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 1999-2005 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 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/errno.h>
  29 #include <ac/socket.h>
  30 #include <ac/string.h>
  31
  32 #define AVL_INTERNAL
  33 #include "slap.h"
  34 #include "back-ldap.h"
  35
  36 #include <lutil_ldap.h>
  37
  38 #define PRINT_CONNTREE 0
  39
  40 static LDAP_REBIND_PROC ldap_back_rebind;
  41
  42 static int
  43 ldap_back_proxy_authz_bind( struct ldapconn *lc, Operation *op, SlapReply *rs );
  44
  45 static int
  46 ldap_back_prepare_conn( struct ldapconn **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  47
  48 int
  49 ldap_back_bind( Operation *op, SlapReply *rs )
  50 {
  51         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
  52         struct ldapconn *lc;
  53
  54         int rc = 0;
  55         ber_int_t msgid;
  56
  57         lc = ldap_back_getconn( op, rs, LDAP_BACK_SENDERR );
  58         if ( !lc ) {
  59                 return rs->sr_err;
  60         }
  61
  62         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
  63                 ch_free( lc->lc_bound_ndn.bv_val );
  64                 BER_BVZERO( &lc->lc_bound_ndn );
  65         }
  66         lc->lc_bound = 0;
  67
  68         /* method is always LDAP_AUTH_SIMPLE if we got here */
  69         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
  70                         LDAP_SASL_SIMPLE,
  71                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
  72         rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_SENDERR );
  73
  74         if ( rc == LDAP_SUCCESS ) {
  75                 /* If defined, proxyAuthz will be used also when
  76                  * back-ldap is the authorizing backend; for this
  77                  * purpose, a successful bind is followed by a
  78                  * bind with the configured identity assertion */
  79                 /* NOTE: use with care */
  80                 if ( li->idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
  81                         ldap_back_proxy_authz_bind( lc, op, rs );
  82                         if ( lc->lc_bound == 0 ) {
  83                                 rc = 1;
  84                                 goto done;
  85                         }
  86                 }
  87
  88                 lc->lc_bound = 1;
  89                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
  90
  91                 if ( LDAP_BACK_SAVECRED( li ) ) {
  92                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
  93                                 memset( lc->lc_cred.bv_val, 0,
  94                                                 lc->lc_cred.bv_len );
  95                                 ch_free( lc->lc_cred.bv_val );
  96                         }
  97                         ber_dupbv( &lc->lc_cred, &op->orb_cred );
  98                         ldap_set_rebind_proc( lc->lc_ld, ldap_back_rebind, lc );
  99                 }
 100         }
 101 done:;
 102
 103         /* must re-insert if local DN changed as result of bind */
 104         if ( lc->lc_bound && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) {
 105                 int             lerr;
 106
 107                 /* wait for all other ops to release the connection */
 108 retry_lock:;
 109                 switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 110                 case LDAP_PVT_THREAD_EBUSY:
 111                 default:
 112                         ldap_pvt_thread_yield();
 113                         goto retry_lock;
 114
 115                 case 0:
 116                         if ( lc->lc_refcnt > 1 ) {
 117                                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 118                                 ldap_pvt_thread_yield();
 119                                 goto retry_lock;
 120                         }
 121                         break;
 122                 }
 123
 124                 assert( lc->lc_refcnt == 1 );
 125                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 126                                 ldap_back_conn_cmp );
 127                 assert( lc != NULL );
 128
 129                 if ( !BER_BVISNULL( &lc->lc_local_ndn ) ) {
 130                         ch_free( lc->lc_local_ndn.bv_val );
 131                 }
 132                 ber_dupbv( &lc->lc_local_ndn, &op->o_req_ndn );
 133                 lerr = avl_insert( &li->conntree, (caddr_t)lc,
 134                         ldap_back_conn_cmp, ldap_back_conn_dup );
 135                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 136                 if ( lerr == -1 ) {
 137                         /* handle this! (e.g. wait until refcnt goes to 1...) */
 138                         ldap_back_conn_free( lc );
 139                         lc = NULL;
 140                 }
 141         }
 142
 143         if ( lc != NULL ) {
 144                 ldap_back_release_conn( op, rs, lc );
 145         }
 146
 147         return( rc );
 148 }
 149
 150 /*
 151  * ldap_back_conn_cmp
 152  *
 153  * compares two struct ldapconn based on the value of the conn pointer;
 154  * used by avl stuff
 155  */
 156 int
 157 ldap_back_conn_cmp( const void *c1, const void *c2 )
 158 {
 159         const struct ldapconn *lc1 = (const struct ldapconn *)c1;
 160         const struct ldapconn *lc2 = (const struct ldapconn *)c2;
 161         int rc;
 162
 163         /* If local DNs don't match, it is definitely not a match */
 164         rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 165         if ( rc ) {
 166                 return rc;
 167         }
 168
 169         /* For shared sessions, conn is NULL. Only explicitly
 170          * bound sessions will have non-NULL conn.
