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 = 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     pkt_len = (msg[0] << 8) | (msg[1]);
 451     pkt_ver = (msg[2] << 8) | (msg[3]);
 452     ap_req_len = (msg[4] << 8) | (msg[5]);
 453     if (pkt_len != len) {
 454         krb5_warnx (context, "Strange len: %ld != %ld",
 455                     (long)pkt_len, (long)len);
 456         reply_error (NULL, s, sa, sa_size, 0, 1, "Bad request");
 457         return 1;
 458     }
 459     if (pkt_ver != KRB5_KPASSWD_VERS_CHANGEPW &&
 460         pkt_ver != KRB5_KPASSWD_VERS_SETPW) {
 461         krb5_warnx (context, "Bad version (%d)", pkt_ver);
 462         reply_error (NULL, s, sa, sa_size, 0, 1, "Wrong program version");
 463         return 1;
 464     }
 465     *version = pkt_ver;
 466
 467     ap_req_data.data   = msg + 6;
 468     ap_req_data.length = ap_req_len;
 469
 470     ret = krb5_rd_req (context,
 471                        auth_context,
 472                        &ap_req_data,
 473                        NULL,
 474                        keytab,
 475                        NULL,
 476                        ticket);
 477     if (ret) {
 478         krb5_warn (context, ret, "krb5_rd_req");
 479         reply_error (NULL, s, sa, sa_size, ret, 3, "Authentication failed");
 480         return 1;
 481     }
 482
 483     /* verify realm and principal */
 484     for (r = realms; *r != NULL; r++) {
 485         krb5_principal principal;
 486         krb5_boolean same;
 487
 488         ret = krb5_make_principal (context,
 489                                    &principal,
 490                                    *r,
 491                                    "kadmin",
 492                                    "changepw",
 493                                    NULL);
 494         if (ret)
 495             krb5_err (context, 1, ret, "krb5_make_principal");
 496
 497         same = krb5_principal_compare(context, principal, (*ticket)->server);
 498         krb5_free_principal(context, principal);
 499         if (same == TRUE)
 500             break;
 501     }
 502     if (*r == NULL) {
 503         char *str;
 504         krb5_unparse_name(context, (*ticket)->server, &str);
 505         krb5_warnx (context, "client used not valid principal %s", str);
 506         free(str);
 507         reply_error (NULL, s, sa, sa_size, ret, 1,
 508                      "Bad request");
 509         goto out;
 510     }
 511
 512     if (strcmp((*ticket)->server->realm, (*ticket)->client->realm) != 0) {
 513         krb5_warnx (context, "server realm (%s) not same a client realm (%s)",
 514                     (*ticket)->server->realm, (*ticket)->client->realm);
 515         reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 1,
 516                      "Bad request");
 517         goto out;
 518     }
 519
 520     if (!(*ticket)->ticket.flags.initial) {
 521         krb5_warnx (context, "initial flag not set");
 522         reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 1,
 523                      "Bad request");
 524         goto out;
 525     }
 526     krb_priv_data.data   = msg + 6 + ap_req_len;
 527     krb_priv_data.length = len - 6 - ap_req_len;
 528
 529     ret = krb5_rd_priv (context,
 530                         *auth_context,
 531                         &krb_priv_data,
 532                         out_data,
 533                         NULL);
 534
 535     if (ret) {
 536         krb5_warn (context, ret, "krb5_rd_priv");
 537         reply_error ((*ticket)->server->realm, s, sa, sa_size, ret, 3,
 538                      "Bad request");
 539         goto out;
 540     }
 541     return 0;
 542 out:
 543     krb5_free_ticket (context, *ticket);
 544     ticket = NULL;
 545     return 1;
 546 }
 547
 548 static void
 549 process (krb5_realm *realms,
 550          krb5_keytab keytab,
 551          int s,
 552          krb5_address *this_addr,
 553          struct sockaddr *sa,
 554          int sa_size,
 555          u_char *msg,
 556          int len)
 557 {
 558     krb5_error_code ret;
 559     krb5_auth_context auth_context = NULL;
 560     krb5_data out_data;
 561     krb5_ticket *ticket;
 562     krb5_address other_addr;
 563     uint16_t version;
 564
 565
 566     krb5_data_zero (&out_data);
 567
 568     ret = krb5_auth_con_init (context, &auth_context);
 569     if (ret) {
 570         krb5_warn (context, ret, "krb5_auth_con_init");
 571         return;
 572     }
 573
 574     krb5_auth_con_setflags (context, auth_context,
 575                             KRB5_AUTH_CONTEXT_DO_SEQUENCE);
 576
 577     ret = krb5_sockaddr2address (context, sa, &other_addr);
 578     if (ret) {
 579         krb5_warn (context, ret, "krb5_sockaddr2address");
 580         goto out;
