forked from kevana/ui-for-docker
/
dockerui.go
190 lines (168 loc) · 4.26 KB
/
dockerui.go
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package main // import "github.com/kevana/ui-for-docker"
import (
"flag"
"io"
"log"
"net"
"net/http"
"net/http/httputil"
"net/url"
"os"
"github.com/gorilla/csrf"
"io/ioutil"
"fmt"
"github.com/gorilla/securecookie"
"crypto/tls"
"crypto/x509"
)
var (
endpoint = flag.String("H", "unix:///var/run/docker.sock", "Dockerd endpoint")
addr = flag.String("p", ":9000", "Address and port to serve UI For Docker")
assets = flag.String("a", ".", "Path to the assets")
data = flag.String("d", ".", "Path to the data")
tlsverify = flag.Bool("tlsverify", false, "TLS support")
tlscacert = flag.String("tlscacert", "/certs/ca.pem", "Path to the CA")
tlscert = flag.String("tlscert", "/certs/cert.pem", "Path to the TLS certificate file")
tlskey = flag.String("tlskey", "/certs/key.pem", "Path to the TLS key")
authKey []byte
authKeyFile = "authKey.dat"
)
type UnixHandler struct {
path string
}
type TLSFlags struct {
tls bool
caPath string
certPath string
keyPath string
}
func (h *UnixHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
conn, err := net.Dial("unix", h.path)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
log.Println(err)
return
}
c := httputil.NewClientConn(conn, nil)
defer c.Close()
res, err := c.Do(r)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
log.Println(err)
return
}
defer res.Body.Close()
copyHeader(w.Header(), res.Header)
if _, err := io.Copy(w, res.Body); err != nil {
log.Println(err)
}
}
func copyHeader(dst, src http.Header) {
for k, vv := range src {
for _, v := range vv {
dst.Add(k, v)
}
}
}
func createTLSConfig(flags TLSFlags) *tls.Config {
cert, err := tls.LoadX509KeyPair(flags.certPath, flags.keyPath)
if err != nil {
log.Fatal(err)
}
caCert, err := ioutil.ReadFile(flags.caPath)
if err != nil {
log.Fatal(err)
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{cert},
RootCAs: caCertPool,
}
return tlsConfig;
}
func createTcpHandler(u *url.URL) http.Handler {
u.Scheme = "http";
return httputil.NewSingleHostReverseProxy(u)
}
func createTcpHandlerWithTLS(u *url.URL, flags TLSFlags) http.Handler {
u.Scheme = "https";
var tlsConfig = createTLSConfig(flags)
proxy := httputil.NewSingleHostReverseProxy(u)
proxy.Transport = &http.Transport{
TLSClientConfig: tlsConfig,
}
return proxy;
}
func createUnixHandler(e string) http.Handler {
return &UnixHandler{e}
}
func createHandler(dir string, d string, e string, flags TLSFlags) http.Handler {
var (
mux = http.NewServeMux()
fileHandler = http.FileServer(http.Dir(dir))
h http.Handler
)
u, perr := url.Parse(e)
if perr != nil {
log.Fatal(perr)
}
if u.Scheme == "tcp" {
if flags.tls {
h = createTcpHandlerWithTLS(u, flags)
} else {
h = createTcpHandler(u)
}
} else if u.Scheme == "unix" {
var socketPath = u.Path
if _, err := os.Stat(socketPath); err != nil {
if os.IsNotExist(err) {
log.Fatalf("unix socket %s does not exist", socketPath)
}
log.Fatal(err)
}
h = createUnixHandler(socketPath)
} else {
log.Fatalf("Bad Docker enpoint: %s. Only unix:// and tcp:// are supported.", e)
}
// Use existing csrf authKey if present or generate a new one.
var authKeyPath = d + "/" + authKeyFile
dat, err := ioutil.ReadFile(authKeyPath)
if err != nil {
fmt.Println(err)
authKey = securecookie.GenerateRandomKey(32)
err := ioutil.WriteFile(authKeyPath, authKey, 0644)
if err != nil {
fmt.Println("unable to persist auth key", err)
}
} else {
authKey = dat
}
CSRF := csrf.Protect(
authKey,
csrf.HttpOnly(false),
csrf.Secure(false),
)
mux.Handle("/dockerapi/", http.StripPrefix("/dockerapi", h))
mux.Handle("/", fileHandler)
return CSRF(csrfWrapper(mux))
}
func csrfWrapper(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-CSRF-Token", csrf.Token(r))
h.ServeHTTP(w, r)
})
}
func main() {
flag.Parse()
tlsFlags := TLSFlags{
tls: *tlsverify,
caPath: *tlscacert,
certPath: *tlscert,
keyPath: *tlskey,
}
handler := createHandler(*assets, *data, *endpoint, tlsFlags)
if err := http.ListenAndServe(*addr, handler); err != nil {
log.Fatal(err)
}
}