1 /* $NetBSD: kpasswdd.c,v 1.3 2014/04/24 13:45:34 pettai Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2005 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 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 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 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. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "kpasswd_locl.h" 37 __RCSID("NetBSD"); 38 39 #include <kadm5/admin.h> 40 #ifdef HAVE_SYS_UN_H 41 #include <sys/un.h> 42 #endif 43 #include <krb5/hdb.h> 44 #include <kadm5/private.h> 45 46 static krb5_context context; 47 static krb5_log_facility *log_facility; 48 49 static struct getarg_strings addresses_str; 50 krb5_addresses explicit_addresses; 51 52 static sig_atomic_t exit_flag = 0; 53 54 static void 55 add_one_address (const char *str, int first) 56 { 57 krb5_error_code ret; 58 krb5_addresses tmp; 59 60 ret = krb5_parse_address (context, str, &tmp); 61 if (ret) 62 krb5_err (context, 1, ret, "parse_address `%s'", str); 63 if (first) 64 krb5_copy_addresses(context, &tmp, &explicit_addresses); 65 else 66 krb5_append_addresses(context, &explicit_addresses, &tmp); 67 krb5_free_addresses (context, &tmp); 68 } 69 70 static void 71 send_reply (int s, 72 struct sockaddr *sa, 73 int sa_size, 74 krb5_data *ap_rep, 75 krb5_data *rest) 76 { 77 struct msghdr msghdr; 78 struct iovec iov[3]; 79 uint16_t len, ap_rep_len; 80 u_char header[6]; 81 u_char *p; 82 83 if (ap_rep) 84 ap_rep_len = ap_rep->length; 85 else 86 ap_rep_len = 0; 87 88 len = 6 + ap_rep_len + rest->length; 89 p = header; 90 *p++ = (len >> 8) & 0xFF; 91 *p++ = (len >> 0) & 0xFF; 92 *p++ = 0; 93 *p++ = 1; 94 *p++ = (ap_rep_len >> 8) & 0xFF; 95 *p++ = (ap_rep_len >> 0) & 0xFF; 96 97 memset (&msghdr, 0, sizeof(msghdr)); 98 msghdr.msg_name = (void *)sa; 99 msghdr.msg_namelen = sa_size; 100 msghdr.msg_iov = iov; 101 msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov); 102 #if 0 103 msghdr.msg_control = NULL; 104 msghdr.msg_controllen = 0; 105 #endif 106 107 iov[0].iov_base = (char *)header; 108 iov[0].iov_len = 6; 109 if (ap_rep_len) { 110 iov[1].iov_base = ap_rep->data; 111 iov[1].iov_len = ap_rep->length; 112 } else { 113 iov[1].iov_base = NULL; 114 iov[1].iov_len = 0; 115 } 116 iov[2].iov_base = rest->data; 117 iov[2].iov_len = rest->length; 118 119 if (sendmsg (s, &msghdr, 0) < 0) 120 krb5_warn (context, errno, "sendmsg"); 121 } 122 123 static int 124 make_result (krb5_data *data, 125 uint16_t result_code, 126 const char *expl) 127 { 128 krb5_error_code ret; 129 krb5_storage *sp; 130 131 sp = krb5_storage_emem(); 132 if (sp == NULL) goto out; 133 ret = krb5_store_uint16(sp, result_code); 134 if (ret) goto out; 135 ret = krb5_store_stringz(sp, expl); 136 if (ret) goto out; 137 ret = krb5_storage_to_data(sp, data); 138 if (ret) goto out; 139 krb5_storage_free(sp); 140 141 return 0; 142 out: 143 if (sp) 144 krb5_storage_free(sp); 145 146 krb5_warnx (context, "Out of memory generating error reply"); 147 return 1; 148 } 149 150 static void 151 reply_error (krb5_realm realm, 152 int s, 153 struct sockaddr *sa, 154 int sa_size, 155 krb5_error_code error_code, 156 uint16_t result_code, 157 const char *expl) 158 { 159 