util.h

   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 2003-2010 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
  57 #ifndef _UTIL_H_
  58 #define _UTIL_H_ 1
  59
  60 #include <string.h>
  61 #include <errno.h>
  62
  63 #include <krb5.h>
  64
  65 #ifdef __cplusplus
  66 extern "C" {
  67 #endif
  68
  69 #ifndef MIN             /* Usually found in <sys/param.h>. */
  70 #define MIN(_a,_b)  ((_a)<(_b)?(_a):(_b))
  71 #endif
  72
  73 #define KRB_KEY_TYPE(key)       ((key)->enctype)
  74 #define KRB_KEY_DATA(key)       ((key)->contents)
  75 #define KRB_KEY_LENGTH(key)     ((key)->length)
  76 #define KRB_KEY_INIT(key)       do {        \
  77         KRB_KEY_TYPE(key) = ENCTYPE_NULL;   \
  78         KRB_KEY_DATA(key) = NULL;           \
  79         KRB_KEY_LENGTH(key) = 0;            \
  80     } while (0)
  81
  82 enum gss_eap_token_type {
  83     TOK_TYPE_NONE                    = 0x0000,  /* no token */
  84     TOK_TYPE_MIC                     = 0x0404,  /* RFC 4121 MIC token */
  85     TOK_TYPE_WRAP                    = 0x0504,  /* RFC 4121 wrap token */
  86     TOK_TYPE_EXPORT_NAME             = 0x0401,  /* RFC 2743 exported name */
  87     TOK_TYPE_EXPORT_NAME_COMPOSITE   = 0x0402,  /* draft-ietf-kitten-gss-naming */
  88     TOK_TYPE_DELETE_CONTEXT          = 0x0405,  /* RFC 2743 delete context */
  89     TOK_TYPE_EAP_RESP                = 0x0601,  /* draft-howlett-eap-gss */
  90     TOK_TYPE_EAP_REQ                 = 0x0602,  /* draft-howlett-eap-gss */
  91     TOK_TYPE_GSS_CB                  = 0x0603,  /* draft-howlett-eap-gss */
  92 };
  93
  94 #define EAP_EXPORT_CONTEXT_V1           1
  95
  96 /* util_buffer.c */
  97 OM_uint32
  98 makeStringBuffer(OM_uint32 *minor,
  99                  const char *string,
 100                  gss_buffer_t buffer);
 101
 102 OM_uint32
 103 bufferToString(OM_uint32 *minor,
 104                const gss_buffer_t buffer,
 105                char **pString);
 106
 107 OM_uint32
 108 duplicateBuffer(OM_uint32 *minor,
 109                 const gss_buffer_t src,
 110                 gss_buffer_t dst);
 111
 112 static inline int
 113 bufferEqual(const gss_buffer_t b1, const gss_buffer_t b2)
 114 {
 115     return (b1->length == b2->length &&
 116             memcmp(b1->value, b2->value, b2->length) == 0);
 117 }
 118
 119 static inline int
 120 bufferEqualString(const gss_buffer_t b1, const char *s)
 121 {
 122     gss_buffer_desc b2;
 123
 124     b2.length = strlen(s);
 125     b2.value = (char *)s;
 126
 127     return bufferEqual(b1, &b2);
 128 }
 129
 130 /* util_cksum.c */
 131 int
 132 gssEapSign(krb5_context context,
 133            krb5_cksumtype type,
 134            size_t rrc,
 135            krb5_keyblock *key,
 136            krb5_keyusage sign_usage,
 137            gss_iov_buffer_desc *iov,
 138            int iov_count);
 139
 140 int
 141 gssEapVerify(krb5_context context,
 142              krb5_cksumtype type,
 143              size_t rrc,
 144              krb5_keyblock *key,
 145              krb5_keyusage sign_usage,
 146              gss_iov_buffer_desc *iov,
 147              int iov_count,
 148              int *valid);
 149
 150 #if 0
 151 OM_uint32
 152 gssEapEncodeGssChannelBindings(OM_uint32 *minor,
 153                                gss_channel_bindings_t chanBindings,
 154                                gss_buffer_t encodedBindings);
 155 #endif
 156
 157 /* util_context.c */
 158 OM_uint32 gssEapAllocContext(OM_uint32 *minor, gss_ctx_id_t *pCtx);
 159 OM_uint32 gssEapReleaseContext(OM_uint32 *minor, gss_ctx_id_t *pCtx);
 160
 161 OM_uint32
 162 gssEapMakeToken(OM_uint32 *minor,
 163                 gss_ctx_id_t ctx,
 164                 const gss_buffer_t innerToken,
 165                 enum gss_eap_token_type tokenType,
 166                 gss_buffer_t outputToken);
 167
 168 OM_uint32
 169 gssEapVerifyToken(OM_uint32 *minor,
