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
   3 /*
   4  * Copyright (c) 1995 Regents of the University of Michigan.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms are permitted
   8  * provided that this notice is preserved and that due credit is given
   9  * to the University of Michigan at Ann Arbor. The name of the University
  10  * may not be used to endorse or promote products derived from this
  11  * software without specific prior written permission. This software
  12  * is provided ``as is'' without express or implied warranty.
  13  */
  14
  15 #include "portable.h"
  16
  17 #include <stdio.h>
  18
  19 #include <ac/string.h>
  20 #include <ac/socket.h>
  21
  22 #include "slap.h"
  23
  24 char *supportedSASLMechanisms[] = {
  25         "X-DIGEST-MD5",
  26         NULL
  27 };
  28
  29 int
  30 do_bind(
  31     Connection  *conn,
  32     Operation   *op
  33 )
  34 {
  35         BerElement      *ber = op->o_ber;
  36         ber_int_t               version;
  37         ber_tag_t method;
  38         char            *mech;
  39         char            *cdn, *ndn;
  40         ber_tag_t       tag;
  41         int                     rc = LDAP_SUCCESS;
  42         struct berval   cred;
  43         Backend         *be;
  44
  45         Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
  46
  47         cdn = NULL;
  48         ndn = NULL;
  49         mech = NULL;
  50         cred.bv_val = NULL;
  51
  52         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
  53
  54         /* Force to connection to "anonymous" until bind succeeds.
  55          * This may need to be relocated or done on a case by case basis
  56          * to handle certain SASL mechanisms.
  57          */
  58
  59         if ( conn->c_cdn != NULL ) {
  60                 free( conn->c_cdn );
  61                 conn->c_cdn = NULL;
  62         }
  63
  64         if ( conn->c_dn != NULL ) {
  65                 free( conn->c_dn );
  66                 conn->c_dn = NULL;
  67         }
  68
  69         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
  70
  71         if ( op->o_dn != NULL ) {
  72                 free( op->o_dn );
  73                 op->o_dn = ch_strdup( "" );
  74         }
  75
  76         if ( op->o_ndn != NULL ) {
  77                 free( op->o_ndn );
  78                 op->o_ndn = ch_strdup( "" );
  79         }
  80
  81         /*
  82          * Parse the bind request.  It looks like this:
  83          *
  84          *      BindRequest ::= SEQUENCE {
  85          *              version         INTEGER,                 -- version
  86          *              name            DistinguishedName,       -- dn
  87          *              authentication  CHOICE {
  88          *                      simple          [0] OCTET STRING -- passwd
  89          *                      krbv42ldap      [1] OCTET STRING
  90          *                      krbv42dsa       [2] OCTET STRING
  91          *                      SASL            [3] SaslCredentials
  92          *              }
  93          *      }
  94          *
  95          *      SaslCredentials ::= SEQUENCE {
  96      *          mechanism           LDAPString,
  97      *          credentials         OCTET STRING OPTIONAL
  98          *      }
  99          */
 100
 101         tag = ber_scanf( ber, "{iat" /*}*/, &version, &cdn, &method );
 102
 103         if ( tag == LBER_ERROR ) {
 104                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
 105                 send_ldap_disconnect( conn, op,
 106                         LDAP_PROTOCOL_ERROR, "decoding error" );
 107                 rc = -1;
 108                 goto cleanup;
 109         }
 110
 111         op->o_protocol = version;
 112
 113         if( method != LDAP_AUTH_SASL ) {
 114                 tag = ber_scanf( ber, /*{*/ "o}", &cred );
 115
 116         } else {
 117                 tag = ber_scanf( ber, "{a" /*}*/, &mech );
 118
 119                 if ( tag != LBER_ERROR ) {
 120                         ber_len_t len;
 121                         tag = ber_peek_tag( ber, &len );
 122
 123                         if ( tag == LDAP_TAG_LDAPCRED ) {
 124                                 tag = ber_scanf( ber, "o", &cred );
 125                         }
 126
 127                         if ( tag != LBER_ERROR ) {
 128                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 129                         }
 130                 }
 131         }
 132
 133         if ( tag == LBER_ERROR ) {
 134                 send_ldap_disconnect( conn, op,
 135                         LDAP_PROTOCOL_ERROR,
 136                 "decoding error" );
 137                 rc = -1;
 138                 goto cleanup;
 139         }
 140
 141         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 142                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 143                 goto cleanup;
 144         }
 145
 146         if( method == LDAP_AUTH_SASL ) {
 147                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 148                         cdn, mech, NULL );
 149         } else {
 150                 Debug( LDAP_DEBUG_TRACE, "do_bind: version %d dn (%s) method %d\n",
 151                         version, cdn, method );
 152         }
 153
 154         ndn = dn_normalize_case( ch_strdup( cdn ) );
 155
 156         Statslog( LDAP_DEBUG_STATS, "conn=%d op=%d BIND dn=\"%s\" method=%d\n",
 157             op->o_connid, op->o_opid, ndn, method, 0 );
 158
 159         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 160                 Debug( LDAP_DEBUG_ANY, "unknown version %d\n", version, 0, 0 );
 161                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 162                         NULL, "version not supported", NULL, NULL );
 163                 goto cleanup;
 164         }
 165
 166         if ( method == LDAP_AUTH_SASL ) {
 167                 if ( version < LDAP_VERSION3 ) {
 168                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%d\n",
 169                                 version, 0, 0 );
 170                         send_ldap_disconnect( conn, op,
 171                                 LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
