git.sur5r.net Git - openldap/blob - servers/slapd/back-meta/bind.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1999-2005 The OpenLDAP Foundation.
   5  * Portions Copyright 2001-2003 Pierangelo Masarati.
   6  * Portions Copyright 1999-2003 Howard Chu.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17 /* ACKNOWLEDGEMENTS:
  18  * This work was initially developed by the Howard Chu for inclusion
  19  * in OpenLDAP Software and subsequently enhanced by Pierangelo
  20  * Masarati.
  21  */
  22
  23 #include "portable.h"
  24
  25 #include <stdio.h>
  26
  27 #include <ac/socket.h>
  28 #include <ac/string.h>
  29
  30
  31 #define AVL_INTERNAL
  32 #include "slap.h"
  33 #include "../back-ldap/back-ldap.h"
  34 #include "back-meta.h"
  35
  36 static LDAP_REBIND_PROC meta_back_rebind;
  37
  38 static int
  39 meta_back_do_single_bind(
  40                 struct metaconn         *lc,
  41                 Operation               *op,
  42                 SlapReply               *rs,
  43                 int                     candidate
  44 );
  45
  46 int
  47 meta_back_bind( Operation *op, SlapReply *rs )
  48 {
  49         struct metainfo *li = ( struct metainfo * )op->o_bd->be_private;
  50         struct metaconn *lc;
  51
  52         int             rc = LDAP_OTHER,
  53                         i, gotit = 0, ndnlen, isroot = 0;
  54
  55         char            *candidates = meta_back_candidates_get( op );
  56
  57         rs->sr_err = LDAP_SUCCESS;
  58
  59         Debug( LDAP_DEBUG_ARGS, "meta_back_bind: dn: %s.\n%s%s",
  60                         op->o_req_dn.bv_val, "", "" );
  61
  62         if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
  63                 isroot = 1;
  64                 ber_dupbv( &op->orb_edn, be_root_dn( op->o_bd ) );
  65         }
  66
  67         /* we need meta_back_getconn() not send result even on error,
  68          * because we want to intercept the error and make it
  69          * invalidCredentials */
  70         lc = meta_back_getconn( op, rs, NULL, LDAP_BACK_DONTSEND );
  71         if ( !lc ) {
  72                 Debug( LDAP_DEBUG_ANY,
  73                                 "meta_back_bind: no target "
  74                                 "for dn \"%s\" (%d: %s).\n",
  75                                 op->o_req_dn.bv_val, rs->sr_err,
  76                                 rs->sr_text ? rs->sr_text : "" );
  77                 /* FIXME: there might be cases where we don't want
  78                  * to map the error onto invalidCredentials */
  79                 switch ( rs->sr_err ) {
  80                 case LDAP_NO_SUCH_OBJECT:
  81                 case LDAP_UNWILLING_TO_PERFORM:
  82                         rs->sr_err = LDAP_INVALID_CREDENTIALS;
  83                         rs->sr_text = NULL;
  84                         break;
  85                 }
  86                 send_ldap_result( op, rs );
  87                 return rs->sr_err;
  88         }
  89
  90         /*
  91          * Each target is scanned ...
  92          */
  93         lc->mc_bound_target = META_BOUND_NONE;
  94         ndnlen = op->o_req_ndn.bv_len;
  95         for ( i = 0; i < li->mi_ntargets; i++ ) {
  96                 int             lerr;
  97                 struct berval   orig_dn = op->o_req_dn;
  98                 struct berval   orig_ndn = op->o_req_ndn;
  99                 struct berval   orig_cred = op->orb_cred;
 100                 int             orig_method = op->orb_method;
 101
 102
 103                 /*
 104                  * Skip non-candidates
 105                  */
 106                 if ( candidates[ i ] != META_CANDIDATE ) {
 107                         continue;
 108                 }
 109
 110                 if ( gotit == 0 ) {
 111                         gotit = 1;
 112
 113                 } else if ( isroot == 0 ) {
 114                         /*
 115                          * A bind operation is expected to have
 116                          * ONE CANDIDATE ONLY!
