git.sur5r.net Git - openldap/blob - libraries/libldap/gssapi.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2018 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Author: Stefan Metzmacher <metze@sernet.de>
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17
  18 #include "portable.h"
  19
  20 #include <stdio.h>
  21
  22 #include <ac/socket.h>
  23 #include <ac/stdlib.h>
  24 #include <ac/string.h>
  25 #include <ac/time.h>
  26 #include <ac/errno.h>
  27 #include <ac/ctype.h>
  28 #include <ac/unistd.h>
  29
  30 #ifdef HAVE_LIMITS_H
  31 #include <limits.h>
  32 #endif
  33
  34 #include "ldap-int.h"
  35
  36 #ifdef HAVE_GSSAPI
  37
  38 #ifdef HAVE_GSSAPI_GSSAPI_H
  39 #include <gssapi/gssapi.h>
  40 #else
  41 #include <gssapi.h>
  42 #endif
  43
  44 static char *
  45 gsserrstr(
  46         char *buf,
  47         ber_len_t buf_len,
  48         gss_OID mech,
  49         int gss_rc,
  50         OM_uint32 minor_status )
  51 {
  52         OM_uint32 min2;
  53         gss_buffer_desc mech_msg = GSS_C_EMPTY_BUFFER;
  54         gss_buffer_desc gss_msg = GSS_C_EMPTY_BUFFER;
  55         gss_buffer_desc minor_msg = GSS_C_EMPTY_BUFFER;
  56         OM_uint32 msg_ctx = 0;
  57
  58         if (buf == NULL) {
  59                 return NULL;
  60         }
  61
  62         if (buf_len == 0) {
  63                 return NULL;
  64         }
  65
  66 #ifdef HAVE_GSS_OID_TO_STR
  67         gss_oid_to_str(&min2, mech, &mech_msg);
  68 #endif
  69         gss_display_status(&min2, gss_rc, GSS_C_GSS_CODE,
  70                            mech, &msg_ctx, &gss_msg);
  71         gss_display_status(&min2, minor_status, GSS_C_MECH_CODE,
  72                            mech, &msg_ctx, &minor_msg);
  73
  74         snprintf(buf, buf_len, "gss_rc[%d:%*s] mech[%*s] minor[%u:%*s]",
  75                  gss_rc, (int)gss_msg.length,
  76                  (const char *)(gss_msg.value?gss_msg.value:""),
  77                  (int)mech_msg.length,
  78                  (const char *)(mech_msg.value?mech_msg.value:""),
  79                  minor_status, (int)minor_msg.length,
  80                  (const char *)(minor_msg.value?minor_msg.value:""));
  81
  82         gss_release_buffer(&min2, &mech_msg);
  83         gss_release_buffer(&min2, &gss_msg);
  84         gss_release_buffer(&min2, &minor_msg);
  85
  86         buf[buf_len-1] = '\0';
  87
  88         return buf;
  89 }
  90
  91 static void
  92 sb_sasl_gssapi_init(
  93         struct sb_sasl_generic_data *p,
  94         ber_len_t *min_send,
  95         ber_len_t *max_send,
  96         ber_len_t *max_recv )
  97 {
  98         gss_ctx_id_t gss_ctx = (gss_ctx_id_t)p->ops_private;
  99         int gss_rc;
 100         OM_uint32 minor_status;
 101         gss_OID ctx_mech = GSS_C_NO_OID;
 102         OM_uint32 ctx_flags = 0;
 103         int conf_req_flag = 0;
 104         OM_uint32 max_input_size;
 105
 106         gss_inquire_context(&minor_status,
 107                             gss_ctx,
 108                             NULL,
 109                             NULL,
 110                             NULL,
 111                             &ctx_mech,
 112                             &ctx_flags,
 113                             NULL,
 114                             NULL);
 115
 116         if (ctx_flags & (GSS_C_CONF_FLAG)) {
 117                 conf_req_flag = 1;
 118         }
 119
 120 #if defined(HAVE_CYRUS_SASL)
 121 #define SEND_PREALLOC_SIZE      SASL_MIN_BUFF_SIZE
 122 #else
 123 #define SEND_PREALLOC_SIZE      4096
 124 #endif
 125 #define SEND_MAX_WIRE_SIZE      0x00A00000
 126 #define RECV_MAX_WIRE_SIZE      0x0FFFFFFF
 127 #define FALLBACK_SEND_MAX_SIZE  0x009FFFB8 /* from MIT 1.5.x */
 128
 129         gss_rc = gss_wrap_size_limit(&minor_status, gss_ctx,
 130                                      conf_req_flag, GSS_C_QOP_DEFAULT,
 131                                      SEND_MAX_WIRE_SIZE, &max_input_size);
 132         if ( gss_rc != GSS_S_COMPLETE ) {
 133                 char msg[256];
 134                 ber_log_printf( LDAP_DEBUG_ANY, p->sbiod->sbiod_sb->sb_debug,
 135                                 "sb_sasl_gssapi_init: failed to wrap size limit: %s\n",
 136                                 gsserrstr( msg, sizeof(msg), ctx_mech, gss_rc, minor_status ) );
 137                 ber_log_printf( LDAP_DEBUG_ANY, p->sbiod->sbiod_sb->sb_debug,
 138                                 "sb_sasl_gssapi_init: fallback to default wrap size limit\n");
 139                 /*
 140                  * some libgssglue/libgssapi versions
