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         session_callbacks =
 250                 ch_calloc( 3, sizeof(sasl_callback_t));
 251         conn->c_sasl_extra = session_callbacks;
 252
 253         session_callbacks[0].id = SASL_CB_LOG;
 254         session_callbacks[0].proc = &slap_sasl_log;
 255         session_callbacks[0].context = conn;
 256
 257         session_callbacks[1].id = SASL_CB_PROXY_POLICY;
 258         session_callbacks[1].proc = &slap_sasl_authorize;
 259         session_callbacks[1].context = conn;
 260
 261         session_callbacks[2].id = SASL_CB_LIST_END;
 262         session_callbacks[2].proc = NULL;
 263         session_callbacks[2].context = NULL;
 264
 265         /* create new SASL context */
 266         sc = sasl_server_new( "ldap", sasl_host, global_realm,
 267                 session_callbacks,
 268 #ifdef LDAP_SASL_SECURITY_LAYER
 269                 SASL_SECURITY_LAYER,
 270 #else
 271                 0,
 272 #endif
 273                 &ctx );
 274
 275
 276         if( sc != SASL_OK ) {
 277                 Debug( LDAP_DEBUG_ANY, "sasl_server_new failed: %d\n",
 278                         sc, 0, 0 );
 279                 return -1;
 280         }
 281
 282         conn->c_sasl_context = ctx;
 283
 284         if( sc == SASL_OK ) {
 285                 sc = sasl_setprop( ctx,
 286                         SASL_SEC_PROPS, &sasl_secprops );
 287
 288                 if( sc != SASL_OK ) {
 289                         Debug( LDAP_DEBUG_ANY, "sasl_setprop failed: %d\n",
 290                                 sc, 0, 0 );
 291                         slap_sasl_close( conn );
 292                         return -1;
 293                 }
 294         }
 295
 296         sc = slap_sasl_err2ldap( sc );
 297 #endif
 298         return sc;
 299 }
 300
 301 int slap_sasl_external(
 302         Connection *conn,
 303         unsigned ssf,
 304         char *auth_id )
 305 {
 306 #ifdef HAVE_CYRUS_SASL
 307         int sc;
 308         sasl_conn_t *ctx = conn->c_sasl_context;
 309         sasl_external_properties_t extprops;
 310
 311         if ( ctx == NULL ) {
 312                 return LDAP_UNAVAILABLE;
 313         }
 314
 315         memset( &extprops, 0L, sizeof(extprops) );
 316         extprops.ssf = ssf;
 317         extprops.auth_id = auth_id;
 318
 319         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
 320                 (void *) &extprops );
 321
 322         if ( sc != SASL_OK ) {
 323                 return LDAP_OTHER;
 324         }
 325 #endif
 326
 327         return LDAP_SUCCESS;
 328 }
 329
 330 int slap_sasl_reset( Connection *conn )
 331 {
 332 #ifdef HAVE_CYRUS_SASL
 333         sasl_conn_t *ctx = conn->c_sasl_context;
 334
 335         if( ctx != NULL ) {
 336         }
 337 #endif
 338         /* must return "anonymous" */
 339         return LDAP_SUCCESS;
 340 }
 341
 342 char ** slap_sasl_mechs( Connection *conn )
 343 {
 344         char **mechs = NULL;
 345
 346 #ifdef HAVE_CYRUS_SASL
 347         sasl_conn_t *ctx = conn->c_sasl_context;
 348
 349         if( ctx != NULL ) {
 350                 int sc;
 351                 char *mechstr;
 352
 353                 sc = sasl_listmech( ctx,
 354                         NULL, NULL, ",", NULL,
 355                         &mechstr, NULL, NULL );
 356
 357                 if( sc != SASL_OK ) {
 358                         Debug( LDAP_DEBUG_ANY, "slap_sasl_listmech failed: %d\n",
 359                                 sc, 0, 0 );
 360                         return NULL;
 361                 }
 362
 363                 mechs = str2charray( mechstr, "," );
 364
 365                 ch_free( mechstr );
 366         }
 367 #endif
 368
 369         return mechs;
 370 }
 371
 372 int slap_sasl_close( Connection *conn )
 373 {
 374 #ifdef HAVE_CYRUS_SASL
 375         sasl_conn_t *ctx = conn->c_sasl_context;
 376
 377         if( ctx != NULL ) {
 378                 sasl_dispose( &ctx );
 379         }
 380
 381         conn->c_sasl_context = NULL;
 382
 383         free( conn->c_sasl_extra );
 384         conn->c_sasl_extra = NULL;
 385 #endif
 386
 387         return LDAP_SUCCESS;
 388 }
 389
 390 int slap_sasl_bind(
 391     Connection          *conn,
 392     Operation           *op,
 393     const char          *dn,
 394     const char          *ndn,
 395     const char          *mech,
 396     struct berval       *cred,
 397         char                            **edn )
 398 {
 399         int rc = 1;
 400
 401 #ifdef HAVE_CYRUS_SASL
 402         sasl_conn_t *ctx = conn->c_sasl_context;
 403         struct berval response;
 404         unsigned reslen;
 405         const char *errstr;
 406         int sc;
 407
 408         Debug(LDAP_DEBUG_ARGS,
 409                 "==> sasl_bind: dn=\"%s\" mech=%s cred->bv_len=%d\n",
 410                 dn, mech ? mech : "<continuing>", cred ? cred->bv_len : 0 );
 411
 412         if( ctx == NULL ) {
 413                 send_ldap_result( conn, op, LDAP_UNAVAILABLE,
 414                         NULL, "SASL unavailable on this session", NULL, NULL );
 415                 return rc;
 416         }
 417
 418         if ( mech != NULL ) {
 419                 sc = sasl_server_start( ctx,
 420                         mech,
 421                         cred->bv_val, cred->bv_len,
 422                         (char **)&response.bv_val, &reslen, &errstr );
 423
 424         } else {
