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

   1 /* bind.c - decode an ldap bind operation and pass it to a backend db */
   2 /* $OpenLDAP$ */
   3 /*
   4  * Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
   5  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   6  */
   7
   8 /*
   9  * Copyright (c) 1995 Regents of the University of Michigan.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms are permitted
  13  * provided that this notice is preserved and that due credit is given
  14  * to the University of Michigan at Ann Arbor. The name of the University
  15  * may not be used to endorse or promote products derived from this
  16  * software without specific prior written permission. This software
  17  * is provided ``as is'' without express or implied warranty.
  18  */
  19
  20 #include "portable.h"
  21
  22 #include <stdio.h>
  23
  24 #include <ac/string.h>
  25 #include <ac/socket.h>
  26
  27 #include "ldap_pvt.h"
  28 #include "slap.h"
  29
  30 int
  31 do_bind(
  32     Connection  *conn,
  33     Operation   *op
  34 )
  35 {
  36         BerElement *ber = op->o_ber;
  37         ber_int_t version;
  38         ber_tag_t method;
  39         struct berval mech = { 0, NULL };
  40         struct berval dn = { 0, NULL };
  41         struct berval pdn = { 0, NULL };
  42         struct berval ndn = { 0, NULL };
  43         struct berval edn = { 0, NULL };
  44         ber_tag_t tag;
  45         int     rc = LDAP_SUCCESS;
  46         const char *text;
  47         struct berval cred = { 0, NULL };
  48         Backend *be;
  49
  50 #ifdef NEW_LOGGING
  51         LDAP_LOG( OPERATION, ENTRY, "do_bind: conn %d\n", conn->c_connid, 0, 0 );
  52 #else
  53         Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
  54 #endif
  55
  56         /*
  57          * Force to connection to "anonymous" until bind succeeds.
  58          */
  59         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
  60         connection2anonymous( conn );
  61         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
  62
  63         if ( op->o_dn.bv_val != NULL ) {
  64                 free( op->o_dn.bv_val );
  65                 op->o_dn.bv_val = ch_strdup( "" );
  66                 op->o_dn.bv_len = 0;
  67         }
  68
  69         if ( op->o_ndn.bv_val != NULL ) {
  70                 free( op->o_ndn.bv_val );
  71                 op->o_ndn.bv_val = ch_strdup( "" );
  72                 op->o_ndn.bv_len = 0;
  73         }
  74
  75         /*
  76          * Parse the bind request.  It looks like this:
  77          *
  78          *      BindRequest ::= SEQUENCE {
  79          *              version         INTEGER,                 -- version
  80          *              name            DistinguishedName,       -- dn
  81          *              authentication  CHOICE {
  82          *                      simple          [0] OCTET STRING -- passwd
  83          *                      krbv42ldap      [1] OCTET STRING
  84          *                      krbv42dsa       [2] OCTET STRING
  85          *                      SASL            [3] SaslCredentials
  86          *              }
  87          *      }
  88          *
  89          *      SaslCredentials ::= SEQUENCE {
  90      *          mechanism           LDAPString,
  91      *          credentials         OCTET STRING OPTIONAL
  92          *      }
  93          */
  94
  95         tag = ber_scanf( ber, "{imt" /*}*/, &version, &dn, &method );
  96
  97         if ( tag == LBER_ERROR ) {
  98 #ifdef NEW_LOGGING
  99                 LDAP_LOG( OPERATION, ERR,
 100                         "do_bind: conn %d  ber_scanf failed\n", conn->c_connid, 0, 0 );
 101 #else
 102                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
 103 #endif
 104                 send_ldap_disconnect( conn, op,
 105                         LDAP_PROTOCOL_ERROR, "decoding error" );
 106                 rc = -1;
 107                 goto cleanup;
 108         }
 109
 110         op->o_protocol = version;
 111
 112         if( method != LDAP_AUTH_SASL ) {
 113                 tag = ber_scanf( ber, /*{*/ "m}", &cred );
 114
 115         } else {
 116                 tag = ber_scanf( ber, "{o" /*}*/, &mech );
 117