krb5_error_code ret; 160 krb5_data error_data; 161 krb5_data e_data; 162 krb5_principal server = NULL; 163 164 if (make_result(&e_data, result_code, expl)) 165 return; 166 167 if (realm) { 168 ret = krb5_make_principal (context, &server, realm, 169 "kadmin", "changepw", NULL); 170 if (ret) { 171 krb5_data_free (&e_data); 172 return; 173 } 174 } 175 176 ret = krb5_mk_error (context, 177 error_code, 178 NULL, 179 &e_data, 180 NULL, 181 server, 182 NULL, 183 NULL, 184 &error_data); 185 if (server) 186 krb5_free_principal(context, server); 187 krb5_data_free (&e_data); 188 if (ret) { 189 krb5_warn (context, ret, "Could not even generate error reply"); 190 return; 191 } 192 send_reply (s, sa, sa_size, NULL, &error_data); 193 krb5_data_free (&error_data); 194 } 195 196 static void 197 reply_priv (krb5_auth_context auth_context, 198 int s, 199 struct sockaddr *sa, 200 int sa_size, 201 uint16_t result_code, 202 const char *expl) 203 { 204 krb5_error_code ret; 205 krb5_data krb_priv_data; 206 krb5_data ap_rep_data; 207 krb5_data e_data; 208 209 ret = krb5_mk_rep (context, 210 auth_context, 211 &ap_rep_data); 212 if (ret) { 213 krb5_warn (context, ret, "Could not even generate error reply"); 214 return; 215 } 216 217 if (make_result(&e_data, result_code, expl)) 218 return; 219 220 ret = krb5_mk_priv (context, 221 auth_context, 222 &e_data, 223 &krb_priv_data, 224 NULL); 225 krb5_data_free (&e_data); 226 if (ret) { 227 krb5_warn (context, ret, "Could not even generate error reply"); 228 return; 229 } 230 send_reply (s, sa, sa_size, &ap_rep_data, &krb_priv_data); 231 krb5_data_free (&ap_rep_data); 232 krb5_data_free (&krb_priv_data); 233 } 234 235 /* 236 * Change the password for `principal', sending the reply back on `s' 237 * (`sa', `sa_size') to `pwd_data'. 238 */ 239 240 static void 241 change (krb5_auth_context auth_context, 242 krb5_principal admin_principal, 243 uint16_t version, 244 int s, 245 struct sockaddr *sa, 246 int sa_size, 247 krb5_data *in_data) 248 { 249 krb5_error_code ret; 250 char *client = NULL, *admin = NULL; 251 const char *pwd_reason; 252 kadm5_config_params conf; 253 void *kadm5_handle = NULL; 254 krb5_principal principal = NULL; 255 krb5_data *pwd_data = NULL; 256 char *tmp; 257 ChangePasswdDataMS chpw; 258 259 memset (&conf, 0, sizeof(conf)); 260 memset(&chpw, 0, sizeof(chpw)); 261 262 if (version == KRB5_KPASSWD_VERS_CHANGEPW) { 263 ret = krb5_copy_data(context, in_data, &pwd_data); 264 if (ret) { 265 krb5_warn (context, ret, "krb5_copy_data"); 266 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_MALFORMED, 267 "out out memory copying password"); 268 return; 269 } 270 principal = admin_principal; 271 } else if (version == KRB5_KPASSWD_VERS_SETPW) { 272 size_t len; 273 274 ret = decode_ChangePasswdDataMS(in_data->data, in_data->length, 275 &chpw, &len); 276 if (ret) { 277 krb5_warn (context, ret, "decode_ChangePasswdDataMS"); 278 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_MALFORMED, 279 "malformed ChangePasswdData"); 280 return; 281 } 282 283 284 ret = krb5_copy_data(context, &chpw.newpasswd, &pwd_data); 285 if (ret) { 286 krb5_warn (context, ret, "krb5_copy_data"); 287 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_MALFORMED, 