238 lines
7.8 KiB
Go
238 lines
7.8 KiB
Go
package outpost
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"net/http/cookiejar"
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"net/url"
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"strconv"
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"strings"
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"github.com/getsentry/sentry-go"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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log "github.com/sirupsen/logrus"
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"goauthentik.io/api"
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"goauthentik.io/internal/constants"
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"goauthentik.io/internal/outpost/ak"
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)
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type StageComponent string
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var (
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FlowTimingGet = promauto.NewHistogramVec(prometheus.HistogramOpts{
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Name: "authentik_outpost_flow_timing_get",
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Help: "Duration it took to get a challenge",
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}, []string{"stage", "flow", "client", "user"})
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FlowTimingPost = promauto.NewHistogramVec(prometheus.HistogramOpts{
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Name: "authentik_outpost_flow_timing_post",
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Help: "Duration it took to send a challenge",
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}, []string{"stage", "flow", "client", "user"})
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)
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const (
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StageIdentification = StageComponent("ak-stage-identification")
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StagePassword = StageComponent("ak-stage-password")
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StageAuthenticatorValidate = StageComponent("ak-stage-authenticator-validate")
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StageAccessDenied = StageComponent("ak-stage-access-denied")
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)
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const (
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HeaderAuthentikRemoteIP = "X-authentik-remote-ip"
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HeaderAuthentikOutpostToken = "X-authentik-outpost-token"
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)
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type FlowExecutor struct {
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Params url.Values
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Answers map[StageComponent]string
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Context context.Context
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cip string
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api *api.APIClient
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flowSlug string
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log *log.Entry
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token string
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sp *sentry.Span
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}
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func NewFlowExecutor(ctx context.Context, flowSlug string, refConfig *api.Configuration, logFields log.Fields) *FlowExecutor {
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rsp := sentry.StartSpan(ctx, "authentik.outposts.flow_executor")
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l := log.WithField("flow", flowSlug).WithFields(logFields)
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jar, err := cookiejar.New(nil)
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if err != nil {
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l.WithError(err).Warning("Failed to create cookiejar")
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panic(err)
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}
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// Create new http client that also sets the correct ip
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config := api.NewConfiguration()
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config.Host = refConfig.Host
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config.Scheme = refConfig.Scheme
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config.HTTPClient = &http.Client{
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Jar: jar,
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Transport: ak.NewUserAgentTransport(constants.OutpostUserAgent(), ak.NewTracingTransport(rsp.Context(), ak.GetTLSTransport())),
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}
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token := strings.Split(refConfig.DefaultHeader["Authorization"], " ")[1]
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config.AddDefaultHeader(HeaderAuthentikOutpostToken, token)
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apiClient := api.NewAPIClient(config)
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return &FlowExecutor{
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Params: url.Values{},
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Answers: make(map[StageComponent]string),
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Context: rsp.Context(),
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api: apiClient,
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flowSlug: flowSlug,
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log: l,
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token: token,
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sp: rsp,
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cip: "",
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}
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}
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func (fe *FlowExecutor) ApiClient() *api.APIClient {
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return fe.api
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}
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type ChallengeInt interface {
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GetComponent() string
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GetType() api.ChallengeChoices
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GetResponseErrors() map[string][]api.ErrorDetail
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}
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func (fe *FlowExecutor) DelegateClientIP(a string) {
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fe.cip = a
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fe.api.GetConfig().AddDefaultHeader(HeaderAuthentikRemoteIP, fe.cip)
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}
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func (fe *FlowExecutor) CheckApplicationAccess(appSlug string) (bool, error) {
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acsp := sentry.StartSpan(fe.Context, "authentik.outposts.flow_executor.check_access")
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defer acsp.Finish()
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p, _, err := fe.api.CoreApi.CoreApplicationsCheckAccessRetrieve(acsp.Context(), appSlug).Execute()
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if !p.Passing {
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fe.log.Info("Access denied for user")
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return false, nil
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}
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if err != nil {
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return false, fmt.Errorf("failed to check access: %w", err)
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}
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fe.log.Debug("User has access")
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return true, nil
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}
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func (fe *FlowExecutor) getAnswer(stage StageComponent) string {
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if v, o := fe.Answers[stage]; o {
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return v
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}
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return ""
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}
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// WarmUp Ensure authentik's flow cache is warmed up
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func (fe *FlowExecutor) WarmUp() error {
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gcsp := sentry.StartSpan(fe.Context, "authentik.outposts.flow_executor.get_challenge")
