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openvpn-collision-manager.go
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openvpn-collision-manager.go
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package main
import (
"bufio"
"errors"
"fmt"
"net"
"os"
"os/exec"
"regexp"
"strings"
"github.com/gin-gonic/gin"
log "github.com/sirupsen/logrus"
"gopkg.in/alecthomas/kingpin.v2"
)
const (
ver string = "0.21"
)
var (
openvpnStatusFileList = StatusFileList(kingpin.Arg("openvpn status files", "openvpn status file list"))
openvpnProto = kingpin.Flag("openvpn-proto", "openvpn tunnel protocol").Default("tcp-udp").Short('p').String()
openvpnPort = kingpin.Flag("openvpn-port", "openvpn tunnel port").Default("1194").Short('r').String()
bindPort = kingpin.Flag("bind-port", "port to bind daemon to").Default("8888").Short('t').String()
bindAddr = kingpin.Flag("bind-addr", "address to bind daemon to").Default("127.0.0.1").Short('a').String()
logFile = kingpin.Flag("log-file", "log file").Default("/var/log/openvpn-collision-manager.log").Short('l').String()
)
type statusFileList []string
func (i *statusFileList) Set(value string) error {
*i = append(*i, value)
return nil
}
func (i *statusFileList) String() string {
return ""
}
func (i *statusFileList) IsCumulative() bool {
return true
}
func StatusFileList(s kingpin.Settings) (target *[]string) {
target = new([]string)
s.SetValue((*statusFileList)(target))
return
}
type BlockIp struct {
Username string `json:"username" binding:"required"`
Ip string `json:"ip" binding:"required"`
}
func getOpenvpnStatus(filename string) (map[string]map[string]string, error) {
scanner, file, err := scanfile(filename)
if err != nil {
return nil, err
}
defer file.Close()
v1, err := parsev1(scanner, filename)
if err != nil {
return nil, err
}
scanner, file, err = scanfile(filename)
if err != nil {
return nil, err
}
defer file.Close()
v2, err := parsev2(scanner, filename)
if err != nil {
return nil, err
}
if len(v1) > len(v2) {
return v1, nil
} else {
return v2, nil
}
}
func scanfile(filename string) (*bufio.Scanner, *os.File, error) {
file, err := os.Open(filename)
if err != nil {
return nil, nil, fmt.Errorf("cannot open openvpn status file %s", filename)
}
scanner := bufio.NewScanner(file)
return scanner, file, nil
}
// parse the original v1 openvpn log format
func parsev1(scanner *bufio.Scanner, filename string) (map[string]map[string]string, error) {
openvpnStatus := make(map[string]map[string]string)
for scanner.Scan() {
user := strings.Split(scanner.Text(), ",")
// parse only CLIENT LIST lines, not ROUTING TABLE
// expecting 5 comma delimited values in the row
// also skip the header
if len(user) == 5 && user[1] != "Real Address" {
//log.Infof("FOUND %s", user)
var revdns string = ""
ip := strings.Split(user[1], ":")[0]
rev, err := net.LookupAddr(ip)
if err == nil {
revdns = rev[0]
}
openvpnStatus[user[0]] = map[string]string{
"username": user[0],
"remote_ip": ip,
"remote_revdns": revdns,
"bytes_recv": user[2],
"bytes_sent": user[3],
"connected_since": user[4],
"source_status_file": filename,
}
}
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("cannot parse openvpn status file %s", filename)
}
return openvpnStatus, nil
}
// parse the new v2 openvpn log format
func parsev2(scanner *bufio.Scanner, filename string) (map[string]map[string]string, error) {
openvpnStatus := make(map[string]map[string]string)
for scanner.Scan() {
user := strings.Split(scanner.Text(), ",")
//log.Infof("XXXFOUND %s", user)
if user[0] == "CLIENT_LIST" {
