src/src/auths/heimdal_gssapi.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 /* Copyright (c) Twitter Inc 2012
   9    Author: Phil Pennock <pdp@exim.org> */
  10 /* Copyright (c) Phil Pennock 2012 */
  11
  12 /* Interface to Heimdal library for GSSAPI authentication. */
  13
  14 /* Naming and rationale
  15
  16 Sensibly, this integration would be deferred to a SASL library, but none
  17 of them appear to offer keytab file selection interfaces in their APIs.  It
  18 might be that this driver only requires minor modification to work with MIT
  19 Kerberos.
  20
  21 Heimdal provides a number of interfaces for various forms of authentication.
  22 As GS2 does not appear to provide keytab control interfaces either, we may
  23 end up supporting that too.  It's possible that we could trivially expand to
  24 support NTLM support via Heimdal, etc.  Rather than try to be too generic
  25 immediately, this driver is directly only supporting GSSAPI.
  26
  27 Without rename, we could add an option for GS2 support in the future.
  28 */
  29
  30 /* Sources
  31
  32 * mailcheck-imap (Perl, client-side, written by me years ago)
  33 * gsasl driver (GPL, server-side)
  34 * heimdal sources and man-pages, plus http://www.h5l.org/manual/
  35 * FreeBSD man-pages (very informative!)
  36 * http://www.ggf.org/documents/GFD.24.pdf confirming GSS_KRB5_REGISTER_ACCEPTOR_IDENTITY_X
  37   semantics, that found by browsing Heimdal source to find how to set the keytab; however,
  38   after multiple attempts I failed to get that to work and instead switched to
  39   gsskrb5_register_acceptor_identity().
  40 */
  41
  42 #include "../exim.h"
  43
  44 #ifndef AUTH_HEIMDAL_GSSAPI
  45 /* dummy function to satisfy compilers when we link in an "empty" file. */
  46 static void dummy(int x);
  47 static void dummy2(int x) { dummy(x-1); }
  48 static void dummy(int x) { dummy2(x-1); }
  49 #else
  50
  51 #include <gssapi/gssapi.h>
  52 #include <gssapi/gssapi_krb5.h>
  53
  54 /* for the _init debugging */
  55 #include <krb5.h>
  56
  57 #include "heimdal_gssapi.h"
  58
  59 /* Authenticator-specific options. */
  60 optionlist auth_heimdal_gssapi_options[] = {
  61   { "server_hostname",      opt_stringptr,
  62       OPT_OFF(auth_heimdal_gssapi_options_block, server_hostname) },
  63   { "server_keytab",        opt_stringptr,
  64       OPT_OFF(auth_heimdal_gssapi_options_block, server_keytab) },
  65   { "server_service",       opt_stringptr,
  66       OPT_OFF(auth_heimdal_gssapi_options_block, server_service) }
  67 };
  68
  69 int auth_heimdal_gssapi_options_count =
  70   sizeof(auth_heimdal_gssapi_options)/sizeof(optionlist);
  71
  72 /* Defaults for the authenticator-specific options. */
  73 auth_heimdal_gssapi_options_block auth_heimdal_gssapi_option_defaults = {
  74   US"$primary_hostname",    /* server_hostname */
  75   NULL,                     /* server_keytab */
  76   US"smtp",                 /* server_service */
  77 };
  78
  79
  80 #ifdef MACRO_PREDEF
  81
  82 /* Dummy values */
  83 void auth_heimdal_gssapi_init(auth_instance *ablock) {}
  84 int auth_heimdal_gssapi_server(auth_instance *ablock, uschar *data) {return 0;}
  85 int auth_heimdal_gssapi_client(auth_instance *ablock, void * sx,
  86   int timeout, uschar *buffer, int buffsize) {return 0;}
  87 void auth_heimdal_gssapi_version_report(FILE *f) {}
  88
  89 #else   /*!MACRO_PREDEF*/
  90
  91
  92
  93 /* "Globals" for managing the heimdal_gssapi interface. */
  94
  95 /* Utility functions */
  96 static void
  97   exim_heimdal_error_debug(const char *, krb5_context, krb5_error_code);
  98 static int
  99   exim_gssapi_error_defer(rmark, OM_uint32, OM_uint32, const char *, ...)
