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 #include <target/iscsi/iscsi_transport.h>
26
27 #include "iscsi_target_core.h"
28 #include "iscsi_target_parameters.h"
29 #include "iscsi_target_login.h"
30 #include "iscsi_target_nego.h"
31 #include "iscsi_target_tpg.h"
32 #include "iscsi_target_util.h"
33 #include "iscsi_target.h"
34 #include "iscsi_target_auth.h"
35
36 #define MAX_LOGIN_PDUS 7
37 #define TEXT_LEN 4096
38
convert_null_to_semi(char * buf,int len)39 void convert_null_to_semi(char *buf, int len)
40 {
41 int i;
42
43 for (i = 0; i < len; i++)
44 if (buf[i] == '\0')
45 buf[i] = ';';
46 }
47
strlen_semi(char * buf)48 static int strlen_semi(char *buf)
49 {
50 int i = 0;
51
52 while (buf[i] != '\0') {
53 if (buf[i] == ';')
54 return i;
55 i++;
56 }
57
58 return -1;
59 }
60
extract_param(const char * in_buf,const char * pattern,unsigned int max_length,char * out_buf,unsigned char * type)61 int extract_param(
62 const char *in_buf,
63 const char *pattern,
64 unsigned int max_length,
65 char *out_buf,
66 unsigned char *type)
67 {
68 char *ptr;
69 int len;
70
71 if (!in_buf || !pattern || !out_buf || !type)
72 return -1;
73
74 ptr = strstr(in_buf, pattern);
75 if (!ptr)
76 return -1;
77
78 ptr = strstr(ptr, "=");
79 if (!ptr)
80 return -1;
81
82 ptr += 1;
83 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
84 ptr += 2; /* skip 0x */
85 *type = HEX;
86 } else
87 *type = DECIMAL;
88
89 len = strlen_semi(ptr);
90 if (len < 0)
91 return -1;
92
93 if (len > max_length) {
94 pr_err("Length of input: %d exceeds max_length:"
95 " %d\n", len, max_length);
96 return -1;
97 }
98 memcpy(out_buf, ptr, len);
99 out_buf[len] = '\0';
100
101 return 0;
102 }
103
iscsi_handle_authentication(struct iscsi_conn * conn,char * in_buf,char * out_buf,int in_length,int * out_length,unsigned char * authtype)104 static u32 iscsi_handle_authentication(
105 struct iscsi_conn *conn,
106 char *in_buf,
107 char *out_buf,
108 int in_length,
109 int *out_length,
110 unsigned char *authtype)
111 {
112 struct iscsi_session *sess = conn->sess;
113 struct iscsi_node_auth *auth;
114 struct iscsi_node_acl *iscsi_nacl;
115 struct se_node_acl *se_nacl;
116
117 if (!sess->sess_ops->SessionType) {
118 /*
119 * For SessionType=Normal
120 */
121 se_nacl = conn->sess->se_sess->se_node_acl;
122 if (!se_nacl) {
123 pr_err("Unable to locate struct se_node_acl for"
124 " CHAP auth\n");
125 return -1;
126 }
127 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
128 se_node_acl);
129 if (!iscsi_nacl) {
130 pr_err("Unable to locate struct iscsi_node_acl for"
131 " CHAP auth\n");
132 return -1;
133 }
134
135 auth = ISCSI_NODE_AUTH(iscsi_nacl);
136 } else {
137 /*
138 * For SessionType=Discovery
139 */
140 auth = &iscsit_global->discovery_acl.node_auth;
141 }
142
143 if (strstr("CHAP", authtype))
144 strcpy(conn->sess->auth_type, "CHAP");
145 else
146 strcpy(conn->sess->auth_type, NONE);
147
148 if (strstr("None", authtype))
149 return 1;
150 #ifdef CANSRP
151 else if (strstr("SRP", authtype))
152 return srp_main_loop(conn, auth, in_buf, out_buf,
153 &in_length, out_length);
154 #endif
155 else if (strstr("CHAP", authtype))
156 return chap_main_loop(conn, auth, in_buf, out_buf,
157 &in_length, out_length);
158 else if (strstr("SPKM1", authtype))
159 return 2;
160 else if (strstr("SPKM2", authtype))
161 return 2;
162 else if (strstr("KRB5", authtype))
163 return 2;
164 else
165 return 2;
166 }
167
iscsi_remove_failed_auth_entry(struct iscsi_conn * conn)168 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
169 {
170 kfree(conn->auth_protocol);
171 }
172
iscsi_target_check_login_request(struct iscsi_conn * conn,struct iscsi_login * login)173 int iscsi_target_check_login_request(
174 struct iscsi_conn *conn,
175 struct iscsi_login *login)
176 {
177 int req_csg, req_nsg;
178 u32 payload_length;
179 struct iscsi_login_req *login_req;
180
181 login_req = (struct iscsi_login_req *) login->req;
