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                 if ( li->li_quarantine_f ) {
 889                         (void)li->li_quarantine_f( li, li->li_quarantine_p );
 890                 }
 891
 892                 ri->ri_count = 0;
 893                 ri->ri_idx = 0;
 894                 li->li_isquarantined = LDAP_BACK_FQ_NO;
 895         }
 896
 897         if ( dolock ) {
 898                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 899         }
 900 }
 901
 902 /*
 903  * ldap_back_dobind
 904  *
 905  * Note: as the check for the value of lc->lc_bound was already here, I removed
 906  * it from all the callers, and I made the function return the flag, so
 907  * it can be used to simplify the check.
 908  *
 909  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 910  */
 911 static int
 912 ldap_back_dobind_int(
 913         ldapconn_t              *lc,
 914         Operation               *op,
 915         SlapReply               *rs,
 916         ldap_back_send_t        sendok,
 917         int                     retries,
 918         int                     dolock )
 919 {
 920         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 921
 922         int             rc, binding = 0;
 923         ber_int_t       msgid;
 924
 925         assert( retries >= 0 );
 926
 927 retry_lock:;
 928         if ( dolock ) {
 929                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 930         }
 931
 932         if ( binding == 0 ) {
 933                 /* check if already bound */
 934                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 935                 if ( rc ) {
 936                         lc->lc_binding--;
 937                         if ( dolock ) {
 938                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 939                         }
 940                         return rc;
 941                 }
 942
 943                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 944                         /* if someone else is about to bind it, give up and retry */
 945                         if ( dolock ) {
 946                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 947                         }
 948                         ldap_pvt_thread_yield();
 949                         goto retry_lock;
 950
 951                 } else {
 952                         /* otherwise this thread will bind it */
 953                         LDAP_BACK_CONN_BINDING_SET( lc );
 954                         binding = 1;
 955                 }
 956         }
 957
 958         /* wait for pending operations to finish */
 959         /* FIXME: may become a bottleneck! */
 960         if ( lc->lc_refcnt != lc->lc_binding ) {
 961                 if ( dolock ) {
 962                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 963                 }
 964                 ldap_pvt_thread_yield();
 965                 goto retry_lock;
 966         }
 967
 968         if ( dolock ) {
 969                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 970         }
 971
 972 #if 0
 973         while ( lc->lc_refcnt > 1 ) {
 974                 ldap_pvt_thread_yield();
 975                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 976                 if ( rc ) {
 977                         return rc;
 978                 }
 979         }
 980
 981         if ( dolock ) {
 982                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 983         }
 984         LDAP_BACK_CONN_BINDING_SET( lc );
 985         if ( dolock ) {
 986                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 987         }
 988 #endif
 989
 990         /*
 991          * FIXME: we need to let clients use proxyAuthz
 992          * otherwise we cannot do symmetric pools of servers;
 993          * we have to live with the fact that a user can
 994          * authorize itself as any ID that is allowed
 995          * by the authzTo directive of the "proxyauthzdn".
 996          */
 997         /*
 998          * NOTE: current Proxy Authorization specification
 999          * and implementation do not allow proxy authorization
1000          * control to be provided with Bind requests
1001          */
1002         /*
1003          * if no bind took place yet, but the connection is bound
1004          * and the "idassert-authcDN" (or other ID) is set,
1005          * then bind as the asserting identity and explicitly
1006          * add the proxyAuthz control to every operation with the
1007          * dn bound to the connection as control value.
1008          * This is done also if this is the authrizing backend,
1009          * but the "override" flag is given to idassert.
