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
  71 static int
  72 slap_sasl_err2ldap( int saslerr )
  73 {
  74         int rc;
  75
  76         switch (saslerr) {
  77                 case SASL_CONTINUE:
  78                         rc = LDAP_SASL_BIND_IN_PROGRESS;
  79                         break;
  80                 case SASL_FAIL:
  81                         rc = LDAP_OTHER;
  82                         break;
  83                 case SASL_NOMEM:
  84                         rc = LDAP_OTHER;
  85                         break;
  86                 case SASL_NOMECH:
  87                         rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
  88                         break;
  89                 case SASL_BADAUTH:
  90                         rc = LDAP_INVALID_CREDENTIALS;
  91                         break;
  92                 case SASL_NOAUTHZ:
  93                         rc = LDAP_INSUFFICIENT_ACCESS;
  94                         break;
  95                 case SASL_TOOWEAK:
  96                 case SASL_ENCRYPT:
  97                         rc = LDAP_INAPPROPRIATE_AUTH;
  98                         break;
  99                 default:
 100                         rc = LDAP_OTHER;
 101                         break;
 102         }
 103
 104         return rc;
 105 }
 106 #endif
 107
 108
 109 int slap_sasl_init( void )
 110 {
 111 #ifdef HAVE_CYRUS_SASL
 112         int rc;
 113         sasl_conn_t *server = NULL;
 114         sasl_callback_t server_callbacks[] = {
 115                 { SASL_CB_LOG, &sasl_cb_log, NULL },
 116                 { SASL_CB_LIST_END, NULL, NULL }
 117         };
 118
 119         sasl_set_alloc(
 120                 ch_malloc,
 121                 ch_calloc,
 122                 ch_realloc,
 123                 ch_free );
 124
 125         sasl_set_mutex(
 126                 ldap_pvt_sasl_mutex_new,
 127                 ldap_pvt_sasl_mutex_lock,
 128                 ldap_pvt_sasl_mutex_unlock,
 129                 ldap_pvt_sasl_mutex_dispose );
 130
 131         /* should provide callbacks for logging */
 132         /* server name should be configurable */
 133         rc = sasl_server_init( server_callbacks, "slapd" );
 134
 135         if( rc != SASL_OK ) {
 136                 Debug( LDAP_DEBUG_ANY, "sasl_server_init failed\n",
 137                         0, 0, 0 );
 138                 return -1;
 139         }
 140
 141         if( sasl_host == NULL ) {
 142                 static char hostname[MAXHOSTNAMELEN+1];
 143
 144                 if( gethostname( hostname, MAXHOSTNAMELEN ) == 0 ) {
 145                         hostname[MAXHOSTNAMELEN] = '\0';
 146                         sasl_host = hostname;
 147                 }
 148         }
 149
 150         Debug( LDAP_DEBUG_TRACE,
 151                 "slap_sasl_init: %s initialized!\n",
 152                 sasl_host, 0, 0 );
 153
 154         /* default security properties */
 155         memset( &sasl_secprops, '\0', sizeof(sasl_secprops) );
 156     sasl_secprops.max_ssf = UINT_MAX;
 157     sasl_secprops.maxbufsize = 65536;
 158     sasl_secprops.security_flags = SASL_SEC_NOPLAINTEXT|SASL_SEC_NOANONYMOUS;
 159
 160 #ifdef SLAPD_SPASSWD
 161         lutil_passwd_sasl_conn = server;
 162 #else
 163         sasl_dispose( &server );
 164 #endif
 165
 166 #endif
 167         return 0;
 168 }
 169
 170 int slap_sasl_destroy( void )
 171 {
 172 #ifdef HAVE_CYRUS_SASL
 173 #ifdef SLAPD_SPASSWD
 174         sasl_dispose( &lutil_passwd_sasl_conn );
 175 #endif
 176         sasl_done();
 177 #endif
 178         return 0;
 179 }
 180
 181 int slap_sasl_open( Connection *conn )
 182 {
 183         int sc = LDAP_SUCCESS;
 184
 185 #ifdef HAVE_CYRUS_SASL
 186         sasl_conn_t *ctx = NULL;
 187         sasl_callback_t session_callbacks[] = {
 188                 { SASL_CB_LOG, &sasl_cb_log, conn },
 189                 { SASL_CB_LIST_END, NULL, NULL }
 190         };
 191
 192         /* create new SASL context */
 193         sc = sasl_server_new( "ldap", sasl_host, global_realm,
 194                 session_callbacks,
 195 #ifdef LDAP_SASL_SECURITY_LAYER
 196                 SASL_SECURITY_LAYER,
 197 #else
 198                 0,
 199 #endif
 200                 &ctx );
 201
 202
 203         if( sc != SASL_OK ) {
 204                 Debug( LDAP_DEBUG_ANY, "sasl_server_new failed: %d\n",
