src/main/client.c

   1 /*
   2  * client.c     Read clients into memory.
   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Copyright 2000,2006  The FreeRADIUS server project
  21  * Copyright 2000  Miquel van Smoorenburg <miquels@cistron.nl>
  22  * Copyright 2000  Alan DeKok <aland@ox.org>
  23  */
  24
  25 #include <freeradius-devel/ident.h>
  26 RCSID("$Id$")
  27
  28 #include <freeradius-devel/radiusd.h>
  29 #include <freeradius-devel/rad_assert.h>
  30
  31 #include <sys/stat.h>
  32
  33 #include <ctype.h>
  34 #include <fcntl.h>
  35
  36 #ifdef WITH_DYNAMIC_CLIENTS
  37 #ifdef HAVE_DIRENT_H
  38 #include <dirent.h>
  39 #endif
  40 #endif
  41
  42 struct radclient_list {
  43         /*
  44          *      FIXME: One set of trees for IPv4, and another for IPv6?
  45          */
  46         rbtree_t        *trees[129]; /* for 0..128, inclusive. */
  47         int             min_prefix;
  48 };
  49
  50
  51 #ifdef WITH_STATS
  52 static rbtree_t         *tree_num = NULL;     /* client numbers 0..N */
  53 static int              tree_num_max = 0;
  54 #endif
  55 static RADCLIENT_LIST   *root_clients = NULL;
  56
  57 #ifdef WITH_DYNAMIC_CLIENTS
  58 static fr_fifo_t        *deleted_clients = NULL;
  59 #endif
  60
  61 /*
  62  *      Callback for freeing a client.
  63  */
  64 void client_free(RADCLIENT *client)
  65 {
  66 #ifdef WITH_DYNAMIC_CLIENTS
  67         if (client->dynamic == 2) {
  68                 time_t now;
  69
  70                 if (!deleted_clients) {
  71                         deleted_clients = fr_fifo_create(1024,
  72                                                          (void *) client_free);
  73                         if (!deleted_clients) return; /* MEMLEAK */
  74                 }
  75
  76                 /*
  77                  *      Mark it as in the fifo, and remember when we
  78                  *      pushed it.
  79                  */
  80                 client->dynamic = 3;
  81                 client->created = now = time(NULL); /* re-set it */
  82                 fr_fifo_push(deleted_clients, client);
  83
  84                 /*
  85                  *      Peek at the head of the fifo.  If it might
  86                  *      still be in use, return.  Otherwise, pop it
  87                  *      from the queue and delete it.
  88                  */
  89                 client = fr_fifo_peek(deleted_clients);
  90                 if ((client->created + 120) >= now) return;
  91
  92                 client = fr_fifo_pop(deleted_clients);
  93                 rad_assert(client != NULL);
  94         }
  95 #endif
  96
  97         free(client->longname);
  98         free(client->secret);
  99         free(client->shortname);
 100         free(client->nastype);
 101         free(client->login);
 102         free(client->password);
 103         free(client->server);
 104
 105 #ifdef WITH_STATS
 106         free(client->auth);
 107 #ifdef WITH_ACCOUNTING
 108         free(client->acct);
 109 #endif
 110 #endif
 111
 112 #ifdef WITH_DYNAMIC_CLIENTS
 113         free(client->client_server);
 114 #endif
 115
 116         free(client);
 117 }
 118
 119 /*
 120  *      Callback for comparing two clients.
 121  */
 122 static int client_ipaddr_cmp(const void *one, const void *two)
 123 {
 124         const RADCLIENT *a = one;
 125         const RADCLIENT *b = two;
 126
 127         return fr_ipaddr_cmp(&a->ipaddr, &b->ipaddr);
 128 }
 129
 130 #ifdef WITH_STATS
 131 static int client_num_cmp(const void *one, const void *two)
 132 {
 133         const RADCLIENT *a = one;
 134         const RADCLIENT *b = two;
 135
 136         return (a->number - b->number);
 137 }
 138 #endif
 139
 140 /*
 141  *      Free a RADCLIENT list.
 142  */
 143 void clients_free(RADCLIENT_LIST *clients)
 144 {
 145         int i;
 146
 147         if (!clients) return;
 148
 149         for (i = 0; i <= 128; i++) {
 150                 if (clients->trees[i]) rbtree_free(clients->trees[i]);
 151                 clients->trees[i] = NULL;
 152         }
 153
 154         if (clients == root_clients) {
 155 #ifdef WITH_STATS
 156                 if (tree_num) rbtree_free(tree_num);
 157                 tree_num = NULL;
 158                 tree_num_max = 0;
 159 #endif
 160                 root_clients = NULL;
 161         }
 162
 163 #ifdef WITH_DYNAMIC_CLIENTS
 164         /*
 165          *      FIXME: No fr_fifo_delete()
 166          */
 167 #endif
 168
 169         free(clients);
 170 }
 171
 172 /*
 173  *      Return a new, initialized, set of clients.
