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 1999-2005 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 #define PRINT_CONNTREE 0
  39
  40 static LDAP_REBIND_PROC ldap_back_default_rebind;
  41
  42 LDAP_REBIND_PROC        *ldap_back_rebind_f = ldap_back_default_rebind;
  43
  44 static int
  45 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs );
  46
  47 static int
  48 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
  49
  50 int
  51 ldap_back_bind( Operation *op, SlapReply *rs )
  52 {
  53         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
  54         ldapconn_t      *lc;
  55
  56         int rc = 0;
  57         ber_int_t msgid;
  58
  59         lc = ldap_back_getconn( op, rs, LDAP_BACK_SENDERR );
  60         if ( !lc ) {
  61                 return rs->sr_err;
  62         }
  63
  64         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
  65                 ch_free( lc->lc_bound_ndn.bv_val );
  66                 BER_BVZERO( &lc->lc_bound_ndn );
  67         }
  68         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
  69
  70         /* method is always LDAP_AUTH_SIMPLE if we got here */
  71         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
  72                         LDAP_SASL_SIMPLE,
  73                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
  74         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
  75
  76         if ( rc == LDAP_SUCCESS ) {
  77                 /* If defined, proxyAuthz will be used also when
  78                  * back-ldap is the authorizing backend; for this
  79                  * purpose, a successful bind is followed by a
  80                  * bind with the configured identity assertion */
  81                 /* NOTE: use with care */
  82                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
  83                         ldap_back_proxy_authz_bind( lc, op, rs );
  84                         if ( !LDAP_BACK_CONN_ISBOUND( lc ) ) {
  85                                 rc = 1;
  86                                 goto done;
  87                         }
  88                 }
  89
  90                 LDAP_BACK_CONN_ISBOUND_SET( lc );
  91                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
  92
  93                 if ( LDAP_BACK_SAVECRED( li ) ) {
  94                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
  95                                 memset( lc->lc_cred.bv_val, 0,
  96                                                 lc->lc_cred.bv_len );
  97                         }
  98                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
  99                         ldap_set_rebind_proc( lc->lc_ld, ldap_back_rebind_f, lc );
 100                 }
 101         }
 102 done:;
 103
 104         /* must re-insert if local DN changed as result of bind */
 105         if ( LDAP_BACK_CONN_ISBOUND( lc )
 106                 && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) )
 107         {
 108                 int             lerr;
 109
 110                 /* wait for all other ops to release the connection */
 111 retry_lock:;
 112                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 113                 if ( lc->lc_refcnt > 1 ) {
 114                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 115                         ldap_pvt_thread_yield();
 116                         goto retry_lock;
 117                 }
 118
 119                 assert( lc->lc_refcnt == 1 );
 120                 lc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 121                                 ldap_back_conn_cmp );
 122                 assert( lc != NULL );
 123
 124                 ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 125                 lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 126                         ldap_back_conn_cmp, ldap_back_conn_dup );
 127                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 128                 if ( lerr == -1 ) {
 129                         /* we can do this because lc_refcnt == 1 */
 130                         ldap_back_conn_free( lc );
 131                         lc = NULL;
 132                 }
 133         }
 134
 135         if ( lc != NULL ) {
 136                 ldap_back_release_conn( op, rs, lc );
 137         }
 138
 139         return( rc );
 140 }
 141
 142 /*
 143  * ldap_back_conn_cmp
 144  *
 145  * compares two ldapconn_t based on the value of the conn pointer;
 146  * used by avl stuff
 147  */
 148 int
 149 ldap_back_conn_cmp( const void *c1, const void *c2 )
 150 {
 151         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 152         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 153         int rc;
 154
 155         /* If local DNs don't match, it is definitely not a match */
 156         rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 157         if ( rc ) {
 158                 return rc;
 159         }
 160
 161         /* For shared sessions, conn is NULL. Only explicitly
 162          * bound sessions will have non-NULL conn.
