git.sur5r.net Git - openldap/blob - servers/slapd/back-ldap/bind.c

   1 /* bind.c - ldap backend bind function */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 1999-2006 The OpenLDAP Foundation.
   6  * Portions Copyright 2000-2003 Pierangelo Masarati.
   7  * Portions Copyright 1999-2003 Howard Chu.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted only as authorized by the OpenLDAP
  12  * Public License.
  13  *
  14  * A copy of this license is available in the file LICENSE in the
  15  * top-level directory of the distribution or, alternatively, at
  16  * <http://www.OpenLDAP.org/license.html>.
  17  */
  18 /* ACKNOWLEDGEMENTS:
  19  * This work was initially developed by Howard Chu for inclusion
  20  * in OpenLDAP Software and subsequently enhanced by Pierangelo
  21  * Masarati.
  22  */
  23
  24 #include "portable.h"
  25
  26 #include <stdio.h>
  27
  28 #include <ac/errno.h>
  29 #include <ac/socket.h>
  30 #include <ac/string.h>
  31
  32 #define AVL_INTERNAL
  33 #include "slap.h"
  34 #include "back-ldap.h"
  35
  36 #include <lutil_ldap.h>
  37
  38 #ifndef PRINT_CONNTREE
  39 #define PRINT_CONNTREE 0
  40 #endif /* !PRINT_CONNTREE */
  41
  42 #define LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ       "2.16.840.1.113730.3.4.12"
  43
  44 static int
  45 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  46
  47 static int
  48 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  49
  50 static int
  51 ldap_back_conndnlc_cmp( const void *c1, const void *c2 );
  52
  53 int
  54 ldap_back_bind( Operation *op, SlapReply *rs )
  55 {
  56         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
  57         ldapconn_t      *lc;
  58
  59         int rc = 0;
  60         ber_int_t msgid;
  61
  62         lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR );
  63         if ( !lc ) {
  64                 return rs->sr_err;
  65         }
  66
  67         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
  68                 ch_free( lc->lc_bound_ndn.bv_val );
  69                 BER_BVZERO( &lc->lc_bound_ndn );
  70         }
  71         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
  72
  73         /* method is always LDAP_AUTH_SIMPLE if we got here */
  74         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
  75                         LDAP_SASL_SIMPLE,
  76                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
  77         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
  78
  79         if ( rc == LDAP_SUCCESS ) {
  80                 /* If defined, proxyAuthz will be used also when
  81                  * back-ldap is the authorizing backend; for this
  82                  * purpose, a successful bind is followed by a
  83                  * bind with the configured identity assertion */
  84                 /* NOTE: use with care */
  85                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
  86                         ldap_back_proxy_authz_bind( lc, op, rs, LDAP_BACK_SENDERR );
  87                         if ( !LDAP_BACK_CONN_ISBOUND( lc ) ) {
  88                                 rc = 1;
  89                                 goto done;
  90                         }
  91                 }
  92
  93                 LDAP_BACK_CONN_ISBOUND_SET( lc );
  94                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
  95
  96                 if ( LDAP_BACK_SAVECRED( li ) ) {
  97                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
  98                                 memset( lc->lc_cred.bv_val, 0,
  99                                                 lc->lc_cred.bv_len );
 100                         }
 101                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
 102                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
 103                 }
 104         }
 105 done:;
 106
 107         assert( lc->lc_binding == 1 );
 108         lc->lc_binding = 0;
 109
 110         /* must re-insert if local DN changed as result of bind */
 111         if ( !LDAP_BACK_CONN_ISBOUND( lc )
 112                 || ( LDAP_BACK_CONN_ISBOUND( lc )
 113                         && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) )
 114         {
 115                 int             lerr = -1;
 116                 ldapconn_t      *tmplc;
 117
 118                 /* wait for all other ops to release the connection */
 119 retry_lock:;
 120                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 121                 if ( lc->lc_refcnt > 1 ) {
 122                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 123                         ldap_pvt_thread_yield();
 124                         goto retry_lock;
 125                 }
 126
 127                 assert( lc->lc_refcnt == 1 );
 128                 tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 129                                 ldap_back_conndnlc_cmp );
 130                 assert( tmplc == NULL || lc == tmplc );
 131
 132                 /* delete all cached connections with the current connection */
 133                 if ( LDAP_BACK_SINGLECONN( li ) ) {
 134                         while ( ( tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc, ldap_back_conn_cmp ) ) != NULL )
 135                         {
 136                                 Debug( LDAP_DEBUG_TRACE,
 137                                         "=>ldap_back_bind: destroying conn %ld (refcnt=%u)\n",
 138                                         LDAP_BACK_PCONN_ID( lc->lc_conn ), lc->lc_refcnt, 0 );
 139
 140                                 if ( lc->lc_refcnt != 0 ) {
 141                                         /* taint it */
 142                                         LDAP_BACK_CONN_TAINTED_SET( tmplc );
 143
 144                                 } else {
 145                                         /*
 146                                          * Needs a test because the handler may be corrupted,
 147                                          * and calling ldap_unbind on a corrupted header results
 148                                          * in a segmentation fault
 149                                          */
 150                                         ldap_back_conn_free( tmplc );
 151                                 }
 152                         }
 153                 }
 154
 155                 if ( LDAP_BACK_CONN_ISBOUND( lc ) ) {
 156                         ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 157                         lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 158                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
 159                 }
 160
 161                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 162                 switch ( lerr ) {
 163                 case 0:
 164                         break;
 165
 166                 case -1:
 167                         /* duplicate; someone else successfully bound
 168                          * on the same connection with the same identity;
 169                          * we can do this because lc_refcnt == 1 */
 170                         ldap_back_conn_free( lc );
 171                         lc = NULL;
 172                 }
 173         }
 174
 175         if ( lc != NULL ) {
 176                 ldap_back_release_conn( op, rs, lc );
 177         }
 178
 179         return( rc );
 180 }
 181
 182 /*
 183  * ldap_back_conndn_cmp
 184  *
 185  * compares two ldapconn_t based on the value of the conn pointer
 186  * and of the local DN; used by avl stuff for insert, lookup
 187  * and direct delete
 188  */
 189 int
 190 ldap_back_conndn_cmp( const void *c1, const void *c2 )
 191 {
 192         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 193         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 194         int rc;
 195
 196         /* If local DNs don't match, it is definitely not a match */
 197         /* For shared sessions, conn is NULL. Only explicitly
 198          * bound sessions will have non-NULL conn.
 199          */
 200         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 201         if ( rc == 0 ) {
 202                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 203         }
 204
 205         return rc;
 206 }
 207
 208 /*
 209  * ldap_back_conndnlc_cmp
 210  *
 211  * compares two ldapconn_t based on the value of the conn pointer,
 212  * the local DN and the lc pointer; used by avl stuff for insert, lookup
 213  * and direct delete
 214  */
 215 static int
 216 ldap_back_conndnlc_cmp( const void *c1, const void *c2 )
 217 {
 218         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 219         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 220         int rc;
 221
 222         /* If local DNs don't match, it is definitely not a match */
 223         /* For shared sessions, conn is NULL. Only explicitly
 224          * bound sessions will have non-NULL conn.
