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 1999-2005 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 #define PRINT_CONNTREE 0
  39
  40 static LDAP_REBIND_PROC ldap_back_rebind;
  41
  42 static int
  43 ldap_back_proxy_authz_bind( struct ldapconn *lc, Operation *op, SlapReply *rs );
  44
  45 static int
  46 ldap_back_prepare_conn( struct ldapconn **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  47
  48 int
  49 ldap_back_bind( Operation *op, SlapReply *rs )
  50 {
  51         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
  52         struct ldapconn *lc;
  53
  54         int rc = 0;
  55         ber_int_t msgid;
  56
  57         lc = ldap_back_getconn( op, rs, LDAP_BACK_SENDERR );
  58         if ( !lc ) {
  59                 return rs->sr_err;
  60         }
  61
  62         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
  63                 ch_free( lc->lc_bound_ndn.bv_val );
  64                 BER_BVZERO( &lc->lc_bound_ndn );
  65         }
  66         lc->lc_bound = 0;
  67
  68         /* method is always LDAP_AUTH_SIMPLE if we got here */
  69         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
  70                         LDAP_SASL_SIMPLE,
  71                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
  72         rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_SENDERR );
  73
  74         if ( rc == LDAP_SUCCESS ) {
  75                 /* If defined, proxyAuthz will be used also when
  76                  * back-ldap is the authorizing backend; for this
  77                  * purpose, a successful bind is followed by a
  78                  * bind with the configured identity assertion */
  79                 /* NOTE: use with care */
  80                 if ( li->idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
  81                         ldap_back_proxy_authz_bind( lc, op, rs );
  82                         if ( lc->lc_bound == 0 ) {
  83                                 rc = 1;
  84                                 goto done;
  85                         }
  86                 }
  87
  88                 lc->lc_bound = 1;
  89                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
  90
  91                 if ( LDAP_BACK_SAVECRED( li ) ) {
  92                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
  93                                 memset( lc->lc_cred.bv_val, 0,
  94                                                 lc->lc_cred.bv_len );
  95                         }
  96                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
  97                         ldap_set_rebind_proc( lc->lc_ld, ldap_back_rebind, lc );
  98                 }
  99         }
 100 done:;
 101
 102         /* must re-insert if local DN changed as result of bind */
 103         if ( lc->lc_bound && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) {
 104                 int             lerr;
 105
 106                 /* wait for all other ops to release the connection */
 107 retry_lock:;
 108                 switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 109                 case LDAP_PVT_THREAD_EBUSY:
 110                 default:
 111                         ldap_pvt_thread_yield();
 112                         goto retry_lock;
 113
 114                 case 0:
 115                         if ( lc->lc_refcnt > 1 ) {
 116                                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 117                                 ldap_pvt_thread_yield();
 118                                 goto retry_lock;
 119                         }
 120                         break;
 121                 }
 122
 123                 assert( lc->lc_refcnt == 1 );
 124                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 125                                 ldap_back_conn_cmp );
 126                 assert( lc != NULL );
 127
 128                 ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 129                 lerr = avl_insert( &li->conntree, (caddr_t)lc,
 130                         ldap_back_conn_cmp, ldap_back_conn_dup );
 131                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 132                 if ( lerr == -1 ) {
 133                         /* we can do this because lc_refcnt == 1 */
 134                         ldap_back_conn_free( lc );
 135                         lc = NULL;
 136                 }
 137         }
 138
 139         if ( lc != NULL ) {
 140                 ldap_back_release_conn( op, rs, lc );
 141         }
 142
 143         return( rc );
 144 }
 145
 146 /*
 147  * ldap_back_conn_cmp
 148  *
 149  * compares two struct ldapconn based on the value of the conn pointer;
 150  * used by avl stuff
 151  */
 152 int
 153 ldap_back_conn_cmp( const void *c1, const void *c2 )
 154 {
 155         const struct ldapconn *lc1 = (const struct ldapconn *)c1;
 156         const struct ldapconn *lc2 = (const struct ldapconn *)c2;
 157         int rc;
 158
 159         /* If local DNs don't match, it is definitely not a match */
 160         rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 161         if ( rc ) {
 162                 return rc;
 163         }
 164
 165         /* For shared sessions, conn is NULL. Only explicitly
 166          * bound sessions will have non-NULL conn.
