kpasswd/kpasswdd.c

   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;
 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         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_string(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 (admin)
 420         free(admin);
 421     if (client)
 422         free(client);
 423     if (pwd_data)
 424         krb5_free_data(context, pwd_data);
 425     if (kadm5_handle)
 426         kadm5_destroy (kadm5_handle);
 427 }
 428
 429 static int
 430 verify (krb5_auth_context *auth_context,
 431         krb5_realm *realms,
 432         krb5_keytab keytab,
 433         krb5_ticket **ticket,
 434         krb5_data *out_data,
 435         uint16_t *version,
 436         int s,
 437         struct sockaddr *sa,
 438         int sa_size,
 439         u_char *msg,
 440         size_t len)
 441 {
 442     krb5_error_code ret;
 443     uint16_t pkt_len, pkt_ver, ap_req_len;
 444     krb5_data ap_req_data;
 445     krb5_data krb_priv_data;
 446     krb5_realm *r;
 447
 448     pkt_len = (msg[0] << 8) | (msg[1]);
 449     pkt_ver = (msg[2] << 8) | (msg[3]);
 450     ap_req_len = (msg[4] << 8) | (msg[5]);
 451     if (pkt_len != len) {
 452         krb5_warnx (context, "Strange len: %ld != %ld",
 453                     (long)pkt_len, (long)len);
 454         reply_error (NULL, s, sa, sa_size, 0, 1, "Bad request");
 455         return 1;
 456     }
 457     if (pkt_ver != KRB5_KPASSWD_VERS_CHANGEPW &&
 458         pkt_ver != KRB5_KPASSWD_VERS_SETPW) {
 459         krb5_warnx (context, "Bad version (%d)", pkt_ver);
 460         reply_error (NULL, s, sa, sa_size, 0, 1, "Wrong program version");
 461         return 1;
 462     }
 463     *version = pkt_ver;
 464
 465     ap_req_data.data   = msg + 6;
 466     ap_req_data.length = ap_req_len;
 467
 468     ret = krb5_rd_req (context,
 469                        auth_context,
 470                        &ap_req_data,
 471                        NULL,
 472                        keytab,
 473                        NULL,
 474                        ticket);
 475     if (ret) {
 476         krb5_warn (context, ret, "krb5_rd_req");
 477         reply_error (NULL, s, sa, sa_size, ret, 3, "Authentication failed");
 478         return 1;
 479     }
 480
 481     /* verify realm and principal */
 482     for (r = realms; *r != NULL; r++) {
 483         krb5_principal principal;
 484         krb5_boolean same;
 485
 486         ret = krb5_make_principal (context,
 487                                    &principal,
 488                                    *r,
 489                                    "kadmin",
 490                                    "changepw",
 491                                    NULL);
 492         if (ret)
 493             krb5_err (context, 1, ret, "krb5_make_principal");
 494
 495         same = krb5_principal_compare(context, principal, (*ticket)->server);
 496         krb5_free_principal(context, principal);
 497         if (same == TRUE)
 498             break;
 499     }
 500     if (*r == NULL) {
 501         char *str;
 502         krb5_unparse_name(context, (*ticket)->server, &str);
 503         krb5_warnx (context, "client used not valid principal %s", str);
 504         free(str);
 505         reply_error (NULL, s, sa, sa_size, ret, 1,
 506                      "Bad request");
 507         goto out;
 508     }
 509
 510     if (strcmp((*ticket)->server->realm, (*ticket)->client->realm) != 0) {
 511         krb5_warnx (context, "server realm (%s) not same a client realm (%s)",
 512                     (*ticket)->server->realm, (*ticket)->client->realm);
 513         reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 1,
 514                      "Bad request");
 515         goto out;
 516     }
 517
 518     if (!(*ticket)->ticket.flags.initial) {
