mech_eap/util_name.c

   1 /*
   2  * Copyright (c) 2011, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32 /*
  33  * Portions Copyright 2009 by the Massachusetts Institute of Technology.
  34  * All Rights Reserved.
  35  *
  36  * Export of this software from the United States of America may
  37  *   require a specific license from the United States Government.
  38  *   It is the responsibility of any person or organization contemplating
  39  *   export to obtain such a license before exporting.
  40  *
  41  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
  42  * distribute this software and its documentation for any purpose and
  43  * without fee is hereby granted, provided that the above copyright
  44  * notice appear in all copies and that both that copyright notice and
  45  * this permission notice appear in supporting documentation, and that
  46  * the name of M.I.T. not be used in advertising or publicity pertaining
  47  * to distribution of the software without specific, written prior
  48  * permission.  Furthermore if you modify this software you must label
  49  * your software as modified software and not distribute it in such a
  50  * fashion that it might be confused with the original M.I.T. software.
  51  * M.I.T. makes no representations about the suitability of
  52  * this software for any purpose.  It is provided "as is" without express
  53  * or implied warranty.
  54  */
  55
  56 /*
  57  * Name utility routines.
  58  */
  59
  60 #include "gssapiP_eap.h"
  61
  62 static gss_OID_desc gssEapNtEapName = {
  63     /* 1.3.6.1.4.1.5322.22.2.1  */
  64     10, "\x2B\x06\x01\x04\x01\xA9\x4A\x16\x02\x01"
  65 };
  66
  67 gss_OID GSS_EAP_NT_EAP_NAME = &gssEapNtEapName;
  68
  69 OM_uint32
  70 gssEapAllocName(OM_uint32 *minor, gss_name_t *pName)
  71 {
  72     OM_uint32 tmpMinor;
  73     gss_name_t name;
  74
  75     *pName = GSS_C_NO_NAME;
  76
  77     name = (gss_name_t)GSSEAP_CALLOC(1, sizeof(*name));
  78     if (name == NULL) {
  79         *minor = ENOMEM;
  80         return GSS_S_FAILURE;
  81     }
  82
  83     if (GSSEAP_MUTEX_INIT(&name->mutex) != 0) {
  84         *minor = errno;
  85         gssEapReleaseName(&tmpMinor, &name);
  86         return GSS_S_FAILURE;
  87     }
  88
  89     *pName = name;
  90
  91     return GSS_S_COMPLETE;
  92 }
  93
  94 OM_uint32
  95 gssEapReleaseName(OM_uint32 *minor, gss_name_t *pName)
  96 {
  97     gss_name_t name;
  98     krb5_context krbContext = NULL;
  99     OM_uint32 tmpMinor;
 100
 101     *minor = 0;
 102
 103     if (pName == NULL) {
 104         return GSS_S_COMPLETE;
 105     }
 106
 107     name = *pName;
 108     if (name == GSS_C_NO_NAME) {
 109         return GSS_S_COMPLETE;
 110     }
 111
 112     GSSEAP_KRB_INIT(&krbContext);
 113     krb5_free_principal(krbContext, name->krbPrincipal);
 114     gssEapReleaseOid(&tmpMinor, &name->mechanismUsed);
 115
 116     gssEapReleaseAttrContext(&tmpMinor, name);
 117
 118     GSSEAP_MUTEX_DESTROY(&name->mutex);
 119     GSSEAP_FREE(name);
 120     *pName = NULL;
 121
 122     return GSS_S_COMPLETE;
 123 }
 124
 125 static OM_uint32
 126 krbPrincipalToName(OM_uint32 *minor,
 127                    krb5_principal *principal,
 128                    gss_name_t *pName)
 129 {
 130     OM_uint32 major;
 131     gss_name_t name;
 132
 133     major = gssEapAllocName(minor, &name);
 134     if (GSS_ERROR(major))
