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         /*
  58          * Force to connection to "anonymous" until bind succeeds.
  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_authc_backend = NULL;
  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, "requested protocol version not supported", NULL, NULL );
 176                 goto cleanup;
 177         }
 178
 179         /* we set connection version regardless of whether bind succeeds
 180          * or not.
 181          */
 182         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 183         conn->c_protocol = version;
 184         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 185
 186         if ( method == LDAP_AUTH_SASL ) {
 187                 if ( version < LDAP_VERSION3 ) {
 188                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 189                                 (unsigned long) version, 0, 0 );
 190                         send_ldap_disconnect( conn, op,
 191                                 LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
 192                         rc = SLAPD_DISCONNECT;
 193                         goto cleanup;
 194                 }
 195
 196                 if( mech == NULL || *mech == '\0' ) {
 197                         Debug( LDAP_DEBUG_ANY,
 198                                 "do_bind: no sasl mechanism provided\n",
 199                                 0, 0, 0 );
 200                         send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 201                                 NULL, "no SASL mechanism provided", NULL, NULL );
 202                         goto cleanup;
 203                 }
 204
 205                 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
 206                         Debug( LDAP_DEBUG_ANY,
 207                                 "do_bind: sasl mechanism=\"%s\" not supported.\n",
 208                                 mech, 0, 0 );
 209                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 210                                 NULL, "SASL mechanism not supported", NULL, NULL );
 211                         goto cleanup;
 212                 }
 213
 214                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 215
 216                 if ( conn->c_sasl_bind_mech != NULL ) {
 217                         assert( conn->c_sasl_bind_in_progress );
 218
 219                         if((strcmp(conn->c_sasl_bind_mech, mech) != 0)) {
 220                                 /* mechanism changed, cancel in progress bind */
 221                                 conn->c_sasl_bind_in_progress = 0;
 222                                 free( conn->c_sasl_bind_mech );
 223                                 conn->c_sasl_bind_mech = NULL;
 224 #ifdef HAVE_CYRUS_SASL
 225                                 sasl_dispose(&conn->c_sasl_bind_context);
 226                                 conn->c_sasl_bind_context = NULL;
 227 #endif
 228                         }
 229
 230 #ifdef LDAP_DEBUG
 231                 } else {
 232                         assert( !conn->c_sasl_bind_in_progress );
 233                         assert( conn->c_sasl_bind_mech == NULL );
 234 #ifdef HAVE_CYRUS_SASL
 235                         assert( conn->c_sasl_bind_context == NULL );
 236 #endif
 237 #endif
 238                 }
 239                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 240
 241         } else {
 242                 /* Not SASL, cancel any in-progress bind */
 243                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 244
 245                 if ( conn->c_sasl_bind_mech != NULL ) {
 246                         assert( conn->c_sasl_bind_in_progress );
 247
 248                         /* cancel in progress bind */
 249                         conn->c_sasl_bind_in_progress = 0;
 250
 251                         free(conn->c_sasl_bind_mech);
 252                         conn->c_sasl_bind_mech = NULL;
 253
 254 #ifdef HAVE_CYRUS_SASL
 255                         sasl_dispose(&conn->c_sasl_bind_context);
 256                         conn->c_sasl_bind_context = NULL;
 257 #endif
 258                 }
 259
 260                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 261         }
 262
 263         /* accept "anonymous" binds */
 264         if ( cred.bv_len == 0 || ndn == NULL || *ndn == '\0' ) {
 265                 /*
 266                  * we already forced connection to "anonymous",
 267                  * just need to send success
 268                  */
 269                 send_ldap_result( conn, op, LDAP_SUCCESS,
 270                         NULL, NULL, NULL, NULL );
 271                 Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
 272                         version, 0, 0 );
 273                 goto cleanup;
 274         }
 275
 276         /*
 277          * We could be serving multiple database backends.  Select the
 278          * appropriate one, or send a referral to our "referral server"
 279          * if we don't hold it.
 280          */
 281
 282         if ( (be = select_backend( ndn )) == NULL ) {
 283                 if ( default_referral ) {
 284                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 285                                 NULL, NULL, default_referral, NULL );
 286
 287                 } else {
 288                         /* noSuchObject is not allowed to be returned by bind */
 289                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 290                                 NULL, NULL, NULL, NULL );
 291                 }
 292
 293                 goto cleanup;
 294         }
 295
 296         conn->c_authz_backend = be;
 297
 298         /* make sure this backend recongizes critical controls */
 299         rc = backend_check_controls( be, conn, op, &text ) ;
 300
 301         if( rc != LDAP_SUCCESS ) {
 302                 send_ldap_result( conn, op, rc,
 303                         NULL, text, NULL, NULL );
 304                 goto cleanup;
 305         }
 306
 307         if ( be->be_bind ) {
 308                 int ret;
 309                 /* alias suffix */
 310                 char *edn = NULL;
 311
 312                 /* deref suffix alias if appropriate */
 313                 ndn = suffix_alias( be, ndn );
 314
 315                 ret = (*be->be_bind)( be, conn, op, dn, ndn,
 316                         method, mech, &cred, &edn );
 317
 318                 if ( ret == 0 ) {
 319                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 320
 321                         conn->c_cdn = dn;
 322                         dn = NULL;
 323
 324                         if(edn != NULL) {
 325                                 conn->c_dn = edn;
 326                         } else {
 327                                 conn->c_dn = ndn;
 328                                 ndn = NULL;
 329                         }
 330
 331                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d bind: \"%s\" to \"%s\"\n",
 332                         version, conn->c_cdn, conn->c_dn );
 333
 334                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 335
 336                         /* send this here to avoid a race condition */
 337                         send_ldap_result( conn, op, LDAP_SUCCESS,
 338                                 NULL, NULL, NULL, NULL );
 339
 340                 } else if (edn != NULL) {
 341                         free( edn );
 342                 }
 343
 344         } else {
 345                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 346                         NULL, "bind function not implemented", NULL, NULL );
 347         }
 348
 349 cleanup:
 350         if( dn != NULL ) {
 351                 free( dn );
 352         }
 353         if( ndn != NULL ) {
 354                 free( ndn );
 355         }
 356         if ( mech != NULL ) {
 357                 free( mech );
 358         }
 359         if ( cred.bv_val != NULL ) {
 360                 free( cred.bv_val );
 361         }
 362
 363         return rc;
 364 }