git.sur5r.net Git - openldap/blob - servers/slapd/backend.c

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6 /* backend.c - routines for dealing with back-end databases */
   7
   8
   9 #include "portable.h"
  10
  11 #include <stdio.h>
  12
  13 #include <ac/string.h>
  14 #include <ac/socket.h>
  15
  16 #include <sys/stat.h>
  17
  18 #include "slap.h"
  19 #include "lutil.h"
  20
  21 #ifdef SLAPD_DNSSRV
  22 #include "back-dnssrv/external.h"
  23 #endif
  24 #ifdef SLAPD_LDAP
  25 #include "back-ldap/external.h"
  26 #endif
  27 #ifdef SLAPD_LDBM
  28 #include "back-ldbm/external.h"
  29 #endif
  30 #ifdef SLAPD_PASSWD
  31 #include "back-passwd/external.h"
  32 #endif
  33 #ifdef SLAPD_PERL
  34 #include "back-perl/external.h"
  35 #endif
  36 #ifdef SLAPD_SHELL
  37 #include "back-shell/external.h"
  38 #endif
  39 #ifdef SLAPD_TCL
  40 #include "back-tcl/external.h"
  41 #endif
  42 #ifdef SLAPD_SQL
  43 #include "back-sql/external.h"
  44 #endif
  45 #ifdef SLAPD_PRIVATE
  46 #include "private/external.h"
  47 #endif
  48
  49 static BackendInfo binfo[] = {
  50 #if defined(SLAPD_DNSSRV) && !defined(SLAPD_DNSSRV_DYNAMIC)
  51         {"dnssrv",      dnssrv_back_initialize},
  52 #endif
  53 #if defined(SLAPD_LDAP) && !defined(SLAPD_LDAP_DYNAMIC)
  54         {"ldap",        ldap_back_initialize},
  55 #endif
  56 #if defined(SLAPD_LDBM) && !defined(SLAPD_LDBM_DYNAMIC)
  57         {"ldbm",        ldbm_back_initialize},
  58 #endif
  59 #if defined(SLAPD_PASSWD) && !defined(SLAPD_PASSWD_DYNAMIC)
  60         {"passwd",      passwd_back_initialize},
  61 #endif
  62 #if defined(SLAPD_PERL) && !defined(SLAPD_PERL_DYNAMIC)
  63         {"perl",        perl_back_initialize},
  64 #endif
  65 #if defined(SLAPD_SHELL) && !defined(SLAPD_SHELL_DYNAMIC)
  66         {"shell",       shell_back_initialize},
  67 #endif
  68 #if defined(SLAPD_TCL) && !defined(SLAPD_TCL_DYNAMIC)
  69         {"tcl",         tcl_back_initialize},
  70 #endif
  71 #if defined(SLAPD_SQL) && !defined(SLAPD_SQL_DYNAMIC)
  72         {"sql",         sql_back_initialize},
  73 #endif
  74         /* for any private backend */
  75 #if defined(SLAPD_PRIVATE) && !defined(SLAPD_PRIVATE_DYNAMIC)
  76         {"private",     private_back_initialize},
  77 #endif
  78         {NULL}
  79 };
  80
  81 int                     nBackendInfo = 0;
  82 BackendInfo     *backendInfo = NULL;
  83
  84 int                     nBackendDB = 0;
  85 BackendDB       *backendDB = NULL;
  86
  87 int backend_init(void)
  88 {
  89         int rc = -1;
  90
  91         if((nBackendInfo != 0) || (backendInfo != NULL)) {
  92                 /* already initialized */
  93                 Debug( LDAP_DEBUG_ANY,
  94                         "backend_init: already initialized.\n", 0, 0, 0 );
  95                 return -1;
  96         }
  97
  98         for( ;
  99                 binfo[nBackendInfo].bi_type != NULL;
 100                 nBackendInfo++ )
 101         {
 102                 rc = binfo[nBackendInfo].bi_init( &binfo[nBackendInfo] );
 103
 104                 if(rc != 0) {
 105                         Debug( LDAP_DEBUG_ANY,
 106                                 "backend_init: initialized for type \"%s\"\n",
 107                                         binfo[nBackendInfo].bi_type, 0, 0 );
 108
 109                         /* destroy those we've already inited */
 110                         for( nBackendInfo--;
 111                                 nBackendInfo >= 0 ;
 112                                 nBackendInfo-- )
 113                         {
 114                                 if ( binfo[nBackendInfo].bi_destroy ) {
 115                                         binfo[nBackendInfo].bi_destroy(
 116                                                 &binfo[nBackendInfo] );
 117                                 }
 118                         }
 119                         return rc;
 120                 }
 121         }
 122
 123         if ( nBackendInfo > 0) {
 124                 backendInfo = binfo;
 125                 return 0;
 126         }
 127
 128 #ifdef SLAPD_MODULES
 129         return 0;
 130 #else
 131         Debug( LDAP_DEBUG_ANY,
 132                 "backend_init: failed\n",
 133                 0, 0, 0 );
 134
 135         return rc;
