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gortr.go
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gortr.go
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package main
import (
"bytes"
"crypto/ecdsa"
"crypto/sha256"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"errors"
"flag"
"fmt"
rtr "github.com/cloudflare/gortr/lib"
"github.com/cloudflare/gortr/prefixfile"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
log "github.com/sirupsen/logrus"
"golang.org/x/crypto/ssh"
"io"
"io/ioutil"
"net"
"net/http"
"os"
"os/signal"
"runtime"
"strconv"
"strings"
"syscall"
"time"
)
const (
ENV_SSH_PASSWORD = "GORTR_SSH_PASSWORD"
ENV_SSH_KEY = "GORTR_SSH_AUTHORIZEDKEYS"
METHOD_NONE = iota
METHOD_PASSWORD
METHOD_KEY
)
var (
version = ""
buildinfos = ""
AppVersion = "GoRTR " + version + " " + buildinfos
MetricsAddr = flag.String("metrics.addr", ":8080", "Metrics address")
MetricsPath = flag.String("metrics.path", "/metrics", "Metrics path")
RTRVersion = flag.Int("protocol", 1, "RTR protocol version")
Bind = flag.String("bind", ":8282", "Bind address")
BindTLS = flag.String("tls.bind", "", "Bind address for TLS")
TLSCert = flag.String("tls.cert", "", "Certificate path")
TLSKey = flag.String("tls.key", "", "Private key path")
BindSSH = flag.String("ssh.bind", "", "Bind address for SSH")
SSHKey = flag.String("ssh.key", "private.pem", "SSH host key")
SSHAuthEnablePassword = flag.Bool("ssh.method.password", false, "Enable password auth")
SSHAuthUser = flag.String("ssh.auth.user", "rpki", "SSH user")
SSHAuthPassword = flag.String("ssh.auth.password", "", fmt.Sprintf("SSH password (if blank, will use envvar %v)", ENV_SSH_PASSWORD))
SSHAuthEnableKey = flag.Bool("ssh.method.key", false, "Enable key auth")
SSHAuthKeysBypass = flag.Bool("ssh.auth.key.bypass", false, "Accept any SSH key")
SSHAuthKeysList = flag.String("ssh.auth.key.file", "", fmt.Sprintf("Authorized SSH key file (if blank, will use envvar %v", ENV_SSH_KEY))
TimeCheck = flag.Bool("checktime", true, "Check if file is still valid")
Verify = flag.Bool("verify", true, "Check signature using provided public key (disable by passing -verify=false)")
PublicKey = flag.String("verify.key", "cf.pub", "Public key path (PEM file)")
CacheBin = flag.String("cache", "https://rpki.cloudflare.com/rpki.json", "URL of the cached JSON data")
UserAgent = flag.String("useragent", fmt.Sprintf("Cloudflare-%v (+https://github.com/cloudflare/gortr)", AppVersion), "User-Agent header")
RefreshInterval = flag.Int("refresh", 600, "Refresh interval in seconds")
MaxConn = flag.Int("maxconn", 0, "Max simultaneous connections (0 to disable limit)")
SendNotifs = flag.Bool("notifications", true, "Send notifications to clients")
LogLevel = flag.String("loglevel", "info", "Log level")
Version = flag.Bool("version", false, "Print version")
NumberOfROAs = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Name: "rpki_roas",
Help: "Number of ROAS.",
},
[]string{"ip_version", "filtered", "path"},
)
LastRefresh = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Name: "rpki_refresh",
Help: "Last refresh.",
},
[]string{"path"},
)
ClientsMetric = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Name: "rtr_clients",
Help: "Number of clients connected.",
},
[]string{"bind"},
)
PDUsRecv = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "rtr_pdus",
Help: "PDU received.",
},
[]string{"type"},
)
protoverToLib = map[int]uint8{
0: rtr.PROTOCOL_VERSION_0,
1: rtr.PROTOCOL_VERSION_1,
}
authToId = map[string]int{
"none": METHOD_NONE,