 171          */
 172         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 173 }
 174
 175 /*
 176  * ldap_back_conn_dup
 177  *
 178  * returns -1 in case a duplicate struct ldapconn has been inserted;
 179  * used by avl stuff
 180  */
 181 int
 182 ldap_back_conn_dup( void *c1, void *c2 )
 183 {
 184         struct ldapconn *lc1 = (struct ldapconn *)c1;
 185         struct ldapconn *lc2 = (struct ldapconn *)c2;
 186
 187         /* Cannot have more than one shared session with same DN */
 188         if ( dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) &&
 189                         lc1->lc_conn == lc2->lc_conn )
 190         {
 191                 return -1;
 192         }
 193
 194         return 0;
 195 }
 196
 197 #if PRINT_CONNTREE > 0
 198 static void
 199 ravl_print( Avlnode *root, int depth )
 200 {
 201         int     i;
 202         struct ldapconn *lc;
 203
 204         if ( root == 0 ) {
 205                 return;
 206         }
 207
 208         ravl_print( root->avl_right, depth+1 );
 209
 210         for ( i = 0; i < depth; i++ ) {
 211                 printf( "   " );
 212         }
 213
 214         lc = root->avl_data;
 215         printf( "lc(%lx) local(%s) conn(%lx) %d\n",
 216                         lc, lc->lc_local_ndn.bv_val, lc->lc_conn, root->avl_bf );
 217
 218         ravl_print( root->avl_left, depth+1 );
 219 }
 220
 221 static void
 222 myprint( Avlnode *root )
 223 {
 224         printf( "********\n" );
 225
 226         if ( root == 0 ) {
 227                 printf( "\tNULL\n" );
 228
 229         } else {
 230                 ravl_print( root, 0 );
 231         }
 232
 233         printf( "********\n" );
 234 }
 235 #endif /* PRINT_CONNTREE */
 236
 237 int
 238 ldap_back_freeconn( Operation *op, struct ldapconn *lc )
 239 {
 240         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
 241         int             rc = 0;
 242
 243 retry_lock:;
 244         switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 245         case LDAP_PVT_THREAD_EBUSY:
 246         default:
 247                 ldap_pvt_thread_yield();
 248                 goto retry_lock;
 249
 250         case 0:
 251                 break;
 252         }
 253
 254         assert( lc->lc_refcnt > 0 );
 255         if ( --lc->lc_refcnt == 0 ) {
 256                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 257                                 ldap_back_conn_cmp );
 258                 assert( lc != NULL );
 259
 260                 ldap_back_conn_free( (void *)lc );
 261         }
 262         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 263
 264         return rc;
 265 }
 266
 267 static int
 268 ldap_back_prepare_conn( struct ldapconn **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 269 {
 270         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 271         int             vers = op->o_protocol;
 272         LDAP            *ld = NULL;
 273
 274         assert( lcp != NULL );
 275
 276         rs->sr_err = ldap_initialize( &ld, li->url );
 277         if ( rs->sr_err != LDAP_SUCCESS ) {
 278                 goto error_return;
 279         }
 280
 281         /* Set LDAP version. This will always succeed: If the client
 282          * bound with a particular version, then so can we.
 283          */
 284         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&vers );
 285
 286         /* automatically chase referrals ("[dont-]chase-referrals" statement) */
 287         if ( LDAP_BACK_CHASE_REFERRALS( li ) ) {
 288                 ldap_set_option( ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON );
 289         }
 290
 291 #ifdef HAVE_TLS
 292         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 293         if ( ( LDAP_BACK_USE_TLS( li ) || ( op->o_conn->c_is_tls && LDAP_BACK_PROPAGATE_TLS( li ) ) )
 294                                 && !ldap_is_ldaps_url( li->url ) )
 295         {
 296 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 297                 /*
 298                  * use asynchronous StartTLS
 299                  * in case, chase referral (not implemented yet)
 300                  */
 301                 int             msgid;
 302
 303                 rs->sr_err = ldap_start_tls( ld, NULL, NULL, &msgid );
 304                 if ( rs->sr_err == LDAP_SUCCESS ) {
 305                         LDAPMessage     *res = NULL;
 306                         int             rc, retries = 1;
 307                         struct timeval  tv = { 0, 0 };
 308
 309 retry:;
 310                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 311                         if ( rc < 0 ) {
 312                                 rs->sr_err = LDAP_OTHER;
 313
 314                         } else if ( rc == 0 ) {
 315                                 if ( retries ) {
 316                                         retries--;
 317                                         tv.tv_sec = 0;
 318                                         tv.tv_usec = 100000;
 319                                         goto retry;
 320                                 }
 321                                 rs->sr_err = LDAP_OTHER;
 322
 323                         } else if ( rc == LDAP_RES_EXTENDED ) {
 324                                 struct berval   *data = NULL;
 325
 326                                 rs->sr_err = ldap_parse_extended_result( ld, res,
 327                                                 NULL, &data, 0 );
 328                                 if ( rs->sr_err == LDAP_SUCCESS ) {
 329                                         rs->sr_err = ldap_result2error( ld, res, 1 );
 330                                         res = NULL;
 331
 332                                         /* FIXME: in case a referral
 333                                          * is returned, should we try
 334                                          * using it instead of the
 335                                          * configured URI? */
 336                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 337                                                 ldap_install_tls( ld );
 338
 339                                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
 340                                                 rs->sr_err = LDAP_OTHER;
 341                                                 rs->sr_text = "unwilling to chase referral returned by Start TLS exop";
 342                                         }
 343
