2 * Copyright (c) 2012 The FreeBSD Foundation
5 * This software was developed by Edward Tomasz Napierala under sponsorship
6 * from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/types.h>
35 #include <sys/ioctl.h>
41 #include <netinet/in.h>
44 #include "iscsi_proto.h"
47 login_nsg(const struct pdu *response)
49 struct iscsi_bhs_login_response *bhslr;
51 bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
53 return (bhslr->bhslr_flags & 0x03);
57 login_set_nsg(struct pdu *request, int nsg)
59 struct iscsi_bhs_login_request *bhslr;
61 assert(nsg == BHSLR_STAGE_SECURITY_NEGOTIATION ||
62 nsg == BHSLR_STAGE_OPERATIONAL_NEGOTIATION ||
63 nsg == BHSLR_STAGE_FULL_FEATURE_PHASE);
65 bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs;
67 bhslr->bhslr_flags &= 0xFC;
68 bhslr->bhslr_flags |= nsg;
72 login_set_csg(struct pdu *request, int csg)
74 struct iscsi_bhs_login_request *bhslr;
76 assert(csg == BHSLR_STAGE_SECURITY_NEGOTIATION ||
77 csg == BHSLR_STAGE_OPERATIONAL_NEGOTIATION ||
78 csg == BHSLR_STAGE_FULL_FEATURE_PHASE);
80 bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs;
82 bhslr->bhslr_flags &= 0xF3;
83 bhslr->bhslr_flags |= csg << 2;
87 login_target_error_str(int class, int detail)
92 * RFC 3270, 10.13.5. Status-Class and Status-Detail
98 return ("Target moved temporarily");
100 return ("Target moved permanently");
102 snprintf(msg, sizeof(msg), "unknown redirection; "
103 "Status-Class 0x%x, Status-Detail 0x%x",
110 return ("Initiator error");
112 return ("Authentication failure");
114 return ("Authorization failure");
116 return ("Not found");
118 return ("Target removed");
120 return ("Unsupported version");
122 return ("Too many connections");
124 return ("Missing parameter");
126 return ("Can't include in session");
128 return ("Session type not supported");
130 return ("Session does not exist");
132 return ("Invalid during login");
134 snprintf(msg, sizeof(msg), "unknown initiator error; "
135 "Status-Class 0x%x, Status-Detail 0x%x",
142 return ("Target error");
144 return ("Service unavailable");
146 return ("Out of resources");
148 snprintf(msg, sizeof(msg), "unknown target error; "
149 "Status-Class 0x%x, Status-Detail 0x%x",
154 snprintf(msg, sizeof(msg), "unknown error; "
155 "Status-Class 0x%x, Status-Detail 0x%x",
162 kernel_modify(const struct connection *conn, const char *target_address)
164 struct iscsi_session_modify ism;
167 memset(&ism, 0, sizeof(ism));
168 ism.ism_session_id = conn->conn_session_id;
169 memcpy(&ism.ism_conf, &conn->conn_conf, sizeof(ism.ism_conf));
170 strlcpy(ism.ism_conf.isc_target_addr, target_address,
171 sizeof(ism.ism_conf.isc_target));
172 error = ioctl(conn->conn_iscsi_fd, ISCSISMODIFY, &ism);
174 log_err(1, "failed to redirect to %s: ISCSISMODIFY",
180 * XXX: The way it works is suboptimal; what should happen is described
181 * in draft-gilligan-iscsi-fault-tolerance-00. That, however, would
182 * be much more complicated: we would need to keep "dependencies"
183 * for sessions, so that, in case described in draft and using draft
184 * terminology, we would have three sessions: one for discovery,
185 * one for initial target portal, and one for redirect portal.
186 * This would allow us to "backtrack" on connection failure,
187 * as described in draft.
