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 1999-2007 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         /* allow rootdn as a means to auth without the need to actually
 181          * contact the proxied DSA */
 182         switch ( be_rootdn_bind( op, rs ) ) {
 183         case SLAP_CB_CONTINUE:
 184                 break;
 185
 186         default:
 187                 return rs->sr_err;
 188         }
 189
 190         lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR, NULL, NULL );
 191         if ( !lc ) {
 192                 return rs->sr_err;
 193         }
 194
 195         /* we can do (almost) whatever we want with this conn,
 196          * because either it's temporary, or it's marked as binding */
 197         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
 198                 ch_free( lc->lc_bound_ndn.bv_val );
 199                 BER_BVZERO( &lc->lc_bound_ndn );
 200         }
 201         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
 202                 memset( lc->lc_cred.bv_val, 0, lc->lc_cred.bv_len );
 203                 ch_free( lc->lc_cred.bv_val );
 204                 BER_BVZERO( &lc->lc_cred );
 205         }
 206         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 207
 208 retry:;
 209         /* method is always LDAP_AUTH_SIMPLE if we got here */
 210         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
 211                         LDAP_SASL_SIMPLE,
 212                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
 213         /* FIXME: should we always retry, or only when piping the bind
 214          * in the "override" connection pool? */
 215         rc = ldap_back_op_result( lc, op, rs, msgid,
 216                 li->li_timeout[ SLAP_OP_BIND ],
 217                 LDAP_BACK_BIND_SERR | retrying );
 218         if ( rc == LDAP_UNAVAILABLE && retrying ) {
 219                 retrying &= ~LDAP_BACK_RETRYING;
 220                 if ( ldap_back_retry( &lc, op, rs, LDAP_BACK_BIND_SERR ) ) {
 221                         goto retry;
 222                 }
 223         }
 224
 225         if ( rc == LDAP_SUCCESS ) {
 226                 /* If defined, proxyAuthz will be used also when
 227                  * back-ldap is the authorizing backend; for this
 228                  * purpose, after a successful bind the connection
 229                  * is left for further binds, and further operations
 230                  * on this client connection will use a default
 231                  * connection with identity assertion */
 232                 /* NOTE: use with care */
 233                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
 234                         ldap_back_release_conn( li, lc );
 235                         return( rc );
 236                 }
 237
 238                 /* rebind is now done inside ldap_back_proxy_authz_bind()
 239                  * in case of success */
 240                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 241                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
 242
 243                 if ( !BER_BVISNULL( &lc->lc_cred ) ) {
 244                         memset( lc->lc_cred.bv_val, 0,
 245                                         lc->lc_cred.bv_len );
 246                 }
 247
 248                 if ( LDAP_BACK_SAVECRED( li ) ) {
 249                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
 250                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
 251
 252                 } else {
 253                         lc->lc_cred.bv_len = 0;
 254                 }
 255         }
 256
 257         /* must re-insert if local DN changed as result of bind */
 258         if ( !LDAP_BACK_CONN_ISBOUND( lc )
 259                 || ( !dn_match( &op->o_req_ndn, &lc->lc_local_ndn )
 260                         && !LDAP_BACK_PCONN_ISPRIV( lc ) ) )
 261         {
 262                 int             lerr = -1;
 263                 ldapconn_t      *tmplc;
 264
 265                 /* wait for all other ops to release the connection */
 266 retry_lock:;
 267                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 268                 if ( lc->lc_refcnt > 1 ) {
 269                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 270                         ldap_pvt_thread_yield();
 271                         goto retry_lock;
 272                 }
 273
 274 #if LDAP_BACK_PRINT_CONNTREE > 0
 275                 ldap_back_print_conntree( li, ">>> ldap_back_bind" );
 276 #endif /* LDAP_BACK_PRINT_CONNTREE */
 277
 278                 assert( lc->lc_refcnt == 1 );
 279                 ldap_back_conn_delete( li, lc );
 280
 281                 /* delete all cached connections with the current connection */
 282                 if ( LDAP_BACK_SINGLECONN( li ) ) {
 283                         while ( ( tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc, ldap_back_conn_cmp ) ) != NULL )
 284                         {
 285                                 Debug( LDAP_DEBUG_TRACE,
 286                                         "=>ldap_back_bind: destroying conn %ld (refcnt=%u)\n",
 287                                         LDAP_BACK_PCONN_ID( lc ), lc->lc_refcnt, 0 );
 288
 289                                 if ( tmplc->lc_refcnt != 0 ) {
 290                                         /* taint it */
 291                                         LDAP_BACK_CONN_TAINTED_SET( tmplc );
 292                                         LDAP_BACK_CONN_CACHED_CLEAR( tmplc );
 293
 294                                 } else {
 295                                         /*
 296                                          * Needs a test because the handler may be corrupted,
 297                                          * and calling ldap_unbind on a corrupted header results
 298                                          * in a segmentation fault
 299                                          */
 300                                         ldap_back_conn_free( tmplc );
 301                                 }
 302                         }
 303                 }
 304
 305                 if ( LDAP_BACK_CONN_ISBOUND( lc ) ) {
 306                         ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 307                         if ( be_isroot_dn( op->o_bd, &op->o_req_ndn ) ) {
 308                                 LDAP_BACK_PCONN_ROOTDN_SET( lc, op );
 309                         }
 310                         lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 311                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
 312                 }
 313
 314 #if LDAP_BACK_PRINT_CONNTREE > 0
 315                 ldap_back_print_conntree( li, "<<< ldap_back_bind" );
 316 #endif /* LDAP_BACK_PRINT_CONNTREE */
 317
 318                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 319                 switch ( lerr ) {
 320                 case 0:
 321                         LDAP_BACK_CONN_CACHED_SET( lc );
 322                         break;
 323
 324                 case -1:
 325                         /* duplicate; someone else successfully bound
 326                          * on the same connection with the same identity;
 327                          * we can do this because lc_refcnt == 1 */
 328                         ldap_back_conn_free( lc );
 329                         lc = NULL;
 330                 }
 331         }
 332
 333         if ( lc != NULL ) {
 334                 ldap_back_release_conn( li, lc );
 335         }
 336
 337         return( rc );
 338 }
 339
 340 /*
 341  * ldap_back_conndn_cmp
 342  *
 343  * compares two ldapconn_t based on the value of the conn pointer
 344  * and of the local DN; used by avl stuff for insert, lookup
 345  * and direct delete
 346  */
 347 int
 348 ldap_back_conndn_cmp( const void *c1, const void *c2 )
 349 {
 350         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 351         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 352         int rc;
 353
 354         /* If local DNs don't match, it is definitely not a match */
 355         /* For shared sessions, conn is NULL. Only explicitly
 356          * bound sessions will have non-NULL conn.
 357          */
 358         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 359         if ( rc == 0 ) {
 360                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 361         }
 362
 363         return rc;
 364 }
 365
 366 /*
 367  * ldap_back_conndnlc_cmp
 368  *
 369  * compares two ldapconn_t based on the value of the conn pointer,
 370  * the local DN and the lc pointer; used by avl stuff for insert, lookup
 371  * and direct delete
 372  */
 373 static int
 374 ldap_back_conndnlc_cmp( const void *c1, const void *c2 )
 375 {
 376         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 377         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 378         int rc;
 379
 380         /* If local DNs don't match, it is definitely not a match */
 381         /* For shared sessions, conn is NULL. Only explicitly
 382          * bound sessions will have non-NULL conn.
 383          */
 384         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 385         if ( rc == 0 ) {
 386                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 387                 if ( rc == 0 ) {
 388                         rc = SLAP_PTRCMP( lc1, lc2 );
 389                 }
 390         }
 391
 392         return rc;
 393 }
 394
 395 /*
 396  * ldap_back_conn_cmp
 397  *
 398  * compares two ldapconn_t based on the value of the conn pointer;
 399  * used by avl stuff for delete of all conns with the same connid
 400  */
 401 int
 402 ldap_back_conn_cmp( const void *c1, const void *c2 )
 403 {
 404         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 405         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 406
 407         /* For shared sessions, conn is NULL. Only explicitly
 408          * bound sessions will have non-NULL conn.
