www.project-moonshot.org Git - mech_eap.orig/blob - util_name.c

   1 /*
   2  * Copyright (c) 2010, 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 gssEapNtPrincipalName = {
  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_PRINCIPAL_NAME = &gssEapNtPrincipalName;
  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
 115     gssEapReleaseAttrContext(&tmpMinor, name);
 116
 117     GSSEAP_MUTEX_DESTROY(&name->mutex);
 118     GSSEAP_FREE(name);
 119     *pName = NULL;
 120
 121     return GSS_S_COMPLETE;
 122 }
 123
 124 static OM_uint32
 125 krbPrincipalToName(OM_uint32 *minor,
 126                    krb5_principal *principal,
 127                    gss_name_t *pName)
 128 {
 129     OM_uint32 major;
 130     gss_name_t name;
 131
 132     major = gssEapAllocName(minor, &name);
 133     if (GSS_ERROR(major))
 134         return major;
 135
 136     name->krbPrincipal = *principal;
 137     *principal = NULL;
 138
 139     if (name->krbPrincipal->length > 1) {
 140         name->flags |= NAME_FLAG_SERVICE;
 141     } else {
 142         name->flags |= NAME_FLAG_NAI;
 143     }
 144
 145     *pName = name;
 146     *minor = 0;
 147
 148     return GSS_S_COMPLETE;
 149 }
 150
 151 static OM_uint32
 152 importServiceName(OM_uint32 *minor,
 153                   const gss_buffer_t nameBuffer,
 154                   gss_name_t *pName)
 155 {
 156     OM_uint32 major;
 157     krb5_context krbContext;
 158     krb5_principal krbPrinc;
 159     char *service, *host;
 160
 161     GSSEAP_KRB_INIT(&krbContext);
 162
 163     major = bufferToString(minor, nameBuffer, &service);
 164     if (GSS_ERROR(major))
 165         return major;
 166
 167     host = strchr(service, '@');
 168     if (host != NULL) {
 169         *host = '\0';
 170         host++;
 171     }
 172
 173     /* XXX this is probably NOT what we want to be doing */
 174     if (krb5_sname_to_principal(krbContext, host, service,
 175                                 KRB5_NT_SRV_HST, &krbPrinc) != 0) {
 176         GSSEAP_FREE(service);
 177         *minor = GSSEAP_BAD_SERVICE_NAME;
 178         return GSS_S_FAILURE;
 179     }
 180
 181     major = krbPrincipalToName(minor, &krbPrinc, pName);
 182     if (GSS_ERROR(major)) {
 183         krb5_free_principal(krbContext, krbPrinc);
 184     }
 185
 186     GSSEAP_FREE(service);
 187     return major;
 188 }
 189
 190 static OM_uint32
 191 importUserName(OM_uint32 *minor,
 192                const gss_buffer_t nameBuffer,
 193                gss_name_t *pName)
 194 {
 195     OM_uint32 major;
 196     krb5_context krbContext;
 197     krb5_principal krbPrinc;
 198     char *nameString;
 199
 200     GSSEAP_KRB_INIT(&krbContext);
 201
 202     if (nameBuffer == GSS_C_NO_BUFFER) {
 203         *minor = krb5_copy_principal(krbContext,
 204                                      krb5_anonymous_principal(), &krbPrinc);
 205         if (*minor != 0)
 206             return GSS_S_FAILURE;
 207     } else {
 208         major = bufferToString(minor, nameBuffer, &nameString);
 209         if (GSS_ERROR(major))
 210             return major;
 211
 212         *minor = krb5_parse_name(krbContext, nameString, &krbPrinc);
 213         if (*minor != 0) {
 214             GSSEAP_FREE(nameString);
 215             return GSS_S_FAILURE;
 216         }
 217     }
 218
 219     major = krbPrincipalToName(minor, &krbPrinc, pName);
 220     if (GSS_ERROR(major)) {
 221         krb5_free_principal(krbContext, krbPrinc);
 222     }
 223
 224     GSSEAP_FREE(nameString);
 225     return major;
 226 }
 227
 228 #define UPDATE_REMAIN(n)    do {            \