 118                 if ( tag != LBER_ERROR ) {
 119                         ber_len_t len;
 120                         tag = ber_peek_tag( ber, &len );
 121
 122                         if ( tag == LDAP_TAG_LDAPCRED ) {
 123                                 tag = ber_scanf( ber, "m", &cred );
 124                         } else {
 125                                 tag = LDAP_TAG_LDAPCRED;
 126                                 cred.bv_val = NULL;
 127                                 cred.bv_len = 0;
 128                         }
 129
 130                         if ( tag != LBER_ERROR ) {
 131                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 132                         }
 133                 }
 134         }
 135
 136         if ( tag == LBER_ERROR ) {
 137                 send_ldap_disconnect( conn, op,
 138                         LDAP_PROTOCOL_ERROR,
 139                 "decoding error" );
 140                 rc = SLAPD_DISCONNECT;
 141                 goto cleanup;
 142         }
 143
 144         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 145 #ifdef NEW_LOGGING
 146                 LDAP_LOG( OPERATION, INFO,
 147                         "do_bind: conn %d  get_ctrls failed\n", conn->c_connid, 0, 0 );
 148 #else
 149                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 150 #endif
 151                 goto cleanup;
 152         }
 153
 154         rc = dnPrettyNormal( NULL, &dn, &pdn, &ndn );
 155         if ( rc != LDAP_SUCCESS ) {
 156 #ifdef NEW_LOGGING
 157                 LDAP_LOG( OPERATION, INFO,
 158                         "do_bind: conn %d  invalid dn (%s)\n",
 159                         conn->c_connid, dn.bv_val, 0 );
 160 #else
 161                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n",
 162                         dn.bv_val, 0, 0 );
 163 #endif
 164                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 165                     "invalid DN", NULL, NULL );
 166                 goto cleanup;
 167         }
 168
 169         if( method == LDAP_AUTH_SASL ) {
 170 #ifdef NEW_LOGGING
 171                 LDAP_LOG( OPERATION,     DETAIL1,
 172                         "do_sasl_bind: conn %d  dn (%s) mech %s\n",
 173                         conn->c_connid, pdn.bv_val, mech.bv_val );
 174 #else
 175                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 176                         pdn.bv_val, mech.bv_val, NULL );
 177 #endif
 178
 179         } else {
 180 #ifdef NEW_LOGGING
 181                 LDAP_LOG( OPERATION, DETAIL1,
 182                         "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 183                         (unsigned long) version, pdn.bv_val, (unsigned long)method );
 184 #else
 185                 Debug( LDAP_DEBUG_TRACE,
 186                         "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 187                         (unsigned long) version,
 188                         pdn.bv_val, (unsigned long) method );
 189 #endif
 190         }
 191
 192         Statslog( LDAP_DEBUG_STATS, "conn=%lu op=%lu BIND dn=\"%s\" method=%ld\n",
 193             op->o_connid, op->o_opid, pdn.bv_val, (unsigned long) method, 0 );
 194
 195         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 196 #ifdef NEW_LOGGING
 197                 LDAP_LOG( OPERATION, INFO,
 198                         "do_bind: conn %d  unknown version = %ld\n",
 199                         conn->c_connid, (unsigned long)version, 0 );
 200 #else
 201                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 202                         (unsigned long) version, 0, 0 );
 203 #endif
 204                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 205                         NULL, "requested protocol version not supported", NULL, NULL );
 206                 goto cleanup;
 207
 208         } else if (!( global_allows & SLAP_ALLOW_BIND_V2 ) &&
 209                 version < LDAP_VERSION3 )
 210         {
 211                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 212                         NULL, "requested protocol version not allowed", NULL, NULL );
 213                 goto cleanup;
 214         }
 215
 216         /* we set connection version regardless of whether bind succeeds
 217          * or not.
