src/main/mainconfig.c

   1 /*
   2  * mainconf.c   Handle the server's configuration.
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * Copyright 2002  The FreeRADIUS server project
  21  * Copyright 2002  Alan DeKok <aland@ox.org>
  22  */
  23
  24 #include "autoconf.h"
  25
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #ifdef HAVE_NETINET_IN_H
  30 #include <netinet/in.h>
  31 #endif
  32
  33 #ifdef HAVE_ARPA_INET_H
  34 #include <arpa/inet.h>
  35 #endif
  36
  37 #include "radiusd.h"
  38 #include "rad_assert.h"
  39 #include "conffile.h"
  40 #include "token.h"
  41
  42 #include <sys/resource.h>
  43 #include <unistd.h>
  44 #include <sys/types.h>
  45 #include <sys/socket.h>
  46 #include <netdb.h>
  47 #include <sys/stat.h>
  48 #include <grp.h>
  49 #include <pwd.h>
  50
  51
  52 #ifdef HAVE_SYSLOG_H
  53 #       include <syslog.h>
  54 #endif
  55
  56 struct main_config_t mainconfig;
  57
  58 /*
  59  *      Temporary local variables for parsing the configuration
  60  *      file.
  61  */
  62 static uid_t server_uid;
  63 static gid_t server_gid;
  64
  65 /*
  66  *      These are not used anywhere else..
  67  */
  68 static const char *localstatedir = NULL;
  69 static const char *prefix = NULL;
  70 static char *syslog_facility = NULL;
  71 static const LRAD_NAME_NUMBER str2fac[] = {
  72 #ifdef LOG_KERN
  73         { "kern", LOG_KERN },
  74 #endif
  75 #ifdef LOG_USER
  76         { "user", LOG_USER },
  77 #endif
  78 #ifdef LOG_MAIL
  79         { "mail", LOG_MAIL },
  80 #endif
  81 #ifdef LOG_DAEMON
  82         { "daemon", LOG_DAEMON },
  83 #endif
  84 #ifdef LOG_AUTH
  85         { "auth", LOG_AUTH },
  86 #endif
  87 #ifdef LOG_LPR
  88         { "lpr", LOG_LPR },
  89 #endif
  90 #ifdef LOG_NEWS
  91         { "news", LOG_NEWS },
  92 #endif
  93 #ifdef LOG_UUCP
  94         { "uucp", LOG_UUCP },
  95 #endif
  96 #ifdef LOG_CRON
  97         { "cron", LOG_CRON },
  98 #endif
  99 #ifdef LOG_AUTHPRIV
 100         { "authpriv", LOG_AUTHPRIV },
 101 #endif
 102 #ifdef LOG_FTP
 103         { "ftp", LOG_FTP },
 104 #endif
 105 #ifdef LOG_LOCAL0
 106         { "local0", LOG_LOCAL0 },
 107 #endif
 108 #ifdef LOG_LOCAL1
 109         { "local1", LOG_LOCAL1 },
 110 #endif
 111 #ifdef LOG_LOCAL2
 112         { "local2", LOG_LOCAL2 },
 113 #endif
 114 #ifdef LOG_LOCAL3
 115         { "local3", LOG_LOCAL3 },
 116 #endif
 117 #ifdef LOG_LOCAL4
 118         { "local4", LOG_LOCAL4 },
 119 #endif
 120 #ifdef LOG_LOCAL5
 121         { "local5", LOG_LOCAL5 },
 122 #endif
 123 #ifdef LOG_LOCAL6
 124         { "local6", LOG_LOCAL6 },
 125 #endif
 126 #ifdef LOG_LOCAL7
 127         { "local7", LOG_LOCAL7 },
 128 #endif
 129         { NULL, -1 }
 130 };
 131
 132 /*
 133  *  Map the proxy server configuration parameters to variables.
 134  */
 135 static const CONF_PARSER proxy_config[] = {
 136         { "retry_delay",  PW_TYPE_INTEGER, 0, &mainconfig.proxy_retry_delay, Stringify(RETRY_DELAY) },
 137         { "retry_count",  PW_TYPE_INTEGER, 0, &mainconfig.proxy_retry_count, Stringify(RETRY_COUNT) },
 138         { "default_fallback", PW_TYPE_BOOLEAN, 0, &mainconfig.proxy_fallback, "no" },
 139         { "dead_time",    PW_TYPE_INTEGER, 0, &mainconfig.proxy_dead_time, Stringify(DEAD_TIME) },
 140         { "wake_all_if_all_dead", PW_TYPE_BOOLEAN, 0, &mainconfig.wake_all_if_all_dead, "no" },
 141         { "proxy_fail_type", PW_TYPE_STRING_PTR, 0, &mainconfig.proxy_fail_type, NULL},
 142         { NULL, -1, 0, NULL, NULL }
 143 };
 144
 145
 146 /*
 147  *  Security configuration for the server.
 148  */
 149 static const CONF_PARSER security_config[] = {
 150         { "max_attributes",  PW_TYPE_INTEGER, 0, &librad_max_attributes, Stringify(0) },
 151         { "reject_delay",  PW_TYPE_INTEGER, 0, &mainconfig.reject_delay, Stringify(0) },
 152         { "status_server", PW_TYPE_BOOLEAN, 0, &mainconfig.status_server, "no"},
 153         { NULL, -1, 0, NULL, NULL }
 154 };
 155
 156
 157 /*
 158  *  syslog configuration for the server.
