2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2012 The FreeBSD Foundation
7 * This software was developed by Edward Tomasz Napierala under sponsorship
8 * from the FreeBSD Foundation.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/types.h>
37 #include <sys/ioctl.h>
43 #include <netinet/in.h>
46 #include "iscsi_proto.h"
49 login_nsg(const struct pdu *response)
51 struct iscsi_bhs_login_response *bhslr;
53 bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
55 return (bhslr->bhslr_flags & 0x03);
59 login_set_nsg(struct pdu *request, int nsg)
61 struct iscsi_bhs_login_request *bhslr;
63 assert(nsg == BHSLR_STAGE_SECURITY_NEGOTIATION ||
64 nsg == BHSLR_STAGE_OPERATIONAL_NEGOTIATION ||
65 nsg == BHSLR_STAGE_FULL_FEATURE_PHASE);
67 bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs;
69 bhslr->bhslr_flags &= 0xFC;
70 bhslr->bhslr_flags |= nsg;
74 login_set_csg(struct pdu *request, int csg)
76 struct iscsi_bhs_login_request *bhslr;
78 assert(csg == BHSLR_STAGE_SECURITY_NEGOTIATION ||
79 csg == BHSLR_STAGE_OPERATIONAL_NEGOTIATION ||
80 csg == BHSLR_STAGE_FULL_FEATURE_PHASE);
82 bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs;
84 bhslr->bhslr_flags &= 0xF3;
85 bhslr->bhslr_flags |= csg << 2;
89 login_target_error_str(int class, int detail)
94 * RFC 3270, 10.13.5. Status-Class and Status-Detail
100 return ("Target moved temporarily");
102 return ("Target moved permanently");
104 snprintf(msg, sizeof(msg), "unknown redirection; "
105 "Status-Class 0x%x, Status-Detail 0x%x",
112 return ("Initiator error");
114 return ("Authentication failure");
116 return ("Authorization failure");
118 return ("Not found");
120 return ("Target removed");
122 return ("Unsupported version");
124 return ("Too many connections");
126 return ("Missing parameter");
128 return ("Can't include in session");
130 return ("Session type not supported");
132 return ("Session does not exist");
134 return ("Invalid during login");
136 snprintf(msg, sizeof(msg), "unknown initiator error; "
137 "Status-Class 0x%x, Status-Detail 0x%x",
144 return ("Target error");
146 return ("Service unavailable");
148 return ("Out of resources");
150 snprintf(msg, sizeof(msg), "unknown target error; "
151 "Status-Class 0x%x, Status-Detail 0x%x",
156 snprintf(msg, sizeof(msg), "unknown error; "
157 "Status-Class 0x%x, Status-Detail 0x%x",
164 kernel_modify(const struct connection *conn, const char *target_address)
166 struct iscsi_session_modify ism;
169 memset(&ism, 0, sizeof(ism));
170 ism.ism_session_id = conn->conn_session_id;
171 memcpy(&ism.ism_conf, &conn->conn_conf, sizeof(ism.ism_conf));
172 strlcpy(ism.ism_conf.isc_target_addr, target_address,
173 sizeof(ism.ism_conf.isc_target));
174 error = ioctl(conn->conn_iscsi_fd, ISCSISMODIFY, &ism);
176 log_err(1, "failed to redirect to %s: ISCSISMODIFY",
182 * XXX: The way it works is suboptimal; what should happen is described
183 * in draft-gilligan-iscsi-fault-tolerance-00. That, however, would
184 * be much more complicated: we would need to keep "dependencies"
185 * for sessions, so that, in case described in draft and using draft
186 * terminology, we would have three sessions: one for discovery,
187 * one for initial target portal, and one for redirect portal.
188 * This would allow us to "backtrack" on connection failure,
189 * as described in draft.
