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mbed-os/connectivity/FEATURE_BLE/source/generic/SecurityManagerImpl.h

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/* mbed Microcontroller Library
* Copyright (c) 2006-2020 ARM Limited
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef IMPL_SECURITY_MANAGER_H_
#define IMPL_SECURITY_MANAGER_H_
#include <cstdint>
#include "platform/Callback.h"
#include "ble/Gap.h"
#include "ble/SecurityManager.h"
#include "ble/common/CallChainOfFunctionPointersWithContext.h"
#include "ble/common/BLETypes.h"
#include "ble/common/blecommon.h"
#include "ble/common/BLETypes.h"
#include "source/pal/GapTypes.h"
#include "source/pal/PalConnectionMonitor.h"
#if BLE_FEATURE_SIGNING
#include "source/pal/PalSigningMonitor.h"
#endif //BLE_FEATURE_SIGNING
#include "source/pal/PalSecurityManager.h"
#include "source/generic/SecurityDb.h"
#include "source/generic/PrivateAddressController.h"
namespace ble {
class PalGenericAccessService;
namespace impl {
class SecurityManager :
public ble::PalSecurityManagerEventHandler,
public ble::PalConnectionMonitorEventHandler
#if BLE_FEATURE_SIGNING
, public ble::PalSigningMonitorEventHandler
#endif // BLE_FEATURE_SIGNING
{
friend class ble::PalConnectionMonitorEventHandler;
friend PalGenericAccessService;
friend PalSecurityManager;
using SecurityIOCapabilities_t = ble::SecurityManager::SecurityIOCapabilities_t;
using SecurityMode_t = ble::SecurityManager::SecurityMode_t;
using SecurityManagerShutdownCallback_t = ble::SecurityManager::SecurityManagerShutdownCallback_t;
using SecurityManagerShutdownCallbackChain_t = ble::SecurityManager::SecurityManagerShutdownCallbackChain_t;
using EventHandler = ble::SecurityManager::EventHandler;
using Passkey_t = ble::SecurityManager::Passkey_t ;
static auto constexpr IO_CAPS_NONE = ble::SecurityManager::IO_CAPS_NONE;
public:
////////////////////////////////////////////////////////////////////////////
// SM lifecycle management
//
ble_error_t init(
bool enableBonding = true,
bool requireMITM = true,
SecurityIOCapabilities_t iocaps = IO_CAPS_NONE,
const Passkey_t passkey = nullptr,
bool signing = true,
const char *dbFilepath = nullptr
);
ble_error_t setDatabaseFilepath(const char *dbFilepath = nullptr);
ble_error_t reset();
ble_error_t preserveBondingStateOnReset(bool enable);
ble_error_t writeBondingStateToPersistentStorage();
////////////////////////////////////////////////////////////////////////////
// List management
//
ble_error_t purgeAllBondingState();
ble_error_t generateWhitelistFromBondTable(::ble::whitelist_t *whitelist) const;
////////////////////////////////////////////////////////////////////////////
// Pairing
//
#if BLE_ROLE_CENTRAL
ble_error_t requestPairing(ble::connection_handle_t connectionHandle);
#endif // BLE_ROLE_CENTRAL
#if BLE_ROLE_PERIPHERAL
ble_error_t acceptPairingRequest(ble::connection_handle_t connectionHandle);
#endif // BLE_ROLE_PERIPHERAL
ble_error_t cancelPairingRequest(ble::connection_handle_t connectionHandle);
ble_error_t setPairingRequestAuthorisation(bool required = true);
ble_error_t getPeerIdentity(ble::connection_handle_t connectionHandle);
////////////////////////////////////////////////////////////////////////////
// Feature support
//
#if BLE_FEATURE_SECURE_CONNECTIONS
ble_error_t allowLegacyPairing(bool allow = true);
ble_error_t getSecureConnectionsSupport(bool *enabled);
#endif // BLE_FEATURE_SECURE_CONNECTIONS
////////////////////////////////////////////////////////////////////////////
// Security settings
//
