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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
39void 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
48static 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
61int 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;
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
104static 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 iscsi_portal_group *iscsi_tpg;
116 struct se_node_acl *se_nacl;
117
118 if (!sess->sess_ops->SessionType) {
119
120
121
122 se_nacl = conn->sess->se_sess->se_node_acl;
123 if (!se_nacl) {
124 pr_err("Unable to locate struct se_node_acl for"
125 " CHAP auth\n");
126 return -1;
127 }
128 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
129 se_node_acl);
130 if (!iscsi_nacl) {
131 pr_err("Unable to locate struct iscsi_node_acl for"
132 " CHAP auth\n");
133 return -1;
134 }
135
136 if (se_nacl->dynamic_node_acl) {
137 iscsi_tpg = container_of(se_nacl->se_tpg,
138 struct iscsi_portal_group, tpg_se_tpg);
139
140 auth = &iscsi_tpg->tpg_demo_auth;
141 } else {
142 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
143 se_node_acl);
144
145 auth = ISCSI_NODE_AUTH(iscsi_nacl);
146 }
147 } else {
148
149
150
151 auth = &iscsit_global->discovery_acl.node_auth;
152 }
153
154 if (strstr("CHAP", authtype))
155 strcpy(conn->sess->auth_type, "CHAP");
156 else
157 strcpy(conn->sess->auth_type, NONE);
158
159 if (strstr("None", authtype))
160 return 1;
161#ifdef CANSRP
162 else if (strstr("SRP", authtype))
163 return srp_main_loop(conn, auth, in_buf, out_buf,
164 &in_length, out_length);
165#endif
166 else if (strstr("CHAP", authtype))
167 return chap_main_loop(conn, auth, in_buf, out_buf,
168 &in_length, out_length);
169 else if (strstr("SPKM1", authtype))
170 return 2;
171 else if (strstr("SPKM2", authtype))
172 return 2;
173 else if (strstr("KRB5", authtype))
174 return 2;
175 else
176 return 2;
177}
178
179static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
180{
181 kfree(conn->auth_protocol);
182}
183
184int iscsi_target_check_login_request(
185 struct iscsi_conn *conn,
186 struct iscsi_login *login)
187{
188 int req_csg, req_nsg;
189 u32 payload_length;
190 struct iscsi_login_req *login_req;
191
192 login_req = (struct iscsi_login_req *) login->req;
193 payload_length = ntoh24(login_req->dlength);
194
195 switch (login_req->opcode & ISCSI_OPCODE_MASK) {
196 case ISCSI_OP_LOGIN:
197 break;
198 default:
199 pr_err("Received unknown opcode 0x%02x.\n",
200 login_req->opcode & ISCSI_OPCODE_MASK);
201 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
202 ISCSI_LOGIN_STATUS_INIT_ERR);
203 return -1;
204 }
205
206 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
207 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
208 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
209 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
210 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
211 ISCSI_LOGIN_STATUS_INIT_ERR);
212 return -1;
213 }
214
215 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
216 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
217
218 if (req_csg != login->current_stage) {
219 pr_err("Initiator unexpectedly changed login stage"
220 " from %d to %d, login failed.\n", login->current_stage,
221 req_csg);
222 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
223 ISCSI_LOGIN_STATUS_INIT_ERR);
224 return -1;
225 }
226
227 if ((req_nsg == 2) || (req_csg >= 2) ||
228 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
229 (req_nsg <= req_csg))) {
230 pr_err("Illegal login_req->flags Combination, CSG: %d,"
231 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
232 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
233 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
234 ISCSI_LOGIN_STATUS_INIT_ERR);
235 return -1;
236 }
237
238 if ((login_req->max_version != login->version_max) ||
239 (login_req->min_version != login->version_min)) {
240 pr_err("Login request changed Version Max/Nin"
241 " unexpectedly to 0x%02x/0x%02x, protocol error\n",
242 login_req->max_version, login_req->min_version);
243 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
244 ISCSI_LOGIN_STATUS_INIT_ERR);
