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 1999-2004 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 the 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/socket.h>
  29 #include <ac/string.h>
  30
  31 #define AVL_INTERNAL
  32 #include "slap.h"
  33 #include "back-ldap.h"
  34
  35 #include <lutil_ldap.h>
  36
  37 #define PRINT_CONNTREE 0
  38
  39 static LDAP_REBIND_PROC ldap_back_rebind;
  40
  41 int
  42 ldap_back_bind(
  43     Operation           *op,
  44     SlapReply           *rs )
  45 {
  46         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
  47         struct ldapconn *lc;
  48
  49         struct berval mdn = BER_BVNULL;
  50         int rc = 0;
  51         ber_int_t msgid;
  52         dncookie dc;
  53
  54         lc = ldap_back_getconn(op, rs);
  55         if ( !lc ) {
  56                 return( -1 );
  57         }
  58
  59         /*
  60          * Rewrite the bind dn if needed
  61          */
  62         dc.rwmap = &li->rwmap;
  63 #ifdef ENABLE_REWRITE
  64         dc.conn = op->o_conn;
  65         dc.rs = rs;
  66         dc.ctx = "bindDN";
  67 #else
  68         dc.tofrom = 1;
  69         dc.normalized = 0;
  70 #endif
  71         if ( ldap_back_dn_massage( &dc, &op->o_req_dn, &mdn ) ) {
  72                 send_ldap_result( op, rs );
  73                 return -1;
  74         }
  75
  76         if ( !BER_BVISNULL( &lc->bound_dn ) ) {
  77                 ch_free( lc->bound_dn.bv_val );
  78                 BER_BVZERO( &lc->bound_dn );
  79         }
  80         lc->bound = 0;
  81         /* method is always LDAP_AUTH_SIMPLE if we got here */
  82         rs->sr_err = ldap_sasl_bind(lc->ld, mdn.bv_val, LDAP_SASL_SIMPLE,
  83                 &op->oq_bind.rb_cred, op->o_ctrls, NULL, &msgid);
  84         rc = ldap_back_op_result( lc, op, rs, msgid, 1 );
  85         if (rc == LDAP_SUCCESS) {
  86                 lc->bound = 1;
  87                 if ( mdn.bv_val != op->o_req_dn.bv_val ) {
  88                         lc->bound_dn = mdn;
  89                 } else {
  90                         ber_dupbv( &lc->bound_dn, &op->o_req_dn );
  91                 }
  92                 BER_BVZERO( &mdn );
  93
  94                 if ( li->savecred ) {
  95                         if ( !BER_BVISNULL( &lc->cred ) ) {
  96                                 memset( lc->cred.bv_val, 0, lc->cred.bv_len );
  97                                 ch_free( lc->cred.bv_val );
  98                         }
  99                         ber_dupbv( &lc->cred, &op->oq_bind.rb_cred );
 100                         ldap_set_rebind_proc( lc->ld, ldap_back_rebind, lc );
 101                 }
 102         }
 103
 104         /* must re-insert if local DN changed as result of bind */
 105         if ( lc->bound && !bvmatch(&op->o_req_ndn, &lc->local_dn ) ) {
 106                 int lerr;
 107
 108                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 109                 lc = avl_delete( &li->conntree, (caddr_t)lc,
 110                                 ldap_back_conn_cmp );
 111                 if ( !BER_BVISNULL( &lc->local_dn ) )
 112                         ch_free( lc->local_dn.bv_val );
 113                 ber_dupbv( &lc->local_dn, &op->o_req_ndn );
 114                 lerr = avl_insert( &li->conntree, (caddr_t)lc,
 115                         ldap_back_conn_cmp, ldap_back_conn_dup );
 116                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 117                 if ( lerr == -1 ) {
 118                         ldap_back_conn_free( lc );
 119                 }
 120         }
 121
 122         if ( !BER_BVISNULL( &mdn ) && mdn.bv_val != op->o_req_dn.bv_val ) {
 123                 free( mdn.bv_val );
 124         }
 125
 126         return( rc );
 127 }
 128
 129 /*
 130  * ldap_back_conn_cmp
 131  *
 132  * compares two struct ldapconn based on the value of the conn pointer;
 133  * used by avl stuff
 134  */
 135 int
 136 ldap_back_conn_cmp(
 137         const void *c1,
 138         const void *c2
 139         )
 140 {
 141         const struct ldapconn *lc1 = (const struct ldapconn *)c1;
 142         const struct ldapconn *lc2 = (const struct ldapconn *)c2;
 143         int rc;
 144
 145         /* If local DNs don't match, it is definitely not a match */
 146         if ( ( rc = ber_bvcmp( &lc1->local_dn, &lc2->local_dn ) ) )
 147                 return rc;
 148
 149         /* For shared sessions, conn is NULL. Only explicitly
 150          * bound sessions will have non-NULL conn.
