git.sur5r.net Git - openldap/blob - servers/slapd/back-ldap/bind.c

   1 /* bind.c - ldap backend bind function */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 1999-2006 The OpenLDAP Foundation.
   6  * Portions Copyright 2000-2003 Pierangelo Masarati.
   7  * Portions Copyright 1999-2003 Howard Chu.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted only as authorized by the OpenLDAP
  12  * Public License.
  13  *
  14  * A copy of this license is available in the file LICENSE in the
  15  * top-level directory of the distribution or, alternatively, at
  16  * <http://www.OpenLDAP.org/license.html>.
  17  */
  18 /* ACKNOWLEDGEMENTS:
  19  * This work was initially developed by Howard Chu for inclusion
  20  * in OpenLDAP Software and subsequently enhanced by Pierangelo
  21  * Masarati.
  22  */
  23
  24 #include "portable.h"
  25
  26 #include <stdio.h>
  27
  28 #include <ac/errno.h>
  29 #include <ac/socket.h>
  30 #include <ac/string.h>
  31
  32 #define AVL_INTERNAL
  33 #include "slap.h"
  34 #include "back-ldap.h"
  35
  36 #include <lutil_ldap.h>
  37
  38 #ifndef PRINT_CONNTREE
  39 #define PRINT_CONNTREE 0
  40 #endif /* !PRINT_CONNTREE */
  41
  42 #define LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ       "2.16.840.1.113730.3.4.12"
  43
  44 #if PRINT_CONNTREE > 0
  45 static void
  46 ravl_print( Avlnode *root, int depth )
  47 {
  48         int             i;
  49         ldapconn_t      *lc;
  50
  51         if ( root == 0 ) {
  52                 return;
  53         }
  54
  55         ravl_print( root->avl_right, depth+1 );
  56
  57         for ( i = 0; i < depth; i++ ) {
  58                 fprintf( stderr, "-" );
  59         }
  60
  61         lc = root->avl_data;
  62         fprintf( stderr, "lc=%p local=\"%s\" conn=%p %s refcnt=%d\n",
  63                 (void *)lc,
  64                 lc->lc_local_ndn.bv_val ? lc->lc_local_ndn.bv_val : "",
  65                 (void *)lc->lc_conn,
  66                 avl_bf2str( root->avl_bf ), lc->lc_refcnt );
  67
  68         ravl_print( root->avl_left, depth+1 );
  69 }
  70
  71 static void
  72 myprint( Avlnode *root, char *msg )
  73 {
  74         fprintf( stderr, "========> %s\n", msg );
  75
  76         if ( root == 0 ) {
  77                 fprintf( stderr, "\tNULL\n" );
  78
  79         } else {
  80                 ravl_print( root, 0 );
  81         }
  82
  83         fprintf( stderr, "<======== %s\n", msg );
  84 }
  85 #endif /* PRINT_CONNTREE */
  86
  87 static int
  88 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  89
  90 static int
  91 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  92
  93 static int
  94 ldap_back_conndnlc_cmp( const void *c1, const void *c2 );
  95
  96 int
  97 ldap_back_bind( Operation *op, SlapReply *rs )
  98 {
  99         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 100         ldapconn_t      *lc;
 101
 102         int rc = 0;
 103         ber_int_t msgid;
 104
 105         lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR );
 106         if ( !lc ) {
 107                 return rs->sr_err;
 108         }
 109
 110         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
 111                 ch_free( lc->lc_bound_ndn.bv_val );
 112                 BER_BVZERO( &lc->lc_bound_ndn );
 113         }
 114         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 115
 116         /* method is always LDAP_AUTH_SIMPLE if we got here */
 117         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
 118                         LDAP_SASL_SIMPLE,
 119                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
 120         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
 121
 122         if ( rc == LDAP_SUCCESS ) {
 123                 /* If defined, proxyAuthz will be used also when
 124                  * back-ldap is the authorizing backend; for this
 125                  * purpose, a successful bind is followed by a
 126                  * bind with the configured identity assertion */
 127                 /* NOTE: use with care */
 128                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
 129                         ldap_back_proxy_authz_bind( lc, op, rs, LDAP_BACK_SENDERR );
 130                         if ( !LDAP_BACK_CONN_ISBOUND( lc ) ) {
 131                                 rc = 1;
 132                         }
 133                         goto done;
 134                 }
 135
 136                 /* rebind is now done inside ldap_back_proxy_authz_bind()
 137                  * in case of success */
 138                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 139                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
 140
 141                 if ( LDAP_BACK_SAVECRED( li ) ) {
 142                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
 143                                 memset( lc->lc_cred.bv_val, 0,
 144                                                 lc->lc_cred.bv_len );
 145                         }
 146                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
 147                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
 148                 }
 149         }
 150 done:;
 151
 152         assert( lc->lc_binding == 1 );
 153         lc->lc_binding = 0;
 154
 155         /* must re-insert if local DN changed as result of bind */
 156         if ( !LDAP_BACK_CONN_ISBOUND( lc )
 157                 || ( LDAP_BACK_CONN_ISBOUND( lc )
 158                         && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) )
 159         {
 160                 int             lerr = -1;
 161                 ldapconn_t      *tmplc;
 162
 163                 /* wait for all other ops to release the connection */
 164 retry_lock:;
 165                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 166                 if ( lc->lc_refcnt > 1 ) {
 167                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 168                         ldap_pvt_thread_yield();
 169                         goto retry_lock;
 170                 }
 171
 172                 assert( lc->lc_refcnt == 1 );
 173                 tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 174                                 ldap_back_conndnlc_cmp );
 175                 assert( tmplc == NULL || lc == tmplc );
 176
 177                 /* delete all cached connections with the current connection */
 178                 if ( LDAP_BACK_SINGLECONN( li ) ) {
 179                         while ( ( tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc, ldap_back_conn_cmp ) ) != NULL )
 180                         {
 181                                 Debug( LDAP_DEBUG_TRACE,
 182                                         "=>ldap_back_bind: destroying conn %ld (refcnt=%u)\n",
 183                                         LDAP_BACK_PCONN_ID( lc->lc_conn ), lc->lc_refcnt, 0 );
 184
 185                                 if ( lc->lc_refcnt != 0 ) {
 186                                         /* taint it */
 187                                         LDAP_BACK_CONN_TAINTED_SET( tmplc );
 188
 189                                 } else {
 190                                         /*
 191                                          * Needs a test because the handler may be corrupted,
 192                                          * and calling ldap_unbind on a corrupted header results
 193                                          * in a segmentation fault
 194                                          */
 195                                         ldap_back_conn_free( tmplc );
 196                                 }
 197                         }
 198                 }
 199
 200                 if ( LDAP_BACK_CONN_ISBOUND( lc ) ) {
 201                         ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 202                         if ( be_isroot_dn( op->o_bd, &op->o_req_ndn ) ) {
 203                                 lc->lc_conn = LDAP_BACK_PCONN_SET( op );
 204                         }
 205                         lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 206                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
 207                 }
 208
 209 #if PRINT_CONNTREE > 0
 210                 myprint( li->li_conninfo.lai_tree, "ldap_back_bind" );
 211 #endif /* PRINT_CONNTREE */
 212
 213                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 214                 switch ( lerr ) {
 215                 case 0:
 216                         break;
 217
 218                 case -1:
 219                         /* duplicate; someone else successfully bound
 220                          * on the same connection with the same identity;
 221                          * we can do this because lc_refcnt == 1 */
 222                         ldap_back_conn_free( lc );
 223                         lc = NULL;
 224                 }
 225         }
 226
 227         if ( lc != NULL ) {
 228                 ldap_back_release_conn( op, rs, lc );
 229         }
 230
 231         return( rc );
 232 }
 233
 234 /*
 235  * ldap_back_conndn_cmp
 236  *
 237  * compares two ldapconn_t based on the value of the conn pointer
 238  * and of the local DN; used by avl stuff for insert, lookup
 239  * and direct delete
 240  */
 241 int
 242 ldap_back_conndn_cmp( const void *c1, const void *c2 )
 243 {
 244         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 245         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 246         int rc;
 247
 248         /* If local DNs don't match, it is definitely not a match */
 249         /* For shared sessions, conn is NULL. Only explicitly
 250          * bound sessions will have non-NULL conn.
