src/modules/rlm_ldap/rlm_ldap.c

   1 /*
   2  * rlm_ldap.c LDAP authorization and authentication module.
   3  *
   4  *
   5  * This module is based on LDAP patch to Cistron radiusd by James Golovich
   6  * <james@wwnet.net>, which in turn was based mostly on a Mysql+Cistron patch
   7  * from <oyarzun@wilmington.net>
   8  *
   9  * 17 Jan 2000, Adrian Pavlykevych <pam@polynet.lviv.ua>
  10  *      - OpenLDAP SDK porting, basic TLS support, LDAP authorization,
  11  *        fault tolerance with multiple LDAP server support
  12  * 24 May 2000, Adrian Pavlykevych <pam@polynet.lviv.ua>
  13  *      - Converting to new configuration file format, futher improvements
  14  *        in fault tolerance, threaded operation
  15  * 12 Dec 2000, Adrian Pavlykevych <pam@polynet.lviv.ua>
  16  *      - Added preliminary support for multiple instances
  17  *      - moved all instance configuration into dynamicly allocated structure
  18  *      - Removed connection maintenance thread and all attempts for multihreading
  19  *        the module itself. OpenLDAP SDK is not thread safe when used with shared
  20  *        LDAP connection.
  21  *      - Added configuration option for defining LDAP attribute of user object,
  22  *        which controls remote access.
  23  * 16 Feb 2001, Hannu Laurila <hannu.laurila@japo.fi>
  24  *      - LDAP<->RADIUS attribute mappings are now read from a file
  25  *      - Support for generic RADIUS check and reply attribute.
  26  * Jun 2001, Kostas Kalevras <kkalev@noc.ntua.gr>
  27  *      - Fix: check and reply attributes from LDAP _replace_ existing ones
  28  *      - Added "default_profile" directive, which points to radiusProfile
  29  *        object, which contains default values for RADIUS users
  30  *      - Added "profile_attribute" directive, which specifies user object
  31  *        attribute pointing to radiusProfile object.
  32  * Nov 2001, Kostas Kalevras <kkalev@noc.ntua.gr>
  33  *      - Added support for adding the user password to the check. Based on
  34  *        the password_header directive rlm_ldap will strip the
  35  *        password header if needed. This will make support for CHAP much easier.
  36  *      - Added module messages when we reject a user.
  37  *      - Added ldap_groupcmp to allow searching for user group membership.
  38  *      - Added ldap_xlat to allow ldap urls in xlat strings. Something like:
  39  *        %{ldap:ldap:///dc=company,dc=com?cn?sub?uid=user}
  40  * Nov 2001, Gordon Tetlow <gordont@gnf.org>
  41  *      - Do an xlat on the access_group attribute.
  42  * Dec 2001, Kostas Kalevras <kkalev@noc.ntua.gr>
  43  *      - Added ldap caching for the default/regular profiles and group entries.
  44  *      - Fixed a memory leak in ldap_xlat.
  45  *      - Removed dict_attrbyname from ldap_pairget. They are not needed.
  46  *      - Moved the radius_xlat's for filter and basedn in ldap_authenticate() to
  47  *        the right place.
  48  *      - Made the module thread safe. We create a connection pool and each thread
  49  *        will call ldap_get_conn to lock one of the ldap connections and release with
  50  *        a call to ldap_release_conn when it has finished.
  51  *      - Request only the user attributes that interest us (radius attributes,regular
  52  *        profile,user password and access attribute).
  53  * Mar 2002, Kostas Kalevras <kkalev@noc.ntua.gr>
  54  *      - Fixed a bug where the ldap server will kill the idle connections from the ldap
  55  *        connection pool. We now check if ldap_search returns LDAP_SERVER_DOWN and try to
  56  *        reconnect if it does. Bug noted by Dan Perik <dan_perik-work@ntm.org.pg>
  57  * May 2002, Kostas Kalevras <kkalev@noc.ntua.gr>
  58  *      - Instead of the Group attribute we now have the Ldap-Group attribute, to avoid
  59  *        collisions with other modules
  60  *      - If perform_search fails check the ld != NULL before using it. Based on a bug report
  61  *        by John <jhogenmiller@pennswoods.net>
  62  * June 2002, Kostas Kalevras <kkalev@noc.ntua.gr>
  63  *      - Add the ability to do a paircmp on the check items. Add a compare_check_items boolean
  64  *        configuration directive which defaults to no. If it is set then we will do a compare
  65  *      - Add another configuration directive. access_attr_used_for_allow. If it is set to yes
  66  *        then the access_attr will be used to allow user access. If it is set to no then it will
  67  *        be used to deny user access.
  68  */
  69 static const char rcsid[] = "$Id$";
  70
  71 #include "autoconf.h"
  72
  73 #include        <sys/types.h>
  74 #include        <sys/socket.h>
  75 #include        <sys/time.h>
  76 #include        <netinet/in.h>
  77
  78 #include        <stdio.h>
  79 #include        <stdlib.h>
  80 #include        <netdb.h>
  81 #include        <pwd.h>
  82 #include        <time.h>
  83 #include        <ctype.h>
  84 #include        <string.h>
  85
  86 #include        <lber.h>
  87 #include        <ldap.h>
  88
  89 #include        <errno.h>
  90 #include        <unistd.h>
  91 #include        <pthread.h>
  92
  93 #include        "libradius.h"
  94 #include        "radiusd.h"
  95 #include        "conffile.h"
  96 #include        "modules.h"
  97 #include        "rad_assert.h"
  98
  99
 100 #define MAX_AUTH_QUERY_LEN      256
 101 #define TIMELIMIT 5
 102
 103 /* linked list of mappings between RADIUS attributes and LDAP attributes */
 104 struct TLDAP_RADIUS {
 105         char*                 attr;
 106         char*                 radius_attr;
 107         struct TLDAP_RADIUS*  next;
 108 };
 109 typedef struct TLDAP_RADIUS TLDAP_RADIUS;
 110
 111 typedef struct ldap_conn {
 112         LDAP            *ld;
 113         char            bound;
 114         pthread_mutex_t mutex;
 115 } LDAP_CONN;
 116
 117 #define MAX_SERVER_LINE 1024
 118
 119 typedef struct {
 120         char           *server;
 121         int             port;
 122         int             timelimit;
 123         struct timeval  net_timeout;
 124         struct timeval  timeout;
 125         int             debug;
 126         int             tls_mode;
 127         int             start_tls;
 128         int             num_conns;
 129         int             cache_timeout;
 130         int             cache_size;
 131         int             do_comp;
 132         int             default_allow;
 133         char           *login;
 134         char           *password;
 135         char           *filter;
 136         char           *basedn;
 137         char           *default_profile;
 138         char           *profile_attr;
 139         char           *access_group;
 140         char           *access_attr;
 141         char           *passwd_hdr;
 142         char           *passwd_attr;
 143         char           *dictionary_mapping;
 144         char           *groupname_attr;
 145         char           *groupmemb_filt;
 146         char            **atts;
 147         TLDAP_RADIUS   *check_item_map;
 148         TLDAP_RADIUS   *reply_item_map;
 149         LDAP_CONN       *conns;
 150         int             ldap_debug; /* Debug flag for LDAP SDK */
 151         char            *xlat_name; /* name used to xlat */
 152 }               ldap_instance;
 153
 154 static CONF_PARSER module_config[] = {
 155         {"server", PW_TYPE_STRING_PTR, offsetof(ldap_instance,server), NULL, NULL},
 156         {"port", PW_TYPE_INTEGER, offsetof(ldap_instance,port), NULL, "389"},
 157         /* wait forever on network activity */
 158         {"net_timeout", PW_TYPE_INTEGER, offsetof(ldap_instance,net_timeout.tv_sec), NULL, "10"},
 159         /* wait forever for search results */
 160         {"timeout", PW_TYPE_INTEGER, offsetof(ldap_instance,timeout.tv_sec), NULL, "20"},
 161         /* allow server unlimited time for search (server-side limit) */
 162         {"timelimit", PW_TYPE_INTEGER, offsetof(ldap_instance,timelimit), NULL, "20"},
 163         {"ldap_cache_timeout", PW_TYPE_INTEGER, offsetof(ldap_instance,cache_timeout), NULL, "0"},
 164         {"ldap_cache_size", PW_TYPE_INTEGER, offsetof(ldap_instance,cache_size), NULL, "0"},
 165         {"identity", PW_TYPE_STRING_PTR, offsetof(ldap_instance,login), NULL, ""},
 166         {"start_tls", PW_TYPE_BOOLEAN, offsetof(ldap_instance,start_tls), NULL, "no"},
 167         {"password", PW_TYPE_STRING_PTR, offsetof(ldap_instance,password), NULL, ""},
 168         {"basedn", PW_TYPE_STRING_PTR, offsetof(ldap_instance,basedn), NULL, NULL},
 169         {"filter", PW_TYPE_STRING_PTR, offsetof(ldap_instance,filter), NULL, "(uid=%u)"},
 170         {"default_profile", PW_TYPE_STRING_PTR, offsetof(ldap_instance,default_profile), NULL, NULL},
 171         {"profile_attribute", PW_TYPE_STRING_PTR, offsetof(ldap_instance,profile_attr), NULL, NULL},
 172         {"access_group", PW_TYPE_STRING_PTR, offsetof(ldap_instance,access_group), NULL, NULL},
