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 ( tmplc->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         time_t          lc_time = (time_t)(-1);
 509
 510         assert( lcp != NULL );
 511
 512         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 513         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 514         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 515         if ( rs->sr_err != LDAP_SUCCESS ) {
 516                 goto error_return;
 517         }
 518
 519         if ( li->li_urllist_f ) {
 520                 ldap_set_urllist_proc( ld, li->li_urllist_f, li->li_urllist_p );
 521         }
 522
 523         /* Set LDAP version. This will always succeed: If the client
 524          * bound with a particular version, then so can we.
 525          */
 526         if ( li->li_version != 0 ) {
 527                 version = li->li_version;
 528
 529         } else if ( op->o_protocol != 0 ) {
 530                 version = op->o_protocol;
 531
 532         } else {
 533                 /* assume it's an internal op; set to LDAPv3 */
 534                 version = LDAP_VERSION3;
 535         }
 536         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&version );
 537
 538         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 539         ldap_set_option( ld, LDAP_OPT_REFERRALS,
 540                 LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 541
 542         if ( li->li_network_timeout > 0 ) {
 543                 struct timeval          tv;
 544
 545                 tv.tv_sec = li->li_network_timeout;
 546                 tv.tv_usec = 0;
 547                 ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
 548         }
 549
 550 #ifdef HAVE_TLS
 551         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 552         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 553                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 554         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 555         if ( rs->sr_err != LDAP_SUCCESS ) {
 556                 ldap_unbind_ext( ld, NULL, NULL );
 557                 goto error_return;
 558
 559         } else if ( li->li_idle_timeout ) {
 560                 /* only touch when activity actually took place... */
 561                 lc_time = op->o_time;
 562         }
 563 #endif /* HAVE_TLS */
 564
 565         if ( *lcp == NULL ) {
 566                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 567                 (*lcp)->lc_flags = li->li_flags;
 568         }
 569         (*lcp)->lc_ld = ld;
 570         (*lcp)->lc_refcnt = 1;
 571         (*lcp)->lc_binding = 1;
 572 #ifdef HAVE_TLS
 573         if ( is_tls ) {
 574                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 575         } else {
 576                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 577         }
 578         if ( lc_time != (time_t)(-1) ) {
 579                 (*lcp)->lc_time = lc_time;
 580         }
 581 #endif /* HAVE_TLS */
 582
 583 error_return:;
 584         if ( rs->sr_err != LDAP_SUCCESS ) {
 585                 rs->sr_err = slap_map_api2result( rs );
 586                 if ( sendok & LDAP_BACK_SENDERR ) {
 587                         if ( rs->sr_text == NULL ) {
 588                                 rs->sr_text = "ldap_initialize() failed";
 589                         }
 590                         send_ldap_result( op, rs );
 591                         rs->sr_text = NULL;
 592                 }
 593
 594         } else {
 595                 if ( li->li_conn_ttl > 0 ) {
 596                         (*lcp)->lc_create_time = op->o_time;
 597                 }
 598         }
 599
 600         return rs->sr_err;
 601 }
 602
 603 ldapconn_t *
 604 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 605 {
 606         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 607         ldapconn_t      *lc = NULL,
 608                         lc_curr = { 0 };
 609         int             refcnt = 1, binding = 1;
 610
 611         /* if the server is quarantined, and
 612          * - the current interval did not expire yet, or
 613          * - no more retries should occur,
 614          * don't return the connection */
 615         if ( li->li_isquarantined ) {
 616                 slap_retry_info_t       *ri = &li->li_quarantine;
 617                 int                     dont_retry = 1;
 618
 619                 ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
 620                 if ( li->li_isquarantined == LDAP_BACK_FQ_YES ) {
 621                         dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
 622                                 || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
 623                         if ( !dont_retry ) {
 624                                 Debug( LDAP_DEBUG_ANY,
 625                                         "%s: ldap_back_getconn quarantine "
 626                                         "retry block #%d try #%d.\n",
 627                                         op->o_log_prefix, ri->ri_idx, ri->ri_count );
 628                                 li->li_isquarantined = LDAP_BACK_FQ_RETRYING;
 629                         }
 630                 }
 631                 ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
 632
 633                 if ( dont_retry ) {
 634                         rs->sr_err = LDAP_UNAVAILABLE;
 635                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 636                                 send_ldap_result( op, rs );
 637                         }
 638                         return NULL;
 639                 }
 640         }
 641
 642         /* Internal searches are privileged and shared. So is root. */
 643         if ( op->o_do_not_cache || be_isroot( op ) ) {
 644                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 645                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 646                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 647
 648         } else {
 649                 lc_curr.lc_local_ndn = op->o_ndn;
 650                 /* Explicit binds must not be shared */
 651                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 652                         lc_curr.lc_conn = op->o_conn;
 653
 654                 } else {
 655                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 656                 }
 657         }
 658
 659         /* Explicit Bind requests always get their own conn */
 660         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 661                 /* Searches for a ldapconn in the avl tree */
 662 retry_lock:
 663                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 664
 665                 lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 666                                 (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 667                 if ( lc != NULL ) {
 668                         /* Don't reuse connections while they're still binding */
 669                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 670                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 671                                 ldap_pvt_thread_yield();
 672                                 goto retry_lock;
 673                         }
 674
 675                         refcnt = ++lc->lc_refcnt;
 676                         binding = ++lc->lc_binding;
 677                 }
 678                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 679         }
 680
 681         /* Looks like we didn't get a bind. Open a new session... */
 682         if ( lc == NULL ) {
 683                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 684                         return NULL;
 685                 }
 686                 if ( sendok & LDAP_BACK_BINDING ) {
 687                         LDAP_BACK_CONN_BINDING_SET( lc );
 688                 }
 689                 lc->lc_conn = lc_curr.lc_conn;
 690                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 691
 692                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 693                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 694                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 695                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 696
 697                 } else {
 698                         BER_BVZERO( &lc->lc_cred );
 699                         BER_BVZERO( &lc->lc_bound_ndn );
 700                         if ( !BER_BVISEMPTY( &op->o_ndn )
 701                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 702                         {
 703                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 704                         }
 705                 }
 706
 707 #ifdef HAVE_TLS
