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

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2013 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /* Portions Copyright (c) 1995 Regents of the University of Michigan.
  16  * All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms are permitted
  19  * provided that this notice is preserved and that due credit is given
  20  * to the University of Michigan at Ann Arbor. The name of the University
  21  * may not be used to endorse or promote products derived from this
  22  * software without specific prior written permission. This software
  23  * is provided ``as is'' without express or implied warranty.
  24  */
  25
  26 #include "portable.h"
  27
  28 #include <stdio.h>
  29 #include <ac/socket.h>
  30 #include <ac/string.h>
  31
  32 #include "slap.h"
  33
  34 int
  35 do_compare(
  36     Operation   *op,
  37     SlapReply   *rs )
  38 {
  39         struct berval dn = BER_BVNULL;
  40         struct berval desc = BER_BVNULL;
  41         struct berval value = BER_BVNULL;
  42         AttributeAssertion ava = ATTRIBUTEASSERTION_INIT;
  43
  44         Debug( LDAP_DEBUG_TRACE, "%s do_compare\n",
  45                 op->o_log_prefix, 0, 0 );
  46         /*
  47          * Parse the compare request.  It looks like this:
  48          *
  49          *      CompareRequest := [APPLICATION 14] SEQUENCE {
  50          *              entry   DistinguishedName,
  51          *              ava     SEQUENCE {
  52          *                      type    AttributeType,
  53          *                      value   AttributeValue
  54          *              }
  55          *      }
  56          */
  57
  58         if ( ber_scanf( op->o_ber, "{m" /*}*/, &dn ) == LBER_ERROR ) {
  59                 Debug( LDAP_DEBUG_ANY, "%s do_compare: ber_scanf failed\n",
  60                         op->o_log_prefix, 0, 0 );
  61                 send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
  62                 return SLAPD_DISCONNECT;
  63         }
  64
  65         if ( ber_scanf( op->o_ber, "{mm}", &desc, &value ) == LBER_ERROR ) {
  66                 Debug( LDAP_DEBUG_ANY, "%s do_compare: get ava failed\n",
  67                         op->o_log_prefix, 0, 0 );
  68                 send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
  69                 return SLAPD_DISCONNECT;
  70         }
  71
  72         if ( ber_scanf( op->o_ber, /*{*/ "}" ) == LBER_ERROR ) {
  73                 Debug( LDAP_DEBUG_ANY, "%s do_compare: ber_scanf failed\n",
  74                         op->o_log_prefix, 0, 0 );
  75                 send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
  76                 return SLAPD_DISCONNECT;
  77         }
  78
  79         if( get_ctrls( op, rs, 1 ) != LDAP_SUCCESS ) {
  80                 Debug( LDAP_DEBUG_ANY, "%s do_compare: get_ctrls failed\n",
  81                         op->o_log_prefix, 0, 0 );
  82                 goto cleanup;
  83         }
  84
  85         rs->sr_err = dnPrettyNormal( NULL, &dn, &op->o_req_dn, &op->o_req_ndn,
  86                 op->o_tmpmemctx );
  87         if( rs->sr_err != LDAP_SUCCESS ) {
  88                 Debug( LDAP_DEBUG_ANY, "%s do_compare: invalid dn (%s)\n",
  89                         op->o_log_prefix, dn.bv_val, 0 );
  90                 send_ldap_error( op, rs, LDAP_INVALID_DN_SYNTAX, "invalid DN" );
  91                 goto cleanup;
  92         }
  93
  94         Statslog( LDAP_DEBUG_STATS,
  95                 "%s CMP dn=\"%s\" attr=\"%s\"\n",
  96                 op->o_log_prefix, op->o_req_dn.bv_val,
  97                 desc.bv_val, 0, 0 );
  98
  99         rs->sr_err = slap_bv2ad( &desc, &ava.aa_desc, &rs->sr_text );