 135         return major;
 136
 137     name->krbPrincipal = *principal;
 138     *principal = NULL;
 139
 140     if (KRB_PRINC_LENGTH(name->krbPrincipal) > 1) {
 141         name->flags |= NAME_FLAG_SERVICE;
 142     } else {
 143         name->flags |= NAME_FLAG_NAI;
 144     }
 145
 146     *pName = name;
 147     *minor = 0;
 148
 149     return GSS_S_COMPLETE;
 150 }
 151
 152 static char *
 153 gssEapGetDefaultRealm(krb5_context krbContext)
 154 {
 155     char *defaultRealm = NULL;
 156
 157     krb5_appdefault_string(krbContext, "eap_gss",
 158                            NULL, "default_realm", "", &defaultRealm);
 159
 160     return defaultRealm;
 161 }
 162
 163 static OM_uint32
 164 importServiceName(OM_uint32 *minor,
 165                   const gss_buffer_t nameBuffer,
 166                   gss_name_t *pName)
 167 {
 168     OM_uint32 major;
 169     krb5_error_code code;
 170     krb5_context krbContext;
 171     krb5_principal krbPrinc;
 172     char *service, *host, *realm = NULL;
 173
 174     GSSEAP_KRB_INIT(&krbContext);
 175
 176     major = bufferToString(minor, nameBuffer, &service);
 177     if (GSS_ERROR(major))
 178         return major;
 179
 180     host = strchr(service, '@');
 181     if (host != NULL) {
 182         *host = '\0';
 183         host++;
 184     }
 185
 186     realm = gssEapGetDefaultRealm(krbContext);
 187
 188     code = krb5_build_principal(krbContext,
 189                                 &krbPrinc,
 190                                 realm != NULL ? strlen(realm) : 0,
 191                                 realm != NULL ? realm : "",
 192                                 service,
 193                                 host,
 194                                 NULL);
 195
 196     if (code == 0) {
 197         KRB_PRINC_TYPE(krbPrinc) = KRB5_NT_SRV_HST;
 198
 199         major = krbPrincipalToName(minor, &krbPrinc, pName);
 200         if (GSS_ERROR(major))
 201             krb5_free_principal(krbContext, krbPrinc);
 202     } else {
 203         major = GSS_S_FAILURE;
 204         *minor = GSSEAP_BAD_SERVICE_NAME;
 205     }
 206
 207     if (realm != NULL)
 208         GSSEAP_FREE(realm);
 209     GSSEAP_FREE(service);
 210
 211     return major;
 212 }
 213
 214 #define IMPORT_FLAG_DEFAULT_REALM           0x1
 215
 216 /*
 217  * Import an EAP name, possibly appending the default GSS EAP realm,
 218  */
 219 static OM_uint32
 220 importEapNameFlags(OM_uint32 *minor,
 221                    const gss_buffer_t nameBuffer,
 222                    OM_uint32 importFlags,
 223                    gss_name_t *pName)
 224 {
 225     OM_uint32 major;
 226     krb5_context krbContext;
 227     krb5_principal krbPrinc = NULL;
 228     krb5_error_code code;
 229     char *nameString;
 230
 231     GSSEAP_KRB_INIT(&krbContext);
 232
 233     if (nameBuffer == GSS_C_NO_BUFFER) {
 234         nameString = "";
 235         code = KRB5_PARSE_MALFORMED;
 236     } else {
 237         major = bufferToString(minor, nameBuffer, &nameString);
 238         if (GSS_ERROR(major))
 239             return major;
 240
 241         /*
 242          * First, attempt to parse the name on the assumption that it includes
 243          * a qualifying realm. This allows us to avoid accidentally appending
 244          * the default Kerberos realm to an unqualified name. (A bug in MIT
 245          * Kerberos prevents the default realm being set to an empty value.)