 708                 /* if start TLS failed but it was not mandatory,
 709                  * check if the non-TLS connection was already
 710                  * in cache; in case, destroy the newly created
 711                  * connection and use the existing one */
 712                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 713                                 && !ldap_tls_inplace( lc->lc_ld ) )
 714                 {
 715                         ldapconn_t *tmplc;
 716
 717                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 718                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 719                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 720                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 721                         if ( tmplc != NULL ) {
 722                                 refcnt = ++tmplc->lc_refcnt;
 723                                 binding = ++tmplc->lc_binding;
 724                                 ldap_back_conn_free( lc );
 725                                 lc = tmplc;
 726                         }
 727                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 728
 729                         if ( tmplc != NULL ) {
 730                                 goto done;
 731                         }
 732                 }
 733 #endif /* HAVE_TLS */
 734
 735                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 736
 737                 /* Inserts the newly created ldapconn in the avl tree */
 738                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 739
 740                 assert( lc->lc_refcnt == 1 );
 741                 assert( lc->lc_binding == 1 );
 742                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 743                         ldap_back_conndn_cmp, ldap_back_conndn_dup );
 744
 745 #if PRINT_CONNTREE > 0
 746                 myprint( li->li_conninfo.lai_tree, "ldap_back_getconn" );
 747 #endif /* PRINT_CONNTREE */
 748
 749                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 750
 751                 Debug( LDAP_DEBUG_TRACE,
 752                         "=>ldap_back_getconn: conn %p inserted refcnt=%u binding=%u\n",
 753                         (void *)lc, refcnt, binding );
 754
 755                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 756                 switch ( rs->sr_err ) {
 757                 case 0:
 758                         break;
 759
 760                 case -1:
 761                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 762                                 /* duplicate: free and try to get the newly created one */
 763                                 goto retry_lock;
 764                         }
 765                         /* taint connection, so that it'll be freed when released */
 766                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 767                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 768                                         ldap_back_conndnlc_cmp );
 769                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 770                         LDAP_BACK_CONN_TAINTED_SET( lc );
 771                         break;
 772
 773                 default:
 774                         ldap_back_conn_free( lc );
 775                         rs->sr_err = LDAP_OTHER;
 776                         rs->sr_text = "proxy bind collision";
 777                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 778                                 send_ldap_result( op, rs );
 779                                 rs->sr_text = NULL;
 780                         }
 781                         return NULL;
 782                 }
 783
 784         } else {
 785                 int     expiring = 0;
 786
 787                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
 788                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
 789                 {
 790                         expiring = 1;
 791
 792                         /* let it be used, but taint/delete it so that
 793                          * no-one else can look it up any further */
 794                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 795                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 796                                         ldap_back_conndnlc_cmp );
 797                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 798                         LDAP_BACK_CONN_TAINTED_SET( lc );
 799                 }
 800
 801                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 802                         char    buf[ SLAP_TEXT_BUFLEN ];
 803
 804                         snprintf( buf, sizeof( buf ),
 805                                 "conn %p fetched refcnt=%u binding=%u%s",
 806                                 (void *)lc, refcnt, binding, expiring ? " expiring" : "" );
 807                         Debug( LDAP_DEBUG_TRACE,
 808                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
 809                 }
 810         }
 811
 812 #ifdef HAVE_TLS
 813 done:;
 814 #endif /* HAVE_TLS */
 815
 816         return lc;
 817 }
 818
 819 void
 820 ldap_back_release_conn_lock(
 821         Operation               *op,
 822         SlapReply               *rs,
 823         ldapconn_t              *lc,
 824         int                     dolock )
 825 {
 826         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 827
 828         if ( dolock ) {
 829                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 830         }
 831         assert( lc->lc_refcnt > 0 );
 832         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 833         lc->lc_refcnt--;
 834         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
 835                 ldap_back_freeconn( op, lc, 0 );
 836         }
 837         if ( dolock ) {
 838                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 839         }
 840 }
 841
 842 void
 843 ldap_back_quarantine(
 844         Operation       *op,
 845         SlapReply       *rs )
 846 {
 847         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 848
 849         slap_retry_info_t       *ri = &li->li_quarantine;
 850
 851         ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
 852
 853         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
 854                 time_t          new_last = slap_get_time();
 855
 856                 switch ( li->li_isquarantined ) {
 857                 case LDAP_BACK_FQ_NO:
 858                         if ( ri->ri_last == new_last ) {
 859                                 goto done;
 860                         }
 861
 862                         Debug( LDAP_DEBUG_ANY,
 863                                 "%s: ldap_back_quarantine enter.\n",
 864                                 op->o_log_prefix, 0, 0 );
 865
 866                         ri->ri_idx = 0;
 867                         ri->ri_count = 0;
 868                         break;
 869
 870                 case LDAP_BACK_FQ_RETRYING:
 871                         Debug( LDAP_DEBUG_ANY,
 872                                 "%s: ldap_back_quarantine block #%d try #%d failed.\n",
 873                                 op->o_log_prefix, ri->ri_idx, ri->ri_count );
 874
 875                         ++ri->ri_count;
 876                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
 877                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
 878                         {
 879                                 ri->ri_count = 0;
 880                                 ++ri->ri_idx;
 881                         }
 882                         break;
 883
 884                 default:
 885                         break;
 886                 }
 887
 888                 li->li_isquarantined = LDAP_BACK_FQ_YES;
 889                 ri->ri_last = new_last;
 890
 891         } else if ( li->li_isquarantined != LDAP_BACK_FQ_NO ) {
 892                 Debug( LDAP_DEBUG_ANY,
 893                         "%s: ldap_back_quarantine exit.\n",
 894                         op->o_log_prefix, ri->ri_idx, ri->ri_count );
 895
 896                 if ( li->li_quarantine_f ) {
 897                         (void)li->li_quarantine_f( li, li->li_quarantine_p );
 898                 }
 899
 900                 ri->ri_count = 0;
 901                 ri->ri_idx = 0;
 902                 li->li_isquarantined = LDAP_BACK_FQ_NO;
 903         }
 904
 905 done:;
 906         ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
 907 }
 908
 909 /*
 910  * ldap_back_dobind
 911  *
 912  * Note: as the check for the value of lc->lc_bound was already here, I removed
 913  * it from all the callers, and I made the function return the flag, so
 914  * it can be used to simplify the check.
