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
 671         /*
 672          * FIXME: we need to let clients use proxyAuthz
 673          * otherwise we cannot do symmetric pools of servers;
 674          * we have to live with the fact that a user can
 675          * authorize itself as any ID that is allowed
 676          * by the authzTo directive of the "proxyauthzdn".
 677          */
 678         /*
 679          * NOTE: current Proxy Authorization specification
 680          * and implementation do not allow proxy authorization
 681          * control to be provided with Bind requests
 682          */
 683         /*
 684          * if no bind took place yet, but the connection is bound
 685          * and the "idassert-authcDN" (or other ID) is set,
 686          * then bind as the asserting identity and explicitly
 687          * add the proxyAuthz control to every operation with the
 688          * dn bound to the connection as control value.
 689          * This is done also if this is the authrizing backend,
 690          * but the "override" flag is given to idassert.
 691          * It allows to use SASL bind and yet proxyAuthz users
 692          */
 693         if ( op->o_conn != NULL &&
 694                         !op->o_do_not_cache &&
 695                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 696                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 697         {
 698                 (void)ldap_back_proxy_authz_bind( lc, op, rs );
 699                 goto done;
 700         }
 701
 702 #ifdef HAVE_CYRUS_SASL
 703         if ( LDAP_BACK_CONN_ISPRIV( lc )
 704                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 705         {
 706                 void            *defaults = NULL;
 707
 708                 if ( li->li_acl_secprops != NULL ) {
 709                         rc = ldap_set_option( lc->lc_ld,
 710                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 711
 712                         if ( rc != LDAP_OPT_SUCCESS ) {
 713                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 714                                         "(%s,SECPROPS,\"%s\") failed!\n",
 715                                         li->li_uri, li->li_acl_secprops, 0 );
 716                                 goto done;
 717                         }
 718                 }
 719
 720                 defaults = lutil_sasl_defaults( lc->lc_ld,
 721                                 li->li_acl_sasl_mech.bv_val,
 722                                 li->li_acl_sasl_realm.bv_val,
 723                                 li->li_acl_authcID.bv_val,
 724                                 li->li_acl_passwd.bv_val,
 725                                 NULL );
 726
 727                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 728                                 li->li_acl_authcDN.bv_val,
 729                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 730                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 731                                 defaults );
 732
 733                 lutil_sasl_freedefs( defaults );
 734
 735                 rs->sr_err = slap_map_api2result( rs );
 736                 if ( rs->sr_err != LDAP_SUCCESS ) {
 737                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 738                         send_ldap_result( op, rs );
 739
 740                 } else {
 741                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 742                 }
 743                 goto done;
 744         }
 745 #endif /* HAVE_CYRUS_SASL */
 746
 747 retry:;
 748         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 749                         lc->lc_bound_ndn.bv_val,
 750                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 751                         NULL, NULL, &msgid );
 752
 753         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 754                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 755                         if ( dolock ) {
 756                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 757                         }
 758
 759                         assert( lc->lc_refcnt > 0 );
 760                         if ( lc->lc_refcnt == 1 ) {
 761                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 762                                 lc->lc_ld = NULL;
 763
 764                                 /* lc here must be the regular lc, reset and ready for init */
 765                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 766                         }
 767                         if ( dolock ) {
 768                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 769                         }
 770                         if ( rs->sr_err == LDAP_SUCCESS ) {
 771                                 if ( retries > 0 ) {
 772                                         retries--;
 773                                 }
 774                                 goto retry;
 775                         }
 776                 }
 777
 778                 ldap_back_freeconn( op, lc, dolock );
 779                 rs->sr_err = slap_map_api2result( rs );
 780
 781                 return 0;
 782         }
 783
 784         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
 785         if ( rc == LDAP_SUCCESS ) {
 786                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 787
 788         } else {
 789                 ldap_back_release_conn( op, rs, lc );
 790         }
 791
 792 done:;
 793         rc = LDAP_BACK_CONN_ISBOUND( lc );
 794
 795         return rc;
 796 }
 797
 798 int
 799 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 800 {
 801         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 802
 803         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
 804 }
 805
 806 /*
 807  * ldap_back_default_rebind
 808  *
 809  * This is a callback used for chasing referrals using the same
 810  * credentials as the original user on this session.
