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_OTHER;
 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_OTHER;
 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                 Debug( LDAP_DEBUG_TRACE,
 585                         "=>ldap_back_getconn: conn %p fetched (refcnt=%u)\n",
 586                         (void *)lc, refcnt, 0 );
 587         }
 588
 589 done:;
 590         return lc;
 591 }
 592
 593 void
 594 ldap_back_release_conn(
 595         Operation               *op,
 596         SlapReply               *rs,
 597         ldapconn_t              *lc )
 598 {
 599         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 600
 601         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 602         assert( lc->lc_refcnt > 0 );
 603         lc->lc_refcnt--;
 604         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 605 }
 606
 607 /*
 608  * ldap_back_dobind
 609  *
 610  * Note: as the check for the value of lc->lc_bound was already here, I removed
 611  * it from all the callers, and I made the function return the flag, so
 612  * it can be used to simplify the check.
 613  *
 614  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 615  */
 616 static int
 617 ldap_back_dobind_int(
 618         ldapconn_t              *lc,
 619         Operation               *op,
 620         SlapReply               *rs,
 621         ldap_back_send_t        sendok,
 622         int                     retries,
 623         int                     dolock )
 624 {
 625         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 626
 627         int             rc = LDAP_BACK_CONN_ISBOUND( lc );
 628         ber_int_t       msgid;
 629
 630         assert( retries >= 0 );
 631
 632         if ( rc ) {
 633                 return rc;
 634         }
 635
 636         /*
 637          * FIXME: we need to let clients use proxyAuthz
 638          * otherwise we cannot do symmetric pools of servers;
 639          * we have to live with the fact that a user can
 640          * authorize itself as any ID that is allowed
 641          * by the authzTo directive of the "proxyauthzdn".
 642          */
 643         /*
 644          * NOTE: current Proxy Authorization specification
 645          * and implementation do not allow proxy authorization
 646          * control to be provided with Bind requests
 647          */
 648         /*
 649          * if no bind took place yet, but the connection is bound
 650          * and the "idassert-authcDN" (or other ID) is set,
 651          * then bind as the asserting identity and explicitly
 652          * add the proxyAuthz control to every operation with the
 653          * dn bound to the connection as control value.
 654          * This is done also if this is the authrizing backend,
 655          * but the "override" flag is given to idassert.
 656          * It allows to use SASL bind and yet proxyAuthz users
 657          */
 658         if ( op->o_conn != NULL &&
 659                         !op->o_do_not_cache &&
 660                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 661                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 662         {
 663                 (void)ldap_back_proxy_authz_bind( lc, op, rs );
 664                 goto done;
 665         }
 666
 667 #ifdef HAVE_CYRUS_SASL
 668         if ( LDAP_BACK_CONN_ISPRIV( lc )
 669                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 670         {
 671                 void            *defaults = NULL;
 672
 673                 if ( li->li_acl_secprops != NULL ) {
 674                         rc = ldap_set_option( lc->lc_ld,
 675                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 676
 677                         if ( rc != LDAP_OPT_SUCCESS ) {
 678                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 679                                         "(%s,SECPROPS,\"%s\") failed!\n",
 680                                         li->li_uri, li->li_acl_secprops, 0 );
 681                                 goto done;
 682                         }
 683                 }
 684
 685                 defaults = lutil_sasl_defaults( lc->lc_ld,
 686                                 li->li_acl_sasl_mech.bv_val,
 687                                 li->li_acl_sasl_realm.bv_val,
 688                                 li->li_acl_authcID.bv_val,
 689                                 li->li_acl_passwd.bv_val,
 690                                 NULL );
 691
 692                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 693                                 li->li_acl_authcDN.bv_val,
 694                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 695                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 696                                 defaults );
 697
 698                 lutil_sasl_freedefs( defaults );
 699
 700                 rs->sr_err = slap_map_api2result( rs );
 701                 if ( rs->sr_err != LDAP_SUCCESS ) {
 702                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 703                         send_ldap_result( op, rs );
 704
 705                 } else {
 706                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 707                 }