 251          */
 252         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 253         if ( rc == 0 ) {
 254                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 255         }
 256
 257         return rc;
 258 }
 259
 260 /*
 261  * ldap_back_conndnlc_cmp
 262  *
 263  * compares two ldapconn_t based on the value of the conn pointer,
 264  * the local DN and the lc pointer; used by avl stuff for insert, lookup
 265  * and direct delete
 266  */
 267 static int
 268 ldap_back_conndnlc_cmp( const void *c1, const void *c2 )
 269 {
 270         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 271         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 272         int rc;
 273
 274         /* If local DNs don't match, it is definitely not a match */
 275         /* For shared sessions, conn is NULL. Only explicitly
 276          * bound sessions will have non-NULL conn.
 277          */
 278         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 279         if ( rc == 0 ) {
 280                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 281                 if ( rc == 0 ) {
 282                         rc = SLAP_PTRCMP( lc1, lc2 );
 283                 }
 284         }
 285
 286         return rc;
 287 }
 288
 289 /*
 290  * ldap_back_conn_cmp
 291  *
 292  * compares two ldapconn_t based on the value of the conn pointer;
 293  * used by avl stuff for delete of all conns with the same connid
 294  */
 295 int
 296 ldap_back_conn_cmp( const void *c1, const void *c2 )
 297 {
 298         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 299         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 300
 301         /* For shared sessions, conn is NULL. Only explicitly
 302          * bound sessions will have non-NULL conn.
 303          */
 304         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 305 }
 306
 307 /*
 308  * ldap_back_conndn_dup
 309  *
 310  * returns -1 in case a duplicate ldapconn_t has been inserted;
 311  * used by avl stuff
 312  */
 313 int
 314 ldap_back_conndn_dup( void *c1, void *c2 )
 315 {
 316         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 317         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 318
 319         /* Cannot have more than one shared session with same DN */
 320         if ( lc1->lc_conn == lc2->lc_conn &&
 321                 dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) )
 322         {
 323                 return -1;
 324         }
 325
 326         return 0;
 327 }
 328
 329 int
 330 ldap_back_freeconn( Operation *op, ldapconn_t *lc, int dolock )
 331 {
 332         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 333         ldapconn_t      *tmplc;
 334
 335         if ( dolock ) {
 336                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 337         }
 338
 339         tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 340                         ldap_back_conndnlc_cmp );
 341         assert( LDAP_BACK_CONN_TAINTED( lc ) || tmplc == lc );
 342         if ( lc->lc_refcnt == 0 ) {
 343                 ldap_back_conn_free( (void *)lc );
 344         }
 345
 346         if ( dolock ) {
 347                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 348         }
 349
 350         return 0;
 351 }
 352
 353 #ifdef HAVE_TLS
 354 static int
 355 ldap_back_start_tls(
 356         LDAP            *ld,
 357         int             protocol,
 358         int             *is_tls,
 359         const char      *url,
 360         unsigned        flags,
 361         int             retries,
 362         const char      **text )
 363 {
 364         int             rc = LDAP_SUCCESS;
 365         ldapinfo_t      dummy;
 366
 367         /* this is ridiculous... */
 368         dummy.li_flags = flags;
 369
 370         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 371         if ( ( LDAP_BACK_USE_TLS( &dummy ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &dummy ) ) )
 372                                 && !ldap_is_ldaps_url( url ) )
 373         {
 374 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 375                 /*
 376                  * use asynchronous StartTLS
 377                  * in case, chase referral (not implemented yet)
 378                  */
 379                 int             msgid;
 380
 381                 if ( protocol == 0 ) {
 382                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 383                                         (void *)&protocol );
 384                 }
 385
 386                 if ( protocol < LDAP_VERSION3 ) {
 387                         /* we should rather bail out... */
 388                         rc = LDAP_UNWILLING_TO_PERFORM;
 389                         *text = "invalid protocol version";
 390                 }
 391
 392                 if ( rc == LDAP_SUCCESS ) {
 393                         rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 394                 }
 395
 396                 if ( rc == LDAP_SUCCESS ) {
 397                         LDAPMessage     *res = NULL;
 398                         struct timeval  tv;
 399
 400                         LDAP_BACK_TV_SET( &tv );
 401
 402 retry:;
 403                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 404                         if ( rc < 0 ) {
 405                                 rc = LDAP_UNAVAILABLE;
 406
 407                         } else if ( rc == 0 ) {
 408                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 409                                         ldap_pvt_thread_yield();
 410                                         if ( retries > 0 ) {
 411                                                 retries--;
 412                                         }
 413                                         LDAP_BACK_TV_SET( &tv );
 414                                         goto retry;
 415                                 }
 416                                 rc = LDAP_UNAVAILABLE;
 417
 418                         } else if ( rc == LDAP_RES_EXTENDED ) {
 419                                 struct berval   *data = NULL;
 420
 421                                 rc = ldap_parse_extended_result( ld, res,
 422                                                 NULL, &data, 0 );
 423                                 if ( rc == LDAP_SUCCESS ) {
 424                                         int err;
 425                                         rc = ldap_parse_result( ld, res, &err,
 426                                                 NULL, NULL, NULL, NULL, 1 );
 427                                         if ( rc == LDAP_SUCCESS ) {
 428                                                 rc = err;
 429                                         }
 430                                         res = NULL;
 431
 432                                         /* FIXME: in case a referral
 433                                          * is returned, should we try
 434                                          * using it instead of the
 435                                          * configured URI? */
 436                                         if ( rc == LDAP_SUCCESS ) {
 437                                                 rc = ldap_install_tls( ld );
 438
 439                                         } else if ( rc == LDAP_REFERRAL ) {
 440                                                 rc = LDAP_UNWILLING_TO_PERFORM;
 441                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 442                                         }
 443
 444                                         if ( data ) {
 445                                                 if ( data->bv_val ) {
 446                                                         ber_memfree( data->bv_val );
 447                                                 }
 448                                                 ber_memfree( data );
 449                                         }
 450                                 }
 451
 452                         } else {
 453                                 rc = LDAP_OTHER;
 454                         }
 455
 456                         if ( res != NULL ) {
 457                                 ldap_msgfree( res );
 458                         }
 459                 }
 460 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 461                 /*
 462                  * use synchronous StartTLS
 463                  */
 464                 rc = ldap_start_tls_s( ld, NULL, NULL );
 465 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 466
 467                 /* if StartTLS is requested, only attempt it if the URL
 468                  * is not "ldaps://"; this may occur not only in case
 469                  * of misconfiguration, but also when used in the chain
 470                  * overlay, where the "uri" can be parsed out of a referral */
 471                 switch ( rc ) {
 472                 case LDAP_SUCCESS:
 473                         *is_tls = 1;
 474                         break;
 475
 476                 case LDAP_SERVER_DOWN:
 477                         break;
 478
 479                 default:
 480                         if ( LDAP_BACK_TLS_CRITICAL( &dummy ) ) {
 481                                 *text = "could not start TLS";
 482                                 break;
 483                         }
 484
 485                         /* in case Start TLS is not critical */
 486                         *is_tls = 0;
 487                         rc = LDAP_SUCCESS;
 488                         break;
 489                 }
 490
 491         } else {
 492                 *is_tls = 0;
 493         }
 494
 495         return rc;
 496 }
 497 #endif /* HAVE_TLS */
 498
 499 static int
 500 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 501 {
 502         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 503         int             version;
 504         LDAP            *ld = NULL;
 505 #ifdef HAVE_TLS
 506         int             is_tls = op->o_conn->c_is_tls;
 507 #endif /* HAVE_TLS */
 508
 509         assert( lcp != NULL );
 510
 511         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 512         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 513         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 514         if ( rs->sr_err != LDAP_SUCCESS ) {
 515                 goto error_return;
 516         }
 517
 518         if ( li->li_urllist_f ) {
 519                 ldap_set_urllist_proc( ld, li->li_urllist_f, li->li_urllist_p );
 520         }
 521
 522         /* Set LDAP version. This will always succeed: If the client
 523          * bound with a particular version, then so can we.
