public static void DkimSign(MimeMessage message)
{
var headers = new HeaderId[] { HeaderId.From, HeaderId.Subject, HeaderId.Date };
var signer = new DkimSigner("privatekey.pem", "example.com", "brisbane", DkimSignatureAlgorithm.RsaSha256)
{
HeaderCanonicalizationAlgorithm = DkimCanonicalizationAlgorithm.Simple,
BodyCanonicalizationAlgorithm = DkimCanonicalizationAlgorithm.Simple,
AgentOrUserIdentifier = "@eng.example.com",
QueryMethod = "dns/txt",
};
// Prepare the message body to be sent over a 7bit transport (such as older versions of SMTP).
// Note: If the SMTP server you will be sending the message over supports the 8BITMIME extension,
// then you can use `EncodingConstraint.EightBit` instead.
message.Prepare(EncodingConstraint.SevenBit);
signer.Sign(message, headers);
}
public void TestSignRfc8463Example()
{
var message = MimeMessage.Load(Path.Combine(TestHelper.ProjectDir, "TestData", "dkim", "rfc8463-example.msg"));
var signer = new DkimSigner(Ed25519PrivateKey, "football.example.com", "brisbane", DkimSignatureAlgorithm.Ed25519Sha256)
{
HeaderCanonicalizationAlgorithm = DkimCanonicalizationAlgorithm.Relaxed,
BodyCanonicalizationAlgorithm = DkimCanonicalizationAlgorithm.Relaxed,
AgentOrUserIdentifier = "@football.example.com"
};
var headers = new string[] { "from", "to", "subject", "date", "message-id", "from", "subject", "date" };
signer.Sign(message, headers);
int index = message.Headers.IndexOf(HeaderId.DkimSignature);
var locator = new DkimPublicKeyLocator();
var verifier = new DkimVerifier(locator);
var dkim = message.Headers[index];
locator.Add("brisbane._domainkey.football.example.com", "v=DKIM1; k=ed25519; p=11qYAYKxCrfVS/7TyWQHOg7hcvPapiMlrwIaaPcHURo=");
locator.Add("test._domainkey.football.example.com", "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDkHlOQoBTzWRiGs5V6NpP3idY6Wk08a5qhdR6wy5bdOKb2jLQiY/J16JYi0Qvx/byYzCNb3W91y3FutACDfzwQ/BC/e/8uBsCR+yz1Lxj+PL6lHvqMKrM3rG4hstT5QjvHO9PzoxZyVYLzBfO2EeC3Ip3G+2kryOTIKT+l/K4w3QIDAQAB");
Assert.IsTrue(verifier.Verify(message, message.Headers[index]), "Failed to verify ed25519-sha256");
}
public static void SendEmail(string smtpHost, Int32 smtpPort, string from, SecureString password, string to, string subject, string bodyEmail, bool isDkimEmail, string txtDKIMPath)
{
SmtpClient smtpClient = new SmtpClient(); //inicjalizacja klienta smtp z przestrzeni nazw MailKit.Net.Smtp
try
{
smtpClient.Connect(smtpHost, smtpPort, SecureSocketOptions.StartTls); //łączymy się
}
catch (SmtpCommandException ex) //obsługa wyjątku
{
Console.WriteLine("~~Cannot connect with client (SMTP Command Exception): {0}~~", ex.ToString());
Environment.Exit(1);
}
catch (SmtpProtocolException ex) //obsługa wyjątku
{
Console.WriteLine("~~Cannot connect with client (SMTP Protocol Exception): {0}~~", ex.ToString());
Environment.Exit(1);
}
try
{
smtpClient.Authenticate(from, new NetworkCredential(string.Empty, password).Password);
}
catch (AuthenticationException ex) //obsługa wyjątku
{
Console.WriteLine("~~Authentication error (Authentication Exception): {0}~~", ex.ToString());
Environment.Exit(1);
}
catch (SmtpCommandException ex) //obsługa wyjątku
{
Console.WriteLine("~~Authentication error (SMTP Command Exception): {0}~~", ex.ToString());
Environment.Exit(1);
}
catch (SmtpProtocolException ex) //obsługa wyjątku
{
Console.WriteLine("~~Authentication error (SMTP Protocol Exception): {0}~~", ex.ToString());
Environment.Exit(1);
}
smtpClient.SslProtocols = System.Security.Authentication.SslProtocols.Tls12;
MimeMessage mimeMessage = new MimeMessage(); //inicjalizujemy obiekt mailMessage
if (isDkimEmail)
{
string domain = from.Split("@")[1];
HeaderId[] headers = new HeaderId[] { HeaderId.From, HeaderId.Subject, HeaderId.Date };
DkimSigner signer = new DkimSigner(txtDKIMPath, domain, "mail", DkimSignatureAlgorithm.RsaSha256)
{
HeaderCanonicalizationAlgorithm = DkimCanonicalizationAlgorithm.Relaxed,
BodyCanonicalizationAlgorithm = DkimCanonicalizationAlgorithm.Relaxed,
AgentOrUserIdentifier = "@" + domain,
