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 fr_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                 }
 202                 clients = root_clients;
 203         }
 204
 205         if ((client->prefix < 0) || (client->prefix > 128)) {
 206                 return 0;
 207         }
 208
 209         if (!client_sane(client)) return 0;
 210
 211         /*
 212          *      Create a tree for it.
 213          */
 214         if (!clients->trees[client->prefix]) {
 215                 clients->trees[client->prefix] = rbtree_create(client_ipaddr_cmp,
 216                                                                (void *) client_free, 0);
 217                 if (!clients->trees[client->prefix]) {
 218                         return 0;
 219                 }
 220         }
 221
 222         /*
 223          *      Cannot insert the same client twice.
 224          */
 225         if (rbtree_find(clients->trees[client->prefix], client)) {
 226                 radlog(L_ERR, "Failed to add duplicate client %s",
 227                        client->shortname);
 228                 return 0;
 229         }
 230
 231         /*
 232          *      Other error adding client: likely is fatal.
 233          */
 234         if (!rbtree_insert(clients->trees[client->prefix], client)) {
 235                 return 0;
 236         }
 237
 238 #ifdef WITH_SNMP
 239         if (!tree_num) {
 240                 tree_num = rbtree_create(client_num_cmp, NULL, 0);
 241         }
 242
 243
 244         /*
 245          *      Catch clients added by rlm_sql.
 246          */
 247         if (!client->auth) {
 248                 client->auth = rad_malloc(sizeof(*client->auth));
 249                 memset(client->auth, 0, sizeof(*client->auth));
 250         }
 251
 252         if (!client->acct) {
 253                 client->acct = rad_malloc(sizeof(*client->acct));
 254                 memset(client->acct, 0, sizeof(*client->acct));
 255         }
 256
 257
 258         client->number = tree_num_max;
 259         tree_num_max++;
 260         if (tree_num) rbtree_insert(tree_num, client);
 261 #endif
 262
 263         if (client->prefix < clients->min_prefix) {
 264                 clients->min_prefix = client->prefix;
 265         }
 266
 267         return 1;
 268 }
 269
 270
 271 /*
 272  *      Find a client in the RADCLIENTS list by number.
 273  *      This is a support function for the SNMP code.
 274  */
 275 RADCLIENT *client_findbynumber(const RADCLIENT_LIST *clients,
 276                                int number)
 277 {
 278 #ifdef WITH_SNMP
 279         if (!clients) clients = root_clients;
 280
 281         if (!clients) return NULL;
 282
 283         if (number >= tree_num_max) return NULL;
 284
 285         if (tree_num) {
 286                 RADCLIENT myclient;
 287
 288                 myclient.number = number;
 289
 290                 return rbtree_finddata(tree_num, &myclient);
 291         }
 292 #else
 293         clients = clients;      /* -Wunused */
 294         number = number;        /* -Wunused */
 295 #endif
 296         return NULL;
 297 }
 298
 299
 300 /*
 301  *      Find a client in the RADCLIENTS list.
 302  */
 303 RADCLIENT *client_find(const RADCLIENT_LIST *clients,
 304                        const fr_ipaddr_t *ipaddr)
 305 {
 306         int i, max_prefix;
 307         RADCLIENT myclient;
 308
 309         if (!clients) clients = root_clients;
 310
 311         if (!clients || !ipaddr) return NULL;
 312
 313         switch (ipaddr->af) {
 314         case AF_INET:
 315                 max_prefix = 32;
 316                 break;
 317
 318         case AF_INET6:
 319                 max_prefix = 128;
 320                 break;
 321
 322         default :
 323                 return NULL;
 324         }
 325
 326         for (i = max_prefix; i >= clients->min_prefix; i--) {
 327                 void *data;
 328
 329                 myclient.prefix = i;
 330                 myclient.ipaddr = *ipaddr;
 331                 client_sane(&myclient); /* clean up the ipaddress */
 332
 333                 if (!clients->trees[i]) continue;
 334
 335                 data = rbtree_finddata(clients->trees[i], &myclient);
 336                 if (data) {
 337                         return data;
 338                 }
 339         }
 340
 341         return NULL;
 342 }
 343
 344
 345 /*
 346  *      Old wrapper for client_find
 347  */
 348 RADCLIENT *client_find_old(const fr_ipaddr_t *ipaddr)
 349 {
 350         return client_find(root_clients, ipaddr);
 351 }
 352
 353 static struct in_addr cl_ip4addr;
 354 static struct in6_addr cl_ip6addr;
 355
 356 static const CONF_PARSER client_config[] = {
 357         { "ipaddr",  PW_TYPE_IPADDR,
 358           0, &cl_ip4addr,  NULL },
