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         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
  72
  73         if ( op->o_dn != NULL ) {
  74                 free( op->o_dn );
  75                 op->o_dn = ch_strdup( "" );
  76         }
  77
  78         if ( op->o_ndn != NULL ) {
  79                 free( op->o_ndn );
  80                 op->o_ndn = ch_strdup( "" );
  81         }
  82
  83         /*
  84          * Parse the bind request.  It looks like this:
  85          *
  86          *      BindRequest ::= SEQUENCE {
  87          *              version         INTEGER,                 -- version
  88          *              name            DistinguishedName,       -- dn
  89          *              authentication  CHOICE {
  90          *                      simple          [0] OCTET STRING -- passwd
  91          *                      krbv42ldap      [1] OCTET STRING
  92          *                      krbv42dsa       [2] OCTET STRING
  93          *                      SASL            [3] SaslCredentials
  94          *              }
  95          *      }
  96          *
  97          *      SaslCredentials ::= SEQUENCE {
  98      *          mechanism           LDAPString,
  99      *          credentials         OCTET STRING OPTIONAL
 100          *      }
 101          */
 102
 103         tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
 104
 105         if ( tag == LBER_ERROR ) {
 106                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
 107                 send_ldap_disconnect( conn, op,
 108                         LDAP_PROTOCOL_ERROR, "decoding error" );
 109                 rc = -1;
 110                 goto cleanup;
 111         }
 112
 113         ndn = ch_strdup( dn );
 114
 115         if ( dn_normalize( ndn ) == NULL ) {
 116                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
 117                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 118                     "invalid DN", NULL, NULL );
 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 = -1;
 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         if( method == LDAP_AUTH_SASL ) {
 158                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 159                         dn, mech, NULL );
 160         } else {
 161                 Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 162                         (unsigned long) version, dn, (unsigned long) method );
 163         }
 164
 165         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 166             op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
 167
 168         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 169                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 170                         (unsigned long) version, 0, 0 );
 171                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 172                         NULL, "version not supported", NULL, NULL );
 173                 goto cleanup;
 174         }
 175
 176         if ( method == LDAP_AUTH_SASL ) {
 177                 if ( version < LDAP_VERSION3 ) {
 178                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 179                                 (unsigned long) version, 0, 0 );
 180                         send_ldap_disconnect( conn, op,
 181                                 LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
 182                         rc = -1;
 183                         goto cleanup;
 184                 }
 185
 186                 if( mech == NULL || *mech == '\0' ) {
 187                         Debug( LDAP_DEBUG_ANY,
 188                                 "do_bind: no sasl mechanism provided\n",
 189                                 0, 0, 0 );
 190                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 191                                 NULL, "no sasl mechanism provided", NULL, NULL );
 192                         goto cleanup;
 193                 }
 194
 195                 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
 196                         Debug( LDAP_DEBUG_ANY,
 197                                 "do_bind: sasl mechanism=\"%s\" not supported.\n",
 198                                 mech, 0, 0 );
 199                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 200                                 NULL, "sasl mechanism not supported", NULL, NULL );
 201                         goto cleanup;
 202                 }
 203
 204                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 205
 206                 if ( conn->c_authmech != NULL ) {
 207                         assert( conn->c_bind_in_progress );
 208
 209                         if((strcmp(conn->c_authmech, mech) != 0)) {
 210                                 /* mechanism changed, cancel in progress bind */
 211                                 conn->c_bind_in_progress = 0;
 212                                 if( conn->c_authstate != NULL ) {
 213                                         free(conn->c_authstate);
 214                                         conn->c_authstate = NULL;
 215                                 }
 216                                 free(conn->c_authmech);
 217                                 conn->c_authmech = NULL;
 218                         }
 219
 220 #ifdef LDAP_DEBUG
 221                 } else {
 222                         assert( !conn->c_bind_in_progress );
 223                         assert( conn->c_authmech == NULL );
 224                         assert( conn->c_authstate == NULL );
 225 #endif
 226                 }
 227
 228         } else {
 229                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 230
 231                 if ( conn->c_authmech != NULL ) {
 232                         assert( conn->c_bind_in_progress );
 233
 234                         /* cancel in progress bind */
 235                         conn->c_bind_in_progress = 0;
 236
 237                         if( conn->c_authstate != NULL ) {
 238                                 free(conn->c_authstate);
 239                                 conn->c_authstate = NULL;
 240                         }
 241                         free(conn->c_authmech);
 242                         conn->c_authmech = NULL;
 243                 }
 244         }
 245
 246         conn->c_protocol = version;
 247         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 248
 249         /* accept null binds */
 250         if ( ndn == NULL || *ndn == '\0' ) {
 251                 /*
 252                  * we already forced connection to "anonymous", we just
 253                  * need to send success
 254                  */
 255                 send_ldap_result( conn, op, LDAP_SUCCESS,
 256                         NULL, NULL, NULL, NULL );
 257                 goto cleanup;
 258         }
 259
 260         /*
 261          * We could be serving multiple database backends.  Select the
 262          * appropriate one, or send a referral to our "referral server"
 263          * if we don't hold it.
 264          */
 265
 266         if ( (be = select_backend( ndn )) == NULL ) {
 267                 if ( cred.bv_len == 0 ) {
 268                         send_ldap_result( conn, op, LDAP_SUCCESS,
 269                                 NULL, NULL, NULL, NULL );
 270
 271                 } else if ( default_referral ) {
 272                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 273                                 NULL, NULL, default_referral, NULL );
 274
 275                 } else {
 276                         /* noSuchObject is not allowed to be returned by bind */
 277                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 278                                 NULL, NULL, NULL, NULL );
 279                 }
 280
 281                 goto cleanup;
 282         }
 283
 284         if ( be->be_bind ) {
 285                 /* alias suffix */
 286                 char *edn = NULL;
 287
 288                 /* deref suffix alias if appropriate */
 289                 ndn = suffix_alias( be, ndn );
 290
 291                 if ( (*be->be_bind)( be, conn, op, dn, ndn, method, mech, &cred, &edn ) == 0 ) {
 292                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 293
 294                         conn->c_cdn = dn;
 295                         dn = NULL;
 296
 297                         if(edn != NULL) {
 298                                 conn->c_dn = edn;
 299                         } else {
 300                                 conn->c_dn = ndn;
 301                                 ndn = NULL;
 302                         }
 303
 304                         Debug( LDAP_DEBUG_TRACE, "do_bind: bound \"%s\" to \"%s\"\n",
 305                         conn->c_cdn, conn->c_dn, method );
 306
 307                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 308
 309                         /* send this here to avoid a race condition */
 310                         send_ldap_result( conn, op, LDAP_SUCCESS,
 311                                 NULL, NULL, NULL, NULL );
 312
 313                 } else if (edn != NULL) {
 314                         free( edn );
 315                 }
 316
 317         } else {
 318                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 319                         NULL, "Function not implemented", NULL, NULL );
 320         }
 321
 322 cleanup:
 323         if( dn != NULL ) {
 324                 free( dn );
 325         }
 326         if( ndn != NULL ) {
 327                 free( ndn );
 328         }
 329         if ( mech != NULL ) {
 330                 free( mech );
 331         }
 332         if ( cred.bv_val != NULL ) {
 333                 free( cred.bv_val );
 334         }
 335
 336         return rc;
 337 }