"password": METHOD_PASSWORD,
//"key": METHOD_KEY,
}
)
func initMetrics() {
prometheus.MustRegister(NumberOfROAs)
prometheus.MustRegister(LastRefresh)
prometheus.MustRegister(ClientsMetric)
prometheus.MustRegister(PDUsRecv)
}
func metricHTTP() {
http.Handle(*MetricsPath, promhttp.Handler())
log.Fatal(http.ListenAndServe(*MetricsAddr, nil))
}
func fetchFile(file string, ua string) ([]byte, error) {
var f io.Reader
var err error
if len(file) > 8 && (file[0:7] == "http://" || file[0:8] == "https://") {
// Copying base of DefaultTransport from https://golang.org/src/net/http/transport.go
// There is a proposal for a Clone of
tr := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
ProxyConnectHeader: map[string][]string{},
}
// Keep User-Agent in proxy request
tr.ProxyConnectHeader.Set("User-Agent", ua)
client := &http.Client{Transport: tr}
req, err := http.NewRequest("GET", file, nil)
req.Header.Set("User-Agent", ua)
req.Header.Set("Accept", "text/json")
proxyurl, err := http.ProxyFromEnvironment(req)
if err != nil {
return nil, err
}
proxyreq := http.ProxyURL(proxyurl)
tr.Proxy = proxyreq
if err != nil {
return nil, err
}
fhttp, err := client.Do(req)
if err != nil {
return nil, err
}
f = fhttp.Body
} else {
f, err = os.Open(file)
if err != nil {
return nil, err
}
}
data, err2 := ioutil.ReadAll(f)
if err2 != nil {
return nil, err2
}
return data, nil
}
func checkFile(data []byte) ([]byte, error) {
hsum := sha256.Sum256(data)
return hsum[:], nil
}
func decodeJSON(data []byte) (*prefixfile.ROAList, error) {
buf := bytes.NewBuffer(data)
dec := json.NewDecoder(buf)
var roalistjson prefixfile.ROAList
err := dec.Decode(&roalistjson)
return &roalistjson, err
}
func processData(roalistjson *prefixfile.ROAList) ([]rtr.ROA, int, int, int) {
filterDuplicates := make(map[string]bool)
roalist := make([]rtr.ROA, 0)
var count int
var countv4 int
var countv6 int
for _, v := range roalistjson.Data {
_, prefix, _ := net.ParseCIDR(v.Prefix)
asnStr := v.ASN[2:len(v.ASN)]
asnInt, _ := strconv.ParseUint(asnStr, 10, 32)
asn := uint32(asnInt)
count++
if prefix.IP.To4() != nil {
countv4++
} else if prefix.IP.To16() != nil {
countv6++
}
key := fmt.Sprintf("%v,%v,%v", prefix, asn, v.Length)
_, exists := filterDuplicates[key]
if !exists {
filterDuplicates[key] = true
} else {
continue
}
roa := rtr.ROA{
Prefix: *prefix,
ASN: asn,
MaxLen: v.Length,
}
roalist = append(roalist, roa)
}
return roalist, count, countv4, countv6
}
type IdenticalFile struct {
File string
}
func (e IdenticalFile) Error() string {
return fmt.Sprintf("File %v is identical to the previous version", e.File)
}
func (s *state) updateFile(file string) error {
log.Debugf("Refreshing cache from %v", file)
data, err := fetchFile(file, s.userAgent)
if err != nil {
log.Error(err)
return err
}
hsum, _ := checkFile(data)
if s.lasthash != nil {
cres := bytes.Compare(s.lasthash, hsum)
if cres == 0 {
return IdenticalFile{File: file}
}
}
s.lastts = time.Now().UTC()
s.lastdata = data
roalistjson, err := decodeJSON(s.lastdata)
if err != nil {
return err
}
if s.checktime {
validtime := time.Unix(int64(roalistjson.Metadata.Valid), 0).UTC()
if time.Now().UTC().After(validtime) {
return errors.New(fmt.Sprintf("File is expired: %v", validtime))
}
}
if s.verify {
log.Debugf("Verifying signature in %v", file)
if roalistjson.Metadata.SignatureDate == "" || roalistjson.Metadata.Signature == "" {
return errors.New("No signatures in file")
}
validdata, validdatatime, err := roalistjson.CheckFile(s.pubkey)
if err != nil {
