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_UNWILLING_TO_PERFORM;
 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         if ( vers == 0 ) {
 419                 /* assume it's an internal op; set to LDAPv3 */
 420                 vers = LDAP_VERSION3;
 421         }
 422         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&vers );
 423
 424         /* automatically chase referrals ("[dont-]chase-referrals" statement) */
 425         if ( LDAP_BACK_CHASE_REFERRALS( li ) ) {
 426                 ldap_set_option( ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON );
 427         }
 428
 429 #ifdef HAVE_TLS
 430         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 431                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 432         if ( rs->sr_err != LDAP_SUCCESS ) {
 433                 ldap_unbind_ext( ld, NULL, NULL );
 434                 goto error_return;
 435         }
 436 #endif /* HAVE_TLS */
 437
 438         if ( *lcp == NULL ) {
 439                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 440                 (*lcp)->lc_flags= li->li_flags;
 441         }
 442         (*lcp)->lc_ld = ld;
 443         (*lcp)->lc_refcnt = 1;
 444 #ifdef HAVE_TLS
 445         if ( is_tls ) {
 446                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 447         } else {
 448                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 449         }
 450 #endif /* HAVE_TLS */
 451
 452 error_return:;
 453         if ( rs->sr_err != LDAP_SUCCESS ) {
 454                 rs->sr_err = slap_map_api2result( rs );
 455                 if ( sendok & LDAP_BACK_SENDERR ) {
 456                         if ( rs->sr_text == NULL ) {
 457                                 rs->sr_text = "ldap_initialize() failed";
 458                         }
 459                         send_ldap_result( op, rs );
 460                         rs->sr_text = NULL;
 461                 }
 462         }
 463
 464         return rs->sr_err;
 465 }
 466
 467 ldapconn_t *
 468 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 469 {
 470         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 471         ldapconn_t      *lc,
 472                         lc_curr = { 0 };
 473         int             refcnt = 1;
 474
 475         /* Internal searches are privileged and shared. So is root. */
 476         if ( op->o_do_not_cache || be_isroot( op ) ) {
 477                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 478                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 479                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 480
 481         } else {
 482                 lc_curr.lc_local_ndn = op->o_ndn;
 483                 /* Explicit binds must not be shared */
 484                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 485                         lc_curr.lc_conn = op->o_conn;
 486
 487                 } else {
 488                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 489                 }
 490         }
 491
 492         /* Searches for a ldapconn in the avl tree */
 493         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 494
 495         lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 496                         (caddr_t)&lc_curr, ldap_back_conn_cmp );
 497         if ( lc != NULL ) {
 498                 refcnt = ++lc->lc_refcnt;
 499         }
 500         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 501
 502         /* Looks like we didn't get a bind. Open a new session... */
 503         if ( lc == NULL ) {
 504                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 505                         return NULL;
 506                 }
 507
 508                 lc->lc_conn = lc_curr.lc_conn;
 509                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 510
 511                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 512                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 513                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 514                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 515
 516                 } else {
 517                         BER_BVZERO( &lc->lc_cred );
 518                         BER_BVZERO( &lc->lc_bound_ndn );
 519 #if 0
 520                         /* FIXME: if we set lc_bound_ndn = o_ndn
 521                          * we end up with a bind with DN but no password! */
 522                         if ( !BER_BVISEMPTY( &op->o_ndn )
 523                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 524                         {
 525                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 526                         }
 527 #endif
 528                 }
 529
 530 #ifdef HAVE_TLS
 531                 /* if start TLS failed but it was not mandatory,
 532                  * check if the non-TLS connection was already
 533                  * in cache; in case, destroy the newly created
 534                  * connection and use the existing one */
 535                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 536                                 && !ldap_tls_inplace( lc->lc_ld ) )
 537                 {
 538                         ldapconn_t *tmplc;
 539
