/*
* Copyright (C) 2011-2015 Andreas Steffen
* 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 "imcv.h"
#include "imv_agent.h"
#include "imv_session.h"
#include "ietf/ietf_attr_assess_result.h"
#include <tncif_names.h>
#include <tncif_identity.h>
#include <utils/debug.h>
#include <collections/linked_list.h>
#include <bio/bio_reader.h>
#include <threading/rwlock.h>
typedef struct private_imv_agent_t private_imv_agent_t;
/**
* Private data of an imv_agent_t object.
*/
struct private_imv_agent_t {
/**
* Public members of imv_agent_t
*/
imv_agent_t public;
/**
* name of IMV
*/
const char *name;
/**
* message types registered by IMV
*/
pen_type_t *supported_types;
/**
* number of message types registered by IMV
*/
uint32_t type_count;
/**
* ID of IMV as assigned by TNCS
*/
TNC_IMVID id;
/**
* List of additional IMV IDs assigned by TNCS
*/
linked_list_t *additional_ids;
/**
* list of non-fatal unsupported PA-TNC attribute types
*/
linked_list_t *non_fatal_attr_types;
/**
* list of TNCS connection entries
*/
linked_list_t *connections;
/**
* rwlock to lock TNCS connection entries
*/
rwlock_t *connection_lock;
/**
* Inform a TNCS about the set of message types the IMV is able to receive
*
* @param imv_id IMV ID assigned by TNCS
* @param supported_types list of supported message types
* @param type_count number of list elements
* @return TNC result code
*/
TNC_Result (*report_message_types)(TNC_IMVID imv_id,
TNC_MessageTypeList supported_types,
TNC_UInt32 type_count);
/**
* Inform a TNCS about the set of message types the IMV is able to receive
*
* @param imv_id IMV ID assigned by TNCS
* @param supported_vids list of supported message vendor IDs
* @param supported_subtypes list of supported message subtypes
* @param type_count number of list elements
* @return TNC result code
*/
TNC_Result (*report_message_types_long)(TNC_IMVID imv_id,
TNC_VendorIDList supported_vids,
TNC_MessageSubtypeList supported_subtypes,
TNC_UInt32 type_count);
/**
* Deliver IMV Action Recommendation and IMV Evaluation Results to the TNCS
*
* @param imv_id IMV ID assigned by TNCS
# @param connection_id network connection ID assigned by TNCS
* @param rec IMV action recommendation
* @param eval IMV evaluation result
* @return TNC result code
*/
TNC_Result (*provide_recommendation)(TNC_IMVID imv_id,
TNC_ConnectionID connection_id,
TNC_IMV_Action_Recommendation rec,
TNC_IMV_Evaluation_Result eval);
/**
* Get the value of an attribute associated with a connection
* or with the TNCS as a whole.
*
* @param imv_id IMV ID assigned by TNCS
* @param connection_id network connection ID assigned by TNCS
* @param attribute_id attribute ID
* @param buffer_len length of buffer in bytes
* @param buffer buffer
* @param out_value_len size in bytes of attribute stored in buffer
* @return TNC result code
*/
TNC_Result (*get_attribute)(TNC_IMVID imv_id,
TNC_ConnectionID connection_id,
TNC_AttributeID attribute_id,
TNC_UInt32 buffer_len,
TNC_BufferReference buffer,
TNC_UInt32 *out_value_len);
/**
* Set the value of an attribute associated with a connection
* or with the TNCS as a whole.