 229         p += (n);                           \
 230         remain -= (n);                      \
 231     } while (0)
 232
 233 #define CHECK_REMAIN(n)     do {        \
 234         if (remain < (n)) {             \
 235             major = GSS_S_BAD_NAME;     \
 236             *minor = GSSEAP_TOK_TRUNC;  \
 237             goto cleanup;               \
 238         }                               \
 239     } while (0)
 240
 241 OM_uint32
 242 gssEapImportNameInternal(OM_uint32 *minor,
 243                          const gss_buffer_t nameBuffer,
 244                          gss_name_t *pName,
 245                          unsigned int flags)
 246 {
 247     OM_uint32 major, tmpMinor;
 248     krb5_context krbContext;
 249     unsigned char *p;
 250     size_t len, remain;
 251     gss_buffer_desc buf;
 252     enum gss_eap_token_type tokType;
 253     gss_name_t name = GSS_C_NO_NAME;
 254
 255     GSSEAP_KRB_INIT(&krbContext);
 256
 257     p = (unsigned char *)nameBuffer->value;
 258     remain = nameBuffer->length;
 259
 260     if (flags & EXPORT_NAME_FLAG_OID) {
 261         if (remain < 6 + GSS_EAP_MECHANISM->length + 4)
 262             return GSS_S_BAD_NAME;
 263
 264         if (flags & EXPORT_NAME_FLAG_COMPOSITE)
 265             tokType = TOK_TYPE_EXPORT_NAME_COMPOSITE;
 266         else
 267             tokType = TOK_TYPE_EXPORT_NAME;
 268
 269         /* TOK_ID */
 270         if (load_uint16_be(p) != tokType)
 271             return GSS_S_BAD_NAME;
 272         UPDATE_REMAIN(2);
 273
 274         /* MECH_OID_LEN */
 275         len = load_uint16_be(p);
 276         if (len != 2 + GSS_EAP_MECHANISM->length)
 277             return GSS_S_BAD_NAME;
 278         UPDATE_REMAIN(2);
 279
 280         /* MECH_OID */
 281         if (p[0] != 0x06)
 282             return GSS_S_BAD_NAME;
 283         if (p[1] != GSS_EAP_MECHANISM->length)
 284             return GSS_S_BAD_MECH;
 285         if (memcmp(&p[2], GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length))
 286             return GSS_S_BAD_MECH;
 287         UPDATE_REMAIN(2 + GSS_EAP_MECHANISM->length);
 288     }
 289
 290     /* NAME_LEN */
 291     len = load_uint32_be(p);
 292     UPDATE_REMAIN(4);
 293
 294     /* NAME */
 295     CHECK_REMAIN(len);
 296     buf.length = len;
 297     buf.value = p;
 298     UPDATE_REMAIN(len);
 299
 300     major = importUserName(minor, &buf, &name);
 301     if (GSS_ERROR(major))
 302         goto cleanup;
 303
 304     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 305         gss_buffer_desc buf;
 306
 307         buf.length = remain;
 308         buf.value = p;
 309
 310         major = gssEapImportAttrContext(minor, &buf, name);
 311         if (GSS_ERROR(major))
 312             goto cleanup;
 313     }
 314
 315     major = GSS_S_COMPLETE;
 316     *minor = 0;
 317
 318 cleanup:
 319     if (GSS_ERROR(major))
 320         gssEapReleaseName(&tmpMinor, &name);
 321     else
 322         *pName = name;
 323
 324     return major;
 325 }
 326
 327 static OM_uint32
 328 importExportName(OM_uint32 *minor,
 329                  const gss_buffer_t nameBuffer,
 330                  gss_name_t *name)
 331 {
 332     return gssEapImportNameInternal(minor, nameBuffer, name,
 333                                     EXPORT_NAME_FLAG_OID);
 334 }
 335
 336 #ifdef HAVE_GSS_C_NT_COMPOSITE_EXPORT
 337 static OM_uint32
 338 importCompositeExportName(OM_uint32 *minor,
 339                           const gss_buffer_t nameBuffer,
 340                           gss_name_t *name)
 341 {
 342     return gssEapImportNameInternal(minor, nameBuffer, name,