ble_error_t setIoCapability(SecurityIOCapabilities_t iocaps);
ble_error_t setDisplayPasskey(const Passkey_t passkey);
ble_error_t setLinkSecurity(ble::connection_handle_t connectionHandle, SecurityMode_t securityMode);
ble_error_t setKeypressNotification(bool enabled = true);
#if BLE_FEATURE_SIGNING
ble_error_t enableSigning(ble::connection_handle_t connectionHandle, bool enabled = true);
#endif // BLE_FEATURE_SIGNING
ble_error_t setHintFutureRoleReversal(bool enable = true);
////////////////////////////////////////////////////////////////////////////
// Encryption
//
ble_error_t getLinkEncryption(ble::connection_handle_t connectionHandle, ble::link_encryption_t *encryption);
ble_error_t setLinkEncryption(ble::connection_handle_t connectionHandle, ble::link_encryption_t encryption);
ble_error_t setEncryptionKeyRequirements(uint8_t minimumByteSize, uint8_t maximumByteSize);
ble_error_t getEncryptionKeySize(
connection_handle_t connectionHandle,
uint8_t *size
);
////////////////////////////////////////////////////////////////////////////
// Authentication
//
ble_error_t requestAuthentication(ble::connection_handle_t connectionHandle);
////////////////////////////////////////////////////////////////////////////
// MITM
//
ble_error_t generateOOB(const ble::address_t *address);
ble_error_t setOOBDataUsage(ble::connection_handle_t connectionHandle, bool useOOB, bool OOBProvidesMITM = true);
ble_error_t passkeyEntered(ble::connection_handle_t connectionHandle, Passkey_t passkey);
ble_error_t legacyPairingOobReceived(const ble::address_t *address, const ble::oob_tk_t *tk);
#if BLE_FEATURE_SECURE_CONNECTIONS
ble_error_t confirmationEntered(ble::connection_handle_t connectionHandle, bool confirmation);
ble_error_t sendKeypressNotification(ble::connection_handle_t connectionHandle, ble::Keypress_t keypress);
ble_error_t oobReceived(
const ble::address_t *address,
const ble::oob_lesc_value_t *random,
const ble::oob_confirm_t *confirm
);
#endif // BLE_FEATURE_SECURE_CONNECTIONS
////////////////////////////////////////////////////////////////////////////
// Keys
//
#if BLE_FEATURE_SIGNING
ble_error_t getSigningKey(ble::connection_handle_t connectionHandle, bool authenticated);
#endif // BLE_FEATURE_SIGNING
////////////////////////////////////////////////////////////////////////////
// Privacy
//
#if BLE_FEATURE_PRIVACY
ble_error_t setPrivateAddressTimeout(
uint16_t timeout_in_seconds
);
#endif // BLE_FEATURE_PRIVACY
/* Event callback handlers. */
public:
void onShutdown(const SecurityManagerShutdownCallback_t &callback);
template<typename T>
void onShutdown(T *objPtr, void (T::*memberPtr)(const SecurityManager *));
SecurityManagerShutdownCallbackChain_t &onShutdown();
void setSecurityManagerEventHandler(EventHandler *handler);
/* ===================================================================== */
/* private implementation follows */
private:
/**
* Set the time after which an event will be generated unless we received a packet with
* a valid MIC.
*
* @param[in] connectionHandle Handle to identify the connection.
* @param[in] timeout_in_ms Timeout to set.
*
* @return BLE_ERROR_NONE or appropriate error code indicating the failure reason.
*/
ble_error_t setAuthenticationTimeout(
connection_handle_t connection,
uint32_t timeout_in_ms
);
/**
* Get the time after which an event will be generated unless we received a packet with
* a valid MIC.
*
* @param[in] connectionHandle Handle to identify the connection.
* @param[in] timeout_in_ms Returns the timeout.
*
* @return BLE_ERROR_NONE or appropriate error code indicating the failure reason.