 151          */
 152         return SLAP_PTRCMP(lc1->conn, lc2->conn);
 153 }
 154
 155 /*
 156  * ldap_back_conn_dup
 157  *
 158  * returns -1 in case a duplicate struct ldapconn has been inserted;
 159  * used by avl stuff
 160  */
 161 int
 162 ldap_back_conn_dup(
 163         void *c1,
 164         void *c2
 165         )
 166 {
 167         struct ldapconn *lc1 = (struct ldapconn *)c1;
 168         struct ldapconn *lc2 = (struct ldapconn *)c2;
 169
 170         /* Cannot have more than one shared session with same DN */
 171         if ( dn_match( &lc1->local_dn, &lc2->local_dn ) &&
 172                  lc1->conn == lc2->conn ) return -1;
 173
 174         return 0;
 175 }
 176
 177 #if PRINT_CONNTREE > 0
 178 static void ravl_print( Avlnode *root, int depth )
 179 {
 180         int     i;
 181         struct ldapconn *lc;
 182
 183         if ( root == 0 )
 184                 return;
 185
 186         ravl_print( root->avl_right, depth+1 );
 187
 188         for ( i = 0; i < depth; i++ )
 189                 printf( "   " );
 190
 191         lc = root->avl_data;
 192         printf( "lc(%lx) local(%s) conn(%lx) %d\n",
 193                         lc, lc->local_dn.bv_val, lc->conn, root->avl_bf );
 194
 195         ravl_print( root->avl_left, depth+1 );
 196 }
 197
 198 static void myprint( Avlnode *root )
 199 {
 200         printf( "********\n" );
 201
 202         if ( root == 0 )
 203                 printf( "\tNULL\n" );
 204
 205         else
 206                 ravl_print( root, 0 );
 207
 208         printf( "********\n" );
 209 }
 210 #endif /* PRINT_CONNTREE */
 211
 212 int
 213 ldap_back_freeconn( Operation *op, struct ldapconn *lc )
 214 {
 215         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
 216
 217         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 218         lc = avl_delete( &li->conntree, (caddr_t)lc,
 219                         ldap_back_conn_cmp );
 220         ldap_back_conn_free( (void *)lc );
 221         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 222
 223         return 0;
 224 }
 225
 226 struct ldapconn *
 227 ldap_back_getconn(Operation *op, SlapReply *rs)
 228 {
 229         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 230         struct ldapconn *lc, lc_curr;
 231         LDAP            *ld;
 232         int             is_priv = 0;
 233
 234         /* Searches for a ldapconn in the avl tree */
 235
 236         /* Explicit binds must not be shared */
 237         if ( op->o_tag == LDAP_REQ_BIND
 238                 || ( op->o_conn
 239                         && op->o_conn->c_authz_backend
 240                         && op->o_bd->be_private == op->o_conn->c_authz_backend->be_private ) ) {
 241                 lc_curr.conn = op->o_conn;
 242
 243         } else {
 244                 lc_curr.conn = NULL;
 245         }
 246
 247         /* Internal searches are privileged and shared. So is root. */
 248         if ( op->o_do_not_cache || be_isroot( op ) ) {
 249                 lc_curr.local_dn = op->o_bd->be_rootndn;
 250                 lc_curr.conn = NULL;
 251                 is_priv = 1;
 252
 253         } else {
 254                 lc_curr.local_dn = op->o_ndn;
 255         }
 256
 257         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 258         lc = (struct ldapconn *)avl_find( li->conntree,
 259                 (caddr_t)&lc_curr, ldap_back_conn_cmp );
 260         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 261
 262         /* Looks like we didn't get a bind. Open a new session... */
 263         if (!lc) {
 264                 int vers = op->o_protocol;
 265                 rs->sr_err = ldap_initialize(&ld, li->url);
 266
 267                 if (rs->sr_err != LDAP_SUCCESS) {
 268                         rs->sr_err = slap_map_api2result( rs );
 269                         if (rs->sr_text == NULL) {
 270                                 rs->sr_text = "ldap_initialize() failed";
 271                         }
 272                         if (op->o_conn) send_ldap_result( op, rs );
 273                         rs->sr_text = NULL;
 274                         return( NULL );
 275                 }
 276                 /* Set LDAP version. This will always succeed: If the client
 277                  * bound with a particular version, then so can we.
