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Implemented PB-TNC mutual half-duplex protocol

This commit is contained in:
Andreas Steffen 2015-03-22 01:07:31 +01:00
parent c6aed8aa21
commit 7b4a96b2f7
6 changed files with 143 additions and 35 deletions
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4
NEWS
View File

@ -52,6 +52,10 @@ strongswan-5.3.0
as seen by the TNC server available to all IMVs. This information can be
forwarded to policy enforcement points (e.g. firewalls or routers).
- The new mutual tnccs-20 plugin parameter activates mutual TNC measurements
in PB-TNC half-duplex mode between two endpoints over either a PT-EAP or
PT-TLS transport medium.
strongswan-5.2.2
----------------

1
src/libtnccs/plugins/tnc_imc/tnc_imc_plugin.c
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@ -44,6 +44,7 @@ METHOD(plugin_t, get_features, int,
PLUGIN_CALLBACK(tnc_manager_register, tnc_imc_manager_create),
PLUGIN_PROVIDE(CUSTOM, "imc-manager"),
PLUGIN_DEPENDS(CUSTOM, "tnccs-manager"),
PLUGIN_SDEPEND(CUSTOM, "imv-manager"),
PLUGIN_SDEPEND(CERT_DECODE, CERT_X509),
PLUGIN_SDEPEND(CERT_DECODE, CERT_TRUSTED_PUBKEY),
};

99
src/libtnccs/plugins/tnccs_20/tnccs_20.c
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@ -80,7 +80,7 @@ struct private_tnccs_20_t {
u_int32_t auth_type;
/**
* Mutual TNC measurements
* Mutual PB-TNC protocol enabled
*/
bool mutual;
@ -171,12 +171,12 @@ METHOD(tnccs_t, send_msg, TNC_Result,
METHOD(tls_t, process, status_t,
private_tnccs_20_t *this, void *buf, size_t buflen)
{
chunk_t data;
pb_tnc_batch_t *batch;
bool from_server, mutual;
bool from_server;
status_t status;
chunk_t data;
/* On arrival of first PB-TNC batch create TNC server */
/* On arrival of first batch from TNC client create TNC server */
if (this->is_server && !this->tnc_server)
{
this->tnc_server = tnccs_20_server_create(&this->public, _send_msg,
@ -187,25 +187,40 @@ METHOD(tls_t, process, status_t,
return FAILED;
}
this->tnccs_handler = this->tnc_server;
this->tnccs_handler->begin_handshake(this->tnccs_handler);
this->tnccs_handler->begin_handshake(this->tnccs_handler, FALSE);
}
data = chunk_create(buf, buflen);
DBG1(DBG_TNC, "received TNCCS batch (%u bytes)", data.len);
DBG3(DBG_TNC, "%B", &data);
/* Has a mutual connection been established? */
mutual = this->tnc_client && this->tnc_server;
/* Parse the header of the received PB-TNC batch */
batch = pb_tnc_batch_create_from_data(data);
status = batch->process_header(batch, !mutual, this->is_server,
status = batch->process_header(batch, !this->mutual, this->is_server,
&from_server);
this->to_server = mutual ? from_server : !this->is_server;
/* Set active TNCCS handler */
this->tnccs_handler = this->to_server ? this->tnc_client : this->tnc_server;
DBG2(DBG_TNC, "TNC %s is handling the connection",
this->to_server = this->mutual ? from_server : !this->is_server;
/* In the mutual case, first batch from TNC server requires a TNC client */
if (this->to_server && !this->tnc_client)
{
this->tnc_client = tnccs_20_client_create(&this->public, _send_msg,
this->max_batch_len, this->max_msg_len);
if (!this->tnc_client)
{
batch->destroy(batch);
return FAILED;
}
this->tnccs_handler = this->tnc_client;
this->tnccs_handler->begin_handshake(this->tnccs_handler, this->mutual);
}
else
{
/* Set active TNCCS handler for processing */
this->tnccs_handler = this->to_server ? this->tnc_client :
this->tnc_server;
}
DBG2(DBG_TNC, "TNC %s is handling inbound connection",
this->to_server ? "client" : "server");
if (status == SUCCESS)
@ -219,6 +234,40 @@ METHOD(tls_t, process, status_t,
}
batch->destroy(batch);
/* Has a mutual connection been established? */
this->mutual = this->is_server ?
this->tnc_server->get_mutual(this->tnc_server) :
this->tnc_client->get_mutual(this->tnc_client);
if (this->mutual && !this->is_server)
{
pb_tnc_state_t client_state, server_state;
client_state = !this->tnc_client ? PB_STATE_INIT :
this->tnc_client->get_state(this->tnc_client);
server_state = !this->tnc_server ? PB_STATE_INIT :
this->tnc_server->get_state(this->tnc_server);
/* In half-duplex mutual mode toggle the direction on the client side */
if ((!this->to_server && client_state != PB_STATE_DECIDED) ||
( this->to_server && server_state != PB_STATE_END))
{
this->to_server = !this->to_server;
}
else if (client_state == PB_STATE_DECIDED &&
server_state == PB_STATE_END)
{
/* Cause the final CLOSE batch to be sent to the TNC server */
this->to_server = TRUE;
}
/* Suppress a successful CLOSE batch coming from the TNC server */
if (status == SUCCESS)
{
status = NEED_MORE;
}
}
return status;
}
@ -229,10 +278,15 @@ METHOD(tls_t, build, status_t,
if (this->to_server)
{
DBG2(DBG_TNC, "TNC client is handling outbound connection");
/* Before sending the first PB-TNC batch create TNC client */
if (!this->tnc_client)
if (this->tnc_client)
{
this->tnccs_handler = this->tnc_client;
}
else
{
DBG2(DBG_TNC, "TNC client is handling the connection");
this->tnc_client = tnccs_20_client_create(&this->public, _send_msg,
this->max_batch_len,
this->max_msg_len);
@ -241,15 +295,21 @@ METHOD(tls_t, build, status_t,
status = FAILED;
}
this->tnccs_handler = this->tnc_client;
this->tnccs_handler->begin_handshake(this->tnccs_handler);
this->tnccs_handler->begin_handshake(this->tnccs_handler,
this->mutual);
}
}
else
{
DBG2(DBG_TNC, "TNC server is handling outbound connection");
/* Before sending the first PB-TNC batch create TNC server */
if (!this->tnc_server)
if (this->tnc_server)
{
this->tnccs_handler = this->tnc_server;
}
else
{
DBG2(DBG_TNC, "TNC server is handling the connection");
this->tnc_server = tnccs_20_server_create(&this->public, _send_msg,
this->max_batch_len, this->max_msg_len,
this->eap_transport);
@ -258,7 +318,8 @@ METHOD(tls_t, build, status_t,
status = FAILED;
}
this->tnccs_handler = this->tnc_server;
this->tnccs_handler->begin_handshake(this->tnccs_handler);
this->tnccs_handler->begin_handshake(this->tnccs_handler,
this->mutual);
}
}
status = this->tnccs_handler->build(this->tnccs_handler, buf, buflen, msglen);

