74 lines
2.2 KiB
Go
74 lines
2.2 KiB
Go
package handlers
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import (
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"crypto/elliptic"
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"fmt"
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"github.com/authelia/authelia/internal/middlewares"
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"github.com/authelia/authelia/internal/session"
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"github.com/authelia/authelia/internal/storage"
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"github.com/tstranex/u2f"
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)
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// SecondFactorU2FSignGet handler for initiating a signing request.
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func SecondFactorU2FSignGet(ctx *middlewares.AutheliaCtx) {
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if ctx.XForwardedProto() == nil {
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ctx.Error(errMissingXForwardedProto, operationFailedMessage)
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return
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}
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if ctx.XForwardedHost() == nil {
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ctx.Error(errMissingXForwardedHost, operationFailedMessage)
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return
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}
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appID := fmt.Sprintf("%s://%s", ctx.XForwardedProto(), ctx.XForwardedHost())
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var trustedFacets = []string{appID}
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challenge, err := u2f.NewChallenge(appID, trustedFacets)
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if err != nil {
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ctx.Error(fmt.Errorf("Unable to create U2F challenge: %s", err), mfaValidationFailedMessage)
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return
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}
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userSession := ctx.GetSession()
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keyHandleBytes, publicKeyBytes, err := ctx.Providers.StorageProvider.LoadU2FDeviceHandle(userSession.Username)
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if err != nil {
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if err == storage.ErrNoU2FDeviceHandle {
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ctx.Error(fmt.Errorf("No device handle found for user %s", userSession.Username), mfaValidationFailedMessage)
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return
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}
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ctx.Error(fmt.Errorf("Unable to retrieve U2F device handle: %s", err), mfaValidationFailedMessage)
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return
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}
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var registration u2f.Registration
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registration.KeyHandle = keyHandleBytes
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x, y := elliptic.Unmarshal(elliptic.P256(), publicKeyBytes)
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registration.PubKey.Curve = elliptic.P256()
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registration.PubKey.X = x
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registration.PubKey.Y = y
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// Save the challenge and registration for use in next request
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userSession.U2FRegistration = &session.U2FRegistration{
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KeyHandle: keyHandleBytes,
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PublicKey: publicKeyBytes,
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}
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userSession.U2FChallenge = challenge
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err = ctx.SaveSession(userSession)
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if err != nil {
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ctx.Error(fmt.Errorf("Unable to save U2F challenge and registration in session: %s", err), mfaValidationFailedMessage)
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return
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}
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signRequest := challenge.SignRequest([]u2f.Registration{registration})
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err = ctx.SetJSONBody(signRequest)
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if err != nil {
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ctx.Error(fmt.Errorf("Unable to set sign request in body: %s", err), mfaValidationFailedMessage)
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return
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}
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}
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