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 #if PRINT_CONNTREE > 0
  45 static void
  46 ravl_print( Avlnode *root, int depth )
  47 {
  48         int             i;
  49         ldapconn_t      *lc;
  50
  51         if ( root == 0 ) {
  52                 return;
  53         }
  54
  55         ravl_print( root->avl_right, depth+1 );
  56
  57         for ( i = 0; i < depth; i++ ) {
  58                 fprintf( stderr, "-" );
  59         }
  60
  61         lc = root->avl_data;
  62         fprintf( stderr, "lc=%p local=\"%s\" conn=%p %s refcnt=%d\n",
  63                 (void *)lc,
  64                 lc->lc_local_ndn.bv_val ? lc->lc_local_ndn.bv_val : "",
  65                 (void *)lc->lc_conn,
  66                 avl_bf2str( root->avl_bf ), lc->lc_refcnt );
  67
  68         ravl_print( root->avl_left, depth+1 );
  69 }
  70
  71 static void
  72 myprint( Avlnode *root, char *msg )
  73 {
  74         fprintf( stderr, "========> %s\n", msg );
  75
  76         if ( root == 0 ) {
  77                 fprintf( stderr, "\tNULL\n" );
  78
  79         } else {
  80                 ravl_print( root, 0 );
  81         }
  82
  83         fprintf( stderr, "<======== %s\n", msg );
  84 }
  85 #endif /* PRINT_CONNTREE */
  86
  87 static int
  88 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  89
  90 static int
  91 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  92
  93 static int
  94 ldap_back_conndnlc_cmp( const void *c1, const void *c2 );
  95
  96 int
  97 ldap_back_bind( Operation *op, SlapReply *rs )
  98 {
  99         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 100         ldapconn_t      *lc;
 101
 102         int rc = 0;
 103         ber_int_t msgid;
 104
 105         lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR );
 106         if ( !lc ) {
 107                 return rs->sr_err;
 108         }
 109
 110         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
 111                 ch_free( lc->lc_bound_ndn.bv_val );
 112                 BER_BVZERO( &lc->lc_bound_ndn );
 113         }
 114         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 115
 116         /* method is always LDAP_AUTH_SIMPLE if we got here */
 117         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
 118                         LDAP_SASL_SIMPLE,
 119                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
 120         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
 121
 122         if ( rc == LDAP_SUCCESS ) {
 123                 /* If defined, proxyAuthz will be used also when
 124                  * back-ldap is the authorizing backend; for this
 125                  * purpose, a successful bind is followed by a
 126                  * bind with the configured identity assertion */
 127                 /* NOTE: use with care */
 128                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
 129                         ldap_back_proxy_authz_bind( lc, op, rs, LDAP_BACK_SENDERR );
 130                         if ( !LDAP_BACK_CONN_ISBOUND( lc ) ) {
 131                                 rc = 1;
 132                         }
 133                         goto done;
 134                 }
 135
 136                 /* rebind is now done inside ldap_back_proxy_authz_bind()
 137                  * in case of success */
 138                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 139                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
 140
 141                 if ( LDAP_BACK_SAVECRED( li ) ) {
 142                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
 143                                 memset( lc->lc_cred.bv_val, 0,
 144                                                 lc->lc_cred.bv_len );
 145                         }
 146                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
 147                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
 148                 }
 149         }
 150 done:;
 151
 152         assert( lc->lc_binding == 1 );
 153         lc->lc_binding = 0;
 154
 155         /* must re-insert if local DN changed as result of bind */
 156         if ( !LDAP_BACK_CONN_ISBOUND( lc )
 157                 || ( LDAP_BACK_CONN_ISBOUND( lc )
 158                         && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) )
 159         {
 160                 int             lerr = -1;
 161                 ldapconn_t      *tmplc;
 162
 163                 /* wait for all other ops to release the connection */
 164 retry_lock:;
 165                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 166                 if ( lc->lc_refcnt > 1 ) {
 167                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 168                         ldap_pvt_thread_yield();
 169                         goto retry_lock;
 170                 }
 171
 172                 assert( lc->lc_refcnt == 1 );
 173                 tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 174                                 ldap_back_conndnlc_cmp );
 175                 assert( tmplc == NULL || lc == tmplc );
 176
 177                 /* delete all cached connections with the current connection */
 178                 if ( LDAP_BACK_SINGLECONN( li ) ) {
 179                         while ( ( tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc, ldap_back_conn_cmp ) ) != NULL )
 180                         {
 181                                 Debug( LDAP_DEBUG_TRACE,
 182                                         "=>ldap_back_bind: destroying conn %ld (refcnt=%u)\n",
 183                                         LDAP_BACK_PCONN_ID( lc->lc_conn ), lc->lc_refcnt, 0 );
 184
 185                                 if ( tmplc->lc_refcnt != 0 ) {
 186                                         /* taint it */
 187                                         LDAP_BACK_CONN_TAINTED_SET( tmplc );
 188
 189                                 } else {
 190                                         /*
 191                                          * Needs a test because the handler may be corrupted,
 192                                          * and calling ldap_unbind on a corrupted header results
 193                                          * in a segmentation fault
 194                                          */
 195                                         ldap_back_conn_free( tmplc );
 196                                 }
 197                         }
 198                 }
 199
 200                 if ( LDAP_BACK_CONN_ISBOUND( lc ) ) {
 201                         ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 202                         if ( be_isroot_dn( op->o_bd, &op->o_req_ndn ) ) {
 203                                 lc->lc_conn = LDAP_BACK_PCONN_SET( op );
 204                         }
 205                         lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 206                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
 207                 }
 208
 209 #if PRINT_CONNTREE > 0
 210                 myprint( li->li_conninfo.lai_tree, "ldap_back_bind" );
 211 #endif /* PRINT_CONNTREE */
 212
 213                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 214                 switch ( lerr ) {
 215                 case 0:
 216                         break;
 217
 218                 case -1:
 219                         /* duplicate; someone else successfully bound
 220                          * on the same connection with the same identity;
 221                          * we can do this because lc_refcnt == 1 */
 222                         ldap_back_conn_free( lc );
 223                         lc = NULL;
 224                 }
 225         }
 226
 227         if ( lc != NULL ) {
 228                 ldap_back_release_conn( op, rs, lc );
 229         }
 230
 231         return( rc );
 232 }
 233
 234 /*
 235  * ldap_back_conndn_cmp
 236  *
 237  * compares two ldapconn_t based on the value of the conn pointer
 238  * and of the local DN; used by avl stuff for insert, lookup
 239  * and direct delete
 240  */
 241 int
 242 ldap_back_conndn_cmp( const void *c1, const void *c2 )
 243 {
 244         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 245         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 246         int rc;
 247
 248         /* If local DNs don't match, it is definitely not a match */
 249         /* For shared sessions, conn is NULL. Only explicitly
 250          * bound sessions will have non-NULL conn.
 251          */
 252         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 253         if ( rc == 0 ) {
 254                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 255         }
 256
 257         return rc;
 258 }
 259
 260 /*
 261  * ldap_back_conndnlc_cmp
 262  *
 263  * compares two ldapconn_t based on the value of the conn pointer,
 264  * the local DN and the lc pointer; used by avl stuff for insert, lookup
 265  * and direct delete
 266  */
 267 static int
 268 ldap_back_conndnlc_cmp( const void *c1, const void *c2 )
 269 {
 270         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 271         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 272         int rc;
 273
 274         /* If local DNs don't match, it is definitely not a match */
 275         /* For shared sessions, conn is NULL. Only explicitly
 276          * bound sessions will have non-NULL conn.
