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 #define VMPS_SPACE "vmps"
  34
  35 typedef struct indexed_modcallable {
  36         const           char *space;
  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;
  46
  47 static rbtree_t *module_tree = NULL;
  48
  49 typedef struct section_type_value_t {
  50         const char      *section;
  51         const char      *typename;
  52         int             attr;
  53 } section_type_value_t;
  54
  55
  56 /*
  57  *      Ordered by component
  58  */
  59 static const section_type_value_t section_type_value[RLM_COMPONENT_COUNT] = {
  60         { "authenticate", "Auth-Type",       PW_AUTH_TYPE },
  61         { "authorize",    "Autz-Type",       PW_AUTZ_TYPE },
  62         { "preacct",      "Pre-Acct-Type",   PW_PRE_ACCT_TYPE },
  63         { "accounting",   "Acct-Type",       PW_ACCT_TYPE },
  64         { "session",      "Session-Type",    PW_SESSION_TYPE },
  65         { "pre-proxy",    "Pre-Proxy-Type",  PW_PRE_PROXY_TYPE },
  66         { "post-proxy",   "Post-Proxy-Type", PW_POST_PROXY_TYPE },
  67         { "post-auth",    "Post-Auth-Type",  PW_POST_AUTH_TYPE },
  68 };
  69
  70 static void indexed_modcallable_free(void *data)
  71 {
  72         indexed_modcallable *c = data;
  73
  74         modcallable_free(&c->modulelist);
  75         free(c);
  76 }
  77
  78 static int indexed_modcallable_cmp(const void *one, const void *two)
  79 {
  80         int rcode;
  81         const indexed_modcallable *a = one;
  82         const indexed_modcallable *b = two;
  83
  84         if (a->space && !b->space) return -1;
  85         if (!a->space && b->space) return +1;
  86         if (a->space && b->space) {
  87                 rcode = strcmp(a->space, b->space);
  88                 if (rcode != 0) return rcode;
  89         }
  90
  91         if (a->comp < b->comp) return -1;
  92         if (a->comp >  b->comp) return +1;
  93
  94         return a->idx - b->idx;
  95 }
  96
  97
  98 /*
  99  *      Free a module instance.
 100  */
 101 static void module_instance_free(void *data)
 102 {
 103         module_instance_t *this = data;
 104
 105         if (this->entry->module->detach)
 106                 (this->entry->module->detach)(this->insthandle);
 107 #ifdef HAVE_PTHREAD_H
 108         if (this->mutex) {
 109                 /*
 110                  *      FIXME
 111                  *      The mutex MIGHT be locked...
 112                  *      we'll check for that later, I guess.
 113                  */
 114                 pthread_mutex_destroy(this->mutex);
 115                 free(this->mutex);
 116         }
 117 #endif
 118         free(this);
 119 }
 120
 121
 122 /*
 123  *      Compare two module entries
 124  */
 125 static int module_entry_cmp(const void *one, const void *two)
 126 {
 127         const module_entry_t *a = one;
 128         const module_entry_t *b = two;
 129
 130         return strcmp(a->name, b->name);
 131 }
 132
 133 /*
 134  *      Free a module entry.
 135  */
 136 static void module_entry_free(void *data)
 137 {
 138         module_entry_t *this = data;
 139
 140         lt_dlclose(this->handle);       /* ignore any errors */
 141         free(this);
 142 }
 143
 144
 145 /*
 146  *      Remove the module lists.
 147  */
 148 int detach_modules(void)
 149 {
 150         rbtree_free(components);
 151         rbtree_free(module_tree);
 152
 153         return 0;
 154 }
 155
 156
 157 /*
 158  *      Find a module on disk or in memory, and link to it.
 159  */
 160 static module_entry_t *linkto_module(const char *module_name,
 161                                      const char *cffilename, int cflineno)
 162 {
 163         module_entry_t myentry;
 164         module_entry_t *node;
 165         lt_dlhandle handle;
 166         char module_struct[256];
 167         char *p;
 168         const void *module;
 169
 170         strlcpy(myentry.name, module_name, sizeof(myentry.name));
 171         node = rbtree_finddata(module_tree, &myentry);
 172         if (node) return node;
 173
 174         /*
 175          *      Keep the handle around so we can dlclose() it.