 278                  */
 279                 ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION,
 280                                 (const void *)&vers);
 281                 /* FIXME: configurable? */
 282                 ldap_set_option(ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON);
 283
 284                 lc = (struct ldapconn *)ch_malloc(sizeof(struct ldapconn));
 285                 lc->conn = lc_curr.conn;
 286                 lc->ld = ld;
 287                 ber_dupbv( &lc->local_dn, &lc_curr.local_dn );
 288
 289 #ifdef ENABLE_REWRITE
 290                 /*
 291                  * Sets a cookie for the rewrite session
 292                  *
 293                  * FIXME: the o_conn might be no longer valid,
 294                  * since we may have different entries
 295                  * for the same connection
 296                  */
 297                 ( void )rewrite_session_init( li->rwmap.rwm_rw, op->o_conn );
 298 #endif /* ENABLE_REWRITE */
 299
 300                 ldap_pvt_thread_mutex_init( &lc->lc_mutex );
 301
 302                 if ( is_priv ) {
 303                         ber_dupbv( &lc->cred, &li->acl_passwd );
 304                         ber_dupbv( &lc->bound_dn, &li->acl_authcDN );
 305
 306                 } else {
 307                         BER_BVZERO( &lc->cred );
 308                         BER_BVZERO( &lc->bound_dn );
 309                         if ( op->o_conn && !BER_BVISEMPTY( &op->o_conn->c_dn )
 310                                         && ( op->o_bd == op->o_conn->c_authz_backend ) ) {
 311
 312                                 dncookie dc;
 313                                 struct berval bv;
 314
 315                                 /*
 316                                  * Rewrite the bind dn if needed
 317                                  */
 318                                 dc.rwmap = &li->rwmap;
 319 #ifdef ENABLE_REWRITE
 320                                 dc.conn = op->o_conn;
 321                                 dc.rs = rs;
 322                                 dc.ctx = "bindDN";
 323 #else
 324                                 dc.tofrom = 1;
 325                                 dc.normalized = 0;
 326 #endif
 327
 328                                 if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn, &bv ) ) {
 329                                         send_ldap_result( op, rs );
 330                                         return NULL;
 331                                 }
 332
 333                                 if ( bv.bv_val == op->o_conn->c_dn.bv_val ) {
 334                                         ber_dupbv( &lc->bound_dn, &bv );
 335                                 } else {
 336                                         lc->bound_dn = bv;
 337                                 }
 338                         }
 339                 }
 340
 341                 lc->bound = 0;
 342
 343                 /* Inserts the newly created ldapconn in the avl tree */
 344                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 345                 rs->sr_err = avl_insert( &li->conntree, (caddr_t)lc,
 346                         ldap_back_conn_cmp, ldap_back_conn_dup );
 347
 348 #if PRINT_CONNTREE > 0
 349                 myprint( li->conntree );
 350 #endif /* PRINT_CONNTREE */
 351
 352                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 353
 354                 Debug( LDAP_DEBUG_TRACE,
 355                         "=>ldap_back_getconn: conn %p inserted\n", (void *) lc, 0, 0 );
 356
 357                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 358                 if ( rs->sr_err != 0 ) {
 359                         ldap_back_conn_free( lc );
 360                         if (op->o_conn) {
 361                                 send_ldap_error( op, rs, LDAP_OTHER,
 362                                 "internal server error" );
 363                         }
 364                         return( NULL );
 365                 }
 366         } else {
 367                 Debug( LDAP_DEBUG_TRACE,
 368                         "=>ldap_back_getconn: conn %p fetched\n", (void *) lc, 0, 0 );
 369         }
 370
 371         return( lc );
 372 }
 373
 374 /*
 375  * ldap_back_dobind
 376  *
 377  * Note: as the check for the value of lc->bound was already here, I removed
 378  * it from all the callers, and I made the function return the flag, so
 379  * it can be used to simplify the check.
