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                 } else {
 746                         ldap_back_release_conn( op, rs, lc );
 747                 }
 748         }
 749
 750 done:;
 751         rc = lc->lc_bound;
 752         return rc;
 753 }
 754
 755 int
 756 ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 757 {
 758         return ldap_back_dobind_int( lc, op, rs, sendok, 1, 1 );
 759 }
 760
 761 /*
 762  * ldap_back_rebind
 763  *
 764  * This is a callback used for chasing referrals using the same
 765  * credentials as the original user on this session.
 766  */
 767 static int
 768 ldap_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 769         ber_int_t msgid, void *params )
 770 {
 771         struct ldapconn *lc = (struct ldapconn *)params;
 772
 773 #ifdef HAVE_TLS
 774         /* ... otherwise we couldn't get here */
 775         assert( lc != NULL );
 776
 777         if ( !ldap_tls_inplace( ld ) ) {
 778                 int             is_tls = lc->lc_is_tls,
 779                                 rc;
 780                 const char      *text = NULL;
 781
 782                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags, &text );
 783                 if ( rc != LDAP_SUCCESS ) {
 784                         return rc;
 785                 }
 786         }
 787 #endif /* HAVE_TLS */
 788
 789         /* FIXME: add checks on the URL/identity? */
 790
 791         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
 792                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
 793 }
 794
 795 int
 796 ldap_back_op_result(
 797                 struct ldapconn         *lc,
 798                 Operation               *op,
 799                 SlapReply               *rs,
 800                 ber_int_t               msgid,
 801                 ldap_back_send_t        sendok )
 802 {
 803         char            *match = NULL;
 804         LDAPMessage     *res = NULL;
 805         char            *text = NULL;
 806
 807 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 808
 809         rs->sr_text = NULL;
 810         rs->sr_matched = NULL;
 811
 812         /* if the error recorded in the reply corresponds
 813          * to a successful state, get the error from the
 814          * remote server response */
 815         if ( ERR_OK( rs->sr_err ) ) {
 816                 int             rc;
 817                 struct timeval  tv = { 0, 100000 };
 818
 819 retry:;
 820                 /* if result parsing fails, note the failure reason */
 821                 switch ( ldap_result( lc->lc_ld, msgid, 1, &tv, &res ) ) {
 822                 case 0:
 823                         tv.tv_sec = 0;
 824                         tv.tv_usec = 100000;    /* 0.1 s */
 825                         ldap_pvt_thread_yield();
 826                         goto retry;
 827
 828                 case -1:
 829                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
 830                                         &rs->sr_err );
 831                         break;
 832
 833
 834                 /* otherwise get the result; if it is not
 835                  * LDAP_SUCCESS, record it in the reply
 836                  * structure (this includes
 837                  * LDAP_COMPARE_{TRUE|FALSE}) */
 838                 default:
 839                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 840                                         &match, &text, NULL, NULL, 1 );
 841                         rs->sr_text = text;
 842                         if ( rc != LDAP_SUCCESS ) {
 843                                 rs->sr_err = rc;
 844                         }
 845                 }
 846         }
 847
 848         /* if the error in the reply structure is not
 849          * LDAP_SUCCESS, try to map it from client
 850          * to server error */
 851         if ( !ERR_OK( rs->sr_err ) ) {
 852                 rs->sr_err = slap_map_api2result( rs );
 853
 854                 /* internal ops ( op->o_conn == NULL )
 855                  * must not reply to client */
 856                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 857
 858                         /* record the (massaged) matched
 859                          * DN into the reply structure */
 860                         rs->sr_matched = match;
 861                 }
 862         }
 863         if ( op->o_conn &&
 864                         ( ( sendok & LDAP_BACK_SENDOK )
 865                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
 866         {
 867                 send_ldap_result( op, rs );
 868         }
 869         if ( match ) {
 870                 if ( rs->sr_matched != match ) {
 871                         free( (char *)rs->sr_matched );
 872                 }
 873                 rs->sr_matched = NULL;
 874                 ldap_memfree( match );
 875         }
 876         if ( text ) {