 225          */
 226         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 227         if ( rc == 0 ) {
 228                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 229                 if ( rc == 0 ) {
 230                         rc = SLAP_PTRCMP( lc1, lc2 );
 231                 }
 232         }
 233
 234         return rc;
 235 }
 236
 237 /*
 238  * ldap_back_conn_cmp
 239  *
 240  * compares two ldapconn_t based on the value of the conn pointer;
 241  * used by avl stuff for delete of all conns with the same connid
 242  */
 243 int
 244 ldap_back_conn_cmp( const void *c1, const void *c2 )
 245 {
 246         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 247         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 248
 249         /* For shared sessions, conn is NULL. Only explicitly
 250          * bound sessions will have non-NULL conn.
 251          */
 252         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 253 }
 254
 255 /*
 256  * ldap_back_conndn_dup
 257  *
 258  * returns -1 in case a duplicate ldapconn_t has been inserted;
 259  * used by avl stuff
 260  */
 261 int
 262 ldap_back_conndn_dup( void *c1, void *c2 )
 263 {
 264         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 265         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 266
 267         /* Cannot have more than one shared session with same DN */
 268         if ( lc1->lc_conn == lc2->lc_conn &&
 269                 dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) )
 270         {
 271                 return -1;
 272         }
 273
 274         return 0;
 275 }
 276
 277 #if PRINT_CONNTREE > 0
 278 static void
 279 ravl_print( Avlnode *root, int depth )
 280 {
 281         int             i;
 282         ldapconn_t      *lc;
 283
 284         if ( root == 0 ) {
 285                 return;
 286         }
 287
 288         ravl_print( root->avl_right, depth+1 );
 289
 290         for ( i = 0; i < depth; i++ ) {
 291                 fprintf( stderr, "-" );
 292         }
 293
 294         lc = root->avl_data;
 295         fprintf( stderr, "lc=%p local=\"%s\" conn=%p %s refcnt=%d\n",
 296                 (void *)lc, lc->lc_local_ndn.bv_val, (void *)lc->lc_conn,
 297                 avl_bf2str( root->avl_bf ), lc->lc_refcnt );
 298
 299         ravl_print( root->avl_left, depth+1 );
 300 }
 301
 302 static void
 303 myprint( Avlnode *root )
 304 {
 305         fprintf( stderr, "========>\n" );
 306
 307         if ( root == 0 ) {
 308                 fprintf( stderr, "\tNULL\n" );
 309
 310         } else {
 311                 ravl_print( root, 0 );
 312         }
 313
 314         fprintf( stderr, "<========\n" );
 315 }
 316 #endif /* PRINT_CONNTREE */
 317
 318 int
 319 ldap_back_freeconn( Operation *op, ldapconn_t *lc, int dolock )
 320 {
 321         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 322         ldapconn_t      *tmplc;
 323
 324         if ( dolock ) {
 325                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 326         }
 327
 328         tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 329                         ldap_back_conndnlc_cmp );
 330         assert( LDAP_BACK_CONN_TAINTED( lc ) || tmplc == lc );
 331         if ( lc->lc_refcnt == 0 ) {
 332                 ldap_back_conn_free( (void *)lc );
 333         }
 334
 335         if ( dolock ) {
 336                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 337         }
 338
 339         return 0;
 340 }
 341
 342 #ifdef HAVE_TLS
 343 static int
 344 ldap_back_start_tls(
 345         LDAP            *ld,
 346         int             protocol,
 347         int             *is_tls,
 348         const char      *url,
 349         unsigned        flags,
 350         int             retries,
 351         const char      **text )
 352 {
 353         int             rc = LDAP_SUCCESS;
 354         ldapinfo_t      dummy;
 355
 356         /* this is ridiculous... */
 357         dummy.li_flags = flags;
 358
 359         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 360         if ( ( LDAP_BACK_USE_TLS( &dummy ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &dummy ) ) )
 361                                 && !ldap_is_ldaps_url( url ) )
 362         {
 363 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 364                 /*
 365                  * use asynchronous StartTLS
 366                  * in case, chase referral (not implemented yet)
 367                  */
 368                 int             msgid;
 369
 370                 if ( protocol == 0 ) {
 371                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 372                                         (void *)&protocol );
 373                 }
 374
 375                 if ( protocol < LDAP_VERSION3 ) {
 376                         /* we should rather bail out... */
 377                         rc = LDAP_UNWILLING_TO_PERFORM;
 378                         *text = "invalid protocol version";
 379                 }
 380
 381                 if ( rc == LDAP_SUCCESS ) {
 382                         rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 383                 }
 384
 385                 if ( rc == LDAP_SUCCESS ) {
 386                         LDAPMessage     *res = NULL;
 387                         struct timeval  tv;
 388
 389                         LDAP_BACK_TV_SET( &tv );
 390
 391 retry:;
 392                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 393                         if ( rc < 0 ) {
 394                                 rc = LDAP_UNAVAILABLE;
 395
 396                         } else if ( rc == 0 ) {
 397                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 398                                         ldap_pvt_thread_yield();
 399                                         if ( retries > 0 ) {
 400                                                 retries--;
 401                                         }
 402                                         LDAP_BACK_TV_SET( &tv );
 403                                         goto retry;
 404                                 }
 405                                 rc = LDAP_UNAVAILABLE;
 406
 407                         } else if ( rc == LDAP_RES_EXTENDED ) {
 408                                 struct berval   *data = NULL;
 409
 410                                 rc = ldap_parse_extended_result( ld, res,
 411                                                 NULL, &data, 0 );
 412                                 if ( rc == LDAP_SUCCESS ) {
 413                                         int err;
 414                                         rc = ldap_parse_result( ld, res, &err,
 415                                                 NULL, NULL, NULL, NULL, 1 );
 416                                         if ( rc == LDAP_SUCCESS ) {
 417                                                 rc = err;
 418                                         }
 419                                         res = NULL;
 420
 421                                         /* FIXME: in case a referral
 422                                          * is returned, should we try
 423                                          * using it instead of the
 424                                          * configured URI? */
 425                                         if ( rc == LDAP_SUCCESS ) {
 426                                                 rc = ldap_install_tls( ld );
 427
 428                                         } else if ( rc == LDAP_REFERRAL ) {
 429                                                 rc = LDAP_UNWILLING_TO_PERFORM;
 430                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 431                                         }
 432
 433                                         if ( data ) {
 434                                                 if ( data->bv_val ) {
 435                                                         ber_memfree( data->bv_val );
 436                                                 }
 437                                                 ber_memfree( data );
 438                                         }
 439                                 }
 440
 441                         } else {
 442                                 rc = LDAP_OTHER;
 443                         }
 444
 445                         if ( res != NULL ) {
 446                                 ldap_msgfree( res );
 447                         }
 448                 }
 449 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 450                 /*
 451                  * use synchronous StartTLS
 452                  */
 453                 rc = ldap_start_tls_s( ld, NULL, NULL );
 454 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 455
 456                 /* if StartTLS is requested, only attempt it if the URL
 457                  * is not "ldaps://"; this may occur not only in case
 458                  * of misconfiguration, but also when used in the chain
 459                  * overlay, where the "uri" can be parsed out of a referral */
 460                 switch ( rc ) {
 461                 case LDAP_SUCCESS:
 462                         *is_tls = 1;
 463                         break;
 464
 465                 case LDAP_SERVER_DOWN:
 466                         break;
 467
 468                 default:
 469                         if ( LDAP_BACK_TLS_CRITICAL( &dummy ) ) {
 470                                 *text = "could not start TLS";
 471                                 break;
 472                         }
 473
 474                         /* in case Start TLS is not critical */
 475                         *is_tls = 0;
 476                         rc = LDAP_SUCCESS;
 477                         break;
 478                 }
 479
 480         } else {
 481                 *is_tls = 0;
 482         }
 483
 484         return rc;
 485 }
 486 #endif /* HAVE_TLS */
 487
 488 static int
 489 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 490 {
 491         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 492         int             version;
 493         LDAP            *ld = NULL;
 494 #ifdef HAVE_TLS
 495         int             is_tls = op->o_conn->c_is_tls;
 496 #endif /* HAVE_TLS */
 497
 498         assert( lcp != NULL );
 499
 500         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 501         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 502         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 503         if ( rs->sr_err != LDAP_SUCCESS ) {
 504                 goto error_return;
 505         }
 506
 507         if ( li->li_urllist_f ) {
 508                 ldap_set_urllist_proc( ld, li->li_urllist_f, li->li_urllist_p );
 509         }
 510
 511         /* Set LDAP version. This will always succeed: If the client
 512          * bound with a particular version, then so can we.
