msb-public
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FairEmail
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Code Issues Projects Releases Wiki Activity

Scan/starttls

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pull/199/head
M66B 3 years ago
parent c728b18036
commit a33270a24e
1 changed files with 112 additions and 21 deletions
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133
app/src/main/java/eu/faircode/email/EmailProvider.java
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@ -28,10 +28,13 @@ import android.text.TextUtils;
import androidx.annotation.NonNull;
import com.sun.mail.util.LineInputStream;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import java.io.BufferedInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
@ -39,6 +42,8 @@ import java.net.ConnectException;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketException;
import java.net.URL;
import java.net.UnknownHostException;
import java.security.cert.Certificate;
@ -55,6 +60,7 @@ import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import javax.net.SocketFactory;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
@ -238,6 +244,16 @@ public class EmailProvider implements Parcelable {
if (PROPRIETARY.contains(domain))
throw new IllegalArgumentException(context.getString(R.string.title_no_standard));
if (BuildConfig.DEBUG && false)
try {
// Scan ports
Log.i("Provider from template domain=" + domain);
return fromTemplate(context, domain, discover);
} catch (Throwable ex) {
Log.w(ex);
throw new UnknownHostException(context.getString(R.string.title_setup_no_settings, domain));
}
List<EmailProvider> providers = loadProfiles(context);
for (EmailProvider provider : providers)
if (provider.domain != null)
@ -794,32 +810,39 @@ public class EmailProvider implements Parcelable {
for (InetAddress iaddr : InetAddress.getAllByName(host)) {
InetSocketAddress address = new InetSocketAddress(iaddr, Server.this.port);
SSLSocketFactory factory = (SSLSocketFactory) SSLSocketFactory.getDefault();
try (SSLSocket socket = (SSLSocket) factory.createSocket()) {
SocketFactory factory = (starttls
? SocketFactory.getDefault()
: SSLSocketFactory.getDefault());
try (Socket socket = factory.createSocket()) {
EntityLog.log(context, "Connecting to " + address);
socket.connect(address, SCAN_TIMEOUT);
EntityLog.log(context, "Connected " + address);
if (!starttls)
try {
socket.setSoTimeout(SCAN_TIMEOUT);
socket.startHandshake();
Certificate[] certs = socket.getSession().getPeerCertificates();
for (Certificate cert : certs)
if (cert instanceof X509Certificate) {
List<String> names = ConnectionHelper.getDnsNames((X509Certificate) cert);
if (ConnectionHelper.matches(host, names)) {
EntityLog.log(context, "Trusted " + address);
return true;
}
socket.setSoTimeout(SCAN_TIMEOUT);
try (SSLSocket sslSocket = starttls
? starttls(socket, context)
: (SSLSocket) socket) {
sslSocket.startHandshake();
Certificate[] certs = sslSocket.getSession().getPeerCertificates();
for (Certificate cert : certs)
if (cert instanceof X509Certificate) {
List<String> names = ConnectionHelper.getDnsNames((X509Certificate) cert);
EntityLog.log(context, "Certificate " + address +
" " + TextUtils.join(",", names));
if (ConnectionHelper.matches(host, names)) {
EntityLog.log(context, "Trusted " + address);
return true;
}
EntityLog.log(context, "Untrusted " + address);
return null;
} catch (Throwable ex) {
// Typical:
// javax.net.ssl.SSLException: Unable to parse TLS packet header
EntityLog.log(context, "Handshake " + address + ": " + Log.formatThrowable(ex));
}
}
EntityLog.log(context, "Untrusted " + address);
return null;
} catch (Throwable ex) {
// Typical:
// javax.net.ssl.SSLException: Unable to parse TLS packet header
EntityLog.log(context, "Handshake " + address + ": " + Log.formatThrowable(ex));
}
EntityLog.log(context, "Reachable " + address);
return true;
@ -848,6 +871,74 @@ public class EmailProvider implements Parcelable {
});
}
private SSLSocket starttls(Socket socket, Context context) throws IOException {
String response;
String command;
boolean has = false;
LineInputStream lis =
new LineInputStream(
new BufferedInputStream(
socket.getInputStream()));
if (port == 587) {
do {
response = lis.readLine();
if (response != null)
EntityLog.log(context, socket.getRemoteSocketAddress() + " <" + response);
} while (response != null && !response.startsWith("220 "));
command = "EHLO " + EmailService.getDefaultEhlo() + "\n";
EntityLog.log(context, socket.getRemoteSocketAddress() + " >" + command);
socket.getOutputStream().write(command.getBytes());
do {
response = lis.readLine();
if (response != null) {
EntityLog.log(context, socket.getRemoteSocketAddress() + " <" + response);
if (response.contains("STARTTLS"))
has = true;
}
} while (response != null &&
response.length() >= 4 && response.charAt(3) == '-');
if (has) {
command = "STARTTLS\n";
EntityLog.log(context, socket.getRemoteSocketAddress() + " >" + command);
socket.getOutputStream().write(command.getBytes());
}
} else if (port == 143) {
do {
response = lis.readLine();
if (response != null) {
EntityLog.log(context, socket.getRemoteSocketAddress() + " <" + response);
if (response.contains("STARTTLS"))
has = true;
}
} while (response != null &&
!response.startsWith("* OK"));
if (has) {
command = "A001 STARTTLS\n";
EntityLog.log(context, socket.getRemoteSocketAddress() + " >" + command);
socket.getOutputStream().write(command.getBytes());
}
}
if (has) {
do {
response = lis.readLine();
if (response != null)
EntityLog.log(context, socket.getRemoteSocketAddress() + " <" + response);
} while (response != null &&
!(response.startsWith("A001 OK") || response.startsWith("220 ")));
SSLSocketFactory sslFactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
return (SSLSocket) sslFactory.createSocket(socket, host, port, false);
} else
throw new SocketException("No STARTTLS");
}
@NonNull
@Override
public String toString() {

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