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 #ifdef HAVE_TLS
 738 done:;
 739 #endif /* HAVE_TLS */
 740         if ( li->li_idle_timeout && lc ) {
 741                 lc->lc_time = op->o_time;
 742         }
 743
 744         return lc;
 745 }
 746
 747 void
 748 ldap_back_release_conn_lock(
 749         Operation               *op,
 750         SlapReply               *rs,
 751         ldapconn_t              *lc,
 752         int                     dolock )
 753 {
 754         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 755
 756         if ( dolock ) {
 757                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 758         }
 759         assert( lc->lc_refcnt > 0 );
 760         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 761         lc->lc_refcnt--;
 762         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
 763                 ldap_back_freeconn( op, lc, 0 );
 764         }
 765         if ( dolock ) {
 766                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 767         }
 768 }
 769
 770 /*
 771  * ldap_back_dobind
 772  *
 773  * Note: as the check for the value of lc->lc_bound was already here, I removed
 774  * it from all the callers, and I made the function return the flag, so
 775  * it can be used to simplify the check.
 776  *
 777  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 778  */
 779 static int
 780 ldap_back_dobind_int(
 781         ldapconn_t              *lc,
 782         Operation               *op,
 783         SlapReply               *rs,
 784         ldap_back_send_t        sendok,
 785         int                     retries,
 786         int                     dolock )
 787 {
 788         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 789
 790         int             rc, binding = 0;
 791         ber_int_t       msgid;
 792
 793         assert( retries >= 0 );
 794
 795 retry_lock:;
 796         if ( dolock ) {
 797                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 798         }
 799
 800         if ( binding == 0 ) {
 801                 /* check if already bound */
 802                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 803                 if ( rc ) {
 804                         lc->lc_binding--;
 805                         if ( dolock ) {
 806                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 807                         }
 808                         return rc;
 809                 }
 810
 811                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 812                         /* if someone else is about to bind it, give up and retry */
 813                         if ( dolock ) {
 814                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 815                         }
 816                         ldap_pvt_thread_yield();
 817                         goto retry_lock;
 818
 819                 } else {
 820                         /* otherwise this thread will bind it */
 821                         LDAP_BACK_CONN_BINDING_SET( lc );
 822                         binding = 1;
 823                 }
 824         }
 825
 826         /* wait for pending operations to finish */
 827         /* FIXME: may become a bottleneck! */
 828         if ( lc->lc_refcnt != lc->lc_binding ) {
 829                 if ( dolock ) {
 830                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 831                 }
 832                 ldap_pvt_thread_yield();
 833                 goto retry_lock;
 834         }
 835
 836         if ( dolock ) {
 837                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 838         }
 839
 840 #if 0
 841         while ( lc->lc_refcnt > 1 ) {
 842                 ldap_pvt_thread_yield();
 843                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 844                 if ( rc ) {
 845                         return rc;
 846                 }
 847         }
 848
 849         if ( dolock ) {
 850                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 851         }
 852         LDAP_BACK_CONN_BINDING_SET( lc );
 853         if ( dolock ) {
 854                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 855         }
 856 #endif
 857
 858         /*
 859          * FIXME: we need to let clients use proxyAuthz
 860          * otherwise we cannot do symmetric pools of servers;
 861          * we have to live with the fact that a user can
 862          * authorize itself as any ID that is allowed
 863          * by the authzTo directive of the "proxyauthzdn".
 864          */
 865         /*
 866          * NOTE: current Proxy Authorization specification
 867          * and implementation do not allow proxy authorization
 868          * control to be provided with Bind requests
 869          */
 870         /*
 871          * if no bind took place yet, but the connection is bound
 872          * and the "idassert-authcDN" (or other ID) is set,
 873          * then bind as the asserting identity and explicitly
 874          * add the proxyAuthz control to every operation with the
 875          * dn bound to the connection as control value.