 581     }
 582
 583     ret = krb5_auth_con_setaddrs (context,
 584                                   auth_context,
 585                                   this_addr,
 586                                   &other_addr);
 587     krb5_free_address (context, &other_addr);
 588     if (ret) {
 589         krb5_warn (context, ret, "krb5_auth_con_setaddr");
 590         goto out;
 591     }
 592
 593     if (verify (&auth_context, realms, keytab, &ticket, &out_data,
 594                 &version, s, sa, sa_size, msg, len) == 0) {
 595         change (auth_context,
 596                 ticket->client,
 597                 version,
 598                 s,
 599                 sa, sa_size,
 600                 &out_data);
 601         memset (out_data.data, 0, out_data.length);
 602         krb5_free_ticket (context, ticket);
 603     }
 604
 605 out:
 606     krb5_data_free (&out_data);
 607     krb5_auth_con_free (context, auth_context);
 608 }
 609
 610 static int
 611 doit (krb5_keytab keytab, int port)
 612 {
 613     krb5_error_code ret;
 614     int *sockets;
 615     int maxfd;
 616     krb5_realm *realms;
 617     krb5_addresses addrs;
 618     unsigned n, i;
 619     fd_set real_fdset;
 620     struct sockaddr_storage __ss;
 621     struct sockaddr *sa = (struct sockaddr *)&__ss;
 622
 623     ret = krb5_get_default_realms(context, &realms);
 624     if (ret)
 625         krb5_err (context, 1, ret, "krb5_get_default_realms");
 626
 627     if (explicit_addresses.len) {
 628         addrs = explicit_addresses;
 629     } else {
 630         ret = krb5_get_all_server_addrs (context, &addrs);
 631         if (ret)
 632             krb5_err (context, 1, ret, "krb5_get_all_server_addrs");
 633     }
 634     n = addrs.len;
 635
 636     sockets = malloc (n * sizeof(*sockets));
 637     if (sockets == NULL)
 638         krb5_errx (context, 1, "out of memory");
 639     maxfd = -1;
 640     FD_ZERO(&real_fdset);
 641     for (i = 0; i < n; ++i) {
 642         krb5_socklen_t sa_size = sizeof(__ss);
 643
 644         krb5_addr2sockaddr (context, &addrs.val[i], sa, &sa_size, port);
 645
 646         sockets[i] = socket (sa->sa_family, SOCK_DGRAM, 0);
 647         if (sockets[i] < 0)
 648             krb5_err (context, 1, errno, "socket");
 649         if (bind (sockets[i], sa, sa_size) < 0) {
 650             char str[128];
 651             size_t len;
 652             int save_errno = errno;
 653
 654             ret = krb5_print_address (&addrs.val[i], str, sizeof(str), &len);
 655             if (ret)
 656                 strlcpy(str, "unknown address", sizeof(str));
 657             krb5_warn (context, save_errno, "bind(%s)", str);
 658             continue;
 659         }
 660         maxfd = max (maxfd, sockets[i]);
 661         if (maxfd >= FD_SETSIZE)
 662             krb5_errx (context, 1, "fd too large");
 663         FD_SET(sockets[i], &real_fdset);
 664     }
 665     if (maxfd == -1)
 666         krb5_errx (context, 1, "No sockets!");
 667
 668     while(exit_flag == 0) {
 669         int ret;
 670         fd_set fdset = real_fdset;
 671
 672         ret = select (maxfd + 1, &fdset, NULL, NULL, NULL);
 673         if (ret < 0) {
 674             if (errno == EINTR)
 675                 continue;
 676             else
 677                 krb5_err (context, 1, errno, "select");
 678         }
 679         for (i = 0; i < n; ++i)
 680             if (FD_ISSET(sockets[i], &fdset)) {
 681                 u_char buf[BUFSIZ];
 682                 socklen_t addrlen = sizeof(__ss);
 683
 684                 ret = recvfrom (sockets[i], buf, sizeof(buf), 0,
 685                                 sa, &addrlen);
 686                 if (ret < 0) {
 687                     if(errno == EINTR)
 688                         break;
 689                     else
 690                         krb5_err (context, 1, errno, "recvfrom");
 691                 }
 692
 693                 process (realms, keytab, sockets[i],
 694                          &addrs.val[i],
 695                          sa, addrlen,
 696                          buf, ret);
 697             }
 698     }
 699
 700     for (i = 0; i < n; ++i)
 701         close(sockets[i]);
 702     free(sockets);
 703
 704     krb5_free_addresses (context, &addrs);
 705     krb5_free_host_realm (context, realms);
 706     krb5_free_context (context);
 707     return 0;
 708 }
 709
 710 static RETSIGTYPE
 711 sigterm(int sig)
 712 {
 713     exit_flag = 1;
 714 }
 715
 716 static const char *check_library  = NULL;
 717 static const char *check_function = NULL;
 718 static getarg_strings policy_libraries = { 0, NULL };
 719 static char *keytab_str = "HDB:";
 720 static char *realm_str;
 721 static int version_flag;
 722 static int help_flag;
 723 static char *port_str;