190 login_handle_redirection(struct connection *conn, struct pdu *response)
192 struct iscsi_bhs_login_response *bhslr;
193 struct keys *response_keys;
194 const char *target_address;
196 bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
197 assert (bhslr->bhslr_status_class == 1);
199 response_keys = keys_new();
200 keys_load(response_keys, response);
202 target_address = keys_find(response_keys, "TargetAddress");
203 if (target_address == NULL)
204 log_errx(1, "received redirection without TargetAddress");
205 if (target_address[0] == '\0')
206 log_errx(1, "received redirection with empty TargetAddress");
207 if (strlen(target_address) >=
208 sizeof(conn->conn_conf.isc_target_addr) - 1)
209 log_errx(1, "received TargetAddress is too long");
211 log_debugx("received redirection to \"%s\"", target_address);
212 kernel_modify(conn, target_address);
213 keys_delete(response_keys);
217 login_receive(struct connection *conn)
219 struct pdu *response;
220 struct iscsi_bhs_login_response *bhslr;
221 const char *errorstr;
222 static bool initial = true;
224 response = pdu_new(conn);
225 pdu_receive(response);
226 if (response->pdu_bhs->bhs_opcode != ISCSI_BHS_OPCODE_LOGIN_RESPONSE) {
227 log_errx(1, "protocol error: received invalid opcode 0x%x",
228 response->pdu_bhs->bhs_opcode);
230 bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
232 * XXX: Implement the C flag some day.
234 if ((bhslr->bhslr_flags & BHSLR_FLAGS_CONTINUE) != 0)
235 log_errx(1, "received Login PDU with unsupported \"C\" flag");
236 if (bhslr->bhslr_version_max != 0x00)
237 log_errx(1, "received Login PDU with unsupported "
238 "Version-max 0x%x", bhslr->bhslr_version_max);
239 if (bhslr->bhslr_version_active != 0x00)
240 log_errx(1, "received Login PDU with unsupported "
241 "Version-active 0x%x", bhslr->bhslr_version_active);
242 if (bhslr->bhslr_status_class == 1) {
243 login_handle_redirection(conn, response);
244 log_debugx("redirection handled; exiting");
247 if (bhslr->bhslr_status_class != 0) {
248 errorstr = login_target_error_str(bhslr->bhslr_status_class,
249 bhslr->bhslr_status_detail);
250 fail(conn, errorstr);
251 log_errx(1, "target returned error: %s", errorstr);
253 if (initial == false &&
254 ntohl(bhslr->bhslr_statsn) != conn->conn_statsn + 1) {
256 * It's a warning, not an error, to work around what seems
257 * to be bug in NetBSD iSCSI target.
259 log_warnx("received Login PDU with wrong StatSN: "
260 "is %u, should be %u", ntohl(bhslr->bhslr_statsn),
261 conn->conn_statsn + 1);
263 conn->conn_tsih = ntohs(bhslr->bhslr_tsih);
264 conn->conn_statsn = ntohl(bhslr->bhslr_statsn);
272 login_new_request(struct connection *conn, int csg)
275 struct iscsi_bhs_login_request *bhslr;
278 request = pdu_new(conn);
279 bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs;
280 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGIN_REQUEST |
281 ISCSI_BHS_OPCODE_IMMEDIATE;
283 bhslr->bhslr_flags = BHSLR_FLAGS_TRANSIT;
285 case BHSLR_STAGE_SECURITY_NEGOTIATION:
286 nsg = BHSLR_STAGE_OPERATIONAL_NEGOTIATION;