 159  */
 160 static const CONF_PARSER log_config[] = {
 161         { "syslog_facility",  PW_TYPE_STRING_PTR, 0, &syslog_facility, Stringify(0) },
 162         { NULL, -1, 0, NULL, NULL }
 163 };
 164
 165
 166 /*
 167  *  A mapping of configuration file names to internal variables
 168  */
 169 static const CONF_PARSER server_config[] = {
 170         /*
 171          *      FIXME: 'prefix' is the ONLY one which should be
 172          *      configured at compile time.  Hard-coding it here is
 173          *      bad.  It will be cleaned up once we clean up the
 174          *      hard-coded defines for the locations of the various
 175          *      files.
 176          */
 177         { "prefix",             PW_TYPE_STRING_PTR, 0, &prefix,            "/usr/local"},
 178         { "localstatedir",      PW_TYPE_STRING_PTR, 0, &localstatedir,     "${prefix}/var"},
 179         { "logdir",             PW_TYPE_STRING_PTR, 0, &radlog_dir,        "${localstatedir}/log"},
 180         { "libdir",             PW_TYPE_STRING_PTR, 0, &radlib_dir,        "${prefix}/lib"},
 181         { "radacctdir",         PW_TYPE_STRING_PTR, 0, &radacct_dir,       "${logdir}/radacct" },
 182         { "hostname_lookups",   PW_TYPE_BOOLEAN,    0, &librad_dodns,      "no" },
 183 #ifdef WITH_SNMP
 184         { "snmp",               PW_TYPE_BOOLEAN,    0, &mainconfig.do_snmp,      "no" },
 185 #endif
 186         { "max_request_time", PW_TYPE_INTEGER, 0, &mainconfig.max_request_time, Stringify(MAX_REQUEST_TIME) },
 187         { "cleanup_delay", PW_TYPE_INTEGER, 0, &mainconfig.cleanup_delay, Stringify(CLEANUP_DELAY) },
 188         { "max_requests", PW_TYPE_INTEGER, 0, &mainconfig.max_requests, Stringify(MAX_REQUESTS) },
 189         { "delete_blocked_requests", PW_TYPE_INTEGER, 0, &mainconfig.kill_unresponsive_children, Stringify(FALSE) },
 190         { "allow_core_dumps", PW_TYPE_BOOLEAN, 0, &mainconfig.allow_core_dumps, "no" },
 191         { "log_stripped_names", PW_TYPE_BOOLEAN, 0, &log_stripped_names,"no" },
 192
 193         { "log_file", PW_TYPE_STRING_PTR, -1, &mainconfig.log_file, "${logdir}/radius.log" },
 194         { "log_auth", PW_TYPE_BOOLEAN, -1, &mainconfig.log_auth, "no" },
 195         { "log_auth_badpass", PW_TYPE_BOOLEAN, 0, &mainconfig.log_auth_badpass, "no" },
 196         { "log_auth_goodpass", PW_TYPE_BOOLEAN, 0, &mainconfig.log_auth_goodpass, "no" },
 197         { "pidfile", PW_TYPE_STRING_PTR, 0, &mainconfig.pid_file, "${run_dir}/radiusd.pid"},
 198         { "user", PW_TYPE_STRING_PTR, 0, &mainconfig.uid_name, NULL},
 199         { "group", PW_TYPE_STRING_PTR, 0, &mainconfig.gid_name, NULL},
 200         { "checkrad", PW_TYPE_STRING_PTR, 0, &mainconfig.checkrad, "${sbindir}/checkrad" },
 201
 202         { "debug_level", PW_TYPE_INTEGER, 0, &mainconfig.debug_level, "0"},
 203
 204         { "proxy_requests", PW_TYPE_BOOLEAN, 0, &mainconfig.proxy_requests, "yes" },
 205         { "log", PW_TYPE_SUBSECTION, 0, log_config, NULL },
 206         { "proxy", PW_TYPE_SUBSECTION, 0, proxy_config, NULL },
 207         { "security", PW_TYPE_SUBSECTION, 0, security_config, NULL },
 208         { NULL, -1, 0, NULL, NULL }
 209 };
 210
 211
 212 #define MAX_ARGV (256)
 213 /*
 214  *      Xlat for %{config:section.subsection.attribute}
 215  */
 216 static int xlat_config(void *instance, REQUEST *request,
 217                        char *fmt, char *out,
 218                        size_t outlen,
 219                        RADIUS_ESCAPE_STRING func)
 220 {
 221         CONF_SECTION *cs;
 222         CONF_PAIR *cp;
 223         int i, argc, left;
 224         const char *from, *value;
 225         char *to;
 226         char myfmt[1024];
 227         char argv_buf[1024];
 228         char *argv[MAX_ARGV];
 229
 230         request = request;      /* -Wunused */
 231         instance = instance;    /* -Wunused */
 232
 233         cp = NULL;
 234         cs = NULL;
 235
 236         /*
 237          *      Split the string into argv's BEFORE doing radius_xlat...