 100         if( rs->sr_err != LDAP_SUCCESS ) {
 101                 rs->sr_err = slap_bv2undef_ad( &desc, &ava.aa_desc,
 102                                 &rs->sr_text,
 103                                 SLAP_AD_PROXIED|SLAP_AD_NOINSERT );
 104                 if( rs->sr_err != LDAP_SUCCESS ) {
 105                         send_ldap_result( op, rs );
 106                         goto cleanup;
 107                 }
 108         }
 109
 110         rs->sr_err = asserted_value_validate_normalize( ava.aa_desc,
 111                 ava.aa_desc->ad_type->sat_equality,
 112                 SLAP_MR_EQUALITY|SLAP_MR_VALUE_OF_ASSERTION_SYNTAX,
 113                 &value, &ava.aa_value, &rs->sr_text, op->o_tmpmemctx );
 114         if( rs->sr_err != LDAP_SUCCESS ) {
 115                 send_ldap_result( op, rs );
 116                 goto cleanup;
 117         }
 118
 119         op->orc_ava = &ava;
 120
 121         Debug( LDAP_DEBUG_ARGS,
 122                 "do_compare: dn (%s) attr (%s) value (%s)\n",
 123                 op->o_req_dn.bv_val,
 124                 ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
 125
 126         op->o_bd = frontendDB;
 127         rs->sr_err = frontendDB->be_compare( op, rs );
 128
 129 cleanup:;
 130         op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 131         op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 132         if ( !BER_BVISNULL( &ava.aa_value ) ) {
 133                 op->o_tmpfree( ava.aa_value.bv_val, op->o_tmpmemctx );
 134         }
 135
 136         return rs->sr_err;
 137 }
 138
 139 int
 140 fe_op_compare( Operation *op, SlapReply *rs )
 141 {
 142         Entry                   *entry = NULL;
 143         AttributeAssertion      *ava = op->orc_ava;
 144         BackendDB               *bd = op->o_bd;
 145
 146         if( strcasecmp( op->o_req_ndn.bv_val, LDAP_ROOT_DSE ) == 0 ) {
 147                 if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
 148                         send_ldap_result( op, rs );
 149                         goto cleanup;
 150                 }
 151
 152                 rs->sr_err = root_dse_info( op->o_conn, &entry, &rs->sr_text );
 153                 if( rs->sr_err != LDAP_SUCCESS ) {
 154                         send_ldap_result( op, rs );
 155                         goto cleanup;
 156                 }
 157
 158         } else if ( bvmatch( &op->o_req_ndn, &frontendDB->be_schemandn ) ) {
 159                 if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
 160                         send_ldap_result( op, rs );
 161                         rs->sr_err = 0;
 162                         goto cleanup;
 163                 }
 164
 165                 rs->sr_err = schema_info( &entry, &rs->sr_text );
 166                 if( rs->sr_err != LDAP_SUCCESS ) {
 167                         send_ldap_result( op, rs );
 168                         rs->sr_err = 0;
 169                         goto cleanup;
 170                 }
 171         }
 172
 173         if( entry ) {
 174                 rs->sr_err = slap_compare_entry( op, entry, ava );
 175                 entry_free( entry );
 176
 177                 send_ldap_result( op, rs );
 178
 179                 if( rs->sr_err == LDAP_COMPARE_TRUE ||
 180                         rs->sr_err == LDAP_COMPARE_FALSE )
 181                 {
 182                         rs->sr_err = LDAP_SUCCESS;
 183                 }
 184
 185                 goto cleanup;
 186         }
 187
 188         /*
 189          * We could be serving multiple database backends.  Select the
 190          * appropriate one, or send a referral to our "referral server"
 191          * if we don't hold it.