245 return -1;
246 }
247
248 if (memcmp(login_req->isid, login->isid, 6) != 0) {
249 pr_err("Login request changed ISID unexpectedly,"
250 " protocol error.\n");
251 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
252 ISCSI_LOGIN_STATUS_INIT_ERR);
253 return -1;
254 }
255
256 if (login_req->itt != login->init_task_tag) {
257 pr_err("Login request changed ITT unexpectedly to"
258 " 0x%08x, protocol error.\n", login_req->itt);
259 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
260 ISCSI_LOGIN_STATUS_INIT_ERR);
261 return -1;
262 }
263
264 if (payload_length > MAX_KEY_VALUE_PAIRS) {
265 pr_err("Login request payload exceeds default"
266 " MaxRecvDataSegmentLength: %u, protocol error.\n",
267 MAX_KEY_VALUE_PAIRS);
268 return -1;
269 }
270
271 return 0;
272}
273
274static int iscsi_target_check_first_request(
275 struct iscsi_conn *conn,
276 struct iscsi_login *login)
277{
278 struct iscsi_param *param = NULL;
279 struct se_node_acl *se_nacl;
280
281 login->first_request = 0;
282
283 list_for_each_entry(param, &conn->param_list->param_list, p_list) {
284 if (!strncmp(param->name, SESSIONTYPE, 11)) {
285 if (!IS_PSTATE_ACCEPTOR(param)) {
286 pr_err("SessionType key not received"
287 " in first login request.\n");
288 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
289 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
290 return -1;
291 }
292 if (!strncmp(param->value, DISCOVERY, 9))
293 return 0;
294 }
295
296 if (!strncmp(param->name, INITIATORNAME, 13)) {
297 if (!IS_PSTATE_ACCEPTOR(param)) {
298 if (!login->leading_connection)
299 continue;
300
301 pr_err("InitiatorName key not received"
302 " in first login request.\n");
303 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
304 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
305 return -1;
306 }
307
308
309
310
311
312
313 if (!login->leading_connection) {
314 se_nacl = conn->sess->se_sess->se_node_acl;
315 if (!se_nacl) {
316 pr_err("Unable to locate"
317 " struct se_node_acl\n");
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 if (strcmp(param->value,
325 se_nacl->initiatorname)) {
326 pr_err("Incorrect"
327 " InitiatorName: %s for this"
328 " iSCSI Initiator Node.\n",
329 param->value);
330 iscsit_tx_login_rsp(conn,
331 ISCSI_STATUS_CLS_INITIATOR_ERR,
332 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
333 return -1;
334 }
335 }
336 }
337 }
338
339 return 0;
340}
341
342static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
343{
344 u32 padding = 0;
345 struct iscsi_session *sess = conn->sess;
346 struct iscsi_login_rsp *login_rsp;
347
348 login_rsp = (struct iscsi_login_rsp *) login->rsp;
349
350 login_rsp->opcode = ISCSI_OP_LOGIN_RSP;
351 hton24(login_rsp->dlength, login->rsp_length);
352 memcpy(login_rsp->isid, login->isid, 6);
353 login_rsp->tsih = cpu_to_be16(login->tsih);
354 login_rsp->itt = login->init_task_tag;
355 login_rsp->statsn = cpu_to_be32(conn->stat_sn++);
356 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
357 login_rsp->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
358
359 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
360 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
361 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
362 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
363 ntohl(login_rsp->statsn), login->rsp_length);
364
365 padding = ((-login->rsp_length) & 3);
366
367 if (conn->conn_transport->iscsit_put_login_tx(conn, login,
368 login->rsp_length + padding) < 0)
369 return -1;
370
371 login->rsp_length = 0;
372 mutex_lock(&sess->cmdsn_mutex);
373 login_rsp->exp_cmdsn = cpu_to_be32(sess->exp_cmd_sn);
374 login_rsp->max_cmdsn = cpu_to_be32(sess->max_cmd_sn);
375 mutex_unlock(&sess->cmdsn_mutex);
376
377 return 0;
378}
379
380static int iscsi_target_do_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
381{
382 if (iscsi_target_do_tx_login_io(conn, login) < 0)
383 return -1;
384
385 if (conn->conn_transport->iscsit_get_login_rx(conn, login) < 0)
386 return -1;
387
388 return 0;
389}
390
391
392
393
394
395
396static int iscsi_target_check_for_existing_instances(
397 struct iscsi_conn *conn,
398 struct iscsi_login *login)
399{
400 if (login->checked_for_existing)
401 return 0;
