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     /* 1.3.6.1.4.1.5322.21.2.1  */
  60     10, "\x2B\x06\x01\x04\x01\xA9\x4A\x15\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     if (pName == NULL) {
  98         return GSS_S_COMPLETE;
  99     }
 100
 101     name = *pName;
 102     if (name == GSS_C_NO_NAME) {
 103         return GSS_S_COMPLETE;
 104     }
 105
 106     GSSEAP_KRB_INIT(&krbContext);
 107     krb5_free_principal(krbContext, name->krbPrincipal);
 108
 109     gssEapReleaseAttrContext(&tmpMinor, name);
 110
 111     GSSEAP_MUTEX_DESTROY(&name->mutex);
 112     GSSEAP_FREE(name);
 113     *pName = NULL;
 114
 115     *minor = 0;
 116     return GSS_S_COMPLETE;
 117 }
 118
 119 static OM_uint32
 120 krbPrincipalToName(OM_uint32 *minor,
 121                    krb5_principal *principal,
 122                    gss_name_t *pName)
 123 {
 124     OM_uint32 major;
 125     gss_name_t name;
 126
 127     major = gssEapAllocName(minor, &name);
 128     if (GSS_ERROR(major))
 129         return major;
 130
 131     name->krbPrincipal = *principal;
 132     *principal = NULL;
 133
 134     if (name->krbPrincipal->length == 1) {
 135         name->flags |= NAME_FLAG_NAI;
 136     } else {
 137         name->flags |= NAME_FLAG_SERVICE;
 138     }
 139
 140     *pName = name;
 141     *minor = 0;
 142
 143     return GSS_S_COMPLETE;
 144 }
 145
 146 static OM_uint32
 147 importServiceName(OM_uint32 *minor,
 148                   const gss_buffer_t nameBuffer,
 149                   gss_name_t *pName)
 150 {
 151     OM_uint32 major;
 152     krb5_context krbContext;
 153     krb5_principal krbPrinc;
 154     char *service, *host;
 155
 156     GSSEAP_KRB_INIT(&krbContext);
 157
 158     major = bufferToString(minor, nameBuffer, &service);
 159     if (GSS_ERROR(major))
 160         return major;
 161
 162     host = strchr(service, '@');
 163     if (host != NULL) {
 164         *host = '\0';
 165         host++;
 166     }
 167
 168     /* XXX this is probably NOT what we want to be doing */
 169     *minor = krb5_sname_to_principal(krbContext, host, service,
 170                                      KRB5_NT_SRV_HST, &krbPrinc);
 171     if (*minor != 0) {
 172         GSSEAP_FREE(service);
 173         return GSS_S_FAILURE;
 174     }
 175
 176     major = krbPrincipalToName(minor, &krbPrinc, pName);
 177     if (GSS_ERROR(major)) {
 178         krb5_free_principal(krbContext, krbPrinc);
 179     }
 180
 181     GSSEAP_FREE(service);
 182     return major;
 183 }
 184
 185 static OM_uint32
 186 importUserName(OM_uint32 *minor,
 187                const gss_buffer_t nameBuffer,
 188                gss_name_t *pName)
 189 {
 190     OM_uint32 major;
 191     krb5_context krbContext;
 192     krb5_principal krbPrinc;
 193     char *nameString;
 194
 195     GSSEAP_KRB_INIT(&krbContext);
 196
 197     major = bufferToString(minor, nameBuffer, &nameString);
 198     if (GSS_ERROR(major))
 199         return major;
 200
 201     *minor = krb5_parse_name(krbContext, nameString, &krbPrinc);
 202     if (*minor != 0) {
 203         GSSEAP_FREE(nameString);
 204         return GSS_S_FAILURE;
 205     }
 206
 207     major = krbPrincipalToName(minor, &krbPrinc, pName);
 208     if (GSS_ERROR(major)) {
 209         krb5_free_principal(krbContext, krbPrinc);
 210     }
 211
 212     GSSEAP_FREE(nameString);
 213     return major;
 214 }
 215
 216 #define UPDATE_REMAIN(n)    do {            \
 217         p += (n);                           \
 218         remain -= (n);                      \
 219     } while (0)
 220
 221 #define CHECK_REMAIN(n)     do {        \
 222         if (remain < (n)) {             \
 223             *minor = ERANGE;            \
 224             major = GSS_S_BAD_NAME;     \
