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 1999-2008 The OpenLDAP Foundation.
   6  * Portions Copyright 2000-2003 Pierangelo Masarati.
   7  * Portions Copyright 1999-2003 Howard Chu.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted only as authorized by the OpenLDAP
  12  * Public License.
  13  *
  14  * A copy of this license is available in the file LICENSE in the
  15  * top-level directory of the distribution or, alternatively, at
  16  * <http://www.OpenLDAP.org/license.html>.
  17  */
  18 /* ACKNOWLEDGEMENTS:
  19  * This work was initially developed by Howard Chu for inclusion
  20  * in OpenLDAP Software and subsequently enhanced by Pierangelo
  21  * Masarati.
  22  */
  23
  24 #include "portable.h"
  25
  26 #include <stdio.h>
  27
  28 #include <ac/errno.h>
  29 #include <ac/socket.h>
  30 #include <ac/string.h>
  31
  32 #define AVL_INTERNAL
  33 #include "slap.h"
  34 #include "back-ldap.h"
  35 #undef ldap_debug       /* silence a warning in ldap-int.h */
  36 #include "../../../libraries/libldap/ldap-int.h"
  37
  38 #include "lutil_ldap.h"
  39
  40 #define LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ       "2.16.840.1.113730.3.4.12"
  41
  42 #if LDAP_BACK_PRINT_CONNTREE > 0
  43 static void
  44 ldap_back_ravl_print( Avlnode *root, int depth )
  45 {
  46         int             i;
  47         ldapconn_t      *lc;
  48
  49         if ( root == 0 ) {
  50                 return;
  51         }
  52
  53         ldap_back_ravl_print( root->avl_right, depth+1 );
  54
  55         for ( i = 0; i < depth; i++ ) {
  56                 fprintf( stderr, "-" );
  57         }
  58
  59         lc = root->avl_data;
  60         fprintf( stderr, "lc=%p local=\"%s\" conn=%p %s refcnt=%d flags=0x%08x\n",
  61                 (void *)lc,
  62                 lc->lc_local_ndn.bv_val ? lc->lc_local_ndn.bv_val : "",
  63                 (void *)lc->lc_conn,
  64                 avl_bf2str( root->avl_bf ), lc->lc_refcnt, lc->lc_lcflags );
  65
  66         ldap_back_ravl_print( root->avl_left, depth+1 );
  67 }
  68
  69 static char* priv2str[] = {
  70         "privileged",
  71         "privileged/TLS",
  72         "anonymous",
  73         "anonymous/TLS",
  74         "bind",
  75         "bind/TLS",
  76         NULL
  77 };
  78
  79 void
  80 ldap_back_print_conntree( ldapinfo_t *li, char *msg )
  81 {
  82         int     c;
  83
  84         fprintf( stderr, "========> %s\n", msg );
  85
  86         for ( c = LDAP_BACK_PCONN_FIRST; c < LDAP_BACK_PCONN_LAST; c++ ) {
  87                 int             i = 0;
  88                 ldapconn_t      *lc;
  89
  90                 fprintf( stderr, "  %s[%d]\n", priv2str[ c ], li->li_conn_priv[ c ].lic_num );
  91
  92                 LDAP_TAILQ_FOREACH( lc, &li->li_conn_priv[ c ].lic_priv, lc_q )
  93                 {
  94                         fprintf( stderr, "    [%d] lc=%p local=\"%s\" conn=%p refcnt=%d flags=0x%08x\n",
  95                                 i,
  96                                 (void *)lc,
  97                                 lc->lc_local_ndn.bv_val ? lc->lc_local_ndn.bv_val : "",
  98                                 (void *)lc->lc_conn, lc->lc_refcnt, lc->lc_lcflags );
  99                         i++;
 100                 }
 101         }
 102
 103         if ( li->li_conninfo.lai_tree == 0 ) {
 104                 fprintf( stderr, "\t(empty)\n" );
 105
 106         } else {
 107                 ldap_back_ravl_print( li->li_conninfo.lai_tree, 0 );
 108         }
 109
 110         fprintf( stderr, "<======== %s\n", msg );
 111 }
 112 #endif /* LDAP_BACK_PRINT_CONNTREE */
 113
 114 static int
 115 ldap_back_freeconn( ldapinfo_t *li, ldapconn_t *lc, int dolock );
 116
 117 static ldapconn_t *
 118 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok,
 119         struct berval *binddn, struct berval *bindcred );
 120
 121 static int
 122 ldap_back_is_proxy_authz( Operation *op, SlapReply *rs, ldap_back_send_t sendok,
 123         struct berval *binddn, struct berval *bindcred );
 124
 125 static int
 126 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs,
 127         ldap_back_send_t sendok, struct berval *binddn, struct berval *bindcred );
 128
 129 static int
 130 ldap_back_prepare_conn( ldapconn_t *lc, Operation *op, SlapReply *rs,
 131         ldap_back_send_t sendok );
 132
 133 static int
 134 ldap_back_conndnlc_cmp( const void *c1, const void *c2 );
 135
 136 ldapconn_t *
 137 ldap_back_conn_delete( ldapinfo_t *li, ldapconn_t *lc )
 138 {
 139         if ( LDAP_BACK_PCONN_ISPRIV( lc ) ) {
 140                 if ( LDAP_BACK_CONN_CACHED( lc ) ) {
 141                         assert( lc->lc_q.tqe_prev != NULL );
 142                         assert( li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_num > 0 );
 143                         li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_num--;
 144                         LDAP_TAILQ_REMOVE( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv, lc, lc_q );
 145                         LDAP_TAILQ_ENTRY_INIT( lc, lc_q );
 146                         LDAP_BACK_CONN_CACHED_CLEAR( lc );
 147
 148                 } else {
 149                         assert( LDAP_BACK_CONN_TAINTED( lc ) );
 150                         assert( lc->lc_q.tqe_prev == NULL );
 151                 }
 152
 153         } else {
 154                 ldapconn_t      *tmplc = NULL;
 155
 156                 if ( LDAP_BACK_CONN_CACHED( lc ) ) {
 157                         assert( !LDAP_BACK_CONN_TAINTED( lc ) );
 158                         tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 159                                 ldap_back_conndnlc_cmp );
 160                         assert( tmplc == lc );
 161                         LDAP_BACK_CONN_CACHED_CLEAR( lc );
 162                 }
 163
 164                 assert( LDAP_BACK_CONN_TAINTED( lc ) || tmplc == lc );
 165         }
 166
 167         return lc;
 168 }
 169
 170 int
 171 ldap_back_bind( Operation *op, SlapReply *rs )
 172 {
 173         ldapinfo_t              *li = (ldapinfo_t *) op->o_bd->be_private;
 174         ldapconn_t              *lc;
 175
 176         int                     rc = 0;
 177         ber_int_t               msgid;
 178         ldap_back_send_t        retrying = LDAP_BACK_RETRYING;
 179
 180         lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR, NULL, NULL );
 181         if ( !lc ) {
 182                 return rs->sr_err;
 183         }
 184
 185         /* we can do (almost) whatever we want with this conn,
 186          * because either it's temporary, or it's marked as binding */
 187         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
 188                 ch_free( lc->lc_bound_ndn.bv_val );
 189                 BER_BVZERO( &lc->lc_bound_ndn );
 190         }
 191         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
 192                 memset( lc->lc_cred.bv_val, 0, lc->lc_cred.bv_len );
 193                 ch_free( lc->lc_cred.bv_val );
 194                 BER_BVZERO( &lc->lc_cred );
 195         }
 196         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 197
 198 retry:;
 199         /* method is always LDAP_AUTH_SIMPLE if we got here */
 200         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
 201                         LDAP_SASL_SIMPLE,
 202                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
 203         /* FIXME: should we always retry, or only when piping the bind
 204          * in the "override" connection pool? */
 205         rc = ldap_back_op_result( lc, op, rs, msgid,
 206                 li->li_timeout[ SLAP_OP_BIND ],
 207                 LDAP_BACK_BIND_SERR | retrying );
 208         if ( rc == LDAP_UNAVAILABLE && retrying ) {
 209                 retrying &= ~LDAP_BACK_RETRYING;
 210                 if ( ldap_back_retry( &lc, op, rs, LDAP_BACK_BIND_SERR ) ) {
 211                         goto retry;
 212                 }
 213         }
 214
 215         if ( rc == LDAP_SUCCESS ) {
 216                 /* If defined, proxyAuthz will be used also when
 217                  * back-ldap is the authorizing backend; for this
 218                  * purpose, after a successful bind the connection
 219                  * is left for further binds, and further operations
 220                  * on this client connection will use a default
 221                  * connection with identity assertion */
 222                 /* NOTE: use with care */
 223                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
 224                         ldap_back_release_conn( li, lc );
 225                         return( rc );
 226                 }
 227
 228                 /* rebind is now done inside ldap_back_proxy_authz_bind()
 229                  * in case of success */
 230                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 231                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
 232
 233                 if ( !BER_BVISNULL( &lc->lc_cred ) ) {
 234                         memset( lc->lc_cred.bv_val, 0,
 235                                         lc->lc_cred.bv_len );
 236                 }
 237
 238                 if ( LDAP_BACK_SAVECRED( li ) ) {
 239                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
 240                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
 241
 242                 } else {
 243                         lc->lc_cred.bv_len = 0;
 244                 }
 245         }
 246
 247         /* must re-insert if local DN changed as result of bind */
 248         if ( !LDAP_BACK_CONN_ISBOUND( lc )
 249                 || ( !dn_match( &op->o_req_ndn, &lc->lc_local_ndn )
 250                         && !LDAP_BACK_PCONN_ISPRIV( lc ) ) )
 251         {
 252                 int             lerr = -1;
 253                 ldapconn_t      *tmplc;
 254
 255                 /* wait for all other ops to release the connection */
 256 retry_lock:;
 257                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 258                 if ( lc->lc_refcnt > 1 ) {
 259                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 260                         ldap_pvt_thread_yield();
 261                         goto retry_lock;
 262                 }
 263
 264 #if LDAP_BACK_PRINT_CONNTREE > 0
 265                 ldap_back_print_conntree( li, ">>> ldap_back_bind" );
 266 #endif /* LDAP_BACK_PRINT_CONNTREE */
 267
 268                 assert( lc->lc_refcnt == 1 );
 269                 ldap_back_conn_delete( li, lc );
 270
 271                 /* delete all cached connections with the current connection */
 272                 if ( LDAP_BACK_SINGLECONN( li ) ) {
 273                         while ( ( tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc, ldap_back_conn_cmp ) ) != NULL )
 274                         {
 275                                 Debug( LDAP_DEBUG_TRACE,
 276                                         "=>ldap_back_bind: destroying conn %ld (refcnt=%u)\n",
 277                                         LDAP_BACK_PCONN_ID( lc ), lc->lc_refcnt, 0 );
 278
 279                                 if ( tmplc->lc_refcnt != 0 ) {
 280                                         /* taint it */
 281                                         LDAP_BACK_CONN_TAINTED_SET( tmplc );
 282                                         LDAP_BACK_CONN_CACHED_CLEAR( tmplc );
 283
 284                                 } else {
 285                                         /*
 286                                          * Needs a test because the handler may be corrupted,
 287                                          * and calling ldap_unbind on a corrupted header results
 288                                          * in a segmentation fault
 289                                          */
 290                                         ldap_back_conn_free( tmplc );
 291                                 }
 292                         }
 293                 }
 294
 295                 if ( LDAP_BACK_CONN_ISBOUND( lc ) ) {
 296                         ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 297                         if ( be_isroot_dn( op->o_bd, &op->o_req_ndn ) ) {
 298                                 LDAP_BACK_PCONN_ROOTDN_SET( lc, op );
 299                         }
 300                         lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 301                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
 302                 }
 303
 304 #if LDAP_BACK_PRINT_CONNTREE > 0
 305                 ldap_back_print_conntree( li, "<<< ldap_back_bind" );
 306 #endif /* LDAP_BACK_PRINT_CONNTREE */
 307
 308                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 309                 switch ( lerr ) {
 310                 case 0:
 311                         LDAP_BACK_CONN_CACHED_SET( lc );
 312                         break;
 313
 314                 case -1:
 315                         /* duplicate; someone else successfully bound
 316                          * on the same connection with the same identity;
 317                          * we can do this because lc_refcnt == 1 */
 318                         ldap_back_conn_free( lc );
 319                         lc = NULL;
 320                 }
 321         }
 322
 323         if ( lc != NULL ) {
 324                 ldap_back_release_conn( li, lc );
 325         }
 326
 327         return( rc );
 328 }
 329
 330 /*
 331  * ldap_back_conndn_cmp
 332  *
 333  * compares two ldapconn_t based on the value of the conn pointer
 334  * and of the local DN; used by avl stuff for insert, lookup
 335  * and direct delete
 336  */
 337 int
 338 ldap_back_conndn_cmp( const void *c1, const void *c2 )
 339 {
 340         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 341         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 342         int rc;
 343
 344         /* If local DNs don't match, it is definitely not a match */
 345         /* For shared sessions, conn is NULL. Only explicitly
 346          * bound sessions will have non-NULL conn.
