git.sur5r.net Git - openldap/blob - servers/slapd/back-ldap/bind.c

   1 /* bind.c - ldap backend bind function */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 1999-2004 The OpenLDAP Foundation.
   6  * Portions Copyright 2000-2003 Pierangelo Masarati.
   7  * Portions Copyright 1999-2003 Howard Chu.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted only as authorized by the OpenLDAP
  12  * Public License.
  13  *
  14  * A copy of this license is available in the file LICENSE in the
  15  * top-level directory of the distribution or, alternatively, at
  16  * <http://www.OpenLDAP.org/license.html>.
  17  */
  18 /* ACKNOWLEDGEMENTS:
  19  * This work was initially developed by the Howard Chu for inclusion
  20  * in OpenLDAP Software and subsequently enhanced by Pierangelo
  21  * Masarati.
  22  */
  23
  24 #include "portable.h"
  25
  26 #include <stdio.h>
  27
  28 #include <ac/socket.h>
  29 #include <ac/string.h>
  30
  31 #define AVL_INTERNAL
  32 #include "slap.h"
  33 #include "back-ldap.h"
  34
  35 #include <lutil_ldap.h>
  36
  37 #define PRINT_CONNTREE 0
  38
  39 static LDAP_REBIND_PROC ldap_back_rebind;
  40
  41 int
  42 ldap_back_bind(
  43     Operation           *op,
  44     SlapReply           *rs )
  45 {
  46         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
  47         struct ldapconn *lc;
  48
  49         struct berval mdn = BER_BVNULL;
  50         int rc = 0;
  51         ber_int_t msgid;
  52         dncookie dc;
  53
  54         lc = ldap_back_getconn(op, rs);
  55         if ( !lc ) {
  56                 return( -1 );
  57         }
  58
  59         /*
  60          * Rewrite the bind dn if needed
  61          */
  62         dc.rwmap = &li->rwmap;
  63 #ifdef ENABLE_REWRITE
  64         dc.conn = op->o_conn;
  65         dc.rs = rs;
  66         dc.ctx = "bindDN";
  67 #else
  68         dc.tofrom = 1;
  69         dc.normalized = 0;
  70 #endif
  71         if ( ldap_back_dn_massage( &dc, &op->o_req_dn, &mdn ) ) {
  72                 send_ldap_result( op, rs );
  73                 return -1;
  74         }
  75
  76         if ( !BER_BVISNULL( &lc->bound_dn ) ) {
  77                 ch_free( lc->bound_dn.bv_val );
  78                 BER_BVZERO( &lc->bound_dn );
  79         }
  80         lc->bound = 0;
  81         /* method is always LDAP_AUTH_SIMPLE if we got here */
  82         rs->sr_err = ldap_sasl_bind(lc->ld, mdn.bv_val, LDAP_SASL_SIMPLE,
  83                 &op->oq_bind.rb_cred, op->o_ctrls, NULL, &msgid);
  84         rc = ldap_back_op_result( lc, op, rs, msgid, 1 );
  85         if (rc == LDAP_SUCCESS) {
  86                 lc->bound = 1;
  87                 if ( mdn.bv_val != op->o_req_dn.bv_val ) {
  88                         lc->bound_dn = mdn;
  89                 } else {
  90                         ber_dupbv( &lc->bound_dn, &op->o_req_dn );
  91                 }
  92                 BER_BVZERO( &mdn );
  93
  94                 if ( li->savecred ) {
  95                         if ( !BER_BVISNULL( &lc->cred ) ) {
  96                                 memset( lc->cred.bv_val, 0, lc->cred.bv_len );
  97                                 ch_free( lc->cred.bv_val );
  98                         }
  99                         ber_dupbv( &lc->cred, &op->oq_bind.rb_cred );
 100                         ldap_set_rebind_proc( lc->ld, ldap_back_rebind, lc );
 101                 }
 102         }
 103
 104         /* must re-insert if local DN changed as result of bind */
 105         if ( lc->bound && !bvmatch(&op->o_req_ndn, &lc->local_dn ) ) {
 106                 int lerr;
 107
 108                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 109                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 110                                 ldap_back_conn_cmp );
 111                 if ( !BER_BVISNULL( &lc->local_dn ) )
 112                         ch_free( lc->local_dn.bv_val );
 113                 ber_dupbv( &lc->local_dn, &op->o_req_ndn );
 114                 lerr = avl_insert( &li->conntree, (caddr_t)lc,
 115                         ldap_back_conn_cmp, ldap_back_conn_dup );
 116                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 117                 if ( lerr == -1 ) {
 118                         ldap_back_conn_free( lc );
 119                 }
 120         }
 121
 122         if ( !BER_BVISNULL( &mdn ) && mdn.bv_val != op->o_req_dn.bv_val ) {
 123                 free( mdn.bv_val );
 124         }
 125
