diff --git a/config.go b/config.go
new file mode 100644
index 0000000..c931b54
--- /dev/null
+++ b/config.go
@@ -0,0 +1,93 @@
+/*
+config handles reading the config.json file at the root and processing the settings
+*/
+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+)
+
+type ConfigFile struct {
+	HttpBindAddr   string `json:"http_bind_addr"`
+	LdapServerAddr string `json:"ldap_server_addr"`
+	LdapTLS        bool   `json:"ldap_tls"`
+
+	BaseDN        string `json:"base_dn"`
+	UserBaseDN    string `json:"user_base_dn"`
+	UserNameAttr  string `json:"user_name_attr"`
+	GroupBaseDN   string `json:"group_base_dn"`
+	GroupNameAttr string `json:"group_name_attr"`
+
+	MailingBaseDN       string `json:"mailing_list_base_dn"`
+	MailingNameAttr     string `json:"mailing_list_name_attr"`
+	MailingGuestsBaseDN string `json:"mailing_list_guest_user_base_dn"`
+
+	InvitationBaseDN   string   `json:"invitation_base_dn"`
+	InvitationNameAttr string   `json:"invitation_name_attr"`
+	InvitedMailFormat  string   `json:"invited_mail_format"`
+	InvitedAutoGroups  []string `json:"invited_auto_groups"`
+
+	WebAddress   string `json:"web_address"`
+	MailFrom     string `json:"mail_from"`
+	SMTPServer   string `json:"smtp_server"`
+	SMTPUsername string `json:"smtp_username"`
+	SMTPPassword string `json:"smtp_password"`
+
+	AdminAccount   string `json:"admin_account"`
+	GroupCanInvite string `json:"group_can_invite"`
+	GroupCanAdmin  string `json:"group_can_admin"`
+
+	S3AdminEndpoint string `json:"s3_admin_endpoint"`
+	S3AdminToken    string `json:"s3_admin_token"`
+
+	S3Endpoint  string `json:"s3_endpoint"`
+	S3AccessKey string `json:"s3_access_key"`
+	S3SecretKey string `json:"s3_secret_key"`
+	S3Region    string `json:"s3_region"`
+	S3Bucket    string `json:"s3_bucket"`
+
+	Org string `json:"org"`
+}
+
+var configFlag = flag.String("config", "./config.json", "Configuration file path")
+
+var config *ConfigFile
+
+func readConfig() ConfigFile {
+	// Default configuration values for certain fields
+	config_file := ConfigFile{
+		HttpBindAddr:   ":9991",
+		LdapServerAddr: "ldap://127.0.0.1:389",
+
+		UserNameAttr:  "uid",
+		GroupNameAttr: "gid",
+
+		InvitationNameAttr: "cn",
+		InvitedAutoGroups:  []string{},
+
+		Org: "ResDigita",
+	}
+
+	_, err := os.Stat(*configFlag)
+	if os.IsNotExist(err) {
+		log.Fatalf("Could not find Guichet configuration file at %s. Please create this file, for exemple starting with config.json.exemple and customizing it for your deployment.", *configFlag)
+	}
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	bytes, err := ioutil.ReadFile(*configFlag)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = json.Unmarshal(bytes, &config_file)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return config_file
+}
diff --git a/login.go b/login.go
new file mode 100644
index 0000000..cffafe8
--- /dev/null
+++ b/login.go
@@ -0,0 +1,262 @@
+/*
+login handles login and current-user verification
+*/
+
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+
+	"github.com/go-ldap/ldap/v3"
+)
+
+type LoginInfo struct {
+	Username string
+	DN       string
+	Password string
+}
+
+type LoginStatus struct {
+	Info      *LoginInfo
+	conn      *ldap.Conn
+	UserEntry *ldap.Entry
+	CanAdmin  bool
+	CanInvite bool
+}
+
+func (login *LoginStatus) WelcomeName() string {
+	ret := login.UserEntry.GetAttributeValue("givenName")
+	if ret == "" {
+		ret = login.UserEntry.GetAttributeValue("displayName")
+	}
+	if ret == "" {
+		ret = login.Info.Username
+	}
+	return ret
+}
+
+func checkLogin(w http.ResponseWriter, r *http.Request) *LoginStatus {
+	var login_info *LoginInfo
+
+	session, err := store.Get(r, SESSION_NAME)
+	if err == nil {
+		username, ok := session.Values["login_username"]
+		password, ok2 := session.Values["login_password"]
+		user_dn, ok3 := session.Values["login_dn"]
+
+		if ok && ok2 && ok3 {
+			login_info = &LoginInfo{
+				DN:       user_dn.(string),
+				Username: username.(string),
+				Password: password.(string),
+			}
+		}
+	}
+
+	if login_info == nil {
+		login_info = handleLogin(w, r)
+		if login_info == nil {
+			return nil
+		}
+	}
+
+	l := ldapOpen(w)
+	if l == nil {
+		return nil
+	}
+
+	err = l.Bind(login_info.DN, login_info.Password)
+	if err != nil {
+		delete(session.Values, "login_username")
+		delete(session.Values, "login_password")
+		delete(session.Values, "login_dn")
+
+		err = session.Save(r, w)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return nil
+		}
+		return checkLogin(w, r)
+	}
+
+	loginStatus := &LoginStatus{
+		Info: login_info,
+		conn: l,
+	}
+
+	requestKind := "(objectClass=organizationalPerson)"
