Is there any built in functionality to MIME a file in C# .Net? What I am looking to do is:
Convert a file into a MIME message
Sign the MIME Message to a pcks 7 blob
MIME that pkcs 7 blob
Finally encrypt the entire thing.
Any suggestions on how I would go about this (not the encryption or signing part but the MIMEing)? What exactly is envolved in MIMEing a file?
There is a good commercial package for a small fee:
Mime4Net
Rather than deal with third party libraries, I suggest you look to the core .NET library. Use the Attachment class; it's been around since .NET 2.
As far as I know there is no such support in the bare .NET. You have to try one of third party libraries. One of them is our Rebex Secure Mail for .NET. Following code shows how to achieve it:
using Rebex.Mail;
using Rebex.Mime.Headers;
using Rebex.Security.Certificates;
...
// load the sender's certificate and
// associated private key from a file
Certificate signer = Certificate.LoadPfx("hugo.pfx", "password");
// load the recipient's certificate
Certificate recipient = Certificate.LoadDer("joe.cer");
// create an instance of MailMessage
MailMessage message = new MailMessage();
// set its properties to desired values
message.From = "hugo#example.com";
message.To = "joe#example.com";
message.Subject = "This is a simple message";
message.BodyText = "Hello, Joe!";
message.BodyHtml = "Hello, <b>Joe</b>!";
// sign the message using Hugo's certificate
message.Sign(signer);
// and encrypt it using Joe's certificate
message.Encrypt(recipient);
// if you wanted Hugo to be able to read the message later as well,
// you can encrypt it for Hugo as well instead - comment out the previous
// encrypt and uncomment this one:
// message.Encrypt(recipient, signer)
(Code taken from the S/MIME tutorial page)
Something that hasn't been mentioned is MimeKit.
It does everything that you need it to do.
(this is still a top hit in google so thought I'd add this gem)
Related
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I am looking for a method of reading emails using Pop3 in C# 2.0. Currently, I am using code found in CodeProject. However, this solution is less than ideal. The biggest problem is that it doesn't support emails written in unicode.
I've successfully used OpenPop.NET to access emails via POP3.
downloading the email via the POP3 protocol is the easy part of the task. The protocol is quite simple and the only hard part could be advanced authentication methods if you don't want to send a clear text password over the network (and cannot use the SSL encrypted communication channel). See RFC 1939: Post Office Protocol - Version 3
and RFC 1734: POP3 AUTHentication command for details.
The hard part comes when you have to parse the received email, which means parsing MIME format in most cases. You can write quick&dirty MIME parser in a few hours or days and it will handle 95+% of all incoming messages. Improving the parser so it can parse almost any email means:
getting email samples sent from the most popular mail clients and improve the parser in order to fix errors and RFC misinterpretations generated by them.
Making sure that messages violating RFC for message headers and content will not crash your parser and that you will be able to read every readable or guessable value from the mangled email
correct handling of internationalization issues (e.g. languages written from righ to left, correct encoding for specific language etc)
UNICODE
Attachments and hierarchical message item tree as seen in "Mime torture email sample"
S/MIME (signed and encrypted emails).
and so on
Debugging a robust MIME parser takes months of work. I know, because I was watching my friend writing one such parser for the component mentioned below and was writing a few unit tests for it too ;-)
Back to the original question.
Following code taken from our POP3 Tutorial page and links would help you:
//
// create client, connect and log in
Pop3 client = new Pop3();
client.Connect("pop3.example.org");
client.Login("username", "password");
// get message list
Pop3MessageCollection list = client.GetMessageList();
if (list.Count == 0)
{
Console.WriteLine("There are no messages in the mailbox.");
}
else
{
// download the first message
MailMessage message = client.GetMailMessage(list[0].SequenceNumber);
...
}
client.Disconnect();
HOWTO: Download emails from a GMail account in C# (blogpost)
Rebex Mail for .NET (POP3/IMAP client component for .NET)
Rebex Secure Mail for .NET (POP3/IMAP client component for .NET - SSL enabled)
My open source application BugTracker.NET includes a POP3 client that can parse MIME. Both the POP3 code and the MIME code are from other authors, but you can see how it all fits together in my app.
