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 /* $OpenLDAP$ */
   3 /*
   4  * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
   5  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   6  */
   7
   8 /*
   9  * Copyright (c) 1995 Regents of the University of Michigan.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms are permitted
  13  * provided that this notice is preserved and that due credit is given
  14  * to the University of Michigan at Ann Arbor. The name of the University
  15  * may not be used to endorse or promote products derived from this
  16  * software without specific prior written permission. This software
  17  * is provided ``as is'' without express or implied warranty.
  18  */
  19
  20 #include "portable.h"
  21
  22 #include <stdio.h>
  23
  24 #include <ac/string.h>
  25 #include <ac/socket.h>
  26
  27 #include "ldap_pvt.h"
  28 #include "slap.h"
  29
  30 int
  31 do_bind(
  32     Connection  *conn,
  33     Operation   *op
  34 )
  35 {
  36         BerElement      *ber = op->o_ber;
  37         ber_int_t               version;
  38         ber_tag_t method;
  39         char            *mech;
  40         char            *saslmech;
  41         char            *dn;
  42         char *ndn;
  43         ber_tag_t       tag;
  44         int                     rc = LDAP_SUCCESS;
  45         const char      *text;
  46         struct berval   cred;
  47         Backend         *be;
  48
  49         Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
  50
  51         dn = NULL;
  52         ndn = NULL;
  53         mech = NULL;
  54         cred.bv_val = NULL;
  55
  56         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
  57
  58         /*
  59          * Force to connection to "anonymous" until bind succeeds.
  60          */
  61
  62         if ( conn->c_cdn != NULL ) {
  63                 free( conn->c_cdn );
  64                 conn->c_cdn = NULL;
  65         }
  66
  67         if ( conn->c_dn != NULL ) {
  68                 free( conn->c_dn );
  69                 conn->c_dn = NULL;
  70         }
  71
  72         conn->c_authc_backend = NULL;
  73         conn->c_authz_backend = NULL;
  74
  75         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
  76
  77         if ( op->o_dn != NULL ) {
  78                 free( op->o_dn );
  79                 op->o_dn = ch_strdup( "" );
  80         }
  81
  82         if ( op->o_ndn != NULL ) {
  83                 free( op->o_ndn );
  84                 op->o_ndn = ch_strdup( "" );
  85         }
  86
  87         /*
  88          * Parse the bind request.  It looks like this:
  89          *
  90          *      BindRequest ::= SEQUENCE {
  91          *              version         INTEGER,                 -- version
  92          *              name            DistinguishedName,       -- dn
  93          *              authentication  CHOICE {
  94          *                      simple          [0] OCTET STRING -- passwd
  95          *                      krbv42ldap      [1] OCTET STRING
  96          *                      krbv42dsa       [2] OCTET STRING
  97          *                      SASL            [3] SaslCredentials
  98          *              }
  99          *      }
 100          *
 101          *      SaslCredentials ::= SEQUENCE {
 102      *          mechanism           LDAPString,
 103      *          credentials         OCTET STRING OPTIONAL
 104          *      }
 105          */
 106
 107         tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
 108
 109         if ( tag == LBER_ERROR ) {
 110                 Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
 111                 send_ldap_disconnect( conn, op,
 112                         LDAP_PROTOCOL_ERROR, "decoding error" );
 113                 rc = -1;
 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 = SLAPD_DISCONNECT;
 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         ndn = ch_strdup( dn );
 153
 154         if ( dn_normalize( ndn ) == NULL ) {
 155                 Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
 156                 send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 157                     "invalid DN", NULL, NULL );
 158                 goto cleanup;
 159         }
 160
 161         if( method == LDAP_AUTH_SASL ) {
 162                 Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
 163                         dn, mech, NULL );
 164         } else {
 165                 Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n",
 166                         (unsigned long) version, dn, (unsigned long) method );
 167         }
 168
 169         Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
 170             op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
 171
 172         if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
 173                 Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
 174                         (unsigned long) version, 0, 0 );
 175                 send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
 176                         NULL, "requested protocol version not supported", NULL, NULL );
 177                 goto cleanup;
 178         }
 179
 180         /* we set connection version regardless of whether bind succeeds
 181          * or not.