 409          */
 410         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 411 }
 412
 413 /*
 414  * ldap_back_conndn_dup
 415  *
 416  * returns -1 in case a duplicate ldapconn_t has been inserted;
 417  * used by avl stuff
 418  */
 419 int
 420 ldap_back_conndn_dup( void *c1, void *c2 )
 421 {
 422         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 423         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 424
 425         /* Cannot have more than one shared session with same DN */
 426         if ( lc1->lc_conn == lc2->lc_conn &&
 427                 dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) )
 428         {
 429                 return -1;
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int
 436 ldap_back_freeconn( ldapinfo_t *li, ldapconn_t *lc, int dolock )
 437 {
 438         if ( dolock ) {
 439                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 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         (void)ldap_back_conn_delete( li, lc );
 447
 448         if ( lc->lc_refcnt == 0 ) {
 449                 ldap_back_conn_free( (void *)lc );
 450         }
 451
 452 #if LDAP_BACK_PRINT_CONNTREE > 0
 453         ldap_back_print_conntree( li, "<<< ldap_back_freeconn" );
 454 #endif /* LDAP_BACK_PRINT_CONNTREE */
 455
 456         if ( dolock ) {
 457                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 458         }
 459
 460         return 0;
 461 }
 462
 463 #ifdef HAVE_TLS
 464 static int
 465 ldap_back_start_tls(
 466         LDAP            *ld,
 467         int             protocol,
 468         int             *is_tls,
 469         const char      *url,
 470         unsigned        flags,
 471         int             retries,
 472         const char      **text )
 473 {
 474         int             rc = LDAP_SUCCESS;
 475
 476         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 477         if ( ( LDAP_BACK_USE_TLS_F( flags ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS_F( flags ) ) )
 478                                 && !ldap_is_ldaps_url( url ) )
 479         {
 480 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 481                 /*
 482                  * use asynchronous StartTLS
 483                  * in case, chase referral (not implemented yet)
 484                  */
 485                 int             msgid;
 486
 487                 if ( protocol == 0 ) {
 488                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 489                                         (void *)&protocol );
 490                 }
 491
 492                 if ( protocol < LDAP_VERSION3 ) {
 493                         /* we should rather bail out... */
 494                         rc = LDAP_UNWILLING_TO_PERFORM;
 495                         *text = "invalid protocol version";
 496                 }
 497
 498                 if ( rc == LDAP_SUCCESS ) {
 499                         rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 500                 }
 501
 502                 if ( rc == LDAP_SUCCESS ) {
 503                         LDAPMessage     *res = NULL;
 504                         struct timeval  tv;
 505
 506                         LDAP_BACK_TV_SET( &tv );
 507
 508 retry:;
 509                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 510                         if ( rc < 0 ) {
 511                                 rc = LDAP_UNAVAILABLE;
 512
 513                         } else if ( rc == 0 ) {
 514                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 515                                         ldap_pvt_thread_yield();
 516                                         if ( retries > 0 ) {
 517                                                 retries--;
 518                                         }
 519                                         LDAP_BACK_TV_SET( &tv );
 520                                         goto retry;
 521                                 }
 522                                 rc = LDAP_UNAVAILABLE;
 523
 524                         } else if ( rc == LDAP_RES_EXTENDED ) {
 525                                 struct berval   *data = NULL;
 526
 527                                 rc = ldap_parse_extended_result( ld, res,
 528                                                 NULL, &data, 0 );
 529                                 if ( rc == LDAP_SUCCESS ) {
 530                                         int err;
 531                                         rc = ldap_parse_result( ld, res, &err,
 532                                                 NULL, NULL, NULL, NULL, 1 );
 533                                         if ( rc == LDAP_SUCCESS ) {
 534                                                 rc = err;
 535                                         }
 536                                         res = NULL;
 537
 538                                         /* FIXME: in case a referral
 539                                          * is returned, should we try
 540                                          * using it instead of the
 541                                          * configured URI? */
 542                                         if ( rc == LDAP_SUCCESS ) {
 543                                                 rc = ldap_install_tls( ld );
 544
 545                                         } else if ( rc == LDAP_REFERRAL ) {
 546                                                 rc = LDAP_UNWILLING_TO_PERFORM;
 547                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 548                                         }
 549
 550                                         if ( data ) {
 551                                                 if ( data->bv_val ) {
 552                                                         ber_memfree( data->bv_val );
 553                                                 }
 554                                                 ber_memfree( data );
 555                                         }
 556                                 }
 557
 558                         } else {
 559                                 rc = LDAP_OTHER;
 560                         }
 561
 562                         if ( res != NULL ) {
 563                                 ldap_msgfree( res );
 564                         }
 565                 }
 566 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 567                 /*
 568                  * use synchronous StartTLS
 569                  */
 570                 rc = ldap_start_tls_s( ld, NULL, NULL );
 571 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 572
 573                 /* if StartTLS is requested, only attempt it if the URL
 574                  * is not "ldaps://"; this may occur not only in case
 575                  * of misconfiguration, but also when used in the chain
 576                  * overlay, where the "uri" can be parsed out of a referral */
 577                 switch ( rc ) {
 578                 case LDAP_SUCCESS:
 579                         *is_tls = 1;
 580                         break;
 581
 582                 case LDAP_SERVER_DOWN:
 583                         break;
 584
 585                 default:
 586                         if ( LDAP_BACK_TLS_CRITICAL_F( flags ) ) {
 587                                 *text = "could not start TLS";
 588                                 break;
 589                         }
 590
 591                         /* in case Start TLS is not critical */
 592                         *is_tls = 0;
 593                         rc = LDAP_SUCCESS;
 594                         break;
 595                 }
 596
 597         } else {
 598                 *is_tls = 0;
 599         }
 600
 601         return rc;
 602 }
 603 #endif /* HAVE_TLS */
 604
 605 static int
 606 ldap_back_prepare_conn( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 607 {
 608         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 609         int             version;
 610         LDAP            *ld = NULL;
 611 #ifdef HAVE_TLS
 612         int             is_tls = op->o_conn->c_is_tls;
 613         time_t          lc_time = (time_t)(-1);
 614         slap_bindconf *sb;
 615 #endif /* HAVE_TLS */
 616
 617         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 618         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 619         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 620         if ( rs->sr_err != LDAP_SUCCESS ) {
 621                 goto error_return;
 622         }
 623
 624         if ( li->li_urllist_f ) {
 625                 ldap_set_urllist_proc( ld, li->li_urllist_f, li->li_urllist_p );
 626         }
 627
 628         /* Set LDAP version. This will always succeed: If the client
 629          * bound with a particular version, then so can we.
 630          */
 631         if ( li->li_version != 0 ) {
 632                 version = li->li_version;
 633
 634         } else if ( op->o_protocol != 0 ) {
 635                 version = op->o_protocol;
 636
 637         } else {
 638                 /* assume it's an internal op; set to LDAPv3 */
 639                 version = LDAP_VERSION3;
 640         }
 641         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&version );
 642
 643         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 644         ldap_set_option( ld, LDAP_OPT_REFERRALS,
 645                 LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 646
 647         if ( li->li_network_timeout > 0 ) {
 648                 struct timeval          tv;
 649
 650                 tv.tv_sec = li->li_network_timeout;
 651                 tv.tv_usec = 0;
 652                 ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
 653         }
 654
 655 #ifdef HAVE_TLS
 656         if ( LDAP_BACK_CONN_ISPRIV( lc ) ) {
 657                 sb = &li->li_acl;
 658
 659         } else if ( LDAP_BACK_CONN_ISIDASSERT( lc ) ) {
 660                 sb = &li->li_idassert.si_bc;
 661
 662         } else {
 663                 sb = &li->li_tls;
 664         }
 665
 666         if ( sb->sb_tls_do_init ) {
 667                 bindconf_tls_set( sb, ld );
 668         } else if ( sb->sb_tls_ctx ) {
 669                 ldap_set_option( ld, LDAP_OPT_X_TLS_CTX, sb->sb_tls_ctx );
 670         }
 671
 672         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
 673         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 674                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 675         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
 676         if ( rs->sr_err != LDAP_SUCCESS ) {
 677                 ldap_unbind_ext( ld, NULL, NULL );
 678                 rs->sr_text = "Start TLS failed";
 679                 goto error_return;
 680
 681         } else if ( li->li_idle_timeout ) {
 682                 /* only touch when activity actually took place... */
 683                 lc_time = op->o_time;
 684         }
 685 #endif /* HAVE_TLS */
 686
 687         lc->lc_ld = ld;
 688         lc->lc_refcnt = 1;
 689 #ifdef HAVE_TLS
 690         if ( is_tls ) {
 691                 LDAP_BACK_CONN_ISTLS_SET( lc );
 692         } else {
 693                 LDAP_BACK_CONN_ISTLS_CLEAR( lc );
 694         }
 695         if ( lc_time != (time_t)(-1) ) {
 696                 lc->lc_time = lc_time;
 697         }
 698 #endif /* HAVE_TLS */
 699
 700 error_return:;
 701         if ( rs->sr_err != LDAP_SUCCESS ) {
 702                 rs->sr_err = slap_map_api2result( rs );
 703                 if ( sendok & LDAP_BACK_SENDERR ) {
 704                         if ( rs->sr_text == NULL ) {
 705                                 rs->sr_text = "Proxy connection initialization failed";
 706                         }
 707                         send_ldap_result( op, rs );
 708                 }
 709
 710         } else {
 711                 if ( li->li_conn_ttl > 0 ) {
 712                         lc->lc_create_time = op->o_time;
 713                 }
 714         }
 715
 716         return rs->sr_err;
 717 }
 718
 719 static ldapconn_t *
 720 ldap_back_getconn(
 721         Operation               *op,
 722         SlapReply               *rs,
 723         ldap_back_send_t        sendok,
 724         struct berval           *binddn,
 725         struct berval           *bindcred )
 726 {
 727         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 728         ldapconn_t      *lc = NULL,
 729                         lc_curr = { 0 };
 730         int             refcnt = 1,
 731                         lookupconn = !( sendok & LDAP_BACK_BINDING );
 732
 733         /* if the server is quarantined, and
 734          * - the current interval did not expire yet, or
 735          * - no more retries should occur,
 736          * don't return the connection */
 737         if ( li->li_isquarantined ) {
 738                 slap_retry_info_t       *ri = &li->li_quarantine;
 739                 int                     dont_retry = 1;
 740
 741                 if ( li->li_quarantine.ri_interval ) {