*
* @param imv_id IMV ID assigned by TNCS
* @param connection_id network connection ID assigned by TNCS
* @param attribute_id attribute ID
* @param buffer_len length of buffer in bytes
* @param buffer buffer
* @return TNC result code
*/
TNC_Result (*set_attribute)(TNC_IMVID imv_id,
TNC_ConnectionID connection_id,
TNC_AttributeID attribute_id,
TNC_UInt32 buffer_len,
TNC_BufferReference buffer);
/**
* Reserve an additional IMV ID
*
* @param imv_id primary IMV ID assigned by TNCS
* @param out_imv_id additional IMV ID assigned by TNCS
* @return TNC result code
*/
TNC_Result (*reserve_additional_id)(TNC_IMVID imv_id,
TNC_UInt32 *out_imv_id);
};
METHOD(imv_agent_t, bind_functions, TNC_Result,
private_imv_agent_t *this, TNC_TNCS_BindFunctionPointer bind_function)
{
if (!bind_function)
{
DBG1(DBG_IMV, "TNC server failed to provide bind function");
return TNC_RESULT_INVALID_PARAMETER;
}
if (bind_function(this->id, "TNC_TNCS_ReportMessageTypes",
(void**)&this->report_message_types) != TNC_RESULT_SUCCESS)
{
this->report_message_types = NULL;
}
if (bind_function(this->id, "TNC_TNCS_ReportMessageTypesLong",
(void**)&this->report_message_types_long) != TNC_RESULT_SUCCESS)
{
this->report_message_types_long = NULL;
}
if (bind_function(this->id, "TNC_TNCS_RequestHandshakeRetry",
(void**)&this->public.request_handshake_retry) != TNC_RESULT_SUCCESS)
{
this->public.request_handshake_retry = NULL;
}
if (bind_function(this->id, "TNC_TNCS_SendMessage",
(void**)&this->public.send_message) != TNC_RESULT_SUCCESS)
{
this->public.send_message = NULL;
}
if (bind_function(this->id, "TNC_TNCS_SendMessageLong",
(void**)&this->public.send_message_long) != TNC_RESULT_SUCCESS)
{
this->public.send_message_long = NULL;
}
if (bind_function(this->id, "TNC_TNCS_ProvideRecommendation",
(void**)&this->provide_recommendation) != TNC_RESULT_SUCCESS)
{
this->provide_recommendation = NULL;
}
if (bind_function(this->id, "TNC_TNCS_GetAttribute",
(void**)&this->get_attribute) != TNC_RESULT_SUCCESS)
{
this->get_attribute = NULL;
}
if (bind_function(this->id, "TNC_TNCS_SetAttribute",
(void**)&this->set_attribute) != TNC_RESULT_SUCCESS)
{
this->set_attribute = NULL;
}
if (bind_function(this->id, "TNC_TNCC_ReserveAdditionalIMVID",
(void**)&this->reserve_additional_id) != TNC_RESULT_SUCCESS)
{
this->reserve_additional_id = NULL;
}
if (this->report_message_types_long)
{
TNC_VendorIDList vendor_id_list;
TNC_MessageSubtypeList subtype_list;
int i;
vendor_id_list = malloc(this->type_count * sizeof(TNC_UInt32));
subtype_list = malloc(this->type_count * sizeof(TNC_UInt32));
for (i = 0; i < this->type_count; i++)
{
vendor_id_list[i] = this->supported_types[i].vendor_id;
subtype_list[i] = this->supported_types[i].type;
}
this->report_message_types_long(this->id, vendor_id_list, subtype_list,
this->type_count);
free(vendor_id_list);
free(subtype_list);
}
else if (this->report_message_types)
{
TNC_MessageTypeList type_list;
int i;
type_list = malloc(this->type_count * sizeof(TNC_UInt32));
for (i = 0; i < this->type_count; i++)
{
type_list[i] = (this->supported_types[i].vendor_id << 8) |
(this->supported_types[i].type & 0xff);
}
this->report_message_types(this->id, type_list, this->type_count);
free(type_list);
}
return TNC_RESULT_SUCCESS;
}
/**
* finds a connection state based on its Connection ID
*/
static imv_state_t* find_connection(private_imv_agent_t *this,
TNC_ConnectionID id)
{