288 case BHSLR_STAGE_OPERATIONAL_NEGOTIATION:
289 nsg = BHSLR_STAGE_FULL_FEATURE_PHASE;
292 assert(!"invalid csg");
293 log_errx(1, "invalid csg %d", csg);
295 login_set_csg(request, csg);
296 login_set_nsg(request, nsg);
298 memcpy(bhslr->bhslr_isid, &conn->conn_isid, sizeof(bhslr->bhslr_isid));
299 bhslr->bhslr_tsih = htons(conn->conn_tsih);
300 bhslr->bhslr_initiator_task_tag = 0;
301 bhslr->bhslr_cmdsn = 0;
302 bhslr->bhslr_expstatsn = htonl(conn->conn_statsn + 1);
308 login_list_prefers(const char *list,
309 const char *choice1, const char *choice2)
311 char *tofree, *str, *token;
313 tofree = str = checked_strdup(list);
315 while ((token = strsep(&str, ",")) != NULL) {
316 if (strcmp(token, choice1) == 0) {
320 if (strcmp(token, choice2) == 0) {
330 login_negotiate_key(struct connection *conn, const char *name,
333 struct iscsi_session_limits *isl;
336 isl = &conn->conn_limits;
337 if (strcmp(name, "TargetAlias") == 0) {
338 strlcpy(conn->conn_target_alias, value,
339 sizeof(conn->conn_target_alias));
340 } else if (strcmp(value, "Irrelevant") == 0) {
342 } else if (strcmp(name, "HeaderDigest") == 0) {
343 which = login_list_prefers(value, "CRC32C", "None");
346 log_debugx("target prefers CRC32C "
347 "for header digest; we'll use it");
348 conn->conn_header_digest = CONN_DIGEST_CRC32C;
351 log_debugx("target prefers not to do "
352 "header digest; we'll comply");
355 log_warnx("target sent unrecognized "
356 "HeaderDigest value \"%s\"; will use None", value);
359 } else if (strcmp(name, "DataDigest") == 0) {
360 which = login_list_prefers(value, "CRC32C", "None");
363 log_debugx("target prefers CRC32C "
364 "for data digest; we'll use it");
365 conn->conn_data_digest = CONN_DIGEST_CRC32C;
368 log_debugx("target prefers not to do "
369 "data digest; we'll comply");
372 log_warnx("target sent unrecognized "
373 "DataDigest value \"%s\"; will use None", value);
376 } else if (strcmp(name, "MaxConnections") == 0) {
378 } else if (strcmp(name, "InitialR2T") == 0) {
379 if (strcmp(value, "Yes") == 0)
380 conn->conn_initial_r2t = true;
382 conn->conn_initial_r2t = false;
383 } else if (strcmp(name, "ImmediateData") == 0) {
384 if (strcmp(value, "Yes") == 0)
385 conn->conn_immediate_data = true;
387 conn->conn_immediate_data = false;
388 } else if (strcmp(name, "MaxRecvDataSegmentLength") == 0) {
389 tmp = strtoul(value, NULL, 10);
391 log_errx(1, "received invalid "
392 "MaxRecvDataSegmentLength");
393 if (tmp > isl->isl_max_send_data_segment_length) {
394 log_debugx("capping max_send_data_segment_length "
395 "from %d to %d", tmp,
396 isl->isl_max_send_data_segment_length);
397 tmp = isl->isl_max_send_data_segment_length;
399 conn->conn_max_send_data_segment_length = tmp;
400 /* We received target's limit, that means it accepted our's. */
401 conn->conn_max_recv_data_segment_length =
402 isl->isl_max_recv_data_segment_length;
403 } else if (strcmp(name, "MaxBurstLength") == 0) {
404 tmp = strtoul(value, NULL, 10);
406 log_errx(1, "received invalid MaxBurstLength");
