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 1998-2000 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         char *mech = NULL;
  40         struct berval dn = { 0, NULL };
  41         struct berval *pdn = NULL;
  42         struct berval *ndn = NULL;
  43         ber_tag_t tag;
  44         int     rc = LDAP_SUCCESS;
  45         const char *text;
  46         struct berval cred = { 0, NULL };
  47         Backend *be;
  48
  49 #ifdef NEW_LOGGING
  50         LDAP_LOG(( "operation", LDAP_LEVEL_ENTRY,
  51                 "do_bind: conn %d\n", conn->c_connid ));
  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, "{iot" /*}*/, &version, &dn, &method );
  96
  97         if ( tag == LBER_ERROR ) {
  98 #ifdef NEW_LOGGING
  99                 LDAP_LOG(( "operation", LDAP_LEVEL_ERR,
 100                         "do_bind: conn %d  ber_scanf failed\n", conn->c_connid ));
 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, /*{*/ "o}", &cred );
 114
 115         } else {
 116                 tag = ber_scanf( ber, "{a" /*}*/, &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, "o", &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", LDAP_LEVEL_INFO,
 147                         "do_bind: conn %d  get_ctrls failed\n", conn->c_connid ));
 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 = dnPretty( NULL, &dn, &pdn );
 155         if ( rc != LDAP_SUCCESS ) {
 156 #ifdef NEW_LOGGING
 157                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 158                         "do_bind: conn %d  invalid dn (%s)\n",
 159                         conn->c_connid, dn.bv_val ));
 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         rc = dnNormalize( NULL, &dn, &ndn );
 170         if ( rc != LDAP_SUCCESS ) {
 171 #ifdef NEW_LOGGING
 172                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 173                         "do_bind: conn %d  invalid dn (%s)\n",
 174                         conn->c_connid, dn.bv_val ));
 175 #else
 176                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n",
 177                         dn.bv_val, 0, 0 );
 178 #endif
 179                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 180                     "invalid DN", NULL, NULL );
 181                 goto cleanup;
 182         }
 183
 184         if( method == LDAP_AUTH_SASL ) {
 185 #ifdef NEW_LOGGING
 186                 LDAP_LOG(( "operation",  LDAP_LEVEL_DETAIL1,
 187                         "do_sasl_bind: conn %d  dn (%s) mech %s\n", conn->c_connid,
 188                         pdn->bv_val, mech ));
 189 #else
 190                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 191                         pdn->bv_val, mech, NULL );
 192 #endif
 193
 194         } else {
 195 #ifdef NEW_LOGGING
 196                 LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 197                         "do_bind: conn %d  version=%ld dn=\"%s\" method=%ld\n",
 198                         conn->c_connid, (unsigned long) version,
 199                         pdn->bv_val, (unsigned long)method ));
 200 #else
 201                 Debug( LDAP_DEBUG_TRACE,
 202                         "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 203                         (unsigned long) version,
 204                         pdn->bv_val, (unsigned long) method );
 205 #endif
 206         }
 207
 208         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 209             op->o_connid, op->o_opid, pdn->bv_val, (unsigned long) method, 0 );
 210
 211         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 212 #ifdef NEW_LOGGING
 213                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 214                         "do_bind: conn %d  unknown version = %ld\n",
 215                         conn->c_connid, (unsigned long)version ));
 216 #else
 217                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 218                         (unsigned long) version, 0, 0 );
 219 #endif
 220                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 221                         NULL, "requested protocol version not supported", NULL, NULL );
 222                 goto cleanup;
 223
 224         } else if (!( global_allows & SLAP_ALLOW_BIND_V2 ) &&
 225                 version < LDAP_VERSION3 )
 226         {
 227                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 228                         NULL, "requested protocol version not allowed", NULL, NULL );
 229                 goto cleanup;
 230         }
 231
 232         /* we set connection version regardless of whether bind succeeds
 233          * or not.
