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 static int
  55 ldap_back_conndnlc_cmp( const void *c1, const void *c2 );
  56
  57 int
  58 ldap_back_bind( Operation *op, SlapReply *rs )
  59 {
  60         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
  61         ldapconn_t      *lc;
  62
  63         int rc = 0;
  64         ber_int_t msgid;
  65
  66         lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR );
  67         if ( !lc ) {
  68                 return rs->sr_err;
  69         }
  70
  71         if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
  72                 ch_free( lc->lc_bound_ndn.bv_val );
  73                 BER_BVZERO( &lc->lc_bound_ndn );
  74         }
  75         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
  76
  77         /* method is always LDAP_AUTH_SIMPLE if we got here */
  78         rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
  79                         LDAP_SASL_SIMPLE,
  80                         &op->orb_cred, op->o_ctrls, NULL, &msgid );
  81         rc = ldap_back_op_result( lc, op, rs, msgid, 0, LDAP_BACK_SENDERR );
  82
  83         if ( rc == LDAP_SUCCESS ) {
  84                 /* If defined, proxyAuthz will be used also when
  85                  * back-ldap is the authorizing backend; for this
  86                  * purpose, a successful bind is followed by a
  87                  * bind with the configured identity assertion */
  88                 /* NOTE: use with care */
  89                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
  90                         ldap_back_proxy_authz_bind( lc, op, rs, LDAP_BACK_SENDERR );
  91                         if ( !LDAP_BACK_CONN_ISBOUND( lc ) ) {
  92                                 rc = 1;
  93                                 goto done;
  94                         }
  95                 }
  96
  97                 LDAP_BACK_CONN_ISBOUND_SET( lc );
  98                 ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
  99
 100                 if ( LDAP_BACK_SAVECRED( li ) ) {
 101                         if ( !BER_BVISNULL( &lc->lc_cred ) ) {
 102                                 memset( lc->lc_cred.bv_val, 0,
 103                                                 lc->lc_cred.bv_len );
 104                         }
 105                         ber_bvreplace( &lc->lc_cred, &op->orb_cred );
 106                         ldap_set_rebind_proc( lc->lc_ld, ldap_back_rebind_f, lc );
 107                 }
 108         }
 109 done:;
 110
 111         assert( lc->lc_binding == 1 );
 112         lc->lc_binding = 0;
 113
 114         /* must re-insert if local DN changed as result of bind */
 115         if ( !LDAP_BACK_CONN_ISBOUND( lc )
 116                 || ( LDAP_BACK_CONN_ISBOUND( lc )
 117                         && !dn_match( &op->o_req_ndn, &lc->lc_local_ndn ) ) )
 118         {
 119                 int             lerr = -1;
 120                 ldapconn_t      *tmplc;
 121
 122                 /* wait for all other ops to release the connection */
 123 retry_lock:;
 124                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 125                 if ( lc->lc_refcnt > 1 ) {
 126                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 127                         ldap_pvt_thread_yield();
 128                         goto retry_lock;
 129                 }
 130
 131                 assert( lc->lc_refcnt == 1 );
 132                 tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 133                                 ldap_back_conndnlc_cmp );
 134                 assert( tmplc == NULL || lc == tmplc );
 135
 136                 if ( LDAP_BACK_CONN_ISBOUND( lc ) ) {
 137                         ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
 138                         lerr = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 139                                 ldap_back_conndn_cmp, ldap_back_conndn_dup );
 140                 }
 141
 142                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 143                 switch ( lerr ) {
 144                 case 0:
 145                         break;
 146
 147                 case -1:
 148                         /* duplicate; someone else successfully bound
 149                          * on the same connection with the same identity;
 150                          * we can do this because lc_refcnt == 1 */
 151                         ldap_back_conn_free( lc );
 152                         lc = NULL;
 153                 }
 154         }
 155
 156         if ( lc != NULL ) {
 157                 ldap_back_release_conn( op, rs, lc );
 158         }
 159
 160         return( rc );
 161 }
 162
 163 /*
 164  * ldap_back_conndn_cmp
 165  *
 166  * compares two ldapconn_t based on the value of the conn pointer
 167  * and of the local DN; used by avl stuff for insert, lookup
 168  * and direct delete
 169  */
 170 int
 171 ldap_back_conndn_cmp( const void *c1, const void *c2 )
 172 {
 173         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 174         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 175         int rc;
 176
 177         /* If local DNs don't match, it is definitely not a match */
 178         /* For shared sessions, conn is NULL. Only explicitly
 179          * bound sessions will have non-NULL conn.
 180          */
 181         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 182         if ( rc == 0 ) {
 183                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 184         }
 185
 186         return rc;
 187 }
 188
 189 /*
 190  * ldap_back_conndnlc_cmp
 191  *
 192  * compares two ldapconn_t based on the value of the conn pointer,
 193  * the local DN and the lc pointer; used by avl stuff for insert, lookup
 194  * and direct delete
 195  */
 196 static int
 197 ldap_back_conndnlc_cmp( const void *c1, const void *c2 )
 198 {
 199         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 200         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 201         int rc;
 202
 203         /* If local DNs don't match, it is definitely not a match */
 204         /* For shared sessions, conn is NULL. Only explicitly
 205          * bound sessions will have non-NULL conn.
 206          */
 207         rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 208         if ( rc == 0 ) {
 209                 rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
 210                 if ( rc == 0 ) {
 211                         rc = SLAP_PTRCMP( lc1, lc2 );
 212                 }
 213         }
 214
 215         return rc;
 216 }
 217
 218 /*
 219  * ldap_back_conn_cmp
 220  *
 221  * compares two ldapconn_t based on the value of the conn pointer;
 222  * used by avl stuff for delete of all conns with the same connid
 223  */
 224 int
 225 ldap_back_conn_cmp( const void *c1, const void *c2 )
 226 {
 227         const ldapconn_t        *lc1 = (const ldapconn_t *)c1;
 228         const ldapconn_t        *lc2 = (const ldapconn_t *)c2;
 229
 230         /* For shared sessions, conn is NULL. Only explicitly
 231          * bound sessions will have non-NULL conn.