 117                          */
 118                         Debug( LDAP_DEBUG_ANY,
 119                                         "==>meta_back_bind: more than one"
 120                                         " candidate is trying to bind...\n",
 121                                         0, 0, 0 );
 122                 }
 123
 124                 if ( isroot && !BER_BVISNULL( &li->mi_targets[ i ]->mt_pseudorootdn ) )
 125                 {
 126                         op->o_req_dn = li->mi_targets[ i ]->mt_pseudorootdn;
 127                         op->o_req_ndn = li->mi_targets[ i ]->mt_pseudorootdn;
 128                         op->orb_cred = li->mi_targets[ i ]->mt_pseudorootpw;
 129                         op->orb_method = LDAP_AUTH_SIMPLE;
 130                 }
 131
 132                 lerr = meta_back_do_single_bind( lc, op, rs, i );
 133                 if ( lerr != LDAP_SUCCESS ) {
 134                         rs->sr_err = lerr;
 135                         candidates[ i ] = META_NOT_CANDIDATE;
 136 #if 0
 137                         ( void )meta_clear_one_candidate( &lc->mc_conns[ i ] );
 138 #endif
 139
 140                 } else {
 141                         rc = LDAP_SUCCESS;
 142                 }
 143
 144                 op->o_req_dn = orig_dn;
 145                 op->o_req_ndn = orig_ndn;
 146                 op->orb_cred = orig_cred;
 147                 op->orb_method = orig_method;
 148         }
 149
 150         if ( isroot ) {
 151                 lc->mc_bound_target = META_BOUND_ALL;
 152         }
 153
 154         /*
 155          * rc is LDAP_SUCCESS if at least one bind succeeded,
 156          * err is the last error that occurred during a bind;
 157          * if at least (and at most?) one bind succeedes, fine.
 158          */
 159         if ( rc != LDAP_SUCCESS ) {
 160
 161                 /*
 162                  * deal with bind failure ...
 163                  */
 164
 165                 /*
 166                  * no target was found within the naming context,
 167                  * so bind must fail with invalid credentials
 168                  */
 169                 if ( rs->sr_err == LDAP_SUCCESS && gotit == 0 ) {
 170                         rs->sr_err = LDAP_INVALID_CREDENTIALS;
 171                 }
 172
 173                 rs->sr_err = slap_map_api2result( rs );
 174                 send_ldap_result( op, rs );
 175                 return rs->sr_err;
 176         }
 177
 178         return LDAP_SUCCESS;
 179 }
 180
 181 /*
 182  * meta_back_do_single_bind
 183  *
 184  * attempts to perform a bind with creds
 185  */
 186 static int
 187 meta_back_do_single_bind(
 188                 struct metaconn         *lc,
 189                 Operation               *op,
 190                 SlapReply               *rs,
 191                 int                     candidate
 192 )
 193 {
 194         struct metainfo         *li = ( struct metainfo * )op->o_bd->be_private;
 195         struct berval           mdn = BER_BVNULL;
 196         dncookie                dc;
 197         struct metasingleconn   *lsc = &lc->mc_conns[ candidate ];
 198         int                     msgid;
 199
 200         /*
 201          * Rewrite the bind dn if needed
 202          */
 203         dc.rwmap = &li->mi_targets[ candidate ]->mt_rwmap;
 204         dc.conn = op->o_conn;
 205         dc.rs = rs;
 206         dc.ctx = "bindDN";
 207
 208         if ( ldap_back_dn_massage( &dc, &op->o_req_dn, &mdn ) ) {
 209                 send_ldap_result( op, rs );
 210                 return -1;
 211         }
 212
 213         /* FIXME: this fixes the bind problem right now; we need
 214          * to use the asynchronous version to get the "matched"
 215          * and more in case of failure ... */
 216         /* FIXME: should be check if at least some of the op->o_ctrls
 217          * can/should be passed? */
 218         rs->sr_err = ldap_sasl_bind( lsc->msc_ld, mdn.bv_val,
 219                         LDAP_SASL_SIMPLE, &op->orb_cred,
 220                         op->o_ctrls, NULL, &msgid );
 221         if ( rs->sr_err == LDAP_SUCCESS ) {
 222                 LDAPMessage     *res;
 223                 struct timeval  tv = { 0, 0 };
 224                 int             rc;
 225                 int             nretries = 0;
 226
 227                 /*
 228                  * handle response!!!
