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 1998-2005 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 #ifdef LDAP_SLAPI
  34 #include "slapi/slapi.h"
  35 #endif
  36
  37 static int compare_entry(
  38         Operation *op,
  39         Entry *e,
  40         AttributeAssertion *ava );
  41
  42 int
  43 do_compare(
  44     Operation   *op,
  45     SlapReply   *rs )
  46 {
  47         struct berval dn = BER_BVNULL;
  48         struct berval desc = BER_BVNULL;
  49         struct berval value = BER_BVNULL;
  50         AttributeAssertion ava = { NULL, BER_BVNULL, NULL };
  51
  52         ava.aa_desc = NULL;
  53
  54         Debug( LDAP_DEBUG_TRACE, "do_compare\n", 0, 0, 0 );
  55         /*
  56          * Parse the compare request.  It looks like this:
  57          *
  58          *      CompareRequest := [APPLICATION 14] SEQUENCE {
  59          *              entry   DistinguishedName,
  60          *              ava     SEQUENCE {
  61          *                      type    AttributeType,
  62          *                      value   AttributeValue
  63          *              }
  64          *      }
  65          */
  66
  67         if ( ber_scanf( op->o_ber, "{m" /*}*/, &dn ) == LBER_ERROR ) {
  68                 Debug( LDAP_DEBUG_ANY, "ber_scanf failed\n", 0, 0, 0 );
  69                 send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
  70                 return SLAPD_DISCONNECT;
  71         }
  72
  73         if ( ber_scanf( op->o_ber, "{mm}", &desc, &value ) == LBER_ERROR ) {
  74                 Debug( LDAP_DEBUG_ANY, "do_compare: get ava failed\n", 0, 0, 0 );
  75                 send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
  76                 return SLAPD_DISCONNECT;
  77         }
  78
  79         if ( ber_scanf( op->o_ber, /*{*/ "}" ) == LBER_ERROR ) {
  80                 Debug( LDAP_DEBUG_ANY, "ber_scanf failed\n", 0, 0, 0 );
  81                 send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
  82                 return SLAPD_DISCONNECT;
  83         }
  84
  85         if( get_ctrls( op, rs, 1 ) != LDAP_SUCCESS ) {
  86                 Debug( LDAP_DEBUG_ANY, "do_compare: get_ctrls failed\n", 0, 0, 0 );
  87                 goto cleanup;
  88         }
  89
  90         rs->sr_err = dnPrettyNormal( NULL, &dn, &op->o_req_dn, &op->o_req_ndn,
  91                 op->o_tmpmemctx );
  92         if( rs->sr_err != LDAP_SUCCESS ) {
  93                 Debug( LDAP_DEBUG_ANY,
  94                         "do_compare: invalid dn (%s)\n", dn.bv_val, 0, 0 );
  95                 send_ldap_error( op, rs, LDAP_INVALID_DN_SYNTAX, "invalid DN" );
  96                 goto cleanup;
  97         }
  98
  99         rs->sr_err = slap_bv2ad( &desc, &ava.aa_desc, &rs->sr_text );
 100         if( rs->sr_err != LDAP_SUCCESS ) {
 101                 send_ldap_result( op, rs );
 102                 goto cleanup;
 103         }
 104
 105         rs->sr_err = asserted_value_validate_normalize( ava.aa_desc,
 106                 ava.aa_desc->ad_type->sat_equality,
 107                 SLAP_MR_EQUALITY|SLAP_MR_VALUE_OF_ASSERTION_SYNTAX,
 108                 &value, &ava.aa_value, &rs->sr_text, op->o_tmpmemctx );
 109         if( rs->sr_err != LDAP_SUCCESS ) {
 110                 send_ldap_result( op, rs );
 111                 goto cleanup;
 112         }
 113
 114         op->orc_ava = &ava;
 115
 116         op->o_bd = frontendDB;
 117         rs->sr_err = frontendDB->be_compare( op, rs );
 118
 119 cleanup:;
 120         op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 121         op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 122         if ( ava.aa_value.bv_val ) {
 123                 op->o_tmpfree( ava.aa_value.bv_val, op->o_tmpmemctx );
 124         }
 125
 126         return rs->sr_err;
 127 }
 128
 129 int
 130 fe_op_compare( Operation *op, SlapReply *rs )
 131 {
 132         Entry *entry = NULL;
 133         int manageDSAit;
 134         AttributeAssertion ava = *op->orc_ava;
 135
 136         if( strcasecmp( op->o_req_ndn.bv_val, LDAP_ROOT_DSE ) == 0 ) {
 137                 Debug( LDAP_DEBUG_ARGS,
 138                         "do_compare: dn (%s) attr (%s) value (%s)\n",
 139                         op->o_req_dn.bv_val,
 140                         ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
 141
 142                 Statslog( LDAP_DEBUG_STATS,
