package org.bouncycastle.mail.smime;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSSignedDataParser;
import org.bouncycastle.cms.CMSTypedStream;
import javax.activation.CommandMap;
import javax.activation.MailcapCommandMap;
import javax.mail.*;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import java.io.*;
import java.util.Enumeration;
/**
* general class for handling a pkcs7-signature message.
* <p>
* A simple example of usage - note, in the example below the validity of
* the certificate isn't verified, just the fact that one of the certs
* matches the given signer...
* <p>
* <pre>
* CertStore certs = s.getCertificates("Collection", "BC");
* SignerInformationStore signers = s.getSignerInfos();
* Collection c = signers.getSigners();
* Iterator it = c.iterator();
*
* while (it.hasNext())
* {
* SignerInformation signer = (SignerInformation)it.next();
* Collection certCollection = certs.getCertificates(signer.getSID());
*
* Iterator certIt = certCollection.iterator();
* X509Certificate cert = (X509Certificate)certIt.next();
*
* if (signer.verify(cert.getPublicKey()))
* {
* verified++;
* }
* }
* </pre>
* <p>
* Note: if you are using this class with AS2 or some other protocol
* that does not use 7bit as the default content transfer encoding you
* will need to use the constructor that allows you to specify the default
* content transfer encoding, such as "binary".
* </p>
*/
public class SMIMESignedParser
extends CMSSignedDataParser
{
Object message;
MimeBodyPart content;
private static InputStream getInputStream(
Part bodyPart)
throws MessagingException
{
try
{
if (bodyPart.isMimeType("multipart/signed"))
{
throw new MessagingException("attempt to create signed data object from multipart content - use MimeMultipart constructor.");
}
return bodyPart.getInputStream();
}
catch (IOException e)
{
throw new MessagingException("can't extract input stream: " + e);
}
}
private static File getTmpFile()
throws MessagingException
{
try
{
return File.createTempFile("bcMail", ".mime");
}
catch (IOException e)
{
throw new MessagingException("can't extract input stream: " + e);
}
}
private static CMSTypedStream getSignedInputStream(
BodyPart bodyPart,
String defaultContentTransferEncoding,
File backingFile)
throws MessagingException
{
try
{
OutputStream out = new BufferedOutputStream(new FileOutputStream(backingFile));
SMIMEUtil.outputBodyPart(out, bodyPart, defaultContentTransferEncoding);
out.close();
InputStream in = new TemporaryFileInputStream(backingFile);
return new CMSTypedStream(in);
}
catch (IOException e)
{
throw new MessagingException("can't extract input stream: " + e);
}
}
static
{
MailcapCommandMap mc = (MailcapCommandMap)CommandMap.getDefaultCommandMap();
mc.addMailcap("application/pkcs7-signature;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.pkcs7_signature");
mc.addMailcap("application/pkcs7-mime;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.pkcs7_mime");
mc.addMailcap("application/x-pkcs7-signature;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.x_pkcs7_signature");
mc.addMailcap("application/x-pkcs7-mime;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.x_pkcs7_mime");
mc.addMailcap("multipart/signed;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.multipart_signed");
CommandMap.setDefaultCommandMap(mc);
}
/**
* base constructor using a defaultContentTransferEncoding of 7bit. A temporary backing file
* will be created for the signed data.
*
* @param message signed message with signature.
* @exception MessagingException on an error extracting the signature or
* otherwise processing the message.
* @exception CMSException if some other problem occurs.
*/
public SMIMESignedParser(
MimeMultipart message)
throws MessagingException, CMSException
{
this(message, getTmpFile());
}
/**
* base constructor using a defaultContentTransferEncoding of 7bit and a specified backing file.
*
* @param message signed message with signature.
* @param backingFile the temporary file to use to back the signed data.
* @exception MessagingException on an error extracting the signature or
* otherwise processing the message.
* @exception CMSException if some other problem occurs.
*/
public SMIMESignedParser(
MimeMultipart message,
File backingFile)
throws MessagingException, CMSException
{
this(message, "7bit", backingFile);
}
/**
* base constructor with settable contentTransferEncoding. A temporary backing file will be created
* to contain the signed data.
*
* @param message the signed message with signature.
