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 ( lc->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         /* Internal searches are privileged and shared. So is root. */
 604         if ( op->o_do_not_cache || be_isroot( op ) ) {
 605                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 606                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 607                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 608
 609         } else {
 610                 lc_curr.lc_local_ndn = op->o_ndn;
 611                 /* Explicit binds must not be shared */
 612                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 613                         lc_curr.lc_conn = op->o_conn;
 614
 615                 } else {
 616                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 617                 }
 618         }
 619
 620         /* Explicit Bind requests always get their own conn */
 621         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 622                 /* Searches for a ldapconn in the avl tree */
 623 retry_lock:
 624                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 625
 626                 lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 627                                 (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 628                 if ( lc != NULL ) {
 629                         /* Don't reuse connections while they're still binding */
 630                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 631                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 632                                 ldap_pvt_thread_yield();
 633                                 goto retry_lock;
 634                         }
 635                         refcnt = ++lc->lc_refcnt;
 636                         binding = ++lc->lc_binding;
 637                 }
 638                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 639         }
 640
 641         /* Looks like we didn't get a bind. Open a new session... */
 642         if ( lc == NULL ) {
 643                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 644                         return NULL;
 645                 }
 646                 if ( sendok & LDAP_BACK_BINDING ) {
 647                         LDAP_BACK_CONN_BINDING_SET( lc );
 648                 }
 649                 lc->lc_conn = lc_curr.lc_conn;
 650                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 651
 652                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 653                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 654                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 655                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 656
 657                 } else {
 658                         BER_BVZERO( &lc->lc_cred );
 659                         BER_BVZERO( &lc->lc_bound_ndn );
 660 #if 0
 661                         /* FIXME: if we set lc_bound_ndn = o_ndn
 662                          * we end up with a bind with DN but no password! */
 663                         if ( !BER_BVISEMPTY( &op->o_ndn )
 664                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 665                         {
 666                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 667                         }
 668 #endif
 669                 }
 670
 671 #ifdef HAVE_TLS
 672                 /* if start TLS failed but it was not mandatory,
 673                  * check if the non-TLS connection was already
 674                  * in cache; in case, destroy the newly created
 675                  * connection and use the existing one */
 676                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 677                                 && !ldap_tls_inplace( lc->lc_ld ) )
 678                 {
 679                         ldapconn_t *tmplc;
 680
 681                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 682                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 683                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 684                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 685                         if ( tmplc != NULL ) {
 686                                 refcnt = ++tmplc->lc_refcnt;
 687                                 binding = ++tmplc->lc_binding;
 688                                 ldap_back_conn_free( lc );
 689                                 lc = tmplc;
 690                         }
 691                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 692
 693                         if ( tmplc != NULL ) {
 694                                 goto done;
 695                         }
 696                 }
 697 #endif /* HAVE_TLS */
 698
 699                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 700
 701                 /* Inserts the newly created ldapconn in the avl tree */
 702                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 703
 704                 assert( lc->lc_refcnt == 1 );
 705                 assert( lc->lc_binding == 1 );
 706                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 707                         ldap_back_conndn_cmp, ldap_back_conndn_dup );
 708
 709 #if PRINT_CONNTREE > 0
 710                 myprint( li->li_conninfo.lai_tree, "ldap_back_getconn" );
 711 #endif /* PRINT_CONNTREE */
 712
 713                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 714
 715                 Debug( LDAP_DEBUG_TRACE,
 716                         "=>ldap_back_getconn: conn %p inserted refcnt=%u binding=%u\n",
 717                         (void *)lc, refcnt, binding );
 718
 719                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 720                 switch ( rs->sr_err ) {
 721                 case 0:
 722                         break;
 723
 724                 case -1:
 725                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 726                                 /* duplicate: free and try to get the newly created one */
 727                                 goto retry_lock;
 728                         }
 729                         /* taint connection, so that it'll be freed when released */
 730                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 731                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 732                                         ldap_back_conndnlc_cmp );
 733                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 734                         LDAP_BACK_CONN_TAINTED_SET( lc );
 735                         break;
 736
 737                 default:
 738                         ldap_back_conn_free( lc );
 739                         rs->sr_err = LDAP_OTHER;
 740                         rs->sr_text = "proxy bind collision";
