git.sur5r.net Git - openldap/blob - servers/slapd/back-ldap/search.c

   1 /* search.c - ldap backend search function */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 1999-2009 The OpenLDAP Foundation.
   6  * Portions Copyright 1999-2003 Howard Chu.
   7  * Portions Copyright 2000-2003 Pierangelo Masarati.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted only as authorized by the OpenLDAP
  12  * Public License.
  13  *
  14  * A copy of this license is available in the file LICENSE in the
  15  * top-level directory of the distribution or, alternatively, at
  16  * <http://www.OpenLDAP.org/license.html>.
  17  */
  18 /* ACKNOWLEDGEMENTS:
  19  * This work was initially developed by the Howard Chu for inclusion
  20  * in OpenLDAP Software and subsequently enhanced by Pierangelo
  21  * Masarati.
  22  */
  23
  24 #include "portable.h"
  25
  26 #include <stdio.h>
  27
  28 #include <ac/socket.h>
  29 #include <ac/string.h>
  30 #include <ac/time.h>
  31
  32 #include "slap.h"
  33 #include "back-ldap.h"
  34 #undef ldap_debug       /* silence a warning in ldap-int.h */
  35 #include "../../../libraries/libldap/ldap-int.h"
  36
  37 #include "lutil.h"
  38
  39 static int
  40 ldap_build_entry( Operation *op, LDAPMessage *e, Entry *ent,
  41          struct berval *bdn );
  42
  43 /*
  44  * Quick'n'dirty rewrite of filter in case of error, to deal with
  45  * <draft-zeilenga-ldap-t-f>.
  46  */
  47 static int
  48 ldap_back_munge_filter(
  49         Operation       *op,
  50         struct berval   *filter )
  51 {
  52         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
  53
  54         char            *ptr;
  55         int             gotit = 0;
  56
  57         Debug( LDAP_DEBUG_ARGS, "=> ldap_back_munge_filter \"%s\"\n",
  58                         filter->bv_val, 0, 0 );
  59
  60         for ( ptr = strstr( filter->bv_val, "(?=" );
  61                         ptr;
  62                         ptr = strstr( ptr, "(?=" ) )
  63         {
  64                 static struct berval
  65                         bv_true = BER_BVC( "(?=true)" ),
  66                         bv_false = BER_BVC( "(?=false)" ),
  67                         bv_undefined = BER_BVC( "(?=undefined)" ),
  68                         bv_t = BER_BVC( "(&)" ),
  69                         bv_f = BER_BVC( "(|)" ),
  70                         bv_T = BER_BVC( "(objectClass=*)" ),
  71                         bv_F = BER_BVC( "(!(objectClass=*))" );
  72                 struct berval   *oldbv = NULL,
  73                                 *newbv = NULL,
  74                                 oldfilter = BER_BVNULL;
  75
  76                 if ( strncmp( ptr, bv_true.bv_val, bv_true.bv_len ) == 0 ) {
  77                         oldbv = &bv_true;
  78                         if ( LDAP_BACK_T_F( li ) ) {
  79                                 newbv = &bv_t;
  80
  81                         } else {
  82                                 newbv = &bv_T;
  83                         }
  84
  85                 } else if ( strncmp( ptr, bv_false.bv_val, bv_false.bv_len ) == 0 )
  86                 {
  87                         oldbv = &bv_false;
  88                         if ( LDAP_BACK_T_F( li ) ) {
  89                                 newbv = &bv_f;
  90
  91                         } else {
  92                                 newbv = &bv_F;
  93                         }
  94
  95                 } else if ( strncmp( ptr, bv_undefined.bv_val, bv_undefined.bv_len ) == 0 )
  96                 {
  97                         /* if undef or invalid filter is not allowed,
  98                          * don't rewrite filter */
  99                         if ( LDAP_BACK_NOUNDEFFILTER( li ) ) {
 100                                 if ( filter->bv_val != op->ors_filterstr.bv_val ) {
 101                                         op->o_tmpfree( filter->bv_val, op->o_tmpmemctx );
 102                                 }
 103                                 BER_BVZERO( filter );
 104                                 gotit = -1;
 105                                 goto done;
 106                         }
 107
 108                         oldbv = &bv_undefined;
 109                         newbv = &bv_F;
 110
 111                 } else {
 112                         gotit = 0;
 113                         goto done;
 114                 }
 115
 116                 oldfilter = *filter;
 117                 filter->bv_len += newbv->bv_len - oldbv->bv_len;
 118                 if ( filter->bv_val == op->ors_filterstr.bv_val ) {
 119                         filter->bv_val = op->o_tmpalloc( filter->bv_len + 1,
 120                                         op->o_tmpmemctx );
 121
 122                         AC_MEMCPY( filter->bv_val, op->ors_filterstr.bv_val,
