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, "{imt" /*}*/, &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, /*{*/ "m}", &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, "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", 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         /* check for inappropriate controls */
 225         if( get_manageDSAit( op ) == SLAP_CRITICAL_CONTROL ) {
 226                 send_ldap_result( conn, op,
 227                         rc = LDAP_UNAVAILABLE_CRITICAL_EXTENSION,
 228                         NULL, "manageDSAit control inappropriate",
 229                         NULL, NULL );
 230                 goto cleanup;
 231         }
 232
 233         if ( method == LDAP_AUTH_SASL ) {
 234                 char *edn;
 235                 slap_ssf_t ssf = 0;
 236
 237                 if ( version < LDAP_VERSION3 ) {
 238 #ifdef NEW_LOGGING
 239                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 240                                 "do_bind: conn %d  sasl with LDAPv%ld\n",
 241                                 conn->c_connid, (unsigned long)version ));
 242 #else
 243                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 244                                 (unsigned long) version, 0, 0 );
 245 #endif
 246                         send_ldap_disconnect( conn, op,
 247                                 LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
 248                         rc = SLAPD_DISCONNECT;
 249                         goto cleanup;
 250                 }
 251
 252                 if( mech == NULL || mech[0] == '\0' ) {
 253 #ifdef NEW_LOGGING
 254                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 255                                    "do_bind: conn %d  no SASL mechanism provided\n",
 256                                    conn->c_connid ));
 257 #else
 258                         Debug( LDAP_DEBUG_ANY,
 259                                 "do_bind: no sasl mechanism provided\n",
 260                                 0, 0, 0 );
 261 #endif
 262                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 263                                 NULL, "no SASL mechanism provided", NULL, NULL );
 264                         goto cleanup;
 265                 }
 266
 267                 /* check restrictions */
 268                 rc = backend_check_restrictions( NULL, conn, op, mech, &text );
 269                 if( rc != LDAP_SUCCESS ) {
 270                         send_ldap_result( conn, op, rc,
 271                                 NULL, text, NULL, NULL );
 272                         goto cleanup;
 273                 }
 274
 275                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 276                 if ( conn->c_sasl_bind_in_progress ) {
 277                         if((strcmp(conn->c_sasl_bind_mech, mech) != 0)) {
 278                                 /* mechanism changed between bind steps */
 279                                 slap_sasl_reset(conn);
 280                         }
 281                 } else {
 282                         conn->c_sasl_bind_mech = mech;
 283                         mech = NULL;
 284                 }
 285                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 286
 287                 edn = NULL;
 288                 rc = slap_sasl_bind( conn, op,
 289                         &pdn, &ndn,
 290                         &cred, &edn, &ssf );
 291
 292                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 293                 if( rc == LDAP_SUCCESS ) {
 294                         conn->c_dn.bv_val = edn;
 295                         if( edn != NULL ) {
 296                                 conn->c_dn.bv_len = strlen( edn );
 297                                 dnNormalize2( NULL, &conn->c_dn, &conn->c_ndn );
 298                         }
 299                         conn->c_authmech = conn->c_sasl_bind_mech;
 300                         conn->c_sasl_bind_mech = NULL;
 301                         conn->c_sasl_bind_in_progress = 0;
 302
 303                         conn->c_sasl_ssf = ssf;
 304                         if( ssf > conn->c_ssf ) {
 305                                 conn->c_ssf = ssf;
 306                         }
 307
 308                         if( conn->c_dn.bv_len != 0 ) {
 309                                 ber_len_t max = sockbuf_max_incoming;
 310                                 ber_sockbuf_ctrl( conn->c_sb,
 311                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
 312                         }
 313
 314                 } else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 315                         conn->c_sasl_bind_in_progress = 1;
 316
 317                 } else {
 318                         if ( conn->c_sasl_bind_mech ) {
 319                                 free( conn->c_sasl_bind_mech );
 320                                 conn->c_sasl_bind_mech = NULL;
 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 != NULL ) {
 333                         free(conn->c_sasl_bind_mech);
 334                         conn->c_sasl_bind_mech = NULL;
 335                 }
 336                 conn->c_sasl_bind_in_progress = 0;
 337
 338                 slap_sasl_reset( conn );
