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 "slap.h"
  28
  29 int
  30 do_bind(
  31     Connection  *conn,
  32     Operation   *op
  33 )
  34 {
  35         BerElement      *ber = op->o_ber;
  36         ber_int_t               version;
  37         ber_tag_t method;
  38         char            *mech;
  39         char            *dn;
  40         char *ndn;
  41         ber_tag_t       tag;
  42         int                     rc = LDAP_SUCCESS;
  43         struct berval   cred;
  44         Backend         *be;
  45
  46         Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
  47
  48         dn = NULL;
  49         ndn = NULL;
  50         mech = NULL;
  51         cred.bv_val = NULL;
  52
  53         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
  54
  55         /* Force to connection to "anonymous" until bind succeeds.
  56          * This may need to be relocated or done on a case by case basis
  57          * to handle certain SASL mechanisms.
  58          */
  59
  60         if ( conn->c_cdn != NULL ) {
  61                 free( conn->c_cdn );
  62                 conn->c_cdn = NULL;
  63         }
  64
  65         if ( conn->c_dn != NULL ) {
  66                 free( conn->c_dn );
  67                 conn->c_dn = NULL;
  68         }
  69
  70         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
  71
  72         if ( op->o_dn != NULL ) {
  73                 free( op->o_dn );
  74                 op->o_dn = ch_strdup( "" );
  75         }
  76
  77         if ( op->o_ndn != NULL ) {
  78                 free( op->o_ndn );
  79                 op->o_ndn = ch_strdup( "" );
  80         }
  81
  82         /*
  83          * Parse the bind request.  It looks like this:
  84          *
  85          *      BindRequest ::= SEQUENCE {
  86          *              version         INTEGER,                 -- version
  87          *              name            DistinguishedName,       -- dn
  88          *              authentication  CHOICE {
  89          *                      simple          [0] OCTET STRING -- passwd
  90          *                      krbv42ldap      [1] OCTET STRING
  91          *                      krbv42dsa       [2] OCTET STRING
  92          *                      SASL            [3] SaslCredentials
  93          *              }
  94          *      }
  95          *
  96          *      SaslCredentials ::= SEQUENCE {
  97      *          mechanism           LDAPString,
  98      *          credentials         OCTET STRING OPTIONAL
  99          *      }
 100          */
 101
 102         tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
 103
 104         if ( tag == LBER_ERROR ) {
 105                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
 106                 send_ldap_disconnect( conn, op,
 107                         LDAP_PROTOCOL_ERROR, "decoding error" );
 108                 rc = -1;
 109                 goto cleanup;
 110         }
 111
 112         ndn = ch_strdup( dn );
 113
 114         if ( dn_normalize_case( ndn ) == NULL ) {
 115                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
 116                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 117                     "invalid DN", NULL, NULL );
 118                 goto cleanup;
 119         }
 120
 121         op->o_protocol = version;
 122
 123         if( method != LDAP_AUTH_SASL ) {
 124                 tag = ber_scanf( ber, /*{*/ "o}", &cred );
 125
 126         } else {
 127                 tag = ber_scanf( ber, "{a" /*}*/, &mech );
 128
 129                 if ( tag != LBER_ERROR ) {
 130                         ber_len_t len;
 131                         tag = ber_peek_tag( ber, &len );
 132
 133                         if ( tag == LDAP_TAG_LDAPCRED ) {
 134                                 tag = ber_scanf( ber, "o", &cred );
 135                         }
 136
 137                         if ( tag != LBER_ERROR ) {
 138                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 139                         }
 140                 }
 141         }
 142
 143         if ( tag == LBER_ERROR ) {
 144                 send_ldap_disconnect( conn, op,
 145                         LDAP_PROTOCOL_ERROR,
 146                 "decoding error" );
 147                 rc = -1;
 148                 goto cleanup;
 149         }
 150
 151         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 152                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 153                 goto cleanup;
 154         }
 155
 156         if( method == LDAP_AUTH_SASL ) {
 157                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 158                         dn, mech, NULL );
 159         } else {
 160                 Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 161                         (unsigned long) version, dn, (unsigned long) method );
 162         }
 163
 164         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 165             op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
 166
 167         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 168                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 169                         (unsigned long) version, 0, 0 );
 170                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 171                         NULL, "version not supported", NULL, NULL );
 172                 goto cleanup;
 173         }
 174
 175         if ( method == LDAP_AUTH_SASL ) {
 176                 if ( version < LDAP_VERSION3 ) {
 177                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 178                                 (unsigned long) version, 0, 0 );
 179                         send_ldap_disconnect( conn, op,
 180                                 LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
 181                         rc = -1;
 182                         goto cleanup;
 183                 }
 184
 185                 if( mech == NULL || *mech == '\0' ) {
 186                         Debug( LDAP_DEBUG_ANY,