 167          */
 168         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 169 }
 170
 171 /*
 172  * ldap_back_conn_dup
 173  *
 174  * returns -1 in case a duplicate struct ldapconn has been inserted;
 175  * used by avl stuff
 176  */
 177 int
 178 ldap_back_conn_dup( void *c1, void *c2 )
 179 {
 180         struct ldapconn *lc1 = (struct ldapconn *)c1;
 181         struct ldapconn *lc2 = (struct ldapconn *)c2;
 182
 183         /* Cannot have more than one shared session with same DN */
 184         if ( dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) &&
 185                         lc1->lc_conn == lc2->lc_conn )
 186         {
 187                 return -1;
 188         }
 189
 190         return 0;
 191 }
 192
 193 #if PRINT_CONNTREE > 0
 194 static void
 195 ravl_print( Avlnode *root, int depth )
 196 {
 197         int     i;
 198         struct ldapconn *lc;
 199
 200         if ( root == 0 ) {
 201                 return;
 202         }
 203
 204         ravl_print( root->avl_right, depth+1 );
 205
 206         for ( i = 0; i < depth; i++ ) {
 207                 printf( "   " );
 208         }
 209
 210         lc = root->avl_data;
 211         printf( "lc(%lx) local(%s) conn(%lx) %d\n",
 212                         lc, lc->lc_local_ndn.bv_val, lc->lc_conn, root->avl_bf );
 213
 214         ravl_print( root->avl_left, depth+1 );
 215 }
 216
 217 static void
 218 myprint( Avlnode *root )
 219 {
 220         printf( "********\n" );
 221
 222         if ( root == 0 ) {
 223                 printf( "\tNULL\n" );
 224
 225         } else {
 226                 ravl_print( root, 0 );
 227         }
 228
 229         printf( "********\n" );
 230 }
 231 #endif /* PRINT_CONNTREE */
 232
 233 int
 234 ldap_back_freeconn( Operation *op, struct ldapconn *lc )
 235 {
 236         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
 237
 238         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 239
 240         assert( lc->lc_refcnt > 0 );
 241         if ( --lc->lc_refcnt == 0 ) {
 242                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 243                                 ldap_back_conn_cmp );
 244                 assert( lc != NULL );
 245
 246                 ldap_back_conn_free( (void *)lc );
 247         }
 248
 249         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 250
 251         return 0;
 252 }
 253
 254 #ifdef HAVE_TLS
 255 static int
 256 ldap_back_start_tls(
 257         LDAP            *ld,
 258         int             protocol,
 259         int             *is_tls,
 260         const char      *url,
 261         unsigned        flags,
 262         const char      **text )
 263 {
 264         int             rc = LDAP_SUCCESS;
 265         struct ldapinfo li;
 266
 267         /* this is ridicolous... */
 268         li.flags = flags;
 269
 270         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 271         if ( ( LDAP_BACK_USE_TLS( &li ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &li ) ) )
 272                                 && !ldap_is_ldaps_url( url ) )
 273         {
 274 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 275                 /*
 276                  * use asynchronous StartTLS
 277                  * in case, chase referral (not implemented yet)
 278                  */
 279                 int             msgid;
 280
 281                 if ( protocol == 0 ) {
 282                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 283                                         (void *)&protocol );
 284                 }
 285
 286                 if ( protocol < LDAP_VERSION3 ) {
 287                         protocol = LDAP_VERSION3;
 288                         /* Set LDAP version */
 289                         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 290                                         (const void *)&protocol );
 291                 }
 292
 293                 rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 294                 if ( rc == LDAP_SUCCESS ) {
 295                         LDAPMessage     *res = NULL;
 296                         int             retries = 1;
 297                         struct timeval  tv = { 0, 0 };
 298
 299 retry:;
 300                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 301                         if ( rc < 0 ) {
 302                                 rc = LDAP_OTHER;
 303
 304                         } else if ( rc == 0 ) {
 305                                 if ( retries ) {
 306                                         retries--;
 307                                         tv.tv_sec = 0;
 308                                         tv.tv_usec = 100000;
 309                                         goto retry;
 310                                 }
 311                                 rc = LDAP_OTHER;
 312
 313                         } else if ( rc == LDAP_RES_EXTENDED ) {
 314                                 struct berval   *data = NULL;
 315
 316                                 rc = ldap_parse_extended_result( ld, res,
 317                                                 NULL, &data, 0 );
 318                                 if ( rc == LDAP_SUCCESS ) {
 319                                         rc = ldap_result2error( ld, res, 1 );
 320                                         res = NULL;
 321
 322                                         /* FIXME: in case a referral
 323                                          * is returned, should we try
 324                                          * using it instead of the
 325                                          * configured URI? */
 326                                         if ( rc == LDAP_SUCCESS ) {
 327                                                 rc = ldap_install_tls( ld );
 328
 329                                         } else if ( rc == LDAP_REFERRAL ) {
 330                                                 rc = LDAP_OTHER;
 331                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 332                                         }
 333
 334                                         if ( data ) {
 335                                                 if ( data->bv_val ) {
 336                                                         ber_memfree( data->bv_val );
 337                                                 }
 338                                                 ber_memfree( data );
 339                                         }
 340                                 }
 341
 342                         } else {
 343                                 rc = LDAP_OTHER;
 344                         }
 345
 346                         if ( res != NULL ) {
 347                                 ldap_msgfree( res );
 348                         }
 349                 }
 350 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 351                 /*
 352                  * use synchronous StartTLS
 353                  */
 354                 rc = ldap_start_tls_s( ld, NULL, NULL );
 355 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 356
 357                 /* if StartTLS is requested, only attempt it if the URL
 358                  * is not "ldaps://"; this may occur not only in case
 359                  * of misconfiguration, but also when used in the chain
 360                  * overlay, where the "uri" can be parsed out of a referral */
 361                 switch ( rc ) {
 362                 case LDAP_SUCCESS:
 363                         *is_tls = 1;
 364                         break;
 365
 366                 case LDAP_SERVER_DOWN:
 367                         break;
 368
 369                 default:
 370                         if ( LDAP_BACK_TLS_CRITICAL( &li ) ) {
 371                                 *text = "could not start TLS";
 372                                 break;
 373                         }
 374
 375                         /* in case Start TLS is not critical */
 376                         *is_tls = 0;
 377                         rc = LDAP_SUCCESS;
 378                         break;
 379                 }
 380
 381         } else {
 382                 *is_tls = 0;
 383         }
 384
 385 error_return:;
 386         return rc;
 387 }
 388 #endif /* HAVE_TLS */
 389
 390 static int
 391 ldap_back_prepare_conn( struct ldapconn **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 392 {
 393         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 394         int             vers = op->o_protocol;
 395         LDAP            *ld = NULL;
 396 #ifdef HAVE_TLS
 397         int             is_tls = op->o_conn->c_is_tls;
 398 #endif /* HAVE_TLS */
 399
 400         assert( lcp != NULL );
 401
 402         rs->sr_err = ldap_initialize( &ld, li->url );
 403         if ( rs->sr_err != LDAP_SUCCESS ) {
 404                 goto error_return;
 405         }
 406
 407         /* Set LDAP version. This will always succeed: If the client
 408          * bound with a particular version, then so can we.
