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/*
* Copyright (C) 2011 Sansar Choinyambuu
* HSR Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*/
#include "pts_dh_group.h"
#include <utils/debug.h>
/**
* Described in header.
*/
bool pts_dh_group_probe(pts_dh_group_t *dh_groups, bool mandatory_dh_groups)
{
enumerator_t *enumerator;
diffie_hellman_group_t dh_group;
const char *plugin_name;
char format1[] = " %s PTS DH group %N[%s] available";
char format2[] = " %s PTS DH group %N not available";
*dh_groups = PTS_DH_GROUP_NONE;
enumerator = lib->crypto->create_dh_enumerator(lib->crypto);
while (enumerator->enumerate(enumerator, &dh_group, &plugin_name))
{
if (dh_group == MODP_1024_BIT)
{
*dh_groups |= PTS_DH_GROUP_IKE2;
DBG2(DBG_PTS, format1, "optional ", diffie_hellman_group_names,
dh_group, plugin_name);
}
else if (dh_group == MODP_1536_BIT)
{
*dh_groups |= PTS_DH_GROUP_IKE5;
DBG2(DBG_PTS, format1, "optional ", diffie_hellman_group_names,
dh_group, plugin_name);
}
else if (dh_group == MODP_2048_BIT)
{
*dh_groups |= PTS_DH_GROUP_IKE14;
DBG2(DBG_PTS, format1, "optional ", diffie_hellman_group_names,
dh_group, plugin_name);
}
else if (dh_group == ECP_256_BIT)
{
*dh_groups |= PTS_DH_GROUP_IKE19;
DBG2(DBG_PTS, format1, "mandatory", diffie_hellman_group_names,
dh_group, plugin_name);
}
else if (dh_group == ECP_384_BIT)
{
*dh_groups |= PTS_DH_GROUP_IKE20;
DBG2(DBG_PTS, format1, "optional ", diffie_hellman_group_names,
dh_group, plugin_name);
}
}
enumerator->destroy(enumerator);
if (*dh_groups & PTS_DH_GROUP_IKE19)
{
/* mandatory PTS DH group is available */
return TRUE;
}
if (*dh_groups == PTS_DH_GROUP_NONE)
{
DBG1(DBG_PTS, "no PTS DH group available");
return FALSE;
}
if (mandatory_dh_groups)
{
DBG1(DBG_PTS, format2, "mandatory", diffie_hellman_group_names,
ECP_256_BIT);
return FALSE;
}
/* at least one optional PTS DH group is available */
return TRUE;
}
/**
* Described in header.
*/
bool pts_dh_group_update(char *dh_group, pts_dh_group_t *dh_groups)
{
if (strcaseeq(dh_group, "ecp384"))
{
/* nothing to update, all groups are supported */
return TRUE;
}
if (strcaseeq(dh_group, "ecp256"))
{
/* remove DH group 20 */
*dh_groups &= ~PTS_DH_GROUP_IKE20;
return TRUE;
}
if (strcaseeq(dh_group, "modp2048"))
{
/* remove DH groups 19 and 20 */
*dh_groups &= ~(PTS_DH_GROUP_IKE20 | PTS_DH_GROUP_IKE19);
return TRUE;
}
if (strcaseeq(dh_group, "modp1536"))
{
/* remove DH groups 14, 19 and 20 */
*dh_groups &= ~(PTS_DH_GROUP_IKE20 | PTS_DH_GROUP_IKE19 |
PTS_DH_GROUP_IKE14);
return TRUE;
}
if (strcaseeq(dh_group, "modp1024"))
{
/* remove DH groups 5, 14, 19 and 20 */
*dh_groups &= ~(PTS_DH_GROUP_IKE20 | PTS_DH_GROUP_IKE19 |
PTS_DH_GROUP_IKE14 | PTS_DH_GROUP_IKE5);
return TRUE;
}
DBG1(DBG_PTS, "unknown DH group '%s' configured", dh_group);
return FALSE;
}
/**
* Described in header.
*/
pts_dh_group_t pts_dh_group_select(pts_dh_group_t supported_dh_groups,
pts_dh_group_t offered_dh_groups)
{
if ((supported_dh_groups & PTS_DH_GROUP_IKE20) &&
(offered_dh_groups & PTS_DH_GROUP_IKE20))
{
return PTS_DH_GROUP_IKE20;
}
if ((supported_dh_groups & PTS_DH_GROUP_IKE19) &&
(offered_dh_groups & PTS_DH_GROUP_IKE19))
{
return PTS_DH_GROUP_IKE19;
}
if ((supported_dh_groups & PTS_DH_GROUP_IKE14) &&
(offered_dh_groups & PTS_DH_GROUP_IKE14))
{
return PTS_DH_GROUP_IKE14;
}
if ((supported_dh_groups & PTS_DH_GROUP_IKE5) &&
(offered_dh_groups & PTS_DH_GROUP_IKE5))
{
return PTS_DH_GROUP_IKE5;
}
if ((supported_dh_groups & PTS_DH_GROUP_IKE2) &&
(offered_dh_groups & PTS_DH_GROUP_IKE2))
{
return PTS_DH_GROUP_IKE2;
}
return PTS_DH_GROUP_NONE;
}
/**
* Described in header.
*/
diffie_hellman_group_t pts_dh_group_to_ike(pts_dh_group_t dh_group)
{
switch (dh_group)
{
case PTS_DH_GROUP_IKE2:
return MODP_1024_BIT;
case PTS_DH_GROUP_IKE5:
return MODP_1536_BIT;
case PTS_DH_GROUP_IKE14:
return MODP_2048_BIT;
case PTS_DH_GROUP_IKE19:
return ECP_256_BIT;
case PTS_DH_GROUP_IKE20:
return ECP_384_BIT;
default:
return MODP_NONE;
}
}
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