 524          */
 525         if ( li->li_version != 0 ) {
 526                 version = li->li_version;
 527
 528         } else if ( op->o_protocol != 0 ) {
 529                 version = op->o_protocol;
 530
 531         } else {
 532                 /* assume it's an internal op; set to LDAPv3 */
 533                 version = LDAP_VERSION3;
 534         }
 535         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&version );
 536
 537         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 538         ldap_set_option( ld, LDAP_OPT_REFERRALS,
 539                 LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 540
 541         if ( li->li_network_timeout > 0 ) {
 542                 struct timeval          tv;
 543
 544                 tv.tv_sec = li->li_network_timeout;
 545                 tv.tv_usec = 0;
 546                 ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
 547         }
 548
 549 #ifdef HAVE_TLS
 550         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 551         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 552                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 553         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 554         if ( rs->sr_err != LDAP_SUCCESS ) {
 555                 ldap_unbind_ext( ld, NULL, NULL );
 556                 goto error_return;
 557         }
 558 #endif /* HAVE_TLS */
 559
 560         if ( *lcp == NULL ) {
 561                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 562                 (*lcp)->lc_flags = li->li_flags;
 563         }
 564         (*lcp)->lc_ld = ld;
 565         (*lcp)->lc_refcnt = 1;
 566         (*lcp)->lc_binding = 1;
 567 #ifdef HAVE_TLS
 568         if ( is_tls ) {
 569                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 570         } else {
 571                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 572         }
 573 #endif /* HAVE_TLS */
 574
 575 error_return:;
 576         if ( rs->sr_err != LDAP_SUCCESS ) {
 577                 rs->sr_err = slap_map_api2result( rs );
 578                 if ( sendok & LDAP_BACK_SENDERR ) {
 579                         if ( rs->sr_text == NULL ) {
 580                                 rs->sr_text = "ldap_initialize() failed";
 581                         }
 582                         send_ldap_result( op, rs );
 583                         rs->sr_text = NULL;
 584                 }
 585
 586         } else {
 587                 if ( li->li_conn_ttl > 0 ) {
 588                         (*lcp)->lc_create_time = op->o_time;
 589                 }
 590         }
 591
 592         return rs->sr_err;
 593 }
 594
 595 ldapconn_t *
 596 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 597 {
 598         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 599         ldapconn_t      *lc = NULL,
 600                         lc_curr = { 0 };
 601         int             refcnt = 1, binding = 1;
 602
 603         /* if the server is quarantined, and
 604          * - the current interval did not expire yet, or
 605          * - no more retries should occur,
 606          * don't return the connection */
 607         if ( li->li_isquarantined ) {
 608                 slap_retry_info_t       *ri = &li->li_quarantine;
 609                 int                     dont_retry = 1;
 610
 611                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 612                 if ( li->li_isquarantined == LDAP_BACK_FQ_YES ) {
 613                         dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
 614                                 || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
 615                         if ( !dont_retry ) {
 616                                 Debug( LDAP_DEBUG_ANY,
 617                                         "%s: ldap_back_getconn quarantine "
 618                                         "retry block #%d try #%d.\n",
 619                                         op->o_log_prefix, ri->ri_idx, ri->ri_count );
 620                                 li->li_isquarantined = LDAP_BACK_FQ_RETRYING;
 621                         }
 622                 }
 623                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 624
 625                 if ( dont_retry ) {
 626                         rs->sr_err = LDAP_UNAVAILABLE;
 627                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 628                                 send_ldap_result( op, rs );
 629                         }
 630                         return NULL;
 631                 }
 632         }
 633
 634         /* Internal searches are privileged and shared. So is root. */
 635         if ( op->o_do_not_cache || be_isroot( op ) ) {
 636                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 637                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 638                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 639
 640         } else {
 641                 lc_curr.lc_local_ndn = op->o_ndn;
 642                 /* Explicit binds must not be shared */
 643                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 644                         lc_curr.lc_conn = op->o_conn;
 645
 646                 } else {
 647                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 648                 }
 649         }
 650
 651         /* Explicit Bind requests always get their own conn */
 652         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 653                 /* Searches for a ldapconn in the avl tree */
 654 retry_lock:
 655                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 656
 657                 lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 658                                 (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 659                 if ( lc != NULL ) {
 660                         /* Don't reuse connections while they're still binding */
 661                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 662                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 663                                 ldap_pvt_thread_yield();
 664                                 goto retry_lock;
 665                         }
 666
 667                         refcnt = ++lc->lc_refcnt;
 668                         binding = ++lc->lc_binding;
 669                 }
 670                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 671         }
 672
 673         /* Looks like we didn't get a bind. Open a new session... */
 674         if ( lc == NULL ) {
 675                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 676                         return NULL;
 677                 }
 678                 if ( sendok & LDAP_BACK_BINDING ) {
 679                         LDAP_BACK_CONN_BINDING_SET( lc );
 680                 }
 681                 lc->lc_conn = lc_curr.lc_conn;
 682                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 683
 684                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 685                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 686                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 687                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 688
 689                 } else {
 690                         BER_BVZERO( &lc->lc_cred );
 691                         BER_BVZERO( &lc->lc_bound_ndn );
 692                         if ( !BER_BVISEMPTY( &op->o_ndn )
 693                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 694                         {
 695                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 696                         }
 697                 }
 698
 699 #ifdef HAVE_TLS
 700                 /* if start TLS failed but it was not mandatory,
 701                  * check if the non-TLS connection was already
 702                  * in cache; in case, destroy the newly created
 703                  * connection and use the existing one */
 704                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 705                                 && !ldap_tls_inplace( lc->lc_ld ) )
 706                 {
 707                         ldapconn_t *tmplc;
 708
 709                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 710                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 711                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 712                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 713                         if ( tmplc != NULL ) {
 714                                 refcnt = ++tmplc->lc_refcnt;
 715                                 binding = ++tmplc->lc_binding;
 716                                 ldap_back_conn_free( lc );
 717                                 lc = tmplc;
 718                         }
 719                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 720
 721                         if ( tmplc != NULL ) {
 722                                 goto done;
 723                         }
 724                 }
 725 #endif /* HAVE_TLS */
 726
 727                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 728
 729                 /* Inserts the newly created ldapconn in the avl tree */
 730                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 731
 732                 assert( lc->lc_refcnt == 1 );
 733                 assert( lc->lc_binding == 1 );
 734                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 735                         ldap_back_conndn_cmp, ldap_back_conndn_dup );
 736
 737 #if PRINT_CONNTREE > 0
 738                 myprint( li->li_conninfo.lai_tree, "ldap_back_getconn" );
 739 #endif /* PRINT_CONNTREE */
 740
 741                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 742
 743                 Debug( LDAP_DEBUG_TRACE,
 744                         "=>ldap_back_getconn: conn %p inserted refcnt=%u binding=%u\n",
 745                         (void *)lc, refcnt, binding );
 746
 747                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 748                 switch ( rs->sr_err ) {
 749                 case 0:
 750                         break;