288 "out out memory copying password"); 289 goto out; 290 } 291 292 if (chpw.targname == NULL && chpw.targrealm != NULL) { 293 krb5_warn (context, ret, "kadm5_init_with_password_ctx"); 294 reply_priv (auth_context, s, sa, sa_size, 295 KRB5_KPASSWD_MALFORMED, 296 "targrealm but not targname"); 297 goto out; 298 } 299 300 if (chpw.targname) { 301 krb5_principal_data princ; 302 303 princ.name = *chpw.targname; 304 princ.realm = *chpw.targrealm; 305 if (princ.realm == NULL) { 306 ret = krb5_get_default_realm(context, &princ.realm); 307 308 if (ret) { 309 krb5_warnx (context, 310 "kadm5_init_with_password_ctx: " 311 "failed to allocate realm"); 312 reply_priv (auth_context, s, sa, sa_size, 313 KRB5_KPASSWD_SOFTERROR, 314 "failed to allocate realm"); 315 goto out; 316 } 317 } 318 ret = krb5_copy_principal(context, &princ, &principal); 319 if (*chpw.targrealm == NULL) 320 free(princ.realm); 321 if (ret) { 322 krb5_warn(context, ret, "krb5_copy_principal"); 323 reply_priv(auth_context, s, sa, sa_size, 324 KRB5_KPASSWD_HARDERROR, 325 "failed to allocate principal"); 326 goto out; 327 } 328 } else 329 principal = admin_principal; 330 } else { 331 krb5_warnx (context, "kadm5_init_with_password_ctx: unknown proto"); 332 reply_priv (auth_context, s, sa, sa_size, 333 KRB5_KPASSWD_HARDERROR, 334 "Unknown protocol used"); 335 return; 336 } 337 338 ret = krb5_unparse_name (context, admin_principal, &admin); 339 if (ret) { 340 krb5_warn (context, ret, "unparse_name failed"); 341 reply_priv (auth_context, s, sa, sa_size, 342 KRB5_KPASSWD_HARDERROR, "out of memory error"); 343 goto out; 344 } 345 346 conf.realm = principal->realm; 347 conf.mask |= KADM5_CONFIG_REALM; 348 349 ret = kadm5_init_with_password_ctx(context, 350 admin, 351 NULL, 352 KADM5_ADMIN_SERVICE, 353 &conf, 0, 0, 354 &kadm5_handle); 355 if (ret) { 356 krb5_warn (context, ret, "kadm5_init_with_password_ctx"); 357 reply_priv (auth_context, s, sa, sa_size, 2, 358 "Internal error"); 359 goto out; 360 } 361 362 ret = krb5_unparse_name(context, principal, &client); 363 if (ret) { 364 krb5_warn (context, ret, "unparse_name failed"); 365 reply_priv (auth_context, s, sa, sa_size, 366 KRB5_KPASSWD_HARDERROR, "out of memory error"); 367 goto out; 368 } 369 370 /* 371 * Check password quality if not changing as administrator 372 */ 373 374 if (krb5_principal_compare(context, admin_principal, principal) == TRUE) { 375 376 pwd_reason = kadm5_check_password_quality (context, principal, 377 pwd_data); 378 if (pwd_reason != NULL ) { 379 krb5_warnx (context, 380 "%s didn't pass password quality check with error: %s", 381 client, pwd_reason); 382 reply_priv (auth_context, s, sa, sa_size, 383 KRB5_KPASSWD_SOFTERROR, pwd_reason); 384 goto out; 385 } 386 krb5_warnx (context, "Changing password for %s", client); 387 } else { 388 ret = _kadm5_acl_check_permission(kadm5_handle, KADM5_PRIV_CPW, 389 principal); 390 if (ret) { 391 krb5_warn (context, ret, 392 "Check ACL failed for %s for changing %s password", 393 admin, client); 394 reply_priv (auth_context, s, sa, sa_size, 395 KRB5_KPASSWD_HARDERROR, "permission denied"); 396 goto out; 397 } 398 krb5_warnx (context, "%s is changing password for %s", admin, client); 