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         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         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
  56
  57         /* Force to connection to "anonymous" until bind succeeds.
  58          * This may need to be relocated or done on a case by case basis
  59          * to handle certain SASL mechanisms.
  60          */
  61
  62         if ( conn->c_cdn != NULL ) {
  63                 free( conn->c_cdn );
  64                 conn->c_cdn = NULL;
  65         }
  66
  67         if ( conn->c_dn != NULL ) {
  68                 free( conn->c_dn );
  69                 conn->c_dn = NULL;
  70         }
  71
  72         conn->c_authz_backend = NULL;
  73
  74         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
  75
  76         if ( op->o_dn != NULL ) {
  77                 free( op->o_dn );
  78                 op->o_dn = ch_strdup( "" );
  79         }
  80
  81         if ( op->o_ndn != NULL ) {
  82                 free( op->o_ndn );
  83                 op->o_ndn = ch_strdup( "" );
  84         }
  85
  86         /*
  87          * Parse the bind request.  It looks like this:
  88          *
  89          *      BindRequest ::= SEQUENCE {
  90          *              version         INTEGER,                 -- version
  91          *              name            DistinguishedName,       -- dn
  92          *              authentication  CHOICE {
  93          *                      simple          [0] OCTET STRING -- passwd
  94          *                      krbv42ldap      [1] OCTET STRING
  95          *                      krbv42dsa       [2] OCTET STRING
  96          *                      SASL            [3] SaslCredentials
  97          *              }
  98          *      }
  99          *
 100          *      SaslCredentials ::= SEQUENCE {
 101      *          mechanism           LDAPString,
 102      *          credentials         OCTET STRING OPTIONAL
 103          *      }
 104          */
 105
 106         tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
 107
 108         if ( tag == LBER_ERROR ) {
 109                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
 110                 send_ldap_disconnect( conn, op,
 111                         LDAP_PROTOCOL_ERROR, "decoding error" );
 112                 rc = -1;
 113                 goto cleanup;
 114         }
 115
 116         op->o_protocol = version;
 117
 118         if( method != LDAP_AUTH_SASL ) {
 119                 tag = ber_scanf( ber, /*{*/ "o}", &cred );
 120
 121         } else {
 122                 tag = ber_scanf( ber, "{a" /*}*/, &mech );
 123
 124                 if ( tag != LBER_ERROR ) {
 125                         ber_len_t len;
 126                         tag = ber_peek_tag( ber, &len );
 127
 128                         if ( tag == LDAP_TAG_LDAPCRED ) {
 129                                 tag = ber_scanf( ber, "o", &cred );
 130                         }
 131
 132                         if ( tag != LBER_ERROR ) {
 133                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 134                         }
 135                 }
 136         }
 137
 138         if ( tag == LBER_ERROR ) {
 139                 send_ldap_disconnect( conn, op,
 140                         LDAP_PROTOCOL_ERROR,
 141                 "decoding error" );
 142                 rc = SLAPD_DISCONNECT;
 143                 goto cleanup;
 144         }
 145
 146         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 147                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 148                 goto cleanup;
 149         }
 150
 151         ndn = ch_strdup( dn );
 152
 153         if ( dn_normalize( ndn ) == NULL ) {
 154                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
 155                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 156                     "invalid DN", NULL, NULL );
 157                 goto cleanup;
 158         }
 159
 160         if( method == LDAP_AUTH_SASL ) {
 161                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 162                         dn, mech, NULL );
 163         } else {
 164                 Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 165                         (unsigned long) version, dn, (unsigned long) method );
 166         }
 167
 168         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 169             op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
 170
 171         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 172                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 173                         (unsigned long) version, 0, 0 );
 174                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 175                         NULL, "version not supported", NULL, NULL );
 176                 goto cleanup;
 177         }
 178
 179         if ( method == LDAP_AUTH_SASL ) {
 180                 if ( version < LDAP_VERSION3 ) {
 181                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 182                                 (unsigned long) version, 0, 0 );
