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main.go
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main.go
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package main
import (
"context"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/xml"
"flag"
"fmt"
"net"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
"time"
"github.com/julienschmidt/httprouter"
log "github.com/Sirupsen/logrus"
"github.com/crewjam/saml"
"github.com/crewjam/saml/samlsp"
"github.com/gorilla/securecookie"
"golang.org/x/crypto/acme/autocert"
)
var (
// Flags
cli = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
// datadir
datadir string
// The version is set by the build command.
version string
// httpd
httpAddr string
httpHost string
httpPrefix string
// Insecure http cookies (only recommended for internal LANs/VPNs)
httpInsecure bool
// set based on httpAddr
httpIP string
httpPort string
// backlink
backlink string
// show version
showVersion bool
// show help
showHelp bool
// debug logging
debug bool
// Let's Encrypt
letsencrypt bool
// HTTP read limit
httpReadLimit int64 = 2 * (1024 * 1024)
// securetoken
securetoken *securecookie.SecureCookie
// logger
logger = log.New()
// config
config *Config
// mailer
mailer = NewMailer()
// SAML
samlSP *samlsp.Middleware
// Error page HTML
errorPageHTML = `<html><head><title>Error</title></head><body text="orangered" bgcolor="black"><h1>An error has occurred</h1></body></html>`
)
func init() {
cli.StringVar(&datadir, "datadir", "/data", "data dir")
cli.StringVar(&backlink, "backlink", "", "backlink (optional)")
cli.StringVar(&httpHost, "http-host", "", "HTTP host")
cli.StringVar(&httpAddr, "http-addr", ":80", "HTTP listen address")
cli.BoolVar(&httpInsecure, "http-insecure", false, "enable sessions cookies for http (no https) not recommended")
cli.BoolVar(&letsencrypt, "letsencrypt", true, "enable TLS using Let's Encrypt on port 443")
cli.BoolVar(&showVersion, "version", false, "display version and exit")
cli.BoolVar(&showHelp, "help", false, "display help and exit")
cli.BoolVar(&debug, "debug", false, "debug mode")
}
func main() {
var err error
cli.Parse(os.Args[1:])
usage := func(msg string) {
if msg != "" {
fmt.Fprintf(os.Stderr, "ERROR: %s\n", msg)
}
fmt.Fprintf(os.Stderr, "Usage: %s --http-host subspace.example.com\n\n", os.Args[0])
cli.PrintDefaults()
}
if showHelp {
usage("Help info")
os.Exit(0)
}
if showVersion {
fmt.Printf("Subspace %s\n", version)
os.Exit(0)
}
// http host
if httpHost == "" {
usage("--http-host flag is required")
os.Exit(1)
}
// debug logging
logger.Out = os.Stdout
if debug {
logger.SetLevel(log.DebugLevel)
}
logger.Debugf("debug logging is enabled")
// http port
httpIP, httpPort, err := net.SplitHostPort(httpAddr)
if err != nil {
usage("invalid --http-addr: " + err.Error())
}
// Clean datadir path.
datadir = filepath.Clean(datadir)
// config
config, err = NewConfig("config.json")
if err != nil {
logger.Fatal(err)
}
// Secure token
securetoken = securecookie.New([]byte(config.FindInfo().HashKey), []byte(config.FindInfo().BlockKey))
// Configure SAML if metadata is present.