 136 #endif /* SLAPD_MODULES */
 137 }
 138
 139 int backend_add(BackendInfo *aBackendInfo)
 140 {
 141    int rc = 0;
 142
 143    if ((rc = aBackendInfo->bi_init(aBackendInfo)) != 0) {
 144       Debug( LDAP_DEBUG_ANY,
 145              "backend_add: initialization for type \"%s\" failed\n",
 146              aBackendInfo->bi_type, 0, 0 );
 147       return rc;
 148    }
 149
 150    /* now add the backend type to the Backend Info List */
 151    {
 152       BackendInfo *newBackendInfo = 0;
 153
 154       /* if backendInfo == binfo no deallocation of old backendInfo */
 155       if (backendInfo == binfo) {
 156          newBackendInfo = ch_calloc(nBackendInfo + 1, sizeof(BackendInfo));
 157          AC_MEMCPY(newBackendInfo, backendInfo, sizeof(BackendInfo) *
 158                 nBackendInfo);
 159       } else {
 160          newBackendInfo = ch_realloc(backendInfo, sizeof(BackendInfo) *
 161                                      (nBackendInfo + 1));
 162       }
 163       AC_MEMCPY(&newBackendInfo[nBackendInfo], aBackendInfo,
 164              sizeof(BackendInfo));
 165       backendInfo = newBackendInfo;
 166       nBackendInfo++;
 167
 168       return 0;
 169    }
 170 }
 171
 172 int backend_startup(Backend *be)
 173 {
 174         int i;
 175         int rc = 0;
 176
 177         if( ! ( nBackendDB > 0 ) ) {
 178                 /* no databases */
 179                 Debug( LDAP_DEBUG_ANY,
 180                         "backend_startup: %d databases to startup.\n",
 181                         nBackendDB, 0, 0 );
 182                 return 1;
 183         }
 184
 185         if(be != NULL) {
 186                 /* startup a specific backend database */
 187                 Debug( LDAP_DEBUG_TRACE,
 188                         "backend_startup: starting database\n",
 189                         0, 0, 0 );
 190
 191                 if ( be->bd_info->bi_open ) {
 192                         rc = be->bd_info->bi_open( be->bd_info );
 193                 }
 194
 195                 if(rc != 0) {
 196                         Debug( LDAP_DEBUG_ANY,
 197                                 "backend_startup: bi_open failed!\n",
 198                                 0, 0, 0 );
 199                         return rc;
 200                 }
 201
 202                 if ( be->bd_info->bi_db_open ) {
 203                         rc = be->bd_info->bi_db_open( be );
 204                 }
 205
 206                 if(rc != 0) {
 207                         Debug( LDAP_DEBUG_ANY,
 208                                 "backend_startup: bi_db_open failed!\n",
 209                                 0, 0, 0 );
 210                         return rc;
 211                 }
 212
 213                 return rc;
 214         }
 215
 216         /* open each backend type */
 217         for( i = 0; i < nBackendInfo; i++ ) {
 218                 if( backendInfo[i].bi_nDB == 0) {
 219                         /* no database of this type, don't open */
 220                         continue;
 221                 }
 222
 223                 if( backendInfo[i].bi_open ) {
 224                         rc = backendInfo[i].bi_open(
 225                                 &backendInfo[i] );
 226                 }
 227
 228                 if(rc != 0) {
 229                         Debug( LDAP_DEBUG_ANY,
 230                                 "backend_startup: bi_open %d failed!\n",
 231                                 i, 0, 0 );
 232                         return rc;
 233                 }
 234         }
 235
 236         /* open each backend database */
 237         for( i = 0; i < nBackendDB; i++ ) {
 238                 /* append global access controls */
 239                 acl_append( &backendDB[i].be_acl, global_acl );
 240
 241                 if ( backendDB[i].bd_info->bi_db_open ) {
 242                         rc = backendDB[i].bd_info->bi_db_open(
 243                                 &backendDB[i] );
 244                 }
 245
 246                 if(rc != 0) {
 247                         Debug( LDAP_DEBUG_ANY,
 248                                 "backend_startup: bi_db_open %d failed!\n",
 249                                 i, 0, 0 );
 250                         return rc;
 251                 }
 252         }
 253
 254         return rc;
 255 }
 256