 229                  */
 230 retry:;
 231                 switch ( ldap_result( lsc->msc_ld, msgid, 0, &tv, &res ) ) {
 232                 case 0:
 233                         if ( ++nretries <= META_BIND_NRETRIES ) {
 234                                 ldap_pvt_thread_yield();
 235                                 tv.tv_sec = 0;
 236                                 tv.tv_usec = META_BIND_TIMEOUT;
 237                                 goto retry;
 238                         }
 239                         rs->sr_err = LDAP_BUSY;
 240                         break;
 241
 242                 case -1:
 243                         ldap_get_option( lsc->msc_ld, LDAP_OPT_ERROR_NUMBER,
 244                                         &rs->sr_err );
 245                         break;
 246
 247                 default:
 248                         rc = ldap_parse_result( lsc->msc_ld, res, &rs->sr_err,
 249                                         NULL, NULL, NULL, NULL, 1 );
 250                         if ( rc != LDAP_SUCCESS ) {
 251                                 rs->sr_err = rc;
 252                         }
 253                         break;
 254                 }
 255         }
 256
 257         if ( rs->sr_err != LDAP_SUCCESS ) {
 258                 rs->sr_err = slap_map_api2result( rs );
 259                 goto return_results;
 260         }
 261
 262         if ( !BER_BVISNULL( &lsc->msc_bound_ndn ) ) {
 263                 ber_memfree( lsc->msc_bound_ndn.bv_val );
 264         }
 265         ber_dupbv( &lsc->msc_bound_ndn, &op->o_req_dn );
 266         lsc->msc_bound = META_BOUND;
 267         lc->mc_bound_target = candidate;
 268
 269         if ( LDAP_BACK_SAVECRED( li ) ) {
 270                 if ( !BER_BVISNULL( &lsc->msc_cred ) ) {
 271                         /* destroy sensitive data */
 272                         memset( lsc->msc_cred.bv_val, 0, lsc->msc_cred.bv_len );
 273                         ber_memfree( lsc->msc_cred.bv_val );
 274                 }
 275                 ber_dupbv( &lsc->msc_cred, &op->orb_cred );
 276                 ldap_set_rebind_proc( lsc->msc_ld, meta_back_rebind, lsc );
 277         }
 278
 279         if ( li->mi_cache.ttl != META_DNCACHE_DISABLED
 280                         && op->o_req_ndn.bv_len != 0 ) {
 281                 ( void )meta_dncache_update_entry( &li->mi_cache,
 282                                 &op->o_req_ndn, candidate );
 283         }
 284
 285 return_results:;
 286
 287         if ( mdn.bv_val != op->o_req_dn.bv_val ) {
 288                 free( mdn.bv_val );
 289         }
 290
 291         return rs->sr_err;
 292 }
 293
 294 /*
 295  * meta_back_dobind
 296  */
 297 int
 298 meta_back_dobind( struct metaconn *lc, Operation *op, ldap_back_send_t sendok )
 299 {
 300         struct metasingleconn   *lsc;
 301         int                     bound = 0, i;
 302
 303         char            *candidates = meta_back_candidates_get( op );
 304
 305         /*
 306          * all the targets are bound as pseudoroot
 307          */
 308         if ( lc->mc_bound_target == META_BOUND_ALL ) {
 309                 return 1;
 310         }
 311
 312         for ( i = 0, lsc = lc->mc_conns; !META_LAST( lsc ); ++i, ++lsc ) {
 313                 int             rc;
 314                 struct berval   cred = BER_BVC("");
 315                 int             msgid;
 316
 317                 /*
 318                  * Not a candidate or something wrong with this target ...
 319                  */
 320                 if ( lsc->msc_ld == NULL ) {
 321                         continue;
 322                 }
 323
 324                 /*
 325                  * If the target is already bound it is skipped
 326                  */
 327                 if ( lsc->msc_bound == META_BOUND && lc->mc_bound_target == i ) {
 328                         ++bound;
 329                         continue;
 330                 }
 331
 332                 /*
 333                  * Otherwise an anonymous bind is performed
 334                  * (note: if the target was already bound, the anonymous
 335                  * bind clears the previous bind).
 336                  */
 337                 if ( !BER_BVISNULL( &lsc->msc_bound_ndn ) ) {
 338                         ber_memfree( lsc->msc_bound_ndn.bv_val );
 339                         BER_BVZERO( &lsc->msc_bound_ndn );
 340                 }
 341
 342                 if ( /* FIXME: need li ... li->savecred && */
 343                                 !BER_BVISNULL( &lsc->msc_cred ) )
 344                 {
 345                         /* destroy sensitive data */
 346                         memset( lsc->msc_cred.bv_val, 0, lsc->msc_cred.bv_len );
 347                         ber_memfree( lsc->msc_cred.bv_val );
 348                         BER_BVZERO( &lsc->msc_cred );
 349                 }
 350
 351                 /* FIXME: should we check if at least some of the op->o_ctrls
 352                  * can/should be passed? */
 353                 rc = ldap_sasl_bind( lsc->msc_ld, "", LDAP_SASL_SIMPLE, &cred,
 354                                 NULL, NULL, &msgid );
 355                 if ( rc == LDAP_SUCCESS ) {
 356                         LDAPMessage     *res;
 357                         struct timeval  tv = { 0, 0 };
 358                         int             err;
 359                         int             nretries = 0;
 360
 361                         /*
 362                          * handle response!!!
