msb-public
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FairEmail
mirror of https://github.com/M66B/FairEmail.git
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BouncyCastle: allow insecure encryption

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master
M66B 2 days ago
parent fa17d36a10
commit 5d4da42bcd
5 changed files with 56 additions and 13 deletions
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3
app/src/main/java/eu/faircode/email/ConnectionHelper.java
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@ -938,7 +938,7 @@ public class ConnectionHelper {
}
}
static SSLSocket starttls(Socket socket, String host, int port, Context context) throws IOException {
static SSLSocket starttls(SSLSocketFactory sslFactory, Socket socket, String host, int port, Context context) throws IOException {
String response;
String command;
boolean has = false;
@ -1006,7 +1006,6 @@ public class ConnectionHelper {
} 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");

7
app/src/main/java/eu/faircode/email/EmailProvider.java
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@ -1430,9 +1430,8 @@ public class EmailProvider implements Parcelable {
for (InetAddress iaddr : DnsHelper.getAllByName(context, host)) {
InetSocketAddress address = new InetSocketAddress(iaddr, Server.this.port);
SocketFactory factory = (starttls
? SocketFactory.getDefault()
: SSLSocketFactory.getDefault());
SSLSocketFactory sslFactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
SocketFactory factory = (starttls ? SocketFactory.getDefault() : sslFactory);
try (Socket socket = factory.createSocket()) {
EntityLog.log(context, "Connecting to " + address);
socket.connect(address, SCAN_TIMEOUT);
@ -1443,7 +1442,7 @@ public class EmailProvider implements Parcelable {
SSLSocket sslSocket = null;
try {
if (starttls)
sslSocket = ConnectionHelper.starttls(socket, host, port, context);
sslSocket = ConnectionHelper.starttls(sslFactory, socket, host, port, context);
else
sslSocket = (SSLSocket) socket;

8
app/src/main/java/eu/faircode/email/EmailService.java
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@ -170,8 +170,11 @@ public class EmailService implements AutoCloseable {
// TLS_EMPTY_RENEGOTIATION_INFO_SCSV https://tools.ietf.org/html/rfc5746
static {
// https://downloads.bouncycastle.org/fips-java/docs/BC-FJA-%28D%29TLSUserGuide-1.0.4.pdf
Security.setProperty("jdk.tls.disabledAlgorithms", "");
Security.setProperty("jdk.tls.client.protocols", "TLSv1.3,TLSv1.2,TLSv1.1,TLSv1,SSLv3");
System.setProperty("org.bouncycastle.jsse.client.dh.unrestrictedGroups", "true");
System.setProperty("org.bouncycastle.jsse.client.dh.minimumPrimeBits", "1024");
}
private EmailService() {
@ -1124,7 +1127,7 @@ public class EmailService implements AutoCloseable {
}
}
private static class SSLSocketFactoryService extends SSLSocketFactory {
static class SSLSocketFactoryService extends SSLSocketFactory {
// openssl s_client -connect host:port < /dev/null 2>/dev/null | openssl x509 -fingerprint -noout -in /dev/stdin
// nmap --script ssl-enum-ciphers -Pn -p port host
private String server;
@ -1195,8 +1198,7 @@ public class EmailService implements AutoCloseable {
@Override
public Socket createSocket() throws IOException {
Log.e("createSocket");
throw new IOException("createSocket");
return configure(factory.createSocket());
}
@Override

29
app/src/main/java/eu/faircode/email/FragmentOptionsConnection.java
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@ -44,6 +44,7 @@ import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ImageButton;
@ -122,6 +123,8 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
private EditText etHost;
private RadioGroup rgEncryption;
private EditText etPort;
private CheckBox cbInsecure;
private CheckBox cbDane;
private Button btnCheck;
private TextView tvNetworkInfo;
@ -196,6 +199,8 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
etHost = view.findViewById(R.id.etHost);
rgEncryption = view.findViewById(R.id.rgEncryption);
etPort = view.findViewById(R.id.etPort);
cbInsecure = view.findViewById(R.id.cbInsecure);
cbDane = view.findViewById(R.id.cbDane);
btnCheck = view.findViewById(R.id.btnCheck);
tvNetworkInfo = view.findViewById(R.id.tvNetworkInfo);
@ -545,12 +550,17 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
else
encryption = "none";
boolean insecure = cbInsecure.isChecked();
boolean dane = cbDane.isChecked();
int timeout = prefs.getInt("timeout", EmailService.DEFAULT_CONNECT_TIMEOUT) * 1000;
Bundle args = new Bundle();
args.putString("host", host);
args.putInt("port", port == null ? 0 : port);
args.putString("encryption", encryption);
args.putBoolean("insecure", insecure);
args.getBoolean("dane", dane);
args.putInt("timeout", timeout);
new SimpleTask<StringBuilder>() {
@ -569,17 +579,30 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
String host = args.getString("host");
int port = args.getInt("port");
String encryption = args.getString("encryption");
boolean insecure = args.getBoolean("insecure");
boolean dane = args.getBoolean("dane");
int timeout = args.getInt("timeout");
boolean ssl_harden = prefs.getBoolean("ssl_harden", false);
boolean ssl_harden_strict = prefs.getBoolean("ssl_harden_strict", false);
boolean cert_strict = prefs.getBoolean("cert_strict", true);
boolean cert_transparency = prefs.getBoolean("cert_transparency", false);
boolean check_names = prefs.getBoolean("check_names", !BuildConfig.PLAY_STORE_RELEASE);
boolean bc = prefs.getBoolean("bouncy_castle", false);
boolean fips = prefs.getBoolean("bc_fips", false);
StringBuilder sb = new StringBuilder();
sb.append("Host: ").append(host).append('\n');
sb.append("Port: ").append(port).append('\n');
sb.append("Encryption: ").append(encryption).append('\n');
InetSocketAddress address = new InetSocketAddress(host, port);
SSLSocketFactory sslFactory = new EmailService.SSLSocketFactoryService(
context, host, port, insecure, dane,
ssl_harden, ssl_harden_strict, cert_strict, cert_transparency, check_names,
bc, fips, null, null, null);
SocketFactory factory = (!"ssl".equals(encryption)
? SocketFactory.getDefault()
: SSLSocketFactory.getDefault());
? SocketFactory.getDefault() : sslFactory);
try (Socket socket = factory.createSocket()) {
socket.connect(address, timeout);
socket.setSoTimeout(timeout);
@ -588,7 +611,7 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
SSLSocket sslSocket = null;
try {
if ("starttls".equals(encryption))
sslSocket = ConnectionHelper.starttls(socket, host, port, context);
sslSocket = ConnectionHelper.starttls(sslFactory, socket, host, port, context);
else
sslSocket = (SSLSocket) socket;

22
app/src/main/res/layout/fragment_options_connection.xml
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@ -917,6 +917,26 @@
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/tvPort" />
<CheckBox
android:id="@+id/cbInsecure"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:text="@string/title_allow_insecure"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/etPort" />
<CheckBox
android:id="@+id/cbDane"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:text="@string/title_dane"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/cbInsecure" />
<Button
android:id="@+id/btnCheck"
style="?android:attr/buttonStyleSmall"
@ -925,7 +945,7 @@
android:layout_marginTop="12dp"
android:text="@string/title_check"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/etPort" />
app:layout_constraintTop_toBottomOf="@id/cbDane" />
<TextView
android:id="@+id/tvNetworkInfo"

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