 540                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 541                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 542                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 543                                         (caddr_t)&lc_curr, ldap_back_conn_cmp );
 544                         if ( tmplc != NULL ) {
 545                                 refcnt = ++tmplc->lc_refcnt;
 546                                 ldap_back_conn_free( lc );
 547                                 lc = tmplc;
 548                         }
 549                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 550
 551                         if ( tmplc != NULL ) {
 552                                 goto done;
 553                         }
 554                 }
 555 #endif /* HAVE_TLS */
 556
 557                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 558
 559                 /* Inserts the newly created ldapconn in the avl tree */
 560                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 561
 562                 assert( lc->lc_refcnt == 1 );
 563                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 564                         ldap_back_conn_cmp, ldap_back_conn_dup );
 565
 566 #if PRINT_CONNTREE > 0
 567                 myprint( li->li_conninfo.lai_tree );
 568 #endif /* PRINT_CONNTREE */
 569
 570                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 571
 572                 Debug( LDAP_DEBUG_TRACE,
 573                         "=>ldap_back_getconn: conn %p inserted (refcnt=%u)\n",
 574                         (void *)lc, refcnt, 0 );
 575
 576                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 577                 if ( rs->sr_err != 0 ) {
 578                         ldap_back_conn_free( lc );
 579                         rs->sr_err = LDAP_OTHER;
 580                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 581                                 send_ldap_error( op, rs, LDAP_OTHER,
 582                                         "internal server error" );
 583                         }
 584                         return NULL;
 585                 }
 586
 587         } else {
 588                 if ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout ) {
 589                         /* in case of failure, it frees/taints lc and sets it to NULL */
 590                         if ( ldap_back_retry( &lc, op, rs, sendok ) ) {
 591                                 lc = NULL;
 592                         }
 593                 }
 594
 595                 if ( lc ) {
 596                         Debug( LDAP_DEBUG_TRACE,
 597                                 "=>ldap_back_getconn: conn %p fetched (refcnt=%u)\n",
 598                                 (void *)lc, refcnt, 0 );
 599                 }
 600         }
 601
 602         if ( li->li_idle_timeout && lc ) {
 603                 lc->lc_time = op->o_time;
 604         }
 605
 606 done:;
 607         return lc;
 608 }
 609
 610 void
 611 ldap_back_release_conn(
 612         Operation               *op,
 613         SlapReply               *rs,
 614         ldapconn_t              *lc )
 615 {
 616         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 617
 618         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 619         assert( lc->lc_refcnt > 0 );
 620         lc->lc_refcnt--;
 621         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 622 }
 623
 624 /*
 625  * ldap_back_dobind
 626  *
 627  * Note: as the check for the value of lc->lc_bound was already here, I removed
 628  * it from all the callers, and I made the function return the flag, so
 629  * it can be used to simplify the check.
 630  *
 631  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 632  */
 633 static int
 634 ldap_back_dobind_int(
 635         ldapconn_t              *lc,
 636         Operation               *op,
 637         SlapReply               *rs,
 638         ldap_back_send_t        sendok,
 639         int                     retries,
 640         int                     dolock )
 641 {
 642         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 643
 644         int             rc = LDAP_BACK_CONN_ISBOUND( lc );
 645         ber_int_t       msgid;
 646
 647         assert( retries >= 0 );
 648
 649         if ( rc ) {
 650                 return rc;
 651         }
 652
 653         /*
 654          * FIXME: we need to let clients use proxyAuthz
 655          * otherwise we cannot do symmetric pools of servers;
 656          * we have to live with the fact that a user can
 657          * authorize itself as any ID that is allowed
 658          * by the authzTo directive of the "proxyauthzdn".
 659          */
 660         /*
 661          * NOTE: current Proxy Authorization specification
 662          * and implementation do not allow proxy authorization
 663          * control to be provided with Bind requests
 664          */
 665         /*
 666          * if no bind took place yet, but the connection is bound
 667          * and the "idassert-authcDN" (or other ID) is set,
 668          * then bind as the asserting identity and explicitly
 669          * add the proxyAuthz control to every operation with the
 670          * dn bound to the connection as control value.
 671          * This is done also if this is the authrizing backend,
 672          * but the "override" flag is given to idassert.