 876          * This is done also if this is the authrizing backend,
 877          * but the "override" flag is given to idassert.
 878          * It allows to use SASL bind and yet proxyAuthz users
 879          */
 880         if ( op->o_conn != NULL &&
 881                         !op->o_do_not_cache &&
 882                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 883                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 884         {
 885                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok );
 886                 goto done;
 887         }
 888
 889 #ifdef HAVE_CYRUS_SASL
 890         if ( LDAP_BACK_CONN_ISPRIV( lc )
 891                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 892         {
 893                 void            *defaults = NULL;
 894
 895                 if ( li->li_acl_secprops != NULL ) {
 896                         rc = ldap_set_option( lc->lc_ld,
 897                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 898
 899                         if ( rc != LDAP_OPT_SUCCESS ) {
 900                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 901                                         "(%s,SECPROPS,\"%s\") failed!\n",
 902                                         li->li_uri, li->li_acl_secprops, 0 );
 903                                 goto done;
 904                         }
 905                 }
 906
 907                 defaults = lutil_sasl_defaults( lc->lc_ld,
 908                                 li->li_acl_sasl_mech.bv_val,
 909                                 li->li_acl_sasl_realm.bv_val,
 910                                 li->li_acl_authcID.bv_val,
 911                                 li->li_acl_passwd.bv_val,
 912                                 NULL );
 913
 914                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 915                                 li->li_acl_authcDN.bv_val,
 916                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 917                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 918                                 defaults );
 919
 920                 lutil_sasl_freedefs( defaults );
 921
 922                 rs->sr_err = slap_map_api2result( rs );
 923                 if ( rs->sr_err != LDAP_SUCCESS ) {
 924                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 925                         send_ldap_result( op, rs );
 926
 927                 } else {
 928                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 929                 }
 930                 goto done;
 931         }
 932 #endif /* HAVE_CYRUS_SASL */
 933
 934 retry:;
 935         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 936                         lc->lc_bound_ndn.bv_val,
 937                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 938                         NULL, NULL, &msgid );
 939
 940         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 941                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 942                         if ( dolock ) {
 943                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 944                         }
 945
 946                         assert( lc->lc_refcnt > 0 );
 947                         if ( lc->lc_refcnt == 1 ) {
 948                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 949                                 lc->lc_ld = NULL;
 950
 951                                 /* lc here must be the regular lc, reset and ready for init */
 952                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 953                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 954                                         lc->lc_binding--;
 955                                         lc->lc_refcnt = 0;
 956                                 }
 957                         }
 958
 959                         if ( dolock ) {
 960                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 961                         }
 962
 963                         if ( rs->sr_err == LDAP_SUCCESS ) {
 964                                 if ( retries > 0 ) {
 965                                         retries--;
 966                                 }
 967                                 goto retry;
 968                         }
 969
 970                 } else {
 971                         if ( dolock ) {
 972                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 973                         }
 974                         lc->lc_binding--;
 975                         if ( dolock ) {
 976                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 977                         }
 978                 }
 979
 980                 ldap_back_freeconn( op, lc, dolock );
 981                 rs->sr_err = slap_map_api2result( rs );
 982
 983                 return 0;
 984         }
 985
 986         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
 987         if ( rc == LDAP_SUCCESS ) {
 988                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 989         }
 990
 991 done:;
 992         lc->lc_binding--;
 993         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 994         rc = LDAP_BACK_CONN_ISBOUND( lc );
 995         if ( !rc ) {
 996                 ldap_back_release_conn_lock( op, rs, lc, dolock );
 997         }
 998
 999         return rc;
1000 }
1001
1002 int
1003 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1004 {
1005         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1006
1007         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
1008 }
1009
1010 /*
1011  * ldap_back_default_rebind
1012  *
1013  * This is a callback used for chasing referrals using the same
1014  * credentials as the original user on this session.
