Switch to ethernet, challenge-response
This commit is contained in:
Christoph Hagen
parent
69a8f32179
commit
9b49c3565d
@ -3,25 +3,37 @@
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#include "server.h"
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#include "servo.h"
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#include "message.h"
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#include "storage.h"
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#include "fresh.h"
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#include <ESPAsyncWebServer.h>
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struct WifiConfiguration {
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struct EthernetConfiguration {
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// The WiFi network to connect to
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const char* ssid;
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// The MAC address of the ethernet connection
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uint8_t macAddress[6];
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// The WiFi password to connect to the above network
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const char* password;
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// The master-in slave-out pin of the SPI connection for the Ethernet module
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int8_t spiPinMiso;
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// The name of the device on the network
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const char* networkName;
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// The master-out slave-in pin of the SPI connection for the Ethernet module
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int8_t spiPinMosi;
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// The interval to reconnect to WiFi if the connection is broken
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uint32_t reconnectInterval;
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// The slave clock pin of the SPI connection for the Ethernet module
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int8_t spiPinSclk;
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uint32_t periodicReconnectInterval;
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// The slave-select pin of the SPI connection for the Ethernet module
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int8_t spiPinSS;
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unsigned long dhcpLeaseTimeoutMs;
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unsigned long dhcpLeaseResponseTimeoutMs;
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// The static IP address to assign if DHCP fails
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uint8_t manualIp[4];
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// The IP address of the DNS server, if DHCP fails
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uint8_t manualDnsAddress[4];
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uint32_t socketHeartbeatIntervalMs;
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uint32_t socketHeartbeatTimeoutMs;
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uint8_t socketHeartbeatFailureReconnectCount;
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};
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struct KeyConfiguration {
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@ -29,55 +41,87 @@ struct KeyConfiguration {
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const uint8_t* remoteKey;
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const uint8_t* localKey;
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uint32_t challengeExpiryMs;
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};
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class SesameController: public ServerConnectionCallbacks {
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public:
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SesameController(uint16_t localWebServerPort, uint8_t remoteDeviceCount);
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SesameController(uint16_t localWebServerPort);
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void configure(ServoConfiguration servoConfig, ServerConfiguration serverConfig, TimeConfiguration timeConfig, WifiConfiguration wifiConfig, KeyConfiguration keyConfig);
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void configure(ServoConfiguration servoConfig, ServerConfiguration serverConfig, EthernetConfiguration ethernetConfig, KeyConfiguration keyConfig);
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void loop(uint32_t millis);
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private:
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uint32_t currentTime = 0;
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ServerConnection server;
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ServoController servo;
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AsyncWebServer localWebServer;
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TimeCheck timeCheck;
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Storage storage;
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WifiConfiguration wifiConfig;
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EthernetConfiguration ethernetConfig;
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bool ethernetIsConfigured = false;
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KeyConfiguration keyConfig;
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bool isReconnecting = false;
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// The buffer to hold a received message while it is read
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uint8_t receivedMessageBuffer[AUTHENTICATED_MESSAGE_SIZE];
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// Buffer to get local message
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SignedMessage receivedLocalMessage;
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// The buffer to hold a response while it is sent
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uint8_t responseBuffer[AUTHENTICATED_MESSAGE_SIZE+1];
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SesameEvent* responseStatus;
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AuthenticatedMessage* responseMessage;
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uint16_t responseSize = 0;
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uint32_t currentClientChallenge;
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uint32_t currentChallengeExpiry = 0;
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uint32_t currentServerChallenge;
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SignedMessage outgoingMessage;
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bool hasCurrentChallenge() {
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return currentChallengeExpiry > currentTime;
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}
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void clearCurrentChallenge() {
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currentClientChallenge = 0;
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currentServerChallenge = 0;
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currentChallengeExpiry = 0;
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}
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/**
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* @brief Send an error Response over the web socket.
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*
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* @param result The error result to send
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* @param discardMessage Indicate if the stored message should be cleared.
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*
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* Note: Only clear the message if no other operation is in progress.
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*/
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void sendErrorResponseToServer(MessageResult result, bool discardMessage = true);
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void ensureWiFiConnection(uint32_t time);
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void ensureWebSocketConnection();
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void handleLocalMessage(AsyncWebServerRequest *request);
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// Based on https://stackoverflow.com/a/23898449/266720
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bool convertHexMessageToBinary(const char* str);
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void handleServerMessage(uint8_t* payload, size_t length);
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void sendServerError(SesameEvent event);
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void processMessage(AuthenticatedMessage* message);
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SesameEvent verifyAndProcessReceivedMessage(AuthenticatedMessage* message);
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/**
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* @brief Callback to send an error back to the server via the web socket.
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*
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* This function is called when the socket get's an error.
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*
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* @param event The error to report back
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*/
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void sendServerError(MessageResult event);
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void prepareResponseBuffer(SesameEvent event, uint8_t deviceId = 0);
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void processMessage(SignedMessage* message);
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MessageResult verifyAndProcessReceivedMessage(SignedMessage* message);
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void prepareResponseBuffer(MessageResult event, Message* message = NULL);
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void sendPreparedLocalResponse(AsyncWebServerRequest *request);
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void sendPreparedServerResponse();
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void sendPreparedResponseToServer();
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void periodicallyReconnectWifiAndSocket(uint32_t millis);
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void prepareChallenge(Message* message);
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void completeUnlockRequest(Message* message);
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};
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@ -3,6 +3,15 @@
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#include "message.h"
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#include <stddef.h>
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void enableCrypto();
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/**
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* @brief Create a random server challenge.
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*
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* @return uint32_t
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*/
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uint32_t randomChallenge();
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/**
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* @brief Create a message authentication code (MAC) for some data.
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*
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@ -10,11 +19,10 @@
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* @param dataLength The number of bytes to authenticate
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* @param mac The output to store the MAC (must be at least 32 bytes)
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* @param key The secret key used for authentication
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* @param keyLength The length of the secret key
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* @return true The MAC was successfully written
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* @return false The MAC could not be created
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*/
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bool authenticateData(const uint8_t* data, size_t dataLength, uint8_t* mac, const uint8_t* key, size_t keyLength);
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bool authenticateData(const uint8_t* data, size_t dataLength, uint8_t* mac, const uint8_t* key);
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/**
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* @brief Calculate a MAC for message content.
