/*
* Copyright (C) 2012-2013 Tobias Brunner
* Copyright (C) 2009 Martin Willi
* 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.
*/
/*
* Copyright (C) 2012-2014 Volker Rümelin
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "isakmp_vendor.h"
#include <daemon.h>
#include <encoding/payloads/vendor_id_payload.h>
typedef struct private_isakmp_vendor_t private_isakmp_vendor_t;
/**
* Private data of an isakmp_vendor_t object.
*/
struct private_isakmp_vendor_t {
/**
* Public isakmp_vendor_t interface.
*/
isakmp_vendor_t public;
/**
* Associated IKE_SA
*/
ike_sa_t *ike_sa;
/**
* Are we the initiator of this task
*/
bool initiator;
/**
* Index of best nat traversal VID found
*/
int best_natt_ext;
/**
* Number of times we have been invoked
*/
int count;
};
/**
* IKEv1 Vendor ID database
*/
static struct {
/* Description */
char *desc;
/* extension flag negotiated with vendor ID, if any */
ike_extension_t extension;
/* send yourself? */
bool send;
/* length of vendor ID string */
int len;
/* vendor ID string */
char *id;
} vendor_ids[] = {
/* strongSwan MD5("strongSwan") */
{ "strongSwan", EXT_STRONGSWAN, FALSE, 16,
"\x88\x2f\xe5\x6d\x6f\xd2\x0d\xbc\x22\x51\x61\x3b\x2e\xbe\x5b\xeb"},
/* XAuth, MD5("draft-ietf-ipsra-isakmp-xauth-06.txt") */
{ "XAuth", EXT_XAUTH, TRUE, 8,
"\x09\x00\x26\x89\xdf\xd6\xb7\x12"},
/* Dead peer detection, RFC 3706 */
{ "DPD", EXT_DPD, TRUE, 16,
"\xaf\xca\xd7\x13\x68\xa1\xf1\xc9\x6b\x86\x96\xfc\x77\x57\x01\x00"},
/* CISCO-UNITY, similar to DPD the last two bytes indicate the version */
{ "Cisco Unity", EXT_CISCO_UNITY, FALSE, 16,
"\x12\xf5\xf2\x8c\x45\x71\x68\xa9\x70\x2d\x9f\xe2\x74\xcc\x01\x00"},
/* Proprietary IKE fragmentation extension. Capabilities are handled
* specially on receipt of this VID. Windows peers send this VID
* without capabilities, but accept it with and without capabilities. */
{ "FRAGMENTATION", EXT_IKE_FRAGMENTATION, FALSE, 20,
"\x40\x48\xb7\xd5\x6e\xbc\xe8\x85\x25\xe7\xde\x7f\x00\xd6\xc2\xd3\x80\x00\x00\x00"},
/* Windows peers send this VID and a version number */
{ "MS NT5 ISAKMPOAKLEY", EXT_MS_WINDOWS, FALSE, 20,
"\x1e\x2b\x51\x69\x05\x99\x1c\x7d\x7c\x96\xfc\xbf\xb5\x87\xe4\x61\x00\x00\x00\x00"},
}, vendor_natt_ids[] = {
/* NAT-Traversal VIDs ordered by preference */
/* NAT-Traversal, MD5("RFC 3947") */
{ "NAT-T (RFC 3947)", EXT_NATT, TRUE, 16,
"\x4a\x13\x1c\x81\x07\x03\x58\x45\x5c\x57\x28\xf2\x0e\x95\x45\x2f"},
{ "draft-ietf-ipsec-nat-t-ike-03", EXT_NATT | EXT_NATT_DRAFT_02_03,
FALSE, 16,
"\x7d\x94\x19\xa6\x53\x10\xca\x6f\x2c\x17\x9d\x92\x15\x52\x9d\x56"},
{ "draft-ietf-ipsec-nat-t-ike-02", EXT_NATT | EXT_NATT_DRAFT_02_03,
FALSE, 16,
"\xcd\x60\x46\x43\x35\xdf\x21\xf8\x7c\xfd\xb2\xfc\x68\xb6\xa4\x48"},
{ "draft-ietf-ipsec-nat-t-ike-02\\n", EXT_NATT | EXT_NATT_DRAFT_02_03,
TRUE, 16,
"\x90\xcb\x80\x91\x3e\xbb\x69\x6e\x08\x63\x81\xb5\xec\x42\x7b\x1f"},
{ "draft-ietf-ipsec-nat-t-ike-08", 0, FALSE, 16,
"\x8f\x8d\x83\x82\x6d\x24\x6b\x6f\xc7\xa8\xa6\xa4\x28\xc1\x1d\xe8"},
{ "draft-ietf-ipsec-nat-t-ike-07", 0, FALSE, 16,
"\x43\x9b\x59\xf8\xba\x67\x6c\x4c\x77\x37\xae\x22\xea\xb8\xf5\x82"},
{ "draft-ietf-ipsec-nat-t-ike-06", 0, FALSE, 16,