 238          *      Copied from exec.c
 239          */
 240         from = fmt;
 241         to = myfmt;
 242         argc = 0;
 243         while (*from) {
 244                 int flag, length;
 245
 246                 flag = 0;
 247                 argv[argc] = to;
 248                 argc++;
 249
 250                 if (argc >= (MAX_ARGV - 1)) break;
 251
 252                 /*
 253                  *      Copy the argv over to our buffer.
 254                  */
 255                 while (*from) {
 256                         if (to >= myfmt + sizeof(myfmt) - 1) {
 257                                 return 0; /* no error msg */
 258                         }
 259
 260                         switch (*from) {
 261                         case '%':
 262                                 if (from[1] == '{') {
 263                                         *(to++) = *(from++);
 264
 265                                         length = rad_copy_variable(to, from);
 266                                         if (length < 0) {
 267                                                 return -1;
 268                                         }
 269                                         from += length;
 270                                         to += length;
 271                                 } else { /* FIXME: catch %%{ ? */
 272                                         *(to++) = *(from++);
 273                                 }
 274                                 break;
 275
 276                         case '[':
 277                                 if (flag != 0) {
 278                                         radlog(L_ERR, "config: Unexpected nested '[' in \"%s\"", fmt);
 279                                         return 0;
 280                                 }
 281                                 flag++;
 282                                 *(to++) = *(from++);
 283                                 break;
 284
 285                         case ']':
 286                                 if (flag == 0) {
 287                                         radlog(L_ERR, "config: Unbalanced ']' in \"%s\"", fmt);
 288                                         return 0;
 289                                 }
 290                                 if (from[1] != '.') {
 291                                         radlog(L_ERR, "config: Unexpected text after ']' in \"%s\"", fmt);
 292                                         return 0;
 293                                 }
 294
 295                                 flag--;
 296                                 *(to++) = *(from++);
 297                                 break;
 298
 299                         case '.':
 300                                 if (flag == 0) break;
 301                                 /* FALL-THROUGH */
 302
 303                         default:
 304                                 *(to++) = *(from++);
 305                                 break;
 306                         }
 307
 308                         if ((*from == '.') && (flag == 0)) {
 309                                 from++;
 310                                 break;
 311                         }
 312                 } /* end of string, or found a period */
 313
 314                 if (flag != 0) {
 315                         radlog(L_ERR, "config: Unbalanced '[' in \"%s\"", fmt);
 316                         return 0;
 317                 }
 318
 319                 *(to++) = '\0'; /* terminate the string. */
 320         }
 321
 322         /*
 323          *      Expand each string, as appropriate
 324          */
 325         to = argv_buf;
 326         left = sizeof(argv_buf);
 327         for (i = 0; i < argc; i++) {
 328                 int sublen;
 329
 330                 /*
 331                  *      Don't touch argv's which won't be translated.
 332                  */
 333                 if (strchr(argv[i], '%') == NULL) continue;
 334
 335                 sublen = radius_xlat(to, left - 1, argv[i], request, NULL);
 336                 if (sublen <= 0) {
 337                         /*
 338                          *      Fail to be backwards compatible.
 339                          *
 340                          *      It's yucky, but it won't break anything,
 341                          *      and it won't cause security problems.
 342                          */
 343                         sublen = 0;
 344                 }
 345
 346                 argv[i] = to;
 347                 to += sublen;
 348                 *(to++) = '\0';
 349                 left -= sublen;
 350                 left--;
 351
 352                 if (left <= 0) {
 353                         return 0;
 354                 }
 355         }
 356         argv[argc] = NULL;
 357
 358         cs = cf_section_find(NULL); /* get top-level section */
 359
 360         /*
 361          *      Root through section & subsection references.
 362          *      The last entry of argv MUST be the CONF_PAIR.
 363          */
 364         for (i = 0; i < argc - 1; i++) {
 365                 char *name2 = NULL;
 366                 CONF_SECTION *subcs;
 367
 368                 /*
 369                  *      FIXME: What about RADIUS attributes containing '['?
 370                  */
 371                 name2 = strchr(argv[i], '[');
 372                 if (name2) {
 373                         char *p = strchr(name2, ']');
 374                         rad_assert(p != NULL);
 375                         rad_assert(p[1] =='\0');
 376                         *p = '\0';
 377                         *name2 = '\0';
 378                         name2++;
 379                 }
 380
 381                 if (name2) {
 382                         subcs = cf_section_sub_find_name2(cs, argv[i],
 383                                                           name2);
 384                         if (!subcs) {
 385                           radlog(L_ERR, "config: section \"%s %s {}\" not found while dereferencing \"%s\"", argv[i], name2, fmt);
 386                           return 0;
 387                         }
 388                 } else {
 389                         subcs = cf_section_sub_find(cs, argv[i]);
 390                         if (!subcs) {
 391                           radlog(L_ERR, "config: section \"%s {}\" not found while dereferencing \"%s\"", argv[i], fmt);
 392                           return 0;
 393                         }
 394                 }
 395                 cs = subcs;
 396         } /* until argc - 1 */
 397
 398         /*
 399          *      This can now have embedded periods in it.
 400          */
 401         cp = cf_pair_find(cs, argv[argc - 1]);
 402         if (!cp) {
 403                 radlog(L_ERR, "config: item \"%s\" not found while dereferencing \"%s\"", argv[argc], fmt);
 404                 return 0;
 405         }
 406
 407         /*
 408          *  Ensure that we only copy what's necessary.
