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 #undef ldap_debug       /* silence a warning in ldap-int.h */
  36 #include "../../../libraries/libldap/ldap-int.h"
  37
  38 #include "lutil_ldap.h"
  39
  40 #define LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ       "2.16.840.1.113730.3.4.12"
  41
  42 #if LDAP_BACK_PRINT_CONNTREE > 0
  43 static void
  44 ravl_print( Avlnode *root, int depth )
  45 {
  46         int             i;
  47         ldapconn_t      *lc;
  48
  49         if ( root == 0 ) {
  50                 return;
  51         }
  52
  53         ravl_print( root->avl_right, depth+1 );
  54
  55         for ( i = 0; i < depth; i++ ) {
  56                 fprintf( stderr, "-" );
  57         }
  58
  59         lc = root->avl_data;
  60         fprintf( stderr, "lc=%p local=\"%s\" conn=%p %s refcnt=%d\n",
  61                 (void *)lc,
  62                 lc->lc_local_ndn.bv_val ? lc->lc_local_ndn.bv_val : "",
  63                 (void *)lc->lc_conn,
  64                 avl_bf2str( root->avl_bf ), lc->lc_refcnt );
  65
  66         ravl_print( root->avl_left, depth+1 );
  67 }
  68
  69 void
  70 ldap_back_print_conntree( Avlnode *root, char *msg )
  71 {
  72         fprintf( stderr, "========> %s\n", msg );
  73
  74         if ( root == 0 ) {
  75                 fprintf( stderr, "\t(empty)\n" );
  76
  77         } else {
  78                 ravl_print( root, 0 );
  79         }
  80
  81         fprintf( stderr, "<======== %s\n", msg );
  82 }
  83 #endif /* LDAP_BACK_PRINT_CONNTREE */
  84
  85 static ldapconn_t *
  86 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok,
  87         struct berval *binddn, struct berval *bindcred );
  88
  89 static int
  90 ldap_back_is_proxy_authz( Operation *op, SlapReply *rs, ldap_back_send_t sendok,
  91         struct berval *binddn, struct berval *bindcred );
  92
  93 static int
  94 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs,
  95         ldap_back_send_t sendok, struct berval *binddn, struct berval *bindcred );
  96
  97 static int
  98 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs,
  99         ldap_back_send_t sendok );
 100
 101 static int
 102 ldap_back_conndnlc_cmp( const void *c1, const void *c2 );
 103
 104 int
 105 ldap_back_bind( Operation *op, SlapReply *rs )
 106 {
 107         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 108         ldapconn_t      *lc;
 109
 110         int rc = 0;
 111         ber_int_t msgid;
 112
 113         lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR, NULL, NULL );
 114         if ( !lc ) {
 115                 return rs->sr_err;
 116         }
 117
 118         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
 119                 ch_free( lc->lc_bound_ndn.bv_val );
 120                 BER_BVZERO( &lc->lc_bound_ndn );
 121         }
 122         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 123
 124         /* method is always LDAP_AUTH_SIMPLE if we got here */
 125         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
 126                         LDAP_SASL_SIMPLE,
 127                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
 128         rc = ldap_back_op_result( lc, op, rs, msgid,
 129                 li->li_timeout[ SLAP_OP_BIND ],
 130                 LDAP_BACK_BIND_SERR );
 131         if ( rc == LDAP_SUCCESS ) {
 132                 /* If defined, proxyAuthz will be used also when
 133                  * back-ldap is the authorizing backend; for this
 134                  * purpose, after a successful bind the connection
 135                  * is trashed and further operations will use
 136                  * a default connections with identity assertion */
 137                 /* NOTE: use with care */
 138                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
 139                         LDAP_BACK_CONN_TAINTED_SET( lc );
 140                         ldap_back_release_conn( op, rs, lc );
 141
 142                         return( rc );
 143                 }
 144
 145                 /* rebind is now done inside ldap_back_proxy_authz_bind()
 146                  * in case of success */
 147                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 148                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
 149
 150                 if ( LDAP_BACK_SAVECRED( li ) ) {
 151                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
 152                                 memset( lc->lc_cred.bv_val, 0,
 153                                                 lc->lc_cred.bv_len );
 154                         }
 155                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
 156                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
 157                 }
 158         }
 159
 160         assert( lc->lc_binding == 1 );
 161         lc->lc_binding = 0;
 162
 163         /* must re-insert if local DN changed as result of bind */
 164         if ( !LDAP_BACK_CONN_ISBOUND( lc )
 165                 || ( LDAP_BACK_CONN_ISBOUND( lc )
 166                         && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) )
 167         {
 168                 int             lerr = -1;
 169                 ldapconn_t      *tmplc;
 170
 171                 /* wait for all other ops to release the connection */
 172 retry_lock:;
 173                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 174                 if ( lc->lc_refcnt > 1 ) {
 175                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 176                         ldap_pvt_thread_yield();
 177                         goto retry_lock;
 178                 }
 179
 180 #if LDAP_BACK_PRINT_CONNTREE > 0
 181                 ldap_back_print_conntree( li->li_conninfo.lai_tree, ">>> ldap_back_bind" );
 182 #endif /* LDAP_BACK_PRINT_CONNTREE */
 183
 184                 assert( lc->lc_refcnt == 1 );
 185                 tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 186                                 ldap_back_conndnlc_cmp );
 187                 assert( tmplc == NULL || lc == tmplc );
 188
 189                 /* delete all cached connections with the current connection */
 190                 if ( LDAP_BACK_SINGLECONN( li ) ) {
 191                         while ( ( tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc, ldap_back_conn_cmp ) ) != NULL )
 192                         {
 193                                 Debug( LDAP_DEBUG_TRACE,
 194                                         "=>ldap_back_bind: destroying conn %ld (refcnt=%u)\n",
 195                                         LDAP_BACK_PCONN_ID( lc ), lc->lc_refcnt, 0 );
 196
 197                                 if ( tmplc->lc_refcnt != 0 ) {
 198                                         /* taint it */
 199                                         LDAP_BACK_CONN_TAINTED_SET( tmplc );
 200
 201                                 } else {
 202                                         /*
 203                                          * Needs a test because the handler may be corrupted,
 204                                          * and calling ldap_unbind on a corrupted header results
 205                                          * in a segmentation fault
 206                                          */
 207                                         ldap_back_conn_free( tmplc );
 208                                 }
 209                         }
 210                 }
 211
 212                 if ( LDAP_BACK_CONN_ISBOUND( lc ) ) {
 213                         ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 214                         if ( be_isroot_dn( op->o_bd, &op->o_req_ndn ) ) {
 215                                 lc->lc_conn = LDAP_BACK_PCONN_SET( op );
 216                         }
 217                         lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 218                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
 219                 }
 220
 221 #if LDAP_BACK_PRINT_CONNTREE > 0
 222                 ldap_back_print_conntree( li->li_conninfo.lai_tree, "<<< ldap_back_bind" );
 223 #endif /* LDAP_BACK_PRINT_CONNTREE */
 224
 225                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 226                 switch ( lerr ) {
 227                 case 0:
 228                         break;
 229
 230                 case -1:
 231                         /* duplicate; someone else successfully bound
 232                          * on the same connection with the same identity;
 233                          * we can do this because lc_refcnt == 1 */
 234                         ldap_back_conn_free( lc );
 235                         lc = NULL;
 236                 }
 237         }
 238
 239         if ( lc != NULL ) {
 240                 ldap_back_release_conn( op, rs, lc );
 241         }
 242
 243         return( rc );
 244 }
 245
 246 /*
 247  * ldap_back_conndn_cmp
 248  *
 249  * compares two ldapconn_t based on the value of the conn pointer
 250  * and of the local DN; used by avl stuff for insert, lookup
 251  * and direct delete
 252  */
 253 int
 254 ldap_back_conndn_cmp( const void *c1, const void *c2 )
 255 {
 256         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 257         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 258         int rc;
 259
 260         /* If local DNs don't match, it is definitely not a match */
 261         /* For shared sessions, conn is NULL. Only explicitly
 262          * bound sessions will have non-NULL conn.
 263          */
 264         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 265         if ( rc == 0 ) {
 266                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 267         }
 268
 269         return rc;
 270 }
 271
 272 /*
 273  * ldap_back_conndnlc_cmp
 274  *
 275  * compares two ldapconn_t based on the value of the conn pointer,
 276  * the local DN and the lc pointer; used by avl stuff for insert, lookup
 277  * and direct delete
 278  */
 279 static int
 280 ldap_back_conndnlc_cmp( const void *c1, const void *c2 )
 281 {
 282         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 283         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 284         int rc;
 285
 286         /* If local DNs don't match, it is definitely not a match */
 287         /* For shared sessions, conn is NULL. Only explicitly
 288          * bound sessions will have non-NULL conn.
