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org.bouncycastle.mail.smime.SMIMEUtil Maven / Gradle / Ivy
package org.bouncycastle.mail.smime;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.Enumeration;
import javax.mail.BodyPart;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Part;
import javax.mail.internet.ContentType;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMultipart;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.cert.jcajce.JcaX509CertificateHolder;
import org.bouncycastle.cms.CMSTypedStream;
import org.bouncycastle.mail.smime.util.CRLFOutputStream;
import org.bouncycastle.mail.smime.util.FileBackedMimeBodyPart;
import org.bouncycastle.util.Strings;
public class SMIMEUtil
{
private static final String MULTIPART = "multipart";
private static final int BUF_SIZE = 32760;
public static boolean isMultipartContent(Part part)
throws MessagingException
{
String partType = Strings.toLowerCase(part.getContentType());
return partType.startsWith(MULTIPART);
}
static boolean isCanonicalisationRequired(
MimeBodyPart bodyPart,
String defaultContentTransferEncoding)
throws MessagingException
{
String[] cte = bodyPart.getHeader("Content-Transfer-Encoding");
String contentTransferEncoding;
if (cte == null)
{
contentTransferEncoding = defaultContentTransferEncoding;
}
else
{
contentTransferEncoding = cte[0];
}
return !contentTransferEncoding.equalsIgnoreCase("binary");
}
static class LineOutputStream extends FilterOutputStream
{
private static byte newline[];
public LineOutputStream(OutputStream outputstream)
{
super(outputstream);
}
public void writeln(String s)
throws MessagingException
{
try
{
byte abyte0[] = getBytes(s);
super.out.write(abyte0);
super.out.write(newline);
}
catch(Exception exception)
{
throw new MessagingException("IOException", exception);
}
}
public void writeln()
throws MessagingException
{
try
{
super.out.write(newline);
}
catch(Exception exception)
{
throw new MessagingException("IOException", exception);
}
}
static
{
newline = new byte[2];
newline[0] = 13;
newline[1] = 10;
}
private static byte[] getBytes(String s)
{
char ac[] = s.toCharArray();
int i = ac.length;
byte abyte0[] = new byte[i];
int j = 0;
while (j < i)
{
abyte0[j] = (byte)ac[j++];
}
return abyte0;
}
}
/**
* internal preamble is generally included in signatures, while this is technically wrong,
* if we find internal preamble we include it by default.
*/
static void outputPreamble(LineOutputStream lOut, MimeBodyPart part, String boundary)
throws MessagingException, IOException
{
InputStream in;
try
{
in = part.getRawInputStream();
}
catch (MessagingException e)
{
return; // no underlying content rely on default generation
}
String line;
while ((line = readLine(in)) != null)
{
if (line.equals(boundary))
{
break;
}
lOut.writeln(line);
}
in.close();
if (line == null)
{
throw new MessagingException("no boundary found");
}
}
/**
* internal postamble is generally included in signatures, while this is technically wrong,
* if we find internal postamble we include it by default.
