1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438
|
/*
* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2010 Free
* Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#include "gnutls_int.h"
#include "gnutls_errors.h"
#include "gnutls_auth.h"
#include "gnutls_auth.h"
#include "gnutls_algorithms.h"
#include "auth_cert.h"
#include "auth_psk.h"
#include <gnutls_datum.h>
#include "auth_anon.h"
/* The functions here are used in order for authentication algorithms
* to be able to retrieve the needed credentials eg public and private
* key etc.
*/
/**
* gnutls_credentials_clear:
* @session: is a #gnutls_session_t structure.
*
* Clears all the credentials previously set in this session.
**/
void
gnutls_credentials_clear (gnutls_session_t session)
{
if (session->key && session->key->cred)
{ /* beginning of the list */
auth_cred_st *ccred, *ncred;
ccred = session->key->cred;
while (ccred != NULL)
{
ncred = ccred->next;
gnutls_free (ccred);
ccred = ncred;
}
session->key->cred = NULL;
}
}
/*
* This creates a linked list of the form:
* { algorithm, credentials, pointer to next }
*/
/**
* gnutls_credentials_set:
* @session: is a #gnutls_session_t structure.
* @type: is the type of the credentials
* @cred: is a pointer to a structure.
*
* Sets the needed credentials for the specified type. Eg username,
* password - or public and private keys etc. The @cred parameter is
* a structure that depends on the specified type and on the current
* session (client or server).
*
* In order to minimize memory usage, and share credentials between
* several threads gnutls keeps a pointer to cred, and not the whole
* cred structure. Thus you will have to keep the structure allocated
* until you call gnutls_deinit().
*
* For %GNUTLS_CRD_ANON, @cred should be
* #gnutls_anon_client_credentials_t in case of a client. In case of
* a server it should be #gnutls_anon_server_credentials_t.
*
* For %GNUTLS_CRD_SRP, @cred should be #gnutls_srp_client_credentials_t
* in case of a client, and #gnutls_srp_server_credentials_t, in case
* of a server.
*
* For %GNUTLS_CRD_CERTIFICATE, @cred should be
* #gnutls_certificate_credentials_t.
*
* Returns: On success, %GNUTLS_E_SUCCESS (zero) is returned,
* otherwise an error code is returned.
**/
int
gnutls_credentials_set (gnutls_session_t session,
gnutls_credentials_type_t type, void *cred)
{
auth_cred_st *ccred = NULL, *pcred = NULL;
int exists = 0;
if (session->key->cred == NULL)
{ /* beginning of the list */
session->key->cred = gnutls_malloc (sizeof (auth_cred_st));
if (session->key->cred == NULL)
return GNUTLS_E_MEMORY_ERROR;
/* copy credentials locally */
session->key->cred->credentials = cred;
session->key->cred->next = NULL;
session->key->cred->algorithm = type;
}
else
{
ccred = session->key->cred;
while (ccred != NULL)
{
if (ccred->algorithm == type)
{
exists = 1;
break;
}
pcred = ccred;
ccred = ccred->next;
}
/* After this, pcred is not null.
*/
if (exists == 0)
{ /* new entry */
pcred->next = gnutls_malloc (sizeof (auth_cred_st));
if (pcred->next == NULL)
return GNUTLS_E_MEMORY_ERROR;
ccred = pcred->next;
/* copy credentials locally */
ccred->credentials = cred;
ccred->next = NULL;
ccred->algorithm = type;
}
else
{ /* modify existing entry */
ccred->credentials = cred;
}
}
return 0;
}
/**
* gnutls_auth_get_type:
* @session: is a #gnutls_session_t structure.
*
* Returns type of credentials for the current authentication schema.
* The returned information is to be used to distinguish the function used
* to access authentication data.
*
* Eg. for CERTIFICATE ciphersuites (key exchange algorithms:
* %GNUTLS_KX_RSA, %GNUTLS_KX_DHE_RSA), the same function are to be
* used to access the authentication data.
*
* Returns: The type of credentials for the current authentication
* schema, a #gnutls_credentials_type_t type.
**/
gnutls_credentials_type_t
gnutls_auth_get_type (gnutls_session_t session)
{
/* This is not the credentials we must set, but the authentication data
* we get by the peer, so it should be reversed.
*/
int server = session->security_parameters.entity == GNUTLS_SERVER ? 0 : 1;
return
_gnutls_map_kx_get_cred (_gnutls_cipher_suite_get_kx_algo
(&session->
security_parameters.current_cipher_suite),
server);
}
/**
* gnutls_auth_server_get_type:
* @session: is a #gnutls_session_t structure.
*
* Returns the type of credentials that were used for server authentication.
* The returned information is to be used to distinguish the function used
* to access authentication data.
*
* Returns: The type of credentials for the server authentication
* schema, a #gnutls_credentials_type_t type.
**/
gnutls_credentials_type_t
gnutls_auth_server_get_type (gnutls_session_t session)
{
return
_gnutls_map_kx_get_cred (_gnutls_cipher_suite_get_kx_algo
(&session->
security_parameters.current_cipher_suite), 1);
}
/**
* gnutls_auth_client_get_type:
* @session: is a #gnutls_session_t structure.
*
* Returns the type of credentials that were used for client authentication.
