mech_eap/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
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  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, tmpMinor;
 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, tmpMinor;
 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 static OM_uint32
 217 importExportedName(OM_uint32 *minor,
 218                    const gss_buffer_t nameBuffer,
 219                    gss_name_t *pName)
 220 {
 221     OM_uint32 major, tmpMinor;
 222     krb5_context krbContext;
 223     unsigned char *p;
 224     size_t len, remain;
 225     gss_buffer_desc buf;
 226     enum gss_eap_token_type tok_type;
 227     gss_name_t name = GSS_C_NO_NAME;
 228
 229     GSSEAP_KRB_INIT(&krbContext);
 230
 231     p = (unsigned char *)nameBuffer->value;
 232     remain = nameBuffer->length;
 233
 234     if (remain < 6 + GSS_EAP_MECHANISM->length + 4)
 235         return GSS_S_BAD_NAME;
 236
 237 #define UPDATE_REMAIN(n)    do {            \
 238         p += (n);                           \
 239         remain -= (n);                      \
 240     } while (0)
 241
 242     /* TOK_ID */
 243     tok_type = load_uint16_be(p);
 244     if (tok_type != TOK_TYPE_EXPORT_NAME &&
 245         tok_type != TOK_TYPE_EXPORT_NAME_COMPOSITE)
 246         return GSS_S_BAD_NAME;
 247     UPDATE_REMAIN(2);
 248
 249     /* MECH_OID_LEN */
 250     len = load_uint16_be(p);
 251     if (len != 2 + GSS_EAP_MECHANISM->length)
 252         return GSS_S_BAD_NAME;
 253     UPDATE_REMAIN(2);
 254
 255     /* MECH_OID */
 256     if (p[0] != 0x06)
 257         return GSS_S_BAD_NAME;
 258     if (p[1] != GSS_EAP_MECHANISM->length)
 259         return GSS_S_BAD_MECH;
 260     if (memcmp(&p[2], GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length))
 261         return GSS_S_BAD_MECH;
 262     UPDATE_REMAIN(2 + GSS_EAP_MECHANISM->length);
 263
 264     /* NAME_LEN */
 265     len = load_uint32_be(p);
 266     UPDATE_REMAIN(4);
 267
 268 #define CHECK_REMAIN(n)     do {        \
 269         if (remain < (n)) {             \
 270             *minor = ERANGE;            \
 271             major = GSS_S_BAD_NAME;     \
 272             goto cleanup;               \
 273         }                               \
 274     } while (0)
 275
 276     /* NAME */
 277     CHECK_REMAIN(len);
 278     buf.length = len;
 279     buf.value = p;
 280     UPDATE_REMAIN(len);
 281
 282     major = importUserName(minor, &buf, &name);
 283     if (GSS_ERROR(major))
 284         goto cleanup;
 285
 286     if (tok_type == TOK_TYPE_EXPORT_NAME_COMPOSITE) {
 287         gss_buffer_desc buf;
 288
 289         CHECK_REMAIN(4);
 290         buf.length = load_uint32_be(p);
 291         UPDATE_REMAIN(4);
 292
 293         CHECK_REMAIN(buf.length);
 294         buf.value = p;
 295         UPDATE_REMAIN(buf.length);
 296
 297         major = gssEapImportAttrContext(minor, &buf, name);
 298         if (GSS_ERROR(major))
 299             goto cleanup;
 300     }
 301
 302     major = GSS_S_COMPLETE;
 303
 304 cleanup:
 305     if (GSS_ERROR(major))
 306         gssEapReleaseName(&tmpMinor, &name);
 307     else
 308         *pName = name;
 309
 310     return major;
 311 }
 312
 313 OM_uint32
 314 gssEapImportName(OM_uint32 *minor,
 315                  const gss_buffer_t nameBuffer,
 316                  gss_OID nameType,
 317                  gss_name_t *name)
 318 {