 225             goto cleanup;               \
 226         }                               \
 227     } while (0)
 228
 229 OM_uint32
 230 gssEapImportNameInternal(OM_uint32 *minor,
 231                          const gss_buffer_t nameBuffer,
 232                          gss_name_t *pName,
 233                          unsigned int flags)
 234 {
 235     OM_uint32 major, tmpMinor;
 236     krb5_context krbContext;
 237     unsigned char *p;
 238     size_t len, remain;
 239     gss_buffer_desc buf;
 240     enum gss_eap_token_type tokType;
 241     gss_name_t name = GSS_C_NO_NAME;
 242
 243     GSSEAP_KRB_INIT(&krbContext);
 244
 245     p = (unsigned char *)nameBuffer->value;
 246     remain = nameBuffer->length;
 247
 248     if (flags & EXPORT_NAME_FLAG_OID) {
 249         if (remain < 6 + GSS_EAP_MECHANISM->length + 4)
 250             return GSS_S_BAD_NAME;
 251
 252         if (flags & EXPORT_NAME_FLAG_COMPOSITE)
 253             tokType = TOK_TYPE_EXPORT_NAME_COMPOSITE;
 254         else
 255             tokType = TOK_TYPE_EXPORT_NAME;
 256
 257         /* TOK_ID */
 258         if (load_uint16_be(p) != tokType)
 259             return GSS_S_BAD_NAME;
 260         UPDATE_REMAIN(2);
 261
 262         /* MECH_OID_LEN */
 263         len = load_uint16_be(p);
 264         if (len != 2 + GSS_EAP_MECHANISM->length)
 265             return GSS_S_BAD_NAME;
 266         UPDATE_REMAIN(2);
 267
 268         /* MECH_OID */
 269         if (p[0] != 0x06)
 270             return GSS_S_BAD_NAME;
 271         if (p[1] != GSS_EAP_MECHANISM->length)
 272             return GSS_S_BAD_MECH;
 273         if (memcmp(&p[2], GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length))
 274             return GSS_S_BAD_MECH;
 275         UPDATE_REMAIN(2 + GSS_EAP_MECHANISM->length);
 276     }
 277
 278     /* NAME_LEN */
 279     len = load_uint32_be(p);
 280     UPDATE_REMAIN(4);
 281
 282     /* NAME */
 283     CHECK_REMAIN(len);
 284     buf.length = len;
 285     buf.value = p;
 286     UPDATE_REMAIN(len);
 287
 288     major = importUserName(minor, &buf, &name);
 289     if (GSS_ERROR(major))
 290         goto cleanup;
 291
 292     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 293         gss_buffer_desc buf;
 294
 295         CHECK_REMAIN(4);
 296         buf.length = load_uint32_be(p);
 297         UPDATE_REMAIN(4);
 298
 299         CHECK_REMAIN(buf.length);
 300         buf.value = p;
 301         UPDATE_REMAIN(buf.length);
 302
 303         major = gssEapImportAttrContext(minor, &buf, name);
 304         if (GSS_ERROR(major))
 305             goto cleanup;
 306     }
 307
 308     major = GSS_S_COMPLETE;
 309
 310 cleanup:
 311     if (GSS_ERROR(major))
 312         gssEapReleaseName(&tmpMinor, &name);
 313     else
 314         *pName = name;
 315
 316     return major;
 317 }
 318
 319 OM_uint32
 320 gssEapImportName(OM_uint32 *minor,
 321                  const gss_buffer_t nameBuffer,
 322                  gss_OID nameType,
 323                  gss_name_t *name)
 324 {
 325     OM_uint32 major, tmpMinor;
 326
 327     *name = GSS_C_NO_NAME;
 328
 329     if (nameType == GSS_C_NULL_OID ||
 330         oidEqual(nameType, GSS_C_NT_USER_NAME) ||
 331         oidEqual(nameType, GSS_EAP_NT_PRINCIPAL_NAME))
 332         major = importUserName(minor, nameBuffer, name);
 333     else if (oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE) ||
 334                oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE_X))
 335         major = importServiceName(minor, nameBuffer, name);
 336     else if (oidEqual(nameType, GSS_C_NT_EXPORT_NAME))
 337         major = gssEapImportNameInternal(minor, nameBuffer, name,
 338                                          EXPORT_NAME_FLAG_OID);
 339 #ifdef HAVE_GSS_C_NT_COMPOSITE_EXPORT
