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         const           char *server;
  37         int             comp;
  38         int             idx;
  39         modcallable     *modulelist;
  40 } indexed_modcallable;
  41
  42 /*
  43  *      For each component, keep an ordered list of ones to call.
  44  */
  45 static rbtree_t *components = NULL;
  46
  47 static rbtree_t *module_tree = NULL;
  48
  49 static rbtree_t *instance_tree = NULL;
  50
  51 typedef struct section_type_value_t {
  52         const char      *section;
  53         const char      *typename;
  54         int             attr;
  55 } section_type_value_t;
  56
  57 /*
  58  *      Ordered by component
  59  */
  60 static const section_type_value_t section_type_value[RLM_COMPONENT_COUNT] = {
  61         { "authenticate", "Auth-Type",       PW_AUTH_TYPE },
  62         { "authorize",    "Autz-Type",       PW_AUTZ_TYPE },
  63         { "preacct",      "Pre-Acct-Type",   PW_PRE_ACCT_TYPE },
  64         { "accounting",   "Acct-Type",       PW_ACCT_TYPE },
  65         { "session",      "Session-Type",    PW_SESSION_TYPE },
  66         { "pre-proxy",    "Pre-Proxy-Type",  PW_PRE_PROXY_TYPE },
  67         { "post-proxy",   "Post-Proxy-Type", PW_POST_PROXY_TYPE },
  68         { "post-auth",    "Post-Auth-Type",  PW_POST_AUTH_TYPE },
  69 };
  70
  71
  72 #ifdef WITHOUT_LIBLTDL
  73 typedef struct lt_dlmodule_t {
  74   const char    *name;
  75   void          *ref;
  76 } lt_dlmodule_t;
  77
  78 /*
  79  *      Define modules here.
  80  */
  81 extern module_t rlm_pap;
  82 extern module_t rlm_chap;
  83 extern module_t rlm_eap;
  84
  85 /*
  86  *      EAP structures are defined elsewhere.
  87  */
  88 typedef struct eap_type_t EAP_TYPE;
  89
  90 /*
  91  *      And so on for other EAP types.
  92  */
  93 extern EAP_TYPE rlm_eap_md5;
  94
  95 static const lt_dlmodule_t lt_dlmodules[] = {
  96         { "rlm_pap", &rlm_pap },
  97         { "rlm_chap", &rlm_chap },
  98         { "rlm_eap", &rlm_eap },
  99         { "rlm_eap_md5", &rlm_eap_md5 },
 100
 101         /*
 102          *      Add other modules here.
 103          */
 104
 105         { NULL, NULL }
 106 };
 107
 108
 109 lt_dlhandle lt_dlopenext(const char *name)
 110 {
 111         int i;
 112
 113         for (i = 0; lt_dlmodules[i].name != NULL; i++) {
 114                 if (strcmp(name, lt_dlmodules[i].name) == 0) {
 115                         return lt_dlmodules[i].ref;
 116                 }
 117         }
 118
 119         return NULL;
 120 }
 121
 122 void *lt_dlsym(lt_dlhandle handle, UNUSED const char *symbol)
 123 {
 124         return handle;
 125 }
 126 #endif /* WITHOUT_LIBLTDL */
 127
 128
 129 static void indexed_modcallable_free(void *data)
 130 {
 131         indexed_modcallable *c = data;
 132
 133         modcallable_free(&c->modulelist);
 134         free(c);
 135 }
 136
 137 static int indexed_modcallable_cmp(const void *one, const void *two)
 138 {
 139         int rcode;
 140         const indexed_modcallable *a = one;
 141         const indexed_modcallable *b = two;
 142
 143         if (a->server && !b->server) return -1;
 144         if (!a->server && b->server) return +1;
 145         if (a->server && b->server) {
 146                 rcode = strcmp(a->server, b->server);
 147                 if (rcode != 0) return rcode;
 148         }
 149
 150         if (a->comp < b->comp) return -1;
 151         if (a->comp >  b->comp) return +1;
 152
 153         return a->idx - b->idx;
 154 }
 155
 156
 157 /*
 158  *      Compare two module entries
 159  */
 160 static int module_instance_cmp(const void *one, const void *two)
 161 {
 162         const module_instance_t *a = one;
 163         const module_instance_t *b = two;
 164
 165         return strcmp(a->name, b->name);
 166 }
 167
 168
 169 /*
 170  *      Free a module instance.
 171  */
 172 static void module_instance_free(void *data)
 173 {
 174         module_instance_t *this = data;
 175
 176         if (this->entry->module->detach) {
 177                 int i;
 178
 179                 (this->entry->module->detach)(this->insthandle);
 180                 for (i = 0; i < 16; i++) {
 181                         if (this->old_insthandle[i]) {
 182                                 (this->entry->module->detach)(this->old_insthandle[i]);
 183                         }
 184                 }
 185         }
 186
 187 #ifdef HAVE_PTHREAD_H
 188         if (this->mutex) {
 189                 /*
 190                  *      FIXME
 191                  *      The mutex MIGHT be locked...
