git.sur5r.net Git - openldap/blob - servers/slapd/sasl.c

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6
   7 #include "portable.h"
   8
   9 #include <ac/stdlib.h>
  10 #include <stdio.h>
  11
  12 #include "slap.h"
  13 #include "proto-slap.h"
  14
  15 #include <lber.h>
  16 #include <ldap_log.h>
  17
  18 #ifdef HAVE_CYRUS_SASL
  19 #include <limits.h>
  20 #include <sasl.h>
  21
  22 #include <ldap_pvt.h>
  23
  24 #ifdef SLAPD_SPASSWD
  25 #include <lutil.h>
  26 #endif
  27
  28 static char *sasl_host = NULL;
  29 static sasl_security_properties_t sasl_secprops;
  30
  31
  32 static int
  33 slap_sasl_log(
  34         void *context,
  35         int priority,
  36         const char *message)
  37 {
  38         Connection *conn = context;
  39         int level;
  40         const char * label;
  41
  42         if ( message == NULL ) {
  43                 return SASL_BADPARAM;
  44         }
  45
  46         switch (priority) {
  47         case SASL_LOG_ERR:
  48                 level = LDAP_DEBUG_ANY;
  49                 label = "Error";
  50                 break;
  51         case SASL_LOG_WARNING:
  52                 level = LDAP_DEBUG_TRACE;
  53                 label = "Warning";
  54                 break;
  55         case SASL_LOG_INFO:
  56                 level = LDAP_DEBUG_TRACE;
  57                 label = "Info";
  58                 break;
  59         default:
  60                 return SASL_BADPARAM;
  61         }
  62
  63         Debug( level, "SASL [conn=%d] %s: %s\n",
  64                 conn ? conn->c_connid: -1,
  65                 label, message );
  66
  67         return SASL_OK;
  68 }
  69
  70 static int
  71 slap_sasl_authorize(
  72         void *context,
  73         const char *authcid,
  74         const char *authzid,
  75         const char **user,
  76         const char **errstr)
  77 {
  78         Connection *conn = context;
  79
  80         *user = NULL;
  81
  82         if ( authcid == NULL || *authcid == '\0' ) {
  83                 *errstr = "empty authentication identity";
  84
  85                 Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
  86                         "empty authentication identity\n",
  87                         (long) (conn ? conn->c_connid : -1),
  88                         0, 0 );
  89                 return SASL_BADAUTH;
  90         }
  91
  92         Debug( LDAP_DEBUG_ARGS, "SASL Authorize [conn=%ld]: "
  93                 "authcid=\"%s\" authzid=\"%s\"\n",
  94                 (long) (conn ? conn->c_connid : -1),
  95                 authcid ? authcid : "<empty>",
  96                 authcid ? authcid : "<empty>" );
  97
  98         if ( authzid == NULL || *authzid == '\0' ||
  99                 strcmp( authcid, authzid ) == 0 )
 100         {
 101                 char* cuser;
 102                 size_t len = sizeof("u:") + strlen( authcid );
 103
 104                 cuser = ch_malloc( len );
 105                 strcpy( cuser, "u:" );
 106                 strcpy( &cuser[sizeof("u:")-1], authcid );
 107
 108                 *user = cuser;
 109
 110                 Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
 111                         "\"%s\" as \"%s\"\n",
 112                         (long) (conn ? conn->c_connid : -1),
 113                         authcid, cuser );
 114
 115                 return SASL_OK;
 116         }
 117
 118         Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
 119                 "\"%s\" as \"%s\" disallowed. No policy.\n",
 120                 (long) (conn ? conn->c_connid : -1),
 121                 authcid, authzid );
 122
 123         *errstr = "no proxy policy";
 124     return SASL_NOAUTHZ;
 125 }
 126
 127
 128 static int
 129 slap_sasl_err2ldap( int saslerr )
 130 {
 131         int rc;
 132
 133         switch (saslerr) {
 134                 case SASL_CONTINUE:
 135                         rc = LDAP_SASL_BIND_IN_PROGRESS;
 136                         break;
 137                 case SASL_FAIL:
 138                         rc = LDAP_OTHER;
 139                         break;
 140                 case SASL_NOMEM:
 141                         rc = LDAP_OTHER;
 142                         break;
 143                 case SASL_NOMECH:
 144                         rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 145                         break;
 146                 case SASL_BADAUTH:
 147                         rc = LDAP_INVALID_CREDENTIALS;
 148                         break;
 149                 case SASL_NOAUTHZ:
 150                         rc = LDAP_INSUFFICIENT_ACCESS;