 380  */
 381 int
 382 ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs )
 383 {
 384         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 385         int rc;
 386         ber_int_t msgid;
 387
 388         ldap_pvt_thread_mutex_lock( &lc->lc_mutex );
 389         if ( !lc->bound ) {
 390 #ifdef LDAP_BACK_PROXY_AUTHZ
 391                 /*
 392                  * FIXME: we need to let clients use proxyAuthz
 393                  * otherwise we cannot do symmetric pools of servers;
 394                  * we have to live with the fact that a user can
 395                  * authorize itself as any ID that is allowed
 396                  * by the authzTo directive of the "proxyauthzdn".
 397                  */
 398                 /*
 399                  * NOTE: current Proxy Authorization specification
 400                  * and implementation do not allow proxy authorization
 401                  * control to be provided with Bind requests
 402                  */
 403                 /*
 404                  * if no bind took place yet, but the connection is bound
 405                  * and the "proxyauthzdn" is set, then bind as
 406                  * "proxyauthzdn" and explicitly add the proxyAuthz
 407                  * control to every operation with the dn bound
 408                  * to the connection as control value.
 409                  */
 410                 if ( op->o_conn != NULL && BER_BVISNULL( &lc->bound_dn ) ) {
 411                         struct berval   binddn = slap_empty_bv;
 412                         struct berval   bindcred = slap_empty_bv;
 413                         int             dobind = 0;
 414
 415                         /* bind as proxyauthzdn only if no idassert mode
 416                          * is requested, or if the client's identity
 417                          * is authorized */
 418                         switch ( li->idassert_mode ) {
 419                         case LDAP_BACK_IDASSERT_LEGACY:
 420                                 if ( !BER_BVISNULL( &op->o_conn->c_dn ) && !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
 421                                         if ( !BER_BVISNULL( &li->idassert_authcDN ) && !BER_BVISEMPTY( &li->idassert_authcDN ) )
 422                                         {
 423                                                 binddn = li->idassert_authcDN;
 424                                                 bindcred = li->idassert_passwd;
 425                                                 dobind = 1;
 426                                         }
 427                                 }
 428                                 break;
 429
 430                         default:
 431                                 if ( li->idassert_authz ) {
 432                                         struct berval   authcDN = BER_BVISNULL( &op->o_conn->c_dn ) ? slap_empty_bv : op->o_conn->c_dn;
 433
 434                                         rs->sr_err = slap_sasl_matches( op, li->idassert_authz,
 435                                                         &authcDN, &authcDN );
 436                                         if ( rs->sr_err != LDAP_SUCCESS ) {
 437                                                 send_ldap_result( op, rs );
 438                                                 lc->bound = 0;
 439                                                 goto done;
 440                                         }
 441                                 }
 442
 443                                 binddn = li->idassert_authcDN;
 444                                 bindcred = li->idassert_passwd;
 445                                 dobind = 1;
 446                                 break;
 447                         }
 448
 449                         if ( dobind && li->idassert_authmethod == LDAP_AUTH_SASL ) {
 450 #ifdef HAVE_CYRUS_SASL
 451                                 void            *defaults = NULL;
 452                                 struct berval   authzID = BER_BVNULL;
 453                                 int             freeauthz = 0;
 454
 455                                 /* if SASL supports native authz, prepare for it */
 456                                 if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
 457                                                 ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
 458                                 {
 459                                         switch ( li->idassert_mode ) {
 460                                         case LDAP_BACK_IDASSERT_OTHERID:
 461                                         case LDAP_BACK_IDASSERT_OTHERDN:
 462                                                 authzID = li->idassert_authzID;
 463                                                 break;
 464
 465                                         case LDAP_BACK_IDASSERT_ANONYMOUS:
 466                                                 BER_BVSTR( &authzID, "dn:" );
 467                                                 break;
 468
 469                                         case LDAP_BACK_IDASSERT_SELF:
 470                                                 if ( BER_BVISNULL( &op->o_conn->c_dn ) ) {
