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                 sasl_host = ldap_pvt_get_fqdn( NULL );
 200         }
 201
 202         Debug( LDAP_DEBUG_TRACE,
 203                 "slap_sasl_init: %s initialized!\n",
 204                 sasl_host, 0, 0 );
 205
 206         /* default security properties */
 207         memset( &sasl_secprops, '\0', sizeof(sasl_secprops) );
 208     sasl_secprops.max_ssf = INT_MAX;
 209     sasl_secprops.maxbufsize = 65536;
 210     sasl_secprops.security_flags = SASL_SEC_NOPLAINTEXT|SASL_SEC_NOANONYMOUS;
 211
 212 #ifdef SLAPD_SPASSWD
 213         lutil_passwd_sasl_conn = server;
 214 #else
 215         sasl_dispose( &server );
 216 #endif
 217
 218 #endif
 219         return 0;
 220 }
 221
 222 int slap_sasl_destroy( void )
 223 {
 224 #ifdef HAVE_CYRUS_SASL
 225 #ifdef SLAPD_SPASSWD
 226         sasl_dispose( &lutil_passwd_sasl_conn );
 227 #endif
 228         sasl_done();
 229 #endif
 230         return 0;
 231 }
 232
 233 int slap_sasl_open( Connection *conn )
 234 {
 235         int sc = LDAP_SUCCESS;
 236
 237 #ifdef HAVE_CYRUS_SASL
 238         sasl_conn_t *ctx = NULL;
 239         sasl_callback_t *session_callbacks;
 240
 241         assert( conn->c_sasl_context == NULL );
 242         assert( conn->c_sasl_extra == NULL );
 243
 244         conn->c_sasl_layers = 0;
 245
 246         session_callbacks =
 247                 ch_calloc( 3, sizeof(sasl_callback_t));
 248         conn->c_sasl_extra = session_callbacks;
 249
 250         session_callbacks[0].id = SASL_CB_LOG;
 251         session_callbacks[0].proc = &slap_sasl_log;
 252         session_callbacks[0].context = conn;
 253
 254         session_callbacks[1].id = SASL_CB_PROXY_POLICY;
 255         session_callbacks[1].proc = &slap_sasl_authorize;
 256         session_callbacks[1].context = conn;
 257
 258         session_callbacks[2].id = SASL_CB_LIST_END;
 259         session_callbacks[2].proc = NULL;
 260         session_callbacks[2].context = NULL;
 261
 262         /* create new SASL context */
 263         sc = sasl_server_new( "ldap", sasl_host, global_realm,
 264                 session_callbacks, SASL_SECURITY_LAYER, &ctx );
 265
 266         if( sc != SASL_OK ) {
 267                 Debug( LDAP_DEBUG_ANY, "sasl_server_new failed: %d\n",
 268                         sc, 0, 0 );
 269                 return -1;
 270         }
 271
 272         conn->c_sasl_context = ctx;
 273
 274         if( sc == SASL_OK ) {
 275                 sc = sasl_setprop( ctx,
 276                         SASL_SEC_PROPS, &sasl_secprops );
 277
 278                 if( sc != SASL_OK ) {
 279                         Debug( LDAP_DEBUG_ANY, "sasl_setprop failed: %d\n",
 280                                 sc, 0, 0 );
 281                         slap_sasl_close( conn );
 282                         return -1;
 283                 }
 284         }
 285
 286         sc = slap_sasl_err2ldap( sc );
 287 #endif
 288         return sc;
 289 }
 290
 291 int slap_sasl_external(
 292         Connection *conn,
 293         slap_ssf_t ssf,
 294         char *auth_id )
 295 {
 296 #ifdef HAVE_CYRUS_SASL
 297         int sc;
 298         sasl_conn_t *ctx = conn->c_sasl_context;
 299         sasl_external_properties_t extprops;
 300
 301         if ( ctx == NULL ) {
 302                 return LDAP_UNAVAILABLE;
 303         }
 304
 305         memset( &extprops, '\0', sizeof(extprops) );
 306         extprops.ssf = ssf;
 307         extprops.auth_id = auth_id;
 308
 309         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
 310                 (void *) &extprops );
 311
 312         if ( sc != SASL_OK ) {
 313                 return LDAP_OTHER;
 314         }
 315 #endif
 316
 317         return LDAP_SUCCESS;
 318 }
 319
 320 int slap_sasl_reset( Connection *conn )
 321 {
 322 #ifdef HAVE_CYRUS_SASL
 323         sasl_conn_t *ctx = conn->c_sasl_context;
 324
 325         if( ctx != NULL ) {
 326         }
 327 #endif
 328         /* must return "anonymous" */
 329         return LDAP_SUCCESS;
 330 }
