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 #include "gssapiP_eap.h"
  57
  58 static gss_OID_desc gssEapNtPrincipalName = {
  59     /* 1.3.6.1.4.1.5322.22.2.1  */
  60     10, "\x2B\x06\x01\x04\x01\xA9\x4A\x16\x02\x01"
  61 };
  62
  63 gss_OID GSS_EAP_NT_PRINCIPAL_NAME = &gssEapNtPrincipalName;
  64
  65 OM_uint32
  66 gssEapAllocName(OM_uint32 *minor, gss_name_t *pName)
  67 {
  68     OM_uint32 tmpMinor;
  69     gss_name_t name;
  70
  71     *pName = GSS_C_NO_NAME;
  72
  73     name = (gss_name_t)GSSEAP_CALLOC(1, sizeof(*name));
  74     if (name == NULL) {
  75         *minor = ENOMEM;
  76         return GSS_S_FAILURE;
  77     }
  78
  79     if (GSSEAP_MUTEX_INIT(&name->mutex) != 0) {
  80         *minor = errno;
  81         gssEapReleaseName(&tmpMinor, &name);
  82         return GSS_S_FAILURE;
  83     }
  84
  85     *pName = name;
  86
  87     return GSS_S_COMPLETE;
  88 }
  89
  90 OM_uint32
  91 gssEapReleaseName(OM_uint32 *minor, gss_name_t *pName)
  92 {
  93     gss_name_t name;
  94     krb5_context krbContext = NULL;
  95     OM_uint32 tmpMinor;
  96
  97     *minor = 0;
  98
  99     if (pName == NULL) {
 100         return GSS_S_COMPLETE;
 101     }
 102
 103     name = *pName;
 104     if (name == GSS_C_NO_NAME) {
 105         return GSS_S_COMPLETE;
 106     }
 107
 108     GSSEAP_KRB_INIT(&krbContext);
 109     krb5_free_principal(krbContext, name->krbPrincipal);
 110
 111     gssEapReleaseAttrContext(&tmpMinor, name);
 112
 113     GSSEAP_MUTEX_DESTROY(&name->mutex);
 114     GSSEAP_FREE(name);
 115     *pName = NULL;
 116
 117     return GSS_S_COMPLETE;
 118 }
 119
 120 static OM_uint32
 121 krbPrincipalToName(OM_uint32 *minor,
 122                    krb5_principal *principal,
 123                    gss_name_t *pName)
 124 {
 125     OM_uint32 major;
 126     gss_name_t name;
 127
 128     major = gssEapAllocName(minor, &name);
 129     if (GSS_ERROR(major))
 130         return major;
 131
 132     name->krbPrincipal = *principal;
 133     *principal = NULL;
 134
 135     if (name->krbPrincipal->length > 1) {
 136         name->flags |= NAME_FLAG_SERVICE;
 137     } else {
 138         name->flags |= NAME_FLAG_NAI;
 139     }
 140
 141     *pName = name;
 142     *minor = 0;
 143
 144     return GSS_S_COMPLETE;
 145 }
 146
 147 static OM_uint32
 148 importServiceName(OM_uint32 *minor,
 149                   const gss_buffer_t nameBuffer,
 150                   gss_name_t *pName)
 151 {
 152     OM_uint32 major;
 153     krb5_context krbContext;
 154     krb5_principal krbPrinc;
 155     char *service, *host;
 156
 157     GSSEAP_KRB_INIT(&krbContext);
 158
 159     major = bufferToString(minor, nameBuffer, &service);
 160     if (GSS_ERROR(major))
 161         return major;
 162
 163     host = strchr(service, '@');
 164     if (host != NULL) {
 165         *host = '\0';
 166         host++;
 167     }
 168
 169     /* XXX this is probably NOT what we want to be doing */
 170     if (krb5_sname_to_principal(krbContext, host, service,
 171                                 KRB5_NT_SRV_HST, &krbPrinc) != 0) {
 172         GSSEAP_FREE(service);
 173         *minor = GSSEAP_BAD_SERVICE_NAME;
 174         return GSS_S_FAILURE;
 175     }
 176
 177     major = krbPrincipalToName(minor, &krbPrinc, pName);
 178     if (GSS_ERROR(major)) {
 179         krb5_free_principal(krbContext, krbPrinc);
 180     }
 181
 182     GSSEAP_FREE(service);
 183     return major;
 184 }
 185
 186 static OM_uint32
 187 importUserName(OM_uint32 *minor,
 188                const gss_buffer_t nameBuffer,
 189                gss_name_t *pName)
 190 {
 191     OM_uint32 major;
 192     krb5_context krbContext;
 193     krb5_principal krbPrinc;
 194     char *nameString;
 195
 196     GSSEAP_KRB_INIT(&krbContext);
 197
 198     if (nameBuffer == GSS_C_NO_BUFFER) {
 199         *minor = krb5_copy_principal(krbContext,