 126         return( rc );
 127 }
 128
 129 /*
 130  * ldap_back_conn_cmp
 131  *
 132  * compares two struct ldapconn based on the value of the conn pointer;
 133  * used by avl stuff
 134  */
 135 int
 136 ldap_back_conn_cmp(
 137         const void *c1,
 138         const void *c2
 139         )
 140 {
 141         const struct ldapconn *lc1 = (const struct ldapconn *)c1;
 142         const struct ldapconn *lc2 = (const struct ldapconn *)c2;
 143         int rc;
 144
 145         /* If local DNs don't match, it is definitely not a match */
 146         if ( ( rc = ber_bvcmp( &lc1->local_dn, &lc2->local_dn )) )
 147                 return rc;
 148
 149         /* For shared sessions, conn is NULL. Only explicitly
 150          * bound sessions will have non-NULL conn.
 151          */
 152         return SLAP_PTRCMP(lc1->conn, lc2->conn);
 153 }
 154
 155 /*
 156  * ldap_back_conn_dup
 157  *
 158  * returns -1 in case a duplicate struct ldapconn has been inserted;
 159  * used by avl stuff
 160  */
 161 int
 162 ldap_back_conn_dup(
 163         void *c1,
 164         void *c2
 165         )
 166 {
 167         struct ldapconn *lc1 = (struct ldapconn *)c1;
 168         struct ldapconn *lc2 = (struct ldapconn *)c2;
 169
 170         /* Cannot have more than one shared session with same DN */
 171         if ( dn_match( &lc1->local_dn, &lc2->local_dn ) &&
 172                  lc1->conn == lc2->conn ) return -1;
 173
 174         return 0;
 175 }
 176
 177 #if PRINT_CONNTREE > 0
 178 static void ravl_print( Avlnode *root, int depth )
 179 {
 180         int     i;
 181         struct ldapconn *lc;
 182
 183         if ( root == 0 )
 184                 return;
 185
 186         ravl_print( root->avl_right, depth+1 );
 187
 188         for ( i = 0; i < depth; i++ )
 189                 printf( "   " );
 190
 191         lc = root->avl_data;
 192         printf( "lc(%lx) local(%s) conn(%lx) %d\n",
 193                         lc, lc->local_dn.bv_val, lc->conn, root->avl_bf );
 194
 195         ravl_print( root->avl_left, depth+1 );
 196 }
 197
 198 static void myprint( Avlnode *root )
 199 {
 200         printf( "********\n" );
 201
 202         if ( root == 0 )
 203                 printf( "\tNULL\n" );
 204
 205         else
 206                 ravl_print( root, 0 );
 207
 208         printf( "********\n" );
 209 }
 210 #endif /* PRINT_CONNTREE */
 211
 212 struct ldapconn *
 213 ldap_back_getconn(Operation *op, SlapReply *rs)
 214 {
 215         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 216         struct ldapconn *lc, lc_curr;
 217         LDAP *ld;
 218         int is_priv = 0;
 219
 220         /* Searches for a ldapconn in the avl tree */
 221
 222         /* Explicit binds must not be shared */
 223         if ( op->o_tag == LDAP_REQ_BIND
 224                 || (op->o_conn
 225                   && (op->o_bd == op->o_conn->c_authz_backend ))) {
 226                 lc_curr.conn = op->o_conn;
 227
 228         } else {
 229                 lc_curr.conn = NULL;
 230         }
 231
 232         /* Internal searches are privileged and shared. So is root. */
 233         if ( op->o_do_not_cache || be_isroot( op ) ) {
 234                 lc_curr.local_dn = op->o_bd->be_rootndn;
 235                 lc_curr.conn = NULL;
 236                 is_priv = 1;
 237
 238         } else {
 239                 lc_curr.local_dn = op->o_ndn;
 240         }
 241
 242         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 243         lc = (struct ldapconn *)avl_find( li->conntree,
 244                 (caddr_t)&lc_curr, ldap_back_conn_cmp );
 245         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 246
 247         /* Looks like we didn't get a bind. Open a new session... */
 248         if (!lc) {
 249                 int vers = op->o_protocol;
 250                 rs->sr_err = ldap_initialize(&ld, li->url);
 251
 252                 if (rs->sr_err != LDAP_SUCCESS) {
 253                         rs->sr_err = slap_map_api2result( rs );
 254                         if (rs->sr_text == NULL) {
 255                                 rs->sr_text = "ldap_initialize() failed";
 256                         }
 257                         if (op->o_conn) send_ldap_result( op, rs );
 258                         rs->sr_text = NULL;
 259                         return( NULL );
 260                 }
 261                 /* Set LDAP version. This will always succeed: If the client
 262                  * bound with a particular version, then so can we.