 172                         rc = -1;
 173                         goto cleanup;
 174                 }
 175
 176                 if( mech == NULL || *mech == '\0' ) {
 177                         Debug( LDAP_DEBUG_ANY,
 178                                 "do_bind: no sasl mechanism provided\n",
 179                                 version, 0, 0 );
 180                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 181                                 NULL, "no sasl mechanism provided", NULL, NULL );
 182                         goto cleanup;
 183                 }
 184
 185                 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
 186                         Debug( LDAP_DEBUG_ANY,
 187                                 "do_bind: sasl mechanism \"%s\" not supported.\n",
 188                                 mech, 0, 0 );
 189                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 190                                 NULL, "sasl mechanism not supported", NULL, NULL );
 191                         goto cleanup;
 192                 }
 193
 194                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 195
 196                 if ( conn->c_authmech != NULL ) {
 197                         assert( conn->c_bind_in_progress );
 198
 199                         if((strcmp(conn->c_authmech, mech) != 0)) {
 200                                 /* mechanism changed, cancel in progress bind */
 201                                 conn->c_bind_in_progress = 0;
 202                                 if( conn->c_authstate != NULL ) {
 203                                         free(conn->c_authstate);
 204                                         conn->c_authstate = NULL;
 205                                 }
 206                                 free(conn->c_authmech);
 207                                 conn->c_authmech = NULL;
 208                         }
 209
 210 #ifdef LDAP_DEBUG
 211                 } else {
 212                         assert( !conn->c_bind_in_progress );
 213                         assert( conn->c_authmech == NULL );
 214                         assert( conn->c_authstate == NULL );
 215 #endif
 216                 }
 217
 218         } else {
 219                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 220
 221                 if ( conn->c_authmech != NULL ) {
 222                         assert( conn->c_bind_in_progress );
 223
 224                         /* cancel in progress bind */
 225                         conn->c_bind_in_progress = 0;
 226
 227                         if( conn->c_authstate != NULL ) {
 228                                 free(conn->c_authstate);
 229                                 conn->c_authstate = NULL;
 230                         }
 231                         free(conn->c_authmech);
 232                         conn->c_authmech = NULL;
 233                 }
 234         }
 235
 236         conn->c_protocol = version;
 237         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 238
 239         /* accept null binds */
 240         if ( ndn == NULL || *ndn == '\0' ) {
 241                 /*
 242                  * we already forced connection to "anonymous", we just
 243                  * need to send success
 244                  */
 245                 send_ldap_result( conn, op, LDAP_SUCCESS,
 246                         NULL, NULL, NULL, NULL );
 247                 goto cleanup;
 248         }
 249
 250         /*
 251          * We could be serving multiple database backends.  Select the
 252          * appropriate one, or send a referral to our "referral server"
 253          * if we don't hold it.
 254          */
 255
 256         if ( (be = select_backend( ndn )) == NULL ) {
 257                 if ( cred.bv_len == 0 ) {
 258                         send_ldap_result( conn, op, LDAP_SUCCESS,
 259                                 NULL, NULL, NULL, NULL );
 260
 261                 } else if ( default_referral ) {
 262                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 263                                 NULL, NULL, default_referral, NULL );
 264
 265                 } else {
 266                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 267                                 NULL, NULL, NULL, NULL );
 268                 }
 269
 270                 goto cleanup;
 271         }
 272
 273         if ( be->be_bind ) {
 274                 /* alias suffix */
 275                 char *edn;
 276
 277                 if ( (*be->be_bind)( be, conn, op, ndn, method, mech, &cred, &edn ) == 0 ) {
 278                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 279
 280                         conn->c_cdn = cdn;
 281                         cdn = NULL;
 282
 283                         if(edn != NULL) {
 284                                 conn->c_dn = edn;
 285                         } else {
 286                                 conn->c_dn = ndn;
 287                                 ndn = NULL;
 288                         }
 289
 290                         Debug( LDAP_DEBUG_TRACE, "do_bind: bound \"%s\" to \"%s\"\n",
 291                         conn->c_cdn, conn->c_dn, method );
 292
 293                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 294
 295                         /* send this here to avoid a race condition */
 296                         send_ldap_result( conn, op, LDAP_SUCCESS,
 297                                 NULL, NULL, NULL, NULL );
 298
 299                 } else if (edn != NULL) {
 300                         free( edn );
 301                 }
 302
 303         } else {
 304                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 305                         NULL, "Function not implemented", NULL, NULL );
 306         }
 307
 308 cleanup:
 309         if( cdn != NULL ) {
 310                 free( cdn );
 311         }
 312         if( ndn != NULL ) {
 313                 free( ndn );
 314         }
 315         if ( mech != NULL ) {
 316                 free( mech );
 317         }
 318         if ( cred.bv_val != NULL ) {
 319                 free( cred.bv_val );
 320         }
 321
 322         return rc;
 323 }