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 1999-2006 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_default_rebind;
  41
  42 LDAP_REBIND_PROC        *ldap_back_rebind_f = ldap_back_default_rebind;
  43
  44 static int
  45 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs );
  46
  47 static int
  48 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  49
  50 int
  51 ldap_back_bind( Operation *op, SlapReply *rs )
  52 {
  53         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
  54         ldapconn_t      *lc;
  55
  56         int rc = 0;
  57         ber_int_t msgid;
  58
  59         lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR );
  60         if ( !lc ) {
  61                 return rs->sr_err;
  62         }
  63
  64         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
  65                 ch_free( lc->lc_bound_ndn.bv_val );
  66                 BER_BVZERO( &lc->lc_bound_ndn );
  67         }
  68         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
  69
  70         /* method is always LDAP_AUTH_SIMPLE if we got here */
  71         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
  72                         LDAP_SASL_SIMPLE,
  73                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
  74         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
  75
  76         if ( rc == LDAP_SUCCESS ) {
  77                 /* If defined, proxyAuthz will be used also when
  78                  * back-ldap is the authorizing backend; for this
  79                  * purpose, a successful bind is followed by a
  80                  * bind with the configured identity assertion */
  81                 /* NOTE: use with care */
  82                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
  83                         ldap_back_proxy_authz_bind( lc, op, rs );
  84                         if ( !LDAP_BACK_CONN_ISBOUND( lc ) ) {
  85                                 rc = 1;
  86                                 goto done;
  87                         }
  88                 }
  89
  90                 LDAP_BACK_CONN_ISBOUND_SET( lc );
  91                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
  92
  93                 if ( LDAP_BACK_SAVECRED( li ) ) {
  94                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
  95                                 memset( lc->lc_cred.bv_val, 0,
  96                                                 lc->lc_cred.bv_len );
  97                         }
  98                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
  99                         ldap_set_rebind_proc( lc->lc_ld, ldap_back_rebind_f, lc );
 100                 }
 101         }
 102 done:;
 103
 104         /* must re-insert if local DN changed as result of bind */
 105         if ( LDAP_BACK_CONN_ISBOUND( lc )
 106                 && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) )
 107         {
 108                 int             lerr;
 109
 110                 /* wait for all other ops to release the connection */
 111 retry_lock:;
 112                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 113                 if ( lc->lc_refcnt > 1 ) {
 114                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 115                         ldap_pvt_thread_yield();
 116                         goto retry_lock;
 117                 }
 118
 119                 assert( lc->lc_refcnt == 1 );
 120                 lc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 121                                 ldap_back_conn_cmp );
 122                 assert( lc != NULL );
 123
 124                 ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 125                 lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 126                         ldap_back_conn_cmp, ldap_back_conn_dup );
 127                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 128                 if ( lerr == -1 ) {
 129                         /* we can do this because lc_refcnt == 1 */
 130                         ldap_back_conn_free( lc );
 131                         lc = NULL;
 132                 }
 133         }
 134
 135         if ( lc != NULL ) {
 136                 ldap_back_release_conn( op, rs, lc );
 137         }
 138
 139         return( rc );
 140 }
 141
 142 /*
 143  * ldap_back_conn_cmp
 144  *
 145  * compares two ldapconn_t based on the value of the conn pointer;
 146  * used by avl stuff
 147  */
 148 int
 149 ldap_back_conn_cmp( const void *c1, const void *c2 )
 150 {
 151         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 152         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 153         int rc;
 154
 155         /* If local DNs don't match, it is definitely not a match */
 156         rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 157         if ( rc ) {
 158                 return rc;
 159         }
 160
 161         /* For shared sessions, conn is NULL. Only explicitly
 162          * bound sessions will have non-NULL conn.
