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 = NULL;
  25
  26 int
  27 do_bind(
  28     Connection  *conn,
  29     Operation   *op
  30 )
  31 {
  32         BerElement      *ber = op->o_ber;
  33         ber_int_t               version;
  34         ber_tag_t method;
  35         char            *mech;
  36         char            *dn, *ndn;
  37         ber_tag_t       tag;
  38         int                     rc = LDAP_SUCCESS;
  39         struct berval   cred;
  40         Backend         *be;
  41
  42         Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
  43
  44         dn = NULL;
  45         ndn = NULL;
  46         mech = NULL;
  47         cred.bv_val = NULL;
  48
  49         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
  50
  51         /* Force to connection to "anonymous" until bind succeeds.
  52          * This may need to be relocated or done on a case by case basis
  53          * to handle certain SASL mechanisms.
  54          */
  55
  56         if ( conn->c_cdn != NULL ) {
  57                 free( conn->c_cdn );
  58                 conn->c_cdn = NULL;
  59         }
  60
  61         if ( conn->c_dn != NULL ) {
  62                 free( conn->c_dn );
  63                 conn->c_dn = NULL;
  64         }
  65
  66         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
  67
  68         if ( op->o_dn != NULL ) {
  69                 free( op->o_dn );
  70                 op->o_dn = ch_strdup( "" );
  71         }
  72
  73         if ( op->o_ndn != NULL ) {
  74                 free( op->o_ndn );
  75                 op->o_ndn = ch_strdup( "" );
  76         }
  77
  78         /*
  79          * Parse the bind request.  It looks like this:
  80          *
  81          *      BindRequest ::= SEQUENCE {
  82          *              version         INTEGER,                 -- version
  83          *              name            DistinguishedName,       -- dn
  84          *              authentication  CHOICE {
  85          *                      simple          [0] OCTET STRING -- passwd
  86          *                      krbv42ldap      [1] OCTET STRING
  87          *                      krbv42dsa       [2] OCTET STRING
  88          *                      SASL            [3] SaslCredentials
  89          *              }
  90          *      }
  91          *
  92          *      SaslCredentials ::= SEQUENCE {
  93      *          mechanism           LDAPString,
  94      *          credentials         OCTET STRING OPTIONAL
  95          *      }
  96          */
  97
  98         tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
  99
 100         if ( tag == LBER_ERROR ) {
 101                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
 102                 send_ldap_disconnect( conn, op,
 103                         LDAP_PROTOCOL_ERROR, "decoding error" );
 104                 rc = -1;
 105                 goto cleanup;
 106         }
 107
 108         ndn = ch_strdup( dn );
 109
 110         if ( dn_normalize_case( ndn ) == NULL ) {
 111                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
 112                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 113                     "invalid DN", NULL, NULL );
 114                 goto cleanup;
 115         }
 116
 117         op->o_protocol = version;
 118
 119         if( method != LDAP_AUTH_SASL ) {
 120                 tag = ber_scanf( ber, /*{*/ "o}", &cred );
 121
 122         } else {
 123                 tag = ber_scanf( ber, "{a" /*}*/, &mech );
 124
 125                 if ( tag != LBER_ERROR ) {
 126                         ber_len_t len;
 127                         tag = ber_peek_tag( ber, &len );
 128
 129                         if ( tag == LDAP_TAG_LDAPCRED ) {
 130                                 tag = ber_scanf( ber, "o", &cred );
 131                         }
 132
 133                         if ( tag != LBER_ERROR ) {
 134                                 tag = ber_scanf( ber, /*{{*/ "}}" );
 135                         }
 136                 }
 137         }
 138
 139         if ( tag == LBER_ERROR ) {
 140                 send_ldap_disconnect( conn, op,
 141                         LDAP_PROTOCOL_ERROR,
 142                 "decoding error" );
 143                 rc = -1;
 144                 goto cleanup;
 145         }
 146
 147         if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
 148                 Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
 149                 goto cleanup;
 150         }
 151
 152         if( method == LDAP_AUTH_SASL ) {
 153                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 154                         dn, mech, NULL );
 155         } else {
 156                 Debug( LDAP_DEBUG_TRACE, "do_bind: version %d dn (%s) method %d\n",
 157                         version, dn, method );
 158         }
 159
 160         Statslog( LDAP_DEBUG_STATS, "conn=%d op=%d BIND dn=\"%s\" method=%d\n",
 161             op->o_connid, op->o_opid, ndn, method, 0 );
 162
 163         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 164                 Debug( LDAP_DEBUG_ANY, "unknown version %d\n", version, 0, 0 );
