2021-09-26 02:53:05 -06:00
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package headscale
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import (
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2021-12-22 19:43:53 -07:00
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"bytes"
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"context"
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"crypto/rand"
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"encoding/hex"
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"errors"
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"fmt"
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"html/template"
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"net/http"
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"strings"
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"time"
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2021-10-06 03:19:15 -06:00
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"github.com/coreos/go-oidc/v3/oidc"
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"github.com/gin-gonic/gin"
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"github.com/patrickmn/go-cache"
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"github.com/rs/zerolog/log"
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"golang.org/x/oauth2"
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"gorm.io/gorm"
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"tailscale.com/types/key"
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)
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const (
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oidcStateCacheExpiration = time.Minute * 5
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oidcStateCacheCleanupInterval = time.Minute * 10
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randomByteSize = 16
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)
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type IDTokenClaims struct {
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Name string `json:"name,omitempty"`
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Groups []string `json:"groups,omitempty"`
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Email string `json:"email"`
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Username string `json:"preferred_username,omitempty"`
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}
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func (h *Headscale) initOIDC() error {
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var err error
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// grab oidc config if it hasn't been already
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if h.oauth2Config == nil {
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h.oidcProvider, err = oidc.NewProvider(context.Background(), h.cfg.OIDC.Issuer)
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if err != nil {
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log.Error().
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Err(err).
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Caller().
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Msgf("Could not retrieve OIDC Config: %s", err.Error())
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return err
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}
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h.oauth2Config = &oauth2.Config{
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ClientID: h.cfg.OIDC.ClientID,
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ClientSecret: h.cfg.OIDC.ClientSecret,
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Endpoint: h.oidcProvider.Endpoint(),
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RedirectURL: fmt.Sprintf(
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"%s/oidc/callback",
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strings.TrimSuffix(h.cfg.ServerURL, "/"),
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),
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Scopes: []string{oidc.ScopeOpenID, "profile", "email"},
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}
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}
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// init the state cache if it hasn't been already
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if h.oidcStateCache == nil {
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h.oidcStateCache = cache.New(
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oidcStateCacheExpiration,
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oidcStateCacheCleanupInterval,
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)
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}
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return nil
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}
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// RegisterOIDC redirects to the OIDC provider for authentication
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// Puts machine key in cache so the callback can retrieve it using the oidc state param
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// Listens in /oidc/register/:mKey.
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func (h *Headscale) RegisterOIDC(ctx *gin.Context) {
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machineKeyStr := ctx.Param("mkey")
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if machineKeyStr == "" {
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ctx.String(http.StatusBadRequest, "Wrong params")
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return
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}
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2021-11-22 12:32:11 -07:00
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log.Trace().
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Caller().
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Str("machine_key", machineKeyStr).
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Msg("Received oidc register call")
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randomBlob := make([]byte, randomByteSize)
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if _, err := rand.Read(randomBlob); err != nil {
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log.Error().
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Caller().
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Msg("could not read 16 bytes from rand")
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ctx.String(http.StatusInternalServerError, "could not read 16 bytes from rand")
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2021-09-26 07:12:36 -06:00
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return
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}
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stateStr := hex.EncodeToString(randomBlob)[:32]
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// place the machine key into the state cache, so it can be retrieved later
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h.oidcStateCache.Set(stateStr, machineKeyStr, oidcStateCacheExpiration)
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authURL := h.oauth2Config.AuthCodeURL(stateStr)
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log.Debug().Msgf("Redirecting to %s for authentication", authURL)
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ctx.Redirect(http.StatusFound, authURL)
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}
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type oidcCallbackTemplateConfig struct {
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User string
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Verb string
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}
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var oidcCallbackTemplate = template.Must(
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template.New("oidccallback").Parse(`<html>
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<body>
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<h1>headscale</h1>
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<p>
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{{.Verb}} as {{.User}}, you can now close this window.