 877                 ldap_memfree( text );
 878         }
 879         rs->sr_text = NULL;
 880         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
 881 }
 882
 883 /* return true if bound, false if failed */
 884 int
 885 ldap_back_retry( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 886 {
 887         int             rc = 0;
 888         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 889
 890         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 891
 892         if ( lc->lc_refcnt == 1 ) {
 893                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 894                 lc->lc_ld = NULL;
 895                 lc->lc_bound = 0;
 896
 897                 /* lc here must be the regular lc, reset and ready for init */
 898                 rc = ldap_back_prepare_conn( &lc, op, rs, sendok );
 899                 if ( rc == LDAP_SUCCESS ) {
 900                         rc = ldap_back_dobind_int( lc, op, rs, sendok, 0, 0 );
 901                 }
 902         }
 903
 904         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 905
 906         return rc;
 907 }
 908
 909 static int
 910 ldap_back_proxy_authz_bind( struct ldapconn *lc, Operation *op, SlapReply *rs )
 911 {
 912         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 913         struct berval   binddn = slap_empty_bv;
 914         struct berval   bindcred = slap_empty_bv;
 915         int             dobind = 0;
 916         int             msgid;
 917         int             rc;
 918
 919         /*
 920          * FIXME: we need to let clients use proxyAuthz
 921          * otherwise we cannot do symmetric pools of servers;
 922          * we have to live with the fact that a user can
 923          * authorize itself as any ID that is allowed
 924          * by the authzTo directive of the "proxyauthzdn".
 925          */
 926         /*
 927          * NOTE: current Proxy Authorization specification
 928          * and implementation do not allow proxy authorization
 929          * control to be provided with Bind requests
 930          */
 931         /*
 932          * if no bind took place yet, but the connection is bound
 933          * and the "proxyauthzdn" is set, then bind as
 934          * "proxyauthzdn" and explicitly add the proxyAuthz
 935          * control to every operation with the dn bound
 936          * to the connection as control value.
 937          */
 938
 939         /* bind as proxyauthzdn only if no idassert mode
 940          * is requested, or if the client's identity
 941          * is authorized */
 942         switch ( li->idassert_mode ) {
 943         case LDAP_BACK_IDASSERT_LEGACY:
 944                 if ( !BER_BVISNULL( &op->o_conn->c_ndn ) && !BER_BVISEMPTY( &op->o_conn->c_ndn ) ) {
 945                         if ( !BER_BVISNULL( &li->idassert_authcDN ) && !BER_BVISEMPTY( &li->idassert_authcDN ) )
 946                         {
 947                                 binddn = li->idassert_authcDN;
 948                                 bindcred = li->idassert_passwd;
 949                                 dobind = 1;
 950                         }
 951                 }
 952                 break;
 953
 954         default:
 955                 /* NOTE: rootdn can always idassert */
 956                 if ( li->idassert_authz && !be_isroot( op ) ) {
 957                         struct berval authcDN;
 958
 959                         if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
 960                                 authcDN = slap_empty_bv;
 961
 962                         } else {
 963                                 authcDN = op->o_conn->c_ndn;
 964                         }
 965                         rs->sr_err = slap_sasl_matches( op, li->idassert_authz,
 966                                         &authcDN, &authcDN );
 967                         if ( rs->sr_err != LDAP_SUCCESS ) {
 968                                 if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
 969                                         send_ldap_result( op, rs );
 970                                         lc->lc_bound = 0;
 971
 972                                 } else {
 973                                         rs->sr_err = LDAP_SUCCESS;
 974                                         binddn = slap_empty_bv;
 975                                         bindcred = slap_empty_bv;
 976                                         break;
 977                                 }
 978
 979                                 goto done;
 980                         }
 981                 }
 982
 983                 binddn = li->idassert_authcDN;
 984                 bindcred = li->idassert_passwd;
 985                 dobind = 1;
 986                 break;
 987         }
 988
 989         if ( dobind && li->idassert_authmethod == LDAP_AUTH_SASL ) {
 990 #ifdef HAVE_CYRUS_SASL
 991                 void            *defaults = NULL;