 200                                      krb5_anonymous_principal(), &krbPrinc);
 201         if (*minor != 0)
 202             return GSS_S_FAILURE;
 203     } else {
 204         major = bufferToString(minor, nameBuffer, &nameString);
 205         if (GSS_ERROR(major))
 206             return major;
 207
 208         *minor = krb5_parse_name(krbContext, nameString, &krbPrinc);
 209         if (*minor != 0) {
 210             GSSEAP_FREE(nameString);
 211             return GSS_S_FAILURE;
 212         }
 213     }
 214
 215     major = krbPrincipalToName(minor, &krbPrinc, pName);
 216     if (GSS_ERROR(major)) {
 217         krb5_free_principal(krbContext, krbPrinc);
 218     }
 219
 220     GSSEAP_FREE(nameString);
 221     return major;
 222 }
 223
 224 #define UPDATE_REMAIN(n)    do {            \
 225         p += (n);                           \
 226         remain -= (n);                      \
 227     } while (0)
 228
 229 #define CHECK_REMAIN(n)     do {        \
 230         if (remain < (n)) {             \
 231             major = GSS_S_BAD_NAME;     \
 232             *minor = GSSEAP_TOK_TRUNC;  \
 233             goto cleanup;               \
 234         }                               \
 235     } while (0)
 236
 237 OM_uint32
 238 gssEapImportNameInternal(OM_uint32 *minor,
 239                          const gss_buffer_t nameBuffer,
 240                          gss_name_t *pName,
 241                          unsigned int flags)
 242 {
 243     OM_uint32 major, tmpMinor;
 244     krb5_context krbContext;
 245     unsigned char *p;
 246     size_t len, remain;
 247     gss_buffer_desc buf;
 248     enum gss_eap_token_type tokType;
 249     gss_name_t name = GSS_C_NO_NAME;
 250
 251     GSSEAP_KRB_INIT(&krbContext);
 252
 253     p = (unsigned char *)nameBuffer->value;
 254     remain = nameBuffer->length;
 255
 256     if (flags & EXPORT_NAME_FLAG_OID) {
 257         if (remain < 6 + GSS_EAP_MECHANISM->length + 4)
 258             return GSS_S_BAD_NAME;
 259
 260         if (flags & EXPORT_NAME_FLAG_COMPOSITE)
 261             tokType = TOK_TYPE_EXPORT_NAME_COMPOSITE;
 262         else
 263             tokType = TOK_TYPE_EXPORT_NAME;
 264
 265         /* TOK_ID */
 266         if (load_uint16_be(p) != tokType)
 267             return GSS_S_BAD_NAME;
 268         UPDATE_REMAIN(2);
 269
 270         /* MECH_OID_LEN */
 271         len = load_uint16_be(p);
 272         if (len != 2 + GSS_EAP_MECHANISM->length)
 273             return GSS_S_BAD_NAME;
 274         UPDATE_REMAIN(2);
 275
 276         /* MECH_OID */
 277         if (p[0] != 0x06)
 278             return GSS_S_BAD_NAME;
 279         if (p[1] != GSS_EAP_MECHANISM->length)
 280             return GSS_S_BAD_MECH;
 281         if (memcmp(&p[2], GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length))
 282             return GSS_S_BAD_MECH;
 283         UPDATE_REMAIN(2 + GSS_EAP_MECHANISM->length);
 284     }
 285
 286     /* NAME_LEN */
 287     len = load_uint32_be(p);
 288     UPDATE_REMAIN(4);
 289
 290     /* NAME */
 291     CHECK_REMAIN(len);
 292     buf.length = len;
 293     buf.value = p;
 294     UPDATE_REMAIN(len);
 295
 296     major = importUserName(minor, &buf, &name);
 297     if (GSS_ERROR(major))
 298         goto cleanup;
 299
 300     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 301         gss_buffer_desc buf;
 302
 303         buf.length = remain;
 304         buf.value = p;
 305
 306         major = gssEapImportAttrContext(minor, &buf, name);
 307         if (GSS_ERROR(major))
 308             goto cleanup;
 309     }
 310
 311     major = GSS_S_COMPLETE;
 312     *minor = 0;
 313
 314 cleanup:
 315     if (GSS_ERROR(major))
 316         gssEapReleaseName(&tmpMinor, &name);
 317     else
 318         *pName = name;
 319
 320     return major;
 321 }
 322
 323 static OM_uint32