 173         {"password_header", PW_TYPE_STRING_PTR, offsetof(ldap_instance,passwd_hdr), NULL, NULL},
 174         {"password_attribute", PW_TYPE_STRING_PTR, offsetof(ldap_instance,passwd_attr), NULL, NULL},
 175         /* LDAP attribute name that controls remote access */
 176         {"access_attr", PW_TYPE_STRING_PTR, offsetof(ldap_instance,access_attr), NULL, NULL},
 177         /* file with mapping between LDAP and RADIUS attributes */
 178         {"groupname_attribute", PW_TYPE_STRING_PTR, offsetof(ldap_instance,groupname_attr), NULL, "cn"},
 179         {"groupmembership_filter", PW_TYPE_STRING_PTR, offsetof(ldap_instance,groupmemb_filt), NULL, "(|(&(objectClass=GroupOfNames)(member=%{Ldap-UserDn}))(&(objectClass=GroupOfUniqueNames)(uniquemember=%{Ldap-UserDn})))"},
 180         {"dictionary_mapping", PW_TYPE_STRING_PTR, offsetof(ldap_instance,dictionary_mapping), NULL, "${confdir}/ldap.attrmap"},
 181         {"ldap_debug", PW_TYPE_INTEGER, offsetof(ldap_instance,ldap_debug), NULL, "0x0000"},
 182         {"ldap_connections_number", PW_TYPE_INTEGER, offsetof(ldap_instance,num_conns), NULL, "5"},
 183         {"compare_check_items", PW_TYPE_BOOLEAN, offsetof(ldap_instance,do_comp), NULL, "no"},
 184         {"access_attr_used_for_allow", PW_TYPE_BOOLEAN, offsetof(ldap_instance,default_allow), NULL, "yes"},
 185
 186         {NULL, -1, 0, NULL, NULL}
 187 };
 188
 189 #define ld_valid                ld_options.ldo_valid
 190 #define LDAP_VALID_SESSION      0x2
 191 #define LDAP_VALID(ld)  ( (ld)->ld_valid == LDAP_VALID_SESSION )
 192
 193 #ifdef FIELDCPY
 194 static void     fieldcpy(char *, char **);
 195 #endif
 196 static VALUE_PAIR *ldap_pairget(LDAP *, LDAPMessage *, TLDAP_RADIUS *,VALUE_PAIR **);
 197 static int ldap_groupcmp(void *, REQUEST *, VALUE_PAIR *, VALUE_PAIR *, VALUE_PAIR *, VALUE_PAIR **);
 198 static int ldap_xlat(void *,REQUEST *, char *, char *,int, RADIUS_ESCAPE_STRING);
 199 static LDAP    *ldap_connect(void *instance, const char *, const char *, int, int *);
 200 static int     read_mappings(ldap_instance* inst);
 201
 202 static inline int ldap_get_conn(LDAP_CONN *conns,LDAP_CONN **ret,void *instance)
 203 {
 204         ldap_instance *inst = instance;
 205         register int i = 0;
 206
 207         for(;i<inst->num_conns;i++){
 208                 if (pthread_mutex_trylock(&(conns[i].mutex)) == 0){
 209                         *ret = &conns[i];
 210                         DEBUG("ldap_get_conn: Got Id: %d",i);
 211                         return i;
 212                 }
 213         }
 214
 215         return -1;
 216 }
 217
 218 static inline void ldap_release_conn(int i, LDAP_CONN *conns)
 219 {
 220         DEBUG("ldap_release_conn: Release Id: %d",i);
 221         pthread_mutex_unlock(&(conns[i].mutex));
 222 }
 223
 224 /*************************************************************************
 225  *
 226  *      Function: rlm_ldap_instantiate
 227  *
 228  *      Purpose: Uses section of radiusd config file passed as parameter
 229  *               to create an instance of the module.
 230  *
 231  *************************************************************************/
 232 static int
 233 ldap_instantiate(CONF_SECTION * conf, void **instance)
 234 {
 235         ldap_instance  *inst;
 236         int i = 0;
 237         int atts_num = 0;
 238         int reply_map_num = 0;
 239         int check_map_num = 0;
 240         int att_map[3] = {0,0,0};
 241         TLDAP_RADIUS *pair;
 242         char *xlat_name;
 243
 244         inst = rad_malloc(sizeof *inst);
 245
 246         if (cf_section_parse(conf, inst, module_config) < 0) {
 247                 free(inst);
 248                 return -1;
 249         }
 250
 251         if (inst->server == NULL) {
 252                 radlog(L_ERR, "rlm_ldap: missing 'server' directive.");
 253                 free(inst);
 254                 return -1;
 255         }
 256
 257         inst->timeout.tv_usec = 0;
 258         inst->net_timeout.tv_usec = 0;
 259         inst->tls_mode = LDAP_OPT_X_TLS_TRY;
 260         inst->reply_item_map = NULL;
 261         inst->check_item_map = NULL;
 262         inst->conns = NULL;
 263
 264         paircompare_register(PW_LDAP_GROUP, PW_USER_NAME, ldap_groupcmp, inst);
 265         DEBUG("conns: %p",inst->conns);
 266
 267         xlat_name = cf_section_name2(conf);
 268         if (xlat_name == NULL) {
 269                 xlat_name = cf_section_name1(conf);
 270                 rad_assert(xlat_name != NULL); /* or all hell breaks loose */
 271         }
 272         inst->xlat_name = strdup(xlat_name);
 273         xlat_register(xlat_name,ldap_xlat,inst);
 274
 275         if (inst->num_conns <= 0){
 276                 radlog(L_ERR, "rlm_ldap: Invalid ldap connections number passed.");
 277                 free(inst);
 278                 return -1;
 279         }
 280         inst->conns = (LDAP_CONN *)malloc(sizeof(LDAP_CONN)*inst->num_conns);
 281         if (inst->conns == NULL){
 282                 radlog(L_ERR, "rlm_ldap: Could not allocate memory. Aborting.");
 283                 free(inst);
 284                 return -1;
 285         }
 286         for(;i<inst->num_conns;i++){
 287                 inst->conns[i].bound = 0;
 288                 inst->conns[i].ld = NULL;
 289                 pthread_mutex_init(&inst->conns[i].mutex, NULL);
 290         }
 291
 292         if (read_mappings(inst) != 0) {
 293                 radlog(L_ERR, "rlm_ldap: Reading dictionary mappings from file %s failed",
 294                        inst->dictionary_mapping);
 295                 radlog(L_ERR, "rlm_ldap: Proceeding with no mappings");
 296         }
 297
 298         pair = inst->check_item_map;
 299         while(pair != NULL){
 300                 atts_num++;
 301                 pair = pair->next;
 302         }
 303         check_map_num = (atts_num - 1);
 304         pair = inst->reply_item_map;
 305         while(pair != NULL){
 306                 atts_num++;
 307                 pair = pair->next;
 308         }
 309         reply_map_num = (atts_num - 1);
 310         if (inst->profile_attr)
 311                 atts_num++;
 312         if (inst->passwd_attr)
 313                 atts_num++;
 314         if (inst->access_attr)
 315                 atts_num++;
 316         inst->atts = (char **)malloc(sizeof(char *)*(atts_num + 1));
 317         if (inst->atts == NULL){
 318                 radlog(L_ERR, "rlm_ldap: Could not allocate memory. Aborting.");
 319                 free(inst);
 320                 return -1;
 321         }
 322         pair = inst->check_item_map;
 323         for(i=0;i<atts_num;i++){
 324                 if (i <= check_map_num ){
 325                         inst->atts[i] = pair->attr;
 326                         if (i == check_map_num)
 327                                 pair = inst->reply_item_map;
 328                         else
 329                                 pair = pair->next;
 330                 }
 331                 else if (i <= reply_map_num){
 332                         inst->atts[i] = pair->attr;
 333                         pair = pair->next;
 334                 }
 335                 else{
 336                         if (inst->profile_attr && !att_map[0]){
 337                                 inst->atts[i] = inst->profile_attr;
 338                                 att_map[0] = 1;
 339                         }
 340                         else if (inst->passwd_attr && !att_map[1]){
 341                                 inst->atts[i] = inst->passwd_attr;
 342                                 att_map[1] = 1;
 343                         }
 344                         else if (inst->access_attr && !att_map[2]){
 345                                 inst->atts[i] = inst->access_attr;
 346                                 att_map[2] = 1;
 347                         }
 348                 }
 349         }
 350         inst->atts[atts_num] = NULL;
 351
 352         DEBUG("conns: %p",inst->conns);
 353
 354         *instance = inst;
 355
 356
 357         return 0;
 358 }
 359
 360
 361 /*
 362  * read_mappings(...) reads a ldap<->radius mappings file to inst->reply_item_map and inst->check_item_map
 363  */
 364
 365 #define MAX_LINE_LEN 160
 366 #define GENERIC_ATTRIBUTE_ID "$GENERIC$"
 367
 368 static int
 369 read_mappings(ldap_instance* inst)
 370 {
 371         FILE* mapfile;
 372         char *filename;
 373         /* all buffers are of MAX_LINE_LEN so we can use sscanf without being afraid of buffer overflows */
 374         char buf[MAX_LINE_LEN], itemType[MAX_LINE_LEN], radiusAttribute[MAX_LINE_LEN], ldapAttribute[MAX_LINE_LEN];
 375         int linenumber;
 376
 377         /* open the mappings file for reading */
 378
 379         filename = inst->dictionary_mapping;
 380         DEBUG("rlm_ldap: reading ldap<->radius mappings from file %s", filename);
 381         mapfile = fopen(filename, "r");
 382
 383         if (mapfile == NULL) {