*/
static void outputPostamble(LineOutputStream lOut, MimeBodyPart part, int count, String boundary)
throws MessagingException, IOException
{
InputStream in;
try
{
in = part.getRawInputStream();
}
catch (MessagingException e)
{
return; // no underlying content rely on default generation
}
String line;
int boundaries = count + 1;
while ((line = readLine(in)) != null)
{
if (line.startsWith(boundary))
{
boundaries--;
if (boundaries == 0)
{
break;
}
}
}
while ((line = readLine(in)) != null)
{
lOut.writeln(line);
}
in.close();
if (boundaries != 0)
{
throw new MessagingException("all boundaries not found for: " + boundary);
}
}
static void outputPostamble(LineOutputStream lOut, BodyPart parent, String parentBoundary, BodyPart part)
throws MessagingException, IOException
{
InputStream in;
try
{
in = ((MimeBodyPart)parent).getRawInputStream();
}
catch (MessagingException e)
{
return; // no underlying content rely on default generation
}
MimeMultipart multipart = (MimeMultipart)part.getContent();
ContentType contentType = new ContentType(multipart.getContentType());
String boundary = "--" + contentType.getParameter("boundary");
int count = multipart.getCount() + 1;
String line;
while (count != 0 && (line = readLine(in)) != null)
{
if (line.startsWith(boundary))
{
count--;
}
}
while ((line = readLine(in)) != null)
{
if (line.startsWith(parentBoundary))
{
break;
}
lOut.writeln(line);
}
in.close();
}
/*
* read a line of input stripping of the tailing \r\n
*/
private static String readLine(InputStream in)
throws IOException
{
StringBuffer b = new StringBuffer();
int ch;
while ((ch = in.read()) >= 0 && ch != '\n')
{
if (ch != '\r')
{
b.append((char)ch);
}
}
if (ch < 0 && b.length() == 0)
{
return null;
}
return b.toString();
}
static void outputBodyPart(
OutputStream out,
boolean topLevel,
BodyPart bodyPart,
String defaultContentTransferEncoding)
throws MessagingException, IOException
{
if (bodyPart instanceof MimeBodyPart)
{
MimeBodyPart mimePart = (MimeBodyPart)bodyPart;
String[] cte = mimePart.getHeader("Content-Transfer-Encoding");
String contentTransferEncoding;
if (isMultipartContent(mimePart))
{
Object content = bodyPart.getContent();
Multipart mp;
if (content instanceof Multipart)
{
mp = (Multipart)content;
}
else
{
mp = new MimeMultipart(bodyPart.getDataHandler().getDataSource());
}
ContentType contentType = new ContentType(mp.getContentType());
String boundary = "--" + contentType.getParameter("boundary");
SMIMEUtil.LineOutputStream lOut = new SMIMEUtil.LineOutputStream(out);
Enumeration headers = mimePart.getAllHeaderLines();
while (headers.hasMoreElements())
{
String header = (String)headers.nextElement();
lOut.writeln(header);
}
lOut.writeln(); // CRLF separator
outputPreamble(lOut, mimePart, boundary);
for (int i = 0; i < mp.getCount(); i++)
{
lOut.writeln(boundary);
BodyPart part = mp.getBodyPart(i);
outputBodyPart(out, false, part, defaultContentTransferEncoding);
if (!isMultipartContent(part))
{
lOut.writeln(); // CRLF terminator needed
}
else
{ // output nested preamble
outputPostamble(lOut, mimePart, boundary, part);
}
}
lOut.writeln(boundary + "--");
if (topLevel)
{
outputPostamble(lOut, mimePart, mp.getCount(), boundary);
}
return;
}
if (cte == null)
{
contentTransferEncoding = defaultContentTransferEncoding;
}
else
{
contentTransferEncoding = cte[0];
}
if (!contentTransferEncoding.equalsIgnoreCase("base64")
&& !contentTransferEncoding.equalsIgnoreCase("quoted-printable"))
{
if (!contentTransferEncoding.equalsIgnoreCase("binary"))
{
out = new CRLFOutputStream(out);
}
bodyPart.writeTo(out);
out.flush();
return;
}
boolean base64 = contentTransferEncoding.equalsIgnoreCase("base64");
//
// Write raw content, performing canonicalization
//
InputStream inRaw;
try
{
inRaw = mimePart.getRawInputStream();
}
catch (MessagingException e)
{
// this is less than ideal, but if the raw output stream is unavailable it's the
// best option we've got.