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@ -22,22 +30,20 @@ bool authenticateData(const uint8_t* data, size_t dataLength, uint8_t* mac, cons
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* @param message The message for which to calculate the MAC.
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* @param mac The output where the computed MAC is stored
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* @param key The secret key used for authentication
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* @param keyLength The length of the secret key
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* @return true The MAC was successfully computed
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* @return false The MAC could not be created
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*/
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bool authenticateMessage(Message* message, uint8_t* mac, const uint8_t* key, size_t keyLength);
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bool authenticateMessage(Message* message, uint8_t* mac, const uint8_t* key);
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/**
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* @brief Create a message authentication code (MAC) for a message.
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*
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* @param message The message to authenticate
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* @param key The secret key used for authentication
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* @param keyLength The length of the secret key
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* @return true The MAC was successfully added to the message
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* @return false The MAC could not be created
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*/
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bool authenticateMessage(AuthenticatedMessage* message, const uint8_t* key, size_t keyLength);
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bool authenticateMessage(SignedMessage* message, const uint8_t* key);
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/**
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* @brief Check if a received unlock message is authentic
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@ -48,8 +54,7 @@ bool authenticateMessage(AuthenticatedMessage* message, const uint8_t* key, size
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*
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* @param message The message to authenticate
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* @param key The secret key used for authentication
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* @param keyLength The length of the key in bytes
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* @return true The message is authentic
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* @return false The message is invalid, or the MAC could not be calculated
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*/
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bool isAuthenticMessage(AuthenticatedMessage* message, const uint8_t* key, size_t keyLength);
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bool isAuthenticMessage(SignedMessage* message, const uint8_t* key);
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@ -1,80 +0,0 @@
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#pragma once
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#include <stdint.h>
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struct TimeConfiguration {
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/**
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* @brief The timezone offset in seconds
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*/
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int32_t offsetToGMT;
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/**
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* @brief The daylight savings offset in seconds
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*/
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int32_t offsetDaylightSavings;
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/**
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* @brief The url of the NTP server
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*/
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const char* ntpServerUrl;
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/**
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* @brief The allowed discrepancy between the time of a received message
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* and the device time (in seconds)
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*
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* A stricter (lower) value better prevents against replay attacks,
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* but may lead to issues when dealing with slow networks and other
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* routing delays.
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*/
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uint32_t allowedTimeOffset;
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};
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class TimeCheck {
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public:
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/**
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* @brief Create a time checker instance
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*/
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TimeCheck();
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/**
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* @brief Set the configuration
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*/
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void configure(TimeConfiguration configuration);
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/**
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* @brief Configure the NTP server to get the current time
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*/
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void startNTP();
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/**
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* @brief Print the current time to the serial output
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*
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* The time must be initialized by calling `configureNTP()` before use.
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*/
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void printLocalTime();
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/**
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* Gets the current epoch time
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*/
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uint32_t getEpochTime();
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/**
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* @brief Check wether the time of a message is within the allowed bounds regarding freshness.
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*
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* The timestamp is used to ensure 'freshness' of the messages,
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* i.e. that they are not unreasonably delayed or captured and
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* later replayed by an attacker.
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*
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* @param messageTime The timestamp of the message (seconds since epoch)
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* @return true The time is within the acceptable offset of the local time
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* @return false The message time is invalid
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*/
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bool isMessageTimeAcceptable(uint32_t messageTime);
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private:
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TimeConfiguration config;
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};
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@ -14,58 +14,93 @@
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#pragma pack(push, 1)
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typedef enum {
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/// @brief The initial message from remote to device to request a challenge.
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initial = 0,
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/// @brief The second message in an unlock with the challenge from the device to the remote
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challenge = 1,
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/// @brief The third message with the signed challenge from the remote to the device
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request = 2,
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/// @brief The final message with the unlock result from the device to the remote
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response = 3,
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} MessageType;
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enum class MessageResult: uint8_t {
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/// @brief The message was accepted.
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MessageAccepted = 0,
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/// @brief The web socket received text while waiting for binary data.
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TextReceived = 1,
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/// @brief An unexpected socket event occured while performing the exchange.
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UnexpectedSocketEvent = 2,
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/// @brief The received message size is invalid.
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InvalidMessageSize = 3,
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/// @brief The message signature was incorrect.
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MessageAuthenticationFailed = 4,
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/// @brief The server challenge of the message did not match previous messages
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ServerChallengeMismatch = 5,
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/// @brief The client challenge of the message did not match previous messages
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ClientChallengeInvalid = 6,
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/// @brief An unexpected or unsupported message type was received
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InvalidMessageType = 7,
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/// @brief A message is already being processed
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TooManyRequests = 8,
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InvalidUrlParameter = 10,
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InvalidResponseAuthentication = 11,
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};
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/**
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* @brief The content of an unlock message.
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*
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* The content is necessary to ensure freshness of the message
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* by requiring a recent time and a monotonously increasing counter.
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* This prevents messages from being delayed or being blocked and
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* replayed later.
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* @brief A generic message to exchange during challenge-response authentication.
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*/
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typedef struct {
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/**
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* The timestamp of message creation
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*
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* The timestamp is encoded as the epoch time, i.e. seconds since 1970 (GMT).
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*
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* The timestamp is used to ensure 'freshness' of the messages,
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* i.e. that they are not unreasonably delayed or captured and
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* later replayed by an attacker.
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*/
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uint32_t time;
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/**
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* The counter of unlock messages
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*
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* This counter must always increase with each message from the remote
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* in order for the messages to be deemed valid. Transfering the counters
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* back and forth also gives information about lost messages and potential
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* attacks. Both the remote and the device keep a record of at least the
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* last used counter.
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*/
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uint32_t id;
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/// @brief The type of message being sent.
