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 int
  45 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  46
  47 static int
  48 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  49
  50 static int
  51 ldap_back_conndnlc_cmp( const void *c1, const void *c2 );
  52
  53 int
  54 ldap_back_bind( Operation *op, SlapReply *rs )
  55 {
  56         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
  57         ldapconn_t      *lc;
  58
  59         int rc = 0;
  60         ber_int_t msgid;
  61
  62         lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR );
  63         if ( !lc ) {
  64                 return rs->sr_err;
  65         }
  66
  67         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
  68                 ch_free( lc->lc_bound_ndn.bv_val );
  69                 BER_BVZERO( &lc->lc_bound_ndn );
  70         }
  71         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
  72
  73         /* method is always LDAP_AUTH_SIMPLE if we got here */
  74         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
  75                         LDAP_SASL_SIMPLE,
  76                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
  77         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
  78
  79         if ( rc == LDAP_SUCCESS ) {
  80                 /* If defined, proxyAuthz will be used also when
  81                  * back-ldap is the authorizing backend; for this
  82                  * purpose, a successful bind is followed by a
  83                  * bind with the configured identity assertion */
  84                 /* NOTE: use with care */
  85                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
  86                         ldap_back_proxy_authz_bind( lc, op, rs, LDAP_BACK_SENDERR );
  87                         if ( !LDAP_BACK_CONN_ISBOUND( lc ) ) {
  88                                 rc = 1;
  89                                 goto done;
  90                         }
  91                 }
  92
  93                 LDAP_BACK_CONN_ISBOUND_SET( lc );
  94                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
  95
  96                 if ( LDAP_BACK_SAVECRED( li ) ) {
  97                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
  98                                 memset( lc->lc_cred.bv_val, 0,
  99                                                 lc->lc_cred.bv_len );
 100                         }
 101                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
 102                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
 103                 }
 104         }
 105 done:;
 106
 107         assert( lc->lc_binding == 1 );
 108         lc->lc_binding = 0;
 109
 110         /* must re-insert if local DN changed as result of bind */
 111         if ( !LDAP_BACK_CONN_ISBOUND( lc )
 112                 || ( LDAP_BACK_CONN_ISBOUND( lc )
 113                         && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) )
 114         {
 115                 int             lerr = -1;
 116                 ldapconn_t      *tmplc;
 117
 118                 /* wait for all other ops to release the connection */
 119 retry_lock:;
 120                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 121                 if ( lc->lc_refcnt > 1 ) {
 122                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 123                         ldap_pvt_thread_yield();
 124                         goto retry_lock;
 125                 }
 126
 127                 assert( lc->lc_refcnt == 1 );
 128                 tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 129                                 ldap_back_conndnlc_cmp );
 130                 assert( tmplc == NULL || lc == tmplc );
 131
 132                 if ( LDAP_BACK_CONN_ISBOUND( lc ) ) {
 133                         ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 134                         lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 135                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
 136                 }
 137
 138                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 139                 switch ( lerr ) {
 140                 case 0:
 141                         break;
 142
 143                 case -1:
 144                         /* duplicate; someone else successfully bound
 145                          * on the same connection with the same identity;
 146                          * we can do this because lc_refcnt == 1 */
 147                         ldap_back_conn_free( lc );
 148                         lc = NULL;
 149                 }
 150         }
 151
 152         if ( lc != NULL ) {
 153                 ldap_back_release_conn( op, rs, lc );
 154         }
 155
 156         return( rc );
 157 }
 158
 159 /*
 160  * ldap_back_conndn_cmp
 161  *
 162  * compares two ldapconn_t based on the value of the conn pointer
 163  * and of the local DN; used by avl stuff for insert, lookup
 164  * and direct delete
 165  */
 166 int
 167 ldap_back_conndn_cmp( const void *c1, const void *c2 )
 168 {
 169         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 170         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 171         int rc;
 172
 173         /* If local DNs don't match, it is definitely not a match */
 174         /* For shared sessions, conn is NULL. Only explicitly
 175          * bound sessions will have non-NULL conn.
 176          */
 177         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 178         if ( rc == 0 ) {
 179                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 180         }
 181
 182         return rc;
 183 }
 184
 185 /*
 186  * ldap_back_conndnlc_cmp
 187  *
 188  * compares two ldapconn_t based on the value of the conn pointer,
 189  * the local DN and the lc pointer; used by avl stuff for insert, lookup
 190  * and direct delete
 191  */
 192 static int
 193 ldap_back_conndnlc_cmp( const void *c1, const void *c2 )
 194 {
 195         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 196         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 197         int rc;
 198
 199         /* If local DNs don't match, it is definitely not a match */
 200         /* For shared sessions, conn is NULL. Only explicitly
 201          * bound sessions will have non-NULL conn.
 202          */
 203         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 204         if ( rc == 0 ) {
 205                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 206                 if ( rc == 0 ) {
 207                         rc = SLAP_PTRCMP( lc1, lc2 );
 208                 }
 209         }
 210
 211         return rc;
 212 }
 213
 214 /*
 215  * ldap_back_conn_cmp
 216  *
 217  * compares two ldapconn_t based on the value of the conn pointer;
 218  * used by avl stuff for delete of all conns with the same connid
 219  */
 220 int
 221 ldap_back_conn_cmp( const void *c1, const void *c2 )
 222 {
 223         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 224         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 225
 226         /* For shared sessions, conn is NULL. Only explicitly
 227          * bound sessions will have non-NULL conn.