 289          */
 290         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 291         if ( rc == 0 ) {
 292                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 293                 if ( rc == 0 ) {
 294                         rc = SLAP_PTRCMP( lc1, lc2 );
 295                 }
 296         }
 297
 298         return rc;
 299 }
 300
 301 /*
 302  * ldap_back_conn_cmp
 303  *
 304  * compares two ldapconn_t based on the value of the conn pointer;
 305  * used by avl stuff for delete of all conns with the same connid
 306  */
 307 int
 308 ldap_back_conn_cmp( const void *c1, const void *c2 )
 309 {
 310         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 311         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 312
 313         /* For shared sessions, conn is NULL. Only explicitly
 314          * bound sessions will have non-NULL conn.
 315          */
 316         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 317 }
 318
 319 /*
 320  * ldap_back_conndn_dup
 321  *
 322  * returns -1 in case a duplicate ldapconn_t has been inserted;
 323  * used by avl stuff
 324  */
 325 int
 326 ldap_back_conndn_dup( void *c1, void *c2 )
 327 {
 328         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 329         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 330
 331         /* Cannot have more than one shared session with same DN */
 332         if ( lc1->lc_conn == lc2->lc_conn &&
 333                 dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) )
 334         {
 335                 return -1;
 336         }
 337
 338         return 0;
 339 }
 340
 341 int
 342 ldap_back_freeconn( Operation *op, ldapconn_t *lc, int dolock )
 343 {
 344         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 345         ldapconn_t      *tmplc;
 346
 347         if ( dolock ) {
 348                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 349         }
 350
 351 #if LDAP_BACK_PRINT_CONNTREE > 0
 352         ldap_back_print_conntree( li->li_conninfo.lai_tree, ">>> ldap_back_freeconn" );
 353 #endif /* LDAP_BACK_PRINT_CONNTREE */
 354
 355         tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 356                         ldap_back_conndnlc_cmp );
 357         assert( LDAP_BACK_CONN_TAINTED( lc ) || tmplc == lc );
 358         if ( lc->lc_refcnt == 0 ) {
 359                 ldap_back_conn_free( (void *)lc );
 360         }
 361
 362 #if LDAP_BACK_PRINT_CONNTREE > 0
 363         ldap_back_print_conntree( li->li_conninfo.lai_tree, "<<< ldap_back_freeconn" );
 364 #endif /* LDAP_BACK_PRINT_CONNTREE */
 365
 366         if ( dolock ) {
 367                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 368         }
 369
 370         return 0;
 371 }
 372
 373 #ifdef HAVE_TLS
 374 static int
 375 ldap_back_start_tls(
 376         LDAP            *ld,
 377         int             protocol,
 378         int             *is_tls,
 379         const char      *url,
 380         unsigned        flags,
 381         int             retries,
 382         const char      **text )
 383 {
 384         int             rc = LDAP_SUCCESS;
 385         ldapinfo_t      dummy;
 386
 387         /* this is ridiculous... */
 388         dummy.li_flags = flags;
 389
 390         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 391         if ( ( LDAP_BACK_USE_TLS( &dummy ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &dummy ) ) )
 392                                 && !ldap_is_ldaps_url( url ) )
 393         {
 394 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 395                 /*
 396                  * use asynchronous StartTLS
 397                  * in case, chase referral (not implemented yet)
 398                  */
 399                 int             msgid;
 400
 401                 if ( protocol == 0 ) {
 402                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 403                                         (void *)&protocol );
 404                 }
 405
 406                 if ( protocol < LDAP_VERSION3 ) {
 407                         /* we should rather bail out... */
 408                         rc = LDAP_UNWILLING_TO_PERFORM;
 409                         *text = "invalid protocol version";
 410                 }
 411
 412                 if ( rc == LDAP_SUCCESS ) {
 413                         rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 414                 }
 415
 416                 if ( rc == LDAP_SUCCESS ) {
 417                         LDAPMessage     *res = NULL;
 418                         struct timeval  tv;
 419
 420                         LDAP_BACK_TV_SET( &tv );
 421
 422 retry:;
 423                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 424                         if ( rc < 0 ) {
 425                                 rc = LDAP_UNAVAILABLE;
 426
 427                         } else if ( rc == 0 ) {
 428                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 429                                         ldap_pvt_thread_yield();
 430                                         if ( retries > 0 ) {
 431                                                 retries--;
 432                                         }
 433                                         LDAP_BACK_TV_SET( &tv );
 434                                         goto retry;
 435                                 }
 436                                 rc = LDAP_UNAVAILABLE;
 437
 438                         } else if ( rc == LDAP_RES_EXTENDED ) {
 439                                 struct berval   *data = NULL;
 440
 441                                 rc = ldap_parse_extended_result( ld, res,
 442                                                 NULL, &data, 0 );
 443                                 if ( rc == LDAP_SUCCESS ) {
 444                                         int err;
 445                                         rc = ldap_parse_result( ld, res, &err,
 446                                                 NULL, NULL, NULL, NULL, 1 );
 447                                         if ( rc == LDAP_SUCCESS ) {
 448                                                 rc = err;
 449                                         }
 450                                         res = NULL;
 451
 452                                         /* FIXME: in case a referral
 453                                          * is returned, should we try
 454                                          * using it instead of the
 455                                          * configured URI? */
 456                                         if ( rc == LDAP_SUCCESS ) {
 457                                                 rc = ldap_install_tls( ld );
 458
 459                                         } else if ( rc == LDAP_REFERRAL ) {
 460                                                 rc = LDAP_UNWILLING_TO_PERFORM;
 461                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 462                                         }
 463
 464                                         if ( data ) {
 465                                                 if ( data->bv_val ) {
 466                                                         ber_memfree( data->bv_val );
 467                                                 }
 468                                                 ber_memfree( data );
 469                                         }
 470                                 }
 471
 472                         } else {
 473                                 rc = LDAP_OTHER;
 474                         }
 475
 476                         if ( res != NULL ) {
 477                                 ldap_msgfree( res );
 478                         }
 479                 }
 480 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 481                 /*
 482                  * use synchronous StartTLS
 483                  */
 484                 rc = ldap_start_tls_s( ld, NULL, NULL );
 485 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 486
 487                 /* if StartTLS is requested, only attempt it if the URL
 488                  * is not "ldaps://"; this may occur not only in case
 489                  * of misconfiguration, but also when used in the chain
 490                  * overlay, where the "uri" can be parsed out of a referral */
 491                 switch ( rc ) {
 492                 case LDAP_SUCCESS:
 493                         *is_tls = 1;
 494                         break;
 495
 496                 case LDAP_SERVER_DOWN:
 497                         break;
 498
 499                 default:
 500                         if ( LDAP_BACK_TLS_CRITICAL( &dummy ) ) {
 501                                 *text = "could not start TLS";
 502                                 break;
 503                         }
 504
 505                         /* in case Start TLS is not critical */
 506                         *is_tls = 0;
 507                         rc = LDAP_SUCCESS;
 508                         break;
 509                 }
 510
 511         } else {
 512                 *is_tls = 0;
 513         }
 514
 515         return rc;
 516 }
 517 #endif /* HAVE_TLS */
 518
 519 static int
 520 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 521 {
 522         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 523         int             version;
 524         LDAP            *ld = NULL;
 525 #ifdef HAVE_TLS
 526         int             is_tls = op->o_conn->c_is_tls;
 527         time_t          lc_time = (time_t)(-1);
 528 #endif /* HAVE_TLS */
 529
 530         assert( lcp != NULL );
 531
 532         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 533         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 534         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 535         if ( rs->sr_err != LDAP_SUCCESS ) {
 536                 goto error_return;
 537         }
 538
 539         if ( li->li_urllist_f ) {
 540                 ldap_set_urllist_proc( ld, li->li_urllist_f, li->li_urllist_p );
 541         }
 542
 543         /* Set LDAP version. This will always succeed: If the client
 544          * bound with a particular version, then so can we.
