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

   1 /* schema_check.c - routines to enforce schema definitions */
   2 /* $OpenLDAP$ */
   3 /*
   4  * Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
   5  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   6  */
   7
   8 #include "portable.h"
   9
  10 #include <stdio.h>
  11
  12 #include <ac/ctype.h>
  13 #include <ac/string.h>
  14 #include <ac/socket.h>
  15
  16 #include "slap.h"
  17 #include "ldap_pvt.h"
  18
  19 static char * oc_check_required(
  20         Entry *e,
  21         ObjectClass *oc,
  22         struct berval *ocname );
  23
  24 /*
  25  * entry_schema_check - check that entry e conforms to the schema required
  26  * by its object class(es).
  27  *
  28  * returns 0 if so, non-zero otherwise.
  29  */
  30
  31 int
  32 entry_schema_check(
  33         Backend *be,
  34         Entry *e,
  35         Attribute *oldattrs,
  36         const char** text,
  37         char *textbuf, size_t textlen )
  38 {
  39         Attribute       *a, *asc, *aoc;
  40         ObjectClass *sc, *oc;
  41 #ifdef SLAP_EXTENDED_SCHEMA
  42         AttributeType *at;
  43         ContentRule *cr;
  44 #endif
  45         int     rc, i;
  46         struct berval nsc;
  47         AttributeDescription *ad_structuralObjectClass
  48                 = slap_schema.si_ad_structuralObjectClass;
  49         AttributeDescription *ad_objectClass
  50                 = slap_schema.si_ad_objectClass;
  51         int extensible = 0;
  52         int subentry = is_entry_subentry( e );
  53         int collectiveSubentry = 0;
  54
  55         if( subentry ) {
  56                 collectiveSubentry = is_entry_collectiveAttributeSubentry( e );
  57         }
  58
  59         *text = textbuf;
  60
  61         /* misc attribute checks */
  62         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
  63                 const char *type = a->a_desc->ad_cname.bv_val;
  64
  65                 /* there should be at least one value */
  66                 assert( a->a_vals );
  67                 assert( a->a_vals[0].bv_val != NULL );
  68
  69                 if( a->a_desc->ad_type->sat_check ) {
  70                         int rc = (a->a_desc->ad_type->sat_check)(
  71                                 be, e, a, text, textbuf, textlen );
  72                         if( rc != LDAP_SUCCESS ) {
  73                                 return rc;
  74                         }
  75                 }
  76
  77                 if( !collectiveSubentry && is_at_collective( a->a_desc->ad_type ) ) {
  78                         snprintf( textbuf, textlen,
  79                                 "'%s' can only appear in collectiveAttributeSubentry",
  80                                 type );
  81                         return LDAP_OBJECT_CLASS_VIOLATION;
  82                 }
  83
  84                 /* if single value type, check for multiple values */
  85                 if( is_at_single_value( a->a_desc->ad_type ) &&
  86                         a->a_vals[1].bv_val != NULL )
  87                 {
  88                         snprintf( textbuf, textlen,
  89                                 "attribute '%s' cannot have multiple values",
  90                                 type );
  91
  92 #ifdef NEW_LOGGING
  93                         LDAP_LOG( OPERATION, INFO,
  94                                 "entry_schema_check: dn=\"%s\" %s\n", e->e_dn, textbuf, 0 );
  95 #else
  96                         Debug( LDAP_DEBUG_ANY,
  97                             "Entry (%s), %s\n",
  98                             e->e_dn, textbuf, 0 );
  99 #endif
 100
 101                         return LDAP_CONSTRAINT_VIOLATION;
 102                 }
 103         }
 104
 105         /* it's a REALLY bad idea to disable schema checks */
 106         if( !global_schemacheck ) return LDAP_SUCCESS;
 107
 108         /* find the structural object class attribute */
 109         asc = attr_find( e->e_attrs, ad_structuralObjectClass );
 110         if ( asc == NULL ) {
 111 #ifdef NEW_LOGGING
 112                 LDAP_LOG( OPERATION, INFO,
 113                         "entry_schema_check: No structuralObjectClass for entry (%s)\n",
 114                         e->e_dn, 0, 0 );
 115 #else
 116                 Debug( LDAP_DEBUG_ANY,
 117                         "No structuralObjectClass for entry (%s)\n",
 118                     e->e_dn, 0, 0 );
 119 #endif
 120
 121                 *text = "no structuralObjectClass operational attribute";
 122                 return LDAP_OTHER;
 123         }
 124
 125         assert( asc->a_vals != NULL );
 126         assert( asc->a_vals[0].bv_val != NULL );
 127         assert( asc->a_vals[1].bv_val == NULL );
 128