 741                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 742                                 send_ldap_result( op, rs );
 743                                 rs->sr_text = NULL;
 744                         }
 745                         return NULL;
 746                 }
 747
 748         } else {
 749                 char    buf[ SLAP_TEXT_BUFLEN ];
 750                 int     expiring = 0;
 751
 752                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
 753                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
 754                 {
 755                         expiring = 1;
 756
 757                         /* let it be used, but taint/delete it so that
 758                          * no-one else can look it up any further */
 759                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 760                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 761                                         ldap_back_conndnlc_cmp );
 762                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 763                         LDAP_BACK_CONN_TAINTED_SET( lc );
 764                 }
 765
 766                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 767                         snprintf( buf, sizeof( buf ),
 768                                 "conn %p fetched refcnt=%u binding=%u%s",
 769                                 (void *)lc, refcnt, binding, expiring ? " expiring" : "" );
 770                         Debug( LDAP_DEBUG_TRACE,
 771                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
 772                 }
 773
 774         }
 775
 776 #ifdef HAVE_TLS
 777 done:;
 778 #endif /* HAVE_TLS */
 779         if ( li->li_idle_timeout && lc ) {
 780                 lc->lc_time = op->o_time;
 781         }
 782
 783         return lc;
 784 }
 785
 786 void
 787 ldap_back_release_conn_lock(
 788         Operation               *op,
 789         SlapReply               *rs,
 790         ldapconn_t              *lc,
 791         int                     dolock )
 792 {
 793         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 794
 795         if ( dolock ) {
 796                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 797         }
 798         assert( lc->lc_refcnt > 0 );
 799         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 800         lc->lc_refcnt--;
 801         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
 802                 ldap_back_freeconn( op, lc, 0 );
 803         }
 804         if ( dolock ) {
 805                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 806         }
 807 }
 808
 809 /*
 810  * ldap_back_dobind
 811  *
 812  * Note: as the check for the value of lc->lc_bound was already here, I removed
 813  * it from all the callers, and I made the function return the flag, so
 814  * it can be used to simplify the check.
 815  *
 816  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 817  */
 818 static int
 819 ldap_back_dobind_int(
 820         ldapconn_t              *lc,
 821         Operation               *op,
 822         SlapReply               *rs,
 823         ldap_back_send_t        sendok,
 824         int                     retries,
 825         int                     dolock )
 826 {
 827         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 828
 829         int             rc, binding = 0;
 830         ber_int_t       msgid;
 831
 832         assert( retries >= 0 );
 833
 834 retry_lock:;
 835         if ( dolock ) {
 836                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 837         }
 838
 839         if ( binding == 0 ) {
 840                 /* check if already bound */
 841                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 842                 if ( rc ) {
 843                         lc->lc_binding--;
 844                         if ( dolock ) {
 845                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 846                         }
 847                         return rc;
 848                 }
 849
 850                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 851                         /* if someone else is about to bind it, give up and retry */
 852                         if ( dolock ) {
 853                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 854                         }
 855                         ldap_pvt_thread_yield();
 856                         goto retry_lock;
 857
 858                 } else {
 859                         /* otherwise this thread will bind it */
 860                         LDAP_BACK_CONN_BINDING_SET( lc );
 861                         binding = 1;
 862                 }
 863         }
 864
 865         /* wait for pending operations to finish */
 866         /* FIXME: may become a bottleneck! */
 867         if ( lc->lc_refcnt != lc->lc_binding ) {
 868                 if ( dolock ) {
 869                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 870                 }
 871                 ldap_pvt_thread_yield();
 872                 goto retry_lock;
 873         }
 874
 875         if ( dolock ) {
 876                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 877         }
 878
 879 #if 0
 880         while ( lc->lc_refcnt > 1 ) {
 881                 ldap_pvt_thread_yield();
 882                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 883                 if ( rc ) {
 884                         return rc;
 885                 }
 886         }
 887
 888         if ( dolock ) {
 889                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 890         }
 891         LDAP_BACK_CONN_BINDING_SET( lc );
 892         if ( dolock ) {
 893                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 894         }
 895 #endif
 896
 897         /*
 898          * FIXME: we need to let clients use proxyAuthz
 899          * otherwise we cannot do symmetric pools of servers;
 900          * we have to live with the fact that a user can
 901          * authorize itself as any ID that is allowed
 902          * by the authzTo directive of the "proxyauthzdn".
 903          */
 904         /*
 905          * NOTE: current Proxy Authorization specification
 906          * and implementation do not allow proxy authorization
 907          * control to be provided with Bind requests
 908          */
 909         /*
 910          * if no bind took place yet, but the connection is bound
 911          * and the "idassert-authcDN" (or other ID) is set,
 912          * then bind as the asserting identity and explicitly
 913          * add the proxyAuthz control to every operation with the
 914          * dn bound to the connection as control value.
 915          * This is done also if this is the authrizing backend,
 916          * but the "override" flag is given to idassert.