 409          */
 410         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&vers );
 411
 412         /* automatically chase referrals ("[dont-]chase-referrals" statement) */
 413         if ( LDAP_BACK_CHASE_REFERRALS( li ) ) {
 414                 ldap_set_option( ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON );
 415         }
 416
 417 #ifdef HAVE_TLS
 418         rs->sr_err = ldap_back_start_tls( ld,
 419                         op->o_protocol, &is_tls,
 420                         li->url, li->flags, &rs->sr_text );
 421         if ( rs->sr_err != LDAP_SUCCESS ) {
 422                 ldap_unbind_ext( ld, NULL, NULL );
 423                 goto error_return;
 424         }
 425 #endif /* HAVE_TLS */
 426
 427         if ( *lcp == NULL ) {
 428                 *lcp = (struct ldapconn *)ch_calloc( 1, sizeof( struct ldapconn ) );
 429                 (*lcp)->lc_flags= li->flags;
 430         }
 431         (*lcp)->lc_ld = ld;
 432         (*lcp)->lc_refcnt = 1;
 433 #ifdef HAVE_TLS
 434         (*lcp)->lc_is_tls = is_tls;
 435 #endif /* HAVE_TLS */
 436
 437 error_return:;
 438         if ( rs->sr_err != LDAP_SUCCESS ) {
 439                 rs->sr_err = slap_map_api2result( rs );
 440                 if ( sendok & LDAP_BACK_SENDERR ) {
 441                         if ( rs->sr_text == NULL ) {
 442                                 rs->sr_text = "ldap_initialize() failed";
 443                         }
 444                         send_ldap_result( op, rs );
 445                         rs->sr_text = NULL;
 446                 }
 447         }
 448
 449         return rs->sr_err;
 450 }
 451
 452 struct ldapconn *
 453 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 454 {
 455         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 456         struct ldapconn *lc,
 457                         lc_curr = { 0 };
 458         int             refcnt = 1;
 459
 460         /* Searches for a ldapconn in the avl tree */
 461
 462         /* Explicit binds must not be shared */
 463         if ( op->o_tag == LDAP_REQ_BIND
 464                 || ( op->o_conn
 465                         && op->o_conn->c_authz_backend
 466                         && op->o_bd->be_private == op->o_conn->c_authz_backend->be_private ) )
 467         {
 468                 lc_curr.lc_conn = op->o_conn;
 469
 470         } else {
 471 #ifdef HAVE_TLS
 472                 if ( op->o_conn->c_is_tls ) {
 473                         lc_curr.lc_conn = LDAP_BACK_PRIV_CONN_TLS;
 474                 } else
 475 #endif /* HAVE_TLS */
 476                 {
 477                         lc_curr.lc_conn = LDAP_BACK_PRIV_CONN;
 478                 }
 479         }
 480
 481         /* Internal searches are privileged and shared. So is root. */
 482         /* FIXME: there seem to be concurrency issues */
 483         if ( op->o_do_not_cache || be_isroot( op ) ) {
 484                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 485 #ifdef HAVE_TLS
 486                 if ( op->o_conn->c_is_tls ) {
 487                         lc_curr.lc_conn = LDAP_BACK_PRIV_CONN_TLS;
 488                 } else
 489 #endif /* HAVE_TLS */
 490                 {
 491                         lc_curr.lc_conn = LDAP_BACK_PRIV_CONN;
 492                 }
 493                 lc_curr.lc_ispriv = 1;
 494
 495         } else {
 496                 lc_curr.lc_local_ndn = op->o_ndn;
 497         }
 498
 499         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 500
 501         lc = (struct ldapconn *)avl_find( li->conntree,
 502                         (caddr_t)&lc_curr, ldap_back_conn_cmp );
 503         if ( lc != NULL ) {
 504                 refcnt = ++lc->lc_refcnt;
 505         }
 506         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 507
 508         /* Looks like we didn't get a bind. Open a new session... */
 509         if ( lc == NULL ) {
 510                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 511                         return NULL;
 512                 }
 513
 514                 lc->lc_conn = lc_curr.lc_conn;
 515                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 516
 517                 if ( lc_curr.lc_ispriv ) {
 518                         ber_dupbv( &lc->lc_cred, &li->acl_passwd );
 519                         ber_dupbv( &lc->lc_bound_ndn, &li->acl_authcDN );
 520                         lc->lc_ispriv = lc_curr.lc_ispriv;
 521
 522                 } else {
 523                         BER_BVZERO( &lc->lc_cred );
 524                         BER_BVZERO( &lc->lc_bound_ndn );
 525                         if ( op->o_conn && !BER_BVISEMPTY( &op->o_ndn )
 526                                 && op->o_bd->be_private == op->o_conn->c_authz_backend->be_private )
 527                         {
 528                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 529                         }
 530                 }
 531
 532 #ifdef HAVE_TLS
 533                 /* if start TLS failed but it was not mandatory,
 534                  * check if the non-TLS connection was already
 535                  * in cache; in case, destroy the newly created
 536                  * connection and use the existing one */