 363                          */
 364 retry:;
 365                         switch ( ldap_result( lsc->msc_ld, msgid, 0, &tv, &res ) ) {
 366                         case 0:
 367                                 if ( ++nretries <= META_BIND_NRETRIES ) {
 368                                         ldap_pvt_thread_yield();
 369                                         tv.tv_sec = 0;
 370                                         tv.tv_usec = META_BIND_TIMEOUT;
 371                                         goto retry;
 372                                 }
 373
 374                                 rc = LDAP_BUSY;
 375                                 break;
 376
 377                         case -1:
 378                                 ldap_get_option( lsc->msc_ld, LDAP_OPT_ERROR_NUMBER,
 379                                                 &rc );
 380                                 break;
 381
 382                         default:
 383                                 rc = ldap_parse_result( lsc->msc_ld, res, &err,
 384                                                 NULL, NULL, NULL, NULL, 1 );
 385                                 if ( rc == LDAP_SUCCESS ) {
 386                                         rc = err;
 387                                 }
 388                                 break;
 389                         }
 390                 }
 391
 392                 if ( rc != LDAP_SUCCESS ) {
 393                         Debug( LDAP_DEBUG_ANY,
 394                                         "==>meta_back_dobind: (anonymous)"
 395                                         " bind failed"
 396                                         " with error %d (%s)\n",
 397                                         rc, ldap_err2string( rc ), 0 );
 398
 399                         /*
 400                          * null cred bind should always succeed
 401                          * as anonymous, so a failure means
 402                          * the target is no longer candidate possibly
 403                          * due to technical reasons (remote host down?)
 404                          * so better clear the handle
 405                          */
 406                         candidates[ i ] = META_NOT_CANDIDATE;
 407 #if 0
 408                         ( void )meta_clear_one_candidate( lsc );
 409 #endif
 410                         continue;
 411                 } /* else */
 412
 413                 lsc->msc_bound = META_ANONYMOUS;
 414                 ++bound;
 415         }
 416
 417         return( bound > 0 );
 418 }
 419
 420 /*
 421  *
 422  */
 423 int
 424 meta_back_is_valid( struct metaconn *lc, int candidate )
 425 {
 426         struct metasingleconn   *lsc;
 427         int                     i;
 428
 429         assert( lc );
 430
 431         if ( candidate < 0 ) {
 432                 return 0;
 433         }
 434
 435         for ( i = 0, lsc = lc->mc_conns; !META_LAST( lsc ) && i < candidate;
 436                         ++i, ++lsc );
 437
 438         if ( !META_LAST( lsc ) ) {
 439                 return ( lsc->msc_ld != NULL );
 440         }
 441
 442         return 0;
 443 }
 444
 445 /*
 446  * meta_back_rebind
 447  *
 448  * This is a callback used for chasing referrals using the same
 449  * credentials as the original user on this session.
 450  */
 451 static int
 452 meta_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 453         ber_int_t msgid, void *params )
 454 {
 455         struct metasingleconn   *lsc = params;
 456
 457         return ldap_sasl_bind_s( ld, lsc->msc_bound_ndn.bv_val,
 458                         LDAP_SASL_SIMPLE, &lsc->msc_cred,
 459                         NULL, NULL, NULL );
 460 }
 461
 462 /*
 463  * FIXME: error return must be handled in a cleaner way ...