 673          * It allows to use SASL bind and yet proxyAuthz users
 674          */
 675         if ( op->o_conn != NULL &&
 676                         !op->o_do_not_cache &&
 677                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 678                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 679         {
 680                 (void)ldap_back_proxy_authz_bind( lc, op, rs );
 681                 goto done;
 682         }
 683
 684 #ifdef HAVE_CYRUS_SASL
 685         if ( LDAP_BACK_CONN_ISPRIV( lc )
 686                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 687         {
 688                 void            *defaults = NULL;
 689
 690                 if ( li->li_acl_secprops != NULL ) {
 691                         rc = ldap_set_option( lc->lc_ld,
 692                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 693
 694                         if ( rc != LDAP_OPT_SUCCESS ) {
 695                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 696                                         "(%s,SECPROPS,\"%s\") failed!\n",
 697                                         li->li_uri, li->li_acl_secprops, 0 );
 698                                 goto done;
 699                         }
 700                 }
 701
 702                 defaults = lutil_sasl_defaults( lc->lc_ld,
 703                                 li->li_acl_sasl_mech.bv_val,
 704                                 li->li_acl_sasl_realm.bv_val,
 705                                 li->li_acl_authcID.bv_val,
 706                                 li->li_acl_passwd.bv_val,
 707                                 NULL );
 708
 709                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 710                                 li->li_acl_authcDN.bv_val,
 711                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 712                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 713                                 defaults );
 714
 715                 lutil_sasl_freedefs( defaults );
 716
 717                 rs->sr_err = slap_map_api2result( rs );
 718                 if ( rs->sr_err != LDAP_SUCCESS ) {
 719                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 720                         send_ldap_result( op, rs );
 721
 722                 } else {
 723                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 724                 }
 725                 goto done;
 726         }
 727 #endif /* HAVE_CYRUS_SASL */
 728
 729 retry:;
 730         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 731                         lc->lc_bound_ndn.bv_val,
 732                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 733                         NULL, NULL, &msgid );
 734
 735         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 736                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 737                         if ( dolock ) {
 738                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 739                         }
 740
 741                         assert( lc->lc_refcnt > 0 );
 742                         if ( lc->lc_refcnt == 1 ) {
 743                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 744                                 lc->lc_ld = NULL;
 745
 746                                 /* lc here must be the regular lc, reset and ready for init */
 747                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 748                         }
 749                         if ( dolock ) {
 750                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 751                         }
 752                         if ( rs->sr_err == LDAP_SUCCESS ) {
 753                                 if ( retries > 0 ) {
 754                                         retries--;
 755                                 }
 756                                 goto retry;
 757                         }
 758                 }
 759
 760                 ldap_back_freeconn( op, lc, dolock );
 761                 rs->sr_err = slap_map_api2result( rs );
 762
 763                 return 0;
 764         }
 765
 766         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
 767         if ( rc == LDAP_SUCCESS ) {
 768                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 769
 770         } else {
 771                 ldap_back_release_conn( op, rs, lc );
 772         }
 773
 774 done:;
 775         rc = LDAP_BACK_CONN_ISBOUND( lc );
 776
 777         return rc;
 778 }
 779
 780 int
 781 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 782 {
 783         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 784
 785         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
 786 }
 787
 788 /*
 789  * ldap_back_default_rebind
 790  *
 791  * This is a callback used for chasing referrals using the same
 792  * credentials as the original user on this session.
 793  */
 794 static int
 795 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 796         ber_int_t msgid, void *params )
 797 {
 798         ldapconn_t      *lc = (ldapconn_t *)params;
 799
 800 #ifdef HAVE_TLS
 801         /* ... otherwise we couldn't get here */
 802         assert( lc != NULL );
 803
 804         if ( !ldap_tls_inplace( ld ) ) {
 805                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
 806                                 rc;
 807                 const char      *text = NULL;
 808
 809                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
 810                         LDAP_BACK_RETRY_DEFAULT, &text );
 811                 if ( rc != LDAP_SUCCESS ) {
 812                         return rc;
 813                 }
 814         }
 815 #endif /* HAVE_TLS */
 816
 817         /* FIXME: add checks on the URL/identity? */
 818
 819         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
 820                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
 821 }
 822
 823 int
 824 ldap_back_op_result(
 825                 ldapconn_t              *lc,
 826                 Operation               *op,
 827                 SlapReply               *rs,
 828                 ber_int_t               msgid,
 829                 time_t                  timeout,
 830                 ldap_back_send_t        sendok )
 831 {
 832         char            *match = NULL;
 833         LDAPMessage     *res = NULL;
 834         char            *text = NULL;
 835
 836 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 837
 838         rs->sr_text = NULL;
 839         rs->sr_matched = NULL;
 840