 141                  * have a broken gss_wrap_size_limit()
 142                  * implementation
 143                  */
 144                 max_input_size = FALLBACK_SEND_MAX_SIZE;
 145         }
 146
 147         *min_send = SEND_PREALLOC_SIZE;
 148         *max_send = max_input_size;
 149         *max_recv = RECV_MAX_WIRE_SIZE;
 150 }
 151
 152 static ber_int_t
 153 sb_sasl_gssapi_encode(
 154         struct sb_sasl_generic_data *p,
 155         unsigned char *buf,
 156         ber_len_t len,
 157         Sockbuf_Buf *dst )
 158 {
 159         gss_ctx_id_t gss_ctx = (gss_ctx_id_t)p->ops_private;
 160         int gss_rc;
 161         OM_uint32 minor_status;
 162         gss_buffer_desc unwrapped, wrapped;
 163         gss_OID ctx_mech = GSS_C_NO_OID;
 164         OM_uint32 ctx_flags = 0;
 165         int conf_req_flag = 0;
 166         int conf_state;
 167         unsigned char *b;
 168         ber_len_t pkt_len;
 169
 170         unwrapped.value         = buf;
 171         unwrapped.length        = len;
 172
 173         gss_inquire_context(&minor_status,
 174                             gss_ctx,
 175                             NULL,
 176                             NULL,
 177                             NULL,
 178                             &ctx_mech,
 179                             &ctx_flags,
 180                             NULL,
 181                             NULL);
 182
 183         if (ctx_flags & (GSS_C_CONF_FLAG)) {
 184                 conf_req_flag = 1;
 185         }
 186
 187         gss_rc = gss_wrap(&minor_status, gss_ctx,
 188                           conf_req_flag, GSS_C_QOP_DEFAULT,
 189                           &unwrapped, &conf_state,
 190                           &wrapped);
 191         if ( gss_rc != GSS_S_COMPLETE ) {
 192                 char msg[256];
 193                 ber_log_printf( LDAP_DEBUG_ANY, p->sbiod->sbiod_sb->sb_debug,
 194                                 "sb_sasl_gssapi_encode: failed to encode packet: %s\n",
 195                                 gsserrstr( msg, sizeof(msg), ctx_mech, gss_rc, minor_status ) );
 196                 return -1;
 197         }
 198
 199         if ( conf_req_flag && conf_state == 0 ) {
 200                 ber_log_printf( LDAP_DEBUG_ANY, p->sbiod->sbiod_sb->sb_debug,
 201                                 "sb_sasl_gssapi_encode: GSS_C_CONF_FLAG was ignored by our gss_wrap()\n" );
 202                 return -1;
 203         }
 204
 205         pkt_len = 4 + wrapped.length;
 206
 207         /* Grow the packet buffer if necessary */
 208         if ( dst->buf_size < pkt_len &&
 209                 ber_pvt_sb_grow_buffer( dst, pkt_len ) < 0 )
 210         {
 211                 ber_log_printf( LDAP_DEBUG_ANY, p->sbiod->sbiod_sb->sb_debug,
 212                                 "sb_sasl_gssapi_encode: failed to grow the buffer to %lu bytes\n",
 213                                 pkt_len );
 214                 return -1;
 215         }
 216
 217         dst->buf_end = pkt_len;
 218
 219         b = (unsigned char *)dst->buf_base;
 220
 221         b[0] = (unsigned char)(wrapped.length >> 24);
 222         b[1] = (unsigned char)(wrapped.length >> 16);
 223         b[2] = (unsigned char)(wrapped.length >>  8);
 224         b[3] = (unsigned char)(wrapped.length >>  0);
 225
 226         /* copy the wrapped blob to the right location */
 227         memcpy(b + 4, wrapped.value, wrapped.length);
 228
 229         gss_release_buffer(&minor_status, &wrapped);
 230
 231         return 0;
 232 }
 233
 234 static ber_int_t
 235 sb_sasl_gssapi_decode(
 236         struct sb_sasl_generic_data *p,
 237         const Sockbuf_Buf *src,
 238         Sockbuf_Buf *dst )
 239 {
 240         gss_ctx_id_t gss_ctx = (gss_ctx_id_t)p->ops_private;
 241         int gss_rc;
 242         OM_uint32 minor_status;
 243         gss_buffer_desc unwrapped, wrapped;
 244         gss_OID ctx_mech = GSS_C_NO_OID;
 245         OM_uint32 ctx_flags = 0;
 246         int conf_req_flag = 0;
 247         int conf_state;
 248         unsigned char *b;
 249
 250         wrapped.value   = src->buf_base + 4;
 251         wrapped.length  = src->buf_end - 4;
 252
 253         gss_inquire_context(&minor_status,
 254                             gss_ctx,
 255                             NULL,
 256                             NULL,
 257                             NULL,
 258                             &ctx_mech,
 259                             &ctx_flags,
 260                             NULL,
 261                             NULL);
 262
 263         if (ctx_flags & (GSS_C_CONF_FLAG)) {
