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 1999-2006 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 #ifndef PRINT_CONNTREE
  39 #define PRINT_CONNTREE 0
  40 #endif /* !PRINT_CONNTREE */
  41
  42 #define LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ       "2.16.840.1.113730.3.4.12"
  43
  44 static LDAP_REBIND_PROC ldap_back_default_rebind;
  45
  46 LDAP_REBIND_PROC        *ldap_back_rebind_f = ldap_back_default_rebind;
  47
  48 static int
  49 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  50
  51 static int
  52 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  53
  54 static int
  55 ldap_back_conndnlc_cmp( const void *c1, const void *c2 );
  56
  57 int
  58 ldap_back_bind( Operation *op, SlapReply *rs )
  59 {
  60         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
  61         ldapconn_t      *lc;
  62
  63         int rc = 0;
  64         ber_int_t msgid;
  65
  66         lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR );
  67         if ( !lc ) {
  68                 return rs->sr_err;
  69         }
  70
  71         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
  72                 ch_free( lc->lc_bound_ndn.bv_val );
  73                 BER_BVZERO( &lc->lc_bound_ndn );
  74         }
  75         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
  76
  77         /* method is always LDAP_AUTH_SIMPLE if we got here */
  78         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
  79                         LDAP_SASL_SIMPLE,
  80                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
  81         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
  82
  83         if ( rc == LDAP_SUCCESS ) {
  84                 /* If defined, proxyAuthz will be used also when
  85                  * back-ldap is the authorizing backend; for this
  86                  * purpose, a successful bind is followed by a
  87                  * bind with the configured identity assertion */
  88                 /* NOTE: use with care */
  89                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
  90                         ldap_back_proxy_authz_bind( lc, op, rs, LDAP_BACK_SENDERR );
  91                         if ( !LDAP_BACK_CONN_ISBOUND( lc ) ) {
  92                                 rc = 1;
  93                                 goto done;
  94                         }
  95                 }
  96
  97                 LDAP_BACK_CONN_ISBOUND_SET( lc );
  98                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
  99
 100                 if ( LDAP_BACK_SAVECRED( li ) ) {
 101                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
 102                                 memset( lc->lc_cred.bv_val, 0,
 103                                                 lc->lc_cred.bv_len );
 104                         }
 105                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
 106                         ldap_set_rebind_proc( lc->lc_ld, ldap_back_rebind_f, lc );
 107                 }
 108         }
 109 done:;
 110
 111         assert( lc->lc_binding == 1 );
 112         lc->lc_binding = 0;
 113
 114         /* must re-insert if local DN changed as result of bind */
 115         if ( !LDAP_BACK_CONN_ISBOUND( lc )
 116                 || ( LDAP_BACK_CONN_ISBOUND( lc )
 117                         && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) )
 118         {
 119                 int             lerr = -1;
 120                 ldapconn_t      *tmplc;
 121
 122                 /* wait for all other ops to release the connection */
 123 retry_lock:;
 124                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 125                 if ( lc->lc_refcnt > 1 ) {
 126                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 127                         ldap_pvt_thread_yield();
 128                         goto retry_lock;
 129                 }
 130
 131                 assert( lc->lc_refcnt == 1 );
 132                 tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 133                                 ldap_back_conndnlc_cmp );
 134                 assert( tmplc == NULL || lc == tmplc );
 135
 136                 if ( LDAP_BACK_CONN_ISBOUND( lc ) ) {
 137                         ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 138                         lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 139                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
 140                 }
 141
 142                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 143                 switch ( lerr ) {
 144                 case 0:
 145                         break;
 146
 147                 case -1:
 148                         /* duplicate; someone else successfully bound
 149                          * on the same connection with the same identity;
 150                          * we can do this because lc_refcnt == 1 */
 151                         ldap_back_conn_free( lc );
 152                         lc = NULL;
 153                 }
 154         }
 155
 156         if ( lc != NULL ) {
 157                 ldap_back_release_conn( op, rs, lc );
 158         }
 159
 160         return( rc );
 161 }
 162
 163 /*
 164  * ldap_back_conndn_cmp
 165  *
 166  * compares two ldapconn_t based on the value of the conn pointer
 167  * and of the local DN; used by avl stuff for insert, lookup
 168  * and direct delete
 169  */
 170 int
 171 ldap_back_conndn_cmp( const void *c1, const void *c2 )
 172 {
 173         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 174         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 175         int rc;
 176
 177         /* If local DNs don't match, it is definitely not a match */
 178         /* For shared sessions, conn is NULL. Only explicitly
 179          * bound sessions will have non-NULL conn.
 180          */
 181         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 182         if ( rc == 0 ) {
 183                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 184         }
 185
 186         return rc;
 187 }
 188
 189 /*
 190  * ldap_back_conndnlc_cmp
 191  *
 192  * compares two ldapconn_t based on the value of the conn pointer,
 193  * the local DN and the lc pointer; used by avl stuff for insert, lookup
 194  * and direct delete
 195  */
 196 static int
 197 ldap_back_conndnlc_cmp( const void *c1, const void *c2 )
 198 {
 199         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 200         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 201         int rc;
 202
 203         /* If local DNs don't match, it is definitely not a match */
 204         /* For shared sessions, conn is NULL. Only explicitly
 205          * bound sessions will have non-NULL conn.
 206          */
 207         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 208         if ( rc == 0 ) {
 209                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 210                 if ( rc == 0 ) {
 211                         rc = SLAP_PTRCMP( lc1, lc2 );
 212                 }
 213         }
 214
 215         return rc;
 216 }
 217
 218 /*
 219  * ldap_back_conn_cmp
 220  *
 221  * compares two ldapconn_t based on the value of the conn pointer;
 222  * used by avl stuff for delete of all conns with the same connid
 223  */
 224 int
 225 ldap_back_conn_cmp( const void *c1, const void *c2 )
 226 {
 227         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 228         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 229
 230         /* For shared sessions, conn is NULL. Only explicitly
 231          * bound sessions will have non-NULL conn.