 751
 752                 case -1:
 753                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 754                                 /* duplicate: free and try to get the newly created one */
 755                                 goto retry_lock;
 756                         }
 757                         /* taint connection, so that it'll be freed when released */
 758                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 759                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 760                                         ldap_back_conndnlc_cmp );
 761                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 762                         LDAP_BACK_CONN_TAINTED_SET( lc );
 763                         break;
 764
 765                 default:
 766                         ldap_back_conn_free( lc );
 767                         rs->sr_err = LDAP_OTHER;
 768                         rs->sr_text = "proxy bind collision";
 769                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 770                                 send_ldap_result( op, rs );
 771                                 rs->sr_text = NULL;
 772                         }
 773                         return NULL;
 774                 }
 775
 776         } else {
 777                 int     expiring = 0;
 778
 779                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
 780                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
 781                 {
 782                         expiring = 1;
 783
 784                         /* let it be used, but taint/delete it so that
 785                          * no-one else can look it up any further */
 786                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 787                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 788                                         ldap_back_conndnlc_cmp );
 789                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 790                         LDAP_BACK_CONN_TAINTED_SET( lc );
 791                 }
 792
 793                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 794                         char    buf[ SLAP_TEXT_BUFLEN ];
 795
 796                         snprintf( buf, sizeof( buf ),
 797                                 "conn %p fetched refcnt=%u binding=%u%s",
 798                                 (void *)lc, refcnt, binding, expiring ? " expiring" : "" );
 799                         Debug( LDAP_DEBUG_TRACE,
 800                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
 801                 }
 802         }
 803
 804 #ifdef HAVE_TLS
 805 done:;
 806 #endif /* HAVE_TLS */
 807         if ( li->li_idle_timeout && lc ) {
 808                 lc->lc_time = op->o_time;
 809         }
 810
 811         return lc;
 812 }
 813
 814 void
 815 ldap_back_release_conn_lock(
 816         Operation               *op,
 817         SlapReply               *rs,
 818         ldapconn_t              *lc,
 819         int                     dolock )
 820 {
 821         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 822
 823         if ( dolock ) {
 824                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 825         }
 826         assert( lc->lc_refcnt > 0 );
 827         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 828         lc->lc_refcnt--;
 829         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
 830                 ldap_back_freeconn( op, lc, 0 );
 831         }
 832         if ( dolock ) {
 833                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 834         }
 835 }
 836
 837 void
 838 ldap_back_quarantine(
 839         Operation       *op,
 840         SlapReply       *rs,
 841         int             dolock )
 842 {
 843         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 844
 845         slap_retry_info_t       *ri = &li->li_quarantine;
 846
 847         if ( dolock ) {
 848                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 849         }
 850
 851         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
 852                 switch ( li->li_isquarantined ) {
 853                 case LDAP_BACK_FQ_NO:
 854                         Debug( LDAP_DEBUG_ANY,
 855                                 "%s: ldap_back_quarantine enter.\n",
 856                                 op->o_log_prefix, 0, 0 );
 857
 858                         ri->ri_idx = 0;
 859                         ri->ri_count = 0;
 860                         break;
 861
 862                 case LDAP_BACK_FQ_RETRYING:
 863                         Debug( LDAP_DEBUG_ANY,
 864                                 "%s: ldap_back_quarantine block #%d try #%d failed.\n",
 865                                 op->o_log_prefix, ri->ri_idx, ri->ri_count );
 866
 867                         ++ri->ri_count;
 868                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
 869                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
 870                         {
 871                                 ri->ri_count = 0;
 872                                 ++ri->ri_idx;
 873                         }
 874                         break;
 875
 876                 default:
 877                         break;
 878                 }
 879
 880                 li->li_isquarantined = LDAP_BACK_FQ_YES;
 881                 ri->ri_last = slap_get_time();
 882
 883         } else if ( li->li_isquarantined != LDAP_BACK_FQ_NO ) {
 884                 Debug( LDAP_DEBUG_ANY,
 885                         "%s: ldap_back_quarantine exit.\n",
 886                         op->o_log_prefix, ri->ri_idx, ri->ri_count );
 887
 888                 ri->ri_count = 0;
 889                 ri->ri_idx = 0;
 890                 li->li_isquarantined = LDAP_BACK_FQ_NO;
 891         }
 892
 893         if ( dolock ) {
 894                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 895         }
 896 }
 897
 898 /*
 899  * ldap_back_dobind
 900  *
 901  * Note: as the check for the value of lc->lc_bound was already here, I removed
 902  * it from all the callers, and I made the function return the flag, so
 903  * it can be used to simplify the check.
 904  *
 905  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 906  */
 907 static int
 908 ldap_back_dobind_int(
 909         ldapconn_t              *lc,
 910         Operation               *op,
 911         SlapReply               *rs,
 912         ldap_back_send_t        sendok,
 913         int                     retries,
 914         int                     dolock )
 915 {
 916         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 917
 918         int             rc, binding = 0;
 919         ber_int_t       msgid;
 920
 921         assert( retries >= 0 );
 922
 923 retry_lock:;
 924         if ( dolock ) {
 925                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 926         }
 927
 928         if ( binding == 0 ) {
 929                 /* check if already bound */
 930                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 931                 if ( rc ) {
 932                         lc->lc_binding--;
 933                         if ( dolock ) {
 934                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 935                         }
 936                         return rc;
 937                 }
 938
 939                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 940                         /* if someone else is about to bind it, give up and retry */
 941                         if ( dolock ) {
 942                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 943                         }
 944                         ldap_pvt_thread_yield();
 945                         goto retry_lock;
 946
 947                 } else {
 948                         /* otherwise this thread will bind it */
 949                         LDAP_BACK_CONN_BINDING_SET( lc );
 950                         binding = 1;
 951                 }
 952         }
 953
 954         /* wait for pending operations to finish */
 955         /* FIXME: may become a bottleneck! */
 956         if ( lc->lc_refcnt != lc->lc_binding ) {
 957                 if ( dolock ) {
 958                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 959                 }
 960                 ldap_pvt_thread_yield();
 961                 goto retry_lock;
 962         }
 963
 964         if ( dolock ) {
 965                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 966         }
 967
 968 #if 0
 969         while ( lc->lc_refcnt > 1 ) {
 970                 ldap_pvt_thread_yield();
 971                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 972                 if ( rc ) {
 973                         return rc;
 974                 }
 975         }
 976
 977         if ( dolock ) {
 978                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 979         }
 980         LDAP_BACK_CONN_BINDING_SET( lc );
 981         if ( dolock ) {
 982                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 983         }
 984 #endif
 985
 986         /*
 987          * FIXME: we need to let clients use proxyAuthz
 988          * otherwise we cannot do symmetric pools of servers;
 989          * we have to live with the fact that a user can
 990          * authorize itself as any ID that is allowed
 991          * by the authzTo directive of the "proxyauthzdn".
 992          */
 993         /*
 994          * NOTE: current Proxy Authorization specification
 995          * and implementation do not allow proxy authorization
 996          * control to be provided with Bind requests
 997          */
 998         /*
 999          * if no bind took place yet, but the connection is bound
1000          * and the "idassert-authcDN" (or other ID) is set,
1001          * then bind as the asserting identity and explicitly
1002          * add the proxyAuthz control to every operation with the
1003          * dn bound to the connection as control value.
1004          * This is done also if this is the authrizing backend,
1005          * but the "override" flag is given to idassert.
