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

   1 /* bind.c - ldap backend bind function */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 1999-2005 The OpenLDAP Foundation.
   6  * Portions Copyright 2000-2003 Pierangelo Masarati.
   7  * Portions Copyright 1999-2003 Howard Chu.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted only as authorized by the OpenLDAP
  12  * Public License.
  13  *
  14  * A copy of this license is available in the file LICENSE in the
  15  * top-level directory of the distribution or, alternatively, at
  16  * <http://www.OpenLDAP.org/license.html>.
  17  */
  18 /* ACKNOWLEDGEMENTS:
  19  * This work was initially developed by Howard Chu for inclusion
  20  * in OpenLDAP Software and subsequently enhanced by Pierangelo
  21  * Masarati.
  22  */
  23
  24 #include "portable.h"
  25
  26 #include <stdio.h>
  27
  28 #include <ac/errno.h>
  29 #include <ac/socket.h>
  30 #include <ac/string.h>
  31
  32 #define AVL_INTERNAL
  33 #include "slap.h"
  34 #include "back-ldap.h"
  35
  36 #include <lutil_ldap.h>
  37
  38 #define PRINT_CONNTREE 0
  39
  40 static LDAP_REBIND_PROC ldap_back_rebind;
  41
  42 static int
  43 ldap_back_proxy_authz_bind( struct ldapconn *lc, Operation *op, SlapReply *rs );
  44
  45 static int
  46 ldap_back_prepare_conn( struct ldapconn **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  47
  48 int
  49 ldap_back_bind( Operation *op, SlapReply *rs )
  50 {
  51         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
  52         struct ldapconn *lc;
  53
  54         int rc = 0;
  55         ber_int_t msgid;
  56
  57         lc = ldap_back_getconn( op, rs, LDAP_BACK_SENDERR );
  58         if ( !lc ) {
  59                 return rs->sr_err;
  60         }
  61
  62         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
  63                 ch_free( lc->lc_bound_ndn.bv_val );
  64                 BER_BVZERO( &lc->lc_bound_ndn );
  65         }
  66         lc->lc_bound = 0;
  67
  68         /* method is always LDAP_AUTH_SIMPLE if we got here */
  69         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
  70                         LDAP_SASL_SIMPLE,
  71                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
  72         rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_SENDERR );
  73
  74         if ( rc == LDAP_SUCCESS ) {
  75                 /* If defined, proxyAuthz will be used also when
  76                  * back-ldap is the authorizing backend; for this
  77                  * purpose, a successful bind is followed by a
  78                  * bind with the configured identity assertion */
  79                 /* NOTE: use with care */
  80                 if ( li->idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
  81                         ldap_back_proxy_authz_bind( lc, op, rs );
  82                         if ( lc->lc_bound == 0 ) {
  83                                 rc = 1;
  84                                 goto done;
  85                         }
  86                 }
  87
  88                 lc->lc_bound = 1;
  89                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
  90
  91                 if ( LDAP_BACK_SAVECRED( li ) ) {
  92                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
  93                                 memset( lc->lc_cred.bv_val, 0,
  94                                                 lc->lc_cred.bv_len );
  95                         }
  96                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
  97                         ldap_set_rebind_proc( lc->lc_ld, ldap_back_rebind, lc );
  98                 }
  99         }
 100 done:;
 101
 102         /* must re-insert if local DN changed as result of bind */
 103         if ( lc->lc_bound && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) {
 104                 int             lerr;
 105
 106                 /* wait for all other ops to release the connection */
 107 retry_lock:;
 108                 switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
 109                 case LDAP_PVT_THREAD_EBUSY:
 110                 default:
 111                         ldap_pvt_thread_yield();
 112                         goto retry_lock;
 113
 114                 case 0:
 115                         if ( lc->lc_refcnt > 1 ) {
 116                                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 117                                 ldap_pvt_thread_yield();
 118                                 goto retry_lock;
 119                         }
 120                         break;
 121                 }
 122
 123                 assert( lc->lc_refcnt == 1 );
 124                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 125                                 ldap_back_conn_cmp );
 126                 assert( lc != NULL );
 127
 128                 ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 129                 lerr = avl_insert( &li->conntree, (caddr_t)lc,
 130                         ldap_back_conn_cmp, ldap_back_conn_dup );
 131                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 132                 if ( lerr == -1 ) {
 133                         /* we can do this because lc_refcnt == 1 */
 134                         ldap_back_conn_free( lc );
 135                         lc = NULL;
 136                 }
 137         }
 138
 139         if ( lc != NULL ) {
 140                 ldap_back_release_conn( op, rs, lc );
 141         }
 142
 143         return( rc );
 144 }
 145
 146 /*
 147  * ldap_back_conn_cmp
 148  *
 149  * compares two struct ldapconn based on the value of the conn pointer;
 150  * used by avl stuff
 151  */
 152 int
 153 ldap_back_conn_cmp( const void *c1, const void *c2 )
 154 {
 155         const struct ldapconn *lc1 = (const struct ldapconn *)c1;
 156         const struct ldapconn *lc2 = (const struct ldapconn *)c2;
 157         int rc;
 158
 159         /* If local DNs don't match, it is definitely not a match */
 160         rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 161         if ( rc ) {
 162                 return rc;
 163         }
 164
 165         /* For shared sessions, conn is NULL. Only explicitly
 166          * bound sessions will have non-NULL conn.