 841         /* if the error recorded in the reply corresponds
 842          * to a successful state, get the error from the
 843          * remote server response */
 844         if ( ERR_OK( rs->sr_err ) ) {
 845                 int             rc;
 846                 struct timeval  tv;
 847
 848                 if ( timeout ) {
 849                         tv.tv_sec = timeout;
 850                         tv.tv_usec = 0;
 851
 852                 } else {
 853                         LDAP_BACK_TV_SET( &tv );
 854                 }
 855
 856 retry:;
 857                 /* if result parsing fails, note the failure reason */
 858                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
 859                 switch ( rc ) {
 860                 case 0:
 861                         if ( timeout ) {
 862                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
 863                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
 864                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
 865                                 rs->sr_text = "Operation timed out";
 866                                 break;
 867                         }
 868
 869                         LDAP_BACK_TV_SET( &tv );
 870                         ldap_pvt_thread_yield();
 871                         goto retry;
 872
 873                 case -1:
 874                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
 875                                         &rs->sr_err );
 876                         break;
 877
 878
 879                 /* otherwise get the result; if it is not
 880                  * LDAP_SUCCESS, record it in the reply
 881                  * structure (this includes
 882                  * LDAP_COMPARE_{TRUE|FALSE}) */
 883                 default:
 884                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
 885                                         &match, &text, NULL, NULL, 1 );
 886 #ifndef LDAP_NULL_IS_NULL
 887                         if ( match != NULL && match[ 0 ] == '\0' ) {
 888                                 ldap_memfree( match );
 889                                 match = NULL;
 890                         }
 891                         if ( text != NULL && text[ 0 ] == '\0' ) {
 892                                 ldap_memfree( text );
 893                                 text = NULL;
 894                         }
 895 #endif /* LDAP_NULL_IS_NULL */
 896                         rs->sr_text = text;
 897                         if ( rc != LDAP_SUCCESS ) {
 898                                 rs->sr_err = rc;
 899                         }
 900                 }
 901         }
 902
 903         /* if the error in the reply structure is not
 904          * LDAP_SUCCESS, try to map it from client
 905          * to server error */
 906         if ( !ERR_OK( rs->sr_err ) ) {
 907                 rs->sr_err = slap_map_api2result( rs );
 908
 909                 /* internal ops ( op->o_conn == NULL )
 910                  * must not reply to client */
 911                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 912
 913                         /* record the (massaged) matched
 914                          * DN into the reply structure */
 915                         rs->sr_matched = match;
 916                 }
 917         }
 918         if ( op->o_conn &&
 919                         ( ( sendok & LDAP_BACK_SENDOK )
 920                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
 921         {
 922                 send_ldap_result( op, rs );
 923         }
 924         if ( match ) {
 925                 if ( rs->sr_matched != match ) {
 926                         free( (char *)rs->sr_matched );
 927                 }
 928                 rs->sr_matched = NULL;
 929                 ldap_memfree( match );
 930         }
 931         if ( text ) {
 932                 ldap_memfree( text );
 933         }
 934         rs->sr_text = NULL;
 935         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
 936 }
 937
 938 /* return true if bound, false if failed */
 939 int
 940 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 941 {
 942         int             rc = 0;
 943         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 944
 945         assert( lcp != NULL );
 946         assert( *lcp != NULL );
 947
 948         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 949
 950         if ( (*lcp)->lc_refcnt == 1 ) {
 951                 Debug( LDAP_DEBUG_ANY,
 952                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
 953                         op->o_log_prefix, li->li_uri,
 954                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
 955                                 "" : (*lcp)->lc_bound_ndn.bv_val );
 956
 957                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
 958                 (*lcp)->lc_ld = NULL;
 959                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
 960
 961                 /* lc here must be the regular lc, reset and ready for init */
 962                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
 963                 if ( rc != LDAP_SUCCESS ) {
 964                         rc = 0;
 965                         *lcp = NULL;
 966
 967                 } else {
 968                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
 969                         if ( rc == 0 ) {
 970                                 *lcp = NULL;
 971                         }
 972                 }
 973         }
 974
 975         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 976
 977         return rc;
 978 }
 979
 980 static int
 981 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs )
 982 {
 983         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 984         struct berval   binddn = slap_empty_bv;
 985         struct berval   bindcred = slap_empty_bv;
 986         struct berval   ndn;
 987         int             dobind = 0;
 988         int             msgid;
 989         int             rc;
 990
 991         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
 992                 ndn = op->o_conn->c_ndn;
 993
 994         } else {
 995                 ndn = op->o_ndn;
 996         }
 997
 998         /*
 999          * FIXME: we need to let clients use proxyAuthz
1000          * otherwise we cannot do symmetric pools of servers;
1001          * we have to live with the fact that a user can
1002          * authorize itself as any ID that is allowed
1003          * by the authzTo directive of the "proxyauthzdn".