 192                  *      we'll check for that later, I guess.
 193                  */
 194                 pthread_mutex_destroy(this->mutex);
 195                 free(this->mutex);
 196         }
 197 #endif
 198         memset(this, 0, sizeof(*this));
 199         free(this);
 200 }
 201
 202
 203 /*
 204  *      Compare two module entries
 205  */
 206 static int module_entry_cmp(const void *one, const void *two)
 207 {
 208         const module_entry_t *a = one;
 209         const module_entry_t *b = two;
 210
 211         return strcmp(a->name, b->name);
 212 }
 213
 214 /*
 215  *      Free a module entry.
 216  */
 217 static void module_entry_free(void *data)
 218 {
 219         module_entry_t *this = data;
 220
 221         lt_dlclose(this->handle);       /* ignore any errors */
 222         memset(this, 0, sizeof(*this));
 223         free(this);
 224 }
 225
 226
 227 /*
 228  *      Remove the module lists.
 229  */
 230 int detach_modules(void)
 231 {
 232         rbtree_free(instance_tree);
 233         rbtree_free(components);
 234         rbtree_free(module_tree);
 235
 236         lt_dlexit();
 237
 238         return 0;
 239 }
 240
 241
 242 /*
 243  *      Find a module on disk or in memory, and link to it.
 244  */
 245 static module_entry_t *linkto_module(const char *module_name,
 246                                      CONF_SECTION *cs)
 247 {
 248         module_entry_t myentry;
 249         module_entry_t *node;
 250         lt_dlhandle handle;
 251         char module_struct[256];
 252         char *p;
 253         const module_t *module;
 254
 255         strlcpy(myentry.name, module_name, sizeof(myentry.name));
 256         node = rbtree_finddata(module_tree, &myentry);
 257         if (node) return node;
 258
 259         /*
 260          *      Keep the handle around so we can dlclose() it.
 261          */
 262         handle = lt_dlopenext(module_name);
 263         if (handle == NULL) {
 264                 cf_log_err(cf_sectiontoitem(cs),
 265                            "Failed to link to module '%s': %s\n",
 266                            module_name, lt_dlerror());
 267                 return NULL;
 268         }
 269
 270         /*
 271          *      Link to the module's rlm_FOO{} module structure.
 272          *
 273          *      The module_name variable has the version number
 274          *      embedded in it, and we don't want that here.
 275          */
 276         strcpy(module_struct, module_name);
 277         p = strrchr(module_struct, '-');
 278         if (p) *p = '\0';
 279
 280         DEBUG3("    (Loaded %s, checking if it's valid)", module_name);
 281
 282         /*
 283          *      libltld MAY core here, if the handle it gives us contains
 284          *      garbage data.
 285          */
 286         module = lt_dlsym(handle, module_struct);
 287         if (!module) {
 288                 cf_log_err(cf_sectiontoitem(cs),
 289                            "Failed linking to %s structure: %s\n",
 290                            module_name, lt_dlerror());
 291                 lt_dlclose(handle);
 292                 return NULL;
 293         }
 294         /*
 295          *      Before doing anything else, check if it's sane.
 296          */
 297         if (module->magic != RLM_MODULE_MAGIC_NUMBER) {
 298                 lt_dlclose(handle);
 299                 cf_log_err(cf_sectiontoitem(cs),
 300                            "Invalid version in module '%s'",
 301                            module_name);
 302                 return NULL;
 303
 304         }
 305
 306         /* make room for the module type */
 307         node = rad_malloc(sizeof(*node));
 308         memset(node, 0, sizeof(*node));
 309         strlcpy(node->name, module_name, sizeof(node->name));
 310         node->module = module;
 311         node->handle = handle;
 312
 313         cf_log_module(cs, "Linked to module %s", module_name);
 314
 315         /*
 316          *      Add the module as "rlm_foo-version" to the configuration
 317          *      section.
 318          */
 319         if (!rbtree_insert(module_tree, node)) {
 320                 radlog(L_ERR, "Failed to cache module %s", module_name);
 321                 lt_dlclose(handle);
 322                 free(node);
 323                 return NULL;
 324         }
 325
 326         return node;
 327 }
 328
 329 /*
 330  *      Find a module instance.
 331  */
 332 module_instance_t *find_module_instance(CONF_SECTION *modules,
 333                                         const char *instname)
 334 {
 335         CONF_SECTION *cs;
 336         const char *name1, *name2;
 337         module_instance_t *node, myNode;
 338         char module_name[256];
 339
 340         if (!modules) return NULL;
 341
 342         /*
 343          *      Module instances are declared in the modules{} block
 344          *      and referenced later by their name, which is the
 345          *      name2 from the config section, or name1 if there was
 346          *      no name2.
 347          */
 348         cs = cf_section_sub_find_name2(modules, NULL, instname);
 349         if (cs == NULL) {
 350                 radlog(L_ERR, "ERROR: Cannot find a configuration entry for module \"%s\".\n", instname);
 351                 return NULL;
 352         }
 353
 354         /*
 355          *      If there's already a module instance, return it.
