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_bd == op->o_conn->c_authz_backend ))) {
 240                 lc_curr.conn = op->o_conn;
 241
 242         } else {
 243                 lc_curr.conn = NULL;
 244         }
 245
 246         /* Internal searches are privileged and shared. So is root. */
 247         if ( op->o_do_not_cache || be_isroot( op ) ) {
 248                 lc_curr.local_dn = op->o_bd->be_rootndn;
 249                 lc_curr.conn = NULL;
 250                 is_priv = 1;
 251
 252         } else {
 253                 lc_curr.local_dn = op->o_ndn;
 254         }
 255
 256         ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 257         lc = (struct ldapconn *)avl_find( li->conntree,
 258                 (caddr_t)&lc_curr, ldap_back_conn_cmp );
 259         ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 260
 261         /* Looks like we didn't get a bind. Open a new session... */
 262         if (!lc) {
 263                 int vers = op->o_protocol;
 264                 rs->sr_err = ldap_initialize(&ld, li->url);
 265
 266                 if (rs->sr_err != LDAP_SUCCESS) {
 267                         rs->sr_err = slap_map_api2result( rs );
 268                         if (rs->sr_text == NULL) {
 269                                 rs->sr_text = "ldap_initialize() failed";
 270                         }
 271                         if (op->o_conn) send_ldap_result( op, rs );
 272                         rs->sr_text = NULL;
 273                         return( NULL );
 274                 }
 275                 /* Set LDAP version. This will always succeed: If the client
 276                  * bound with a particular version, then so can we.
 277                  */
 278                 ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION,
 279                                 (const void *)&vers);
 280                 /* FIXME: configurable? */
 281                 ldap_set_option(ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON);
 282
 283                 lc = (struct ldapconn *)ch_malloc(sizeof(struct ldapconn));
 284                 lc->conn = lc_curr.conn;
 285                 lc->ld = ld;
 286                 ber_dupbv( &lc->local_dn, &lc_curr.local_dn );
 287
 288 #ifdef ENABLE_REWRITE
 289                 /*
 290                  * Sets a cookie for the rewrite session
 291                  *
 292                  * FIXME: the o_conn might be no longer valid,
 293                  * since we may have different entries
 294                  * for the same connection
 295                  */
 296                 ( void )rewrite_session_init( li->rwmap.rwm_rw, op->o_conn );
 297 #endif /* ENABLE_REWRITE */
 298
 299                 ldap_pvt_thread_mutex_init( &lc->lc_mutex );
 300
 301                 if ( is_priv ) {
 302                         ber_dupbv( &lc->cred, &li->acl_passwd );
 303                         ber_dupbv( &lc->bound_dn, &li->acl_authcDN );
 304
 305                 } else {
 306                         BER_BVZERO( &lc->cred );
 307                         BER_BVZERO( &lc->bound_dn );
 308                         if ( op->o_conn && !BER_BVISEMPTY( &op->o_conn->c_dn )
 309                                         && ( op->o_bd == op->o_conn->c_authz_backend ) ) {
 310
 311                                 dncookie dc;
 312                                 struct berval bv;
 313
 314                                 /*
 315                                  * Rewrite the bind dn if needed
 316                                  */
 317                                 dc.rwmap = &li->rwmap;
 318 #ifdef ENABLE_REWRITE
 319                                 dc.conn = op->o_conn;
 320                                 dc.rs = rs;
 321                                 dc.ctx = "bindDN";
 322 #else
 323                                 dc.tofrom = 1;
 324                                 dc.normalized = 0;
 325 #endif
 326
 327                                 if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn, &bv ) ) {