 471                                                         /* connection is not authc'd, so don't idassert */
 472                                                         BER_BVSTR( &authzID, "dn:" );
 473                                                         break;
 474                                                 }
 475                                                 authzID.bv_len = STRLENOF( "dn:" ) + op->o_conn->c_dn.bv_len;
 476                                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
 477                                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
 478                                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
 479                                                                 op->o_conn->c_dn.bv_val, op->o_conn->c_dn.bv_len + 1 );
 480                                                 freeauthz = 1;
 481                                                 break;
 482
 483                                         default:
 484                                                 break;
 485                                         }
 486                                 }
 487
 488 #if 0   /* will deal with this later... */
 489                                 if ( sasl_secprops != NULL ) {
 490                                         rs->sr_err = ldap_set_option( lc->ld, LDAP_OPT_X_SASL_SECPROPS,
 491                                                 (void *) sasl_secprops );
 492
 493                                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
 494                                                 send_ldap_result( op, rs );
 495                                                 lc->bound = 0;
 496                                                 goto done;
 497
 498                                         }
 499                                 }
 500 #endif
 501
 502                                 defaults = lutil_sasl_defaults( lc->ld,
 503                                                 li->idassert_sasl_mech.bv_val,
 504                                                 li->idassert_sasl_realm.bv_val,
 505                                                 li->idassert_authcID.bv_val,
 506                                                 li->idassert_passwd.bv_val,
 507                                                 authzID.bv_val );
 508
 509                                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->ld, binddn.bv_val,
 510                                                 li->idassert_sasl_mech.bv_val, NULL, NULL,
 511                                                 li->idassert_sasl_flags, lutil_sasl_interact,
 512                                                 defaults );
 513
 514                                 lutil_sasl_freedefs( defaults );
 515                                 if ( freeauthz ) {
 516                                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
 517                                 }
 518
 519                                 rs->sr_err = slap_map_api2result( rs );
 520                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 521                                         lc->bound = 0;
 522                                         send_ldap_result( op, rs );
 523
 524                                 } else {
 525                                         lc->bound = 1;
 526                                 }
 527                                 goto done;
 528 #endif /* HAVE_CYRUS_SASL */
 529                         }
 530
 531                         switch ( li->idassert_authmethod ) {
 532                         case LDAP_AUTH_SIMPLE:
 533                                 rs->sr_err = ldap_sasl_bind(lc->ld,
 534                                                 binddn.bv_val, LDAP_SASL_SIMPLE,
 535                                                 &bindcred, NULL, NULL, &msgid);
 536                                 break;
 537
 538                         case LDAP_AUTH_NONE:
 539                                 lc->bound = 1;
 540                                 goto done;
 541
 542                         default:
 543                                 /* unsupported! */
 544                                 lc->bound = 0;
 545                                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 546                                 send_ldap_result( op, rs );
 547                                 goto done;
 548                         }
 549
 550                 } else
 551 #endif /* LDAP_BACK_PROXY_AUTHZ */
 552                 {
 553                         rs->sr_err = ldap_sasl_bind(lc->ld, lc->bound_dn.bv_val,
 554                                 LDAP_SASL_SIMPLE, &lc->cred, NULL, NULL, &msgid);
 555                 }
 556
 557                 rc = ldap_back_op_result( lc, op, rs, msgid, 0 );
 558                 if (rc == LDAP_SUCCESS) {
 559                         lc->bound = 1;
 560                 }
 561         }
 562
 563 done:;
 564         rc = lc->bound;
 565         ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 566         return rc;
 567 }
 568
 569 /*
 570  * ldap_back_rebind
 571  *
 572  * This is a callback used for chasing referrals using the same
 573  * credentials as the original user on this session.
