mirror of https://github.com/caddyserver/caddy
108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddypki
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import (
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"crypto/x509"
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"fmt"
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"log"
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"runtime/debug"
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"time"
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"go.uber.org/zap"
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)
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func (p *PKI) maintenance() {
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defer func() {
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if err := recover(); err != nil {
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log.Printf("[PANIC] PKI maintenance: %v\n%s", err, debug.Stack())
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}
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}()
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ticker := time.NewTicker(10 * time.Minute) // TODO: make configurable
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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p.renewCerts()
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case <-p.ctx.Done():
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return
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}
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}
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}
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func (p *PKI) renewCerts() {
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for _, ca := range p.CAs {
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err := p.renewCertsForCA(ca)
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if err != nil {
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p.log.Error("renewing intermediate certificates",
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zap.Error(err),
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zap.String("ca", ca.ID))
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}
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}
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}
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func (p *PKI) renewCertsForCA(ca *CA) error {
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ca.mu.Lock()
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defer ca.mu.Unlock()
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log := p.log.With(zap.String("ca", ca.ID))
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// only maintain the root if it's not manually provided in the config
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if ca.Root == nil {
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if needsRenewal(ca.root) {
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// TODO: implement root renewal (use same key)
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log.Warn("root certificate expiring soon (FIXME: ROOT RENEWAL NOT YET IMPLEMENTED)",
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zap.Duration("time_remaining", time.Until(ca.inter.NotAfter)),
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)
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}
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}
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// only maintain the intermediate if it's not manually provided in the config
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if ca.Intermediate == nil {
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if needsRenewal(ca.inter) {
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log.Info("intermediate expires soon; renewing",
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zap.Duration("time_remaining", time.Until(ca.inter.NotAfter)),
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)
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rootCert, rootKey, err := ca.loadOrGenRoot()
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if err != nil {
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return fmt.Errorf("loading root key: %v", err)
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}
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interCert, interKey, err := ca.genIntermediate(rootCert, rootKey)
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if err != nil {
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return fmt.Errorf("generating new certificate: %v", err)
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}
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ca.inter, ca.interKey = interCert, interKey
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log.Info("renewed intermediate",
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zap.Time("new_expiration", ca.inter.NotAfter),
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)
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}
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}
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return nil
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}
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func needsRenewal(cert *x509.Certificate) bool {
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lifetime := cert.NotAfter.Sub(cert.NotBefore)
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renewalWindow := time.Duration(float64(lifetime) * renewalWindowRatio)
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renewalWindowStart := cert.NotAfter.Add(-renewalWindow)
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return time.Now().After(renewalWindowStart)
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}
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const renewalWindowRatio = 0.2 // TODO: make configurable
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