 232          */
 233         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 234 }
 235
 236 /*
 237  * ldap_back_conndn_dup
 238  *
 239  * returns -1 in case a duplicate ldapconn_t has been inserted;
 240  * used by avl stuff
 241  */
 242 int
 243 ldap_back_conndn_dup( void *c1, void *c2 )
 244 {
 245         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 246         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 247
 248         /* Cannot have more than one shared session with same DN */
 249         if ( lc1->lc_conn == lc2->lc_conn &&
 250                 dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) )
 251         {
 252                 return -1;
 253         }
 254
 255         return 0;
 256 }
 257
 258 #if PRINT_CONNTREE > 0
 259 static void
 260 ravl_print( Avlnode *root, int depth )
 261 {
 262         int             i;
 263         ldapconn_t      *lc;
 264
 265         if ( root == 0 ) {
 266                 return;
 267         }
 268
 269         ravl_print( root->avl_right, depth+1 );
 270
 271         for ( i = 0; i < depth; i++ ) {
 272                 fprintf( stderr, "-" );
 273         }
 274
 275         lc = root->avl_data;
 276         fprintf( stderr, "lc=%p local=\"%s\" conn=%p %s refcnt=%d\n",
 277                 (void *)lc, lc->lc_local_ndn.bv_val, (void *)lc->lc_conn,
 278                 avl_bf2str( root->avl_bf ), lc->lc_refcnt );
 279
 280         ravl_print( root->avl_left, depth+1 );
 281 }
 282
 283 static void
 284 myprint( Avlnode *root )
 285 {
 286         fprintf( stderr, "========>\n" );
 287
 288         if ( root == 0 ) {
 289                 fprintf( stderr, "\tNULL\n" );
 290
 291         } else {
 292                 ravl_print( root, 0 );
 293         }
 294
 295         fprintf( stderr, "<========\n" );
 296 }
 297 #endif /* PRINT_CONNTREE */
 298
 299 int
 300 ldap_back_freeconn( Operation *op, ldapconn_t *lc, int dolock )
 301 {
 302         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 303         ldapconn_t      *tmplc;
 304
 305         if ( dolock ) {
 306                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 307         }
 308
 309         tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 310                         ldap_back_conndnlc_cmp );
 311         assert( LDAP_BACK_CONN_TAINTED( lc ) || tmplc == lc );
 312         if ( lc->lc_refcnt == 0 ) {
 313                 ldap_back_conn_free( (void *)lc );
 314         }
 315
 316         if ( dolock ) {
 317                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 318         }
 319
 320         return 0;
 321 }
 322
 323 #ifdef HAVE_TLS
 324 static int
 325 ldap_back_start_tls(
 326         LDAP            *ld,
 327         int             protocol,
 328         int             *is_tls,
 329         const char      *url,
 330         unsigned        flags,
 331         int             retries,
 332         const char      **text )
 333 {
 334         int             rc = LDAP_SUCCESS;
 335         ldapinfo_t      dummy;
 336
 337         /* this is ridiculous... */
 338         dummy.li_flags = flags;
 339
 340         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 341         if ( ( LDAP_BACK_USE_TLS( &dummy ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &dummy ) ) )
 342                                 && !ldap_is_ldaps_url( url ) )
 343         {
 344 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 345                 /*
 346                  * use asynchronous StartTLS
 347                  * in case, chase referral (not implemented yet)
 348                  */
 349                 int             msgid;
 350
 351                 if ( protocol == 0 ) {
 352                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 353                                         (void *)&protocol );
 354                 }
 355
 356                 if ( protocol < LDAP_VERSION3 ) {
 357                         /* we should rather bail out... */
 358                         rc = LDAP_UNWILLING_TO_PERFORM;
 359                         *text = "invalid protocol version";
 360                 }
 361
 362                 if ( rc == LDAP_SUCCESS ) {
 363                         rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 364                 }
 365
 366                 if ( rc == LDAP_SUCCESS ) {
 367                         LDAPMessage     *res = NULL;
 368                         struct timeval  tv;
 369
 370                         LDAP_BACK_TV_SET( &tv );
 371
 372 retry:;
 373                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 374                         if ( rc < 0 ) {
 375                                 rc = LDAP_UNAVAILABLE;
 376
 377                         } else if ( rc == 0 ) {
 378                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 379                                         ldap_pvt_thread_yield();
 380                                         if ( retries > 0 ) {
 381                                                 retries--;
 382                                         }
 383                                         LDAP_BACK_TV_SET( &tv );
 384                                         goto retry;
 385                                 }
 386                                 rc = LDAP_UNAVAILABLE;
 387
 388                         } else if ( rc == LDAP_RES_EXTENDED ) {
 389                                 struct berval   *data = NULL;
 390
 391                                 rc = ldap_parse_extended_result( ld, res,
 392                                                 NULL, &data, 0 );
 393                                 if ( rc == LDAP_SUCCESS ) {
 394                                         int err;
 395                                         rc = ldap_parse_result( ld, res, &err,
 396                                                 NULL, NULL, NULL, NULL, 1 );
 397                                         if ( rc == LDAP_SUCCESS ) {
 398                                                 rc = err;
 399                                         }
 400                                         res = NULL;
 401
 402                                         /* FIXME: in case a referral
 403                                          * is returned, should we try
 404                                          * using it instead of the
 405                                          * configured URI? */
 406                                         if ( rc == LDAP_SUCCESS ) {
 407                                                 rc = ldap_install_tls( ld );
 408
 409                                         } else if ( rc == LDAP_REFERRAL ) {
 410                                                 rc = LDAP_UNWILLING_TO_PERFORM;
 411                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 412                                         }
 413
 414                                         if ( data ) {
 415                                                 if ( data->bv_val ) {
 416                                                         ber_memfree( data->bv_val );
 417                                                 }
 418                                                 ber_memfree( data );
 419                                         }
 420                                 }
 421
 422                         } else {
 423                                 rc = LDAP_OTHER;
 424                         }
 425
 426                         if ( res != NULL ) {
 427                                 ldap_msgfree( res );
 428                         }
 429                 }
 430 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 431                 /*
 432                  * use synchronous StartTLS
 433                  */
 434                 rc = ldap_start_tls_s( ld, NULL, NULL );
 435 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 436
 437                 /* if StartTLS is requested, only attempt it if the URL
 438                  * is not "ldaps://"; this may occur not only in case
 439                  * of misconfiguration, but also when used in the chain
 440                  * overlay, where the "uri" can be parsed out of a referral */
 441                 switch ( rc ) {
 442                 case LDAP_SUCCESS:
 443                         *is_tls = 1;
 444                         break;
 445
 446                 case LDAP_SERVER_DOWN:
 447                         break;
 448
 449                 default:
 450                         if ( LDAP_BACK_TLS_CRITICAL( &dummy ) ) {
 451                                 *text = "could not start TLS";
 452                                 break;
 453                         }
 454
 455                         /* in case Start TLS is not critical */
 456                         *is_tls = 0;
 457                         rc = LDAP_SUCCESS;
 458                         break;
 459                 }
 460
 461         } else {
 462                 *is_tls = 0;
 463         }
 464
 465         return rc;
 466 }
 467 #endif /* HAVE_TLS */
 468
 469 static int
 470 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 471 {
 472         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 473         int             version;
 474         LDAP            *ld = NULL;
 475 #ifdef HAVE_TLS
 476         int             is_tls = op->o_conn->c_is_tls;
 477 #endif /* HAVE_TLS */
 478
 479         assert( lcp != NULL );
 480
 481         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 482         if ( rs->sr_err != LDAP_SUCCESS ) {
 483                 goto error_return;
 484         }
 485
 486         /* Set LDAP version. This will always succeed: If the client
 487          * bound with a particular version, then so can we.
