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 /*
  41  * FIXME: temporarily disable pooled connections, as there seem to be
  42  * some concurrency problem
  43  */
  44 /* #undef LDAP_BACK_POOLED_CONNS */
  45
  46 static LDAP_REBIND_PROC ldap_back_rebind;
  47
  48 static int
  49 ldap_back_proxy_authz_bind( struct ldapconn *lc, Operation *op, SlapReply *rs );
  50
  51 static int
  52 ldap_back_prepare_conn( struct ldapconn **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  53
  54 int
  55 ldap_back_bind( Operation *op, SlapReply *rs )
  56 {
  57         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
  58         struct ldapconn *lc;
  59
  60         int rc = 0;
  61         ber_int_t msgid;
  62
  63         lc = ldap_back_getconn( op, rs, LDAP_BACK_SENDERR );
  64         if ( !lc ) {
  65                 return rs->sr_err;
  66         }
  67
  68         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
  69                 ch_free( lc->lc_bound_ndn.bv_val );
  70                 BER_BVZERO( &lc->lc_bound_ndn );
  71         }
  72         lc->lc_bound = 0;
  73
  74         /* method is always LDAP_AUTH_SIMPLE if we got here */
  75         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
  76                         LDAP_SASL_SIMPLE,
  77                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
  78         rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_SENDERR );
  79
  80         if ( rc == LDAP_SUCCESS ) {
  81                 /* If defined, proxyAuthz will be used also when
  82                  * back-ldap is the authorizing backend; for this
  83                  * purpose, a successful bind is followed by a
  84                  * bind with the configured identity assertion */
  85                 /* NOTE: use with care */
  86                 if ( li->idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
  87                         ldap_back_proxy_authz_bind( lc, op, rs );
  88                         if ( lc->lc_bound == 0 ) {
  89                                 rc = 1;
  90                                 goto done;
  91                         }
  92                 }
  93
  94                 lc->lc_bound = 1;
  95                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
  96
  97                 if ( LDAP_BACK_SAVECRED( li ) ) {
  98                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
  99                                 memset( lc->lc_cred.bv_val, 0,
 100                                                 lc->lc_cred.bv_len );
 101                         }
 102                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
 103                         ldap_set_rebind_proc( lc->lc_ld, ldap_back_rebind, lc );
 104                 }
 105         }
 106 done:;
 107
 108         /* must re-insert if local DN changed as result of bind */
 109         if ( lc->lc_bound && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) {
 110                 int             lerr;
 111
 112                 /* wait for all other ops to release the connection */
 113 retry_lock:;
 114                 switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 115                 case LDAP_PVT_THREAD_EBUSY:
 116                 default:
 117                         ldap_pvt_thread_yield();
 118                         goto retry_lock;
 119
 120                 case 0:
 121                         if ( lc->lc_refcnt > 1 ) {
 122                                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 123                                 ldap_pvt_thread_yield();
 124                                 goto retry_lock;
 125                         }
 126                         break;
 127                 }
 128
 129                 assert( lc->lc_refcnt == 1 );
 130                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 131                                 ldap_back_conn_cmp );
 132                 assert( lc != NULL );
 133
 134                 ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 135                 lerr = avl_insert( &li->conntree, (caddr_t)lc,
 136                         ldap_back_conn_cmp, ldap_back_conn_dup );
 137                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 138                 if ( lerr == -1 ) {
 139                         /* we can do this because lc_refcnt == 1 */
 140                         ldap_back_conn_free( lc );
 141                         lc = NULL;
 142                 }
 143         }
 144
 145         if ( lc != NULL ) {
 146                 ldap_back_release_conn( op, rs, lc );
 147         }
 148
 149         return( rc );
 150 }
 151
 152 /*
 153  * ldap_back_conn_cmp
 154  *
 155  * compares two struct ldapconn based on the value of the conn pointer;
 156  * used by avl stuff
 157  */
 158 int
 159 ldap_back_conn_cmp( const void *c1, const void *c2 )
 160 {
 161         const struct ldapconn *lc1 = (const struct ldapconn *)c1;
 162         const struct ldapconn *lc2 = (const struct ldapconn *)c2;
 163         int rc;
 164
 165         /* If local DNs don't match, it is definitely not a match */
 166         rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 167         if ( rc ) {
 168                 return rc;
 169         }
 170
 171         /* For shared sessions, conn is NULL. Only explicitly
 172          * bound sessions will have non-NULL conn.