 234          */
 235         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 236         conn->c_protocol = version;
 237         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 238
 239         if ( method == LDAP_AUTH_SASL ) {
 240                 char *edn;
 241                 slap_ssf_t ssf = 0;
 242
 243                 if ( version < LDAP_VERSION3 ) {
 244 #ifdef NEW_LOGGING
 245                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 246                                 "do_bind: conn %d  sasl with LDAPv%ld\n",
 247                                 conn->c_connid, (unsigned long)version ));
 248 #else
 249                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 250                                 (unsigned long) version, 0, 0 );
 251 #endif
 252                         send_ldap_disconnect( conn, op,
 253                                 LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
 254                         rc = SLAPD_DISCONNECT;
 255                         goto cleanup;
 256                 }
 257
 258                 if( mech == NULL || *mech == '\0' ) {
 259 #ifdef NEW_LOGGING
 260                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 261                                    "do_bind: conn %d  no SASL mechanism provided\n",
 262                                    conn->c_connid ));
 263 #else
 264                         Debug( LDAP_DEBUG_ANY,
 265                                 "do_bind: no sasl mechanism provided\n",
 266                                 0, 0, 0 );
 267 #endif
 268                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 269                                 NULL, "no SASL mechanism provided", NULL, NULL );
 270                         goto cleanup;
 271                 }
 272
 273                 /* check restrictions */
 274                 rc = backend_check_restrictions( NULL, conn, op, mech, &text );
 275                 if( rc != LDAP_SUCCESS ) {
 276                         send_ldap_result( conn, op, rc,
 277                                 NULL, text, NULL, NULL );
 278                         goto cleanup;
 279                 }
 280
 281                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 282                 if ( conn->c_sasl_bind_in_progress ) {
 283                         if((strcmp(conn->c_sasl_bind_mech, mech) != 0)) {
 284                                 /* mechanism changed between bind steps */
 285                                 slap_sasl_reset(conn);
 286                         }
 287                 } else {
 288                         conn->c_sasl_bind_mech = mech;
 289                         mech = NULL;
 290                 }
 291                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 292
 293                 edn = NULL;
 294                 rc = slap_sasl_bind( conn, op,
 295                         pdn->bv_val, ndn->bv_val,
 296                         &cred, &edn, &ssf );
 297
 298                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 299                 if( rc == LDAP_SUCCESS ) {
 300                         conn->c_dn.bv_val = edn;
 301                         if( edn != NULL ) {
 302                                 struct berval *cndn;
 303                                 conn->c_dn.bv_len = strlen( edn );
 304                                 dnNormalize( NULL, &conn->c_dn, &cndn );
 305                                 conn->c_ndn = *cndn;
 306                                 free( cndn );
 307                         }
 308                         conn->c_authmech = conn->c_sasl_bind_mech;
 309                         conn->c_sasl_bind_mech = NULL;
 310                         conn->c_sasl_bind_in_progress = 0;
 311
 312                         conn->c_sasl_ssf = ssf;
 313                         if( ssf > conn->c_ssf ) {
 314                                 conn->c_ssf = ssf;
 315                         }
 316
 317                         if( conn->c_dn.bv_len != 0 ) {
 318                                 ber_len_t max = sockbuf_max_incoming;
 319                                 ber_sockbuf_ctrl( conn->c_sb,
 320                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
 321                         }
 322
 323                 } else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 324                         conn->c_sasl_bind_in_progress = 1;
 325
 326                 } else {
 327                         if ( conn->c_sasl_bind_mech ) {
 328                                 free( conn->c_sasl_bind_mech );
 329                                 conn->c_sasl_bind_mech = NULL;
 330                         }
 331                         conn->c_sasl_bind_in_progress = 0;
 332                 }
 333                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 334
 335                 goto cleanup;
 336
 337         } else {
 338                 /* Not SASL, cancel any in-progress bind */
 339                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 340
 341                 if ( conn->c_sasl_bind_mech != NULL ) {
 342                         free(conn->c_sasl_bind_mech);
 343                         conn->c_sasl_bind_mech = NULL;
 344                 }
 345                 conn->c_sasl_bind_in_progress = 0;
 346
 347                 slap_sasl_reset( conn );