 151                         break;
 152                 case SASL_TOOWEAK:
 153                 case SASL_ENCRYPT:
 154                         rc = LDAP_INAPPROPRIATE_AUTH;
 155                         break;
 156                 default:
 157                         rc = LDAP_OTHER;
 158                         break;
 159         }
 160
 161         return rc;
 162 }
 163 #endif
 164
 165
 166 int slap_sasl_init( void )
 167 {
 168 #ifdef HAVE_CYRUS_SASL
 169         int rc;
 170         sasl_conn_t *server = NULL;
 171         static sasl_callback_t server_callbacks[] = {
 172                 { SASL_CB_LOG, &slap_sasl_log, NULL },
 173                 { SASL_CB_LIST_END, NULL, NULL }
 174         };
 175
 176         sasl_set_alloc(
 177                 ch_malloc,
 178                 ch_calloc,
 179                 ch_realloc,
 180                 ch_free );
 181
 182         sasl_set_mutex(
 183                 ldap_pvt_sasl_mutex_new,
 184                 ldap_pvt_sasl_mutex_lock,
 185                 ldap_pvt_sasl_mutex_unlock,
 186                 ldap_pvt_sasl_mutex_dispose );
 187
 188         /* should provide callbacks for logging */
 189         /* server name should be configurable */
 190         rc = sasl_server_init( server_callbacks, "slapd" );
 191
 192         if( rc != SASL_OK ) {
 193                 Debug( LDAP_DEBUG_ANY, "sasl_server_init failed\n",
 194                         0, 0, 0 );
 195                 return -1;
 196         }
 197
 198         if( sasl_host == NULL ) {
 199                 static char hostname[MAXHOSTNAMELEN+1];
 200
 201                 if( gethostname( hostname, MAXHOSTNAMELEN ) == 0 ) {
 202                         hostname[MAXHOSTNAMELEN] = '\0';
 203                         sasl_host = hostname;
 204                 }
 205         }
 206
 207         Debug( LDAP_DEBUG_TRACE,
 208                 "slap_sasl_init: %s initialized!\n",
 209                 sasl_host, 0, 0 );
 210
 211         /* default security properties */
 212         memset( &sasl_secprops, '\0', sizeof(sasl_secprops) );
 213     sasl_secprops.max_ssf = UINT_MAX;
 214     sasl_secprops.maxbufsize = 65536;
 215     sasl_secprops.security_flags = SASL_SEC_NOPLAINTEXT|SASL_SEC_NOANONYMOUS;
 216
 217 #ifdef SLAPD_SPASSWD
 218         lutil_passwd_sasl_conn = server;
 219 #else
 220         sasl_dispose( &server );
 221 #endif
 222
 223 #endif
 224         return 0;
 225 }
 226
 227 int slap_sasl_destroy( void )
 228 {
 229 #ifdef HAVE_CYRUS_SASL
 230 #ifdef SLAPD_SPASSWD
 231         sasl_dispose( &lutil_passwd_sasl_conn );
 232 #endif
 233         sasl_done();
 234 #endif
 235         return 0;
 236 }
 237
 238 int slap_sasl_open( Connection *conn )
 239 {
 240         int sc = LDAP_SUCCESS;
 241
 242 #ifdef HAVE_CYRUS_SASL
 243         sasl_conn_t *ctx = NULL;
 244         sasl_callback_t *session_callbacks;
 245
 246         assert( conn->c_sasl_context == NULL );
 247         assert( conn->c_sasl_extra == NULL );
 248
 249         conn->c_sasl_layers = 0;
 250
 251         session_callbacks =
 252                 ch_calloc( 3, sizeof(sasl_callback_t));
 253         conn->c_sasl_extra = session_callbacks;
 254
 255         session_callbacks[0].id = SASL_CB_LOG;
 256         session_callbacks[0].proc = &slap_sasl_log;
 257         session_callbacks[0].context = conn;
 258
 259         session_callbacks[1].id = SASL_CB_PROXY_POLICY;
 260         session_callbacks[1].proc = &slap_sasl_authorize;
 261         session_callbacks[1].context = conn;
 262
 263         session_callbacks[2].id = SASL_CB_LIST_END;
 264         session_callbacks[2].proc = NULL;
 265         session_callbacks[2].context = NULL;
 266
 267         /* create new SASL context */
 268         sc = sasl_server_new( "ldap", sasl_host, global_realm,
 269                 session_callbacks, SASL_SECURITY_LAYER, &ctx );
 270
 271         if( sc != SASL_OK ) {
 272                 Debug( LDAP_DEBUG_ANY, "sasl_server_new failed: %d\n",
 273                         sc, 0, 0 );
 274                 return -1;
 275         }
 276
 277         conn->c_sasl_context = ctx;
 278
 279         if( sc == SASL_OK ) {
 280                 sc = sasl_setprop( ctx,
 281                         SASL_SEC_PROPS, &sasl_secprops );
 282
 283                 if( sc != SASL_OK ) {
 284                         Debug( LDAP_DEBUG_ANY, "sasl_setprop failed: %d\n",
 285                                 sc, 0, 0 );
 286                         slap_sasl_close( conn );
 287                         return -1;
 288                 }
 289         }
 290