 123                                         op->ors_filterstr.bv_len + 1 );
 124
 125                 } else {
 126                         filter->bv_val = op->o_tmprealloc( filter->bv_val,
 127                                         filter->bv_len + 1, op->o_tmpmemctx );
 128                 }
 129
 130                 ptr = filter->bv_val + ( ptr - oldfilter.bv_val );
 131
 132                 AC_MEMCPY( &ptr[ newbv->bv_len ],
 133                                 &ptr[ oldbv->bv_len ],
 134                                 oldfilter.bv_len - ( ptr - filter->bv_val ) - oldbv->bv_len + 1 );
 135                 AC_MEMCPY( ptr, newbv->bv_val, newbv->bv_len );
 136
 137                 ptr += newbv->bv_len;
 138                 gotit = 1;
 139         }
 140
 141 done:;
 142         Debug( LDAP_DEBUG_ARGS, "<= ldap_back_munge_filter \"%s\" (%d)\n",
 143                         filter->bv_val, gotit, 0 );
 144
 145         return gotit;
 146 }
 147
 148 int
 149 ldap_back_search(
 150                 Operation       *op,
 151                 SlapReply       *rs )
 152 {
 153         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 154
 155         ldapconn_t      *lc = NULL;
 156         struct timeval  tv;
 157         time_t          stoptime = (time_t)(-1);
 158         LDAPMessage     *res,
 159                         *e;
 160         int             rc = 0,
 161                         msgid;
 162         struct berval   match = BER_BVNULL,
 163                         filter = BER_BVNULL;
 164         int             i;
 165         char            **attrs = NULL;
 166         int             freetext = 0;
 167         int             do_retry = 1, dont_retry = 0;
 168         LDAPControl     **ctrls = NULL;
 169         char            **references = NULL;
 170
 171         /* FIXME: shouldn't this be null? */
 172         const char      *save_matched = rs->sr_matched;
 173
 174         if ( !ldap_back_dobind( &lc, op, rs, LDAP_BACK_SENDERR ) ) {
 175                 return rs->sr_err;
 176         }
 177
 178         /*
 179          * FIXME: in case of values return filter, we might want
 180          * to map attrs and maybe rewrite value
 181          */
 182
 183         if ( op->ors_tlimit != SLAP_NO_LIMIT ) {
 184                 tv.tv_sec = op->ors_tlimit;
 185                 tv.tv_usec = 0;
 186                 stoptime = op->o_time + op->ors_tlimit;
 187
 188         } else {
 189                 LDAP_BACK_TV_SET( &tv );
 190         }
 191
 192         if ( op->ors_attrs ) {
 193                 for ( i = 0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++ )
 194                         /* just count attrs */ ;
 195
 196                 attrs = ch_malloc( ( i + 1 )*sizeof( char * ) );
 197                 if ( attrs == NULL ) {
 198                         rs->sr_err = LDAP_NO_MEMORY;
 199                         rc = -1;
 200                         goto finish;
 201                 }
 202
 203                 for ( i = 0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++ ) {
 204                         attrs[ i ] = op->ors_attrs[i].an_name.bv_val;
 205                 }
 206                 attrs[ i ] = NULL;
 207         }
 208
 209         ctrls = op->o_ctrls;
 210         rc = ldap_back_controls_add( op, rs, lc, &ctrls );
 211         if ( rc != LDAP_SUCCESS ) {
 212                 goto finish;
 213         }
 214
 215         /* deal with <draft-zeilenga-ldap-t-f> filters */
 216         filter = op->ors_filterstr;
 217 retry:
 218         rs->sr_err = ldap_pvt_search( lc->lc_ld, op->o_req_dn.bv_val,
 219                         op->ors_scope, filter.bv_val,
 220                         attrs, op->ors_attrsonly, ctrls, NULL,
 221                         tv.tv_sec ? &tv : NULL,
 222                         op->ors_slimit, op->ors_deref, &msgid );
 223
 224         if ( rs->sr_err != LDAP_SUCCESS ) {
 225                 switch ( rs->sr_err ) {
 226                 case LDAP_SERVER_DOWN:
 227                         if ( do_retry ) {
 228                                 do_retry = 0;
 229                                 if ( ldap_back_retry( &lc, op, rs, LDAP_BACK_DONTSEND ) ) {
 230                                         goto retry;
 231                                 }
 232                         }
 233
 234                         if ( lc == NULL ) {
 235                                 /* reset by ldap_back_retry ... */
 236                                 rs->sr_err = slap_map_api2result( rs );
 237
 238                         } else {
 239                                 rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_DONTSEND );
 240                         }
 241
 242                         goto finish;
 243
 244                 case LDAP_FILTER_ERROR:
