src/main/modules.c

   1 /*
   2  * modules.c    Radius module support.
   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 2003,2006  The FreeRADIUS server project
  21  * Copyright 2000  Alan DeKok <aland@ox.org>
  22  * Copyright 2000  Alan Curry <pacman@world.std.com>
  23  */
  24
  25 #include <freeradius-devel/ident.h>
  26 RCSID("$Id$")
  27
  28 #include <freeradius-devel/radiusd.h>
  29 #include <freeradius-devel/modpriv.h>
  30 #include <freeradius-devel/modcall.h>
  31 #include <freeradius-devel/rad_assert.h>
  32
  33 extern int check_config;
  34
  35 typedef struct indexed_modcallable {
  36         int             comp;
  37         int             idx;
  38         modcallable     *modulelist;
  39 } indexed_modcallable;
  40
  41 typedef struct virtual_server_t {
  42         const char      *name;
  43         CONF_SECTION    *cs;
  44         rbtree_t        *components;
  45         struct virtual_server_t *next;
  46 } virtual_server_t;
  47
  48 /*
  49  *      Keep a hash of virtual servers, so that we can reload them.
  50  */
  51 #define VIRTUAL_SERVER_HASH_SIZE (256)
  52 static virtual_server_t *virtual_servers[VIRTUAL_SERVER_HASH_SIZE];
  53
  54 static rbtree_t *module_tree = NULL;
  55
  56 static rbtree_t *instance_tree = NULL;
  57
  58 typedef struct section_type_value_t {
  59         const char      *section;
  60         const char      *typename;
  61         int             attr;
  62 } section_type_value_t;
  63
  64 struct fr_module_hup_t {
  65         module_instance_t       *mi;
  66         time_t                  when;
  67         void                    *insthandle;
  68         fr_module_hup_t         *next;
  69 };
  70
  71
  72 /*
  73  *      Ordered by component
  74  */
  75 static const section_type_value_t section_type_value[RLM_COMPONENT_COUNT] = {
  76         { "authenticate", "Auth-Type",       PW_AUTH_TYPE },
  77         { "authorize",    "Autz-Type",       PW_AUTZ_TYPE },
  78         { "preacct",      "Pre-Acct-Type",   PW_PRE_ACCT_TYPE },
  79         { "accounting",   "Acct-Type",       PW_ACCT_TYPE },
  80         { "session",      "Session-Type",    PW_SESSION_TYPE },
  81         { "pre-proxy",    "Pre-Proxy-Type",  PW_PRE_PROXY_TYPE },
  82         { "post-proxy",   "Post-Proxy-Type", PW_POST_PROXY_TYPE },
  83         { "post-auth",    "Post-Auth-Type",  PW_POST_AUTH_TYPE },
  84 };
  85
  86
  87 #ifdef WITHOUT_LIBLTDL
  88 typedef struct lt_dlmodule_t {
  89   const char    *name;
  90   void          *ref;
  91 } lt_dlmodule_t;
  92
  93 /*
  94  *      Define modules here.
  95  */
  96 extern module_t rlm_pap;
  97 extern module_t rlm_chap;
  98 extern module_t rlm_eap;
  99
 100 /*
 101  *      EAP structures are defined elsewhere.
 102  */
 103 typedef struct eap_type_t EAP_TYPE;
 104
 105 /*
 106  *      And so on for other EAP types.
 107  */
 108 extern EAP_TYPE rlm_eap_md5;
 109
 110 static const lt_dlmodule_t lt_dlmodules[] = {
 111         { "rlm_pap", &rlm_pap },
 112         { "rlm_chap", &rlm_chap },
 113         { "rlm_eap", &rlm_eap },
 114         { "rlm_eap_md5", &rlm_eap_md5 },
 115
 116         /*
 117          *      Add other modules here.
 118          */
 119
 120         { NULL, NULL }
 121 };
 122
 123
 124 lt_dlhandle lt_dlopenext(const char *name)
 125 {
 126         int i;
 127
 128         for (i = 0; lt_dlmodules[i].name != NULL; i++) {
 129                 if (strcmp(name, lt_dlmodules[i].name) == 0) {
 130                         return lt_dlmodules[i].ref;
 131                 }
 132         }
 133
 134         return NULL;
 135 }
 136
 137 void *lt_dlsym(lt_dlhandle handle, UNUSED const char *symbol)
 138 {
 139         return handle;
 140 }
 141 #endif /* WITHOUT_LIBLTDL */
 142
 143 static int virtual_server_idx(const char *name)
 144 {
 145         uint32_t hash;
 146
 147         if (!name) return 0;
 148
 149         hash = fr_hash_string(name);
 150
 151         return hash & (VIRTUAL_SERVER_HASH_SIZE - 1);
 152 }
 153
 154 static void virtual_server_free(virtual_server_t *server)
 155 {
 156         if (server->components) rbtree_free(server->components);
 157         server->components = NULL;
 158
 159         free(server);
 160 }
 161
 162 static void indexed_modcallable_free(void *data)
 163 {
 164         indexed_modcallable *c = data;
 165
 166         modcallable_free(&c->modulelist);
 167         free(c);
 168 }
 169
 170 static int indexed_modcallable_cmp(const void *one, const void *two)
 171 {
 172         const indexed_modcallable *a = one;
 173         const indexed_modcallable *b = two;
 174
 175         if (a->comp < b->comp) return -1;
 176         if (a->comp >  b->comp) return +1;
 177
 178         return a->idx - b->idx;
 179 }
 180
 181
 182 /*
 183  *      Compare two module entries
 184  */
 185 static int module_instance_cmp(const void *one, const void *two)
 186 {
 187         const module_instance_t *a = one;
 188         const module_instance_t *b = two;
 189
 190         return strcmp(a->name, b->name);
 191 }
 192
 193
 194 static void module_instance_free_old(CONF_SECTION *cs, module_instance_t *node,
 195                                      time_t when)
 196 {
 197         fr_module_hup_t *mh, **last;
 198
 199         /*
 200          *      Walk the list, freeing up old instances.