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MessageType messageType;
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/**
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* @brief The id of the device sending the message
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* @brief The random nonce created by the remote
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*
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* This nonce is a random number created by the remote, different for each unlock request.
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* It is set for all message types.
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*/
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uint8_t device;
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uint32_t clientChallenge;
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/**
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* @brief A random number to sign by the remote
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*
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* This nonce is set by the server after receiving an initial message.
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* It is set for the message types `challenge`, `request`, and `response`.
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*/
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uint32_t serverChallenge;
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/**
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* @brief The response status for the previous message.
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*
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* It is set only for messages from the server, e.g. the `challenge` and `response` message types.
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* Must be set to `MessageAccepted` for other messages.
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*/
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MessageResult result;
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} Message;
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constexpr size_t messageCounterSize = sizeof(uint32_t);
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/**
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* @brief An authenticated message by the mobile device to command unlocking.
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* @brief The signed version of a message.
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*
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* The message is protected by a message authentication code (MAC) based on
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* a symmetric key shared by the device and the remote. This code ensures
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* that the contents of the request were not altered. The message further
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* contains a timestamp to ensure that the message is recent, and not replayed
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* by an attacker. An additional counter is also included for this purpose,
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* which must continously increase for a message to be valid. This increases
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* security a bit, since the timestamp validation must be tolerant to some
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* inaccuracy due to mismatching clocks.
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*/
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typedef struct {
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@ -77,38 +112,18 @@ typedef struct {
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*/
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uint8_t mac[SHA256_MAC_SIZE];
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/**
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* @brief The message content.
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*
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* The content is necessary to ensure freshness of the message
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* by requiring a recent time and a monotonously increasing counter.
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* This prevents messages from being delayed or being blocked and
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* replayed later.
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*/
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/// @brief The message
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Message message;
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} AuthenticatedMessage;
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} SignedMessage;
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constexpr size_t messageCounterSize = sizeof(uint32_t);
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#pragma pack(pop)
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constexpr int MESSAGE_CONTENT_SIZE = sizeof(Message);
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constexpr int AUTHENTICATED_MESSAGE_SIZE = sizeof(AuthenticatedMessage);
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/**
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* An event signaled from the device
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*/
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enum class SesameEvent {
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TextReceived = 1,
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UnexpectedSocketEvent = 2,
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InvalidMessageSize = 3,
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MessageAuthenticationFailed = 4,
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MessageTimeMismatch = 5,
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MessageCounterInvalid = 6,
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MessageAccepted = 7,
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MessageDeviceInvalid = 8,
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InvalidUrlParameter = 20,
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InvalidResponseAuthentication = 21,
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};
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constexpr int SIGNED_MESSAGE_SIZE = sizeof(SignedMessage);
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/**
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* @brief A callback for messages received over the socket
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@ -121,5 +136,5 @@ typedef void (*MessageCallback)(uint8_t* payload, size_t length);
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/**
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* @brief A callback for socket errors
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*/
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typedef void (*ErrorCallback)(SesameEvent event);
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typedef void (*ErrorCallback)(MessageResult event);
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@ -2,8 +2,6 @@
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#include "message.h"
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#include "crypto.h"
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#include <WiFiMulti.h>
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#include <WiFiClientSecure.h>
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#include <WebSocketsClient.h>
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struct ServerConfiguration {
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@ -36,7 +34,7 @@ class ServerConnectionCallbacks {
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public:
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virtual void sendServerError(SesameEvent event) = 0;
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virtual void sendServerError(MessageResult event) = 0;
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virtual void handleServerMessage(uint8_t* payload, size_t length) = 0;
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};
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@ -1,83 +0,0 @@
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#pragma once
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#include <stdint.h>
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class Storage {
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public:
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Storage(uint8_t remoteDeviceCount) : remoteDeviceCount(remoteDeviceCount) { };
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/**
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* @brief Initialize the use of the message counter API
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*
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* The message counter is stored in EEPROM, which must be initialized before use.
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*
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* @note The ESP32 does not have a true EEPROM,
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* which is emulated using a section of the flash memory.
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*/
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void configure();
|
||||
|
||||
/**
|
||||
* @brief Check if a device ID is allowed
|
||||
*
|
||||
* @param deviceId The ID to check
|
||||
* @return true The id is valid
|
||||
* @return false The id is invalid
|
||||
*/
|
||||
bool isDeviceIdValid(uint8_t deviceId);
|
||||
|
||||
/**
|
||||
* @brief Check if a received counter is valid
|
||||
*
|
||||
* The counter is valid if it is larger than the previous counter
|
||||
* (larger or equal to the next expected counter).
|
||||
*
|
||||
* @param counter The counter to check
|
||||
* @return true The counter is valid
|
||||
* @return false The counter belongs to an old message
|
||||
*/
|
||||
bool isMessageCounterValid(uint32_t counter, uint8_t deviceId);
|
||||
|
||||
/**
|
||||
* @brief Mark a counter of a message as used.
|
||||
*
|
||||
* The counter value is stored in EEPROM to persist across restarts.
|
||||
*
|
||||
* All messages with counters lower than the given one will become invalid.
|
||||
*
|
||||
* @param counter The counter used in the last message.
|
||||
*/
|
||||
void didUseMessageCounter(uint32_t counter, uint8_t deviceId);
|
||||
|
||||
/**
|
||||
* @brief Get the expected count for the next message.
|
||||
*
|
||||
* The counter is stored in EEPROM to persist across restarts
|
||||
*
|
||||
* @return The next counter to use by the remote
|
||||
*/
|
||||
uint32_t getNextMessageCounter(uint8_t deviceId);
|
||||
|
||||
/**
|
||||
* @brief Print info about the current message counter to the serial output
|
||||
*
|
||||
*/
|
||||
void printMessageCounters();
|
||||
|
||||
/**
|
||||
* @brief Reset the message counter.
|
||||
*
|
||||
* @warning The counter should never be reset in production environments,
|
||||
* and only together with a new secret key. Otherwise old messages may be
|
||||
* used for replay attacks.