 163          */
 164         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 165 }
 166
 167 /*
 168  * ldap_back_conn_dup
 169  *
 170  * returns -1 in case a duplicate ldapconn_t has been inserted;
 171  * used by avl stuff
 172  */
 173 int
 174 ldap_back_conn_dup( void *c1, void *c2 )
 175 {
 176         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 177         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 178
 179         /* Cannot have more than one shared session with same DN */
 180         if ( dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) &&
 181                         lc1->lc_conn == lc2->lc_conn )
 182         {
 183                 return -1;
 184         }
 185
 186         return 0;
 187 }
 188
 189 #if PRINT_CONNTREE > 0
 190 static void
 191 ravl_print( Avlnode *root, int depth )
 192 {
 193         int             i;
 194         ldapconn_t      *lc;
 195
 196         if ( root == 0 ) {
 197                 return;
 198         }
 199
 200         ravl_print( root->avl_right, depth+1 );
 201
 202         for ( i = 0; i < depth; i++ ) {
 203                 printf( "   " );
 204         }
 205
 206         lc = root->avl_data;
 207         printf( "lc(%lx) local(%s) conn(%lx) %d\n",
 208                         lc, lc->lc_local_ndn.bv_val, lc->lc_conn, root->avl_bf );
 209
 210         ravl_print( root->avl_left, depth+1 );
 211 }
 212
 213 static void
 214 myprint( Avlnode *root )
 215 {
 216         printf( "********\n" );
 217
 218         if ( root == 0 ) {
 219                 printf( "\tNULL\n" );
 220
 221         } else {
 222                 ravl_print( root, 0 );
 223         }
 224
 225         printf( "********\n" );
 226 }
 227 #endif /* PRINT_CONNTREE */
 228
 229 int
 230 ldap_back_freeconn( Operation *op, ldapconn_t *lc, int dolock )
 231 {
 232         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 233
 234         if ( dolock ) {
 235                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 236         }
 237
 238         assert( lc->lc_refcnt > 0 );
 239         if ( --lc->lc_refcnt == 0 ) {
 240                 lc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 241                                 ldap_back_conn_cmp );
 242                 assert( lc != NULL );
 243
 244                 ldap_back_conn_free( (void *)lc );
 245         }
 246
 247         if ( dolock ) {
 248                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 249         }
 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         int             retries,
 263         const char      **text )
 264 {
 265         int             rc = LDAP_SUCCESS;
 266         ldapinfo_t      dummy;
 267
 268         /* this is ridiculous... */
 269         dummy.li_flags = flags;
 270
 271         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 272         if ( ( LDAP_BACK_USE_TLS( &dummy ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &dummy ) ) )
 273                                 && !ldap_is_ldaps_url( url ) )
 274         {
 275 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 276                 /*
 277                  * use asynchronous StartTLS
 278                  * in case, chase referral (not implemented yet)
 279                  */
 280                 int             msgid;
 281
 282                 if ( protocol == 0 ) {
 283                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 284                                         (void *)&protocol );
 285                 }
 286
 287                 if ( protocol < LDAP_VERSION3 ) {
 288                         protocol = LDAP_VERSION3;
 289                         /* Set LDAP version */
 290                         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 291                                         (const void *)&protocol );
 292                 }
 293
 294                 rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 295                 if ( rc == LDAP_SUCCESS ) {
 296                         LDAPMessage     *res = NULL;
 297                         struct timeval  tv;
 298
 299                         LDAP_BACK_TV_SET( &tv );
 300
 301 retry:;
 302                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 303                         if ( rc < 0 ) {
 304                                 rc = LDAP_UNAVAILABLE;
 305
 306                         } else if ( rc == 0 ) {
 307                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 308                                         ldap_pvt_thread_yield();
 309                                         if ( retries > 0 ) {
 310                                                 retries--;
 311                                         }
 312                                         LDAP_BACK_TV_SET( &tv );
 313                                         goto retry;
 314                                 }
 315                                 rc = LDAP_UNAVAILABLE;
 316
 317                         } else if ( rc == LDAP_RES_EXTENDED ) {
 318                                 struct berval   *data = NULL;
 319
 320                                 rc = ldap_parse_extended_result( ld, res,
 321                                                 NULL, &data, 0 );
 322                                 if ( rc == LDAP_SUCCESS ) {
 323                                         int err;
 324                                         rc = ldap_parse_result( ld, res, &err,
 325                                                 NULL, NULL, NULL, NULL, 1 );
 326                                         if ( rc == LDAP_SUCCESS ) {
 327                                                 rc = err;
 328                                         }
 329                                         res = NULL;
 330
 331                                         /* FIXME: in case a referral
 332                                          * is returned, should we try
 333                                          * using it instead of the
 334                                          * configured URI? */
 335                                         if ( rc == LDAP_SUCCESS ) {
 336                                                 rc = ldap_install_tls( ld );
 337
 338                                         } else if ( rc == LDAP_REFERRAL ) {
 339                                                 rc = LDAP_UNWILLING_TO_PERFORM;
 340                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 341                                         }
 342
 343                                         if ( data ) {
 344                                                 if ( data->bv_val ) {
 345                                                         ber_memfree( data->bv_val );
 346                                                 }
 347                                                 ber_memfree( data );
 348                                         }
 349                                 }
 350
 351                         } else {
 352                                 rc = LDAP_OTHER;
 353                         }
 354
 355                         if ( res != NULL ) {
 356                                 ldap_msgfree( res );
 357                         }
 358                 }
 359 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 360                 /*
 361                  * use synchronous StartTLS
 362                  */
 363                 rc = ldap_start_tls_s( ld, NULL, NULL );
 364 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 365
 366                 /* if StartTLS is requested, only attempt it if the URL
 367                  * is not "ldaps://"; this may occur not only in case
 368                  * of misconfiguration, but also when used in the chain
 369                  * overlay, where the "uri" can be parsed out of a referral */
 370                 switch ( rc ) {
 371                 case LDAP_SUCCESS:
 372                         *is_tls = 1;
 373                         break;
 374
 375                 case LDAP_SERVER_DOWN:
 376                         break;
 377
 378                 default:
 379                         if ( LDAP_BACK_TLS_CRITICAL( &dummy ) ) {
 380                                 *text = "could not start TLS";
 381                                 break;
 382                         }
 383
 384                         /* in case Start TLS is not critical */
 385                         *is_tls = 0;
 386                         rc = LDAP_SUCCESS;
 387                         break;
 388                 }
 389
 390         } else {
 391                 *is_tls = 0;
 392         }
 393
 394         return rc;
 395 }
 396 #endif /* HAVE_TLS */
 397
 398 static int
 399 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 400 {
 401         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 402         int             vers = op->o_protocol;
 403         LDAP            *ld = NULL;
 404 #ifdef HAVE_TLS
 405         int             is_tls = op->o_conn->c_is_tls;
 406 #endif /* HAVE_TLS */
 407
 408         assert( lcp != NULL );
 409
 410         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 411         if ( rs->sr_err != LDAP_SUCCESS ) {
 412                 goto error_return;
 413         }
 414
 415         /* Set LDAP version. This will always succeed: If the client
 416          * bound with a particular version, then so can we.