 183                         send_ldap_disconnect( conn, op,
 184                                 LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
 185                         rc = SLAPD_DISCONNECT;
 186                         goto cleanup;
 187                 }
 188
 189                 if( mech == NULL || *mech == '\0' ) {
 190                         Debug( LDAP_DEBUG_ANY,
 191                                 "do_bind: no sasl mechanism provided\n",
 192                                 0, 0, 0 );
 193                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 194                                 NULL, "no sasl mechanism provided", NULL, NULL );
 195                         goto cleanup;
 196                 }
 197
 198                 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
 199                         Debug( LDAP_DEBUG_ANY,
 200                                 "do_bind: sasl mechanism=\"%s\" not supported.\n",
 201                                 mech, 0, 0 );
 202                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 203                                 NULL, "sasl mechanism not supported", NULL, NULL );
 204                         goto cleanup;
 205                 }
 206
 207                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 208
 209                 if ( conn->c_authmech != NULL ) {
 210                         assert( conn->c_bind_in_progress );
 211
 212                         if((strcmp(conn->c_authmech, mech) != 0)) {
 213                                 /* mechanism changed, cancel in progress bind */
 214                                 conn->c_bind_in_progress = 0;
 215                                 if( conn->c_authstate != NULL ) {
 216                                         free(conn->c_authstate);
 217                                         conn->c_authstate = NULL;
 218                                 }
 219                                 free(conn->c_authmech);
 220                                 conn->c_authmech = NULL;
 221                         }
 222
 223 #ifdef LDAP_DEBUG
 224                 } else {
 225                         assert( !conn->c_bind_in_progress );
 226                         assert( conn->c_authmech == NULL );
 227                         assert( conn->c_authstate == NULL );
 228 #endif
 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, &text ) ;
 290
 291         if( rc != LDAP_SUCCESS ) {
 292                 send_ldap_result( conn, op, rc,
 293                         NULL, text, NULL, NULL );
 294                 goto cleanup;
 295         }
 296
 297         if ( be->be_bind ) {
 298                 int ret;
 299                 /* alias suffix */
 300                 char *edn = NULL;
 301
 302                 /* deref suffix alias if appropriate */
 303                 ndn = suffix_alias( be, ndn );
 304
 305                 ret = (*be->be_bind)( be, conn, op, dn, ndn,
 306                         method, mech, &cred, &edn );
 307
 308                 if ( ret == 0 ) {
 309 #ifdef HAVE_CYRUS_SASL
 310                         int ssf = 0;
 311 #endif
 312
 313                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 314
 315                         conn->c_cdn = dn;
 316                         dn = NULL;
 317
 318                         if(edn != NULL) {
 319                                 conn->c_dn = edn;
 320                         } else {
 321                                 conn->c_dn = ndn;
 322                                 ndn = NULL;
 323                         }
 324
 325                         Debug( LDAP_DEBUG_TRACE, "do_bind: bound \"%s\" to \"%s\"\n",
 326                         conn->c_cdn, conn->c_dn, method );
 327
 328                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 329
 330                         /* send this here to avoid a race condition */
 331                         send_ldap_result( conn, op, LDAP_SUCCESS,
 332                                 NULL, NULL, NULL, NULL );
 333
 334 #ifdef HAVE_CYRUS_SASL
 335                         if ( conn->c_sasl_context != NULL &&
 336                                 sasl_getprop( conn->c_sasl_context, SASL_SSF, (void **)&ssf )
 337                                         == SASL_OK && ssf ) {
 338                                 /* Enable encode/decode */
 339                                 ldap_pvt_sasl_install( conn->c_sb, conn->c_sasl_context );
 340                         }
 341 #endif
 342                 } else if (edn != NULL) {
 343                         free( edn );
 344                 }
 345
 346         } else {
 347                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 348                         NULL, "Function not implemented", NULL, NULL );
 349         }
 350
 351 cleanup:
 352         if( dn != NULL ) {
 353                 free( dn );
 354         }
 355         if( ndn != NULL ) {
 356                 free( ndn );
 357         }
 358         if ( mech != NULL ) {
 359                 free( mech );
 360         }
 361         if ( cred.bv_val != NULL ) {
 362                 free( cred.bv_val );
 363         }
 364
 365         return rc;
 366 }