 257 int backend_num( Backend *be )
 258 {
 259         int i;
 260
 261         if( be == NULL ) return -1;
 262
 263         for( i = 0; i < nBackendDB; i++ ) {
 264                 if( be == &backendDB[i] ) return i;
 265         }
 266         return -1;
 267 }
 268
 269 int backend_shutdown( Backend *be )
 270 {
 271         int i;
 272         int rc = 0;
 273
 274         if( be != NULL ) {
 275                 /* shutdown a specific backend database */
 276
 277                 if ( be->bd_info->bi_nDB == 0 ) {
 278                         /* no database of this type, we never opened it */
 279                         return 0;
 280                 }
 281
 282                 if ( be->bd_info->bi_db_close ) {
 283                         be->bd_info->bi_db_close( be );
 284                 }
 285
 286                 if( be->bd_info->bi_close ) {
 287                         be->bd_info->bi_close( be->bd_info );
 288                 }
 289
 290                 return 0;
 291         }
 292
 293         /* close each backend database */
 294         for( i = 0; i < nBackendDB; i++ ) {
 295                 if ( backendDB[i].bd_info->bi_db_close ) {
 296                         backendDB[i].bd_info->bi_db_close(
 297                                 &backendDB[i] );
 298                 }
 299
 300                 if(rc != 0) {
 301                         Debug( LDAP_DEBUG_ANY,
 302                                 "backend_close: bi_close %s failed!\n",
 303                                 backendDB[i].be_type, 0, 0 );
 304                 }
 305         }
 306
 307         /* close each backend type */
 308         for( i = 0; i < nBackendInfo; i++ ) {
 309                 if( backendInfo[i].bi_nDB == 0 ) {
 310                         /* no database of this type */
 311                         continue;
 312                 }
 313
 314                 if( backendInfo[i].bi_close ) {
 315                         backendInfo[i].bi_close(
 316                                 &backendInfo[i] );
 317                 }
 318         }
 319
 320         return 0;
 321 }
 322
 323 int backend_destroy(void)
 324 {
 325         int i;
 326
 327         /* destroy each backend database */
 328         for( i = 0; i < nBackendDB; i++ ) {
 329                 if ( backendDB[i].bd_info->bi_db_destroy ) {
 330                         backendDB[i].bd_info->bi_db_destroy(
 331                                 &backendDB[i] );
 332                 }
 333         }
 334
 335         /* destroy each backend type */
 336         for( i = 0; i < nBackendInfo; i++ ) {
 337                 if( backendInfo[i].bi_destroy ) {
 338                         backendInfo[i].bi_destroy(
 339                                 &backendInfo[i] );
 340                 }
 341         }
 342
 343 #ifdef SLAPD_MODULES
 344         if (backendInfo != binfo) {
 345            free(backendInfo);
 346         }
 347 #endif /* SLAPD_MODULES */
 348
 349         nBackendInfo = 0;
 350         backendInfo = NULL;
 351
 352         return 0;
 353 }
 354
 355 BackendInfo* backend_info(const char *type)
 356 {
 357         int i;
 358
 359         /* search for the backend type */
 360         for( i = 0; i < nBackendInfo; i++ ) {
 361                 if( strcasecmp(backendInfo[i].bi_type, type) == 0 ) {
 362                         return &backendInfo[i];
 363                 }
 364         }
 365
 366         return NULL;
 367 }
 368
 369
 370 BackendDB *
 371 backend_db_init(
 372     const char  *type
 373 )
 374 {
 375         Backend *be;
 376         BackendInfo *bi = backend_info(type);
 377         int     rc = 0;
 378
 379         if( bi == NULL ) {
 380                 fprintf( stderr, "Unrecognized database type (%s)\n", type );
 381                 return NULL;
 382         }
 383
 384         backendDB = (BackendDB *) ch_realloc(
 385                         (char *) backendDB,
 386                     (nBackendDB + 1) * sizeof(Backend) );
 387
 388         memset( &backendDB[nbackends], '\0', sizeof(Backend) );
 389
 390         be = &backends[nbackends++];
 391
 392         be->bd_info = bi;
 393         be->be_sizelimit = defsize;
 394         be->be_timelimit = deftime;
 395         be->be_dfltaccess = global_default_access;
 396
 397         be->be_restrictops = global_restrictops;
