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 1998-1999 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         struct berval   cred;
  45         Backend         *be;
  46
  47         Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
  48
  49         dn = NULL;
  50         ndn = NULL;
  51         mech = NULL;
  52         cred.bv_val = NULL;
  53
  54         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
  55
  56         /* Force to connection to "anonymous" until bind succeeds.
  57          * This may need to be relocated or done on a case by case basis
  58          * to handle certain SASL mechanisms.
  59          */
  60
  61         if ( conn->c_cdn != NULL ) {
  62                 free( conn->c_cdn );
  63                 conn->c_cdn = NULL;
  64         }
  65
  66         if ( conn->c_dn != NULL ) {
  67                 free( conn->c_dn );
  68                 conn->c_dn = NULL;
  69         }
  70
  71         conn->c_authz_backend = NULL;
  72
  73         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
  74
  75         if ( op->o_dn != NULL ) {
  76                 free( op->o_dn );
  77                 op->o_dn = ch_strdup( "" );
  78         }
  79
  80         if ( op->o_ndn != NULL ) {
  81                 free( op->o_ndn );
  82                 op->o_ndn = ch_strdup( "" );
  83         }
  84
  85         /*
  86          * Parse the bind request.  It looks like this:
  87          *
  88          *      BindRequest ::= SEQUENCE {
  89          *              version         INTEGER,                 -- version
  90          *              name            DistinguishedName,       -- dn
  91          *              authentication  CHOICE {
  92          *                      simple          [0] OCTET STRING -- passwd
  93          *                      krbv42ldap      [1] OCTET STRING
  94          *                      krbv42dsa       [2] OCTET STRING
  95          *                      SASL            [3] SaslCredentials
  96          *              }
  97          *      }
  98          *
  99          *      SaslCredentials ::= SEQUENCE {
 100      *          mechanism           LDAPString,
 101      *          credentials         OCTET STRING OPTIONAL
 102          *      }
 103          */
 104
 105         tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
 106
 107         if ( tag == LBER_ERROR ) {
 108                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
 109                 send_ldap_disconnect( conn, op,
 110                         LDAP_PROTOCOL_ERROR, "decoding error" );
 111                 rc = -1;
 112                 goto cleanup;
 113         }
 114
 115         ndn = ch_strdup( dn );
 116
 117         if ( dn_normalize( ndn ) == NULL ) {
 118                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
 119                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 120                     "invalid DN", NULL, NULL );
 121                 goto cleanup;
 122         }
 123
 124         op->o_protocol = version;
 125
 126         if( method != LDAP_AUTH_SASL ) {
 127                 tag = ber_scanf( ber, /*{*/ "o}", &cred );
 128
 129         } else {
 130                 tag = ber_scanf( ber, "{a" /*}*/, &mech );
 131
 132                 if ( tag != LBER_ERROR ) {
 133                         ber_len_t len;
 134                         tag = ber_peek_tag( ber, &len );
 135
 136                         if ( tag == LDAP_TAG_LDAPCRED ) {
 137                                 tag = ber_scanf( ber, "o", &cred );
 138                         }
 139
 140                         if ( tag != LBER_ERROR ) {
 141                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 142                         }
 143                 }
 144         }
 145
 146         if ( tag == LBER_ERROR ) {
 147                 send_ldap_disconnect( conn, op,
 148                         LDAP_PROTOCOL_ERROR,
 149                 "decoding error" );
 150                 rc = -1;
 151                 goto cleanup;
 152         }
 153
 154         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 155                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 156                 goto cleanup;
 157         }
 158
 159         if( method == LDAP_AUTH_SASL ) {
 160                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 161                         dn, mech, NULL );
 162         } else {
 163                 Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 164                         (unsigned long) version, dn, (unsigned long) method );
 165         }
 166
 167         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 168             op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
 169
 170         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 171                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 172                         (unsigned long) version, 0, 0 );
 173                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 174                         NULL, "version not supported", NULL, NULL );
 175                 goto cleanup;
 176         }
 177
 178         if ( method == LDAP_AUTH_SASL ) {
 179                 if ( version < LDAP_VERSION3 ) {
 180                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 181                                 (unsigned long) version, 0, 0 );
 182                         send_ldap_disconnect( conn, op,
 183                                 LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
 184                         rc = -1;
 185                         goto cleanup;
 186                 }
 187
 188                 if( mech == NULL || *mech == '\0' ) {
 189                         Debug( LDAP_DEBUG_ANY,
 190                                 "do_bind: no sasl mechanism provided\n",
 191                                 0, 0, 0 );
 192                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 193                                 NULL, "no sasl mechanism provided", NULL, NULL );
 194                         goto cleanup;
 195                 }
 196
 197                 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