 187                                 "do_bind: no sasl mechanism provided\n",
 188                                 0, 0, 0 );
 189                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 190                                 NULL, "no sasl mechanism provided", NULL, NULL );
 191                         goto cleanup;
 192                 }
 193
 194                 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
 195                         Debug( LDAP_DEBUG_ANY,
 196                                 "do_bind: sasl mechanism=\"%s\" not supported.\n",
 197                                 mech, 0, 0 );
 198                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 199                                 NULL, "sasl mechanism not supported", NULL, NULL );
 200                         goto cleanup;
 201                 }
 202
 203                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 204
 205                 if ( conn->c_authmech != NULL ) {
 206                         assert( conn->c_bind_in_progress );
 207
 208                         if((strcmp(conn->c_authmech, mech) != 0)) {
 209                                 /* mechanism changed, cancel in progress bind */
 210                                 conn->c_bind_in_progress = 0;
 211                                 if( conn->c_authstate != NULL ) {
 212                                         free(conn->c_authstate);
 213                                         conn->c_authstate = NULL;
 214                                 }
 215                                 free(conn->c_authmech);
 216                                 conn->c_authmech = NULL;
 217                         }
 218
 219 #ifdef LDAP_DEBUG
 220                 } else {
 221                         assert( !conn->c_bind_in_progress );
 222                         assert( conn->c_authmech == NULL );
 223                         assert( conn->c_authstate == NULL );
 224 #endif
 225                 }
 226
 227         } else {
 228                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 229
 230                 if ( conn->c_authmech != NULL ) {
 231                         assert( conn->c_bind_in_progress );
 232
 233                         /* cancel in progress bind */
 234                         conn->c_bind_in_progress = 0;
 235
 236                         if( conn->c_authstate != NULL ) {
 237                                 free(conn->c_authstate);
 238                                 conn->c_authstate = NULL;
 239                         }
 240                         free(conn->c_authmech);
 241                         conn->c_authmech = NULL;
 242                 }
 243         }
 244
 245         conn->c_protocol = version;
 246         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 247
 248         /* accept null binds */
 249         if ( ndn == NULL || *ndn == '\0' ) {
 250                 /*
 251                  * we already forced connection to "anonymous", we just
 252                  * need to send success
 253                  */
 254                 send_ldap_result( conn, op, LDAP_SUCCESS,
 255                         NULL, NULL, NULL, NULL );
 256                 goto cleanup;
 257         }
 258
 259         /*
 260          * We could be serving multiple database backends.  Select the
 261          * appropriate one, or send a referral to our "referral server"
 262          * if we don't hold it.
 263          */
 264
 265         if ( (be = select_backend( ndn )) == NULL ) {
 266                 if ( cred.bv_len == 0 ) {
 267                         send_ldap_result( conn, op, LDAP_SUCCESS,
 268                                 NULL, NULL, NULL, NULL );
 269
 270                 } else if ( default_referral ) {
 271                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 272                                 NULL, NULL, default_referral, NULL );
 273
 274                 } else {
 275                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 276                                 NULL, NULL, NULL, NULL );
 277                 }
 278
 279                 goto cleanup;
 280         }
 281
 282         if ( be->be_bind ) {
 283                 /* alias suffix */
 284                 char *edn;
 285
 286                 /* deref suffix alias if appropriate */
 287                 ndn = suffix_alias( be, ndn );
 288
 289                 if ( (*be->be_bind)( be, conn, op, ndn, method, mech, &cred, &edn ) == 0 ) {
 290                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 291
 292                         conn->c_cdn = dn;
 293                         dn = NULL;
 294
 295                         if(edn != NULL) {
 296                                 conn->c_dn = edn;
 297                         } else {
 298                                 conn->c_dn = ndn;
 299                                 ndn = NULL;
 300                         }
 301
 302                         Debug( LDAP_DEBUG_TRACE, "do_bind: bound \"%s\" to \"%s\"\n",
 303                         conn->c_cdn, conn->c_dn, method );
 304
 305                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 306
 307                         /* send this here to avoid a race condition */
 308                         send_ldap_result( conn, op, LDAP_SUCCESS,
 309                                 NULL, NULL, NULL, NULL );
 310
 311                 } else if (edn != NULL) {
 312                         free( edn );
 313                 }
 314
 315         } else {
 316                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 317                         NULL, "Function not implemented", NULL, NULL );
 318         }
 319
 320 cleanup:
 321         if( dn != NULL ) {
 322                 free( dn );
 323         }
 324         if( ndn != NULL ) {
 325                 free( ndn );
 326         }
 327         if ( mech != NULL ) {
 328                 free( mech );
 329         }
 330         if ( cred.bv_val != NULL ) {
 331                 free( cred.bv_val );
 332         }
 333
 334         return rc;
 335 }