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            *dn;
  41         char *ndn;
  42         ber_tag_t       tag;
  43         int                     rc = LDAP_SUCCESS;
  44         const char      *text;
  45         struct berval   cred;
  46         Backend         *be;
  47
  48         Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
  49
  50         dn = NULL;
  51         ndn = NULL;
  52         mech = NULL;
  53         cred.bv_val = NULL;
  54
  55         /*
  56          * Force to connection to "anonymous" until bind succeeds.
  57          */
  58         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
  59         connection2anonymous( conn );
  60         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
  61
  62         if ( op->o_dn != NULL ) {
  63                 free( op->o_dn );
  64                 op->o_dn = ch_strdup( "" );
  65         }
  66
  67         if ( op->o_ndn != NULL ) {
  68                 free( op->o_ndn );
  69                 op->o_ndn = ch_strdup( "" );
  70         }
  71
  72         /*
  73          * Parse the bind request.  It looks like this:
  74          *
  75          *      BindRequest ::= SEQUENCE {
  76          *              version         INTEGER,                 -- version
  77          *              name            DistinguishedName,       -- dn
  78          *              authentication  CHOICE {
  79          *                      simple          [0] OCTET STRING -- passwd
  80          *                      krbv42ldap      [1] OCTET STRING
  81          *                      krbv42dsa       [2] OCTET STRING
  82          *                      SASL            [3] SaslCredentials
  83          *              }
  84          *      }
  85          *
  86          *      SaslCredentials ::= SEQUENCE {
  87      *          mechanism           LDAPString,
  88      *          credentials         OCTET STRING OPTIONAL
  89          *      }
  90          */
  91
  92         tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
  93
  94         if ( tag == LBER_ERROR ) {
  95                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
  96                 send_ldap_disconnect( conn, op,
  97                         LDAP_PROTOCOL_ERROR, "decoding error" );
  98                 rc = -1;
  99                 goto cleanup;
 100         }
 101
 102         op->o_protocol = version;
 103
 104         if( method != LDAP_AUTH_SASL ) {
 105                 tag = ber_scanf( ber, /*{*/ "o}", &cred );
 106
 107         } else {
 108                 tag = ber_scanf( ber, "{a" /*}*/, &mech );
 109
 110                 if ( tag != LBER_ERROR ) {
 111                         ber_len_t len;
 112                         tag = ber_peek_tag( ber, &len );
 113
 114                         if ( tag == LDAP_TAG_LDAPCRED ) {
 115                                 tag = ber_scanf( ber, "o", &cred );
 116                         } else {
 117                                 tag = LDAP_TAG_LDAPCRED;
 118                                 cred.bv_val = NULL;
 119                                 cred.bv_len = 0;
 120                         }
 121
 122                         if ( tag != LBER_ERROR ) {
 123                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 124                         }
 125                 }
 126         }
 127
 128         if ( tag == LBER_ERROR ) {
 129                 send_ldap_disconnect( conn, op,
 130                         LDAP_PROTOCOL_ERROR,
 131                 "decoding error" );
 132                 rc = SLAPD_DISCONNECT;
 133                 goto cleanup;
 134         }
 135
 136         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 137                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 138                 goto cleanup;
 139         }
 140
 141         ndn = ch_strdup( dn );
 142
 143         if ( dn_normalize( ndn ) == NULL ) {
 144                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
 145                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 146                     "invalid DN", NULL, NULL );
 147                 goto cleanup;
 148         }
 149
 150         if( method == LDAP_AUTH_SASL ) {
 151                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 152                         dn, mech, NULL );
 153         } else {
 154                 Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 155                         (unsigned long) version, dn, (unsigned long) method );
 156         }
 157
 158         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 159             op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
 160
 161         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 162                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 163                         (unsigned long) version, 0, 0 );
 164                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 165                         NULL, "requested protocol version not supported", NULL, NULL );
 166                 goto cleanup;
 167
 168         } else if (( global_disallows & SLAP_DISALLOW_BIND_V2 ) &&
 169                 version < LDAP_VERSION3 )
 170         {
 171                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 172                         NULL, "requested protocol version not allowed", NULL, NULL );
 173                 goto cleanup;
 174         }
 175
 176         /* we set connection version regardless of whether bind succeeds
 177          * or not.