 537                 if ( lc->lc_conn == LDAP_BACK_PRIV_CONN_TLS
 538                                 && !ldap_tls_inplace( lc->lc_ld ) )
 539                 {
 540                         struct ldapconn *tmplc;
 541
 542                         lc_curr.lc_conn = LDAP_BACK_PRIV_CONN;
 543                         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 544                         tmplc = (struct ldapconn *)avl_find( li->conntree,
 545                                         (caddr_t)&lc_curr, ldap_back_conn_cmp );
 546                         if ( tmplc != NULL ) {
 547                                 refcnt = ++tmplc->lc_refcnt;
 548                                 ldap_back_conn_free( lc );
 549                                 lc = tmplc;
 550                         }
 551                         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 552
 553                         if ( tmplc != NULL ) {
 554                                 goto done;
 555                         }
 556                 }
 557 #endif /* HAVE_TLS */
 558
 559                 lc->lc_bound = 0;
 560
 561                 /* Inserts the newly created ldapconn in the avl tree */
 562                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 563
 564                 assert( lc->lc_refcnt == 1 );
 565                 rs->sr_err = avl_insert( &li->conntree, (caddr_t)lc,
 566                         ldap_back_conn_cmp, ldap_back_conn_dup );
 567
 568 #if PRINT_CONNTREE > 0
 569                 myprint( li->conntree );
 570 #endif /* PRINT_CONNTREE */
 571
 572                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 573
 574                 Debug( LDAP_DEBUG_TRACE,
 575                         "=>ldap_back_getconn: conn %p inserted (refcnt=%u)\n",
 576                         (void *)lc, refcnt, 0 );
 577
 578                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 579                 if ( rs->sr_err != 0 ) {
 580                         ldap_back_conn_free( lc );
 581                         rs->sr_err = LDAP_OTHER;
 582                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 583                                 send_ldap_error( op, rs, LDAP_OTHER,
 584                                         "internal server error" );
 585                         }
 586                         return NULL;
 587                 }
 588
 589         } else {
 590                 Debug( LDAP_DEBUG_TRACE,
 591                         "=>ldap_back_getconn: conn %p fetched (refcnt=%u)\n",
 592                         (void *)lc, refcnt, 0 );
 593         }
 594
 595 done:;
 596         return lc;
 597 }
 598
 599 void
 600 ldap_back_release_conn(
 601         Operation               *op,
 602         SlapReply               *rs,
 603         struct ldapconn         *lc )
 604 {
 605         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 606
 607         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 608         assert( lc->lc_refcnt > 0 );
 609         lc->lc_refcnt--;
 610         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 611 }
 612
 613 /*
 614  * ldap_back_dobind
 615  *
 616  * Note: as the check for the value of lc->lc_bound was already here, I removed
 617  * it from all the callers, and I made the function return the flag, so
 618  * it can be used to simplify the check.
 619  *
 620  * Note: dolock indicates whether li->conn_mutex must be locked or not
 621  */
 622 static int
 623 ldap_back_dobind_int(
 624         struct ldapconn         *lc,
 625         Operation               *op,
 626         SlapReply               *rs,
 627         ldap_back_send_t        sendok,
 628         int                     retries,
 629         int                     dolock )
 630 {
 631         int             rc;
 632         ber_int_t       msgid;
 633
 634         assert( retries >= 0 );
 635
 636         if ( !lc->lc_bound ) {
 637                 struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 638
 639                 /*
 640                  * FIXME: we need to let clients use proxyAuthz
 641                  * otherwise we cannot do symmetric pools of servers;
 642                  * we have to live with the fact that a user can
 643                  * authorize itself as any ID that is allowed
 644                  * by the authzTo directive of the "proxyauthzdn".
 645                  */
 646                 /*
 647                  * NOTE: current Proxy Authorization specification
 648                  * and implementation do not allow proxy authorization
 649                  * control to be provided with Bind requests
 650                  */
 651                 /*
 652                  * if no bind took place yet, but the connection is bound
 653                  * and the "idassert-authcDN" (or other ID) is set,
 654                  * then bind as the asserting identity and explicitly
 655                  * add the proxyAuthz control to every operation with the
 656                  * dn bound to the connection as control value.
 657                  * This is done also if this is the authrizing backend,
 658                  * but the "override" flag is given to idassert.