 992                 struct berval   authzID = BER_BVNULL;
 993                 int             freeauthz = 0;
 994
 995                 /* if SASL supports native authz, prepare for it */
 996                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
 997                                 ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
 998                 {
 999                         switch ( li->idassert_mode ) {
1000                         case LDAP_BACK_IDASSERT_OTHERID:
1001                         case LDAP_BACK_IDASSERT_OTHERDN:
1002                                 authzID = li->idassert_authzID;
1003                                 break;
1004
1005                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1006                                 BER_BVSTR( &authzID, "dn:" );
1007                                 break;
1008
1009                         case LDAP_BACK_IDASSERT_SELF:
1010                                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1011                                         /* connection is not authc'd, so don't idassert */
1012                                         BER_BVSTR( &authzID, "dn:" );
1013                                         break;
1014                                 }
1015                                 authzID.bv_len = STRLENOF( "dn:" ) + op->o_conn->c_ndn.bv_len;
1016                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1017                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1018                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1019                                                 op->o_conn->c_ndn.bv_val, op->o_conn->c_ndn.bv_len + 1 );
1020                                 freeauthz = 1;
1021                                 break;
1022
1023                         default:
1024                                 break;
1025                         }
1026                 }
1027
1028 #if 0   /* will deal with this later... */
1029                 if ( sasl_secprops != NULL ) {
1030                         rs->sr_err = ldap_set_option( lc->lc_ld, LDAP_OPT_X_SASL_SECPROPS,
1031                                 (void *) sasl_secprops );
1032
1033                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1034                                 send_ldap_result( op, rs );
1035                                 lc->lc_bound = 0;
1036                                 goto done;
1037                         }
1038                 }
1039 #endif
1040
1041                 defaults = lutil_sasl_defaults( lc->lc_ld,
1042                                 li->idassert_sasl_mech.bv_val,
1043                                 li->idassert_sasl_realm.bv_val,
1044                                 li->idassert_authcID.bv_val,
1045                                 li->idassert_passwd.bv_val,
1046                                 authzID.bv_val );
1047
1048                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1049                                 li->idassert_sasl_mech.bv_val, NULL, NULL,
1050                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1051                                 defaults );
1052
1053                 lutil_sasl_freedefs( defaults );
1054                 if ( freeauthz ) {
1055                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1056                 }
1057
1058                 rs->sr_err = slap_map_api2result( rs );
1059                 if ( rs->sr_err != LDAP_SUCCESS ) {
1060                         lc->lc_bound = 0;
1061                         send_ldap_result( op, rs );
1062
1063                 } else {
1064                         lc->lc_bound = 1;
1065                 }
1066                 goto done;
1067 #endif /* HAVE_CYRUS_SASL */
1068         }
1069
1070         switch ( li->idassert_authmethod ) {
1071         case LDAP_AUTH_SIMPLE:
1072                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1073                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1074                                 &bindcred, NULL, NULL, &msgid );
1075                 break;
1076
1077         case LDAP_AUTH_NONE:
1078                 lc->lc_bound = 1;
1079                 goto done;
1080
1081         default:
1082                 /* unsupported! */
1083                 lc->lc_bound = 0;
1084                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1085                 send_ldap_result( op, rs );
1086                 goto done;
1087         }
1088
1089         rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_SENDERR );
1090         if ( rc == LDAP_SUCCESS ) {
1091                 lc->lc_bound = 1;
1092         }
1093 done:;
1094         return lc->lc_bound;
1095 }
1096
1097 /*
1098  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1099  * to existing server-side controls if required; if not,
1100  * the existing server-side controls are placed in *pctrls.