407 if (tmp > isl->isl_max_burst_length) {
408 log_debugx("capping MaxBurstLength "
409 "from %d to %d", tmp, isl->isl_max_burst_length);
410 tmp = isl->isl_max_burst_length;
412 conn->conn_max_burst_length = tmp;
413 } else if (strcmp(name, "FirstBurstLength") == 0) {
414 tmp = strtoul(value, NULL, 10);
416 log_errx(1, "received invalid FirstBurstLength");
417 if (tmp > isl->isl_first_burst_length) {
418 log_debugx("capping FirstBurstLength "
419 "from %d to %d", tmp, isl->isl_first_burst_length);
420 tmp = isl->isl_first_burst_length;
422 conn->conn_first_burst_length = tmp;
423 } else if (strcmp(name, "DefaultTime2Wait") == 0) {
425 } else if (strcmp(name, "DefaultTime2Retain") == 0) {
427 } else if (strcmp(name, "MaxOutstandingR2T") == 0) {
429 } else if (strcmp(name, "DataPDUInOrder") == 0) {
431 } else if (strcmp(name, "DataSequenceInOrder") == 0) {
433 } else if (strcmp(name, "ErrorRecoveryLevel") == 0) {
435 } else if (strcmp(name, "OFMarker") == 0) {
437 } else if (strcmp(name, "IFMarker") == 0) {
439 } else if (strcmp(name, "RDMAExtensions") == 0) {
440 if (conn->conn_conf.isc_iser == 1 &&
441 strcmp(value, "Yes") != 0) {
442 log_errx(1, "received unsupported RDMAExtensions");
444 } else if (strcmp(name, "InitiatorRecvDataSegmentLength") == 0) {
445 tmp = strtoul(value, NULL, 10);
447 log_errx(1, "received invalid "
448 "InitiatorRecvDataSegmentLength");
449 if ((int)tmp > isl->isl_max_recv_data_segment_length) {
450 log_debugx("capping InitiatorRecvDataSegmentLength "
451 "from %d to %d", tmp,
452 isl->isl_max_recv_data_segment_length);
453 tmp = isl->isl_max_recv_data_segment_length;
455 conn->conn_max_recv_data_segment_length = tmp;
456 } else if (strcmp(name, "TargetPortalGroupTag") == 0) {
458 } else if (strcmp(name, "TargetRecvDataSegmentLength") == 0) {
459 tmp = strtoul(value, NULL, 10);
462 "received invalid TargetRecvDataSegmentLength");
464 if (tmp > isl->isl_max_send_data_segment_length) {
465 log_debugx("capping TargetRecvDataSegmentLength "
466 "from %d to %d", tmp,
467 isl->isl_max_send_data_segment_length);
468 tmp = isl->isl_max_send_data_segment_length;
470 conn->conn_max_send_data_segment_length = tmp;
472 log_debugx("unknown key \"%s\"; ignoring", name);
477 login_negotiate(struct connection *conn)
479 struct pdu *request, *response;
480 struct keys *request_keys, *response_keys;
481 struct iscsi_bhs_login_response *bhslr;
482 int i, nrequests = 0;
483 struct iscsi_session_limits *isl;
485 log_debugx("beginning operational parameter negotiation");
486 request = login_new_request(conn, BHSLR_STAGE_OPERATIONAL_NEGOTIATION);
487 request_keys = keys_new();
489 isl = &conn->conn_limits;
490 log_debugx("Limits for offload \"%s\" are "
491 "MaxRecvDataSegment=%d, max_send_dsl=%d, "
492 "MaxBurstLength=%d, FirstBurstLength=%d",
493 conn->conn_conf.isc_offload, isl->isl_max_recv_data_segment_length,
494 isl->isl_max_send_data_segment_length, isl->isl_max_burst_length,
495 isl->isl_first_burst_length);
498 * The following keys are irrelevant for discovery sessions.