if len(config.FindInfo().SAML.IDPMetadata) > 0 {
if err := configureSAML(); err != nil {
logger.Warnf("configuring SAML failed: %s", err)
}
}
//
// Routes
//
r := &httprouter.Router{}
r.GET("/", Log(WebHandler(indexHandler, "index")))
r.GET("/help", Log(WebHandler(helpHandler, "help")))
r.GET("/configure", Log(WebHandler(configureHandler, "configure")))
r.POST("/configure", Log(WebHandler(configureHandler, "configure")))
// SAML
r.GET("/sso", Log(ssoHandler))
r.GET("/saml/metadata", Log(samlHandler))
r.POST("/saml/metadata", Log(samlHandler))
r.GET("/saml/acs", Log(samlHandler))
r.POST("/saml/acs", Log(samlHandler))
r.GET("/signin", Log(WebHandler(signinHandler, "signin")))
r.GET("/signout", Log(WebHandler(signoutHandler, "signout")))
r.POST("/signin", Log(WebHandler(signinHandler, "signin")))
r.GET("/forgot", Log(WebHandler(forgotHandler, "forgot")))
r.POST("/forgot", Log(WebHandler(forgotHandler, "forgot")))
r.GET("/settings", Log(WebHandler(settingsHandler, "settings")))
r.POST("/settings", Log(WebHandler(settingsHandler, "settings")))
r.GET("/user/edit/:user", Log(WebHandler(userEditHandler, "user/edit")))
r.POST("/user/edit", Log(WebHandler(userEditHandler, "user/edit")))
r.GET("/user/delete/:user", Log(WebHandler(userDeleteHandler, "user/delete")))
r.POST("/user/delete", Log(WebHandler(userDeleteHandler, "user/delete")))
r.GET("/profile/add", Log(WebHandler(profileAddHandler, "profile/add")))
r.POST("/profile/add", Log(WebHandler(profileAddHandler, "profile/add")))
r.GET("/profile/connect/:profile", Log(WebHandler(profileConnectHandler, "profile/connect")))
r.GET("/profile/delete/:profile", Log(WebHandler(profileDeleteHandler, "profile/delete")))
r.POST("/profile/delete", Log(WebHandler(profileDeleteHandler, "profile/delete")))
r.GET("/profile/config/wireguard/:profile", Log(WebHandler(wireguardConfigHandler, "profile/config/wireguard")))
r.GET("/profile/qrconfig/wireguard/:profile", Log(WebHandler(wireguardQRConfigHandler, "profile/qrconfig/wireguard")))
r.GET("/static/*path", staticHandler)
//
// Server
//
httpTimeout := 10 * time.Minute
maxHeaderBytes := 10 * (1024 * 1024)
// Plain text web server for use behind a reverse proxy.
if !letsencrypt {
httpd := &http.Server{
Handler: r,
Addr: net.JoinHostPort(httpIP, httpPort),
WriteTimeout: httpTimeout,
ReadTimeout: httpTimeout,
MaxHeaderBytes: maxHeaderBytes,
}
hostport := net.JoinHostPort(httpHost, httpPort)
if httpPort == "80" {
hostport = httpHost
}
logger.Infof("Subspace version: %s %s", version, &url.URL{
Scheme: "http",
Host: hostport,
Path: httpPrefix,
})
logger.Fatal(httpd.ListenAndServe())
}
// Let's Encrypt TLS mode
// autocert
certmanager := autocert.Manager{
Prompt: autocert.AcceptTOS,
Cache: autocert.DirCache(filepath.Join(datadir, "letsencrypt")),
HostPolicy: func(_ context.Context, host string) error {
host = strings.TrimPrefix(host, "www.")
if host == httpHost {
return nil
}
if host == config.FindInfo().Domain {
return nil
}
return fmt.Errorf("autocert: host %q not permitted by HostPolicy", host)
},
}
// http redirect to https and Let's Encrypt auth
go func() {
redir := httprouter.New()
redir.GET("/*path", func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
r.URL.Scheme = "https"
r.URL.Host = httpHost
http.Redirect(w, r, r.URL.String(), http.StatusFound)
})
httpd := &http.Server{
Handler: certmanager.HTTPHandler(redir),
Addr: net.JoinHostPort(httpIP, "80"),
WriteTimeout: httpTimeout,
ReadTimeout: httpTimeout,
MaxHeaderBytes: maxHeaderBytes,
}
if err := httpd.ListenAndServe(); err != nil {
logger.Fatalf("http server on port 80 failed: %s", err)
}
}()
// TLS
tlsConfig := tls.Config{
GetCertificate: certmanager.GetCertificate,
NextProtos: []string{"http/1.1"},
Rand: rand.Reader,
PreferServerCipherSuites: true,
MinVersion: tls.VersionTLS12,
CipherSuites: []uint16{
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
},
}
// Override default for TLS.