 129         sc = oc_bvfind( &asc->a_vals[0] );
 130         if( sc == NULL ) {
 131                 snprintf( textbuf, textlen,
 132                         "unrecognized structuralObjectClass '%s'",
 133                         asc->a_vals[0].bv_val );
 134
 135 #ifdef NEW_LOGGING
 136                 LDAP_LOG( OPERATION, INFO,
 137                         "entry_schema_check: dn (%s), %s\n", e->e_dn, textbuf, 0 );
 138 #else
 139                 Debug( LDAP_DEBUG_ANY,
 140                         "entry_check_schema(%s): %s\n",
 141                         e->e_dn, textbuf, 0 );
 142 #endif
 143
 144                 return LDAP_OBJECT_CLASS_VIOLATION;
 145         }
 146
 147         if( sc->soc_kind != LDAP_SCHEMA_STRUCTURAL ) {
 148                 snprintf( textbuf, textlen,
 149                         "structuralObjectClass '%s' is not STRUCTURAL",
 150                         asc->a_vals[0].bv_val );
 151
 152 #ifdef NEW_LOGGING
 153                 LDAP_LOG( OPERATION, INFO,
 154                         "entry_schema_check: dn (%s), %s\n", e->e_dn, textbuf, 0 );
 155 #else
 156                 Debug( LDAP_DEBUG_ANY,
 157                         "entry_check_schema(%s): %s\n",
 158                         e->e_dn, textbuf, 0 );
 159 #endif
 160
 161                 return LDAP_OTHER;
 162         }
 163
 164         /* find the object class attribute */
 165         aoc = attr_find( e->e_attrs, ad_objectClass );
 166         if ( aoc == NULL ) {
 167 #ifdef NEW_LOGGING
 168                 LDAP_LOG( OPERATION, INFO,
 169                         "entry_schema_check: No objectClass for entry (%s).\n",
 170                         e->e_dn, 0, 0 );
 171 #else
 172                 Debug( LDAP_DEBUG_ANY, "No objectClass for entry (%s)\n",
 173                     e->e_dn, 0, 0 );
 174 #endif
 175
 176                 *text = "no objectClass attribute";
 177                 return LDAP_OBJECT_CLASS_VIOLATION;
 178         }
 179
 180         assert( aoc->a_vals != NULL );
 181         assert( aoc->a_vals[0].bv_val != NULL );
 182
 183         rc = structural_class( aoc->a_vals, &nsc, &oc, text, textbuf, textlen );
 184         if( rc != LDAP_SUCCESS ) {
 185                 return rc;
 186         }
 187
 188         *text = textbuf;
 189
 190         if ( oc == NULL ) {
 191                 snprintf( textbuf, textlen,
 192                         "unrecognized objectClass '%s'",
 193                         aoc->a_vals[0].bv_val );
 194                 return LDAP_OBJECT_CLASS_VIOLATION;
 195
 196         } else if ( sc != oc ) {
 197                 snprintf( textbuf, textlen,
 198                         "structural object class modification from '%s' to '%s' not allowed",
 199                         asc->a_vals[0].bv_val, nsc.bv_val );
 200                 return LDAP_NO_OBJECT_CLASS_MODS;
 201         }
 202
 203 #ifdef SLAP_EXTENDED_SCHEMA
 204         /* find the content rule for the structural class */
 205         cr = cr_find( sc->soc_oid );
 206
 207         /* the cr must be same as the structural class */
 208         assert( !cr || !strcmp( cr->scr_oid, sc->soc_oid ) );
 209
 210         /* check that the entry has required attrs of the content rule */
 211         if( cr && cr->scr_required ) {
 212                 for( i=0; cr->scr_required[i]; i++ ) {
 213                         at = cr->scr_required[i];
 214
 215                         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 216                                 if( a->a_desc->ad_type == at ) {
 217                                         break;
 218                                 }
 219                         }
 220
 221                         /* not there => schema violation */
 222                         if ( a == NULL ) {
 223                                 snprintf( textbuf, textlen,
 224                                         "content rule '%s' requires attribute '%s'",
 225                                         ldap_contentrule2name( &cr->scr_crule ),
 226                                         at->sat_cname.bv_val );
 227
 228 #ifdef NEW_LOGGING
 229                                 LDAP_LOG( OPERATION, INFO,
 230                                         "entry_schema_check: dn=\"%s\" %s", e->e_dn, textbuf, 0 );
 231 #else
 232                                 Debug( LDAP_DEBUG_ANY,
 233                                         "Entry (%s): %s\n",
 234                                         e->e_dn, textbuf, 0 );
 235 #endif
 236
 237                                 return LDAP_OBJECT_CLASS_VIOLATION;
 238                         }
 239                 }
 240         }
 241
 242         if( cr && cr->scr_precluded ) {
 243                 for( i=0; cr->scr_precluded[i]; i++ ) {