 167          */
 168         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 169 }
 170
 171 /*
 172  * ldap_back_conn_dup
 173  *
 174  * returns -1 in case a duplicate struct ldapconn has been inserted;
 175  * used by avl stuff
 176  */
 177 int
 178 ldap_back_conn_dup( void *c1, void *c2 )
 179 {
 180         struct ldapconn *lc1 = (struct ldapconn *)c1;
 181         struct ldapconn *lc2 = (struct ldapconn *)c2;
 182
 183         /* Cannot have more than one shared session with same DN */
 184         if ( dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) &&
 185                         lc1->lc_conn == lc2->lc_conn )
 186         {
 187                 return -1;
 188         }
 189
 190         return 0;
 191 }
 192
 193 #if PRINT_CONNTREE > 0
 194 static void
 195 ravl_print( Avlnode *root, int depth )
 196 {
 197         int     i;
 198         struct ldapconn *lc;
 199
 200         if ( root == 0 ) {
 201                 return;
 202         }
 203
 204         ravl_print( root->avl_right, depth+1 );
 205
 206         for ( i = 0; i < depth; i++ ) {
 207                 printf( "   " );
 208         }
 209
 210         lc = root->avl_data;
 211         printf( "lc(%lx) local(%s) conn(%lx) %d\n",
 212                         lc, lc->lc_local_ndn.bv_val, lc->lc_conn, root->avl_bf );
 213
 214         ravl_print( root->avl_left, depth+1 );
 215 }
 216
 217 static void
 218 myprint( Avlnode *root )
 219 {
 220         printf( "********\n" );
 221
 222         if ( root == 0 ) {
 223                 printf( "\tNULL\n" );
 224
 225         } else {
 226                 ravl_print( root, 0 );
 227         }
 228
 229         printf( "********\n" );
 230 }
 231 #endif /* PRINT_CONNTREE */
 232
 233 int
 234 ldap_back_freeconn( Operation *op, struct ldapconn *lc )
 235 {
 236         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
 237
 238         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 239
 240         assert( lc->lc_refcnt > 0 );
 241         if ( --lc->lc_refcnt == 0 ) {
 242                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 243                                 ldap_back_conn_cmp );
 244                 assert( lc != NULL );
 245
 246                 ldap_back_conn_free( (void *)lc );
 247         }
 248
 249         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 250
 251         return 0;
 252 }
 253
 254 #ifdef HAVE_TLS
 255 static int
 256 ldap_back_start_tls(
 257         LDAP            *ld,
 258         int             protocol,
 259         int             *is_tls,
 260         const char      *url,
 261         unsigned        flags,
 262         const char      **text )
 263 {
 264         int             rc = LDAP_SUCCESS;
 265         struct ldapinfo li;
 266
 267         /* this is ridicolous... */
 268         li.flags = flags;
 269
 270         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 271         if ( ( LDAP_BACK_USE_TLS( &li ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &li ) ) )
 272                                 && !ldap_is_ldaps_url( url ) )
 273         {
 274 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 275                 /*
 276                  * use asynchronous StartTLS
 277                  * in case, chase referral (not implemented yet)
 278                  */
 279                 int             msgid;
 280
 281                 if ( protocol == 0 ) {
 282                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 283                                         (void *)&protocol );
 284                 }
 285
 286                 if ( protocol < LDAP_VERSION3 ) {
 287                         protocol = LDAP_VERSION3;
 288                         /* Set LDAP version */
 289                         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 290                                         (const void *)&protocol );
 291                 }
 292
 293                 rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 294                 if ( rc == LDAP_SUCCESS ) {
 295                         LDAPMessage     *res = NULL;
 296                         int             retries = 1;
 297                         struct timeval  tv = { 0, 0 };
 298
 299 retry:;
 300                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 301                         if ( rc < 0 ) {
 302                                 rc = LDAP_OTHER;
 303
 304                         } else if ( rc == 0 ) {
 305                                 if ( retries ) {
 306                                         retries--;
 307                                         tv.tv_sec = 0;
 308                                         tv.tv_usec = 100000;
 309                                         goto retry;
 310                                 }
 311                                 rc = LDAP_OTHER;
 312
 313                         } else if ( rc == LDAP_RES_EXTENDED ) {
 314                                 struct berval   *data = NULL;
 315
 316                                 rc = ldap_parse_extended_result( ld, res,
 317                                                 NULL, &data, 0 );
 318                                 if ( rc == LDAP_SUCCESS ) {
 319                                         rc = ldap_result2error( ld, res, 1 );
 320                                         res = NULL;
 321
 322                                         /* FIXME: in case a referral
 323                                          * is returned, should we try
 324                                          * using it instead of the
 325                                          * configured URI? */
 326                                         if ( rc == LDAP_SUCCESS ) {
 327                                                 rc = ldap_install_tls( ld );
 328
 329                                         } else if ( rc == LDAP_REFERRAL ) {
 330                                                 rc = LDAP_OTHER;
 331                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 332                                         }
 333
 334                                         if ( data ) {
 335                                                 if ( data->bv_val ) {
 336                                                         ber_memfree( data->bv_val );
 337                                                 }
 338                                                 ber_memfree( data );
 339                                         }
 340                                 }
 341
 342                         } else {
 343                                 rc = LDAP_OTHER;
 344                         }
 345
 346                         if ( res != NULL ) {
 347                                 ldap_msgfree( res );
 348                         }
 349                 }
 350 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 351                 /*
 352                  * use synchronous StartTLS
 353                  */
 354                 rc = ldap_start_tls_s( ld, NULL, NULL );
 355 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 356
 357                 /* if StartTLS is requested, only attempt it if the URL
 358                  * is not "ldaps://"; this may occur not only in case
 359                  * of misconfiguration, but also when used in the chain
 360                  * overlay, where the "uri" can be parsed out of a referral */
 361                 switch ( rc ) {
 362                 case LDAP_SUCCESS:
 363                         *is_tls = 1;
 364                         break;
 365
 366                 case LDAP_SERVER_DOWN:
 367                         break;
 368
 369                 default:
 370                         if ( LDAP_BACK_TLS_CRITICAL( &li ) ) {
 371                                 *text = "could not start TLS";
 372                                 break;
 373                         }
 374
 375                         /* in case Start TLS is not critical */
 376                         *is_tls = 0;
 377                         rc = LDAP_SUCCESS;
 378                         break;
 379                 }
 380
 381         } else {
 382                 *is_tls = 0;
 383         }
 384
 385         return rc;
 386 }
 387 #endif /* HAVE_TLS */
 388
 389 static int
 390 ldap_back_prepare_conn( struct ldapconn **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 391 {
 392         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 393         int             vers = op->o_protocol;
 394         LDAP            *ld = NULL;
 395 #ifdef HAVE_TLS
 396         int             is_tls = op->o_conn->c_is_tls;
 397 #endif /* HAVE_TLS */
 398
 399         assert( lcp != NULL );
 400
 401         rs->sr_err = ldap_initialize( &ld, li->url );
 402         if ( rs->sr_err != LDAP_SUCCESS ) {
 403                 goto error_return;
 404         }
 405
 406         /* Set LDAP version. This will always succeed: If the client
 407          * bound with a particular version, then so can we.