192 login_handle_redirection(struct connection *conn, struct pdu *response)
194 struct iscsi_bhs_login_response *bhslr;
195 struct keys *response_keys;
196 const char *target_address;
198 bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
199 assert (bhslr->bhslr_status_class == 1);
201 response_keys = keys_new();
202 keys_load(response_keys, response);
204 target_address = keys_find(response_keys, "TargetAddress");
205 if (target_address == NULL)
206 log_errx(1, "received redirection without TargetAddress");
207 if (target_address[0] == '\0')
208 log_errx(1, "received redirection with empty TargetAddress");
209 if (strlen(target_address) >=
210 sizeof(conn->conn_conf.isc_target_addr) - 1)
211 log_errx(1, "received TargetAddress is too long");
213 log_debugx("received redirection to \"%s\"", target_address);
214 kernel_modify(conn, target_address);
215 keys_delete(response_keys);
219 login_receive(struct connection *conn)
221 struct pdu *response;
222 struct iscsi_bhs_login_response *bhslr;
223 const char *errorstr;
224 static bool initial = true;
226 response = pdu_new(conn);
227 pdu_receive(response);
228 if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_LOGIN_RESPONSE) {
229 log_errx(1, "protocol error: received invalid opcode 0x%x",
230 response->pdu_bhs->bhs_opcode);
232 bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
234 * XXX: Implement the C flag some day.
236 if ((bhslr->bhslr_flags & BHSLR_FLAGS_CONTINUE) != 0)
237 log_errx(1, "received Login PDU with unsupported \"C\" flag");
238 if (bhslr->bhslr_version_max != 0x00)
239 log_errx(1, "received Login PDU with unsupported "
240 "Version-max 0x%x", bhslr->bhslr_version_max);
241 if (bhslr->bhslr_version_active != 0x00)
242 log_errx(1, "received Login PDU with unsupported "
243 "Version-active 0x%x", bhslr->bhslr_version_active);
244 if (bhslr->bhslr_status_class == 1) {
245 login_handle_redirection(conn, response);
246 log_debugx("redirection handled; exiting");
249 if (bhslr->bhslr_status_class != 0) {
250 errorstr = login_target_error_str(bhslr->bhslr_status_class,
251 bhslr->bhslr_status_detail);
252 fail(conn, errorstr);
253 log_errx(1, "target returned error: %s", errorstr);
255 if (initial == false &&
256 ntohl(bhslr->bhslr_statsn) != conn->conn_statsn + 1) {
258 * It's a warning, not an error, to work around what seems
259 * to be bug in NetBSD iSCSI target.
261 log_warnx("received Login PDU with wrong StatSN: "
262 "is %u, should be %u", ntohl(bhslr->bhslr_statsn),
263 conn->conn_statsn + 1);
265 conn->conn_tsih = ntohs(bhslr->bhslr_tsih);
266 conn->conn_statsn = ntohl(bhslr->bhslr_statsn);
274 login_new_request(struct connection *conn, int csg)
277 struct iscsi_bhs_login_request *bhslr;
280 request = pdu_new(conn);
281 bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs;
282 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGIN_REQUEST |
283 ISCSI_BHS_OPCODE_IMMEDIATE;
285 bhslr->bhslr_flags = BHSLR_FLAGS_TRANSIT;
287 case BHSLR_STAGE_SECURITY_NEGOTIATION:
288 nsg = BHSLR_STAGE_OPERATIONAL_NEGOTIATION;