 384                 radlog(L_ERR, "rlm_ldap: Opening file %s failed", filename);
 385                 return -1; /* error */
 386         }
 387
 388         /* read file line by line. Note that if line length exceed MAX_LINE_LEN, line numbers will be mixed up */
 389
 390         linenumber = 0;
 391
 392         while (fgets(buf, sizeof buf, mapfile)!=NULL) {
 393                 char* ptr;
 394                 int token_count;
 395                 TLDAP_RADIUS* pair;
 396
 397                 linenumber++;
 398
 399                 /* strip comments */
 400                 ptr = strchr(buf, '#');
 401                 if (ptr) *ptr = 0;
 402
 403                 /* empty line */
 404                 if (buf[0] == 0) continue;
 405
 406                 /* extract tokens from the string */
 407                 token_count = sscanf(buf, "%s %s %s", itemType, radiusAttribute, ldapAttribute);
 408
 409                 if (token_count <= 0) /* no tokens */
 410                         continue;
 411
 412                 if (token_count != 3) {
 413                         radlog(L_ERR, "rlm_ldap: Skipping %s line %i: %s", filename, linenumber, buf);
 414                         radlog(L_ERR, "rlm_ldap: Expected 3 tokens "
 415                                "(Item type, RADIUS Attribute and LDAP Attribute) but found only %i", token_count);
 416                         continue;
 417                 }
 418
 419                 /* create new TLDAP_RADIUS list node */
 420                 pair = rad_malloc(sizeof(TLDAP_RADIUS));
 421
 422                 pair->attr = strdup(ldapAttribute);
 423                 pair->radius_attr = strdup(radiusAttribute);
 424
 425                 if ( (pair->attr == NULL) || (pair->radius_attr == NULL) ) {
 426                         radlog(L_ERR, "rlm_ldap: Out of memory");
 427                         if (pair->attr) free(pair->attr);
 428                         if (pair->radius_attr) free(pair->radius_attr);
 429                         free(pair);
 430                         fclose(mapfile);
 431                         return -1;
 432                 }
 433
 434                 /* push node to correct list */
 435                 if (strcasecmp(itemType, "checkItem") == 0) {
 436                         pair->next = inst->check_item_map;
 437                         inst->check_item_map = pair;
 438                 } else if (strcasecmp(itemType, "replyItem") == 0) {
 439                         pair->next = inst->reply_item_map;
 440                         inst->reply_item_map = pair;
 441                 } else {
 442                         radlog(L_ERR, "rlm_ldap: file %s: skipping line %i: unknown itemType %s",
 443                                filename, linenumber, itemType);
 444                         free(pair->attr);
 445                         free(pair->radius_attr);
 446                         free(pair);
 447                         continue;
 448                 }
 449
 450                 DEBUG("rlm_ldap: LDAP %s mapped to RADIUS %s",
 451                       pair->attr, pair->radius_attr);
 452         }
 453
 454         fclose(mapfile);
 455
 456         return 0; /* success */
 457 }
 458
 459 static int
 460 perform_search(void *instance, LDAP_CONN *conn, char *search_basedn, int scope, char *filter,
 461                 char **attrs, LDAPMessage ** result)
 462 {
 463         int             res = RLM_MODULE_OK;
 464         int             ldap_errno = 0;
 465         ldap_instance  *inst = instance;
 466         int             search_retry = 0;
 467
 468         *result = NULL;
 469
 470         if (!conn){
 471                 radlog(L_ERR, "rlm_ldap: NULL connection handle passed");
 472                 return RLM_MODULE_FAIL;
 473         }
 474 retry:
 475         if (!conn->bound) {
 476                 DEBUG2("rlm_ldap: attempting LDAP reconnection");
 477                 if (conn->ld){
 478                         DEBUG2("rlm_ldap: closing existing LDAP connection");
 479                         if (inst->cache_timeout >0)
 480                                 ldap_destroy_cache(conn->ld);
 481                         ldap_unbind_s(conn->ld);
 482                 }
 483                 if ((conn->ld = ldap_connect(instance, inst->login, inst->password, 0, &res)) == NULL) {
 484                         radlog(L_ERR, "rlm_ldap: (re)connection attempt failed");
 485                         return (RLM_MODULE_FAIL);
 486                 }
 487                 conn->bound = 1;
 488         }
 489         DEBUG2("rlm_ldap: performing search in %s, with filter %s", search_basedn ? search_basedn : "(null)" , filter);
 490         switch (ldap_search_st(conn->ld, search_basedn, scope, filter, attrs, 0, &(inst->timeout), result)) {
 491         case LDAP_SUCCESS:
 492                 break;
 493         case LDAP_SERVER_DOWN:
 494                 if (search_retry == 0){
 495                         DEBUG("rlm_ldap: LDAP connection lost. Attempting reconnect");
 496                         search_retry = 1;
 497                         conn->bound = 0;
 498                         ldap_msgfree(*result);
 499                         goto retry;
 500                 }
 501         default:
 502                 ldap_get_option(conn->ld, LDAP_OPT_ERROR_NUMBER, &ldap_errno);
 503                 radlog(L_ERR, "rlm_ldap: ldap_search() failed: %s", ldap_err2string(ldap_errno));
 504                 conn->bound = 0;
 505                 ldap_msgfree(*result);
 506                 return (RLM_MODULE_FAIL);
 507         }
 508
 509         if ((ldap_count_entries(conn->ld, *result)) != 1) {
 510                 DEBUG("rlm_ldap: object not found or got ambiguous search result");
 511                 res = RLM_MODULE_NOTFOUND;
 512                 ldap_msgfree(*result);
 513         }
 514         return res;
 515 }
 516
 517
 518 /*
 519  * ldap_groupcmp(). Implement the Ldap-Group == "group" filter
 520  */
 521
 522 static int ldap_groupcmp(void *instance, REQUEST *req, VALUE_PAIR *request, VALUE_PAIR *check,
 523                 VALUE_PAIR *check_pairs, VALUE_PAIR **reply_pairs)
 524 {
 525         char            filter[MAX_AUTH_QUERY_LEN];
 526         char            *group_dn;
 527         int             res;
 528         LDAPMessage     *result = NULL;
 529         LDAPMessage     *msg = NULL;
 530         char            basedn[1024];
 531         char            *attrs[] = {"dn",NULL};
 532         ldap_instance   *inst = instance;
 533         LDAP_CONN       *conn;
 534         int             conn_id = -1;
 535
 536         check_pairs = check_pairs;
 537         reply_pairs = reply_pairs;
 538
 539         DEBUG("rlm_ldap: Entering ldap_groupcmp()");
 540
 541         if (check->strvalue == NULL || check->length == 0){
 542                 DEBUG("rlm_ldap::ldap_groupcmp: Illegal group name");
 543                 return 1;
 544         }
 545
 546         if (req == NULL){
 547                 DEBUG("rlm_ldap::ldap_groupcmp: NULL request");
 548                 return 1;
 549         }
 550
 551         if (!radius_xlat(basedn, sizeof(basedn), inst->basedn, req, NULL)) {
 552                 DEBUG("rlm_ldap::ldap_groupcmp: unable to create basedn.");
 553                 return 1;
 554         }
 555
 556         if ((pairfind(req->packet->vps, LDAP_USERDN)) == NULL){
 557                 char            *user_dn = NULL;
 558
 559                 if (!radius_xlat(filter, MAX_AUTH_QUERY_LEN, inst->filter, req, NULL)) {
 560                         DEBUG("rlm_ldap::ldap_groupcmp: unable to create filter");
 561                         return 1;
 562                 }
 563                 if ((conn_id = ldap_get_conn(inst->conns,&conn,inst)) == -1){
 564                         radlog(L_ERR, "rlm_ldap: All ldap connections are in use");
 565                         return 1;
 566                 }
 567                 if ((res = perform_search(inst, conn, basedn, LDAP_SCOPE_SUBTREE, filter, attrs, &result)) != RLM_MODULE_OK) {
 568                         DEBUG("rlm_ldap::ldap_groupcmp: search failed");
 569                         ldap_release_conn(conn_id,inst->conns);
 570                         return 1;
 571                 }
 572                 if ((msg = ldap_first_entry(conn->ld, result)) == NULL) {
 573                         DEBUG("rlm_ldap::ldap_groupcmp: ldap_first_entry() failed");
 574                         ldap_release_conn(conn_id,inst->conns);
 575                         ldap_msgfree(result);
 576                         return 1;
 577                 }
 578                 if ((user_dn = ldap_get_dn(conn->ld, msg)) == NULL) {
 579                         DEBUG("rlm_ldap:ldap_groupcmp:: ldap_get_dn() failed");
 580                         ldap_release_conn(conn_id,inst->conns);
 581                         ldap_msgfree(result);
 582                         return 1;
 583                 }
 584                 /*
 585                 * Adding new attribute containing DN for LDAP object associated with