 173          */
 174         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 175 }
 176
 177 /*
 178  * ldap_back_conn_dup
 179  *
 180  * returns -1 in case a duplicate struct ldapconn has been inserted;
 181  * used by avl stuff
 182  */
 183 int
 184 ldap_back_conn_dup( void *c1, void *c2 )
 185 {
 186         struct ldapconn *lc1 = (struct ldapconn *)c1;
 187         struct ldapconn *lc2 = (struct ldapconn *)c2;
 188
 189         /* Cannot have more than one shared session with same DN */
 190         if ( dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) &&
 191                         lc1->lc_conn == lc2->lc_conn )
 192         {
 193                 return -1;
 194         }
 195
 196         return 0;
 197 }
 198
 199 #if PRINT_CONNTREE > 0
 200 static void
 201 ravl_print( Avlnode *root, int depth )
 202 {
 203         int     i;
 204         struct ldapconn *lc;
 205
 206         if ( root == 0 ) {
 207                 return;
 208         }
 209
 210         ravl_print( root->avl_right, depth+1 );
 211
 212         for ( i = 0; i < depth; i++ ) {
 213                 printf( "   " );
 214         }
 215
 216         lc = root->avl_data;
 217         printf( "lc(%lx) local(%s) conn(%lx) %d\n",
 218                         lc, lc->lc_local_ndn.bv_val, lc->lc_conn, root->avl_bf );
 219
 220         ravl_print( root->avl_left, depth+1 );
 221 }
 222
 223 static void
 224 myprint( Avlnode *root )
 225 {
 226         printf( "********\n" );
 227
 228         if ( root == 0 ) {
 229                 printf( "\tNULL\n" );
 230
 231         } else {
 232                 ravl_print( root, 0 );
 233         }
 234
 235         printf( "********\n" );
 236 }
 237 #endif /* PRINT_CONNTREE */
 238
 239 int
 240 ldap_back_freeconn( Operation *op, struct ldapconn *lc )
 241 {
 242         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
 243
 244 retry_lock:;
 245         switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 246         case LDAP_PVT_THREAD_EBUSY:
 247         default:
 248                 ldap_pvt_thread_yield();
 249                 goto retry_lock;
 250
 251         case 0:
 252                 break;
 253         }
 254
 255         switch ( ldap_pvt_thread_mutex_trylock( &lc->lc_mutex ) ) {
 256         case LDAP_PVT_THREAD_EBUSY:
 257         default:
 258                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 259                 ldap_pvt_thread_yield();
 260                 goto retry_lock;
 261
 262         case 0:
 263                 break;
 264         }
 265
 266         assert( lc->lc_refcnt > 0 );
 267         if ( --lc->lc_refcnt == 0 ) {
 268                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 269                                 ldap_back_conn_cmp );
 270                 assert( lc != NULL );
 271
 272                 ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 273
 274                 ldap_back_conn_free( (void *)lc );
 275
 276         } else {
 277                 ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 278         }
 279
 280         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 281
 282         return 0;
 283 }
 284
 285 static int
 286 ldap_back_prepare_conn( struct ldapconn **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 287 {
 288         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 289         int             vers = op->o_protocol;
 290         LDAP            *ld = NULL;
 291
 292         assert( lcp != NULL );
 293
 294         rs->sr_err = ldap_initialize( &ld, li->url );
 295         if ( rs->sr_err != LDAP_SUCCESS ) {
 296                 goto error_return;
 297         }
 298
 299         /* Set LDAP version. This will always succeed: If the client
 300          * bound with a particular version, then so can we.
 301          */
 302         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&vers );
 303
 304         /* automatically chase referrals ("[dont-]chase-referrals" statement) */
 305         if ( LDAP_BACK_CHASE_REFERRALS( li ) ) {
 306                 ldap_set_option( ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON );
 307         }
 308
 309 #ifdef HAVE_TLS
 310         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 311         if ( ( LDAP_BACK_USE_TLS( li ) || ( op->o_conn->c_is_tls && LDAP_BACK_PROPAGATE_TLS( li ) ) )
 312                                 && !ldap_is_ldaps_url( li->url ) )
 313         {
 314 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 315                 /*
 316                  * use asynchronous StartTLS
 317                  * in case, chase referral (not implemented yet)
 318                  */
 319                 int             msgid;
 320
 321                 rs->sr_err = ldap_start_tls( ld, NULL, NULL, &msgid );
 322                 if ( rs->sr_err == LDAP_SUCCESS ) {
 323                         LDAPMessage     *res = NULL;
 324                         int             rc, retries = 1;
 325                         struct timeval  tv = { 0, 0 };
 326
 327 retry:;
 328                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 329                         if ( rc < 0 ) {
 330                                 rs->sr_err = LDAP_OTHER;
 331
 332                         } else if ( rc == 0 ) {
 333                                 if ( retries ) {
 334                                         retries--;
 335                                         tv.tv_sec = 0;
 336                                         tv.tv_usec = 100000;
 337                                         goto retry;
 338                                 }
 339                                 rs->sr_err = LDAP_OTHER;
 340
 341                         } else if ( rc == LDAP_RES_EXTENDED ) {
 342                                 struct berval   *data = NULL;
 343
 344                                 rs->sr_err = ldap_parse_extended_result( ld, res,
 345                                                 NULL, &data, 0 );
 346                                 if ( rs->sr_err == LDAP_SUCCESS ) {
 347                                         rs->sr_err = ldap_result2error( ld, res, 1 );
 348                                         res = NULL;
 349
 350                                         /* FIXME: in case a referral
 351                                          * is returned, should we try
 352                                          * using it instead of the
 353                                          * configured URI? */
 354                                         if ( rs->sr_err == LDAP_SUCCESS ) {
 355                                                 ldap_install_tls( ld );
 356
 357                                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
 358                                                 rs->sr_err = LDAP_OTHER;