 232          */
 233         return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
 234 }
 235
 236 /*
 237  * ldap_back_conndn_dup
 238  *
 239  * returns -1 in case a duplicate ldapconn_t has been inserted;
 240  * used by avl stuff
 241  */
 242 int
 243 ldap_back_conndn_dup( void *c1, void *c2 )
 244 {
 245         ldapconn_t      *lc1 = (ldapconn_t *)c1;
 246         ldapconn_t      *lc2 = (ldapconn_t *)c2;
 247
 248         /* Cannot have more than one shared session with same DN */
 249         if ( lc1->lc_conn == lc2->lc_conn &&
 250                 dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) )
 251         {
 252                 return -1;
 253         }
 254
 255         return 0;
 256 }
 257
 258 #if PRINT_CONNTREE > 0
 259 static void
 260 ravl_print( Avlnode *root, int depth )
 261 {
 262         int             i;
 263         ldapconn_t      *lc;
 264
 265         if ( root == 0 ) {
 266                 return;
 267         }
 268
 269         ravl_print( root->avl_right, depth+1 );
 270
 271         for ( i = 0; i < depth; i++ ) {
 272                 fprintf( stderr, "-" );
 273         }
 274
 275         lc = root->avl_data;
 276         fprintf( stderr, "lc=%p local=\"%s\" conn=%p %s refcnt=%d\n",
 277                 (void *)lc, lc->lc_local_ndn.bv_val, (void *)lc->lc_conn,
 278                 avl_bf2str( root->avl_bf ), lc->lc_refcnt );
 279
 280         ravl_print( root->avl_left, depth+1 );
 281 }
 282
 283 static void
 284 myprint( Avlnode *root )
 285 {
 286         fprintf( stderr, "========>\n" );
 287
 288         if ( root == 0 ) {
 289                 fprintf( stderr, "\tNULL\n" );
 290
 291         } else {
 292                 ravl_print( root, 0 );
 293         }
 294
 295         fprintf( stderr, "<========\n" );
 296 }
 297 #endif /* PRINT_CONNTREE */
 298
 299 int
 300 ldap_back_freeconn( Operation *op, ldapconn_t *lc, int dolock )
 301 {
 302         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
 303         ldapconn_t      *tmplc;
 304
 305         if ( dolock ) {
 306                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 307         }
 308
 309         assert( lc->lc_refcnt >= 0 );
 310         tmplc = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 311                         ldap_back_conndnlc_cmp );
 312         assert( LDAP_BACK_CONN_TAINTED( lc ) || tmplc == lc );
 313         if ( lc->lc_refcnt == 0 ) {
 314                 ldap_back_conn_free( (void *)lc );
 315         }
 316
 317         if ( dolock ) {
 318                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 319         }
 320
 321         return 0;
 322 }
 323
 324 #ifdef HAVE_TLS
 325 static int
 326 ldap_back_start_tls(
 327         LDAP            *ld,
 328         int             protocol,
 329         int             *is_tls,
 330         const char      *url,
 331         unsigned        flags,
 332         int             retries,
 333         const char      **text )
 334 {
 335         int             rc = LDAP_SUCCESS;
 336         ldapinfo_t      dummy;
 337
 338         /* this is ridiculous... */
 339         dummy.li_flags = flags;
 340
 341         /* start TLS ("tls-[try-]{start,propagate}" statements) */
 342         if ( ( LDAP_BACK_USE_TLS( &dummy ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &dummy ) ) )
 343                                 && !ldap_is_ldaps_url( url ) )
 344         {
 345 #ifdef SLAP_STARTTLS_ASYNCHRONOUS
 346                 /*
 347                  * use asynchronous StartTLS
 348                  * in case, chase referral (not implemented yet)
 349                  */
 350                 int             msgid;
 351
 352                 if ( protocol == 0 ) {
 353                         ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 354                                         (void *)&protocol );
 355                 }
 356
 357                 if ( protocol < LDAP_VERSION3 ) {
 358                         protocol = LDAP_VERSION3;
 359                         /* Set LDAP version */
 360                         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION,
 361                                         (const void *)&protocol );
 362                 }
 363
 364                 rc = ldap_start_tls( ld, NULL, NULL, &msgid );
 365                 if ( rc == LDAP_SUCCESS ) {
 366                         LDAPMessage     *res = NULL;
 367                         struct timeval  tv;
 368
 369                         LDAP_BACK_TV_SET( &tv );
 370
 371 retry:;
 372                         rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
 373                         if ( rc < 0 ) {
 374                                 rc = LDAP_UNAVAILABLE;
 375
 376                         } else if ( rc == 0 ) {
 377                                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 378                                         ldap_pvt_thread_yield();
 379                                         if ( retries > 0 ) {
 380                                                 retries--;
 381                                         }
 382                                         LDAP_BACK_TV_SET( &tv );
 383                                         goto retry;
 384                                 }
 385                                 rc = LDAP_UNAVAILABLE;
 386
 387                         } else if ( rc == LDAP_RES_EXTENDED ) {
 388                                 struct berval   *data = NULL;
 389
 390                                 rc = ldap_parse_extended_result( ld, res,
 391                                                 NULL, &data, 0 );
 392                                 if ( rc == LDAP_SUCCESS ) {
 393                                         int err;
 394                                         rc = ldap_parse_result( ld, res, &err,
 395                                                 NULL, NULL, NULL, NULL, 1 );
 396                                         if ( rc == LDAP_SUCCESS ) {
 397                                                 rc = err;
 398                                         }
 399                                         res = NULL;
 400
 401                                         /* FIXME: in case a referral
 402                                          * is returned, should we try
 403                                          * using it instead of the
 404                                          * configured URI? */
 405                                         if ( rc == LDAP_SUCCESS ) {
 406                                                 rc = ldap_install_tls( ld );
 407
 408                                         } else if ( rc == LDAP_REFERRAL ) {
 409                                                 rc = LDAP_UNWILLING_TO_PERFORM;
 410                                                 *text = "unwilling to chase referral returned by Start TLS exop";
 411                                         }
 412
 413                                         if ( data ) {
 414                                                 if ( data->bv_val ) {
 415                                                         ber_memfree( data->bv_val );
 416                                                 }
 417                                                 ber_memfree( data );
 418                                         }
 419                                 }
 420
 421                         } else {
 422                                 rc = LDAP_OTHER;
 423                         }
 424
 425                         if ( res != NULL ) {
 426                                 ldap_msgfree( res );
 427                         }
 428                 }
 429 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 430                 /*
 431                  * use synchronous StartTLS
 432                  */
 433                 rc = ldap_start_tls_s( ld, NULL, NULL );
 434 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
 435
 436                 /* if StartTLS is requested, only attempt it if the URL
 437                  * is not "ldaps://"; this may occur not only in case
 438                  * of misconfiguration, but also when used in the chain
 439                  * overlay, where the "uri" can be parsed out of a referral */
 440                 switch ( rc ) {
 441                 case LDAP_SUCCESS:
 442                         *is_tls = 1;
 443                         break;
 444
 445                 case LDAP_SERVER_DOWN:
 446                         break;
 447
 448                 default:
 449                         if ( LDAP_BACK_TLS_CRITICAL( &dummy ) ) {
 450                                 *text = "could not start TLS";
 451                                 break;
 452                         }
 453
 454                         /* in case Start TLS is not critical */
 455                         *is_tls = 0;
 456                         rc = LDAP_SUCCESS;
 457                         break;
 458                 }
 459
 460         } else {
 461                 *is_tls = 0;
 462         }
 463
 464         return rc;
 465 }
 466 #endif /* HAVE_TLS */
 467
 468 static int
 469 ldap_back_prepare_conn( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 470 {
 471         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 472         int             vers = op->o_protocol;
 473         LDAP            *ld = NULL;
 474 #ifdef HAVE_TLS
 475         int             is_tls = op->o_conn->c_is_tls;
 476 #endif /* HAVE_TLS */
 477
 478         assert( lcp != NULL );
 479
 480         rs->sr_err = ldap_initialize( &ld, li->li_uri );
 481         if ( rs->sr_err != LDAP_SUCCESS ) {
 482                 goto error_return;
 483         }
 484
 485         /* Set LDAP version. This will always succeed: If the client
 486          * bound with a particular version, then so can we.