 488          */
 489         if ( li->li_version != 0 ) {
 490                 version = li->li_version;
 491
 492         } else if ( op->o_protocol != 0 ) {
 493                 version = op->o_protocol;
 494
 495         } else {
 496                 /* assume it's an internal op; set to LDAPv3 */
 497                 version = LDAP_VERSION3;
 498         }
 499         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&version );
 500
 501         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 502         ldap_set_option( ld, LDAP_OPT_REFERRALS,
 503                 LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 504
 505         if ( li->li_network_timeout > 0 ) {
 506                 struct timeval          tv;
 507
 508                 tv.tv_sec = li->li_network_timeout;
 509                 tv.tv_usec = 0;
 510                 ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
 511         }
 512
 513 #ifdef HAVE_TLS
 514         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 515                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 516         if ( rs->sr_err != LDAP_SUCCESS ) {
 517                 ldap_unbind_ext( ld, NULL, NULL );
 518                 goto error_return;
 519         }
 520 #endif /* HAVE_TLS */
 521
 522         if ( *lcp == NULL ) {
 523                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 524                 (*lcp)->lc_flags= li->li_flags;
 525         }
 526         (*lcp)->lc_ld = ld;
 527         (*lcp)->lc_refcnt = 1;
 528         (*lcp)->lc_binding = 1;
 529 #ifdef HAVE_TLS
 530         if ( is_tls ) {
 531                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 532         } else {
 533                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 534         }
 535 #endif /* HAVE_TLS */
 536
 537 error_return:;
 538         if ( rs->sr_err != LDAP_SUCCESS ) {
 539                 rs->sr_err = slap_map_api2result( rs );
 540                 if ( sendok & LDAP_BACK_SENDERR ) {
 541                         if ( rs->sr_text == NULL ) {
 542                                 rs->sr_text = "ldap_initialize() failed";
 543                         }
 544                         send_ldap_result( op, rs );
 545                         rs->sr_text = NULL;
 546                 }
 547
 548         } else {
 549                 if ( li->li_conn_ttl > 0 ) {
 550                         (*lcp)->lc_create_time = op->o_time;
 551                 }
 552         }
 553
 554         return rs->sr_err;
 555 }
 556
 557 ldapconn_t *
 558 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 559 {
 560         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 561         ldapconn_t      *lc = NULL,
 562                         lc_curr = { 0 };
 563         int             refcnt = 1, binding = 1;
 564
 565         /* Internal searches are privileged and shared. So is root. */
 566         if ( op->o_do_not_cache || be_isroot( op ) ) {
 567                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 568                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 569                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 570
 571         } else {
 572                 lc_curr.lc_local_ndn = op->o_ndn;
 573                 /* Explicit binds must not be shared */
 574                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 575                         lc_curr.lc_conn = op->o_conn;
 576
 577                 } else {
 578                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 579                 }
 580         }
 581
 582         /* Explicit Bind requests always get their own conn */
 583         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 584                 /* Searches for a ldapconn in the avl tree */
 585 retry_lock:
 586                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 587
 588                 lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 589                                 (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 590                 if ( lc != NULL ) {
 591                         /* Don't reuse connections while they're still binding */
 592                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 593                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 594                                 ldap_pvt_thread_yield();
 595                                 goto retry_lock;
 596                         }
 597                         refcnt = ++lc->lc_refcnt;
 598                         binding = ++lc->lc_binding;
 599                 }
 600                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 601         }
 602
 603         /* Looks like we didn't get a bind. Open a new session... */
 604         if ( lc == NULL ) {
 605                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 606                         return NULL;
 607                 }
 608                 if ( sendok & LDAP_BACK_BINDING ) {
 609                         LDAP_BACK_CONN_BINDING_SET( lc );
 610                 }
 611                 lc->lc_conn = lc_curr.lc_conn;
 612                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 613
 614                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 615                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 616                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 617                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 618
 619                 } else {
 620                         BER_BVZERO( &lc->lc_cred );
 621                         BER_BVZERO( &lc->lc_bound_ndn );
 622 #if 0
 623                         /* FIXME: if we set lc_bound_ndn = o_ndn
 624                          * we end up with a bind with DN but no password! */
 625                         if ( !BER_BVISEMPTY( &op->o_ndn )
 626                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 627                         {
 628                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 629                         }
 630 #endif
 631                 }
 632
 633 #ifdef HAVE_TLS
 634                 /* if start TLS failed but it was not mandatory,
 635                  * check if the non-TLS connection was already
 636                  * in cache; in case, destroy the newly created
 637                  * connection and use the existing one */
 638                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 639                                 && !ldap_tls_inplace( lc->lc_ld ) )
 640                 {
 641                         ldapconn_t *tmplc;
 642
 643                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 644                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 645                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 646                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 647                         if ( tmplc != NULL ) {
 648                                 refcnt = ++tmplc->lc_refcnt;
 649                                 binding = ++tmplc->lc_binding;
 650                                 ldap_back_conn_free( lc );
 651                                 lc = tmplc;
 652                         }
 653                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 654
 655                         if ( tmplc != NULL ) {
 656                                 goto done;
 657                         }
 658                 }
 659 #endif /* HAVE_TLS */
 660
 661                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 662
 663                 /* Inserts the newly created ldapconn in the avl tree */
 664                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 665
 666                 assert( lc->lc_refcnt == 1 );
 667                 assert( lc->lc_binding == 1 );
 668                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 669                         ldap_back_conndn_cmp, ldap_back_conndn_dup );
 670
 671 #if PRINT_CONNTREE > 0
 672                 myprint( li->li_conninfo.lai_tree );
 673 #endif /* PRINT_CONNTREE */
 674
 675                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 676