 347          */
 348         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 349         if ( rc == 0 ) {
 350                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 351         }
 352
 353         return rc;
 354 }
 355
 356 /*
 357  * ldap_back_conndnlc_cmp
 358  *
 359  * compares two ldapconn_t based on the value of the conn pointer,
 360  * the local DN and the lc pointer; used by avl stuff for insert, lookup
 361  * and direct delete
 362  */
 363 static int
 364 ldap_back_conndnlc_cmp( const void *c1, const void *c2 )
 365 {
 366         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 367         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 368         int rc;
 369
 370         /* If local DNs don't match, it is definitely not a match */
 371         /* For shared sessions, conn is NULL. Only explicitly
 372          * bound sessions will have non-NULL conn.
 373          */
 374         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 375         if ( rc == 0 ) {
 376                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 377                 if ( rc == 0 ) {
 378                         rc = SLAP_PTRCMP( lc1, lc2 );
 379                 }
 380         }
 381
 382         return rc;
 383 }
 384
 385 /*
 386  * ldap_back_conn_cmp
 387  *
 388  * compares two ldapconn_t based on the value of the conn pointer;
 389  * used by avl stuff for delete of all conns with the same connid
 390  */
 391 int
 392 ldap_back_conn_cmp( const void *c1, const void *c2 )
 393 {
 394         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 395         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 396
 397         /* For shared sessions, conn is NULL. Only explicitly
 398          * bound sessions will have non-NULL conn.
 399          */
 400         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 401 }
 402
 403 /*
 404  * ldap_back_conndn_dup
 405  *
 406  * returns -1 in case a duplicate ldapconn_t has been inserted;
 407  * used by avl stuff
 408  */
 409 int
 410 ldap_back_conndn_dup( void *c1, void *c2 )
 411 {
 412         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 413         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 414
 415         /* Cannot have more than one shared session with same DN */
 416         if ( lc1->lc_conn == lc2->lc_conn &&
 417                 dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) )
 418         {
 419                 return -1;
 420         }
 421
 422         return 0;
 423 }
 424
 425 static int
 426 ldap_back_freeconn( ldapinfo_t *li, ldapconn_t *lc, int dolock )
 427 {
 428         if ( dolock ) {
 429                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 430         }
 431
 432 #if LDAP_BACK_PRINT_CONNTREE > 0
 433         ldap_back_print_conntree( li, ">>> ldap_back_freeconn" );
 434 #endif /* LDAP_BACK_PRINT_CONNTREE */
 435
 436         (void)ldap_back_conn_delete( li, lc );
 437
 438         if ( lc->lc_refcnt == 0 ) {
 439                 ldap_back_conn_free( (void *)lc );
 440         }
 441
 442 #if LDAP_BACK_PRINT_CONNTREE > 0
 443         ldap_back_print_conntree( li, "<<< ldap_back_freeconn" );
 444 #endif /* LDAP_BACK_PRINT_CONNTREE */
 445
 446         if ( dolock ) {
 447                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 448         }
 449
 450         return 0;
 451 }
 452
 453 #ifdef HAVE_TLS
 454 static int
 455 ldap_back_start_tls(
 456         LDAP            *ld,
 457         int             protocol,
 458         int             *is_tls,
 459         const char      *url,
 460         unsigned        flags,
 461         int             retries,
 462         const char      **text )
 463 {
 464         int             rc = LDAP_SUCCESS;
 465
 466         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 467         if ( ( LDAP_BACK_USE_TLS_F( flags ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS_F( flags ) ) )
 468                                 && !ldap_is_ldaps_url( url ) )
 469         {
 470 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 471                 /*
 472                  * use asynchronous StartTLS
 473                  * in case, chase referral (not implemented yet)
 474                  */
 475                 int             msgid;
 476
 477                 if ( protocol == 0 ) {
 478                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 479                                         (void *)&protocol );
 480                 }
 481
 482                 if ( protocol < LDAP_VERSION3 ) {
 483                         /* we should rather bail out... */
 484                         rc = LDAP_UNWILLING_TO_PERFORM;
 485                         *text = "invalid protocol version";
 486                 }
 487
 488                 if ( rc == LDAP_SUCCESS ) {
 489                         rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 490                 }
 491
 492                 if ( rc == LDAP_SUCCESS ) {
 493                         LDAPMessage     *res = NULL;
 494                         struct timeval  tv;
 495
 496                         LDAP_BACK_TV_SET( &tv );
 497
 498 retry:;
 499                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 500                         if ( rc < 0 ) {
 501                                 rc = LDAP_UNAVAILABLE;
 502
 503                         } else if ( rc == 0 ) {
 504                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 505                                         ldap_pvt_thread_yield();
 506                                         if ( retries > 0 ) {
 507                                                 retries--;
 508                                         }
 509                                         LDAP_BACK_TV_SET( &tv );
 510                                         goto retry;
 511                                 }
 512                                 rc = LDAP_UNAVAILABLE;
 513
 514                         } else if ( rc == LDAP_RES_EXTENDED ) {
 515                                 struct berval   *data = NULL;
 516
 517                                 rc = ldap_parse_extended_result( ld, res,
 518                                                 NULL, &data, 0 );
 519                                 if ( rc == LDAP_SUCCESS ) {
 520                                         int err;
 521                                         rc = ldap_parse_result( ld, res, &err,
 522                                                 NULL, NULL, NULL, NULL, 1 );
 523                                         if ( rc == LDAP_SUCCESS ) {
 524                                                 rc = err;
 525                                         }
 526                                         res = NULL;
 527
 528                                         /* FIXME: in case a referral
 529                                          * is returned, should we try
 530                                          * using it instead of the
 531                                          * configured URI? */
 532                                         if ( rc == LDAP_SUCCESS ) {
 533                                                 rc = ldap_install_tls( ld );
 534
 535                                         } else if ( rc == LDAP_REFERRAL ) {
 536                                                 rc = LDAP_UNWILLING_TO_PERFORM;
 537                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 538                                         }
 539
 540                                         if ( data ) {
 541                                                 if ( data->bv_val ) {
 542                                                         ber_memfree( data->bv_val );
 543                                                 }
 544                                                 ber_memfree( data );
 545                                         }
 546                                 }
 547
 548                         } else {
 549                                 rc = LDAP_OTHER;
 550                         }
 551
 552                         if ( res != NULL ) {
 553                                 ldap_msgfree( res );
 554                         }
 555                 }
 556 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 557                 /*
 558                  * use synchronous StartTLS
 559                  */
 560                 rc = ldap_start_tls_s( ld, NULL, NULL );
 561 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 562
 563                 /* if StartTLS is requested, only attempt it if the URL
 564                  * is not "ldaps://"; this may occur not only in case
 565                  * of misconfiguration, but also when used in the chain
 566                  * overlay, where the "uri" can be parsed out of a referral */
 567                 switch ( rc ) {
 568                 case LDAP_SUCCESS:
 569                         *is_tls = 1;
 570                         break;
 571
 572                 case LDAP_SERVER_DOWN:
 573                         break;
 574
 575                 default:
 576                         if ( LDAP_BACK_TLS_CRITICAL_F( flags ) ) {
 577                                 *text = "could not start TLS";
 578                                 break;
 579                         }
 580
 581                         /* in case Start TLS is not critical */
 582                         *is_tls = 0;
 583                         rc = LDAP_SUCCESS;
 584                         break;
 585                 }
 586
 587         } else {
 588                 *is_tls = 0;
 589         }
 590
 591         return rc;
 592 }
 593 #endif /* HAVE_TLS */
 594
 595 static int
 596 ldap_back_prepare_conn( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 597 {
 598         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 599         int             version;
 600         LDAP            *ld = NULL;
 601 #ifdef HAVE_TLS
 602         int             is_tls = op->o_conn->c_is_tls;
 603         time_t          lc_time = (time_t)(-1);
 604 #endif /* HAVE_TLS */
 605
 606         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 607         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 608         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 609         if ( rs->sr_err != LDAP_SUCCESS ) {
 610                 goto error_return;
 611         }
 612
 613         /* Set LDAP version. This will always succeed: If the client
 614          * bound with a particular version, then so can we.
