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                         rs->sr_text = text;
1047                         if ( rc != LDAP_SUCCESS ) {
1048                                 rs->sr_err = rc;
1049                         }
1050                 }
1051         }
1052
1053         /* if the error in the reply structure is not
1054          * LDAP_SUCCESS, try to map it from client
1055          * to server error */
1056         if ( !ERR_OK( rs->sr_err ) ) {
1057                 rs->sr_err = slap_map_api2result( rs );
1058
1059                 /* internal ops ( op->o_conn == NULL )
1060                  * must not reply to client */
1061                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1062
1063                         /* record the (massaged) matched
1064                          * DN into the reply structure */
1065                         rs->sr_matched = match;
1066                 }
1067         }
1068         if ( op->o_conn &&
1069                         ( ( sendok & LDAP_BACK_SENDOK )
1070                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1071         {
1072                 send_ldap_result( op, rs );
1073         }
1074         if ( match ) {
1075                 if ( rs->sr_matched != match ) {
1076                         free( (char *)rs->sr_matched );
1077                 }
1078                 rs->sr_matched = NULL;
1079                 ldap_memfree( match );
1080         }
1081         if ( text ) {
1082                 ldap_memfree( text );
1083         }
1084         rs->sr_text = NULL;
1085         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1086 }
1087
1088 /* return true if bound, false if failed */
1089 int
1090 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1091 {
1092         int             rc = 0;
1093         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1094
1095         assert( lcp != NULL );
1096         assert( *lcp != NULL );
1097
1098         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1099
1100         if ( (*lcp)->lc_refcnt == 1 ) {
1101                 Debug( LDAP_DEBUG_ANY,
1102                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1103                         op->o_log_prefix, li->li_uri,
1104                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1105                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1106
1107                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1108                 (*lcp)->lc_ld = NULL;
1109                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1110
1111                 /* lc here must be the regular lc, reset and ready for init */
1112                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1113                 if ( rc != LDAP_SUCCESS ) {
1114                         rc = 0;
1115                         *lcp = NULL;
1116
1117                 } else {
1118                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1119                         if ( rc == 0 ) {
1120                                 *lcp = NULL;
1121                         }
1122                 }
1123
1124         } else {
1125                 Debug( LDAP_DEBUG_TRACE,
1126                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1127                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1128
1129                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1130                 *lcp = NULL;
1131
1132                 if ( sendok ) {
1133                         rs->sr_err = LDAP_UNAVAILABLE;
1134                         rs->sr_text = "unable to retry";
1135                         send_ldap_result( op, rs );
1136                 }
1137         }
1138
1139         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1140
1141         return rc;
1142 }
1143
1144 static int
1145 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1146 {
1147         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1148         struct berval   binddn = slap_empty_bv;
1149         struct berval   bindcred = slap_empty_bv;
1150         struct berval   ndn;
1151         int             dobind = 0;
1152         int             msgid;
1153         int             rc;
1154
1155         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1156                 ndn = op->o_conn->c_ndn;
1157
1158         } else {
1159                 ndn = op->o_ndn;
1160         }
1161
1162         /*
1163          * FIXME: we need to let clients use proxyAuthz
1164          * otherwise we cannot do symmetric pools of servers;
1165          * we have to live with the fact that a user can
1166          * authorize itself as any ID that is allowed
1167          * by the authzTo directive of the "proxyauthzdn".
1168          */
1169         /*
1170          * NOTE: current Proxy Authorization specification
1171          * and implementation do not allow proxy authorization
1172          * control to be provided with Bind requests
1173          */
1174         /*
1175          * if no bind took place yet, but the connection is bound
1176          * and the "proxyauthzdn" is set, then bind as
1177          * "proxyauthzdn" and explicitly add the proxyAuthz
1178          * control to every operation with the dn bound
1179          * to the connection as control value.