1010          * It allows to use SASL bind and yet proxyAuthz users
1011          */
1012         if ( op->o_conn != NULL &&
1013                 !op->o_do_not_cache &&
1014                 ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
1015                         ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
1016         {
1017                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok );
1018                 goto done;
1019         }
1020
1021 #ifdef HAVE_CYRUS_SASL
1022         if ( LDAP_BACK_CONN_ISPRIV( lc )
1023                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
1024         {
1025                 void            *defaults = NULL;
1026
1027                 if ( li->li_acl_secprops != NULL ) {
1028                         rc = ldap_set_option( lc->lc_ld,
1029                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops );
1030
1031                         if ( rc != LDAP_OPT_SUCCESS ) {
1032                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
1033                                         "(SECPROPS,\"%s\") failed!\n",
1034                                         li->li_acl_secprops, 0, 0 );
1035                                 goto done;
1036                         }
1037                 }
1038
1039                 defaults = lutil_sasl_defaults( lc->lc_ld,
1040                                 li->li_acl_sasl_mech.bv_val,
1041                                 li->li_acl_sasl_realm.bv_val,
1042                                 li->li_acl_authcID.bv_val,
1043                                 li->li_acl_passwd.bv_val,
1044                                 NULL );
1045
1046                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
1047                                 li->li_acl_authcDN.bv_val,
1048                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
1049                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1050                                 defaults );
1051
1052                 lutil_sasl_freedefs( defaults );
1053
1054                 rs->sr_err = slap_map_api2result( rs );
1055                 if ( rs->sr_err != LDAP_SUCCESS ) {
1056                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1057                         send_ldap_result( op, rs );
1058
1059                 } else {
1060                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1061                 }
1062                 goto done;
1063         }
1064 #endif /* HAVE_CYRUS_SASL */
1065
1066 retry:;
1067         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1068                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1069                         LDAP_SASL_SIMPLE, &lc->lc_cred,
1070                         NULL, NULL, &msgid );
1071
1072         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
1073                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
1074                         if ( dolock ) {
1075                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1076                         }
1077
1078                         assert( lc->lc_refcnt > 0 );
1079                         if ( lc->lc_refcnt == 1 ) {
1080                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
1081                                 lc->lc_ld = NULL;
1082
1083                                 /* lc here must be the regular lc, reset and ready for init */
1084                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
1085                                 if ( rs->sr_err != LDAP_SUCCESS ) {
1086                                         lc->lc_binding--;
1087                                         lc->lc_refcnt = 0;
1088                                 }
1089                         }
1090
1091                         if ( dolock ) {
1092                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1093                         }
1094
1095                         if ( rs->sr_err == LDAP_SUCCESS ) {
1096                                 if ( retries > 0 ) {
1097                                         retries--;
1098                                 }
1099                                 goto retry;
1100                         }
1101
1102                 } else {
1103                         if ( dolock ) {
1104                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1105                         }
1106                         lc->lc_binding--;
1107                         if ( dolock ) {
1108                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1109                         }
1110                 }
1111
1112                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1113                         ldap_back_quarantine( op, rs, dolock );
1114                 }
1115
1116                 /* FIXME: one binding-- too many? */
1117                 lc->lc_binding--;
1118                 ldap_back_freeconn( op, lc, dolock );
1119                 rs->sr_err = slap_map_api2result( rs );
1120
1121                 return 0;
1122         }
1123
1124         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1125         if ( rc == LDAP_SUCCESS ) {
1126                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1127         }
1128
1129 done:;
1130         if ( LDAP_BACK_QUARANTINE( li ) ) {
1131                 ldap_back_quarantine( op, rs, dolock );
1132         }
1133
1134         lc->lc_binding--;
1135         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1136         rc = LDAP_BACK_CONN_ISBOUND( lc );
1137         if ( !rc ) {
1138                 ldap_back_release_conn_lock( op, rs, lc, dolock );
1139         }
1140
1141         return rc;
1142 }
1143
1144 int
1145 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1146 {
1147         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1148
1149         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
1150 }
1151
1152 /*
1153  * ldap_back_default_rebind
1154  *
1155  * This is a callback used for chasing referrals using the same
1156  * credentials as the original user on this session.