1006          * It allows to use SASL bind and yet proxyAuthz users
1007          */
1008         if ( op->o_conn != NULL &&
1009                 !op->o_do_not_cache &&
1010                 ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
1011                         ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
1012         {
1013                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok );
1014                 goto done;
1015         }
1016
1017 #ifdef HAVE_CYRUS_SASL
1018         if ( LDAP_BACK_CONN_ISPRIV( lc )
1019                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
1020         {
1021                 void            *defaults = NULL;
1022
1023                 if ( li->li_acl_secprops != NULL ) {
1024                         rc = ldap_set_option( lc->lc_ld,
1025                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops );
1026
1027                         if ( rc != LDAP_OPT_SUCCESS ) {
1028                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
1029                                         "(SECPROPS,\"%s\") failed!\n",
1030                                         li->li_acl_secprops, 0, 0 );
1031                                 goto done;
1032                         }
1033                 }
1034
1035                 defaults = lutil_sasl_defaults( lc->lc_ld,
1036                                 li->li_acl_sasl_mech.bv_val,
1037                                 li->li_acl_sasl_realm.bv_val,
1038                                 li->li_acl_authcID.bv_val,
1039                                 li->li_acl_passwd.bv_val,
1040                                 NULL );
1041
1042                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
1043                                 li->li_acl_authcDN.bv_val,
1044                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
1045                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1046                                 defaults );
1047
1048                 lutil_sasl_freedefs( defaults );
1049
1050                 rs->sr_err = slap_map_api2result( rs );
1051                 if ( rs->sr_err != LDAP_SUCCESS ) {
1052                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1053                         send_ldap_result( op, rs );
1054
1055                 } else {
1056                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1057                 }
1058                 goto done;
1059         }
1060 #endif /* HAVE_CYRUS_SASL */
1061
1062 retry:;
1063         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1064                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1065                         LDAP_SASL_SIMPLE, &lc->lc_cred,
1066                         NULL, NULL, &msgid );
1067
1068         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
1069                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
1070                         if ( dolock ) {
1071                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1072                         }
1073
1074                         assert( lc->lc_refcnt > 0 );
1075                         if ( lc->lc_refcnt == 1 ) {
1076                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
1077                                 lc->lc_ld = NULL;
1078
1079                                 /* lc here must be the regular lc, reset and ready for init */
1080                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
1081                                 if ( rs->sr_err != LDAP_SUCCESS ) {
1082                                         lc->lc_binding--;
1083                                         lc->lc_refcnt = 0;
1084                                 }
1085                         }
1086
1087                         if ( dolock ) {
1088                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1089                         }
1090
1091                         if ( rs->sr_err == LDAP_SUCCESS ) {
1092                                 if ( retries > 0 ) {
1093                                         retries--;
1094                                 }
1095                                 goto retry;
1096                         }
1097
1098                 } else {
1099                         if ( dolock ) {
1100                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1101                         }
1102                         lc->lc_binding--;
1103                         if ( dolock ) {
1104                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1105                         }
1106                 }
1107
1108                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1109                         ldap_back_quarantine( op, rs, dolock );
1110                 }
1111
1112                 /* FIXME: one binding-- too many? */
1113                 lc->lc_binding--;
1114                 ldap_back_freeconn( op, lc, dolock );
1115                 rs->sr_err = slap_map_api2result( rs );
1116
1117                 return 0;
1118         }
1119
1120         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1121         if ( rc == LDAP_SUCCESS ) {
1122                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1123         }
1124
1125 done:;
1126         if ( LDAP_BACK_QUARANTINE( li ) ) {
1127                 ldap_back_quarantine( op, rs, dolock );
1128         }
1129
1130         lc->lc_binding--;
1131         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1132         rc = LDAP_BACK_CONN_ISBOUND( lc );
1133         if ( !rc ) {
1134                 ldap_back_release_conn_lock( op, rs, lc, dolock );
1135         }
1136
1137         return rc;
1138 }
1139
1140 int
1141 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1142 {
1143         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1144
1145         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
1146 }
1147
1148 /*
1149  * ldap_back_default_rebind
1150  *
1151  * This is a callback used for chasing referrals using the same
1152  * credentials as the original user on this session.
1153  */
1154 int
1155 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1156         ber_int_t msgid, void *params )
1157 {
1158         ldapconn_t      *lc = (ldapconn_t *)params;
1159
1160 #ifdef HAVE_TLS
1161         /* ... otherwise we couldn't get here */
1162         assert( lc != NULL );
1163
1164         if ( !ldap_tls_inplace( ld ) ) {
1165                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1166                                 rc;
1167                 const char      *text = NULL;
1168
1169                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1170                         LDAP_BACK_RETRY_DEFAULT, &text );
1171                 if ( rc != LDAP_SUCCESS ) {
1172                         return rc;
1173                 }
1174         }
1175 #endif /* HAVE_TLS */
1176
1177         /* FIXME: add checks on the URL/identity? */
1178
1179         return ldap_sasl_bind_s( ld,
1180                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1181                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1182 }
1183
1184 /*
1185  * ldap_back_default_urllist
1186  */
1187 int
1188 ldap_back_default_urllist(
1189         LDAP            *ld,
1190         LDAPURLDesc     **urllist,
1191         LDAPURLDesc     **url,
1192         void            *params )
1193 {
1194         ldapinfo_t      *li = (ldapinfo_t *)params;
1195         LDAPURLDesc     **urltail;
1196
1197         if ( urllist == url ) {
1198                 return LDAP_SUCCESS;
1199         }
1200
1201         for ( urltail = &(*url)->lud_next; *urltail; urltail = &(*urltail)->lud_next )
1202                 /* count */ ;
1203
1204         *urltail = *urllist;
1205         *urllist = *url;
1206         *url = NULL;
1207
1208         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1209         if ( li->li_uri ) {
1210                 ch_free( li->li_uri );
1211         }
1212
1213         ldap_get_option( ld, LDAP_OPT_URI, (void *)&li->li_uri );
1214         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1215
1216         return LDAP_SUCCESS;
1217 }
1218
1219 int
1220 ldap_back_cancel(
1221                 ldapconn_t              *lc,
1222                 Operation               *op,
1223                 SlapReply               *rs,
1224                 ber_int_t               msgid,
1225                 ldap_back_send_t        sendok )
1226 {
1227         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1228
1229         /* default behavior */
1230         if ( LDAP_BACK_ABANDON( li ) ) {
1231                 return ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1232         }
1233
1234         if ( LDAP_BACK_IGNORE( li ) ) {
1235                 return LDAP_SUCCESS;
1236         }
1237
1238         if ( LDAP_BACK_CANCEL( li ) ) {
1239                 /* FIXME: asynchronous? */
1240                 return ldap_cancel_s( lc->lc_ld, msgid, NULL, NULL );
1241         }
1242
1243         assert( 0 );
1244
1245         return LDAP_OTHER;
1246 }
1247
1248 int
1249 ldap_back_op_result(
1250                 ldapconn_t              *lc,
1251                 Operation               *op,
1252                 SlapReply               *rs,
1253                 ber_int_t               msgid,
1254                 time_t                  timeout,
1255                 ldap_back_send_t        sendok )
1256 {
1257         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1258
1259         char            *match = NULL;
1260         LDAPMessage     *res = NULL;
1261         char            *text = NULL;
1262         char            **refs = NULL;
1263         LDAPControl     **ctrls = NULL;
1264
1265 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1266