 708                 goto done;
 709         }
 710 #endif /* HAVE_CYRUS_SASL */
 711
 712 retry:;
 713         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 714                         lc->lc_bound_ndn.bv_val,
 715                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 716                         NULL, NULL, &msgid );
 717
 718         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 719                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 720                         if ( dolock ) {
 721                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 722                         }
 723
 724                         assert( lc->lc_refcnt > 0 );
 725                         if ( lc->lc_refcnt == 1 ) {
 726                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 727                                 lc->lc_ld = NULL;
 728
 729                                 /* lc here must be the regular lc, reset and ready for init */
 730                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 731                         }
 732                         if ( dolock ) {
 733                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 734                         }
 735                         if ( rs->sr_err == LDAP_SUCCESS ) {
 736                                 if ( retries > 0 ) {
 737                                         retries--;
 738                                 }
 739                                 goto retry;
 740                         }
 741                 }
 742
 743                 ldap_back_freeconn( op, lc, dolock );
 744                 rs->sr_err = slap_map_api2result( rs );
 745
 746                 return 0;
 747         }
 748
 749         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
 750         if ( rc == LDAP_SUCCESS ) {
 751                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 752
 753         } else {
 754                 ldap_back_release_conn( op, rs, lc );
 755         }
 756
 757 done:;
 758         rc = LDAP_BACK_CONN_ISBOUND( lc );
 759
 760         return rc;
 761 }
 762
 763 int
 764 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 765 {
 766         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 767
 768         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
 769 }
 770
 771 /*
 772  * ldap_back_default_rebind
 773  *
 774  * This is a callback used for chasing referrals using the same
 775  * credentials as the original user on this session.
 776  */
 777 static int
 778 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 779         ber_int_t msgid, void *params )
 780 {
 781         ldapconn_t      *lc = (ldapconn_t *)params;
 782
 783 #ifdef HAVE_TLS
 784         /* ... otherwise we couldn't get here */
 785         assert( lc != NULL );
 786
 787         if ( !ldap_tls_inplace( ld ) ) {
 788                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
 789                                 rc;
 790                 const char      *text = NULL;
 791
 792                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
 793                         LDAP_BACK_RETRY_DEFAULT, &text );
 794                 if ( rc != LDAP_SUCCESS ) {
 795                         return rc;
 796                 }
 797         }
 798 #endif /* HAVE_TLS */
 799
 800         /* FIXME: add checks on the URL/identity? */
 801
 802         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
 803                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
 804 }
 805
 806 int
 807 ldap_back_op_result(
 808                 ldapconn_t              *lc,
 809                 Operation               *op,
 810                 SlapReply               *rs,
 811                 ber_int_t               msgid,
 812                 time_t                  timeout,
 813                 ldap_back_send_t        sendok )
 814 {
 815         char            *match = NULL;
 816         LDAPMessage     *res = NULL;
 817         char            *text = NULL;
 818
 819 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 820
 821         rs->sr_text = NULL;
 822         rs->sr_matched = NULL;
 823
 824         /* if the error recorded in the reply corresponds
 825          * to a successful state, get the error from the
 826          * remote server response */
 827         if ( ERR_OK( rs->sr_err ) ) {
 828                 int             rc;
 829                 struct timeval  tv;
 830
 831                 if ( timeout ) {
 832                         tv.tv_sec = timeout;
 833                         tv.tv_usec = 0;
 834
 835                 } else {
 836                         LDAP_BACK_TV_SET( &tv );
 837                 }
 838
 839 retry:;
 840                 /* if result parsing fails, note the failure reason */
 841                 rc = ldap_result( lc->lc_ld, msgid, 1, &tv, &res );
 842                 switch ( rc ) {
 843                 case 0:
 844                         if ( timeout ) {
 845                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 846                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
 847                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