 228          */
 229         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 230 }
 231
 232 /*
 233  * ldap_back_conndn_dup
 234  *
 235  * returns -1 in case a duplicate ldapconn_t has been inserted;
 236  * used by avl stuff
 237  */
 238 int
 239 ldap_back_conndn_dup( void *c1, void *c2 )
 240 {
 241         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 242         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 243
 244         /* Cannot have more than one shared session with same DN */
 245         if ( lc1->lc_conn == lc2->lc_conn &&
 246                 dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) )
 247         {
 248                 return -1;
 249         }
 250
 251         return 0;
 252 }
 253
 254 #if PRINT_CONNTREE > 0
 255 static void
 256 ravl_print( Avlnode *root, int depth )
 257 {
 258         int             i;
 259         ldapconn_t      *lc;
 260
 261         if ( root == 0 ) {
 262                 return;
 263         }
 264
 265         ravl_print( root->avl_right, depth+1 );
 266
 267         for ( i = 0; i < depth; i++ ) {
 268                 fprintf( stderr, "-" );
 269         }
 270
 271         lc = root->avl_data;
 272         fprintf( stderr, "lc=%p local=\"%s\" conn=%p %s refcnt=%d\n",
 273                 (void *)lc, lc->lc_local_ndn.bv_val, (void *)lc->lc_conn,
 274                 avl_bf2str( root->avl_bf ), lc->lc_refcnt );
 275
 276         ravl_print( root->avl_left, depth+1 );
 277 }
 278
 279 static void
 280 myprint( Avlnode *root )
 281 {
 282         fprintf( stderr, "========>\n" );
 283
 284         if ( root == 0 ) {
 285                 fprintf( stderr, "\tNULL\n" );
 286
 287         } else {
 288                 ravl_print( root, 0 );
 289         }
 290
 291         fprintf( stderr, "<========\n" );
 292 }
 293 #endif /* PRINT_CONNTREE */
 294
 295 int
 296 ldap_back_freeconn( Operation *op, ldapconn_t *lc, int dolock )
 297 {
 298         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 299         ldapconn_t      *tmplc;
 300
 301         if ( dolock ) {
 302                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 303         }
 304
 305         tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 306                         ldap_back_conndnlc_cmp );
 307         assert( LDAP_BACK_CONN_TAINTED( lc ) || tmplc == lc );
 308         if ( lc->lc_refcnt == 0 ) {
 309                 ldap_back_conn_free( (void *)lc );
 310         }
 311
 312         if ( dolock ) {
 313                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 314         }
 315
 316         return 0;
 317 }
 318
 319 #ifdef HAVE_TLS
 320 static int
 321 ldap_back_start_tls(
 322         LDAP            *ld,
 323         int             protocol,
 324         int             *is_tls,
 325         const char      *url,
 326         unsigned        flags,
 327         int             retries,
 328         const char      **text )
 329 {
 330         int             rc = LDAP_SUCCESS;
 331         ldapinfo_t      dummy;
 332
 333         /* this is ridiculous... */
 334         dummy.li_flags = flags;
 335
 336         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 337         if ( ( LDAP_BACK_USE_TLS( &dummy ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &dummy ) ) )
 338                                 && !ldap_is_ldaps_url( url ) )
 339         {
 340 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 341                 /*
 342                  * use asynchronous StartTLS
 343                  * in case, chase referral (not implemented yet)
 344                  */
 345                 int             msgid;
 346
 347                 if ( protocol == 0 ) {
 348                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 349                                         (void *)&protocol );
 350                 }
 351
 352                 if ( protocol < LDAP_VERSION3 ) {
 353                         /* we should rather bail out... */
 354                         rc = LDAP_UNWILLING_TO_PERFORM;
 355                         *text = "invalid protocol version";
 356                 }
 357
 358                 if ( rc == LDAP_SUCCESS ) {
 359                         rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 360                 }
 361
 362                 if ( rc == LDAP_SUCCESS ) {
 363                         LDAPMessage     *res = NULL;
 364                         struct timeval  tv;
 365
 366                         LDAP_BACK_TV_SET( &tv );
 367
 368 retry:;
 369                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 370                         if ( rc < 0 ) {
 371                                 rc = LDAP_UNAVAILABLE;
 372
 373                         } else if ( rc == 0 ) {
 374                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 375                                         ldap_pvt_thread_yield();
 376                                         if ( retries > 0 ) {
 377                                                 retries--;
 378                                         }
 379                                         LDAP_BACK_TV_SET( &tv );
 380                                         goto retry;
 381                                 }
 382                                 rc = LDAP_UNAVAILABLE;
 383
 384                         } else if ( rc == LDAP_RES_EXTENDED ) {
 385                                 struct berval   *data = NULL;
 386
 387                                 rc = ldap_parse_extended_result( ld, res,
 388                                                 NULL, &data, 0 );
 389                                 if ( rc == LDAP_SUCCESS ) {
 390                                         int err;
 391                                         rc = ldap_parse_result( ld, res, &err,
 392                                                 NULL, NULL, NULL, NULL, 1 );
 393                                         if ( rc == LDAP_SUCCESS ) {
 394                                                 rc = err;
 395                                         }
 396                                         res = NULL;
 397
 398                                         /* FIXME: in case a referral
 399                                          * is returned, should we try
 400                                          * using it instead of the
 401                                          * configured URI? */
 402                                         if ( rc == LDAP_SUCCESS ) {
 403                                                 rc = ldap_install_tls( ld );
 404
 405                                         } else if ( rc == LDAP_REFERRAL ) {
 406                                                 rc = LDAP_UNWILLING_TO_PERFORM;
 407                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 408                                         }
 409
 410                                         if ( data ) {
 411                                                 if ( data->bv_val ) {
 412                                                         ber_memfree( data->bv_val );
 413                                                 }
 414                                                 ber_memfree( data );
 415                                         }
 416                                 }
 417
 418                         } else {
 419                                 rc = LDAP_OTHER;
 420                         }
 421
 422                         if ( res != NULL ) {
 423                                 ldap_msgfree( res );
 424                         }
 425                 }
 426 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 427                 /*
 428                  * use synchronous StartTLS
 429                  */
 430                 rc = ldap_start_tls_s( ld, NULL, NULL );
 431 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 432
 433                 /* if StartTLS is requested, only attempt it if the URL
 434                  * is not "ldaps://"; this may occur not only in case
 435                  * of misconfiguration, but also when used in the chain
 436                  * overlay, where the "uri" can be parsed out of a referral */
 437                 switch ( rc ) {
 438                 case LDAP_SUCCESS:
 439                         *is_tls = 1;
 440                         break;
 441
 442                 case LDAP_SERVER_DOWN:
 443                         break;
 444
 445                 default:
 446                         if ( LDAP_BACK_TLS_CRITICAL( &dummy ) ) {
 447                                 *text = "could not start TLS";
 448                                 break;
 449                         }
 450
 451                         /* in case Start TLS is not critical */
 452                         *is_tls = 0;
 453                         rc = LDAP_SUCCESS;
 454                         break;
 455                 }
 456
 457         } else {
 458                 *is_tls = 0;
 459         }
 460
 461         return rc;
 462 }
 463 #endif /* HAVE_TLS */
 464
 465 static int
 466 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 467 {
 468         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 469         int             version;
 470         LDAP            *ld = NULL;
 471 #ifdef HAVE_TLS
 472         int             is_tls = op->o_conn->c_is_tls;
 473 #endif /* HAVE_TLS */
 474
 475         assert( lcp != NULL );
 476
 477         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 478         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 479         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 480         if ( rs->sr_err != LDAP_SUCCESS ) {
 481                 goto error_return;
 482         }
 483
 484         if ( li->li_urllist_f ) {
 485                 ldap_set_urllist_proc( ld, li->li_urllist_f, li->li_urllist_p );
 486         }
 487
 488         /* Set LDAP version. This will always succeed: If the client
 489          * bound with a particular version, then so can we.