 487          */
 488         if ( vers == 0 ) {
 489                 /* assume it's an internal op; set to LDAPv3 */
 490                 vers = LDAP_VERSION3;
 491         }
 492         ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&vers );
 493
 494         /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
 495         ldap_set_option( ld, LDAP_OPT_REFERRALS,
 496                 LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 497
 498         if ( li->li_network_timeout > 0 ) {
 499                 struct timeval          tv;
 500
 501                 tv.tv_sec = li->li_network_timeout;
 502                 tv.tv_usec = 0;
 503                 ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
 504         }
 505
 506 #ifdef HAVE_TLS
 507         rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
 508                         li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
 509         if ( rs->sr_err != LDAP_SUCCESS ) {
 510                 ldap_unbind_ext( ld, NULL, NULL );
 511                 goto error_return;
 512         }
 513 #endif /* HAVE_TLS */
 514
 515         if ( *lcp == NULL ) {
 516                 *lcp = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
 517                 (*lcp)->lc_flags= li->li_flags;
 518         }
 519         (*lcp)->lc_ld = ld;
 520         (*lcp)->lc_refcnt = 1;
 521         (*lcp)->lc_binding = 1;
 522 #ifdef HAVE_TLS
 523         if ( is_tls ) {
 524                 LDAP_BACK_CONN_ISTLS_SET( *lcp );
 525         } else {
 526                 LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
 527         }
 528 #endif /* HAVE_TLS */
 529
 530 error_return:;
 531         if ( rs->sr_err != LDAP_SUCCESS ) {
 532                 rs->sr_err = slap_map_api2result( rs );
 533                 if ( sendok & LDAP_BACK_SENDERR ) {
 534                         if ( rs->sr_text == NULL ) {
 535                                 rs->sr_text = "ldap_initialize() failed";
 536                         }
 537                         send_ldap_result( op, rs );
 538                         rs->sr_text = NULL;
 539                 }
 540
 541         } else {
 542                 if ( li->li_conn_ttl > 0 ) {
 543                         (*lcp)->lc_create_time = op->o_time;
 544                 }
 545         }
 546
 547         return rs->sr_err;
 548 }
 549
 550 ldapconn_t *
 551 ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 552 {
 553         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 554         ldapconn_t      *lc = NULL,
 555                         lc_curr = { 0 };
 556         int             refcnt = 1, binding = 1;
 557
 558         /* Internal searches are privileged and shared. So is root. */
 559         if ( op->o_do_not_cache || be_isroot( op ) ) {
 560                 LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
 561                 lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
 562                 lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 563
 564         } else {
 565                 lc_curr.lc_local_ndn = op->o_ndn;
 566                 /* Explicit binds must not be shared */
 567                 if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
 568                         lc_curr.lc_conn = op->o_conn;
 569
 570                 } else {
 571                         lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
 572                 }
 573         }
 574
 575         /* Explicit Bind requests always get their own conn */
 576         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 577                 /* Searches for a ldapconn in the avl tree */
 578 retry_lock:
 579                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 580
 581                 lc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 582                                 (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 583                 if ( lc != NULL ) {
 584                         /* Don't reuse connections while they're still binding */
 585                         if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 586                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 587                                 ldap_pvt_thread_yield();
 588                                 goto retry_lock;
 589                         }
 590                         refcnt = ++lc->lc_refcnt;
 591                         binding = ++lc->lc_binding;
 592                 }
 593                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 594         }
 595
 596         /* Looks like we didn't get a bind. Open a new session... */
 597         if ( lc == NULL ) {
 598                 if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
 599                         return NULL;
 600                 }
 601                 if ( sendok & LDAP_BACK_BINDING ) {
 602                         LDAP_BACK_CONN_BINDING_SET( lc );
 603                 }
 604                 lc->lc_conn = lc_curr.lc_conn;
 605                 ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
 606
 607                 if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
 608                         ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
 609                         ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
 610                         LDAP_BACK_CONN_ISPRIV_SET( lc );
 611
 612                 } else {
 613                         BER_BVZERO( &lc->lc_cred );
 614                         BER_BVZERO( &lc->lc_bound_ndn );
 615 #if 0
 616                         /* FIXME: if we set lc_bound_ndn = o_ndn
 617                          * we end up with a bind with DN but no password! */
 618                         if ( !BER_BVISEMPTY( &op->o_ndn )
 619                                 && SLAP_IS_AUTHZ_BACKEND( op ) )
 620                         {
 621                                 ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
 622                         }
 623 #endif
 624                 }
 625
 626 #ifdef HAVE_TLS
 627                 /* if start TLS failed but it was not mandatory,
 628                  * check if the non-TLS connection was already
 629                  * in cache; in case, destroy the newly created
 630                  * connection and use the existing one */
 631                 if ( lc->lc_conn == LDAP_BACK_PCONN_TLS
 632                                 && !ldap_tls_inplace( lc->lc_ld ) )
 633                 {
 634                         ldapconn_t *tmplc;
 635
 636                         lc_curr.lc_conn = LDAP_BACK_PCONN;
 637                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 638                         tmplc = (ldapconn_t *)avl_find( li->li_conninfo.lai_tree,
 639                                         (caddr_t)&lc_curr, ldap_back_conndn_cmp );
 640                         if ( tmplc != NULL ) {
 641                                 refcnt = ++tmplc->lc_refcnt;
 642                                 binding = ++tmplc->lc_binding;
 643                                 ldap_back_conn_free( lc );
 644                                 lc = tmplc;
 645                         }
 646                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 647
 648                         if ( tmplc != NULL ) {
 649                                 goto done;
 650                         }
 651                 }
 652 #endif /* HAVE_TLS */
 653
 654                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 655
 656                 /* Inserts the newly created ldapconn in the avl tree */
 657                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 658
 659                 assert( lc->lc_refcnt == 1 );
 660                 assert( lc->lc_binding == 1 );
 661                 rs->sr_err = avl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
 662                         ldap_back_conndn_cmp, ldap_back_conndn_dup );
 663
 664 #if PRINT_CONNTREE > 0
 665                 myprint( li->li_conninfo.lai_tree );
 666 #endif /* PRINT_CONNTREE */
 667
 668                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 669
 670                 Debug( LDAP_DEBUG_TRACE,
 671                         "=>ldap_back_getconn: conn %p inserted refcnt=%u binding=%u\n",
 672                         (void *)lc, refcnt, binding );
 673
 674                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 675                 switch ( rs->sr_err ) {
 676                 case 0:
 677                         break;
 678
 679                 case -1:
 680                         if ( !( sendok & LDAP_BACK_BINDING ) ) {
 681                                 /* duplicate: free and try to get the newly created one */
 682                                 goto retry_lock;
 683                         }
 684                         /* taint connection, so that it'll be freed when released */
 685                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 686                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 687                                         ldap_back_conndnlc_cmp );
 688                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 689                         LDAP_BACK_CONN_TAINTED_SET( lc );
 690                         break;
 691
 692                 default:
 693                         ldap_back_conn_free( lc );
 694                         rs->sr_err = LDAP_OTHER;
 695                         rs->sr_text = "proxy bind collision";
 696                         if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
 697                                 send_ldap_result( op, rs );
 698                                 rs->sr_text = NULL;
 699                         }
 700                         return NULL;
 701                 }
 702
 703         } else {
 704                 char    buf[ SLAP_TEXT_BUFLEN ];
 705                 int     expiring = 0;
 706
 707                 if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
 708                         || ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
 709                 {
 710                         expiring = 1;
 711
 712                         /* let it be used, but taint/delete it so that
 713                          * no-one else can look it up any further */
 714                         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 715                         (void *)avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
 716                                         ldap_back_conndnlc_cmp );
 717                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 718                         LDAP_BACK_CONN_TAINTED_SET( lc );
 719                 }
 720
 721                 if ( LogTest( LDAP_DEBUG_TRACE ) ) {
 722                         snprintf( buf, sizeof( buf ),
 723                                 "conn %p fetched refcnt=%u binding=%u%s",
 724                                 (void *)lc, refcnt, binding, expiring ? " expiring" : "" );
 725                         Debug( LDAP_DEBUG_TRACE,
 726                                 "=>ldap_back_getconn: %s.\n", buf, 0, 0 );
 727                 }
 728         }
 729
 730         if ( li->li_idle_timeout && lc ) {
 731                 lc->lc_time = op->o_time;
 732         }
 733
 734 done:;
 735         return lc;
 736 }
 737
 738 void
 739 ldap_back_release_conn_lock(
 740         Operation               *op,
 741         SlapReply               *rs,
 742         ldapconn_t              *lc,
 743         int                     dolock )
 744 {
 745         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 746
 747         if ( dolock ) {
 748                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 749         }
 750         assert( lc->lc_refcnt > 0 );
 751         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 752         lc->lc_refcnt--;
 753         if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
 754                 ldap_back_freeconn( op, lc, 0 );
 755         }
 756         if ( dolock ) {
 757                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 758         }
 759 }
 760
 761 /*
 762  * ldap_back_dobind
 763  *
 764  * Note: as the check for the value of lc->lc_bound was already here, I removed
 765  * it from all the callers, and I made the function return the flag, so
 766  * it can be used to simplify the check.