 246          */
 247         code = krb5_parse_name_flags(krbContext, nameString,
 248                                      KRB5_PRINCIPAL_PARSE_REQUIRE_REALM, &krbPrinc);
 249     }
 250
 251     if (code == KRB5_PARSE_MALFORMED) {
 252         char *defaultRealm = NULL;
 253         int parseFlags = 0;
 254
 255         /* Possibly append the default EAP realm if required */
 256         if (importFlags & IMPORT_FLAG_DEFAULT_REALM)
 257             defaultRealm = gssEapGetDefaultRealm(krbContext);
 258
 259         /* If no default realm, leave the realm empty in the parsed name */
 260         if (defaultRealm == NULL || defaultRealm[0] == '\0')
 261             parseFlags |= KRB5_PRINCIPAL_PARSE_NO_REALM;
 262
 263         code = krb5_parse_name_flags(krbContext, nameString, parseFlags, &krbPrinc);
 264
 265 #ifdef HAVE_HEIMDAL_VERSION
 266         if (code == 0 && KRB_PRINC_REALM(krbPrinc) == NULL) {
 267             KRB_PRINC_REALM(krbPrinc) = GSSEAP_CALLOC(1, sizeof(char));
 268             if (KRB_PRINC_REALM(krbPrinc) == NULL)
 269                 code = ENOMEM;
 270         }
 271 #endif
 272
 273         if (defaultRealm != NULL)
 274             GSSEAP_FREE(defaultRealm);
 275     }
 276
 277     if (nameBuffer != GSS_C_NO_BUFFER)
 278         GSSEAP_FREE(nameString);
 279
 280     if (code != 0) {
 281         *minor = code;
 282         return GSS_S_FAILURE;
 283     }
 284
 285     assert(krbPrinc != NULL);
 286
 287     major = krbPrincipalToName(minor, &krbPrinc, pName);
 288     if (GSS_ERROR(major))
 289         krb5_free_principal(krbContext, krbPrinc);
 290
 291     return major;
 292 }
 293
 294 static OM_uint32
 295 importEapName(OM_uint32 *minor,
 296               const gss_buffer_t nameBuffer,
 297               gss_name_t *pName)
 298 {
 299     return importEapNameFlags(minor, nameBuffer, 0, pName);
 300 }
 301
 302 static OM_uint32
 303 importUserName(OM_uint32 *minor,
 304                const gss_buffer_t nameBuffer,
 305                gss_name_t *pName)
 306 {
 307     return importEapNameFlags(minor, nameBuffer, IMPORT_FLAG_DEFAULT_REALM, pName);
 308 }
 309
 310 static OM_uint32
 311 importAnonymousName(OM_uint32 *minor,
 312                     const gss_buffer_t nameBuffer GSSEAP_UNUSED,
 313                     gss_name_t *pName)
 314 {
 315     return importEapNameFlags(minor, GSS_C_NO_BUFFER, 0, pName);
 316 }
 317
 318 #define UPDATE_REMAIN(n)    do {            \
 319         p += (n);                           \
 320         remain -= (n);                      \
 321     } while (0)
 322
 323 #define CHECK_REMAIN(n)     do {        \
 324         if (remain < (n)) {             \
 325             major = GSS_S_BAD_NAME;     \
 326             *minor = GSSEAP_TOK_TRUNC;  \
 327             goto cleanup;               \
 328         }                               \
 329     } while (0)
 330
 331 OM_uint32
 332 gssEapImportNameInternal(OM_uint32 *minor,
 333                          const gss_buffer_t nameBuffer,
 334                          gss_name_t *pName,
 335                          OM_uint32 flags)
 336 {
 337     OM_uint32 major, tmpMinor;
 338     krb5_context krbContext;
 339     unsigned char *p;
 340     size_t len, remain;
 341     gss_buffer_desc buf;
 342     enum gss_eap_token_type tokType;
 343     gss_name_t name = GSS_C_NO_NAME;
 344     gss_OID mechanismUsed = GSS_C_NO_OID;
 345
 346     GSSEAP_KRB_INIT(&krbContext);
 347
