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 291                  * FIXME: the o_conn might be no longer valid,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