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         char *mech = NULL;
  40         struct berval dn = { 0, NULL };
  41         struct berval pdn = { 0, NULL };
  42         struct berval ndn = { 0, 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 = dnPrettyNormal( NULL, &dn, &pdn, &ndn );
 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         if( method == LDAP_AUTH_SASL ) {
 170 #ifdef NEW_LOGGING
 171                 LDAP_LOG(( "operation",  LDAP_LEVEL_DETAIL1,
 172                         "do_sasl_bind: conn %d  dn (%s) mech %s\n", conn->c_connid,
 173                         pdn.bv_val, mech ));
 174 #else
 175                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 176                         pdn.bv_val, mech, NULL );
 177 #endif
 178
 179         } else {
 180 #ifdef NEW_LOGGING
 181                 LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 182                         "do_bind: conn %d  version=%ld dn=\"%s\" method=%ld\n",
 183                         conn->c_connid, (unsigned long) version,
 184                         pdn.bv_val, (unsigned long)method ));
 185 #else
 186                 Debug( LDAP_DEBUG_TRACE,
 187                         "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 188                         (unsigned long) version,
 189                         pdn.bv_val, (unsigned long) method );
 190 #endif
 191         }
 192
 193         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 194             op->o_connid, op->o_opid, pdn.bv_val, (unsigned long) method, 0 );
 195
 196         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 197 #ifdef NEW_LOGGING
 198                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 199                         "do_bind: conn %d  unknown version = %ld\n",
 200                         conn->c_connid, (unsigned long)version ));
 201 #else
 202                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 203                         (unsigned long) version, 0, 0 );
 204 #endif
 205                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 206                         NULL, "requested protocol version not supported", NULL, NULL );
 207                 goto cleanup;
 208
 209         } else if (!( global_allows & SLAP_ALLOW_BIND_V2 ) &&
 210                 version < LDAP_VERSION3 )
 211         {
 212                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 213                         NULL, "requested protocol version not allowed", NULL, NULL );
 214                 goto cleanup;
 215         }
 216
 217         /* we set connection version regardless of whether bind succeeds
 218          * or not.
 219          */
 220         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 221         conn->c_protocol = version;
 222         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 223
 224         if ( method == LDAP_AUTH_SASL ) {
 225                 char *edn;
 226                 slap_ssf_t ssf = 0;
 227
 228                 if ( version < LDAP_VERSION3 ) {
 229 #ifdef NEW_LOGGING
 230                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 231                                 "do_bind: conn %d  sasl with LDAPv%ld\n",
 232                                 conn->c_connid, (unsigned long)version ));
 233 #else
 234                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 235                                 (unsigned long) version, 0, 0 );
 236 #endif
 237                         send_ldap_disconnect( conn, op,
 238                                 LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
 239                         rc = SLAPD_DISCONNECT;
 240                         goto cleanup;
 241                 }
 242
 243                 if( mech == NULL || *mech == '\0' ) {
 244 #ifdef NEW_LOGGING
 245                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 246                                    "do_bind: conn %d  no SASL mechanism provided\n",
 247                                    conn->c_connid ));
 248 #else
 249                         Debug( LDAP_DEBUG_ANY,
 250                                 "do_bind: no sasl mechanism provided\n",
 251                                 0, 0, 0 );
 252 #endif
 253                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 254                                 NULL, "no SASL mechanism provided", NULL, NULL );
 255                         goto cleanup;
 256                 }
 257
 258                 /* check restrictions */
 259                 rc = backend_check_restrictions( NULL, conn, op, mech, &text );
 260                 if( rc != LDAP_SUCCESS ) {
 261                         send_ldap_result( conn, op, rc,
 262                                 NULL, text, NULL, NULL );
 263                         goto cleanup;
 264                 }
 265
 266                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 267                 if ( conn->c_sasl_bind_in_progress ) {
 268                         if((strcmp(conn->c_sasl_bind_mech, mech) != 0)) {
 269                                 /* mechanism changed between bind steps */
 270                                 slap_sasl_reset(conn);
 271                         }
 272                 } else {
 273                         conn->c_sasl_bind_mech = mech;
 274                         mech = NULL;
 275                 }
 276                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 277
 278                 edn = NULL;
 279                 rc = slap_sasl_bind( conn, op,
 280                         &pdn, &ndn,
 281                         &cred, &edn, &ssf );
 282
 283                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 284                 if( rc == LDAP_SUCCESS ) {
 285                         conn->c_dn.bv_val = edn;
 286                         if( edn != NULL ) {
 287                                 conn->c_dn.bv_len = strlen( edn );
 288                                 dnNormalize2( NULL, &conn->c_dn, &conn->c_ndn );
 289                         }
 290                         conn->c_authmech = conn->c_sasl_bind_mech;
 291                         conn->c_sasl_bind_mech = NULL;
 292                         conn->c_sasl_bind_in_progress = 0;
 293
 294                         conn->c_sasl_ssf = ssf;
 295                         if( ssf > conn->c_ssf ) {
 296                                 conn->c_ssf = ssf;
 297                         }
 298
 299                         if( conn->c_dn.bv_len != 0 ) {
 300                                 ber_len_t max = sockbuf_max_incoming;
