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FairEmail
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Code Issues Projects Releases Wiki Activity

Added options for custom resolver and enforcing DNSSEC

Browse Source
pull/214/head
M66B 12 months ago
parent 9f1d809c79
commit bd8fceca35
5 changed files with 77 additions and 13 deletions
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31
app/src/main/java/eu/faircode/email/DnsHelper.java
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@ -90,7 +90,7 @@ public class DnsHelper {
String domain = UriHelper.getEmailDomain(email);
if (domain == null)
continue;
DnsRecord[] records = _lookup(context, domain, "mx", CHECK_TIMEOUT, false);
DnsRecord[] records = _lookup(context, domain, "mx", CHECK_TIMEOUT);
if (records.length == 0)
throw new UnknownHostException(domain);
}
@ -98,12 +98,14 @@ public class DnsHelper {
@NonNull
static DnsRecord[] lookup(Context context, String name, String type) {
return _lookup(context, name, type, LOOKUP_TIMEOUT, false);
return _lookup(context, name, type, LOOKUP_TIMEOUT);
}
@NonNull
private static DnsRecord[] _lookup(
Context context, String name, String type, int timeout, boolean require_authentic) {
private static DnsRecord[] _lookup(Context context, String name, String type, int timeout) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
boolean dns_secure = prefs.getBoolean("dns_secure", false);
String filter = null;
int colon = type.indexOf(':');
if (colon > 0) {
@ -234,7 +236,7 @@ public class DnsHelper {
data.throwIfErrorResponse();
boolean secure = (data.getUnverifiedReasons() != null);
if (secure && require_authentic) {
if (secure && dns_secure) {
DnssecResultNotAuthenticException ex = data.getDnssecResultNotAuthenticException();
if (ex != null)
throw ex;
@ -321,8 +323,9 @@ public class DnsHelper {
return result.toArray(new DnsRecord[0]);
} catch (Throwable ex) {
if (ex instanceof DnssecValidationFailedException ||
ex instanceof MultipleIoException)
if (ex instanceof MultipleIoException ||
ex instanceof DnssecValidationFailedException ||
ex instanceof DnssecResultNotAuthenticException)
Log.i(ex);
else
Log.e(ex);
@ -332,7 +335,7 @@ public class DnsHelper {
static InetAddress getByName(Context context, String host) throws UnknownHostException {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
boolean dns_custom = prefs.getBoolean("dns_custom", BuildConfig.DEBUG);
boolean dns_custom = prefs.getBoolean("dns_custom", false);
if (!dns_custom)
return InetAddress.getByName(host);
@ -341,12 +344,11 @@ public class DnsHelper {
return InetAddress.getByName(host);
return getAllByName(context, host)[0];
}
static InetAddress[] getAllByName(Context context, String host) throws UnknownHostException {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
boolean dns_custom = prefs.getBoolean("dns_custom", BuildConfig.DEBUG);
boolean dns_custom = prefs.getBoolean("dns_custom", false);
if (!dns_custom)
return InetAddress.getAllByName(host);
@ -436,6 +438,15 @@ public class DnsHelper {
return result;
}
static void clear(Context context) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
SharedPreferences.Editor editor = prefs.edit();
for (String key : prefs.getAll().keySet())
if (key != null && key.startsWith("dns."))
editor.remove(key);
editor.apply();
}
static void test(Context context) throws UnknownHostException {
test(context, "gmail.com", "ns");
test(context, "web.de", "mx");

