cc-backend/internal/auth/jwtSession.go

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// 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"
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"errors"
"fmt"
"net/http"
"os"
"strings"
"github.com/ClusterCockpit/cc-backend/internal/config"
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"github.com/ClusterCockpit/cc-backend/internal/repository"
"github.com/ClusterCockpit/cc-backend/pkg/log"
"github.com/ClusterCockpit/cc-backend/pkg/schema"
"github.com/golang-jwt/jwt/v4"
)
type JWTSessionAuthenticator struct {
loginTokenKey []byte // HS256 key
}
var _ Authenticator = (*JWTSessionAuthenticator)(nil)
func (ja *JWTSessionAuthenticator) Init() error {
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
}
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log.Info("JWT Session authenticator successfully registered")
return nil
}
func (ja *JWTSessionAuthenticator) CanLogin(
user *schema.User,
username string,
rw http.ResponseWriter,
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r *http.Request) (*schema.User, bool) {
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return user, r.Header.Get("Authorization") != "" ||
r.URL.Query().Get("login-token") != ""
}
func (ja *JWTSessionAuthenticator) Login(
user *schema.User,
rw http.ResponseWriter,
r *http.Request) (*schema.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.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)
var name string
if wrap, ok := claims["name"].(map[string]interface{}); ok {
if vals, ok := wrap["values"].([]interface{}); ok {
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if len(vals) != 0 {
name = fmt.Sprintf("%v", vals[0])
for i := 1; i < len(vals); i++ {
name += fmt.Sprintf(" %v", vals[i])
}
}
}
}
var roles []string
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if config.Keys.JwtConfig.ValidateUser {
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// 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")
}
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// 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 {
if schema.IsValidRole(r) {
roles = append(roles, r)
}
}
}
}
}
projects := make([]string, 0)
// Java/Grails Issued Token
// if rawprojs, ok := claims["projects"].([]interface{}); ok {
// for _, pp := range rawprojs {
// if p, ok := pp.(string); ok {
// projects = append(projects, p)
// }
// }
// } else if rawprojs, ok := claims["projects"]; ok {
// for _, p := range rawprojs.([]string) {
// projects = append(projects, p)
// }
// }
if user == nil {
user = &schema.User{
Username: sub,
Name: name,
Roles: roles,
Projects: projects,
AuthType: schema.AuthSession,
AuthSource: schema.AuthViaToken,
}
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if config.Keys.JwtConfig.SyncUserOnLogin {
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if err := repository.GetUserRepository().AddUser(user); err != nil {
log.Errorf("Error while adding user '%s' to DB", user.Username)
}
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}
}
return user, nil
}