?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 3.4.102
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target_nego.c
blob89f89092b5f23f9c394ab1dea7e2ad04d2cd5690
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 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 = cpu_to_be32(login->init_task_tag);
343 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
344 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
345 login_rsp->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
346
347 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
348 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
349 " %u\n", login_rsp->flags, ntohl(login_rsp->itt),
350 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
351 ntohl(login_rsp->statsn), login->rsp_length);
352
353 padding = ((-login->rsp_length) & 3);
354
355 if (iscsi_login_tx_data(
356 conn,
357 login->rsp,
358 login->rsp_buf,
359 login->rsp_length + padding) < 0)
360 return -1;
361
362 login->rsp_length = 0;
363 login_rsp->tsih = be16_to_cpu(login_rsp->tsih);
364 login_rsp->itt = be32_to_cpu(login_rsp->itt);
365 login_rsp->statsn = be32_to_cpu(login_rsp->statsn);
366 mutex_lock(&sess->cmdsn_mutex);
367 login_rsp->exp_cmdsn = be32_to_cpu(sess->exp_cmd_sn);
368 login_rsp->max_cmdsn = be32_to_cpu(sess->max_cmd_sn);
369 mutex_unlock(&sess->cmdsn_mutex);
370
371 return 0;
372 }
373
374 static int iscsi_target_do_rx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
375 {
376 u32 padding = 0, payload_length;
377 struct iscsi_login_req *login_req;
378
379 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
380 return -1;
381
382 login_req = (struct iscsi_login_req *) login->req;
383 payload_length = ntoh24(login_req->dlength);
384 login_req->tsih = be16_to_cpu(login_req->tsih);
385 login_req->itt = be32_to_cpu(login_req->itt);
386 login_req->cid = be16_to_cpu(login_req->cid);
387 login_req->cmdsn = be32_to_cpu(login_req->cmdsn);
388 login_req->exp_statsn = be32_to_cpu(login_req->exp_statsn);
389
390 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
391 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
392 login_req->flags, login_req->itt, login_req->cmdsn,
393 login_req->exp_statsn, login_req->cid, payload_length);
394
395 if (iscsi_target_check_login_request(conn, login) < 0)
396 return -1;
397
398 padding = ((-payload_length) & 3);
399 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
400
401 if (iscsi_login_rx_data(
402 conn,
403 login->req_buf,
404 payload_length + padding) < 0)
405 return -1;
406
407 return 0;
408 }
409
410 static int iscsi_target_do_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
411 {
412 if (iscsi_target_do_tx_login_io(conn, login) < 0)
413 return -1;
414
415 if (iscsi_target_do_rx_login_io(conn, login) < 0)
416 return -1;
417
418 return 0;
419 }
420
421 static int iscsi_target_get_initial_payload(
422 struct iscsi_conn *conn,
423 struct iscsi_login *login)
424 {
425 u32 padding = 0, payload_length;
426 struct iscsi_login_req *login_req;
427
428 login_req = (struct iscsi_login_req *) login->req;
429 payload_length = ntoh24(login_req->dlength);
430
431 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
432 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
433 login_req->flags, login_req->itt, login_req->cmdsn,
434 login_req->exp_statsn, payload_length);
435
436 if (iscsi_target_check_login_request(conn, login) < 0)
437 return -1;
438
439 padding = ((-payload_length) & 3);
440
441 if (iscsi_login_rx_data(
442 conn,
443 login->req_buf,
444 payload_length + padding) < 0)
445 return -1;
446
447 return 0;
448 }
449
450 /*
451 * NOTE: We check for existing sessions or connections AFTER the initiator
452 * has been successfully authenticated in order to protect against faked
453 * ISID/TSIH combinations.
