Agent-System-Backend/internal/tools/fs_test.go

// fs 工具族测试：沙箱隔离 / 路径穿越负例 / 大小上限 / Hidden 门禁 / 工件登记不变式。
package tools

import (
	"encoding/json"
	"os"
	"path/filepath"
	"strings"
	"testing"

	core "agent-system-core"
)

type fakeFSCtx struct {
	root        string
	owner       string
	conv        string
	fsToolsOn   bool
	written     []string // 登记的工件名
	lastContent []byte   // 最近一次写入的工件字节
	lastMime    string
}

func (c *fakeFSCtx) ProjectID() string      { return "p1" }
func (c *fakeFSCtx) ConversationID() string { return c.conv }
func (c *fakeFSCtx) OwnerID() string        { return c.owner }
func (c *fakeFSCtx) WorkspaceRoot() string  { return c.root }
func (c *fakeFSCtx) SettingBool(key string, def bool) bool {
	if key == "runtime.fsTools" {
		return c.fsToolsOn
	}
	return def
}
func (c *fakeFSCtx) Retrieve(q core.RetrievalQuery) ([]core.RetrievalHit, error) { return nil, nil }
func (c *fakeFSCtx) WriteArtifact(name, kind, mime string, content []byte) (core.Artifact, error) {
	c.written = append(c.written, name)
	c.lastContent = content
	c.lastMime = mime
	return core.Artifact{ID: "art_" + name, Name: name, Kind: kind, MIME: mime, Size: int64(len(content))}, nil
}
func (c *fakeFSCtx) PeerConversations() ([]core.Conversation, error)              { return nil, nil }
func (c *fakeFSCtx) PeerConversationMessages(string, int) ([]core.Message, error) { return nil, nil }

func newFSRegistry(t *testing.T) *Registry {
	t.Helper()
	r := NewRegistry()
	if err := r.RegisterBuiltin(); err != nil {
		t.Fatal(err)
	}
	if err := RegisterFSTools(r); err != nil {
		t.Fatal(err)
	}
	return r
}

func call(t *testing.T, r *Registry, rc *fakeFSCtx, name, args string) core.ToolCallResult {
	t.Helper()
	return r.Execute(rc, core.ToolCallRequest{CallID: "c1", Name: name, Arguments: json.RawMessage(args)})
}

func TestFSToolsHiddenAndGated(t *testing.T) {
	r := newFSRegistry(t)
	// 可见性：Hidden 工具不在 List()（List 本身不过滤——过滤在 server/runmgr 层），
	// 但描述带 Hidden 标记。
	for _, d := range r.List() {
		if strings.HasPrefix(d.Name, "fs_") && !d.Hidden {
			t.Errorf("%s should be Hidden", d.Name)
		}
	}
	// 执行门禁：runtime.fsTools 关闭时 fail-closed。
	rc := &fakeFSCtx{root: t.TempDir(), owner: "o1", conv: "c1", fsToolsOn: false}
	res := call(t, r, rc, "fs_write_file", `{"path":"a.md","content":"x"}`)
	if res.Status != "error" || !strings.Contains(res.Output, "reserved capability") {
		t.Errorf("gate off should reject, got %s %s", res.Status, res.Output)
	}
}