182 payload_length = ntoh24(login_req->dlength);
183
184 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
185 case ISCSI_OP_LOGIN:
186 break;
187 default:
188 pr_err("Received unknown opcode 0x%02x.\n",
189 login_req->opcode & ISCSI_OPCODE_MASK);
190 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
191 ISCSI_LOGIN_STATUS_INIT_ERR);
192 return -1;
193 }
194
195 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
196 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
197 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
198 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
199 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
200 ISCSI_LOGIN_STATUS_INIT_ERR);
201 return -1;
202 }
203
204 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
205 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
206
207 if (req_csg != login->current_stage) {
208 pr_err("Initiator unexpectedly changed login stage"
209 " from %d to %d, login failed.\n", login->current_stage,
210 req_csg);
211 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
212 ISCSI_LOGIN_STATUS_INIT_ERR);
213 return -1;
214 }
215
216 if ((req_nsg == 2) || (req_csg >= 2) ||
217 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
218 (req_nsg <= req_csg))) {
219 pr_err("Illegal login_req->flags Combination, CSG: %d,"
220 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
221 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
222 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
223 ISCSI_LOGIN_STATUS_INIT_ERR);
224 return -1;
225 }
226
227 if ((login_req->max_version != login->version_max) ||
228 (login_req->min_version != login->version_min)) {
229 pr_err("Login request changed Version Max/Nin"
230 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
231 login_req->max_version, login_req->min_version);
232 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
233 ISCSI_LOGIN_STATUS_INIT_ERR);
234 return -1;
235 }
236
237 if (memcmp(login_req->isid, login->isid, 6) != 0) {
238 pr_err("Login request changed ISID unexpectedly,"
239 " protocol error.\n");
240 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
241 ISCSI_LOGIN_STATUS_INIT_ERR);
242 return -1;
243 }
244
245 if (login_req->itt != login->init_task_tag) {
246 pr_err("Login request changed ITT unexpectedly to"
247 " 0x%08x, protocol error.\n", login_req->itt);
248 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
249 ISCSI_LOGIN_STATUS_INIT_ERR);
250 return -1;
251 }
252
253 if (payload_length > MAX_KEY_VALUE_PAIRS) {
254 pr_err("Login request payload exceeds default"
255 " MaxRecvDataSegmentLength: %u, protocol error.\n",
256 MAX_KEY_VALUE_PAIRS);
257 return -1;
258 }
259
260 return 0;
261 }
262
iscsi_target_check_first_request(struct iscsi_conn * conn,struct iscsi_login * login)263 static int iscsi_target_check_first_request(
264 struct iscsi_conn *conn,
265 struct iscsi_login *login)
266 {
267 struct iscsi_param *param = NULL;
268 struct se_node_acl *se_nacl;
269
270 login->first_request = 0;
271
272 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
273 if (!strncmp(param->name, SESSIONTYPE, 11)) {
274 if (!IS_PSTATE_ACCEPTOR(param)) {
275 pr_err("SessionType key not received"
276 " in first login request.\n");
277 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
278 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
279 return -1;
280 }
281 if (!strncmp(param->value, DISCOVERY, 9))
282 return 0;
283 }
284
285 if (!strncmp(param->name, INITIATORNAME, 13)) {
286 if (!IS_PSTATE_ACCEPTOR(param)) {
287 if (!login->leading_connection)
288 continue;
289
290 pr_err("InitiatorName key not received"
291 " in first login request.\n");
292 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
293 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
294 return -1;
295 }
296
297 /*
298 * For non-leading connections, double check that the
299 * received InitiatorName matches the existing session's
300 * struct iscsi_node_acl.