 767  *
 768  * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
 769  */
 770 static int
 771 ldap_back_dobind_int(
 772         ldapconn_t              *lc,
 773         Operation               *op,
 774         SlapReply               *rs,
 775         ldap_back_send_t        sendok,
 776         int                     retries,
 777         int                     dolock )
 778 {
 779         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 780
 781         int             rc, binding = 0;
 782         ber_int_t       msgid;
 783
 784         assert( retries >= 0 );
 785
 786 retry_lock:;
 787         if ( dolock ) {
 788                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 789         }
 790
 791         if ( binding == 0 ) {
 792                 /* check if already bound */
 793                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 794                 if ( rc ) {
 795                         lc->lc_binding--;
 796                         if ( dolock ) {
 797                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 798                         }
 799                         return rc;
 800                 }
 801
 802                 if ( LDAP_BACK_CONN_BINDING( lc ) ) {
 803                         /* if someone else is about to bind it, give up and retry */
 804                         if ( dolock ) {
 805                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 806                         }
 807                         ldap_pvt_thread_yield();
 808                         goto retry_lock;
 809
 810                 } else {
 811                         /* otherwise this thread will bind it */
 812                         LDAP_BACK_CONN_BINDING_SET( lc );
 813                         binding = 1;
 814                 }
 815         }
 816
 817         /* wait for pending operations to finish */
 818         /* FIXME: may become a bottleneck! */
 819         if ( lc->lc_refcnt != lc->lc_binding ) {
 820                 if ( dolock ) {
 821                         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 822                 }
 823                 ldap_pvt_thread_yield();
 824                 goto retry_lock;
 825         }
 826
 827         if ( dolock ) {
 828                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 829         }
 830
 831 #if 0
 832         while ( lc->lc_refcnt > 1 ) {
 833                 ldap_pvt_thread_yield();
 834                 rc = LDAP_BACK_CONN_ISBOUND( lc );
 835                 if ( rc ) {
 836                         return rc;
 837                 }
 838         }
 839
 840         if ( dolock ) {
 841                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 842         }
 843         LDAP_BACK_CONN_BINDING_SET( lc );
 844         if ( dolock ) {
 845                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 846         }
 847 #endif
 848
 849         /*
 850          * FIXME: we need to let clients use proxyAuthz
 851          * otherwise we cannot do symmetric pools of servers;
 852          * we have to live with the fact that a user can
 853          * authorize itself as any ID that is allowed
 854          * by the authzTo directive of the "proxyauthzdn".
 855          */
 856         /*
 857          * NOTE: current Proxy Authorization specification
 858          * and implementation do not allow proxy authorization
 859          * control to be provided with Bind requests
 860          */
 861         /*
 862          * if no bind took place yet, but the connection is bound
 863          * and the "idassert-authcDN" (or other ID) is set,
 864          * then bind as the asserting identity and explicitly
 865          * add the proxyAuthz control to every operation with the
 866          * dn bound to the connection as control value.
 867          * This is done also if this is the authrizing backend,
 868          * but the "override" flag is given to idassert.