 277          */
 278         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 279         if ( rc == 0 ) {
 280                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 281                 if ( rc == 0 ) {
 282                         rc = SLAP_PTRCMP( lc1, lc2 );
 283                 }
 284         }
 285
 286         return rc;
 287 }
 288
 289 /*
 290  * ldap_back_conn_cmp
 291  *
 292  * compares two ldapconn_t based on the value of the conn pointer;
 293  * used by avl stuff for delete of all conns with the same connid
 294  */
 295 int
 296 ldap_back_conn_cmp( const void *c1, const void *c2 )
 297 {
 298         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 299         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 300
 301         /* For shared sessions, conn is NULL. Only explicitly
 302          * bound sessions will have non-NULL conn.
 303          */
 304         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 305 }
 306
 307 /*
 308  * ldap_back_conndn_dup
 309  *
 310  * returns -1 in case a duplicate ldapconn_t has been inserted;
 311  * used by avl stuff
 312  */
 313 int
 314 ldap_back_conndn_dup( void *c1, void *c2 )
 315 {
 316         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 317         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 318
 319         /* Cannot have more than one shared session with same DN */
 320         if ( lc1->lc_conn == lc2->lc_conn &&
 321                 dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) )
 322         {
 323                 return -1;
 324         }
 325
 326         return 0;
 327 }
 328
 329 int
 330 ldap_back_freeconn( Operation *op, ldapconn_t *lc, int dolock )
 331 {
 332         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 333         ldapconn_t      *tmplc;
 334
 335         if ( dolock ) {
 336                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 337         }
 338
 339         tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 340                         ldap_back_conndnlc_cmp );
 341         assert( LDAP_BACK_CONN_TAINTED( lc ) || tmplc == lc );
 342         if ( lc->lc_refcnt == 0 ) {
 343                 ldap_back_conn_free( (void *)lc );
 344         }
 345
 346         if ( dolock ) {
 347                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 348         }
 349
 350         return 0;
 351 }
 352
 353 #ifdef HAVE_TLS
 354 static int
 355 ldap_back_start_tls(
 356         LDAP            *ld,
 357         int             protocol,
 358         int             *is_tls,
 359         const char      *url,
 360         unsigned        flags,
 361         int             retries,
 362         const char      **text )
 363 {
 364         int             rc = LDAP_SUCCESS;
 365         ldapinfo_t      dummy;
 366
 367         /* this is ridiculous... */
 368         dummy.li_flags = flags;
 369
 370         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 371         if ( ( LDAP_BACK_USE_TLS( &dummy ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &dummy ) ) )
 372                                 && !ldap_is_ldaps_url( url ) )
 373         {
 374 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 375                 /*
 376                  * use asynchronous StartTLS
 377                  * in case, chase referral (not implemented yet)
 378                  */
 379                 int             msgid;
 380
 381                 if ( protocol == 0 ) {
 382                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 383                                         (void *)&protocol );
 384                 }
 385
 386                 if ( protocol < LDAP_VERSION3 ) {
 387                         /* we should rather bail out... */
 388                         rc = LDAP_UNWILLING_TO_PERFORM;
 389                         *text = "invalid protocol version";
 390                 }
 391
 392                 if ( rc == LDAP_SUCCESS ) {
 393                         rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 394                 }
 395
 396                 if ( rc == LDAP_SUCCESS ) {
 397                         LDAPMessage     *res = NULL;
 398                         struct timeval  tv;
 399
 400                         LDAP_BACK_TV_SET( &tv );
 401
 402 retry:;
 403                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 404                         if ( rc < 0 ) {
 405                                 rc = LDAP_UNAVAILABLE;
 406
 407                         } else if ( rc == 0 ) {
 408                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 409                                         ldap_pvt_thread_yield();
 410                                         if ( retries > 0 ) {
 411                                                 retries--;
 412                                         }
 413                                         LDAP_BACK_TV_SET( &tv );
 414                                         goto retry;
 415                                 }
 416                                 rc = LDAP_UNAVAILABLE;
 417
 418                         } else if ( rc == LDAP_RES_EXTENDED ) {
 419                                 struct berval   *data = NULL;
 420
 421                                 rc = ldap_parse_extended_result( ld, res,
 422                                                 NULL, &data, 0 );
 423                                 if ( rc == LDAP_SUCCESS ) {
 424                                         int err;
 425                                         rc = ldap_parse_result( ld, res, &err,
 426                                                 NULL, NULL, NULL, NULL, 1 );
 427                                         if ( rc == LDAP_SUCCESS ) {
 428                                                 rc = err;
 429                                         }
 430                                         res = NULL;
 431
 432                                         /* FIXME: in case a referral
 433                                          * is returned, should we try
 434                                          * using it instead of the
 435                                          * configured URI? */
 436                                         if ( rc == LDAP_SUCCESS ) {
 437                                                 rc = ldap_install_tls( ld );
 438
 439                                         } else if ( rc == LDAP_REFERRAL ) {
 440                                                 rc = LDAP_UNWILLING_TO_PERFORM;
 441                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 442                                         }
 443
 444                                         if ( data ) {
 445                                                 if ( data->bv_val ) {
 446                                                         ber_memfree( data->bv_val );
 447                                                 }
 448                                                 ber_memfree( data );
 449                                         }
 450                                 }
 451
 452                         } else {
 453                                 rc = LDAP_OTHER;
 454                         }
 455
 456                         if ( res != NULL ) {
 457                                 ldap_msgfree( res );
 458                         }
 459                 }
 460 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 461                 /*
 462                  * use synchronous StartTLS
 463                  */
 464                 rc = ldap_start_tls_s( ld, NULL, NULL );
 465 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 466
 467                 /* if StartTLS is requested, only attempt it if the URL
 468                  * is not "ldaps://"; this may occur not only in case
 469                  * of misconfiguration, but also when used in the chain
 470                  * overlay, where the "uri" can be parsed out of a referral */
 471                 switch ( rc ) {
 472                 case LDAP_SUCCESS:
 473                         *is_tls = 1;
 474                         break;
 475
 476                 case LDAP_SERVER_DOWN:
 477                         break;
 478
 479                 default:
 480                         if ( LDAP_BACK_TLS_CRITICAL( &dummy ) ) {
 481                                 *text = "could not start TLS";
 482                                 break;
 483                         }
 484
 485                         /* in case Start TLS is not critical */
 486                         *is_tls = 0;
 487                         rc = LDAP_SUCCESS;
 488                         break;
 489                 }
 490
 491         } else {
 492                 *is_tls = 0;
 493         }
 494
 495         return rc;
 496 }
 497 #endif /* HAVE_TLS */
 498
 499 static int
 500 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 501 {
 502         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 503         int             version;
 504         LDAP            *ld = NULL;
 505 #ifdef HAVE_TLS
 506         int             is_tls = op->o_conn->c_is_tls;
 507 #endif /* HAVE_TLS */
 508
 509         assert( lcp != NULL );
 510
 511         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 512         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 513         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 514         if ( rs->sr_err != LDAP_SUCCESS ) {
 515                 goto error_return;
 516         }
 517
 518         if ( li->li_urllist_f ) {
 519                 ldap_set_urllist_proc( ld, li->li_urllist_f, li->li_urllist_p );
 520         }
 521
 522         /* Set LDAP version. This will always succeed: If the client
 523          * bound with a particular version, then so can we.