 291         sc = slap_sasl_err2ldap( sc );
 292 #endif
 293         return sc;
 294 }
 295
 296 int slap_sasl_external(
 297         Connection *conn,
 298         unsigned ssf,
 299         char *auth_id )
 300 {
 301 #ifdef HAVE_CYRUS_SASL
 302         int sc;
 303         sasl_conn_t *ctx = conn->c_sasl_context;
 304         sasl_external_properties_t extprops;
 305
 306         if ( ctx == NULL ) {
 307                 return LDAP_UNAVAILABLE;
 308         }
 309
 310         memset( &extprops, 0L, sizeof(extprops) );
 311         extprops.ssf = ssf;
 312         extprops.auth_id = auth_id;
 313
 314         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
 315                 (void *) &extprops );
 316
 317         if ( sc != SASL_OK ) {
 318                 return LDAP_OTHER;
 319         }
 320 #endif
 321
 322         return LDAP_SUCCESS;
 323 }
 324
 325 int slap_sasl_reset( Connection *conn )
 326 {
 327 #ifdef HAVE_CYRUS_SASL
 328         sasl_conn_t *ctx = conn->c_sasl_context;
 329
 330         if( ctx != NULL ) {
 331         }
 332 #endif
 333         /* must return "anonymous" */
 334         return LDAP_SUCCESS;
 335 }
 336
 337 char ** slap_sasl_mechs( Connection *conn )
 338 {
 339         char **mechs = NULL;
 340
 341 #ifdef HAVE_CYRUS_SASL
 342         sasl_conn_t *ctx = conn->c_sasl_context;
 343
 344         if( ctx != NULL ) {
 345                 int sc;
 346                 char *mechstr;
 347
 348                 sc = sasl_listmech( ctx,
 349                         NULL, NULL, ",", NULL,
 350                         &mechstr, NULL, NULL );
 351
 352                 if( sc != SASL_OK ) {
 353                         Debug( LDAP_DEBUG_ANY, "slap_sasl_listmech failed: %d\n",
 354                                 sc, 0, 0 );
 355                         return NULL;
 356                 }
 357
 358                 mechs = str2charray( mechstr, "," );
 359
 360                 ch_free( mechstr );
 361         }
 362 #endif
 363
 364         return mechs;
 365 }
 366
 367 int slap_sasl_close( Connection *conn )
 368 {
 369 #ifdef HAVE_CYRUS_SASL
 370         sasl_conn_t *ctx = conn->c_sasl_context;
 371
 372         if( ctx != NULL ) {
 373                 sasl_dispose( &ctx );
 374         }
 375
 376         conn->c_sasl_context = NULL;
 377
 378         free( conn->c_sasl_extra );
 379         conn->c_sasl_extra = NULL;
 380 #endif
 381
 382         return LDAP_SUCCESS;
 383 }
 384
 385 int slap_sasl_bind(
 386     Connection          *conn,
 387     Operation           *op,
 388     const char          *dn,
 389     const char          *ndn,
 390     const char          *mech,
 391     struct berval       *cred,
 392         char                            **edn,
 393         unsigned long           *ssfp )
 394 {
 395         int rc = 1;
 396
 397 #ifdef HAVE_CYRUS_SASL
 398         sasl_conn_t *ctx = conn->c_sasl_context;
 399         struct berval response;
 400         unsigned reslen;
 401         const char *errstr;
 402         int sc;
 403
 404         Debug(LDAP_DEBUG_ARGS,
 405                 "==> sasl_bind: dn=\"%s\" mech=%s datalen=%d\n",
 406                 dn, mech ? mech : "<continuing>", cred ? cred->bv_len : 0 );
 407
 408         if( ctx == NULL ) {
 409                 send_ldap_result( conn, op, LDAP_UNAVAILABLE,
 410                         NULL, "SASL unavailable on this session", NULL, NULL );
 411                 return rc;
 412         }
 413
 414         if ( mech != NULL ) {
 415                 sc = sasl_server_start( ctx,
 416                         mech,
 417                         cred->bv_val, cred->bv_len,
 418                         (char **)&response.bv_val, &reslen, &errstr );
 419
 420         } else {
 421                 sc = sasl_server_step( ctx,
 422                         cred->bv_val, cred->bv_len,
 423                         (char **)&response.bv_val, &reslen, &errstr );
 424         }
 425
 426         response.bv_len = reslen;
 427
 428         if ( sc == SASL_OK ) {
 429                 char *username = NULL;
 430
 431                 sc = sasl_getprop( ctx,
 432                         SASL_USERNAME, (void **)&username );
 433
 434                 if ( sc != SASL_OK ) {
 435                         Debug(LDAP_DEBUG_TRACE,
 436                                 "slap_sasl_bind: getprop(USERNAME) failed!\n",
 437                                 0, 0, 0);
 438
 439                         send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
 440                                 NULL, "no SASL username", NULL, NULL );
 441
 442                 } else if ( username == NULL || *username == '\0' ) {