 408          */
 409         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&vers );
 410
 411         /* automatically chase referrals ("[dont-]chase-referrals" statement) */
 412         if ( LDAP_BACK_CHASE_REFERRALS( li ) ) {
 413                 ldap_set_option( ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON );
 414         }
 415
 416 #ifdef HAVE_TLS
 417         rs->sr_err = ldap_back_start_tls( ld,
 418                         op->o_protocol, &is_tls,
 419                         li->url, li->flags, &rs->sr_text );
 420         if ( rs->sr_err != LDAP_SUCCESS ) {
 421                 ldap_unbind_ext( ld, NULL, NULL );
 422                 goto error_return;
 423         }
 424 #endif /* HAVE_TLS */
 425
 426         if ( *lcp == NULL ) {
 427                 *lcp = (struct ldapconn *)ch_calloc( 1, sizeof( struct ldapconn ) );
 428                 (*lcp)->lc_flags= li->flags;
 429         }
 430         (*lcp)->lc_ld = ld;
 431         (*lcp)->lc_refcnt = 1;
 432 #ifdef HAVE_TLS
 433         (*lcp)->lc_is_tls = is_tls;
 434 #endif /* HAVE_TLS */
 435
 436 error_return:;
 437         if ( rs->sr_err != LDAP_SUCCESS ) {
 438                 rs->sr_err = slap_map_api2result( rs );
 439                 if ( sendok & LDAP_BACK_SENDERR ) {
 440                         if ( rs->sr_text == NULL ) {
 441                                 rs->sr_text = "ldap_initialize() failed";
 442                         }
 443                         send_ldap_result( op, rs );
 444                         rs->sr_text = NULL;
 445                 }
 446         }
 447
 448         return rs->sr_err;
 449 }
 450
 451 struct ldapconn *
 452 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 453 {
 454         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 455         struct ldapconn *lc,
 456                         lc_curr = { 0 };
 457         int             refcnt = 1;
 458
 459         /* Searches for a ldapconn in the avl tree */
 460
 461         /* Explicit binds must not be shared */
 462         if ( op->o_tag == LDAP_REQ_BIND
 463                 || ( op->o_conn
 464                         && op->o_conn->c_authz_backend
 465                         && op->o_bd->be_private == op->o_conn->c_authz_backend->be_private ) )
 466         {
 467                 lc_curr.lc_conn = op->o_conn;
 468
 469         } else {
 470 #ifdef HAVE_TLS
 471                 if ( op->o_conn->c_is_tls ) {
 472                         lc_curr.lc_conn = LDAP_BACK_PRIV_CONN_TLS;
 473                 } else
 474 #endif /* HAVE_TLS */
 475                 {
 476                         lc_curr.lc_conn = LDAP_BACK_PRIV_CONN;
 477                 }
 478         }
 479
 480         /* Internal searches are privileged and shared. So is root. */
 481         /* FIXME: there seem to be concurrency issues */
 482         if ( op->o_do_not_cache || be_isroot( op ) ) {
 483                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 484 #ifdef HAVE_TLS
 485                 if ( op->o_conn->c_is_tls ) {
 486                         lc_curr.lc_conn = LDAP_BACK_PRIV_CONN_TLS;
 487                 } else
 488 #endif /* HAVE_TLS */
 489                 {
 490                         lc_curr.lc_conn = LDAP_BACK_PRIV_CONN;
 491                 }
 492                 lc_curr.lc_ispriv = 1;
 493
 494         } else {
 495                 lc_curr.lc_local_ndn = op->o_ndn;
 496         }
 497
 498         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 499
 500         lc = (struct ldapconn *)avl_find( li->conntree,
 501                         (caddr_t)&lc_curr, ldap_back_conn_cmp );
 502         if ( lc != NULL ) {
 503                 refcnt = ++lc->lc_refcnt;
 504         }
 505         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 506
 507         /* Looks like we didn't get a bind. Open a new session... */
 508         if ( lc == NULL ) {
 509                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 510                         return NULL;
 511                 }
 512
 513                 lc->lc_conn = lc_curr.lc_conn;
 514                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 515
 516                 if ( lc_curr.lc_ispriv ) {
 517                         ber_dupbv( &lc->lc_cred, &li->acl_passwd );
 518                         ber_dupbv( &lc->lc_bound_ndn, &li->acl_authcDN );
 519                         lc->lc_ispriv = lc_curr.lc_ispriv;
 520
 521                 } else {
 522                         BER_BVZERO( &lc->lc_cred );
 523                         BER_BVZERO( &lc->lc_bound_ndn );
 524                         if ( op->o_conn && !BER_BVISEMPTY( &op->o_ndn )
 525                                 && op->o_bd->be_private == op->o_conn->c_authz_backend->be_private )
 526                         {
 527                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 528                         }
 529                 }
 530
 531 #ifdef HAVE_TLS
 532                 /* if start TLS failed but it was not mandatory,
 533                  * check if the non-TLS connection was already
 534                  * in cache; in case, destroy the newly created
 535                  * connection and use the existing one */
