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 != NULL ) {
  64                 free( op->o_dn );
  65                 op->o_dn = ch_strdup( "" );
  66         }
  67
  68         if ( op->o_ndn != NULL ) {
  69                 free( op->o_ndn );
  70                 op->o_ndn = ch_strdup( "" );
  71         }
  72
  73         /*
  74          * Parse the bind request.  It looks like this:
  75          *
  76          *      BindRequest ::= SEQUENCE {
  77          *              version         INTEGER,                 -- version
  78          *              name            DistinguishedName,       -- dn
  79          *              authentication  CHOICE {
  80          *                      simple          [0] OCTET STRING -- passwd
  81          *                      krbv42ldap      [1] OCTET STRING
  82          *                      krbv42dsa       [2] OCTET STRING
  83          *                      SASL            [3] SaslCredentials
  84          *              }
  85          *      }
  86          *
  87          *      SaslCredentials ::= SEQUENCE {
  88      *          mechanism           LDAPString,
  89      *          credentials         OCTET STRING OPTIONAL
  90          *      }
  91          */
  92
  93         tag = ber_scanf( ber, "{iot" /*}*/, &version, &dn, &method );
  94
  95         if ( tag == LBER_ERROR ) {
  96 #ifdef NEW_LOGGING
  97                 LDAP_LOG(( "operation", LDAP_LEVEL_ERR,
  98                         "do_bind: conn %d  ber_scanf failed\n", conn->c_connid ));
  99 #else
 100                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
 101 #endif
 102                 send_ldap_disconnect( conn, op,
 103                         LDAP_PROTOCOL_ERROR, "decoding error" );
 104                 rc = -1;
 105                 goto cleanup;
 106         }
 107
 108         op->o_protocol = version;
 109
 110         if( method != LDAP_AUTH_SASL ) {
 111                 tag = ber_scanf( ber, /*{*/ "o}", &cred );
 112
 113         } else {
 114                 tag = ber_scanf( ber, "{a" /*}*/, &mech );
 115
 116                 if ( tag != LBER_ERROR ) {
 117                         ber_len_t len;
 118                         tag = ber_peek_tag( ber, &len );
 119
 120                         if ( tag == LDAP_TAG_LDAPCRED ) {
 121                                 tag = ber_scanf( ber, "o", &cred );
 122                         } else {
 123                                 tag = LDAP_TAG_LDAPCRED;
 124                                 cred.bv_val = NULL;
 125                                 cred.bv_len = 0;
 126                         }
 127
 128                         if ( tag != LBER_ERROR ) {
 129                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 130                         }
 131                 }
 132         }
 133
 134         if ( tag == LBER_ERROR ) {
 135                 send_ldap_disconnect( conn, op,
 136                         LDAP_PROTOCOL_ERROR,
 137                 "decoding error" );
 138                 rc = SLAPD_DISCONNECT;
 139                 goto cleanup;
 140         }
 141
 142         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 143 #ifdef NEW_LOGGING
 144                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 145                         "do_bind: conn %d  get_ctrls failed\n", conn->c_connid ));
 146 #else
 147                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 148 #endif
 149                 goto cleanup;
 150         }
 151
 152         rc = dnPretty( NULL, &dn, &pdn );
 153         if ( rc != LDAP_SUCCESS ) {
 154 #ifdef NEW_LOGGING
 155                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 156                         "do_bind: conn %d  invalid dn (%s)\n",
 157                         conn->c_connid, dn.bv_val ));
 158 #else
 159                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n",
 160                         dn.bv_val, 0, 0 );
 161 #endif
 162                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 163                     "invalid DN", NULL, NULL );
 164                 goto cleanup;
 165         }
 166
 167         rc = dnNormalize( NULL, &dn, &ndn );
 168         if ( rc != LDAP_SUCCESS ) {
 169 #ifdef NEW_LOGGING
 170                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 171                         "do_bind: conn %d  invalid dn (%s)\n",
 172                         conn->c_connid, dn.bv_val ));
 173 #else
 174                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n",
 175                         dn.bv_val, 0, 0 );
 176 #endif
 177                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 178                     "invalid DN", NULL, NULL );
 179                 goto cleanup;
 180         }
 181
 182         if( method == LDAP_AUTH_SASL ) {
 183 #ifdef NEW_LOGGING
 184                 LDAP_LOG(( "operation",  LDAP_LEVEL_DETAIL1,
 185                         "do_sasl_bind: conn %d  dn (%s) mech %s\n", conn->c_connid,
 186                         pdn->bv_val, mech ));
 187 #else
 188                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 189                         pdn->bv_val, mech, NULL );
 190 #endif
 191
 192         } else {
 193 #ifdef NEW_LOGGING
 194                 LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 195                         "do_bind: conn %d  version=%ld dn=\"%s\" method=%ld\n",
 196                         conn->c_connid, (unsigned long) version,
 197                         pdn->bv_val, (unsigned long)method ));
 198 #else
 199                 Debug( LDAP_DEBUG_TRACE,
 200                         "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 201                         (unsigned long) version,
 202                         pdn->bv_val, (unsigned long) method );
 203 #endif
 204         }
 205