 174  */
 175 RADCLIENT_LIST *clients_init(void)
 176 {
 177         RADCLIENT_LIST *clients = calloc(1, sizeof(RADCLIENT_LIST));
 178
 179         if (!clients) return NULL;
 180
 181         clients->min_prefix = 128;
 182
 183         return clients;
 184 }
 185
 186
 187 /*
 188  *      Sanity check a client.
 189  */
 190 static int client_sane(RADCLIENT *client)
 191 {
 192         switch (client->ipaddr.af) {
 193         case AF_INET:
 194                 if (client->prefix > 32) {
 195                         return 0;
 196                 }
 197
 198                 /*
 199                  *      Zero out the subnet bits.
 200                  */
 201                 if (client->prefix == 0) {
 202                         memset(&client->ipaddr.ipaddr.ip4addr, 0,
 203                                sizeof(client->ipaddr.ipaddr.ip4addr));
 204
 205                 } else if (client->prefix < 32) {
 206                         uint32_t mask = ~0;
 207
 208                         mask <<= (32 - client->prefix);
 209                         client->ipaddr.ipaddr.ip4addr.s_addr &= htonl(mask);
 210                 }
 211                 break;
 212
 213         case AF_INET6:
 214                 if (client->prefix > 128) return 0;
 215
 216                 if (client->prefix == 0) {
 217                         memset(&client->ipaddr.ipaddr.ip6addr, 0,
 218                                sizeof(client->ipaddr.ipaddr.ip6addr));
 219
 220                 } else if (client->prefix < 128) {
 221                         int i;
 222                         uint32_t mask, *addr;
 223
 224                         addr = (uint32_t *) &client->ipaddr.ipaddr.ip6addr;
 225
 226                         for (i = client->prefix; i < 128; i += 32) {
 227                                 mask = ~0;
 228                                 mask <<= ((128 - i) & 0x1f);
 229                                 addr[i / 32] &= mask;
 230                         }
 231                 }
 232                 break;
 233
 234         default:
 235                 return 0;
 236         }
 237
 238         return 1;
 239 }
 240
 241
 242 /*
 243  *      Add a client to the tree.
 244  */
 245 int client_add(RADCLIENT_LIST *clients, RADCLIENT *client)
 246 {
 247         RADCLIENT *old;
 248
 249         if (!client) {
 250                 return 0;
 251         }
 252
 253         /*
 254          *      If "clients" is NULL, it means add to the global list.
 255          */
 256         if (!clients) {
 257                 /*
 258                  *      Initialize it, if not done already.
 259                  */
 260                 if (!root_clients) {
 261                         root_clients = clients_init();
 262                         if (!root_clients) return 0;
 263                 }
 264                 clients = root_clients;
 265         }
 266
 267         if ((client->prefix < 0) || (client->prefix > 128)) {
 268                 return 0;
 269         }
 270
 271         if (!client_sane(client)) return 0;
 272
 273         /*
 274          *      Create a tree for it.
 275          */
 276         if (!clients->trees[client->prefix]) {
 277                 clients->trees[client->prefix] = rbtree_create(client_ipaddr_cmp,
 278                                                                (void *) client_free, 0);
 279                 if (!clients->trees[client->prefix]) {
 280                         return 0;
 281                 }
 282         }
 283
 284 #define namecmp(a) ((!old->a && !client->a) || (old->a && client->a && (strcmp(old->a, client->a) == 0)))
 285
 286         /*
 287          *      Cannot insert the same client twice.
 288          */
 289         old = rbtree_finddata(clients->trees[client->prefix], client);
 290         if (old) {
 291                 /*
 292                  *      If it's a complete duplicate, then free the new
 293                  *      one, and return "OK".
 294                  */
 295                 if ((fr_ipaddr_cmp(&old->ipaddr, &client->ipaddr) == 0) &&
 296                     (old->prefix == client->prefix) &&
 297                     namecmp(longname) && namecmp(secret) &&
 298                     namecmp(shortname) && namecmp(nastype) &&
 299                     namecmp(login) && namecmp(password) && namecmp(server) &&
 300 #ifdef WITH_DYNAMIC_CLIENTS
 301                     (old->lifetime == client->lifetime) &&
 302                     namecmp(client_server) &&
 303 #endif
 304 #ifdef WITH_COA
 305                     namecmp(coa_name) &&
 306                     (old->coa_server == client->coa_server) &&
 307                     (old->coa_pool == client->coa_pool) &&
 308 #endif
 309                     (old->message_authenticator == client->message_authenticator)) {
 310                         DEBUG("WARNING: Ignoring duplicate client %s", client->longname);
 311                         client_free(client);
 312                         return 1;
 313                 }
 314
 315                 radlog(L_ERR, "Failed to add duplicate client %s",
 316                        client->shortname);
 317                 return 0;
 318         }
 319 #undef namecmp
 320
 321         /*
 322          *      Other error adding client: likely is fatal.