 344                                         if ( data ) {
 345                                                 if ( data->bv_val ) {
 346                                                         ber_memfree( data->bv_val );
 347                                                 }
 348                                                 ber_memfree( data );
 349                                         }
 350                                 }
 351
 352                         } else {
 353                                 rs->sr_err = LDAP_OTHER;
 354                         }
 355
 356                         if ( res != NULL ) {
 357                                 ldap_msgfree( res );
 358                         }
 359                 }
 360 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 361                 /*
 362                  * use synchronous StartTLS
 363                  */
 364                 rs->sr_err = ldap_start_tls_s( ld, NULL, NULL );
 365 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 366
 367                 /* if StartTLS is requested, only attempt it if the URL
 368                  * is not "ldaps://"; this may occur not only in case
 369                  * of misconfiguration, but also when used in the chain
 370                  * overlay, where the "uri" can be parsed out of a referral */
 371                 if ( rs->sr_err == LDAP_SERVER_DOWN
 372                                 || ( rs->sr_err != LDAP_SUCCESS && LDAP_BACK_TLS_CRITICAL( li ) ) )
 373                 {
 374                         ldap_unbind_ext_s( ld, NULL, NULL );
 375                         goto error_return;
 376                 }
 377
 378                 /* in case Start TLS is not critical */
 379                 rs->sr_err = LDAP_SUCCESS;
 380         }
 381 #endif /* HAVE_TLS */
 382
 383         if ( *lcp == NULL ) {
 384                 *lcp = (struct ldapconn *)ch_malloc( sizeof( struct ldapconn ) );
 385                 memset( *lcp, 0, sizeof( struct ldapconn ) );
 386         }
 387         (*lcp)->lc_ld = ld;
 388         (*lcp)->lc_refcnt = 1;
 389
 390 error_return:;
 391         if ( rs->sr_err != LDAP_SUCCESS ) {
 392                 rs->sr_err = slap_map_api2result( rs );
 393                 if ( sendok & LDAP_BACK_SENDERR ) {
 394                         if ( rs->sr_text == NULL ) {
 395                                 rs->sr_text = "ldap_initialize() failed";
 396                         }
 397                         send_ldap_result( op, rs );
 398                         rs->sr_text = NULL;
 399                 }
 400         }
 401
 402         return rs->sr_err;
 403 }
 404
 405 struct ldapconn *
 406 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 407 {
 408         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 409         struct ldapconn *lc, lc_curr = { 0 };
 410
 411         /* Searches for a ldapconn in the avl tree */
 412
 413         /* Explicit binds must not be shared */
 414         if ( op->o_tag == LDAP_REQ_BIND
 415                 || ( op->o_conn
 416                         && op->o_conn->c_authz_backend
 417                         && op->o_bd->be_private == op->o_conn->c_authz_backend->be_private ) )
 418         {
 419                 lc_curr.lc_conn = op->o_conn;
 420
 421         } else {
 422                 lc_curr.lc_conn = NULL;
 423         }
 424
 425         /* Internal searches are privileged and shared. So is root. */
 426         if ( op->o_do_not_cache || be_isroot( op ) ) {
 427                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 428                 lc_curr.lc_conn = NULL;
 429                 lc_curr.lc_ispriv = 1;
 430
 431         } else {
 432                 lc_curr.lc_local_ndn = op->o_ndn;
 433         }
 434
 435 retry_lock:;
 436         switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 437         case LDAP_PVT_THREAD_EBUSY:
 438         default:
 439                 ldap_pvt_thread_yield();
 440                 goto retry_lock;
 441
 442         case 0:
 443                 break;
 444         }
 445
 446         lc = (struct ldapconn *)avl_find( li->conntree,
 447                         (caddr_t)&lc_curr, ldap_back_conn_cmp );
 448         if ( lc != NULL ) {
 449                 lc->lc_refcnt++;
 450         }
 451         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 452
 453         /* Looks like we didn't get a bind. Open a new session... */
 454         if ( lc == NULL ) {
 455                 /* lc here must be NULL */
 456                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 457                         return NULL;
 458                 }
 459
 460                 lc->lc_conn = lc_curr.lc_conn;
 461                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 462
 463                 ldap_pvt_thread_mutex_init( &lc->lc_mutex );
 464
 465                 if ( lc_curr.lc_ispriv ) {
 466                         ber_dupbv( &lc->lc_cred, &li->acl_passwd );
 467                         ber_dupbv( &lc->lc_bound_ndn, &li->acl_authcDN );
 468                         lc->lc_ispriv = lc_curr.lc_ispriv;
 469
 470                 } else {
 471                         BER_BVZERO( &lc->lc_cred );
 472                         BER_BVZERO( &lc->lc_bound_ndn );
 473                         if ( op->o_conn && !BER_BVISEMPTY( &op->o_ndn )
 474                                         && op->o_bd == op->o_conn->c_authz_backend )
 475                         {
 476                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 477                         }
 478                 }
 479
 480                 lc->lc_bound = 0;
 481
 482                 /* Inserts the newly created ldapconn in the avl tree */
 483 retry_lock2:;
 484                 switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 485                 case LDAP_PVT_THREAD_EBUSY:
 486                 default:
 487                         ldap_pvt_thread_yield();
 488                         goto retry_lock2;
 489
 490                 case 0:
 491                         break;
 492                 }
 493
 494                 assert( lc->lc_refcnt == 1 );
 495                 rs->sr_err = avl_insert( &li->conntree, (caddr_t)lc,
 496                         ldap_back_conn_cmp, ldap_back_conn_dup );
 497
 498 #if PRINT_CONNTREE > 0
 499                 myprint( li->conntree );
 500 #endif /* PRINT_CONNTREE */
 501
 502                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 503