 398         be->be_requires = global_requires;
 399
 400         /* assign a default depth limit for alias deref */
 401         be->be_max_deref_depth = SLAPD_DEFAULT_MAXDEREFDEPTH;
 402
 403         if(bi->bi_db_init) {
 404                 rc = bi->bi_db_init( be );
 405         }
 406
 407         if(rc != 0) {
 408                 fprintf( stderr, "database init failed (%s)\n", type );
 409                 nbackends--;
 410                 return NULL;
 411         }
 412
 413         bi->bi_nDB++;
 414         return( be );
 415 }
 416
 417 void
 418 be_db_close( void )
 419 {
 420         int     i;
 421
 422         for ( i = 0; i < nbackends; i++ ) {
 423                 if ( backends[i].bd_info->bi_db_close ) {
 424                         (*backends[i].bd_info->bi_db_close)( &backends[i] );
 425                 }
 426         }
 427 }
 428
 429 Backend *
 430 select_backend(
 431         const char * dn,
 432         int manageDSAit )
 433 {
 434         int     i, j, len, dnlen;
 435         Backend *be = NULL;
 436
 437         dnlen = strlen( dn );
 438         for ( i = 0; i < nbackends; i++ ) {
 439                 for ( j = 0; backends[i].be_nsuffix != NULL &&
 440                     backends[i].be_nsuffix[j] != NULL; j++ )
 441                 {
 442                         len = strlen( backends[i].be_nsuffix[j] );
 443
 444                         if ( len > dnlen ) {
 445                                 continue;
 446                         }
 447
 448                         if ( strcmp( backends[i].be_nsuffix[j],
 449                             dn + (dnlen - len) ) == 0 )
 450                         {
 451                                 if( be == NULL ) {
 452                                         be = &backends[i];
 453
 454                                         if( manageDSAit && len == dnlen ) {
 455                                                 continue;
 456                                         }
 457                                 } else {
 458                                         be = &backends[i];
 459                                 }
 460                                 return be;
 461                         }
 462                 }
 463         }
 464
 465         return be;
 466 }
 467
 468 int
 469 be_issuffix(
 470     Backend     *be,
 471     const char  *suffix
 472 )
 473 {
 474         int     i;
 475
 476         for ( i = 0; be->be_nsuffix != NULL && be->be_nsuffix[i] != NULL; i++ ) {
 477                 if ( strcmp( be->be_nsuffix[i], suffix ) == 0 ) {
 478                         return( 1 );
 479                 }
 480         }
 481
 482         return( 0 );
 483 }
 484
 485 int
 486 be_isroot( Backend *be, const char *ndn )
 487 {
 488         int rc;
 489
 490         if ( ndn == NULL || *ndn == '\0' ) {
 491                 return( 0 );
 492         }
 493
 494         if ( be->be_root_ndn == NULL || *be->be_root_ndn == '\0' ) {
 495                 return( 0 );
 496         }
 497
 498         rc = strcmp( be->be_root_ndn, ndn ) ? 0 : 1;
 499
 500         return(rc);
 501 }
 502
 503 char *
 504 be_root_dn( Backend *be )
 505 {
 506         if ( be->be_root_dn == NULL ) {
 507                 return( "" );
 508         }
 509
 510         return be->be_root_dn;
 511 }
 512
 513 int
 514 be_isroot_pw( Backend *be,
 515         Connection *conn,
 516         const char *ndn,
 517         struct berval *cred )
 518 {
 519         int result;
 520
 521         if ( ! be_isroot( be, ndn ) ) {
 522                 return 0;
 523         }
 524
 525         if( be->be_root_pw.bv_len == 0 ) {
 526                 return 0;
 527         }
 528
 529 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 530         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 531 #ifdef SLAPD_SPASSWD
 532         lutil_passwd_sasl_conn = conn->c_sasl_context;
 533 #endif
 534 #endif
 535
 536         result = lutil_passwd( &be->be_root_pw, cred, NULL );
 537
 538 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 539 #ifdef SLAPD_SPASSWD
 540         lutil_passwd_sasl_conn = NULL;
 541 #endif
 542         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 543 #endif
 544
 545         return result == 0;
 546 }
 547
 548 int