|
||||
*
|
||||
*/
|
||||
void resetMessageCounters();
|
||||
|
||||
private:
|
||||
|
||||
uint8_t remoteDeviceCount;
|
||||
|
||||
void setMessageCounter(uint32_t counter, uint8_t deviceId);
|
||||
};
|
||||
@ -13,7 +13,10 @@ platform = espressif32
|
||||
board = az-delivery-devkit-v4
|
||||
framework = arduino
|
||||
lib_deps =
|
||||
links2004/WebSockets@^2.3.7
|
||||
; links2004/WebSockets@^2.4.0
|
||||
madhephaestus/ESP32Servo@^1.1.0
|
||||
ottowinter/ESPAsyncWebServer-esphome@^3.0.0
|
||||
arduino-libraries/Ethernet@^2.0.2
|
||||
https://github.com/christophhagen/arduinoWebSockets#master
|
||||
|
||||
monitor_speed = 115200
|
||||
|
||||
@ -2,23 +2,47 @@
|
||||
#include "crypto.h"
|
||||
#include "config.h"
|
||||
|
||||
#include <WiFi.h>
|
||||
#include <SPI.h>
|
||||
#include <Ethernet.h>
|
||||
|
||||
SesameController::SesameController(uint16_t localWebServerPort) : localWebServer(localWebServerPort) {
|
||||
|
||||
SesameController::SesameController(uint16_t localWebServerPort, uint8_t remoteDeviceCount) :
|
||||
storage(remoteDeviceCount), localWebServer(localWebServerPort) {
|
||||
|
||||
// Set up response buffer
|
||||
responseStatus = (SesameEvent*) responseBuffer;
|
||||
responseMessage = (AuthenticatedMessage*) (responseBuffer + 1);
|
||||
}
|
||||
|
||||
void SesameController::configure(ServoConfiguration servoConfig, ServerConfiguration serverConfig, TimeConfiguration timeConfig, WifiConfiguration wifiConfig, KeyConfiguration keyConfig) {
|
||||
this->wifiConfig = wifiConfig;
|
||||
void SesameController::configure(ServoConfiguration servoConfig, ServerConfiguration serverConfig, EthernetConfiguration ethernetConfig, KeyConfiguration keyConfig) {
|
||||
this->ethernetConfig = ethernetConfig;
|
||||
this->keyConfig = keyConfig;
|
||||
|
||||
// Prepare EEPROM for reading and writing
|
||||
storage.configure();
|
||||
Serial.println("[INFO] Storage configured");
|
||||
// Ensure source of random numbers without WiFi and Bluetooth
|
||||
enableCrypto();
|
||||
|
||||
// Initialize SPI interface to Ethernet module
|
||||
SPI.begin(ethernetConfig.spiPinSclk, ethernetConfig.spiPinMiso, ethernetConfig.spiPinMosi, ethernetConfig.spiPinSS); //SCLK, MISO, MOSI, SS
|
||||
pinMode(ethernetConfig.spiPinSS, OUTPUT);
|
||||
|
||||
Ethernet.init(ethernetConfig.spiPinSS);
|
||||
|
||||
// Check for Ethernet hardware present
|
||||
if (Ethernet.hardwareStatus() == EthernetNoHardware) {
|
||||
Serial.println("[ERROR] Ethernet shield not found.");
|
||||
} else if (Ethernet.linkStatus() == LinkOFF) {
|
||||
Serial.println("[ERROR] Ethernet cable is not connected.");
|
||||
} else if (Ethernet.linkStatus() == Unknown) {
|
||||
Serial.println("[ERROR] Ethernet cable status unknown.");
|
||||
} else if (Ethernet.linkStatus() == LinkON) {
|
||||
Serial.println("[INFO] Ethernet cable is connected.");
|
||||
if (Ethernet.begin(ethernetConfig.macAddress, ethernetConfig.dhcpLeaseTimeoutMs, ethernetConfig.dhcpLeaseResponseTimeoutMs) == 1) {
|
||||
Serial.print("[INFO] DHCP assigned IP ");
|
||||
Serial.println(Ethernet.localIP());
|
||||
ethernetIsConfigured = true;
|
||||
} else {
|
||||
// Try to configure using IP address instead of DHCP
|
||||
Ethernet.begin(ethernetConfig.macAddress, ethernetConfig.manualIp, ethernetConfig.manualDnsAddress);
|
||||
Serial.print("[WARNING] DHCP failed, using self-assigned IP ");
|
||||
Serial.println(Ethernet.localIP());
|
||||
ethernetIsConfigured = true;
|
||||
}
|
||||
}
|
||||
|
||||
servo.configure(servoConfig);
|
||||
Serial.println("[INFO] Servo configured");
|
||||
@ -26,9 +50,6 @@ void SesameController::configure(ServoConfiguration servoConfig, ServerConfigura
|
||||
// Direct messages and errors over the websocket to the controller
|
||||
server.configure(serverConfig, this);
|
||||
Serial.println("[INFO] Server connection configured");
|
||||
|
||||
timeCheck.configure(timeConfig);
|
||||
|
||||
|
||||
// Direct messages from the local web server to the controller
|
||||
localWebServer.on("/message", HTTP_POST, [this] (AsyncWebServerRequest *request) {
|
||||
@ -37,17 +58,13 @@ void SesameController::configure(ServoConfiguration servoConfig, ServerConfigura
|
||||
});
|
||||
|
||||
Serial.println("[INFO] Local web server configured");
|
||||
|
||||
//storage.resetMessageCounters();
|
||||
storage.printMessageCounters();
|
||||
}
|
||||
|
||||
