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=%ld dn=\"%s\" method=%ld\n",
 159                         (unsigned long) version, dn, (unsigned long) 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, "do_bind: unknown version=%ld\n",
 167                         (unsigned long) version, 0, 0 );
 168                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 169                         NULL, "version not supported", NULL, NULL );
 170                 goto cleanup;
 171         }
 172
 173         if ( method == LDAP_AUTH_SASL ) {
 174                 if ( version < LDAP_VERSION3 ) {
 175                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 176                                 (unsigned long) version, 0, 0 );
 177                         send_ldap_disconnect( conn, op,
 178                                 LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
 179                         rc = -1;
 180                         goto cleanup;
 181                 }
 182
 183                 if( mech == NULL || *mech == '\0' ) {
 184                         Debug( LDAP_DEBUG_ANY,
 185                                 "do_bind: no sasl mechanism provided\n",
 186                                 0, 0, 0 );
 187                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 188                                 NULL, "no sasl mechanism provided", NULL, NULL );
 189                         goto cleanup;
 190                 }
 191
 192                 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
 193                         Debug( LDAP_DEBUG_ANY,
 194                                 "do_bind: sasl mechanism=\"%s\" not supported.\n",
 195                                 mech, 0, 0 );
 196                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 197                                 NULL, "sasl mechanism not supported", NULL, NULL );
 198                         goto cleanup;
 199                 }
 200
 201                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 202
 203                 if ( conn->c_authmech != NULL ) {
 204                         assert( conn->c_bind_in_progress );
 205
 206                         if((strcmp(conn->c_authmech, mech) != 0)) {
 207                                 /* mechanism changed, cancel in progress bind */
 208                                 conn->c_bind_in_progress = 0;
 209                                 if( conn->c_authstate != NULL ) {
 210                                         free(conn->c_authstate);
 211                                         conn->c_authstate = NULL;
 212                                 }
 213                                 free(conn->c_authmech);
 214                                 conn->c_authmech = NULL;
 215                         }
 216
 217 #ifdef LDAP_DEBUG
 218                 } else {
 219                         assert( !conn->c_bind_in_progress );
 220                         assert( conn->c_authmech == NULL );
 221                         assert( conn->c_authstate == NULL );
 222 #endif
 223                 }
 224
 225         } else {
 226                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 227
 228                 if ( conn->c_authmech != NULL ) {
 229                         assert( conn->c_bind_in_progress );
 230
 231                         /* cancel in progress bind */
 232                         conn->c_bind_in_progress = 0;
 233
 234                         if( conn->c_authstate != NULL ) {
 235                                 free(conn->c_authstate);
 236                                 conn->c_authstate = NULL;
 237                         }
 238                         free(conn->c_authmech);
 239                         conn->c_authmech = NULL;
 240                 }
 241         }
 242
 243         conn->c_protocol = version;
 244         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 245
 246         /* accept null binds */
 247         if ( ndn == NULL || *ndn == '\0' ) {
 248                 /*
 249                  * we already forced connection to "anonymous", we just
 250                  * need to send success
 251                  */
 252                 send_ldap_result( conn, op, LDAP_SUCCESS,
 253                         NULL, NULL, NULL, NULL );
 254                 goto cleanup;
 255         }
 256
 257         /*
 258          * We could be serving multiple database backends.  Select the
 259          * appropriate one, or send a referral to our "referral server"
 260          * if we don't hold it.
 261          */
 262
 263         if ( (be = select_backend( ndn )) == NULL ) {
 264                 if ( cred.bv_len == 0 ) {
 265                         send_ldap_result( conn, op, LDAP_SUCCESS,
 266                                 NULL, NULL, NULL, NULL );
 267
 268                 } else if ( default_referral ) {
 269                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 270                                 NULL, NULL, default_referral, NULL );
 271
 272                 } else {
 273                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 274                                 NULL, NULL, NULL, NULL );
 275                 }
 276
 277                 goto cleanup;
 278         }
 279
 280         if ( be->be_bind ) {
 281                 /* alias suffix */
 282                 char *edn;
 283
 284                 /* deref suffix alias if appropriate */
 285                 ndn = suffix_alias( be, ndn );
 286
 287                 if ( (*be->be_bind)( be, conn, op, ndn, method, mech, &cred, &edn ) == 0 ) {
 288                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 289
 290                         conn->c_cdn = dn;
 291                         dn = NULL;
 292
 293                         if(edn != NULL) {
 294                                 conn->c_dn = edn;
 295                         } else {
 296                                 conn->c_dn = ndn;
 297                                 ndn = NULL;
 298                         }
 299
 300                         Debug( LDAP_DEBUG_TRACE, "do_bind: bound \"%s\" to \"%s\"\n",
 301                         conn->c_cdn, conn->c_dn, method );
 302
 303                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 304
 305                         /* send this here to avoid a race condition */
 306                         send_ldap_result( conn, op, LDAP_SUCCESS,
 307                                 NULL, NULL, NULL, NULL );
 308
 309                 } else if (edn != NULL) {
 310                         free( edn );
 311                 }
 312
 313         } else {
 314                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 315                         NULL, "Function not implemented", NULL, NULL );
 316         }
 317
 318 cleanup:
 319         if( dn != NULL ) {
 320                 free( dn );
 321         }
 322         if( ndn != NULL ) {
 323                 free( ndn );
 324         }
 325         if ( mech != NULL ) {
 326                 free( mech );
 327         }
 328         if ( cred.bv_val != NULL ) {
 329                 free( cred.bv_val );
 330         }
 331
 332         return rc;
 333 }