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         /* FIXME: this fixes the bind problem right now; we need
 196          * to use the asynchronous version to get the "matched"
 197          * and more in case of failure ... */
 198         /* FIXME: should be check if at least some of the op->o_ctrls
 199          * can/should be passed? */
 200         rs->sr_err = ldap_sasl_bind( lsc->msc_ld, mdn.bv_val,
 201                         LDAP_SASL_SIMPLE, &op->orb_cred,
 202                         op->o_ctrls, NULL, &msgid );
 203         if ( rs->sr_err == LDAP_SUCCESS ) {
 204                 LDAPMessage     *res;
 205                 struct timeval  tv = { 0, 0 };
 206                 int             rc;
 207                 int             nretries = 0;
 208
 209                 /*
 210                  * handle response!!!
 211                  */
 212 retry:;
 213                 switch ( ldap_result( lsc->msc_ld, msgid, 0, &tv, &res ) ) {
 214                 case 0:
 215                         if ( ++nretries <= META_BIND_NRETRIES ) {
 216                                 ldap_pvt_thread_yield();
 217                                 tv.tv_sec = 0;
 218                                 tv.tv_usec = META_BIND_TIMEOUT;
 219                                 goto retry;
 220                         }
 221                         rs->sr_err = LDAP_BUSY;
 222                         break;
 223
 224                 case -1:
 225                         ldap_get_option( lsc->msc_ld, LDAP_OPT_ERROR_NUMBER,
 226                                         &rs->sr_err );
 227                         break;
 228
 229                 default:
 230                         rc = ldap_parse_result( lsc->msc_ld, res, &rs->sr_err,
 231                                         NULL, NULL, NULL, NULL, 1 );
 232                         if ( rc != LDAP_SUCCESS ) {
 233                                 rs->sr_err = rc;
 234                         }
 235                         break;
 236                 }
 237         }
 238
 239         if ( rs->sr_err != LDAP_SUCCESS ) {
 240                 rs->sr_err = slap_map_api2result( rs );
 241                 goto return_results;
 242         }
 243
 244         if ( !BER_BVISNULL( &lsc->msc_bound_ndn ) ) {
 245                 ber_memfree( lsc->msc_bound_ndn.bv_val );
 246         }
 247         ber_dupbv( &lsc->msc_bound_ndn, &op->o_req_dn );
 248         lsc->msc_bound = META_BOUND;
 249         lc->mc_bound_target = candidate;
 250
 251         if ( li->flags & LDAP_BACK_F_SAVECRED ) {
 252                 if ( !BER_BVISNULL( &lsc->msc_cred ) ) {
 253                         /* destroy sensitive data */
 254                         memset( lsc->msc_cred.bv_val, 0, lsc->msc_cred.bv_len );
 255                         ber_memfree( lsc->msc_cred.bv_val );
 256                 }
 257                 ber_dupbv( &lsc->msc_cred, &op->orb_cred );
 258                 ldap_set_rebind_proc( lsc->msc_ld, meta_back_rebind, lsc );
 259         }
 260
 261         if ( li->cache.ttl != META_DNCACHE_DISABLED
 262                         && op->o_req_ndn.bv_len != 0 ) {
 263                 ( void )meta_dncache_update_entry( &li->cache,
 264                                 &op->o_req_ndn, candidate );
 265         }
 266
 267 return_results:;
 268
 269         if ( mdn.bv_val != op->o_req_dn.bv_val ) {
 270                 free( mdn.bv_val );
 271         }
 272
 273         return rs->sr_err;
 274 }
 275
 276 /*
 277  * meta_back_dobind
 278  */
 279 int
 280 meta_back_dobind( struct metaconn *lc, Operation *op )
 281 {
 282         struct metasingleconn   *lsc;
 283         int                     bound = 0, i;
 284
 285         /*
 286          * all the targets are bound as pseudoroot
 287          */
 288         if ( lc->mc_bound_target == META_BOUND_ALL ) {
 289                 return 1;
 290         }
 291
 292         for ( i = 0, lsc = lc->mc_conns; !META_LAST( lsc ); ++i, ++lsc ) {
 293                 int             rc;
 294                 struct berval   cred = BER_BVC("");
 295                 int             msgid;
 296
 297                 /*
 298                  * Not a candidate or something wrong with this target ...