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</p>
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</body>
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</html>`),
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)
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2022-01-16 06:16:59 -07:00
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// TODO: Why is the entire machine registration logic duplicated here?
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// OIDCCallback handles the callback from the OIDC endpoint
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// Retrieves the mkey from the state cache and adds the machine to the users email namespace
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// TODO: A confirmation page for new machines should be added to avoid phishing vulnerabilities
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// TODO: Add groups information from OIDC tokens into machine HostInfo
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// Listens in /oidc/callback.
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func (h *Headscale) OIDCCallback(ctx *gin.Context) {
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code := ctx.Query("code")
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state := ctx.Query("state")
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if code == "" || state == "" {
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ctx.String(http.StatusBadRequest, "Wrong params")
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return
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}
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oauth2Token, err := h.oauth2Config.Exchange(context.Background(), code)
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if err != nil {
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ctx.String(http.StatusBadRequest, "Could not exchange code for token")
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return
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}
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2021-11-22 12:32:11 -07:00
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log.Trace().
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Caller().
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Str("code", code).
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Str("state", state).
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Msg("Got oidc callback")
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rawIDToken, rawIDTokenOK := oauth2Token.Extra("id_token").(string)
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if !rawIDTokenOK {
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ctx.String(http.StatusBadRequest, "Could not extract ID Token")
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return
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}
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2021-10-18 13:27:52 -06:00
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verifier := h.oidcProvider.Verifier(&oidc.Config{ClientID: h.cfg.OIDC.ClientID})
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idToken, err := verifier.Verify(context.Background(), rawIDToken)
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if err != nil {
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log.Error().
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Err(err).
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Caller().
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Msg("failed to verify id token")
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ctx.String(http.StatusBadRequest, "Failed to verify id token")
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2021-10-06 03:19:15 -06:00
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return
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}
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2021-10-10 03:22:42 -06:00
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// TODO: we can use userinfo at some point to grab additional information about the user (groups membership, etc)
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2021-11-14 10:44:37 -07:00
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// userInfo, err := oidcProvider.UserInfo(context.Background(), oauth2.StaticTokenSource(oauth2Token))
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// if err != nil {
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// c.String(http.StatusBadRequest, fmt.Sprintf("Failed to retrieve userinfo"))
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// return
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// }
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// Extract custom claims
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var claims IDTokenClaims
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if err = idToken.Claims(&claims); err != nil {
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log.Error().
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Err(err).
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Caller().
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Msg("Failed to decode id token claims")
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ctx.String(
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http.StatusBadRequest,
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"Failed to decode id token claims",
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)
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return
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}
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2021-10-18 13:27:52 -06:00
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// retrieve machinekey from state cache
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machineKeyIf, machineKeyFound := h.oidcStateCache.Get(state)
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2021-11-21 14:51:39 -07:00
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if !machineKeyFound {
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2021-11-13 01:36:45 -07:00
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log.Error().
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Msg("requested machine state key expired before authorisation completed")
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ctx.String(http.StatusBadRequest, "state has expired")
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return
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}
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machineKeyStr, machineKeyOK := machineKeyIf.(string)
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2021-11-26 16:50:42 -07:00
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var machineKey key.MachinePublic
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err = machineKey.UnmarshalText([]byte(MachinePublicKeyEnsurePrefix(machineKeyStr)))
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if err != nil {
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log.Error().
