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 sasl_cb_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         char *canon = NULL;
  80
  81         if ( authcid == NULL || *authcid == '\0' ) {
  82                 *errstr = "empty authentication identity";
  83
  84                 Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
  85                         "empty authentication identity\n",
  86                         (long) (conn ? conn->c_connid : -1),
  87                         0, 0 );
  88                 return SASL_BADAUTH;
  89         }
  90
  91         if ( authzid == NULL || *authzid == '\0' ||
  92                 strcmp( authcid, authzid ) == 0 )
  93         {
  94                 size_t len = sizeof("u:") + strlen( authcid );
  95                 canon = ch_malloc( len );
  96                 strcpy( canon, "u:" );
  97                 strcpy( &canon[sizeof("u:")-1], authcid );
  98
  99                 *user = canon;
 100
 101                 Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
 102                         "\"%s\" as \"%s\"\n",
 103                         (long) (conn ? conn->c_connid : -1),
 104                         authcid, canon );
 105                 return SASL_OK;
 106         }
 107
 108         Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
 109                 "\"%s\" as \"%s\" disallowed. No policy.\n",
 110                 (long) (conn ? conn->c_connid : -1),
 111                 authcid, authzid );
 112
 113         *errstr = "no proxy policy";
 114     return SASL_BADAUTH;
 115 }
 116
 117
 118 static int
 119 slap_sasl_err2ldap( int saslerr )
 120 {
 121         int rc;
 122
 123         switch (saslerr) {
 124                 case SASL_CONTINUE:
 125                         rc = LDAP_SASL_BIND_IN_PROGRESS;
 126                         break;
 127                 case SASL_FAIL:
 128                         rc = LDAP_OTHER;
 129                         break;
 130                 case SASL_NOMEM:
 131                         rc = LDAP_OTHER;
 132                         break;
 133                 case SASL_NOMECH:
 134                         rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 135                         break;
 136                 case SASL_BADAUTH:
 137                         rc = LDAP_INVALID_CREDENTIALS;
 138                         break;
 139                 case SASL_NOAUTHZ:
 140                         rc = LDAP_INSUFFICIENT_ACCESS;
 141                         break;
 142                 case SASL_TOOWEAK:
 143                 case SASL_ENCRYPT:
 144                         rc = LDAP_INAPPROPRIATE_AUTH;
 145                         break;
 146                 default:
 147                         rc = LDAP_OTHER;
 148                         break;
 149         }
 150
 151         return rc;
 152 }
 153 #endif
 154
 155
 156 int slap_sasl_init( void )
 157 {
 158 #ifdef HAVE_CYRUS_SASL
 159         int rc;
 160         sasl_conn_t *server = NULL;
 161         static sasl_callback_t server_callbacks[] = {
 162                 { SASL_CB_LOG, &sasl_cb_log, NULL },
 163                 { SASL_CB_LIST_END, NULL, NULL }
 164         };
 165
 166         sasl_set_alloc(
 167                 ch_malloc,
 168                 ch_calloc,
 169                 ch_realloc,
 170                 ch_free );
 171
 172         sasl_set_mutex(
 173                 ldap_pvt_sasl_mutex_new,
 174                 ldap_pvt_sasl_mutex_lock,
 175                 ldap_pvt_sasl_mutex_unlock,
 176                 ldap_pvt_sasl_mutex_dispose );
 177
 178         /* should provide callbacks for logging */
 179         /* server name should be configurable */
 180         rc = sasl_server_init( server_callbacks, "slapd" );
 181
 182         if( rc != SASL_OK ) {
 183                 Debug( LDAP_DEBUG_ANY, "sasl_server_init failed\n",
 184                         0, 0, 0 );
 185                 return -1;
 186         }
 187
 188         if( sasl_host == NULL ) {
 189                 static char hostname[MAXHOSTNAMELEN+1];
 190
 191                 if( gethostname( hostname, MAXHOSTNAMELEN ) == 0 ) {