func TestFSWriteReadListRoundtrip(t *testing.T) {
	r := newFSRegistry(t)
	root := t.TempDir()
	rc := &fakeFSCtx{root: root, owner: "o1", conv: "c1", fsToolsOn: true}
	res := call(t, r, rc, "fs_write_file", `{"path":"notes/纪要.md","content":"# 会议纪要\n内容"}`)
	if res.Status != "ok" {
		t.Fatalf("write failed: %s", res.Output)
	}
	// 不变式：写文件同步登记工件。
	if len(rc.written) != 1 || rc.written[0] != "纪要.md" {
		t.Errorf("artifact registration missing: %v", rc.written)
	}
	// 落盘位置在会话沙箱内。
	if _, err := os.Stat(filepath.Join(root, "o1", "c1", "notes", "纪要.md")); err != nil {
		t.Fatalf("sandbox file missing: %v", err)
	}
	res = call(t, r, rc, "fs_read_file", `{"path":"notes/纪要.md"}`)
	if res.Status != "ok" || !strings.Contains(res.Output, "会议纪要") {
		t.Fatalf("read failed: %s %s", res.Status, res.Output)
	}
	res = call(t, r, rc, "fs_list_dir", `{}`)
	if res.Status != "ok" || !strings.Contains(res.Output, "notes") {
		t.Fatalf("list failed: %s %s", res.Status, res.Output)
	}
}

func TestFSPathTraversalRejected(t *testing.T) {
	r := newFSRegistry(t)
	root := t.TempDir()
	if err := os.MkdirAll(filepath.Join(root, "outside"), 0o755); err != nil {
		t.Fatal(err)
	}
	rc := &fakeFSCtx{root: root, owner: "o1", conv: "c1", fsToolsOn: true}
	negatives := []string{
		`{"path":"../escape.md","content":"x"}`,
		`{"path":"..\\..\\escape.md","content":"x"}`,
		`{"path":"/etc/passwd","content":"x"}`,
		`{"path":"a/../../escape.md","content":"x"}`,
		`{"path":"a/../../../o2/c2/steal.md","content":"x"}`,
	}
	for _, args := range negatives {
		if res := call(t, r, rc, "fs_write_file", args); res.Status != "error" {
			t.Errorf("traversal write should fail: %s -> %s", args, res.Output)
		}
	}
	// 读穿越同样拒绝。
	if res := call(t, r, rc, "fs_read_file", `{"path":"../../secret"}`); res.Status != "error" {
		t.Errorf("traversal read should fail: %s", res.Output)
	}
	// 符号链接逃逸：沙箱内软链指向根外，拒绝覆写。
	outside := filepath.Join(root, "outside", "target.txt")
	os.WriteFile(outside, []byte("keep"), 0o644)
	link := filepath.Join(root, "o1", "c1", "link.md")
	os.MkdirAll(filepath.Dir(link), 0o755)
	os.Symlink(outside, link)
	if res := call(t, r, rc, "fs_write_file", `{"path":"link.md","content":"pwn"}`); res.Status != "error" {
		t.Errorf("symlink escape should fail: %s", res.Output)
	}
	if b, _ := os.ReadFile(outside); string(b) != "keep" {
		t.Errorf("outside file was modified via symlink")
	}
}

func TestFSSizeLimits(t *testing.T) {
	r := newFSRegistry(t)
	rc := &fakeFSCtx{root: t.TempDir(), owner: "o1", conv: "c1", fsToolsOn: true}
	big := strings.Repeat("a", fsMaxWrite+1)
	args, _ := json.Marshal(map[string]string{"path": "big.txt", "content": big})
	if res := call(t, r, rc, "fs_write_file", string(args)); res.Status != "error" {
		t.Errorf("oversize write should fail")
	}
	// 读上限：直接写一个大文件进沙箱再读。
	os.MkdirAll(filepath.Join(rc.root, "o1", "c1"), 0o755)
	os.WriteFile(filepath.Join(rc.root, "o1", "c1", "big.bin"), make([]byte, fsMaxRead+1), 0o644)
	if res := call(t, r, rc, "fs_read_file", `{"path":"big.bin"}`); res.Status != "error" {
		t.Errorf("oversize read should fail")
	}
}

func TestFSUnconfiguredRoot(t *testing.T) {
	r := newFSRegistry(t)
	rc := &fakeFSCtx{root: "", owner: "o1", conv: "c1", fsToolsOn: true}
	if res := call(t, r, rc, "fs_list_dir", `{}`); res.Status != "error" {
		t.Errorf("unconfigured root should fail: %s", res.Output)
	}
}