refactor auth module

Restructure module
Separate JWT auth variants
Cleanup code
Fixes #189

docs/dev-authentication.md

@@ -1,13 +1,15 @@
 # Overview
 
-The implementation of authentication is not easy to understand by just looking
+The authentication is implemented in `internal/auth/`. In `auth.go`
-at the code. The authentication is implemented in `internal/auth/`. In `auth.go`
 an interface is defined that any authentication provider must fulfill. It also
 acts as a dispatcher to delegate the calls to the available authentication
 providers.
 
-The most important routine are:
+Two authentication types are available:
-* `CanLogin()` Check if the authentication method is supported for login attempt
+* JWT authentication for the REST API that does not create a session cookie
+* Session based authentication using a session cookie
+
+The most important routines in auth are:
 * `Login()` Handle POST request to login user and start a new session
 * `Auth()`  Authenticate user and put User Object in context of the request
 
@@ -30,10 +32,9 @@ secured.Use(func(next http.Handler) http.Handler {
 })
 ```
 
-For non API routes a JWT token can be used to initiate an authenticated user
+A JWT token can be used to initiate an authenticated user
 session. This can either happen by calling the login route with a token
-provided in a header or query URL or via the `Auth()` method on first access
+provided in a header or via a special cookie containing the JWT token.
-to a secured URL via a special cookie containing the JWT token.
 For API routes the access is authenticated on every request using the JWT token
 and no session is initiated.
 
@@ -43,12 +44,13 @@ The Login function (located in `auth.go`):
 * Extracts the user name and gets the user from the user database table. In case the
   user is not found the user object is set to nil.
 * Iterates over all authenticators and:
-  - Calls the `CanLogin` function which checks if the authentication method is
+  - Calls its `CanLogin` function which checks if the authentication method is
-    supported for this user and the user object is valid.
+    supported for this user.
-  - Calls the `Login` function to authenticate the user. On success a valid user
+  - Calls its `Login` function to authenticate the user. On success a valid user
     object is returned.
   - Creates a new session object, stores the user attributes in the session and
     saves the session.
+  - If the user does not yet exist in the database try to add the user
   - Starts the `onSuccess` http handler
 
 ## Local authenticator
@@ -82,17 +84,13 @@ if err := l.Bind(userDn, r.FormValue("password")); err != nil {
 }
 ```
 
-## JWT authenticator
+## JWT Session authenticator
 
 Login via JWT token will create a session without password.
-For login the `X-Auth-Token` header is not supported.
+For login the `X-Auth-Token` header is not supported. This authenticator is
-This authenticator is applied if either user is not nil and auth source is
+applied if the Authorization header is present:
-`AuthViaToken` or the Authorization header is present or the URL query key
-login-token is present:
 ```
-return (user != nil && user.AuthSource == AuthViaToken) ||
+	return r.Header.Get("Authorization") != ""
-        r.Header.Get("Authorization") != "" ||
-        r.URL.Query().Get("login-token") != ""
 ```
 
 The Login function:
@@ -108,6 +106,25 @@ The Login function:
    - In case user is not yet present add user to user database table with `AuthViaToken` AuthSource.
 * Return valid user object
 
+## JWT Cookie Session authenticator
+
+Login via JWT cookie token will create a session without password.
+It is first checked if the required configuration keys are set:
+* `publicKeyCrossLogin`
+* `TrustedExternalIssuer`
+* `CookieName`
+
+ This authenticator is applied if the configured cookie is present:
+```
+	jwtCookie, err := r.Cookie(cookieName)
+
+	if err == nil && jwtCookie.Value != "" {
+		return true
+	}
+```
+
+The Login function:
+
 # Auth
 
 The Auth function (located in `auth.go`):

internal/auth/auth.go

@@ -1,4 +1,4 @@
-// Copyright (C) 2022 NHR@FAU, University Erlangen-Nuremberg.
+// Copyright (C) 2023 NHR@FAU, University Erlangen-Nuremberg.
 // All rights reserved.
 // Use of this source code is governed by a MIT-style
 // license that can be found in the LICENSE file.
@@ -7,12 +7,11 @@ package auth
 import (
 	"context"
 	"crypto/rand"
+	"database/sql"
 	"encoding/base64"
 	"errors"
-	"fmt"
 	"net/http"
 	"os"
-	"strings"
 	"time"
 
 	"github.com/ClusterCockpit/cc-backend/pkg/log"
@@ -28,172 +27,25 @@ const (
 	AuthViaToken
 )
 
+type AuthType int
+
+const (
+	AuthToken AuthType = iota
+	AuthSession
+)
+
 type User struct {
 	Username   string     `json:"username"`
 	Password   string     `json:"-"`
 	Name       string     `json:"name"`
 	Roles      []string   `json:"roles"`
-	AuthSource AuthSource `json:"via"`
+	AuthType   AuthType   `json:"authType"`
+	AuthSource AuthSource `json:"authSource"`
 	Email      string     `json:"email"`
 	Projects   []string   `json:"projects"`
 	Expiration time.Time
 }
 
