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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package caddytls
import (
"crypto/x509"
"encoding/json"
"fmt"
"io/ioutil"
"net/url"
"time"
"github.com/caddyserver/caddy/v2"
"github.com/go-acme/lego/v3/challenge"
"github.com/mholt/certmagic"
)
func init() {
caddy.RegisterModule(ACMEManagerMaker{})
}
// ACMEManagerMaker makes an ACME manager
// for managing certificates using ACME.
// If crafting one manually rather than
// through the config-unmarshal process
// (provisioning), be sure to call
// SetDefaults to ensure sane defaults
// after you have configured this struct
// to your liking.
type ACMEManagerMaker struct {
CA string `json:"ca,omitempty"`
Email string `json:"email,omitempty"`
RenewAhead caddy.Duration `json:"renew_ahead,omitempty"`
KeyType string `json:"key_type,omitempty"`
ACMETimeout caddy.Duration `json:"acme_timeout,omitempty"`
MustStaple bool `json:"must_staple,omitempty"`
Challenges *ChallengesConfig `json:"challenges,omitempty"`
OnDemand bool `json:"on_demand,omitempty"`
Storage json.RawMessage `json:"storage,omitempty"`
TrustedRootsPEMFiles []string `json:"trusted_roots_pem_files,omitempty"`
storage certmagic.Storage
rootPool *x509.CertPool
}
// CaddyModule returns the Caddy module information.
func (ACMEManagerMaker) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
Name: "tls.management.acme",
New: func() caddy.Module { return new(ACMEManagerMaker) },
}
}
// NewManager is a no-op to satisfy the ManagerMaker interface,
// because this manager type is a special case.
func (m ACMEManagerMaker) NewManager(interactive bool) (certmagic.Manager, error) {
return nil, nil
}
// Provision sets up m.
func (m *ACMEManagerMaker) Provision(ctx caddy.Context) error {
// DNS providers
if m.Challenges != nil && m.Challenges.DNSRaw != nil {
val, err := ctx.LoadModuleInline("provider", "tls.dns", m.Challenges.DNSRaw)
if err != nil {
return fmt.Errorf("loading DNS provider module: %s", err)
}
m.Challenges.DNS = val.(challenge.Provider)
m.Challenges.DNSRaw = nil // allow GC to deallocate
}
// policy-specific storage implementation
if m.Storage != nil {
val, err := ctx.LoadModuleInline("module", "caddy.storage", m.Storage)
if err != nil {
return fmt.Errorf("loading TLS storage module: %s", err)
}
cmStorage, err := val.(caddy.StorageConverter).CertMagicStorage()
if err != nil {
return fmt.Errorf("creating TLS storage configuration: %v", err)
}
m.storage = cmStorage
m.Storage = nil // allow GC to deallocate
}
// add any custom CAs to trust store
if len(m.TrustedRootsPEMFiles) > 0 {
m.rootPool = x509.NewCertPool()
for _, pemFile := range m.TrustedRootsPEMFiles {
pemData, err := ioutil.ReadFile(pemFile)
if err != nil {
return fmt.Errorf("loading trusted root CA's PEM file: %s: %v", pemFile, err)
}
if !m.rootPool.AppendCertsFromPEM(pemData) {
return fmt.Errorf("unable to add %s to trust pool: %v", pemFile, err)
}
}
}
return nil
}
// makeCertMagicConfig converts m into a certmagic.Config, because
// this is a special case where the default manager is the certmagic
// Config and not a separate manager.
func (m *ACMEManagerMaker) makeCertMagicConfig(ctx caddy.Context) certmagic.Config {
storage := m.storage
if storage == nil {
storage = ctx.Storage()
}
var ond *certmagic.OnDemandConfig
if m.OnDemand {
var onDemand *OnDemandConfig
appVal, err := ctx.App("tls")
if err == nil && appVal.(*TLS).Automation != nil {
onDemand = appVal.(*TLS).Automation.OnDemand
}
ond = &certmagic.OnDemandConfig{
DecisionFunc: func(name string) error {
if onDemand != nil {
if onDemand.Ask != "" {
err := onDemandAskRequest(onDemand.Ask, name)
if err != nil {
return err
}
}
// check the rate limiter last because
// doing so makes a reservation
if !onDemandRateLimiter.Allow() {
return fmt.Errorf("on-demand rate limit exceeded")
}
}
return nil
},
}
}
cfg := certmagic.Config{
CA: m.CA,
Email: m.Email,
Agreed: true,
RenewDurationBefore: time.Duration(m.RenewAhead),
KeyType: supportedCertKeyTypes[m.KeyType],
CertObtainTimeout: time.Duration(m.ACMETimeout),
OnDemand: ond,
MustStaple: m.MustStaple,
Storage: storage,
TrustedRoots: m.rootPool,
// TODO: listenHost
}
if m.Challenges != nil {
if m.Challenges.HTTP != nil {
cfg.DisableHTTPChallenge = m.Challenges.HTTP.Disabled
cfg.AltHTTPPort = m.Challenges.HTTP.AlternatePort
}
if m.Challenges.TLSALPN != nil {
cfg.DisableTLSALPNChallenge = m.Challenges.TLSALPN.Disabled
cfg.AltTLSALPNPort = m.Challenges.TLSALPN.AlternatePort
}
cfg.DNSProvider = m.Challenges.DNS
}
return cfg
}
// onDemandAskRequest makes a request to the ask URL
// to see if a certificate can be obtained for name.
// The certificate request should be denied if this
// returns an error.
func onDemandAskRequest(ask string, name string) error {
askURL, err := url.Parse(ask)
if err != nil {
return fmt.Errorf("parsing ask URL: %v", err)
}
qs := askURL.Query()
qs.Set("domain", name)
askURL.RawQuery = qs.Encode()
resp, err := onDemandAskClient.Get(askURL.String())
if err != nil {
return fmt.Errorf("error checking %v to deterine if certificate for hostname '%s' should be allowed: %v",
ask, name, err)
}
resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode > 299 {
return fmt.Errorf("certificate for hostname '%s' not allowed; non-2xx status code %d returned from %v",
name, resp.StatusCode, ask)
}
return nil
}
// Interface guard
var _ ManagerMaker = (*ACMEManagerMaker)(nil)
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