 490          */
 491         if ( li->li_version != 0 ) {
 492                 version = li->li_version;
 493
 494         } else if ( op->o_protocol != 0 ) {
 495                 version = op->o_protocol;
 496
 497         } else {
 498                 /* assume it's an internal op; set to LDAPv3 */
 499                 version = LDAP_VERSION3;
 500         }
 501         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&version );
 502
 503         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 504         ldap_set_option( ld, LDAP_OPT_REFERRALS,
 505                 LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 506
 507         if ( li->li_network_timeout > 0 ) {
 508                 struct timeval          tv;
 509
 510                 tv.tv_sec = li->li_network_timeout;
 511                 tv.tv_usec = 0;
 512                 ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
 513         }
 514
 515 #ifdef HAVE_TLS
 516         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 517         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 518                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 519         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 520         if ( rs->sr_err != LDAP_SUCCESS ) {
 521                 ldap_unbind_ext( ld, NULL, NULL );
 522                 goto error_return;
 523         }
 524 #endif /* HAVE_TLS */
 525
 526         if ( *lcp == NULL ) {
 527                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 528                 (*lcp)->lc_flags = li->li_flags;
 529         }
 530         (*lcp)->lc_ld = ld;
 531         (*lcp)->lc_refcnt = 1;
 532         (*lcp)->lc_binding = 1;
 533 #ifdef HAVE_TLS
 534         if ( is_tls ) {
 535                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 536         } else {
 537                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 538         }
 539 #endif /* HAVE_TLS */
 540
 541 error_return:;
 542         if ( rs->sr_err != LDAP_SUCCESS ) {
 543                 rs->sr_err = slap_map_api2result( rs );
 544                 if ( sendok & LDAP_BACK_SENDERR ) {
 545                         if ( rs->sr_text == NULL ) {
 546                                 rs->sr_text = "ldap_initialize() failed";
 547                         }
 548                         send_ldap_result( op, rs );
 549                         rs->sr_text = NULL;
 550                 }
 551
 552         } else {
 553                 if ( li->li_conn_ttl > 0 ) {
 554                         (*lcp)->lc_create_time = op->o_time;
 555                 }
 556         }
 557
 558         return rs->sr_err;
 559 }
 560
 561 ldapconn_t *
 562 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 563 {
 564         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 565         ldapconn_t      *lc = NULL,
 566                         lc_curr = { 0 };
 567         int             refcnt = 1, binding = 1;
 568
 569         /* Internal searches are privileged and shared. So is root. */
 570         if ( op->o_do_not_cache || be_isroot( op ) ) {
 571                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 572                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 573                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 574
 575         } else {
 576                 lc_curr.lc_local_ndn = op->o_ndn;
 577                 /* Explicit binds must not be shared */
 578                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 579                         lc_curr.lc_conn = op->o_conn;
 580
 581                 } else {
 582                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 583                 }
 584         }
 585
 586         /* Explicit Bind requests always get their own conn */
 587         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 588                 /* Searches for a ldapconn in the avl tree */
 589 retry_lock:
 590                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 591
 592                 lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 593                                 (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 594                 if ( lc != NULL ) {
 595                         /* Don't reuse connections while they're still binding */
 596                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 597                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 598                                 ldap_pvt_thread_yield();
 599                                 goto retry_lock;
 600                         }
 601                         refcnt = ++lc->lc_refcnt;
 602                         binding = ++lc->lc_binding;
 603                 }
 604                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 605         }
 606
 607         /* Looks like we didn't get a bind. Open a new session... */
 608         if ( lc == NULL ) {
 609                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 610                         return NULL;
 611                 }
 612                 if ( sendok & LDAP_BACK_BINDING ) {
 613                         LDAP_BACK_CONN_BINDING_SET( lc );
 614                 }
 615                 lc->lc_conn = lc_curr.lc_conn;
 616                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 617
 618                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 619                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 620                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 621                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 622
 623                 } else {
 624                         BER_BVZERO( &lc->lc_cred );
 625                         BER_BVZERO( &lc->lc_bound_ndn );
 626 #if 0
 627                         /* FIXME: if we set lc_bound_ndn = o_ndn
 628                          * we end up with a bind with DN but no password! */
 629                         if ( !BER_BVISEMPTY( &op->o_ndn )
 630                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 631                         {
 632                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 633                         }
 634 #endif
 635                 }
 636
 637 #ifdef HAVE_TLS
 638                 /* if start TLS failed but it was not mandatory,
 639                  * check if the non-TLS connection was already
 640                  * in cache; in case, destroy the newly created
 641                  * connection and use the existing one */
 642                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 643                                 && !ldap_tls_inplace( lc->lc_ld ) )
 644                 {
 645                         ldapconn_t *tmplc;
 646
 647                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 648                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 649                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 650                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 651                         if ( tmplc != NULL ) {
 652                                 refcnt = ++tmplc->lc_refcnt;
 653                                 binding = ++tmplc->lc_binding;
 654                                 ldap_back_conn_free( lc );
 655                                 lc = tmplc;
 656                         }
 657                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 658
 659                         if ( tmplc != NULL ) {
 660                                 goto done;
 661                         }
 662                 }
 663 #endif /* HAVE_TLS */
 664
 665                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 666
 667                 /* Inserts the newly created ldapconn in the avl tree */
 668                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 669
 670                 assert( lc->lc_refcnt == 1 );
 671                 assert( lc->lc_binding == 1 );
 672                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 673                         ldap_back_conndn_cmp, ldap_back_conndn_dup );
 674
 675 #if PRINT_CONNTREE > 0
 676                 myprint( li->li_conninfo.lai_tree );
 677 #endif /* PRINT_CONNTREE */
 678