290 case BHSLR_STAGE_OPERATIONAL_NEGOTIATION:
291 nsg = BHSLR_STAGE_FULL_FEATURE_PHASE;
294 assert(!"invalid csg");
295 log_errx(1, "invalid csg %d", csg);
297 login_set_csg(request, csg);
298 login_set_nsg(request, nsg);
300 memcpy(bhslr->bhslr_isid, &conn->conn_isid, sizeof(bhslr->bhslr_isid));
301 bhslr->bhslr_tsih = htons(conn->conn_tsih);
302 bhslr->bhslr_initiator_task_tag = 0;
303 bhslr->bhslr_cmdsn = 0;
304 bhslr->bhslr_expstatsn = htonl(conn->conn_statsn + 1);
310 login_list_prefers(const char *list,
311 const char *choice1, const char *choice2)
313 char *tofree, *str, *token;
315 tofree = str = checked_strdup(list);
317 while ((token = strsep(&str, ",")) != NULL) {
318 if (strcmp(token, choice1) == 0) {
322 if (strcmp(token, choice2) == 0) {
332 login_negotiate_key(struct connection *conn, const char *name,
335 struct iscsi_session_limits *isl;
338 isl = &conn->conn_limits;
339 if (strcmp(name, "TargetAlias") == 0) {
340 strlcpy(conn->conn_target_alias, value,
341 sizeof(conn->conn_target_alias));
342 } else if (strcmp(value, "Irrelevant") == 0) {
344 } else if (strcmp(name, "HeaderDigest") == 0) {
345 which = login_list_prefers(value, "CRC32C", "None");
348 log_debugx("target prefers CRC32C "
349 "for header digest; we'll use it");
350 conn->conn_header_digest = CONN_DIGEST_CRC32C;
353 log_debugx("target prefers not to do "
354 "header digest; we'll comply");
357 log_warnx("target sent unrecognized "
358 "HeaderDigest value \"%s\"; will use None", value);
361 } else if (strcmp(name, "DataDigest") == 0) {
362 which = login_list_prefers(value, "CRC32C", "None");
365 log_debugx("target prefers CRC32C "
366 "for data digest; we'll use it");
367 conn->conn_data_digest = CONN_DIGEST_CRC32C;
370 log_debugx("target prefers not to do "
371 "data digest; we'll comply");
374 log_warnx("target sent unrecognized "
375 "DataDigest value \"%s\"; will use None", value);
378 } else if (strcmp(name, "MaxConnections") == 0) {
380 } else if (strcmp(name, "InitialR2T") == 0) {
381 if (strcmp(value, "Yes") == 0)
382 conn->conn_initial_r2t = true;
384 conn->conn_initial_r2t = false;
385 } else if (strcmp(name, "ImmediateData") == 0) {
386 if (strcmp(value, "Yes") == 0)
387 conn->conn_immediate_data = true;
389 conn->conn_immediate_data = false;
390 } else if (strcmp(name, "MaxRecvDataSegmentLength") == 0) {
391 tmp = strtoul(value, NULL, 10);
393 log_errx(1, "received invalid "
394 "MaxRecvDataSegmentLength");
395 if (tmp > isl->isl_max_send_data_segment_length) {
396 log_debugx("capping max_send_data_segment_length "
397 "from %d to %d", tmp,
398 isl->isl_max_send_data_segment_length);
399 tmp = isl->isl_max_send_data_segment_length;
401 conn->conn_max_send_data_segment_length = tmp;
402 /* We received target's limit, that means it accepted our's. */
403 conn->conn_max_recv_data_segment_length =
404 isl->isl_max_recv_data_segment_length;
405 } else if (strcmp(name, "MaxBurstLength") == 0) {
406 tmp = strtoul(value, NULL, 10);
408 log_errx(1, "received invalid MaxBurstLength");