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defer gcsp.Finish()
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req := fe.api.FlowsApi.FlowsExecutorGet(gcsp.Context(), fe.flowSlug).Query(fe.Params.Encode())
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_, _, err := req.Execute()
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return err
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}
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func (fe *FlowExecutor) Execute() (bool, error) {
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return fe.solveFlowChallenge(1)
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}
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func (fe *FlowExecutor) solveFlowChallenge(depth int) (bool, error) {
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defer fe.sp.Finish()
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// Get challenge
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gcsp := sentry.StartSpan(fe.Context, "authentik.outposts.flow_executor.get_challenge")
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req := fe.api.FlowsApi.FlowsExecutorGet(gcsp.Context(), fe.flowSlug).Query(fe.Params.Encode())
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challenge, _, err := req.Execute()
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if err != nil {
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return false, errors.New("failed to get challenge")
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}
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ch := challenge.GetActualInstance().(ChallengeInt)
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fe.log.WithField("component", ch.GetComponent()).WithField("type", ch.GetType()).Debug("Got challenge")
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gcsp.SetTag("ak_challenge", string(ch.GetType()))
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gcsp.SetTag("ak_component", ch.GetComponent())
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gcsp.Finish()
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FlowTimingGet.With(prometheus.Labels{
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"stage": ch.GetComponent(),
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"flow": fe.flowSlug,
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"client": fe.cip,
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"user": fe.Answers[StageIdentification],
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}).Observe(float64(gcsp.EndTime.Sub(gcsp.StartTime)))
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// Resole challenge
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scsp := sentry.StartSpan(fe.Context, "authentik.outposts.flow_executor.solve_challenge")
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responseReq := fe.api.FlowsApi.FlowsExecutorSolve(scsp.Context(), fe.flowSlug).Query(fe.Params.Encode())
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switch ch.GetComponent() {
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case string(StageIdentification):
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r := api.NewIdentificationChallengeResponseRequest(fe.getAnswer(StageIdentification))
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r.SetPassword(fe.getAnswer(StagePassword))
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responseReq = responseReq.FlowChallengeResponseRequest(api.IdentificationChallengeResponseRequestAsFlowChallengeResponseRequest(r))
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case string(StagePassword):
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responseReq = responseReq.FlowChallengeResponseRequest(api.PasswordChallengeResponseRequestAsFlowChallengeResponseRequest(api.NewPasswordChallengeResponseRequest(fe.getAnswer(StagePassword))))
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case string(StageAuthenticatorValidate):
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// We only support duo as authenticator, check if that's allowed
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var deviceChallenge *api.DeviceChallenge
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for _, devCh := range challenge.AuthenticatorValidationChallenge.DeviceChallenges {
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if devCh.DeviceClass == string(api.DEVICECLASSESENUM_DUO) {
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deviceChallenge = &devCh
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}
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}
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if deviceChallenge == nil {
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return false, errors.New("got ak-stage-authenticator-validate without duo")
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}
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devId, err := strconv.Atoi(deviceChallenge.DeviceUid)
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if err != nil {
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return false, errors.New("failed to convert duo device id to int")
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}
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devId32 := int32(devId)
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inner := api.NewAuthenticatorValidationChallengeResponseRequest()
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inner.SelectedChallenge = (*api.DeviceChallengeRequest)(deviceChallenge)
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inner.Duo = &devId32
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responseReq = responseReq.FlowChallengeResponseRequest(api.AuthenticatorValidationChallengeResponseRequestAsFlowChallengeResponseRequest(inner))
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case string(StageAccessDenied):
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return false, errors.New("got ak-stage-access-denied")
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default:
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return false, fmt.Errorf("unsupported challenge type %s", ch.GetComponent())
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}
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response, _, err := responseReq.Execute()
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ch = response.GetActualInstance().(ChallengeInt)
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fe.log.WithField("component", ch.GetComponent()).WithField("type", ch.GetType()).Debug("Got response")
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scsp.SetTag("ak_challenge", string(ch.GetType()))
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scsp.SetTag("ak_component", ch.GetComponent())
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scsp.Finish()
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switch ch.GetComponent() {
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case string(StageAccessDenied):
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return false, errors.New("got ak-stage-access-denied")
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}
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if ch.GetType() == "redirect" {
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return true, nil
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}
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if err != nil {
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return false, fmt.Errorf("failed to submit challenge %w", err)
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}
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if len(ch.GetResponseErrors()) > 0 {
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for key, errs := range ch.GetResponseErrors() {
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for _, err := range errs {
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return false, fmt.Errorf("flow error %s: %s", key, err.String)
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}
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}
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}
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FlowTimingPost.With(prometheus.Labels{
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"stage": ch.GetComponent(),
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"flow": fe.flowSlug,
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"client": fe.cip,
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"user": fe.Answers[StageIdentification],
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}).Observe(float64(scsp.EndTime.Sub(scsp.StartTime)))
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if depth >= 10 {
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return false, errors.New("exceeded stage recursion depth")
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}
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return fe.solveFlowChallenge(depth + 1)
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}
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