 811  */
 812 static int
 813 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 814         ber_int_t msgid, void *params )
 815 {
 816         ldapconn_t      *lc = (ldapconn_t *)params;
 817
 818 #ifdef HAVE_TLS
 819         /* ... otherwise we couldn't get here */
 820         assert( lc != NULL );
 821
 822         if ( !ldap_tls_inplace( ld ) ) {
 823                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
 824                                 rc;
 825                 const char      *text = NULL;
 826
 827                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
 828                         LDAP_BACK_RETRY_DEFAULT, &text );
 829                 if ( rc != LDAP_SUCCESS ) {
 830                         return rc;
 831                 }
 832         }
 833 #endif /* HAVE_TLS */
 834
 835         /* FIXME: add checks on the URL/identity? */
 836
 837         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
 838                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
 839 }
 840
 841 int
 842 ldap_back_op_result(
 843                 ldapconn_t              *lc,
 844                 Operation               *op,
 845                 SlapReply               *rs,
 846                 ber_int_t               msgid,
 847                 time_t                  timeout,
 848                 ldap_back_send_t        sendok )
 849 {
 850         char            *match = NULL;
 851         LDAPMessage     *res = NULL;
 852         char            *text = NULL;
 853
 854 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 855
 856         rs->sr_text = NULL;
 857         rs->sr_matched = NULL;
 858
 859         /* if the error recorded in the reply corresponds
 860          * to a successful state, get the error from the
 861          * remote server response */
 862         if ( ERR_OK( rs->sr_err ) ) {
 863                 int             rc;
 864                 struct timeval  tv;
 865
 866                 if ( timeout ) {
 867                         tv.tv_sec = timeout;
 868                         tv.tv_usec = 0;
 869
 870                 } else {
 871                         LDAP_BACK_TV_SET( &tv );
 872                 }
 873
 874 retry:;
 875                 /* if result parsing fails, note the failure reason */
 876                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
 877                 switch ( rc ) {
 878                 case 0:
 879                         if ( timeout ) {
 880                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 881                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
 882                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
 883                                 rs->sr_text = "Operation timed out";
 884                                 break;
 885                         }
 886
 887                         LDAP_BACK_TV_SET( &tv );
 888                         ldap_pvt_thread_yield();
 889                         goto retry;
 890
 891                 case -1:
 892                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
 893                                         &rs->sr_err );
 894                         break;
 895
 896
 897                 /* otherwise get the result; if it is not
 898                  * LDAP_SUCCESS, record it in the reply
 899                  * structure (this includes
 900                  * LDAP_COMPARE_{TRUE|FALSE}) */
 901                 default:
 902                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 903                                         &match, &text, NULL, NULL, 1 );
 904 #ifndef LDAP_NULL_IS_NULL
 905                         if ( match != NULL && match[ 0 ] == '\0' ) {
 906                                 ldap_memfree( match );
 907                                 match = NULL;
 908                         }
 909                         if ( text != NULL && text[ 0 ] == '\0' ) {
 910                                 ldap_memfree( text );
 911                                 text = NULL;
 912                         }
 913 #endif /* LDAP_NULL_IS_NULL */
 914                         rs->sr_text = text;
 915                         if ( rc != LDAP_SUCCESS ) {
 916                                 rs->sr_err = rc;
 917                         }
 918                 }
 919         }
 920
 921         /* if the error in the reply structure is not