 192                         hostname[MAXHOSTNAMELEN] = '\0';
 193                         sasl_host = hostname;
 194                 }
 195         }
 196
 197         Debug( LDAP_DEBUG_TRACE,
 198                 "slap_sasl_init: %s initialized!\n",
 199                 sasl_host, 0, 0 );
 200
 201         /* default security properties */
 202         memset( &sasl_secprops, '\0', sizeof(sasl_secprops) );
 203     sasl_secprops.max_ssf = UINT_MAX;
 204     sasl_secprops.maxbufsize = 65536;
 205     sasl_secprops.security_flags = SASL_SEC_NOPLAINTEXT|SASL_SEC_NOANONYMOUS;
 206
 207 #ifdef SLAPD_SPASSWD
 208         lutil_passwd_sasl_conn = server;
 209 #else
 210         sasl_dispose( &server );
 211 #endif
 212
 213 #endif
 214         return 0;
 215 }
 216
 217 int slap_sasl_destroy( void )
 218 {
 219 #ifdef HAVE_CYRUS_SASL
 220 #ifdef SLAPD_SPASSWD
 221         sasl_dispose( &lutil_passwd_sasl_conn );
 222 #endif
 223         sasl_done();
 224 #endif
 225         return 0;
 226 }
 227
 228 int slap_sasl_open( Connection *conn )
 229 {
 230         int sc = LDAP_SUCCESS;
 231
 232 #ifdef HAVE_CYRUS_SASL
 233         sasl_conn_t *ctx = NULL;
 234         sasl_callback_t *session_callbacks;
 235
 236         assert( conn->c_sasl_context == NULL );
 237         assert( conn->c_sasl_extra == NULL );
 238
 239         session_callbacks =
 240                 ch_calloc( 3, sizeof(sasl_callback_t));
 241         conn->c_sasl_extra = session_callbacks;
 242
 243         session_callbacks[0].id = SASL_CB_LOG;
 244         session_callbacks[0].proc = &sasl_cb_log;
 245         session_callbacks[0].context = conn;
 246
 247         session_callbacks[1].id = SASL_CB_PROXY_POLICY;
 248         session_callbacks[1].proc = &slap_sasl_authorize;
 249         session_callbacks[1].context = conn;
 250
 251         session_callbacks[2].id = SASL_CB_LIST_END;
 252         session_callbacks[2].proc = NULL;
 253         session_callbacks[2].context = NULL;
 254
 255         /* create new SASL context */
 256         sc = sasl_server_new( "ldap", sasl_host, global_realm,
 257                 session_callbacks,
 258 #ifdef LDAP_SASL_SECURITY_LAYER
 259                 SASL_SECURITY_LAYER,
 260 #else
 261                 0,
 262 #endif
 263                 &ctx );
 264
 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         unsigned 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, 0L, 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         return LDAP_SUCCESS;
 377 }
 378
 379 int slap_sasl_bind(
 380     Connection          *conn,
 381     Operation           *op,
 382     const char          *dn,
 383     const char          *ndn,
 384     const char          *mech,
 385     struct berval       *cred,
 386         char                            **edn )
 387 {
 388         int rc = 1;
 389
 390 #ifdef HAVE_CYRUS_SASL
 391         sasl_conn_t *ctx = conn->c_sasl_context;
 392         struct berval response;
 393         unsigned reslen;
 394         const char *errstr;
 395         int sc;
 396
 397         Debug(LDAP_DEBUG_ARGS,
 398                 "==> sasl_bind: dn=\"%s\" mech=%s cred->bv_len=%d\n",
 399                 dn, mech, cred ? cred->bv_len : 0 );
 400
 401         if( ctx == NULL ) {
 402                 send_ldap_result( conn, op, LDAP_UNAVAILABLE,
 403                         NULL, "SASL unavailable on this session", NULL, NULL );
 404                 return rc;
 405         }
 406
 407         if ( mech != NULL ) {
 408                 sc = sasl_server_start( ctx,
 409                         mech,
 410                         cred->bv_val, cred->bv_len,
 411                         (char **)&response.bv_val, &reslen, &errstr );
 412
 413         } else {
 414                 sc = sasl_server_step( ctx,
 415                         cred->bv_val, cred->bv_len,
 416                         (char **)&response.bv_val, &reslen, &errstr );
 417         }
 418
 419         response.bv_len = reslen;
 420
 421         if ( sc == SASL_OK ) {
 422                 char *username = NULL;
 423