enumerator_t *enumerator;
imv_state_t *state, *found = NULL;
this->connection_lock->read_lock(this->connection_lock);
enumerator = this->connections->create_enumerator(this->connections);
while (enumerator->enumerate(enumerator, &state))
{
if (id == state->get_connection_id(state))
{
found = state;
break;
}
}
enumerator->destroy(enumerator);
this->connection_lock->unlock(this->connection_lock);
return found;
}
/**
* delete a connection state with a given Connection ID
*/
static bool delete_connection(private_imv_agent_t *this, TNC_ConnectionID id)
{
enumerator_t *enumerator;
imv_state_t *state;
imv_session_t *session;
bool found = FALSE;
this->connection_lock->write_lock(this->connection_lock);
enumerator = this->connections->create_enumerator(this->connections);
while (enumerator->enumerate(enumerator, &state))
{
if (id == state->get_connection_id(state))
{
found = TRUE;
session = state->get_session(state);
imcv_sessions->remove_session(imcv_sessions, session);
state->destroy(state);
this->connections->remove_at(this->connections, enumerator);
break;
}
}
enumerator->destroy(enumerator);
this->connection_lock->unlock(this->connection_lock);
return found;
}
/**
* Read a boolean attribute
*/
static bool get_bool_attribute(private_imv_agent_t *this, TNC_ConnectionID id,
TNC_AttributeID attribute_id)
{
TNC_UInt32 len;
char buf[4];
return this->get_attribute &&
this->get_attribute(this->id, id, attribute_id, 4, buf, &len) ==
TNC_RESULT_SUCCESS && len == 1 && *buf == 0x01;
}
/**
* Read a string attribute
*/
static char* get_str_attribute(private_imv_agent_t *this, TNC_ConnectionID id,
TNC_AttributeID attribute_id)
{
TNC_UInt32 len;
char buf[BUF_LEN];
if (this->get_attribute &&
this->get_attribute(this->id, id, attribute_id, BUF_LEN, buf, &len) ==
TNC_RESULT_SUCCESS && len <= BUF_LEN)
{
return strdup(buf);
}
return NULL;
}
/**
* Read an UInt32 attribute
*/
static uint32_t get_uint_attribute(private_imv_agent_t *this, TNC_ConnectionID id,
TNC_AttributeID attribute_id)
{
TNC_UInt32 len;
char buf[4];
if (this->get_attribute &&
this->get_attribute(this->id, id, attribute_id, 4, buf, &len) ==
TNC_RESULT_SUCCESS && len == 4)
{
return untoh32(buf);
}
return 0;
}
/**
* Read a TNC identity attribute
*/
static linked_list_t* get_identity_attribute(private_imv_agent_t *this,
TNC_ConnectionID id,
TNC_AttributeID attribute_id)
{
TNC_UInt32 len;
char buf[2048];
uint32_t count;
tncif_identity_t *tnc_id;
bio_reader_t *reader;
linked_list_t *list;
list = linked_list_create();
if (!this->get_attribute ||
this->get_attribute(this->id, id, attribute_id, sizeof(buf), buf, &len)
!= TNC_RESULT_SUCCESS || len > sizeof(buf))
{
return list;
}
reader = bio_reader_create(chunk_create(buf, len));
if (!reader->read_uint32(reader, &count))
{
goto end;
}
while (count--)
{
tnc_id = tncif_identity_create_empty();
if (!tnc_id->process(tnc_id, reader))
{
tnc_id->destroy(tnc_id);
goto end;
}
list->insert_last(list, tnc_id);
}
end:
reader->destroy(reader);
return list;
}
METHOD(imv_agent_t, create_state, TNC_Result,
private_imv_agent_t *this, imv_state_t *state)
{
TNC_ConnectionID conn_id;
char *tnccs_p = NULL, *tnccs_v = NULL, *t_p = NULL, *t_v = NULL;
bool has_long = FALSE, has_excl = FALSE, has_soh = FALSE;
linked_list_t *ar_identities;
imv_session_t *session;
uint32_t max_msg_len;
conn_id = state->get_connection_id(state);
if (find_connection(this, conn_id))
{
