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Remove removal of cryptography restrictions

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This is no longer needed as of Java 9
This commit is contained in:
P0nk
2021-09-09 20:37:53 +02:00
parent 9df2758ae6
commit eb2f464826
2 changed files with 0 additions and 65 deletions
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4
src/main/java/net/server/Server.java
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@@ -62,12 +62,10 @@ import server.TimerManager;
import server.expeditions.MapleExpeditionBossLog;
import server.life.MaplePlayerNPCFactory;
import server.quest.MapleQuest;
import tools.AutoJCE;
import tools.DatabaseConnection;
import tools.FilePrinter;
import tools.Pair;
import java.security.Security;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
@@ -958,8 +956,6 @@ public class Server {
}
public static void main(String[] args) {
Security.setProperty("crypto.policy", "unlimited");
AutoJCE.removeCryptographyRestrictions();
Server.getInstance().init();
}

61
src/main/java/tools/AutoJCE.java
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@@ -1,61 +0,0 @@
package tools;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.security.Permission;
import java.security.PermissionCollection;
import java.util.Map;
public class AutoJCE{ // AutoJCE into server source thanks to Acernis dev team
/**
* Credits: ntoskrnl of StackOverflow
* http://stackoverflow.com/questions/1179672/
*/
public static byte removeCryptographyRestrictions(){
if(!isRestrictedCryptography()){
//System.out.println("Cryptography restrictions removal not needed");
return 0;
}
try{
/*
* Do the following, but with reflection to bypass access checks:
*
* JceSecurity.isRestricted = false;
* JceSecurity.defaultPolicy.perms.clear();
* JceSecurity.defaultPolicy.add(CryptoAllPermission.INSTANCE);
*/
final Class<?> jceSecurity = Class.forName("javax.crypto.JceSecurity");
final Class<?> cryptoPermissions = Class.forName("javax.crypto.CryptoPermissions");
final Class<?> cryptoAllPermission = Class.forName("javax.crypto.CryptoAllPermission");
final Field isRestrictedField = jceSecurity.getDeclaredField("isRestricted");// was set to final in Java 8 Update 112. Requires you to remove the final modifier.
Field modifiersField = Field.class.getDeclaredField("modifiers");
modifiersField.setAccessible(true);
modifiersField.setInt(isRestrictedField, isRestrictedField.getModifiers() & ~Modifier.FINAL);
isRestrictedField.setAccessible(true);
isRestrictedField.set(null, false);
final Field defaultPolicyField = jceSecurity.getDeclaredField("defaultPolicy");
defaultPolicyField.setAccessible(true);
final PermissionCollection defaultPolicy = (PermissionCollection) defaultPolicyField.get(null);
final Field perms = cryptoPermissions.getDeclaredField("perms");
perms.setAccessible(true);
((Map<?, ?>) perms.get(defaultPolicy)).clear();
final Field instance = cryptoAllPermission.getDeclaredField("INSTANCE");
instance.setAccessible(true);
defaultPolicy.add((Permission) instance.get(null));
//System.out.println("Successfully removed cryptography restrictions");
return 1;
}catch(final Exception e){
e.printStackTrace();
System.err.println("Failed to remove cryptography restrictions");
return -1;
}
}
private static boolean isRestrictedCryptography(){
// This simply matches the Oracle JRE, but not OpenJDK.
return "Java(TM) SE Runtime Environment".equals(System.getProperty("java.runtime.name"));
}
}