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

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