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.
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  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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  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 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     assert(*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     radiusFreeAVPs(&tmpMinor, name->avps);
 110     samlFreeAssertion(&tmpMinor, name->assertion);
 111
 112     GSSEAP_MUTEX_DESTROY(&name->mutex);
 113     GSSEAP_FREE(name);
 114     *pName = NULL;
 115
 116     *minor = 0;
 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     *minor = 0;
 136     return GSS_S_COMPLETE;
 137 }
 138
 139 static OM_uint32
 140 importServiceName(OM_uint32 *minor,
 141                   const gss_buffer_t nameBuffer,
 142                   gss_name_t *pName)
 143 {
 144     OM_uint32 major, tmpMinor;
 145     krb5_context krbContext;
 146     krb5_principal krbPrinc;
 147     char *service, *host;
 148
 149     GSSEAP_KRB_INIT(&krbContext);
 150
 151     major = bufferToString(minor, nameBuffer, &service);
 152     if (GSS_ERROR(major))
 153         return major;
 154
 155     host = strchr(service, '@');
 156     if (host != NULL) {
 157         *host = '\0';
 158         host++;
 159     }
 160
 161     /* XXX this is probably NOT what we want to be doing */
 162     *minor = krb5_sname_to_principal(krbContext, host, service,
 163                                      KRB5_NT_SRV_HST, &krbPrinc);
 164     if (*minor != 0) {
 165         GSSEAP_FREE(service);
 166         return GSS_S_FAILURE;
 167     }
 168
 169     major = krbPrincipalToName(minor, &krbPrinc, pName);
 170     if (GSS_ERROR(major)) {
 171         krb5_free_principal(krbContext, krbPrinc);
 172     }
 173
 174     GSSEAP_FREE(service);
 175     return major;
 176 }
 177
 178 static OM_uint32
 179 importUserName(OM_uint32 *minor,
 180                const gss_buffer_t nameBuffer,
 181                gss_name_t *pName)
 182 {
 183     OM_uint32 major, tmpMinor;
 184     krb5_context krbContext;
 185     krb5_principal krbPrinc;
 186     char *nameString;
 187
 188     GSSEAP_KRB_INIT(&krbContext);
 189
 190     major = bufferToString(minor, nameBuffer, &nameString);
 191     if (GSS_ERROR(major))
 192         return major;
 193
 194     *minor = krb5_parse_name(krbContext, nameString, &krbPrinc);
 195     if (*minor != 0) {
 196         GSSEAP_FREE(nameString);
 197         return GSS_S_FAILURE;
 198     }
 199
 200     major = krbPrincipalToName(minor, &krbPrinc, pName);
 201     if (GSS_ERROR(major)) {
 202         krb5_free_principal(krbContext, krbPrinc);
 203     }
 204
 205     GSSEAP_FREE(nameString);
 206     return major;
 207 }
 208
 209 static OM_uint32
 210 importExportedName(OM_uint32 *minor,
 211                    const gss_buffer_t nameBuffer,
 212                    gss_name_t *pName)
 213 {
 214     OM_uint32 major, tmpMinor;
 215     krb5_context krbContext;
 216     unsigned char *p;
 217     int composite = 0;
 218     size_t len, remain;
 219     gss_buffer_desc buf;
 220     enum gss_eap_token_type tok_type;
 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     /* TOK_ID */
 231     tok_type = load_uint16_be(p);
 232     if (tok_type != TOK_TYPE_EXPORT_NAME &&
 233         tok_type != TOK_TYPE_EXPORT_NAME_COMPOSITE)
 234         return GSS_S_BAD_NAME;
 235     p += 2;
 236     remain -= 2;
 237
 238     /* MECH_OID_LEN */
 239     len = load_uint16_be(p);
 240     if (len != 2 + GSS_EAP_MECHANISM->length)
 241         return GSS_S_BAD_NAME;
 242     p += 2;
 243     remain -= 2;
 244
 245     /* MECH_OID */
 246     if (p[0] != 0x06)
 247         return GSS_S_BAD_NAME;
 248     if (p[1] != GSS_EAP_MECHANISM->length)
 249         return GSS_S_BAD_MECH;
 250     if (memcmp(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length))
 251         return GSS_S_BAD_MECH;
 252     p += 2 + GSS_EAP_MECHANISM->length;
 253     remain -= 2 + GSS_EAP_MECHANISM->length;
