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package handlers
import (
"bytes"
"fmt"
"net/url"
"github.com/go-webauthn/webauthn/protocol"
"github.com/go-webauthn/webauthn/webauthn"
"github.com/valyala/fasthttp"
"github.com/authelia/authelia/v4/internal/middlewares"
"github.com/authelia/authelia/v4/internal/model"
"github.com/authelia/authelia/v4/internal/regulation"
"github.com/authelia/authelia/v4/internal/session"
iwebauthn "github.com/authelia/authelia/v4/internal/webauthn"
)
// WebAuthnAssertionGET handler starts the assertion ceremony.
func WebAuthnAssertionGET(ctx *middlewares.AutheliaCtx) {
var (
w *webauthn.WebAuthn
user *model.WebAuthnUser
userSession session.UserSession
err error
)
if userSession, err = ctx.GetSession(); err != nil {
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
ctx.Logger.WithError(err).Errorf("Error occurred generating a WebAuthn authentication challenge: %s", errStrUserSessionData)
return
}
if userSession.IsAnonymous() {
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
ctx.Logger.WithError(errUserAnonymous).Error("Error occurred generating a WebAuthn authentication challenge")
return
}
var origin *url.URL
if origin, err = ctx.GetOrigin(); err != nil {
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
ctx.Logger.WithError(err).Errorf("Error occurred generating a WebAuthn authentication challenge for user '%s': error occurred provisioning the configuration", userSession.Username)
return
}
if w, err = ctx.GetWebAuthnProvider(); err != nil {
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
ctx.Logger.WithError(err).Errorf("Error occurred generating a WebAuthn authentication challenge for user '%s': error occurred provisioning the configuration", userSession.Username)
return
}
rpid := origin.Hostname()
if user, err = handleGetWebAuthnUserByRPID(ctx, userSession.Username, userSession.DisplayName, rpid); err != nil {
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
ctx.Logger.WithError(err).Errorf("Error occurred generating a WebAuthn authentication challenge for user '%s': error occurred retrieving the WebAuthn user configuration from the storage backend", userSession.Username)
return
}
extensions := map[string]any{}
if user.HasFIDOU2F() {
extensions["appid"] = w.Config.RPOrigins[0]
}
var opts = []webauthn.LoginOption{
webauthn.WithAllowedCredentials(user.WebAuthnCredentialDescriptors()),
webauthn.WithLoginRelyingPartyID(rpid),
}
if len(extensions) != 0 {
opts = append(opts, webauthn.WithAssertionExtensions(extensions))
}
var (
assertion *protocol.CredentialAssertion
data session.WebAuthn
)
if assertion, data.SessionData, err = w.BeginLogin(user, opts...); err != nil {
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
ctx.Logger.WithError(iwebauthn.FormatError(err)).Errorf("Error occurred generating a WebAuthn authentication challenge for user '%s': error occurred starting the authentication session", userSession.Username)
return
}
userSession.WebAuthn = &data
if err = ctx.SaveSession(userSession); err != nil {
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
ctx.Logger.WithError(err).Errorf("Error occurred generating a WebAuthn authentication challenge for user '%s': %s", userSession.Username, errStrUserSessionDataSave)
return
}
if err = ctx.SetJSONBody(assertion); err != nil {
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageUnableToRegisterSecurityKey)
ctx.Logger.WithError(err).Errorf("Error occurred generating a WebAuthn authentication challenge for user '%s': %s", userSession.Username, errStrRespBody)
return
}
}
// WebAuthnAssertionPOST handler completes the assertion ceremony after verifying the challenge.