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Msg("could not parse machine public key")
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ctx.String(http.StatusBadRequest, "could not parse public key")
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return
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}
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2021-11-21 14:51:39 -07:00
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if !machineKeyOK {
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log.Error().Msg("could not get machine key from cache")
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2021-11-14 12:32:03 -07:00
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ctx.String(
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http.StatusInternalServerError,
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"could not get machine key from cache",
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)
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2021-11-14 08:46:09 -07:00
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2021-09-26 02:53:05 -06:00
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return
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}
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2021-11-22 12:32:52 -07:00
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// TODO(kradalby): Currently, if it fails to find a requested expiry, non will be set
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requestedTime := time.Time{}
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if requestedTimeIf, found := h.requestedExpiryCache.Get(machineKey.String()); found {
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2021-11-22 12:32:52 -07:00
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if reqTime, ok := requestedTimeIf.(time.Time); ok {
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requestedTime = reqTime
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}
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}
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2021-09-26 02:53:05 -06:00
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// retrieve machine information
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2021-11-21 14:51:39 -07:00
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machine, err := h.GetMachineByMachineKey(machineKey)
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2021-10-10 03:22:42 -06:00
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if err != nil {
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2021-09-26 02:53:05 -06:00
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log.Error().Msg("machine key not found in database")
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2021-11-14 12:32:03 -07:00
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ctx.String(
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2021-11-13 01:36:45 -07:00
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http.StatusInternalServerError,
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"could not get machine info from database",
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)
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2021-11-14 08:46:09 -07:00
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2021-09-26 02:53:05 -06:00
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return
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}
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2021-11-22 12:32:11 -07:00
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if machine.isRegistered() {
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log.Trace().
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Caller().
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Str("machine", machine.Name).
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Msg("machine already registered, reauthenticating")
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h.RefreshMachine(machine, requestedTime)
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2021-12-22 19:43:53 -07:00
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var content bytes.Buffer
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if err := oidcCallbackTemplate.Execute(&content, oidcCallbackTemplateConfig{
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User: claims.Email,
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Verb: "Reauthenticated",
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}); err != nil {
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log.Error().
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Str("func", "OIDCCallback").
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Str("type", "reauthenticate").
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Err(err).
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Msg("Could not render OIDC callback template")
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|
ctx.Data(
|
|
|
|
|
http.StatusInternalServerError,
|
|
|
|
|
"text/html; charset=utf-8",
|
|
|
|
|
[]byte("Could not render OIDC callback template"),
|
|
|
|
|
)
|
|
|
|
|
}
|
2021-11-22 12:32:11 -07:00
|
|
|
|
2021-12-22 19:43:53 -07:00
|
|
|
ctx.Data(http.StatusOK, "text/html; charset=utf-8", content.Bytes())
|
2021-11-22 12:32:11 -07:00
|
|
|
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
|
2021-10-10 03:22:42 -06:00
|
|
|
now := time.Now().UTC()
|
|
|
|
|
|
2022-02-22 04:46:45 -07:00
|
|
|
namespaceName, err := NormalizeNamespaceName(claims.Email)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Error().Err(err).Caller().Msgf("couldn't normalize email")
|
|
|
|
|
ctx.String(
|
|
|
|
|
http.StatusInternalServerError,
|
|
|
|
|
"couldn't normalize email",
|
|
|
|
|
)
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
// register the machine if it's new
|
|
|
|
|
if !machine.Registered {
|
|
|
|
|
log.Debug().Msg("Registering new machine after successful callback")
|
2021-11-21 14:51:39 -07:00
|
|
|
|
2022-02-22 04:46:45 -07:00
|
|
|
namespace, err := h.GetNamespace(namespaceName)
|
|
|
|
|
if errors.Is(err, gorm.ErrRecordNotFound) {
|
|
|
|
|
namespace, err = h.CreateNamespace(namespaceName)
|
2021-09-26 07:12:36 -06:00
|
|
|
|
|
|
|
|
if err != nil {
|
2021-11-21 14:51:39 -07:00
|
|
|
log.Error().
|
|
|
|
|
Err(err).
|
2022-02-22 04:46:45 -07:00
|
|
|
Caller().
