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     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     if (name->krbPrincipal->length == 1) {
 136         name->flags |= NAME_FLAG_NAI;
 137     } else {
 138         name->flags |= NAME_FLAG_SERVICE;
 139     }
 140
 141     *minor = 0;
 142     return GSS_S_COMPLETE;
 143 }
 144
 145 static OM_uint32
 146 importServiceName(OM_uint32 *minor,
 147                   const gss_buffer_t nameBuffer,
 148                   gss_name_t *pName)
 149 {
 150     OM_uint32 major, tmpMinor;
 151     krb5_context krbContext;
 152     krb5_principal krbPrinc;
 153     char *service, *host;
 154
 155     GSSEAP_KRB_INIT(&krbContext);
 156
 157     major = bufferToString(minor, nameBuffer, &service);
 158     if (GSS_ERROR(major))
 159         return major;
 160
 161     host = strchr(service, '@');
 162     if (host != NULL) {
 163         *host = '\0';
 164         host++;
 165     }
 166
 167     /* XXX this is probably NOT what we want to be doing */
 168     *minor = krb5_sname_to_principal(krbContext, host, service,
 169                                      KRB5_NT_SRV_HST, &krbPrinc);
 170     if (*minor != 0) {
 171         GSSEAP_FREE(service);
 172         return GSS_S_FAILURE;
 173     }
 174
 175     major = krbPrincipalToName(minor, &krbPrinc, pName);
 176     if (GSS_ERROR(major)) {
 177         krb5_free_principal(krbContext, krbPrinc);
 178     }
 179
 180     GSSEAP_FREE(service);
 181     return major;
 182 }
 183
 184 static OM_uint32
 185 importUserName(OM_uint32 *minor,
 186                const gss_buffer_t nameBuffer,
 187                gss_name_t *pName)
 188 {
 189     OM_uint32 major, tmpMinor;
 190     krb5_context krbContext;
 191     krb5_principal krbPrinc;
 192     char *nameString;
 193
 194     GSSEAP_KRB_INIT(&krbContext);
 195
 196     major = bufferToString(minor, nameBuffer, &nameString);
 197     if (GSS_ERROR(major))
 198         return major;
 199
 200     *minor = krb5_parse_name(krbContext, nameString, &krbPrinc);
 201     if (*minor != 0) {
 202         GSSEAP_FREE(nameString);
 203         return GSS_S_FAILURE;
 204     }
 205
 206     major = krbPrincipalToName(minor, &krbPrinc, pName);
 207     if (GSS_ERROR(major)) {
 208         krb5_free_principal(krbContext, krbPrinc);
 209     }
 210
 211     GSSEAP_FREE(nameString);
 212     return major;
 213 }
 214
 215 static OM_uint32
 216 importExportedName(OM_uint32 *minor,
 217                    const gss_buffer_t nameBuffer,
 218                    gss_name_t *pName)
 219 {
 220     OM_uint32 major, tmpMinor;
 221     krb5_context krbContext;
 222     unsigned char *p;
 223     int composite = 0;
 224     size_t len, remain;
 225     gss_buffer_desc buf;
 226     enum gss_eap_token_type tok_type;
 227
 228     GSSEAP_KRB_INIT(&krbContext);
 229
 230     p = (unsigned char *)nameBuffer->value;
 231     remain = nameBuffer->length;
 232
 233     if (remain < 6 + GSS_EAP_MECHANISM->length + 4)
 234         return GSS_S_BAD_NAME;
 235
 236     /* TOK_ID */
 237     tok_type = load_uint16_be(p);
 238     if (tok_type != TOK_TYPE_EXPORT_NAME &&
 239         tok_type != TOK_TYPE_EXPORT_NAME_COMPOSITE)
 240         return GSS_S_BAD_NAME;
 241     p += 2;
 242     remain -= 2;
 243
 244     /* MECH_OID_LEN */
 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     /* MECH_OID */
 252     if (p[0] != 0x06)
 253         return GSS_S_BAD_NAME;
 254     if (p[1] != GSS_EAP_MECHANISM->length)
 255         return GSS_S_BAD_MECH;
 256     if (memcmp(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length))
 257         return GSS_S_BAD_MECH;
 258     p += 2 + GSS_EAP_MECHANISM->length;
 259     remain -= 2 + GSS_EAP_MECHANISM->length;
 260
