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Code Issues Releases Wiki Activity

PGP inline support

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M66B 2018-11-10 15:50:08 +00:00
parent f454edd57d
commit bb7c730936
2 changed files with 97 additions and 59 deletions
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2
FAQ.md
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@ -174,7 +174,7 @@ To encrypt a message before sending, just select the menu *Encrypt*. Similarly,
Encryption is [Autocrypt](https://autocrypt.org/) compatible. For security reasons received messages are not decrypted automatically.
Encryption/decryption is a pro feature.
Inline PGP is not supported, see [here](https://josefsson.org/inline-openpgp-considered-harmful.html) why not.
Sending inline PGP encrypted messages is not supported, see [here](https://josefsson.org/inline-openpgp-considered-harmful.html) about why not.
Note that signed only or encrypted only messages are not supported, see here for some considerations:

154
app/src/main/java/eu/faircode/email/ActivityView.java
View file

@ -62,6 +62,7 @@ import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.text.Collator;
@ -125,6 +126,9 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
static final String UPDATE_LATEST_API = "https://api.github.com/repos/M66B/open-source-email/releases/latest";
static final long UPDATE_INTERVAL = 12 * 3600 * 1000L; // milliseconds
private static final String PGP_BEGIN_MESSAGE = "-----BEGIN PGP MESSAGE-----";
private static final String PGP_END_MESSAGE = "-----END PGP MESSAGE-----";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
@ -976,76 +980,110 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
DB db = DB.getInstance(context);
boolean inline = false;
InputStream encrypted = null;
// Find encrypted data
boolean found = false;
List<EntityAttachment> attachments = db.attachment().getAttachments(id);
for (EntityAttachment attachment : attachments)
if ("encrypted.asc".equals(attachment.name)) {
if (!attachment.available)
throw new IllegalArgumentException(getString(R.string.title_attachments_missing));
found = true;
// Serialize encrypted data
FileInputStream encrypted = new FileInputStream(EntityAttachment.getFile(context, attachment.id));
ByteArrayOutputStream decrypted = new ByteArrayOutputStream();
// Decrypt message
OpenPgpApi api = new OpenPgpApi(context, pgpService.getService());
Intent result = api.executeApi(data, encrypted, decrypted);
switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_ERROR)) {
case OpenPgpApi.RESULT_CODE_SUCCESS:
// Decode message
Properties props = MessageHelper.getSessionProperties(Helper.AUTH_TYPE_PASSWORD, false);
Session isession = Session.getInstance(props, null);
ByteArrayInputStream is = new ByteArrayInputStream(decrypted.toByteArray());
MimeMessage imessage = new MimeMessage(isession, is);
MessageHelper helper = new MessageHelper(imessage);
try {
db.beginTransaction();
// Write decrypted body
EntityMessage m = db.message().getMessage(id);
m.write(context, helper.getHtml());
// Remove previously decrypted attachments
for (EntityAttachment a : attachments)
if (!"encrypted.asc".equals(a.name))
db.attachment().deleteAttachment(a.id);
// Add decrypted attachments
int sequence = db.attachment().getAttachmentSequence(id);
for (EntityAttachment a : helper.getAttachments()) {
a.message = id;
a.sequence = ++sequence;
a.id = db.attachment().insertAttachment(a);
}
db.message().setMessageStored(id, new Date().getTime());
db.setTransactionSuccessful();
} finally {
db.endTransaction();
}
break;
case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
message = id;
return result.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
case OpenPgpApi.RESULT_CODE_ERROR:
OpenPgpError error = result.getParcelableExtra(OpenPgpApi.RESULT_ERROR);
throw new IllegalArgumentException(error.getMessage());
}
encrypted = new FileInputStream(EntityAttachment.getFile(context, attachment.id));
break;
}
if (!found)
if (encrypted == null) {
EntityMessage message = db.message().getMessage(id);
if (message.content) {
String body = message.read(context);
if (body != null) {
int begin = body.indexOf(PGP_BEGIN_MESSAGE);
int end = body.indexOf(PGP_END_MESSAGE);
if (begin >= 0 && begin < end) {
String section = body.substring(begin, end + PGP_END_MESSAGE.length());
section = section.replace("<br />", "\n\r");
inline = true;
encrypted = new ByteArrayInputStream(section.getBytes());
}
}
}
}
if (encrypted == null)
throw new IllegalArgumentException(getString(R.string.title_not_encrypted));
ByteArrayOutputStream decrypted = new ByteArrayOutputStream();
// Decrypt message
OpenPgpApi api = new OpenPgpApi(context, pgpService.getService());
Intent result = api.executeApi(data, encrypted, decrypted);
switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_ERROR)) {
case OpenPgpApi.RESULT_CODE_SUCCESS:
if (inline) {
try {
db.beginTransaction();
// Write decrypted body
EntityMessage m = db.message().getMessage(id);
m.write(context, decrypted.toString());
db.message().setMessageStored(id, new Date().getTime());
db.setTransactionSuccessful();
} finally {
db.endTransaction();
}
} else {
// Decode message
Properties props = MessageHelper.getSessionProperties(Helper.AUTH_TYPE_PASSWORD, false);
Session isession = Session.getInstance(props, null);
ByteArrayInputStream is = new ByteArrayInputStream(decrypted.toByteArray());
MimeMessage imessage = new MimeMessage(isession, is);
MessageHelper helper = new MessageHelper(imessage);
try {
db.beginTransaction();
// Write decrypted body
EntityMessage m = db.message().getMessage(id);
m.write(context, helper.getHtml());
// Remove previously decrypted attachments
for (EntityAttachment a : attachments)
if (!"encrypted.asc".equals(a.name))
db.attachment().deleteAttachment(a.id);
// Add decrypted attachments
int sequence = db.attachment().getAttachmentSequence(id);
for (EntityAttachment a : helper.getAttachments()) {
a.message = id;
a.sequence = ++sequence;
a.id = db.attachment().insertAttachment(a);
}
db.message().setMessageStored(id, new Date().getTime());
db.setTransactionSuccessful();
} finally {
db.endTransaction();
}
}
break;
case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
message = id;
return result.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
case OpenPgpApi.RESULT_CODE_ERROR:
OpenPgpError error = result.getParcelableExtra(OpenPgpApi.RESULT_ERROR);
throw new IllegalArgumentException(error.getMessage());
}
return null;
}