 417          */
 418         if ( vers == 0 ) {
 419                 /* assume it's an internal op; set to LDAPv3 */
 420                 vers = LDAP_VERSION3;
 421         }
 422         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&vers );
 423
 424         /* automatically chase referrals ("[dont-]chase-referrals" statement) */
 425         if ( LDAP_BACK_CHASE_REFERRALS( li ) ) {
 426                 ldap_set_option( ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON );
 427         }
 428
 429 #ifdef HAVE_TLS
 430         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 431                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 432         if ( rs->sr_err != LDAP_SUCCESS ) {
 433                 ldap_unbind_ext( ld, NULL, NULL );
 434                 goto error_return;
 435         }
 436 #endif /* HAVE_TLS */
 437
 438         if ( *lcp == NULL ) {
 439                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 440                 (*lcp)->lc_flags= li->li_flags;
 441         }
 442         (*lcp)->lc_ld = ld;
 443         (*lcp)->lc_refcnt = 1;
 444 #ifdef HAVE_TLS
 445         if ( is_tls ) {
 446                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 447         } else {
 448                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 449         }
 450 #endif /* HAVE_TLS */
 451
 452 error_return:;
 453         if ( rs->sr_err != LDAP_SUCCESS ) {
 454                 rs->sr_err = slap_map_api2result( rs );
 455                 if ( sendok & LDAP_BACK_SENDERR ) {
 456                         if ( rs->sr_text == NULL ) {
 457                                 rs->sr_text = "ldap_initialize() failed";
 458                         }
 459                         send_ldap_result( op, rs );
 460                         rs->sr_text = NULL;
 461                 }
 462         }
 463
 464         return rs->sr_err;
 465 }
 466
 467 ldapconn_t *
 468 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 469 {
 470         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 471         ldapconn_t      *lc,
 472                         lc_curr = { 0 };
 473         int             refcnt = 1;
 474
 475         /* Internal searches are privileged and shared. So is root. */
 476         if ( op->o_do_not_cache || be_isroot( op ) ) {
 477                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 478                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 479                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 480
 481         } else {
 482                 lc_curr.lc_local_ndn = op->o_ndn;
 483                 /* Explicit binds must not be shared */
 484                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 485                         lc_curr.lc_conn = op->o_conn;
 486
 487                 } else {
 488                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 489                 }
 490         }
 491
 492         /* Explicit Bind requests always get their own conn */
 493         if ( sendok & LDAP_BACK_BINDING ) {
 494                 lc = NULL;
 495         } else {
 496                 /* Searches for a ldapconn in the avl tree */
 497 retry_lock:
 498                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 499
 500                 lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 501                                 (caddr_t)&lc_curr, ldap_back_conn_cmp );
 502                 if ( lc != NULL ) {
 503                         refcnt = ++lc->lc_refcnt;
 504                         /* Don't reuse connections while they're still binding */
 505                         if ( LDAP_BACK_CONN_BINDING( lc )) {
 506                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 507                                 ldap_pvt_thread_yield();
 508                                 goto retry_lock;
 509                         }
 510                 }
 511                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 512         }
 513
 514         /* Looks like we didn't get a bind. Open a new session... */
 515         if ( lc == NULL ) {
 516                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 517                         return NULL;
 518                 }
 519                 if ( sendok & LDAP_BACK_BINDING )
 520                         LDAP_BACK_CONN_BINDING_SET( lc );
 521
 522                 lc->lc_conn = lc_curr.lc_conn;
 523                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 524
 525                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 526                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 527                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 528                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 529
 530                 } else {
 531                         BER_BVZERO( &lc->lc_cred );
 532                         BER_BVZERO( &lc->lc_bound_ndn );
 533 #if 0
 534                         /* FIXME: if we set lc_bound_ndn = o_ndn
 535                          * we end up with a bind with DN but no password! */
 536                         if ( !BER_BVISEMPTY( &op->o_ndn )
 537                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 538                         {
 539                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 540                         }
 541 #endif
 542                 }
 543
 544 #ifdef HAVE_TLS
 545                 /* if start TLS failed but it was not mandatory,
 546                  * check if the non-TLS connection was already
 547                  * in cache; in case, destroy the newly created
 548                  * connection and use the existing one */
 549                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 550                                 && !ldap_tls_inplace( lc->lc_ld ) )