1267         rs->sr_text = NULL;
1268         rs->sr_matched = NULL;
1269         rs->sr_ref = NULL;
1270         rs->sr_ctrls = NULL;
1271
1272         /* if the error recorded in the reply corresponds
1273          * to a successful state, get the error from the
1274          * remote server response */
1275         if ( ERR_OK( rs->sr_err ) ) {
1276                 int             rc;
1277                 struct timeval  tv;
1278
1279                 if ( timeout ) {
1280                         tv.tv_sec = timeout;
1281                         tv.tv_usec = 0;
1282
1283                 } else {
1284                         LDAP_BACK_TV_SET( &tv );
1285                 }
1286
1287 retry:;
1288                 /* if result parsing fails, note the failure reason */
1289                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1290                 switch ( rc ) {
1291                 case 0:
1292                         if ( timeout ) {
1293                                 (void)ldap_back_cancel( lc, op, rs, msgid, sendok );
1294                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
1295                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
1296                                 rs->sr_text = "Operation timed out";
1297                                 break;
1298                         }
1299
1300                         LDAP_BACK_TV_SET( &tv );
1301                         ldap_pvt_thread_yield();
1302                         goto retry;
1303
1304                 case -1:
1305                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1306                                         &rs->sr_err );
1307                         break;
1308
1309
1310                 /* otherwise get the result; if it is not
1311                  * LDAP_SUCCESS, record it in the reply
1312                  * structure (this includes
1313                  * LDAP_COMPARE_{TRUE|FALSE}) */
1314                 default:
1315                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1316                                         &match, &text, &refs, &ctrls, 1 );
1317                         rs->sr_text = text;
1318                         if ( rc != LDAP_SUCCESS ) {
1319                                 rs->sr_err = rc;
1320                         }
1321                         if ( refs != NULL ) {
1322                                 int     i;
1323
1324                                 for ( i = 0; refs[ i ] != NULL; i++ )
1325                                         /* count */ ;
1326                                 rs->sr_ref = op->o_tmpalloc( sizeof( struct berval ) * ( i + 1 ),
1327                                         op->o_tmpmemctx );
1328                                 for ( i = 0; refs[ i ] != NULL; i++ ) {
1329                                         ber_str2bv( refs[ i ], 0, 0, &rs->sr_ref[ i ] );
1330                                 }
1331                                 BER_BVZERO( &rs->sr_ref[ i ] );
1332                         }
1333                         if ( ctrls != NULL ) {
1334                                 rs->sr_ctrls = ctrls;
1335                         }
1336                 }
1337         }
1338
1339         /* if the error in the reply structure is not
1340          * LDAP_SUCCESS, try to map it from client
1341          * to server error */
1342         if ( !ERR_OK( rs->sr_err ) ) {
1343                 rs->sr_err = slap_map_api2result( rs );
1344
1345                 /* internal ops ( op->o_conn == NULL )
1346                  * must not reply to client */
1347                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1348
1349                         /* record the (massaged) matched
1350                          * DN into the reply structure */
1351                         rs->sr_matched = match;
1352                 }
1353         }
1354         if ( LDAP_BACK_QUARANTINE( li ) ) {
1355                 ldap_back_quarantine( op, rs, 1 );
1356         }
1357         if ( op->o_conn &&
1358                 ( ( sendok & LDAP_BACK_SENDOK )
1359                         || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1360         {
1361                 send_ldap_result( op, rs );
1362         }
1363         if ( match ) {
1364                 if ( rs->sr_matched != match ) {
1365                         free( (char *)rs->sr_matched );
1366                 }
1367                 rs->sr_matched = NULL;
1368                 ldap_memfree( match );
1369         }
1370         if ( text ) {
1371                 ldap_memfree( text );
1372         }
1373         rs->sr_text = NULL;
1374         if ( rs->sr_ref ) {
1375                 assert( refs != NULL );
1376                 ber_memvfree( (void **)refs );
1377                 op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
1378                 rs->sr_ref = NULL;
1379         }
1380         if ( ctrls ) {
1381                 assert( rs->sr_ctrls != NULL );
1382                 ldap_controls_free( ctrls );
1383                 rs->sr_ctrls = NULL;
1384         }
1385         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1386 }
1387
1388 /* return true if bound, false if failed */
1389 int
1390 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1391 {
1392         int             rc = 0;
1393         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1394
1395         assert( lcp != NULL );
1396         assert( *lcp != NULL );
1397
1398         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1399
1400         if ( (*lcp)->lc_refcnt == 1 ) {
1401                 ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1402                 Debug( LDAP_DEBUG_ANY,
1403                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1404                         op->o_log_prefix, li->li_uri,
1405                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1406                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1407                 ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1408
1409                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1410                 (*lcp)->lc_ld = NULL;
1411                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1412
1413                 /* lc here must be the regular lc, reset and ready for init */
1414                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1415                 if ( rc != LDAP_SUCCESS ) {
1416                         rc = 0;
1417                         /* freeit, because lc_refcnt == 1 */
1418                         (void)ldap_back_conn_free( *lcp );
1419                         *lcp = NULL;
1420
1421                 } else {
1422                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1423                         if ( rc == 0 && *lcp != NULL ) {
1424                                 /* freeit, because lc_refcnt == 1 */
1425                                 (void)ldap_back_conn_free( *lcp );
1426                                 *lcp = NULL;
1427                         }
1428                 }
1429
1430         } else {
1431                 Debug( LDAP_DEBUG_TRACE,
1432                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1433                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1434
1435                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1436                 *lcp = NULL;
1437
1438                 if ( sendok ) {
1439                         rs->sr_err = LDAP_UNAVAILABLE;
1440                         rs->sr_text = "unable to retry";
1441                         send_ldap_result( op, rs );
1442                 }
1443         }
1444
1445         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1446
1447         return rc;
1448 }
1449
1450 static int
1451 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1452 {
1453         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1454         struct berval   binddn = slap_empty_bv;
1455         struct berval   bindcred = slap_empty_bv;
1456         struct berval   ndn;
1457         int             dobind = 0;
1458         int             msgid;
1459         int             rc;
1460
1461         /* don't proxyAuthz if protocol is not LDAPv3 */
1462         switch ( li->li_version ) {
1463         case LDAP_VERSION3:
1464                 break;
1465
1466         case 0:
1467                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1468                         break;
1469                 }
1470                 /* fall thru */
1471
1472         default:
1473                 goto done;
1474         }
1475
1476         if ( op->o_tag == LDAP_REQ_BIND ) {
1477                 ndn = op->o_req_ndn;
1478
1479         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1480                 ndn = op->o_conn->c_ndn;
1481
1482         } else {
1483                 ndn = op->o_ndn;
1484         }
1485
1486         /*
1487          * FIXME: we need to let clients use proxyAuthz
1488          * otherwise we cannot do symmetric pools of servers;
1489          * we have to live with the fact that a user can
1490          * authorize itself as any ID that is allowed
1491          * by the authzTo directive of the "proxyauthzdn".
1492          */
1493         /*
1494          * NOTE: current Proxy Authorization specification
1495          * and implementation do not allow proxy authorization
1496          * control to be provided with Bind requests
1497          */
1498         /*
1499          * if no bind took place yet, but the connection is bound
1500          * and the "proxyauthzdn" is set, then bind as
1501          * "proxyauthzdn" and explicitly add the proxyAuthz
1502          * control to every operation with the dn bound
1503          * to the connection as control value.