 586                 * given username
 587                 */
 588                 pairadd(&req->packet->vps, pairmake("Ldap-UserDn", user_dn, T_OP_EQ));
 589                 ldap_memfree(user_dn);
 590                 ldap_msgfree(result);
 591         }
 592
 593         snprintf(filter,MAX_AUTH_QUERY_LEN - 1, "(%s=%s)",inst->groupname_attr,(char *)check->strvalue);
 594
 595         if (conn_id == -1 && (conn_id = ldap_get_conn(inst->conns,&conn,inst)) == -1){
 596                 radlog(L_ERR, "rlm_ldap: All ldap connections are in use");
 597                 return 1;
 598         }
 599
 600         if (inst->cache_timeout >0 && conn->ld != NULL)
 601                 ldap_enable_cache(conn->ld, inst->cache_timeout, inst->cache_size);
 602
 603         if ((res = perform_search(inst, conn, basedn, LDAP_SCOPE_SUBTREE, filter, attrs, &result)) != RLM_MODULE_OK){
 604                 if (inst->cache_timeout >0 && conn->ld != NULL)
 605                         ldap_disable_cache(conn->ld);
 606                 if (res == RLM_MODULE_NOTFOUND){
 607                         DEBUG("rlm_ldap::ldap_groupcmp: Group %s not found", (char *)check->strvalue);
 608                         ldap_release_conn(conn_id,inst->conns);
 609                         return 1;
 610                 }
 611                 DEBUG("rlm_ldap::ldap_groupcmp: Search returned error");
 612                 ldap_release_conn(conn_id,inst->conns);
 613                 return 1;
 614         }
 615         if ((msg = ldap_first_entry(conn->ld, result)) == NULL){
 616                 DEBUG("rlm_ldap::ldap_groupcmp: ldap_first_entry() failed");
 617                 if (inst->cache_timeout >0)
 618                         ldap_disable_cache(conn->ld);
 619                 ldap_release_conn(conn_id,inst->conns);
 620                 ldap_msgfree(result);
 621                 return 1;
 622         }
 623         if ((group_dn = ldap_get_dn(conn->ld, msg)) == NULL){
 624                 DEBUG("rlm_ldap:ldap_groupcmp:: ldap_get_dn() failed");
 625                 if (inst->cache_timeout >0)
 626                         ldap_disable_cache(conn->ld);
 627                 ldap_release_conn(conn_id,inst->conns);
 628                 ldap_msgfree(result);
 629                 return 1;
 630         }
 631         ldap_msgfree(result);
 632
 633
 634         if(!radius_xlat(filter, MAX_AUTH_QUERY_LEN, inst->groupmemb_filt, req, NULL)){
 635                 DEBUG("rlm_ldap::ldap_groupcmp: unable to create filter.");
 636                 if (inst->cache_timeout >0)
 637                         ldap_disable_cache(conn->ld);
 638                 ldap_release_conn(conn_id,inst->conns);
 639                 ldap_memfree(group_dn);
 640                 return 1;
 641         }
 642
 643         if ((res = perform_search(inst, conn, group_dn, LDAP_SCOPE_BASE, filter, attrs, &result)) != RLM_MODULE_OK){
 644                 if (inst->cache_timeout >0 && conn->ld != NULL)
 645                         ldap_disable_cache(conn->ld);
 646                 ldap_release_conn(conn_id,inst->conns);
 647                 if (res == RLM_MODULE_NOTFOUND){
 648                         DEBUG("rlm_ldap::ldap_groupcmp: User not found in group %s",group_dn);
 649                         ldap_memfree(group_dn);
 650                         return -1;
 651                 }
 652                 DEBUG("rlm_ldap::ldap_groupcmp: Search returned error");
 653                 ldap_memfree(group_dn);
 654                 return 1;
 655         }
 656         else{
 657                 DEBUG("rlm_ldap::ldap_groupcmp: User found in group %s",group_dn);
 658                 if (inst->cache_timeout >0)
 659                         ldap_disable_cache(conn->ld);
 660                 ldap_memfree(group_dn);
 661                 ldap_msgfree(result);
 662         }
 663         ldap_release_conn(conn_id,inst->conns);
 664
 665         return 0;
 666
 667 }
 668
 669 /*
 670  * ldap_xlat()
 671  * Do an xlat on an LDAP URL
 672  */
 673
 674 static int ldap_xlat(void *instance, REQUEST *request, char *fmt, char *out, int freespace,
 675                                 RADIUS_ESCAPE_STRING func)
 676 {
 677         char url[MAX_STRING_LEN];
 678         int res;
 679         int ret = 0;
 680         ldap_instance *inst = instance;
 681         LDAPURLDesc *ldap_url;
 682         LDAPMessage *result = NULL;
 683         LDAPMessage *msg = NULL;
 684         char **vals;
 685         int conn_id = -1;
 686         LDAP_CONN *conn;
 687
 688         DEBUG("rlm_ldap: - ldap_xlat");
 689         if (!radius_xlat(url, sizeof(url), fmt, request, func)) {
 690                 radlog (L_ERR, "rlm_ldap: Unable to create LDAP URL.\n");
 691                 return 0;
 692         }
 693         if (!ldap_is_ldap_url(url)){
 694                 radlog (L_ERR, "rlm_ldap: String passed does not look like an LDAP URL.\n");
 695                 return 0;
 696         }
 697         if (ldap_url_parse(url,&ldap_url)){
 698                 radlog (L_ERR, "rlm_ldap: LDAP URL parse failed.\n");
 699                 return 0;
 700         }
 701         if (ldap_url->lud_attrs == NULL || ldap_url->lud_attrs[0] == NULL || \
 702                 ( ldap_url->lud_attrs[1] != NULL || ( ! strlen(ldap_url->lud_attrs[0]) || \
 703                 ! strcmp(ldap_url->lud_attrs[0],"*") ) ) ){
 704                 radlog (L_ERR, "rlm_ldap: Invalid Attribute(s) request.\n");
 705                 ldap_free_urldesc(ldap_url);
 706                 return 0;
 707         }
 708         if (ldap_url->lud_host){
 709                 if (strncmp(inst->server,ldap_url->lud_host,strlen(inst->server)) != 0 || \
 710                                 ldap_url->lud_port != inst->port){
 711                         DEBUG("rlm_ldap: Requested server/port is not known to this module instance.");
 712                         ldap_free_urldesc(ldap_url);
 713                         return 0;
 714                 }
 715         }
 716         if ((conn_id = ldap_get_conn(inst->conns,&conn,inst)) == -1){
 717                 radlog(L_ERR, "rlm_ldap: All ldap connections are in use");
 718                 return 1;
 719         }
 720         if ((res = perform_search(inst, conn, ldap_url->lud_dn, ldap_url->lud_scope, ldap_url->lud_filter, ldap_url->lud_attrs, &result)) != RLM_MODULE_OK){
 721                 if (res == RLM_MODULE_NOTFOUND){
 722                         DEBUG("rlm_ldap: Search returned not found");
 723                         ldap_free_urldesc(ldap_url);
 724                         ldap_release_conn(conn_id,inst->conns);
 725                         return 0;
 726                 }
 727                 DEBUG("rlm_ldap: Search returned error");
 728                 ldap_free_urldesc(ldap_url);
 729                 ldap_release_conn(conn_id,inst->conns);
 730                 return 0;
 731         }
 732         if ((msg = ldap_first_entry(conn->ld, result)) == NULL){
 733                 DEBUG("rlm_ldap: ldap_first_entry() failed");
 734                 ldap_msgfree(result);
 735                 ldap_free_urldesc(ldap_url);
 736                 ldap_release_conn(conn_id,inst->conns);
 737                 return 0;
 738         }
 739         if ((vals = ldap_get_values(conn->ld, msg, ldap_url->lud_attrs[0])) != NULL) {
 740                 ret = strlen(vals[0]);
 741                 if (ret > freespace){
 742                         DEBUG("rlm_ldap: Insufficient string space");
 743                         ldap_free_urldesc(ldap_url);
 744                         ldap_value_free(vals);
 745                         ldap_msgfree(result);
 746                         ldap_release_conn(conn_id,inst->conns);
 747                         return 0;
 748                 }
 749                 DEBUG("rlm_ldap: Adding attribute %s, value: %s",ldap_url->lud_attrs[0],vals[0]);
 750                 strncpy(out,vals[0],ret);
 751                 ldap_value_free(vals);
 752         }
 753         else
 754                 ret = 0;
 755
 756         ldap_msgfree(result);
 757         ldap_free_urldesc(ldap_url);
 758         ldap_release_conn(conn_id,inst->conns);
 759
 760         DEBUG("rlm_ldap: - ldap_xlat end");
 761
 762         return ret;
 763 }
 764
 765
 766 /******************************************************************************
 767  *
 768  *      Function: rlm_ldap_authorize
 769  *
 770  *      Purpose: Check if user is authorized for remote access
 771  *
 772  ******************************************************************************/
 773 static int
 774 ldap_authorize(void *instance, REQUEST * request)
 775 {
 776         LDAPMessage     *result = NULL;
 777         LDAPMessage     *msg = NULL;
 778         LDAPMessage     *def_msg = NULL;
 779         LDAPMessage     *def_attr_msg = NULL;
 780         LDAPMessage     *gr_result = NULL;
 781         LDAPMessage     *def_result = NULL;
 782         LDAPMessage     *def_attr_result = NULL;
 783         ldap_instance   *inst = instance;