 659                  * It allows to use SASL bind and yet proxyAuthz users
 660                  */
 661                 if ( op->o_conn != NULL &&
 662                                 !op->o_do_not_cache &&
 663                                 ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 664                                   ( li->idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 665                 {
 666                         (void)ldap_back_proxy_authz_bind( lc, op, rs );
 667                         goto done;
 668                 }
 669
 670 #ifdef HAVE_CYRUS_SASL
 671                 if ( lc->lc_ispriv && li->acl_authmethod == LDAP_AUTH_SASL ) {
 672                         void            *defaults = NULL;
 673
 674 #if 1   /* will deal with this later... */
 675                         if ( li->acl_secprops != NULL ) {
 676                                 rc = ldap_set_option( lc->lc_ld,
 677                                         LDAP_OPT_X_SASL_SECPROPS, li->acl_secprops);
 678
 679                                 if( rc != LDAP_OPT_SUCCESS ) {
 680                                         Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 681                                                 "(%s,SECPROPS,\"%s\") failed!\n",
 682                                                 li->url, li->acl_secprops, 0 );
 683                                         goto done;
 684                                 }
 685                         }
 686 #endif
 687
 688                         defaults = lutil_sasl_defaults( lc->lc_ld,
 689                                         li->acl_sasl_mech.bv_val,
 690                                         li->acl_sasl_realm.bv_val,
 691                                         li->acl_authcID.bv_val,
 692                                         li->acl_passwd.bv_val,
 693                                         NULL );
 694
 695                         rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 696                                         li->acl_authcDN.bv_val,
 697                                         li->acl_sasl_mech.bv_val, NULL, NULL,
 698                                         LDAP_SASL_QUIET, lutil_sasl_interact,
 699                                         defaults );
 700
 701                         lutil_sasl_freedefs( defaults );
 702
 703                         rs->sr_err = slap_map_api2result( rs );
 704                         if ( rs->sr_err != LDAP_SUCCESS ) {
 705                                 lc->lc_bound = 0;
 706                                 send_ldap_result( op, rs );
 707
 708                         } else {
 709                                 lc->lc_bound = 1;
 710                         }
 711                         goto done;
 712                 }
 713 #endif /* HAVE_CYRUS_SASL */
 714
 715 retry:;
 716                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 717                                 lc->lc_bound_ndn.bv_val,
 718                                 LDAP_SASL_SIMPLE, &lc->lc_cred,
 719                                 NULL, NULL, &msgid );
 720
 721                 if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 722                         if ( retries > 0 ) {
 723                                 if ( dolock ) {
 724                                         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 725                                 }
 726
 727                                 assert( lc->lc_refcnt > 0 );
 728                                 if ( lc->lc_refcnt == 1 ) {
 729                                         ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 730                                         lc->lc_ld = NULL;
 731
 732                                         /* lc here must be the regular lc, reset and ready for init */
 733                                         rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 734                                 }
 735                                 if ( dolock ) {
 736                                         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 737                                 }
 738                                 if ( rs->sr_err == LDAP_SUCCESS ) {
 739                                         retries--;
 740                                         goto retry;
 741                                 }
 742                         }
 743
 744                         ldap_back_freeconn( op, lc );
 745                         rs->sr_err = slap_map_api2result( rs );
 746
 747                         return 0;
 748                 }
 749
 750                 rc = ldap_back_op_result( lc, op, rs, msgid, sendok );
 751                 if ( rc == LDAP_SUCCESS ) {
 752                         lc->lc_bound = 1;
 753                 }
 754         }
 755
 756 done:;
 757         rc = lc->lc_bound;
 758         return rc;
 759 }
 760
 761 int
 762 ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 763 {
 764         return ldap_back_dobind_int( lc, op, rs, sendok, 1, 1 );
 765 }
 766
 767 /*
 768  * ldap_back_rebind
 769  *
 770  * This is a callback used for chasing referrals using the same
 771  * credentials as the original user on this session.
 772  */
 773 static int
 774 ldap_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 775         ber_int_t msgid, void *params )
 776 {
 777         struct ldapconn *lc = (struct ldapconn *)params;
 778
 779 #ifdef HAVE_TLS
 780         /* ... otherwise we couldn't get here */
 781         assert( lc != NULL );
 782
 783         if ( !ldap_tls_inplace( ld ) ) {
 784                 int             is_tls = lc->lc_is_tls,
 785                                 rc;
 786                 const char      *text = NULL;
 787
 788                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags, &text );
 789                 if ( rc != LDAP_SUCCESS ) {
 790                         return rc;
 791                 }
 792         }
 793 #endif /* HAVE_TLS */
 794
 795         /* FIXME: add checks on the URL/identity? */
 796
 797         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
 798                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
 799 }
 800
 801 int
 802 ldap_back_op_result(
 803                 struct ldapconn         *lc,
 804                 Operation               *op,
 805                 SlapReply               *rs,
 806                 ber_int_t               msgid,
 807                 ldap_back_send_t        sendok )
 808 {
 809         char            *match = NULL;
 810         LDAPMessage     *res = NULL;
 811         char            *text = NULL;
 812
 813 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 814
 815         rs->sr_text = NULL;
 816         rs->sr_matched = NULL;
 817
 818         /* if the error recorded in the reply corresponds
 819          * to a successful state, get the error from the
 820          * remote server response */
 821         if ( ERR_OK( rs->sr_err ) ) {
 822                 int             rc;
 823                 struct timeval  tv = { 0, 0 };
 824
 825 retry:;
 826                 /* if result parsing fails, note the failure reason */
 827                 switch ( ldap_result( lc->lc_ld, msgid, 1, &tv, &res ) ) {
 828                 case 0:
 829                         tv.tv_sec = 0;
 830                         tv.tv_usec = 100000;    /* 0.1 s */
 831                         ldap_pvt_thread_yield();