For the MIME parsing, I use http://anmar.eu.org/projects/sharpmimetools/.
See the file POP3Main.cs, POP3Client.cs, and insert_bug.aspx
You can also try Mail.dll mail component, it has SSL support, unicode, and multi-national email support:
using(Pop3 pop3 = new Pop3())
{
pop3.Connect("mail.host.com"); // Connect to server and login
pop3.Login("user", "password");
foreach(string uid in pop3.GetAll())
{
IMail email = new MailBuilder()
.CreateFromEml(pop3.GetMessageByUID(uid));
Console.WriteLine( email.Subject );
}
pop3.Close(false);
}
You can download it here at https://www.limilabs.com/mail
Please note that this is a commercial product I've created.
call me old fashion but why use a 3rd party library for a simple protocol. I've implemented POP3 readers in web based ASP.NET application with System.Net.Sockets.TCPClient and System.Net.Security.SslStream for the encryption and authentication. As far as protocols go, once you open up communication with the POP3 server, there are only a handful of commands that you have to deal with. It is a very easy protocol to work with.
I wouldn't recommend OpenPOP. I just spent a few hours debugging an issue - OpenPOP's POPClient.GetMessage() was mysteriously returning null. I debugged this and found it was a string index bug - see the patch I submitted here: http://sourceforge.net/tracker/?func=detail&aid=2833334&group_id=92166&atid=599778. It was difficult to find the cause since there are empty catch{} blocks that swallow exceptions.
Also, the project is mostly dormant... the last release was in 2004.
For now we're still using OpenPOP, but I'll take a look at some of the other projects people have recommended here.
HigLabo.Mail is easy to use. Here is a sample usage:
using (Pop3Client cl = new Pop3Client())
{
cl.UserName = "MyUserName";
cl.Password = "MyPassword";
cl.ServerName = "MyServer";
cl.AuthenticateMode = Pop3AuthenticateMode.Pop;
cl.Ssl = false;
cl.Authenticate();
///Get first mail of my mailbox
Pop3Message mg = cl.GetMessage(1);
String MyText = mg.BodyText;
///If the message have one attachment
Pop3Content ct = mg.Contents[0];
///you can save it to local disk
ct.DecodeData("your file path");
}
you can get it from https://github.com/higty/higlabo or Nuget [HigLabo]
I just tried SMTPop and it worked.
I downloaded this.
Added smtpop.dll reference to my C# .NET project
Wrote the following code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using SmtPop;
namespace SMT_POP3 {
class Program {
static void Main(string[] args) {
SmtPop.POP3Client pop = new SmtPop.POP3Client();
pop.Open("<hostURL>", 110, "<username>", "<password>");
// Get message list from POP server
SmtPop.POPMessageId[] messages = pop.GetMailList();
if (messages != null) {
// Walk attachment list
foreach(SmtPop.POPMessageId id in messages) {
SmtPop.POPReader reader= pop.GetMailReader(id);
SmtPop.MimeMessage msg = new SmtPop.MimeMessage();
// Read message
msg.Read(reader);
if (msg.AddressFrom != null) {
String from= msg.AddressFrom[0].Name;
Console.WriteLine("from: " + from);
}
if (msg.Subject != null) {
String subject = msg.Subject;
Console.WriteLine("subject: "+ subject);
}
if (msg.Body != null) {
String body = msg.Body;
Console.WriteLine("body: " + body);
}
if (msg.Attachments != null && false) {
// Do something with first attachment
SmtPop.MimeAttachment attach = msg.Attachments[0];
if (attach.Filename == "data") {
// Read data from attachment
Byte[] b = Convert.FromBase64String(attach.Body);
System.IO.MemoryStream mem = new System.IO.MemoryStream(b, false);
//BinaryFormatter f = new BinaryFormatter();
// DataClass data= (DataClass)f.Deserialize(mem);
mem.Close();
}
// Delete message
// pop.Dele(id.Id);
}
}
}
pop.Quit();
}
}
}
I need help with converting EML to MSG, using the Exchange web service (EWS) in a Outlook Web Add-In. When i create an EML file from the MimeContent (EmailMessage.MimeContent.Content), the file output looks bad, some tags are not convert currently.