 784         char            *user_dn = NULL;
 785         char            filter[MAX_AUTH_QUERY_LEN];
 786         char            basedn[1024];
 787         VALUE_PAIR      *check_tmp;
 788         VALUE_PAIR      *reply_tmp;
 789         int             res;
 790         VALUE_PAIR      **check_pairs, **reply_pairs;
 791         char            **vals;
 792         VALUE_PAIR      *module_fmsg_vp;
 793         VALUE_PAIR      *user_profile;
 794         char            module_fmsg[MAX_STRING_LEN];
 795         LDAP_CONN       *conn;
 796         int             conn_id = -1;
 797
 798         DEBUG("rlm_ldap: - authorize");
 799
 800         if (!request->username){
 801                 radlog(L_AUTH, "rlm_ldap: Attribute \"User-Name\" is required for authentication.\n");
 802                 return RLM_MODULE_INVALID;
 803         }
 804
 805         check_pairs = &request->config_items;
 806         reply_pairs = &request->reply->vps;
 807
 808         /*
 809          * Check for valid input, zero length names not permitted
 810          */
 811         if (request->username->strvalue == 0) {
 812                 radlog(L_ERR, "rlm_ldap: zero length username not permitted\n");
 813                 return RLM_MODULE_INVALID;
 814         }
 815         DEBUG("rlm_ldap: performing user authorization for %s",
 816                request->username->strvalue);
 817
 818         if (!radius_xlat(filter, sizeof(filter), inst->filter,
 819                          request, NULL)) {
 820                 radlog (L_ERR, "rlm_ldap: unable to create filter.\n");
 821                 return RLM_MODULE_INVALID;
 822         }
 823
 824         if (!radius_xlat(basedn, sizeof(basedn), inst->basedn,
 825                          request, NULL)) {
 826                 radlog (L_ERR, "rlm_ldap: unable to create basedn.\n");
 827                 return RLM_MODULE_INVALID;
 828         }
 829
 830         if ((conn_id = ldap_get_conn(inst->conns,&conn,inst)) == -1){
 831                 radlog(L_ERR, "rlm_ldap: All ldap connections are in use");
 832                 return RLM_MODULE_FAIL;
 833         }
 834         if ((res = perform_search(instance, conn, basedn, LDAP_SCOPE_SUBTREE, filter, inst->atts, &result)) != RLM_MODULE_OK) {
 835                 DEBUG("rlm_ldap: search failed");
 836                 if (res == RLM_MODULE_NOTFOUND){
 837                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_ldap: User not found");
 838                         module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
 839                         pairadd(&request->packet->vps, module_fmsg_vp);
 840                 }
 841                 ldap_release_conn(conn_id,inst->conns);
 842                 return (res);
 843         }
 844         if ((msg = ldap_first_entry(conn->ld, result)) == NULL) {
 845                 DEBUG("rlm_ldap: ldap_first_entry() failed");
 846                 ldap_msgfree(result);
 847                 ldap_release_conn(conn_id,inst->conns);
 848                 return RLM_MODULE_FAIL;
 849         }
 850         if ((user_dn = ldap_get_dn(conn->ld, msg)) == NULL) {
 851                 DEBUG("rlm_ldap: ldap_get_dn() failed");
 852                 ldap_msgfree(result);
 853                 ldap_release_conn(conn_id,inst->conns);
 854                 return RLM_MODULE_FAIL;
 855         }
 856         /*
 857          * Adding new attribute containing DN for LDAP object associated with
 858          * given username
 859          */
 860         pairadd(&request->packet->vps, pairmake("Ldap-UserDn", user_dn, T_OP_EQ));
 861         ldap_memfree(user_dn);
 862
 863
 864         /* Remote access is controled by attribute of the user object */
 865         if (inst->access_attr) {
 866                 if ((vals = ldap_get_values(conn->ld, msg, inst->access_attr)) != NULL) {
 867                         if (inst->default_allow){
 868                                 DEBUG("rlm_ldap: checking if remote access for %s is allowed by %s", request->username->strvalue, inst->access_attr);
 869                                 if (!strncmp(vals[0], "FALSE", 5)) {
 870                                         DEBUG("rlm_ldap: dialup access disabled");
 871                                         snprintf(module_fmsg,sizeof(module_fmsg),"rlm_ldap: Access Attribute denies access");
 872                                         module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
 873                                         pairadd(&request->packet->vps, module_fmsg_vp);
 874                                         ldap_msgfree(result);
 875                                         ldap_value_free(vals);
 876                                         ldap_release_conn(conn_id,inst->conns);
 877                                         return RLM_MODULE_USERLOCK;
 878                                 }
 879                                 ldap_value_free(vals);
 880                         }
 881                         else{
 882                                 DEBUG("rlm_ldap: %s attribute exists - access denied by default", inst->access_attr);
 883                                 snprintf(module_fmsg,sizeof(module_fmsg),"rlm_ldap: Access Attribute denies access");
 884                                 module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
 885                                 pairadd(&request->packet->vps, module_fmsg_vp);
 886                                 ldap_msgfree(result);
 887                                 ldap_value_free(vals);
 888                                 ldap_release_conn(conn_id,inst->conns);
 889                                 return RLM_MODULE_USERLOCK;
 890                         }
 891                 } else {
 892                         if (inst->default_allow){
 893                                 DEBUG("rlm_ldap: no %s attribute - access denied by default", inst->access_attr);
 894                                 snprintf(module_fmsg,sizeof(module_fmsg),"rlm_ldap: Access Attribute denies access");
 895                                 module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
 896                                 pairadd(&request->packet->vps, module_fmsg_vp);
 897                                 ldap_msgfree(result);
 898                                 ldap_release_conn(conn_id,inst->conns);
 899                                 return RLM_MODULE_USERLOCK;
 900                         }
 901                 }
 902         }
 903         if (inst->cache_timeout >0)
 904                 ldap_enable_cache(conn->ld, inst->cache_timeout, inst->cache_size);
 905
 906         /* Remote access controled by group membership of the user object */
 907         if (inst->access_group != NULL) {
 908                 static char     group[MAX_AUTH_QUERY_LEN];
 909                 static char     *attrs[] = {"dn", NULL};
 910
 911                 DEBUG("rlm_ldap: checking user membership in dialup-enabling group %s", inst->access_group);
 912                 /*
 913                  * uniquemember appears in Netscape Directory Server's groups
 914                  * since we have objectclass groupOfNames and
 915                  * groupOfUniqueNames
 916                  */
 917                 if(!radius_xlat(group, MAX_AUTH_QUERY_LEN, inst->access_group,
 918                                 request, NULL))
 919                         radlog (L_ERR, "rlm_ldap: unable to munge group.\n");
 920
 921                 if(!radius_xlat(filter, MAX_AUTH_QUERY_LEN, inst->groupmemb_filt,
 922                                 request, NULL))
 923                         radlog (L_ERR, "rlm_ldap: unable to create filter.\n");
 924
 925                 if ((res = perform_search(instance, conn, group, LDAP_SCOPE_BASE, filter, attrs, &gr_result)) != RLM_MODULE_OK) {
 926                         if (inst->cache_timeout >0 && conn->ld != NULL)
 927                                 ldap_disable_cache(conn->ld);
 928                         ldap_msgfree(result);
 929                         ldap_release_conn(conn_id,inst->conns);
 930                         if (res == RLM_MODULE_NOTFOUND){
 931                                 snprintf(module_fmsg,sizeof(module_fmsg),"rlm_ldap: User is not an access group member");
 932                                 module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
 933                                 pairadd(&request->packet->vps, module_fmsg_vp);
 934                                 return (RLM_MODULE_USERLOCK);
 935                         }
 936                         else
 937                                 return (res);
 938                 } else
 939                         ldap_msgfree(gr_result);
 940         }
 941
 942         /*
 943          * Check for the default profile entry. If it exists then add the
 944          * attributes it contains in the check and reply pairs
 945          */
 946
 947         user_profile = pairfind(request->config_items, PW_USER_PROFILE);