 263                  */
 264                 ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION,
 265                                 (const void *)&vers);
 266                 /* FIXME: configurable? */
 267                 ldap_set_option(ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON);
 268
 269                 lc = (struct ldapconn *)ch_malloc(sizeof(struct ldapconn));
 270                 lc->conn = lc_curr.conn;
 271                 lc->ld = ld;
 272                 ber_dupbv( &lc->local_dn, &lc_curr.local_dn );
 273
 274 #ifdef ENABLE_REWRITE
 275                 /*
 276                  * Sets a cookie for the rewrite session
 277                  *
 278                  * FIXME: the o_conn might be no longer valid,
 279                  * since we may have different entries
 280                  * for the same connection
 281                  */
 282                 ( void )rewrite_session_init( li->rwmap.rwm_rw, op->o_conn );
 283 #endif /* ENABLE_REWRITE */
 284
 285                 ldap_pvt_thread_mutex_init( &lc->lc_mutex );
 286
 287                 if ( is_priv ) {
 288                         ber_dupbv( &lc->cred, &li->acl_passwd );
 289                         ber_dupbv( &lc->bound_dn, &li->acl_authcDN );
 290
 291                 } else {
 292                         BER_BVZERO( &lc->cred );
 293                         BER_BVZERO( &lc->bound_dn );
 294                         if ( op->o_conn && !BER_BVISEMPTY( &op->o_conn->c_dn )
 295                                         && ( op->o_bd == op->o_conn->c_authz_backend ) ) {
 296
 297                                 dncookie dc;
 298                                 struct berval bv;
 299
 300                                 /*
 301                                  * Rewrite the bind dn if needed
 302                                  */
 303                                 dc.rwmap = &li->rwmap;
 304 #ifdef ENABLE_REWRITE
 305                                 dc.conn = op->o_conn;
 306                                 dc.rs = rs;
 307                                 dc.ctx = "bindDN";
 308 #else
 309                                 dc.tofrom = 1;
 310                                 dc.normalized = 0;
 311 #endif
 312
 313                                 if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn, &bv ) ) {
 314                                         send_ldap_result( op, rs );
 315                                         return NULL;
 316                                 }
 317
 318                                 if ( bv.bv_val == op->o_conn->c_dn.bv_val ) {
 319                                         ber_dupbv( &lc->bound_dn, &bv );
 320                                 } else {
 321                                         lc->bound_dn = bv;
 322                                 }
 323                         }
 324                 }
 325
 326                 lc->bound = 0;
 327
 328                 /* Inserts the newly created ldapconn in the avl tree */
 329                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 330                 rs->sr_err = avl_insert( &li->conntree, (caddr_t)lc,
 331                         ldap_back_conn_cmp, ldap_back_conn_dup );
 332
 333 #if PRINT_CONNTREE > 0
 334                 myprint( li->conntree );
 335 #endif /* PRINT_CONNTREE */
 336
 337                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 338
 339 #ifdef NEW_LOGGING
 340                 LDAP_LOG( BACK_LDAP, INFO,
 341                         "ldap_back_getconn: conn %p inserted\n", (void *) lc, 0, 0);
 342 #else /* !NEW_LOGGING */
 343                 Debug( LDAP_DEBUG_TRACE,
 344                         "=>ldap_back_getconn: conn %p inserted\n", (void *) lc, 0, 0 );
 345 #endif /* !NEW_LOGGING */
 346
 347                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 348                 if ( rs->sr_err != 0 ) {
 349                         ldap_back_conn_free( lc );
 350                         if (op->o_conn) {
 351                                 send_ldap_error( op, rs, LDAP_OTHER,
 352                                 "internal server error" );
 353                         }
 354                         return( NULL );
 355                 }
 356         } else {
 357 #ifdef NEW_LOGGING
 358                 LDAP_LOG( BACK_LDAP, INFO,
 359                         "ldap_back_getconn: conn %p fetched\n",
 360                         (void *) lc, 0, 0 );
 361 #else /* !NEW_LOGGING */
 362                 Debug( LDAP_DEBUG_TRACE,
 363                         "=>ldap_back_getconn: conn %p fetched\n", (void *) lc, 0, 0 );
 364 #endif /* !NEW_LOGGING */
 365         }
 366
 367         return( lc );
 368 }
 369
 370 /*
 371  * ldap_back_dobind
 372  *
 373  * Note: as the check for the value of lc->bound was already here, I removed
 374  * it from all the callers, and I made the function return the flag, so
 375  * it can be used to simplify the check.