 551                 {
 552                         ldapconn_t *tmplc;
 553
 554                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 555                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 556                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 557                                         (caddr_t)&lc_curr, ldap_back_conn_cmp );
 558                         if ( tmplc != NULL ) {
 559                                 refcnt = ++tmplc->lc_refcnt;
 560                                 ldap_back_conn_free( lc );
 561                                 lc = tmplc;
 562                         }
 563                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 564
 565                         if ( tmplc != NULL ) {
 566                                 goto done;
 567                         }
 568                 }
 569 #endif /* HAVE_TLS */
 570
 571                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 572
 573                 /* Inserts the newly created ldapconn in the avl tree */
 574                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 575
 576                 assert( lc->lc_refcnt == 1 );
 577                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 578                         ldap_back_conn_cmp, ldap_back_conn_dup );
 579
 580 #if PRINT_CONNTREE > 0
 581                 myprint( li->li_conninfo.lai_tree );
 582 #endif /* PRINT_CONNTREE */
 583
 584                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 585
 586                 Debug( LDAP_DEBUG_TRACE,
 587                         "=>ldap_back_getconn: conn %p inserted (refcnt=%u)\n",
 588                         (void *)lc, refcnt, 0 );
 589
 590                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 591                 if ( rs->sr_err != 0 ) {
 592                         ldap_back_conn_free( lc );
 593                         rs->sr_err = LDAP_OTHER;
 594                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 595                                 send_ldap_error( op, rs, LDAP_OTHER,
 596                                         "internal server error" );
 597                         }
 598                         return NULL;
 599                 }
 600
 601         } else {
 602                 if ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout ) {
 603                         /* in case of failure, it frees/taints lc and sets it to NULL */
 604                         if ( ldap_back_retry( &lc, op, rs, sendok ) ) {
 605                                 lc = NULL;
 606                         }
 607                 }
 608
 609                 if ( lc ) {
 610                         Debug( LDAP_DEBUG_TRACE,
 611                                 "=>ldap_back_getconn: conn %p fetched (refcnt=%u)\n",
 612                                 (void *)lc, refcnt, 0 );
 613                 }
 614         }
 615
 616         if ( li->li_idle_timeout && lc ) {
 617                 lc->lc_time = op->o_time;
 618         }
 619
 620 done:;
 621         return lc;
 622 }
 623
 624 void
 625 ldap_back_release_conn(
 626         Operation               *op,
 627         SlapReply               *rs,
 628         ldapconn_t              *lc )
 629 {
 630         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 631
 632         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 633         assert( lc->lc_refcnt > 0 );
 634         lc->lc_refcnt--;
 635         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 636         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 637 }
 638
 639 /*
 640  * ldap_back_dobind
 641  *
 642  * Note: as the check for the value of lc->lc_bound was already here, I removed
 643  * it from all the callers, and I made the function return the flag, so
 644  * it can be used to simplify the check.
 645  *
 646  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 647  */
 648 static int
 649 ldap_back_dobind_int(
 650         ldapconn_t              *lc,
 651         Operation               *op,
 652         SlapReply               *rs,
 653         ldap_back_send_t        sendok,
 654         int                     retries,
 655         int                     dolock )
 656 {
 657         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 658
 659         int             rc = LDAP_BACK_CONN_ISBOUND( lc );
 660         ber_int_t       msgid;
 661
 662         assert( retries >= 0 );
 663
 664         if ( rc ) {
 665                 return rc;
 666         }
 667
 668         while ( lc->lc_refcnt > 1 ) {
 669                 ldap_pvt_thread_yield();
 670                 if (( rc = LDAP_BACK_CONN_ISBOUND( lc )))
 671                         return rc;
 672         }
 673
 674         /*
 675          * FIXME: we need to let clients use proxyAuthz
 676          * otherwise we cannot do symmetric pools of servers;
 677          * we have to live with the fact that a user can
 678          * authorize itself as any ID that is allowed
 679          * by the authzTo directive of the "proxyauthzdn".
 680          */
 681         /*
 682          * NOTE: current Proxy Authorization specification
 683          * and implementation do not allow proxy authorization
 684          * control to be provided with Bind requests
 685          */
 686         /*
 687          * if no bind took place yet, but the connection is bound
 688          * and the "idassert-authcDN" (or other ID) is set,
 689          * then bind as the asserting identity and explicitly
 690          * add the proxyAuthz control to every operation with the
 691          * dn bound to the connection as control value.
 692          * This is done also if this is the authrizing backend,
 693          * but the "override" flag is given to idassert.