 328                                         send_ldap_result( op, rs );
 329                                         return NULL;
 330                                 }
 331
 332                                 if ( bv.bv_val == op->o_conn->c_dn.bv_val ) {
 333                                         ber_dupbv( &lc->bound_dn, &bv );
 334                                 } else {
 335                                         lc->bound_dn = bv;
 336                                 }
 337                         }
 338                 }
 339
 340                 lc->bound = 0;
 341
 342                 /* Inserts the newly created ldapconn in the avl tree */
 343                 ldap_pvt_thread_mutex_lock( &li->conn_mutex );
 344                 rs->sr_err = avl_insert( &li->conntree, (caddr_t)lc,
 345                         ldap_back_conn_cmp, ldap_back_conn_dup );
 346
 347 #if PRINT_CONNTREE > 0
 348                 myprint( li->conntree );
 349 #endif /* PRINT_CONNTREE */
 350
 351                 ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
 352
 353 #ifdef NEW_LOGGING
 354                 LDAP_LOG( BACK_LDAP, INFO,
 355                         "ldap_back_getconn: conn %p inserted\n", (void *) lc, 0, 0);
 356 #else /* !NEW_LOGGING */
 357                 Debug( LDAP_DEBUG_TRACE,
 358                         "=>ldap_back_getconn: conn %p inserted\n", (void *) lc, 0, 0 );
 359 #endif /* !NEW_LOGGING */
 360
 361                 /* Err could be -1 in case a duplicate ldapconn is inserted */
 362                 if ( rs->sr_err != 0 ) {
 363                         ldap_back_conn_free( lc );
 364                         if (op->o_conn) {
 365                                 send_ldap_error( op, rs, LDAP_OTHER,
 366                                 "internal server error" );
 367                         }
 368                         return( NULL );
 369                 }
 370         } else {
 371 #ifdef NEW_LOGGING
 372                 LDAP_LOG( BACK_LDAP, INFO,
 373                         "ldap_back_getconn: conn %p fetched\n",
 374                         (void *) lc, 0, 0 );
 375 #else /* !NEW_LOGGING */
 376                 Debug( LDAP_DEBUG_TRACE,
 377                         "=>ldap_back_getconn: conn %p fetched\n", (void *) lc, 0, 0 );
 378 #endif /* !NEW_LOGGING */
 379         }
 380
 381         return( lc );
 382 }
 383
 384 /*
 385  * ldap_back_dobind
 386  *
 387  * Note: as the check for the value of lc->bound was already here, I removed
 388  * it from all the callers, and I made the function return the flag, so
 389  * it can be used to simplify the check.
 390  */
 391 int
 392 ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs )
 393 {
 394         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 395         int rc;
 396         ber_int_t msgid;
 397
 398         ldap_pvt_thread_mutex_lock( &lc->lc_mutex );
 399         if ( !lc->bound ) {
 400 #ifdef LDAP_BACK_PROXY_AUTHZ
 401                 /*
 402                  * FIXME: we need to let clients use proxyAuthz
 403                  * otherwise we cannot do symmetric pools of servers;
 404                  * we have to live with the fact that a user can
 405                  * authorize itself as any ID that is allowed
 406                  * by the authzTo directive of the "proxyauthzdn".
 407                  */
 408                 /*
 409                  * NOTE: current Proxy Authorization specification
 410                  * and implementation do not allow proxy authorization
 411                  * control to be provided with Bind requests
 412                  */
 413                 /*
 414                  * if no bind took place yet, but the connection is bound
 415                  * and the "proxyauthzdn" is set, then bind as
 416                  * "proxyauthzdn" and explicitly add the proxyAuthz
 417                  * control to every operation with the dn bound
 418                  * to the connection as control value.
