1 /* 2 * Copyright (c) 1997-2005 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 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 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "kpasswd_locl.h" 35 RCSID("$Id$"); 36 37 #include <kadm5/admin.h> 38 #ifdef HAVE_SYS_UN_H 39 #include <sys/un.h> 40 #endif 41 #include <hdb.h> 42 #include <kadm5/private.h> 43 44 static krb5_context context; 45 static krb5_log_facility *log_facility; 46 47 static struct getarg_strings addresses_str; 48 krb5_addresses explicit_addresses; 49 50 static sig_atomic_t exit_flag = 0; 51 52 static void 53 add_one_address (const char *str, int first) 54 { 55 krb5_error_code ret; 56 krb5_addresses tmp; 57 58 ret = krb5_parse_address (context, str, &tmp); 59 if (ret) 60 krb5_err (context, 1, ret, "parse_address `%s'", str); 61 if (first) 62 krb5_copy_addresses(context, &tmp, &explicit_addresses); 63 else 64 krb5_append_addresses(context, &explicit_addresses, &tmp); 65 krb5_free_addresses (context, &tmp); 66 } 67 68 static void 69 send_reply (int s, 70 struct sockaddr *sa, 71 int sa_size, 72 krb5_data *ap_rep, 73 krb5_data *rest) 74 { 75 struct msghdr msghdr; 76 struct iovec iov[3]; 77 uint16_t len, ap_rep_len; 78 u_char header[6]; 79 u_char *p; 80 81 if (ap_rep) 82 ap_rep_len = ap_rep->length; 83 else 84 ap_rep_len = 0; 85 86 len = 6 + ap_rep_len + rest->length; 87 p = header; 88 *p++ = (len >> 8) & 0xFF; 89 *p++ = (len >> 0) & 0xFF; 90 *p++ = 0; 91 *p++ = 1; 92 *p++ = (ap_rep_len >> 8) & 0xFF; 93 *p++ = (ap_rep_len >> 0) & 0xFF; 94 95 memset (&msghdr, 0, sizeof(msghdr)); 96 msghdr.msg_name = (void *)sa; 97 msghdr.msg_namelen = sa_size; 98 msghdr.msg_iov = iov; 99 msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov); 100 #if 0 101 msghdr.msg_control = NULL; 102 msghdr.msg_controllen = 0; 103 #endif 104 105 iov[0].iov_base = (char *)header; 106 iov[0].iov_len = 6; 107 if (ap_rep_len) { 108 iov[1].iov_base = ap_rep->data; 109 iov[1].iov_len = ap_rep->length; 110 } else { 111 iov[1].iov_base = NULL; 112 iov[1].iov_len = 0; 113 } 114 iov[2].iov_base = rest->data; 115 iov[2].iov_len = rest->length; 116 117 if (sendmsg (s, &msghdr, 0) < 0) 118 krb5_warn (context, errno, "sendmsg"); 119 } 120 121 static int 122 make_result (krb5_data *data, 123 uint16_t result_code, 124 const char *expl) 125 { 126 char *str; 127 krb5_data_zero (data); 128 129 data->length = asprintf (&str, 130 "%c%c%s", 131 (result_code >> 8) & 0xFF, 132 result_code & 0xFF, 133 expl); 134 135 if (str == NULL) { 136 krb5_warnx (context, "Out of memory generating error reply"); 137 return 1; 138 } 139 data->data = str; 140 return 0; 141 } 142 143 static void 144 reply_error (krb5_realm realm, 145 int s, 146 struct sockaddr *sa, 147 int sa_size, 148 krb5_error_code error_code, 149 uint16_t result_code, 150 const char *expl) 151 { 152 krb5_error_code ret; 153 krb5_data error_data; 154 krb5_data e_data; 155 krb5_principal server = NULL; 156 157 if (make_result(&e_data, result_code, expl)) 158 return; 159 160 if (realm) { 161 ret = krb5_make_principal (context, &server, realm, 162 "kadmin", "changepw", NULL); 163 if (ret) { 164 krb5_data_free (&e_data); 165 return; 166 } 167 } 168 169 ret = krb5_mk_error (context, 