500 if (conn->conn_conf.isc_discovery == 0) {
501 if (conn->conn_conf.isc_header_digest != 0)
502 keys_add(request_keys, "HeaderDigest", "CRC32C");
504 keys_add(request_keys, "HeaderDigest", "None");
505 if (conn->conn_conf.isc_data_digest != 0)
506 keys_add(request_keys, "DataDigest", "CRC32C");
508 keys_add(request_keys, "DataDigest", "None");
510 keys_add(request_keys, "ImmediateData", "Yes");
511 keys_add_int(request_keys, "MaxBurstLength",
512 isl->isl_max_burst_length);
513 keys_add_int(request_keys, "FirstBurstLength",
514 isl->isl_first_burst_length);
515 keys_add(request_keys, "InitialR2T", "Yes");
516 keys_add(request_keys, "MaxOutstandingR2T", "1");
517 if (conn->conn_conf.isc_iser == 1) {
518 keys_add_int(request_keys, "InitiatorRecvDataSegmentLength",
519 isl->isl_max_recv_data_segment_length);
520 keys_add_int(request_keys, "TargetRecvDataSegmentLength",
521 isl->isl_max_send_data_segment_length);
522 keys_add(request_keys, "RDMAExtensions", "Yes");
524 keys_add_int(request_keys, "MaxRecvDataSegmentLength",
525 isl->isl_max_recv_data_segment_length);
528 keys_add(request_keys, "HeaderDigest", "None");
529 keys_add(request_keys, "DataDigest", "None");
530 keys_add_int(request_keys, "MaxRecvDataSegmentLength",
531 isl->isl_max_recv_data_segment_length);
534 keys_add(request_keys, "DefaultTime2Wait", "0");
535 keys_add(request_keys, "DefaultTime2Retain", "0");
536 keys_add(request_keys, "ErrorRecoveryLevel", "0");
537 keys_save(request_keys, request);
538 keys_delete(request_keys);
544 response = login_receive(conn);
545 response_keys = keys_new();
546 keys_load(response_keys, response);
547 for (i = 0; i < KEYS_MAX; i++) {
548 if (response_keys->keys_names[i] == NULL)
551 login_negotiate_key(conn,
552 response_keys->keys_names[i], response_keys->keys_values[i]);
555 keys_delete(response_keys);
556 response_keys = NULL;
559 bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs;
560 if ((bhslr->bhslr_flags & BHSLR_FLAGS_TRANSIT) != 0)
565 log_warnx("received login response "
566 "without the \"T\" flag too many times; giving up");
570 log_debugx("received login response "
571 "without the \"T\" flag; sending another request");
573 pdu_delete(response);
575 request = login_new_request(conn,
576 BHSLR_STAGE_OPERATIONAL_NEGOTIATION);
580 response = login_receive(conn);
583 if (login_nsg(response) != BHSLR_STAGE_FULL_FEATURE_PHASE)
584 log_warnx("received final login response with wrong NSG 0x%x",
585 login_nsg(response));
586 pdu_delete(response);
588 log_debugx("operational parameter negotiation done; "
589 "transitioning to Full Feature phase");
593 login_send_chap_a(struct connection *conn)
596 struct keys *request_keys;
598 request = login_new_request(conn, BHSLR_STAGE_SECURITY_NEGOTIATION);
599 request_keys = keys_new();
600 keys_add(request_keys, "CHAP_A", "5");
601 keys_save(request_keys, request);
602 keys_delete(request_keys);
608 login_send_chap_r(struct pdu *response)
610 struct connection *conn;
612 struct keys *request_keys, *response_keys;
614 const char *chap_a, *chap_c, *chap_i;
617 char *mutual_chap_c, *mutual_chap_i;
620 * As in the rest of the initiator, 'request' means
621 * 'initiator -> target', and 'response' means 'target -> initiator',
623 * So, here the 'response' from the target is the packet that contains
624 * CHAP challenge; our CHAP response goes into 'request'.
627 conn = response->pdu_connection;
629 response_keys = keys_new();
630 keys_load(response_keys, response);
633 * First, compute the response.