 348     p = (unsigned char *)nameBuffer->value;
 349     remain = nameBuffer->length;
 350
 351     if (flags & EXPORT_NAME_FLAG_OID) {
 352         gss_OID_desc mech;
 353
 354         /* TOK_ID || MECH_OID_LEN || MECH_OID */
 355         if (remain < 6) {
 356             *minor = GSSEAP_BAD_NAME_TOKEN;
 357             return GSS_S_BAD_NAME;
 358         }
 359
 360         if (flags & EXPORT_NAME_FLAG_COMPOSITE)
 361             tokType = TOK_TYPE_EXPORT_NAME_COMPOSITE;
 362         else
 363             tokType = TOK_TYPE_EXPORT_NAME;
 364
 365         /* TOK_ID */
 366         if (load_uint16_be(p) != tokType) {
 367             *minor = GSSEAP_WRONG_TOK_ID;
 368             return GSS_S_BAD_NAME;
 369         }
 370         UPDATE_REMAIN(2);
 371
 372         /* MECH_OID_LEN */
 373         len = load_uint16_be(p);
 374         if (len < 2) {
 375             *minor = GSSEAP_BAD_NAME_TOKEN;
 376             return GSS_S_BAD_NAME;
 377         }
 378         UPDATE_REMAIN(2);
 379
 380         /* MECH_OID */
 381         if (p[0] != 0x06) {
 382             *minor = GSSEAP_BAD_NAME_TOKEN;
 383             return GSS_S_BAD_NAME;
 384         }
 385
 386         mech.length = p[1];
 387         mech.elements = &p[2];
 388
 389         CHECK_REMAIN(mech.length);
 390
 391         major = gssEapCanonicalizeOid(minor,
 392                                       &mech,
 393                                       OID_FLAG_FAMILY_MECH_VALID |
 394                                         OID_FLAG_MAP_FAMILY_MECH_TO_NULL,
 395                                       &mechanismUsed);
 396         if (GSS_ERROR(major))
 397             goto cleanup;
 398
 399         UPDATE_REMAIN(2 + mech.length);
 400     }
 401
 402     /* NAME_LEN */
 403     CHECK_REMAIN(4);
 404     len = load_uint32_be(p);
 405     UPDATE_REMAIN(4);
 406
 407     /* NAME */
 408     CHECK_REMAIN(len);
 409     buf.length = len;
 410     buf.value = p;
 411     UPDATE_REMAIN(len);
 412
 413     major = importEapNameFlags(minor, &buf, 0, &name);
 414     if (GSS_ERROR(major))
 415         goto cleanup;
 416
 417     name->mechanismUsed = mechanismUsed;
 418     mechanismUsed = GSS_C_NO_OID;
 419
 420     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 421         gss_buffer_desc buf;
 422
 423         buf.length = remain;
 424         buf.value = p;
 425
 426         major = gssEapImportAttrContext(minor, &buf, name);
 427         if (GSS_ERROR(major))
 428             goto cleanup;
 429     }
 430
 431     major = GSS_S_COMPLETE;
 432     *minor = 0;
 433
 434 cleanup:
 435     if (GSS_ERROR(major)) {
 436         gssEapReleaseOid(&tmpMinor, &mechanismUsed);
 437         gssEapReleaseName(&tmpMinor, &name);
 438     } else {
 439         *pName = name;
 440     }
 441
 442     return major;
 443 }
 444
 445 static OM_uint32
 446 importExportName(OM_uint32 *minor,
 447                  const gss_buffer_t nameBuffer,
 448                  gss_name_t *name)
 449 {
 450     return gssEapImportNameInternal(minor, nameBuffer, name,
 451                                     EXPORT_NAME_FLAG_OID);
 452 }
 453
 454 #ifdef HAVE_GSS_C_NT_COMPOSITE_EXPORT
 455 static OM_uint32
 456 importCompositeExportName(OM_uint32 *minor,
 457                           const gss_buffer_t nameBuffer,
 458                           gss_name_t *name)
 459 {
 460     return gssEapImportNameInternal(minor, nameBuffer, name,