DBG1(DBG_IMV, "IMV %u \"%s\" already created a state for Connection ID %u",
this->id, this->name, conn_id);
state->destroy(state);
return TNC_RESULT_OTHER;
}
/* Get and display attributes from TNCS via IF-IMV */
has_long = get_bool_attribute(this, conn_id,
TNC_ATTRIBUTEID_HAS_LONG_TYPES);
has_excl = get_bool_attribute(this, conn_id,
TNC_ATTRIBUTEID_HAS_EXCLUSIVE);
has_soh = get_bool_attribute(this, conn_id,
TNC_ATTRIBUTEID_HAS_SOH);
tnccs_p = get_str_attribute(this, conn_id,
TNC_ATTRIBUTEID_IFTNCCS_PROTOCOL);
tnccs_v = get_str_attribute(this, conn_id,
TNC_ATTRIBUTEID_IFTNCCS_VERSION);
t_p = get_str_attribute(this, conn_id,
TNC_ATTRIBUTEID_IFT_PROTOCOL);
t_v = get_str_attribute(this, conn_id,
TNC_ATTRIBUTEID_IFT_VERSION);
max_msg_len = get_uint_attribute(this, conn_id,
TNC_ATTRIBUTEID_MAX_MESSAGE_SIZE);
ar_identities = get_identity_attribute(this, conn_id,
TNC_ATTRIBUTEID_AR_IDENTITIES);
state->set_flags(state, has_long, has_excl);
state->set_max_msg_len(state, max_msg_len);
DBG2(DBG_IMV, "IMV %u \"%s\" created a state for %s %s Connection ID %u: "
"%slong %sexcl %ssoh", this->id, this->name,
tnccs_p ? tnccs_p:"?", tnccs_v ? tnccs_v:"?", conn_id,
has_long ? "+":"-", has_excl ? "+":"-", has_soh ? "+":"-");
DBG2(DBG_IMV, " over %s %s with maximum PA-TNC message size of %u bytes",
t_p ? t_p:"?", t_v ? t_v :"?", max_msg_len);
session = imcv_sessions->add_session(imcv_sessions, conn_id, ar_identities);
state->set_session(state, session);
free(tnccs_p);
free(tnccs_v);
free(t_p);
free(t_v);
/* insert state in connection list */
this->connection_lock->write_lock(this->connection_lock);
this->connections->insert_last(this->connections, state);
this->connection_lock->unlock(this->connection_lock);
return TNC_RESULT_SUCCESS;
}
METHOD(imv_agent_t, delete_state, TNC_Result,
private_imv_agent_t *this, TNC_ConnectionID connection_id)
{
if (!delete_connection(this, connection_id))
{
DBG1(DBG_IMV, "IMV %u \"%s\" has no state for Connection ID %u",
this->id, this->name, connection_id);
return TNC_RESULT_FATAL;
}
DBG2(DBG_IMV, "IMV %u \"%s\" deleted the state of Connection ID %u",
this->id, this->name, connection_id);
return TNC_RESULT_SUCCESS;
}
METHOD(imv_agent_t, change_state, TNC_Result,
private_imv_agent_t *this, TNC_ConnectionID connection_id,
TNC_ConnectionState new_state,
imv_state_t **state_p)
{
imv_state_t *state;
TNC_ConnectionState old_state;
switch (new_state)
{
case TNC_CONNECTION_STATE_HANDSHAKE:
case TNC_CONNECTION_STATE_ACCESS_ALLOWED:
case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
case TNC_CONNECTION_STATE_ACCESS_NONE:
state = find_connection(this, connection_id);
if (!state)
{
DBG1(DBG_IMV, "IMV %u \"%s\" has no state for Connection ID %u",
this->id, this->name, connection_id);
return TNC_RESULT_FATAL;
}
old_state = state->change_state(state, new_state);
DBG2(DBG_IMV, "IMV %u \"%s\" changed state of Connection ID %u to '%N'",
this->id, this->name, connection_id,
TNC_Connection_State_names, new_state);
if (state_p)
{
*state_p = state;
}
if (new_state == TNC_CONNECTION_STATE_HANDSHAKE &&
old_state != TNC_CONNECTION_STATE_CREATE)
{
state->reset(state);
DBG2(DBG_IMV, "IMV %u \"%s\" reset state of Connection ID %u",
this->id, this->name, connection_id);
}
break;
case TNC_CONNECTION_STATE_CREATE:
DBG1(DBG_IMV, "state '%N' should be handled by create_state()",
TNC_Connection_State_names, new_state);
return TNC_RESULT_FATAL;
