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 #ifndef PRINT_CONNTREE
  39 #define PRINT_CONNTREE 0
  40 #endif /* !PRINT_CONNTREE */
  41
  42 #define LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ       "2.16.840.1.113730.3.4.12"
  43
  44 static LDAP_REBIND_PROC ldap_back_default_rebind;
  45
  46 LDAP_REBIND_PROC        *ldap_back_rebind_f = ldap_back_default_rebind;
  47
  48 static int
  49 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  50
  51 static int
  52 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  53
  54 static int
  55 ldap_back_conndnlc_cmp( const void *c1, const void *c2 );
  56
  57 int
  58 ldap_back_bind( Operation *op, SlapReply *rs )
  59 {
  60         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
  61         ldapconn_t      *lc;
  62
  63         int rc = 0;
  64         ber_int_t msgid;
  65
  66         lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR );
  67         if ( !lc ) {
  68                 return rs->sr_err;
  69         }
  70
  71         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
  72                 ch_free( lc->lc_bound_ndn.bv_val );
  73                 BER_BVZERO( &lc->lc_bound_ndn );
  74         }
  75         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
  76
  77         /* method is always LDAP_AUTH_SIMPLE if we got here */
  78         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
  79                         LDAP_SASL_SIMPLE,
  80                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
  81         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
  82
  83         if ( rc == LDAP_SUCCESS ) {
  84                 /* If defined, proxyAuthz will be used also when
  85                  * back-ldap is the authorizing backend; for this
  86                  * purpose, a successful bind is followed by a
  87                  * bind with the configured identity assertion */
  88                 /* NOTE: use with care */
  89                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
  90                         ldap_back_proxy_authz_bind( lc, op, rs, LDAP_BACK_SENDERR );
  91                         if ( !LDAP_BACK_CONN_ISBOUND( lc ) ) {
  92                                 rc = 1;
  93                                 goto done;
  94                         }
  95                 }
  96
  97                 LDAP_BACK_CONN_ISBOUND_SET( lc );
  98                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
  99
 100                 if ( LDAP_BACK_SAVECRED( li ) ) {
 101                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
 102                                 memset( lc->lc_cred.bv_val, 0,
 103                                                 lc->lc_cred.bv_len );
 104                         }
 105                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
 106                         ldap_set_rebind_proc( lc->lc_ld, ldap_back_rebind_f, lc );
 107                 }
 108         }
 109 done:;
 110
 111         assert( lc->lc_binding == 1 );
 112         lc->lc_binding = 0;
 113
 114         /* must re-insert if local DN changed as result of bind */
 115         if ( !LDAP_BACK_CONN_ISBOUND( lc )
 116                 || ( LDAP_BACK_CONN_ISBOUND( lc )
 117                         && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) )
 118         {
 119                 int             lerr = -1;
 120                 ldapconn_t      *tmplc;
 121
 122                 /* wait for all other ops to release the connection */
 123 retry_lock:;
 124                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 125                 if ( lc->lc_refcnt > 1 ) {
 126                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 127                         ldap_pvt_thread_yield();
 128                         goto retry_lock;
 129                 }
 130
 131                 assert( lc->lc_refcnt == 1 );
 132                 tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 133                                 ldap_back_conndnlc_cmp );
 134                 assert( tmplc == NULL || lc == tmplc );
 135
 136                 if ( LDAP_BACK_CONN_ISBOUND( lc ) ) {
 137                         ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 138                         lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 139                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
 140                 }
 141
 142                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 143                 switch ( lerr ) {
 144                 case 0:
 145                         break;
 146
 147                 case -1:
 148                         /* duplicate; someone else successfully bound
 149                          * on the same connection with the same identity;
 150                          * we can do this because lc_refcnt == 1 */
 151                         ldap_back_conn_free( lc );
 152                         lc = NULL;
 153                 }
 154         }
 155
 156         if ( lc != NULL ) {
 157                 ldap_back_release_conn( op, rs, lc );
 158         }
 159
 160         return( rc );
 161 }
 162
 163 /*
 164  * ldap_back_conndn_cmp
 165  *
 166  * compares two ldapconn_t based on the value of the conn pointer
 167  * and of the local DN; used by avl stuff for insert, lookup
 168  * and direct delete
 169  */
 170 int
 171 ldap_back_conndn_cmp( const void *c1, const void *c2 )
 172 {
 173         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 174         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 175         int rc;
 176
 177         /* If local DNs don't match, it is definitely not a match */
 178         /* For shared sessions, conn is NULL. Only explicitly
 179          * bound sessions will have non-NULL conn.
 180          */
 181         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 182         if ( rc == 0 ) {
 183                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 184         }
 185
 186         return rc;
 187 }
 188
 189 /*
 190  * ldap_back_conndnlc_cmp
 191  *
 192  * compares two ldapconn_t based on the value of the conn pointer,
 193  * the local DN and the lc pointer; used by avl stuff for insert, lookup
 194  * and direct delete
 195  */
 196 static int
 197 ldap_back_conndnlc_cmp( const void *c1, const void *c2 )
 198 {
 199         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 200         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 201         int rc;
 202
 203         /* If local DNs don't match, it is definitely not a match */
 204         /* For shared sessions, conn is NULL. Only explicitly
 205          * bound sessions will have non-NULL conn.
 206          */
 207         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 208         if ( rc == 0 ) {
 209                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 210                 if ( rc == 0 ) {
 211                         rc = SLAP_PTRCMP( lc1, lc2 );
 212                 }
 213         }
 214
 215         return rc;
 216 }
 217
 218 /*
 219  * ldap_back_conn_cmp
 220  *
 221  * compares two ldapconn_t based on the value of the conn pointer;
 222  * used by avl stuff for delete of all conns with the same connid
 223  */
 224 int
 225 ldap_back_conn_cmp( const void *c1, const void *c2 )
 226 {
 227         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 228         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 229
 230         /* For shared sessions, conn is NULL. Only explicitly
 231          * bound sessions will have non-NULL conn.