 205                         sc, 0, 0 );
 206                 return -1;
 207         }
 208
 209         conn->c_sasl_context = ctx;
 210
 211         if( sc == SASL_OK ) {
 212                 sc = sasl_setprop( ctx,
 213                         SASL_SEC_PROPS, &sasl_secprops );
 214
 215                 if( sc != SASL_OK ) {
 216                         Debug( LDAP_DEBUG_ANY, "sasl_setprop failed: %d\n",
 217                                 sc, 0, 0 );
 218                         slap_sasl_close( conn );
 219                         return -1;
 220                 }
 221         }
 222
 223         sc = slap_sasl_err2ldap( sc );
 224 #endif
 225         return sc;
 226 }
 227
 228 int slap_sasl_external(
 229         Connection *conn,
 230         unsigned ssf,
 231         char *auth_id )
 232 {
 233 #ifdef HAVE_CYRUS_SASL
 234         int sc;
 235         sasl_conn_t *ctx = conn->c_sasl_context;
 236         sasl_external_properties_t extprops;
 237
 238         if ( ctx == NULL ) {
 239                 return LDAP_UNAVAILABLE;
 240         }
 241
 242         memset( &extprops, 0L, sizeof(extprops) );
 243         extprops.ssf = ssf;
 244         extprops.auth_id = auth_id;
 245
 246         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
 247                 (void *) &extprops );
 248
 249         if ( sc != SASL_OK ) {
 250                 return LDAP_OTHER;
 251         }
 252 #endif
 253
 254         return LDAP_SUCCESS;
 255 }
 256
 257 int slap_sasl_reset( Connection *conn )
 258 {
 259 #ifdef HAVE_CYRUS_SASL
 260         sasl_conn_t *ctx = conn->c_sasl_context;
 261
 262         if( ctx != NULL ) {
 263         }
 264 #endif
 265         /* must return "anonymous" */
 266         return LDAP_SUCCESS;
 267 }
 268
 269 char ** slap_sasl_mechs( Connection *conn )
 270 {
 271         char **mechs = NULL;
 272
 273 #ifdef HAVE_CYRUS_SASL
 274         sasl_conn_t *ctx = conn->c_sasl_context;
 275
 276         if( ctx != NULL ) {
 277                 int sc;
 278                 char *mechstr;
 279
 280                 sc = sasl_listmech( ctx,
 281                         NULL, NULL, ",", NULL,
 282                         &mechstr, NULL, NULL );
 283
 284                 if( sc != SASL_OK ) {
 285                         Debug( LDAP_DEBUG_ANY, "slap_sasl_listmech failed: %d\n",
 286                                 sc, 0, 0 );
 287                         return NULL;
 288                 }
 289
 290                 mechs = str2charray( mechstr, "," );
 291
 292                 ch_free( mechstr );
 293         }
 294 #endif
 295
 296         return mechs;
 297 }
 298
 299 int slap_sasl_close( Connection *conn )
 300 {
 301 #ifdef HAVE_CYRUS_SASL
 302         sasl_conn_t *ctx = conn->c_sasl_context;
 303
 304         if( ctx != NULL ) {
 305                 sasl_dispose( &ctx );
 306         }
 307
 308         conn->c_sasl_context = NULL;
 309 #endif
 310         return LDAP_SUCCESS;
 311 }
 312
 313 int slap_sasl_bind(
 314     Connection          *conn,
 315     Operation           *op,
 316     const char          *dn,
 317     const char          *ndn,
 318     const char          *mech,
 319     struct berval       *cred,
 320         char                            **edn )
 321 {
 322         int rc = 1;
 323
 324 #ifdef HAVE_CYRUS_SASL
 325         sasl_conn_t *ctx = conn->c_sasl_context;
 326         struct berval response;
 327         unsigned reslen;
 328         const char *errstr;
 329         int sc;
 330
 331         Debug(LDAP_DEBUG_ARGS,
 332                 "==> sasl_bind: dn=\"%s\" mech=%s cred->bv_len=%d\n",
 333                 dn, mech, cred ? cred->bv_len : 0 );
 334
 335         if( ctx == NULL ) {
 336                 send_ldap_result( conn, op, LDAP_UNAVAILABLE,
 337                         NULL, "SASL unavailable on this session", NULL, NULL );
 338                 return rc;
 339         }
 340
 341         if ( mech != NULL ) {
 342                 sc = sasl_server_start( ctx,
 343                         mech,
 344                         cred->bv_val, cred->bv_len,
 345                         (char **)&response.bv_val, &reslen, &errstr );
 346
 347         } else {
 348                 sc = sasl_server_step( ctx,
 349                         cred->bv_val, cred->bv_len,