 201          */
 202         last = &(node->mh);
 203         while (*last) {
 204                 mh = *last;
 205
 206                 /*
 207                  *      Free only every 60 seconds.
 208                  */
 209                 if ((when - mh->when) < 60) {
 210                         last = &(mh->next);
 211                         continue;
 212                 }
 213
 214                 cf_section_parse_free(cs, mh->insthandle);
 215
 216                 if (node->entry->module->detach) {
 217                         (node->entry->module->detach)(mh->insthandle);
 218                 } else {
 219                         free(mh->insthandle);
 220                 }
 221
 222                 *last = mh->next;
 223                 free(mh);
 224         }
 225 }
 226
 227
 228 /*
 229  *      Free a module instance.
 230  */
 231 static void module_instance_free(void *data)
 232 {
 233         module_instance_t *this = data;
 234
 235         module_instance_free_old(this->cs, this, time(NULL) + 100);
 236
 237         if (this->entry->module->detach) {
 238                 (this->entry->module->detach)(this->insthandle);
 239         }
 240
 241 #ifdef HAVE_PTHREAD_H
 242         if (this->mutex) {
 243                 /*
 244                  *      FIXME
 245                  *      The mutex MIGHT be locked...
 246                  *      we'll check for that later, I guess.
 247                  */
 248                 pthread_mutex_destroy(this->mutex);
 249                 free(this->mutex);
 250         }
 251 #endif
 252         memset(this, 0, sizeof(*this));
 253         free(this);
 254 }
 255
 256
 257 /*
 258  *      Compare two module entries
 259  */
 260 static int module_entry_cmp(const void *one, const void *two)
 261 {
 262         const module_entry_t *a = one;
 263         const module_entry_t *b = two;
 264
 265         return strcmp(a->name, b->name);
 266 }
 267
 268 /*
 269  *      Free a module entry.
 270  */
 271 static void module_entry_free(void *data)
 272 {
 273         module_entry_t *this = data;
 274
 275         lt_dlclose(this->handle);       /* ignore any errors */
 276         memset(this, 0, sizeof(*this));
 277         free(this);
 278 }
 279
 280
 281 /*
 282  *      Remove the module lists.
 283  */
 284 int detach_modules(void)
 285 {
 286         int i;
 287
 288         for (i = 0; i < VIRTUAL_SERVER_HASH_SIZE; i++) {
 289                 virtual_server_t *server, *next;
 290
 291                 for (server = virtual_servers[i];
 292                      server != NULL;
 293                      server = next) {
 294                         next = server->next;
 295                         virtual_server_free(server);
 296                 }
 297         }
 298
 299         rbtree_free(instance_tree);
 300         rbtree_free(module_tree);
 301
 302         lt_dlexit();
 303
 304         return 0;
 305 }
 306
 307
 308 /*
 309  *      Find a module on disk or in memory, and link to it.
 310  */
 311 static module_entry_t *linkto_module(const char *module_name,
 312                                      CONF_SECTION *cs)
 313 {
 314         module_entry_t myentry;
 315         module_entry_t *node;
 316         lt_dlhandle handle;
 317         char module_struct[256];
 318         char *p;
 319         const module_t *module;
 320
 321         strlcpy(myentry.name, module_name, sizeof(myentry.name));
 322         node = rbtree_finddata(module_tree, &myentry);
 323         if (node) return node;
 324
 325         /*
 326          *      Keep the handle around so we can dlclose() it.
 327          */
 328         handle = lt_dlopenext(module_name);
 329         if (handle == NULL) {
 330                 cf_log_err(cf_sectiontoitem(cs),
 331                            "Failed to link to module '%s': %s\n",
 332                            module_name, lt_dlerror());
 333                 return NULL;
 334         }
 335
 336         /*
 337          *      Link to the module's rlm_FOO{} module structure.
 338          *
 339          *      The module_name variable has the version number
 340          *      embedded in it, and we don't want that here.
 341          */
 342         strcpy(module_struct, module_name);
 343         p = strrchr(module_struct, '-');
 344         if (p) *p = '\0';
 345
 346         DEBUG3("    (Loaded %s, checking if it's valid)", module_name);
 347
 348         /*
 349          *      libltld MAY core here, if the handle it gives us contains
 350          *      garbage data.
 351          */
 352         module = lt_dlsym(handle, module_struct);
 353         if (!module) {
 354                 cf_log_err(cf_sectiontoitem(cs),
 355                            "Failed linking to %s structure: %s\n",
 356                            module_name, lt_dlerror());
 357                 lt_dlclose(handle);
 358                 return NULL;
 359         }
 360         /*
 361          *      Before doing anything else, check if it's sane.
 362          */
 363         if (module->magic != RLM_MODULE_MAGIC_NUMBER) {
 364                 lt_dlclose(handle);
 365                 cf_log_err(cf_sectiontoitem(cs),
 366                            "Invalid version in module '%s'",
 367                            module_name);
 368                 return NULL;
 369
 370         }
 371
 372         /* make room for the module type */
 373         node = rad_malloc(sizeof(*node));
 374         memset(node, 0, sizeof(*node));
 375         strlcpy(node->name, module_name, sizeof(node->name));
 376         node->module = module;
 377         node->handle = handle;
 378
 379         cf_log_module(cs, "Linked to module %s", module_name);
 380
 381         /*
 382          *      Add the module as "rlm_foo-version" to the configuration
 383          *      section.