 504                 Debug( LDAP_DEBUG_TRACE,
 505                         "=>ldap_back_getconn: conn %p inserted (refcnt=%u)\n",
 506                         (void *)lc, lc->lc_refcnt, 0 );
 507
 508                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 509                 if ( rs->sr_err != 0 ) {
 510                         ldap_back_conn_free( lc );
 511                         rs->sr_err = LDAP_OTHER;
 512                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 513                                 send_ldap_error( op, rs, LDAP_OTHER,
 514                                         "internal server error" );
 515                         }
 516                         return NULL;
 517                 }
 518
 519         } else {
 520                 Debug( LDAP_DEBUG_TRACE,
 521                         "=>ldap_back_getconn: conn %p fetched (refcnt=%u)\n",
 522                         (void *)lc, lc->lc_refcnt, 0 );
 523         }
 524
 525         return lc;
 526 }
 527
 528 void
 529 ldap_back_release_conn(
 530         Operation               *op,
 531         SlapReply               *rs,
 532         struct ldapconn         *lc )
 533 {
 534         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 535
 536 retry_lock:;
 537         switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 538         case LDAP_PVT_THREAD_EBUSY:
 539         default:
 540                 ldap_pvt_thread_yield();
 541                 goto retry_lock;
 542
 543         case 0:
 544                 break;
 545         }
 546
 547         assert( lc->lc_refcnt > 0 );
 548         lc->lc_refcnt--;
 549         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 550 }
 551
 552 /*
 553  * ldap_back_dobind
 554  *
 555  * Note: as the check for the value of lc->lc_bound was already here, I removed
 556  * it from all the callers, and I made the function return the flag, so
 557  * it can be used to simplify the check.
 558  */
 559 static int
 560 ldap_back_dobind_int(
 561         struct ldapconn         *lc,
 562         Operation               *op,
 563         SlapReply               *rs,
 564         ldap_back_send_t        sendok,
 565         int                     retries )
 566 {
 567         int             rc;
 568         ber_int_t       msgid;
 569
 570         assert( retries >= 0 );
 571
 572         if ( !lc->lc_bound ) {
 573                 struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 574
 575                 /*
 576                  * FIXME: we need to let clients use proxyAuthz
 577                  * otherwise we cannot do symmetric pools of servers;
 578                  * we have to live with the fact that a user can
 579                  * authorize itself as any ID that is allowed
 580                  * by the authzTo directive of the "proxyauthzdn".
 581                  */
 582                 /*
 583                  * NOTE: current Proxy Authorization specification
 584                  * and implementation do not allow proxy authorization
 585                  * control to be provided with Bind requests
 586                  */
 587                 /*
 588                  * if no bind took place yet, but the connection is bound
 589                  * and the "idassert-authcDN" (or other ID) is set,
 590                  * then bind as the asserting identity and explicitly
 591                  * add the proxyAuthz control to every operation with the
 592                  * dn bound to the connection as control value.
 593                  * This is done also if this is the authrizing backend,
 594                  * but the "override" flag is given to idassert.
 595                  * It allows to use SASL bind and yet proxyAuthz users
 596                  */
 597                 if ( op->o_conn != NULL &&
 598                                 !op->o_do_not_cache &&
 599                                 ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 600                                   ( li->idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 601                 {
 602                         (void)ldap_back_proxy_authz_bind( lc, op, rs );
 603                         goto done;
 604                 }
 605
 606 #ifdef HAVE_CYRUS_SASL
 607                 if ( lc->lc_ispriv && li->acl_authmethod == LDAP_AUTH_SASL ) {
 608                         void            *defaults = NULL;
 609
 610 #if 1   /* will deal with this later... */
 611                         if ( li->acl_secprops != NULL ) {
 612                                 rc = ldap_set_option( lc->lc_ld,
 613                                         LDAP_OPT_X_SASL_SECPROPS, li->acl_secprops);
 614
 615                                 if( rc != LDAP_OPT_SUCCESS ) {
 616                                         Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 617                                                 "(%s,SECPROPS,\"%s\") failed!\n",
 618                                                 li->url, li->acl_secprops, 0 );
 619                                         goto done;
 620                                 }
 621                         }
 622 #endif
 623
 624                         defaults = lutil_sasl_defaults( lc->lc_ld,
 625                                         li->acl_sasl_mech.bv_val,
 626                                         li->acl_sasl_realm.bv_val,
 627                                         li->acl_authcID.bv_val,
 628                                         li->acl_passwd.bv_val,
 629                                         NULL );
 630
 631                         rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 632                                         li->acl_authcDN.bv_val,
 633                                         li->acl_sasl_mech.bv_val, NULL, NULL,
 634                                         LDAP_SASL_QUIET, lutil_sasl_interact,
 635                                         defaults );
 636
 637                         lutil_sasl_freedefs( defaults );
 638
 639                         rs->sr_err = slap_map_api2result( rs );
 640                         if ( rs->sr_err != LDAP_SUCCESS ) {
 641                                 lc->lc_bound = 0;
 642                                 send_ldap_result( op, rs );
 643
 644                         } else {
 645                                 lc->lc_bound = 1;
 646                         }
 647                         goto done;
 648                 }
 649 #endif /* HAVE_CYRUS_SASL */