 409          *
 410          *  If 'outlen' is too small, then the output is chopped to fit.
 411          */
 412         value = cf_pair_value(cp);
 413         if (value) {
 414                 if (outlen > strlen(value)) {
 415                         outlen = strlen(value) + 1;
 416                 }
 417         }
 418
 419         return func(out, outlen, value);
 420 }
 421
 422
 423 /*
 424  *      Recursively make directories.
 425  */
 426 static int r_mkdir(const char *part)
 427 {
 428         char *ptr, parentdir[500];
 429         struct stat st;
 430
 431         if (stat(part, &st) == 0)
 432                 return(0);
 433
 434         ptr = strrchr(part, '/');
 435
 436         if (ptr == part)
 437                 return(0);
 438
 439         snprintf(parentdir, (ptr - part)+1, "%s", part);
 440
 441         if (r_mkdir(parentdir) != 0)
 442                 return(1);
 443
 444         if (mkdir(part, 0770) != 0) {
 445                 radlog(L_ERR, "mkdir(%s) error: %s\n", part, strerror(errno));
 446                 return(1);
 447         }
 448
 449         return(0);
 450 }
 451
 452 /*
 453  *      Checks if the log directory is writeable by a particular user.
 454  */
 455 static int radlogdir_iswritable(const char *effectiveuser)
 456 {
 457         struct passwd *pwent;
 458
 459         if (radlog_dir[0] != '/')
 460                 return(0);
 461
 462         if (r_mkdir(radlog_dir) != 0)
 463                 return(1);
 464
 465         /* FIXME: do we have this function? */
 466         if (strstr(radlog_dir, "radius") == NULL)
 467                 return(0);
 468
 469         /* we have a logdir that mentions 'radius', so it's probably
 470          * safe to chown the immediate directory to be owned by the normal
 471          * process owner. we gotta do it before we give up root.  -chad
 472          */
 473
 474         if (!effectiveuser) {
 475                 return 1;
 476         }
 477
 478         pwent = getpwnam(effectiveuser);
 479
 480         if (pwent == NULL) /* uh oh! */
 481                 return(1);
 482
 483         if (chown(radlog_dir, pwent->pw_uid, -1) != 0)
 484                 return(1);
 485
 486         return(0);
 487 }
 488
 489
 490 /*
 491  *  Switch UID and GID to what is specified in the config file
 492  */
 493 static int switch_users(void)
 494 {
 495         /*  Set GID.  */
 496         if (mainconfig.gid_name != NULL) {
 497                 struct group *gr;
 498
 499                 gr = getgrnam(mainconfig.gid_name);
 500                 if (gr == NULL) {
 501                         if (errno == ENOMEM) {
 502                                 radlog(L_ERR|L_CONS, "Cannot switch to Group %s: out of memory", mainconfig.gid_name);
 503                         } else {
 504                                 radlog(L_ERR|L_CONS, "Cannot switch group; %s doesn't exist", mainconfig.gid_name);
 505                         }
 506                         exit(1);
 507                 }
 508                 server_gid = gr->gr_gid;
 509                 if (setgid(server_gid) < 0) {
 510                         radlog(L_ERR|L_CONS, "Failed setting Group to %s: %s",
 511                                mainconfig.gid_name, strerror(errno));
 512                         exit(1);
 513                 }
 514         } else {
 515                 server_gid = getgid();
 516         }
 517
 518         /*  Set UID.  */
 519         if (mainconfig.uid_name != NULL) {
 520                 struct passwd *pw;
 521
 522                 pw = getpwnam(mainconfig.uid_name);
 523                 if (pw == NULL) {
 524                         if (errno == ENOMEM) {
 525                                 radlog(L_ERR|L_CONS, "Cannot switch to User %s: out of memory", mainconfig.uid_name);
 526                         } else {
 527                                 radlog(L_ERR|L_CONS, "Cannot switch user; %s doesn't exist", mainconfig.uid_name);
 528                         }
 529                         exit(1);
 530                 }
 531                 server_uid = pw->pw_uid;
 532 #ifdef HAVE_INITGROUPS
 533                 if (initgroups(mainconfig.uid_name, server_gid) < 0) {
 534                         if (errno != EPERM) {
 535                                 radlog(L_ERR|L_CONS, "Failed setting supplementary groups for User %s: %s", mainconfig.uid_name, strerror(errno));
 536                                 exit(1);
 537                         }
 538                 }
 539 #endif
 540                 if (setuid(server_uid) < 0) {
 541                         radlog(L_ERR|L_CONS, "Failed setting User to %s: %s", mainconfig.uid_name, strerror(errno));
 542                         exit(1);
 543                 }
 544         }
 545
 546         /*
 547          *      We've probably written to the log file already as
 548          *      root.root, so if we have switched users, we've got to
 549          *      update the ownership of the file.
