login.c revision 288753
1/*- 2 * Copyright (c) 2012 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Edward Tomasz Napierala under sponsorship 6 * from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 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. 16 * 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 27 * SUCH DAMAGE. 28 * 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: stable/10/usr.sbin/ctld/login.c 288753 2015-10-05 09:16:01Z mav $"); 33 34#include <assert.h> 35#include <stdbool.h> 36#include <stdlib.h> 37#include <string.h> 38#include <unistd.h> 39#include <netinet/in.h> 40 41#include "ctld.h" 42#include "iscsi_proto.h" 43 44static void login_send_error(struct pdu *request, 45 char class, char detail); 46 47static void 48login_set_nsg(struct pdu *response, int nsg) 49{ 50 struct iscsi_bhs_login_response *bhslr; 51 52 assert(nsg == BHSLR_STAGE_SECURITY_NEGOTIATION || 53 nsg == BHSLR_STAGE_OPERATIONAL_NEGOTIATION || 54 nsg == BHSLR_STAGE_FULL_FEATURE_PHASE); 55 56 bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs; 57 58 bhslr->bhslr_flags &= 0xFC; 59 bhslr->bhslr_flags |= nsg; 60 bhslr->bhslr_flags |= BHSLR_FLAGS_TRANSIT; 61} 62 63static int 64login_csg(const struct pdu *request) 65{ 66 struct iscsi_bhs_login_request *bhslr; 67 68 bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs; 69 70 return ((bhslr->bhslr_flags & 0x0C) >> 2); 71} 72 73static void 74login_set_csg(struct pdu *response, int csg) 75{ 76 struct iscsi_bhs_login_response *bhslr; 77 78 assert(csg == BHSLR_STAGE_SECURITY_NEGOTIATION || 79 csg == BHSLR_STAGE_OPERATIONAL_NEGOTIATION || 80 csg == BHSLR_STAGE_FULL_FEATURE_PHASE); 81 82 bhslr = (struct iscsi_bhs_login_response *)response->pdu_bhs; 83 84 bhslr->bhslr_flags &= 0xF3; 85 bhslr->bhslr_flags |= csg << 2; 86} 87 88static struct pdu * 89login_receive(struct connection *conn, bool initial) 90{ 91 struct pdu *request; 92 struct iscsi_bhs_login_request *bhslr; 93 94 request = pdu_new(conn); 95 pdu_receive(request); 96 if ((request->pdu_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) != 97 ISCSI_BHS_OPCODE_LOGIN_REQUEST) { 98 /* 99 * The first PDU in session is special - if we receive any PDU 100 * different than login request, we have to drop the connection 101 * without sending response ("A target receiving any PDU 102 * except a Login request before the Login Phase is started MUST 103 * immediately terminate the connection on which the PDU 104 * was received.") 105 */ 106 if (initial == false) 107 login_send_error(request, 0x02, 0x0b); 108 log_errx(1, "protocol error: received invalid opcode 0x%x", 109 request->pdu_bhs->bhs_opcode); 110 } 111 bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs; 112 /* 113 * XXX: Implement the C flag some day. 114 */ 115 if ((bhslr->bhslr_flags & BHSLR_FLAGS_CONTINUE) != 0) { 116 login_send_error(request, 0x03, 0x00); 117 log_errx(1, "received Login PDU with unsupported \"C\" flag"); 118 } 119 if (bhslr->bhslr_version_max != 0x00) { 120 login_send_error(request, 0x02, 0x05); 121 log_errx(1, "received Login PDU with unsupported " 122 "Version-max 0x%x", bhslr->bhslr_version_max); 123 } 124 if (bhslr->bhslr_version_min != 0x00) { 125 login_send_error(request, 0x02, 0x05); 126 log_errx(1, "received Login PDU with unsupported " 127 "Version-min 0x%x", bhslr->bhslr_version_min); 128 } 129 if (ISCSI_SNLT(ntohl(bhslr->bhslr_cmdsn), conn->conn_cmdsn)) { 130 login_send_error(request, 0x02, 0x05); 131 log_errx(1, "received Login PDU with decreasing CmdSN: " 132 "was %u, is %u", conn->conn_cmdsn, 133 ntohl(bhslr->bhslr_cmdsn)); 134 } 135 if (initial == false && 136 ntohl(bhslr->bhslr_expstatsn) != conn->conn_statsn) { 137 login_send_error(request, 0x02, 0x05); 138 log_errx(1, "received Login PDU with wrong ExpStatSN: " 139 "is %u, should be %u", ntohl(bhslr->bhslr_expstatsn), 140 conn->conn_statsn); 141 } 142 conn->conn_cmdsn = ntohl(bhslr->bhslr_cmdsn); 143 144 return (request); 145} 146 147static struct pdu * 148login_new_response(struct pdu *request) 149{ 150 struct pdu *response; 151 struct connection *conn; 152 struct iscsi_bhs_login_request *bhslr; 153 struct iscsi_bhs_login_response *bhslr2; 154 155 bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs; 156 conn = request->pdu_connection; 157 158 response = pdu_new_response(request); 159 bhslr2 = (struct iscsi_bhs_login_response *)response->pdu_bhs; 160 bhslr2->bhslr_opcode = ISCSI_BHS_OPCODE_LOGIN_RESPONSE; 161 login_set_csg(response, BHSLR_STAGE_SECURITY_NEGOTIATION); 162 memcpy(bhslr2->bhslr_isid, 163 bhslr->bhslr_isid, sizeof(bhslr2->bhslr_isid)); 164 bhslr2->bhslr_initiator_task_tag = bhslr->bhslr_initiator_task_tag; 165 bhslr2->bhslr_statsn = htonl(conn->conn_statsn++); 166 bhslr2->bhslr_expcmdsn = htonl(conn->conn_cmdsn); 167 bhslr2->bhslr_maxcmdsn = htonl(conn->conn_cmdsn); 168 169 return (response); 170} 171 172static void 173login_send_error(struct pdu *request, char class, char detail) 174{ 175 struct pdu *response; 176 struct iscsi_bhs_login_response *bhslr2; 177 178 log_debugx("sending Login Response PDU with failure class 0x%x/0x%x; " 179 "see next line for reason", class, detail); 180 response = login_new_response(request); 181 bhslr2 = (struct iscsi_bhs_login_response *)response->pdu_bhs; 182 bhslr2->bhslr_status_class = class; 183 bhslr2->bhslr_status_detail = detail; 184 185 pdu_send(response); 186 pdu_delete(response); 187} 188 189static int 190login_list_contains(const char *list, const char *what) 191{ 192 char *tofree, *str, *token; 193 194 tofree = str = checked_strdup(list); 195 196 while ((token = strsep(&str, ",")) != NULL) { 197 if (strcmp(token, what) == 0) { 198 free(tofree); 199 return (1); 200 } 201 } 202 free(tofree); 203 return (0); 204} 205 206static int 207login_list_prefers(const char *list, 208 const char *choice1, const char *choice2) 209{ 210 char *tofree, *str, *token; 211 212 tofree = str = checked_strdup(list); 213 214 while ((token = strsep(&str, ",")) != NULL) { 215 if (strcmp(token, choice1) == 0) { 216 free(tofree); 217 return (1); 218 } 219 if (strcmp(token, choice2) == 0) { 220 free(tofree); 221 return (2); 222 } 223 } 224 free(tofree); 225 return (-1); 226} 227 228static struct pdu * 229login_receive_chap_a(struct connection *conn) 230{ 231 struct pdu *request; 232 struct keys *request_keys; 233 const char *chap_a; 234 235 request = login_receive(conn, false); 236 request_keys = keys_new(); 237 keys_load(request_keys, request); 238 239 chap_a = keys_find(request_keys, "CHAP_A"); 240 if (chap_a == NULL) { 241 login_send_error(request, 0x02, 0x07); 242 log_errx(1, "received CHAP Login PDU without CHAP_A"); 243 } 244 if (login_list_contains(chap_a, "5") == 0) { 245 login_send_error(request, 0x02, 0x01); 246 log_errx(1, "received CHAP Login PDU with unsupported CHAP_A " 247 "\"%s\"", chap_a); 248 } 249 keys_delete(request_keys); 250 251 return (request); 252} 253 254static void 255login_send_chap_c(struct pdu *request, struct chap *chap) 256{ 257 struct pdu *response; 258 struct keys *response_keys; 259 char *chap_c, *chap_i; 260 261 chap_c = chap_get_challenge(chap); 262 chap_i = chap_get_id(chap); 263 264 response = login_new_response(request); 265 response_keys = keys_new(); 266 keys_add(response_keys, "CHAP_A", "5"); 267 keys_add(response_keys, "CHAP_I", chap_i); 268 keys_add(response_keys, "CHAP_C", chap_c); 269 free(chap_i); 270 free(chap_c); 271 keys_save(response_keys, response); 272 pdu_send(response); 273 pdu_delete(response); 274 keys_delete(response_keys); 275} 276 277static struct pdu * 