 461                                     EXPORT_NAME_FLAG_OID |
 462                                     EXPORT_NAME_FLAG_COMPOSITE);
 463 }
 464 #endif
 465
 466 struct gss_eap_name_import_provider {
 467     gss_const_OID oid;
 468     OM_uint32 (*import)(OM_uint32 *, const gss_buffer_t, gss_name_t *);
 469 };
 470
 471 OM_uint32
 472 gssEapImportName(OM_uint32 *minor,
 473                  const gss_buffer_t nameBuffer,
 474                  const gss_OID nameType,
 475                  const gss_OID mechType,
 476                  gss_name_t *pName)
 477 {
 478     struct gss_eap_name_import_provider nameTypes[] = {
 479         { GSS_EAP_NT_EAP_NAME,              importEapName               },
 480         { GSS_C_NT_USER_NAME,               importUserName              },
 481         { GSS_C_NT_HOSTBASED_SERVICE,       importServiceName           },
 482         { GSS_C_NT_HOSTBASED_SERVICE_X,     importServiceName           },
 483         { GSS_C_NT_ANONYMOUS,               importAnonymousName         },
 484         { GSS_C_NT_EXPORT_NAME,             importExportName            },
 485         { GSS_KRB5_NT_PRINCIPAL_NAME,       importUserName              },
 486 #ifdef HAVE_GSS_C_NT_COMPOSITE_EXPORT
 487         { GSS_C_NT_COMPOSITE_EXPORT,        importCompositeExportName   },
 488 #endif
 489     };
 490     size_t i;
 491     OM_uint32 major = GSS_S_BAD_NAMETYPE;
 492     OM_uint32 tmpMinor;
 493     gss_name_t name = GSS_C_NO_NAME;
 494
 495     for (i = 0; i < sizeof(nameTypes) / sizeof(nameTypes[0]); i++) {
 496         if (oidEqual(nameTypes[i].oid,
 497                      nameType == GSS_C_NO_OID ? GSS_EAP_NT_EAP_NAME : nameType)) {
 498             major = nameTypes[i].import(minor, nameBuffer, &name);
 499             break;
 500         }
 501     }
 502
 503     if (major == GSS_S_COMPLETE &&
 504         mechType != GSS_C_NO_OID) {
 505         assert(gssEapIsConcreteMechanismOid(mechType));
 506         assert(name->mechanismUsed == GSS_C_NO_OID);
 507
 508         major = gssEapCanonicalizeOid(minor, mechType, 0, &name->mechanismUsed);
 509     }
 510
 511     if (GSS_ERROR(major))
 512         gssEapReleaseName(&tmpMinor, &name);
 513     else
 514         *pName = name;
 515
 516     return major;
 517 }
 518
 519 OM_uint32
 520 gssEapExportName(OM_uint32 *minor,
 521                  const gss_name_t name,
 522                  gss_buffer_t exportedName)
 523 {
 524     return gssEapExportNameInternal(minor, name, exportedName,
 525                                     EXPORT_NAME_FLAG_OID);
 526 }
 527
 528 OM_uint32
 529 gssEapExportNameInternal(OM_uint32 *minor,
 530                          const gss_name_t name,
 531                          gss_buffer_t exportedName,
 532                          OM_uint32 flags)
 533 {
 534     OM_uint32 major = GSS_S_FAILURE, tmpMinor;
 535     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 536     size_t exportedNameLen;
 537     unsigned char *p;
 538     gss_buffer_desc attrs = GSS_C_EMPTY_BUFFER;
 539     gss_OID mech;
 540
 541     exportedName->length = 0;
 542     exportedName->value = NULL;
 543
 544     if (name->mechanismUsed != GSS_C_NO_OID)
 545         mech = name->mechanismUsed;
 546     else
 547         mech = GSS_EAP_MECHANISM;
 548
 549     major = gssEapDisplayName(minor, name, &nameBuf, NULL);
 550     if (GSS_ERROR(major))
 551         goto cleanup;
 552
 553     exportedNameLen = 0;
 554     if (flags & EXPORT_NAME_FLAG_OID) {