 948         if (inst->default_profile || user_profile){
 949                 char *profile = inst->default_profile;
 950
 951                 strncpy(filter,"(objectclass=radiusprofile)",MAX_AUTH_QUERY_LEN);
 952                 if (user_profile)
 953                         profile = user_profile->strvalue;
 954                 if (profile && strlen(profile)){
 955                         if ((res = perform_search(instance, conn,
 956                                 profile, LDAP_SCOPE_BASE,
 957                                 filter, inst->atts, &def_result)) == RLM_MODULE_OK){
 958                                 if ((def_msg = ldap_first_entry(conn->ld,def_result))){
 959                                         if ((check_tmp = ldap_pairget(conn->ld,def_msg,inst->check_item_map,check_pairs)))
 960                                                 pairadd(check_pairs,check_tmp);
 961                                         if ((reply_tmp = ldap_pairget(conn->ld,def_msg,inst->reply_item_map,reply_pairs)))
 962                                                 pairadd(reply_pairs,reply_tmp);
 963                                 }
 964                                 ldap_msgfree(def_result);
 965                         } else
 966                                 DEBUG("rlm_ldap: default_profile/user-profile search failed");
 967                 }
 968         }
 969
 970         /*
 971          * Check for the profile attribute. If it exists, we assume that it
 972          * contains the DN of an entry containg a profile for the user. That
 973          * way we can have different general profiles for various user groups
 974          * (students,faculty,staff etc)
 975          */
 976
 977         if (inst->profile_attr){
 978                 if ((vals = ldap_get_values(conn->ld, msg, inst->profile_attr)) != NULL && strlen(vals[0])) {
 979                         strncpy(filter,"(objectclass=radiusprofile)",MAX_AUTH_QUERY_LEN);
 980                         if ((res = perform_search(instance, conn,
 981                                 vals[0], LDAP_SCOPE_BASE,
 982                                 filter, inst->atts, &def_attr_result)) == RLM_MODULE_OK){
 983                                 if ((def_attr_msg = ldap_first_entry(conn->ld,def_attr_result))){
 984                                         if ((check_tmp = ldap_pairget(conn->ld,def_attr_msg,inst->check_item_map,check_pairs)))
 985                                                 pairadd(check_pairs,check_tmp);
 986                                         if ((reply_tmp = ldap_pairget(conn->ld,def_attr_msg,inst->reply_item_map,reply_pairs)))
 987                                                 pairadd(reply_pairs,reply_tmp);
 988                                 }
 989                                 ldap_msgfree(def_attr_result);
 990                         } else
 991                                 DEBUG("rlm_ldap: profile_attribute search failed");
 992                         ldap_value_free(vals);
 993                 }
 994         }
 995         if (inst->cache_timeout >0)
 996                 ldap_disable_cache(conn->ld);
 997         if (inst->passwd_attr && strlen(inst->passwd_attr)){
 998                 VALUE_PAIR *passwd_item;
 999
1000                 if ((passwd_item = pairfind(request->config_items, PW_PASSWORD)) == NULL){
1001                         char **passwd_vals;
1002                         char *passwd_val = NULL;
1003                         int passwd_len;
1004
1005                         if ((passwd_vals = ldap_get_values(conn->ld,msg,inst->passwd_attr)) != NULL){
1006                                 unsigned int i=0;
1007                                 while(passwd_vals[i] != NULL){
1008                                         if (strlen(passwd_vals[i])){
1009                                                 passwd_val = passwd_vals[i];
1010
1011                                                 if (inst->passwd_hdr && strlen(inst->passwd_hdr)){
1012                                                         passwd_val = strstr(passwd_val,inst->passwd_hdr);
1013                                                         if (passwd_val != NULL)
1014                                                                 passwd_val += strlen(inst->passwd_hdr);
1015                                                         else
1016                                                                 DEBUG("rlm_ldap: Password header not found in password %s for user %s", passwd_vals[0],request->username->strvalue);
1017                                                 }
1018                                                 if (passwd_val){
1019                                                         if ((passwd_item = paircreate(PW_PASSWORD,PW_TYPE_STRING)) == NULL){
1020                                                                 radlog(L_ERR|L_CONS, "no memory");
1021                                                                 ldap_value_free(passwd_vals);
1022                                                                 ldap_msgfree(result);
1023                                                                 ldap_release_conn(conn_id,inst->conns);
1024                                                                 return RLM_MODULE_FAIL;
1025                                                         }
1026                                                         passwd_len = strlen(passwd_val);
1027                                                         strncpy(passwd_item->strvalue,passwd_val,MAX_STRING_LEN - 1);
1028                                                         passwd_item->length = (passwd_len > (MAX_STRING_LEN - 1)) ? (MAX_STRING_LEN - 1) : passwd_len;
1029                                                         pairadd(&request->config_items,passwd_item);
1030                                                         DEBUG("rlm_ldap: Added password %s in check items",passwd_item->strvalue);
1031                                                 }
1032                                         }
1033                                         i++;
1034                                 }
1035                                 ldap_value_free(passwd_vals);
1036                         }
1037                 }
1038         }
1039
1040
1041
1042         DEBUG("rlm_ldap: looking for check items in directory...");
1043
1044         if ((check_tmp = ldap_pairget(conn->ld, msg, inst->check_item_map,check_pairs)) != NULL)
1045                 pairadd(check_pairs, check_tmp);
1046
1047
1048         DEBUG("rlm_ldap: looking for reply items in directory...");
1049
1050
1051         if ((reply_tmp = ldap_pairget(conn->ld, msg, inst->reply_item_map,reply_pairs)) != NULL)
1052                 pairadd(reply_pairs, reply_tmp);
1053
1054        if (inst->do_comp && paircmp(request,request->packet->vps,*check_pairs,reply_pairs) != 0){
1055                 DEBUG("rlm_ldap: Pairs do not match. Rejecting user.");
1056                 snprintf(module_fmsg,sizeof(module_fmsg),"rlm_ldap: Pairs do not match");
1057                 module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
1058                 pairadd(&request->packet->vps, module_fmsg_vp);
1059
1060                 return RLM_MODULE_REJECT;
1061         }
1062
1063         /*
1064          * Module should default to LDAP authentication if no Auth-Type
1065          * specified
1066          */
1067         if (pairfind(*check_pairs, PW_AUTHTYPE) == NULL)
1068                 pairadd(check_pairs, pairmake("Auth-Type", "LDAP", T_OP_EQ));
1069
1070
1071         DEBUG("rlm_ldap: user %s authorized to use remote access",
1072               request->username->strvalue);
1073         ldap_msgfree(result);
1074         ldap_release_conn(conn_id,inst->conns);
1075
1076         return RLM_MODULE_OK;
1077 }
1078
1079 /*****************************************************************************
1080  *
1081  *      Function: rlm_ldap_authenticate
1082  *
1083  *      Purpose: Check the user's password against ldap database
1084  *
1085  *****************************************************************************/
1086 static int
1087 ldap_authenticate(void *instance, REQUEST * request)
1088 {
1089         LDAP           *ld_user;
1090         LDAPMessage    *result, *msg;
1091         ldap_instance  *inst = instance;
1092         char           *user_dn, *attrs[] = {"uid", NULL};
1093         char            filter[MAX_AUTH_QUERY_LEN];
1094         char            basedn[1024];
1095         int             res;
1096         VALUE_PAIR     *vp_user_dn;
1097         VALUE_PAIR      *module_fmsg_vp;
1098         char            module_fmsg[MAX_STRING_LEN];
1099         LDAP_CONN       *conn;
1100         int             conn_id = -1;
1101
1102         DEBUG("rlm_ldap: - authenticate");
1103         /*
1104          * Ensure that we're being passed a plain-text password, and not
1105          * anything else.