 340     else if (oidEqual(nameType, GSS_C_NT_COMPOSITE_EXPORT))
 341         major = gssEapImportNameInternal(minor, nameBuffer, name,
 342                                          EXPORT_NAME_FLAG_OID |
 343                                          EXPORT_NAME_FLAG_COMPOSITE);
 344 #endif
 345     else
 346         major = GSS_S_BAD_NAMETYPE;
 347
 348     if (GSS_ERROR(major))
 349         gssEapReleaseName(&tmpMinor, name);
 350
 351     return major;
 352 }
 353
 354 OM_uint32
 355 gssEapExportName(OM_uint32 *minor,
 356                  const gss_name_t name,
 357                  gss_buffer_t exportedName)
 358 {
 359     return gssEapExportNameInternal(minor, name, exportedName,
 360                                     EXPORT_NAME_FLAG_OID);
 361 }
 362
 363 OM_uint32
 364 gssEapExportNameInternal(OM_uint32 *minor,
 365                          const gss_name_t name,
 366                          gss_buffer_t exportedName,
 367                          unsigned int flags)
 368 {
 369     OM_uint32 major = GSS_S_FAILURE, tmpMinor;
 370     krb5_context krbContext;
 371     char *krbName = NULL;
 372     size_t krbNameLen, exportedNameLen;
 373     unsigned char *p;
 374     gss_buffer_desc attrs = GSS_C_EMPTY_BUFFER;
 375
 376     exportedName->length = 0;
 377     exportedName->value = NULL;
 378
 379     GSSEAP_KRB_INIT(&krbContext);
 380     GSSEAP_MUTEX_LOCK(&name->mutex);
 381
 382     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 383     if (*minor != 0) {
 384         major = GSS_S_FAILURE;
 385         goto cleanup;
 386     }
 387     krbNameLen = strlen(krbName);
 388
 389     exportedNameLen = 0;
 390     if (flags & EXPORT_NAME_FLAG_OID) {
 391         exportedNameLen += 6 + GSS_EAP_MECHANISM->length;
 392     }
 393     exportedNameLen += 4 + krbNameLen;
 394     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 395         major = gssEapExportAttrContext(minor, name, &attrs);
 396         if (GSS_ERROR(major))
 397             goto cleanup;
 398         exportedNameLen += 4 + attrs.length;
 399     }
 400
 401     exportedName->value = GSSEAP_MALLOC(exportedNameLen);
 402     if (exportedName->value == NULL) {
 403         major = GSS_S_FAILURE;
 404         *minor = ENOMEM;
 405         goto cleanup;
 406     }
 407     exportedName->length = exportedNameLen;
 408
 409     p = (unsigned char *)exportedName->value;
 410
 411     if (flags & EXPORT_NAME_FLAG_OID) {
 412         /* TOK | MECH_OID_LEN */
 413         store_uint16_be((flags & EXPORT_NAME_FLAG_COMPOSITE)
 414                         ? TOK_TYPE_EXPORT_NAME_COMPOSITE
 415                         : TOK_TYPE_EXPORT_NAME,
 416                         p);
 417         p += 2;
 418         store_uint16_be(GSS_EAP_MECHANISM->length + 2, p);
 419         p += 2;
 420
 421         /* MECH_OID */
 422         *p++ = 0x06;
 423         *p++ = GSS_EAP_MECHANISM->length & 0xff;
 424         memcpy(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length);
 425         p += GSS_EAP_MECHANISM->length;
 426     }
 427
 428     /* NAME_LEN */
 429     store_uint32_be(krbNameLen, p);
 430     p += 4;
 431
 432     /* NAME */
 433     memcpy(p, krbName, krbNameLen);
 434     p += krbNameLen;
 435
 436     if (flags & EXPORT_NAME_FLAG_COMPOSITE) {
 437         store_uint32_be(attrs.length, p);
 438         memcpy(&p[4], attrs.value, attrs.length);
 439         p += 4 + attrs.length;
 440     }
 441
 442     *minor = 0;
 443     major = GSS_S_COMPLETE;
 444
 445 cleanup:
 446     GSSEAP_MUTEX_UNLOCK(&name->mutex);
 447     gss_release_buffer(&tmpMinor, &attrs);
 448     if (GSS_ERROR(major))
 449         gss_release_buffer(&tmpMinor, exportedName);
 450     krb5_free_unparsed_name(krbContext, krbName);
 451
 452     return major;
 453 }