-type Role int
-
-const (
-	RoleAnonymous Role = iota
-	RoleApi
-	RoleUser
-	RoleManager
-	RoleSupport
-	RoleAdmin
-	RoleError
-)
-
-func GetRoleString(roleInt Role) string {
-	return [6]string{"anonymous", "api", "user", "manager", "support", "admin"}[roleInt]
-}
-
-func getRoleEnum(roleStr string) Role {
-	switch strings.ToLower(roleStr) {
-	case "admin":
-		return RoleAdmin
-	case "support":
-		return RoleSupport
-	case "manager":
-		return RoleManager
-	case "user":
-		return RoleUser
-	case "api":
-		return RoleApi
-	case "anonymous":
-		return RoleAnonymous
-	default:
-		return RoleError
-	}
-}
-
-func isValidRole(role string) bool {
-	return getRoleEnum(role) != RoleError
-}
-
-func (u *User) HasValidRole(role string) (hasRole bool, isValid bool) {
-	if isValidRole(role) {
-		for _, r := range u.Roles {
-			if r == role {
-				return true, true
-			}
-		}
-		return false, true
-	}
-	return false, false
-}
-
-func (u *User) HasRole(role Role) bool {
-	for _, r := range u.Roles {
-		if r == GetRoleString(role) {
-			return true
-		}
-	}
-	return false
-}
-
-// Role-Arrays are short: performance not impacted by nested loop
-func (u *User) HasAnyRole(queryroles []Role) bool {
-	for _, ur := range u.Roles {
-		for _, qr := range queryroles {
-			if ur == GetRoleString(qr) {
-				return true
-			}
-		}
-	}
-	return false
-}
-
-// Role-Arrays are short: performance not impacted by nested loop
-func (u *User) HasAllRoles(queryroles []Role) bool {
-	target := len(queryroles)
-	matches := 0
-	for _, ur := range u.Roles {
-		for _, qr := range queryroles {
-			if ur == GetRoleString(qr) {
-				matches += 1
-				break
-			}
-		}
-	}
-
-	if matches == target {
-		return true
-	} else {
-		return false
-	}
-}
-
-// Role-Arrays are short: performance not impacted by nested loop
-func (u *User) HasNotRoles(queryroles []Role) bool {
-	matches := 0
-	for _, ur := range u.Roles {
-		for _, qr := range queryroles {
-			if ur == GetRoleString(qr) {
-				matches += 1
-				break
-			}
-		}
-	}
-
-	if matches == 0 {
-		return true
-	} else {
-		return false
-	}
-}
-
-// Called by API endpoint '/roles/' from frontend: Only required for admin config -> Check Admin Role
-func GetValidRoles(user *User) ([]string, error) {
-	var vals []string
-	if user.HasRole(RoleAdmin) {
-		for i := RoleApi; i < RoleError; i++ {
-			vals = append(vals, GetRoleString(i))
-		}
-		return vals, nil
-	}
-
-	return vals, fmt.Errorf("%s: only admins are allowed to fetch a list of roles", user.Username)
-}
-
-// Called by routerConfig web.page setup in backend: Only requires known user
-func GetValidRolesMap(user *User) (map[string]Role, error) {
-	named := make(map[string]Role)
-	if user.HasNotRoles([]Role{RoleAnonymous}) {
-		for i := RoleApi; i < RoleError; i++ {
-			named[GetRoleString(i)] = i
-		}
-		return named, nil
-	}
-	return named, fmt.Errorf("only known users are allowed to fetch a list of roles")
-}
-
-// Find highest role
-func (u *User) GetAuthLevel() Role {
-	if u.HasRole(RoleAdmin) {
-		return RoleAdmin
-	} else if u.HasRole(RoleSupport) {
-		return RoleSupport
-	} else if u.HasRole(RoleManager) {
-		return RoleManager
-	} else if u.HasRole(RoleUser) {
-		return RoleUser
-	} else if u.HasRole(RoleApi) {
-		return RoleApi
-	} else if u.HasRole(RoleAnonymous) {
-		return RoleAnonymous
-	} else {
-		return RoleError
-	}
-}
-
 func (u *User) HasProject(project string) bool {
 	for _, p := range u.Projects {
 		if p == project {
@@ -216,7 +68,6 @@ type Authenticator interface {
 	Init(auth *Authentication, config interface{}) error
 	CanLogin(user *User, rw http.ResponseWriter, r *http.Request) bool
 	Login(user *User, rw http.ResponseWriter, r *http.Request) (*User, error)
-	Auth(rw http.ResponseWriter, r *http.Request) (*User, error)
 }
 
 type ContextKey string
@@ -234,6 +85,47 @@ type Authentication struct {
 	LocalAuth      *LocalAuthenticator
 }
 
+func (auth *Authentication) AuthViaSession(
+	rw http.ResponseWriter,
+	r *http.Request) (*User, error) {
+	session, err := auth.sessionStore.Get(r, "session")
+	if err != nil {
+		log.Error("Error while getting session store")
+		return nil, err
+	}
+
+	if session.IsNew {
+		return nil, nil
+	}
+
+	var username string
+	var projects, roles []string
+
+	if val, ok := session.Values["username"]; ok {
+		username, _ = val.(string)
+	} else {
+		return nil, errors.New("No key username in session")
+	}
+	if val, ok := session.Values["projects"]; ok {
+		projects, _ = val.([]string)
+	} else {
+		return nil, errors.New("No key projects in session")
+	}
+	if val, ok := session.Values["projects"]; ok {
+		roles, _ = val.([]string)
+	} else {
+		return nil, errors.New("No key roles in session")
+	}
+
+	return &User{
+		Username:   username,
+		Projects:   projects,
+		Roles:      roles,
+		AuthType:   AuthSession,
+		AuthSource: -1,
+	}, nil
+}
+
 func Init(db *sqlx.DB,
 	configs map[string]interface{}) (*Authentication, error) {
 	auth := &Authentication{}
@@ -257,19 +149,11 @@ func Init(db *sqlx.DB,
 		auth.sessionStore = sessions.NewCookieStore(bytes)
 	}
 