1015  */
1016 static int
1017 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1018         ber_int_t msgid, void *params )
1019 {
1020         ldapconn_t      *lc = (ldapconn_t *)params;
1021
1022 #ifdef HAVE_TLS
1023         /* ... otherwise we couldn't get here */
1024         assert( lc != NULL );
1025
1026         if ( !ldap_tls_inplace( ld ) ) {
1027                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1028                                 rc;
1029                 const char      *text = NULL;
1030
1031                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1032                         LDAP_BACK_RETRY_DEFAULT, &text );
1033                 if ( rc != LDAP_SUCCESS ) {
1034                         return rc;
1035                 }
1036         }
1037 #endif /* HAVE_TLS */
1038
1039         /* FIXME: add checks on the URL/identity? */
1040
1041         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
1042                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1043 }
1044
1045 int
1046 ldap_back_op_result(
1047                 ldapconn_t              *lc,
1048                 Operation               *op,
1049                 SlapReply               *rs,
1050                 ber_int_t               msgid,
1051                 time_t                  timeout,
1052                 ldap_back_send_t        sendok )
1053 {
1054         char            *match = NULL;
1055         LDAPMessage     *res = NULL;
1056         char            *text = NULL;
1057
1058 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1059
1060         rs->sr_text = NULL;
1061         rs->sr_matched = NULL;
1062
1063         /* if the error recorded in the reply corresponds
1064          * to a successful state, get the error from the
1065          * remote server response */
1066         if ( ERR_OK( rs->sr_err ) ) {
1067                 int             rc;
1068                 struct timeval  tv;
1069
1070                 if ( timeout ) {
1071                         tv.tv_sec = timeout;
1072                         tv.tv_usec = 0;
1073
1074                 } else {
1075                         LDAP_BACK_TV_SET( &tv );
1076                 }
1077
1078 retry:;
1079                 /* if result parsing fails, note the failure reason */
1080                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1081                 switch ( rc ) {
1082                 case 0:
1083                         if ( timeout ) {
1084                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1085                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
1086                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
1087                                 rs->sr_text = "Operation timed out";
1088                                 break;
1089                         }
1090
1091                         LDAP_BACK_TV_SET( &tv );
1092                         ldap_pvt_thread_yield();
1093                         goto retry;
1094
1095                 case -1:
1096                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1097                                         &rs->sr_err );
1098                         break;
1099
1100
1101                 /* otherwise get the result; if it is not
1102                  * LDAP_SUCCESS, record it in the reply
1103                  * structure (this includes
1104                  * LDAP_COMPARE_{TRUE|FALSE}) */
1105                 default:
1106                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1107                                         &match, &text, NULL, NULL, 1 );
1108                         rs->sr_text = text;
1109                         if ( rc != LDAP_SUCCESS ) {
1110                                 rs->sr_err = rc;
1111                         }
1112                 }
1113         }
1114
1115         /* if the error in the reply structure is not
1116          * LDAP_SUCCESS, try to map it from client
1117          * to server error */
1118         if ( !ERR_OK( rs->sr_err ) ) {
1119                 rs->sr_err = slap_map_api2result( rs );
1120
1121                 /* internal ops ( op->o_conn == NULL )
1122                  * must not reply to client */
1123                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1124
1125                         /* record the (massaged) matched
1126                          * DN into the reply structure */
1127                         rs->sr_matched = match;
1128                 }
1129         }
1130         if ( op->o_conn &&
1131                         ( ( sendok & LDAP_BACK_SENDOK )
1132                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1133         {