void SesameController::loop(uint32_t millis) {
|
||||
currentTime = millis;
|
||||
server.loop();
|
||||
servo.loop(millis);
|
||||
|
||||
periodicallyReconnectWifiAndSocket(millis);
|
||||
ensureWiFiConnection(millis);
|
||||
ensureWebSocketConnection();
|
||||
}
|
||||
|
||||
@ -56,126 +73,134 @@ void SesameController::loop(uint32_t millis) {
|
||||
void SesameController::handleLocalMessage(AsyncWebServerRequest *request) {
|
||||
if (!request->hasParam(messageUrlParameter)) {
|
||||
Serial.println("Missing url parameter");
|
||||
prepareResponseBuffer(SesameEvent::InvalidUrlParameter);
|
||||
prepareResponseBuffer(MessageResult::InvalidUrlParameter);
|
||||
return;
|
||||
}
|
||||
String encoded = request->getParam(messageUrlParameter)->value();
|
||||
if (!convertHexMessageToBinary(encoded.c_str())) {
|
||||
Serial.println("Invalid hex encoding");
|
||||
prepareResponseBuffer(SesameEvent::InvalidMessageSize);
|
||||
prepareResponseBuffer(MessageResult::InvalidMessageSize);
|
||||
return;
|
||||
}
|
||||
processMessage((AuthenticatedMessage*) receivedMessageBuffer);
|
||||
processMessage(&receivedLocalMessage);
|
||||
}
|
||||
|
||||
void SesameController::sendPreparedLocalResponse(AsyncWebServerRequest *request) {
|
||||
request->send_P(200, "application/octet-stream", responseBuffer, responseSize);
|
||||
Serial.printf("[INFO] Local response %u (%u bytes)\n", responseBuffer[0], responseSize);
|
||||
request->send_P(200, "application/octet-stream", (uint8_t*) &outgoingMessage, SIGNED_MESSAGE_SIZE);
|
||||
Serial.printf("[INFO] Local response %u\n", outgoingMessage.message.messageType);
|
||||
}
|
||||
|
||||
// MARK: Server
|
||||
|
||||
void SesameController::sendServerError(SesameEvent event) {
|
||||
prepareResponseBuffer(event);
|
||||
sendPreparedServerResponse();
|
||||
void SesameController::sendServerError(MessageResult result) {
|
||||
prepareResponseBuffer(result); // No message to echo
|
||||
sendPreparedResponseToServer();
|
||||
}
|
||||
|
||||
void SesameController::handleServerMessage(uint8_t* payload, size_t length) {
|
||||
if (length != AUTHENTICATED_MESSAGE_SIZE) {
|
||||
prepareResponseBuffer(SesameEvent::InvalidMessageSize);
|
||||
if (length != SIGNED_MESSAGE_SIZE) {
|
||||
// No message saved to discard, don't accidentally delete for other operation
|
||||
sendServerError(MessageResult::InvalidMessageSize);
|
||||
return;
|
||||
}
|
||||
|
||||
processMessage((AuthenticatedMessage*) payload);
|
||||
sendPreparedServerResponse();
|
||||
processMessage((SignedMessage*) payload);
|
||||
sendPreparedResponseToServer();
|
||||
}
|
||||
|
||||
void SesameController::sendPreparedServerResponse() {
|
||||
server.sendResponse(responseBuffer, responseSize);
|
||||
Serial.printf("[INFO] Server response %u (%u bytes)\n", responseBuffer[0], responseSize);
|
||||
void SesameController::sendPreparedResponseToServer() {
|
||||
server.sendResponse((uint8_t*) &outgoingMessage, SIGNED_MESSAGE_SIZE);
|
||||
Serial.printf("[INFO] Server response %u\n", outgoingMessage.message.messageType);
|
||||
}
|
||||
|
||||
// MARK: Message handling
|
||||
|
||||
void SesameController::processMessage(AuthenticatedMessage* message) {
|
||||
SesameEvent event = verifyAndProcessReceivedMessage(message);
|
||||
prepareResponseBuffer(event, message->message.device);
|
||||
void SesameController::processMessage(SignedMessage* message) {
|
||||
// Result must be empty
|
||||
if (message->message.result != MessageResult::MessageAccepted) {
|
||||
prepareResponseBuffer(MessageResult::ClientChallengeInvalid);
|
||||
return;
|
||||
}
|
||||
if (!isAuthenticMessage(message, keyConfig.remoteKey)) {
|
||||
prepareResponseBuffer(MessageResult::MessageAuthenticationFailed);
|
||||
return;
|
||||
}
|
||||
switch (message->message.messageType) {
|
||||
case MessageType::initial:
|
||||
prepareChallenge(&message->message);
|
||||
return;
|
||||
case MessageType::request:
|
||||
completeUnlockRequest(&message->message);
|
||||
return;
|
||||
default:
|
||||
prepareResponseBuffer(MessageResult::InvalidMessageType);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Process a received message.
|
||||
*
|
||||
* Checks whether the received data is a valid,
|
||||
* and then signals that the motor should move.
|
||||
*
|
||||
* @param message The message received from the remote
|
||||
* @return The response to signal to the server.