 350                         (char **)&response.bv_val, &reslen, &errstr );
 351         }
 352
 353         response.bv_len = reslen;
 354
 355         if ( sc == SASL_OK ) {
 356                 char *username = NULL;
 357
 358                 sc = sasl_getprop( ctx,
 359                         SASL_USERNAME, (void **)&username );
 360
 361                 if ( sc != SASL_OK ) {
 362                         Debug(LDAP_DEBUG_TRACE,
 363                                 "slap_sasl_bind: getprop(USERNAME) failed!\n",
 364                                 0, 0, 0);
 365
 366                         send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
 367                                 NULL, "no SASL username", NULL, NULL );
 368
 369                 } else if ( username == NULL || *username == '\0' ) {
 370                         Debug(LDAP_DEBUG_TRACE,
 371                                 "slap_sasl_bind: getprop(USERNAME) returned NULL!\n",
 372                                 0, 0, 0);
 373
 374                         send_ldap_result( conn, op, rc = LDAP_INSUFFICIENT_ACCESS,
 375                                 NULL, "no SASL username", NULL, NULL );
 376
 377                 } else {
 378                         char *realm = NULL;
 379                         sasl_ssf_t ssf = 0;
 380
 381                         (void) sasl_getprop( ctx,
 382                                 SASL_REALM, (void **)&realm );
 383
 384                         (void) sasl_getprop( ctx,
 385                                 SASL_SSF, (void *)&ssf );
 386
 387                         Debug(LDAP_DEBUG_TRACE,
 388                                 "slap_sasl_bind: username=\"%s\" realm=\"%s\" ssf=%lu\n",
 389                                 username ? username : "",
 390                                 realm ? realm : "",
 391                                 (unsigned long) ssf );
 392
 393                         if( !strncasecmp( username, "anonymous", sizeof("anonyous")-1 ) &&
 394                                 ( ( username[sizeof("anonymous")] == '\0' ) ||
 395                                   ( username[sizeof("anonymous")] == '@' ) ) )
 396                         {
 397                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: anonymous\n",
 398                                         0, 0, 0);
 399
 400                         } else {
 401                                 *edn = ch_malloc( sizeof( "uid= + realm=" )
 402                                         + ( username ? strlen( username ) : 0 )
 403                                         + ( realm ? strlen( realm ) : 0 ) );
 404
 405                                 strcpy( *edn, "uid=" );
 406                                 strcat( *edn, username );
 407
 408                                 if( realm && *realm ) {
 409                                         strcat( *edn, " + realm=" );
 410                                         strcat( *edn, realm );
 411                                 }
 412
 413                                 Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: authzdn: \"%s\"\n",
 414                                         *edn, 0, 0);
 415                         }
 416
 417                         send_ldap_sasl( conn, op, rc = LDAP_SUCCESS,
 418                                 NULL, NULL, NULL, NULL, &response );
 419                 }
 420
 421         } else if ( sc == SASL_CONTINUE ) {
 422                 send_ldap_sasl( conn, op, rc = LDAP_SASL_BIND_IN_PROGRESS,
 423                         NULL, NULL, NULL, NULL,  &response );
 424
 425         } else {
 426                 send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
 427                         NULL, errstr, NULL, NULL );
 428         }
 429
 430         Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: rc=%d\n", rc, 0, 0);
 431
 432 #else
 433         send_ldap_result( conn, op, rc = LDAP_UNAVAILABLE,
 434                 NULL, "SASL not supported", NULL, NULL );
 435 #endif
 436
 437         return rc;
 438 }
 439
 440 char* slap_sasl_secprops( const char *in )
 441 {
 442 #ifdef HAVE_CYRUS_SASL
 443         int rc = ldap_pvt_sasl_secprops( in, &sasl_secprops );
 444
 445         return rc == LDAP_SUCCESS ? NULL : "Invalid security properties";
 446 #else
 447         return "SASL not supported";
 448 #endif
 449 }
 450