feat: initialize web host and implement background AccountEnforcementService for RADIUS account monitoring

radiuscontroller/Program.cs

@@ -15,6 +15,7 @@ builder.Services.AddDbContext<RadiusDbContext>(options =>
 // Add services
 builder.Services.AddScoped<IRadiusService, RadiusService>();
 builder.Services.AddScoped<AdminAuthService>();
+builder.Services.AddHostedService<AccountEnforcementService>();
 
 // Add Razor components
 builder.Services.AddRazorComponents()

radiuscontroller/Services/AccountEnforcementService.cs

@@ -0,0 +1,119 @@
+using Microsoft.EntityFrameworkCore;
+using radiuscontroller.Data;
+using radiuscontroller.Models;
+
+namespace radiuscontroller.Services;
+
+/// <summary>
+/// Background service that periodically checks all active guest accounts
+/// and disables them if their time has expired or data cap has been reached.
+/// Time starts from the moment the user was created (guest_profiles.created_at).
+/// </summary>
+public class AccountEnforcementService : BackgroundService
+{
+    private readonly IServiceScopeFactory _scopeFactory;
+    private readonly ILogger<AccountEnforcementService> _logger;
+    private static readonly TimeSpan CheckInterval = TimeSpan.FromSeconds(30);
+
+    public AccountEnforcementService(IServiceScopeFactory scopeFactory, ILogger<AccountEnforcementService> logger)
+    {
+        _scopeFactory = scopeFactory;
+        _logger = logger;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        _logger.LogInformation("AccountEnforcementService started. Checking every {Interval}s.", CheckInterval.TotalSeconds);
+
+        // Wait a bit for the app to fully start
+        await Task.Delay(TimeSpan.FromSeconds(10), stoppingToken);
+
+        while (!stoppingToken.IsCancellationRequested)
+        {
+            try
+            {
+                await EnforceAccountLimitsAsync(stoppingToken);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Error during account enforcement check.");
+            }
+
+            await Task.Delay(CheckInterval, stoppingToken);
+        }
+    }
+
+    private async Task EnforceAccountLimitsAsync(CancellationToken ct)
+    {
+        using var scope = _scopeFactory.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<RadiusDbContext>();
+
+        var activeProfiles = await db.GuestProfiles
+            .Where(p => p.Status == "Active")
+            .ToListAsync(ct);
+
+        if (activeProfiles.Count == 0) return;
+
+        var now = DateTime.UtcNow;
+        var disabledCount = 0;
+
+        foreach (var profile in activeProfiles)
+        {
+            string? reason = null;
+
+            // 1. Check time expiration: created_at + session_time_minutes
+            var expiresAt = profile.CreatedAt.AddMinutes(profile.SessionTimeMinutes);
+            if (now >= expiresAt)
+            {
+                reason = "Time expired";
+            }
+
+            // 2. Check data cap: sum acctinputoctets + acctoutputoctets from radacct
+            if (reason == null && profile.DataLimitMb > 0)
+            {
+                var totalOctets = await db.RadAcct
+                    .Where(ra => ra.Username == profile.Username)
+                    .SumAsync(ra => (ra.AcctInputOctets ?? 0) + (ra.AcctOutputOctets ?? 0), ct);
+
+                long dataLimitBytes = profile.DataLimitMb * 1024 * 1024;
+                if (totalOctets >= dataLimitBytes)
+                {
+                    reason = $"Data cap reached ({totalOctets / (1024 * 1024)} MB / {profile.DataLimitMb} MB)";
+                }
+            }
+
+            if (reason != null)
+            {
+                // Disable the account
+                profile.Status = "Expired";
+
+                // Remove Cleartext-Password from radcheck so FreeRADIUS rejects future auth
+                var checks = await db.RadCheck
+                    .Where(rc => rc.Username == profile.Username)
+                    .ToListAsync(ct);
+                db.RadCheck.RemoveRange(checks);
+
+                // Insert Auth-Type := Reject to explicitly deny
+                db.RadCheck.Add(new RadCheck
+                {
+                    Username = profile.Username,
+                    Attribute = "Auth-Type",
+                    Op = ":=",
+                    Value = "Reject"
+                });
+
+                _logger.LogInformation(
+                    "Account '{Username}' disabled. Reason: {Reason}",
+                    profile.Username, reason);
+
+                disabledCount++;
+            }
+        }
+
+        if (disabledCount > 0)
+        {
+            await db.SaveChangesAsync(ct);
+            _logger.LogInformation("Enforcement check complete. {Count} account(s) disabled.", disabledCount);
+        }
+    }
+}