 359                                                 rs->sr_text = "unwilling to chase referral returned by Start TLS exop";
 360                                         }
 361
 362                                         if ( data ) {
 363                                                 if ( data->bv_val ) {
 364                                                         ber_memfree( data->bv_val );
 365                                                 }
 366                                                 ber_memfree( data );
 367                                         }
 368                                 }
 369
 370                         } else {
 371                                 rs->sr_err = LDAP_OTHER;
 372                         }
 373
 374                         if ( res != NULL ) {
 375                                 ldap_msgfree( res );
 376                         }
 377                 }
 378 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 379                 /*
 380                  * use synchronous StartTLS
 381                  */
 382                 rs->sr_err = ldap_start_tls_s( ld, NULL, NULL );
 383 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 384
 385                 /* if StartTLS is requested, only attempt it if the URL
 386                  * is not "ldaps://"; this may occur not only in case
 387                  * of misconfiguration, but also when used in the chain
 388                  * overlay, where the "uri" can be parsed out of a referral */
 389                 if ( rs->sr_err == LDAP_SERVER_DOWN
 390                                 || ( rs->sr_err != LDAP_SUCCESS && LDAP_BACK_TLS_CRITICAL( li ) ) )
 391                 {
 392                         ldap_unbind_ext_s( ld, NULL, NULL );
 393                         goto error_return;
 394                 }
 395
 396                 /* in case Start TLS is not critical */
 397                 rs->sr_err = LDAP_SUCCESS;
 398         }
 399 #endif /* HAVE_TLS */
 400
 401         if ( *lcp == NULL ) {
 402                 *lcp = (struct ldapconn *)ch_calloc( 1, sizeof( struct ldapconn ) );
 403         }
 404         (*lcp)->lc_ld = ld;
 405         (*lcp)->lc_refcnt = 1;
 406
 407 error_return:;
 408         if ( rs->sr_err != LDAP_SUCCESS ) {
 409                 rs->sr_err = slap_map_api2result( rs );
 410                 if ( sendok & LDAP_BACK_SENDERR ) {
 411                         if ( rs->sr_text == NULL ) {
 412                                 rs->sr_text = "ldap_initialize() failed";
 413                         }
 414                         send_ldap_result( op, rs );
 415                         rs->sr_text = NULL;
 416                 }
 417         }
 418
 419         return rs->sr_err;
 420 }
 421
 422 struct ldapconn *
 423 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 424 {
 425         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 426         struct ldapconn *lc, lc_curr = { 0 };
 427
 428         /* Searches for a ldapconn in the avl tree */
 429
 430         /* Explicit binds must not be shared */
 431         if ( op->o_tag == LDAP_REQ_BIND
 432                 || ( op->o_conn
 433                         && op->o_conn->c_authz_backend
 434                         && op->o_bd->be_private == op->o_conn->c_authz_backend->be_private ) )
 435         {
 436                 lc_curr.lc_conn = op->o_conn;
 437
 438         } else {
 439                 lc_curr.lc_conn = NULL;
 440         }
 441
 442         /* Internal searches are privileged and shared. So is root. */
 443 #ifdef LDAP_BACK_POOLED_CONNS
 444         /* FIXME: there seem to be concurrency issues */
 445         if ( op->o_do_not_cache || be_isroot( op ) ) {
 446                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 447                 lc_curr.lc_conn = NULL;
 448                 lc_curr.lc_ispriv = 1;
 449
 450         } else
 451 #endif /* LDAP_BACK_POOLED_CONNS */
 452         {
 453                 lc_curr.lc_local_ndn = op->o_ndn;
 454         }
 455
 456 retry_lock:;
 457         switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 458         case LDAP_PVT_THREAD_EBUSY:
 459         default:
 460                 ldap_pvt_thread_yield();
 461                 goto retry_lock;
 462
 463         case 0:
 464                 break;
 465         }
 466
 467         lc = (struct ldapconn *)avl_find( li->conntree,
 468                         (caddr_t)&lc_curr, ldap_back_conn_cmp );
 469         if ( lc != NULL ) {
 470                 lc->lc_refcnt++;
 471         }
 472         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 473
 474         /* Looks like we didn't get a bind. Open a new session... */
 475         if ( lc == NULL ) {
 476                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 477                         return NULL;
 478                 }
 479
 480                 lc->lc_conn = lc_curr.lc_conn;
 481                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 482
 483                 ldap_pvt_thread_mutex_init( &lc->lc_mutex );
 484
 485                 if ( lc_curr.lc_ispriv ) {
 486                         ber_dupbv( &lc->lc_cred, &li->acl_passwd );
 487                         ber_dupbv( &lc->lc_bound_ndn, &li->acl_authcDN );
 488                         lc->lc_ispriv = lc_curr.lc_ispriv;
 489
 490                 } else {
 491                         BER_BVZERO( &lc->lc_cred );
 492                         BER_BVZERO( &lc->lc_bound_ndn );
 493                         if ( op->o_conn && !BER_BVISEMPTY( &op->o_ndn )
 494                                 && op->o_bd->be_private == op->o_conn->c_authz_backend->be_private )
 495                         {
 496                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 497                         }
 498                 }
 499
 500                 lc->lc_bound = 0;
 501
 502                 /* Inserts the newly created ldapconn in the avl tree */
 503 retry_lock2:;
 504                 switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 505                 case LDAP_PVT_THREAD_EBUSY:
 506                 default:
 507                         ldap_pvt_thread_yield();
 508                         goto retry_lock2;
 509
 510                 case 0:
 511                         break;
 512                 }
 513
 514                 assert( lc->lc_refcnt == 1 );
 515                 rs->sr_err = avl_insert( &li->conntree, (caddr_t)lc,
 516                         ldap_back_conn_cmp, ldap_back_conn_dup );
 517
 518 #if PRINT_CONNTREE > 0
 519                 myprint( li->conntree );
 520 #endif /* PRINT_CONNTREE */
 521
 522                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 523
 524                 Debug( LDAP_DEBUG_TRACE,