399 } 400 401 ret = krb5_data_realloc(pwd_data, pwd_data->length + 1); 402 if (ret) { 403 krb5_warn (context, ret, "malloc: out of memory"); 404 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_HARDERROR, 405 "Internal error"); 406 goto out; 407 } 408 tmp = pwd_data->data; 409 tmp[pwd_data->length - 1] = '\0'; 410 411 ret = kadm5_s_chpass_principal_cond (kadm5_handle, principal, tmp); 412 krb5_free_data (context, pwd_data); 413 pwd_data = NULL; 414 if (ret) { 415 const char *str = krb5_get_error_message(context, ret); 416 krb5_warnx(context, "kadm5_s_chpass_principal_cond: %s", str); 417 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_SOFTERROR, 418 str ? str : "Internal error"); 419 krb5_free_error_message(context, str); 420 goto out; 421 } 422 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_SUCCESS, 423 "Password changed"); 424 out: 425 free_ChangePasswdDataMS(&chpw); 426 if (principal != admin_principal) 427 krb5_free_principal(context, principal); 428 if (admin) 429 free(admin); 430 if (client) 431 free(client); 432 if (pwd_data) 433 krb5_free_data(context, pwd_data); 434 if (kadm5_handle) 435 kadm5_destroy (kadm5_handle); 436 } 437 438 static int 439 verify (krb5_auth_context *auth_context, 440 krb5_realm *realms, 441 krb5_keytab keytab, 442 krb5_ticket **ticket, 443 krb5_data *out_data, 444 uint16_t *version, 445 int s, 446 struct sockaddr *sa, 447 int sa_size, 448 u_char *msg, 449 size_t len, 450 krb5_address *client_addr) 451 { 452 krb5_error_code ret; 453 uint16_t pkt_len, pkt_ver, ap_req_len; 454 krb5_data ap_req_data; 455 krb5_data krb_priv_data; 456 krb5_realm *r; 457 458 /* 459 * Only send an error reply if the request passes basic length 460 * verification. Otherwise, kpasswdd would reply to every UDP packet, 461 * allowing an attacker to set up a ping-pong DoS attack via a spoofed UDP 462 * packet with a source address of another UDP service that also replies 463 * to every packet. 464 * 465 * Also suppress the error reply if ap_req_len is 0, which indicates 466 * either an invalid request or an error packet. An error packet may be 467 * the result of a ping-pong attacker pointing us at another kpasswdd. 468 */ 469 pkt_len = (msg[0] << 8) | (msg[1]); 470 pkt_ver = (msg[2] << 8) | (msg[3]); 471 ap_req_len = (msg[4] << 8) | (msg[5]); 472 if (pkt_len != len) { 473 krb5_warnx (context, "Strange len: %ld != %ld", 474 (long)pkt_len, (long)len); 475 return 1; 476 } 477 if (ap_req_len == 0) { 478 krb5_warnx (context, "Request is error packet (ap_req_len == 0)"); 479 return 1; 480 } 481 if (pkt_ver != KRB5_KPASSWD_VERS_CHANGEPW && 482 pkt_ver != KRB5_KPASSWD_VERS_SETPW) { 483 krb5_warnx (context, "Bad version (%d)", pkt_ver); 484 reply_error (NULL, s, sa, sa_size, 0, 1, "Wrong program version"); 485 return 1; 486 } 487 *version = pkt_ver; 488 489 ap_req_data.data = msg + 6; 490 ap_req_data.length = ap_req_len; 491 492 ret = krb5_rd_req (context, 493 auth_context, 494 &ap_req_data, 495 NULL, 496 keytab, 497 NULL, 498 ticket); 499 if (ret) { 500 krb5_warn (context, ret, "krb5_rd_req"); 501 reply_error (NULL, s, sa, sa_size, ret, 3, "Authentication failed"); 502 return 1; 503 } 504 505 /* verify realm and principal */ 506 for (r = realms; *r != NULL; r++) { 507 krb5_principal principal; 508 krb5_boolean same; 509 510 ret = krb5_make_principal (context, 511 &principal, 512 *r, 513 "kadmin", 514 "changepw", 515 NULL); 516 if (ret) 517 krb5_err (context, 1, ret, "krb5_make_principal"); 518 519 same = krb5_principal_compare(context, principal, (*ticket)->server); 520 krb5_free_principal(context, principal); 521 if (same == TRUE) 522 break; 523 } 524 if (*r == NULL) { 525 char *str; 526 krb5_unparse_name(context, (*ticket)->server, &str); 527 krb5_warnx (context, "client used not valid principal %s", str); 528 free(str); 529 reply_error (NULL, s, sa, sa_size, ret, 1, 530 "Bad request"); 531 goto out; 532 } 533 534 if (strcmp((*ticket)->server->realm, (*ticket)->client->realm) != 0) { 535 krb5_warnx (context, "server realm (%s) not same a client realm (%s)", 536 (*ticket)->server->realm, (*ticket)->client->realm); 537 reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 1, 538 "Bad request"); 539 goto out; 540 } 541 542 if (!(*ticket)->ticket.flags.initial) { 543 krb5_warnx (context, "initial flag not set"); 544 reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 1, 545 "Bad request"); 546 goto out; 547 } 548 krb_priv_data.data = msg + 6 + ap_req_len; 549 krb_priv_data.length = len - 6 - ap_req_len; 550 551 /* 552 * Only enforce client addresses on on tickets with addresses. If 553 * its addressless, we are guessing its behind NAT and really 554 * can't know this information. 555 */ 556 557 if ((*ticket)->ticket.caddr && (*ticket)->ticket.caddr->len > 0) { 558 ret = krb5_auth_con_setaddrs (context, *auth_context, 559 NULL, client_addr); 560 if (ret) { 561 krb5_warn (context, ret, "krb5_auth_con_setaddr(this)"); 562 goto out; 563 } 564 } 565 566 ret = krb5_rd_priv (context, 567 *auth_context, 568 &krb_priv_data, 569 out_data, 570 NULL); 571 572 if (ret) { 573 krb5_warn (context, ret, "krb5_rd_priv"); 574 reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 3, 575 "Bad request"); 576 goto out; 577 } 578 return 0; 579 out: 580 krb5_free_ticket (context, *ticket); 581 ticket = NULL; 582 return 1; 583 } 584 585 static void 586 process (krb5_realm *realms, 587 krb5_keytab keytab, 588 int s, 589 krb5_address *this_addr, 590 struct sockaddr *sa, 591 int sa_size, 592 u_char *msg, 593 int len) 594 { 595 krb5_error_code ret; 596 krb5_auth_context auth_context = NULL; 597 krb5_data out_data; 598 krb5_ticket *ticket; 599 krb5_address other_addr; 600 uint16_t version; 601 602 memset(&other_addr, 0, sizeof(other_addr)); 603 krb5_data_zero (&out_data); 604 605 ret = krb5_auth_con_init (context, &auth_context); 606 if (ret) { 607 krb5_warn (context, ret, "krb5_auth_con_init"); 608 return; 609 } 610 611 krb5_auth_con_setflags (context, auth_context, 612 KRB5_AUTH_CONTEXT_DO_SEQUENCE); 613 614 ret = krb5_sockaddr2address (context, sa, &other_addr); 615 if (ret) { 616 krb5_warn (context, ret, "krb5_sockaddr2address"); 617 goto out; 618 } 619 620 ret = krb5_auth_con_setaddrs (context, auth_context, this_addr, NULL); 621 if (ret) { 622 krb5_warn (context, ret, "krb5_auth_con_setaddr(this)"); 623 goto out; 624 } 625 626 if (verify (&auth_context, realms, keytab, &ticket, &out_data, 627 &version, s, sa, sa_size, msg, len, &other_addr) == 0) 628 { 629 /* 630 * We always set the client_addr, to assume that the client 631 * can ignore it if it choose to do so (just the server does 632 * so for addressless tickets). 