 331
 332 char ** slap_sasl_mechs( Connection *conn )
 333 {
 334         char **mechs = NULL;
 335
 336 #ifdef HAVE_CYRUS_SASL
 337         sasl_conn_t *ctx = conn->c_sasl_context;
 338
 339         if( ctx != NULL ) {
 340                 int sc;
 341                 char *mechstr;
 342
 343                 sc = sasl_listmech( ctx,
 344                         NULL, NULL, ",", NULL,
 345                         &mechstr, NULL, NULL );
 346
 347                 if( sc != SASL_OK ) {
 348                         Debug( LDAP_DEBUG_ANY, "slap_sasl_listmech failed: %d\n",
 349                                 sc, 0, 0 );
 350                         return NULL;
 351                 }
 352
 353                 mechs = str2charray( mechstr, "," );
 354
 355                 ch_free( mechstr );
 356         }
 357 #endif
 358
 359         return mechs;
 360 }
 361
 362 int slap_sasl_close( Connection *conn )
 363 {
 364 #ifdef HAVE_CYRUS_SASL
 365         sasl_conn_t *ctx = conn->c_sasl_context;
 366
 367         if( ctx != NULL ) {
 368                 sasl_dispose( &ctx );
 369         }
 370
 371         conn->c_sasl_context = NULL;
 372
 373         free( conn->c_sasl_extra );
 374         conn->c_sasl_extra = NULL;
 375 #endif
 376
 377         return LDAP_SUCCESS;
 378 }
 379
 380 int slap_sasl_bind(
 381     Connection          *conn,
 382     Operation           *op,
 383     const char          *dn,
 384     const char          *ndn,
 385     const char          *mech,
 386     struct berval       *cred,
 387         char                            **edn,
 388         slap_ssf_t                      *ssfp )
 389 {
 390         int rc = 1;
 391
 392 #ifdef HAVE_CYRUS_SASL
 393         sasl_conn_t *ctx = conn->c_sasl_context;
 394         struct berval response;
 395         unsigned reslen;
 396         const char *errstr;
 397         int sc;
 398
 399         Debug(LDAP_DEBUG_ARGS,
 400                 "==> sasl_bind: dn=\"%s\" mech=%s datalen=%d\n",
 401                 dn, mech ? mech : "<continuing>", cred ? cred->bv_len : 0 );
 402
 403         if( ctx == NULL ) {
 404                 send_ldap_result( conn, op, LDAP_UNAVAILABLE,
 405                         NULL, "SASL unavailable on this session", NULL, NULL );
 406                 return rc;
 407         }
 408
 409         if ( mech != NULL ) {
 410                 sc = sasl_server_start( ctx,
 411                         mech,
 412                         cred->bv_val, cred->bv_len,
 413                         (char **)&response.bv_val, &reslen, &errstr );
 414
 415         } else {
 416                 sc = sasl_server_step( ctx,
 417                         cred->bv_val, cred->bv_len,
 418                         (char **)&response.bv_val, &reslen, &errstr );
 419         }
 420
 421         response.bv_len = reslen;
 422
 423         if ( sc == SASL_OK ) {
 424                 char *username = NULL;
 425
 426                 sc = sasl_getprop( ctx,
 427                         SASL_USERNAME, (void **)&username );
 428
 429                 if ( sc != SASL_OK ) {
 430                         Debug(LDAP_DEBUG_TRACE,
 431                                 "slap_sasl_bind: getprop(USERNAME) failed!\n",
 432                                 0, 0, 0);
 433
 434                         send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
 435                                 NULL, "no SASL username", NULL, NULL );
 436
 437                 } else if ( username == NULL || *username == '\0' ) {
 438                         Debug(LDAP_DEBUG_TRACE,
 439                                 "slap_sasl_bind: getprop(USERNAME) returned NULL!\n",
 440                                 0, 0, 0);
 441
 442                         send_ldap_result( conn, op, rc = LDAP_INSUFFICIENT_ACCESS,
 443                                 NULL, "no SASL username", NULL, NULL );
 444
 445                 } else {
 446                         char *realm = NULL;
 447                         sasl_ssf_t *ssf = NULL;
 448
 449                         (void) sasl_getprop( ctx,
