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/*
* Copyright (C) 2000, 2004, 2005, 2007, 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
*
*/
/* Contains functions that are supposed to pack and unpack session data,
* before and after they are sent to the database backend.
*/
#include <gnutls_int.h>
#ifdef ENABLE_SRP
#include <auth_srp.h>
#endif
#ifdef ENABLE_PSK
#include <auth_psk.h>
#endif
#include <auth_anon.h>
#include <auth_cert.h>
#include <gnutls_errors.h>
#include <gnutls_auth.h>
#include <gnutls_session_pack.h>
#include <gnutls_datum.h>
#include <gnutls_num.h>
#include <gnutls_extensions.h>
#include <gnutls_constate.h>
static int pack_certificate_auth_info (gnutls_session_t,
gnutls_buffer_st * packed_session);
static int unpack_certificate_auth_info (gnutls_session_t,
gnutls_buffer_st * packed_session);
static int unpack_srp_auth_info (gnutls_session_t session,
gnutls_buffer_st * packed_session);
static int pack_srp_auth_info (gnutls_session_t session,
gnutls_buffer_st * packed_session);
static int unpack_psk_auth_info (gnutls_session_t session,
gnutls_buffer_st * packed_session);
static int pack_psk_auth_info (gnutls_session_t session,
gnutls_buffer_st * packed_session);
static int unpack_anon_auth_info (gnutls_session_t session,
gnutls_buffer_st * packed_session);
static int pack_anon_auth_info (gnutls_session_t session,
gnutls_buffer_st * packed_session);
static int unpack_security_parameters (gnutls_session_t session,
gnutls_buffer_st * packed_session);
static int pack_security_parameters (gnutls_session_t session,
gnutls_buffer_st * packed_session);
/* Since auth_info structures contain malloced data, this function
* is required in order to pack these structures in a vector in
* order to store them to the DB.
*
* packed_session will contain the session data.
*
* The data will be in a platform independent format.
*/
int
_gnutls_session_pack (gnutls_session_t session,
gnutls_datum_t * packed_session)
{
int ret;
gnutls_buffer_st sb;
opaque id;
if (packed_session == NULL)
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
_gnutls_buffer_init (&sb);
id = gnutls_auth_get_type (session);
BUFFER_APPEND (&sb, &id, 1);
switch (id)
{
#ifdef ENABLE_SRP
case GNUTLS_CRD_SRP:
ret = pack_srp_auth_info (session, &sb);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
break;
#endif
#ifdef ENABLE_PSK
case GNUTLS_CRD_PSK:
ret = pack_psk_auth_info (session, &sb);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
break;
#endif
#ifdef ENABLE_ANON
case GNUTLS_CRD_ANON:
ret = pack_anon_auth_info (session, &sb);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
break;
#endif
case GNUTLS_CRD_CERTIFICATE:
ret = pack_certificate_auth_info (session, &sb);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
break;
default:
return GNUTLS_E_INTERNAL_ERROR;
}
/* Auth_info structures copied. Now copy security_parameters_st.
* packed_session must have allocated space for the security parameters.
*/
ret = pack_security_parameters (session, &sb);
if (ret < 0)
{
gnutls_assert ();
_gnutls_buffer_clear (&sb);
return ret;
}
ret = _gnutls_ext_pack (session, &sb);
if (ret < 0)
{
gnutls_assert ();
_gnutls_buffer_clear (&sb);
return ret;
}
ret = _gnutls_buffer_to_datum (&sb, packed_session);
return ret;
}
/* Load session data from a buffer.
*/
int
_gnutls_session_unpack (gnutls_session_t session,
const gnutls_datum_t * packed_session)
{
int ret;
gnutls_buffer_st sb;
opaque id;
_gnutls_buffer_init (&sb);
if (packed_session == NULL || packed_session->size == 0)
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
ret =
_gnutls_buffer_append_data (&sb, packed_session->data,
packed_session->size);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
if (_gnutls_get_auth_info (session) != NULL)
{
_gnutls_free_auth_info (session);
}
BUFFER_POP (&sb, &id, 1);
switch (id)
{
#ifdef ENABLE_SRP
case GNUTLS_CRD_SRP:
ret = unpack_srp_auth_info (session, &sb);
if (ret < 0)
{
gnutls_assert ();
goto error;
}
break;
#endif
#ifdef ENABLE_PSK
case GNUTLS_CRD_PSK:
ret = unpack_psk_auth_info (session, &sb);
if (ret < 0)
{
gnutls_assert ();
goto error;
}
break;
#endif
#ifdef ENABLE_ANON
case GNUTLS_CRD_ANON:
ret = unpack_anon_auth_info (session, &sb);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
break;
#endif
case GNUTLS_CRD_CERTIFICATE:
ret = unpack_certificate_auth_info (session, &sb);
if (ret < 0)
{
gnutls_assert ();
goto error;
}
break;
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto error;
}
/* Auth_info structures copied. Now copy security_parameters_st.