 513          */
 514         if ( li->li_version != 0 ) {
 515                 version = li->li_version;
 516
 517         } else if ( op->o_protocol != 0 ) {
 518                 version = op->o_protocol;
 519
 520         } else {
 521                 /* assume it's an internal op; set to LDAPv3 */
 522                 version = LDAP_VERSION3;
 523         }
 524         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&version );
 525
 526         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 527         ldap_set_option( ld, LDAP_OPT_REFERRALS,
 528                 LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 529
 530         if ( li->li_network_timeout > 0 ) {
 531                 struct timeval          tv;
 532
 533                 tv.tv_sec = li->li_network_timeout;
 534                 tv.tv_usec = 0;
 535                 ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
 536         }
 537
 538 #ifdef HAVE_TLS
 539         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 540         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 541                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 542         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 543         if ( rs->sr_err != LDAP_SUCCESS ) {
 544                 ldap_unbind_ext( ld, NULL, NULL );
 545                 goto error_return;
 546         }
 547 #endif /* HAVE_TLS */
 548
 549         if ( *lcp == NULL ) {
 550                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 551                 (*lcp)->lc_flags = li->li_flags;
 552         }
 553         (*lcp)->lc_ld = ld;
 554         (*lcp)->lc_refcnt = 1;
 555         (*lcp)->lc_binding = 1;
 556 #ifdef HAVE_TLS
 557         if ( is_tls ) {
 558                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 559         } else {
 560                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 561         }
 562 #endif /* HAVE_TLS */
 563
 564 error_return:;
 565         if ( rs->sr_err != LDAP_SUCCESS ) {
 566                 rs->sr_err = slap_map_api2result( rs );
 567                 if ( sendok & LDAP_BACK_SENDERR ) {
 568                         if ( rs->sr_text == NULL ) {
 569                                 rs->sr_text = "ldap_initialize() failed";
 570                         }
 571                         send_ldap_result( op, rs );
 572                         rs->sr_text = NULL;
 573                 }
 574
 575         } else {
 576                 if ( li->li_conn_ttl > 0 ) {
 577                         (*lcp)->lc_create_time = op->o_time;
 578                 }
 579         }
 580
 581         return rs->sr_err;
 582 }
 583
 584 ldapconn_t *
 585 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 586 {
 587         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 588         ldapconn_t      *lc = NULL,
 589                         lc_curr = { 0 };
 590         int             refcnt = 1, binding = 1;
 591
 592         /* Internal searches are privileged and shared. So is root. */
 593         if ( op->o_do_not_cache || be_isroot( op ) ) {
 594                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 595                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 596                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 597
 598         } else {
 599                 lc_curr.lc_local_ndn = op->o_ndn;
 600                 /* Explicit binds must not be shared */
 601                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 602                         lc_curr.lc_conn = op->o_conn;
 603
 604                 } else {
 605                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 606                 }
 607         }
 608
 609         /* Explicit Bind requests always get their own conn */
 610         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 611                 /* Searches for a ldapconn in the avl tree */
 612 retry_lock:
 613                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 614
 615                 lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 616                                 (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 617                 if ( lc != NULL ) {
 618                         /* Don't reuse connections while they're still binding */
 619                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 620                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 621                                 ldap_pvt_thread_yield();
 622                                 goto retry_lock;
 623                         }
 624                         refcnt = ++lc->lc_refcnt;
 625                         binding = ++lc->lc_binding;
 626                 }
 627                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 628         }
 629
 630         /* Looks like we didn't get a bind. Open a new session... */
 631         if ( lc == NULL ) {
 632                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 633                         return NULL;
 634                 }
 635                 if ( sendok & LDAP_BACK_BINDING ) {
 636                         LDAP_BACK_CONN_BINDING_SET( lc );
 637                 }
 638                 lc->lc_conn = lc_curr.lc_conn;
 639                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 640
 641                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 642                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 643                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 644                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 645
 646                 } else {
 647                         BER_BVZERO( &lc->lc_cred );
 648                         BER_BVZERO( &lc->lc_bound_ndn );
 649 #if 0
 650                         /* FIXME: if we set lc_bound_ndn = o_ndn
 651                          * we end up with a bind with DN but no password! */
 652                         if ( !BER_BVISEMPTY( &op->o_ndn )
 653                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 654                         {
 655                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 656                         }
 657 #endif
 658                 }
 659
 660 #ifdef HAVE_TLS
 661                 /* if start TLS failed but it was not mandatory,
 662                  * check if the non-TLS connection was already
 663                  * in cache; in case, destroy the newly created
 664                  * connection and use the existing one */
 665                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 666                                 && !ldap_tls_inplace( lc->lc_ld ) )
 667                 {
 668                         ldapconn_t *tmplc;
 669
 670                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 671                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 672                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 673                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 674                         if ( tmplc != NULL ) {
 675                                 refcnt = ++tmplc->lc_refcnt;
 676                                 binding = ++tmplc->lc_binding;
 677                                 ldap_back_conn_free( lc );
 678                                 lc = tmplc;
 679                         }
 680                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 681
 682                         if ( tmplc != NULL ) {
 683                                 goto done;
 684                         }
 685                 }
 686 #endif /* HAVE_TLS */
 687
 688                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 689
 690                 /* Inserts the newly created ldapconn in the avl tree */
 691                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 692
 693                 assert( lc->lc_refcnt == 1 );
 694                 assert( lc->lc_binding == 1 );
 695                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 696                         ldap_back_conndn_cmp, ldap_back_conndn_dup );
 697
 698 #if PRINT_CONNTREE > 0
 699                 myprint( li->li_conninfo.lai_tree );
 700 #endif /* PRINT_CONNTREE */
 701