-	auth.LocalAuth = &LocalAuthenticator{}
-	if err := auth.LocalAuth.Init(auth, nil); err != nil {
-		log.Error("Error while initializing authentication -> localAuth init failed")
-		return nil, err
-	}
-	auth.authenticators = append(auth.authenticators, auth.LocalAuth)
-
 	auth.JwtAuth = &JWTAuthenticator{}
 	if err := auth.JwtAuth.Init(auth, configs["jwt"]); err != nil {
 		log.Error("Error while initializing authentication -> jwtAuth init failed")
 		return nil, err
 	}
-	auth.authenticators = append(auth.authenticators, auth.JwtAuth)
 
 	if config, ok := configs["ldap"]; ok {
 		auth.LdapAuth = &LdapAuthenticator{}
@@ -280,36 +164,30 @@ func Init(db *sqlx.DB,
 		auth.authenticators = append(auth.authenticators, auth.LdapAuth)
 	}
 
+	jwtSessionAuth := &JWTSessionAuthenticator{}
+	if err := jwtSessionAuth.Init(auth, configs["jwt"]); err != nil {
+		log.Warn("Error while initializing authentication -> jwtSessionAuth init failed")
+	} else {
+		auth.authenticators = append(auth.authenticators, jwtSessionAuth)
+	}
+
+	jwtCookieSessionAuth := &JWTCookieSessionAuthenticator{}
+	if err := jwtSessionAuth.Init(auth, configs["jwt"]); err != nil {
+		log.Warn("Error while initializing authentication -> jwtCookieSessionAuth init failed")
+	} else {
+		auth.authenticators = append(auth.authenticators, jwtCookieSessionAuth)
+	}
+
+	auth.LocalAuth = &LocalAuthenticator{}
+	if err := auth.LocalAuth.Init(auth, nil); err != nil {
+		log.Error("Error while initializing authentication -> localAuth init failed")
+		return nil, err
+	}
+	auth.authenticators = append(auth.authenticators, auth.LocalAuth)
+
 	return auth, nil
 }
 
-func (auth *Authentication) AuthViaSession(
-	rw http.ResponseWriter,
-	r *http.Request) (*User, error) {
-
-	session, err := auth.sessionStore.Get(r, "session")
-	if err != nil {
-		log.Error("Error while getting session store")
-		return nil, err
-	}
-
-	if session.IsNew {
-		return nil, nil
-	}
-
-	// TODO Check if keys are present in session?
-	username, _ := session.Values["username"].(string)
-	projects, _ := session.Values["projects"].([]string)
-	roles, _ := session.Values["roles"].([]string)
-	return &User{
-		Username:   username,
-		Projects:   projects,
-		Roles:      roles,
-		AuthSource: -1,
-	}, nil
-}
-
-// Handle a POST request that should log the user in, starting a new session.
 func (auth *Authentication) Login(
 	onsuccess http.Handler,
 	onfailure func(rw http.ResponseWriter, r *http.Request, loginErr error)) http.Handler {
@@ -317,18 +195,21 @@ func (auth *Authentication) Login(
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 		err := errors.New("no authenticator applied")
 		username := r.FormValue("username")
-		user := (*User)(nil)
+		dbUser := (*User)(nil)
 
 		if username != "" {
-			user, _ = auth.GetUser(username)
+			dbUser, err = auth.GetUser(username)
+			if err != nil && err != sql.ErrNoRows {
+				log.Errorf("Error while loading user '%v'", username)
+			}
 		}
 
 		for _, authenticator := range auth.authenticators {
-			if !authenticator.CanLogin(user, rw, r) {
+			if !authenticator.CanLogin(dbUser, rw, r) {
 				continue
 			}
 
-			user, err = authenticator.Login(user, rw, r)
+			user, err := authenticator.Login(dbUser, rw, r)
 			if err != nil {
 				log.Warnf("user login failed: %s", err.Error())
 				onfailure(rw, r, err)
@@ -354,6 +235,14 @@ func (auth *Authentication) Login(
 				return
 			}
 
+			if dbUser == nil {
+				if err := auth.AddUser(user); err != nil {
+					// TODO Add AuthSource
+					log.Errorf("Error while adding user '%v' to auth from XX",
+						user.Username)
+				}
+			}
+
 			log.Infof("login successfull: user: %#v (roles: %v, projects: %v)", user.Username, user.Roles, user.Projects)
 			ctx := context.WithValue(r.Context(), ContextUserKey, user)
 			onsuccess.ServeHTTP(rw, r.WithContext(ctx))
@@ -365,39 +254,34 @@ func (auth *Authentication) Login(
 	})
 }
 
-// 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 *Authentication) Auth(
 	onsuccess http.Handler,
 	onfailure func(rw http.ResponseWriter, r *http.Request, authErr error)) http.Handler {
 