 650
 651 retry:;
 652                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 653                                 lc->lc_bound_ndn.bv_val,
 654                                 LDAP_SASL_SIMPLE, &lc->lc_cred,
 655                                 NULL, NULL, &msgid );
 656
 657                 if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 658                         if ( retries > 0 ) {
 659 retry_lock:;
 660                                 switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 661                                 case LDAP_PVT_THREAD_EBUSY:
 662                                 default:
 663                                         ldap_pvt_thread_yield();
 664                                         goto retry_lock;
 665
 666                                 case 0:
 667                                         break;
 668                                 }
 669
 670                                 assert( lc->lc_refcnt > 0 );
 671                                 if ( lc->lc_refcnt == 1 ) {
 672                                         ldap_unbind_ext_s( lc->lc_ld, NULL, NULL );
 673                                         lc->lc_ld = NULL;
 674
 675                                         /* lc here must be the regular lc, reset and ready for init */
 676                                         rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 677                                 }
 678                                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 679                                 if ( rs->sr_err == LDAP_SUCCESS ) {
 680                                         retries--;
 681                                         goto retry;
 682                                 }
 683                         }
 684
 685                         ldap_back_freeconn( op, lc );
 686                         rs->sr_err = slap_map_api2result( rs );
 687
 688                         return 0;
 689                 }
 690
 691                 rc = ldap_back_op_result( lc, op, rs, msgid, sendok );
 692                 if ( rc == LDAP_SUCCESS ) {
 693                         lc->lc_bound = 1;
 694                 }
 695         }
 696
 697 done:;
 698         rc = lc->lc_bound;
 699         return rc;
 700 }
 701
 702 int
 703 ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 704 {
 705         int     rc;
 706
 707         ldap_pvt_thread_mutex_lock( &lc->lc_mutex );
 708         rc = ldap_back_dobind_int( lc, op, rs, sendok, 1 );
 709         ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 710
 711         return rc;
 712 }
 713
 714 /*
 715  * ldap_back_rebind
 716  *
 717  * This is a callback used for chasing referrals using the same
 718  * credentials as the original user on this session.
 719  */
 720 static int
 721 ldap_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 722         ber_int_t msgid, void *params )
 723 {
 724         struct ldapconn *lc = (struct ldapconn *)params;
 725
 726         /* FIXME: add checks on the URL/identity? */
 727
 728         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
 729                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
 730 }
 731
 732 int
 733 ldap_back_op_result(
 734                 struct ldapconn         *lc,
 735                 Operation               *op,
 736                 SlapReply               *rs,
 737                 ber_int_t               msgid,
 738                 ldap_back_send_t        sendok )
 739 {
 740         char            *match = NULL;
 741         LDAPMessage     *res = NULL;
 742         char            *text = NULL;
 743
 744 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 745
 746         rs->sr_text = NULL;
 747         rs->sr_matched = NULL;
 748
 749         /* if the error recorded in the reply corresponds
 750          * to a successful state, get the error from the
 751          * remote server response */
 752         if ( ERR_OK( rs->sr_err ) ) {
 753                 int             rc;
 754                 struct timeval  tv = { 0, 0 };
 755
 756 retry:;
 757                 /* if result parsing fails, note the failure reason */
 758                 switch ( ldap_result( lc->lc_ld, msgid, 1, &tv, &res ) ) {
 759                 case 0:
 760                         tv.tv_sec = 0;
 761                         tv.tv_usec = 100000;    /* 0.1 s */
 762                         ldap_pvt_thread_yield();
 763                         goto retry;
 764
 765                 case -1:
 766                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
 767                                         &rs->sr_err );
 768                         break;
 769
 770
 771                 /* otherwise get the result; if it is not
 772                  * LDAP_SUCCESS, record it in the reply
 773                  * structure (this includes
 774                  * LDAP_COMPARE_{TRUE|FALSE}) */
 775                 default:
 776                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 777                                         &match, &text, NULL, NULL, 1 );
 778                         rs->sr_text = text;
 779                         if ( rc != LDAP_SUCCESS ) {
 780                                 rs->sr_err = rc;
 781                         }
 782                 }
 783         }
 784
 785         /* if the error in the reply structure is not
 786          * LDAP_SUCCESS, try to map it from client
 787          * to server error */
 788         if ( !ERR_OK( rs->sr_err ) ) {
 789                 rs->sr_err = slap_map_api2result( rs );
 790
 791                 /* internal ops ( op->o_conn == NULL )
 792                  * must not reply to client */
 793                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 794
 795                         /* record the (massaged) matched
 796                          * DN into the reply structure */
 797                         rs->sr_matched = match;
 798                 }
 799         }
 800         if ( op->o_conn &&
 801                         ( ( sendok & LDAP_BACK_SENDOK )
 802                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
 803         {
 804                 send_ldap_result( op, rs );
 805         }
 806         if ( match ) {
 807                 if ( rs->sr_matched != match ) {
 808                         free( (char *)rs->sr_matched );
 809                 }
 810                 rs->sr_matched = NULL;
 811                 ldap_memfree( match );