 170                   gss_ctx_id_t ctx,
 171                   const gss_buffer_t inputToken,
 172                   enum gss_eap_token_type tokenType,
 173                   gss_buffer_t innerInputToken);
 174
 175 /* util_cred.c */
 176 OM_uint32 gssEapAllocCred(OM_uint32 *minor, gss_cred_id_t *pCred);
 177 OM_uint32 gssEapReleaseCred(OM_uint32 *minor, gss_cred_id_t *pCred);
 178
 179 OM_uint32
 180 gssEapAcquireCred(OM_uint32 *minor,
 181                   const gss_name_t desiredName,
 182                   const gss_buffer_t password,
 183                   OM_uint32 timeReq,
 184                   const gss_OID_set desiredMechs,
 185                   int cred_usage,
 186                   gss_cred_id_t *pCred,
 187                   gss_OID_set *pActualMechs,
 188                   OM_uint32 *timeRec);
 189
 190 int gssEapCredAvailable(gss_cred_id_t cred, gss_OID mech);
 191
 192 /* util_crypt.c */
 193 int
 194 gssEapEncrypt(krb5_context context, int dce_style, size_t ec,
 195               size_t rrc, krb5_keyblock *key, int usage, krb5_pointer iv,
 196               gss_iov_buffer_desc *iov, int iov_count);
 197
 198 int
 199 gssEapDecrypt(krb5_context context, int dce_style, size_t ec,
 200               size_t rrc, krb5_keyblock *key, int usage, krb5_pointer iv,
 201               gss_iov_buffer_desc *iov, int iov_count);
 202
 203 krb5_cryptotype
 204 gssEapMapCryptoFlag(OM_uint32 type);
 205
 206 gss_iov_buffer_t
 207 gssEapLocateIov(gss_iov_buffer_desc *iov,
 208                 int iov_count,
 209                 OM_uint32 type);
 210
 211 void
 212 gssEapIovMessageLength(gss_iov_buffer_desc *iov,
 213                        int iov_count,
 214                        size_t *data_length,
 215                        size_t *assoc_data_length);
 216
 217 void
 218 gssEapReleaseIov(gss_iov_buffer_desc *iov, int iov_count);
 219
 220 int
 221 gssEapIsIntegrityOnly(gss_iov_buffer_desc *iov, int iov_count);
 222
 223 int
 224 gssEapAllocIov(gss_iov_buffer_t iov, size_t size);
 225
 226 OM_uint32
 227 gssEapDeriveRfc3961Key(OM_uint32 *minor,
 228                        const unsigned char *key,
 229                        size_t keyLength,
 230                        krb5_enctype enctype,
 231                        krb5_keyblock *pKey);
 232
 233 /* util_krb.c */
 234 OM_uint32
 235 gssEapKerberosInit(OM_uint32 *minor, krb5_context *context);
 236
 237 OM_uint32
 238 rfc3961ChecksumTypeForKey(OM_uint32 *minor,
 239                           krb5_keyblock *key,
 240                           krb5_cksumtype *cksumtype);
 241
 242 #define GSSEAP_KRB_INIT(ctx) do {                   \
 243         OM_uint32 tmpMajor;                         \
 244         tmpMajor  = gssEapKerberosInit(minor, ctx); \
 245         if (GSS_ERROR(tmpMajor)) {                  \
 246             return tmpMajor;                        \
 247         }                                           \
 248     } while (0)
 249
 250 /* util_mech.c */
 251 int
 252 gssEapInternalizeOid(const gss_OID oid,
 253                      gss_OID *const pInternalizedOid);
 254
 255 OM_uint32
 256 gssEapDefaultMech(OM_uint32 *minor,
 257                   gss_OID *oid);
 258
 259 OM_uint32
 260 gssEapIndicateMechs(OM_uint32 *minor,
 261                     gss_OID_set *mechs);
 262
 263 OM_uint32
 264 gssEapEnctypeToOid(OM_uint32 *minor,
 265                    krb5_enctype enctype,
 266                    gss_OID *pOid);
 267
 268 OM_uint32
 269 gssEapOidToEnctype(OM_uint32 *minor,
 270                    const gss_OID oid,
 271                    krb5_enctype *enctype);
 272
 273 int
 274 gssEapIsMechanismOid(const gss_OID oid);
 275
 276 int
 277 gssEapIsConcreteMechanismOid(const gss_OID oid);
 278
 279 OM_uint32
 280 gssEapValidateMechs(OM_uint32 *minor,
 281                    const gss_OID_set mechs);
 282
 283 /* util_name.c */