 264                 conf_req_flag = 1;
 265         }
 266
 267         gss_rc = gss_unwrap(&minor_status, gss_ctx,
 268                             &wrapped, &unwrapped,
 269                             &conf_state, GSS_C_QOP_DEFAULT);
 270         if ( gss_rc != GSS_S_COMPLETE ) {
 271                 char msg[256];
 272                 ber_log_printf( LDAP_DEBUG_ANY, p->sbiod->sbiod_sb->sb_debug,
 273                                 "sb_sasl_gssapi_decode: failed to decode packet: %s\n",
 274                                 gsserrstr( msg, sizeof(msg), ctx_mech, gss_rc, minor_status ) );
 275                 return -1;
 276         }
 277
 278         if ( conf_req_flag && conf_state == 0 ) {
 279                 ber_log_printf( LDAP_DEBUG_ANY, p->sbiod->sbiod_sb->sb_debug,
 280                                 "sb_sasl_gssapi_encode: GSS_C_CONF_FLAG was ignored by our peer\n" );
 281                 return -1;
 282         }
 283
 284         /* Grow the packet buffer if necessary */
 285         if ( dst->buf_size < unwrapped.length &&
 286                 ber_pvt_sb_grow_buffer( dst, unwrapped.length ) < 0 )
 287         {
 288                 ber_log_printf( LDAP_DEBUG_ANY, p->sbiod->sbiod_sb->sb_debug,
 289                                 "sb_sasl_gssapi_decode: failed to grow the buffer to %lu bytes\n",
 290                                 unwrapped.length );
 291                 return -1;
 292         }
 293
 294         dst->buf_end = unwrapped.length;
 295
 296         b = (unsigned char *)dst->buf_base;
 297
 298         /* copy the wrapped blob to the right location */
 299         memcpy(b, unwrapped.value, unwrapped.length);
 300
 301         gss_release_buffer(&minor_status, &unwrapped);
 302
 303         return 0;
 304 }
 305
 306 static void
 307 sb_sasl_gssapi_reset_buf(
 308         struct sb_sasl_generic_data *p,
 309         Sockbuf_Buf *buf )
 310 {
 311         ber_pvt_sb_buf_destroy( buf );
 312 }
 313
 314 static void
 315 sb_sasl_gssapi_fini( struct sb_sasl_generic_data *p )
 316 {
 317 }
 318
 319 static const struct sb_sasl_generic_ops sb_sasl_gssapi_ops = {
 320         sb_sasl_gssapi_init,
 321         sb_sasl_gssapi_encode,
 322         sb_sasl_gssapi_decode,
 323         sb_sasl_gssapi_reset_buf,
 324         sb_sasl_gssapi_fini
 325 };
 326
 327 static int
 328 sb_sasl_gssapi_install(
 329         Sockbuf *sb,
 330         gss_ctx_id_t gss_ctx )
 331 {
 332         struct sb_sasl_generic_install install_arg;
 333
 334         install_arg.ops         = &sb_sasl_gssapi_ops;
 335         install_arg.ops_private = gss_ctx;
 336
 337         return ldap_pvt_sasl_generic_install( sb, &install_arg );
 338 }
 339
 340 static void
 341 sb_sasl_gssapi_remove( Sockbuf *sb )
 342 {
 343         ldap_pvt_sasl_generic_remove( sb );
 344 }
 345
 346 static int
 347 map_gsserr2ldap(
 348         LDAP *ld,
 349         gss_OID mech,
 350         int gss_rc,
 351         OM_uint32 minor_status )
 352 {
 353         char msg[256];
 354
 355         Debug( LDAP_DEBUG_ANY, "%s\n",
 356                gsserrstr( msg, sizeof(msg), mech, gss_rc, minor_status ),
 357                NULL, NULL );
 358
 359         if (gss_rc == GSS_S_COMPLETE) {
 360                 ld->ld_errno = LDAP_SUCCESS;
 361         } else if (GSS_CALLING_ERROR(gss_rc)) {
 362                 ld->ld_errno = LDAP_LOCAL_ERROR;
 363         } else if (GSS_ROUTINE_ERROR(gss_rc)) {
 364                 ld->ld_errno = LDAP_INAPPROPRIATE_AUTH;
 365         } else if (gss_rc == GSS_S_CONTINUE_NEEDED) {
 366                 ld->ld_errno = LDAP_SASL_BIND_IN_PROGRESS;
 367         } else if (GSS_SUPPLEMENTARY_INFO(gss_rc)) {
 368                 ld->ld_errno = LDAP_AUTH_UNKNOWN;
 369         } else if (GSS_ERROR(gss_rc)) {
 370                 ld->ld_errno = LDAP_AUTH_UNKNOWN;
 371         } else {
 372                 ld->ld_errno = LDAP_OTHER;
 373         }
 374
 375         return ld->ld_errno;
 376 }
 377
 378
 379 static int
 380 ldap_gssapi_get_rootdse_infos (
 381         LDAP *ld,
 382         char **pmechlist,
 383         char **pldapServiceName,
 384         char **pdnsHostName )
 385 {
 386         /* we need to query the server for supported mechs anyway */
 387         LDAPMessage *res, *e;
 388         char *attrs[] = {
 389                 "supportedSASLMechanisms",
 390                 "ldapServiceName",
 391                 "dnsHostName",
 392                 NULL
 393         };
 394         char **values, *mechlist;
 395         char *ldapServiceName = NULL;
 396         char *dnsHostName = NULL;