1504          */
1505
1506         /* bind as proxyauthzdn only if no idassert mode
1507          * is requested, or if the client's identity
1508          * is authorized */
1509         switch ( li->li_idassert_mode ) {
1510         case LDAP_BACK_IDASSERT_LEGACY:
1511                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1512                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1513                         {
1514                                 binddn = li->li_idassert_authcDN;
1515                                 bindcred = li->li_idassert_passwd;
1516                                 dobind = 1;
1517                         }
1518                 }
1519                 break;
1520
1521         default:
1522                 /* NOTE: rootdn can always idassert */
1523                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1524                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1525                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1526                                 if ( sendok & LDAP_BACK_SENDERR ) {
1527                                         send_ldap_result( op, rs );
1528                                 }
1529                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1530
1531                         } else {
1532                                 rs->sr_err = LDAP_SUCCESS;
1533                                 binddn = slap_empty_bv;
1534                                 bindcred = slap_empty_bv;
1535                                 break;
1536                         }
1537
1538                         goto done;
1539
1540                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1541                         struct berval authcDN;
1542
1543                         if ( BER_BVISNULL( &ndn ) ) {
1544                                 authcDN = slap_empty_bv;
1545
1546                         } else {
1547                                 authcDN = ndn;
1548                         }
1549                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1550                                         &authcDN, &authcDN );
1551                         if ( rs->sr_err != LDAP_SUCCESS ) {
1552                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1553                                         if ( sendok & LDAP_BACK_SENDERR ) {
1554                                                 send_ldap_result( op, rs );
1555                                         }
1556                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1557
1558                                 } else {
1559                                         rs->sr_err = LDAP_SUCCESS;
1560                                         binddn = slap_empty_bv;
1561                                         bindcred = slap_empty_bv;
1562                                         break;
1563                                 }
1564
1565                                 goto done;
1566                         }
1567                 }
1568
1569                 binddn = li->li_idassert_authcDN;
1570                 bindcred = li->li_idassert_passwd;
1571                 dobind = 1;
1572                 break;
1573         }
1574
1575         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1576 #ifdef HAVE_CYRUS_SASL
1577                 void            *defaults = NULL;
1578                 struct berval   authzID = BER_BVNULL;
1579                 int             freeauthz = 0;
1580
1581                 /* if SASL supports native authz, prepare for it */
1582                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1583                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1584                 {
1585                         switch ( li->li_idassert_mode ) {
1586                         case LDAP_BACK_IDASSERT_OTHERID:
1587                         case LDAP_BACK_IDASSERT_OTHERDN:
1588                                 authzID = li->li_idassert_authzID;
1589                                 break;
1590
1591                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1592                                 BER_BVSTR( &authzID, "dn:" );
1593                                 break;
1594
1595                         case LDAP_BACK_IDASSERT_SELF:
1596                                 if ( BER_BVISNULL( &ndn ) ) {
1597                                         /* connection is not authc'd, so don't idassert */
1598                                         BER_BVSTR( &authzID, "dn:" );
1599                                         break;
1600                                 }
1601                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1602                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1603                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1604                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1605                                                 ndn.bv_val, ndn.bv_len + 1 );
1606                                 freeauthz = 1;
1607                                 break;
1608
1609                         default:
1610                                 break;
1611                         }
1612                 }
1613
1614                 if ( li->li_idassert_secprops != NULL ) {
1615                         rs->sr_err = ldap_set_option( lc->lc_ld,
1616                                 LDAP_OPT_X_SASL_SECPROPS,
1617                                 (void *)li->li_idassert_secprops );
1618
1619                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1620                                 rs->sr_err = LDAP_OTHER;
1621                                 if ( sendok & LDAP_BACK_SENDERR ) {
1622                                         send_ldap_result( op, rs );
1623                                 }
1624                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1625                                 goto done;
1626                         }
1627                 }
1628
1629                 defaults = lutil_sasl_defaults( lc->lc_ld,
1630                                 li->li_idassert_sasl_mech.bv_val,
1631                                 li->li_idassert_sasl_realm.bv_val,
1632                                 li->li_idassert_authcID.bv_val,
1633                                 li->li_idassert_passwd.bv_val,
1634                                 authzID.bv_val );
1635
1636                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1637                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1638                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1639                                 defaults );
1640
1641                 rs->sr_err = slap_map_api2result( rs );
1642                 if ( rs->sr_err != LDAP_SUCCESS ) {
1643                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1644                         if ( sendok & LDAP_BACK_SENDERR ) {
1645                                 send_ldap_result( op, rs );
1646                         }
1647
1648                 } else {
1649                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1650                 }
1651
1652                 lutil_sasl_freedefs( defaults );
1653                 if ( freeauthz ) {
1654                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1655                 }
1656
1657                 goto done;
1658 #endif /* HAVE_CYRUS_SASL */
1659         }
1660
1661         switch ( li->li_idassert_authmethod ) {
1662         case LDAP_AUTH_NONE:
1663                 rc = LDAP_SUCCESS;
1664                 break;
1665
1666         case LDAP_AUTH_SIMPLE:
1667                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1668                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1669                                 &bindcred, NULL, NULL, &msgid );
1670                 rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1671                 break;
1672
1673         default:
1674                 /* unsupported! */
1675                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1676                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1677                 if ( sendok & LDAP_BACK_SENDERR ) {
1678                         send_ldap_result( op, rs );
1679                 }
1680                 goto done;
1681         }
1682
1683         if ( rc == LDAP_SUCCESS ) {
1684                 /* set rebind stuff in case of successful proxyAuthz bind,
1685                  * so that referral chasing is attempted using the right
1686                  * identity */
1687                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1688                 ber_dupbv( &lc->lc_bound_ndn, &binddn );
1689
1690                 if ( LDAP_BACK_SAVECRED( li ) ) {
1691                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
1692                                 memset( lc->lc_cred.bv_val, 0,
1693                                                 lc->lc_cred.bv_len );
1694                         }
1695                         ber_bvreplace( &lc->lc_cred, &bindcred );
1696                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
1697                 }
1698         }
1699 done:;
1700         return LDAP_BACK_CONN_ISBOUND( lc );
1701 }
1702
1703 /*
1704  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1705  * to existing server-side controls if required; if not,
1706  * the existing server-side controls are placed in *pctrls.
1707  * The caller, after using the controls in client API
1708  * operations, if ( *pctrls != op->o_ctrls ), should
1709  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1710  * The function returns success if the control could
1711  * be added if required, or if it did nothing; in the future,
1712  * it might return some error if it failed.
1713  *
1714  * if no bind took place yet, but the connection is bound
1715  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1716  * and explicitly add proxyAuthz the control to every operation
1717  * with the dn bound to the connection as control value.
1718  *
1719  * If no server-side controls are defined for the operation,
1720  * simply add the proxyAuthz control; otherwise, if the
1721  * proxyAuthz control is not already set, add it as
1722  * the first one
1723  *
1724  * FIXME: is controls order significant for security?
1725  * ANSWER: controls ordering and interoperability
1726  * must be indicated by the specs of each control; if none
1727  * is specified, the order is irrelevant.
1728  */
1729 int
1730 ldap_back_proxy_authz_ctrl(
1731                 ldapconn_t      *lc,
1732                 Operation       *op,
1733                 SlapReply       *rs,
1734                 LDAPControl     ***pctrls )
1735 {
1736         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1737         LDAPControl     **ctrls = NULL;
1738         int             i = 0,
1739                         mode;
1740         struct berval   assertedID,
1741                         ndn;
1742
1743         *pctrls = NULL;
1744
1745         rs->sr_err = LDAP_SUCCESS;
1746
1747         /* don't proxyAuthz if protocol is not LDAPv3 */
1748         switch ( li->li_version ) {
1749         case LDAP_VERSION3:
1750                 break;
1751
1752         case 0:
1753                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1754                         break;
1755                 }
1756                 /* fall thru */
1757
1758         default:
1759                 goto done;
1760         }
1761
1762         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1763          * but if it is not set this test fails.  We need a different
1764          * means to detect if idassert is enabled */
1765         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1766                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1767         {
1768                 goto done;
1769         }
1770
1771         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1772                 goto done;
1773         }
1774
1775         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1776                 ndn = op->o_conn->c_ndn;
1777
1778         } else {
1779                 ndn = op->o_ndn;
1780         }
1781
1782         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1783                 if ( op->o_proxy_authz ) {
1784                         /*
1785                          * FIXME: we do not want to perform proxyAuthz
1786                          * on behalf of the client, because this would
1787                          * be performed with "proxyauthzdn" privileges.
1788                          *
1789                          * This might actually be too strict, since
1790                          * the "proxyauthzdn" authzTo, and each entry's
1791                          * authzFrom attributes may be crafted
1792                          * to avoid unwanted proxyAuthz to take place.
