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 1998-2000 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            *saslmech;
  41         char            *dn;
  42         char *ndn;
  43         ber_tag_t       tag;
  44         int                     rc = LDAP_SUCCESS;
  45         const char      *text;
  46         struct berval   cred;
  47         Backend         *be;
  48
  49         Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
  50
  51         dn = NULL;
  52         ndn = NULL;
  53         mech = NULL;
  54         cred.bv_val = NULL;
  55
  56         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
  57
  58         /*
  59          * Force to connection to "anonymous" until bind succeeds.
  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_authc_backend = NULL;
  73         conn->c_authz_backend = NULL;
  74
  75         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
  76
  77         if ( op->o_dn != NULL ) {
  78                 free( op->o_dn );
  79                 op->o_dn = ch_strdup( "" );
  80         }
  81
  82         if ( op->o_ndn != NULL ) {
  83                 free( op->o_ndn );
  84                 op->o_ndn = ch_strdup( "" );
  85         }
  86
  87         /*
  88          * Parse the bind request.  It looks like this:
  89          *
  90          *      BindRequest ::= SEQUENCE {
  91          *              version         INTEGER,                 -- version
  92          *              name            DistinguishedName,       -- dn
  93          *              authentication  CHOICE {
  94          *                      simple          [0] OCTET STRING -- passwd
  95          *                      krbv42ldap      [1] OCTET STRING
  96          *                      krbv42dsa       [2] OCTET STRING
  97          *                      SASL            [3] SaslCredentials
  98          *              }
  99          *      }
 100          *
 101          *      SaslCredentials ::= SEQUENCE {
 102      *          mechanism           LDAPString,
 103      *          credentials         OCTET STRING OPTIONAL
 104          *      }
 105          */
 106
 107         tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
 108
 109         if ( tag == LBER_ERROR ) {
 110                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
 111                 send_ldap_disconnect( conn, op,
 112                         LDAP_PROTOCOL_ERROR, "decoding error" );
 113                 rc = -1;
 114                 goto cleanup;
 115         }
 116
 117         op->o_protocol = version;
 118
 119         if( method != LDAP_AUTH_SASL ) {
 120                 tag = ber_scanf( ber, /*{*/ "o}", &cred );
 121
 122         } else {
 123                 tag = ber_scanf( ber, "{a" /*}*/, &mech );
 124
 125                 if ( tag != LBER_ERROR ) {
 126                         ber_len_t len;
 127                         tag = ber_peek_tag( ber, &len );
 128
 129                         if ( tag == LDAP_TAG_LDAPCRED ) {
 130                                 tag = ber_scanf( ber, "o", &cred );
 131                         }
 132
 133                         if ( tag != LBER_ERROR ) {
 134                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 135                         }
 136                 }
 137         }
 138
 139         if ( tag == LBER_ERROR ) {
 140                 send_ldap_disconnect( conn, op,
 141                         LDAP_PROTOCOL_ERROR,
 142                 "decoding error" );
 143                 rc = SLAPD_DISCONNECT;
 144                 goto cleanup;
 145         }
 146
 147         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 148                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 149                 goto cleanup;
 150         }
 151
 152         ndn = ch_strdup( dn );
 153
 154         if ( dn_normalize( ndn ) == NULL ) {
 155                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
 156                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 157                     "invalid DN", NULL, NULL );
 158                 goto cleanup;
 159         }
 160
 161         if( method == LDAP_AUTH_SASL ) {
 162                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 163                         dn, mech, NULL );
 164         } else {
 165                 Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 166                         (unsigned long) version, dn, (unsigned long) method );
 167         }
 168
 169         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 170             op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
 171
 172         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 173                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 174                         (unsigned long) version, 0, 0 );
 175                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 176                         NULL, "requested protocol version not supported", NULL, NULL );
 177                 goto cleanup;
 178         }
 179
 180         /* we set connection version regardless of whether bind succeeds
 181          * or not.