 550          */
 551         if ((debug_flag == 0) &&
 552             (mainconfig.radlog_dest == RADLOG_FILES) &&
 553             (mainconfig.log_file != NULL)) {
 554                 chown(mainconfig.log_file, server_uid, server_gid);
 555         }
 556         return(0);
 557 }
 558
 559
 560 /*
 561  * Create the linked list of realms from the new configuration type
 562  * This way we don't have to change to much in the other source-files
 563  */
 564 static int generate_realms(const char *filename)
 565 {
 566         CONF_SECTION *cs;
 567         REALM *my_realms = NULL;
 568         REALM *c, **tail;
 569         char *s, *t, *authhost, *accthost;
 570         const char *name2;
 571
 572         tail = &my_realms;
 573         for (cs = cf_subsection_find_next(mainconfig.config, NULL, "realm");
 574              cs != NULL;
 575              cs = cf_subsection_find_next(mainconfig.config, cs, "realm")) {
 576                 name2 = cf_section_name2(cs);
 577                 if (!name2) {
 578                         radlog(L_CONS|L_ERR, "%s[%d]: Missing realm name",
 579                                filename, cf_section_lineno(cs));
 580                         return -1;
 581                 }
 582                 /*
 583                  * We've found a realm, allocate space for it
 584                  */
 585                 c = rad_malloc(sizeof(REALM));
 586                 memset(c, 0, sizeof(REALM));
 587
 588                 c->secret[0] = '\0';
 589
 590                 /*
 591                  *      No authhost means LOCAL.
 592                  */
 593                 if ((authhost = cf_section_value_find(cs, "authhost")) == NULL) {
 594                         c->ipaddr.af = AF_INET;
 595                         c->ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
 596                         c->auth_port = 0;
 597                 } else {
 598                         if ((s = strchr(authhost, ':')) != NULL) {
 599                                 *s++ = 0;
 600                                 c->auth_port = atoi(s);
 601                         } else {
 602                                 c->auth_port = PW_AUTH_UDP_PORT;
 603                         }
 604                         if (strcmp(authhost, "LOCAL") == 0) {
 605                                 /*
 606                                  *      Local realms don't have an IP address,
 607                                  *      secret, or port.
 608                                  */
 609                                 c->ipaddr.af = AF_INET;
 610                                 c->ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
 611                                 c->auth_port = 0;
 612                         } else {
 613                                 if (ip_hton(authhost, AF_INET,
 614                                             &c->ipaddr) < 0) {
 615                                         radlog(L_ERR, "%s[%d]: Host %s not found",
 616                                                filename, cf_section_lineno(cs),
 617                                                authhost);
 618                                         return -1;
 619                                 }
 620                         }
 621
 622                         /*
 623                          * Double check length, just to be sure!
 624                          */
 625                         if (strlen(authhost) >= sizeof(c->server)) {
 626                                 radlog(L_ERR, "%s[%d]: Server name of length %d is greater than allowed: %d",
 627                                        filename, cf_section_lineno(cs),
 628                                        (int) strlen(authhost),
 629                                        (int) sizeof(c->server) - 1);
 630                                 return -1;
 631                         }
 632                 }
 633
 634                 /*
 635                  *      No accthost means LOCAL
 636                  */
 637                 if ((accthost = cf_section_value_find(cs, "accthost")) == NULL) {
 638                         c->acct_ipaddr.af = AF_INET;
 639                         c->acct_ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
 640                         c->acct_port = 0;
 641                 } else {
 642                         if ((s = strchr(accthost, ':')) != NULL) {
 643                                 *s++ = 0;
 644                                 c->acct_port = atoi(s);
 645                         } else {
 646                                 c->acct_port = PW_ACCT_UDP_PORT;
 647                         }
 648                         if (strcmp(accthost, "LOCAL") == 0) {
 649                                 /*
 650                                  *      Local realms don't have an IP address,
 651                                  *      secret, or port.
 652                                  */
 653                                 c->acct_ipaddr.af = AF_INET;
 654                                 c->acct_ipaddr.ipaddr.ip4addr.s_addr = htonl(INADDR_NONE);
 655                                 c->acct_port = 0;
 656                         } else {
 657                                 if (ip_hton(accthost, AF_INET,
 658                                             &c->acct_ipaddr) < 0) {
 659                                         radlog(L_ERR, "%s[%d]: Host %s not found",
 660                                                filename, cf_section_lineno(cs),
 661                                                accthost);
 662                                         return -1;
 663                                 }
 664                         }
 665
 666                         if (strlen(accthost) >= sizeof(c->acct_server)) {
 667                                 radlog(L_ERR, "%s[%d]: Server name of length %d is greater than allowed: %d",
 668                                        filename, cf_section_lineno(cs),
 669                                        (int) strlen(accthost),
 670                                        (int) sizeof(c->acct_server) - 1);
 671                                 return -1;
 672                         }
 673                 }
 674
 675                 if (strlen(name2) >= sizeof(c->realm)) {
 676                         radlog(L_ERR, "%s[%d]: Realm name of length %d is greater than allowed %d",
 677                                filename, cf_section_lineno(cs),
 678                                (int) strlen(name2),
 679                                (int) sizeof(c->server) - 1);
 680                         return -1;
 681                 }
 682
 683                 strcpy(c->realm, name2);
 684                 if (authhost) strcpy(c->server, authhost);
 685                 if (accthost) strcpy(c->acct_server, accthost);
 686
 687                 /*
 688                  *      If one or the other of authentication/accounting
 689                  *      servers is set to LOCALHOST, then don't require
 690                  *      a shared secret.