 555         exportedNameLen += 6 + mech->length;
 556     }
 557     exportedNameLen += 4 + nameBuf.length;
 558     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 559         major = gssEapExportAttrContext(minor, name, &attrs);
 560         if (GSS_ERROR(major))
 561             goto cleanup;
 562         exportedNameLen += attrs.length;
 563     }
 564
 565     exportedName->value = GSSEAP_MALLOC(exportedNameLen);
 566     if (exportedName->value == NULL) {
 567         major = GSS_S_FAILURE;
 568         *minor = ENOMEM;
 569         goto cleanup;
 570     }
 571     exportedName->length = exportedNameLen;
 572
 573     p = (unsigned char *)exportedName->value;
 574
 575     if (flags & EXPORT_NAME_FLAG_OID) {
 576         /* TOK | MECH_OID_LEN */
 577         store_uint16_be((flags & EXPORT_NAME_FLAG_COMPOSITE)
 578                         ? TOK_TYPE_EXPORT_NAME_COMPOSITE
 579                         : TOK_TYPE_EXPORT_NAME,
 580                         p);
 581         p += 2;
 582         store_uint16_be(mech->length + 2, p);
 583         p += 2;
 584
 585         /* MECH_OID */
 586         *p++ = 0x06;
 587         *p++ = mech->length & 0xff;
 588         memcpy(p, mech->elements, mech->length);
 589         p += mech->length;
 590     }
 591
 592     /* NAME_LEN */
 593     store_uint32_be(nameBuf.length, p);
 594     p += 4;
 595
 596     /* NAME */
 597     memcpy(p, nameBuf.value, nameBuf.length);
 598     p += nameBuf.length;
 599
 600     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 601         memcpy(p, attrs.value, attrs.length);
 602         p += attrs.length;
 603     }
 604
 605     assert(p == (unsigned char *)exportedName->value + exportedNameLen);
 606
 607     major = GSS_S_COMPLETE;
 608     *minor = 0;
 609
 610 cleanup:
 611     gss_release_buffer(&tmpMinor, &attrs);
 612     gss_release_buffer(&tmpMinor, &nameBuf);
 613     if (GSS_ERROR(major))
 614         gss_release_buffer(&tmpMinor, exportedName);
 615
 616     return major;
 617 }
 618
 619 OM_uint32
 620 gssEapCanonicalizeName(OM_uint32 *minor,
 621                        const gss_name_t input_name,
 622                        const gss_OID mech_type,
 623                        gss_name_t *dest_name)
 624 {
 625     OM_uint32 major, tmpMinor;
 626     krb5_context krbContext;
 627     gss_name_t name;
 628     gss_OID mech_used;
 629
 630     if (input_name == GSS_C_NO_NAME) {
 631         *minor = EINVAL;
 632         return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME;
 633     }
 634
 635     GSSEAP_KRB_INIT(&krbContext);
 636
 637     major = gssEapAllocName(minor, &name);
 638     if (GSS_ERROR(major)) {
 639         return major;
 640     }
 641
 642     if (mech_type != GSS_C_NO_OID)
 643         mech_used = mech_type;
 644     else
 645         mech_used = input_name->mechanismUsed;
 646
 647     major = gssEapCanonicalizeOid(minor,
 648                                   mech_used,
 649                                   OID_FLAG_NULL_VALID,
 650                                   &name->mechanismUsed);
 651     if (GSS_ERROR(major))
 652         goto cleanup;
 653
 654     name->flags = input_name->flags;
 655
 656     *minor = krb5_copy_principal(krbContext, input_name->krbPrincipal,
 657                                  &name->krbPrincipal);
 658     if (*minor != 0) {
 659         major = GSS_S_FAILURE;
 660         goto cleanup;
 661     }
 662
