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92 changes: 92 additions & 0 deletions
92
src/main/java/com/cleanroommc/groovyscript/sandbox/security/SandboxSecurityManager.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| package com.cleanroommc.groovyscript.sandbox.security; | ||
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| import com.cleanroommc.groovyscript.GroovyScript; | ||
| import sun.misc.Unsafe; | ||
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| import java.io.FilePermission; | ||
| import java.lang.reflect.Field; | ||
| import java.lang.reflect.Method; | ||
| import java.security.Permission; | ||
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| public class SandboxSecurityManager extends SecurityManager { | ||
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| private static final Object securityFieldBase; | ||
| private static final long securityFieldOffset; | ||
| private static final Unsafe UNSAFE; | ||
| private final SecurityManager parent; | ||
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| // cursed | ||
| static { | ||
| Object base = null; | ||
| long offset = 0; | ||
| Unsafe unsafe; | ||
| try { | ||
| Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe"); | ||
| unsafeField.setAccessible(true); | ||
| unsafe = (Unsafe) unsafeField.get(null); | ||
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| Method getFields = Class.class.getDeclaredMethod("getDeclaredFields0", boolean.class); | ||
| getFields.setAccessible(true); | ||
| for (Field field : (Field[]) getFields.invoke(System.class, false)) { | ||
| if (field.getName().equals("security")) { | ||
| offset = unsafe.staticFieldOffset(field); | ||
| base = unsafe.staticFieldBase(field); | ||
| break; | ||
| } | ||
| } | ||
| } catch (Throwable e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| securityFieldBase = base; | ||
| securityFieldOffset = offset; | ||
| UNSAFE = unsafe; | ||
| } | ||
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| public SandboxSecurityManager() { | ||
| this.parent = System.getSecurityManager(); | ||
| if (this.parent == null) { | ||
| throw new NullPointerException(); | ||
| } | ||
| } | ||
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| public void install() { | ||
| UNSAFE.putObject(securityFieldBase, securityFieldOffset, this); | ||
| } | ||
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| public void uninstall() { | ||
| System.setSecurityManager(this.parent); | ||
| } | ||
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| public void checkFile(Permission perm) { | ||
| if (perm instanceof FilePermission filePerm) { | ||
| String path = filePerm.getName(); | ||
| Class<?>[] classContext = getClassContext(); | ||
| if (!path.startsWith(GroovyScript.getMinecraftHome().getPath())) { | ||
| for (Class<?> clazz : classContext) { | ||
| if (ClassLoader.class.isAssignableFrom(clazz)) { | ||
| // allow loading classes | ||
| return; | ||
| } | ||
| } | ||
| throw new SecurityException("Only files in minecraft home and sub directories can be accessed from scripts! Tried to access " + perm.getName()); | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public Object getSecurityContext() { | ||
| return parent.getSecurityContext(); | ||
| } | ||
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| @Override | ||
| public void checkPermission(Permission perm) { | ||
| parent.checkPermission(perm); | ||
| checkFile(perm); | ||
| } | ||
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| @Override | ||
| public void checkPermission(Permission perm, Object context) { | ||
| parent.checkPermission(perm, context); | ||
| checkFile(perm); | ||
| } | ||
| } |
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