 691                  */
 692                 rad_assert(c->ipaddr.af == AF_INET);
 693                 rad_assert(c->acct_ipaddr.af == AF_INET);
 694                 if ((c->ipaddr.ipaddr.ip4addr.s_addr != htonl(INADDR_NONE)) ||
 695                     (c->acct_ipaddr.ipaddr.ip4addr.s_addr != htonl(INADDR_NONE))) {
 696                         if ((s = cf_section_value_find(cs, "secret")) == NULL ) {
 697                                 radlog(L_ERR, "%s[%d]: No shared secret supplied for realm: %s",
 698                                        filename, cf_section_lineno(cs), name2);
 699                                 return -1;
 700                         }
 701
 702                         if (strlen(s) >= sizeof(c->secret)) {
 703                                 radlog(L_ERR, "%s[%d]: Secret of length %d is greater than the allowed maximum of %d.",
 704                                        filename, cf_section_lineno(cs),
 705                                        strlen(s), sizeof(c->secret) - 1);
 706                                 return -1;
 707                         }
 708                         strNcpy((char *)c->secret, s, sizeof(c->secret));
 709                 }
 710
 711                 c->striprealm = 1;
 712
 713                 if ((cf_section_value_find(cs, "nostrip")) != NULL)
 714                         c->striprealm = 0;
 715                 if ((cf_section_value_find(cs, "noacct")) != NULL)
 716                         c->acct_port = 0;
 717                 if ((cf_section_value_find(cs, "trusted")) != NULL)
 718                         c->trusted = 1;
 719                 if ((cf_section_value_find(cs, "notrealm")) != NULL)
 720                         c->notrealm = 1;
 721                 if ((cf_section_value_find(cs, "notsuffix")) != NULL)
 722                         c->notrealm = 1;
 723                 if ((t = cf_section_value_find(cs,"ldflag")) != NULL) {
 724                         static const LRAD_NAME_NUMBER ldflags[] = {
 725                                 { "fail_over",   0 },
 726                                 { "round_robin", 1 },
 727                                 { NULL, 0 }
 728                         };
 729
 730                         c->ldflag = lrad_str2int(ldflags, t, -1);
 731                         if (c->ldflag == -1) {
 732                                 radlog(L_ERR, "%s[%d]: Unknown value \"%s\" for ldflag",
 733                                        filename, cf_section_lineno(cs),
 734                                        t);
 735                                 return -1;
 736                         }
 737
 738                 } else {
 739                         c->ldflag = 0; /* non, make it fail-over */
 740                 }
 741                 c->active = TRUE;
 742                 c->acct_active = TRUE;
 743
 744                 c->next = NULL;
 745                 *tail = c;
 746                 tail = &c->next;
 747         }
 748
 749         /*
 750          *      And make these realms preferred over the ones
 751          *      in the 'realms' file.
 752          */
 753         *tail = mainconfig.realms;
 754         mainconfig.realms = my_realms;
 755
 756         /*
 757          *  Ensure that all of the flags agree for the realms.
 758          *
 759          *      Yeah, it's O(N^2), but it's only once, and the
 760          *      maximum number of realms is small.
 761          */
 762         for(c = mainconfig.realms; c != NULL; c = c->next) {
 763                 REALM *this;
 764
 765                 /*
 766                  *      Check that we cannot load balance to LOCAL
 767                  *      realms, as that doesn't make any sense.
 768                  */
 769                 rad_assert(c->ipaddr.af == AF_INET);
 770                 rad_assert(c->acct_ipaddr.af == AF_INET);
 771                 if ((c->ldflag == 1) &&
 772                     ((c->ipaddr.ipaddr.ip4addr.s_addr == htonl(INADDR_NONE)) ||
 773                      (c->acct_ipaddr.ipaddr.ip4addr.s_addr == htonl(INADDR_NONE)))) {
 774                         radlog(L_ERR | L_CONS, "ERROR: Realm %s cannot be load balanced to LOCAL",
 775                                c->realm);
 776                         exit(1);
 777                 }
 778
 779                 /*
 780                  *      Compare this realm to all others, to ensure
 781                  *      that the configuration is consistent.
 782                  */
 783                 for (this = c->next; this != NULL; this = this->next) {
 784                         if (strcasecmp(c->realm, this->realm) != 0) {
 785                                 continue;
 786                         }
 787
 788                         /*
 789                          *      Same realm: Different load balancing
 790                          *      flag: die.
 791                          */
 792                         if (c->ldflag != this->ldflag) {
 793                                 radlog(L_ERR | L_CONS, "ERROR: Inconsistent value in realm %s for load balancing 'ldflag' attribute",
 794                                        c->realm);
 795                                 exit(1);
 796                         }
 797                 }
 798         }
 799
 800         return 0;
 801 }
 802
 803
 804 static const LRAD_NAME_NUMBER str2dest[] = {
 805         { "files", RADLOG_FILES },
 806         { "syslog", RADLOG_SYSLOG },
 807         { "stdout", RADLOG_STDOUT },
 808         { "stderr", RADLOG_STDERR },
 809         { NULL, RADLOG_NULL }
 810 };
 811
 812
 813 /*
 814  *      Read config files.
 815  *
 816  *      This function can ONLY be called from the main server process.