 677                 Debug( LDAP_DEBUG_TRACE,
 678                         "=>ldap_back_getconn: conn %p inserted refcnt=%u binding=%u\n",
 679                         (void *)lc, refcnt, binding );
 680
 681                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 682                 switch ( rs->sr_err ) {
 683                 case 0:
 684                         break;
 685
 686                 case -1:
 687                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 688                                 /* duplicate: free and try to get the newly created one */
 689                                 goto retry_lock;
 690                         }
 691                         /* taint connection, so that it'll be freed when released */
 692                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 693                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 694                                         ldap_back_conndnlc_cmp );
 695                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 696                         LDAP_BACK_CONN_TAINTED_SET( lc );
 697                         break;
 698
 699                 default:
 700                         ldap_back_conn_free( lc );
 701                         rs->sr_err = LDAP_OTHER;
 702                         rs->sr_text = "proxy bind collision";
 703                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 704                                 send_ldap_result( op, rs );
 705                                 rs->sr_text = NULL;
 706                         }
 707                         return NULL;
 708                 }
 709
 710         } else {
 711                 char    buf[ SLAP_TEXT_BUFLEN ];
 712                 int     expiring = 0;
 713
 714                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
 715                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
 716                 {
 717                         expiring = 1;
 718
 719                         /* let it be used, but taint/delete it so that
 720                          * no-one else can look it up any further */
 721                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 722                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 723                                         ldap_back_conndnlc_cmp );
 724                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 725                         LDAP_BACK_CONN_TAINTED_SET( lc );
 726                 }
 727
 728                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 729                         snprintf( buf, sizeof( buf ),
 730                                 "conn %p fetched refcnt=%u binding=%u%s",
 731                                 (void *)lc, refcnt, binding, expiring ? " expiring" : "" );
 732                         Debug( LDAP_DEBUG_TRACE,
 733                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
 734                 }
 735         }
 736
 737         if ( li->li_idle_timeout && lc ) {
 738                 lc->lc_time = op->o_time;
 739         }
 740
 741 done:;
 742         return lc;
 743 }
 744
 745 void
 746 ldap_back_release_conn_lock(
 747         Operation               *op,
 748         SlapReply               *rs,
 749         ldapconn_t              *lc,
 750         int                     dolock )
 751 {
 752         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 753
 754         if ( dolock ) {
 755                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 756         }
 757         assert( lc->lc_refcnt > 0 );
 758         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 759         lc->lc_refcnt--;
 760         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
 761                 ldap_back_freeconn( op, lc, 0 );
 762         }
 763         if ( dolock ) {
 764                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 765         }
 766 }
 767
 768 /*
 769  * ldap_back_dobind
 770  *
 771  * Note: as the check for the value of lc->lc_bound was already here, I removed
 772  * it from all the callers, and I made the function return the flag, so
 773  * it can be used to simplify the check.
 774  *
 775  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 776  */
 777 static int
 778 ldap_back_dobind_int(
 779         ldapconn_t              *lc,
 780         Operation               *op,
 781         SlapReply               *rs,
 782         ldap_back_send_t        sendok,
 783         int                     retries,
 784         int                     dolock )
 785 {
 786         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 787
 788         int             rc, binding = 0;
 789         ber_int_t       msgid;
 790
 791         assert( retries >= 0 );
 792
 793 retry_lock:;
 794         if ( dolock ) {
 795                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 796         }
 797
 798         if ( binding == 0 ) {
 799                 /* check if already bound */
 800                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 801                 if ( rc ) {
 802                         lc->lc_binding--;
 803                         if ( dolock ) {
 804                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 805                         }
 806                         return rc;
 807                 }
 808
 809                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 810                         /* if someone else is about to bind it, give up and retry */
 811                         if ( dolock ) {
 812                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 813                         }
 814                         ldap_pvt_thread_yield();
 815                         goto retry_lock;
 816
 817                 } else {
 818                         /* otherwise this thread will bind it */
 819                         LDAP_BACK_CONN_BINDING_SET( lc );
 820                         binding = 1;
 821                 }
 822         }
 823
 824         /* wait for pending operations to finish */
 825         /* FIXME: may become a bottleneck! */
 826         if ( lc->lc_refcnt != lc->lc_binding ) {
 827                 if ( dolock ) {
 828                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 829                 }
 830                 ldap_pvt_thread_yield();
 831                 goto retry_lock;
 832         }
 833
 834         if ( dolock ) {
 835                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 836         }
 837
 838 #if 0
 839         while ( lc->lc_refcnt > 1 ) {
 840                 ldap_pvt_thread_yield();
 841                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 842                 if ( rc ) {
 843                         return rc;
 844                 }
 845         }
 846
 847         if ( dolock ) {
 848                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 849         }
 850         LDAP_BACK_CONN_BINDING_SET( lc );
 851         if ( dolock ) {
 852                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 853         }
 854 #endif
 855
 856         /*
 857          * FIXME: we need to let clients use proxyAuthz
 858          * otherwise we cannot do symmetric pools of servers;
 859          * we have to live with the fact that a user can
 860          * authorize itself as any ID that is allowed
 861          * by the authzTo directive of the "proxyauthzdn".
 862          */
 863         /*
 864          * NOTE: current Proxy Authorization specification
 865          * and implementation do not allow proxy authorization
 866          * control to be provided with Bind requests
 867          */
 868         /*
 869          * if no bind took place yet, but the connection is bound
 870          * and the "idassert-authcDN" (or other ID) is set,
 871          * then bind as the asserting identity and explicitly
 872          * add the proxyAuthz control to every operation with the
 873          * dn bound to the connection as control value.
 874          * This is done also if this is the authrizing backend,
 875          * but the "override" flag is given to idassert.