1106          */
1107
1108         if (!request->username) {
1109                 radlog(L_AUTH, "rlm_ldap: Attribute \"User-Name\" is required for authentication.\n");
1110                 return RLM_MODULE_INVALID;
1111         }
1112
1113         if (!request->password){
1114                 radlog(L_AUTH, "rlm_ldap: Attribute \"User-Password\" is required for authentication.");
1115                 return RLM_MODULE_INVALID;
1116         }
1117
1118         if(request->password->attribute != PW_PASSWORD) {
1119                 radlog(L_AUTH, "rlm_ldap: Attribute \"User-Password\" is required for authentication. Cannot use \"%s\".", request->password->name);
1120                 return RLM_MODULE_INVALID;
1121         }
1122
1123         if (request->password->length == 0) {
1124                 radlog(L_ERR, "rlm_ldap: empty password supplied");
1125                 return RLM_MODULE_INVALID;
1126         }
1127
1128         DEBUG("rlm_ldap: login attempt by \"%s\" with password \"%s\"",
1129                request->username->strvalue, request->password->strvalue);
1130
1131         while((vp_user_dn = pairfind(request->packet->vps, LDAP_USERDN)) == NULL) {
1132                 if (!radius_xlat(filter, sizeof(filter), inst->filter,
1133                                 request, NULL)) {
1134                         radlog (L_ERR, "rlm_ldap: unable to create filter.\n");
1135                         return RLM_MODULE_INVALID;
1136                 }
1137
1138                 if (!radius_xlat(basedn, sizeof(basedn), inst->basedn,
1139                                 request, NULL)) {
1140                         radlog (L_ERR, "rlm_ldap: unable to create basedn.\n");
1141                         return RLM_MODULE_INVALID;
1142                 }
1143
1144                 if ((conn_id = ldap_get_conn(inst->conns,&conn,inst)) == -1){
1145                         radlog(L_ERR, "rlm_ldap: All ldap connections are in use");
1146                         return RLM_MODULE_FAIL;
1147                 }
1148                 if ((res = perform_search(instance, conn, basedn, LDAP_SCOPE_SUBTREE, filter, attrs, &result)) != RLM_MODULE_OK) {
1149                         if (res == RLM_MODULE_NOTFOUND){
1150                                 snprintf(module_fmsg,sizeof(module_fmsg),"rlm_ldap: User not found");
1151                                 module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
1152                                 pairadd(&request->packet->vps, module_fmsg_vp);
1153                         }
1154                         ldap_release_conn(conn_id,inst->conns);
1155                         return (res);
1156                 }
1157                 if ((msg = ldap_first_entry(conn->ld, result)) == NULL) {
1158                         ldap_msgfree(result);
1159                         ldap_release_conn(conn_id,inst->conns);
1160                         return RLM_MODULE_FAIL;
1161                 }
1162                 if ((user_dn = ldap_get_dn(conn->ld, msg)) == NULL) {
1163                         DEBUG("rlm_ldap: ldap_get_dn() failed");
1164                         ldap_msgfree(result);
1165                         ldap_release_conn(conn_id,inst->conns);
1166                         return RLM_MODULE_FAIL;
1167                 }
1168                 ldap_release_conn(conn_id,inst->conns);
1169                 pairadd(&request->packet->vps, pairmake("Ldap-UserDn", user_dn, T_OP_EQ));
1170                 ldap_memfree(user_dn);
1171                 ldap_msgfree(result);
1172         }
1173
1174         user_dn = vp_user_dn->strvalue;
1175
1176         DEBUG("rlm_ldap: user DN: %s", user_dn);
1177
1178         ld_user = ldap_connect(instance, user_dn, request->password->strvalue,
1179                                1, &res);
1180         if (ld_user == NULL){
1181                 snprintf(module_fmsg,sizeof(module_fmsg),"rlm_ldap: Bind as user failed");
1182                 module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
1183                 pairadd(&request->packet->vps, module_fmsg_vp);
1184                 return (res);
1185         }
1186
1187         DEBUG("rlm_ldap: user %s authenticated succesfully",
1188               request->username->strvalue);
1189         ldap_unbind_s(ld_user);
1190
1191         return RLM_MODULE_OK;
1192 }
1193
1194 static LDAP    *
1195 ldap_connect(void *instance, const char *dn, const char *password, int auth, int *result)
1196 {
1197         ldap_instance  *inst = instance;
1198         LDAP           *ld;
1199         int             msgid, rc, ldap_version;
1200         int             ldap_errno = 0;
1201         LDAPMessage    *res;
1202
1203         DEBUG("rlm_ldap: (re)connect to %s:%d, authentication %d", inst->server, inst->port, auth);
1204         if ((ld = ldap_init(inst->server, inst->port)) == NULL) {
1205                 radlog(L_ERR, "rlm_ldap: ldap_init() failed");
1206                 *result = RLM_MODULE_FAIL;
1207                 return (NULL);
1208         }
1209         if (ldap_set_option(ld, LDAP_OPT_NETWORK_TIMEOUT, (void *) &(inst->net_timeout)) != LDAP_OPT_SUCCESS) {
1210                 radlog(L_ERR, "rlm_ldap: Could not set LDAP_OPT_NETWORK_TIMEOUT %ld.%ld", inst->net_timeout.tv_sec, inst->net_timeout.tv_usec);
1211         }
1212         if (ldap_set_option(ld, LDAP_OPT_TIMELIMIT, (void *) &(inst->timelimit)) != LDAP_OPT_SUCCESS) {
1213                 radlog(L_ERR, "rlm_ldap: Could not set LDAP_OPT_TIMELIMIT %d", inst->timelimit);
1214         }
1215         if (inst->ldap_debug && ldap_set_option(NULL, LDAP_OPT_DEBUG_LEVEL, &(inst->ldap_debug)) != LDAP_OPT_SUCCESS) {
1216                 radlog(L_ERR, "rlm_ldap: Could not set LDAP_OPT_DEBUG_LEVEL %d", inst->ldap_debug);
1217         }
1218 #ifdef HAVE_TLS
1219         if (inst->tls_mode && ldap_set_option(ld, LDAP_OPT_X_TLS, (void *) &(inst->tls_mode)) != LDAP_OPT_SUCCESS) {
1220                 radlog(L_ERR, "rlm_ldap: Could not set LDAP_OPT_X_TLS_TRY");
1221         }
1222 #endif
1223
1224 #ifdef HAVE_LDAP_START_TLS
1225         if (inst->start_tls) {
1226                 DEBUG("rlm_ldap: try to start TLS");
1227                 ldap_version = LDAP_VERSION3;
1228                 if (ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, &ldap_version) == LDAP_SUCCESS) {
1229                         rc = ldap_start_tls_s(ld, NULL, NULL);
1230                         if (rc != LDAP_SUCCESS) {
1231                                 DEBUG("rlm_ldap: ldap_start_tls_s()");
1232                                 ldap_get_option(ld, LDAP_OPT_ERROR_NUMBER, &ldap_errno);
1233                                 radlog(L_ERR, "rlm_ldap: could not start TLS %s", ldap_err2string(ldap_errno));
1234                                 *result = RLM_MODULE_FAIL;
1235                                 ldap_unbind_s(ld);
1236                                 return (NULL);
1237                         }
1238                 }
1239         }
1240 #endif /* HAVE_LDAP_START_TLS */
1241
1242         DEBUG("rlm_ldap: bind as %s/%s", dn, password);
1243         msgid = ldap_simple_bind(ld, dn, password);
1244         if (msgid == -1) {
1245                 DEBUG("rlm_ldap: ldap_simple_bind()");
1246                 ldap_get_option(ld, LDAP_OPT_ERROR_NUMBER, &ldap_errno);
1247                 radlog(L_ERR, "rlm_ldap: %s bind failed: %s", dn, ldap_err2string(ldap_errno));
1248                 *result = RLM_MODULE_FAIL;
1249                 ldap_unbind_s(ld);
1250                 return (NULL);
1251         }
1252         DEBUG("rlm_ldap: waiting for bind result ...");
1253
1254         rc = ldap_result(ld, msgid, 1, &(inst->timeout), &res);
1255
1256         if(rc < 1) {
1257                 DEBUG("rlm_ldap: ldap_result()");
1258                 ldap_get_option(ld, LDAP_OPT_ERROR_NUMBER, &ldap_errno);
1259                 radlog(L_ERR, "rlm_ldap: %s bind failed: %s", dn, (rc == 0) ? "timeout" : ldap_err2string(ldap_errno));
1260                 *result = RLM_MODULE_FAIL;
1261                 ldap_unbind_s(ld);
1262                 return (NULL);
1263         }
1264         ldap_errno = ldap_result2error(ld, res, 1);
1265         switch (ldap_errno) {
1266         case LDAP_SUCCESS:
1267                 *result = RLM_MODULE_OK;
1268                 break;
1269
1270         case LDAP_INVALID_CREDENTIALS:
1271                 if (auth)
1272                         *result = RLM_MODULE_REJECT;
1273                 else {
1274                         radlog(L_ERR, "rlm_ldap: LDAP login failed: check login, password settings in ldap section of radiusd.conf");
1275                         *result = RLM_MODULE_FAIL;
1276                 }
1277                 break;
1278
1279         default:
1280                 radlog(L_ERR,"rlm_ldap: %s bind failed %s", dn, ldap_err2string(ldap_errno));
1281                 *result = RLM_MODULE_FAIL;
1282         }
1283
1284         if (*result != RLM_MODULE_OK) {
1285                 ldap_unbind_s(ld);
1286                 ld = NULL;
1287         }
1288         return ld;
1289 }
1290
1291 /*****************************************************************************
1292  *
1293  *      Detach from the LDAP server and cleanup internal state.
