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 = -1, i, gotit = 0, ndnlen, isroot = 0;
  53         int op_type = META_OP_ALLOW_MULTIPLE;
  54
  55         rs->sr_err = LDAP_SUCCESS;
  56
  57         Debug( LDAP_DEBUG_ARGS, "meta_back_bind: dn: %s.\n%s%s",
  58                         op->o_req_dn.bv_val, "", "" );
  59
  60         if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
  61                 isroot = 1;
  62                 ber_dupbv( &op->orb_edn, be_root_dn( op->o_bd ) );
  63                 op_type = META_OP_REQUIRE_ALL;
  64         }
  65         lc = meta_back_getconn( op, rs, op_type,
  66                         &op->o_req_ndn, NULL );
  67         if ( !lc ) {
  68                 Debug( LDAP_DEBUG_ANY,
  69                                 "meta_back_bind: no target for dn %s.\n%s%s",
  70                                 op->o_req_dn.bv_val, "", "");
  71
  72                 send_ldap_result( op, rs );
  73                 return -1;
  74         }
  75
  76         /*
  77          * Each target is scanned ...
  78          */
  79         lc->mc_bound_target = META_BOUND_NONE;
  80         ndnlen = op->o_req_ndn.bv_len;
  81         for ( i = 0; i < li->ntargets; i++ ) {
  82                 int             lerr;
  83                 struct berval   orig_dn = op->o_req_dn;
  84                 struct berval   orig_ndn = op->o_req_ndn;
  85                 struct berval   orig_cred = op->orb_cred;
  86                 int             orig_method = op->orb_method;
  87
  88
  89                 /*
  90                  * Skip non-candidates
  91                  */
  92                 if ( lc->mc_conns[ i ].msc_candidate != META_CANDIDATE ) {
  93                         continue;
  94                 }
  95
  96                 if ( gotit == 0 ) {
  97                         gotit = 1;
  98                 } else {
  99                         /*
 100                          * A bind operation is expected to have
 101                          * ONE CANDIDATE ONLY!
 102                          */
 103                         Debug( LDAP_DEBUG_ANY,
 104                                         "==>meta_back_bind: more than one"
 105                                         " candidate is attempting to bind"
 106                                         " ...\n%s%s%s",
 107                                         "", "", "" );
 108                 }
 109
 110                 if ( isroot && li->targets[ i ]->mt_pseudorootdn.bv_val != NULL ) {
 111                         op->o_req_dn = li->targets[ i ]->mt_pseudorootdn;
 112                         op->o_req_ndn = li->targets[ i ]->mt_pseudorootdn;
 113                         op->orb_cred = li->targets[ i ]->mt_pseudorootpw;
 114                         op->orb_method = LDAP_AUTH_SIMPLE;
 115                 }
 116
 117                 lerr = meta_back_do_single_bind( lc, op, rs, i );
 118                 if ( lerr != LDAP_SUCCESS ) {
 119                         rs->sr_err = lerr;
 120                         ( void )meta_clear_one_candidate( &lc->mc_conns[ i ], 1 );
 121
 122                 } else {
 123                         rc = LDAP_SUCCESS;
 124                 }
 125
 126                 op->o_req_dn = orig_dn;
 127                 op->o_req_ndn = orig_ndn;
 128                 op->orb_cred = orig_cred;
 129                 op->orb_method = orig_method;
 130         }
 131
 132         if ( isroot ) {
 133                 lc->mc_bound_target = META_BOUND_ALL;
 134         }
 135
 136         /*
 137          * rc is LDAP_SUCCESS if at least one bind succeeded,
 138          * err is the last error that occurred during a bind;
 139          * if at least (and at most?) one bind succeedes, fine.
 140          */
 141         if ( rc != LDAP_SUCCESS /* && rs->sr_err != LDAP_SUCCESS */ ) {
 142
 143                 /*
 144                  * deal with bind failure ...