 163          */
 164         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 165 }
 166
 167 /*
 168  * ldap_back_conn_dup
 169  *
 170  * returns -1 in case a duplicate ldapconn_t has been inserted;
 171  * used by avl stuff
 172  */
 173 int
 174 ldap_back_conn_dup( void *c1, void *c2 )
 175 {
 176         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 177         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 178
 179         /* Cannot have more than one shared session with same DN */
 180         if ( dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) &&
 181                         lc1->lc_conn == lc2->lc_conn )
 182         {
 183                 return -1;
 184         }
 185
 186         return 0;
 187 }
 188
 189 #if PRINT_CONNTREE > 0
 190 static void
 191 ravl_print( Avlnode *root, int depth )
 192 {
 193         int             i;
 194         ldapconn_t      *lc;
 195
 196         if ( root == 0 ) {
 197                 return;
 198         }
 199
 200         ravl_print( root->avl_right, depth+1 );
 201
 202         for ( i = 0; i < depth; i++ ) {
 203                 printf( "   " );
 204         }
 205
 206         lc = root->avl_data;
 207         printf( "lc(%lx) local(%s) conn(%lx) %d\n",
 208                         lc, lc->lc_local_ndn.bv_val, lc->lc_conn, root->avl_bf );
 209
 210         ravl_print( root->avl_left, depth+1 );
 211 }
 212
 213 static void
 214 myprint( Avlnode *root )
 215 {
 216         printf( "********\n" );
 217
 218         if ( root == 0 ) {
 219                 printf( "\tNULL\n" );
 220
 221         } else {
 222                 ravl_print( root, 0 );
 223         }
 224
 225         printf( "********\n" );
 226 }
 227 #endif /* PRINT_CONNTREE */
 228
 229 int
 230 ldap_back_freeconn( Operation *op, ldapconn_t *lc, int dolock )
 231 {
 232         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 233
 234         if ( dolock ) {
 235                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 236         }
 237
 238         assert( lc->lc_refcnt > 0 );
 239         if ( --lc->lc_refcnt == 0 ) {
 240                 lc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 241                                 ldap_back_conn_cmp );
 242                 assert( lc != NULL );
 243
 244                 ldap_back_conn_free( (void *)lc );
 245         }
 246
 247         if ( dolock ) {
 248                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 249         }
 250
 251         return 0;
 252 }
 253
 254 #ifdef HAVE_TLS
 255 static int
 256 ldap_back_start_tls(
 257         LDAP            *ld,
 258         int             protocol,
 259         int             *is_tls,
 260         const char      *url,
 261         unsigned        flags,
 262         int             retries,
 263         const char      **text )
 264 {
 265         int             rc = LDAP_SUCCESS;
 266         ldapinfo_t      dummy;
 267
 268         /* this is ridiculous... */
 269         dummy.li_flags = flags;
 270
 271         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 272         if ( ( LDAP_BACK_USE_TLS( &dummy ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &dummy ) ) )
 273                                 && !ldap_is_ldaps_url( url ) )
 274         {
 275 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 276                 /*
 277                  * use asynchronous StartTLS
 278                  * in case, chase referral (not implemented yet)
 279                  */
 280                 int             msgid;
 281
 282                 if ( protocol == 0 ) {
 283                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 284                                         (void *)&protocol );
 285                 }
 286
 287                 if ( protocol < LDAP_VERSION3 ) {
 288                         protocol = LDAP_VERSION3;
 289                         /* Set LDAP version */
 290                         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 291                                         (const void *)&protocol );
 292                 }
 293
 294                 rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 295                 if ( rc == LDAP_SUCCESS ) {
 296                         LDAPMessage     *res = NULL;
 297                         struct timeval  tv;
 298
 299                         LDAP_BACK_TV_SET( &tv );
 300
 301 retry:;
 302                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 303                         if ( rc < 0 ) {
 304                                 rc = LDAP_UNAVAILABLE;
 305
 306                         } else if ( rc == 0 ) {
 307                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 308                                         ldap_pvt_thread_yield();
 309                                         if ( retries > 0 ) {
 310                                                 retries--;
 311                                         }
 312                                         LDAP_BACK_TV_SET( &tv );
 313                                         goto retry;
 314                                 }
 315                                 rc = LDAP_UNAVAILABLE;
 316
 317                         } else if ( rc == LDAP_RES_EXTENDED ) {
 318                                 struct berval   *data = NULL;
 319
 320                                 rc = ldap_parse_extended_result( ld, res,
 321                                                 NULL, &data, 0 );
 322                                 if ( rc == LDAP_SUCCESS ) {
 323                                         int err;
 324                                         rc = ldap_parse_result( ld, res, &err,
 325                                                 NULL, NULL, NULL, NULL, 1 );
 326                                         if ( rc == LDAP_SUCCESS ) {
 327                                                 rc = err;
 328                                         }
 329                                         res = NULL;
 330
 331                                         /* FIXME: in case a referral
 332                                          * is returned, should we try
 333                                          * using it instead of the
 334                                          * configured URI? */
 335                                         if ( rc == LDAP_SUCCESS ) {
 336                                                 rc = ldap_install_tls( ld );
 337
 338                                         } else if ( rc == LDAP_REFERRAL ) {
 339                                                 rc = LDAP_OTHER;
 340                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 341                                         }
 342
 343                                         if ( data ) {
 344                                                 if ( data->bv_val ) {
 345                                                         ber_memfree( data->bv_val );
 346                                                 }
 347                                                 ber_memfree( data );
 348                                         }
 349                                 }
 350
 351                         } else {
 352                                 rc = LDAP_OTHER;
 353                         }
 354
 355                         if ( res != NULL ) {
 356                                 ldap_msgfree( res );
 357                         }
 358                 }
 359 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 360                 /*
 361                  * use synchronous StartTLS
 362                  */
 363                 rc = ldap_start_tls_s( ld, NULL, NULL );
 364 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 365
 366                 /* if StartTLS is requested, only attempt it if the URL
 367                  * is not "ldaps://"; this may occur not only in case
 368                  * of misconfiguration, but also when used in the chain
 369                  * overlay, where the "uri" can be parsed out of a referral */
 370                 switch ( rc ) {
 371                 case LDAP_SUCCESS:
 372                         *is_tls = 1;
 373                         break;
 374
 375                 case LDAP_SERVER_DOWN:
 376                         break;
 377
 378                 default:
 379                         if ( LDAP_BACK_TLS_CRITICAL( &dummy ) ) {
 380                                 *text = "could not start TLS";
 381                                 break;
 382                         }
 383
 384                         /* in case Start TLS is not critical */
 385                         *is_tls = 0;
 386                         rc = LDAP_SUCCESS;
 387                         break;
 388                 }
 389
 390         } else {
 391                 *is_tls = 0;
 392         }
 393
 394         return rc;
 395 }
 396 #endif /* HAVE_TLS */
 397
 398 static int
 399 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 400 {
 401         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 402         int             vers = op->o_protocol;
 403         LDAP            *ld = NULL;
 404 #ifdef HAVE_TLS
 405         int             is_tls = op->o_conn->c_is_tls;
 406 #endif /* HAVE_TLS */
 407
 408         assert( lcp != NULL );
 409
 410         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 411         if ( rs->sr_err != LDAP_SUCCESS ) {
 412                 goto error_return;
 413         }
 414
 415         /* Set LDAP version. This will always succeed: If the client
 416          * bound with a particular version, then so can we.