 742                         ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
 743                         if ( li->li_isquarantined == LDAP_BACK_FQ_YES ) {
 744                                 dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
 745                                         || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
 746                                 if ( !dont_retry ) {
 747                                         Debug( LDAP_DEBUG_ANY,
 748                                                 "%s: ldap_back_getconn quarantine "
 749                                                 "retry block #%d try #%d.\n",
 750                                                 op->o_log_prefix, ri->ri_idx, ri->ri_count );
 751                                         li->li_isquarantined = LDAP_BACK_FQ_RETRYING;
 752                                 }
 753                         }
 754                         ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
 755                 }
 756
 757                 if ( dont_retry ) {
 758                         rs->sr_err = LDAP_UNAVAILABLE;
 759                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 760                                 rs->sr_text = "Target is quarantined";
 761                                 send_ldap_result( op, rs );
 762                         }
 763                         return NULL;
 764                 }
 765         }
 766
 767         /* Internal searches are privileged and shared. So is root. */
 768         if ( op->o_do_not_cache || be_isroot( op ) ) {
 769                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 770                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 771                 LDAP_BACK_PCONN_ROOTDN_SET( &lc_curr, op );
 772
 773         } else {
 774                 struct berval   tmpbinddn,
 775                                 tmpbindcred,
 776                                 save_o_dn,
 777                                 save_o_ndn;
 778                 int             isproxyauthz;
 779
 780                 /* need cleanup */
 781                 if ( binddn == NULL ) {
 782                         binddn = &tmpbinddn;
 783                 }
 784                 if ( bindcred == NULL ) {
 785                         bindcred = &tmpbindcred;
 786                 }
 787                 if ( op->o_tag == LDAP_REQ_BIND ) {
 788                         save_o_dn = op->o_dn;
 789                         save_o_ndn = op->o_ndn;
 790                         op->o_dn = op->o_req_dn;
 791                         op->o_ndn = op->o_req_ndn;
 792                 }
 793                 isproxyauthz = ldap_back_is_proxy_authz( op, rs, sendok, binddn, bindcred );
 794                 if ( op->o_tag == LDAP_REQ_BIND ) {
 795                         op->o_dn = save_o_dn;
 796                         op->o_ndn = save_o_ndn;
 797                 }
 798                 if ( isproxyauthz == -1 ) {
 799                         return NULL;
 800                 }
 801
 802                 lc_curr.lc_local_ndn = op->o_ndn;
 803                 /* Explicit binds must not be shared;
 804                  * however, explicit binds are piped in a special connection
 805                  * when idassert is to occur with "override" set */
 806                 if ( op->o_tag == LDAP_REQ_BIND && !isproxyauthz ) {
 807                         lc_curr.lc_conn = op->o_conn;
 808
 809                 } else {
 810                         if ( isproxyauthz && !( sendok & LDAP_BACK_BINDING ) ) {
 811                                 lc_curr.lc_local_ndn = *binddn;
 812                                 LDAP_BACK_PCONN_ROOTDN_SET( &lc_curr, op );
 813                                 LDAP_BACK_CONN_ISIDASSERT_SET( &lc_curr );
 814
 815                         } else if ( isproxyauthz && ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) {
 816                                 lc_curr.lc_local_ndn = slap_empty_bv;
 817                                 LDAP_BACK_PCONN_BIND_SET( &lc_curr, op );
 818                                 LDAP_BACK_CONN_ISIDASSERT_SET( &lc_curr );
 819                                 lookupconn = 1;
 820
 821                         } else if ( SLAP_IS_AUTHZ_BACKEND( op ) ) {
 822                                 lc_curr.lc_conn = op->o_conn;
 823
 824                         } else {
 825                                 LDAP_BACK_PCONN_ANON_SET( &lc_curr, op );
 826                         }
 827                 }
 828         }
 829
 830         /* Explicit Bind requests always get their own conn */
 831         if ( lookupconn ) {
 832 retry_lock:
 833                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 834                 if ( LDAP_BACK_PCONN_ISPRIV( &lc_curr ) ) {
 835                         /* lookup a conn that's not binding */
 836                         LDAP_TAILQ_FOREACH( lc,
 837                                 &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( &lc_curr ) ].lic_priv,
 838                                 lc_q )
 839                         {
 840                                 if ( !LDAP_BACK_CONN_BINDING( lc ) && lc->lc_refcnt == 0 ) {
 841                                         break;
 842                                 }
 843                         }
 844
 845                         if ( lc != NULL ) {
 846                                 if ( lc != LDAP_TAILQ_LAST( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv,
 847                                         ldapconn_t, lc_q ) )
 848                                 {
 849                                         LDAP_TAILQ_REMOVE( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv,
 850                                                 lc, lc_q );
 851                                         LDAP_TAILQ_ENTRY_INIT( lc, lc_q );
 852                                         LDAP_TAILQ_INSERT_TAIL( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv,
 853                                                 lc, lc_q );
 854                                 }
 855
 856                         } else if ( !LDAP_BACK_USE_TEMPORARIES( li )
 857                                 && li->li_conn_priv[ LDAP_BACK_CONN2PRIV( &lc_curr ) ].lic_num == li->li_conn_priv_max )
 858                         {
 859                                 lc = LDAP_TAILQ_FIRST( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( &lc_curr ) ].lic_priv );
 860                         }
 861
 862                 } else {
 863
 864                         /* Searches for a ldapconn in the avl tree */
 865                         lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 866                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 867                 }
 868
 869                 if ( lc != NULL ) {
 870                         /* Don't reuse connections while they're still binding */
 871                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 872                                 if ( !LDAP_BACK_USE_TEMPORARIES( li ) ) {
 873                                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 874
 875                                         ldap_pvt_thread_yield();
 876                                         goto retry_lock;
 877                                 }
 878                                 lc = NULL;
 879                         }
 880
 881                         if ( lc != NULL ) {
 882                                 if ( op->o_tag == LDAP_REQ_BIND ) {
 883                                         /* right now, this is the only possible case */
 884                                         assert( ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) );
 885                                         LDAP_BACK_CONN_BINDING_SET( lc );
 886                                 }
 887
 888                                 refcnt = ++lc->lc_refcnt;
 889                         }
 890                 }
 891                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 892         }
 893
 894         /* Looks like we didn't get a bind. Open a new session... */
 895         if ( lc == NULL ) {
 896                 lc = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 897                 lc->lc_flags = li->li_flags;
 898                 lc->lc_lcflags = lc_curr.lc_lcflags;
 899                 if ( ldap_back_prepare_conn( lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 900                         ch_free( lc );
 901                         return NULL;
 902                 }
 903
 904                 if ( sendok & LDAP_BACK_BINDING ) {
 905                         LDAP_BACK_CONN_BINDING_SET( lc );
 906                 }
 907
 908                 lc->lc_conn = lc_curr.lc_conn;
 909                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 910
 911                 /*
 912                  * the rationale is: connections as the rootdn are privileged,
 913                  * so acl_authcDN is to be used; however, in some cases
 914                  * one already configured identity assertion with a highly
 915                  * privileged idassert_authcDN, so if acl_authcDN is NULL
 916                  * and idassert_authcDN is not, use the second instead.
 917                  *
 918                  * might change in the future, because it's preferable
 919                  * to make clear what identity is being used, since
 920                  * the only drawback is that one risks to configure
 921                  * the same identity twice...
 922                  */
 923                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 924                         if ( BER_BVISNULL( &li->li_acl_authcDN ) && !BER_BVISNULL( &li->li_idassert_authcDN ) ) {
 925                                 ber_dupbv( &lc->lc_bound_ndn, &li->li_idassert_authcDN );
 926                                 ber_dupbv( &lc->lc_cred, &li->li_idassert_passwd );
 927
 928                         } else {
 929                                 ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 930                                 ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 931                         }
 932                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 933
 934                 } else if ( LDAP_BACK_CONN_ISIDASSERT( &lc_curr ) ) {
 935                         if ( !LDAP_BACK_PCONN_ISBIND( &lc_curr ) ) {
 936                                 ber_dupbv( &lc->lc_bound_ndn, &li->li_idassert_authcDN );
 937                                 ber_dupbv( &lc->lc_cred, &li->li_idassert_passwd );
 938                         }
 939                         LDAP_BACK_CONN_ISIDASSERT_SET( lc );
 940
 941                 } else {
 942                         BER_BVZERO( &lc->lc_cred );
 943                         BER_BVZERO( &lc->lc_bound_ndn );
 944                         if ( !BER_BVISEMPTY( &op->o_ndn )
 945                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 946                         {
 947                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 948                         }
 949                 }
 950
 951 #ifdef HAVE_TLS
 952                 /* if start TLS failed but it was not mandatory,
 953                  * check if the non-TLS connection was already
 954                  * in cache; in case, destroy the newly created
 955                  * connection and use the existing one */
 956                 if ( LDAP_BACK_PCONN_ISTLS( lc )
 957                                 && !ldap_tls_inplace( lc->lc_ld ) )
 958                 {
 959                         ldapconn_t      *tmplc = NULL;
 960                         int             idx = LDAP_BACK_CONN2PRIV( &lc_curr ) - 1;
 961
 962                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 963                         LDAP_TAILQ_FOREACH( tmplc,
 964                                 &li->li_conn_priv[ idx ].lic_priv,
 965                                 lc_q )
 966                         {
 967                                 if ( !LDAP_BACK_CONN_BINDING( tmplc ) ) {
 968                                         break;
 969                                 }
 970                         }
 971
 972                         if ( tmplc != NULL ) {
 973                                 refcnt = ++tmplc->lc_refcnt;
 974                                 ldap_back_conn_free( lc );
 975                                 lc = tmplc;
 976                         }
 977                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 978
 979                         if ( tmplc != NULL ) {
 980                                 goto done;
 981                         }
 982                 }
 983 #endif /* HAVE_TLS */
 984
 985                 /* Inserts the newly created ldapconn in the avl tree */
 986                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 987
 988                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 989