1134                 send_ldap_result( op, rs );
1135         }
1136         if ( match ) {
1137                 if ( rs->sr_matched != match ) {
1138                         free( (char *)rs->sr_matched );
1139                 }
1140                 rs->sr_matched = NULL;
1141                 ldap_memfree( match );
1142         }
1143         if ( text ) {
1144                 ldap_memfree( text );
1145         }
1146         rs->sr_text = NULL;
1147         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1148 }
1149
1150 /* return true if bound, false if failed */
1151 int
1152 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1153 {
1154         int             rc = 0;
1155         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1156
1157         assert( lcp != NULL );
1158         assert( *lcp != NULL );
1159
1160         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1161
1162         if ( (*lcp)->lc_refcnt == 1 ) {
1163                 Debug( LDAP_DEBUG_ANY,
1164                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1165                         op->o_log_prefix, li->li_uri,
1166                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1167                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1168
1169                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1170                 (*lcp)->lc_ld = NULL;
1171                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1172
1173                 /* lc here must be the regular lc, reset and ready for init */
1174                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1175                 if ( rc != LDAP_SUCCESS ) {
1176                         rc = 0;
1177                         *lcp = NULL;
1178
1179                 } else {
1180                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1181                         if ( rc == 0 ) {
1182                                 *lcp = NULL;
1183                         }
1184                 }
1185
1186         } else {
1187                 Debug( LDAP_DEBUG_TRACE,
1188                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1189                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1190
1191                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1192                 *lcp = NULL;
1193
1194                 if ( sendok ) {
1195                         rs->sr_err = LDAP_UNAVAILABLE;
1196                         rs->sr_text = "unable to retry";
1197                         send_ldap_result( op, rs );
1198                 }
1199         }
1200
1201         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1202
1203         return rc;
1204 }
1205
1206 static int
1207 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1208 {
1209         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1210         struct berval   binddn = slap_empty_bv;
1211         struct berval   bindcred = slap_empty_bv;
1212         struct berval   ndn;
1213         int             dobind = 0;
1214         int             msgid;
1215         int             rc;
1216
1217         /* don't proxyAuthz if protocol is not LDAPv3 */
1218         switch ( li->li_version ) {
1219         case LDAP_VERSION3:
1220                 break;
1221
1222         case 0:
1223                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1224                         break;
1225                 }
1226                 /* fall thru */
1227
1228         default:
1229                 goto done;
1230         }
1231
1232         if ( op->o_tag == LDAP_REQ_BIND ) {
1233                 ndn = op->o_req_ndn;
1234
1235         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1236                 ndn = op->o_conn->c_ndn;
1237
1238         } else {
1239                 ndn = op->o_ndn;
1240         }
1241
1242         /*
1243          * FIXME: we need to let clients use proxyAuthz
1244          * otherwise we cannot do symmetric pools of servers;
1245          * we have to live with the fact that a user can
1246          * authorize itself as any ID that is allowed
1247          * by the authzTo directive of the "proxyauthzdn".
1248          */
1249         /*
1250          * NOTE: current Proxy Authorization specification
1251          * and implementation do not allow proxy authorization
1252          * control to be provided with Bind requests
1253          */
1254         /*
1255          * if no bind took place yet, but the connection is bound
1256          * and the "proxyauthzdn" is set, then bind as
1257          * "proxyauthzdn" and explicitly add the proxyAuthz
1258          * control to every operation with the dn bound
1259          * to the connection as control value.