 417          */
 418         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&vers );
 419
 420         /* automatically chase referrals ("[dont-]chase-referrals" statement) */
 421         if ( LDAP_BACK_CHASE_REFERRALS( li ) ) {
 422                 ldap_set_option( ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON );
 423         }
 424
 425 #ifdef HAVE_TLS
 426         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 427                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 428         if ( rs->sr_err != LDAP_SUCCESS ) {
 429                 ldap_unbind_ext( ld, NULL, NULL );
 430                 goto error_return;
 431         }
 432 #endif /* HAVE_TLS */
 433
 434         if ( *lcp == NULL ) {
 435                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 436                 (*lcp)->lc_flags= li->li_flags;
 437         }
 438         (*lcp)->lc_ld = ld;
 439         (*lcp)->lc_refcnt = 1;
 440 #ifdef HAVE_TLS
 441         if ( is_tls ) {
 442                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 443         } else {
 444                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 445         }
 446 #endif /* HAVE_TLS */
 447
 448 error_return:;
 449         if ( rs->sr_err != LDAP_SUCCESS ) {
 450                 rs->sr_err = slap_map_api2result( rs );
 451                 if ( sendok & LDAP_BACK_SENDERR ) {
 452                         if ( rs->sr_text == NULL ) {
 453                                 rs->sr_text = "ldap_initialize() failed";
 454                         }
 455                         send_ldap_result( op, rs );
 456                         rs->sr_text = NULL;
 457                 }
 458         }
 459
 460         return rs->sr_err;
 461 }
 462
 463 ldapconn_t *
 464 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 465 {
 466         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 467         ldapconn_t      *lc,
 468                         lc_curr = { 0 };
 469         int             refcnt = 1;
 470
 471         /* Internal searches are privileged and shared. So is root. */
 472         if ( op->o_do_not_cache || be_isroot( op ) ) {
 473                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 474                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 475                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 476
 477         } else {
 478                 lc_curr.lc_local_ndn = op->o_ndn;
 479                 /* Explicit binds must not be shared */
 480                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 481                         lc_curr.lc_conn = op->o_conn;
 482
 483                 } else {
 484                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 485                 }
 486         }
 487
 488         /* Searches for a ldapconn in the avl tree */
 489         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 490
 491         lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 492                         (caddr_t)&lc_curr, ldap_back_conn_cmp );
 493         if ( lc != NULL ) {
 494                 refcnt = ++lc->lc_refcnt;
 495         }
 496         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 497
 498         /* Looks like we didn't get a bind. Open a new session... */
 499         if ( lc == NULL ) {
 500                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 501                         return NULL;
 502                 }
 503
 504                 lc->lc_conn = lc_curr.lc_conn;
 505                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 506
 507                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 508                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 509                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 510                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 511
 512                 } else {
 513                         BER_BVZERO( &lc->lc_cred );
 514                         BER_BVZERO( &lc->lc_bound_ndn );
 515 #if 0
 516                         /* FIXME: if we set lc_bound_ndn = o_ndn
 517                          * we end up with a bind with DN but no password! */
 518                         if ( !BER_BVISEMPTY( &op->o_ndn )
 519                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 520                         {
 521                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 522                         }
 523 #endif
 524                 }
 525
 526 #ifdef HAVE_TLS
 527                 /* if start TLS failed but it was not mandatory,
 528                  * check if the non-TLS connection was already
 529                  * in cache; in case, destroy the newly created
 530                  * connection and use the existing one */
 531                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 532                                 && !ldap_tls_inplace( lc->lc_ld ) )
 533                 {
 534                         ldapconn_t *tmplc;
 535
 536                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 537                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 538                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 539                                         (caddr_t)&lc_curr, ldap_back_conn_cmp );