 244                         at = cr->scr_precluded[i];
 245
 246                         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 247                                 if( a->a_desc->ad_type == at ) {
 248                                         break;
 249                                 }
 250                         }
 251
 252                         /* there => schema violation */
 253                         if ( a != NULL ) {
 254                                 snprintf( textbuf, textlen,
 255                                         "content rule '%s' precluded attribute '%s'",
 256                                         ldap_contentrule2name( &cr->scr_crule ),
 257                                         at->sat_cname.bv_val );
 258
 259 #ifdef NEW_LOGGING
 260                                 LDAP_LOG( OPERATION, INFO,
 261                                         "entry_schema_check: dn=\"%s\" %s", e->e_dn, textbuf, 0 );
 262 #else
 263                                 Debug( LDAP_DEBUG_ANY,
 264                                         "Entry (%s): %s\n",
 265                                         e->e_dn, textbuf, 0 );
 266 #endif
 267
 268                                 return LDAP_OBJECT_CLASS_VIOLATION;
 269                         }
 270                 }
 271         }
 272 #endif /* SLAP_EXTENDED_SCHEMA */
 273
 274         /* check that the entry has required attrs for each oc */
 275         for ( i = 0; aoc->a_vals[i].bv_val != NULL; i++ ) {
 276                 if ( (oc = oc_bvfind( &aoc->a_vals[i] )) == NULL ) {
 277                         snprintf( textbuf, textlen,
 278                                 "unrecognized objectClass '%s'",
 279                                 aoc->a_vals[i].bv_val );
 280
 281 #ifdef NEW_LOGGING
 282                         LDAP_LOG( OPERATION, INFO,
 283                                 "entry_schema_check: dn (%s), %s\n", e->e_dn, textbuf, 0 );
 284 #else
 285                         Debug( LDAP_DEBUG_ANY,
 286                                 "entry_check_schema(%s): %s\n",
 287                                 e->e_dn, textbuf, 0 );
 288 #endif
 289
 290                         return LDAP_OBJECT_CLASS_VIOLATION;
 291                 }
 292
 293                 if ( oc->soc_check ) {
 294                         int rc = (oc->soc_check)( be, e, oc,
 295                                 text, textbuf, textlen );
 296                         if( rc != LDAP_SUCCESS ) {
 297                                 return rc;
 298                         }
 299                 }
 300
 301                 if ( oc->soc_kind == LDAP_SCHEMA_ABSTRACT ) {
 302                         /* object class is abstract */
 303                         if ( oc != slap_schema.si_oc_top &&
 304                                 !is_object_subclass( oc, sc ))
 305                         {
 306                                 int j;
 307                                 ObjectClass *xc = NULL;
 308                                 for( j=0; aoc->a_vals[j].bv_val; j++ ) {
 309                                         if( i != j ) {
 310                                                 xc = oc_bvfind( &aoc->a_vals[i] );
 311                                                 if( xc == NULL ) {
 312                                                         snprintf( textbuf, textlen,
 313                                                                 "unrecognized objectClass '%s'",
 314                                                                 aoc->a_vals[i].bv_val );
 315
 316 #ifdef NEW_LOGGING
 317                                                         LDAP_LOG( OPERATION, INFO,
 318                                                                 "entry_schema_check: dn (%s), %s\n",
 319                                                                 e->e_dn, textbuf, 0 );
 320 #else
 321                                                         Debug( LDAP_DEBUG_ANY,
 322                                                                 "entry_check_schema(%s): %s\n",
 323                                                                 e->e_dn, textbuf, 0 );
 324 #endif
 325
 326                                                         return LDAP_OBJECT_CLASS_VIOLATION;
 327                                                 }
 328
 329                                                 /* since we previous check against the
 330                                                  * structural object of this entry, the
 331                                                  * abstract class must be a (direct or indirect)
 332                                                  * superclass of one of the auxiliary classes of
 333                                                  * the entry.