 218          */
 219         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 220         conn->c_protocol = version;
 221         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 222
 223         /* check for inappropriate controls */
 224         if( get_manageDSAit( op ) == SLAP_CRITICAL_CONTROL ) {
 225                 send_ldap_result( conn, op,
 226                         rc = LDAP_UNAVAILABLE_CRITICAL_EXTENSION,
 227                         NULL, "manageDSAit control inappropriate",
 228                         NULL, NULL );
 229                 goto cleanup;
 230         }
 231
 232         if ( method == LDAP_AUTH_SASL ) {
 233                 slap_ssf_t ssf = 0;
 234
 235                 if ( version < LDAP_VERSION3 ) {
 236 #ifdef NEW_LOGGING
 237                         LDAP_LOG( OPERATION, INFO,
 238                                 "do_bind: conn %d  sasl with LDAPv%ld\n",
 239                                 conn->c_connid, (unsigned long)version , 0 );
 240 #else
 241                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 242                                 (unsigned long) version, 0, 0 );
 243 #endif
 244                         send_ldap_disconnect( conn, op,
 245                                 LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
 246                         rc = SLAPD_DISCONNECT;
 247                         goto cleanup;
 248                 }
 249
 250                 if( mech.bv_len == 0 ) {
 251 #ifdef NEW_LOGGING
 252                         LDAP_LOG( OPERATION, INFO,
 253                                    "do_bind: conn %d  no SASL mechanism provided\n",
 254                                    conn->c_connid, 0, 0 );
 255 #else
 256                         Debug( LDAP_DEBUG_ANY,
 257                                 "do_bind: no sasl mechanism provided\n",
 258                                 0, 0, 0 );
 259 #endif
 260                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 261                                 NULL, "no SASL mechanism provided", NULL, NULL );
 262                         goto cleanup;
 263                 }
 264
 265                 /* check restrictions */
 266                 rc = backend_check_restrictions( NULL, conn, op, &mech, &text );
 267                 if( rc != LDAP_SUCCESS ) {
 268                         send_ldap_result( conn, op, rc,
 269                                 NULL, text, NULL, NULL );
 270                         goto cleanup;
 271                 }
 272
 273                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 274                 if ( conn->c_sasl_bind_in_progress ) {
 275                         if((ber_bvcmp(&conn->c_sasl_bind_mech, &mech) != 0)) {
 276                                 /* mechanism changed between bind steps */
 277                                 slap_sasl_reset(conn);
 278                         }
 279                 } else {
 280                         conn->c_sasl_bind_mech = mech;
 281                         mech.bv_val = NULL;
 282                         mech.bv_len = 0;
 283                 }
 284                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 285
 286                 rc = slap_sasl_bind( conn, op,
 287                         &pdn, &ndn,
 288                         &cred, &edn, &ssf );
 289
 290                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 291                 if( rc == LDAP_SUCCESS ) {
 292                         conn->c_dn = edn;
 293                         if( edn.bv_len != 0 ) {
 294                                 /* edn is always normalized already */
 295                                 ber_dupbv( &conn->c_ndn, &conn->c_dn );
 296                         }
 297                         conn->c_authmech = conn->c_sasl_bind_mech;
 298                         conn->c_sasl_bind_mech.bv_val = NULL;
 299                         conn->c_sasl_bind_mech.bv_len = 0;
 300                         conn->c_sasl_bind_in_progress = 0;
 301
 302                         conn->c_sasl_ssf = ssf;
 303                         if( ssf > conn->c_ssf ) {
 304                                 conn->c_ssf = ssf;
 305                         }
 306
 307                         if( conn->c_dn.bv_len != 0 ) {
 308                                 ber_len_t max = sockbuf_max_incoming;
 309                                 ber_sockbuf_ctrl( conn->c_sb,
 310                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
 311                         }
 312
 313                 } else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 314                         conn->c_sasl_bind_in_progress = 1;
 315
 316                 } else {
 317                         if ( conn->c_sasl_bind_mech.bv_val ) {
 318                                 free( conn->c_sasl_bind_mech.bv_val );
 319                                 conn->c_sasl_bind_mech.bv_val = NULL;
 320                                 conn->c_sasl_bind_mech.bv_len = 0;
 321                         }
 322                         conn->c_sasl_bind_in_progress = 0;
 323                 }
 324                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 325
 326                 goto cleanup;
 327
 328         } else {
 329                 /* Not SASL, cancel any in-progress bind */
 330                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 331
 332                 if ( conn->c_sasl_bind_mech.bv_val != NULL ) {
 333                         free(conn->c_sasl_bind_mech.bv_val);
 334                         conn->c_sasl_bind_mech.bv_val = NULL;
 335                         conn->c_sasl_bind_mech.bv_len = 0;
 336                 }
 337                 conn->c_sasl_bind_in_progress = 0;
 338
 339                 slap_sasl_reset( conn );
 340                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 341         }
 342
 343         if ( method == LDAP_AUTH_SIMPLE ) {
 344                 /* accept "anonymous" binds */
 345                 if ( cred.bv_len == 0 || ndn.bv_len == 0 ) {
 346                         rc = LDAP_SUCCESS;