 540                         if ( tmplc != NULL ) {
 541                                 refcnt = ++tmplc->lc_refcnt;
 542                                 ldap_back_conn_free( lc );
 543                                 lc = tmplc;
 544                         }
 545                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 546
 547                         if ( tmplc != NULL ) {
 548                                 goto done;
 549                         }
 550                 }
 551 #endif /* HAVE_TLS */
 552
 553                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 554
 555                 /* Inserts the newly created ldapconn in the avl tree */
 556                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 557
 558                 assert( lc->lc_refcnt == 1 );
 559                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 560                         ldap_back_conn_cmp, ldap_back_conn_dup );
 561
 562 #if PRINT_CONNTREE > 0
 563                 myprint( li->li_conninfo.lai_tree );
 564 #endif /* PRINT_CONNTREE */
 565
 566                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 567
 568                 Debug( LDAP_DEBUG_TRACE,
 569                         "=>ldap_back_getconn: conn %p inserted (refcnt=%u)\n",
 570                         (void *)lc, refcnt, 0 );
 571
 572                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 573                 if ( rs->sr_err != 0 ) {
 574                         ldap_back_conn_free( lc );
 575                         rs->sr_err = LDAP_OTHER;
 576                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 577                                 send_ldap_error( op, rs, LDAP_OTHER,
 578                                         "internal server error" );
 579                         }
 580                         return NULL;
 581                 }
 582
 583         } else {
 584                 if ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout ) {
 585                         /* in case of failure, it frees/taints lc and sets it to NULL */
 586                         if ( ldap_back_retry( &lc, op, rs, sendok ) ) {
 587                                 lc = NULL;
 588                         }
 589                 }
 590
 591                 if ( lc ) {
 592                         Debug( LDAP_DEBUG_TRACE,
 593                                 "=>ldap_back_getconn: conn %p fetched (refcnt=%u)\n",
 594                                 (void *)lc, refcnt, 0 );
 595                 }
 596         }
 597
 598         if ( li->li_idle_timeout && lc ) {
 599                 lc->lc_time = op->o_time;
 600         }
 601
 602 done:;
 603         return lc;
 604 }
 605
 606 void
 607 ldap_back_release_conn(
 608         Operation               *op,
 609         SlapReply               *rs,
 610         ldapconn_t              *lc )
 611 {
 612         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 613
 614         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 615         assert( lc->lc_refcnt > 0 );
 616         lc->lc_refcnt--;
 617         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 618 }
 619
 620 /*
 621  * ldap_back_dobind
 622  *
 623  * Note: as the check for the value of lc->lc_bound was already here, I removed
 624  * it from all the callers, and I made the function return the flag, so
 625  * it can be used to simplify the check.
 626  *
 627  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 628  */
 629 static int
 630 ldap_back_dobind_int(
 631         ldapconn_t              *lc,
 632         Operation               *op,
 633         SlapReply               *rs,
 634         ldap_back_send_t        sendok,
 635         int                     retries,
 636         int                     dolock )
 637 {
 638         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 639
 640         int             rc = LDAP_BACK_CONN_ISBOUND( lc );
 641         ber_int_t       msgid;
 642
 643         assert( retries >= 0 );
 644
 645         if ( rc ) {
 646                 return rc;
 647         }
 648
 649         /*
 650          * FIXME: we need to let clients use proxyAuthz
 651          * otherwise we cannot do symmetric pools of servers;
 652          * we have to live with the fact that a user can
 653          * authorize itself as any ID that is allowed
 654          * by the authzTo directive of the "proxyauthzdn".
 655          */
 656         /*
 657          * NOTE: current Proxy Authorization specification
 658          * and implementation do not allow proxy authorization
 659          * control to be provided with Bind requests
 660          */
 661         /*
 662          * if no bind took place yet, but the connection is bound
 663          * and the "idassert-authcDN" (or other ID) is set,
 664          * then bind as the asserting identity and explicitly
 665          * add the proxyAuthz control to every operation with the
 666          * dn bound to the connection as control value.
 667          * This is done also if this is the authrizing backend,
 668          * but the "override" flag is given to idassert.
