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;
  40         char            *saslmech;
  41         char            *dn;
  42         char *ndn;
  43         ber_tag_t       tag;
  44         int                     rc = LDAP_SUCCESS;
  45         const char      *text;
  46         struct berval   cred;
  47         Backend         *be;
  48
  49         Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
  50
  51         dn = NULL;
  52         ndn = NULL;
  53         mech = NULL;
  54         cred.bv_val = NULL;
  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, "{iat" /*}*/, &version, &dn, &method );
  94
  95         if ( tag == LBER_ERROR ) {
  96                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
  97                 send_ldap_disconnect( conn, op,
  98                         LDAP_PROTOCOL_ERROR, "decoding error" );
  99                 rc = -1;
 100                 goto cleanup;
 101         }
 102
 103         op->o_protocol = version;
 104
 105         if( method != LDAP_AUTH_SASL ) {
 106                 tag = ber_scanf( ber, /*{*/ "o}", &cred );
 107
 108         } else {
 109                 tag = ber_scanf( ber, "{a" /*}*/, &mech );
 110
 111                 if ( tag != LBER_ERROR ) {
 112                         ber_len_t len;
 113                         tag = ber_peek_tag( ber, &len );
 114
 115                         if ( tag == LDAP_TAG_LDAPCRED ) {
 116                                 tag = ber_scanf( ber, "o", &cred );
 117                         } else {
 118                                 tag = LDAP_TAG_LDAPCRED;
 119                                 cred.bv_val = NULL;
 120                                 cred.bv_len = 0;
 121                         }
 122
 123                         if ( tag != LBER_ERROR ) {
 124                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 125                         }
 126                 }
 127         }
 128
 129         if ( tag == LBER_ERROR ) {
 130                 send_ldap_disconnect( conn, op,
 131                         LDAP_PROTOCOL_ERROR,
 132                 "decoding error" );
 133                 rc = SLAPD_DISCONNECT;
 134                 goto cleanup;
 135         }
 136
 137         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 138                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 139                 goto cleanup;
 140         }
 141
 142         ndn = ch_strdup( dn );
 143
 144         if ( dn_normalize( ndn ) == NULL ) {
 145                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
 146                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 147                     "invalid DN", NULL, NULL );
 148                 goto cleanup;
 149         }
 150
 151         if( method == LDAP_AUTH_SASL ) {
 152                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 153                         dn, mech, NULL );
 154         } else {
 155                 Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 156                         (unsigned long) version, dn, (unsigned long) method );
 157         }
 158
 159         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 160             op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
 161
 162         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 163                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 164                         (unsigned long) version, 0, 0 );
 165                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 166                         NULL, "requested protocol version not supported", NULL, NULL );
 167                 goto cleanup;
 168
 169         } else if (( global_disallows & SLAP_DISALLOW_BIND_V2 ) &&
 170                 version < LDAP_VERSION3 )
 171         {
 172                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 173                         NULL, "requested protocol version not allowed", NULL, NULL );
 174                 goto cleanup;
 175         }
 176
 177         /* we set connection version regardless of whether bind succeeds
 178          * or not.