 574  */
 575 static int
 576 ldap_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 577         ber_int_t msgid, void *params )
 578 {
 579         struct ldapconn *lc = params;
 580
 581         return ldap_bind_s( ld, lc->bound_dn.bv_val, lc->cred.bv_val, LDAP_AUTH_SIMPLE );
 582 }
 583
 584 #if 0 /* deprecated in favour of slap_map_api2result() */
 585 /* Map API errors to protocol errors... */
 586 int
 587 ldap_back_map_result( SlapReply *rs )
 588 {
 589         switch(rs->sr_err)
 590         {
 591         case LDAP_SERVER_DOWN:
 592                 return LDAP_UNAVAILABLE;
 593         case LDAP_LOCAL_ERROR:
 594                 return LDAP_OTHER;
 595         case LDAP_ENCODING_ERROR:
 596         case LDAP_DECODING_ERROR:
 597                 return LDAP_PROTOCOL_ERROR;
 598         case LDAP_TIMEOUT:
 599                 return LDAP_UNAVAILABLE;
 600         case LDAP_AUTH_UNKNOWN:
 601                 return LDAP_AUTH_METHOD_NOT_SUPPORTED;
 602         case LDAP_FILTER_ERROR:
 603                 rs->sr_text = "Filter error";
 604                 return LDAP_OTHER;
 605         case LDAP_USER_CANCELLED:
 606                 rs->sr_text = "User cancelled";
 607                 return LDAP_OTHER;
 608         case LDAP_PARAM_ERROR:
 609                 return LDAP_PROTOCOL_ERROR;
 610         case LDAP_NO_MEMORY:
 611                 return LDAP_OTHER;
 612         case LDAP_CONNECT_ERROR:
 613                 return LDAP_UNAVAILABLE;
 614         case LDAP_NOT_SUPPORTED:
 615                 return LDAP_UNWILLING_TO_PERFORM;
 616         case LDAP_CONTROL_NOT_FOUND:
 617                 return LDAP_PROTOCOL_ERROR;
 618         case LDAP_NO_RESULTS_RETURNED:
 619                 return LDAP_NO_SUCH_OBJECT;
 620         case LDAP_MORE_RESULTS_TO_RETURN:
 621                 rs->sr_text = "More results to return";
 622                 return LDAP_OTHER;
 623         case LDAP_CLIENT_LOOP:
 624         case LDAP_REFERRAL_LIMIT_EXCEEDED:
 625                 return LDAP_LOOP_DETECT;
 626         default:
 627                 if ( LDAP_API_ERROR(rs->sr_err) )
 628                         return LDAP_OTHER;
 629                 return rs->sr_err;
 630         }
 631 }
 632 #endif
 633
 634 int
 635 ldap_back_op_result(struct ldapconn *lc, Operation *op, SlapReply *rs,
 636         ber_int_t msgid, int sendok)
 637 {
 638         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 639         char *match = NULL;
 640         LDAPMessage *res = NULL;
 641         char *text = NULL;
 642
 643 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 644
 645         rs->sr_text = NULL;
 646         rs->sr_matched = NULL;
 647
 648         /* if the error recorded in the reply corresponds
 649          * to a successful state, get the error from the
 650          * remote server response */
 651         if ( ERR_OK( rs->sr_err ) ) {
 652                 /* if result parsing fails, note the failure reason */
 653                 if ( ldap_result( lc->ld, msgid, 1, NULL, &res ) == -1 ) {
 654                         ldap_get_option( lc->ld, LDAP_OPT_ERROR_NUMBER,
 655                                         &rs->sr_err );
 656
 657                 /* otherwise get the result; if it is not
 658                  * LDAP_SUCCESS, record it in the reply
 659                  * structure (this includes
 660                  * LDAP_COMPARE_{TRUE|FALSE}) */
 661                 } else {
 662                         int rc = ldap_parse_result( lc->ld, res, &rs->sr_err,
 663                                         &match, &text, NULL, NULL, 1 );
 664                         rs->sr_text = text;
 665                         if ( rc != LDAP_SUCCESS ) rs->sr_err = rc;
 666                 }
 667         }
 668
 669         /* if the error in the reply structure is not
 670          * LDAP_SUCCESS, try to map it from client
 671          * to server error */
 672         if ( !ERR_OK( rs->sr_err ) ) {
 673                 rs->sr_err = slap_map_api2result( rs );
 674
 675                 /* internal ops ( op->o_conn == NULL )
 676                  * must not reply to client */
 677                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 678                         struct berval dn, mdn;
 679                         dncookie dc;
 680
 681                         dc.rwmap = &li->rwmap;
 682 #ifdef ENABLE_REWRITE
 683                         dc.conn = op->o_conn;
 684                         dc.rs = rs;
 685                         dc.ctx = "matchedDN";
 686 #else
 687                         dc.tofrom = 0;
 688                         dc.normalized = 0;
 689 #endif
 690                         ber_str2bv(match, 0, 0, &dn);
 691                         ldap_back_dn_massage(&dc, &dn, &mdn);
 692
 693                         /* record the (massaged) matched
 694                          * DN into the reply structure */
 695                         rs->sr_matched = mdn.bv_val;
 696
 697                 }
 698         }
 699         if ( op->o_conn && ( sendok || rs->sr_err != LDAP_SUCCESS ) ) {
 700                 send_ldap_result( op, rs );
 701         }
 702         if ( match ) {
 703                 if ( rs->sr_matched != match ) {
 704                         free( (char *)rs->sr_matched );
 705                 }
 706                 rs->sr_matched = NULL;
 707                 ldap_memfree( match );
 708         }
 709         if ( text ) {
 710                 ldap_memfree( text );
 711         }
 712         rs->sr_text = NULL;
 713         return( ERR_OK( rs->sr_err ) ? 0 : -1 );
 714 }
 715
 716 /* return true if bound, false if failed */
 717 int
 718 ldap_back_retry( struct ldapconn *lc, Operation *op, SlapReply *rs )
 719 {
 720         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 721         int vers = op->o_protocol;
 722         LDAP *ld;
 723
 724         ldap_pvt_thread_mutex_lock( &lc->lc_mutex );
 725         ldap_unbind( lc->ld );
 726         lc->bound = 0;
 727         rs->sr_err = ldap_initialize(&ld, li->url);
 728
 729         if (rs->sr_err != LDAP_SUCCESS) {
 730                 rs->sr_err = slap_map_api2result( rs );
 731                 if (rs->sr_text == NULL) {
 732                         rs->sr_text = "ldap_initialize() failed";
 733                 }
 734                 if (op->o_conn) send_ldap_result( op, rs );
 735                 rs->sr_text = NULL;
 736                 return 0;
 737         }
 738         /* Set LDAP version. This will always succeed: If the client
 739          * bound with a particular version, then so can we.