 915  *
 916  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 917  */
 918 static int
 919 ldap_back_dobind_int(
 920         ldapconn_t              *lc,
 921         Operation               *op,
 922         SlapReply               *rs,
 923         ldap_back_send_t        sendok,
 924         int                     retries,
 925         int                     dolock )
 926 {
 927         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 928
 929         int             rc,
 930                         isbound,
 931                         binding = 0;
 932         ber_int_t       msgid;
 933
 934         assert( retries >= 0 );
 935
 936 retry_lock:;
 937         if ( dolock ) {
 938                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 939         }
 940
 941         if ( binding == 0 ) {
 942                 /* check if already bound */
 943                 rc = isbound = LDAP_BACK_CONN_ISBOUND( lc );
 944                 if ( isbound ) {
 945                         lc->lc_binding--;
 946                         if ( dolock ) {
 947                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 948                         }
 949                         return rc;
 950                 }
 951
 952                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 953                         /* if someone else is about to bind it, give up and retry */
 954                         if ( dolock ) {
 955                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 956                         }
 957                         ldap_pvt_thread_yield();
 958                         goto retry_lock;
 959
 960                 } else {
 961                         /* otherwise this thread will bind it */
 962                         LDAP_BACK_CONN_BINDING_SET( lc );
 963                         binding = 1;
 964                 }
 965         }
 966
 967         /* wait for pending operations to finish */
 968         /* FIXME: may become a bottleneck! */
 969         if ( lc->lc_refcnt != lc->lc_binding ) {
 970                 if ( dolock ) {
 971                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 972                 }
 973                 ldap_pvt_thread_yield();
 974                 goto retry_lock;
 975         }
 976
 977         if ( dolock ) {
 978                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 979         }
 980
 981         /*
 982          * FIXME: we need to let clients use proxyAuthz
 983          * otherwise we cannot do symmetric pools of servers;
 984          * we have to live with the fact that a user can
 985          * authorize itself as any ID that is allowed
 986          * by the authzTo directive of the "proxyauthzdn".
 987          */
 988         /*
 989          * NOTE: current Proxy Authorization specification
 990          * and implementation do not allow proxy authorization
 991          * control to be provided with Bind requests
 992          */
 993         /*
 994          * if no bind took place yet, but the connection is bound
 995          * and the "idassert-authcDN" (or other ID) is set,
 996          * then bind as the asserting identity and explicitly
 997          * add the proxyAuthz control to every operation with the
 998          * dn bound to the connection as control value.
 999          * This is done also if this is the authrizing backend,
1000          * but the "override" flag is given to idassert.
1001          * It allows to use SASL bind and yet proxyAuthz users
1002          */
1003         if ( op->o_conn != NULL && !op->o_do_not_cache &&
1004                 ( !LDAP_BACK_CONN_ISPRIV( lc ) || BER_BVISEMPTY( &lc->lc_bound_ndn )) &&
1005                 ( !isbound || ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
1006         {
1007                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok );
1008                 goto done;
1009         }
1010
1011 #ifdef HAVE_CYRUS_SASL
1012         if ( LDAP_BACK_CONN_ISPRIV( lc )
1013                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
1014         {
1015                 void            *defaults = NULL;
1016
1017                 if ( li->li_acl_secprops != NULL ) {
1018                         rc = ldap_set_option( lc->lc_ld,
1019                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops );
1020
1021                         if ( rc != LDAP_OPT_SUCCESS ) {
1022                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
1023                                         "(SECPROPS,\"%s\") failed!\n",
1024                                         li->li_acl_secprops, 0, 0 );
1025                                 goto done;
1026                         }
1027                 }
1028
1029                 defaults = lutil_sasl_defaults( lc->lc_ld,
1030                                 li->li_acl_sasl_mech.bv_val,
1031                                 li->li_acl_sasl_realm.bv_val,
1032                                 li->li_acl_authcID.bv_val,
1033                                 li->li_acl_passwd.bv_val,
1034                                 NULL );
1035
1036                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
1037                                 li->li_acl_authcDN.bv_val,
1038                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
1039                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1040                                 defaults );
1041
1042                 lutil_sasl_freedefs( defaults );
1043
1044                 rs->sr_err = slap_map_api2result( rs );
1045                 if ( rs->sr_err != LDAP_SUCCESS ) {
1046                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1047                         send_ldap_result( op, rs );
1048
1049                 } else {
1050                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1051                 }
1052
1053                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1054                         ldap_back_quarantine( op, rs );
1055                 }
1056
1057                 goto done;
1058         }
1059 #endif /* HAVE_CYRUS_SASL */
1060
1061 retry:;
1062         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1063                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1064                         LDAP_SASL_SIMPLE, &lc->lc_cred,
1065                         NULL, NULL, &msgid );
1066
1067         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
1068                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
1069                         if ( dolock ) {
1070                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1071                         }
1072
1073                         assert( lc->lc_refcnt > 0 );
1074                         if ( lc->lc_refcnt == 1 ) {
1075                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
1076                                 lc->lc_ld = NULL;
1077
1078                                 /* lc here must be the regular lc, reset and ready for init */
1079                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
1080                                 if ( rs->sr_err != LDAP_SUCCESS ) {
1081                                         lc->lc_binding--;
1082                                         lc->lc_refcnt = 0;
1083                                 }
1084                         }
1085
1086                         if ( dolock ) {
1087                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1088                         }
1089
1090                         if ( rs->sr_err == LDAP_SUCCESS ) {
1091                                 if ( retries > 0 ) {
1092                                         retries--;
1093                                 }
1094                                 goto retry;
1095                         }
1096
1097                 } else {
1098                         if ( dolock ) {
1099                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1100                         }
1101                         lc->lc_binding--;
1102                         if ( dolock ) {
1103                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1104                         }
1105                 }
1106
1107                 /* FIXME: one binding-- too many? */
1108                 lc->lc_binding--;
1109                 ldap_back_freeconn( op, lc, dolock );
1110                 rs->sr_err = slap_map_api2result( rs );
1111
1112                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1113                         ldap_back_quarantine( op, rs );
1114                 }
1115
1116                 return 0;
1117         }
1118
1119         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1120         if ( rc == LDAP_SUCCESS ) {
1121                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1122         }
1123
1124 done:;
1125         lc->lc_binding--;
1126         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1127         rc = LDAP_BACK_CONN_ISBOUND( lc );
1128         if ( !rc ) {
1129                 ldap_back_release_conn_lock( op, rs, lc, dolock );
1130         }
1131
1132         return rc;
1133 }
1134
1135 int
1136 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1137 {
1138         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1139
1140         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
1141 }
1142
1143 /*
1144  * ldap_back_default_rebind
1145  *
1146  * This is a callback used for chasing referrals using the same
1147  * credentials as the original user on this session.