 245                         if (ldap_back_munge_filter( op, &filter ) > 0 ) {
 246                                 goto retry;
 247                         }
 248
 249                         /* invalid filters return success with no data */
 250                         rs->sr_err = LDAP_SUCCESS;
 251                         rs->sr_text = NULL;
 252                         goto finish;
 253
 254                 default:
 255                         rs->sr_err = slap_map_api2result( rs );
 256                         rs->sr_text = NULL;
 257                         goto finish;
 258                 }
 259         }
 260
 261         /* if needed, initialize timeout */
 262         if ( li->li_timeout[ SLAP_OP_SEARCH ] ) {
 263                 if ( tv.tv_sec == 0 || tv.tv_sec > li->li_timeout[ SLAP_OP_SEARCH ] ) {
 264                         tv.tv_sec = li->li_timeout[ SLAP_OP_SEARCH ];
 265                         tv.tv_usec = 0;
 266                 }
 267         }
 268
 269         /* We pull apart the ber result, stuff it into a slapd entry, and
 270          * let send_search_entry stuff it back into ber format. Slow & ugly,
 271          * but this is necessary for version matching, and for ACL processing.
 272          */
 273
 274         for ( rc = -2; rc != -1; rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ONE, &tv, &res ) )
 275         {
 276                 /* check for abandon */
 277                 if ( op->o_abandon || LDAP_BACK_CONN_ABANDON( lc ) ) {
 278                         if ( rc > 0 ) {
 279                                 ldap_msgfree( res );
 280                         }
 281                         (void)ldap_back_cancel( lc, op, rs, msgid, LDAP_BACK_DONTSEND );
 282                         rc = SLAPD_ABANDON;
 283                         goto finish;
 284                 }
 285
 286                 if ( rc == 0 || rc == -2 ) {
 287                         ldap_pvt_thread_yield();
 288
 289                         /* check timeout */
 290                         if ( li->li_timeout[ SLAP_OP_SEARCH ] ) {
 291                                 if ( rc == 0 ) {
 292                                         (void)ldap_back_cancel( lc, op, rs, msgid, LDAP_BACK_DONTSEND );
 293                                         rs->sr_text = "Operation timed out";
 294                                         rc = rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
 295                                                 LDAP_ADMINLIMIT_EXCEEDED : LDAP_OTHER;
 296                                         goto finish;
 297                                 }
 298
 299                         } else {
 300                                 LDAP_BACK_TV_SET( &tv );
 301                         }
 302
 303                         /* check time limit */
 304                         if ( op->ors_tlimit != SLAP_NO_LIMIT
 305                                         && slap_get_time() > stoptime )
 306                         {
 307                                 (void)ldap_back_cancel( lc, op, rs, msgid, LDAP_BACK_DONTSEND );
 308                                 rc = rs->sr_err = LDAP_TIMELIMIT_EXCEEDED;
 309                                 goto finish;
 310                         }
 311                         continue;
 312
 313                 } else {
 314                         /* only touch when activity actually took place... */
 315                         if ( li->li_idle_timeout && lc ) {
 316                                 lc->lc_time = op->o_time;
 317                         }
 318
 319                         /* don't retry any more */
 320                         dont_retry = 1;
 321                 }
 322
 323
 324                 if ( rc == LDAP_RES_SEARCH_ENTRY ) {
 325                         Entry           ent = { 0 };
 326                         struct berval   bdn = BER_BVNULL;
 327
 328                         do_retry = 0;
 329
 330                         e = ldap_first_entry( lc->lc_ld, res );
 331                         rc = ldap_build_entry( op, e, &ent, &bdn );
 332                         if ( rc == LDAP_SUCCESS ) {
 333                                 ldap_get_entry_controls( lc->lc_ld, res, &rs->sr_ctrls );
 334                                 rs->sr_entry = &ent;
 335                                 rs->sr_attrs = op->ors_attrs;
 336                                 rs->sr_operational_attrs = NULL;
 337                                 rs->sr_flags = 0;
 338                                 rs->sr_err = LDAP_SUCCESS;
 339                                 rc = rs->sr_err = send_search_entry( op, rs );
 340                                 if ( rs->sr_ctrls ) {
 341                                         ldap_controls_free( rs->sr_ctrls );
 342                                         rs->sr_ctrls = NULL;
 343                                 }