 419                  */
 420                 if ( op->o_conn != NULL && BER_BVISNULL( &lc->bound_dn ) ) {
 421                         struct berval   binddn = slap_empty_bv;
 422                         struct berval   bindcred = slap_empty_bv;
 423                         int             dobind = 0;
 424
 425                         /* bind as proxyauthzdn only if no idassert mode
 426                          * is requested, or if the client's identity
 427                          * is authorized */
 428                         switch ( li->idassert_mode ) {
 429                         case LDAP_BACK_IDASSERT_LEGACY:
 430                                 if ( !BER_BVISNULL( &op->o_conn->c_dn ) && !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
 431                                         if ( !BER_BVISNULL( &li->idassert_authcDN ) && !BER_BVISEMPTY( &li->idassert_authcDN ) )
 432                                         {
 433                                                 binddn = li->idassert_authcDN;
 434                                                 bindcred = li->idassert_passwd;
 435                                                 dobind = 1;
 436                                         }
 437                                 }
 438                                 break;
 439
 440                         default:
 441                                 if ( li->idassert_authz ) {
 442                                         struct berval   authcDN = BER_BVISNULL( &op->o_conn->c_dn ) ? slap_empty_bv : op->o_conn->c_dn;
 443
 444                                         rs->sr_err = slap_sasl_matches( op, li->idassert_authz,
 445                                                         &authcDN, &authcDN );
 446                                         if ( rs->sr_err != LDAP_SUCCESS ) {
 447                                                 send_ldap_result( op, rs );
 448                                                 lc->bound = 0;
 449                                                 goto done;
 450                                         }
 451                                 }
 452
 453                                 binddn = li->idassert_authcDN;
 454                                 bindcred = li->idassert_passwd;
 455                                 dobind = 1;
 456                                 break;
 457                         }
 458
 459                         if ( dobind && li->idassert_authmethod == LDAP_AUTH_SASL ) {
 460 #ifdef HAVE_CYRUS_SASL
 461                                 void            *defaults = NULL;
 462                                 struct berval   authzID = BER_BVNULL;
 463                                 int             freeauthz = 0;
 464
 465                                 /* if SASL supports native authz, prepare for it */
 466                                 if ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) {
 467                                         switch ( li->idassert_mode ) {
 468                                         case LDAP_BACK_IDASSERT_OTHERID:
 469                                         case LDAP_BACK_IDASSERT_OTHERDN:
 470                                                 authzID = li->idassert_authzID;
 471                                                 break;
 472
 473                                         case LDAP_BACK_IDASSERT_ANONYMOUS:
 474                                                 BER_BVSTR( &authzID, "dn:" );
 475                                                 break;
 476
 477                                         case LDAP_BACK_IDASSERT_SELF:
 478                                                 if ( BER_BVISNULL( &op->o_conn->c_dn ) ) {
 479                                                         /* connection is not authc'd, so don't idassert */
 480                                                         BER_BVSTR( &authzID, "dn:" );
 481                                                         break;
 482                                                 }
 483                                                 authzID.bv_len = STRLENOF( "dn:" ) + op->o_conn->c_dn.bv_len;
 484                                                 authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
 485                                                 AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
 486                                                 AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
 487                                                                 op->o_conn->c_dn.bv_val, op->o_conn->c_dn.bv_len + 1 );
 488                                                 freeauthz = 1;
 489                                                 break;
 490
 491                                         default:
 492                                                 break;
 493                                         }
 494                                 }
 495
 496 #if 0   /* will deal with this later... */