1148  */
1149 int
1150 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1151         ber_int_t msgid, void *params )
1152 {
1153         ldapconn_t      *lc = (ldapconn_t *)params;
1154
1155 #ifdef HAVE_TLS
1156         /* ... otherwise we couldn't get here */
1157         assert( lc != NULL );
1158
1159         if ( !ldap_tls_inplace( ld ) ) {
1160                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1161                                 rc;
1162                 const char      *text = NULL;
1163
1164                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1165                         LDAP_BACK_RETRY_DEFAULT, &text );
1166                 if ( rc != LDAP_SUCCESS ) {
1167                         return rc;
1168                 }
1169         }
1170 #endif /* HAVE_TLS */
1171
1172         /* FIXME: add checks on the URL/identity? */
1173
1174         return ldap_sasl_bind_s( ld,
1175                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1176                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1177 }
1178
1179 /*
1180  * ldap_back_default_urllist
1181  */
1182 int
1183 ldap_back_default_urllist(
1184         LDAP            *ld,
1185         LDAPURLDesc     **urllist,
1186         LDAPURLDesc     **url,
1187         void            *params )
1188 {
1189         ldapinfo_t      *li = (ldapinfo_t *)params;
1190         LDAPURLDesc     **urltail;
1191
1192         if ( urllist == url ) {
1193                 return LDAP_SUCCESS;
1194         }
1195
1196         for ( urltail = &(*url)->lud_next; *urltail; urltail = &(*urltail)->lud_next )
1197                 /* count */ ;
1198
1199         *urltail = *urllist;
1200         *urllist = *url;
1201         *url = NULL;
1202
1203         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1204         if ( li->li_uri ) {
1205                 ch_free( li->li_uri );
1206         }
1207
1208         ldap_get_option( ld, LDAP_OPT_URI, (void *)&li->li_uri );
1209         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1210
1211         return LDAP_SUCCESS;
1212 }
1213
1214 int
1215 ldap_back_cancel(
1216                 ldapconn_t              *lc,
1217                 Operation               *op,
1218                 SlapReply               *rs,
1219                 ber_int_t               msgid,
1220                 ldap_back_send_t        sendok )
1221 {
1222         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1223
1224         /* default behavior */
1225         if ( LDAP_BACK_ABANDON( li ) ) {
1226                 return ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1227         }
1228
1229         if ( LDAP_BACK_IGNORE( li ) ) {
1230                 return LDAP_SUCCESS;
1231         }
1232
1233         if ( LDAP_BACK_CANCEL( li ) ) {
1234                 /* FIXME: asynchronous? */
1235                 return ldap_cancel_s( lc->lc_ld, msgid, NULL, NULL );
1236         }
1237
1238         assert( 0 );
1239
1240         return LDAP_OTHER;
1241 }
1242
1243 int
1244 ldap_back_op_result(
1245                 ldapconn_t              *lc,
1246                 Operation               *op,
1247                 SlapReply               *rs,
1248                 ber_int_t               msgid,
1249                 time_t                  timeout,
1250                 ldap_back_send_t        sendok )
1251 {
1252         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1253
1254         char            *match = NULL;
1255         char            *text = NULL;
1256         char            **refs = NULL;
1257         LDAPControl     **ctrls = NULL;
1258
1259 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1260
1261         rs->sr_text = NULL;
1262         rs->sr_matched = NULL;
1263         rs->sr_ref = NULL;
1264         rs->sr_ctrls = NULL;
1265
1266         /* if the error recorded in the reply corresponds
1267          * to a successful state, get the error from the
1268          * remote server response */
1269         if ( ERR_OK( rs->sr_err ) ) {
1270                 int             rc;
1271                 struct timeval  tv;
1272                 LDAPMessage     *res = NULL;
1273
1274                 if ( timeout ) {
1275                         tv.tv_sec = timeout;
1276                         tv.tv_usec = 0;
1277
1278                 } else {
1279                         LDAP_BACK_TV_SET( &tv );
1280                 }
1281
1282 retry:;
1283                 /* if result parsing fails, note the failure reason */
1284                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1285                 switch ( rc ) {
1286                 case 0:
1287                         if ( timeout ) {
1288                                 (void)ldap_back_cancel( lc, op, rs, msgid, sendok );
1289                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
1290                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OTHER;
1291                                 rs->sr_text = "Operation timed out";
1292                                 break;
1293                         }
1294
1295                         LDAP_BACK_TV_SET( &tv );
1296                         ldap_pvt_thread_yield();
1297                         goto retry;
1298
1299                 case -1:
1300                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1301                                         &rs->sr_err );
1302                         break;
1303
1304
1305                 /* otherwise get the result; if it is not
1306                  * LDAP_SUCCESS, record it in the reply
1307                  * structure (this includes
1308                  * LDAP_COMPARE_{TRUE|FALSE}) */
1309                 default:
1310                         /* only touch when activity actually took place... */
1311                         if ( li->li_idle_timeout && lc ) {
1312                                 lc->lc_time = op->o_time;
1313                         }
1314
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
1355         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1356                 if ( !( sendok & LDAP_BACK_RETRYING ) ) {
1357                         if ( LDAP_BACK_QUARANTINE( li ) ) {
1358                                 ldap_back_quarantine( op, rs );
1359                         }
1360                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
1361                                 send_ldap_result( op, rs );
