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package middlewares
import (
"bytes"
"encoding/json"
"fmt"
"time"
"github.com/golang-jwt/jwt/v4"
"github.com/google/uuid"
"github.com/authelia/authelia/v4/internal/model"
"github.com/authelia/authelia/v4/internal/templates"
)
// IdentityVerificationStart the handler for initiating the identity validation process.
func IdentityVerificationStart(args IdentityVerificationStartArgs, delayFunc TimingAttackDelayFunc) RequestHandler {
if args.IdentityRetrieverFunc == nil {
panic(fmt.Errorf("Identity verification requires an identity retriever"))
}
return func(ctx *AutheliaCtx) {
requestTime := time.Now()
success := false
if delayFunc != nil {
defer delayFunc(ctx.Logger, requestTime, &success)
}
identity, err := args.IdentityRetrieverFunc(ctx)
if err != nil {
// In that case we reply ok to avoid user enumeration.
ctx.Logger.Error(err)
ctx.ReplyOK()
return
}
var jti uuid.UUID
if jti, err = uuid.NewRandom(); err != nil {
ctx.Error(err, messageOperationFailed)
return
}
verification := model.NewIdentityVerification(jti, identity.Username, args.ActionClaim, ctx.RemoteIP())
// Create the claim with the action to sign it.
claims := verification.ToIdentityVerificationClaim()
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
ss, err := token.SignedString([]byte(ctx.Configuration.JWTSecret))
if err != nil {
ctx.Error(err, messageOperationFailed)
return
}
if err = ctx.Providers.StorageProvider.SaveIdentityVerification(ctx, verification); err != nil {
ctx.Error(err, messageOperationFailed)
return
}
uri, err := ctx.ExternalRootURL()
if err != nil {
ctx.Error(err, messageOperationFailed)
return
}
link := fmt.Sprintf("%s%s?token=%s", uri, args.TargetEndpoint, ss)
bufHTML := new(bytes.Buffer)
disableHTML := false
if ctx.Configuration.Notifier.SMTP != nil {
disableHTML = ctx.Configuration.Notifier.SMTP.DisableHTMLEmails
}
data := map[string]interface{}{
"Title": args.MailTitle,
"LinkURL": link,
"LinkText": args.MailButtonContent,
"DisplayName": identity.DisplayName,
"RemoteIP": ctx.RemoteIP().String(),
}
if !disableHTML {
if err = templates.EmailIdentityVerificationHTML.Execute(bufHTML, data); err != nil {
ctx.Error(err, messageOperationFailed)
return
}
}
bufText := new(bytes.Buffer)
if err = templates.EmailIdentityVerificationPlainText.Execute(bufText, data); err != nil {
ctx.Error(err, messageOperationFailed)
return
}
ctx.Logger.Debugf("Sending an email to user %s (%s) to confirm identity for registering a device.",
identity.Username, identity.Email)
if err = ctx.Providers.Notifier.Send(identity.Email, args.MailTitle, bufText.String(), bufHTML.String()); err != nil {
ctx.Error(err, messageOperationFailed)
return
}
success = true
ctx.ReplyOK()
}
}
// IdentityVerificationFinish the middleware for finishing the identity validation process.
func IdentityVerificationFinish(args IdentityVerificationFinishArgs, next func(ctx *AutheliaCtx, username string)) RequestHandler {
return func(ctx *AutheliaCtx) {
var finishBody IdentityVerificationFinishBody
b := ctx.PostBody()
err := json.Unmarshal(b, &finishBody)
if err != nil {
ctx.Error(err, messageOperationFailed)
return
}
if finishBody.Token == "" {
ctx.Error(fmt.Errorf("No token provided"), messageOperationFailed)
return
}
token, err := jwt.ParseWithClaims(finishBody.Token, &model.IdentityVerificationClaim{},
func(token *jwt.Token) (interface{}, error) {
return []byte(ctx.Configuration.JWTSecret), nil
})
if err != nil {
if ve, ok := err.(*jwt.ValidationError); ok {
switch {
case ve.Errors&jwt.ValidationErrorMalformed != 0:
ctx.Error(fmt.Errorf("Cannot parse token"), messageOperationFailed)
return
case ve.Errors&(jwt.ValidationErrorExpired|jwt.ValidationErrorNotValidYet) != 0:
// Token is either expired or not active yet.
ctx.Error(fmt.Errorf("Token expired"), messageIdentityVerificationTokenHasExpired)
return
default:
ctx.Error(fmt.Errorf("Cannot handle this token: %s", ve), messageOperationFailed)
return
}
}
ctx.Error(err, messageOperationFailed)
return
}
claims, ok := token.Claims.(*model.IdentityVerificationClaim)
if !ok {
ctx.Error(fmt.Errorf("Wrong type of claims (%T != *middlewares.IdentityVerificationClaim)", claims), messageOperationFailed)
return
}
verification, err := claims.ToIdentityVerification()
if err != nil {
ctx.Error(fmt.Errorf("Token seems to be invalid: %w", err),
messageOperationFailed)
return
}
found, err := ctx.Providers.StorageProvider.FindIdentityVerification(ctx, verification.JTI.String())
if err != nil {
ctx.Error(err, messageOperationFailed)
return
}
if !found {
ctx.Error(fmt.Errorf("Token is not in DB, it might have already been used"),
messageIdentityVerificationTokenAlreadyUsed)
return
}
// Verify that the action claim in the token is the one expected for the given endpoint.
if claims.Action != args.ActionClaim {
ctx.Error(fmt.Errorf("This token has not been generated for this kind of action"), messageOperationFailed)
return
}
if args.IsTokenUserValidFunc != nil && !args.IsTokenUserValidFunc(ctx, claims.Username) {
ctx.Error(fmt.Errorf("This token has not been generated for this user"), messageOperationFailed)
return
}
err = ctx.Providers.StorageProvider.ConsumeIdentityVerification(ctx, claims.ID, model.NewNullIP(ctx.RemoteIP()))
if err != nil {
ctx.Error(err, messageOperationFailed)
return
}
next(ctx, claims.Username)
}
}
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