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, *ndn;
  39         ber_tag_t       tag;
  40         int                     rc = LDAP_SUCCESS;
  41         struct berval   cred;
  42         Backend         *be;
  43
  44         Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
  45
  46         dn = NULL;
  47         ndn = NULL;
  48         mech = NULL;
  49         cred.bv_val = NULL;
  50
  51         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
  52
  53         /* Force to connection to "anonymous" until bind succeeds.
  54          * This may need to be relocated or done on a case by case basis
  55          * to handle certain SASL mechanisms.
  56          */
  57
  58         if ( conn->c_cdn != NULL ) {
  59                 free( conn->c_cdn );
  60                 conn->c_cdn = NULL;
  61         }
  62
  63         if ( conn->c_dn != NULL ) {
  64                 free( conn->c_dn );
  65                 conn->c_dn = NULL;
  66         }
  67
  68         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
  69
  70         if ( op->o_dn != NULL ) {
  71                 free( op->o_dn );
  72                 op->o_dn = ch_strdup( "" );
  73         }
  74
  75         if ( op->o_ndn != NULL ) {
  76                 free( op->o_ndn );
  77                 op->o_ndn = ch_strdup( "" );
  78         }
  79
  80         /*
  81          * Parse the bind request.  It looks like this:
  82          *
  83          *      BindRequest ::= SEQUENCE {
  84          *              version         INTEGER,                 -- version
  85          *              name            DistinguishedName,       -- dn
  86          *              authentication  CHOICE {
  87          *                      simple          [0] OCTET STRING -- passwd
  88          *                      krbv42ldap      [1] OCTET STRING
  89          *                      krbv42dsa       [2] OCTET STRING
  90          *                      SASL            [3] SaslCredentials
  91          *              }
  92          *      }
  93          *
  94          *      SaslCredentials ::= SEQUENCE {
  95      *          mechanism           LDAPString,
  96      *          credentials         OCTET STRING OPTIONAL
  97          *      }
  98          */
  99
 100         tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
 101
 102         if ( tag == LBER_ERROR ) {
 103                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
 104                 send_ldap_disconnect( conn, op,
 105                         LDAP_PROTOCOL_ERROR, "decoding error" );
 106                 rc = -1;
 107                 goto cleanup;
 108         }
 109
 110         ndn = ch_strdup( dn );
 111
 112         if ( dn_normalize_case( ndn ) == NULL ) {
 113                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
 114                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 115                     "invalid DN", NULL, NULL );
 116                 goto cleanup;
 117         }
 118
 119         op->o_protocol = version;
 120
 121         if( method != LDAP_AUTH_SASL ) {
 122                 tag = ber_scanf( ber, /*{*/ "o}", &cred );
 123
 124         } else {
 125                 tag = ber_scanf( ber, "{a" /*}*/, &mech );
 126
 127                 if ( tag != LBER_ERROR ) {
 128                         ber_len_t len;
 129                         tag = ber_peek_tag( ber, &len );
 130
 131                         if ( tag == LDAP_TAG_LDAPCRED ) {
 132                                 tag = ber_scanf( ber, "o", &cred );
 133                         }
 134
 135                         if ( tag != LBER_ERROR ) {
 136                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 137                         }
 138                 }
 139         }
 140
 141         if ( tag == LBER_ERROR ) {
 142                 send_ldap_disconnect( conn, op,
 143                         LDAP_PROTOCOL_ERROR,
 144                 "decoding error" );
 145                 rc = -1;
 146                 goto cleanup;
 147         }
 148
 149         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 150                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 151                 goto cleanup;
 152         }
 153
 154         if( method == LDAP_AUTH_SASL ) {
 155                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 156                         dn, mech, NULL );
 157         } else {
 158                 Debug( LDAP_DEBUG_TRACE, "do_bind: version %d dn (%s) method %d\n",
 159                         version, dn, method );
 160         }
 161
 162         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 163             op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
 164
 165         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 166                 Debug( LDAP_DEBUG_ANY, "unknown version %d\n", version, 0, 0 );
 167                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 168                         NULL, "version not supported", NULL, NULL );
 169                 goto cleanup;
 170         }
 171
 172         if ( method == LDAP_AUTH_SASL ) {
 173                 if ( version < LDAP_VERSION3 ) {
 174                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%d\n",
 175                                 version, 0, 0 );
 176                         send_ldap_disconnect( conn, op,
 177                                 LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
 178                         rc = -1;
 179                         goto cleanup;
 180                 }
 181
 182                 if( mech == NULL || *mech == '\0' ) {
 183                         Debug( LDAP_DEBUG_ANY,
 184                                 "do_bind: no sasl mechanism provided\n",
 185                                 version, 0, 0 );
