playing with some ideas for security management

data/config/securitySettings.json

@@ -1,5 +1,6 @@
 {
     "jwt_secret":"esp8266-react",
+    "roles": ["admin", "guest"],
     "users": [
         {
             "username": "admin",

src/SecurityManager.cpp

@@ -1,51 +1,84 @@
 #include <SecurityManager.h>
 
 SecurityManager::SecurityManager(AsyncWebServer* server, FS* fs) : SettingsPersistence(fs, SECURITY_SETTINGS_FILE) {
+  server->on(USERS_PATH, HTTP_GET, std::bind(&SecurityManager::fetchUsers, this, std::placeholders::_1));
 }
 
 SecurityManager::~SecurityManager() {}
 
 void SecurityManager::readFromJsonObject(JsonObject& root) {
+  // secret  
   _jwtSecret = root["jwt_secret"] | DEFAULT_JWT_SECRET;
 
-  while (_numUsers > 0){
+  // roles
-    delete _users[--_numUsers];
+  _roles.clear();
+  if (root["roles"].is<JsonArray>()) {
+    JsonArray roles = root["roles"];
+    for (JsonVariant role : roles) {
+      _roles.push_back(role.as<String>());
+    }
   }
 
+  // users
+  _users.clear();
   if (root["users"].is<JsonArray>()) {
     JsonArray users = root["users"];
-    _numUsers = 0;
+    for (JsonVariant user : users) {
-    // TODO - complete defence against bad data
+      String username =  user["username"];
-    for (int i =0; i < min(SECURITY_MANAGER_MAX_USERS, (int) users.size()); i++){
-      JsonObject user = users[i];
-      String username =  user["username"];;
       String password = user["password"];
       String role = user["role"];
-      _users[_numUsers++] = new User(username, password, role);
+      _users.push_back(User(username, password, role));
     }
   }
 }
 
 void SecurityManager::writeToJsonObject(JsonObject& root) {
-  // TODO
+  // secret
+  root["jwt_secret"] = _jwtSecret;
+
+  // roles
+  JsonArray roles = root.createNestedArray("roles");
+  for (String _role : _roles) {
+    roles.add(_role);
+  }
+
+  // users
+  JsonArray users = root.createNestedArray("users");
+  for (User _user : _users) {
+    JsonObject user = users.createNestedObject();
+    user["username"] = _user.getUsername();
+    user["password"] = _user.getPassword();
+    user["role"] = _user.getRole();
+  }
+}
+
+void SecurityManager::fetchUsers(AsyncWebServerRequest *request) {
+  AsyncJsonResponse * response = new AsyncJsonResponse(MAX_USERS_SIZE);
+  JsonObject jsonObject = response->getRoot();  
+  writeToJsonObject(jsonObject);
+  response->setLength();
+  request->send(response);
 }
 
 void SecurityManager::begin() {
-  // TODO
+  readFromFS();
 }
 
 User SecurityManager::verifyUser(String jwt) {
   // TODO
   return NOT_AUTHENTICATED;
 }
-User authenticate(String username, String password) {
+
-  // TODO
+User SecurityManager::authenticate(String username, String password) {
+  for (User _user : _users) {
+    if (_user.getUsername() == username && _user.getPassword() == password){
+      return _user;
+    }
+  }
   return NOT_AUTHENTICATED;
 }
 
-String generateJWT(User user) {
+String SecurityManager::generateJWT(User user) {
   // TODO
   return "";
 }
-
-

src/SecurityManager.h

@@ -1,5 +1,8 @@
-#ifndef APSettingsConfig_h
+#ifndef SecurityManager_h
-#define APSettingsConfig_h
+#define SecurityManager_h
+
+#include <list>
+#include <ArduinoJWT.h>
 
 #include <SettingsService.h>
 #include <DNSServer.h>
@@ -8,16 +11,17 @@
 #define DEFAULT_JWT_SECRET "esp8266-react"
 
 #define SECURITY_SETTINGS_FILE "/config/securitySettings.json"
+
+#define USERS_PATH "/rest/users"
 #define AUTHENTICATE_PATH "/rest/authenticate"
 
 #define SECURITY_MANAGER_MAX_USERS 5
 
-#define UNAUTHENTICATED_USERNAME ""
+#define UNAUTHENTICATED_USERNAME "_anonymous"
 #define UNAUTHENTICATED_PASSWORD ""
 #define UNAUTHENTICATED_ROLE ""
 
-#define ROLE_ADMIN "admin"
+#define MAX_USERS_SIZE 1024
-#define ROLE_GUEST "guest"
 
 class User {
   private:
@@ -38,9 +42,6 @@ class User {
     bool isAuthenticated() {
       return _username != UNAUTHENTICATED_USERNAME;
     }
-    bool isAdmin() {
-      return isAuthenticated() && _username == ROLE_ADMIN;
-    }
 };
 
 const User NOT_AUTHENTICATED = User(UNAUTHENTICATED_USERNAME, UNAUTHENTICATED_PASSWORD, UNAUTHENTICATED_ROLE);
@@ -55,7 +56,7 @@ class SecurityManager :  public SettingsPersistence {
     void begin();
 
     User verifyUser(String jwt);
-    User authenticate();
+    User authenticate(String username, String password);
     String generateJWT(User user);
 
   protected:
@@ -65,10 +66,17 @@ class SecurityManager :  public SettingsPersistence {
 
   private:
 
+    // server instance
+    AsyncWebServer* _server;
+
     // access point settings
     String _jwtSecret;
-    User *_users[SECURITY_MANAGER_MAX_USERS];
+    std::list<String> _roles;
-    int _numUsers;
+    std::list<User> _users;
+
+    // endpoint functions
+    void fetchUsers(AsyncWebServerRequest *request);
+
 };
 
-#endif // end APSettingsConfig_h
+#endif // end SecurityManager_h

src/main.cpp

@@ -18,11 +18,14 @@
 #include <NTPStatus.h>
 #include <OTASettingsService.h>
 #include <APStatus.h>
+#include <SecurityManager.h>
 
 #define SERIAL_BAUD_RATE 115200
 
 AsyncWebServer server(80);
 
+SecurityManager securityManager = SecurityManager(&server, &SPIFFS);
+
 WiFiSettingsService wifiSettingsService = WiFiSettingsService(&server, &SPIFFS);
 APSettingsService apSettingsService = APSettingsService(&server, &SPIFFS);
 NTPSettingsService ntpSettingsService = NTPSettingsService(&server, &SPIFFS);
@@ -40,6 +43,9 @@ void setup() {
     Serial.begin(SERIAL_BAUD_RATE);
     SPIFFS.begin();
 
+    // start security manager
+    securityManager.begin();
+
     // start services
     ntpSettingsService.begin();
     otaSettingsService.begin();