diff options
Diffstat (limited to 'pkg')
| -rw-r--r-- | pkg/helper/args.go | 103 | ||||
| -rw-r--r-- | pkg/helper/darwin.go | 184 | ||||
| -rw-r--r-- | pkg/helper/helper.go | 139 | ||||
| -rw-r--r-- | pkg/helper/linux.go | 67 | ||||
| -rw-r--r-- | pkg/helper/windows.go | 66 |
5 files changed, 559 insertions, 0 deletions
diff --git a/pkg/helper/args.go b/pkg/helper/args.go new file mode 100644 index 0000000..d6b3bb4 --- /dev/null +++ b/pkg/helper/args.go @@ -0,0 +1,103 @@ +package helper + +import ( + "log" + "net" + "os" + "regexp" + "strconv" +) + +const ( + // TODO: this is the nameserver for tcp, but for udp is 10.42.0.1 + // the nameserver pick up should be dependent on the proto being used + nameserver = "10.41.0.1" +) + +var ( + fixedArgs = []string{ + "--nobind", + "--client", + "--dev", "tun", + "--tls-client", + "--remote-cert-tls", "server", + "--dhcp-option", "DNS", nameserver, + "--log", LogFolder + "openvpn.log", + } + + allowendArgs = map[string][]string{ + "--remote": []string{"IP", "NUMBER", "PROTO"}, + "--tls-cipher": []string{"CIPHER"}, + "--cipher": []string{"CIPHER"}, + "--auth": []string{"CIPHER"}, + "--management-client": []string{}, + "--management": []string{"IP", "NUMBER"}, + "--cert": []string{"FILE"}, + "--key": []string{"FILE"}, + "--ca": []string{"FILE"}, + "--fragment": []string{"NUMBER"}, + "--keepalive": []string{"NUMBER", "NUMBER"}, + "--verb": []string{"NUMBER"}, + "--tun-ipv6": []string{}, + } + + cipher = regexp.MustCompile("^[A-Z0-9-]+$") + formats = map[string]func(s string) bool{ + "NUMBER": isNumber, + "PROTO": isProto, + "IP": isIP, + "CIPHER": cipher.MatchString, + "FILE": isFile, + } +) + +func parseOpenvpnArgs(args []string) []string { + newArgs := fixedArgs + newArgs = append(newArgs, platformOpenvpnFlags...) + for i := 0; i < len(args); i++ { + params, ok := allowendArgs[args[i]] + if !ok { + log.Printf("Invalid openvpn arg: %s", args[i]) + continue + } + for j, arg := range args[i+1 : i+len(params)+1] { + if !formats[params[j]](arg) { + ok = false + break + } + } + if ok { + newArgs = append(newArgs, args[i:i+len(params)+1]...) + i = i + len(params) + } else { + log.Printf("Invalid openvpn arg params: %v", args[i:i+len(params)+1]) + } + } + return newArgs +} + +func isNumber(s string) bool { + _, err := strconv.Atoi(s) + return err == nil +} + +func isProto(s string) bool { + for _, proto := range []string{"tcp", "udp", "tcp4", "udp4", "tcp6", "udp6"} { + if s == proto { + return true + } + } + return false +} + +func isIP(s string) bool { + return net.ParseIP(s) != nil +} + +func isFile(s string) bool { + info, err := os.Stat(s) + if err != nil { + return false + } + return !info.IsDir() +} diff --git a/pkg/helper/darwin.go b/pkg/helper/darwin.go new file mode 100644 index 0000000..7261de8 --- /dev/null +++ b/pkg/helper/darwin.go @@ -0,0 +1,184 @@ +// +build darwin +// Copyright (C) 2018 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/>. + +/* + +This module holds some specific constants for osx, and it also contains the implementation of the pf firewall. + +To inspect the rules in the firewall manually, use the bitmask anchor: + + sudo pfctl -s rules -a com.apple/250.BitmaskFirewall + +*/ + +package helper + +import ( + "bytes" + "errors" + "fmt" + "log" + "os" + "os/exec" + "path" + "strings" + + "github.com/sevlyar/go-daemon" +) + +const ( + appPath = "/Applications/RiseupVPN.app/" + helperPath = appPath + "Contents/helper/" + LogFolder = helperPath + openvpnPath = appPath + "Contents/Resources/openvpn.leap" + + rulefilePath = helperPath + "bitmask.pf.conf" + bitmask_anchor = "com.apple/250.BitmaskFirewall" + gateways_table = "bitmask_gateways" + + pfctl = "/sbin/pfctl" +) + +var ( + platformOpenvpnFlags = []string{ + "--script-security", "2", + "--up", helperPath + "client.up.sh", + "--down", helperPath + "client.down.sh", + } +) + +func daemonize() { + cntxt := &daemon.Context{ + PidFileName: "pid", + PidFilePerm: 0644, + LogFileName: "bitmask-helper.log", + LogFilePerm: 0640, + WorkDir: "./", + Umask: 027, + Args: []string{"[bitmask-helper]"}, + } + + d, err := cntxt.Reborn() + if err != nil { + log.Fatal("Unable to run: ", err) + } + if d != nil { + return + } + defer cntxt.Release() + log.Print("bitmask-helper daemon started") +} + +func getOpenvpnPath() string { + return openvpnPath +} + +func kill(cmd *exec.Cmd) error { + return cmd.Process.Signal(os.Interrupt) +} + +func firewallStart(gateways []string) error { + enablePf() + err := resetGatewaysTable(gateways) + if err != nil { + return err + } + + return loadBitmaskAnchor() +} + +func firewallStop() error { + return exec.Command(pfctl, "-a", bitmask_anchor, "-F", "all").Run() +} + +func firewallIsUp() bool { + out, err := exec.Command(pfctl, "-a", bitmask_anchor, "-sr").Output() + if err != nil { + log.Printf("An error ocurred getting the status of the firewall: %v", err) + return false + } + return bytes.Contains(out, []byte("block out proto udp to any port 53")) +} + +func enablePf() { + cmd := exec.Command(pfctl, "-e") + cmd.Run() +} + +func resetGatewaysTable(gateways []string) error { + log.Println("Resetting gateways") + cmd := exec.Command(pfctl, "-a", bitmask_anchor, "-t", gateways_table, "-T", "delete") + err := cmd.Run() + if err != nil { + log.Printf("Can't delete table: %v", err) + } + + for _, gateway := range gateways { + log.Println("Adding Gateway:", gateway) + cmd = exec.Command(pfctl, "-a", bitmask_anchor, "-t", gateways_table, "-T", "add", gateway) + err = cmd.Run() + if err != nil { + log.Printf("Error adding gateway to table: %v", err) + } + } + + cmd = exec.Command(pfctl, "-a", bitmask_anchor, "-t", gateways_table, "-T", "add", nameserver) + return cmd.Run() + +} + +func getDefaultDevice() string { + out, err := exec.Command("/bin/sh", "-c", "/sbin/route -n get -net default | /usr/bin/grep interface | /usr/bin/awk '{print $2}'").Output() + if err != nil { + log.Printf("Error getting default device") + } + return strings.TrimSpace(bytesToString(out)) +} + +func loadBitmaskAnchor() error { + dev := getDefaultDevice() + rulePath, err := getRulefilePath() + if err != nil { + return err + } + cmdline := fmt.Sprintf("%s -D default_device=%s -a %s -f %s", pfctl, dev, bitmask_anchor, rulePath) + + log.Println("Loading Bitmask Anchor:", cmdline) + + _, err = exec.Command("/bin/sh", "-c", cmdline).Output() + return err +} + +func getRulefilePath() (string, error) { + if _, err := os.Stat(rulefilePath); !os.IsNotExist(err) { + return rulefilePath, nil + } + + gopath := os.Getenv("GOPATH") + if gopath == "" { + gopath = path.Join(os.Getenv("HOME"), "go") + } + rulefile := path.Join(gopath, "0xacab.org", "leap", "riseup_vpn", "osx", "bitmask.pf.conf") + + if _, err := os.Stat(rulefile); !os.IsNotExist(err) { + return rulefile, nil + } + return "", errors.New("Can't find rule file for the firewall") +} + +func bytesToString(data []byte) string { + return string(data[:]) +} diff --git a/pkg/helper/helper.go b/pkg/helper/helper.go new file mode 100644 index 0000000..2e7ffd1 --- /dev/null +++ b/pkg/helper/helper.go @@ -0,0 +1,139 @@ +// Copyright (C) 2018 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 helper + +import ( + "encoding/json" + "log" + "net/http" + "os/exec" +) + +type openvpnT struct { + cmd *exec.Cmd +} + +func ServeHTTP(bindAddr string) { + daemonize() + openvpn := openvpnT{nil} + http.HandleFunc("/openvpn/start", openvpn.start) + http.HandleFunc("/openvpn/stop", openvpn.stop) + http.HandleFunc("/firewall/start", firewallStartHandler) + http.HandleFunc("/firewall/stop", firewallStopHandler) + http.HandleFunc("/firewall/isup", firewallIsUpHandler) + + log.Fatal(http.ListenAndServe(bindAddr, nil)) +} + +func (openvpn *openvpnT) start(w http.ResponseWriter, r *http.Request) { + args, err := getArgs(r) + if err != nil { + log.Printf("An error has occurred processing flags: %v", err) + w.Write([]byte(err.Error())) + return + } + + args = parseOpenvpnArgs(args) + log.Printf("start openvpn: %v", args) + err = openvpn.run(args) + if err != nil { + log.Printf("Error starting openvpn: %v", err) + w.Write([]byte(err.Error())) + } +} + +func (openvpn *openvpnT) run(args []string) error { + if openvpn.cmd != nil { + log.Printf("openvpn was running, stop it first") + err := openvpn.kill() + if err != nil { + return err + } + } + + // TODO: if it dies we should restart it + openvpn.cmd = exec.Command(getOpenvpnPath(), args...) + return openvpn.cmd.Start() +} + +func (openvpn *openvpnT) stop(w http.ResponseWriter, r *http.Request) { + log.Println("stop openvpn") + if openvpn.cmd == nil || openvpn.cmd.ProcessState != nil { + openvpn.cmd = nil + return + } + + err := openvpn.kill() + if err != nil { + log.Printf("Error stoping openvpn: %v", err) + w.Write([]byte(err.Error())) + } +} + +func (openvpn *openvpnT) kill() error { + err := kill(openvpn.cmd) + if err == nil { + openvpn.cmd.Wait() + } else { + log.Printf("Error killing the process: %v", err) + } + + openvpn.cmd = nil + return nil +} + +func firewallStartHandler(w http.ResponseWriter, r *http.Request) { + gateways, err := getArgs(r) + if err != nil { + log.Printf("An error has occurred processing gateways: %v", err) + w.Write([]byte(err.Error())) + return + } + + err = firewallStart(gateways) + if err != nil { + log.Printf("Error starting firewall: %v", err) + w.Write([]byte(err.Error())) + return + } + log.Println("Start firewall: firewall started") +} + +func firewallStopHandler(w http.ResponseWriter, r *http.Request) { + err := firewallStop() + if err != nil { + log.Printf("Error stoping firewall: %v", err) + w.Write([]byte(err.Error())) + } + log.Println("Stop firewall: firewall stopped") +} + +func firewallIsUpHandler(w http.ResponseWriter, r *http.Request) { + if firewallIsUp() { + w.Write([]byte("true")) + w.WriteHeader(http.StatusOK) + } else { + w.Write([]byte("false")) + w.WriteHeader(http.StatusNoContent) + } +} + +func getArgs(r *http.Request) ([]string, error) { + args := []string{} + decoder := json.NewDecoder(r.Body) + err := decoder.Decode(&args) + return args, err +} diff --git a/pkg/helper/linux.go b/pkg/helper/linux.go new file mode 100644 index 0000000..88c3e10 --- /dev/null +++ b/pkg/helper/linux.go @@ -0,0 +1,67 @@ +// +build linux +// Copyright (C) 2018 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 helper + +import ( + "log" + "os" + "os/exec" +) + +const ( + openvpnUser = "nobody" + openvpnGroup = "nogroup" + LogFolder = "/var/log/" + systemOpenvpnPath = "/usr/sbin/openvpn" + snapOpenvpnPath = "/snap/bin/riseup-vpn.openvpn" +) + +var ( + platformOpenvpnFlags = []string{ + "--script-security", "1", + "--user", openvpnUser, + "--group", openvpnGroup, + } +) + +func daemonize() {} + +func getOpenvpnPath() string { + if os.Getenv("SNAP") != "" { + return snapOpenvpnPath + } + return systemOpenvpnPath +} + +func kill(cmd *exec.Cmd) error { + return cmd.Process.Signal(os.Interrupt) +} + +func firewallStart(gateways []string) error { + log.Println("Start firewall: do nothing, not implemented") + return nil +} + +func firewallStop() error { + log.Println("Stop firewall: do nothing, not implemented") + return nil +} + +func firewallIsUp() bool { + log.Println("IsUp firewall: do nothing, not implemented") + return false +} diff --git a/pkg/helper/windows.go b/pkg/helper/windows.go new file mode 100644 index 0000000..a19c92b --- /dev/null +++ b/pkg/helper/windows.go @@ -0,0 +1,66 @@ +// +build windows +// Copyright (C) 2018 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 helper + +import ( + "log" + "os" + "os/exec" +) + +const ( + appPath = `C:\Program Files\RiseupVPN\` + LogFolder = appPath + openvpnPath = appPath + `openvpn.exe` + chocoOpenvpnPath = `C:\Program Files\OpenVPN\bin\openvpn.exe` +) + +var ( + platformOpenvpnFlags = []string{ + "--script-security", "1", + } +) + +func daemonize() {} + +func getOpenvpnPath() string { + if _, err := os.Stat(openvpnPath); !os.IsNotExist(err) { + return openvpnPath + } else if _, err := os.Stat(chocoOpenvpnPath); !os.IsNotExist(err) { + return chocoOpenvpnPath + } + return "openvpn.exe" +} + +func kill(cmd *exec.Cmd) error { + return cmd.Process.Kill() +} + +func firewallStart(gateways []string) error { + log.Println("Start firewall: do nothing, not implemented") + return nil +} + +func firewallStop() error { + log.Println("Stop firewall: do nothing, not implemented") + return nil +} + +func firewallIsUp() bool { + log.Println("IsUp firewall: do nothing, not implemented") + return false +} |