 344                                 rs->sr_entry = NULL;
 345                                 if ( !BER_BVISNULL( &ent.e_name ) ) {
 346                                         assert( ent.e_name.bv_val != bdn.bv_val );
 347                                         op->o_tmpfree( ent.e_name.bv_val, op->o_tmpmemctx );
 348                                         BER_BVZERO( &ent.e_name );
 349                                 }
 350                                 if ( !BER_BVISNULL( &ent.e_nname ) ) {
 351                                         op->o_tmpfree( ent.e_nname.bv_val, op->o_tmpmemctx );
 352                                         BER_BVZERO( &ent.e_nname );
 353                                 }
 354                                 entry_clean( &ent );
 355                         }
 356                         ldap_msgfree( res );
 357                         switch ( rc ) {
 358                         case LDAP_SUCCESS:
 359                         case LDAP_INSUFFICIENT_ACCESS:
 360                                 break;
 361
 362                         default:
 363                                 if ( rc == LDAP_UNAVAILABLE ) {
 364                                         rc = rs->sr_err = LDAP_OTHER;
 365                                 } else {
 366                                         (void)ldap_back_cancel( lc, op, rs, msgid, LDAP_BACK_DONTSEND );
 367                                 }
 368                                 goto finish;
 369                         }
 370
 371                 } else if ( rc == LDAP_RES_SEARCH_REFERENCE ) {
 372                         if ( LDAP_BACK_NOREFS( li ) ) {
 373                                 ldap_msgfree( res );
 374                                 continue;
 375                         }
 376
 377                         do_retry = 0;
 378                         rc = ldap_parse_reference( lc->lc_ld, res,
 379                                         &references, &rs->sr_ctrls, 1 );
 380
 381                         if ( rc != LDAP_SUCCESS ) {
 382                                 continue;
 383                         }
 384
 385                         /* FIXME: there MUST be at least one */
 386                         if ( references && references[ 0 ] && references[ 0 ][ 0 ] ) {
 387                                 int             cnt;
 388
 389                                 for ( cnt = 0; references[ cnt ]; cnt++ )
 390                                         /* NO OP */ ;
 391
 392                                 /* FIXME: there MUST be at least one */
 393                                 rs->sr_ref = op->o_tmpalloc( ( cnt + 1 ) * sizeof( struct berval ),
 394                                         op->o_tmpmemctx );
 395
 396                                 for ( cnt = 0; references[ cnt ]; cnt++ ) {
 397                                         ber_str2bv( references[ cnt ], 0, 0, &rs->sr_ref[ cnt ] );
 398                                 }
 399                                 BER_BVZERO( &rs->sr_ref[ cnt ] );
 400
 401                                 /* ignore return value by now */
 402                                 rs->sr_entry = NULL;
 403                                 ( void )send_search_reference( op, rs );
 404
 405                         } else {
 406                                 Debug( LDAP_DEBUG_ANY,
 407                                         "%s ldap_back_search: "
 408                                         "got SEARCH_REFERENCE "
 409                                         "with no referrals\n",
 410                                         op->o_log_prefix, 0, 0 );
 411                         }
 412
 413                         /* cleanup */
 414                         if ( references ) {
 415                                 ber_memvfree( (void **)references );
 416                                 op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
 417                                 rs->sr_ref = NULL;
 418                                 references = NULL;
 419                         }
 420
 421                         if ( rs->sr_ctrls ) {
 422                                 ldap_controls_free( rs->sr_ctrls );
 423                                 rs->sr_ctrls = NULL;
 424                         }
 425
 426                 } else {
 427                         char            *err = NULL;
 428
 429                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 430                                         &match.bv_val, &err,
 431                                         &references, &rs->sr_ctrls, 1 );
 432                         if ( rc != LDAP_SUCCESS ) {
 433                                 rs->sr_err = rc;
 434                         }
 435                         rs->sr_err = slap_map_api2result( rs );