 525                         "=>ldap_back_getconn: conn %p inserted (refcnt=%u)\n",
 526                         (void *)lc, lc->lc_refcnt, 0 );
 527
 528                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 529                 if ( rs->sr_err != 0 ) {
 530                         ldap_back_conn_free( lc );
 531                         rs->sr_err = LDAP_OTHER;
 532                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 533                                 send_ldap_error( op, rs, LDAP_OTHER,
 534                                         "internal server error" );
 535                         }
 536                         return NULL;
 537                 }
 538
 539         } else {
 540                 Debug( LDAP_DEBUG_TRACE,
 541                         "=>ldap_back_getconn: conn %p fetched (refcnt=%u)\n",
 542                         (void *)lc, lc->lc_refcnt, 0 );
 543         }
 544
 545         return lc;
 546 }
 547
 548 void
 549 ldap_back_release_conn(
 550         Operation               *op,
 551         SlapReply               *rs,
 552         struct ldapconn         *lc )
 553 {
 554         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 555
 556 retry_lock:;
 557         switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 558         case LDAP_PVT_THREAD_EBUSY:
 559         default:
 560                 ldap_pvt_thread_yield();
 561                 goto retry_lock;
 562
 563         case 0:
 564                 break;
 565         }
 566
 567         switch ( ldap_pvt_thread_mutex_trylock( &lc->lc_mutex ) ) {
 568         case LDAP_PVT_THREAD_EBUSY:
 569         default:
 570                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 571                 ldap_pvt_thread_yield();
 572                 goto retry_lock;
 573
 574         case 0:
 575                 break;
 576         }
 577
 578         assert( lc->lc_refcnt > 0 );
 579         lc->lc_refcnt--;
 580         ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 581         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 582 }
 583
 584 /*
 585  * ldap_back_dobind
 586  *
 587  * Note: as the check for the value of lc->lc_bound was already here, I removed
 588  * it from all the callers, and I made the function return the flag, so
 589  * it can be used to simplify the check.
 590  *
 591  * Note: lc_mutex is locked; dolock indicates whether li->conn_mutex
 592  * must be locked or not
 593  */
 594 static int
 595 ldap_back_dobind_int(
 596         struct ldapconn         *lc,
 597         Operation               *op,
 598         SlapReply               *rs,
 599         ldap_back_send_t        sendok,
 600         int                     retries,
 601         int                     dolock )
 602 {
 603         int             rc;
 604         ber_int_t       msgid;
 605
 606         assert( retries >= 0 );
 607
 608         if ( !lc->lc_bound ) {
 609                 struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 610
 611                 /*
 612                  * FIXME: we need to let clients use proxyAuthz
 613                  * otherwise we cannot do symmetric pools of servers;
 614                  * we have to live with the fact that a user can
 615                  * authorize itself as any ID that is allowed
 616                  * by the authzTo directive of the "proxyauthzdn".
 617                  */
 618                 /*
 619                  * NOTE: current Proxy Authorization specification
 620                  * and implementation do not allow proxy authorization
 621                  * control to be provided with Bind requests
 622                  */
 623                 /*
 624                  * if no bind took place yet, but the connection is bound
 625                  * and the "idassert-authcDN" (or other ID) is set,
 626                  * then bind as the asserting identity and explicitly
 627                  * add the proxyAuthz control to every operation with the
 628                  * dn bound to the connection as control value.
 629                  * This is done also if this is the authrizing backend,
 630                  * but the "override" flag is given to idassert.
 631                  * It allows to use SASL bind and yet proxyAuthz users
 632                  */
 633                 if ( op->o_conn != NULL &&
 634                                 !op->o_do_not_cache &&
 635                                 ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 636                                   ( li->idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 637                 {
 638                         (void)ldap_back_proxy_authz_bind( lc, op, rs );
 639                         goto done;
 640                 }
 641
 642 #ifdef HAVE_CYRUS_SASL
 643                 if ( lc->lc_ispriv && li->acl_authmethod == LDAP_AUTH_SASL ) {
 644                         void            *defaults = NULL;
 645
 646 #if 1   /* will deal with this later... */
 647                         if ( li->acl_secprops != NULL ) {
 648                                 rc = ldap_set_option( lc->lc_ld,
 649                                         LDAP_OPT_X_SASL_SECPROPS, li->acl_secprops);
 650
 651                                 if( rc != LDAP_OPT_SUCCESS ) {
 652                                         Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 653                                                 "(%s,SECPROPS,\"%s\") failed!\n",
 654                                                 li->url, li->acl_secprops, 0 );
 655                                         goto done;
 656                                 }
 657                         }
 658 #endif
 659
 660                         defaults = lutil_sasl_defaults( lc->lc_ld,
 661                                         li->acl_sasl_mech.bv_val,
 662                                         li->acl_sasl_realm.bv_val,
 663                                         li->acl_authcID.bv_val,
 664                                         li->acl_passwd.bv_val,
 665                                         NULL );
 666
 667                         rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 668                                         li->acl_authcDN.bv_val,
 669                                         li->acl_sasl_mech.bv_val, NULL, NULL,
 670                                         LDAP_SASL_QUIET, lutil_sasl_interact,
 671                                         defaults );
 672
 673                         lutil_sasl_freedefs( defaults );
 674
 675                         rs->sr_err = slap_map_api2result( rs );
 676                         if ( rs->sr_err != LDAP_SUCCESS ) {
 677                                 lc->lc_bound = 0;
 678                                 send_ldap_result( op, rs );
 679
