From a126d333e0d83d44d7306c3ddb9008c7e4df41c7 Mon Sep 17 00:00:00 2001
From: "kali kaneko (leap communications)" <kali@leap.se>
Date: Thu, 4 Jun 2020 16:25:04 +0200
Subject: [feat] pickled helpers ftw

Signed-off-by: kali kaneko (leap communications) <kali@leap.se>
---
 pkg/pickle/helpers.go | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 pkg/pickle/helpers.go

(limited to 'pkg/pickle/helpers.go')

diff --git a/pkg/pickle/helpers.go b/pkg/pickle/helpers.go
new file mode 100644
index 0000000..ec034d3
--- /dev/null
+++ b/pkg/pickle/helpers.go
@@ -0,0 +1,121 @@
+//go:generate statik -src=../../helpers -include=*
+
+// Copyright (C) 2020 LEAP
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package pickle
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"math/rand"
+	"os"
+	"os/exec"
+	"time"
+
+	_ "0xacab.org/leap/bitmask-vpn/pkg/pickle/statik"
+	"github.com/rakyll/statik/fs"
+)
+
+const (
+	bitmaskRoot = "/usr/sbin/bitmask-root"
+	// TODO parametrize this with config.appName
+	policyFile = "/usr/share/polkit-1/actions/se.leap.bitmask.riseupvpn.policy"
+)
+
+var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+func randSeq(n int) string {
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b)
+}
+
+func check(e error) {
+	if e != nil {
+		panic(e)
+	}
+}
+
+func alreadyThere(path string) bool {
+	if _, err := os.Stat(path); err == nil {
+		return true
+	}
+	return false
+}
+
+func copyAsRoot(orig, dest string, isExec bool) {
+	if alreadyThere(dest) {
+		fmt.Println("> File exists: ", dest)
+		return
+	}
+	var confirm string
+	fmt.Println("> About to write (as root):", dest)
+	fmt.Printf("> Continue? [y/N] ")
+	fmt.Scanln(&confirm)
+	if confirm != "y" {
+		fmt.Println("aborting")
+		os.Exit(1)
+	}
+	cmd := exec.Command("sudo", "cp", orig, dest)
+	err := cmd.Run()
+	check(err)
+
+	if isExec {
+		cmd = exec.Command("sudo", "chmod", "776", dest)
+		err = cmd.Run()
+		check(err)
+	}
+
+	fmt.Println("> done")
+}
+
+/* dumpHelper works in linux only at the moment.
+   TODO should separate implementations by platform */
+func dumpHelper(fname, dest string, isExec bool) {
+	stFS, err := fs.New()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	r, err := stFS.Open("/" + fname)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer r.Close()
+
+	c, err := ioutil.ReadAll(r)
+	if err != nil {
+		log.Fatal(err)
+	}
+	tmp := "/dev/shm/" + randSeq(14)
+
+	f, err := os.Create(tmp)
+	check(err)
+	defer os.Remove(tmp)
+
+	_, err = f.Write(c)
+	check(err)
+	copyAsRoot(tmp, dest, isExec)
+}
+
+func InstallHelpers() {
+	rand.Seed(time.Now().UnixNano())
+	dumpHelper("bitmask-root", bitmaskRoot, true)
+	dumpHelper("se.leap.bitmask.policy", policyFile, false)
+}
-- 
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