 922          * LDAP_SUCCESS, try to map it from client
 923          * to server error */
 924         if ( !ERR_OK( rs->sr_err ) ) {
 925                 rs->sr_err = slap_map_api2result( rs );
 926
 927                 /* internal ops ( op->o_conn == NULL )
 928                  * must not reply to client */
 929                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 930
 931                         /* record the (massaged) matched
 932                          * DN into the reply structure */
 933                         rs->sr_matched = match;
 934                 }
 935         }
 936         if ( op->o_conn &&
 937                         ( ( sendok & LDAP_BACK_SENDOK )
 938                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
 939         {
 940                 send_ldap_result( op, rs );
 941         }
 942         if ( match ) {
 943                 if ( rs->sr_matched != match ) {
 944                         free( (char *)rs->sr_matched );
 945                 }
 946                 rs->sr_matched = NULL;
 947                 ldap_memfree( match );
 948         }
 949         if ( text ) {
 950                 ldap_memfree( text );
 951         }
 952         rs->sr_text = NULL;
 953         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
 954 }
 955
 956 /* return true if bound, false if failed */
 957 int
 958 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 959 {
 960         int             rc = 0;
 961         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 962
 963         assert( lcp != NULL );
 964         assert( *lcp != NULL );
 965
 966         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 967
 968         if ( (*lcp)->lc_refcnt == 1 ) {
 969                 Debug( LDAP_DEBUG_ANY,
 970                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
 971                         op->o_log_prefix, li->li_uri,
 972                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
 973                                 "" : (*lcp)->lc_bound_ndn.bv_val );
 974
 975                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
 976                 (*lcp)->lc_ld = NULL;
 977                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
 978
 979                 /* lc here must be the regular lc, reset and ready for init */
 980                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
 981                 if ( rc != LDAP_SUCCESS ) {
 982                         rc = 0;
 983                         *lcp = NULL;
 984
 985                 } else {
 986                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
 987                         if ( rc == 0 ) {
 988                                 *lcp = NULL;
 989                         }
 990                 }
 991         }
 992
 993         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 994
 995         return rc;
 996 }
 997
 998 static int
 999 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs )
1000 {
1001         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1002         struct berval   binddn = slap_empty_bv;
1003         struct berval   bindcred = slap_empty_bv;
1004         struct berval   ndn;
1005         int             dobind = 0;
1006         int             msgid;
1007         int             rc;
1008
1009         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1010                 ndn = op->o_conn->c_ndn;
1011
1012         } else {
1013                 ndn = op->o_ndn;
1014         }
1015
1016         /*
1017          * FIXME: we need to let clients use proxyAuthz
1018          * otherwise we cannot do symmetric pools of servers;
1019          * we have to live with the fact that a user can
1020          * authorize itself as any ID that is allowed
1021          * by the authzTo directive of the "proxyauthzdn".
1022          */
1023         /*
1024          * NOTE: current Proxy Authorization specification
1025          * and implementation do not allow proxy authorization
1026          * control to be provided with Bind requests
1027          */
1028         /*
1029          * if no bind took place yet, but the connection is bound
1030          * and the "proxyauthzdn" is set, then bind as
1031          * "proxyauthzdn" and explicitly add the proxyAuthz
1032          * control to every operation with the dn bound
1033          * to the connection as control value.