 615          */
 616         if ( li->li_version != 0 ) {
 617                 version = li->li_version;
 618
 619         } else if ( op->o_protocol != 0 ) {
 620                 version = op->o_protocol;
 621
 622         } else {
 623                 /* assume it's an internal op; set to LDAPv3 */
 624                 version = LDAP_VERSION3;
 625         }
 626         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&version );
 627
 628         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 629         ldap_set_option( ld, LDAP_OPT_REFERRALS,
 630                 LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 631
 632         if ( li->li_network_timeout > 0 ) {
 633                 struct timeval          tv;
 634
 635                 tv.tv_sec = li->li_network_timeout;
 636                 tv.tv_usec = 0;
 637                 ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
 638         }
 639
 640 #ifdef HAVE_TLS
 641         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 642         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 643                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 644         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 645         if ( rs->sr_err != LDAP_SUCCESS ) {
 646                 ldap_unbind_ext( ld, NULL, NULL );
 647                 rs->sr_text = "Start TLS failed";
 648                 goto error_return;
 649
 650         } else if ( li->li_idle_timeout ) {
 651                 /* only touch when activity actually took place... */
 652                 lc_time = op->o_time;
 653         }
 654 #endif /* HAVE_TLS */
 655
 656         lc->lc_ld = ld;
 657         lc->lc_refcnt = 1;
 658 #ifdef HAVE_TLS
 659         if ( is_tls ) {
 660                 LDAP_BACK_CONN_ISTLS_SET( lc );
 661         } else {
 662                 LDAP_BACK_CONN_ISTLS_CLEAR( lc );
 663         }
 664         if ( lc_time != (time_t)(-1) ) {
 665                 lc->lc_time = lc_time;
 666         }
 667 #endif /* HAVE_TLS */
 668
 669 error_return:;
 670         if ( rs->sr_err != LDAP_SUCCESS ) {
 671                 rs->sr_err = slap_map_api2result( rs );
 672                 if ( sendok & LDAP_BACK_SENDERR ) {
 673                         if ( rs->sr_text == NULL ) {
 674                                 rs->sr_text = "Proxy connection initialization failed";
 675                         }
 676                         send_ldap_result( op, rs );
 677                 }
 678
 679         } else {
 680                 if ( li->li_conn_ttl > 0 ) {
 681                         lc->lc_create_time = op->o_time;
 682                 }
 683         }
 684
 685         return rs->sr_err;
 686 }
 687
 688 static ldapconn_t *
 689 ldap_back_getconn(
 690         Operation               *op,
 691         SlapReply               *rs,
 692         ldap_back_send_t        sendok,
 693         struct berval           *binddn,
 694         struct berval           *bindcred )
 695 {
 696         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 697         ldapconn_t      *lc = NULL,
 698                         lc_curr = { 0 };
 699         int             refcnt = 1,
 700                         lookupconn = !( sendok & LDAP_BACK_BINDING );
 701
 702         /* if the server is quarantined, and
 703          * - the current interval did not expire yet, or
 704          * - no more retries should occur,
 705          * don't return the connection */
 706         if ( li->li_isquarantined ) {
 707                 slap_retry_info_t       *ri = &li->li_quarantine;
 708                 int                     dont_retry = 1;
 709
 710                 if ( li->li_quarantine.ri_interval ) {
 711                         ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
 712                         if ( li->li_isquarantined == LDAP_BACK_FQ_YES ) {
 713                                 dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
 714                                         || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
 715                                 if ( !dont_retry ) {
 716                                         Debug( LDAP_DEBUG_ANY,
 717                                                 "%s: ldap_back_getconn quarantine "
 718                                                 "retry block #%d try #%d.\n",
 719                                                 op->o_log_prefix, ri->ri_idx, ri->ri_count );
 720                                         li->li_isquarantined = LDAP_BACK_FQ_RETRYING;
 721                                 }
 722                         }
 723                         ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
 724                 }
 725
 726                 if ( dont_retry ) {
 727                         rs->sr_err = LDAP_UNAVAILABLE;
 728                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 729                                 rs->sr_text = "Target is quarantined";
 730                                 send_ldap_result( op, rs );
 731                         }
 732                         return NULL;
 733                 }
 734         }
 735
 736         /* Internal searches are privileged and shared. So is root. */
 737         if ( op->o_do_not_cache || be_isroot( op ) ) {
 738                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 739                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 740                 LDAP_BACK_PCONN_ROOTDN_SET( &lc_curr, op );
 741
 742         } else {
 743                 struct berval   tmpbinddn,
 744                                 tmpbindcred,
 745                                 save_o_dn,
 746                                 save_o_ndn;
 747                 int             isproxyauthz;
 748
 749                 /* need cleanup */
 750                 if ( binddn == NULL ) {
 751                         binddn = &tmpbinddn;
 752                 }
 753                 if ( bindcred == NULL ) {
 754                         bindcred = &tmpbindcred;
 755                 }
 756                 if ( op->o_tag == LDAP_REQ_BIND ) {
 757                         save_o_dn = op->o_dn;
 758                         save_o_ndn = op->o_ndn;
 759                         op->o_dn = op->o_req_dn;
 760                         op->o_ndn = op->o_req_ndn;
 761                 }
 762                 isproxyauthz = ldap_back_is_proxy_authz( op, rs, sendok, binddn, bindcred );
 763                 if ( op->o_tag == LDAP_REQ_BIND ) {
 764                         op->o_dn = save_o_dn;
 765                         op->o_ndn = save_o_ndn;
 766                 }
 767                 if ( isproxyauthz == -1 ) {
 768                         return NULL;
 769                 }
 770
 771                 lc_curr.lc_local_ndn = op->o_ndn;
 772                 /* Explicit binds must not be shared;
 773                  * however, explicit binds are piped in a special connection
 774                  * when idassert is to occur with "override" set */
 775                 if ( op->o_tag == LDAP_REQ_BIND && !isproxyauthz ) {
 776                         lc_curr.lc_conn = op->o_conn;
 777
 778                 } else {
 779                         if ( isproxyauthz && !( sendok & LDAP_BACK_BINDING ) ) {
 780                                 lc_curr.lc_local_ndn = *binddn;
 781                                 LDAP_BACK_PCONN_ROOTDN_SET( &lc_curr, op );
 782                                 LDAP_BACK_CONN_ISIDASSERT_SET( &lc_curr );
 783
 784                         } else if ( isproxyauthz && ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) {
 785                                 lc_curr.lc_local_ndn = slap_empty_bv;
 786                                 LDAP_BACK_PCONN_BIND_SET( &lc_curr, op );
 787                                 LDAP_BACK_CONN_ISIDASSERT_SET( &lc_curr );
 788                                 lookupconn = 1;
 789
 790                         } else if ( SLAP_IS_AUTHZ_BACKEND( op ) ) {
 791                                 lc_curr.lc_conn = op->o_conn;
 792
 793                         } else {
 794                                 LDAP_BACK_PCONN_ANON_SET( &lc_curr, op );
 795                         }
 796                 }
 797         }
 798
 799         /* Explicit Bind requests always get their own conn */
 800         if ( lookupconn ) {
 801 retry_lock:
 802                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 803                 if ( LDAP_BACK_PCONN_ISPRIV( &lc_curr ) ) {
 804                         /* lookup a conn that's not binding */
 805                         LDAP_TAILQ_FOREACH( lc,
 806                                 &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( &lc_curr ) ].lic_priv,
 807                                 lc_q )
 808                         {
 809                                 if ( !LDAP_BACK_CONN_BINDING( lc ) && lc->lc_refcnt == 0 ) {
 810                                         break;
 811                                 }
 812                         }
 813
 814                         if ( lc != NULL ) {
 815                                 if ( lc != LDAP_TAILQ_LAST( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv,
 816                                         ldapconn_t, lc_q ) )
 817                                 {
 818                                         LDAP_TAILQ_REMOVE( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv,
 819                                                 lc, lc_q );
 820                                         LDAP_TAILQ_ENTRY_INIT( lc, lc_q );
 821                                         LDAP_TAILQ_INSERT_TAIL( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv,
 822                                                 lc, lc_q );
 823                                 }
 824
 825                         } else if ( !LDAP_BACK_USE_TEMPORARIES( li )
 826                                 && li->li_conn_priv[ LDAP_BACK_CONN2PRIV( &lc_curr ) ].lic_num == li->li_conn_priv_max )
 827                         {
 828                                 lc = LDAP_TAILQ_FIRST( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( &lc_curr ) ].lic_priv );
 829                         }
 830
 831                 } else {
 832
 833                         /* Searches for a ldapconn in the avl tree */
 834                         lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 835                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 836                 }
 837
 838                 if ( lc != NULL ) {
 839                         /* Don't reuse connections while they're still binding */
 840                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 841                                 if ( !LDAP_BACK_USE_TEMPORARIES( li ) ) {
 842                                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 843
 844                                         ldap_pvt_thread_yield();
 845                                         goto retry_lock;
 846                                 }
 847                                 lc = NULL;
 848                         }
 849
 850                         if ( lc != NULL ) {
 851                                 if ( op->o_tag == LDAP_REQ_BIND ) {
 852                                         /* right now, this is the only possible case */
 853                                         assert( ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) );
 854                                         LDAP_BACK_CONN_BINDING_SET( lc );
 855                                 }
 856
 857                                 refcnt = ++lc->lc_refcnt;
 858                         }
 859                 }
 860                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 861         }
 862
 863         /* Looks like we didn't get a bind. Open a new session... */
 864         if ( lc == NULL ) {
 865                 lc = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 866                 lc->lc_flags = li->li_flags;
 867                 lc->lc_lcflags = lc_curr.lc_lcflags;
 868                 if ( ldap_back_prepare_conn( lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 869                         ch_free( lc );
 870                         return NULL;
 871                 }
 872
 873                 if ( sendok & LDAP_BACK_BINDING ) {
 874                         LDAP_BACK_CONN_BINDING_SET( lc );
 875                 }
 876
 877                 lc->lc_conn = lc_curr.lc_conn;
 878                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 879
 880                 /*
 881                  * the rationale is: connections as the rootdn are privileged,
 882                  * so acl_authcDN is to be used; however, in some cases
 883                  * one already configured identity assertion with a highly
 884                  * privileged idassert_authcDN, so if acl_authcDN is NULL
 885                  * and idassert_authcDN is not, use the second instead.