 261     /* NAME_LEN */
 262     len = load_uint32_be(p);
 263     p += 4;
 264
 265     if (remain < len)
 266         return GSS_S_BAD_NAME;
 267
 268     /* NAME */
 269     buf.length = len;
 270     buf.value = p;
 271
 272     p += len;
 273     remain -= len;
 274
 275     if (composite == 0 && remain != 0)
 276         return GSS_S_BAD_NAME;
 277
 278     major = importUserName(minor, &buf, pName);
 279     if (GSS_ERROR(major))
 280         return major;
 281
 282     /* XXX TODO composite handling */
 283
 284     return GSS_S_COMPLETE;
 285 }
 286
 287 OM_uint32 gssEapImportName(OM_uint32 *minor,
 288                            const gss_buffer_t nameBuffer,
 289                            gss_OID nameType,
 290                            gss_name_t *name)
 291 {
 292     OM_uint32 major, tmpMinor;
 293
 294     *name = GSS_C_NO_NAME;
 295
 296     if (nameType == GSS_C_NULL_OID ||
 297         oidEqual(nameType, GSS_C_NT_USER_NAME) ||
 298         oidEqual(nameType, GSS_EAP_NT_PRINCIPAL_NAME))
 299         major = importUserName(minor, nameBuffer, name);
 300     else if (oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE) ||
 301                oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE_X))
 302         major = importServiceName(minor, nameBuffer, name);
 303     else if (oidEqual(nameType, GSS_C_NT_EXPORT_NAME))
 304         major = importExportedName(minor, nameBuffer, name);
 305     else
 306         major = GSS_S_BAD_NAMETYPE;
 307
 308     if (GSS_ERROR(major))
 309         gssEapReleaseName(&tmpMinor, name);
 310
 311     return major;
 312 }
 313
 314 OM_uint32 gssEapExportName(OM_uint32 *minor,
 315                            const gss_name_t name,
 316                            gss_buffer_t exportedName,
 317                            int composite)
 318 {
 319     OM_uint32 major = GSS_S_FAILURE, tmpMinor;
 320     krb5_context krbContext;
 321     char *krbName = NULL;
 322     size_t krbNameLen;
 323     unsigned char *p;
 324
 325     exportedName->length = 0;
 326     exportedName->value = NULL;
 327
 328     GSSEAP_KRB_INIT(&krbContext);
 329     GSSEAP_MUTEX_LOCK(&name->mutex);
 330
 331     /*
 332      * Don't export a composite name if we don't have any attributes.
 333      */
 334     if (composite && !NAME_HAS_ATTRIBUTES(name))
 335         composite = 0;
 336
 337     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 338     if (*minor != 0)
 339         goto cleanup;
 340     krbNameLen = strlen(krbName);
 341
 342     exportedName->length = 6 + GSS_EAP_MECHANISM->length + 4 + krbNameLen;
 343     if (composite) {
 344         /* TODO: export SAML/AVP, this is pending specification */
 345         GSSEAP_NOT_IMPLEMENTED;
 346     }
 347
 348     exportedName->value = GSSEAP_MALLOC(exportedName->length);
 349     if (exportedName->value == NULL) {
 350         *minor = ENOMEM;
 351         goto cleanup;
 352     }
 353
 354     /* TOK | MECH_OID_LEN */
 355     p = (unsigned char *)exportedName->value;
 356     store_uint16_be(composite
 357                         ? TOK_TYPE_EXPORT_NAME_COMPOSITE
 358                         : TOK_TYPE_EXPORT_NAME,
 359                     p);
 360     p += 2;
 361     store_uint16_be(GSS_EAP_MECHANISM->length + 2, p);
 362     p += 2;
 363
 364     /* MECH_OID */
 365     *p++ = 0x06;
 366     *p++ = GSS_EAP_MECHANISM->length & 0xff;
 367     memcpy(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length);
 368     p += GSS_EAP_MECHANISM->length;
 369
 370     /* NAME_LEN */
 371     store_uint32_be(krbNameLen, p);
 372     p += 4;
 373
 374     /* NAME */
 375     memcpy(p, krbName, krbNameLen);
 376     p += krbNameLen;
 377
 378     *minor = 0;
 379     major = GSS_S_COMPLETE;
 380