 869          * It allows to use SASL bind and yet proxyAuthz users
 870          */
 871         if ( op->o_conn != NULL &&
 872                         !op->o_do_not_cache &&
 873                         ( BER_BVISNULL( &lc->lc_bound_ndn ) ||
 874                           ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
 875         {
 876                 (void)ldap_back_proxy_authz_bind( lc, op, rs, sendok );
 877                 goto done;
 878         }
 879
 880 #ifdef HAVE_CYRUS_SASL
 881         if ( LDAP_BACK_CONN_ISPRIV( lc )
 882                 && li->li_acl_authmethod == LDAP_AUTH_SASL )
 883         {
 884                 void            *defaults = NULL;
 885
 886                 if ( li->li_acl_secprops != NULL ) {
 887                         rc = ldap_set_option( lc->lc_ld,
 888                                 LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops);
 889
 890                         if ( rc != LDAP_OPT_SUCCESS ) {
 891                                 Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
 892                                         "(%s,SECPROPS,\"%s\") failed!\n",
 893                                         li->li_uri, li->li_acl_secprops, 0 );
 894                                 goto done;
 895                         }
 896                 }
 897
 898                 defaults = lutil_sasl_defaults( lc->lc_ld,
 899                                 li->li_acl_sasl_mech.bv_val,
 900                                 li->li_acl_sasl_realm.bv_val,
 901                                 li->li_acl_authcID.bv_val,
 902                                 li->li_acl_passwd.bv_val,
 903                                 NULL );
 904
 905                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
 906                                 li->li_acl_authcDN.bv_val,
 907                                 li->li_acl_sasl_mech.bv_val, NULL, NULL,
 908                                 LDAP_SASL_QUIET, lutil_sasl_interact,
 909                                 defaults );
 910
 911                 lutil_sasl_freedefs( defaults );
 912
 913                 rs->sr_err = slap_map_api2result( rs );
 914                 if ( rs->sr_err != LDAP_SUCCESS ) {
 915                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
 916                         send_ldap_result( op, rs );
 917
 918                 } else {
 919                         LDAP_BACK_CONN_ISBOUND_SET( lc );
 920                 }
 921                 goto done;
 922         }
 923 #endif /* HAVE_CYRUS_SASL */
 924
 925 retry:;
 926         rs->sr_err = ldap_sasl_bind( lc->lc_ld,
 927                         lc->lc_bound_ndn.bv_val,
 928                         LDAP_SASL_SIMPLE, &lc->lc_cred,
 929                         NULL, NULL, &msgid );
 930
 931         if ( rs->sr_err == LDAP_SERVER_DOWN ) {
 932                 if ( retries != LDAP_BACK_RETRY_NEVER ) {
 933                         if ( dolock ) {
 934                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 935                         }
 936
 937                         assert( lc->lc_refcnt > 0 );
 938                         if ( lc->lc_refcnt == 1 ) {
 939                                 ldap_unbind_ext( lc->lc_ld, NULL, NULL );
 940                                 lc->lc_ld = NULL;
 941
 942                                 /* lc here must be the regular lc, reset and ready for init */
 943                                 rs->sr_err = ldap_back_prepare_conn( &lc, op, rs, sendok );
 944                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 945                                         lc->lc_binding--;
 946                                         lc->lc_refcnt = 0;
 947                                 }
 948                         }
 949
 950                         if ( dolock ) {
 951                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 952                         }
 953
 954                         if ( rs->sr_err == LDAP_SUCCESS ) {
 955                                 if ( retries > 0 ) {
 956                                         retries--;
 957                                 }
 958                                 goto retry;
 959                         }
 960
 961                 } else {
 962                         if ( dolock ) {
 963                                 ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
 964                         }
 965                         lc->lc_binding--;
 966                         if ( dolock ) {
 967                                 ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
 968                         }
 969                 }
 970
 971                 ldap_back_freeconn( op, lc, dolock );
 972                 rs->sr_err = slap_map_api2result( rs );
 973
 974                 return 0;
 975         }
 976
 977         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
 978         if ( rc == LDAP_SUCCESS ) {
 979                 LDAP_BACK_CONN_ISBOUND_SET( lc );
 980         }
 981
 982 done:;
 983         lc->lc_binding--;
 984         LDAP_BACK_CONN_BINDING_CLEAR( lc );
 985         rc = LDAP_BACK_CONN_ISBOUND( lc );
 986         if ( !rc ) {
 987                 ldap_back_release_conn_lock( op, rs, lc, dolock );
 988         }
 989
 990         return rc;
 991 }
 992
 993 int
 994 ldap_back_dobind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
 995 {
 996         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
 997
 998         return ldap_back_dobind_int( lc, op, rs, sendok, li->li_nretries, 1 );
 999 }
1000
1001 /*
1002  * ldap_back_default_rebind
1003  *
1004  * This is a callback used for chasing referrals using the same
1005  * credentials as the original user on this session.
1006  */
1007 static int
1008 ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
1009         ber_int_t msgid, void *params )
1010 {
1011         ldapconn_t      *lc = (ldapconn_t *)params;
1012
1013 #ifdef HAVE_TLS
1014         /* ... otherwise we couldn't get here */
1015         assert( lc != NULL );
1016
1017         if ( !ldap_tls_inplace( ld ) ) {
1018                 int             is_tls = LDAP_BACK_CONN_ISTLS( lc ),
1019                                 rc;
1020                 const char      *text = NULL;
1021
1022                 rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
1023                         LDAP_BACK_RETRY_DEFAULT, &text );
1024                 if ( rc != LDAP_SUCCESS ) {
1025                         return rc;
1026                 }
1027         }
1028 #endif /* HAVE_TLS */
1029
1030         /* FIXME: add checks on the URL/identity? */
1031
1032         return ldap_sasl_bind_s( ld, lc->lc_bound_ndn.bv_val,
1033                         LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
1034 }
1035
1036 int
1037 ldap_back_op_result(
1038                 ldapconn_t              *lc,
1039                 Operation               *op,
1040                 SlapReply               *rs,
1041                 ber_int_t               msgid,
1042                 time_t                  timeout,
1043                 ldap_back_send_t        sendok )
1044 {
1045         char            *match = NULL;
1046         LDAPMessage     *res = NULL;
1047         char            *text = NULL;
1048
1049 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
1050
1051         rs->sr_text = NULL;
1052         rs->sr_matched = NULL;
1053
1054         /* if the error recorded in the reply corresponds
1055          * to a successful state, get the error from the
1056          * remote server response */
1057         if ( ERR_OK( rs->sr_err ) ) {
1058                 int             rc;
1059                 struct timeval  tv;
1060
1061                 if ( timeout ) {
1062                         tv.tv_sec = timeout;
1063                         tv.tv_usec = 0;
1064
1065                 } else {
1066                         LDAP_BACK_TV_SET( &tv );
1067                 }
1068
1069 retry:;
1070                 /* if result parsing fails, note the failure reason */
1071                 rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
1072                 switch ( rc ) {
1073                 case 0:
1074                         if ( timeout ) {
1075                                 (void)ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
1076                                 rs->sr_err = op->o_protocol >= LDAP_VERSION3 ?