1004          */
1005         /*
1006          * NOTE: current Proxy Authorization specification
1007          * and implementation do not allow proxy authorization
1008          * control to be provided with Bind requests
1009          */
1010         /*
1011          * if no bind took place yet, but the connection is bound
1012          * and the "proxyauthzdn" is set, then bind as
1013          * "proxyauthzdn" and explicitly add the proxyAuthz
1014          * control to every operation with the dn bound
1015          * to the connection as control value.
1016          */
1017
1018         /* bind as proxyauthzdn only if no idassert mode
1019          * is requested, or if the client's identity
1020          * is authorized */
1021         switch ( li->li_idassert_mode ) {
1022         case LDAP_BACK_IDASSERT_LEGACY:
1023                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1024                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1025                         {
1026                                 binddn = li->li_idassert_authcDN;
1027                                 bindcred = li->li_idassert_passwd;
1028                                 dobind = 1;
1029                         }
1030                 }
1031                 break;
1032
1033         default:
1034                 /* NOTE: rootdn can always idassert */
1035                 if ( li->li_idassert_authz && !be_isroot( op ) ) {
1036                         struct berval authcDN;
1037
1038                         if ( BER_BVISNULL( &ndn ) ) {
1039                                 authcDN = slap_empty_bv;
1040
1041                         } else {
1042                                 authcDN = ndn;
1043                         }
1044                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1045                                         &authcDN, &authcDN );
1046                         if ( rs->sr_err != LDAP_SUCCESS ) {
1047                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1048                                         send_ldap_result( op, rs );
1049                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1050
1051                                 } else {
1052                                         rs->sr_err = LDAP_SUCCESS;
1053                                         binddn = slap_empty_bv;
1054                                         bindcred = slap_empty_bv;
1055                                         break;
1056                                 }
1057
1058                                 goto done;
1059                         }
1060                 }
1061
1062                 binddn = li->li_idassert_authcDN;
1063                 bindcred = li->li_idassert_passwd;
1064                 dobind = 1;
1065                 break;
1066         }
1067
1068         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1069 #ifdef HAVE_CYRUS_SASL
1070                 void            *defaults = NULL;
1071                 struct berval   authzID = BER_BVNULL;
1072                 int             freeauthz = 0;
1073
1074                 /* if SASL supports native authz, prepare for it */
1075                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1076                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1077                 {
1078                         switch ( li->li_idassert_mode ) {
1079                         case LDAP_BACK_IDASSERT_OTHERID:
1080                         case LDAP_BACK_IDASSERT_OTHERDN:
1081                                 authzID = li->li_idassert_authzID;
1082                                 break;
1083
1084                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1085                                 BER_BVSTR( &authzID, "dn:" );
1086                                 break;
1087
1088                         case LDAP_BACK_IDASSERT_SELF:
1089                                 if ( BER_BVISNULL( &ndn ) ) {
1090                                         /* connection is not authc'd, so don't idassert */
1091                                         BER_BVSTR( &authzID, "dn:" );
1092                                         break;
1093                                 }
1094                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1095                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1096                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1097                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1098                                                 ndn.bv_val, ndn.bv_len + 1 );
1099                                 freeauthz = 1;
1100                                 break;
1101
1102                         default:
1103                                 break;
1104                         }
1105                 }
1106
1107                 if ( li->li_idassert_secprops != NULL ) {
1108                         rs->sr_err = ldap_set_option( lc->lc_ld,
1109                                 LDAP_OPT_X_SASL_SECPROPS,
1110                                 (void *)li->li_idassert_secprops );
1111
1112                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1113                                 send_ldap_result( op, rs );
1114                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1115                                 goto done;
1116                         }
1117                 }
1118
1119                 defaults = lutil_sasl_defaults( lc->lc_ld,
1120                                 li->li_idassert_sasl_mech.bv_val,
1121                                 li->li_idassert_sasl_realm.bv_val,
1122                                 li->li_idassert_authcID.bv_val,
1123                                 li->li_idassert_passwd.bv_val,
1124                                 authzID.bv_val );
1125
1126                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1127                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1128                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1129                                 defaults );
1130
1131                 rs->sr_err = slap_map_api2result( rs );
1132                 if ( rs->sr_err != LDAP_SUCCESS ) {
1133                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1134                         send_ldap_result( op, rs );
1135
1136                 } else {
1137                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1138                 }
1139
1140                 lutil_sasl_freedefs( defaults );
1141                 if ( freeauthz ) {
1142                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1143                 }
1144
1145                 goto done;
1146 #endif /* HAVE_CYRUS_SASL */
1147         }
1148
1149         switch ( li->li_idassert_authmethod ) {
1150         case LDAP_AUTH_NONE:
1151                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1152                 goto done;
1153
1154         case LDAP_AUTH_SIMPLE:
1155                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1156                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1157                                 &bindcred, NULL, NULL, &msgid );
1158                 break;
1159
1160         default:
1161                 /* unsupported! */
1162                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1163                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1164                 send_ldap_result( op, rs );
1165                 goto done;
1166         }
1167
1168         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
1169         if ( rc == LDAP_SUCCESS ) {
1170                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1171         }
1172 done:;
1173         return LDAP_BACK_CONN_ISBOUND( lc );
1174 }
1175
1176 /*
1177  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1178  * to existing server-side controls if required; if not,
1179  * the existing server-side controls are placed in *pctrls.
