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/radius_snmp.h>
  30 #include <freeradius-devel/rad_assert.h>
  31
  32 #include <sys/stat.h>
  33
  34 #include <ctype.h>
  35 #include <fcntl.h>
  36
  37 struct radclient_list {
  38         /*
  39          *      FIXME: One set of trees for IPv4, and another for IPv6?
  40          */
  41         rbtree_t        *trees[129]; /* for 0..128, inclusive. */
  42         int             min_prefix;
  43 };
  44
  45
  46 #ifdef WITH_SNMP
  47 static rbtree_t         *tree_num;      /* client numbers 0..N */
  48 static int              tree_num_max;
  49 #endif
  50 static RADCLIENT_LIST   *root_clients;
  51
  52 /*
  53  *      Callback for freeing a client.
  54  */
  55 void client_free(RADCLIENT *client)
  56 {
  57         free(client->longname);
  58         free(client->secret);
  59         free(client->shortname);
  60         free(client->nastype);
  61         free(client->login);
  62         free(client->password);
  63
  64 #ifdef WITH_SNMP
  65         free(client->auth);
  66         free(client->acct);
  67 #endif
  68
  69         free(client);
  70 }
  71
  72
  73 /*
  74  *      Callback for comparing two clients.
  75  */
  76 static int client_ipaddr_cmp(const void *one, const void *two)
  77 {
  78         const RADCLIENT *a = one;
  79         const RADCLIENT *b = two;
  80
  81         return lrad_ipaddr_cmp(&a->ipaddr, &b->ipaddr);
  82 }
  83
  84 #ifdef WITH_SNMP
  85 static int client_num_cmp(const void *one, const void *two)
  86 {
  87         const RADCLIENT *a = one;
  88         const RADCLIENT *b = two;
  89
  90         return (a->number - b->number);
  91 }
  92 #endif
  93
  94 /*
  95  *      Free a RADCLIENT list.
  96  */
  97 void clients_free(RADCLIENT_LIST *clients)
  98 {
  99         int i;
 100
 101         if (!clients) return;
 102
 103         for (i = 0; i <= 128; i++) {
 104                 if (clients->trees[i]) rbtree_free(clients->trees[i]);
 105                 clients->trees[i] = NULL;
 106         }
 107
 108         if (clients == root_clients) {
 109 #ifdef WITH_SNMP
 110                 if (tree_num) rbtree_free(tree_num);
 111                 tree_num = NULL;
 112                 tree_num_max = 0;
 113 #endif
 114                 root_clients = NULL;
 115         }
 116
 117         free(clients);
 118 }
 119
 120 /*
 121  *      Return a new, initialized, set of clients.
 122  */
 123 RADCLIENT_LIST *clients_init(void)
 124 {
 125         RADCLIENT_LIST *clients = calloc(1, sizeof(RADCLIENT_LIST));
 126
 127         if (!clients) return NULL;
 128
 129         clients->min_prefix = 128;
 130
 131         return clients;
 132 }
 133
 134
 135 /*
 136  *      Sanity check a client.
 137  */
 138 static int client_sane(RADCLIENT *client)
 139 {
 140         switch (client->ipaddr.af) {
 141         case AF_INET:
 142                 if (client->prefix > 32) {
 143                         return 0;
 144                 }
 145
 146                 /*
 147                  *      Zero out the subnet bits.
 148                  */
 149                 if (client->prefix < 32) {
 150                         uint32_t mask = ~0;
 151
 152                         mask <<= (32 - client->prefix);
 153                         client->ipaddr.ipaddr.ip4addr.s_addr &= htonl(mask);
 154                 }
 155                 break;
 156
 157         case AF_INET6:
 158                 if (client->prefix > 128) return 0;
 159
 160                 if (client->prefix < 128) {
 161                         int i;
 162                         uint32_t mask, *addr;
 163
 164                         addr = (uint32_t *) &client->ipaddr.ipaddr.ip6addr;
 165
 166                         for (i = client->prefix; i < 128; i += 32) {
 167                                 mask = ~0;
 168                                 mask <<= ((128 - i) & 0x1f);
 169                                 addr[i / 32] &= mask;
 170                         }
 171                 }
 172                 break;
 173
 174         default:
 175                 return 0;
 176         }
 177
 178         return 1;
 179 }
 180
 181
 182 /*
 183  *      Add a client to the tree.
 184  */
 185 int client_add(RADCLIENT_LIST *clients, RADCLIENT *client)
 186 {
 187         if (!client) {
 188                 return 0;
 189         }
 190
 191         /*
 192          *      If "clients" is NULL, it means add to the global list.
 193          */
 194         if (!clients) {
 195                 /*
 196                  *      Initialize it, if not done already.
