mirror of https://github.com/ARMmbed/mbed-os.git
332 lines
14 KiB
C++
332 lines
14 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2015 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __SECURITY_MANAGER_H__
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#define __SECURITY_MANAGER_H__
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#include <stdint.h>
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#include "Gap.h"
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#include "CallChainOfFunctionPointersWithContext.h"
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class SecurityManager {
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public:
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enum SecurityMode_t {
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SECURITY_MODE_NO_ACCESS,
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SECURITY_MODE_ENCRYPTION_OPEN_LINK, /**< Require no protection, open link. */
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SECURITY_MODE_ENCRYPTION_NO_MITM, /**< Require encryption, but no MITM protection. */
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SECURITY_MODE_ENCRYPTION_WITH_MITM, /**< Require encryption and MITM protection. */
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SECURITY_MODE_SIGNED_NO_MITM, /**< Require signing or encryption, but no MITM protection. */
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SECURITY_MODE_SIGNED_WITH_MITM, /**< Require signing or encryption, and MITM protection. */
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};
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/**
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* @brief Defines possible security status or states.
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*
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* @details Defines possible security status or states of a link when requested by getLinkSecurity().
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*/
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enum LinkSecurityStatus_t {
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NOT_ENCRYPTED, /**< The link is not secured. */
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ENCRYPTION_IN_PROGRESS, /**< Link security is being established.*/
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ENCRYPTED /**< The link is secure.*/
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};
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enum SecurityIOCapabilities_t {
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IO_CAPS_DISPLAY_ONLY = 0x00, /**< Display only. */
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IO_CAPS_DISPLAY_YESNO = 0x01, /**< Display and yes/no entry. */
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IO_CAPS_KEYBOARD_ONLY = 0x02, /**< Keyboard only. */
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IO_CAPS_NONE = 0x03, /**< No I/O capabilities. */
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IO_CAPS_KEYBOARD_DISPLAY = 0x04, /**< Keyboard and display. */
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};
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enum SecurityCompletionStatus_t {
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SEC_STATUS_SUCCESS = 0x00, /**< Procedure completed with success. */
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SEC_STATUS_TIMEOUT = 0x01, /**< Procedure timed out. */
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SEC_STATUS_PDU_INVALID = 0x02, /**< Invalid PDU received. */
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SEC_STATUS_PASSKEY_ENTRY_FAILED = 0x81, /**< Passkey entry failed (user canceled or other). */
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SEC_STATUS_OOB_NOT_AVAILABLE = 0x82, /**< Out of Band Key not available. */
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SEC_STATUS_AUTH_REQ = 0x83, /**< Authentication requirements not met. */
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SEC_STATUS_CONFIRM_VALUE = 0x84, /**< Confirm value failed. */
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SEC_STATUS_PAIRING_NOT_SUPP = 0x85, /**< Pairing not supported. */
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SEC_STATUS_ENC_KEY_SIZE = 0x86, /**< Encryption key size. */
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SEC_STATUS_SMP_CMD_UNSUPPORTED = 0x87, /**< Unsupported SMP command. */
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SEC_STATUS_UNSPECIFIED = 0x88, /**< Unspecified reason. */
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SEC_STATUS_REPEATED_ATTEMPTS = 0x89, /**< Too little time elapsed since last attempt. */
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SEC_STATUS_INVALID_PARAMS = 0x8A, /**< Invalid parameters. */
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};
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/**
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* Declaration of type containing a passkey to be used during pairing. This
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* is passed into initializeSecurity() to specify a pre-programmed passkey
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* for authentication instead of generating a random one.
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*/
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static const unsigned PASSKEY_LEN = 6;
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typedef uint8_t Passkey_t[PASSKEY_LEN]; /**< 6-digit passkey in ASCII ('0'-'9' digits only). */
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public:
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typedef void (*HandleSpecificEvent_t)(Gap::Handle_t handle);
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typedef void (*SecuritySetupInitiatedCallback_t)(Gap::Handle_t, bool allowBonding, bool requireMITM, SecurityIOCapabilities_t iocaps);
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typedef void (*SecuritySetupCompletedCallback_t)(Gap::Handle_t, SecurityCompletionStatus_t status);
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typedef void (*LinkSecuredCallback_t)(Gap::Handle_t handle, SecurityMode_t securityMode);
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typedef void (*PasskeyDisplayCallback_t)(Gap::Handle_t handle, const Passkey_t passkey);
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typedef FunctionPointerWithContext<const SecurityManager *> SecurityManagerShutdownCallback_t;
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typedef CallChainOfFunctionPointersWithContext<const SecurityManager *> SecurityManagerShutdownCallbackChain_t;
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/*
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* The following functions are meant to be overridden in the platform-specific sub-class.