 384          */
 385         if (!rbtree_insert(module_tree, node)) {
 386                 radlog(L_ERR, "Failed to cache module %s", module_name);
 387                 lt_dlclose(handle);
 388                 free(node);
 389                 return NULL;
 390         }
 391
 392         return node;
 393 }
 394
 395 /*
 396  *      Find a module instance.
 397  */
 398 module_instance_t *find_module_instance(CONF_SECTION *modules,
 399                                         const char *instname, int do_link)
 400 {
 401         int check_config_safe = FALSE;
 402         CONF_SECTION *cs;
 403         const char *name1, *name2;
 404         module_instance_t *node, myNode;
 405         char module_name[256];
 406
 407         if (!modules) return NULL;
 408
 409         /*
 410          *      Module instances are declared in the modules{} block
 411          *      and referenced later by their name, which is the
 412          *      name2 from the config section, or name1 if there was
 413          *      no name2.
 414          */
 415         cs = cf_section_sub_find_name2(modules, NULL, instname);
 416         if (cs == NULL) {
 417                 radlog(L_ERR, "ERROR: Cannot find a configuration entry for module \"%s\".\n", instname);
 418                 return NULL;
 419         }
 420
 421         /*
 422          *      If there's already a module instance, return it.
 423          */
 424         strlcpy(myNode.name, instname, sizeof(myNode.name));
 425         node = rbtree_finddata(instance_tree, &myNode);
 426         if (node) return node;
 427
 428         if (!do_link) return NULL;
 429
 430         name1 = cf_section_name1(cs);
 431         name2 = cf_section_name2(cs);
 432
 433         /*
 434          *      Found the configuration entry.
 435          */
 436         node = rad_malloc(sizeof(*node));
 437         memset(node, 0, sizeof(*node));
 438
 439         node->insthandle = NULL;
 440         node->cs = cs;
 441
 442         /*
 443          *      Names in the "modules" section aren't prefixed
 444          *      with "rlm_", so we add it here.
 445          */
 446         snprintf(module_name, sizeof(module_name), "rlm_%s", name1);
 447
 448         node->entry = linkto_module(module_name, cs);
 449         if (!node->entry) {
 450                 free(node);
 451                 /* linkto_module logs any errors */
 452                 return NULL;
 453         }
 454
 455         if (check_config && (node->entry->module->instantiate) &&
 456             (node->entry->module->type & RLM_TYPE_CHECK_CONFIG_SAFE) == 0) {
 457                 const char *value = NULL;
 458                 CONF_PAIR *cp;
 459
 460                 cp = cf_pair_find(cs, "force_check_config");
 461                 if (cp) value = cf_pair_value(cp);
 462
 463                 if (value && (strcmp(value, "yes") == 0)) goto print_inst;
 464
 465                 cf_log_module(cs, "Skipping instantiation of %s", instname);
 466         } else {
 467         print_inst:
 468                 check_config_safe = TRUE;
 469                 cf_log_module(cs, "Instantiating %s", instname);
 470         }
 471
 472         /*
 473          *      Call the module's instantiation routine.
 474          */
 475         if ((node->entry->module->instantiate) &&
 476             (!check_config || check_config_safe) &&
 477             ((node->entry->module->instantiate)(cs, &node->insthandle) < 0)) {
 478                 cf_log_err(cf_sectiontoitem(cs),
 479                            "Instantiation failed for module \"%s\"",
 480                            instname);
 481                 free(node);
 482                 return NULL;
 483         }
 484
 485         /*
 486          *      We're done.  Fill in the rest of the data structure,
 487          *      and link it to the module instance list.
 488          */
 489         strlcpy(node->name, instname, sizeof(node->name));
 490
 491 #ifdef HAVE_PTHREAD_H
 492         /*
 493          *      If we're threaded, check if the module is thread-safe.
 494          *
 495          *      If it isn't, we create a mutex.
 496          */
 497         if ((node->entry->module->type & RLM_TYPE_THREAD_UNSAFE) != 0) {
 498                 node->mutex = (pthread_mutex_t *) rad_malloc(sizeof(pthread_mutex_t));
 499                 /*
 500                  *      Initialize the mutex.
 501                  */
 502                 pthread_mutex_init(node->mutex, NULL);
 503         } else {
 504                 /*
 505                  *      The module is thread-safe.  Don't give it a mutex.
 506                  */
 507                 node->mutex = NULL;
 508         }
 509
 510 #endif
 511         rbtree_insert(instance_tree, node);
 512
 513         return node;
 514 }
 515
 516 static indexed_modcallable *lookup_by_index(rbtree_t *components,
 517                                             int comp, int idx)
 518 {
 519         indexed_modcallable myc;
 520
 521         myc.comp = comp;
 522         myc.idx = idx;
 523
 524         return rbtree_finddata(components, &myc);
 525 }
 526
 527 /*
 528  *      Create a new sublist.
 529  */
 530 static indexed_modcallable *new_sublist(rbtree_t *components, int comp, int idx)
 531 {
 532         indexed_modcallable *c;
 533
 534         c = lookup_by_index(components, comp, idx);
 535
 536         /* It is an error to try to create a sublist that already
 537          * exists. It would almost certainly be caused by accidental
 538          * duplication in the config file.
