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
  34 static int compare_entry(
  35         Operation *op,
  36         Entry *e,
  37         AttributeAssertion *ava );
  38
  39 int
  40 do_compare(
  41     Operation   *op,
  42     SlapReply   *rs )
  43 {
  44         struct berval dn = BER_BVNULL;
  45         struct berval desc = BER_BVNULL;
  46         struct berval value = BER_BVNULL;
  47 #ifdef LDAP_COMP_MATCH
  48         AttributeAssertion ava = { NULL, BER_BVNULL, NULL };
  49 #else
  50         AttributeAssertion ava = { NULL, BER_BVNULL };
  51 #endif
  52
  53         ava.aa_desc = NULL;
  54
  55         Debug( LDAP_DEBUG_TRACE, "do_compare\n", 0, 0, 0 );
  56         /*
  57          * Parse the compare request.  It looks like this:
  58          *
  59          *      CompareRequest := [APPLICATION 14] SEQUENCE {
  60          *              entry   DistinguishedName,
  61          *              ava     SEQUENCE {
  62          *                      type    AttributeType,
  63          *                      value   AttributeValue
  64          *              }
  65          *      }
  66          */
  67
  68         if ( ber_scanf( op->o_ber, "{m" /*}*/, &dn ) == LBER_ERROR ) {
  69                 Debug( LDAP_DEBUG_ANY, "ber_scanf failed\n", 0, 0, 0 );
  70                 send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
  71                 return SLAPD_DISCONNECT;
  72         }
  73
  74         if ( ber_scanf( op->o_ber, "{mm}", &desc, &value ) == LBER_ERROR ) {
  75                 Debug( LDAP_DEBUG_ANY, "do_compare: get ava failed\n", 0, 0, 0 );
  76                 send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
  77                 return SLAPD_DISCONNECT;
  78         }
  79
  80         if ( ber_scanf( op->o_ber, /*{*/ "}" ) == LBER_ERROR ) {
  81                 Debug( LDAP_DEBUG_ANY, "ber_scanf failed\n", 0, 0, 0 );
  82                 send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
  83                 return SLAPD_DISCONNECT;
  84         }
  85
  86         if( get_ctrls( op, rs, 1 ) != LDAP_SUCCESS ) {
  87                 Debug( LDAP_DEBUG_ANY, "do_compare: get_ctrls failed\n", 0, 0, 0 );
  88                 goto cleanup;
  89         }
  90
  91         rs->sr_err = dnPrettyNormal( NULL, &dn, &op->o_req_dn, &op->o_req_ndn,
  92                 op->o_tmpmemctx );
  93         if( rs->sr_err != LDAP_SUCCESS ) {
  94                 Debug( LDAP_DEBUG_ANY,
  95                         "do_compare: invalid dn (%s)\n", dn.bv_val, 0, 0 );
  96                 send_ldap_error( op, rs, LDAP_INVALID_DN_SYNTAX, "invalid DN" );
  97                 goto cleanup;
  98         }
  99
 100         rs->sr_err = slap_bv2ad( &desc, &ava.aa_desc, &rs->sr_text );
 101         if( rs->sr_err != LDAP_SUCCESS ) {
 102                 send_ldap_result( op, rs );
 103                 goto cleanup;
 104         }
 105
 106         rs->sr_err = asserted_value_validate_normalize( ava.aa_desc,
 107                 ava.aa_desc->ad_type->sat_equality,
 108                 SLAP_MR_EQUALITY|SLAP_MR_VALUE_OF_ASSERTION_SYNTAX,
 109                 &value, &ava.aa_value, &rs->sr_text, op->o_tmpmemctx );
 110         if( rs->sr_err != LDAP_SUCCESS ) {
 111                 send_ldap_result( op, rs );
 112                 goto cleanup;
 113         }
 114
 115         op->orc_ava = &ava;
 116
 117         op->o_bd = frontendDB;
 118         rs->sr_err = frontendDB->be_compare( op, rs );
