Implement login
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8f5ab6cab3
commit
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6
go.mod
6
go.mod
@ -2,4 +2,8 @@ module deuxfleurs.fr/Deuxfleurs/guichet
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go 1.13
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require github.com/gorilla/sessions v1.2.0
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require (
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github.com/go-ldap/ldap v3.0.3+incompatible
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github.com/go-ldap/ldap/v3 v3.1.6
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github.com/gorilla/sessions v1.2.0
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)
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6
go.sum
6
go.sum
@ -1,3 +1,9 @@
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github.com/go-asn1-ber/asn1-ber v1.3.1 h1:gvPdv/Hr++TRFCl0UbPFHC54P9N9jgsRPnmnr419Uck=
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github.com/go-asn1-ber/asn1-ber v1.3.1/go.mod h1:hEBeB/ic+5LoWskz+yKT7vGhhPYkProFKoKdwZRWMe0=
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github.com/go-ldap/ldap v3.0.3+incompatible h1:HTeSZO8hWMS1Rgb2Ziku6b8a7qRIZZMHjsvuZyatzwk=
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github.com/go-ldap/ldap v3.0.3+incompatible/go.mod h1:qfd9rJvER9Q0/D/Sqn1DfHRoBp40uXYvFoEVrNEPqRc=
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github.com/go-ldap/ldap/v3 v3.1.6 h1:VTihvB7egSAvU6KOagaiA/EvgJMR2jsjRAVIho2ydBo=
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github.com/go-ldap/ldap/v3 v3.1.6/go.mod h1:5Zun81jBTabRaI8lzN7E1JjyEl1g6zI6u9pd8luAK4Q=
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github.com/gorilla/securecookie v1.1.1 h1:miw7JPhV+b/lAHSXz4qd/nN9jRiAFV5FwjeKyCS8BvQ=
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github.com/gorilla/securecookie v1.1.1/go.mod h1:ra0sb63/xPlUeL+yeDciTfxMRAA+MP+HVt/4epWDjd4=
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github.com/gorilla/sessions v1.2.0 h1:S7P+1Hm5V/AT9cjEcUD5uDaQSX0OE577aCXgoaKpYbQ=
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136
main.go
136
main.go
@ -2,6 +2,7 @@ package main
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import (
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"os"
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"strings"
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"flag"
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"fmt"
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"log"
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@ -10,19 +11,29 @@ import (
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"encoding/json"
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"encoding/base64"
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"crypto/rand"
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"crypto/tls"
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"html/template"
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"github.com/gorilla/sessions"
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"github.com/go-ldap/ldap/v3"
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)
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type ConfigFile struct {
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HttpBindAddr string `json:"http_bind_addr"`
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SessionKey string `json:"session_key"`
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LdapServerAddr string `json:"ldap_server_addr"`
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LdapTLS bool `json:"ldap_tls"`
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UserFormat string `json:"user_format"`
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}
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var configFlag = flag.String("config", "./config.json", "Configuration file path")
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func readConfig() ConfigFile {
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var config *ConfigFile
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const SESSION_NAME = "guichet_session"
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var store *sessions.CookieStore = nil
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func readConfig() ConfigFile{
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key_bytes := make([]byte, 32)
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n, err := rand.Read(key_bytes)
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if err!= nil || n != 32 {
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@ -32,7 +43,9 @@ func readConfig() ConfigFile {
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config_file := ConfigFile{
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HttpBindAddr: ":9991",
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SessionKey: base64.StdEncoding.EncodeToString(key_bytes),
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LdapServerAddr: "127.0.0.1:389",
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LdapServerAddr: "ldap://127.0.0.1:389",
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LdapTLS: false,
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UserFormat: "cn=%s,ou=users,dc=example,dc=com",
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}
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_, err = os.Stat(*configFlag)
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@ -70,24 +83,133 @@ func readConfig() ConfigFile {
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return config_file
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}
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var store *sessions.CookieStore = nil
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func main() {
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flag.Parse()
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config := readConfig()
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config_file := readConfig()
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config = &config_file
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store = sessions.NewCookieStore([]byte(config.SessionKey))
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http.HandleFunc("/", handleHome)
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err := http.ListenAndServe(config.HttpBindAddr, nil)
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staticfiles := http.FileServer(http.Dir("static"))
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http.Handle("/static/", http.StripPrefix("/static/", staticfiles))
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err := http.ListenAndServe(config.HttpBindAddr, logRequest(http.DefaultServeMux))
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if err != nil {
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log.Fatal("Cannot start http server: ", err)
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}
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}
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type LoginInfo struct {
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Username string
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DN string
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Password string
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}
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func logRequest(handler http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s %s\n", r.RemoteAddr, r.Method, r.URL)
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handler.ServeHTTP(w, r)
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})
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}
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func checkLogin(w http.ResponseWriter, r *http.Request) *LoginInfo {