170 error_code, 171 NULL, 172 &e_data, 173 NULL, 174 server, 175 NULL, 176 NULL, 177 &error_data); 178 if (server) 179 krb5_free_principal(context, server); 180 krb5_data_free (&e_data); 181 if (ret) { 182 krb5_warn (context, ret, "Could not even generate error reply"); 183 return; 184 } 185 send_reply (s, sa, sa_size, NULL, &error_data); 186 krb5_data_free (&error_data); 187 } 188 189 static void 190 reply_priv (krb5_auth_context auth_context, 191 int s, 192 struct sockaddr *sa, 193 int sa_size, 194 uint16_t result_code, 195 const char *expl) 196 { 197 krb5_error_code ret; 198 krb5_data krb_priv_data; 199 krb5_data ap_rep_data; 200 krb5_data e_data; 201 202 ret = krb5_mk_rep (context, 203 auth_context, 204 &ap_rep_data); 205 if (ret) { 206 krb5_warn (context, ret, "Could not even generate error reply"); 207 return; 208 } 209 210 if (make_result(&e_data, result_code, expl)) 211 return; 212 213 ret = krb5_mk_priv (context, 214 auth_context, 215 &e_data, 216 &krb_priv_data, 217 NULL); 218 krb5_data_free (&e_data); 219 if (ret) { 220 krb5_warn (context, ret, "Could not even generate error reply"); 221 return; 222 } 223 send_reply (s, sa, sa_size, &ap_rep_data, &krb_priv_data); 224 krb5_data_free (&ap_rep_data); 225 krb5_data_free (&krb_priv_data); 226 } 227 228 /* 229 * Change the password for `principal', sending the reply back on `s' 230 * (`sa', `sa_size') to `pwd_data'. 231 */ 232 233 static void 234 change (krb5_auth_context auth_context, 235 krb5_principal admin_principal, 236 uint16_t version, 237 int s, 238 struct sockaddr *sa, 239 int sa_size, 240 krb5_data *in_data) 241 { 242 krb5_error_code ret; 243 char *client = NULL, *admin = NULL; 244 const char *pwd_reason; 245 kadm5_config_params conf; 246 void *kadm5_handle = NULL; 247 krb5_principal principal = NULL; 248 krb5_data *pwd_data = NULL; 249 char *tmp; 250 ChangePasswdDataMS chpw; 251 252 memset (&conf, 0, sizeof(conf)); 253 memset(&chpw, 0, sizeof(chpw)); 254 255 if (version == KRB5_KPASSWD_VERS_CHANGEPW) { 256 ret = krb5_copy_data(context, in_data, &pwd_data); 257 if (ret) { 258 krb5_warn (context, ret, "krb5_copy_data"); 259 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_MALFORMED, 260 "out out memory copying password"); 261 return; 262 } 263 principal = admin_principal; 264 } else if (version == KRB5_KPASSWD_VERS_SETPW) { 265 size_t len; 266 267 ret = decode_ChangePasswdDataMS(in_data->data, in_data->length, 268 &chpw, &len); 269 if (ret) { 270 krb5_warn (context, ret, "decode_ChangePasswdDataMS"); 271 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_MALFORMED, 272 "malformed ChangePasswdData"); 273 return; 274 } 275 276 277 ret = krb5_copy_data(context, &chpw.newpasswd, &pwd_data); 278 if (ret) { 279 krb5_warn (context, ret, "krb5_copy_data"); 280 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_MALFORMED, 281 "out out memory copying password"); 282 goto out; 283 } 284 285 if (chpw.targname == NULL && chpw.targrealm != NULL) { 286 krb5_warn (context, ret, "kadm5_init_with_password_ctx"); 287 reply_priv (auth_context, s, sa, sa_size, 288 KRB5_KPASSWD_MALFORMED, 289 "targrealm but not targname"); 290 goto out; 291 } 292 293 if (chpw.targname) { 294 krb5_principal_data