The files open good just from Windows mail app, but from Ooutlook(2016) looks bad.
I tried to find some solution from Microsoft and found this Independentsoft, a third party solution, and it is work great. the file looks good while the format is MSG. but it is to expansive licence solution for the customer (used 30 days demo).
This is what i used and work well, and try to found something like this:
//1.This code use the EWS mimeContent(the message on bytes - eml format)
//2.Create Independentsoft message object
//Independentsoft.Msg.Message constractor do the convert by
// making an msg object from an eml object.
//3. save the msg file.
Independentsoft.Email.Mime.Message mimeMessage = new Independentsoft.Email.Mime.Message(emailMessage.MimeContent.Content);
Independentsoft.Msg.Message msgMessage = Independentsoft.Msg.Message(mimeMessage);
using (MemoryStream memStream = new MemoryStream(emailMessage.MimeContent.Content.Length))
{
Directory.CreateDirectory(TempMsgDirectory);
msgMessage.Save(TempMsgDirectory + "mail.msg", true);
}
I am not aware of any Outlook problems with displaying EML files. It uses the same EML parser used to parse incoming POP3/IMAP4 messages. Please post a specific EML file that Outlook does not display correctly.
As for converting EML files to MSG, you can also use Redemption (I am its author) and its RDOSession.CreateMessageFromMsgFIle and RDOMail.Import methods. Just keep in mind that it requires the MAPI system to be present to function properly, which means Outlook must be installed locally.
Off the top of my head:
RDOSession session = new RDOSession();
RDOMail msg = session.CreateMessageFromMsgFile(TempMsgDirectory + "mail.msg");
msg.Import(TempMsgDirectory + "YouEmlFile.eml", rdoSaveAsType.olRFC822);
msg.Save();
Also keep in mind that retrieving MIME content from Exchange might not be the best idea - you will lose all MAPI specific properties and will end up with a corrupted message if the original was in the RTF format (with or without embedded OLE objects). In that case, you can use ExportItems EWS operation. Its format is not documented, but it is very close to the MSG format, and you can convert it to MSG using code similar to that above, but specifying olFTS format instead of olRFC822.
We are using MailKit in our application to send e-mails to users. These e-mails often have attachments with Unicode or long file names. Some e-mail clients, such as Outlook (when using POP or IMAP) or Outlook Express, cannot handle RFC 2231, and the result is that the attachments have names 'Untitled Attachment'.
Is there a way to send mails (using MailKit) supporting RFC 2047 (encoded-words) for attachments file names? A possible solution would be to keep RFC 2231 in filename in content-disposition, but use as a fall-back an encoded-word encoded name parameter in content-type. Is something like this supported?
I've just added support for using rfc2047 encoding to MimeKit.
There are now 2 ways of controlling the encoding method used for parameter values.
The first way is to set the encoding method on each individual Parameter:
param.EncodingMethod = ParameterEncodingMethod.Rfc2047;
The second way is to set the default parameter encoding method on the FormatOptions used for writing out the message and/or MIME part(s):
var options = FormatOptions.Default.Clone ();
options.ParameterEncodingMethod = ParameterEncodingMethod.Rfc2047;
message.WriteTo (options, stream);
I'll try to release a new MimeKit 1.3.0-beta3 to nuget soon with this feature.
Is there any way to create .pfx files in order to sign documents,
I've found a program called x509 Certificate Generate,but I want to know if it can be generated in code using c#.
There is a Microsoft command-line tool makecert that can be used to generate certificates. It's part of the Windows SDK. On my machine there are half a dozen versions e.g. in C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin\x64. Then in your code you can start a process to run the executable with the appropriate parameters.
You could check out the Bouncy Castle API, it can be used to generate certificates using C#.
First of all, signing documents with self-signed certificates makes no sense unless you have custom PKI hierarchy in your organization (and in the latter case you need to know well what you are doing, which seems to be not the case).
PFX is a container for one or more certificates with associated private keys. So you don't generate "PFX file". You generate a keypair and create a certificate, which can then be exported to PFX file or to other format.
As mentioned above, BouncyCastle can generate certificates, and our SecureBlackbox library also can generate certificates and save and load them to/from many different formats.