 917          * It allows to use SASL bind and yet proxyAuthz users
 918          */
 919         if ( op->o_conn != NULL &&
 920                         !op->o_do_not_cache &&
 921                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 922                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 923         {
 924                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok );
 925                 goto done;
 926         }
 927
 928 #ifdef HAVE_CYRUS_SASL
 929         if ( LDAP_BACK_CONN_ISPRIV( lc )
 930                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 931         {
 932                 void            *defaults = NULL;
 933
 934                 if ( li->li_acl_secprops != NULL ) {
 935                         rc = ldap_set_option( lc->lc_ld,
 936                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 937
 938                         if ( rc != LDAP_OPT_SUCCESS ) {
 939                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 940                                         "(SECPROPS,\"%s\") failed!\n",
 941                                         li->li_acl_secprops, 0, 0 );
 942                                 goto done;
 943                         }
 944                 }
 945
 946                 defaults = lutil_sasl_defaults( lc->lc_ld,
 947                                 li->li_acl_sasl_mech.bv_val,
 948                                 li->li_acl_sasl_realm.bv_val,
 949                                 li->li_acl_authcID.bv_val,
 950                                 li->li_acl_passwd.bv_val,
 951                                 NULL );
 952
 953                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 954                                 li->li_acl_authcDN.bv_val,
 955                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 956                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 957                                 defaults );
 958
 959                 lutil_sasl_freedefs( defaults );
 960
 961                 rs->sr_err = slap_map_api2result( rs );
 962                 if ( rs->sr_err != LDAP_SUCCESS ) {
 963                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 964                         send_ldap_result( op, rs );
 965
 966                 } else {
 967                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 968                 }
 969                 goto done;
 970         }
 971 #endif /* HAVE_CYRUS_SASL */
 972
 973 retry:;
 974         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 975                         lc->lc_bound_ndn.bv_val,
 976                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 977                         NULL, NULL, &msgid );
 978
 979         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 980                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 981                         if ( dolock ) {
 982                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 983                         }
 984
 985                         assert( lc->lc_refcnt > 0 );
 986                         if ( lc->lc_refcnt == 1 ) {
 987                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 988                                 lc->lc_ld = NULL;
 989
 990                                 /* lc here must be the regular lc, reset and ready for init */
 991                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 992                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 993                                         lc->lc_binding--;
 994                                         lc->lc_refcnt = 0;
 995                                 }
 996                         }
 997
 998                         if ( dolock ) {
 999                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1000                         }
1001
1002                         if ( rs->sr_err == LDAP_SUCCESS ) {
1003                                 if ( retries > 0 ) {
1004                                         retries--;
1005                                 }
1006                                 goto retry;
1007                         }
1008
1009                 } else {
1010                         if ( dolock ) {
1011                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1012                         }
1013                         lc->lc_binding--;
1014                         if ( dolock ) {
1015                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1016                         }
1017                 }
1018
1019                 lc->lc_binding--;
1020                 ldap_back_freeconn( op, lc, dolock );
1021                 rs->sr_err = slap_map_api2result( rs );
1022
1023                 return 0;
1024         }
1025
1026         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1027         if ( rc == LDAP_SUCCESS ) {
1028                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1029         }
1030
1031 done:;
1032         lc->lc_binding--;
1033         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1034         rc = LDAP_BACK_CONN_ISBOUND( lc );
1035         if ( !rc ) {
1036                 ldap_back_release_conn_lock( op, rs, lc, dolock );
1037         }
1038
1039         return rc;
1040 }
1041
1042 int
1043 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1044 {
1045         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1046
1047         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
1048 }
1049
1050 /*
1051  * ldap_back_default_rebind
1052  *
1053  * This is a callback used for chasing referrals using the same
1054  * credentials as the original user on this session.