 680                         } else {
 681                                 lc->lc_bound = 1;
 682                         }
 683                         goto done;
 684                 }
 685 #endif /* HAVE_CYRUS_SASL */
 686
 687 retry:;
 688                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 689                                 lc->lc_bound_ndn.bv_val,
 690                                 LDAP_SASL_SIMPLE, &lc->lc_cred,
 691                                 NULL, NULL, &msgid );
 692
 693                 if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 694                         if ( retries > 0 ) {
 695                                 if ( dolock ) {
 696 retry_lock:;
 697                                         switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 698                                         case LDAP_PVT_THREAD_EBUSY:
 699                                         default:
 700                                                 ldap_pvt_thread_yield();
 701                                                 goto retry_lock;
 702
 703                                         case 0:
 704                                                 break;
 705                                         }
 706                                 }
 707
 708                                 assert( lc->lc_refcnt > 0 );
 709                                 if ( lc->lc_refcnt == 1 ) {
 710                                         ldap_unbind_ext_s( lc->lc_ld, NULL, NULL );
 711                                         lc->lc_ld = NULL;
 712
 713                                         /* lc here must be the regular lc, reset and ready for init */
 714                                         rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 715                                 }
 716                                 if ( dolock ) {
 717                                         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 718                                 }
 719                                 if ( rs->sr_err == LDAP_SUCCESS ) {
 720                                         retries--;
 721                                         goto retry;
 722                                 }
 723                         }
 724
 725                         ldap_back_freeconn( op, lc );
 726                         rs->sr_err = slap_map_api2result( rs );
 727
 728                         return 0;
 729                 }
 730
 731                 rc = ldap_back_op_result( lc, op, rs, msgid, sendok );
 732                 if ( rc == LDAP_SUCCESS ) {
 733                         lc->lc_bound = 1;
 734                 }
 735         }
 736
 737 done:;
 738         rc = lc->lc_bound;
 739         return rc;
 740 }
 741
 742 int
 743 ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 744 {
 745         int     rc;
 746
 747         ldap_pvt_thread_mutex_lock( &lc->lc_mutex );
 748         rc = ldap_back_dobind_int( lc, op, rs, sendok, 1, 1 );
 749         ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 750
 751         return rc;
 752 }
 753
 754 /*
 755  * ldap_back_rebind
 756  *
 757  * This is a callback used for chasing referrals using the same
 758  * credentials as the original user on this session.
 759  */
 760 static int
 761 ldap_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 762         ber_int_t msgid, void *params )
 763 {
 764         struct ldapconn *lc = (struct ldapconn *)params;
 765
 766         /* FIXME: add checks on the URL/identity? */
 767
 768         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
 769                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
 770 }
 771
 772 int
 773 ldap_back_op_result(
 774                 struct ldapconn         *lc,
 775                 Operation               *op,
 776                 SlapReply               *rs,
 777                 ber_int_t               msgid,
 778                 ldap_back_send_t        sendok )
 779 {
 780         char            *match = NULL;
 781         LDAPMessage     *res = NULL;
 782         char            *text = NULL;
 783
 784 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 785
 786         rs->sr_text = NULL;
 787         rs->sr_matched = NULL;
 788
 789         /* if the error recorded in the reply corresponds
 790          * to a successful state, get the error from the
 791          * remote server response */
 792         if ( ERR_OK( rs->sr_err ) ) {
 793                 int             rc;
 794                 struct timeval  tv = { 0, 0 };
 795
 796 retry:;
 797                 /* if result parsing fails, note the failure reason */
 798                 switch ( ldap_result( lc->lc_ld, msgid, 1, &tv, &res ) ) {
 799                 case 0:
 800                         tv.tv_sec = 0;
 801                         tv.tv_usec = 100000;    /* 0.1 s */
 802                         ldap_pvt_thread_yield();
 803                         goto retry;
 804
 805                 case -1:
 806                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
 807                                         &rs->sr_err );
 808                         break;
 809
 810
 811                 /* otherwise get the result; if it is not
 812                  * LDAP_SUCCESS, record it in the reply
 813                  * structure (this includes
 814                  * LDAP_COMPARE_{TRUE|FALSE}) */
 815                 default:
 816                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 817                                         &match, &text, NULL, NULL, 1 );
 818                         rs->sr_text = text;
 819                         if ( rc != LDAP_SUCCESS ) {
 820                                 rs->sr_err = rc;
 821                         }
 822                 }
 823         }
 824
 825         /* if the error in the reply structure is not
 826          * LDAP_SUCCESS, try to map it from client
 827          * to server error */
 828         if ( !ERR_OK( rs->sr_err ) ) {
 829                 rs->sr_err = slap_map_api2result( rs );
 830
 831                 /* internal ops ( op->o_conn == NULL )
 832                  * must not reply to client */
 833                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 834
 835                         /* record the (massaged) matched
 836                          * DN into the reply structure */
 837                         rs->sr_matched = match;
 838                 }
 839         }
 840         if ( op->o_conn &&
 841                         ( ( sendok & LDAP_BACK_SENDOK )
 842                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
 843         {
 844                 send_ldap_result( op, rs );
 845         }
 846         if ( match ) {
 847                 if ( rs->sr_matched != match ) {