 812         }
 813         if ( text ) {
 814                 ldap_memfree( text );
 815         }
 816         rs->sr_text = NULL;
 817         return( ERR_OK( rs->sr_err ) ? 0 : -1 );
 818 }
 819
 820 /* return true if bound, false if failed */
 821 int
 822 ldap_back_retry( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 823 {
 824         int             rc = 0;
 825         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 826
 827 retry_lock:;
 828         switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 829         case LDAP_PVT_THREAD_EBUSY:
 830         default:
 831                 ldap_pvt_thread_yield();
 832                 goto retry_lock;
 833
 834         case 0:
 835                 break;
 836         }
 837
 838         if ( lc->lc_refcnt == 1 ) {
 839                 ldap_pvt_thread_mutex_lock( &lc->lc_mutex );
 840                 ldap_unbind_ext_s( lc->lc_ld, NULL, NULL );
 841                 lc->lc_ld = NULL;
 842                 lc->lc_bound = 0;
 843
 844                 /* lc here must be the regular lc, reset and ready for init */
 845                 rc = ldap_back_prepare_conn( &lc, op, rs, sendok );
 846                 if ( rc == LDAP_SUCCESS ) {
 847                         rc = ldap_back_dobind_int( lc, op, rs, sendok, 0 );
 848                 }
 849                 ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 850         }
 851
 852         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 853
 854         return rc;
 855 }
 856
 857 static int
 858 ldap_back_proxy_authz_bind( struct ldapconn *lc, Operation *op, SlapReply *rs )
 859 {
 860         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 861         struct berval   binddn = slap_empty_bv;
 862         struct berval   bindcred = slap_empty_bv;
 863         int             dobind = 0;
 864         int             msgid;
 865         int             rc;
 866
 867         /*
 868          * FIXME: we need to let clients use proxyAuthz
 869          * otherwise we cannot do symmetric pools of servers;
 870          * we have to live with the fact that a user can
 871          * authorize itself as any ID that is allowed
 872          * by the authzTo directive of the "proxyauthzdn".
 873          */
 874         /*
 875          * NOTE: current Proxy Authorization specification
 876          * and implementation do not allow proxy authorization
 877          * control to be provided with Bind requests
 878          */
 879         /*
 880          * if no bind took place yet, but the connection is bound
 881          * and the "proxyauthzdn" is set, then bind as
 882          * "proxyauthzdn" and explicitly add the proxyAuthz
 883          * control to every operation with the dn bound
 884          * to the connection as control value.
 885          */
 886
 887         /* bind as proxyauthzdn only if no idassert mode
 888          * is requested, or if the client's identity
 889          * is authorized */
 890         switch ( li->idassert_mode ) {
 891         case LDAP_BACK_IDASSERT_LEGACY:
 892                 if ( !BER_BVISNULL( &op->o_conn->c_ndn ) && !BER_BVISEMPTY( &op->o_conn->c_ndn ) ) {
 893                         if ( !BER_BVISNULL( &li->idassert_authcDN ) && !BER_BVISEMPTY( &li->idassert_authcDN ) )
 894                         {
 895                                 binddn = li->idassert_authcDN;
 896                                 bindcred = li->idassert_passwd;
 897                                 dobind = 1;
 898                         }
 899                 }
 900                 break;
 901
 902         default:
 903                 /* NOTE: rootdn can always idassert */
 904                 if ( li->idassert_authz && !be_isroot( op ) ) {
 905                         struct berval authcDN;
 906
 907                         if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
 908                                 authcDN = slap_empty_bv;
 909
 910                         } else {
 911                                 authcDN = op->o_conn->c_ndn;
 912                         }
 913                         rs->sr_err = slap_sasl_matches( op, li->idassert_authz,
 914                                         &authcDN, &authcDN );
 915                         if ( rs->sr_err != LDAP_SUCCESS ) {
 916                                 if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
 917                                         send_ldap_result( op, rs );
 918                                         lc->lc_bound = 0;
 919
 920                                 } else {
 921                                         rs->sr_err = LDAP_SUCCESS;
 922                                         binddn = slap_empty_bv;
 923                                         bindcred = slap_empty_bv;
 924                                         break;
 925                                 }
 926
 927                                 goto done;
 928                         }
 929                 }
 930
 931                 binddn = li->idassert_authcDN;
 932                 bindcred = li->idassert_passwd;
 933                 dobind = 1;
 934                 break;
 935         }
 936
 937         if ( dobind && li->idassert_authmethod == LDAP_AUTH_SASL ) {
 938 #ifdef HAVE_CYRUS_SASL
 939                 void            *defaults = NULL;
 940                 struct berval   authzID = BER_BVNULL;
 941                 int             freeauthz = 0;
 942
 943                 /* if SASL supports native authz, prepare for it */
 944                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
 945                                 ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
 946                 {
 947                         switch ( li->idassert_mode ) {
 948                         case LDAP_BACK_IDASSERT_OTHERID:
 949                         case LDAP_BACK_IDASSERT_OTHERDN:
 950                                 authzID = li->idassert_authzID;
 951                                 break;
 952
 953                         case LDAP_BACK_IDASSERT_ANONYMOUS:
 954                                 BER_BVSTR( &authzID, "dn:" );
 955                                 break;
 956
 957                         case LDAP_BACK_IDASSERT_SELF:
 958                                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
 959                                         /* connection is not authc'd, so don't idassert */