 232          */
 233         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 234 }
 235
 236 /*
 237  * ldap_back_conndn_dup
 238  *
 239  * returns -1 in case a duplicate ldapconn_t has been inserted;
 240  * used by avl stuff
 241  */
 242 int
 243 ldap_back_conndn_dup( void *c1, void *c2 )
 244 {
 245         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 246         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 247
 248         /* Cannot have more than one shared session with same DN */
 249         if ( lc1->lc_conn == lc2->lc_conn &&
 250                 dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) )
 251         {
 252                 return -1;
 253         }
 254
 255         return 0;
 256 }
 257
 258 #if PRINT_CONNTREE > 0
 259 static void
 260 ravl_print( Avlnode *root, int depth )
 261 {
 262         int             i;
 263         ldapconn_t      *lc;
 264
 265         if ( root == 0 ) {
 266                 return;
 267         }
 268
 269         ravl_print( root->avl_right, depth+1 );
 270
 271         for ( i = 0; i < depth; i++ ) {
 272                 fprintf( stderr, "-" );
 273         }
 274
 275         lc = root->avl_data;
 276         fprintf( stderr, "lc=%p local=\"%s\" conn=%p %s refcnt=%d\n",
 277                 (void *)lc, lc->lc_local_ndn.bv_val, (void *)lc->lc_conn,
 278                 avl_bf2str( root->avl_bf ), lc->lc_refcnt );
 279
 280         ravl_print( root->avl_left, depth+1 );
 281 }
 282
 283 static void
 284 myprint( Avlnode *root )
 285 {
 286         fprintf( stderr, "========>\n" );
 287
 288         if ( root == 0 ) {
 289                 fprintf( stderr, "\tNULL\n" );
 290
 291         } else {
 292                 ravl_print( root, 0 );
 293         }
 294
 295         fprintf( stderr, "<========\n" );
 296 }
 297 #endif /* PRINT_CONNTREE */
 298
 299 int
 300 ldap_back_freeconn( Operation *op, ldapconn_t *lc, int dolock )
 301 {
 302         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 303         ldapconn_t      *tmplc;
 304
 305         if ( dolock ) {
 306                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 307         }
 308
 309         tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 310                         ldap_back_conndnlc_cmp );
 311         assert( LDAP_BACK_CONN_TAINTED( lc ) || tmplc == lc );
 312         if ( lc->lc_refcnt == 0 ) {
 313                 ldap_back_conn_free( (void *)lc );
 314         }
 315
 316         if ( dolock ) {
 317                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 318         }
 319
 320         return 0;
 321 }
 322
 323 #ifdef HAVE_TLS
 324 static int
 325 ldap_back_start_tls(
 326         LDAP            *ld,
 327         int             protocol,
 328         int             *is_tls,
 329         const char      *url,
 330         unsigned        flags,
 331         int             retries,
 332         const char      **text )
 333 {
 334         int             rc = LDAP_SUCCESS;
 335         ldapinfo_t      dummy;
 336
 337         /* this is ridiculous... */
 338         dummy.li_flags = flags;
 339
 340         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 341         if ( ( LDAP_BACK_USE_TLS( &dummy ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &dummy ) ) )
 342                                 && !ldap_is_ldaps_url( url ) )
 343         {
 344 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 345                 /*
 346                  * use asynchronous StartTLS
 347                  * in case, chase referral (not implemented yet)
 348                  */
 349                 int             msgid;
 350
 351                 if ( protocol == 0 ) {
 352                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 353                                         (void *)&protocol );
 354                 }
 355
 356                 if ( protocol < LDAP_VERSION3 ) {
 357                         protocol = LDAP_VERSION3;
 358                         /* Set LDAP version */
 359                         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 360                                         (const void *)&protocol );
 361                 }
 362
 363                 rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 364                 if ( rc == LDAP_SUCCESS ) {
 365                         LDAPMessage     *res = NULL;
 366                         struct timeval  tv;
 367
 368                         LDAP_BACK_TV_SET( &tv );
 369
 370 retry:;
 371                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 372                         if ( rc < 0 ) {
 373                                 rc = LDAP_UNAVAILABLE;
 374
 375                         } else if ( rc == 0 ) {
 376                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 377                                         ldap_pvt_thread_yield();
 378                                         if ( retries > 0 ) {
 379                                                 retries--;
 380                                         }
 381                                         LDAP_BACK_TV_SET( &tv );
 382                                         goto retry;
 383                                 }
 384                                 rc = LDAP_UNAVAILABLE;
 385
 386                         } else if ( rc == LDAP_RES_EXTENDED ) {
 387                                 struct berval   *data = NULL;
 388
 389                                 rc = ldap_parse_extended_result( ld, res,
 390                                                 NULL, &data, 0 );
 391                                 if ( rc == LDAP_SUCCESS ) {
 392                                         int err;
 393                                         rc = ldap_parse_result( ld, res, &err,
 394                                                 NULL, NULL, NULL, NULL, 1 );
 395                                         if ( rc == LDAP_SUCCESS ) {
 396                                                 rc = err;
 397                                         }
 398                                         res = NULL;
 399
 400                                         /* FIXME: in case a referral
 401                                          * is returned, should we try
 402                                          * using it instead of the
 403                                          * configured URI? */
 404                                         if ( rc == LDAP_SUCCESS ) {
 405                                                 rc = ldap_install_tls( ld );
 406
 407                                         } else if ( rc == LDAP_REFERRAL ) {
 408                                                 rc = LDAP_UNWILLING_TO_PERFORM;
 409                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 410                                         }
 411
 412                                         if ( data ) {
 413                                                 if ( data->bv_val ) {
 414                                                         ber_memfree( data->bv_val );
 415                                                 }
 416                                                 ber_memfree( data );
 417                                         }
 418                                 }
 419
 420                         } else {
 421                                 rc = LDAP_OTHER;
 422                         }
 423
 424                         if ( res != NULL ) {
 425                                 ldap_msgfree( res );
 426                         }
 427                 }
 428 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 429                 /*
 430                  * use synchronous StartTLS
 431                  */
 432                 rc = ldap_start_tls_s( ld, NULL, NULL );
 433 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 434
 435                 /* if StartTLS is requested, only attempt it if the URL
 436                  * is not "ldaps://"; this may occur not only in case
 437                  * of misconfiguration, but also when used in the chain
 438                  * overlay, where the "uri" can be parsed out of a referral */
 439                 switch ( rc ) {
 440                 case LDAP_SUCCESS:
 441                         *is_tls = 1;
 442                         break;
 443
 444                 case LDAP_SERVER_DOWN:
 445                         break;
 446
 447                 default:
 448                         if ( LDAP_BACK_TLS_CRITICAL( &dummy ) ) {
 449                                 *text = "could not start TLS";
 450                                 break;
 451                         }
 452
 453                         /* in case Start TLS is not critical */
 454                         *is_tls = 0;
 455                         rc = LDAP_SUCCESS;
 456                         break;
 457                 }
 458
 459         } else {
 460                 *is_tls = 0;
 461         }
 462
 463         return rc;
 464 }
 465 #endif /* HAVE_TLS */
 466
 467 static int
 468 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 469 {
 470         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 471         int             vers = op->o_protocol;
 472         LDAP            *ld = NULL;
 473 #ifdef HAVE_TLS
 474         int             is_tls = op->o_conn->c_is_tls;
 475 #endif /* HAVE_TLS */
 476
 477         assert( lcp != NULL );
 478
 479         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 480         if ( rs->sr_err != LDAP_SUCCESS ) {
 481                 goto error_return;
 482         }
 483
 484         /* Set LDAP version. This will always succeed: If the client
 485          * bound with a particular version, then so can we.