 679                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 680
 681                 Debug( LDAP_DEBUG_TRACE,
 682                         "=>ldap_back_getconn: conn %p inserted refcnt=%u binding=%u\n",
 683                         (void *)lc, refcnt, binding );
 684
 685                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 686                 switch ( rs->sr_err ) {
 687                 case 0:
 688                         break;
 689
 690                 case -1:
 691                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 692                                 /* duplicate: free and try to get the newly created one */
 693                                 goto retry_lock;
 694                         }
 695                         /* taint connection, so that it'll be freed when released */
 696                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 697                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 698                                         ldap_back_conndnlc_cmp );
 699                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 700                         LDAP_BACK_CONN_TAINTED_SET( lc );
 701                         break;
 702
 703                 default:
 704                         ldap_back_conn_free( lc );
 705                         rs->sr_err = LDAP_OTHER;
 706                         rs->sr_text = "proxy bind collision";
 707                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 708                                 send_ldap_result( op, rs );
 709                                 rs->sr_text = NULL;
 710                         }
 711                         return NULL;
 712                 }
 713
 714         } else {
 715                 char    buf[ SLAP_TEXT_BUFLEN ];
 716                 int     expiring = 0;
 717
 718                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
 719                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
 720                 {
 721                         expiring = 1;
 722
 723                         /* let it be used, but taint/delete it so that
 724                          * no-one else can look it up any further */
 725                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 726                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 727                                         ldap_back_conndnlc_cmp );
 728                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 729                         LDAP_BACK_CONN_TAINTED_SET( lc );
 730                 }
 731
 732                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 733                         snprintf( buf, sizeof( buf ),
 734                                 "conn %p fetched refcnt=%u binding=%u%s",
 735                                 (void *)lc, refcnt, binding, expiring ? " expiring" : "" );
 736                         Debug( LDAP_DEBUG_TRACE,
 737                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
 738                 }
 739
 740         }
 741
 742 #ifdef HAVE_TLS
 743 done:;
 744 #endif /* HAVE_TLS */
 745         if ( li->li_idle_timeout && lc ) {
 746                 lc->lc_time = op->o_time;
 747         }
 748
 749         return lc;
 750 }
 751
 752 void
 753 ldap_back_release_conn_lock(
 754         Operation               *op,
 755         SlapReply               *rs,
 756         ldapconn_t              *lc,
 757         int                     dolock )
 758 {
 759         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 760
 761         if ( dolock ) {
 762                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 763         }
 764         assert( lc->lc_refcnt > 0 );
 765         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 766         lc->lc_refcnt--;
 767         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
 768                 ldap_back_freeconn( op, lc, 0 );
 769         }
 770         if ( dolock ) {
 771                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 772         }
 773 }
 774
 775 /*
 776  * ldap_back_dobind
 777  *
 778  * Note: as the check for the value of lc->lc_bound was already here, I removed
 779  * it from all the callers, and I made the function return the flag, so
 780  * it can be used to simplify the check.
 781  *
 782  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 783  */
 784 static int
 785 ldap_back_dobind_int(
 786         ldapconn_t              *lc,
 787         Operation               *op,
 788         SlapReply               *rs,
 789         ldap_back_send_t        sendok,
 790         int                     retries,
 791         int                     dolock )
 792 {
 793         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 794
 795         int             rc, binding = 0;
 796         ber_int_t       msgid;
 797
 798         assert( retries >= 0 );
 799
 800 retry_lock:;
 801         if ( dolock ) {
 802                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 803         }
 804
 805         if ( binding == 0 ) {
 806                 /* check if already bound */
 807                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 808                 if ( rc ) {
 809                         lc->lc_binding--;
 810                         if ( dolock ) {
 811                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 812                         }
 813                         return rc;
 814                 }
 815
 816                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 817                         /* if someone else is about to bind it, give up and retry */
 818                         if ( dolock ) {
 819                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 820                         }
 821                         ldap_pvt_thread_yield();
 822                         goto retry_lock;
 823
 824                 } else {
 825                         /* otherwise this thread will bind it */
 826                         LDAP_BACK_CONN_BINDING_SET( lc );
 827                         binding = 1;
 828                 }
 829         }
 830
 831         /* wait for pending operations to finish */
 832         /* FIXME: may become a bottleneck! */
 833         if ( lc->lc_refcnt != lc->lc_binding ) {
 834                 if ( dolock ) {
 835                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 836                 }
 837                 ldap_pvt_thread_yield();
 838                 goto retry_lock;
 839         }
 840
 841         if ( dolock ) {
 842                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 843         }
 844
 845 #if 0
 846         while ( lc->lc_refcnt > 1 ) {
 847                 ldap_pvt_thread_yield();
 848                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 849                 if ( rc ) {
 850                         return rc;
 851                 }
 852         }
 853
 854         if ( dolock ) {
 855                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 856         }
 857         LDAP_BACK_CONN_BINDING_SET( lc );
 858         if ( dolock ) {
 859                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 860         }
 861 #endif
 862
 863         /*
 864          * FIXME: we need to let clients use proxyAuthz
 865          * otherwise we cannot do symmetric pools of servers;
 866          * we have to live with the fact that a user can
 867          * authorize itself as any ID that is allowed
 868          * by the authzTo directive of the "proxyauthzdn".
 869          */
 870         /*
 871          * NOTE: current Proxy Authorization specification
 872          * and implementation do not allow proxy authorization
 873          * control to be provided with Bind requests
 874          */
 875         /*
 876          * if no bind took place yet, but the connection is bound
 877          * and the "idassert-authcDN" (or other ID) is set,
 878          * then bind as the asserting identity and explicitly
 879          * add the proxyAuthz control to every operation with the
 880          * dn bound to the connection as control value.
 881          * This is done also if this is the authrizing backend,
 882          * but the "override" flag is given to idassert.