 323          */
 324         if (!rbtree_insert(clients->trees[client->prefix], client)) {
 325                 return 0;
 326         }
 327
 328 #ifdef WITH_STATS
 329         if (!tree_num) {
 330                 tree_num = rbtree_create(client_num_cmp, NULL, 0);
 331         }
 332
 333
 334         /*
 335          *      Catch clients added by rlm_sql.
 336          */
 337         if (!client->auth) {
 338                 client->auth = rad_malloc(sizeof(*client->auth));
 339                 memset(client->auth, 0, sizeof(*client->auth));
 340         }
 341
 342 #ifdef WITH_ACCOUNTING
 343         if (!client->acct) {
 344                 client->acct = rad_malloc(sizeof(*client->acct));
 345                 memset(client->acct, 0, sizeof(*client->acct));
 346         }
 347 #endif
 348
 349 #ifdef WITH_DYNAMIC_CLIENTS
 350         /*
 351          *      More catching of clients added by rlm_sql.
 352          *
 353          *      The sql modules sets the dynamic flag BEFORE calling
 354          *      us.  The client_create() function sets it AFTER
 355          *      calling us.
 356          */
 357         if (client->dynamic && (client->lifetime == 0)) {
 358                 RADCLIENT *network;
 359
 360                 /*
 361                  *      If there IS an enclosing network,
 362                  *      inherit the lifetime from it.
 363                  */
 364                 network = client_find(clients, &client->ipaddr);
 365                 if (network) {
 366                         client->lifetime = network->lifetime;
 367                 }
 368         }
 369 #endif
 370
 371         client->number = tree_num_max;
 372         tree_num_max++;
 373         if (tree_num) rbtree_insert(tree_num, client);
 374 #endif
 375
 376         if (client->prefix < clients->min_prefix) {
 377                 clients->min_prefix = client->prefix;
 378         }
 379
 380         return 1;
 381 }
 382
 383
 384 #ifdef WITH_DYNAMIC_CLIENTS
 385 void client_delete(RADCLIENT_LIST *clients, RADCLIENT *client)
 386 {
 387         if (!clients || !client) return;
 388
 389         rad_assert((client->prefix >= 0) && (client->prefix <= 128));
 390
 391         client->dynamic = 2;    /* signal to client_free */
 392
 393         rbtree_deletebydata(tree_num, client);
 394         rbtree_deletebydata(clients->trees[client->prefix], client);
 395 }
 396 #endif
 397
 398
 399 /*
 400  *      Find a client in the RADCLIENTS list by number.
 401  *      This is a support function for the statistics code.
 402  */
 403 RADCLIENT *client_findbynumber(const RADCLIENT_LIST *clients,
 404                                int number)
 405 {
 406 #ifdef WITH_STATS
 407         if (!clients) clients = root_clients;
 408
 409         if (!clients) return NULL;
 410
 411         if (number >= tree_num_max) return NULL;
 412
 413         if (tree_num) {
 414                 RADCLIENT myclient;
 415
 416                 myclient.number = number;
 417
 418                 return rbtree_finddata(tree_num, &myclient);
 419         }
 420 #else
 421         clients = clients;      /* -Wunused */
 422         number = number;        /* -Wunused */
 423 #endif
 424         return NULL;
 425 }
 426
 427
 428 /*
 429  *      Find a client in the RADCLIENTS list.