 990                 assert( lc->lc_refcnt == 1 );
 991
 992 #if LDAP_BACK_PRINT_CONNTREE > 0
 993                 ldap_back_print_conntree( li, ">>> ldap_back_getconn(insert)" );
 994 #endif /* LDAP_BACK_PRINT_CONNTREE */
 995
 996                 if ( LDAP_BACK_PCONN_ISPRIV( lc ) ) {
 997                         if ( li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_num < li->li_conn_priv_max ) {
 998                                 LDAP_TAILQ_INSERT_TAIL( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv, lc, lc_q );
 999                                 li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_num++;
1000                                 LDAP_BACK_CONN_CACHED_SET( lc );
1001
1002                         } else {
1003                                 LDAP_BACK_CONN_TAINTED_SET( lc );
1004                         }
1005                         rs->sr_err = 0;
1006
1007                 } else {
1008                         rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
1009                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
1010                         LDAP_BACK_CONN_CACHED_SET( lc );
1011                 }
1012
1013 #if LDAP_BACK_PRINT_CONNTREE > 0
1014                 ldap_back_print_conntree( li, "<<< ldap_back_getconn(insert)" );
1015 #endif /* LDAP_BACK_PRINT_CONNTREE */
1016
1017                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1018
1019                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1020                         char    buf[ SLAP_TEXT_BUFLEN ];
1021
1022                         snprintf( buf, sizeof( buf ),
1023                                 "lc=%p inserted refcnt=%u rc=%d",
1024                                 (void *)lc, refcnt, rs->sr_err );
1025
1026                         Debug( LDAP_DEBUG_TRACE,
1027                                 "=>ldap_back_getconn: %s: %s\n",
1028                                 op->o_log_prefix, buf, 0 );
1029                 }
1030
1031                 if ( !LDAP_BACK_PCONN_ISPRIV( lc ) ) {
1032                         /* Err could be -1 in case a duplicate ldapconn is inserted */
1033                         switch ( rs->sr_err ) {
1034                         case 0:
1035                                 break;
1036
1037                         case -1:
1038                                 LDAP_BACK_CONN_CACHED_CLEAR( lc );
1039                                 if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( li ) ) {
1040                                         /* duplicate: free and try to get the newly created one */
1041                                         ldap_back_conn_free( lc );
1042                                         lc = NULL;
1043                                         goto retry_lock;
1044                                 }
1045
1046                                 /* taint connection, so that it'll be freed when released */
1047                                 LDAP_BACK_CONN_TAINTED_SET( lc );
1048                                 break;
1049
1050                         default:
1051                                 LDAP_BACK_CONN_CACHED_CLEAR( lc );
1052                                 ldap_back_conn_free( lc );
1053                                 rs->sr_err = LDAP_OTHER;
1054                                 rs->sr_text = "Proxy bind collision";
1055                                 if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
1056                                         send_ldap_result( op, rs );
1057                                 }
1058                                 return NULL;
1059                         }
1060                 }
1061
1062         } else {
1063                 int     expiring = 0;
1064
1065                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
1066                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
1067                 {
1068                         expiring = 1;
1069
1070                         /* let it be used, but taint/delete it so that
1071                          * no-one else can look it up any further */
1072                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1073
1074 #if LDAP_BACK_PRINT_CONNTREE > 0
1075                         ldap_back_print_conntree( li, ">>> ldap_back_getconn(timeout)" );
1076 #endif /* LDAP_BACK_PRINT_CONNTREE */
1077
1078                         (void)ldap_back_conn_delete( li, lc );
1079                         LDAP_BACK_CONN_TAINTED_SET( lc );
1080
1081 #if LDAP_BACK_PRINT_CONNTREE > 0
1082                         ldap_back_print_conntree( li, "<<< ldap_back_getconn(timeout)" );
1083 #endif /* LDAP_BACK_PRINT_CONNTREE */
1084
1085                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1086                 }
1087
1088                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
1089                         char    buf[ SLAP_TEXT_BUFLEN ];
1090
1091                         snprintf( buf, sizeof( buf ),
1092                                 "conn %p fetched refcnt=%u%s",
1093                                 (void *)lc, refcnt,
1094                                 expiring ? " expiring" : "" );
1095                         Debug( LDAP_DEBUG_TRACE,
1096                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
1097                 }
1098         }
1099
1100 #ifdef HAVE_TLS
1101 done:;
1102 #endif /* HAVE_TLS */
1103
1104         return lc;
1105 }
1106
1107 void
1108 ldap_back_release_conn_lock(
1109         ldapinfo_t              *li,
1110         ldapconn_t              **lcp,
1111         int                     dolock )
1112 {
1113
1114         ldapconn_t      *lc = *lcp;
1115
1116         if ( dolock ) {
1117                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1118         }
1119         assert( lc->lc_refcnt > 0 );
1120         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1121         lc->lc_refcnt--;
1122         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
1123                 ldap_back_freeconn( li, lc, 0 );
1124                 *lcp = NULL;
1125         }
1126         if ( dolock ) {
1127                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1128         }
1129 }
1130
1131 void
1132 ldap_back_quarantine(
1133         Operation       *op,
1134         SlapReply       *rs )
1135 {
1136         ldapinfo_t              *li = (ldapinfo_t *)op->o_bd->be_private;
1137
1138         slap_retry_info_t       *ri = &li->li_quarantine;
1139
1140         ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
1141
1142         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1143                 time_t          new_last = slap_get_time();
1144
1145                 switch ( li->li_isquarantined ) {
1146                 case LDAP_BACK_FQ_NO:
1147                         if ( ri->ri_last == new_last ) {
1148                                 goto done;
1149                         }
1150
1151                         Debug( LDAP_DEBUG_ANY,
1152                                 "%s: ldap_back_quarantine enter.\n",
1153                                 op->o_log_prefix, 0, 0 );
1154
1155                         ri->ri_idx = 0;
1156                         ri->ri_count = 0;
1157                         break;
1158
1159                 case LDAP_BACK_FQ_RETRYING:
1160                         Debug( LDAP_DEBUG_ANY,
1161                                 "%s: ldap_back_quarantine block #%d try #%d failed.\n",
1162                                 op->o_log_prefix, ri->ri_idx, ri->ri_count );
1163
1164                         ++ri->ri_count;
1165                         if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
1166                                 && ri->ri_count == ri->ri_num[ ri->ri_idx ] )
1167                         {
1168                                 ri->ri_count = 0;
1169                                 ++ri->ri_idx;
1170                         }
1171                         break;
1172
1173                 default:
1174                         break;
1175                 }
1176
1177                 li->li_isquarantined = LDAP_BACK_FQ_YES;
1178                 ri->ri_last = new_last;
1179
1180         } else if ( li->li_isquarantined != LDAP_BACK_FQ_NO ) {
1181                 if ( ri->ri_last == slap_get_time() ) {
1182                         goto done;
1183                 }
1184
1185                 Debug( LDAP_DEBUG_ANY,
1186                         "%s: ldap_back_quarantine exit (%d) err=%d.\n",
1187                         op->o_log_prefix, li->li_isquarantined, rs->sr_err );
1188
1189                 if ( li->li_quarantine_f ) {
1190                         (void)li->li_quarantine_f( li, li->li_quarantine_p );
1191                 }
1192
1193                 ri->ri_count = 0;
1194                 ri->ri_idx = 0;
1195                 li->li_isquarantined = LDAP_BACK_FQ_NO;
1196         }
1197
1198 done:;
1199         ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
1200 }
1201
1202 static int
1203 ldap_back_dobind_cb(
1204         Operation *op,
1205         SlapReply *rs
1206 )
1207 {
1208         ber_tag_t *tptr = op->o_callback->sc_private;
1209         op->o_tag = *tptr;
1210         return SLAP_CB_CONTINUE;
1211 }
1212
1213 /*
1214  * ldap_back_dobind_int
1215  *
1216  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
1217  */
1218 static int
1219 ldap_back_dobind_int(
1220         ldapconn_t              **lcp,
1221         Operation               *op,
1222         SlapReply               *rs,
1223         ldap_back_send_t        sendok,
1224         int                     retries,
1225         int                     dolock )
1226 {
1227         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1228
1229         ldapconn_t      *lc;
1230         struct berval   binddn = slap_empty_bv,
1231                         bindcred = slap_empty_bv;
1232
1233         int             rc = 0,
1234                         isbound,
1235                         binding = 0;
1236         ber_int_t       msgid;
1237         ber_tag_t       o_tag = op->o_tag;
1238         slap_callback cb = {0};
1239
1240         assert( lcp != NULL );
1241         assert( retries >= 0 );
1242
1243         if ( sendok & LDAP_BACK_GETCONN ) {
1244                 assert( *lcp == NULL );
1245
1246                 lc = ldap_back_getconn( op, rs, sendok, &binddn, &bindcred );
1247                 if ( lc == NULL ) {
1248                         return 0;
1249                 }
1250                 *lcp = lc;
1251
1252         } else {
1253                 lc = *lcp;
1254         }
1255
1256         assert( lc != NULL );
1257
1258 retry_lock:;
1259         if ( dolock ) {
1260                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1261         }
1262
1263         if ( binding == 0 ) {
1264                 /* check if already bound */
1265                 rc = isbound = LDAP_BACK_CONN_ISBOUND( lc );
1266                 if ( isbound ) {
1267                         if ( dolock ) {
1268                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1269                         }
1270                         return rc;
1271                 }
1272
1273                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
1274                         /* if someone else is about to bind it, give up and retry */
1275                         if ( dolock ) {
1276                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1277                         }
1278                         ldap_pvt_thread_yield();
1279                         goto retry_lock;
1280
1281                 } else {
1282                         /* otherwise this thread will bind it */
1283                         LDAP_BACK_CONN_BINDING_SET( lc );
1284                         binding = 1;
1285                 }
1286         }
1287
1288         if ( dolock ) {
1289                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1290         }
1291
1292         /*
1293          * FIXME: we need to let clients use proxyAuthz
1294          * otherwise we cannot do symmetric pools of servers;
1295          * we have to live with the fact that a user can
1296          * authorize itself as any ID that is allowed
1297          * by the authzTo directive of the "proxyauthzdn".
1298          */
1299         /*
1300          * NOTE: current Proxy Authorization specification
1301          * and implementation do not allow proxy authorization
1302          * control to be provided with Bind requests
1303          */
1304         /*
1305          * if no bind took place yet, but the connection is bound
1306          * and the "idassert-authcDN" (or other ID) is set,
1307          * then bind as the asserting identity and explicitly
1308          * add the proxyAuthz control to every operation with the
1309          * dn bound to the connection as control value.
1310          * This is done also if this is the authorizing backend,
1311          * but the "override" flag is given to idassert.