 497                                 if ( sasl_secprops != NULL ) {
 498                                         rs->sr_err = ldap_set_option( lc->ld, LDAP_OPT_X_SASL_SECPROPS,
 499                                                 (void *) sasl_secprops );
 500
 501                                         if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
 502                                                 send_ldap_result( op, rs );
 503                                                 lc->bound = 0;
 504                                                 goto done;
 505
 506                                         }
 507                                 }
 508 #endif
 509
 510                                 defaults = lutil_sasl_defaults( lc->ld,
 511                                                 li->idassert_sasl_mech.bv_val,
 512                                                 li->idassert_sasl_realm.bv_val,
 513                                                 li->idassert_authcID.bv_val,
 514                                                 li->idassert_passwd.bv_val,
 515                                                 authzID.bv_val );
 516
 517                                 rs->sr_err = ldap_sasl_interactive_bind_s( lc->ld, binddn.bv_val,
 518                                                 li->idassert_sasl_mech.bv_val, NULL, NULL,
 519                                                 li->idassert_sasl_flags, lutil_sasl_interact,
 520                                                 defaults );
 521
 522                                 lutil_sasl_freedefs( defaults );
 523                                 if ( freeauthz ) {
 524                                         slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
 525                                 }
 526
 527                                 rs->sr_err = slap_map_api2result( rs );
 528                                 if ( rs->sr_err != LDAP_SUCCESS ) {
 529                                         lc->bound = 0;
 530                                         send_ldap_result( op, rs );
 531
 532                                 } else {
 533                                         lc->bound = 1;
 534                                 }
 535                                 goto done;
 536 #endif /* HAVE_CYRUS_SASL */
 537                         }
 538
 539                         switch ( li->idassert_authmethod ) {
 540                         case LDAP_AUTH_SIMPLE:
 541                                 rs->sr_err = ldap_sasl_bind(lc->ld,
 542                                                 binddn.bv_val, LDAP_SASL_SIMPLE,
 543                                                 &bindcred, NULL, NULL, &msgid);
 544                                 break;
 545
 546                         case LDAP_AUTH_NONE:
 547                                 lc->bound = 1;
 548                                 goto done;
 549
 550                         default:
 551                                 /* unsupported! */
 552                                 lc->bound = 0;
 553                                 rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 554                                 send_ldap_result( op, rs );
 555                                 goto done;
 556                         }
 557
 558                 } else
 559 #endif /* LDAP_BACK_PROXY_AUTHZ */
 560                 {
 561                         rs->sr_err = ldap_sasl_bind(lc->ld, lc->bound_dn.bv_val,
 562                                 LDAP_SASL_SIMPLE, &lc->cred, NULL, NULL, &msgid);
 563                 }
 564
 565                 rc = ldap_back_op_result( lc, op, rs, msgid, 0 );
 566                 if (rc == LDAP_SUCCESS) {
 567                         lc->bound = 1;
 568                 }
 569         }
 570
 571 done:;
 572         rc = lc->bound;
 573         ldap_pvt_thread_mutex_unlock( &lc->lc_mutex );
 574         return rc;
 575 }
 576
 577 /*
 578  * ldap_back_rebind
 579  *
 580  * This is a callback used for chasing referrals using the same
 581  * credentials as the original user on this session.
 582  */
 583 static int
 584 ldap_back_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
 585         ber_int_t msgid, void *params )
 586 {
 587         struct ldapconn *lc = params;
 588
 589         return ldap_bind_s( ld, lc->bound_dn.bv_val, lc->cred.bv_val, LDAP_AUTH_SIMPLE );
 590 }
 591
 592 #if 0 /* deprecated in favour of slap_map_api2result() */
 593 /* Map API errors to protocol errors... */
 594 int
 595 ldap_back_map_result( SlapReply *rs )
 596 {
 597         switch(rs->sr_err)
 598         {
 599         case LDAP_SERVER_DOWN:
 600                 return LDAP_UNAVAILABLE;
 601         case LDAP_LOCAL_ERROR:
 602                 return LDAP_OTHER;
 603         case LDAP_ENCODING_ERROR:
 604         case LDAP_DECODING_ERROR:
 605                 return LDAP_PROTOCOL_ERROR;
 606         case LDAP_TIMEOUT:
 607                 return LDAP_UNAVAILABLE;