//
//nolint:gocyclo
func WebAuthnAssertionPOST(ctx *middlewares.AutheliaCtx) {
var (
userSession session.UserSession
err error
w *webauthn.WebAuthn
c *webauthn.Credential
user *model.WebAuthnUser
bodyJSON bodySignWebAuthnRequest
response *protocol.ParsedCredentialAssertionData
)
if userSession, err = ctx.GetSession(); err != nil {
ctx.Logger.WithError(err).Errorf("Error occurred validating a WebAuthn authentication challenge: %s", errStrUserSessionData)
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
if userSession.IsAnonymous() {
ctx.Logger.WithError(errUserAnonymous).Error("Error occurred validating a WebAuthn authentication challenge")
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
if err = ctx.ParseBody(&bodyJSON); err != nil {
ctx.Logger.WithError(err).Errorf("Error occurred validating a WebAuthn authentication challenge for user '%s': %s", userSession.Username, errStrReqBodyParse)
ctx.SetStatusCode(fasthttp.StatusBadRequest)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
if response, err = protocol.ParseCredentialRequestResponseBody(bytes.NewReader(bodyJSON.Response)); err != nil {
ctx.Logger.WithError(iwebauthn.FormatError(err)).Errorf("Error occurred validating a WebAuthn authentication challenge for user '%s': %s", userSession.Username, errStrReqBodyParse)
ctx.SetStatusCode(fasthttp.StatusBadRequest)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
if userSession.WebAuthn == nil || userSession.WebAuthn.SessionData == nil {
ctx.Logger.WithError(fmt.Errorf("challenge session data is not present")).Errorf("Error occurred validating a WebAuthn authentication challenge for user '%s': %s", userSession.Username, errStrUserSessionData)
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
if w, err = ctx.GetWebAuthnProvider(); err != nil {
ctx.Logger.WithError(err).Errorf("Error occurred validating a WebAuthn authentication challenge for user '%s': error occurred provisioning the configuration", userSession.Username)
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
if user, err = handleGetWebAuthnUserByRPID(ctx, userSession.Username, userSession.DisplayName, w.Config.RPID); err != nil {
ctx.Logger.WithError(err).Errorf("Error occurred validating a WebAuthn authentication challenge for user '%s': error occurred retrieving the WebAuthn user configuration from the storage backend", userSession.Username)
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
if c, err = w.ValidateLogin(user, *userSession.WebAuthn.SessionData, response); err != nil {
doMarkAuthenticationAttempt(ctx, false, regulation.NewBan(regulation.BanTypeNone, userSession.Username, nil), regulation.AuthTypeWebAuthn, iwebauthn.FormatError(err))
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
defer func() {
userSession.WebAuthn = nil
if err = ctx.SaveSession(userSession); err != nil {
ctx.Logger.WithError(err).Errorf("Error occurred validating a WebAuthn authentication challenge for user '%s': %s", userSession.Username, errStrUserSessionDataSave)
}
}()
var found bool
for _, credential := range user.Credentials {
if bytes.Equal(credential.KID.Bytes(), c.ID) {
credential.UpdateSignInInfo(w.Config, ctx.Clock.Now().UTC(), c.Authenticator)
found = true
if err = ctx.Providers.StorageProvider.UpdateWebAuthnCredentialSignIn(ctx, credential); err != nil {
ctx.Logger.WithError(err).Errorf("Error occurred validating a WebAuthn authentication challenge for user '%s': error occurred saving the credential sign-in information to the storage backend", userSession.Username)
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
break
}
}
if !found {
ctx.Logger.WithError(fmt.Errorf("credential was not found")).Errorf("Error occurred validating a WebAuthn authentication challenge for user '%s': error occurred saving the credential sign-in information to storage", userSession.Username)
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
if c.Authenticator.CloneWarning {
ctx.Logger.WithError(fmt.Errorf("authenticator sign count indicates that it is cloned")).Errorf("Error occurred validating a WebAuthn authentication challenge for user '%s': error occurred validating the authenticator response", userSession.Username)
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
if err = ctx.RegenerateSession(); err != nil {
ctx.Logger.WithError(err).Errorf("Error occurred validating a WebAuthn authentication challenge for user '%s': error regenerating the user session", userSession.Username)
ctx.SetStatusCode(fasthttp.StatusForbidden)
ctx.SetJSONError(messageMFAValidationFailed)
return
}
doMarkAuthenticationAttempt(ctx, true, regulation.NewBan(regulation.BanTypeNone, userSession.Username, nil), regulation.AuthTypeWebAuthn, nil)
userSession.SetTwoFactorWebAuthn(ctx.Clock.Now(),
response.ParsedPublicKeyCredential.AuthenticatorAttachment == protocol.CrossPlatform,
response.Response.AuthenticatorData.Flags.HasUserPresent(),
response.Response.AuthenticatorData.Flags.HasUserVerified())
if bodyJSON.Workflow == workflowOpenIDConnect {
handleOIDCWorkflowResponse(ctx, &userSession, bodyJSON.WorkflowID)
} else {
Handle2FAResponse(ctx, bodyJSON.TargetURL)
}
}
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