 381 cleanup:
 382     GSSEAP_MUTEX_UNLOCK(&name->mutex);
 383     if (GSS_ERROR(major))
 384         gss_release_buffer(&tmpMinor, exportedName);
 385     krb5_free_unparsed_name(krbContext, krbName);
 386
 387     return major;
 388 }
 389
 390 static gss_buffer_desc attributePrefixes[] = {
 391     {
 392         /* ATTR_TYPE_NONE */
 393         0,
 394         NULL,
 395     },
 396     {
 397         /* ATTR_TYPE_SAML_AAA_ASSERTION */
 398         sizeof("urn:ietf:params:gss-eap:saml-aaa-assertion"),
 399         "urn:ietf:params:gss-eap:saml-aaa-assertion"
 400     },
 401     {
 402         /* ATTR_TYPE_SAML_ATTR */
 403         sizeof("urn:ietf:params:gss-eap:saml-attr"),
 404         "urn:ietf:params:gss-eap:saml-attr"
 405     },
 406     {
 407         /* ATTR_TYPE_RADIUS_AVP */
 408         sizeof("urn:ietf:params:gss-eap:radius-avp"),
 409         "urn:ietf:params:gss-eap:radius-avp",
 410     }
 411 };
 412
 413 enum gss_eap_attribute_type
 414 gssEapAttributePrefixToType(const gss_buffer_t prefix)
 415 {
 416     enum gss_eap_attribute_type i;
 417
 418     for (i = ATTR_TYPE_SAML_AAA_ASSERTION;
 419          i < sizeof(attributePrefixes) / sizeof(attributePrefixes[0]);
 420          i++)
 421     {
 422         gss_buffer_t p = &attributePrefixes[i];
 423
 424         if (p->length == prefix->length &&
 425             memcmp(p->value, prefix->value, prefix->length) == 0) {
 426             return i;
 427         }
 428     }
 429
 430     return ATTR_TYPE_NONE;
 431 }
 432
 433 gss_buffer_t
 434 gssEapAttributeTypeToPrefix(enum gss_eap_attribute_type type)
 435 {
 436     if (type <= ATTR_TYPE_NONE ||
 437         type > ATTR_TYPE_RADIUS_AVP)
 438         return GSS_C_NO_BUFFER;
 439
 440     return &attributePrefixes[type];
 441 }
 442
 443 OM_uint32
 444 decomposeAttributeName(OM_uint32 *minor,
 445                        const gss_buffer_t attribute,
 446                        gss_buffer_t prefix,
 447                        gss_buffer_t suffix)
 448 {
 449     char *p = NULL;
 450     int i;
 451
 452     for (i = 0; i < attribute->length; i++) {
 453         if (((char *)attribute->value)[i] == ' ') {
 454             p = (char *)attribute->value + i + 1;
 455             break;
 456         }
 457     }
 458
 459     prefix->value = attribute->value;
 460     prefix->length = i;
 461
 462     if (p != NULL && *p != '\0')  {
 463         suffix->length = attribute->length - 1 - prefix->length;
 464         suffix->value = p;
 465     } else {
 466         suffix->length = 0;
 467         suffix->value = NULL;
 468     }
 469
 470     *minor = 0;
 471     return GSS_S_COMPLETE;
 472 }
 473
 474 OM_uint32
 475 composeAttributeName(OM_uint32 *minor,
 476                        const gss_buffer_t prefix,
 477                        const gss_buffer_t suffix,
 478                        gss_buffer_t attribute)
 479 {
 480     size_t len = 0;
 481     char *p;
 482
 483     attribute->length = 0;
 484     attribute->value = NULL;
 485
 486     if (prefix == GSS_C_NO_BUFFER || prefix->length == 0)
 487         return GSS_S_COMPLETE;
 488
 489     len = prefix->length;
 490     if (suffix != NULL) {
 491         len += 1 + suffix->length;
 492     }
 493
 494     p = attribute->value = GSSEAP_MALLOC(len + 1);
 495     if (attribute->value == NULL) {
 496         *minor = ENOMEM;
 497         return GSS_S_FAILURE;
 498     }
 499     attribute->length = len;
 500
 501     memcpy(p, prefix->value, prefix->length);
 502     if (suffix != NULL) {
 503         p[prefix->length] = ' ';
 504         memcpy(p + prefix->length + 1, suffix->value, suffix->length);
 505     }
 506
 507     p[attribute->length] = '\0';
 508
 509     *minor = 0;
 510     return GSS_S_COMPLETE;
 511 }