1101  * The caller, after using the controls in client API
1102  * operations, if ( *pctrls != op->o_ctrls ), should
1103  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1104  * The function returns success if the control could
1105  * be added if required, or if it did nothing; in the future,
1106  * it might return some error if it failed.
1107  *
1108  * if no bind took place yet, but the connection is bound
1109  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1110  * and explicitly add proxyAuthz the control to every operation
1111  * with the dn bound to the connection as control value.
1112  *
1113  * If no server-side controls are defined for the operation,
1114  * simply add the proxyAuthz control; otherwise, if the
1115  * proxyAuthz control is not already set, add it as
1116  * the first one
1117  *
1118  * FIXME: is controls order significant for security?
1119  * ANSWER: controls ordering and interoperability
1120  * must be indicated by the specs of each control; if none
1121  * is specified, the order is irrelevant.
1122  */
1123 int
1124 ldap_back_proxy_authz_ctrl(
1125                 struct ldapconn *lc,
1126                 Operation       *op,
1127                 SlapReply       *rs,
1128                 LDAPControl     ***pctrls )
1129 {
1130         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
1131         LDAPControl     **ctrls = NULL;
1132         int             i = 0,
1133                         mode;
1134         struct berval   assertedID;
1135
1136         *pctrls = NULL;
1137
1138         rs->sr_err = LDAP_SUCCESS;
1139
1140         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1141          * but if it is not set this test fails.  We need a different
1142          * means to detect if idassert is enabled */
1143         if ( ( BER_BVISNULL( &li->idassert_authcID ) || BER_BVISEMPTY( &li->idassert_authcID ) )
1144                         && ( BER_BVISNULL( &li->idassert_authcDN ) || BER_BVISEMPTY( &li->idassert_authcDN ) ) )
1145         {
1146                 goto done;
1147         }
1148
1149         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1150                 goto done;
1151         }
1152
1153         if ( li->idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1154                 if ( op->o_proxy_authz ) {
1155                         /*
1156                          * FIXME: we do not want to perform proxyAuthz
1157                          * on behalf of the client, because this would
1158                          * be performed with "proxyauthzdn" privileges.
1159                          *
1160                          * This might actually be too strict, since
1161                          * the "proxyauthzdn" authzTo, and each entry's
1162                          * authzFrom attributes may be crafted
1163                          * to avoid unwanted proxyAuthz to take place.
1164                          */
1165 #if 0
1166                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1167                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1168 #endif
1169                         goto done;
1170                 }
1171
1172                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1173                         goto done;
1174                 }
1175
1176                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1177                         goto done;
1178                 }
1179
1180                 if ( BER_BVISNULL( &li->idassert_authcDN ) ) {
1181                         goto done;
1182                 }
1183
1184         } else if ( li->idassert_authmethod == LDAP_AUTH_SASL ) {
1185                 if ( ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1186                                 /* && ( !BER_BVISNULL( &op->o_conn->c_ndn ) || lc->lc_bound ) */ )
1187                 {
1188                         /* already asserted in SASL via native authz */
1189                         /* NOTE: the test on lc->lc_bound is used to trap
1190                          * native authorization of anonymous users,
1191                          * since in that case op->o_conn->c_ndn is NULL */
1192                         goto done;
1193                 }
1194
1195         } else if ( li->idassert_authz && !be_isroot( op ) ) {
1196                 int             rc;
1197                 struct berval authcDN;
1198
1199                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1200                         authcDN = slap_empty_bv;
1201                 } else {
1202                         authcDN = op->o_conn->c_ndn;
1203                 }
1204                 rc = slap_sasl_matches( op, li->idassert_authz,
1205                                 &authcDN, & authcDN );
1206                 if ( rc != LDAP_SUCCESS ) {
1207                         if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1208                         {
1209                                 /* op->o_conn->c_ndn is not authorized
1210                                  * to use idassert */
1211                                 return rc;
1212                         }
1213                         return rs->sr_err;
1214                 }
1215         }
1216
1217         if ( op->o_proxy_authz ) {
1218                 /*
1219                  * FIXME: we can:
1220                  * 1) ignore the already set proxyAuthz control
1221                  * 2) leave it in place, and don't set ours
1222                  * 3) add both
1223                  * 4) reject the operation
1224                  *
1225                  * option (4) is very drastic
1226                  * option (3) will make the remote server reject
1227                  * the operation, thus being equivalent to (4)
1228                  * option (2) will likely break the idassert
1229                  * assumptions, so we cannot accept it;
1230                  * option (1) means that we are contradicting
1231                  * the client's reques.