 299                  */
 300                 if ( lsc->msc_ld == NULL ) {
 301                         continue;
 302                 }
 303
 304                 /*
 305                  * If the target is already bound it is skipped
 306                  */
 307                 if ( lsc->msc_bound == META_BOUND && lc->mc_bound_target == i ) {
 308                         ++bound;
 309                         continue;
 310                 }
 311
 312                 /*
 313                  * Otherwise an anonymous bind is performed
 314                  * (note: if the target was already bound, the anonymous
 315                  * bind clears the previous bind).
 316                  */
 317                 if ( !BER_BVISNULL( &lsc->msc_bound_ndn ) ) {
 318                         ber_memfree( lsc->msc_bound_ndn.bv_val );
 319                         BER_BVZERO( &lsc->msc_bound_ndn );
 320                 }
 321
 322                 if ( /* FIXME: need li ... li->savecred && */
 323                                 !BER_BVISNULL( &lsc->msc_cred ) )
 324                 {
 325                         /* destroy sensitive data */
 326                         memset( lsc->msc_cred.bv_val, 0, lsc->msc_cred.bv_len );
 327                         ber_memfree( lsc->msc_cred.bv_val );
 328                         BER_BVZERO( &lsc->msc_cred );
 329                 }
 330
 331                 /* FIXME: should we check if at least some of the op->o_ctrls
 332                  * can/should be passed? */
 333                 rc = ldap_sasl_bind( lsc->msc_ld, "", LDAP_SASL_SIMPLE, &cred,
 334                                 NULL, NULL, &msgid );
 335                 if ( rc == LDAP_SUCCESS ) {
 336                         LDAPMessage     *res;
 337                         struct timeval  tv = { 0, 0 };
 338                         int             err;
 339                         int             nretries = 0;
 340
 341                         /*
 342                          * handle response!!!
 343                          */
 344 retry:;
 345                         switch ( ldap_result( lsc->msc_ld, msgid, 0, &tv, &res ) ) {
 346                         case 0:
 347                                 if ( ++nretries <= META_BIND_NRETRIES ) {
 348                                         ldap_pvt_thread_yield();
 349                                         tv.tv_sec = 0;
 350                                         tv.tv_usec = META_BIND_TIMEOUT;
 351                                         goto retry;
 352                                 }
 353
 354                                 rc = LDAP_BUSY;
 355                                 break;
 356
 357                         case -1:
 358                                 ldap_get_option( lsc->msc_ld, LDAP_OPT_ERROR_NUMBER,
 359                                                 &rc );
 360                                 break;
 361
 362                         default:
 363                                 rc = ldap_parse_result( lsc->msc_ld, res, &err,
 364                                                 NULL, NULL, NULL, NULL, 1 );
 365                                 if ( rc == LDAP_SUCCESS ) {
 366                                         rc = err;
 367                                 }
 368                                 break;
 369                         }
 370                 }
 371
 372                 if ( rc != LDAP_SUCCESS ) {
 373                         Debug( LDAP_DEBUG_ANY,
 374                                         "==>meta_back_dobind: (anonymous)"
 375                                         " bind failed"
 376                                         " with error %d (%s)\n",
 377                                         rc, ldap_err2string( rc ), 0 );
 378
 379                         /*
 380                          * null cred bind should always succeed
 381                          * as anonymous, so a failure means
 382                          * the target is no longer candidate possibly
 383                          * due to technical reasons (remote host down?)
 384                          * so better clear the handle
 385                          */
 386                         ( void )meta_clear_one_candidate( lsc, 1 );
 387                         continue;
 388                 } /* else */
 389
 390                 lsc->msc_bound = META_ANONYMOUS;
 391                 ++bound;
 392         }
 393
 394         return( bound > 0 );
 395 }
 396
 397 /*
 398  *
 399  */
 400 int
 401 meta_back_is_valid( struct metaconn *lc, int candidate )
 402 {
 403         struct metasingleconn   *lsc;
 404         int                     i;
 405
 406         assert( lc );
 407
 408         if ( candidate < 0 ) {
 409                 return 0;
 410         }
 411
 412         for ( i = 0, lsc = lc->mc_conns; !META_LAST( lsc ) && i < candidate;
 413                         ++i, ++lsc );
 414
 415         if ( !META_LAST( lsc ) ) {
 416                 return ( lsc->msc_ld != NULL );
 417         }
 418
 419         return 0;
 420 }
 421
 422 /*
 423  * meta_back_rebind
 424  *
 425  * This is a callback used for chasing referrals using the same
 426  * credentials as the original user on this session.
