mirror of
https://github.com/moparisthebest/k-9
synced 2024-11-23 09:52:16 -05:00
First attempt at decrypting PGP/MIME messages
This commit is contained in:
cketti
parent
bb83fdc0e8
commit
7f811fce2c
@ -2,6 +2,7 @@
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package com.fsck.k9.mail;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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public interface Part {
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@ -7,13 +7,15 @@ import java.util.Stack;
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import com.fsck.k9.mail.Body;
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import com.fsck.k9.mail.BodyPart;
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import com.fsck.k9.mail.MessagingException;
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import com.fsck.k9.mail.Multipart;
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import com.fsck.k9.mail.Part;
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import com.fsck.k9.mail.internet.MimeUtility;
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public class MessageDecryptor {
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private static final String MULTIPART_ENCRYPTED = "multipart/encrypted";
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private static final String PROTOCOL_PARAMETER = "protocol";
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private static final String APPLICATION_PGP_ENCRYPTED = "application/pgp-encrypted";
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public static List<Part> findEncryptedParts(Part startPart) {
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List<Part> encryptedParts = new ArrayList<Part>();
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@ -38,4 +40,12 @@ public class MessageDecryptor {
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return encryptedParts;
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}
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public static boolean isPgpMimeEncryptedPart(Part part) {
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//FIXME: Doesn't work right now because LocalMessage.getContentType() doesn't load headers from database
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// String contentType = part.getContentType();
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// String protocol = MimeUtility.getHeaderParameter(contentType, PROTOCOL_PARAMETER);
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// return APPLICATION_PGP_ENCRYPTED.equals(protocol);
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return true;
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}
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}
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@ -0,0 +1,200 @@
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package com.fsck.k9.mailstore;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Stack;
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import com.fsck.k9.mail.Body;
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import com.fsck.k9.mail.BodyPart;
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import com.fsck.k9.mail.Message;
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import com.fsck.k9.mail.MessagingException;
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import com.fsck.k9.mail.Multipart;
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import com.fsck.k9.mail.Part;
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import com.fsck.k9.mail.internet.MimeBodyPart;
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import com.fsck.k9.mail.internet.MimeMessage;
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import com.fsck.k9.mail.internet.MimeMultipart;
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import com.fsck.k9.mail.internet.MimeUtility;
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import org.apache.commons.io.IOUtils;
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import org.apache.james.mime4j.MimeException;
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import org.apache.james.mime4j.io.EOLConvertingInputStream;
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import org.apache.james.mime4j.parser.ContentHandler;
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import org.apache.james.mime4j.parser.MimeStreamParser;
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import org.apache.james.mime4j.stream.BodyDescriptor;
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import org.apache.james.mime4j.stream.Field;
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import org.apache.james.mime4j.stream.MimeConfig;
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public class DecryptStreamParser {
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public static DecryptedBodyPart parse(Part multipartEncrypted, InputStream inputStream) throws MessagingException, IOException {
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DecryptedBodyPart decryptedRootPart = new DecryptedBodyPart(multipartEncrypted);
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MimeConfig parserConfig = new MimeConfig();
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parserConfig.setMaxHeaderLen(-1);
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parserConfig.setMaxLineLen(-1);
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parserConfig.setMaxHeaderCount(-1);
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MimeStreamParser parser = new MimeStreamParser(parserConfig);
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parser.setContentHandler(new PartBuilder(multipartEncrypted, decryptedRootPart));
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parser.setRecurse();
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try {
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parser.parse(new EOLConvertingInputStream(inputStream));
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} catch (MimeException e) {
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throw new MessagingException("Failed to parse decrypted content", e);
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}
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return decryptedRootPart;
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}
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private static Body createBody(InputStream inputStream, String transferEncoding) throws IOException {
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//TODO: only read parts we're going to display into memory
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ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
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try {
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IOUtils.copy(inputStream, byteArrayOutputStream);
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} finally {
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byteArrayOutputStream.close();
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}
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byte[] data = byteArrayOutputStream.toByteArray();
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return new BinaryMemoryBody(data, transferEncoding);
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}
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private static class PartBuilder implements ContentHandler {
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private final Part multipartEncrypted;
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private final DecryptedBodyPart decryptedRootPart;
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private final Stack<Object> stack = new Stack<Object>();
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public PartBuilder(Part multipartEncrypted, DecryptedBodyPart decryptedRootPart) throws MessagingException {
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this.multipartEncrypted = multipartEncrypted;
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this.decryptedRootPart = decryptedRootPart;
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}
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@Override
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public void startMessage() throws MimeException {
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if (stack.isEmpty()) {
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stack.push(decryptedRootPart);
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} else {
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Part part = (Part) stack.peek();
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Message innerMessage = new DecryptedMimeMessage(multipartEncrypted);
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part.setBody(innerMessage);
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stack.push(innerMessage);