 178          */
 179         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 180         conn->c_protocol = version;
 181         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 182
 183         if ( method == LDAP_AUTH_SASL ) {
 184                 char *edn;
 185                 slap_ssf_t ssf = 0;
 186
 187                 if ( version < LDAP_VERSION3 ) {
 188                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 189                                 (unsigned long) version, 0, 0 );
 190                         send_ldap_disconnect( conn, op,
 191                                 LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
 192                         rc = SLAPD_DISCONNECT;
 193                         goto cleanup;
 194                 }
 195
 196                 if( mech == NULL || *mech == '\0' ) {
 197                         Debug( LDAP_DEBUG_ANY,
 198                                 "do_bind: no sasl mechanism provided\n",
 199                                 0, 0, 0 );
 200                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 201                                 NULL, "no SASL mechanism provided", NULL, NULL );
 202                         goto cleanup;
 203                 }
 204
 205                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 206                 if ( conn->c_sasl_bind_in_progress ) {
 207                         if((strcmp(conn->c_sasl_bind_mech, mech) != 0)) {
 208                                 /* mechanism changed between bind steps */
 209                                 slap_sasl_reset(conn);
 210                         }
 211                 } else {
 212                         conn->c_sasl_bind_mech = mech;
 213                         mech = NULL;
 214                 }
 215                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 216
 217                 edn = NULL;
 218                 rc = slap_sasl_bind( conn, op, dn, ndn, &cred, &edn, &ssf );
 219
 220                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 221                 if( rc == LDAP_SUCCESS ) {
 222                         conn->c_dn = edn;
 223                         conn->c_authmech = conn->c_sasl_bind_mech;
 224                         conn->c_sasl_bind_mech = NULL;
 225                         conn->c_sasl_bind_in_progress = 0;
 226                         if( ssf ) conn->c_sasl_layers++;
 227                         conn->c_sasl_ssf = ssf;
 228                         if( ssf > conn->c_ssf ) {
 229                                 conn->c_ssf = ssf;
 230                         }
 231                 } else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 232                         conn->c_sasl_bind_in_progress = 1;
 233
 234                 } else {
 235                         if ( conn->c_sasl_bind_mech ) {
 236                                 free( conn->c_sasl_bind_mech );
 237                                 conn->c_sasl_bind_mech = NULL;
 238                         }
 239                         conn->c_sasl_bind_in_progress = 0;
 240                 }
 241                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 242
 243                 goto cleanup;
 244
 245         } else {
 246                 /* Not SASL, cancel any in-progress bind */
 247                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 248
 249                 if ( conn->c_sasl_bind_mech != NULL ) {
 250                         free(conn->c_sasl_bind_mech);
 251                         conn->c_sasl_bind_mech = NULL;
 252                 }
 253                 conn->c_sasl_bind_in_progress = 0;
 254
 255                 slap_sasl_reset( conn );
 256                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 257         }
 258
 259         if ( method == LDAP_AUTH_SIMPLE ) {
 260                 /* accept "anonymous" binds */
 261                 if ( cred.bv_len == 0 || ndn == NULL || *ndn == '\0' ) {
 262                         rc = LDAP_SUCCESS;
 263                         text = NULL;
 264
 265                         if( cred.bv_len &&
 266                                 ( global_disallows & SLAP_DISALLOW_BIND_ANON_CRED ))
 267                         {
 268                                 /* cred is not empty, disallow */
 269                                 rc = LDAP_INVALID_CREDENTIALS;
 270
 271                         } else if ( ndn != NULL && *ndn != '\0' &&
 272                                 ( global_disallows & SLAP_DISALLOW_BIND_ANON_DN ))
 273                         {
 274                                 /* DN is not empty, disallow */
 275                                 rc = LDAP_UNWILLING_TO_PERFORM;
 276                                 text = "unwilling to allow anonymous bind with non-empty DN";
 277
 278                         } else if ( global_disallows & SLAP_DISALLOW_BIND_ANON ) {
 279                                 /* disallow */
 280                                 rc = LDAP_INAPPROPRIATE_AUTH;
 281                                 text = "anonymous bind disallowed";
 282                         }
 283
 284                         /*
 285                          * we already forced connection to "anonymous",
 286                          * just need to send success
 287                          */
 288                         send_ldap_result( conn, op, rc,