 663     if (input_name->attrCtx != NULL) {
 664         major = gssEapDuplicateAttrContext(minor, input_name, name);
 665         if (GSS_ERROR(major))
 666             goto cleanup;
 667     }
 668
 669     *dest_name = name;
 670
 671 cleanup:
 672     if (GSS_ERROR(major)) {
 673         gssEapReleaseName(&tmpMinor, &name);
 674     }
 675
 676     return major;
 677 }
 678
 679 OM_uint32
 680 gssEapDuplicateName(OM_uint32 *minor,
 681                     const gss_name_t input_name,
 682                     gss_name_t *dest_name)
 683 {
 684     return gssEapCanonicalizeName(minor, input_name,
 685                                   GSS_C_NO_OID, dest_name);
 686 }
 687
 688 OM_uint32
 689 gssEapDisplayName(OM_uint32 *minor,
 690                   gss_name_t name,
 691                   gss_buffer_t output_name_buffer,
 692                   gss_OID *output_name_type)
 693 {
 694     OM_uint32 major;
 695     krb5_context krbContext;
 696     char *krbName;
 697     gss_OID name_type;
 698     int flags = 0;
 699
 700     GSSEAP_KRB_INIT(&krbContext);
 701
 702     output_name_buffer->length = 0;
 703     output_name_buffer->value = NULL;
 704
 705     if (name == GSS_C_NO_NAME) {
 706         *minor = EINVAL;
 707         return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME;
 708     }
 709
 710     /*
 711      * According to draft-ietf-abfab-gss-eap-01, when the realm is
 712      * absent the trailing '@' is not included.
 713      */
 714 #ifdef HAVE_HEIMDAL_VERSION
 715     if (KRB_PRINC_REALM(name->krbPrincipal) == NULL ||
 716         KRB_PRINC_REALM(name->krbPrincipal)[0] == '\0')
 717 #else
 718     if (KRB_PRINC_REALM(name->krbPrincipal)->length == 0)
 719 #endif
 720         flags |= KRB5_PRINCIPAL_UNPARSE_NO_REALM;
 721
 722     *minor = krb5_unparse_name_flags(krbContext, name->krbPrincipal,
 723                                      flags, &krbName);
 724     if (*minor != 0) {
 725         return GSS_S_FAILURE;
 726     }
 727
 728     major = makeStringBuffer(minor, krbName, output_name_buffer);
 729     if (GSS_ERROR(major)) {
 730         krb5_free_unparsed_name(krbContext, krbName);
 731         return major;
 732     }
 733
 734     krb5_free_unparsed_name(krbContext, krbName);
 735
 736     if (output_name_buffer->length == 0) {
 737         name_type = GSS_C_NT_ANONYMOUS;
 738     } else if (name->flags & NAME_FLAG_NAI) {
 739         name_type = GSS_C_NT_USER_NAME;
 740     } else {
 741         name_type = GSS_EAP_NT_EAP_NAME;
 742     }
 743
 744     if (output_name_type != NULL)
 745         *output_name_type = name_type;
 746
 747     return GSS_S_COMPLETE;
 748 }
 749
 750 OM_uint32
 751 gssEapCompareName(OM_uint32 *minor,
 752                   gss_name_t name1,
 753                   gss_name_t name2,
 754                   int *name_equal)
 755 {
 756     krb5_context krbContext;
 757
 758     *minor = 0;
 759
 760     if (name1 == GSS_C_NO_NAME && name2 == GSS_C_NO_NAME) {
 761         *name_equal = 1;
 762     } else if (name1 != GSS_C_NO_NAME && name2 != GSS_C_NO_NAME) {
 763         GSSEAP_KRB_INIT(&krbContext);
 764
 765         /* krbPrincipal is immutable, so lock not required */
 766         *name_equal = krb5_principal_compare(krbContext,
 767                                              name1->krbPrincipal,
 768                                              name2->krbPrincipal);
 769     }
 770
 771     return GSS_S_COMPLETE;
 772 }