 143                         "%s CMP dn=\"%s\" attr=\"%s\"\n",
 144                         op->o_log_prefix, op->o_req_dn.bv_val,
 145                         ava.aa_desc->ad_cname.bv_val, 0, 0 );
 146
 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                 Debug( LDAP_DEBUG_ARGS, "do_compare: dn (%s) attr (%s) value (%s)\n",
 160                         op->o_req_dn.bv_val,
 161                         ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
 162
 163                 Statslog( LDAP_DEBUG_STATS,
 164                         "%s CMP dn=\"%s\" attr=\"%s\"\n",
 165                         op->o_log_prefix, op->o_req_dn.bv_val,
 166                         ava.aa_desc->ad_cname.bv_val, 0, 0 );
 167
 168                 if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
 169                         send_ldap_result( op, rs );
 170                         rs->sr_err = 0;
 171                         goto cleanup;
 172                 }
 173
 174                 rs->sr_err = schema_info( &entry, &rs->sr_text );
 175                 if( rs->sr_err != LDAP_SUCCESS ) {
 176                         send_ldap_result( op, rs );
 177                         rs->sr_err = 0;
 178                         goto cleanup;
 179                 }
 180         }
 181
 182         if( entry ) {
 183                 rs->sr_err = compare_entry( op, entry, &ava );
 184                 entry_free( entry );
 185
 186                 send_ldap_result( op, rs );
 187
 188                 if( rs->sr_err == LDAP_COMPARE_TRUE ||
 189                         rs->sr_err == LDAP_COMPARE_FALSE )
 190                 {
 191                         rs->sr_err = LDAP_SUCCESS;
 192                 }
 193
 194                 goto cleanup;
 195         }
 196
 197         manageDSAit = get_manageDSAit( op );
 198
 199         /*
 200          * We could be serving multiple database backends.  Select the
 201          * appropriate one, or send a referral to our "referral server"
 202          * if we don't hold it.
 203          */
 204         op->o_bd = select_backend( &op->o_req_ndn, manageDSAit, 0 );
 205         if ( op->o_bd == NULL ) {
 206                 rs->sr_ref = referral_rewrite( default_referral,
 207                         NULL, &op->o_req_dn, LDAP_SCOPE_DEFAULT );
 208
 209                 rs->sr_err = LDAP_REFERRAL;
 210                 if (!rs->sr_ref) rs->sr_ref = default_referral;
 211                 op->o_bd = frontendDB;
 212                 send_ldap_result( op, rs );
 213                 op->o_bd = NULL;
 214
 215                 if (rs->sr_ref != default_referral) ber_bvarray_free( rs->sr_ref );
 216                 rs->sr_err = 0;
 217                 goto cleanup;
 218         }
 219
 220         /* check restrictions */
 221         if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
 222                 send_ldap_result( op, rs );
 223                 goto cleanup;
 224         }
 225
 226         /* check for referrals */
 227         if( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 228                 goto cleanup;
 229         }
 230
 231         Debug( LDAP_DEBUG_ARGS, "do_compare: dn (%s) attr (%s) value (%s)\n",
 232             op->o_req_dn.bv_val,
 233                 ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
 234
 235         Statslog( LDAP_DEBUG_STATS, "%s CMP dn=\"%s\" attr=\"%s\"\n",
 236                 op->o_log_prefix, op->o_req_dn.bv_val,
 237                 ava.aa_desc->ad_cname.bv_val, 0, 0 );
 238
 239 #if defined( LDAP_SLAPI )
 240 #define pb      op->o_pb
 241         if ( pb ) {
 242                 slapi_int_pblock_set_operation( pb, op );
 243                 slapi_pblock_set( pb, SLAPI_COMPARE_TARGET, (void *)op->o_req_dn.bv_val );
 244                 slapi_pblock_set( pb, SLAPI_MANAGEDSAIT, (void *)manageDSAit );
 245                 slapi_pblock_set( pb, SLAPI_COMPARE_TYPE, (void *)ava.aa_desc->ad_cname.bv_val );
 246                 slapi_pblock_set( pb, SLAPI_COMPARE_VALUE, (void *)&ava.aa_value );
 247
 248                 rs->sr_err = slapi_int_call_plugins( op->o_bd,
 249                         SLAPI_PLUGIN_PRE_COMPARE_FN, pb );
 250                 if ( rs->sr_err < 0 ) {
 251                         /*
 252                          * A preoperation plugin failure will abort the
 253                          * entire operation.
