portal/service/auth_service.go

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package service
import (
"crypto/ed25519"
"encoding/hex"
"errors"
"fmt"
"git.lumeweb.com/LumeWeb/portal/db"
"git.lumeweb.com/LumeWeb/portal/model"
"github.com/joomcode/errorx"
"github.com/kataras/iris/v12"
"github.com/kataras/jwt"
"golang.org/x/crypto/bcrypt"
"time"
)
var sharedKey = []byte("sercrethatmaycontainch@r$32chars")
var blocklist *jwt.Blocklist
func init() {
blocklist = jwt.NewBlocklist(1 * time.Hour)
}
type AuthService struct {
ctx iris.Context
}
type LoginRequest struct {
Email string `json:"email"`
Password string `json:"password"`
}
type LoginResponse struct {
Token string `json:"token"`
}
type LogoutRequest struct {
Token string `json:"token"`
}
type ChallengeRequest struct {
Pubkey string `json:"pubkey"`
}
type ChallengeResponse struct {
Challenge string `json:"challenge"`
}
type PubkeyLoginRequest struct {
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Pubkey string `json:"pubkey"`
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Challenge string `json:"challenge"`
Signature string `json:"signature"`
}
// verifyPassword compares the provided plaintext password with a hashed password and returns an error if they don't match.
func verifyPassword(hashedPassword, password string) error {
err := bcrypt.CompareHashAndPassword([]byte(hashedPassword), []byte(password))
if err != nil {
return errors.New("invalid email or password")
}
return nil
}
// generateToken generates a JWT token for the given account ID.
func generateToken(maxAge time.Duration) (string, error) {
// Define the JWT claims.
claim := jwt.Claims{
Expiry: time.Now().Add(time.Hour * 24).Unix(), // Token expires in 24 hours.
IssuedAt: time.Now().Unix(),
}
token, err := jwt.Sign(jwt.HS256, sharedKey, claim, jwt.MaxAge(maxAge))
if err != nil {
return "", err
}
return string(token), nil
}
func generateAndSaveLoginToken(accountID uint, maxAge time.Duration) (string, error) {
// Generate a JWT token for the authenticated user.
token, err := generateToken(maxAge)
if err != nil {
return "", fmt.Errorf("failed to generate token: %s", err)
}
verifiedToken, _ := jwt.Verify(jwt.HS256, sharedKey, []byte(token), blocklist)
var claim *jwt.Claims
_ = verifiedToken.Claims(&claim)
// Save the token to the database.
session := model.LoginSession{
Account: model.Account{ID: accountID},
Token: token,
Expiration: claim.ExpiresAt(),
}
if err := db.Get().Create(&session).Error; err != nil {
return "", errorx.Decorate(err, "failed to save token")
}
return token, nil
}
func generateAndSaveChallengeToken(accountID uint, maxAge time.Duration) (string, error) {
// Generate a JWT token for the authenticated user.
token, err := generateToken(maxAge)
if err != nil {
return "", fmt.Errorf("failed to generate token: %s", err)
}
verifiedToken, _ := jwt.Verify(jwt.HS256, sharedKey, []byte(token), blocklist)
var claim *jwt.Claims
_ = verifiedToken.Claims(&claim)
// Save the token to the database.
keyChallenge := model.KeyChallenge{
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AccountID: accountID,
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Challenge: token,
Expiration: claim.ExpiresAt(),
}
if err := db.Get().Create(&keyChallenge).Error; err != nil {
return "", errorx.Decorate(err, "failed to save token")
}
return token, nil
}
// PostLogin handles the POST /api/auth/login request to authenticate a user and return a JWT token.
func (a *AuthService) PostLogin() {
var r LoginRequest
// Read the login request from the client.
if err := a.ctx.ReadJSON(&r); err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, err)
return
}
// Retrieve the account for the given email.
account := model.Account{}
if err := db.Get().Where("email = ?", r.Email).First(&account).Error; err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, errors.New("invalid email or password"))
return
}
// Verify the provided password against the hashed password stored in the database.
if err := verifyPassword(*account.Password, r.Password); err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, errors.New("invalid email or password"))
return
}
// Generate a JWT token for the authenticated user.
token, err := generateAndSaveLoginToken(account.ID, 24*time.Hour)
if err != nil {
a.ctx.StopWithError(iris.StatusInternalServerError, fmt.Errorf("failed to generate token: %s", err))
return
}
// Return the JWT token to the client.
err = a.ctx.JSON(&LoginResponse{Token: token})
if err != nil {
panic(fmt.Errorf("Error with login attempt: %s \n", err))
}
}
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// PostChallenge handles the POST /api/auth/pubkey/challenge request to generate a challenge for a user's public key.