1362                         }
1363                 }
1364
1365         } else if ( op->o_conn &&
1366                 ( ( ( sendok & LDAP_BACK_SENDOK ) && ERR_OK( rs->sr_err ) )
1367                         || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1368         {
1369                 send_ldap_result( op, rs );
1370         }
1371
1372         if ( match ) {
1373                 if ( rs->sr_matched != match ) {
1374                         free( (char *)rs->sr_matched );
1375                 }
1376                 rs->sr_matched = NULL;
1377                 ldap_memfree( match );
1378         }
1379
1380         if ( text ) {
1381                 ldap_memfree( text );
1382         }
1383         rs->sr_text = NULL;
1384
1385         if ( rs->sr_ref ) {
1386                 assert( refs != NULL );
1387                 ber_memvfree( (void **)refs );
1388                 op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
1389                 rs->sr_ref = NULL;
1390         }
1391
1392         if ( ctrls ) {
1393                 assert( rs->sr_ctrls != NULL );
1394                 ldap_controls_free( ctrls );
1395                 rs->sr_ctrls = NULL;
1396         }
1397
1398         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1399 }
1400
1401 /* return true if bound, false if failed */
1402 int
1403 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1404 {
1405         int             rc = 0;
1406         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1407
1408         assert( lcp != NULL );
1409         assert( *lcp != NULL );
1410
1411         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1412
1413         if ( (*lcp)->lc_refcnt == 1 ) {
1414                 ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1415                 Debug( LDAP_DEBUG_ANY,
1416                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1417                         op->o_log_prefix, li->li_uri,
1418                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1419                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1420                 ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1421
1422                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1423                 (*lcp)->lc_ld = NULL;
1424                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1425
1426                 /* lc here must be the regular lc, reset and ready for init */
1427                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1428                 if ( rc != LDAP_SUCCESS ) {
1429                         rc = 0;
1430                         /* freeit, because lc_refcnt == 1 */
1431                         (*lcp)->lc_refcnt = 0;
1432                         (void)ldap_back_freeconn( op, *lcp, 0 );
1433                         *lcp = NULL;
1434
1435                 } else {
1436                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1437                         if ( rc == 0 && *lcp != NULL ) {
1438                                 /* freeit, because lc_refcnt == 1 */
1439                                 (*lcp)->lc_refcnt = 0;
1440                                 LDAP_BACK_CONN_TAINTED_SET( *lcp );
1441                                 (void)ldap_back_freeconn( op, *lcp, 0 );
1442                                 *lcp = NULL;
1443                         }
1444                 }
1445
1446         } else {
1447                 Debug( LDAP_DEBUG_TRACE,
1448                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1449                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1450
1451                 LDAP_BACK_CONN_TAINTED_SET( *lcp );
1452                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1453                 *lcp = NULL;
1454
1455                 if ( sendok ) {
1456                         rs->sr_err = LDAP_UNAVAILABLE;
1457                         rs->sr_text = "unable to retry";
1458                         send_ldap_result( op, rs );
1459                 }
1460         }
1461
1462         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1463
1464         return rc;
1465 }
1466
1467 static int
1468 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1469 {
1470         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1471         struct berval   binddn = slap_empty_bv;
1472         struct berval   bindcred = slap_empty_bv;
1473         struct berval   ndn;
1474         int             dobind = 0;
1475         int             msgid;
1476         int             rc;
1477
1478         /* don't proxyAuthz if protocol is not LDAPv3 */
1479         switch ( li->li_version ) {
1480         case LDAP_VERSION3:
1481                 break;
1482
1483         case 0:
1484                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1485                         break;
1486                 }
1487                 /* fall thru */
1488
1489         default:
1490                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1491                 if ( sendok & LDAP_BACK_SENDERR ) {
1492                         send_ldap_result( op, rs );
1493                 }
1494                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1495                 goto done;
1496         }
1497
1498         if ( op->o_tag == LDAP_REQ_BIND ) {
1499                 ndn = op->o_req_ndn;
1500
1501         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1502                 ndn = op->o_conn->c_ndn;
1503
1504         } else {
1505                 ndn = op->o_ndn;
1506         }
1507
1508         /*
1509          * FIXME: we need to let clients use proxyAuthz
1510          * otherwise we cannot do symmetric pools of servers;
1511          * we have to live with the fact that a user can
1512          * authorize itself as any ID that is allowed
1513          * by the authzTo directive of the "proxyauthzdn".
1514          */
1515         /*
1516          * NOTE: current Proxy Authorization specification
1517          * and implementation do not allow proxy authorization
1518          * control to be provided with Bind requests
1519          */
1520         /*
1521          * if no bind took place yet, but the connection is bound
1522          * and the "proxyauthzdn" is set, then bind as
1523          * "proxyauthzdn" and explicitly add the proxyAuthz
1524          * control to every operation with the dn bound
1525          * to the connection as control value.