* @param defaultContentTransferEncoding new default to use.
* @exception MessagingException on an error extracting the signature or
* otherwise processing the message.
* @exception CMSException if some other problem occurs.
*/
public SMIMESignedParser(
MimeMultipart message,
String defaultContentTransferEncoding)
throws MessagingException, CMSException
{
this(message, defaultContentTransferEncoding, getTmpFile());
}
/**
* base constructor with settable contentTransferEncoding and a specified backing file.
*
* @param message the signed message with signature.
* @param defaultContentTransferEncoding new default to use.
* @param backingFile the temporary file to use to back the signed data.
* @exception MessagingException on an error extracting the signature or
* otherwise processing the message.
* @exception CMSException if some other problem occurs.
*/
public SMIMESignedParser(
MimeMultipart message,
String defaultContentTransferEncoding,
File backingFile)
throws MessagingException, CMSException
{
super(getSignedInputStream(message.getBodyPart(0), defaultContentTransferEncoding, backingFile), getInputStream(message.getBodyPart(1)));
this.message = message;
this.content = (MimeBodyPart)message.getBodyPart(0);
drainContent();
}
/**
* base constructor for a signed message with encapsulated content.
* <p>
* Note: in this case the encapsulated MimeBody part will only be suitable for a single
* writeTo - once writeTo has been called the file containing the body part will be deleted. If writeTo is not
* called the file will be left in the temp directory.
* </p>
* @param message the message containing the encapsulated signed data.
* @exception MessagingException on an error extracting the signature or
* otherwise processing the message.
* @exception SMIMEException if the body part encapsulated in the message cannot be extracted.
* @exception CMSException if some other problem occurs.
*/
public SMIMESignedParser(
Part message)
throws MessagingException, CMSException, SMIMEException
{
super(getInputStream(message));
this.message = message;
CMSTypedStream cont = this.getSignedContent();
if (cont != null)
{
this.content = SMIMEUtil.toWriteOnceBodyPart(cont);
}
}
/**
* Constructor for a signed message with encapsulated content. The encapsulated
* content, if it exists, is written to the file represented by the File object
* passed in.
*
* @param message the Part containing the signed content.
* @param file the file the encapsulated part is to be written to after it has been decoded.
*
* @exception MessagingException on an error extracting the signature or
* otherwise processing the message.
* @exception SMIMEException if the body part encapsulated in the message cannot be extracted.
* @exception CMSException if some other problem occurs.
*/
public SMIMESignedParser(
Part message,
File file)
throws MessagingException, CMSException, SMIMEException
{
super(getInputStream(message));
this.message = message;
CMSTypedStream cont = this.getSignedContent();
if (cont != null)
{
this.content = SMIMEUtil.toMimeBodyPart(cont, file);
}
}
/**
* return the content that was signed.
* @return the signed body part in this message.
*/
public MimeBodyPart getContent()
{
return content;
}
/**
* Return the content that was signed as a mime message.
*
* @param session the session to base the MimeMessage around.
* @return a MimeMessage holding the content.
* @throws MessagingException if there is an issue creating the MimeMessage.
* @throws IOException if there is an issue reading the content.
*/
public MimeMessage getContentAsMimeMessage(Session session)
throws MessagingException, IOException
{
if (message instanceof MimeMultipart)
{
BodyPart bp = ((MimeMultipart)message).getBodyPart(0);
return new MimeMessage(session, bp.getInputStream());
}
else
{
return new MimeMessage(session, getSignedContent().getContentStream());
}
}
/**
* return the content that was signed with its signature attached.
* @return depending on whether this was unencapsulated or not it will return a MimeMultipart
* or a MimeBodyPart
*/
public Object getContentWithSignature()
{
return message;
}
private void drainContent()
throws CMSException
{
try
{
this.getSignedContent().drain();
}
catch (IOException e)
{
throw new CMSException("unable to read content for verification: " + e, e);
}
}
private static class TemporaryFileInputStream
extends BufferedInputStream
{
private final File _file;
TemporaryFileInputStream(File file)
throws FileNotFoundException
{
super(new FileInputStream(file));
_file = file;
}
public void close()
throws IOException
{
super.close();
_file.delete();
}
}
}
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