 347                         text = NULL;
 348
 349                         if( cred.bv_len &&
 350                                 !( global_allows & SLAP_ALLOW_BIND_ANON_CRED ))
 351                         {
 352                                 /* cred is not empty, disallow */
 353                                 rc = LDAP_INVALID_CREDENTIALS;
 354
 355                         } else if ( ndn.bv_len &&
 356                                 !( global_allows & SLAP_ALLOW_BIND_ANON_DN ))
 357                         {
 358                                 /* DN is not empty, disallow */
 359                                 rc = LDAP_UNWILLING_TO_PERFORM;
 360                                 text = "unwilling to allow anonymous bind with non-empty DN";
 361
 362                         } else if ( global_disallows & SLAP_DISALLOW_BIND_ANON ) {
 363                                 /* disallow */
 364                                 rc = LDAP_INAPPROPRIATE_AUTH;
 365                                 text = "anonymous bind disallowed";
 366
 367                         } else {
 368                                 rc = backend_check_restrictions( NULL, conn, op,
 369                                         &mech, &text );
 370                         }
 371
 372                         /*
 373                          * we already forced connection to "anonymous",
 374                          * just need to send success
 375                          */
 376                         send_ldap_result( conn, op, rc,
 377                                 NULL, text, NULL, NULL );
 378 #ifdef NEW_LOGGING
 379                         LDAP_LOG( OPERATION, DETAIL1,
 380                                    "do_bind: conn %d  v%d anonymous bind\n",
 381                                    conn->c_connid, version , 0 );
 382 #else
 383                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
 384                                 version, 0, 0 );
 385 #endif
 386                         goto cleanup;
 387
 388                 } else if ( global_disallows & SLAP_DISALLOW_BIND_SIMPLE ) {
 389                         /* disallow simple authentication */
 390                         rc = LDAP_UNWILLING_TO_PERFORM;
 391                         text = "unwilling to perform simple authentication";
 392
 393                         send_ldap_result( conn, op, rc,
 394                                 NULL, text, NULL, NULL );
 395 #ifdef NEW_LOGGING
 396                         LDAP_LOG( OPERATION, INFO,
 397                                    "do_bind: conn %d  v%d simple bind(%s) disallowed\n",
 398                                    conn->c_connid, version, ndn.bv_val );
 399 #else
 400                         Debug( LDAP_DEBUG_TRACE,
 401                                 "do_bind: v%d simple bind(%s) disallowed\n",
 402                                 version, ndn.bv_val, 0 );
 403 #endif
 404                         goto cleanup;
 405
 406                 } else if (( global_disallows & SLAP_DISALLOW_BIND_SIMPLE_UNPROTECTED )
 407                         && ( op->o_ssf < global_ssf_set.sss_ssf ))
 408                 {
 409                         rc = LDAP_CONFIDENTIALITY_REQUIRED;
 410                         text = "unwilling to perform simple authentication "
 411                                 "without confidentilty protection";
 412
 413                         send_ldap_result( conn, op, rc,
 414                                 NULL, text, NULL, NULL );
 415
 416 #ifdef NEW_LOGGING
 417                         LDAP_LOG( OPERATION, INFO, "do_bind: conn %d  "
 418                                 "v%d unprotected simple bind(%s) disallowed\n",
 419                                 conn->c_connid, version, ndn.bv_val );
 420 #else
 421                         Debug( LDAP_DEBUG_TRACE,
 422                                 "do_bind: v%d unprotected simple bind(%s) disallowed\n",
 423                                 version, ndn.bv_val, 0 );
 424 #endif
 425                         goto cleanup;
 426                 }
 427
 428 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 429         } else if ( method == LDAP_AUTH_KRBV41 || method == LDAP_AUTH_KRBV42 ) {
 430                 if ( global_disallows & SLAP_DISALLOW_BIND_KRBV4 ) {
 431                         /* disallow simple authentication */
 432                         rc = LDAP_UNWILLING_TO_PERFORM;
 433                         text = "unwilling to perform Kerberos V4 bind";
 434
 435                         send_ldap_result( conn, op, rc,
 436                                 NULL, text, NULL, NULL );
 437 #ifdef NEW_LOGGING
 438                         LDAP_LOG( OPERATION, DETAIL1,
 439                                    "do_bind: conn %d  v%d Kerberos V4 bind\n",
 440                                    conn->c_connid, version , 0 );
 441 #else
 442                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d Kerberos V4 bind\n",
 443                                 version, 0, 0 );
 444 #endif
 445                         goto cleanup;
 446                 }
 447 #endif
 448
 449         } else {
 450                 rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 451                 text = "unknown authentication method";
 452
 453                 send_ldap_result( conn, op, rc,
 454                         NULL, text, NULL, NULL );
 455 #ifdef NEW_LOGGING
 456                 LDAP_LOG( OPERATION, INFO,
 457                            "do_bind: conn %ld  v%d unknown authentication method (%ld)\n",
 458                            conn->c_connid, version, method );
 459 #else
 460                 Debug( LDAP_DEBUG_TRACE,
 461                         "do_bind: v%d unknown authentication method (%ld)\n",
 462                         version, method, 0 );
 463 #endif
 464                 goto cleanup;
 465         }
 466
 467         /*
 468          * We could be serving multiple database backends.  Select the
 469          * appropriate one, or send a referral to our "referral server"
 470          * if we don't hold it.