 348                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 349         }
 350
 351         if ( method == LDAP_AUTH_SIMPLE ) {
 352                 /* accept "anonymous" binds */
 353                 if ( cred.bv_len == 0 || ndn->bv_len == 0 ) {
 354                         rc = LDAP_SUCCESS;
 355                         text = NULL;
 356
 357                         if( cred.bv_len &&
 358                                 !( global_allows & SLAP_ALLOW_BIND_ANON_CRED ))
 359                         {
 360                                 /* cred is not empty, disallow */
 361                                 rc = LDAP_INVALID_CREDENTIALS;
 362
 363                         } else if ( ndn->bv_len &&
 364                                 !( global_allows & SLAP_ALLOW_BIND_ANON_DN ))
 365                         {
 366                                 /* DN is not empty, disallow */
 367                                 rc = LDAP_UNWILLING_TO_PERFORM;
 368                                 text = "unwilling to allow anonymous bind with non-empty DN";
 369
 370                         } else if ( global_disallows & SLAP_DISALLOW_BIND_ANON ) {
 371                                 /* disallow */
 372                                 rc = LDAP_INAPPROPRIATE_AUTH;
 373                                 text = "anonymous bind disallowed";
 374
 375                         } else {
 376                                 rc = backend_check_restrictions( NULL, conn, op, mech, &text );
 377                         }
 378
 379                         /*
 380                          * we already forced connection to "anonymous",
 381                          * just need to send success
 382                          */
 383                         send_ldap_result( conn, op, rc,
 384                                 NULL, text, NULL, NULL );
 385 #ifdef NEW_LOGGING
 386                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 387                                    "do_bind: conn %d  v%d anonymous bind\n",
 388                                    conn->c_connid, version ));
 389 #else
 390                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
 391                                 version, 0, 0 );
 392 #endif
 393                         goto cleanup;
 394
 395                 } else if ( global_disallows & SLAP_DISALLOW_BIND_SIMPLE ) {
 396                         /* disallow simple authentication */
 397                         rc = LDAP_UNWILLING_TO_PERFORM;
 398                         text = "unwilling to perform simple authentication";
 399
 400                         send_ldap_result( conn, op, rc,
 401                                 NULL, text, NULL, NULL );
 402 #ifdef NEW_LOGGING
 403                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 404                                    "do_bind: conn %d  v%d simple bind(%s) disallowed\n",
 405                                    conn->c_connid, version, ndn ));
 406 #else
 407                         Debug( LDAP_DEBUG_TRACE,
 408                                 "do_bind: v%d simple bind(%s) disallowed\n",
 409                                 version, ndn, 0 );
 410 #endif
 411                         goto cleanup;
 412                 }
 413
 414 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 415         } else if ( method == LDAP_AUTH_KRBV41 || method == LDAP_AUTH_KRBV42 ) {
 416                 if ( global_disallows & SLAP_DISALLOW_BIND_KRBV4 ) {
 417                         /* disallow simple authentication */
 418                         rc = LDAP_UNWILLING_TO_PERFORM;
 419                         text = "unwilling to perform Kerberos V4 bind";
 420
 421                         send_ldap_result( conn, op, rc,
 422                                 NULL, text, NULL, NULL );
 423 #ifdef NEW_LOGGING
 424                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 425                                    "do_bind: conn %d  v%d Kerberos V4 bind\n",
 426                                    conn->c_connid, version ));
 427 #else
 428                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d Kerberos V4 bind\n",
 429                                 version, 0, 0 );
 430 #endif
 431                         goto cleanup;
 432                 }
 433 #endif
 434
 435         } else {
 436                 rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 437                 text = "unknown authentication method";
 438
 439                 send_ldap_result( conn, op, rc,
 440                         NULL, text, NULL, NULL );
 441 #ifdef NEW_LOGGING
 442                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 443                            "do_bind: conn %ld  v%d unknown authentication method (%ld)\n",
 444                            conn->c_connid, version, method ));
 445 #else
 446                 Debug( LDAP_DEBUG_TRACE,
 447                         "do_bind: v%d unknown authentication method (%ld)\n",
 448                         version, method, 0 );
 449 #endif
 450                 goto cleanup;
 451         }
 452
 453         /*
 454          * We could be serving multiple database backends.  Select the
 455          * appropriate one, or send a referral to our "referral server"
 456          * if we don't hold it.