 740          */
 741         ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&vers);
 742         /* FIXME: configurable? */
 743         ldap_set_option(ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON);
 744         lc->ld = ld;
 745         ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 746         return ldap_back_dobind( lc, op, rs );
 747 }
 748
 749 #ifdef LDAP_BACK_PROXY_AUTHZ
 750 /*
 751  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
 752  * to existing server-side controls if required; if not,
 753  * the existing server-side controls are placed in *pctrls.
 754  * The caller, after using the controls in client API
 755  * operations, if ( *pctrls != op->o_ctrls ), should
 756  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
 757  * The function returns success if the control could
 758  * be added if required, or if it did nothing; in the future,
 759  * it might return some error if it failed.
 760  *
 761  * if no bind took place yet, but the connection is bound
 762  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
 763  * and explicitly add proxyAuthz the control to every operation
 764  * with the dn bound to the connection as control value.
 765  *
 766  * If no server-side controls are defined for the operation,
 767  * simply add the proxyAuthz control; otherwise, if the
 768  * proxyAuthz control is not already set, add it as
 769  * the first one (FIXME: is controls order significant
 770  * for security?).
 771  */
 772 int
 773 ldap_back_proxy_authz_ctrl(
 774                 struct ldapconn *lc,
 775                 Operation       *op,
 776                 SlapReply       *rs,
 777                 LDAPControl     ***pctrls )
 778 {
 779         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
 780         LDAPControl     **ctrls = NULL;
 781         int             i = 0,
 782                         mode;
 783         struct berval   assertedID;
 784
 785         *pctrls = NULL;
 786
 787         if ( ( BER_BVISNULL( &li->idassert_authcID ) || BER_BVISEMPTY( &li->idassert_authcID ) )
 788                         && ( BER_BVISNULL( &li->idassert_authcDN ) || BER_BVISEMPTY( &li->idassert_authcDN ) ) ) {
 789                 goto done;
 790         }
 791
 792         if ( !op->o_conn ) {
 793                 goto done;
 794         }
 795
 796         if ( li->idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
 797                 if ( op->o_proxy_authz ) {
 798                         /*
 799                          * FIXME: we do not want to perform proxyAuthz
 800                          * on behalf of the client, because this would
 801                          * be performed with "proxyauthzdn" privileges.
 802                          *
 803                          * This might actually be too strict, since
 804                          * the "proxyauthzdn" authzTo, and each entry's
 805                          * authzFrom attributes may be crafted
 806                          * to avoid unwanted proxyAuthz to take place.
