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auth_simple.go
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auth_simple.go
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package main
import (
"net/http"
"strings"
"github.com/Luzifer/go_helpers/str"
"golang.org/x/crypto/bcrypt"
yaml "gopkg.in/yaml.v2"
)
func init() {
registerAuthenticator(&authSimple{})
}
type authSimple struct {
EnableBasicAuth bool `yaml:"enable_basic_auth"`
Users map[string]string `yaml:"users"`
Groups map[string][]string `yaml:"groups"`
}
// AuthenticatorID needs to return an unique string to identify
// this special authenticator
func (a authSimple) AuthenticatorID() string { return "simple" }
// Configure loads the configuration for the Authenticator from the
// global config.yaml file which is passed as a byte-slice.
// If no configuration for the Authenticator is supplied the function
// needs to return the errAuthenticatorUnconfigured
func (a *authSimple) Configure(yamlSource []byte) error {
envelope := struct {
Providers struct {
Simple *authSimple `yaml:"simple"`
} `yaml:"providers"`
}{}
if err := yaml.Unmarshal(yamlSource, &envelope); err != nil {
return err
}
if envelope.Providers.Simple == nil {
return errAuthenticatorUnconfigured
}
a.EnableBasicAuth = envelope.Providers.Simple.EnableBasicAuth
a.Users = envelope.Providers.Simple.Users
a.Groups = envelope.Providers.Simple.Groups
return nil
}
// DetectUser is used to detect a user without a login form from
// a cookie, header or other methods
// If no user was detected the errNoValidUserFound needs to be
// returned
func (a authSimple) DetectUser(res http.ResponseWriter, r *http.Request) (string, []string, error) {
var user string
if a.EnableBasicAuth {
if basicUser, basicPass, ok := r.BasicAuth(); ok {
for u, p := range a.Users {
if u != basicUser {
continue
}
if bcrypt.CompareHashAndPassword([]byte(p), []byte(basicPass)) != nil {
continue
}
user = basicUser
}
}
}
if user == "" {
sess, err := cookieStore.Get(r, strings.Join([]string{mainCfg.Cookie.Prefix, a.AuthenticatorID()}, "-"))
if err != nil {
return "", nil, errNoValidUserFound
}
var ok bool
user, ok = sess.Values["user"].(string)
if !ok {
return "", nil, errNoValidUserFound
}
// We had a cookie, lets renew it
sess.Options = mainCfg.GetSessionOpts()
if err := sess.Save(r, res); err != nil {
return "", nil, err
}
}
groups := []string{}
for group, users := range a.Groups {
if str.StringInSlice(user, users) {
groups = append(groups, group)
}
}
return user, groups, nil
}
// Login is called when the user submits the login form and needs
// to authenticate the user or throw an error. If the user has
// successfully logged in the persistent cookie should be written
// in order to use DetectUser for the next login.
// If the user did not login correctly the errNoValidUserFound
// needs to be returned
func (a authSimple) Login(res http.ResponseWriter, r *http.Request) error {
username := r.FormValue(strings.Join([]string{a.AuthenticatorID(), "username"}, "-"))
password := r.FormValue(strings.Join([]string{a.AuthenticatorID(), "password"}, "-"))
for u, p := range a.Users {
if u != username {
continue
}
if bcrypt.CompareHashAndPassword([]byte(p), []byte(password)) != nil {
continue
}
sess, _ := cookieStore.Get(r, strings.Join([]string{mainCfg.Cookie.Prefix, a.AuthenticatorID()}, "-"))
sess.Options = mainCfg.GetSessionOpts()
sess.Values["user"] = u
return sess.Save(r, res)
}
return errNoValidUserFound
}
// LoginFields needs to return the fields required for this login
// method. If no login using this method is possible the function
// needs to return nil.
func (a authSimple) LoginFields() (fields []loginField) {
return []loginField{
{
Label: "Username",
Name: "username",
Placeholder: "Username",
Type: "text",
},
{
Label: "Password",
Name: "password",
Placeholder: "****",
Type: "password",
},
}
}
// Logout is called when the user visits the logout endpoint and
// needs to destroy any persistent stored cookies
func (a authSimple) Logout(res http.ResponseWriter, r *http.Request) (err error) {
sess, _ := cookieStore.Get(r, strings.Join([]string{mainCfg.Cookie.Prefix, a.AuthenticatorID()}, "-"))
sess.Options = mainCfg.GetSessionOpts()
sess.Options.MaxAge = -1 // Instant delete
return sess.Save(r, res)
}