1157  */
1158 int
1159 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1160         ber_int_t msgid, void *params )
1161 {
1162         ldapconn_t      *lc = (ldapconn_t *)params;
1163
1164 #ifdef HAVE_TLS
1165         /* ... otherwise we couldn't get here */
1166         assert( lc != NULL );
1167
1168         if ( !ldap_tls_inplace( ld ) ) {
1169                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1170                                 rc;
1171                 const char      *text = NULL;
1172
1173                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1174                         LDAP_BACK_RETRY_DEFAULT, &text );
1175                 if ( rc != LDAP_SUCCESS ) {
1176                         return rc;
1177                 }
1178         }
1179 #endif /* HAVE_TLS */
1180
1181         /* FIXME: add checks on the URL/identity? */
1182
1183         return ldap_sasl_bind_s( ld,
1184                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1185                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1186 }
1187
1188 /*
1189  * ldap_back_default_urllist
1190  */
1191 int
1192 ldap_back_default_urllist(
1193         LDAP            *ld,
1194         LDAPURLDesc     **urllist,
1195         LDAPURLDesc     **url,
1196         void            *params )
1197 {
1198         ldapinfo_t      *li = (ldapinfo_t *)params;
1199         LDAPURLDesc     **urltail;
1200
1201         if ( urllist == url ) {
1202                 return LDAP_SUCCESS;
1203         }
1204
1205         for ( urltail = &(*url)->lud_next; *urltail; urltail = &(*urltail)->lud_next )
1206                 /* count */ ;
1207
1208         *urltail = *urllist;
1209         *urllist = *url;
1210         *url = NULL;
1211
1212         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1213         if ( li->li_uri ) {
1214                 ch_free( li->li_uri );
1215         }
1216
1217         ldap_get_option( ld, LDAP_OPT_URI, (void *)&li->li_uri );
1218         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1219
1220         return LDAP_SUCCESS;
1221 }
1222
1223 int
1224 ldap_back_cancel(
1225                 ldapconn_t              *lc,
1226                 Operation               *op,
1227                 SlapReply               *rs,
1228                 ber_int_t               msgid,
1229                 ldap_back_send_t        sendok )
1230 {
1231         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1232
1233         /* default behavior */
1234         if ( LDAP_BACK_ABANDON( li ) ) {
1235                 return ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1236         }
1237
1238         if ( LDAP_BACK_IGNORE( li ) ) {
1239                 return LDAP_SUCCESS;
1240         }
1241
1242         if ( LDAP_BACK_CANCEL( li ) ) {
1243                 /* FIXME: asynchronous? */
1244                 return ldap_cancel_s( lc->lc_ld, msgid, NULL, NULL );
1245         }
1246
1247         assert( 0 );
1248
1249         return LDAP_OTHER;
1250 }
1251
1252 int
1253 ldap_back_op_result(
1254                 ldapconn_t              *lc,
1255                 Operation               *op,
1256                 SlapReply               *rs,
1257                 ber_int_t               msgid,
1258                 time_t                  timeout,
1259                 ldap_back_send_t        sendok )
1260 {
1261         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1262
1263         char            *match = NULL;
1264         LDAPMessage     *res = NULL;
1265         char            *text = NULL;
1266         char            **refs = NULL;
1267         LDAPControl     **ctrls = NULL;
1268
1269 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1270
1271         rs->sr_text = NULL;
1272         rs->sr_matched = NULL;
1273         rs->sr_ref = NULL;
1274         rs->sr_ctrls = NULL;
1275
1276         /* if the error recorded in the reply corresponds
1277          * to a successful state, get the error from the
1278          * remote server response */
1279         if ( ERR_OK( rs->sr_err ) ) {
1280                 int             rc;
1281                 struct timeval  tv;
1282
1283                 if ( timeout ) {
1284                         tv.tv_sec = timeout;
1285                         tv.tv_usec = 0;
1286
1287                 } else {
1288                         LDAP_BACK_TV_SET( &tv );
1289                 }
1290
1291 retry:;
1292                 /* if result parsing fails, note the failure reason */
1293                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1294                 switch ( rc ) {
1295                 case 0:
1296                         if ( timeout ) {
1297                                 (void)ldap_back_cancel( lc, op, rs, msgid, sendok );
1298                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
1299                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
1300                                 rs->sr_text = "Operation timed out";
1301                                 break;
1302                         }
1303
1304                         LDAP_BACK_TV_SET( &tv );
1305                         ldap_pvt_thread_yield();
1306                         goto retry;
1307
1308                 case -1:
1309                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1310                                         &rs->sr_err );
1311                         break;
1312
1313
1314                 /* otherwise get the result; if it is not
1315                  * LDAP_SUCCESS, record it in the reply
1316                  * structure (this includes
1317                  * LDAP_COMPARE_{TRUE|FALSE}) */
1318                 default:
1319                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1320                                         &match, &text, &refs, &ctrls, 1 );
1321                         rs->sr_text = text;
1322                         if ( rc != LDAP_SUCCESS ) {
1323                                 rs->sr_err = rc;
1324                         }
1325                         if ( refs != NULL ) {
1326                                 int     i;
1327
1328                                 for ( i = 0; refs[ i ] != NULL; i++ )
1329                                         /* count */ ;
1330                                 rs->sr_ref = op->o_tmpalloc( sizeof( struct berval ) * ( i + 1 ),
1331                                         op->o_tmpmemctx );
1332                                 for ( i = 0; refs[ i ] != NULL; i++ ) {