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func (a *AuthService) PostPubkeyChallenge() {
var r LoginRequest
// Read the login request from the client.
if err := a.ctx.ReadJSON(&r); err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, err)
return
}
// Retrieve the account for the given email.
account := model.Account{}
if err := db.Get().Where("email = ?", r.Email).First(&account).Error; err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, errors.New("invalid email or password"))
return
}
// Generate a random challenge string.
challenge, err := generateAndSaveChallengeToken(account.ID, time.Minute)
if err != nil {
a.ctx.StopWithError(iris.StatusInternalServerError, errors.New("failed to generate challenge"))
return
}
// Return the challenge to the client.
err = a.ctx.JSON(&ChallengeResponse{Challenge: challenge})
if err != nil {
panic(fmt.Errorf("Error with challenge request: %s \n", err))
}
}
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// PostKeyLogin handles the POST /api/auth/pubkey/login request to authenticate a user using a public key challenge and return a JWT token.
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func (a *AuthService) PostPubkeyLogin() {
var r PubkeyLoginRequest
// Read the key login request from the client.
if err := a.ctx.ReadJSON(&r); err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, err)
return
}
// Retrieve the key challenge for the given challenge.
challenge := model.KeyChallenge{}
if err := db.Get().Where("challenge = ?", r.Challenge).Preload("Key").First(&challenge).Error; err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, errorx.RejectedOperation.New("invalid key challenge"))
return
}
verifiedToken, err := jwt.Verify(jwt.HS256, sharedKey, []byte(r.Challenge), blocklist)
if err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, errorx.RejectedOperation.New("invalid key challenge"))
return
}
rawPubKey, err := hex.DecodeString(r.Pubkey)
if err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, errorx.RejectedOperation.New("invalid pubkey"))
return
}
rawSignature, err := hex.DecodeString(r.Signature)
if err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, errorx.RejectedOperation.New("invalid signature"))
return
}
publicKeyDecoded := ed25519.PublicKey(rawPubKey)
// Verify the challenge signature.
if !ed25519.Verify(publicKeyDecoded, []byte(r.Challenge), rawSignature) {
a.ctx.StopWithError(iris.StatusBadRequest, errorx.RejectedOperation.New("invalid challenge"))
}
// Generate a JWT token for the authenticated user.
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token, err := generateAndSaveLoginToken(challenge.AccountID, 24*time.Hour)
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if err != nil {
a.ctx.StopWithError(iris.StatusInternalServerError, errorx.RejectedOperation.Wrap(err, "failed to generate token"))
return
}
err = blocklist.InvalidateToken(verifiedToken.Token, verifiedToken.StandardClaims)
if err != nil {
a.ctx.StopWithError(iris.StatusInternalServerError, errorx.RejectedOperation.Wrap(err, "failed to invalidate token"))
return
}
if err := db.Get().Delete(&challenge).Error; err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, errorx.RejectedOperation.New("failed to delete key challenge"))
return
}
// Return the JWT token to the client.
err = a.ctx.JSON(&LoginResponse{Token: token})
if err != nil {
panic(fmt.Errorf("Error with login attempt: %s \n", err))
}
}
// PostLogout handles the POST /api/auth/logout request to invalidate a JWT token.
func (a *AuthService) PostLogout() {
var r LogoutRequest
// Read the logout request from the client.
if err := a.ctx.ReadJSON(&r); err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, err)
return
}
// Verify the provided token.
claims, err := jwt.Verify(jwt.HS256, sharedKey, []byte(r.Token), blocklist)
if err != nil {
a.ctx.StopWithError(iris.StatusBadRequest, errors.New("invalid token"))
return
}
err = blocklist.InvalidateToken(claims.Token, claims.StandardClaims)
if err != nil {
panic(fmt.Errorf("Error with logout: %s \n", err))
}
// Return a success response to the client.
a.ctx.StatusCode(iris.StatusNoContent)
}