 608         case LDAP_AUTH_UNKNOWN:
 609                 return LDAP_AUTH_METHOD_NOT_SUPPORTED;
 610         case LDAP_FILTER_ERROR:
 611                 rs->sr_text = "Filter error";
 612                 return LDAP_OTHER;
 613         case LDAP_USER_CANCELLED:
 614                 rs->sr_text = "User cancelled";
 615                 return LDAP_OTHER;
 616         case LDAP_PARAM_ERROR:
 617                 return LDAP_PROTOCOL_ERROR;
 618         case LDAP_NO_MEMORY:
 619                 return LDAP_OTHER;
 620         case LDAP_CONNECT_ERROR:
 621                 return LDAP_UNAVAILABLE;
 622         case LDAP_NOT_SUPPORTED:
 623                 return LDAP_UNWILLING_TO_PERFORM;
 624         case LDAP_CONTROL_NOT_FOUND:
 625                 return LDAP_PROTOCOL_ERROR;
 626         case LDAP_NO_RESULTS_RETURNED:
 627                 return LDAP_NO_SUCH_OBJECT;
 628         case LDAP_MORE_RESULTS_TO_RETURN:
 629                 rs->sr_text = "More results to return";
 630                 return LDAP_OTHER;
 631         case LDAP_CLIENT_LOOP:
 632         case LDAP_REFERRAL_LIMIT_EXCEEDED:
 633                 return LDAP_LOOP_DETECT;
 634         default:
 635                 if ( LDAP_API_ERROR(rs->sr_err) )
 636                         return LDAP_OTHER;
 637                 return rs->sr_err;
 638         }
 639 }
 640 #endif
 641
 642 int
 643 ldap_back_op_result(struct ldapconn *lc, Operation *op, SlapReply *rs,
 644         ber_int_t msgid, int sendok)
 645 {
 646         struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
 647         char *match = NULL;
 648         LDAPMessage *res = NULL;
 649         char *text = NULL;
 650
 651 #define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
 652
 653         rs->sr_text = NULL;
 654         rs->sr_matched = NULL;
 655
 656         /* if the error recorded in the reply corresponds
 657          * to a successful state, get the error from the
 658          * remote server response */
 659         if ( ERR_OK( rs->sr_err ) ) {
 660                 /* if result parsing fails, note the failure reason */
 661                 if ( ldap_result( lc->ld, msgid, 1, NULL, &res ) == -1 ) {
 662                         ldap_get_option( lc->ld, LDAP_OPT_ERROR_NUMBER,
 663                                         &rs->sr_err );
 664
 665                 /* otherwise get the result; if it is not
 666                  * LDAP_SUCCESS, record it in the reply
 667                  * structure (this includes
 668                  * LDAP_COMPARE_{TRUE|FALSE}) */
 669                 } else {
 670                         int rc = ldap_parse_result( lc->ld, res, &rs->sr_err,
 671                                         &match, &text, NULL, NULL, 1 );
 672                         rs->sr_text = text;
 673                         if ( rc != LDAP_SUCCESS ) rs->sr_err = rc;
 674                 }
 675         }
 676
 677         /* if the error in the reply structure is not
 678          * LDAP_SUCCESS, try to map it from client
 679          * to server error */
 680         if ( !ERR_OK( rs->sr_err ) ) {
 681                 rs->sr_err = slap_map_api2result( rs );
 682
 683                 /* internal ops ( op->o_conn == NULL )
 684                  * must not reply to client */
 685                 if ( op->o_conn && !op->o_do_not_cache && match ) {
 686                         struct berval dn, mdn;
 687                         dncookie dc;
 688
 689                         dc.rwmap = &li->rwmap;
 690 #ifdef ENABLE_REWRITE
 691                         dc.conn = op->o_conn;
 692                         dc.rs = rs;
 693                         dc.ctx = "matchedDN";
 694 #else
 695                         dc.tofrom = 0;
 696                         dc.normalized = 0;
 697 #endif
 698                         ber_str2bv(match, 0, 0, &dn);
 699                         ldap_back_dn_massage(&dc, &dn, &mdn);
 700
 701                         /* record the (massaged) matched
 702                          * DN into the reply structure */
 703                         rs->sr_matched = mdn.bv_val;
 704
 705                 }
 706         }
 707         if ( op->o_conn && ( sendok || rs->sr_err != LDAP_SUCCESS ) ) {
 708                 send_ldap_result( op, rs );
 709         }
 710         if ( match ) {
 711                 if ( rs->sr_matched != match ) {
 712                         free( (char *)rs->sr_matched );
 713                 }
 714                 rs->sr_matched = NULL;
 715                 ldap_memfree( match );
 716         }
 717         if ( text ) {
 718                 ldap_memfree( text );
 719         }
 720         rs->sr_text = NULL;
 721         return( ERR_OK( rs->sr_err ) ? 0 : -1 );
 722 }
 723
 724 #ifdef LDAP_BACK_PROXY_AUTHZ
 725 /*
 726  * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
 727  * to existing server-side controls if required; if not,
 728  * the existing server-side controls are placed in *pctrls.