 702                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 703
 704                 Debug( LDAP_DEBUG_TRACE,
 705                         "=>ldap_back_getconn: conn %p inserted refcnt=%u binding=%u\n",
 706                         (void *)lc, refcnt, binding );
 707
 708                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 709                 switch ( rs->sr_err ) {
 710                 case 0:
 711                         break;
 712
 713                 case -1:
 714                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 715                                 /* duplicate: free and try to get the newly created one */
 716                                 goto retry_lock;
 717                         }
 718                         /* taint connection, so that it'll be freed when released */
 719                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 720                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 721                                         ldap_back_conndnlc_cmp );
 722                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 723                         LDAP_BACK_CONN_TAINTED_SET( lc );
 724                         break;
 725
 726                 default:
 727                         ldap_back_conn_free( lc );
 728                         rs->sr_err = LDAP_OTHER;
 729                         rs->sr_text = "proxy bind collision";
 730                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 731                                 send_ldap_result( op, rs );
 732                                 rs->sr_text = NULL;
 733                         }
 734                         return NULL;
 735                 }
 736
 737         } else {
 738                 char    buf[ SLAP_TEXT_BUFLEN ];
 739                 int     expiring = 0;
 740
 741                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
 742                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
 743                 {
 744                         expiring = 1;
 745
 746                         /* let it be used, but taint/delete it so that
 747                          * no-one else can look it up any further */
 748                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 749                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 750                                         ldap_back_conndnlc_cmp );
 751                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 752                         LDAP_BACK_CONN_TAINTED_SET( lc );
 753                 }
 754
 755                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 756                         snprintf( buf, sizeof( buf ),
 757                                 "conn %p fetched refcnt=%u binding=%u%s",
 758                                 (void *)lc, refcnt, binding, expiring ? " expiring" : "" );
 759                         Debug( LDAP_DEBUG_TRACE,
 760                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
 761                 }
 762
 763         }
 764
 765 #ifdef HAVE_TLS
 766 done:;
 767 #endif /* HAVE_TLS */
 768         if ( li->li_idle_timeout && lc ) {
 769                 lc->lc_time = op->o_time;
 770         }
 771
 772         return lc;
 773 }
 774
 775 void
 776 ldap_back_release_conn_lock(
 777         Operation               *op,
 778         SlapReply               *rs,
 779         ldapconn_t              *lc,
 780         int                     dolock )
 781 {
 782         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 783
 784         if ( dolock ) {
 785                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 786         }
 787         assert( lc->lc_refcnt > 0 );
 788         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 789         lc->lc_refcnt--;
 790         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
 791                 ldap_back_freeconn( op, lc, 0 );
 792         }
 793         if ( dolock ) {
 794                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 795         }
 796 }
 797
 798 /*
 799  * ldap_back_dobind
 800  *
 801  * Note: as the check for the value of lc->lc_bound was already here, I removed
 802  * it from all the callers, and I made the function return the flag, so
 803  * it can be used to simplify the check.
 804  *
 805  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 806  */
 807 static int
 808 ldap_back_dobind_int(
 809         ldapconn_t              *lc,
 810         Operation               *op,
 811         SlapReply               *rs,
 812         ldap_back_send_t        sendok,
 813         int                     retries,
 814         int                     dolock )
 815 {
 816         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 817
 818         int             rc, binding = 0;
 819         ber_int_t       msgid;
 820
 821         assert( retries >= 0 );
 822
 823 retry_lock:;
 824         if ( dolock ) {
 825                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 826         }
 827
 828         if ( binding == 0 ) {
 829                 /* check if already bound */
 830                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 831                 if ( rc ) {
 832                         lc->lc_binding--;
 833                         if ( dolock ) {
 834                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 835                         }
 836                         return rc;
 837                 }
 838
 839                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 840                         /* if someone else is about to bind it, give up and retry */
 841                         if ( dolock ) {
 842                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 843                         }
 844                         ldap_pvt_thread_yield();
 845                         goto retry_lock;
 846
 847                 } else {
 848                         /* otherwise this thread will bind it */
 849                         LDAP_BACK_CONN_BINDING_SET( lc );
 850                         binding = 1;
 851                 }
 852         }
 853
 854         /* wait for pending operations to finish */
 855         /* FIXME: may become a bottleneck! */
 856         if ( lc->lc_refcnt != lc->lc_binding ) {
 857                 if ( dolock ) {
 858                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 859                 }
 860                 ldap_pvt_thread_yield();
 861                 goto retry_lock;
 862         }
 863
 864         if ( dolock ) {
 865                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 866         }
 867
 868 #if 0
 869         while ( lc->lc_refcnt > 1 ) {
 870                 ldap_pvt_thread_yield();
 871                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 872                 if ( rc ) {
 873                         return rc;
 874                 }
 875         }
 876
 877         if ( dolock ) {
 878                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 879         }
 880         LDAP_BACK_CONN_BINDING_SET( lc );
 881         if ( dolock ) {
 882                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 883         }
 884 #endif
 885
 886         /*
 887          * FIXME: we need to let clients use proxyAuthz
 888          * otherwise we cannot do symmetric pools of servers;
 889          * we have to live with the fact that a user can
 890          * authorize itself as any ID that is allowed
 891          * by the authzTo directive of the "proxyauthzdn".
 892          */
 893         /*
 894          * NOTE: current Proxy Authorization specification
 895          * and implementation do not allow proxy authorization
 896          * control to be provided with Bind requests
 897          */
 898         /*
 899          * if no bind took place yet, but the connection is bound
 900          * and the "idassert-authcDN" (or other ID) is set,
 901          * then bind as the asserting identity and explicitly
 902          * add the proxyAuthz control to every operation with the
 903          * dn bound to the connection as control value.
 904          * This is done also if this is the authrizing backend,
 905          * but the "override" flag is given to idassert.