 376  */
 377 int
 378 ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs )
 379 {
 380         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 381         int rc;
 382         ber_int_t msgid;
 383
 384         ldap_pvt_thread_mutex_lock( &lc->lc_mutex );
 385         if ( !lc->bound ) {
 386 #ifdef LDAP_BACK_PROXY_AUTHZ
 387                 /*
 388                  * FIXME: we need to let clients use proxyAuthz
 389                  * otherwise we cannot do symmetric pools of servers;
 390                  * we have to live with the fact that a user can
 391                  * authorize itself as any ID that is allowed
 392                  * by the authzTo directive of the "proxyauthzdn".
 393                  */
 394                 /*
 395                  * NOTE: current Proxy Authorization specification
 396                  * and implementation do not allow proxy authorization
 397                  * control to be provided with Bind requests
 398                  */
 399                 /*
 400                  * if no bind took place yet, but the connection is bound
 401                  * and the "proxyauthzdn" is set, then bind as
 402                  * "proxyauthzdn" and explicitly add the proxyAuthz
 403                  * control to every operation with the dn bound
 404                  * to the connection as control value.
 405                  */
 406                 if ( op->o_conn != NULL && ( ( BER_BVISNULL( &lc->bound_dn ) || BER_BVISEMPTY( &lc->bound_dn ) ) ) )
 407                 {
 408                         struct berval   binddn = slap_empty_bv;
 409                         struct berval   bindcred = slap_empty_bv;
 410                         int             dobind = 0;
 411
 412                         /* bind as proxyauthzdn only if no idassert mode
 413                          * is requested, or if the client's identity
 414                          * is authorized */
 415                         switch ( li->idassert_mode ) {
 416                         case LDAP_BACK_IDASSERT_LEGACY:
 417                                 if ( !BER_BVISNULL( &op->o_conn->c_dn ) && !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
 418                                         if ( !BER_BVISNULL( &li->idassert_authcDN ) && !BER_BVISEMPTY( &li->idassert_authcDN ) )
 419                                         {
 420                                                 binddn = li->idassert_authcDN;
 421                                                 bindcred = li->idassert_passwd;
 422                                                 dobind = 1;
 423                                         }
 424                                 }
 425                                 break;
 426
 427                         default:
 428                                 if ( li->idassert_authz ) {
 429                                         struct berval   authcDN = BER_BVISNULL( &op->o_conn->c_dn ) ? slap_empty_bv : op->o_conn->c_dn;
 430
 431                                         rs->sr_err = slap_sasl_matches( op, li->idassert_authz,
 432                                                         &authcDN, &authcDN );
 433                                         if ( rs->sr_err != LDAP_SUCCESS ) {
 434                                                 send_ldap_result( op, rs );
 435                                                 lc->bound = 0;
 436                                                 goto done;
 437                                         }
 438                                 }
 439
 440                                 binddn = li->idassert_authcDN;
 441                                 bindcred = li->idassert_passwd;
 442                                 dobind = 1;
 443                                 break;
 444                         }
 445
 446                         if ( dobind && li->idassert_authmethod == LDAP_AUTH_SASL ) {
 447 #ifdef HAVE_CYRUS_SASL
 448                                 void            *defaults = NULL;
 449                                 struct berval   authzID = BER_BVNULL;
 450                                 int             freeauthz = 0;
 451
 452                                 /* if SASL supports native authz, prepare for it */
 453                                 if ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) {
 454                                         switch ( li->idassert_mode ) {
 455                                         case LDAP_BACK_IDASSERT_OTHERID:
 456                                         case LDAP_BACK_IDASSERT_OTHERDN:
 457                                                 authzID = li->idassert_authzID;
 458                                                 break;
 459
 460                                         case LDAP_BACK_IDASSERT_ANONYMOUS:
 461                                                 BER_BVSTR( &authzID, "dn:" );
 462                                                 break;
 463
 464                                         case LDAP_BACK_IDASSERT_SELF:
 465                                                 if ( BER_BVISNULL( &op->o_conn->c_dn ) ) {
 466                                                         /* connection is not authc'd, so don't idassert */
 467                                                         /* FIXME: cyrus-sasl doesn't honor empty authzID!