 519         krb5_warnx (context, "initial flag not set");
 520         reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 1,
 521                      "Bad request");
 522         goto out;
 523     }
 524     krb_priv_data.data   = msg + 6 + ap_req_len;
 525     krb_priv_data.length = len - 6 - ap_req_len;
 526
 527     ret = krb5_rd_priv (context,
 528                         *auth_context,
 529                         &krb_priv_data,
 530                         out_data,
 531                         NULL);
 532
 533     if (ret) {
 534         krb5_warn (context, ret, "krb5_rd_priv");
 535         reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 3,
 536                      "Bad request");
 537         goto out;
 538     }
 539     return 0;
 540 out:
 541     krb5_free_ticket (context, *ticket);
 542     ticket = NULL;
 543     return 1;
 544 }
 545
 546 static void
 547 process (krb5_realm *realms,
 548          krb5_keytab keytab,
 549          int s,
 550          krb5_address *this_addr,
 551          struct sockaddr *sa,
 552          int sa_size,
 553          u_char *msg,
 554          int len)
 555 {
 556     krb5_error_code ret;
 557     krb5_auth_context auth_context = NULL;
 558     krb5_data out_data;
 559     krb5_ticket *ticket;
 560     krb5_address other_addr;
 561     uint16_t version;
 562
 563
 564     krb5_data_zero (&out_data);
 565
 566     ret = krb5_auth_con_init (context, &auth_context);
 567     if (ret) {
 568         krb5_warn (context, ret, "krb5_auth_con_init");
 569         return;
 570     }
 571
 572     krb5_auth_con_setflags (context, auth_context,
 573                             KRB5_AUTH_CONTEXT_DO_SEQUENCE);
 574
 575     ret = krb5_sockaddr2address (context, sa, &other_addr);
 576     if (ret) {
 577         krb5_warn (context, ret, "krb5_sockaddr2address");
 578         goto out;
 579     }
 580
 581     ret = krb5_auth_con_setaddrs (context,
 582                                   auth_context,
 583                                   this_addr,
 584                                   &other_addr);
 585     krb5_free_address (context, &other_addr);
 586     if (ret) {
 587         krb5_warn (context, ret, "krb5_auth_con_setaddr");
 588         goto out;
 589     }
 590
 591     if (verify (&auth_context, realms, keytab, &ticket, &out_data,
 592                 &version, s, sa, sa_size, msg, len) == 0) {
 593         change (auth_context,
 594                 ticket->client,
 595                 version,
 596                 s,
 597                 sa, sa_size,
 598                 &out_data);
 599         memset (out_data.data, 0, out_data.length);
 600         krb5_free_ticket (context, ticket);
 601     }
 602
 603 out:
 604     krb5_data_free (&out_data);
 605     krb5_auth_con_free (context, auth_context);
 606 }
 607
 608 static int
 609 doit (krb5_keytab keytab, int port)
 610 {
 611     krb5_error_code ret;
 612     int *sockets;
 613     int maxfd;
 614     krb5_realm *realms;
 615     krb5_addresses addrs;
 616     unsigned n, i;
 617     fd_set real_fdset;
 618     struct sockaddr_storage __ss;
 619     struct sockaddr *sa = (struct sockaddr *)&__ss;
 620
 621     ret = krb5_get_default_realms(context, &realms);
 622     if (ret)
 623         krb5_err (context, 1, ret, "krb5_get_default_realms");
 624
 625     if (explicit_addresses.len) {
 626         addrs = explicit_addresses;
 627     } else {
 628         ret = krb5_get_all_server_addrs (context, &addrs);
 629         if (ret)
 630             krb5_err (context, 1, ret, "krb5_get_all_server_addrs");
 631     }
 632     n = addrs.len;
 633
 634     sockets = malloc (n * sizeof(*sockets));
 635     if (sockets == NULL)
 636         krb5_errx (context, 1, "out of memory");
 637     maxfd = -1;
 638     FD_ZERO(&real_fdset);
