| | | 1 | | using System.Security.Cryptography; |
| | | 2 | | |
| | | 3 | | namespace LOCKnet.Core.Security; |
| | | 4 | | |
| | | 5 | | /// <summary> |
| | | 6 | | /// Implementierung von <see cref="ISessionManager"/>. |
| | | 7 | | /// Thread-safe: alle Zugriffe auf den Session-Key sind durch ein Lock geschützt. |
| | | 8 | | /// </summary> |
| | | 9 | | public sealed class SessionManager : ISessionManager |
| | | 10 | | { |
| | 113 | 11 | | private readonly object _lock = new(); |
| | | 12 | | private byte[]? _sessionKey; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc/> |
| | | 15 | | public bool IsUnlocked |
| | | 16 | | { |
| | | 17 | | get |
| | 15 | 18 | | { |
| | 15 | 19 | | lock (_lock) |
| | 15 | 20 | | return _sessionKey is not null; |
| | 15 | 21 | | } |
| | | 22 | | } |
| | | 23 | | |
| | | 24 | | /// <inheritdoc/> |
| | | 25 | | public event EventHandler? Locked; |
| | | 26 | | |
| | | 27 | | /// <inheritdoc/> |
| | | 28 | | public byte[]? GetSessionKey() |
| | 78 | 29 | | { |
| | 78 | 30 | | lock (_lock) |
| | 78 | 31 | | return _sessionKey?.ToArray(); |
| | 78 | 32 | | } |
| | | 33 | | |
| | | 34 | | /// <inheritdoc/> |
| | | 35 | | public void Open(byte[] sessionKey) |
| | 54 | 36 | | { |
| | 54 | 37 | | ArgumentNullException.ThrowIfNull(sessionKey); |
| | 53 | 38 | | if (sessionKey.Length != 32) |
| | 1 | 39 | | throw new ArgumentException("Session-Key muss genau 32 Bytes lang sein.", nameof(sessionKey)); |
| | | 40 | | |
| | 52 | 41 | | var copy = sessionKey.ToArray(); |
| | 52 | 42 | | CryptographicOperations.ZeroMemory(sessionKey); |
| | | 43 | | |
| | 52 | 44 | | lock (_lock) |
| | 52 | 45 | | { |
| | | 46 | | // Alten Key sicher überschreiben falls vorhanden |
| | 52 | 47 | | if (_sessionKey is not null) |
| | 2 | 48 | | CryptographicOperations.ZeroMemory(_sessionKey); |
| | | 49 | | |
| | 52 | 50 | | _sessionKey = copy; |
| | 52 | 51 | | } |
| | 52 | 52 | | } |
| | | 53 | | |
| | | 54 | | /// <inheritdoc/> |
| | | 55 | | public void Lock() |
| | 41 | 56 | | { |
| | 41 | 57 | | lock (_lock) |
| | 41 | 58 | | { |
| | 41 | 59 | | if (_sessionKey is not null) |
| | 23 | 60 | | { |
| | 23 | 61 | | CryptographicOperations.ZeroMemory(_sessionKey); |
| | 23 | 62 | | _sessionKey = null; |
| | 23 | 63 | | } |
| | 41 | 64 | | } |
| | | 65 | | |
| | 41 | 66 | | Locked?.Invoke(this, EventArgs.Empty); |
| | 41 | 67 | | } |
| | | 68 | | } |