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  * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6
   7 /*
   8  * Copyright (c) 1995 Regents of the University of Michigan.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms are permitted
  12  * provided that this notice is preserved and that due credit is given
  13  * to the University of Michigan at Ann Arbor. The name of the University
  14  * may not be used to endorse or promote products derived from this
  15  * software without specific prior written permission. This software
  16  * is provided ``as is'' without express or implied warranty.
  17  */
  18
  19 #include "portable.h"
  20
  21 #include <stdio.h>
  22
  23 #include <ac/string.h>
  24 #include <ac/socket.h>
  25
  26 #include "slap.h"
  27
  28 int
  29 do_bind(
  30     Connection  *conn,
  31     Operation   *op
  32 )
  33 {
  34         BerElement      *ber = op->o_ber;
  35         ber_int_t               version;
  36         ber_tag_t method;
  37         char            *mech;
  38         char            *dn;
  39         char *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         dn = 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, &dn, &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         ndn = ch_strdup( dn );
 112
 113         if ( dn_normalize_case( ndn ) == NULL ) {
 114                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
 115                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 116                     "invalid DN", NULL, NULL );
 117                 goto cleanup;
 118         }
 119
 120         op->o_protocol = version;
 121
 122         if( method != LDAP_AUTH_SASL ) {
 123                 tag = ber_scanf( ber, /*{*/ "o}", &cred );
 124
 125         } else {
 126                 tag = ber_scanf( ber, "{a" /*}*/, &mech );
 127
 128                 if ( tag != LBER_ERROR ) {
 129                         ber_len_t len;
 130                         tag = ber_peek_tag( ber, &len );
 131
 132                         if ( tag == LDAP_TAG_LDAPCRED ) {
 133                                 tag = ber_scanf( ber, "o", &cred );
 134                         }
 135
 136                         if ( tag != LBER_ERROR ) {
 137                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 138                         }
 139                 }
 140         }
 141
 142         if ( tag == LBER_ERROR ) {
 143                 send_ldap_disconnect( conn, op,
 144                         LDAP_PROTOCOL_ERROR,
 145                 "decoding error" );
 146                 rc = -1;
 147                 goto cleanup;
 148         }
 149
 150         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 151                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 152                 goto cleanup;
 153         }
 154
 155         if( method == LDAP_AUTH_SASL ) {
 156                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 157                         dn, mech, NULL );
 158         } else {
 159                 Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 160                         (unsigned long) version, dn, (unsigned long) method );
 161         }
 162
 163         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 164             op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
 165
 166         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 167                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 168                         (unsigned long) version, 0, 0 );
 169                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 170                         NULL, "version not supported", NULL, NULL );
 171                 goto cleanup;
 172         }
 173
 174         if ( method == LDAP_AUTH_SASL ) {
 175                 if ( version < LDAP_VERSION3 ) {
 176                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 177                                 (unsigned long) version, 0, 0 );
 178                         send_ldap_disconnect( conn, op,
 179                                 LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
 180                         rc = -1;
 181                         goto cleanup;
 182                 }
 183
 184                 if( mech == NULL || *mech == '\0' ) {
 185                         Debug( LDAP_DEBUG_ANY,
 186                                 "do_bind: no sasl mechanism provided\n",
 187                                 0, 0, 0 );
 188                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 189                                 NULL, "no sasl mechanism provided", NULL, NULL );
 190                         goto cleanup;
 191                 }
 192
 193                 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
 194                         Debug( LDAP_DEBUG_ANY,
 195                                 "do_bind: sasl mechanism=\"%s\" not supported.\n",
 196                                 mech, 0, 0 );
 197                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 198                                 NULL, "sasl mechanism not supported", NULL, NULL );
 199                         goto cleanup;
 200                 }
 201