 694          * It allows to use SASL bind and yet proxyAuthz users
 695          */
 696         if ( op->o_conn != NULL &&
 697                         !op->o_do_not_cache &&
 698                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 699                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 700         {
 701                 (void)ldap_back_proxy_authz_bind( lc, op, rs );
 702                 goto done;
 703         }
 704
 705 #ifdef HAVE_CYRUS_SASL
 706         if ( LDAP_BACK_CONN_ISPRIV( lc )
 707                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 708         {
 709                 void            *defaults = NULL;
 710
 711                 if ( li->li_acl_secprops != NULL ) {
 712                         rc = ldap_set_option( lc->lc_ld,
 713                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 714
 715                         if ( rc != LDAP_OPT_SUCCESS ) {
 716                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 717                                         "(%s,SECPROPS,\"%s\") failed!\n",
 718                                         li->li_uri, li->li_acl_secprops, 0 );
 719                                 goto done;
 720                         }
 721                 }
 722
 723                 defaults = lutil_sasl_defaults( lc->lc_ld,
 724                                 li->li_acl_sasl_mech.bv_val,
 725                                 li->li_acl_sasl_realm.bv_val,
 726                                 li->li_acl_authcID.bv_val,
 727                                 li->li_acl_passwd.bv_val,
 728                                 NULL );
 729
 730                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 731                                 li->li_acl_authcDN.bv_val,
 732                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 733                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 734                                 defaults );
 735
 736                 lutil_sasl_freedefs( defaults );
 737
 738                 rs->sr_err = slap_map_api2result( rs );
 739                 if ( rs->sr_err != LDAP_SUCCESS ) {
 740                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 741                         send_ldap_result( op, rs );
 742
 743                 } else {
 744                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 745                 }
 746                 goto done;
 747         }
 748 #endif /* HAVE_CYRUS_SASL */
 749
 750 retry:;
 751         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 752                         lc->lc_bound_ndn.bv_val,
 753                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 754                         NULL, NULL, &msgid );
 755
 756         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 757                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 758                         if ( dolock ) {
 759                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 760                         }
 761
 762                         assert( lc->lc_refcnt > 0 );
 763                         if ( lc->lc_refcnt == 1 ) {
 764                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 765                                 lc->lc_ld = NULL;
 766
 767                                 /* lc here must be the regular lc, reset and ready for init */
 768                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 769                         }
 770                         if ( dolock ) {
 771                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 772                         }
 773                         if ( rs->sr_err == LDAP_SUCCESS ) {
 774                                 if ( retries > 0 ) {
 775                                         retries--;
 776                                 }
 777                                 goto retry;
 778                         }
 779                 }
 780
 781                 ldap_back_freeconn( op, lc, dolock );
 782                 rs->sr_err = slap_map_api2result( rs );
 783
 784                 return 0;
 785         }
 786
 787         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
 788         if ( rc == LDAP_SUCCESS ) {
 789                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 790
 791         } else {
 792                 ldap_back_release_conn( op, rs, lc );
 793         }
 794
 795 done:;
 796         rc = LDAP_BACK_CONN_ISBOUND( lc );
 797
 798         return rc;
 799 }
 800
 801 int
 802 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 803 {
 804         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 805
 806         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
 807 }
 808
 809 /*
 810  * ldap_back_default_rebind
 811  *
 812  * This is a callback used for chasing referrals using the same
 813  * credentials as the original user on this session.
 814  */
 815 static int
 816 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 817         ber_int_t msgid, void *params )
 818 {
 819         ldapconn_t      *lc = (ldapconn_t *)params;
 820
 821 #ifdef HAVE_TLS
 822         /* ... otherwise we couldn't get here */
 823         assert( lc != NULL );
 824
 825         if ( !ldap_tls_inplace( ld ) ) {
 826                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
 827                                 rc;
 828                 const char      *text = NULL;
 829
 830                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
 831                         LDAP_BACK_RETRY_DEFAULT, &text );
 832                 if ( rc != LDAP_SUCCESS ) {
 833                         return rc;
 834                 }
 835         }
 836 #endif /* HAVE_TLS */
 837
 838         /* FIXME: add checks on the URL/identity? */
 839
 840         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
 841                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
 842 }
 843
 844 int
 845 ldap_back_op_result(
 846                 ldapconn_t              *lc,
 847                 Operation               *op,
 848                 SlapReply               *rs,
 849                 ber_int_t               msgid,
 850                 time_t                  timeout,
 851                 ldap_back_send_t        sendok )
 852 {
 853         char            *match = NULL;
 854         LDAPMessage     *res = NULL;
 855         char            *text = NULL;
 856
 857 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 858
 859         rs->sr_text = NULL;
 860         rs->sr_matched = NULL;
 861
 862         /* if the error recorded in the reply corresponds
 863          * to a successful state, get the error from the
 864          * remote server response */
 865         if ( ERR_OK( rs->sr_err ) ) {
 866                 int             rc;
 867                 struct timeval  tv;
 868
 869                 if ( timeout ) {
 870                         tv.tv_sec = timeout;
 871                         tv.tv_usec = 0;
 872
 873                 } else {
 874                         LDAP_BACK_TV_SET( &tv );
 875                 }
 876
 877 retry:;
 878                 /* if result parsing fails, note the failure reason */
 879                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
 880                 switch ( rc ) {
 881                 case 0:
 882                         if ( timeout ) {
 883                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 884                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
 885                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
 886                                 rs->sr_text = "Operation timed out";
 887                                 break;
 888                         }
 889
 890                         LDAP_BACK_TV_SET( &tv );
 891                         ldap_pvt_thread_yield();
 892                         goto retry;
 893
 894                 case -1:
 895                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
 896                                         &rs->sr_err );
 897                         break;
 898
 899
 900                 /* otherwise get the result; if it is not