 848                         free( (char *)rs->sr_matched );
 849                 }
 850                 rs->sr_matched = NULL;
 851                 ldap_memfree( match );
 852         }
 853         if ( text ) {
 854                 ldap_memfree( text );
 855         }
 856         rs->sr_text = NULL;
 857         return( ERR_OK( rs->sr_err ) ? 0 : -1 );
 858 }
 859
 860 /* return true if bound, false if failed */
 861 int
 862 ldap_back_retry( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 863 {
 864         int             rc = 0;
 865         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 866
 867 retry_lock:;
 868         switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 869         case LDAP_PVT_THREAD_EBUSY:
 870         default:
 871                 ldap_pvt_thread_yield();
 872                 goto retry_lock;
 873
 874         case 0:
 875                 break;
 876         }
 877
 878         switch ( ldap_pvt_thread_mutex_trylock( &lc->lc_mutex ) ) {
 879         case LDAP_PVT_THREAD_EBUSY:
 880         default:
 881                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 882                 ldap_pvt_thread_yield();
 883                 goto retry_lock;
 884
 885         case 0:
 886                 break;
 887         }
 888
 889         if ( lc->lc_refcnt == 1 ) {
 890                 ldap_unbind_ext_s( lc->lc_ld, NULL, NULL );
 891                 lc->lc_ld = NULL;
 892                 lc->lc_bound = 0;
 893
 894                 /* lc here must be the regular lc, reset and ready for init */
 895                 rc = ldap_back_prepare_conn( &lc, op, rs, sendok );
 896                 if ( rc == LDAP_SUCCESS ) {
 897                         rc = ldap_back_dobind_int( lc, op, rs, sendok, 0, 0 );
 898                 }
 899         }
 900
 901         ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 902         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 903
 904         return rc;
 905 }
 906
 907 static int
 908 ldap_back_proxy_authz_bind( struct ldapconn *lc, Operation *op, SlapReply *rs )
 909 {
 910         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 911         struct berval   binddn = slap_empty_bv;
 912         struct berval   bindcred = slap_empty_bv;
 913         int             dobind = 0;
 914         int             msgid;
 915         int             rc;
 916
 917         /*
 918          * FIXME: we need to let clients use proxyAuthz
 919          * otherwise we cannot do symmetric pools of servers;
 920          * we have to live with the fact that a user can
 921          * authorize itself as any ID that is allowed
 922          * by the authzTo directive of the "proxyauthzdn".
 923          */
 924         /*
 925          * NOTE: current Proxy Authorization specification
 926          * and implementation do not allow proxy authorization
 927          * control to be provided with Bind requests
 928          */
 929         /*
 930          * if no bind took place yet, but the connection is bound
 931          * and the "proxyauthzdn" is set, then bind as
 932          * "proxyauthzdn" and explicitly add the proxyAuthz
 933          * control to every operation with the dn bound
 934          * to the connection as control value.
 935          */
 936
 937         /* bind as proxyauthzdn only if no idassert mode
 938          * is requested, or if the client's identity
 939          * is authorized */
 940         switch ( li->idassert_mode ) {
 941         case LDAP_BACK_IDASSERT_LEGACY:
 942                 if ( !BER_BVISNULL( &op->o_conn->c_ndn ) && !BER_BVISEMPTY( &op->o_conn->c_ndn ) ) {
 943                         if ( !BER_BVISNULL( &li->idassert_authcDN ) && !BER_BVISEMPTY( &li->idassert_authcDN ) )
 944                         {
 945                                 binddn = li->idassert_authcDN;
 946                                 bindcred = li->idassert_passwd;
 947                                 dobind = 1;
 948                         }
 949                 }
 950                 break;
 951
 952         default:
 953                 /* NOTE: rootdn can always idassert */
 954                 if ( li->idassert_authz && !be_isroot( op ) ) {
 955                         struct berval authcDN;
 956
 957                         if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
 958                                 authcDN = slap_empty_bv;
 959
 960                         } else {
 961                                 authcDN = op->o_conn->c_ndn;
 962                         }
 963                         rs->sr_err = slap_sasl_matches( op, li->idassert_authz,
 964                                         &authcDN, &authcDN );
 965                         if ( rs->sr_err != LDAP_SUCCESS ) {
 966                                 if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
 967                                         send_ldap_result( op, rs );
 968                                         lc->lc_bound = 0;
 969
 970                                 } else {
 971                                         rs->sr_err = LDAP_SUCCESS;
 972                                         binddn = slap_empty_bv;
 973                                         bindcred = slap_empty_bv;
 974                                         break;
 975                                 }
 976
 977                                 goto done;
 978                         }
 979                 }
 980
 981                 binddn = li->idassert_authcDN;
 982                 bindcred = li->idassert_passwd;
 983                 dobind = 1;
 984                 break;
 985         }
 986
 987         if ( dobind && li->idassert_authmethod == LDAP_AUTH_SASL ) {
 988 #ifdef HAVE_CYRUS_SASL
 989                 void            *defaults = NULL;
 990                 struct berval   authzID = BER_BVNULL;
 991                 int             freeauthz = 0;
 992
 993                 /* if SASL supports native authz, prepare for it */
 994                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
 995                                 ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
 996                 {
 997                         switch ( li->idassert_mode ) {
 998                         case LDAP_BACK_IDASSERT_OTHERID:
 999                         case LDAP_BACK_IDASSERT_OTHERDN:
1000                                 authzID = li->idassert_authzID;
1001                                 break;
1002
1003                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1004                                 BER_BVSTR( &authzID, "dn:" );
1005                                 break;
1006
1007                         case LDAP_BACK_IDASSERT_SELF:
1008                                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1009                                         /* connection is not authc'd, so don't idassert */
