gosora/auth.go

185 lines
5.4 KiB
Go

/*
*
* Gosora Authentication Interface
* Copyright Azareal 2017 - 2018
*
*/
package main
import "log"
import "errors"
import "strconv"
import "net/http"
import "database/sql"
import "./query_gen/lib"
import "golang.org/x/crypto/bcrypt"
var auth Auth
// ErrMismatchedHashAndPassword is thrown whenever a hash doesn't match it's unhashed password
var ErrMismatchedHashAndPassword = bcrypt.ErrMismatchedHashAndPassword
// nolint
// ErrPasswordTooLong is silly, but we don't want bcrypt to bork on us
var ErrPasswordTooLong = errors.New("The password you selected is too long")
var ErrWrongPassword = errors.New("That's not the correct password.")
var ErrSecretError = errors.New("There was a glitch in the system. Please contact your local administrator.")
var ErrNoUserByName = errors.New("We couldn't find an account with that username.")
// Auth is the main authentication interface.
type Auth interface {
Authenticate(username string, password string) (uid int, err error)
Logout(w http.ResponseWriter, uid int)
ForceLogout(uid int) error
SetCookies(w http.ResponseWriter, uid int, session string)
GetCookies(r *http.Request) (uid int, session string, err error)
SessionCheck(w http.ResponseWriter, r *http.Request) (user *User, halt bool)
CreateSession(uid int) (session string, err error)
}
// DefaultAuth is the default authenticator used by Gosora, may be swapped with an alternate authenticator in some situations. E.g. To support LDAP.
type DefaultAuth struct {
login *sql.Stmt
logout *sql.Stmt
}
// NewDefaultAuth is a factory for spitting out DefaultAuths
func NewDefaultAuth() *DefaultAuth {
loginStmt, err := qgen.Builder.SimpleSelect("users", "uid, password, salt", "name = ?", "", "")
if err != nil {
log.Fatal(err)
}
logoutStmt, err := qgen.Builder.SimpleUpdate("users", "session = ''", "uid = ?")
if err != nil {
log.Fatal(err)
}
return &DefaultAuth{
login: loginStmt,
logout: logoutStmt,
}
}
// Authenticate checks if a specific username and password is valid and returns the UID for the corresponding user, if so. Otherwise, a user safe error.
func (auth *DefaultAuth) Authenticate(username string, password string) (uid int, err error) {
var realPassword, salt string
err = auth.login.QueryRow(username).Scan(&uid, &realPassword, &salt)
if err == ErrNoRows {
return 0, ErrNoUserByName
} else if err != nil {
LogError(err)
return 0, ErrSecretError
}
if salt == "" {
// Send an email to admin for this?
LogError(errors.New("Missing salt for user #" + strconv.Itoa(uid) + ". Potential security breach."))
return 0, ErrSecretError
}
err = CheckPassword(realPassword, password, salt)
if err == ErrMismatchedHashAndPassword {
return 0, ErrWrongPassword
} else if err != nil {
LogError(err)
return 0, ErrSecretError
}
return uid, nil
}
// ForceLogout logs the user out of every computer, not just the one they logged out of
func (auth *DefaultAuth) ForceLogout(uid int) error {
_, err := auth.logout.Exec(uid)
if err != nil {
LogError(err)
return ErrSecretError
}
// Flush the user out of the cache
ucache, ok := users.(UserCache)
if ok {
ucache.CacheRemove(uid)
}
return nil
}
// Logout logs you out of the computer you requested the logout for, but not the other computers you're logged in with
func (auth *DefaultAuth) Logout(w http.ResponseWriter, _ int) {
cookie := http.Cookie{Name: "uid", Value: "", Path: "/", MaxAge: year}
http.SetCookie(w, &cookie)
cookie = http.Cookie{Name: "session", Value: "", Path: "/", MaxAge: year}
http.SetCookie(w, &cookie)
}
// TODO: Set the cookie domain
// SetCookies sets the two cookies required for the current user to be recognised as a specific user in future requests
func (auth *DefaultAuth) SetCookies(w http.ResponseWriter, uid int, session string) {
cookie := http.Cookie{Name: "uid", Value: strconv.Itoa(uid), Path: "/", MaxAge: year}
http.SetCookie(w, &cookie)
cookie = http.Cookie{Name: "session", Value: session, Path: "/", MaxAge: year}
http.SetCookie(w, &cookie)
}
// GetCookies fetches the current user's session cookies
func (auth *DefaultAuth) GetCookies(r *http.Request) (uid int, session string, err error) {
// Are there any session cookies..?
cookie, err := r.Cookie("uid")
if err != nil {
return 0, "", err
}
uid, err = strconv.Atoi(cookie.Value)
if err != nil {
return 0, "", err
}
cookie, err = r.Cookie("session")
if err != nil {
return 0, "", err
}
return uid, cookie.Value, err
}
// SessionCheck checks if a user has session cookies and whether they're valid
func (auth *DefaultAuth) SessionCheck(w http.ResponseWriter, r *http.Request) (user *User, halt bool) {
uid, session, err := auth.GetCookies(r)
if err != nil {
return &guestUser, false
}
// Is this session valid..?
user, err = users.Get(uid)
if err == ErrNoRows {
return &guestUser, false
} else if err != nil {
InternalError(err, w)
return &guestUser, true
}
if user.Session == "" || session != user.Session {
return &guestUser, false
}
return user, false
}
// CreateSession generates a new session to allow a remote client to stay logged in as a specific user
func (auth *DefaultAuth) CreateSession(uid int) (session string, err error) {
session, err = GenerateSafeString(sessionLength)
if err != nil {
return "", err
}
_, err = updateSessionStmt.Exec(session, uid)
if err != nil {
return "", err
}
// Flush the user data from the cache
ucache, ok := users.(UserCache)
if ok {
ucache.CacheRemove(uid)
}
return session, nil
}