34
src/libtnccs/plugins/tnccs_20/tnccs_20_client.c
View File

@ -110,6 +110,11 @@ struct private_tnccs_20_client_t {
*/
bool mutual;
/**
* Mutual Capability message sent
*/
bool sent_mutual_capability;
};
/**
@ -166,20 +171,29 @@ void tnccs_20_handle_ietf_error_msg(pb_tnc_msg_t *msg, bool *fatal_error)
}
}
void tnccs_20_handle_ita_mutual_capability_msg(pb_tnc_msg_t *msg, bool *mutual)
bool tnccs_20_handle_ita_mutual_capability_msg(pb_tnc_msg_t *msg)
{
pb_mutual_capability_msg_t *mutual_msg;
uint32_t protocols;
if (!lib->settings->get_bool(lib->settings,
"%s.plugins.tnccs-20.mutual", FALSE, lib->ns))
{
/* PB-TNC mutual capability disabled, ignore message */
return FALSE;
}
mutual_msg = (pb_mutual_capability_msg_t*)msg;
protocols = mutual_msg->get_protocols(mutual_msg);
if (protocols & PB_MUTUAL_HALF_DUPLEX)
{
*mutual = TRUE;
DBG1(DBG_TNC, "activating mutual PB-TNC %N protocol",
pb_tnc_mutual_protocol_type_names, PB_MUTUAL_HALF_DUPLEX);
return TRUE;
}
return FALSE;
}
/**
@ -396,7 +410,7 @@ static void handle_ita_message(private_tnccs_20_client_t *this, pb_tnc_msg_t *ms
switch (msg_type.type)
{
case PB_ITA_MSG_MUTUAL_CAPABILITY:
tnccs_20_handle_ita_mutual_capability_msg(msg, &this->mutual);
this->mutual = tnccs_20_handle_ita_mutual_capability_msg(msg);
break;
default:
break;
@ -636,7 +650,7 @@ METHOD(tnccs_20_handler_t, build, status_t,
}
METHOD(tnccs_20_handler_t, begin_handshake, void,
private_tnccs_20_client_t *this)
private_tnccs_20_client_t *this, bool mutual)
{
pb_tnc_msg_t *msg;
char *pref_lang;
@ -645,7 +659,9 @@ METHOD(tnccs_20_handler_t, begin_handshake, void,
TNC_CONNECTION_STATE_HANDSHAKE);
/* Announce PB-TNC Mutual Capability if activated */
if (lib->settings->get_bool(lib->settings,
this->sent_mutual_capability = mutual;
if (!mutual && lib->settings->get_bool(lib->settings,
"%s.plugins.tnccs-20.mutual", FALSE, lib->ns))
{
pb_tnc_mutual_protocol_type_t protocols;
@ -657,6 +673,7 @@ METHOD(tnccs_20_handler_t, begin_handshake, void,
this->mutex->lock(this->mutex);
this->messages->insert_last(this->messages, msg);
this->mutex->unlock(this->mutex);
this->sent_mutual_capability = TRUE;
}
/* Create PB-TNC Language Preference message */
@ -684,6 +701,12 @@ METHOD(tnccs_20_handler_t, get_mutual, bool,
return this->mutual;
}
METHOD(tnccs_20_handler_t, get_state, pb_tnc_state_t,
private_tnccs_20_client_t *this)
{
return this->state_machine->get_state(this->state_machine);
}
METHOD(tnccs_20_handler_t, add_msg, void,
private_tnccs_20_client_t *this, pb_tnc_msg_t *msg)
{
@ -761,6 +784,7 @@ tnccs_20_handler_t* tnccs_20_client_create(tnccs_t *tnccs,
.begin_handshake = _begin_handshake,
.get_send_flag = _get_send_flag,
.get_mutual = _get_mutual,
.get_state = _get_state,
.add_msg = _add_msg,
.handle_errors = _handle_errors,
.destroy = _destroy,