var revdns string = ""
ip := strings.Split(user[2], ":")[0]
rev, err := net.LookupAddr(ip)
if err == nil {
revdns = rev[0]
}
openvpnStatus[user[1]] = map[string]string{
"username": user[1],
"remote_ip": ip,
"remote_revdns": revdns,
"bytes_recv": user[5],
"bytes_sent": user[6],
"connected_since": user[7],
"source_status_file": filename,
}
}
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("cannot parse openvpn status file %s", filename)
}
return openvpnStatus, nil
}
func stringInMapValue(a string, list []map[string]string) bool {
for _, item := range list {
for k := range item {
if k == a {
return true
}
}
}
return false
}
func getIptablesData() (map[string][]map[string]string, error) {
iptablesData := make([]map[string]string, 0)
cmd, err := exec.Command("iptables", "-nL", "INPUT").Output()
if err != nil {
return nil, errors.New("cannot gather iptables output")
}
lines := strings.Split(string(cmd), "\n")
// DROP tcp -- 1.1.1.1 0.0.0.0/0 tcp dpt:1194 STRING match "test@wikia-inc.com" ALGO name bm TO 65535 /* test@wikia-inc.com */
r := regexp.MustCompile(`\w+\s+\w+\s+\S+\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}).+/\*\s(.+)\s\*/`)
for _, line := range lines {
if matches := r.FindStringSubmatch(line); matches != nil {
iptablesData = append(iptablesData, map[string]string{matches[2]: matches[1]})
}
}
iptablesDataMap := make(map[string][]map[string]string)
for _, entry := range iptablesData {
for key, value := range entry {
// do not append duplicates
if !stringInMapValue(value, iptablesDataMap[key]) {
a := make(map[string]string)
rev, err := net.LookupAddr(value)
if err == nil {
a[value] = rev[0]
} else {
a[value] = ""
}
iptablesDataMap[key] = append(iptablesDataMap[key], a)
}
}
}
return iptablesDataMap, nil
}
func addIptablesRule(ip, username, proto string) error {
cmdName := "iptables"
cmdArgs := []string{
"-A",
"INPUT",
"-s",
ip,
"-p",
proto,
"--dport",
*openvpnPort,
"-m",
"string",
"--string",
username,
"--algo",
"bm",
"-m",
"comment",
"--comment",
username,
"-j",
"DROP",
}
return executeShell(cmdName, cmdArgs)
}
func deleteIptablesRule(ip, username, proto string) bool {
cmdName := "iptables"
cmdArgs := []string{
"-D",
"INPUT",
"-s",
ip,
"-p",
proto,
"--dport",
*openvpnPort,
"-m",
"string",
"--string",
username,
"--algo",
"bm",
"-m",
"comment",
"--comment",
username,
"-j",
"DROP",
}
var success bool = false
for {
err := executeShell(cmdName, cmdArgs)
if err == nil {
success = true
} else {
break
}
}
return success
}
func executeShell(cmdName string, cmdArgs []string) error {
if err := exec.Command(cmdName, cmdArgs...).Run(); err == nil {
log.Debugf("Executing shell command success: %s %s", cmdName, strings.Join(cmdArgs, " "))
return nil
} else {
log.Debugf("Executing shell command failed: %s %s: %s", cmdName, strings.Join(cmdArgs, " "), err)
return fmt.Errorf("cannot execute shell command: %s %s: %s", cmdName, strings.Join(cmdArgs, " "), err)
}
}
func getUserData(c *gin.Context) {
username := c.Param("username")
log.Infof("Getting data for user %s", username)
result := make(gin.H)
ovpnStatus := make(map[string]map[string]string)
for _, statusFile := range *openvpnStatusFileList {
status, err := getOpenvpnStatus(statusFile)
if err == nil {
for k, v := range status {
ovpnStatus[k] = v
}
} else {
c.JSON(500, gin.H{"error": fmt.Sprintf("cannot get data from openvpn status file %s: %s", statusFile, err)})
return
}
}
if value, ok := ovpnStatus[username]; ok {
result["username"] = username
result["status"] = "connected"
result["remote_ip"] = value["remote_ip"]