 343                                     EXPORT_NAME_FLAG_OID |
 344                                     EXPORT_NAME_FLAG_COMPOSITE);
 345 }
 346 #endif
 347
 348 struct gss_eap_name_import_provider {
 349     gss_OID oid;
 350     OM_uint32 (*import)(OM_uint32 *, const gss_buffer_t, gss_name_t *);
 351 };
 352
 353 OM_uint32
 354 gssEapImportName(OM_uint32 *minor,
 355                  const gss_buffer_t nameBuffer,
 356                  gss_OID nameType,
 357                  gss_name_t *name)
 358 {
 359     struct gss_eap_name_import_provider nameTypes[] = {
 360         { GSS_C_NT_USER_NAME,               importUserName              },
 361         { GSS_EAP_NT_PRINCIPAL_NAME,        importUserName              },
 362         { GSS_C_NT_HOSTBASED_SERVICE,       importServiceName           },
 363         { GSS_C_NT_HOSTBASED_SERVICE_X,     importServiceName           },
 364         { GSS_C_NT_EXPORT_NAME,             importExportName            },
 365 #ifdef HAVE_GSS_C_NT_COMPOSITE_EXPORT
 366         { GSS_C_NT_COMPOSITE_EXPORT,        importCompositeExportName   },
 367 #endif
 368     };
 369     size_t i;
 370
 371     *name = GSS_C_NO_NAME;
 372
 373     if (nameType == GSS_C_NO_OID)
 374         nameType = nameTypes[0].oid;
 375
 376     for (i = 0; i < sizeof(nameTypes) / sizeof(nameTypes[0]); i++) {
 377         if (oidEqual(nameTypes[i].oid, nameType))
 378             return nameTypes[i].import(minor, nameBuffer, name);
 379     }
 380
 381     return GSS_S_BAD_NAMETYPE;
 382 }
 383
 384 OM_uint32
 385 gssEapExportName(OM_uint32 *minor,
 386                  const gss_name_t name,
 387                  gss_buffer_t exportedName)
 388 {
 389     return gssEapExportNameInternal(minor, name, exportedName,
 390                                     EXPORT_NAME_FLAG_OID);
 391 }
 392
 393 OM_uint32
 394 gssEapExportNameInternal(OM_uint32 *minor,
 395                          const gss_name_t name,
 396                          gss_buffer_t exportedName,
 397                          unsigned int flags)
 398 {
 399     OM_uint32 major = GSS_S_FAILURE, tmpMinor;
 400     krb5_context krbContext;
 401     char *krbName = NULL;
 402     size_t krbNameLen, exportedNameLen;
 403     unsigned char *p;
 404     gss_buffer_desc attrs = GSS_C_EMPTY_BUFFER;
 405
 406     exportedName->length = 0;
 407     exportedName->value = NULL;
 408
 409     GSSEAP_KRB_INIT(&krbContext);
 410
 411     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 412     if (*minor != 0) {
 413         major = GSS_S_FAILURE;
 414         goto cleanup;
 415     }
 416     krbNameLen = strlen(krbName);
 417
 418     exportedNameLen = 0;
 419     if (flags & EXPORT_NAME_FLAG_OID) {
 420         exportedNameLen += 6 + GSS_EAP_MECHANISM->length;
 421     }
 422     exportedNameLen += 4 + krbNameLen;
 423     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 424         major = gssEapExportAttrContext(minor, name, &attrs);
 425         if (GSS_ERROR(major))
 426             goto cleanup;
 427         exportedNameLen += attrs.length;
 428     }
 429
 430     exportedName->value = GSSEAP_MALLOC(exportedNameLen);
 431     if (exportedName->value == NULL) {
 432         major = GSS_S_FAILURE;
 433         *minor = ENOMEM;
 434         goto cleanup;
 435     }
 436     exportedName->length = exportedNameLen;
 437
 438     p = (unsigned char *)exportedName->value;
 439
 440     if (flags & EXPORT_NAME_FLAG_OID) {
 441         /* TOK | MECH_OID_LEN */
 442         store_uint16_be((flags & EXPORT_NAME_FLAG_COMPOSITE)
 443                         ? TOK_TYPE_EXPORT_NAME_COMPOSITE