 356          */
 357         strlcpy(myNode.name, instname, sizeof(myNode.name));
 358         node = rbtree_finddata(instance_tree, &myNode);
 359         if (node) return node;
 360
 361         name1 = cf_section_name1(cs);
 362         name2 = cf_section_name2(cs);
 363
 364         /*
 365          *      Found the configuration entry.
 366          */
 367         node = rad_malloc(sizeof(*node));
 368         memset(node, 0, sizeof(*node));
 369
 370         node->insthandle = NULL;
 371
 372         /*
 373          *      Names in the "modules" section aren't prefixed
 374          *      with "rlm_", so we add it here.
 375          */
 376         snprintf(module_name, sizeof(module_name), "rlm_%s", name1);
 377
 378         node->entry = linkto_module(module_name, cs);
 379         if (!node->entry) {
 380                 free(node);
 381                 /* linkto_module logs any errors */
 382                 return NULL;
 383         }
 384
 385         if (check_config && (node->entry->module->instantiate) &&
 386             (node->entry->module->type & RLM_TYPE_CHECK_CONFIG_SAFE) == 0) {
 387                 cf_log_module(cs, "Skipping instantiation of %s", instname);
 388         } else {
 389                 cf_log_module(cs, "Instantiating %s", instname);
 390         }
 391
 392         /*
 393          *      Call the module's instantiation routine.
 394          */
 395         if ((node->entry->module->instantiate) &&
 396             (!check_config ||
 397              ((node->entry->module->type & RLM_TYPE_CHECK_CONFIG_SAFE) != 0)) &&
 398             ((node->entry->module->instantiate)(cs, &node->insthandle) < 0)) {
 399                 cf_log_err(cf_sectiontoitem(cs),
 400                            "Instantiation failed for module \"%s\"",
 401                            instname);
 402                 free(node);
 403                 return NULL;
 404         }
 405
 406         /*
 407          *      We're done.  Fill in the rest of the data structure,
 408          *      and link it to the module instance list.
 409          */
 410         strlcpy(node->name, instname, sizeof(node->name));
 411
 412 #ifdef HAVE_PTHREAD_H
 413         /*
 414          *      If we're threaded, check if the module is thread-safe.
 415          *
 416          *      If it isn't, we create a mutex.
 417          */
 418         if ((node->entry->module->type & RLM_TYPE_THREAD_UNSAFE) != 0) {
 419                 node->mutex = (pthread_mutex_t *) rad_malloc(sizeof(pthread_mutex_t));
 420                 /*
 421                  *      Initialize the mutex.
 422                  */
 423                 pthread_mutex_init(node->mutex, NULL);
 424         } else {
 425                 /*
 426                  *      The module is thread-safe.  Don't give it a mutex.
 427                  */
 428                 node->mutex = NULL;
 429         }
 430
 431 #endif
 432         rbtree_insert(instance_tree, node);
 433
 434         return node;
 435 }
 436
 437 static indexed_modcallable *lookup_by_index(const char *server, int comp,
 438                                             int idx)
 439 {
 440         indexed_modcallable myc;
 441
 442         myc.comp = comp;
 443         myc.idx = idx;
 444         myc.server = server;
 445
 446         return rbtree_finddata(components, &myc);
 447 }
 448
 449 /*
 450  *      Create a new sublist.
 451  */
 452 static indexed_modcallable *new_sublist(const char *server, int comp, int idx)
 453 {
 454         indexed_modcallable *c;
 455
 456         c = lookup_by_index(server, comp, idx);
 457
 458         /* It is an error to try to create a sublist that already
 459          * exists. It would almost certainly be caused by accidental
 460          * duplication in the config file.
 461          *
 462          * index 0 is the exception, because it is used when we want
 463          * to collect _all_ listed modules under a single index by
 464          * default, which is currently the case in all components
 465          * except authenticate. */
 466         if (c) {
 467                 if (idx == 0) {
 468                         return c;
 469                 }
 470                 return NULL;
 471         }
 472
 473         c = rad_malloc(sizeof(*c));
 474         c->modulelist = NULL;
 475         c->server = server;
 476         c->comp = comp;
 477         c->idx = idx;
 478
 479         if (!rbtree_insert(components, c)) {
 480                 free(c);
 481                 return NULL;
 482         }
 483
 484         return c;
 485 }
 486
 487 int indexed_modcall(int comp, int idx, REQUEST *request)
 488 {
 489         int rcode;
 490         indexed_modcallable *this;
 491         modcallable *list = NULL;
 492
 493         this = lookup_by_index(request->server, comp, idx);
 494         if (!this) {
 495                 if (idx != 0) DEBUG2("  WARNING: Unknown value specified for %s.  Cannot perform requested action.",
 496                                      section_type_value[comp].typename);
 497         } else {
 498                 list = this->modulelist;
 499         }
 500
 501         request->component = section_type_value[comp].section;
 502
 503         rcode = modcall(comp, list, request);
 504
 505         request->module = "";
 506         request->component = "";
 507         return rcode;
 508 }
 509
 510 /*
 511  *      Load a sub-module list, as found inside an Auth-Type foo {}
 512  *      block
 513  */
 514 static int load_subcomponent_section(modcallable *parent, CONF_SECTION *cs,
 515                                      const char *server, int attr, int comp)
 516 {
 517         indexed_modcallable *subcomp;
 518         modcallable *ml;
 519         DICT_VALUE *dval;
 520         const char *name2 = cf_section_name2(cs);
 521
 522         rad_assert(comp >= RLM_COMPONENT_AUTH);
 523         rad_assert(comp <= RLM_COMPONENT_COUNT);
 524
 525         /*
 526          *      Sanity check.