 886                  *
 887                  * might change in the future, because it's preferable
 888                  * to make clear what identity is being used, since
 889                  * the only drawback is that one risks to configure
 890                  * the same identity twice...
 891                  */
 892                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 893                         if ( BER_BVISNULL( &li->li_acl_authcDN ) && !BER_BVISNULL( &li->li_idassert_authcDN ) ) {
 894                                 ber_dupbv( &lc->lc_bound_ndn, &li->li_idassert_authcDN );
 895                                 ber_dupbv( &lc->lc_cred, &li->li_idassert_passwd );
 896
 897                         } else {
 898                                 ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 899                                 ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 900                         }
 901                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 902
 903                 } else if ( LDAP_BACK_CONN_ISIDASSERT( &lc_curr ) ) {
 904                         if ( !LDAP_BACK_PCONN_ISBIND( &lc_curr ) ) {
 905                                 ber_dupbv( &lc->lc_bound_ndn, &li->li_idassert_authcDN );
 906                                 ber_dupbv( &lc->lc_cred, &li->li_idassert_passwd );
 907                         }
 908                         LDAP_BACK_CONN_ISIDASSERT_SET( lc );
 909
 910                 } else {
 911                         BER_BVZERO( &lc->lc_cred );
 912                         BER_BVZERO( &lc->lc_bound_ndn );
 913                         if ( !BER_BVISEMPTY( &op->o_ndn )
 914                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 915                         {
 916                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 917                         }
 918                 }
 919
 920 #ifdef HAVE_TLS
 921                 /* if start TLS failed but it was not mandatory,
 922                  * check if the non-TLS connection was already
 923                  * in cache; in case, destroy the newly created
 924                  * connection and use the existing one */
 925                 if ( LDAP_BACK_PCONN_ISTLS( lc )
 926                                 && !ldap_tls_inplace( lc->lc_ld ) )
 927                 {
 928                         ldapconn_t      *tmplc = NULL;
 929                         int             idx = LDAP_BACK_CONN2PRIV( &lc_curr ) - 1;
 930
 931                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 932                         LDAP_TAILQ_FOREACH( tmplc,
 933                                 &li->li_conn_priv[ idx ].lic_priv,
 934                                 lc_q )
 935                         {
 936                                 if ( !LDAP_BACK_CONN_BINDING( tmplc ) ) {
 937                                         break;
 938                                 }
 939                         }
 940
 941                         if ( tmplc != NULL ) {
 942                                 refcnt = ++tmplc->lc_refcnt;
 943                                 ldap_back_conn_free( lc );
 944                                 lc = tmplc;
 945                         }
 946                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 947
 948                         if ( tmplc != NULL ) {
 949                                 goto done;
 950                         }
 951                 }
 952 #endif /* HAVE_TLS */
 953
 954                 /* Inserts the newly created ldapconn in the avl tree */
 955                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 956
 957                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 958
 959                 assert( lc->lc_refcnt == 1 );
 960
 961 #if LDAP_BACK_PRINT_CONNTREE > 0
 962                 ldap_back_print_conntree( li, ">>> ldap_back_getconn(insert)" );
 963 #endif /* LDAP_BACK_PRINT_CONNTREE */
 964
 965                 if ( LDAP_BACK_PCONN_ISPRIV( lc ) ) {
 966                         if ( li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_num < li->li_conn_priv_max ) {
 967                                 LDAP_TAILQ_INSERT_TAIL( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv, lc, lc_q );
 968                                 li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_num++;
 969                                 LDAP_BACK_CONN_CACHED_SET( lc );
 970
 971                         } else {
 972                                 LDAP_BACK_CONN_TAINTED_SET( lc );
 973                         }
 974                         rs->sr_err = 0;
 975
 976                 } else {
 977                         rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 978                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
 979                         LDAP_BACK_CONN_CACHED_SET( lc );
 980                 }
 981
 982 #if LDAP_BACK_PRINT_CONNTREE > 0
 983                 ldap_back_print_conntree( li, "<<< ldap_back_getconn(insert)" );
 984 #endif /* LDAP_BACK_PRINT_CONNTREE */
 985
 986                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 987
 988                 if ( StatslogTest( LDAP_DEBUG_TRACE ) ) {
 989                         char    buf[ SLAP_TEXT_BUFLEN ];
 990
 991                         snprintf( buf, sizeof( buf ),
 992                                 "lc=%p inserted refcnt=%u rc=%d",
 993                                 (void *)lc, refcnt, rs->sr_err );
 994
 995                         Debug( LDAP_DEBUG_TRACE,
 996                                 "=>ldap_back_getconn: %s: %s\n",
 997                                 op->o_log_prefix, buf, 0 );
 998                 }
 999
1000                 if ( !LDAP_BACK_PCONN_ISPRIV( lc ) ) {
1001                         /* Err could be -1 in case a duplicate ldapconn is inserted */
1002                         switch ( rs->sr_err ) {
1003                         case 0:
1004                                 break;
1005
1006                         case -1:
1007                                 LDAP_BACK_CONN_CACHED_CLEAR( lc );
1008                                 if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( li ) ) {
1009                                         /* duplicate: free and try to get the newly created one */
1010                                         ldap_back_conn_free( lc );
1011                                         lc = NULL;
1012                                         goto retry_lock;
1013                                 }
1014
1015                                 /* taint connection, so that it'll be freed when released */
1016                                 LDAP_BACK_CONN_TAINTED_SET( lc );
1017                                 break;
1018
1019                         default:
1020                                 LDAP_BACK_CONN_CACHED_CLEAR( lc );
1021                                 ldap_back_conn_free( lc );
1022                                 rs->sr_err = LDAP_OTHER;
1023                                 rs->sr_text = "Proxy bind collision";
1024                                 if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
1025                                         send_ldap_result( op, rs );
1026                                 }
1027                                 return NULL;
1028                         }
1029                 }
1030
1031         } else {
1032                 int     expiring = 0;
1033
1034                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
1035                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
1036                 {
1037                         expiring = 1;
1038
1039                         /* let it be used, but taint/delete it so that
1040                          * no-one else can look it up any further */
1041                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1042
1043 #if LDAP_BACK_PRINT_CONNTREE > 0
1044                         ldap_back_print_conntree( li, ">>> ldap_back_getconn(timeout)" );
1045 #endif /* LDAP_BACK_PRINT_CONNTREE */
1046
1047                         (void)ldap_back_conn_delete( li, lc );
1048                         LDAP_BACK_CONN_TAINTED_SET( lc );
1049
1050 #if LDAP_BACK_PRINT_CONNTREE > 0
1051                         ldap_back_print_conntree( li, "<<< ldap_back_getconn(timeout)" );
1052 #endif /* LDAP_BACK_PRINT_CONNTREE */
1053
1054                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1055                 }
1056
1057                 if ( StatslogTest( LDAP_DEBUG_TRACE ) ) {
1058                         char    buf[ SLAP_TEXT_BUFLEN ];
1059
1060                         snprintf( buf, sizeof( buf ),
1061                                 "conn %p fetched refcnt=%u%s",
1062                                 (void *)lc, refcnt,
1063                                 expiring ? " expiring" : "" );
1064                         Debug( LDAP_DEBUG_TRACE,
1065                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
1066                 }
1067         }
1068
1069 #ifdef HAVE_TLS
1070 done:;
1071 #endif /* HAVE_TLS */
1072
1073         return lc;
1074 }
1075
1076 void
1077 ldap_back_release_conn_lock(
1078         ldapinfo_t              *li,
1079         ldapconn_t              **lcp,
1080         int                     dolock )
1081 {
1082
1083         ldapconn_t      *lc = *lcp;
1084
1085         if ( dolock ) {
1086                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1087         }
1088         assert( lc->lc_refcnt > 0 );
1089         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1090         lc->lc_refcnt--;
1091         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
1092                 ldap_back_freeconn( li, lc, 0 );
1093                 *lcp = NULL;
1094         }
1095         if ( dolock ) {
1096                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1097         }
1098 }
1099
1100 void
1101 ldap_back_quarantine(
1102         Operation       *op,
1103         SlapReply       *rs )
1104 {
1105         ldapinfo_t              *li = (ldapinfo_t *)op->o_bd->be_private;
1106
1107         slap_retry_info_t       *ri = &li->li_quarantine;
1108
1109         ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
1110
1111         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1112                 time_t          new_last = slap_get_time();
1113
1114                 switch ( li->li_isquarantined ) {
1115                 case LDAP_BACK_FQ_NO:
1116                         if ( ri->ri_last == new_last ) {
1117                                 goto done;
1118                         }
1119
1120                         Debug( LDAP_DEBUG_ANY,
1121                                 "%s: ldap_back_quarantine enter.\n",
1122                                 op->o_log_prefix, 0, 0 );
1123
1124                         ri->ri_idx = 0;
1125                         ri->ri_count = 0;
1126                         break;
1127
1128                 case LDAP_BACK_FQ_RETRYING:
1129                         Debug( LDAP_DEBUG_ANY,
1130                                 "%s: ldap_back_quarantine block #%d try #%d failed.\n",
1131                                 op->o_log_prefix, ri->ri_idx, ri->ri_count );
1132
1133                         ++ri->ri_count;
1134                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
1135                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
1136                         {
1137                                 ri->ri_count = 0;
1138                                 ++ri->ri_idx;
1139                         }
1140                         break;
1141
1142                 default:
1143                         break;
1144                 }
1145
1146                 li->li_isquarantined = LDAP_BACK_FQ_YES;
1147                 ri->ri_last = new_last;
1148
1149         } else if ( li->li_isquarantined != LDAP_BACK_FQ_NO ) {
1150                 if ( ri->ri_last == slap_get_time() ) {
1151                         goto done;
1152                 }
1153
1154                 Debug( LDAP_DEBUG_ANY,
1155                         "%s: ldap_back_quarantine exit (%d) err=%d.\n",
1156                         op->o_log_prefix, li->li_isquarantined, rs->sr_err );
1157
1158                 if ( li->li_quarantine_f ) {
1159                         (void)li->li_quarantine_f( li, li->li_quarantine_p );
1160                 }
1161
1162                 ri->ri_count = 0;
1163                 ri->ri_idx = 0;
1164                 li->li_isquarantined = LDAP_BACK_FQ_NO;
1165         }
1166
1167 done:;
1168         ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
1169 }
1170
1171 /*
1172  * ldap_back_dobind_int
1173  *
1174  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
1175  */
1176 static int
1177 ldap_back_dobind_int(
1178         ldapconn_t              **lcp,
1179         Operation               *op,
1180         SlapReply               *rs,
1181         ldap_back_send_t        sendok,
1182         int                     retries,
1183         int                     dolock )
1184 {
1185         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1186
1187         ldapconn_t      *lc;
1188         struct berval   binddn = slap_empty_bv,
1189                         bindcred = slap_empty_bv;
1190
1191         int             rc = 0,
1192                         isbound,
1193                         binding = 0;
1194         ber_int_t       msgid;
1195
1196         assert( lcp != NULL );
1197         assert( retries >= 0 );
1198
1199         if ( sendok & LDAP_BACK_GETCONN ) {
1200                 assert( *lcp == NULL );
1201
1202                 lc = ldap_back_getconn( op, rs, sendok, &binddn, &bindcred );
1203                 if ( lc == NULL ) {
1204                         return 0;
1205                 }
1206                 *lcp = lc;
1207
1208         } else {
1209                 lc = *lcp;
1210         }
1211
1212         assert( lc != NULL );
1213
1214 retry_lock:;
1215         if ( dolock ) {
1216                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1217         }
1218
1219         if ( binding == 0 ) {
1220                 /* check if already bound */
1221                 rc = isbound = LDAP_BACK_CONN_ISBOUND( lc );
1222                 if ( isbound ) {
1223                         if ( dolock ) {
1224                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1225                         }
1226                         return rc;
1227                 }
1228
1229                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
1230                         /* if someone else is about to bind it, give up and retry */
1231                         if ( dolock ) {
1232                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1233                         }
1234                         ldap_pvt_thread_yield();
1235                         goto retry_lock;
1236
1237                 } else {
1238                         /* otherwise this thread will bind it */
1239                         LDAP_BACK_CONN_BINDING_SET( lc );
1240                         binding = 1;
1241                 }
1242         }
1243
1244         if ( dolock ) {
1245                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1246         }
1247
1248         /*
1249          * FIXME: we need to let clients use proxyAuthz
1250          * otherwise we cannot do symmetric pools of servers;
1251          * we have to live with the fact that a user can
1252          * authorize itself as any ID that is allowed
1253          * by the authzTo directive of the "proxyauthzdn".