 339                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 340         }
 341
 342         if ( method == LDAP_AUTH_SIMPLE ) {
 343                 /* accept "anonymous" binds */
 344                 if ( cred.bv_len == 0 || ndn.bv_len == 0 ) {
 345                         rc = LDAP_SUCCESS;
 346                         text = NULL;
 347
 348                         if( cred.bv_len &&
 349                                 !( global_allows & SLAP_ALLOW_BIND_ANON_CRED ))
 350                         {
 351                                 /* cred is not empty, disallow */
 352                                 rc = LDAP_INVALID_CREDENTIALS;
 353
 354                         } else if ( ndn.bv_len &&
 355                                 !( global_allows & SLAP_ALLOW_BIND_ANON_DN ))
 356                         {
 357                                 /* DN is not empty, disallow */
 358                                 rc = LDAP_UNWILLING_TO_PERFORM;
 359                                 text = "unwilling to allow anonymous bind with non-empty DN";
 360
 361                         } else if ( global_disallows & SLAP_DISALLOW_BIND_ANON ) {
 362                                 /* disallow */
 363                                 rc = LDAP_INAPPROPRIATE_AUTH;
 364                                 text = "anonymous bind disallowed";
 365
 366                         } else {
 367                                 rc = backend_check_restrictions( NULL, conn, op, mech, &text );
 368                         }
 369
 370                         /*
 371                          * we already forced connection to "anonymous",
 372                          * just need to send success
 373                          */
 374                         send_ldap_result( conn, op, rc,
 375                                 NULL, text, NULL, NULL );
 376 #ifdef NEW_LOGGING
 377                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 378                                    "do_bind: conn %d  v%d anonymous bind\n",
 379                                    conn->c_connid, version ));
 380 #else
 381                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
 382                                 version, 0, 0 );
 383 #endif
 384                         goto cleanup;
 385
 386                 } else if ( global_disallows & SLAP_DISALLOW_BIND_SIMPLE ) {
 387                         /* disallow simple authentication */
 388                         rc = LDAP_UNWILLING_TO_PERFORM;
 389                         text = "unwilling to perform simple authentication";
 390
 391                         send_ldap_result( conn, op, rc,
 392                                 NULL, text, NULL, NULL );
 393 #ifdef NEW_LOGGING
 394                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 395                                    "do_bind: conn %d  v%d simple bind(%s) disallowed\n",
 396                                    conn->c_connid, version, ndn.bv_val ));
 397 #else
 398                         Debug( LDAP_DEBUG_TRACE,
 399                                 "do_bind: v%d simple bind(%s) disallowed\n",
 400                                 version, ndn.bv_val, 0 );
 401 #endif
 402                         goto cleanup;
 403                 }
 404
 405 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 406         } else if ( method == LDAP_AUTH_KRBV41 || method == LDAP_AUTH_KRBV42 ) {
 407                 if ( global_disallows & SLAP_DISALLOW_BIND_KRBV4 ) {
 408                         /* disallow simple authentication */
 409                         rc = LDAP_UNWILLING_TO_PERFORM;
 410                         text = "unwilling to perform Kerberos V4 bind";
 411
 412                         send_ldap_result( conn, op, rc,
 413                                 NULL, text, NULL, NULL );
 414 #ifdef NEW_LOGGING
 415                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 416                                    "do_bind: conn %d  v%d Kerberos V4 bind\n",
 417                                    conn->c_connid, version ));
 418 #else
 419                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d Kerberos V4 bind\n",
 420                                 version, 0, 0 );
 421 #endif
 422                         goto cleanup;
 423                 }
 424 #endif
 425
 426         } else {
 427                 rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 428                 text = "unknown authentication method";
 429
 430                 send_ldap_result( conn, op, rc,
 431                         NULL, text, NULL, NULL );
 432 #ifdef NEW_LOGGING
 433                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 434                            "do_bind: conn %ld  v%d unknown authentication method (%ld)\n",
 435                            conn->c_connid, version, method ));
 436 #else
 437                 Debug( LDAP_DEBUG_TRACE,
 438                         "do_bind: v%d unknown authentication method (%ld)\n",
 439                         version, method, 0 );
 440 #endif
 441                 goto cleanup;
 442         }
 443
 444         /*
 445          * We could be serving multiple database backends.  Select the
 446          * appropriate one, or send a referral to our "referral server"
 447          * if we don't hold it.