1034          */
1035
1036         /* bind as proxyauthzdn only if no idassert mode
1037          * is requested, or if the client's identity
1038          * is authorized */
1039         switch ( li->li_idassert_mode ) {
1040         case LDAP_BACK_IDASSERT_LEGACY:
1041                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1042                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1043                         {
1044                                 binddn = li->li_idassert_authcDN;
1045                                 bindcred = li->li_idassert_passwd;
1046                                 dobind = 1;
1047                         }
1048                 }
1049                 break;
1050
1051         default:
1052                 /* NOTE: rootdn can always idassert */
1053                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1054                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1055                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1056                                 send_ldap_result( op, rs );
1057                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1058
1059                         } else {
1060                                 rs->sr_err = LDAP_SUCCESS;
1061                                 binddn = slap_empty_bv;
1062                                 bindcred = slap_empty_bv;
1063                                 break;
1064                         }
1065
1066                         goto done;
1067
1068                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1069                         struct berval authcDN;
1070
1071                         if ( BER_BVISNULL( &ndn ) ) {
1072                                 authcDN = slap_empty_bv;
1073
1074                         } else {
1075                                 authcDN = ndn;
1076                         }
1077                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1078                                         &authcDN, &authcDN );
1079                         if ( rs->sr_err != LDAP_SUCCESS ) {
1080                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1081                                         send_ldap_result( op, rs );
1082                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1083
1084                                 } else {
1085                                         rs->sr_err = LDAP_SUCCESS;
1086                                         binddn = slap_empty_bv;
1087                                         bindcred = slap_empty_bv;
1088                                         break;
1089                                 }
1090
1091                                 goto done;
1092                         }
1093                 }
1094
1095                 binddn = li->li_idassert_authcDN;
1096                 bindcred = li->li_idassert_passwd;
1097                 dobind = 1;
1098                 break;
1099         }
1100
1101         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1102 #ifdef HAVE_CYRUS_SASL
1103                 void            *defaults = NULL;
1104                 struct berval   authzID = BER_BVNULL;
1105                 int             freeauthz = 0;
1106
1107                 /* if SASL supports native authz, prepare for it */
1108                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1109                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1110                 {
1111                         switch ( li->li_idassert_mode ) {
1112                         case LDAP_BACK_IDASSERT_OTHERID:
1113                         case LDAP_BACK_IDASSERT_OTHERDN:
1114                                 authzID = li->li_idassert_authzID;
1115                                 break;
1116
1117                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1118                                 BER_BVSTR( &authzID, "dn:" );
1119                                 break;
1120
1121                         case LDAP_BACK_IDASSERT_SELF:
1122                                 if ( BER_BVISNULL( &ndn ) ) {
1123                                         /* connection is not authc'd, so don't idassert */
1124                                         BER_BVSTR( &authzID, "dn:" );
1125                                         break;
1126                                 }
1127                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1128                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1129                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1130                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1131                                                 ndn.bv_val, ndn.bv_len + 1 );
1132                                 freeauthz = 1;
1133                                 break;
1134
1135                         default:
1136                                 break;
1137                         }
1138                 }
1139
1140                 if ( li->li_idassert_secprops != NULL ) {
1141                         rs->sr_err = ldap_set_option( lc->lc_ld,
1142                                 LDAP_OPT_X_SASL_SECPROPS,
1143                                 (void *)li->li_idassert_secprops );
1144
1145                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1146                                 send_ldap_result( op, rs );
1147                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1148                                 goto done;
1149                         }
1150                 }
1151
1152                 defaults = lutil_sasl_defaults( lc->lc_ld,
1153                                 li->li_idassert_sasl_mech.bv_val,
1154                                 li->li_idassert_sasl_realm.bv_val,
1155                                 li->li_idassert_authcID.bv_val,
1156                                 li->li_idassert_passwd.bv_val,
1157                                 authzID.bv_val );
1158
1159                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1160                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1161                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1162                                 defaults );
1163
1164                 rs->sr_err = slap_map_api2result( rs );
1165                 if ( rs->sr_err != LDAP_SUCCESS ) {
1166                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1167                         send_ldap_result( op, rs );
1168
1169                 } else {
1170                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1171                 }
1172
1173                 lutil_sasl_freedefs( defaults );
1174                 if ( freeauthz ) {
1175                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1176                 }
1177
1178                 goto done;
1179 #endif /* HAVE_CYRUS_SASL */
1180         }
1181
1182         switch ( li->li_idassert_authmethod ) {
1183         case LDAP_AUTH_NONE:
1184                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1185                 goto done;
1186
1187         case LDAP_AUTH_SIMPLE:
1188                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1189                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1190                                 &bindcred, NULL, NULL, &msgid );
1191                 break;
1192
1193         default:
1194                 /* unsupported! */
1195                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1196                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1197                 send_ldap_result( op, rs );
1198                 goto done;
1199         }
1200
1201         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
1202         if ( rc == LDAP_SUCCESS ) {
1203                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1204         }
1205 done:;
1206         return LDAP_BACK_CONN_ISBOUND( lc );
1207 }
1208
1209 /*
1210  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1211  * to existing server-side controls if required; if not,
1212  * the existing server-side controls are placed in *pctrls.