 284 OM_uint32 gssEapAllocName(OM_uint32 *minor, gss_name_t *pName);
 285 OM_uint32 gssEapReleaseName(OM_uint32 *minor, gss_name_t *pName);
 286 OM_uint32 gssEapExportName(OM_uint32 *minor,
 287                            const gss_name_t name,
 288                            gss_buffer_t exportedName,
 289                            int composite);
 290 OM_uint32 gssEapImportName(OM_uint32 *minor,
 291                            const gss_buffer_t input_name_buffer,
 292                            gss_OID input_name_type,
 293                            gss_name_t *output_name);
 294
 295 /* util_oid.c */
 296 OM_uint32
 297 composeOid(OM_uint32 *minor_status,
 298            const char *prefix,
 299            size_t prefix_len,
 300            int suffix,
 301            gss_OID_desc *oid);
 302
 303 OM_uint32
 304 decomposeOid(OM_uint32 *minor_status,
 305              const char *prefix,
 306              size_t prefix_len,
 307              gss_OID_desc *oid,
 308              int *suffix) ;
 309
 310 OM_uint32
 311 duplicateOid(OM_uint32 *minor_status,
 312              const gss_OID_desc * const oid,
 313              gss_OID *new_oid);
 314
 315 OM_uint32
 316 duplicateOidSet(OM_uint32 *minor,
 317                 const gss_OID_set src,
 318                 gss_OID_set *dst);
 319
 320 static inline int
 321 oidEqual(const gss_OID_desc *o1, const gss_OID_desc *o2)
 322 {
 323     if (o1 == GSS_C_NO_OID)
 324         return (o2 == GSS_C_NO_OID);
 325     else if (o2 == GSS_C_NO_OID)
 326         return (o1 == GSS_C_NO_OID);
 327     else
 328         return (o1->length == o2->length &&
 329                 memcmp(o1->elements, o2->elements, o1->length) == 0);
 330 }
 331
 332 /* util_ordering.c */
 333 OM_uint32
 334 sequenceInternalize(OM_uint32 *minor,
 335                     void **vqueue,
 336                     unsigned char **buf,
 337                     size_t *lenremain);
 338
 339 OM_uint32
 340 sequenceExternalize(OM_uint32 *minor,
 341                     void *vqueue,
 342                     unsigned char **buf,
 343                     size_t *lenremain);
 344
 345 size_t
 346 sequenceSize(void *vqueue);
 347
 348 OM_uint32
 349 sequenceFree(OM_uint32 *minor, void **vqueue);
 350
 351 OM_uint32
 352 sequenceCheck(OM_uint32 *minor, void **vqueue, uint64_t seqnum);
 353
 354 OM_uint32
 355 sequenceInit(OM_uint32 *minor, void **vqueue, uint64_t seqnum,
 356              int do_replay, int do_sequence, int wide_nums);
 357
 358 /* util_token.c */
 359 size_t
 360 tokenSize(const gss_OID_desc *mech, size_t body_size);
 361
 362 void
 363 makeTokenHeader(const gss_OID_desc *mech,
 364                 size_t body_size,
 365                 unsigned char **buf,
 366                 enum gss_eap_token_type tok_type);
 367
 368 OM_uint32
 369 verifyTokenHeader(OM_uint32 *minor,
 370                   gss_OID mech,
 371                   size_t *body_size,
 372                   unsigned char **buf_in,
 373                   size_t toksize_in,
 374                   enum gss_eap_token_type tok_type);
 375
 376 /* Helper macros */
 377 #define GSSEAP_CALLOC(count, size)      (calloc((count), (size)))
 378 #define GSSEAP_FREE(ptr)                (free((ptr)))
 379 #define GSSEAP_MALLOC(size)             (malloc((size)))
 380 #define GSSEAP_REALLOC(ptr, size)       (realloc((ptr), (size)))
 381
 382 #define GSSEAP_NOT_IMPLEMENTED          do {            \
 383         assert(0 && "not implemented");                 \
 384         *minor = ENOSYS;                                \
 385         return GSS_S_FAILURE;                           \
 386     } while (0)
 387
 388 #include <pthread.h>
 389
 390 #define GSSEAP_MUTEX                    pthread_mutex_t
 391 #define GSSEAP_MUTEX_INITIALIZER        PTHREAD_MUTEX_INITIALIZER
 392
 393 #define GSSEAP_MUTEX_INIT(m)            pthread_mutex_init((m), NULL)