 119
 120 cleanup:;
 121         op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 122         op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 123         if ( !BER_BVISNULL( &ava.aa_value ) ) {
 124                 op->o_tmpfree( ava.aa_value.bv_val, op->o_tmpmemctx );
 125         }
 126
 127         return rs->sr_err;
 128 }
 129
 130 int
 131 fe_op_compare( Operation *op, SlapReply *rs )
 132 {
 133         Entry *entry = NULL;
 134         int manageDSAit;
 135         AttributeAssertion ava = *op->orc_ava;
 136
 137         if( strcasecmp( op->o_req_ndn.bv_val, LDAP_ROOT_DSE ) == 0 ) {
 138                 Debug( LDAP_DEBUG_ARGS,
 139                         "do_compare: dn (%s) attr (%s) value (%s)\n",
 140                         op->o_req_dn.bv_val,
 141                         ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
 142
 143                 Statslog( LDAP_DEBUG_STATS,
 144                         "%s CMP dn=\"%s\" attr=\"%s\"\n",
 145                         op->o_log_prefix, op->o_req_dn.bv_val,
 146                         ava.aa_desc->ad_cname.bv_val, 0, 0 );
 147
 148                 if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
 149                         send_ldap_result( op, rs );
 150                         goto cleanup;
 151                 }
 152
 153                 rs->sr_err = root_dse_info( op->o_conn, &entry, &rs->sr_text );
 154                 if( rs->sr_err != LDAP_SUCCESS ) {
 155                         send_ldap_result( op, rs );
 156                         goto cleanup;
 157                 }
 158
 159         } else if ( bvmatch( &op->o_req_ndn, &frontendDB->be_schemandn ) ) {
 160                 Debug( LDAP_DEBUG_ARGS, "do_compare: dn (%s) attr (%s) value (%s)\n",
 161                         op->o_req_dn.bv_val,
 162                         ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
 163
 164                 Statslog( LDAP_DEBUG_STATS,
 165                         "%s CMP dn=\"%s\" attr=\"%s\"\n",
 166                         op->o_log_prefix, op->o_req_dn.bv_val,
 167                         ava.aa_desc->ad_cname.bv_val, 0, 0 );
 168
 169                 if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
 170                         send_ldap_result( op, rs );
 171                         rs->sr_err = 0;
 172                         goto cleanup;
 173                 }
 174
 175                 rs->sr_err = schema_info( &entry, &rs->sr_text );
 176                 if( rs->sr_err != LDAP_SUCCESS ) {
 177                         send_ldap_result( op, rs );
 178                         rs->sr_err = 0;
 179                         goto cleanup;
 180                 }
 181         }
 182
 183         if( entry ) {
 184                 rs->sr_err = compare_entry( op, entry, &ava );
 185                 entry_free( entry );
 186
 187                 send_ldap_result( op, rs );
 188
 189                 if( rs->sr_err == LDAP_COMPARE_TRUE ||
 190                         rs->sr_err == LDAP_COMPARE_FALSE )
 191                 {
 192                         rs->sr_err = LDAP_SUCCESS;
 193                 }
 194
 195                 goto cleanup;
 196         }
 197
 198         manageDSAit = get_manageDSAit( op );
 199
 200         /*
 201          * We could be serving multiple database backends.  Select the
 202          * appropriate one, or send a referral to our "referral server"
 203          * if we don't hold it.