 182          */
 183         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 184         conn->c_protocol = version;
 185         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 186
 187         if ( method == LDAP_AUTH_SASL ) {
 188                 char *edn;
 189
 190                 if ( version < LDAP_VERSION3 ) {
 191                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 192                                 (unsigned long) version, 0, 0 );
 193                         send_ldap_disconnect( conn, op,
 194                                 LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
 195                         rc = SLAPD_DISCONNECT;
 196                         goto cleanup;
 197                 }
 198
 199                 if( mech == NULL || *mech == '\0' ) {
 200                         Debug( LDAP_DEBUG_ANY,
 201                                 "do_bind: no sasl mechanism provided\n",
 202                                 0, 0, 0 );
 203                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 204                                 NULL, "no SASL mechanism provided", NULL, NULL );
 205                         goto cleanup;
 206                 }
 207
 208                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 209
 210                 if ( conn->c_sasl_bind_mech != NULL ) {
 211                         /* SASL bind is in progress */
 212                         saslmech = NULL;
 213
 214                         if((strcmp(conn->c_sasl_bind_mech, mech) != 0)) {
 215                                 /* mechanism changed */
 216                                 slap_sasl_reset(conn);
 217                         }
 218
 219                         free( conn->c_sasl_bind_mech );
 220                         conn->c_sasl_bind_mech = NULL;
 221
 222 #ifdef LDAP_DEBUG
 223                 } else {
 224                         /* SASL bind is NOT in progress */
 225                         saslmech = mech;
 226                         assert( conn->c_sasl_bind_mech == NULL );
 227 #endif
 228                 }
 229
 230                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 231
 232                 edn = NULL;
 233                 rc = slap_sasl_bind( conn, op, dn, ndn, saslmech, &cred, &edn );
 234
 235                 if( rc == LDAP_SUCCESS ) {
 236                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 237                         conn->c_dn = edn;
 238                         conn->c_authmech = mech;
 239                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 240
 241                 } else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 242                         conn->c_sasl_bind_mech = mech;
 243                 }
 244
 245                 mech = NULL;
 246
 247                 goto cleanup;
 248
 249         } else {
 250                 /* Not SASL, cancel any in-progress bind */
 251                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 252
 253                 if ( conn->c_sasl_bind_mech != NULL ) {
 254                         assert( conn->c_sasl_bind_in_progress );
 255
 256                         free(conn->c_sasl_bind_mech);
 257                         conn->c_sasl_bind_mech = NULL;
 258
 259                 } else {
 260                         assert( !conn->c_sasl_bind_in_progress );
 261                 }
 262
 263                 slap_sasl_reset( conn );
 264                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 265         }
 266
 267         /* accept "anonymous" binds */
 268         if ( cred.bv_len == 0 || ndn == NULL || *ndn == '\0' ) {
 269                 /*
 270                  * we already forced connection to "anonymous",
 271                  * just need to send success
 272                  */
 273                 send_ldap_result( conn, op, LDAP_SUCCESS,
 274                         NULL, NULL, NULL, NULL );
 275                 Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
 276                         version, 0, 0 );
 277                 goto cleanup;
 278         }
 279
 280         /*
 281          * We could be serving multiple database backends.  Select the
 282          * appropriate one, or send a referral to our "referral server"
 283          * if we don't hold it.
 284          */
 285
 286         if ( (be = select_backend( ndn )) == NULL ) {
 287                 if ( default_referral ) {
 288                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 289                                 NULL, NULL, default_referral, NULL );
 290
 291                 } else {
 292                         /* noSuchObject is not allowed to be returned by bind */
 293                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 294                                 NULL, NULL, NULL, NULL );
 295                 }
 296
 297                 goto cleanup;
 298         }
 299
 300         conn->c_authz_backend = be;
 301
 302         /* make sure this backend recongizes critical controls */
 303         rc = backend_check_controls( be, conn, op, &text ) ;
 304
 305         if( rc != LDAP_SUCCESS ) {
 306                 send_ldap_result( conn, op, rc,
 307                         NULL, text, NULL, NULL );
 308                 goto cleanup;
 309         }
 310
 311         if ( be->be_bind ) {
 312                 int ret;
 313                 /* alias suffix */
 314                 char *edn = NULL;
 315
 316                 /* deref suffix alias if appropriate */
 317                 ndn = suffix_alias( be, ndn );
 318
 319                 ret = (*be->be_bind)( be, conn, op, dn, ndn,
 320                         method, &cred, &edn );
 321
 322                 if ( ret == 0 ) {
 323                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 324
 325                         conn->c_cdn = dn;
 326                         dn = NULL;
 327
 328                         if(edn != NULL) {
 329                                 conn->c_dn = edn;
 330                         } else {
 331                                 conn->c_dn = ndn;
 332                                 ndn = NULL;
 333                         }
 334
 335                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d bind: \"%s\" to \"%s\"\n",
 336                         version, conn->c_cdn, conn->c_dn );
 337
 338                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 339
 340                         /* send this here to avoid a race condition */
 341                         send_ldap_result( conn, op, LDAP_SUCCESS,
 342                                 NULL, NULL, NULL, NULL );
 343
 344                 } else if (edn != NULL) {
 345                         free( edn );
 346                 }
 347
 348         } else {
 349                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 350                         NULL, "operation not supported within namingContext", NULL, NULL );
 351         }
 352
 353 cleanup:
 354         if( rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 355                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 356
 357                 /* dispose of mech */
 358                 free( conn->c_sasl_bind_mech );
 359                 conn->c_sasl_bind_mech = NULL;
 360
 361                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 362         }
 363
 364         if( dn != NULL ) {
 365                 free( dn );
 366         }
 367         if( ndn != NULL ) {
 368                 free( ndn );
 369         }
 370         if ( mech != NULL ) {
 371                 free( mech );
 372         }
 373         if ( cred.bv_val != NULL ) {
 374                 free( cred.bv_val );
 375         }
 376
 377         return rc;
 378 }