 176          */
 177         handle = lt_dlopenext(module_name);
 178         if (handle == NULL) {
 179                 radlog(L_ERR|L_CONS, "%s[%d]: Failed to link to module '%s':"
 180                        " %s\n", cffilename, cflineno, module_name, lt_dlerror());
 181                 return NULL;
 182         }
 183
 184         /*
 185          *      Link to the module's rlm_FOO{} module structure.
 186          *
 187          *      The module_name variable has the version number
 188          *      embedded in it, and we don't want that here.
 189          */
 190         strcpy(module_struct, module_name);
 191         p = strrchr(module_struct, '-');
 192         if (p) *p = '\0';
 193
 194         DEBUG3("    (Loaded %s, checking if it's valid)", module_name);
 195
 196         /*
 197          *      libltld MAY core here, if the handle it gives us contains
 198          *      garbage data.
 199          */
 200         module = lt_dlsym(handle, module_struct);
 201         if (!module) {
 202                 radlog(L_ERR|L_CONS, "%s[%d]: Failed linking to "
 203                                 "%s structure in %s: %s\n",
 204                                 cffilename, cflineno,
 205                                 module_name, cffilename, lt_dlerror());
 206                 lt_dlclose(handle);
 207                 return NULL;
 208         }
 209         /*
 210          *      Before doing anything else, check if it's sane.
 211          */
 212         if ((*(const uint32_t *) module) != RLM_MODULE_MAGIC_NUMBER) {
 213                 lt_dlclose(handle);
 214                 radlog(L_ERR|L_CONS, "%s[%d]: Invalid version in module '%s'",
 215                        cffilename, cflineno, module_name);
 216                 return NULL;
 217
 218         }
 219
 220         /* make room for the module type */
 221         node = rad_malloc(sizeof(*node));
 222         memset(node, 0, sizeof(*node));
 223         strlcpy(node->name, module_name, sizeof(node->name));
 224         node->module = module;
 225         node->handle = handle;
 226
 227         DEBUG(" Module: Linked to module %s", module_name);
 228
 229         /*
 230          *      Add the module as "rlm_foo-version" to the configuration
 231          *      section.
 232          */
 233         if (!rbtree_insert(module_tree, node)) {
 234                 radlog(L_ERR, "Failed to cache module %s", module_name);
 235                 lt_dlclose(handle);
 236                 free(node);
 237                 return NULL;
 238         }
 239
 240         return node;
 241 }
 242
 243 /*
 244  *      Find a module instance.
 245  */
 246 module_instance_t *find_module_instance(CONF_SECTION *modules,
 247                                         const char *instname)
 248 {
 249         CONF_SECTION *cs;
 250         const char *name1, *name2;
 251         module_instance_t *node;
 252         char module_name[256];
 253
 254         if (!modules) return NULL;
 255
 256         /*
 257          *      Module instances are declared in the modules{} block
 258          *      and referenced later by their name, which is the
 259          *      name2 from the config section, or name1 if there was
 260          *      no name2.
 261          */
 262         cs = cf_section_sub_find_name2(modules, NULL, instname);
 263         if (cs == NULL) {
 264                 radlog(L_ERR|L_CONS, "ERROR: Cannot find a configuration entry for module \"%s\".\n", instname);
 265                 return NULL;
 266         }
 267
 268         /*
 269          *      If there's already a module instance, return it.
 270          */
 271         node = cf_data_find(cs, "instance");
 272         if (node) return node;
 273
 274         name1 = cf_section_name1(cs);
 275         name2 = cf_section_name2(cs);
 276
 277         /*
 278          *      Found the configuration entry.
 279          */
 280         node = rad_malloc(sizeof(*node));
 281         memset(node, 0, sizeof(*node));
 282
 283         node->insthandle = NULL;
 284
 285         /*
 286          *      Names in the "modules" section aren't prefixed
 287          *      with "rlm_", so we add it here.
 288          */
 289         snprintf(module_name, sizeof(module_name), "rlm_%s", name1);
 290
 291         node->entry = linkto_module(module_name,
 292                                     mainconfig.radiusd_conf,
 293                                     cf_section_lineno(cs));
 294         if (!node->entry) {
 295                 free(node);
 296                 /* linkto_module logs any errors */
 297                 return NULL;
 298         }
 299
 300         DEBUG2(" Module: Instantiating %s", instname);
 301
 302         /*
 303          *      Call the module's instantiation routine.