1077                                         LDAP_ADMINLIMIT_EXCEEDED : LDAP_OPERATIONS_ERROR;
1078                                 rs->sr_text = "Operation timed out";
1079                                 break;
1080                         }
1081
1082                         LDAP_BACK_TV_SET( &tv );
1083                         ldap_pvt_thread_yield();
1084                         goto retry;
1085
1086                 case -1:
1087                         ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
1088                                         &rs->sr_err );
1089                         break;
1090
1091
1092                 /* otherwise get the result; if it is not
1093                  * LDAP_SUCCESS, record it in the reply
1094                  * structure (this includes
1095                  * LDAP_COMPARE_{TRUE|FALSE}) */
1096                 default:
1097                         rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
1098                                         &match, &text, NULL, NULL, 1 );
1099                         rs->sr_text = text;
1100                         if ( rc != LDAP_SUCCESS ) {
1101                                 rs->sr_err = rc;
1102                         }
1103                 }
1104         }
1105
1106         /* if the error in the reply structure is not
1107          * LDAP_SUCCESS, try to map it from client
1108          * to server error */
1109         if ( !ERR_OK( rs->sr_err ) ) {
1110                 rs->sr_err = slap_map_api2result( rs );
1111
1112                 /* internal ops ( op->o_conn == NULL )
1113                  * must not reply to client */
1114                 if ( op->o_conn && !op->o_do_not_cache && match ) {
1115
1116                         /* record the (massaged) matched
1117                          * DN into the reply structure */
1118                         rs->sr_matched = match;
1119                 }
1120         }
1121         if ( op->o_conn &&
1122                         ( ( sendok & LDAP_BACK_SENDOK )
1123                           || ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
1124         {
1125                 send_ldap_result( op, rs );
1126         }
1127         if ( match ) {
1128                 if ( rs->sr_matched != match ) {
1129                         free( (char *)rs->sr_matched );
1130                 }
1131                 rs->sr_matched = NULL;
1132                 ldap_memfree( match );
1133         }
1134         if ( text ) {
1135                 ldap_memfree( text );
1136         }
1137         rs->sr_text = NULL;
1138         return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
1139 }
1140
1141 /* return true if bound, false if failed */
1142 int
1143 ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1144 {
1145         int             rc = 0;
1146         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1147
1148         assert( lcp != NULL );
1149         assert( *lcp != NULL );
1150
1151         ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
1152
1153         if ( (*lcp)->lc_refcnt == 1 ) {
1154                 Debug( LDAP_DEBUG_ANY,
1155                         "%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
1156                         op->o_log_prefix, li->li_uri,
1157                         BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
1158                                 "" : (*lcp)->lc_bound_ndn.bv_val );
1159
1160                 ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
1161                 (*lcp)->lc_ld = NULL;
1162                 LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
1163
1164                 /* lc here must be the regular lc, reset and ready for init */
1165                 rc = ldap_back_prepare_conn( lcp, op, rs, sendok );
1166                 if ( rc != LDAP_SUCCESS ) {
1167                         rc = 0;
1168                         *lcp = NULL;
1169
1170                 } else {
1171                         rc = ldap_back_dobind_int( *lcp, op, rs, sendok, 0, 0 );
1172                         if ( rc == 0 ) {
1173                                 *lcp = NULL;
1174                         }
1175                 }
1176
1177         } else {
1178                 Debug( LDAP_DEBUG_TRACE,
1179                         "ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
1180                         (void *)(*lcp), (*lcp)->lc_refcnt, 0 );
1181
1182                 ldap_back_release_conn_lock( op, rs, *lcp, 0 );
1183                 *lcp = NULL;
1184
1185                 if ( sendok ) {
1186                         rs->sr_err = LDAP_UNAVAILABLE;
1187                         rs->sr_text = "unable to retry";
1188                         send_ldap_result( op, rs );
1189                 }
1190         }
1191
1192         ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
1193
1194         return rc;
1195 }
1196
1197 static int
1198 ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
1199 {
1200         ldapinfo_t      *li = (ldapinfo_t *)op->o_bd->be_private;
1201         struct berval   binddn = slap_empty_bv;
1202         struct berval   bindcred = slap_empty_bv;
1203         struct berval   ndn;
1204         int             dobind = 0;
1205         int             msgid;
1206         int             rc;
1207
1208         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1209                 ndn = op->o_conn->c_ndn;
1210
1211         } else {
1212                 ndn = op->o_ndn;
1213         }
1214
1215         /*
1216          * FIXME: we need to let clients use proxyAuthz
1217          * otherwise we cannot do symmetric pools of servers;
1218          * we have to live with the fact that a user can
1219          * authorize itself as any ID that is allowed
1220          * by the authzTo directive of the "proxyauthzdn".
1221          */
1222         /*
1223          * NOTE: current Proxy Authorization specification
1224          * and implementation do not allow proxy authorization
1225          * control to be provided with Bind requests
1226          */
1227         /*
1228          * if no bind took place yet, but the connection is bound
1229          * and the "proxyauthzdn" is set, then bind as
1230          * "proxyauthzdn" and explicitly add the proxyAuthz
1231          * control to every operation with the dn bound
1232          * to the connection as control value.
1233          */
1234
1235         /* bind as proxyauthzdn only if no idassert mode
1236          * is requested, or if the client's identity
1237          * is authorized */
1238         switch ( li->li_idassert_mode ) {
1239         case LDAP_BACK_IDASSERT_LEGACY:
1240                 if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
1241                         if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
1242                         {
1243                                 binddn = li->li_idassert_authcDN;
1244                                 bindcred = li->li_idassert_passwd;
1245                                 dobind = 1;
1246                         }
1247                 }
1248                 break;
1249
1250         default:
1251                 /* NOTE: rootdn can always idassert */
1252                 if ( BER_BVISNULL( &ndn ) && li->li_idassert_authz == NULL ) {
1253                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1254                                 rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
1255                                 if ( sendok & LDAP_BACK_SENDERR ) {
1256                                         send_ldap_result( op, rs );
1257                                 }
1258                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1259
1260                         } else {
1261                                 rs->sr_err = LDAP_SUCCESS;
1262                                 binddn = slap_empty_bv;
1263                                 bindcred = slap_empty_bv;
1264                                 break;
1265                         }
1266
1267                         goto done;
1268
1269                 } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1270                         struct berval authcDN;
1271
1272                         if ( BER_BVISNULL( &ndn ) ) {
1273                                 authcDN = slap_empty_bv;
1274
1275                         } else {
1276                                 authcDN = ndn;
1277                         }
1278                         rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
1279                                         &authcDN, &authcDN );
1280                         if ( rs->sr_err != LDAP_SUCCESS ) {
1281                                 if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
1282                                         if ( sendok & LDAP_BACK_SENDERR ) {
1283                                                 send_ldap_result( op, rs );
1284                                         }
1285                                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1286
1287                                 } else {
1288                                         rs->sr_err = LDAP_SUCCESS;
1289                                         binddn = slap_empty_bv;
1290                                         bindcred = slap_empty_bv;
1291                                         break;
1292                                 }
1293
1294                                 goto done;
1295                         }
1296                 }
1297
1298                 binddn = li->li_idassert_authcDN;
1299                 bindcred = li->li_idassert_passwd;
1300                 dobind = 1;
1301                 break;
1302         }
1303
1304         if ( dobind && li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1305 #ifdef HAVE_CYRUS_SASL
1306                 void            *defaults = NULL;
1307                 struct berval   authzID = BER_BVNULL;
1308                 int             freeauthz = 0;
1309
1310                 /* if SASL supports native authz, prepare for it */
1311                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
1312                                 ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
1313                 {
1314                         switch ( li->li_idassert_mode ) {
1315                         case LDAP_BACK_IDASSERT_OTHERID:
1316                         case LDAP_BACK_IDASSERT_OTHERDN:
1317                                 authzID = li->li_idassert_authzID;
1318                                 break;
1319
1320                         case LDAP_BACK_IDASSERT_ANONYMOUS:
1321                                 BER_BVSTR( &authzID, "dn:" );
1322                                 break;
1323
1324                         case LDAP_BACK_IDASSERT_SELF:
1325                                 if ( BER_BVISNULL( &ndn ) ) {
1326                                         /* connection is not authc'd, so don't idassert */
1327                                         BER_BVSTR( &authzID, "dn:" );
1328                                         break;
1329                                 }
1330                                 authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
1331                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
1332                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
1333                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
1334                                                 ndn.bv_val, ndn.bv_len + 1 );
1335                                 freeauthz = 1;
1336                                 break;
1337
1338                         default:
1339                                 break;
1340                         }
1341                 }
1342
1343                 if ( li->li_idassert_secprops != NULL ) {
1344                         rs->sr_err = ldap_set_option( lc->lc_ld,
1345                                 LDAP_OPT_X_SASL_SECPROPS,
1346                                 (void *)li->li_idassert_secprops );
1347
1348                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
1349                                 rs->sr_err = LDAP_OTHER;
1350                                 if ( sendok & LDAP_BACK_SENDERR ) {
1351                                         send_ldap_result( op, rs );
1352                                 }
1353                                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1354                                 goto done;
1355                         }
1356                 }
1357
1358                 defaults = lutil_sasl_defaults( lc->lc_ld,
1359                                 li->li_idassert_sasl_mech.bv_val,
1360                                 li->li_idassert_sasl_realm.bv_val,
1361                                 li->li_idassert_authcID.bv_val,
1362                                 li->li_idassert_passwd.bv_val,
1363                                 authzID.bv_val );
1364
1365                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
1366                                 li->li_idassert_sasl_mech.bv_val, NULL, NULL,
1367                                 LDAP_SASL_QUIET, lutil_sasl_interact,
1368                                 defaults );
1369
1370                 rs->sr_err = slap_map_api2result( rs );
1371                 if ( rs->sr_err != LDAP_SUCCESS ) {
1372                         LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1373                         if ( sendok & LDAP_BACK_SENDERR ) {
1374                                 send_ldap_result( op, rs );
1375                         }
1376
1377                 } else {
1378                         LDAP_BACK_CONN_ISBOUND_SET( lc );
1379                 }
1380
1381                 lutil_sasl_freedefs( defaults );
1382                 if ( freeauthz ) {
1383                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
1384                 }
1385
1386                 goto done;
1387 #endif /* HAVE_CYRUS_SASL */
1388         }
1389
1390         switch ( li->li_idassert_authmethod ) {
1391         case LDAP_AUTH_NONE:
1392                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1393                 goto done;
1394
1395         case LDAP_AUTH_SIMPLE:
1396                 rs->sr_err = ldap_sasl_bind( lc->lc_ld,
1397                                 binddn.bv_val, LDAP_SASL_SIMPLE,
1398                                 &bindcred, NULL, NULL, &msgid );
1399                 break;
1400
1401         default:
1402                 /* unsupported! */
1403                 LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
1404                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
1405                 if ( sendok & LDAP_BACK_SENDERR ) {
1406                         send_ldap_result( op, rs );
1407                 }
1408                 goto done;
1409         }
1410
1411         rc = ldap_back_op_result( lc, op, rs, msgid, 0, sendok );
1412         if ( rc == LDAP_SUCCESS ) {
1413                 LDAP_BACK_CONN_ISBOUND_SET( lc );
1414         }
1415 done:;
1416         return LDAP_BACK_CONN_ISBOUND( lc );
1417 }
1418
1419 /*
1420  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
1421  * to existing server-side controls if required; if not,
1422  * the existing server-side controls are placed in *pctrls.
1423  * The caller, after using the controls in client API
1424  * operations, if ( *pctrls != op->o_ctrls ), should
1425  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
1426  * The function returns success if the control could
1427  * be added if required, or if it did nothing; in the future,
1428  * it might return some error if it failed.
1429  *
1430  * if no bind took place yet, but the connection is bound
1431  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
1432  * and explicitly add proxyAuthz the control to every operation
1433  * with the dn bound to the connection as control value.
1434  *
1435  * If no server-side controls are defined for the operation,
1436  * simply add the proxyAuthz control; otherwise, if the
1437  * proxyAuthz control is not already set, add it as
1438  * the first one
1439  *
1440  * FIXME: is controls order significant for security?
1441  * ANSWER: controls ordering and interoperability
1442  * must be indicated by the specs of each control; if none
1443  * is specified, the order is irrelevant.
1444  */
1445 int
1446 ldap_back_proxy_authz_ctrl(
1447                 ldapconn_t      *lc,
1448                 Operation       *op,
1449                 SlapReply       *rs,
1450                 LDAPControl     ***pctrls )
1451 {
1452         ldapinfo_t      *li = (ldapinfo_t *) op->o_bd->be_private;
1453         LDAPControl     **ctrls = NULL;
1454         int             i = 0,
1455                         mode;
1456         struct berval   assertedID,
1457                         ndn;
1458
1459         *pctrls = NULL;
1460
1461         rs->sr_err = LDAP_SUCCESS;
1462
1463         /* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
1464          * but if it is not set this test fails.  We need a different
1465          * means to detect if idassert is enabled */
1466         if ( ( BER_BVISNULL( &li->li_idassert_authcID ) || BER_BVISEMPTY( &li->li_idassert_authcID ) )
1467                         && ( BER_BVISNULL( &li->li_idassert_authcDN ) || BER_BVISEMPTY( &li->li_idassert_authcDN ) ) )
1468         {
1469                 goto done;
1470         }
1471
1472         if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
1473                 goto done;
1474         }
1475
1476         if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
1477                 ndn = op->o_conn->c_ndn;
1478
1479         } else {
1480                 ndn = op->o_ndn;
1481         }
1482
1483         if ( li->li_idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
1484                 if ( op->o_proxy_authz ) {
1485                         /*
1486                          * FIXME: we do not want to perform proxyAuthz
1487                          * on behalf of the client, because this would
1488                          * be performed with "proxyauthzdn" privileges.
1489                          *
1490                          * This might actually be too strict, since
1491                          * the "proxyauthzdn" authzTo, and each entry's
1492                          * authzFrom attributes may be crafted
1493                          * to avoid unwanted proxyAuthz to take place.
1494                          */
1495 #if 0
1496                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1497                         rs->sr_text = "proxyAuthz not allowed within namingContext";
1498 #endif
1499                         goto done;
1500                 }
1501
1502                 if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
1503                         goto done;
1504                 }
1505
1506                 if ( BER_BVISNULL( &ndn ) ) {
1507                         goto done;
1508                 }
1509
1510                 if ( BER_BVISNULL( &li->li_idassert_authcDN ) ) {
1511                         goto done;
1512                 }
1513
1514         } else if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
1515                 if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
1516                                 /* && ( !BER_BVISNULL( &ndn )
1517                                         || LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
1518                 {
1519                         /* already asserted in SASL via native authz */
1520                         /* NOTE: the test on lc->lc_bound is used to trap
1521                          * native authorization of anonymous users,
1522                          * since in that case ndn is NULL */
1523                         goto done;
1524                 }
1525
1526         } else if ( li->li_idassert_authz && !be_isroot( op ) ) {
1527                 int             rc;
1528                 struct berval authcDN;
1529
1530                 if ( BER_BVISNULL( &ndn ) ) {
1531                         authcDN = slap_empty_bv;
1532                 } else {
1533                         authcDN = ndn;
1534                 }
1535                 rc = slap_sasl_matches( op, li->li_idassert_authz,
1536                                 &authcDN, & authcDN );
1537                 if ( rc != LDAP_SUCCESS ) {
1538                         if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
1539                         {
1540                                 /* ndn is not authorized
1541                                  * to use idassert */
1542                                 rs->sr_err = rc;
1543                         }
1544                         goto done;
1545                 }
1546         }
1547
1548         if ( op->o_proxy_authz ) {
1549                 /*
1550                  * FIXME: we can:
1551                  * 1) ignore the already set proxyAuthz control
1552                  * 2) leave it in place, and don't set ours
1553                  * 3) add both
1554                  * 4) reject the operation
1555                  *
1556                  * option (4) is very drastic
1557                  * option (3) will make the remote server reject
1558                  * the operation, thus being equivalent to (4)
1559                  * option (2) will likely break the idassert
1560                  * assumptions, so we cannot accept it;
1561                  * option (1) means that we are contradicting
1562                  * the client's reques.