409 if (tmp > isl->isl_max_burst_length) {
410 log_debugx("capping MaxBurstLength "
411 "from %d to %d", tmp, isl->isl_max_burst_length);
412 tmp = isl->isl_max_burst_length;
414 conn->conn_max_burst_length = tmp;
415 } else if (strcmp(name, "FirstBurstLength") == 0) {
416 tmp = strtoul(value, NULL, 10);
418 log_errx(1, "received invalid FirstBurstLength");
419 if (tmp > isl->isl_first_burst_length) {
420 log_debugx("capping FirstBurstLength "
421 "from %d to %d", tmp, isl->isl_first_burst_length);
422 tmp = isl->isl_first_burst_length;
424 conn->conn_first_burst_length = tmp;
425 } else if (strcmp(name, "DefaultTime2Wait") == 0) {
427 } else if (strcmp(name, "DefaultTime2Retain") == 0) {
429 } else if (strcmp(name, "MaxOutstandingR2T") == 0) {
431 } else if (strcmp(name, "DataPDUInOrder") == 0) {
433 } else if (strcmp(name, "DataSequenceInOrder") == 0) {
435 } else if (strcmp(name, "ErrorRecoveryLevel") == 0) {
437 } else if (strcmp(name, "OFMarker") == 0) {
439 } else if (strcmp(name, "IFMarker") == 0) {
441 } else if (strcmp(name, "RDMAExtensions") == 0) {
442 if (conn->conn_conf.isc_iser == 1 &&
443 strcmp(value, "Yes") != 0) {
444 log_errx(1, "received unsupported RDMAExtensions");
446 } else if (strcmp(name, "InitiatorRecvDataSegmentLength") == 0) {
447 tmp = strtoul(value, NULL, 10);
449 log_errx(1, "received invalid "
450 "InitiatorRecvDataSegmentLength");
451 if ((int)tmp > isl->isl_max_recv_data_segment_length) {
452 log_debugx("capping InitiatorRecvDataSegmentLength "
453 "from %d to %d", tmp,
454 isl->isl_max_recv_data_segment_length);
455 tmp = isl->isl_max_recv_data_segment_length;
457 conn->conn_max_recv_data_segment_length = tmp;
458 } else if (strcmp(name, "TargetPortalGroupTag") == 0) {
460 } else if (strcmp(name, "TargetRecvDataSegmentLength") == 0) {
461 tmp = strtoul(value, NULL, 10);
464 "received invalid TargetRecvDataSegmentLength");
466 if (tmp > isl->isl_max_send_data_segment_length) {
467 log_debugx("capping TargetRecvDataSegmentLength "
468 "from %d to %d", tmp,
469 isl->isl_max_send_data_segment_length);
470 tmp = isl->isl_max_send_data_segment_length;
472 conn->conn_max_send_data_segment_length = tmp;
474 log_debugx("unknown key \"%s\"; ignoring", name);
479 login_negotiate(struct connection *conn)
481 struct pdu *request, *response;
482 struct keys *request_keys, *response_keys;
483 struct iscsi_bhs_login_response *bhslr;
484 int i, nrequests = 0;
485 struct iscsi_session_limits *isl;
487 log_debugx("beginning operational parameter negotiation");
488 request = login_new_request(conn, BHSLR_STAGE_OPERATIONAL_NEGOTIATION);
489 request_keys = keys_new();
491 isl = &conn->conn_limits;
492 log_debugx("Limits for offload \"%s\" are "
493 "MaxRecvDataSegment=%d, max_send_dsl=%d, "
494 "MaxBurstLength=%d, FirstBurstLength=%d",
495 conn->conn_conf.isc_offload, isl->isl_max_recv_data_segment_length,
496 isl->isl_max_send_data_segment_length, isl->isl_max_burst_length,
497 isl->isl_first_burst_length);
500 * The following keys are irrelevant for discovery sessions.