633 */ 634 ret = krb5_auth_con_setaddrs (context, auth_context, 635 this_addr, &other_addr); 636 if (ret) { 637 krb5_warn (context, ret, "krb5_auth_con_setaddr(other)"); 638 goto out; 639 } 640 641 change (auth_context, 642 ticket->client, 643 version, 644 s, 645 sa, sa_size, 646 &out_data); 647 memset (out_data.data, 0, out_data.length); 648 krb5_free_ticket (context, ticket); 649 } 650 651 out: 652 krb5_free_address(context, &other_addr); 653 krb5_data_free(&out_data); 654 krb5_auth_con_free(context, auth_context); 655 } 656 657 #ifdef INETD_SUPPORT 658 /* 659 * XXX this code relies on getsockname() returning a valid local 660 * address for a "connected" DGRAM socket. This is true for most, but 661 * probably not all systems. For some systems, this could be done 662 * cleaner by using the IP_RECVDSTADDR option + recvmsg(). 663 */ 664 static int 665 get_local_addr(struct sockaddr *remote, int remlen, 666 struct sockaddr *local, socklen_t *loclen) 667 { 668 int s, ret; 669 670 s = socket(remote->sa_family, SOCK_DGRAM, 0); 671 if (s < 0) 672 return -1; 673 674 if (connect(s, remote, remlen) < 0) { 675 close(s); 676 return -1; 677 } 678 679 ret = getsockname(s, local, loclen); 680 close(s); 681 return ret; 682 } 683 #endif 684 685 static int 686 doit (krb5_keytab keytab, int port) 687 { 688 krb5_error_code ret; 689 int *sockets; 690 int maxfd; 691 krb5_realm *realms; 692 krb5_addresses addrs; 693 krb5_address *my_addrp; 694 unsigned n, i; 695 fd_set real_fdset; 696 struct sockaddr_storage __ss; 697 struct sockaddr *sa = (struct sockaddr *)&__ss; 698 #ifdef INETD_SUPPORT 699 int fdz; 700 int from_inetd; 701 socklen_t fromlen; 702 krb5_address my_addr; 703 struct sockaddr_storage __local; 704 struct sockaddr *localsa = (struct sockaddr *)&__local; 705 #endif 706 707 ret = krb5_get_default_realms(context, &realms); 708 if (ret) 709 krb5_err (context, 1, ret, "krb5_get_default_realms"); 710 711 #ifdef INETD_SUPPORT 712 fromlen = sizeof __ss; 713 from_inetd = (getsockname(0, sa, &fromlen) == 0); 714 715 if (!from_inetd) { 716 #endif 717 if (explicit_addresses.len) { 718 addrs = explicit_addresses; 719 } else { 720 ret = krb5_get_all_server_addrs (context, &addrs); 721 if (ret) 722 krb5_err (context, 1, ret, "krb5_get_all_server_addrs"); 723 } 724 n = addrs.len; 725 726 sockets = malloc (n * sizeof(*sockets)); 727 if (sockets == NULL) 728 krb5_errx (context, 1, "out of memory"); 729 maxfd = -1; 730 FD_ZERO(&real_fdset); 731 for (i = 0; i < n; ++i) { 732 krb5_socklen_t sa_size = sizeof(__ss); 733 734 krb5_addr2sockaddr (context, &addrs.val[i], sa, &sa_size, port); 735 736 sockets[i] = socket (sa->sa_family, SOCK_DGRAM, 0); 737 if (sockets[i] < 0) 738 krb5_err (context, 1, errno, "socket"); 739 if (bind (sockets[i], sa, sa_size) < 0) { 740 char str[128]; 741 size_t len; 742 int save_errno = errno; 743 744 ret = krb5_print_address (&addrs.val[i], str, sizeof(str), &len); 745 if (ret) 746 strlcpy(str, "unknown address", sizeof(str)); 747 