 960                                         BER_BVSTR( &authzID, "dn:" );
 961                                         break;
 962                                 }
 963                                 authzID.bv_len = STRLENOF( "dn:" ) + op->o_conn->c_ndn.bv_len;
 964                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
 965                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
 966                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
 967                                                 op->o_conn->c_ndn.bv_val, op->o_conn->c_ndn.bv_len + 1 );
 968                                 freeauthz = 1;
 969                                 break;
 970
 971                         default:
 972                                 break;
 973                         }
 974                 }
 975
 976 #if 0   /* will deal with this later... */
 977                 if ( sasl_secprops != NULL ) {
 978                         rs->sr_err = ldap_set_option( lc->lc_ld, LDAP_OPT_X_SASL_SECPROPS,
 979                                 (void *) sasl_secprops );
 980
 981                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
 982                                 send_ldap_result( op, rs );
 983                                 lc->lc_bound = 0;
 984                                 goto done;
 985                         }
 986                 }
 987 #endif
 988
 989                 defaults = lutil_sasl_defaults( lc->lc_ld,
 990                                 li->idassert_sasl_mech.bv_val,
 991                                 li->idassert_sasl_realm.bv_val,
 992                                 li->idassert_authcID.bv_val,
 993                                 li->idassert_passwd.bv_val,
 994                                 authzID.bv_val );
 995
 996                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
 997                                 li->idassert_sasl_mech.bv_val, NULL, NULL,
 998                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 999                                 defaults );
1000
1001                 lutil_sasl_freedefs( defaults );
1002                 if ( freeauthz ) {
1003                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1004                 }
1005
1006                 rs->sr_err = slap_map_api2result( rs );
1007                 if ( rs->sr_err != LDAP_SUCCESS ) {
1008                         lc->lc_bound = 0;
1009                         send_ldap_result( op, rs );
1010
1011                 } else {
1012                         lc->lc_bound = 1;
1013                 }
1014                 goto done;
1015 #endif /* HAVE_CYRUS_SASL */
1016         }
1017
1018         switch ( li->idassert_authmethod ) {
1019         case LDAP_AUTH_SIMPLE:
1020                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1021                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1022                                 &bindcred, NULL, NULL, &msgid );
1023                 break;
1024
1025         case LDAP_AUTH_NONE:
1026                 lc->lc_bound = 1;
1027                 goto done;
1028
1029         default:
1030                 /* unsupported! */
1031                 lc->lc_bound = 0;
1032                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1033                 send_ldap_result( op, rs );
1034                 goto done;
1035         }
1036
1037         rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_SENDERR );
1038         if ( rc == LDAP_SUCCESS ) {
1039                 lc->lc_bound = 1;
1040         }
1041 done:;
1042         return lc->lc_bound;
1043 }
1044
1045 /*
1046  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1047  * to existing server-side controls if required; if not,
1048  * the existing server-side controls are placed in *pctrls.
1049  * The caller, after using the controls in client API
1050  * operations, if ( *pctrls != op->o_ctrls ), should
1051  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1052  * The function returns success if the control could
1053  * be added if required, or if it did nothing; in the future,
1054  * it might return some error if it failed.
1055  *
1056  * if no bind took place yet, but the connection is bound
1057  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1058  * and explicitly add proxyAuthz the control to every operation
1059  * with the dn bound to the connection as control value.
1060  *
1061  * If no server-side controls are defined for the operation,
1062  * simply add the proxyAuthz control; otherwise, if the
1063  * proxyAuthz control is not already set, add it as
1064  * the first one
1065  *
1066  * FIXME: is controls order significant for security?
1067  * ANSWER: controls ordering and interoperability
1068  * must be indicated by the specs of each control; if none
1069  * is specified, the order is irrelevant.
1070  */
1071 int
1072 ldap_back_proxy_authz_ctrl(
1073                 struct ldapconn *lc,
1074                 Operation       *op,
1075                 SlapReply       *rs,
1076                 LDAPControl     ***pctrls )
1077 {
1078         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
1079         LDAPControl     **ctrls = NULL;
1080         int             i = 0,
1081                         mode;
1082         struct berval   assertedID;
1083
1084         *pctrls = NULL;
1085
1086         rs->sr_err = LDAP_SUCCESS;
1087
1088         if ( ( BER_BVISNULL( &li->idassert_authcID ) || BER_BVISEMPTY( &li->idassert_authcID ) )
1089                         && ( BER_BVISNULL( &li->idassert_authcDN ) || BER_BVISEMPTY( &li->idassert_authcDN ) ) ) {
1090                 goto done;
1091         }
1092
1093         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1094                 goto done;
1095         }
1096
1097         if ( li->idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1098                 if ( op->o_proxy_authz ) {
1099                         /*
1100                          * FIXME: we do not want to perform proxyAuthz
1101                          * on behalf of the client, because this would
1102                          * be performed with "proxyauthzdn" privileges.
1103                          *
1104                          * This might actually be too strict, since
1105                          * the "proxyauthzdn" authzTo, and each entry's
1106                          * authzFrom attributes may be crafted
1107                          * to avoid unwanted proxyAuthz to take place.