 545          */
 546         if ( li->li_version != 0 ) {
 547                 version = li->li_version;
 548
 549         } else if ( op->o_protocol != 0 ) {
 550                 version = op->o_protocol;
 551
 552         } else {
 553                 /* assume it's an internal op; set to LDAPv3 */
 554                 version = LDAP_VERSION3;
 555         }
 556         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&version );
 557
 558         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 559         ldap_set_option( ld, LDAP_OPT_REFERRALS,
 560                 LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 561
 562         if ( li->li_network_timeout > 0 ) {
 563                 struct timeval          tv;
 564
 565                 tv.tv_sec = li->li_network_timeout;
 566                 tv.tv_usec = 0;
 567                 ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
 568         }
 569
 570 #ifdef HAVE_TLS
 571         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 572         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 573                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 574         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 575         if ( rs->sr_err != LDAP_SUCCESS ) {
 576                 ldap_unbind_ext( ld, NULL, NULL );
 577                 goto error_return;
 578
 579         } else if ( li->li_idle_timeout ) {
 580                 /* only touch when activity actually took place... */
 581                 lc_time = op->o_time;
 582         }
 583 #endif /* HAVE_TLS */
 584
 585         if ( *lcp == NULL ) {
 586                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 587                 (*lcp)->lc_flags = li->li_flags;
 588         }
 589         (*lcp)->lc_ld = ld;
 590         (*lcp)->lc_refcnt = 1;
 591         (*lcp)->lc_binding = 1;
 592 #ifdef HAVE_TLS
 593         if ( is_tls ) {
 594                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 595         } else {
 596                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 597         }
 598         if ( lc_time != (time_t)(-1) ) {
 599                 (*lcp)->lc_time = lc_time;
 600         }
 601 #endif /* HAVE_TLS */
 602
 603 error_return:;
 604         if ( rs->sr_err != LDAP_SUCCESS ) {
 605                 rs->sr_err = slap_map_api2result( rs );
 606                 if ( sendok & LDAP_BACK_SENDERR ) {
 607                         if ( rs->sr_text == NULL ) {
 608                                 rs->sr_text = "ldap_initialize() failed";
 609                         }
 610                         send_ldap_result( op, rs );
 611                         rs->sr_text = NULL;
 612                 }
 613
 614         } else {
 615                 if ( li->li_conn_ttl > 0 ) {
 616                         (*lcp)->lc_create_time = op->o_time;
 617                 }
 618         }
 619
 620         return rs->sr_err;
 621 }
 622
 623 static ldapconn_t *
 624 ldap_back_getconn(
 625         Operation               *op,
 626         SlapReply               *rs,
 627         ldap_back_send_t        sendok,
 628         struct berval           *binddn,
 629         struct berval           *bindcred )
 630 {
 631         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 632         ldapconn_t      *lc = NULL,
 633                         lc_curr = { 0 };
 634         int             refcnt = 1,
 635                         binding = 1;
 636
 637         /* if the server is quarantined, and
 638          * - the current interval did not expire yet, or
 639          * - no more retries should occur,
 640          * don't return the connection */
 641         if ( li->li_isquarantined ) {
 642                 slap_retry_info_t       *ri = &li->li_quarantine;
 643                 int                     dont_retry = 1;
 644
 645                 ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
 646                 if ( li->li_isquarantined == LDAP_BACK_FQ_YES ) {
 647                         dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
 648                                 || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
 649                         if ( !dont_retry ) {
 650                                 Debug( LDAP_DEBUG_ANY,
 651                                         "%s: ldap_back_getconn quarantine "
 652                                         "retry block #%d try #%d.\n",
 653                                         op->o_log_prefix, ri->ri_idx, ri->ri_count );
 654                                 li->li_isquarantined = LDAP_BACK_FQ_RETRYING;
 655                         }
 656                 }
 657                 ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
 658
 659                 if ( dont_retry ) {
 660                         rs->sr_err = LDAP_UNAVAILABLE;
 661                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 662                                 send_ldap_result( op, rs );
 663                         }
 664                         return NULL;
 665                 }
 666         }
 667
 668         /* Internal searches are privileged and shared. So is root. */
 669         if ( op->o_do_not_cache || be_isroot( op ) ) {
 670                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 671                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 672                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 673
 674         } else {
 675                 lc_curr.lc_local_ndn = op->o_ndn;
 676                 /* Explicit binds must not be shared */
 677                 if ( op->o_tag == LDAP_REQ_BIND ) {
 678                         lc_curr.lc_conn = op->o_conn;
 679
 680                 } else {
 681                         if ( !( sendok & LDAP_BACK_BINDING ) &&
 682                                 ldap_back_is_proxy_authz( op, rs, sendok, binddn, bindcred ) )
 683                         {
 684                                 lc_curr.lc_local_ndn = *binddn;
 685                                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 686                                 LDAP_BACK_CONN_ISIDASSERT_SET( &lc_curr );
 687
 688                         } else if ( SLAP_IS_AUTHZ_BACKEND( op ) ) {
 689                                 lc_curr.lc_conn = op->o_conn;
 690
 691                         } else {
 692                                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 693                         }
 694                 }
 695         }
 696
 697         /* Explicit Bind requests always get their own conn */
 698         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 699                 /* Searches for a ldapconn in the avl tree */
 700 retry_lock:
 701                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 702
 703                 lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 704                                 (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 705                 if ( lc != NULL ) {
 706                         /* Don't reuse connections while they're still binding */
 707                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 708                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 709                                 ldap_pvt_thread_yield();
 710                                 goto retry_lock;
 711                         }
 712
 713                         refcnt = ++lc->lc_refcnt;
 714                         binding = ++lc->lc_binding;
 715                 }
 716                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 717         }
 718
 719         /* Looks like we didn't get a bind. Open a new session... */
 720         if ( lc == NULL ) {
 721                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 722                         return NULL;
 723                 }
 724
 725                 if ( sendok & LDAP_BACK_BINDING ) {
 726                         LDAP_BACK_CONN_BINDING_SET( lc );
 727                 }
 728
 729                 lc->lc_conn = lc_curr.lc_conn;
 730                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 731
 732                 /*
 733                  * the rationale is: connections as the rootdn are privileged,
 734                  * so acl_authcDN is to be used; however, in some cases
 735                  * one already configured identity assertion with a highly
 736                  * privileged idassert_authcDN, so if acl_authcDN is NULL
 737                  * and idassert_authcDN is not, use the second instead.
 738                  *
 739                  * might change in the future, because it's preferable
 740                  * to make clear what identity is being used, since
 741                  * the only drawback is that one risks to configure
 742                  * the same identity twice...
 743                  */
 744                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 745                         if ( BER_BVISNULL( &li->li_acl_authcDN ) && !BER_BVISNULL( &li->li_idassert_authcDN ) ) {
 746                                 ber_dupbv( &lc->lc_bound_ndn, &li->li_idassert_authcDN );
 747                                 ber_dupbv( &lc->lc_cred, &li->li_idassert_passwd );
 748
 749                         } else {
 750                                 ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 751                                 ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 752                         }
 753                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 754
 755                 } else if ( LDAP_BACK_CONN_ISIDASSERT( &lc_curr ) ) {
 756                         ber_dupbv( &lc->lc_bound_ndn, &li->li_idassert_authcDN );
 757                         ber_dupbv( &lc->lc_cred, &li->li_idassert_passwd );
 758                         LDAP_BACK_CONN_ISIDASSERT_SET( lc );
 759
 760                 } else {
 761                         BER_BVZERO( &lc->lc_cred );
 762                         BER_BVZERO( &lc->lc_bound_ndn );
 763                         if ( !BER_BVISEMPTY( &op->o_ndn )
 764                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 765                         {
 766                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 767                         }
 768                 }
 769
 770 #ifdef HAVE_TLS
 771                 /* if start TLS failed but it was not mandatory,
 772                  * check if the non-TLS connection was already
 773                  * in cache; in case, destroy the newly created
 774                  * connection and use the existing one */
 775                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 776                                 && !ldap_tls_inplace( lc->lc_ld ) )
 777                 {
 778                         ldapconn_t *tmplc;
 779
 780                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 781                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 782                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 783                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 784                         if ( tmplc != NULL ) {
 785                                 refcnt = ++tmplc->lc_refcnt;
 786                                 binding = ++tmplc->lc_binding;
 787                                 ldap_back_conn_free( lc );
 788                                 lc = tmplc;
 789                         }
 790                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 791
 792                         if ( tmplc != NULL ) {
 793                                 goto done;
 794                         }
 795                 }
 796 #endif /* HAVE_TLS */
 797
 798                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 799
 800                 /* Inserts the newly created ldapconn in the avl tree */
 801                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 802
 803 #if LDAP_BACK_PRINT_CONNTREE > 0
 804                 ldap_back_print_conntree( li->li_conninfo.lai_tree, ">>> ldap_back_getconn(insert)" );