 424                 sc = sasl_getprop( ctx,
 425                         SASL_USERNAME, (void **)&username );
 426
 427                 if ( sc != SASL_OK ) {
 428                         Debug(LDAP_DEBUG_TRACE,
 429                                 "slap_sasl_bind: getprop(USERNAME) failed!\n",
 430                                 0, 0, 0);
 431
 432                         send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
 433                                 NULL, "no SASL username", NULL, NULL );
 434
 435                 } else if ( username == NULL || *username == '\0' ) {
 436                         Debug(LDAP_DEBUG_TRACE,
 437                                 "slap_sasl_bind: getprop(USERNAME) returned NULL!\n",
 438                                 0, 0, 0);
 439
 440                         send_ldap_result( conn, op, rc = LDAP_INSUFFICIENT_ACCESS,
 441                                 NULL, "no SASL username", NULL, NULL );
 442
 443                 } else {
 444                         char *realm = NULL;
 445                         sasl_ssf_t *ssf = NULL;
 446
 447                         (void) sasl_getprop( ctx,
 448                                 SASL_REALM, (void **)&realm );
 449
 450                         (void) sasl_getprop( ctx,
 451                                 SASL_SSF, (void *)&ssf );
 452
 453                         Debug(LDAP_DEBUG_TRACE,
 454                                 "slap_sasl_bind: username=\"%s\" realm=\"%s\" ssf=%lu\n",
 455                                 username ? username : "",
 456                                 realm ? realm : "",
 457                                 (unsigned long) ( ssf ? *ssf : 0 ) );
 458
 459                         if( !strncasecmp( username, "anonymous", sizeof("anonyous")-1 ) &&
 460                                 ( ( username[sizeof("anonymous")] == '\0' ) ||
 461                                   ( username[sizeof("anonymous")] == '@' ) ) )
 462                         {
 463                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: anonymous\n",
 464                                         0, 0, 0);
 465
 466                         } else {
 467                                 *edn = ch_malloc( sizeof( "uid= + realm=" )
 468                                         + ( username ? strlen( username ) : 0 )
 469                                         + ( realm ? strlen( realm ) : 0 ) );
 470
 471                                 strcpy( *edn, "uid=" );
 472                                 strcat( *edn, username );
 473
 474                                 if( realm && *realm ) {
 475                                         strcat( *edn, " + realm=" );
 476                                         strcat( *edn, realm );
 477                                 }
 478
 479                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: authzdn: \"%s\"\n",
 480                                         *edn, 0, 0);
 481                         }
 482
 483                         send_ldap_sasl( conn, op, rc = LDAP_SUCCESS,
 484                                 NULL, NULL, NULL, NULL, &response );
 485                 }
 486
 487         } else if ( sc == SASL_CONTINUE ) {
 488                 send_ldap_sasl( conn, op, rc = LDAP_SASL_BIND_IN_PROGRESS,
 489                         NULL, NULL, NULL, NULL,  &response );
 490
 491         } else {
 492                 send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
 493                         NULL, errstr, NULL, NULL );
 494         }
 495
 496         Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: rc=%d\n", rc, 0, 0);
 497
 498 #else
 499         send_ldap_result( conn, op, rc = LDAP_UNAVAILABLE,
 500                 NULL, "SASL not supported", NULL, NULL );
 501 #endif
 502
 503         return rc;
 504 }
 505
 506 char* slap_sasl_secprops( const char *in )
 507 {
 508 #ifdef HAVE_CYRUS_SASL
 509         int rc = ldap_pvt_sasl_secprops( in, &sasl_secprops );
 510
 511         return rc == LDAP_SUCCESS ? NULL : "Invalid security properties";
 512 #else
 513         return "SASL not supported";
 514 #endif
 515 }
 516