 425                 sc = sasl_server_step( ctx,
 426                         cred->bv_val, cred->bv_len,
 427                         (char **)&response.bv_val, &reslen, &errstr );
 428         }
 429
 430         response.bv_len = reslen;
 431
 432         if ( sc == SASL_OK ) {
 433                 char *username = NULL;
 434
 435                 sc = sasl_getprop( ctx,
 436                         SASL_USERNAME, (void **)&username );
 437
 438                 if ( sc != SASL_OK ) {
 439                         Debug(LDAP_DEBUG_TRACE,
 440                                 "slap_sasl_bind: getprop(USERNAME) failed!\n",
 441                                 0, 0, 0);
 442
 443                         send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
 444                                 NULL, "no SASL username", NULL, NULL );
 445
 446                 } else if ( username == NULL || *username == '\0' ) {
 447                         Debug(LDAP_DEBUG_TRACE,
 448                                 "slap_sasl_bind: getprop(USERNAME) returned NULL!\n",
 449                                 0, 0, 0);
 450
 451                         send_ldap_result( conn, op, rc = LDAP_INSUFFICIENT_ACCESS,
 452                                 NULL, "no SASL username", NULL, NULL );
 453
 454                 } else {
 455                         char *realm = NULL;
 456                         sasl_ssf_t *ssf = NULL;
 457
 458                         (void) sasl_getprop( ctx,
 459                                 SASL_REALM, (void **)&realm );
 460
 461                         (void) sasl_getprop( ctx,
 462                                 SASL_SSF, (void *)&ssf );
 463
 464                         Debug(LDAP_DEBUG_TRACE,
 465                                 "slap_sasl_bind: username=\"%s\" realm=\"%s\" ssf=%lu\n",
 466                                 username ? username : "",
 467                                 realm ? realm : "",
 468                                 (unsigned long) ( ssf ? *ssf : 0 ) );
 469
 470
 471                         rc = LDAP_SUCCESS;
 472
 473                         if( username == NULL || (
 474                                 !strncasecmp( username, "anonymous", sizeof("anonyous")-1 ) &&
 475                                 ( ( username[sizeof("anonymous")] == '\0' ) ||
 476                                   ( username[sizeof("anonymous")] == '@' ) ) ) )
 477                         {
 478                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: anonymous\n",
 479                                         0, 0, 0);
 480
 481                         } else if ( username[0] == 'u' && username[1] == ':'
 482                                 && username[2] != '\0'
 483                                 && strpbrk( &username[2], "=,;\"\\") == NULL )
 484                         {
 485                                 *edn = ch_malloc( sizeof( "uid= + realm=" )
 486                                         + strlen( &username[2] )
 487                                         + ( realm ? strlen( realm ) : 0 ) );
 488
 489                                 strcpy( *edn, "uid=" );
 490                                 strcat( *edn, &username[2] );
 491
 492                                 if( realm && *realm ) {
 493                                         strcat( *edn, " + realm=" );
 494                                         strcat( *edn, realm );
 495                                 }
 496
 497                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: authzdn: \"%s\"\n",
 498                                         *edn, 0, 0);
 499
 500                         } else {
 501                                 rc = LDAP_INAPPROPRIATE_AUTH;
 502                                 errstr = "authorization disallowed";
 503                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: %s\n",
 504                                         errstr, 0, 0);
 505                         }
 506
 507                         if( rc == LDAP_SUCCESS ) {
 508                                 send_ldap_sasl( conn, op, rc,
 509                                         NULL, NULL, NULL, NULL,
 510                                         response.bv_len ? &response : NULL );
 511
 512                         } else {
 513                                 send_ldap_result( conn, op, rc,
 514                                         NULL, errstr, NULL, NULL );
 515                         }
 516                 }
 517
 518         } else if ( sc == SASL_CONTINUE ) {
 519                 send_ldap_sasl( conn, op, rc = LDAP_SASL_BIND_IN_PROGRESS,
 520                         NULL, NULL, NULL, NULL,  &response );
 521
 522         } else {
 523                 send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
 524                         NULL, errstr, NULL, NULL );
 525         }
 526
 527         Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: rc=%d\n", rc, 0, 0);
 528
 529 #else
 530         send_ldap_result( conn, op, rc = LDAP_UNAVAILABLE,
 531                 NULL, "SASL not supported", NULL, NULL );
 532 #endif
 533
 534         return rc;
 535 }
 536
 537 char* slap_sasl_secprops( const char *in )
 538 {
 539 #ifdef HAVE_CYRUS_SASL
 540         int rc = ldap_pvt_sasl_secprops( in, &sasl_secprops );
 541
 542         return rc == LDAP_SUCCESS ? NULL : "Invalid security properties";
 543 #else
 544         return "SASL not supported";
 545 #endif
 546 }
 547