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             *minor = GSSEAP_TOK_TRUNC;  \
 232             major = GSS_S_BAD_NAME;     \
 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
 313 cleanup:
 314     if (GSS_ERROR(major))
 315         gssEapReleaseName(&tmpMinor, &name);
 316     else
 317         *pName = name;
 318
 319     return major;
 320 }
 321
 322 static OM_uint32
 323 importExportName(OM_uint32 *minor,
 324                  const gss_buffer_t nameBuffer,
 325                  gss_name_t *name)
 326 {
 327     return gssEapImportNameInternal(minor, nameBuffer, name,
 328                                     EXPORT_NAME_FLAG_OID);
 329 }
 330
 331 #ifdef HAVE_GSS_C_NT_COMPOSITE_EXPORT
 332 static OM_uint32
 333 importCompositeExportName(OM_uint32 *minor,
 334                           const gss_buffer_t nameBuffer,
 335                           gss_name_t *name)
 336 {
 337     return gssEapImportNameInternal(minor, nameBuffer, name,
 338                                     EXPORT_NAME_FLAG_OID |
 339                                     EXPORT_NAME_FLAG_COMPOSITE);
 340 }
 341 #endif
 342
 343 struct gss_eap_name_import_provider {
 344     gss_OID oid;
 345     OM_uint32 (*import)(OM_uint32 *, const gss_buffer_t, gss_name_t *);
 346 };
 347
 348 OM_uint32
 349 gssEapImportName(OM_uint32 *minor,
 350                  const gss_buffer_t nameBuffer,
 351                  gss_OID nameType,
 352                  gss_name_t *name)
 353 {
 354     struct gss_eap_name_import_provider nameTypes[] = {
 355         { GSS_C_NT_USER_NAME,               importUserName              },
 356         { GSS_EAP_NT_PRINCIPAL_NAME,        importUserName              },
 357         { GSS_C_NT_HOSTBASED_SERVICE,       importServiceName           },
 358         { GSS_C_NT_HOSTBASED_SERVICE_X,     importServiceName           },
 359         { GSS_C_NT_EXPORT_NAME,             importExportName            },
 360 #ifdef HAVE_GSS_C_NT_COMPOSITE_EXPORT
 361         { GSS_C_NT_COMPOSITE_EXPORT,        importCompositeExportName   },
 362 #endif
 363     };
 364     size_t i;
 365
 366     *name = GSS_C_NO_NAME;
 367
 368     if (nameType == GSS_C_NO_OID)
 369         nameType = nameTypes[0].oid;
 370
 371     for (i = 0; i < sizeof(nameTypes) / sizeof(nameTypes[0]); i++) {
 372         if (oidEqual(nameTypes[i].oid, nameType))
 373             return nameTypes[i].import(minor, nameBuffer, name);
 374     }
 375
 376     return GSS_S_BAD_NAMETYPE;
 377 }
 378
 379 OM_uint32
 380 gssEapExportName(OM_uint32 *minor,
 381                  const gss_name_t name,
 382                  gss_buffer_t exportedName)
 383 {
 384     return gssEapExportNameInternal(minor, name, exportedName,
 385                                     EXPORT_NAME_FLAG_OID);
 386 }
 387
 388 OM_uint32
 389 gssEapExportNameInternal(OM_uint32 *minor,
 390                          const gss_name_t name,
 391                          gss_buffer_t exportedName,
 392                          unsigned int flags)
 393 {
 394     OM_uint32 major = GSS_S_FAILURE, tmpMinor;
 395     krb5_context krbContext;
 396     char *krbName = NULL;
 397     size_t krbNameLen, exportedNameLen;
 398     unsigned char *p;
 399     gss_buffer_desc attrs = GSS_C_EMPTY_BUFFER;
 400
 401     exportedName->length = 0;
 402     exportedName->value = NULL;
 403
 404     GSSEAP_KRB_INIT(&krbContext);
 405
 406     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 407     if (*minor != 0) {
 408         major = GSS_S_FAILURE;
 409         goto cleanup;
 410     }
 411     krbNameLen = strlen(krbName);
 412
 413     exportedNameLen = 0;
 414     if (flags & EXPORT_NAME_FLAG_OID) {
 415         exportedNameLen += 6 + GSS_EAP_MECHANISM->length;
 416     }
 417     exportedNameLen += 4 + krbNameLen;
 418     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 419         major = gssEapExportAttrContext(minor, name, &attrs);
 420         if (GSS_ERROR(major))
 421             goto cleanup;
 422         exportedNameLen += attrs.length;
 423     }
 424