 906          * It allows to use SASL bind and yet proxyAuthz users
 907          */
 908         if ( op->o_conn != NULL &&
 909                         !op->o_do_not_cache &&
 910                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 911                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 912         {
 913                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok );
 914                 goto done;
 915         }
 916
 917 #ifdef HAVE_CYRUS_SASL
 918         if ( LDAP_BACK_CONN_ISPRIV( lc )
 919                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 920         {
 921                 void            *defaults = NULL;
 922
 923                 if ( li->li_acl_secprops != NULL ) {
 924                         rc = ldap_set_option( lc->lc_ld,
 925                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 926
 927                         if ( rc != LDAP_OPT_SUCCESS ) {
 928                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 929                                         "(SECPROPS,\"%s\") failed!\n",
 930                                         li->li_acl_secprops, 0, 0 );
 931                                 goto done;
 932                         }
 933                 }
 934
 935                 defaults = lutil_sasl_defaults( lc->lc_ld,
 936                                 li->li_acl_sasl_mech.bv_val,
 937                                 li->li_acl_sasl_realm.bv_val,
 938                                 li->li_acl_authcID.bv_val,
 939                                 li->li_acl_passwd.bv_val,
 940                                 NULL );
 941
 942                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 943                                 li->li_acl_authcDN.bv_val,
 944                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 945                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 946                                 defaults );
 947
 948                 lutil_sasl_freedefs( defaults );
 949
 950                 rs->sr_err = slap_map_api2result( rs );
 951                 if ( rs->sr_err != LDAP_SUCCESS ) {
 952                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 953                         send_ldap_result( op, rs );
 954
 955                 } else {
 956                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 957                 }
 958                 goto done;
 959         }
 960 #endif /* HAVE_CYRUS_SASL */
 961
 962 retry:;
 963         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 964                         lc->lc_bound_ndn.bv_val,
 965                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 966                         NULL, NULL, &msgid );
 967
 968         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 969                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 970                         if ( dolock ) {
 971                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 972                         }
 973
 974                         assert( lc->lc_refcnt > 0 );
 975                         if ( lc->lc_refcnt == 1 ) {
 976                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 977                                 lc->lc_ld = NULL;
 978
 979                                 /* lc here must be the regular lc, reset and ready for init */
 980                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 981                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 982                                         lc->lc_binding--;
 983                                         lc->lc_refcnt = 0;
 984                                 }
 985                         }
 986
 987                         if ( dolock ) {
 988                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 989                         }
 990
 991                         if ( rs->sr_err == LDAP_SUCCESS ) {
 992                                 if ( retries > 0 ) {
 993                                         retries--;
 994                                 }
 995                                 goto retry;
 996                         }
 997
 998                 } else {
 999                         if ( dolock ) {
1000                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1001                         }
1002                         lc->lc_binding--;
1003                         if ( dolock ) {
1004                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1005                         }
1006                 }
1007
1008                 lc->lc_binding--;
1009                 ldap_back_freeconn( op, lc, dolock );
1010                 rs->sr_err = slap_map_api2result( rs );
1011
1012                 return 0;
1013         }
1014
1015         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1016         if ( rc == LDAP_SUCCESS ) {
1017                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1018         }
1019
1020 done:;
1021         lc->lc_binding--;
1022         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1023         rc = LDAP_BACK_CONN_ISBOUND( lc );
1024         if ( !rc ) {
1025                 ldap_back_release_conn_lock( op, rs, lc, dolock );
1026         }
1027
1028         return rc;
1029 }
1030
1031 int
1032 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1033 {
1034         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1035
1036         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
1037 }
1038
1039 /*
1040  * ldap_back_default_rebind
1041  *
1042  * This is a callback used for chasing referrals using the same
1043  * credentials as the original user on this session.
1044  */
1045 int
1046 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1047         ber_int_t msgid, void *params )
1048 {
1049         ldapconn_t      *lc = (ldapconn_t *)params;
1050
1051 #ifdef HAVE_TLS
1052         /* ... otherwise we couldn't get here */
1053         assert( lc != NULL );
1054
1055         if ( !ldap_tls_inplace( ld ) ) {
1056                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1057                                 rc;
1058                 const char      *text = NULL;
1059
1060                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1061                         LDAP_BACK_RETRY_DEFAULT, &text );
1062                 if ( rc != LDAP_SUCCESS ) {
1063                         return rc;
1064                 }
1065         }
1066 #endif /* HAVE_TLS */
1067
1068         /* FIXME: add checks on the URL/identity? */
1069
1070         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
1071                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1072 }
1073
1074 /*
1075  * ldap_back_default_urllist
1076  */
1077 int
1078 ldap_back_default_urllist(
1079         LDAP            *ld,
1080         LDAPURLDesc     **urllist,
1081         LDAPURLDesc     **url,
1082         void            *params )
1083 {
1084         ldapinfo_t      *li = (ldapinfo_t *)params;
1085         LDAPURLDesc     **urltail;
1086
1087         if ( urllist == url ) {
1088                 return LDAP_SUCCESS;
1089         }
1090
1091         for ( urltail = &(*url)->lud_next; *urltail; urltail = &(*urltail)->lud_next )
1092                 /* count */ ;
1093
1094         *urltail = *urllist;
1095         *urllist = *url;
1096         *url = NULL;
1097
1098         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1099         if ( li->li_uri ) {
1100                 ch_free( li->li_uri );
1101         }
1102
1103         ldap_get_option( ld, LDAP_OPT_URI, (void *)&li->li_uri );
1104         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1105
1106         return LDAP_SUCCESS;
1107 }
1108
1109 int
1110 ldap_back_op_result(
1111                 ldapconn_t              *lc,
1112                 Operation               *op,
1113                 SlapReply               *rs,
1114                 ber_int_t               msgid,
1115                 time_t                  timeout,
1116                 ldap_back_send_t        sendok )
1117 {
1118         char            *match = NULL;
1119         LDAPMessage     *res = NULL;
1120         char            *text = NULL;
1121
1122 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1123
1124         rs->sr_text = NULL;
1125         rs->sr_matched = NULL;
1126
1127         /* if the error recorded in the reply corresponds
1128          * to a successful state, get the error from the
1129          * remote server response */
1130         if ( ERR_OK( rs->sr_err ) ) {
1131                 int             rc;
1132                 struct timeval  tv;
1133
1134                 if ( timeout ) {
1135                         tv.tv_sec = timeout;
1136                         tv.tv_usec = 0;
1137
1138                 } else {
1139                         LDAP_BACK_TV_SET( &tv );
1140                 }
1141
1142 retry:;
1143                 /* if result parsing fails, note the failure reason */
1144                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1145                 switch ( rc ) {
1146                 case 0:
1147                         if ( timeout ) {
1148                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1149                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
1150                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
1151                                 rs->sr_text = "Operation timed out";
1152                                 break;
1153                         }
1154
1155                         LDAP_BACK_TV_SET( &tv );
1156                         ldap_pvt_thread_yield();
1157                         goto retry;
1158
1159                 case -1:
1160                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1161                                         &rs->sr_err );
1162                         break;
1163
1164
1165                 /* otherwise get the result; if it is not
1166                  * LDAP_SUCCESS, record it in the reply
1167                  * structure (this includes
1168                  * LDAP_COMPARE_{TRUE|FALSE}) */
1169                 default:
1170                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1171                                         &match, &text, NULL, NULL, 1 );
1172                         rs->sr_text = text;
1173                         if ( rc != LDAP_SUCCESS ) {
1174                                 rs->sr_err = rc;