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}
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}
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@Override
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public void endMessage() throws MimeException {
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stack.pop();
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}
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@Override
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public void startBodyPart() throws MimeException {
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try {
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Multipart multipart = (Multipart) stack.peek();
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BodyPart bodyPart = new DecryptedBodyPart(multipartEncrypted);
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multipart.addBodyPart(bodyPart);
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stack.push(bodyPart);
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} catch (MessagingException e) {
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throw new MimeException(e);
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}
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}
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@Override
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public void endBodyPart() throws MimeException {
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stack.pop();
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}
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@Override
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public void startHeader() throws MimeException {
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// Do nothing
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}
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@Override
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public void field(Field parsedField) throws MimeException {
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try {
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String name = parsedField.getName();
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String raw = parsedField.getRaw().toString();
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Part part = (Part) stack.peek();
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part.addRawHeader(name, raw);
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} catch (MessagingException e) {
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throw new MimeException(e);
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}
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}
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@Override
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public void endHeader() throws MimeException {
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// Do nothing
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}
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@Override
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public void preamble(InputStream is) throws MimeException, IOException {
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// Do nothing
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}
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@Override
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public void epilogue(InputStream is) throws MimeException, IOException {
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// Do nothing
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}
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@Override
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public void startMultipart(BodyDescriptor bd) throws MimeException {
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Part part = (Part) stack.peek();
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try {
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String contentType = part.getContentType();
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String mimeType = MimeUtility.getHeaderParameter(contentType, null);
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String boundary = MimeUtility.getHeaderParameter(contentType, "boundary");
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MimeMultipart multipart = new MimeMultipart(mimeType, boundary);
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part.setBody(multipart);
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stack.push(multipart);
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} catch (MessagingException e) {
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throw new MimeException(e);
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}
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}
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@Override
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public void endMultipart() throws MimeException {
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stack.pop();
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}
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@Override
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public void body(BodyDescriptor bd, InputStream inputStream) throws MimeException, IOException {
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Part part = (Part) stack.peek();
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String transferEncoding = bd.getTransferEncoding();
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Body body = createBody(inputStream, transferEncoding);
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part.setBody(body);
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}
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@Override
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public void raw(InputStream is) throws MimeException, IOException {
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throw new IllegalStateException("Not implemented");
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}
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}
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public static class DecryptedBodyPart extends MimeBodyPart {
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private final Part multipartEncrypted;
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public DecryptedBodyPart(Part multipartEncrypted) throws MessagingException {
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this.multipartEncrypted = multipartEncrypted;
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}
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}
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public static class DecryptedMimeMessage extends MimeMessage {
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private final Part multipartEncrypted;
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public DecryptedMimeMessage(Part multipartEncrypted) {
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this.multipartEncrypted = multipartEncrypted;
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}
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}
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}
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@ -442,7 +442,8 @@ public class LocalMessageExtractor {
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return new AttachmentViewInfo(mimeType, displayName, size, uri, firstClassAttachment, part);
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} else {
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throw new IllegalStateException("Not supported yet");
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//FIXME: The content provider URI thing needs to be reworked
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return extractAttachmentInfo(part, null);
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}
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}
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@ -1,7 +1,13 @@
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package com.fsck.k9.ui.messageview;
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import java.io.IOException;
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import java.io.PipedInputStream;
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import java.io.PipedOutputStream;
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import java.util.ArrayDeque;
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import java.util.Collections;
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import java.util.Deque;
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import java.util.List;
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import java.util.Locale;
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import android.app.Activity;