 425     exportedName->value = GSSEAP_MALLOC(exportedNameLen);
 426     if (exportedName->value == NULL) {
 427         major = GSS_S_FAILURE;
 428         *minor = ENOMEM;
 429         goto cleanup;
 430     }
 431     exportedName->length = exportedNameLen;
 432
 433     p = (unsigned char *)exportedName->value;
 434
 435     if (flags & EXPORT_NAME_FLAG_OID) {
 436         /* TOK | MECH_OID_LEN */
 437         store_uint16_be((flags & EXPORT_NAME_FLAG_COMPOSITE)
 438                         ? TOK_TYPE_EXPORT_NAME_COMPOSITE
 439                         : TOK_TYPE_EXPORT_NAME,
 440                         p);
 441         p += 2;
 442         store_uint16_be(GSS_EAP_MECHANISM->length + 2, p);
 443         p += 2;
 444
 445         /* MECH_OID */
 446         *p++ = 0x06;
 447         *p++ = GSS_EAP_MECHANISM->length & 0xff;
 448         memcpy(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length);
 449         p += GSS_EAP_MECHANISM->length;
 450     }
 451
 452     /* NAME_LEN */
 453     store_uint32_be(krbNameLen, p);
 454     p += 4;
 455
 456     /* NAME */
 457     memcpy(p, krbName, krbNameLen);
 458     p += krbNameLen;
 459
 460     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 461         memcpy(p, attrs.value, attrs.length);
 462         p += attrs.length;
 463     }
 464
 465     assert(p == (unsigned char *)exportedName->value + exportedNameLen);
 466
 467     *minor = 0;
 468     major = GSS_S_COMPLETE;
 469
 470 cleanup:
 471     gss_release_buffer(&tmpMinor, &attrs);
 472     if (GSS_ERROR(major))
 473         gss_release_buffer(&tmpMinor, exportedName);
 474     krb5_free_unparsed_name(krbContext, krbName);
 475
 476     return major;
 477 }
 478
 479 OM_uint32
 480 gssEapDuplicateName(OM_uint32 *minor,
 481                     const gss_name_t input_name,
 482                     gss_name_t *dest_name)
 483 {
 484     OM_uint32 major, tmpMinor;
 485     krb5_context krbContext;
 486     gss_name_t name;
 487
 488     if (input_name == GSS_C_NO_NAME) {
 489         *minor = EINVAL;
 490         return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME;
 491     }
 492
 493     GSSEAP_KRB_INIT(&krbContext);
 494
 495     major = gssEapAllocName(minor, &name);
 496     if (GSS_ERROR(major)) {
 497         return major;
 498     }
 499
 500     *minor = krb5_copy_principal(krbContext, input_name->krbPrincipal,
 501                                  &name->krbPrincipal);
 502     if (*minor != 0) {
 503         major = GSS_S_FAILURE;
 504         goto cleanup;
 505     }
 506
 507     if (input_name->attrCtx != NULL) {
 508         major = gssEapDuplicateAttrContext(minor, input_name, name);
 509         if (GSS_ERROR(major))
 510             goto cleanup;
 511     }
 512
 513     *dest_name = name;
 514
 515 cleanup:
 516     if (GSS_ERROR(major)) {
 517         gssEapReleaseName(&tmpMinor, &name);
 518     }
 519
 520     return major;
 521 }
 522
 523 OM_uint32
 524 gssEapDisplayName(OM_uint32 *minor,
 525                   gss_name_t name,
 526                   gss_buffer_t output_name_buffer,
 527                   gss_OID *output_name_type)
 528 {
 529     OM_uint32 major;
 530     krb5_context krbContext;
 531     char *krbName;
 532
 533     GSSEAP_KRB_INIT(&krbContext);
 534
 535     output_name_buffer->length = 0;
 536     output_name_buffer->value = NULL;
 537
 538     if (name == GSS_C_NO_NAME) {
 539         *minor = EINVAL;
 540         return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME;
 541     }
 542
 543     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 544     if (*minor != 0) {
 545         return GSS_S_FAILURE;
 546     }
 547
 548     major = makeStringBuffer(minor, krbName, output_name_buffer);
 549     if (GSS_ERROR(major)) {
 550         krb5_free_unparsed_name(krbContext, krbName);
 551         return major;
 552     }
 553
 554     krb5_free_unparsed_name(krbContext, krbName);
 555
 556     if (output_name_type != NULL)
 557         *output_name_type = GSS_EAP_NT_PRINCIPAL_NAME;
 558
 559     return GSS_S_COMPLETE;
 560 }