 539          *
 540          * index 0 is the exception, because it is used when we want
 541          * to collect _all_ listed modules under a single index by
 542          * default, which is currently the case in all components
 543          * except authenticate. */
 544         if (c) {
 545                 if (idx == 0) {
 546                         return c;
 547                 }
 548                 return NULL;
 549         }
 550
 551         c = rad_malloc(sizeof(*c));
 552         c->modulelist = NULL;
 553         c->comp = comp;
 554         c->idx = idx;
 555
 556         if (!rbtree_insert(components, c)) {
 557                 free(c);
 558                 return NULL;
 559         }
 560
 561         return c;
 562 }
 563
 564 int indexed_modcall(int comp, int idx, REQUEST *request)
 565 {
 566         int rcode;
 567         indexed_modcallable *this;
 568         modcallable *list = NULL;
 569         virtual_server_t *server;
 570
 571         rcode = virtual_server_idx(request->server);
 572         for (server = virtual_servers[rcode];
 573              server != NULL;
 574              server = server->next) {
 575                 if (!request->server && !server->name) break;
 576
 577                 if ((request->server && server->name) &&
 578                     (strcmp(request->server, server->name) == 0)) break;
 579         }
 580
 581         if (!server) {
 582                 RDEBUG("No such virtual server %s", request->server);
 583                 return RLM_MODULE_FAIL;
 584         }
 585
 586         this = lookup_by_index(server->components, comp, idx);
 587         if (!this) {
 588                 if (idx != 0) DEBUG2("  WARNING: Unknown value specified for %s.  Cannot perform requested action.",
 589                                      section_type_value[comp].typename);
 590         } else {
 591                 list = this->modulelist;
 592         }
 593
 594         request->component = section_type_value[comp].section;
 595
 596         rcode = modcall(comp, list, request);
 597
 598         request->module = "";
 599         request->component = "";
 600         return rcode;
 601 }
 602
 603 /*
 604  *      Load a sub-module list, as found inside an Auth-Type foo {}
 605  *      block
 606  */
 607 static int load_subcomponent_section(modcallable *parent, CONF_SECTION *cs,
 608                                      rbtree_t *components, int attr, int comp)
 609 {
 610         indexed_modcallable *subcomp;
 611         modcallable *ml;
 612         DICT_VALUE *dval;
 613         const char *name2 = cf_section_name2(cs);
 614
 615         rad_assert(comp >= RLM_COMPONENT_AUTH);
 616         rad_assert(comp < RLM_COMPONENT_COUNT);
 617
 618         /*
 619          *      Sanity check.
 620          */
 621         if (!name2) {
 622                 cf_log_err(cf_sectiontoitem(cs),
 623                            "No name specified for %s block",
 624                            section_type_value[comp].typename);
 625                 return 1;
 626         }
 627
 628         /*
 629          *      Compile the group.
 630          */
 631         ml = compile_modgroup(parent, comp, cs);
 632         if (!ml) {
 633                 return 0;
 634         }
 635
 636         /*
 637          *      We must assign a numeric index to this subcomponent.
 638          *      It is generated and placed in the dictionary
 639          *      automatically.  If it isn't found, it's a serious
 640          *      error.
 641          */
 642         dval = dict_valbyname(attr, name2);
 643         if (!dval) {
 644                 cf_log_err(cf_sectiontoitem(cs),
 645                            "%s %s Not previously configured",
 646                            section_type_value[comp].typename, name2);
 647                 modcallable_free(&ml);
 648                 return 0;
 649         }
 650
 651         subcomp = new_sublist(components, comp, dval->value);
 652         if (!subcomp) {
 653                 modcallable_free(&ml);
 654                 return 1;
 655         }
 656
 657         subcomp->modulelist = ml;
 658         return 1;               /* OK */
 659 }
 660
 661 static int define_type(const DICT_ATTR *dattr, const char *name)
 662 {
 663         uint32_t value;
 664         DICT_VALUE *dval;
 665
 666         /*
 667          *      If the value already exists, don't
 668          *      create it again.
 669          */
 670         dval = dict_valbyname(dattr->attr, name);
 671         if (dval) return 1;
 672
 673         /*
 674          *      Create a new unique value with a
 675          *      meaningless number.  You can't look at
 676          *      it from outside of this code, so it
 677          *      doesn't matter.  The only requirement
 678          *      is that it's unique.
 679          */
 680         do {
 681                 value = fr_rand() & 0x00ffffff;
 682         } while (dict_valbyattr(dattr->attr, value));
 683
 684         if (dict_addvalue(name, dattr->name, value) < 0) {
 685                 radlog(L_ERR, "%s", fr_strerror());
 686                 return 0;
 687         }
 688
 689         return 1;
 690 }
 691
 692 static int load_component_section(CONF_SECTION *cs,
 693                                   rbtree_t *components, int comp)
 694 {
 695         modcallable *this;
 696         CONF_ITEM *modref;
 697         int idx;
 698         indexed_modcallable *subcomp;
 699         const char *modname;
 700         const char *visiblename;
 701         const DICT_ATTR *dattr;
 702
 703         /*
 704          *      Find the attribute used to store VALUEs for this section.
 705          */
 706         dattr = dict_attrbyvalue(section_type_value[comp].attr);
 707         if (!dattr) {
 708                 cf_log_err(cf_sectiontoitem(cs),
 709                            "No such attribute %s",
 710                            section_type_value[comp].typename);
 711                 return -1;
 712         }
 713
 714         /*
 715          *      Loop over the entries in the named section, loading
 716          *      the sections this time.
