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            *dn, *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 %d dn (%s) method %d\n",
 160                         version, dn, method );
 161         }
 162
 163         Statslog( LDAP_DEBUG_STATS, "conn=%d op=%d BIND dn=\"%s\" method=%d\n",
 164             op->o_connid, op->o_opid, ndn, method, 0 );
 165
 166         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 167                 Debug( LDAP_DEBUG_ANY, "unknown version %d\n", 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%d\n",
 176                                 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                                 version, 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                 if ( (*be->be_bind)( be, conn, op, ndn, method, mech, &cred, &edn ) == 0 ) {
 285                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 286
 287                         conn->c_cdn = dn;
 288                         dn = NULL;
 289
 290                         if(edn != NULL) {
 291                                 conn->c_dn = edn;
 292                         } else {
 293                                 conn->c_dn = ndn;
 294                                 ndn = NULL;
 295                         }
 296
 297                         Debug( LDAP_DEBUG_TRACE, "do_bind: bound \"%s\" to \"%s\"\n",
 298                         conn->c_cdn, conn->c_dn, method );
 299
 300                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 301
 302                         /* send this here to avoid a race condition */
 303                         send_ldap_result( conn, op, LDAP_SUCCESS,
 304                                 NULL, NULL, NULL, NULL );
 305
 306                 } else if (edn != NULL) {
 307                         free( edn );
 308                 }
 309
 310         } else {
 311                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 312                         NULL, "Function not implemented", NULL, NULL );
 313         }
 314
 315 cleanup:
 316         if( dn != NULL ) {
 317                 free( dn );
 318         }
 319         if( ndn != NULL ) {
 320                 free( ndn );
 321         }
 322         if ( mech != NULL ) {
 323                 free( mech );
 324         }
 325         if ( cred.bv_val != NULL ) {
 326                 free( cred.bv_val );
 327         }
 328
 329         return rc;
 330 }