 876          * It allows to use SASL bind and yet proxyAuthz users
 877          */
 878         if ( op->o_conn != NULL &&
 879                         !op->o_do_not_cache &&
 880                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 881                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 882         {
 883                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok );
 884                 goto done;
 885         }
 886
 887 #ifdef HAVE_CYRUS_SASL
 888         if ( LDAP_BACK_CONN_ISPRIV( lc )
 889                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 890         {
 891                 void            *defaults = NULL;
 892
 893                 if ( li->li_acl_secprops != NULL ) {
 894                         rc = ldap_set_option( lc->lc_ld,
 895                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 896
 897                         if ( rc != LDAP_OPT_SUCCESS ) {
 898                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 899                                         "(%s,SECPROPS,\"%s\") failed!\n",
 900                                         li->li_uri, li->li_acl_secprops, 0 );
 901                                 goto done;
 902                         }
 903                 }
 904
 905                 defaults = lutil_sasl_defaults( lc->lc_ld,
 906                                 li->li_acl_sasl_mech.bv_val,
 907                                 li->li_acl_sasl_realm.bv_val,
 908                                 li->li_acl_authcID.bv_val,
 909                                 li->li_acl_passwd.bv_val,
 910                                 NULL );
 911
 912                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 913                                 li->li_acl_authcDN.bv_val,
 914                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 915                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 916                                 defaults );
 917
 918                 lutil_sasl_freedefs( defaults );
 919
 920                 rs->sr_err = slap_map_api2result( rs );
 921                 if ( rs->sr_err != LDAP_SUCCESS ) {
 922                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 923                         send_ldap_result( op, rs );
 924
 925                 } else {
 926                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 927                 }
 928                 goto done;
 929         }
 930 #endif /* HAVE_CYRUS_SASL */
 931
 932 retry:;
 933         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 934                         lc->lc_bound_ndn.bv_val,
 935                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 936                         NULL, NULL, &msgid );
 937
 938         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 939                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 940                         if ( dolock ) {
 941                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 942                         }
 943
 944                         assert( lc->lc_refcnt > 0 );
 945                         if ( lc->lc_refcnt == 1 ) {
 946                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 947                                 lc->lc_ld = NULL;
 948
 949                                 /* lc here must be the regular lc, reset and ready for init */
 950                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 951                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 952                                         lc->lc_binding--;
 953                                         lc->lc_refcnt = 0;
 954                                 }
 955                         }
 956
 957                         if ( dolock ) {
 958                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 959                         }
 960
 961                         if ( rs->sr_err == LDAP_SUCCESS ) {
 962                                 if ( retries > 0 ) {
 963                                         retries--;
 964                                 }
 965                                 goto retry;
 966                         }
 967
 968                 } else {
 969                         if ( dolock ) {
 970                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 971                         }
 972                         lc->lc_binding--;
 973                         if ( dolock ) {
 974                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 975                         }
 976                 }
 977
 978                 ldap_back_freeconn( op, lc, dolock );
 979                 rs->sr_err = slap_map_api2result( rs );
 980
 981                 return 0;
 982         }
 983
 984         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
 985         if ( rc == LDAP_SUCCESS ) {
 986                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 987         }
 988
 989 done:;
 990         lc->lc_binding--;
 991         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 992         rc = LDAP_BACK_CONN_ISBOUND( lc );
 993         if ( !rc ) {
 994                 ldap_back_release_conn_lock( op, rs, lc, dolock );
 995         }
 996
 997         return rc;
 998 }
 999
1000 int
1001 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1002 {
1003         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1004
1005         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
1006 }
1007
1008 /*
1009  * ldap_back_default_rebind
1010  *
1011  * This is a callback used for chasing referrals using the same
1012  * credentials as the original user on this session.
1013  */
1014 static int
1015 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1016         ber_int_t msgid, void *params )
1017 {
1018         ldapconn_t      *lc = (ldapconn_t *)params;
1019
1020 #ifdef HAVE_TLS
1021         /* ... otherwise we couldn't get here */
1022         assert( lc != NULL );
1023
1024         if ( !ldap_tls_inplace( ld ) ) {
1025                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1026                                 rc;
1027                 const char      *text = NULL;
1028
1029                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1030                         LDAP_BACK_RETRY_DEFAULT, &text );
1031                 if ( rc != LDAP_SUCCESS ) {
1032                         return rc;
1033                 }
1034         }
1035 #endif /* HAVE_TLS */
1036
1037         /* FIXME: add checks on the URL/identity? */
1038
1039         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
1040                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1041 }
1042
1043 int
1044 ldap_back_op_result(
1045                 ldapconn_t              *lc,
1046                 Operation               *op,
1047                 SlapReply               *rs,
1048                 ber_int_t               msgid,
1049                 time_t                  timeout,
1050                 ldap_back_send_t        sendok )
1051 {
1052         char            *match = NULL;
1053         LDAPMessage     *res = NULL;
1054         char            *text = NULL;
1055
1056 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1057
1058         rs->sr_text = NULL;
1059         rs->sr_matched = NULL;
1060
1061         /* if the error recorded in the reply corresponds
1062          * to a successful state, get the error from the
1063          * remote server response */
1064         if ( ERR_OK( rs->sr_err ) ) {
1065                 int             rc;
1066                 struct timeval  tv;
1067
1068                 if ( timeout ) {
1069                         tv.tv_sec = timeout;
1070                         tv.tv_usec = 0;
1071
1072                 } else {
1073                         LDAP_BACK_TV_SET( &tv );
1074                 }
1075
1076 retry:;
1077                 /* if result parsing fails, note the failure reason */
1078                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1079                 switch ( rc ) {
1080                 case 0:
1081                         if ( timeout ) {
1082                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1083                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
1084                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
1085                                 rs->sr_text = "Operation timed out";
1086                                 break;
1087                         }
1088
1089                         LDAP_BACK_TV_SET( &tv );
1090                         ldap_pvt_thread_yield();
1091                         goto retry;
1092
1093                 case -1:
1094                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1095                                         &rs->sr_err );
1096                         break;
1097
1098
1099                 /* otherwise get the result; if it is not
1100                  * LDAP_SUCCESS, record it in the reply
1101                  * structure (this includes
1102                  * LDAP_COMPARE_{TRUE|FALSE}) */
1103                 default:
1104                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1105                                         &match, &text, NULL, NULL, 1 );
1106                         rs->sr_text = text;
1107                         if ( rc != LDAP_SUCCESS ) {
1108                                 rs->sr_err = rc;
1109                         }
1110                 }
1111         }
1112
1113         /* if the error in the reply structure is not
1114          * LDAP_SUCCESS, try to map it from client
1115          * to server error */
1116         if ( !ERR_OK( rs->sr_err ) ) {
1117                 rs->sr_err = slap_map_api2result( rs );
1118
1119                 /* internal ops ( op->o_conn == NULL )
1120                  * must not reply to client */
1121                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1122
1123                         /* record the (massaged) matched
1124                          * DN into the reply structure */