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
-		for _, authenticator := range auth.authenticators {
+
-			user, err := authenticator.Auth(rw, r)
+		user, err := auth.JwtAuth.AuthViaJWT(rw, r)
+		if user == nil {
+			user, err = auth.AuthViaSession(rw, r)
 			if err != nil {
 				log.Infof("authentication failed: %s", err.Error())
 				http.Error(rw, err.Error(), http.StatusUnauthorized)
 				return
 			}
-			if user == nil {
-				continue
 		}
 
+		if user != nil {
 			ctx := context.WithValue(r.Context(), ContextUserKey, user)
 			onsuccess.ServeHTTP(rw, r.WithContext(ctx))
 			return
 		}
 
-		log.Debugf("authentication failed: %s", "no authenticator applied")
+		log.Debug("authentication failed: no authenticator applied")
-		// http.Error(rw, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
+		onfailure(rw, r, errors.New("unauthorized (please login first)"))
-		onfailure(rw, r, errors.New("unauthorized (login first or use a token)"))
 	})
 }
 
-// Clears the session cookie
 func (auth *Authentication) Logout(onsuccess http.Handler) http.Handler {
-
 	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
 		session, err := auth.sessionStore.Get(r, "session")
 		if err != nil {

internal/auth/jwt.go

@@ -6,10 +6,8 @@ package auth
 
 import (
 	"crypto/ed25519"
-	"database/sql"
 	"encoding/base64"
 	"errors"
-	"fmt"
 	"net/http"
 	"os"
 	"strings"
@@ -25,15 +23,9 @@ type JWTAuthenticator struct {
 
 	publicKey  ed25519.PublicKey
 	privateKey ed25519.PrivateKey
-	publicKeyCrossLogin ed25519.PublicKey // For accepting externally generated JWTs
-
-	loginTokenKey []byte // HS256 key
-
 	config     *schema.JWTAuthConfig
 }
 
-var _ Authenticator = (*JWTAuthenticator)(nil)
-
 func (ja *JWTAuthenticator) Init(auth *Authentication, conf interface{}) error {
 
 	ja.auth = auth
@@ -57,128 +49,10 @@ func (ja *JWTAuthenticator) Init(auth *Authentication, conf interface{}) error {
 		ja.privateKey = ed25519.PrivateKey(bytes)
 	}
 
-	if pubKey = os.Getenv("CROSS_LOGIN_JWT_HS512_KEY"); pubKey != "" {
-		bytes, err := base64.StdEncoding.DecodeString(pubKey)
-		if err != nil {
-			log.Warn("Could not decode cross login JWT HS512 key")
-			return err
-		}
-		ja.loginTokenKey = bytes
-	}
-
-	// Look for external public keys
-	pubKeyCrossLogin, keyFound := os.LookupEnv("CROSS_LOGIN_JWT_PUBLIC_KEY")
-	if keyFound && pubKeyCrossLogin != "" {
-		bytes, err := base64.StdEncoding.DecodeString(pubKeyCrossLogin)
-		if err != nil {
-			log.Warn("Could not decode cross login JWT public key")
-			return err
-		}
-		ja.publicKeyCrossLogin = ed25519.PublicKey(bytes)
-
-		// Warn if other necessary settings are not configured
-		if ja.config != nil {
-			if ja.config.CookieName == "" {
-				log.Warn("cookieName for JWTs not configured (cross login via JWT cookie will fail)")
-			}
-			if !ja.config.ForceJWTValidationViaDatabase {
-				log.Warn("forceJWTValidationViaDatabase not set to true: CC will accept users and roles defined in JWTs regardless of its own database!")
-			}
-			if ja.config.TrustedExternalIssuer == "" {
-				log.Warn("trustedExternalIssuer for JWTs not configured (cross login via JWT cookie will fail)")
-			}
-		} else {
-			log.Warn("cookieName and trustedExternalIssuer for JWTs not configured (cross login via JWT cookie will fail)")
-		}
-	} else {
-		ja.publicKeyCrossLogin = nil
-		log.Debug("environment variable 'CROSS_LOGIN_JWT_PUBLIC_KEY' not set (cross login token based authentication will not work)")
-	}
-
 	return nil
 }
 