return err
}
if !(validdata && (validdatatime || !s.checktime)) {
return errors.New("Invalid signatures")
}
log.Debugf("Signature verified")
}
roas, count, countv4, countv6 := processData(roalistjson)
if err != nil {
return err
}
log.Infof("New update (%v uniques, %v total prefixes). %v bytes. Updating sha256 hash %x -> %x",
len(roas), count, len(s.lastconverted), s.lasthash, hsum)
s.lasthash = hsum
s.server.AddROAs(roas)
sessid, _ := s.server.GetSessionId(nil)
serial, _ := s.server.GetCurrentSerial(sessid)
log.Infof("Updated added, new serial %v", serial)
if s.sendNotifs {
log.Debugf("Sending notifications to clients")
s.server.NotifyClientsLatest()
}
if s.metricsEvent != nil {
var countv4_dup int
var countv6_dup int
for _, roa := range roas {
if roa.Prefix.IP.To4() != nil {
countv4_dup++
} else if roa.Prefix.IP.To16() != nil {
countv6_dup++
}
}
s.metricsEvent.UpdateMetrics(countv4, countv6, countv4_dup, countv6_dup, s.lastts, file)
}
return nil
}
func (s *state) routineUpdate(file string, interval int) {
log.Debugf("Starting refresh routine (file: %v, interval: %vs)", file, interval)
signals := make(chan os.Signal, 1)
signal.Notify(signals, syscall.SIGHUP)
for {
delay := time.NewTimer(time.Duration(interval) * time.Second)
select {
case <-delay.C:
case <-signals:
log.Debug("Received HUP signal")
}
delay.Stop()
err := s.updateFile(file)
if err != nil {
switch err.(type) {
case IdenticalFile:
log.Info(err)
default:
log.Errorf("Error updating: %v", err)
}
}
}
}
type state struct {
lastdata []byte
lastconverted []byte
lasthash []byte
lastts time.Time
sendNotifs bool
userAgent string
server *rtr.Server
metricsEvent *metricsEvent
pubkey *ecdsa.PublicKey
verify bool
checktime bool
}
type metricsEvent struct {
}
func (m *metricsEvent) ClientConnected(c *rtr.Client) {
ClientsMetric.WithLabelValues(c.GetLocalAddress().String()).Inc()
}
func (m *metricsEvent) ClientDisconnected(c *rtr.Client) {
ClientsMetric.WithLabelValues(c.GetLocalAddress().String()).Dec()
}
func (m *metricsEvent) HandlePDU(c *rtr.Client, pdu rtr.PDU) {
PDUsRecv.WithLabelValues(
strings.ToLower(
strings.Replace(
rtr.TypeToString(
pdu.GetType()),
" ",
"_", -1))).Inc()
}
func (m *metricsEvent) UpdateMetrics(numIPv4 int, numIPv6 int, numIPv4filtered int, numIPv6filtered int, refreshed time.Time, file string) {
NumberOfROAs.WithLabelValues("ipv4", "filtered", file).Set(float64(numIPv4filtered))
NumberOfROAs.WithLabelValues("ipv4", "unfiltered", file).Set(float64(numIPv4))
NumberOfROAs.WithLabelValues("ipv6", "filtered", file).Set(float64(numIPv6filtered))
NumberOfROAs.WithLabelValues("ipv6", "unfiltered", file).Set(float64(numIPv6))
LastRefresh.WithLabelValues(file).Set(float64(refreshed.UnixNano() / 1e9))
}
func ReadPublicKey(key []byte, isPem bool) (*ecdsa.PublicKey, error) {
if isPem {
block, _ := pem.Decode(key)
key = block.Bytes
}
k, err := x509.ParsePKIXPublicKey(key)
if err != nil {
return nil, err
}
kconv, ok := k.(*ecdsa.PublicKey)
if !ok {
return nil, errors.New("Not EDCSA public key")
}
return kconv, nil
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
flag.Parse()
if *Version {
fmt.Println(AppVersion)
os.Exit(0)
}
lvl, _ := log.ParseLevel(*LogLevel)
log.SetLevel(lvl)
deh := &rtr.DefaultRTREventHandler{
Log: log.StandardLogger(),
}
sc := rtr.ServerConfiguration{
ProtocolVersion: protoverToLib[*RTRVersion],
KeepDifference: 3,
Log: log.StandardLogger(),
}
var me *metricsEvent
if *MetricsAddr != "" {
initMetrics()
go metricHTTP()
me = &metricsEvent{}
}
server := rtr.NewServer(sc, me, deh)