 486          */
 487         if ( vers == 0 ) {
 488                 /* assume it's an internal op; set to LDAPv3 */
 489                 vers = LDAP_VERSION3;
 490         }
 491         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&vers );
 492
 493         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 494         ldap_set_option( ld, LDAP_OPT_REFERRALS,
 495                 LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 496
 497         if ( li->li_network_timeout > 0 ) {
 498                 struct timeval          tv;
 499
 500                 tv.tv_sec = li->li_network_timeout;
 501                 tv.tv_usec = 0;
 502                 ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
 503         }
 504
 505 #ifdef HAVE_TLS
 506         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 507                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 508         if ( rs->sr_err != LDAP_SUCCESS ) {
 509                 ldap_unbind_ext( ld, NULL, NULL );
 510                 goto error_return;
 511         }
 512 #endif /* HAVE_TLS */
 513
 514         if ( *lcp == NULL ) {
 515                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 516                 (*lcp)->lc_flags= li->li_flags;
 517         }
 518         (*lcp)->lc_ld = ld;
 519         (*lcp)->lc_refcnt = 1;
 520         (*lcp)->lc_binding = 1;
 521 #ifdef HAVE_TLS
 522         if ( is_tls ) {
 523                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 524         } else {
 525                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 526         }
 527 #endif /* HAVE_TLS */
 528
 529 error_return:;
 530         if ( rs->sr_err != LDAP_SUCCESS ) {
 531                 rs->sr_err = slap_map_api2result( rs );
 532                 if ( sendok & LDAP_BACK_SENDERR ) {
 533                         if ( rs->sr_text == NULL ) {
 534                                 rs->sr_text = "ldap_initialize() failed";
 535                         }
 536                         send_ldap_result( op, rs );
 537                         rs->sr_text = NULL;
 538                 }
 539
 540         } else {
 541                 if ( li->li_conn_ttl > 0 ) {
 542                         (*lcp)->lc_create_time = op->o_time;
 543                 }
 544         }
 545
 546         return rs->sr_err;
 547 }
 548
 549 ldapconn_t *
 550 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 551 {
 552         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 553         ldapconn_t      *lc = NULL,
 554                         lc_curr = { 0 };
 555         int             refcnt = 1, binding = 1;
 556
 557         /* Internal searches are privileged and shared. So is root. */
 558         if ( op->o_do_not_cache || be_isroot( op ) ) {
 559                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 560                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 561                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 562
 563         } else {
 564                 lc_curr.lc_local_ndn = op->o_ndn;
 565                 /* Explicit binds must not be shared */
 566                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 567                         lc_curr.lc_conn = op->o_conn;
 568
 569                 } else {
 570                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 571                 }
 572         }
 573
 574         /* Explicit Bind requests always get their own conn */
 575         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 576                 /* Searches for a ldapconn in the avl tree */
 577 retry_lock:
 578                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 579
 580                 lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 581                                 (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 582                 if ( lc != NULL ) {
 583                         /* Don't reuse connections while they're still binding */
 584                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 585                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 586                                 ldap_pvt_thread_yield();
 587                                 goto retry_lock;
 588                         }
 589                         refcnt = ++lc->lc_refcnt;
 590                         binding = ++lc->lc_binding;
 591                 }
 592                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 593         }
 594
 595         /* Looks like we didn't get a bind. Open a new session... */
 596         if ( lc == NULL ) {
 597                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 598                         return NULL;
 599                 }
 600                 if ( sendok & LDAP_BACK_BINDING ) {
 601                         LDAP_BACK_CONN_BINDING_SET( lc );
 602                 }
 603                 lc->lc_conn = lc_curr.lc_conn;
 604                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 605
 606                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 607                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 608                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 609                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 610
 611                 } else {
 612                         BER_BVZERO( &lc->lc_cred );
 613                         BER_BVZERO( &lc->lc_bound_ndn );
 614 #if 0
 615                         /* FIXME: if we set lc_bound_ndn = o_ndn
 616                          * we end up with a bind with DN but no password! */
 617                         if ( !BER_BVISEMPTY( &op->o_ndn )
 618                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 619                         {
 620                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 621                         }
 622 #endif
 623                 }
 624
 625 #ifdef HAVE_TLS
 626                 /* if start TLS failed but it was not mandatory,
 627                  * check if the non-TLS connection was already
 628                  * in cache; in case, destroy the newly created
 629                  * connection and use the existing one */
 630                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 631                                 && !ldap_tls_inplace( lc->lc_ld ) )
 632                 {
 633                         ldapconn_t *tmplc;
 634
 635                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 636                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 637                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 638                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 639                         if ( tmplc != NULL ) {
 640                                 refcnt = ++tmplc->lc_refcnt;
 641                                 binding = ++tmplc->lc_binding;
 642                                 ldap_back_conn_free( lc );
 643                                 lc = tmplc;
 644                         }
 645                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 646
 647                         if ( tmplc != NULL ) {
 648                                 goto done;
 649                         }
 650                 }
 651 #endif /* HAVE_TLS */
 652
 653                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 654
 655                 /* Inserts the newly created ldapconn in the avl tree */
 656                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 657
 658                 assert( lc->lc_refcnt == 1 );
 659                 assert( lc->lc_binding == 1 );
 660                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 661                         ldap_back_conndn_cmp, ldap_back_conndn_dup );