 549 be_entry_release_rw( Backend *be, Entry *e, int rw )
 550 {
 551         if ( be->be_release ) {
 552                 /* free and release entry from backend */
 553                 return be->be_release( be, e, rw );
 554         } else {
 555                 /* free entry */
 556                 entry_free( e );
 557                 return 0;
 558         }
 559 }
 560
 561 int
 562 backend_unbind(
 563         Connection   *conn,
 564         Operation    *op
 565 )
 566 {
 567         int     i;
 568
 569         for ( i = 0; i < nbackends; i++ ) {
 570                 if ( backends[i].be_unbind ) {
 571                         (*backends[i].be_unbind)( &backends[i], conn, op );
 572                 }
 573         }
 574
 575         return 0;
 576 }
 577
 578 int
 579 backend_connection_init(
 580         Connection   *conn
 581 )
 582 {
 583         int     i;
 584
 585         for ( i = 0; i < nbackends; i++ ) {
 586                 if ( backends[i].be_connection_init ) {
 587                         (*backends[i].be_connection_init)( &backends[i], conn);
 588                 }
 589         }
 590
 591         return 0;
 592 }
 593
 594 int
 595 backend_connection_destroy(
 596         Connection   *conn
 597 )
 598 {
 599         int     i;
 600
 601         for ( i = 0; i < nbackends; i++ ) {
 602                 if ( backends[i].be_connection_destroy ) {
 603                         (*backends[i].be_connection_destroy)( &backends[i], conn);
 604                 }
 605         }
 606
 607         return 0;
 608 }
 609
 610 static int
 611 backend_check_controls(
 612         Backend *be,
 613         Connection *conn,
 614         Operation *op,
 615         const char **text )
 616 {
 617         LDAPControl **ctrls;
 618         ctrls = op->o_ctrls;
 619         if( ctrls == NULL ) {
 620                 return LDAP_SUCCESS;
 621         }
 622
 623         for( ; *ctrls != NULL ; ctrls++ ) {
 624                 if( (*ctrls)->ldctl_iscritical &&
 625                         !charray_inlist( be->be_controls, (*ctrls)->ldctl_oid ) )
 626                 {
 627                         *text = "control unavailable in NamingContext";
 628                         return LDAP_UNAVAILABLE_CRITICAL_EXTENSION;
 629                 }
 630         }
 631
 632         return LDAP_SUCCESS;
 633 }
 634
 635 int
 636 backend_check_restrictions(
 637         Backend *be,
 638         Connection *conn,
 639         Operation *op,
 640         const char *extoid,
 641         const char **text )
 642 {
 643         int rc;
 644         slap_mask_t restrictops;
 645         slap_mask_t requires;
 646         slap_mask_t opflag;
 647         slap_ssf_set_t *ssf;
 648         int updateop = 0;
 649
 650         if( be ) {
 651                 rc = backend_check_controls( be, conn, op, text );
 652
 653                 if( rc != LDAP_SUCCESS ) {
 654                         return rc;
 655                 }
 656
 657                 restrictops = be->be_restrictops;
 658                 requires = be->be_requires;
 659                 ssf = &be->be_ssf_set;
 660
 661         } else {
 662                 restrictops = global_restrictops;
 663                 requires = global_requires;
 664                 ssf = &global_ssf_set;
 665         }
 666
 667         switch( op->o_tag ) {
 668         case LDAP_REQ_ADD:
 669                 opflag = SLAP_RESTRICT_OP_ADD;
 670                 updateop++;
 671                 break;
 672         case LDAP_REQ_BIND:
 673                 opflag = SLAP_RESTRICT_OP_BIND;
 674                 break;
 675         case LDAP_REQ_COMPARE:
 676                 opflag = SLAP_RESTRICT_OP_COMPARE;
 677                 break;
 678         case LDAP_REQ_DELETE:
 679                 updateop++;
 680                 opflag = SLAP_RESTRICT_OP_DELETE;
 681                 break;
 682         case LDAP_REQ_EXTENDED:
 683                 opflag = SLAP_RESTRICT_OP_EXTENDED;
 684                 break;
 685         case LDAP_REQ_MODIFY:
 686                 updateop++;
 687                 opflag = SLAP_RESTRICT_OP_MODIFY;
 688                 break;
 689         case LDAP_REQ_RENAME:
 690                 updateop++;
 691                 opflag = SLAP_RESTRICT_OP_RENAME;
 692                 break;
 693         case LDAP_REQ_SEARCH:
 694                 opflag = SLAP_RESTRICT_OP_SEARCH;
 695                 break;
 696         case LDAP_REQ_UNBIND:
 697                 opflag = 0;
 698                 break;
 699         default:
 700                 *text = "restrict operations internal error";
 701                 return LDAP_OTHER;
 702         }
 703
 704         if (( extoid == NULL || strcmp( extoid, LDAP_EXOP_START_TLS ) ) ) {
 705                 /* these checks don't apply to StartTLS */
 706
 707                 if( op->o_tag == LDAP_REQ_EXTENDED ) {
 708                         /* threat other extended operations as update ops */
 709                         updateop++;
 710                 }
 711
 712                 if( op->o_ssf < ssf->sss_ssf ) {
 713                         *text = "confidentiality required";
 714                         return LDAP_CONFIDENTIALITY_REQUIRED;
 715                 }
 716                 if( op->o_transport_ssf < ssf->sss_transport ) {
 717                         *text = "transport confidentiality required";
 718                         return LDAP_CONFIDENTIALITY_REQUIRED;
 719                 }
 720                 if( op->o_tls_ssf < ssf->sss_tls ) {
 721                         *text = "TLS confidentiality required";
 722                         return LDAP_CONFIDENTIALITY_REQUIRED;
 723                 }
 724                 if( op->o_sasl_ssf < ssf->sss_sasl ) {
 725                         *text = "SASL confidentiality required";
 726                         return LDAP_CONFIDENTIALITY_REQUIRED;
 727                 }
 728
 729                 if( updateop ) {
 730                         if( op->o_ssf < ssf->sss_update_ssf ) {
 731                                 *text = "update confidentiality required";
 732                                 return LDAP_CONFIDENTIALITY_REQUIRED;
 733                         }
 734                         if( op->o_transport_ssf < ssf->sss_update_transport ) {
 735                                 *text = "transport update confidentiality required";
 736                                 return LDAP_CONFIDENTIALITY_REQUIRED;
 737                         }
 738                         if( op->o_tls_ssf < ssf->sss_update_tls ) {
 739                                 *text = "TLS update confidentiality required";
 740                                 return LDAP_CONFIDENTIALITY_REQUIRED;
 741                         }
 742                         if( op->o_sasl_ssf < ssf->sss_update_sasl ) {
 743                                 *text = "SASL update confidentiality required";
 744                                 return LDAP_CONFIDENTIALITY_REQUIRED;
 745                         }
 746                 }
 747         }
 748
 749         if (( extoid == NULL || strcmp( extoid, LDAP_EXOP_START_TLS ) )
 750                 || op->o_tag == LDAP_REQ_BIND )
 751         {
 752                 /* these checks don't apply to StartTLS or Bind */
 753
 754                 if( requires & SLAP_REQUIRE_STRONG ) {
 755                         /* should check mechanism */
 756                         if( op->o_authmech == NULL ||
 757                                 op->o_dn == NULL || *op->o_dn == '\0' )
 758                         {
 759                                 *text = "strong authentication required";
 760                                 return LDAP_STRONG_AUTH_REQUIRED;
 761                         }
 762                 }
 763
 764                 if( requires & SLAP_REQUIRE_SASL ) {
 765                         if( op->o_authmech == NULL ||
 766                                 op->o_dn == NULL || *op->o_dn == '\0' )
 767                         {
 768                                 *text = "SASL authentication required";
 769                                 return LDAP_STRONG_AUTH_REQUIRED;
 770                         }
 771                 }
 772
 773                 if( requires & SLAP_REQUIRE_AUTHC ) {
 774                         if( op->o_dn == NULL || *op->o_dn == '\0' ) {
 775                                 *text = "authentication required";
 776                                 return LDAP_UNWILLING_TO_PERFORM;
 777                         }
 778                 }
 779
 780                 if( requires & SLAP_REQUIRE_BIND ) {
 781                         int version;