 527          */
 528         if (!name2) {
 529                 cf_log_err(cf_sectiontoitem(cs),
 530                            "No name specified for %s block",
 531                            section_type_value[comp].typename);
 532                 return 1;
 533         }
 534
 535         /*
 536          *      Compile the group.
 537          */
 538         ml = compile_modgroup(parent, comp, cs);
 539         if (!ml) {
 540                 return 0;
 541         }
 542
 543         /*
 544          *      We must assign a numeric index to this subcomponent.
 545          *      It is generated and placed in the dictionary
 546          *      automatically.  If it isn't found, it's a serious
 547          *      error.
 548          */
 549         dval = dict_valbyname(attr, name2);
 550         if (!dval) {
 551                 cf_log_err(cf_sectiontoitem(cs),
 552                            "%s %s Not previously configured",
 553                            section_type_value[comp].typename, name2);
 554                 modcallable_free(&ml);
 555                 return 0;
 556         }
 557
 558         subcomp = new_sublist(server, comp, dval->value);
 559         if (!subcomp) {
 560                 modcallable_free(&ml);
 561                 return 1;
 562         }
 563
 564         subcomp->modulelist = ml;
 565         return 1;               /* OK */
 566 }
 567
 568 static int define_type(const DICT_ATTR *dattr, const char *name)
 569 {
 570         uint32_t value;
 571         DICT_VALUE *dval;
 572
 573         /*
 574          *      If the value already exists, don't
 575          *      create it again.
 576          */
 577         dval = dict_valbyname(dattr->attr, name);
 578         if (dval) return 1;
 579
 580         /*
 581          *      Create a new unique value with a
 582          *      meaningless number.  You can't look at
 583          *      it from outside of this code, so it
 584          *      doesn't matter.  The only requirement
 585          *      is that it's unique.
 586          */
 587         do {
 588                 value = fr_rand() & 0x00ffffff;
 589         } while (dict_valbyattr(dattr->attr, value));
 590
 591         if (dict_addvalue(name, dattr->name, value) < 0) {
 592                 radlog(L_ERR, "%s", fr_strerror());
 593                 return 0;
 594         }
 595
 596         return 1;
 597 }
 598
 599 static int load_component_section(CONF_SECTION *cs,
 600                                   const char *server, int comp)
 601 {
 602         modcallable *this;
 603         CONF_ITEM *modref;
 604         int idx;
 605         indexed_modcallable *subcomp;
 606         const char *modname;
 607         const char *visiblename;
 608         const DICT_ATTR *dattr;
 609
 610         /*
 611          *      Find the attribute used to store VALUEs for this section.
 612          */
 613         dattr = dict_attrbyvalue(section_type_value[comp].attr);
 614         if (!dattr) {
 615                 cf_log_err(cf_sectiontoitem(cs),
 616                            "No such attribute %s",
 617                            section_type_value[comp].typename);
 618                 return -1;
 619         }
 620
 621         /*
 622          *      Loop over the entries in the named section, loading
 623          *      the sections this time.
 624          */
 625         for (modref = cf_item_find_next(cs, NULL);
 626              modref != NULL;
 627              modref = cf_item_find_next(cs, modref)) {
 628                 const char *name1;
 629                 CONF_PAIR *cp = NULL;
 630                 CONF_SECTION *scs = NULL;
 631
 632                 if (cf_item_is_section(modref)) {
 633                         scs = cf_itemtosection(modref);
 634
 635                         name1 = cf_section_name1(scs);
 636
 637                         if (strcmp(name1,
 638                                    section_type_value[comp].typename) == 0) {
 639                                 if (!load_subcomponent_section(NULL, scs,
 640                                                                server,
 641                                                                dattr->attr,
 642                                                                comp)) {
 643                                         return -1; /* FIXME: memleak? */
 644                                 }
 645                                 continue;
 646                         }
 647
 648                         cp = NULL;
 649
 650                 } else if (cf_item_is_pair(modref)) {
 651                         cp = cf_itemtopair(modref);
 652
 653                 } else {
 654                         continue; /* ignore it */
 655                 }
 656
 657                 /*
 658                  *      Try to compile one entry.
 659                  */
 660                 this = compile_modsingle(NULL, comp, modref, &modname);
 661                 if (!this) {
 662                         cf_log_err(cf_sectiontoitem(cs),
 663                                    "Errors parsing %s section.\n",
 664                                    cf_section_name1(cs));
 665                         return -1;
 666                 }
 667
 668                 /*
 669                  *      Look for Auth-Type foo {}, which are special
 670                  *      cases of named sections, and allowable ONLY
 671                  *      at the top-level.