1526          */
1527
1528         /* bind as proxyauthzdn only if no idassert mode
1529          * is requested, or if the client's identity
1530          * is authorized */
1531         switch ( li->li_idassert_mode ) {
1532         case LDAP_BACK_IDASSERT_LEGACY:
1533                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1534                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1535                         {
1536                                 binddn = li->li_idassert_authcDN;
1537                                 bindcred = li->li_idassert_passwd;
1538                                 dobind = 1;
1539                         }
1540                 }
1541                 break;
1542
1543         default:
1544                 /* NOTE: rootdn can always idassert */
1545                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1546                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1547                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1548                                 if ( sendok & LDAP_BACK_SENDERR ) {
1549                                         send_ldap_result( op, rs );
1550                                 }
1551                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1552
1553                         } else {
1554                                 rs->sr_err = LDAP_SUCCESS;
1555                                 binddn = slap_empty_bv;
1556                                 bindcred = slap_empty_bv;
1557                                 break;
1558                         }
1559
1560                         goto done;
1561
1562                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1563                         struct berval authcDN;
1564
1565                         if ( BER_BVISNULL( &ndn ) ) {
1566                                 authcDN = slap_empty_bv;
1567
1568                         } else {
1569                                 authcDN = ndn;
1570                         }
1571                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1572                                         &authcDN, &authcDN );
1573                         if ( rs->sr_err != LDAP_SUCCESS ) {
1574                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1575                                         if ( sendok & LDAP_BACK_SENDERR ) {
1576                                                 send_ldap_result( op, rs );
1577                                         }
1578                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1579
1580                                 } else {
1581                                         rs->sr_err = LDAP_SUCCESS;
1582                                         binddn = slap_empty_bv;
1583                                         bindcred = slap_empty_bv;
1584                                         break;
1585                                 }
1586
1587                                 goto done;
1588                         }
1589                 }
1590
1591                 binddn = li->li_idassert_authcDN;
1592                 bindcred = li->li_idassert_passwd;
1593                 dobind = 1;
1594                 break;
1595         }
1596
1597         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1598 #ifdef HAVE_CYRUS_SASL
1599                 void            *defaults = NULL;
1600                 struct berval   authzID = BER_BVNULL;
1601                 int             freeauthz = 0;
1602
1603                 /* if SASL supports native authz, prepare for it */
1604                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1605                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1606                 {
1607                         switch ( li->li_idassert_mode ) {
1608                         case LDAP_BACK_IDASSERT_OTHERID:
1609                         case LDAP_BACK_IDASSERT_OTHERDN:
1610                                 authzID = li->li_idassert_authzID;
1611                                 break;
1612
1613                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1614                                 BER_BVSTR( &authzID, "dn:" );
1615                                 break;
1616
1617                         case LDAP_BACK_IDASSERT_SELF:
1618                                 if ( BER_BVISNULL( &ndn ) ) {
1619                                         /* connection is not authc'd, so don't idassert */
1620                                         BER_BVSTR( &authzID, "dn:" );
1621                                         break;
1622                                 }
1623                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1624                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1625                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1626                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1627                                                 ndn.bv_val, ndn.bv_len + 1 );
1628                                 freeauthz = 1;
1629                                 break;
1630
1631                         default:
1632                                 break;
1633                         }
1634                 }
1635
1636                 if ( li->li_idassert_secprops != NULL ) {
1637                         rs->sr_err = ldap_set_option( lc->lc_ld,
1638                                 LDAP_OPT_X_SASL_SECPROPS,
1639                                 (void *)li->li_idassert_secprops );
1640
1641                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1642                                 rs->sr_err = LDAP_OTHER;
1643                                 if ( sendok & LDAP_BACK_SENDERR ) {
1644                                         send_ldap_result( op, rs );
1645                                 }
1646                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1647                                 goto done;
1648                         }
1649                 }
1650
1651                 defaults = lutil_sasl_defaults( lc->lc_ld,
1652                                 li->li_idassert_sasl_mech.bv_val,
1653                                 li->li_idassert_sasl_realm.bv_val,
1654                                 li->li_idassert_authcID.bv_val,
1655                                 li->li_idassert_passwd.bv_val,
1656                                 authzID.bv_val );
1657
1658                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1659                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1660                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1661                                 defaults );
1662
1663                 rs->sr_err = slap_map_api2result( rs );
1664                 if ( rs->sr_err != LDAP_SUCCESS ) {
1665                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1666                         if ( sendok & LDAP_BACK_SENDERR ) {
1667                                 send_ldap_result( op, rs );
1668                         }
1669
1670                 } else {
1671                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1672                 }
1673
1674                 lutil_sasl_freedefs( defaults );
1675                 if ( freeauthz ) {
1676                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1677                 }
1678
1679                 goto done;
1680 #endif /* HAVE_CYRUS_SASL */
1681         }
1682
1683         switch ( li->li_idassert_authmethod ) {
1684         case LDAP_AUTH_NONE:
1685                 BER_BVSTR( &binddn, "" );
1686                 BER_BVSTR( &bindcred, "" );
1687                 /* fallthru */
1688
1689         case LDAP_AUTH_SIMPLE:
1690                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1691                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1692                                 &bindcred, NULL, NULL, &msgid );
1693                 rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1694                 break;
1695
1696         default:
1697                 /* unsupported! */
1698                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1699                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1700                 if ( sendok & LDAP_BACK_SENDERR ) {
1701                         send_ldap_result( op, rs );
1702                 }
1703                 goto done;
1704         }
1705
1706         if ( rc == LDAP_SUCCESS ) {
1707                 /* set rebind stuff in case of successful proxyAuthz bind,
1708                  * so that referral chasing is attempted using the right
1709                  * identity */
1710                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1711                 ber_bvreplace( &lc->lc_bound_ndn, &binddn );
1712
1713                 if ( LDAP_BACK_SAVECRED( li ) ) {
1714                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
1715                                 memset( lc->lc_cred.bv_val, 0,
1716                                                 lc->lc_cred.bv_len );
1717                         }
1718                         ber_bvreplace( &lc->lc_cred, &bindcred );
1719                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
1720                 }
1721         }
1722 done:;
1723         return LDAP_BACK_CONN_ISBOUND( lc );
1724 }
1725
1726 /*
1727  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1728  * to existing server-side controls if required; if not,
1729  * the existing server-side controls are placed in *pctrls.