1563                  *
1564                  * I think (4) is the only correct choice.
1565                  */
1566                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1567                 rs->sr_text = "proxyAuthz not allowed within namingContext";
1568         }
1569
1570         if ( op->o_is_auth_check ) {
1571                 mode = LDAP_BACK_IDASSERT_NOASSERT;
1572
1573         } else {
1574                 mode = li->li_idassert_mode;
1575         }
1576
1577         switch ( mode ) {
1578         case LDAP_BACK_IDASSERT_SELF:
1579                 if ( BER_BVISNULL( &ndn ) ) {
1580                         goto done;
1581                 }
1582                 assertedID = ndn;
1583                 break;
1584
1585         case LDAP_BACK_IDASSERT_LEGACY:
1586                 /* original behavior:
1587                  * assert the client's identity */
1588                 if ( BER_BVISNULL( &ndn ) ) {
1589                         assertedID = slap_empty_bv;
1590                 } else {
1591                         assertedID = ndn;
1592                 }
1593                 break;
1594
1595         case LDAP_BACK_IDASSERT_ANONYMOUS:
1596                 /* assert "anonymous" */
1597                 assertedID = slap_empty_bv;
1598                 break;
1599
1600         case LDAP_BACK_IDASSERT_NOASSERT:
1601                 /* don't assert; bind as proxyauthzdn */
1602                 goto done;
1603
1604         case LDAP_BACK_IDASSERT_OTHERID:
1605         case LDAP_BACK_IDASSERT_OTHERDN:
1606                 /* assert idassert DN */
1607                 assertedID = li->li_idassert_authzID;
1608                 break;
1609
1610         default:
1611                 assert( 0 );
1612         }
1613
1614         if ( BER_BVISNULL( &assertedID ) ) {
1615                 assertedID = slap_empty_bv;
1616         }
1617
1618         if ( op->o_ctrls ) {
1619                 for ( i = 0; op->o_ctrls[ i ]; i++ )
1620                         /* just count ctrls */ ;
1621         }
1622
1623         ctrls = op->o_tmpalloc( sizeof( LDAPControl * ) * (i + 2) + sizeof( LDAPControl ),
1624                         op->o_tmpmemctx );
1625         ctrls[ 0 ] = (LDAPControl *)&ctrls[ i + 2 ];
1626
1627         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
1628         ctrls[ 0 ]->ldctl_iscritical = 1;
1629
1630         switch ( li->li_idassert_mode ) {
1631         /* already in u:ID or dn:DN form */
1632         case LDAP_BACK_IDASSERT_OTHERID:
1633         case LDAP_BACK_IDASSERT_OTHERDN:
1634                 ber_dupbv_x( &ctrls[ 0 ]->ldctl_value, &assertedID, op->o_tmpmemctx );
1635                 break;
1636
1637         /* needs the dn: prefix */
1638         default:
1639                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
1640                 ctrls[ 0 ]->ldctl_value.bv_val = op->o_tmpalloc( ctrls[ 0 ]->ldctl_value.bv_len + 1,
1641                                 op->o_tmpmemctx );
1642                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
1643                 AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
1644                                 assertedID.bv_val, assertedID.bv_len + 1 );
1645                 break;
1646         }
1647
1648         /* Older versions of <draft-weltman-ldapv3-proxy> required
1649          * to encode the value of the authzID (and called it proxyDN);
1650          * this hack provides compatibility with those DSAs that
1651          * implement it this way */
1652         if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
1653                 struct berval           authzID = ctrls[ 0 ]->ldctl_value;
1654                 BerElementBuffer        berbuf;
1655                 BerElement              *ber = (BerElement *)&berbuf;
1656                 ber_tag_t               tag;
1657
1658                 ber_init2( ber, 0, LBER_USE_DER );
1659                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1660
1661                 tag = ber_printf( ber, "O", &authzID );
1662                 if ( tag == LBER_ERROR ) {
1663                         rs->sr_err = LDAP_OTHER;
1664                         goto free_ber;
1665                 }
1666
1667                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1668                         rs->sr_err = LDAP_OTHER;
1669                         goto free_ber;
1670                 }
1671
1672 free_ber:;
1673                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1674                 ber_free_buf( ber );
1675
1676                 if ( rs->sr_err != LDAP_SUCCESS ) {
1677                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1678                         ctrls = NULL;
1679                 }
1680
1681         } else if ( li->li_idassert_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
1682                 struct berval           authzID = ctrls[ 0 ]->ldctl_value,
1683                                         tmp;
1684                 BerElementBuffer        berbuf;
1685                 BerElement              *ber = (BerElement *)&berbuf;
1686                 ber_tag_t               tag;
1687
1688                 if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
1689                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1690                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1691                         rs->sr_err = LDAP_PROTOCOL_ERROR;
1692                         goto done;
1693                 }
1694
1695                 tmp = authzID;
1696                 tmp.bv_val += STRLENOF( "dn:" );
1697                 tmp.bv_len -= STRLENOF( "dn:" );
1698
1699                 ber_init2( ber, 0, LBER_USE_DER );
1700                 ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
1701
1702                 /* apparently, Mozilla API encodes this
1703                  * as "SEQUENCE { LDAPDN }" */
1704                 tag = ber_printf( ber, "{O}", &tmp );
1705                 if ( tag == LBER_ERROR ) {
1706                         rs->sr_err = LDAP_OTHER;
1707                         goto free_ber2;
1708                 }
1709
1710                 if ( ber_flatten2( ber, &ctrls[ 0 ]->ldctl_value, 1 ) == -1 ) {
1711                         rs->sr_err = LDAP_OTHER;
1712                         goto free_ber2;
1713                 }
1714
1715 free_ber2:;
1716                 op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
1717                 ber_free_buf( ber );
1718
1719                 if ( rs->sr_err != LDAP_SUCCESS ) {
1720                         op->o_tmpfree( ctrls, op->o_tmpmemctx );
1721                         ctrls = NULL;
1722                         goto done;
1723                 }
1724
1725                 ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
1726         }
1727
1728         if ( op->o_ctrls ) {
1729                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
1730                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
1731                 }
1732         }
1733         ctrls[ i + 1 ] = NULL;
1734
1735 done:;
1736         if ( ctrls == NULL ) {
1737                 ctrls = op->o_ctrls;
1738         }
1739
1740         *pctrls = ctrls;
1741
1742         return rs->sr_err;
1743 }
1744
1745 int
1746 ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
1747 {
1748         LDAPControl     **ctrls = *pctrls;
1749
1750         /* we assume that the first control is the proxyAuthz
1751          * added by back-ldap, so it's the only one we explicitly
1752          * free */
1753         if ( ctrls && ctrls != op->o_ctrls ) {
1754                 assert( ctrls[ 0 ] != NULL );
1755
1756                 if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
1757                         op->o_tmpfree( ctrls[ 0 ]->ldctl_value.bv_val, op->o_tmpmemctx );
1758                 }
1759
1760                 op->o_tmpfree( ctrls, op->o_tmpmemctx );
1761         }
1762
1763         *pctrls = NULL;
1764
1765         return 0;
1766 }