*/
ble_error_t getAuthenticationTimeout(
connection_handle_t connection,
uint32_t *timeout_in_ms
);
/* implements PalSecurityManager::EventHandler */
private:
////////////////////////////////////////////////////////////////////////////
// Pairing
//
#if BLE_ROLE_PERIPHERAL
/** @copydoc PalSecurityManager::on_pairing_request
*/
void on_pairing_request(
connection_handle_t connection,
bool use_oob,
AuthenticationMask authentication,
KeyDistribution initiator_dist,
KeyDistribution responder_dist
) override;
#endif
/** @copydoc PalSecurityManager::on_pairing_error
*/
void on_pairing_error(
connection_handle_t connection,
pairing_failure_t error
) override;
/** @copydoc PalSecurityManager::on_pairing_timed_out
*/
void on_pairing_timed_out(
connection_handle_t connection
) override;
/** @copydoc PalSecurityManager::on_pairing_completed
*/
void on_pairing_completed(
connection_handle_t connection
) override;
////////////////////////////////////////////////////////////////////////////
// Security
//
/** @copydoc PalSecurityManager::on_valid_mic_timeout
*/
void on_valid_mic_timeout(
connection_handle_t connection
) override;
#if BLE_FEATURE_SIGNING
/** @copydoc PalSecurityManager::on_signed_write_received
*/
void on_signed_write_received(
connection_handle_t connection,
uint32_t sign_coutner
) override;
/** @copydoc PalSecurityManager::on_signed_write_verification_failure
*/
void on_signed_write_verification_failure(
connection_handle_t connection
) override;
/** @copydoc PalSecurityManager::on_signed_write
*/
void on_signed_write() override;
#endif // BLE_FEATURE_SIGNING
#if BLE_ROLE_CENTRAL
/** @copydoc PalSecurityManager::on_slave_security_request
*/
void on_slave_security_request(
connection_handle_t connection,
AuthenticationMask authentication
) override;
#endif // BLE_ROLE_CENTRAL
////////////////////////////////////////////////////////////////////////////
// Encryption
//
/** @copydoc PalSecurityManager::on_link_encryption_result
*/
void on_link_encryption_result(
connection_handle_t connection,
link_encryption_t result
) override;
/** @copydoc PalSecurityManager::on_link_encryption_request_timed_out
*/
void on_link_encryption_request_timed_out(
connection_handle_t connection
) override;
////////////////////////////////////////////////////////////////////////////
// MITM
//
/** @copydoc PalSecurityManager::on_passkey_display
*/
void on_passkey_display(
connection_handle_t connection,
passkey_num_t passkey
) override;
#if BLE_FEATURE_SECURE_CONNECTIONS
/** @copydoc PalSecurityManager::on_keypress_notification
*/
void on_keypress_notification(
connection_handle_t connection,
ble::Keypress_t keypress
) override;
#endif // BLE_FEATURE_SECURE_CONNECTIONS
/** @copydoc PalSecurityManager::on_passkey_request
*/
void on_passkey_request(
connection_handle_t connection
) override;
#if BLE_FEATURE_SECURE_CONNECTIONS
/** @copydoc PalSecurityManager::on_confirmation_request
*/
void on_confirmation_request(
connection_handle_t connection
) override;
/** @copydoc PalSecurityManager::on_secure_connections_oob_request
*/
void on_secure_connections_oob_request(
connection_handle_t connection
) override;
#endif // BLE_FEATURE_SECURE_CONNECTIONS
/** @copydoc PalSecurityManager::on_legacy_pairing_oob_request
*/
void on_legacy_pairing_oob_request(
connection_handle_t connection
) override;
#if BLE_FEATURE_SECURE_CONNECTIONS
/** @copydoc PalSecurityManager::on_secure_connections_oob_generated
*/
void on_secure_connections_oob_generated(
const oob_lesc_value_t &random,
const oob_confirm_t &confirm
) override;
#endif
////////////////////////////////////////////////////////////////////////////
// Keys
//
#if BLE_FEATURE_SECURE_CONNECTIONS
/** @copydoc PalSecurityManager::on_secure_connections_ltk_generated
*/
void on_secure_connections_ltk_generated(