 206         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 207             op->o_connid, op->o_opid, pdn->bv_val, (unsigned long) method, 0 );
 208
 209         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 210 #ifdef NEW_LOGGING
 211                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 212                         "do_bind: conn %d  unknown version = %ld\n",
 213                         conn->c_connid, (unsigned long)version ));
 214 #else
 215                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 216                         (unsigned long) version, 0, 0 );
 217 #endif
 218                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 219                         NULL, "requested protocol version not supported", NULL, NULL );
 220                 goto cleanup;
 221
 222         } else if (!( global_allows & SLAP_ALLOW_BIND_V2 ) &&
 223                 version < LDAP_VERSION3 )
 224         {
 225                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 226                         NULL, "requested protocol version not allowed", NULL, NULL );
 227                 goto cleanup;
 228         }
 229
 230         /* we set connection version regardless of whether bind succeeds
 231          * or not.
 232          */
 233         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 234         conn->c_protocol = version;
 235         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 236
 237         if ( method == LDAP_AUTH_SASL ) {
 238                 char *edn;
 239                 slap_ssf_t ssf = 0;
 240
 241                 if ( version < LDAP_VERSION3 ) {
 242 #ifdef NEW_LOGGING
 243                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 244                                 "do_bind: conn %d  sasl with LDAPv%ld\n",
 245                                 conn->c_connid, (unsigned long)version ));
 246 #else
 247                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 248                                 (unsigned long) version, 0, 0 );
 249 #endif
 250                         send_ldap_disconnect( conn, op,
 251                                 LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
 252                         rc = SLAPD_DISCONNECT;
 253                         goto cleanup;
 254                 }
 255
 256                 if( mech == NULL || *mech == '\0' ) {
 257 #ifdef NEW_LOGGING
 258                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 259                                    "do_bind: conn %d  no SASL mechanism provided\n",
 260                                    conn->c_connid ));
 261 #else
 262                         Debug( LDAP_DEBUG_ANY,
 263                                 "do_bind: no sasl mechanism provided\n",
 264                                 0, 0, 0 );
 265 #endif
 266                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 267                                 NULL, "no SASL mechanism provided", NULL, NULL );
 268                         goto cleanup;
 269                 }
 270
 271                 /* check restrictions */
 272                 rc = backend_check_restrictions( NULL, conn, op, mech, &text );
 273                 if( rc != LDAP_SUCCESS ) {
 274                         send_ldap_result( conn, op, rc,
 275                                 NULL, text, NULL, NULL );
 276                         goto cleanup;
 277                 }
 278
 279                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 280                 if ( conn->c_sasl_bind_in_progress ) {
 281                         if((strcmp(conn->c_sasl_bind_mech, mech) != 0)) {
 282                                 /* mechanism changed between bind steps */
 283                                 slap_sasl_reset(conn);
 284                         }
 285                 } else {
 286                         conn->c_sasl_bind_mech = mech;
 287                         mech = NULL;
 288                 }
 289                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 290
 291                 edn = NULL;
 292                 rc = slap_sasl_bind( conn, op,
 293                         pdn->bv_val, ndn->bv_val,
 294                         &cred, &edn, &ssf );
 295
 296                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 297                 if( rc == LDAP_SUCCESS ) {
 298                         conn->c_dn = edn;
 299                         if( edn != NULL ) {
 300                                 conn->c_ndn = ch_strdup( edn );
 301                                 dn_normalize( conn->c_ndn );
 302                         }
 303                         conn->c_authmech = conn->c_sasl_bind_mech;
 304                         conn->c_sasl_bind_mech = NULL;
 305                         conn->c_sasl_bind_in_progress = 0;
 306
 307                         conn->c_sasl_ssf = ssf;
 308                         if( ssf > conn->c_ssf ) {
 309                                 conn->c_ssf = ssf;
 310                         }
 311
 312                         if( conn->c_dn != NULL ) {
 313                                 ber_len_t max = sockbuf_max_incoming;
 314                                 ber_sockbuf_ctrl( conn->c_sb,
 315                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
 316                         }
 317
 318                 } else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 319                         conn->c_sasl_bind_in_progress = 1;
 320
 321                 } else {
 322                         if ( conn->c_sasl_bind_mech ) {
 323                                 free( conn->c_sasl_bind_mech );
 324                                 conn->c_sasl_bind_mech = NULL;
 325                         }
 326                         conn->c_sasl_bind_in_progress = 0;
 327                 }
 328                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 329