 848                                 rs->sr_text = "Operation timed out";
 849                                 break;
 850                         }
 851
 852                         LDAP_BACK_TV_SET( &tv );
 853                         ldap_pvt_thread_yield();
 854                         goto retry;
 855
 856                 case -1:
 857                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
 858                                         &rs->sr_err );
 859                         break;
 860
 861
 862                 /* otherwise get the result; if it is not
 863                  * LDAP_SUCCESS, record it in the reply
 864                  * structure (this includes
 865                  * LDAP_COMPARE_{TRUE|FALSE}) */
 866                 default:
 867                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 868                                         &match, &text, NULL, NULL, 1 );
 869                         rs->sr_text = text;
 870                         if ( rc != LDAP_SUCCESS ) {
 871                                 rs->sr_err = rc;
 872                         }
 873                 }
 874         }
 875
 876         /* if the error in the reply structure is not
 877          * LDAP_SUCCESS, try to map it from client
 878          * to server error */
 879         if ( !ERR_OK( rs->sr_err ) ) {
 880                 rs->sr_err = slap_map_api2result( rs );
 881
 882                 /* internal ops ( op->o_conn == NULL )
 883                  * must not reply to client */
 884                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 885
 886                         /* record the (massaged) matched
 887                          * DN into the reply structure */
 888                         rs->sr_matched = match;
 889                 }
 890         }
 891         if ( op->o_conn &&
 892                         ( ( sendok & LDAP_BACK_SENDOK )
 893                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
 894         {
 895                 send_ldap_result( op, rs );
 896         }
 897         if ( match ) {
 898                 if ( rs->sr_matched != match ) {
 899                         free( (char *)rs->sr_matched );
 900                 }
 901                 rs->sr_matched = NULL;
 902                 ldap_memfree( match );
 903         }
 904         if ( text ) {
 905                 ldap_memfree( text );
 906         }
 907         rs->sr_text = NULL;
 908         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
 909 }
 910
 911 /* return true if bound, false if failed */
 912 int
 913 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 914 {
 915         int             rc = 0;
 916         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 917
 918         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 919
 920         if ( (*lcp)->lc_refcnt == 1 ) {
 921                 Debug( LDAP_DEBUG_ANY,
 922                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
 923                         op->o_log_prefix, li->li_uri,
 924                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
 925                                 "" : (*lcp)->lc_bound_ndn.bv_val );
 926
 927                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
 928                 (*lcp)->lc_ld = NULL;
 929                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
 930
 931                 /* lc here must be the regular lc, reset and ready for init */
 932                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
 933                 if ( rc == LDAP_SUCCESS ) {
 934                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
 935                         if ( rc == 0 ) {
 936                                 *lcp = NULL;
 937                         }
 938                 }
 939         }
 940
 941         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 942
 943         return rc;
 944 }
 945
 946 static int
 947 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs )
 948 {
 949         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 950         struct berval   binddn = slap_empty_bv;
 951         struct berval   bindcred = slap_empty_bv;
 952         int             dobind = 0;
 953         int             msgid;
 954         int             rc;
 955
 956         /*
 957          * FIXME: we need to let clients use proxyAuthz
 958          * otherwise we cannot do symmetric pools of servers;
 959          * we have to live with the fact that a user can
 960          * authorize itself as any ID that is allowed
 961          * by the authzTo directive of the "proxyauthzdn".
 962          */
 963         /*
 964          * NOTE: current Proxy Authorization specification
 965          * and implementation do not allow proxy authorization
 966          * control to be provided with Bind requests
 967          */
 968         /*
 969          * if no bind took place yet, but the connection is bound
 970          * and the "proxyauthzdn" is set, then bind as
 971          * "proxyauthzdn" and explicitly add the proxyAuthz
 972          * control to every operation with the dn bound
 973          * to the connection as control value.