 805 #endif /* LDAP_BACK_PRINT_CONNTREE */
 806
 807                 assert( lc->lc_refcnt == 1 );
 808                 assert( lc->lc_binding == 1 );
 809                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 810                         ldap_back_conndn_cmp, ldap_back_conndn_dup );
 811
 812 #if LDAP_BACK_PRINT_CONNTREE > 0
 813                 ldap_back_print_conntree( li->li_conninfo.lai_tree, "<<< ldap_back_getconn(insert)" );
 814 #endif /* LDAP_BACK_PRINT_CONNTREE */
 815
 816                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 817
 818                 Debug( LDAP_DEBUG_TRACE,
 819                         "=>ldap_back_getconn: conn %p inserted refcnt=%u binding=%u\n",
 820                         (void *)lc, refcnt, binding );
 821
 822                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 823                 switch ( rs->sr_err ) {
 824                 case 0:
 825                         break;
 826
 827                 case -1:
 828                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 829                                 /* duplicate: free and try to get the newly created one */
 830                                 goto retry_lock;
 831                         }
 832                         /* taint connection, so that it'll be freed when released */
 833                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 834 #if LDAP_BACK_PRINT_CONNTREE > 0
 835                         ldap_back_print_conntree( li->li_conninfo.lai_tree, ">>> ldap_back_getconn(delete)" );
 836 #endif /* LDAP_BACK_PRINT_CONNTREE */
 837                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 838                                         ldap_back_conndnlc_cmp );
 839 #if LDAP_BACK_PRINT_CONNTREE > 0
 840                         ldap_back_print_conntree( li->li_conninfo.lai_tree, "<<< ldap_back_getconn(delete)" );
 841 #endif /* LDAP_BACK_PRINT_CONNTREE */
 842                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 843                         LDAP_BACK_CONN_TAINTED_SET( lc );
 844                         break;
 845
 846                 default:
 847                         ldap_back_conn_free( lc );
 848                         rs->sr_err = LDAP_OTHER;
 849                         rs->sr_text = "proxy bind collision";
 850                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 851                                 send_ldap_result( op, rs );
 852                                 rs->sr_text = NULL;
 853                         }
 854                         return NULL;
 855                 }
 856
 857         } else {
 858                 int     expiring = 0;
 859
 860                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
 861                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
 862                 {
 863                         expiring = 1;
 864
 865                         /* let it be used, but taint/delete it so that
 866                          * no-one else can look it up any further */
 867                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 868 #if LDAP_BACK_PRINT_CONNTREE > 0
 869                         ldap_back_print_conntree( li->li_conninfo.lai_tree, ">>> ldap_back_getconn(timeout)" );
 870 #endif /* LDAP_BACK_PRINT_CONNTREE */
 871                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 872                                         ldap_back_conndnlc_cmp );
 873 #if LDAP_BACK_PRINT_CONNTREE > 0
 874                         ldap_back_print_conntree( li->li_conninfo.lai_tree, "<<< ldap_back_getconn(timeout)" );
 875 #endif /* LDAP_BACK_PRINT_CONNTREE */
 876                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 877                         LDAP_BACK_CONN_TAINTED_SET( lc );
 878                 }
 879
 880                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 881                         char    buf[ SLAP_TEXT_BUFLEN ];
 882
 883                         snprintf( buf, sizeof( buf ),
 884                                 "conn %p fetched refcnt=%u binding=%u%s",
 885                                 (void *)lc, refcnt, binding, expiring ? " expiring" : "" );
 886                         Debug( LDAP_DEBUG_TRACE,
 887                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
 888                 }
 889         }
 890
 891 #ifdef HAVE_TLS
 892 done:;
 893 #endif /* HAVE_TLS */
 894
 895         return lc;
 896 }
 897
 898 void
 899 ldap_back_release_conn_lock(
 900         Operation               *op,
 901         SlapReply               *rs,
 902         ldapconn_t              **lcp,
 903         int                     dolock )
 904 {
 905         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 906
 907         ldapconn_t      *lc = *lcp;
 908
 909         if ( dolock ) {
 910                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 911         }
 912         assert( lc->lc_refcnt > 0 );
 913         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 914         lc->lc_refcnt--;
 915         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
 916                 ldap_back_freeconn( op, lc, 0 );
 917                 *lcp = NULL;
 918         }
 919         if ( dolock ) {
 920                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 921         }
 922 }
 923
 924 void
 925 ldap_back_quarantine(
 926         Operation       *op,
 927         SlapReply       *rs )
 928 {
 929         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 930
 931         slap_retry_info_t       *ri = &li->li_quarantine;
 932
 933         ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
 934
 935         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
 936                 time_t          new_last = slap_get_time();
 937
 938                 switch ( li->li_isquarantined ) {
 939                 case LDAP_BACK_FQ_NO:
 940                         if ( ri->ri_last == new_last ) {
 941                                 goto done;
 942                         }
 943
 944                         Debug( LDAP_DEBUG_ANY,
 945                                 "%s: ldap_back_quarantine enter.\n",
 946                                 op->o_log_prefix, 0, 0 );
 947
 948                         ri->ri_idx = 0;
 949                         ri->ri_count = 0;
 950                         break;
 951
 952                 case LDAP_BACK_FQ_RETRYING:
 953                         Debug( LDAP_DEBUG_ANY,
 954                                 "%s: ldap_back_quarantine block #%d try #%d failed.\n",
 955                                 op->o_log_prefix, ri->ri_idx, ri->ri_count );
 956
 957                         ++ri->ri_count;
 958                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
 959                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
 960                         {
 961                                 ri->ri_count = 0;
 962                                 ++ri->ri_idx;
 963                         }
 964                         break;
 965
 966                 default:
 967                         break;
 968                 }
 969
 970                 li->li_isquarantined = LDAP_BACK_FQ_YES;
 971                 ri->ri_last = new_last;
 972
 973         } else if ( li->li_isquarantined != LDAP_BACK_FQ_NO ) {
 974                 Debug( LDAP_DEBUG_ANY,
 975                         "%s: ldap_back_quarantine exit.\n",
 976                         op->o_log_prefix, ri->ri_idx, ri->ri_count );
 977
 978                 if ( li->li_quarantine_f ) {
 979                         (void)li->li_quarantine_f( li, li->li_quarantine_p );
 980                 }
 981
 982                 ri->ri_count = 0;
 983                 ri->ri_idx = 0;
 984                 li->li_isquarantined = LDAP_BACK_FQ_NO;
 985         }
 986
 987 done:;
 988         ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
 989 }
 990
 991 /*
 992  * ldap_back_dobind_int
 993  *
 994  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 995  */
 996 static int
 997 ldap_back_dobind_int(
 998         ldapconn_t              **lcp,
 999         Operation               *op,
1000         SlapReply               *rs,
1001         ldap_back_send_t        sendok,
1002         int                     retries,
1003         int                     dolock )
1004 {
1005         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1006
1007         ldapconn_t      *lc;
1008         struct berval   binddn = slap_empty_bv,
1009                         bindcred = slap_empty_bv;
1010
1011         int             rc = 0,
1012                         isbound,
1013                         binding = 0;
1014         ber_int_t       msgid;
1015
1016         assert( lcp != NULL );
1017         assert( retries >= 0 );
1018
1019         if ( sendok & LDAP_BACK_GETCONN ) {
1020                 assert( *lcp == NULL );
1021
1022                 lc = ldap_back_getconn( op, rs, sendok, &binddn, &bindcred );
1023                 if ( lc == NULL ) {
1024                         return 0;
1025                 }
1026                 *lcp = lc;
1027
1028         } else {
1029                 lc = *lcp;
1030         }
1031
1032         assert( lc != NULL );
1033
1034 retry_lock:;
1035         if ( dolock ) {
1036                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1037         }
1038
1039         if ( binding == 0 ) {
1040                 /* check if already bound */
1041                 rc = isbound = LDAP_BACK_CONN_ISBOUND( lc );
1042                 if ( isbound ) {
1043                         lc->lc_binding--;
1044                         if ( dolock ) {
1045                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1046                         }
1047                         return rc;
1048                 }
1049
1050                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
1051                         /* if someone else is about to bind it, give up and retry */
1052                         if ( dolock ) {
1053                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1054                         }
1055                         ldap_pvt_thread_yield();
1056                         goto retry_lock;
1057
1058                 } else {
1059                         /* otherwise this thread will bind it */
1060                         LDAP_BACK_CONN_BINDING_SET( lc );
1061                         binding = 1;
1062                 }
1063         }
1064
1065         /* wait for pending operations to finish */
1066         /* FIXME: may become a bottleneck! */
1067         if ( lc->lc_refcnt != lc->lc_binding ) {
1068                 if ( dolock ) {
1069                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1070                 }
1071                 ldap_pvt_thread_yield();
1072                 goto retry_lock;
1073         }
1074
1075         if ( dolock ) {
1076                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1077         }
1078
1079         /*
1080          * FIXME: we need to let clients use proxyAuthz
1081          * otherwise we cannot do symmetric pools of servers;
1082          * we have to live with the fact that a user can
1083          * authorize itself as any ID that is allowed
1084          * by the authzTo directive of the "proxyauthzdn".
1085          */
1086         /*
1087          * NOTE: current Proxy Authorization specification
1088          * and implementation do not allow proxy authorization
1089          * control to be provided with Bind requests
1090          */
1091         /*
1092          * if no bind took place yet, but the connection is bound
1093          * and the "idassert-authcDN" (or other ID) is set,
1094          * then bind as the asserting identity and explicitly
1095          * add the proxyAuthz control to every operation with the
1096          * dn bound to the connection as control value.
1097          * This is done also if this is the authrizing backend,
1098          * but the "override" flag is given to idassert.
