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refactor auth module

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Restructure module
Separate JWT auth variants
Cleanup code
Fixes #189
This commit is contained in:
Jan Eitzinger 2023-08-11 10:00:23 +02:00
parent bc6e6250e1
commit b8273a9b02
9 changed files with 630 additions and 451 deletions
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53
docs/dev-authentication.md
View File

@ -1,13 +1,15 @@
# Overview
The implementation of authentication is not easy to understand by just looking
at the code. The authentication is implemented in `internal/auth/`. In `auth.go`
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:
* `CanLogin()` Check if the authentication method is supported for login attempt
Two authentication types are available:
* 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
to a secured URL via a special cookie containing the JWT token.
provided in a header or 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
supported for this user and the user object is valid.
- Calls the `Login` function to authenticate the user. On success a valid user
- Calls its `CanLogin` function which checks if the authentication method is
supported for this 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.
This authenticator is applied if either user is not nil and auth source is
`AuthViaToken` or the Authorization header is present or the URL query key
login-token is present:
For login the `X-Auth-Token` header is not supported. This authenticator is
applied if the Authorization header is present:
```
return (user != nil && user.AuthSource == AuthViaToken) ||
r.Header.Get("Authorization") != "" ||
r.URL.Query().Get("login-token") != ""
return r.Header.Get("Authorization") != ""
```
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`):

308
internal/auth/auth.go
View File

@ -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")
// http.Error(rw, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
onfailure(rw, r, errors.New("unauthorized (login first or use a token)"))
log.Debug("authentication failed: no authenticator applied")
onfailure(rw, r, errors.New("unauthorized (please login first)"))
})
}
// 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 {

212
internal/auth/jwt.go
View File

@ -6,10 +6,8 @@ package auth
import (
"crypto/ed25519"
"database/sql"
"encoding/base64"
"errors"
"fmt"
"net/http"
"os"
"strings"
@ -23,17 +21,11 @@ import (
type JWTAuthenticator struct {
auth *Authentication
publicKey ed25519.PublicKey
privateKey ed25519.PrivateKey
publicKeyCrossLogin ed25519.PublicKey // For accepting externally generated JWTs
loginTokenKey []byte // HS256 key
config *schema.JWTAuthConfig
publicKey ed25519.PublicKey
privateKey ed25519.PrivateKey
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(
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(
func (ja *JWTAuthenticator) AuthViaJWT(
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
}

224
internal/auth/jwtCookieSession.go Normal file
View File

@ -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
}

103
internal/auth/jwtSession.go Normal file
View File

@ -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
}

9
internal/auth/ldap.go
View File

@ -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

7
internal/auth/local.go
View File

@ -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)
}

165
internal/auth/roles.go Normal file
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@ -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
}
}

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internal/repository/testdata/job.db vendored
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