 974          */
 975
 976         /* bind as proxyauthzdn only if no idassert mode
 977          * is requested, or if the client's identity
 978          * is authorized */
 979         switch ( li->li_idassert_mode ) {
 980         case LDAP_BACK_IDASSERT_LEGACY:
 981                 if ( !BER_BVISNULL( &op->o_conn->c_ndn ) && !BER_BVISEMPTY( &op->o_conn->c_ndn ) ) {
 982                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
 983                         {
 984                                 binddn = li->li_idassert_authcDN;
 985                                 bindcred = li->li_idassert_passwd;
 986                                 dobind = 1;
 987                         }
 988                 }
 989                 break;
 990
 991         default:
 992                 /* NOTE: rootdn can always idassert */
 993                 if ( li->li_idassert_authz && !be_isroot( op ) ) {
 994                         struct berval authcDN;
 995
 996                         if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
 997                                 authcDN = slap_empty_bv;
 998
 999                         } else {
1000                                 authcDN = op->o_conn->c_ndn;
1001                         }
1002                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1003                                         &authcDN, &authcDN );
1004                         if ( rs->sr_err != LDAP_SUCCESS ) {
1005                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1006                                         send_ldap_result( op, rs );
1007                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1008
1009                                 } else {
1010                                         rs->sr_err = LDAP_SUCCESS;
1011                                         binddn = slap_empty_bv;
1012                                         bindcred = slap_empty_bv;
1013                                         break;
1014                                 }
1015
1016                                 goto done;
1017                         }
1018                 }
1019
1020                 binddn = li->li_idassert_authcDN;
1021                 bindcred = li->li_idassert_passwd;
1022                 dobind = 1;
1023                 break;
1024         }
1025
1026         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1027 #ifdef HAVE_CYRUS_SASL
1028                 void            *defaults = NULL;
1029                 struct berval   authzID = BER_BVNULL;
1030                 int             freeauthz = 0;
1031
1032                 /* if SASL supports native authz, prepare for it */
1033                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1034                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1035                 {
1036                         switch ( li->li_idassert_mode ) {
1037                         case LDAP_BACK_IDASSERT_OTHERID:
1038                         case LDAP_BACK_IDASSERT_OTHERDN:
1039                                 authzID = li->li_idassert_authzID;
1040                                 break;
1041
1042                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1043                                 BER_BVSTR( &authzID, "dn:" );
1044                                 break;
1045
1046                         case LDAP_BACK_IDASSERT_SELF:
1047                                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1048                                         /* connection is not authc'd, so don't idassert */
1049                                         BER_BVSTR( &authzID, "dn:" );
1050                                         break;
1051                                 }
1052                                 authzID.bv_len = STRLENOF( "dn:" ) + op->o_conn->c_ndn.bv_len;
1053                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1054                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1055                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1056                                                 op->o_conn->c_ndn.bv_val, op->o_conn->c_ndn.bv_len + 1 );
1057                                 freeauthz = 1;
1058                                 break;
1059
1060                         default:
1061                                 break;
1062                         }
1063                 }
1064
1065                 if ( li->li_idassert_secprops != NULL ) {
1066                         rs->sr_err = ldap_set_option( lc->lc_ld,
1067                                 LDAP_OPT_X_SASL_SECPROPS,
1068                                 (void *)li->li_idassert_secprops );
1069
1070                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1071                                 send_ldap_result( op, rs );
1072                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1073                                 goto done;
1074                         }
1075                 }
1076
1077                 defaults = lutil_sasl_defaults( lc->lc_ld,
1078                                 li->li_idassert_sasl_mech.bv_val,
1079                                 li->li_idassert_sasl_realm.bv_val,
1080                                 li->li_idassert_authcID.bv_val,
1081                                 li->li_idassert_passwd.bv_val,
1082                                 authzID.bv_val );
1083
1084                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1085                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1086                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1087                                 defaults );
1088
1089                 rs->sr_err = slap_map_api2result( rs );
1090                 if ( rs->sr_err != LDAP_SUCCESS ) {
1091                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1092                         send_ldap_result( op, rs );
1093
1094                 } else {
1095                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1096                 }
1097
1098                 lutil_sasl_freedefs( defaults );
1099                 if ( freeauthz ) {
1100                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1101                 }
1102
1103                 goto done;
1104 #endif /* HAVE_CYRUS_SASL */
1105         }
1106
1107         switch ( li->li_idassert_authmethod ) {
1108         case LDAP_AUTH_NONE:
1109                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1110                 goto done;
1111
1112         case LDAP_AUTH_SIMPLE:
1113                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1114                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1115                                 &bindcred, NULL, NULL, &msgid );
1116                 break;
1117
1118         default:
1119                 /* unsupported! */
1120                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1121                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1122                 send_ldap_result( op, rs );
1123                 goto done;
1124         }
1125
1126         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
1127         if ( rc == LDAP_SUCCESS ) {
1128                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1129         }
1130 done:;
1131         return LDAP_BACK_CONN_ISBOUND( lc );
1132 }
1133
1134 /*
1135  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1136  * to existing server-side controls if required; if not,
1137  * the existing server-side controls are placed in *pctrls.