1312          * It allows to use SASL bind and yet proxyAuthz users
1313          */
1314         op->o_tag = LDAP_REQ_BIND;
1315         cb.sc_next = op->o_callback;
1316         cb.sc_private = &o_tag;
1317         cb.sc_response = ldap_back_dobind_cb;
1318         op->o_callback = &cb;
1319
1320         if ( LDAP_BACK_CONN_ISIDASSERT( lc ) ) {
1321                 if ( BER_BVISEMPTY( &binddn ) && BER_BVISEMPTY( &bindcred ) ) {
1322                         /* if we got here, it shouldn't return result */
1323                         rc = ldap_back_is_proxy_authz( op, rs,
1324                                 LDAP_BACK_DONTSEND, &binddn, &bindcred );
1325                         assert( rc == 1 );
1326                 }
1327                 rc = ldap_back_proxy_authz_bind( lc, op, rs, sendok, &binddn, &bindcred );
1328                 goto done;
1329         }
1330
1331 #ifdef HAVE_CYRUS_SASL
1332         if ( LDAP_BACK_CONN_ISPRIV( lc )
1333                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
1334         {
1335                 void            *defaults = NULL;
1336
1337                 if ( li->li_acl_secprops != NULL ) {
1338                         rc = ldap_set_option( lc->lc_ld,
1339                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops );
1340
1341                         if ( rc != LDAP_OPT_SUCCESS ) {
1342                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
1343                                         "(SECPROPS,\"%s\") failed!\n",
1344                                         li->li_acl_secprops, 0, 0 );
1345                                 goto done;
1346                         }
1347                 }
1348
1349                 defaults = lutil_sasl_defaults( lc->lc_ld,
1350                                 li->li_acl_sasl_mech.bv_val,
1351                                 li->li_acl_sasl_realm.bv_val,
1352                                 li->li_acl_authcID.bv_val,
1353                                 li->li_acl_passwd.bv_val,
1354                                 NULL );
1355                 if ( defaults == NULL ) {
1356                         rs->sr_err = LDAP_OTHER;
1357                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1358                         if ( sendok & LDAP_BACK_SENDERR ) {
1359                                 send_ldap_result( op, rs );
1360                         }
1361                         goto done;
1362                 }
1363
1364                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
1365                                 li->li_acl_authcDN.bv_val,
1366                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
1367                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1368                                 defaults );
1369
1370                 lutil_sasl_freedefs( defaults );
1371
1372                 rs->sr_err = slap_map_api2result( rs );
1373                 if ( rs->sr_err != LDAP_SUCCESS ) {
1374                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1375                         if ( sendok & LDAP_BACK_SENDERR ) {
1376                                 send_ldap_result( op, rs );
1377                         }
1378
1379                 } else {
1380                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1381                 }
1382
1383                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1384                         ldap_back_quarantine( op, rs );
1385                 }
1386
1387                 goto done;
1388         }
1389 #endif /* HAVE_CYRUS_SASL */
1390
1391 retry:;
1392         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1393                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1394                         LDAP_SASL_SIMPLE, &lc->lc_cred,
1395                         NULL, NULL, &msgid );
1396
1397         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
1398                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
1399                         if ( dolock ) {
1400                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1401                         }
1402
1403                         assert( lc->lc_refcnt > 0 );
1404                         if ( lc->lc_refcnt == 1 ) {
1405                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
1406                                 lc->lc_ld = NULL;
1407
1408                                 /* lc here must be the regular lc, reset and ready for init */
1409                                 rs->sr_err = ldap_back_prepare_conn( lc, op, rs, sendok );
1410                                 if ( rs->sr_err != LDAP_SUCCESS ) {
1411                                         sendok &= ~LDAP_BACK_SENDERR;
1412                                         lc->lc_refcnt = 0;
1413                                 }
1414                         }
1415
1416                         if ( dolock ) {
1417                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1418                         }
1419
1420                         if ( rs->sr_err == LDAP_SUCCESS ) {
1421                                 if ( retries > 0 ) {
1422                                         retries--;
1423                                 }
1424                                 goto retry;
1425                         }
1426                 }
1427
1428                 assert( lc->lc_refcnt == 1 );
1429                 lc->lc_refcnt = 0;
1430                 ldap_back_freeconn( li, lc, dolock );
1431                 *lcp = NULL;
1432                 rs->sr_err = slap_map_api2result( rs );
1433
1434                 if ( LDAP_BACK_QUARANTINE( li ) ) {
1435                         ldap_back_quarantine( op, rs );
1436                 }
1437
1438                 if ( rs->sr_err != LDAP_SUCCESS &&
1439                         ( sendok & LDAP_BACK_SENDERR ) )
1440                 {
1441                         if ( op->o_callback == &cb )
1442                                 op->o_callback = cb.sc_next;
1443                         op->o_tag = o_tag;
1444                         rs->sr_text = "Internal proxy bind failure";
1445                         send_ldap_result( op, rs );
1446                 }
1447
1448                 rc = 0;
1449                 goto leave;
1450         }
1451
1452         rc = ldap_back_op_result( lc, op, rs, msgid,
1453                 -1, ( sendok | LDAP_BACK_BINDING ) );
1454         if ( rc == LDAP_SUCCESS ) {
1455                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1456         }
1457
1458 done:;
1459         LDAP_BACK_CONN_BINDING_CLEAR( lc );
1460         rc = LDAP_BACK_CONN_ISBOUND( lc );
1461         if ( !rc ) {
1462                 ldap_back_release_conn_lock( li, lcp, dolock );
1463
1464         } else if ( LDAP_BACK_SAVECRED( li ) ) {
1465                 ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
1466         }
1467
1468 leave:;
1469         if ( op->o_callback == &cb )
1470                 op->o_callback = cb.sc_next;
1471         op->o_tag = o_tag;
1472
1473         return rc;
1474 }
1475
1476 /*
1477  * ldap_back_dobind
1478  *
1479  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
1480  */
1481 int
1482 ldap_back_dobind( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1483 {
1484         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1485
1486         return ldap_back_dobind_int( lcp, op, rs,
1487                 ( sendok | LDAP_BACK_GETCONN ), li->li_nretries, 1 );
1488 }
1489
1490 /*
1491  * ldap_back_default_rebind
1492  *
1493  * This is a callback used for chasing referrals using the same
1494  * credentials as the original user on this session.
1495  */
1496 int
1497 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1498         ber_int_t msgid, void *params )
1499 {
1500         ldapconn_t      *lc = (ldapconn_t *)params;
1501
1502 #ifdef HAVE_TLS
1503         /* ... otherwise we couldn't get here */
1504         assert( lc != NULL );
1505
1506         if ( !ldap_tls_inplace( ld ) ) {
1507                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1508                                 rc;
1509                 const char      *text = NULL;
1510
1511                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1512                         LDAP_BACK_RETRY_DEFAULT, &text );
1513                 if ( rc != LDAP_SUCCESS ) {
1514                         return rc;
1515                 }
1516         }
1517 #endif /* HAVE_TLS */
1518
1519         /* FIXME: add checks on the URL/identity? */
1520
1521         return ldap_sasl_bind_s( ld,
1522                         BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
1523                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1524 }
1525
1526 /*
1527  * ldap_back_default_urllist
1528  */
1529 int
1530 ldap_back_default_urllist(
1531         LDAP            *ld,
1532         LDAPURLDesc     **urllist,
1533         LDAPURLDesc     **url,
1534         void            *params )
1535 {
1536         ldapinfo_t      *li = (ldapinfo_t *)params;
1537         LDAPURLDesc     **urltail;
1538
1539         if ( urllist == url ) {
1540                 return LDAP_SUCCESS;
1541         }
1542
1543         for ( urltail = &(*url)->lud_next; *urltail; urltail = &(*urltail)->lud_next )
1544                 /* count */ ;
1545
1546         *urltail = *urllist;
1547         *urllist = *url;
1548         *url = NULL;
1549
1550         ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1551         if ( li->li_uri ) {
1552                 ch_free( li->li_uri );
1553         }
1554
1555         ldap_get_option( ld, LDAP_OPT_URI, (void *)&li->li_uri );
1556         ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1557
1558         return LDAP_SUCCESS;
1559 }
1560
1561 int
1562 ldap_back_cancel(
1563                 ldapconn_t              *lc,
1564                 Operation               *op,
1565                 SlapReply               *rs,
1566                 ber_int_t               msgid,
1567                 ldap_back_send_t        sendok )
1568 {
1569         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1570
1571         /* default behavior */
1572         if ( LDAP_BACK_ABANDON( li ) ) {
1573                 return ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1574         }
1575
1576         if ( LDAP_BACK_IGNORE( li ) ) {
1577                 return ldap_pvt_discard( lc->lc_ld, msgid );
1578         }
1579
1580         if ( LDAP_BACK_CANCEL( li ) ) {
1581                 /* FIXME: asynchronous? */
1582                 return ldap_cancel_s( lc->lc_ld, msgid, NULL, NULL );
1583         }
1584
1585         assert( 0 );
1586
1587         return LDAP_OTHER;
1588 }
1589
1590 int
1591 ldap_back_op_result(
1592                 ldapconn_t              *lc,
1593                 Operation               *op,
1594                 SlapReply               *rs,
1595                 ber_int_t               msgid,
1596                 time_t                  timeout,
1597                 ldap_back_send_t        sendok )
1598 {
1599         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1600
1601         char            *match = NULL;
1602         char            *text = NULL;
1603         char            **refs = NULL;
1604         LDAPControl     **ctrls = NULL;
1605
1606 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1607
1608         rs->sr_text = NULL;
1609         rs->sr_matched = NULL;
1610         rs->sr_ref = NULL;
1611         rs->sr_ctrls = NULL;
1612
1613         /* if the error recorded in the reply corresponds
1614          * to a successful state, get the error from the
1615          * remote server response */
1616         if ( ERR_OK( rs->sr_err ) ) {
1617                 int             rc;
1618                 struct timeval  tv;
1619                 LDAPMessage     *res = NULL;
1620                 time_t          stoptime = (time_t)(-1);
1621                 int             timeout_err = op->o_protocol >= LDAP_VERSION3 ?