 448          */
 449
 450         if ( (be = select_backend( &ndn, 0, 0 )) == NULL ) {
 451                 if ( default_referral ) {
 452                         BVarray ref = referral_rewrite( default_referral,
 453                                 NULL, &pdn, LDAP_SCOPE_DEFAULT );
 454
 455                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 456                                 NULL, NULL, ref ? ref : default_referral, NULL );
 457
 458                         bvarray_free( ref );
 459
 460                 } else {
 461                         /* noSuchObject is not allowed to be returned by bind */
 462                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 463                                 NULL, NULL, NULL, NULL );
 464                 }
 465
 466                 goto cleanup;
 467         }
 468
 469         /* check restrictions */
 470         rc = backend_check_restrictions( be, conn, op, NULL, &text );
 471         if( rc != LDAP_SUCCESS ) {
 472                 send_ldap_result( conn, op, rc,
 473                         NULL, text, NULL, NULL );
 474                 goto cleanup;
 475         }
 476
 477         conn->c_authz_backend = be;
 478
 479         if ( be->be_bind ) {
 480                 int ret;
 481                 /* alias suffix */
 482                 struct berval edn = { 0, NULL };
 483
 484                 /* deref suffix alias if appropriate */
 485                 suffix_alias( be, &ndn );
 486
 487                 ret = (*be->be_bind)( be, conn, op,
 488                         &pdn, &ndn, method, &cred, &edn );
 489
 490                 if ( ret == 0 ) {
 491                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 492
 493                         if(edn.bv_len) {
 494                                 conn->c_dn = edn;
 495                         } else {
 496                                 ber_dupbv( &conn->c_dn, &pdn );
 497                         }
 498                         conn->c_cdn = pdn;
 499                         pdn.bv_val = NULL;
 500                         pdn.bv_len = 0;
 501
 502                         conn->c_ndn = ndn;
 503                         ndn.bv_val = NULL;
 504                         ndn.bv_len = 0;
 505
 506                         if( conn->c_dn.bv_len != 0 ) {
 507                                 ber_len_t max = sockbuf_max_incoming;
 508                                 ber_sockbuf_ctrl( conn->c_sb,
 509                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
 510                         }
 511
 512 #ifdef NEW_LOGGING
 513                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 514                                 "do_bind: conn %d  v%d bind: \"%s\" to \"%s\" \n",
 515                                 conn->c_connid, version, conn->c_cdn.bv_val, conn->c_dn.bv_val ));
 516 #else
 517                         Debug( LDAP_DEBUG_TRACE,
 518                                 "do_bind: v%d bind: \"%s\" to \"%s\"\n",
 519                                 version, conn->c_cdn.bv_val, conn->c_dn.bv_val );
 520 #endif
 521
 522                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 523
 524                         /* send this here to avoid a race condition */
 525                         send_ldap_result( conn, op, LDAP_SUCCESS,
 526                                 NULL, NULL, NULL, NULL );
 527
 528                 } else if (edn.bv_val != NULL) {
 529                         free( edn.bv_val );
 530                 }
 531
 532         } else {
 533                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 534                         NULL, "operation not supported within namingContext",
 535                         NULL, NULL );
 536         }
 537
 538 cleanup:
 539         if( pdn.bv_val != NULL ) {
 540                 free( pdn.bv_val );
 541         }
 542         if( ndn.bv_val != NULL ) {
 543                 free( ndn.bv_val );
 544         }
 545         if ( mech != NULL ) {
 546                 free( mech );
 547         }
 548
 549         return rc;
 550 }