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session, err := store.Get(r, SESSION_NAME)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return nil
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}
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login_info, has_login_info := session.Values["login_info"]
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if !has_login_info {
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return handleLogin(w, r)
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}
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return login_info.(*LoginInfo)
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}
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func ldapOpen(w http.ResponseWriter) *ldap.Conn {
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l, err := ldap.DialURL(config.LdapServerAddr)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return nil
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}
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if config.LdapTLS {
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err = l.StartTLS(&tls.Config{InsecureSkipVerify: true})
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return nil
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}
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}
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return l
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}
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// Templates ----
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type LoginFormData struct {
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Username string
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ErrorMessage string
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}
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var (
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templateLogin = template.Must(template.ParseFiles("templates/layout.html", "templates/login.html"))
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)
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// Page handlers ----
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func handleHome(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "Hello, world!")
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login := checkLogin(w, r)
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if login == nil {
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return
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}
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fmt.Fprintf(w, "Welcome, %s!", login.Username)
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}
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func handleLogin(w http.ResponseWriter, r *http.Request) *LoginInfo {
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if r.Method == "GET" {
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templateLogin.Execute(w, LoginFormData{})
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return nil
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} else if r.Method == "POST" {
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r.ParseForm()
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username := strings.Join(r.Form["username"], "")
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user_dn := strings.ReplaceAll(config.UserFormat, "%s", username)
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login_info := &LoginInfo{
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DN: user_dn,
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Username: username,
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Password: strings.Join(r.Form["password"], ""),
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}
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l := ldapOpen(w)
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if l == nil {
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return nil
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}
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err := l.Bind(user_dn, login_info.Password)
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if err != nil {
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templateLogin.Execute(w, LoginFormData{
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Username: username,
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ErrorMessage: err.Error(),
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})
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return nil
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}
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// Successfully logged in, save it to session
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session, err := store.Get(r, SESSION_NAME)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return nil
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}
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session.Values["login_info"] = login_info
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return login_info
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} else {
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http.Error(w, "Unsupported method", http.StatusBadRequest)
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return nil
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}
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}
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6
static/style.css
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6
static/style.css
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@ -0,0 +1,6 @@
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#contents {
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width: 800px;
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margin: auto;
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margin-top: 16px;
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}
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13
templates/layout.html
Normal file
13
templates/layout.html
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@ -0,0 +1,13 @@
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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>{{template "title"}}</title>
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<link rel="stylesheet" href="/static/style.css">
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</head>
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<body>
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<div id="contents">
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{{template "body" .}}
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</div>
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</body>
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</html>
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12
templates/login.html
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12
templates/login.html
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{{define "title"}}Log in{{end}}
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{{define "body"}}
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<h1>Log in</h1>
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<form method="POST">
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<div>{{ .ErrorMessage }}</div>
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Username: <input type="text" name="username" value="{{ .Username }}" /><br />
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Password: <input type="password" name="password" /><br />
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<input type="submit" value="log in">
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</form>
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{{end}}
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