 254                          */
 255                         Debug(LDAP_DEBUG_TRACE,
 256                                 "do_compare: compare preoperation plugin failed\n",
 257                                 0, 0, 0);
 258                         if ( ( slapi_pblock_get( op->o_pb, SLAPI_RESULT_CODE,
 259                                 (void *)&rs->sr_err ) != 0 ) || rs->sr_err == LDAP_SUCCESS )
 260                         {
 261                                 rs->sr_err = LDAP_OTHER;
 262                         }
 263                         goto cleanup;
 264                 }
 265         }
 266 #endif /* defined( LDAP_SLAPI ) */
 267
 268         op->orc_ava = &ava;
 269         if ( ava.aa_desc == slap_schema.si_ad_entryDN ) {
 270                 send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
 271                         "entryDN compare not supported" );
 272
 273         } else if ( ava.aa_desc == slap_schema.si_ad_subschemaSubentry ) {
 274                 send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
 275                         "subschemaSubentry compare not supported" );
 276
 277 #ifndef SLAP_COMPARE_IN_FRONTEND
 278         } else if ( ava.aa_desc == slap_schema.si_ad_hasSubordinates
 279                 && op->o_bd->be_has_subordinates )
 280         {
 281                 int     rc, hasSubordinates = LDAP_SUCCESS;
 282
 283                 rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, NULL, 0, &entry );
 284                 if ( rc == 0 && entry ) {
 285                         if ( ! access_allowed( op, entry,
 286                                 ava.aa_desc, &ava.aa_value, ACL_COMPARE, NULL ) )
 287                         {
 288                                 rc = rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
 289
 290                         } else {
 291                                 rc = rs->sr_err = op->o_bd->be_has_subordinates( op,
 292                                                 entry, &hasSubordinates );
 293                                 be_entry_release_r( op, entry );
 294                         }
 295                 }
 296
 297                 if ( rc == 0 ) {
 298                         int     asserted;
 299
 300                         asserted = bvmatch( &ava.aa_value, &slap_true_bv )
 301                                 ? LDAP_COMPARE_TRUE : LDAP_COMPARE_FALSE;
 302                         if ( hasSubordinates == asserted ) {
 303                                 rs->sr_err = LDAP_COMPARE_TRUE;
 304
 305                         } else {
 306                                 rs->sr_err = LDAP_COMPARE_FALSE;
 307                         }
 308
 309                 } else {
 310 #ifdef SLAP_ACL_HONOR_DISCLOSE
 311                         /* return error only if "disclose"
 312                          * is granted on the object */
 313                         if ( backend_access( op, NULL, &op->o_req_ndn,
 314                                         slap_schema.si_ad_entry,
 315                                         NULL, ACL_DISCLOSE, NULL ) == LDAP_INSUFFICIENT_ACCESS )
 316                         {
 317                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 318                         }
 319 #endif /* SLAP_ACL_HONOR_DISCLOSE */
 320                 }
 321
 322                 send_ldap_result( op, rs );
 323
 324                 if ( rc == 0 ) {
 325                         rs->sr_err = LDAP_SUCCESS;
 326                 }
 327
 328         } else if ( op->o_bd->be_compare ) {
 329                 rs->sr_err = op->o_bd->be_compare( op, rs );
 330
 331 #endif /* ! SLAP_COMPARE_IN_FRONTEND */
 332         } else {
 333                 rs->sr_err = SLAP_CB_CONTINUE;
 334         }
 335
 336         if ( rs->sr_err == SLAP_CB_CONTINUE ) {
 337                 /* do our best to compare that AVA
 338                  *
 339                  * NOTE: this code is used only
 340                  * if SLAP_COMPARE_IN_FRONTEND
 341                  * is #define'd (it's not by default)
 342                  * or if op->o_bd->be_compare is NULL.