If you read about makecert like #David Clarke's answer refers to, you will see to fulfill your requirement, you just need a managed makecert written in .NET.
Luckily the Mono guys have implemented this a long time ago,
https://github.com/mono/mono/blob/master/mcs/tools/security/makecert.cs
You can make digital signature by using adobe reader
if you are using adobe x
-then go to 3rd option from left
-here you can see signing setting
-open this and go to add id
-just enter your details and your are done .pfx file is ready where ever you browsed it....
-it is valid for 6 years
You can use OpenSSL.NET library for this.
Here is the code example how to do it:
public X509Certificate2 GeneratePfxCertificate(string certificatePath, string privateKeyPath,
string certificatePfxPath, string rootCertificatePath, string pkcs12Password)
{
string keyFileContent = File.ReadAllText(privateKeyPath);
string certFileContent = File.ReadAllText(certificatePath);
string rootCertFileContent = File.ReadAllText(rootCertificatePath);
var certBio = new BIO(certFileContent);
var rootCertBio = new BIO(rootCertFileContent);
CryptoKey cryptoKey = CryptoKey.FromPrivateKey(keyFileContent, string.Empty);
var certificate = new OpenSSL.X509.X509Certificate(certBio);
var rootCertificate = new OpenSSL.X509.X509Certificate(rootCertBio);
using (var certChain = new Stack<OpenSSL.X509.X509Certificate> { rootCertificate })
using (var p12 = new PKCS12(pkcs12Password, cryptoKey, certificate, certChain))
using (var pfxBio = BIO.MemoryBuffer())
{
p12.Write(pfxBio);
var pfxFileByteArrayContent =
pfxBio.ReadBytes((int)pfxBio.BytesPending).Array;
File.WriteAllBytes(certificatePfxPath, pfxFileByteArrayContent);
}
return new X509Certificate2(certificatePfxPath, pkcs12Password);
}
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Questions asking us to recommend or find a tool, library or favorite off-site resource are off-topic for Stack Overflow as they tend to attract opinionated answers and spam. Instead, describe the problem and what has been done so far to solve it.
Closed 9 years ago.
Improve this question
I am looking for a method of reading emails using Pop3 in C# 2.0. Currently, I am using code found in CodeProject. However, this solution is less than ideal. The biggest problem is that it doesn't support emails written in unicode.
I've successfully used OpenPop.NET to access emails via POP3.
downloading the email via the POP3 protocol is the easy part of the task. The protocol is quite simple and the only hard part could be advanced authentication methods if you don't want to send a clear text password over the network (and cannot use the SSL encrypted communication channel). See RFC 1939: Post Office Protocol - Version 3
and RFC 1734: POP3 AUTHentication command for details.
The hard part comes when you have to parse the received email, which means parsing MIME format in most cases. You can write quick&dirty MIME parser in a few hours or days and it will handle 95+% of all incoming messages. Improving the parser so it can parse almost any email means:
getting email samples sent from the most popular mail clients and improve the parser in order to fix errors and RFC misinterpretations generated by them.
Making sure that messages violating RFC for message headers and content will not crash your parser and that you will be able to read every readable or guessable value from the mangled email
correct handling of internationalization issues (e.g. languages written from righ to left, correct encoding for specific language etc)
UNICODE
Attachments and hierarchical message item tree as seen in "Mime torture email sample"
S/MIME (signed and encrypted emails).
and so on
Debugging a robust MIME parser takes months of work. I know, because I was watching my friend writing one such parser for the component mentioned below and was writing a few unit tests for it too ;-)
Back to the original question.
Following code taken from our POP3 Tutorial page and links would help you:
//
// create client, connect and log in
Pop3 client = new Pop3();
client.Connect("pop3.example.org");
client.Login("username", "password");
// get message list
Pop3MessageCollection list = client.GetMessageList();
if (list.Count == 0)
{
Console.WriteLine("There are no messages in the mailbox.");
}
else
{
// download the first message
MailMessage message = client.GetMailMessage(list[0].SequenceNumber);
...