out = new CRLFOutputStream(out);
bodyPart.writeTo(out);
out.flush();
return;
}
//
// Write headers
//
LineOutputStream outLine = new LineOutputStream(out);
for (Enumeration e = mimePart.getAllHeaderLines(); e.hasMoreElements();)
{
String header = (String)e.nextElement();
outLine.writeln(header);
}
outLine.writeln();
outLine.flush();
OutputStream outCRLF;
if (base64)
{
outCRLF = new Base64CRLFOutputStream(out);
}
else
{
outCRLF = new CRLFOutputStream(out);
}
byte[] buf = new byte[BUF_SIZE];
int len;
while ((len = inRaw.read(buf, 0, buf.length)) > 0)
{
outCRLF.write(buf, 0, len);
}
inRaw.close();
outCRLF.flush();
}
else
{
if (!defaultContentTransferEncoding.equalsIgnoreCase("binary"))
{
out = new CRLFOutputStream(out);
}
bodyPart.writeTo(out);
out.flush();
}
}
/**
* return the MimeBodyPart described in the raw bytes provided in content
*/
public static MimeBodyPart toMimeBodyPart(
byte[] content)
throws SMIMEException
{
return toMimeBodyPart(new ByteArrayInputStream(content));
}
/**
* return the MimeBodyPart described in the input stream content
*/
public static MimeBodyPart toMimeBodyPart(
InputStream content)
throws SMIMEException
{
try
{
return new MimeBodyPart(content);
}
catch (MessagingException e)
{
throw new SMIMEException("exception creating body part.", e);
}
}
static FileBackedMimeBodyPart toWriteOnceBodyPart(
CMSTypedStream content)
throws SMIMEException
{
try
{
return new WriteOnceFileBackedMimeBodyPart(content.getContentStream(), File.createTempFile("bcMail", ".mime"));
}
catch (IOException e)
{
throw new SMIMEException("IOException creating tmp file:" + e.getMessage(), e);
}
catch (MessagingException e)
{
throw new SMIMEException("can't create part: " + e, e);
}
}
/**
* return a file backed MimeBodyPart described in {@link CMSTypedStream} content.
*/
public static FileBackedMimeBodyPart toMimeBodyPart(
CMSTypedStream content)
throws SMIMEException
{
try
{
return toMimeBodyPart(content, File.createTempFile("bcMail", ".mime"));
}
catch (IOException e)
{
throw new SMIMEException("IOException creating tmp file:" + e.getMessage(), e);
}
}
/**
* Return a file based MimeBodyPart represented by content and backed
* by the file represented by file.
*
* @param content content stream containing body part.
* @param file file to store the decoded body part in.
* @return the decoded body part.
* @throws SMIMEException
*/
public static FileBackedMimeBodyPart toMimeBodyPart(
CMSTypedStream content,
File file)
throws SMIMEException
{
try
{
return new FileBackedMimeBodyPart(content.getContentStream(), file);
}
catch (IOException e)
{
throw new SMIMEException("can't save content to file: " + e, e);
}
catch (MessagingException e)
{
throw new SMIMEException("can't create part: " + e, e);
}
}
/**
* Return a CMS IssuerAndSerialNumber structure for the passed in X.509 certificate.
*
* @param cert the X.509 certificate to get the issuer and serial number for.
* @return an IssuerAndSerialNumber structure representing the certificate.
*/
public static IssuerAndSerialNumber createIssuerAndSerialNumberFor(
X509Certificate cert)
throws CertificateParsingException
{
try
{
return new IssuerAndSerialNumber(new JcaX509CertificateHolder(cert).getIssuer(), cert.getSerialNumber());
}
catch (Exception e)
{
throw new CertificateParsingException("exception extracting issuer and serial number: " + e);
}
}
private static class WriteOnceFileBackedMimeBodyPart
extends FileBackedMimeBodyPart
{
public WriteOnceFileBackedMimeBodyPart(InputStream content, File file)
throws MessagingException, IOException
{
super(content, file);
}
public void writeTo(OutputStream out)
throws MessagingException, IOException
{
super.writeTo(out);
this.dispose();
}
}
static class Base64CRLFOutputStream extends FilterOutputStream
{
protected int lastb;
protected static byte newline[];
private boolean isCrlfStream;
public Base64CRLFOutputStream(OutputStream outputstream)
{
super(outputstream);
lastb = -1;
}
public void write(int i)
throws IOException
{
if (i == '\r')
{
out.write(newline);
}
else if (i == '\n')
{
if (lastb != '\r')
{ // imagine my joy[]
if (!(isCrlfStream && lastb == '\n'))
{
out.write(newline);
}
}
else
{
isCrlfStream = true;
}
}
else
{
out.write(i);
}
lastb = i;
}
public void write(byte[] buf)
throws IOException
{
this.write(buf, 0, buf.length);
}
public void write(byte buf[], int off, int len)
throws IOException
{
for (int i = off; i != off + len; i++)
{
this.write(buf[i]);
}
}
public void writeln()
throws IOException
{
super.out.write(newline);
}
static
{
newline = new byte[2];
newline[0] = '\r';
newline[1] = '\n';
}
}
}