1099          * It allows to use SASL bind and yet proxyAuthz users
1100          */
1101         if ( LDAP_BACK_CONN_ISIDASSERT( lc ) ) {
1102                 if ( BER_BVISEMPTY( &binddn ) && BER_BVISEMPTY( &bindcred ) ) {
1103                         ldap_back_is_proxy_authz( op, rs, sendok, &binddn, &bindcred );
1104                 }
1105                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok, &binddn, &bindcred );
1106                 goto done;
1107         }
1108
1109 #ifdef HAVE_CYRUS_SASL
1110         if ( LDAP_BACK_CONN_ISPRIV( lc )
1111                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
1112         {
1113                 void            *defaults = NULL;
1114
1115                 if ( li->li_acl_secprops != NULL ) {
1116                         rc = ldap_set_option( lc->lc_ld,
1117                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops );
1118
1119                         if ( rc != LDAP_OPT_SUCCESS ) {
1120                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
1121                                         "(SECPROPS,\"%s\") failed!\n",
1122                                         li->li_acl_secprops, 0, 0 );
1123                                 goto done;
1124                         }
1125                 }
1126
1127                 defaults = lutil_sasl_defaults( lc->lc_ld,
1128                                 li->li_acl_sasl_mech.bv_val,
1129                                 li->li_acl_sasl_realm.bv_val,
1130                                 li->li_acl_authcID.bv_val,
1131                                 li->li_acl_passwd.bv_val,
1132                                 NULL );
1133
1134                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
1135                                 li->li_acl_authcDN.bv_val,
1136                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
1137                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1138                                 defaults );
1139
1140                 lutil_sasl_freedefs( defaults );
1141
1142                 rs->sr_err = slap_map_api2result( rs );
1143                 if ( rs->sr_err != LDAP_SUCCESS ) {
1144                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1145                         if ( sendok & LDAP_BACK_SENDERR ) {
1146                                 send_ldap_result( op, rs );
1147                         }
1148
1149                 } else {
1150                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1151                 }
1152
1153                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1154                         ldap_back_quarantine( op, rs );
1155                 }
1156
1157                 goto done;
1158         }
1159 #endif /* HAVE_CYRUS_SASL */
1160
1161 retry:;
1162         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1163                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1164                         LDAP_SASL_SIMPLE, &lc->lc_cred,
1165                         NULL, NULL, &msgid );
1166
1167         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
1168                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
1169                         if ( dolock ) {
1170                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1171                         }
1172
1173                         assert( lc->lc_refcnt > 0 );
1174                         if ( lc->lc_refcnt == 1 ) {
1175                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
1176                                 lc->lc_ld = NULL;
1177
1178                                 /* lc here must be the regular lc, reset and ready for init */
1179                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
1180                                 if ( rs->sr_err != LDAP_SUCCESS ) {
1181                                         lc->lc_binding--;
1182                                         lc->lc_refcnt = 0;
1183                                 }
1184                         }
1185
1186                         if ( dolock ) {
1187                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1188                         }
1189
1190                         if ( rs->sr_err == LDAP_SUCCESS ) {
1191                                 if ( retries > 0 ) {
1192                                         retries--;
1193                                 }
1194                                 goto retry;
1195                         }
1196
1197                 } else {
1198                         if ( dolock ) {
1199                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1200                         }
1201                         lc->lc_binding--;
1202                         if ( dolock ) {
1203                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1204                         }
1205                 }
1206
1207                 /* FIXME: one binding-- too many? */
1208                 lc->lc_binding--;
1209                 assert( lc->lc_refcnt == 1 );
1210                 lc->lc_refcnt = 0;
1211                 ldap_back_freeconn( op, lc, dolock );
1212                 *lcp = NULL;
1213                 rs->sr_err = slap_map_api2result( rs );
1214
1215                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1216                         ldap_back_quarantine( op, rs );
1217                 }
1218
1219                 if ( rs->sr_err != LDAP_SUCCESS &&
1220                         ( sendok & LDAP_BACK_SENDERR ) )
1221                 {
1222                         send_ldap_result( op, rs );
1223                 }
1224
1225                 return 0;
1226         }
1227
1228         rc = ldap_back_op_result( lc, op, rs, msgid,
1229                 -1, (sendok|LDAP_BACK_BINDING) );
1230         if ( rc == LDAP_SUCCESS ) {
1231                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1232         }
1233
1234 done:;
1235         lc->lc_binding--;
1236         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1237         rc = LDAP_BACK_CONN_ISBOUND( lc );
1238         if ( !rc ) {
1239                 ldap_back_release_conn_lock( op, rs, lcp, dolock );
1240
1241         } else if ( LDAP_BACK_SAVECRED( li ) ) {
1242                 ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
1243         }
1244
1245         return rc;
1246 }
1247
1248 /*
1249  * ldap_back_dobind
1250  *
1251  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
1252  */
1253 int
1254 ldap_back_dobind( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1255 {
1256         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1257
1258         return ldap_back_dobind_int( lcp, op, rs,
1259                 ( sendok | LDAP_BACK_GETCONN ), li->li_nretries, 1 );
1260 }
1261
1262 /*
1263  * ldap_back_default_rebind
1264  *
1265  * This is a callback used for chasing referrals using the same
1266  * credentials as the original user on this session.
1267  */
1268 int
1269 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1270         ber_int_t msgid, void *params )
1271 {
1272         ldapconn_t      *lc = (ldapconn_t *)params;
1273
1274 #ifdef HAVE_TLS
1275         /* ... otherwise we couldn't get here */
1276         assert( lc != NULL );
1277
1278         if ( !ldap_tls_inplace( ld ) ) {
1279                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1280                                 rc;
1281                 const char      *text = NULL;
1282
1283                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1284                         LDAP_BACK_RETRY_DEFAULT, &text );
1285                 if ( rc != LDAP_SUCCESS ) {
1286                         return rc;
1287                 }
1288         }
1289 #endif /* HAVE_TLS */
1290
1291         /* FIXME: add checks on the URL/identity? */
1292
1293         return ldap_sasl_bind_s( ld,
1294                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1295                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1296 }
1297
1298 /*
1299  * ldap_back_default_urllist
1300  */
1301 int
1302 ldap_back_default_urllist(
1303         LDAP            *ld,
1304         LDAPURLDesc     **urllist,
1305         LDAPURLDesc     **url,
1306         void            *params )
1307 {
1308         ldapinfo_t      *li = (ldapinfo_t *)params;
1309         LDAPURLDesc     **urltail;
1310
1311         if ( urllist == url ) {
1312                 return LDAP_SUCCESS;
1313         }
1314
1315         for ( urltail = &(*url)->lud_next; *urltail; urltail = &(*urltail)->lud_next )
1316                 /* count */ ;
1317
1318         *urltail = *urllist;
1319         *urllist = *url;
1320         *url = NULL;
1321
1322         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1323         if ( li->li_uri ) {
1324                 ch_free( li->li_uri );
1325         }
1326
1327         ldap_get_option( ld, LDAP_OPT_URI, (void *)&li->li_uri );
1328         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1329
1330         return LDAP_SUCCESS;
1331 }
1332
1333 int
1334 ldap_back_cancel(
1335                 ldapconn_t              *lc,
1336                 Operation               *op,
1337                 SlapReply               *rs,
1338                 ber_int_t               msgid,
1339                 ldap_back_send_t        sendok )
1340 {
1341         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1342
1343         /* default behavior */
1344         if ( LDAP_BACK_ABANDON( li ) ) {
1345                 return ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1346         }
1347
1348         if ( LDAP_BACK_IGNORE( li ) ) {
1349                 return ldap_pvt_discard( lc->lc_ld, msgid );
1350         }
1351
1352         if ( LDAP_BACK_CANCEL( li ) ) {
1353                 /* FIXME: asynchronous? */
1354                 return ldap_cancel_s( lc->lc_ld, msgid, NULL, NULL );
1355         }
1356
1357         assert( 0 );
1358
1359         return LDAP_OTHER;
1360 }
1361
1362 int
1363 ldap_back_op_result(
1364                 ldapconn_t              *lc,
1365                 Operation               *op,
1366                 SlapReply               *rs,
1367                 ber_int_t               msgid,
1368                 time_t                  timeout,
1369                 ldap_back_send_t        sendok )
1370 {
1371         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1372
1373         char            *match = NULL;
1374         char            *text = NULL;
1375         char            **refs = NULL;
1376         LDAPControl     **ctrls = NULL;
1377
1378 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1379
1380         rs->sr_text = NULL;
1381         rs->sr_matched = NULL;
1382         rs->sr_ref = NULL;
1383         rs->sr_ctrls = NULL;
1384
1385         /* if the error recorded in the reply corresponds
1386          * to a successful state, get the error from the
1387          * remote server response */
1388         if ( ERR_OK( rs->sr_err ) ) {
1389                 int             rc;
1390                 struct timeval  tv;
1391                 LDAPMessage     *res = NULL;
1392                 time_t          stoptime = (time_t)(-1);
1393                 int             timeout_err = op->o_protocol >= LDAP_VERSION3 ?