 304          */
 305         if ((node->entry->module->instantiate) &&
 306             ((node->entry->module->instantiate)(cs, &node->insthandle) < 0)) {
 307                 radlog(L_ERR|L_CONS,
 308                                 "%s[%d]: %s: Module instantiation failed.\n",
 309                        mainconfig.radiusd_conf, cf_section_lineno(cs),
 310                        instname);
 311                 free(node);
 312                 return NULL;
 313         }
 314
 315         /*
 316          *      We're done.  Fill in the rest of the data structure,
 317          *      and link it to the module instance list.
 318          */
 319         strlcpy(node->name, instname, sizeof(node->name));
 320
 321 #ifdef HAVE_PTHREAD_H
 322         /*
 323          *      If we're threaded, check if the module is thread-safe.
 324          *
 325          *      If it isn't, we create a mutex.
 326          */
 327         if ((node->entry->module->type & RLM_TYPE_THREAD_UNSAFE) != 0) {
 328                 node->mutex = (pthread_mutex_t *) rad_malloc(sizeof(pthread_mutex_t));
 329                 /*
 330                  *      Initialize the mutex.
 331                  */
 332                 pthread_mutex_init(node->mutex, NULL);
 333         } else {
 334                 /*
 335                  *      The module is thread-safe.  Don't give it a mutex.
 336                  */
 337                 node->mutex = NULL;
 338         }
 339
 340 #endif
 341         cf_data_add(cs, "instance", node, module_instance_free);
 342
 343         return node;
 344 }
 345
 346 static indexed_modcallable *lookup_by_index(const char *space, int comp,
 347                                             int idx)
 348 {
 349         indexed_modcallable myc;
 350
 351         myc.comp = comp;
 352         myc.idx = idx;
 353         myc.space = space;
 354
 355         return rbtree_finddata(components, &myc);
 356 }
 357
 358 /*
 359  *      Create a new sublist.
 360  */
 361 static indexed_modcallable *new_sublist(const char *space, int comp, int idx)
 362 {
 363         indexed_modcallable *c;
 364
 365         c = lookup_by_index(space, comp, idx);
 366
 367         /* It is an error to try to create a sublist that already
 368          * exists. It would almost certainly be caused by accidental
 369          * duplication in the config file.
 370          *
 371          * index 0 is the exception, because it is used when we want
 372          * to collect _all_ listed modules under a single index by
 373          * default, which is currently the case in all components
 374          * except authenticate. */
 375         if (c) {
 376                 if (idx == 0) {
 377                         return c;
 378                 }
 379                 return NULL;
 380         }
 381
 382         c = rad_malloc(sizeof(*c));
 383         c->modulelist = NULL;
 384         c->space = space;
 385         c->comp = comp;
 386         c->idx = idx;
 387
 388         if (!rbtree_insert(components, c)) {
 389                 free(c);
 390                 return NULL;
 391         }
 392
 393         return c;
 394 }
 395
 396 static int indexed_modcall(const char *space, int comp, int idx,
 397                            REQUEST *request)
 398 {
 399         int rcode;
 400         indexed_modcallable *this;
 401         modcallable *list = NULL;
 402
 403         this = lookup_by_index(space, comp, idx);
 404         if (!this) {
 405                 if (idx != 0) DEBUG2("  WARNING: Unknown value specified for %s.  Cannot perform requested action.",
 406                                      section_type_value[comp].typename);
 407         } else {
 408                 list = this->modulelist;
 409         }
 410
 411         request->component = section_type_value[comp].section;
 412
 413         rcode = modcall(comp, list, request);
 414
 415         request->module = "<server-core>";
 416         request->component = "<server-core>";
 417         return rcode;
 418 }
 419
 420 /*
 421  *      Load a sub-module list, as found inside an Auth-Type foo {}
 422  *      block
 423  */
 424 static int load_subcomponent_section(modcallable *parent, CONF_SECTION *cs,
 425                                      const char *space,
 426                                      int comp, const char *filename)
 427 {
 428         indexed_modcallable *subcomp;
 429         modcallable *ml;
 430         DICT_VALUE *dval;
 431         const char *name2 = cf_section_name2(cs);
 432
 433         rad_assert(comp >= RLM_COMPONENT_AUTH);
 434         rad_assert(comp <= RLM_COMPONENT_COUNT);
 435
 436         /*
 437          *      Sanity check.