1180          */
1181
1182         /* bind as proxyauthzdn only if no idassert mode
1183          * is requested, or if the client's identity
1184          * is authorized */
1185         switch ( li->li_idassert_mode ) {
1186         case LDAP_BACK_IDASSERT_LEGACY:
1187                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1188                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1189                         {
1190                                 binddn = li->li_idassert_authcDN;
1191                                 bindcred = li->li_idassert_passwd;
1192                                 dobind = 1;
1193                         }
1194                 }
1195                 break;
1196
1197         default:
1198                 /* NOTE: rootdn can always idassert */
1199                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1200                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1201                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1202                                 if ( sendok & LDAP_BACK_SENDERR ) {
1203                                         send_ldap_result( op, rs );
1204                                 }
1205                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1206
1207                         } else {
1208                                 rs->sr_err = LDAP_SUCCESS;
1209                                 binddn = slap_empty_bv;
1210                                 bindcred = slap_empty_bv;
1211                                 break;
1212                         }
1213
1214                         goto done;
1215
1216                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1217                         struct berval authcDN;
1218
1219                         if ( BER_BVISNULL( &ndn ) ) {
1220                                 authcDN = slap_empty_bv;
1221
1222                         } else {
1223                                 authcDN = ndn;
1224                         }
1225                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1226                                         &authcDN, &authcDN );
1227                         if ( rs->sr_err != LDAP_SUCCESS ) {
1228                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1229                                         if ( sendok & LDAP_BACK_SENDERR ) {
1230                                                 send_ldap_result( op, rs );
1231                                         }
1232                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1233
1234                                 } else {
1235                                         rs->sr_err = LDAP_SUCCESS;
1236                                         binddn = slap_empty_bv;
1237                                         bindcred = slap_empty_bv;
1238                                         break;
1239                                 }
1240
1241                                 goto done;
1242                         }
1243                 }
1244
1245                 binddn = li->li_idassert_authcDN;
1246                 bindcred = li->li_idassert_passwd;
1247                 dobind = 1;
1248                 break;
1249         }
1250
1251         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1252 #ifdef HAVE_CYRUS_SASL
1253                 void            *defaults = NULL;
1254                 struct berval   authzID = BER_BVNULL;
1255                 int             freeauthz = 0;
1256
1257                 /* if SASL supports native authz, prepare for it */
1258                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1259                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1260                 {
1261                         switch ( li->li_idassert_mode ) {
1262                         case LDAP_BACK_IDASSERT_OTHERID:
1263                         case LDAP_BACK_IDASSERT_OTHERDN:
1264                                 authzID = li->li_idassert_authzID;
1265                                 break;
1266
1267                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1268                                 BER_BVSTR( &authzID, "dn:" );
1269                                 break;
1270
1271                         case LDAP_BACK_IDASSERT_SELF:
1272                                 if ( BER_BVISNULL( &ndn ) ) {
1273                                         /* connection is not authc'd, so don't idassert */
1274                                         BER_BVSTR( &authzID, "dn:" );
1275                                         break;
1276                                 }
1277                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1278                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1279                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1280                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1281                                                 ndn.bv_val, ndn.bv_len + 1 );
1282                                 freeauthz = 1;
1283                                 break;
1284
1285                         default:
1286                                 break;
1287                         }
1288                 }
1289
1290                 if ( li->li_idassert_secprops != NULL ) {
1291                         rs->sr_err = ldap_set_option( lc->lc_ld,
1292                                 LDAP_OPT_X_SASL_SECPROPS,
1293                                 (void *)li->li_idassert_secprops );
1294
1295                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1296                                 rs->sr_err = LDAP_OTHER;
1297                                 if ( sendok & LDAP_BACK_SENDERR ) {
1298                                         send_ldap_result( op, rs );
1299                                 }
1300                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1301                                 goto done;
1302                         }
1303                 }
1304
1305                 defaults = lutil_sasl_defaults( lc->lc_ld,
1306                                 li->li_idassert_sasl_mech.bv_val,
1307                                 li->li_idassert_sasl_realm.bv_val,
1308                                 li->li_idassert_authcID.bv_val,
1309                                 li->li_idassert_passwd.bv_val,
1310                                 authzID.bv_val );
1311
1312                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1313                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1314                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1315                                 defaults );
1316
1317                 rs->sr_err = slap_map_api2result( rs );
1318                 if ( rs->sr_err != LDAP_SUCCESS ) {
1319                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1320                         if ( sendok & LDAP_BACK_SENDERR ) {
1321                                 send_ldap_result( op, rs );
1322                         }
1323
1324                 } else {
1325                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1326                 }
1327
1328                 lutil_sasl_freedefs( defaults );
1329                 if ( freeauthz ) {
1330                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1331                 }
1332
1333                 goto done;
1334 #endif /* HAVE_CYRUS_SASL */
1335         }
1336
1337         switch ( li->li_idassert_authmethod ) {
1338         case LDAP_AUTH_NONE:
1339                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1340                 goto done;
1341
1342         case LDAP_AUTH_SIMPLE:
1343                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1344                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1345                                 &bindcred, NULL, NULL, &msgid );
1346                 break;
1347
1348         default:
1349                 /* unsupported! */
1350                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1351                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1352                 if ( sendok & LDAP_BACK_SENDERR ) {
1353                         send_ldap_result( op, rs );
1354                 }
1355                 goto done;
1356         }
1357
1358         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1359         if ( rc == LDAP_SUCCESS ) {
1360                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1361         }
1362 done:;
1363         return LDAP_BACK_CONN_ISBOUND( lc );
1364 }
1365
1366 /*
1367  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1368  * to existing server-side controls if required; if not,
1369  * the existing server-side controls are placed in *pctrls.