* The returned information is to be used to distinguish the function used
* to access authentication data.
*
* Returns: The type of credentials for the client authentication
* schema, a #gnutls_credentials_type_t type.
**/
gnutls_credentials_type_t
gnutls_auth_client_get_type (gnutls_session_t session)
{
return
_gnutls_map_kx_get_cred (_gnutls_cipher_suite_get_kx_algo
(&session->
security_parameters.current_cipher_suite), 0);
}
/*
* This returns a pointer to the linked list. Don't
* free that!!!
*/
const void *
_gnutls_get_kx_cred (gnutls_session_t session,
gnutls_kx_algorithm_t algo, int *err)
{
int server = session->security_parameters.entity == GNUTLS_SERVER ? 1 : 0;
return _gnutls_get_cred (session->key,
_gnutls_map_kx_get_cred (algo, server), err);
}
const void *
_gnutls_get_cred (gnutls_key_st key, gnutls_credentials_type_t type, int *err)
{
const void *retval = NULL;
int _err = -1;
auth_cred_st *ccred;
if (key == NULL)
goto out;
ccred = key->cred;
while (ccred != NULL)
{
if (ccred->algorithm == type)
{
break;
}
ccred = ccred->next;
}
if (ccred == NULL)
goto out;
_err = 0;
retval = ccred->credentials;
out:
if (err != NULL)
*err = _err;
return retval;
}
/*-
* _gnutls_get_auth_info - Returns a pointer to authentication information.
* @session: is a #gnutls_session_t structure.
*
* This function must be called after a successful gnutls_handshake().
* Returns a pointer to authentication information. That information
* is data obtained by the handshake protocol, the key exchange algorithm,
* and the TLS extensions messages.
*
* In case of GNUTLS_CRD_ANON returns a type of &anon_(server/client)_auth_info_t;
* In case of GNUTLS_CRD_CERTIFICATE returns a type of &cert_auth_info_t;
* In case of GNUTLS_CRD_SRP returns a type of &srp_(server/client)_auth_info_t;
-*/
void *
_gnutls_get_auth_info (gnutls_session_t session)
{
return session->key->auth_info;
}
/*-
* _gnutls_free_auth_info - Frees the auth info structure
* @session: is a #gnutls_session_t structure.
*
* This function frees the auth info structure and sets it to
* null. It must be called since some structures contain malloced
* elements.
-*/
void
_gnutls_free_auth_info (gnutls_session_t session)
{
dh_info_st *dh_info;
rsa_info_st *rsa_info;
if (session == NULL || session->key == NULL)
{
gnutls_assert ();
return;
}
switch (session->key->auth_info_type)
{
case GNUTLS_CRD_SRP:
break;
case GNUTLS_CRD_ANON:
{
anon_auth_info_t info = _gnutls_get_auth_info (session);
if (info == NULL)
break;
dh_info = &info->dh;
_gnutls_free_dh_info (dh_info);
}
break;
case GNUTLS_CRD_PSK:
{
psk_auth_info_t info = _gnutls_get_auth_info (session);
if (info == NULL)
break;
dh_info = &info->dh;
_gnutls_free_dh_info (dh_info);
}
break;
case GNUTLS_CRD_CERTIFICATE:
{
unsigned int i;
cert_auth_info_t info = _gnutls_get_auth_info (session);
if (info == NULL)
break;
dh_info = &info->dh;
rsa_info = &info->rsa_export;
for (i = 0; i < info->ncerts; i++)
{
_gnutls_free_datum (&info->raw_certificate_list[i]);
}
gnutls_free (info->raw_certificate_list);
info->raw_certificate_list = NULL;
info->ncerts = 0;
_gnutls_free_dh_info (dh_info);
_gnutls_free_rsa_info (rsa_info);
}
break;
default:
return;
}
gnutls_free (session->key->auth_info);
session->key->auth_info = NULL;
session->key->auth_info_size = 0;
session->key->auth_info_type = 0;
}
/* This function will set the auth info structure in the key
* structure.
* If allow change is !=0 then this will allow changing the auth
* info structure to a different type.
*/
int
_gnutls_auth_info_set (gnutls_session_t session,
gnutls_credentials_type_t type, int size,
int allow_change)
{
if (session->key->auth_info == NULL)
{
session->key->auth_info = gnutls_calloc (1, size);
if (session->key->auth_info == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
session->key->auth_info_type = type;
session->key->auth_info_size = size;
}
else
{
if (allow_change == 0)
{
/* If the credentials for the current authentication scheme,
* are not the one we want to set, then it's an error.
* This may happen if a rehandshake is performed an the
* ciphersuite which is negotiated has different authentication
* schema.
*/
if (gnutls_auth_get_type (session) != session->key->auth_info_type)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
}
else
{
/* The new behaviour: Here we reallocate the auth info structure
* in order to be able to negotiate different authentication
* types. Ie. perform an auth_anon and then authenticate again using a
* certificate (in order to prevent revealing the certificate's contents,
* to passive eavesdropers.
*/
if (gnutls_auth_get_type (session) != session->key->auth_info_type)
{
_gnutls_free_auth_info (session);
session->key->auth_info = calloc (1, size);
if (session->key->auth_info == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
session->key->auth_info_type = type;
session->key->auth_info_size = size;
}
}
}
return 0;
}
|