1180  * The caller, after using the controls in client API
1181  * operations, if ( *pctrls != op->o_ctrls ), should
1182  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1183  * The function returns success if the control could
1184  * be added if required, or if it did nothing; in the future,
1185  * it might return some error if it failed.
1186  *
1187  * if no bind took place yet, but the connection is bound
1188  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1189  * and explicitly add proxyAuthz the control to every operation
1190  * with the dn bound to the connection as control value.
1191  *
1192  * If no server-side controls are defined for the operation,
1193  * simply add the proxyAuthz control; otherwise, if the
1194  * proxyAuthz control is not already set, add it as
1195  * the first one
1196  *
1197  * FIXME: is controls order significant for security?
1198  * ANSWER: controls ordering and interoperability
1199  * must be indicated by the specs of each control; if none
1200  * is specified, the order is irrelevant.
1201  */
1202 int
1203 ldap_back_proxy_authz_ctrl(
1204                 ldapconn_t      *lc,
1205                 Operation       *op,
1206                 SlapReply       *rs,
1207                 LDAPControl     ***pctrls )
1208 {
1209         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1210         LDAPControl     **ctrls = NULL;
1211         int             i = 0,
1212                         mode;
1213         struct berval   assertedID,
1214                         ndn;
1215
1216         *pctrls = NULL;
1217
1218         rs->sr_err = LDAP_SUCCESS;
1219
1220         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1221          * but if it is not set this test fails.  We need a different
1222          * means to detect if idassert is enabled */
1223         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1224                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1225         {
1226                 goto done;
1227         }
1228
1229         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1230                 goto done;
1231         }
1232
1233         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1234                 ndn = op->o_conn->c_ndn;
1235
1236         } else {
1237                 ndn = op->o_ndn;
1238         }
1239
1240         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1241                 if ( op->o_proxy_authz ) {
1242                         /*
1243                          * FIXME: we do not want to perform proxyAuthz
1244                          * on behalf of the client, because this would
1245                          * be performed with "proxyauthzdn" privileges.
1246                          *
1247                          * This might actually be too strict, since
1248                          * the "proxyauthzdn" authzTo, and each entry's
1249                          * authzFrom attributes may be crafted
1250                          * to avoid unwanted proxyAuthz to take place.