 394 #define GSSEAP_MUTEX_DESTROY(m)         pthread_mutex_destroy((m))
 395 #define GSSEAP_MUTEX_LOCK(m)            pthread_mutex_lock((m))
 396 #define GSSEAP_MUTEX_UNLOCK(m)          pthread_mutex_unlock((m))
 397
 398 #define GSSEAP_THREAD_KEY               pthread_key_t
 399 #define GSSEAP_KEY_CREATE(k, d)         pthread_key_create((k), (d))
 400 #define GSSEAP_GETSPECIFIC(k)           pthread_getspecific((k))
 401 #define GSSEAP_SETSPECIFIC(k, d)        pthread_setspecific((k), (d))
 402
 403 #define GSSEAP_THREAD_ONCE              pthread_once_t
 404 #define GSSEAP_ONCE(o, i)               pthread_once((o), (i))
 405 #define GSSEAP_ONCE_INITIALIZER         PTHREAD_ONCE_INIT
 406
 407 /* Helper functions */
 408 static inline void
 409 store_uint16_be(uint16_t val, void *vp)
 410 {
 411     unsigned char *p = (unsigned char *)vp;
 412
 413     p[0] = (val >>  8) & 0xff;
 414     p[1] = (val      ) & 0xff;
 415 }
 416
 417 static inline uint16_t
 418 load_uint16_be(const void *cvp)
 419 {
 420     const unsigned char *p = (const unsigned char *)cvp;
 421
 422     return (p[1] | (p[0] << 8));
 423 }
 424
 425 static inline void
 426 store_uint32_be(uint32_t val, void *vp)
 427 {
 428     unsigned char *p = (unsigned char *)vp;
 429
 430     p[0] = (val >> 24) & 0xff;
 431     p[1] = (val >> 16) & 0xff;
 432     p[2] = (val >>  8) & 0xff;
 433     p[3] = (val      ) & 0xff;
 434 }
 435
 436 static inline uint32_t
 437 load_uint32_be(const void *cvp)
 438 {
 439     const unsigned char *p = (const unsigned char *)cvp;
 440
 441     return (p[3] | (p[2] << 8)
 442             | ((uint32_t) p[1] << 16)
 443             | ((uint32_t) p[0] << 24));
 444 }
 445
 446 static inline void
 447 store_uint64_be(uint64_t val, void *vp)
 448 {
 449     unsigned char *p = (unsigned char *)vp;
 450
 451     p[0] = (unsigned char)((val >> 56) & 0xff);
 452     p[1] = (unsigned char)((val >> 48) & 0xff);
 453     p[2] = (unsigned char)((val >> 40) & 0xff);
 454     p[3] = (unsigned char)((val >> 32) & 0xff);
 455     p[4] = (unsigned char)((val >> 24) & 0xff);
 456     p[5] = (unsigned char)((val >> 16) & 0xff);
 457     p[6] = (unsigned char)((val >>  8) & 0xff);
 458     p[7] = (unsigned char)((val      ) & 0xff);
 459 }
 460
 461 static inline uint64_t
 462 load_uint64_be(const void *cvp)
 463 {
 464     const unsigned char *p = (const unsigned char *)cvp;
 465
 466     return ((uint64_t)load_uint32_be(p) << 32) | load_uint32_be(p + 4);
 467 }
 468
 469 static inline unsigned char *
 470 store_buffer(gss_buffer_t buffer, void *vp, int wide_nums)
 471 {
 472     unsigned char *p = (unsigned char *)vp;
 473
 474     if (wide_nums) {
 475         store_uint64_be(buffer->length, p);
 476         p += 8;
 477     } else {
 478         store_uint32_be(buffer->length, p);
 479         p += 4;
 480     }
 481
 482     if (buffer->value != NULL) {
 483         memcpy(p, buffer->value, buffer->length);
 484         p += buffer->length;
 485     }
 486
 487     return p;
 488 }
 489
 490 static inline unsigned char *
 491 load_buffer(const void *cvp, size_t length, gss_buffer_t buffer)
 492 {
 493     buffer->length = 0;
 494     buffer->value = GSSEAP_MALLOC(length);
 495     if (buffer->value == NULL)
 496         return NULL;
 497     buffer->length = length;
 498     memcpy(buffer->value, cvp, length);
 499     return (unsigned char *)cvp + length;
 500 }
 501
 502 static inline unsigned char *
 503 store_oid(gss_OID oid, void *vp)
 504 {
 505     gss_buffer_desc buf;
 506
 507     if (oid != GSS_C_NO_OID) {
 508         buf.length = oid->length;
 509         buf.value = oid->elements;
 510     } else {
 511         buf.length = 0;
 512         buf.value = NULL;
 513     }
 514
 515     return store_buffer(&buf, vp, FALSE);
 516 }
 517
 518 #ifdef __cplusplus
 519 }
 520 #endif
 521
 522 #include "util_attr.h"
 523
 524 #endif /* _UTIL_H_ */