 782                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 783                         version = conn->c_protocol;
 784                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 785
 786                         if( !version ) {
 787                                 /* no bind has occurred */
 788                                 *text = "BIND required";
 789                                 return LDAP_OPERATIONS_ERROR;
 790                         }
 791                 }
 792
 793                 if( requires & SLAP_REQUIRE_LDAP_V3 ) {
 794                         if( op->o_protocol < LDAP_VERSION3 ) {
 795                                 /* no bind has occurred */
 796                                 *text = "operation restricted to LDAPv3 clients";
 797                                 return LDAP_OPERATIONS_ERROR;
 798                         }
 799                 }
 800         }
 801
 802         if( restrictops & opflag ) {
 803                 if( restrictops == SLAP_RESTRICT_OP_READS ) {
 804                         *text = "read operations restricted";
 805                 } else {
 806                         *text = "operation restricted";
 807                 }
 808                 return LDAP_UNWILLING_TO_PERFORM;
 809         }
 810
 811         return LDAP_SUCCESS;
 812 }
 813
 814 int backend_check_referrals(
 815         Backend *be,
 816         Connection *conn,
 817         Operation *op,
 818         const char *dn,
 819         const char *ndn )
 820 {
 821         int rc = LDAP_SUCCESS;
 822
 823         if( be->be_chk_referrals ) {
 824                 const char *text;
 825
 826                 rc = be->be_chk_referrals( be,
 827                         conn, op, dn, ndn, &text );
 828
 829                 if( rc != LDAP_SUCCESS && rc != LDAP_REFERRAL ) {
 830                         send_ldap_result( conn, op, rc,
 831                                 NULL, text, NULL, NULL );
 832                 }
 833         }
 834
 835         return rc;
 836 }
 837
 838 int
 839 backend_group(
 840         Backend *be,
 841         Entry   *target,
 842         const char      *gr_ndn,
 843         const char      *op_ndn,
 844         ObjectClass *group_oc,
 845         AttributeDescription *group_at
 846 )
 847 {
 848         if( strcmp( target->e_ndn, gr_ndn ) != 0 ) {
 849                 /* we won't attempt to send it to a different backend */
 850
 851                 be = select_backend(gr_ndn, 0);
 852
 853                 if (be == NULL) {
 854                         return LDAP_NO_SUCH_OBJECT;
 855                 }
 856         }
 857
 858         if( be->be_group ) {
 859                 return be->be_group( be, target, gr_ndn, op_ndn,
 860                         group_oc, group_at );
 861         }
 862
 863         return LDAP_UNWILLING_TO_PERFORM;
 864 }
 865
 866 int
 867 backend_attribute(
 868         Backend *be,
 869         Connection *conn,
 870         Operation *op,
 871         Entry   *target,
 872         const char      *e_ndn,
 873         AttributeDescription *entry_at,
 874         struct berval ***vals
 875 )
 876 {
 877         if( target == NULL || strcmp( target->e_ndn, e_ndn ) != 0 ) {
 878                 /* we won't attempt to send it to a different backend */
 879
 880                 be = select_backend(e_ndn, 0);
 881
 882                 if (be == NULL) {
 883                         return LDAP_NO_SUCH_OBJECT;
 884                 }
 885         }
 886
 887         if( be->be_attribute ) {
 888                 return be->be_attribute( be, conn, op, target, e_ndn,
 889                         entry_at, vals );
 890         }
 891
 892         return LDAP_UNWILLING_TO_PERFORM;
 893 }
 894
 895 Attribute *backend_operational(
 896         Backend *be,
 897         Entry *e )
 898 {
 899         Attribute *a = NULL;
 900
 901 #ifdef SLAPD_SCHEMA_DN
 902         a = ch_malloc( sizeof( Attribute ) );
 903         a->a_desc = ad_dup( slap_schema.si_ad_subschemaSubentry );
 904
 905         /* Should be backend specific */
 906         a->a_vals = ch_malloc( 2 * sizeof( struct berval * ) );
 907         a->a_vals[0] = ber_bvstrdup( SLAPD_SCHEMA_DN );
 908         a->a_vals[1] = NULL;
 909
 910         a->a_next = NULL;
 911 #endif
 912
 913         return a;
 914 }