QueryMethod = "dns/txt",
};
//message.Prepare(EncodingConstraint.SevenBit);
//message.Prepare(EncodingConstraint.EightBit);
signer.Sign(mimeMessage, headers);
}
mimeMessage.From.Add(new MailboxAddress(from)); //od kogo e-mail
mimeMessage.To.Add(new MailboxAddress(from)); //do kogo
mimeMessage.Subject = subject; //temat
BodyBuilder bodyBuilder = new BodyBuilder(); //bodyBuilder do tworzenia treści e-maila
bodyBuilder.TextBody = bodyEmail; //tekst treści
mimeMessage.Body = bodyBuilder.ToMessageBody(); //wrzucenie tekstu bodyBuildera do treści e-maila
try
{
smtpClient.Send(mimeMessage); //wysyłanie e-maila
}
catch (SmtpCommandException ex) //obsługa wyjątku
{
Console.WriteLine("~~E-mail has not been sent (SMTP Command Exception): {0}", ex.Message);
Environment.Exit(1);
}
catch (SmtpProtocolException ex) //obsługa wyjątku
{
Console.WriteLine("~~E-mail has not been sent (SMTP Protocol Exception): {0}", ex.Message);
Environment.Exit(1);
}
Console.WriteLine("~~E-mail sent~~");
smtpClient.Disconnect(true);
}
public void TestArgumentExceptions()
{
var locator = new DummyPublicKeyLocator(DkimKeys.Public);
var verifier = new DkimVerifier(locator);
var dkimHeader = new Header(HeaderId.DkimSignature, "value");
var arcHeader = new Header(HeaderId.ArcMessageSignature, "value");
var options = FormatOptions.Default;
var message = new MimeMessage();
DkimSigner signer;
Assert.Throws <ArgumentNullException> (() => new DkimSigner((AsymmetricKeyParameter)null, "domain", "selector"));
Assert.Throws <ArgumentException> (() => new DkimSigner(DkimKeys.Public, "domain", "selector"));
Assert.Throws <ArgumentNullException> (() => new DkimSigner(DkimKeys.Private, null, "selector"));
Assert.Throws <ArgumentNullException> (() => new DkimSigner(DkimKeys.Private, "domain", null));
Assert.Throws <ArgumentNullException> (() => new DkimSigner((string)null, "domain", "selector"));
Assert.Throws <ArgumentNullException> (() => new DkimSigner("fileName", null, "selector"));
Assert.Throws <ArgumentNullException> (() => new DkimSigner("fileName", "domain", null));
Assert.Throws <ArgumentException> (() => new DkimSigner(string.Empty, "domain", "selector"));
Assert.Throws <ArgumentNullException> (() => new DkimSigner((Stream)null, "domain", "selector"));
using (var stream = File.OpenRead(Path.Combine(TestHelper.ProjectDir, "TestData", "dkim", "example.pem"))) {
Assert.Throws <ArgumentNullException> (() => new DkimSigner(stream, null, "selector"));
Assert.Throws <ArgumentNullException> (() => new DkimSigner(stream, "domain", null));
signer = new DkimSigner(stream, "example.com", "1433868189.example")
{
SignatureAlgorithm = DkimSignatureAlgorithm.RsaSha1,
AgentOrUserIdentifier = "@eng.example.com",
QueryMethod = "dns/txt",
};
}
Assert.Throws <ArgumentNullException> (() => signer.Sign(null, new HeaderId[] { HeaderId.From }));
Assert.Throws <ArgumentNullException> (() => signer.Sign(message, (IList <HeaderId>)null));
Assert.Throws <ArgumentException> (() => signer.Sign(message, new HeaderId[] { HeaderId.Unknown, HeaderId.From }));
Assert.Throws <ArgumentException> (() => signer.Sign(message, new HeaderId[] { HeaderId.Received, HeaderId.From }));
Assert.Throws <ArgumentException> (() => signer.Sign(message, new HeaderId[] { HeaderId.ContentType }));
Assert.Throws <ArgumentNullException> (() => signer.Sign(null, new string[] { "From" }));
Assert.Throws <ArgumentNullException> (() => signer.Sign(message, (IList <string>)null));
Assert.Throws <ArgumentException> (() => signer.Sign(message, new string[] { "", "From" }));
Assert.Throws <ArgumentException> (() => signer.Sign(message, new string[] { null, "From" }));
Assert.Throws <ArgumentException> (() => signer.Sign(message, new string[] { "Received", "From" }));
Assert.Throws <ArgumentException> (() => signer.Sign(message, new string[] { "Content-Type" }));
Assert.Throws <ArgumentNullException> (() => signer.Sign(null, message, new HeaderId[] { HeaderId.From }));