 100     PRINTF_FUNCTION(4, 5);
 101
 102 #define EmptyBuf(buf) do { buf.value = NULL; buf.length = 0; } while (0)
 103
 104
 105 /*************************************************
 106 *          Initialization entry point            *
 107 *************************************************/
 108
 109 /* Called for each instance, after its options have been read, to
 110 enable consistency checks to be done, or anything else that needs
 111 to be set up. */
 112
 113 /* Heimdal provides a GSSAPI extension method for setting the keytab;
 114 in the init, we mostly just use raw krb5 methods so that we can report
 115 the keytab contents, for -D+auth debugging. */
 116
 117 void
 118 auth_heimdal_gssapi_init(auth_instance *ablock)
 119 {
 120 krb5_context context;
 121 krb5_keytab keytab;
 122 krb5_kt_cursor cursor;
 123 krb5_keytab_entry entry;
 124 krb5_error_code krc;
 125 char *principal, *enctype_s;
 126 const char *k_keytab_typed_name = NULL;
 127 auth_heimdal_gssapi_options_block *ob =
 128   (auth_heimdal_gssapi_options_block *)(ablock->options_block);
 129
 130 ablock->server = FALSE;
 131 ablock->client = FALSE;
 132
 133 if (!ob->server_service || !*ob->server_service)
 134   {
 135   HDEBUG(D_auth) debug_printf("heimdal: missing server_service\n");
 136   return;
 137   }
 138
 139 if ((krc = krb5_init_context(&context)))
 140   {
 141   int kerr = errno;
 142   HDEBUG(D_auth) debug_printf("heimdal: failed to initialise krb5 context: %s\n",
 143       strerror(kerr));
 144   return;
 145   }
 146
 147 if (ob->server_keytab)
 148   {
 149   k_keytab_typed_name = CCS string_sprintf("file:%s", expand_string(ob->server_keytab));
 150   HDEBUG(D_auth) debug_printf("heimdal: using keytab %s\n", k_keytab_typed_name);
 151   if ((krc = krb5_kt_resolve(context, k_keytab_typed_name, &keytab)))
 152     {
 153     HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_resolve", context, krc);
 154     return;
 155     }
 156   }
 157 else
 158  {
 159   HDEBUG(D_auth) debug_printf("heimdal: using system default keytab\n");
 160   if ((krc = krb5_kt_default(context, &keytab)))
 161     {
 162     HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_default", context, krc);
 163     return;
 164     }
 165   }
 166
 167 HDEBUG(D_auth)
 168   {
 169   /* http://www.h5l.org/manual/HEAD/krb5/krb5_keytab_intro.html */
 170   if ((krc = krb5_kt_start_seq_get(context, keytab, &cursor)))
 171     exim_heimdal_error_debug("krb5_kt_start_seq_get", context, krc);
 172   else
 173     {
 174     while (!(krc = krb5_kt_next_entry(context, keytab, &entry, &cursor)))
 175       {
 176       principal = enctype_s = NULL;
 177       krb5_unparse_name(context, entry.principal, &principal);
 178       krb5_enctype_to_string(context, entry.keyblock.keytype, &enctype_s);
 179       debug_printf("heimdal: keytab principal: %s  vno=%d  type=%s\n",
 180           principal ? principal : "??",
 181           entry.vno,
 182           enctype_s ? enctype_s : "??");
 183       free(principal);
 184       free(enctype_s);
 185       krb5_kt_free_entry(context, &entry);
 186       }
 187     if ((krc = krb5_kt_end_seq_get(context, keytab, &cursor)))
 188       exim_heimdal_error_debug("krb5_kt_end_seq_get", context, krc);
 189     }
 190   }
 191
 192 if ((krc = krb5_kt_close(context, keytab)))
 193   HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_close", context, krc);
 194
 195 krb5_free_context(context);
 196
 197 ablock->server = TRUE;
 198 }
 199
 200
 201 static void
 202 exim_heimdal_error_debug(const char *label,
 203     krb5_context context, krb5_error_code err)