 536                 if ( lc->lc_conn == LDAP_BACK_PRIV_CONN_TLS
 537                                 && !ldap_tls_inplace( lc->lc_ld ) )
 538                 {
 539                         struct ldapconn *tmplc;
 540
 541                         lc_curr.lc_conn = LDAP_BACK_PRIV_CONN;
 542                         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 543                         tmplc = (struct ldapconn *)avl_find( li->conntree,
 544                                         (caddr_t)&lc_curr, ldap_back_conn_cmp );
 545                         if ( tmplc != NULL ) {
 546                                 refcnt = ++tmplc->lc_refcnt;
 547                                 ldap_back_conn_free( lc );
 548                                 lc = tmplc;
 549                         }
 550                         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 551
 552                         if ( tmplc != NULL ) {
 553                                 goto done;
 554                         }
 555                 }
 556 #endif /* HAVE_TLS */
 557
 558                 lc->lc_bound = 0;
 559
 560                 /* Inserts the newly created ldapconn in the avl tree */
 561                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 562
 563                 assert( lc->lc_refcnt == 1 );
 564                 rs->sr_err = avl_insert( &li->conntree, (caddr_t)lc,
 565                         ldap_back_conn_cmp, ldap_back_conn_dup );
 566
 567 #if PRINT_CONNTREE > 0
 568                 myprint( li->conntree );
 569 #endif /* PRINT_CONNTREE */
 570
 571                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 572
 573                 Debug( LDAP_DEBUG_TRACE,
 574                         "=>ldap_back_getconn: conn %p inserted (refcnt=%u)\n",
 575                         (void *)lc, refcnt, 0 );
 576
 577                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 578                 if ( rs->sr_err != 0 ) {
 579                         ldap_back_conn_free( lc );
 580                         rs->sr_err = LDAP_OTHER;
 581                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 582                                 send_ldap_error( op, rs, LDAP_OTHER,
 583                                         "internal server error" );
 584                         }
 585                         return NULL;
 586                 }
 587
 588         } else {
 589                 Debug( LDAP_DEBUG_TRACE,
 590                         "=>ldap_back_getconn: conn %p fetched (refcnt=%u)\n",
 591                         (void *)lc, refcnt, 0 );
 592         }
 593
 594 done:;
 595         return lc;
 596 }
 597
 598 void
 599 ldap_back_release_conn(
 600         Operation               *op,
 601         SlapReply               *rs,
 602         struct ldapconn         *lc )
 603 {
 604         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 605
 606         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 607         assert( lc->lc_refcnt > 0 );
 608         lc->lc_refcnt--;
 609         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 610 }
 611
 612 /*
 613  * ldap_back_dobind
 614  *
 615  * Note: as the check for the value of lc->lc_bound was already here, I removed
 616  * it from all the callers, and I made the function return the flag, so
 617  * it can be used to simplify the check.
 618  *
 619  * Note: dolock indicates whether li->conn_mutex must be locked or not
 620  */
 621 static int
 622 ldap_back_dobind_int(
 623         struct ldapconn         *lc,
 624         Operation               *op,
 625         SlapReply               *rs,
 626         ldap_back_send_t        sendok,
 627         int                     retries,
 628         int                     dolock )
 629 {
 630         int             rc;
 631         ber_int_t       msgid;
 632
 633         assert( retries >= 0 );
 634
 635         if ( !lc->lc_bound ) {
 636                 struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 637
 638                 /*
 639                  * FIXME: we need to let clients use proxyAuthz
 640                  * otherwise we cannot do symmetric pools of servers;
 641                  * we have to live with the fact that a user can
 642                  * authorize itself as any ID that is allowed
 643                  * by the authzTo directive of the "proxyauthzdn".
 644                  */
 645                 /*
 646                  * NOTE: current Proxy Authorization specification
 647                  * and implementation do not allow proxy authorization
 648                  * control to be provided with Bind requests
 649                  */
 650                 /*
 651                  * if no bind took place yet, but the connection is bound
 652                  * and the "idassert-authcDN" (or other ID) is set,
 653                  * then bind as the asserting identity and explicitly
 654                  * add the proxyAuthz control to every operation with the
 655                  * dn bound to the connection as control value.
 656                  * This is done also if this is the authrizing backend,
 657                  * but the "override" flag is given to idassert.