1254          */
1255         /*
1256          * NOTE: current Proxy Authorization specification
1257          * and implementation do not allow proxy authorization
1258          * control to be provided with Bind requests
1259          */
1260         /*
1261          * if no bind took place yet, but the connection is bound
1262          * and the "idassert-authcDN" (or other ID) is set,
1263          * then bind as the asserting identity and explicitly
1264          * add the proxyAuthz control to every operation with the
1265          * dn bound to the connection as control value.
1266          * This is done also if this is the authrizing backend,
1267          * but the "override" flag is given to idassert.
1268          * It allows to use SASL bind and yet proxyAuthz users
1269          */
1270         if ( LDAP_BACK_CONN_ISIDASSERT( lc ) ) {
1271                 if ( BER_BVISEMPTY( &binddn ) && BER_BVISEMPTY( &bindcred ) ) {
1272                         /* if we got here, it shouldn't return result */
1273                         rc = ldap_back_is_proxy_authz( op, rs,
1274                                 LDAP_BACK_DONTSEND, &binddn, &bindcred );
1275                         assert( rc == 1 );
1276                 }
1277                 rc = ldap_back_proxy_authz_bind( lc, op, rs, sendok, &binddn, &bindcred );
1278                 goto done;
1279         }
1280
1281 #ifdef HAVE_CYRUS_SASL
1282         if ( LDAP_BACK_CONN_ISPRIV( lc )
1283                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
1284         {
1285                 void            *defaults = NULL;
1286
1287                 if ( li->li_acl_secprops != NULL ) {
1288                         rc = ldap_set_option( lc->lc_ld,
1289                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops );
1290
1291                         if ( rc != LDAP_OPT_SUCCESS ) {
1292                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
1293                                         "(SECPROPS,\"%s\") failed!\n",
1294                                         li->li_acl_secprops, 0, 0 );
1295                                 goto done;
1296                         }
1297                 }
1298
1299                 defaults = lutil_sasl_defaults( lc->lc_ld,
1300                                 li->li_acl_sasl_mech.bv_val,
1301                                 li->li_acl_sasl_realm.bv_val,
1302                                 li->li_acl_authcID.bv_val,
1303                                 li->li_acl_passwd.bv_val,
1304                                 NULL );
1305
1306                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
1307                                 li->li_acl_authcDN.bv_val,
1308                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
1309                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1310                                 defaults );
1311
1312                 lutil_sasl_freedefs( defaults );
1313
1314                 switch ( rs->sr_err ) {
1315                 case LDAP_SUCCESS:
1316                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1317                         break;
1318
1319                 case LDAP_LOCAL_ERROR:
1320                         /* list client API error codes that require
1321                          * to taint the connection */
1322                         /* FIXME: should actually retry? */
1323                         LDAP_BACK_CONN_TAINTED_SET( lc );
1324
1325                         /* fallthru */
1326
1327                 default:
1328                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1329                         rs->sr_err = slap_map_api2result( rs );
1330                         if ( sendok & LDAP_BACK_SENDERR ) {
1331                                 send_ldap_result( op, rs );
1332                         }
1333                         break;
1334                 }
1335
1336                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1337                         ldap_back_quarantine( op, rs );
1338                 }
1339
1340                 goto done;
1341         }
1342 #endif /* HAVE_CYRUS_SASL */
1343
1344 retry:;
1345         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1346                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1347                         LDAP_SASL_SIMPLE, &lc->lc_cred,
1348                         NULL, NULL, &msgid );
1349
1350         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
1351                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
1352                         if ( dolock ) {
1353                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1354                         }
1355
1356                         assert( lc->lc_refcnt > 0 );
1357                         if ( lc->lc_refcnt == 1 ) {
1358                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
1359                                 lc->lc_ld = NULL;
1360
1361                                 /* lc here must be the regular lc, reset and ready for init */
1362                                 rs->sr_err = ldap_back_prepare_conn( lc, op, rs, sendok );
1363                                 if ( rs->sr_err != LDAP_SUCCESS ) {
1364                                         sendok &= ~LDAP_BACK_SENDERR;
1365                                         lc->lc_refcnt = 0;
1366                                 }
1367                         }
1368
1369                         if ( dolock ) {
1370                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1371                         }
1372
1373                         if ( rs->sr_err == LDAP_SUCCESS ) {
1374                                 if ( retries > 0 ) {
1375                                         retries--;
1376                                 }
1377                                 goto retry;
1378                         }
1379                 }
1380
1381                 assert( lc->lc_refcnt == 1 );
1382                 lc->lc_refcnt = 0;
1383                 ldap_back_freeconn( li, lc, dolock );
1384                 *lcp = NULL;
1385                 rs->sr_err = slap_map_api2result( rs );
1386
1387                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1388                         ldap_back_quarantine( op, rs );
1389                 }
1390
1391                 if ( rs->sr_err != LDAP_SUCCESS &&
1392                         ( sendok & LDAP_BACK_SENDERR ) )
1393                 {
1394                         rs->sr_text = "Internal proxy bind failure";
1395                         send_ldap_result( op, rs );
1396                 }
1397
1398                 return 0;
1399         }
1400
1401         rc = ldap_back_op_result( lc, op, rs, msgid,
1402                 -1, ( sendok | LDAP_BACK_BINDING ) );
1403         if ( rc == LDAP_SUCCESS ) {
1404                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1405         }
1406
1407 done:;
1408         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1409         rc = LDAP_BACK_CONN_ISBOUND( lc );
1410         if ( !rc ) {
1411                 ldap_back_release_conn_lock( li, lcp, dolock );
1412
1413         } else if ( LDAP_BACK_SAVECRED( li ) ) {
1414                 ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
1415         }
1416
1417         return rc;
1418 }
1419
1420 /*
1421  * ldap_back_dobind
1422  *
1423  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
1424  */
1425 int
1426 ldap_back_dobind( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1427 {
1428         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1429
1430         return ldap_back_dobind_int( lcp, op, rs,
1431                 ( sendok | LDAP_BACK_GETCONN ), li->li_nretries, 1 );
1432 }
1433
1434 /*
1435  * ldap_back_default_rebind
1436  *
1437  * This is a callback used for chasing referrals using the same
1438  * credentials as the original user on this session.
1439  */
1440 int
1441 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1442         ber_int_t msgid, void *params )
1443 {
1444         ldapconn_t      *lc = (ldapconn_t *)params;
1445
1446 #ifdef HAVE_TLS
1447         /* ... otherwise we couldn't get here */
1448         assert( lc != NULL );
1449
1450         if ( !ldap_tls_inplace( ld ) ) {
1451                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1452                                 rc;
1453                 const char      *text = NULL;
1454
1455                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1456                         LDAP_BACK_RETRY_DEFAULT, &text );
1457                 if ( rc != LDAP_SUCCESS ) {
1458                         return rc;
1459                 }
1460         }
1461 #endif /* HAVE_TLS */
1462
1463         /* FIXME: add checks on the URL/identity? */
1464
1465         return ldap_sasl_bind_s( ld,
1466                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1467                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1468 }
1469
1470 int
1471 ldap_back_cancel(
1472                 ldapconn_t              *lc,
1473                 Operation               *op,
1474                 SlapReply               *rs,
1475                 ber_int_t               msgid,
1476                 ldap_back_send_t        sendok )
1477 {
1478         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1479
1480         /* default behavior */
1481         if ( LDAP_BACK_ABANDON( li ) ) {
1482                 return ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1483         }
1484
1485         if ( LDAP_BACK_CANCEL( li ) ) {
1486                 /* FIXME: asynchronous? */
1487                 return ldap_cancel_s( lc->lc_ld, msgid, NULL, NULL );
1488         }
1489
1490         assert( 0 );
1491
1492         return LDAP_OTHER;
1493 }
1494
1495 int
1496 ldap_back_op_result(
1497                 ldapconn_t              *lc,
1498                 Operation               *op,
1499                 SlapReply               *rs,
1500                 ber_int_t               msgid,
1501                 time_t                  timeout,
1502                 ldap_back_send_t        sendok )
1503 {
1504         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1505
1506         char            *match = NULL;
1507         char            *text = NULL;
1508         char            **refs = NULL;
1509         LDAPControl     **ctrls = NULL;
1510
1511 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1512
1513         rs->sr_text = NULL;
1514         rs->sr_matched = NULL;
1515         rs->sr_ref = NULL;
1516         rs->sr_ctrls = NULL;
1517
1518         /* if the error recorded in the reply corresponds
1519          * to a successful state, get the error from the
1520          * remote server response */
1521         if ( ERR_OK( rs->sr_err ) ) {
1522                 int             rc;
1523                 struct timeval  tv;
1524                 LDAPMessage     *res = NULL;
1525                 time_t          stoptime = (time_t)(-1);
1526                 int             timeout_err = op->o_protocol >= LDAP_VERSION3 ?