502 if (conn->conn_conf.isc_discovery == 0) {
503 if (conn->conn_conf.isc_header_digest != 0)
504 keys_add(request_keys, "HeaderDigest", "CRC32C");
506 keys_add(request_keys, "HeaderDigest", "None");
507 if (conn->conn_conf.isc_data_digest != 0)
508 keys_add(request_keys, "DataDigest", "CRC32C");
510 keys_add(request_keys, "DataDigest", "None");
512 keys_add(request_keys, "ImmediateData", "Yes");
513 keys_add_int(request_keys, "MaxBurstLength",
514 isl->isl_max_burst_length);
515 keys_add_int(request_keys, "FirstBurstLength",
516 isl->isl_first_burst_length);
517 keys_add(request_keys, "InitialR2T", "Yes");
518 keys_add(request_keys, "MaxOutstandingR2T", "1");
519 if (conn->conn_conf.isc_iser == 1) {
520 keys_add_int(request_keys, "InitiatorRecvDataSegmentLength",
521 isl->isl_max_recv_data_segment_length);
522 keys_add_int(request_keys, "TargetRecvDataSegmentLength",
523 isl->isl_max_send_data_segment_length);
524 keys_add(request_keys, "RDMAExtensions", "Yes");
526 keys_add_int(request_keys, "MaxRecvDataSegmentLength",
527 isl->isl_max_recv_data_segment_length);
530 keys_add(request_keys, "HeaderDigest", "None");
531 keys_add(request_keys, "DataDigest", "None");
532 keys_add_int(request_keys, "MaxRecvDataSegmentLength",
533 isl->isl_max_recv_data_segment_length);
536 keys_add(request_keys, "DefaultTime2Wait", "0");
537 keys_add(request_keys, "DefaultTime2Retain", "0");
538 keys_add(request_keys, "ErrorRecoveryLevel", "0");
539 keys_save(request_keys, request);
540 keys_delete(request_keys);
546 response = login_receive(conn);
547 response_keys = keys_new();
548 keys_load(response_keys, response);
549 for (i = 0; i < KEYS_MAX; i++) {
550 if (response_keys->keys_names[i] == NULL)
553 login_negotiate_key(conn,
554 response_keys->keys_names[i], response_keys->keys_values[i]);
557 keys_delete(response_keys);
558 response_keys = NULL;
561 bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
562 if ((bhslr->bhslr_flags & BHSLR_FLAGS_TRANSIT) != 0)
567 log_warnx("received login response "
568 "without the \"T\" flag too many times; giving up");
572 log_debugx("received login response "
573 "without the \"T\" flag; sending another request");
575 pdu_delete(response);
577 request = login_new_request(conn,
578 BHSLR_STAGE_OPERATIONAL_NEGOTIATION);
582 response = login_receive(conn);
585 if (login_nsg(response) != BHSLR_STAGE_FULL_FEATURE_PHASE)
586 log_warnx("received final login response with wrong NSG 0x%x",
587 login_nsg(response));
588 pdu_delete(response);
590 log_debugx("operational parameter negotiation done; "
591 "transitioning to Full Feature phase");
595 login_send_chap_a(struct connection *conn)
598 struct keys *request_keys;
600 request = login_new_request(conn, BHSLR_STAGE_SECURITY_NEGOTIATION);
601 request_keys = keys_new();
602 keys_add(request_keys, "CHAP_A", "5");
603 keys_save(request_keys, request);
604 keys_delete(request_keys);
610 login_send_chap_r(struct pdu *response)
612 struct connection *conn;
614 struct keys *request_keys, *response_keys;
616 const char *chap_a, *chap_c, *chap_i;
619 char *mutual_chap_c, *mutual_chap_i;
622 * As in the rest of the initiator, 'request' means
623 * 'initiator -> target', and 'response' means 'target -> initiator',
625 * So, here the 'response' from the target is the packet that contains
626 * CHAP challenge; our CHAP response goes into 'request'.
629 conn = response->pdu_connection;
631 response_keys = keys_new();
632 keys_load(response_keys, response);
635 * First, compute the response.
637 chap_a = keys_find(response_keys, "CHAP_A");
639 log_errx(1, "received CHAP packet without CHAP_A");
640 chap_c = keys_find(response_keys, "CHAP_C");
642 log_errx(1, "received CHAP packet without CHAP_C");
643 chap_i = keys_find(response_keys, "CHAP_I");
645 log_errx(1, "received CHAP packet without CHAP_I");
647 if (strcmp(chap_a, "5") != 0) {
648 log_errx(1, "received CHAP packet "
649 "with unsupported CHAP_A \"%s\"", chap_a);
652 rchap = rchap_new(conn->conn_conf.isc_secret);
653 error = rchap_receive(rchap, chap_i, chap_c);
655 log_errx(1, "received CHAP packet "
656 "with malformed CHAP_I or CHAP_C");
658 chap_r = rchap_get_response(rchap);
661 keys_delete(response_keys);
663 request = login_new_request(conn, BHSLR_STAGE_SECURITY_NEGOTIATION);
664 request_keys = keys_new();
665 keys_add(request_keys, "CHAP_N", conn->conn_conf.isc_user);
666 keys_add(request_keys, "CHAP_R", chap_r);
670 * If we want mutual authentication, we're expected to send
671 * our CHAP_I/CHAP_C now.