 658                  * It allows to use SASL bind and yet proxyAuthz users
 659                  */
 660                 if ( op->o_conn != NULL &&
 661                                 !op->o_do_not_cache &&
 662                                 ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 663                                   ( li->idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 664                 {
 665                         (void)ldap_back_proxy_authz_bind( lc, op, rs );
 666                         goto done;
 667                 }
 668
 669 #ifdef HAVE_CYRUS_SASL
 670                 if ( lc->lc_ispriv && li->acl_authmethod == LDAP_AUTH_SASL ) {
 671                         void            *defaults = NULL;
 672
 673 #if 1   /* will deal with this later... */
 674                         if ( li->acl_secprops != NULL ) {
 675                                 rc = ldap_set_option( lc->lc_ld,
 676                                         LDAP_OPT_X_SASL_SECPROPS, li->acl_secprops);
 677
 678                                 if( rc != LDAP_OPT_SUCCESS ) {
 679                                         Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 680                                                 "(%s,SECPROPS,\"%s\") failed!\n",
 681                                                 li->url, li->acl_secprops, 0 );
 682                                         goto done;
 683                                 }
 684                         }
 685 #endif
 686
 687                         defaults = lutil_sasl_defaults( lc->lc_ld,
 688                                         li->acl_sasl_mech.bv_val,
 689                                         li->acl_sasl_realm.bv_val,
 690                                         li->acl_authcID.bv_val,
 691                                         li->acl_passwd.bv_val,
 692                                         NULL );
 693
 694                         rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 695                                         li->acl_authcDN.bv_val,
 696                                         li->acl_sasl_mech.bv_val, NULL, NULL,
 697                                         LDAP_SASL_QUIET, lutil_sasl_interact,
 698                                         defaults );
 699
 700                         lutil_sasl_freedefs( defaults );
 701
 702                         rs->sr_err = slap_map_api2result( rs );
 703                         if ( rs->sr_err != LDAP_SUCCESS ) {
 704                                 lc->lc_bound = 0;
 705                                 send_ldap_result( op, rs );
 706
 707                         } else {
 708                                 lc->lc_bound = 1;
 709                         }
 710                         goto done;
 711                 }
 712 #endif /* HAVE_CYRUS_SASL */
 713
 714 retry:;
 715                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 716                                 lc->lc_bound_ndn.bv_val,
 717                                 LDAP_SASL_SIMPLE, &lc->lc_cred,
 718                                 NULL, NULL, &msgid );
 719
 720                 if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 721                         if ( retries > 0 ) {
 722                                 if ( dolock ) {
 723                                         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 724                                 }
 725
 726                                 assert( lc->lc_refcnt > 0 );
 727                                 if ( lc->lc_refcnt == 1 ) {
 728                                         ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 729                                         lc->lc_ld = NULL;
 730
 731                                         /* lc here must be the regular lc, reset and ready for init */
 732                                         rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 733                                 }
 734                                 if ( dolock ) {
 735                                         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 736                                 }
 737                                 if ( rs->sr_err == LDAP_SUCCESS ) {
 738                                         retries--;
 739                                         goto retry;
 740                                 }
 741                         }
 742
 743                         ldap_back_freeconn( op, lc );
 744                         rs->sr_err = slap_map_api2result( rs );
 745
 746                         return 0;
 747                 }
 748
 749                 rc = ldap_back_op_result( lc, op, rs, msgid, sendok );
 750                 if ( rc == LDAP_SUCCESS ) {
 751                         lc->lc_bound = 1;
 752                 }
 753         }
 754
 755 done:;
 756         rc = lc->lc_bound;
 757         return rc;
 758 }
 759
 760 int
 761 ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 762 {
 763         return ldap_back_dobind_int( lc, op, rs, sendok, 1, 1 );
 764 }
 765
 766 /*
 767  * ldap_back_rebind
 768  *
 769  * This is a callback used for chasing referrals using the same
 770  * credentials as the original user on this session.
 771  */
 772 static int
 773 ldap_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 774         ber_int_t msgid, void *params )
 775 {
 776         struct ldapconn *lc = (struct ldapconn *)params;
 777
 778 #ifdef HAVE_TLS
 779         /* ... otherwise we couldn't get here */
 780         assert( lc != NULL );
 781
 782         if ( !ldap_tls_inplace( ld ) ) {
 783                 int             is_tls = lc->lc_is_tls,
 784                                 rc;
 785                 const char      *text = NULL;
 786
 787                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags, &text );
 788                 if ( rc != LDAP_SUCCESS ) {
 789                         return rc;
 790                 }
 791         }
 792 #endif /* HAVE_TLS */
 793
 794         /* FIXME: add checks on the URL/identity? */
 795
 796         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
 797                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
 798 }
 799
 800 int
 801 ldap_back_op_result(
 802                 struct ldapconn         *lc,
 803                 Operation               *op,
 804                 SlapReply               *rs,
 805                 ber_int_t               msgid,
 806                 ldap_back_send_t        sendok )
 807 {
 808         char            *match = NULL;
 809         LDAPMessage     *res = NULL;
 810         char            *text = NULL;
 811
 812 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 813
 814         rs->sr_text = NULL;
 815         rs->sr_matched = NULL;
 816
 817         /* if the error recorded in the reply corresponds
 818          * to a successful state, get the error from the
 819          * remote server response */
 820         if ( ERR_OK( rs->sr_err ) ) {
 821                 int             rc;
 822                 struct timeval  tv = { 0, 0 };
 823
 824 retry:;
 825                 /* if result parsing fails, note the failure reason */
 826                 switch ( ldap_result( lc->lc_ld, msgid, 1, &tv, &res ) ) {
 827                 case 0:
 828                         tv.tv_sec = 0;