krb5_warn (context, save_errno, "bind(%s)", str); 748 continue; 749 } 750 maxfd = max (maxfd, sockets[i]); 751 if (maxfd >= FD_SETSIZE) 752 krb5_errx (context, 1, "fd too large"); 753 FD_SET(sockets[i], &real_fdset); 754 } 755 #ifdef INETD_SUPPORT 756 } else { 757 n = 1; 758 maxfd = 0; 759 fdz = 0; 760 sockets = &fdz; 761 FD_ZERO(&real_fdset); 762 FD_SET(0, &real_fdset); 763 } 764 #endif 765 if (maxfd == -1) 766 krb5_errx (context, 1, "No sockets!"); 767 768 while(exit_flag == 0) { 769 krb5_ssize_t retx; 770 fd_set fdset = real_fdset; 771 772 retx = select (maxfd + 1, &fdset, NULL, NULL, NULL); 773 if (retx < 0) { 774 if (errno == EINTR) 775 continue; 776 else 777 krb5_err (context, 1, errno, "select"); 778 } 779 for (i = 0; i < n; ++i) 780 if (FD_ISSET(sockets[i], &fdset)) { 781 u_char buf[BUFSIZ]; 782 socklen_t addrlen = sizeof(__ss); 783 784 retx = recvfrom(sockets[i], buf, sizeof(buf), 0, 785 sa, &addrlen); 786 if (retx < 0) { 787 if(errno == EINTR) 788 break; 789 else 790 krb5_err (context, 1, errno, "recvfrom"); 791 } 792 #ifdef INETD_SUPPORT 793 if (from_inetd) { 794 socklen_t loclen = sizeof(__local); 795 int ret2; 796 797 ret2 = get_local_addr(sa, addrlen, localsa, &loclen); 798 if (ret2 < 0) 799 krb5_errx (context, errno, "get_local_addr"); 800 ret2 = krb5_sockaddr2address(context, localsa, 801 &my_addr); 802 if (ret2) 803 krb5_errx (context, ret2, 804 "krb5_sockaddr2address"); 805 my_addrp = &my_addr; 806 } else 807 #endif 808 my_addrp = &addrs.val[i]; 809 810 process (realms, keytab, sockets[i], 811 my_addrp, 812 sa, addrlen, 813 buf, retx); 814 #ifdef INETD_SUPPORT 815 if (from_inetd) { 816 krb5_free_address(context, &my_addr); 817 } 818 #endif 819 } 820 #ifdef INETD_SUPPORT 821 if (from_inetd) 822 break; 823 #endif 824 } 825 826 for (i = 0; i < n; ++i) 827 close(sockets[i]); 828 free(sockets); 829 830 #ifdef INETD_SUPPORT 831 if (!from_inetd) 832 #endif 833 krb5_free_addresses (context, &addrs); 834 krb5_free_host_realm (context, realms); 835 krb5_free_context (context); 836 return 0; 837 } 838 839 static RETSIGTYPE 840 sigterm(int sig) 841 { 842 exit_flag = 1; 843 } 844 845 static const char *check_library = NULL; 846 static const char *check_function = NULL; 847 static getarg_strings policy_libraries = { 0, NULL }; 848 static char sHDB[] = "HDB:"; 849 static char *keytab_str = sHDB; 850 static char *realm_str; 851 static int version_flag; 852 static int help_flag; 853 static char *port_str; 854 static char *config_file; 855 856 struct getargs args[] = { 857 #ifdef HAVE_DLOPEN 858 { "check-library", 0, arg_string, &check_library, 859 "library to load password check function from", "library" }, 860 { "check-function", 0, arg_string, &check_function, 861 "password check function to load", "function" }, 862 { "policy-libraries", 0, arg_strings, &policy_libraries, 863 "password check function to load", "function" }, 864 #endif 865 { "addresses", 0, arg_strings, &addresses_str, 866 "addresses to listen on", "list of addresses" }, 867 { "keytab", 'k', arg_string, &keytab_str, 868 "keytab to get authentication key from", "kspec" }, 869 { "config-file", 'c', arg_string, &config_file, NULL, NULL }, 870 { "realm", 'r', arg_string, &realm_str, "default