301 */
302 if (!login->leading_connection) {
303 se_nacl = conn->sess->se_sess->se_node_acl;
304 if (!se_nacl) {
305 pr_err("Unable to locate"
306 " struct se_node_acl\n");
307 iscsit_tx_login_rsp(conn,
308 ISCSI_STATUS_CLS_INITIATOR_ERR,
309 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
310 return -1;
311 }
312
313 if (strcmp(param->value,
314 se_nacl->initiatorname)) {
315 pr_err("Incorrect"
316 " InitiatorName: %s for this"
317 " iSCSI Initiator Node.\n",
318 param->value);
319 iscsit_tx_login_rsp(conn,
320 ISCSI_STATUS_CLS_INITIATOR_ERR,
321 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
322 return -1;
323 }
324 }
325 }
326 }
327
328 return 0;
329 }
330
iscsi_target_do_tx_login_io(struct iscsi_conn * conn,struct iscsi_login * login)331 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
332 {
333 u32 padding = 0;
334 struct iscsi_session *sess = conn->sess;
335 struct iscsi_login_rsp *login_rsp;
336
337 login_rsp = (struct iscsi_login_rsp *) login->rsp;
338
339 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
340 hton24(login_rsp->dlength, login->rsp_length);
341 memcpy(login_rsp->isid, login->isid, 6);
342 login_rsp->tsih = cpu_to_be16(login->tsih);
343 login_rsp->itt = login->init_task_tag;
344 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
345 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
346 login_rsp->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
347
348 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
349 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
350 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
351 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
352 ntohl(login_rsp->statsn), login->rsp_length);
353
354 padding = ((-login->rsp_length) & 3);
355
356 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
357 login->rsp_length + padding) < 0)
358 return -1;
359
360 login->rsp_length = 0;
361 mutex_lock(&sess->cmdsn_mutex);
362 login_rsp->exp_cmdsn = cpu_to_be32(sess->exp_cmd_sn);
363 login_rsp->max_cmdsn = cpu_to_be32(sess->max_cmd_sn);
364 mutex_unlock(&sess->cmdsn_mutex);
365
366 return 0;
367 }
368
iscsi_target_do_login_io(struct iscsi_conn * conn,struct iscsi_login * login)369 static int iscsi_target_do_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
370 {
371 if (iscsi_target_do_tx_login_io(conn, login) < 0)
372 return -1;
373
374 if (conn->conn_transport->iscsit_get_login_rx(conn, login) < 0)
375 return -1;
376
377 return 0;
378 }
379
380 /*
381 * NOTE: We check for existing sessions or connections AFTER the initiator
382 * has been successfully authenticated in order to protect against faked
383 * ISID/TSIH combinations.
384 */
iscsi_target_check_for_existing_instances(struct iscsi_conn * conn,struct iscsi_login * login)385 static int iscsi_target_check_for_existing_instances(
386 struct iscsi_conn *conn,
387 struct iscsi_login *login)
388 {
389 if (login->checked_for_existing)
390 return 0;
391
392 login->checked_for_existing = 1;
393
394 if (!login->tsih)
395 return iscsi_check_for_session_reinstatement(conn);
396 else
397 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
398 login->initial_exp_statsn);
399 }
400
iscsi_target_do_authentication(struct iscsi_conn * conn,struct iscsi_login * login)401 static int iscsi_target_do_authentication(
402 struct iscsi_conn *conn,
403 struct iscsi_login *login)
404 {
405 int authret;
406 u32 payload_length;
407 struct iscsi_param *param;
408 struct iscsi_login_req *login_req;
409 struct iscsi_login_rsp *login_rsp;
410
411 login_req = (struct iscsi_login_req *) login->req;
412 login_rsp = (struct iscsi_login_rsp *) login->rsp;
413 payload_length = ntoh24(login_req->dlength);
414
415 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
416 if (!param)
417 return -1;
418
419 authret = iscsi_handle_authentication(
420 conn,
421 login->req_buf,
422 login->rsp_buf,
423 payload_length,
424 &login->rsp_length,
425 param->value);
426 switch (authret) {
427 case 0:
428 pr_debug("Received OK response"
429 " from LIO Authentication, continuing.\n");
430 break;
431 case 1:
432 pr_debug("iSCSI security negotiation"
433 " completed successfully.\n");
434 login->auth_complete = 1;
435 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
436 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
437 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
438 ISCSI_FLAG_LOGIN_TRANSIT);
439 login->current_stage = 1;
440 }
441 return iscsi_target_check_for_existing_instances(
442 conn, login);
443 case 2:
444 pr_err("Security negotiation"
445 " failed.\n");
446 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
447 ISCSI_LOGIN_STATUS_AUTH_FAILED);
448 return -1;
449 default:
450 pr_err("Received unknown error %d from LIO"
451 " Authentication\n", authret);
452 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
453 ISCSI_LOGIN_STATUS_TARGET_ERROR);
454 return -1;
455 }
456
457 return 0;
458 }
459
iscsi_target_handle_csg_zero(struct iscsi_conn * conn,struct iscsi_login * login)460 static int iscsi_target_handle_csg_zero(
461 struct iscsi_conn *conn,
462 struct iscsi_login *login)
463 {
464 int ret;
465 u32 payload_length;
466 struct iscsi_param *param;
467 struct iscsi_login_req *login_req;
468 struct iscsi_login_rsp *login_rsp;
469
470 login_req = (struct iscsi_login_req *) login->req;
471 login_rsp = (struct iscsi_login_rsp *) login->rsp;
472 payload_length = ntoh24(login_req->dlength);
473
474 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
475 if (!param)
476 return -1;
477
478 ret = iscsi_decode_text_input(
479 PHASE_SECURITY|PHASE_DECLARATIVE,
480 SENDER_INITIATOR|SENDER_RECEIVER,
481 login->req_buf,
482 payload_length,
483 conn);
484 if (ret < 0)
485 return -1;
486
487 if (ret > 0) {
488 if (login->auth_complete) {
489 pr_err("Initiator has already been"
490 " successfully authenticated, but is still"
491 " sending %s keys.\n", param->value);
492 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
493 ISCSI_LOGIN_STATUS_INIT_ERR);
494 return -1;
495 }
496
497 goto do_auth;
498 }
499
500 if (login->first_request)
501 if (iscsi_target_check_first_request(conn, login) < 0)
502 return -1;
503
504 ret = iscsi_encode_text_output(
505 PHASE_SECURITY|PHASE_DECLARATIVE,
506 SENDER_TARGET,
507 login->rsp_buf,
508 &login->rsp_length,
509 conn->param_list);
510 if (ret < 0)
511 return -1;
512
513 if (!iscsi_check_negotiated_keys(conn->param_list)) {
514 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication &&
515 !strncmp(param->value, NONE, 4)) {
516 pr_err("Initiator sent AuthMethod=None but"
517 " Target is enforcing iSCSI Authentication,"
518 " login failed.\n");
519 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
520 ISCSI_LOGIN_STATUS_AUTH_FAILED);
521 return -1;
522 }
523
524 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication &&
525 !login->auth_complete)
526 return 0;
527
528 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
529 return 0;
530
531 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
532 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
533 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
534 ISCSI_FLAG_LOGIN_TRANSIT;
535 login->current_stage = 1;
536 }
537 }
538
539 return 0;
540 do_auth:
541 return iscsi_target_do_authentication(conn, login);
542 }
543
iscsi_target_handle_csg_one(struct iscsi_conn * conn,struct iscsi_login * login)544 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
545 {
546 int ret;
547 u32 payload_length;
548 struct iscsi_login_req *login_req;
549 struct iscsi_login_rsp *login_rsp;
550
551 login_req = (struct iscsi_login_req *) login->req;
552 login_rsp = (struct iscsi_login_rsp *) login->rsp;
553 payload_length = ntoh24(login_req->dlength);
554
555 ret = iscsi_decode_text_input(
556 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
557 SENDER_INITIATOR|SENDER_RECEIVER,
558 login->req_buf,
559 payload_length,
560 conn);
561 if (ret < 0) {
562 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
563 ISCSI_LOGIN_STATUS_INIT_ERR);
564 return -1;
565 }
566
567 if (login->first_request)
568 if (iscsi_target_check_first_request(conn, login) < 0)
569 return -1;
570
571 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
572 return -1;
573
574 ret = iscsi_encode_text_output(
575 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
576 SENDER_TARGET,
577 login->rsp_buf,
578 &login->rsp_length,
579 conn->param_list);
580 if (ret < 0) {
581 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
582 ISCSI_LOGIN_STATUS_INIT_ERR);
583 return -1;
584 }
585
586 if (!login->auth_complete &&
587 ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication) {
588 pr_err("Initiator is requesting CSG: 1, has not been"
589 " successfully authenticated, and the Target is"
590 " enforcing iSCSI Authentication, login failed.\n");
591 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
592 ISCSI_LOGIN_STATUS_AUTH_FAILED);
593 return -1;
594 }
595
596 if (!iscsi_check_negotiated_keys(conn->param_list))
597 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