1527                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OTHER;
1528                 const char      *timeout_text = "Operation timed out";
1529
1530                 /* if timeout is not specified, compute and use
1531                  * the one specific to the ongoing operation */
1532                 if ( timeout == (time_t)(-1) ) {
1533                         slap_op_t       opidx = slap_req2op( op->o_tag );
1534
1535                         if ( opidx == SLAP_OP_SEARCH ) {
1536                                 if ( op->ors_tlimit <= 0 ) {
1537                                         timeout = 0;
1538
1539                                 } else {
1540                                         timeout = op->ors_tlimit;
1541                                         timeout_err = LDAP_TIMELIMIT_EXCEEDED;
1542                                         timeout_text = NULL;
1543                                 }
1544
1545                         } else {
1546                                 timeout = li->li_timeout[ opidx ];
1547                         }
1548                 }
1549
1550                 /* better than nothing :) */
1551                 if ( timeout == 0 ) {
1552                         if ( li->li_idle_timeout ) {
1553                                 timeout = li->li_idle_timeout;
1554
1555                         } else if ( li->li_conn_ttl ) {
1556                                 timeout = li->li_conn_ttl;
1557                         }
1558                 }
1559
1560                 if ( timeout ) {
1561                         stoptime = op->o_time + timeout;
1562                 }
1563
1564                 LDAP_BACK_TV_SET( &tv );
1565
1566 retry:;
1567                 /* if result parsing fails, note the failure reason */
1568                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1569                 switch ( rc ) {
1570                 case 0:
1571                         if ( timeout && slap_get_time() > stoptime ) {
1572                                 if ( sendok & LDAP_BACK_BINDING ) {
1573                                         ldap_unbind_ext( lc->lc_ld, NULL, NULL );
1574                                         lc->lc_ld = NULL;
1575
1576                                         /* let it be used, but taint/delete it so that
1577                                          * no-one else can look it up any further */
1578                                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1579
1580 #if LDAP_BACK_PRINT_CONNTREE > 0
1581                                         ldap_back_print_conntree( li, ">>> ldap_back_getconn(timeout)" );
1582 #endif /* LDAP_BACK_PRINT_CONNTREE */
1583
1584                                         (void)ldap_back_conn_delete( li, lc );
1585                                         LDAP_BACK_CONN_TAINTED_SET( lc );
1586
1587 #if LDAP_BACK_PRINT_CONNTREE > 0
1588                                         ldap_back_print_conntree( li, "<<< ldap_back_getconn(timeout)" );
1589 #endif /* LDAP_BACK_PRINT_CONNTREE */
1590                                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1591
1592                                 } else {
1593                                         (void)ldap_back_cancel( lc, op, rs, msgid, sendok );
1594                                 }
1595                                 rs->sr_err = timeout_err;
1596                                 rs->sr_text = timeout_text;
1597                                 break;
1598                         }
1599
1600                         /* timeout == 0 */
1601                         LDAP_BACK_TV_SET( &tv );
1602                         ldap_pvt_thread_yield();
1603                         goto retry;
1604
1605                 case -1:
1606                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1607                                         &rs->sr_err );
1608                         break;
1609
1610
1611                 /* otherwise get the result; if it is not
1612                  * LDAP_SUCCESS, record it in the reply
1613                  * structure (this includes
1614                  * LDAP_COMPARE_{TRUE|FALSE}) */
1615                 default:
1616                         /* only touch when activity actually took place... */
1617                         if ( li->li_idle_timeout && lc ) {
1618                                 lc->lc_time = op->o_time;
1619                         }
1620
1621                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1622                                         &match, &text, &refs, &ctrls, 1 );
1623                         rs->sr_text = text;
1624                         if ( rc != LDAP_SUCCESS ) {
1625                                 rs->sr_err = rc;
1626                         }
1627
1628                         /* RFC 4511: referrals can only appear
1629                          * if result code is LDAP_REFERRAL */
1630                         if ( refs != NULL
1631                                 && refs[ 0 ] != NULL
1632                                 && refs[ 0 ][ 0 ] != '\0' )
1633                         {
1634                                 if ( rs->sr_err != LDAP_REFERRAL ) {
1635                                         Debug( LDAP_DEBUG_ANY,
1636                                                 "%s ldap_back_op_result: "
1637                                                 "got referrals with err=%d\n",
1638                                                 op->o_log_prefix,
1639                                                 rs->sr_err, 0 );
1640
1641                                 } else {
1642                                         int     i;
1643
1644                                         for ( i = 0; refs[ i ] != NULL; i++ )
1645                                                 /* count */ ;
1646                                         rs->sr_ref = op->o_tmpalloc( sizeof( struct berval ) * ( i + 1 ),
1647                                                 op->o_tmpmemctx );
1648                                         for ( i = 0; refs[ i ] != NULL; i++ ) {
1649                                                 ber_str2bv( refs[ i ], 0, 0, &rs->sr_ref[ i ] );
1650                                         }
1651                                         BER_BVZERO( &rs->sr_ref[ i ] );
1652                                 }
1653
1654                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
1655                                 Debug( LDAP_DEBUG_ANY,
1656                                         "%s ldap_back_op_result: "
1657                                         "got err=%d with null "
1658                                         "or empty referrals\n",
1659                                         op->o_log_prefix,
1660                                         rs->sr_err, 0 );
1661
1662                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1663                         }
1664
1665                         if ( ctrls != NULL ) {
1666                                 rs->sr_ctrls = ctrls;
1667                         }
1668                 }
1669         }
1670
1671         /* if the error in the reply structure is not
1672          * LDAP_SUCCESS, try to map it from client
1673          * to server error */
1674         if ( !ERR_OK( rs->sr_err ) ) {
1675                 rs->sr_err = slap_map_api2result( rs );
1676
1677                 /* internal ops ( op->o_conn == NULL )
1678                  * must not reply to client */
1679                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1680
1681                         /* record the (massaged) matched
1682                          * DN into the reply structure */
1683                         rs->sr_matched = match;
1684                 }
1685         }
1686
1687         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1688                 if ( !( sendok & LDAP_BACK_RETRYING ) ) {
1689                         if ( LDAP_BACK_QUARANTINE( li ) ) {
1690                                 ldap_back_quarantine( op, rs );
1691                         }
1692                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
1693                                 if ( rs->sr_text == NULL ) rs->sr_text = "Proxy operation retry failed";
1694                                 send_ldap_result( op, rs );
1695                         }
1696                 }
1697
1698         } else if ( op->o_conn &&
1699                 ( ( ( sendok & LDAP_BACK_SENDOK ) && ERR_OK( rs->sr_err ) )
1700                         || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1701         {
1702                 send_ldap_result( op, rs );
1703         }
1704
1705         if ( match ) {
1706                 if ( rs->sr_matched != match ) {
1707                         free( (char *)rs->sr_matched );
1708                 }
1709                 rs->sr_matched = NULL;
1710                 ldap_memfree( match );
1711         }
1712
1713         if ( text ) {
1714                 ldap_memfree( text );
1715         }
1716         rs->sr_text = NULL;
1717
1718         if ( rs->sr_ref ) {
1719                 op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
1720                 rs->sr_ref = NULL;
1721         }
1722
1723         if ( refs ) {
1724                 ber_memvfree( (void **)refs );
1725         }
1726
1727         if ( ctrls ) {
1728                 assert( rs->sr_ctrls != NULL );
1729                 ldap_controls_free( ctrls );
1730                 rs->sr_ctrls = NULL;
1731         }
1732
1733         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1734 }
1735
1736 /* return true if bound, false if failed */
1737 int
1738 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1739 {
1740         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1741         int             rc = 0;
1742
1743         assert( lcp != NULL );
1744         assert( *lcp != NULL );
1745
1746         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1747
1748         if ( (*lcp)->lc_refcnt == 1 ) {
1749                 int binding = LDAP_BACK_CONN_BINDING( *lcp );
1750
1751                 ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1752                 Debug( LDAP_DEBUG_ANY,
1753                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1754                         op->o_log_prefix, li->li_uri,
1755                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1756                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1757                 ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1758
1759                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1760                 (*lcp)->lc_ld = NULL;
1761                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1762
1763                 /* lc here must be the regular lc, reset and ready for init */
1764                 rc = ldap_back_prepare_conn( *lcp, op, rs, sendok );
1765                 if ( rc != LDAP_SUCCESS ) {
1766                         /* freeit, because lc_refcnt == 1 */
1767                         (*lcp)->lc_refcnt = 0;
1768                         (void)ldap_back_freeconn( li, *lcp, 0 );
1769                         *lcp = NULL;
1770                         rc = 0;
1771
1772                 } else if ( ( sendok & LDAP_BACK_BINDING ) ) {
1773                         if ( binding ) {
1774                                 LDAP_BACK_CONN_BINDING_SET( *lcp );
1775                         }
1776                         rc = 1;
1777
1778                 } else {
1779                         rc = ldap_back_dobind_int( lcp, op, rs, sendok, 0, 0 );
1780                         if ( rc == 0 && *lcp != NULL ) {
1781                                 /* freeit, because lc_refcnt == 1 */
1782                                 (*lcp)->lc_refcnt = 0;
1783                                 LDAP_BACK_CONN_TAINTED_SET( *lcp );
1784                                 (void)ldap_back_freeconn( li, *lcp, 0 );
1785                                 *lcp = NULL;
1786                         }
1787                 }
1788
1789         } else {
1790                 Debug( LDAP_DEBUG_TRACE,
1791                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1792                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1793
1794                 LDAP_BACK_CONN_TAINTED_SET( *lcp );
1795                 ldap_back_release_conn_lock( li, lcp, 0 );
1796                 assert( *lcp == NULL );
1797
1798                 if ( sendok & LDAP_BACK_SENDERR ) {
1799                         rs->sr_err = LDAP_UNAVAILABLE;
1800                         rs->sr_text = "Unable to retry";
1801                         send_ldap_result( op, rs );
1802                 }
1803         }
1804
1805         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1806
1807         return rc;
1808 }
1809
1810 static int
1811 ldap_back_is_proxy_authz( Operation *op, SlapReply *rs, ldap_back_send_t sendok,
1812         struct berval *binddn, struct berval *bindcred )
1813 {
1814         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1815         struct berval   ndn;