454 */
455 static int iscsi_target_check_for_existing_instances(
456 struct iscsi_conn *conn,
457 struct iscsi_login *login)
458 {
459 if (login->checked_for_existing)
460 return 0;
461
462 login->checked_for_existing = 1;
463
464 if (!login->tsih)
465 return iscsi_check_for_session_reinstatement(conn);
466 else
467 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
468 login->initial_exp_statsn);
469 }
470
471 static int iscsi_target_do_authentication(
472 struct iscsi_conn *conn,
473 struct iscsi_login *login)
474 {
475 int authret;
476 u32 payload_length;
477 struct iscsi_param *param;
478 struct iscsi_login_req *login_req;
479 struct iscsi_login_rsp *login_rsp;
480
481 login_req = (struct iscsi_login_req *) login->req;
482 login_rsp = (struct iscsi_login_rsp *) login->rsp;
483 payload_length = ntoh24(login_req->dlength);
484
485 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
486 if (!param)
487 return -1;
488
489 authret = iscsi_handle_authentication(
490 conn,
491 login->req_buf,
492 login->rsp_buf,
493 payload_length,
494 &login->rsp_length,
495 param->value);
496 switch (authret) {
497 case 0:
498 pr_debug("Received OK response"
499 " from LIO Authentication, continuing.\n");
500 break;
501 case 1:
502 pr_debug("iSCSI security negotiation"
503 " completed successfully.\n");
504 login->auth_complete = 1;
505 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
506 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
507 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
508 ISCSI_FLAG_LOGIN_TRANSIT);
509 login->current_stage = 1;
510 }
511 return iscsi_target_check_for_existing_instances(
512 conn, login);
513 case 2:
514 pr_err("Security negotiation"
515 " failed.\n");
516 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
517 ISCSI_LOGIN_STATUS_AUTH_FAILED);
518 return -1;
519 default:
520 pr_err("Received unknown error %d from LIO"
521 " Authentication\n", authret);
522 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
523 ISCSI_LOGIN_STATUS_TARGET_ERROR);
524 return -1;
525 }
526
527 return 0;
528 }
529
530 static int iscsi_target_handle_csg_zero(
531 struct iscsi_conn *conn,
532 struct iscsi_login *login)
533 {
534 int ret;
535 u32 payload_length;
536 struct iscsi_param *param;
537 struct iscsi_login_req *login_req;
538 struct iscsi_login_rsp *login_rsp;
539
540 login_req = (struct iscsi_login_req *) login->req;
541 login_rsp = (struct iscsi_login_rsp *) login->rsp;
542 payload_length = ntoh24(login_req->dlength);
543
544 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
545 if (!param)
546 return -1;
547
548 ret = iscsi_decode_text_input(
549 PHASE_SECURITY|PHASE_DECLARATIVE,
550 SENDER_INITIATOR|SENDER_RECEIVER,
551 login->req_buf,
552 payload_length,
553 conn->param_list);
554 if (ret < 0)
555 return -1;
556
557 if (ret > 0) {
558 if (login->auth_complete) {
559 pr_err("Initiator has already been"
560 " successfully authenticated, but is still"
561 " sending %s keys.\n", param->value);
562 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
563 ISCSI_LOGIN_STATUS_INIT_ERR);
564 return -1;
565 }
566
567 goto do_auth;
568 }
569
570 if (login->first_request)
571 if (iscsi_target_check_first_request(conn, login) < 0)
572 return -1;
573
574 ret = iscsi_encode_text_output(
575 PHASE_SECURITY|PHASE_DECLARATIVE,
576 SENDER_TARGET,
577 login->rsp_buf,
578 &login->rsp_length,
579 conn->param_list);
580 if (ret < 0)
581 return -1;
582
583 if (!iscsi_check_negotiated_keys(conn->param_list)) {
584 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication &&
585 !strncmp(param->value, NONE, 4)) {
586 pr_err("Initiator sent AuthMethod=None but"
587 " Target is enforcing iSCSI Authentication,"
588 " login failed.\n");
589 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
590 ISCSI_LOGIN_STATUS_AUTH_FAILED);
591 return -1;
592 }
593
594 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication &&
595 !login->auth_complete)
596 return 0;
597
598 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
599 return 0;
600
601 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
602 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
603 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
604 ISCSI_FLAG_LOGIN_TRANSIT;
605 login->current_stage = 1;
606 }
607 }
608
609 return 0;
610 do_auth:
611 return iscsi_target_do_authentication(conn, login);
612 }
613
614 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
615 {
616 int ret;
617 u32 payload_length;
618 struct iscsi_login_req *login_req;
619 struct iscsi_login_rsp *login_rsp;
620
621 login_req = (struct iscsi_login_req *) login->req;
622 login_rsp = (struct iscsi_login_rsp *) login->rsp;
623 payload_length = ntoh24(login_req->dlength);
624
625 ret = iscsi_decode_text_input(
626 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
627 SENDER_INITIATOR|SENDER_RECEIVER,
628 login->req_buf,
629 payload_length,
630 conn->param_list);
631 if (ret < 0) {
632 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
633 ISCSI_LOGIN_STATUS_INIT_ERR);
634 return -1;
635 }
636
637 if (login->first_request)
638 if (iscsi_target_check_first_request(conn, login) < 0)
639 return -1;
640
641 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
642 return -1;
643
644 ret = iscsi_encode_text_output(
645 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