 197                  */
 198                 if (!root_clients) {
 199                         root_clients = clients_init();
 200                         if (!root_clients) return 0;
 201                         rad_assert(root_clients == NULL);
 202                 }
 203                 clients = root_clients;
 204         }
 205
 206         if ((client->prefix < 0) || (client->prefix > 128)) {
 207                 return 0;
 208         }
 209
 210         if (!client_sane(client)) return 0;
 211
 212         /*
 213          *      Create a tree for it.
 214          */
 215         if (!clients->trees[client->prefix]) {
 216                 clients->trees[client->prefix] = rbtree_create(client_ipaddr_cmp,
 217                                                                client_free, 0);
 218                 if (!clients->trees[client->prefix]) {
 219                         return 0;
 220                 }
 221         }
 222
 223         /*
 224          *      Duplicate?
 225          */
 226         if (!rbtree_insert(clients->trees[client->prefix], client)) {
 227                 return 0;
 228         }
 229
 230 #ifdef WITH_SNMP
 231         if (!tree_num) {
 232                 tree_num = rbtree_create(client_num_cmp, NULL, 0);
 233         }
 234
 235
 236         /*
 237          *      Catch clients added by rlm_sql.
 238          */
 239         if (!client->auth) {
 240                 client->auth = rad_malloc(sizeof(*client->auth));
 241                 memset(client->auth, 0, sizeof(*client->auth));
 242         }
 243
 244         if (!client->acct) {
 245                 client->acct = rad_malloc(sizeof(*client->acct));
 246                 memset(client->acct, 0, sizeof(*client->acct));
 247         }
 248
 249
 250         client->number = tree_num_max;
 251         tree_num_max++;
 252         if (tree_num) rbtree_insert(tree_num, client);
 253 #endif
 254
 255         if (client->prefix < clients->min_prefix) {
 256                 clients->min_prefix = client->prefix;
 257         }
 258
 259         return 1;
 260 }
 261
 262
 263 /*
 264  *      Find a client in the RADCLIENTS list by number.
 265  *      This is a support function for the SNMP code.
 266  */
 267 RADCLIENT *client_findbynumber(const RADCLIENT_LIST *clients,
 268                                int number)
 269 {
 270 #ifdef WITH_SNMP
 271         if (!clients) clients = root_clients;
 272
 273         if (!clients) return NULL;
 274
 275         if (number >= tree_num_max) return NULL;
 276
 277         if (tree_num) {
 278                 RADCLIENT myclient;
 279
 280                 myclient.number = number;
 281
 282                 return rbtree_finddata(tree_num, &myclient);
 283         }
 284 #else
 285         clients = clients;      /* -Wunused */
 286         number = number;        /* -Wunused */
 287 #endif
 288         return NULL;
 289 }
 290
 291
 292 /*
 293  *      Find a client in the RADCLIENTS list.
 294  */
 295 RADCLIENT *client_find(const RADCLIENT_LIST *clients,
 296                        const lrad_ipaddr_t *ipaddr)
 297 {
 298         int i, max_prefix;
 299         RADCLIENT myclient;
 300
 301         if (!clients) clients = root_clients;
 302
 303         if (!clients || !ipaddr) return NULL;
 304
 305         switch (ipaddr->af) {
 306         case AF_INET:
 307                 max_prefix = 32;
 308                 break;
 309
 310         case AF_INET6:
 311                 max_prefix = 128;
 312                 break;
 313
 314         default :
 315                 return NULL;
 316         }
 317
 318         for (i = max_prefix; i >= clients->min_prefix; i--) {
 319                 void *data;
 320
 321                 myclient.prefix = i;
 322                 myclient.ipaddr = *ipaddr;
 323                 client_sane(&myclient); /* clean up the ipaddress */
 324
 325                 if (!clients->trees[i]) continue;
 326
 327                 data = rbtree_finddata(clients->trees[i], &myclient);
 328                 if (data) {
 329                         return data;
 330                 }
 331         }
 332
 333         return NULL;
 334 }
 335
 336
 337 /*
 338  *      Old wrapper for client_find
 339  */
 340 RADCLIENT *client_find_old(const lrad_ipaddr_t *ipaddr)
 341 {
 342         return client_find(root_clients, ipaddr);
 343 }
 344
 345
 346 /*
 347  *      Find the name of a client (prefer short name).
 348  */
 349 const char *client_name(const RADCLIENT_LIST *clients,
 350                         const lrad_ipaddr_t *ipaddr)
 351 {
 352         /* We don't call this unless we should know about the client. */
 353         RADCLIENT *cl;
 354         char host_ipaddr[128];
 355
 356         if ((cl = client_find(clients, ipaddr)) != NULL) {
 357                 if (cl->shortname && cl->shortname[0])
 358                         return cl->shortname;
 359                 else
 360                         return cl->longname;
 361         }
 362
 363         /*
 364          * this isn't normally reachable, but if a loggable event happens just
 365          * after a client list change and a HUP, then we may not know this
 366          * information any more.