1730  * The caller, after using the controls in client API
1731  * operations, if ( *pctrls != op->o_ctrls ), should
1732  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1733  * The function returns success if the control could
1734  * be added if required, or if it did nothing; in the future,
1735  * it might return some error if it failed.
1736  *
1737  * if no bind took place yet, but the connection is bound
1738  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1739  * and explicitly add proxyAuthz the control to every operation
1740  * with the dn bound to the connection as control value.
1741  *
1742  * If no server-side controls are defined for the operation,
1743  * simply add the proxyAuthz control; otherwise, if the
1744  * proxyAuthz control is not already set, add it as
1745  * the first one
1746  *
1747  * FIXME: is controls order significant for security?
1748  * ANSWER: controls ordering and interoperability
1749  * must be indicated by the specs of each control; if none
1750  * is specified, the order is irrelevant.
1751  */
1752 int
1753 ldap_back_proxy_authz_ctrl(
1754                 struct berval   *bound_ndn,
1755                 int             version,
1756                 slap_idassert_t *si,
1757                 Operation       *op,
1758                 SlapReply       *rs,
1759                 LDAPControl     ***pctrls )
1760 {
1761         LDAPControl             **ctrls = NULL;
1762         int                     i = 0;
1763         slap_idassert_mode_t    mode;
1764         struct berval           assertedID,
1765                                 ndn;
1766
1767         *pctrls = NULL;
1768
1769         rs->sr_err = LDAP_SUCCESS;
1770
1771         /* don't proxyAuthz if protocol is not LDAPv3 */
1772         switch ( version ) {
1773         case LDAP_VERSION3:
1774                 break;
1775
1776         case 0:
1777                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1778                         break;
1779                 }
1780                 /* fall thru */
1781
1782         default:
1783                 goto done;
1784         }
1785
1786         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1787          * but if it is not set this test fails.  We need a different
1788          * means to detect if idassert is enabled */
1789         if ( ( BER_BVISNULL( &si->si_bc.sb_authcId ) || BER_BVISEMPTY( &si->si_bc.sb_authcId ) )
1790                         && ( BER_BVISNULL( &si->si_bc.sb_binddn ) || BER_BVISEMPTY( &si->si_bc.sb_binddn ) ) )
1791         {
1792                 goto done;
1793         }
1794
1795         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1796                 goto done;
1797         }
1798
1799         if ( op->o_tag == LDAP_REQ_BIND ) {
1800                 ndn = op->o_req_ndn;
1801
1802         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1803                 ndn = op->o_conn->c_ndn;
1804
1805         } else {
1806                 ndn = op->o_ndn;
1807         }
1808
1809         if ( si->si_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1810                 if ( op->o_proxy_authz ) {
1811                         /*
1812                          * FIXME: we do not want to perform proxyAuthz
1813                          * on behalf of the client, because this would
1814                          * be performed with "proxyauthzdn" privileges.
1815                          *
1816                          * This might actually be too strict, since
1817                          * the "proxyauthzdn" authzTo, and each entry's
1818                          * authzFrom attributes may be crafted
1819                          * to avoid unwanted proxyAuthz to take place.
1820                          */
1821 #if 0
1822                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1823                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1824 #endif
1825                         goto done;
1826                 }
1827
1828                 if ( !BER_BVISNULL( bound_ndn ) ) {
1829                         goto done;
1830                 }
1831
1832                 if ( BER_BVISNULL( &ndn ) ) {
1833                         goto done;
1834                 }
1835
1836                 if ( BER_BVISNULL( &si->si_bc.sb_binddn ) ) {
1837                         goto done;
1838                 }
1839
1840         } else if ( si->si_bc.sb_method == LDAP_AUTH_SASL ) {
1841                 if ( ( si->si_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1842                 {
1843                         /* already asserted in SASL via native authz */
1844                         goto done;
1845                 }
1846
1847         } else if ( si->si_authz && !be_isroot( op ) ) {
1848                 int             rc;
1849                 struct berval authcDN;
1850
1851                 if ( BER_BVISNULL( &ndn ) ) {
1852                         authcDN = slap_empty_bv;
1853                 } else {
1854                         authcDN = ndn;
1855                 }
1856                 rc = slap_sasl_matches( op, si->si_authz,
1857                                 &authcDN, & authcDN );
1858                 if ( rc != LDAP_SUCCESS ) {
1859                         if ( si->si_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1860                                 /* ndn is not authorized
1861                                  * to use idassert */
1862                                 rs->sr_err = rc;
1863                         }
1864                         goto done;
1865                 }
1866         }
1867
1868         if ( op->o_proxy_authz ) {
1869                 /*
1870                  * FIXME: we can:
1871                  * 1) ignore the already set proxyAuthz control
1872                  * 2) leave it in place, and don't set ours
1873                  * 3) add both
1874                  * 4) reject the operation
1875                  *
1876                  * option (4) is very drastic
1877                  * option (3) will make the remote server reject
1878                  * the operation, thus being equivalent to (4)
1879                  * option (2) will likely break the idassert
1880                  * assumptions, so we cannot accept it;
1881                  * option (1) means that we are contradicting
1882                  * the client's reques.
1883                  *
1884                  * I think (4) is the only correct choice.