1055  */
1056 int
1057 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1058         ber_int_t msgid, void *params )
1059 {
1060         ldapconn_t      *lc = (ldapconn_t *)params;
1061
1062 #ifdef HAVE_TLS
1063         /* ... otherwise we couldn't get here */
1064         assert( lc != NULL );
1065
1066         if ( !ldap_tls_inplace( ld ) ) {
1067                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1068                                 rc;
1069                 const char      *text = NULL;
1070
1071                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1072                         LDAP_BACK_RETRY_DEFAULT, &text );
1073                 if ( rc != LDAP_SUCCESS ) {
1074                         return rc;
1075                 }
1076         }
1077 #endif /* HAVE_TLS */
1078
1079         /* FIXME: add checks on the URL/identity? */
1080
1081         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
1082                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1083 }
1084
1085 /*
1086  * ldap_back_default_urllist
1087  */
1088 int
1089 ldap_back_default_urllist(
1090         LDAP            *ld,
1091         LDAPURLDesc     **urllist,
1092         LDAPURLDesc     **url,
1093         void            *params )
1094 {
1095         ldapinfo_t      *li = (ldapinfo_t *)params;
1096         LDAPURLDesc     **urltail;
1097
1098         if ( urllist == url ) {
1099                 return LDAP_SUCCESS;
1100         }
1101
1102         for ( urltail = &(*url)->lud_next; *urltail; urltail = &(*urltail)->lud_next )
1103                 /* count */ ;
1104
1105         *urltail = *urllist;
1106         *urllist = *url;
1107         *url = NULL;
1108
1109         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1110         if ( li->li_uri ) {
1111                 ch_free( li->li_uri );
1112         }
1113
1114         ldap_get_option( ld, LDAP_OPT_URI, (void *)&li->li_uri );
1115         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1116
1117         return LDAP_SUCCESS;
1118 }
1119
1120 int
1121 ldap_back_op_result(
1122                 ldapconn_t              *lc,
1123                 Operation               *op,
1124                 SlapReply               *rs,
1125                 ber_int_t               msgid,
1126                 time_t                  timeout,
1127                 ldap_back_send_t        sendok )
1128 {
1129         char            *match = NULL;
1130         LDAPMessage     *res = NULL;
1131         char            *text = NULL;
1132
1133 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1134
1135         rs->sr_text = NULL;
1136         rs->sr_matched = NULL;
1137
1138         /* if the error recorded in the reply corresponds
1139          * to a successful state, get the error from the
1140          * remote server response */
1141         if ( ERR_OK( rs->sr_err ) ) {
1142                 int             rc;
1143                 struct timeval  tv;
1144
1145                 if ( timeout ) {
1146                         tv.tv_sec = timeout;
1147                         tv.tv_usec = 0;
1148
1149                 } else {
1150                         LDAP_BACK_TV_SET( &tv );
1151                 }
1152
1153 retry:;
1154                 /* if result parsing fails, note the failure reason */
1155                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1156                 switch ( rc ) {
1157                 case 0:
1158                         if ( timeout ) {
1159                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1160                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
1161                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
1162                                 rs->sr_text = "Operation timed out";
1163                                 break;
1164                         }
1165
1166                         LDAP_BACK_TV_SET( &tv );
1167                         ldap_pvt_thread_yield();
1168                         goto retry;
1169
1170                 case -1:
1171                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1172                                         &rs->sr_err );
1173                         break;
1174
1175
1176                 /* otherwise get the result; if it is not
1177                  * LDAP_SUCCESS, record it in the reply
1178                  * structure (this includes
1179                  * LDAP_COMPARE_{TRUE|FALSE}) */
1180                 default:
1181                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1182                                         &match, &text, NULL, NULL, 1 );
1183                         rs->sr_text = text;
1184                         if ( rc != LDAP_SUCCESS ) {
1185                                 rs->sr_err = rc;
1186                         }
1187                 }
1188         }
1189
1190         /* if the error in the reply structure is not
1191          * LDAP_SUCCESS, try to map it from client
1192          * to server error */
1193         if ( !ERR_OK( rs->sr_err ) ) {
1194                 rs->sr_err = slap_map_api2result( rs );
1195
1196                 /* internal ops ( op->o_conn == NULL )
1197                  * must not reply to client */
1198                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1199
1200                         /* record the (massaged) matched
1201                          * DN into the reply structure */
1202                         rs->sr_matched = match;
1203                 }
1204         }
1205         if ( op->o_conn &&
1206                         ( ( sendok & LDAP_BACK_SENDOK )
1207                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1208         {
1209                 send_ldap_result( op, rs );
1210         }
1211         if ( match ) {
1212                 if ( rs->sr_matched != match ) {
1213                         free( (char *)rs->sr_matched );
1214                 }
1215                 rs->sr_matched = NULL;
1216                 ldap_memfree( match );
1217         }
1218         if ( text ) {
1219                 ldap_memfree( text );
1220         }
1221         rs->sr_text = NULL;
1222         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1223 }
1224
1225 /* return true if bound, false if failed */
1226 int
1227 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1228 {
1229         int             rc = 0;
1230         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1231
1232         assert( lcp != NULL );
1233         assert( *lcp != NULL );
1234
1235         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1236
1237         if ( (*lcp)->lc_refcnt == 1 ) {
1238                 ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1239                 Debug( LDAP_DEBUG_ANY,
1240                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1241                         op->o_log_prefix, li->li_uri,
1242                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1243                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1244                 ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1245