 334                                                  */
 335                                                 if ( xc->soc_kind == LDAP_SCHEMA_AUXILIARY &&
 336                                                         is_object_subclass( oc, xc ) )
 337                                                 {
 338                                                         xc = NULL;
 339                                                         break;
 340                                                 }
 341                                         }
 342                                 }
 343
 344                                 if( xc == NULL ) {
 345                                         snprintf( textbuf, textlen, "instanstantiation of "
 346                                                 "abstract objectClass '%s' not allowed",
 347                                                 aoc->a_vals[i].bv_val );
 348
 349 #ifdef NEW_LOGGING
 350                                         LDAP_LOG( OPERATION, INFO,
 351                                                 "entry_schema_check: dn (%s), %s\n",
 352                                                 e->e_dn, textbuf, 0 );
 353 #else
 354                                         Debug( LDAP_DEBUG_ANY,
 355                                                 "entry_check_schema(%s): %s\n",
 356                                                 e->e_dn, textbuf, 0 );
 357 #endif
 358
 359                                         return LDAP_OBJECT_CLASS_VIOLATION;
 360                                 }
 361                         }
 362
 363                 } else if ( oc->soc_kind != LDAP_SCHEMA_STRUCTURAL || oc == sc ) {
 364                         char *s;
 365
 366 #ifdef SLAP_EXTENDED_SCHEMA
 367                         if( oc->soc_kind == LDAP_SCHEMA_AUXILIARY ) {
 368                                 int k=0;
 369                                 if( cr ) {
 370                                         if( cr->scr_auxiliaries ) {
 371                                                 for( ; cr->scr_auxiliaries[k]; k++ ) {
 372                                                         if( cr->scr_auxiliaries[k] == oc ) {
 373                                                                 k=-1;
 374                                                                 break;
 375                                                         }
 376                                                 }
 377                                         }
 378                                 } else if ( global_disallows & SLAP_DISALLOW_AUX_WO_CR ) {
 379                                         k=-1;
 380                                 }
 381
 382                                 if( k == -1 ) {
 383                                         snprintf( textbuf, textlen,
 384                                                 "content rule '%s' does not allow class '%s'",
 385                                                 ldap_contentrule2name( &cr->scr_crule ),
 386                                                 oc->soc_cname.bv_val );
 387
 388 #ifdef NEW_LOGGING
 389                                         LDAP_LOG( OPERATION, INFO,
 390                                                 "entry_schema_check: dn=\"%s\" %s",
 391                                                 e->e_dn, textbuf, 0 );
 392 #else
 393                                         Debug( LDAP_DEBUG_ANY,
 394                                                 "Entry (%s): %s\n",
 395                                                 e->e_dn, textbuf, 0 );
 396 #endif
 397
 398                                         return LDAP_OBJECT_CLASS_VIOLATION;
 399                                 }
 400                         }
 401 #endif /* SLAP_EXTENDED_SCHEMA */
 402
 403                         s = oc_check_required( e, oc, &aoc->a_vals[i] );
 404                         if (s != NULL) {
 405                                 snprintf( textbuf, textlen,
 406                                         "object class '%s' requires attribute '%s'",
 407                                         aoc->a_vals[i].bv_val, s );
 408
 409 #ifdef NEW_LOGGING
 410                                 LDAP_LOG( OPERATION, INFO,
 411                                         "entry_schema_check: dn=\"%s\" %s", e->e_dn, textbuf, 0 );
 412 #else
 413                                 Debug( LDAP_DEBUG_ANY,
 414                                         "Entry (%s): %s\n",
 415                                         e->e_dn, textbuf, 0 );
 416 #endif
 417
 418                                 return LDAP_OBJECT_CLASS_VIOLATION;
 419                         }
 420