* packed_session must have allocated space for the security parameters.
*/
ret = unpack_security_parameters (session, &sb);
if (ret < 0)
{
gnutls_assert ();
goto error;
}
ret = _gnutls_ext_unpack (session, &sb);
if (ret < 0)
{
gnutls_assert ();
goto error;
}
ret = 0;
error:
_gnutls_buffer_clear (&sb);
return ret;
}
/* Format:
* 1 byte the credentials type
* 4 bytes the size of the whole structure
* DH stuff
* 2 bytes the size of secret key in bits
* 4 bytes the size of the prime
* x bytes the prime
* 4 bytes the size of the generator
* x bytes the generator
* 4 bytes the size of the public key
* x bytes the public key
* RSA stuff
* 4 bytes the size of the modulus
* x bytes the modulus
* 4 bytes the size of the exponent
* x bytes the exponent
* CERTIFICATES
* 4 bytes the length of the certificate list
* 4 bytes the size of first certificate
* x bytes the certificate
* and so on...
*/
static int
pack_certificate_auth_info (gnutls_session_t session, gnutls_buffer_st * ps)
{
unsigned int i;
int cur_size, ret;
cert_auth_info_t info = _gnutls_get_auth_info (session);
int size_offset;
size_offset = ps->length;
BUFFER_APPEND_NUM (ps, 0);
cur_size = ps->length;
if (info)
{
BUFFER_APPEND_NUM (ps, info->dh.secret_bits);
BUFFER_APPEND_PFX (ps, info->dh.prime.data, info->dh.prime.size);
BUFFER_APPEND_PFX (ps, info->dh.generator.data,
info->dh.generator.size);
BUFFER_APPEND_PFX (ps, info->dh.public_key.data,
info->dh.public_key.size);
BUFFER_APPEND_PFX (ps, info->rsa_export.modulus.data,
info->rsa_export.modulus.size);
BUFFER_APPEND_PFX (ps, info->rsa_export.exponent.data,
info->rsa_export.exponent.size);
BUFFER_APPEND_NUM (ps, info->ncerts);
for (i = 0; i < info->ncerts; i++)
BUFFER_APPEND_PFX (ps, info->raw_certificate_list[i].data,
info->raw_certificate_list[i].size);
}
/* write the real size */
_gnutls_write_uint32 (ps->length - cur_size, ps->data + size_offset);
return 0;
}
/* Upack certificate info.
*/
static int
unpack_certificate_auth_info (gnutls_session_t session, gnutls_buffer_st * ps)
{
int ret;
unsigned int i = 0, j = 0;
size_t pack_size;
cert_auth_info_t info = NULL;
BUFFER_POP_NUM (ps, pack_size);
if (pack_size == 0)
return 0; /* nothing to be done */
/* client and server have the same auth_info here
*/
ret =
_gnutls_auth_info_set (session, GNUTLS_CRD_CERTIFICATE,
sizeof (cert_auth_info_st), 1);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
info = _gnutls_get_auth_info (session);
if (info == NULL)
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
BUFFER_POP_NUM (ps, info->dh.secret_bits);
BUFFER_POP_DATUM (ps, &info->dh.prime);
BUFFER_POP_DATUM (ps, &info->dh.generator);
BUFFER_POP_DATUM (ps, &info->dh.public_key);
BUFFER_POP_DATUM (ps, &info->rsa_export.modulus);
BUFFER_POP_DATUM (ps, &info->rsa_export.exponent);
BUFFER_POP_NUM (ps, info->ncerts);
if (info->ncerts > 0)
{
info->raw_certificate_list =
gnutls_calloc (info->ncerts, sizeof (gnutls_datum_t));
if (info->raw_certificate_list == NULL)
{
gnutls_assert ();
ret = GNUTLS_E_MEMORY_ERROR;
goto error;
}
}
for (i = 0; i < info->ncerts; i++)
{
BUFFER_POP_DATUM (ps, &info->raw_certificate_list[i]);
}
return 0;
error:
if (info)
{
_gnutls_free_datum (&info->dh.prime);
_gnutls_free_datum (&info->dh.generator);
_gnutls_free_datum (&info->dh.public_key);
_gnutls_free_datum (&info->rsa_export.modulus);
_gnutls_free_datum (&info->rsa_export.exponent);
for (j = 0; j < i; j++)
_gnutls_free_datum (&info->raw_certificate_list[j]);
gnutls_free (info->raw_certificate_list);
}
return ret;
}
#ifdef ENABLE_SRP
/* Packs the SRP session authentication data.
