drivers/target/iscsi/iscsi_target_nego.c

   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                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 625                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 626                 return -1;
 627         }
 628
 629         if (login->first_request)
 630                 if (iscsi_target_check_first_request(conn, login) < 0)
 631                         return -1;
 632
 633         if (iscsi_target_check_for_existing_instances(conn, login) < 0)
 634                 return -1;
 635
 636         ret = iscsi_encode_text_output(
 637                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 638                         SENDER_TARGET,
 639                         login->rsp_buf,
 640                         &login->rsp_length,
 641                         conn->param_list);
 642         if (ret < 0) {
 643                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 644                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 645                 return -1;
 646         }
 647
 648         if (!login->auth_complete &&
 649              ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication) {
 650                 pr_err("Initiator is requesting CSG: 1, has not been"
 651                          " successfully authenticated, and the Target is"
 652                         " enforcing iSCSI Authentication, login failed.\n");
 653                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 654                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 655                 return -1;
 656         }
 657
 658         if (!iscsi_check_negotiated_keys(conn->param_list))
 659                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
 660                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
 661                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
 662                                             ISCSI_FLAG_LOGIN_TRANSIT;
 663
 664         return 0;
 665 }
 666
 667 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
 668 {
 669         int pdu_count = 0;
 670         struct iscsi_login_req *login_req;
 671         struct iscsi_login_rsp *login_rsp;
 672
 673         login_req = (struct iscsi_login_req *) login->req;
 674         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 675
 676         while (1) {
 677                 if (++pdu_count > MAX_LOGIN_PDUS) {
 678                         pr_err("MAX_LOGIN_PDUS count reached.\n");
 679                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 680                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 681                         return -1;
 682                 }
 683
 684                 switch ((login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2) {
 685                 case 0:
 686                         login_rsp->flags |= (0 & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK);
 687                         if (iscsi_target_handle_csg_zero(conn, login) < 0)
 688                                 return -1;
 689                         break;
 690                 case 1:
 691                         login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
 692                         if (iscsi_target_handle_csg_one(conn, login) < 0)
 693                                 return -1;
 694                         if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
 695                                 login->tsih = conn->sess->tsih;
 696                                 if (iscsi_target_do_tx_login_io(conn,
 697                                                 login) < 0)
 698                                         return -1;
 699                                 return 0;
 700                         }
 701                         break;
 702                 default:
 703                         pr_err("Illegal CSG: %d received from"
 704                                 " Initiator, protocol error.\n",
 705                                 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
 706                                 >> 2);
 707                         break;
 708                 }
 709
 710                 if (iscsi_target_do_login_io(conn, login) < 0)
 711                         return -1;
 712
 713                 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
 714                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
 715                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
 716                 }
 717         }
 718
 719         return 0;
 720 }
 721
 722 static void iscsi_initiatorname_tolower(
 723         char *param_buf)
 724 {
 725         char *c;
 726         u32 iqn_size = strlen(param_buf), i;
 727
 728         for (i = 0; i < iqn_size; i++) {
 729                 c = &param_buf[i];
 730                 if (!isupper(*c))
 731                         continue;
 732
 733                 *c = tolower(*c);
 734         }
 735 }
 736
 737 /*
 738  * Processes the first Login Request..
 739  */
 740 static int iscsi_target_locate_portal(
 741         struct iscsi_np *np,
 742         struct iscsi_conn *conn,
 743         struct iscsi_login *login)
 744 {
 745         char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
 746         char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
 747         struct iscsi_session *sess = conn->sess;
 748         struct iscsi_tiqn *tiqn;
 749         struct iscsi_login_req *login_req;
 750         u32 payload_length;
 751         int sessiontype = 0, ret = 0;
 752
 753         login_req = (struct iscsi_login_req *) login->req;
 754         payload_length = ntoh24(login_req->dlength);
 755
 756         login->first_request    = 1;
 757         login->leading_connection = (!login_req->tsih) ? 1 : 0;
 758         login->current_stage    =
 759                 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
 760         login->version_min      = login_req->min_version;
 761         login->version_max      = login_req->max_version;
 762         memcpy(login->isid, login_req->isid, 6);
 763         login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
 764         login->init_task_tag    = login_req->itt;
 765         login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
 766         login->cid              = be16_to_cpu(login_req->cid);
 767         login->tsih             = be16_to_cpu(login_req->tsih);
 768
 769         if (iscsi_target_get_initial_payload(conn, login) < 0)
 770                 return -1;
 771
 772         tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
 773         if (!tmpbuf) {
 774                 pr_err("Unable to allocate memory for tmpbuf.\n");
 775                 return -1;
 776         }
 777
 778         memcpy(tmpbuf, login->req_buf, payload_length);
 779         tmpbuf[payload_length] = '\0';
 780         start = tmpbuf;
 781         end = (start + payload_length);
 782
 783         /*
 784          * Locate the initial keys expected from the Initiator node in
 785          * the first login request in order to progress with the login phase.