 438          */
 439         if (!name2) {
 440                 radlog(L_ERR|L_CONS,
 441                        "%s[%d]: No name specified for %s block",
 442                        filename, cf_section_lineno(cs),
 443                        section_type_value[comp].typename);
 444                 return 1;
 445         }
 446
 447         /*
 448          *      Compile the group.
 449          */
 450         ml = compile_modgroup(parent, comp, cs, filename);
 451         if (!ml) {
 452                 return 0;
 453         }
 454
 455         /*
 456          *      We must assign a numeric index to this subcomponent.
 457          *      It is generated and placed in the dictionary by
 458          *      setup_modules(), when it loads the sections.  If it
 459          *      isn't found, it's a serious error.
 460          */
 461         dval = dict_valbyname(section_type_value[comp].attr, name2);
 462         if (!dval) {
 463                 radlog(L_ERR|L_CONS,
 464                        "%s[%d]: %s %s Not previously configured",
 465                        filename, cf_section_lineno(cs),
 466                        section_type_value[comp].typename, name2);
 467                 modcallable_free(&ml);
 468                 return 0;
 469         }
 470
 471         subcomp = new_sublist(space, comp, dval->value);
 472         if (!subcomp) {
 473                 modcallable_free(&ml);
 474                 return 1;
 475         }
 476
 477         subcomp->modulelist = ml;
 478         return 1;               /* OK */
 479 }
 480
 481 static int load_component_section(modcallable *parent, CONF_SECTION *cs,
 482                                   const char *space, int comp,
 483                                   const char *filename)
 484 {
 485         modcallable *this;
 486         CONF_ITEM *modref;
 487         int idx;
 488         indexed_modcallable *subcomp;
 489         const char *modname;
 490         const char *visiblename;
 491
 492         /*
 493          *      Loop over the entries in the named section.
 494          */
 495         for (modref = cf_item_find_next(cs, NULL);
 496              modref != NULL;
 497              modref = cf_item_find_next(cs, modref)) {
 498                 CONF_PAIR *cp = NULL;
 499                 CONF_SECTION *scs = NULL;
 500
 501                 /*
 502                  *      Look for Auth-Type foo {}, which are special
 503                  *      cases of named sections, and allowable ONLY
 504                  *      at the top-level.
 505                  *
 506                  *      i.e. They're not allowed in a "group" or "redundant"
 507                  *      subsection.
 508                  */
 509                 if (cf_item_is_section(modref)) {
 510                         const char *sec_name;
 511                         scs = cf_itemtosection(modref);
 512
 513                         sec_name = cf_section_name1(scs);
 514
 515                         if (strcmp(sec_name,
 516                                    section_type_value[comp].typename) == 0) {
 517                                 if (!load_subcomponent_section(parent, scs,
 518                                                                space, comp,
 519                                                                filename)) {
 520                                         return -1; /* FIXME: memleak? */
 521                                 }
 522                                 continue;
 523                         }
 524
 525                         cp = NULL;
 526                 } else if (cf_item_is_pair(modref)) {
 527                         cp = cf_itemtopair(modref);
 528                 } else {
 529                         continue; /* ignore it */
 530                 }
 531
 532                 /*
 533                  *      Try to compile one entry.
 534                  */
 535                 this = compile_modsingle(parent, comp, modref, filename,
 536                                          &modname);
 537                 if (!this) {
 538                         radlog(L_ERR|L_CONS,
 539                                "%s[%d]: Failed to parse %s section.\n",
 540                                filename, cf_section_lineno(cs),
 541                                cf_section_name1(cs));
 542                         return -1;
 543                 }
 544
 545                 if (comp == RLM_COMPONENT_AUTH) {
 546                         DICT_VALUE *dval;
 547                         const char *modrefname = NULL;
 548                         int lineno = 0;
 549
 550                         if (cp) {
 551                                 modrefname = cf_pair_attr(cp);
 552                                 lineno = cf_pair_lineno(cp);
 553                         } else {
 554                                 modrefname = cf_section_name2(scs);
 555                                 lineno = cf_section_lineno(scs);
 556                                 if (!modrefname) {
 557                                         radlog(L_ERR|L_CONS,
 558                                                "%s[%d]: Failed to parse %s sub-section.\n",
 559                                                filename, lineno,
 560                                                cf_section_name1(scs));
 561                                         return -1;
 562                                 }
 563                         }
 564
 565                         dval = dict_valbyname(PW_AUTH_TYPE, modrefname);
 566                         if (!dval) {
 567                                 /*
 568                                  *      It's a section, but nothing we
 569                                  *      recognize.  Die!