 662
 663 #if PRINT_CONNTREE > 0
 664                 myprint( li->li_conninfo.lai_tree );
 665 #endif /* PRINT_CONNTREE */
 666
 667                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 668
 669                 Debug( LDAP_DEBUG_TRACE,
 670                         "=>ldap_back_getconn: conn %p inserted refcnt=%u binding=%u\n",
 671                         (void *)lc, refcnt, binding );
 672
 673                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 674                 switch ( rs->sr_err ) {
 675                 case 0:
 676                         break;
 677
 678                 case -1:
 679                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 680                                 /* duplicate: free and try to get the newly created one */
 681                                 goto retry_lock;
 682                         }
 683                         /* taint connection, so that it'll be freed when released */
 684                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 685                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 686                                         ldap_back_conndnlc_cmp );
 687                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 688                         LDAP_BACK_CONN_TAINTED_SET( lc );
 689                         break;
 690
 691                 default:
 692                         ldap_back_conn_free( lc );
 693                         rs->sr_err = LDAP_OTHER;
 694                         rs->sr_text = "proxy bind collision";
 695                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 696                                 send_ldap_result( op, rs );
 697                                 rs->sr_text = NULL;
 698                         }
 699                         return NULL;
 700                 }
 701
 702         } else {
 703                 char    buf[ SLAP_TEXT_BUFLEN ];
 704                 int     expiring = 0;
 705
 706                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
 707                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
 708                 {
 709                         expiring = 1;
 710
 711                         /* let it be used, but taint/delete it so that
 712                          * no-one else can look it up any further */
 713                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 714                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 715                                         ldap_back_conndnlc_cmp );
 716                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 717                         LDAP_BACK_CONN_TAINTED_SET( lc );
 718                 }
 719
 720                 {
 721                         snprintf( buf, sizeof( buf ),
 722                                 "conn %p fetched refcnt=%u binding=%u%s",
 723                                 (void *)lc, refcnt, binding, expiring ? " expiring" : "" );
 724                         Debug( LDAP_DEBUG_TRACE,
 725                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
 726                 }
 727
 728         }
 729
 730 #ifdef HAVE_TLS
 731 done:;
 732 #endif /* HAVE_TLS */
 733         if ( li->li_idle_timeout && lc ) {
 734                 lc->lc_time = op->o_time;
 735         }
 736
 737         return lc;
 738 }
 739
 740 void
 741 ldap_back_release_conn_lock(
 742         Operation               *op,
 743         SlapReply               *rs,
 744         ldapconn_t              *lc,
 745         int                     dolock )
 746 {
 747         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 748
 749         if ( dolock ) {
 750                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 751         }
 752         assert( lc->lc_refcnt > 0 );
 753         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 754         lc->lc_refcnt--;
 755         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
 756                 ldap_back_freeconn( op, lc, 0 );
 757         }
 758         if ( dolock ) {
 759                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 760         }
 761 }
 762
 763 /*
 764  * ldap_back_dobind
 765  *
 766  * Note: as the check for the value of lc->lc_bound was already here, I removed
 767  * it from all the callers, and I made the function return the flag, so
 768  * it can be used to simplify the check.
 769  *
 770  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 771  */
 772 static int
 773 ldap_back_dobind_int(
 774         ldapconn_t              *lc,
 775         Operation               *op,
 776         SlapReply               *rs,
 777         ldap_back_send_t        sendok,
 778         int                     retries,
 779         int                     dolock )
 780 {
 781         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 782
 783         int             rc, binding = 0;
 784         ber_int_t       msgid;
 785
 786         assert( retries >= 0 );
 787
 788 retry_lock:;
 789         if ( dolock ) {
 790                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 791         }
 792
 793         if ( binding == 0 ) {
 794                 /* check if already bound */
 795                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 796                 if ( rc ) {
 797                         lc->lc_binding--;
 798                         if ( dolock ) {
 799                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 800                         }
 801                         return rc;
 802                 }
 803
 804                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 805                         /* if someone else is about to bind it, give up and retry */
 806                         if ( dolock ) {
 807                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 808                         }
 809                         ldap_pvt_thread_yield();
 810                         goto retry_lock;
 811
 812                 } else {
 813                         /* otherwise this thread will bind it */
 814                         LDAP_BACK_CONN_BINDING_SET( lc );
 815                         binding = 1;
 816                 }
 817         }
 818
 819         /* wait for pending operations to finish */
 820         /* FIXME: may become a bottleneck! */
 821         if ( lc->lc_refcnt != lc->lc_binding ) {
 822                 if ( dolock ) {
 823                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 824                 }
 825                 ldap_pvt_thread_yield();
 826                 goto retry_lock;
 827         }
 828
 829         if ( dolock ) {
 830                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 831         }
 832
 833 #if 0
 834         while ( lc->lc_refcnt > 1 ) {
 835                 ldap_pvt_thread_yield();
 836                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 837                 if ( rc ) {
 838                         return rc;
 839                 }
 840         }
 841
 842         if ( dolock ) {
 843                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 844         }
 845         LDAP_BACK_CONN_BINDING_SET( lc );
 846         if ( dolock ) {
 847                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 848         }
 849 #endif
 850
 851         /*
 852          * FIXME: we need to let clients use proxyAuthz
 853          * otherwise we cannot do symmetric pools of servers;
 854          * we have to live with the fact that a user can
 855          * authorize itself as any ID that is allowed
 856          * by the authzTo directive of the "proxyauthzdn".