 430  */
 431 RADCLIENT *client_find(const RADCLIENT_LIST *clients,
 432                        const fr_ipaddr_t *ipaddr)
 433 {
 434         int i, max_prefix;
 435         RADCLIENT myclient;
 436
 437         if (!clients) clients = root_clients;
 438
 439         if (!clients || !ipaddr) return NULL;
 440
 441         switch (ipaddr->af) {
 442         case AF_INET:
 443                 max_prefix = 32;
 444                 break;
 445
 446         case AF_INET6:
 447                 max_prefix = 128;
 448                 break;
 449
 450         default :
 451                 return NULL;
 452         }
 453
 454         for (i = max_prefix; i >= clients->min_prefix; i--) {
 455                 void *data;
 456
 457                 myclient.prefix = i;
 458                 myclient.ipaddr = *ipaddr;
 459                 client_sane(&myclient); /* clean up the ipaddress */
 460
 461                 if (!clients->trees[i]) continue;
 462
 463                 data = rbtree_finddata(clients->trees[i], &myclient);
 464                 if (data) {
 465                         return data;
 466                 }
 467         }
 468
 469         return NULL;
 470 }
 471
 472
 473 /*
 474  *      Old wrapper for client_find
 475  */
 476 RADCLIENT *client_find_old(const fr_ipaddr_t *ipaddr)
 477 {
 478         return client_find(root_clients, ipaddr);
 479 }
 480
 481 static struct in_addr cl_ip4addr;
 482 static struct in6_addr cl_ip6addr;
 483
 484 static const CONF_PARSER client_config[] = {
 485         { "ipaddr",  PW_TYPE_IPADDR,
 486           0, &cl_ip4addr,  NULL },
 487         { "ipv6addr",  PW_TYPE_IPV6ADDR,
 488           0, &cl_ip6addr, NULL },
 489         { "netmask",  PW_TYPE_INTEGER,
 490           offsetof(RADCLIENT, prefix), 0, NULL },
 491
 492         { "require_message_authenticator",  PW_TYPE_BOOLEAN,
 493           offsetof(RADCLIENT, message_authenticator), 0, "no" },
 494
 495         { "secret",  PW_TYPE_STRING_PTR,
 496           offsetof(RADCLIENT, secret), 0, NULL },
 497         { "shortname",  PW_TYPE_STRING_PTR,
 498           offsetof(RADCLIENT, shortname), 0, NULL },
 499         { "nastype",  PW_TYPE_STRING_PTR,
 500           offsetof(RADCLIENT, nastype), 0, NULL },
 501         { "login",  PW_TYPE_STRING_PTR,
 502           offsetof(RADCLIENT, login), 0, NULL },
 503         { "password",  PW_TYPE_STRING_PTR,
 504           offsetof(RADCLIENT, password), 0, NULL },
 505         { "virtual_server",  PW_TYPE_STRING_PTR,
 506           offsetof(RADCLIENT, server), 0, NULL },
 507         { "server",  PW_TYPE_STRING_PTR, /* compatability with 2.0-pre */
 508           offsetof(RADCLIENT, server), 0, NULL },
 509
 510 #ifdef WITH_DYNAMIC_CLIENTS
 511         { "dynamic_clients",  PW_TYPE_STRING_PTR,
 512           offsetof(RADCLIENT, client_server), 0, NULL },
 513         { "lifetime",  PW_TYPE_INTEGER,
 514           offsetof(RADCLIENT, lifetime), 0, NULL },
 515 #endif
 516
 517 #ifdef WITH_COA
 518         { "coa_server",  PW_TYPE_STRING_PTR,
 519           offsetof(RADCLIENT, coa_name), 0, NULL },
 520 #endif
 521
 522         { NULL, -1, 0, NULL, NULL }
 523 };
 524
 525
 526 static RADCLIENT *client_parse(CONF_SECTION *cs, int in_server)
 527 {
 528         RADCLIENT       *c;
 529         const char      *name2;
 530
 531         name2 = cf_section_name2(cs);
 532         if (!name2) {
 533                 cf_log_err(cf_sectiontoitem(cs),
 534                            "Missing client name");
 535                 return NULL;
 536         }
 537
 538         /*
 539          * The size is fine.. Let's create the buffer
 540          */
 541         c = rad_malloc(sizeof(*c));
 542         memset(c, 0, sizeof(*c));
 543         c->cs = cs;
 544
 545 #ifdef WITH_STATS
 546         c->auth = rad_malloc(sizeof(*c->auth));
 547         memset(c->auth, 0, sizeof(*c->auth));
 548
 549 #ifdef WITH_ACCOUNTING
 550         c->acct = rad_malloc(sizeof(*c->acct));
 551         memset(c->acct, 0, sizeof(*c->acct));
 552 #endif
 553 #endif
 554
 555         memset(&cl_ip4addr, 0, sizeof(cl_ip4addr));
 556         memset(&cl_ip6addr, 0, sizeof(cl_ip6addr));
 557         c->prefix = -1;
 558
 559         if (cf_section_parse(cs, c, client_config) < 0) {
 560                 client_free(c);
 561                 cf_log_err(cf_sectiontoitem(cs),
 562                            "Error parsing client section.");
 563                 return NULL;
 564         }
 565
 566         /*
 567          *      Global clients can set servers to use,
 568          *      per-server clients cannot.
 569          */
 570         if (in_server && c->server) {
 571                 client_free(c);
 572                 cf_log_err(cf_sectiontoitem(cs),
 573                            "Clients inside of an server section cannot point to a server.");
 574                 return NULL;
 575         }
 576
 577         /*
 578          *      No "ipaddr" or "ipv6addr", use old-style
 579          *      "client <ipaddr> {" syntax.