-func (ja *JWTAuthenticator) CanLogin(
+func (ja *JWTAuthenticator) AuthViaJWT(
-	user *User,
-	rw http.ResponseWriter,
-	r *http.Request) bool {
-
-	return (user != nil && user.AuthSource == AuthViaToken) ||
-		r.Header.Get("Authorization") != "" ||
-		r.URL.Query().Get("login-token") != ""
-}
-
-func (ja *JWTAuthenticator) Login(
-	user *User,
-	rw http.ResponseWriter,
-	r *http.Request) (*User, error) {
-
-	rawtoken := strings.TrimPrefix(r.Header.Get("Authorization"), "Bearer ")
-	if rawtoken == "" {
-		rawtoken = r.URL.Query().Get("login-token")
-	}
-
-	token, err := jwt.Parse(rawtoken, func(t *jwt.Token) (interface{}, error) {
-		if t.Method == jwt.SigningMethodEdDSA {
-			return ja.publicKey, nil
-		}
-		if t.Method == jwt.SigningMethodHS256 || t.Method == jwt.SigningMethodHS512 {
-			return ja.loginTokenKey, nil
-		}
-		return nil, fmt.Errorf("AUTH/JWT > unkown signing method for login token: %s (known: HS256, HS512, EdDSA)", t.Method.Alg())
-	})
-	if err != nil {
-		log.Warn("Error while parsing jwt token")
-		return nil, err
-	}
-
-	if err = token.Claims.Valid(); err != nil {
-		log.Warn("jwt token claims are not valid")
-		return nil, err
-	}
-
-	claims := token.Claims.(jwt.MapClaims)
-	sub, _ := claims["sub"].(string)
-	exp, _ := claims["exp"].(float64)
-	var roles []string
-	if rawroles, ok := claims["roles"].([]interface{}); ok {
-		for _, rr := range rawroles {
-			if r, ok := rr.(string); ok {
-				if isValidRole(r) {
-					roles = append(roles, r)
-				}
-			}
-		}
-	}
-	if rawrole, ok := claims["roles"].(string); ok {
-		if isValidRole(rawrole) {
-			roles = append(roles, rawrole)
-		}
-	}
-
-	if user == nil {
-		user, err = ja.auth.GetUser(sub)
-		if err != nil && err != sql.ErrNoRows {
-			log.Errorf("Error while loading user '%v'", sub)
-			return nil, err
-		} else if user == nil {
-			user = &User{
-				Username:   sub,
-				Roles:      roles,
-				AuthSource: AuthViaToken,
-			}
-			if err := ja.auth.AddUser(user); err != nil {
-				log.Errorf("Error while adding user '%v' to auth from token", user.Username)
-				return nil, err
-			}
-		}
-	}
-
-	user.Expiration = time.Unix(int64(exp), 0)
-	return user, nil
-}
-
-func (ja *JWTAuthenticator) Auth(
 	rw http.ResponseWriter,
 	r *http.Request) (*User, error) {
 
@@ -188,59 +62,17 @@ func (ja *JWTAuthenticator) Auth(
 		rawtoken = strings.TrimPrefix(rawtoken, "Bearer ")
 	}
 
-	// If no auth header was found, check for a certain cookie containing a JWT
-	cookieName := ""
-	cookieFound := false
-	if ja.config != nil && ja.config.CookieName != "" {
-		cookieName = ja.config.CookieName
-	}
-
-	// Try to read the JWT cookie
-	if rawtoken == "" && cookieName != "" {
-		jwtCookie, err := r.Cookie(cookieName)
-
-		if err == nil && jwtCookie.Value != "" {
-			rawtoken = jwtCookie.Value
-			cookieFound = true
-		}
-	}
-
-	// Because a user can also log in via a token, the
-	// session cookie must be checked here as well:
-	if rawtoken == "" {
-		return ja.auth.AuthViaSession(rw, r)
-	}
-
-	// Try to parse JWT
 	token, err := jwt.Parse(rawtoken, func(t *jwt.Token) (interface{}, error) {
 		if t.Method != jwt.SigningMethodEdDSA {
 			return nil, errors.New("only Ed25519/EdDSA supported")
 		}
 
-		// Is there more than one public key?
-		if ja.publicKeyCrossLogin != nil &&
-			ja.config != nil &&
-			ja.config.TrustedExternalIssuer != "" {
-
-			// Determine whether to use the external public key
-			unvalidatedIssuer, success := t.Claims.(jwt.MapClaims)["iss"].(string)
-			if success && unvalidatedIssuer == ja.config.TrustedExternalIssuer {
-				// The (unvalidated) issuer seems to be the expected one,
-				// use public cross login key from config
-				return ja.publicKeyCrossLogin, nil
-			}
-		}
-
-		// No cross login key configured or issuer not expected
-		// Try own key
 		return ja.publicKey, nil
 	})
 	if err != nil {
-		log.Warn("Error while parsing token")
+		log.Warn("Error while parsing JWT token")
 		return nil, err
 	}
-
-	// Check token validity
 	if err := token.Claims.Valid(); err != nil {
 		log.Warn("jwt token claims are not valid")
 		return nil, err
@@ -261,7 +93,6 @@ func (ja *JWTAuthenticator) Auth(
 			log.Warn("Could not find user from JWT in internal database.")
 			return nil, errors.New("unknown user")
 		}
-
 		// Take user roles from database instead of trusting the JWT
 		roles = user.Roles
 	} else {
@@ -275,41 +106,10 @@ func (ja *JWTAuthenticator) Auth(
 		}
 	}
 
-	if cookieFound {
-		// Create a session so that we no longer need the JTW Cookie
-		session, err := ja.auth.sessionStore.New(r, "session")
-		if err != nil {
-			log.Errorf("session creation failed: %s", err.Error())
-			http.Error(rw, err.Error(), http.StatusInternalServerError)
-			return nil, err
-		}
-
-		if ja.auth.SessionMaxAge != 0 {
-			session.Options.MaxAge = int(ja.auth.SessionMaxAge.Seconds())
-		}
-		session.Values["username"] = sub
-		session.Values["roles"] = roles
-
-		if err := ja.auth.sessionStore.Save(r, rw, session); err != nil {
-			log.Warnf("session save failed: %s", err.Error())
-			http.Error(rw, err.Error(), http.StatusInternalServerError)
-			return nil, err
-		}
-
-		// (Ask browser to) Delete JWT cookie
-		deletedCookie := &http.Cookie{
-			Name:     cookieName,
-			Value:    "",
-			Path:     "/",
-			MaxAge:   -1,
-			HttpOnly: true,
-		}
-		http.SetCookie(rw, deletedCookie)
-	}
-
 	return &User{
 		Username:   sub,
 		Roles:      roles,
+		AuthType:   AuthSession,
 		AuthSource: AuthViaToken,
 	}, nil
 }