 807                          */
 808 #if 0
 809                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 810                         rs->sr_text = "proxyAuthz not allowed within namingContext";
 811 #endif
 812                         goto done;
 813                 }
 814
 815                 if ( !BER_BVISNULL( &lc->bound_dn ) ) {
 816                         goto done;
 817                 }
 818
 819                 if ( BER_BVISNULL( &op->o_conn->c_dn ) ) {
 820                         goto done;
 821                 }
 822
 823                 if ( BER_BVISNULL( &li->idassert_authcDN ) ) {
 824                         goto done;
 825                 }
 826
 827         } else if ( li->idassert_authmethod == LDAP_AUTH_SASL ) {
 828                 if ( ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
 829                                 /* && ( !BER_BVISNULL( &op->o_conn->c_dn ) || lc->bound ) */ )
 830                 {
 831                         /* already asserted in SASL via native authz */
 832                         /* NOTE: the test on lc->bound is used to trap
 833                          * native authorization of anonymous users,
 834                          * since in that case op->o_conn->c_dn is NULL */
 835                         goto done;
 836                 }
 837
 838         } else if ( li->idassert_authz ) {
 839                 int             rc;
 840                 struct berval   authcDN = BER_BVISNULL( &op->o_conn->c_dn ) ? slap_empty_bv : op->o_conn->c_dn;
 841
 842
 843                 rc = slap_sasl_matches( op, li->idassert_authz,
 844                                 &authcDN, & authcDN );
 845                 if ( rc != LDAP_SUCCESS ) {
 846                         /* op->o_conn->c_dn is not authorized
 847                          * to use idassert */
 848                         return rc;
 849                 }
 850         }
 851
 852         if ( op->o_proxy_authz ) {
 853                 /*
 854                  * FIXME: we can:
 855                  * 1) ignore the already set proxyAuthz control
 856                  * 2) leave it in place, and don't set ours
 857                  * 3) add both
 858                  * 4) reject the operation
 859                  *
 860                  * option (4) is very drastic
 861                  * option (3) will make the remote server reject
 862                  * the operation, thus being equivalent to (4)
 863                  * option (2) will likely break the idassert
 864                  * assumptions, so we cannot accept it;
 865                  * option (1) means that we are contradicting
 866                  * the client's reques.
 867                  *
 868                  * I think (4) is the only correct choice.
 869                  */
 870                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 871                 rs->sr_text = "proxyAuthz not allowed within namingContext";
 872         }
 873
 874         if ( op->o_do_not_cache && op->o_is_auth_check ) {
 875                 mode = LDAP_BACK_IDASSERT_NOASSERT;
 876
 877         } else {
 878                 mode = li->idassert_mode;
 879         }
 880
 881         switch ( mode ) {
 882         case LDAP_BACK_IDASSERT_LEGACY:
 883         case LDAP_BACK_IDASSERT_SELF:
 884                 /* original behavior:
 885                  * assert the client's identity */
 886                 assertedID = BER_BVISNULL( &op->o_conn->c_dn ) ? slap_empty_bv : op->o_conn->c_dn;
 887                 break;
 888
 889         case LDAP_BACK_IDASSERT_ANONYMOUS:
 890                 /* assert "anonymous" */
 891                 assertedID = slap_empty_bv;
 892                 break;
 893
 894         case LDAP_BACK_IDASSERT_NOASSERT:
 895                 /* don't assert; bind as proxyauthzdn */
 896                 goto done;
 897
 898         case LDAP_BACK_IDASSERT_OTHERID:
 899         case LDAP_BACK_IDASSERT_OTHERDN:
 900                 /* assert idassert DN */
 901                 assertedID = li->idassert_authzID;
 902                 break;
 903
 904         default:
 905                 assert( 0 );
 906         }
 907
 908         if ( BER_BVISNULL( &assertedID ) ) {
 909                 assertedID = slap_empty_bv;
 910         }
 911
 912         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
 913         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
 914
 915         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
 916         ctrls[ 0 ]->ldctl_iscritical = 1;
 917
 918         switch ( li->idassert_mode ) {
 919         /* already in u:ID or dn:DN form */
 920         case LDAP_BACK_IDASSERT_OTHERID:
 921         case LDAP_BACK_IDASSERT_OTHERDN:
 922                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
 923                 break;
 924
 925         /* needs the dn: prefix */
 926         default:
 927                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
 928                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
 929                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
 930                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val + STRLENOF( "dn:" ),
 931                                 assertedID.bv_val, assertedID.bv_len + 1 );
 932                 break;
 933         }
 934
 935         if ( op->o_ctrls ) {
 936                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
 937                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
 938                 }
 939         }
 940         ctrls[ i + 1 ] = NULL;
 941
 942 done:;
 943         if ( ctrls == NULL ) {
 944                 ctrls = op->o_ctrls;
 945         }
 946
 947         *pctrls = ctrls;
 948
 949         return rs->sr_err;
 950 }
 951 #endif /* LDAP_BACK_PROXY_AUTHZ */