 204 {
 205 const char *kerrsc;
 206 kerrsc = krb5_get_error_message(context, err);
 207 debug_printf("heimdal %s: %s\n", label, kerrsc ? kerrsc : "unknown error");
 208 krb5_free_error_message(context, kerrsc);
 209 }
 210
 211 /*************************************************
 212 *             Server entry point                 *
 213 *************************************************/
 214
 215 /* For interface, see auths/README */
 216
 217 /* GSSAPI notes:
 218 OM_uint32: portable type for unsigned int32
 219 gss_buffer_desc / *gss_buffer_t: hold/point-to size_t .length & void *value
 220   -- all strings/etc passed in should go through one of these
 221   -- when allocated by gssapi, release with gss_release_buffer()
 222 */
 223
 224 int
 225 auth_heimdal_gssapi_server(auth_instance *ablock, uschar *initial_data)
 226 {
 227 gss_name_t gclient = GSS_C_NO_NAME;
 228 gss_name_t gserver = GSS_C_NO_NAME;
 229 gss_cred_id_t gcred = GSS_C_NO_CREDENTIAL;
 230 gss_ctx_id_t gcontext = GSS_C_NO_CONTEXT;
 231 uschar *ex_server_str;
 232 gss_buffer_desc gbufdesc = GSS_C_EMPTY_BUFFER;
 233 gss_buffer_desc gbufdesc_in = GSS_C_EMPTY_BUFFER;
 234 gss_buffer_desc gbufdesc_out = GSS_C_EMPTY_BUFFER;
 235 gss_OID mech_type;
 236 OM_uint32 maj_stat, min_stat;
 237 int step, error_out;
 238 uschar *tmp1, *tmp2, *from_client;
 239 auth_heimdal_gssapi_options_block *ob =
 240   (auth_heimdal_gssapi_options_block *)(ablock->options_block);
 241 BOOL handled_empty_ir;
 242 rmark store_reset_point;
 243 uschar *keytab;
 244 uschar sasl_config[4];
 245 uschar requested_qop;
 246
 247 store_reset_point = store_mark();
 248
 249 HDEBUG(D_auth)
 250   debug_printf("heimdal: initialising auth context for %s\n", ablock->name);
 251
 252 /* Construct our gss_name_t gserver describing ourselves */
 253 tmp1 = expand_string(ob->server_service);
 254 tmp2 = expand_string(ob->server_hostname);
 255 ex_server_str = string_sprintf("%s@%s", tmp1, tmp2);
 256 gbufdesc.value = (void *) ex_server_str;
 257 gbufdesc.length = Ustrlen(ex_server_str);
 258 maj_stat = gss_import_name(&min_stat,
 259     &gbufdesc, GSS_C_NT_HOSTBASED_SERVICE, &gserver);
 260 if (GSS_ERROR(maj_stat))
 261   return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat,
 262       "gss_import_name(%s)", CS gbufdesc.value);
 263
 264 /* Use a specific keytab, if specified */
 265 if (ob->server_keytab)
 266   {
 267   keytab = expand_string(ob->server_keytab);
 268   maj_stat = gsskrb5_register_acceptor_identity(CCS keytab);
 269   if (GSS_ERROR(maj_stat))
 270     return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat,
 271         "registering keytab \"%s\"", keytab);
 272   HDEBUG(D_auth)
 273     debug_printf("heimdal: using keytab \"%s\"\n", keytab);
 274   }
 275
 276 /* Acquire our credentials */
 277 maj_stat = gss_acquire_cred(&min_stat,
 278     gserver,             /* desired name */
 279     0,                   /* time */
 280     GSS_C_NULL_OID_SET,  /* desired mechs */
 281     GSS_C_ACCEPT,        /* cred usage */
 282     &gcred,              /* handle */
 283     NULL                 /* actual mechs */,
 284     NULL                 /* time rec */);
 285 if (GSS_ERROR(maj_stat))
 286   return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat,
 287       "gss_acquire_cred(%s)", ex_server_str);
 288
 289 maj_stat = gss_release_name(&min_stat, &gserver);
 290
 291 HDEBUG(D_auth) debug_printf("heimdal: have server credentials.\n");
 292
 293 /* Loop talking to client */
 294 step = 0;
 295 from_client = initial_data;
 296 handled_empty_ir = FALSE;
 297 error_out = OK;