1010                                         BER_BVSTR( &authzID, "dn:" );
1011                                         break;
1012                                 }
1013                                 authzID.bv_len = STRLENOF( "dn:" ) + op->o_conn->c_ndn.bv_len;
1014                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1015                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1016                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1017                                                 op->o_conn->c_ndn.bv_val, op->o_conn->c_ndn.bv_len + 1 );
1018                                 freeauthz = 1;
1019                                 break;
1020
1021                         default:
1022                                 break;
1023                         }
1024                 }
1025
1026 #if 0   /* will deal with this later... */
1027                 if ( sasl_secprops != NULL ) {
1028                         rs->sr_err = ldap_set_option( lc->lc_ld, LDAP_OPT_X_SASL_SECPROPS,
1029                                 (void *) sasl_secprops );
1030
1031                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1032                                 send_ldap_result( op, rs );
1033                                 lc->lc_bound = 0;
1034                                 goto done;
1035                         }
1036                 }
1037 #endif
1038
1039                 defaults = lutil_sasl_defaults( lc->lc_ld,
1040                                 li->idassert_sasl_mech.bv_val,
1041                                 li->idassert_sasl_realm.bv_val,
1042                                 li->idassert_authcID.bv_val,
1043                                 li->idassert_passwd.bv_val,
1044                                 authzID.bv_val );
1045
1046                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1047                                 li->idassert_sasl_mech.bv_val, NULL, NULL,
1048                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1049                                 defaults );
1050
1051                 lutil_sasl_freedefs( defaults );
1052                 if ( freeauthz ) {
1053                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1054                 }
1055
1056                 rs->sr_err = slap_map_api2result( rs );
1057                 if ( rs->sr_err != LDAP_SUCCESS ) {
1058                         lc->lc_bound = 0;
1059                         send_ldap_result( op, rs );
1060
1061                 } else {
1062                         lc->lc_bound = 1;
1063                 }
1064                 goto done;
1065 #endif /* HAVE_CYRUS_SASL */
1066         }
1067
1068         switch ( li->idassert_authmethod ) {
1069         case LDAP_AUTH_SIMPLE:
1070                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1071                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1072                                 &bindcred, NULL, NULL, &msgid );
1073                 break;
1074
1075         case LDAP_AUTH_NONE:
1076                 lc->lc_bound = 1;
1077                 goto done;
1078
1079         default:
1080                 /* unsupported! */
1081                 lc->lc_bound = 0;
1082                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1083                 send_ldap_result( op, rs );
1084                 goto done;
1085         }
1086
1087         rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_SENDERR );
1088         if ( rc == LDAP_SUCCESS ) {
1089                 lc->lc_bound = 1;
1090         }
1091 done:;
1092         return lc->lc_bound;
1093 }
1094
1095 /*
1096  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1097  * to existing server-side controls if required; if not,
1098  * the existing server-side controls are placed in *pctrls.
1099  * The caller, after using the controls in client API
1100  * operations, if ( *pctrls != op->o_ctrls ), should
1101  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1102  * The function returns success if the control could
1103  * be added if required, or if it did nothing; in the future,
1104  * it might return some error if it failed.
1105  *
1106  * if no bind took place yet, but the connection is bound
1107  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1108  * and explicitly add proxyAuthz the control to every operation
1109  * with the dn bound to the connection as control value.
1110  *
1111  * If no server-side controls are defined for the operation,
1112  * simply add the proxyAuthz control; otherwise, if the
1113  * proxyAuthz control is not already set, add it as
1114  * the first one
1115  *
1116  * FIXME: is controls order significant for security?
1117  * ANSWER: controls ordering and interoperability
1118  * must be indicated by the specs of each control; if none
1119  * is specified, the order is irrelevant.
1120  */
1121 int
1122 ldap_back_proxy_authz_ctrl(
1123                 struct ldapconn *lc,
1124                 Operation       *op,
1125                 SlapReply       *rs,
1126                 LDAPControl     ***pctrls )
1127 {
1128         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
1129         LDAPControl     **ctrls = NULL;
1130         int             i = 0,
1131                         mode;
1132         struct berval   assertedID;
1133
1134         *pctrls = NULL;
1135
1136         rs->sr_err = LDAP_SUCCESS;
1137
1138         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1139          * but if it is not set this test fails.  We need a different
1140          * means to detect if idassert is enabled */
1141         if ( ( BER_BVISNULL( &li->idassert_authcID ) || BER_BVISEMPTY( &li->idassert_authcID ) )
1142                         && ( BER_BVISNULL( &li->idassert_authcDN ) || BER_BVISEMPTY( &li->idassert_authcDN ) ) )
1143         {
1144                 goto done;
1145         }
1146
1147         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1148                 goto done;
1149         }
1150
1151         if ( li->idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1152                 if ( op->o_proxy_authz ) {
1153                         /*
1154                          * FIXME: we do not want to perform proxyAuthz
1155                          * on behalf of the client, because this would
1156                          * be performed with "proxyauthzdn" privileges.
1157                          *
1158                          * This might actually be too strict, since
1159                          * the "proxyauthzdn" authzTo, and each entry's
1160                          * authzFrom attributes may be crafted
1161                          * to avoid unwanted proxyAuthz to take place.
