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  *
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  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
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  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 const gss_OID_desc gssEapNtPrincipalName = {
  59     /* 1.3.6.1.4.1.5322.21.2.1  */
  60     12, "\x06\x0A\x2B\x06\x01\x04\x01\xA9\x4A\x15\x02\x01"
  61 };
  62
  63 const gss_OID_desc *const GSS_EAP_NT_PRINCIPAL_NAME =
  64     &gssEapNtPrincipalName;
  65
  66 OM_uint32
  67 gssEapAllocName(OM_uint32 *minor, gss_name_t *pName)
  68 {
  69     OM_uint32 tmpMinor;
  70     gss_name_t name;
  71
  72     assert(*pName == GSS_C_NO_NAME);
  73
  74     name = (gss_name_t)GSSEAP_CALLOC(1, sizeof(*name));
  75     if (name == NULL) {
  76         *minor = ENOMEM;
  77         return GSS_S_FAILURE;
  78     }
  79
  80     if (GSSEAP_MUTEX_INIT(&name->mutex) != 0) {
  81         *minor = errno;
  82         gssEapReleaseName(&tmpMinor, &name);
  83         return GSS_S_FAILURE;
  84     }
  85
  86     *pName = name;
  87
  88     return GSS_S_COMPLETE;
  89 }
  90
  91 OM_uint32
  92 gssEapReleaseName(OM_uint32 *minor, gss_name_t *pName)
  93 {
  94     gss_name_t name;
  95     krb5_context krbContext = NULL;
  96     OM_uint32 tmpMinor;
  97
  98     if (pName == NULL) {
  99         return GSS_S_COMPLETE;
 100     }
 101
 102     name = *pName;
 103     if (name == GSS_C_NO_NAME) {
 104         return GSS_S_COMPLETE;
 105     }
 106
 107     GSSEAP_KRB_INIT(&krbContext);
 108     krb5_free_principal(krbContext, name->krbPrincipal);
 109
 110     radiusFreeAVPs(&tmpMinor, name->avps);
 111     samlFreeAssertion(&tmpMinor, name->assertion);
 112
 113     GSSEAP_MUTEX_DESTROY(&name->mutex);
 114     GSSEAP_FREE(name);
 115     *pName = NULL;
 116
 117     *minor = 0;
 118     return GSS_S_COMPLETE;
 119 }
 120
 121 static OM_uint32
 122 krbPrincipalToName(OM_uint32 *minor,
 123                    krb5_principal *principal,
 124                    gss_name_t *pName)
 125 {
 126     OM_uint32 major;
 127     gss_name_t name;
 128
 129     major = gssEapAllocName(minor, &name);
 130     if (GSS_ERROR(major))
 131         return major;
 132
 133     name->krbPrincipal = *principal;
 134     *principal = NULL;
 135
 136     *minor = 0;
 137     return GSS_S_COMPLETE;
 138 }
 139
 140 static OM_uint32
 141 importServiceName(OM_uint32 *minor,
 142                   const gss_buffer_t nameBuffer,
 143                   gss_name_t *pName)
 144 {
 145     OM_uint32 major, tmpMinor;
 146     krb5_context krbContext;
 147     krb5_principal krbPrinc;
 148     char *service, *host;
 149
 150     GSSEAP_KRB_INIT(&krbContext);
 151
 152     major = bufferToString(minor, nameBuffer, &service);
 153     if (GSS_ERROR(major))
 154         return major;
 155
 156     host = strchr(service, '@');
 157     if (host != NULL) {
 158         *host = '\0';
 159         host++;
 160     }
 161
 162     /* XXX this is probably NOT what we want to be doing */
 163     *minor = krb5_sname_to_principal(krbContext, host, service,
 164                                      KRB5_NT_SRV_HST, &krbPrinc);
 165     if (*minor != 0) {
 166         GSSEAP_FREE(service);
 167         return GSS_S_FAILURE;
 168     }
 169
 170     major = krbPrincipalToName(minor, &krbPrinc, pName);
 171     if (GSS_ERROR(major)) {
 172         krb5_free_principal(krbContext, krbPrinc);
 173     }
 174
 175     GSSEAP_FREE(service);
 176     return major;
 177 }
 178
 179 static OM_uint32
 180 importUserName(OM_uint32 *minor,
 181                const gss_buffer_t nameBuffer,
 182                gss_name_t *pName)
 183 {
 184     OM_uint32 major, tmpMinor;
 185     krb5_context krbContext;
 186     krb5_principal krbPrinc;
 187     char *nameString;
 188
 189     GSSEAP_KRB_INIT(&krbContext);
 190
 191     major = bufferToString(minor, nameBuffer, &nameString);
 192     if (GSS_ERROR(major))
 193         return major;
 194
 195     *minor = krb5_parse_name(krbContext, nameString, &krbPrinc);
 196     if (*minor != 0) {
 197         GSSEAP_FREE(nameString);
 198         return GSS_S_FAILURE;
 199     }
 200
 201     major = krbPrincipalToName(minor, &krbPrinc, pName);
 202     if (GSS_ERROR(major)) {
 203         krb5_free_principal(krbContext, krbPrinc);
 204     }
 205
 206     GSSEAP_FREE(nameString);
 207     return major;
 208 }
 209
 210 static OM_uint32
 211 importExportedName(OM_uint32 *minor,
 212                    const gss_buffer_t nameBuffer,
 213                    gss_name_t *pName)
 214 {
 215     OM_uint32 major, tmpMinor;
 216     krb5_context krbContext;
 217     unsigned char *p;
 218     int composite = 0;
 219     size_t len, remain;
 220     gss_buffer_desc buf;
 221
 222     GSSEAP_KRB_INIT(&krbContext);
 223
 224     p = (unsigned char *)nameBuffer->value;
 225     remain = nameBuffer->length;
 226
 227     if (remain < 6 + GSS_EAP_MECHANISM->length + 4)