 427  */
 428 static int
 429 meta_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 430         ber_int_t msgid, void *params )
 431 {
 432         struct metasingleconn   *lsc = params;
 433
 434         return ldap_sasl_bind_s( ld, lsc->msc_bound_ndn.bv_val,
 435                         LDAP_SASL_SIMPLE, &lsc->msc_cred,
 436                         NULL, NULL, NULL );
 437 }
 438
 439 /*
 440  * FIXME: error return must be handled in a cleaner way ...
 441  */
 442 int
 443 meta_back_op_result( struct metaconn *lc, Operation *op, SlapReply *rs )
 444 {
 445         int                     i,
 446                                 rerr = LDAP_SUCCESS;
 447         struct metasingleconn   *lsc;
 448         char                    *rmsg = NULL;
 449         char                    *rmatch = NULL;
 450         int                     free_rmsg = 0,
 451                                 free_rmatch = 0;
 452
 453         for ( i = 0, lsc = lc->mc_conns; !META_LAST( lsc ); ++i, ++lsc ) {
 454                 char    *msg = NULL;
 455                 char    *match = NULL;
 456
 457                 rs->sr_err = LDAP_SUCCESS;
 458
 459                 ldap_get_option( lsc->msc_ld, LDAP_OPT_ERROR_NUMBER, &rs->sr_err );
 460                 if ( rs->sr_err != LDAP_SUCCESS ) {
 461                         /*
 462                          * better check the type of error. In some cases
 463                          * (search ?) it might be better to return a
 464                          * success if at least one of the targets gave
 465                          * positive result ...
 466                          */
 467                         ldap_get_option( lsc->msc_ld,
 468                                         LDAP_OPT_ERROR_STRING, &msg );
 469                         ldap_get_option( lsc->msc_ld,
 470                                         LDAP_OPT_MATCHED_DN, &match );
 471                         rs->sr_err = slap_map_api2result( rs );
 472
 473                         Debug(LDAP_DEBUG_ANY,
 474                                         "==> meta_back_op_result: target"
 475                                         " <%d> sending msg \"%s\""
 476                                         " (matched \"%s\")\n",
 477                                         i, ( msg ? msg : "" ),
 478                                         ( match ? match : "" ) );
 479
 480                         /*
 481                          * FIXME: need to rewrite "match" (need rwinfo)
 482                          */
 483                         switch ( rs->sr_err ) {
 484                         default:
 485                                 rerr = rs->sr_err;
 486                                 if ( rmsg ) {
 487                                         ber_memfree( rmsg );
 488                                 }
 489                                 rmsg = msg;
 490                                 free_rmsg = 1;
 491                                 msg = NULL;
 492                                 if ( rmatch ) {
 493                                         ber_memfree( rmatch );
 494                                 }
 495                                 rmatch = match;
 496                                 free_rmatch = 1;
 497                                 match = NULL;
 498                                 break;
 499                         }
 500
 501                         /* better test the pointers before freeing? */
 502                         if ( match ) {
 503                                 free( match );
 504                         }
 505                         if ( msg ) {
 506                                 free( msg );
 507                         }
 508                 }
 509         }
 510
 511         rs->sr_err = rerr;
 512         rs->sr_text = rmsg;
 513         rs->sr_matched = rmatch;
 514         send_ldap_result( op, rs );
 515         if ( free_rmsg ) {
 516                 ber_memfree( rmsg );
 517         }
 518         if ( free_rmatch ) {
 519                 ber_memfree( rmatch );
 520         }
 521         rs->sr_text = NULL;
 522         rs->sr_matched = NULL;
 523
 524         return ( ( rerr == LDAP_SUCCESS ) ? 0 : -1 );
 525 }
 526