1816         int             dobind = 0;
1817
1818         if ( op->o_conn == NULL || op->o_do_not_cache ) {
1819                 goto done;
1820         }
1821
1822         /* don't proxyAuthz if protocol is not LDAPv3 */
1823         switch ( li->li_version ) {
1824         case LDAP_VERSION3:
1825                 break;
1826
1827         case 0:
1828                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1829                         break;
1830                 }
1831                 /* fall thru */
1832
1833         default:
1834                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1835                 if ( sendok & LDAP_BACK_SENDERR ) {
1836                         send_ldap_result( op, rs );
1837                         dobind = -1;
1838                 }
1839                 goto done;
1840         }
1841
1842         /* safe default */
1843         *binddn = slap_empty_bv;
1844         *bindcred = slap_empty_bv;
1845
1846         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1847                 ndn = op->o_conn->c_ndn;
1848
1849         } else {
1850                 ndn = op->o_ndn;
1851         }
1852
1853         switch ( li->li_idassert_mode ) {
1854         case LDAP_BACK_IDASSERT_LEGACY:
1855                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1856                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1857                         {
1858                                 *binddn = li->li_idassert_authcDN;
1859                                 *bindcred = li->li_idassert_passwd;
1860                                 dobind = 1;
1861                         }
1862                 }
1863                 break;
1864
1865         default:
1866                 /* NOTE: rootdn can always idassert */
1867                 if ( BER_BVISNULL( &ndn )
1868                         && li->li_idassert_authz == NULL
1869                         && !( li->li_idassert_flags & LDAP_BACK_AUTH_AUTHZ_ALL ) )
1870                 {
1871                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1872                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1873                                 if ( sendok & LDAP_BACK_SENDERR ) {
1874                                         send_ldap_result( op, rs );
1875                                         dobind = -1;
1876                                 }
1877
1878                         } else {
1879                                 rs->sr_err = LDAP_SUCCESS;
1880                                 *binddn = slap_empty_bv;
1881                                 *bindcred = slap_empty_bv;
1882                                 break;
1883                         }
1884
1885                         goto done;
1886
1887                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1888                         struct berval authcDN;
1889
1890                         if ( BER_BVISNULL( &ndn ) ) {
1891                                 authcDN = slap_empty_bv;
1892
1893                         } else {
1894                                 authcDN = ndn;
1895                         }
1896                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1897                                         &authcDN, &authcDN );
1898                         if ( rs->sr_err != LDAP_SUCCESS ) {
1899                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1900                                         if ( sendok & LDAP_BACK_SENDERR ) {
1901                                                 send_ldap_result( op, rs );
1902                                                 dobind = -1;
1903                                         }
1904
1905                                 } else {
1906                                         rs->sr_err = LDAP_SUCCESS;
1907                                         *binddn = slap_empty_bv;
1908                                         *bindcred = slap_empty_bv;
1909                                         break;
1910                                 }
1911
1912                                 goto done;
1913                         }
1914                 }
1915
1916                 *binddn = li->li_idassert_authcDN;
1917                 *bindcred = li->li_idassert_passwd;
1918                 dobind = 1;
1919                 break;
1920         }
1921
1922 done:;
1923         return dobind;
1924 }
1925
1926 static int
1927 ldap_back_proxy_authz_bind(
1928         ldapconn_t              *lc,
1929         Operation               *op,
1930         SlapReply               *rs,
1931         ldap_back_send_t        sendok,
1932         struct berval           *binddn,
1933         struct berval           *bindcred )
1934 {
1935         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1936         struct berval   ndn;
1937         int             msgid;
1938         int             rc;
1939
1940         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1941                 ndn = op->o_conn->c_ndn;
1942
1943         } else {
1944                 ndn = op->o_ndn;
1945         }
1946
1947         if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1948 #ifdef HAVE_CYRUS_SASL
1949                 void            *defaults = NULL;
1950                 struct berval   authzID = BER_BVNULL;
1951                 int             freeauthz = 0;
1952
1953                 /* if SASL supports native authz, prepare for it */
1954                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1955                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1956                 {
1957                         switch ( li->li_idassert_mode ) {
1958                         case LDAP_BACK_IDASSERT_OTHERID:
1959                         case LDAP_BACK_IDASSERT_OTHERDN:
1960                                 authzID = li->li_idassert_authzID;
1961                                 break;
1962
1963                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1964                                 BER_BVSTR( &authzID, "dn:" );
1965                                 break;
1966
1967                         case LDAP_BACK_IDASSERT_SELF:
1968                                 if ( BER_BVISNULL( &ndn ) ) {
1969                                         /* connection is not authc'd, so don't idassert */
1970                                         BER_BVSTR( &authzID, "dn:" );
1971                                         break;
1972                                 }
1973                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1974                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1975                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1976                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1977                                                 ndn.bv_val, ndn.bv_len + 1 );
1978                                 freeauthz = 1;
1979                                 break;
1980
1981                         default:
1982                                 break;
1983                         }
1984                 }
1985
1986                 if ( li->li_idassert_secprops != NULL ) {
1987                         rs->sr_err = ldap_set_option( lc->lc_ld,
1988                                 LDAP_OPT_X_SASL_SECPROPS,
1989                                 (void *)li->li_idassert_secprops );
1990
1991                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1992                                 rs->sr_err = LDAP_OTHER;
1993                                 if ( sendok & LDAP_BACK_SENDERR ) {
1994                                         send_ldap_result( op, rs );
1995                                 }
1996                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1997                                 goto done;
1998                         }
1999                 }
2000
2001                 defaults = lutil_sasl_defaults( lc->lc_ld,
2002                                 li->li_idassert_sasl_mech.bv_val,
2003                                 li->li_idassert_sasl_realm.bv_val,
2004                                 li->li_idassert_authcID.bv_val,
2005                                 li->li_idassert_passwd.bv_val,
2006                                 authzID.bv_val );
2007
2008                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn->bv_val,
2009                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
2010                                 LDAP_SASL_QUIET, lutil_sasl_interact,
2011                                 defaults );
2012
2013                 switch ( rs->sr_err ) {
2014                 case LDAP_SUCCESS:
2015                         LDAP_BACK_CONN_ISBOUND_SET( lc );
2016                         break;
2017
2018                 case LDAP_LOCAL_ERROR:
2019                         /* list client API error codes that require
2020                          * to taint the connection */
2021                         /* FIXME: should actually retry? */
2022                         LDAP_BACK_CONN_TAINTED_SET( lc );
2023
2024                         /* fallthru */
2025
2026                 default:
2027                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
2028                         rs->sr_err = slap_map_api2result( rs );
2029                         if ( sendok & LDAP_BACK_SENDERR ) {
2030                                 send_ldap_result( op, rs );
2031                         }
2032                         break;
2033                 }
2034
2035                 lutil_sasl_freedefs( defaults );
2036                 if ( freeauthz ) {
2037                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
2038                 }
2039
2040                 goto done;
2041 #endif /* HAVE_CYRUS_SASL */
2042         }
2043
2044         switch ( li->li_idassert_authmethod ) {
2045         case LDAP_AUTH_NONE:
2046                 /* FIXME: do we really need this? */
2047                 BER_BVSTR( binddn, "" );
2048                 BER_BVSTR( bindcred, "" );
2049                 /* fallthru */
2050
2051         case LDAP_AUTH_SIMPLE:
2052                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
2053                                 binddn->bv_val, LDAP_SASL_SIMPLE,
2054                                 bindcred, NULL, NULL, &msgid );
2055                 rc = ldap_back_op_result( lc, op, rs, msgid,
2056                         -1, ( sendok | LDAP_BACK_BINDING ) );
2057                 break;
2058
2059         default:
2060                 /* unsupported! */
2061                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
2062                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
2063                 if ( sendok & LDAP_BACK_SENDERR ) {
2064                         send_ldap_result( op, rs );
2065                 }
2066                 goto done;
2067         }
2068
2069         if ( rc == LDAP_SUCCESS ) {
2070                 /* set rebind stuff in case of successful proxyAuthz bind,
2071                  * so that referral chasing is attempted using the right
2072                  * identity */
2073                 LDAP_BACK_CONN_ISBOUND_SET( lc );
2074                 ber_bvreplace( &lc->lc_bound_ndn, binddn );
2075
2076                 if ( !BER_BVISNULL( &lc->lc_cred ) ) {
2077                         memset( lc->lc_cred.bv_val, 0,
2078                                         lc->lc_cred.bv_len );
2079                 }
2080
2081                 if ( LDAP_BACK_SAVECRED( li ) ) {
2082                         ber_bvreplace( &lc->lc_cred, bindcred );
2083                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
2084
2085                 } else {
2086                         lc->lc_cred.bv_len = 0;
2087                 }
2088         }
2089 done:;
2090         return LDAP_BACK_CONN_ISBOUND( lc );
2091 }
2092
2093 /*
2094  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
2095  * to existing server-side controls if required; if not,
2096  * the existing server-side controls are placed in *pctrls.
2097  * The caller, after using the controls in client API
2098  * operations, if ( *pctrls != op->o_ctrls ), should
2099  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
2100  * The function returns success if the control could
2101  * be added if required, or if it did nothing; in the future,
2102  * it might return some error if it failed.
2103  *
2104  * if no bind took place yet, but the connection is bound
2105  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
2106  * and explicitly add proxyAuthz the control to every operation
2107  * with the dn bound to the connection as control value.
2108  *
2109  * If no server-side controls are defined for the operation,
2110  * simply add the proxyAuthz control; otherwise, if the
2111  * proxyAuthz control is not already set, add it as
2112  * the first one
2113  *
2114  * FIXME: is controls order significant for security?
2115  * ANSWER: controls ordering and interoperability
2116  * must be indicated by the specs of each control; if none
2117  * is specified, the order is irrelevant.