 343                  *
 344                  * FIXME: one potential issue is that
 345                  * if SLAP_COMPARE_IN_FRONTEND overlays
 346                  * are not executed for compare. */
 347                 BerVarray       vals = NULL;
 348                 int             rc = LDAP_OTHER;
 349
 350                 rs->sr_err = backend_attribute( op, NULL, &op->o_req_ndn,
 351                                 ava.aa_desc, &vals, ACL_COMPARE );
 352                 switch ( rs->sr_err ) {
 353                 default:
 354 #ifdef SLAP_ACL_HONOR_DISCLOSE
 355                         /* return error only if "disclose"
 356                          * is granted on the object */
 357                         if ( backend_access( op, NULL, &op->o_req_ndn,
 358                                         slap_schema.si_ad_entry,
 359                                         NULL, ACL_DISCLOSE, NULL )
 360                                         == LDAP_INSUFFICIENT_ACCESS )
 361                         {
 362                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 363                         }
 364 #endif /* SLAP_ACL_HONOR_DISCLOSE */
 365                         break;
 366
 367                 case LDAP_SUCCESS:
 368                         if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
 369                                 SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
 370                                         SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
 371                                 vals, &ava.aa_value, op->o_tmpmemctx ) == 0 )
 372                         {
 373                                 rs->sr_err = LDAP_COMPARE_TRUE;
 374                                 break;
 375
 376                         } else {
 377                                 rs->sr_err = LDAP_COMPARE_FALSE;
 378                         }
 379                         rc = LDAP_SUCCESS;
 380                         break;
 381                 }
 382
 383                 send_ldap_result( op, rs );
 384
 385                 if ( rc == 0 ) {
 386                         rs->sr_err = LDAP_SUCCESS;
 387                 }
 388
 389                 if ( vals ) {
 390                         ber_bvarray_free_x( vals, op->o_tmpmemctx );
 391                 }
 392         }
 393
 394 #if defined( LDAP_SLAPI )
 395         if ( pb != NULL && slapi_int_call_plugins( op->o_bd,
 396                 SLAPI_PLUGIN_POST_COMPARE_FN, pb ) < 0 )
 397         {
 398                 Debug(LDAP_DEBUG_TRACE,
 399                         "do_compare: compare postoperation plugins failed\n", 0, 0, 0 );
 400         }
 401 #endif /* defined( LDAP_SLAPI ) */
 402
 403 cleanup:;
 404         return rs->sr_err;
 405 }
 406
 407 static int compare_entry(
 408         Operation *op,
 409         Entry *e,
 410         AttributeAssertion *ava )
 411 {
 412         int rc;
 413         Attribute *a;
 414
 415         if ( ! access_allowed( op, e,
 416                 ava->aa_desc, &ava->aa_value, ACL_COMPARE, NULL ) )
 417         {
 418                 return LDAP_INSUFFICIENT_ACCESS;
 419         }
 420
 421         a = attrs_find( e->e_attrs, ava->aa_desc );
 422         if( a == NULL ) return LDAP_NO_SUCH_ATTRIBUTE;
 423
 424         rc = LDAP_COMPARE_FALSE;
 425         for(a = attrs_find( e->e_attrs, ava->aa_desc );
 426                 a != NULL;
 427                 a = attrs_find( a->a_next, ava->aa_desc ))
 428         {
 429                 if (( ava->aa_desc != a->a_desc ) && ! access_allowed( op,
 430                         e, a->a_desc, &ava->aa_value, ACL_COMPARE, NULL ) )
 431                 {
 432                         rc = LDAP_INSUFFICIENT_ACCESS;
 433                         break;
 434                 }
 435
 436                 if ( value_find_ex( ava->aa_desc,
 437                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
 438                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
 439                         a->a_nvals,
 440                         &ava->aa_value, op->o_tmpmemctx ) == 0 )
 441                 {
 442                         rc = LDAP_COMPARE_TRUE;
 443                         break;
 444                 }
 445         }
 446
 447         return rc;
 448 }