 145                  */
 146
 147                 /*
 148                  * no target was found within the naming context,
 149                  * so bind must fail with invalid credentials
 150                  */
 151                 if ( rs->sr_err == LDAP_SUCCESS && gotit == 0 ) {
 152                         rs->sr_err = LDAP_INVALID_CREDENTIALS;
 153                 }
 154
 155                 rs->sr_err = slap_map_api2result( rs );
 156                 send_ldap_result( op, rs );
 157                 return -1;
 158         }
 159
 160         return 0;
 161 }
 162
 163 /*
 164  * meta_back_do_single_bind
 165  *
 166  * attempts to perform a bind with creds
 167  */
 168 static int
 169 meta_back_do_single_bind(
 170                 struct metaconn         *lc,
 171                 Operation               *op,
 172                 SlapReply               *rs,
 173                 int                     candidate
 174 )
 175 {
 176         struct metainfo         *li = ( struct metainfo * )op->o_bd->be_private;
 177         struct berval           mdn = BER_BVNULL;
 178         dncookie                dc;
 179         struct metasingleconn   *lsc = &lc->mc_conns[ candidate ];
 180         int                     msgid;
 181
 182         /*
 183          * Rewrite the bind dn if needed
 184          */
 185         dc.rwmap = &li->targets[ candidate ]->mt_rwmap;
 186         dc.conn = op->o_conn;
 187         dc.rs = rs;
 188         dc.ctx = "bindDN";
 189
 190         if ( ldap_back_dn_massage( &dc, &op->o_req_dn, &mdn ) ) {
 191                 send_ldap_result( op, rs );
 192                 return -1;
 193         }
 194
 195         if ( op->o_ctrls ) {
 196                 rs->sr_err = ldap_set_option( lsc->msc_ld,
 197                                 LDAP_OPT_SERVER_CONTROLS, op->o_ctrls );
 198                 if ( rs->sr_err != LDAP_SUCCESS ) {
 199                         rs->sr_err = slap_map_api2result( rs );
 200                         goto return_results;
 201                 }
 202         }
 203
 204         /* FIXME: this fixes the bind problem right now; we need
 205          * to use the asynchronous version to get the "matched"
 206          * and more in case of failure ... */
 207         rs->sr_err = ldap_sasl_bind( lsc->msc_ld, mdn.bv_val,
 208                         LDAP_SASL_SIMPLE, &op->orb_cred,
 209                         op->o_ctrls, NULL, &msgid );
 210         if ( rs->sr_err == LDAP_SUCCESS ) {
 211                 LDAPMessage     *res;
 212                 struct timeval  tv = { 0, 0 };
 213                 int             rc;
 214                 int             nretries = 0;
 215
 216                 /*
 217                  * handle response!!!
 218                  */
 219 retry:;
 220                 switch ( ldap_result( lsc->msc_ld, msgid, 0, &tv, &res ) ) {
 221                 case 0:
 222                         if ( ++nretries <= META_BIND_NRETRIES ) {
 223                                 ldap_pvt_thread_yield();
 224                                 tv.tv_sec = 0;
 225                                 tv.tv_usec = META_BIND_TIMEOUT;
 226                                 goto retry;
 227                         }
 228                         rs->sr_err = LDAP_BUSY;
 229                         break;
 230
 231                 case -1:
 232                         ldap_get_option( lsc->msc_ld, LDAP_OPT_ERROR_NUMBER,
 233                                         &rs->sr_err );
 234                         break;
 235
 236                 default:
 237                         rc = ldap_parse_result( lsc->msc_ld, res, &rs->sr_err,
 238                                         NULL, NULL, NULL, NULL, 1 );
 239                         if ( rc != LDAP_SUCCESS ) {
 240                                 rs->sr_err = rc;
 241                         }
 242                         break;
 243                 }
 244         }
 245
 246         if ( rs->sr_err != LDAP_SUCCESS ) {
 247                 rs->sr_err = slap_map_api2result( rs );
 248                 goto return_results;
 249         }
 250
 251         if ( !BER_BVISNULL( &lsc->msc_bound_ndn ) ) {
 252                 ber_memfree( lsc->msc_bound_ndn.bv_val );
 253         }
 254         ber_dupbv( &lsc->msc_bound_ndn, &op->o_req_dn );
 255         lsc->msc_bound = META_BOUND;
 256         lc->mc_bound_target = candidate;
 257
 258         if ( li->savecred ) {
 259                 if ( !BER_BVISNULL( &lsc->msc_cred ) ) {
 260                         /* destroy sensitive data */
 261                         memset( lsc->msc_cred.bv_val, 0, lsc->msc_cred.bv_len );
 262                         ber_memfree( lsc->msc_cred.bv_val );
 263                 }
 264                 ber_dupbv( &lsc->msc_cred, &op->orb_cred );
 265                 ldap_set_rebind_proc( lsc->msc_ld, meta_back_rebind, lsc );
 266         }
 267
 268         if ( li->cache.ttl != META_DNCACHE_DISABLED
 269                         && op->o_req_ndn.bv_len != 0 ) {
 270                 ( void )meta_dncache_update_entry( &li->cache,
 271                                 &op->o_req_ndn, candidate );
 272         }
 273
 274 return_results:;
 275
 276         if ( mdn.bv_val != op->o_req_dn.bv_val ) {
 277                 free( mdn.bv_val );
 278         }
 279
 280         return rs->sr_err;
 281 }
 282
 283 /*
 284  * meta_back_dobind
 285  */
 286 int
 287 meta_back_dobind( struct metaconn *lc, Operation *op )
 288 {
 289         struct metasingleconn   *lsc;
 290         int                     bound = 0, i;
 291
 292         /*
 293          * all the targets are bound as pseudoroot
 294          */
 295         if ( lc->mc_bound_target == META_BOUND_ALL ) {
 296                 return 1;
 297         }
 298
 299         for ( i = 0, lsc = lc->mc_conns; !META_LAST( lsc ); ++i, ++lsc ) {
 300                 int             rc;
 301                 struct berval   cred = BER_BVC("");
 302                 int             msgid;
 303
 304                 /*
 305                  * Not a candidate or something wrong with this target ...
