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authentik/internal/web/tenant_tls/tenant_tls.go

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package tenant_tls
import (
"crypto/tls"
"strings"
"time"
log "github.com/sirupsen/logrus"
"goauthentik.io/api"
"goauthentik.io/internal/crypto"
"goauthentik.io/internal/outpost/ak"
)
type Watcher struct {
client *api.APIClient
log *log.Entry
cs *ak.CryptoStore
fallback *tls.Certificate
tenants []api.Tenant
}
func NewWatcher(client *api.APIClient) *Watcher {
cs := ak.NewCryptoStore(client.CryptoApi)
l := log.WithField("logger", "authentik.router.tenant_tls")
cert, err := crypto.GenerateSelfSignedCert()
if err != nil {
l.WithError(err).Error("failed to generate default cert")
}
return &Watcher{
client: client,
log: l,
cs: cs,
fallback: &cert,
}
}
func (w *Watcher) Start() {
ticker := time.NewTicker(time.Minute * 3)
w.log.Info("Starting Tenant TLS Checker")
for ; true; <-ticker.C {
w.Check()
}
}
func (w *Watcher) Check() {
w.log.Info("updating tenant certificates")
tenants, _, err := w.client.CoreApi.CoreTenantsListExecute(api.ApiCoreTenantsListRequest{})
if err != nil {
w.log.WithError(err).Warning("failed to get tenants")
return
}
for _, t := range tenants.Results {
if t.WebCertificate.IsSet() {
err := w.cs.AddKeypair(*t.WebCertificate.Get())
if err != nil {
w.log.WithError(err).Warning("failed to add certificate")
}
}
}
w.tenants = tenants.Results
}
func (w *Watcher) GetCertificate(ch *tls.ClientHelloInfo) (*tls.Certificate, error) {
var bestSelection *api.Tenant
for _, t := range w.tenants {
if !t.WebCertificate.IsSet() {
continue
}
if *t.Default {
bestSelection = &t
}
if strings.HasSuffix(ch.ServerName, t.Domain) {
bestSelection = &t
}
}
if bestSelection == nil {
return w.fallback, nil
}
cert := w.cs.Get(*bestSelection.WebCertificate.Get())
return cert, nil
}