 570                                  */
 571                                 radlog(L_ERR|L_CONS, "%s[%d]: Unknown Auth-Type \"%s\" in %s sub-section.",
 572                                        filename, lineno,
 573                                        modrefname, section_type_value[comp].section);
 574                                 return -1;
 575                         }
 576                         idx = dval->value;
 577                 } else {
 578                         /* See the comment in new_sublist() for explanation
 579                          * of the special index 0 */
 580                         idx = 0;
 581                 }
 582
 583                 subcomp = new_sublist(space, comp, idx);
 584                 if (subcomp == NULL) {
 585                         modcallable_free(&this);
 586                         continue;
 587                 }
 588
 589                 /* If subcomp->modulelist is NULL, add_to_modcallable will
 590                  * create it */
 591                 visiblename = cf_section_name2(cs);
 592                 if (visiblename == NULL)
 593                         visiblename = cf_section_name1(cs);
 594                 add_to_modcallable(&subcomp->modulelist, this,
 595                                    comp, visiblename);
 596         }
 597
 598         return 0;
 599 }
 600
 601 static int load_byspace(CONF_SECTION *cs, const char *space,
 602                         int *do_component)
 603 {
 604         int comp;
 605
 606         /*
 607          *      Create any DICT_VALUE's for the types.  See
 608          *      'doc/configurable_failover' for examples of 'authtype'
 609          *      used to create new Auth-Type values.  In order to
 610          *      let the user create new names, we've got to look for
 611          *      those names, and create DICT_VALUE's for them.
 612          */
 613         for (comp = RLM_COMPONENT_AUTH; comp < RLM_COMPONENT_COUNT; comp++) {
 614                 int             value;
 615                 const char      *name2;
 616                 DICT_ATTR       *dattr;
 617                 DICT_VALUE      *dval;
 618                 CONF_SECTION    *subcs;
 619                 CONF_ITEM       *ci;
 620
 621                 /*
 622                  *      Not needed, don't load it.
 623                  */
 624                 if (!do_component[comp]) {
 625                         continue;
 626                 }
 627                 subcs = cf_section_sub_find(cs,
 628                                             section_type_value[comp].section);
 629
 630                 /*
 631                  *      FIXME: This is probably an error.
 632                  */
 633                 if (!subcs) continue;
 634
 635                 for (ci = cf_item_find_next(subcs, NULL);
 636                      ci != NULL;
 637                      ci = cf_item_find_next(subcs, ci)) {
 638                         if (cf_item_is_section(ci)) {
 639                                 const char *name1;
 640                                 CONF_SECTION *type;
 641
 642                                 type = cf_itemtosection(ci);
 643                                 name1 = cf_section_name1(type);
 644
 645                                 /*
 646                                  *      Not Autz-Type, Auth-Type, etc.
 647                                  */
 648                                 if (strcmp(name1, section_type_value[comp].typename) != 0) {
 649                                         continue;
 650                                 }
 651
 652                                 name2 = cf_section_name2(cf_itemtosection(ci));
 653
 654                                 /*
 655                                  *      FIXME: This is probably an error.
 656                                  */
 657                                 if (!name2) continue;
 658
 659                         } else if (section_type_value[comp].attr != PW_AUTH_TYPE) {
 660                                 /*
 661                                  *      Create types for names only when
 662                                  *      parsing the authenticate section.
 663                                  */
 664                                 continue;
 665
 666                         } else {
 667                                 name2 = cf_pair_attr(cf_itemtopair(ci));
 668                         }
 669
 670                         /*
 671                          *      If the value already exists, don't
 672                          *      create it again.
 673                          */
 674                         dval = dict_valbyname(section_type_value[comp].attr,
 675                                               name2);
 676                         if (dval) continue;
 677
 678                         /*
 679                          *      Find the attribute for the value.