1125                         rs->sr_matched = match;
1126                 }
1127         }
1128         if ( op->o_conn &&
1129                         ( ( sendok & LDAP_BACK_SENDOK )
1130                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1131         {
1132                 send_ldap_result( op, rs );
1133         }
1134         if ( match ) {
1135                 if ( rs->sr_matched != match ) {
1136                         free( (char *)rs->sr_matched );
1137                 }
1138                 rs->sr_matched = NULL;
1139                 ldap_memfree( match );
1140         }
1141         if ( text ) {
1142                 ldap_memfree( text );
1143         }
1144         rs->sr_text = NULL;
1145         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1146 }
1147
1148 /* return true if bound, false if failed */
1149 int
1150 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1151 {
1152         int             rc = 0;
1153         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1154
1155         assert( lcp != NULL );
1156         assert( *lcp != NULL );
1157
1158         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1159
1160         if ( (*lcp)->lc_refcnt == 1 ) {
1161                 Debug( LDAP_DEBUG_ANY,
1162                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1163                         op->o_log_prefix, li->li_uri,
1164                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1165                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1166
1167                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1168                 (*lcp)->lc_ld = NULL;
1169                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1170
1171                 /* lc here must be the regular lc, reset and ready for init */
1172                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1173                 if ( rc != LDAP_SUCCESS ) {
1174                         rc = 0;
1175                         *lcp = NULL;
1176
1177                 } else {
1178                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1179                         if ( rc == 0 ) {
1180                                 *lcp = NULL;
1181                         }
1182                 }
1183
1184         } else {
1185                 Debug( LDAP_DEBUG_TRACE,
1186                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1187                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1188
1189                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1190                 *lcp = NULL;
1191
1192                 if ( sendok ) {
1193                         rs->sr_err = LDAP_UNAVAILABLE;
1194                         rs->sr_text = "unable to retry";
1195                         send_ldap_result( op, rs );
1196                 }
1197         }
1198
1199         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1200
1201         return rc;
1202 }
1203
1204 static int
1205 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1206 {
1207         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1208         struct berval   binddn = slap_empty_bv;
1209         struct berval   bindcred = slap_empty_bv;
1210         struct berval   ndn;
1211         int             dobind = 0;
1212         int             msgid;
1213         int             rc;
1214
1215         /* don't proxyAuthz if protocol is not LDAPv3 */
1216         switch ( li->li_version ) {
1217         case LDAP_VERSION3:
1218                 break;
1219
1220         case 0:
1221                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1222                         break;
1223                 }
1224                 /* fall thru */
1225
1226         default:
1227                 goto done;
1228         }
1229
1230         if ( op->o_tag == LDAP_REQ_BIND ) {
1231                 ndn = op->o_req_ndn;
1232
1233         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1234                 ndn = op->o_conn->c_ndn;
1235
1236         } else {
1237                 ndn = op->o_ndn;
1238         }
1239
1240         /*
1241          * FIXME: we need to let clients use proxyAuthz
1242          * otherwise we cannot do symmetric pools of servers;
1243          * we have to live with the fact that a user can
1244          * authorize itself as any ID that is allowed
1245          * by the authzTo directive of the "proxyauthzdn".
1246          */
1247         /*
1248          * NOTE: current Proxy Authorization specification
1249          * and implementation do not allow proxy authorization
1250          * control to be provided with Bind requests
1251          */
1252         /*
1253          * if no bind took place yet, but the connection is bound
1254          * and the "proxyauthzdn" is set, then bind as
1255          * "proxyauthzdn" and explicitly add the proxyAuthz
1256          * control to every operation with the dn bound
1257          * to the connection as control value.
1258          */
1259
1260         /* bind as proxyauthzdn only if no idassert mode
1261          * is requested, or if the client's identity
1262          * is authorized */
1263         switch ( li->li_idassert_mode ) {
1264         case LDAP_BACK_IDASSERT_LEGACY:
1265                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1266                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1267                         {
1268                                 binddn = li->li_idassert_authcDN;
1269                                 bindcred = li->li_idassert_passwd;
1270                                 dobind = 1;
1271                         }
1272                 }
1273                 break;
1274
1275         default:
1276                 /* NOTE: rootdn can always idassert */
1277                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1278                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1279                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1280                                 if ( sendok & LDAP_BACK_SENDERR ) {
1281                                         send_ldap_result( op, rs );
1282                                 }
1283                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1284
1285                         } else {
1286                                 rs->sr_err = LDAP_SUCCESS;
1287                                 binddn = slap_empty_bv;
1288                                 bindcred = slap_empty_bv;
1289                                 break;
1290                         }
1291
1292                         goto done;
1293
1294                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1295                         struct berval authcDN;
1296
1297                         if ( BER_BVISNULL( &ndn ) ) {
1298                                 authcDN = slap_empty_bv;
1299
1300                         } else {
1301                                 authcDN = ndn;
1302                         }
1303                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1304                                         &authcDN, &authcDN );
1305                         if ( rs->sr_err != LDAP_SUCCESS ) {
1306                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1307                                         if ( sendok & LDAP_BACK_SENDERR ) {
1308                                                 send_ldap_result( op, rs );
1309                                         }
1310                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1311
1312                                 } else {
1313                                         rs->sr_err = LDAP_SUCCESS;
1314                                         binddn = slap_empty_bv;
1315                                         bindcred = slap_empty_bv;
1316                                         break;
1317                                 }
1318
1319                                 goto done;
1320                         }
1321                 }
1322
1323                 binddn = li->li_idassert_authcDN;
1324                 bindcred = li->li_idassert_passwd;
1325                 dobind = 1;
1326                 break;
1327         }
1328
1329         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1330 #ifdef HAVE_CYRUS_SASL
1331                 void            *defaults = NULL;
1332                 struct berval   authzID = BER_BVNULL;
1333                 int             freeauthz = 0;
1334
1335                 /* if SASL supports native authz, prepare for it */
1336                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1337                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1338                 {
1339                         switch ( li->li_idassert_mode ) {
1340                         case LDAP_BACK_IDASSERT_OTHERID:
1341                         case LDAP_BACK_IDASSERT_OTHERDN:
1342                                 authzID = li->li_idassert_authzID;
1343                                 break;
1344
1345                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1346                                 BER_BVSTR( &authzID, "dn:" );
1347                                 break;
1348
1349                         case LDAP_BACK_IDASSERT_SELF:
1350                                 if ( BER_BVISNULL( &ndn ) ) {
1351                                         /* connection is not authc'd, so don't idassert */
1352                                         BER_BVSTR( &authzID, "dn:" );
1353                                         break;
1354                                 }
1355                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1356                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1357                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1358                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1359                                                 ndn.bv_val, ndn.bv_len + 1 );
1360                                 freeauthz = 1;
1361                                 break;
1362
1363                         default:
1364                                 break;