 901                  * LDAP_SUCCESS, record it in the reply
 902                  * structure (this includes
 903                  * LDAP_COMPARE_{TRUE|FALSE}) */
 904                 default:
 905                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 906                                         &match, &text, NULL, NULL, 1 );
 907 #ifndef LDAP_NULL_IS_NULL
 908                         if ( match != NULL && match[ 0 ] == '\0' ) {
 909                                 ldap_memfree( match );
 910                                 match = NULL;
 911                         }
 912                         if ( text != NULL && text[ 0 ] == '\0' ) {
 913                                 ldap_memfree( text );
 914                                 text = NULL;
 915                         }
 916 #endif /* LDAP_NULL_IS_NULL */
 917                         rs->sr_text = text;
 918                         if ( rc != LDAP_SUCCESS ) {
 919                                 rs->sr_err = rc;
 920                         }
 921                 }
 922         }
 923
 924         /* if the error in the reply structure is not
 925          * LDAP_SUCCESS, try to map it from client
 926          * to server error */
 927         if ( !ERR_OK( rs->sr_err ) ) {
 928                 rs->sr_err = slap_map_api2result( rs );
 929
 930                 /* internal ops ( op->o_conn == NULL )
 931                  * must not reply to client */
 932                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 933
 934                         /* record the (massaged) matched
 935                          * DN into the reply structure */
 936                         rs->sr_matched = match;
 937                 }
 938         }
 939         if ( op->o_conn &&
 940                         ( ( sendok & LDAP_BACK_SENDOK )
 941                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
 942         {
 943                 send_ldap_result( op, rs );
 944         }
 945         if ( match ) {
 946                 if ( rs->sr_matched != match ) {
 947                         free( (char *)rs->sr_matched );
 948                 }
 949                 rs->sr_matched = NULL;
 950                 ldap_memfree( match );
 951         }
 952         if ( text ) {
 953                 ldap_memfree( text );
 954         }
 955         rs->sr_text = NULL;
 956         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
 957 }
 958
 959 /* return true if bound, false if failed */
 960 int
 961 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 962 {
 963         int             rc = 0;
 964         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 965
 966         assert( lcp != NULL );
 967         assert( *lcp != NULL );
 968
 969         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 970
 971         if ( (*lcp)->lc_refcnt == 1 ) {
 972                 Debug( LDAP_DEBUG_ANY,
 973                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
 974                         op->o_log_prefix, li->li_uri,
 975                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
 976                                 "" : (*lcp)->lc_bound_ndn.bv_val );
 977
 978                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
 979                 (*lcp)->lc_ld = NULL;
 980                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
 981
 982                 /* lc here must be the regular lc, reset and ready for init */
 983                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
 984                 if ( rc != LDAP_SUCCESS ) {
 985                         rc = 0;
 986                         *lcp = NULL;
 987
 988                 } else {
 989                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
 990                         if ( rc == 0 ) {
 991                                 *lcp = NULL;
 992                         }
 993                 }
 994         }
 995
 996         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 997
 998         return rc;
 999 }
1000
1001 static int
1002 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs )
1003 {
1004         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1005         struct berval   binddn = slap_empty_bv;
1006         struct berval   bindcred = slap_empty_bv;
1007         struct berval   ndn;
1008         int             dobind = 0;
1009         int             msgid;
1010         int             rc;
1011
1012         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1013                 ndn = op->o_conn->c_ndn;
1014
1015         } else {
1016                 ndn = op->o_ndn;
1017         }
1018
1019         /*
1020          * FIXME: we need to let clients use proxyAuthz
1021          * otherwise we cannot do symmetric pools of servers;
1022          * we have to live with the fact that a user can
1023          * authorize itself as any ID that is allowed
1024          * by the authzTo directive of the "proxyauthzdn".
1025          */
1026         /*
1027          * NOTE: current Proxy Authorization specification
1028          * and implementation do not allow proxy authorization
1029          * control to be provided with Bind requests
1030          */
1031         /*
1032          * if no bind took place yet, but the connection is bound
1033          * and the "proxyauthzdn" is set, then bind as
1034          * "proxyauthzdn" and explicitly add the proxyAuthz
1035          * control to every operation with the dn bound
1036          * to the connection as control value.
1037          */
1038
1039         /* bind as proxyauthzdn only if no idassert mode
1040          * is requested, or if the client's identity
1041          * is authorized */
1042         switch ( li->li_idassert_mode ) {
1043         case LDAP_BACK_IDASSERT_LEGACY:
1044                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1045                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1046                         {
1047                                 binddn = li->li_idassert_authcDN;
1048                                 bindcred = li->li_idassert_passwd;
1049                                 dobind = 1;
1050                         }
1051                 }
1052                 break;
1053
1054         default:
1055                 /* NOTE: rootdn can always idassert */
1056                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1057                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1058                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1059                                 send_ldap_result( op, rs );
1060                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1061
1062                         } else {
1063                                 rs->sr_err = LDAP_SUCCESS;
1064                                 binddn = slap_empty_bv;
1065                                 bindcred = slap_empty_bv;
1066                                 break;
1067                         }
1068
1069                         goto done;
1070
1071                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1072                         struct berval authcDN;
1073
1074                         if ( BER_BVISNULL( &ndn ) ) {
1075                                 authcDN = slap_empty_bv;
1076
1077                         } else {
1078                                 authcDN = ndn;
1079                         }
1080                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1081                                         &authcDN, &authcDN );
1082                         if ( rs->sr_err != LDAP_SUCCESS ) {
1083                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1084                                         send_ldap_result( op, rs );
1085                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1086
1087                                 } else {
1088                                         rs->sr_err = LDAP_SUCCESS;
1089                                         binddn = slap_empty_bv;
1090                                         bindcred = slap_empty_bv;
1091                                         break;
1092                                 }