 524          */
 525         if ( li->li_version != 0 ) {
 526                 version = li->li_version;
 527
 528         } else if ( op->o_protocol != 0 ) {
 529                 version = op->o_protocol;
 530
 531         } else {
 532                 /* assume it's an internal op; set to LDAPv3 */
 533                 version = LDAP_VERSION3;
 534         }
 535         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&version );
 536
 537         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 538         ldap_set_option( ld, LDAP_OPT_REFERRALS,
 539                 LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 540
 541         if ( li->li_network_timeout > 0 ) {
 542                 struct timeval          tv;
 543
 544                 tv.tv_sec = li->li_network_timeout;
 545                 tv.tv_usec = 0;
 546                 ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
 547         }
 548
 549 #ifdef HAVE_TLS
 550         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 551         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 552                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 553         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 554         if ( rs->sr_err != LDAP_SUCCESS ) {
 555                 ldap_unbind_ext( ld, NULL, NULL );
 556                 goto error_return;
 557         }
 558 #endif /* HAVE_TLS */
 559
 560         if ( *lcp == NULL ) {
 561                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 562                 (*lcp)->lc_flags = li->li_flags;
 563         }
 564         (*lcp)->lc_ld = ld;
 565         (*lcp)->lc_refcnt = 1;
 566         (*lcp)->lc_binding = 1;
 567 #ifdef HAVE_TLS
 568         if ( is_tls ) {
 569                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 570         } else {
 571                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 572         }
 573 #endif /* HAVE_TLS */
 574
 575 error_return:;
 576         if ( rs->sr_err != LDAP_SUCCESS ) {
 577                 rs->sr_err = slap_map_api2result( rs );
 578                 if ( sendok & LDAP_BACK_SENDERR ) {
 579                         if ( rs->sr_text == NULL ) {
 580                                 rs->sr_text = "ldap_initialize() failed";
 581                         }
 582                         send_ldap_result( op, rs );
 583                         rs->sr_text = NULL;
 584                 }
 585
 586         } else {
 587                 if ( li->li_conn_ttl > 0 ) {
 588                         (*lcp)->lc_create_time = op->o_time;
 589                 }
 590         }
 591
 592         return rs->sr_err;
 593 }
 594
 595 ldapconn_t *
 596 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 597 {
 598         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 599         ldapconn_t      *lc = NULL,
 600                         lc_curr = { 0 };
 601         int             refcnt = 1, binding = 1;
 602
 603         /* if the server is quarantined, and
 604          * - the current interval did not expire yet, or
 605          * - no more retries should occur,
 606          * don't return the connection */
 607         if ( li->li_isquarantined ) {
 608                 slap_retry_info_t       *ri = &li->li_quarantine;
 609                 int                     dont_retry = 1;
 610
 611                 ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
 612                 if ( li->li_isquarantined == LDAP_BACK_FQ_YES ) {
 613                         dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
 614                                 || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
 615                         if ( !dont_retry ) {
 616                                 Debug( LDAP_DEBUG_ANY,
 617                                         "%s: ldap_back_getconn quarantine "
 618                                         "retry block #%d try #%d.\n",
 619                                         op->o_log_prefix, ri->ri_idx, ri->ri_count );
 620                                 li->li_isquarantined = LDAP_BACK_FQ_RETRYING;
 621                         }
 622                 }
 623                 ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
 624
 625                 if ( dont_retry ) {
 626                         rs->sr_err = LDAP_UNAVAILABLE;
 627                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 628                                 send_ldap_result( op, rs );
 629                         }
 630                         return NULL;
 631                 }
 632         }
 633
 634         /* Internal searches are privileged and shared. So is root. */
 635         if ( op->o_do_not_cache || be_isroot( op ) ) {
 636                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 637                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 638                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 639
 640         } else {
 641                 lc_curr.lc_local_ndn = op->o_ndn;
 642                 /* Explicit binds must not be shared */
 643                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 644                         lc_curr.lc_conn = op->o_conn;
 645
 646                 } else {
 647                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 648                 }
 649         }
 650
 651         /* Explicit Bind requests always get their own conn */
 652         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 653                 /* Searches for a ldapconn in the avl tree */
 654 retry_lock:
 655                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 656
 657                 lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 658                                 (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 659                 if ( lc != NULL ) {
 660                         /* Don't reuse connections while they're still binding */
 661                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 662                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 663                                 ldap_pvt_thread_yield();
 664                                 goto retry_lock;
 665                         }
 666
 667                         refcnt = ++lc->lc_refcnt;
 668                         binding = ++lc->lc_binding;
 669                 }
 670                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 671         }
 672
 673         /* Looks like we didn't get a bind. Open a new session... */
 674         if ( lc == NULL ) {
 675                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 676                         return NULL;
 677                 }
 678                 if ( sendok & LDAP_BACK_BINDING ) {
 679                         LDAP_BACK_CONN_BINDING_SET( lc );
 680                 }
 681                 lc->lc_conn = lc_curr.lc_conn;
 682                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 683
 684                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 685                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 686                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 687                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 688
 689                 } else {
 690                         BER_BVZERO( &lc->lc_cred );
 691                         BER_BVZERO( &lc->lc_bound_ndn );
 692                         if ( !BER_BVISEMPTY( &op->o_ndn )
 693                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 694                         {
 695                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 696                         }
 697                 }
 698
 699 #ifdef HAVE_TLS
 700                 /* if start TLS failed but it was not mandatory,
 701                  * check if the non-TLS connection was already
 702                  * in cache; in case, destroy the newly created
 703                  * connection and use the existing one */
 704                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 705                                 && !ldap_tls_inplace( lc->lc_ld ) )
 706                 {
 707                         ldapconn_t *tmplc;
 708
 709                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 710                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 711                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 712                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 713                         if ( tmplc != NULL ) {
 714                                 refcnt = ++tmplc->lc_refcnt;
 715                                 binding = ++tmplc->lc_binding;
 716                                 ldap_back_conn_free( lc );
 717                                 lc = tmplc;
 718                         }
 719                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 720
 721                         if ( tmplc != NULL ) {
 722                                 goto done;
 723                         }
 724                 }
 725 #endif /* HAVE_TLS */
 726
 727                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 728
 729                 /* Inserts the newly created ldapconn in the avl tree */
 730                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 731
 732                 assert( lc->lc_refcnt == 1 );
 733                 assert( lc->lc_binding == 1 );
 734                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 735                         ldap_back_conndn_cmp, ldap_back_conndn_dup );
 736
 737 #if PRINT_CONNTREE > 0
 738                 myprint( li->li_conninfo.lai_tree, "ldap_back_getconn" );
 739 #endif /* PRINT_CONNTREE */
 740
 741                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 742
 743                 Debug( LDAP_DEBUG_TRACE,
 744                         "=>ldap_back_getconn: conn %p inserted refcnt=%u binding=%u\n",
 745                         (void *)lc, refcnt, binding );
 746
 747                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 748                 switch ( rs->sr_err ) {
 749                 case 0:
 750                         break;
 751