 672                  *
 673                  *      i.e. They're not allowed in a "group" or "redundant"
 674                  *      subsection.
 675                  */
 676                 if (comp == RLM_COMPONENT_AUTH) {
 677                         DICT_VALUE *dval;
 678                         const char *modrefname = NULL;
 679                         if (cp) {
 680                                 modrefname = cf_pair_attr(cp);
 681                         } else {
 682                                 modrefname = cf_section_name2(scs);
 683                                 if (!modrefname) {
 684                                         modcallable_free(&this);
 685                                         cf_log_err(cf_sectiontoitem(cs),
 686                                                    "Errors parsing %s sub-section.\n",
 687                                                    cf_section_name1(scs));
 688                                         return -1;
 689                                 }
 690                         }
 691
 692                         dval = dict_valbyname(PW_AUTH_TYPE, modrefname);
 693                         if (!dval) {
 694                                 /*
 695                                  *      It's a section, but nothing we
 696                                  *      recognize.  Die!
 697                                  */
 698                                 modcallable_free(&this);
 699                                 cf_log_err(cf_sectiontoitem(cs),
 700                                            "Unknown Auth-Type \"%s\" in %s sub-section.",
 701                                            modrefname, section_type_value[comp].section);
 702                                 return -1;
 703                         }
 704                         idx = dval->value;
 705                 } else {
 706                         /* See the comment in new_sublist() for explanation
 707                          * of the special index 0 */
 708                         idx = 0;
 709                 }
 710
 711                 subcomp = new_sublist(server, comp, idx);
 712                 if (subcomp == NULL) {
 713                         modcallable_free(&this);
 714                         continue;
 715                 }
 716
 717                 /* If subcomp->modulelist is NULL, add_to_modcallable will
 718                  * create it */
 719                 visiblename = cf_section_name2(cs);
 720                 if (visiblename == NULL)
 721                         visiblename = cf_section_name1(cs);
 722                 add_to_modcallable(&subcomp->modulelist, this,
 723                                    comp, visiblename);
 724         }
 725
 726         return 0;
 727 }
 728
 729 static int load_byserver(CONF_SECTION *cs)
 730 {
 731         int comp, flag;
 732         const char *server = cf_section_name2(cs);
 733
 734         cf_log_info(cs, " modules {");
 735
 736         /*
 737          *      Define types first.
 738          */
 739         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
 740                 CONF_SECTION *subcs;
 741                 CONF_ITEM *modref;
 742                 DICT_ATTR *dattr;
 743
 744                 subcs = cf_section_sub_find(cs,
 745                                             section_type_value[comp].section);
 746                 if (!subcs) continue;
 747
 748                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
 749
 750                 /*
 751                  *      Find the attribute used to store VALUEs for this section.
 752                  */
 753                 dattr = dict_attrbyvalue(section_type_value[comp].attr);
 754                 if (!dattr) {
 755                         cf_log_err(cf_sectiontoitem(subcs),
 756                                    "No such attribute %s",
 757                                    section_type_value[comp].typename);
 758                         cf_log_info(cs, " }");
 759                         return -1;
 760                 }
 761
 762                 /*
 763                  *      Define dynamic types, so that others can reference
 764                  *      them.
 765                  */
 766                 for (modref = cf_item_find_next(subcs, NULL);
 767                      modref != NULL;
 768                      modref = cf_item_find_next(subcs, modref)) {
 769                         const char *name1;
 770                         CONF_SECTION *subsubcs;
 771
 772                         /*
 773                          *      Create types for simple references
 774                          *      only when parsing the authenticate
 775                          *      section.
 776                          */
 777                         if ((section_type_value[comp].attr == PW_AUTH_TYPE) &&
 778                             cf_item_is_pair(modref)) {
 779                                 CONF_PAIR *cp = cf_itemtopair(modref);
 780                                 if (!define_type(dattr, cf_pair_attr(cp))) {
 781                                         return -1;
 782                                 }
 783
 784                                 continue;
 785                         }
 786
 787                         if (!cf_item_is_section(modref)) continue;
 788
 789                         subsubcs = cf_itemtosection(modref);
 790                         name1 = cf_section_name1(subsubcs);
 791
 792                         if (strcmp(name1, section_type_value[comp].typename) == 0) {
 793                                 if (!define_type(dattr,
 794                                                  cf_section_name2(subsubcs))) {
 795                                         cf_log_info(cs, " }");
 796                                         return -1;
 797                                 }
 798                         }
 799                 }
 800         } /* loop over components */
 801
 802         /*
 803          *      Loop over all of the known components, finding their
 804          *      configuration section, and loading it.