"\x4d\x1e\x0e\x13\x6d\xea\xfa\x34\xc4\xf3\xea\x9f\x02\xec\x72\x85"},
{ "draft-ietf-ipsec-nat-t-ike-05", 0, FALSE, 16,
"\x80\xd0\xbb\x3d\xef\x54\x56\x5e\xe8\x46\x45\xd4\xc8\x5c\xe3\xee"},
{ "draft-ietf-ipsec-nat-t-ike-04", 0, FALSE, 16,
"\x99\x09\xb6\x4e\xed\x93\x7c\x65\x73\xde\x52\xac\xe9\x52\xfa\x6b"},
{ "draft-ietf-ipsec-nat-t-ike-00", 0, FALSE, 16,
"\x44\x85\x15\x2d\x18\xb6\xbb\xcd\x0b\xe8\xa8\x46\x95\x79\xdd\xcc"},
{ "draft-ietf-ipsec-nat-t-ike", 0, FALSE, 16,
"\x4d\xf3\x79\x28\xe9\xfc\x4f\xd1\xb3\x26\x21\x70\xd5\x15\xc6\x62"},
{ "draft-stenberg-ipsec-nat-traversal-02", 0, FALSE, 16,
"\x61\x05\xc4\x22\xe7\x68\x47\xe4\x3f\x96\x84\x80\x12\x92\xae\xcd"},
{ "draft-stenberg-ipsec-nat-traversal-01", 0, FALSE, 16,
"\x27\xba\xb5\xdc\x01\xea\x07\x60\xea\x4e\x31\x90\xac\x27\xc0\xd0"},
};
/**
* According to racoon 0x80000000 seems to indicate support for fragmentation
* of Aggressive and Main mode messages. 0x40000000 seems to indicate support
* for fragmentation of base ISAKMP messages (Cisco adds that and thus sends
* 0xc0000000)
*/
static const uint32_t fragmentation_ike = 0x80000000;
static bool is_known_vid(chunk_t data, int i)
{
switch (vendor_ids[i].extension)
{
case EXT_IKE_FRAGMENTATION:
if (data.len >= 16 && memeq(data.ptr, vendor_ids[i].id, 16))
{
switch (data.len)
{
case 16:
return TRUE;
case 20:
return untoh32(&data.ptr[16]) & fragmentation_ike;
}
}
break;
case EXT_MS_WINDOWS:
return data.len == 20 && memeq(data.ptr, vendor_ids[i].id, 16);
case EXT_CISCO_UNITY:
return data.len == 16 && memeq(data.ptr, vendor_ids[i].id, 14);
default:
return chunk_equals(data, chunk_create(vendor_ids[i].id,
vendor_ids[i].len));
}
return FALSE;
}
/**
* Add supported vendor ID payloads
*/
static void build(private_isakmp_vendor_t *this, message_t *message)
{
vendor_id_payload_t *vid_payload;
bool strongswan, cisco_unity, fragmentation;
ike_cfg_t *ike_cfg;
int i;
strongswan = lib->settings->get_bool(lib->settings,
"%s.send_vendor_id", FALSE, lib->ns);
cisco_unity = lib->settings->get_bool(lib->settings,
"%s.cisco_unity", FALSE, lib->ns);
ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
fragmentation = ike_cfg->fragmentation(ike_cfg) != FRAGMENTATION_NO;
if (!this->initiator && fragmentation)
{
fragmentation = this->ike_sa->supports_extension(this->ike_sa,
EXT_IKE_FRAGMENTATION);
}
for (i = 0; i < countof(vendor_ids); i++)
{
if (vendor_ids[i].send ||
(vendor_ids[i].extension == EXT_STRONGSWAN && strongswan) ||
(vendor_ids[i].extension == EXT_CISCO_UNITY && cisco_unity) ||
(vendor_ids[i].extension == EXT_IKE_FRAGMENTATION && fragmentation))
{
DBG2(DBG_IKE, "sending %s vendor ID", vendor_ids[i].desc);
vid_payload = vendor_id_payload_create_data(PLV1_VENDOR_ID,
chunk_clone(chunk_create(vendor_ids[i].id, vendor_ids[i].len)));
message->add_payload(message, &vid_payload->payload_interface);
}
}
for (i = 0; i < countof(vendor_natt_ids); i++)
{
if ((this->initiator && vendor_natt_ids[i].send) ||
this->best_natt_ext == i)
{
DBG2(DBG_IKE, "sending %s vendor ID", vendor_natt_ids[i].desc);
vid_payload = vendor_id_payload_create_data(PLV1_VENDOR_ID,
chunk_clone(chunk_create(vendor_natt_ids[i].id,
vendor_natt_ids[i].len)));
message->add_payload(message, &vid_payload->payload_interface);