 421                         if( oc == slap_schema.si_oc_extensibleObject ) {
 422                                 extensible=1;
 423                         }
 424                 }
 425         }
 426
 427         if( extensible ) {
 428                 return LDAP_SUCCESS;
 429         }
 430
 431         /* check that each attr in the entry is allowed by some oc */
 432         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 433                 int ret;
 434
 435 #ifdef SLAP_EXTENDED_SCHEMA
 436                 ret = LDAP_OBJECT_CLASS_VIOLATION;
 437
 438                 if( cr && cr->scr_required ) {
 439                         for( i=0; cr->scr_required[i]; i++ ) {
 440                                 if( cr->scr_required[i] == a->a_desc->ad_type ) {
 441                                         ret = LDAP_SUCCESS;
 442                                         break;
 443                                 }
 444                         }
 445                 }
 446
 447                 if( ret != LDAP_SUCCESS && cr && cr->scr_allowed ) {
 448                         for( i=0; cr->scr_allowed[i]; i++ ) {
 449                                 if( cr->scr_allowed[i] == a->a_desc->ad_type ) {
 450                                         ret = LDAP_SUCCESS;
 451                                         break;
 452                                 }
 453                         }
 454                 }
 455
 456                 if( ret != LDAP_SUCCESS )
 457 #endif /* SLAP_EXTENDED_SCHEMA */
 458                 {
 459                         ret = oc_check_allowed( a->a_desc->ad_type, aoc->a_vals, sc );
 460                 }
 461
 462                 if ( ret != LDAP_SUCCESS ) {
 463                         char *type = a->a_desc->ad_cname.bv_val;
 464
 465                         snprintf( textbuf, textlen,
 466                                 "attribute '%s' not allowed",
 467                                 type );
 468
 469 #ifdef NEW_LOGGING
 470                         LDAP_LOG( OPERATION, INFO,
 471                                 "entry_schema_check: dn=\"%s\" %s\n", e->e_dn, textbuf, 0);
 472 #else
 473                         Debug( LDAP_DEBUG_ANY,
 474                             "Entry (%s), %s\n",
 475                             e->e_dn, textbuf, 0 );
 476 #endif
 477
 478                         return ret;
 479                 }
 480         }
 481
 482         return LDAP_SUCCESS;
 483 }
 484
 485 static char *
 486 oc_check_required(
 487         Entry *e,
 488         ObjectClass *oc,
 489         struct berval *ocname )
 490 {
 491         AttributeType   *at;
 492         int             i;
 493         Attribute       *a;
 494
 495 #ifdef NEW_LOGGING
 496         LDAP_LOG( OPERATION, ENTRY,
 497                 "oc_check_required: dn (%s), objectClass \"%s\"\n",
 498                 e->e_dn, ocname->bv_val, 0 );
 499 #else
 500         Debug( LDAP_DEBUG_TRACE,
 501                 "oc_check_required entry (%s), objectClass \"%s\"\n",
 502                 e->e_dn, ocname->bv_val, 0 );
 503 #endif
 504
 505
 506         /* check for empty oc_required */
 507         if(oc->soc_required == NULL) {
 508                 return NULL;
 509         }
 510
 511         /* for each required attribute */
 512         for ( i = 0; oc->soc_required[i] != NULL; i++ ) {
 513                 at = oc->soc_required[i];
 514                 /* see if it's in the entry */
 515                 for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 516                         if( a->a_desc->ad_type == at ) {
 517                                 break;
 518                         }
 519                 }
 520                 /* not there => schema violation */
 521                 if ( a == NULL ) {
 522                         return at->sat_cname.bv_val;
 523                 }
 524         }
 525
 526         return( NULL );
 527 }
 528
 529 int oc_check_allowed(
 530         AttributeType *at,
 531         BerVarray ocl,
 532         ObjectClass *sc )
 533 {
 534         int             i, j;
 535
 536 #ifdef NEW_LOGGING
 537         LDAP_LOG( OPERATION, ENTRY,
 538                 "oc_check_allowed: type \"%s\"\n", at->sat_cname.bv_val, 0, 0 );
 539 #else
 540         Debug( LDAP_DEBUG_TRACE,
 541                 "oc_check_allowed type \"%s\"\n",
 542                 at->sat_cname.bv_val, 0, 0 );
 543 #endif
 544
 545         /* always allow objectClass attribute */
 546         if ( strcasecmp( at->sat_cname.bv_val, "objectClass" ) == 0 ) {
 547                 return LDAP_SUCCESS;
 548         }
 549
 550         /*
 551          * All operational attributions are allowed by schema rules.