 817  */
 818 int read_mainconfig(int reload)
 819 {
 820         struct rlimit core_limits;
 821         static int old_debug_level = -1;
 822         char buffer[1024];
 823         CONF_SECTION *cs, *oldcs, *newcs;
 824         rad_listen_t *listener;
 825
 826         if (!reload) {
 827                 radlog(L_INFO, "Starting - reading configuration files ...");
 828         } else {
 829                 radlog(L_INFO, "Reloading configuration files.");
 830         }
 831
 832         /* Initialize the dictionary */
 833         DEBUG2("read_config_files:  reading dictionary");
 834         if (dict_init(radius_dir, RADIUS_DICTIONARY) != 0) {
 835                 radlog(L_ERR|L_CONS, "Errors reading dictionary: %s",
 836                                 librad_errstr);
 837                 cf_section_free(&cs);
 838                 return -1;
 839         }
 840
 841         /* Read the configuration file */
 842         snprintf(buffer, sizeof(buffer), "%.200s/%.50s",
 843                  radius_dir, mainconfig.radiusd_conf);
 844         if ((cs = conf_read(NULL, 0, buffer, NULL)) == NULL) {
 845                 radlog(L_ERR|L_CONS, "Errors reading %s", buffer);
 846                 return -1;
 847         }
 848
 849         /*
 850          *      This allows us to figure out where, relative to
 851          *      radiusd.conf, the other configuration files exist.
 852          */
 853         cf_section_parse(cs, NULL, server_config);
 854
 855 #if 0
 856         /*
 857          *      Merge the old with the new.
 858          */
 859         if (reload) {
 860                 newcs = cf_section_sub_find(cs, "modules");
 861                 oldcs = cf_section_sub_find(mainconfig.config, "modules");
 862                 if (newcs && oldcs) {
 863                         if (!cf_section_migrate(newcs, oldcs)) {
 864                                 radlog(L_ERR|L_CONS, "Fatal error migrating configuration data");
 865                                 return -1;
 866                         }
 867                 }
 868         }
 869 #endif
 870
 871         /*
 872          *      Debug flag 1 MAY go to files.
 873          *      Debug flag 2 ALWAYS goes to stdout
 874          */
 875         if (debug_flag < 2) {
 876                 int rcode;
 877                 char *radlog_dest = NULL;
 878
 879                 rcode = cf_item_parse(cs, "log_destination",
 880                                       PW_TYPE_STRING_PTR, &radlog_dest,
 881                                       "files");
 882                 if (rcode < 0) return NULL;
 883
 884                 mainconfig.radlog_dest = lrad_str2int(str2dest, radlog_dest, RADLOG_NULL);
 885                 if (mainconfig.radlog_dest == RADLOG_NULL) {
 886                         fprintf(stderr, "radiusd: Error: Unknown log_destination %s\n",
 887                                 radlog_dest);
 888                         cf_section_free(&cs);
 889                         return NULL;
 890                 }
 891
 892                 if (mainconfig.radlog_dest == RADLOG_SYSLOG) {
 893                         mainconfig.syslog_facility = lrad_str2int(str2fac, syslog_facility, -1);
 894                         if (mainconfig.syslog_facility < 0) {
 895                                 fprintf(stderr, "radiusd: Error: Unknown syslog_facility %s\n",
 896                                         syslog_facility);
 897                                 cf_section_free(&cs);
 898                                 return NULL;
 899                         }
 900                 }
 901         }
 902
 903         /*
 904          *      Free the old configuration items, and replace them
 905          *      with the new ones.
 906          *
 907          *      Note that where possible, we do atomic switch-overs,
 908          *      to ensure that the pointers are always valid.
 909          */
 910         oldcs = mainconfig.config;
 911         mainconfig.config = cs;
 912         cf_section_free(&oldcs);
 913
 914         /*
 915          *      Old-style realms file.
 916          */
 917         snprintf(buffer, sizeof(buffer), "%.200s/%.50s", radius_dir, RADIUS_REALMS);
 918         DEBUG2("read_config_files:  reading realms");
 919         if (read_realms_file(buffer) < 0) {
 920                 radlog(L_ERR|L_CONS, "Errors reading realms");
 921                 return -1;
 922         }
 923
 924         /*
 925          *      If there isn't any realms it isn't fatal..
 926          */
 927         snprintf(buffer, sizeof(buffer), "%.200s/%.50s",
 928                  radius_dir, mainconfig.radiusd_conf);
 929         if (generate_realms(buffer) < 0) {
 930                 return -1;
 931         }
 932
 933         /*
 934          *  Register the %{config:section.subsection} xlat function.
 935          */
 936         xlat_register("config", xlat_config, NULL);
 937
 938         /*
 939          *      Set the libraries debugging flag to whatever the main
 940          *      flag is.  Note that on a SIGHUP, to turn the debugging
 941          *      off, we do other magic.
 942          *
 943          *      Increase the debug level, if the configuration file
 944          *      says to, OR, if we're decreasing the debug from what it
 945          *      was before, allow that, too.
 946          */
 947         if ((mainconfig.debug_level > debug_flag) ||
 948             (mainconfig.debug_level <= old_debug_level)) {
 949                 debug_flag = mainconfig.debug_level;
 950         }
 951         librad_debug = debug_flag;
 952         old_debug_level = mainconfig.debug_level;
 953
 954         /*
 955          *  Go update our behaviour, based on the configuration
 956          *  changes.