 198                         Debug( LDAP_DEBUG_ANY,
 199                                 "do_bind: sasl mechanism=\"%s\" not supported.\n",
 200                                 mech, 0, 0 );
 201                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 202                                 NULL, "sasl mechanism not supported", NULL, NULL );
 203                         goto cleanup;
 204                 }
 205
 206                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 207
 208                 if ( conn->c_authmech != NULL ) {
 209                         assert( conn->c_bind_in_progress );
 210
 211                         if((strcmp(conn->c_authmech, mech) != 0)) {
 212                                 /* mechanism changed, cancel in progress bind */
 213                                 conn->c_bind_in_progress = 0;
 214                                 if( conn->c_authstate != NULL ) {
 215                                         free(conn->c_authstate);
 216                                         conn->c_authstate = NULL;
 217                                 }
 218                                 free(conn->c_authmech);
 219                                 conn->c_authmech = NULL;
 220                         }
 221
 222 #ifdef LDAP_DEBUG
 223                 } else {
 224                         assert( !conn->c_bind_in_progress );
 225                         assert( conn->c_authmech == NULL );
 226                         assert( conn->c_authstate == NULL );
 227 #endif
 228                 }
 229
 230         } else {
 231                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 232
 233                 if ( conn->c_authmech != NULL ) {
 234                         assert( conn->c_bind_in_progress );
 235
 236                         /* cancel in progress bind */
 237                         conn->c_bind_in_progress = 0;
 238
 239                         if( conn->c_authstate != NULL ) {
 240                                 free(conn->c_authstate);
 241                                 conn->c_authstate = NULL;
 242                         }
 243                         free(conn->c_authmech);
 244                         conn->c_authmech = NULL;
 245                 }
 246         }
 247
 248         conn->c_protocol = version;
 249         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 250
 251         /* accept null binds */
 252         if ( ndn == NULL || *ndn == '\0' ) {
 253                 /*
 254                  * we already forced connection to "anonymous", we just
 255                  * need to send success
 256                  */
 257                 send_ldap_result( conn, op, LDAP_SUCCESS,
 258                         NULL, NULL, NULL, NULL );
 259                 goto cleanup;
 260         }
 261
 262         /*
 263          * We could be serving multiple database backends.  Select the
 264          * appropriate one, or send a referral to our "referral server"
 265          * if we don't hold it.
 266          */
 267
 268         if ( (be = select_backend( ndn )) == NULL ) {
 269                 if ( cred.bv_len == 0 ) {
 270                         send_ldap_result( conn, op, LDAP_SUCCESS,
 271                                 NULL, NULL, NULL, NULL );
 272
 273                 } else if ( default_referral ) {
 274                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 275                                 NULL, NULL, default_referral, NULL );
 276
 277                 } else {
 278                         /* noSuchObject is not allowed to be returned by bind */
 279                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 280                                 NULL, NULL, NULL, NULL );
 281                 }
 282
 283                 goto cleanup;
 284         }
 285
 286         conn->c_authz_backend = be;
 287
 288         /* make sure this backend recongizes critical controls */
 289         rc = backend_check_controls( be, conn, op ) ;
 290
 291         if( rc != LDAP_SUCCESS ) {
 292                 send_ldap_result( conn, op, rc,
 293                         NULL, NULL, NULL, NULL );
 294         }
 295
 296         if ( be->be_bind ) {
 297                 int ret;
 298                 /* alias suffix */
 299                 char *edn = NULL;
 300
 301                 /* deref suffix alias if appropriate */
 302                 ndn = suffix_alias( be, ndn );
 303
 304                 ret = (*be->be_bind)( be, conn, op, dn, ndn,
 305                         method, mech, &cred, &edn );
 306
 307                 if ( ret == 0 ) {
 308                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 309
 310                         conn->c_cdn = dn;
 311                         dn = NULL;
 312
 313                         if(edn != NULL) {
 314                                 conn->c_dn = edn;
 315                         } else {
 316                                 conn->c_dn = ndn;
 317                                 ndn = NULL;
 318                         }
 319
 320                         Debug( LDAP_DEBUG_TRACE, "do_bind: bound \"%s\" to \"%s\"\n",
 321                         conn->c_cdn, conn->c_dn, method );
 322
 323                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 324
 325                         /* send this here to avoid a race condition */
 326                         send_ldap_result( conn, op, LDAP_SUCCESS,
 327                                 NULL, NULL, NULL, NULL );
 328
 329                 } else if (edn != NULL) {
 330                         free( edn );
 331                 }
 332
 333         } else {
 334                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 335                         NULL, "Function not implemented", NULL, NULL );
 336         }
 337
 338 cleanup:
 339         if( dn != NULL ) {
 340                 free( dn );
 341         }
 342         if( ndn != NULL ) {
 343                 free( ndn );
 344         }
 345         if ( mech != NULL ) {
 346                 free( mech );
 347         }
 348         if ( cred.bv_val != NULL ) {
 349                 free( cred.bv_val );
 350         }
 351
 352         return rc;
 353 }