1025 struct iscsi_conn *conn) 1026 { 1027 int ret = -1; 1028 1029 login->rsp = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL); 1030 if (!login->rsp) { 1031 pr_err("Unable to allocate memory for" 1032 " Login Response.\n"); 1033 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1034 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1035 ret = -1; 1036 goto out; 1037 } 1038 1039 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); 1040 if (!login->rsp_buf) { 1041 pr_err("Unable to allocate memory for" 1042 " request buffer.\n"); 1043 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1044 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1045 ret = -1; 1046 goto out; 1047 } 1048 1049 ret = iscsi_target_do_login(conn, login); 1050 out: 1051 if (ret != 0) 1052 iscsi_remove_failed_auth_entry(conn); 1053 1054 iscsi_target_nego_release(login, conn); 1055 return ret; 1056 } 1057 1058 void iscsi_target_nego_release( 1059 struct iscsi_login *login, 1060 struct iscsi_conn *conn) 1061 { 1062 kfree(login->req); 1063 kfree(login->rsp); 1064 kfree(login->req_buf); 1065 kfree(login->rsp_buf); 1066 kfree(login); 1067 } 1068