From f065c0a5be4fa004f7222948a4af0718174f7ab8 Mon Sep 17 00:00:00 2001
From: Claude <developers@lethean.io>
Date: Tue, 17 Feb 2026 20:54:02 +0000
Subject: [PATCH] feat(coredeno): permission engine for I/O fortress

CheckPath (prefix-based), CheckNet (exact match), CheckRun (exact match).
Empty allowed list = deny all. Secure by default.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 pkg/coredeno/permissions.go      | 42 ++++++++++++++++++++++++++++++++
 pkg/coredeno/permissions_test.go | 40 ++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 pkg/coredeno/permissions.go
 create mode 100644 pkg/coredeno/permissions_test.go

diff --git a/pkg/coredeno/permissions.go b/pkg/coredeno/permissions.go
new file mode 100644
index 0000000..aa8863c
--- /dev/null
+++ b/pkg/coredeno/permissions.go
@@ -0,0 +1,42 @@
+package coredeno
+
+import (
+	"path/filepath"
+	"strings"
+)
+
+// CheckPath returns true if the given path is under any of the allowed prefixes.
+// Empty allowed list means deny all (secure by default).
+func CheckPath(path string, allowed []string) bool {
+	if len(allowed) == 0 {
+		return false
+	}
+	clean := filepath.Clean(path)
+	for _, prefix := range allowed {
+		cleanPrefix := filepath.Clean(prefix)
+		if strings.HasPrefix(clean, cleanPrefix) {
+			return true
+		}
+	}
+	return false
+}
+
+// CheckNet returns true if the given host:port is in the allowed list.
+func CheckNet(addr string, allowed []string) bool {
+	for _, a := range allowed {
+		if a == addr {
+			return true
+		}
+	}
+	return false
+}
+
+// CheckRun returns true if the given command is in the allowed list.
+func CheckRun(cmd string, allowed []string) bool {
+	for _, a := range allowed {
+		if a == cmd {
+			return true
+		}
+	}
+	return false
+}
diff --git a/pkg/coredeno/permissions_test.go b/pkg/coredeno/permissions_test.go
new file mode 100644
index 0000000..20dd060
--- /dev/null
+++ b/pkg/coredeno/permissions_test.go
@@ -0,0 +1,40 @@
+package coredeno
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCheckPath_Good_Allowed(t *testing.T) {
+	allowed := []string{"./data/", "./config/"}
+	assert.True(t, CheckPath("./data/file.txt", allowed))
+	assert.True(t, CheckPath("./config/app.json", allowed))
+}
+
+func TestCheckPath_Bad_Denied(t *testing.T) {
+	allowed := []string{"./data/"}
+	assert.False(t, CheckPath("./secrets/key.pem", allowed))
+	assert.False(t, CheckPath("../escape/file", allowed))
+}
+
+func TestCheckPath_Good_EmptyDenyAll(t *testing.T) {
+	assert.False(t, CheckPath("./anything", nil))
+	assert.False(t, CheckPath("./anything", []string{}))
+}
+
+func TestCheckNet_Good_Allowed(t *testing.T) {
+	allowed := []string{"pool.lthn.io:3333", "api.lthn.io:443"}
+	assert.True(t, CheckNet("pool.lthn.io:3333", allowed))
+}
+
+func TestCheckNet_Bad_Denied(t *testing.T) {
+	allowed := []string{"pool.lthn.io:3333"}
+	assert.False(t, CheckNet("evil.com:80", allowed))
+}
+
+func TestCheckRun_Good(t *testing.T) {
+	allowed := []string{"xmrig", "sha256sum"}
+	assert.True(t, CheckRun("xmrig", allowed))
+	assert.False(t, CheckRun("rm", allowed))
+}