*/
/* Format:
* 1 byte the credentials type
* 4 bytes the size of the SRP username (x)
* x bytes the SRP username
*/
static int
pack_srp_auth_info (gnutls_session_t session, gnutls_buffer_st * ps)
{
srp_server_auth_info_t info = _gnutls_get_auth_info (session);
int len, ret;
int size_offset;
size_t cur_size;
if (info && info->username)
len = strlen (info->username) + 1; /* include the terminating null */
else
len = 0;
size_offset = ps->length;
BUFFER_APPEND_NUM (ps, 0);
cur_size = ps->length;
BUFFER_APPEND_PFX (ps, info->username, len);
/* write the real size */
_gnutls_write_uint32 (ps->length - cur_size, ps->data + size_offset);
return 0;
}
static int
unpack_srp_auth_info (gnutls_session_t session, gnutls_buffer_st * ps)
{
size_t username_size;
int ret;
srp_server_auth_info_t info;
BUFFER_POP_NUM (ps, username_size);
if (username_size > sizeof (info->username))
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
ret =
_gnutls_auth_info_set (session, GNUTLS_CRD_SRP,
sizeof (srp_server_auth_info_st), 1);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
info = _gnutls_get_auth_info (session);
if (info == NULL)
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
BUFFER_POP (ps, info->username, username_size);
ret = 0;
error:
return ret;
}
#endif
#ifdef ENABLE_ANON
/* Packs the ANON session authentication data.
*/
/* Format:
* 1 byte the credentials type
* 4 bytes the size of the whole structure
* 2 bytes the size of secret key in bits
* 4 bytes the size of the prime
* x bytes the prime
* 4 bytes the size of the generator
* x bytes the generator
* 4 bytes the size of the public key
* x bytes the public key
*/
static int
pack_anon_auth_info (gnutls_session_t session, gnutls_buffer_st * ps)
{
int cur_size, ret;
anon_auth_info_t info = _gnutls_get_auth_info (session);
int size_offset;
size_offset = ps->length;
BUFFER_APPEND_NUM (ps, 0);
cur_size = ps->length;
if (info)
{
BUFFER_APPEND_NUM (ps, info->dh.secret_bits);
BUFFER_APPEND_PFX (ps, info->dh.prime.data, info->dh.prime.size);
BUFFER_APPEND_PFX (ps, info->dh.generator.data,
info->dh.generator.size);
BUFFER_APPEND_PFX (ps, info->dh.public_key.data,
info->dh.public_key.size);
}
/* write the real size */
_gnutls_write_uint32 (ps->length - cur_size, ps->data + size_offset);
return 0;
}
static int
unpack_anon_auth_info (gnutls_session_t session, gnutls_buffer_st * ps)
{
int ret;
size_t pack_size;
anon_auth_info_t info = NULL;
BUFFER_POP_NUM (ps, pack_size);
if (pack_size == 0)
return 0; /* nothing to be done */
/* client and server have the same auth_info here
*/
ret =
_gnutls_auth_info_set (session, GNUTLS_CRD_ANON,
sizeof (anon_auth_info_st), 1);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
info = _gnutls_get_auth_info (session);
if (info == NULL)
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
BUFFER_POP_NUM (ps, info->dh.secret_bits);
BUFFER_POP_DATUM (ps, &info->dh.prime);
BUFFER_POP_DATUM (ps, &info->dh.generator);
BUFFER_POP_DATUM (ps, &info->dh.public_key);
return 0;
error:
if (info)
{
_gnutls_free_datum (&info->dh.prime);
_gnutls_free_datum (&info->dh.generator);
_gnutls_free_datum (&info->dh.public_key);
}
return ret;
}
#endif /* ANON */
#ifdef ENABLE_PSK
/* Packs the PSK session authentication data.
