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