 324 importExportName(OM_uint32 *minor,
 325                  const gss_buffer_t nameBuffer,
 326                  gss_name_t *name)
 327 {
 328     return gssEapImportNameInternal(minor, nameBuffer, name,
 329                                     EXPORT_NAME_FLAG_OID);
 330 }
 331
 332 #ifdef HAVE_GSS_C_NT_COMPOSITE_EXPORT
 333 static OM_uint32
 334 importCompositeExportName(OM_uint32 *minor,
 335                           const gss_buffer_t nameBuffer,
 336                           gss_name_t *name)
 337 {
 338     return gssEapImportNameInternal(minor, nameBuffer, name,
 339                                     EXPORT_NAME_FLAG_OID |
 340                                     EXPORT_NAME_FLAG_COMPOSITE);
 341 }
 342 #endif
 343
 344 struct gss_eap_name_import_provider {
 345     gss_OID oid;
 346     OM_uint32 (*import)(OM_uint32 *, const gss_buffer_t, gss_name_t *);
 347 };
 348
 349 OM_uint32
 350 gssEapImportName(OM_uint32 *minor,
 351                  const gss_buffer_t nameBuffer,
 352                  gss_OID nameType,
 353                  gss_name_t *name)
 354 {
 355     struct gss_eap_name_import_provider nameTypes[] = {
 356         { GSS_C_NT_USER_NAME,               importUserName              },
 357         { GSS_EAP_NT_PRINCIPAL_NAME,        importUserName              },
 358         { GSS_C_NT_HOSTBASED_SERVICE,       importServiceName           },
 359         { GSS_C_NT_HOSTBASED_SERVICE_X,     importServiceName           },
 360         { GSS_C_NT_EXPORT_NAME,             importExportName            },
 361 #ifdef HAVE_GSS_C_NT_COMPOSITE_EXPORT
 362         { GSS_C_NT_COMPOSITE_EXPORT,        importCompositeExportName   },
 363 #endif
 364     };
 365     size_t i;
 366
 367     *name = GSS_C_NO_NAME;
 368
 369     if (nameType == GSS_C_NO_OID)
 370         nameType = nameTypes[0].oid;
 371
 372     for (i = 0; i < sizeof(nameTypes) / sizeof(nameTypes[0]); i++) {
 373         if (oidEqual(nameTypes[i].oid, nameType))
 374             return nameTypes[i].import(minor, nameBuffer, name);
 375     }
 376
 377     return GSS_S_BAD_NAMETYPE;
 378 }
 379
 380 OM_uint32
 381 gssEapExportName(OM_uint32 *minor,
 382                  const gss_name_t name,
 383                  gss_buffer_t exportedName)
 384 {
 385     return gssEapExportNameInternal(minor, name, exportedName,
 386                                     EXPORT_NAME_FLAG_OID);
 387 }
 388
 389 OM_uint32
 390 gssEapExportNameInternal(OM_uint32 *minor,
 391                          const gss_name_t name,
 392                          gss_buffer_t exportedName,
 393                          unsigned int flags)
 394 {
 395     OM_uint32 major = GSS_S_FAILURE, tmpMinor;
 396     krb5_context krbContext;
 397     char *krbName = NULL;
 398     size_t krbNameLen, exportedNameLen;
 399     unsigned char *p;
 400     gss_buffer_desc attrs = GSS_C_EMPTY_BUFFER;
 401
 402     exportedName->length = 0;
 403     exportedName->value = NULL;
 404
 405     GSSEAP_KRB_INIT(&krbContext);
 406
 407     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 408     if (*minor != 0) {
 409         major = GSS_S_FAILURE;
 410         goto cleanup;
 411     }
 412     krbNameLen = strlen(krbName);
 413
 414     exportedNameLen = 0;
 415     if (flags & EXPORT_NAME_FLAG_OID) {
 416         exportedNameLen += 6 + GSS_EAP_MECHANISM->length;
 417     }
 418     exportedNameLen += 4 + krbNameLen;
 419     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 420         major = gssEapExportAttrContext(minor, name, &attrs);
 421         if (GSS_ERROR(major))
 422             goto cleanup;
 423         exportedNameLen += attrs.length;
 424     }
 425
 426     exportedName->value = GSSEAP_MALLOC(exportedNameLen);
 427     if (exportedName->value == NULL) {
 428         major = GSS_S_FAILURE;
 429         *minor = ENOMEM;
 430         goto cleanup;
 431     }
 432     exportedName->length = exportedNameLen;