}
client.Disconnect();
HOWTO: Download emails from a GMail account in C# (blogpost)
Rebex Mail for .NET (POP3/IMAP client component for .NET)
Rebex Secure Mail for .NET (POP3/IMAP client component for .NET - SSL enabled)
My open source application BugTracker.NET includes a POP3 client that can parse MIME. Both the POP3 code and the MIME code are from other authors, but you can see how it all fits together in my app.
For the MIME parsing, I use http://anmar.eu.org/projects/sharpmimetools/.
See the file POP3Main.cs, POP3Client.cs, and insert_bug.aspx
You can also try Mail.dll mail component, it has SSL support, unicode, and multi-national email support:
using(Pop3 pop3 = new Pop3())
{
pop3.Connect("mail.host.com"); // Connect to server and login
pop3.Login("user", "password");
foreach(string uid in pop3.GetAll())
{
IMail email = new MailBuilder()
.CreateFromEml(pop3.GetMessageByUID(uid));
Console.WriteLine( email.Subject );
}
pop3.Close(false);
}
You can download it here at https://www.limilabs.com/mail
Please note that this is a commercial product I've created.
call me old fashion but why use a 3rd party library for a simple protocol. I've implemented POP3 readers in web based ASP.NET application with System.Net.Sockets.TCPClient and System.Net.Security.SslStream for the encryption and authentication. As far as protocols go, once you open up communication with the POP3 server, there are only a handful of commands that you have to deal with. It is a very easy protocol to work with.
I wouldn't recommend OpenPOP. I just spent a few hours debugging an issue - OpenPOP's POPClient.GetMessage() was mysteriously returning null. I debugged this and found it was a string index bug - see the patch I submitted here: http://sourceforge.net/tracker/?func=detail&aid=2833334&group_id=92166&atid=599778. It was difficult to find the cause since there are empty catch{} blocks that swallow exceptions.
Also, the project is mostly dormant... the last release was in 2004.
For now we're still using OpenPOP, but I'll take a look at some of the other projects people have recommended here.
HigLabo.Mail is easy to use. Here is a sample usage:
using (Pop3Client cl = new Pop3Client())
{
cl.UserName = "MyUserName";
cl.Password = "MyPassword";
cl.ServerName = "MyServer";
cl.AuthenticateMode = Pop3AuthenticateMode.Pop;
cl.Ssl = false;
cl.Authenticate();
///Get first mail of my mailbox
Pop3Message mg = cl.GetMessage(1);
String MyText = mg.BodyText;
///If the message have one attachment
Pop3Content ct = mg.Contents[0];
///you can save it to local disk
ct.DecodeData("your file path");
}
you can get it from https://github.com/higty/higlabo or Nuget [HigLabo]
I just tried SMTPop and it worked.
I downloaded this.
Added smtpop.dll reference to my C# .NET project
Wrote the following code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using SmtPop;
namespace SMT_POP3 {
class Program {
static void Main(string[] args) {
SmtPop.POP3Client pop = new SmtPop.POP3Client();
pop.Open("<hostURL>", 110, "<username>", "<password>");
// Get message list from POP server
SmtPop.POPMessageId[] messages = pop.GetMailList();
if (messages != null) {
// Walk attachment list
foreach(SmtPop.POPMessageId id in messages) {
SmtPop.POPReader reader= pop.GetMailReader(id);
SmtPop.MimeMessage msg = new SmtPop.MimeMessage();
// Read message
msg.Read(reader);
if (msg.AddressFrom != null) {
String from= msg.AddressFrom[0].Name;
Console.WriteLine("from: " + from);
}
if (msg.Subject != null) {
String subject = msg.Subject;
Console.WriteLine("subject: "+ subject);
}
if (msg.Body != null) {
String body = msg.Body;
Console.WriteLine("body: " + body);
}
if (msg.Attachments != null && false) {
// Do something with first attachment
SmtPop.MimeAttachment attach = msg.Attachments[0];
if (attach.Filename == "data") {
// Read data from attachment
Byte[] b = Convert.FromBase64String(attach.Body);
System.IO.MemoryStream mem = new System.IO.MemoryStream(b, false);
//BinaryFormatter f = new BinaryFormatter();
// DataClass data= (DataClass)f.Deserialize(mem);
mem.Close();
}
// Delete message
// pop.Dele(id.Id);
}
}
}
pop.Quit();
}
}
}