278login_receive_chap_r(struct connection *conn, struct auth_group *ag, 279 struct chap *chap, const struct auth **authp) 280{ 281 struct pdu *request; 282 struct keys *request_keys; 283 const char *chap_n, *chap_r; 284 const struct auth *auth; 285 int error; 286 287 request = login_receive(conn, false); 288 request_keys = keys_new(); 289 keys_load(request_keys, request); 290 291 chap_n = keys_find(request_keys, "CHAP_N"); 292 if (chap_n == NULL) { 293 login_send_error(request, 0x02, 0x07); 294 log_errx(1, "received CHAP Login PDU without CHAP_N"); 295 } 296 chap_r = keys_find(request_keys, "CHAP_R"); 297 if (chap_r == NULL) { 298 login_send_error(request, 0x02, 0x07); 299 log_errx(1, "received CHAP Login PDU without CHAP_R"); 300 } 301 error = chap_receive(chap, chap_r); 302 if (error != 0) { 303 login_send_error(request, 0x02, 0x07); 304 log_errx(1, "received CHAP Login PDU with malformed CHAP_R"); 305 } 306 307 /* 308 * Verify the response. 309 */ 310 assert(ag->ag_type == AG_TYPE_CHAP || 311 ag->ag_type == AG_TYPE_CHAP_MUTUAL); 312 auth = auth_find(ag, chap_n); 313 if (auth == NULL) { 314 login_send_error(request, 0x02, 0x01); 315 log_errx(1, "received CHAP Login with invalid user \"%s\"", 316 chap_n); 317 } 318 319 assert(auth->a_secret != NULL); 320 assert(strlen(auth->a_secret) > 0); 321 322 error = chap_authenticate(chap, auth->a_secret); 323 if (error != 0) { 324 login_send_error(request, 0x02, 0x01); 325 log_errx(1, "CHAP authentication failed for user \"%s\"", 326 auth->a_user); 327 } 328 329 keys_delete(request_keys); 330 331 *authp = auth; 332 return (request); 333} 334 335static void 336login_send_chap_success(struct pdu *request, 337 const struct auth *auth) 338{ 339 struct pdu *response; 340 struct keys *request_keys, *response_keys; 341 struct rchap *rchap; 342 const char *chap_i, *chap_c; 343 char *chap_r; 344 int error; 345 346 response = login_new_response(request); 347 login_set_nsg(response, BHSLR_STAGE_OPERATIONAL_NEGOTIATION); 348 349 /* 350 * Actually, one more thing: mutual authentication. 351 */ 352 request_keys = keys_new(); 353 keys_load(request_keys, request); 354 chap_i = keys_find(request_keys, "CHAP_I"); 355 chap_c = keys_find(request_keys, "CHAP_C"); 356 if (chap_i != NULL || chap_c != NULL) { 357 if (chap_i == NULL) { 358 login_send_error(request, 0x02, 0x07); 359 log_errx(1, "initiator requested target " 360 "authentication, but didn't send CHAP_I"); 361 } 362 if (chap_c == NULL) { 363 login_send_error(request, 0x02, 0x07); 364 log_errx(1, "initiator requested target " 365 "authentication, but didn't send CHAP_C"); 366 } 367 if (auth->a_auth_group->ag_type != AG_TYPE_CHAP_MUTUAL) { 368 login_send_error(request, 0x02, 0x01); 369 log_errx(1, "initiator requests target authentication " 370 "for user \"%s\", but mutual user/secret " 371 "is not set", auth->a_user); 372 } 373 374 log_debugx("performing mutual authentication as user \"%s\"", 375 auth->a_mutual_user); 376 377 rchap = rchap_new(auth->a_mutual_secret); 378 error = rchap_receive(rchap, chap_i, chap_c); 379 if (error != 0) { 380 login_send_error(request, 0x02, 0x07); 381 log_errx(1, "received CHAP Login PDU with malformed " 382 "CHAP_I or CHAP_C"); 383 } 384 chap_r = rchap_get_response(rchap); 385 rchap_delete(rchap); 386 response_keys = keys_new(); 387 keys_add(response_keys, "CHAP_N", auth->a_mutual_user); 388 keys_add(response_keys, "CHAP_R", chap_r); 389 free(chap_r); 390 keys_save(response_keys, response); 391 keys_delete(response_keys); 392 } else { 393 log_debugx("initiator did not request target authentication"); 394 } 395 396 keys_delete(request_keys); 397 pdu_send(response); 398 pdu_delete(response); 399} 400 401static void 402login_chap(struct connection *conn, struct auth_group *ag) 403{ 404 const struct auth *auth; 405 struct chap *chap; 406 struct pdu *request; 407 408 /* 409 * Receive CHAP_A PDU. 410 */ 411 log_debugx("beginning CHAP authentication; waiting for CHAP_A"); 412 request = login_receive_chap_a(conn); 413 414 /* 415 * Generate the challenge. 