1365                         }
1366                 }
1367
1368                 if ( li->li_idassert_secprops != NULL ) {
1369                         rs->sr_err = ldap_set_option( lc->lc_ld,
1370                                 LDAP_OPT_X_SASL_SECPROPS,
1371                                 (void *)li->li_idassert_secprops );
1372
1373                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1374                                 rs->sr_err = LDAP_OTHER;
1375                                 if ( sendok & LDAP_BACK_SENDERR ) {
1376                                         send_ldap_result( op, rs );
1377                                 }
1378                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1379                                 goto done;
1380                         }
1381                 }
1382
1383                 defaults = lutil_sasl_defaults( lc->lc_ld,
1384                                 li->li_idassert_sasl_mech.bv_val,
1385                                 li->li_idassert_sasl_realm.bv_val,
1386                                 li->li_idassert_authcID.bv_val,
1387                                 li->li_idassert_passwd.bv_val,
1388                                 authzID.bv_val );
1389
1390                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1391                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1392                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1393                                 defaults );
1394
1395                 rs->sr_err = slap_map_api2result( rs );
1396                 if ( rs->sr_err != LDAP_SUCCESS ) {
1397                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1398                         if ( sendok & LDAP_BACK_SENDERR ) {
1399                                 send_ldap_result( op, rs );
1400                         }
1401
1402                 } else {
1403                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1404                 }
1405
1406                 lutil_sasl_freedefs( defaults );
1407                 if ( freeauthz ) {
1408                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1409                 }
1410
1411                 goto done;
1412 #endif /* HAVE_CYRUS_SASL */
1413         }
1414
1415         switch ( li->li_idassert_authmethod ) {
1416         case LDAP_AUTH_NONE:
1417                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1418                 goto done;
1419
1420         case LDAP_AUTH_SIMPLE:
1421                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1422                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1423                                 &bindcred, NULL, NULL, &msgid );
1424                 break;
1425
1426         default:
1427                 /* unsupported! */
1428                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1429                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1430                 if ( sendok & LDAP_BACK_SENDERR ) {
1431                         send_ldap_result( op, rs );
1432                 }
1433                 goto done;
1434         }
1435
1436         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1437         if ( rc == LDAP_SUCCESS ) {
1438                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1439         }
1440 done:;
1441         return LDAP_BACK_CONN_ISBOUND( lc );
1442 }
1443
1444 /*
1445  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1446  * to existing server-side controls if required; if not,
1447  * the existing server-side controls are placed in *pctrls.
1448  * The caller, after using the controls in client API
1449  * operations, if ( *pctrls != op->o_ctrls ), should
1450  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1451  * The function returns success if the control could
1452  * be added if required, or if it did nothing; in the future,
1453  * it might return some error if it failed.
1454  *
1455  * if no bind took place yet, but the connection is bound
1456  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1457  * and explicitly add proxyAuthz the control to every operation
1458  * with the dn bound to the connection as control value.
1459  *
1460  * If no server-side controls are defined for the operation,
1461  * simply add the proxyAuthz control; otherwise, if the
1462  * proxyAuthz control is not already set, add it as
1463  * the first one
1464  *
1465  * FIXME: is controls order significant for security?
1466  * ANSWER: controls ordering and interoperability
1467  * must be indicated by the specs of each control; if none
1468  * is specified, the order is irrelevant.
1469  */
1470 int
1471 ldap_back_proxy_authz_ctrl(
1472                 ldapconn_t      *lc,
1473                 Operation       *op,
1474                 SlapReply       *rs,
1475                 LDAPControl     ***pctrls )
1476 {
1477         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1478         LDAPControl     **ctrls = NULL;
1479         int             i = 0,
1480                         mode;
1481         struct berval   assertedID,
1482                         ndn;
1483
1484         *pctrls = NULL;
1485
1486         rs->sr_err = LDAP_SUCCESS;
1487
1488         /* don't proxyAuthz if protocol is not LDAPv3 */
1489         switch ( li->li_version ) {
1490         case LDAP_VERSION3:
1491                 break;
1492
1493         case 0:
1494                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1495                         break;
1496                 }
1497                 /* fall thru */
1498
1499         default:
1500                 goto done;
1501         }
1502
1503         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1504          * but if it is not set this test fails.  We need a different
1505          * means to detect if idassert is enabled */
1506         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1507                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1508         {
1509                 goto done;
1510         }
1511
1512         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1513                 goto done;
1514         }
1515
1516         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1517                 ndn = op->o_conn->c_ndn;
1518
1519         } else {
1520                 ndn = op->o_ndn;
1521         }
1522
1523         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1524                 if ( op->o_proxy_authz ) {
1525                         /*
1526                          * FIXME: we do not want to perform proxyAuthz
1527                          * on behalf of the client, because this would
1528                          * be performed with "proxyauthzdn" privileges.
1529                          *
1530                          * This might actually be too strict, since
1531                          * the "proxyauthzdn" authzTo, and each entry's
1532                          * authzFrom attributes may be crafted
1533                          * to avoid unwanted proxyAuthz to take place.
1534                          */
1535 #if 0
1536                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1537                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1538 #endif
1539                         goto done;
1540                 }
1541
1542                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1543                         goto done;
1544                 }
1545
1546                 if ( BER_BVISNULL( &ndn ) ) {
1547                         goto done;
1548                 }
1549
1550                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1551                         goto done;
1552                 }
1553
1554         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1555                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1556                                 /* && ( !BER_BVISNULL( &ndn )
1557                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1558                 {
1559                         /* already asserted in SASL via native authz */
1560                         /* NOTE: the test on lc->lc_bound is used to trap
1561                          * native authorization of anonymous users,
1562                          * since in that case ndn is NULL */
1563                         goto done;
1564                 }
1565
1566         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1567                 int             rc;
1568                 struct berval authcDN;
1569
1570                 if ( BER_BVISNULL( &ndn ) ) {
1571                         authcDN = slap_empty_bv;
1572                 } else {
1573                         authcDN = ndn;
1574                 }
1575                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1576                                 &authcDN, & authcDN );
1577                 if ( rc != LDAP_SUCCESS ) {
1578                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1579                         {
1580                                 /* ndn is not authorized
1581                                  * to use idassert */
1582                                 rs->sr_err = rc;
1583                         }
1584                         goto done;
1585                 }
1586         }
1587
1588         if ( op->o_proxy_authz ) {
1589                 /*
1590                  * FIXME: we can:
1591                  * 1) ignore the already set proxyAuthz control
1592                  * 2) leave it in place, and don't set ours
1593                  * 3) add both
1594                  * 4) reject the operation
1595                  *
1596                  * option (4) is very drastic
1597                  * option (3) will make the remote server reject
1598                  * the operation, thus being equivalent to (4)
1599                  * option (2) will likely break the idassert
1600                  * assumptions, so we cannot accept it;
1601                  * option (1) means that we are contradicting
1602                  * the client's reques.