 752                 case -1:
 753                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 754                                 /* duplicate: free and try to get the newly created one */
 755                                 goto retry_lock;
 756                         }
 757                         /* taint connection, so that it'll be freed when released */
 758                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 759                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 760                                         ldap_back_conndnlc_cmp );
 761                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 762                         LDAP_BACK_CONN_TAINTED_SET( lc );
 763                         break;
 764
 765                 default:
 766                         ldap_back_conn_free( lc );
 767                         rs->sr_err = LDAP_OTHER;
 768                         rs->sr_text = "proxy bind collision";
 769                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 770                                 send_ldap_result( op, rs );
 771                                 rs->sr_text = NULL;
 772                         }
 773                         return NULL;
 774                 }
 775
 776         } else {
 777                 int     expiring = 0;
 778
 779                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
 780                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
 781                 {
 782                         expiring = 1;
 783
 784                         /* let it be used, but taint/delete it so that
 785                          * no-one else can look it up any further */
 786                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 787                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 788                                         ldap_back_conndnlc_cmp );
 789                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 790                         LDAP_BACK_CONN_TAINTED_SET( lc );
 791                 }
 792
 793                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 794                         char    buf[ SLAP_TEXT_BUFLEN ];
 795
 796                         snprintf( buf, sizeof( buf ),
 797                                 "conn %p fetched refcnt=%u binding=%u%s",
 798                                 (void *)lc, refcnt, binding, expiring ? " expiring" : "" );
 799                         Debug( LDAP_DEBUG_TRACE,
 800                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
 801                 }
 802         }
 803
 804 #ifdef HAVE_TLS
 805 done:;
 806 #endif /* HAVE_TLS */
 807         if ( li->li_idle_timeout && lc ) {
 808                 lc->lc_time = op->o_time;
 809         }
 810
 811         return lc;
 812 }
 813
 814 void
 815 ldap_back_release_conn_lock(
 816         Operation               *op,
 817         SlapReply               *rs,
 818         ldapconn_t              *lc,
 819         int                     dolock )
 820 {
 821         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 822
 823         if ( dolock ) {
 824                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 825         }
 826         assert( lc->lc_refcnt > 0 );
 827         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 828         lc->lc_refcnt--;
 829         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
 830                 ldap_back_freeconn( op, lc, 0 );
 831         }
 832         if ( dolock ) {
 833                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 834         }
 835 }
 836
 837 void
 838 ldap_back_quarantine(
 839         Operation       *op,
 840         SlapReply       *rs )
 841 {
 842         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 843
 844         slap_retry_info_t       *ri = &li->li_quarantine;
 845
 846         ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
 847
 848         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
 849                 switch ( li->li_isquarantined ) {
 850                 case LDAP_BACK_FQ_NO:
 851                         Debug( LDAP_DEBUG_ANY,
 852                                 "%s: ldap_back_quarantine enter.\n",
 853                                 op->o_log_prefix, 0, 0 );
 854
 855                         ri->ri_idx = 0;
 856                         ri->ri_count = 0;
 857                         break;
 858
 859                 case LDAP_BACK_FQ_RETRYING:
 860                         Debug( LDAP_DEBUG_ANY,
 861                                 "%s: ldap_back_quarantine block #%d try #%d failed.\n",
 862                                 op->o_log_prefix, ri->ri_idx, ri->ri_count );
 863
 864                         ++ri->ri_count;
 865                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
 866                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
 867                         {
 868                                 ri->ri_count = 0;
 869                                 ++ri->ri_idx;
 870                         }
 871                         break;
 872
 873                 default:
 874                         break;
 875                 }
 876
 877                 li->li_isquarantined = LDAP_BACK_FQ_YES;
 878                 ri->ri_last = slap_get_time();
 879
 880         } else if ( li->li_isquarantined != LDAP_BACK_FQ_NO ) {
 881                 Debug( LDAP_DEBUG_ANY,
 882                         "%s: ldap_back_quarantine exit.\n",
 883                         op->o_log_prefix, ri->ri_idx, ri->ri_count );
 884
 885                 if ( li->li_quarantine_f ) {
 886                         (void)li->li_quarantine_f( li, li->li_quarantine_p );
 887                 }
 888
 889                 ri->ri_count = 0;
 890                 ri->ri_idx = 0;
 891                 li->li_isquarantined = LDAP_BACK_FQ_NO;
 892         }
 893
 894         ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
 895 }
 896
 897 /*
 898  * ldap_back_dobind
 899  *
 900  * Note: as the check for the value of lc->lc_bound was already here, I removed
 901  * it from all the callers, and I made the function return the flag, so
 902  * it can be used to simplify the check.
 903  *
 904  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 905  */
 906 static int
 907 ldap_back_dobind_int(
 908         ldapconn_t              *lc,
 909         Operation               *op,
 910         SlapReply               *rs,
 911         ldap_back_send_t        sendok,
 912         int                     retries,
 913         int                     dolock )
 914 {
 915         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 916
 917         int             rc, binding = 0;
 918         ber_int_t       msgid;
 919
 920         assert( retries >= 0 );
 921
 922 retry_lock:;
 923         if ( dolock ) {
 924                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 925         }
 926
 927         if ( binding == 0 ) {
 928                 /* check if already bound */
 929                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 930                 if ( rc ) {
 931                         lc->lc_binding--;
 932                         if ( dolock ) {
 933                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 934                         }
 935                         return rc;
 936                 }
 937
 938                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 939                         /* if someone else is about to bind it, give up and retry */
 940                         if ( dolock ) {
 941                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 942                         }
 943                         ldap_pvt_thread_yield();
 944                         goto retry_lock;
 945
 946                 } else {
 947                         /* otherwise this thread will bind it */
 948                         LDAP_BACK_CONN_BINDING_SET( lc );
 949                         binding = 1;
 950                 }
 951         }
 952
 953         /* wait for pending operations to finish */
 954         /* FIXME: may become a bottleneck! */
 955         if ( lc->lc_refcnt != lc->lc_binding ) {
 956                 if ( dolock ) {
 957                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 958                 }
 959                 ldap_pvt_thread_yield();
 960                 goto retry_lock;
 961         }
 962
 963         if ( dolock ) {
 964                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 965         }
 966
 967 #if 0
 968         while ( lc->lc_refcnt > 1 ) {
 969                 ldap_pvt_thread_yield();
 970                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 971                 if ( rc ) {
 972                         return rc;
 973                 }
 974         }
 975
 976         if ( dolock ) {
 977                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 978         }
 979         LDAP_BACK_CONN_BINDING_SET( lc );
 980         if ( dolock ) {
 981                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 982         }
 983 #endif
 984
 985         /*
 986          * FIXME: we need to let clients use proxyAuthz
 987          * otherwise we cannot do symmetric pools of servers;
 988          * we have to live with the fact that a user can
 989          * authorize itself as any ID that is allowed
 990          * by the authzTo directive of the "proxyauthzdn".
 991          */
 992         /*
 993          * NOTE: current Proxy Authorization specification
 994          * and implementation do not allow proxy authorization
 995          * control to be provided with Bind requests
 996          */
 997         /*
 998          * if no bind took place yet, but the connection is bound
 999          * and the "idassert-authcDN" (or other ID) is set,
1000          * then bind as the asserting identity and explicitly
1001          * add the proxyAuthz control to every operation with the
1002          * dn bound to the connection as control value.
1003          * This is done also if this is the authrizing backend,
1004          * but the "override" flag is given to idassert.