 179          */
 180         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 181         conn->c_protocol = version;
 182         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 183
 184         if ( method == LDAP_AUTH_SASL ) {
 185                 char *edn;
 186                 slap_ssf_t ssf = 0;
 187
 188                 if ( version < LDAP_VERSION3 ) {
 189                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 190                                 (unsigned long) version, 0, 0 );
 191                         send_ldap_disconnect( conn, op,
 192                                 LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
 193                         rc = SLAPD_DISCONNECT;
 194                         goto cleanup;
 195                 }
 196
 197                 if( mech == NULL || *mech == '\0' ) {
 198                         Debug( LDAP_DEBUG_ANY,
 199                                 "do_bind: no sasl mechanism provided\n",
 200                                 0, 0, 0 );
 201                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 202                                 NULL, "no SASL mechanism provided", NULL, NULL );
 203                         goto cleanup;
 204                 }
 205
 206                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 207
 208                 if ( conn->c_sasl_bind_mech != NULL ) {
 209                         /* SASL bind is in progress */
 210                         saslmech = NULL;
 211
 212                         if((strcmp(conn->c_sasl_bind_mech, mech) != 0)) {
 213                                 /* mechanism changed */
 214                                 slap_sasl_reset(conn);
 215                         }
 216
 217                         free( conn->c_sasl_bind_mech );
 218                         conn->c_sasl_bind_mech = NULL;
 219
 220 #ifdef LDAP_DEBUG
 221                 } else {
 222                         /* SASL bind is NOT in progress */
 223                         saslmech = mech;
 224                         assert( conn->c_sasl_bind_mech == NULL );
 225 #endif
 226                 }
 227
 228                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 229
 230                 edn = NULL;
 231                 rc = slap_sasl_bind( conn, op, dn, ndn, saslmech, &cred,
 232                         &edn, &ssf );
 233
 234                 if( rc == LDAP_SUCCESS ) {
 235                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 236                         conn->c_dn = edn;
 237                         conn->c_authmech = mech;
 238                         if( ssf ) conn->c_sasl_layers++;
 239                         conn->c_sasl_ssf = ssf;
 240                         if( ssf > conn->c_ssf ) {
 241                                 conn->c_ssf = ssf;
 242                         }
 243                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 244
 245                 } else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 246                         conn->c_sasl_bind_mech = mech;
 247                 }
 248
 249                 mech = NULL;
 250
 251                 goto cleanup;
 252
 253         } else {
 254                 /* Not SASL, cancel any in-progress bind */
 255                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 256
 257                 if ( conn->c_sasl_bind_mech != NULL ) {
 258                         assert( conn->c_sasl_bind_in_progress );
 259
 260                         free(conn->c_sasl_bind_mech);
 261                         conn->c_sasl_bind_mech = NULL;
 262
 263                 } else {
 264                         assert( !conn->c_sasl_bind_in_progress );
 265                 }
 266
 267                 slap_sasl_reset( conn );
 268                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 269         }
 270
 271         if ( method == LDAP_AUTH_SIMPLE ) {
 272                 /* accept "anonymous" binds */
 273                 if ( cred.bv_len == 0 || ndn == NULL || *ndn == '\0' ) {
 274                         rc = LDAP_SUCCESS;
 275                         text = NULL;
 276
 277                         if( cred.bv_len &&
 278                                 ( global_disallows & SLAP_DISALLOW_BIND_ANON_CRED ))
 279                         {
 280                                 /* cred is not empty, disallow */
 281                                 rc = LDAP_INVALID_CREDENTIALS;
 282
 283                         } else if ( ndn != NULL && *ndn != '\0' &&
 284                                 ( global_disallows & SLAP_DISALLOW_BIND_ANON_DN ))
 285                         {
 286                                 /* DN is not empty, disallow */
 287                                 rc = LDAP_UNWILLING_TO_PERFORM;
 288                                 text = "unwilling to allow anonymous bind with non-empty DN";
 289
 290                         } else if ( global_disallows & SLAP_DISALLOW_BIND_ANON ) {
 291                                 /* disallow */
 292                                 rc = LDAP_INAPPROPRIATE_AUTH;
 293                                 text = "anonymous bind disallowed";
 294                         }
 295
 296                         /*
 297                          * we already forced connection to "anonymous",
 298                          * just need to send success
 299                          */
 300                         send_ldap_result( conn, op, rc,
 301                                 NULL, text, NULL, NULL );
 302                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
 303                                 version, 0, 0 );