1333                                         ber_str2bv( refs[ i ], 0, 0, &rs->sr_ref[ i ] );
1334                                 }
1335                                 BER_BVZERO( &rs->sr_ref[ i ] );
1336                         }
1337                         if ( ctrls != NULL ) {
1338                                 rs->sr_ctrls = ctrls;
1339                         }
1340                 }
1341         }
1342
1343         /* if the error in the reply structure is not
1344          * LDAP_SUCCESS, try to map it from client
1345          * to server error */
1346         if ( !ERR_OK( rs->sr_err ) ) {
1347                 rs->sr_err = slap_map_api2result( rs );
1348
1349                 /* internal ops ( op->o_conn == NULL )
1350                  * must not reply to client */
1351                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1352
1353                         /* record the (massaged) matched
1354                          * DN into the reply structure */
1355                         rs->sr_matched = match;
1356                 }
1357         }
1358         if ( LDAP_BACK_QUARANTINE( li ) ) {
1359                 ldap_back_quarantine( op, rs, 1 );
1360         }
1361         if ( op->o_conn &&
1362                 ( ( sendok & LDAP_BACK_SENDOK )
1363                         || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1364         {
1365                 send_ldap_result( op, rs );
1366         }
1367         if ( match ) {
1368                 if ( rs->sr_matched != match ) {
1369                         free( (char *)rs->sr_matched );
1370                 }
1371                 rs->sr_matched = NULL;
1372                 ldap_memfree( match );
1373         }
1374         if ( text ) {
1375                 ldap_memfree( text );
1376         }
1377         rs->sr_text = NULL;
1378         if ( rs->sr_ref ) {
1379                 assert( refs != NULL );
1380                 ber_memvfree( (void **)refs );
1381                 op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
1382                 rs->sr_ref = NULL;
1383         }
1384         if ( ctrls ) {
1385                 assert( rs->sr_ctrls != NULL );
1386                 ldap_controls_free( ctrls );
1387                 rs->sr_ctrls = NULL;
1388         }
1389         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1390 }
1391
1392 /* return true if bound, false if failed */
1393 int
1394 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1395 {
1396         int             rc = 0;
1397         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1398
1399         assert( lcp != NULL );
1400         assert( *lcp != NULL );
1401
1402         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1403
1404         if ( (*lcp)->lc_refcnt == 1 ) {
1405                 ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1406                 Debug( LDAP_DEBUG_ANY,
1407                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1408                         op->o_log_prefix, li->li_uri,
1409                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1410                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1411                 ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1412
1413                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1414                 (*lcp)->lc_ld = NULL;
1415                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1416
1417                 /* lc here must be the regular lc, reset and ready for init */
1418                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1419                 if ( rc != LDAP_SUCCESS ) {
1420                         rc = 0;
1421                         /* freeit, because lc_refcnt == 1 */
1422                         (void)ldap_back_conn_free( *lcp );
1423                         *lcp = NULL;
1424
1425                 } else {
1426                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1427                         if ( rc == 0 && *lcp != NULL ) {
1428                                 /* freeit, because lc_refcnt == 1 */
1429                                 (void)ldap_back_conn_free( *lcp );
1430                                 *lcp = NULL;
1431                         }
1432                 }
1433
1434         } else {
1435                 Debug( LDAP_DEBUG_TRACE,
1436                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1437                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1438
1439                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1440                 *lcp = NULL;
1441
1442                 if ( sendok ) {
1443                         rs->sr_err = LDAP_UNAVAILABLE;
1444                         rs->sr_text = "unable to retry";
1445                         send_ldap_result( op, rs );
1446                 }
1447         }
1448
1449         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1450
1451         return rc;
1452 }
1453
1454 static int
1455 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1456 {
1457         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1458         struct berval   binddn = slap_empty_bv;
1459         struct berval   bindcred = slap_empty_bv;
1460         struct berval   ndn;
1461         int             dobind = 0;
1462         int             msgid;
1463         int             rc;
1464
1465         /* don't proxyAuthz if protocol is not LDAPv3 */
1466         switch ( li->li_version ) {
1467         case LDAP_VERSION3:
1468                 break;
1469
1470         case 0:
1471                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1472                         break;
1473                 }
1474                 /* fall thru */
1475
1476         default:
1477                 goto done;
1478         }
1479
1480         if ( op->o_tag == LDAP_REQ_BIND ) {
1481                 ndn = op->o_req_ndn;
1482
1483         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1484                 ndn = op->o_conn->c_ndn;
1485
1486         } else {
1487                 ndn = op->o_ndn;
1488         }
1489
1490         /*
1491          * FIXME: we need to let clients use proxyAuthz
1492          * otherwise we cannot do symmetric pools of servers;
1493          * we have to live with the fact that a user can
1494          * authorize itself as any ID that is allowed
1495          * by the authzTo directive of the "proxyauthzdn".