 301                                 ber_sockbuf_ctrl( conn->c_sb,
 302                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
 303                         }
 304
 305                 } else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 306                         conn->c_sasl_bind_in_progress = 1;
 307
 308                 } else {
 309                         if ( conn->c_sasl_bind_mech ) {
 310                                 free( conn->c_sasl_bind_mech );
 311                                 conn->c_sasl_bind_mech = NULL;
 312                         }
 313                         conn->c_sasl_bind_in_progress = 0;
 314                 }
 315                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 316
 317                 goto cleanup;
 318
 319         } else {
 320                 /* Not SASL, cancel any in-progress bind */
 321                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 322
 323                 if ( conn->c_sasl_bind_mech != NULL ) {
 324                         free(conn->c_sasl_bind_mech);
 325                         conn->c_sasl_bind_mech = NULL;
 326                 }
 327                 conn->c_sasl_bind_in_progress = 0;
 328
 329                 slap_sasl_reset( conn );
 330                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 331         }
 332
 333         if ( method == LDAP_AUTH_SIMPLE ) {
 334                 /* accept "anonymous" binds */
 335                 if ( cred.bv_len == 0 || ndn.bv_len == 0 ) {
 336                         rc = LDAP_SUCCESS;
 337                         text = NULL;
 338
 339                         if( cred.bv_len &&
 340                                 !( global_allows & SLAP_ALLOW_BIND_ANON_CRED ))
 341                         {
 342                                 /* cred is not empty, disallow */
 343                                 rc = LDAP_INVALID_CREDENTIALS;
 344
 345                         } else if ( ndn.bv_len &&
 346                                 !( global_allows & SLAP_ALLOW_BIND_ANON_DN ))
 347                         {
 348                                 /* DN is not empty, disallow */
 349                                 rc = LDAP_UNWILLING_TO_PERFORM;
 350                                 text = "unwilling to allow anonymous bind with non-empty DN";
 351
 352                         } else if ( global_disallows & SLAP_DISALLOW_BIND_ANON ) {
 353                                 /* disallow */
 354                                 rc = LDAP_INAPPROPRIATE_AUTH;
 355                                 text = "anonymous bind disallowed";
 356
 357                         } else {
 358                                 rc = backend_check_restrictions( NULL, conn, op, mech, &text );
 359                         }
 360
 361                         /*
 362                          * we already forced connection to "anonymous",
 363                          * just need to send success
 364                          */
 365                         send_ldap_result( conn, op, rc,
 366                                 NULL, text, NULL, NULL );
 367 #ifdef NEW_LOGGING
 368                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 369                                    "do_bind: conn %d  v%d anonymous bind\n",
 370                                    conn->c_connid, version ));
 371 #else
 372                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
 373                                 version, 0, 0 );
 374 #endif
 375                         goto cleanup;
 376
 377                 } else if ( global_disallows & SLAP_DISALLOW_BIND_SIMPLE ) {
 378                         /* disallow simple authentication */
 379                         rc = LDAP_UNWILLING_TO_PERFORM;
 380                         text = "unwilling to perform simple authentication";
 381
 382                         send_ldap_result( conn, op, rc,
 383                                 NULL, text, NULL, NULL );
 384 #ifdef NEW_LOGGING
 385                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 386                                    "do_bind: conn %d  v%d simple bind(%s) disallowed\n",
 387                                    conn->c_connid, version, ndn.bv_val ));
 388 #else
 389                         Debug( LDAP_DEBUG_TRACE,
 390                                 "do_bind: v%d simple bind(%s) disallowed\n",
 391                                 version, ndn.bv_val, 0 );
 392 #endif
 393                         goto cleanup;
 394                 }
 395
 396 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 397         } else if ( method == LDAP_AUTH_KRBV41 || method == LDAP_AUTH_KRBV42 ) {
 398                 if ( global_disallows & SLAP_DISALLOW_BIND_KRBV4 ) {
 399                         /* disallow simple authentication */
 400                         rc = LDAP_UNWILLING_TO_PERFORM;
 401                         text = "unwilling to perform Kerberos V4 bind";
 402
 403                         send_ldap_result( conn, op, rc,
 404                                 NULL, text, NULL, NULL );
 405 #ifdef NEW_LOGGING
 406                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 407                                    "do_bind: conn %d  v%d Kerberos V4 bind\n",
 408                                    conn->c_connid, version ));
 409 #else
 410                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d Kerberos V4 bind\n",
 411                                 version, 0, 0 );
 412 #endif
 413                         goto cleanup;
 414                 }
 415 #endif
 416
 417         } else {
 418                 rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 419                 text = "unknown authentication method";
 420
 421                 send_ldap_result( conn, op, rc,
 422                         NULL, text, NULL, NULL );
 423 #ifdef NEW_LOGGING
 424                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 425                            "do_bind: conn %ld  v%d unknown authentication method (%ld)\n",
 426                            conn->c_connid, version, method ));
 427 #else
 428                 Debug( LDAP_DEBUG_TRACE,
 429                         "do_bind: v%d unknown authentication method (%ld)\n",
 430                         version, method, 0 );
 431 #endif
 432                 goto cleanup;
 433         }
 434
 435         /*
 436          * We could be serving multiple database backends.  Select the
 437          * appropriate one, or send a referral to our "referral server"
 438          * if we don't hold it.