 805          */
 806         flag = 0;
 807         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
 808                 CONF_SECTION *subcs;
 809
 810                 subcs = cf_section_sub_find(cs,
 811                                             section_type_value[comp].section);
 812                 if (!subcs) continue;
 813
 814                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
 815
 816                 cf_log_module(cs, "Checking %s {...} for more modules to load",
 817                        section_type_value[comp].section);
 818
 819                 if (load_component_section(subcs, server, comp) < 0) {
 820                         cf_log_info(cs, " }");
 821                         return -1;
 822                 }
 823                 flag = 1;
 824         } /* loop over components */
 825
 826         /*
 827          *      We haven't loaded any of the normal sections.  Maybe we're
 828          *      supposed to load the vmps section.
 829          *
 830          *      This is a bit of a hack...
 831          */
 832         if (!flag) {
 833                 CONF_SECTION *subcs;
 834
 835                 subcs = cf_section_sub_find(cs, "vmps");
 836                 if (subcs) {
 837                         cf_log_module(cs, "Checking vmps {...} for more modules to load");
 838                         if (load_component_section(subcs, server,
 839                                                    RLM_COMPONENT_POST_AUTH) < 0) {
 840                                 return -1;
 841                         }
 842                         flag = 1;
 843                 }
 844
 845 #ifdef WITH_DHCP
 846                 if (!flag) {
 847                         const DICT_ATTR *dattr;
 848
 849                         dattr = dict_attrbyname("DHCP-Message-Type");
 850                         if (!dattr) {
 851                                 radlog(L_ERR, "No DHCP-Message-Type attribute");
 852                                 return -1;
 853                         }
 854
 855                         /*
 856                          *      Handle each DHCP Message type separately.
 857                          */
 858                         for (subcs = cf_subsection_find_next(cs, NULL,
 859                                                              "dhcp");
 860                              subcs != NULL;
 861                              subcs = cf_subsection_find_next(cs, subcs,
 862                                                              "dhcp")) {
 863                                 const char *name2 = cf_section_name2(subcs);
 864
 865                                 DEBUG2(" Module: Checking dhcp %s {...} for more modules to load", name2);
 866                                 if (!load_subcomponent_section(NULL, subcs,
 867                                                                server,
 868                                                                dattr->attr,
 869                                                                RLM_COMPONENT_POST_AUTH)) {
 870                                         return -1; /* FIXME: memleak? */
 871                                 }
 872                                 flag = 1;
 873                         }
 874                 }
 875 #endif
 876         }
 877
 878         cf_log_info(cs, " }");
 879
 880         if (!flag && server) {
 881                 DEBUG("WARNING: Server %s is empty, and will do nothing!",
 882                       server);
 883         }
 884
 885         return 0;
 886 }
 887
 888
 889 int module_hup(CONF_SECTION *modules)
 890 {
 891         time_t when;
 892         CONF_ITEM *ci;
 893         CONF_SECTION *cs;
 894         module_instance_t *node;
 895
 896         static int insthandle_counter = -1;
 897         static time_t hup_times[16];
 898
 899         if (!modules) return 0;
 900
 901         if (insthandle_counter < 0) {
 902                 memset(hup_times, 0, sizeof(hup_times));
 903                 insthandle_counter = 0;
 904         }
 905
 906         when = time(NULL);
 907
 908         /*
 909          *      Loop over the modules
 910          */
 911         for (ci=cf_item_find_next(modules, NULL);
 912              ci != NULL;
 913              ci=cf_item_find_next(modules, ci)) {
 914                 int i;
 915                 void *insthandle = NULL;
 916                 const char *instname;
 917                 module_instance_t myNode;
 918
 919                 /*
 920                  *      If it's not a section, ignore it.
 921                  */
 922                 if (!cf_item_is_section(ci)) continue;
 923
 924                 cs = cf_itemtosection(ci);
 925                 instname = cf_section_name2(cs);
 926                 if (!instname) instname = cf_section_name1(cs);
 927
 928                 strlcpy(myNode.name, instname, sizeof(myNode.name));
 929                 node = rbtree_finddata(instance_tree, &myNode);
 930                 if (!node ||
 931                     !node->entry->module->instantiate ||
 932                     ((node->entry->module->type & RLM_TYPE_HUP_SAFE) == 0)) {
 933                         continue;
 934                 }
 935
 936                 cf_log_module(cs, "Trying to reload module \"%s\"", node->name);
 937
 938                 if ((node->entry->module->instantiate)(cs, &insthandle) < 0) {
 939                         cf_log_err(cf_sectiontoitem(cs),
 940                                    "HUP failed for module \"%s\".  Using old configuration.",
 941                                    node->name);
 942                         continue;
 943                 }
 944
 945                 radlog(L_INFO, " Module: Reloaded module \"%s\"", node->name);
 946
 947                 /*
 948                  *      Free all configurations old enough to be
 949                  *      deleted.  This is slightly wasteful, but easy
 950                  *      to do.
 951                  *
 952                  *      We permit HUPs every 5s, and we cache the last
 953                  *      16 configurations.  So the current entry at
 954                  *      insthandle_counter will either be empty, OR will
 955                  *      be at least (5*16) = 80s old.  The following check
 956                  *      ensures that it will be deleted.