1260          */
1261
1262         /* bind as proxyauthzdn only if no idassert mode
1263          * is requested, or if the client's identity
1264          * is authorized */
1265         switch ( li->li_idassert_mode ) {
1266         case LDAP_BACK_IDASSERT_LEGACY:
1267                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1268                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1269                         {
1270                                 binddn = li->li_idassert_authcDN;
1271                                 bindcred = li->li_idassert_passwd;
1272                                 dobind = 1;
1273                         }
1274                 }
1275                 break;
1276
1277         default:
1278                 /* NOTE: rootdn can always idassert */
1279                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1280                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1281                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1282                                 if ( sendok & LDAP_BACK_SENDERR ) {
1283                                         send_ldap_result( op, rs );
1284                                 }
1285                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1286
1287                         } else {
1288                                 rs->sr_err = LDAP_SUCCESS;
1289                                 binddn = slap_empty_bv;
1290                                 bindcred = slap_empty_bv;
1291                                 break;
1292                         }
1293
1294                         goto done;
1295
1296                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1297                         struct berval authcDN;
1298
1299                         if ( BER_BVISNULL( &ndn ) ) {
1300                                 authcDN = slap_empty_bv;
1301
1302                         } else {
1303                                 authcDN = ndn;
1304                         }
1305                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1306                                         &authcDN, &authcDN );
1307                         if ( rs->sr_err != LDAP_SUCCESS ) {
1308                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1309                                         if ( sendok & LDAP_BACK_SENDERR ) {
1310                                                 send_ldap_result( op, rs );
1311                                         }
1312                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1313
1314                                 } else {
1315                                         rs->sr_err = LDAP_SUCCESS;
1316                                         binddn = slap_empty_bv;
1317                                         bindcred = slap_empty_bv;
1318                                         break;
1319                                 }
1320
1321                                 goto done;
1322                         }
1323                 }
1324
1325                 binddn = li->li_idassert_authcDN;
1326                 bindcred = li->li_idassert_passwd;
1327                 dobind = 1;
1328                 break;
1329         }
1330
1331         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1332 #ifdef HAVE_CYRUS_SASL
1333                 void            *defaults = NULL;
1334                 struct berval   authzID = BER_BVNULL;
1335                 int             freeauthz = 0;
1336
1337                 /* if SASL supports native authz, prepare for it */
1338                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1339                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1340                 {
1341                         switch ( li->li_idassert_mode ) {
1342                         case LDAP_BACK_IDASSERT_OTHERID:
1343                         case LDAP_BACK_IDASSERT_OTHERDN:
1344                                 authzID = li->li_idassert_authzID;
1345                                 break;
1346
1347                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1348                                 BER_BVSTR( &authzID, "dn:" );
1349                                 break;
1350
1351                         case LDAP_BACK_IDASSERT_SELF:
1352                                 if ( BER_BVISNULL( &ndn ) ) {
1353                                         /* connection is not authc'd, so don't idassert */
1354                                         BER_BVSTR( &authzID, "dn:" );
1355                                         break;
1356                                 }
1357                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1358                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1359                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1360                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1361                                                 ndn.bv_val, ndn.bv_len + 1 );
1362                                 freeauthz = 1;
1363                                 break;
1364
1365                         default:
1366                                 break;
1367                         }
1368                 }
1369
1370                 if ( li->li_idassert_secprops != NULL ) {
1371                         rs->sr_err = ldap_set_option( lc->lc_ld,
1372                                 LDAP_OPT_X_SASL_SECPROPS,
1373                                 (void *)li->li_idassert_secprops );
1374
1375                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1376                                 rs->sr_err = LDAP_OTHER;
1377                                 if ( sendok & LDAP_BACK_SENDERR ) {
1378                                         send_ldap_result( op, rs );
1379                                 }
1380                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1381                                 goto done;
1382                         }
1383                 }
1384
1385                 defaults = lutil_sasl_defaults( lc->lc_ld,
1386                                 li->li_idassert_sasl_mech.bv_val,
1387                                 li->li_idassert_sasl_realm.bv_val,
1388                                 li->li_idassert_authcID.bv_val,
1389                                 li->li_idassert_passwd.bv_val,
1390                                 authzID.bv_val );
1391
1392                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1393                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1394                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1395                                 defaults );
1396
1397                 rs->sr_err = slap_map_api2result( rs );
1398                 if ( rs->sr_err != LDAP_SUCCESS ) {
1399                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1400                         if ( sendok & LDAP_BACK_SENDERR ) {
1401                                 send_ldap_result( op, rs );
1402                         }
1403
1404                 } else {
1405                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1406                 }
1407
1408                 lutil_sasl_freedefs( defaults );
1409                 if ( freeauthz ) {
1410                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1411                 }
1412
1413                 goto done;
1414 #endif /* HAVE_CYRUS_SASL */
1415         }
1416
1417         switch ( li->li_idassert_authmethod ) {
1418         case LDAP_AUTH_NONE:
1419                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1420                 goto done;
1421
1422         case LDAP_AUTH_SIMPLE:
1423                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1424                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1425                                 &bindcred, NULL, NULL, &msgid );
1426                 break;
1427
1428         default:
1429                 /* unsupported! */
1430                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1431                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1432                 if ( sendok & LDAP_BACK_SENDERR ) {
1433                         send_ldap_result( op, rs );
1434                 }
1435                 goto done;
1436         }
1437
1438         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1439         if ( rc == LDAP_SUCCESS ) {
1440                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1441         }
1442 done:;
1443         return LDAP_BACK_CONN_ISBOUND( lc );
1444 }
1445
1446 /*
1447  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1448  * to existing server-side controls if required; if not,
1449  * the existing server-side controls are placed in *pctrls.
