/// <summary>
/// Initializes a new instance of the <see cref="DkimSigningRoutingAgentFactory"/> class.
/// </summary>
public DkimSigningRoutingAgentFactory()
{
Logger.LogDebug("Initializing DkimSigner Service");
/*Logger.LogDebug("Waiting for debugger");
while (!System.Diagnostics.Debugger.IsAttached)
System.Threading.Thread.Sleep(100);
Logger.LogDebug("Debugger connected");*/
Settings config = new Settings();
config.InitHeadersToSign();
dkimSigner = new DkimSigner();
LoadSettings();
WatchSettings();
}
/// <summary>
/// Load the settings from the settings.xml file and apply the new settings to the dkimSigner instance.
/// </summary>
private void LoadSettings()
{
Settings config = new Settings();
config.InitHeadersToSign();
string assemblyDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
if (assemblyDir != null && config.Load(Path.Combine(assemblyDir, "settings.xml")))
{
dkimSigner.UpdateSettings(config);
Logger.LogLevel = config.Loglevel;
Logger.LogInformation("Exchange DKIM settings loaded: " + config.SigningAlgorithm + ", Canonicalization Header Algorithm: " + config.HeaderCanonicalization + ", Canonicalization Body Algorithm: " + config.BodyCanonicalization + ", Number of domains: " + dkimSigner.GetDomains().Count);
}
else
{
Logger.LogError("Couldn't load the settings file.\n");
}
}
public void UpdateSettings(Settings config)
{
lock (settingsMutex)
{
// Load the list of domains
domains.Clear();
DkimSignatureAlgorithm signatureAlgorithm;
switch (config.SigningAlgorithm)
{
case DkimAlgorithmKind.RsaSha1:
signatureAlgorithm = DkimSignatureAlgorithm.RsaSha1;
break;
case DkimAlgorithmKind.RsaSha256:
signatureAlgorithm = DkimSignatureAlgorithm.RsaSha256;
break;
default:
// ReSharper disable once NotResolvedInText
throw new ArgumentOutOfRangeException("config.SigningAlgorithm");
}
foreach (DomainElement domainElement in config.Domains)
{
string privateKey = domainElement.PrivateKeyPathAbsolute(
Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location));
if (String.IsNullOrEmpty(privateKey) || !File.Exists(privateKey))
{
Logger.LogError("The private key for domain " + domainElement.Domain + " wasn't found: " + privateKey + ". Ignoring domain.");
}
//check if the private key can be parsed
try
{
KeyHelper.ParseKeyPair(privateKey);
}
catch (Exception ex)
{
Logger.LogError("Couldn't load private key for domain " + domainElement.Domain + ": " + ex.Message);
continue;
}
MimeKit.Cryptography.DkimSigner signer;
try
{
AsymmetricKeyParameter key = KeyHelper.ParsePrivateKey(privateKey);
signer = new MimeKit.Cryptography.DkimSigner(key, domainElement.Domain,
domainElement.Selector)
{
SignatureAlgorithm = signatureAlgorithm
};
}
catch (Exception ex)
{
Logger.LogError("Could not initialize MimeKit DkimSigner for domain " + domainElement.Domain + ": " + ex.Message);
continue;
}
domains.Add(domainElement.Domain, new DomainElementSigner(domainElement, signer));
}
headerCanonicalization = config.HeaderCanonicalization == DkimCanonicalizationKind.Relaxed ? DkimCanonicalizationAlgorithm.Relaxed : DkimCanonicalizationAlgorithm.Simple;
bodyCanonicalization = config.BodyCanonicalization == DkimCanonicalizationKind.Relaxed ? DkimCanonicalizationAlgorithm.Relaxed : DkimCanonicalizationAlgorithm.Simple;
List<HeaderId> headerList = new List<HeaderId>();
foreach (string headerToSign in config.HeadersToSign)
{
HeaderId headerId;
#if EX_2007_SP3 || EX_2010 || EX_2010_SP1 || EX_2010_SP2 || EX_2010_SP3
if (!TryParseHeader(headerToSign, out headerId))
#else
if (!Enum.TryParse(headerToSign, true, out headerId))
#endif
{
Logger.LogWarning("Invalid value for header to sign: '" + headerToSign + "'. This header will be ignored.");
}
headerList.Add(headerId);
}
// The From header must always be signed according to the
// DKIM specification.
if (!headerList.Contains(HeaderId.From))
{
headerList.Add(HeaderId.From);
}
eligibleHeaders = headerList.ToArray();
}
}
/// <summary>
/// Load the current configuration for Exchange DkimSigner from the registry
/// </summary>
private void LoadDkimSignerConfig()
{
oConfig = new Settings();
oConfig.InitHeadersToSign();
if (!oConfig.Load(Path.Combine(Constants.DkimSignerPath, "settings.xml")))
{
ShowMessageBox("Settings error", "Couldn't load the settings file.\n Setting it to default values.", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
//
// Log level
//
switch (oConfig.Loglevel)
{
case 1:
cbLogLevel.Text = "Error";
break;
case 2:
cbLogLevel.Text = "Warning";
break;
case 3:
cbLogLevel.Text = "Information";
break;
case 4:
cbLogLevel.Text = "Debug";
break;
default:
cbLogLevel.Text = "Information";
ShowMessageBox("Information", "The log level is invalid. Set to default: Information.", MessageBoxButtons.OK, MessageBoxIcon.Information);
break;
}
//
// Algorithm and Canonicalization
//
rbRsaSha1.Checked = (oConfig.SigningAlgorithm == DkimAlgorithmKind.RsaSha1);
rbRsaSha256.Checked = (oConfig.SigningAlgorithm == DkimAlgorithmKind.RsaSha256);
rbSimpleHeaderCanonicalization.Checked = (oConfig.HeaderCanonicalization == DkimCanonicalizationKind.Simple);
rbRelaxedHeaderCanonicalization.Checked = (oConfig.HeaderCanonicalization == DkimCanonicalizationKind.Relaxed);
rbSimpleBodyCanonicalization.Checked = (oConfig.BodyCanonicalization == DkimCanonicalizationKind.Simple);
rbRelaxedBodyCanonicalization.Checked = (oConfig.BodyCanonicalization == DkimCanonicalizationKind.Relaxed);
//
// Headers to sign
//
lbxHeadersToSign.Items.Clear();
foreach (string sItem in oConfig.HeadersToSign)
{
lbxHeadersToSign.Items.Add(sItem);
}
//
// Domain
//
DomainElement oCurrentDomain = null;
if (lbxDomains.SelectedItem != null)
{
oCurrentDomain = (DomainElement)lbxDomains.SelectedItem;
}
lbxDomains.Items.Clear();
foreach (DomainElement oConfigDomain in oConfig.Domains)
{
lbxDomains.Items.Add(oConfigDomain);
}
if (oCurrentDomain != null)
{
lbxDomains.SelectedItem = oCurrentDomain;
}
bDataUpdated = false;
}
public void TestInitHeadersToSign()
{
Settings config = new Settings();
config.InitHeadersToSign();
Assert.AreEqual(new[] { "From", "Subject", "To", "Date", "Message-ID" }, config.HeadersToSign);
}