 857          */
 858         /*
 859          * NOTE: current Proxy Authorization specification
 860          * and implementation do not allow proxy authorization
 861          * control to be provided with Bind requests
 862          */
 863         /*
 864          * if no bind took place yet, but the connection is bound
 865          * and the "idassert-authcDN" (or other ID) is set,
 866          * then bind as the asserting identity and explicitly
 867          * add the proxyAuthz control to every operation with the
 868          * dn bound to the connection as control value.
 869          * This is done also if this is the authrizing backend,
 870          * but the "override" flag is given to idassert.
 871          * It allows to use SASL bind and yet proxyAuthz users
 872          */
 873         if ( op->o_conn != NULL &&
 874                         !op->o_do_not_cache &&
 875                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 876                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 877         {
 878                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok );
 879                 goto done;
 880         }
 881
 882 #ifdef HAVE_CYRUS_SASL
 883         if ( LDAP_BACK_CONN_ISPRIV( lc )
 884                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 885         {
 886                 void            *defaults = NULL;
 887
 888                 if ( li->li_acl_secprops != NULL ) {
 889                         rc = ldap_set_option( lc->lc_ld,
 890                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 891
 892                         if ( rc != LDAP_OPT_SUCCESS ) {
 893                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 894                                         "(%s,SECPROPS,\"%s\") failed!\n",
 895                                         li->li_uri, li->li_acl_secprops, 0 );
 896                                 goto done;
 897                         }
 898                 }
 899
 900                 defaults = lutil_sasl_defaults( lc->lc_ld,
 901                                 li->li_acl_sasl_mech.bv_val,
 902                                 li->li_acl_sasl_realm.bv_val,
 903                                 li->li_acl_authcID.bv_val,
 904                                 li->li_acl_passwd.bv_val,
 905                                 NULL );
 906
 907                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 908                                 li->li_acl_authcDN.bv_val,
 909                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 910                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 911                                 defaults );
 912
 913                 lutil_sasl_freedefs( defaults );
 914
 915                 rs->sr_err = slap_map_api2result( rs );
 916                 if ( rs->sr_err != LDAP_SUCCESS ) {
 917                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 918                         send_ldap_result( op, rs );
 919
 920                 } else {
 921                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 922                 }
 923                 goto done;
 924         }
 925 #endif /* HAVE_CYRUS_SASL */
 926
 927 retry:;
 928         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 929                         lc->lc_bound_ndn.bv_val,
 930                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 931                         NULL, NULL, &msgid );
 932
 933         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 934                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 935                         if ( dolock ) {
 936                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 937                         }
 938
 939                         assert( lc->lc_refcnt > 0 );
 940                         if ( lc->lc_refcnt == 1 ) {
 941                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 942                                 lc->lc_ld = NULL;
 943
 944                                 /* lc here must be the regular lc, reset and ready for init */
 945                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 946                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 947                                         lc->lc_binding--;
 948                                         lc->lc_refcnt = 0;
 949                                 }
 950                         }
 951
 952                         if ( dolock ) {
 953                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 954                         }
 955
 956                         if ( rs->sr_err == LDAP_SUCCESS ) {
 957                                 if ( retries > 0 ) {
 958                                         retries--;
 959                                 }
 960                                 goto retry;
 961                         }
 962
 963                 } else {
 964                         if ( dolock ) {
 965                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 966                         }
 967                         lc->lc_binding--;
 968                         if ( dolock ) {
 969                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 970                         }
 971                 }
 972
 973                 ldap_back_freeconn( op, lc, dolock );
 974                 rs->sr_err = slap_map_api2result( rs );
 975
 976                 return 0;
 977         }
 978
 979         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
 980         if ( rc == LDAP_SUCCESS ) {
 981                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 982         }
 983
 984 done:;
 985         lc->lc_binding--;
 986         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 987         rc = LDAP_BACK_CONN_ISBOUND( lc );
 988         if ( !rc ) {
 989                 ldap_back_release_conn_lock( op, rs, lc, dolock );
 990         }
 991
 992         return rc;
 993 }
 994
 995 int
 996 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 997 {
 998         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 999
1000         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
1001 }
1002
1003 /*
1004  * ldap_back_default_rebind
1005  *
1006  * This is a callback used for chasing referrals using the same
1007  * credentials as the original user on this session.
1008  */
1009 static int
1010 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1011         ber_int_t msgid, void *params )
1012 {
1013         ldapconn_t      *lc = (ldapconn_t *)params;
1014
1015 #ifdef HAVE_TLS
1016         /* ... otherwise we couldn't get here */
1017         assert( lc != NULL );
1018
1019         if ( !ldap_tls_inplace( ld ) ) {
1020                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1021                                 rc;
1022                 const char      *text = NULL;
1023
1024                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1025                         LDAP_BACK_RETRY_DEFAULT, &text );
1026                 if ( rc != LDAP_SUCCESS ) {
1027                         return rc;
1028                 }
1029         }
1030 #endif /* HAVE_TLS */
1031
1032         /* FIXME: add checks on the URL/identity? */
1033
1034         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
1035                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1036 }
1037
1038 int
1039 ldap_back_op_result(
1040                 ldapconn_t              *lc,
1041                 Operation               *op,
1042                 SlapReply               *rs,
1043                 ber_int_t               msgid,
1044                 time_t                  timeout,
1045                 ldap_back_send_t        sendok )
1046 {
1047         char            *match = NULL;
1048         LDAPMessage     *res = NULL;