connection_handle_t connection,
const ltk_t &ltk
) override;
#endif // BLE_FEATURE_SECURE_CONNECTIONS
/** @copydoc PalSecurityManager::on_keys_distributed_ltk
*/
void on_keys_distributed_ltk(
connection_handle_t connection,
const ltk_t &ltk
) override;
/** @copydoc PalSecurityManager::on_keys_distributed_ediv_rand
*/
void on_keys_distributed_ediv_rand(
connection_handle_t connection,
const ediv_t &ediv,
const rand_t &rand
) override;
/** @copydoc PalSecurityManager::on_keys_distributed_local_ltk
*/
void on_keys_distributed_local_ltk(
connection_handle_t connection,
const ltk_t &ltk
) override;
/** @copydoc PalSecurityManager::on_keys_distributed_local_ediv_rand
*/
void on_keys_distributed_local_ediv_rand(
connection_handle_t connection,
const ediv_t &ediv,
const rand_t &rand
) override;
/** @copydoc PalSecurityManager::on_keys_distributed_irk
*/
void on_keys_distributed_irk(
connection_handle_t connection,
const irk_t &irk
) override;
/** @copydoc PalSecurityManager::on_keys_distributed_bdaddr
*/
void on_keys_distributed_bdaddr(
connection_handle_t connection,
advertising_peer_address_type_t peer_address_type,
const address_t &peer_identity_address
) override;
#if BLE_FEATURE_SIGNING
/** @copydoc PalSecurityManager::on_keys_distributed_csrk
*/
void on_keys_distributed_csrk(
connection_handle_t connection,
const csrk_t &csrk
) override;
#endif // BLE_FEATURE_SIGNING
/** @copydoc PalSecurityManager::on_ltk_requeston_ltk_request
*/
void on_ltk_request(
connection_handle_t connection,
const ediv_t &ediv,
const rand_t &rand
) override;
/** @copydoc PalSecurityManager::on_ltk_requeston_ltk_request
*/
void on_ltk_request(
connection_handle_t connection
) override;
/* end implements PalSecurityManager::EventHandler */
public:
SecurityManager(
ble::PalSecurityManager &palImpl,
ble::PalConnectionMonitor &connMonitorImpl
#if BLE_FEATURE_SIGNING
, ble::PalSigningMonitor &signingMonitorImpl
#endif //BLE_FEATURE_SIGNING
#if BLE_FEATURE_PRIVACY
, PrivateAddressController &privateAddressController
#endif // BLE_FEATURE_PRIVACY
) : eventHandler(nullptr),
_pal(palImpl),
_connection_monitor(connMonitorImpl),
#if BLE_FEATURE_SIGNING
_signing_monitor(signingMonitorImpl),
#endif //BLE_FEATURE_SIGNING
_db(nullptr),
#if BLE_FEATURE_PRIVACY
_private_address_controller(privateAddressController),
#endif // BLE_FEATURE_PRIVACY
_default_authentication(0),
_default_key_distribution(KeyDistribution::KEY_DISTRIBUTION_ALL),
_pairing_authorisation_required(false),
_legacy_pairing_allowed(true),
_master_sends_keys(false)
{
eventHandler = &defaultEventHandler;
_pal.set_event_handler(this);
/* We create a fake value for oob to allow creation of the next oob which needs
* the last process to finish first before restarting (this is to simplify checking).
* This fake value will not be used as the oob address is currently invalid */
_oob_local_random[0] = 1;
}
~SecurityManager()
{
delete _db;
}
private:
/* Disallow copy and assignment. */
SecurityManager(const SecurityManager &);
SecurityManager &operator=(const SecurityManager &);
////////////////////////////////////////////////////////////////////////////
// Helper functions
//
private:
ble_error_t init_database(const char *db_path = nullptr);
#if BLE_FEATURE_PRIVACY
ble_error_t init_resolving_list();
#endif // BLE_FEATURE_PRIVACY
#if BLE_FEATURE_SIGNING
ble_error_t init_signing();
#endif // BLE_FEATURE_SIGNING
#if BLE_FEATURE_PRIVACY
ble_error_t init_identity();
#endif // BLE_FEATURE_PRIVACY
ble_error_t get_random_data(
uint8_t *buffer,
size_t size
);
#if BLE_ROLE_PERIPHERAL
ble_error_t slave_security_request(
connection_handle_t connection
);
#endif
ble_error_t enable_encryption(
connection_handle_t connection
);
void enable_encryption_cb(
ble::SecurityDb::entry_handle_t entry,