 717          */
 718         for (modref = cf_item_find_next(cs, NULL);
 719              modref != NULL;
 720              modref = cf_item_find_next(cs, modref)) {
 721                 const char *name1;
 722                 CONF_PAIR *cp = NULL;
 723                 CONF_SECTION *scs = NULL;
 724
 725                 if (cf_item_is_section(modref)) {
 726                         scs = cf_itemtosection(modref);
 727
 728                         name1 = cf_section_name1(scs);
 729
 730                         if (strcmp(name1,
 731                                    section_type_value[comp].typename) == 0) {
 732                                 if (!load_subcomponent_section(NULL, scs,
 733                                                                components,
 734                                                                dattr->attr,
 735                                                                comp)) {
 736                                         return -1; /* FIXME: memleak? */
 737                                 }
 738                                 continue;
 739                         }
 740
 741                         cp = NULL;
 742
 743                 } else if (cf_item_is_pair(modref)) {
 744                         cp = cf_itemtopair(modref);
 745
 746                 } else {
 747                         continue; /* ignore it */
 748                 }
 749
 750                 /*
 751                  *      Try to compile one entry.
 752                  */
 753                 this = compile_modsingle(NULL, comp, modref, &modname);
 754                 if (!this) {
 755                         cf_log_err(cf_sectiontoitem(cs),
 756                                    "Errors parsing %s section.\n",
 757                                    cf_section_name1(cs));
 758                         return -1;
 759                 }
 760
 761                 /*
 762                  *      Look for Auth-Type foo {}, which are special
 763                  *      cases of named sections, and allowable ONLY
 764                  *      at the top-level.
 765                  *
 766                  *      i.e. They're not allowed in a "group" or "redundant"
 767                  *      subsection.
 768                  */
 769                 if (comp == RLM_COMPONENT_AUTH) {
 770                         DICT_VALUE *dval;
 771                         const char *modrefname = NULL;
 772                         if (cp) {
 773                                 modrefname = cf_pair_attr(cp);
 774                         } else {
 775                                 modrefname = cf_section_name2(scs);
 776                                 if (!modrefname) {
 777                                         modcallable_free(&this);
 778                                         cf_log_err(cf_sectiontoitem(cs),
 779                                                    "Errors parsing %s sub-section.\n",
 780                                                    cf_section_name1(scs));
 781                                         return -1;
 782                                 }
 783                         }
 784
 785                         dval = dict_valbyname(PW_AUTH_TYPE, modrefname);
 786                         if (!dval) {
 787                                 /*
 788                                  *      It's a section, but nothing we
 789                                  *      recognize.  Die!
 790                                  */
 791                                 modcallable_free(&this);
 792                                 cf_log_err(cf_sectiontoitem(cs),
 793                                            "Unknown Auth-Type \"%s\" in %s sub-section.",
 794                                            modrefname, section_type_value[comp].section);
 795                                 return -1;
 796                         }
 797                         idx = dval->value;
 798                 } else {
 799                         /* See the comment in new_sublist() for explanation
 800                          * of the special index 0 */
 801                         idx = 0;
 802                 }
 803
 804                 subcomp = new_sublist(components, comp, idx);
 805                 if (subcomp == NULL) {
 806                         modcallable_free(&this);
 807                         continue;
 808                 }
 809
 810                 /* If subcomp->modulelist is NULL, add_to_modcallable will
 811                  * create it */
 812                 visiblename = cf_section_name2(cs);
 813                 if (visiblename == NULL)
 814                         visiblename = cf_section_name1(cs);
 815                 add_to_modcallable(&subcomp->modulelist, this,
 816                                    comp, visiblename);
 817         }
 818
 819         return 0;
 820 }
 821
 822 static int load_byserver(CONF_SECTION *cs)
 823 {
 824         int comp, flag;
 825         const char *name = cf_section_name2(cs);
 826         rbtree_t *components;
 827         virtual_server_t *server;
 828
 829         cf_log_info(cs, " modules {");
 830
 831         components = rbtree_create(indexed_modcallable_cmp,
 832                                    indexed_modcallable_free, 0);
 833         if (!components) {
 834                 radlog(L_ERR, "Failed to initialize components\n");
 835                 return -1;
 836         }
 837
 838         server = rad_malloc(sizeof(*server));
 839         memset(server, 0, sizeof(*server));
 840
 841         server->name = name;
 842         server->cs = cs;
 843         server->components = components;
 844
 845         /*
 846          *      Define types first.
 847          */
 848         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
 849                 CONF_SECTION *subcs;
 850                 CONF_ITEM *modref;
 851                 DICT_ATTR *dattr;
 852
 853                 subcs = cf_section_sub_find(cs,
 854                                             section_type_value[comp].section);
 855                 if (!subcs) continue;
 856
 857                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
 858
 859                 /*
 860                  *      Find the attribute used to store VALUEs for this section.
 861                  */
 862                 dattr = dict_attrbyvalue(section_type_value[comp].attr);
 863                 if (!dattr) {
 864                         cf_log_err(cf_sectiontoitem(subcs),
 865                                    "No such attribute %s",
 866                                    section_type_value[comp].typename);
 867                         cf_log_info(cs, " }");
 868                 error:
 869                         virtual_server_free(server);
 870                         return -1;
 871                 }
 872
 873                 /*
 874                  *      Define dynamic types, so that others can reference
 875                  *      them.