1246                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1247                 (*lcp)->lc_ld = NULL;
1248                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1249
1250                 /* lc here must be the regular lc, reset and ready for init */
1251                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1252                 if ( rc != LDAP_SUCCESS ) {
1253                         rc = 0;
1254                         *lcp = NULL;
1255
1256                 } else {
1257                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1258                         if ( rc == 0 ) {
1259                                 *lcp = NULL;
1260                         }
1261                 }
1262
1263         } else {
1264                 Debug( LDAP_DEBUG_TRACE,
1265                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1266                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1267
1268                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1269                 *lcp = NULL;
1270
1271                 if ( sendok ) {
1272                         rs->sr_err = LDAP_UNAVAILABLE;
1273                         rs->sr_text = "unable to retry";
1274                         send_ldap_result( op, rs );
1275                 }
1276         }
1277
1278         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1279
1280         return rc;
1281 }
1282
1283 static int
1284 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1285 {
1286         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1287         struct berval   binddn = slap_empty_bv;
1288         struct berval   bindcred = slap_empty_bv;
1289         struct berval   ndn;
1290         int             dobind = 0;
1291         int             msgid;
1292         int             rc;
1293
1294         /* don't proxyAuthz if protocol is not LDAPv3 */
1295         switch ( li->li_version ) {
1296         case LDAP_VERSION3:
1297                 break;
1298
1299         case 0:
1300                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1301                         break;
1302                 }
1303                 /* fall thru */
1304
1305         default:
1306                 goto done;
1307         }
1308
1309         if ( op->o_tag == LDAP_REQ_BIND ) {
1310                 ndn = op->o_req_ndn;
1311
1312         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1313                 ndn = op->o_conn->c_ndn;
1314
1315         } else {
1316                 ndn = op->o_ndn;
1317         }
1318
1319         /*
1320          * FIXME: we need to let clients use proxyAuthz
1321          * otherwise we cannot do symmetric pools of servers;
1322          * we have to live with the fact that a user can
1323          * authorize itself as any ID that is allowed
1324          * by the authzTo directive of the "proxyauthzdn".
1325          */
1326         /*
1327          * NOTE: current Proxy Authorization specification
1328          * and implementation do not allow proxy authorization
1329          * control to be provided with Bind requests
1330          */
1331         /*
1332          * if no bind took place yet, but the connection is bound
1333          * and the "proxyauthzdn" is set, then bind as
1334          * "proxyauthzdn" and explicitly add the proxyAuthz
1335          * control to every operation with the dn bound
1336          * to the connection as control value.
1337          */
1338
1339         /* bind as proxyauthzdn only if no idassert mode
1340          * is requested, or if the client's identity
1341          * is authorized */
1342         switch ( li->li_idassert_mode ) {
1343         case LDAP_BACK_IDASSERT_LEGACY:
1344                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1345                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1346                         {
1347                                 binddn = li->li_idassert_authcDN;
1348                                 bindcred = li->li_idassert_passwd;
1349                                 dobind = 1;
1350                         }
1351                 }
1352                 break;
1353
1354         default:
1355                 /* NOTE: rootdn can always idassert */
1356                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1357                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1358                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1359                                 if ( sendok & LDAP_BACK_SENDERR ) {
1360                                         send_ldap_result( op, rs );
1361                                 }
1362                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1363
1364                         } else {
1365                                 rs->sr_err = LDAP_SUCCESS;
1366                                 binddn = slap_empty_bv;
1367                                 bindcred = slap_empty_bv;
1368                                 break;
1369                         }
1370
1371                         goto done;
1372
1373                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1374                         struct berval authcDN;
1375
1376                         if ( BER_BVISNULL( &ndn ) ) {
1377                                 authcDN = slap_empty_bv;
1378
1379                         } else {
1380                                 authcDN = ndn;
1381                         }
1382                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1383                                         &authcDN, &authcDN );
1384                         if ( rs->sr_err != LDAP_SUCCESS ) {
1385                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1386                                         if ( sendok & LDAP_BACK_SENDERR ) {
1387                                                 send_ldap_result( op, rs );
1388                                         }
1389                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1390
1391                                 } else {
1392                                         rs->sr_err = LDAP_SUCCESS;
1393                                         binddn = slap_empty_bv;
1394                                         bindcred = slap_empty_bv;
1395                                         break;
1396                                 }
1397
1398                                 goto done;
1399                         }
1400                 }
1401
1402                 binddn = li->li_idassert_authcDN;
1403                 bindcred = li->li_idassert_passwd;
1404                 dobind = 1;
1405                 break;
1406         }
1407
1408         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1409 #ifdef HAVE_CYRUS_SASL
1410                 void            *defaults = NULL;
1411                 struct berval   authzID = BER_BVNULL;
1412                 int             freeauthz = 0;
1413