 832                         goto retry;
 833
 834                 case -1:
 835                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
 836                                         &rs->sr_err );
 837                         break;
 838
 839
 840                 /* otherwise get the result; if it is not
 841                  * LDAP_SUCCESS, record it in the reply
 842                  * structure (this includes
 843                  * LDAP_COMPARE_{TRUE|FALSE}) */
 844                 default:
 845                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 846                                         &match, &text, NULL, NULL, 1 );
 847                         rs->sr_text = text;
 848                         if ( rc != LDAP_SUCCESS ) {
 849                                 rs->sr_err = rc;
 850                         }
 851                 }
 852         }
 853
 854         /* if the error in the reply structure is not
 855          * LDAP_SUCCESS, try to map it from client
 856          * to server error */
 857         if ( !ERR_OK( rs->sr_err ) ) {
 858                 rs->sr_err = slap_map_api2result( rs );
 859
 860                 /* internal ops ( op->o_conn == NULL )
 861                  * must not reply to client */
 862                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 863
 864                         /* record the (massaged) matched
 865                          * DN into the reply structure */
 866                         rs->sr_matched = match;
 867                 }
 868         }
 869         if ( op->o_conn &&
 870                         ( ( sendok & LDAP_BACK_SENDOK )
 871                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
 872         {
 873                 send_ldap_result( op, rs );
 874         }
 875         if ( match ) {
 876                 if ( rs->sr_matched != match ) {
 877                         free( (char *)rs->sr_matched );
 878                 }
 879                 rs->sr_matched = NULL;
 880                 ldap_memfree( match );
 881         }
 882         if ( text ) {
 883                 ldap_memfree( text );
 884         }
 885         rs->sr_text = NULL;
 886         return( ERR_OK( rs->sr_err ) ? 0 : -1 );
 887 }
 888
 889 /* return true if bound, false if failed */
 890 int
 891 ldap_back_retry( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 892 {
 893         int             rc = 0;
 894         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 895
 896         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 897
 898         if ( lc->lc_refcnt == 1 ) {
 899                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 900                 lc->lc_ld = NULL;
 901                 lc->lc_bound = 0;
 902
 903                 /* lc here must be the regular lc, reset and ready for init */
 904                 rc = ldap_back_prepare_conn( &lc, op, rs, sendok );
 905                 if ( rc == LDAP_SUCCESS ) {
 906                         rc = ldap_back_dobind_int( lc, op, rs, sendok, 0, 0 );
 907                 }
 908         }
 909
 910         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 911
 912         return rc;
 913 }
 914
 915 static int
 916 ldap_back_proxy_authz_bind( struct ldapconn *lc, Operation *op, SlapReply *rs )
 917 {
 918         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 919         struct berval   binddn = slap_empty_bv;
 920         struct berval   bindcred = slap_empty_bv;
 921         int             dobind = 0;
 922         int             msgid;
 923         int             rc;
 924
 925         /*
 926          * FIXME: we need to let clients use proxyAuthz
 927          * otherwise we cannot do symmetric pools of servers;
 928          * we have to live with the fact that a user can
 929          * authorize itself as any ID that is allowed
 930          * by the authzTo directive of the "proxyauthzdn".
 931          */
 932         /*
 933          * NOTE: current Proxy Authorization specification
 934          * and implementation do not allow proxy authorization
 935          * control to be provided with Bind requests
 936          */
 937         /*
 938          * if no bind took place yet, but the connection is bound
 939          * and the "proxyauthzdn" is set, then bind as
 940          * "proxyauthzdn" and explicitly add the proxyAuthz
 941          * control to every operation with the dn bound
 942          * to the connection as control value.
 943          */
 944
 945         /* bind as proxyauthzdn only if no idassert mode
 946          * is requested, or if the client's identity
 947          * is authorized */
 948         switch ( li->idassert_mode ) {
 949         case LDAP_BACK_IDASSERT_LEGACY:
 950                 if ( !BER_BVISNULL( &op->o_conn->c_ndn ) && !BER_BVISEMPTY( &op->o_conn->c_ndn ) ) {
 951                         if ( !BER_BVISNULL( &li->idassert_authcDN ) && !BER_BVISEMPTY( &li->idassert_authcDN ) )
 952                         {
 953                                 binddn = li->idassert_authcDN;
 954                                 bindcred = li->idassert_passwd;
 955                                 dobind = 1;
 956                         }
 957                 }
 958                 break;
 959
 960         default:
 961                 /* NOTE: rootdn can always idassert */
 962                 if ( li->idassert_authz && !be_isroot( op ) ) {
 963                         struct berval authcDN;
 964
 965                         if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
 966                                 authcDN = slap_empty_bv;
 967
 968                         } else {
 969                                 authcDN = op->o_conn->c_ndn;
 970                         }
 971                         rs->sr_err = slap_sasl_matches( op, li->idassert_authz,
 972                                         &authcDN, &authcDN );
 973                         if ( rs->sr_err != LDAP_SUCCESS ) {
 974                                 if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
 975                                         send_ldap_result( op, rs );
 976                                         lc->lc_bound = 0;
 977
 978                                 } else {
 979                                         rs->sr_err = LDAP_SUCCESS;
 980                                         binddn = slap_empty_bv;
 981                                         bindcred = slap_empty_bv;
 982                                         break;
 983                                 }
 984
 985                                 goto done;
 986                         }
 987                 }
 988
 989                 binddn = li->idassert_authcDN;
 990                 bindcred = li->idassert_passwd;
 991                 dobind = 1;
 992                 break;
 993         }
 994
 995         if ( dobind && li->idassert_authmethod == LDAP_AUTH_SASL ) {
 996 #ifdef HAVE_CYRUS_SASL
 997                 void            *defaults = NULL;
 998                 struct berval   authzID = BER_BVNULL;
 999                 int             freeauthz = 0;
1000
1001                 /* if SASL supports native authz, prepare for it */
1002                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1003                                 ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1004                 {