1138  * The caller, after using the controls in client API
1139  * operations, if ( *pctrls != op->o_ctrls ), should
1140  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1141  * The function returns success if the control could
1142  * be added if required, or if it did nothing; in the future,
1143  * it might return some error if it failed.
1144  *
1145  * if no bind took place yet, but the connection is bound
1146  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1147  * and explicitly add proxyAuthz the control to every operation
1148  * with the dn bound to the connection as control value.
1149  *
1150  * If no server-side controls are defined for the operation,
1151  * simply add the proxyAuthz control; otherwise, if the
1152  * proxyAuthz control is not already set, add it as
1153  * the first one
1154  *
1155  * FIXME: is controls order significant for security?
1156  * ANSWER: controls ordering and interoperability
1157  * must be indicated by the specs of each control; if none
1158  * is specified, the order is irrelevant.
1159  */
1160 int
1161 ldap_back_proxy_authz_ctrl(
1162                 ldapconn_t      *lc,
1163                 Operation       *op,
1164                 SlapReply       *rs,
1165                 LDAPControl     ***pctrls )
1166 {
1167         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1168         LDAPControl     **ctrls = NULL;
1169         int             i = 0,
1170                         mode;
1171         struct berval   assertedID;
1172
1173         *pctrls = NULL;
1174
1175         rs->sr_err = LDAP_SUCCESS;
1176
1177         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1178          * but if it is not set this test fails.  We need a different
1179          * means to detect if idassert is enabled */
1180         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1181                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1182         {
1183                 goto done;
1184         }
1185
1186         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1187                 goto done;
1188         }
1189
1190         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1191                 if ( op->o_proxy_authz ) {
1192                         /*
1193                          * FIXME: we do not want to perform proxyAuthz
1194                          * on behalf of the client, because this would
1195                          * be performed with "proxyauthzdn" privileges.
1196                          *
1197                          * This might actually be too strict, since
1198                          * the "proxyauthzdn" authzTo, and each entry's
1199                          * authzFrom attributes may be crafted
1200                          * to avoid unwanted proxyAuthz to take place.
1201                          */
1202 #if 0
1203                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1204                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1205 #endif
1206                         goto done;
1207                 }
1208
1209                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1210                         goto done;
1211                 }
1212
1213                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1214                         goto done;
1215                 }
1216
1217                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1218                         goto done;
1219                 }
1220
1221         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1222                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1223                                 /* && ( !BER_BVISNULL( &op->o_conn->c_ndn )
1224                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1225                 {
1226                         /* already asserted in SASL via native authz */
1227                         /* NOTE: the test on lc->lc_bound is used to trap
1228                          * native authorization of anonymous users,
1229                          * since in that case op->o_conn->c_ndn is NULL */
1230                         goto done;
1231                 }
1232
1233         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1234                 int             rc;
1235                 struct berval authcDN;
1236
1237                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1238                         authcDN = slap_empty_bv;
1239                 } else {
1240                         authcDN = op->o_conn->c_ndn;
1241                 }
1242                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1243                                 &authcDN, & authcDN );
1244                 if ( rc != LDAP_SUCCESS ) {
1245                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1246                         {
1247                                 /* op->o_conn->c_ndn is not authorized
1248                                  * to use idassert */
1249                                 return rc;
1250                         }
1251                         return rs->sr_err;
1252                 }
1253         }
1254
1255         if ( op->o_proxy_authz ) {
1256                 /*
1257                  * FIXME: we can:
1258                  * 1) ignore the already set proxyAuthz control
1259                  * 2) leave it in place, and don't set ours
1260                  * 3) add both
1261                  * 4) reject the operation
1262                  *
1263                  * option (4) is very drastic
1264                  * option (3) will make the remote server reject
1265                  * the operation, thus being equivalent to (4)
1266                  * option (2) will likely break the idassert
1267                  * assumptions, so we cannot accept it;
1268                  * option (1) means that we are contradicting
1269                  * the client's reques.