 397         int rc;
 398
 399         Debug( LDAP_DEBUG_TRACE, "ldap_gssapi_get_rootdse_infos\n", 0, 0, 0 );
 400
 401         rc = ldap_search_s( ld, "", LDAP_SCOPE_BASE,
 402                 NULL, attrs, 0, &res );
 403
 404         if ( rc != LDAP_SUCCESS ) {
 405                 return ld->ld_errno;
 406         }
 407
 408         e = ldap_first_entry( ld, res );
 409         if ( e == NULL ) {
 410                 ldap_msgfree( res );
 411                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 412                         ld->ld_errno = LDAP_NO_SUCH_OBJECT;
 413                 }
 414                 return ld->ld_errno;
 415         }
 416
 417         values = ldap_get_values( ld, e, "supportedSASLMechanisms" );
 418         if ( values == NULL ) {
 419                 ldap_msgfree( res );
 420                 ld->ld_errno = LDAP_NO_SUCH_ATTRIBUTE;
 421                 return ld->ld_errno;
 422         }
 423
 424         mechlist = ldap_charray2str( values, " " );
 425         if ( mechlist == NULL ) {
 426                 LDAP_VFREE( values );
 427                 ldap_msgfree( res );
 428                 ld->ld_errno = LDAP_NO_MEMORY;
 429                 return ld->ld_errno;
 430         }
 431
 432         LDAP_VFREE( values );
 433
 434         values = ldap_get_values( ld, e, "ldapServiceName" );
 435         if ( values == NULL ) {
 436                 goto get_dns_host_name;
 437         }
 438
 439         ldapServiceName = ldap_charray2str( values, " " );
 440         if ( ldapServiceName == NULL ) {
 441                 LDAP_FREE( mechlist );
 442                 LDAP_VFREE( values );
 443                 ldap_msgfree( res );
 444                 ld->ld_errno = LDAP_NO_MEMORY;
 445                 return ld->ld_errno;
 446         }
 447         LDAP_VFREE( values );
 448
 449 get_dns_host_name:
 450
 451         values = ldap_get_values( ld, e, "dnsHostName" );
 452         if ( values == NULL ) {
 453                 goto done;
 454         }
 455
 456         dnsHostName = ldap_charray2str( values, " " );
 457         if ( dnsHostName == NULL ) {
 458                 LDAP_FREE( mechlist );
 459                 LDAP_FREE( ldapServiceName );
 460                 LDAP_VFREE( values );
 461                 ldap_msgfree( res );
 462                 ld->ld_errno = LDAP_NO_MEMORY;
 463                 return ld->ld_errno;
 464         }
 465         LDAP_VFREE( values );
 466
 467 done:
 468         ldap_msgfree( res );
 469
 470         *pmechlist = mechlist;
 471         *pldapServiceName = ldapServiceName;
 472         *pdnsHostName = dnsHostName;
 473
 474         return LDAP_SUCCESS;
 475 }
 476
 477
 478 static int check_for_gss_spnego_support( LDAP *ld, const char *mechs_str )
 479 {
 480         int rc;
 481         char **mechs_list = NULL;
 482
 483         mechs_list = ldap_str2charray( mechs_str, " " );
 484         if ( mechs_list == NULL ) {
 485                 ld->ld_errno = LDAP_NO_MEMORY;
 486                 return ld->ld_errno;
 487         }
 488
 489         rc = ldap_charray_inlist( mechs_list, "GSS-SPNEGO" );
 490         ldap_charray_free( mechs_list );
 491         if ( rc != 1) {
 492                 ld->ld_errno = LDAP_STRONG_AUTH_NOT_SUPPORTED;
 493                 return ld->ld_errno;
 494         }
 495
 496         return LDAP_SUCCESS;
 497 }
 498
 499 static int
 500 guess_service_principal(
 501         LDAP *ld,
 502         const char *ldapServiceName,
 503         const char *dnsHostName,
 504         gss_name_t *principal )
 505 {
 506         gss_buffer_desc input_name;
 507         /* GSS_KRB5_NT_PRINCIPAL_NAME */
 508         gss_OID_desc nt_principal =
 509         {10, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x01"};
 510         const char *host = ld->ld_defconn->lconn_server->lud_host;
 511         OM_uint32 minor_status;
 512         int gss_rc;
 513         int ret;
 514         size_t svc_principal_size;
 515         char *svc_principal = NULL;
 516         const char *principal_fmt = NULL;
 517         const char *str = NULL;
 518         const char *givenstr = NULL;
 519         const char *ignore = "not_defined_in_RFC4178@please_ignore";
 520         int allow_remote = 0;
 521
 522         if (ldapServiceName) {
 523                 givenstr = strchr(ldapServiceName, ':');
 524                 if (givenstr && givenstr[1]) {
 525                         givenstr++;
 526                         if (strcmp(givenstr, ignore) == 0) {
 527                                 givenstr = NULL;
 528                         }