1005                         switch ( li->idassert_mode ) {
1006                         case LDAP_BACK_IDASSERT_OTHERID:
1007                         case LDAP_BACK_IDASSERT_OTHERDN:
1008                                 authzID = li->idassert_authzID;
1009                                 break;
1010
1011                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1012                                 BER_BVSTR( &authzID, "dn:" );
1013                                 break;
1014
1015                         case LDAP_BACK_IDASSERT_SELF:
1016                                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1017                                         /* connection is not authc'd, so don't idassert */
1018                                         BER_BVSTR( &authzID, "dn:" );
1019                                         break;
1020                                 }
1021                                 authzID.bv_len = STRLENOF( "dn:" ) + op->o_conn->c_ndn.bv_len;
1022                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1023                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1024                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1025                                                 op->o_conn->c_ndn.bv_val, op->o_conn->c_ndn.bv_len + 1 );
1026                                 freeauthz = 1;
1027                                 break;
1028
1029                         default:
1030                                 break;
1031                         }
1032                 }
1033
1034 #if 0   /* will deal with this later... */
1035                 if ( sasl_secprops != NULL ) {
1036                         rs->sr_err = ldap_set_option( lc->lc_ld, LDAP_OPT_X_SASL_SECPROPS,
1037                                 (void *) sasl_secprops );
1038
1039                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1040                                 send_ldap_result( op, rs );
1041                                 lc->lc_bound = 0;
1042                                 goto done;
1043                         }
1044                 }
1045 #endif
1046
1047                 defaults = lutil_sasl_defaults( lc->lc_ld,
1048                                 li->idassert_sasl_mech.bv_val,
1049                                 li->idassert_sasl_realm.bv_val,
1050                                 li->idassert_authcID.bv_val,
1051                                 li->idassert_passwd.bv_val,
1052                                 authzID.bv_val );
1053
1054                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1055                                 li->idassert_sasl_mech.bv_val, NULL, NULL,
1056                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1057                                 defaults );
1058
1059                 lutil_sasl_freedefs( defaults );
1060                 if ( freeauthz ) {
1061                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1062                 }
1063
1064                 rs->sr_err = slap_map_api2result( rs );
1065                 if ( rs->sr_err != LDAP_SUCCESS ) {
1066                         lc->lc_bound = 0;
1067                         send_ldap_result( op, rs );
1068
1069                 } else {
1070                         lc->lc_bound = 1;
1071                 }
1072                 goto done;
1073 #endif /* HAVE_CYRUS_SASL */
1074         }
1075
1076         switch ( li->idassert_authmethod ) {
1077         case LDAP_AUTH_SIMPLE:
1078                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1079                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1080                                 &bindcred, NULL, NULL, &msgid );
1081                 break;
1082
1083         case LDAP_AUTH_NONE:
1084                 lc->lc_bound = 1;
1085                 goto done;
1086
1087         default:
1088                 /* unsupported! */
1089                 lc->lc_bound = 0;
1090                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1091                 send_ldap_result( op, rs );
1092                 goto done;
1093         }
1094
1095         rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_SENDERR );
1096         if ( rc == LDAP_SUCCESS ) {
1097                 lc->lc_bound = 1;
1098         }
1099 done:;
1100         return lc->lc_bound;
1101 }
1102
1103 /*
1104  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1105  * to existing server-side controls if required; if not,
1106  * the existing server-side controls are placed in *pctrls.
1107  * The caller, after using the controls in client API
1108  * operations, if ( *pctrls != op->o_ctrls ), should
1109  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1110  * The function returns success if the control could
1111  * be added if required, or if it did nothing; in the future,
1112  * it might return some error if it failed.
1113  *
1114  * if no bind took place yet, but the connection is bound
1115  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1116  * and explicitly add proxyAuthz the control to every operation
1117  * with the dn bound to the connection as control value.
1118  *
1119  * If no server-side controls are defined for the operation,
1120  * simply add the proxyAuthz control; otherwise, if the
1121  * proxyAuthz control is not already set, add it as
1122  * the first one
1123  *
1124  * FIXME: is controls order significant for security?
1125  * ANSWER: controls ordering and interoperability
1126  * must be indicated by the specs of each control; if none
1127  * is specified, the order is irrelevant.
1128  */
1129 int
1130 ldap_back_proxy_authz_ctrl(
1131                 struct ldapconn *lc,
1132                 Operation       *op,
1133                 SlapReply       *rs,
1134                 LDAPControl     ***pctrls )
1135 {
1136         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
1137         LDAPControl     **ctrls = NULL;
1138         int             i = 0,
1139                         mode;
1140         struct berval   assertedID;
1141
1142         *pctrls = NULL;
1143
1144         rs->sr_err = LDAP_SUCCESS;
1145
1146         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1147          * but if it is not set this test fails.  We need a different
1148          * means to detect if idassert is enabled */
1149         if ( ( BER_BVISNULL( &li->idassert_authcID ) || BER_BVISEMPTY( &li->idassert_authcID ) )
1150                         && ( BER_BVISNULL( &li->idassert_authcDN ) || BER_BVISEMPTY( &li->idassert_authcDN ) ) )
1151         {
1152                 goto done;
1153         }
1154
1155         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1156                 goto done;
1157         }
1158
1159         if ( li->idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1160                 if ( op->o_proxy_authz ) {
1161                         /*
1162                          * FIXME: we do not want to perform proxyAuthz
1163                          * on behalf of the client, because this would
1164                          * be performed with "proxyauthzdn" privileges.
1165                          *
1166                          * This might actually be too strict, since
1167                          * the "proxyauthzdn" authzTo, and each entry's
1168                          * authzFrom attributes may be crafted
1169                          * to avoid unwanted proxyAuthz to take place.