1394                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OTHER;
1395                 const char      *timeout_text = "Operation timed out";
1396
1397                 /* if timeout is not specified, compute and use
1398                  * the one specific to the ongoing operation */
1399                 if ( timeout == (time_t)(-1) ) {
1400                         slap_op_t       opidx = slap_req2op( op->o_tag );
1401
1402                         if ( opidx == SLAP_OP_SEARCH ) {
1403                                 if ( op->ors_tlimit <= 0 ) {
1404                                         timeout = 0;
1405
1406                                 } else {
1407                                         timeout = op->ors_tlimit;
1408                                         timeout_err = LDAP_TIMELIMIT_EXCEEDED;
1409                                         timeout_text = NULL;
1410                                 }
1411
1412                         } else {
1413                                 timeout = li->li_timeout[ opidx ];
1414                         }
1415                 }
1416
1417                 /* better than nothing :) */
1418                 if ( timeout == 0 ) {
1419                         if ( li->li_idle_timeout ) {
1420                                 timeout = li->li_idle_timeout;
1421
1422                         } else if ( li->li_conn_ttl ) {
1423                                 timeout = li->li_conn_ttl;
1424                         }
1425                 }
1426
1427                 if ( timeout ) {
1428                         stoptime = op->o_time + timeout;
1429                 }
1430
1431                 LDAP_BACK_TV_SET( &tv );
1432
1433 retry:;
1434                 /* if result parsing fails, note the failure reason */
1435                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1436                 switch ( rc ) {
1437                 case 0:
1438                         if ( timeout && slap_get_time() > stoptime ) {
1439                                 if ( sendok & LDAP_BACK_BINDING ) {
1440                                         ldap_unbind_ext( lc->lc_ld, NULL, NULL );
1441                                         lc->lc_ld = NULL;
1442                                         LDAP_BACK_CONN_TAINTED_SET( lc );
1443
1444                                 } else {
1445                                         (void)ldap_back_cancel( lc, op, rs, msgid, sendok );
1446                                 }
1447                                 rs->sr_err = timeout_err;
1448                                 rs->sr_text = timeout_text;
1449                                 break;
1450                         }
1451
1452                         /* timeout == 0 */
1453                         LDAP_BACK_TV_SET( &tv );
1454                         ldap_pvt_thread_yield();
1455                         goto retry;
1456
1457                 case -1:
1458                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1459                                         &rs->sr_err );
1460                         break;
1461
1462
1463                 /* otherwise get the result; if it is not
1464                  * LDAP_SUCCESS, record it in the reply
1465                  * structure (this includes
1466                  * LDAP_COMPARE_{TRUE|FALSE}) */
1467                 default:
1468                         /* only touch when activity actually took place... */
1469                         if ( li->li_idle_timeout ) {
1470                                 lc->lc_time = op->o_time;
1471                         }
1472
1473                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1474                                         &match, &text, &refs, &ctrls, 1 );
1475                         rs->sr_text = text;
1476                         if ( rc != LDAP_SUCCESS ) {
1477                                 rs->sr_err = rc;
1478                         }
1479                         if ( refs != NULL ) {
1480                                 int     i;
1481
1482                                 for ( i = 0; refs[ i ] != NULL; i++ )
1483                                         /* count */ ;
1484                                 rs->sr_ref = op->o_tmpalloc( sizeof( struct berval ) * ( i + 1 ),
1485                                         op->o_tmpmemctx );
1486                                 for ( i = 0; refs[ i ] != NULL; i++ ) {
1487                                         ber_str2bv( refs[ i ], 0, 0, &rs->sr_ref[ i ] );
1488                                 }
1489                                 BER_BVZERO( &rs->sr_ref[ i ] );
1490                         }
1491                         if ( ctrls != NULL ) {
1492                                 rs->sr_ctrls = ctrls;
1493                         }
1494                 }
1495         }
1496
1497         /* if the error in the reply structure is not
1498          * LDAP_SUCCESS, try to map it from client
1499          * to server error */
1500         if ( !ERR_OK( rs->sr_err ) ) {
1501                 rs->sr_err = slap_map_api2result( rs );
1502
1503                 /* internal ops ( op->o_conn == NULL )
1504                  * must not reply to client */
1505                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1506
1507                         /* record the (massaged) matched
1508                          * DN into the reply structure */
1509                         rs->sr_matched = match;
1510                 }
1511         }
1512
1513         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1514                 if ( !( sendok & LDAP_BACK_RETRYING ) ) {
1515                         if ( LDAP_BACK_QUARANTINE( li ) ) {
1516                                 ldap_back_quarantine( op, rs );
1517                         }
1518                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
1519                                 send_ldap_result( op, rs );
1520                         }
1521                 }
1522
1523         } else if ( op->o_conn &&
1524                 ( ( ( sendok & LDAP_BACK_SENDOK ) && ERR_OK( rs->sr_err ) )
1525                         || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1526         {
1527                 send_ldap_result( op, rs );
1528         }
1529
1530         if ( match ) {
1531                 if ( rs->sr_matched != match ) {
1532                         free( (char *)rs->sr_matched );
1533                 }
1534                 rs->sr_matched = NULL;
1535                 ldap_memfree( match );
1536         }
1537
1538         if ( text ) {
1539                 ldap_memfree( text );
1540         }
1541         rs->sr_text = NULL;
1542
1543         if ( rs->sr_ref ) {
1544                 assert( refs != NULL );
1545                 ber_memvfree( (void **)refs );
1546                 op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
1547                 rs->sr_ref = NULL;
1548         }
1549
1550         if ( ctrls ) {
1551                 assert( rs->sr_ctrls != NULL );
1552                 ldap_controls_free( ctrls );
1553                 rs->sr_ctrls = NULL;
1554         }
1555
1556         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1557 }
1558
1559 /* return true if bound, false if failed */
1560 int
1561 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1562 {
1563         int             rc = 0;
1564         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1565
1566         assert( lcp != NULL );
1567         assert( *lcp != NULL );
1568
1569         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1570
1571         if ( (*lcp)->lc_refcnt == 1 ) {
1572                 ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1573                 Debug( LDAP_DEBUG_ANY,
1574                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1575                         op->o_log_prefix, li->li_uri,
1576                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1577                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1578                 ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1579
1580                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1581                 (*lcp)->lc_ld = NULL;
1582                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1583
1584                 /* lc here must be the regular lc, reset and ready for init */
1585                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1586                 if ( rc != LDAP_SUCCESS ) {
1587                         /* freeit, because lc_refcnt == 1 */
1588                         (*lcp)->lc_refcnt = 0;
1589                         (void)ldap_back_freeconn( op, *lcp, 0 );
1590                         *lcp = NULL;
1591                         rc = 0;
1592
1593                 } else {
1594                         rc = ldap_back_dobind_int( lcp, op, rs, sendok, 0, 0 );
1595                         if ( rc == 0 && *lcp != NULL ) {
1596                                 /* freeit, because lc_refcnt == 1 */
1597                                 (*lcp)->lc_refcnt = 0;
1598                                 LDAP_BACK_CONN_TAINTED_SET( *lcp );
1599                                 (void)ldap_back_freeconn( op, *lcp, 0 );
1600                                 *lcp = NULL;
1601                         }
1602                 }
1603
1604         } else {
1605                 Debug( LDAP_DEBUG_TRACE,
1606                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1607                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1608
1609                 LDAP_BACK_CONN_TAINTED_SET( *lcp );
1610                 ldap_back_release_conn_lock( op, rs, lcp, 0 );
1611                 assert( *lcp == NULL );
1612
1613                 if ( sendok ) {
1614                         rs->sr_err = LDAP_UNAVAILABLE;
1615                         rs->sr_text = "unable to retry";
1616                         send_ldap_result( op, rs );
1617                 }
1618         }
1619
1620         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1621
1622         return rc;
1623 }
1624
1625 static int
1626 ldap_back_is_proxy_authz( Operation *op, SlapReply *rs, ldap_back_send_t sendok,
1627         struct berval *binddn, struct berval *bindcred )
1628 {
1629         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1630         struct berval   ndn;
1631         int             dobind = 0;
1632
1633         if ( op->o_conn == NULL || op->o_do_not_cache ) {
1634                 goto done;
1635         }
1636
1637         /* don't proxyAuthz if protocol is not LDAPv3 */
1638         switch ( li->li_version ) {
1639         case LDAP_VERSION3:
1640                 break;
1641
1642         case 0:
1643                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1644                         break;
1645                 }
1646                 /* fall thru */
1647
1648         default:
1649                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1650                 if ( sendok & LDAP_BACK_SENDERR ) {
1651                         send_ldap_result( op, rs );
1652                 }
1653                 goto done;
1654         }
1655
1656         /* safe default */
1657         *binddn = slap_empty_bv;
1658         *bindcred = slap_empty_bv;
1659
1660         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1661                 ndn = op->o_conn->c_ndn;
1662
1663         } else {
1664                 ndn = op->o_ndn;
1665         }
1666
1667         switch ( li->li_idassert_mode ) {
1668         case LDAP_BACK_IDASSERT_LEGACY:
1669                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1670                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1671                         {
1672                                 *binddn = li->li_idassert_authcDN;
1673                                 *bindcred = li->li_idassert_passwd;
1674                                 dobind = 1;
1675                         }
1676                 }
1677                 break;
1678
1679         default:
1680                 /* NOTE: rootdn can always idassert */
1681                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1682                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1683                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1684                                 if ( sendok & LDAP_BACK_SENDERR ) {
1685                                         send_ldap_result( op, rs );