1450  * The caller, after using the controls in client API
1451  * operations, if ( *pctrls != op->o_ctrls ), should
1452  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1453  * The function returns success if the control could
1454  * be added if required, or if it did nothing; in the future,
1455  * it might return some error if it failed.
1456  *
1457  * if no bind took place yet, but the connection is bound
1458  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1459  * and explicitly add proxyAuthz the control to every operation
1460  * with the dn bound to the connection as control value.
1461  *
1462  * If no server-side controls are defined for the operation,
1463  * simply add the proxyAuthz control; otherwise, if the
1464  * proxyAuthz control is not already set, add it as
1465  * the first one
1466  *
1467  * FIXME: is controls order significant for security?
1468  * ANSWER: controls ordering and interoperability
1469  * must be indicated by the specs of each control; if none
1470  * is specified, the order is irrelevant.
1471  */
1472 int
1473 ldap_back_proxy_authz_ctrl(
1474                 ldapconn_t      *lc,
1475                 Operation       *op,
1476                 SlapReply       *rs,
1477                 LDAPControl     ***pctrls )
1478 {
1479         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1480         LDAPControl     **ctrls = NULL;
1481         int             i = 0,
1482                         mode;
1483         struct berval   assertedID,
1484                         ndn;
1485
1486         *pctrls = NULL;
1487
1488         rs->sr_err = LDAP_SUCCESS;
1489
1490         /* don't proxyAuthz if protocol is not LDAPv3 */
1491         switch ( li->li_version ) {
1492         case LDAP_VERSION3:
1493                 break;
1494
1495         case 0:
1496                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1497                         break;
1498                 }
1499                 /* fall thru */
1500
1501         default:
1502                 goto done;
1503         }
1504
1505         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1506          * but if it is not set this test fails.  We need a different
1507          * means to detect if idassert is enabled */
1508         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1509                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1510         {
1511                 goto done;
1512         }
1513
1514         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1515                 goto done;
1516         }
1517
1518         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1519                 ndn = op->o_conn->c_ndn;
1520
1521         } else {
1522                 ndn = op->o_ndn;
1523         }
1524
1525         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1526                 if ( op->o_proxy_authz ) {
1527                         /*
1528                          * FIXME: we do not want to perform proxyAuthz
1529                          * on behalf of the client, because this would
1530                          * be performed with "proxyauthzdn" privileges.
1531                          *
1532                          * This might actually be too strict, since
1533                          * the "proxyauthzdn" authzTo, and each entry's
1534                          * authzFrom attributes may be crafted
1535                          * to avoid unwanted proxyAuthz to take place.