1793                          */
1794 #if 0
1795                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1796                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1797 #endif
1798                         goto done;
1799                 }
1800
1801                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1802                         goto done;
1803                 }
1804
1805                 if ( BER_BVISNULL( &ndn ) ) {
1806                         goto done;
1807                 }
1808
1809                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1810                         goto done;
1811                 }
1812
1813         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1814                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1815                                 /* && ( !BER_BVISNULL( &ndn )
1816                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1817                 {
1818                         /* already asserted in SASL via native authz */
1819                         /* NOTE: the test on lc->lc_bound is used to trap
1820                          * native authorization of anonymous users,
1821                          * since in that case ndn is NULL */
1822                         goto done;
1823                 }
1824
1825         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1826                 int             rc;
1827                 struct berval authcDN;
1828
1829                 if ( BER_BVISNULL( &ndn ) ) {
1830                         authcDN = slap_empty_bv;
1831                 } else {
1832                         authcDN = ndn;
1833                 }
1834                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1835                                 &authcDN, & authcDN );
1836                 if ( rc != LDAP_SUCCESS ) {
1837                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1838                         {
1839                                 /* ndn is not authorized
1840                                  * to use idassert */
1841                                 rs->sr_err = rc;
1842                         }
1843                         goto done;
1844                 }
1845         }
1846
1847         if ( op->o_proxy_authz ) {
1848                 /*
1849                  * FIXME: we can:
1850                  * 1) ignore the already set proxyAuthz control
1851                  * 2) leave it in place, and don't set ours
1852                  * 3) add both
1853                  * 4) reject the operation
1854                  *
1855                  * option (4) is very drastic
1856                  * option (3) will make the remote server reject
1857                  * the operation, thus being equivalent to (4)
1858                  * option (2) will likely break the idassert
1859                  * assumptions, so we cannot accept it;
1860                  * option (1) means that we are contradicting
1861                  * the client's reques.
1862                  *
1863                  * I think (4) is the only correct choice.
1864                  */
1865                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1866                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1867         }
1868
1869         if ( op->o_is_auth_check ) {
1870                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1871
1872         } else {
1873                 mode = li->li_idassert_mode;
1874         }
1875
1876         switch ( mode ) {
1877         case LDAP_BACK_IDASSERT_SELF:
1878                 if ( BER_BVISNULL( &ndn ) ) {
1879                         goto done;
1880                 }
1881                 assertedID = ndn;
1882                 break;
1883
1884         case LDAP_BACK_IDASSERT_LEGACY:
1885                 /* original behavior:
1886                  * assert the client's identity */
1887                 if ( BER_BVISNULL( &ndn ) ) {
1888                         assertedID = slap_empty_bv;
1889                 } else {
1890                         assertedID = ndn;
1891                 }
1892                 break;
1893
1894         case LDAP_BACK_IDASSERT_ANONYMOUS:
1895                 /* assert "anonymous" */
1896                 assertedID = slap_empty_bv;
1897                 break;
1898
1899         case LDAP_BACK_IDASSERT_NOASSERT:
1900                 /* don't assert; bind as proxyauthzdn */
1901                 goto done;
1902
1903         case LDAP_BACK_IDASSERT_OTHERID:
1904         case LDAP_BACK_IDASSERT_OTHERDN:
1905                 /* assert idassert DN */
1906                 assertedID = li->li_idassert_authzID;
1907                 break;
1908
1909         default:
1910                 assert( 0 );
1911         }
1912
1913         if ( BER_BVISNULL( &assertedID ) ) {
1914                 assertedID = slap_empty_bv;
1915         }
1916
1917         /* don't idassert the bound DN (ITS#4497) */
1918         if ( dn_match( &assertedID, &lc->lc_bound_ndn ) ) {
1919                 goto done;
1920         }
1921
1922         if ( op->o_ctrls ) {
1923                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1924                         /* just count ctrls */ ;
1925         }
1926
1927         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1928                         op->o_tmpmemctx );
1929         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1930
1931         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1932         ctrls[ 0 ]->ldctl_iscritical = 1;
1933
1934         switch ( li->li_idassert_mode ) {
1935         /* already in u:ID or dn:DN form */
1936         case LDAP_BACK_IDASSERT_OTHERID:
1937         case LDAP_BACK_IDASSERT_OTHERDN:
1938                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1939                 break;
1940
1941         /* needs the dn: prefix */
1942         default:
1943                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1944                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1945                                 op->o_tmpmemctx );
1946                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1947                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1948                                 assertedID.bv_val, assertedID.bv_len + 1 );
1949                 break;
1950         }
1951
1952         /* Older versions of <draft-weltman-ldapv3-proxy> required
1953          * to encode the value of the authzID (and called it proxyDN);
1954          * this hack provides compatibility with those DSAs that
1955          * implement it this way */
1956         if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
1957                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
1958                 BerElementBuffer        berbuf;
1959                 BerElement              *ber = (BerElement *)&berbuf;
1960                 ber_tag_t               tag;
1961
1962                 ber_init2( ber, 0, LBER_USE_DER );
1963                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1964
1965                 tag = ber_printf( ber, "O", &authzID );
1966                 if ( tag == LBER_ERROR ) {
1967                         rs->sr_err = LDAP_OTHER;
1968                         goto free_ber;
1969                 }
1970
1971                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1972                         rs->sr_err = LDAP_OTHER;
1973                         goto free_ber;
1974                 }
1975
1976 free_ber:;
1977                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1978                 ber_free_buf( ber );
1979
1980                 if ( rs->sr_err != LDAP_SUCCESS ) {
1981                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1982                         ctrls = NULL;
1983                         goto done;
1984                 }
1985
1986         } else if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
1987                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
1988                                         tmp;
1989                 BerElementBuffer        berbuf;
1990                 BerElement              *ber = (BerElement *)&berbuf;
1991                 ber_tag_t               tag;
1992
1993                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
1994                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1995                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1996                         ctrls = NULL;
1997                         rs->sr_err = LDAP_PROTOCOL_ERROR;
1998                         goto done;
1999                 }
2000
2001                 tmp = authzID;
2002                 tmp.bv_val += STRLENOF( "dn:" );
2003                 tmp.bv_len -= STRLENOF( "dn:" );
2004
2005                 ber_init2( ber, 0, LBER_USE_DER );
2006                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
2007
2008                 /* apparently, Mozilla API encodes this
2009                  * as "SEQUENCE { LDAPDN }" */
2010                 tag = ber_printf( ber, "{O}", &tmp );
2011                 if ( tag == LBER_ERROR ) {
2012                         rs->sr_err = LDAP_OTHER;
2013                         goto free_ber2;
2014                 }
2015
2016                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
2017                         rs->sr_err = LDAP_OTHER;
2018                         goto free_ber2;
2019                 }
2020
2021 free_ber2:;
2022                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
2023                 ber_free_buf( ber );
2024
2025                 if ( rs->sr_err != LDAP_SUCCESS ) {
2026                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2027                         ctrls = NULL;
2028                         goto done;
2029                 }
2030
2031                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
2032         }
2033
2034         if ( op->o_ctrls ) {
2035                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
2036                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
2037                 }
2038         }
2039         ctrls[ i + 1 ] = NULL;
2040
2041 done:;
2042         if ( ctrls == NULL ) {
2043                 ctrls = op->o_ctrls;
2044         }
2045
2046         *pctrls = ctrls;
2047
2048         return rs->sr_err;
2049 }
2050
2051 int
2052 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
2053 {
2054         LDAPControl     **ctrls = *pctrls;
2055
2056         /* we assume that the first control is the proxyAuthz
2057          * added by back-ldap, so it's the only one we explicitly
2058          * free */
2059         if ( ctrls && ctrls != op->o_ctrls ) {
2060                 assert( ctrls[ 0 ] != NULL );
2061
2062                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
2063                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2064                 }
2065
2066                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
2067         }
2068
2069         *pctrls = NULL;
2070
2071         return 0;
2072 }