 829                         tv.tv_usec = 100000;    /* 0.1 s */
 830                         ldap_pvt_thread_yield();
 831                         goto retry;
 832
 833                 case -1:
 834                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
 835                                         &rs->sr_err );
 836                         break;
 837
 838
 839                 /* otherwise get the result; if it is not
 840                  * LDAP_SUCCESS, record it in the reply
 841                  * structure (this includes
 842                  * LDAP_COMPARE_{TRUE|FALSE}) */
 843                 default:
 844                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 845                                         &match, &text, NULL, NULL, 1 );
 846                         rs->sr_text = text;
 847                         if ( rc != LDAP_SUCCESS ) {
 848                                 rs->sr_err = rc;
 849                         }
 850                 }
 851         }
 852
 853         /* if the error in the reply structure is not
 854          * LDAP_SUCCESS, try to map it from client
 855          * to server error */
 856         if ( !ERR_OK( rs->sr_err ) ) {
 857                 rs->sr_err = slap_map_api2result( rs );
 858
 859                 /* internal ops ( op->o_conn == NULL )
 860                  * must not reply to client */
 861                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 862
 863                         /* record the (massaged) matched
 864                          * DN into the reply structure */
 865                         rs->sr_matched = match;
 866                 }
 867         }
 868         if ( op->o_conn &&
 869                         ( ( sendok & LDAP_BACK_SENDOK )
 870                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
 871         {
 872                 send_ldap_result( op, rs );
 873         }
 874         if ( match ) {
 875                 if ( rs->sr_matched != match ) {
 876                         free( (char *)rs->sr_matched );
 877                 }
 878                 rs->sr_matched = NULL;
 879                 ldap_memfree( match );
 880         }
 881         if ( text ) {
 882                 ldap_memfree( text );
 883         }
 884         rs->sr_text = NULL;
 885         return( ERR_OK( rs->sr_err ) ? 0 : -1 );
 886 }
 887
 888 /* return true if bound, false if failed */
 889 int
 890 ldap_back_retry( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 891 {
 892         int             rc = 0;
 893         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 894
 895         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 896
 897         if ( lc->lc_refcnt == 1 ) {
 898                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 899                 lc->lc_ld = NULL;
 900                 lc->lc_bound = 0;
 901
 902                 /* lc here must be the regular lc, reset and ready for init */
 903                 rc = ldap_back_prepare_conn( &lc, op, rs, sendok );
 904                 if ( rc == LDAP_SUCCESS ) {
 905                         rc = ldap_back_dobind_int( lc, op, rs, sendok, 0, 0 );
 906                 }
 907         }
 908
 909         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 910
 911         return rc;
 912 }
 913
 914 static int
 915 ldap_back_proxy_authz_bind( struct ldapconn *lc, Operation *op, SlapReply *rs )
 916 {
 917         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 918         struct berval   binddn = slap_empty_bv;
 919         struct berval   bindcred = slap_empty_bv;
 920         int             dobind = 0;
 921         int             msgid;
 922         int             rc;
 923
 924         /*
 925          * FIXME: we need to let clients use proxyAuthz
 926          * otherwise we cannot do symmetric pools of servers;
 927          * we have to live with the fact that a user can
 928          * authorize itself as any ID that is allowed
 929          * by the authzTo directive of the "proxyauthzdn".
 930          */
 931         /*
 932          * NOTE: current Proxy Authorization specification
 933          * and implementation do not allow proxy authorization
 934          * control to be provided with Bind requests
 935          */
 936         /*
 937          * if no bind took place yet, but the connection is bound
 938          * and the "proxyauthzdn" is set, then bind as
 939          * "proxyauthzdn" and explicitly add the proxyAuthz
 940          * control to every operation with the dn bound
 941          * to the connection as control value.
 942          */
 943
 944         /* bind as proxyauthzdn only if no idassert mode
 945          * is requested, or if the client's identity
 946          * is authorized */
 947         switch ( li->idassert_mode ) {
 948         case LDAP_BACK_IDASSERT_LEGACY:
 949                 if ( !BER_BVISNULL( &op->o_conn->c_ndn ) && !BER_BVISEMPTY( &op->o_conn->c_ndn ) ) {
 950                         if ( !BER_BVISNULL( &li->idassert_authcDN ) && !BER_BVISEMPTY( &li->idassert_authcDN ) )
 951                         {
 952                                 binddn = li->idassert_authcDN;
 953                                 bindcred = li->idassert_passwd;
 954                                 dobind = 1;
 955                         }
 956                 }
 957                 break;
 958
 959         default:
 960                 /* NOTE: rootdn can always idassert */
 961                 if ( li->idassert_authz && !be_isroot( op ) ) {
 962                         struct berval authcDN;
 963
 964                         if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
 965                                 authcDN = slap_empty_bv;
 966
 967                         } else {
 968                                 authcDN = op->o_conn->c_ndn;
 969                         }
 970                         rs->sr_err = slap_sasl_matches( op, li->idassert_authz,
 971                                         &authcDN, &authcDN );
 972                         if ( rs->sr_err != LDAP_SUCCESS ) {
 973                                 if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
 974                                         send_ldap_result( op, rs );
 975                                         lc->lc_bound = 0;
 976
 977                                 } else {
 978                                         rs->sr_err = LDAP_SUCCESS;
 979                                         binddn = slap_empty_bv;
 980                                         bindcred = slap_empty_bv;
 981                                         break;
 982                                 }
 983
 984                                 goto done;
 985                         }
 986                 }
 987
 988                 binddn = li->idassert_authcDN;
 989                 bindcred = li->idassert_passwd;
 990                 dobind = 1;
 991                 break;
 992         }
 993
 994         if ( dobind && li->idassert_authmethod == LDAP_AUTH_SASL ) {
 995 #ifdef HAVE_CYRUS_SASL
 996                 void            *defaults = NULL;
 997                 struct berval   authzID = BER_BVNULL;
 998                 int             freeauthz = 0;
 999
1000                 /* if SASL supports native authz, prepare for it */