 359         { "ipv6addr",  PW_TYPE_IPV6ADDR,
 360           0, &cl_ip6addr, NULL },
 361         { "netmask",  PW_TYPE_INTEGER,
 362           offsetof(RADCLIENT, prefix), 0, NULL },
 363
 364         { "require_message_authenticator",  PW_TYPE_BOOLEAN,
 365           offsetof(RADCLIENT, message_authenticator), 0, "no" },
 366
 367         { "secret",  PW_TYPE_STRING_PTR,
 368           offsetof(RADCLIENT, secret), 0, NULL },
 369         { "shortname",  PW_TYPE_STRING_PTR,
 370           offsetof(RADCLIENT, shortname), 0, NULL },
 371         { "nastype",  PW_TYPE_STRING_PTR,
 372           offsetof(RADCLIENT, nastype), 0, NULL },
 373         { "login",  PW_TYPE_STRING_PTR,
 374           offsetof(RADCLIENT, login), 0, NULL },
 375         { "password",  PW_TYPE_STRING_PTR,
 376           offsetof(RADCLIENT, password), 0, NULL },
 377         { "virtual_server",  PW_TYPE_STRING_PTR,
 378           offsetof(RADCLIENT, server), 0, NULL },
 379         { "server",  PW_TYPE_STRING_PTR, /* compatability with 2.0-pre */
 380           offsetof(RADCLIENT, server), 0, NULL },
 381
 382         { NULL, -1, 0, NULL, NULL }
 383 };
 384
 385
 386 static RADCLIENT *client_parse(CONF_SECTION *cs, int in_server)
 387 {
 388         RADCLIENT       *c;
 389         const char      *name2;
 390
 391         name2 = cf_section_name2(cs);
 392         if (!name2) {
 393                 cf_log_err(cf_sectiontoitem(cs),
 394                            "Missing client name");
 395                 return NULL;
 396         }
 397
 398         /*
 399          * The size is fine.. Let's create the buffer
 400          */
 401         c = rad_malloc(sizeof(*c));
 402         memset(c, 0, sizeof(*c));
 403         c->cs = cs;
 404
 405 #ifdef WITH_SNMP
 406         c->auth = rad_malloc(sizeof(*c->auth));
 407         memset(c->auth, 0, sizeof(*c->auth));
 408
 409         c->acct = rad_malloc(sizeof(*c->acct));
 410         memset(c->acct, 0, sizeof(*c->acct));
 411 #endif
 412
 413         memset(&cl_ip4addr, 0, sizeof(cl_ip4addr));
 414         memset(&cl_ip6addr, 0, sizeof(cl_ip6addr));
 415         c->prefix = -1;
 416
 417         if (cf_section_parse(cs, c, client_config) < 0) {
 418                 client_free(c);
 419                 cf_log_err(cf_sectiontoitem(cs),
 420                            "Error parsing client section.");
 421                 return NULL;
 422         }
 423
 424         /*
 425          *      Global clients can set servers to use,
 426          *      per-server clients cannot.
 427          */
 428         if (in_server && c->server) {
 429                 client_free(c);
 430                 cf_log_err(cf_sectiontoitem(cs),
 431                            "Clients inside of an server section cannot point to a server.");
 432                 return NULL;
 433         }
 434
 435         /*
 436          *      No "ipaddr" or "ipv6addr", use old-style
 437          *      "client <ipaddr> {" syntax.
 438          */
 439         if (!cf_pair_find(cs, "ipaddr") &&
 440             !cf_pair_find(cs, "ipv6addr")) {
 441                 char *prefix_ptr;
 442
 443                 prefix_ptr = strchr(name2, '/');
 444
 445                 /*
 446                  *      Look for prefixes.
 447                  */
 448                 if (prefix_ptr) {
 449                         c->prefix = atoi(prefix_ptr + 1);
 450                         if ((c->prefix < 0) || (c->prefix > 128)) {
 451                                 client_free(c);
 452                                 cf_log_err(cf_sectiontoitem(cs),
 453                                            "Invalid Prefix value '%s' for IP.",
 454                                            prefix_ptr + 1);
 455                                 return NULL;
 456                         }
 457                         /* Replace '/' with '\0' */
 458                         *prefix_ptr = '\0';
 459                 }
 460
 461                 /*
 462                  *      Always get the numeric representation of IP
 463                  */
 464                 if (ip_hton(name2, AF_UNSPEC, &c->ipaddr) < 0) {
 465                         client_free(c);
 466                         cf_log_err(cf_sectiontoitem(cs),
 467                                    "Failed to look up hostname %s: %s",
 468                                    name2, librad_errstr);
 469                         return NULL;
 470                 }
 471
 472                 if (prefix_ptr) *prefix_ptr = '/';
 473                 c->longname = strdup(name2);
 474
 475                 if (!c->shortname) c->shortname = strdup(c->longname);
 476
 477         } else {
 478                 char buffer[1024];
 479
 480                 /*
 481                  *      Figure out which one to use.