 471          */
 472
 473         if ( (be = select_backend( &ndn, 0, 0 )) == NULL ) {
 474                 if ( default_referral ) {
 475                         BerVarray ref = referral_rewrite( default_referral,
 476                                 NULL, &pdn, LDAP_SCOPE_DEFAULT );
 477
 478                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 479                                 NULL, NULL, ref ? ref : default_referral, NULL );
 480
 481                         ber_bvarray_free( ref );
 482
 483                 } else {
 484                         /* noSuchObject is not allowed to be returned by bind */
 485                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 486                                 NULL, NULL, NULL, NULL );
 487                 }
 488
 489                 goto cleanup;
 490         }
 491
 492         /* check restrictions */
 493         rc = backend_check_restrictions( be, conn, op, NULL, &text );
 494         if( rc != LDAP_SUCCESS ) {
 495                 send_ldap_result( conn, op, rc,
 496                         NULL, text, NULL, NULL );
 497                 goto cleanup;
 498         }
 499
 500         if ( be->be_bind ) {
 501                 int ret;
 502
 503                 /* deref suffix alias if appropriate */
 504                 suffix_alias( be, &ndn );
 505
 506                 ret = (*be->be_bind)( be, conn, op,
 507                         &pdn, &ndn, method, &cred, &edn );
 508
 509                 if ( ret == 0 ) {
 510                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 511
 512                         if( conn->c_authz_backend == NULL ) {
 513                                 conn->c_authz_backend = be;
 514                         }
 515
 516                         if(edn.bv_len) {
 517                                 conn->c_dn = edn;
 518                         } else {
 519                                 conn->c_dn = pdn;
 520                                 pdn.bv_val = NULL;
 521                                 pdn.bv_len = 0;
 522                         }
 523
 524                         conn->c_ndn = ndn;
 525                         ndn.bv_val = NULL;
 526                         ndn.bv_len = 0;
 527
 528                         if( conn->c_dn.bv_len != 0 ) {
 529                                 ber_len_t max = sockbuf_max_incoming;
 530                                 ber_sockbuf_ctrl( conn->c_sb,
 531                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
 532                         }
 533
 534 #ifdef NEW_LOGGING
 535                         LDAP_LOG( OPERATION, DETAIL1,
 536                                 "do_bind: v%d bind: \"%s\" to \"%s\" \n",
 537                                 version, conn->c_dn.bv_val, conn->c_dn.bv_val );
 538 #else
 539                         Debug( LDAP_DEBUG_TRACE,
 540                                 "do_bind: v%d bind: \"%s\" to \"%s\"\n",
 541                                 version, dn.bv_val, conn->c_dn.bv_val );
 542 #endif
 543
 544                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 545
 546                         /* send this here to avoid a race condition */
 547                         send_ldap_result( conn, op, LDAP_SUCCESS,
 548                                 NULL, NULL, NULL, NULL );
 549
 550                 } else if (edn.bv_val != NULL) {
 551                         free( edn.bv_val );
 552                 }
 553
 554         } else {
 555                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 556                         NULL, "operation not supported within namingContext",
 557                         NULL, NULL );
 558         }
 559
 560 cleanup:
 561         if( pdn.bv_val != NULL ) {
 562                 free( pdn.bv_val );
 563         }
 564         if( ndn.bv_val != NULL ) {
 565                 free( ndn.bv_val );
 566         }
 567         if ( mech.bv_val != NULL ) {
 568                 free( mech.bv_val );
 569         }
 570
 571         return rc;
 572 }