 228         return GSS_S_BAD_NAME;
 229
 230     if (*p++ != 0x04)
 231         return GSS_S_BAD_NAME;
 232
 233     switch (*p++) {
 234     case 0x02:
 235         composite = 1;
 236         break;
 237     case 0x01:
 238         break;
 239     default:
 240         return GSS_S_BAD_NAME;
 241         break;
 242     }
 243     remain -= 2;
 244
 245     len = load_uint16_be(p);
 246     if (len != 2 + GSS_EAP_MECHANISM->length)
 247         return GSS_S_BAD_NAME;
 248     p += 2;
 249     remain -= 2;
 250
 251     if (*p++ != 0x06)
 252         return GSS_S_BAD_NAME;
 253     if (*p++ != GSS_EAP_MECHANISM->length)
 254         return GSS_S_BAD_MECH;
 255     remain -= 2;
 256
 257     if (memcmp(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length))
 258         return GSS_S_BAD_MECH;
 259     p += GSS_EAP_MECHANISM->length;
 260     remain -= GSS_EAP_MECHANISM->length;
 261
 262     len = load_uint32_be(p);
 263     p += 4;
 264
 265     if (remain < len)
 266         return GSS_S_BAD_NAME;
 267
 268     buf.length = len;
 269     buf.value = p;
 270
 271     p += len;
 272     remain -= len;
 273
 274     if (composite == 0 && remain != 0)
 275         return GSS_S_BAD_NAME;
 276
 277     major = importUserName(minor, &buf, pName);
 278     if (GSS_ERROR(major))
 279         return major;
 280
 281     /* XXX TODO composite handling */
 282
 283     return GSS_S_COMPLETE;
 284 }
 285
 286 OM_uint32 gssEapImportName(OM_uint32 *minor,
 287                            const gss_buffer_t nameBuffer,
 288                            gss_OID nameType,
 289                            gss_name_t *name)
 290 {
 291     OM_uint32 major, tmpMinor;
 292
 293     *name = GSS_C_NO_NAME;
 294
 295     if (nameType == GSS_C_NULL_OID ||
 296         oidEqual(nameType, GSS_C_NT_USER_NAME) ||
 297         oidEqual(nameType, GSS_EAP_NT_PRINCIPAL_NAME))
 298         major = importUserName(minor, nameBuffer, name);
 299     else if (oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE) ||
 300                oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE_X))
 301         major = importServiceName(minor, nameBuffer, name);
 302     else if (oidEqual(nameType, GSS_C_NT_EXPORT_NAME))
 303         major = importExportedName(minor, nameBuffer, name);
 304     else
 305         major = GSS_S_BAD_NAMETYPE;
 306
 307     if (GSS_ERROR(major))
 308         gssEapReleaseName(&tmpMinor, name);
 309
 310     return major;
 311 }
 312
 313 OM_uint32 gssEapExportName(OM_uint32 *minor,
 314                            const gss_name_t name,
 315                            gss_buffer_t exportedName,
 316                            int composite)
 317 {
 318     OM_uint32 major, tmpMinor;
 319     krb5_context krbContext;
 320     char *krbName = NULL;
 321     size_t krbNameLen;
 322     unsigned char *p;
 323
 324     exportedName->length = 0;
 325     exportedName->value = NULL;
 326
 327     GSSEAP_KRB_INIT(&krbContext);
 328
 329     if (name == GSS_C_NO_NAME) {
 330         *minor = EINVAL;
 331         return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME;
 332     }
 333
 334     GSSEAP_MUTEX_LOCK(&name->mutex);
 335
 336     /*
 337      * Don't export a composite name if we don't have any attributes.
 338      */
 339     if (composite &&
 340         (name->flags & (NAME_FLAG_SAML | NAME_FLAG_RADIUS)) == 0) {
 341         composite = 0;
 342     }
 343
 344     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 345     if (*minor != 0) {
 346         major = GSS_S_FAILURE;
 347         goto cleanup;
 348     }
 349     krbNameLen = strlen(krbName);
 350
 351     exportedName->length = 6 + GSS_EAP_MECHANISM->length + 4 + krbNameLen;
 352     if (composite) {
 353         /* TODO: export SAML/AVP, this is pending specification */
 354         GSSEAP_NOT_IMPLEMENTED;
 355     }
 356
 357     exportedName->value = GSSEAP_MALLOC(exportedName->length);
 358     if (exportedName->value == NULL) {
 359         *minor = ENOMEM;
 360         major = GSS_S_FAILURE;
 361         goto cleanup;
 362     }
 363
 364     p = (unsigned char *)exportedName->value;
 365     *p++ = 0x04;
 366     if (composite) {
 367         *p++ = 0x02;
 368     } else {
 369         *p++ = 0x01;
 370     }
 371     store_uint16_be(GSS_EAP_MECHANISM->length + 2, p);
 372     p += 2;
 373     *p++ = 0x06;
 374     *p++ = GSS_EAP_MECHANISM->length & 0xff;
 375     memcpy(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length);
 376     p += GSS_EAP_MECHANISM->length;
 377
 378     store_uint32_be(krbNameLen, p);
 379     p += 4;
 380     memcpy(p, krbName, krbNameLen);
 381     p += krbNameLen;
 382
 383     *minor = 0;
 384     major = GSS_S_COMPLETE;
 385
 386 cleanup:
 387     GSSEAP_MUTEX_UNLOCK(&name->mutex);
 388     if (GSS_ERROR(major))
 389         gss_release_buffer(&tmpMinor, exportedName);
 390     krb5_free_unparsed_name(krbContext, krbName);
 391
 392     return major;
 393 }