1270                  *
1271                  * I think (4) is the only correct choice.
1272                  */
1273                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1274                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1275         }
1276
1277         if ( op->o_is_auth_check ) {
1278                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1279
1280         } else {
1281                 mode = li->li_idassert_mode;
1282         }
1283
1284         switch ( mode ) {
1285         case LDAP_BACK_IDASSERT_LEGACY:
1286         case LDAP_BACK_IDASSERT_SELF:
1287                 /* original behavior:
1288                  * assert the client's identity */
1289                 if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1290                         assertedID = slap_empty_bv;
1291                 } else {
1292                         assertedID = op->o_conn->c_ndn;
1293                 }
1294                 break;
1295
1296         case LDAP_BACK_IDASSERT_ANONYMOUS:
1297                 /* assert "anonymous" */
1298                 assertedID = slap_empty_bv;
1299                 break;
1300
1301         case LDAP_BACK_IDASSERT_NOASSERT:
1302                 /* don't assert; bind as proxyauthzdn */
1303                 goto done;
1304
1305         case LDAP_BACK_IDASSERT_OTHERID:
1306         case LDAP_BACK_IDASSERT_OTHERDN:
1307                 /* assert idassert DN */
1308                 assertedID = li->li_idassert_authzID;
1309                 break;
1310
1311         default:
1312                 assert( 0 );
1313         }
1314
1315         if ( BER_BVISNULL( &assertedID ) ) {
1316                 assertedID = slap_empty_bv;
1317         }
1318
1319         if ( op->o_ctrls ) {
1320                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1321                         /* just count ctrls */ ;
1322         }
1323
1324         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
1325         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
1326
1327         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1328         ctrls[ 0 ]->ldctl_iscritical = 1;
1329
1330         switch ( li->li_idassert_mode ) {
1331         /* already in u:ID or dn:DN form */
1332         case LDAP_BACK_IDASSERT_OTHERID:
1333         case LDAP_BACK_IDASSERT_OTHERDN:
1334                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
1335                 break;
1336
1337         /* needs the dn: prefix */
1338         default:
1339                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1340                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
1341                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1342                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1343                                 assertedID.bv_val, assertedID.bv_len + 1 );
1344                 break;
1345         }
1346
1347         if ( op->o_ctrls ) {
1348                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1349                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1350                 }
1351         }
1352         ctrls[ i + 1 ] = NULL;
1353
1354 done:;
1355         if ( ctrls == NULL ) {
1356                 ctrls = op->o_ctrls;
1357         }
1358
1359         *pctrls = ctrls;
1360
1361         return rs->sr_err;
1362 }
1363
1364 int
1365 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1366 {
1367         LDAPControl     **ctrls = *pctrls;
1368
1369         /* we assume that the first control is the proxyAuthz
1370          * added by back-ldap, so it's the only one we explicitly
1371          * free */
1372         if ( ctrls && ctrls != op->o_ctrls ) {
1373                 assert( ctrls[ 0 ] != NULL );
1374
1375                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1376                         free( ctrls[ 0 ]->ldctl_value.bv_val );
1377                 }
1378
1379                 free( ctrls[ 0 ] );
1380                 free( ctrls );
1381         }
1382
1383         *pctrls = NULL;
1384
1385         return 0;
1386 }