internal/auth/jwtCookieSession.go

@@ -0,0 +1,224 @@
+// Copyright (C) 2023 NHR@FAU, University Erlangen-Nuremberg.
+// All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+package auth
+
+import (
+	"crypto/ed25519"
+	"encoding/base64"
+	"errors"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
+	"github.com/ClusterCockpit/cc-backend/pkg/schema"
+	"github.com/golang-jwt/jwt/v4"
+)
+
+type JWTCookieSessionAuthenticator struct {
+	auth *Authentication
+
+	publicKey           ed25519.PublicKey
+	privateKey          ed25519.PrivateKey
+	publicKeyCrossLogin ed25519.PublicKey // For accepting externally generated JWTs
+
+	loginTokenKey []byte // HS256 key
+
+	config *schema.JWTAuthConfig
+}
+
+var _ Authenticator = (*JWTCookieSessionAuthenticator)(nil)
+
+func (ja *JWTCookieSessionAuthenticator) Init(auth *Authentication, conf interface{}) error {
+
+	ja.auth = auth
+	ja.config = conf.(*schema.JWTAuthConfig)
+
+	pubKey, privKey := os.Getenv("JWT_PUBLIC_KEY"), os.Getenv("JWT_PRIVATE_KEY")
+	if pubKey == "" || privKey == "" {
+		log.Warn("environment variables 'JWT_PUBLIC_KEY' or 'JWT_PRIVATE_KEY' not set (token based authentication will not work)")
+		return errors.New("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 {
+			log.Warn("Could not decode JWT public key")
+			return err
+		}
+		ja.publicKey = ed25519.PublicKey(bytes)
+		bytes, err = base64.StdEncoding.DecodeString(privKey)
+		if err != nil {
+			log.Warn("Could not decode JWT private key")
+			return err
+		}
+		ja.privateKey = ed25519.PrivateKey(bytes)
+	}
+
+	if pubKey = os.Getenv("CROSS_LOGIN_JWT_HS512_KEY"); pubKey != "" {
+		bytes, err := base64.StdEncoding.DecodeString(pubKey)
+		if err != nil {
+			log.Warn("Could not decode cross login JWT HS512 key")
+			return err
+		}
+		ja.loginTokenKey = bytes
+	}
+
+	// Look for external public keys
+	pubKeyCrossLogin, keyFound := os.LookupEnv("CROSS_LOGIN_JWT_PUBLIC_KEY")
+	if keyFound && pubKeyCrossLogin != "" {
+		bytes, err := base64.StdEncoding.DecodeString(pubKeyCrossLogin)
+		if err != nil {
+			log.Warn("Could not decode cross login JWT public key")
+			return err
+		}
+		ja.publicKeyCrossLogin = ed25519.PublicKey(bytes)
+	} else {
+		ja.publicKeyCrossLogin = nil
+		log.Debug("environment variable 'CROSS_LOGIN_JWT_PUBLIC_KEY' not set (cross login token based authentication will not work)")
+		return errors.New("environment variable 'CROSS_LOGIN_JWT_PUBLIC_KEY' not set (cross login token based authentication will not work)")
+	}
+
+	// Warn if other necessary settings are not configured
+	if ja.config != nil {
+		if ja.config.CookieName == "" {
+			log.Warn("cookieName for JWTs not configured (cross login via JWT cookie will fail)")
+			return errors.New("cookieName for JWTs not configured (cross login via JWT cookie will fail)")
+		}
+		if !ja.config.ForceJWTValidationViaDatabase {
+			log.Warn("forceJWTValidationViaDatabase not set to true: CC will accept users and roles defined in JWTs regardless of its own database!")
+		}
+		if ja.config.TrustedExternalIssuer == "" {
+			log.Warn("trustedExternalIssuer for JWTs not configured (cross login via JWT cookie will fail)")
+			return errors.New("trustedExternalIssuer for JWTs not configured (cross login via JWT cookie will fail)")
+		}
+	} else {
+		log.Warn("config for JWTs not configured (cross login via JWT cookie will fail)")
+		return errors.New("config for JWTs not configured (cross login via JWT cookie will fail)")
+	}
+
+	return nil
+}
+
+func (ja *JWTCookieSessionAuthenticator) CanLogin(
+	user *User,
+	rw http.ResponseWriter,
+	r *http.Request) bool {
+
+	if ja.publicKeyCrossLogin == nil ||
+		ja.config == nil ||
+		ja.config.TrustedExternalIssuer == "" {
+
+		return false
+	}
+
+	cookieName := ""
+	if ja.config != nil && ja.config.CookieName != "" {
+		cookieName = ja.config.CookieName
+	}
+
+	// Try to read the JWT cookie
+	if cookieName != "" {
+		jwtCookie, err := r.Cookie(cookieName)
+
+		if err == nil && jwtCookie.Value != "" {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (ja *JWTCookieSessionAuthenticator) Login(
+	user *User,
+	rw http.ResponseWriter,
+	r *http.Request) (*User, error) {
+
+	jwtCookie, err := r.Cookie(ja.config.CookieName)
+	var rawtoken string
+
+	if err == nil && jwtCookie.Value != "" {
+		rawtoken = jwtCookie.Value
+	}
+
+	token, err := jwt.Parse(rawtoken, func(t *jwt.Token) (interface{}, error) {
+		if t.Method != jwt.SigningMethodEdDSA {
+			return nil, errors.New("only Ed25519/EdDSA supported")
+		}
+
+		unvalidatedIssuer, success := t.Claims.(jwt.MapClaims)["iss"].(string)
+		if success && unvalidatedIssuer == ja.config.TrustedExternalIssuer {
+			// The (unvalidated) issuer seems to be the expected one,
+			// use public cross login key from config
+			return ja.publicKeyCrossLogin, nil
+		}
+
+		// No cross login key configured or issuer not expected
+		// Try own key
+		return ja.publicKey, nil
+	})
+	if err != nil {
+		log.Warn("Error while parsing token")
+		return nil, err
+	}
+
+	// Check token validity and extract paypload
+	if err := token.Claims.Valid(); err != nil {
+		log.Warn("jwt token claims are not valid")
+		return nil, err
+	}
+
+	claims := token.Claims.(jwt.MapClaims)
+	sub, _ := claims["sub"].(string)
+	exp, _ := claims["exp"].(float64)
+
+	var name string
+	if val, ok := claims["name"]; ok {
+		name, _ = val.(string)
+	}
+
+	var roles []string
+
+	if ja.config.ForceJWTValidationViaDatabase {
+		// Deny any logins for unknown usernames
+		if user == nil {
+			log.Warn("Could not find user from JWT in internal database.")
+			return nil, errors.New("unknown user")
+		}
+
+		// Take user roles from database instead of trusting the JWT
+		roles = user.Roles
+	} else {
+		// Extract roles from JWT (if present)
+		if rawroles, ok := claims["roles"].([]interface{}); ok {
+			for _, rr := range rawroles {
+				if r, ok := rr.(string); ok {
+					roles = append(roles, r)
+				}
+			}
+		}
+	}
+
+	// (Ask browser to) Delete JWT cookie
+	deletedCookie := &http.Cookie{
+		Name:     ja.config.CookieName,
+		Value:    "",
+		Path:     "/",
+		MaxAge:   -1,
+		HttpOnly: true,
+	}
+	http.SetCookie(rw, deletedCookie)
+
+	if user == nil {
+		user = &User{
+			Username:   sub,
+			Name:       name,
+			Roles:      roles,
+			AuthType:   AuthSession,
+			AuthSource: AuthViaToken,
+		}
+	}
+
+	user.Expiration = time.Unix(int64(exp), 0)
+	return user, nil
+}