 186                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 187                                 NULL, "no sasl mechanism provided", NULL, NULL );
 188                         goto cleanup;
 189                 }
 190
 191                 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
 192                         Debug( LDAP_DEBUG_ANY,
 193                                 "do_bind: sasl mechanism \"%s\" not supported.\n",
 194                                 mech, 0, 0 );
 195                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 196                                 NULL, "sasl mechanism not supported", NULL, NULL );
 197                         goto cleanup;
 198                 }
 199
 200                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 201
 202                 if ( conn->c_authmech != NULL ) {
 203                         assert( conn->c_bind_in_progress );
 204
 205                         if((strcmp(conn->c_authmech, mech) != 0)) {
 206                                 /* mechanism changed, cancel in progress bind */
 207                                 conn->c_bind_in_progress = 0;
 208                                 if( conn->c_authstate != NULL ) {
 209                                         free(conn->c_authstate);
 210                                         conn->c_authstate = NULL;
 211                                 }
 212                                 free(conn->c_authmech);
 213                                 conn->c_authmech = NULL;
 214                         }
 215
 216 #ifdef LDAP_DEBUG
 217                 } else {
 218                         assert( !conn->c_bind_in_progress );
 219                         assert( conn->c_authmech == NULL );
 220                         assert( conn->c_authstate == NULL );
 221 #endif
 222                 }
 223
 224         } else {
 225                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 226
 227                 if ( conn->c_authmech != NULL ) {
 228                         assert( conn->c_bind_in_progress );
 229
 230                         /* cancel in progress bind */
 231                         conn->c_bind_in_progress = 0;
 232
 233                         if( conn->c_authstate != NULL ) {
 234                                 free(conn->c_authstate);
 235                                 conn->c_authstate = NULL;
 236                         }
 237                         free(conn->c_authmech);
 238                         conn->c_authmech = NULL;
 239                 }
 240         }
 241
 242         conn->c_protocol = version;
 243         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 244
 245         /* accept null binds */
 246         if ( ndn == NULL || *ndn == '\0' ) {
 247                 /*
 248                  * we already forced connection to "anonymous", we just
 249                  * need to send success
 250                  */
 251                 send_ldap_result( conn, op, LDAP_SUCCESS,
 252                         NULL, NULL, NULL, NULL );
 253                 goto cleanup;
 254         }
 255
 256         /*
 257          * We could be serving multiple database backends.  Select the
 258          * appropriate one, or send a referral to our "referral server"
 259          * if we don't hold it.
 260          */
 261
 262         if ( (be = select_backend( ndn )) == NULL ) {
 263                 if ( cred.bv_len == 0 ) {
 264                         send_ldap_result( conn, op, LDAP_SUCCESS,
 265                                 NULL, NULL, NULL, NULL );
 266
 267                 } else if ( default_referral ) {
 268                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 269                                 NULL, NULL, default_referral, NULL );
 270
 271                 } else {
 272                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 273                                 NULL, NULL, NULL, NULL );
 274                 }
 275
 276                 goto cleanup;
 277         }
 278
 279         if ( be->be_bind ) {
 280                 /* alias suffix */
 281                 char *edn;
 282
 283                 /* deref suffix alias if appropriate */
 284                 ndn = suffix_alias( be, ndn );
 285
 286                 if ( (*be->be_bind)( be, conn, op, ndn, method, mech, &cred, &edn ) == 0 ) {
 287                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 288
 289                         conn->c_cdn = dn;
 290                         dn = NULL;
 291
 292                         if(edn != NULL) {
 293                                 conn->c_dn = edn;
 294                         } else {
 295                                 conn->c_dn = ndn;
 296                                 ndn = NULL;
 297                         }
 298
 299                         Debug( LDAP_DEBUG_TRACE, "do_bind: bound \"%s\" to \"%s\"\n",
 300                         conn->c_cdn, conn->c_dn, method );
 301
 302                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 303
 304                         /* send this here to avoid a race condition */
 305                         send_ldap_result( conn, op, LDAP_SUCCESS,
 306                                 NULL, NULL, NULL, NULL );
 307
 308                 } else if (edn != NULL) {
 309                         free( edn );
 310                 }
 311
 312         } else {
 313                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 314                         NULL, "Function not implemented", NULL, NULL );
 315         }
 316
 317 cleanup:
 318         if( dn != NULL ) {
 319                 free( dn );
 320         }
 321         if( ndn != NULL ) {
 322                 free( ndn );
 323         }
 324         if ( mech != NULL ) {
 325                 free( mech );
 326         }
 327         if ( cred.bv_val != NULL ) {
 328                 free( cred.bv_val );
 329         }
 330
 331         return rc;
 332 }