 319     OM_uint32 major, tmpMinor;
 320
 321     *name = GSS_C_NO_NAME;
 322
 323     if (nameType == GSS_C_NULL_OID ||
 324         oidEqual(nameType, GSS_C_NT_USER_NAME) ||
 325         oidEqual(nameType, GSS_EAP_NT_PRINCIPAL_NAME))
 326         major = importUserName(minor, nameBuffer, name);
 327     else if (oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE) ||
 328                oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE_X))
 329         major = importServiceName(minor, nameBuffer, name);
 330     else if (oidEqual(nameType, GSS_C_NT_EXPORT_NAME))
 331         major = importExportedName(minor, nameBuffer, name);
 332     else
 333         major = GSS_S_BAD_NAMETYPE;
 334
 335     if (GSS_ERROR(major))
 336         gssEapReleaseName(&tmpMinor, name);
 337
 338     return major;
 339 }
 340
 341 OM_uint32
 342 gssEapExportName(OM_uint32 *minor,
 343                  const gss_name_t name,
 344                  gss_buffer_t exportedName,
 345                  int composite)
 346 {
 347     OM_uint32 major = GSS_S_FAILURE, tmpMinor;
 348     krb5_context krbContext;
 349     char *krbName = NULL;
 350     size_t krbNameLen;
 351     unsigned char *p;
 352     gss_buffer_desc attrs = GSS_C_EMPTY_BUFFER;
 353
 354     exportedName->length = 0;
 355     exportedName->value = NULL;
 356
 357     GSSEAP_KRB_INIT(&krbContext);
 358     GSSEAP_MUTEX_LOCK(&name->mutex);
 359
 360     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 361     if (*minor != 0) {
 362         major = GSS_S_FAILURE;
 363         goto cleanup;
 364     }
 365     krbNameLen = strlen(krbName);
 366
 367     exportedName->length = 6 + GSS_EAP_MECHANISM->length + 4 + krbNameLen;
 368     if (composite) {
 369         major = gssEapExportAttrContext(minor, name, &attrs);
 370         if (GSS_ERROR(major))
 371             goto cleanup;
 372         exportedName->length += 4 + attrs.length;
 373     }
 374
 375     exportedName->value = GSSEAP_MALLOC(exportedName->length);
 376     if (exportedName->value == NULL) {
 377         major = GSS_S_FAILURE;
 378         *minor = ENOMEM;
 379         goto cleanup;
 380     }
 381
 382     /* TOK | MECH_OID_LEN */
 383     p = (unsigned char *)exportedName->value;
 384     store_uint16_be(composite
 385                         ? TOK_TYPE_EXPORT_NAME_COMPOSITE
 386                         : TOK_TYPE_EXPORT_NAME,
 387                     p);
 388     p += 2;
 389     store_uint16_be(GSS_EAP_MECHANISM->length + 2, p);
 390     p += 2;
 391
 392     /* MECH_OID */
 393     *p++ = 0x06;
 394     *p++ = GSS_EAP_MECHANISM->length & 0xff;
 395     memcpy(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length);
 396     p += GSS_EAP_MECHANISM->length;
 397
 398     /* NAME_LEN */
 399     store_uint32_be(krbNameLen, p);
 400     p += 4;
 401
 402     /* NAME */
 403     memcpy(p, krbName, krbNameLen);
 404     p += krbNameLen;
 405
 406     if (composite) {
 407         store_uint32_be(attrs.length, p);
 408         memcpy(&p[4], attrs.value, attrs.length);
 409         p += 4 + attrs.length;
 410     }
 411
 412     *minor = 0;
 413     major = GSS_S_COMPLETE;
 414
 415 cleanup:
 416     GSSEAP_MUTEX_UNLOCK(&name->mutex);
 417     gss_release_buffer(&tmpMinor, &attrs);
 418     if (GSS_ERROR(major))
 419         gss_release_buffer(&tmpMinor, exportedName);
 420     krb5_free_unparsed_name(krbContext, krbName);
 421
 422     return major;
 423 }
 424