 204          */
 205         op->o_bd = select_backend( &op->o_req_ndn, manageDSAit, 0 );
 206         if ( op->o_bd == NULL ) {
 207                 rs->sr_ref = referral_rewrite( default_referral,
 208                         NULL, &op->o_req_dn, LDAP_SCOPE_DEFAULT );
 209
 210                 rs->sr_err = LDAP_REFERRAL;
 211                 if (!rs->sr_ref) rs->sr_ref = default_referral;
 212                 op->o_bd = frontendDB;
 213                 send_ldap_result( op, rs );
 214                 op->o_bd = NULL;
 215
 216                 if (rs->sr_ref != default_referral) ber_bvarray_free( rs->sr_ref );
 217                 rs->sr_err = 0;
 218                 goto cleanup;
 219         }
 220
 221         /* check restrictions */
 222         if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
 223                 send_ldap_result( op, rs );
 224                 goto cleanup;
 225         }
 226
 227         /* check for referrals */
 228         if( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 229                 goto cleanup;
 230         }
 231
 232         Debug( LDAP_DEBUG_ARGS, "do_compare: dn (%s) attr (%s) value (%s)\n",
 233             op->o_req_dn.bv_val,
 234                 ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
 235
 236         Statslog( LDAP_DEBUG_STATS, "%s CMP dn=\"%s\" attr=\"%s\"\n",
 237                 op->o_log_prefix, op->o_req_dn.bv_val,
 238                 ava.aa_desc->ad_cname.bv_val, 0, 0 );
 239
 240         op->orc_ava = &ava;
 241         if ( ava.aa_desc == slap_schema.si_ad_entryDN ) {
 242                 send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
 243                         "entryDN compare not supported" );
 244
 245         } else if ( ava.aa_desc == slap_schema.si_ad_subschemaSubentry ) {
 246                 send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
 247                         "subschemaSubentry compare not supported" );
 248
 249 #ifndef SLAP_COMPARE_IN_FRONTEND
 250         } else if ( ava.aa_desc == slap_schema.si_ad_hasSubordinates
 251                 && op->o_bd->be_has_subordinates )
 252         {
 253                 int     rc, hasSubordinates = LDAP_SUCCESS;
 254
 255                 rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, NULL, 0, &entry );
 256                 if ( rc == 0 && entry ) {
 257                         if ( ! access_allowed( op, entry,
 258                                 ava.aa_desc, &ava.aa_value, ACL_COMPARE, NULL ) )
 259                         {
 260                                 rc = rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
 261
 262                         } else {
 263                                 rc = rs->sr_err = op->o_bd->be_has_subordinates( op,
 264                                                 entry, &hasSubordinates );
 265                                 be_entry_release_r( op, entry );
 266                         }
 267                 }
 268
 269                 if ( rc == 0 ) {
 270                         int     asserted;
 271
 272                         asserted = bvmatch( &ava.aa_value, &slap_true_bv )
 273                                 ? LDAP_COMPARE_TRUE : LDAP_COMPARE_FALSE;
 274                         if ( hasSubordinates == asserted ) {
 275                                 rs->sr_err = LDAP_COMPARE_TRUE;
 276
 277                         } else {
 278                                 rs->sr_err = LDAP_COMPARE_FALSE;
 279                         }
 280
 281                 } else {
 282 #ifdef SLAP_ACL_HONOR_DISCLOSE
 283                         /* return error only if "disclose"
 284                          * is granted on the object */
 285                         if ( backend_access( op, NULL, &op->o_req_ndn,
 286                                         slap_schema.si_ad_entry,
 287                                         NULL, ACL_DISCLOSE, NULL ) == LDAP_INSUFFICIENT_ACCESS )
 288                         {
 289                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 290                         }
 291 #endif /* SLAP_ACL_HONOR_DISCLOSE */
 292                 }
 293
 294                 send_ldap_result( op, rs );
 295
 296                 if ( rc == 0 ) {
 297                         rs->sr_err = LDAP_SUCCESS;
 298                 }
 299
 300         } else if ( op->o_bd->be_compare ) {
 301                 rs->sr_err = op->o_bd->be_compare( op, rs );
 302
 303 #endif /* ! SLAP_COMPARE_IN_FRONTEND */
 304         } else {
 305                 rs->sr_err = SLAP_CB_CONTINUE;
 306         }
 307
 308         if ( rs->sr_err == SLAP_CB_CONTINUE ) {
 309                 /* do our best to compare that AVA
 310                  *
 311                  * NOTE: this code is used only
 312                  * if SLAP_COMPARE_IN_FRONTEND
 313                  * is #define'd (it's not by default)
 314                  * or if op->o_bd->be_compare is NULL.