 450                                 SASL_REALM, (void **)&realm );
 451
 452                         (void) sasl_getprop( ctx,
 453                                 SASL_SSF, (void *)&ssf );
 454
 455                         Debug(LDAP_DEBUG_TRACE,
 456                                 "slap_sasl_bind: username=\"%s\" realm=\"%s\" ssf=%lu\n",
 457                                 username ? username : "",
 458                                 realm ? realm : "",
 459                                 (unsigned long) ( ssf ? *ssf : 0 ) );
 460
 461                         *ssfp = ssf ? *ssf : 0;
 462
 463                         rc = LDAP_SUCCESS;
 464
 465                         if( username == NULL || (
 466                                 !strncasecmp( username, "anonymous", sizeof("anonymous")-1 ) &&
 467                                 ( username[sizeof("anonymous")-1] == '\0' ||
 468                                   username[sizeof("anonymous")-1] == '@' ) ) )
 469                         {
 470                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: anonymous\n",
 471                                         0, 0, 0);
 472
 473                         } else if ( username[0] == 'u' && username[1] == ':'
 474                                 && username[2] != '\0'
 475                                 && strpbrk( &username[2], "+=,;\"\\ \t") == NULL )
 476                         {
 477                                 *edn = ch_malloc( sizeof( "uid= + realm=" )
 478                                         + strlen( &username[2] )
 479                                         + ( realm ? strlen( realm ) : 0 ) );
 480
 481                                 strcpy( *edn, "uid=" );
 482                                 strcat( *edn, &username[2] );
 483
 484                                 if( realm && *realm ) {
 485                                         strcat( *edn, " + realm=" );
 486                                         strcat( *edn, realm );
 487                                 }
 488
 489                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: authzdn: \"%s\"\n",
 490                                         *edn, 0, 0);
 491
 492                         } else {
 493                                 rc = LDAP_INAPPROPRIATE_AUTH;
 494                                 errstr = "authorization disallowed";
 495                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: %s\n",
 496                                         errstr, 0, 0);
 497                         }
 498
 499                         if( rc == LDAP_SUCCESS ) {
 500                                 send_ldap_sasl( conn, op, rc,
 501                                         NULL, NULL, NULL, NULL,
 502                                         response.bv_len ? &response : NULL );
 503
 504                         } else {
 505                                 send_ldap_result( conn, op, rc,
 506                                         NULL, errstr, NULL, NULL );
 507                         }
 508                 }
 509
 510         } else if ( sc == SASL_CONTINUE ) {
 511                 send_ldap_sasl( conn, op, rc = LDAP_SASL_BIND_IN_PROGRESS,
 512                         NULL, NULL, NULL, NULL, &response );
 513
 514         } else {
 515                 send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
 516                         NULL, errstr, NULL, NULL );
 517         }
 518
 519         Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: rc=%d\n", rc, 0, 0);
 520
 521 #else
 522         send_ldap_result( conn, op, rc = LDAP_UNAVAILABLE,
 523                 NULL, "SASL not supported", NULL, NULL );
 524 #endif
 525
 526         return rc;
 527 }
 528
 529 char* slap_sasl_secprops( const char *in )
 530 {
 531 #ifdef HAVE_CYRUS_SASL
 532         int rc = ldap_pvt_sasl_secprops( in, &sasl_secprops );
 533
 534         return rc == LDAP_SUCCESS ? NULL : "Invalid security properties";
 535 #else
 536         return "SASL not supported";
 537 #endif
 538 }