1496          */
1497         /*
1498          * NOTE: current Proxy Authorization specification
1499          * and implementation do not allow proxy authorization
1500          * control to be provided with Bind requests
1501          */
1502         /*
1503          * if no bind took place yet, but the connection is bound
1504          * and the "proxyauthzdn" is set, then bind as
1505          * "proxyauthzdn" and explicitly add the proxyAuthz
1506          * control to every operation with the dn bound
1507          * to the connection as control value.
1508          */
1509
1510         /* bind as proxyauthzdn only if no idassert mode
1511          * is requested, or if the client's identity
1512          * is authorized */
1513         switch ( li->li_idassert_mode ) {
1514         case LDAP_BACK_IDASSERT_LEGACY:
1515                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1516                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1517                         {
1518                                 binddn = li->li_idassert_authcDN;
1519                                 bindcred = li->li_idassert_passwd;
1520                                 dobind = 1;
1521                         }
1522                 }
1523                 break;
1524
1525         default:
1526                 /* NOTE: rootdn can always idassert */
1527                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1528                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1529                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1530                                 if ( sendok & LDAP_BACK_SENDERR ) {
1531                                         send_ldap_result( op, rs );
1532                                 }
1533                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1534
1535                         } else {
1536                                 rs->sr_err = LDAP_SUCCESS;
1537                                 binddn = slap_empty_bv;
1538                                 bindcred = slap_empty_bv;
1539                                 break;
1540                         }
1541
1542                         goto done;
1543
1544                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1545                         struct berval authcDN;
1546
1547                         if ( BER_BVISNULL( &ndn ) ) {
1548                                 authcDN = slap_empty_bv;
1549
1550                         } else {
1551                                 authcDN = ndn;
1552                         }
1553                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1554                                         &authcDN, &authcDN );
1555                         if ( rs->sr_err != LDAP_SUCCESS ) {
1556                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1557                                         if ( sendok & LDAP_BACK_SENDERR ) {
1558                                                 send_ldap_result( op, rs );
1559                                         }
1560                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1561
1562                                 } else {
1563                                         rs->sr_err = LDAP_SUCCESS;
1564                                         binddn = slap_empty_bv;
1565                                         bindcred = slap_empty_bv;
1566                                         break;
1567                                 }
1568
1569                                 goto done;
1570                         }
1571                 }
1572
1573                 binddn = li->li_idassert_authcDN;
1574                 bindcred = li->li_idassert_passwd;
1575                 dobind = 1;
1576                 break;
1577         }
1578
1579         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1580 #ifdef HAVE_CYRUS_SASL
1581                 void            *defaults = NULL;
1582                 struct berval   authzID = BER_BVNULL;
1583                 int             freeauthz = 0;
1584
1585                 /* if SASL supports native authz, prepare for it */
1586                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1587                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1588                 {
1589                         switch ( li->li_idassert_mode ) {
1590                         case LDAP_BACK_IDASSERT_OTHERID:
1591                         case LDAP_BACK_IDASSERT_OTHERDN:
1592                                 authzID = li->li_idassert_authzID;
1593                                 break;
1594
1595                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1596                                 BER_BVSTR( &authzID, "dn:" );
1597                                 break;
1598
1599                         case LDAP_BACK_IDASSERT_SELF:
1600                                 if ( BER_BVISNULL( &ndn ) ) {
1601                                         /* connection is not authc'd, so don't idassert */
1602                                         BER_BVSTR( &authzID, "dn:" );
1603                                         break;
1604                                 }
1605                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1606                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1607                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1608                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1609                                                 ndn.bv_val, ndn.bv_len + 1 );
1610                                 freeauthz = 1;
1611                                 break;
1612
1613                         default:
1614                                 break;
1615                         }
1616                 }
1617
1618                 if ( li->li_idassert_secprops != NULL ) {
1619                         rs->sr_err = ldap_set_option( lc->lc_ld,
1620                                 LDAP_OPT_X_SASL_SECPROPS,
1621                                 (void *)li->li_idassert_secprops );
1622
1623                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1624                                 rs->sr_err = LDAP_OTHER;
1625                                 if ( sendok & LDAP_BACK_SENDERR ) {
1626                                         send_ldap_result( op, rs );
1627                                 }
1628                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1629                                 goto done;
1630                         }
1631                 }
1632
1633                 defaults = lutil_sasl_defaults( lc->lc_ld,