if httpPort == "80" {
httpPort = "443"
httpAddr = net.JoinHostPort(httpIP, httpPort)
}
httpsd := &http.Server{
Handler: r,
Addr: httpAddr,
WriteTimeout: httpTimeout,
ReadTimeout: httpTimeout,
MaxHeaderBytes: maxHeaderBytes,
}
// Enable TCP keep alives on the TLS connection.
tcpListener, err := net.Listen("tcp", httpAddr)
if err != nil {
logger.Fatalf("listen failed: %s", err)
return
}
tlsListener := tls.NewListener(tcpKeepAliveListener{tcpListener.(*net.TCPListener)}, &tlsConfig)
hostport := net.JoinHostPort(httpHost, httpPort)
if httpPort == "443" {
hostport = httpHost
}
logger.Infof("Subspace version: %s %s", version, &url.URL{
Scheme: "https",
Host: hostport,
Path: "/",
})
logger.Fatal(httpsd.Serve(tlsListener))
}
type tcpKeepAliveListener struct {
*net.TCPListener
}
func (l tcpKeepAliveListener) Accept() (c net.Conn, err error) {
tc, err := l.AcceptTCP()
if err != nil {
return
}
tc.SetKeepAlive(true)
tc.SetKeepAlivePeriod(10 * time.Minute)
return tc, nil
}
func configureSAML() error {
info := config.FindInfo()
if len(info.SAML.IDPMetadata) == 0 {
return fmt.Errorf("no IDP metadata")
}
entity := &saml.EntityDescriptor{}
err := xml.Unmarshal([]byte(info.SAML.IDPMetadata), entity)
if err != nil && err.Error() == "expected element type <EntityDescriptor> but have <EntitiesDescriptor>" {
entities := &saml.EntitiesDescriptor{}
if err := xml.Unmarshal([]byte(info.SAML.IDPMetadata), entities); err != nil {
return err
}
err = fmt.Errorf("no entity found with IDPSSODescriptor")
for i, e := range entities.EntityDescriptors {
if len(e.IDPSSODescriptors) > 0 {
entity = &entities.EntityDescriptors[i]
err = nil
}
}
}
if err != nil {
return err
}
keyPair, err := tls.X509KeyPair(info.SAML.Certificate, info.SAML.PrivateKey)
if err != nil {
return fmt.Errorf("failed to load SAML keypair: %s", err)
}
keyPair.Leaf, err = x509.ParseCertificate(keyPair.Certificate[0])
if err != nil {
return fmt.Errorf("failed to parse SAML certificate: %s", err)
}
rootURL := url.URL{
Scheme: "https",
Host: httpHost,
Path: "/",
}
newsp, err := samlsp.New(samlsp.Options{
URL: rootURL,
Key: keyPair.PrivateKey.(*rsa.PrivateKey),
Certificate: keyPair.Leaf,
IDPMetadata: entity,
CookieName: SessionCookieNameSSO,
CookieDomain: httpHost, // TODO: this will break if using a custom domain.
CookieSecure: !httpInsecure,
Logger: logger,
AllowIDPInitiated: true,
})
if err != nil {
logger.Warnf("failed to configure SAML: %s", err)
samlSP = nil
return fmt.Errorf("failed to configure SAML: %s", err)
}
samlSP = newsp
logger.Infof("successfully configured SAML")
return nil
}
func BestDomain() string {
domain := config.FindInfo().Domain
if domain != "" {
return domain
}
return httpHost
}