1294  *
1295  *****************************************************************************/
1296 static int
1297 ldap_detach(void *instance)
1298 {
1299         ldap_instance  *inst = instance;
1300         TLDAP_RADIUS *pair, *nextpair;
1301
1302         if (inst->server)
1303                 free((char *) inst->server);
1304         if (inst->login)
1305                 free((char *) inst->login);
1306         if (inst->password)
1307                 free((char *) inst->password);
1308         if (inst->basedn)
1309                 free((char *) inst->basedn);
1310         if (inst->access_group)
1311                 free((char *) inst->access_group);
1312         if (inst->dictionary_mapping)
1313                 free(inst->dictionary_mapping);
1314         if (inst->filter)
1315                 free((char *) inst->filter);
1316         if (inst->passwd_hdr)
1317                 free((char *) inst->passwd_hdr);
1318         if (inst->passwd_attr)
1319                 free((char *) inst->passwd_attr);
1320         if (inst->groupname_attr)
1321                 free((char *) inst->groupname_attr);
1322         if (inst->groupmemb_filt)
1323                 free((char *) inst->groupmemb_filt);
1324         if (inst->conns){
1325                 int i=0;
1326
1327                 for(;i<inst->num_conns;i++){
1328                         if (inst->conns[i].ld){
1329                                 if (inst->cache_timeout >0)
1330                                         ldap_destroy_cache(inst->conns[i].ld);
1331                                 ldap_unbind_s(inst->conns[i].ld);
1332                         }
1333                         pthread_mutex_destroy(&inst->conns[i].mutex);
1334                 }
1335                 free(inst->conns);
1336         }
1337
1338         pair = inst->check_item_map;
1339
1340         while (pair != NULL) {
1341                 nextpair = pair->next;
1342                 free(pair->attr);
1343                 free(pair->radius_attr);
1344                 free(pair);
1345                 pair = nextpair;
1346         }
1347
1348         pair = inst->reply_item_map;
1349
1350         while (pair != NULL) {
1351                 nextpair = pair->next;
1352                 free(pair->attr);
1353                 free(pair->radius_attr);
1354                 free(pair);
1355                 pair = nextpair;
1356         }
1357
1358         paircompare_unregister(PW_LDAP_GROUP, ldap_groupcmp);
1359         xlat_unregister(inst->xlat_name,ldap_xlat);
1360         free(inst->xlat_name);
1361
1362         free(inst);
1363
1364         return 0;
1365 }
1366
1367 #ifdef FIELDCPY
1368 static void
1369 fieldcpy(char *string, char **uptr)
1370 {
1371         char           *ptr;
1372
1373         ptr = *uptr;
1374         while (*ptr == ' ' || *ptr == '\t') {
1375                 ptr++;
1376         }
1377         if (*ptr == '"') {
1378                 ptr++;
1379                 while (*ptr != '"' && *ptr != '\0' && *ptr != '\n') {
1380                         *string++ = *ptr++;
1381                 }
1382                 *string = '\0';
1383                 if (*ptr == '"') {
1384                         ptr++;
1385                 }
1386                 *uptr = ptr;
1387                 return;
1388         }
1389         while (*ptr != ' ' && *ptr != '\t' && *ptr != '\0' && *ptr != '\n' &&
1390                *ptr != '=' && *ptr != ',') {
1391                 *string++ = *ptr++;
1392         }
1393         *string = '\0';
1394         *uptr = ptr;
1395         return;
1396 }
1397 #endif
1398 /*****************************************************************************
1399  *      Get RADIUS attributes from LDAP object
1400  *      ( according to draft-adoba-radius-05.txt
1401  *        <http://www.ietf.org/internet-drafts/draft-adoba-radius-05.txt> )
1402  *
1403  *****************************************************************************/
1404
1405 static VALUE_PAIR *
1406 ldap_pairget(LDAP * ld, LDAPMessage * entry,
1407              TLDAP_RADIUS * item_map, VALUE_PAIR **pairs)
1408 {
1409         char          **vals;
1410         int             vals_count;
1411         int             vals_idx;
1412         char           *ptr;
1413         TLDAP_RADIUS   *element;
1414         LRAD_TOKEN      token;
1415         int             is_generic_attribute;
1416         char            value[64];
1417         VALUE_PAIR     *pairlist = NULL;
1418         VALUE_PAIR     *newpair = NULL;
1419
1420         /* check if there is a mapping from this LDAP attribute to a RADIUS attribute */
1421         for (element = item_map; element != NULL; element = element->next) {
1422         if ((vals = ldap_get_values(ld,entry,element->attr)) != NULL){
1423                         /* check whether this is a one-to-one-mapped ldap attribute or a generic
1424                            attribute and set flag accordingly */
1425
1426                         if (strcasecmp(element->radius_attr, GENERIC_ATTRIBUTE_ID)==0)
1427                                 is_generic_attribute = 1;
1428                         else
1429                                 is_generic_attribute = 0;
1430
1431                         /* find out how many values there are for the attribute and extract all of them */
1432
1433                         vals_count = ldap_count_values(vals);
1434
1435                         for (vals_idx = 0; vals_idx < vals_count; vals_idx++) {
1436                                 ptr = vals[vals_idx];
1437
1438                                 if (is_generic_attribute) {
1439                                         /* this is a generic attribute */
1440                                         LRAD_TOKEN dummy; /* makes pairread happy */
1441
1442                                         /* not sure if using pairread here is ok ... */
1443                                         if ( (newpair = pairread(&ptr, &dummy)) != NULL) {
1444                                                 DEBUG("rlm_ldap: extracted attribute %s from generic item %s",
1445                                                       newpair->name, vals[vals_idx]);
1446                                                 if (! vals_idx){
1447                                                         pairdelete(pairs,newpair->attribute);
1448                                                 }
1449                                                 pairadd(&pairlist, newpair);
1450                                         } else {
1451                                                 radlog(L_ERR, "rlm_ldap: parsing %s failed: %s",
1452                                                        element->attr, vals[vals_idx]);
1453                                         }
1454                                 } else {
1455                                         /* this is a one-to-one-mapped attribute */
1456                                         token = gettoken(&ptr, value, sizeof(value));
1457                                         if (token < T_EQSTART || token > T_EQEND) {
1458                                                 token = T_OP_EQ;
1459                                         } else {
1460                                                 gettoken(&ptr, value, sizeof(value));
1461                                         }
1462                                         if (value[0] == 0) {
1463                                                 DEBUG("rlm_ldap: Attribute %s has no value", element->attr);
1464                                                 break;
1465                                         }
1466                                         DEBUG("rlm_ldap: Adding %s as %s, value %s & op=%d", element->attr, element->radius_attr, value, token);
1467                                                 if ((newpair = pairmake(element->radius_attr, value, token)) == NULL)
1468                                                 continue;
1469                                         if (! vals_idx){
1470                                                 pairdelete(pairs,newpair->attribute);
1471                                         }
1472                                         pairadd(&pairlist, newpair);
1473                                 }
1474                         }
1475                         ldap_value_free(vals);
1476                 }
1477         }
1478
1479         return (pairlist);
1480 }
1481
1482 /* globally exported name */
1483 module_t        rlm_ldap = {
1484         "LDAP",
1485         RLM_TYPE_THREAD_SAFE,   /* type: reserved        */
1486         NULL,                   /* initialization        */
1487         ldap_instantiate,       /* instantiation         */
1488         {
1489                 ldap_authenticate,      /* authentication        */
1490                 ldap_authorize,         /* authorization         */
1491                 NULL,                   /* preaccounting         */
1492                 NULL,                   /* accounting            */
1493                 NULL                    /* checksimul            */
1494         },
1495         ldap_detach,            /* detach                */
1496         NULL,                   /* destroy               */
1497 };