402
403 login->checked_for_existing = 1;
404
405 if (!login->tsih)
406 return iscsi_check_for_session_reinstatement(conn);
407 else
408 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
409 login->initial_exp_statsn);
410}
411
412static int iscsi_target_do_authentication(
413 struct iscsi_conn *conn,
414 struct iscsi_login *login)
415{
416 int authret;
417 u32 payload_length;
418 struct iscsi_param *param;
419 struct iscsi_login_req *login_req;
420 struct iscsi_login_rsp *login_rsp;
421
422 login_req = (struct iscsi_login_req *) login->req;
423 login_rsp = (struct iscsi_login_rsp *) login->rsp;
424 payload_length = ntoh24(login_req->dlength);
425
426 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
427 if (!param)
428 return -1;
429
430 authret = iscsi_handle_authentication(
431 conn,
432 login->req_buf,
433 login->rsp_buf,
434 payload_length,
435 &login->rsp_length,
436 param->value);
437 switch (authret) {
438 case 0:
439 pr_debug("Received OK response"
440 " from LIO Authentication, continuing.\n");
441 break;
442 case 1:
443 pr_debug("iSCSI security negotiation"
444 " completed successfully.\n");
445 login->auth_complete = 1;
446 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
447 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
448 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
449 ISCSI_FLAG_LOGIN_TRANSIT);
450 login->current_stage = 1;
451 }
452 return iscsi_target_check_for_existing_instances(
453 conn, login);
454 case 2:
455 pr_err("Security negotiation"
456 " failed.\n");
457 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
458 ISCSI_LOGIN_STATUS_AUTH_FAILED);
459 return -1;
460 default:
461 pr_err("Received unknown error %d from LIO"
462 " Authentication\n", authret);
463 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
464 ISCSI_LOGIN_STATUS_TARGET_ERROR);
465 return -1;
466 }
467
468 return 0;
469}
470
471static int iscsi_target_handle_csg_zero(
472 struct iscsi_conn *conn,
473 struct iscsi_login *login)
474{
475 int ret;
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 ret = iscsi_decode_text_input(
490 PHASE_SECURITY|PHASE_DECLARATIVE,
491 SENDER_INITIATOR|SENDER_RECEIVER,
492 login->req_buf,
493 payload_length,
494 conn);
495 if (ret < 0)
496 return -1;
497
498 if (ret > 0) {
499 if (login->auth_complete) {
500 pr_err("Initiator has already been"
501 " successfully authenticated, but is still"
502 " sending %s keys.\n", param->value);
503 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
504 ISCSI_LOGIN_STATUS_INIT_ERR);
505 return -1;
506 }
507
508 goto do_auth;
509 }
510
511 if (login->first_request)
512 if (iscsi_target_check_first_request(conn, login) < 0)
513 return -1;
514
515 ret = iscsi_encode_text_output(
516 PHASE_SECURITY|PHASE_DECLARATIVE,
517 SENDER_TARGET,
518 login->rsp_buf,
519 &login->rsp_length,
520 conn->param_list);
521 if (ret < 0)
522 return -1;
523
524 if (!iscsi_check_negotiated_keys(conn->param_list)) {
525 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication &&
526 !strncmp(param->value, NONE, 4)) {
527 pr_err("Initiator sent AuthMethod=None but"
528 " Target is enforcing iSCSI Authentication,"
529 " login failed.\n");
530 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
531 ISCSI_LOGIN_STATUS_AUTH_FAILED);
532 return -1;
533 }
534
535 if (ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication &&
536 !login->auth_complete)
537 return 0;
538
539 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
540 return 0;
541
542 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
543 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
544 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
545 ISCSI_FLAG_LOGIN_TRANSIT;
546 login->current_stage = 1;
547 }
548 }
549
550 return 0;
551do_auth:
552 return iscsi_target_do_authentication(conn, login);
553}
554
555static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
556{
557 int ret;
558 u32 payload_length;
559 struct iscsi_login_req *login_req;
560 struct iscsi_login_rsp *login_rsp;
561
562 login_req = (struct iscsi_login_req *) login->req;
563 login_rsp = (struct iscsi_login_rsp *) login->rsp;
564 payload_length = ntoh24(login_req->dlength);
565
566 ret = iscsi_decode_text_input(