1001                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1002                                 ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1003                 {
1004                         switch ( li->idassert_mode ) {
1005                         case LDAP_BACK_IDASSERT_OTHERID:
1006                         case LDAP_BACK_IDASSERT_OTHERDN:
1007                                 authzID = li->idassert_authzID;
1008                                 break;
1009
1010                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1011                                 BER_BVSTR( &authzID, "dn:" );
1012                                 break;
1013
1014                         case LDAP_BACK_IDASSERT_SELF:
1015                                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1016                                         /* connection is not authc'd, so don't idassert */
1017                                         BER_BVSTR( &authzID, "dn:" );
1018                                         break;
1019                                 }
1020                                 authzID.bv_len = STRLENOF( "dn:" ) + op->o_conn->c_ndn.bv_len;
1021                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1022                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1023                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1024                                                 op->o_conn->c_ndn.bv_val, op->o_conn->c_ndn.bv_len + 1 );
1025                                 freeauthz = 1;
1026                                 break;
1027
1028                         default:
1029                                 break;
1030                         }
1031                 }
1032
1033 #if 0   /* will deal with this later... */
1034                 if ( sasl_secprops != NULL ) {
1035                         rs->sr_err = ldap_set_option( lc->lc_ld, LDAP_OPT_X_SASL_SECPROPS,
1036                                 (void *) sasl_secprops );
1037
1038                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1039                                 send_ldap_result( op, rs );
1040                                 lc->lc_bound = 0;
1041                                 goto done;
1042                         }
1043                 }
1044 #endif
1045
1046                 defaults = lutil_sasl_defaults( lc->lc_ld,
1047                                 li->idassert_sasl_mech.bv_val,
1048                                 li->idassert_sasl_realm.bv_val,
1049                                 li->idassert_authcID.bv_val,
1050                                 li->idassert_passwd.bv_val,
1051                                 authzID.bv_val );
1052
1053                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1054                                 li->idassert_sasl_mech.bv_val, NULL, NULL,
1055                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1056                                 defaults );
1057
1058                 lutil_sasl_freedefs( defaults );
1059                 if ( freeauthz ) {
1060                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1061                 }
1062
1063                 rs->sr_err = slap_map_api2result( rs );
1064                 if ( rs->sr_err != LDAP_SUCCESS ) {
1065                         lc->lc_bound = 0;
1066                         send_ldap_result( op, rs );
1067
1068                 } else {
1069                         lc->lc_bound = 1;
1070                 }
1071                 goto done;
1072 #endif /* HAVE_CYRUS_SASL */
1073         }
1074
1075         switch ( li->idassert_authmethod ) {
1076         case LDAP_AUTH_SIMPLE:
1077                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1078                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1079                                 &bindcred, NULL, NULL, &msgid );
1080                 break;
1081
1082         case LDAP_AUTH_NONE:
1083                 lc->lc_bound = 1;
1084                 goto done;
1085
1086         default:
1087                 /* unsupported! */
1088                 lc->lc_bound = 0;
1089                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1090                 send_ldap_result( op, rs );
1091                 goto done;
1092         }
1093
1094         rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_SENDERR );
1095         if ( rc == LDAP_SUCCESS ) {
1096                 lc->lc_bound = 1;
1097         }
1098 done:;
1099         return lc->lc_bound;
1100 }
1101
1102 /*
1103  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1104  * to existing server-side controls if required; if not,
1105  * the existing server-side controls are placed in *pctrls.
1106  * The caller, after using the controls in client API
1107  * operations, if ( *pctrls != op->o_ctrls ), should
1108  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1109  * The function returns success if the control could
1110  * be added if required, or if it did nothing; in the future,
1111  * it might return some error if it failed.
1112  *
1113  * if no bind took place yet, but the connection is bound
1114  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1115  * and explicitly add proxyAuthz the control to every operation
1116  * with the dn bound to the connection as control value.
1117  *
1118  * If no server-side controls are defined for the operation,
1119  * simply add the proxyAuthz control; otherwise, if the
1120  * proxyAuthz control is not already set, add it as
1121  * the first one
1122  *
1123  * FIXME: is controls order significant for security?
1124  * ANSWER: controls ordering and interoperability
1125  * must be indicated by the specs of each control; if none
1126  * is specified, the order is irrelevant.
1127  */
1128 int
1129 ldap_back_proxy_authz_ctrl(
1130                 struct ldapconn *lc,
1131                 Operation       *op,
1132                 SlapReply       *rs,
1133                 LDAPControl     ***pctrls )
1134 {
1135         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
1136         LDAPControl     **ctrls = NULL;
1137         int             i = 0,
1138                         mode;
1139         struct berval   assertedID;
1140
1141         *pctrls = NULL;
1142
1143         rs->sr_err = LDAP_SUCCESS;
1144
1145         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1146          * but if it is not set this test fails.  We need a different
1147          * means to detect if idassert is enabled */
1148         if ( ( BER_BVISNULL( &li->idassert_authcID ) || BER_BVISEMPTY( &li->idassert_authcID ) )
1149                         && ( BER_BVISNULL( &li->idassert_authcDN ) || BER_BVISEMPTY( &li->idassert_authcDN ) ) )
1150         {
1151                 goto done;
1152         }
1153
1154         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1155                 goto done;
1156         }
1157
1158         if ( li->idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1159                 if ( op->o_proxy_authz ) {
1160                         /*
1161                          * FIXME: we do not want to perform proxyAuthz
1162                          * on behalf of the client, because this would
1163                          * be performed with "proxyauthzdn" privileges.