1622                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OTHER;
1623                 const char      *timeout_text = "Operation timed out";
1624
1625                 /* if timeout is not specified, compute and use
1626                  * the one specific to the ongoing operation */
1627                 if ( timeout == (time_t)(-1) ) {
1628                         slap_op_t       opidx = slap_req2op( op->o_tag );
1629
1630                         if ( opidx == SLAP_OP_SEARCH ) {
1631                                 if ( op->ors_tlimit <= 0 ) {
1632                                         timeout = 0;
1633
1634                                 } else {
1635                                         timeout = op->ors_tlimit;
1636                                         timeout_err = LDAP_TIMELIMIT_EXCEEDED;
1637                                         timeout_text = NULL;
1638                                 }
1639
1640                         } else {
1641                                 timeout = li->li_timeout[ opidx ];
1642                         }
1643                 }
1644
1645                 /* better than nothing :) */
1646                 if ( timeout == 0 ) {
1647                         if ( li->li_idle_timeout ) {
1648                                 timeout = li->li_idle_timeout;
1649
1650                         } else if ( li->li_conn_ttl ) {
1651                                 timeout = li->li_conn_ttl;
1652                         }
1653                 }
1654
1655                 if ( timeout ) {
1656                         stoptime = op->o_time + timeout;
1657                 }
1658
1659                 LDAP_BACK_TV_SET( &tv );
1660
1661 retry:;
1662                 /* if result parsing fails, note the failure reason */
1663                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1664                 switch ( rc ) {
1665                 case 0:
1666                         if ( timeout && slap_get_time() > stoptime ) {
1667                                 if ( sendok & LDAP_BACK_BINDING ) {
1668                                         ldap_unbind_ext( lc->lc_ld, NULL, NULL );
1669                                         lc->lc_ld = NULL;
1670
1671                                         /* let it be used, but taint/delete it so that
1672                                          * no-one else can look it up any further */
1673                                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1674
1675 #if LDAP_BACK_PRINT_CONNTREE > 0
1676                                         ldap_back_print_conntree( li, ">>> ldap_back_getconn(timeout)" );
1677 #endif /* LDAP_BACK_PRINT_CONNTREE */
1678
1679                                         (void)ldap_back_conn_delete( li, lc );
1680                                         LDAP_BACK_CONN_TAINTED_SET( lc );
1681
1682 #if LDAP_BACK_PRINT_CONNTREE > 0
1683                                         ldap_back_print_conntree( li, "<<< ldap_back_getconn(timeout)" );
1684 #endif /* LDAP_BACK_PRINT_CONNTREE */
1685                                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1686
1687                                 } else {
1688                                         (void)ldap_back_cancel( lc, op, rs, msgid, sendok );
1689                                 }
1690                                 rs->sr_err = timeout_err;
1691                                 rs->sr_text = timeout_text;
1692                                 break;
1693                         }
1694
1695                         /* timeout == 0 */
1696                         LDAP_BACK_TV_SET( &tv );
1697                         ldap_pvt_thread_yield();
1698                         goto retry;
1699
1700                 case -1:
1701                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1702                                         &rs->sr_err );
1703                         break;
1704
1705
1706                 /* otherwise get the result; if it is not
1707                  * LDAP_SUCCESS, record it in the reply
1708                  * structure (this includes
1709                  * LDAP_COMPARE_{TRUE|FALSE}) */
1710                 default:
1711                         /* only touch when activity actually took place... */
1712                         if ( li->li_idle_timeout && lc ) {
1713                                 lc->lc_time = op->o_time;
1714                         }
1715
1716                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1717                                         &match, &text, &refs, &ctrls, 1 );
1718                         rs->sr_text = text;
1719                         if ( rc != LDAP_SUCCESS ) {
1720                                 rs->sr_err = rc;
1721                         }
1722
1723                         /* RFC 4511: referrals can only appear
1724                          * if result code is LDAP_REFERRAL */
1725                         if ( refs != NULL
1726                                 && refs[ 0 ] != NULL
1727                                 && refs[ 0 ][ 0 ] != '\0' )
1728                         {
1729                                 if ( rs->sr_err != LDAP_REFERRAL ) {
1730                                         Debug( LDAP_DEBUG_ANY,
1731                                                 "%s ldap_back_op_result: "
1732                                                 "got referrals with err=%d\n",
1733                                                 op->o_log_prefix,
1734                                                 rs->sr_err, 0 );
1735
1736                                 } else {
1737                                         int     i;
1738
1739                                         for ( i = 0; refs[ i ] != NULL; i++ )
1740                                                 /* count */ ;
1741                                         rs->sr_ref = op->o_tmpalloc( sizeof( struct berval ) * ( i + 1 ),
1742                                                 op->o_tmpmemctx );
1743                                         for ( i = 0; refs[ i ] != NULL; i++ ) {
1744                                                 ber_str2bv( refs[ i ], 0, 0, &rs->sr_ref[ i ] );
1745                                         }
1746                                         BER_BVZERO( &rs->sr_ref[ i ] );
1747                                 }
1748
1749                         } else if ( rs->sr_err == LDAP_REFERRAL ) {
1750                                 Debug( LDAP_DEBUG_ANY,
1751                                         "%s ldap_back_op_result: "
1752                                         "got err=%d with null "
1753                                         "or empty referrals\n",
1754                                         op->o_log_prefix,
1755                                         rs->sr_err, 0 );
1756
1757                                 rs->sr_err = LDAP_NO_SUCH_OBJECT;
1758                         }
1759
1760                         if ( ctrls != NULL ) {
1761                                 rs->sr_ctrls = ctrls;
1762                         }
1763                 }
1764         }
1765
1766         /* if the error in the reply structure is not
1767          * LDAP_SUCCESS, try to map it from client
1768          * to server error */
1769         if ( !ERR_OK( rs->sr_err ) ) {
1770                 rs->sr_err = slap_map_api2result( rs );
1771
1772                 /* internal ops ( op->o_conn == NULL )
1773                  * must not reply to client */
1774                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1775
1776                         /* record the (massaged) matched
1777                          * DN into the reply structure */
1778                         rs->sr_matched = match;
1779                 }
1780         }
1781
1782         if ( rs->sr_err == LDAP_UNAVAILABLE ) {
1783                 if ( !( sendok & LDAP_BACK_RETRYING ) ) {
1784                         if ( LDAP_BACK_QUARANTINE( li ) ) {
1785                                 ldap_back_quarantine( op, rs );
1786                         }
1787                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
1788                                 if ( rs->sr_text == NULL ) rs->sr_text = "Proxy operation retry failed";
1789                                 send_ldap_result( op, rs );
1790                         }
1791                 }
1792
1793         } else if ( op->o_conn &&
1794                 ( ( ( sendok & LDAP_BACK_SENDOK ) && ERR_OK( rs->sr_err ) )
1795                         || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1796         {
1797                 send_ldap_result( op, rs );
1798         }
1799
1800         if ( match ) {
1801                 if ( rs->sr_matched != match ) {
1802                         free( (char *)rs->sr_matched );
1803                 }
1804                 rs->sr_matched = NULL;
1805                 ldap_memfree( match );
1806         }
1807
1808         if ( text ) {
1809                 ldap_memfree( text );
1810         }
1811         rs->sr_text = NULL;
1812
1813         if ( rs->sr_ref ) {
1814                 op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
1815                 rs->sr_ref = NULL;
1816         }
1817
1818         if ( refs ) {
1819                 ber_memvfree( (void **)refs );
1820         }
1821
1822         if ( ctrls ) {
1823                 assert( rs->sr_ctrls != NULL );
1824                 ldap_controls_free( ctrls );
1825                 rs->sr_ctrls = NULL;
1826         }
1827
1828         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1829 }
1830
1831 /* return true if bound, false if failed */
1832 int
1833 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1834 {
1835         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1836         int             rc = 0;
1837
1838         assert( lcp != NULL );
1839         assert( *lcp != NULL );
1840
1841         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1842
1843         if ( (*lcp)->lc_refcnt == 1 ) {
1844                 int binding = LDAP_BACK_CONN_BINDING( *lcp );
1845
1846                 ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
1847                 Debug( LDAP_DEBUG_ANY,
1848                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1849                         op->o_log_prefix, li->li_uri,
1850                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1851                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1852                 ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
1853
1854                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1855                 (*lcp)->lc_ld = NULL;
1856                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1857
1858                 /* lc here must be the regular lc, reset and ready for init */
1859                 rc = ldap_back_prepare_conn( *lcp, op, rs, sendok );
1860                 if ( rc != LDAP_SUCCESS ) {
1861                         /* freeit, because lc_refcnt == 1 */
1862                         (*lcp)->lc_refcnt = 0;
1863                         (void)ldap_back_freeconn( li, *lcp, 0 );
1864                         *lcp = NULL;
1865                         rc = 0;
1866
1867                 } else if ( ( sendok & LDAP_BACK_BINDING ) ) {
1868                         if ( binding ) {
1869                                 LDAP_BACK_CONN_BINDING_SET( *lcp );
1870                         }
1871                         rc = 1;
1872
1873                 } else {
1874                         rc = ldap_back_dobind_int( lcp, op, rs, sendok, 0, 0 );
1875                         if ( rc == 0 && *lcp != NULL ) {
1876                                 /* freeit, because lc_refcnt == 1 */
1877                                 (*lcp)->lc_refcnt = 0;
1878                                 LDAP_BACK_CONN_TAINTED_SET( *lcp );
1879                                 (void)ldap_back_freeconn( li, *lcp, 0 );
1880                                 *lcp = NULL;
1881                         }
1882                 }
1883
1884         } else {
1885                 Debug( LDAP_DEBUG_TRACE,
1886                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1887                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1888
1889                 LDAP_BACK_CONN_TAINTED_SET( *lcp );
1890                 ldap_back_release_conn_lock( li, lcp, 0 );
1891                 assert( *lcp == NULL );
1892
1893                 if ( sendok & LDAP_BACK_SENDERR ) {
1894                         rs->sr_err = LDAP_UNAVAILABLE;
1895                         rs->sr_text = "Unable to retry";
1896                         send_ldap_result( op, rs );
1897                 }
1898         }
1899
1900         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1901
1902         return rc;
1903 }
1904
1905 static int
1906 ldap_back_is_proxy_authz( Operation *op, SlapReply *rs, ldap_back_send_t sendok,
1907         struct berval *binddn, struct berval *bindcred )
1908 {
1909         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1910         struct berval   ndn;