 444                         : TOK_TYPE_EXPORT_NAME,
 445                         p);
 446         p += 2;
 447         store_uint16_be(GSS_EAP_MECHANISM->length + 2, p);
 448         p += 2;
 449
 450         /* MECH_OID */
 451         *p++ = 0x06;
 452         *p++ = GSS_EAP_MECHANISM->length & 0xff;
 453         memcpy(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length);
 454         p += GSS_EAP_MECHANISM->length;
 455     }
 456
 457     /* NAME_LEN */
 458     store_uint32_be(krbNameLen, p);
 459     p += 4;
 460
 461     /* NAME */
 462     memcpy(p, krbName, krbNameLen);
 463     p += krbNameLen;
 464
 465     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 466         memcpy(p, attrs.value, attrs.length);
 467         p += attrs.length;
 468     }
 469
 470     assert(p == (unsigned char *)exportedName->value + exportedNameLen);
 471
 472     major = GSS_S_COMPLETE;
 473     *minor = 0;
 474
 475 cleanup:
 476     gss_release_buffer(&tmpMinor, &attrs);
 477     if (GSS_ERROR(major))
 478         gss_release_buffer(&tmpMinor, exportedName);
 479     krb5_free_unparsed_name(krbContext, krbName);
 480
 481     return major;
 482 }
 483
 484 OM_uint32
 485 gssEapDuplicateName(OM_uint32 *minor,
 486                     const gss_name_t input_name,
 487                     gss_name_t *dest_name)
 488 {
 489     OM_uint32 major, tmpMinor;
 490     krb5_context krbContext;
 491     gss_name_t name;
 492
 493     if (input_name == GSS_C_NO_NAME) {
 494         *minor = EINVAL;
 495         return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME;
 496     }
 497
 498     GSSEAP_KRB_INIT(&krbContext);
 499
 500     major = gssEapAllocName(minor, &name);
 501     if (GSS_ERROR(major)) {
 502         return major;
 503     }
 504
 505     name->flags = input_name->flags;
 506
 507     *minor = krb5_copy_principal(krbContext, input_name->krbPrincipal,
 508                                  &name->krbPrincipal);
 509     if (*minor != 0) {
 510         major = GSS_S_FAILURE;
 511         goto cleanup;
 512     }
 513
 514     if (input_name->attrCtx != NULL) {
 515         major = gssEapDuplicateAttrContext(minor, input_name, name);
 516         if (GSS_ERROR(major))
 517             goto cleanup;
 518     }
 519
 520     *dest_name = name;
 521
 522 cleanup:
 523     if (GSS_ERROR(major)) {
 524         gssEapReleaseName(&tmpMinor, &name);
 525     }
 526
 527     return major;
 528 }
 529
 530 OM_uint32
 531 gssEapDisplayName(OM_uint32 *minor,
 532                   gss_name_t name,
 533                   gss_buffer_t output_name_buffer,
 534                   gss_OID *output_name_type)
 535 {
 536     OM_uint32 major;
 537     krb5_context krbContext;
 538     char *krbName;
 539
 540     GSSEAP_KRB_INIT(&krbContext);
 541
 542     output_name_buffer->length = 0;
 543     output_name_buffer->value = NULL;
 544
 545     if (name == GSS_C_NO_NAME) {
 546         *minor = EINVAL;
 547         return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME;
 548     }
 549
 550     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 551     if (*minor != 0) {
 552         return GSS_S_FAILURE;
 553     }
 554
 555     major = makeStringBuffer(minor, krbName, output_name_buffer);
 556     if (GSS_ERROR(major)) {
 557         krb5_free_unparsed_name(krbContext, krbName);
 558         return major;
 559     }
 560
 561     krb5_free_unparsed_name(krbContext, krbName);
 562
 563     if (output_name_type != NULL)
 564         *output_name_type = GSS_EAP_NT_PRINCIPAL_NAME;
 565
 566     return GSS_S_COMPLETE;
 567 }