673 if (conn->conn_conf.isc_mutual_user[0] != '\0') {
674 log_debugx("requesting mutual authentication; "
675 "binary challenge size is %zd bytes",
676 sizeof(conn->conn_mutual_chap->chap_challenge));
678 assert(conn->conn_mutual_chap == NULL);
679 conn->conn_mutual_chap = chap_new();
680 mutual_chap_i = chap_get_id(conn->conn_mutual_chap);
681 mutual_chap_c = chap_get_challenge(conn->conn_mutual_chap);
682 keys_add(request_keys, "CHAP_I", mutual_chap_i);
683 keys_add(request_keys, "CHAP_C", mutual_chap_c);
688 keys_save(request_keys, request);
689 keys_delete(request_keys);
695 login_verify_mutual(const struct pdu *response)
697 struct connection *conn;
698 struct keys *response_keys;
699 const char *chap_n, *chap_r;
702 conn = response->pdu_connection;
704 response_keys = keys_new();
705 keys_load(response_keys, response);
707 chap_n = keys_find(response_keys, "CHAP_N");
709 log_errx(1, "received CHAP Response PDU without CHAP_N");
710 chap_r = keys_find(response_keys, "CHAP_R");
712 log_errx(1, "received CHAP Response PDU without CHAP_R");
714 error = chap_receive(conn->conn_mutual_chap, chap_r);
716 log_errx(1, "received CHAP Response PDU with invalid CHAP_R");
718 if (strcmp(chap_n, conn->conn_conf.isc_mutual_user) != 0) {
719 fail(conn, "Mutual CHAP failed");
720 log_errx(1, "mutual CHAP authentication failed: wrong user");
723 error = chap_authenticate(conn->conn_mutual_chap,
724 conn->conn_conf.isc_mutual_secret);
726 fail(conn, "Mutual CHAP failed");
727 log_errx(1, "mutual CHAP authentication failed: wrong secret");
730 keys_delete(response_keys);
731 chap_delete(conn->conn_mutual_chap);
732 conn->conn_mutual_chap = NULL;
734 log_debugx("mutual CHAP authentication succeeded");
738 login_chap(struct connection *conn)
740 struct pdu *response;
742 log_debugx("beginning CHAP authentication; sending CHAP_A");
743 login_send_chap_a(conn);
745 log_debugx("waiting for CHAP_A/CHAP_C/CHAP_I");
746 response = login_receive(conn);
748 log_debugx("sending CHAP_N/CHAP_R");
749 login_send_chap_r(response);
750 pdu_delete(response);
753 * XXX: Make sure this is not susceptible to MITM.
756 log_debugx("waiting for CHAP result");
757 response = login_receive(conn);
758 if (conn->conn_conf.isc_mutual_user[0] != '\0')
759 login_verify_mutual(response);
760 pdu_delete(response);
762 log_debugx("CHAP authentication done");
766 login(struct connection *conn)
768 struct pdu *request, *response;
769 struct keys *request_keys, *response_keys;
770 struct iscsi_bhs_login_response *bhslr2;
771 const char *auth_method;
774 log_debugx("beginning Login phase; sending Login PDU");
775 request = login_new_request(conn, BHSLR_STAGE_SECURITY_NEGOTIATION);
776 request_keys = keys_new();
777 if (conn->conn_conf.isc_mutual_user[0] != '\0') {
778 keys_add(request_keys, "AuthMethod", "CHAP");
779 } else if (conn->conn_conf.isc_user[0] != '\0') {
781 * Give target a chance to skip authentication if it
782 * doesn't feel like it.