567 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
568 SENDER_INITIATOR|SENDER_RECEIVER,
569 login->req_buf,
570 payload_length,
571 conn);
572 if (ret < 0) {
573 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
574 ISCSI_LOGIN_STATUS_INIT_ERR);
575 return -1;
576 }
577
578 if (login->first_request)
579 if (iscsi_target_check_first_request(conn, login) < 0)
580 return -1;
581
582 if (iscsi_target_check_for_existing_instances(conn, login) < 0)
583 return -1;
584
585 ret = iscsi_encode_text_output(
586 PHASE_OPERATIONAL|PHASE_DECLARATIVE,
587 SENDER_TARGET,
588 login->rsp_buf,
589 &login->rsp_length,
590 conn->param_list);
591 if (ret < 0) {
592 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
593 ISCSI_LOGIN_STATUS_INIT_ERR);
594 return -1;
595 }
596
597 if (!login->auth_complete &&
598 ISCSI_TPG_ATTRIB(ISCSI_TPG_C(conn))->authentication) {
599 pr_err("Initiator is requesting CSG: 1, has not been"
600 " successfully authenticated, and the Target is"
601 " enforcing iSCSI Authentication, login failed.\n");
602 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
603 ISCSI_LOGIN_STATUS_AUTH_FAILED);
604 return -1;
605 }
606
607 if (!iscsi_check_negotiated_keys(conn->param_list))
608 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
609 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
610 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
611 ISCSI_FLAG_LOGIN_TRANSIT;
612
613 return 0;
614}
615
616static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
617{
618 int pdu_count = 0;
619 struct iscsi_login_req *login_req;
620 struct iscsi_login_rsp *login_rsp;
621
622 login_req = (struct iscsi_login_req *) login->req;
623 login_rsp = (struct iscsi_login_rsp *) login->rsp;
624
625 while (1) {
626 if (++pdu_count > MAX_LOGIN_PDUS) {
627 pr_err("MAX_LOGIN_PDUS count reached.\n");
628 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
629 ISCSI_LOGIN_STATUS_TARGET_ERROR);
630 return -1;
631 }
632
633 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
634 case 0:
635 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
636 if (iscsi_target_handle_csg_zero(conn, login) < 0)
637 return -1;
638 break;
639 case 1:
640 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
641 if (iscsi_target_handle_csg_one(conn, login) < 0)
642 return -1;
643 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
644 login->tsih = conn->sess->tsih;
645 login->login_complete = 1;
646 if (iscsi_target_do_tx_login_io(conn,
647 login) < 0)
648 return -1;
649 return 0;
650 }
651 break;
652 default:
653 pr_err("Illegal CSG: %d received from"
654 " Initiator, protocol error.\n",
655 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
656 break;
657 }
658
659 if (iscsi_target_do_login_io(conn, login) < 0)
660 return -1;
661
662 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
663 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
664 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
665 }
666 }
667
668 return 0;
669}
670
671static void iscsi_initiatorname_tolower(
672 char *param_buf)
673{
674 char *c;
675 u32 iqn_size = strlen(param_buf), i;
676
677 for (i = 0; i < iqn_size; i++) {
678 c = ¶m_buf[i];
679 if (!isupper(*c))
680 continue;
681
682 *c = tolower(*c);
683 }
684}
685
686
687
688
689int iscsi_target_locate_portal(
690 struct iscsi_np *np,
691 struct iscsi_conn *conn,
692 struct iscsi_login *login)
693{
694 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
695 char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
696 struct iscsi_session *sess = conn->sess;
697 struct iscsi_tiqn *tiqn;
698 struct iscsi_login_req *login_req;
699 u32 payload_length;
700 int sessiontype = 0, ret = 0;
701
702 login_req = (struct iscsi_login_req *) login->req;
703 payload_length = ntoh24(login_req->dlength);
704
705 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
706 if (!tmpbuf) {
707 pr_err("Unable to allocate memory for tmpbuf.\n");
708 return -1;
709 }
710
711 memcpy(tmpbuf, login->req_buf, payload_length);
712 tmpbuf[payload_length] = '\0';
713 start = tmpbuf;
714 end = (start + payload_length);
715
716
717
718
719
720 while (start < end) {
721 if (iscsi_extract_key_value(start, &key, &value) < 0) {
722 ret = -1;
723 goto out;