416 */ 417 chap = chap_new(); 418 419 /* 420 * Send the challenge. 421 */ 422 log_debugx("sending CHAP_C, binary challenge size is %zd bytes", 423 sizeof(chap->chap_challenge)); 424 login_send_chap_c(request, chap); 425 pdu_delete(request); 426 427 /* 428 * Receive CHAP_N/CHAP_R PDU and authenticate. 429 */ 430 log_debugx("waiting for CHAP_N/CHAP_R"); 431 request = login_receive_chap_r(conn, ag, chap, &auth); 432 433 /* 434 * Yay, authentication succeeded! 435 */ 436 log_debugx("authentication succeeded for user \"%s\"; " 437 "transitioning to Negotiation Phase", auth->a_user); 438 login_send_chap_success(request, auth); 439 pdu_delete(request); 440 441 /* 442 * Leave username and CHAP information for discovery(). 443 */ 444 conn->conn_user = auth->a_user; 445 conn->conn_chap = chap; 446} 447 448static void 449login_negotiate_key(struct pdu *request, const char *name, 450 const char *value, bool skipped_security, struct keys *response_keys) 451{ 452 int which, tmp; 453 struct connection *conn; 454 455 conn = request->pdu_connection; 456 457 if (strcmp(name, "InitiatorName") == 0) { 458 if (!skipped_security) 459 log_errx(1, "initiator resent InitiatorName"); 460 } else if (strcmp(name, "SessionType") == 0) { 461 if (!skipped_security) 462 log_errx(1, "initiator resent SessionType"); 463 } else if (strcmp(name, "TargetName") == 0) { 464 if (!skipped_security) 465 log_errx(1, "initiator resent TargetName"); 466 } else if (strcmp(name, "InitiatorAlias") == 0) { 467 if (conn->conn_initiator_alias != NULL) 468 free(conn->conn_initiator_alias); 469 conn->conn_initiator_alias = checked_strdup(value); 470 } else if (strcmp(value, "Irrelevant") == 0) { 471 /* Ignore. */ 472 } else if (strcmp(name, "HeaderDigest") == 0) { 473 /* 474 * We don't handle digests for discovery sessions. 475 */ 476 if (conn->conn_session_type == CONN_SESSION_TYPE_DISCOVERY) { 477 log_debugx("discovery session; digests disabled"); 478 keys_add(response_keys, name, "None"); 479 return; 480 } 481 482 which = login_list_prefers(value, "CRC32C", "None"); 483 switch (which) { 484 case 1: 485 log_debugx("initiator prefers CRC32C " 486 "for header digest; we'll use it"); 487 conn->conn_header_digest = CONN_DIGEST_CRC32C; 488 keys_add(response_keys, name, "CRC32C"); 489 break; 490 case 2: 491 log_debugx("initiator prefers not to do " 492 "header digest; we'll comply"); 493 keys_add(response_keys, name, "None"); 494 break; 495 default: 496 log_warnx("initiator sent unrecognized " 497 "HeaderDigest value \"%s\"; will use None", value); 498 keys_add(response_keys, name, "None"); 499 break; 500 } 501 } else if (strcmp(name, "DataDigest") == 0) { 502 if (conn->conn_session_type == CONN_SESSION_TYPE_DISCOVERY) { 503 log_debugx("discovery session; digests disabled"); 504 keys_add(response_keys, name, "None"); 505 return; 506 } 507 508 which = login_list_prefers(value, "CRC32C", "None"); 509 switch (which) { 510 case 1: 511 log_debugx("initiator prefers CRC32C " 512 "for data digest; we'll use it"); 513 conn->conn_data_digest = CONN_DIGEST_CRC32C; 514 keys_add(response_keys, name, "CRC32C"); 515 break; 516 case 2: 517 log_debugx("initiator prefers not to do " 518 "data digest; we'll comply"); 519 keys_add(response_keys, name, "None"); 520 break; 521 default: 522 log_warnx("initiator sent unrecognized " 523 "DataDigest value \"%s\"; will use None", value); 524 keys_add(response_keys, name, "None"); 525 break; 526 } 527 } else if (strcmp(name, "MaxConnections") == 0) { 528 keys_add(response_keys, name, "1"); 529 } else if (strcmp(name, "InitialR2T") == 0) { 530 keys_add(response_keys, name, "Yes"); 531 } else if (strcmp(name, "ImmediateData") == 0) { 532 if (conn->conn_session_type == CONN_SESSION_TYPE_DISCOVERY) { 533 log_debugx("discovery session; ImmediateData irrelevant"); 534 keys_add(response_keys, name, "Irrelevant"); 535 } else { 536 if (strcmp(value, "Yes") == 0) { 537 conn->conn_immediate_data = true; 538 keys_add(response_keys, name, "Yes"); 539 } else { 540 conn->conn_immediate_data = false; 541 keys_add(response_keys, name, "No"); 542 } 543 } 544 } else if (strcmp(name, "MaxRecvDataSegmentLength") == 0) { 545 tmp = strtoul(value, NULL, 10); 546 if (tmp <= 0) { 547 login_send_error(request, 0x02, 0x00); 548 log_errx(1, "received invalid " 549 "MaxRecvDataSegmentLength"); 550 } 551 if (tmp > MAX_DATA_SEGMENT_LENGTH) { 552 log_debugx("capping MaxRecvDataSegmentLength " 553 "from %d to %d", tmp, MAX_DATA_SEGMENT_LENGTH); 554 tmp = MAX_DATA_SEGMENT_LENGTH; 555 } 556 conn->conn_max_data_segment_length = tmp; 557 keys_add_int(response_keys, name, MAX_DATA_SEGMENT_LENGTH); 558 } else if (strcmp(name, "MaxBurstLength") == 0) { 559 tmp = strtoul(value, NULL, 10); 560 if (tmp <= 0) { 561 login_send_error(request, 0x02, 0x00); 562 log_errx(1, "received invalid MaxBurstLength"); 563 } 564 if (tmp > MAX_BURST_LENGTH) { 565 log_debugx("capping MaxBurstLength from %d to %d", 566 tmp, MAX_BURST_LENGTH); 567 tmp = MAX_BURST_LENGTH; 568 } 569 conn->conn_max_burst_length = tmp; 570 keys_add(response_keys, name, value); 571 } else if (strcmp(name, "FirstBurstLength") == 0) { 572 tmp = strtoul(value, NULL, 10); 573 if (tmp <= 0) { 574 login_send_error(request, 0x02, 0x00); 575 log_errx(1, "received invalid " 576 "FirstBurstLength"); 577 } 578 if (tmp > MAX_DATA_SEGMENT_LENGTH) { 579 log_debugx("capping FirstBurstLength from %d to %d", 580 tmp, MAX_DATA_SEGMENT_LENGTH); 581 tmp = MAX_DATA_SEGMENT_LENGTH; 582 } 583 /* 584 * We don't pass the value to the kernel; it only enforces 585 * hardcoded limit anyway. 586 */ 587 keys_add_int(response_keys, name, tmp); 588 } else if (strcmp(name, "DefaultTime2Wait") == 0) { 589 keys_add(response_keys, name, value); 590 } else if (strcmp(name, "DefaultTime2Retain") == 0) { 591 keys_add(response_keys, name, "0"); 592 } else if (strcmp(name, "MaxOutstandingR2T") == 0) { 593 keys_add(response_keys, name, "1"); 594 } else if (strcmp(name, "DataPDUInOrder") == 0) { 595 keys_add(response_keys, name, "Yes"); 596 } else if (strcmp(name, "DataSequenceInOrder") == 0) { 597 keys_add(response_keys, name, "Yes"); 598 } else if (strcmp(name, "ErrorRecoveryLevel") == 0) { 599 keys_add(response_keys, name, "0"); 600 } else if (strcmp(name, "OFMarker") == 0) { 601 keys_add(response_keys, name, "No"); 602 } else if (strcmp(name, "IFMarker") == 0) { 603 keys_add(response_keys, name, "No"); 604 } else if (strcmp(name, "iSCSIProtocolLevel") == 0) { 605 tmp = strtoul(value, NULL, 10); 606 if (tmp > 2) 607 tmp = 2; 608 keys_add_int(response_keys, name, tmp); 609 } else { 610 log_debugx("unknown key \"%s\"; responding " 611 "with NotUnderstood", name); 612 keys_add(response_keys, name, "NotUnderstood"); 613 } 614} 615 616static void 617login_redirect(struct pdu *request, const char *target_address) 618{ 619 struct pdu *response; 620 struct iscsi_bhs_login_response *bhslr2; 621 struct keys *response_keys; 622 623 response = login_new_response(request); 624 login_set_csg(response, login_csg(request)); 625 bhslr2 = (struct iscsi_bhs_login_response *)response->pdu_bhs; 626 bhslr2->bhslr_status_class = 0x01; 627 bhslr2->bhslr_status_detail = 0x01; 628 629 response_keys = keys_new(); 630 keys_add(response_keys, "TargetAddress", target_address); 631 632 keys_save(response_keys, response); 633 pdu_send(response); 