1251                          */
1252 #if 0
1253                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1254                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1255 #endif
1256                         goto done;
1257                 }
1258
1259                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1260                         goto done;
1261                 }
1262
1263                 if ( BER_BVISNULL( &ndn ) ) {
1264                         goto done;
1265                 }
1266
1267                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1268                         goto done;
1269                 }
1270
1271         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1272                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1273                                 /* && ( !BER_BVISNULL( &ndn )
1274                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1275                 {
1276                         /* already asserted in SASL via native authz */
1277                         /* NOTE: the test on lc->lc_bound is used to trap
1278                          * native authorization of anonymous users,
1279                          * since in that case ndn is NULL */
1280                         goto done;
1281                 }
1282
1283         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1284                 int             rc;
1285                 struct berval authcDN;
1286
1287                 if ( BER_BVISNULL( &ndn ) ) {
1288                         authcDN = slap_empty_bv;
1289                 } else {
1290                         authcDN = ndn;
1291                 }
1292                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1293                                 &authcDN, & authcDN );
1294                 if ( rc != LDAP_SUCCESS ) {
1295                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1296                         {
1297                                 /* ndn is not authorized
1298                                  * to use idassert */
1299                                 return rc;
1300                         }
1301                         return rs->sr_err;
1302                 }
1303         }
1304
1305         if ( op->o_proxy_authz ) {
1306                 /*
1307                  * FIXME: we can:
1308                  * 1) ignore the already set proxyAuthz control
1309                  * 2) leave it in place, and don't set ours
1310                  * 3) add both
1311                  * 4) reject the operation
1312                  *
1313                  * option (4) is very drastic
1314                  * option (3) will make the remote server reject
1315                  * the operation, thus being equivalent to (4)
1316                  * option (2) will likely break the idassert
1317                  * assumptions, so we cannot accept it;
1318                  * option (1) means that we are contradicting
1319                  * the client's reques.
1320                  *
1321                  * I think (4) is the only correct choice.
1322                  */
1323                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1324                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1325         }
1326
1327         if ( op->o_is_auth_check ) {
1328                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1329
1330         } else {
1331                 mode = li->li_idassert_mode;
1332         }
1333
1334         switch ( mode ) {
1335         case LDAP_BACK_IDASSERT_LEGACY:
1336         case LDAP_BACK_IDASSERT_SELF:
1337                 /* original behavior:
1338                  * assert the client's identity */
1339                 if ( BER_BVISNULL( &ndn ) ) {
1340                         assertedID = slap_empty_bv;
1341                 } else {
1342                         assertedID = ndn;
1343                 }
1344                 break;
1345
1346         case LDAP_BACK_IDASSERT_ANONYMOUS:
1347                 /* assert "anonymous" */
1348                 assertedID = slap_empty_bv;
1349                 break;
1350
1351         case LDAP_BACK_IDASSERT_NOASSERT:
1352                 /* don't assert; bind as proxyauthzdn */
1353                 goto done;
1354
1355         case LDAP_BACK_IDASSERT_OTHERID:
1356         case LDAP_BACK_IDASSERT_OTHERDN:
1357                 /* assert idassert DN */
1358                 assertedID = li->li_idassert_authzID;
1359                 break;
1360
1361         default:
1362                 assert( 0 );
1363         }
1364
1365         if ( BER_BVISNULL( &assertedID ) ) {
1366                 assertedID = slap_empty_bv;
1367         }
1368
1369         if ( op->o_ctrls ) {
1370                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1371                         /* just count ctrls */ ;
1372         }
1373
1374         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
1375         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
1376
1377         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1378         ctrls[ 0 ]->ldctl_iscritical = 1;
1379
1380         switch ( li->li_idassert_mode ) {
1381         /* already in u:ID or dn:DN form */
1382         case LDAP_BACK_IDASSERT_OTHERID:
1383         case LDAP_BACK_IDASSERT_OTHERDN:
1384                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
1385                 break;
1386
1387         /* needs the dn: prefix */
1388         default:
1389                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1390                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
1391                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1392                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1393                                 assertedID.bv_val, assertedID.bv_len + 1 );
1394                 break;
1395         }
1396
1397         if ( op->o_ctrls ) {
1398                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1399                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1400                 }
1401         }
1402         ctrls[ i + 1 ] = NULL;
1403
1404 done:;
1405         if ( ctrls == NULL ) {
1406                 ctrls = op->o_ctrls;
1407         }
1408
1409         *pctrls = ctrls;
1410
1411         return rs->sr_err;
1412 }
1413
1414 int
1415 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1416 {
1417         LDAPControl     **ctrls = *pctrls;
1418
1419         /* we assume that the first control is the proxyAuthz
1420          * added by back-ldap, so it's the only one we explicitly
1421          * free */
1422         if ( ctrls && ctrls != op->o_ctrls ) {
1423                 assert( ctrls[ 0 ] != NULL );
1424
1425                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1426                         free( ctrls[ 0 ]->ldctl_value.bv_val );
1427                 }
1428
1429                 free( ctrls[ 0 ] );
1430                 free( ctrls );
1431         }
1432
1433         *pctrls = NULL;
1434
1435         return 0;
1436 }