 680                          */
 681                         dattr = dict_attrbyvalue(section_type_value[comp].attr);
 682                         if (!dattr) {
 683                                 radlog(L_ERR, "%s[%d]: No such attribute %s",
 684                                        mainconfig.radiusd_conf,
 685                                        cf_section_lineno(subcs),
 686                                        section_type_value[comp].typename);
 687                                 continue;
 688                         }
 689
 690                         /*
 691                          *      Create a new unique value with a
 692                          *      meaningless number.  You can't look at
 693                          *      it from outside of this code, so it
 694                          *      doesn't matter.  The only requirement
 695                          *      is that it's unique.
 696                          */
 697                         do {
 698                                 value = lrad_rand() & 0x00ffffff;
 699                         } while (dict_valbyattr(dattr->attr, value));
 700
 701                         if (dict_addvalue(name2, dattr->name, value) < 0) {
 702                                 radlog(L_ERR, "%s", librad_errstr);
 703                                 return -1;
 704                         }
 705                 }
 706         } /* over the sections which can have redundent sub-sections */
 707
 708         DEBUG2(" modules {");
 709
 710         /*
 711          *      Loop over all of the known components, finding their
 712          *      configuration section, and loading it.
 713          */
 714         for (comp = 0; comp < RLM_COMPONENT_COUNT; ++comp) {
 715                 CONF_SECTION *subcs;
 716
 717                 if (!do_component[comp]) continue;
 718
 719                 subcs = cf_section_sub_find(cs,
 720                                             section_type_value[comp].section);
 721                 if (!subcs) continue;
 722
 723                 if (cf_item_find_next(subcs, NULL) == NULL) continue;
 724
 725                 DEBUG2(" Module: Checking %s {...} for more modules to load",
 726                        section_type_value[comp].section);
 727
 728                 if (load_component_section(NULL, subcs, space, comp,
 729                                            mainconfig.radiusd_conf) < 0) {
 730                         DEBUG2(" }");
 731                         return -1;
 732                 }
 733         } /* loop over components */
 734
 735         DEBUG2(" }");
 736
 737         return 0;
 738 }
 739
 740 /*
 741  *      Parse the module config sections, and load
 742  *      and call each module's init() function.
 743  *
 744  *      Libtool makes your life a LOT easier, especially with libltdl.
 745  *      see: http://www.gnu.org/software/libtool/
 746  */
 747 int setup_modules(int reload)
 748 {
 749         int             comp;
 750         CONF_SECTION    *cs, *modules;
 751         int             do_component[RLM_COMPONENT_COUNT];
 752         rad_listen_t    *listener;
 753
 754         /*
 755          *      If necessary, initialize libltdl.
 756          */
 757         if (!reload) {
 758                 /*
 759                  *      Set the default list of preloaded symbols.
 760                  *      This is used to initialize libltdl's list of
 761                  *      preloaded modules.
 762                  *
 763                  *      i.e. Static modules.
 764                  */
 765                 LTDL_SET_PRELOADED_SYMBOLS();
 766
 767                 if (lt_dlinit() != 0) {
 768                         radlog(L_ERR|L_CONS, "Failed to initialize libraries: %s\n",
 769                                         lt_dlerror());
 770                         return -1;
 771                 }
 772
 773                 /*
 774                  *      Set the search path to ONLY our library directory.
 775                  *      This prevents the modules from being found from
 776                  *      any location on the disk.
 777                  */
 778                 lt_dlsetsearchpath(radlib_dir);
 779
 780                 DEBUG2("radiusd: Library search path is %s",
 781                        lt_dlgetsearchpath());
 782
 783                 /*
 784                  *      Set up the internal module struct.
 785                  */
 786                 module_tree = rbtree_create(module_entry_cmp,
 787                                             module_entry_free, 0);
 788                 if (!module_tree) {
 789                         radlog(L_ERR|L_CONS, "Failed to initialize modules\n");
 790                         return -1;
 791                 }
 792         } else {
 793                 rbtree_free(components);
 794         }
 795
 796         components = rbtree_create(indexed_modcallable_cmp,
 797                                    indexed_modcallable_free, 0);
 798         if (!components) {
 799                 radlog(L_ERR|L_CONS, "Failed to initialize components\n");
 800                 return -1;
 801         }
 802
 803         /*
 804          *      Figure out which sections to load.
