/// <summary>
/// Initializes a new instance of the <see cref="DkimSigningRoutingAgent"/> class.
/// </summary>
/// <param name="dkimSigner">The object that knows how to sign messages.</param>
public DkimSigningRoutingAgent()
{
Logger.LogDebug("Initializing DkimSigner");
Settings config = new Settings();
config.InitHeadersToSign();
this.dkimSigner = new DkimSigner();
this.LoadSettings();
this.WatchSettings();
this.OnCategorizedMessage += this.WhenMessageCategorized;
Logger.LogDebug("DkimSigner initiallized");
}
public static Settings LoadOrCreate(string FileName)
{
if (!System.IO.File.Exists(FileName))
{
// default settings
Settings s = new Settings();
s.HeadersToSign = new List<string>(new string[] {"From","Subject","To","Date","Message-ID"});
return s;
}
else
{
return Load(FileName);
}
}
/// <summary>
/// Load the current configuration for Exchange DkimSigner from the registry
/// </summary>
private void LoadDkimSignerConfig()
{
try
{
this.oConfig = Settings.LoadOrCreate(Path.Combine(Constants.DKIM_SIGNER_PATH, "settings.xml"));
switch (this.oConfig.Loglevel)
{
case 1:
this.cbLogLevel.Text = "Error";
break;
case 2:
this.cbLogLevel.Text = "Warning";
break;
case 3:
this.cbLogLevel.Text = "Information";
break;
default:
this.cbLogLevel.Text = "Information";
MessageBox.Show("The log level is invalid. The log level have been set to Information.");
break;
}
this.rbRsaSha1.Checked = (oConfig.SigningAlgorithm == DkimAlgorithmKind.RsaSha1);
this.rbSimpleHeaderCanonicalization.Checked = (this.oConfig.HeaderCanonicalization == DkimCanonicalizationKind.Simple);
this.rbRelaxedHeaderCanonicalization.Checked = (this.oConfig.HeaderCanonicalization == DkimCanonicalizationKind.Relaxed);
this.rbSimpleBodyCanonicalization.Checked = (this.oConfig.BodyCanonicalization == DkimCanonicalizationKind.Simple);
this.rbRelaxedBodyCanonicalization.Checked = (this.oConfig.BodyCanonicalization == DkimCanonicalizationKind.Relaxed);
this.lbxHeadersToSign.Items.Clear();
foreach (string sItem in this.oConfig.HeadersToSign)
{
this.lbxHeadersToSign.Items.Add(sItem);
}
this.lbxHeadersToSign.SelectedItem = null;
this.ReloadDomainsList();
this.bDataUpdated = false;
}
catch (Exception e)
{
MessageBox.Show("Couldn't load the settings file:\n" + e.Message + "\nSetting it to default values.", "Settings error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
/// <summary>
/// Load the current configuration for Exchange DkimSigner from the registry
/// </summary>
private void LoadDkimSignerConfig()
{
this.oConfig = new Settings();
this.oConfig.InitHeadersToSign();
if (!this.oConfig.Load(Path.Combine(Constants.DKIM_SIGNER_PATH, "settings.xml")))
{
this.ShowMessageBox("Settings error", "Couldn't load the settings file.\n Setting it to default values.", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
//
// Log level
//
switch (this.oConfig.Loglevel)
{
case 1:
this.cbLogLevel.Text = "Error";
break;
case 2:
this.cbLogLevel.Text = "Warning";
break;
case 3:
this.cbLogLevel.Text = "Information";
break;
case 4:
this.cbLogLevel.Text = "Debug";
break;
default:
this.cbLogLevel.Text = "Information";
this.ShowMessageBox("Information", "The log level is invalid. Set to default: Information.", MessageBoxButtons.OK, MessageBoxIcon.Information);
break;
}
//
// Algorithm and Canonicalization
//
this.rbRsaSha1.Checked = (oConfig.SigningAlgorithm == DkimAlgorithmKind.RsaSha1);
this.rbSimpleHeaderCanonicalization.Checked = (this.oConfig.HeaderCanonicalization == DkimCanonicalizationKind.Simple);
this.rbRelaxedHeaderCanonicalization.Checked = (this.oConfig.HeaderCanonicalization == DkimCanonicalizationKind.Relaxed);
this.rbSimpleBodyCanonicalization.Checked = (this.oConfig.BodyCanonicalization == DkimCanonicalizationKind.Simple);
this.rbRelaxedBodyCanonicalization.Checked = (this.oConfig.BodyCanonicalization == DkimCanonicalizationKind.Relaxed);
//
// Headers to sign
//
this.lbxHeadersToSign.Items.Clear();
foreach (string sItem in this.oConfig.HeadersToSign)
{
this.lbxHeadersToSign.Items.Add(sItem);
}
//
// Domain
//
DomainElement oCurrentDomain = null;
if (this.lbxDomains.SelectedItem != null)
{
oCurrentDomain = (DomainElement) this.lbxDomains.SelectedItem;
}
this.lbxDomains.Items.Clear();
foreach (DomainElement oConfigDomain in this.oConfig.Domains)
{
this.lbxDomains.Items.Add(oConfigDomain);
}
if (oCurrentDomain != null)
{
this.lbxDomains.SelectedItem = oCurrentDomain;
}
this.bDataUpdated = false;
}
private void LoadSettings()
{
Settings config = new Settings();
config.InitHeadersToSign();
if(config.Load(Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "settings.xml")))
{
this.dkimSigner.UpdateSettings(config);
Logger.logLevel = config.Loglevel;
Logger.LogInformation("Exchange DKIM settings loaded: " + config.SigningAlgorithm.ToString() + ", Canonicalization Header Algorithm: " + config.HeaderCanonicalization.ToString() + ", Canonicalization Body Algorithm: " + config.BodyCanonicalization.ToString() + ", Number of domains: " + this.dkimSigner.GetDomains().Count);
}
else
{
Logger.LogError("Couldn't load the settings file.\n");
}
}
public void TestInitHeadersToSign()
{
Settings config = new Settings();
config.InitHeadersToSign();
Assert.AreEqual(new string[] { "From", "Subject", "To", "Date", "Message-ID" }, config.HeadersToSign);
}
public void UpdateSettings(Settings config)
{
// Load the list of domains
this.domains.Clear();
foreach (DomainElement domainElement in config.Domains)
{
try
{
if (domainElement.InitElement(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location)))
{
this.domains.Add(domainElement.Domain, domainElement);
}
}
catch (Exception e)
{
Logger.LogError(e.Message);
}
}
switch (config.SigningAlgorithm)
{
case DkimAlgorithmKind.RsaSha1:
this.hashAlgorithm = new SHA1CryptoServiceProvider();
this.hashAlgorithmCryptoCode = "SHA1";
this.hashAlgorithmDkimCode = "rsa-sha1";
break;
case DkimAlgorithmKind.RsaSha256:
this.hashAlgorithm = new SHA256CryptoServiceProvider();
this.hashAlgorithmCryptoCode = "SHA256";
this.hashAlgorithmDkimCode = "rsa-sha256";
break;
default:
throw new ArgumentOutOfRangeException("signatureKind");
}
this.headerCanonicalization = config.HeaderCanonicalization;
this.bodyCanonicalization = config.BodyCanonicalization;
this.eligibleHeaders = new HashSet<string>();
foreach (string headerToSign in config.HeadersToSign)
{
this.eligibleHeaders.Add(headerToSign.Trim());
}
// The From header must always be signed according to the
// DKIM specification.
if (!this.eligibleHeaders.Contains("From"))
{
this.eligibleHeaders.Add("From");
}
}