 786          */
 787         while (start < end) {
 788                 if (iscsi_extract_key_value(start, &key, &value) < 0) {
 789                         ret = -1;
 790                         goto out;
 791                 }
 792
 793                 if (!strncmp(key, "InitiatorName", 13))
 794                         i_buf = value;
 795                 else if (!strncmp(key, "SessionType", 11))
 796                         s_buf = value;
 797                 else if (!strncmp(key, "TargetName", 10))
 798                         t_buf = value;
 799
 800                 start += strlen(key) + strlen(value) + 2;
 801         }
 802
 803         /*
 804          * See 5.3.  Login Phase.
 805          */
 806         if (!i_buf) {
 807                 pr_err("InitiatorName key not received"
 808                         " in first login request.\n");
 809                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 810                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 811                 ret = -1;
 812                 goto out;
 813         }
 814         /*
 815          * Convert the incoming InitiatorName to lowercase following
 816          * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
 817          * are NOT case sensitive.
 818          */
 819         iscsi_initiatorname_tolower(i_buf);
 820
 821         if (!s_buf) {
 822                 if (!login->leading_connection)
 823                         goto get_target;
 824
 825                 pr_err("SessionType key not received"
 826                         " in first login request.\n");
 827                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 828                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 829                 ret = -1;
 830                 goto out;
 831         }
 832
 833         /*
 834          * Use default portal group for discovery sessions.
 835          */
 836         sessiontype = strncmp(s_buf, DISCOVERY, 9);
 837         if (!sessiontype) {
 838                 conn->tpg = iscsit_global->discovery_tpg;
 839                 if (!login->leading_connection)
 840                         goto get_target;
 841
 842                 sess->sess_ops->SessionType = 1;
 843                 /*
 844                  * Setup crc32c modules from libcrypto
 845                  */
 846                 if (iscsi_login_setup_crypto(conn) < 0) {
 847                         pr_err("iscsi_login_setup_crypto() failed\n");
 848                         ret = -1;
 849                         goto out;
 850                 }
 851                 /*
 852                  * Serialize access across the discovery struct iscsi_portal_group to
 853                  * process login attempt.
 854                  */
 855                 if (iscsit_access_np(np, conn->tpg) < 0) {
 856                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 857                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
 858                         ret = -1;
 859                         goto out;
 860                 }
 861                 ret = 0;
 862                 goto out;
 863         }
 864
 865 get_target:
 866         if (!t_buf) {
 867                 pr_err("TargetName key not received"
 868                         " in first login request while"
 869                         " SessionType=Normal.\n");
 870                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 871                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 872                 ret = -1;
 873                 goto out;
 874         }
 875
 876         /*
 877          * Locate Target IQN from Storage Node.
 878          */
 879         tiqn = iscsit_get_tiqn_for_login(t_buf);
 880         if (!tiqn) {
 881                 pr_err("Unable to locate Target IQN: %s in"
 882                         " Storage Node\n", t_buf);
 883                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 884                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
 885                 ret = -1;
 886                 goto out;
 887         }
 888         pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
 889
 890         /*
 891          * Locate Target Portal Group from Storage Node.
 892          */
 893         conn->tpg = iscsit_get_tpg_from_np(tiqn, np);
 894         if (!conn->tpg) {
 895                 pr_err("Unable to locate Target Portal Group"
 896                                 " on %s\n", tiqn->tiqn);
 897                 iscsit_put_tiqn_for_login(tiqn);
 898                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 899                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
 900                 ret = -1;
 901                 goto out;
 902         }
 903         pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
 904         /*
 905          * Setup crc32c modules from libcrypto
 906          */
 907         if (iscsi_login_setup_crypto(conn) < 0) {
 908                 pr_err("iscsi_login_setup_crypto() failed\n");
 909                 ret = -1;
 910                 goto out;
 911         }
 912         /*
 913          * Serialize access across the struct iscsi_portal_group to
 914          * process login attempt.