 639     for (i = 0; i < n; ++i) {
 640         krb5_socklen_t sa_size = sizeof(__ss);
 641
 642         krb5_addr2sockaddr (context, &addrs.val[i], sa, &sa_size, port);
 643
 644         sockets[i] = socket (sa->sa_family, SOCK_DGRAM, 0);
 645         if (sockets[i] < 0)
 646             krb5_err (context, 1, errno, "socket");
 647         if (bind (sockets[i], sa, sa_size) < 0) {
 648             char str[128];
 649             size_t len;
 650             int save_errno = errno;
 651
 652             ret = krb5_print_address (&addrs.val[i], str, sizeof(str), &len);
 653             if (ret)
 654                 strlcpy(str, "unknown address", sizeof(str));
 655             krb5_warn (context, save_errno, "bind(%s)", str);
 656             continue;
 657         }
 658         maxfd = max (maxfd, sockets[i]);
 659         if (maxfd >= FD_SETSIZE)
 660             krb5_errx (context, 1, "fd too large");
 661         FD_SET(sockets[i], &real_fdset);
 662     }
 663     if (maxfd == -1)
 664         krb5_errx (context, 1, "No sockets!");
 665
 666     while(exit_flag == 0) {
 667         int ret;
 668         fd_set fdset = real_fdset;
 669
 670         ret = select (maxfd + 1, &fdset, NULL, NULL, NULL);
 671         if (ret < 0) {
 672             if (errno == EINTR)
 673                 continue;
 674             else
 675                 krb5_err (context, 1, errno, "select");
 676         }
 677         for (i = 0; i < n; ++i)
 678             if (FD_ISSET(sockets[i], &fdset)) {
 679                 u_char buf[BUFSIZ];
 680                 socklen_t addrlen = sizeof(__ss);
 681
 682                 ret = recvfrom (sockets[i], buf, sizeof(buf), 0,
 683                                 sa, &addrlen);
 684                 if (ret < 0) {
 685                     if(errno == EINTR)
 686                         break;
 687                     else
 688                         krb5_err (context, 1, errno, "recvfrom");
 689                 }
 690
 691                 process (realms, keytab, sockets[i],
 692                          &addrs.val[i],
 693                          sa, addrlen,
 694                          buf, ret);
 695             }
 696     }
 697
 698     for (i = 0; i < n; ++i)
 699         close(sockets[i]);
 700     free(sockets);
 701
 702     krb5_free_addresses (context, &addrs);
 703     krb5_free_host_realm (context, realms);
 704     krb5_free_context (context);
 705     return 0;
 706 }
 707
 708 static RETSIGTYPE
 709 sigterm(int sig)
 710 {
 711     exit_flag = 1;
 712 }
 713
 714 static const char *check_library  = NULL;
 715 static const char *check_function = NULL;
 716 static getarg_strings policy_libraries = { 0, NULL };
 717 static char *keytab_str = "HDB:";
 718 static char *realm_str;
 719 static int version_flag;
 720 static int help_flag;
 721 static char *port_str;
 722 static char *config_file;
 723
 724 struct getargs args[] = {
 725 #ifdef HAVE_DLOPEN
 726     { "check-library", 0, arg_string, &check_library,
 727       "library to load password check function from", "library" },
 728     { "check-function", 0, arg_string, &check_function,
 729       "password check function to load", "function" },
 730     { "policy-libraries", 0, arg_strings, &policy_libraries,
 731       "password check function to load", "function" },
 732 #endif
 733     { "addresses",      0,      arg_strings, &addresses_str,
 734       "addresses to listen on", "list of addresses" },
 735     { "keytab", 'k', arg_string, &keytab_str,
 736       "keytab to get authentication key from", "kspec" },
 737     { "config-file", 'c', arg_string, &config_file },
 738     { "realm", 'r', arg_string, &realm_str, "default realm", "realm" },
 739     { "port",  'p', arg_string, &port_str, "port" },
 740     { "version", 0, arg_flag, &version_flag },