const SecurityEntryKeys_t *entryKeys
);
void set_ltk_cb(
SecurityDb::entry_handle_t entry,
const SecurityEntryKeys_t *entryKeys
);
#if BLE_FEATURE_SIGNING
void return_csrk_cb(
SecurityDb::entry_handle_t connection,
const SecurityEntrySigning_t *signing
);
void set_peer_csrk_cb(
SecurityDb::entry_handle_t connection,
const SecurityEntrySigning_t *signing
);
#endif
void update_oob_presence(
connection_handle_t connection
);
void set_mitm_performed(
connection_handle_t connection,
bool enable = true
);
void on_connected(
connection_handle_t connection,
connection_role_t role,
peer_address_type_t peer_address_type,
address_t peer_address,
own_address_type_t local_address_type,
address_t local_address
) override;
void on_disconnected(
connection_handle_t connection,
disconnection_reason_t reason
) override;
void on_security_entry_retrieved(
SecurityDb::entry_handle_t entry,
const SecurityEntryIdentity_t *identity
);
void on_identity_list_retrieved(
Span<SecurityEntryIdentity_t> &identity_list,
size_t count
);
private:
struct ControlBlock_t {
ControlBlock_t();
KeyDistribution get_initiator_key_distribution()
{
return KeyDistribution(initiator_key_distribution);
};
KeyDistribution get_responder_key_distribution()
{
return KeyDistribution(responder_key_distribution);
};
void set_initiator_key_distribution(KeyDistribution mask)
{
initiator_key_distribution = mask.value();
};
void set_responder_key_distribution(KeyDistribution mask)
{
responder_key_distribution = mask.value();
};
connection_handle_t connection;
SecurityDb::entry_handle_t db_entry;
address_t local_address; /**< address used for connection, possibly different from identity */
private:
uint8_t initiator_key_distribution: 4;
uint8_t responder_key_distribution: 4;
public:
uint8_t connected: 1;
uint8_t authenticated: 1; /**< have we turned encryption on during this connection */
uint8_t is_master: 1;
uint8_t encryption_requested: 1;
uint8_t encryption_failed: 1;
uint8_t encrypted: 1;
uint8_t signing_requested: 1;
uint8_t signing_override_default: 1;
uint8_t mitm_requested: 1;
uint8_t mitm_performed: 1; /**< keys exchange will have MITM protection */
uint8_t attempt_oob: 1;
uint8_t oob_mitm_protection: 1;
uint8_t oob_present: 1;
uint8_t legacy_pairing_oob_request_pending: 1;
uint8_t csrk_failures: 2;
};
/* list management */
ControlBlock_t *acquire_control_block(connection_handle_t connection);
ControlBlock_t *get_control_block(connection_handle_t connection);
ControlBlock_t *get_control_block(const address_t &peer_address);
ControlBlock_t *get_control_block(SecurityDb::entry_handle_t db_entry);
void release_control_block(ControlBlock_t *entry);
private:
SecurityManagerShutdownCallbackChain_t shutdownCallChain;
EventHandler *eventHandler;
EventHandler defaultEventHandler;
PalSecurityManager &_pal;
PalConnectionMonitor &_connection_monitor;
#if BLE_FEATURE_SIGNING
PalSigningMonitor &_signing_monitor;
#endif //BLE_FEATURE_SIGNING
SecurityDb *_db;
#if BLE_FEATURE_PRIVACY
PrivateAddressController &_private_address_controller;
#endif // BLE_FEATURE_PRIVACY
/* OOB data */
address_t _oob_local_address;
address_t _oob_peer_address;
oob_lesc_value_t _oob_peer_random;
oob_confirm_t _oob_peer_confirm;
oob_lesc_value_t _oob_local_random;
address_t _oob_temporary_key_creator_address; /**< device which generated and sent the TK */
oob_tk_t _oob_temporary_key; /**< used for legacy pairing */
AuthenticationMask _default_authentication;
KeyDistribution _default_key_distribution;
bool _pairing_authorisation_required;
bool _legacy_pairing_allowed;
bool _master_sends_keys;
static const size_t MAX_CONTROL_BLOCKS = 5;
ControlBlock_t _control_blocks[MAX_CONTROL_BLOCKS];
};
} // namespace impl
} // ble
#endif /*IMPL_SECURITY_MANAGER_H_*/
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