634 pdu_delete(response); 635 keys_delete(response_keys); 636} 637 638static bool 639login_portal_redirect(struct connection *conn, struct pdu *request) 640{ 641 const struct portal_group *pg; 642 643 pg = conn->conn_portal->p_portal_group; 644 if (pg->pg_redirection == NULL) 645 return (false); 646 647 log_debugx("portal-group \"%s\" configured to redirect to %s", 648 pg->pg_name, pg->pg_redirection); 649 login_redirect(request, pg->pg_redirection); 650 651 return (true); 652} 653 654static bool 655login_target_redirect(struct connection *conn, struct pdu *request) 656{ 657 const char *target_address; 658 659 assert(conn->conn_portal->p_portal_group->pg_redirection == NULL); 660 661 if (conn->conn_target == NULL) 662 return (false); 663 664 target_address = conn->conn_target->t_redirection; 665 if (target_address == NULL) 666 return (false); 667 668 log_debugx("target \"%s\" configured to redirect to %s", 669 conn->conn_target->t_name, target_address); 670 login_redirect(request, target_address); 671 672 return (true); 673} 674 675static void 676login_negotiate(struct connection *conn, struct pdu *request) 677{ 678 struct pdu *response; 679 struct iscsi_bhs_login_response *bhslr2; 680 struct keys *request_keys, *response_keys; 681 int i; 682 bool redirected, skipped_security; 683 684 if (request == NULL) { 685 log_debugx("beginning operational parameter negotiation; " 686 "waiting for Login PDU"); 687 request = login_receive(conn, false); 688 skipped_security = false; 689 } else 690 skipped_security = true; 691 692 /* 693 * RFC 3720, 10.13.5. Status-Class and Status-Detail, says 694 * the redirection SHOULD be accepted by the initiator before 695 * authentication, but MUST be be accepted afterwards; that's 696 * why we're doing it here and not earlier. 697 */ 698 redirected = login_target_redirect(conn, request); 699 if (redirected) { 700 log_debugx("initiator redirected; exiting"); 701 exit(0); 702 } 703 704 request_keys = keys_new(); 705 keys_load(request_keys, request); 706 707 response = login_new_response(request); 708 bhslr2 = (struct iscsi_bhs_login_response *)response->pdu_bhs; 709 bhslr2->bhslr_tsih = htons(0xbadd); 710 login_set_csg(response, BHSLR_STAGE_OPERATIONAL_NEGOTIATION); 711 login_set_nsg(response, BHSLR_STAGE_FULL_FEATURE_PHASE); 712 response_keys = keys_new(); 713 714 if (skipped_security && 715 conn->conn_session_type == CONN_SESSION_TYPE_NORMAL) { 716 if (conn->conn_target->t_alias != NULL) 717 keys_add(response_keys, 718 "TargetAlias", conn->conn_target->t_alias); 719 keys_add_int(response_keys, "TargetPortalGroupTag", 720 conn->conn_portal->p_portal_group->pg_tag); 721 } 722 723 for (i = 0; i < KEYS_MAX; i++) { 724 if (request_keys->keys_names[i] == NULL) 725 break; 726 727 login_negotiate_key(request, request_keys->keys_names[i], 728 request_keys->keys_values[i], skipped_security, 729 response_keys); 730 } 731 732 log_debugx("operational parameter negotiation done; " 733 "transitioning to Full Feature Phase"); 734 735 keys_save(response_keys, response); 736 pdu_send(response); 737 pdu_delete(response); 738 keys_delete(response_keys); 739 pdu_delete(request); 740 keys_delete(request_keys); 741} 742 743static void 744login_wait_transition(struct connection *conn) 745{ 746 struct pdu *request, *response; 747 struct iscsi_bhs_login_request *bhslr; 748 749 log_debugx("waiting for state transition request"); 750 request = login_receive(conn, false); 751 bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs; 752 if ((bhslr->bhslr_flags & BHSLR_FLAGS_TRANSIT) == 0) { 753 login_send_error(request, 0x02, 0x00); 754 log_errx(1, "got no \"T\" flag after answering AuthMethod"); 755 } 756 pdu_delete(request); 757 758 log_debugx("got state transition request"); 759 response = login_new_response(request); 