 529                 } else {
 530                         givenstr = NULL;
 531                 }
 532         }
 533
 534         if ( ld->ld_options.ldo_gssapi_options & LDAP_GSSAPI_OPT_ALLOW_REMOTE_PRINCIPAL ) {
 535                 allow_remote = 1;
 536         }
 537
 538         if (allow_remote && givenstr) {
 539                 principal_fmt = "%s";
 540                 svc_principal_size = strlen(givenstr) + 1;
 541                 str = givenstr;
 542
 543         } else if (allow_remote && dnsHostName) {
 544                 principal_fmt = "ldap/%s";
 545                 svc_principal_size = STRLENOF("ldap/") + strlen(dnsHostName) + 1;
 546                 str = dnsHostName;
 547
 548         } else {
 549                 principal_fmt = "ldap/%s";
 550                 svc_principal_size = STRLENOF("ldap/") + strlen(host) + 1;
 551                 str = host;
 552         }
 553
 554         svc_principal = (char*) ldap_memalloc(svc_principal_size * sizeof(char));
 555         if ( svc_principal == NULL ) {
 556                 ld->ld_errno = LDAP_NO_MEMORY;
 557                 return ld->ld_errno;
 558         }
 559
 560         ret = snprintf( svc_principal, svc_principal_size, principal_fmt, str );
 561         if (ret < 0 || (size_t)ret >= svc_principal_size) {
 562                 ld->ld_errno = LDAP_LOCAL_ERROR;
 563                 return ld->ld_errno;
 564         }
 565
 566         Debug( LDAP_DEBUG_TRACE, "principal for host[%s]: '%s'\n",
 567                host, svc_principal, 0 );
 568
 569         input_name.value  = svc_principal;
 570         input_name.length = (size_t)ret;
 571
 572         gss_rc = gss_import_name( &minor_status, &input_name, &nt_principal, principal );
 573         ldap_memfree( svc_principal );
 574         if ( gss_rc != GSS_S_COMPLETE ) {
 575                 return map_gsserr2ldap( ld, GSS_C_NO_OID, gss_rc, minor_status );
 576         }
 577
 578         return LDAP_SUCCESS;
 579 }
 580
 581 void ldap_int_gssapi_close( LDAP *ld, LDAPConn *lc )
 582 {
 583         if ( lc && lc->lconn_gss_ctx ) {
 584                 OM_uint32 minor_status;
 585                 OM_uint32 ctx_flags = 0;
 586                 gss_ctx_id_t old_gss_ctx = GSS_C_NO_CONTEXT;
 587                 old_gss_ctx = (gss_ctx_id_t)lc->lconn_gss_ctx;
 588
 589                 gss_inquire_context(&minor_status,
 590                                     old_gss_ctx,
 591                                     NULL,
 592                                     NULL,
 593                                     NULL,
 594                                     NULL,
 595                                     &ctx_flags,
 596                                     NULL,
 597                                     NULL);
 598
 599                 if (!( ld->ld_options.ldo_gssapi_options & LDAP_GSSAPI_OPT_DO_NOT_FREE_GSS_CONTEXT )) {
 600                         gss_delete_sec_context( &minor_status, &old_gss_ctx, GSS_C_NO_BUFFER );
 601                 }
 602                 lc->lconn_gss_ctx = GSS_C_NO_CONTEXT;
 603
 604                 if (ctx_flags & (GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG)) {
 605                         /* remove wrapping layer */
 606                         sb_sasl_gssapi_remove( lc->lconn_sb );
 607                 }
 608         }
 609 }
 610
 611 static void
 612 ldap_int_gssapi_setup(
 613         LDAP *ld,
 614         LDAPConn *lc,
 615         gss_ctx_id_t gss_ctx)
 616 {
 617         OM_uint32 minor_status;
 618         OM_uint32 ctx_flags = 0;
 619
 620         ldap_int_gssapi_close( ld, lc );
 621
 622         gss_inquire_context(&minor_status,
 623                             gss_ctx,
 624                             NULL,
 625                             NULL,
 626                             NULL,
 627                             NULL,
 628                             &ctx_flags,
 629                             NULL,
 630                             NULL);
 631
 632         lc->lconn_gss_ctx = gss_ctx;
 633
 634         if (ctx_flags & (GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG)) {
 635                 /* setup wrapping layer */
 636                 sb_sasl_gssapi_install( lc->lconn_sb, gss_ctx );
 637         }
 638 }
 639
 640 #ifdef LDAP_R_COMPILE
 641 ldap_pvt_thread_mutex_t ldap_int_gssapi_mutex;
 642 #endif
 643
 644 static int
 645 ldap_int_gss_spnego_bind_s( LDAP *ld )
 646 {
 647         int rc;
 648         int gss_rc;
 649         OM_uint32 minor_status;
 650         char *mechlist = NULL;
 651         char *ldapServiceName = NULL;