1164                          *
1165                          * This might actually be too strict, since
1166                          * the "proxyauthzdn" authzTo, and each entry's
1167                          * authzFrom attributes may be crafted
1168                          * to avoid unwanted proxyAuthz to take place.
1169                          */
1170 #if 0
1171                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1172                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1173 #endif
1174                         goto done;
1175                 }
1176
1177                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1178                         goto done;
1179                 }
1180
1181                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1182                         goto done;
1183                 }
1184
1185                 if ( BER_BVISNULL( &li->idassert_authcDN ) ) {
1186                         goto done;
1187                 }
1188
1189         } else if ( li->idassert_authmethod == LDAP_AUTH_SASL ) {
1190                 if ( ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1191                                 /* && ( !BER_BVISNULL( &op->o_conn->c_ndn ) || lc->lc_bound ) */ )
1192                 {
1193                         /* already asserted in SASL via native authz */
1194                         /* NOTE: the test on lc->lc_bound is used to trap
1195                          * native authorization of anonymous users,
1196                          * since in that case op->o_conn->c_ndn is NULL */
1197                         goto done;
1198                 }
1199
1200         } else if ( li->idassert_authz && !be_isroot( op ) ) {
1201                 int             rc;
1202                 struct berval authcDN;
1203
1204                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1205                         authcDN = slap_empty_bv;
1206                 } else {
1207                         authcDN = op->o_conn->c_ndn;
1208                 }
1209                 rc = slap_sasl_matches( op, li->idassert_authz,
1210                                 &authcDN, & authcDN );
1211                 if ( rc != LDAP_SUCCESS ) {
1212                         if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1213                         {
1214                                 /* op->o_conn->c_ndn is not authorized
1215                                  * to use idassert */
1216                                 return rc;
1217                         }
1218                         return rs->sr_err;
1219                 }
1220         }
1221
1222         if ( op->o_proxy_authz ) {
1223                 /*
1224                  * FIXME: we can:
1225                  * 1) ignore the already set proxyAuthz control
1226                  * 2) leave it in place, and don't set ours
1227                  * 3) add both
1228                  * 4) reject the operation
1229                  *
1230                  * option (4) is very drastic
1231                  * option (3) will make the remote server reject
1232                  * the operation, thus being equivalent to (4)
1233                  * option (2) will likely break the idassert
1234                  * assumptions, so we cannot accept it;
1235                  * option (1) means that we are contradicting
1236                  * the client's reques.
1237                  *
1238                  * I think (4) is the only correct choice.
1239                  */
1240                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1241                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1242         }
1243
1244         if ( op->o_do_not_cache && op->o_is_auth_check ) {
1245                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1246
1247         } else {
1248                 mode = li->idassert_mode;
1249         }
1250
1251         switch ( mode ) {
1252         case LDAP_BACK_IDASSERT_LEGACY:
1253         case LDAP_BACK_IDASSERT_SELF:
1254                 /* original behavior:
1255                  * assert the client's identity */
1256                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1257                         assertedID = slap_empty_bv;
1258                 } else {
1259                         assertedID = op->o_conn->c_ndn;
1260                 }
1261                 break;
1262
1263         case LDAP_BACK_IDASSERT_ANONYMOUS:
1264                 /* assert "anonymous" */
1265                 assertedID = slap_empty_bv;
1266                 break;
1267
1268         case LDAP_BACK_IDASSERT_NOASSERT:
1269                 /* don't assert; bind as proxyauthzdn */
1270                 goto done;
1271
1272         case LDAP_BACK_IDASSERT_OTHERID:
1273         case LDAP_BACK_IDASSERT_OTHERDN:
1274                 /* assert idassert DN */
1275                 assertedID = li->idassert_authzID;
1276                 break;
1277
1278         default:
1279                 assert( 0 );
1280         }
1281
1282         if ( BER_BVISNULL( &assertedID ) ) {
1283                 assertedID = slap_empty_bv;
1284         }
1285
1286         if ( op->o_ctrls ) {
1287                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1288                         /* just count ctrls */ ;
1289         }
1290
1291         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
1292         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
1293
1294         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1295         ctrls[ 0 ]->ldctl_iscritical = 1;
1296
1297         switch ( li->idassert_mode ) {
1298         /* already in u:ID or dn:DN form */
1299         case LDAP_BACK_IDASSERT_OTHERID:
1300         case LDAP_BACK_IDASSERT_OTHERDN:
1301                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
1302                 break;
1303
1304         /* needs the dn: prefix */
1305         default:
1306                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1307                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
1308                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1309                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1310                                 assertedID.bv_val, assertedID.bv_len + 1 );
1311                 break;
1312         }
1313
1314         if ( op->o_ctrls ) {
1315                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1316                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1317                 }
1318         }
1319         ctrls[ i + 1 ] = NULL;
1320
1321 done:;
1322         if ( ctrls == NULL ) {
1323                 ctrls = op->o_ctrls;
1324         }
1325
1326         *pctrls = ctrls;
1327
1328         return rs->sr_err;
1329 }
1330
1331 int
1332 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1333 {
1334         LDAPControl     **ctrls = *pctrls;
1335
1336         /* we assume that the first control is the proxyAuthz
1337          * added by back-ldap, so it's the only one we explicitly
1338          * free */
1339         if ( ctrls && ctrls != op->o_ctrls ) {
1340                 assert( ctrls[ 0 ] != NULL );
1341
1342                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1343                         free( ctrls[ 0 ]->ldctl_value.bv_val );
1344                 }
1345
1346                 free( ctrls[ 0 ] );
1347                 free( ctrls );
1348         }
1349
1350         *pctrls = NULL;
1351
1352         return 0;
1353 }