1162                          */
1163 #if 0
1164                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1165                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1166 #endif
1167                         goto done;
1168                 }
1169
1170                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1171                         goto done;
1172                 }
1173
1174                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1175                         goto done;
1176                 }
1177
1178                 if ( BER_BVISNULL( &li->idassert_authcDN ) ) {
1179                         goto done;
1180                 }
1181
1182         } else if ( li->idassert_authmethod == LDAP_AUTH_SASL ) {
1183                 if ( ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1184                                 /* && ( !BER_BVISNULL( &op->o_conn->c_ndn ) || lc->lc_bound ) */ )
1185                 {
1186                         /* already asserted in SASL via native authz */
1187                         /* NOTE: the test on lc->lc_bound is used to trap
1188                          * native authorization of anonymous users,
1189                          * since in that case op->o_conn->c_ndn is NULL */
1190                         goto done;
1191                 }
1192
1193         } else if ( li->idassert_authz && !be_isroot( op ) ) {
1194                 int             rc;
1195                 struct berval authcDN;
1196
1197                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1198                         authcDN = slap_empty_bv;
1199                 } else {
1200                         authcDN = op->o_conn->c_ndn;
1201                 }
1202                 rc = slap_sasl_matches( op, li->idassert_authz,
1203                                 &authcDN, & authcDN );
1204                 if ( rc != LDAP_SUCCESS ) {
1205                         if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1206                         {
1207                                 /* op->o_conn->c_ndn is not authorized
1208                                  * to use idassert */
1209                                 return rc;
1210                         }
1211                         return rs->sr_err;
1212                 }
1213         }
1214
1215         if ( op->o_proxy_authz ) {
1216                 /*
1217                  * FIXME: we can:
1218                  * 1) ignore the already set proxyAuthz control
1219                  * 2) leave it in place, and don't set ours
1220                  * 3) add both
1221                  * 4) reject the operation
1222                  *
1223                  * option (4) is very drastic
1224                  * option (3) will make the remote server reject
1225                  * the operation, thus being equivalent to (4)
1226                  * option (2) will likely break the idassert
1227                  * assumptions, so we cannot accept it;
1228                  * option (1) means that we are contradicting
1229                  * the client's reques.
1230                  *
1231                  * I think (4) is the only correct choice.
1232                  */
1233                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1234                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1235         }
1236
1237         if ( op->o_do_not_cache && op->o_is_auth_check ) {
1238                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1239
1240         } else {
1241                 mode = li->idassert_mode;
1242         }
1243
1244         switch ( mode ) {
1245         case LDAP_BACK_IDASSERT_LEGACY:
1246         case LDAP_BACK_IDASSERT_SELF:
1247                 /* original behavior:
1248                  * assert the client's identity */
1249                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1250                         assertedID = slap_empty_bv;
1251                 } else {
1252                         assertedID = op->o_conn->c_ndn;
1253                 }
1254                 break;
1255
1256         case LDAP_BACK_IDASSERT_ANONYMOUS:
1257                 /* assert "anonymous" */
1258                 assertedID = slap_empty_bv;
1259                 break;
1260
1261         case LDAP_BACK_IDASSERT_NOASSERT:
1262                 /* don't assert; bind as proxyauthzdn */
1263                 goto done;
1264
1265         case LDAP_BACK_IDASSERT_OTHERID:
1266         case LDAP_BACK_IDASSERT_OTHERDN:
1267                 /* assert idassert DN */
1268                 assertedID = li->idassert_authzID;
1269                 break;
1270
1271         default:
1272                 assert( 0 );
1273         }
1274
1275         if ( BER_BVISNULL( &assertedID ) ) {
1276                 assertedID = slap_empty_bv;
1277         }
1278
1279         if ( op->o_ctrls ) {
1280                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1281                         /* just count ctrls */ ;
1282         }
1283
1284         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
1285         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
1286
1287         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1288         ctrls[ 0 ]->ldctl_iscritical = 1;
1289
1290         switch ( li->idassert_mode ) {
1291         /* already in u:ID or dn:DN form */
1292         case LDAP_BACK_IDASSERT_OTHERID:
1293         case LDAP_BACK_IDASSERT_OTHERDN:
1294                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
1295                 break;
1296
1297         /* needs the dn: prefix */
1298         default:
1299                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1300                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
1301                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1302                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1303                                 assertedID.bv_val, assertedID.bv_len + 1 );
1304                 break;
1305         }
1306
1307         if ( op->o_ctrls ) {
1308                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1309                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1310                 }
1311         }
1312         ctrls[ i + 1 ] = NULL;
1313
1314 done:;
1315         if ( ctrls == NULL ) {
1316                 ctrls = op->o_ctrls;
1317         }
1318
1319         *pctrls = ctrls;
1320
1321         return rs->sr_err;
1322 }
1323
1324 int
1325 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1326 {
1327         LDAPControl     **ctrls = *pctrls;
1328
1329         /* we assume that the first control is the proxyAuthz
1330          * added by back-ldap, so it's the only one we explicitly
1331          * free */
1332         if ( ctrls && ctrls != op->o_ctrls ) {
1333                 assert( ctrls[ 0 ] != NULL );
1334
1335                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1336                         free( ctrls[ 0 ]->ldctl_value.bv_val );
1337                 }
1338
1339                 free( ctrls[ 0 ] );
1340                 free( ctrls );
1341         }
1342
1343         *pctrls = NULL;
1344
1345         return 0;
1346 }