1213  * The caller, after using the controls in client API
1214  * operations, if ( *pctrls != op->o_ctrls ), should
1215  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1216  * The function returns success if the control could
1217  * be added if required, or if it did nothing; in the future,
1218  * it might return some error if it failed.
1219  *
1220  * if no bind took place yet, but the connection is bound
1221  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1222  * and explicitly add proxyAuthz the control to every operation
1223  * with the dn bound to the connection as control value.
1224  *
1225  * If no server-side controls are defined for the operation,
1226  * simply add the proxyAuthz control; otherwise, if the
1227  * proxyAuthz control is not already set, add it as
1228  * the first one
1229  *
1230  * FIXME: is controls order significant for security?
1231  * ANSWER: controls ordering and interoperability
1232  * must be indicated by the specs of each control; if none
1233  * is specified, the order is irrelevant.
1234  */
1235 int
1236 ldap_back_proxy_authz_ctrl(
1237                 ldapconn_t      *lc,
1238                 Operation       *op,
1239                 SlapReply       *rs,
1240                 LDAPControl     ***pctrls )
1241 {
1242         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1243         LDAPControl     **ctrls = NULL;
1244         int             i = 0,
1245                         mode;
1246         struct berval   assertedID,
1247                         ndn;
1248
1249         *pctrls = NULL;
1250
1251         rs->sr_err = LDAP_SUCCESS;
1252
1253         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1254          * but if it is not set this test fails.  We need a different
1255          * means to detect if idassert is enabled */
1256         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1257                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1258         {
1259                 goto done;
1260         }
1261
1262         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1263                 goto done;
1264         }
1265
1266         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1267                 ndn = op->o_conn->c_ndn;
1268
1269         } else {
1270                 ndn = op->o_ndn;
1271         }
1272
1273         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1274                 if ( op->o_proxy_authz ) {
1275                         /*
1276                          * FIXME: we do not want to perform proxyAuthz
1277                          * on behalf of the client, because this would
1278                          * be performed with "proxyauthzdn" privileges.
1279                          *
1280                          * This might actually be too strict, since
1281                          * the "proxyauthzdn" authzTo, and each entry's
1282                          * authzFrom attributes may be crafted
1283                          * to avoid unwanted proxyAuthz to take place.
1284                          */
1285 #if 0
1286                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1287                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1288 #endif
1289                         goto done;
1290                 }
1291
1292                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1293                         goto done;
1294                 }
1295
1296                 if ( BER_BVISNULL( &ndn ) ) {
1297                         goto done;
1298                 }
1299
1300                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1301                         goto done;
1302                 }
1303
1304         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1305                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1306                                 /* && ( !BER_BVISNULL( &ndn )
1307                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1308                 {
1309                         /* already asserted in SASL via native authz */
1310                         /* NOTE: the test on lc->lc_bound is used to trap
1311                          * native authorization of anonymous users,
1312                          * since in that case ndn is NULL */
1313                         goto done;
1314                 }
1315
1316         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1317                 int             rc;
1318                 struct berval authcDN;
1319
1320                 if ( BER_BVISNULL( &ndn ) ) {
1321                         authcDN = slap_empty_bv;
1322                 } else {
1323                         authcDN = ndn;
1324                 }
1325                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1326                                 &authcDN, & authcDN );
1327                 if ( rc != LDAP_SUCCESS ) {
1328                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1329                         {
1330                                 /* ndn is not authorized
1331                                  * to use idassert */
1332                                 return rc;
1333                         }
1334                         return rs->sr_err;
1335                 }
1336         }
1337
1338         if ( op->o_proxy_authz ) {
1339                 /*
1340                  * FIXME: we can:
1341                  * 1) ignore the already set proxyAuthz control
1342                  * 2) leave it in place, and don't set ours
1343                  * 3) add both
1344                  * 4) reject the operation
1345                  *
1346                  * option (4) is very drastic
1347                  * option (3) will make the remote server reject
1348                  * the operation, thus being equivalent to (4)
1349                  * option (2) will likely break the idassert
1350                  * assumptions, so we cannot accept it;
1351                  * option (1) means that we are contradicting
1352                  * the client's reques.