 876                  */
 877                 for (modref = cf_item_find_next(subcs, NULL);
 878                      modref != NULL;
 879                      modref = cf_item_find_next(subcs, modref)) {
 880                         const char *name1;
 881                         CONF_SECTION *subsubcs;
 882
 883                         /*
 884                          *      Create types for simple references
 885                          *      only when parsing the authenticate
 886                          *      section.
 887                          */
 888                         if ((section_type_value[comp].attr == PW_AUTH_TYPE) &&
 889                             cf_item_is_pair(modref)) {
 890                                 CONF_PAIR *cp = cf_itemtopair(modref);
 891                                 if (!define_type(dattr, cf_pair_attr(cp))) {
 892                                         goto error;
 893                                 }
 894
 895                                 continue;
 896                         }
 897
 898                         if (!cf_item_is_section(modref)) continue;
 899
 900                         subsubcs = cf_itemtosection(modref);
 901                         name1 = cf_section_name1(subsubcs);
 902
 903                         if (strcmp(name1, section_type_value[comp].typename) == 0) {
 904                                 if (!define_type(dattr,
 905                                                  cf_section_name2(subsubcs))) {
 906                                         cf_log_info(cs, " }");
 907                                         goto error;
 908                                 }
 909                         }
 910                 }
 911         } /* loop over components */
 912
 913         /*
 914          *      Loop over all of the known components, finding their
 915          *      configuration section, and loading it.
 916          */
 917         flag = 0;
 918         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
 919                 CONF_SECTION *subcs;
 920
 921                 subcs = cf_section_sub_find(cs,
 922                                             section_type_value[comp].section);
 923                 if (!subcs) continue;
 924
 925                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
 926
 927                 cf_log_module(cs, "Checking %s {...} for more modules to load",
 928                        section_type_value[comp].section);
 929
 930 #ifdef WITH_PROXY
 931                 /*
 932                  *      Skip pre/post-proxy sections if we're not
 933                  *      proxying.
 934                  */
 935                 if (!mainconfig.proxy_requests &&
 936                     ((comp == PW_PRE_PROXY_TYPE) ||
 937                      (comp == PW_PRE_PROXY_TYPE))) {
 938                         continue;
 939                 }
 940 #endif
 941
 942                 if (load_component_section(subcs, components, comp) < 0) {
 943                         cf_log_info(cs, " }");
 944                         goto error;
 945                 }
 946                 flag = 1;
 947         } /* loop over components */
 948
 949         /*
 950          *      We haven't loaded any of the normal sections.  Maybe we're
 951          *      supposed to load the vmps section.
 952          *
 953          *      This is a bit of a hack...
 954          */
 955         if (!flag) {
 956                 CONF_SECTION *subcs;
 957
 958                 subcs = cf_section_sub_find(cs, "vmps");
 959                 if (subcs) {
 960                         cf_log_module(cs, "Checking vmps {...} for more modules to load");
 961                         if (load_component_section(subcs, components,
 962                                                    RLM_COMPONENT_POST_AUTH) < 0) {
 963                                 goto error;
 964                         }
 965                         flag = 1;
 966                 }
 967
 968 #ifdef WITH_DHCP
 969                 if (!flag) {
 970                         const DICT_ATTR *dattr;
 971
 972                         dattr = dict_attrbyname("DHCP-Message-Type");
 973                         if (!dattr) {
 974                                 radlog(L_ERR, "No DHCP-Message-Type attribute");
 975                                 goto error;
 976                         }
 977
 978                         /*
 979                          *      Handle each DHCP Message type separately.
 980                          */
 981                         for (subcs = cf_subsection_find_next(cs, NULL,
 982                                                              "dhcp");
 983                              subcs != NULL;
 984                              subcs = cf_subsection_find_next(cs, subcs,
 985                                                              "dhcp")) {
 986                                 const char *name2 = cf_section_name2(subcs);
 987
 988                                 DEBUG2(" Module: Checking dhcp %s {...} for more modules to load", name2);
 989                                 if (!load_subcomponent_section(NULL, subcs,
 990                                                                components,
 991                                                                dattr->attr,
 992                                                                RLM_COMPONENT_POST_AUTH)) {
 993                                         goto error; /* FIXME: memleak? */
 994                                 }
 995                                 flag = 1;
 996                         }
 997                 }
 998 #endif
 999         }
1000
1001         cf_log_info(cs, " }");
1002
1003         if (!flag && name) {
1004                 DEBUG("WARNING: Server %s is empty, and will do nothing!",
1005                       name);
1006         }
1007
1008         /*
1009          *      Now that it is OK, insert it into the list.
1010          *
1011          *      This is thread-safe...
1012          */
1013         comp = virtual_server_idx(name);
1014         server->next = virtual_servers[comp];
1015         virtual_servers[comp] = server;
1016
1017         return 0;
1018 }
1019
1020
1021 /*
1022  *      Load all of the virtual servers.
1023  */
1024 int virtual_server_load(CONF_SECTION *config)
1025 {
1026         int null_server = FALSE;
1027         CONF_SECTION *cs;
1028
1029         DEBUG2("%s: #### Loading Virtual Servers ####", mainconfig.name);
1030
1031         /*
1032          *      Load all of the virtual servers.