 436                         if ( err ) {
 437                                 rs->sr_text = err;
 438                                 freetext = 1;
 439                         }
 440
 441                         /* RFC 4511: referrals can only appear
 442                          * if result code is LDAP_REFERRAL */
 443                         if ( references
 444                                 && references[ 0 ]
 445                                 && references[ 0 ][ 0 ] )
 446                         {
 447                                 if ( rs->sr_err != LDAP_REFERRAL ) {
 448                                         Debug( LDAP_DEBUG_ANY,
 449                                                 "%s ldap_back_search: "
 450                                                 "got referrals with err=%d\n",
 451                                                 op->o_log_prefix,
 452                                                 rs->sr_err, 0 );
 453
 454                                 } else {
 455                                         int     cnt;
 456
 457                                         for ( cnt = 0; references[ cnt ]; cnt++ )
 458                                                 /* NO OP */ ;
 459
 460                                         rs->sr_ref = op->o_tmpalloc( ( cnt + 1 ) * sizeof( struct berval ),
 461                                                 op->o_tmpmemctx );
 462
 463                                         for ( cnt = 0; references[ cnt ]; cnt++ ) {
 464                                                 /* duplicating ...*/
 465                                                 ber_str2bv( references[ cnt ], 0, 0, &rs->sr_ref[ cnt ] );
 466                                         }
 467                                         BER_BVZERO( &rs->sr_ref[ cnt ] );
 468                                 }
 469
 470                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
 471                                 Debug( LDAP_DEBUG_ANY,
 472                                         "%s ldap_back_search: "
 473                                         "got err=%d with null "
 474                                         "or empty referrals\n",
 475                                         op->o_log_prefix,
 476                                         rs->sr_err, 0 );
 477
 478                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 479                         }
 480
 481                         if ( match.bv_val != NULL ) {
 482                                 match.bv_len = strlen( match.bv_val );
 483                         }
 484
 485                         rc = 0;
 486                         break;
 487                 }
 488
 489                 /* if needed, restore timeout */
 490                 if ( li->li_timeout[ SLAP_OP_SEARCH ] ) {
 491                         if ( tv.tv_sec == 0 || tv.tv_sec > li->li_timeout[ SLAP_OP_SEARCH ] ) {
 492                                 tv.tv_sec = li->li_timeout[ SLAP_OP_SEARCH ];
 493                                 tv.tv_usec = 0;
 494                         }
 495                 }
 496         }
 497
 498         if ( rc == -1 && dont_retry == 0 ) {
 499                 if ( do_retry ) {
 500                         do_retry = 0;
 501                         if ( ldap_back_retry( &lc, op, rs, LDAP_BACK_DONTSEND ) ) {
 502                                 goto retry;
 503                         }
 504                 }
 505                 rs->sr_err = LDAP_SERVER_DOWN;
 506                 rs->sr_err = slap_map_api2result( rs );
 507                 goto finish;
 508         }
 509
 510         /*
 511          * Rewrite the matched portion of the search base, if required
 512          */
 513         if ( !BER_BVISNULL( &match ) && !BER_BVISEMPTY( &match ) ) {
 514                 struct berval   pmatch;
 515
 516                 if ( dnPretty( NULL, &match, &pmatch, op->o_tmpmemctx ) == LDAP_SUCCESS ) {
 517                         rs->sr_matched = pmatch.bv_val;
 518                         LDAP_FREE( match.bv_val );
 519
 520                 } else {
 521                         rs->sr_matched = match.bv_val;
 522                 }
 523         }
 524
 525         if ( rs->sr_v2ref ) {
 526                 rs->sr_err = LDAP_REFERRAL;
 527         }
 528
 529 finish:;
 530         if ( LDAP_BACK_QUARANTINE( li ) ) {
 531                 ldap_back_quarantine( op, rs );
 532         }
 533
 534         if ( filter.bv_val != op->ors_filterstr.bv_val ) {
 535                 op->o_tmpfree( filter.bv_val, op->o_tmpmemctx );
 536         }
 537
 538 #if 0
 539         /* let send_ldap_result play cleanup handlers (ITS#4645) */
 540         if ( rc != SLAPD_ABANDON )
 541 #endif
 542         {
 543                 send_ldap_result( op, rs );
 544         }