 552          */
 553         if( is_at_operational(at) ) {
 554                 return LDAP_SUCCESS;
 555         }
 556
 557         /* check to see if its allowed by the structuralObjectClass */
 558         if( sc ) {
 559                 /* does it require the type? */
 560                 for ( j = 0; sc->soc_required != NULL &&
 561                         sc->soc_required[j] != NULL; j++ )
 562                 {
 563                         if( at == sc->soc_required[j] ) {
 564                                 return LDAP_SUCCESS;
 565                         }
 566                 }
 567
 568                 /* does it allow the type? */
 569                 for ( j = 0; sc->soc_allowed != NULL &&
 570                         sc->soc_allowed[j] != NULL; j++ )
 571                 {
 572                         if( at == sc->soc_allowed[j] ) {
 573                                 return LDAP_SUCCESS;
 574                         }
 575                 }
 576         }
 577
 578         /* check that the type appears as req or opt in at least one oc */
 579         for ( i = 0; ocl[i].bv_val != NULL; i++ ) {
 580                 /* if we know about the oc */
 581                 ObjectClass     *oc = oc_bvfind( &ocl[i] );
 582                 if ( oc != NULL && oc->soc_kind != LDAP_SCHEMA_ABSTRACT &&
 583                         ( sc == NULL || oc->soc_kind == LDAP_SCHEMA_AUXILIARY ))
 584                 {
 585                         /* does it require the type? */
 586                         for ( j = 0; oc->soc_required != NULL &&
 587                                 oc->soc_required[j] != NULL; j++ )
 588                         {
 589                                 if( at == oc->soc_required[j] ) {
 590                                         return LDAP_SUCCESS;
 591                                 }
 592                         }
 593                         /* does it allow the type? */
 594                         for ( j = 0; oc->soc_allowed != NULL &&
 595                                 oc->soc_allowed[j] != NULL; j++ )
 596                         {
 597                                 if( at == oc->soc_allowed[j] ) {
 598                                         return LDAP_SUCCESS;
 599                                 }
 600                         }
 601                 }
 602         }
 603
 604         /* not allowed by any oc */
 605         return LDAP_OBJECT_CLASS_VIOLATION;
 606 }
 607
 608 /*
 609  * Determine the structural object class from a set of OIDs
 610  */
 611 int structural_class(
 612         BerVarray ocs,
 613         struct berval *scbv,
 614         ObjectClass **scp,
 615         const char **text,
 616         char *textbuf, size_t textlen )
 617 {
 618         int i;
 619         ObjectClass *oc;
 620         ObjectClass *sc = NULL;
 621         int scn = -1;
 622
 623         *text = "structural_class: internal error";
 624         scbv->bv_len = 0;
 625
 626         for( i=0; ocs[i].bv_val; i++ ) {
 627                 oc = oc_bvfind( &ocs[i] );
 628
 629                 if( oc == NULL ) {
 630                         snprintf( textbuf, textlen,
 631                                 "unrecognized objectClass '%s'",
 632                                 ocs[i].bv_val );
 633                         *text = textbuf;
 634                         return LDAP_OBJECT_CLASS_VIOLATION;
 635                 }
 636
 637                 if( oc->soc_kind == LDAP_SCHEMA_STRUCTURAL ) {
 638                         if( sc == NULL || is_object_subclass( sc, oc ) ) {
 639                                 sc = oc;
 640                                 scn = i;
 641
 642                         } else if ( !is_object_subclass( oc, sc ) ) {
 643                                 int j;
 644                                 ObjectClass *xc = NULL;
 645
 646                                 /* find common superior */
 647                                 for( j=i+1; ocs[j].bv_val; j++ ) {