princ; 295 296 princ.name = *chpw.targname; 297 princ.realm = *chpw.targrealm; 298 if (princ.realm == NULL) { 299 ret = krb5_get_default_realm(context, &princ.realm); 300 301 if (ret) { 302 krb5_warnx (context, 303 "kadm5_init_with_password_ctx: " 304 "failed to allocate realm"); 305 reply_priv (auth_context, s, sa, sa_size, 306 KRB5_KPASSWD_SOFTERROR, 307 "failed to allocate realm"); 308 goto out; 309 } 310 } 311 ret = krb5_copy_principal(context, &princ, &principal); 312 if (*chpw.targrealm == NULL) 313 free(princ.realm); 314 if (ret) { 315 krb5_warn(context, ret, "krb5_copy_principal"); 316 reply_priv(auth_context, s, sa, sa_size, 317 KRB5_KPASSWD_HARDERROR, 318 "failed to allocate principal"); 319 goto out; 320 } 321 } else 322 principal = admin_principal; 323 } else { 324 krb5_warnx (context, "kadm5_init_with_password_ctx: unknown proto"); 325 reply_priv (auth_context, s, sa, sa_size, 326 KRB5_KPASSWD_HARDERROR, 327 "Unknown protocol used"); 328 return; 329 } 330 331 ret = krb5_unparse_name (context, admin_principal, &admin); 332 if (ret) { 333 krb5_warn (context, ret, "unparse_name failed"); 334 reply_priv (auth_context, s, sa, sa_size, 335 KRB5_KPASSWD_HARDERROR, "out of memory error"); 336 goto out; 337 } 338 339 conf.realm = principal->realm; 340 conf.mask |= KADM5_CONFIG_REALM; 341 342 ret = kadm5_init_with_password_ctx(context, 343 admin, 344 NULL, 345 KADM5_ADMIN_SERVICE, 346 &conf, 0, 0, 347 &kadm5_handle); 348 if (ret) { 349 krb5_warn (context, ret, "kadm5_init_with_password_ctx"); 350 reply_priv (auth_context, s, sa, sa_size, 2, 351 "Internal error"); 352 goto out; 353 } 354 355 ret = krb5_unparse_name(context, principal, &client); 356 if (ret) { 357 krb5_warn (context, ret, "unparse_name failed"); 358 reply_priv (auth_context, s, sa, sa_size, 359 KRB5_KPASSWD_HARDERROR, "out of memory error"); 360 goto out; 361 } 362 363 /* 364 * Check password quality if not changing as administrator 365 */ 366 367 if (krb5_principal_compare(context, admin_principal, principal) == TRUE) { 368 369 pwd_reason = kadm5_check_password_quality (context, principal, 370 pwd_data); 371 if (pwd_reason != NULL ) { 372 krb5_warnx (context, 373 "%s didn't pass password quality check with error: %s", 374 client, pwd_reason); 375 reply_priv (auth_context, s, sa, sa_size, 376 KRB5_KPASSWD_SOFTERROR, pwd_reason); 377 goto out; 378 } 379 krb5_warnx (context, "Changing password for %s", client); 380 } else { 381 ret = _kadm5_acl_check_permission(kadm5_handle, KADM5_PRIV_CPW, 382 principal); 383 if (ret) { 384 krb5_warn (context, ret, 385 "Check ACL failed for %s for changing %s password", 386 admin, client); 387 reply_priv (auth_context, s, sa, sa_size, 388 KRB5_KPASSWD_HARDERROR, "permission denied"); 389 goto out; 390 } 391 krb5_warnx (context, "%s is changing password for %s", admin, client); 392 } 393 394 ret = krb5_data_realloc(pwd_data, pwd_data->length + 1); 395 if (ret) { 396 krb5_warn (context, ret, "malloc: out of memory"); 397 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_HARDERROR, 398 "Internal error"); 399 goto out; 400 } 401 tmp = pwd_data->data; 402 tmp[pwd_data->length - 1] = '\0'; 403 404 ret = kadm5_s_chpass_principal_cond (kadm5_handle, principal, tmp); 405 krb5_free_data (context, pwd_data); 406 pwd_data = NULL; 407 if (ret) { 408 const char *str = krb5_get_error_message(context, ret); 409 krb5_warnx(context, "kadm5_s_chpass_principal_cond: %s", str); 410 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_SOFTERROR, 411 str ? str : "Internal error"); 412 krb5_free_error_message(context, str); 413 goto out; 414 } 415 reply_priv (auth_context, s, sa, sa_size, KRB5_KPASSWD_SUCCESS, 416 "Password changed"); 417 out: 418 free_ChangePasswdDataMS(&chpw); 419 if (principal != admin_principal) 420 krb5_free_principal(context, principal); 421 if (admin) 422 free(admin); 423 if (client) 424 free(client); 425 if (pwd_data) 426 krb5_free_data(context, pwd_data); 427 if (kadm5_handle) 428 kadm5_destroy (kadm5_handle); 429 } 430 431 static int 432 verify (krb5_auth_context *auth_context, 433 krb5_realm *realms, 434 krb5_keytab keytab, 435 krb5_ticket **ticket, 436 krb5_data *out_data, 437 uint16_t *version, 438 int s, 439 struct sockaddr *sa, 440 int sa_size, 441 u_char *msg, 442 size_t len) 443 { 444 krb5_error_code ret; 445 uint16_t pkt_len, pkt_ver, ap_req_len; 446 krb5_data ap_req_data; 447 krb5_data krb_priv_data; 448 krb5_realm *r; 449 450 /* 451 * Only send an error reply if the request passes basic length 452 * verification. Otherwise, kpasswdd would reply to every UDP packet, 453 * allowing an attacker to set up a ping-pong DoS attack via a spoofed UDP 454 * packet with a source address of another UDP service that also replies 455 * to every packet. 456 * 457 * Also suppress the error reply if ap_req_len is 0, which indicates 458 * either an invalid request or an error packet. An error packet may be 459 * the result of a ping-pong attacker pointing us at another kpasswdd. 460 */ 461 pkt_len = (msg[0] << 8) | (msg[1]); 462 pkt_ver = (msg[2] << 8) | (msg[3]); 463 ap_req_len = (msg[4] << 8) | (msg[5]); 464 if (pkt_len != len) { 465 krb5_warnx (context, "Strange len: %ld != %ld", 466 (long)pkt_len, (long)len); 467 return 1; 468 } 469 if (ap_req_len == 0) { 470 krb5_warnx (context, "Request is error packet (ap_req_len == 0)"); 471 return 1; 472 } 473 if (pkt_ver != KRB5_KPASSWD_VERS_CHANGEPW && 474 pkt_ver != KRB5_KPASSWD_VERS_SETPW) { 475 krb5_warnx (context, "Bad version (%d)", pkt_ver); 476 reply_error (NULL, s, sa, sa_size, 0, 1, "Wrong program version"); 477 return 1; 478 } 479 *version = pkt_ver; 480 481 ap_req_data.data = msg + 6; 482 ap_req_data.length = ap_req_len; 483 484 ret = krb5_rd_req (context, 485 auth_context, 486 &ap_req_data, 487 NULL, 488 keytab, 489 NULL, 490 ticket); 491 if (ret) { 492 krb5_warn (context, ret, "krb5_rd_req"); 493 reply_error (NULL, s, sa, sa_size, ret, 3, "Authentication failed"); 494 return 1; 495 } 496 497 /* verify realm and principal */ 498 for (r = realms; *r != NULL; r++) { 499 krb5_principal principal; 500 krb5_boolean same; 501 502 ret = krb5_make_principal (context, 503 &principal, 504 *r, 505 "kadmin", 506 "changepw", 507 NULL); 508 if (ret) 509 krb5_err (context, 1, ret, "krb5_make_principal"); 510 511 same = krb5_principal_compare(context, principal, (*ticket)->server); 512 krb5_free_principal(context, principal); 513 if (same == TRUE) 514 