 669          * It allows to use SASL bind and yet proxyAuthz users
 670          */
 671         if ( op->o_conn != NULL &&
 672                         !op->o_do_not_cache &&
 673                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 674                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 675         {
 676                 (void)ldap_back_proxy_authz_bind( lc, op, rs );
 677                 goto done;
 678         }
 679
 680 #ifdef HAVE_CYRUS_SASL
 681         if ( LDAP_BACK_CONN_ISPRIV( lc )
 682                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 683         {
 684                 void            *defaults = NULL;
 685
 686                 if ( li->li_acl_secprops != NULL ) {
 687                         rc = ldap_set_option( lc->lc_ld,
 688                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 689
 690                         if ( rc != LDAP_OPT_SUCCESS ) {
 691                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 692                                         "(%s,SECPROPS,\"%s\") failed!\n",
 693                                         li->li_uri, li->li_acl_secprops, 0 );
 694                                 goto done;
 695                         }
 696                 }
 697
 698                 defaults = lutil_sasl_defaults( lc->lc_ld,
 699                                 li->li_acl_sasl_mech.bv_val,
 700                                 li->li_acl_sasl_realm.bv_val,
 701                                 li->li_acl_authcID.bv_val,
 702                                 li->li_acl_passwd.bv_val,
 703                                 NULL );
 704
 705                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 706                                 li->li_acl_authcDN.bv_val,
 707                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 708                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 709                                 defaults );
 710
 711                 lutil_sasl_freedefs( defaults );
 712
 713                 rs->sr_err = slap_map_api2result( rs );
 714                 if ( rs->sr_err != LDAP_SUCCESS ) {
 715                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 716                         send_ldap_result( op, rs );
 717
 718                 } else {
 719                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 720                 }
 721                 goto done;
 722         }
 723 #endif /* HAVE_CYRUS_SASL */
 724
 725 retry:;
 726         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 727                         lc->lc_bound_ndn.bv_val,
 728                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 729                         NULL, NULL, &msgid );
 730
 731         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 732                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 733                         if ( dolock ) {
 734                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 735                         }
 736
 737                         assert( lc->lc_refcnt > 0 );
 738                         if ( lc->lc_refcnt == 1 ) {
 739                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 740                                 lc->lc_ld = NULL;
 741
 742                                 /* lc here must be the regular lc, reset and ready for init */
 743                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 744                         }
 745                         if ( dolock ) {
 746                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 747                         }
 748                         if ( rs->sr_err == LDAP_SUCCESS ) {
 749                                 if ( retries > 0 ) {
 750                                         retries--;
 751                                 }
 752                                 goto retry;
 753                         }
 754                 }
 755
 756                 ldap_back_freeconn( op, lc, dolock );
 757                 rs->sr_err = slap_map_api2result( rs );
 758
 759                 return 0;
 760         }
 761
 762         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
 763         if ( rc == LDAP_SUCCESS ) {
 764                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 765
 766         } else {
 767                 ldap_back_release_conn( op, rs, lc );
 768         }
 769
 770 done:;
 771         rc = LDAP_BACK_CONN_ISBOUND( lc );
 772
 773         return rc;
 774 }
 775
 776 int
 777 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 778 {
 779         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 780
 781         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
 782 }
 783
 784 /*
 785  * ldap_back_default_rebind
 786  *
 787  * This is a callback used for chasing referrals using the same
 788  * credentials as the original user on this session.
 789  */
 790 static int
 791 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 792         ber_int_t msgid, void *params )
 793 {
 794         ldapconn_t      *lc = (ldapconn_t *)params;
 795
 796 #ifdef HAVE_TLS
 797         /* ... otherwise we couldn't get here */
 798         assert( lc != NULL );
 799
 800         if ( !ldap_tls_inplace( ld ) ) {
 801                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
 802                                 rc;
 803                 const char      *text = NULL;
 804
 805                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
 806                         LDAP_BACK_RETRY_DEFAULT, &text );
 807                 if ( rc != LDAP_SUCCESS ) {
 808                         return rc;
 809                 }
 810         }
 811 #endif /* HAVE_TLS */
 812
 813         /* FIXME: add checks on the URL/identity? */
 814
 815         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
 816                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
 817 }
 818
 819 int
 820 ldap_back_op_result(
 821                 ldapconn_t              *lc,
 822                 Operation               *op,
 823                 SlapReply               *rs,
 824                 ber_int_t               msgid,
 825                 time_t                  timeout,
 826                 ldap_back_send_t        sendok )
 827 {
 828         char            *match = NULL;
 829         LDAPMessage     *res = NULL;
 830         char            *text = NULL;
 831
 832 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 833
 834         rs->sr_text = NULL;
 835         rs->sr_matched = NULL;
 836
 837         /* if the error recorded in the reply corresponds
 838          * to a successful state, get the error from the
 839          * remote server response */
 840         if ( ERR_OK( rs->sr_err ) ) {
 841                 int             rc;
 842                 struct timeval  tv;
 843
 844                 if ( timeout ) {
 845                         tv.tv_sec = timeout;
 846                         tv.tv_usec = 0;
 847
 848                 } else {
 849                         LDAP_BACK_TV_SET( &tv );
 850                 }
 851
 852 retry:;
 853                 /* if result parsing fails, note the failure reason */
 854                 rc = ldap_result( lc->lc_ld, msgid, 1, &tv, &res );
 855                 switch ( rc ) {
 856                 case 0:
 857                         if ( timeout ) {
 858                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 859                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
 860                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
 861                                 rs->sr_text = "Operation timed out";
 862                                 break;
 863                         }
 864
 865                         LDAP_BACK_TV_SET( &tv );
 866                         ldap_pvt_thread_yield();
 867                         goto retry;
 868
 869                 case -1:
 870                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
 871                                         &rs->sr_err );
 872                         break;
 873
 874
 875                 /* otherwise get the result; if it is not
 876                  * LDAP_SUCCESS, record it in the reply
 877                  * structure (this includes
 878                  * LDAP_COMPARE_{TRUE|FALSE}) */
 879                 default:
 880                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 881                                         &match, &text, NULL, NULL, 1 );
 882 #ifndef LDAP_NULL_IS_NULL
 883                         if ( match != NULL && match[ 0 ] == '\0' ) {
 884                                 ldap_memfree( match );
 885                                 match = NULL;
 886                         }
 887                         if ( text != NULL && text[ 0 ] == '\0' ) {
 888                                 ldap_memfree( text );
 889                                 text = NULL;
 890                         }
 891 #endif /* LDAP_NULL_IS_NULL */
 892                         rs->sr_text = text;
 893                         if ( rc != LDAP_SUCCESS ) {
 894                                 rs->sr_err = rc;
 895                         }
 896                 }
 897         }
 898
 899         /* if the error in the reply structure is not
 900          * LDAP_SUCCESS, try to map it from client
 901          * to server error */
 902         if ( !ERR_OK( rs->sr_err ) ) {
 903                 rs->sr_err = slap_map_api2result( rs );
 904
 905                 /* internal ops ( op->o_conn == NULL )
 906                  * must not reply to client */
 907                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 908
 909                         /* record the (massaged) matched
 910                          * DN into the reply structure */
 911                         rs->sr_matched = match;
 912                 }
 913         }
 914         if ( op->o_conn &&
 915                         ( ( sendok & LDAP_BACK_SENDOK )
 916                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
 917         {
 918                 send_ldap_result( op, rs );
 919         }
 920         if ( match ) {
 921                 if ( rs->sr_matched != match ) {
 922                         free( (char *)rs->sr_matched );
 923                 }
 924                 rs->sr_matched = NULL;
 925                 ldap_memfree( match );
 926         }
 927         if ( text ) {
 928                 ldap_memfree( text );
 929         }
 930         rs->sr_text = NULL;
 931         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
 932 }
 933
 934 /* return true if bound, false if failed */
 935 int
 936 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 937 {
 938         int             rc = 0;
 939         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 940
 941         assert( lcp != NULL );
 942         assert( *lcp != NULL );
 943
 944         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 945
 946         if ( (*lcp)->lc_refcnt == 1 ) {
 947                 Debug( LDAP_DEBUG_ANY,
 948                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
 949                         op->o_log_prefix, li->li_uri,
 950                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
 951                                 "" : (*lcp)->lc_bound_ndn.bv_val );
 952
 953                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
 954                 (*lcp)->lc_ld = NULL;
 955                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
 956
 957                 /* lc here must be the regular lc, reset and ready for init */
 958                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
 959                 if ( rc != LDAP_SUCCESS ) {
 960                         rc = 0;
 961                         *lcp = NULL;
 962
 963                 } else {
 964                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
 965                         if ( rc == 0 ) {
 966                                 *lcp = NULL;
 967                         }
 968                 }
 969         }
 970
 971         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 972
 973         return rc;
 974 }
 975
 976 static int
 977 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs )
 978 {
 979         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 980         struct berval   binddn = slap_empty_bv;
 981         struct berval   bindcred = slap_empty_bv;
 982         int             dobind = 0;
 983         int             msgid;
 984         int             rc;
 985
 986         /*
 987          * FIXME: we need to let clients use proxyAuthz
 988          * otherwise we cannot do symmetric pools of servers;
 989          * we have to live with the fact that a user can
 990          * authorize itself as any ID that is allowed
 991          * by the authzTo directive of the "proxyauthzdn".
 992          */
 993         /*
 994          * NOTE: current Proxy Authorization specification
 995          * and implementation do not allow proxy authorization
 996          * control to be provided with Bind requests
 997          */
 998         /*
 999          * if no bind took place yet, but the connection is bound
1000          * and the "proxyauthzdn" is set, then bind as
1001          * "proxyauthzdn" and explicitly add the proxyAuthz
1002          * control to every operation with the dn bound
1003          * to the connection as control value.
1004          */
1005
1006         /* bind as proxyauthzdn only if no idassert mode
1007          * is requested, or if the client's identity
1008          * is authorized */
1009         switch ( li->li_idassert_mode ) {
1010         case LDAP_BACK_IDASSERT_LEGACY:
1011                 if ( !BER_BVISNULL( &op->o_conn->c_ndn ) && !BER_BVISEMPTY( &op->o_conn->c_ndn ) ) {
1012                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1013                         {
1014                                 binddn = li->li_idassert_authcDN;
1015                                 bindcred = li->li_idassert_passwd;
1016                                 dobind = 1;
1017                         }
1018                 }
1019                 break;
1020
1021         default:
1022                 /* NOTE: rootdn can always idassert */
1023                 if ( li->li_idassert_authz && !be_isroot( op ) ) {
1024                         struct berval authcDN;
1025
1026                         if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1027                                 authcDN = slap_empty_bv;
1028
1029                         } else {
1030                                 authcDN = op->o_conn->c_ndn;
1031                         }
1032                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1033                                         &authcDN, &authcDN );
1034                         if ( rs->sr_err != LDAP_SUCCESS ) {
1035                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1036                                         send_ldap_result( op, rs );
1037                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1038
1039                                 } else {
1040                                         rs->sr_err = LDAP_SUCCESS;
1041                                         binddn = slap_empty_bv;
1042                                         bindcred = slap_empty_bv;
1043                                         break;
1044                                 }
1045
1046                                 goto done;
1047                         }
1048                 }
1049
1050                 binddn = li->li_idassert_authcDN;
1051                 bindcred = li->li_idassert_passwd;
1052                 dobind = 1;
1053                 break;
1054         }
1055
1056         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1057 #ifdef HAVE_CYRUS_SASL