 805          */
 806         memset(do_component, 0, sizeof(do_component));
 807         for (listener = mainconfig.listen;
 808              listener != NULL;
 809              listener = listener->next) {
 810                 switch (listener->type) {
 811                 case RAD_LISTEN_AUTH:
 812                         do_component[RLM_COMPONENT_AUTZ] = 1;
 813                         do_component[RLM_COMPONENT_AUTH] = 1;
 814                         do_component[RLM_COMPONENT_POST_AUTH] = 1;
 815                         do_component[RLM_COMPONENT_SESS] = 1;
 816                         break;
 817
 818                 case RAD_LISTEN_DETAIL: /* just like acct */
 819                 case RAD_LISTEN_ACCT:
 820                         do_component[RLM_COMPONENT_PREACCT] = 1;
 821                         do_component[RLM_COMPONENT_ACCT] = 1;
 822                         break;
 823
 824                 case RAD_LISTEN_PROXY:
 825                         do_component[RLM_COMPONENT_PRE_PROXY] = 1;
 826                         do_component[RLM_COMPONENT_POST_PROXY] = 1;
 827                         break;
 828
 829                 case RAD_LISTEN_VQP:
 830                         do_component[RLM_COMPONENT_POST_AUTH] = 1;
 831                         break;
 832                         /*
 833                          *      Ignore this.
 834                          */
 835                 case RAD_LISTEN_SNMP:
 836                         break;
 837
 838                 default:
 839                         rad_assert(0 == 1);
 840                         break;
 841                 }
 842         }
 843
 844         for (comp = RLM_COMPONENT_AUTH; comp < RLM_COMPONENT_COUNT; comp++) {
 845                 /*
 846                  *      Have the debugging messages all in one place.
 847                  */
 848                 if (!do_component[comp]) {
 849                         DEBUG2("modules: Not loading %s{} section",
 850                                section_type_value[comp].section);
 851                 }
 852         }
 853
 854         /*
 855          *      Remember where the modules were stored.
 856          */
 857         modules = cf_section_find("modules");
 858         if (!modules) {
 859                 radlog(L_ERR, "Cannot find a \"modules\" section in the configuration file!");
 860                 return -1;
 861         }
 862
 863         /*
 864          *  Look for the 'instantiate' section, which tells us
 865          *  the instantiation order of the modules, and also allows
 866          *  us to load modules with no authorize/authenticate/etc.
 867          *  sections.
 868          */
 869         cs = cf_section_find("instantiate");
 870         if (cs != NULL) {
 871                 CONF_ITEM *ci;
 872                 CONF_PAIR *cp;
 873                 module_instance_t *module;
 874                 const char *name;
 875
 876                 DEBUG2(" instantiate {");
 877
 878                 /*
 879                  *  Loop over the items in the 'instantiate' section.
 880                  */
 881                 for (ci=cf_item_find_next(cs, NULL);
 882                      ci != NULL;
 883                      ci=cf_item_find_next(cs, ci)) {
 884
 885                         /*
 886                          *      Skip sections.  They'll be handled
 887                          *      later, if they're referenced at all...
 888                          */
 889                         if (cf_item_is_section(ci)) {
 890                                 continue;
 891                         }
 892
 893                         cp = cf_itemtopair(ci);
 894                         name = cf_pair_attr(cp);
 895                         module = find_module_instance(modules, name);
 896                         if (!module) {
 897                                 return -1;
 898                         }
 899                 } /* loop over items in the subsection */
 900
 901                 DEBUG2(" }");
 902         } /* if there's an 'instantiate' section. */
 903
 904         if (load_byspace(mainconfig.config, NULL, do_component) < 0) {
 905                 return -1;
 906         }
 907
 908         /*
 909          *      Load by identities, and by vmps.
