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