 468                                                          * i.e. NULL is equivalent to ""! */
 469                                                         break;
 470                                                 }
 471                                                 authzID.bv_len = STRLENOF( "dn:" ) + op->o_conn->c_dn.bv_len;
 472                                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
 473                                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
 474                                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
 475                                                                 op->o_conn->c_dn.bv_val, op->o_conn->c_dn.bv_len + 1 );
 476                                                 freeauthz = 1;
 477                                                 break;
 478
 479                                         default:
 480                                                 break;
 481                                         }
 482                                 }
 483
 484 #if 0   /* will deal with this later... */
 485                                 if ( sasl_secprops != NULL ) {
 486                                         rs->sr_err = ldap_set_option( lc->ld, LDAP_OPT_X_SASL_SECPROPS,
 487                                                 (void *) sasl_secprops );
 488
 489                                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
 490                                                 send_ldap_result( op, rs );
 491                                                 lc->bound = 0;
 492                                                 goto done;
 493
 494                                         }
 495                                 }
 496 #endif
 497
 498                                 defaults = lutil_sasl_defaults( lc->ld,
 499                                                 li->idassert_sasl_mech.bv_val,
 500                                                 li->idassert_sasl_realm.bv_val,
 501                                                 li->idassert_authcID.bv_val,
 502                                                 li->idassert_passwd.bv_val,
 503                                                 authzID.bv_val );
 504
 505                                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->ld, binddn.bv_val,
 506                                                 li->idassert_sasl_mech.bv_val, NULL, NULL,
 507                                                 li->idassert_sasl_flags, lutil_sasl_interact,
 508                                                 defaults );
 509
 510                                 lutil_sasl_freedefs( defaults );
 511                                 if ( freeauthz ) {
 512                                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
 513                                 }
 514
 515                                 rs->sr_err = slap_map_api2result( rs );
 516                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 517                                         lc->bound = 0;
 518                                         send_ldap_result( op, rs );
 519
 520                                 } else {
 521                                         lc->bound = 1;
 522                                 }
 523                                 goto done;
 524 #endif /* HAVE_CYRUS_SASL */
 525                         }
 526
 527                         switch ( li->idassert_authmethod ) {
 528                         case LDAP_AUTH_SIMPLE:
 529                                 rs->sr_err = ldap_sasl_bind(lc->ld,
 530                                                 binddn.bv_val, LDAP_SASL_SIMPLE,
 531                                                 &bindcred, NULL, NULL, &msgid);
 532                                 break;
 533
 534                         case LDAP_AUTH_NONE:
 535                                 lc->bound = 1;
 536                                 goto done;
 537
 538                         default:
 539                                 /* unsupported! */
 540                                 lc->bound = 0;
 541                                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 542                                 send_ldap_result( op, rs );
 543                                 goto done;
 544                         }
 545
 546                 } else
 547 #endif /* LDAP_BACK_PROXY_AUTHZ */
 548                 {
 549                         rs->sr_err = ldap_sasl_bind(lc->ld, lc->bound_dn.bv_val,
 550                                 LDAP_SASL_SIMPLE, &lc->cred, NULL, NULL, &msgid);
 551                 }
 552
 553                 rc = ldap_back_op_result( lc, op, rs, msgid, 0 );
 554                 if (rc == LDAP_SUCCESS) {
 555                         lc->bound = 1;
 556                 }
 557         }
 558
 559 done:;
 560         rc = lc->bound;
 561         ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 562         return rc;
 563 }
 564
 565 /*
 566  * ldap_back_rebind
 567  *
 568  * This is a callback used for chasing referrals using the same
 569  * credentials as the original user on this session.