1911         int             dobind = 0;
1912
1913         if ( op->o_conn == NULL || op->o_do_not_cache ) {
1914                 goto done;
1915         }
1916
1917         /* don't proxyAuthz if protocol is not LDAPv3 */
1918         switch ( li->li_version ) {
1919         case LDAP_VERSION3:
1920                 break;
1921
1922         case 0:
1923                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
1924                         break;
1925                 }
1926                 /* fall thru */
1927
1928         default:
1929                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1930                 if ( sendok & LDAP_BACK_SENDERR ) {
1931                         send_ldap_result( op, rs );
1932                         dobind = -1;
1933                 }
1934                 goto done;
1935         }
1936
1937         /* safe default */
1938         *binddn = slap_empty_bv;
1939         *bindcred = slap_empty_bv;
1940
1941         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1942                 ndn = op->o_conn->c_ndn;
1943
1944         } else {
1945                 ndn = op->o_ndn;
1946         }
1947
1948         switch ( li->li_idassert_mode ) {
1949         case LDAP_BACK_IDASSERT_LEGACY:
1950                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1951                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1952                         {
1953                                 *binddn = li->li_idassert_authcDN;
1954                                 *bindcred = li->li_idassert_passwd;
1955                                 dobind = 1;
1956                         }
1957                 }
1958                 break;
1959
1960         default:
1961                 /* NOTE: rootdn can always idassert */
1962                 if ( BER_BVISNULL( &ndn )
1963                         && li->li_idassert_authz == NULL
1964                         && !( li->li_idassert_flags & LDAP_BACK_AUTH_AUTHZ_ALL ) )
1965                 {
1966                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1967                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1968                                 if ( sendok & LDAP_BACK_SENDERR ) {
1969                                         send_ldap_result( op, rs );
1970                                         dobind = -1;
1971                                 }
1972
1973                         } else {
1974                                 rs->sr_err = LDAP_SUCCESS;
1975                                 *binddn = slap_empty_bv;
1976                                 *bindcred = slap_empty_bv;
1977                                 break;
1978                         }
1979
1980                         goto done;
1981
1982                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1983                         struct berval authcDN;
1984
1985                         if ( BER_BVISNULL( &ndn ) ) {
1986                                 authcDN = slap_empty_bv;
1987
1988                         } else {
1989                                 authcDN = ndn;
1990                         }
1991                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1992                                         &authcDN, &authcDN );
1993                         if ( rs->sr_err != LDAP_SUCCESS ) {
1994                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1995                                         if ( sendok & LDAP_BACK_SENDERR ) {
1996                                                 send_ldap_result( op, rs );
1997                                                 dobind = -1;
1998                                         }
1999
2000                                 } else {
2001                                         rs->sr_err = LDAP_SUCCESS;
2002                                         *binddn = slap_empty_bv;
2003                                         *bindcred = slap_empty_bv;
2004                                         break;
2005                                 }
2006
2007                                 goto done;
2008                         }
2009                 }
2010
2011                 *binddn = li->li_idassert_authcDN;
2012                 *bindcred = li->li_idassert_passwd;
2013                 dobind = 1;
2014                 break;
2015         }
2016
2017 done:;
2018         return dobind;
2019 }
2020
2021 static int
2022 ldap_back_proxy_authz_bind(
2023         ldapconn_t              *lc,
2024         Operation               *op,
2025         SlapReply               *rs,
2026         ldap_back_send_t        sendok,
2027         struct berval           *binddn,
2028         struct berval           *bindcred )
2029 {
2030         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
2031         struct berval   ndn;
2032         int             msgid;
2033         int             rc;
2034
2035         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
2036                 ndn = op->o_conn->c_ndn;
2037
2038         } else {
2039                 ndn = op->o_ndn;
2040         }
2041
2042         if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
2043 #ifdef HAVE_CYRUS_SASL
2044                 void            *defaults = NULL;
2045                 struct berval   authzID = BER_BVNULL;
2046                 int             freeauthz = 0;
2047
2048                 /* if SASL supports native authz, prepare for it */
2049                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
2050                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
2051                 {
2052                         switch ( li->li_idassert_mode ) {
2053                         case LDAP_BACK_IDASSERT_OTHERID:
2054                         case LDAP_BACK_IDASSERT_OTHERDN:
2055                                 authzID = li->li_idassert_authzID;
2056                                 break;
2057
2058                         case LDAP_BACK_IDASSERT_ANONYMOUS:
2059                                 BER_BVSTR( &authzID, "dn:" );
2060                                 break;
2061
2062                         case LDAP_BACK_IDASSERT_SELF:
2063                                 if ( BER_BVISNULL( &ndn ) ) {
2064                                         /* connection is not authc'd, so don't idassert */
2065                                         BER_BVSTR( &authzID, "dn:" );
2066                                         break;
2067                                 }
2068                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
2069                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
2070                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
2071                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
2072                                                 ndn.bv_val, ndn.bv_len + 1 );
2073                                 freeauthz = 1;
2074                                 break;
2075
2076                         default:
2077                                 break;
2078                         }
2079                 }
2080
2081                 if ( li->li_idassert_secprops != NULL ) {
2082                         rs->sr_err = ldap_set_option( lc->lc_ld,
2083                                 LDAP_OPT_X_SASL_SECPROPS,
2084                                 (void *)li->li_idassert_secprops );
2085
2086                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
2087                                 rs->sr_err = LDAP_OTHER;
2088                                 if ( sendok & LDAP_BACK_SENDERR ) {
2089                                         send_ldap_result( op, rs );
2090                                 }
2091                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
2092                                 goto done;
2093                         }
2094                 }
2095
2096                 defaults = lutil_sasl_defaults( lc->lc_ld,
2097                                 li->li_idassert_sasl_mech.bv_val,
2098                                 li->li_idassert_sasl_realm.bv_val,
2099                                 li->li_idassert_authcID.bv_val,
2100                                 li->li_idassert_passwd.bv_val,
2101                                 authzID.bv_val );
2102                 if ( defaults == NULL ) {
2103                         rs->sr_err = LDAP_OTHER;
2104                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
2105                         if ( sendok & LDAP_BACK_SENDERR ) {
2106                                 send_ldap_result( op, rs );
2107                         }
2108                         goto done;
2109                 }
2110
2111                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn->bv_val,
2112                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
2113                                 LDAP_SASL_QUIET, lutil_sasl_interact,
2114                                 defaults );
2115
2116                 rs->sr_err = slap_map_api2result( rs );
2117                 if ( rs->sr_err != LDAP_SUCCESS ) {
2118                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
2119                         if ( sendok & LDAP_BACK_SENDERR ) {
2120                                 send_ldap_result( op, rs );
2121                         }
2122
2123                 } else {
2124                         LDAP_BACK_CONN_ISBOUND_SET( lc );
2125                 }
2126
2127                 lutil_sasl_freedefs( defaults );
2128                 if ( freeauthz ) {
2129                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
2130                 }
2131
2132                 goto done;
2133 #endif /* HAVE_CYRUS_SASL */
2134         }
2135
2136         switch ( li->li_idassert_authmethod ) {
2137         case LDAP_AUTH_NONE:
2138                 /* FIXME: do we really need this? */
2139                 BER_BVSTR( binddn, "" );
2140                 BER_BVSTR( bindcred, "" );
2141                 /* fallthru */
2142
2143         case LDAP_AUTH_SIMPLE:
2144                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
2145                                 binddn->bv_val, LDAP_SASL_SIMPLE,
2146                                 bindcred, NULL, NULL, &msgid );
2147                 rc = ldap_back_op_result( lc, op, rs, msgid,
2148                         -1, ( sendok | LDAP_BACK_BINDING ) );
2149                 break;
2150
2151         default:
2152                 /* unsupported! */
2153                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
2154                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
2155                 if ( sendok & LDAP_BACK_SENDERR ) {
2156                         send_ldap_result( op, rs );
2157                 }
2158                 goto done;
2159         }
2160
2161         if ( rc == LDAP_SUCCESS ) {
2162                 /* set rebind stuff in case of successful proxyAuthz bind,
2163                  * so that referral chasing is attempted using the right
2164                  * identity */
2165                 LDAP_BACK_CONN_ISBOUND_SET( lc );
2166                 ber_bvreplace( &lc->lc_bound_ndn, binddn );
2167
2168                 if ( !BER_BVISNULL( &lc->lc_cred ) ) {
2169                         memset( lc->lc_cred.bv_val, 0,
2170                                         lc->lc_cred.bv_len );
2171                 }
2172
2173                 if ( LDAP_BACK_SAVECRED( li ) ) {
2174                         ber_bvreplace( &lc->lc_cred, bindcred );
2175                         ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
2176
2177                 } else {
2178                         lc->lc_cred.bv_len = 0;
2179                 }
2180         }
2181 done:;
2182         return LDAP_BACK_CONN_ISBOUND( lc );
2183 }
2184
2185 /*
2186  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
2187  * to existing server-side controls if required; if not,
2188  * the existing server-side controls are placed in *pctrls.
2189  * The caller, after using the controls in client API
2190  * operations, if ( *pctrls != op->o_ctrls ), should
2191  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
2192  * The function returns success if the control could
2193  * be added if required, or if it did nothing; in the future,
2194  * it might return some error if it failed.
2195  *
2196  * if no bind took place yet, but the connection is bound
2197  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
2198  * and explicitly add proxyAuthz the control to every operation
2199  * with the dn bound to the connection as control value.
2200  *
2201  * If no server-side controls are defined for the operation,
2202  * simply add the proxyAuthz control; otherwise, if the
2203  * proxyAuthz control is not already set, add it as
2204  * the first one
2205  *
2206  * FIXME: is controls order significant for security?
2207  * ANSWER: controls ordering and interoperability
2208  * must be indicated by the specs of each control; if none
2209  * is specified, the order is irrelevant.