*/
/* Format:
* 1 byte the credentials type
* 4 bytes the size of the whole structure
*
* 4 bytes the size of the PSK username (x)
* x bytes the PSK username
* 2 bytes the size of secret key in bits
* 4 bytes the size of the prime
* x bytes the prime
* 4 bytes the size of the generator
* x bytes the generator
* 4 bytes the size of the public key
* x bytes the public key
*/
static int
pack_psk_auth_info (gnutls_session_t session, gnutls_buffer_st * ps)
{
psk_auth_info_t info;
int username_len;
int hint_len, ret;
int size_offset;
size_t cur_size;
info = _gnutls_get_auth_info (session);
if (info && info->username)
username_len = strlen (info->username) + 1; /* include the terminating null */
else
username_len = 0;
if (info && info->hint)
hint_len = strlen (info->hint) + 1; /* include the terminating null */
else
hint_len = 0;
size_offset = ps->length;
BUFFER_APPEND_NUM (ps, 0);
cur_size = ps->length;
BUFFER_APPEND_PFX (ps, info->username, username_len);
BUFFER_APPEND_PFX (ps, info->hint, hint_len);
BUFFER_APPEND_NUM (ps, info->dh.secret_bits);
BUFFER_APPEND_PFX (ps, info->dh.prime.data, info->dh.prime.size);
BUFFER_APPEND_PFX (ps, info->dh.generator.data, info->dh.generator.size);
BUFFER_APPEND_PFX (ps, info->dh.public_key.data, info->dh.public_key.size);
/* write the real size */
_gnutls_write_uint32 (ps->length - cur_size, ps->data + size_offset);
return 0;
}
static int
unpack_psk_auth_info (gnutls_session_t session, gnutls_buffer_st * ps)
{
size_t username_size, hint_size;
int ret;
psk_auth_info_t info;
ret =
_gnutls_auth_info_set (session, GNUTLS_CRD_PSK,
sizeof (psk_auth_info_st), 1);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
info = _gnutls_get_auth_info (session);
if (info == NULL)
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
BUFFER_POP_NUM (ps, username_size);
if (username_size > sizeof (info->username))
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
BUFFER_POP (ps, info->username, username_size);
BUFFER_POP_NUM (ps, hint_size);
if (hint_size > sizeof (info->hint))
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
BUFFER_POP (ps, info->hint, hint_size);
BUFFER_POP_NUM (ps, info->dh.secret_bits);
BUFFER_POP_DATUM (ps, &info->dh.prime);
BUFFER_POP_DATUM (ps, &info->dh.generator);
BUFFER_POP_DATUM (ps, &info->dh.public_key);
ret = 0;
error:
_gnutls_free_datum (&info->dh.prime);
_gnutls_free_datum (&info->dh.generator);
_gnutls_free_datum (&info->dh.public_key);
return ret;
}
#endif
/* Packs the security parameters.
*/
/* Format:
* 4 bytes the total security data size
* 1 byte the entity type (client/server)
* 1 byte the key exchange algorithm used
* 1 byte the read cipher algorithm
* 1 byte the read mac algorithm
* 1 byte the read compression algorithm
*
* 1 byte the write cipher algorithm
* 1 byte the write mac algorithm
* 1 byte the write compression algorithm
*
* 1 byte the certificate type
* 1 byte the protocol version
*
* 2 bytes the cipher suite
*
* 48 bytes the master secret
*
* 32 bytes the client random
* 32 bytes the server random
*
* 1 byte the session ID size
* x bytes the session ID (32 bytes max)
*
* 4 bytes a timestamp
* -------------------
* MAX: 165 bytes
*
*/
static int
pack_security_parameters (gnutls_session_t session, gnutls_buffer_st * ps)
{
int ret;
int size_offset;
size_t cur_size;
record_parameters_st *params;
if (session->security_parameters.epoch_read
!= session->security_parameters.epoch_write)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
ret = _gnutls_epoch_get (session, EPOCH_READ_CURRENT, ¶ms);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
/* move after the auth info stuff.