realm", "realm" }, 871 { "port", 'p', arg_string, &port_str, "port", NULL }, 872 { "version", 0, arg_flag, &version_flag, NULL, NULL }, 873 { "help", 0, arg_flag, &help_flag, NULL, NULL } 874 }; 875 int num_args = sizeof(args) / sizeof(args[0]); 876 877 int 878 main (int argc, char **argv) 879 { 880 krb5_keytab keytab; 881 krb5_error_code ret; 882 char **files; 883 int port, i; 884 885 krb5_program_setup(&context, argc, argv, args, num_args, NULL); 886 887 if(help_flag) 888 krb5_std_usage(0, args, num_args); 889 if(version_flag) { 890 print_version(NULL); 891 exit(0); 892 } 893 894 if (config_file == NULL) { 895 asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context)); 896 if (config_file == NULL) 897 errx(1, "out of memory"); 898 } 899 900 ret = krb5_prepend_config_files_default(config_file, &files); 901 if (ret) 902 krb5_err(context, 1, ret, "getting configuration files"); 903 904 ret = krb5_set_config_files(context, files); 905 krb5_free_config_files(files); 906 if (ret) 907 krb5_err(context, 1, ret, "reading configuration files"); 908 909 if(realm_str) 910 krb5_set_default_realm(context, realm_str); 911 912 krb5_openlog (context, "kpasswdd", &log_facility); 913 krb5_set_warn_dest(context, log_facility); 914 915 if (port_str != NULL) { 916 struct servent *s = roken_getservbyname (port_str, "udp"); 917 918 if (s != NULL) 919 port = s->s_port; 920 else { 921 char *ptr; 922 923 port = strtol (port_str, &ptr, 10); 924 if (port == 0 && ptr == port_str) 925 krb5_errx (context, 1, "bad port `%s'", port_str); 926 port = htons(port); 927 } 928 } else 929 port = krb5_getportbyname (context, "kpasswd", "udp", KPASSWD_PORT); 930 931 ret = krb5_kt_register(context, &hdb_kt_ops); 932 if(ret) 933 krb5_err(context, 1, ret, "krb5_kt_register"); 934 935 ret = krb5_kt_resolve(context, keytab_str, &keytab); 936 if(ret) 937 krb5_err(context, 1, ret, "%s", keytab_str); 938 939 kadm5_setup_passwd_quality_check (context, check_library, check_function); 940 941 for (i = 0; i < policy_libraries.num_strings; i++) { 942 ret = kadm5_add_passwd_quality_verifier(context, 943 policy_libraries.strings[i]); 944 if (ret) 945 krb5_err(context, 1, ret, "kadm5_add_passwd_quality_verifier"); 946 } 947 ret = kadm5_add_passwd_quality_verifier(context, NULL); 948 if (ret) 949 krb5_err(context, 1, ret, "kadm5_add_passwd_quality_verifier"); 950 951 952 explicit_addresses.len = 0; 953 954 if (addresses_str.num_strings) { 955 int j; 956 957 for (j = 0; j < addresses_str.num_strings; ++j) 958 add_one_address (addresses_str.strings[j], j == 0); 959 free_getarg_strings (&addresses_str); 960 } else { 961 char **foo = krb5_config_get_strings (context, NULL, 962 "kdc", "addresses", NULL); 963 964 if (foo != NULL) { 965 add_one_address (*foo++, TRUE); 966 while (*foo) 967 add_one_address (*foo++, FALSE); 968 } 969 } 970 971 #ifdef HAVE_SIGACTION 972 { 973 struct sigaction sa; 974 975 sa.sa_flags = 0; 976 sa.sa_handler = sigterm; 977 sigemptyset(&sa.sa_mask); 978 979 sigaction(SIGINT, &sa, NULL); 980 sigaction(SIGTERM, &sa, NULL); 981 } 982 #else 983 signal(SIGINT, sigterm); 984 signal(SIGTERM, sigterm); 985 #endif 986 987 pidfile(NULL); 988 989 return doit (keytab, port); 990 } 991