 883          * It allows to use SASL bind and yet proxyAuthz users
 884          */
 885         if ( op->o_conn != NULL &&
 886                         !op->o_do_not_cache &&
 887                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 888                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 889         {
 890                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok );
 891                 goto done;
 892         }
 893
 894 #ifdef HAVE_CYRUS_SASL
 895         if ( LDAP_BACK_CONN_ISPRIV( lc )
 896                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 897         {
 898                 void            *defaults = NULL;
 899
 900                 if ( li->li_acl_secprops != NULL ) {
 901                         rc = ldap_set_option( lc->lc_ld,
 902                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 903
 904                         if ( rc != LDAP_OPT_SUCCESS ) {
 905                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 906                                         "(SECPROPS,\"%s\") failed!\n",
 907                                         li->li_acl_secprops, 0, 0 );
 908                                 goto done;
 909                         }
 910                 }
 911
 912                 defaults = lutil_sasl_defaults( lc->lc_ld,
 913                                 li->li_acl_sasl_mech.bv_val,
 914                                 li->li_acl_sasl_realm.bv_val,
 915                                 li->li_acl_authcID.bv_val,
 916                                 li->li_acl_passwd.bv_val,
 917                                 NULL );
 918
 919                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 920                                 li->li_acl_authcDN.bv_val,
 921                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 922                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 923                                 defaults );
 924
 925                 lutil_sasl_freedefs( defaults );
 926
 927                 rs->sr_err = slap_map_api2result( rs );
 928                 if ( rs->sr_err != LDAP_SUCCESS ) {
 929                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 930                         send_ldap_result( op, rs );
 931
 932                 } else {
 933                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 934                 }
 935                 goto done;
 936         }
 937 #endif /* HAVE_CYRUS_SASL */
 938
 939 retry:;
 940         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 941                         lc->lc_bound_ndn.bv_val,
 942                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 943                         NULL, NULL, &msgid );
 944
 945         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 946                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 947                         if ( dolock ) {
 948                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 949                         }
 950
 951                         assert( lc->lc_refcnt > 0 );
 952                         if ( lc->lc_refcnt == 1 ) {
 953                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 954                                 lc->lc_ld = NULL;
 955
 956                                 /* lc here must be the regular lc, reset and ready for init */
 957                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 958                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 959                                         lc->lc_binding--;
 960                                         lc->lc_refcnt = 0;
 961                                 }
 962                         }
 963
 964                         if ( dolock ) {
 965                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 966                         }
 967
 968                         if ( rs->sr_err == LDAP_SUCCESS ) {
 969                                 if ( retries > 0 ) {
 970                                         retries--;
 971                                 }
 972                                 goto retry;
 973                         }
 974
 975                 } else {
 976                         if ( dolock ) {
 977                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 978                         }
 979                         lc->lc_binding--;
 980                         if ( dolock ) {
 981                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 982                         }
 983                 }
 984
 985                 lc->lc_binding--;
 986                 ldap_back_freeconn( op, lc, dolock );
 987                 rs->sr_err = slap_map_api2result( rs );
 988
 989                 return 0;
 990         }
 991
 992         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
 993         if ( rc == LDAP_SUCCESS ) {
 994                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 995         }
 996
 997 done:;
 998         lc->lc_binding--;
 999         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1000         rc = LDAP_BACK_CONN_ISBOUND( lc );
1001         if ( !rc ) {
1002                 ldap_back_release_conn_lock( op, rs, lc, dolock );
1003         }
1004
1005         return rc;
1006 }
1007
1008 int
1009 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1010 {
1011         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1012
1013         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
1014 }
1015
1016 /*
1017  * ldap_back_default_rebind
1018  *
1019  * This is a callback used for chasing referrals using the same
1020  * credentials as the original user on this session.
1021  */
1022 int
1023 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1024         ber_int_t msgid, void *params )
1025 {
1026         ldapconn_t      *lc = (ldapconn_t *)params;
1027
1028 #ifdef HAVE_TLS
1029         /* ... otherwise we couldn't get here */
1030         assert( lc != NULL );
1031
1032         if ( !ldap_tls_inplace( ld ) ) {
1033                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1034                                 rc;
1035                 const char      *text = NULL;
1036
1037                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1038                         LDAP_BACK_RETRY_DEFAULT, &text );
1039                 if ( rc != LDAP_SUCCESS ) {
1040                         return rc;
1041                 }
1042         }
1043 #endif /* HAVE_TLS */
1044
1045         /* FIXME: add checks on the URL/identity? */
1046
1047         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
1048                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1049 }
1050
1051 /*
1052  * ldap_back_default_urllist
1053  */
1054 int
1055 ldap_back_default_urllist(
1056         LDAP            *ld,
1057         LDAPURLDesc     **urllist,
1058         LDAPURLDesc     **url,
1059         void            *params )
1060 {
1061         ldapinfo_t      *li = (ldapinfo_t *)params;
1062         LDAPURLDesc     **urltail;
1063
1064         if ( urllist == url ) {
1065                 return LDAP_SUCCESS;
1066         }
1067
1068         for ( urltail = &(*url)->lud_next; *urltail; urltail = &(*urltail)->lud_next )
1069                 /* count */ ;
1070
1071         *urltail = *urllist;
1072         *urllist = *url;
1073         *url = NULL;
1074
1075         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1076         if ( li->li_uri ) {
1077                 ch_free( li->li_uri );
1078         }
1079
1080         ldap_get_option( ld, LDAP_OPT_URI, (void *)&li->li_uri );
1081         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1082
1083         return LDAP_SUCCESS;
1084 }
1085
1086 int
1087 ldap_back_op_result(
1088                 ldapconn_t              *lc,
1089                 Operation               *op,
1090                 SlapReply               *rs,
1091                 ber_int_t               msgid,
1092                 time_t                  timeout,
1093                 ldap_back_send_t        sendok )
1094 {
1095         char            *match = NULL;
1096         LDAPMessage     *res = NULL;
1097         char            *text = NULL;
1098
1099 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1100
1101         rs->sr_text = NULL;
1102         rs->sr_matched = NULL;
1103
1104         /* if the error recorded in the reply corresponds
1105          * to a successful state, get the error from the
1106          * remote server response */
1107         if ( ERR_OK( rs->sr_err ) ) {
1108                 int             rc;
1109                 struct timeval  tv;
1110
1111                 if ( timeout ) {
1112                         tv.tv_sec = timeout;
1113                         tv.tv_usec = 0;
1114
1115                 } else {
1116                         LDAP_BACK_TV_SET( &tv );
1117                 }
1118
1119 retry:;
1120                 /* if result parsing fails, note the failure reason */
1121                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1122                 switch ( rc ) {
1123                 case 0:
1124                         if ( timeout ) {
1125                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1126                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
1127                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
1128                                 rs->sr_text = "Operation timed out";
1129                                 break;
1130                         }
1131
1132                         LDAP_BACK_TV_SET( &tv );
1133                         ldap_pvt_thread_yield();
1134                         goto retry;
1135
1136                 case -1:
1137                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1138                                         &rs->sr_err );
1139                         break;
1140
1141
1142                 /* otherwise get the result; if it is not
1143                  * LDAP_SUCCESS, record it in the reply
1144                  * structure (this includes
1145                  * LDAP_COMPARE_{TRUE|FALSE}) */
1146                 default:
1147                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1148                                         &match, &text, NULL, NULL, 1 );
1149                         rs->sr_text = text;
1150                         if ( rc != LDAP_SUCCESS ) {
1151                                 rs->sr_err = rc;