 580          */
 581         if (!cf_pair_find(cs, "ipaddr") &&
 582             !cf_pair_find(cs, "ipv6addr")) {
 583                 char *prefix_ptr;
 584
 585                 prefix_ptr = strchr(name2, '/');
 586
 587                 /*
 588                  *      Look for prefixes.
 589                  */
 590                 if (prefix_ptr) {
 591                         c->prefix = atoi(prefix_ptr + 1);
 592                         if ((c->prefix < 0) || (c->prefix > 128)) {
 593                                 client_free(c);
 594                                 cf_log_err(cf_sectiontoitem(cs),
 595                                            "Invalid Prefix value '%s' for IP.",
 596                                            prefix_ptr + 1);
 597                                 return NULL;
 598                         }
 599                         /* Replace '/' with '\0' */
 600                         *prefix_ptr = '\0';
 601                 }
 602
 603                 /*
 604                  *      Always get the numeric representation of IP
 605                  */
 606                 if (ip_hton(name2, AF_UNSPEC, &c->ipaddr) < 0) {
 607                         client_free(c);
 608                         cf_log_err(cf_sectiontoitem(cs),
 609                                    "Failed to look up hostname %s: %s",
 610                                    name2, fr_strerror());
 611                         return NULL;
 612                 }
 613
 614                 if (prefix_ptr) *prefix_ptr = '/';
 615                 c->longname = strdup(name2);
 616
 617                 if (!c->shortname) c->shortname = strdup(c->longname);
 618
 619         } else {
 620                 char buffer[1024];
 621
 622                 /*
 623                  *      Figure out which one to use.
 624                  */
 625                 if (cf_pair_find(cs, "ipaddr")) {
 626                         c->ipaddr.af = AF_INET;
 627                         c->ipaddr.ipaddr.ip4addr = cl_ip4addr;
 628
 629                         if ((c->prefix < -1) || (c->prefix > 32)) {
 630                                 client_free(c);
 631                                 cf_log_err(cf_sectiontoitem(cs),
 632                                            "Netmask must be between 0 and 32");
 633                                 return NULL;
 634                         }
 635
 636                 } else if (cf_pair_find(cs, "ipv6addr")) {
 637                         c->ipaddr.af = AF_INET6;
 638                         c->ipaddr.ipaddr.ip6addr = cl_ip6addr;
 639
 640                         if ((c->prefix < -1) || (c->prefix > 128)) {
 641                                 client_free(c);
 642                                 cf_log_err(cf_sectiontoitem(cs),
 643                                            "Netmask must be between 0 and 128");
 644                                 return NULL;
 645                         }
 646                 } else {
 647                         cf_log_err(cf_sectiontoitem(cs),
 648                                    "No IP address defined for the client");
 649                         client_free(c);
 650                         return NULL;
 651                 }
 652
 653                 ip_ntoh(&c->ipaddr, buffer, sizeof(buffer));
 654                 c->longname = strdup(buffer);
 655
 656                 /*
 657                  *      Set the short name to the name2
 658                  */
 659                 if (!c->shortname) c->shortname = strdup(name2);
 660         }
 661
 662         if (c->prefix < 0) switch (c->ipaddr.af) {
 663         case AF_INET:
 664                 c->prefix = 32;
 665                 break;
 666         case AF_INET6:
 667                 c->prefix = 128;
 668                 break;
 669         default:
 670                 break;
 671         }
 672
 673 #ifdef WITH_DYNAMIC_CLIENTS
 674         if (c->client_server) {
 675                 free(c->secret);
 676                 c->secret = strdup("testing123");
 677
 678                 if (((c->ipaddr.af == AF_INET) &&
 679                      (c->prefix == 32)) ||
 680                     ((c->ipaddr.af == AF_INET6) &&
 681                      (c->prefix == 128))) {
 682                         cf_log_err(cf_sectiontoitem(cs),
 683                                    "Dynamic clients MUST be a network, not a single IP address.");
 684                         client_free(c);
 685                         return NULL;
 686                 }
 687
 688                 return c;
 689         }
 690 #endif
 691
 692         if (!c->secret || !*c->secret) {
 693 #ifdef WITH_DHCP
 694                 const char *value = NULL;
 695                 CONF_PAIR *cp = cf_pair_find(cs, "dhcp");
 696
 697                 if (cp) value = cf_pair_value(cp);
 698
 699                 /*
 700                  *      Secrets aren't needed for DHCP.
 701                  */
 702                 if (value && (strcmp(value, "yes") == 0)) return c;
 703
 704 #endif
 705                 client_free(c);
 706                 cf_log_err(cf_sectiontoitem(cs),
 707                            "secret must be at least 1 character long");
 708                 return NULL;
 709         }
 710
 711 #ifdef WITH_COA
 712         /*
 713          *      Point the client to the home server pool, OR to the
 714          *      home server.  This gets around the problem of figuring
 715          *      out which port to use.