1058                 void            *defaults = NULL;
1059                 struct berval   authzID = BER_BVNULL;
1060                 int             freeauthz = 0;
1061
1062                 /* if SASL supports native authz, prepare for it */
1063                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1064                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1065                 {
1066                         switch ( li->li_idassert_mode ) {
1067                         case LDAP_BACK_IDASSERT_OTHERID:
1068                         case LDAP_BACK_IDASSERT_OTHERDN:
1069                                 authzID = li->li_idassert_authzID;
1070                                 break;
1071
1072                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1073                                 BER_BVSTR( &authzID, "dn:" );
1074                                 break;
1075
1076                         case LDAP_BACK_IDASSERT_SELF:
1077                                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1078                                         /* connection is not authc'd, so don't idassert */
1079                                         BER_BVSTR( &authzID, "dn:" );
1080                                         break;
1081                                 }
1082                                 authzID.bv_len = STRLENOF( "dn:" ) + op->o_conn->c_ndn.bv_len;
1083                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1084                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1085                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1086                                                 op->o_conn->c_ndn.bv_val, op->o_conn->c_ndn.bv_len + 1 );
1087                                 freeauthz = 1;
1088                                 break;
1089
1090                         default:
1091                                 break;
1092                         }
1093                 }
1094
1095                 if ( li->li_idassert_secprops != NULL ) {
1096                         rs->sr_err = ldap_set_option( lc->lc_ld,
1097                                 LDAP_OPT_X_SASL_SECPROPS,
1098                                 (void *)li->li_idassert_secprops );
1099
1100                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1101                                 send_ldap_result( op, rs );
1102                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1103                                 goto done;
1104                         }
1105                 }
1106
1107                 defaults = lutil_sasl_defaults( lc->lc_ld,
1108                                 li->li_idassert_sasl_mech.bv_val,
1109                                 li->li_idassert_sasl_realm.bv_val,
1110                                 li->li_idassert_authcID.bv_val,
1111                                 li->li_idassert_passwd.bv_val,
1112                                 authzID.bv_val );
1113
1114                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1115                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1116                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1117                                 defaults );
1118
1119                 rs->sr_err = slap_map_api2result( rs );
1120                 if ( rs->sr_err != LDAP_SUCCESS ) {
1121                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1122                         send_ldap_result( op, rs );
1123
1124                 } else {
1125                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1126                 }
1127
1128                 lutil_sasl_freedefs( defaults );
1129                 if ( freeauthz ) {
1130                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1131                 }
1132
1133                 goto done;
1134 #endif /* HAVE_CYRUS_SASL */
1135         }
1136
1137         switch ( li->li_idassert_authmethod ) {
1138         case LDAP_AUTH_NONE:
1139                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1140                 goto done;
1141
1142         case LDAP_AUTH_SIMPLE:
1143                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1144                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1145                                 &bindcred, NULL, NULL, &msgid );
1146                 break;
1147
1148         default:
1149                 /* unsupported! */
1150                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1151                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1152                 send_ldap_result( op, rs );
1153                 goto done;
1154         }
1155
1156         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
1157         if ( rc == LDAP_SUCCESS ) {
1158                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1159         }
1160 done:;
1161         return LDAP_BACK_CONN_ISBOUND( lc );
1162 }
1163
1164 /*
1165  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1166  * to existing server-side controls if required; if not,
1167  * the existing server-side controls are placed in *pctrls.
1168  * The caller, after using the controls in client API
1169  * operations, if ( *pctrls != op->o_ctrls ), should
1170  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1171  * The function returns success if the control could
1172  * be added if required, or if it did nothing; in the future,
1173  * it might return some error if it failed.
1174  *
1175  * if no bind took place yet, but the connection is bound
1176  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1177  * and explicitly add proxyAuthz the control to every operation
1178  * with the dn bound to the connection as control value.
1179  *
1180  * If no server-side controls are defined for the operation,
1181  * simply add the proxyAuthz control; otherwise, if the
1182  * proxyAuthz control is not already set, add it as
1183  * the first one
1184  *
1185  * FIXME: is controls order significant for security?
1186  * ANSWER: controls ordering and interoperability
1187  * must be indicated by the specs of each control; if none
1188  * is specified, the order is irrelevant.
1189  */
1190 int
1191 ldap_back_proxy_authz_ctrl(
1192                 ldapconn_t      *lc,
1193                 Operation       *op,
1194                 SlapReply       *rs,
1195                 LDAPControl     ***pctrls )
1196 {
1197         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1198         LDAPControl     **ctrls = NULL;
1199         int             i = 0,
1200                         mode;
1201         struct berval   assertedID;
1202
1203         *pctrls = NULL;
1204
1205         rs->sr_err = LDAP_SUCCESS;
1206
1207         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1208          * but if it is not set this test fails.  We need a different
1209          * means to detect if idassert is enabled */
1210         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1211                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1212         {
1213                 goto done;
1214         }
1215
1216         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1217                 goto done;
1218         }
1219
1220         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1221                 if ( op->o_proxy_authz ) {
1222                         /*
1223                          * FIXME: we do not want to perform proxyAuthz
1224                          * on behalf of the client, because this would
1225                          * be performed with "proxyauthzdn" privileges.
1226                          *
1227                          * This might actually be too strict, since
1228                          * the "proxyauthzdn" authzTo, and each entry's
1229                          * authzFrom attributes may be crafted
1230                          * to avoid unwanted proxyAuthz to take place.