11
src/libtnccs/plugins/tnccs_20/tnccs_20_handler.h
View File

@ -54,8 +54,10 @@ struct tnccs_20_handler_t {
/**
* Put the IMCs or IMVs into the handshake state
*
* @param mutual TRUE if PB-TNC mutual mode is already established
*/
void (*begin_handshake)(tnccs_20_handler_t *this);
void (*begin_handshake)(tnccs_20_handler_t *this, bool mutual);
/**
* Indicates if IMCs or IMVs are allowed to send PA-TNC messages
@ -71,6 +73,13 @@ struct tnccs_20_handler_t {
*/
bool (*get_mutual)(tnccs_20_handler_t *this);
/**
* Get state of the PB-TNC protocol
*
* @return PB-TNC state
*/
pb_tnc_state_t (*get_state)(tnccs_20_handler_t *this);
/**
* Add a PB-PA message to the handler's message queue
*

29
src/libtnccs/plugins/tnccs_20/tnccs_20_server.c
View File

@ -110,6 +110,11 @@ struct private_tnccs_20_server_t {
*/
bool mutual;
/**
* Mutual Capability message sent
*/
bool sent_mutual_capability;
};
/**
@ -117,8 +122,7 @@ struct private_tnccs_20_server_t {
*/
extern void tnccs_20_handle_ietf_error_msg(pb_tnc_msg_t *msg,
bool *fatal_error);
extern void tnccs_20_handle_ita_mutual_capability_msg(pb_tnc_msg_t *msg,
bool *mutual);
extern bool tnccs_20_handle_ita_mutual_capability_msg(pb_tnc_msg_t *msg);
/**
* If the batch type changes then delete all accumulated PB-TNC messages
@ -224,18 +228,16 @@ static void handle_ita_message(private_tnccs_20_server_t *this, pb_tnc_msg_t *ms
switch (msg_type.type)
{
case PB_ITA_MSG_MUTUAL_CAPABILITY:
tnccs_20_handle_ita_mutual_capability_msg(msg, &this->mutual);
this->mutual = tnccs_20_handle_ita_mutual_capability_msg(msg);
/* Respond with PB-TNC Mutual Capability message if activated */
if (this->mutual && lib->settings->get_bool(lib->settings,
"%s.plugins.tnccs-20.mutual", FALSE, lib->ns))
/* Respond with PB-TNC Mutual Capability message if necessary */
if (this->mutual && !this->sent_mutual_capability)
{
pb_tnc_mutual_protocol_type_t protocols = PB_MUTUAL_HALF_DUPLEX;
msg = pb_mutual_capability_msg_create(protocols);
msg = pb_mutual_capability_msg_create(PB_MUTUAL_HALF_DUPLEX);
this->mutex->lock(this->mutex);
this->messages->insert_last(this->messages, msg);
this->mutex->unlock(this->mutex);
this->sent_mutual_capability = TRUE;
}
break;
default:
@ -537,7 +539,7 @@ METHOD(tnccs_20_handler_t, build, status_t,
}
METHOD(tnccs_20_handler_t, begin_handshake, void,
private_tnccs_20_server_t *this)
private_tnccs_20_server_t *this, bool mutual)
{
pb_tnc_msg_t *msg;
identification_t *pdp_server;
@ -572,6 +574,12 @@ METHOD(tnccs_20_handler_t, get_mutual, bool,
return this->mutual;
}
METHOD(tnccs_20_handler_t, get_state, pb_tnc_state_t,
private_tnccs_20_server_t *this)
{
return this->state_machine->get_state(this->state_machine);
}
METHOD(tnccs_20_handler_t, add_msg, void,
private_tnccs_20_server_t *this, pb_tnc_msg_t *msg)
{
@ -648,6 +656,7 @@ tnccs_20_handler_t* tnccs_20_server_create(tnccs_t *tnccs,
.begin_handshake = _begin_handshake,
.get_send_flag = _get_send_flag,
.get_mutual = _get_mutual,
.get_state = _get_state,
.add_msg = _add_msg,
.handle_errors = _handle_errors,
.destroy = _destroy,