1175                         }
1176                 }
1177         }
1178
1179         /* if the error in the reply structure is not
1180          * LDAP_SUCCESS, try to map it from client
1181          * to server error */
1182         if ( !ERR_OK( rs->sr_err ) ) {
1183                 rs->sr_err = slap_map_api2result( rs );
1184
1185                 /* internal ops ( op->o_conn == NULL )
1186                  * must not reply to client */
1187                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1188
1189                         /* record the (massaged) matched
1190                          * DN into the reply structure */
1191                         rs->sr_matched = match;
1192                 }
1193         }
1194         if ( op->o_conn &&
1195                         ( ( sendok & LDAP_BACK_SENDOK )
1196                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1197         {
1198                 send_ldap_result( op, rs );
1199         }
1200         if ( match ) {
1201                 if ( rs->sr_matched != match ) {
1202                         free( (char *)rs->sr_matched );
1203                 }
1204                 rs->sr_matched = NULL;
1205                 ldap_memfree( match );
1206         }
1207         if ( text ) {
1208                 ldap_memfree( text );
1209         }
1210         rs->sr_text = NULL;
1211         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1212 }
1213
1214 /* return true if bound, false if failed */
1215 int
1216 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1217 {
1218         int             rc = 0;
1219         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1220
1221         assert( lcp != NULL );
1222         assert( *lcp != NULL );
1223
1224         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1225
1226         if ( (*lcp)->lc_refcnt == 1 ) {
1227                 ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1228                 Debug( LDAP_DEBUG_ANY,
1229                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1230                         op->o_log_prefix, li->li_uri,
1231                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1232                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1233                 ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1234
1235                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1236                 (*lcp)->lc_ld = NULL;
1237                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1238
1239                 /* lc here must be the regular lc, reset and ready for init */
1240                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1241                 if ( rc != LDAP_SUCCESS ) {
1242                         rc = 0;
1243                         *lcp = NULL;
1244
1245                 } else {
1246                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1247                         if ( rc == 0 ) {
1248                                 *lcp = NULL;
1249                         }
1250                 }
1251
1252         } else {
1253                 Debug( LDAP_DEBUG_TRACE,
1254                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1255                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1256
1257                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1258                 *lcp = NULL;
1259
1260                 if ( sendok ) {
1261                         rs->sr_err = LDAP_UNAVAILABLE;
1262                         rs->sr_text = "unable to retry";
1263                         send_ldap_result( op, rs );
1264                 }
1265         }
1266
1267         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1268
1269         return rc;
1270 }
1271
1272 static int
1273 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1274 {
1275         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1276         struct berval   binddn = slap_empty_bv;
1277         struct berval   bindcred = slap_empty_bv;
1278         struct berval   ndn;
1279         int             dobind = 0;
1280         int             msgid;
1281         int             rc;
1282
1283         /* don't proxyAuthz if protocol is not LDAPv3 */
1284         switch ( li->li_version ) {
1285         case LDAP_VERSION3:
1286                 break;
1287
1288         case 0:
1289                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1290                         break;
1291                 }
1292                 /* fall thru */
1293
1294         default:
1295                 goto done;
1296         }
1297
1298         if ( op->o_tag == LDAP_REQ_BIND ) {
1299                 ndn = op->o_req_ndn;
1300
1301         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1302                 ndn = op->o_conn->c_ndn;
1303
1304         } else {
1305                 ndn = op->o_ndn;
1306         }
1307
1308         /*
1309          * FIXME: we need to let clients use proxyAuthz
1310          * otherwise we cannot do symmetric pools of servers;
1311          * we have to live with the fact that a user can
1312          * authorize itself as any ID that is allowed
1313          * by the authzTo directive of the "proxyauthzdn".
1314          */
1315         /*
1316          * NOTE: current Proxy Authorization specification
1317          * and implementation do not allow proxy authorization
1318          * control to be provided with Bind requests
1319          */
1320         /*
1321          * if no bind took place yet, but the connection is bound
1322          * and the "proxyauthzdn" is set, then bind as
1323          * "proxyauthzdn" and explicitly add the proxyAuthz
1324          * control to every operation with the dn bound
1325          * to the connection as control value.
1326          */
1327
1328         /* bind as proxyauthzdn only if no idassert mode
1329          * is requested, or if the client's identity
1330          * is authorized */
1331         switch ( li->li_idassert_mode ) {
1332         case LDAP_BACK_IDASSERT_LEGACY:
1333                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1334                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1335                         {
1336                                 binddn = li->li_idassert_authcDN;
1337                                 bindcred = li->li_idassert_passwd;
1338                                 dobind = 1;
1339                         }
1340                 }
1341                 break;
1342
1343         default:
1344                 /* NOTE: rootdn can always idassert */
1345                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1346                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1347                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1348                                 if ( sendok & LDAP_BACK_SENDERR ) {
1349                                         send_ldap_result( op, rs );
1350                                 }
1351                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1352
1353                         } else {
1354                                 rs->sr_err = LDAP_SUCCESS;
1355                                 binddn = slap_empty_bv;
1356                                 bindcred = slap_empty_bv;
1357                                 break;
1358                         }
1359
1360                         goto done;
1361
1362                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1363                         struct berval authcDN;
1364
1365                         if ( BER_BVISNULL( &ndn ) ) {
1366                                 authcDN = slap_empty_bv;
1367
1368                         } else {
1369                                 authcDN = ndn;
1370                         }
1371                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1372                                         &authcDN, &authcDN );
1373                         if ( rs->sr_err != LDAP_SUCCESS ) {
1374                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1375                                         if ( sendok & LDAP_BACK_SENDERR ) {
1376                                                 send_ldap_result( op, rs );
1377                                         }
1378                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1379
1380                                 } else {
1381                                         rs->sr_err = LDAP_SUCCESS;
1382                                         binddn = slap_empty_bv;
1383                                         bindcred = slap_empty_bv;
1384                                         break;
1385                                 }
1386
1387                                 goto done;
1388                         }
1389                 }
1390
1391                 binddn = li->li_idassert_authcDN;
1392                 bindcred = li->li_idassert_passwd;
1393                 dobind = 1;
1394                 break;
1395         }
1396
1397         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1398 #ifdef HAVE_CYRUS_SASL
1399                 void            *defaults = NULL;
1400                 struct berval   authzID = BER_BVNULL;
1401                 int             freeauthz = 0;
1402
1403                 /* if SASL supports native authz, prepare for it */
1404                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1405                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1406                 {
1407                         switch ( li->li_idassert_mode ) {
1408                         case LDAP_BACK_IDASSERT_OTHERID:
1409                         case LDAP_BACK_IDASSERT_OTHERDN:
1410                                 authzID = li->li_idassert_authzID;
1411                                 break;
1412
1413                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1414                                 BER_BVSTR( &authzID, "dn:" );
1415                                 break;
1416
1417                         case LDAP_BACK_IDASSERT_SELF:
1418                                 if ( BER_BVISNULL( &ndn ) ) {
1419                                         /* connection is not authc'd, so don't idassert */
1420                                         BER_BVSTR( &authzID, "dn:" );
1421                                         break;
1422                                 }