 192          */
 193         op->o_bd = select_backend( &op->o_req_ndn, 0 );
 194         if ( op->o_bd == NULL ) {
 195                 rs->sr_ref = referral_rewrite( default_referral,
 196                         NULL, &op->o_req_dn, LDAP_SCOPE_DEFAULT );
 197
 198                 rs->sr_err = LDAP_REFERRAL;
 199                 if (!rs->sr_ref) rs->sr_ref = default_referral;
 200                 op->o_bd = bd;
 201                 send_ldap_result( op, rs );
 202
 203                 if (rs->sr_ref != default_referral) ber_bvarray_free( rs->sr_ref );
 204                 rs->sr_err = 0;
 205                 goto cleanup;
 206         }
 207
 208         /* check restrictions */
 209         if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
 210                 send_ldap_result( op, rs );
 211                 goto cleanup;
 212         }
 213
 214         /* check for referrals */
 215         if( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 216                 goto cleanup;
 217         }
 218
 219         if ( SLAP_SHADOW(op->o_bd) && get_dontUseCopy(op) ) {
 220                 /* don't use shadow copy */
 221                 send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
 222                         "copy not used" );
 223
 224         } else if ( ava->aa_desc == slap_schema.si_ad_entryDN ) {
 225                 send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
 226                         "entryDN compare not supported" );
 227
 228         } else if ( ava->aa_desc == slap_schema.si_ad_subschemaSubentry ) {
 229                 send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
 230                         "subschemaSubentry compare not supported" );
 231
 232 #ifndef SLAP_COMPARE_IN_FRONTEND
 233         } else if ( ava->aa_desc == slap_schema.si_ad_hasSubordinates
 234                 && op->o_bd->be_has_subordinates )
 235         {
 236                 int     rc, hasSubordinates = LDAP_SUCCESS;
 237
 238                 rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, NULL, 0, &entry );
 239                 if ( rc == 0 && entry ) {
 240                         if ( ! access_allowed( op, entry,
 241                                 ava->aa_desc, &ava->aa_value, ACL_COMPARE, NULL ) )
 242                         {
 243                                 rc = rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
 244
 245                         } else {
 246                                 rc = rs->sr_err = op->o_bd->be_has_subordinates( op,
 247                                                 entry, &hasSubordinates );
 248                                 be_entry_release_r( op, entry );
 249                         }
 250                 }
 251
 252                 if ( rc == 0 ) {
 253                         int     asserted;
 254
 255                         asserted = bvmatch( &ava->aa_value, &slap_true_bv )
 256                                 ? LDAP_COMPARE_TRUE : LDAP_COMPARE_FALSE;
 257                         if ( hasSubordinates == asserted ) {
 258                                 rs->sr_err = LDAP_COMPARE_TRUE;
 259
 260                         } else {
 261                                 rs->sr_err = LDAP_COMPARE_FALSE;
 262                         }
 263
 264                 } else {
 265                         /* return error only if "disclose"
 266                          * is granted on the object */
 267                         if ( backend_access( op, NULL, &op->o_req_ndn,
 268                                         slap_schema.si_ad_entry,
 269                                         NULL, ACL_DISCLOSE, NULL ) == LDAP_INSUFFICIENT_ACCESS )
 270                         {
 271                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 272                         }
 273                 }
 274
 275                 send_ldap_result( op, rs );
 276
 277                 if ( rc == 0 ) {
 278                         rs->sr_err = LDAP_SUCCESS;
 279                 }
 280
 281         } else if ( op->o_bd->be_compare ) {
 282                 rs->sr_err = op->o_bd->be_compare( op, rs );
 283
 284 #endif /* ! SLAP_COMPARE_IN_FRONTEND */
 285         } else {
 286                 rs->sr_err = SLAP_CB_CONTINUE;
 287         }
 288
 289         if ( rs->sr_err == SLAP_CB_CONTINUE ) {
 290                 /* do our best to compare that AVA
 291                  *
 292                  * NOTE: this code is used only
 293                  * if SLAP_COMPARE_IN_FRONTEND
 294                  * is #define'd (it's not by default)
 295                  * or if op->o_bd->be_compare is NULL.