 298
 299 /* buffer sizes: auth_get_data() uses big_buffer, which we grow per
 300 GSSAPI RFC in _init, if needed, to meet the SHOULD size of 64KB.
 301 (big_buffer starts life at the MUST size of 16KB). */
 302
 303 /* step values
 304 0: getting initial data from client to feed into GSSAPI
 305 1: iterating for as long as GSS_S_CONTINUE_NEEDED
 306 2: GSS_S_COMPLETE, SASL wrapping for authz and qop to send to client
 307 3: unpick final auth message from client
 308 4: break/finish (non-step)
 309 */
 310 while (step < 4)
 311   switch (step)
 312     {
 313     case 0:
 314       if (!from_client || !*from_client)
 315         {
 316         if (handled_empty_ir)
 317           {
 318           HDEBUG(D_auth) debug_printf("gssapi: repeated empty input, grr.\n");
 319           error_out = BAD64;
 320           goto ERROR_OUT;
 321           }
 322
 323         HDEBUG(D_auth) debug_printf("gssapi: missing initial response, nudging.\n");
 324         error_out = auth_get_data(&from_client, US"", 0);
 325         if (error_out != OK)
 326           goto ERROR_OUT;
 327         handled_empty_ir = TRUE;
 328         continue;
 329         }
 330       /* We should now have the opening data from the client, base64-encoded. */
 331       step += 1;
 332       HDEBUG(D_auth) debug_printf("heimdal: have initial client data\n");
 333       break;
 334
 335     case 1:
 336       gbufdesc_in.length = b64decode(from_client, USS &gbufdesc_in.value);
 337       if (gclient)
 338         {
 339         maj_stat = gss_release_name(&min_stat, &gclient);
 340         gclient = GSS_C_NO_NAME;
 341         }
 342       maj_stat = gss_accept_sec_context(&min_stat,
 343           &gcontext,          /* context handle */
 344           gcred,              /* acceptor cred handle */
 345           &gbufdesc_in,       /* input from client */
 346           GSS_C_NO_CHANNEL_BINDINGS,  /* XXX fixme: use the channel bindings from GnuTLS */
 347           &gclient,           /* client identifier */
 348           &mech_type,         /* mechanism in use */
 349           &gbufdesc_out,      /* output to send to client */
 350           NULL,               /* return flags */
 351           NULL,               /* time rec */
 352           NULL                /* delegated cred_handle */
 353           );
 354       if (GSS_ERROR(maj_stat))
 355         {
 356         exim_gssapi_error_defer(NULL, maj_stat, min_stat,
 357             "gss_accept_sec_context()");
 358         error_out = FAIL;
 359         goto ERROR_OUT;
 360         }
 361       if (gbufdesc_out.length != 0)
 362         {
 363         error_out = auth_get_data(&from_client,
 364             gbufdesc_out.value, gbufdesc_out.length);
 365         if (error_out != OK)
 366           goto ERROR_OUT;
 367
 368         gss_release_buffer(&min_stat, &gbufdesc_out);
 369         EmptyBuf(gbufdesc_out);
 370         }
 371       if (maj_stat == GSS_S_COMPLETE)
 372         {
 373         step += 1;
 374         HDEBUG(D_auth) debug_printf("heimdal: GSS complete\n");
 375         }
 376       else
 377         HDEBUG(D_auth) debug_printf("heimdal: need more data\n");
 378       break;
 379
 380     case 2:
 381       memset(sasl_config, 0xFF, 4);
 382       /* draft-ietf-sasl-gssapi-06.txt defines bitmasks for first octet
 383       0x01 No security layer
 384       0x02 Integrity protection
 385       0x04 Confidentiality protection
 386
 387       The remaining three octets are the maximum buffer size for wrapped
 388       content. */
 389       sasl_config[0] = 0x01;  /* Exim does not wrap/unwrap SASL layers after auth */
 390       gbufdesc.value = (void *) sasl_config;
 391       gbufdesc.length = 4;
 392       maj_stat = gss_wrap(&min_stat,
 393           gcontext,
 394           0,                    /* conf_req_flag: integrity only */