 306                  */
 307                 if ( lsc->msc_ld == NULL ) {
 308                         continue;
 309                 }
 310
 311                 /*
 312                  * If required, set controls
 313                  */
 314                 if ( op->o_ctrls ) {
 315                         if ( ldap_set_option( lsc->msc_ld, LDAP_OPT_SERVER_CONTROLS,
 316                                         op->o_ctrls ) != LDAP_SUCCESS ) {
 317                                 ( void )meta_clear_one_candidate( lsc, 1 );
 318                                 continue;
 319                         }
 320                 }
 321
 322                 /*
 323                  * If the target is already bound it is skipped
 324                  */
 325                 if ( lsc->msc_bound == META_BOUND && lc->mc_bound_target == i ) {
 326                         ++bound;
 327                         continue;
 328                 }
 329
 330                 /*
 331                  * Otherwise an anonymous bind is performed
 332                  * (note: if the target was already bound, the anonymous
 333                  * bind clears the previous bind).
 334                  */
 335                 if ( !BER_BVISNULL( &lsc->msc_bound_ndn ) ) {
 336                         ber_memfree( lsc->msc_bound_ndn.bv_val );
 337                         BER_BVZERO( &lsc->msc_bound_ndn );
 338                 }
 339
 340                 if ( /* FIXME: need li ... li->savecred && */
 341                                 !BER_BVISNULL( &lsc->msc_cred ) )
 342                 {
 343                         /* destroy sensitive data */
 344                         memset( lsc->msc_cred.bv_val, 0, lsc->msc_cred.bv_len );
 345                         ber_memfree( lsc->msc_cred.bv_val );
 346                         BER_BVZERO( &lsc->msc_cred );
 347                 }
 348
 349                 rc = ldap_sasl_bind( lsc->msc_ld, "", LDAP_SASL_SIMPLE, &cred,
 350                                 op->o_ctrls, NULL, &msgid );
 351                 if ( rc == LDAP_SUCCESS ) {
 352                         LDAPMessage     *res;
 353                         struct timeval  tv = { 0, 0 };
 354                         int             err;
 355                         int             nretries = 0;
 356
 357                         /*
 358                          * handle response!!!
 359                          */
 360 retry:;
 361                         switch ( ldap_result( lsc->msc_ld, msgid, 0, &tv, &res ) ) {
 362                         case 0:
 363                                 if ( ++nretries <= META_BIND_NRETRIES ) {
 364                                         ldap_pvt_thread_yield();
 365                                         tv.tv_sec = 0;
 366                                         tv.tv_usec = META_BIND_TIMEOUT;
 367                                         goto retry;
 368                                 }
 369
 370                                 rc = LDAP_BUSY;
 371                                 break;
 372
 373                         case -1:
 374                                 ldap_get_option( lsc->msc_ld, LDAP_OPT_ERROR_NUMBER,
 375                                                 &rc );
 376                                 break;
 377
 378                         default:
 379                                 rc = ldap_parse_result( lsc->msc_ld, res, &err,
 380                                                 NULL, NULL, NULL, NULL, 1 );
 381                                 if ( rc == LDAP_SUCCESS ) {
 382                                         rc = err;
 383                                 }
 384                                 break;
 385                         }
 386                 }
 387
 388                 if ( rc != LDAP_SUCCESS ) {
 389                         Debug( LDAP_DEBUG_ANY,
 390                                         "==>meta_back_dobind: (anonymous)"
 391                                         " bind failed"
 392                                         " with error %d (%s)\n",
 393                                         rc, ldap_err2string( rc ), 0 );
 394
 395                         /*
 396                          * null cred bind should always succeed
 397                          * as anonymous, so a failure means
 398                          * the target is no longer candidate possibly
 399                          * due to technical reasons (remote host down?)