 289                                 NULL, text, NULL, NULL );
 290                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
 291                                 version, 0, 0 );
 292                         goto cleanup;
 293
 294                 } else if ( global_disallows & SLAP_DISALLOW_BIND_SIMPLE ) {
 295                         /* disallow simple authentication */
 296                         rc = LDAP_UNWILLING_TO_PERFORM;
 297                         text = "unwilling to perform simple authentication";
 298
 299                         send_ldap_result( conn, op, rc,
 300                                 NULL, text, NULL, NULL );
 301                         Debug( LDAP_DEBUG_TRACE,
 302                                 "do_bind: v%d simple bind(%s) disallowed\n",
 303                                 version, ndn, 0 );
 304                         goto cleanup;
 305                 }
 306
 307 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 308         } else if ( method == LDAP_AUTH_KRBV41 || method == LDAP_AUTH_KRBV42 ) {
 309                 if ( global_disallows & SLAP_DISALLOW_BIND_KRBV4 ) {
 310                         /* disallow simple authentication */
 311                         rc = LDAP_UNWILLING_TO_PERFORM;
 312                         text = "unwilling to perform Kerberos V4 bind";
 313
 314                         send_ldap_result( conn, op, rc,
 315                                 NULL, text, NULL, NULL );
 316                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d Kerberos V4 bind\n",
 317                                 version, 0, 0 );
 318                         goto cleanup;
 319                 }
 320 #endif
 321
 322         } else {
 323                 rc = LDAP_AUTH_UNKNOWN;
 324                 text = "unknown authentication method";
 325
 326                 send_ldap_result( conn, op, rc,
 327                         NULL, text, NULL, NULL );
 328                 Debug( LDAP_DEBUG_TRACE,
 329                         "do_bind: v%d unknown authentication method (%d)\n",
 330                         version, method, 0 );
 331                 goto cleanup;
 332         }
 333
 334         /*
 335          * We could be serving multiple database backends.  Select the
 336          * appropriate one, or send a referral to our "referral server"
 337          * if we don't hold it.
 338          */
 339
 340         if ( (be = select_backend( ndn )) == NULL ) {
 341                 if ( default_referral ) {
 342                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 343                                 NULL, NULL, default_referral, NULL );
 344
 345                 } else {
 346                         /* noSuchObject is not allowed to be returned by bind */
 347                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 348                                 NULL, NULL, NULL, NULL );
 349                 }
 350
 351                 goto cleanup;
 352         }
 353
 354         /* check restrictions */
 355         rc = backend_check_restrictions( be, conn, op, NULL, &text ) ;
 356         if( rc != LDAP_SUCCESS ) {
 357                 send_ldap_result( conn, op, rc,
 358                         NULL, text, NULL, NULL );
 359                 goto cleanup;
 360         }
 361
 362         conn->c_authz_backend = be;
 363
 364         if ( be->be_bind ) {
 365                 int ret;
 366                 /* alias suffix */
 367                 char *edn = NULL;
 368
 369                 /* deref suffix alias if appropriate */
 370                 ndn = suffix_alias( be, ndn );
 371
 372                 ret = (*be->be_bind)( be, conn, op, dn, ndn,
 373                         method, &cred, &edn );
 374
 375                 if ( ret == 0 ) {
 376                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 377
 378                         conn->c_cdn = dn;
 379                         dn = NULL;
 380
 381                         if(edn != NULL) {
 382                                 conn->c_dn = edn;
 383                         } else {
 384                                 conn->c_dn = ndn;
 385                                 ndn = NULL;
 386                         }
 387
 388                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d bind: \"%s\" to \"%s\"\n",
 389                         version, conn->c_cdn, conn->c_dn );
 390
 391                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 392
 393                         /* send this here to avoid a race condition */
 394                         send_ldap_result( conn, op, LDAP_SUCCESS,
 395                                 NULL, NULL, NULL, NULL );
 396
 397                 } else if (edn != NULL) {
 398                         free( edn );
 399                 }
 400
 401         } else {
 402                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 403                         NULL, "operation not supported within namingContext", NULL, NULL );
 404         }
 405
 406 cleanup:
 407         if( dn != NULL ) {
 408                 free( dn );
 409         }
 410         if( ndn != NULL ) {
 411                 free( ndn );
 412         }
 413         if ( mech != NULL ) {
 414                 free( mech );
 415         }
 416         if ( cred.bv_val != NULL ) {
 417                 free( cred.bv_val );
 418         }
 419
 420         return rc;
 421 }