1686                                 }
1687
1688                         } else {
1689                                 rs->sr_err = LDAP_SUCCESS;
1690                                 *binddn = slap_empty_bv;
1691                                 *bindcred = slap_empty_bv;
1692                                 break;
1693                         }
1694
1695                         goto done;
1696
1697                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1698                         struct berval authcDN;
1699
1700                         if ( BER_BVISNULL( &ndn ) ) {
1701                                 authcDN = slap_empty_bv;
1702
1703                         } else {
1704                                 authcDN = ndn;
1705                         }
1706                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1707                                         &authcDN, &authcDN );
1708                         if ( rs->sr_err != LDAP_SUCCESS ) {
1709                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1710                                         if ( sendok & LDAP_BACK_SENDERR ) {
1711                                                 send_ldap_result( op, rs );
1712                                         }
1713
1714                                 } else {
1715                                         rs->sr_err = LDAP_SUCCESS;
1716                                         *binddn = slap_empty_bv;
1717                                         *bindcred = slap_empty_bv;
1718                                         break;
1719                                 }
1720
1721                                 goto done;
1722                         }
1723                 }
1724
1725                 *binddn = li->li_idassert_authcDN;
1726                 *bindcred = li->li_idassert_passwd;
1727                 dobind = 1;
1728                 break;
1729         }
1730
1731 done:;
1732         return dobind;
1733 }
1734
1735 static int
1736 ldap_back_proxy_authz_bind(
1737         ldapconn_t              *lc,
1738         Operation               *op,
1739         SlapReply               *rs,
1740         ldap_back_send_t        sendok,
1741         struct berval           *binddn,
1742         struct berval           *bindcred )
1743 {
1744         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1745         struct berval   ndn;
1746         int             msgid;
1747         int             rc;
1748
1749         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1750                 ndn = op->o_conn->c_ndn;
1751
1752         } else {
1753                 ndn = op->o_ndn;
1754         }
1755
1756         if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1757 #ifdef HAVE_CYRUS_SASL
1758                 void            *defaults = NULL;
1759                 struct berval   authzID = BER_BVNULL;
1760                 int             freeauthz = 0;
1761
1762                 /* if SASL supports native authz, prepare for it */
1763                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1764                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1765                 {
1766                         switch ( li->li_idassert_mode ) {
1767                         case LDAP_BACK_IDASSERT_OTHERID:
1768                         case LDAP_BACK_IDASSERT_OTHERDN:
1769                                 authzID = li->li_idassert_authzID;
1770                                 break;
1771
1772                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1773                                 BER_BVSTR( &authzID, "dn:" );
1774                                 break;
1775
1776                         case LDAP_BACK_IDASSERT_SELF:
1777                                 if ( BER_BVISNULL( &ndn ) ) {
1778                                         /* connection is not authc'd, so don't idassert */
1779                                         BER_BVSTR( &authzID, "dn:" );
1780                                         break;
1781                                 }
1782                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1783                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1784                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1785                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1786                                                 ndn.bv_val, ndn.bv_len + 1 );
1787                                 freeauthz = 1;
1788                                 break;
1789
1790                         default:
1791                                 break;
1792                         }
1793                 }
1794
1795                 if ( li->li_idassert_secprops != NULL ) {
1796                         rs->sr_err = ldap_set_option( lc->lc_ld,
1797                                 LDAP_OPT_X_SASL_SECPROPS,
1798                                 (void *)li->li_idassert_secprops );
1799
1800                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1801                                 rs->sr_err = LDAP_OTHER;
1802                                 if ( sendok & LDAP_BACK_SENDERR ) {
1803                                         send_ldap_result( op, rs );
1804                                 }
1805                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1806                                 goto done;
1807                         }
1808                 }
1809
1810                 defaults = lutil_sasl_defaults( lc->lc_ld,
1811                                 li->li_idassert_sasl_mech.bv_val,
1812                                 li->li_idassert_sasl_realm.bv_val,
1813                                 li->li_idassert_authcID.bv_val,
1814                                 li->li_idassert_passwd.bv_val,
1815                                 authzID.bv_val );
1816
1817                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn->bv_val,
1818                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1819                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1820                                 defaults );
1821
1822                 rs->sr_err = slap_map_api2result( rs );
1823                 if ( rs->sr_err != LDAP_SUCCESS ) {
1824                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1825                         if ( sendok & LDAP_BACK_SENDERR ) {
1826                                 send_ldap_result( op, rs );
1827                         }
1828
1829                 } else {
1830                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1831                 }
1832
1833                 lutil_sasl_freedefs( defaults );
1834                 if ( freeauthz ) {
1835                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1836                 }
1837
1838                 goto done;
1839 #endif /* HAVE_CYRUS_SASL */
1840         }
1841
1842         switch ( li->li_idassert_authmethod ) {
1843         case LDAP_AUTH_NONE:
1844                 /* FIXME: do we really need this? */
1845                 BER_BVSTR( binddn, "" );
1846                 BER_BVSTR( bindcred, "" );
1847                 /* fallthru */
1848
1849         case LDAP_AUTH_SIMPLE:
1850                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1851                                 binddn->bv_val, LDAP_SASL_SIMPLE,
1852                                 bindcred, NULL, NULL, &msgid );
1853                 rc = ldap_back_op_result( lc, op, rs, msgid,
1854                         -1, (sendok|LDAP_BACK_BINDING) );
1855                 break;
1856
1857         default:
1858                 /* unsupported! */
1859                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1860                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1861                 if ( sendok & LDAP_BACK_SENDERR ) {
1862                         send_ldap_result( op, rs );
1863                 }
1864                 goto done;
1865         }
1866
1867         if ( rc == LDAP_SUCCESS ) {
1868                 /* set rebind stuff in case of successful proxyAuthz bind,
1869                  * so that referral chasing is attempted using the right
1870                  * identity */
1871                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1872                 ber_bvreplace( &lc->lc_bound_ndn, binddn );
1873
1874                 if ( LDAP_BACK_SAVECRED( li ) ) {
1875                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
1876                                 memset( lc->lc_cred.bv_val, 0,
1877                                                 lc->lc_cred.bv_len );
1878                         }
1879                         ber_bvreplace( &lc->lc_cred, bindcred );
1880                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
1881                 }
1882         }
1883 done:;
1884         return LDAP_BACK_CONN_ISBOUND( lc );
1885 }
1886
1887 /*
1888  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1889  * to existing server-side controls if required; if not,
1890  * the existing server-side controls are placed in *pctrls.
1891  * The caller, after using the controls in client API
1892  * operations, if ( *pctrls != op->o_ctrls ), should
1893  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1894  * The function returns success if the control could
1895  * be added if required, or if it did nothing; in the future,
1896  * it might return some error if it failed.
1897  *
1898  * if no bind took place yet, but the connection is bound
1899  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1900  * and explicitly add proxyAuthz the control to every operation
1901  * with the dn bound to the connection as control value.
1902  *
1903  * If no server-side controls are defined for the operation,
1904  * simply add the proxyAuthz control; otherwise, if the
1905  * proxyAuthz control is not already set, add it as
1906  * the first one
1907  *
1908  * FIXME: is controls order significant for security?
1909  * ANSWER: controls ordering and interoperability
1910  * must be indicated by the specs of each control; if none
1911  * is specified, the order is irrelevant.
1912  */
1913 int
1914 ldap_back_proxy_authz_ctrl(
1915                 struct berval   *bound_ndn,
1916                 int             version,
1917                 slap_idassert_t *si,
1918                 Operation       *op,
1919                 SlapReply       *rs,
1920                 LDAPControl     ***pctrls )
1921 {
1922         LDAPControl             **ctrls = NULL;
1923         int                     i = 0;
1924         slap_idassert_mode_t    mode;
1925         struct berval           assertedID,
1926                                 ndn;
1927
1928         *pctrls = NULL;
1929
1930         rs->sr_err = LDAP_SUCCESS;
1931
1932         /* don't proxyAuthz if protocol is not LDAPv3 */
1933         switch ( version ) {
1934         case LDAP_VERSION3:
1935                 break;
1936
1937         case 0:
1938                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1939                         break;
1940                 }
1941                 /* fall thru */
1942
1943         default:
1944                 goto done;
1945         }
1946
1947         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1948          * but if it is not set this test fails.  We need a different
1949          * means to detect if idassert is enabled */
1950         if ( ( BER_BVISNULL( &si->si_bc.sb_authcId ) || BER_BVISEMPTY( &si->si_bc.sb_authcId ) )
1951                         && ( BER_BVISNULL( &si->si_bc.sb_binddn ) || BER_BVISEMPTY( &si->si_bc.sb_binddn ) ) )
1952         {
1953                 goto done;
1954         }
1955
1956         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1957                 goto done;
1958         }
1959
1960         if ( op->o_tag == LDAP_REQ_BIND ) {
1961                 ndn = op->o_req_ndn;
1962
1963         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1964                 ndn = op->o_conn->c_ndn;
1965
1966         } else {
1967                 ndn = op->o_ndn;
1968         }
1969
1970         if ( si->si_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1971                 if ( op->o_proxy_authz ) {
1972                         /*
1973                          * FIXME: we do not want to perform proxyAuthz
1974                          * on behalf of the client, because this would
1975                          * be performed with "proxyauthzdn" privileges.