1414                 /* if SASL supports native authz, prepare for it */
1415                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1416                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1417                 {
1418                         switch ( li->li_idassert_mode ) {
1419                         case LDAP_BACK_IDASSERT_OTHERID:
1420                         case LDAP_BACK_IDASSERT_OTHERDN:
1421                                 authzID = li->li_idassert_authzID;
1422                                 break;
1423
1424                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1425                                 BER_BVSTR( &authzID, "dn:" );
1426                                 break;
1427
1428                         case LDAP_BACK_IDASSERT_SELF:
1429                                 if ( BER_BVISNULL( &ndn ) ) {
1430                                         /* connection is not authc'd, so don't idassert */
1431                                         BER_BVSTR( &authzID, "dn:" );
1432                                         break;
1433                                 }
1434                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1435                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1436                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1437                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1438                                                 ndn.bv_val, ndn.bv_len + 1 );
1439                                 freeauthz = 1;
1440                                 break;
1441
1442                         default:
1443                                 break;
1444                         }
1445                 }
1446
1447                 if ( li->li_idassert_secprops != NULL ) {
1448                         rs->sr_err = ldap_set_option( lc->lc_ld,
1449                                 LDAP_OPT_X_SASL_SECPROPS,
1450                                 (void *)li->li_idassert_secprops );
1451
1452                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1453                                 rs->sr_err = LDAP_OTHER;
1454                                 if ( sendok & LDAP_BACK_SENDERR ) {
1455                                         send_ldap_result( op, rs );
1456                                 }
1457                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1458                                 goto done;
1459                         }
1460                 }
1461
1462                 defaults = lutil_sasl_defaults( lc->lc_ld,
1463                                 li->li_idassert_sasl_mech.bv_val,
1464                                 li->li_idassert_sasl_realm.bv_val,
1465                                 li->li_idassert_authcID.bv_val,
1466                                 li->li_idassert_passwd.bv_val,
1467                                 authzID.bv_val );
1468
1469                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1470                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1471                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1472                                 defaults );
1473
1474                 rs->sr_err = slap_map_api2result( rs );
1475                 if ( rs->sr_err != LDAP_SUCCESS ) {
1476                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1477                         if ( sendok & LDAP_BACK_SENDERR ) {
1478                                 send_ldap_result( op, rs );
1479                         }
1480
1481                 } else {
1482                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1483                 }
1484
1485                 lutil_sasl_freedefs( defaults );
1486                 if ( freeauthz ) {
1487                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1488                 }
1489
1490                 goto done;
1491 #endif /* HAVE_CYRUS_SASL */
1492         }
1493
1494         switch ( li->li_idassert_authmethod ) {
1495         case LDAP_AUTH_NONE:
1496                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1497                 goto done;
1498
1499         case LDAP_AUTH_SIMPLE:
1500                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1501                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1502                                 &bindcred, NULL, NULL, &msgid );
1503                 break;
1504
1505         default:
1506                 /* unsupported! */
1507                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1508                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1509                 if ( sendok & LDAP_BACK_SENDERR ) {
1510                         send_ldap_result( op, rs );
1511                 }
1512                 goto done;
1513         }
1514
1515         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1516         if ( rc == LDAP_SUCCESS ) {
1517                 /* set rebind stuff in case of successful proxyAuthz bind,
1518                  * so that referral chasing is attempted using the right
1519                  * identity */
1520                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1521                 ber_dupbv( &lc->lc_bound_ndn, &binddn );
1522
1523                 if ( LDAP_BACK_SAVECRED( li ) ) {
1524                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
1525                                 memset( lc->lc_cred.bv_val, 0,
1526                                                 lc->lc_cred.bv_len );
1527                         }
1528                         ber_bvreplace( &lc->lc_cred, &bindcred );
1529                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
1530                 }
1531         }
1532 done:;
1533         return LDAP_BACK_CONN_ISBOUND( lc );
1534 }
1535
1536 /*
1537  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1538  * to existing server-side controls if required; if not,
1539  * the existing server-side controls are placed in *pctrls.
1540  * The caller, after using the controls in client API
1541  * operations, if ( *pctrls != op->o_ctrls ), should
1542  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1543  * The function returns success if the control could
1544  * be added if required, or if it did nothing; in the future,
1545  * it might return some error if it failed.
1546  *
1547  * if no bind took place yet, but the connection is bound
1548  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1549  * and explicitly add proxyAuthz the control to every operation
1550  * with the dn bound to the connection as control value.
1551  *
1552  * If no server-side controls are defined for the operation,
1553  * simply add the proxyAuthz control; otherwise, if the
1554  * proxyAuthz control is not already set, add it as
1555  * the first one
1556  *
1557  * FIXME: is controls order significant for security?
1558  * ANSWER: controls ordering and interoperability
1559  * must be indicated by the specs of each control; if none
1560  * is specified, the order is irrelevant.