 957          */
 958
 959         /*  Get the current maximum for core files.  */
 960         if (getrlimit(RLIMIT_CORE, &core_limits) < 0) {
 961                 radlog(L_ERR|L_CONS, "Failed to get current core limit:  %s", strerror(errno));
 962                 exit(1);
 963         }
 964
 965         if (mainconfig.allow_core_dumps) {
 966                 if (setrlimit(RLIMIT_CORE, &core_limits) < 0) {
 967                         radlog(L_ERR|L_CONS, "Cannot update core dump limit: %s",
 968                                         strerror(errno));
 969                         exit(1);
 970
 971                         /*
 972                          *  If we're running as a daemon, and core
 973                          *  dumps are enabled, log that information.
 974                          */
 975                 } else if ((core_limits.rlim_cur != 0) && !debug_flag)
 976                         radlog(L_INFO|L_CONS, "Core dumps are enabled.");
 977
 978         } else if (!debug_flag) {
 979                 /*
 980                  *  Not debugging.  Set the core size to zero, to
 981                  *  prevent security breaches.  i.e. People
 982                  *  reading passwords from the 'core' file.
 983                  */
 984                 struct rlimit limits;
 985
 986                 limits.rlim_cur = 0;
 987                 limits.rlim_max = core_limits.rlim_max;
 988
 989                 if (setrlimit(RLIMIT_CORE, &limits) < 0) {
 990                         radlog(L_ERR|L_CONS, "Cannot disable core dumps: %s",
 991                                         strerror(errno));
 992                         exit(1);
 993                 }
 994         }
 995
 996         /*
 997          *      The first time around, ensure that we can write to the
 998          *      log directory.
 999          */
1000         if (!reload) {
1001                 /*
1002                  *      We need root to do mkdir() and chown(), so we
1003                  *      do this before giving up root.
1004                  */
1005                 radlogdir_iswritable(mainconfig.uid_name);
1006         }
1007
1008         /*
1009          *      We should really switch users earlier in the process.
1010          */
1011         switch_users();
1012
1013         /*
1014          *      Sanity check the configuration for internal
1015          *      consistency.
1016          */
1017         if (mainconfig.reject_delay > mainconfig.cleanup_delay) {
1018                 mainconfig.reject_delay = mainconfig.cleanup_delay;
1019         }
1020
1021         /*
1022          *      Initialize the old "bind_address" and "port", first.
1023          */
1024         listener = NULL;
1025
1026         /*
1027          *      Read the list of listeners.
1028          */
1029         snprintf(buffer, sizeof(buffer), "%.200s/%s", radius_dir, mainconfig.radiusd_conf);
1030         if (listen_init(buffer, &listener) < 0) {
1031                 exit(1);
1032         }
1033
1034         if (!listener) {
1035                 radlog(L_ERR|L_CONS, "Server is not configured to listen on any ports.  Exiting.");
1036                 exit(1);
1037         }
1038
1039         listen_free(&mainconfig.listen);
1040         mainconfig.listen = listener;
1041
1042         /*
1043          *      Walk through the listeners.  If we're listening on acct
1044          *      or auth, read in the clients files, else ignore them.
1045          */
1046         for (listener = mainconfig.listen;
1047              listener != NULL;
1048              listener = listener->next) {
1049                 if ((listener->type == RAD_LISTEN_AUTH) ||
1050                     (listener->type == RAD_LISTEN_ACCT)) {
1051                         break;
1052                 }
1053         }
1054
1055         if (listener != NULL) {
1056                 RADCLIENT_LIST *clients, *old_clients;
1057
1058                 /* old-style naslist file */
1059                 snprintf(buffer, sizeof(buffer), "%.200s/%.50s", radius_dir, RADIUS_NASLIST);
1060                 DEBUG2("read_config_files:  reading naslist");
1061                 if (read_naslist_file(buffer) < 0) {
1062                         radlog(L_ERR|L_CONS, "Errors reading naslist");
1063                         return -1;
1064                 }
1065
1066                 /*
1067                  *      Create the new clients first, and add them
1068                  *      to the CONF_SECTION, where they're automagically
1069                  *      freed if anything goes wrong.
1070                  */
1071                 snprintf(buffer, sizeof(buffer), "%.200s/%.50s",
1072                          radius_dir, mainconfig.radiusd_conf);
1073                 clients = clients_parse_section(buffer, mainconfig.config);
1074                 if (!clients) {
1075                         return -1;
1076                 }
1077
1078                 /*
1079                  *      Free the old trees AFTER replacing them with
1080                  *      the new ones...
1081                  */
1082                 old_clients = mainconfig.clients;
1083                 mainconfig.clients = clients;
1084         }
1085
1086         /*  Reload the modules.  */
1087         DEBUG2("radiusd:  entering modules setup");
1088         if (setup_modules(reload) < 0) {
1089                 radlog(L_ERR|L_CONS, "Errors setting up modules");
1090                 return -1;
1091         }
1092         return 0;
1093 }
1094
1095 /*
1096  *      Free the configuration.
1097  */
1098 int free_mainconfig(void)
1099 {
1100         /*
1101          *      Clean up the configuration data
1102          *      structures.
1103          */
1104         cf_section_free(&mainconfig.config);
1105         realm_free(mainconfig.realms);
1106         listen_free(&mainconfig.listen);
1107
1108         return 0;
1109 }