1423                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1424                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1425                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1426                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1427                                                 ndn.bv_val, ndn.bv_len + 1 );
1428                                 freeauthz = 1;
1429                                 break;
1430
1431                         default:
1432                                 break;
1433                         }
1434                 }
1435
1436                 if ( li->li_idassert_secprops != NULL ) {
1437                         rs->sr_err = ldap_set_option( lc->lc_ld,
1438                                 LDAP_OPT_X_SASL_SECPROPS,
1439                                 (void *)li->li_idassert_secprops );
1440
1441                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1442                                 rs->sr_err = LDAP_OTHER;
1443                                 if ( sendok & LDAP_BACK_SENDERR ) {
1444                                         send_ldap_result( op, rs );
1445                                 }
1446                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1447                                 goto done;
1448                         }
1449                 }
1450
1451                 defaults = lutil_sasl_defaults( lc->lc_ld,
1452                                 li->li_idassert_sasl_mech.bv_val,
1453                                 li->li_idassert_sasl_realm.bv_val,
1454                                 li->li_idassert_authcID.bv_val,
1455                                 li->li_idassert_passwd.bv_val,
1456                                 authzID.bv_val );
1457
1458                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1459                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1460                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1461                                 defaults );
1462
1463                 rs->sr_err = slap_map_api2result( rs );
1464                 if ( rs->sr_err != LDAP_SUCCESS ) {
1465                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1466                         if ( sendok & LDAP_BACK_SENDERR ) {
1467                                 send_ldap_result( op, rs );
1468                         }
1469
1470                 } else {
1471                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1472                 }
1473
1474                 lutil_sasl_freedefs( defaults );
1475                 if ( freeauthz ) {
1476                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1477                 }
1478
1479                 goto done;
1480 #endif /* HAVE_CYRUS_SASL */
1481         }
1482
1483         switch ( li->li_idassert_authmethod ) {
1484         case LDAP_AUTH_NONE:
1485                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1486                 goto done;
1487
1488         case LDAP_AUTH_SIMPLE:
1489                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1490                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1491                                 &bindcred, NULL, NULL, &msgid );
1492                 break;
1493
1494         default:
1495                 /* unsupported! */
1496                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1497                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1498                 if ( sendok & LDAP_BACK_SENDERR ) {
1499                         send_ldap_result( op, rs );
1500                 }
1501                 goto done;
1502         }
1503
1504         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1505         if ( rc == LDAP_SUCCESS ) {
1506                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1507         }
1508 done:;
1509         return LDAP_BACK_CONN_ISBOUND( lc );
1510 }
1511
1512 /*
1513  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1514  * to existing server-side controls if required; if not,
1515  * the existing server-side controls are placed in *pctrls.
1516  * The caller, after using the controls in client API
1517  * operations, if ( *pctrls != op->o_ctrls ), should
1518  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1519  * The function returns success if the control could
1520  * be added if required, or if it did nothing; in the future,
1521  * it might return some error if it failed.
1522  *
1523  * if no bind took place yet, but the connection is bound
1524  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1525  * and explicitly add proxyAuthz the control to every operation
1526  * with the dn bound to the connection as control value.
1527  *
1528  * If no server-side controls are defined for the operation,
1529  * simply add the proxyAuthz control; otherwise, if the
1530  * proxyAuthz control is not already set, add it as
1531  * the first one
1532  *
1533  * FIXME: is controls order significant for security?
1534  * ANSWER: controls ordering and interoperability
1535  * must be indicated by the specs of each control; if none
1536  * is specified, the order is irrelevant.
1537  */
1538 int
1539 ldap_back_proxy_authz_ctrl(
1540                 ldapconn_t      *lc,
1541                 Operation       *op,
1542                 SlapReply       *rs,
1543                 LDAPControl     ***pctrls )
1544 {
1545         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1546         LDAPControl     **ctrls = NULL;
1547         int             i = 0,
1548                         mode;
1549         struct berval   assertedID,
1550                         ndn;
1551
1552         *pctrls = NULL;
1553
1554         rs->sr_err = LDAP_SUCCESS;
1555
1556         /* don't proxyAuthz if protocol is not LDAPv3 */
1557         switch ( li->li_version ) {
1558         case LDAP_VERSION3:
1559                 break;
1560
1561         case 0:
1562                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1563                         break;
1564                 }
1565                 /* fall thru */
1566
1567         default:
1568                 goto done;
1569         }
1570
1571         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1572          * but if it is not set this test fails.  We need a different
1573          * means to detect if idassert is enabled */
1574         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1575                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1576         {
1577                 goto done;
1578         }
1579
1580         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1581                 goto done;
1582         }
1583
1584         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1585                 ndn = op->o_conn->c_ndn;
1586
1587         } else {
1588                 ndn = op->o_ndn;
1589         }
1590
1591         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1592                 if ( op->o_proxy_authz ) {
1593                         /*
1594                          * FIXME: we do not want to perform proxyAuthz
1595                          * on behalf of the client, because this would
1596                          * be performed with "proxyauthzdn" privileges.
1597                          *
1598                          * This might actually be too strict, since
1599                          * the "proxyauthzdn" authzTo, and each entry's
1600                          * authzFrom attributes may be crafted
1601                          * to avoid unwanted proxyAuthz to take place.
1602                          */
1603 #if 0
1604                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1605                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1606 #endif
1607                         goto done;
1608                 }
1609
1610                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1611                         goto done;
1612                 }
1613
1614                 if ( BER_BVISNULL( &ndn ) ) {
1615                         goto done;
1616                 }
1617
1618                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1619                         goto done;
1620                 }
1621
1622         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1623                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1624                                 /* && ( !BER_BVISNULL( &ndn )
1625                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1626                 {
1627                         /* already asserted in SASL via native authz */
1628                         /* NOTE: the test on lc->lc_bound is used to trap
1629                          * native authorization of anonymous users,
1630                          * since in that case ndn is NULL */
1631                         goto done;
1632                 }
1633
1634         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1635                 int             rc;
1636                 struct berval authcDN;
1637
1638                 if ( BER_BVISNULL( &ndn ) ) {
1639                         authcDN = slap_empty_bv;
1640                 } else {
1641                         authcDN = ndn;
1642                 }
1643                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1644                                 &authcDN, & authcDN );
1645                 if ( rc != LDAP_SUCCESS ) {
1646                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1647                         {
1648                                 /* ndn is not authorized
1649                                  * to use idassert */
1650                                 rs->sr_err = rc;
1651                         }
1652                         goto done;
1653                 }
1654         }
1655
1656         if ( op->o_proxy_authz ) {
1657                 /*
1658                  * FIXME: we can:
1659                  * 1) ignore the already set proxyAuthz control
1660                  * 2) leave it in place, and don't set ours
1661                  * 3) add both
1662                  * 4) reject the operation
1663                  *
1664                  * option (4) is very drastic
1665                  * option (3) will make the remote server reject
1666                  * the operation, thus being equivalent to (4)
1667                  * option (2) will likely break the idassert
1668                  * assumptions, so we cannot accept it;
1669                  * option (1) means that we are contradicting
1670                  * the client's reques.