internal/auth/jwtSession.go

@@ -0,0 +1,103 @@
+// Copyright (C) 2022 NHR@FAU, University Erlangen-Nuremberg.
+// All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+package auth
+
+import (
+	"encoding/base64"
+	"fmt"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
+	"github.com/golang-jwt/jwt/v4"
+)
+
+type JWTSessionAuthenticator struct {
+	auth *Authentication
+
+	loginTokenKey []byte // HS256 key
+}
+
+var _ Authenticator = (*JWTSessionAuthenticator)(nil)
+
+func (ja *JWTSessionAuthenticator) Init(auth *Authentication, conf interface{}) error {
+
+	ja.auth = auth
+
+	if pubKey := os.Getenv("CROSS_LOGIN_JWT_HS512_KEY"); pubKey != "" {
+		bytes, err := base64.StdEncoding.DecodeString(pubKey)
+		if err != nil {
+			log.Warn("Could not decode cross login JWT HS512 key")
+			return err
+		}
+		ja.loginTokenKey = bytes
+	}
+
+	return nil
+}
+
+func (ja *JWTSessionAuthenticator) CanLogin(
+	user *User,
+	rw http.ResponseWriter,
+	r *http.Request) bool {
+
+	return r.Header.Get("Authorization") != ""
+}
+
+func (ja *JWTSessionAuthenticator) Login(
+	user *User,
+	rw http.ResponseWriter,
+	r *http.Request) (*User, error) {
+
+	rawtoken := strings.TrimPrefix(r.Header.Get("Authorization"), "Bearer ")
+	token, err := jwt.Parse(rawtoken, func(t *jwt.Token) (interface{}, error) {
+		if t.Method == jwt.SigningMethodHS256 || t.Method == jwt.SigningMethodHS512 {
+			return ja.loginTokenKey, nil
+		}
+		return nil, fmt.Errorf("AUTH/JWT > unkown signing method for login token: %s (known: HS256, HS512, EdDSA)", t.Method.Alg())
+	})
+	if err != nil {
+		log.Warn("Error while parsing jwt token")
+		return nil, err
+	}
+
+	if err = token.Claims.Valid(); err != nil {
+		log.Warn("jwt token claims are not valid")
+		return nil, err
+	}
+
+	claims := token.Claims.(jwt.MapClaims)
+	sub, _ := claims["sub"].(string)
+	exp, _ := claims["exp"].(float64)
+
+	var name string
+	if val, ok := claims["name"]; ok {
+		name, _ = val.(string)
+	}
+
+	var roles []string
+	if rawroles, ok := claims["roles"]; ok {
+		for _, r := range rawroles.([]string) {
+			if isValidRole(r) {
+				roles = append(roles, r)
+			}
+		}
+	}
+
+	if user == nil {
+		user = &User{
+			Username:   sub,
+			Name:       name,
+			Roles:      roles,
+			AuthType:   AuthSession,
+			AuthSource: AuthViaToken,
+		}
+	}
+
+	user.Expiration = time.Unix(int64(exp), 0)
+	return user, nil
+}

internal/auth/ldap.go

@@ -1,4 +1,4 @@
-// Copyright (C) 2022 NHR@FAU, University Erlangen-Nuremberg.
+// Copyright (C) 2023 NHR@FAU, University Erlangen-Nuremberg.
 // All rights reserved.
 // Use of this source code is governed by a MIT-style
 // license that can be found in the LICENSE file.
@@ -93,13 +93,6 @@ func (la *LdapAuthenticator) Login(
 	return user, nil
 }
 