 957                  */
 958                 for (i = 0; i < 16; i++) {
 959                         if ((int) (when - hup_times[insthandle_counter]) < 60)
 960                                 continue;
 961
 962                         if (!node->old_insthandle[i]) continue;
 963
 964                         cf_section_parse_free(cs, node->old_insthandle[i]);
 965
 966                         if (node->entry->module->detach) {
 967                                 (node->entry->module->detach)(node->old_insthandle[i]);
 968                         }
 969                         node->old_insthandle[i] = NULL;
 970                 }
 971
 972                 /*
 973                  *      Save the old instance handle for later deletion.
 974                  */
 975                 node->old_insthandle[insthandle_counter] = node->insthandle;
 976                 node->insthandle = insthandle;
 977
 978                 /*
 979                  *      FIXME: Set a timeout to come back in 60s, so that
 980                  *      we can pro-actively clean up the old instances.
 981                  */
 982         }
 983
 984         /*
 985          *      Remember when we were last HUP'd.
 986          */
 987         hup_times[insthandle_counter] = when;
 988         insthandle_counter++;
 989         insthandle_counter &= 0x0f;
 990
 991         return 1;
 992 }
 993
 994
 995 /*
 996  *      Parse the module config sections, and load
 997  *      and call each module's init() function.
 998  *
 999  *      Libtool makes your life a LOT easier, especially with libltdl.
1000  *      see: http://www.gnu.org/software/libtool/
1001  */
1002 int setup_modules(int reload, CONF_SECTION *config)
1003 {
1004         CONF_SECTION    *cs, *modules;
1005         rad_listen_t    *listener;
1006         int             null_server = FALSE;
1007
1008         if (reload) return 0;
1009
1010         /*
1011          *      If necessary, initialize libltdl.
1012          */
1013         if (!reload) {
1014                 /*
1015                  *      Set the default list of preloaded symbols.
1016                  *      This is used to initialize libltdl's list of
1017                  *      preloaded modules.
1018                  *
1019                  *      i.e. Static modules.
1020                  */
1021                 LTDL_SET_PRELOADED_SYMBOLS();
1022
1023                 if (lt_dlinit() != 0) {
1024                         radlog(L_ERR, "Failed to initialize libraries: %s\n",
1025                                         lt_dlerror());
1026                         return -1;
1027                 }
1028
1029                 /*
1030                  *      Set the search path to ONLY our library directory.
1031                  *      This prevents the modules from being found from
1032                  *      any location on the disk.
1033                  */
1034                 lt_dlsetsearchpath(radlib_dir);
1035
1036                 /*
1037                  *      Set up the internal module struct.
1038                  */
1039                 module_tree = rbtree_create(module_entry_cmp,
1040                                             module_entry_free, 0);
1041                 if (!module_tree) {
1042                         radlog(L_ERR, "Failed to initialize modules\n");
1043                         return -1;
1044                 }
1045
1046                 instance_tree = rbtree_create(module_instance_cmp,
1047                                               module_instance_free, 0);
1048                 if (!instance_tree) {
1049                         radlog(L_ERR, "Failed to initialize modules\n");
1050                         return -1;
1051                 }
1052         }
1053
1054         components = rbtree_create(indexed_modcallable_cmp,
1055                                    indexed_modcallable_free, 0);
1056         if (!components) {
1057                 radlog(L_ERR, "Failed to initialize components\n");
1058                 return -1;
1059         }
1060
1061         /*
1062          *      Remember where the modules were stored.
1063          */
1064         modules = cf_section_sub_find(config, "modules");
1065         if (!modules) {
1066                 radlog(L_ERR, "Cannot find a \"modules\" section in the configuration file!");
1067                 return -1;
1068         }
1069
1070         DEBUG2("%s: #### Instantiating modules ####", mainconfig.name);
1071
1072         /*
1073          *  Look for the 'instantiate' section, which tells us
1074          *  the instantiation order of the modules, and also allows
1075          *  us to load modules with no authorize/authenticate/etc.
1076          *  sections.
1077          */
1078         cs = cf_section_sub_find(config, "instantiate");
1079         if (cs != NULL) {
1080                 CONF_ITEM *ci;
1081                 CONF_PAIR *cp;
1082                 module_instance_t *module;
1083                 const char *name;
1084
1085                 cf_log_info(cs, " instantiate {");
1086
1087                 /*
1088                  *  Loop over the items in the 'instantiate' section.
1089                  */
1090                 for (ci=cf_item_find_next(cs, NULL);
1091                      ci != NULL;
1092                      ci=cf_item_find_next(cs, ci)) {
1093
1094                         /*
1095                          *      Skip sections and "other" stuff.
1096                          *      Sections will be handled later, if
1097                          *      they're referenced at all...
1098                          */
1099                         if (!cf_item_is_pair(ci)) {
1100                                 continue;
1101                         }
1102
1103                         cp = cf_itemtopair(ci);
1104                         name = cf_pair_attr(cp);
1105                         module = find_module_instance(modules, name);
1106                         if (!module) {
1107                                 return -1;
1108                         }
1109                 } /* loop over items in the subsection */
1110
1111                 cf_log_info(cs, " }");
1112         } /* if there's an 'instantiate' section. */
1113
1114         /*
1115          *      Loop over the listeners, figuring out which sections
1116          *      to load.