 648                                         xc = oc_bvfind( &ocs[j] );
 649
 650                                         if( xc == NULL ) {
 651                                                 snprintf( textbuf, textlen,
 652                                                         "unrecognized objectClass '%s'",
 653                                                         ocs[i].bv_val );
 654                                                 *text = textbuf;
 655                                                 return LDAP_OBJECT_CLASS_VIOLATION;
 656                                         }
 657
 658                                         if( xc->soc_kind != LDAP_SCHEMA_STRUCTURAL ) {
 659                                                 xc = NULL;
 660                                                 continue;
 661                                         }
 662
 663                                         if( is_object_subclass( sc, xc ) &&
 664                                                 is_object_subclass( oc, xc ) )
 665                                         {
 666                                                 /* found common subclass */
 667                                                 break;
 668                                         }
 669
 670                                         xc = NULL;
 671                                 }
 672
 673                                 if( xc == NULL ) {
 674                                         /* no common subclass */
 675                                         snprintf( textbuf, textlen,
 676                                                 "invalid structural object class chain (%s/%s)",
 677                                                 ocs[scn].bv_val, ocs[i].bv_val );
 678                                         *text = textbuf;
 679                                         return LDAP_OBJECT_CLASS_VIOLATION;
 680                                 }
 681                         }
 682                 }
 683         }
 684
 685         if( scp ) {
 686                 *scp = sc;
 687         }
 688
 689         if( sc == NULL ) {
 690                 *text = "no structural object classes provided";
 691                 return LDAP_OBJECT_CLASS_VIOLATION;
 692         }
 693
 694         if( scn < 0 ) {
 695                 *text = "invalid structural object class";
 696                 return LDAP_OBJECT_CLASS_VIOLATION;
 697         }
 698
 699         *scbv = ocs[scn];
 700
 701         if( scbv->bv_len == 0 ) {
 702                 *text = "invalid structural object class";
 703                 return LDAP_OBJECT_CLASS_VIOLATION;
 704         }
 705
 706         return LDAP_SUCCESS;
 707 }
 708
 709 /*
 710  * Return structural object class from list of modifications
 711  */
 712 int mods_structural_class(
 713         Modifications *mods,
 714         struct berval *sc,
 715         const char **text,
 716         char *textbuf, size_t textlen )
 717 {
 718         Modifications *ocmod = NULL;
 719
 720         for( ; mods != NULL; mods = mods->sml_next ) {
 721                 if( mods->sml_desc == slap_schema.si_ad_objectClass ) {
 722                         if( ocmod != NULL ) {
 723                                 *text = "entry has multiple objectClass attributes";
 724                                 return LDAP_OBJECT_CLASS_VIOLATION;
 725                         }
 726                         ocmod = mods;
 727                 }
 728         }
 729
 730         if( ocmod == NULL ) {
 731                 *text = "entry has no objectClass attribute";
 732                 return LDAP_OBJECT_CLASS_VIOLATION;
 733         }
 734
 735         if( ocmod->sml_bvalues == NULL || ocmod->sml_bvalues[0].bv_val == NULL ) {
 736                 *text = "objectClass attribute has no values";
 737                 return LDAP_OBJECT_CLASS_VIOLATION;
 738         }
 739
 740         return structural_class( ocmod->sml_bvalues, sc, NULL,
 741                 text, textbuf, textlen );
 742 }