|
|
|
|
|
Msgf("could not create new namespace '%s'", namespaceName)
|
2021-11-14 12:32:03 -07:00
|
|
|
ctx.String(
|
2021-11-13 01:36:45 -07:00
|
|
|
http.StatusInternalServerError,
|
2022-02-22 04:46:45 -07:00
|
|
|
"could not create new namespace",
|
2021-11-13 01:36:45 -07:00
|
|
|
)
|
2021-11-14 08:46:09 -07:00
|
|
|
|
2021-09-26 07:12:36 -06:00
|
|
|
return
|
|
|
|
|
}
|
2022-02-22 04:46:45 -07:00
|
|
|
} else if err != nil {
|
|
|
|
|
log.Error().
|
|
|
|
|
Caller().
|
|
|
|
|
Err(err).
|
|
|
|
|
Str("namespace", namespaceName).
|
|
|
|
|
Msg("could not find or create namespace")
|
|
|
|
|
ctx.String(
|
|
|
|
|
http.StatusInternalServerError,
|
|
|
|
|
"could not find or create namespace",
|
|
|
|
|
)
|
2021-09-26 02:53:05 -06:00
|
|
|
|
2022-02-22 04:46:45 -07:00
|
|
|
return
|
2021-09-26 02:53:05 -06:00
|
|
|
}
|
|
|
|
|
|
2022-02-22 04:46:45 -07:00
|
|
|
ips, err := h.getAvailableIPs()
|
|
|
|
|
if err != nil {
|
2021-12-22 19:43:53 -07:00
|
|
|
log.Error().
|
2022-02-22 04:46:45 -07:00
|
|
|
Caller().
|
2021-12-22 19:43:53 -07:00
|
|
|
Err(err).
|
2022-02-22 04:46:45 -07:00
|
|
|
Msg("could not get an IP from the pool")
|
|
|
|
|
ctx.String(
|
2021-12-22 19:43:53 -07:00
|
|
|
http.StatusInternalServerError,
|
2022-02-22 04:46:45 -07:00
|
|
|
"could not get an IP from the pool",
|
2021-12-22 19:43:53 -07:00
|
|
|
)
|
|
|
|
|
|
2022-02-22 04:46:45 -07:00
|
|
|
return
|
|
|
|
|
}
|
2021-11-22 10:22:47 -07:00
|
|
|
|
2022-02-22 04:46:45 -07:00
|
|
|
machine.IPAddresses = ips
|
|
|
|
|
machine.NamespaceID = namespace.ID
|
|
|
|
|
machine.Registered = true
|
|
|
|
|
machine.RegisterMethod = RegisterMethodOIDC
|
|
|
|
|
machine.LastSuccessfulUpdate = &now
|
|
|
|
|
machine.Expiry = &requestedTime
|
|
|
|
|
h.db.Save(&machine)
|
2021-10-18 13:27:52 -06:00
|
|
|
}
|
|
|
|
|
|
2022-02-22 04:46:45 -07:00
|
|
|
var content bytes.Buffer
|
|
|
|
|
if err := oidcCallbackTemplate.Execute(&content, oidcCallbackTemplateConfig{
|
|
|
|
|
User: claims.Email,
|
|
|
|
|
Verb: "Authenticated",
|
|
|
|
|
}); err != nil {
|
|
|
|
|
log.Error().
|
|
|
|
|
Str("func", "OIDCCallback").
|
|
|
|
|
Str("type", "authenticate").
|
|
|
|
|
Err(err).
|
|
|
|
|
Msg("Could not render OIDC callback template")
|
|
|
|
|
ctx.Data(
|
|
|
|
|
http.StatusInternalServerError,
|
|
|
|
|
"text/html; charset=utf-8",
|
|
|
|
|
[]byte("Could not render OIDC callback template"),
|
|
|
|
|
)
|
2021-10-18 13:27:52 -06:00
|
|
|
}
|
|
|
|
|
|
2022-02-22 04:46:45 -07:00
|
|
|
ctx.Data(http.StatusOK, "text/html; charset=utf-8", content.Bytes())
|
|
|
|
|
|
|
|
|
|
return
|
2021-09-26 02:53:05 -06:00
|
|
|
}
|