784 * None is first, CHAP second; this is to work around
785 * what seems to be LIO (Linux target) bug: otherwise,
786 * if target is configured with no authentication,
787 * and we are configured to authenticate, the target
788 * will erroneously respond with AuthMethod=CHAP
789 * instead of AuthMethod=None, and will subsequently
790 * fail the connection. This usually happens with
791 * Discovery sessions, which default to no authentication.
793 keys_add(request_keys, "AuthMethod", "None,CHAP");
795 keys_add(request_keys, "AuthMethod", "None");
797 keys_add(request_keys, "InitiatorName",
798 conn->conn_conf.isc_initiator);
799 if (conn->conn_conf.isc_initiator_alias[0] != '\0') {
800 keys_add(request_keys, "InitiatorAlias",
801 conn->conn_conf.isc_initiator_alias);
803 if (conn->conn_conf.isc_discovery == 0) {
804 keys_add(request_keys, "SessionType", "Normal");
805 keys_add(request_keys,
806 "TargetName", conn->conn_conf.isc_target);
808 keys_add(request_keys, "SessionType", "Discovery");
810 keys_save(request_keys, request);
811 keys_delete(request_keys);
815 response = login_receive(conn);
817 response_keys = keys_new();
818 keys_load(response_keys, response);
820 for (i = 0; i < KEYS_MAX; i++) {
821 if (response_keys->keys_names[i] == NULL)
825 * Not interested in AuthMethod at this point; we only need
826 * to parse things such as TargetAlias.
828 * XXX: This is somewhat ugly. We should have a way to apply
829 * all the keys to the session and use that by default
830 * instead of discarding them.
832 if (strcmp(response_keys->keys_names[i], "AuthMethod") == 0)
835 login_negotiate_key(conn,
836 response_keys->keys_names[i], response_keys->keys_values[i]);
839 bhslr2 = (struct iscsi_bhs_login_response *)response->pdu_bhs;
840 if ((bhslr2->bhslr_flags & BHSLR_FLAGS_TRANSIT) != 0 &&
841 login_nsg(response) == BHSLR_STAGE_OPERATIONAL_NEGOTIATION) {
842 if (conn->conn_conf.isc_mutual_user[0] != '\0') {
843 log_errx(1, "target requested transition "
844 "to operational parameter negotiation, "
845 "but we require mutual CHAP");
848 log_debugx("target requested transition "
849 "to operational parameter negotiation");
850 keys_delete(response_keys);
851 pdu_delete(response);
852 login_negotiate(conn);
856 auth_method = keys_find(response_keys, "AuthMethod");
857 if (auth_method == NULL)
858 log_errx(1, "received response without AuthMethod");
859 if (strcmp(auth_method, "None") == 0) {
860 if (conn->conn_conf.isc_mutual_user[0] != '\0') {
861 log_errx(1, "target does not require authantication, "
862 "but we require mutual CHAP");
865 log_debugx("target does not require authentication");
866 keys_delete(response_keys);
867 pdu_delete(response);
868 login_negotiate(conn);
872 if (strcmp(auth_method, "CHAP") != 0) {
873 fail(conn, "Unsupported AuthMethod");
874 log_errx(1, "received response "
875 "with unsupported AuthMethod \"%s\"", auth_method);
878 if (conn->conn_conf.isc_user[0] == '\0' ||
879 conn->conn_conf.isc_secret[0] == '\0') {
880 fail(conn, "Authentication required");
881 log_errx(1, "target requests CHAP authentication, but we don't "
882 "have user and secret");
885 keys_delete(response_keys);
886 response_keys = NULL;
887 pdu_delete(response);
891 login_negotiate(conn);