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@ -14,6 +20,7 @@ import android.content.Context;
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import android.content.Intent;
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import android.content.Loader;
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import android.net.Uri;
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import android.os.AsyncTask;
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import android.os.Bundle;
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import android.os.Handler;
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import android.text.TextUtils;
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@ -27,6 +34,7 @@ import android.view.ViewGroup;
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import android.widget.Toast;
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import com.fsck.k9.Account;
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import com.fsck.k9.Identity;
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import com.fsck.k9.K9;
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import com.fsck.k9.Preferences;
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import com.fsck.k9.R;
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@ -34,21 +42,35 @@ import com.fsck.k9.activity.ChooseFolder;
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import com.fsck.k9.activity.MessageReference;
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import com.fsck.k9.controller.MessagingController;
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import com.fsck.k9.controller.MessagingListener;
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import com.fsck.k9.crypto.MessageDecryptor;
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import com.fsck.k9.crypto.OpenPgpApiHelper;
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import com.fsck.k9.crypto.PgpData;
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import com.fsck.k9.fragment.ConfirmationDialogFragment;
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import com.fsck.k9.fragment.ConfirmationDialogFragment.ConfirmationDialogFragmentListener;
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import com.fsck.k9.fragment.ProgressDialogFragment;
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import com.fsck.k9.helper.FileBrowserHelper;
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import com.fsck.k9.helper.FileBrowserHelper.FileBrowserFailOverCallback;
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import com.fsck.k9.helper.IdentityHelper;
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import com.fsck.k9.mail.Body;
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import com.fsck.k9.mail.BodyPart;
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import com.fsck.k9.mail.Flag;
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import com.fsck.k9.mail.MessagingException;
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import com.fsck.k9.mail.Multipart;
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import com.fsck.k9.mail.Part;
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import com.fsck.k9.mailstore.AttachmentViewInfo;
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import com.fsck.k9.mailstore.DecryptStreamParser;
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import com.fsck.k9.mailstore.DecryptStreamParser.DecryptedBodyPart;
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import com.fsck.k9.mailstore.LocalMessage;
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import com.fsck.k9.mailstore.MessageViewInfo;
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import com.fsck.k9.ui.message.DecodeMessageLoader;
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import com.fsck.k9.ui.message.LocalMessageLoader;
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import com.fsck.k9.view.MessageHeader;
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import org.openintents.openpgp.IOpenPgpService;
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import org.openintents.openpgp.OpenPgpSignatureResult;
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import org.openintents.openpgp.util.OpenPgpApi;
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import org.openintents.openpgp.util.OpenPgpApi.IOpenPgpCallback;
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import org.openintents.openpgp.util.OpenPgpServiceConnection;
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import org.openintents.openpgp.util.OpenPgpServiceConnection.OnBound;
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public class MessageViewFragment extends Fragment implements ConfirmationDialogFragmentListener,
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@ -109,6 +131,9 @@ public class MessageViewFragment extends Fragment implements ConfirmationDialogF
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private LoaderCallbacks<MessageViewInfo> decodeMessageLoaderCallback = new DecodeMessageLoaderCallback();
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private MessageViewInfo messageViewInfo;
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private AttachmentViewInfo currentAttachmentViewInfo;
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private Deque<Part> partsToDecrypt;
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private OpenPgpApi openPgpApi;
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private Part currentlyDecryptingPart;
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@Override
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@ -223,11 +248,177 @@ public class MessageViewFragment extends Fragment implements ConfirmationDialogF
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if (message.isBodyMissing()) {
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startDownloadingMessageBody(message);
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} else {
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decryptMessagePartsIfNecessary(message);
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}
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}
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private void decryptMessagePartsIfNecessary(LocalMessage message) {
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List<Part> encryptedParts = MessageDecryptor.findEncryptedParts(message);
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if (!encryptedParts.isEmpty()) {
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partsToDecrypt = new ArrayDeque<Part>(encryptedParts);
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decryptNextPartOrStartExtractingTextAndAttachments();
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} else {
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startExtractingTextAndAttachments(message);
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}
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}
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private void decryptNextPartOrStartExtractingTextAndAttachments() {
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if (partsToDecrypt.isEmpty()) {
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startExtractingTextAndAttachments(mMessage);
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return;
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}
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Part part = partsToDecrypt.peekFirst();
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if (MessageDecryptor.isPgpMimeEncryptedPart(part)) {
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startDecryptingPart(part);
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} else {
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// Note: We currently only support PGP/MIME multipart/encrypted parts
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partsToDecrypt.removeFirst();
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decryptNextPartOrStartExtractingTextAndAttachments();
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}
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}
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private void startDecryptingPart(Part part) {
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Multipart multipart = (Multipart) part.getBody();
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if (multipart == null) {
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throw new RuntimeException("Downloading missing parts before decryption isn't supported yet");
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}
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if (!isBoundToCryptoProviderService()) {
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connectToCryptoProviderService();
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} else {
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decryptPart(part);