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*/
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public:
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/**
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* Enable the BLE stack's Security Manager. The Security Manager implements
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* the actual cryptographic algorithms and protocol exchanges that allow two
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* devices to securely exchange data and privately detect each other.
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* Calling this API is a prerequisite for encryption and pairing (bonding).
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*
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* @param[in] enableBonding Allow for bonding.
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* @param[in] requireMITM Require protection for man-in-the-middle attacks.
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* @param[in] iocaps To specify the I/O capabilities of this peripheral,
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* such as availability of a display or keyboard, to
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* support out-of-band exchanges of security data.
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* @param[in] passkey To specify a static passkey.
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*
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* @return BLE_ERROR_NONE on success.
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*/
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virtual ble_error_t init(bool enableBonding = true,
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bool requireMITM = true,
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SecurityIOCapabilities_t iocaps = IO_CAPS_NONE,
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const Passkey_t passkey = NULL) {
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/* Avoid compiler warnings about unused variables. */
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(void)enableBonding;
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(void)requireMITM;
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(void)iocaps;
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(void)passkey;
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return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if security is supported. */
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}
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/**
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* Get the security status of a connection.
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*
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* @param[in] connectionHandle Handle to identify the connection.
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* @param[out] securityStatusP Security status.
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*
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* @return BLE_ERROR_NONE or appropriate error code indicating the failure reason.
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*/
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virtual ble_error_t getLinkSecurity(Gap::Handle_t connectionHandle, LinkSecurityStatus_t *securityStatusP) {
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/* Avoid compiler warnings about unused variables. */
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(void)connectionHandle;
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(void)securityStatusP;
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return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if security is supported. */
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}
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/**
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* Set the security mode on a connection. Useful for elevating the security mode
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* once certain conditions are met, e.g., a particular service is found.
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*
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* @param[in] connectionHandle Handle to identify the connection.
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* @param[in] securityMode Requested security mode.
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*
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* @return BLE_ERROR_NONE or appropriate error code indicating the failure reason.
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*/
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virtual ble_error_t setLinkSecurity(Gap::Handle_t connectionHandle, SecurityMode_t securityMode) {
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/* Avoid compiler warnings about unused variables. */
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(void)connectionHandle;
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(void)securityMode;
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return BLE_ERROR_NOT_IMPLEMENTED;
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}
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/**
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* Delete all peer device context and all related bonding information from
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* the database within the security manager.
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*
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* @retval BLE_ERROR_NONE On success, else an error code indicating reason for failure.
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* @retval BLE_ERROR_INVALID_STATE If the API is called without module initialization or
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* application registration.
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*/
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virtual ble_error_t purgeAllBondingState(void) {
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return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if security is supported. */
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}
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/**
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* Get a list of addresses from all peers in the bond table.
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*
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* @param[in,out] addresses
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* (on input) addresses.capacity contains the maximum
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* number of addresses to be returned.
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* (on output) The populated table with copies of the
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* addresses in the implementation's whitelist.
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*
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* @retval BLE_ERROR_NONE On success, else an error code indicating reason for failure.
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* @retval BLE_ERROR_INVALID_STATE If the API is called without module initialization or
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* application registration.
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*
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* @experimental
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*/
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virtual ble_error_t getAddressesFromBondTable(Gap::Whitelist_t &addresses) const {
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/* Avoid compiler warnings about unused variables */
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(void) addresses;
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return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if security is supported. */
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}
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/* Event callback handlers. */
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public:
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/**
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* Setup a callback to be invoked to notify the user application that the
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* SecurityManager instance is about to shutdown (possibly as a result of a call
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* to BLE::shutdown()).
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*
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* @note It is possible to chain together multiple onShutdown callbacks
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* (potentially from different modules of an application) to be notified
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* before the SecurityManager is shutdown.
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*
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* @note It is also possible to set up a callback into a member function of
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* some object.
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*
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* @note It is possible to unregister a callback using onShutdown().detach(callback)
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*/
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void onShutdown(const SecurityManagerShutdownCallback_t& callback) {
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shutdownCallChain.add(callback);
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}
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template <typename T>
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void onShutdown(T *objPtr, void (T::*memberPtr)(const SecurityManager *)) {
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shutdownCallChain.add(objPtr, memberPtr);
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}
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/**
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* @brief provide access to the callchain of shutdown event callbacks
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* It is possible to register callbacks using onShutdown().add(callback);
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* It is possible to unregister callbacks using onShutdown().detach(callback)
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* @return The shutdown event callbacks chain
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*/
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SecurityManagerShutdownCallbackChain_t& onShutdown() {
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return shutdownCallChain;
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}
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/**
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* To indicate that a security procedure for the link has started.