 433
 434     p = (unsigned char *)exportedName->value;
 435
 436     if (flags & EXPORT_NAME_FLAG_OID) {
 437         /* TOK | MECH_OID_LEN */
 438         store_uint16_be((flags & EXPORT_NAME_FLAG_COMPOSITE)
 439                         ? TOK_TYPE_EXPORT_NAME_COMPOSITE
 440                         : TOK_TYPE_EXPORT_NAME,
 441                         p);
 442         p += 2;
 443         store_uint16_be(GSS_EAP_MECHANISM->length + 2, p);
 444         p += 2;
 445
 446         /* MECH_OID */
 447         *p++ = 0x06;
 448         *p++ = GSS_EAP_MECHANISM->length & 0xff;
 449         memcpy(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length);
 450         p += GSS_EAP_MECHANISM->length;
 451     }
 452
 453     /* NAME_LEN */
 454     store_uint32_be(krbNameLen, p);
 455     p += 4;
 456
 457     /* NAME */
 458     memcpy(p, krbName, krbNameLen);
 459     p += krbNameLen;
 460
 461     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 462         memcpy(p, attrs.value, attrs.length);
 463         p += attrs.length;
 464     }
 465
 466     assert(p == (unsigned char *)exportedName->value + exportedNameLen);
 467
 468     major = GSS_S_COMPLETE;
 469     *minor = 0;
 470
 471 cleanup:
 472     gss_release_buffer(&tmpMinor, &attrs);
 473     if (GSS_ERROR(major))
 474         gss_release_buffer(&tmpMinor, exportedName);
 475     krb5_free_unparsed_name(krbContext, krbName);
 476
 477     return major;
 478 }
 479
 480 OM_uint32
 481 gssEapDuplicateName(OM_uint32 *minor,
 482                     const gss_name_t input_name,
 483                     gss_name_t *dest_name)
 484 {
 485     OM_uint32 major, tmpMinor;
 486     krb5_context krbContext;
 487     gss_name_t name;
 488
 489     if (input_name == GSS_C_NO_NAME) {
 490         *minor = EINVAL;
 491         return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME;
 492     }
 493
 494     GSSEAP_KRB_INIT(&krbContext);
 495
 496     major = gssEapAllocName(minor, &name);
 497     if (GSS_ERROR(major)) {
 498         return major;
 499     }
 500
 501     name->flags = input_name->flags;
 502
 503     *minor = krb5_copy_principal(krbContext, input_name->krbPrincipal,
 504                                  &name->krbPrincipal);
 505     if (*minor != 0) {
 506         major = GSS_S_FAILURE;
 507         goto cleanup;
 508     }
 509
 510     if (input_name->attrCtx != NULL) {
 511         major = gssEapDuplicateAttrContext(minor, input_name, name);
 512         if (GSS_ERROR(major))
 513             goto cleanup;
 514     }
 515
 516     *dest_name = name;
 517
 518 cleanup:
 519     if (GSS_ERROR(major)) {
 520         gssEapReleaseName(&tmpMinor, &name);
 521     }
 522
 523     return major;
 524 }
 525
 526 OM_uint32
 527 gssEapDisplayName(OM_uint32 *minor,
 528                   gss_name_t name,
 529                   gss_buffer_t output_name_buffer,
 530                   gss_OID *output_name_type)
 531 {
 532     OM_uint32 major;
 533     krb5_context krbContext;
 534     char *krbName;
 535
 536     GSSEAP_KRB_INIT(&krbContext);
 537
 538     output_name_buffer->length = 0;
 539     output_name_buffer->value = NULL;
 540
 541     if (name == GSS_C_NO_NAME) {
 542         *minor = EINVAL;
 543         return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME;
 544     }
 545
 546     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 547     if (*minor != 0) {
 548         return GSS_S_FAILURE;
 549     }
 550
 551     major = makeStringBuffer(minor, krbName, output_name_buffer);
 552     if (GSS_ERROR(major)) {
 553         krb5_free_unparsed_name(krbContext, krbName);
 554         return major;
 555     }
 556
 557     krb5_free_unparsed_name(krbContext, krbName);
 558
 559     if (output_name_type != NULL)
 560         *output_name_type = GSS_EAP_NT_PRINCIPAL_NAME;
 561
 562     return GSS_S_COMPLETE;
 563 }