 254
 255     /* NAME_LEN */
 256     len = load_uint32_be(p);
 257     p += 4;
 258
 259     if (remain < len)
 260         return GSS_S_BAD_NAME;
 261
 262     /* NAME */
 263     buf.length = len;
 264     buf.value = p;
 265
 266     p += len;
 267     remain -= len;
 268
 269     if (composite == 0 && remain != 0)
 270         return GSS_S_BAD_NAME;
 271
 272     major = importUserName(minor, &buf, pName);
 273     if (GSS_ERROR(major))
 274         return major;
 275
 276     /* XXX TODO composite handling */
 277
 278     return GSS_S_COMPLETE;
 279 }
 280
 281 OM_uint32 gssEapImportName(OM_uint32 *minor,
 282                            const gss_buffer_t nameBuffer,
 283                            gss_OID nameType,
 284                            gss_name_t *name)
 285 {
 286     OM_uint32 major, tmpMinor;
 287
 288     *name = GSS_C_NO_NAME;
 289
 290     if (nameType == GSS_C_NULL_OID ||
 291         oidEqual(nameType, GSS_C_NT_USER_NAME) ||
 292         oidEqual(nameType, GSS_EAP_NT_PRINCIPAL_NAME))
 293         major = importUserName(minor, nameBuffer, name);
 294     else if (oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE) ||
 295                oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE_X))
 296         major = importServiceName(minor, nameBuffer, name);
 297     else if (oidEqual(nameType, GSS_C_NT_EXPORT_NAME))
 298         major = importExportedName(minor, nameBuffer, name);
 299     else
 300         major = GSS_S_BAD_NAMETYPE;
 301
 302     if (GSS_ERROR(major))
 303         gssEapReleaseName(&tmpMinor, name);
 304
 305     return major;
 306 }
 307
 308 OM_uint32 gssEapExportName(OM_uint32 *minor,
 309                            const gss_name_t name,
 310                            gss_buffer_t exportedName,
 311                            int composite)
 312 {
 313     OM_uint32 major = GSS_S_FAILURE, tmpMinor;
 314     krb5_context krbContext;
 315     char *krbName = NULL;
 316     size_t krbNameLen;
 317     unsigned char *p;
 318
 319     exportedName->length = 0;
 320     exportedName->value = NULL;
 321
 322     GSSEAP_KRB_INIT(&krbContext);
 323     GSSEAP_MUTEX_LOCK(&name->mutex);
 324
 325     /*
 326      * Don't export a composite name if we don't have any attributes.
 327      */
 328     if (composite &&
 329         (name->flags & (NAME_FLAG_SAML | NAME_FLAG_RADIUS)) == 0) {
 330         composite = 0;
 331     }
 332
 333     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 334     if (*minor != 0)
 335         goto cleanup;
 336     krbNameLen = strlen(krbName);
 337
 338     exportedName->length = 6 + GSS_EAP_MECHANISM->length + 4 + krbNameLen;
 339     if (composite) {
 340         /* TODO: export SAML/AVP, this is pending specification */
 341         GSSEAP_NOT_IMPLEMENTED;
 342     }
 343
 344     exportedName->value = GSSEAP_MALLOC(exportedName->length);
 345     if (exportedName->value == NULL) {
 346         *minor = ENOMEM;
 347         goto cleanup;
 348     }
 349
 350     /* TOK | MECH_OID_LEN */
 351     p = (unsigned char *)exportedName->value;
 352     store_uint16_be(composite
 353                         ? TOK_TYPE_EXPORT_NAME_COMPOSITE
 354                         : TOK_TYPE_EXPORT_NAME,
 355                     p);
 356     p += 2;
 357     store_uint16_be(GSS_EAP_MECHANISM->length + 2, p);
 358     p += 2;
 359
 360     /* MECH_OID */
 361     *p++ = 0x06;
 362     *p++ = GSS_EAP_MECHANISM->length & 0xff;
 363     memcpy(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length);
 364     p += GSS_EAP_MECHANISM->length;
 365
 366     /* NAME_LEN */
 367     store_uint32_be(krbNameLen, p);
 368     p += 4;
 369
 370     /* NAME */
 371     memcpy(p, krbName, krbNameLen);
 372     p += krbNameLen;
 373
 374     *minor = 0;
 375     major = GSS_S_COMPLETE;
 376
 377 cleanup:
 378     GSSEAP_MUTEX_UNLOCK(&name->mutex);
 379     if (GSS_ERROR(major))
 380         gss_release_buffer(&tmpMinor, exportedName);
 381     krb5_free_unparsed_name(krbContext, krbName);
 382
 383     return major;
 384 }