case TNC_CONNECTION_STATE_DELETE:
DBG1(DBG_IMV, "state '%N' should be handled by delete_state()",
TNC_Connection_State_names, new_state);
return TNC_RESULT_FATAL;
default:
DBG1(DBG_IMV, "IMV %u \"%s\" was notified of unknown state %u "
"for Connection ID %u",
this->id, this->name, new_state, connection_id);
return TNC_RESULT_INVALID_PARAMETER;
}
return TNC_RESULT_SUCCESS;
}
METHOD(imv_agent_t, get_state, bool,
private_imv_agent_t *this, TNC_ConnectionID connection_id,
imv_state_t **state)
{
*state = find_connection(this, connection_id);
if (!*state)
{
DBG1(DBG_IMV, "IMV %u \"%s\" has no state for Connection ID %u",
this->id, this->name, connection_id);
return FALSE;
}
return TRUE;
}
METHOD(imv_agent_t, get_name, const char*,
private_imv_agent_t *this)
{
return this->name;
}
METHOD(imv_agent_t, get_id, TNC_IMVID,
private_imv_agent_t *this)
{
return this->id;
}
METHOD(imv_agent_t, reserve_additional_ids, TNC_Result,
private_imv_agent_t *this, int count)
{
TNC_Result result;
TNC_UInt32 id;
void *pointer;
if (!this->reserve_additional_id)
{
DBG1(DBG_IMV, "IMV %u \"%s\" did not detect the capability to reserve "
"additional IMV IDs from the TNCS", this->id, this->name);
return TNC_RESULT_ILLEGAL_OPERATION;
}
while (count > 0)
{
result = this->reserve_additional_id(this->id, &id);
if (result != TNC_RESULT_SUCCESS)
{
DBG1(DBG_IMV, "IMV %u \"%s\" failed to reserve %d additional IMV IDs",
this->id, this->name, count);
return result;
}
count--;
/* store the scalar value in the pointer */
pointer = (void*)(uintptr_t)id;
this->additional_ids->insert_last(this->additional_ids, pointer);
DBG2(DBG_IMV, "IMV %u \"%s\" reserved additional ID %u",
this->id, this->name, id);
}
return TNC_RESULT_SUCCESS;
}
METHOD(imv_agent_t, count_additional_ids, int,
private_imv_agent_t *this)
{
return this->additional_ids->get_count(this->additional_ids);
}
METHOD(imv_agent_t, create_id_enumerator, enumerator_t*,
private_imv_agent_t *this)
{
return this->additional_ids->create_enumerator(this->additional_ids);
}
typedef struct {
/**
* implements enumerator_t
*/
enumerator_t public;
/**
* language length
*/
TNC_UInt32 lang_len;
/**
* language buffer
*/
char lang_buf[BUF_LEN];
/**
* position pointer into language buffer
*/
char *lang_pos;
} language_enumerator_t;
METHOD(enumerator_t, language_enumerator_enumerate, bool,
language_enumerator_t *this, va_list args)
{
char *pos, *cur_lang, **lang;
TNC_UInt32 len;
VA_ARGS_VGET(args, lang);
if (!this->lang_len)
{
return FALSE;
}
cur_lang = this->lang_pos;
pos = strchr(this->lang_pos, ',');
if (pos)
{
len = pos - this->lang_pos;
this->lang_pos += len + 1;
this->lang_len -= len + 1;
}
else
{
len = this->lang_len;
pos = this->lang_pos + len;
this->lang_pos = NULL;
this->lang_len = 0;
}
/* remove preceding whitespace */
while (*cur_lang == ' ' && len--)
{
cur_lang++;
}
/* remove trailing whitespace */
while (len && *(--pos) == ' ')
{
len--;
}
cur_lang[len] = '\0';
*lang = cur_lang;
return TRUE;
}
METHOD(imv_agent_t, create_language_enumerator, enumerator_t*,
private_imv_agent_t *this, imv_state_t *state)
{
language_enumerator_t *e;
INIT(e,
.public = {
.enumerate = enumerator_enumerate_default,
.venumerate = _language_enumerator_enumerate,
.destroy = (void*)free,
},
);
if (!this->get_attribute ||
this->get_attribute(this->id, state->get_connection_id(state),
TNC_ATTRIBUTEID_PREFERRED_LANGUAGE, BUF_LEN,