}
}
}
/**
* Process vendor ID payloads
*/
static void process(private_isakmp_vendor_t *this, message_t *message)
{
enumerator_t *enumerator;
payload_t *payload;
int i;
enumerator = message->create_payload_enumerator(message);
while (enumerator->enumerate(enumerator, &payload))
{
if (payload->get_type(payload) == PLV1_VENDOR_ID)
{
vendor_id_payload_t *vid;
bool found = FALSE;
chunk_t data;
vid = (vendor_id_payload_t*)payload;
data = vid->get_data(vid);
for (i = 0; i < countof(vendor_ids); i++)
{
if (is_known_vid(data, i))
{
DBG1(DBG_IKE, "received %s vendor ID", vendor_ids[i].desc);
if (vendor_ids[i].extension)
{
this->ike_sa->enable_extension(this->ike_sa,
vendor_ids[i].extension);
}
found = TRUE;
break;
}
}
if (!found)
{
for (i = 0; i < countof(vendor_natt_ids); i++)
{
if (chunk_equals(data, chunk_create(vendor_natt_ids[i].id,
vendor_natt_ids[i].len)))
{
DBG1(DBG_IKE, "received %s vendor ID",
vendor_natt_ids[i].desc);
if (vendor_natt_ids[i].extension &&
(i < this->best_natt_ext || this->best_natt_ext < 0))
{
this->best_natt_ext = i;
}
found = TRUE;
break;
}
}
}
if (!found)
{
DBG1(DBG_ENC, "received unknown vendor ID: %#B", &data);
}
}
}
enumerator->destroy(enumerator);
if (this->best_natt_ext >= 0)
{
this->ike_sa->enable_extension(this->ike_sa,
vendor_natt_ids[this->best_natt_ext].extension);
}
}
METHOD(task_t, build_i, status_t,
private_isakmp_vendor_t *this, message_t *message)
{
if (this->count++ == 0)
{
build(this, message);
}
if (message->get_exchange_type(message) == AGGRESSIVE && this->count > 1)
{
return SUCCESS;
}
return NEED_MORE;
}
METHOD(task_t, process_r, status_t,
private_isakmp_vendor_t *this, message_t *message)
{
this->count++;
process(this, message);
if (message->get_exchange_type(message) == AGGRESSIVE && this->count > 1)
{
return SUCCESS;
}
return NEED_MORE;
}
METHOD(task_t, build_r, status_t,
private_isakmp_vendor_t *this, message_t *message)
{
if (this->count == 1)
{
build(this, message);
}
if (message->get_exchange_type(message) == ID_PROT && this->count > 2)
{
return SUCCESS;
}
return NEED_MORE;
}
METHOD(task_t, process_i, status_t,
private_isakmp_vendor_t *this, message_t *message)
{
process(this, message);
if (message->get_exchange_type(message) == ID_PROT && this->count > 2)
{
return SUCCESS;
}
return NEED_MORE;
}
METHOD(task_t, migrate, void,
private_isakmp_vendor_t *this, ike_sa_t *ike_sa)
{
this->ike_sa = ike_sa;
this->count = 0;
}
METHOD(task_t, get_type, task_type_t,
private_isakmp_vendor_t *this)
{
return TASK_ISAKMP_VENDOR;
}
METHOD(task_t, destroy, void,
private_isakmp_vendor_t *this)
{
free(this);
}
/**
* See header
*/
isakmp_vendor_t *isakmp_vendor_create(ike_sa_t *ike_sa, bool initiator)
{
private_isakmp_vendor_t *this;
INIT(this,
.public = {
.task = {
.migrate = _migrate,
.get_type = _get_type,
.destroy = _destroy,
},
},
.initiator = initiator,
.ike_sa = ike_sa,
.best_natt_ext = -1,
);
if (initiator)
{
this->public.task.build = _build_i;
this->public.task.process = _process_i;
}
else
{
this->public.task.build = _build_r;
this->public.task.process = _process_r;
}
return &this->public;
}
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