1232                  *
1233                  * I think (4) is the only correct choice.
1234                  */
1235                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1236                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1237         }
1238
1239         if ( op->o_do_not_cache && op->o_is_auth_check ) {
1240                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1241
1242         } else {
1243                 mode = li->idassert_mode;
1244         }
1245
1246         switch ( mode ) {
1247         case LDAP_BACK_IDASSERT_LEGACY:
1248         case LDAP_BACK_IDASSERT_SELF:
1249                 /* original behavior:
1250                  * assert the client's identity */
1251                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1252                         assertedID = slap_empty_bv;
1253                 } else {
1254                         assertedID = op->o_conn->c_ndn;
1255                 }
1256                 break;
1257
1258         case LDAP_BACK_IDASSERT_ANONYMOUS:
1259                 /* assert "anonymous" */
1260                 assertedID = slap_empty_bv;
1261                 break;
1262
1263         case LDAP_BACK_IDASSERT_NOASSERT:
1264                 /* don't assert; bind as proxyauthzdn */
1265                 goto done;
1266
1267         case LDAP_BACK_IDASSERT_OTHERID:
1268         case LDAP_BACK_IDASSERT_OTHERDN:
1269                 /* assert idassert DN */
1270                 assertedID = li->idassert_authzID;
1271                 break;
1272
1273         default:
1274                 assert( 0 );
1275         }
1276
1277         if ( BER_BVISNULL( &assertedID ) ) {
1278                 assertedID = slap_empty_bv;
1279         }
1280
1281         if ( op->o_ctrls ) {
1282                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1283                         /* just count ctrls */ ;
1284         }
1285
1286         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
1287         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
1288
1289         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1290         ctrls[ 0 ]->ldctl_iscritical = 1;
1291
1292         switch ( li->idassert_mode ) {
1293         /* already in u:ID or dn:DN form */
1294         case LDAP_BACK_IDASSERT_OTHERID:
1295         case LDAP_BACK_IDASSERT_OTHERDN:
1296                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
1297                 break;
1298
1299         /* needs the dn: prefix */
1300         default:
1301                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1302                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
1303                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1304                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1305                                 assertedID.bv_val, assertedID.bv_len + 1 );
1306                 break;
1307         }
1308
1309         if ( op->o_ctrls ) {
1310                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1311                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1312                 }
1313         }
1314         ctrls[ i + 1 ] = NULL;
1315
1316 done:;
1317         if ( ctrls == NULL ) {
1318                 ctrls = op->o_ctrls;
1319         }
1320
1321         *pctrls = ctrls;
1322
1323         return rs->sr_err;
1324 }
1325
1326 int
1327 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1328 {
1329         LDAPControl     **ctrls = *pctrls;
1330
1331         /* we assume that the first control is the proxyAuthz
1332          * added by back-ldap, so it's the only one we explicitly
1333          * free */
1334         if ( ctrls && ctrls != op->o_ctrls ) {
1335                 assert( ctrls[ 0 ] != NULL );
1336
1337                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1338                         free( ctrls[ 0 ]->ldctl_value.bv_val );
1339                 }
1340
1341                 free( ctrls[ 0 ] );
1342                 free( ctrls );
1343         }
1344
1345         *pctrls = NULL;
1346
1347         return 0;
1348 }