 545
 546         (void)ldap_back_controls_free( op, rs, &ctrls );
 547
 548         if ( rs->sr_ctrls ) {
 549                 ldap_controls_free( rs->sr_ctrls );
 550                 rs->sr_ctrls = NULL;
 551         }
 552
 553         if ( rs->sr_matched != NULL && rs->sr_matched != save_matched ) {
 554                 if ( rs->sr_matched != match.bv_val ) {
 555                         ber_memfree_x( (char *)rs->sr_matched, op->o_tmpmemctx );
 556
 557                 } else {
 558                         LDAP_FREE( match.bv_val );
 559                 }
 560                 rs->sr_matched = save_matched;
 561         }
 562
 563         if ( rs->sr_text ) {
 564                 if ( freetext ) {
 565                         LDAP_FREE( (char *)rs->sr_text );
 566                 }
 567                 rs->sr_text = NULL;
 568         }
 569
 570         if ( rs->sr_ref ) {
 571                 op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
 572                 rs->sr_ref = NULL;
 573         }
 574
 575         if ( references ) {
 576                 ber_memvfree( (void **)references );
 577         }
 578
 579         if ( attrs ) {
 580                 ch_free( attrs );
 581         }
 582
 583         if ( lc != NULL ) {
 584                 ldap_back_release_conn( li, lc );
 585         }
 586
 587         return rs->sr_err;
 588 }
 589
 590 static int
 591 ldap_build_entry(
 592                 Operation       *op,
 593                 LDAPMessage     *e,
 594                 Entry           *ent,
 595                 struct berval   *bdn )
 596 {
 597         struct berval   a;
 598         BerElement      ber = *e->lm_ber;
 599         Attribute       *attr, **attrp;
 600         const char      *text;
 601         int             last;
 602         char *lastb;
 603         ber_len_t len;
 604
 605         /* safe assumptions ... */
 606         assert( ent != NULL );
 607         BER_BVZERO( &ent->e_bv );
 608
 609         if ( ber_scanf( &ber, "{m", bdn ) == LBER_ERROR ) {
 610                 return LDAP_DECODING_ERROR;
 611         }
 612
 613         /*
 614          * Note: this may fail if the target host(s) schema differs
 615          * from the one known to the meta, and a DN with unknown
 616          * attributes is returned.
 617          *
 618          * FIXME: should we log anything, or delegate to dnNormalize?
 619          */
 620         /* Note: if the distinguished values or the naming attributes
 621          * change, should we massage them as well?
 622          */
 623         if ( dnPrettyNormal( NULL, bdn, &ent->e_name, &ent->e_nname,
 624                 op->o_tmpmemctx ) != LDAP_SUCCESS )
 625         {
 626                 return LDAP_INVALID_DN_SYNTAX;
 627         }
 628
 629         ent->e_attrs = NULL;
 630         if ( ber_first_element( &ber, &len, &lastb ) != LBER_SEQUENCE ) {
 631                 return LDAP_SUCCESS;
 632         }
 633
 634         attrp = &ent->e_attrs;
 635         while ( ber_next_element( &ber, &len, lastb ) == LBER_SEQUENCE &&
 636                 ber_scanf( &ber, "{m", &a ) != LBER_ERROR ) {
 637                 int                             i;
 638                 slap_syntax_validate_func       *validate;
 639                 slap_syntax_transform_func      *pretty;
 640
 641                 attr = attr_alloc( NULL );
 642                 if ( attr == NULL ) {
 643                         continue;
 644                 }
 645                 if ( slap_bv2ad( &a, &attr->a_desc, &text )
 646                                 != LDAP_SUCCESS )
 647                 {
 648                         if ( slap_bv2undef_ad( &a, &attr->a_desc, &text,
 649                                 SLAP_AD_PROXIED ) != LDAP_SUCCESS )
 650                         {
 651                                 Debug( LDAP_DEBUG_ANY,
 652                                         "%s ldap_build_entry: "
 653                                         "slap_bv2undef_ad(%s): %s\n",
 654                                         op->o_log_prefix, a.bv_val, text );
 655                                 attr_free( attr );
 656                                 continue;
 657                         }
 658                 }
 659
 660                 /* no subschemaSubentry */
 661                 if ( attr->a_desc == slap_schema.si_ad_subschemaSubentry
 662                         || attr->a_desc == slap_schema.si_ad_entryDN )
 663                 {
 664
 665                         /*
 666                          * We eat target's subschemaSubentry because
 667                          * a search for this value is likely not
 668                          * to resolve to the appropriate backend;
 669                          * later, the local subschemaSubentry is
 670                          * added.