1152                         }
1153                 }
1154         }
1155
1156         /* if the error in the reply structure is not
1157          * LDAP_SUCCESS, try to map it from client
1158          * to server error */
1159         if ( !ERR_OK( rs->sr_err ) ) {
1160                 rs->sr_err = slap_map_api2result( rs );
1161
1162                 /* internal ops ( op->o_conn == NULL )
1163                  * must not reply to client */
1164                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1165
1166                         /* record the (massaged) matched
1167                          * DN into the reply structure */
1168                         rs->sr_matched = match;
1169                 }
1170         }
1171         if ( op->o_conn &&
1172                         ( ( sendok & LDAP_BACK_SENDOK )
1173                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1174         {
1175                 send_ldap_result( op, rs );
1176         }
1177         if ( match ) {
1178                 if ( rs->sr_matched != match ) {
1179                         free( (char *)rs->sr_matched );
1180                 }
1181                 rs->sr_matched = NULL;
1182                 ldap_memfree( match );
1183         }
1184         if ( text ) {
1185                 ldap_memfree( text );
1186         }
1187         rs->sr_text = NULL;
1188         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1189 }
1190
1191 /* return true if bound, false if failed */
1192 int
1193 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1194 {
1195         int             rc = 0;
1196         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1197
1198         assert( lcp != NULL );
1199         assert( *lcp != NULL );
1200
1201         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1202
1203         if ( (*lcp)->lc_refcnt == 1 ) {
1204                 ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1205                 Debug( LDAP_DEBUG_ANY,
1206                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1207                         op->o_log_prefix, li->li_uri,
1208                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1209                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1210                 ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1211
1212                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1213                 (*lcp)->lc_ld = NULL;
1214                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1215
1216                 /* lc here must be the regular lc, reset and ready for init */
1217                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1218                 if ( rc != LDAP_SUCCESS ) {
1219                         rc = 0;
1220                         *lcp = NULL;
1221
1222                 } else {
1223                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1224                         if ( rc == 0 ) {
1225                                 *lcp = NULL;
1226                         }
1227                 }
1228
1229         } else {
1230                 Debug( LDAP_DEBUG_TRACE,
1231                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1232                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1233
1234                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1235                 *lcp = NULL;
1236
1237                 if ( sendok ) {
1238                         rs->sr_err = LDAP_UNAVAILABLE;
1239                         rs->sr_text = "unable to retry";
1240                         send_ldap_result( op, rs );
1241                 }
1242         }
1243
1244         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1245
1246         return rc;
1247 }
1248
1249 static int
1250 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1251 {
1252         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1253         struct berval   binddn = slap_empty_bv;
1254         struct berval   bindcred = slap_empty_bv;
1255         struct berval   ndn;
1256         int             dobind = 0;
1257         int             msgid;
1258         int             rc;
1259
1260         /* don't proxyAuthz if protocol is not LDAPv3 */
1261         switch ( li->li_version ) {
1262         case LDAP_VERSION3:
1263                 break;
1264
1265         case 0:
1266                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1267                         break;
1268                 }
1269                 /* fall thru */
1270
1271         default:
1272                 goto done;
1273         }
1274
1275         if ( op->o_tag == LDAP_REQ_BIND ) {
1276                 ndn = op->o_req_ndn;
1277
1278         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1279                 ndn = op->o_conn->c_ndn;
1280
1281         } else {
1282                 ndn = op->o_ndn;
1283         }
1284
1285         /*
1286          * FIXME: we need to let clients use proxyAuthz
1287          * otherwise we cannot do symmetric pools of servers;
1288          * we have to live with the fact that a user can
1289          * authorize itself as any ID that is allowed
1290          * by the authzTo directive of the "proxyauthzdn".
1291          */
1292         /*
1293          * NOTE: current Proxy Authorization specification
1294          * and implementation do not allow proxy authorization
1295          * control to be provided with Bind requests
1296          */
1297         /*
1298          * if no bind took place yet, but the connection is bound
1299          * and the "proxyauthzdn" is set, then bind as
1300          * "proxyauthzdn" and explicitly add the proxyAuthz
1301          * control to every operation with the dn bound
1302          * to the connection as control value.
1303          */
1304
1305         /* bind as proxyauthzdn only if no idassert mode
1306          * is requested, or if the client's identity
1307          * is authorized */
1308         switch ( li->li_idassert_mode ) {
1309         case LDAP_BACK_IDASSERT_LEGACY:
1310                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1311                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1312                         {
1313                                 binddn = li->li_idassert_authcDN;
1314                                 bindcred = li->li_idassert_passwd;
1315                                 dobind = 1;
1316                         }
1317                 }
1318                 break;
1319
1320         default:
1321                 /* NOTE: rootdn can always idassert */
1322                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1323                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1324                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1325                                 if ( sendok & LDAP_BACK_SENDERR ) {
1326                                         send_ldap_result( op, rs );
1327                                 }
1328                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1329
1330                         } else {
1331                                 rs->sr_err = LDAP_SUCCESS;
1332                                 binddn = slap_empty_bv;
1333                                 bindcred = slap_empty_bv;
1334                                 break;
1335                         }
1336
1337                         goto done;
1338
1339                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1340                         struct berval authcDN;
1341
1342                         if ( BER_BVISNULL( &ndn ) ) {
1343                                 authcDN = slap_empty_bv;
1344
1345                         } else {
1346                                 authcDN = ndn;
1347                         }
1348                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1349                                         &authcDN, &authcDN );
1350                         if ( rs->sr_err != LDAP_SUCCESS ) {
1351                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1352                                         if ( sendok & LDAP_BACK_SENDERR ) {
1353                                                 send_ldap_result( op, rs );
1354                                         }
1355                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1356
1357                                 } else {
1358                                         rs->sr_err = LDAP_SUCCESS;
1359                                         binddn = slap_empty_bv;
1360                                         bindcred = slap_empty_bv;
1361                                         break;
1362                                 }
1363
1364                                 goto done;
1365                         }
1366                 }
1367
1368                 binddn = li->li_idassert_authcDN;
1369                 bindcred = li->li_idassert_passwd;
1370                 dobind = 1;
1371                 break;
1372         }
1373
1374         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1375 #ifdef HAVE_CYRUS_SASL
1376                 void            *defaults = NULL;
1377                 struct berval   authzID = BER_BVNULL;
1378                 int             freeauthz = 0;
1379
1380                 /* if SASL supports native authz, prepare for it */
1381                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1382                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1383                 {
1384                         switch ( li->li_idassert_mode ) {
1385                         case LDAP_BACK_IDASSERT_OTHERID:
1386                         case LDAP_BACK_IDASSERT_OTHERDN:
1387                                 authzID = li->li_idassert_authzID;
1388                                 break;
1389
1390                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1391                                 BER_BVSTR( &authzID, "dn:" );
1392                                 break;
1393
1394                         case LDAP_BACK_IDASSERT_SELF:
1395                                 if ( BER_BVISNULL( &ndn ) ) {
1396                                         /* connection is not authc'd, so don't idassert */
1397                                         BER_BVSTR( &authzID, "dn:" );
1398                                         break;
1399                                 }