2118  */
2119 int
2120 ldap_back_proxy_authz_ctrl(
2121                 struct berval   *bound_ndn,
2122                 int             version,
2123                 slap_idassert_t *si,
2124                 Operation       *op,
2125                 SlapReply       *rs,
2126                 LDAPControl     ***pctrls )
2127 {
2128         LDAPControl             **ctrls = NULL;
2129         int                     i = 0;
2130         slap_idassert_mode_t    mode;
2131         struct berval           assertedID,
2132                                 ndn;
2133         int                     isroot = 0;
2134
2135         *pctrls = NULL;
2136
2137         rs->sr_err = LDAP_SUCCESS;
2138
2139         /* don't proxyAuthz if protocol is not LDAPv3 */
2140         switch ( version ) {
2141         case LDAP_VERSION3:
2142                 break;
2143
2144         case 0:
2145                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
2146                         break;
2147                 }
2148                 /* fall thru */
2149
2150         default:
2151                 goto done;
2152         }
2153
2154         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
2155          * but if it is not set this test fails.  We need a different
2156          * means to detect if idassert is enabled */
2157         if ( ( BER_BVISNULL( &si->si_bc.sb_authcId ) || BER_BVISEMPTY( &si->si_bc.sb_authcId ) )
2158                 && ( BER_BVISNULL( &si->si_bc.sb_binddn ) || BER_BVISEMPTY( &si->si_bc.sb_binddn ) )
2159                 && BER_BVISNULL( &si->si_bc.sb_saslmech ) )
2160         {
2161                 goto done;
2162         }
2163
2164         if ( !op->o_conn || op->o_do_not_cache || ( isroot = be_isroot( op ) ) ) {
2165                 goto done;
2166         }
2167
2168         if ( op->o_tag == LDAP_REQ_BIND ) {
2169                 ndn = op->o_req_ndn;
2170
2171         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
2172                 ndn = op->o_conn->c_ndn;
2173
2174         } else {
2175                 ndn = op->o_ndn;
2176         }
2177
2178         if ( si->si_mode == LDAP_BACK_IDASSERT_LEGACY ) {
2179                 if ( op->o_proxy_authz ) {
2180                         /*
2181                          * FIXME: we do not want to perform proxyAuthz
2182                          * on behalf of the client, because this would
2183                          * be performed with "proxyauthzdn" privileges.
2184                          *
2185                          * This might actually be too strict, since
2186                          * the "proxyauthzdn" authzTo, and each entry's
2187                          * authzFrom attributes may be crafted
2188                          * to avoid unwanted proxyAuthz to take place.
2189                          */
2190 #if 0
2191                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2192                         rs->sr_text = "proxyAuthz not allowed within namingContext";
2193 #endif
2194                         goto done;
2195                 }
2196
2197                 if ( !BER_BVISNULL( bound_ndn ) ) {
2198                         goto done;
2199                 }
2200
2201                 if ( BER_BVISNULL( &ndn ) ) {
2202                         goto done;
2203                 }
2204
2205                 if ( BER_BVISNULL( &si->si_bc.sb_binddn ) ) {
2206                         goto done;
2207                 }
2208
2209         } else if ( si->si_bc.sb_method == LDAP_AUTH_SASL ) {
2210                 if ( ( si->si_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
2211                 {
2212                         /* already asserted in SASL via native authz */
2213                         goto done;
2214                 }
2215
2216         } else if ( si->si_authz && !isroot ) {
2217                 int             rc;
2218                 struct berval authcDN;
2219
2220                 if ( BER_BVISNULL( &ndn ) ) {
2221                         authcDN = slap_empty_bv;
2222                 } else {
2223                         authcDN = ndn;
2224                 }
2225                 rc = slap_sasl_matches( op, si->si_authz,
2226                                 &authcDN, & authcDN );
2227                 if ( rc != LDAP_SUCCESS ) {
2228                         if ( si->si_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
2229                                 /* ndn is not authorized
2230                                  * to use idassert */
2231                                 rs->sr_err = rc;
2232                         }
2233                         goto done;
2234                 }
2235         }
2236
2237         if ( op->o_proxy_authz ) {
2238                 /*
2239                  * FIXME: we can:
2240                  * 1) ignore the already set proxyAuthz control
2241                  * 2) leave it in place, and don't set ours
2242                  * 3) add both
2243                  * 4) reject the operation
2244                  *
2245                  * option (4) is very drastic
2246                  * option (3) will make the remote server reject
2247                  * the operation, thus being equivalent to (4)
2248                  * option (2) will likely break the idassert
2249                  * assumptions, so we cannot accept it;
2250                  * option (1) means that we are contradicting
2251                  * the client's reques.
2252                  *
2253                  * I think (4) is the only correct choice.
2254                  */
2255                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2256                 rs->sr_text = "proxyAuthz not allowed within namingContext";
2257         }
2258
2259         if ( op->o_is_auth_check ) {
2260                 mode = LDAP_BACK_IDASSERT_NOASSERT;
2261
2262         } else {
2263                 mode = si->si_mode;
2264         }
2265
2266         switch ( mode ) {
2267         case LDAP_BACK_IDASSERT_LEGACY:
2268                 /* original behavior:
2269                  * assert the client's identity */
2270         case LDAP_BACK_IDASSERT_SELF:
2271                 assertedID = ndn;
2272                 break;
2273
2274         case LDAP_BACK_IDASSERT_ANONYMOUS:
2275                 /* assert "anonymous" */
2276                 assertedID = slap_empty_bv;
2277                 break;
2278
2279         case LDAP_BACK_IDASSERT_NOASSERT:
2280                 /* don't assert; bind as proxyauthzdn */
2281                 goto done;
2282
2283         case LDAP_BACK_IDASSERT_OTHERID:
2284         case LDAP_BACK_IDASSERT_OTHERDN:
2285                 /* assert idassert DN */
2286                 assertedID = si->si_bc.sb_authzId;
2287                 break;
2288
2289         default:
2290                 assert( 0 );
2291         }
2292
2293         /* if we got here, "" is allowed to proxyAuthz */
2294         if ( BER_BVISNULL( &assertedID ) ) {
2295                 assertedID = slap_empty_bv;
2296         }
2297
2298         /* don't idassert the bound DN (ITS#4497) */
2299         if ( dn_match( &assertedID, bound_ndn ) ) {
2300                 goto done;
2301         }
2302
2303         if ( op->o_ctrls ) {
2304                 for ( i = 0; op->o_ctrls[ i ]; i++ )
2305                         /* just count ctrls */ ;
2306         }
2307
2308         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
2309                         op->o_tmpmemctx );
2310         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
2311
2312         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
2313         ctrls[ 0 ]->ldctl_iscritical = 1;
2314
2315         switch ( si->si_mode ) {
2316         /* already in u:ID or dn:DN form */
2317         case LDAP_BACK_IDASSERT_OTHERID:
2318         case LDAP_BACK_IDASSERT_OTHERDN:
2319                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
2320                 break;
2321
2322         /* needs the dn: prefix */
2323         default:
2324                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
2325                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
2326                                 op->o_tmpmemctx );
2327                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
2328                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
2329                                 assertedID.bv_val, assertedID.bv_len + 1 );
2330                 break;
2331         }
2332
2333         /* Older versions of <draft-weltman-ldapv3-proxy> required
2334          * to encode the value of the authzID (and called it proxyDN);
2335          * this hack provides compatibility with those DSAs that
2336          * implement it this way */
2337         if ( si->si_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
2338                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
2339                 BerElementBuffer        berbuf;
2340                 BerElement              *ber = (BerElement *)&berbuf;
2341                 ber_tag_t               tag;
2342
2343                 ber_init2( ber, 0, LBER_USE_DER );
2344                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
2345
2346                 tag = ber_printf( ber, "O", &authzID );
2347                 if ( tag == LBER_ERROR ) {
2348                         rs->sr_err = LDAP_OTHER;
2349                         goto free_ber;
2350                 }
2351
2352                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
2353                         rs->sr_err = LDAP_OTHER;
2354                         goto free_ber;
2355                 }
2356
2357 free_ber:;
2358                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
2359                 ber_free_buf( ber );
2360
2361                 if ( rs->sr_err != LDAP_SUCCESS ) {
2362                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2363                         ctrls = NULL;
2364                         goto done;
2365                 }
2366
2367         } else if ( si->si_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
2368                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
2369                                         tmp;
2370                 BerElementBuffer        berbuf;
2371                 BerElement              *ber = (BerElement *)&berbuf;
2372                 ber_tag_t               tag;
2373
2374                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
2375                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2376                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2377                         ctrls = NULL;
2378                         rs->sr_err = LDAP_PROTOCOL_ERROR;
2379                         goto done;
2380                 }
2381
2382                 tmp = authzID;
2383                 tmp.bv_val += STRLENOF( "dn:" );
2384                 tmp.bv_len -= STRLENOF( "dn:" );
2385
2386                 ber_init2( ber, 0, LBER_USE_DER );
2387                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
2388
2389                 /* apparently, Mozilla API encodes this
2390                  * as "SEQUENCE { LDAPDN }" */
2391                 tag = ber_printf( ber, "{O}", &tmp );
2392                 if ( tag == LBER_ERROR ) {
2393                         rs->sr_err = LDAP_OTHER;
2394                         goto free_ber2;
2395                 }
2396
2397                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
2398                         rs->sr_err = LDAP_OTHER;
2399                         goto free_ber2;
2400                 }
2401
2402 free_ber2:;
2403                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
2404                 ber_free_buf( ber );
2405
2406                 if ( rs->sr_err != LDAP_SUCCESS ) {
2407                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2408                         ctrls = NULL;
2409                         goto done;
2410                 }
2411
2412                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
2413         }
2414
2415         if ( op->o_ctrls ) {
2416                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
2417                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
2418                 }
2419         }
2420         ctrls[ i + 1 ] = NULL;
2421
2422 done:;
2423         if ( ctrls == NULL ) {
2424                 ctrls = op->o_ctrls;
2425         }
2426
2427         *pctrls = ctrls;
2428
2429         return rs->sr_err;
2430 }
2431
2432 int
2433 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
2434 {
2435         LDAPControl     **ctrls = *pctrls;
2436
2437         /* we assume that the first control is the proxyAuthz
2438          * added by back-ldap, so it's the only one we explicitly
2439          * free */
2440         if ( ctrls && ctrls != op->o_ctrls ) {
2441                 assert( ctrls[ 0 ] != NULL );
2442
2443                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
2444                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2445                 }
2446
2447                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
2448         }
2449
2450         *pctrls = NULL;
2451
2452         return 0;
2453 }