 671                          *
 672                          * We also eat entryDN because the frontend
 673                          * will reattach it without checking if already
 674                          * present...
 675                          */
 676                         ( void )ber_scanf( &ber, "x" /* [W] */ );
 677
 678                         attr_free( attr );
 679                         continue;
 680                 }
 681
 682                 if ( ber_scanf( &ber, "[W]", &attr->a_vals ) == LBER_ERROR
 683                                 || attr->a_vals == NULL )
 684                 {
 685                         /*
 686                          * Note: attr->a_vals can be null when using
 687                          * values result filter
 688                          */
 689                         attr->a_vals = (struct berval *)&slap_dummy_bv;
 690                 }
 691
 692                 validate = attr->a_desc->ad_type->sat_syntax->ssyn_validate;
 693                 pretty = attr->a_desc->ad_type->sat_syntax->ssyn_pretty;
 694
 695                 if ( !validate && !pretty ) {
 696                         attr->a_nvals = NULL;
 697                         attr_free( attr );
 698                         goto next_attr;
 699                 }
 700
 701                 for ( i = 0; !BER_BVISNULL( &attr->a_vals[i] ); i++ ) {
 702                         struct berval   pval;
 703                         int             rc;
 704
 705                         if ( pretty ) {
 706                                 rc = pretty( attr->a_desc->ad_type->sat_syntax,
 707                                         &attr->a_vals[i], &pval, NULL );
 708
 709                         } else {
 710                                 rc = validate( attr->a_desc->ad_type->sat_syntax,
 711                                         &attr->a_vals[i] );
 712                         }
 713
 714                         if ( rc != LDAP_SUCCESS ) {
 715                                 ObjectClass *oc;
 716
 717                                 /* check if, by chance, it's an undefined objectClass */
 718                                 if ( attr->a_desc == slap_schema.si_ad_objectClass &&
 719                                                 ( oc = oc_bvfind_undef( &attr->a_vals[i] ) ) != NULL )
 720                                 {
 721                                         ber_dupbv( &pval, &oc->soc_cname );
 722
 723                                 } else {
 724                                         attr->a_nvals = NULL;
 725                                         attr_free( attr );
 726                                         goto next_attr;
 727                                 }
 728                         }
 729
 730                         if ( pretty ) {
 731                                 LBER_FREE( attr->a_vals[i].bv_val );
 732                                 attr->a_vals[i] = pval;
 733                         }
 734                 }
 735                 attr->a_numvals = last = i;
 736
 737                 if ( last && attr->a_desc->ad_type->sat_equality &&
 738                                 attr->a_desc->ad_type->sat_equality->smr_normalize )
 739                 {
 740                         attr->a_nvals = ch_malloc( ( last + 1 )*sizeof( struct berval ) );
 741                         for ( i = 0; i < last; i++ ) {
 742                                 int             rc;
 743
 744                                 /*
 745                                  * check that each value is valid per syntax
 746                                  * and pretty if appropriate
 747                                  */
 748                                 rc = attr->a_desc->ad_type->sat_equality->smr_normalize(
 749                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
 750                                         attr->a_desc->ad_type->sat_syntax,
 751                                         attr->a_desc->ad_type->sat_equality,
 752                                         &attr->a_vals[i], &attr->a_nvals[i],
 753                                         NULL );
 754
 755                                 if ( rc != LDAP_SUCCESS ) {
 756                                         BER_BVZERO( &attr->a_nvals[i] );
 757                                         attr_free( attr );
 758                                         goto next_attr;
 759                                 }
 760                         }
 761                         BER_BVZERO( &attr->a_nvals[i] );
 762
 763                 } else {
 764                         attr->a_nvals = attr->a_vals;
 765                 }
 766                 *attrp = attr;
 767                 attrp = &attr->a_next;