1561  */
1562 int
1563 ldap_back_proxy_authz_ctrl(
1564                 ldapconn_t      *lc,
1565                 Operation       *op,
1566                 SlapReply       *rs,
1567                 LDAPControl     ***pctrls )
1568 {
1569         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1570         LDAPControl     **ctrls = NULL;
1571         int             i = 0,
1572                         mode;
1573         struct berval   assertedID,
1574                         ndn;
1575
1576         *pctrls = NULL;
1577
1578         rs->sr_err = LDAP_SUCCESS;
1579
1580         /* don't proxyAuthz if protocol is not LDAPv3 */
1581         switch ( li->li_version ) {
1582         case LDAP_VERSION3:
1583                 break;
1584
1585         case 0:
1586                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1587                         break;
1588                 }
1589                 /* fall thru */
1590
1591         default:
1592                 goto done;
1593         }
1594
1595         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1596          * but if it is not set this test fails.  We need a different
1597          * means to detect if idassert is enabled */
1598         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1599                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1600         {
1601                 goto done;
1602         }
1603
1604         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1605                 goto done;
1606         }
1607
1608         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1609                 ndn = op->o_conn->c_ndn;
1610
1611         } else {
1612                 ndn = op->o_ndn;
1613         }
1614
1615         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1616                 if ( op->o_proxy_authz ) {
1617                         /*
1618                          * FIXME: we do not want to perform proxyAuthz
1619                          * on behalf of the client, because this would
1620                          * be performed with "proxyauthzdn" privileges.
1621                          *
1622                          * This might actually be too strict, since
1623                          * the "proxyauthzdn" authzTo, and each entry's
1624                          * authzFrom attributes may be crafted
1625                          * to avoid unwanted proxyAuthz to take place.
1626                          */
1627 #if 0
1628                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1629                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1630 #endif
1631                         goto done;
1632                 }
1633
1634                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1635                         goto done;
1636                 }
1637
1638                 if ( BER_BVISNULL( &ndn ) ) {
1639                         goto done;
1640                 }
1641
1642                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1643                         goto done;
1644                 }
1645
1646         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1647                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1648                                 /* && ( !BER_BVISNULL( &ndn )
1649                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1650                 {
1651                         /* already asserted in SASL via native authz */
1652                         /* NOTE: the test on lc->lc_bound is used to trap
1653                          * native authorization of anonymous users,
1654                          * since in that case ndn is NULL */
1655                         goto done;
1656                 }
1657
1658         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1659                 int             rc;
1660                 struct berval authcDN;
1661
1662                 if ( BER_BVISNULL( &ndn ) ) {
1663                         authcDN = slap_empty_bv;
1664                 } else {
1665                         authcDN = ndn;
1666                 }
1667                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1668                                 &authcDN, & authcDN );
1669                 if ( rc != LDAP_SUCCESS ) {
1670                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1671                         {
1672                                 /* ndn is not authorized
1673                                  * to use idassert */
1674                                 rs->sr_err = rc;
1675                         }
1676                         goto done;
1677                 }
1678         }
1679
1680         if ( op->o_proxy_authz ) {
1681                 /*
1682                  * FIXME: we can:
1683                  * 1) ignore the already set proxyAuthz control
1684                  * 2) leave it in place, and don't set ours
1685                  * 3) add both
1686                  * 4) reject the operation
1687                  *
1688                  * option (4) is very drastic
1689                  * option (3) will make the remote server reject
1690                  * the operation, thus being equivalent to (4)
1691                  * option (2) will likely break the idassert
1692                  * assumptions, so we cannot accept it;
1693                  * option (1) means that we are contradicting
1694                  * the client's reques.
1695                  *
1696                  * I think (4) is the only correct choice.