2210  */
2211 int
2212 ldap_back_proxy_authz_ctrl(
2213                 struct berval   *bound_ndn,
2214                 int             version,
2215                 slap_idassert_t *si,
2216                 Operation       *op,
2217                 SlapReply       *rs,
2218                 LDAPControl     ***pctrls )
2219 {
2220         LDAPControl             **ctrls = NULL;
2221         int                     i = 0;
2222         slap_idassert_mode_t    mode;
2223         struct berval           assertedID,
2224                                 ndn;
2225         int                     isroot = 0;
2226
2227         *pctrls = NULL;
2228
2229         rs->sr_err = LDAP_SUCCESS;
2230
2231         /* don't proxyAuthz if protocol is not LDAPv3 */
2232         switch ( version ) {
2233         case LDAP_VERSION3:
2234                 break;
2235
2236         case 0:
2237                 if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
2238                         break;
2239                 }
2240                 /* fall thru */
2241
2242         default:
2243                 goto done;
2244         }
2245
2246         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
2247          * but if it is not set this test fails.  We need a different
2248          * means to detect if idassert is enabled */
2249         if ( ( BER_BVISNULL( &si->si_bc.sb_authcId ) || BER_BVISEMPTY( &si->si_bc.sb_authcId ) )
2250                         && ( BER_BVISNULL( &si->si_bc.sb_binddn ) || BER_BVISEMPTY( &si->si_bc.sb_binddn ) ) )
2251         {
2252                 goto done;
2253         }
2254
2255         if ( !op->o_conn || op->o_do_not_cache || ( isroot = be_isroot( op ) ) ) {
2256                 goto done;
2257         }
2258
2259         if ( op->o_tag == LDAP_REQ_BIND ) {
2260                 ndn = op->o_req_ndn;
2261
2262         } else if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
2263                 ndn = op->o_conn->c_ndn;
2264
2265         } else {
2266                 ndn = op->o_ndn;
2267         }
2268
2269         if ( si->si_mode == LDAP_BACK_IDASSERT_LEGACY ) {
2270                 if ( op->o_proxy_authz ) {
2271                         /*
2272                          * FIXME: we do not want to perform proxyAuthz
2273                          * on behalf of the client, because this would
2274                          * be performed with "proxyauthzdn" privileges.
2275                          *
2276                          * This might actually be too strict, since
2277                          * the "proxyauthzdn" authzTo, and each entry's
2278                          * authzFrom attributes may be crafted
2279                          * to avoid unwanted proxyAuthz to take place.
2280                          */
2281 #if 0
2282                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2283                         rs->sr_text = "proxyAuthz not allowed within namingContext";
2284 #endif
2285                         goto done;
2286                 }
2287
2288                 if ( !BER_BVISNULL( bound_ndn ) ) {
2289                         goto done;
2290                 }
2291
2292                 if ( BER_BVISNULL( &ndn ) ) {
2293                         goto done;
2294                 }
2295
2296                 if ( BER_BVISNULL( &si->si_bc.sb_binddn ) ) {
2297                         goto done;
2298                 }
2299
2300         } else if ( si->si_bc.sb_method == LDAP_AUTH_SASL ) {
2301                 if ( ( si->si_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
2302                 {
2303                         /* already asserted in SASL via native authz */
2304                         goto done;
2305                 }
2306
2307         } else if ( si->si_authz && !isroot ) {
2308                 int             rc;
2309                 struct berval authcDN;
2310
2311                 if ( BER_BVISNULL( &ndn ) ) {
2312                         authcDN = slap_empty_bv;
2313                 } else {
2314                         authcDN = ndn;
2315                 }
2316                 rc = slap_sasl_matches( op, si->si_authz,
2317                                 &authcDN, & authcDN );
2318                 if ( rc != LDAP_SUCCESS ) {
2319                         if ( si->si_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
2320                                 /* ndn is not authorized
2321                                  * to use idassert */
2322                                 rs->sr_err = rc;
2323                         }
2324                         goto done;
2325                 }
2326         }
2327
2328         if ( op->o_proxy_authz ) {
2329                 /*
2330                  * FIXME: we can:
2331                  * 1) ignore the already set proxyAuthz control
2332                  * 2) leave it in place, and don't set ours
2333                  * 3) add both
2334                  * 4) reject the operation
2335                  *
2336                  * option (4) is very drastic
2337                  * option (3) will make the remote server reject
2338                  * the operation, thus being equivalent to (4)
2339                  * option (2) will likely break the idassert
2340                  * assumptions, so we cannot accept it;
2341                  * option (1) means that we are contradicting
2342                  * the client's reques.
2343                  *
2344                  * I think (4) is the only correct choice.
2345                  */
2346                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2347                 rs->sr_text = "proxyAuthz not allowed within namingContext";
2348         }
2349
2350         if ( op->o_is_auth_check ) {
2351                 mode = LDAP_BACK_IDASSERT_NOASSERT;
2352
2353         } else {
2354                 mode = si->si_mode;
2355         }
2356
2357         switch ( mode ) {
2358         case LDAP_BACK_IDASSERT_LEGACY:
2359                 /* original behavior:
2360                  * assert the client's identity */
2361         case LDAP_BACK_IDASSERT_SELF:
2362                 assertedID = ndn;
2363                 break;
2364
2365         case LDAP_BACK_IDASSERT_ANONYMOUS:
2366                 /* assert "anonymous" */
2367                 assertedID = slap_empty_bv;
2368                 break;
2369
2370         case LDAP_BACK_IDASSERT_NOASSERT:
2371                 /* don't assert; bind as proxyauthzdn */
2372                 goto done;
2373
2374         case LDAP_BACK_IDASSERT_OTHERID:
2375         case LDAP_BACK_IDASSERT_OTHERDN:
2376                 /* assert idassert DN */
2377                 assertedID = si->si_bc.sb_authzId;
2378                 break;
2379
2380         default:
2381                 assert( 0 );
2382         }
2383
2384         /* if we got here, "" is allowed to proxyAuthz */
2385         if ( BER_BVISNULL( &assertedID ) ) {
2386                 assertedID = slap_empty_bv;
2387         }
2388
2389         /* don't idassert the bound DN (ITS#4497) */
2390         if ( dn_match( &assertedID, bound_ndn ) ) {
2391                 goto done;
2392         }
2393
2394         if ( op->o_ctrls ) {
2395                 for ( i = 0; op->o_ctrls[ i ]; i++ )
2396                         /* just count ctrls */ ;
2397         }
2398
2399         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
2400                         op->o_tmpmemctx );
2401         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
2402
2403         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
2404         ctrls[ 0 ]->ldctl_iscritical = 1;
2405
2406         switch ( si->si_mode ) {
2407         /* already in u:ID or dn:DN form */
2408         case LDAP_BACK_IDASSERT_OTHERID:
2409         case LDAP_BACK_IDASSERT_OTHERDN:
2410                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
2411                 break;
2412
2413         /* needs the dn: prefix */
2414         default:
2415                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
2416                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
2417                                 op->o_tmpmemctx );
2418                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
2419                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
2420                                 assertedID.bv_val, assertedID.bv_len + 1 );
2421                 break;
2422         }
2423
2424         /* Older versions of <draft-weltman-ldapv3-proxy> required
2425          * to encode the value of the authzID (and called it proxyDN);
2426          * this hack provides compatibility with those DSAs that
2427          * implement it this way */
2428         if ( si->si_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
2429                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
2430                 BerElementBuffer        berbuf;
2431                 BerElement              *ber = (BerElement *)&berbuf;
2432                 ber_tag_t               tag;
2433
2434                 ber_init2( ber, 0, LBER_USE_DER );
2435                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
2436
2437                 tag = ber_printf( ber, "O", &authzID );
2438                 if ( tag == LBER_ERROR ) {
2439                         rs->sr_err = LDAP_OTHER;
2440                         goto free_ber;
2441                 }
2442
2443                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
2444                         rs->sr_err = LDAP_OTHER;
2445                         goto free_ber;
2446                 }
2447
2448 free_ber:;
2449                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
2450                 ber_free_buf( ber );
2451
2452                 if ( rs->sr_err != LDAP_SUCCESS ) {
2453                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2454                         ctrls = NULL;
2455                         goto done;
2456                 }
2457
2458         } else if ( si->si_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
2459                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
2460                                         tmp;
2461                 BerElementBuffer        berbuf;
2462                 BerElement              *ber = (BerElement *)&berbuf;
2463                 ber_tag_t               tag;
2464
2465                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
2466                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2467                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2468                         ctrls = NULL;
2469                         rs->sr_err = LDAP_PROTOCOL_ERROR;
2470                         goto done;
2471                 }
2472
2473                 tmp = authzID;
2474                 tmp.bv_val += STRLENOF( "dn:" );
2475                 tmp.bv_len -= STRLENOF( "dn:" );
2476
2477                 ber_init2( ber, 0, LBER_USE_DER );
2478                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
2479
2480                 /* apparently, Mozilla API encodes this
2481                  * as "SEQUENCE { LDAPDN }" */
2482                 tag = ber_printf( ber, "{O}", &tmp );
2483                 if ( tag == LBER_ERROR ) {
2484                         rs->sr_err = LDAP_OTHER;
2485                         goto free_ber2;
2486                 }
2487
2488                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
2489                         rs->sr_err = LDAP_OTHER;
2490                         goto free_ber2;
2491                 }
2492
2493 free_ber2:;
2494                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
2495                 ber_free_buf( ber );
2496
2497                 if ( rs->sr_err != LDAP_SUCCESS ) {
2498                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
2499                         ctrls = NULL;
2500                         goto done;
2501                 }
2502
2503                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
2504         }
2505
2506         if ( op->o_ctrls ) {
2507                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
2508                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
2509                 }
2510         }
2511         ctrls[ i + 1 ] = NULL;
2512
2513 done:;
2514         if ( ctrls == NULL ) {
2515                 ctrls = op->o_ctrls;
2516         }
2517
2518         *pctrls = ctrls;
2519
2520         return rs->sr_err;
2521 }
2522
2523 int
2524 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
2525 {
2526         LDAPControl     **ctrls = *pctrls;
2527
2528         /* we assume that the first control is the proxyAuthz
2529          * added by back-ldap, so it's the only one we explicitly
2530          * free */
2531         if ( ctrls && ctrls != op->o_ctrls ) {
2532                 assert( ctrls[ 0 ] != NULL );
2533
2534                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
2535                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
2536                 }
2537
2538                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
2539         }
2540
2541         *pctrls = NULL;
2542
2543         return 0;
2544 }