e->lang_buf, &e->lang_len) != TNC_RESULT_SUCCESS ||
e->lang_len >= BUF_LEN)
{
e->lang_len = 0;
}
e->lang_buf[e->lang_len] = '\0';
e->lang_pos = e->lang_buf;
return (enumerator_t*)e;
}
METHOD(imv_agent_t, provide_recommendation, TNC_Result,
private_imv_agent_t *this, imv_state_t *state)
{
TNC_IMV_Action_Recommendation rec;
TNC_IMV_Evaluation_Result eval;
TNC_ConnectionID connection_id;
chunk_t reason_string;
char *reason_lang;
enumerator_t *e;
state->get_recommendation(state, &rec, &eval);
connection_id = state->get_connection_id(state);
/* send a reason string if action recommendation is not allow */
if (rec != TNC_IMV_ACTION_RECOMMENDATION_ALLOW)
{
/* find a reason string for the preferred language and set it */
if (this->set_attribute)
{
e = create_language_enumerator(this, state);
if (state->get_reason_string(state, e, &reason_string, &reason_lang))
{
this->set_attribute(this->id, connection_id,
TNC_ATTRIBUTEID_REASON_STRING,
reason_string.len, reason_string.ptr);
this->set_attribute(this->id, connection_id,
TNC_ATTRIBUTEID_REASON_LANGUAGE,
strlen(reason_lang), reason_lang);
}
e->destroy(e);
}
}
return this->provide_recommendation(this->id, connection_id, rec, eval);
}
METHOD(imv_agent_t, add_non_fatal_attr_type, void,
private_imv_agent_t *this, pen_type_t type)
{
pen_type_t *type_p;
type_p = malloc_thing(pen_type_t);
*type_p = type;
this->non_fatal_attr_types->insert_last(this->non_fatal_attr_types, type_p);
}
METHOD(imv_agent_t, get_non_fatal_attr_types, linked_list_t*,
private_imv_agent_t *this)
{
return this->non_fatal_attr_types;
}
METHOD(imv_agent_t, destroy, void,
private_imv_agent_t *this)
{
DBG1(DBG_IMV, "IMV %u \"%s\" terminated", this->id, this->name);
this->additional_ids->destroy(this->additional_ids);
this->non_fatal_attr_types->destroy_function(this->non_fatal_attr_types,
free);
this->connections->destroy_offset(this->connections,
offsetof(imv_state_t, destroy));
this->connection_lock->destroy(this->connection_lock);
free(this);
/* decrease the reference count or terminate */
libimcv_deinit();
}
/**
* Described in header.
*/
imv_agent_t *imv_agent_create(const char *name,
pen_type_t *supported_types, uint32_t type_count,
TNC_IMVID id, TNC_Version *actual_version)
{
private_imv_agent_t *this;
/* initialize or increase the reference count */
if (!libimcv_init(TRUE))
{
return NULL;
}
INIT(this,
.public = {
.bind_functions = _bind_functions,
.create_state = _create_state,
.delete_state = _delete_state,
.change_state = _change_state,
.get_state = _get_state,
.get_name = _get_name,
.get_id = _get_id,
.reserve_additional_ids = _reserve_additional_ids,
.count_additional_ids = _count_additional_ids,
.create_id_enumerator = _create_id_enumerator,
.create_language_enumerator = _create_language_enumerator,
.provide_recommendation = _provide_recommendation,
.add_non_fatal_attr_type = _add_non_fatal_attr_type,
.get_non_fatal_attr_types = _get_non_fatal_attr_types,
.destroy = _destroy,
},
.name = name,
.supported_types = supported_types,
.type_count = type_count,
.id = id,
.additional_ids = linked_list_create(),
.non_fatal_attr_types = linked_list_create(),
.connections = linked_list_create(),
.connection_lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
);
*actual_version = TNC_IFIMV_VERSION_1;
DBG1(DBG_IMV, "IMV %u \"%s\" initialized", this->id, this->name);
return &this->public;
}
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