1400                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1401                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1402                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1403                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1404                                                 ndn.bv_val, ndn.bv_len + 1 );
1405                                 freeauthz = 1;
1406                                 break;
1407
1408                         default:
1409                                 break;
1410                         }
1411                 }
1412
1413                 if ( li->li_idassert_secprops != NULL ) {
1414                         rs->sr_err = ldap_set_option( lc->lc_ld,
1415                                 LDAP_OPT_X_SASL_SECPROPS,
1416                                 (void *)li->li_idassert_secprops );
1417
1418                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1419                                 rs->sr_err = LDAP_OTHER;
1420                                 if ( sendok & LDAP_BACK_SENDERR ) {
1421                                         send_ldap_result( op, rs );
1422                                 }
1423                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1424                                 goto done;
1425                         }
1426                 }
1427
1428                 defaults = lutil_sasl_defaults( lc->lc_ld,
1429                                 li->li_idassert_sasl_mech.bv_val,
1430                                 li->li_idassert_sasl_realm.bv_val,
1431                                 li->li_idassert_authcID.bv_val,
1432                                 li->li_idassert_passwd.bv_val,
1433                                 authzID.bv_val );
1434
1435                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1436                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1437                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1438                                 defaults );
1439
1440                 rs->sr_err = slap_map_api2result( rs );
1441                 if ( rs->sr_err != LDAP_SUCCESS ) {
1442                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1443                         if ( sendok & LDAP_BACK_SENDERR ) {
1444                                 send_ldap_result( op, rs );
1445                         }
1446
1447                 } else {
1448                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1449                 }
1450
1451                 lutil_sasl_freedefs( defaults );
1452                 if ( freeauthz ) {
1453                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1454                 }
1455
1456                 goto done;
1457 #endif /* HAVE_CYRUS_SASL */
1458         }
1459
1460         switch ( li->li_idassert_authmethod ) {
1461         case LDAP_AUTH_NONE:
1462                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1463                 goto done;
1464
1465         case LDAP_AUTH_SIMPLE:
1466                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1467                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1468                                 &bindcred, NULL, NULL, &msgid );
1469                 break;
1470
1471         default:
1472                 /* unsupported! */
1473                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1474                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1475                 if ( sendok & LDAP_BACK_SENDERR ) {
1476                         send_ldap_result( op, rs );
1477                 }
1478                 goto done;
1479         }
1480
1481         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1482         if ( rc == LDAP_SUCCESS ) {
1483                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1484         }
1485 done:;
1486         return LDAP_BACK_CONN_ISBOUND( lc );
1487 }
1488
1489 /*
1490  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1491  * to existing server-side controls if required; if not,
1492  * the existing server-side controls are placed in *pctrls.
1493  * The caller, after using the controls in client API
1494  * operations, if ( *pctrls != op->o_ctrls ), should
1495  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1496  * The function returns success if the control could
1497  * be added if required, or if it did nothing; in the future,
1498  * it might return some error if it failed.
1499  *
1500  * if no bind took place yet, but the connection is bound
1501  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1502  * and explicitly add proxyAuthz the control to every operation
1503  * with the dn bound to the connection as control value.
1504  *
1505  * If no server-side controls are defined for the operation,
1506  * simply add the proxyAuthz control; otherwise, if the
1507  * proxyAuthz control is not already set, add it as
1508  * the first one
1509  *
1510  * FIXME: is controls order significant for security?
1511  * ANSWER: controls ordering and interoperability
1512  * must be indicated by the specs of each control; if none
1513  * is specified, the order is irrelevant.
1514  */
1515 int
1516 ldap_back_proxy_authz_ctrl(
1517                 ldapconn_t      *lc,
1518                 Operation       *op,
1519                 SlapReply       *rs,
1520                 LDAPControl     ***pctrls )
1521 {
1522         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1523         LDAPControl     **ctrls = NULL;
1524         int             i = 0,
1525                         mode;
1526         struct berval   assertedID,
1527                         ndn;
1528
1529         *pctrls = NULL;
1530
1531         rs->sr_err = LDAP_SUCCESS;
1532
1533         /* don't proxyAuthz if protocol is not LDAPv3 */
1534         switch ( li->li_version ) {
1535         case LDAP_VERSION3:
1536                 break;
1537
1538         case 0:
1539                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1540                         break;
1541                 }
1542                 /* fall thru */
1543
1544         default:
1545                 goto done;
1546         }
1547
1548         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1549          * but if it is not set this test fails.  We need a different
1550          * means to detect if idassert is enabled */
1551         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1552                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1553         {
1554                 goto done;
1555         }
1556
1557         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1558                 goto done;
1559         }
1560
1561         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1562                 ndn = op->o_conn->c_ndn;
1563
1564         } else {
1565                 ndn = op->o_ndn;
1566         }
1567
1568         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1569                 if ( op->o_proxy_authz ) {
1570                         /*
1571                          * FIXME: we do not want to perform proxyAuthz
1572                          * on behalf of the client, because this would
1573                          * be performed with "proxyauthzdn" privileges.
1574                          *
1575                          * This might actually be too strict, since
1576                          * the "proxyauthzdn" authzTo, and each entry's
1577                          * authzFrom attributes may be crafted
1578                          * to avoid unwanted proxyAuthz to take place.
1579                          */
1580 #if 0
1581                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1582                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1583 #endif
1584                         goto done;
1585                 }
1586
1587                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1588                         goto done;
1589                 }
1590
1591                 if ( BER_BVISNULL( &ndn ) ) {
1592                         goto done;
1593                 }
1594
1595                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1596                         goto done;
1597                 }
1598
1599         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1600                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1601                                 /* && ( !BER_BVISNULL( &ndn )
1602                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1603                 {
1604                         /* already asserted in SASL via native authz */
1605                         /* NOTE: the test on lc->lc_bound is used to trap
1606                          * native authorization of anonymous users,
1607                          * since in that case ndn is NULL */
1608                         goto done;
1609                 }
1610
1611         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1612                 int             rc;
1613                 struct berval authcDN;
1614
1615                 if ( BER_BVISNULL( &ndn ) ) {
1616                         authcDN = slap_empty_bv;
1617                 } else {
1618                         authcDN = ndn;
1619                 }
1620                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1621                                 &authcDN, & authcDN );
1622                 if ( rc != LDAP_SUCCESS ) {
1623                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1624                         {
1625                                 /* ndn is not authorized
1626                                  * to use idassert */
1627                                 rs->sr_err = rc;
1628                         }
1629                         goto done;
1630                 }
1631         }
1632
1633         if ( op->o_proxy_authz ) {
1634                 /*
1635                  * FIXME: we can:
1636                  * 1) ignore the already set proxyAuthz control
1637                  * 2) leave it in place, and don't set ours
1638                  * 3) add both
1639                  * 4) reject the operation
1640                  *
1641                  * option (4) is very drastic
1642                  * option (3) will make the remote server reject
1643                  * the operation, thus being equivalent to (4)
1644                  * option (2) will likely break the idassert
1645                  * assumptions, so we cannot accept it;
1646                  * option (1) means that we are contradicting
1647                  * the client's reques.