 400                          * so better clear the handle
 401                          */
 402                         ( void )meta_clear_one_candidate( lsc, 1 );
 403                         continue;
 404                 } /* else */
 405
 406                 lsc->msc_bound = META_ANONYMOUS;
 407                 ++bound;
 408         }
 409
 410         return( bound > 0 );
 411 }
 412
 413 /*
 414  *
 415  */
 416 int
 417 meta_back_is_valid( struct metaconn *lc, int candidate )
 418 {
 419         struct metasingleconn   *lsc;
 420         int                     i;
 421
 422         assert( lc );
 423
 424         if ( candidate < 0 ) {
 425                 return 0;
 426         }
 427
 428         for ( i = 0, lsc = lc->mc_conns; !META_LAST( lsc ) && i < candidate;
 429                         ++i, ++lsc );
 430
 431         if ( !META_LAST( lsc ) ) {
 432                 return ( lsc->msc_ld != NULL );
 433         }
 434
 435         return 0;
 436 }
 437
 438 /*
 439  * meta_back_rebind
 440  *
 441  * This is a callback used for chasing referrals using the same
 442  * credentials as the original user on this session.
 443  */
 444 static int
 445 meta_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 446         ber_int_t msgid, void *params )
 447 {
 448         struct metasingleconn   *lsc = params;
 449
 450         return ldap_sasl_bind_s( ld, lsc->msc_bound_ndn.bv_val,
 451                         LDAP_SASL_SIMPLE, &lsc->msc_cred,
 452                         NULL, NULL, NULL );
 453 }
 454
 455 /*
 456  * FIXME: error return must be handled in a cleaner way ...
 457  */
 458 int
 459 meta_back_op_result( struct metaconn *lc, Operation *op, SlapReply *rs )
 460 {
 461         int                     i,
 462                                 rerr = LDAP_SUCCESS;
 463         struct metasingleconn   *lsc;
 464         char                    *rmsg = NULL;
 465         char                    *rmatch = NULL;
 466         int                     free_rmsg = 0,
 467                                 free_rmatch = 0;
 468
 469         for ( i = 0, lsc = lc->mc_conns; !META_LAST( lsc ); ++i, ++lsc ) {
 470                 char    *msg = NULL;
 471                 char    *match = NULL;
 472
 473                 rs->sr_err = LDAP_SUCCESS;
 474
 475                 ldap_get_option( lsc->msc_ld, LDAP_OPT_ERROR_NUMBER, &rs->sr_err );
 476                 if ( rs->sr_err != LDAP_SUCCESS ) {
 477                         /*
 478                          * better check the type of error. In some cases
 479                          * (search ?) it might be better to return a
 480                          * success if at least one of the targets gave
 481                          * positive result ...
 482                          */
 483                         ldap_get_option( lsc->msc_ld,
 484                                         LDAP_OPT_ERROR_STRING, &msg );
 485                         ldap_get_option( lsc->msc_ld,
 486                                         LDAP_OPT_MATCHED_DN, &match );
 487                         rs->sr_err = slap_map_api2result( rs );
 488
 489                         Debug(LDAP_DEBUG_ANY,
 490                                         "==> meta_back_op_result: target"
 491                                         " <%d> sending msg \"%s\""
 492                                         " (matched \"%s\")\n",
 493                                         i, ( msg ? msg : "" ),
 494                                         ( match ? match : "" ) );
 495
 496                         /*
 497                          * FIXME: need to rewrite "match" (need rwinfo)
 498                          */
 499                         switch ( rs->sr_err ) {
 500                         default:
 501                                 rerr = rs->sr_err;
 502                                 if ( rmsg ) {
 503                                         ber_memfree( rmsg );
 504                                 }
 505                                 rmsg = msg;
 506                                 free_rmsg = 1;
 507                                 msg = NULL;
 508                                 if ( rmatch ) {
 509                                         ber_memfree( rmatch );
 510                                 }
 511                                 rmatch = match;
 512                                 free_rmatch = 1;
 513                                 match = NULL;
 514                                 break;
 515                         }
 516
 517                         /* better test the pointers before freeing? */
 518                         if ( match ) {
 519                                 free( match );
 520                         }
 521                         if ( msg ) {
 522                                 free( msg );
 523                         }
 524                 }
 525         }
 526
 527         rs->sr_err = rerr;
 528         rs->sr_text = rmsg;
 529         rs->sr_matched = rmatch;
 530         send_ldap_result( op, rs );
 531         if ( free_rmsg ) {
 532                 ber_memfree( rmsg );
 533         }
 534         if ( free_rmatch ) {
 535                 ber_memfree( rmatch );
 536         }
 537         rs->sr_text = NULL;
 538         rs->sr_matched = NULL;
 539
 540         return ( ( rerr == LDAP_SUCCESS ) ? 0 : -1 );
 541 }
 542