1634                                 li->li_idassert_sasl_mech.bv_val,
1635                                 li->li_idassert_sasl_realm.bv_val,
1636                                 li->li_idassert_authcID.bv_val,
1637                                 li->li_idassert_passwd.bv_val,
1638                                 authzID.bv_val );
1639
1640                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1641                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1642                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1643                                 defaults );
1644
1645                 rs->sr_err = slap_map_api2result( rs );
1646                 if ( rs->sr_err != LDAP_SUCCESS ) {
1647                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1648                         if ( sendok & LDAP_BACK_SENDERR ) {
1649                                 send_ldap_result( op, rs );
1650                         }
1651
1652                 } else {
1653                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1654                 }
1655
1656                 lutil_sasl_freedefs( defaults );
1657                 if ( freeauthz ) {
1658                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1659                 }
1660
1661                 goto done;
1662 #endif /* HAVE_CYRUS_SASL */
1663         }
1664
1665         switch ( li->li_idassert_authmethod ) {
1666         case LDAP_AUTH_NONE:
1667                 rc = LDAP_SUCCESS;
1668                 break;
1669
1670         case LDAP_AUTH_SIMPLE:
1671                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1672                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1673                                 &bindcred, NULL, NULL, &msgid );
1674                 rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1675                 break;
1676
1677         default:
1678                 /* unsupported! */
1679                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1680                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1681                 if ( sendok & LDAP_BACK_SENDERR ) {
1682                         send_ldap_result( op, rs );
1683                 }
1684                 goto done;
1685         }
1686
1687         if ( rc == LDAP_SUCCESS ) {
1688                 /* set rebind stuff in case of successful proxyAuthz bind,
1689                  * so that referral chasing is attempted using the right
1690                  * identity */
1691                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1692                 ber_dupbv( &lc->lc_bound_ndn, &binddn );
1693
1694                 if ( LDAP_BACK_SAVECRED( li ) ) {
1695                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
1696                                 memset( lc->lc_cred.bv_val, 0,
1697                                                 lc->lc_cred.bv_len );
1698                         }
1699                         ber_bvreplace( &lc->lc_cred, &bindcred );
1700                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
1701                 }
1702         }
1703 done:;
1704         return LDAP_BACK_CONN_ISBOUND( lc );
1705 }
1706
1707 /*
1708  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1709  * to existing server-side controls if required; if not,
1710  * the existing server-side controls are placed in *pctrls.
1711  * The caller, after using the controls in client API
1712  * operations, if ( *pctrls != op->o_ctrls ), should
1713  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1714  * The function returns success if the control could
1715  * be added if required, or if it did nothing; in the future,
1716  * it might return some error if it failed.
1717  *
1718  * if no bind took place yet, but the connection is bound
1719  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1720  * and explicitly add proxyAuthz the control to every operation
1721  * with the dn bound to the connection as control value.
1722  *
1723  * If no server-side controls are defined for the operation,
1724  * simply add the proxyAuthz control; otherwise, if the
1725  * proxyAuthz control is not already set, add it as
1726  * the first one
1727  *
1728  * FIXME: is controls order significant for security?
1729  * ANSWER: controls ordering and interoperability
1730  * must be indicated by the specs of each control; if none
1731  * is specified, the order is irrelevant.
1732  */
1733 int
1734 ldap_back_proxy_authz_ctrl(
1735                 ldapconn_t      *lc,
1736                 Operation       *op,
1737                 SlapReply       *rs,
1738                 LDAPControl     ***pctrls )
1739 {
1740         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1741         LDAPControl     **ctrls = NULL;
1742         int             i = 0,
1743                         mode;
1744         struct berval   assertedID,
1745                         ndn;
1746
1747         *pctrls = NULL;
1748
1749         rs->sr_err = LDAP_SUCCESS;
1750
1751         /* don't proxyAuthz if protocol is not LDAPv3 */
1752         switch ( li->li_version ) {
1753         case LDAP_VERSION3:
1754                 break;
1755
1756         case 0:
1757                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1758                         break;
1759                 }
1760                 /* fall thru */
1761
1762         default:
1763                 goto done;
1764         }
1765
1766         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1767          * but if it is not set this test fails.  We need a different
1768          * means to detect if idassert is enabled */
1769         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1770                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1771         {
1772                 goto done;
1773         }
1774
1775         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1776                 goto done;
1777         }
1778
1779         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1780                 ndn = op->o_conn->c_ndn;
1781
1782         } else {
1783                 ndn = op->o_ndn;
1784         }
1785
1786         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1787                 if ( op->o_proxy_authz ) {
1788                         /*
1789                          * FIXME: we do not want to perform proxyAuthz
1790                          * on behalf of the client, because this would
1791                          * be performed with "proxyauthzdn" privileges.