1536                          */
1537 #if 0
1538                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1539                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1540 #endif
1541                         goto done;
1542                 }
1543
1544                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1545                         goto done;
1546                 }
1547
1548                 if ( BER_BVISNULL( &ndn ) ) {
1549                         goto done;
1550                 }
1551
1552                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1553                         goto done;
1554                 }
1555
1556         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1557                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1558                                 /* && ( !BER_BVISNULL( &ndn )
1559                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1560                 {
1561                         /* already asserted in SASL via native authz */
1562                         /* NOTE: the test on lc->lc_bound is used to trap
1563                          * native authorization of anonymous users,
1564                          * since in that case ndn is NULL */
1565                         goto done;
1566                 }
1567
1568         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1569                 int             rc;
1570                 struct berval authcDN;
1571
1572                 if ( BER_BVISNULL( &ndn ) ) {
1573                         authcDN = slap_empty_bv;
1574                 } else {
1575                         authcDN = ndn;
1576                 }
1577                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1578                                 &authcDN, & authcDN );
1579                 if ( rc != LDAP_SUCCESS ) {
1580                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1581                         {
1582                                 /* ndn is not authorized
1583                                  * to use idassert */
1584                                 rs->sr_err = rc;
1585                         }
1586                         goto done;
1587                 }
1588         }
1589
1590         if ( op->o_proxy_authz ) {
1591                 /*
1592                  * FIXME: we can:
1593                  * 1) ignore the already set proxyAuthz control
1594                  * 2) leave it in place, and don't set ours
1595                  * 3) add both
1596                  * 4) reject the operation
1597                  *
1598                  * option (4) is very drastic
1599                  * option (3) will make the remote server reject
1600                  * the operation, thus being equivalent to (4)
1601                  * option (2) will likely break the idassert
1602                  * assumptions, so we cannot accept it;
1603                  * option (1) means that we are contradicting
1604                  * the client's reques.
1605                  *
1606                  * I think (4) is the only correct choice.
1607                  */
1608                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1609                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1610         }
1611
1612         if ( op->o_is_auth_check ) {
1613                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1614
1615         } else {
1616                 mode = li->li_idassert_mode;
1617         }
1618
1619         switch ( mode ) {
1620         case LDAP_BACK_IDASSERT_SELF:
1621                 if ( BER_BVISNULL( &ndn ) ) {
1622                         goto done;
1623                 }
1624                 assertedID = ndn;
1625                 break;
1626
1627         case LDAP_BACK_IDASSERT_LEGACY:
1628                 /* original behavior:
1629                  * assert the client's identity */
1630                 if ( BER_BVISNULL( &ndn ) ) {
1631                         assertedID = slap_empty_bv;
1632                 } else {
1633                         assertedID = ndn;
1634                 }
1635                 break;
1636
1637         case LDAP_BACK_IDASSERT_ANONYMOUS:
1638                 /* assert "anonymous" */
1639                 assertedID = slap_empty_bv;
1640                 break;
1641
1642         case LDAP_BACK_IDASSERT_NOASSERT:
1643                 /* don't assert; bind as proxyauthzdn */
1644                 goto done;
1645
1646         case LDAP_BACK_IDASSERT_OTHERID:
1647         case LDAP_BACK_IDASSERT_OTHERDN:
1648                 /* assert idassert DN */
1649                 assertedID = li->li_idassert_authzID;
1650                 break;
1651
1652         default:
1653                 assert( 0 );
1654         }
1655
1656         if ( BER_BVISNULL( &assertedID ) ) {
1657                 assertedID = slap_empty_bv;
1658         }
1659
1660         /* don't idassert the bound DN (ITS#4497) */
1661         if ( dn_match( &assertedID, &lc->lc_bound_ndn ) ) {
1662                 goto done;
1663         }
1664
1665         if ( op->o_ctrls ) {
1666                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1667                         /* just count ctrls */ ;
1668         }
1669
1670         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1671                         op->o_tmpmemctx );
1672         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1673
1674         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1675         ctrls[ 0 ]->ldctl_iscritical = 1;
1676