|
||||
*/
|
||||
SesameEvent SesameController::verifyAndProcessReceivedMessage(AuthenticatedMessage* message) {
|
||||
if (!isAuthenticMessage(message, keyConfig.remoteKey, keySize)) {
|
||||
return SesameEvent::MessageAuthenticationFailed;
|
||||
void SesameController::prepareChallenge(Message* message) {
|
||||
// Server challenge must be empty
|
||||
if (message->serverChallenge != 0) {
|
||||
prepareResponseBuffer(MessageResult::ClientChallengeInvalid);
|
||||
return;
|
||||
}
|
||||
if (!storage.isDeviceIdValid(message->message.device)) {
|
||||
return SesameEvent::MessageDeviceInvalid;
|
||||
}
|
||||
if (!storage.isMessageCounterValid(message->message.id, message->message.device)) {
|
||||
return SesameEvent::MessageCounterInvalid;
|
||||
}
|
||||
if (!timeCheck.isMessageTimeAcceptable(message->message.time)) {
|
||||
return SesameEvent::MessageTimeMismatch;
|
||||
if (hasCurrentChallenge()) {
|
||||
Serial.println("[INFO] Overwriting old challenge");
|
||||
}
|
||||
|
||||
storage.didUseMessageCounter(message->message.id, message->message.device);
|
||||
// Set challenge and respond
|
||||
currentClientChallenge = message->clientChallenge;
|
||||
currentServerChallenge = randomChallenge();
|
||||
currentChallengeExpiry = currentTime + keyConfig.challengeExpiryMs;
|
||||
|
||||
prepareResponseBuffer(MessageResult::MessageAccepted, message);
|
||||
}
|
||||
|
||||
void SesameController::completeUnlockRequest(Message* message) {
|
||||
if (!hasCurrentChallenge()) {
|
||||
prepareResponseBuffer(MessageResult::ClientChallengeInvalid, message);
|
||||
return;
|
||||
}
|
||||
// Client and server challenge must match
|
||||
if (message->clientChallenge != currentClientChallenge) {
|
||||
prepareResponseBuffer(MessageResult::ClientChallengeInvalid, message);
|
||||
return;
|
||||
}
|
||||
if (message->serverChallenge != currentServerChallenge) {
|
||||
prepareResponseBuffer(MessageResult::ServerChallengeMismatch, message);
|
||||
return;
|
||||
}
|
||||
clearCurrentChallenge();
|
||||
|
||||
// Move servo
|
||||
servo.pressButton();
|
||||
Serial.printf("[Info] Accepted message %d\n", message->message.id);
|
||||
return SesameEvent::MessageAccepted;
|
||||
prepareResponseBuffer(MessageResult::MessageAccepted, message);
|
||||
Serial.println("[INFO] Accepted message");
|
||||
}
|
||||
|
||||
bool allowMessageResponse(SesameEvent event) {
|
||||
switch (event) {
|
||||
case SesameEvent::MessageTimeMismatch:
|
||||
case SesameEvent::MessageCounterInvalid:
|
||||
case SesameEvent::MessageAccepted:
|
||||
case SesameEvent::MessageDeviceInvalid:
|
||||
return true;
|
||||
default:
|
||||
return false;
|
||||
void SesameController::prepareResponseBuffer(MessageResult result, Message* message) {
|
||||
outgoingMessage.message.result = result;
|
||||
if (message != NULL) {
|
||||
outgoingMessage.message.clientChallenge = message->clientChallenge;
|
||||
outgoingMessage.message.serverChallenge = message->serverChallenge;
|
||||
// All outgoing messages are responses, except if an initial message is accepted
|
||||
if (message->messageType == MessageType::initial && result == MessageResult::MessageAccepted) {
|
||||
outgoingMessage.message.messageType = MessageType::challenge;
|
||||
} else {
|
||||
outgoingMessage.message.messageType = MessageType::response;
|
||||
}
|
||||
} else {
|
||||
outgoingMessage.message.clientChallenge = message->clientChallenge;
|
||||
outgoingMessage.message.serverChallenge = message->serverChallenge;
|
||||
outgoingMessage.message.messageType = MessageType::response;
|
||||
}
|
||||
}
|
||||
|
||||
void SesameController::prepareResponseBuffer(SesameEvent event, uint8_t deviceId) {
|
||||
*responseStatus = event;
|
||||
responseSize = 1;
|
||||
if (!allowMessageResponse(event)) {
|
||||
return;
|
||||
}
|
||||
responseMessage->message.time = timeCheck.getEpochTime();
|
||||
responseMessage->message.id = storage.getNextMessageCounter(deviceId);
|
||||
responseMessage->message.device = deviceId;
|
||||
|
||||
if (!authenticateMessage(responseMessage, keyConfig.localKey, keySize)) {
|
||||
*responseStatus = SesameEvent::InvalidResponseAuthentication;
|
||||
return;
|
||||
}
|
||||
responseSize += AUTHENTICATED_MESSAGE_SIZE;
|
||||
}
|
||||
|
||||
// MARK: Reconnecting
|
||||
|
||||
void SesameController::ensureWiFiConnection(uint32_t millis) {
|
||||
static uint32_t nextWifiReconnect = 0;
|
||||
// Reconnect to WiFi
|
||||
if(millis > nextWifiReconnect && WiFi.status() != WL_CONNECTED) {
|
||||
Serial.println("[INFO] Reconnecting WiFi...");
|
||||
WiFi.setHostname(wifiConfig.networkName);
|
||||
WiFi.begin(wifiConfig.ssid, wifiConfig.password);
|
||||
isReconnecting = true;
|
||||
nextWifiReconnect = millis + wifiConfig.reconnectInterval;
|
||||
if (!authenticateMessage(&outgoingMessage, keyConfig.localKey)) {
|
||||
Serial.println("[ERROR] Failed to sign message");
|
||||
}
|
||||
}
|
||||
|
||||
void SesameController::ensureWebSocketConnection() {
|
||||
/*
|
||||
if (isReconnecting && WiFi.status() == WL_CONNECTED) {
|
||||
isReconnecting = false;
|
||||
Serial.print("WiFi IP address: ");
