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[deliverable/linux.git] / 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 }
Linux kernel - Deliverables
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