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*/
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virtual void onSecuritySetupInitiated(SecuritySetupInitiatedCallback_t callback) {securitySetupInitiatedCallback = callback;}
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/**
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* To indicate that the security procedure for the link has completed.
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*/
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virtual void onSecuritySetupCompleted(SecuritySetupCompletedCallback_t callback) {securitySetupCompletedCallback = callback;}
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/**
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* To indicate that the link with the peer is secured. For bonded devices,
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* subsequent reconnections with a bonded peer will result only in this callback
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* when the link is secured; setup procedures will not occur (unless the
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* bonding information is either lost or deleted on either or both sides).
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*/
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virtual void onLinkSecured(LinkSecuredCallback_t callback) {linkSecuredCallback = callback;}
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/**
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* To indicate that device context is stored persistently.
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*/
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virtual void onSecurityContextStored(HandleSpecificEvent_t callback) {securityContextStoredCallback = callback;}
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/**
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* To set the callback for when the passkey needs to be displayed on a peripheral with DISPLAY capability.
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*/
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virtual void onPasskeyDisplay(PasskeyDisplayCallback_t callback) {passkeyDisplayCallback = callback;}
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/* Entry points for the underlying stack to report events back to the user. */
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public:
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void processSecuritySetupInitiatedEvent(Gap::Handle_t handle, bool allowBonding, bool requireMITM, SecurityIOCapabilities_t iocaps) {
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if (securitySetupInitiatedCallback) {
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securitySetupInitiatedCallback(handle, allowBonding, requireMITM, iocaps);
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}
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}
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void processSecuritySetupCompletedEvent(Gap::Handle_t handle, SecurityCompletionStatus_t status) {
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if (securitySetupCompletedCallback) {
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securitySetupCompletedCallback(handle, status);
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}
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}
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void processLinkSecuredEvent(Gap::Handle_t handle, SecurityMode_t securityMode) {
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if (linkSecuredCallback) {
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linkSecuredCallback(handle, securityMode);
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}
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}
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void processSecurityContextStoredEvent(Gap::Handle_t handle) {
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if (securityContextStoredCallback) {
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securityContextStoredCallback(handle);
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}
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}
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void processPasskeyDisplayEvent(Gap::Handle_t handle, const Passkey_t passkey) {
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if (passkeyDisplayCallback) {
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passkeyDisplayCallback(handle, passkey);
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}
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}
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protected:
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SecurityManager() :
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securitySetupInitiatedCallback(),
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securitySetupCompletedCallback(),
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linkSecuredCallback(),
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securityContextStoredCallback(),
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passkeyDisplayCallback() {
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/* empty */
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}
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public:
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/**
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* Notify all registered onShutdown callbacks that the SecurityManager is
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* about to be shutdown and clear all SecurityManager state of the
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* associated object.
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*
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* This function is meant to be overridden in the platform-specific
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* sub-class. Nevertheless, the sub-class is only expected to reset its
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* state and not the data held in SecurityManager members. This shall be
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* achieved by a call to SecurityManager::reset() from the sub-class'
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* reset() implementation.
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*
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* @return BLE_ERROR_NONE on success.
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*/
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virtual ble_error_t reset(void) {
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/* Notify that the instance is about to shutdown */
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shutdownCallChain.call(this);
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shutdownCallChain.clear();
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securitySetupInitiatedCallback = NULL;
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securitySetupCompletedCallback = NULL;
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linkSecuredCallback = NULL;
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securityContextStoredCallback = NULL;
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passkeyDisplayCallback = NULL;
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return BLE_ERROR_NONE;
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}
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protected:
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SecuritySetupInitiatedCallback_t securitySetupInitiatedCallback;
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SecuritySetupCompletedCallback_t securitySetupCompletedCallback;
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LinkSecuredCallback_t linkSecuredCallback;
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HandleSpecificEvent_t securityContextStoredCallback;
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PasskeyDisplayCallback_t passkeyDisplayCallback;
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private:
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SecurityManagerShutdownCallbackChain_t shutdownCallChain;
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};
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#endif /*__SECURITY_MANAGER_H__*/
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