 443                         Debug(LDAP_DEBUG_TRACE,
 444                                 "slap_sasl_bind: getprop(USERNAME) returned NULL!\n",
 445                                 0, 0, 0);
 446
 447                         send_ldap_result( conn, op, rc = LDAP_INSUFFICIENT_ACCESS,
 448                                 NULL, "no SASL username", NULL, NULL );
 449
 450                 } else {
 451                         char *realm = NULL;
 452                         sasl_ssf_t *ssf = NULL;
 453
 454                         (void) sasl_getprop( ctx,
 455                                 SASL_REALM, (void **)&realm );
 456
 457                         (void) sasl_getprop( ctx,
 458                                 SASL_SSF, (void *)&ssf );
 459
 460                         Debug(LDAP_DEBUG_TRACE,
 461                                 "slap_sasl_bind: username=\"%s\" realm=\"%s\" ssf=%lu\n",
 462                                 username ? username : "",
 463                                 realm ? realm : "",
 464                                 (unsigned long) ( ssf ? *ssf : 0 ) );
 465
 466                         *ssfp = ssf ? *ssf : 0;
 467
 468                         rc = LDAP_SUCCESS;
 469
 470                         if( username == NULL || (
 471                                 !strncasecmp( username, "anonymous", sizeof("anonyous")-1 ) &&
 472                                 ( ( username[sizeof("anonymous")] == '\0' ) ||
 473                                   ( username[sizeof("anonymous")] == '@' ) ) ) )
 474                         {
 475                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: anonymous\n",
 476                                         0, 0, 0);
 477
 478                         } else if ( username[0] == 'u' && username[1] == ':'
 479                                 && username[2] != '\0'
 480                                 && strpbrk( &username[2], "=,;\"\\") == NULL )
 481                         {
 482                                 *edn = ch_malloc( sizeof( "uid= + realm=" )
 483                                         + strlen( &username[2] )
 484                                         + ( realm ? strlen( realm ) : 0 ) );
 485
 486                                 strcpy( *edn, "uid=" );
 487                                 strcat( *edn, &username[2] );
 488
 489                                 if( realm && *realm ) {
 490                                         strcat( *edn, " + realm=" );
 491                                         strcat( *edn, realm );
 492                                 }
 493
 494                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: authzdn: \"%s\"\n",
 495                                         *edn, 0, 0);
 496
 497                         } else {
 498                                 rc = LDAP_INAPPROPRIATE_AUTH;
 499                                 errstr = "authorization disallowed";
 500                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: %s\n",
 501                                         errstr, 0, 0);
 502                         }
 503
 504                         if( rc == LDAP_SUCCESS ) {
 505                                 send_ldap_sasl( conn, op, rc,
 506                                         NULL, NULL, NULL, NULL,
 507                                         response.bv_len ? &response : NULL );
 508
 509                         } else {
 510                                 send_ldap_result( conn, op, rc,
 511                                         NULL, errstr, NULL, NULL );
 512                         }
 513                 }
 514
 515         } else if ( sc == SASL_CONTINUE ) {
 516                 send_ldap_sasl( conn, op, rc = LDAP_SASL_BIND_IN_PROGRESS,
 517                         NULL, NULL, NULL, NULL, &response );
 518
 519         } else {
 520                 send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
 521                         NULL, errstr, NULL, NULL );
 522         }
 523
 524         Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: rc=%d\n", rc, 0, 0);
 525
 526 #else
 527         send_ldap_result( conn, op, rc = LDAP_UNAVAILABLE,
 528                 NULL, "SASL not supported", NULL, NULL );
 529 #endif
 530
 531         return rc;
 532 }
 533
 534 char* slap_sasl_secprops( const char *in )
 535 {
 536 #ifdef HAVE_CYRUS_SASL
 537         int rc = ldap_pvt_sasl_secprops( in, &sasl_secprops );
 538
 539         return rc == LDAP_SUCCESS ? NULL : "Invalid security properties";
 540 #else
 541         return "SASL not supported";
 542 #endif
 543 }