1603                  *
1604                  * I think (4) is the only correct choice.
1605                  */
1606                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1607                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1608         }
1609
1610         if ( op->o_is_auth_check ) {
1611                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1612
1613         } else {
1614                 mode = li->li_idassert_mode;
1615         }
1616
1617         switch ( mode ) {
1618         case LDAP_BACK_IDASSERT_SELF:
1619                 if ( BER_BVISNULL( &ndn ) ) {
1620                         goto done;
1621                 }
1622                 assertedID = ndn;
1623                 break;
1624
1625         case LDAP_BACK_IDASSERT_LEGACY:
1626                 /* original behavior:
1627                  * assert the client's identity */
1628                 if ( BER_BVISNULL( &ndn ) ) {
1629                         assertedID = slap_empty_bv;
1630                 } else {
1631                         assertedID = ndn;
1632                 }
1633                 break;
1634
1635         case LDAP_BACK_IDASSERT_ANONYMOUS:
1636                 /* assert "anonymous" */
1637                 assertedID = slap_empty_bv;
1638                 break;
1639
1640         case LDAP_BACK_IDASSERT_NOASSERT:
1641                 /* don't assert; bind as proxyauthzdn */
1642                 goto done;
1643
1644         case LDAP_BACK_IDASSERT_OTHERID:
1645         case LDAP_BACK_IDASSERT_OTHERDN:
1646                 /* assert idassert DN */
1647                 assertedID = li->li_idassert_authzID;
1648                 break;
1649
1650         default:
1651                 assert( 0 );
1652         }
1653
1654         if ( BER_BVISNULL( &assertedID ) ) {
1655                 assertedID = slap_empty_bv;
1656         }
1657
1658         /* don't idassert the bound DN (ITS#4497) */
1659         if ( dn_match( &assertedID, &lc->lc_bound_ndn ) ) {
1660                 goto done;
1661         }
1662
1663         if ( op->o_ctrls ) {
1664                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1665                         /* just count ctrls */ ;
1666         }
1667
1668         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1669                         op->o_tmpmemctx );
1670         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1671
1672         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1673         ctrls[ 0 ]->ldctl_iscritical = 1;
1674
1675         switch ( li->li_idassert_mode ) {
1676         /* already in u:ID or dn:DN form */
1677         case LDAP_BACK_IDASSERT_OTHERID:
1678         case LDAP_BACK_IDASSERT_OTHERDN:
1679                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1680                 break;
1681
1682         /* needs the dn: prefix */
1683         default:
1684                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1685                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1686                                 op->o_tmpmemctx );
1687                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1688                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1689                                 assertedID.bv_val, assertedID.bv_len + 1 );
1690                 break;
1691         }
1692
1693         /* Older versions of <draft-weltman-ldapv3-proxy> required
1694          * to encode the value of the authzID (and called it proxyDN);
1695          * this hack provides compatibility with those DSAs that
1696          * implement it this way */
1697         if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
1698                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
1699                 BerElementBuffer        berbuf;
1700                 BerElement              *ber = (BerElement *)&berbuf;
1701                 ber_tag_t               tag;
1702
1703                 ber_init2( ber, 0, LBER_USE_DER );
1704                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1705
1706                 tag = ber_printf( ber, "O", &authzID );
1707                 if ( tag == LBER_ERROR ) {
1708                         rs->sr_err = LDAP_OTHER;
1709                         goto free_ber;
1710                 }
1711
1712                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1713                         rs->sr_err = LDAP_OTHER;
1714                         goto free_ber;
1715                 }
1716
1717 free_ber:;
1718                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1719                 ber_free_buf( ber );
1720
1721                 if ( rs->sr_err != LDAP_SUCCESS ) {
1722                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1723                         ctrls = NULL;
1724                         goto done;
1725                 }
1726
1727         } else if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
1728                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
1729                                         tmp;
1730                 BerElementBuffer        berbuf;
1731                 BerElement              *ber = (BerElement *)&berbuf;
1732                 ber_tag_t               tag;
1733
1734                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
1735                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1736                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1737                         ctrls = NULL;
1738                         rs->sr_err = LDAP_PROTOCOL_ERROR;
1739                         goto done;
1740                 }
1741
1742                 tmp = authzID;
1743                 tmp.bv_val += STRLENOF( "dn:" );
1744                 tmp.bv_len -= STRLENOF( "dn:" );
1745
1746                 ber_init2( ber, 0, LBER_USE_DER );
1747                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1748
1749                 /* apparently, Mozilla API encodes this
1750                  * as "SEQUENCE { LDAPDN }" */
1751                 tag = ber_printf( ber, "{O}", &tmp );
1752                 if ( tag == LBER_ERROR ) {
1753                         rs->sr_err = LDAP_OTHER;
1754                         goto free_ber2;
1755                 }
1756
1757                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1758                         rs->sr_err = LDAP_OTHER;
1759                         goto free_ber2;
1760                 }
1761
1762 free_ber2:;
1763                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1764                 ber_free_buf( ber );
1765
1766                 if ( rs->sr_err != LDAP_SUCCESS ) {
1767                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1768                         ctrls = NULL;
1769                         goto done;
1770                 }
1771
1772                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
1773         }
1774
1775         if ( op->o_ctrls ) {
1776                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1777                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1778                 }
1779         }
1780         ctrls[ i + 1 ] = NULL;
1781
1782 done:;
1783         if ( ctrls == NULL ) {
1784                 ctrls = op->o_ctrls;
1785         }
1786
1787         *pctrls = ctrls;
1788
1789         return rs->sr_err;
1790 }
1791
1792 int
1793 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1794 {
1795         LDAPControl     **ctrls = *pctrls;
1796
1797         /* we assume that the first control is the proxyAuthz
1798          * added by back-ldap, so it's the only one we explicitly
1799          * free */
1800         if ( ctrls && ctrls != op->o_ctrls ) {
1801                 assert( ctrls[ 0 ] != NULL );
1802
1803                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1804                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1805                 }
1806
1807                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
1808         }
1809
1810         *pctrls = NULL;
1811
1812         return 0;
1813 }