 716          */
 717         if (c->coa_name) {
 718                 c->coa_pool = home_pool_byname(c->coa_name, HOME_TYPE_COA);
 719                 if (!c->coa_pool) {
 720                         c->coa_server = home_server_byname(c->coa_name);
 721                 }
 722                 if (!c->coa_server) {
 723                         client_free(c);
 724                         cf_log_err(cf_sectiontoitem(cs), "No such home_server or home_server_pool \"%s\"", c->coa_name);
 725                         return NULL;
 726                 }
 727         }
 728 #endif
 729
 730         return c;
 731 }
 732
 733
 734 /*
 735  *      Create the linked list of clients from the new configuration
 736  *      type.  This way we don't have to change too much in the other
 737  *      source-files.
 738  */
 739 RADCLIENT_LIST *clients_parse_section(CONF_SECTION *section)
 740 {
 741         int             global = FALSE, in_server = FALSE;
 742         CONF_SECTION    *cs;
 743         RADCLIENT       *c;
 744         RADCLIENT_LIST  *clients;
 745
 746         /*
 747          *      Be forgiving.  If there's already a clients, return
 748          *      it.  Otherwise create a new one.
 749          */
 750         clients = cf_data_find(section, "clients");
 751         if (clients) return clients;
 752
 753         clients = clients_init();
 754         if (!clients) return NULL;
 755
 756         if (cf_top_section(section) == section) global = TRUE;
 757
 758         if (strcmp("server", cf_section_name1(section)) == 0) in_server = TRUE;
 759
 760         /*
 761          *      Associate the clients structure with the section, where
 762          *      it will be freed once the section is freed.
 763          */
 764         if (cf_data_add(section, "clients", clients, (void *) clients_free) < 0) {
 765                 cf_log_err(cf_sectiontoitem(section),
 766                            "Failed to associate clients with section %s",
 767                        cf_section_name1(section));
 768                 clients_free(clients);
 769                 return NULL;
 770         }
 771
 772         for (cs = cf_subsection_find_next(section, NULL, "client");
 773              cs != NULL;
 774              cs = cf_subsection_find_next(section, cs, "client")) {
 775                 c = client_parse(cs, in_server);
 776                 if (!c) {
 777                         return NULL;
 778                 }
 779
 780                 /*
 781                  *      FIXME: Add the client as data via cf_data_add,
 782                  *      for migration issues.
 783                  */
 784
 785 #ifdef WITH_DYNAMIC_CLIENTS
 786 #ifdef HAVE_DIRENT_H
 787                 if (c->client_server) {
 788                         const char *value;
 789                         CONF_PAIR *cp;
 790                         DIR             *dir;
 791                         struct dirent   *dp;
 792                         struct stat stat_buf;
 793                         char buf2[2048];
 794
 795                         /*
 796                          *      Find the directory where individual
 797                          *      client definitions are stored.
 798                          */
 799                         cp = cf_pair_find(cs, "directory");
 800                         if (!cp) goto add_client;
 801
 802                         value = cf_pair_value(cp);
 803                         if (!value) {
 804                                 cf_log_err(cf_sectiontoitem(cs),
 805                                            "The \"directory\" entry must not be empty");
 806                                 client_free(c);
 807                                 return NULL;
 808                         }
 809
 810                         DEBUG("including dynamic clients in %s", value);
 811
 812                         dir = opendir(value);
 813                         if (!dir) {
 814                                 cf_log_err(cf_sectiontoitem(cs), "Error reading directory %s: %s", value, strerror(errno));
 815                                 client_free(c);
 816                                 return NULL;
 817                         }
 818
 819                         /*
 820                          *      Read the directory, ignoring "." files.
 821                          */
 822                         while ((dp = readdir(dir)) != NULL) {
 823                                 const char *p;
 824                                 RADCLIENT *dc;
 825
 826                                 if (dp->d_name[0] == '.') continue;
 827
 828                                 /*
 829                                  *      Check for valid characters
 830                                  */
 831                                 for (p = dp->d_name; *p != '\0'; p++) {
 832                                         if (isalpha((int)*p) ||
 833                                             isdigit((int)*p) ||
 834                                             (*p == ':') ||
 835                                             (*p == '.')) continue;
 836                                                 break;
 837                                 }
 838                                 if (*p != '\0') continue;
 839
 840                                 snprintf(buf2, sizeof(buf2), "%s/%s",
 841                                          value, dp->d_name);
 842
 843                                 if ((stat(buf2, &stat_buf) != 0) ||
 844                                     S_ISDIR(stat_buf.st_mode)) continue;
 845
 846                                 dc = client_read(buf2, in_server, TRUE);
 847                                 if (!dc) {
 848                                         cf_log_err(cf_sectiontoitem(cs),
 849                                                    "Failed reading client file \"%s\"", buf2);
 850                                         client_free(c);
 851                                         return NULL;
 852                                 }
 853
 854                                 /*
 855                                  *      Validate, and add to the list.