 910          */
 911         for (listener = mainconfig.listen;
 912              listener != NULL;
 913              listener = listener->next) {
 914                 if (listener->type == RAD_LISTEN_VQP) {
 915                         cs = cf_section_find("vmps");
 916                         if (!cs) {
 917                                 radlog(L_ERR, "Listening on vmps socket, but no vmps section");
 918                                 return -1;
 919                         }
 920
 921                         if (cf_item_find_next(cs, NULL) == NULL) {
 922                                 radlog(L_ERR, "Listening on vmps socket, vmps section is empty");
 923                                 return -1;
 924                         }
 925
 926                         DEBUG2(" Module: Checking vmps {...} for more modules to load");
 927
 928                         if (load_component_section(NULL, cs, VMPS_SPACE,
 929                                                    RLM_COMPONENT_POST_AUTH,
 930                                                    mainconfig.radiusd_conf) < 0) {
 931                                 return -1;
 932                         }
 933
 934                         continue;
 935                 }
 936
 937                 if (!listener->identity) continue;
 938
 939                 /*
 940                  *      Load by identity
 941                  */
 942                 cs = cf_section_sub_find_name2(mainconfig.config,
 943                                                "identity", listener->identity);
 944                 if (!cs) continue;
 945
 946                 DEBUG2("identity %s {", listener->identity);
 947                 if (load_byspace(cs, listener->identity, do_component) < 0) {
 948                         DEBUG2("}");
 949                         return -1;
 950                 }
 951                 DEBUG2("}");
 952         }
 953
 954         return 0;
 955 }
 956
 957 /*
 958  *      Call all authorization modules until one returns
 959  *      somethings else than RLM_MODULE_OK
 960  */
 961 int module_authorize(int autz_type, REQUEST *request)
 962 {
 963         return indexed_modcall(request->listener->identity,
 964                                RLM_COMPONENT_AUTZ, autz_type, request);
 965 }
 966
 967 /*
 968  *      Authenticate a user/password with various methods.
 969  */
 970 int module_authenticate(int auth_type, REQUEST *request)
 971 {
 972         return indexed_modcall(request->listener->identity,
 973                                RLM_COMPONENT_AUTH, auth_type, request);
 974 }
 975
 976 /*
 977  *      Do pre-accounting for ALL configured sessions
 978  */
 979 int module_preacct(REQUEST *request)
 980 {
 981         return indexed_modcall(request->listener->identity,
 982                                RLM_COMPONENT_PREACCT, 0, request);
 983 }
 984
 985 /*
 986  *      Do accounting for ALL configured sessions
 987  */
 988 int module_accounting(int acct_type, REQUEST *request)
 989 {
 990         return indexed_modcall(request->listener->identity,
 991                                RLM_COMPONENT_ACCT, acct_type, request);
 992 }
 993
 994 /*
 995  *      See if a user is already logged in.
 996  *
 997  *      Returns: 0 == OK, 1 == double logins, 2 == multilink attempt
 998  */
 999 int module_checksimul(int sess_type, REQUEST *request, int maxsimul)
1000 {
1001         int rcode;
1002
1003         if(!request->username)
1004                 return 0;
1005
1006         request->simul_count = 0;
1007         request->simul_max = maxsimul;
1008         request->simul_mpp = 1;
1009
1010         rcode = indexed_modcall(request->listener->identity,
1011                                 RLM_COMPONENT_SESS, sess_type, request);
1012
1013         if (rcode != RLM_MODULE_OK) {
1014                 /* FIXME: Good spot for a *rate-limited* warning to the log */
1015                 return 0;
1016         }
1017
1018         return (request->simul_count < maxsimul) ? 0 : request->simul_mpp;
1019 }
1020
1021 /*
1022  *      Do pre-proxying for ALL configured sessions
1023  */
1024 int module_pre_proxy(int type, REQUEST *request)
1025 {
1026         return indexed_modcall(request->listener->identity,
1027                                RLM_COMPONENT_PRE_PROXY, type, request);
1028 }
1029
1030 /*
1031  *      Do post-proxying for ALL configured sessions
1032  */
1033 int module_post_proxy(int type, REQUEST *request)
1034 {
1035         return indexed_modcall(request->listener->identity,
1036                                RLM_COMPONENT_POST_PROXY, type, request);
1037 }
1038
1039 /*
1040  *      Do post-authentication for ALL configured sessions
1041  */
1042 int module_post_auth(int postauth_type, REQUEST *request)
1043 {
1044         return indexed_modcall(request->listener->identity,
1045                                RLM_COMPONENT_POST_AUTH, postauth_type, request);
1046 }
1047
1048 /*
1049  *      Do VMPS
1050  */
1051 int module_vmps(REQUEST *request)
1052 {
1053         return indexed_modcall(VMPS_SPACE, RLM_COMPONENT_POST_AUTH, 0,
1054                                request);
1055 }