1005          * It allows to use SASL bind and yet proxyAuthz users
1006          */
1007         if ( op->o_conn != NULL &&
1008                 !op->o_do_not_cache &&
1009                 ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
1010                         ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
1011         {
1012                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok );
1013                 goto done;
1014         }
1015
1016 #ifdef HAVE_CYRUS_SASL
1017         if ( LDAP_BACK_CONN_ISPRIV( lc )
1018                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
1019         {
1020                 void            *defaults = NULL;
1021
1022                 if ( li->li_acl_secprops != NULL ) {
1023                         rc = ldap_set_option( lc->lc_ld,
1024                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops );
1025
1026                         if ( rc != LDAP_OPT_SUCCESS ) {
1027                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
1028                                         "(SECPROPS,\"%s\") failed!\n",
1029                                         li->li_acl_secprops, 0, 0 );
1030                                 goto done;
1031                         }
1032                 }
1033
1034                 defaults = lutil_sasl_defaults( lc->lc_ld,
1035                                 li->li_acl_sasl_mech.bv_val,
1036                                 li->li_acl_sasl_realm.bv_val,
1037                                 li->li_acl_authcID.bv_val,
1038                                 li->li_acl_passwd.bv_val,
1039                                 NULL );
1040
1041                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
1042                                 li->li_acl_authcDN.bv_val,
1043                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
1044                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1045                                 defaults );
1046
1047                 lutil_sasl_freedefs( defaults );
1048
1049                 rs->sr_err = slap_map_api2result( rs );
1050                 if ( rs->sr_err != LDAP_SUCCESS ) {
1051                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1052                         send_ldap_result( op, rs );
1053
1054                 } else {
1055                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1056                 }
1057
1058                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1059                         ldap_back_quarantine( op, rs );
1060                 }
1061
1062                 goto done;
1063         }
1064 #endif /* HAVE_CYRUS_SASL */
1065
1066 retry:;
1067         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1068                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1069                         LDAP_SASL_SIMPLE, &lc->lc_cred,
1070                         NULL, NULL, &msgid );
1071
1072         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
1073                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
1074                         if ( dolock ) {
1075                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1076                         }
1077
1078                         assert( lc->lc_refcnt > 0 );
1079                         if ( lc->lc_refcnt == 1 ) {
1080                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
1081                                 lc->lc_ld = NULL;
1082
1083                                 /* lc here must be the regular lc, reset and ready for init */
1084                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
1085                                 if ( rs->sr_err != LDAP_SUCCESS ) {
1086                                         lc->lc_binding--;
1087                                         lc->lc_refcnt = 0;
1088                                 }
1089                         }
1090
1091                         if ( dolock ) {
1092                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1093                         }
1094
1095                         if ( rs->sr_err == LDAP_SUCCESS ) {
1096                                 if ( retries > 0 ) {
1097                                         retries--;
1098                                 }
1099                                 goto retry;
1100                         }
1101
1102                 } else {
1103                         if ( dolock ) {
1104                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1105                         }
1106                         lc->lc_binding--;
1107                         if ( dolock ) {
1108                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1109                         }
1110                 }
1111
1112                 /* FIXME: one binding-- too many? */
1113                 lc->lc_binding--;
1114                 ldap_back_freeconn( op, lc, dolock );
1115                 rs->sr_err = slap_map_api2result( rs );
1116
1117                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1118                         ldap_back_quarantine( op, rs );
1119                 }
1120
1121                 return 0;
1122         }
1123
1124         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1125         if ( rc == LDAP_SUCCESS ) {
1126                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1127         }
1128
1129 done:;
1130         lc->lc_binding--;
1131         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1132         rc = LDAP_BACK_CONN_ISBOUND( lc );
1133         if ( !rc ) {
1134                 ldap_back_release_conn_lock( op, rs, lc, dolock );
1135         }
1136
1137         return rc;
1138 }
1139
1140 int
1141 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1142 {
1143         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1144
1145         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
1146 }
1147
1148 /*
1149  * ldap_back_default_rebind
1150  *
1151  * This is a callback used for chasing referrals using the same
1152  * credentials as the original user on this session.
1153  */
1154 int
1155 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1156         ber_int_t msgid, void *params )
1157 {
1158         ldapconn_t      *lc = (ldapconn_t *)params;
1159
1160 #ifdef HAVE_TLS
1161         /* ... otherwise we couldn't get here */
1162         assert( lc != NULL );
1163
1164         if ( !ldap_tls_inplace( ld ) ) {
1165                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1166                                 rc;
1167                 const char      *text = NULL;
1168
1169                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1170                         LDAP_BACK_RETRY_DEFAULT, &text );
1171                 if ( rc != LDAP_SUCCESS ) {
1172                         return rc;
1173                 }
1174         }
1175 #endif /* HAVE_TLS */
1176
1177         /* FIXME: add checks on the URL/identity? */
1178
1179         return ldap_sasl_bind_s( ld,
1180                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1181                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1182 }
1183
1184 /*
1185  * ldap_back_default_urllist
1186  */
1187 int
1188 ldap_back_default_urllist(
1189         LDAP            *ld,
1190         LDAPURLDesc     **urllist,
1191         LDAPURLDesc     **url,
1192         void            *params )
1193 {
1194         ldapinfo_t      *li = (ldapinfo_t *)params;
1195         LDAPURLDesc     **urltail;
1196
1197         if ( urllist == url ) {
1198                 return LDAP_SUCCESS;
1199         }
1200
1201         for ( urltail = &(*url)->lud_next; *urltail; urltail = &(*urltail)->lud_next )
1202                 /* count */ ;
1203
1204         *urltail = *urllist;
1205         *urllist = *url;
1206         *url = NULL;
1207
1208         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1209         if ( li->li_uri ) {
1210                 ch_free( li->li_uri );
1211         }
1212
1213         ldap_get_option( ld, LDAP_OPT_URI, (void *)&li->li_uri );
1214         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1215
1216         return LDAP_SUCCESS;
1217 }
1218
1219 int
1220 ldap_back_cancel(
1221                 ldapconn_t              *lc,
1222                 Operation               *op,
1223                 SlapReply               *rs,
1224                 ber_int_t               msgid,
1225                 ldap_back_send_t        sendok )
1226 {
1227         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1228
1229         /* default behavior */
1230         if ( LDAP_BACK_ABANDON( li ) ) {
1231                 return ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1232         }
1233
1234         if ( LDAP_BACK_IGNORE( li ) ) {
1235                 return LDAP_SUCCESS;
1236         }
1237
1238         if ( LDAP_BACK_CANCEL( li ) ) {
1239                 /* FIXME: asynchronous? */
1240                 return ldap_cancel_s( lc->lc_ld, msgid, NULL, NULL );
1241         }
1242
1243         assert( 0 );
1244
1245         return LDAP_OTHER;
1246 }
1247
1248 int
1249 ldap_back_op_result(
1250                 ldapconn_t              *lc,
1251                 Operation               *op,
1252                 SlapReply               *rs,
1253                 ber_int_t               msgid,
1254                 time_t                  timeout,
1255                 ldap_back_send_t        sendok )
1256 {
1257         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1258
1259         char            *match = NULL;
1260         LDAPMessage     *res = NULL;
1261         char            *text = NULL;
1262         char            **refs = NULL;
1263         LDAPControl     **ctrls = NULL;
1264
1265 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1266