 182          */
 183         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 184         conn->c_protocol = version;
 185         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 186
 187         if ( method == LDAP_AUTH_SASL ) {
 188                 char *edn;
 189                 slap_ssf_t ssf = 0;
 190
 191                 if ( version < LDAP_VERSION3 ) {
 192                         Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
 193                                 (unsigned long) version, 0, 0 );
 194                         send_ldap_disconnect( conn, op,
 195                                 LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
 196                         rc = SLAPD_DISCONNECT;
 197                         goto cleanup;
 198                 }
 199
 200                 if( mech == NULL || *mech == '\0' ) {
 201                         Debug( LDAP_DEBUG_ANY,
 202                                 "do_bind: no sasl mechanism provided\n",
 203                                 0, 0, 0 );
 204                         send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
 205                                 NULL, "no SASL mechanism provided", NULL, NULL );
 206                         goto cleanup;
 207                 }
 208
 209                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 210
 211                 if ( conn->c_sasl_bind_mech != NULL ) {
 212                         /* SASL bind is in progress */
 213                         saslmech = NULL;
 214
 215                         if((strcmp(conn->c_sasl_bind_mech, mech) != 0)) {
 216                                 /* mechanism changed */
 217                                 slap_sasl_reset(conn);
 218                         }
 219
 220                         free( conn->c_sasl_bind_mech );
 221                         conn->c_sasl_bind_mech = NULL;
 222
 223 #ifdef LDAP_DEBUG
 224                 } else {
 225                         /* SASL bind is NOT in progress */
 226                         saslmech = mech;
 227                         assert( conn->c_sasl_bind_mech == NULL );
 228 #endif
 229                 }
 230
 231                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 232
 233                 edn = NULL;
 234                 rc = slap_sasl_bind( conn, op, dn, ndn, saslmech, &cred,
 235                         &edn, &ssf );
 236
 237                 if( rc == LDAP_SUCCESS ) {
 238                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 239                         conn->c_dn = edn;
 240                         conn->c_authmech = mech;
 241                         if( ssf ) conn->c_sasl_layers++;
 242                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 243
 244                 } else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
 245                         conn->c_sasl_bind_mech = mech;
 246                 }
 247
 248                 mech = NULL;
 249
 250                 goto cleanup;
 251
 252         } else {
 253                 /* Not SASL, cancel any in-progress bind */
 254                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 255
 256                 if ( conn->c_sasl_bind_mech != NULL ) {
 257                         assert( conn->c_sasl_bind_in_progress );
 258
 259                         free(conn->c_sasl_bind_mech);
 260                         conn->c_sasl_bind_mech = NULL;
 261
 262                 } else {
 263                         assert( !conn->c_sasl_bind_in_progress );
 264                 }
 265
 266                 slap_sasl_reset( conn );
 267                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 268         }
 269
 270         /* accept "anonymous" binds */
 271         if ( cred.bv_len == 0 || ndn == NULL || *ndn == '\0' ) {
 272                 /*
 273                  * we already forced connection to "anonymous",
 274                  * just need to send success
 275                  */
 276                 send_ldap_result( conn, op, LDAP_SUCCESS,
 277                         NULL, NULL, NULL, NULL );
 278                 Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
 279                         version, 0, 0 );
 280                 goto cleanup;
 281         }
 282
 283         /*
 284          * We could be serving multiple database backends.  Select the
 285          * appropriate one, or send a referral to our "referral server"
 286          * if we don't hold it.
 287          */
 288
 289         if ( (be = select_backend( ndn )) == NULL ) {
 290                 if ( default_referral ) {
 291                         send_ldap_result( conn, op, rc = LDAP_REFERRAL,
 292                                 NULL, NULL, default_referral, NULL );
 293
 294                 } else {
 295                         /* noSuchObject is not allowed to be returned by bind */
 296                         send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
 297                                 NULL, NULL, NULL, NULL );
 298                 }
 299
 300                 goto cleanup;
 301         }
 302
 303         conn->c_authz_backend = be;
 304
 305         /* make sure this backend recongizes critical controls */
 306         rc = backend_check_controls( be, conn, op, &text ) ;
 307
 308         if( rc != LDAP_SUCCESS ) {
 309                 send_ldap_result( conn, op, rc,
 310                         NULL, text, NULL, NULL );
 311                 goto cleanup;
 312         }
 313
 314         if ( be->be_bind ) {
 315                 int ret;
 316                 /* alias suffix */
 317                 char *edn = NULL;
 318
 319                 /* deref suffix alias if appropriate */
 320                 ndn = suffix_alias( be, ndn );
 321
 322                 ret = (*be->be_bind)( be, conn, op, dn, ndn,
 323                         method, &cred, &edn );
 324
 325                 if ( ret == 0 ) {
 326                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 327
 328                         conn->c_cdn = dn;
 329                         dn = NULL;
 330
 331                         if(edn != NULL) {
 332                                 conn->c_dn = edn;
 333                         } else {
 334                                 conn->c_dn = ndn;
 335                                 ndn = NULL;
 336                         }
 337
 338                         Debug( LDAP_DEBUG_TRACE, "do_bind: v%d bind: \"%s\" to \"%s\"\n",
 339                         version, conn->c_cdn, conn->c_dn );
 340
 341                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 342
 343                         /* send this here to avoid a race condition */
 344                         send_ldap_result( conn, op, LDAP_SUCCESS,
 345                                 NULL, NULL, NULL, NULL );
 346
 347                 } else if (edn != NULL) {
 348                         free( edn );
 349                 }
 350
 351         } else {
 352                 send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
 353                         NULL, "operation not supported within namingContext", NULL, NULL );
 354         }
 355
 356 cleanup:
 357         if( rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 358                 ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 359
 360                 /* dispose of mech */
 361                 free( conn->c_sasl_bind_mech );
 362                 conn->c_sasl_bind_mech = NULL;
 363
 364                 ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 365         }
 366
 367         if( dn != NULL ) {
 368                 free( dn );
 369         }
 370         if( ndn != NULL ) {
 371                 free( ndn );
 372         }
 373         if ( mech != NULL ) {
 374                 free( mech );
 375         }
 376         if ( cred.bv_val != NULL ) {
 377                 free( cred.bv_val );
 378         }
 379
 380         return rc;
 381 }