1049         char            *text = NULL;
1050
1051 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1052
1053         rs->sr_text = NULL;
1054         rs->sr_matched = NULL;
1055
1056         /* if the error recorded in the reply corresponds
1057          * to a successful state, get the error from the
1058          * remote server response */
1059         if ( ERR_OK( rs->sr_err ) ) {
1060                 int             rc;
1061                 struct timeval  tv;
1062
1063                 if ( timeout ) {
1064                         tv.tv_sec = timeout;
1065                         tv.tv_usec = 0;
1066
1067                 } else {
1068                         LDAP_BACK_TV_SET( &tv );
1069                 }
1070
1071 retry:;
1072                 /* if result parsing fails, note the failure reason */
1073                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1074                 switch ( rc ) {
1075                 case 0:
1076                         if ( timeout ) {
1077                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1078                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
1079                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
1080                                 rs->sr_text = "Operation timed out";
1081                                 break;
1082                         }
1083
1084                         LDAP_BACK_TV_SET( &tv );
1085                         ldap_pvt_thread_yield();
1086                         goto retry;
1087
1088                 case -1:
1089                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1090                                         &rs->sr_err );
1091                         break;
1092
1093
1094                 /* otherwise get the result; if it is not
1095                  * LDAP_SUCCESS, record it in the reply
1096                  * structure (this includes
1097                  * LDAP_COMPARE_{TRUE|FALSE}) */
1098                 default:
1099                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1100                                         &match, &text, NULL, NULL, 1 );
1101 #ifndef LDAP_NULL_IS_NULL
1102                         if ( match != NULL && match[ 0 ] == '\0' ) {
1103                                 ldap_memfree( match );
1104                                 match = NULL;
1105                         }
1106                         if ( text != NULL && text[ 0 ] == '\0' ) {
1107                                 ldap_memfree( text );
1108                                 text = NULL;
1109                         }
1110 #endif /* LDAP_NULL_IS_NULL */
1111                         rs->sr_text = text;
1112                         if ( rc != LDAP_SUCCESS ) {
1113                                 rs->sr_err = rc;
1114                         }
1115                 }
1116         }
1117
1118         /* if the error in the reply structure is not
1119          * LDAP_SUCCESS, try to map it from client
1120          * to server error */
1121         if ( !ERR_OK( rs->sr_err ) ) {
1122                 rs->sr_err = slap_map_api2result( rs );
1123
1124                 /* internal ops ( op->o_conn == NULL )
1125                  * must not reply to client */
1126                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1127
1128                         /* record the (massaged) matched
1129                          * DN into the reply structure */
1130                         rs->sr_matched = match;
1131                 }
1132         }
1133         if ( op->o_conn &&
1134                         ( ( sendok & LDAP_BACK_SENDOK )
1135                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1136         {
1137                 send_ldap_result( op, rs );
1138         }
1139         if ( match ) {
1140                 if ( rs->sr_matched != match ) {
1141                         free( (char *)rs->sr_matched );
1142                 }
1143                 rs->sr_matched = NULL;
1144                 ldap_memfree( match );
1145         }
1146         if ( text ) {
1147                 ldap_memfree( text );
1148         }
1149         rs->sr_text = NULL;
1150         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1151 }
1152
1153 /* return true if bound, false if failed */
1154 int
1155 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1156 {
1157         int             rc = 0;
1158         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1159
1160         assert( lcp != NULL );
1161         assert( *lcp != NULL );
1162
1163         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1164
1165         if ( (*lcp)->lc_refcnt == 1 ) {
1166                 Debug( LDAP_DEBUG_ANY,
1167                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1168                         op->o_log_prefix, li->li_uri,
1169                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1170                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1171
1172                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1173                 (*lcp)->lc_ld = NULL;
1174                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1175
1176                 /* lc here must be the regular lc, reset and ready for init */
1177                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1178                 if ( rc != LDAP_SUCCESS ) {
1179                         rc = 0;
1180                         *lcp = NULL;
1181
1182                 } else {
1183                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1184                         if ( rc == 0 ) {
1185                                 *lcp = NULL;
1186                         }
1187                 }
1188
1189         } else {
1190                 Debug( LDAP_DEBUG_TRACE,
1191                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1192                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1193
1194                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1195                 *lcp = NULL;
1196
1197                 if ( sendok ) {
1198                         rs->sr_err = LDAP_UNAVAILABLE;
1199                         rs->sr_text = "unable to retry";
1200                         send_ldap_result( op, rs );
1201                 }
1202         }
1203
1204         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1205
1206         return rc;
1207 }
1208
1209 static int
1210 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1211 {
1212         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1213         struct berval   binddn = slap_empty_bv;
1214         struct berval   bindcred = slap_empty_bv;
1215         struct berval   ndn;
1216         int             dobind = 0;
1217         int             msgid;
1218         int             rc;
1219
1220         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1221                 ndn = op->o_conn->c_ndn;
1222
1223         } else {
1224                 ndn = op->o_ndn;
1225         }
1226
1227         /*
1228          * FIXME: we need to let clients use proxyAuthz
1229          * otherwise we cannot do symmetric pools of servers;
1230          * we have to live with the fact that a user can
1231          * authorize itself as any ID that is allowed
1232          * by the authzTo directive of the "proxyauthzdn".
1233          */
1234         /*
1235          * NOTE: current Proxy Authorization specification
1236          * and implementation do not allow proxy authorization
1237          * control to be provided with Bind requests
1238          */
1239         /*
1240          * if no bind took place yet, but the connection is bound
1241          * and the "proxyauthzdn" is set, then bind as
1242          * "proxyauthzdn" and explicitly add the proxyAuthz
1243          * control to every operation with the dn bound
1244          * to the connection as control value.