 570  */
 571 static int
 572 ldap_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 573         ber_int_t msgid, void *params )
 574 {
 575         struct ldapconn *lc = params;
 576
 577         return ldap_bind_s( ld, lc->bound_dn.bv_val, lc->cred.bv_val, LDAP_AUTH_SIMPLE );
 578 }
 579
 580 #if 0 /* deprecated in favour of slap_map_api2result() */
 581 /* Map API errors to protocol errors... */
 582 int
 583 ldap_back_map_result( SlapReply *rs )
 584 {
 585         switch(rs->sr_err)
 586         {
 587         case LDAP_SERVER_DOWN:
 588                 return LDAP_UNAVAILABLE;
 589         case LDAP_LOCAL_ERROR:
 590                 return LDAP_OTHER;
 591         case LDAP_ENCODING_ERROR:
 592         case LDAP_DECODING_ERROR:
 593                 return LDAP_PROTOCOL_ERROR;
 594         case LDAP_TIMEOUT:
 595                 return LDAP_UNAVAILABLE;
 596         case LDAP_AUTH_UNKNOWN:
 597                 return LDAP_AUTH_METHOD_NOT_SUPPORTED;
 598         case LDAP_FILTER_ERROR:
 599                 rs->sr_text = "Filter error";
 600                 return LDAP_OTHER;
 601         case LDAP_USER_CANCELLED:
 602                 rs->sr_text = "User cancelled";
 603                 return LDAP_OTHER;
 604         case LDAP_PARAM_ERROR:
 605                 return LDAP_PROTOCOL_ERROR;
 606         case LDAP_NO_MEMORY:
 607                 return LDAP_OTHER;
 608         case LDAP_CONNECT_ERROR:
 609                 return LDAP_UNAVAILABLE;
 610         case LDAP_NOT_SUPPORTED:
 611                 return LDAP_UNWILLING_TO_PERFORM;
 612         case LDAP_CONTROL_NOT_FOUND:
 613                 return LDAP_PROTOCOL_ERROR;
 614         case LDAP_NO_RESULTS_RETURNED:
 615                 return LDAP_NO_SUCH_OBJECT;
 616         case LDAP_MORE_RESULTS_TO_RETURN:
 617                 rs->sr_text = "More results to return";
 618                 return LDAP_OTHER;
 619         case LDAP_CLIENT_LOOP:
 620         case LDAP_REFERRAL_LIMIT_EXCEEDED:
 621                 return LDAP_LOOP_DETECT;
 622         default:
 623                 if ( LDAP_API_ERROR(rs->sr_err) )
 624                         return LDAP_OTHER;
 625                 return rs->sr_err;
 626         }
 627 }
 628 #endif
 629
 630 int
 631 ldap_back_op_result(struct ldapconn *lc, Operation *op, SlapReply *rs,
 632         ber_int_t msgid, int sendok)
 633 {
 634         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 635         char *match = NULL;
 636         LDAPMessage *res = NULL;
 637         char *text = NULL;
 638
 639 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 640
 641         rs->sr_text = NULL;
 642         rs->sr_matched = NULL;
 643
 644         /* if the error recorded in the reply corresponds
 645          * to a successful state, get the error from the
 646          * remote server response */
 647         if ( ERR_OK( rs->sr_err ) ) {
 648                 /* if result parsing fails, note the failure reason */
 649                 if ( ldap_result( lc->ld, msgid, 1, NULL, &res ) == -1 ) {
 650                         ldap_get_option(lc->ld, LDAP_OPT_ERROR_NUMBER,
 651                                         &rs->sr_err);
 652
 653                 /* otherwise get the result; if it is not
 654                  * LDAP_SUCCESS, record it in the reply
 655                  * structure (this includes
 656                  * LDAP_COMPARE_{TRUE|FALSE}) */
 657                 } else {
 658                         int rc = ldap_parse_result(lc->ld, res, &rs->sr_err,
 659                                         &match, &text, NULL, NULL, 1);
 660                         rs->sr_text = text;
 661                         if ( rc != LDAP_SUCCESS ) rs->sr_err = rc;
 662                 }
 663         }
 664
 665         /* if the error in the reply structure is not
 666          * LDAP_SUCCESS, try to map it from client
 667          * to server error */
 668         if ( !ERR_OK( rs->sr_err ) ) {
 669                 rs->sr_err = slap_map_api2result( rs );
 670
 671                 /* internal ops ( op->o_conn == NULL )
 672                  * must not reply to client */