*/
size_offset = ps->length;
BUFFER_APPEND_NUM (ps, 0);
cur_size = ps->length;
BUFFER_APPEND_NUM (ps, session->security_parameters.entity);
BUFFER_APPEND_NUM (ps, session->security_parameters.kx_algorithm);
BUFFER_APPEND (ps,
&session->security_parameters.current_cipher_suite.suite[0],
1);
BUFFER_APPEND (ps,
&session->security_parameters.current_cipher_suite.suite[1],
1);
BUFFER_APPEND_NUM (ps, params->compression_algorithm);
BUFFER_APPEND_NUM (ps, session->security_parameters.cert_type);
BUFFER_APPEND_NUM (ps, session->security_parameters.version);
BUFFER_APPEND (ps, session->security_parameters.master_secret,
GNUTLS_MASTER_SIZE);
BUFFER_APPEND (ps, session->security_parameters.client_random,
GNUTLS_RANDOM_SIZE);
BUFFER_APPEND (ps, session->security_parameters.server_random,
GNUTLS_RANDOM_SIZE);
BUFFER_APPEND_NUM (ps, session->security_parameters.session_id_size);
BUFFER_APPEND (ps, session->security_parameters.session_id,
session->security_parameters.session_id_size);
BUFFER_APPEND_NUM (ps, session->security_parameters.max_record_send_size);
BUFFER_APPEND_NUM (ps, session->security_parameters.max_record_recv_size);
BUFFER_APPEND_NUM (ps, session->security_parameters.timestamp);
_gnutls_write_uint32 (ps->length - cur_size, ps->data + size_offset);
return 0;
}
static int
unpack_security_parameters (gnutls_session_t session, gnutls_buffer_st * ps)
{
size_t pack_size;
int ret;
time_t timestamp = gnutls_time (0);
BUFFER_POP_NUM (ps, pack_size);
if (pack_size == 0)
return GNUTLS_E_INVALID_REQUEST;
memset (&session->internals.resumed_security_parameters, 0,
sizeof (session->internals.resumed_security_parameters));
BUFFER_POP_NUM (ps, session->internals.resumed_security_parameters.entity);
BUFFER_POP_NUM (ps,
session->internals.resumed_security_parameters.kx_algorithm);
BUFFER_POP (ps,
&session->internals.
resumed_security_parameters.current_cipher_suite.suite[0], 1);
BUFFER_POP (ps,
&session->internals.resumed_security_parameters.
current_cipher_suite.suite[1], 1);
BUFFER_POP_NUM (ps, session->internals.resumed_compression_method);
BUFFER_POP_NUM (ps, session->internals.resumed_security_parameters.cert_type);
BUFFER_POP_NUM (ps, session->internals.resumed_security_parameters.version);
BUFFER_POP (ps,
session->internals.resumed_security_parameters.master_secret,
GNUTLS_MASTER_SIZE);
BUFFER_POP (ps,
session->internals.resumed_security_parameters.client_random,
GNUTLS_RANDOM_SIZE);
BUFFER_POP (ps,
session->internals.resumed_security_parameters.server_random,
GNUTLS_RANDOM_SIZE);
BUFFER_POP_NUM (ps,
session->internals.
resumed_security_parameters.session_id_size);
BUFFER_POP (ps, session->internals.resumed_security_parameters.session_id,
session->internals.resumed_security_parameters.session_id_size);
BUFFER_POP_NUM (ps,
session->internals.
resumed_security_parameters.max_record_send_size);
BUFFER_POP_NUM (ps,
session->internals.
resumed_security_parameters.max_record_recv_size);
BUFFER_POP_NUM (ps,
session->internals.resumed_security_parameters.timestamp);
if (timestamp - session->internals.resumed_security_parameters.timestamp >
session->internals.expire_time
|| session->internals.resumed_security_parameters.timestamp > timestamp)
{
gnutls_assert ();
return GNUTLS_E_EXPIRED;
}
ret = 0;
error:
return ret;
}
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