1245          */
1246
1247         /* bind as proxyauthzdn only if no idassert mode
1248          * is requested, or if the client's identity
1249          * is authorized */
1250         switch ( li->li_idassert_mode ) {
1251         case LDAP_BACK_IDASSERT_LEGACY:
1252                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1253                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1254                         {
1255                                 binddn = li->li_idassert_authcDN;
1256                                 bindcred = li->li_idassert_passwd;
1257                                 dobind = 1;
1258                         }
1259                 }
1260                 break;
1261
1262         default:
1263                 /* NOTE: rootdn can always idassert */
1264                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1265                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1266                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1267                                 if ( sendok & LDAP_BACK_SENDERR ) {
1268                                         send_ldap_result( op, rs );
1269                                 }
1270                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1271
1272                         } else {
1273                                 rs->sr_err = LDAP_SUCCESS;
1274                                 binddn = slap_empty_bv;
1275                                 bindcred = slap_empty_bv;
1276                                 break;
1277                         }
1278
1279                         goto done;
1280
1281                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1282                         struct berval authcDN;
1283
1284                         if ( BER_BVISNULL( &ndn ) ) {
1285                                 authcDN = slap_empty_bv;
1286
1287                         } else {
1288                                 authcDN = ndn;
1289                         }
1290                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1291                                         &authcDN, &authcDN );
1292                         if ( rs->sr_err != LDAP_SUCCESS ) {
1293                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1294                                         if ( sendok & LDAP_BACK_SENDERR ) {
1295                                                 send_ldap_result( op, rs );
1296                                         }
1297                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1298
1299                                 } else {
1300                                         rs->sr_err = LDAP_SUCCESS;
1301                                         binddn = slap_empty_bv;
1302                                         bindcred = slap_empty_bv;
1303                                         break;
1304                                 }
1305
1306                                 goto done;
1307                         }
1308                 }
1309
1310                 binddn = li->li_idassert_authcDN;
1311                 bindcred = li->li_idassert_passwd;
1312                 dobind = 1;
1313                 break;
1314         }
1315
1316         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1317 #ifdef HAVE_CYRUS_SASL
1318                 void            *defaults = NULL;
1319                 struct berval   authzID = BER_BVNULL;
1320                 int             freeauthz = 0;
1321
1322                 /* if SASL supports native authz, prepare for it */
1323                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1324                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1325                 {
1326                         switch ( li->li_idassert_mode ) {
1327                         case LDAP_BACK_IDASSERT_OTHERID:
1328                         case LDAP_BACK_IDASSERT_OTHERDN:
1329                                 authzID = li->li_idassert_authzID;
1330                                 break;
1331
1332                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1333                                 BER_BVSTR( &authzID, "dn:" );
1334                                 break;
1335
1336                         case LDAP_BACK_IDASSERT_SELF:
1337                                 if ( BER_BVISNULL( &ndn ) ) {
1338                                         /* connection is not authc'd, so don't idassert */
1339                                         BER_BVSTR( &authzID, "dn:" );
1340                                         break;
1341                                 }
1342                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1343                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1344                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1345                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1346                                                 ndn.bv_val, ndn.bv_len + 1 );
1347                                 freeauthz = 1;
1348                                 break;
1349
1350                         default:
1351                                 break;
1352                         }
1353                 }
1354
1355                 if ( li->li_idassert_secprops != NULL ) {
1356                         rs->sr_err = ldap_set_option( lc->lc_ld,
1357                                 LDAP_OPT_X_SASL_SECPROPS,
1358                                 (void *)li->li_idassert_secprops );
1359
1360                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1361                                 rs->sr_err = LDAP_OTHER;
1362                                 if ( sendok & LDAP_BACK_SENDERR ) {
1363                                         send_ldap_result( op, rs );
1364                                 }
1365                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1366                                 goto done;
1367                         }
1368                 }
1369
1370                 defaults = lutil_sasl_defaults( lc->lc_ld,
1371                                 li->li_idassert_sasl_mech.bv_val,
1372                                 li->li_idassert_sasl_realm.bv_val,
1373                                 li->li_idassert_authcID.bv_val,
1374                                 li->li_idassert_passwd.bv_val,
1375                                 authzID.bv_val );
1376
1377                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1378                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1379                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1380                                 defaults );
1381
1382                 rs->sr_err = slap_map_api2result( rs );
1383                 if ( rs->sr_err != LDAP_SUCCESS ) {
1384                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1385                         if ( sendok & LDAP_BACK_SENDERR ) {
1386                                 send_ldap_result( op, rs );
1387                         }
1388
1389                 } else {
1390                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1391                 }
1392
1393                 lutil_sasl_freedefs( defaults );
1394                 if ( freeauthz ) {
1395                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1396                 }
1397
1398                 goto done;
1399 #endif /* HAVE_CYRUS_SASL */
1400         }
1401
1402         switch ( li->li_idassert_authmethod ) {
1403         case LDAP_AUTH_NONE:
1404                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1405                 goto done;
1406
1407         case LDAP_AUTH_SIMPLE:
1408                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1409                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1410                                 &bindcred, NULL, NULL, &msgid );
1411                 break;
1412
1413         default:
1414                 /* unsupported! */
1415                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1416                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1417                 if ( sendok & LDAP_BACK_SENDERR ) {
1418                         send_ldap_result( op, rs );
1419                 }
1420                 goto done;
1421         }
1422
1423         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1424         if ( rc == LDAP_SUCCESS ) {
1425                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1426         }
1427 done:;
1428         return LDAP_BACK_CONN_ISBOUND( lc );
1429 }
1430
1431 /*
1432  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1433  * to existing server-side controls if required; if not,
1434  * the existing server-side controls are placed in *pctrls.
1435  * The caller, after using the controls in client API
1436  * operations, if ( *pctrls != op->o_ctrls ), should
1437  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1438  * The function returns success if the control could
1439  * be added if required, or if it did nothing; in the future,
1440  * it might return some error if it failed.
1441  *
1442  * if no bind took place yet, but the connection is bound
1443  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1444  * and explicitly add proxyAuthz the control to every operation
1445  * with the dn bound to the connection as control value.
1446  *
1447  * If no server-side controls are defined for the operation,
1448  * simply add the proxyAuthz control; otherwise, if the
1449  * proxyAuthz control is not already set, add it as
1450  * the first one
1451  *
1452  * FIXME: is controls order significant for security?
1453  * ANSWER: controls ordering and interoperability
1454  * must be indicated by the specs of each control; if none
1455  * is specified, the order is irrelevant.
1456  */
1457 int
1458 ldap_back_proxy_authz_ctrl(
1459                 ldapconn_t      *lc,
1460                 Operation       *op,
1461                 SlapReply       *rs,
1462                 LDAPControl     ***pctrls )
1463 {
1464         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1465         LDAPControl     **ctrls = NULL;
1466         int             i = 0,
1467                         mode;
1468         struct berval   assertedID,
1469                         ndn;
1470
1471         *pctrls = NULL;
1472
1473         rs->sr_err = LDAP_SUCCESS;
1474
1475         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1476          * but if it is not set this test fails.  We need a different
1477          * means to detect if idassert is enabled */
1478         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1479                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1480         {
1481                 goto done;
1482         }
1483
1484         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1485                 goto done;
1486         }
1487
1488         if ( op->o_tag == LDAP_REQ_BIND ) {
1489                 ndn = op->o_req_ndn;
1490
1491         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1492                 ndn = op->o_conn->c_ndn;
1493
1494         } else {
1495                 ndn = op->o_ndn;
1496         }
1497
1498         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1499                 if ( op->o_proxy_authz ) {
1500                         /*
1501                          * FIXME: we do not want to perform proxyAuthz
1502                          * on behalf of the client, because this would
1503                          * be performed with "proxyauthzdn" privileges.