 856                                  */
 857                                 if (!client_validate(clients, c, dc)) {
 858
 859                                         client_free(c);
 860                                         return NULL;
 861                                 }
 862                         } /* loop over the directory */
 863                 }
 864 #endif /* HAVE_DIRENT_H */
 865 #endif /* WITH_DYNAMIC_CLIENTS */
 866
 867         add_client:
 868                 if (!client_add(clients, c)) {
 869                         cf_log_err(cf_sectiontoitem(cs),
 870                                    "Failed to add client %s",
 871                                    cf_section_name2(cs));
 872                         client_free(c);
 873                         return NULL;
 874                 }
 875
 876         }
 877
 878         /*
 879          *      Replace the global list of clients with the new one.
 880          *      The old one is still referenced from the original
 881          *      configuration, and will be freed when that is freed.
 882          */
 883         if (global) {
 884                 root_clients = clients;
 885         }
 886
 887         return clients;
 888 }
 889
 890 #ifdef WITH_DYNAMIC_CLIENTS
 891 /*
 892  *      We overload this structure a lot.
 893  */
 894 static const CONF_PARSER dynamic_config[] = {
 895         { "FreeRADIUS-Client-IP-Address",  PW_TYPE_IPADDR,
 896           offsetof(RADCLIENT, ipaddr), 0, NULL },
 897         { "FreeRADIUS-Client-IPv6-Address",  PW_TYPE_IPV6ADDR,
 898           offsetof(RADCLIENT, ipaddr), 0, NULL },
 899
 900         { "FreeRADIUS-Client-Require-MA",  PW_TYPE_BOOLEAN,
 901           offsetof(RADCLIENT, message_authenticator), NULL, NULL },
 902
 903         { "FreeRADIUS-Client-Secret",  PW_TYPE_STRING_PTR,
 904           offsetof(RADCLIENT, secret), 0, "" },
 905         { "FreeRADIUS-Client-Shortname",  PW_TYPE_STRING_PTR,
 906           offsetof(RADCLIENT, shortname), 0, "" },
 907         { "FreeRADIUS-Client-NAS-Type",  PW_TYPE_STRING_PTR,
 908           offsetof(RADCLIENT, nastype), 0, NULL },
 909         { "FreeRADIUS-Client-Virtual-Server",  PW_TYPE_STRING_PTR,
 910           offsetof(RADCLIENT, server), 0, NULL },
 911
 912         { NULL, -1, 0, NULL, NULL }
 913 };
 914
 915
 916 int client_validate(RADCLIENT_LIST *clients, RADCLIENT *master, RADCLIENT *c)
 917 {
 918         char buffer[128];
 919
 920         /*
 921          *      No virtual server defined.  Inherit the parent's
 922          *      definition.
 923          */
 924         if (master->server && !c->server) {
 925                 c->server = strdup(master->server);
 926         }
 927
 928         /*
 929          *      If the client network isn't global (not tied to a
 930          *      virtual server), then ensure that this clients server
 931          *      is the same as the enclosing networks virtual server.
 932          */
 933         if (master->server &&
 934              (strcmp(master->server, c->server) != 0)) {
 935                 DEBUG("- Cannot add client %s: Virtual server %s is not the same as the virtual server for the network.",
 936                       ip_ntoh(&c->ipaddr,
 937                               buffer, sizeof(buffer)),
 938                       c->server);
 939
 940                 goto error;
 941         }
 942
 943         if (!client_add(clients, c)) {
 944                 DEBUG("- Cannot add client %s: Internal error",
 945                       ip_ntoh(&c->ipaddr,
 946                               buffer, sizeof(buffer)));
 947
 948                 goto error;
 949         }
 950
 951         /*
 952          *      Initialize the remaining fields.