 304                         goto cleanup;
 305
 306                 } else if ( global_disallows & SLAP_DISALLOW_BIND_SIMPLE ) {
 307                         /* disallow simple authentication */
 308                         rc = LDAP_UNWILLING_TO_PERFORM;
 309                         text = "unwilling to perform simple authentication";
 310
 311                         send_ldap_result( conn, op, rc,
 312                                 NULL, text, NULL, NULL );
 313                         Debug( LDAP_DEBUG_TRACE,
 314                                 "do_bind: v%d simple bind(%s) disallowed\n",
 315                                 version, ndn, 0 );
 316                         goto cleanup;
 317                 }
 318
 319 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 320         } else if ( method == LDAP_AUTH_KRBV41 || method == LDAP_AUTH_KRBV42 ) {
 321                 if ( global_disallows & SLAP_DISALLOW_BIND_KRBV4 ) {
 322                         /* disallow simple authentication */
 323                         rc = LDAP_UNWILLING_TO_PERFORM;
 324                         text = "unwilling to perform Kerberos V4 bind";
 325
 326                         send_ldap_result( conn, op, rc,
 327                                 NULL, text, NULL, NULL );
 328                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d Kerberos V4 bind\n",
 329                                 version, 0, 0 );
 330                         goto cleanup;
 331                 }
 332 #endif
 333
 334         } else {
 335                 rc = LDAP_AUTH_UNKNOWN;
 336                 text = "unknown authentication method";
 337
 338                 send_ldap_result( conn, op, rc,
 339                         NULL, text, NULL, NULL );
 340                 Debug( LDAP_DEBUG_TRACE,
 341                         "do_bind: v%d unknown authentication method (%d)\n",
 342                         version, method, 0 );
 343                 goto cleanup;
 344         }
 345
 346         /*
 347          * We could be serving multiple database backends.  Select the
 348          * appropriate one, or send a referral to our "referral server"
 349          * if we don't hold it.
 350          */
 351
 352         if ( (be = select_backend( ndn )) == NULL ) {
 353                 if ( default_referral ) {
 354                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 355                                 NULL, NULL, default_referral, NULL );
 356
 357                 } else {
 358                         /* noSuchObject is not allowed to be returned by bind */
 359                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 360                                 NULL, NULL, NULL, NULL );
 361                 }
 362
 363                 goto cleanup;
 364         }
 365
 366         /* check restrictions */
 367         rc = backend_check_restrictions( be, conn, op, NULL, &text ) ;
 368         if( rc != LDAP_SUCCESS ) {
 369                 send_ldap_result( conn, op, rc,
 370                         NULL, text, NULL, NULL );
 371                 goto cleanup;
 372         }
 373
 374         conn->c_authz_backend = be;
 375
 376         if ( be->be_bind ) {
 377                 int ret;
 378                 /* alias suffix */
 379                 char *edn = NULL;
 380
 381                 /* deref suffix alias if appropriate */
 382                 ndn = suffix_alias( be, ndn );
 383
 384                 ret = (*be->be_bind)( be, conn, op, dn, ndn,
 385                         method, &cred, &edn );
 386
 387                 if ( ret == 0 ) {
 388                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 389
 390                         conn->c_cdn = dn;
 391                         dn = NULL;
 392
 393                         if(edn != NULL) {
 394                                 conn->c_dn = edn;
 395                         } else {
 396                                 conn->c_dn = ndn;
 397                                 ndn = NULL;
 398                         }
 399
 400                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d bind: \"%s\" to \"%s\"\n",
 401                         version, conn->c_cdn, conn->c_dn );
 402
 403                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 404
 405                         /* send this here to avoid a race condition */
 406                         send_ldap_result( conn, op, LDAP_SUCCESS,
 407                                 NULL, NULL, NULL, NULL );
 408
 409                 } else if (edn != NULL) {
 410                         free( edn );
 411                 }
 412
 413         } else {
 414                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 415                         NULL, "operation not supported within namingContext", NULL, NULL );
 416         }
 417
 418 cleanup:
 419         if( rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 420                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 421
 422                 /* dispose of mech */
 423                 free( conn->c_sasl_bind_mech );
 424                 conn->c_sasl_bind_mech = NULL;
 425
 426                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 427         }
 428
 429         if( dn != NULL ) {
 430                 free( dn );
 431         }
 432         if( ndn != NULL ) {
 433                 free( ndn );
 434         }
 435         if ( mech != NULL ) {
 436                 free( mech );
 437         }
 438         if ( cred.bv_val != NULL ) {
 439                 free( cred.bv_val );
 440         }
 441
 442         return rc;
 443 }