1108                          */
1109 #if 0
1110                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1111                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1112 #endif
1113                         goto done;
1114                 }
1115
1116                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1117                         goto done;
1118                 }
1119
1120                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1121                         goto done;
1122                 }
1123
1124                 if ( BER_BVISNULL( &li->idassert_authcDN ) ) {
1125                         goto done;
1126                 }
1127
1128         } else if ( li->idassert_authmethod == LDAP_AUTH_SASL ) {
1129                 if ( ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1130                                 /* && ( !BER_BVISNULL( &op->o_conn->c_ndn ) || lc->lc_bound ) */ )
1131                 {
1132                         /* already asserted in SASL via native authz */
1133                         /* NOTE: the test on lc->lc_bound is used to trap
1134                          * native authorization of anonymous users,
1135                          * since in that case op->o_conn->c_ndn is NULL */
1136                         goto done;
1137                 }
1138
1139         } else if ( li->idassert_authz && !be_isroot( op ) ) {
1140                 int             rc;
1141                 struct berval authcDN;
1142
1143                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1144                         authcDN = slap_empty_bv;
1145                 } else {
1146                         authcDN = op->o_conn->c_ndn;
1147                 }
1148                 rc = slap_sasl_matches( op, li->idassert_authz,
1149                                 &authcDN, & authcDN );
1150                 if ( rc != LDAP_SUCCESS ) {
1151                         if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1152                                 /* op->o_conn->c_ndn is not authorized
1153                                  * to use idassert */
1154                                 return rc;
1155                         }
1156                         return rs->sr_err;
1157                 }
1158         }
1159
1160         if ( op->o_proxy_authz ) {
1161                 /*
1162                  * FIXME: we can:
1163                  * 1) ignore the already set proxyAuthz control
1164                  * 2) leave it in place, and don't set ours
1165                  * 3) add both
1166                  * 4) reject the operation
1167                  *
1168                  * option (4) is very drastic
1169                  * option (3) will make the remote server reject
1170                  * the operation, thus being equivalent to (4)
1171                  * option (2) will likely break the idassert
1172                  * assumptions, so we cannot accept it;
1173                  * option (1) means that we are contradicting
1174                  * the client's reques.
1175                  *
1176                  * I think (4) is the only correct choice.
1177                  */
1178                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1179                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1180         }
1181
1182         if ( op->o_do_not_cache && op->o_is_auth_check ) {
1183                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1184
1185         } else {
1186                 mode = li->idassert_mode;
1187         }
1188
1189         switch ( mode ) {
1190         case LDAP_BACK_IDASSERT_LEGACY:
1191         case LDAP_BACK_IDASSERT_SELF:
1192                 /* original behavior:
1193                  * assert the client's identity */
1194                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1195                         assertedID = slap_empty_bv;
1196                 } else {
1197                         assertedID = op->o_conn->c_ndn;
1198                 }
1199                 break;
1200
1201         case LDAP_BACK_IDASSERT_ANONYMOUS:
1202                 /* assert "anonymous" */
1203                 assertedID = slap_empty_bv;
1204                 break;
1205
1206         case LDAP_BACK_IDASSERT_NOASSERT:
1207                 /* don't assert; bind as proxyauthzdn */
1208                 goto done;
1209
1210         case LDAP_BACK_IDASSERT_OTHERID:
1211         case LDAP_BACK_IDASSERT_OTHERDN:
1212                 /* assert idassert DN */
1213                 assertedID = li->idassert_authzID;
1214                 break;
1215
1216         default:
1217                 assert( 0 );
1218         }
1219
1220         if ( BER_BVISNULL( &assertedID ) ) {
1221                 assertedID = slap_empty_bv;
1222         }
1223
1224         if ( op->o_ctrls ) {
1225                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1226                         /* just count ctrls */ ;
1227         }
1228
1229         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
1230         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
1231
1232         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1233         ctrls[ 0 ]->ldctl_iscritical = 1;
1234
1235         switch ( li->idassert_mode ) {
1236         /* already in u:ID or dn:DN form */
1237         case LDAP_BACK_IDASSERT_OTHERID:
1238         case LDAP_BACK_IDASSERT_OTHERDN:
1239                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
1240                 break;
1241
1242         /* needs the dn: prefix */
1243         default:
1244                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1245                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
1246                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1247                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val + STRLENOF( "dn:" ),
1248                                 assertedID.bv_val, assertedID.bv_len + 1 );
1249                 break;
1250         }
1251
1252         if ( op->o_ctrls ) {
1253                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1254                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1255                 }
1256         }
1257         ctrls[ i + 1 ] = NULL;
1258
1259 done:;
1260         if ( ctrls == NULL ) {
1261                 ctrls = op->o_ctrls;
1262         }
1263
1264         *pctrls = ctrls;
1265
1266         return rs->sr_err;
1267 }
1268
1269 int
1270 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1271 {
1272         LDAPControl     **ctrls = *pctrls;
1273
1274         /* we assume that the first control is the proxyAuthz
1275          * added by back-ldap, so it's the only one we explicitly
1276          * free */
1277         if ( ctrls && ctrls != op->o_ctrls ) {
1278                 assert( ctrls[ 0 ] );
1279
1280                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1281                         free( ctrls[ 0 ]->ldctl_value.bv_val );
1282                 }
1283
1284                 free( ctrls[ 0 ] );
1285                 free( ctrls );
1286         }
1287
1288         *pctrls = NULL;
1289
1290         return 0;
1291 }