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