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                 char *edn;
 188
 189                 if ( version < LDAP_VERSION3 ) {
 190                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 191                                 (unsigned long) version, 0, 0 );
 192                         send_ldap_disconnect( conn, op,
 193                                 LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
 194                         rc = SLAPD_DISCONNECT;
 195                         goto cleanup;
 196                 }
 197
 198                 if( mech == NULL || *mech == '\0' ) {
 199                         Debug( LDAP_DEBUG_ANY,
 200                                 "do_bind: no sasl mechanism provided\n",
 201                                 0, 0, 0 );
 202                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 203                                 NULL, "no SASL mechanism provided", NULL, NULL );
 204                         goto cleanup;
 205                 }
 206
 207                 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
 208                         Debug( LDAP_DEBUG_ANY,
 209                                 "do_bind: sasl mechanism=\"%s\" not supported.\n",
 210                                 mech, 0, 0 );
 211                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 212                                 NULL, "SASL mechanism not supported", NULL, NULL );
 213                         goto cleanup;
 214                 }
 215
 216                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 217
 218                 if ( conn->c_sasl_bind_mech != NULL ) {
 219                         if((strcmp(conn->c_sasl_bind_mech, mech) != 0)) {
 220                                 /* mechanism changed, cancel in progress bind */
 221 #ifdef HAVE_CYRUS_SASL
 222                                 sasl_dispose(&conn->c_sasl_bind_context);
 223                                 conn->c_sasl_bind_context = NULL;
 224 #endif
 225                         }
 226                         free( conn->c_sasl_bind_mech );
 227                         conn->c_sasl_bind_mech = NULL;
 228
 229 #ifdef LDAP_DEBUG
 230 #ifdef HAVE_CYRUS_SASL
 231                 } else {
 232                         assert( conn->c_sasl_bind_context == NULL );
 233 #endif
 234 #endif
 235                 }
 236
 237                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 238
 239                 edn = NULL;
 240                 rc = sasl_bind( conn, op, dn, ndn, mech, &cred, &edn );
 241
 242                 if( rc == LDAP_SUCCESS && edn != NULL ) {
 243                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 244 #ifdef HAVE_CYRUS_SASL
 245                         assert( conn->c_sasl_bind_context == NULL );
 246 #endif
 247                         conn->c_dn = edn;
 248                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 249
 250                 } else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 251 #ifdef HAVE_CYRUS_SASL
 252                         assert( conn->c_sasl_bind_context != NULL );
 253 #endif
 254                         conn->c_sasl_bind_mech = mech;
 255                         mech = NULL;
 256
 257 #ifdef HAVE_CYRUS_SASL
 258                 } else {
 259                         assert( conn->c_sasl_bind_context != NULL );
 260 #endif
 261                 }
 262
 263                 goto cleanup;
 264
 265         } else {
 266                 /* Not SASL, cancel any in-progress bind */
 267                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 268
 269                 if ( conn->c_sasl_bind_mech != NULL ) {
 270                         assert( conn->c_sasl_bind_in_progress );
 271
 272                         free(conn->c_sasl_bind_mech);
 273                         conn->c_sasl_bind_mech = NULL;
 274
 275 #ifdef HAVE_CYRUS_SASL
 276                         assert( conn->c_sasl_bind_context != NULL );
 277                         sasl_dispose(&conn->c_sasl_bind_context);
 278                         conn->c_sasl_bind_context = NULL;
 279 #endif
 280                 } else {
 281                         assert( !conn->c_sasl_bind_in_progress );
 282 #ifdef HAVE_CYRUS_SASL
 283                         assert( conn->c_sasl_bind_context == NULL );
 284 #endif
 285                 }
 286
 287                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 288         }
 289
 290         /* accept "anonymous" binds */
 291         if ( cred.bv_len == 0 || ndn == NULL || *ndn == '\0' ) {
 292                 /*
 293                  * we already forced connection to "anonymous",
 294                  * just need to send success
 295                  */
 296                 send_ldap_result( conn, op, LDAP_SUCCESS,
 297                         NULL, NULL, NULL, NULL );
 298                 Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
 299                         version, 0, 0 );
 300                 goto cleanup;
 301         }
 302
 303         /*
 304          * We could be serving multiple database backends.  Select the
 305          * appropriate one, or send a referral to our "referral server"
 306          * if we don't hold it.
 307          */
 308
 309         if ( (be = select_backend( ndn )) == NULL ) {
 310                 if ( default_referral ) {
 311                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 312                                 NULL, NULL, default_referral, NULL );
 313
 314                 } else {
 315                         /* noSuchObject is not allowed to be returned by bind */
 316                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 317                                 NULL, NULL, NULL, NULL );
 318                 }
 319
 320                 goto cleanup;
 321         }
 322
 323         conn->c_authz_backend = be;
 324
 325         /* make sure this backend recongizes critical controls */
 326         rc = backend_check_controls( be, conn, op, &text ) ;
 327
 328         if( rc != LDAP_SUCCESS ) {
 329                 send_ldap_result( conn, op, rc,
 330                         NULL, text, NULL, NULL );
 331                 goto cleanup;
 332         }
 333
 334         if ( be->be_bind ) {
 335                 int ret;
 336                 /* alias suffix */
 337                 char *edn = NULL;
 338
 339                 /* deref suffix alias if appropriate */
 340                 ndn = suffix_alias( be, ndn );
 341
 342                 ret = (*be->be_bind)( be, conn, op, dn, ndn,
 343                         method, mech, &cred, &edn );
 344
 345                 if ( ret == 0 ) {
 346                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 347
 348                         conn->c_cdn = dn;
 349                         dn = NULL;
 350
 351                         if(edn != NULL) {
 352                                 conn->c_dn = edn;
 353                         } else {
 354                                 conn->c_dn = ndn;
 355                                 ndn = NULL;
 356                         }
 357
 358                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d bind: \"%s\" to \"%s\"\n",
 359                         version, conn->c_cdn, conn->c_dn );
 360
 361                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 362
 363                         /* send this here to avoid a race condition */
 364                         send_ldap_result( conn, op, LDAP_SUCCESS,
 365                                 NULL, NULL, NULL, NULL );
 366
 367                 } else if (edn != NULL) {
 368                         free( edn );
 369                 }
 370
 371         } else {
 372                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 373                         NULL, "bind function not implemented", NULL, NULL );
 374         }
 375
 376 cleanup:
 377         if( dn != NULL ) {
 378                 free( dn );
 379         }
 380         if( ndn != NULL ) {
 381                 free( ndn );
 382         }
 383         if ( mech != NULL ) {
 384                 free( mech );
 385         }
 386         if ( cred.bv_val != NULL ) {
 387                 free( cred.bv_val );
 388         }
 389
 390         return rc;
 391 }