1267         rs->sr_text = NULL;
1268         rs->sr_matched = NULL;
1269         rs->sr_ref = NULL;
1270         rs->sr_ctrls = NULL;
1271
1272         /* if the error recorded in the reply corresponds
1273          * to a successful state, get the error from the
1274          * remote server response */
1275         if ( ERR_OK( rs->sr_err ) ) {
1276                 int             rc;
1277                 struct timeval  tv;
1278
1279                 if ( timeout ) {
1280                         tv.tv_sec = timeout;
1281                         tv.tv_usec = 0;
1282
1283                 } else {
1284                         LDAP_BACK_TV_SET( &tv );
1285                 }
1286
1287 retry:;
1288                 /* if result parsing fails, note the failure reason */
1289                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1290                 switch ( rc ) {
1291                 case 0:
1292                         if ( timeout ) {
1293                                 (void)ldap_back_cancel( lc, op, rs, msgid, sendok );
1294                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
1295                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
1296                                 rs->sr_text = "Operation timed out";
1297                                 break;
1298                         }
1299
1300                         LDAP_BACK_TV_SET( &tv );
1301                         ldap_pvt_thread_yield();
1302                         goto retry;
1303
1304                 case -1:
1305                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1306                                         &rs->sr_err );
1307                         break;
1308
1309
1310                 /* otherwise get the result; if it is not
1311                  * LDAP_SUCCESS, record it in the reply
1312                  * structure (this includes
1313                  * LDAP_COMPARE_{TRUE|FALSE}) */
1314                 default:
1315                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1316                                         &match, &text, &refs, &ctrls, 1 );
1317                         rs->sr_text = text;
1318                         if ( rc != LDAP_SUCCESS ) {
1319                                 rs->sr_err = rc;
1320                         }
1321                         if ( refs != NULL ) {
1322                                 int     i;
1323
1324                                 for ( i = 0; refs[ i ] != NULL; i++ )
1325                                         /* count */ ;
1326                                 rs->sr_ref = op->o_tmpalloc( sizeof( struct berval ) * ( i + 1 ),
1327                                         op->o_tmpmemctx );
1328                                 for ( i = 0; refs[ i ] != NULL; i++ ) {
1329                                         ber_str2bv( refs[ i ], 0, 0, &rs->sr_ref[ i ] );
1330                                 }
1331                                 BER_BVZERO( &rs->sr_ref[ i ] );
1332                         }
1333                         if ( ctrls != NULL ) {
1334                                 rs->sr_ctrls = ctrls;
1335                         }
1336                 }
1337         }
1338
1339         /* if the error in the reply structure is not
1340          * LDAP_SUCCESS, try to map it from client
1341          * to server error */
1342         if ( !ERR_OK( rs->sr_err ) ) {
1343                 rs->sr_err = slap_map_api2result( rs );
1344
1345                 /* internal ops ( op->o_conn == NULL )
1346                  * must not reply to client */
1347                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1348
1349                         /* record the (massaged) matched
1350                          * DN into the reply structure */
1351                         rs->sr_matched = match;
1352                 }
1353         }
1354         if ( LDAP_BACK_QUARANTINE( li ) ) {
1355                 ldap_back_quarantine( op, rs );
1356         }
1357         if ( op->o_conn &&
1358                 ( ( sendok & LDAP_BACK_SENDOK )
1359                         || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1360         {
1361                 send_ldap_result( op, rs );
1362         }
1363         if ( match ) {
1364                 if ( rs->sr_matched != match ) {
1365                         free( (char *)rs->sr_matched );
1366                 }
1367                 rs->sr_matched = NULL;
1368                 ldap_memfree( match );
1369         }
1370         if ( text ) {
1371                 ldap_memfree( text );
1372         }
1373         rs->sr_text = NULL;
1374         if ( rs->sr_ref ) {
1375                 assert( refs != NULL );
1376                 ber_memvfree( (void **)refs );
1377                 op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
1378                 rs->sr_ref = NULL;
1379         }
1380         if ( ctrls ) {
1381                 assert( rs->sr_ctrls != NULL );
1382                 ldap_controls_free( ctrls );
1383                 rs->sr_ctrls = NULL;
1384         }
1385         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1386 }
1387
1388 /* return true if bound, false if failed */
1389 int
1390 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1391 {
1392         int             rc = 0;
1393         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1394
1395         assert( lcp != NULL );
1396         assert( *lcp != NULL );
1397
1398         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1399
1400         if ( (*lcp)->lc_refcnt == 1 ) {
1401                 ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1402                 Debug( LDAP_DEBUG_ANY,
1403                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1404                         op->o_log_prefix, li->li_uri,
1405                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1406                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1407                 ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1408
1409                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1410                 (*lcp)->lc_ld = NULL;
1411                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1412
1413                 /* lc here must be the regular lc, reset and ready for init */
1414                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1415                 if ( rc != LDAP_SUCCESS ) {
1416                         rc = 0;
1417                         /* freeit, because lc_refcnt == 1 */
1418                         (void)ldap_back_conn_free( *lcp );
1419                         *lcp = NULL;
1420
1421                 } else {
1422                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1423                         if ( rc == 0 && *lcp != NULL ) {
1424                                 /* freeit, because lc_refcnt == 1 */
1425                                 (void)ldap_back_conn_free( *lcp );
1426                                 *lcp = NULL;
1427                         }
1428                 }
1429
1430         } else {
1431                 Debug( LDAP_DEBUG_TRACE,
1432                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1433                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1434
1435                 LDAP_BACK_CONN_TAINTED_SET( *lcp );
1436                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1437                 *lcp = NULL;
1438
1439                 if ( sendok ) {
1440                         rs->sr_err = LDAP_UNAVAILABLE;
1441                         rs->sr_text = "unable to retry";
1442                         send_ldap_result( op, rs );
1443                 }
1444         }
1445
1446         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1447
1448         return rc;
1449 }
1450
1451 static int
1452 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1453 {
1454         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1455         struct berval   binddn = slap_empty_bv;
1456         struct berval   bindcred = slap_empty_bv;
1457         struct berval   ndn;
1458         int             dobind = 0;
1459         int             msgid;
1460         int             rc;
1461
1462         /* don't proxyAuthz if protocol is not LDAPv3 */
1463         switch ( li->li_version ) {
1464         case LDAP_VERSION3:
1465                 break;
1466
1467         case 0:
1468                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1469                         break;
1470                 }
1471                 /* fall thru */
1472
1473         default:
1474                 goto done;
1475         }
1476
1477         if ( op->o_tag == LDAP_REQ_BIND ) {
1478                 ndn = op->o_req_ndn;
1479
1480         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1481                 ndn = op->o_conn->c_ndn;
1482
1483         } else {
1484                 ndn = op->o_ndn;
1485         }
1486
1487         /*
1488          * FIXME: we need to let clients use proxyAuthz
1489          * otherwise we cannot do symmetric pools of servers;
1490          * we have to live with the fact that a user can
1491          * authorize itself as any ID that is allowed
1492          * by the authzTo directive of the "proxyauthzdn".
1493          */
1494         /*
1495          * NOTE: current Proxy Authorization specification
1496          * and implementation do not allow proxy authorization
1497          * control to be provided with Bind requests
1498          */
1499         /*
1500          * if no bind took place yet, but the connection is bound
1501          * and the "proxyauthzdn" is set, then bind as
1502          * "proxyauthzdn" and explicitly add the proxyAuthz
1503          * control to every operation with the dn bound
1504          * to the connection as control value.