 482                  */
 483                 if (cf_pair_find(cs, "ipaddr")) {
 484                         c->ipaddr.af = AF_INET;
 485                         c->ipaddr.ipaddr.ip4addr = cl_ip4addr;
 486
 487                         if ((c->prefix < -1) || (c->prefix > 32)) {
 488                                 client_free(c);
 489                                 cf_log_err(cf_sectiontoitem(cs),
 490                                            "Netmask must be between 0 and 32");
 491                                 return NULL;
 492                         }
 493
 494                 } else if (cf_pair_find(cs, "ipv6addr")) {
 495                         c->ipaddr.af = AF_INET6;
 496                         c->ipaddr.ipaddr.ip6addr = cl_ip6addr;
 497
 498                         if ((c->prefix < -1) || (c->prefix > 128)) {
 499                                 client_free(c);
 500                                 cf_log_err(cf_sectiontoitem(cs),
 501                                            "Netmask must be between 0 and 128");
 502                                 return NULL;
 503                         }
 504                 } else {
 505                         cf_log_err(cf_sectiontoitem(cs),
 506                                    "No IP address defined for the client");
 507                         client_free(c);
 508                         return NULL;
 509                 }
 510
 511                 ip_ntoh(&c->ipaddr, buffer, sizeof(buffer));
 512                 c->longname = strdup(buffer);
 513
 514                 /*
 515                  *      Set the short name to the name2
 516                  */
 517                 if (!c->shortname) c->shortname = strdup(name2);
 518         }
 519
 520         if (c->prefix < 0) switch (c->ipaddr.af) {
 521         case AF_INET:
 522                 c->prefix = 32;
 523                 break;
 524         case AF_INET6:
 525                 c->prefix = 128;
 526                 break;
 527         default:
 528                 break;
 529         }
 530
 531         if (!c->secret || !*c->secret) {
 532                 client_free(c);
 533                 cf_log_err(cf_sectiontoitem(cs),
 534                            "secret must be at least 1 character long");
 535                 return NULL;
 536         }
 537
 538
 539         return c;
 540 }
 541
 542 /*
 543  *      Create the linked list of clients from the new configuration
 544  *      type.  This way we don't have to change too much in the other
 545  *      source-files.
 546  */
 547 RADCLIENT_LIST *clients_parse_section(CONF_SECTION *section)
 548 {
 549         int             global = FALSE, in_server = FALSE;
 550         CONF_SECTION    *cs;
 551         RADCLIENT       *c;
 552         RADCLIENT_LIST  *clients;
 553
 554         /*
 555          *      Be forgiving.  If there's already a clients, return
 556          *      it.  Otherwise create a new one.
 557          */
 558         clients = cf_data_find(section, "clients");
 559         if (clients) return clients;
 560
 561         clients = clients_init();
 562         if (!clients) return NULL;
 563
 564         if (cf_top_section(section) == section) global = TRUE;
 565
 566         if (strcmp("server", cf_section_name1(section)) == 0) in_server = TRUE;
 567
 568         /*
 569          *      Associate the clients structure with the section, where
 570          *      it will be freed once the section is freed.
 571          */
 572         if (cf_data_add(section, "clients", clients, (void *) clients_free) < 0) {
 573                 cf_log_err(cf_sectiontoitem(section),
 574                            "Failed to associate clients with section %s",
 575                        cf_section_name1(section));
 576                 clients_free(clients);
 577                 return NULL;
 578         }
 579
 580         for (cs = cf_subsection_find_next(section, NULL, "client");
 581              cs != NULL;
 582              cs = cf_subsection_find_next(section, cs, "client")) {
 583                 c = client_parse(cs, in_server);
 584                 if (!c) {
 585                         return NULL;
 586                 }
 587
 588                 /*
 589                  *      FIXME: Add the client as data via cf_data_add,
 590                  *      for migration issues.
 591                  */
 592
 593                 if (!client_add(clients, c)) {
 594                         cf_log_err(cf_sectiontoitem(cs),
 595                                    "Failed to add client %s",
 596                                    cf_section_name2(cs));
 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 (global) {
 608                 root_clients = clients;
 609         }
 610
 611         return clients;
 612 }