760 login_set_nsg(response, BHSLR_STAGE_OPERATIONAL_NEGOTIATION); 761 pdu_send(response); 762 pdu_delete(response); 763 764 login_negotiate(conn, NULL); 765} 766 767void 768login(struct connection *conn) 769{ 770 struct pdu *request, *response; 771 struct iscsi_bhs_login_request *bhslr; 772 struct keys *request_keys, *response_keys; 773 struct auth_group *ag; 774 struct portal_group *pg; 775 const char *initiator_name, *initiator_alias, *session_type, 776 *target_name, *auth_method; 777 bool redirected, fail, trans; 778 779 /* 780 * Handle the initial Login Request - figure out required authentication 781 * method and either transition to the next phase, if no authentication 782 * is required, or call appropriate authentication code. 783 */ 784 log_debugx("beginning Login Phase; waiting for Login PDU"); 785 request = login_receive(conn, true); 786 bhslr = (struct iscsi_bhs_login_request *)request->pdu_bhs; 787 if (bhslr->bhslr_tsih != 0) { 788 login_send_error(request, 0x02, 0x0a); 789 log_errx(1, "received Login PDU with non-zero TSIH"); 790 } 791 792 pg = conn->conn_portal->p_portal_group; 793 794 memcpy(conn->conn_initiator_isid, bhslr->bhslr_isid, 795 sizeof(conn->conn_initiator_isid)); 796 797 /* 798 * XXX: Implement the C flag some day. 799 */ 800 request_keys = keys_new(); 801 keys_load(request_keys, request); 802 803 assert(conn->conn_initiator_name == NULL); 804 initiator_name = keys_find(request_keys, "InitiatorName"); 805 if (initiator_name == NULL) { 806 login_send_error(request, 0x02, 0x07); 807 log_errx(1, "received Login PDU without InitiatorName"); 808 } 809 if (valid_iscsi_name(initiator_name) == false) { 810 login_send_error(request, 0x02, 0x00); 811 log_errx(1, "received Login PDU with invalid InitiatorName"); 812 } 813 conn->conn_initiator_name = checked_strdup(initiator_name); 814 log_set_peer_name(conn->conn_initiator_name); 815 setproctitle("%s (%s)", conn->conn_initiator_addr, conn->conn_initiator_name); 816 817 redirected = login_portal_redirect(conn, request); 818 if (redirected) { 819 log_debugx("initiator redirected; exiting"); 820 exit(0); 821 } 822 823 initiator_alias = keys_find(request_keys, "InitiatorAlias"); 824 if (initiator_alias != NULL) 825 conn->conn_initiator_alias = checked_strdup(initiator_alias); 826 827 assert(conn->conn_session_type == CONN_SESSION_TYPE_NONE); 828 session_type = keys_find(request_keys, "SessionType"); 829 if (session_type != NULL) { 830 if (strcmp(session_type, "Normal") == 0) { 831 conn->conn_session_type = CONN_SESSION_TYPE_NORMAL; 832 } else if (strcmp(session_type, "Discovery") == 0) { 833 conn->conn_session_type = CONN_SESSION_TYPE_DISCOVERY; 834 } else { 835 login_send_error(request, 0x02, 0x00); 836 log_errx(1, "received Login PDU with invalid " 837 "SessionType \"%s\"", session_type); 838 } 839 } else 840 conn->conn_session_type = CONN_SESSION_TYPE_NORMAL; 841 842 assert(conn->conn_target == NULL); 843 if (conn->conn_session_type == CONN_SESSION_TYPE_NORMAL) { 844 target_name = keys_find(request_keys, "TargetName"); 845 if (target_name == NULL) { 846 login_send_error(request, 0x02, 0x07); 847 log_errx(1, "received Login PDU without TargetName"); 848 } 849 850 conn->conn_port = port_find_in_pg(pg, target_name); 851 if (conn->conn_port == NULL) { 852 login_send_error(request, 0x02, 0x03); 853 log_errx(1, "requested target \"%s\" not found", 854 target_name); 855 } 856 conn->conn_target = conn->conn_port->p_target; 857 } 858 859 /* 860 * At this point we know what kind of authentication we need. 861 */ 862 if (conn->conn_session_type == CONN_SESSION_TYPE_NORMAL) { 863 ag = conn->conn_port->p_auth_group; 864 if (ag == NULL) 865 ag = conn->conn_target->t_auth_group; 866 if (ag->ag_name != NULL) { 867 log_debugx("initiator requests