break; 515 } 516 if (*r == NULL) { 517 char *str; 518 krb5_unparse_name(context, (*ticket)->server, &str); 519 krb5_warnx (context, "client used not valid principal %s", str); 520 free(str); 521 reply_error (NULL, s, sa, sa_size, ret, 1, 522 "Bad request"); 523 goto out; 524 } 525 526 if (strcmp((*ticket)->server->realm, (*ticket)->client->realm) != 0) { 527 krb5_warnx (context, "server realm (%s) not same a client realm (%s)", 528 (*ticket)->server->realm, (*ticket)->client->realm); 529 reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 1, 530 "Bad request"); 531 goto out; 532 } 533 534 if (!(*ticket)->ticket.flags.initial) { 535 krb5_warnx (context, "initial flag not set"); 536 reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 1, 537 "Bad request"); 538 goto out; 539 } 540 krb_priv_data.data = msg + 6 + ap_req_len; 541 krb_priv_data.length = len - 6 - ap_req_len; 542 543 ret = krb5_rd_priv (context, 544 *auth_context, 545 &krb_priv_data, 546 out_data, 547 NULL); 548 549 if (ret) { 550 krb5_warn (context, ret, "krb5_rd_priv"); 551 reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 3, 552 "Bad request"); 553 goto out; 554 } 555 return 0; 556 out: 557 krb5_free_ticket (context, *ticket); 558 ticket = NULL; 559 return 1; 560 } 561 562 static void 563 process (krb5_realm *realms, 564 krb5_keytab keytab, 565 int s, 566 krb5_address *this_addr, 567 struct sockaddr *sa, 568 int sa_size, 569 u_char *msg, 570 int len) 571 { 572 krb5_error_code ret; 573 krb5_auth_context auth_context = NULL; 574 krb5_data out_data; 575 krb5_ticket *ticket; 576 krb5_address other_addr; 577 uint16_t version; 578 579 580 krb5_data_zero (&out_data); 581 582 ret = krb5_auth_con_init (context, &auth_context); 583 if (ret) { 584 krb5_warn (context, ret, "krb5_auth_con_init"); 585 return; 586 } 587 588 krb5_auth_con_setflags (context, auth_context, 589 KRB5_AUTH_CONTEXT_DO_SEQUENCE); 590 591 ret = krb5_sockaddr2address (context, sa, &other_addr); 592 if (ret) { 593 krb5_warn (context, ret, "krb5_sockaddr2address"); 594 goto out; 595 } 596 597 ret = krb5_auth_con_setaddrs (context, 598 auth_context, 599 this_addr, 600 &other_addr); 601 krb5_free_address (context, &other_addr); 602 if (ret) { 603 krb5_warn (context, ret, "krb5_auth_con_setaddr"); 604 goto out; 605 } 606 607 if (verify (&auth_context, realms, keytab, &ticket, &out_data, 608 &version, s, sa, sa_size, msg, len) == 0) { 609 change (auth_context, 610 ticket->client, 611 version, 612 s, 613 sa, sa_size, 614 &out_data); 615 memset (out_data.data, 0, out_data.length); 616 krb5_free_ticket (context, ticket); 617 } 618 619 out: 620 krb5_data_free (&out_data); 621 krb5_auth_con_free (context, auth_context); 622 } 623 624 static int 625 doit (krb5_keytab keytab, int port) 626 { 627 krb5_error_code ret; 628 int *sockets; 629 int maxfd; 630 krb5_realm *realms; 631 krb5_addresses addrs; 632 unsigned n, i; 633 fd_set real_fdset; 634 struct sockaddr_storage __ss; 635 struct sockaddr *sa = (struct sockaddr *)&__ss; 636 637 ret = krb5_get_default_realms(context, &realms); 638 if (ret) 639 krb5_err (context, 1, ret, "krb5_get_default_realms"); 640 641 if (explicit_addresses.len) { 642 addrs = explicit_addresses; 643 } else { 644 ret = krb5_get_all_server_addrs (context, &addrs); 645 if (ret) 646 krb5_err (context, 1, ret, "krb5_get_all_server_addrs"); 647 } 648 n = addrs.len; 649 650 sockets = malloc (n * sizeof(*sockets)); 651 if (sockets == NULL) 652 krb5_errx (context, 1, "out of memory"); 653 maxfd = -1; 654 FD_ZERO(&real_fdset); 655 for (i = 0; i < n; ++i) { 656 krb5_socklen_t sa_size = sizeof(__ss); 657 658 krb5_addr2sockaddr (context, &addrs.val[i], sa, &sa_size, port); 659 660 sockets[i] = socket (sa->sa_family, SOCK_DGRAM, 0); 661 if (sockets[i] < 0) 662 krb5_err (context, 1, errno, "socket"); 663 if (bind (sockets[i], sa, sa_size) < 0) { 664 char str[128]; 665 size_t len; 666 int save_errno = errno; 667 668 ret = krb5_print_address (&addrs.val[i], str, sizeof(str), &len); 669 if (ret) 670 strlcpy(str, "unknown address", sizeof(str)); 671 krb5_warn (context, save_errno, "bind(%s)", str); 672 continue; 673 } 674 maxfd = max (maxfd, sockets[i]); 675 if (maxfd >= FD_SETSIZE) 676 krb5_errx (context, 1, "fd too large"); 677 FD_SET(sockets[i], &real_fdset); 678 } 679 if (maxfd == -1) 680 krb5_errx (context, 1, "No sockets!"); 681 682 while(exit_flag == 0) { 683 krb5_ssize_t retx; 684 fd_set fdset = real_fdset; 685 686 retx = select (maxfd + 1, &fdset, NULL, NULL, NULL); 687 if (retx < 0) { 688 if (errno == EINTR) 689 continue; 690 else 691 krb5_err (context, 1, errno, "select"); 692 } 693 for (i = 0; i < n; ++i) 694 if (FD_ISSET(sockets[i], &fdset)) { 695 u_char buf[BUFSIZ]; 696 socklen_t addrlen = sizeof(__ss); 697 698 retx = recvfrom(sockets[i], buf, sizeof(buf), 0, 699 sa, &addrlen); 700 if (retx < 0) { 701 if(errno == EINTR) 702 break; 703 else 704 krb5_err (context, 1, errno, "recvfrom"); 705 } 706 707 process (realms, keytab, sockets[i], 708 &addrs.val[i], 709 sa, addrlen, 710 buf, retx); 711 } 712 } 713 714 for (i = 0; i < n; ++i) 715 close(sockets[i]); 716 free(sockets); 717 718 krb5_free_addresses (context, &addrs); 719 krb5_free_host_realm (context, realms); 720 krb5_free_context (context); 721 return 0; 722 } 723 724 static RETSIGTYPE 725 sigterm(int sig) 726 { 727 exit_flag = 1; 728 } 729 730 static const char *check_library = NULL; 731 static const char *check_function = NULL; 732 static getarg_strings policy_libraries = { 0, NULL }; 733 static char sHDB[] = "HDB:"; 734 static char *keytab_str = sHDB; 735 static char *realm_str; 736 static int version_flag; 737 static int help_flag; 738 static char *port_str; 739 static char *config_file; 740 741 struct getargs args[] = { 742 #ifdef HAVE_DLOPEN 743 { "check-library", 0, arg_string, &check_library, 744 "library to load password check function from", "library" }, 745 { "check-function", 0, arg_string, &check_function, 746 "password check function to load", "function" }, 747 { "policy-libraries", 0, arg_strings, &policy_libraries, 748 "password check function to load", "function" }, 749 #endif 750 { "addresses", 0, arg_strings, &addresses_str, 751 "addresses to listen on", "list of addresses" }, 752 { "keytab", 'k', arg_string, &keytab_str, 753 "keytab to get authentication key from", "kspec" }, 754 { "config-file", 'c', arg_string, &config_file, NULL, NULL }, 755 { "realm", 'r', arg_string, &realm_str, "default