1033          */
1034         for (cs = cf_subsection_find_next(config, NULL, "server");
1035              cs != NULL;
1036              cs = cf_subsection_find_next(config, cs, "server")) {
1037                 const char *name2 = cf_section_name2(cs);
1038
1039                 if (name2) {
1040                         cf_log_info(cs, "server %s {", name2);
1041                 } else {
1042                         cf_log_info(cs, "server {");
1043                         null_server = TRUE;
1044                 }
1045                 if (load_byserver(cs) < 0) {
1046                         cf_log_info(cs, "}");
1047                         return -1;
1048                 }
1049                 cf_log_info(cs, "}");
1050                 if (debug_flag == 0) {
1051                         radlog(L_INFO, "Loaded virtual server %s", name2);
1052                 }
1053         }
1054
1055         /*
1056          *      No empty server defined.  Try to load an old-style
1057          *      one for backwards compatibility.
1058          */
1059         if (!null_server) {
1060                 cf_log_info(cs, "server {");
1061                 if (load_byserver(config) < 0) {
1062                         cf_log_info(cs, "}");
1063                         return -1;
1064                 }
1065                 cf_log_info(cs, "}");
1066         }
1067
1068         return 0;
1069 }
1070
1071
1072 int module_hup_module(CONF_SECTION *cs, module_instance_t *node, time_t when)
1073 {
1074         void *insthandle = NULL;
1075         fr_module_hup_t *mh;
1076
1077         if (!node ||
1078             !node->entry->module->instantiate ||
1079             ((node->entry->module->type & RLM_TYPE_HUP_SAFE) == 0)) {
1080                 return 1;
1081         }
1082
1083         cf_log_module(cs, "Trying to reload module \"%s\"", node->name);
1084
1085         if ((node->entry->module->instantiate)(cs, &insthandle) < 0) {
1086                 cf_log_err(cf_sectiontoitem(cs),
1087                            "HUP failed for module \"%s\".  Using old configuration.",
1088                            node->name);
1089                 return 0;
1090         }
1091
1092         radlog(L_INFO, " Module: Reloaded module \"%s\"", node->name);
1093
1094         module_instance_free_old(cs, node, when);
1095
1096         /*
1097          *      Save the old instance handle for later deletion.
1098          */
1099         mh = rad_malloc(sizeof(*mh));
1100         mh->mi = node;
1101         mh->when = when;
1102         mh->insthandle = node->insthandle;
1103         mh->next = node->mh;
1104         node->mh = mh;
1105
1106         node->insthandle = insthandle;
1107
1108         /*
1109          *      FIXME: Set a timeout to come back in 60s, so that
1110          *      we can pro-actively clean up the old instances.
1111          */
1112
1113         return 1;
1114 }
1115
1116
1117 int module_hup(CONF_SECTION *modules)
1118 {
1119         time_t when;
1120         CONF_ITEM *ci;
1121         CONF_SECTION *cs;
1122         module_instance_t *node;
1123
1124         if (!modules) return 0;
1125
1126         when = time(NULL);
1127
1128         /*
1129          *      Loop over the modules
1130          */
1131         for (ci=cf_item_find_next(modules, NULL);
1132              ci != NULL;
1133              ci=cf_item_find_next(modules, ci)) {
1134                 const char *instname;
1135                 module_instance_t myNode;
1136
1137                 /*
1138                  *      If it's not a section, ignore it.
1139                  */
1140                 if (!cf_item_is_section(ci)) continue;
1141
1142                 cs = cf_itemtosection(ci);
1143                 instname = cf_section_name2(cs);
1144                 if (!instname) instname = cf_section_name1(cs);
1145
1146                 strlcpy(myNode.name, instname, sizeof(myNode.name));
1147                 node = rbtree_finddata(instance_tree, &myNode);
1148
1149                 module_hup_module(cs, node, when);
1150         }
1151
1152         return 1;
1153 }
1154
1155
1156 /*
1157  *      Parse the module config sections, and load
1158  *      and call each module's init() function.
1159  *
1160  *      Libtool makes your life a LOT easier, especially with libltdl.
1161  *      see: http://www.gnu.org/software/libtool/
1162  */
1163 int setup_modules(int reload, CONF_SECTION *config)
1164 {
1165         CONF_SECTION    *cs, *modules;
1166         rad_listen_t    *listener;
1167
1168         if (reload) return 0;
1169
1170         /*
1171          *      If necessary, initialize libltdl.
1172          */
1173         if (!reload) {
1174                 /*
1175                  *      Set the default list of preloaded symbols.
1176                  *      This is used to initialize libltdl's list of
1177                  *      preloaded modules.
1178                  *
1179                  *      i.e. Static modules.
1180                  */
1181                 LTDL_SET_PRELOADED_SYMBOLS();
1182
1183                 if (lt_dlinit() != 0) {
1184                         radlog(L_ERR, "Failed to initialize libraries: %s\n",
1185                                         lt_dlerror());
1186                         return -1;
1187                 }
1188
1189                 /*
1190                  *      Set the search path to ONLY our library directory.
1191                  *      This prevents the modules from being found from
1192                  *      any location on the disk.
1193                  */
1194                 lt_dlsetsearchpath(radlib_dir);
1195
1196                 /*
1197                  *      Set up the internal module struct.
1198                  */
1199                 module_tree = rbtree_create(module_entry_cmp,
1200                                             module_entry_free, 0);
1201                 if (!module_tree) {
1202                         radlog(L_ERR, "Failed to initialize modules\n");
1203                         return -1;
1204                 }
1205
1206                 instance_tree = rbtree_create(module_instance_cmp,
1207                                               module_instance_free, 0);
1208                 if (!instance_tree) {
1209                         radlog(L_ERR, "Failed to initialize modules\n");
1210                         return -1;
1211                 }
1212         }
1213
1214         memset(virtual_servers, 0, sizeof(virtual_servers));
1215
1216         /*
1217          *      Remember where the modules were stored.