1117          */
1118         for (listener = mainconfig.listen;
1119              listener != NULL;
1120              listener = listener->next) {
1121                 char buffer[256];
1122
1123                 if (listener->type == RAD_LISTEN_PROXY) continue;
1124
1125                 cs = cf_section_sub_find_name2(config,
1126                                                "server", listener->server);
1127                 if (!cs && (listener->server != NULL)) {
1128                         listener->print(listener, buffer, sizeof(buffer));
1129
1130                         radlog(L_ERR, "No server has been defined for %s", buffer);
1131                         return -1;
1132                 }
1133         }
1134
1135         DEBUG2("%s: #### Loading Virtual Servers ####", mainconfig.name);
1136
1137         /*
1138          *      Load all of the virtual servers.
1139          */
1140         for (cs = cf_subsection_find_next(config, NULL, "server");
1141              cs != NULL;
1142              cs = cf_subsection_find_next(config, cs, "server")) {
1143                 const char *name2 = cf_section_name2(cs);
1144
1145                 if (name2) {
1146                         cf_log_info(cs, "server %s {", name2);
1147                 } else {
1148                         cf_log_info(cs, "server {");
1149                         null_server = TRUE;
1150                 }
1151                 if (load_byserver(cs) < 0) {
1152                         cf_log_info(cs, "}");
1153                         return -1;
1154                 }
1155                 cf_log_info(cs, "}");
1156         }
1157
1158         /*
1159          *      No empty server defined.  Try to load an old-style
1160          *      one for backwards compatibility.
1161          */
1162         if (!null_server) {
1163                 cf_log_info(cs, "server {");
1164                 if (load_byserver(config) < 0) {
1165                         cf_log_info(cs, "}");
1166                         return -1;
1167                 }
1168                 cf_log_info(cs, "}");
1169         }
1170
1171         return 0;
1172 }
1173
1174 /*
1175  *      Call all authorization modules until one returns
1176  *      somethings else than RLM_MODULE_OK
1177  */
1178 int module_authorize(int autz_type, REQUEST *request)
1179 {
1180         return indexed_modcall(RLM_COMPONENT_AUTZ, autz_type, request);
1181 }
1182
1183 /*
1184  *      Authenticate a user/password with various methods.
1185  */
1186 int module_authenticate(int auth_type, REQUEST *request)
1187 {
1188         return indexed_modcall(RLM_COMPONENT_AUTH, auth_type, request);
1189 }
1190
1191 #ifdef WITH_ACCOUNTING
1192 /*
1193  *      Do pre-accounting for ALL configured sessions
1194  */
1195 int module_preacct(REQUEST *request)
1196 {
1197         return indexed_modcall(RLM_COMPONENT_PREACCT, 0, request);
1198 }
1199
1200 /*
1201  *      Do accounting for ALL configured sessions
1202  */
1203 int module_accounting(int acct_type, REQUEST *request)
1204 {
1205         return indexed_modcall(RLM_COMPONENT_ACCT, acct_type, request);
1206 }
1207 #endif
1208
1209 #ifdef WITH_SESSION_MGMT
1210 /*
1211  *      See if a user is already logged in.
1212  *
1213  *      Returns: 0 == OK, 1 == double logins, 2 == multilink attempt
1214  */
1215 int module_checksimul(int sess_type, REQUEST *request, int maxsimul)
1216 {
1217         int rcode;
1218
1219         if(!request->username)
1220                 return 0;
1221
1222         request->simul_count = 0;
1223         request->simul_max = maxsimul;
1224         request->simul_mpp = 1;
1225
1226         rcode = indexed_modcall(RLM_COMPONENT_SESS, sess_type, request);
1227
1228         if (rcode != RLM_MODULE_OK) {
1229                 /* FIXME: Good spot for a *rate-limited* warning to the log */
1230                 return 0;
1231         }
1232
1233         return (request->simul_count < maxsimul) ? 0 : request->simul_mpp;
1234 }
1235 #endif
1236
1237 #ifdef WITH_PROXY
1238 /*
1239  *      Do pre-proxying for ALL configured sessions
1240  */
1241 int module_pre_proxy(int type, REQUEST *request)
1242 {
1243         return indexed_modcall(RLM_COMPONENT_PRE_PROXY, type, request);
1244 }
1245
1246 /*
1247  *      Do post-proxying for ALL configured sessions
1248  */
1249 int module_post_proxy(int type, REQUEST *request)
1250 {
1251         return indexed_modcall(RLM_COMPONENT_POST_PROXY, type, request);
1252 }
1253 #endif
1254
1255 /*
1256  *      Do post-authentication for ALL configured sessions
1257  */
1258 int module_post_auth(int postauth_type, REQUEST *request)
1259 {
1260         return indexed_modcall(RLM_COMPONENT_POST_AUTH, postauth_type, request);
1261 }