 315                  *
 316                  * FIXME: one potential issue is that
 317                  * if SLAP_COMPARE_IN_FRONTEND overlays
 318                  * are not executed for compare. */
 319                 BerVarray       vals = NULL;
 320                 int             rc = LDAP_OTHER;
 321
 322                 rs->sr_err = backend_attribute( op, NULL, &op->o_req_ndn,
 323                                 ava.aa_desc, &vals, ACL_COMPARE );
 324                 switch ( rs->sr_err ) {
 325                 default:
 326 #ifdef SLAP_ACL_HONOR_DISCLOSE
 327                         /* return error only if "disclose"
 328                          * is granted on the object */
 329                         if ( backend_access( op, NULL, &op->o_req_ndn,
 330                                         slap_schema.si_ad_entry,
 331                                         NULL, ACL_DISCLOSE, NULL )
 332                                         == LDAP_INSUFFICIENT_ACCESS )
 333                         {
 334                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
 335                         }
 336 #endif /* SLAP_ACL_HONOR_DISCLOSE */
 337                         break;
 338
 339                 case LDAP_SUCCESS:
 340                         if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
 341                                 SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
 342                                         SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
 343                                 vals, &ava.aa_value, op->o_tmpmemctx ) == 0 )
 344                         {
 345                                 rs->sr_err = LDAP_COMPARE_TRUE;
 346                                 break;
 347
 348                         } else {
 349                                 rs->sr_err = LDAP_COMPARE_FALSE;
 350                         }
 351                         rc = LDAP_SUCCESS;
 352                         break;
 353                 }
 354
 355                 send_ldap_result( op, rs );
 356
 357                 if ( rc == 0 ) {
 358                         rs->sr_err = LDAP_SUCCESS;
 359                 }
 360
 361                 if ( vals ) {
 362                         ber_bvarray_free_x( vals, op->o_tmpmemctx );
 363                 }
 364         }
 365
 366 cleanup:;
 367         return rs->sr_err;
 368 }
 369
 370 static int compare_entry(
 371         Operation *op,
 372         Entry *e,
 373         AttributeAssertion *ava )
 374 {
 375         int rc = LDAP_COMPARE_FALSE;
 376         Attribute *a;
 377
 378         if ( ! access_allowed( op, e,
 379                 ava->aa_desc, &ava->aa_value, ACL_COMPARE, NULL ) )
 380         {
 381                 rc = LDAP_INSUFFICIENT_ACCESS;
 382                 goto done;
 383         }
 384
 385         a = attrs_find( e->e_attrs, ava->aa_desc );
 386         if( a == NULL ) {
 387                 rc = LDAP_NO_SUCH_ATTRIBUTE;
 388                 goto done;
 389         }
 390
 391         for(a = attrs_find( e->e_attrs, ava->aa_desc );
 392                 a != NULL;
 393                 a = attrs_find( a->a_next, ava->aa_desc ))
 394         {
 395                 if (( ava->aa_desc != a->a_desc ) && ! access_allowed( op,
 396                         e, a->a_desc, &ava->aa_value, ACL_COMPARE, NULL ) )
 397                 {
 398                         rc = LDAP_INSUFFICIENT_ACCESS;
 399                         break;
 400                 }
 401
 402                 if ( value_find_ex( ava->aa_desc,
 403                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
 404                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
 405                         a->a_nvals, &ava->aa_value, op->o_tmpmemctx ) == 0 )
 406                 {
 407                         rc = LDAP_COMPARE_TRUE;
 408                         break;
 409                 }
 410         }
 411
 412 done:
 413 #ifdef LDAP_ACL_HONOR_DISCLOSE
 414         if( rc != LDAP_COMPARE_TRUE && rc != LDAP_COMPARE_FALSE ) {
 415                 if ( ! access_allowed( op, e,
 416                         slap_schema.si_ad_entry, NULL, ACL_DISCLOSE, NULL ) )
 417                 {
 418                         rc = LDAP_NO_SUCH_OBJECT;
 419                 }
 420         }
 421 #endif
 422
 423         return rc;
 424 }