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

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