1370  * The caller, after using the controls in client API
1371  * operations, if ( *pctrls != op->o_ctrls ), should
1372  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1373  * The function returns success if the control could
1374  * be added if required, or if it did nothing; in the future,
1375  * it might return some error if it failed.
1376  *
1377  * if no bind took place yet, but the connection is bound
1378  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1379  * and explicitly add proxyAuthz the control to every operation
1380  * with the dn bound to the connection as control value.
1381  *
1382  * If no server-side controls are defined for the operation,
1383  * simply add the proxyAuthz control; otherwise, if the
1384  * proxyAuthz control is not already set, add it as
1385  * the first one
1386  *
1387  * FIXME: is controls order significant for security?
1388  * ANSWER: controls ordering and interoperability
1389  * must be indicated by the specs of each control; if none
1390  * is specified, the order is irrelevant.
1391  */
1392 int
1393 ldap_back_proxy_authz_ctrl(
1394                 ldapconn_t      *lc,
1395                 Operation       *op,
1396                 SlapReply       *rs,
1397                 LDAPControl     ***pctrls )
1398 {
1399         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1400         LDAPControl     **ctrls = NULL;
1401         int             i = 0,
1402                         mode;
1403         struct berval   assertedID,
1404                         ndn;
1405
1406         *pctrls = NULL;
1407
1408         rs->sr_err = LDAP_SUCCESS;
1409
1410         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1411          * but if it is not set this test fails.  We need a different
1412          * means to detect if idassert is enabled */
1413         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1414                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1415         {
1416                 goto done;
1417         }
1418
1419         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1420                 goto done;
1421         }
1422
1423         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1424                 ndn = op->o_conn->c_ndn;
1425
1426         } else {
1427                 ndn = op->o_ndn;
1428         }
1429
1430         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1431                 if ( op->o_proxy_authz ) {
1432                         /*
1433                          * FIXME: we do not want to perform proxyAuthz
1434                          * on behalf of the client, because this would
1435                          * be performed with "proxyauthzdn" privileges.
1436                          *
1437                          * This might actually be too strict, since
1438                          * the "proxyauthzdn" authzTo, and each entry's
1439                          * authzFrom attributes may be crafted
1440                          * to avoid unwanted proxyAuthz to take place.
1441                          */
1442 #if 0
1443                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1444                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1445 #endif
1446                         goto done;
1447                 }
1448
1449                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1450                         goto done;
1451                 }
1452
1453                 if ( BER_BVISNULL( &ndn ) ) {
1454                         goto done;
1455                 }
1456
1457                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1458                         goto done;
1459                 }
1460
1461         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1462                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1463                                 /* && ( !BER_BVISNULL( &ndn )
1464                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1465                 {
1466                         /* already asserted in SASL via native authz */
1467                         /* NOTE: the test on lc->lc_bound is used to trap
1468                          * native authorization of anonymous users,
1469                          * since in that case ndn is NULL */
1470                         goto done;
1471                 }
1472
1473         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1474                 int             rc;
1475                 struct berval authcDN;
1476
1477                 if ( BER_BVISNULL( &ndn ) ) {
1478                         authcDN = slap_empty_bv;
1479                 } else {
1480                         authcDN = ndn;
1481                 }
1482                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1483                                 &authcDN, & authcDN );
1484                 if ( rc != LDAP_SUCCESS ) {
1485                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1486                         {
1487                                 /* ndn is not authorized
1488                                  * to use idassert */
1489                                 rs->sr_err = rc;
1490                         }
1491                         goto done;
1492                 }
1493         }
1494
1495         if ( op->o_proxy_authz ) {
1496                 /*
1497                  * FIXME: we can:
1498                  * 1) ignore the already set proxyAuthz control
1499                  * 2) leave it in place, and don't set ours
1500                  * 3) add both
1501                  * 4) reject the operation
1502                  *
1503                  * option (4) is very drastic
1504                  * option (3) will make the remote server reject
1505                  * the operation, thus being equivalent to (4)
1506                  * option (2) will likely break the idassert
1507                  * assumptions, so we cannot accept it;
1508                  * option (1) means that we are contradicting
1509                  * the client's reques.
