public static MailMessage DomainKeySign([NotNull] this MailMessage message, DomainKeySigner signer)
{
if (message == null)
{
throw new ArgumentNullException("message");
}
if (signer == null)
{
throw new ArgumentNullException("signer");
}
message.BodyEncoding = signer.Encoding;
message.SubjectEncoding = signer.Encoding;
message.HeadersEncoding = signer.Encoding;
var email = Email.Parse(message.GetText());
if (!CanSign(email))
{
throw new InvalidOperationException("Unable to Domain Key sign the message");
}
var sig = signer.GenerateSignature(email);
message.Headers.Prepend(DomainKeySigner.SignatureKey, sig);
return(message);
}
public void AddDkimHeader(System.Net.Mail.MailMessage message)
{
if (string.IsNullOrWhiteSpace(GlobalConfiguration.Configuration.DkimPrivateKey))
{
return;
}
if (message.From.Host != GlobalConfiguration.Configuration.DkimDomain)
{
return;
}
try
{
var privateKey = DKIM.PrivateKeySigner.Create(GlobalConfiguration.Configuration.DkimPrivateKey);
var headerToSign = new string[] { "From", "To", "Subject" };
var domainKeySigner = new DKIM.DomainKeySigner(privateKey,
GlobalConfiguration.Configuration.DkimDomain,
GlobalConfiguration.Configuration.DkimSelector,
headerToSign);
var dkimSigner = new DkimSigner(privateKey,
GlobalConfiguration.Configuration.DkimDomain,
GlobalConfiguration.Configuration.DkimSelector,
headerToSign);
message.DomainKeySign(domainKeySigner);
message.DkimSign(dkimSigner);
}
catch (Exception ex)
{
ex.Data.Add("domain", GlobalConfiguration.Configuration.DkimDomain);
ex.Data.Add("from", message.From.Address);
foreach (var emailTo in message.To)
{
ex.Data.Add(string.Format("to{0}", message.To.IndexOf(emailTo)), emailTo.Address);
}
ex.Data.Add("subject", message.Subject);
GlobalConfiguration.Configuration.Logger.Error(ex);
}
}
public FullEmailSigner(
[NotNull] IPrivateKeySigner privateKey,
[NotNull] Encoding encoding,
[NotNull] string domain,
[NotNull] string dkimSelector,
[NotNull] string domainKeySelector,
[NotNull] string[] headers)
{
if (privateKey == null)
{
throw new ArgumentNullException("privateKey");
}
if (encoding == null)
{
throw new ArgumentNullException("encoding");
}
if (domain == null)
{
throw new ArgumentNullException("domain");
}
if (dkimSelector == null)
{
throw new ArgumentNullException("dkimSelector");
}
if (domainKeySelector == null)
{
throw new ArgumentNullException("domainKeySelector");
}
if (headers == null)
{
throw new ArgumentNullException("headers");
}
var dkim = new DkimSigner(
privateKey,
domain,
dkimSelector,
headers
);
//var debugger = new ConsoleDebug();
//dkim.Debug = debugger;
dkim.Encoding = encoding;
dkim.BodyCanonicalization = DkimCanonicalizationAlgorithm.Simple;
_dkimSigner = dkim;
var domainKeySigner = new DomainKeySigner(
privateKey,
domain,
domainKeySelector,
headers
);
domainKeySigner.Encoding = encoding;
domainKeySigner.Canonicalization = DomainKeyCanonicalizationAlgorithm.Nofws;
_domainKeySigner = domainKeySigner;
}
public FullEmailSigner(
[NotNull] IPrivateKeySigner privateKey,
[NotNull] Encoding encoding,
[NotNull] string domain,
[NotNull] string dkimSelector,
[NotNull] string domainKeySelector,
[NotNull] string[] headers)
{
if (privateKey == null) throw new ArgumentNullException("privateKey");
if (encoding == null) throw new ArgumentNullException("encoding");
if (domain == null) throw new ArgumentNullException("domain");
if (dkimSelector == null) throw new ArgumentNullException("dkimSelector");
if (domainKeySelector == null) throw new ArgumentNullException("domainKeySelector");
if (headers == null) throw new ArgumentNullException("headers");
var dkim = new DkimSigner(
privateKey,
domain,
dkimSelector,
headers
);
//var debugger = new ConsoleDebug();
//dkim.Debug = debugger;
dkim.Encoding = encoding;
dkim.BodyCanonicalization = DkimCanonicalizationAlgorithm.Simple;
_dkimSigner = dkim;
var domainKeySigner = new DomainKeySigner(
privateKey,
domain,
domainKeySelector,
headers
);
domainKeySigner.Encoding = encoding;
domainKeySigner.Canonicalization = DomainKeyCanonicalizationAlgorithm.Nofws;
_domainKeySigner = domainKeySigner;
}
public static MailMessage DomainKeySign([NotNull]this MailMessage message, DomainKeySigner signer)
{
if (message == null)
{
throw new ArgumentNullException("message");
}
if (signer == null)
{
throw new ArgumentNullException("signer");
}
message.BodyEncoding = signer.Encoding;
message.SubjectEncoding = signer.Encoding;
message.HeadersEncoding = signer.Encoding;
var email = Email.Parse(message.GetText());
if(!CanSign(email))
{
throw new InvalidOperationException("Unable to Domain Key sign the message");
}
var sig = signer.GenerateSignature(email);
message.Headers.Prepend(DomainKeySigner.SignatureKey, sig);
return message;
}
private static void GetDkimSigners()
{
try
{
var files = new DirectoryInfo(Config.PrivateKeyFolder).GetFiles("*.pem");
if (files.Length == 0)
throw new Exception("No private key files (*.pem) found");
foreach (var file in files)
{
var key = file.Name.Replace(".pem", "");
var selector = key.Split('@')[0];
var domain = key.Split('@')[1];
var pKeySig = PrivateKeySigner.LoadFromFile(file.FullName);
var dkimSig = new DkimSigner(pKeySig, domain, selector, new[] { "From", "To", "Subject" });
var domainKeySig = new DomainKeySigner(pKeySig, domain, selector, new[] { "From", "To", "Subject" });
dkimSig.HeaderCanonicalization = DkimCanonicalizationAlgorithm.RELAXED;
dkimSig.BodyCanonicalization = DkimCanonicalizationAlgorithm.RELAXED;
_dkimSignerCache.TryAdd(key, dkimSig);
_domailKeySignerCache.TryAdd(key, domainKeySig);
}
}
catch (Exception ex)
{
Logger.Log.Warn("Unable to turn on DKIM: {0}", ex.Message);
}
}