 457          */
 458
 459         if ( (be = select_backend( ndn, 0, 0 )) == NULL ) {
 460                 if ( default_referral ) {
 461                         struct berval **ref = referral_rewrite( default_referral,
 462                                 NULL, pdn, LDAP_SCOPE_DEFAULT );
 463
 464                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 465                                 NULL, NULL, ref ? ref : default_referral, NULL );
 466
 467                         ber_bvecfree( ref );
 468
 469                 } else {
 470                         /* noSuchObject is not allowed to be returned by bind */
 471                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 472                                 NULL, NULL, NULL, NULL );
 473                 }
 474
 475                 goto cleanup;
 476         }
 477
 478         /* check restrictions */
 479         rc = backend_check_restrictions( be, conn, op, NULL, &text );
 480         if( rc != LDAP_SUCCESS ) {
 481                 send_ldap_result( conn, op, rc,
 482                         NULL, text, NULL, NULL );
 483                 goto cleanup;
 484         }
 485
 486         conn->c_authz_backend = be;
 487
 488         if ( be->be_bind ) {
 489                 int ret;
 490                 /* alias suffix */
 491                 struct berval edn = { 0, NULL };
 492
 493                 /* deref suffix alias if appropriate */
 494                 suffix_alias( be, ndn );
 495
 496                 ret = (*be->be_bind)( be, conn, op,
 497                         pdn, ndn, method, &cred, &edn );
 498
 499                 if ( ret == 0 ) {
 500                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 501
 502                         if(edn.bv_len) {
 503                                 conn->c_dn = edn;
 504                         } else {
 505                                 conn->c_dn.bv_val = ch_strdup( pdn->bv_val );
 506                                 conn->c_dn.bv_len = pdn->bv_len;
 507                         }
 508                         conn->c_cdn = pdn->bv_val;
 509                         pdn->bv_val = NULL;
 510                         pdn->bv_len = 0;
 511
 512                         conn->c_ndn = *ndn;
 513                         ndn->bv_val = NULL;
 514                         ndn->bv_len = 0;
 515
 516                         if( conn->c_dn.bv_len != 0 ) {
 517                                 ber_len_t max = sockbuf_max_incoming;
 518                                 ber_sockbuf_ctrl( conn->c_sb,
 519                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
 520                         }
 521
 522 #ifdef NEW_LOGGING
 523                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 524                                 "do_bind: conn %d  v%d bind: \"%s\" to \"%s\" \n",
 525                                 conn->c_connid, version, conn->c_cdn, conn->c_dn.bv_val ));
 526 #else
 527                         Debug( LDAP_DEBUG_TRACE,
 528                                 "do_bind: v%d bind: \"%s\" to \"%s\"\n",
 529                                 version, conn->c_cdn, conn->c_dn.bv_val );
 530 #endif
 531
 532                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 533
 534                         /* send this here to avoid a race condition */
 535                         send_ldap_result( conn, op, LDAP_SUCCESS,
 536                                 NULL, NULL, NULL, NULL );
 537
 538                 } else if (edn.bv_val != NULL) {
 539                         free( edn.bv_val );
 540                 }
 541
 542         } else {
 543                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 544                         NULL, "operation not supported within namingContext",
 545                         NULL, NULL );
 546         }
 547
 548 cleanup:
 549         free( dn.bv_val );
 550         if( pdn != NULL ) {
 551                 ber_bvfree( pdn );
 552         }
 553         if( ndn != NULL ) {
 554                 ber_bvfree( ndn );
 555         }
 556         if ( mech != NULL ) {
 557                 free( mech );
 558         }
 559         if ( cred.bv_val != NULL ) {
 560                 free( cred.bv_val );
 561         }
 562
 563         return rc;
 564 }