1505          */
1506
1507         /* bind as proxyauthzdn only if no idassert mode
1508          * is requested, or if the client's identity
1509          * is authorized */
1510         switch ( li->li_idassert_mode ) {
1511         case LDAP_BACK_IDASSERT_LEGACY:
1512                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1513                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1514                         {
1515                                 binddn = li->li_idassert_authcDN;
1516                                 bindcred = li->li_idassert_passwd;
1517                                 dobind = 1;
1518                         }
1519                 }
1520                 break;
1521
1522         default:
1523                 /* NOTE: rootdn can always idassert */
1524                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1525                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1526                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1527                                 if ( sendok & LDAP_BACK_SENDERR ) {
1528                                         send_ldap_result( op, rs );
1529                                 }
1530                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1531
1532                         } else {
1533                                 rs->sr_err = LDAP_SUCCESS;
1534                                 binddn = slap_empty_bv;
1535                                 bindcred = slap_empty_bv;
1536                                 break;
1537                         }
1538
1539                         goto done;
1540
1541                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1542                         struct berval authcDN;
1543
1544                         if ( BER_BVISNULL( &ndn ) ) {
1545                                 authcDN = slap_empty_bv;
1546
1547                         } else {
1548                                 authcDN = ndn;
1549                         }
1550                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1551                                         &authcDN, &authcDN );
1552                         if ( rs->sr_err != LDAP_SUCCESS ) {
1553                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1554                                         if ( sendok & LDAP_BACK_SENDERR ) {
1555                                                 send_ldap_result( op, rs );
1556                                         }
1557                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1558
1559                                 } else {
1560                                         rs->sr_err = LDAP_SUCCESS;
1561                                         binddn = slap_empty_bv;
1562                                         bindcred = slap_empty_bv;
1563                                         break;
1564                                 }
1565
1566                                 goto done;
1567                         }
1568                 }
1569
1570                 binddn = li->li_idassert_authcDN;
1571                 bindcred = li->li_idassert_passwd;
1572                 dobind = 1;
1573                 break;
1574         }
1575
1576         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1577 #ifdef HAVE_CYRUS_SASL
1578                 void            *defaults = NULL;
1579                 struct berval   authzID = BER_BVNULL;
1580                 int             freeauthz = 0;
1581
1582                 /* if SASL supports native authz, prepare for it */
1583                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1584                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1585                 {
1586                         switch ( li->li_idassert_mode ) {
1587                         case LDAP_BACK_IDASSERT_OTHERID:
1588                         case LDAP_BACK_IDASSERT_OTHERDN:
1589                                 authzID = li->li_idassert_authzID;
1590                                 break;
1591
1592                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1593                                 BER_BVSTR( &authzID, "dn:" );
1594                                 break;
1595
1596                         case LDAP_BACK_IDASSERT_SELF:
1597                                 if ( BER_BVISNULL( &ndn ) ) {
1598                                         /* connection is not authc'd, so don't idassert */
1599                                         BER_BVSTR( &authzID, "dn:" );
1600                                         break;
1601                                 }
1602                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1603                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1604                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1605                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1606                                                 ndn.bv_val, ndn.bv_len + 1 );
1607                                 freeauthz = 1;
1608                                 break;
1609
1610                         default:
1611                                 break;
1612                         }
1613                 }
1614
1615                 if ( li->li_idassert_secprops != NULL ) {
1616                         rs->sr_err = ldap_set_option( lc->lc_ld,
1617                                 LDAP_OPT_X_SASL_SECPROPS,
1618                                 (void *)li->li_idassert_secprops );
1619
1620                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1621                                 rs->sr_err = LDAP_OTHER;
1622                                 if ( sendok & LDAP_BACK_SENDERR ) {
1623                                         send_ldap_result( op, rs );
1624                                 }
1625                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1626                                 goto done;
1627                         }
1628                 }
1629
1630                 defaults = lutil_sasl_defaults( lc->lc_ld,
1631                                 li->li_idassert_sasl_mech.bv_val,
1632                                 li->li_idassert_sasl_realm.bv_val,
1633                                 li->li_idassert_authcID.bv_val,
1634                                 li->li_idassert_passwd.bv_val,
1635                                 authzID.bv_val );
1636
1637                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1638                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1639                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1640                                 defaults );
1641
1642                 rs->sr_err = slap_map_api2result( rs );
1643                 if ( rs->sr_err != LDAP_SUCCESS ) {
1644                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1645                         if ( sendok & LDAP_BACK_SENDERR ) {
1646                                 send_ldap_result( op, rs );
1647                         }
1648
1649                 } else {
1650                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1651                 }
1652
1653                 lutil_sasl_freedefs( defaults );
1654                 if ( freeauthz ) {
1655                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1656                 }
1657
1658                 goto done;
1659 #endif /* HAVE_CYRUS_SASL */
1660         }
1661
1662         switch ( li->li_idassert_authmethod ) {
1663         case LDAP_AUTH_NONE:
1664                 BER_BVSTR( &binddn, "" );
1665                 BER_BVSTR( &bindcred, "" );
1666                 /* fallthru */
1667
1668         case LDAP_AUTH_SIMPLE:
1669                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1670                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1671                                 &bindcred, NULL, NULL, &msgid );
1672                 rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1673                 break;
1674
1675         default:
1676                 /* unsupported! */
1677                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1678                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1679                 if ( sendok & LDAP_BACK_SENDERR ) {
1680                         send_ldap_result( op, rs );
1681                 }
1682                 goto done;
1683         }
1684
1685         if ( rc == LDAP_SUCCESS ) {
1686                 /* set rebind stuff in case of successful proxyAuthz bind,
1687                  * so that referral chasing is attempted using the right
1688                  * identity */
1689                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1690                 ber_dupbv( &lc->lc_bound_ndn, &binddn );
1691
1692                 if ( LDAP_BACK_SAVECRED( li ) ) {
1693                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
1694                                 memset( lc->lc_cred.bv_val, 0,
1695                                                 lc->lc_cred.bv_len );
1696                         }
1697                         ber_bvreplace( &lc->lc_cred, &bindcred );
1698                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
1699                 }
1700         }
1701 done:;
1702         return LDAP_BACK_CONN_ISBOUND( lc );
1703 }
1704
1705 /*
1706  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1707  * to existing server-side controls if required; if not,
1708  * the existing server-side controls are placed in *pctrls.
1709  * The caller, after using the controls in client API
1710  * operations, if ( *pctrls != op->o_ctrls ), should
1711  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1712  * The function returns success if the control could
1713  * be added if required, or if it did nothing; in the future,
1714  * it might return some error if it failed.
1715  *
1716  * if no bind took place yet, but the connection is bound
1717  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1718  * and explicitly add proxyAuthz the control to every operation
1719  * with the dn bound to the connection as control value.
1720  *
1721  * If no server-side controls are defined for the operation,
1722  * simply add the proxyAuthz control; otherwise, if the
1723  * proxyAuthz control is not already set, add it as
1724  * the first one
1725  *
1726  * FIXME: is controls order significant for security?
1727  * ANSWER: controls ordering and interoperability
1728  * must be indicated by the specs of each control; if none
1729  * is specified, the order is irrelevant.
1730  */
1731 int
1732 ldap_back_proxy_authz_ctrl(
1733                 ldapconn_t      *lc,
1734                 Operation       *op,
1735                 SlapReply       *rs,
1736                 LDAPControl     ***pctrls )
1737 {
1738         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1739         LDAPControl     **ctrls = NULL;
1740         int             i = 0,
1741                         mode;
1742         struct berval   assertedID,
1743                         ndn;
1744
1745         *pctrls = NULL;
1746
1747         rs->sr_err = LDAP_SUCCESS;
1748
1749         /* don't proxyAuthz if protocol is not LDAPv3 */
1750         switch ( li->li_version ) {
1751         case LDAP_VERSION3:
1752                 break;
1753
1754         case 0:
1755                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1756                         break;
1757                 }
1758                 /* fall thru */
1759
1760         default:
1761                 goto done;
1762         }
1763
1764         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1765          * but if it is not set this test fails.  We need a different
1766          * means to detect if idassert is enabled */
1767         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1768                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1769         {
1770                 goto done;
1771         }
1772
1773         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1774                 goto done;
1775         }
1776
1777         if ( op->o_tag == LDAP_REQ_BIND ) {
1778                 ndn = op->o_req_ndn;
1779
1780         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1781                 ndn = op->o_conn->c_ndn;
1782
1783         } else {
1784                 ndn = op->o_ndn;
1785         }
1786
1787         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1788                 if ( op->o_proxy_authz ) {
1789                         /*
1790                          * FIXME: we do not want to perform proxyAuthz
1791                          * on behalf of the client, because this would
1792                          * be performed with "proxyauthzdn" privileges.
1793                          *
1794                          * This might actually be too strict, since
1795                          * the "proxyauthzdn" authzTo, and each entry's
1796                          * authzFrom attributes may be crafted
1797                          * to avoid unwanted proxyAuthz to take place.