 673                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 674                         struct berval dn, mdn;
 675                         dncookie dc;
 676
 677                         dc.rwmap = &li->rwmap;
 678 #ifdef ENABLE_REWRITE
 679                         dc.conn = op->o_conn;
 680                         dc.rs = rs;
 681                         dc.ctx = "matchedDN";
 682 #else
 683                         dc.tofrom = 0;
 684                         dc.normalized = 0;
 685 #endif
 686                         ber_str2bv(match, 0, 0, &dn);
 687                         ldap_back_dn_massage(&dc, &dn, &mdn);
 688
 689                         /* record the (massaged) matched
 690                          * DN into the reply structure */
 691                         rs->sr_matched = mdn.bv_val;
 692
 693                 }
 694         }
 695         if ( op->o_conn && ( sendok || rs->sr_err != LDAP_SUCCESS ) ) {
 696                 send_ldap_result( op, rs );
 697         }
 698         if ( match ) {
 699                 if ( rs->sr_matched != match ) {
 700                         free( (char *)rs->sr_matched );
 701                 }
 702                 rs->sr_matched = NULL;
 703                 ldap_memfree( match );
 704         }
 705         if ( text ) {
 706                 ldap_memfree( text );
 707         }
 708         rs->sr_text = NULL;
 709         return( ERR_OK( rs->sr_err ) ? 0 : -1 );
 710 }
 711
 712 #ifdef LDAP_BACK_PROXY_AUTHZ
 713 /*
 714  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
 715  * to existing server-side controls if required; if not,
 716  * the existing server-side controls are placed in *pctrls.
 717  * The caller, after using the controls in client API
 718  * operations, if ( *pctrls != op->o_ctrls ), should
 719  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
 720  * The function returns success if the control could
 721  * be added if required, or if it did nothing; in the future,
 722  * it might return some error if it failed.
 723  *
 724  * if no bind took place yet, but the connection is bound
 725  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
 726  * and explicitly add proxyAuthz the control to every operation
 727  * with the dn bound to the connection as control value.
 728  *
 729  * If no server-side controls are defined for the operation,
 730  * simply add the proxyAuthz control; otherwise, if the
 731  * proxyAuthz control is not already set, add it as
 732  * the first one (FIXME: is controls order significant
 733  * for security?).
 734  */
 735 int
 736 ldap_back_proxy_authz_ctrl(
 737                 struct ldapconn *lc,
 738                 Operation       *op,
 739                 SlapReply       *rs,
 740                 LDAPControl     ***pctrls )
 741 {
 742         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
 743         LDAPControl     **ctrls = NULL;
 744         int             i = 0;
 745         struct berval   assertedID;
 746
 747         *pctrls = NULL;
 748
 749         if ( ( BER_BVISNULL( &li->idassert_authcID ) || BER_BVISEMPTY( &li->idassert_authcID ) )
 750                         && ( BER_BVISNULL( &li->idassert_authcDN ) || BER_BVISEMPTY( &li->idassert_authcDN ) ) ) {
 751                 goto done;
 752         }
 753
 754         if ( !op->o_conn ) {
 755                 goto done;
 756         }
 757
 758         if ( li->idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
 759                 if ( op->o_proxy_authz ) {
 760                         /*
 761                          * FIXME: we do not want to perform proxyAuthz
 762                          * on behalf of the client, because this would
 763                          * be performed with "proxyauthzdn" privileges.
 764                          *
 765                          * This might actually be too strict, since
 766                          * the "proxyauthzdn" authzTo, and each entry's
 767                          * authzFrom attributes may be crafted
 768                          * to avoid unwanted proxyAuthz to take place.