 367          *
 368          * If you see lots of these, then there's something wrong.
 369          */
 370         radlog(L_ERR, "Trying to look up name of unknown client %s.\n",
 371                ip_ntoh(ipaddr, host_ipaddr, sizeof(host_ipaddr)));
 372
 373         return "UNKNOWN-CLIENT";
 374 }
 375
 376 const char *client_name_old(const lrad_ipaddr_t *ipaddr)
 377 {
 378         return client_name(root_clients, ipaddr);
 379 }
 380
 381 static struct in_addr cl_ip4addr;
 382 static struct in6_addr cl_ip6addr;
 383
 384 static const CONF_PARSER client_config[] = {
 385         { "ipaddr",  PW_TYPE_IPADDR,
 386           0, &cl_ip4addr,  NULL },
 387         { "ipv6addr",  PW_TYPE_IPV6ADDR,
 388           0, &cl_ip6addr, NULL },
 389         { "netmask",  PW_TYPE_INTEGER,
 390           offsetof(RADCLIENT, prefix), 0, NULL },
 391
 392         { "secret",  PW_TYPE_STRING_PTR,
 393           offsetof(RADCLIENT, secret), 0, NULL },
 394         { "shortname",  PW_TYPE_STRING_PTR,
 395           offsetof(RADCLIENT, shortname), 0, NULL },
 396         { "nastype",  PW_TYPE_STRING_PTR,
 397           offsetof(RADCLIENT, nastype), 0, NULL },
 398         { "login",  PW_TYPE_STRING_PTR,
 399           offsetof(RADCLIENT, login), 0, NULL },
 400         { "password",  PW_TYPE_STRING_PTR,
 401           offsetof(RADCLIENT, password), 0, NULL },
 402         { "virtual_server",  PW_TYPE_STRING_PTR,
 403           offsetof(RADCLIENT, server), 0, NULL },
 404         { "server",  PW_TYPE_STRING_PTR, /* compatability with 2.0-pre */
 405           offsetof(RADCLIENT, server), 0, NULL },
 406
 407         { NULL, -1, 0, NULL, NULL }
 408 };
 409
 410
 411 /*
 412  *      Create the linked list of clients from the new configuration
 413  *      type.  This way we don't have to change too much in the other
 414  *      source-files.
 415  */
 416 RADCLIENT_LIST *clients_parse_section(CONF_SECTION *section)
 417 {
 418         CONF_SECTION    *cs, *parentcs;
 419         RADCLIENT       *c;
 420         const char      *name2;
 421         RADCLIENT_LIST  *clients;
 422
 423         /*
 424          *      Be forgiving.  If there's already a clients, return
 425          *      it.  Otherwise create a new one.
 426          */
 427         clients = cf_data_find(section, "clients");
 428         if (clients) return clients;
 429
 430         clients = clients_init();
 431         if (!clients) return NULL;
 432
 433         parentcs = cf_top_section(section);
 434
 435         /*
 436          *      Associate the clients structure with the section, where
 437          *      it will be freed once the section is freed.
 438          */
 439         if (cf_data_add(section, "clients", clients, clients_free) < 0) {
 440                 cf_log_err(cf_sectiontoitem(section),
 441                            "Failed to associate clients with section %s",
 442                        cf_section_name1(section));
 443                 clients_free(clients);
 444                 return NULL;
 445         }
 446
 447         for (cs = cf_subsection_find_next(section, NULL, "client");
 448              cs != NULL;
 449              cs = cf_subsection_find_next(section, cs, "client")) {
 450
 451                 name2 = cf_section_name2(cs);
 452                 if (!name2) {
 453                         cf_log_err(cf_sectiontoitem(cs),
 454                                    "Missing client name");
 455                         return NULL;
 456                 }
 457
 458                 /*
 459                  * The size is fine.. Let's create the buffer
 460                  */
 461                 c = rad_malloc(sizeof(*c));
 462                 memset(c, 0, sizeof(*c));
 463                 c->cs = cs;
 464
 465 #ifdef WITH_SNMP
 466                 c->auth = rad_malloc(sizeof(*c->auth));
 467                 memset(c->auth, 0, sizeof(*c->auth));
 468
 469                 c->acct = rad_malloc(sizeof(*c->acct));
 470                 memset(c->acct, 0, sizeof(*c->acct));
 471 #endif
 472
 473                 memset(&cl_ip4addr, 0, sizeof(cl_ip4addr));
 474                 memset(&cl_ip6addr, 0, sizeof(cl_ip6addr));
 475                 c->prefix = -1;
 476
 477                 if (cf_section_parse(cs, c, client_config) < 0) {
 478                         client_free(c);
 479                         cf_log_err(cf_sectiontoitem(cs),
 480                                    "Error parsing client section.");
 481                         return NULL;
 482                 }
 483
 484                 /*
 485                  *      Global clients can set servers to use,
 486                  *      per-server clients cannot.
