cc-backend/auth/auth.go

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package auth
import (
"context"
"crypto/ed25519"
"crypto/rand"
"database/sql"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"log"
"net/http"
"os"
"strings"
"github.com/ClusterCockpit/cc-jobarchive/templates"
sq "github.com/Masterminds/squirrel"
"github.com/golang-jwt/jwt/v4"
"github.com/gorilla/sessions"
"github.com/jmoiron/sqlx"
"golang.org/x/crypto/bcrypt"
)
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// TODO: Properly do this "roles" stuff.
// Add a roles array and `user.HasRole(...)` functions.
type User struct {
Username string
Password string
Name string
IsAdmin bool
IsAPIUser bool
ViaLdap bool
Email string
}
type ContextKey string
const ContextUserKey ContextKey = "user"
var JwtPublicKey ed25519.PublicKey
var JwtPrivateKey ed25519.PrivateKey
var sessionStore *sessions.CookieStore
func Init(db *sqlx.DB, ldapConfig *LdapConfig) error {
_, err := db.Exec(`
CREATE TABLE IF NOT EXISTS user (
username varchar(255) PRIMARY KEY,
password varchar(255) DEFAULT NULL,
ldap tinyint DEFAULT 0,
name varchar(255) DEFAULT NULL,
roles varchar(255) DEFAULT NULL,
email varchar(255) DEFAULT NULL);`)
if err != nil {
return err
}
sessKey := os.Getenv("SESSION_KEY")
if sessKey == "" {
log.Println("warning: environment variable 'SESSION_KEY' not set (will use non-persistent random key)")
bytes := make([]byte, 32)
if _, err := rand.Read(bytes); err != nil {
return err
}
sessionStore = sessions.NewCookieStore(bytes)
} else {
bytes, err := base64.StdEncoding.DecodeString(sessKey)
if err != nil {
return err
}
sessionStore = sessions.NewCookieStore(bytes)
}
pubKey, privKey := os.Getenv("JWT_PUBLIC_KEY"), os.Getenv("JWT_PRIVATE_KEY")
if pubKey == "" || privKey == "" {
log.Println("warning: environment variables 'JWT_PUBLIC_KEY' or 'JWT_PRIVATE_KEY' not set (token based authentication will not work)")
} else {
bytes, err := base64.StdEncoding.DecodeString(pubKey)
if err != nil {
return err
}
JwtPublicKey = ed25519.PublicKey(bytes)
bytes, err = base64.StdEncoding.DecodeString(privKey)
if err != nil {
return err
}
JwtPrivateKey = ed25519.PrivateKey(bytes)
}
if ldapConfig != nil {
if err := initLdap(ldapConfig); err != nil {
return err
}
}
return nil
}
// arg must be formated like this: "<username>:[admin]:<password>"
func AddUserToDB(db *sqlx.DB, arg string) error {
parts := strings.SplitN(arg, ":", 3)
if len(parts) != 3 || len(parts[0]) == 0 || len(parts[2]) == 0 || !(len(parts[1]) == 0 || parts[1] == "admin") {
return errors.New("invalid argument format")
}
password, err := bcrypt.GenerateFromPassword([]byte(parts[2]), bcrypt.DefaultCost)
if err != nil {
return err
}
roles := "[]"
if parts[1] == "admin" {
roles = "[\"ROLE_ADMIN\"]"
}
if parts[1] == "api" {
roles = "[\"ROLE_API\"]"
}
_, err = sq.Insert("user").Columns("username", "password", "roles").Values(parts[0], string(password), roles).RunWith(db).Exec()
if err != nil {
return err
}
log.Printf("new user '%s' added (roles: %s)\n", parts[0], roles)
return nil
}
func DelUserFromDB(db *sqlx.DB, username string) error {
_, err := db.Exec(`DELETE FROM user WHERE user.username = ?`, username)
return err
}
func FetchUserFromDB(db *sqlx.DB, username string) (*User, error) {
user := &User{Username: username}
var hashedPassword, name, rawRoles, email sql.NullString
if err := sq.Select("password", "ldap", "name", "roles", "email").From("user").
Where("user.username = ?", username).RunWith(db).