1697                  */
1698                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1699                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1700         }
1701
1702         if ( op->o_is_auth_check ) {
1703                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1704
1705         } else {
1706                 mode = li->li_idassert_mode;
1707         }
1708
1709         switch ( mode ) {
1710         case LDAP_BACK_IDASSERT_SELF:
1711                 if ( BER_BVISNULL( &ndn ) ) {
1712                         goto done;
1713                 }
1714                 assertedID = ndn;
1715                 break;
1716
1717         case LDAP_BACK_IDASSERT_LEGACY:
1718                 /* original behavior:
1719                  * assert the client's identity */
1720                 if ( BER_BVISNULL( &ndn ) ) {
1721                         assertedID = slap_empty_bv;
1722                 } else {
1723                         assertedID = ndn;
1724                 }
1725                 break;
1726
1727         case LDAP_BACK_IDASSERT_ANONYMOUS:
1728                 /* assert "anonymous" */
1729                 assertedID = slap_empty_bv;
1730                 break;
1731
1732         case LDAP_BACK_IDASSERT_NOASSERT:
1733                 /* don't assert; bind as proxyauthzdn */
1734                 goto done;
1735
1736         case LDAP_BACK_IDASSERT_OTHERID:
1737         case LDAP_BACK_IDASSERT_OTHERDN:
1738                 /* assert idassert DN */
1739                 assertedID = li->li_idassert_authzID;
1740                 break;
1741
1742         default:
1743                 assert( 0 );
1744         }
1745
1746         if ( BER_BVISNULL( &assertedID ) ) {
1747                 assertedID = slap_empty_bv;
1748         }
1749
1750         /* don't idassert the bound DN (ITS#4497) */
1751         if ( dn_match( &assertedID, &lc->lc_bound_ndn ) ) {
1752                 goto done;
1753         }
1754
1755         if ( op->o_ctrls ) {
1756                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1757                         /* just count ctrls */ ;
1758         }
1759
1760         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1761                         op->o_tmpmemctx );
1762         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1763
1764         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1765         ctrls[ 0 ]->ldctl_iscritical = 1;
1766
1767         switch ( li->li_idassert_mode ) {
1768         /* already in u:ID or dn:DN form */
1769         case LDAP_BACK_IDASSERT_OTHERID:
1770         case LDAP_BACK_IDASSERT_OTHERDN:
1771                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1772                 break;
1773
1774         /* needs the dn: prefix */
1775         default:
1776                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1777                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1778                                 op->o_tmpmemctx );
1779                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1780                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1781                                 assertedID.bv_val, assertedID.bv_len + 1 );
1782                 break;
1783         }
1784
1785         /* Older versions of <draft-weltman-ldapv3-proxy> required
1786          * to encode the value of the authzID (and called it proxyDN);
1787          * this hack provides compatibility with those DSAs that
1788          * implement it this way */
1789         if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
1790                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
1791                 BerElementBuffer        berbuf;
1792                 BerElement              *ber = (BerElement *)&berbuf;
1793                 ber_tag_t               tag;
1794
1795                 ber_init2( ber, 0, LBER_USE_DER );
1796                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1797
1798                 tag = ber_printf( ber, "O", &authzID );
1799                 if ( tag == LBER_ERROR ) {
1800                         rs->sr_err = LDAP_OTHER;
1801                         goto free_ber;
1802                 }
1803
1804                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1805                         rs->sr_err = LDAP_OTHER;
1806                         goto free_ber;
1807                 }
1808
1809 free_ber:;
1810                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1811                 ber_free_buf( ber );
1812
1813                 if ( rs->sr_err != LDAP_SUCCESS ) {
1814                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1815                         ctrls = NULL;
1816                         goto done;
1817                 }
1818
1819         } else if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
1820                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
1821                                         tmp;
1822                 BerElementBuffer        berbuf;
1823                 BerElement              *ber = (BerElement *)&berbuf;
1824                 ber_tag_t               tag;
1825
1826                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
1827                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1828                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1829                         ctrls = NULL;
1830                         rs->sr_err = LDAP_PROTOCOL_ERROR;
1831                         goto done;
1832                 }
1833
1834                 tmp = authzID;
1835                 tmp.bv_val += STRLENOF( "dn:" );
1836                 tmp.bv_len -= STRLENOF( "dn:" );
1837
1838                 ber_init2( ber, 0, LBER_USE_DER );
1839                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1840
1841                 /* apparently, Mozilla API encodes this
1842                  * as "SEQUENCE { LDAPDN }" */
1843                 tag = ber_printf( ber, "{O}", &tmp );
1844                 if ( tag == LBER_ERROR ) {
1845                         rs->sr_err = LDAP_OTHER;
1846                         goto free_ber2;
1847                 }
1848
1849                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1850                         rs->sr_err = LDAP_OTHER;
1851                         goto free_ber2;
1852                 }
1853
1854 free_ber2:;
1855                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1856                 ber_free_buf( ber );
1857
1858                 if ( rs->sr_err != LDAP_SUCCESS ) {
1859                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1860                         ctrls = NULL;
1861                         goto done;
1862                 }
1863
1864                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
1865         }
1866
1867         if ( op->o_ctrls ) {
1868                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1869                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1870                 }
1871         }
1872         ctrls[ i + 1 ] = NULL;
1873
1874 done:;
1875         if ( ctrls == NULL ) {
1876                 ctrls = op->o_ctrls;
1877         }
1878
1879         *pctrls = ctrls;
1880
1881         return rs->sr_err;
1882 }
1883
1884 int
1885 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1886 {
1887         LDAPControl     **ctrls = *pctrls;
1888
1889         /* we assume that the first control is the proxyAuthz
1890          * added by back-ldap, so it's the only one we explicitly
1891          * free */
1892         if ( ctrls && ctrls != op->o_ctrls ) {
1893                 assert( ctrls[ 0 ] != NULL );
1894
1895                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1896                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1897                 }
1898
1899                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
1900         }
1901
1902         *pctrls = NULL;
1903
1904         return 0;
1905 }