635 chap_a = keys_find(response_keys, "CHAP_A");
637 log_errx(1, "received CHAP packet without CHAP_A");
638 chap_c = keys_find(response_keys, "CHAP_C");
640 log_errx(1, "received CHAP packet without CHAP_C");
641 chap_i = keys_find(response_keys, "CHAP_I");
643 log_errx(1, "received CHAP packet without CHAP_I");
645 if (strcmp(chap_a, "5") != 0) {
646 log_errx(1, "received CHAP packet "
647 "with unsupported CHAP_A \"%s\"", chap_a);
650 rchap = rchap_new(conn->conn_conf.isc_secret);
651 error = rchap_receive(rchap, chap_i, chap_c);
653 log_errx(1, "received CHAP packet "
654 "with malformed CHAP_I or CHAP_C");
656 chap_r = rchap_get_response(rchap);
659 keys_delete(response_keys);
661 request = login_new_request(conn, BHSLR_STAGE_SECURITY_NEGOTIATION);
662 request_keys = keys_new();
663 keys_add(request_keys, "CHAP_N", conn->conn_conf.isc_user);
664 keys_add(request_keys, "CHAP_R", chap_r);
668 * If we want mutual authentication, we're expected to send
669 * our CHAP_I/CHAP_C now.
671 if (conn->conn_conf.isc_mutual_user[0] != '\0') {
672 log_debugx("requesting mutual authentication; "
673 "binary challenge size is %zd bytes",
674 sizeof(conn->conn_mutual_chap->chap_challenge));
676 assert(conn->conn_mutual_chap == NULL);
677 conn->conn_mutual_chap = chap_new();
678 mutual_chap_i = chap_get_id(conn->conn_mutual_chap);
679 mutual_chap_c = chap_get_challenge(conn->conn_mutual_chap);
680 keys_add(request_keys, "CHAP_I", mutual_chap_i);
681 keys_add(request_keys, "CHAP_C", mutual_chap_c);
686 keys_save(request_keys, request);
687 keys_delete(request_keys);
693 login_verify_mutual(const struct pdu *response)
695 struct connection *conn;
696 struct keys *response_keys;
697 const char *chap_n, *chap_r;
700 conn = response->pdu_connection;
702 response_keys = keys_new();
703 keys_load(response_keys, response);
705 chap_n = keys_find(response_keys, "CHAP_N");
707 log_errx(1, "received CHAP Response PDU without CHAP_N");
708 chap_r = keys_find(response_keys, "CHAP_R");
710 log_errx(1, "received CHAP Response PDU without CHAP_R");
712 error = chap_receive(conn->conn_mutual_chap, chap_r);
714 log_errx(1, "received CHAP Response PDU with invalid CHAP_R");
716 if (strcmp(chap_n, conn->conn_conf.isc_mutual_user) != 0) {
717 fail(conn, "Mutual CHAP failed");
718 log_errx(1, "mutual CHAP authentication failed: wrong user");
721 error = chap_authenticate(conn->conn_mutual_chap,
722 conn->conn_conf.isc_mutual_secret);
724 fail(conn, "Mutual CHAP failed");
725 log_errx(1, "mutual CHAP authentication failed: wrong secret");
728 keys_delete(response_keys);
729 chap_delete(conn->conn_mutual_chap);
730 conn->conn_mutual_chap = NULL;
732 log_debugx("mutual CHAP authentication succeeded");
736 login_chap(struct connection *conn)
738 struct pdu *response;
740 log_debugx("beginning CHAP authentication; sending CHAP_A");
741 login_send_chap_a(conn);
743 log_debugx("waiting for CHAP_A/CHAP_C/CHAP_I");
744 response = login_receive(conn);
746 log_debugx("sending CHAP_N/CHAP_R");
747 login_send_chap_r(response);
748 pdu_delete(response);
751 * XXX: Make sure this is not susceptible to MITM.
754 log_debugx("waiting for CHAP result");
755 response = login_receive(conn);
756 if (conn->conn_conf.isc_mutual_user[0] != '\0')
757 login_verify_mutual(response);
758 pdu_delete(response);
760 log_debugx("CHAP authentication done");
764 login(struct connection *conn)
766 struct pdu *request, *response;
767 struct keys *request_keys, *response_keys;
768 struct iscsi_bhs_login_response *bhslr2;
769 const char *auth_method;
772 log_debugx("beginning Login phase; sending Login PDU");
773 request = login_new_request(conn, BHSLR_STAGE_SECURITY_NEGOTIATION);
774 request_keys = keys_new();
775 if (conn->conn_conf.isc_mutual_user[0] != '\0') {
776 keys_add(request_keys, "AuthMethod", "CHAP");
777 } else if (conn->conn_conf.isc_user[0] != '\0') {
779 * Give target a chance to skip authentication if it
780 * doesn't feel like it.