 915          */
 916         if (iscsit_access_np(np, conn->tpg) < 0) {
 917                 iscsit_put_tiqn_for_login(tiqn);
 918                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 919                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
 920                 ret = -1;
 921                 conn->tpg = NULL;
 922                 goto out;
 923         }
 924
 925         /*
 926          * conn->sess->node_acl will be set when the referenced
 927          * struct iscsi_session is located from received ISID+TSIH in
 928          * iscsi_login_non_zero_tsih_s2().
 929          */
 930         if (!login->leading_connection) {
 931                 ret = 0;
 932                 goto out;
 933         }
 934
 935         /*
 936          * This value is required in iscsi_login_zero_tsih_s2()
 937          */
 938         sess->sess_ops->SessionType = 0;
 939
 940         /*
 941          * Locate incoming Initiator IQN reference from Storage Node.
 942          */
 943         sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
 944                         &conn->tpg->tpg_se_tpg, i_buf);
 945         if (!sess->se_sess->se_node_acl) {
 946                 pr_err("iSCSI Initiator Node: %s is not authorized to"
 947                         " access iSCSI target portal group: %hu.\n",
 948                                 i_buf, conn->tpg->tpgt);
 949                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 950                                 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
 951                 ret = -1;
 952                 goto out;
 953         }
 954
 955         ret = 0;
 956 out:
 957         kfree(tmpbuf);
 958         return ret;
 959 }
 960
 961 struct iscsi_login *iscsi_target_init_negotiation(
 962         struct iscsi_np *np,
 963         struct iscsi_conn *conn,
 964         char *login_pdu)
 965 {
 966         struct iscsi_login *login;
 967
 968         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
 969         if (!login) {
 970                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
 971                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 972                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 973                 return NULL;
 974         }
 975
 976         login->req = kmemdup(login_pdu, ISCSI_HDR_LEN, GFP_KERNEL);
 977         if (!login->req) {
 978                 pr_err("Unable to allocate memory for Login Request.\n");
 979                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 980                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 981                 goto out;
 982         }
 983
 984         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
 985         if (!login->req_buf) {
 986                 pr_err("Unable to allocate memory for response buffer.\n");
 987                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 988                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 989                 goto out;
 990         }
 991         /*
 992          * SessionType: Discovery
 993          *
 994          *      Locates Default Portal
 995          *
 996          * SessionType: Normal
 997          *
 998          *      Locates Target Portal from NP -> Target IQN
 999          */
1000         if (iscsi_target_locate_portal(np, conn, login) < 0) {
1001                 goto out;
1002         }
1003
1004         return login;
1005 out:
1006         kfree(login->req);
1007         kfree(login->req_buf);
1008         kfree(login);
1009
1010         return NULL;
1011 }
1012
1013 int iscsi_target_start_negotiation(
1014         struct iscsi_login *login,
1015         struct iscsi_conn *conn)
1016 {
1017         int ret = -1;
1018
1019         login->rsp = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
1020         if (!login->rsp) {
1021                 pr_err("Unable to allocate memory for"
1022                                 " Login Response.\n");
1023                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1024                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1025                 ret = -1;
1026                 goto out;
1027         }
1028
1029         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
1030         if (!login->rsp_buf) {
1031                 pr_err("Unable to allocate memory for"
1032                         " request buffer.\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         ret = iscsi_target_do_login(conn, login);
1040 out:
1041         if (ret != 0)
1042                 iscsi_remove_failed_auth_entry(conn);
1043
1044         iscsi_target_nego_release(login, conn);
1045         return ret;
1046 }
1047
1048 void iscsi_target_nego_release(
1049         struct iscsi_login *login,
1050         struct iscsi_conn *conn)
1051 {
1052         kfree(login->req);
1053         kfree(login->rsp);
1054         kfree(login->req_buf);
1055         kfree(login->rsp_buf);
1056         kfree(login);
1057 }