1218          */
1219         modules = cf_section_sub_find(config, "modules");
1220         if (!modules) {
1221                 radlog(L_ERR, "Cannot find a \"modules\" section in the configuration file!");
1222                 return -1;
1223         }
1224
1225         DEBUG2("%s: #### Instantiating modules ####", mainconfig.name);
1226
1227         /*
1228          *  Look for the 'instantiate' section, which tells us
1229          *  the instantiation order of the modules, and also allows
1230          *  us to load modules with no authorize/authenticate/etc.
1231          *  sections.
1232          */
1233         cs = cf_section_sub_find(config, "instantiate");
1234         if (cs != NULL) {
1235                 CONF_ITEM *ci;
1236                 CONF_PAIR *cp;
1237                 module_instance_t *module;
1238                 const char *name;
1239
1240                 cf_log_info(cs, " instantiate {");
1241
1242                 /*
1243                  *  Loop over the items in the 'instantiate' section.
1244                  */
1245                 for (ci=cf_item_find_next(cs, NULL);
1246                      ci != NULL;
1247                      ci=cf_item_find_next(cs, ci)) {
1248
1249                         /*
1250                          *      Skip sections and "other" stuff.
1251                          *      Sections will be handled later, if
1252                          *      they're referenced at all...
1253                          */
1254                         if (!cf_item_is_pair(ci)) {
1255                                 continue;
1256                         }
1257
1258                         cp = cf_itemtopair(ci);
1259                         name = cf_pair_attr(cp);
1260                         module = find_module_instance(modules, name, 1);
1261                         if (!module) {
1262                                 return -1;
1263                         }
1264                 } /* loop over items in the subsection */
1265
1266                 cf_log_info(cs, " }");
1267         } /* if there's an 'instantiate' section. */
1268
1269         /*
1270          *      Loop over the listeners, figuring out which sections
1271          *      to load.
1272          */
1273         for (listener = mainconfig.listen;
1274              listener != NULL;
1275              listener = listener->next) {
1276                 char buffer[256];
1277
1278                 if (listener->type == RAD_LISTEN_PROXY) continue;
1279
1280                 cs = cf_section_sub_find_name2(config,
1281                                                "server", listener->server);
1282                 if (!cs && (listener->server != NULL)) {
1283                         listener->print(listener, buffer, sizeof(buffer));
1284
1285                         radlog(L_ERR, "No server has been defined for %s", buffer);
1286                         return -1;
1287                 }
1288         }
1289
1290         if (virtual_server_load(config) < 0) return -1;
1291
1292         return 0;
1293 }
1294
1295 /*
1296  *      Call all authorization modules until one returns
1297  *      somethings else than RLM_MODULE_OK
1298  */
1299 int module_authorize(int autz_type, REQUEST *request)
1300 {
1301         return indexed_modcall(RLM_COMPONENT_AUTZ, autz_type, request);
1302 }
1303
1304 /*
1305  *      Authenticate a user/password with various methods.
1306  */
1307 int module_authenticate(int auth_type, REQUEST *request)
1308 {
1309         return indexed_modcall(RLM_COMPONENT_AUTH, auth_type, request);
1310 }
1311
1312 #ifdef WITH_ACCOUNTING
1313 /*
1314  *      Do pre-accounting for ALL configured sessions
1315  */
1316 int module_preacct(REQUEST *request)
1317 {
1318         return indexed_modcall(RLM_COMPONENT_PREACCT, 0, request);
1319 }
1320
1321 /*
1322  *      Do accounting for ALL configured sessions
1323  */
1324 int module_accounting(int acct_type, REQUEST *request)
1325 {
1326         return indexed_modcall(RLM_COMPONENT_ACCT, acct_type, request);
1327 }
1328 #endif
1329
1330 #ifdef WITH_SESSION_MGMT
1331 /*
1332  *      See if a user is already logged in.
1333  *
1334  *      Returns: 0 == OK, 1 == double logins, 2 == multilink attempt
1335  */
1336 int module_checksimul(int sess_type, REQUEST *request, int maxsimul)
1337 {
1338         int rcode;
1339
1340         if(!request->username)
1341                 return 0;
1342
1343         request->simul_count = 0;
1344         request->simul_max = maxsimul;
1345         request->simul_mpp = 1;
1346
1347         rcode = indexed_modcall(RLM_COMPONENT_SESS, sess_type, request);
1348
1349         if (rcode != RLM_MODULE_OK) {
1350                 /* FIXME: Good spot for a *rate-limited* warning to the log */
1351                 return 0;
1352         }
1353
1354         return (request->simul_count < maxsimul) ? 0 : request->simul_mpp;
1355 }
1356 #endif
1357
1358 #ifdef WITH_PROXY
1359 /*
1360  *      Do pre-proxying for ALL configured sessions
1361  */
1362 int module_pre_proxy(int type, REQUEST *request)
1363 {
1364         return indexed_modcall(RLM_COMPONENT_PRE_PROXY, type, request);
1365 }
1366
1367 /*
1368  *      Do post-proxying for ALL configured sessions
1369  */
1370 int module_post_proxy(int type, REQUEST *request)
1371 {
1372         return indexed_modcall(RLM_COMPONENT_POST_PROXY, type, request);
1373 }
1374 #endif
1375
1376 /*
1377  *      Do post-authentication for ALL configured sessions
1378  */
1379 int module_post_auth(int postauth_type, REQUEST *request)
1380 {
1381         return indexed_modcall(RLM_COMPONENT_POST_AUTH, postauth_type, request);
1382 }