1976                          *
1977                          * This might actually be too strict, since
1978                          * the "proxyauthzdn" authzTo, and each entry's
1979                          * authzFrom attributes may be crafted
1980                          * to avoid unwanted proxyAuthz to take place.
1981                          */
1982 #if 0
1983                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1984                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1985 #endif
1986                         goto done;
1987                 }
1988
1989                 if ( !BER_BVISNULL( bound_ndn ) ) {
1990                         goto done;
1991                 }
1992
1993                 if ( BER_BVISNULL( &ndn ) ) {
1994                         goto done;
1995                 }
1996
1997                 if ( BER_BVISNULL( &si->si_bc.sb_binddn ) ) {
1998                         goto done;
1999                 }
2000
2001         } else if ( si->si_bc.sb_method == LDAP_AUTH_SASL ) {
2002                 if ( ( si->si_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
2003                 {
2004                         /* already asserted in SASL via native authz */
2005                         goto done;
2006                 }
2007
2008         } else if ( si->si_authz && !be_isroot( op ) ) {
2009                 int             rc;
2010                 struct berval authcDN;
2011
2012                 if ( BER_BVISNULL( &ndn ) ) {
2013                         authcDN = slap_empty_bv;
2014                 } else {
2015                         authcDN = ndn;
2016                 }
2017                 rc = slap_sasl_matches( op, si->si_authz,
2018                                 &authcDN, & authcDN );
2019                 if ( rc != LDAP_SUCCESS ) {
2020                         if ( si->si_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
2021                                 /* ndn is not authorized
2022                                  * to use idassert */
2023                                 rs->sr_err = rc;
2024                         }
2025                         goto done;
2026                 }
2027         }
2028
2029         if ( op->o_proxy_authz ) {
2030                 /*
2031                  * FIXME: we can:
2032                  * 1) ignore the already set proxyAuthz control
2033                  * 2) leave it in place, and don't set ours
2034                  * 3) add both
2035                  * 4) reject the operation
2036                  *
2037                  * option (4) is very drastic
2038                  * option (3) will make the remote server reject
2039                  * the operation, thus being equivalent to (4)
2040                  * option (2) will likely break the idassert
2041                  * assumptions, so we cannot accept it;
2042                  * option (1) means that we are contradicting
2043                  * the client's reques.
2044                  *
2045                  * I think (4) is the only correct choice.
2046                  */
2047                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2048                 rs->sr_text = "proxyAuthz not allowed within namingContext";
2049         }
2050
2051         if ( op->o_is_auth_check ) {
2052                 mode = LDAP_BACK_IDASSERT_NOASSERT;
2053
2054         } else {
2055                 mode = si->si_mode;
2056         }
2057
2058         switch ( mode ) {
2059         case LDAP_BACK_IDASSERT_SELF:
2060                 if ( BER_BVISNULL( &ndn ) ) {
2061                         goto done;
2062                 }
2063                 assertedID = ndn;
2064                 break;
2065
2066         case LDAP_BACK_IDASSERT_LEGACY:
2067                 /* original behavior:
2068                  * assert the client's identity */
2069                 if ( BER_BVISNULL( &ndn ) ) {
2070                         assertedID = slap_empty_bv;
2071                 } else {
2072                         assertedID = ndn;
2073                 }
2074                 break;
2075
2076         case LDAP_BACK_IDASSERT_ANONYMOUS:
2077                 /* assert "anonymous" */
2078                 assertedID = slap_empty_bv;
2079                 break;
2080
2081         case LDAP_BACK_IDASSERT_NOASSERT:
2082                 /* don't assert; bind as proxyauthzdn */
2083                 goto done;
2084
2085         case LDAP_BACK_IDASSERT_OTHERID:
2086         case LDAP_BACK_IDASSERT_OTHERDN:
2087                 /* assert idassert DN */
2088                 assertedID = si->si_bc.sb_authzId;
2089                 break;
2090
2091         default:
2092                 assert( 0 );
2093         }
2094
2095         if ( BER_BVISNULL( &assertedID ) ) {
2096                 assertedID = slap_empty_bv;
2097         }
2098
2099         /* don't idassert the bound DN (ITS#4497) */
2100         if ( dn_match( &assertedID, bound_ndn ) ) {
2101                 goto done;
2102         }
2103
2104         if ( op->o_ctrls ) {
2105                 for ( i = 0; op->o_ctrls[ i ]; i++ )
2106                         /* just count ctrls */ ;
2107         }
2108
2109         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
2110                         op->o_tmpmemctx );
2111         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
2112
2113         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
2114         ctrls[ 0 ]->ldctl_iscritical = 1;
2115
2116         switch ( si->si_mode ) {
2117         /* already in u:ID or dn:DN form */
2118         case LDAP_BACK_IDASSERT_OTHERID:
2119         case LDAP_BACK_IDASSERT_OTHERDN:
2120                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
2121                 break;
2122
2123         /* needs the dn: prefix */
2124         default:
2125                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
2126                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
2127                                 op->o_tmpmemctx );
2128                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
2129                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
2130                                 assertedID.bv_val, assertedID.bv_len + 1 );
2131                 break;
2132         }
2133
2134         /* Older versions of <draft-weltman-ldapv3-proxy> required
2135          * to encode the value of the authzID (and called it proxyDN);
2136          * this hack provides compatibility with those DSAs that
2137          * implement it this way */
2138         if ( si->si_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
2139                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
2140                 BerElementBuffer        berbuf;
2141                 BerElement              *ber = (BerElement *)&berbuf;
2142                 ber_tag_t               tag;
2143
2144                 ber_init2( ber, 0, LBER_USE_DER );
2145                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
2146
2147                 tag = ber_printf( ber, "O", &authzID );
2148                 if ( tag == LBER_ERROR ) {
2149                         rs->sr_err = LDAP_OTHER;
2150                         goto free_ber;
2151                 }
2152
2153                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
2154                         rs->sr_err = LDAP_OTHER;
2155                         goto free_ber;
2156                 }
2157
2158 free_ber:;
2159                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
2160                 ber_free_buf( ber );
2161
2162                 if ( rs->sr_err != LDAP_SUCCESS ) {
2163                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2164                         ctrls = NULL;
2165                         goto done;
2166                 }
2167
2168         } else if ( si->si_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
2169                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
2170                                         tmp;
2171                 BerElementBuffer        berbuf;
2172                 BerElement              *ber = (BerElement *)&berbuf;
2173                 ber_tag_t               tag;
2174
2175                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
2176                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2177                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2178                         ctrls = NULL;
2179                         rs->sr_err = LDAP_PROTOCOL_ERROR;
2180                         goto done;
2181                 }
2182
2183                 tmp = authzID;
2184                 tmp.bv_val += STRLENOF( "dn:" );
2185                 tmp.bv_len -= STRLENOF( "dn:" );
2186
2187                 ber_init2( ber, 0, LBER_USE_DER );
2188                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
2189
2190                 /* apparently, Mozilla API encodes this
2191                  * as "SEQUENCE { LDAPDN }" */
2192                 tag = ber_printf( ber, "{O}", &tmp );
2193                 if ( tag == LBER_ERROR ) {
2194                         rs->sr_err = LDAP_OTHER;
2195                         goto free_ber2;
2196                 }
2197
2198                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
2199                         rs->sr_err = LDAP_OTHER;
2200                         goto free_ber2;
2201                 }
2202
2203 free_ber2:;
2204                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
2205                 ber_free_buf( ber );
2206
2207                 if ( rs->sr_err != LDAP_SUCCESS ) {
2208                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2209                         ctrls = NULL;
2210                         goto done;
2211                 }
2212
2213                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
2214         }
2215
2216         if ( op->o_ctrls ) {
2217                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
2218                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
2219                 }
2220         }
2221         ctrls[ i + 1 ] = NULL;
2222
2223 done:;
2224         if ( ctrls == NULL ) {
2225                 ctrls = op->o_ctrls;
2226         }
2227
2228         *pctrls = ctrls;
2229
2230         return rs->sr_err;
2231 }
2232
2233 int
2234 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
2235 {
2236         LDAPControl     **ctrls = *pctrls;
2237
2238         /* we assume that the first control is the proxyAuthz
2239          * added by back-ldap, so it's the only one we explicitly
2240          * free */
2241         if ( ctrls && ctrls != op->o_ctrls ) {
2242                 assert( ctrls[ 0 ] != NULL );
2243
2244                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
2245                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2246                 }
2247
2248                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
2249         }
2250
2251         *pctrls = NULL;
2252
2253         return 0;
2254 }