 296                  *
 297                  * FIXME: one potential issue is that
 298                  * if SLAP_COMPARE_IN_FRONTEND overlays
 299                  * are not executed for compare. */
 300                 BerVarray       vals = NULL;
 301                 int             rc = LDAP_OTHER;
 302
 303                 rs->sr_err = backend_attribute( op, NULL, &op->o_req_ndn,
 304                                 ava->aa_desc, &vals, ACL_COMPARE );
 305                 switch ( rs->sr_err ) {
 306                 default:
 307                         /* return error only if "disclose"
 308                          * is granted on the object */
 309                         if ( backend_access( op, NULL, &op->o_req_ndn,
 310                                         slap_schema.si_ad_entry,
 311                                         NULL, ACL_DISCLOSE, NULL )
 312                                         == LDAP_INSUFFICIENT_ACCESS )
 313                         {
 314                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 315                         }
 316                         break;
 317
 318                 case LDAP_SUCCESS:
 319                         if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
 320                                 SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
 321                                         SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
 322                                 vals, &ava->aa_value, op->o_tmpmemctx ) == 0 )
 323                         {
 324                                 rs->sr_err = LDAP_COMPARE_TRUE;
 325                                 break;
 326
 327                         } else {
 328                                 rs->sr_err = LDAP_COMPARE_FALSE;
 329                         }
 330                         rc = LDAP_SUCCESS;
 331                         break;
 332                 }
 333
 334                 send_ldap_result( op, rs );
 335
 336                 if ( rc == 0 ) {
 337                         rs->sr_err = LDAP_SUCCESS;
 338                 }
 339
 340                 if ( vals ) {
 341                         ber_bvarray_free_x( vals, op->o_tmpmemctx );
 342                 }
 343         }
 344
 345 cleanup:;
 346         op->o_bd = bd;
 347         return rs->sr_err;
 348 }
 349
 350 int slap_compare_entry(
 351         Operation *op,
 352         Entry *e,
 353         AttributeAssertion *ava )
 354 {
 355         int rc = LDAP_COMPARE_FALSE;
 356         Attribute *a;
 357
 358         if ( ! access_allowed( op, e,
 359                 ava->aa_desc, &ava->aa_value, ACL_COMPARE, NULL ) )
 360         {
 361                 rc = LDAP_INSUFFICIENT_ACCESS;
 362                 goto done;
 363         }
 364
 365         if ( get_assert( op ) &&
 366                 ( test_filter( op, e, get_assertion( op )) != LDAP_COMPARE_TRUE ))
 367         {
 368                 rc = LDAP_ASSERTION_FAILED;
 369                 goto done;
 370         }
 371
 372         a = attrs_find( e->e_attrs, ava->aa_desc );
 373         if( a == NULL ) {
 374                 rc = LDAP_NO_SUCH_ATTRIBUTE;
 375                 goto done;
 376         }
 377
 378         for(;
 379                 a != NULL;
 380                 a = attrs_find( a->a_next, ava->aa_desc ))
 381         {
 382                 if (( ava->aa_desc != a->a_desc ) && ! access_allowed( op,
 383                         e, a->a_desc, &ava->aa_value, ACL_COMPARE, NULL ) )
 384                 {
 385                         rc = LDAP_INSUFFICIENT_ACCESS;
 386                         break;
 387                 }
 388
 389                 if ( attr_valfind( a,
 390                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
 391                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
 392                         &ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
 393                 {
 394                         rc = LDAP_COMPARE_TRUE;
 395                         break;
 396                 }
 397         }
 398
 399 done:
 400         if( rc != LDAP_COMPARE_TRUE && rc != LDAP_COMPARE_FALSE ) {
 401                 if ( ! access_allowed( op, e,
 402                         slap_schema.si_ad_entry, NULL, ACL_DISCLOSE, NULL ) )
 403                 {
 404                         rc = LDAP_NO_SUCH_OBJECT;
 405                 }
 406         }
 407
 408         return rc;
 409 }