-func (la *LdapAuthenticator) Auth(
-	rw http.ResponseWriter,
-	r *http.Request) (*User, error) {
-
-	return la.auth.AuthViaSession(rw, r)
-}
-
 func (la *LdapAuthenticator) Sync() error {
 
 	const IN_DB int = 1

internal/auth/local.go

@@ -46,10 +46,3 @@ func (la *LocalAuthenticator) Login(
 
 	return user, nil
 }
-
-func (la *LocalAuthenticator) Auth(
-	rw http.ResponseWriter,
-	r *http.Request) (*User, error) {
-
-	return la.auth.AuthViaSession(rw, r)
-}

internal/auth/roles.go

@@ -0,0 +1,165 @@
+// Copyright (C) 2023 NHR@FAU, University Erlangen-Nuremberg.
+// All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+package auth
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Role int
+
+const (
+	RoleAnonymous Role = iota
+	RoleApi
+	RoleUser
+	RoleManager
+	RoleSupport
+	RoleAdmin
+	RoleError
+)
+
+func GetRoleString(roleInt Role) string {
+	return [6]string{"anonymous", "api", "user", "manager", "support", "admin"}[roleInt]
+}
+
+func getRoleEnum(roleStr string) Role {
+	switch strings.ToLower(roleStr) {
+	case "admin":
+		return RoleAdmin
+	case "support":
+		return RoleSupport
+	case "manager":
+		return RoleManager
+	case "user":
+		return RoleUser
+	case "api":
+		return RoleApi
+	case "anonymous":
+		return RoleAnonymous
+	default:
+		return RoleError
+	}
+}
+
+func isValidRole(role string) bool {
+	return getRoleEnum(role) != RoleError
+}
+
+func (u *User) HasValidRole(role string) (hasRole bool, isValid bool) {
+	if isValidRole(role) {
+		for _, r := range u.Roles {
+			if r == role {
+				return true, true
+			}
+		}
+		return false, true
+	}
+	return false, false
+}
+
+func (u *User) HasRole(role Role) bool {
+	for _, r := range u.Roles {
+		if r == GetRoleString(role) {
+			return true
+		}
+	}
+	return false
+}
+
+// Role-Arrays are short: performance not impacted by nested loop
+func (u *User) HasAnyRole(queryroles []Role) bool {
+	for _, ur := range u.Roles {
+		for _, qr := range queryroles {
+			if ur == GetRoleString(qr) {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+// Role-Arrays are short: performance not impacted by nested loop
+func (u *User) HasAllRoles(queryroles []Role) bool {
+	target := len(queryroles)
+	matches := 0
+	for _, ur := range u.Roles {
+		for _, qr := range queryroles {
+			if ur == GetRoleString(qr) {
+				matches += 1
+				break
+			}
+		}
+	}
+
+	if matches == target {
+		return true
+	} else {
+		return false
+	}
+}
+
+// Role-Arrays are short: performance not impacted by nested loop
+func (u *User) HasNotRoles(queryroles []Role) bool {
+	matches := 0
+	for _, ur := range u.Roles {
+		for _, qr := range queryroles {
+			if ur == GetRoleString(qr) {
+				matches += 1
+				break
+			}
+		}
+	}
+
+	if matches == 0 {
+		return true
+	} else {
+		return false
+	}
+}
+
+// Called by API endpoint '/roles/' from frontend: Only required for admin config -> Check Admin Role
+func GetValidRoles(user *User) ([]string, error) {
+	var vals []string
+	if user.HasRole(RoleAdmin) {
+		for i := RoleApi; i < RoleError; i++ {
+			vals = append(vals, GetRoleString(i))
+		}
+		return vals, nil
+	}
+
+	return vals, fmt.Errorf("%s: only admins are allowed to fetch a list of roles", user.Username)
+}
+
+// Called by routerConfig web.page setup in backend: Only requires known user
+func GetValidRolesMap(user *User) (map[string]Role, error) {
+	named := make(map[string]Role)
+	if user.HasNotRoles([]Role{RoleAnonymous}) {
+		for i := RoleApi; i < RoleError; i++ {
+			named[GetRoleString(i)] = i
+		}
+		return named, nil
+	}
+	return named, fmt.Errorf("only known users are allowed to fetch a list of roles")
+}
+
+// Find highest role
+func (u *User) GetAuthLevel() Role {
+	if u.HasRole(RoleAdmin) {
+		return RoleAdmin
+	} else if u.HasRole(RoleSupport) {
+		return RoleSupport
+	} else if u.HasRole(RoleManager) {
+		return RoleManager
+	} else if u.HasRole(RoleUser) {
+		return RoleUser
+	} else if u.HasRole(RoleApi) {
+		return RoleApi
+	} else if u.HasRole(RoleAnonymous) {
+		return RoleAnonymous
+	} else {
+		return RoleError
+	}
+}