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     *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     *pName = name;
 142     *minor = 0;
 143
 144     return GSS_S_COMPLETE;
 145 }
 146
 147 static OM_uint32
 148 importServiceName(OM_uint32 *minor,
 149                   const gss_buffer_t nameBuffer,
 150                   gss_name_t *pName)
 151 {
 152     OM_uint32 major, tmpMinor;
 153     krb5_context krbContext;
 154     krb5_principal krbPrinc;
 155     char *service, *host;
 156
 157     GSSEAP_KRB_INIT(&krbContext);
 158
 159     major = bufferToString(minor, nameBuffer, &service);
 160     if (GSS_ERROR(major))
 161         return major;
 162
 163     host = strchr(service, '@');
 164     if (host != NULL) {
 165         *host = '\0';
 166         host++;
 167     }
 168
 169     /* XXX this is probably NOT what we want to be doing */
 170     *minor = krb5_sname_to_principal(krbContext, host, service,
 171                                      KRB5_NT_SRV_HST, &krbPrinc);
 172     if (*minor != 0) {
 173         GSSEAP_FREE(service);
 174         return GSS_S_FAILURE;
 175     }
 176
 177     major = krbPrincipalToName(minor, &krbPrinc, pName);
 178     if (GSS_ERROR(major)) {
 179         krb5_free_principal(krbContext, krbPrinc);
 180     }
 181
 182     GSSEAP_FREE(service);
 183     return major;
 184 }
 185
 186 static OM_uint32
 187 importUserName(OM_uint32 *minor,
 188                const gss_buffer_t nameBuffer,
 189                gss_name_t *pName)
 190 {
 191     OM_uint32 major, tmpMinor;
 192     krb5_context krbContext;
 193     krb5_principal krbPrinc;
 194     char *nameString;
 195
 196     GSSEAP_KRB_INIT(&krbContext);
 197
 198     major = bufferToString(minor, nameBuffer, &nameString);
 199     if (GSS_ERROR(major))
 200         return major;
 201
 202     *minor = krb5_parse_name(krbContext, nameString, &krbPrinc);
 203     if (*minor != 0) {
 204         GSSEAP_FREE(nameString);
 205         return GSS_S_FAILURE;
 206     }
 207
 208     major = krbPrincipalToName(minor, &krbPrinc, pName);
 209     if (GSS_ERROR(major)) {
 210         krb5_free_principal(krbContext, krbPrinc);
 211     }
 212
 213     GSSEAP_FREE(nameString);
 214     return major;
 215 }
 216
 217 static OM_uint32
 218 importExportedName(OM_uint32 *minor,
 219                    const gss_buffer_t nameBuffer,
 220                    gss_name_t *pName)
 221 {
 222     OM_uint32 major, tmpMinor;
 223     krb5_context krbContext;
 224     unsigned char *p;
 225     int composite = 0;
 226     size_t len, remain;
 227     gss_buffer_desc buf;
 228     enum gss_eap_token_type tok_type;
 229
 230     GSSEAP_KRB_INIT(&krbContext);
 231
 232     p = (unsigned char *)nameBuffer->value;
 233     remain = nameBuffer->length;
 234
 235     if (remain < 6 + GSS_EAP_MECHANISM->length + 4)
 236         return GSS_S_BAD_NAME;
 237
 238     /* TOK_ID */
 239     tok_type = load_uint16_be(p);
 240     if (tok_type != TOK_TYPE_EXPORT_NAME &&
 241         tok_type != TOK_TYPE_EXPORT_NAME_COMPOSITE)
 242         return GSS_S_BAD_NAME;
 243     p += 2;
 244     remain -= 2;
 245
 246     /* MECH_OID_LEN */
 247     len = load_uint16_be(p);
 248     if (len != 2 + GSS_EAP_MECHANISM->length)
 249         return GSS_S_BAD_NAME;
 250     p += 2;
 251     remain -= 2;
 252
 253     /* MECH_OID */
 254     if (p[0] != 0x06)
 255         return GSS_S_BAD_NAME;
 256     if (p[1] != GSS_EAP_MECHANISM->length)
 257         return GSS_S_BAD_MECH;
 258     if (memcmp(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length))
 259         return GSS_S_BAD_MECH;
 260     p += 2 + GSS_EAP_MECHANISM->length;
 261     remain -= 2 + GSS_EAP_MECHANISM->length;
 262
 263     /* NAME_LEN */