 652         char *dnsHostName = NULL;
 653         gss_OID_set supported_mechs = GSS_C_NO_OID_SET;
 654         int spnego_support = 0;
 655 #define __SPNEGO_OID_LENGTH 6
 656 #define __SPNEGO_OID "\053\006\001\005\005\002"
 657         gss_OID_desc spnego_oid = {__SPNEGO_OID_LENGTH, __SPNEGO_OID};
 658         gss_OID req_mech = GSS_C_NO_OID;
 659         gss_OID ret_mech = GSS_C_NO_OID;
 660         gss_ctx_id_t gss_ctx = GSS_C_NO_CONTEXT;
 661         gss_name_t principal = GSS_C_NO_NAME;
 662         OM_uint32 req_flags;
 663         OM_uint32 ret_flags;
 664         gss_buffer_desc input_token, output_token = GSS_C_EMPTY_BUFFER;
 665         struct berval cred, *scred = NULL;
 666
 667         LDAP_MUTEX_LOCK( &ldap_int_gssapi_mutex );
 668
 669         /* get information from RootDSE entry */
 670         rc = ldap_gssapi_get_rootdse_infos ( ld, &mechlist,
 671                                              &ldapServiceName, &dnsHostName);
 672         if ( rc != LDAP_SUCCESS ) {
 673                 return rc;
 674         }
 675
 676         /* check that the server supports GSS-SPNEGO */
 677         rc = check_for_gss_spnego_support( ld, mechlist );
 678         if ( rc != LDAP_SUCCESS ) {
 679                 goto rc_error;
 680         }
 681
 682         /* prepare new gss_ctx_id_t */
 683         rc = guess_service_principal( ld, ldapServiceName, dnsHostName, &principal );
 684         if ( rc != LDAP_SUCCESS ) {
 685                 goto rc_error;
 686         }
 687
 688         /* see if our gssapi library supports spnego */
 689         gss_rc = gss_indicate_mechs( &minor_status, &supported_mechs );
 690         if ( gss_rc != GSS_S_COMPLETE ) {
 691                 goto gss_error;
 692         }
 693         gss_rc = gss_test_oid_set_member( &minor_status,
 694                 &spnego_oid, supported_mechs, &spnego_support);
 695         gss_release_oid_set( &minor_status, &supported_mechs);
 696         if ( gss_rc != GSS_S_COMPLETE ) {
 697                 goto gss_error;
 698         }
 699         if ( spnego_support != 0 ) {
 700                 req_mech = &spnego_oid;
 701         }
 702
 703         req_flags = ld->ld_options.ldo_gssapi_flags;
 704         req_flags |= GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG;
 705
 706         /*
 707          * loop around gss_init_sec_context() and ldap_sasl_bind_s()
 708          */
 709         input_token.value = NULL;
 710         input_token.length = 0;
 711         gss_rc = gss_init_sec_context(&minor_status,
 712                                       GSS_C_NO_CREDENTIAL,
 713                                       &gss_ctx,
 714                                       principal,
 715                                       req_mech,
 716                                       req_flags,
 717                                       0,
 718                                       NULL,
 719                                       &input_token,
 720                                       &ret_mech,
 721                                       &output_token,
 722                                       &ret_flags,
 723                                       NULL);
 724         if ( gss_rc == GSS_S_COMPLETE ) {
 725                 rc = LDAP_INAPPROPRIATE_AUTH;
 726                 goto rc_error;
 727         }
 728         if ( gss_rc != GSS_S_CONTINUE_NEEDED ) {
 729                 goto gss_error;
 730         }
 731         while (1) {
 732                 cred.bv_val = (char *)output_token.value;
 733                 cred.bv_len = output_token.length;
 734                 rc = ldap_sasl_bind_s( ld, NULL, "GSS-SPNEGO", &cred, NULL, NULL, &scred );
 735                 gss_release_buffer( &minor_status, &output_token );
 736                 if ( rc != LDAP_SUCCESS && rc != LDAP_SASL_BIND_IN_PROGRESS ) {
 737                         goto rc_error;
 738                 }
 739
 740                 if ( scred ) {
 741                         input_token.value = scred->bv_val;
 742                         input_token.length = scred->bv_len;
 743                 } else {
 744                         input_token.value = NULL;
 745                         input_token.length = 0;
 746                 }
 747
 748                 gss_rc = gss_init_sec_context(&minor_status,
 749                                               GSS_C_NO_CREDENTIAL,
 750                                               &gss_ctx,
 751                                               principal,
 752                                               req_mech,
 753                                               req_flags,