1798                          */
1799 #if 0
1800                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1801                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1802 #endif
1803                         goto done;
1804                 }
1805
1806                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1807                         goto done;
1808                 }
1809
1810                 if ( BER_BVISNULL( &ndn ) ) {
1811                         goto done;
1812                 }
1813
1814                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1815                         goto done;
1816                 }
1817
1818         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1819                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1820                                 /* && ( !BER_BVISNULL( &ndn )
1821                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1822                 {
1823                         /* already asserted in SASL via native authz */
1824                         /* NOTE: the test on lc->lc_bound is used to trap
1825                          * native authorization of anonymous users,
1826                          * since in that case ndn is NULL */
1827                         goto done;
1828                 }
1829
1830         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1831                 int             rc;
1832                 struct berval authcDN;
1833
1834                 if ( BER_BVISNULL( &ndn ) ) {
1835                         authcDN = slap_empty_bv;
1836                 } else {
1837                         authcDN = ndn;
1838                 }
1839                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1840                                 &authcDN, & authcDN );
1841                 if ( rc != LDAP_SUCCESS ) {
1842                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1843                         {
1844                                 /* ndn is not authorized
1845                                  * to use idassert */
1846                                 rs->sr_err = rc;
1847                         }
1848                         goto done;
1849                 }
1850         }
1851
1852         if ( op->o_proxy_authz ) {
1853                 /*
1854                  * FIXME: we can:
1855                  * 1) ignore the already set proxyAuthz control
1856                  * 2) leave it in place, and don't set ours
1857                  * 3) add both
1858                  * 4) reject the operation
1859                  *
1860                  * option (4) is very drastic
1861                  * option (3) will make the remote server reject
1862                  * the operation, thus being equivalent to (4)
1863                  * option (2) will likely break the idassert
1864                  * assumptions, so we cannot accept it;
1865                  * option (1) means that we are contradicting
1866                  * the client's reques.
1867                  *
1868                  * I think (4) is the only correct choice.
1869                  */
1870                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1871                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1872         }
1873
1874         if ( op->o_is_auth_check ) {
1875                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1876
1877         } else {
1878                 mode = li->li_idassert_mode;
1879         }
1880
1881         switch ( mode ) {
1882         case LDAP_BACK_IDASSERT_SELF:
1883                 if ( BER_BVISNULL( &ndn ) ) {
1884                         goto done;
1885                 }
1886                 assertedID = ndn;
1887                 break;
1888
1889         case LDAP_BACK_IDASSERT_LEGACY:
1890                 /* original behavior:
1891                  * assert the client's identity */
1892                 if ( BER_BVISNULL( &ndn ) ) {
1893                         assertedID = slap_empty_bv;
1894                 } else {
1895                         assertedID = ndn;
1896                 }
1897                 break;
1898
1899         case LDAP_BACK_IDASSERT_ANONYMOUS:
1900                 /* assert "anonymous" */
1901                 assertedID = slap_empty_bv;
1902                 break;
1903
1904         case LDAP_BACK_IDASSERT_NOASSERT:
1905                 /* don't assert; bind as proxyauthzdn */
1906                 goto done;
1907
1908         case LDAP_BACK_IDASSERT_OTHERID:
1909         case LDAP_BACK_IDASSERT_OTHERDN:
1910                 /* assert idassert DN */
1911                 assertedID = li->li_idassert_authzID;
1912                 break;
1913
1914         default:
1915                 assert( 0 );
1916         }
1917
1918         if ( BER_BVISNULL( &assertedID ) ) {
1919                 assertedID = slap_empty_bv;
1920         }
1921
1922         /* don't idassert the bound DN (ITS#4497) */
1923         if ( dn_match( &assertedID, &lc->lc_bound_ndn ) ) {
1924                 goto done;
1925         }
1926
1927         if ( op->o_ctrls ) {
1928                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1929                         /* just count ctrls */ ;
1930         }
1931
1932         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1933                         op->o_tmpmemctx );
1934         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1935
1936         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1937         ctrls[ 0 ]->ldctl_iscritical = 1;
1938
1939         switch ( li->li_idassert_mode ) {
1940         /* already in u:ID or dn:DN form */
1941         case LDAP_BACK_IDASSERT_OTHERID:
1942         case LDAP_BACK_IDASSERT_OTHERDN:
1943                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1944                 break;
1945
1946         /* needs the dn: prefix */
1947         default:
1948                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1949                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1950                                 op->o_tmpmemctx );
1951                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1952                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1953                                 assertedID.bv_val, assertedID.bv_len + 1 );
1954                 break;
1955         }
1956
1957         /* Older versions of <draft-weltman-ldapv3-proxy> required
1958          * to encode the value of the authzID (and called it proxyDN);
1959          * this hack provides compatibility with those DSAs that
1960          * implement it this way */
1961         if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
1962                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
1963                 BerElementBuffer        berbuf;
1964                 BerElement              *ber = (BerElement *)&berbuf;
1965                 ber_tag_t               tag;
1966
1967                 ber_init2( ber, 0, LBER_USE_DER );
1968                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1969
1970                 tag = ber_printf( ber, "O", &authzID );
1971                 if ( tag == LBER_ERROR ) {
1972                         rs->sr_err = LDAP_OTHER;
1973                         goto free_ber;
1974                 }
1975
1976                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1977                         rs->sr_err = LDAP_OTHER;
1978                         goto free_ber;
1979                 }
1980
1981 free_ber:;
1982                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1983                 ber_free_buf( ber );
1984
1985                 if ( rs->sr_err != LDAP_SUCCESS ) {
1986                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1987                         ctrls = NULL;
1988                         goto done;
1989                 }
1990
1991         } else if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
1992                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
1993                                         tmp;
1994                 BerElementBuffer        berbuf;
1995                 BerElement              *ber = (BerElement *)&berbuf;
1996                 ber_tag_t               tag;
1997
1998                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
1999                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2000                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2001                         ctrls = NULL;
2002                         rs->sr_err = LDAP_PROTOCOL_ERROR;
2003                         goto done;
2004                 }
2005
2006                 tmp = authzID;
2007                 tmp.bv_val += STRLENOF( "dn:" );
2008                 tmp.bv_len -= STRLENOF( "dn:" );
2009
2010                 ber_init2( ber, 0, LBER_USE_DER );
2011                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
2012
2013                 /* apparently, Mozilla API encodes this
2014                  * as "SEQUENCE { LDAPDN }" */
2015                 tag = ber_printf( ber, "{O}", &tmp );
2016                 if ( tag == LBER_ERROR ) {
2017                         rs->sr_err = LDAP_OTHER;
2018                         goto free_ber2;
2019                 }
2020
2021                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
2022                         rs->sr_err = LDAP_OTHER;
2023                         goto free_ber2;
2024                 }
2025
2026 free_ber2:;
2027                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
2028                 ber_free_buf( ber );
2029
2030                 if ( rs->sr_err != LDAP_SUCCESS ) {
2031                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2032                         ctrls = NULL;
2033                         goto done;
2034                 }
2035
2036                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
2037         }
2038
2039         if ( op->o_ctrls ) {
2040                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
2041                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
2042                 }
2043         }
2044         ctrls[ i + 1 ] = NULL;
2045
2046 done:;
2047         if ( ctrls == NULL ) {
2048                 ctrls = op->o_ctrls;
2049         }
2050
2051         *pctrls = ctrls;
2052
2053         return rs->sr_err;
2054 }
2055
2056 int
2057 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
2058 {
2059         LDAPControl     **ctrls = *pctrls;
2060
2061         /* we assume that the first control is the proxyAuthz
2062          * added by back-ldap, so it's the only one we explicitly
2063          * free */
2064         if ( ctrls && ctrls != op->o_ctrls ) {
2065                 assert( ctrls[ 0 ] != NULL );
2066
2067                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
2068                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2069                 }
2070
2071                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
2072         }
2073
2074         *pctrls = NULL;
2075
2076         return 0;
2077 }