1353                  *
1354                  * I think (4) is the only correct choice.
1355                  */
1356                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1357                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1358         }
1359
1360         if ( op->o_is_auth_check ) {
1361                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1362
1363         } else {
1364                 mode = li->li_idassert_mode;
1365         }
1366
1367         switch ( mode ) {
1368         case LDAP_BACK_IDASSERT_LEGACY:
1369         case LDAP_BACK_IDASSERT_SELF:
1370                 /* original behavior:
1371                  * assert the client's identity */
1372                 if ( BER_BVISNULL( &ndn ) ) {
1373                         assertedID = slap_empty_bv;
1374                 } else {
1375                         assertedID = ndn;
1376                 }
1377                 break;
1378
1379         case LDAP_BACK_IDASSERT_ANONYMOUS:
1380                 /* assert "anonymous" */
1381                 assertedID = slap_empty_bv;
1382                 break;
1383
1384         case LDAP_BACK_IDASSERT_NOASSERT:
1385                 /* don't assert; bind as proxyauthzdn */
1386                 goto done;
1387
1388         case LDAP_BACK_IDASSERT_OTHERID:
1389         case LDAP_BACK_IDASSERT_OTHERDN:
1390                 /* assert idassert DN */
1391                 assertedID = li->li_idassert_authzID;
1392                 break;
1393
1394         default:
1395                 assert( 0 );
1396         }
1397
1398         if ( BER_BVISNULL( &assertedID ) ) {
1399                 assertedID = slap_empty_bv;
1400         }
1401
1402         if ( op->o_ctrls ) {
1403                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1404                         /* just count ctrls */ ;
1405         }
1406
1407         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
1408         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
1409
1410         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1411         ctrls[ 0 ]->ldctl_iscritical = 1;
1412
1413         switch ( li->li_idassert_mode ) {
1414         /* already in u:ID or dn:DN form */
1415         case LDAP_BACK_IDASSERT_OTHERID:
1416         case LDAP_BACK_IDASSERT_OTHERDN:
1417                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
1418                 break;
1419
1420         /* needs the dn: prefix */
1421         default:
1422                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1423                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
1424                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1425                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1426                                 assertedID.bv_val, assertedID.bv_len + 1 );
1427                 break;
1428         }
1429
1430         if ( op->o_ctrls ) {
1431                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1432                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1433                 }
1434         }
1435         ctrls[ i + 1 ] = NULL;
1436
1437 done:;
1438         if ( ctrls == NULL ) {
1439                 ctrls = op->o_ctrls;
1440         }
1441
1442         *pctrls = ctrls;
1443
1444         return rs->sr_err;
1445 }
1446
1447 int
1448 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1449 {
1450         LDAPControl     **ctrls = *pctrls;
1451
1452         /* we assume that the first control is the proxyAuthz
1453          * added by back-ldap, so it's the only one we explicitly
1454          * free */
1455         if ( ctrls && ctrls != op->o_ctrls ) {
1456                 assert( ctrls[ 0 ] != NULL );
1457
1458                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1459                         free( ctrls[ 0 ]->ldctl_value.bv_val );
1460                 }
1461
1462                 free( ctrls[ 0 ] );
1463                 free( ctrls );
1464         }
1465
1466         *pctrls = NULL;
1467
1468         return 0;
1469 }