 202                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 203
 204                 if ( conn->c_authmech != NULL ) {
 205                         assert( conn->c_bind_in_progress );
 206
 207                         if((strcmp(conn->c_authmech, mech) != 0)) {
 208                                 /* mechanism changed, cancel in progress bind */
 209                                 conn->c_bind_in_progress = 0;
 210                                 if( conn->c_authstate != NULL ) {
 211                                         free(conn->c_authstate);
 212                                         conn->c_authstate = NULL;
 213                                 }
 214                                 free(conn->c_authmech);
 215                                 conn->c_authmech = NULL;
 216                         }
 217
 218 #ifdef LDAP_DEBUG
 219                 } else {
 220                         assert( !conn->c_bind_in_progress );
 221                         assert( conn->c_authmech == NULL );
 222                         assert( conn->c_authstate == NULL );
 223 #endif
 224                 }
 225
 226         } else {
 227                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 228
 229                 if ( conn->c_authmech != NULL ) {
 230                         assert( conn->c_bind_in_progress );
 231
 232                         /* cancel in progress bind */
 233                         conn->c_bind_in_progress = 0;
 234
 235                         if( conn->c_authstate != NULL ) {
 236                                 free(conn->c_authstate);
 237                                 conn->c_authstate = NULL;
 238                         }
 239                         free(conn->c_authmech);
 240                         conn->c_authmech = NULL;
 241                 }
 242         }
 243
 244         conn->c_protocol = version;
 245         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 246
 247         /* accept null binds */
 248         if ( ndn == NULL || *ndn == '\0' ) {
 249                 /*
 250                  * we already forced connection to "anonymous", we just
 251                  * need to send success
 252                  */
 253                 send_ldap_result( conn, op, LDAP_SUCCESS,
 254                         NULL, NULL, NULL, NULL );
 255                 goto cleanup;
 256         }
 257
 258         /*
 259          * We could be serving multiple database backends.  Select the
 260          * appropriate one, or send a referral to our "referral server"
 261          * if we don't hold it.
 262          */
 263
 264         if ( (be = select_backend( ndn )) == NULL ) {
 265                 if ( cred.bv_len == 0 ) {
 266                         send_ldap_result( conn, op, LDAP_SUCCESS,
 267                                 NULL, NULL, NULL, NULL );
 268
 269                 } else if ( default_referral ) {
 270                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 271                                 NULL, NULL, default_referral, NULL );
 272
 273                 } else {
 274                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 275                                 NULL, NULL, NULL, NULL );
 276                 }
 277
 278                 goto cleanup;
 279         }
 280
 281         if ( be->be_bind ) {
 282                 /* alias suffix */
 283                 char *edn;
 284
 285                 /* deref suffix alias if appropriate */
 286                 ndn = suffix_alias( be, ndn );
 287
 288                 if ( (*be->be_bind)( be, conn, op, ndn, method, mech, &cred, &edn ) == 0 ) {
 289                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 290
 291                         conn->c_cdn = dn;
 292                         dn = NULL;
 293
 294                         if(edn != NULL) {
 295                                 conn->c_dn = edn;
 296                         } else {
 297                                 conn->c_dn = ndn;
 298                                 ndn = NULL;
 299                         }
 300
 301                         Debug( LDAP_DEBUG_TRACE, "do_bind: bound \"%s\" to \"%s\"\n",
 302                         conn->c_cdn, conn->c_dn, method );
 303
 304                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 305
 306                         /* send this here to avoid a race condition */
 307                         send_ldap_result( conn, op, LDAP_SUCCESS,
 308                                 NULL, NULL, NULL, NULL );
 309
 310                 } else if (edn != NULL) {
 311                         free( edn );
 312                 }
 313
 314         } else {
 315                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 316                         NULL, "Function not implemented", NULL, NULL );
 317         }
 318
 319 cleanup:
 320         if( dn != NULL ) {
 321                 free( dn );
 322         }
 323         if( ndn != NULL ) {
 324                 free( ndn );
 325         }
 326         if ( mech != NULL ) {
 327                 free( mech );
 328         }
 329         if ( cred.bv_val != NULL ) {
 330                 free( cred.bv_val );
 331         }
 332
 333         return rc;
 334 }