 464  */
 465 int
 466 meta_back_op_result(
 467         struct metaconn *lc,
 468         Operation       *op,
 469         SlapReply       *rs,
 470         int             candidate )
 471 {
 472         int                     i,
 473                                 rerr = LDAP_SUCCESS;
 474         struct metasingleconn   *lsc;
 475         char                    *rmsg = NULL;
 476         char                    *rmatch = NULL;
 477         int                     free_rmsg = 0,
 478                                 free_rmatch = 0;
 479
 480         if ( candidate != META_TARGET_NONE ) {
 481                 lsc = &lc->mc_conns[ candidate ];
 482
 483                 rs->sr_err = LDAP_SUCCESS;
 484
 485                 ldap_get_option( lsc->msc_ld, LDAP_OPT_ERROR_NUMBER, &rs->sr_err );
 486                 if ( rs->sr_err != LDAP_SUCCESS ) {
 487                         /*
 488                          * better check the type of error. In some cases
 489                          * (search ?) it might be better to return a
 490                          * success if at least one of the targets gave
 491                          * positive result ...
 492                          */
 493                         ldap_get_option( lsc->msc_ld,
 494                                         LDAP_OPT_ERROR_STRING, &rmsg );
 495                         ldap_get_option( lsc->msc_ld,
 496                                         LDAP_OPT_MATCHED_DN, &rmatch );
 497                         rerr = rs->sr_err = slap_map_api2result( rs );
 498
 499                         if ( rmsg ) {
 500                                 free_rmsg = 1;
 501                         }
 502                         if ( rmatch ) {
 503                                 free_rmatch = 1;
 504                         }
 505
 506                         Debug(LDAP_DEBUG_ANY,
 507                                         "==> meta_back_op_result: target"
 508                                         " <%d> sending msg \"%s\""
 509                                         " (matched \"%s\")\n",
 510                                         candidate, ( rmsg ? rmsg : "" ),
 511                                         ( rmatch ? rmatch : "" ) );
 512                 }
 513
 514         } else {
 515                 for ( i = 0, lsc = lc->mc_conns; !META_LAST( lsc ); ++i, ++lsc ) {
 516                         char    *msg = NULL;
 517                         char    *match = NULL;
 518
 519                         rs->sr_err = LDAP_SUCCESS;
 520
 521                         ldap_get_option( lsc->msc_ld, LDAP_OPT_ERROR_NUMBER, &rs->sr_err );
 522                         if ( rs->sr_err != LDAP_SUCCESS ) {
 523                                 /*
 524                                  * better check the type of error. In some cases
 525                                  * (search ?) it might be better to return a
 526                                  * success if at least one of the targets gave
 527                                  * positive result ...
 528                                  */
 529                                 ldap_get_option( lsc->msc_ld,
 530                                                 LDAP_OPT_ERROR_STRING, &msg );
 531                                 ldap_get_option( lsc->msc_ld,
 532                                                 LDAP_OPT_MATCHED_DN, &match );
 533                                 rs->sr_err = slap_map_api2result( rs );
 534
 535                                 Debug(LDAP_DEBUG_ANY,
 536                                                 "==> meta_back_op_result: target"
 537                                                 " <%d> sending msg \"%s\""
 538                                                 " (matched \"%s\")\n",
 539                                                 i, ( msg ? msg : "" ),
 540                                                 ( match ? match : "" ) );
 541
 542                                 /*
 543                                  * FIXME: need to rewrite "match" (need rwinfo)
 544                                  */
 545                                 switch ( rs->sr_err ) {
 546                                 default:
 547                                         rerr = rs->sr_err;
 548                                         if ( rmsg ) {
 549                                                 ber_memfree( rmsg );
 550                                         }
 551                                         rmsg = msg;
 552                                         free_rmsg = 1;
 553                                         msg = NULL;
 554                                         if ( rmatch ) {
 555                                                 ber_memfree( rmatch );
 556                                         }
 557                                         rmatch = match;
 558                                         free_rmatch = 1;
 559                                         match = NULL;
 560                                         break;
 561                                 }
 562
 563                                 /* better test the pointers before freeing? */
 564                                 if ( match ) {
 565                                         free( match );
 566                                 }
 567                                 if ( msg ) {
 568                                         free( msg );
 569                                 }
 570                         }
 571                 }
 572         }
 573
 574         rs->sr_err = rerr;
 575         rs->sr_text = rmsg;
 576         rs->sr_matched = rmatch;
 577         send_ldap_result( op, rs );
 578         if ( free_rmsg ) {
 579                 ber_memfree( rmsg );
 580         }
 581         if ( free_rmatch ) {
 582                 ber_memfree( rmatch );
 583         }
 584         rs->sr_text = NULL;
 585         rs->sr_matched = NULL;
 586
 587         return ( ( rerr == LDAP_SUCCESS ) ? 0 : -1 );
 588 }
 589