 165                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 166                         NULL, "version not supported", NULL, NULL );
 167                 goto cleanup;
 168         }
 169
 170         if ( method == LDAP_AUTH_SASL ) {
 171                 if ( version < LDAP_VERSION3 ) {
 172                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%d\n",
 173                                 version, 0, 0 );
 174                         send_ldap_disconnect( conn, op,
 175                                 LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
 176                         rc = -1;
 177                         goto cleanup;
 178                 }
 179
 180                 if( mech == NULL || *mech == '\0' ) {
 181                         Debug( LDAP_DEBUG_ANY,
 182                                 "do_bind: no sasl mechanism provided\n",
 183                                 version, 0, 0 );
 184                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 185                                 NULL, "no sasl mechanism provided", NULL, NULL );
 186                         goto cleanup;
 187                 }
 188
 189                 if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
 190                         Debug( LDAP_DEBUG_ANY,
 191                                 "do_bind: sasl mechanism \"%s\" not supported.\n",
 192                                 mech, 0, 0 );
 193                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 194                                 NULL, "sasl mechanism not supported", NULL, NULL );
 195                         goto cleanup;
 196                 }
 197
 198                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 199
 200                 if ( conn->c_authmech != NULL ) {
 201                         assert( conn->c_bind_in_progress );
 202
 203                         if((strcmp(conn->c_authmech, mech) != 0)) {
 204                                 /* mechanism changed, cancel in progress bind */
 205                                 conn->c_bind_in_progress = 0;
 206                                 if( conn->c_authstate != NULL ) {
 207                                         free(conn->c_authstate);
 208                                         conn->c_authstate = NULL;
 209                                 }
 210                                 free(conn->c_authmech);
 211                                 conn->c_authmech = NULL;
 212                         }
 213
 214 #ifdef LDAP_DEBUG
 215                 } else {
 216                         assert( !conn->c_bind_in_progress );
 217                         assert( conn->c_authmech == NULL );
 218                         assert( conn->c_authstate == NULL );
 219 #endif
 220                 }
 221
 222         } else {
 223                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 224
 225                 if ( conn->c_authmech != NULL ) {
 226                         assert( conn->c_bind_in_progress );
 227
 228                         /* cancel in progress bind */
 229                         conn->c_bind_in_progress = 0;
 230
 231                         if( conn->c_authstate != NULL ) {
 232                                 free(conn->c_authstate);
 233                                 conn->c_authstate = NULL;
 234                         }
 235                         free(conn->c_authmech);
 236                         conn->c_authmech = NULL;
 237                 }
 238         }
 239
 240         conn->c_protocol = version;
 241         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 242
 243         /* accept null binds */
 244         if ( ndn == NULL || *ndn == '\0' ) {
 245                 /*
 246                  * we already forced connection to "anonymous", we just
 247                  * need to send success
 248                  */
 249                 send_ldap_result( conn, op, LDAP_SUCCESS,
 250                         NULL, NULL, NULL, NULL );
 251                 goto cleanup;
 252         }
 253
 254         /*
 255          * We could be serving multiple database backends.  Select the
 256          * appropriate one, or send a referral to our "referral server"
 257          * if we don't hold it.
 258          */
 259
 260         if ( (be = select_backend( ndn )) == NULL ) {
 261                 if ( cred.bv_len == 0 ) {
 262                         send_ldap_result( conn, op, LDAP_SUCCESS,
 263                                 NULL, NULL, NULL, NULL );
 264
 265                 } else if ( default_referral ) {
 266                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 267                                 NULL, NULL, default_referral, NULL );
 268
 269                 } else {
 270                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 271                                 NULL, NULL, NULL, NULL );
 272                 }
 273
 274                 goto cleanup;
 275         }
 276
 277         if ( be->be_bind ) {
 278                 /* alias suffix */
 279                 char *edn;
 280
 281                 /* deref suffix alias if appropriate */
 282                 ndn = suffix_alias( be, ndn );
 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 }