 395           GSS_C_QOP_DEFAULT,    /* qop requested */
 396           &gbufdesc,            /* message to protect */
 397           NULL,                 /* conf_state: no confidentiality applied */
 398           &gbufdesc_out         /* output buffer */
 399           );
 400       if (GSS_ERROR(maj_stat))
 401         {
 402         exim_gssapi_error_defer(NULL, maj_stat, min_stat,
 403             "gss_wrap(SASL state after auth)");
 404         error_out = FAIL;
 405         goto ERROR_OUT;
 406         }
 407
 408       HDEBUG(D_auth) debug_printf("heimdal SASL: requesting QOP with no security layers\n");
 409
 410       error_out = auth_get_data(&from_client,
 411           gbufdesc_out.value, gbufdesc_out.length);
 412       if (error_out != OK)
 413         goto ERROR_OUT;
 414
 415       gss_release_buffer(&min_stat, &gbufdesc_out);
 416       EmptyBuf(gbufdesc_out);
 417       step += 1;
 418       break;
 419
 420     case 3:
 421       gbufdesc_in.length = b64decode(from_client, USS &gbufdesc_in.value);
 422       maj_stat = gss_unwrap(&min_stat,
 423           gcontext,
 424           &gbufdesc_in,       /* data from client */
 425           &gbufdesc_out,      /* results */
 426           NULL,               /* conf state */
 427           NULL                /* qop state */
 428           );
 429       if (GSS_ERROR(maj_stat))
 430         {
 431         exim_gssapi_error_defer(NULL, maj_stat, min_stat,
 432             "gss_unwrap(final SASL message from client)");
 433         error_out = FAIL;
 434         goto ERROR_OUT;
 435         }
 436       if (gbufdesc_out.length < 4)
 437         {
 438         HDEBUG(D_auth)
 439           debug_printf("gssapi: final message too short; "
 440               "need flags, buf sizes and optional authzid\n");
 441         error_out = FAIL;
 442         goto ERROR_OUT;
 443         }
 444
 445       requested_qop = (CS gbufdesc_out.value)[0];
 446       if (!(requested_qop & 0x01))
 447         {
 448         HDEBUG(D_auth)
 449           debug_printf("gssapi: client requested security layers (%x)\n",
 450               (unsigned int) requested_qop);
 451         error_out = FAIL;
 452         goto ERROR_OUT;
 453         }
 454
 455       for (int i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL;
 456       expand_nmax = 0;
 457
 458       /* Identifiers:
 459       The SASL provided identifier is an unverified authzid.
 460       GSSAPI provides us with a verified identifier, but it might be empty
 461       for some clients.
 462       */
 463
 464       /* $auth2 is authzid requested at SASL layer */
 465       if (gbufdesc_out.length > 4)
 466         {
 467         expand_nlength[2] = gbufdesc_out.length - 4;
 468         auth_vars[1] = expand_nstring[2] =
 469           string_copyn((US gbufdesc_out.value) + 4, expand_nlength[2]);
 470         expand_nmax = 2;
 471         }
 472
 473       gss_release_buffer(&min_stat, &gbufdesc_out);
 474       EmptyBuf(gbufdesc_out);
 475
 476       /* $auth1 is GSSAPI display name */
 477       maj_stat = gss_display_name(&min_stat,
 478           gclient, &gbufdesc_out, &mech_type);
 479       if (GSS_ERROR(maj_stat))
 480         {
 481         auth_vars[1] = expand_nstring[2] = NULL;
 482         expand_nmax = 0;
 483         exim_gssapi_error_defer(NULL, maj_stat, min_stat,
 484             "gss_display_name(client identifier)");
 485         error_out = FAIL;
 486         goto ERROR_OUT;
 487         }
 488
 489       expand_nlength[1] = gbufdesc_out.length;
 490       auth_vars[0] = expand_nstring[1] =
 491         string_copyn(gbufdesc_out.value, gbufdesc_out.length);
 492
 493       if (expand_nmax == 0)     /* should be: authzid was empty */
 494         {
 495         expand_nmax = 2;
 496         expand_nlength[2] = expand_nlength[1];