 487                  */
 488                 if ((section != parentcs) && c->server) {
 489                         client_free(c);
 490                         cf_log_err(cf_sectiontoitem(cs),
 491                                    "Clients inside of an server section cannot point to another server.");
 492                         return NULL;
 493                 }
 494
 495                 /*
 496                  *      No "ipaddr" or "ipv6addr", use old-style
 497                  *      "client <ipaddr> {" syntax.
 498                  */
 499                 if (!cf_pair_find(cs, "ipaddr") &&
 500                     !cf_pair_find(cs, "ipv6addr")) {
 501                         char *prefix_ptr;
 502
 503                         prefix_ptr = strchr(name2, '/');
 504
 505                         /*
 506                          *      Look for prefixes.
 507                          */
 508                         if (prefix_ptr) {
 509                                 c->prefix = atoi(prefix_ptr + 1);
 510                                 if ((c->prefix < 0) || (c->prefix > 128)) {
 511                                         client_free(c);
 512                                         cf_log_err(cf_sectiontoitem(cs),
 513                                                    "Invalid Prefix value '%s' for IP.",
 514                                                    prefix_ptr + 1);
 515                                         return NULL;
 516                                 }
 517                                 /* Replace '/' with '\0' */
 518                                 *prefix_ptr = '\0';
 519                         }
 520
 521                         /*
 522                          *      Always get the numeric representation of IP
 523                          */
 524                         if (ip_hton(name2, AF_UNSPEC, &c->ipaddr) < 0) {
 525                                 client_free(c);
 526                                 cf_log_err(cf_sectiontoitem(cs),
 527                                            "Failed to look up hostname %s: %s",
 528                                            name2, librad_errstr);
 529                                 return NULL;
 530                         }
 531
 532                         if (prefix_ptr) *prefix_ptr = '/';
 533                         c->longname = strdup(name2);
 534
 535                         if (!c->shortname) c->shortname = strdup(c->longname);
 536
 537                 } else {
 538                         char buffer[1024];
 539
 540                         /*
 541                          *      Figure out which one to use.
 542                          */
 543                         if (cf_pair_find(cs, "ipaddr")) {
 544                                 c->ipaddr.af = AF_INET;
 545                                 c->ipaddr.ipaddr.ip4addr = cl_ip4addr;
 546
 547                                 if ((c->prefix < -1) || (c->prefix > 32)) {
 548                                         client_free(c);
 549                                         cf_log_err(cf_sectiontoitem(cs),
 550                                                    "Netmask must be between 0 and 32");
 551                                         return NULL;
 552                                 }
 553
 554                         } else if (cf_pair_find(cs, "ipv6addr")) {
 555                                 c->ipaddr.af = AF_INET6;
 556                                 c->ipaddr.ipaddr.ip6addr = cl_ip6addr;
 557
 558                                 if ((c->prefix < -1) || (c->prefix > 128)) {
 559                                         client_free(c);
 560                                         cf_log_err(cf_sectiontoitem(cs),
 561                                                    "Netmask must be between 0 and 128");
 562                                         return NULL;
 563                                 }
 564                         } else {
 565                                 client_free(c); /* a fairly bad error */
 566                                 return NULL;
 567                         }
 568
 569                         ip_ntoh(&c->ipaddr, buffer, sizeof(buffer));
 570                         c->longname = strdup(buffer);
 571
 572                         /*
 573                          *      Set the short name to the name2
 574                          */
 575                         if (!c->shortname) c->shortname = strdup(name2);
 576                 }
 577
 578                 if (c->prefix < 0) switch (c->ipaddr.af) {
 579                 case AF_INET:
 580                         c->prefix = 32;
 581                         break;
 582                 case AF_INET6:
 583                         c->prefix = 128;
 584                         break;
 585                 default:
 586                         break;
 587                 }
 588
 589                 /*
 590                  *      FIXME: Add the client as data via cf_data_add,
 591                  *      for migration issues.
 592                  */
 593
 594                 if (!client_add(clients, c)) {
 595                         cf_log_err(cf_sectiontoitem(cs),
 596                                    "Failed to add client %s", name2);
 597                         client_free(c);
 598                         return NULL;
 599                 }
 600         }
 601
 602         /*
 603          *      Replace the global list of clients with the new one.
 604          *      The old one is still referenced from the original
 605          *      configuration, and will be freed when that is freed.
 606          */
 607         if (section == parentcs) {
 608                 root_clients = clients;
 609         }
 610
 611         return clients;
 612 }