1677         switch ( li->li_idassert_mode ) {
1678         /* already in u:ID or dn:DN form */
1679         case LDAP_BACK_IDASSERT_OTHERID:
1680         case LDAP_BACK_IDASSERT_OTHERDN:
1681                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1682                 break;
1683
1684         /* needs the dn: prefix */
1685         default:
1686                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1687                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1688                                 op->o_tmpmemctx );
1689                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1690                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1691                                 assertedID.bv_val, assertedID.bv_len + 1 );
1692                 break;
1693         }
1694
1695         /* Older versions of <draft-weltman-ldapv3-proxy> required
1696          * to encode the value of the authzID (and called it proxyDN);
1697          * this hack provides compatibility with those DSAs that
1698          * implement it this way */
1699         if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
1700                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
1701                 BerElementBuffer        berbuf;
1702                 BerElement              *ber = (BerElement *)&berbuf;
1703                 ber_tag_t               tag;
1704
1705                 ber_init2( ber, 0, LBER_USE_DER );
1706                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1707
1708                 tag = ber_printf( ber, "O", &authzID );
1709                 if ( tag == LBER_ERROR ) {
1710                         rs->sr_err = LDAP_OTHER;
1711                         goto free_ber;
1712                 }
1713
1714                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1715                         rs->sr_err = LDAP_OTHER;
1716                         goto free_ber;
1717                 }
1718
1719 free_ber:;
1720                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1721                 ber_free_buf( ber );
1722
1723                 if ( rs->sr_err != LDAP_SUCCESS ) {
1724                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1725                         ctrls = NULL;
1726                         goto done;
1727                 }
1728
1729         } else if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
1730                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
1731                                         tmp;
1732                 BerElementBuffer        berbuf;
1733                 BerElement              *ber = (BerElement *)&berbuf;
1734                 ber_tag_t               tag;
1735
1736                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
1737                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1738                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1739                         ctrls = NULL;
1740                         rs->sr_err = LDAP_PROTOCOL_ERROR;
1741                         goto done;
1742                 }
1743
1744                 tmp = authzID;
1745                 tmp.bv_val += STRLENOF( "dn:" );
1746                 tmp.bv_len -= STRLENOF( "dn:" );
1747
1748                 ber_init2( ber, 0, LBER_USE_DER );
1749                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1750
1751                 /* apparently, Mozilla API encodes this
1752                  * as "SEQUENCE { LDAPDN }" */
1753                 tag = ber_printf( ber, "{O}", &tmp );
1754                 if ( tag == LBER_ERROR ) {
1755                         rs->sr_err = LDAP_OTHER;
1756                         goto free_ber2;
1757                 }
1758
1759                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1760                         rs->sr_err = LDAP_OTHER;
1761                         goto free_ber2;
1762                 }
1763
1764 free_ber2:;
1765                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1766                 ber_free_buf( ber );
1767
1768                 if ( rs->sr_err != LDAP_SUCCESS ) {
1769                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1770                         ctrls = NULL;
1771                         goto done;
1772                 }
1773
1774                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
1775         }
1776
1777         if ( op->o_ctrls ) {
1778                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1779                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1780                 }
1781         }
1782         ctrls[ i + 1 ] = NULL;
1783
1784 done:;
1785         if ( ctrls == NULL ) {
1786                 ctrls = op->o_ctrls;
1787         }
1788
1789         *pctrls = ctrls;
1790
1791         return rs->sr_err;
1792 }
1793
1794 int
1795 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1796 {
1797         LDAPControl     **ctrls = *pctrls;
1798
1799         /* we assume that the first control is the proxyAuthz
1800          * added by back-ldap, so it's the only one we explicitly
1801          * free */
1802         if ( ctrls && ctrls != op->o_ctrls ) {
1803                 assert( ctrls[ 0 ] != NULL );
1804
1805                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1806                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1807                 }
1808
1809                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
1810         }
1811
1812         *pctrls = NULL;
1813
1814         return 0;
1815 }