realm", "realm" }, 756 { "port", 'p', arg_string, &port_str, "port", NULL }, 757 { "version", 0, arg_flag, &version_flag, NULL, NULL }, 758 { "help", 0, arg_flag, &help_flag, NULL, NULL } 759 }; 760 int num_args = sizeof(args) / sizeof(args[0]); 761 762 int 763 main (int argc, char **argv) 764 { 765 krb5_keytab keytab; 766 krb5_error_code ret; 767 char **files; 768 int port, i; 769 770 krb5_program_setup(&context, argc, argv, args, num_args, NULL); 771 772 if(help_flag) 773 krb5_std_usage(0, args, num_args); 774 if(version_flag) { 775 print_version(NULL); 776 exit(0); 777 } 778 779 if (config_file == NULL) { 780 asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context)); 781 if (config_file == NULL) 782 errx(1, "out of memory"); 783 } 784 785 ret = krb5_prepend_config_files_default(config_file, &files); 786 if (ret) 787 krb5_err(context, 1, ret, "getting configuration files"); 788 789 ret = krb5_set_config_files(context, files); 790 krb5_free_config_files(files); 791 if (ret) 792 krb5_err(context, 1, ret, "reading configuration files"); 793 794 if(realm_str) 795 krb5_set_default_realm(context, realm_str); 796 797 krb5_openlog (context, "kpasswdd", &log_facility); 798 krb5_set_warn_dest(context, log_facility); 799 800 if (port_str != NULL) { 801 struct servent *s = roken_getservbyname (port_str, "udp"); 802 803 if (s != NULL) 804 port = s->s_port; 805 else { 806 char *ptr; 807 808 port = strtol (port_str, &ptr, 10); 809 if (port == 0 && ptr == port_str) 810 krb5_errx (context, 1, "bad port `%s'", port_str); 811 port = htons(port); 812 } 813 } else 814 port = krb5_getportbyname (context, "kpasswd", "udp", KPASSWD_PORT); 815 816 ret = krb5_kt_register(context, &hdb_kt_ops); 817 if(ret) 818 krb5_err(context, 1, ret, "krb5_kt_register"); 819 820 ret = krb5_kt_resolve(context, keytab_str, &keytab); 821 if(ret) 822 krb5_err(context, 1, ret, "%s", keytab_str); 823 824 kadm5_setup_passwd_quality_check (context, check_library, check_function); 825 826 for (i = 0; i < policy_libraries.num_strings; i++) { 827 ret = kadm5_add_passwd_quality_verifier(context, 828 policy_libraries.strings[i]); 829 if (ret) 830 krb5_err(context, 1, ret, "kadm5_add_passwd_quality_verifier"); 831 } 832 ret = kadm5_add_passwd_quality_verifier(context, NULL); 833 if (ret) 834 krb5_err(context, 1, ret, "kadm5_add_passwd_quality_verifier"); 835 836 837 explicit_addresses.len = 0; 838 839 if (addresses_str.num_strings) { 840 int j; 841 842 for (j = 0; j < addresses_str.num_strings; ++j) 843 add_one_address (addresses_str.strings[j], j == 0); 844 free_getarg_strings (&addresses_str); 845 } else { 846 char **foo = krb5_config_get_strings (context, NULL, 847 "kdc", "addresses", NULL); 848 849 if (foo != NULL) { 850 add_one_address (*foo++, TRUE); 851 while (*foo) 852 add_one_address (*foo++, FALSE); 853 } 854 } 855 856 #ifdef HAVE_SIGACTION 857 { 858 struct sigaction sa; 859 860 sa.sa_flags = 0; 861 sa.sa_handler = sigterm; 862 sigemptyset(&sa.sa_mask); 863 864 sigaction(SIGINT, &sa, NULL); 865 sigaction(SIGTERM, &sa, NULL); 866 } 867 #else 868 signal(SIGINT, sigterm); 869 signal(SIGTERM, sigterm); 870 #endif 871 872 pidfile(NULL); 873 874 return doit (keytab, port); 875 } 876