to connect " 868 "to target \"%s\"; auth-group \"%s\"", 869 conn->conn_target->t_name, 870 ag->ag_name); 871 } else { 872 log_debugx("initiator requests to connect " 873 "to target \"%s\"", conn->conn_target->t_name); 874 } 875 } else { 876 assert(conn->conn_session_type == CONN_SESSION_TYPE_DISCOVERY); 877 ag = pg->pg_discovery_auth_group; 878 if (ag->ag_name != NULL) { 879 log_debugx("initiator requests " 880 "discovery session; auth-group \"%s\"", ag->ag_name); 881 } else { 882 log_debugx("initiator requests discovery session"); 883 } 884 } 885 886 if (ag->ag_type == AG_TYPE_DENY) { 887 login_send_error(request, 0x02, 0x01); 888 log_errx(1, "auth-type is \"deny\""); 889 } 890 891 if (ag->ag_type == AG_TYPE_UNKNOWN) { 892 /* 893 * This can happen with empty auth-group. 894 */ 895 login_send_error(request, 0x02, 0x01); 896 log_errx(1, "auth-type not set, denying access"); 897 } 898 899 /* 900 * Enforce initiator-name and initiator-portal. 901 */ 902 if (auth_name_check(ag, initiator_name) != 0) { 903 login_send_error(request, 0x02, 0x02); 904 log_errx(1, "initiator does not match allowed initiator names"); 905 } 906 907 if (auth_portal_check(ag, &conn->conn_initiator_sa) != 0) { 908 login_send_error(request, 0x02, 0x02); 909 log_errx(1, "initiator does not match allowed " 910 "initiator portals"); 911 } 912 913 /* 914 * Let's see if the initiator intends to do any kind of authentication 915 * at all. 916 */ 917 if (login_csg(request) == BHSLR_STAGE_OPERATIONAL_NEGOTIATION) { 918 if (ag->ag_type != AG_TYPE_NO_AUTHENTICATION) { 919 login_send_error(request, 0x02, 0x01); 920 log_errx(1, "initiator skipped the authentication, " 921 "but authentication is required"); 922 } 923 924 keys_delete(request_keys); 925 926 log_debugx("initiator skipped the authentication, " 927 "and we don't need it; proceeding with negotiation"); 928 login_negotiate(conn, request); 929 return; 930 } 931 932 fail = false; 933 response = login_new_response(request); 934 response_keys = keys_new(); 935 trans = (bhslr->bhslr_flags & BHSLR_FLAGS_TRANSIT) != 0; 936 auth_method = keys_find(request_keys, "AuthMethod"); 937 if (ag->ag_type == AG_TYPE_NO_AUTHENTICATION) { 938 log_debugx("authentication not required"); 939 if (auth_method == NULL || 940 login_list_contains(auth_method, "None")) { 941 keys_add(response_keys, "AuthMethod", "None"); 942 } else { 943 log_warnx("initiator requests " 944 "AuthMethod \"%s\" instead of \"None\"", 945 auth_method); 946 keys_add(response_keys, "AuthMethod", "Reject"); 947 } 948 if (trans) 949 login_set_nsg(response, BHSLR_STAGE_OPERATIONAL_NEGOTIATION); 950 } else { 951 log_debugx("CHAP authentication required"); 952 if (auth_method == NULL || 953 login_list_contains(auth_method, "CHAP")) { 954 keys_add(response_keys, "AuthMethod", "CHAP"); 955 } else { 956 log_warnx("initiator requests unsupported " 957 "AuthMethod \"%s\" instead of \"CHAP\"", 958 auth_method); 959 keys_add(response_keys, "AuthMethod", "Reject"); 960 fail = true; 961 } 962 } 963 if (conn->conn_session_type == CONN_SESSION_TYPE_NORMAL) { 964 if (conn->conn_target->t_alias != NULL) 965 keys_add(response_keys, 966 "TargetAlias", conn->conn_target->t_alias); 967 keys_add_int(response_keys, 968 "TargetPortalGroupTag", pg->pg_tag); 969 } 970 keys_save(response_keys, response); 971 972 pdu_send(response); 973 pdu_delete(response); 974 keys_delete(response_keys); 975 pdu_delete(request); 976 keys_delete(request_keys); 977 978 if (fail) { 979 log_debugx("sent reject for AuthMethod; exiting"); 980 exit(1); 981 } 982 983 if (ag->ag_type != AG_TYPE_NO_AUTHENTICATION) { 984 login_chap(conn, ag); 985 login_negotiate(conn, NULL); 986 } else if (trans) { 987 login_negotiate(conn, NULL); 988 } else { 989 login_wait_transition(conn); 990 } 991} 992