1885                  */
1886                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1887                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1888         }
1889
1890         if ( op->o_is_auth_check ) {
1891                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1892
1893         } else {
1894                 mode = si->si_mode;
1895         }
1896
1897         switch ( mode ) {
1898         case LDAP_BACK_IDASSERT_SELF:
1899                 if ( BER_BVISNULL( &ndn ) ) {
1900                         goto done;
1901                 }
1902                 assertedID = ndn;
1903                 break;
1904
1905         case LDAP_BACK_IDASSERT_LEGACY:
1906                 /* original behavior:
1907                  * assert the client's identity */
1908                 if ( BER_BVISNULL( &ndn ) ) {
1909                         assertedID = slap_empty_bv;
1910                 } else {
1911                         assertedID = ndn;
1912                 }
1913                 break;
1914
1915         case LDAP_BACK_IDASSERT_ANONYMOUS:
1916                 /* assert "anonymous" */
1917                 assertedID = slap_empty_bv;
1918                 break;
1919
1920         case LDAP_BACK_IDASSERT_NOASSERT:
1921                 /* don't assert; bind as proxyauthzdn */
1922                 goto done;
1923
1924         case LDAP_BACK_IDASSERT_OTHERID:
1925         case LDAP_BACK_IDASSERT_OTHERDN:
1926                 /* assert idassert DN */
1927                 assertedID = si->si_bc.sb_authzId;
1928                 break;
1929
1930         default:
1931                 assert( 0 );
1932         }
1933
1934         if ( BER_BVISNULL( &assertedID ) ) {
1935                 assertedID = slap_empty_bv;
1936         }
1937
1938         /* don't idassert the bound DN (ITS#4497) */
1939         if ( dn_match( &assertedID, bound_ndn ) ) {
1940                 goto done;
1941         }
1942
1943         if ( op->o_ctrls ) {
1944                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1945                         /* just count ctrls */ ;
1946         }
1947
1948         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1949                         op->o_tmpmemctx );
1950         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1951
1952         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1953         ctrls[ 0 ]->ldctl_iscritical = 1;
1954
1955         switch ( si->si_mode ) {
1956         /* already in u:ID or dn:DN form */
1957         case LDAP_BACK_IDASSERT_OTHERID:
1958         case LDAP_BACK_IDASSERT_OTHERDN:
1959                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1960                 break;
1961
1962         /* needs the dn: prefix */
1963         default:
1964                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1965                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1966                                 op->o_tmpmemctx );
1967                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1968                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1969                                 assertedID.bv_val, assertedID.bv_len + 1 );
1970                 break;
1971         }
1972
1973         /* Older versions of <draft-weltman-ldapv3-proxy> required
1974          * to encode the value of the authzID (and called it proxyDN);
1975          * this hack provides compatibility with those DSAs that
1976          * implement it this way */
1977         if ( si->si_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
1978                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
1979                 BerElementBuffer        berbuf;
1980                 BerElement              *ber = (BerElement *)&berbuf;
1981                 ber_tag_t               tag;
1982
1983                 ber_init2( ber, 0, LBER_USE_DER );
1984                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1985
1986                 tag = ber_printf( ber, "O", &authzID );
1987                 if ( tag == LBER_ERROR ) {
1988                         rs->sr_err = LDAP_OTHER;
1989                         goto free_ber;
1990                 }
1991
1992                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1993                         rs->sr_err = LDAP_OTHER;
1994                         goto free_ber;
1995                 }
1996
1997 free_ber:;
1998                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1999                 ber_free_buf( ber );
2000
2001                 if ( rs->sr_err != LDAP_SUCCESS ) {
2002                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2003                         ctrls = NULL;
2004                         goto done;
2005                 }
2006
2007         } else if ( si->si_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
2008                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
2009                                         tmp;
2010                 BerElementBuffer        berbuf;
2011                 BerElement              *ber = (BerElement *)&berbuf;
2012                 ber_tag_t               tag;
2013
2014                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
2015                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2016                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2017                         ctrls = NULL;
2018                         rs->sr_err = LDAP_PROTOCOL_ERROR;
2019                         goto done;
2020                 }
2021
2022                 tmp = authzID;
2023                 tmp.bv_val += STRLENOF( "dn:" );
2024                 tmp.bv_len -= STRLENOF( "dn:" );
2025
2026                 ber_init2( ber, 0, LBER_USE_DER );
2027                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
2028
2029                 /* apparently, Mozilla API encodes this
2030                  * as "SEQUENCE { LDAPDN }" */
2031                 tag = ber_printf( ber, "{O}", &tmp );
2032                 if ( tag == LBER_ERROR ) {
2033                         rs->sr_err = LDAP_OTHER;
2034                         goto free_ber2;
2035                 }
2036
2037                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
2038                         rs->sr_err = LDAP_OTHER;
2039                         goto free_ber2;
2040                 }
2041
2042 free_ber2:;
2043                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
2044                 ber_free_buf( ber );
2045
2046                 if ( rs->sr_err != LDAP_SUCCESS ) {
2047                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2048                         ctrls = NULL;
2049                         goto done;
2050                 }
2051
2052                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
2053         }
2054
2055         if ( op->o_ctrls ) {
2056                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
2057                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
2058                 }
2059         }
2060         ctrls[ i + 1 ] = NULL;
2061
2062 done:;
2063         if ( ctrls == NULL ) {
2064                 ctrls = op->o_ctrls;
2065         }
2066
2067         *pctrls = ctrls;
2068
2069         return rs->sr_err;
2070 }
2071
2072 int
2073 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
2074 {
2075         LDAPControl     **ctrls = *pctrls;
2076
2077         /* we assume that the first control is the proxyAuthz
2078          * added by back-ldap, so it's the only one we explicitly
2079          * free */
2080         if ( ctrls && ctrls != op->o_ctrls ) {
2081                 assert( ctrls[ 0 ] != NULL );
2082
2083                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
2084                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2085                 }
2086
2087                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
2088         }
2089
2090         *pctrls = NULL;
2091
2092         return 0;
2093 }