 264     len = load_uint32_be(p);
 265     p += 4;
 266
 267     if (remain < len)
 268         return GSS_S_BAD_NAME;
 269
 270     /* NAME */
 271     buf.length = len;
 272     buf.value = p;
 273
 274     p += len;
 275     remain -= len;
 276
 277     if (composite == 0 && remain != 0)
 278         return GSS_S_BAD_NAME;
 279
 280     major = importUserName(minor, &buf, pName);
 281     if (GSS_ERROR(major))
 282         return major;
 283
 284     /* XXX TODO composite handling */
 285
 286     return GSS_S_COMPLETE;
 287 }
 288
 289 OM_uint32 gssEapImportName(OM_uint32 *minor,
 290                            const gss_buffer_t nameBuffer,
 291                            gss_OID nameType,
 292                            gss_name_t *name)
 293 {
 294     OM_uint32 major, tmpMinor;
 295
 296     *name = GSS_C_NO_NAME;
 297
 298     if (nameType == GSS_C_NULL_OID ||
 299         oidEqual(nameType, GSS_C_NT_USER_NAME) ||
 300         oidEqual(nameType, GSS_EAP_NT_PRINCIPAL_NAME))
 301         major = importUserName(minor, nameBuffer, name);
 302     else if (oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE) ||
 303                oidEqual(nameType, GSS_C_NT_HOSTBASED_SERVICE_X))
 304         major = importServiceName(minor, nameBuffer, name);
 305     else if (oidEqual(nameType, GSS_C_NT_EXPORT_NAME))
 306         major = importExportedName(minor, nameBuffer, name);
 307     else
 308         major = GSS_S_BAD_NAMETYPE;
 309
 310     if (GSS_ERROR(major))
 311         gssEapReleaseName(&tmpMinor, name);
 312
 313     return major;
 314 }
 315
 316 OM_uint32 gssEapExportName(OM_uint32 *minor,
 317                            const gss_name_t name,
 318                            gss_buffer_t exportedName,
 319                            int composite)
 320 {
 321     OM_uint32 major = GSS_S_FAILURE, tmpMinor;
 322     krb5_context krbContext;
 323     char *krbName = NULL;
 324     size_t krbNameLen;
 325     unsigned char *p;
 326
 327     exportedName->length = 0;
 328     exportedName->value = NULL;
 329
 330     GSSEAP_KRB_INIT(&krbContext);
 331     GSSEAP_MUTEX_LOCK(&name->mutex);
 332
 333     /*
 334      * Don't export a composite name if we don't have any attributes.
 335      */
 336     if (composite && !NAME_HAS_ATTRIBUTES(name))
 337         composite = 0;
 338
 339     *minor = krb5_unparse_name(krbContext, name->krbPrincipal, &krbName);
 340     if (*minor != 0)
 341         goto cleanup;
 342     krbNameLen = strlen(krbName);
 343
 344     exportedName->length = 6 + GSS_EAP_MECHANISM->length + 4 + krbNameLen;
 345     if (composite) {
 346         /* TODO: export SAML/AVP, this is pending specification */
 347         GSSEAP_NOT_IMPLEMENTED;
 348     }
 349
 350     exportedName->value = GSSEAP_MALLOC(exportedName->length);
 351     if (exportedName->value == NULL) {
 352         *minor = ENOMEM;
 353         goto cleanup;
 354     }
 355
 356     /* TOK | MECH_OID_LEN */
 357     p = (unsigned char *)exportedName->value;
 358     store_uint16_be(composite
 359                         ? TOK_TYPE_EXPORT_NAME_COMPOSITE
 360                         : TOK_TYPE_EXPORT_NAME,
 361                     p);
 362     p += 2;
 363     store_uint16_be(GSS_EAP_MECHANISM->length + 2, p);
 364     p += 2;
 365
 366     /* MECH_OID */
 367     *p++ = 0x06;
 368     *p++ = GSS_EAP_MECHANISM->length & 0xff;
 369     memcpy(p, GSS_EAP_MECHANISM->elements, GSS_EAP_MECHANISM->length);
 370     p += GSS_EAP_MECHANISM->length;
 371
 372     /* NAME_LEN */
 373     store_uint32_be(krbNameLen, p);
 374     p += 4;
 375
 376     /* NAME */
 377     memcpy(p, krbName, krbNameLen);
 378     p += krbNameLen;
 379
 380     *minor = 0;
 381     major = GSS_S_COMPLETE;
 382
 383 cleanup:
 384     GSSEAP_MUTEX_UNLOCK(&name->mutex);
 385     if (GSS_ERROR(major))
 386         gss_release_buffer(&tmpMinor, exportedName);
 387     krb5_free_unparsed_name(krbContext, krbName);
 388
 389     return major;
 390 }
 391
 392 static gss_buffer_desc attributePrefixes[] = {
 393     {
 394         /* ATTR_TYPE_NONE */
 395         0,
 396         NULL,
 397     },
 398     {
 399         /* ATTR_TYPE_SAML_AAA_ASSERTION */
 400         sizeof("urn:ietf:params:gss-eap:saml-aaa-assertion"),
 401         "urn:ietf:params:gss-eap:saml-aaa-assertion"
 402     },
 403     {
 404         /* ATTR_TYPE_SAML_ATTR */
 405         sizeof("urn:ietf:params:gss-eap:saml-attr"),
 406         "urn:ietf:params:gss-eap:saml-attr"
 407     },
 408     {
 409         /* ATTR_TYPE_RADIUS_AVP */
 410         sizeof("urn:ietf:params:gss-eap:radius-avp"),
 411         "urn:ietf:params:gss-eap:radius-avp",
 412     }
 413 };
 414
 415 enum gss_eap_attribute_type
 416 gssEapAttributePrefixToType(const gss_buffer_t prefix)
 417 {
 418     enum gss_eap_attribute_type i;
 419
 420     for (i = ATTR_TYPE_SAML_AAA_ASSERTION;
 421          i < sizeof(attributePrefixes) / sizeof(attributePrefixes[0]);
 422          i++)
 423     {
 424         gss_buffer_t p = &attributePrefixes[i];
 425
 426         if (p->length == prefix->length &&
 427             memcmp(p->value, prefix->value, prefix->length) == 0) {
 428             return i;
 429         }
 430     }
 431
 432     return ATTR_TYPE_NONE;
 433 }
 434
 435 gss_buffer_t
 436 gssEapAttributeTypeToPrefix(enum gss_eap_attribute_type type)
 437 {
 438     if (type <= ATTR_TYPE_NONE ||
 439         type > ATTR_TYPE_RADIUS_AVP)
 440         return GSS_C_NO_BUFFER;
 441
 442     return &attributePrefixes[type];
 443 }
 444
 445 OM_uint32
 446 decomposeAttributeName(OM_uint32 *minor,
 447                        const gss_buffer_t attribute,
 448                        gss_buffer_t prefix,
 449                        gss_buffer_t suffix)
 450 {
 451     char *p = NULL;
 452     int i;
 453
 454     for (i = 0; i < attribute->length; i++) {
 455         if (((char *)attribute->value)[i] == ' ') {
 456             p = (char *)attribute->value + i + 1;
 457             break;
 458         }
 459     }
 460
 461     prefix->value = attribute->value;
 462     prefix->length = i;
 463
 464     if (p != NULL && *p != '\0')  {
 465         suffix->length = attribute->length - 1 - prefix->length;
 466         suffix->value = p;
 467     } else {
 468         suffix->length = 0;
 469         suffix->value = NULL;
 470     }
 471
 472     *minor = 0;
 473     return GSS_S_COMPLETE;
 474 }
 475
 476 OM_uint32
 477 composeAttributeName(OM_uint32 *minor,
 478                        const gss_buffer_t prefix,
 479                        const gss_buffer_t suffix,
 480                        gss_buffer_t attribute)
 481 {
 482     size_t len = 0;
 483     char *p;
 484
 485     attribute->length = 0;
 486     attribute->value = NULL;
 487
 488     if (prefix == GSS_C_NO_BUFFER || prefix->length == 0)
 489         return GSS_S_COMPLETE;
 490
 491     len = prefix->length;
 492     if (suffix != NULL) {
 493         len += 1 + suffix->length;
 494     }
 495
 496     p = attribute->value = GSSEAP_MALLOC(len + 1);
 497     if (attribute->value == NULL) {
 498         *minor = ENOMEM;
 499         return GSS_S_FAILURE;
 500     }
 501     attribute->length = len;
 502
 503     memcpy(p, prefix->value, prefix->length);
 504     if (suffix != NULL) {
 505         p[prefix->length] = ' ';
 506         memcpy(p + prefix->length + 1, suffix->value, suffix->length);
 507     }
 508
 509     p[attribute->length] = '\0';
 510
 511     *minor = 0;
 512     return GSS_S_COMPLETE;
 513 }