1504                          *
1505                          * This might actually be too strict, since
1506                          * the "proxyauthzdn" authzTo, and each entry's
1507                          * authzFrom attributes may be crafted
1508                          * to avoid unwanted proxyAuthz to take place.
1509                          */
1510 #if 0
1511                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1512                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1513 #endif
1514                         goto done;
1515                 }
1516
1517                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1518                         goto done;
1519                 }
1520
1521                 if ( BER_BVISNULL( &ndn ) ) {
1522                         goto done;
1523                 }
1524
1525                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1526                         goto done;
1527                 }
1528
1529         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1530                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1531                                 /* && ( !BER_BVISNULL( &ndn )
1532                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1533                 {
1534                         /* already asserted in SASL via native authz */
1535                         /* NOTE: the test on lc->lc_bound is used to trap
1536                          * native authorization of anonymous users,
1537                          * since in that case ndn is NULL */
1538                         goto done;
1539                 }
1540
1541         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1542                 int             rc;
1543                 struct berval authcDN;
1544
1545                 if ( BER_BVISNULL( &ndn ) ) {
1546                         authcDN = slap_empty_bv;
1547                 } else {
1548                         authcDN = ndn;
1549                 }
1550                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1551                                 &authcDN, & authcDN );
1552                 if ( rc != LDAP_SUCCESS ) {
1553                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1554                         {
1555                                 /* ndn is not authorized
1556                                  * to use idassert */
1557                                 rs->sr_err = rc;
1558                         }
1559                         goto done;
1560                 }
1561         }
1562
1563         if ( op->o_proxy_authz ) {
1564                 /*
1565                  * FIXME: we can:
1566                  * 1) ignore the already set proxyAuthz control
1567                  * 2) leave it in place, and don't set ours
1568                  * 3) add both
1569                  * 4) reject the operation
1570                  *
1571                  * option (4) is very drastic
1572                  * option (3) will make the remote server reject
1573                  * the operation, thus being equivalent to (4)
1574                  * option (2) will likely break the idassert
1575                  * assumptions, so we cannot accept it;
1576                  * option (1) means that we are contradicting
1577                  * the client's reques.
1578                  *
1579                  * I think (4) is the only correct choice.
1580                  */
1581                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1582                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1583         }
1584
1585         if ( op->o_is_auth_check ) {
1586                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1587
1588         } else {
1589                 mode = li->li_idassert_mode;
1590         }
1591
1592         switch ( mode ) {
1593         case LDAP_BACK_IDASSERT_SELF:
1594                 if ( BER_BVISNULL( &ndn ) ) {
1595                         goto done;
1596                 }
1597                 assertedID = ndn;
1598                 break;
1599
1600         case LDAP_BACK_IDASSERT_LEGACY:
1601                 /* original behavior:
1602                  * assert the client's identity */
1603                 if ( BER_BVISNULL( &ndn ) ) {
1604                         assertedID = slap_empty_bv;
1605                 } else {
1606                         assertedID = ndn;
1607                 }
1608                 break;
1609
1610         case LDAP_BACK_IDASSERT_ANONYMOUS:
1611                 /* assert "anonymous" */
1612                 assertedID = slap_empty_bv;
1613                 break;
1614
1615         case LDAP_BACK_IDASSERT_NOASSERT:
1616                 /* don't assert; bind as proxyauthzdn */
1617                 goto done;
1618
1619         case LDAP_BACK_IDASSERT_OTHERID:
1620         case LDAP_BACK_IDASSERT_OTHERDN:
1621                 /* assert idassert DN */
1622                 assertedID = li->li_idassert_authzID;
1623                 break;
1624
1625         default:
1626                 assert( 0 );
1627         }
1628
1629         if ( BER_BVISNULL( &assertedID ) ) {
1630                 assertedID = slap_empty_bv;
1631         }
1632
1633         /* don't idassert the bound DN (ITS#4497) */
1634         if ( dn_match( &assertedID, &lc->lc_bound_ndn ) ) {
1635                 goto done;
1636         }
1637
1638         if ( op->o_ctrls ) {
1639                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1640                         /* just count ctrls */ ;
1641         }
1642
1643         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1644                         op->o_tmpmemctx );
1645         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1646
1647         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1648         ctrls[ 0 ]->ldctl_iscritical = 1;
1649
1650         switch ( li->li_idassert_mode ) {
1651         /* already in u:ID or dn:DN form */
1652         case LDAP_BACK_IDASSERT_OTHERID:
1653         case LDAP_BACK_IDASSERT_OTHERDN:
1654                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1655                 break;
1656
1657         /* needs the dn: prefix */
1658         default:
1659                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1660                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1661                                 op->o_tmpmemctx );
1662                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1663                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1664                                 assertedID.bv_val, assertedID.bv_len + 1 );
1665                 break;
1666         }
1667
1668         if ( op->o_ctrls ) {
1669                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1670                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1671                 }
1672         }
1673         ctrls[ i + 1 ] = NULL;
1674
1675 done:;
1676         if ( ctrls == NULL ) {
1677                 ctrls = op->o_ctrls;
1678         }
1679
1680         *pctrls = ctrls;
1681
1682         return rs->sr_err;
1683 }
1684
1685 int
1686 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1687 {
1688         LDAPControl     **ctrls = *pctrls;
1689
1690         /* we assume that the first control is the proxyAuthz
1691          * added by back-ldap, so it's the only one we explicitly
1692          * free */
1693         if ( ctrls && ctrls != op->o_ctrls ) {
1694                 assert( ctrls[ 0 ] != NULL );
1695
1696                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1697                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1698                 }
1699
1700                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
1701         }
1702
1703         *pctrls = NULL;
1704
1705         return 0;
1706 }