1671                  *
1672                  * I think (4) is the only correct choice.
1673                  */
1674                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1675                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1676         }
1677
1678         if ( op->o_is_auth_check ) {
1679                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1680
1681         } else {
1682                 mode = li->li_idassert_mode;
1683         }
1684
1685         switch ( mode ) {
1686         case LDAP_BACK_IDASSERT_SELF:
1687                 if ( BER_BVISNULL( &ndn ) ) {
1688                         goto done;
1689                 }
1690                 assertedID = ndn;
1691                 break;
1692
1693         case LDAP_BACK_IDASSERT_LEGACY:
1694                 /* original behavior:
1695                  * assert the client's identity */
1696                 if ( BER_BVISNULL( &ndn ) ) {
1697                         assertedID = slap_empty_bv;
1698                 } else {
1699                         assertedID = ndn;
1700                 }
1701                 break;
1702
1703         case LDAP_BACK_IDASSERT_ANONYMOUS:
1704                 /* assert "anonymous" */
1705                 assertedID = slap_empty_bv;
1706                 break;
1707
1708         case LDAP_BACK_IDASSERT_NOASSERT:
1709                 /* don't assert; bind as proxyauthzdn */
1710                 goto done;
1711
1712         case LDAP_BACK_IDASSERT_OTHERID:
1713         case LDAP_BACK_IDASSERT_OTHERDN:
1714                 /* assert idassert DN */
1715                 assertedID = li->li_idassert_authzID;
1716                 break;
1717
1718         default:
1719                 assert( 0 );
1720         }
1721
1722         if ( BER_BVISNULL( &assertedID ) ) {
1723                 assertedID = slap_empty_bv;
1724         }
1725
1726         /* don't idassert the bound DN (ITS#4497) */
1727         if ( dn_match( &assertedID, &lc->lc_bound_ndn ) ) {
1728                 goto done;
1729         }
1730
1731         if ( op->o_ctrls ) {
1732                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1733                         /* just count ctrls */ ;
1734         }
1735
1736         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1737                         op->o_tmpmemctx );
1738         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1739
1740         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1741         ctrls[ 0 ]->ldctl_iscritical = 1;
1742
1743         switch ( li->li_idassert_mode ) {
1744         /* already in u:ID or dn:DN form */
1745         case LDAP_BACK_IDASSERT_OTHERID:
1746         case LDAP_BACK_IDASSERT_OTHERDN:
1747                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1748                 break;
1749
1750         /* needs the dn: prefix */
1751         default:
1752                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1753                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1754                                 op->o_tmpmemctx );
1755                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1756                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1757                                 assertedID.bv_val, assertedID.bv_len + 1 );
1758                 break;
1759         }
1760
1761         /* Older versions of <draft-weltman-ldapv3-proxy> required
1762          * to encode the value of the authzID (and called it proxyDN);
1763          * this hack provides compatibility with those DSAs that
1764          * implement it this way */
1765         if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
1766                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
1767                 BerElementBuffer        berbuf;
1768                 BerElement              *ber = (BerElement *)&berbuf;
1769                 ber_tag_t               tag;
1770
1771                 ber_init2( ber, 0, LBER_USE_DER );
1772                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1773
1774                 tag = ber_printf( ber, "O", &authzID );
1775                 if ( tag == LBER_ERROR ) {
1776                         rs->sr_err = LDAP_OTHER;
1777                         goto free_ber;
1778                 }
1779
1780                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1781                         rs->sr_err = LDAP_OTHER;
1782                         goto free_ber;
1783                 }
1784
1785 free_ber:;
1786                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1787                 ber_free_buf( ber );
1788
1789                 if ( rs->sr_err != LDAP_SUCCESS ) {
1790                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1791                         ctrls = NULL;
1792                         goto done;
1793                 }
1794
1795         } else if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
1796                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
1797                                         tmp;
1798                 BerElementBuffer        berbuf;
1799                 BerElement              *ber = (BerElement *)&berbuf;
1800                 ber_tag_t               tag;
1801
1802                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
1803                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1804                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1805                         ctrls = NULL;
1806                         rs->sr_err = LDAP_PROTOCOL_ERROR;
1807                         goto done;
1808                 }
1809
1810                 tmp = authzID;
1811                 tmp.bv_val += STRLENOF( "dn:" );
1812                 tmp.bv_len -= STRLENOF( "dn:" );
1813
1814                 ber_init2( ber, 0, LBER_USE_DER );
1815                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1816
1817                 /* apparently, Mozilla API encodes this
1818                  * as "SEQUENCE { LDAPDN }" */
1819                 tag = ber_printf( ber, "{O}", &tmp );
1820                 if ( tag == LBER_ERROR ) {
1821                         rs->sr_err = LDAP_OTHER;
1822                         goto free_ber2;
1823                 }
1824
1825                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1826                         rs->sr_err = LDAP_OTHER;
1827                         goto free_ber2;
1828                 }
1829
1830 free_ber2:;
1831                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1832                 ber_free_buf( ber );
1833
1834                 if ( rs->sr_err != LDAP_SUCCESS ) {
1835                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1836                         ctrls = NULL;
1837                         goto done;
1838                 }
1839
1840                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
1841         }
1842
1843         if ( op->o_ctrls ) {
1844                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1845                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1846                 }
1847         }
1848         ctrls[ i + 1 ] = NULL;
1849
1850 done:;
1851         if ( ctrls == NULL ) {
1852                 ctrls = op->o_ctrls;
1853         }
1854
1855         *pctrls = ctrls;
1856
1857         return rs->sr_err;
1858 }
1859
1860 int
1861 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1862 {
1863         LDAPControl     **ctrls = *pctrls;
1864
1865         /* we assume that the first control is the proxyAuthz
1866          * added by back-ldap, so it's the only one we explicitly
1867          * free */
1868         if ( ctrls && ctrls != op->o_ctrls ) {
1869                 assert( ctrls[ 0 ] != NULL );
1870
1871                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1872                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1873                 }
1874
1875                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
1876         }
1877
1878         *pctrls = NULL;
1879
1880         return 0;
1881 }