Assert.Throws <ArgumentNullException> (() => signer.Sign(options, null, new HeaderId[] { HeaderId.From }));
Assert.Throws <ArgumentException> (() => signer.Sign(options, message, new HeaderId[] { HeaderId.From, HeaderId.Unknown }));
Assert.Throws <ArgumentNullException> (() => signer.Sign(options, message, (IList <HeaderId>)null));
Assert.Throws <ArgumentNullException> (() => signer.Sign(null, message, new string[] { "From" }));
Assert.Throws <ArgumentNullException> (() => signer.Sign(options, null, new string[] { "From" }));
Assert.Throws <ArgumentException> (() => signer.Sign(options, message, new string[] { "From", null }));
Assert.Throws <ArgumentNullException> (() => signer.Sign(options, message, (IList <string>)null));
Assert.Throws <ArgumentNullException> (() => new DkimVerifier(null));
Assert.Throws <ArgumentNullException> (() => verifier.Verify(null, dkimHeader));
Assert.Throws <ArgumentNullException> (() => verifier.Verify(message, null));
Assert.Throws <ArgumentNullException> (() => verifier.Verify(null, message, dkimHeader));
Assert.Throws <ArgumentNullException> (() => verifier.Verify(FormatOptions.Default, null, dkimHeader));
Assert.Throws <ArgumentNullException> (() => verifier.Verify(FormatOptions.Default, message, null));
Assert.Throws <ArgumentException> (() => verifier.Verify(FormatOptions.Default, message, arcHeader));
Assert.ThrowsAsync <ArgumentNullException> (async() => await verifier.VerifyAsync(null, dkimHeader));
Assert.ThrowsAsync <ArgumentNullException> (async() => await verifier.VerifyAsync(message, null));
Assert.ThrowsAsync <ArgumentNullException> (async() => await verifier.VerifyAsync(null, message, dkimHeader));
Assert.ThrowsAsync <ArgumentNullException> (async() => await verifier.VerifyAsync(FormatOptions.Default, null, dkimHeader));
Assert.ThrowsAsync <ArgumentNullException> (async() => await verifier.VerifyAsync(FormatOptions.Default, message, null));
Assert.ThrowsAsync <ArgumentException> (async() => await verifier.VerifyAsync(FormatOptions.Default, message, arcHeader));
Assert.Throws <ArgumentNullException> (() => message.Sign(null, new HeaderId[] { HeaderId.From }));
Assert.Throws <ArgumentNullException> (() => message.Sign(signer, (IList <HeaderId>)null));
Assert.Throws <ArgumentException> (() => message.Sign(signer, new HeaderId[] { HeaderId.Unknown, HeaderId.From }));
Assert.Throws <ArgumentException> (() => message.Sign(signer, new HeaderId[] { HeaderId.Received, HeaderId.From }));
Assert.Throws <ArgumentException> (() => message.Sign(signer, new HeaderId[] { HeaderId.ContentType }));
Assert.Throws <ArgumentNullException> (() => message.Sign(null, new string[] { "From" }));
Assert.Throws <ArgumentNullException> (() => message.Sign(signer, (IList <string>)null));
Assert.Throws <ArgumentException> (() => message.Sign(signer, new string[] { "", "From" }));
Assert.Throws <ArgumentException> (() => message.Sign(signer, new string[] { null, "From" }));
Assert.Throws <ArgumentException> (() => message.Sign(signer, new string[] { "Received", "From" }));
Assert.Throws <ArgumentException> (() => message.Sign(signer, new string[] { "Content-Type" }));
Assert.Throws <ArgumentNullException> (() => message.Sign(null, signer, new HeaderId[] { HeaderId.From }));
Assert.Throws <ArgumentNullException> (() => message.Sign(options, null, new HeaderId[] { HeaderId.From }));
Assert.Throws <ArgumentException> (() => message.Sign(options, signer, new HeaderId[] { HeaderId.From, HeaderId.Unknown }));
Assert.Throws <ArgumentNullException> (() => message.Sign(options, signer, (IList <HeaderId>)null));
Assert.Throws <ArgumentNullException> (() => message.Sign(null, signer, new string[] { "From" }));
Assert.Throws <ArgumentNullException> (() => message.Sign(options, null, new string[] { "From" }));
Assert.Throws <ArgumentException> (() => message.Sign(options, signer, new string[] { "From", null }));
Assert.Throws <ArgumentNullException> (() => message.Sign(options, signer, (IList <string>)null));
Assert.Throws <ArgumentNullException> (() => message.Verify(null, locator));