 729  * The caller, after using the controls in client API
 730  * operations, if ( *pctrls != op->o_ctrls ), should
 731  * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
 732  * The function returns success if the control could
 733  * be added if required, or if it did nothing; in the future,
 734  * it might return some error if it failed.
 735  *
 736  * if no bind took place yet, but the connection is bound
 737  * and the "proxyauthzdn" is set, then bind as "proxyauthzdn"
 738  * and explicitly add proxyAuthz the control to every operation
 739  * with the dn bound to the connection as control value.
 740  *
 741  * If no server-side controls are defined for the operation,
 742  * simply add the proxyAuthz control; otherwise, if the
 743  * proxyAuthz control is not already set, add it as
 744  * the first one (FIXME: is controls order significant
 745  * for security?).
 746  */
 747 int
 748 ldap_back_proxy_authz_ctrl(
 749                 struct ldapconn *lc,
 750                 Operation       *op,
 751                 SlapReply       *rs,
 752                 LDAPControl     ***pctrls )
 753 {
 754         struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
 755         LDAPControl     **ctrls = NULL;
 756         int             i = 0;
 757         struct berval   assertedID;
 758
 759         *pctrls = NULL;
 760
 761         if ( ( BER_BVISNULL( &li->idassert_authcID ) || BER_BVISEMPTY( &li->idassert_authcID ) )
 762                         && ( BER_BVISNULL( &li->idassert_authcDN ) || BER_BVISEMPTY( &li->idassert_authcDN ) ) ) {
 763                 goto done;
 764         }
 765
 766         if ( !op->o_conn ) {
 767                 goto done;
 768         }
 769
 770         if ( li->idassert_mode == LDAP_BACK_IDASSERT_LEGACY ) {
 771                 if ( op->o_proxy_authz ) {
 772                         /*
 773                          * FIXME: we do not want to perform proxyAuthz
 774                          * on behalf of the client, because this would
 775                          * be performed with "proxyauthzdn" privileges.
 776                          *
 777                          * This might actually be too strict, since
 778                          * the "proxyauthzdn" authzTo, and each entry's
 779                          * authzFrom attributes may be crafted
 780                          * to avoid unwanted proxyAuthz to take place.