 769                          */
 770 #if 0
 771                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 772                         rs->sr_text = "proxyAuthz not allowed within namingContext";
 773 #endif
 774                         goto done;
 775                 }
 776
 777                 if ( !BER_BVISNULL( &lc->bound_dn ) && !BER_BVISEMPTY( &lc->bound_dn ) ) {
 778                         goto done;
 779                 }
 780
 781                 if ( BER_BVISNULL( &op->o_conn->c_dn ) || BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
 782                         goto done;
 783                 }
 784
 785                 if ( BER_BVISNULL( &li->idassert_authcDN ) || BER_BVISEMPTY( &li->idassert_authcDN ) ) {
 786                         goto done;
 787                 }
 788
 789         } else if ( li->idassert_authmethod == LDAP_AUTH_SASL ) {
 790                 if ( ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
 791                                 && !BER_BVISNULL( &op->o_conn->c_dn ) && !BER_BVISEMPTY( &op->o_conn->c_dn ) )
 792                 {
 793                         /* already asserted in SASL via native authz */
 794                         goto done;
 795                 }
 796
 797         } else if ( li->idassert_authz ) {
 798                 int             rc;
 799                 struct berval   authcDN = BER_BVISNULL( &op->o_conn->c_dn ) ? slap_empty_bv : op->o_conn->c_dn;
 800
 801
 802                 rc = slap_sasl_matches( op, li->idassert_authz,
 803                                 &authcDN, & authcDN );
 804                 if ( rc != LDAP_SUCCESS ) {
 805                         /* op->o_conn->c_dn is not authorized
 806                          * to use idassert */
 807                         return rc;
 808                 }
 809         }
 810
 811         if ( op->o_proxy_authz ) {
 812                 /*
 813                  * FIXME: we can:
 814                  * 1) ignore the already set proxyAuthz control
 815                  * 2) leave it in place, and don't set ours
 816                  * 3) add both
 817                  * 4) reject the operation
 818                  *
 819                  * option (4) is very drastic
 820                  * option (3) will make the remote server reject
 821                  * the operation, thus being equivalent to (4)
 822                  * option (2) will likely break the idassert
 823                  * assumptions, so we cannot accept it;
 824                  * option (1) means that we are contradicting
 825                  * the client's reques.
 826                  *
 827                  * I think (4) is the only correct choice.
 828                  */
 829                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 830                 rs->sr_text = "proxyAuthz not allowed within namingContext";
 831         }
 832
 833         switch ( li->idassert_mode ) {
 834         case LDAP_BACK_IDASSERT_LEGACY:
 835         case LDAP_BACK_IDASSERT_SELF:
 836                 /* original behavior:
 837                  * assert the client's identity */
 838                 /* FIXME: we may get here if binding anonymously,
 839                  * because cyrus sasl doesn't honor empty (i.e. "")
 840                  * authzID */
 841                 assertedID = BER_BVISNULL( &op->o_conn->c_dn ) ? slap_empty_bv : op->o_conn->c_dn;
 842                 break;
 843
 844         case LDAP_BACK_IDASSERT_ANONYMOUS:
 845                 /* assert "anonymous" */
 846                 assertedID = slap_empty_bv;
 847                 break;
 848
 849         case LDAP_BACK_IDASSERT_NOASSERT:
 850                 /* don't assert; bind as proxyauthzdn */
 851                 goto done;
 852
 853         case LDAP_BACK_IDASSERT_OTHERID:
 854         case LDAP_BACK_IDASSERT_OTHERDN:
 855                 /* assert idassert DN */
 856                 assertedID = li->idassert_authzID;
 857                 break;
 858
 859         default:
 860                 assert( 0 );
 861         }
 862
 863         if ( BER_BVISNULL( &assertedID ) ) {
 864                 assertedID = slap_empty_bv;
 865         }
 866
 867         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
 868         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
 869
 870         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
 871         ctrls[ 0 ]->ldctl_iscritical = 1;
 872
 873         switch ( li->idassert_mode ) {
 874         /* already in u:ID or dn:DN form */
 875         case LDAP_BACK_IDASSERT_OTHERID:
 876         case LDAP_BACK_IDASSERT_OTHERDN:
 877                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
 878                 break;
 879
 880         /* needs the dn: prefix */
 881         default:
 882                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
 883                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
 884                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
 885                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val + STRLENOF( "dn:" ),
 886                                 assertedID.bv_val, assertedID.bv_len + 1 );
 887                 break;
 888         }
 889
 890         if ( op->o_ctrls ) {
 891                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
 892                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
 893                 }
 894         }
 895         ctrls[ i + 1 ] = NULL;
 896
 897 done:;
 898         if ( ctrls == NULL ) {
 899                 ctrls = op->o_ctrls;
 900         }
 901
 902         *pctrls = ctrls;
 903
 904         return rs->sr_err;
 905 }
 906 #endif /* LDAP_BACK_PROXY_AUTHZ */