 953          */
 954         c->dynamic = TRUE;
 955         c->lifetime = master->lifetime;
 956         c->created = time(NULL);
 957         c->longname = strdup(c->shortname);
 958
 959         DEBUG("- Added client %s with shared secret %s",
 960               ip_ntoh(&c->ipaddr, buffer, sizeof(buffer)),
 961               c->secret);
 962
 963         return 1;
 964
 965  error:
 966         client_free(c);
 967         return 0;
 968 }
 969
 970
 971 RADCLIENT *client_create(RADCLIENT_LIST *clients, REQUEST *request)
 972 {
 973         int i, *pi;
 974         char **p;
 975         RADCLIENT *c;
 976         char buffer[128];
 977
 978         if (!clients || !request) return NULL;
 979
 980         c = rad_malloc(sizeof(*c));
 981         memset(c, 0, sizeof(*c));
 982         c->cs = request->client->cs;
 983         c->ipaddr.af = AF_UNSPEC;
 984
 985         for (i = 0; dynamic_config[i].name != NULL; i++) {
 986                 DICT_ATTR *da;
 987                 VALUE_PAIR *vp;
 988
 989                 da = dict_attrbyname(dynamic_config[i].name);
 990                 if (!da) {
 991                         DEBUG("- Cannot add client %s: attribute \"%s\"is not in the dictionary",
 992                               ip_ntoh(&request->packet->src_ipaddr,
 993                                       buffer, sizeof(buffer)),
 994                               dynamic_config[i].name);
 995                 error:
 996                         client_free(c);
 997                         return NULL;
 998                 }
 999
1000                 vp = pairfind(request->config_items, da->attr);
1001                 if (!vp) {
1002                         /*
1003                          *      Not required.  Skip it.
1004                          */
1005                         if (!dynamic_config[i].dflt) continue;
1006
1007                         DEBUG("- Cannot add client %s: Required attribute \"%s\" is missing.",
1008                               ip_ntoh(&request->packet->src_ipaddr,
1009                                       buffer, sizeof(buffer)),
1010                               dynamic_config[i].name);
1011                         goto error;
1012                 }
1013
1014                 switch (dynamic_config[i].type) {
1015                 case PW_TYPE_IPADDR:
1016                         c->ipaddr.af = AF_INET;
1017                         c->ipaddr.ipaddr.ip4addr.s_addr = vp->vp_ipaddr;
1018                         c->prefix = 32;
1019                         break;
1020
1021                 case PW_TYPE_IPV6ADDR:
1022                         c->ipaddr.af = AF_INET6;
1023                         c->ipaddr.ipaddr.ip6addr = vp->vp_ipv6addr;
1024                         c->prefix = 128;
1025                         break;
1026
1027                 case PW_TYPE_STRING_PTR:
1028                         p = (char **) ((char *) c + dynamic_config[i].offset);
1029                         if (*p) free(*p);
1030                         *p = strdup(vp->vp_strvalue);
1031                         break;
1032
1033                 case PW_TYPE_BOOLEAN:
1034                         pi = (int *) ((char *) c + dynamic_config[i].offset);
1035                         *pi = vp->vp_integer;
1036                         break;
1037
1038                 default:
1039                         goto error;
1040                 }
1041         }
1042
1043         if (c->ipaddr.af == AF_UNSPEC) {
1044                 DEBUG("- Cannot add client %s: No IP address was specified.",
1045                       ip_ntoh(&request->packet->src_ipaddr,
1046                               buffer, sizeof(buffer)));
1047
1048                 goto error;
1049         }
1050
1051         if (fr_ipaddr_cmp(&request->packet->src_ipaddr, &c->ipaddr) != 0) {
1052                 char buf2[128];
1053
1054                 DEBUG("- Cannot add client %s: IP address %s do not match",
1055                       ip_ntoh(&request->packet->src_ipaddr,
1056                               buffer, sizeof(buffer)),
1057                       ip_ntoh(&c->ipaddr,
1058                               buf2, sizeof(buf2)));
1059                 goto error;
1060         }
1061
1062         if (!client_validate(clients, request->client, c)) {
1063                 return NULL;
1064         }
1065
1066         return c;
1067 }
1068
1069 /*
1070  *      Read a client definition from the given filename.
1071  */
1072 RADCLIENT *client_read(const char *filename, int in_server, int flag)
1073 {
1074         const char *p;
1075         RADCLIENT *c;
1076         CONF_SECTION *cs;
1077         char buffer[256];
1078
1079         if (!filename) return NULL;
1080
1081         cs = cf_file_read(filename);
1082         if (!cs) return NULL;
1083
1084         c = client_parse(cf_section_sub_find(cs, "client"), in_server);
1085
1086         p = strrchr(filename, FR_DIR_SEP);
1087         if (p) {
1088                 p++;
1089         } else {
1090                 p = filename;
1091         }
1092
1093         if (!flag) return c;
1094
1095         /*
1096          *      Additional validations
1097          */
1098         ip_ntoh(&c->ipaddr, buffer, sizeof(buffer));
1099         if (strcmp(p, buffer) != 0) {
1100                 DEBUG("Invalid client definition in %s: IP address %s does not match name %s", filename, buffer, p);
1101                 client_free(c);
1102                 return NULL;
1103         }
1104
1105
1106
1107         return c;
1108 }
1109 #endif