QueryRow().Scan(&hashedPassword, &user.ViaLdap, &name, &rawRoles, &email); err != nil {
return nil, fmt.Errorf("user '%s' not found (%s)", username, err.Error())
}
user.Password = hashedPassword.String
user.Name = name.String
user.Email = email.String
var roles []string
if rawRoles.Valid {
json.Unmarshal([]byte(rawRoles.String), &roles)
}
for _, role := range roles {
switch role {
case "ROLE_ADMIN":
user.IsAdmin = true
case "ROLE_API":
user.IsAPIUser = true
}
}
return user, nil
}
// Handle a POST request that should log the user in,
// starting a new session.
func Login(db *sqlx.DB) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
username, password := r.FormValue("username"), r.FormValue("password")
user, err := FetchUserFromDB(db, username)
if err == nil && user.ViaLdap && ldapAuthEnabled {
err = loginViaLdap(user, password)
} else if err == nil && !user.ViaLdap && user.Password != "" {
if e := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(password)); e != nil {
err = fmt.Errorf("user '%s' provided the wrong password (%s)", username, e.Error())
}
} else {
err = errors.New("could not authenticate user")
}
if err != nil {
log.Printf("login failed: %s\n", err.Error())
rw.WriteHeader(http.StatusUnauthorized)
templates.Render(rw, r, "login.html", &templates.Page{
Title: "Login failed",
Login: &templates.LoginPage{
Error: "Username or password incorrect",
},
})
return
}
session, err := sessionStore.New(r, "session")
if err != nil {
log.Printf("session creation failed: %s\n", err.Error())
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
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session.Options.MaxAge = 30 * 24 * 60 * 60
session.Values["username"] = user.Username
session.Values["is_admin"] = user.IsAdmin
if err := sessionStore.Save(r, rw, session); err != nil {
log.Printf("session save failed: %s\n", err.Error())
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
log.Printf("login successfull: user: %#v\n", user)
http.Redirect(rw, r, "/", http.StatusTemporaryRedirect)
})
}
var ErrTokenInvalid error = errors.New("invalid token")
func authViaToken(r *http.Request) (*User, error) {
if JwtPublicKey == nil {
return nil, nil
}
rawtoken := r.Header.Get("X-Auth-Token")
if rawtoken == "" {
rawtoken = r.Header.Get("Authorization")
prefix := "Bearer "
if !strings.HasPrefix(rawtoken, prefix) {
return nil, nil
}
rawtoken = rawtoken[len(prefix):]
}
token, err := jwt.Parse(rawtoken, func(t *jwt.Token) (interface{}, error) {
if t.Method != jwt.SigningMethodEdDSA {
return nil, errors.New("only Ed25519/EdDSA supported")
}
return JwtPublicKey, nil
})
if err != nil {
return nil, ErrTokenInvalid
}
if err := token.Claims.Valid(); err != nil {
return nil, ErrTokenInvalid
}
claims := token.Claims.(jwt.MapClaims)
sub, _ := claims["sub"].(string)
isAdmin, _ := claims["is_admin"].(bool)
isAPIUser, _ := claims["is_api"].(bool)
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// TODO: Check if sub is still a valid user!
return &User{
Username: sub,
IsAdmin: isAdmin,
IsAPIUser: isAPIUser,
}, nil
}
// Authenticate the user and put a User object in the
// context of the request. If authentication fails,
// do not continue but send client to the login screen.
func Auth(next http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
user, err := authViaToken(r)
if err == ErrTokenInvalid {
log.Printf("authentication failed: invalid token\n")
http.Error(rw, err.Error(), http.StatusUnauthorized)
return
}
if user != nil {
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// Successfull authentication using a token
ctx := context.WithValue(r.Context(), ContextUserKey, user)
next.ServeHTTP(rw, r.WithContext(ctx))
return
}
session, err := sessionStore.Get(r, "session")
if err != nil {
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// sessionStore.Get will return a new session if no current one is attached to this request.
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
if session.IsNew {
log.Printf("authentication failed: no session or jwt found\n")
rw.WriteHeader(http.StatusUnauthorized)
templates.Render(rw, r, "login.html", &templates.Page{
Title: "Authentication failed",
Login: &templates.LoginPage{
Error: "No valid session or JWT provided",
},
})
return
}
ctx := context.WithValue(r.Context(), ContextUserKey, &User{
Username: session.Values["username"].(string),
IsAdmin: session.Values["is_admin"].(bool),
})
next.ServeHTTP(rw, r.WithContext(ctx))
})
}
// Generate a new JWT that can be used for authentication
func ProvideJWT(user *User) (string, error) {
if JwtPrivateKey == nil {
return "", errors.New("environment variable 'JWT_PUBLIC_KEY' not set")
}
tok := jwt.NewWithClaims(jwt.SigningMethodEdDSA, jwt.MapClaims{
"sub": user.Username,
"is_admin": user.IsAdmin,
"is_api": user.IsAPIUser,
})
return tok.SignedString(JwtPrivateKey)
}
func GetUser(ctx context.Context) *User {
x := ctx.Value(ContextUserKey)
if x == nil {
return nil
}
return x.(*User)
}
// Clears the session cookie
func Logout(rw http.ResponseWriter, r *http.Request) {
session, err := sessionStore.Get(r, "session")
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
if !session.IsNew {
session.Options.MaxAge = -1
if err := sessionStore.Save(r, rw, session); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
}
templates.Render(rw, r, "login.html", &templates.Page{
Title: "Logout successful",
Login: &templates.LoginPage{
Info: "Logout successful",
},
})
}