1792                          *
1793                          * This might actually be too strict, since
1794                          * the "proxyauthzdn" authzTo, and each entry's
1795                          * authzFrom attributes may be crafted
1796                          * to avoid unwanted proxyAuthz to take place.
1797                          */
1798 #if 0
1799                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1800                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1801 #endif
1802                         goto done;
1803                 }
1804
1805                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1806                         goto done;
1807                 }
1808
1809                 if ( BER_BVISNULL( &ndn ) ) {
1810                         goto done;
1811                 }
1812
1813                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1814                         goto done;
1815                 }
1816
1817         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1818                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1819                                 /* && ( !BER_BVISNULL( &ndn )
1820                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1821                 {
1822                         /* already asserted in SASL via native authz */
1823                         /* NOTE: the test on lc->lc_bound is used to trap
1824                          * native authorization of anonymous users,
1825                          * since in that case ndn is NULL */
1826                         goto done;
1827                 }
1828
1829         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1830                 int             rc;
1831                 struct berval authcDN;
1832
1833                 if ( BER_BVISNULL( &ndn ) ) {
1834                         authcDN = slap_empty_bv;
1835                 } else {
1836                         authcDN = ndn;
1837                 }
1838                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1839                                 &authcDN, & authcDN );
1840                 if ( rc != LDAP_SUCCESS ) {
1841                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1842                         {
1843                                 /* ndn is not authorized
1844                                  * to use idassert */
1845                                 rs->sr_err = rc;
1846                         }
1847                         goto done;
1848                 }
1849         }
1850
1851         if ( op->o_proxy_authz ) {
1852                 /*
1853                  * FIXME: we can:
1854                  * 1) ignore the already set proxyAuthz control
1855                  * 2) leave it in place, and don't set ours
1856                  * 3) add both
1857                  * 4) reject the operation
1858                  *
1859                  * option (4) is very drastic
1860                  * option (3) will make the remote server reject
1861                  * the operation, thus being equivalent to (4)
1862                  * option (2) will likely break the idassert
1863                  * assumptions, so we cannot accept it;
1864                  * option (1) means that we are contradicting
1865                  * the client's reques.
1866                  *
1867                  * I think (4) is the only correct choice.
1868                  */
1869                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1870                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1871         }
1872
1873         if ( op->o_is_auth_check ) {
1874                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1875
1876         } else {
1877                 mode = li->li_idassert_mode;
1878         }
1879
1880         switch ( mode ) {
1881         case LDAP_BACK_IDASSERT_SELF:
1882                 if ( BER_BVISNULL( &ndn ) ) {
1883                         goto done;
1884                 }
1885                 assertedID = ndn;
1886                 break;
1887
1888         case LDAP_BACK_IDASSERT_LEGACY:
1889                 /* original behavior:
1890                  * assert the client's identity */
1891                 if ( BER_BVISNULL( &ndn ) ) {
1892                         assertedID = slap_empty_bv;
1893                 } else {
1894                         assertedID = ndn;
1895                 }
1896                 break;
1897
1898         case LDAP_BACK_IDASSERT_ANONYMOUS:
1899                 /* assert "anonymous" */
1900                 assertedID = slap_empty_bv;
1901                 break;
1902
1903         case LDAP_BACK_IDASSERT_NOASSERT:
1904                 /* don't assert; bind as proxyauthzdn */
1905                 goto done;
1906
1907         case LDAP_BACK_IDASSERT_OTHERID:
1908         case LDAP_BACK_IDASSERT_OTHERDN:
1909                 /* assert idassert DN */
1910                 assertedID = li->li_idassert_authzID;
1911                 break;
1912
1913         default:
1914                 assert( 0 );
1915         }
1916
1917         if ( BER_BVISNULL( &assertedID ) ) {
1918                 assertedID = slap_empty_bv;
1919         }
1920
1921         /* don't idassert the bound DN (ITS#4497) */
1922         if ( dn_match( &assertedID, &lc->lc_bound_ndn ) ) {
1923                 goto done;
1924         }
1925
1926         if ( op->o_ctrls ) {
1927                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1928                         /* just count ctrls */ ;
1929         }
1930
1931         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1932                         op->o_tmpmemctx );
1933         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1934