1093
1094                                 goto done;
1095                         }
1096                 }
1097
1098                 binddn = li->li_idassert_authcDN;
1099                 bindcred = li->li_idassert_passwd;
1100                 dobind = 1;
1101                 break;
1102         }
1103
1104         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1105 #ifdef HAVE_CYRUS_SASL
1106                 void            *defaults = NULL;
1107                 struct berval   authzID = BER_BVNULL;
1108                 int             freeauthz = 0;
1109
1110                 /* if SASL supports native authz, prepare for it */
1111                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1112                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1113                 {
1114                         switch ( li->li_idassert_mode ) {
1115                         case LDAP_BACK_IDASSERT_OTHERID:
1116                         case LDAP_BACK_IDASSERT_OTHERDN:
1117                                 authzID = li->li_idassert_authzID;
1118                                 break;
1119
1120                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1121                                 BER_BVSTR( &authzID, "dn:" );
1122                                 break;
1123
1124                         case LDAP_BACK_IDASSERT_SELF:
1125                                 if ( BER_BVISNULL( &ndn ) ) {
1126                                         /* connection is not authc'd, so don't idassert */
1127                                         BER_BVSTR( &authzID, "dn:" );
1128                                         break;
1129                                 }
1130                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1131                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1132                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1133                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1134                                                 ndn.bv_val, ndn.bv_len + 1 );
1135                                 freeauthz = 1;
1136                                 break;
1137
1138                         default:
1139                                 break;
1140                         }
1141                 }
1142
1143                 if ( li->li_idassert_secprops != NULL ) {
1144                         rs->sr_err = ldap_set_option( lc->lc_ld,
1145                                 LDAP_OPT_X_SASL_SECPROPS,
1146                                 (void *)li->li_idassert_secprops );
1147
1148                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1149                                 send_ldap_result( op, rs );
1150                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1151                                 goto done;
1152                         }
1153                 }
1154
1155                 defaults = lutil_sasl_defaults( lc->lc_ld,
1156                                 li->li_idassert_sasl_mech.bv_val,
1157                                 li->li_idassert_sasl_realm.bv_val,
1158                                 li->li_idassert_authcID.bv_val,
1159                                 li->li_idassert_passwd.bv_val,
1160                                 authzID.bv_val );
1161
1162                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1163                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1164                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1165                                 defaults );
1166
1167                 rs->sr_err = slap_map_api2result( rs );
1168                 if ( rs->sr_err != LDAP_SUCCESS ) {
1169                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1170                         send_ldap_result( op, rs );
1171
1172                 } else {
1173                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1174                 }
1175
1176                 lutil_sasl_freedefs( defaults );
1177                 if ( freeauthz ) {
1178                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1179                 }
1180
1181                 goto done;
1182 #endif /* HAVE_CYRUS_SASL */
1183         }
1184
1185         switch ( li->li_idassert_authmethod ) {
1186         case LDAP_AUTH_NONE:
1187                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1188                 goto done;
1189
1190         case LDAP_AUTH_SIMPLE:
1191                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1192                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1193                                 &bindcred, NULL, NULL, &msgid );
1194                 break;
1195
1196         default:
1197                 /* unsupported! */
1198                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1199                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1200                 send_ldap_result( op, rs );
1201                 goto done;
1202         }
1203
1204         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
1205         if ( rc == LDAP_SUCCESS ) {
1206                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1207         }
1208 done:;
1209         return LDAP_BACK_CONN_ISBOUND( lc );
1210 }
1211
1212 /*
1213  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1214  * to existing server-side controls if required; if not,
1215  * the existing server-side controls are placed in *pctrls.
1216  * The caller, after using the controls in client API
1217  * operations, if ( *pctrls != op->o_ctrls ), should
1218  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1219  * The function returns success if the control could
1220  * be added if required, or if it did nothing; in the future,
1221  * it might return some error if it failed.
1222  *
1223  * if no bind took place yet, but the connection is bound
1224  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1225  * and explicitly add proxyAuthz the control to every operation
1226  * with the dn bound to the connection as control value.
1227  *
1228  * If no server-side controls are defined for the operation,
1229  * simply add the proxyAuthz control; otherwise, if the
1230  * proxyAuthz control is not already set, add it as
1231  * the first one
1232  *
1233  * FIXME: is controls order significant for security?
1234  * ANSWER: controls ordering and interoperability
1235  * must be indicated by the specs of each control; if none
1236  * is specified, the order is irrelevant.
1237  */
1238 int
1239 ldap_back_proxy_authz_ctrl(
1240                 ldapconn_t      *lc,
1241                 Operation       *op,
1242                 SlapReply       *rs,
1243                 LDAPControl     ***pctrls )
1244 {
1245         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1246         LDAPControl     **ctrls = NULL;
1247         int             i = 0,
1248                         mode;
1249         struct berval   assertedID,
1250                         ndn;
1251
1252         *pctrls = NULL;
1253
1254         rs->sr_err = LDAP_SUCCESS;
1255
1256         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1257          * but if it is not set this test fails.  We need a different
1258          * means to detect if idassert is enabled */
1259         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1260                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1261         {
1262                 goto done;
1263         }
1264
1265         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1266                 goto done;
1267         }
1268
1269         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1270                 ndn = op->o_conn->c_ndn;
1271
1272         } else {
1273                 ndn = op->o_ndn;
1274         }
1275
1276         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1277                 if ( op->o_proxy_authz ) {
1278                         /*
1279                          * FIXME: we do not want to perform proxyAuthz
1280                          * on behalf of the client, because this would
1281                          * be performed with "proxyauthzdn" privileges.