 741     { "help", 0, arg_flag, &help_flag }
 742 };
 743 int num_args = sizeof(args) / sizeof(args[0]);
 744
 745 int
 746 main (int argc, char **argv)
 747 {
 748     int optind;
 749     krb5_keytab keytab;
 750     krb5_error_code ret;
 751     char **files;
 752     int port, i;
 753
 754     optind = krb5_program_setup(&context, argc, argv, args, num_args, NULL);
 755
 756     if(help_flag)
 757         krb5_std_usage(0, args, num_args);
 758     if(version_flag) {
 759         print_version(NULL);
 760         exit(0);
 761     }
 762
 763     if (config_file == NULL) {
 764         asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 765         if (config_file == NULL)
 766             errx(1, "out of memory");
 767     }
 768
 769     ret = krb5_prepend_config_files_default(config_file, &files);
 770     if (ret)
 771         krb5_err(context, 1, ret, "getting configuration files");
 772
 773     ret = krb5_set_config_files(context, files);
 774     krb5_free_config_files(files);
 775     if (ret)
 776         krb5_err(context, 1, ret, "reading configuration files");
 777
 778     if(realm_str)
 779         krb5_set_default_realm(context, realm_str);
 780
 781     krb5_openlog (context, "kpasswdd", &log_facility);
 782     krb5_set_warn_dest(context, log_facility);
 783
 784     if (port_str != NULL) {
 785         struct servent *s = roken_getservbyname (port_str, "udp");
 786
 787         if (s != NULL)
 788             port = s->s_port;
 789         else {
 790             char *ptr;
 791
 792             port = strtol (port_str, &ptr, 10);
 793             if (port == 0 && ptr == port_str)
 794                 krb5_errx (context, 1, "bad port `%s'", port_str);
 795             port = htons(port);
 796         }
 797     } else
 798         port = krb5_getportbyname (context, "kpasswd", "udp", KPASSWD_PORT);
 799
 800     ret = krb5_kt_register(context, &hdb_kt_ops);
 801     if(ret)
 802         krb5_err(context, 1, ret, "krb5_kt_register");
 803
 804     ret = krb5_kt_resolve(context, keytab_str, &keytab);
 805     if(ret)
 806         krb5_err(context, 1, ret, "%s", keytab_str);
 807
 808     kadm5_setup_passwd_quality_check (context, check_library, check_function);
 809
 810     for (i = 0; i < policy_libraries.num_strings; i++) {
 811         ret = kadm5_add_passwd_quality_verifier(context,
 812                                                 policy_libraries.strings[i]);
 813         if (ret)
 814             krb5_err(context, 1, ret, "kadm5_add_passwd_quality_verifier");
 815     }
 816     ret = kadm5_add_passwd_quality_verifier(context, NULL);
 817     if (ret)
 818         krb5_err(context, 1, ret, "kadm5_add_passwd_quality_verifier");
 819
 820
 821     explicit_addresses.len = 0;
 822
 823     if (addresses_str.num_strings) {
 824         int i;
 825
 826         for (i = 0; i < addresses_str.num_strings; ++i)
 827             add_one_address (addresses_str.strings[i], i == 0);
 828         free_getarg_strings (&addresses_str);
 829     } else {
 830         char **foo = krb5_config_get_strings (context, NULL,
 831                                               "kdc", "addresses", NULL);
 832
 833         if (foo != NULL) {
 834             add_one_address (*foo++, TRUE);
 835             while (*foo)
 836                 add_one_address (*foo++, FALSE);
 837         }
 838     }
 839
 840 #ifdef HAVE_SIGACTION
 841     {
 842         struct sigaction sa;
 843
 844         sa.sa_flags = 0;
 845         sa.sa_handler = sigterm;
 846         sigemptyset(&sa.sa_mask);
 847
 848         sigaction(SIGINT,  &sa, NULL);
 849         sigaction(SIGTERM, &sa, NULL);
 850     }
 851 #else
 852     signal(SIGINT,  sigterm);
 853     signal(SIGTERM, sigterm);
 854 #endif
 855
 856     pidfile(NULL);
 857
 858     return doit (keytab, port);
 859 }