deh.SetROAManager(server)
var pubkey *ecdsa.PublicKey
if *Verify {
pubkeyBytes, err := ioutil.ReadFile(*PublicKey)
if err != nil {
log.Fatal(err)
}
pubkey, err = ReadPublicKey(pubkeyBytes, true)
if err != nil {
log.Fatal(err)
}
}
s := state{
server: server,
metricsEvent: me,
sendNotifs: *SendNotifs,
pubkey: pubkey,
verify: *Verify,
checktime: *TimeCheck,
userAgent: *UserAgent,
}
if *Bind == "" && *BindTLS == "" && *BindSSH == "" {
log.Fatalf("Specify at least a bind address")
}
if *Bind != "" {
go func() {
err := server.Start(*Bind)
if err != nil {
log.Fatal(err)
}
}()
}
if *BindTLS != "" {
cert, err := tls.LoadX509KeyPair(*TLSCert, *TLSKey)
if err != nil {
log.Fatal(err)
}
tlsConfig := tls.Config{
Certificates: []tls.Certificate{cert},
}
go func() {
err := server.StartTLS(*BindTLS, &tlsConfig)
if err != nil {
log.Fatal(err)
}
}()
}
if *BindSSH != "" {
sshkey, err := ioutil.ReadFile(*SSHKey)
if err != nil {
log.Fatal(err)
}
private, err := ssh.ParsePrivateKey(sshkey)
if err != nil {
log.Fatal("Failed to parse private key: ", err)
}
sshConfig := ssh.ServerConfig{}
log.Infof("Enabling ssh with the following authentications: password=%v, key=%v", *SSHAuthEnablePassword, *SSHAuthEnableKey)
if *SSHAuthEnablePassword {
password := *SSHAuthPassword
if password == "" {
password = os.Getenv(ENV_SSH_PASSWORD)
}
sshConfig.PasswordCallback = func(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
log.Infof("Connected (ssh-password): %v/%v", conn.User(), conn.RemoteAddr())
if conn.User() != *SSHAuthUser || !bytes.Equal(password, []byte(*SSHAuthPassword)) {
log.Warnf("Wrong user or password for %v/%v. Disconnecting.", conn.User(), conn.RemoteAddr())
return nil, errors.New("Wrong user or password")
}
return &ssh.Permissions{
CriticalOptions: make(map[string]string),
Extensions: make(map[string]string),
}, nil
}
}
if *SSHAuthEnableKey {
var sshClientKeysToDecode string
if *SSHAuthKeysList == "" {
sshClientKeysToDecode = os.Getenv(ENV_SSH_KEY)
} else {
sshClientKeysToDecodeBytes, err := ioutil.ReadFile(*SSHAuthKeysList)
if err != nil {
log.Fatal(err)
}
sshClientKeysToDecode = string(sshClientKeysToDecodeBytes)
}
sshClientKeys := strings.Split(sshClientKeysToDecode, "\n")
sshConfig.PublicKeyCallback = func(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
keyBase64 := base64.RawStdEncoding.EncodeToString(key.Marshal())
if !*SSHAuthKeysBypass {
var noKeys bool
for i, k := range sshClientKeys {
if k == "" {
continue
}
if strings.HasPrefix(fmt.Sprintf("%v %v", key.Type(), keyBase64), k) {
log.Infof("Connected (ssh-key): %v/%v with key %v %v (matched with line %v)",
conn.User(), conn.RemoteAddr(), key.Type(), keyBase64, i+1)
noKeys = true
break
}
}
if !noKeys {
log.Warnf("No key for %v/%v %v %v. Disconnecting.", conn.User(), conn.RemoteAddr(), key.Type(), keyBase64)
return nil, errors.New("Key not found")
}
} else {
log.Infof("Connected (ssh-key): %v/%v with key %v %v", conn.User(), conn.RemoteAddr(), key.Type(), keyBase64)
}
return &ssh.Permissions{
CriticalOptions: make(map[string]string),
Extensions: make(map[string]string),
}, nil
}
}
if !(*SSHAuthEnableKey || *SSHAuthEnablePassword) {
sshConfig.NoClientAuth = true
}
sshConfig.AddHostKey(private)
go func() {
err := server.StartSSH(*BindSSH, &sshConfig)
if err != nil {
log.Fatal(err)
}
}()
}
err := s.updateFile(*CacheBin)
if err != nil {
switch err.(type) {
case IdenticalFile:
log.Info(err)
default:
log.Errorf("Error updating: %v", err)
}
}
s.routineUpdate(*CacheBin, *RefreshInterval)
}