result["remote_revdns"] = value["remote_revdns"]
result["bytes_recv"] = value["bytes_recv"]
result["bytes_sent"] = value["bytes_sent"]
result["connected_since"] = value["connected_since"]
result["source_status_file"] = value["source_status_file"]
} else {
result["username"] = username
result["status"] = "disconnected"
}
iptablesData, err := getIptablesData()
if err != nil {
log.Errorf("Cannot get iptables data: %s", err)
}
if value, ok := iptablesData[username]; ok {
result["blocked_ip"] = value
} else {
result["blocked_ip"] = []string{}
}
c.JSON(200, result)
}
func blockIp(c *gin.Context) {
var json BlockIp
var username, ip string
if c.BindJSON(&json) == nil {
username = json.Username
ip = json.Ip
}
if username == "" || ip == "" {
c.JSON(500, gin.H{"error": "username or ip empty"})
return
}
log.Infof("Blocking IP %s for %s", ip, username)
iptablesData, err := getIptablesData()
if err != nil {
c.JSON(500, gin.H{"error": "cannot get iptables data"})
return
}
if stringInMapValue(ip, iptablesData[username]) {
log.Infof("IP %s already blocked for %s", ip, username)
c.JSON(200, gin.H{"status": "ok"})
return
}
var success bool = false
if *openvpnProto == "tcp-udp" {
var fail bool = false
for _, proto := range []string{"tcp", "udp"} {
err = addIptablesRule(ip, username, proto)
if err != nil {
log.Warningf("Cannot add iptables rule with IP %s, protocol %s for user %s", ip, proto, username)
fail = true
}
}
if !fail {
success = true
}
} else if *openvpnProto == "tcp" || *openvpnProto == "udp" {
err = addIptablesRule(ip, username, *openvpnProto)
if err == nil {
success = true
} else {
log.Warningf("Cannot add iptables rule with IP %s, protocol %s for user %s", ip, *openvpnProto, username)
}
}
if success {
c.JSON(200, gin.H{"status": "ok"})
} else {
c.JSON(500, gin.H{"status": "failed"})
}
}
func unblockIp(c *gin.Context) {
var json BlockIp
var username, ip string
if c.BindJSON(&json) == nil {
username = json.Username
ip = json.Ip
}
if username == "" || ip == "" {
c.JSON(500, gin.H{"error": "username or ip empty"})
return
}
log.Infof("Unblocking IP %s for %s", ip, username)
var success bool = false
if *openvpnProto == "tcp-udp" {
var fail bool = false
for _, proto := range []string{"tcp", "udp"} {
if !deleteIptablesRule(ip, username, proto) {
log.Warningf("Cannot delete iptables rule with IP %s, protocol %s for user %s", ip, proto, username)
fail = true
}
}
if !fail {
success = true
}
} else if *openvpnProto == "tcp" || *openvpnProto == "udp" {
if deleteIptablesRule(ip, username, *openvpnProto) {
success = true
} else {
log.Warningf("Cannot delete iptables rule with IP %s, protocol %s for user %s", ip, *openvpnProto, username)
}
}
if success {
c.JSON(200, gin.H{"status": "ok"})
} else {
c.JSON(500, gin.H{"status": "failed"})
}
}
func main() {
kingpin.Version(ver)
kingpin.Parse()
if *openvpnProto != "tcp-udp" && *openvpnProto != "tcp" && *openvpnProto != "udp" {
kingpin.FatalUsage("possible protocol variants: tcp, udp, tcp-udp")
}
if len(*openvpnStatusFileList) == 0 {
kingpin.FatalUsage("no openvpn status file provided")
}
f, err := os.OpenFile(*logFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
panic(err)
}
defer f.Close()
log.SetOutput(f)
log.SetLevel(log.DebugLevel)
log.SetFormatter(&log.TextFormatter{DisableColors: true})
r := gin.Default()
r.GET("/ping", func(c *gin.Context) {
c.JSON(200, gin.H{
"message": "pong",
})
})
r.GET("/users/:username", getUserData)
r.POST("/blockip", blockIp)
r.POST("/unblockip", unblockIp)
r.Run(*bindAddr + ":" + *bindPort)
}