646 SENDER_TARGET,
647 login->rsp_buf,
648 &login->rsp_length,
649 conn->param_list);
650 if (ret < 0) {
651 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
652 ISCSI_LOGIN_STATUS_INIT_ERR);
653 return -1;
654 }
655
656 if (!login->auth_complete &&
657 ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication) {
658 pr_err("Initiator is requesting CSG: 1, has not been"
659 " successfully authenticated, and the Target is"
660 " enforcing iSCSI Authentication, login failed.\n");
661 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
662 ISCSI_LOGIN_STATUS_AUTH_FAILED);
663 return -1;
664 }
665
666 if (!iscsi_check_negotiated_keys(conn->param_list))
667 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
668 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
669 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
670 ISCSI_FLAG_LOGIN_TRANSIT;
671
672 return 0;
673 }
674
675 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
676 {
677 int pdu_count = 0;
678 struct iscsi_login_req *login_req;
679 struct iscsi_login_rsp *login_rsp;
680
681 login_req = (struct iscsi_login_req *) login->req;
682 login_rsp = (struct iscsi_login_rsp *) login->rsp;
683
684 while (1) {
685 if (++pdu_count > MAX_LOGIN_PDUS) {
686 pr_err("MAX_LOGIN_PDUS count reached.\n");
687 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
688 ISCSI_LOGIN_STATUS_TARGET_ERROR);
689 return -1;
690 }
691
692 switch ((login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2) {
693 case 0:
694 login_rsp->flags |= (0 & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK);
695 if (iscsi_target_handle_csg_zero(conn, login) < 0)
696 return -1;
697 break;
698 case 1:
699 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
700 if (iscsi_target_handle_csg_one(conn, login) < 0)
701 return -1;
702 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
703 login->tsih = conn->sess->tsih;
704 if (iscsi_target_do_tx_login_io(conn,
705 login) < 0)
706 return -1;
707 return 0;
708 }
709 break;
710 default:
711 pr_err("Illegal CSG: %d received from"
712 " Initiator, protocol error.\n",
713 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
714 >> 2);
715 break;
716 }
717
718 if (iscsi_target_do_login_io(conn, login) < 0)
719 return -1;
720
721 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
722 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
723 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
724 }
725 }
726
727 return 0;
728 }
729
730 static void iscsi_initiatorname_tolower(
731 char *param_buf)
732 {
733 char *c;
734 u32 iqn_size = strlen(param_buf), i;
735
736 for (i = 0; i < iqn_size; i++) {
737 c = &param_buf[i];
738 if (!isupper(*c))
739 continue;
740
741 *c = tolower(*c);
742 }
743 }
744
745 /*
746 * Processes the first Login Request..
747 */
748 static int iscsi_target_locate_portal(
749 struct iscsi_np *np,
750 struct iscsi_conn *conn,
751 struct iscsi_login *login)
752 {
753 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
754 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
755 struct iscsi_session *sess = conn->sess;
756 struct iscsi_tiqn *tiqn;
757 struct iscsi_login_req *login_req;
758 u32 payload_length;
759 int sessiontype = 0, ret = 0;
760
761 login_req = (struct iscsi_login_req *) login->req;
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 = kmemdup(login_pdu, 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
992 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
993 if (!login->req_buf) {
994 pr_err("Unable to allocate memory for response buffer.\n");
995 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
996 ISCSI_LOGIN_STATUS_NO_RESOURCES);
997 goto out;
998 }
999 /*
1000 * SessionType: Discovery
1001 *
1002 * Locates Default Portal
1003 *
1004 * SessionType: Normal
1005 *
1006 * Locates Target Portal from NP -> Target IQN
1007 */
1008 if (iscsi_target_locate_portal(np, conn, login) < 0) {
1009 pr_err("iSCSI Login negotiation failed.\n");
1010 goto out;
1011 }
1012
1013 return login;
1014 out:
1015 kfree(login->req);
1016 kfree(login->req_buf);
1017 kfree(login);
1018
1019 return NULL;
1020 }
1021
1022 int iscsi_target_start_negotiation(
1023 struct iscsi_login *login,
1024 struct iscsi_conn *conn)
1025 {
1026 int ret = -1;
1027
1028 login->rsp = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
1029 if (!login->rsp) {
1030 pr_err("Unable to allocate memory for"
1031 " Login Response.\n");
1032 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1033 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1034 ret = -1;
1035 goto out;
1036 }
1037
1038 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
1039 if (!login->rsp_buf) {
1040 pr_err("Unable to allocate memory for"
1041 " request buffer.\n");
1042 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1043 ISCSI_LOGIN_STATUS_NO_RESOURCES);
1044 ret = -1;
1045 goto out;
1046 }
1047
1048 ret = iscsi_target_do_login(conn, login);
1049 out:
1050 if (ret != 0)
1051 iscsi_remove_failed_auth_entry(conn);
1052
1053 iscsi_target_nego_release(login, conn);
1054 return ret;
1055 }
1056
1057 void iscsi_target_nego_release(
1058 struct iscsi_login *login,
1059 struct iscsi_conn *conn)
1060 {
1061 kfree(login->req);
1062 kfree(login->rsp);
1063 kfree(login->req_buf);
1064 kfree(login->rsp_buf);
1065 kfree(login);
1066 }
Linux with added FPC-III support