1170                          */
1171 #if 0
1172                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1173                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1174 #endif
1175                         goto done;
1176                 }
1177
1178                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1179                         goto done;
1180                 }
1181
1182                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1183                         goto done;
1184                 }
1185
1186                 if ( BER_BVISNULL( &li->idassert_authcDN ) ) {
1187                         goto done;
1188                 }
1189
1190         } else if ( li->idassert_authmethod == LDAP_AUTH_SASL ) {
1191                 if ( ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1192                                 /* && ( !BER_BVISNULL( &op->o_conn->c_ndn ) || lc->lc_bound ) */ )
1193                 {
1194                         /* already asserted in SASL via native authz */
1195                         /* NOTE: the test on lc->lc_bound is used to trap
1196                          * native authorization of anonymous users,
1197                          * since in that case op->o_conn->c_ndn is NULL */
1198                         goto done;
1199                 }
1200
1201         } else if ( li->idassert_authz && !be_isroot( op ) ) {
1202                 int             rc;
1203                 struct berval authcDN;
1204
1205                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1206                         authcDN = slap_empty_bv;
1207                 } else {
1208                         authcDN = op->o_conn->c_ndn;
1209                 }
1210                 rc = slap_sasl_matches( op, li->idassert_authz,
1211                                 &authcDN, & authcDN );
1212                 if ( rc != LDAP_SUCCESS ) {
1213                         if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1214                         {
1215                                 /* op->o_conn->c_ndn is not authorized
1216                                  * to use idassert */
1217                                 return rc;
1218                         }
1219                         return rs->sr_err;
1220                 }
1221         }
1222
1223         if ( op->o_proxy_authz ) {
1224                 /*
1225                  * FIXME: we can:
1226                  * 1) ignore the already set proxyAuthz control
1227                  * 2) leave it in place, and don't set ours
1228                  * 3) add both
1229                  * 4) reject the operation
1230                  *
1231                  * option (4) is very drastic
1232                  * option (3) will make the remote server reject
1233                  * the operation, thus being equivalent to (4)
1234                  * option (2) will likely break the idassert
1235                  * assumptions, so we cannot accept it;
1236                  * option (1) means that we are contradicting
1237                  * the client's reques.
1238                  *
1239                  * I think (4) is the only correct choice.
1240                  */
1241                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1242                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1243         }
1244
1245         if ( op->o_do_not_cache && op->o_is_auth_check ) {
1246                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1247
1248         } else {
1249                 mode = li->idassert_mode;
1250         }
1251
1252         switch ( mode ) {
1253         case LDAP_BACK_IDASSERT_LEGACY:
1254         case LDAP_BACK_IDASSERT_SELF:
1255                 /* original behavior:
1256                  * assert the client's identity */
1257                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1258                         assertedID = slap_empty_bv;
1259                 } else {
1260                         assertedID = op->o_conn->c_ndn;
1261                 }
1262                 break;
1263
1264         case LDAP_BACK_IDASSERT_ANONYMOUS:
1265                 /* assert "anonymous" */
1266                 assertedID = slap_empty_bv;
1267                 break;
1268
1269         case LDAP_BACK_IDASSERT_NOASSERT:
1270                 /* don't assert; bind as proxyauthzdn */
1271                 goto done;
1272
1273         case LDAP_BACK_IDASSERT_OTHERID:
1274         case LDAP_BACK_IDASSERT_OTHERDN:
1275                 /* assert idassert DN */
1276                 assertedID = li->idassert_authzID;
1277                 break;
1278
1279         default:
1280                 assert( 0 );
1281         }
1282
1283         if ( BER_BVISNULL( &assertedID ) ) {
1284                 assertedID = slap_empty_bv;
1285         }
1286
1287         if ( op->o_ctrls ) {
1288                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1289                         /* just count ctrls */ ;
1290         }
1291
1292         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
1293         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
1294
1295         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1296         ctrls[ 0 ]->ldctl_iscritical = 1;
1297
1298         switch ( li->idassert_mode ) {
1299         /* already in u:ID or dn:DN form */
1300         case LDAP_BACK_IDASSERT_OTHERID:
1301         case LDAP_BACK_IDASSERT_OTHERDN:
1302                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
1303                 break;
1304
1305         /* needs the dn: prefix */
1306         default:
1307                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1308                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
1309                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1310                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1311                                 assertedID.bv_val, assertedID.bv_len + 1 );
1312                 break;
1313         }
1314
1315         if ( op->o_ctrls ) {
1316                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1317                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1318                 }
1319         }
1320         ctrls[ i + 1 ] = NULL;
1321
1322 done:;
1323         if ( ctrls == NULL ) {
1324                 ctrls = op->o_ctrls;
1325         }
1326
1327         *pctrls = ctrls;
1328
1329         return rs->sr_err;
1330 }
1331
1332 int
1333 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1334 {
1335         LDAPControl     **ctrls = *pctrls;
1336
1337         /* we assume that the first control is the proxyAuthz
1338          * added by back-ldap, so it's the only one we explicitly
1339          * free */
1340         if ( ctrls && ctrls != op->o_ctrls ) {
1341                 assert( ctrls[ 0 ] != NULL );
1342
1343                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1344                         free( ctrls[ 0 ]->ldctl_value.bv_val );
1345                 }
1346
1347                 free( ctrls[ 0 ] );
1348                 free( ctrls );
1349         }
1350
1351         *pctrls = NULL;
1352
1353         return 0;
1354 }