feat: implement RadiusService to manage guest user registration, session limits, and RADIUS authentication attributes

radiuscontroller/Services/RadiusService.cs

@@ -106,13 +106,14 @@ public class RadiusService : IRadiusService
             Value = password
         });
 
-        // Set Session-Timeout to 60 seconds to force frequent re-authentication (validation)
+        // Set Session-Timeout to the full allowed time. When this expires, the AP will drop the user natively.
+        long sessionTimeoutSeconds = (long)config.DefaultSessionTimeMinutes * 60;
         _db.RadReply.Add(new RadReply
         {
             Username = username,
             Attribute = "Session-Timeout",
             Op = "=",
-            Value = "60"
+            Value = sessionTimeoutSeconds.ToString()
         });
 
         // Set Max-Octets (in bytes)
@@ -134,14 +135,7 @@ public class RadiusService : IRadiusService
             Value = "60"
         });
 
-        // Re-authenticate (instead of disconnect) when Session-Timeout fires
+
-        _db.RadReply.Add(new RadReply
-        {
-            Username = username,
-            Attribute = "Termination-Action",
-            Op = "=",
-            Value = "1"
-        });
 
         // Create Guest Profile record
         var profile = new GuestProfile
@@ -233,11 +227,11 @@ public class RadiusService : IRadiusService
         profile.SessionTimeMinutes = newSessionTimeMinutes;
         profile.DataLimitMb = newDataLimitMb;
 
-        // Ensure Session-Timeout is strictly 60 seconds for frequent validation
+        // Update RadReply Session-Timeout to the full allowed time
         var sessionReply = await _db.RadReply.FirstOrDefaultAsync(rr => rr.Username == profile.Username && rr.Attribute == "Session-Timeout");
         if (sessionReply != null)
         {
-            sessionReply.Value = "60";
+            sessionReply.Value = (newSessionTimeMinutes * 60).ToString();
         }
         else
         {
@@ -246,7 +240,7 @@ public class RadiusService : IRadiusService
                 Username = profile.Username,
                 Attribute = "Session-Timeout",
                 Op = "=",
-                Value = "60"
+                Value = (newSessionTimeMinutes * 60).ToString()
             });
         }
 
@@ -291,6 +285,9 @@ public class RadiusService : IRadiusService
         });
 
         await _db.SaveChangesAsync();
+
+        // Disconnect active sessions immediately
+        await DisconnectActiveSessionsAsync(profile.Username);
     }
 
     public async Task DeleteUserAsync(int profileId)
@@ -308,6 +305,9 @@ public class RadiusService : IRadiusService
         _db.GuestProfiles.Remove(profile);
 
         await _db.SaveChangesAsync();
+
+        // Disconnect active sessions immediately
+        await DisconnectActiveSessionsAsync(username);
     }
 
     public async Task ResetUserPasswordAsync(int profileId, string newPassword)
@@ -374,4 +374,43 @@ public class RadiusService : IRadiusService
         }
         return new string(result);
     }
+
+    private async Task DisconnectActiveSessionsAsync(string username)
+    {
+        var activeSessions = await _db.RadAcct
+            .Where(ra => ra.Username == username && ra.AcctStopTime == null)
+            .Select(ra => ra.NasIpAddress)
+            .Distinct()
+            .ToListAsync();
+
+        var radiusSecret = Environment.GetEnvironmentVariable("RADIUS_SECRET") ?? "radpass";
+
+        foreach (var nasIp in activeSessions)
+        {
+            if (string.IsNullOrWhiteSpace(nasIp)) continue;
+
+            try
+            {
+                var process = new System.Diagnostics.Process
+                {
+                    StartInfo = new System.Diagnostics.ProcessStartInfo
+                    {
+                        FileName = "sh",
+                        Arguments = $"-c \"echo 'User-Name={username}' | radclient -x {nasIp}:3799 disconnect '{radiusSecret}'\"",
+                        RedirectStandardOutput = true,
+                        RedirectStandardError = true,
+                        UseShellExecute = false,
+                        CreateNoWindow = true
+                    }
+                };
+                process.Start();
+                await process.WaitForExitAsync();
+                _logger.LogInformation("Sent manual RADIUS Disconnect-Request to NAS {NasIp} for user {Username}", nasIp, username);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Failed to send manual RADIUS Disconnect-Request to NAS {NasIp}", nasIp);
+            }
+        }
+    }
 }