 497         auth_vars[1] = expand_nstring[2] = string_copyn(expand_nstring[1], expand_nlength[1]);
 498         HDEBUG(D_auth)
 499           debug_printf("heimdal SASL: empty authzid, set to dup of GSSAPI display name\n");
 500         }
 501
 502       HDEBUG(D_auth)
 503         debug_printf("heimdal SASL: happy with client request\n"
 504            "  auth1 (verified GSSAPI display-name): \"%s\"\n"
 505            "  auth2 (unverified SASL requested authzid): \"%s\"\n",
 506            auth_vars[0], auth_vars[1]);
 507
 508       step += 1;
 509       break;
 510
 511     } /* switch */
 512   /* while step */
 513
 514
 515 ERROR_OUT:
 516 maj_stat = gss_release_cred(&min_stat, &gcred);
 517 if (gclient)
 518   {
 519   gss_release_name(&min_stat, &gclient);
 520   gclient = GSS_C_NO_NAME;
 521   }
 522 if (gbufdesc_out.length)
 523   {
 524   gss_release_buffer(&min_stat, &gbufdesc_out);
 525   EmptyBuf(gbufdesc_out);
 526   }
 527 if (gcontext != GSS_C_NO_CONTEXT)
 528   gss_delete_sec_context(&min_stat, &gcontext, GSS_C_NO_BUFFER);
 529
 530 store_reset(store_reset_point);
 531
 532 if (error_out != OK)
 533   return error_out;
 534
 535 /* Auth succeeded, check server_condition */
 536 return auth_check_serv_cond(ablock);
 537 }
 538
 539
 540 static int
 541 exim_gssapi_error_defer(rmark store_reset_point,
 542     OM_uint32 major, OM_uint32 minor,
 543     const char *format, ...)
 544 {
 545 va_list ap;
 546 OM_uint32 maj_stat, min_stat;
 547 OM_uint32 msgcontext = 0;
 548 gss_buffer_desc status_string;
 549 gstring * g;
 550
 551 HDEBUG(D_auth)
 552   {
 553   va_start(ap, format);
 554   g = string_vformat(NULL, SVFMT_EXTEND|SVFMT_REBUFFER, format, ap);
 555   va_end(ap);
 556   }
 557
 558 auth_defer_msg = NULL;
 559
 560 do {
 561   maj_stat = gss_display_status(&min_stat,
 562       major, GSS_C_GSS_CODE, GSS_C_NO_OID, &msgcontext, &status_string);
 563
 564   if (!auth_defer_msg)
 565     auth_defer_msg = string_copy(US status_string.value);
 566
 567   HDEBUG(D_auth) debug_printf("heimdal %s: %.*s\n",
 568       string_from_gstring(g), (int)status_string.length,
 569       CS status_string.value);
 570   gss_release_buffer(&min_stat, &status_string);
 571
 572   } while (msgcontext != 0);
 573
 574 if (store_reset_point)
 575   store_reset(store_reset_point);
 576 return DEFER;
 577 }
 578
 579
 580 /*************************************************
 581 *              Client entry point                *
 582 *************************************************/
 583
 584 /* For interface, see auths/README */
 585
 586 int
 587 auth_heimdal_gssapi_client(
 588   auth_instance *ablock,                 /* authenticator block */
 589   void * sx,                             /* connection */
 590   int timeout,                           /* command timeout */
 591   uschar *buffer,                        /* buffer for reading response */
 592   int buffsize)                          /* size of buffer */
 593 {
 594 HDEBUG(D_auth)
 595   debug_printf("Client side NOT IMPLEMENTED: you should not see this!\n");
 596 /* NOT IMPLEMENTED */
 597 return FAIL;
 598 }
 599
 600 /*************************************************
 601 *                Diagnostic API                  *
 602 *************************************************/
 603
 604 void
 605 auth_heimdal_gssapi_version_report(FILE *f)
 606 {
 607 /* No build-time constants available unless we link against libraries at
 608 build-time and export the result as a string into a header ourselves. */
 609 fprintf(f, "Library version: Heimdal: Runtime: %s\n"
 610            " Build Info: %s\n",
 611         heimdal_version, heimdal_long_version);
 612 }
 613
 614 #endif   /*!MACRO_PREDEF*/
 615 #endif  /* AUTH_HEIMDAL_GSSAPI */
 616
 617 /* End of heimdal_gssapi.c */