1231                          */
1232 #if 0
1233                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1234                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1235 #endif
1236                         goto done;
1237                 }
1238
1239                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1240                         goto done;
1241                 }
1242
1243                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1244                         goto done;
1245                 }
1246
1247                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1248                         goto done;
1249                 }
1250
1251         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1252                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1253                                 /* && ( !BER_BVISNULL( &op->o_conn->c_ndn )
1254                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1255                 {
1256                         /* already asserted in SASL via native authz */
1257                         /* NOTE: the test on lc->lc_bound is used to trap
1258                          * native authorization of anonymous users,
1259                          * since in that case op->o_conn->c_ndn is NULL */
1260                         goto done;
1261                 }
1262
1263         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1264                 int             rc;
1265                 struct berval authcDN;
1266
1267                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1268                         authcDN = slap_empty_bv;
1269                 } else {
1270                         authcDN = op->o_conn->c_ndn;
1271                 }
1272                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1273                                 &authcDN, & authcDN );
1274                 if ( rc != LDAP_SUCCESS ) {
1275                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1276                         {
1277                                 /* op->o_conn->c_ndn is not authorized
1278                                  * to use idassert */
1279                                 return rc;
1280                         }
1281                         return rs->sr_err;
1282                 }
1283         }
1284
1285         if ( op->o_proxy_authz ) {
1286                 /*
1287                  * FIXME: we can:
1288                  * 1) ignore the already set proxyAuthz control
1289                  * 2) leave it in place, and don't set ours
1290                  * 3) add both
1291                  * 4) reject the operation
1292                  *
1293                  * option (4) is very drastic
1294                  * option (3) will make the remote server reject
1295                  * the operation, thus being equivalent to (4)
1296                  * option (2) will likely break the idassert
1297                  * assumptions, so we cannot accept it;
1298                  * option (1) means that we are contradicting
1299                  * the client's reques.
1300                  *
1301                  * I think (4) is the only correct choice.
1302                  */
1303                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1304                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1305         }
1306
1307         if ( op->o_is_auth_check ) {
1308                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1309
1310         } else {
1311                 mode = li->li_idassert_mode;
1312         }
1313
1314         switch ( mode ) {
1315         case LDAP_BACK_IDASSERT_LEGACY:
1316         case LDAP_BACK_IDASSERT_SELF:
1317                 /* original behavior:
1318                  * assert the client's identity */
1319                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1320                         assertedID = slap_empty_bv;
1321                 } else {
1322                         assertedID = op->o_conn->c_ndn;
1323                 }
1324                 break;
1325
1326         case LDAP_BACK_IDASSERT_ANONYMOUS:
1327                 /* assert "anonymous" */
1328                 assertedID = slap_empty_bv;
1329                 break;
1330
1331         case LDAP_BACK_IDASSERT_NOASSERT:
1332                 /* don't assert; bind as proxyauthzdn */
1333                 goto done;
1334
1335         case LDAP_BACK_IDASSERT_OTHERID:
1336         case LDAP_BACK_IDASSERT_OTHERDN:
1337                 /* assert idassert DN */
1338                 assertedID = li->li_idassert_authzID;
1339                 break;
1340
1341         default:
1342                 assert( 0 );
1343         }
1344
1345         if ( BER_BVISNULL( &assertedID ) ) {
1346                 assertedID = slap_empty_bv;
1347         }
1348
1349         if ( op->o_ctrls ) {
1350                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1351                         /* just count ctrls */ ;
1352         }
1353
1354         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
1355         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
1356
1357         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1358         ctrls[ 0 ]->ldctl_iscritical = 1;
1359
1360         switch ( li->li_idassert_mode ) {
1361         /* already in u:ID or dn:DN form */
1362         case LDAP_BACK_IDASSERT_OTHERID:
1363         case LDAP_BACK_IDASSERT_OTHERDN:
1364                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
1365                 break;
1366
1367         /* needs the dn: prefix */
1368         default:
1369                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1370                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
1371                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1372                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1373                                 assertedID.bv_val, assertedID.bv_len + 1 );
1374                 break;
1375         }
1376
1377         if ( op->o_ctrls ) {
1378                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1379                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1380                 }
1381         }
1382         ctrls[ i + 1 ] = NULL;
1383
1384 done:;
1385         if ( ctrls == NULL ) {
1386                 ctrls = op->o_ctrls;
1387         }
1388
1389         *pctrls = ctrls;
1390
1391         return rs->sr_err;
1392 }
1393
1394 int
1395 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1396 {
1397         LDAPControl     **ctrls = *pctrls;
1398
1399         /* we assume that the first control is the proxyAuthz
1400          * added by back-ldap, so it's the only one we explicitly
1401          * free */
1402         if ( ctrls && ctrls != op->o_ctrls ) {
1403                 assert( ctrls[ 0 ] != NULL );
1404
1405                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1406                         free( ctrls[ 0 ]->ldctl_value.bv_val );
1407                 }
1408
1409                 free( ctrls[ 0 ] );
1410                 free( ctrls );
1411         }
1412
1413         *pctrls = NULL;
1414
1415         return 0;
1416 }