1935         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1936         ctrls[ 0 ]->ldctl_iscritical = 1;
1937
1938         switch ( li->li_idassert_mode ) {
1939         /* already in u:ID or dn:DN form */
1940         case LDAP_BACK_IDASSERT_OTHERID:
1941         case LDAP_BACK_IDASSERT_OTHERDN:
1942                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1943                 break;
1944
1945         /* needs the dn: prefix */
1946         default:
1947                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1948                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1949                                 op->o_tmpmemctx );
1950                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1951                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1952                                 assertedID.bv_val, assertedID.bv_len + 1 );
1953                 break;
1954         }
1955
1956         /* Older versions of <draft-weltman-ldapv3-proxy> required
1957          * to encode the value of the authzID (and called it proxyDN);
1958          * this hack provides compatibility with those DSAs that
1959          * implement it this way */
1960         if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
1961                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
1962                 BerElementBuffer        berbuf;
1963                 BerElement              *ber = (BerElement *)&berbuf;
1964                 ber_tag_t               tag;
1965
1966                 ber_init2( ber, 0, LBER_USE_DER );
1967                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1968
1969                 tag = ber_printf( ber, "O", &authzID );
1970                 if ( tag == LBER_ERROR ) {
1971                         rs->sr_err = LDAP_OTHER;
1972                         goto free_ber;
1973                 }
1974
1975                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1976                         rs->sr_err = LDAP_OTHER;
1977                         goto free_ber;
1978                 }
1979
1980 free_ber:;
1981                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1982                 ber_free_buf( ber );
1983
1984                 if ( rs->sr_err != LDAP_SUCCESS ) {
1985                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1986                         ctrls = NULL;
1987                         goto done;
1988                 }
1989
1990         } else if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
1991                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
1992                                         tmp;
1993                 BerElementBuffer        berbuf;
1994                 BerElement              *ber = (BerElement *)&berbuf;
1995                 ber_tag_t               tag;
1996
1997                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
1998                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1999                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2000                         ctrls = NULL;
2001                         rs->sr_err = LDAP_PROTOCOL_ERROR;
2002                         goto done;
2003                 }
2004
2005                 tmp = authzID;
2006                 tmp.bv_val += STRLENOF( "dn:" );
2007                 tmp.bv_len -= STRLENOF( "dn:" );
2008
2009                 ber_init2( ber, 0, LBER_USE_DER );
2010                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
2011
2012                 /* apparently, Mozilla API encodes this
2013                  * as "SEQUENCE { LDAPDN }" */
2014                 tag = ber_printf( ber, "{O}", &tmp );
2015                 if ( tag == LBER_ERROR ) {
2016                         rs->sr_err = LDAP_OTHER;
2017                         goto free_ber2;
2018                 }
2019
2020                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
2021                         rs->sr_err = LDAP_OTHER;
2022                         goto free_ber2;
2023                 }
2024
2025 free_ber2:;
2026                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
2027                 ber_free_buf( ber );
2028
2029                 if ( rs->sr_err != LDAP_SUCCESS ) {
2030                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2031                         ctrls = NULL;
2032                         goto done;
2033                 }
2034
2035                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
2036         }
2037
2038         if ( op->o_ctrls ) {
2039                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
2040                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
2041                 }
2042         }
2043         ctrls[ i + 1 ] = NULL;
2044
2045 done:;
2046         if ( ctrls == NULL ) {
2047                 ctrls = op->o_ctrls;
2048         }
2049
2050         *pctrls = ctrls;
2051
2052         return rs->sr_err;
2053 }
2054
2055 int
2056 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
2057 {
2058         LDAPControl     **ctrls = *pctrls;
2059
2060         /* we assume that the first control is the proxyAuthz
2061          * added by back-ldap, so it's the only one we explicitly
2062          * free */
2063         if ( ctrls && ctrls != op->o_ctrls ) {
2064                 assert( ctrls[ 0 ] != NULL );
2065
2066                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
2067                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2068                 }
2069
2070                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
2071         }
2072
2073         *pctrls = NULL;
2074
2075         return 0;
2076 }