782 * None is first, CHAP second; this is to work around
783 * what seems to be LIO (Linux target) bug: otherwise,
784 * if target is configured with no authentication,
785 * and we are configured to authenticate, the target
786 * will erroneously respond with AuthMethod=CHAP
787 * instead of AuthMethod=None, and will subsequently
788 * fail the connection. This usually happens with
789 * Discovery sessions, which default to no authentication.
791 keys_add(request_keys, "AuthMethod", "None,CHAP");
793 keys_add(request_keys, "AuthMethod", "None");
795 keys_add(request_keys, "InitiatorName",
796 conn->conn_conf.isc_initiator);
797 if (conn->conn_conf.isc_initiator_alias[0] != '\0') {
798 keys_add(request_keys, "InitiatorAlias",
799 conn->conn_conf.isc_initiator_alias);
801 if (conn->conn_conf.isc_discovery == 0) {
802 keys_add(request_keys, "SessionType", "Normal");
803 keys_add(request_keys,
804 "TargetName", conn->conn_conf.isc_target);
806 keys_add(request_keys, "SessionType", "Discovery");
808 keys_save(request_keys, request);
809 keys_delete(request_keys);
813 response = login_receive(conn);
815 response_keys = keys_new();
816 keys_load(response_keys, response);
818 for (i = 0; i < KEYS_MAX; i++) {
819 if (response_keys->keys_names[i] == NULL)
823 * Not interested in AuthMethod at this point; we only need
824 * to parse things such as TargetAlias.
826 * XXX: This is somewhat ugly. We should have a way to apply
827 * all the keys to the session and use that by default
828 * instead of discarding them.
830 if (strcmp(response_keys->keys_names[i], "AuthMethod") == 0)
833 login_negotiate_key(conn,
834 response_keys->keys_names[i], response_keys->keys_values[i]);
837 bhslr2 = (struct iscsi_bhs_login_response *)response->pdu_bhs;
838 if ((bhslr2->bhslr_flags & BHSLR_FLAGS_TRANSIT) != 0 &&
839 login_nsg(response) == BHSLR_STAGE_OPERATIONAL_NEGOTIATION) {
840 if (conn->conn_conf.isc_mutual_user[0] != '\0') {
841 log_errx(1, "target requested transition "
842 "to operational parameter negotiation, "
843 "but we require mutual CHAP");
846 log_debugx("target requested transition "
847 "to operational parameter negotiation");
848 keys_delete(response_keys);
849 pdu_delete(response);
850 login_negotiate(conn);
854 auth_method = keys_find(response_keys, "AuthMethod");
855 if (auth_method == NULL)
856 log_errx(1, "received response without AuthMethod");
857 if (strcmp(auth_method, "None") == 0) {
858 if (conn->conn_conf.isc_mutual_user[0] != '\0') {
859 log_errx(1, "target does not require authantication, "
860 "but we require mutual CHAP");
863 log_debugx("target does not require authentication");
864 keys_delete(response_keys);
865 pdu_delete(response);
866 login_negotiate(conn);
870 if (strcmp(auth_method, "CHAP") != 0) {
871 fail(conn, "Unsupported AuthMethod");
872 log_errx(1, "received response "
873 "with unsupported AuthMethod \"%s\"", auth_method);
876 if (conn->conn_conf.isc_user[0] == '\0' ||
877 conn->conn_conf.isc_secret[0] == '\0') {
878 fail(conn, "Authentication required");
879 log_errx(1, "target requests CHAP authentication, but we don't "
880 "have user and secret");
883 keys_delete(response_keys);
884 response_keys = NULL;
885 pdu_delete(response);
889 login_negotiate(conn);