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}
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}
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private boolean isBoundToCryptoProviderService() {
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return openPgpApi != null;
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}
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private void connectToCryptoProviderService() {
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String openPgpProvider = mAccount.getOpenPgpProvider();
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new OpenPgpServiceConnection(getContext(), openPgpProvider,
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new OnBound() {
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@Override
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public void onBound(IOpenPgpService service) {
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openPgpApi = new OpenPgpApi(getContext(), service);
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decryptNextPartOrStartExtractingTextAndAttachments();
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}
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@Override
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public void onError(Exception e) {
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Log.e(K9.LOG_TAG, "Couldn't connect to OpenPgpService", e);
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}
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}).bindToService();
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}
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private void decryptPart(Part part) {
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currentlyDecryptingPart = part;
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decryptVerify(new Intent());
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}
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private void decryptVerify(Intent intent) {
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intent.setAction(OpenPgpApi.ACTION_DECRYPT_VERIFY);
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Identity identity = IdentityHelper.getRecipientIdentityFromMessage(mAccount, mMessage);
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String accountName = OpenPgpApiHelper.buildAccountName(identity);
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intent.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, accountName);
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try {
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PipedInputStream pipedInputStream = getPipedInputStreamForEncryptedData();
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PipedOutputStream decryptedOutputStream = getPipedOutputStreamForDecryptedData();
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openPgpApi.executeApiAsync(intent, pipedInputStream, decryptedOutputStream, new IOpenPgpCallback() {
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@Override
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public void onReturn(Intent result) {
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//TODO: check result code
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//TODO: signal to AsyncTask in getPipedOutputStreamForDecryptedData() that we have a result code
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//TODO: handle RESULT_INTENT
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}
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});
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} catch (IOException e) {
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Log.e(K9.LOG_TAG, "IOException", e);
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}
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}
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private PipedInputStream getPipedInputStreamForEncryptedData() throws IOException {
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PipedInputStream pipedInputStream = new PipedInputStream();
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final PipedOutputStream out = new PipedOutputStream(pipedInputStream);
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new Thread(new Runnable() {
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@Override
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public void run() {
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try {
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Multipart multipartEncryptedMultipart = (Multipart) currentlyDecryptingPart.getBody();
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BodyPart encryptionPayloadPart = multipartEncryptedMultipart.getBodyPart(1);
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Body encryptionPayloadBody = encryptionPayloadPart.getBody();
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encryptionPayloadBody.writeTo(out);
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} catch (Exception e) {
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Log.e(K9.LOG_TAG, "Exception while writing message to crypto provider", e);
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}
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}
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}).start();
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return pipedInputStream;
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}
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private PipedOutputStream getPipedOutputStreamForDecryptedData() throws IOException {
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PipedOutputStream decryptedOutputStream = new PipedOutputStream();
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final PipedInputStream decryptedInputStream = new PipedInputStream(decryptedOutputStream);
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new AsyncTask<Void, Void, DecryptedBodyPart>() {
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@Override
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protected DecryptedBodyPart doInBackground(Void... params) {
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try {
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DecryptedBodyPart decryptedPart =
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DecryptStreamParser.parse(currentlyDecryptingPart, decryptedInputStream);
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//TODO: wait for IOpenPgpCallback.onReturn() to get the result code and only use
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// decryptedPart when the decryption was successful
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return decryptedPart;
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} catch (Exception e) {
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Log.e(K9.LOG_TAG, "Something went wrong while parsing the decrypted MIME part", e);
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//TODO: pass error to main thread and display error message to user
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}
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return null;
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}
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@Override
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protected void onPostExecute(DecryptedBodyPart decryptedPart) {
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if (decryptedPart == null) {
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onDecryptionFailed();
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} else {
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onDecryptionSuccess(decryptedPart);
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}
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}
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}.execute();
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return decryptedOutputStream;
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}
|
||||
|
||||
private void onDecryptionSuccess(DecryptedBodyPart decryptedPart) {
|
||||
addDecryptedPartToMessage(decryptedPart);
|
||||
onDecryptionFinished();
|
||||
}
|
||||
|
||||
private void addDecryptedPartToMessage(DecryptedBodyPart decryptedPart) {
|
||||
Multipart multipart = (Multipart) currentlyDecryptingPart.getBody();
|
||||
multipart.addBodyPart(decryptedPart);
|
||||
}
|
||||
|
||||
private void onDecryptionFailed() {
|
||||
//TODO: display error to user?
|
||||
onDecryptionFinished();
|
||||
}
|
||||
|
||||
private void onDecryptionFinished() {
|
||||
partsToDecrypt.removeFirst();
|
||||
decryptNextPartOrStartExtractingTextAndAttachments();
|
||||
}
|
||||
|
||||
private void onLoadMessageFromDatabaseFailed() {
|
||||
mMessageView.showStatusMessage(mContext.getString(R.string.status_invalid_id_error));
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user