 330                 goto cleanup;
 331
 332         } else {
 333                 /* Not SASL, cancel any in-progress bind */
 334                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 335
 336                 if ( conn->c_sasl_bind_mech != NULL ) {
 337                         free(conn->c_sasl_bind_mech);
 338                         conn->c_sasl_bind_mech = NULL;
 339                 }
 340                 conn->c_sasl_bind_in_progress = 0;
 341
 342                 slap_sasl_reset( conn );
 343                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 344         }
 345
 346         if ( method == LDAP_AUTH_SIMPLE ) {
 347                 /* accept "anonymous" binds */
 348                 if ( cred.bv_len == 0 || ndn->bv_len == 0 ) {
 349                         rc = LDAP_SUCCESS;
 350                         text = NULL;
 351
 352                         if( cred.bv_len &&
 353                                 !( global_allows & SLAP_ALLOW_BIND_ANON_CRED ))
 354                         {
 355                                 /* cred is not empty, disallow */
 356                                 rc = LDAP_INVALID_CREDENTIALS;
 357
 358                         } else if ( ndn->bv_len &&
 359                                 !( global_allows & SLAP_ALLOW_BIND_ANON_DN ))
 360                         {
 361                                 /* DN is not empty, disallow */
 362                                 rc = LDAP_UNWILLING_TO_PERFORM;
 363                                 text = "unwilling to allow anonymous bind with non-empty DN";
 364
 365                         } else if ( global_disallows & SLAP_DISALLOW_BIND_ANON ) {
 366                                 /* disallow */
 367                                 rc = LDAP_INAPPROPRIATE_AUTH;
 368                                 text = "anonymous bind disallowed";
 369
 370                         } else {
 371                                 rc = backend_check_restrictions( NULL, conn, op, mech, &text );
 372                         }
 373
 374                         /*
 375                          * we already forced connection to "anonymous",
 376                          * just need to send success
 377                          */
 378                         send_ldap_result( conn, op, rc,
 379                                 NULL, text, NULL, NULL );
 380 #ifdef NEW_LOGGING
 381                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 382                                    "do_bind: conn %d  v%d anonymous bind\n",
 383                                    conn->c_connid, version ));
 384 #else
 385                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
 386                                 version, 0, 0 );
 387 #endif
 388                         goto cleanup;
 389
 390                 } else if ( global_disallows & SLAP_DISALLOW_BIND_SIMPLE ) {
 391                         /* disallow simple authentication */
 392                         rc = LDAP_UNWILLING_TO_PERFORM;
 393                         text = "unwilling to perform simple authentication";
 394
 395                         send_ldap_result( conn, op, rc,
 396                                 NULL, text, NULL, NULL );
 397 #ifdef NEW_LOGGING
 398                         LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 399                                    "do_bind: conn %d  v%d simple bind(%s) disallowed\n",
 400                                    conn->c_connid, version, ndn ));
 401 #else
 402                         Debug( LDAP_DEBUG_TRACE,
 403                                 "do_bind: v%d simple bind(%s) disallowed\n",
 404                                 version, ndn, 0 );
 405 #endif
 406                         goto cleanup;
 407                 }
 408
 409 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 410         } else if ( method == LDAP_AUTH_KRBV41 || method == LDAP_AUTH_KRBV42 ) {
 411                 if ( global_disallows & SLAP_DISALLOW_BIND_KRBV4 ) {
 412                         /* disallow simple authentication */
 413                         rc = LDAP_UNWILLING_TO_PERFORM;
 414                         text = "unwilling to perform Kerberos V4 bind";
 415
 416                         send_ldap_result( conn, op, rc,
 417                                 NULL, text, NULL, NULL );
 418 #ifdef NEW_LOGGING
 419                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 420                                    "do_bind: conn %d  v%d Kerberos V4 bind\n",
 421                                    conn->c_connid, version ));
 422 #else
 423                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d Kerberos V4 bind\n",
 424                                 version, 0, 0 );
 425 #endif
 426                         goto cleanup;
 427                 }
 428 #endif
 429
 430         } else {
 431                 rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 432                 text = "unknown authentication method";
 433
 434                 send_ldap_result( conn, op, rc,
 435                         NULL, text, NULL, NULL );
 436 #ifdef NEW_LOGGING
 437                 LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
 438                            "do_bind: conn %ld  v%d unknown authentication method (%ld)\n",
 439                            conn->c_connid, version, method ));
 440 #else
 441                 Debug( LDAP_DEBUG_TRACE,
 442                         "do_bind: v%d unknown authentication method (%ld)\n",
 443                         version, method, 0 );
 444 #endif
 445                 goto cleanup;
 446         }
 447
 448         /*
 449          * We could be serving multiple database backends.  Select the
 450          * appropriate one, or send a referral to our "referral server"
 451          * if we don't hold it.