 439          */
 440
 441         if ( (be = select_backend( &ndn, 0, 0 )) == NULL ) {
 442                 if ( default_referral ) {
 443                         BVarray ref = referral_rewrite( default_referral,
 444                                 NULL, &pdn, LDAP_SCOPE_DEFAULT );
 445
 446                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 447                                 NULL, NULL, ref ? ref : default_referral, NULL );
 448
 449                         bvarray_free( ref );
 450
 451                 } else {
 452                         /* noSuchObject is not allowed to be returned by bind */
 453                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 454                                 NULL, NULL, NULL, NULL );
 455                 }
 456
 457                 goto cleanup;
 458         }
 459
 460         /* check restrictions */
 461         rc = backend_check_restrictions( be, conn, op, NULL, &text );
 462         if( rc != LDAP_SUCCESS ) {
 463                 send_ldap_result( conn, op, rc,
 464                         NULL, text, NULL, NULL );
 465                 goto cleanup;
 466         }
 467
 468         conn->c_authz_backend = be;
 469
 470         if ( be->be_bind ) {
 471                 int ret;
 472                 /* alias suffix */
 473                 struct berval edn = { 0, NULL };
 474
 475                 /* deref suffix alias if appropriate */
 476                 suffix_alias( be, &ndn );
 477
 478                 ret = (*be->be_bind)( be, conn, op,
 479                         &pdn, &ndn, method, &cred, &edn );
 480
 481                 if ( ret == 0 ) {
 482                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 483
 484                         if(edn.bv_len) {
 485                                 conn->c_dn = edn;
 486                         } else {
 487                                 ber_dupbv( &conn->c_dn, &pdn );
 488                         }
 489                         conn->c_cdn = pdn.bv_val;
 490                         pdn.bv_val = NULL;
 491                         pdn.bv_len = 0;
 492
 493                         conn->c_ndn = ndn;
 494                         ndn.bv_val = NULL;
 495                         ndn.bv_len = 0;
 496
 497                         if( conn->c_dn.bv_len != 0 ) {
 498                                 ber_len_t max = sockbuf_max_incoming;
 499                                 ber_sockbuf_ctrl( conn->c_sb,
 500                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
 501                         }
 502
 503 #ifdef NEW_LOGGING
 504                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 505                                 "do_bind: conn %d  v%d bind: \"%s\" to \"%s\" \n",
 506                                 conn->c_connid, version, conn->c_cdn, conn->c_dn.bv_val ));
 507 #else
 508                         Debug( LDAP_DEBUG_TRACE,
 509                                 "do_bind: v%d bind: \"%s\" to \"%s\"\n",
 510                                 version, conn->c_cdn, conn->c_dn.bv_val );
 511 #endif
 512
 513                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 514
 515                         /* send this here to avoid a race condition */
 516                         send_ldap_result( conn, op, LDAP_SUCCESS,
 517                                 NULL, NULL, NULL, NULL );
 518
 519                 } else if (edn.bv_val != NULL) {
 520                         free( edn.bv_val );
 521                 }
 522
 523         } else {
 524                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 525                         NULL, "operation not supported within namingContext",
 526                         NULL, NULL );
 527         }
 528
 529 cleanup:
 530         free( dn.bv_val );
 531         if( pdn.bv_val != NULL ) {
 532                 free( pdn.bv_val );
 533         }
 534         if( ndn.bv_val != NULL ) {
 535                 free( ndn.bv_val );
 536         }
 537         if ( mech != NULL ) {
 538                 free( mech );
 539         }
 540         if ( cred.bv_val != NULL ) {
 541                 free( cred.bv_val );
 542         }
 543
 544         return rc;
 545 }