1510                  *
1511                  * I think (4) is the only correct choice.
1512                  */
1513                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1514                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1515         }
1516
1517         if ( op->o_is_auth_check ) {
1518                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1519
1520         } else {
1521                 mode = li->li_idassert_mode;
1522         }
1523
1524         switch ( mode ) {
1525         case LDAP_BACK_IDASSERT_SELF:
1526                 if ( BER_BVISNULL( &ndn ) ) {
1527                         goto done;
1528                 }
1529                 assertedID = ndn;
1530                 break;
1531
1532         case LDAP_BACK_IDASSERT_LEGACY:
1533                 /* original behavior:
1534                  * assert the client's identity */
1535                 if ( BER_BVISNULL( &ndn ) ) {
1536                         assertedID = slap_empty_bv;
1537                 } else {
1538                         assertedID = ndn;
1539                 }
1540                 break;
1541
1542         case LDAP_BACK_IDASSERT_ANONYMOUS:
1543                 /* assert "anonymous" */
1544                 assertedID = slap_empty_bv;
1545                 break;
1546
1547         case LDAP_BACK_IDASSERT_NOASSERT:
1548                 /* don't assert; bind as proxyauthzdn */
1549                 goto done;
1550
1551         case LDAP_BACK_IDASSERT_OTHERID:
1552         case LDAP_BACK_IDASSERT_OTHERDN:
1553                 /* assert idassert DN */
1554                 assertedID = li->li_idassert_authzID;
1555                 break;
1556
1557         default:
1558                 assert( 0 );
1559         }
1560
1561         if ( BER_BVISNULL( &assertedID ) ) {
1562                 assertedID = slap_empty_bv;
1563         }
1564
1565         if ( op->o_ctrls ) {
1566                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1567                         /* just count ctrls */ ;
1568         }
1569
1570         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1571                         op->o_tmpmemctx );
1572         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1573
1574         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1575         ctrls[ 0 ]->ldctl_iscritical = 1;
1576
1577         switch ( li->li_idassert_mode ) {
1578         /* already in u:ID or dn:DN form */
1579         case LDAP_BACK_IDASSERT_OTHERID:
1580         case LDAP_BACK_IDASSERT_OTHERDN:
1581                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1582                 break;
1583
1584         /* needs the dn: prefix */
1585         default:
1586                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1587                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1588                                 op->o_tmpmemctx );
1589                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1590                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1591                                 assertedID.bv_val, assertedID.bv_len + 1 );
1592                 break;
1593         }
1594
1595         if ( op->o_ctrls ) {
1596                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1597                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1598                 }
1599         }
1600         ctrls[ i + 1 ] = NULL;
1601
1602 done:;
1603         if ( ctrls == NULL ) {
1604                 ctrls = op->o_ctrls;
1605         }
1606
1607         *pctrls = ctrls;
1608
1609         return rs->sr_err;
1610 }
1611
1612 int
1613 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1614 {
1615         LDAPControl     **ctrls = *pctrls;
1616
1617         /* we assume that the first control is the proxyAuthz
1618          * added by back-ldap, so it's the only one we explicitly
1619          * free */
1620         if ( ctrls && ctrls != op->o_ctrls ) {
1621                 assert( ctrls[ 0 ] != NULL );
1622
1623                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1624                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1625                 }
1626
1627                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
1628         }
1629
1630         *pctrls = NULL;
1631
1632         return 0;
1633 }