 724 static char *config_file;
 725
 726 struct getargs args[] = {
 727 #ifdef HAVE_DLOPEN
 728     { "check-library", 0, arg_string, &check_library,
 729       "library to load password check function from", "library" },
 730     { "check-function", 0, arg_string, &check_function,
 731       "password check function to load", "function" },
 732     { "policy-libraries", 0, arg_strings, &policy_libraries,
 733       "password check function to load", "function" },
 734 #endif
 735     { "addresses",      0,      arg_strings, &addresses_str,
 736       "addresses to listen on", "list of addresses" },
 737     { "keytab", 'k', arg_string, &keytab_str,
 738       "keytab to get authentication key from", "kspec" },
 739     { "config-file", 'c', arg_string, &config_file },
 740     { "realm", 'r', arg_string, &realm_str, "default realm", "realm" },
 741     { "port",  'p', arg_string, &port_str, "port" },
 742     { "version", 0, arg_flag, &version_flag },
 743     { "help", 0, arg_flag, &help_flag }
 744 };
 745 int num_args = sizeof(args) / sizeof(args[0]);
 746
 747 int
 748 main (int argc, char **argv)
 749 {
 750     krb5_keytab keytab;
 751     krb5_error_code ret;
 752     char **files;
 753     int port, i;
 754
 755     krb5_program_setup(&context, argc, argv, args, num_args, NULL);
 756
 757     if(help_flag)
 758         krb5_std_usage(0, args, num_args);
 759     if(version_flag) {
 760         print_version(NULL);
 761         exit(0);
 762     }
 763
 764     if (config_file == NULL) {
 765         asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 766         if (config_file == NULL)
 767             errx(1, "out of memory");
 768     }
 769
 770     ret = krb5_prepend_config_files_default(config_file, &files);
 771     if (ret)
 772         krb5_err(context, 1, ret, "getting configuration files");
 773
 774     ret = krb5_set_config_files(context, files);
 775     krb5_free_config_files(files);
 776     if (ret)
 777         krb5_err(context, 1, ret, "reading configuration files");
 778
 779     if(realm_str)
 780         krb5_set_default_realm(context, realm_str);
 781
 782     krb5_openlog (context, "kpasswdd", &log_facility);
 783     krb5_set_warn_dest(context, log_facility);
 784
 785     if (port_str != NULL) {
 786         struct servent *s = roken_getservbyname (port_str, "udp");
 787
 788         if (s != NULL)
 789             port = s->s_port;
 790         else {
 791             char *ptr;
 792
 793             port = strtol (port_str, &ptr, 10);
 794             if (port == 0 && ptr == port_str)
 795                 krb5_errx (context, 1, "bad port `%s'", port_str);
 796             port = htons(port);
 797         }
 798     } else
 799         port = krb5_getportbyname (context, "kpasswd", "udp", KPASSWD_PORT);
 800
 801     ret = krb5_kt_register(context, &hdb_kt_ops);
 802     if(ret)
 803         krb5_err(context, 1, ret, "krb5_kt_register");
 804
 805     ret = krb5_kt_resolve(context, keytab_str, &keytab);
 806     if(ret)
 807         krb5_err(context, 1, ret, "%s", keytab_str);
 808
 809     kadm5_setup_passwd_quality_check (context, check_library, check_function);
 810
 811     for (i = 0; i < policy_libraries.num_strings; i++) {
 812         ret = kadm5_add_passwd_quality_verifier(context,
 813                                                 policy_libraries.strings[i]);
 814         if (ret)
 815             krb5_err(context, 1, ret, "kadm5_add_passwd_quality_verifier");
 816     }
 817     ret = kadm5_add_passwd_quality_verifier(context, NULL);
 818     if (ret)
 819         krb5_err(context, 1, ret, "kadm5_add_passwd_quality_verifier");
 820
 821
 822     explicit_addresses.len = 0;
 823
 824     if (addresses_str.num_strings) {
 825         int i;
 826
 827         for (i = 0; i < addresses_str.num_strings; ++i)
 828             add_one_address (addresses_str.strings[i], i == 0);
 829         free_getarg_strings (&addresses_str);
 830     } else {
 831         char **foo = krb5_config_get_strings (context, NULL,
 832                                               "kdc", "addresses", NULL);
 833
 834         if (foo != NULL) {
 835             add_one_address (*foo++, TRUE);
 836             while (*foo)
 837                 add_one_address (*foo++, FALSE);
 838         }
 839     }
 840
 841 #ifdef HAVE_SIGACTION
 842     {
 843         struct sigaction sa;
 844
 845         sa.sa_flags = 0;
 846         sa.sa_handler = sigterm;
 847         sigemptyset(&sa.sa_mask);
 848
 849         sigaction(SIGINT,  &sa, NULL);
 850         sigaction(SIGTERM, &sa, NULL);
 851     }
 852 #else
 853     signal(SIGINT,  sigterm);
 854     signal(SIGTERM, sigterm);
 855 #endif
 856
 857     pidfile(NULL);
 858
 859     return doit (keytab, port);
 860 }