+	if strings.EqualFold(login_info.DN, config.AdminAccount) {
+		requestKind = "(objectclass=*)"
+	}
+	searchRequest := ldap.NewSearchRequest(
+		login_info.DN,
+		ldap.ScopeBaseObject, ldap.NeverDerefAliases, 0, 0, false,
+		requestKind,
+		[]string{
+			"dn",
+			"displayname",
+			"givenname",
+			"sn",
+			"mail",
+			"cn",
+			"memberof",
+			"description",
+			"garage_s3_access_key",
+		},
+		nil)
+	//			FIELD_NAME_DIRECTORY_VISIBILITY,
+	//			FIELD_NAME_PROFILE_PICTURE,
+
+	sr, err := l.Search(searchRequest)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return nil
+	}
+
+	if len(sr.Entries) != 1 {
+		http.Error(w, fmt.Sprintf("Unable to find entry for %s", login_info.DN), http.StatusInternalServerError)
+		return nil
+	}
+
+	loginStatus.UserEntry = sr.Entries[0]
+
+	loginStatus.CanAdmin = strings.EqualFold(loginStatus.Info.DN, config.AdminAccount)
+	loginStatus.CanInvite = false
+
+	groups := []EntryName{}
+	searchRequest = ldap.NewSearchRequest(
+		config.GroupBaseDN,
+		ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
+		fmt.Sprintf("(&(objectClass=groupOfNames)(member=%s))", login_info.DN),
+		[]string{"dn", "displayName", "cn", "description"},
+		nil)
+	// // log.Printf(fmt.Sprintf("708: %v",searchRequest))
+	sr, err = l.Search(searchRequest)
+	// if err != nil {
+	// 	http.Error(w, err.Error(), http.StatusInternalServerError)
+	// 	return
+	// }
+	//// log.Printf(fmt.Sprintf("303: %v",sr.Entries))
+	for _, ent := range sr.Entries {
+		// log.Printf(fmt.Sprintf("305: %v",ent.DN))
+		groups = append(groups, EntryName{
+			DN:   ent.DN,
+			Name: ent.GetAttributeValue("cn"),
+		})
+		// log.Printf(fmt.Sprintf("310: %v",config.GroupCanInvite))
+		if config.GroupCanInvite != "" && strings.EqualFold(ent.DN, config.GroupCanInvite) {
+			loginStatus.CanInvite = true
+		}
+		// log.Printf(fmt.Sprintf("314: %v",config.GroupCanAdmin))
+		if config.GroupCanAdmin != "" && strings.EqualFold(ent.DN, config.GroupCanAdmin) {
+			loginStatus.CanAdmin = true
+		}
+	}
+
+	// for _, attr := range loginStatus.UserEntry.Attributes {
+	// 	if strings.EqualFold(attr.Name, "memberof") {
+	// 		for _, group := range attr.Values {
+	// 			if config.GroupCanInvite != "" && strings.EqualFold(group, config.GroupCanInvite) {
+	// 				loginStatus.CanInvite = true
+	// 			}
+	// 			if config.GroupCanAdmin != "" && strings.EqualFold(group, config.GroupCanAdmin) {
+	// 				loginStatus.CanAdmin = true
+	// 			}
+	// 		}
+	// 	}
+	// }
+
+	return loginStatus
+}
+
+func handleLogout(w http.ResponseWriter, r *http.Request) {
+	session, err := store.Get(r, SESSION_NAME)
+	if err != nil {
+		session, _ = store.New(r, SESSION_NAME)
+	}
+
+	delete(session.Values, "login_username")
+	delete(session.Values, "login_password")
+	delete(session.Values, "login_dn")
+
+	err = session.Save(r, w)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	http.Redirect(w, r, "/", http.StatusFound)
+}
+
+type LoginFormData struct {
+	Username     string
+	WrongUser    bool
+	WrongPass    bool
+	ErrorMessage string
+}
+
+func handleLogin(w http.ResponseWriter, r *http.Request) *LoginInfo {
+	templateLogin := getTemplate("login.html")
+
+	if r.Method == "GET" {
+		templateLogin.Execute(w, LoginFormData{})
+		return nil
+	} else if r.Method == "POST" {
+		r.ParseForm()
+
+		username := strings.Join(r.Form["username"], "")
+		password := strings.Join(r.Form["password"], "")
+		user_dn := fmt.Sprintf("%s=%s,%s", config.UserNameAttr, username, config.UserBaseDN)
+		if strings.EqualFold(username, config.AdminAccount) {
+			user_dn = username
+		}
+
+		l := ldapOpen(w)
+		if l == nil {
+			return nil
+		}
+
+		err := l.Bind(user_dn, password)
+		if err != nil {
+			data := &LoginFormData{
+				Username: username,
+			}
+			if ldap.IsErrorWithCode(err, ldap.LDAPResultInvalidCredentials) {
+				data.WrongPass = true
+			} else if ldap.IsErrorWithCode(err, ldap.LDAPResultNoSuchObject) {
+				data.WrongUser = true
+			} else {
+				data.ErrorMessage = err.Error()
+			}
+			templateLogin.Execute(w, data)
+			return nil
+		}
+
+		// Successfully logged in, save it to session
+		session, err := store.Get(r, SESSION_NAME)
+		if err != nil {
+			session, _ = store.New(r, SESSION_NAME)
+		}
+
+		session.Values["login_username"] = username
+		session.Values["login_password"] = password
+		session.Values["login_dn"] = user_dn
+
+		err = session.Save(r, w)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return nil
+		}
+
+		return &LoginInfo{
+			DN:       user_dn,
+			Username: username,
+			Password: password,
+		}
+	} else {
+		http.Error(w, "Unsupported method", http.StatusBadRequest)
+		return nil
+	}
+}