 781                          */
 782 #if 0
 783                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 784                         rs->sr_text = "proxyAuthz not allowed within namingContext";
 785 #endif
 786                         goto done;
 787                 }
 788
 789                 if ( !BER_BVISNULL( &lc->bound_dn ) ) {
 790                         goto done;
 791                 }
 792
 793                 if ( BER_BVISNULL( &op->o_conn->c_dn ) ) {
 794                         goto done;
 795                 }
 796
 797                 if ( BER_BVISNULL( &li->idassert_authcDN ) ) {
 798                         goto done;
 799                 }
 800
 801         } else if ( li->idassert_authmethod == LDAP_AUTH_SASL ) {
 802                 if ( ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
 803                                 /* && ( !BER_BVISNULL( &op->o_conn->c_dn ) || lc->bound ) */ )
 804                 {
 805                         /* already asserted in SASL via native authz */
 806                         /* NOTE: the test on lc->bound is used to trap
 807                          * native authorization of anonymous users,
 808                          * since in that case op->o_conn->c_dn is NULL */
 809                         goto done;
 810                 }
 811
 812         } else if ( li->idassert_authz ) {
 813                 int             rc;
 814                 struct berval   authcDN = BER_BVISNULL( &op->o_conn->c_dn ) ? slap_empty_bv : op->o_conn->c_dn;
 815
 816
 817                 rc = slap_sasl_matches( op, li->idassert_authz,
 818                                 &authcDN, & authcDN );
 819                 if ( rc != LDAP_SUCCESS ) {
 820                         /* op->o_conn->c_dn is not authorized
 821                          * to use idassert */
 822                         return rc;
 823                 }
 824         }
 825
 826         if ( op->o_proxy_authz ) {
 827                 /*
 828                  * FIXME: we can:
 829                  * 1) ignore the already set proxyAuthz control
 830                  * 2) leave it in place, and don't set ours
 831                  * 3) add both
 832                  * 4) reject the operation
 833                  *
 834                  * option (4) is very drastic
 835                  * option (3) will make the remote server reject
 836                  * the operation, thus being equivalent to (4)
 837                  * option (2) will likely break the idassert
 838                  * assumptions, so we cannot accept it;
 839                  * option (1) means that we are contradicting
 840                  * the client's reques.
 841                  *
 842                  * I think (4) is the only correct choice.
 843                  */
 844                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
 845                 rs->sr_text = "proxyAuthz not allowed within namingContext";
 846         }
 847
 848         switch ( li->idassert_mode ) {
 849         case LDAP_BACK_IDASSERT_LEGACY:
 850         case LDAP_BACK_IDASSERT_SELF:
 851                 /* original behavior:
 852                  * assert the client's identity */
 853                 assertedID = BER_BVISNULL( &op->o_conn->c_dn ) ? slap_empty_bv : op->o_conn->c_dn;
 854                 break;
 855
 856         case LDAP_BACK_IDASSERT_ANONYMOUS:
 857                 /* assert "anonymous" */
 858                 assertedID = slap_empty_bv;
 859                 break;
 860
 861         case LDAP_BACK_IDASSERT_NOASSERT:
 862                 /* don't assert; bind as proxyauthzdn */
 863                 goto done;
 864
 865         case LDAP_BACK_IDASSERT_OTHERID:
 866         case LDAP_BACK_IDASSERT_OTHERDN:
 867                 /* assert idassert DN */
 868                 assertedID = li->idassert_authzID;
 869                 break;
 870
 871         default:
 872                 assert( 0 );
 873         }
 874
 875         if ( BER_BVISNULL( &assertedID ) ) {
 876                 assertedID = slap_empty_bv;
 877         }
 878
 879         ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
 880         ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
 881
 882         ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
 883         ctrls[ 0 ]->ldctl_iscritical = 1;
 884
 885         switch ( li->idassert_mode ) {
 886         /* already in u:ID or dn:DN form */
 887         case LDAP_BACK_IDASSERT_OTHERID:
 888         case LDAP_BACK_IDASSERT_OTHERDN:
 889                 ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
 890                 break;
 891
 892         /* needs the dn: prefix */
 893         default:
 894                 ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
 895                 ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
 896                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
 897                 AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val + STRLENOF( "dn:" ),
 898                                 assertedID.bv_val, assertedID.bv_len + 1 );
 899                 break;
 900         }
 901
 902         if ( op->o_ctrls ) {
 903                 for ( i = 0; op->o_ctrls[ i ]; i++ ) {
 904                         ctrls[ i + 1 ] = op->o_ctrls[ i ];
 905                 }
 906         }
 907         ctrls[ i + 1 ] = NULL;
 908
 909 done:;
 910         if ( ctrls == NULL ) {
 911                 ctrls = op->o_ctrls;
 912         }
 913
 914         *pctrls = ctrls;
 915
 916         return rs->sr_err;
 917 }
 918 #endif /* LDAP_BACK_PROXY_AUTHZ */