28
app/src/main/java/eu/faircode/email/FragmentOptionsConnection.java
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@ -95,6 +95,8 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
private SwitchCompat swBindSocket;
private SwitchCompat swStandaloneVpn;
private EditText etDns;
private SwitchCompat swDnsCustom;
private SwitchCompat swDnsSecure;
private SwitchCompat swTcpKeepAlive;
private SwitchCompat swSslUpdate;
private SwitchCompat swSslHarden;
@ -126,7 +128,9 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
"metered", "download", "download_limited", "roaming", "rlah",
"download_headers", "download_eml", "download_plain",
"require_validated", "require_validated_captive", "vpn_only",
"timeout", "prefer_ip4", "bind_socket", "standalone_vpn", "dns_extra", "tcp_keep_alive",
"timeout", "prefer_ip4", "bind_socket", "standalone_vpn",
"dns_extra", "dns_custom", "dns_secure",
"tcp_keep_alive",
"ssl_update", "ssl_harden", "ssl_harden_strict", "cert_strict", "cert_transparency", "check_names",
"open_safe", "http_redirect",
"bouncy_castle", "bc_fips"
@ -159,6 +163,8 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
swBindSocket = view.findViewById(R.id.swBindSocket);
swStandaloneVpn = view.findViewById(R.id.swStandaloneVpn);
etDns = view.findViewById(R.id.etDns);
swDnsCustom = view.findViewById(R.id.swDnsCustom);
swDnsSecure = view.findViewById(R.id.swDnsSecure);
swTcpKeepAlive = view.findViewById(R.id.swTcpKeepAlive);
swSslUpdate = view.findViewById(R.id.swSslUpdate);
swSslHarden = view.findViewById(R.id.swSslHarden);
@ -354,6 +360,23 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
}
});
swDnsCustom.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean checked) {
DnsHelper.clear(buttonView.getContext());
prefs.edit().putBoolean("dns_custom", checked).apply();
swDnsSecure.setEnabled(checked);
}
});
swDnsSecure.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean checked) {
DnsHelper.clear(buttonView.getContext());
prefs.edit().putBoolean("dns_secure", checked).apply();
}
});
swTcpKeepAlive.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
@ -736,6 +759,9 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
swBindSocket.setChecked(prefs.getBoolean("bind_socket", false));
swStandaloneVpn.setChecked(prefs.getBoolean("standalone_vpn", false));
etDns.setText(prefs.getString("dns_extra", null));
swDnsCustom.setChecked(prefs.getBoolean("dns_custom", false));
swDnsSecure.setChecked(prefs.getBoolean("dns_secure", false));
swDnsSecure.setEnabled(swDnsCustom.isChecked());
swTcpKeepAlive.setChecked(prefs.getBoolean("tcp_keep_alive", false));
swSslUpdate.setChecked(prefs.getBoolean("ssl_update", true));
swSslHarden.setChecked(prefs.getBoolean("ssl_harden", false));

4
app/src/main/java/eu/faircode/email/ServiceSynchronize.java
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@ -171,7 +171,9 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
"sync_folders",
"sync_shared_folders",
"download_headers", "download_eml",
"prefer_ip4", "bind_socket", "standalone_vpn", "tcp_keep_alive", // force reconnect
"prefer_ip4", "bind_socket", "standalone_vpn", // force reconnect
"dns_extra", "dns_custom", "dns_secure", // force reconnect
"tcp_keep_alive", // force reconnect
"ssl_harden", "ssl_harden_strict", "cert_strict", "cert_transparency", "check_names", "bouncy_castle", "bc_fips", // force reconnect
"experiments", "debug", "protocol", // force reconnect
"auth_plain", "auth_login", "auth_ntlm", "auth_sasl", "auth_apop", // force reconnect

25
app/src/main/res/layout/fragment_options_connection.xml
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@ -448,6 +448,29 @@
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/tvDns" />
<androidx.appcompat.widget.SwitchCompat
android:id="@+id/swDnsCustom"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:text="@string/title_advanced_dns_custom"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/etDns"
app:switchPadding="12dp" />
<androidx.appcompat.widget.SwitchCompat
android:id="@+id/swDnsSecure"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginTop="12dp"
android:text="@string/title_advanced_dns_secure"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/swDnsCustom"
app:switchPadding="12dp" />
<androidx.appcompat.widget.SwitchCompat
android:id="@+id/swTcpKeepAlive"
android:layout_width="0dp"
@ -457,7 +480,7 @@
android:text="@string/title_advanced_tcp_keep_alive"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/etDns"
app:layout_constraintTop_toBottomOf="@id/swDnsSecure"
app:switchPadding="12dp" />
<TextView

2
app/src/main/res/values/strings.xml
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@ -518,6 +518,8 @@
<string name="title_advanced_bind_socket" translatable="false">Bind sockets to the active network</string>
<string name="title_advanced_standalone_vpn" translatable="false">Standalone VPN</string>
<string name="title_advanced_dns">Additional DNS server addresses (comma separated)</string>
<string name="title_advanced_dns_custom">Use custom DNS resolver</string>
<string name="title_advanced_dns_secure">Enforce DNSSEC</string>
<string name="title_advanced_tcp_keep_alive" translatable="false">TCP keep alive</string>
<string name="title_advanced_ssl_update">Use updated SSL provider</string>
<string name="title_advanced_ssl_harden">Harden SSL connections</string>

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