|
||||
@ -185,12 +210,22 @@ void SesameController::ensureWebSocketConnection() {
|
||||
timeCheck.printLocalTime();
|
||||
localWebServer.begin();
|
||||
}
|
||||
*/
|
||||
}
|
||||
|
||||
// MARK: Helper
|
||||
|
||||
// Based on https://stackoverflow.com/a/23898449/266720
|
||||
/**
|
||||
* @brief
|
||||
*
|
||||
* Based on https://stackoverflow.com/a/23898449/266720
|
||||
*
|
||||
* @param str
|
||||
* @return true
|
||||
* @return false
|
||||
*/
|
||||
bool SesameController::convertHexMessageToBinary(const char* str) {
|
||||
uint8_t* buffer = (uint8_t*) &receivedLocalMessage;
|
||||
// TODO: Fail if invalid hex values are used
|
||||
uint8_t idx0, idx1;
|
||||
|
||||
@ -203,7 +238,7 @@ bool SesameController::convertHexMessageToBinary(const char* str) {
|
||||
};
|
||||
|
||||
size_t len = strlen(str);
|
||||
if (len != AUTHENTICATED_MESSAGE_SIZE * 2) {
|
||||
if (len != SIGNED_MESSAGE_SIZE * 2) {
|
||||
// Require exact message size
|
||||
return false;
|
||||
}
|
||||
@ -211,17 +246,7 @@ bool SesameController::convertHexMessageToBinary(const char* str) {
|
||||
for (size_t pos = 0; pos < len; pos += 2) {
|
||||
idx0 = ((uint8_t)str[pos+0] & 0x1F) ^ 0x10;
|
||||
idx1 = ((uint8_t)str[pos+1] & 0x1F) ^ 0x10;
|
||||
receivedMessageBuffer[pos/2] = (uint8_t)(hashmap[idx0] << 4) | hashmap[idx1];
|
||||
buffer[pos/2] = (uint8_t)(hashmap[idx0] << 4) | hashmap[idx1];
|
||||
};
|
||||
return true;
|
||||
}
|
||||
|
||||
void SesameController::periodicallyReconnectWifiAndSocket(uint32_t millis) {
|
||||
static uint32_t nextWifiReconnect = wifiConfig.periodicReconnectInterval;
|
||||
if (millis > nextWifiReconnect) {
|
||||
nextWifiReconnect += wifiConfig.periodicReconnectInterval;
|
||||
|
||||
server.disconnect();
|
||||
WiFi.disconnect();
|
||||
}
|
||||
}
|
||||
@ -1,8 +1,19 @@
|
||||
#include "crypto.h"
|
||||
#include "config.h"
|
||||
#include <string.h>
|
||||
#include <mbedtls/md.h>
|
||||
#include <esp_random.h>
|
||||
#include <bootloader_random.h>
|
||||
|
||||
bool authenticateData(const uint8_t* data, size_t dataLength, uint8_t* mac, const uint8_t* key, size_t keyLength) {
|
||||
void enableCrypto() {
|
||||
bootloader_random_enable();
|
||||
}
|
||||
|
||||
uint32_t randomChallenge() {
|
||||
return esp_random();
|
||||
}
|
||||
|
||||
bool authenticateData(const uint8_t* data, size_t dataLength, uint8_t* mac, const uint8_t* key) {
|
||||
mbedtls_md_context_t ctx;
|
||||
mbedtls_md_type_t md_type = MBEDTLS_MD_SHA256;
|
||||
int result;
|
||||
@ -12,7 +23,7 @@ bool authenticateData(const uint8_t* data, size_t dataLength, uint8_t* mac, cons
|
||||
if (result) {
|
||||
return false;
|
||||
}
|
||||
result = mbedtls_md_hmac_starts(&ctx, key, keyLength);
|
||||
result = mbedtls_md_hmac_starts(&ctx, key, keySize);
|
||||
if (result) {
|
||||
return false;
|
||||
}
|
||||
@ -28,17 +39,17 @@ bool authenticateData(const uint8_t* data, size_t dataLength, uint8_t* mac, cons
|
||||
return true;
|
||||
}
|
||||
|
||||
bool authenticateMessage(Message* message, uint8_t* mac, const uint8_t* key, size_t keyLength) {
|
||||
return authenticateData((const uint8_t*) message, MESSAGE_CONTENT_SIZE, mac, key, keyLength);
|
||||
bool authenticateMessage(Message* message, uint8_t* mac, const uint8_t* key) {
|
||||
return authenticateData((const uint8_t*) message, MESSAGE_CONTENT_SIZE, mac, key);
|
||||
}
|
||||
|
||||
bool authenticateMessage(AuthenticatedMessage* message, const uint8_t* key, size_t keyLength) {
|
||||
return authenticateMessage(&message->message, message->mac, key, keyLength);
|
||||
bool authenticateMessage(SignedMessage* message, const uint8_t* key) {
|
||||
return authenticateMessage(&message->message, message->mac, key);
|
||||
}
|
||||
|
||||
bool isAuthenticMessage(AuthenticatedMessage* message, const uint8_t* key, size_t keyLength) {
|
||||
bool isAuthenticMessage(SignedMessage* message, const uint8_t* key) {
|
||||
uint8_t mac[SHA256_MAC_SIZE];
|
||||
if (!authenticateMessage(&message->message, mac, key, keyLength)) {
|
||||
if (!authenticateMessage(&message->message, mac, key)) {
|
||||
return false;
|
||||
}
|
||||
return memcmp(mac, message->mac, SHA256_MAC_SIZE) == 0;
|
||||
|
||||
@ -1,49 +0,0 @@
|
||||
#include "fresh.h"
|
||||
|
||||
#include <Arduino.h> // configTime()
|
||||
#include <time.h>
|
||||
|
||||
TimeCheck::TimeCheck() { }
|
||||
|
||||
void TimeCheck::configure(TimeConfiguration configuration) {
|
||||
config = configuration;
|
||||
}
|
||||
|
||||
void TimeCheck::startNTP() {
|
||||
configTime(config.offsetToGMT, config.offsetDaylightSavings, config.ntpServerUrl);
|
||||
}
|
||||
|
||||
void TimeCheck::printLocalTime() {
|
||||
struct tm timeinfo;
|
||||
if (getLocalTime(&timeinfo)) {
|
||||
Serial.println(&timeinfo, "[INFO] Time is %A, %d. %B %Y %H:%M:%S");
|
||||
} else {
|
||||
Serial.println("[WARN] No local time available");
|
||||
}
|
||||
}
|
||||
|
||||
uint32_t TimeCheck::getEpochTime() {
|
||||
time_t now;
|
||||
struct tm timeinfo;
|
||||
if (!getLocalTime(&timeinfo)) {
|
||||
Serial.println("[WARN] Failed to obtain local time");
|
||||