 768
 769 next_attr:;
 770         }
 771
 772         return LDAP_SUCCESS;
 773 }
 774
 775 /* return 0 IFF we can retrieve the entry with ndn
 776  */
 777 int
 778 ldap_back_entry_get(
 779                 Operation               *op,
 780                 struct berval           *ndn,
 781                 ObjectClass             *oc,
 782                 AttributeDescription    *at,
 783                 int                     rw,
 784                 Entry                   **ent )
 785 {
 786         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 787
 788         ldapconn_t      *lc = NULL;
 789         int             rc,
 790                         do_not_cache;
 791         ber_tag_t       tag;
 792         struct berval   bdn;
 793         LDAPMessage     *result = NULL,
 794                         *e = NULL;
 795         char            *attr[3], **attrp = NULL;
 796         char            *filter = NULL;
 797         SlapReply       rs;
 798         int             do_retry = 1;
 799         LDAPControl     **ctrls = NULL;
 800
 801         *ent = NULL;
 802
 803         /* Tell getconn this is a privileged op */
 804         do_not_cache = op->o_do_not_cache;
 805         tag = op->o_tag;
 806         /* do not cache */
 807         op->o_do_not_cache = 1;
 808         /* ldap_back_entry_get() is an entry lookup, so it does not need
 809          * to know what the entry is being looked up for */
 810         op->o_tag = LDAP_REQ_SEARCH;
 811         rc = ldap_back_dobind( &lc, op, &rs, LDAP_BACK_DONTSEND );
 812         op->o_do_not_cache = do_not_cache;
 813         op->o_tag = tag;
 814         if ( !rc ) {
 815                 return rs.sr_err;
 816         }
 817
 818         if ( at ) {
 819                 attrp = attr;
 820                 if ( oc && at != slap_schema.si_ad_objectClass ) {
 821                         attr[0] = slap_schema.si_ad_objectClass->ad_cname.bv_val;
 822                         attr[1] = at->ad_cname.bv_val;
 823                         attr[2] = NULL;
 824
 825                 } else {
 826                         attr[0] = at->ad_cname.bv_val;
 827                         attr[1] = NULL;
 828                 }
 829         }
 830
 831         if ( oc ) {
 832                 char    *ptr;
 833
 834                 filter = op->o_tmpalloc( STRLENOF( "(objectClass=" ")" )
 835                                 + oc->soc_cname.bv_len + 1, op->o_tmpmemctx );
 836                 ptr = lutil_strcopy( filter, "(objectClass=" );
 837                 ptr = lutil_strcopy( ptr, oc->soc_cname.bv_val );
 838                 *ptr++ = ')';
 839                 *ptr++ = '\0';
 840         }
 841
 842 retry:
 843         ctrls = op->o_ctrls;
 844         rc = ldap_back_controls_add( op, &rs, lc, &ctrls );
 845         if ( rc != LDAP_SUCCESS ) {
 846                 goto cleanup;
 847         }
 848
 849         /* TODO: timeout? */
 850         rc = ldap_pvt_search_s( lc->lc_ld, ndn->bv_val, LDAP_SCOPE_BASE, filter,
 851                                 attrp, 0, ctrls, NULL,
 852                                 NULL, LDAP_NO_LIMIT, op->ors_deref, &result );
 853         if ( rc != LDAP_SUCCESS ) {
 854                 if ( rc == LDAP_SERVER_DOWN && do_retry ) {
 855                         do_retry = 0;
 856                         if ( ldap_back_retry( &lc, op, &rs, LDAP_BACK_DONTSEND ) ) {
 857                                 /* if the identity changed, there might be need to re-authz */
 858                                 (void)ldap_back_controls_free( op, &rs, &ctrls );
 859                                 goto retry;
 860                         }
 861                 }
 862                 goto cleanup;
 863         }
 864
 865         e = ldap_first_entry( lc->lc_ld, result );
 866         if ( e == NULL ) {
 867                 /* the entry exists, but it doesn't match the filter? */
 868                 goto cleanup;
 869         }
 870
 871         *ent = entry_alloc();
 872         if ( *ent == NULL ) {
 873                 rc = LDAP_NO_MEMORY;
 874                 goto cleanup;
 875         }
 876
 877         rc = ldap_build_entry( op, e, *ent, &bdn );
 878
 879         if ( rc != LDAP_SUCCESS ) {
 880                 entry_free( *ent );
 881                 *ent = NULL;
 882         }
 883
 884 cleanup:
 885         (void)ldap_back_controls_free( op, &rs, &ctrls );
 886
 887         if ( result ) {
 888                 ldap_msgfree( result );
 889         }
 890
 891         if ( filter ) {
 892                 op->o_tmpfree( filter, op->o_tmpmemctx );
 893         }
 894
 895         if ( lc != NULL ) {
 896                 ldap_back_release_conn( li, lc );
 897         }
 898
 899         return rc;
 900 }
 901