724 }
725
726 if (!strncmp(key, "InitiatorName", 13))
727 i_buf = value;
728 else if (!strncmp(key, "SessionType", 11))
729 s_buf = value;
730 else if (!strncmp(key, "TargetName", 10))
731 t_buf = value;
732
733 start += strlen(key) + strlen(value) + 2;
734 }
735
736
737
738 if (!i_buf) {
739 pr_err("InitiatorName key not received"
740 " in first login request.\n");
741 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
742 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
743 ret = -1;
744 goto out;
745 }
746
747
748
749
750
751 iscsi_initiatorname_tolower(i_buf);
752
753 if (!s_buf) {
754 if (!login->leading_connection)
755 goto get_target;
756
757 pr_err("SessionType key not received"
758 " in first login request.\n");
759 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
760 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
761 ret = -1;
762 goto out;
763 }
764
765
766
767
768 sessiontype = strncmp(s_buf, DISCOVERY, 9);
769 if (!sessiontype) {
770 conn->tpg = iscsit_global->discovery_tpg;
771 if (!login->leading_connection)
772 goto get_target;
773
774 sess->sess_ops->SessionType = 1;
775
776
777
778 if (iscsi_login_setup_crypto(conn) < 0) {
779 pr_err("iscsi_login_setup_crypto() failed\n");
780 ret = -1;
781 goto out;
782 }
783
784
785
786
787 if (iscsit_access_np(np, conn->tpg) < 0) {
788 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
789 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
790 ret = -1;
791 goto out;
792 }
793 ret = 0;
794 goto out;
795 }
796
797get_target:
798 if (!t_buf) {
799 pr_err("TargetName key not received"
800 " in first login request while"
801 " SessionType=Normal.\n");
802 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
803 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
804 ret = -1;
805 goto out;
806 }
807
808
809
810
811 tiqn = iscsit_get_tiqn_for_login(t_buf);
812 if (!tiqn) {
813 pr_err("Unable to locate Target IQN: %s in"
814 " Storage Node\n", t_buf);
815 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
816 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
817 ret = -1;
818 goto out;
819 }
820 pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
821
822
823
824
825 conn->tpg = iscsit_get_tpg_from_np(tiqn, np);
826 if (!conn->tpg) {
827 pr_err("Unable to locate Target Portal Group"
828 " on %s\n", tiqn->tiqn);
829 iscsit_put_tiqn_for_login(tiqn);
830 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
831 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
832 ret = -1;
833 goto out;
834 }
835 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
836
837
838
839 if (iscsi_login_setup_crypto(conn) < 0) {
840 pr_err("iscsi_login_setup_crypto() failed\n");
841 ret = -1;
842 goto out;
843 }
844
845
846
847
848 if (iscsit_access_np(np, conn->tpg) < 0) {
849 iscsit_put_tiqn_for_login(tiqn);
850 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
851 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
852 ret = -1;
853 conn->tpg = NULL;
854 goto out;
855 }
856
857
858
859
860
861
862 if (!login->leading_connection) {
863 ret = 0;
864 goto out;
865 }
866
867
868
869
870 sess->sess_ops->SessionType = 0;
871
872
873
874
875 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
876 &conn->tpg->tpg_se_tpg, i_buf);
877 if (!sess->se_sess->se_node_acl) {
878 pr_err("iSCSI Initiator Node: %s is not authorized to"
879 " access iSCSI target portal group: %hu.\n",
880 i_buf, conn->tpg->tpgt);
881 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
882 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
883 ret = -1;
884 goto out;
885 }
886
887 ret = 0;
888out:
889 kfree(tmpbuf);
890 return ret;
891}
892
893int iscsi_target_start_negotiation(
894 struct iscsi_login *login,
895 struct iscsi_conn *conn)
896{
897 int ret;
898
899 ret = iscsi_target_do_login(conn, login);
900 if (ret != 0)
901 iscsi_remove_failed_auth_entry(conn);
902
903 iscsi_target_nego_release(conn);
904 return ret;
905}
906
907void iscsi_target_nego_release(struct iscsi_conn *conn)
908{
909 struct iscsi_login *login = conn->conn_login;
910
911 if (!login)
912 return;
913
914 kfree(login->req_buf);
915 kfree(login->rsp_buf);
916 kfree(login);
917
918 conn->conn_login = NULL;
919}
920