 754                                               0,
 755                                               NULL,
 756                                               &input_token,
 757                                               &ret_mech,
 758                                               &output_token,
 759                                               &ret_flags,
 760                                               NULL);
 761                 if ( scred ) {
 762                         ber_bvfree( scred );
 763                 }
 764                 if ( gss_rc == GSS_S_COMPLETE ) {
 765                         gss_release_buffer( &minor_status, &output_token );
 766                         break;
 767                 }
 768
 769                 if ( gss_rc != GSS_S_CONTINUE_NEEDED ) {
 770                         goto gss_error;
 771                 }
 772         }
 773
 774         ldap_int_gssapi_setup( ld, ld->ld_defconn, gss_ctx);
 775         gss_ctx = GSS_C_NO_CONTEXT;
 776
 777         rc = LDAP_SUCCESS;
 778         goto rc_error;
 779
 780 gss_error:
 781         rc = map_gsserr2ldap( ld,
 782                               (ret_mech != GSS_C_NO_OID ? ret_mech : req_mech ),
 783                               gss_rc, minor_status );
 784 rc_error:
 785         LDAP_MUTEX_UNLOCK( &ldap_int_gssapi_mutex );
 786         LDAP_FREE( mechlist );
 787         LDAP_FREE( ldapServiceName );
 788         LDAP_FREE( dnsHostName );
 789         gss_release_buffer( &minor_status, &output_token );
 790         if ( gss_ctx != GSS_C_NO_CONTEXT ) {
 791                 gss_delete_sec_context( &minor_status, &gss_ctx, GSS_C_NO_BUFFER );
 792         }
 793         if ( principal != GSS_C_NO_NAME ) {
 794                 gss_release_name( &minor_status, &principal );
 795         }
 796         return rc;
 797 }
 798
 799 int
 800 ldap_int_gssapi_config( struct ldapoptions *lo, int option, const char *arg )
 801 {
 802         int ok = 0;
 803
 804         switch( option ) {
 805         case LDAP_OPT_SIGN:
 806
 807                 if (!arg) {
 808                 } else if (strcasecmp(arg, "on") == 0) {
 809                         ok = 1;
 810                 } else if (strcasecmp(arg, "yes") == 0) {
 811                         ok = 1;
 812                 } else if (strcasecmp(arg, "true") == 0) {
 813                         ok = 1;
 814
 815                 }
 816                 if (ok) {
 817                         lo->ldo_gssapi_flags |= GSS_C_INTEG_FLAG;
 818                 }
 819
 820                 return 0;
 821
 822         case LDAP_OPT_ENCRYPT:
 823
 824                 if (!arg) {
 825                 } else if (strcasecmp(arg, "on") == 0) {
 826                         ok = 1;
 827                 } else if (strcasecmp(arg, "yes") == 0) {
 828                         ok = 1;
 829                 } else if (strcasecmp(arg, "true") == 0) {
 830                         ok = 1;
 831                 }
 832
 833                 if (ok) {
 834                         lo->ldo_gssapi_flags |= GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG;
 835                 }
 836
 837                 return 0;
 838
 839         case LDAP_OPT_X_GSSAPI_ALLOW_REMOTE_PRINCIPAL:
 840
 841                 if (!arg) {
 842                 } else if (strcasecmp(arg, "on") == 0) {
 843                         ok = 1;
 844                 } else if (strcasecmp(arg, "yes") == 0) {
 845                         ok = 1;
 846                 } else if (strcasecmp(arg, "true") == 0) {
 847                         ok = 1;
 848                 }
 849
 850                 if (ok) {
 851                         lo->ldo_gssapi_options |= LDAP_GSSAPI_OPT_ALLOW_REMOTE_PRINCIPAL;
 852                 }
 853
 854                 return 0;
 855         }
 856
 857         return -1;
 858 }
 859
 860 int
 861 ldap_int_gssapi_get_option( LDAP *ld, int option, void *arg )
 862 {
 863         if ( ld == NULL )
 864                 return -1;
 865
 866         switch ( option ) {
 867         case LDAP_OPT_SSPI_FLAGS:
 868                 * (unsigned *) arg = (unsigned) ld->ld_options.ldo_gssapi_flags;
 869                 break;
 870
 871         case LDAP_OPT_SIGN:
 872                 if ( ld->ld_options.ldo_gssapi_flags & GSS_C_INTEG_FLAG ) {
 873                         * (int *) arg = (int)-1;
 874                 } else {
 875                         * (int *) arg = (int)0;
 876                 }
 877                 break;
 878
 879         case LDAP_OPT_ENCRYPT:
 880                 if ( ld->ld_options.ldo_gssapi_flags & GSS_C_CONF_FLAG ) {
 881                         * (int *) arg = (int)-1;
 882                 } else {
 883                         * (int *) arg = (int)0;
 884                 }
 885                 break;
 886
 887         case LDAP_OPT_SASL_METHOD:
 888                 * (char **) arg = LDAP_STRDUP("GSS-SPNEGO");
 889                 break;
 890
 891         case LDAP_OPT_SECURITY_CONTEXT:
 892                 if ( ld->ld_defconn && ld->ld_defconn->lconn_gss_ctx ) {
 893                         * (gss_ctx_id_t *) arg = (gss_ctx_id_t)ld->ld_defconn->lconn_gss_ctx;
 894                 } else {
 895                         * (gss_ctx_id_t *) arg = GSS_C_NO_CONTEXT;
 896                 }
 897                 break;
 898
 899         case LDAP_OPT_X_GSSAPI_DO_NOT_FREE_CONTEXT:
 900                 if ( ld->ld_options.ldo_gssapi_options & LDAP_GSSAPI_OPT_DO_NOT_FREE_GSS_CONTEXT ) {
 901                         * (int *) arg = (int)-1;
 902                 } else {
 903                         * (int *) arg = (int)0;
 904                 }
 905                 break;
 906
 907         case LDAP_OPT_X_GSSAPI_ALLOW_REMOTE_PRINCIPAL:
 908                 if ( ld->ld_options.ldo_gssapi_options & LDAP_GSSAPI_OPT_ALLOW_REMOTE_PRINCIPAL ) {
 909                         * (int *) arg = (int)-1;
 910                 } else {
 911                         * (int *) arg = (int)0;
 912                 }
 913                 break;
 914
 915         default:
 916                 return -1;
 917         }
 918
 919         return 0;
 920 }
 921
 922 int
 923 ldap_int_gssapi_set_option( LDAP *ld, int option, void *arg )
 924 {
 925         if ( ld == NULL )
 926                 return -1;
 927
 928         switch ( option ) {
 929         case LDAP_OPT_SSPI_FLAGS:
 930                 if ( arg != LDAP_OPT_OFF ) {
 931                         ld->ld_options.ldo_gssapi_flags = * (unsigned *)arg;
 932                 }
 933                 break;
 934
 935         case LDAP_OPT_SIGN:
 936                 if ( arg != LDAP_OPT_OFF ) {
 937                         ld->ld_options.ldo_gssapi_flags |= GSS_C_INTEG_FLAG;
 938                 }
 939                 break;
 940
 941         case LDAP_OPT_ENCRYPT:
 942                 if ( arg != LDAP_OPT_OFF ) {
 943                         ld->ld_options.ldo_gssapi_flags |= GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG;
 944                 }
 945                 break;
 946
 947         case LDAP_OPT_SASL_METHOD:
 948                 if ( arg != LDAP_OPT_OFF ) {
 949                         const char *m = (const char *)arg;
 950                         if ( strcmp( "GSS-SPNEGO", m ) != 0 ) {
 951                                 /* we currently only support GSS-SPNEGO */
 952                                 return -1;
 953                         }
 954                 }
 955                 break;
 956
 957         case LDAP_OPT_SECURITY_CONTEXT:
 958                 if ( arg != LDAP_OPT_OFF && ld->ld_defconn) {
 959                         ldap_int_gssapi_setup( ld, ld->ld_defconn,
 960                                                (gss_ctx_id_t) arg);
 961                 }
 962                 break;
 963
 964         case LDAP_OPT_X_GSSAPI_DO_NOT_FREE_CONTEXT:
 965                 if ( arg != LDAP_OPT_OFF ) {
 966                         ld->ld_options.ldo_gssapi_options |= LDAP_GSSAPI_OPT_DO_NOT_FREE_GSS_CONTEXT;
 967                 }
 968                 break;
 969
 970         case LDAP_OPT_X_GSSAPI_ALLOW_REMOTE_PRINCIPAL:
 971                 if ( arg != LDAP_OPT_OFF ) {
 972                         ld->ld_options.ldo_gssapi_options |= LDAP_GSSAPI_OPT_ALLOW_REMOTE_PRINCIPAL;
 973                 }
 974                 break;
 975
 976         default:
 977                 return -1;
 978         }
 979
 980         return 0;
 981 }
 982
 983 #else /* HAVE_GSSAPI */
 984 #define ldap_int_gss_spnego_bind_s(ld) LDAP_NOT_SUPPORTED
 985 #endif /* HAVE_GSSAPI */
 986
 987 int
 988 ldap_gssapi_bind(
 989         LDAP *ld,
 990         LDAP_CONST char *dn,
 991         LDAP_CONST char *creds )
 992 {
 993         return LDAP_NOT_SUPPORTED;
 994 }
 995
 996 int
 997 ldap_gssapi_bind_s(
 998         LDAP *ld,
 999         LDAP_CONST char *dn,
1000         LDAP_CONST char *creds )
1001 {
1002         if ( dn != NULL ) {
1003                 return LDAP_NOT_SUPPORTED;
1004         }
1005
1006         if ( creds != NULL ) {
1007                 return LDAP_NOT_SUPPORTED;
1008         }
1009
1010         return ldap_int_gss_spnego_bind_s(ld);
1011 }