Assert.Throws <ArgumentNullException> (() => message.Verify(dkimHeader, null));
Assert.Throws <ArgumentNullException> (() => message.Verify(null, dkimHeader, locator));
Assert.Throws <ArgumentNullException> (() => message.Verify(FormatOptions.Default, null, locator));
Assert.Throws <ArgumentNullException> (() => message.Verify(FormatOptions.Default, dkimHeader, null));
Assert.Throws <ArgumentException> (() => message.Verify(FormatOptions.Default, arcHeader, locator));
Assert.ThrowsAsync <ArgumentNullException> (async() => await message.VerifyAsync(null, locator));
Assert.ThrowsAsync <ArgumentNullException> (async() => await message.VerifyAsync(dkimHeader, null));
Assert.ThrowsAsync <ArgumentNullException> (async() => await message.VerifyAsync(null, dkimHeader, locator));
Assert.ThrowsAsync <ArgumentNullException> (async() => await message.VerifyAsync(FormatOptions.Default, null, locator));
Assert.ThrowsAsync <ArgumentNullException> (async() => await message.VerifyAsync(FormatOptions.Default, dkimHeader, null));
Assert.ThrowsAsync <ArgumentException> (async() => await message.VerifyAsync(FormatOptions.Default, arcHeader, locator));
}
/// <summary>
/// Create a MimMessage so MailKit can send it
/// </summary>
/// <returns>The mail message.</returns>
/// <param name="email">Email data.</param>
private MimeMessage CreateMailMessage(IFluentEmail email)
{
var data = email.Data;
var message = new MimeMessage();
// fixes https://github.com/lukencode/FluentEmail/issues/228
// if for any reason, subject header is not added, add it else update it.
if (!message.Headers.Contains(HeaderId.Subject))
{
message.Headers.Add(HeaderId.Subject, Encoding.UTF8, data.Subject ?? string.Empty);
}
else
{
message.Headers[HeaderId.Subject] = data.Subject ?? string.Empty;
}
message.Headers.Add(HeaderId.Encoding, Encoding.UTF8.EncodingName);
message.From.Add(new MailboxAddress(data.FromAddress.Name, data.FromAddress.EmailAddress));
var builder = new BodyBuilder();
if (!string.IsNullOrEmpty(data.PlaintextAlternativeBody))
{
builder.TextBody = data.PlaintextAlternativeBody;
builder.HtmlBody = data.Body;
}
else if (!data.IsHtml)
{
builder.TextBody = data.Body;
}
else
{
builder.HtmlBody = data.Body;
}
data.Attachments.ForEach(x =>
{
MimeEntity attachment;
if (x.Data != null)
{
attachment = builder.Attachments.Add(x.Filename, x.Data, ContentType.Parse(x.ContentType));
}
else
{
attachment = builder.Attachments.Add(x.Filename, x.DataBuffer, ContentType.Parse(x.ContentType));
}
attachment.ContentId = x.ContentId;
});
message.Body = builder.ToMessageBody();
foreach (var header in data.Headers)
{
message.Headers.Add(header.Key, header.Value);
}
data.ToAddresses.ForEach(x =>
{
message.To.Add(new MailboxAddress(x.Name, x.EmailAddress));
});
data.CcAddresses.ForEach(x =>
{
message.Cc.Add(new MailboxAddress(x.Name, x.EmailAddress));
});
data.BccAddresses.ForEach(x =>
{
message.Bcc.Add(new MailboxAddress(x.Name, x.EmailAddress));
});
data.ReplyToAddresses.ForEach(x =>
{
message.ReplyTo.Add(new MailboxAddress(x.Name, x.EmailAddress));
});
switch (data.Priority)
{
case Priority.Low:
message.Priority = MessagePriority.NonUrgent;
break;
case Priority.Normal:
message.Priority = MessagePriority.Normal;
break;
case Priority.High:
message.Priority = MessagePriority.Urgent;
break;
}
if (_smtpClientOptions.Dkim != null && _smtpClientOptions.Dkim.Sign)
{
HeaderId[] headersToSign = new HeaderId[] { HeaderId.From, HeaderId.Subject, HeaderId.Date };
DkimSigner signer = new DkimSigner(_smtpClientOptions.Dkim.Key, _smtpClientOptions.Dkim.Domain, _smtpClientOptions.Dkim.Selector)
{
SignatureAlgorithm = DkimSignatureAlgorithm.RsaSha256,
HeaderCanonicalizationAlgorithm = DkimCanonicalizationAlgorithm.Relaxed,
BodyCanonicalizationAlgorithm = DkimCanonicalizationAlgorithm.Relaxed,
AgentOrUserIdentifier = $"@{_smtpClientOptions.Dkim.Domain}",
QueryMethod = "dns/txt",
};
message.Prepare(EncodingConstraint.EightBit);
signer.Sign(message, headersToSign);
}
return(message);
}