1648                  *
1649                  * I think (4) is the only correct choice.
1650                  */
1651                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1652                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1653         }
1654
1655         if ( op->o_is_auth_check ) {
1656                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1657
1658         } else {
1659                 mode = li->li_idassert_mode;
1660         }
1661
1662         switch ( mode ) {
1663         case LDAP_BACK_IDASSERT_SELF:
1664                 if ( BER_BVISNULL( &ndn ) ) {
1665                         goto done;
1666                 }
1667                 assertedID = ndn;
1668                 break;
1669
1670         case LDAP_BACK_IDASSERT_LEGACY:
1671                 /* original behavior:
1672                  * assert the client's identity */
1673                 if ( BER_BVISNULL( &ndn ) ) {
1674                         assertedID = slap_empty_bv;
1675                 } else {
1676                         assertedID = ndn;
1677                 }
1678                 break;
1679
1680         case LDAP_BACK_IDASSERT_ANONYMOUS:
1681                 /* assert "anonymous" */
1682                 assertedID = slap_empty_bv;
1683                 break;
1684
1685         case LDAP_BACK_IDASSERT_NOASSERT:
1686                 /* don't assert; bind as proxyauthzdn */
1687                 goto done;
1688
1689         case LDAP_BACK_IDASSERT_OTHERID:
1690         case LDAP_BACK_IDASSERT_OTHERDN:
1691                 /* assert idassert DN */
1692                 assertedID = li->li_idassert_authzID;
1693                 break;
1694
1695         default:
1696                 assert( 0 );
1697         }
1698
1699         if ( BER_BVISNULL( &assertedID ) ) {
1700                 assertedID = slap_empty_bv;
1701         }
1702
1703         /* don't idassert the bound DN (ITS#4497) */
1704         if ( dn_match( &assertedID, &lc->lc_bound_ndn ) ) {
1705                 goto done;
1706         }
1707
1708         if ( op->o_ctrls ) {
1709                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1710                         /* just count ctrls */ ;
1711         }
1712
1713         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1714                         op->o_tmpmemctx );
1715         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1716
1717         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1718         ctrls[ 0 ]->ldctl_iscritical = 1;
1719
1720         switch ( li->li_idassert_mode ) {
1721         /* already in u:ID or dn:DN form */
1722         case LDAP_BACK_IDASSERT_OTHERID:
1723         case LDAP_BACK_IDASSERT_OTHERDN:
1724                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1725                 break;
1726
1727         /* needs the dn: prefix */
1728         default:
1729                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1730                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1731                                 op->o_tmpmemctx );
1732                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1733                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1734                                 assertedID.bv_val, assertedID.bv_len + 1 );
1735                 break;
1736         }
1737
1738         /* Older versions of <draft-weltman-ldapv3-proxy> required
1739          * to encode the value of the authzID (and called it proxyDN);
1740          * this hack provides compatibility with those DSAs that
1741          * implement it this way */
1742         if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
1743                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
1744                 BerElementBuffer        berbuf;
1745                 BerElement              *ber = (BerElement *)&berbuf;
1746                 ber_tag_t               tag;
1747
1748                 ber_init2( ber, 0, LBER_USE_DER );
1749                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1750
1751                 tag = ber_printf( ber, "O", &authzID );
1752                 if ( tag == LBER_ERROR ) {
1753                         rs->sr_err = LDAP_OTHER;
1754                         goto free_ber;
1755                 }
1756
1757                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1758                         rs->sr_err = LDAP_OTHER;
1759                         goto free_ber;
1760                 }
1761
1762 free_ber:;
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         } else if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
1773                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
1774                                         tmp;
1775                 BerElementBuffer        berbuf;
1776                 BerElement              *ber = (BerElement *)&berbuf;
1777                 ber_tag_t               tag;
1778
1779                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
1780                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1781                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1782                         ctrls = NULL;
1783                         rs->sr_err = LDAP_PROTOCOL_ERROR;
1784                         goto done;
1785                 }
1786
1787                 tmp = authzID;
1788                 tmp.bv_val += STRLENOF( "dn:" );
1789                 tmp.bv_len -= STRLENOF( "dn:" );
1790
1791                 ber_init2( ber, 0, LBER_USE_DER );
1792                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1793
1794                 /* apparently, Mozilla API encodes this
1795                  * as "SEQUENCE { LDAPDN }" */
1796                 tag = ber_printf( ber, "{O}", &tmp );
1797                 if ( tag == LBER_ERROR ) {
1798                         rs->sr_err = LDAP_OTHER;
1799                         goto free_ber2;
1800                 }
1801
1802                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1803                         rs->sr_err = LDAP_OTHER;
1804                         goto free_ber2;
1805                 }
1806
1807 free_ber2:;
1808                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1809                 ber_free_buf( ber );
1810
1811                 if ( rs->sr_err != LDAP_SUCCESS ) {
1812                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1813                         ctrls = NULL;
1814                         goto done;
1815                 }
1816
1817                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
1818         }
1819
1820         if ( op->o_ctrls ) {
1821                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1822                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1823                 }
1824         }
1825         ctrls[ i + 1 ] = NULL;
1826
1827 done:;
1828         if ( ctrls == NULL ) {
1829                 ctrls = op->o_ctrls;
1830         }
1831
1832         *pctrls = ctrls;
1833
1834         return rs->sr_err;
1835 }
1836
1837 int
1838 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1839 {
1840         LDAPControl     **ctrls = *pctrls;
1841
1842         /* we assume that the first control is the proxyAuthz
1843          * added by back-ldap, so it's the only one we explicitly
1844          * free */
1845         if ( ctrls && ctrls != op->o_ctrls ) {
1846                 assert( ctrls[ 0 ] != NULL );
1847
1848                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1849                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1850                 }
1851
1852                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
1853         }
1854
1855         *pctrls = NULL;
1856
1857         return 0;
1858 }