 452          */
 453
 454         if ( (be = select_backend( ndn->bv_val, 0, 0 )) == NULL ) {
 455                 if ( default_referral ) {
 456                         struct berval **ref = referral_rewrite( default_referral,
 457                                 NULL, pdn->bv_val, LDAP_SCOPE_DEFAULT );
 458
 459                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 460                                 NULL, NULL, ref ? ref : default_referral, NULL );
 461
 462                         ber_bvecfree( ref );
 463
 464                 } else {
 465                         /* noSuchObject is not allowed to be returned by bind */
 466                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 467                                 NULL, NULL, NULL, NULL );
 468                 }
 469
 470                 goto cleanup;
 471         }
 472
 473         /* check restrictions */
 474         rc = backend_check_restrictions( be, conn, op, NULL, &text );
 475         if( rc != LDAP_SUCCESS ) {
 476                 send_ldap_result( conn, op, rc,
 477                         NULL, text, NULL, NULL );
 478                 goto cleanup;
 479         }
 480
 481         conn->c_authz_backend = be;
 482
 483         if ( be->be_bind ) {
 484                 int ret;
 485                 /* alias suffix */
 486                 char *edn = NULL;
 487
 488                 /* deref suffix alias if appropriate */
 489                 ndn->bv_val = suffix_alias( be, ndn->bv_val );
 490                 ndn->bv_len = strlen( ndn->bv_val );
 491
 492                 ret = (*be->be_bind)( be, conn, op,
 493                         pdn->bv_val, ndn->bv_val,
 494                         method, &cred, &edn );
 495
 496                 if ( ret == 0 ) {
 497                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 498
 499                         conn->c_cdn = pdn->bv_val;
 500                         pdn->bv_val = NULL;
 501                         pdn->bv_len = 0;
 502
 503                         if(edn != NULL) {
 504                                 conn->c_dn = edn;
 505                         } else {
 506                                 conn->c_dn = ch_strdup( conn->c_cdn );
 507                         }
 508                         conn->c_ndn = ndn->bv_val;
 509                         ndn->bv_val = NULL;
 510                         ndn->bv_len = 0;
 511
 512                         if( conn->c_dn != NULL ) {
 513                                 ber_len_t max = sockbuf_max_incoming;
 514                                 ber_sockbuf_ctrl( conn->c_sb,
 515                                         LBER_SB_OPT_SET_MAX_INCOMING, &max );
 516                         }
 517
 518 #ifdef NEW_LOGGING
 519                         LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
 520                                 "do_bind: conn %d  v%d bind: \"%s\" to \"%s\" \n",
 521                                 conn->c_connid, version, conn->c_cdn, conn->c_dn ));
 522 #else
 523                         Debug( LDAP_DEBUG_TRACE,
 524                                 "do_bind: v%d bind: \"%s\" to \"%s\"\n",
 525                                 version, conn->c_cdn, conn->c_dn );
 526 #endif
 527
 528                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 529
 530                         /* send this here to avoid a race condition */
 531                         send_ldap_result( conn, op, LDAP_SUCCESS,
 532                                 NULL, NULL, NULL, NULL );
 533
 534                 } else if (edn != NULL) {
 535                         free( edn );
 536                 }
 537
 538         } else {
 539                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 540                         NULL, "operation not supported within namingContext",
 541                         NULL, NULL );
 542         }
 543
 544 cleanup:
 545         free( dn.bv_val );
 546         if( pdn != NULL ) {
 547                 ber_bvfree( pdn );
 548         }
 549         if( ndn != NULL ) {
 550                 ber_bvfree( ndn );
 551         }
 552         if ( mech != NULL ) {
 553                 free( mech );
 554         }
 555         if ( cred.bv_val != NULL ) {
 556                 free( cred.bv_val );
 557         }
 558
 559         return rc;
 560 }