1282                          *
1283                          * This might actually be too strict, since
1284                          * the "proxyauthzdn" authzTo, and each entry's
1285                          * authzFrom attributes may be crafted
1286                          * to avoid unwanted proxyAuthz to take place.
1287                          */
1288 #if 0
1289                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1290                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1291 #endif
1292                         goto done;
1293                 }
1294
1295                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1296                         goto done;
1297                 }
1298
1299                 if ( BER_BVISNULL( &ndn ) ) {
1300                         goto done;
1301                 }
1302
1303                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1304                         goto done;
1305                 }
1306
1307         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1308                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1309                                 /* && ( !BER_BVISNULL( &ndn )
1310                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1311                 {
1312                         /* already asserted in SASL via native authz */
1313                         /* NOTE: the test on lc->lc_bound is used to trap
1314                          * native authorization of anonymous users,
1315                          * since in that case ndn is NULL */
1316                         goto done;
1317                 }
1318
1319         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1320                 int             rc;
1321                 struct berval authcDN;
1322
1323                 if ( BER_BVISNULL( &ndn ) ) {
1324                         authcDN = slap_empty_bv;
1325                 } else {
1326                         authcDN = ndn;
1327                 }
1328                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1329                                 &authcDN, & authcDN );
1330                 if ( rc != LDAP_SUCCESS ) {
1331                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1332                         {
1333                                 /* ndn is not authorized
1334                                  * to use idassert */
1335                                 return rc;
1336                         }
1337                         return rs->sr_err;
1338                 }
1339         }
1340
1341         if ( op->o_proxy_authz ) {
1342                 /*
1343                  * FIXME: we can:
1344                  * 1) ignore the already set proxyAuthz control
1345                  * 2) leave it in place, and don't set ours
1346                  * 3) add both
1347                  * 4) reject the operation
1348                  *
1349                  * option (4) is very drastic
1350                  * option (3) will make the remote server reject
1351                  * the operation, thus being equivalent to (4)
1352                  * option (2) will likely break the idassert
1353                  * assumptions, so we cannot accept it;
1354                  * option (1) means that we are contradicting
1355                  * the client's reques.
1356                  *
1357                  * I think (4) is the only correct choice.
1358                  */
1359                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1360                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1361         }
1362
1363         if ( op->o_is_auth_check ) {
1364                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1365
1366         } else {
1367                 mode = li->li_idassert_mode;
1368         }
1369
1370         switch ( mode ) {
1371         case LDAP_BACK_IDASSERT_LEGACY:
1372         case LDAP_BACK_IDASSERT_SELF:
1373                 /* original behavior:
1374                  * assert the client's identity */
1375                 if ( BER_BVISNULL( &ndn ) ) {
1376                         assertedID = slap_empty_bv;
1377                 } else {
1378                         assertedID = ndn;
1379                 }
1380                 break;
1381
1382         case LDAP_BACK_IDASSERT_ANONYMOUS:
1383                 /* assert "anonymous" */
1384                 assertedID = slap_empty_bv;
1385                 break;
1386
1387         case LDAP_BACK_IDASSERT_NOASSERT:
1388                 /* don't assert; bind as proxyauthzdn */
1389                 goto done;
1390
1391         case LDAP_BACK_IDASSERT_OTHERID:
1392         case LDAP_BACK_IDASSERT_OTHERDN:
1393                 /* assert idassert DN */
1394                 assertedID = li->li_idassert_authzID;
1395                 break;
1396
1397         default:
1398                 assert( 0 );
1399         }
1400
1401         if ( BER_BVISNULL( &assertedID ) ) {
1402                 assertedID = slap_empty_bv;
1403         }
1404
1405         if ( op->o_ctrls ) {
1406                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1407                         /* just count ctrls */ ;
1408         }
1409
1410         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
1411         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
1412
1413         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1414         ctrls[ 0 ]->ldctl_iscritical = 1;
1415
1416         switch ( li->li_idassert_mode ) {
1417         /* already in u:ID or dn:DN form */
1418         case LDAP_BACK_IDASSERT_OTHERID:
1419         case LDAP_BACK_IDASSERT_OTHERDN:
1420                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
1421                 break;
1422
1423         /* needs the dn: prefix */
1424         default:
1425                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1426                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
1427                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1428                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1429                                 assertedID.bv_val, assertedID.bv_len + 1 );
1430                 break;
1431         }
1432
1433         if ( op->o_ctrls ) {
1434                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1435                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1436                 }
1437         }
1438         ctrls[ i + 1 ] = NULL;
1439
1440 done:;
1441         if ( ctrls == NULL ) {
1442                 ctrls = op->o_ctrls;
1443         }
1444
1445         *pctrls = ctrls;
1446
1447         return rs->sr_err;
1448 }
1449
1450 int
1451 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1452 {
1453         LDAPControl     **ctrls = *pctrls;
1454
1455         /* we assume that the first control is the proxyAuthz
1456          * added by back-ldap, so it's the only one we explicitly
1457          * free */
1458         if ( ctrls && ctrls != op->o_ctrls ) {
1459                 assert( ctrls[ 0 ] != NULL );
1460
1461                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1462                         free( ctrls[ 0 ]->ldctl_value.bv_val );
1463                 }
1464
1465                 free( ctrls[ 0 ] );
1466                 free( ctrls );
1467         }
1468
1469         *pctrls = NULL;
1470
1471         return 0;
1472 }