return(0);
|
||||
}
|
||||
time(&now);
|
||||
return now;
|
||||
}
|
||||
|
||||
bool TimeCheck::isMessageTimeAcceptable(uint32_t t) {
|
||||
uint32_t localTime = getEpochTime();
|
||||
if (localTime == 0) {
|
||||
Serial.println("No epoch time available");
|
||||
return false;
|
||||
}
|
||||
if (t > localTime + config.allowedTimeOffset) {
|
||||
return false;
|
||||
}
|
||||
if (t < localTime - config.allowedTimeOffset) {
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
31
src/main.cpp
31
src/main.cpp
@ -13,7 +13,7 @@
|
||||
#include "controller.h"
|
||||
#include "config.h"
|
||||
|
||||
SesameController controller(localPort, remoteDeviceCount);
|
||||
SesameController controller(localPort);
|
||||
|
||||
void setup() {
|
||||
Serial.begin(serialBaudRate);
|
||||
@ -37,27 +37,28 @@ void setup() {
|
||||
.reconnectTime = 5000,
|
||||
};
|
||||
|
||||
TimeConfiguration timeConfig {
|
||||
.offsetToGMT = timeOffsetToGMT,
|
||||
.offsetDaylightSavings = timeOffsetDaylightSavings,
|
||||
.ntpServerUrl = ntpServerUrl,
|
||||
.allowedTimeOffset = 60,
|
||||
};
|
||||
|
||||
WifiConfiguration wifiConfig {
|
||||
.ssid = wifiSSID,
|
||||
.password = wifiPassword,
|
||||
.networkName = networkName,
|
||||
.reconnectInterval = wifiReconnectInterval,
|
||||
.periodicReconnectInterval = wifiPeriodicReconnectInterval,
|
||||
EthernetConfiguration ethernetConfig {
|
||||
.macAddress = ethernetMacAddress,
|
||||
.spiPinMiso = spiPinMiso,
|
||||
.spiPinMosi = spiPinMosi,
|
||||
.spiPinSclk = spiPinSclk,
|
||||
.spiPinSS = spiPinSS,
|
||||
.dhcpLeaseTimeoutMs = dhcpLeaseTimeoutMs,
|
||||
.dhcpLeaseResponseTimeoutMs = dhcpLeaseResponseTimeoutMs,
|
||||
.manualIp = manualIpAddress,
|
||||
.manualDnsAddress = manualDnsServerAddress,
|
||||
.socketHeartbeatIntervalMs = socketHeartbeatIntervalMs,
|
||||
.socketHeartbeatTimeoutMs = socketHeartbeatTimeoutMs,
|
||||
.socketHeartbeatFailureReconnectCount = socketHeartbeatFailureReconnectCount,
|
||||
};
|
||||
|
||||
KeyConfiguration keyConfig {
|
||||
.remoteKey = remoteKey,
|
||||
.localKey = localKey,
|
||||
.challengeExpiryMs = challengeExpiryMs,
|
||||
};
|
||||
|
||||
controller.configure(servoConfig, serverConfig, timeConfig, wifiConfig, keyConfig);
|
||||
controller.configure(servoConfig, serverConfig, ethernetConfig, keyConfig);
|
||||
}
|
||||
|
||||
void loop() {
|
||||
|
||||
@ -48,7 +48,7 @@ switch(type) {
|
||||
webSocket.enableHeartbeat(pingInterval, pongTimeout, disconnectTimeoutCount);
|
||||
break;
|
||||
case WStype_TEXT:
|
||||
controller->sendServerError(SesameEvent::TextReceived);
|
||||
controller->sendServerError(MessageResult::TextReceived);
|
||||
break;
|
||||
case WStype_BIN:
|
||||
controller->handleServerMessage(payload, length);
|
||||
@ -61,7 +61,7 @@ switch(type) {
|
||||
case WStype_FRAGMENT_BIN_START:
|
||||
case WStype_FRAGMENT:
|
||||
case WStype_FRAGMENT_FIN:
|
||||
controller->sendServerError(SesameEvent::UnexpectedSocketEvent);
|
||||
controller->sendServerError(MessageResult::UnexpectedSocketEvent);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
@ -1,53 +0,0 @@
|
||||
#include "storage.h"
|
||||
#include "message.h"
|
||||
#include <EEPROM.h>
|
||||
|
||||
void Storage::configure() {
|
||||
EEPROM.begin(messageCounterSize * remoteDeviceCount);
|
||||
}
|
||||
|
||||
bool Storage::isDeviceIdValid(uint8_t deviceId) {
|
||||
return deviceId < remoteDeviceCount;
|
||||
}
|
||||
|
||||
bool Storage::isMessageCounterValid(uint32_t counter, uint8_t deviceId) {
|
||||
return counter >= getNextMessageCounter(deviceId);
|
||||
}
|
||||
|
||||
void Storage::didUseMessageCounter(uint32_t counter, uint8_t deviceId) {
|
||||
// Store the next counter, so that resetting starts at 0
|
||||
setMessageCounter(counter+1, deviceId);
|
||||
}
|
||||
|
||||
void Storage::setMessageCounter(uint32_t counter, uint8_t deviceId) {
|
||||
int offset = deviceId * messageCounterSize;
|
||||
EEPROM.write(offset + 0, (counter >> 24) & 0xFF);
|
||||
EEPROM.write(offset + 1, (counter >> 16) & 0xFF);
|
||||
EEPROM.write(offset + 2, (counter >> 8) & 0xFF);
|
||||
EEPROM.write(offset + 3, counter & 0xFF);
|
||||
EEPROM.commit();
|
||||
}
|
||||
|
||||
uint32_t Storage::getNextMessageCounter(uint8_t deviceId) {
|
||||
int offset = deviceId * messageCounterSize;
|
||||
uint32_t counter = (uint32_t) EEPROM.read(offset + 0) << 24;
|
||||
counter += (uint32_t) EEPROM.read(offset + 1) << 16;
|
||||
counter += (uint32_t) EEPROM.read(offset + 2) << 8;
|
||||
counter += (uint32_t) EEPROM.read(offset + 3);
|
||||
return counter;
|
||||
}
|
||||
|
||||
void Storage::printMessageCounters() {
|
||||
Serial.print("[INFO] Next message numbers:");
|
||||
for (uint8_t i = 0; i < remoteDeviceCount; i += 1) {
|
||||
Serial.printf(" %u", getNextMessageCounter(i));
|
||||
}
|
||||
Serial.println("");
|
||||
}
|
||||
|
||||
void Storage::resetMessageCounters() {
|
||||
for (uint8_t i = 0; i < remoteDeviceCount; i += 1) {
|
||||
setMessageCounter(0, i);
|
||||
}
|
||||
Serial.println("[WARN] Message counters reset");
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user