598 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
599 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
600 ISCSI_FLAG_LOGIN_TRANSIT;
601
602 return 0;
603 }
604
iscsi_target_do_login(struct iscsi_conn * conn,struct iscsi_login * login)605 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
606 {
607 int pdu_count = 0;
608 struct iscsi_login_req *login_req;
609 struct iscsi_login_rsp *login_rsp;
610
611 login_req = (struct iscsi_login_req *) login->req;
612 login_rsp = (struct iscsi_login_rsp *) login->rsp;
613
614 while (1) {
615 if (++pdu_count > MAX_LOGIN_PDUS) {
616 pr_err("MAX_LOGIN_PDUS count reached.\n");
617 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
618 ISCSI_LOGIN_STATUS_TARGET_ERROR);
619 return -1;
620 }
621
622 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
623 case 0:
624 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
625 if (iscsi_target_handle_csg_zero(conn, login) < 0)
626 return -1;
627 break;
628 case 1:
629 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
630 if (iscsi_target_handle_csg_one(conn, login) < 0)
631 return -1;
632 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
633 login->tsih = conn->sess->tsih;
634 login->login_complete = 1;
635 if (iscsi_target_do_tx_login_io(conn,
636 login) < 0)
637 return -1;
638 return 0;
639 }
640 break;
641 default:
642 pr_err("Illegal CSG: %d received from"
643 " Initiator, protocol error.\n",
644 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
645 break;
646 }
647
648 if (iscsi_target_do_login_io(conn, login) < 0)
649 return -1;
650
651 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
652 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
653 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
654 }
655 }
656
657 return 0;
658 }
659
iscsi_initiatorname_tolower(char * param_buf)660 static void iscsi_initiatorname_tolower(
661 char *param_buf)
662 {
663 char *c;
664 u32 iqn_size = strlen(param_buf), i;
665
666 for (i = 0; i < iqn_size; i++) {
667 c = ¶m_buf[i];
668 if (!isupper(*c))
669 continue;
670
671 *c = tolower(*c);
672 }
673 }
674
675 /*
676 * Processes the first Login Request..
677 */
iscsi_target_locate_portal(struct iscsi_np * np,struct iscsi_conn * conn,struct iscsi_login * login)678 int iscsi_target_locate_portal(
679 struct iscsi_np *np,
680 struct iscsi_conn *conn,
681 struct iscsi_login *login)
682 {
683 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
684 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
685 struct iscsi_session *sess = conn->sess;
686 struct iscsi_tiqn *tiqn;
687 struct iscsi_login_req *login_req;
688 u32 payload_length;
689 int sessiontype = 0, ret = 0;
690
691 login_req = (struct iscsi_login_req *) login->req;
692 payload_length = ntoh24(login_req->dlength);
693
694 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
695 if (!tmpbuf) {
696 pr_err("Unable to allocate memory for tmpbuf.\n");
697 return -1;
698 }
699
700 memcpy(tmpbuf, login->req_buf, payload_length);
701 tmpbuf[payload_length] = '\0';
702 start = tmpbuf;
703 end = (start + payload_length);
704
705 /*
706 * Locate the initial keys expected from the Initiator node in
707 * the first login request in order to progress with the login phase.
708 */
709 while (start < end) {
710 if (iscsi_extract_key_value(start, &key, &value) < 0) {
711 ret = -1;
712 goto out;
713 }
714
715 if (!strncmp(key, "InitiatorName", 13))
716 i_buf = value;
717 else if (!strncmp(key, "SessionType", 11))
718 s_buf = value;
719 else if (!strncmp(key, "TargetName", 10))
720 t_buf = value;
721
722 start += strlen(key) + strlen(value) + 2;
723 }
724 /*
725 * See 5.3. Login Phase.
726 */
727 if (!i_buf) {
728 pr_err("InitiatorName key not received"
729 " in first login request.\n");
730 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
731 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
732 ret = -1;
733 goto out;
734 }
735 /*
736 * Convert the incoming InitiatorName to lowercase following
737 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
738 * are NOT case sensitive.
739 */
740 iscsi_initiatorname_tolower(i_buf);
741
742 if (!s_buf) {
743 if (!login->leading_connection)
744 goto get_target;
745
746 pr_err("SessionType key not received"
747 " in first login request.\n");
748 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
749 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
750 ret = -1;
751 goto out;
752 }
753
754 /*
755 * Use default portal group for discovery sessions.
756 */
757 sessiontype = strncmp(s_buf, DISCOVERY, 9);
758 if (!sessiontype) {
759 conn->tpg = iscsit_global->discovery_tpg;
760 if (!login->leading_connection)
761 goto get_target;
762
763 sess->sess_ops->SessionType = 1;
764 /*
765 * Setup crc32c modules from libcrypto
766 */
767 if (iscsi_login_setup_crypto(conn) < 0) {
768 pr_err("iscsi_login_setup_crypto() failed\n");
769 ret = -1;
770 goto out;
771 }
772 /*
773 * Serialize access across the discovery struct iscsi_portal_group to
774 * process login attempt.
775 */
776 if (iscsit_access_np(np, conn->tpg) < 0) {
777 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
778 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
779 ret = -1;
780 goto out;
781 }
782 ret = 0;
783 goto out;
784 }
785
786 get_target:
787 if (!t_buf) {
788 pr_err("TargetName key not received"
789 " in first login request while"
790 " SessionType=Normal.\n");
791 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
792 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
793 ret = -1;
794 goto out;
795 }
796
797 /*
798 * Locate Target IQN from Storage Node.
799 */
800 tiqn = iscsit_get_tiqn_for_login(t_buf);
801 if (!tiqn) {
802 pr_err("Unable to locate Target IQN: %s in"
803 " Storage Node\n", t_buf);
804 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
805 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
806 ret = -1;
807 goto out;
808 }
809 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
810
811 /*
812 * Locate Target Portal Group from Storage Node.
813 */
814 conn->tpg = iscsit_get_tpg_from_np(tiqn, np);
815 if (!conn->tpg) {
816 pr_err("Unable to locate Target Portal Group"
817 " on %s\n", tiqn->tiqn);
818 iscsit_put_tiqn_for_login(tiqn);
819 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
820 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
821 ret = -1;
822 goto out;
823 }
824 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
825 /*
826 * Setup crc32c modules from libcrypto
827 */
828 if (iscsi_login_setup_crypto(conn) < 0) {
829 pr_err("iscsi_login_setup_crypto() failed\n");
830 ret = -1;
831 goto out;
832 }
833 /*
834 * Serialize access across the struct iscsi_portal_group to
835 * process login attempt.
836 */
837 if (iscsit_access_np(np, conn->tpg) < 0) {
838 iscsit_put_tiqn_for_login(tiqn);
839 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
840 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
841 ret = -1;
842 conn->tpg = NULL;
843 goto out;
844 }
845
846 /*
847 * conn->sess->node_acl will be set when the referenced
848 * struct iscsi_session is located from received ISID+TSIH in
849 * iscsi_login_non_zero_tsih_s2().
850 */
851 if (!login->leading_connection) {
852 ret = 0;
853 goto out;
854 }
855
856 /*
857 * This value is required in iscsi_login_zero_tsih_s2()
858 */
859 sess->sess_ops->SessionType = 0;
860
861 /*
862 * Locate incoming Initiator IQN reference from Storage Node.
863 */
864 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
865 &conn->tpg->tpg_se_tpg, i_buf);
866 if (!sess->se_sess->se_node_acl) {
867 pr_err("iSCSI Initiator Node: %s is not authorized to"
868 " access iSCSI target portal group: %hu.\n",
869 i_buf, conn->tpg->tpgt);
870 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
871 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
872 ret = -1;
873 goto out;
874 }
875
876 ret = 0;
877 out:
878 kfree(tmpbuf);
879 return ret;
880 }
881
iscsi_target_start_negotiation(struct iscsi_login * login,struct iscsi_conn * conn)882 int iscsi_target_start_negotiation(
883 struct iscsi_login *login,
884 struct iscsi_conn *conn)
885 {
886 int ret;
887
888 ret = iscsi_target_do_login(conn, login);
889 if (ret != 0)
890 iscsi_remove_failed_auth_entry(conn);
891
892 iscsi_target_nego_release(conn);
893 return ret;
894 }
895
iscsi_target_nego_release(struct iscsi_conn * conn)896 void iscsi_target_nego_release(struct iscsi_conn *conn)
897 {
898 struct iscsi_login *login = conn->conn_login;
899
900 if (!login)
901 return;
902
903 kfree(login->req_buf);
904 kfree(login->rsp_buf);
905 kfree(login);
906
907 conn->conn_login = NULL;
908 }
909