mirror of
https://github.com/caddyserver/caddy.git
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399 lines
14 KiB
Go
399 lines
14 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 caddytls
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"time"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/certmagic"
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"github.com/mholt/acmez"
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)
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// AutomationConfig governs the automated management of TLS certificates.
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type AutomationConfig struct {
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// The list of automation policies. The first policy matching
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// a certificate or subject name will be applied.
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Policies []*AutomationPolicy `json:"policies,omitempty"`
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// On-Demand TLS defers certificate operations to the
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// moment they are needed, e.g. during a TLS handshake.
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// Useful when you don't know all the hostnames at
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// config-time, or when you are not in control of the
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// domain names you are managing certificates for.
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// In 2015, Caddy became the first web server to
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// implement this experimental technology.
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//
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// Note that this field does not enable on-demand TLS;
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// it only configures it for when it is used. To enable
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// it, create an automation policy with `on_demand`.
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OnDemand *OnDemandConfig `json:"on_demand,omitempty"`
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// Caddy staples OCSP (and caches the response) for all
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// qualifying certificates by default. This setting
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// changes how often it scans responses for freshness,
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// and updates them if they are getting stale. Default: 1h
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OCSPCheckInterval caddy.Duration `json:"ocsp_interval,omitempty"`
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// Every so often, Caddy will scan all loaded, managed
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// certificates for expiration. This setting changes how
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// frequently the scan for expiring certificates is
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// performed. Default: 10m
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RenewCheckInterval caddy.Duration `json:"renew_interval,omitempty"`
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// How often to scan storage units for old or expired
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// assets and remove them. These scans exert lots of
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// reads (and list operations) on the storage module, so
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// choose a longer interval for large deployments.
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// Default: 24h
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//
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// Storage will always be cleaned when the process first
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// starts. Then, a new cleaning will be started this
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// duration after the previous cleaning started if the
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// previous cleaning finished in less than half the time
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// of this interval (otherwise next start will be skipped).
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StorageCleanInterval caddy.Duration `json:"storage_clean_interval,omitempty"`
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defaultPublicAutomationPolicy *AutomationPolicy
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defaultInternalAutomationPolicy *AutomationPolicy // only initialized if necessary
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}
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// AutomationPolicy designates the policy for automating the
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// management (obtaining, renewal, and revocation) of managed
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// TLS certificates.
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//
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// An AutomationPolicy value is not valid until it has been
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// provisioned; use the `AddAutomationPolicy()` method on the
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// TLS app to properly provision a new policy.
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type AutomationPolicy struct {
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// Which subjects (hostnames or IP addresses) this policy applies to.
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Subjects []string `json:"subjects,omitempty"`
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// The modules that may issue certificates. Default: internal if all
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// subjects do not qualify for public certificates; othewise acme and
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// zerossl.
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IssuersRaw []json.RawMessage `json:"issuers,omitempty" caddy:"namespace=tls.issuance inline_key=module"`
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// If true, certificates will be requested with MustStaple. Not all
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// CAs support this, and there are potentially serious consequences
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// of enabling this feature without proper threat modeling.
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MustStaple bool `json:"must_staple,omitempty"`
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// How long before a certificate's expiration to try renewing it,
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// as a function of its total lifetime. As a general and conservative
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// rule, it is a good idea to renew a certificate when it has about
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// 1/3 of its total lifetime remaining. This utilizes the majority
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// of the certificate's lifetime while still saving time to
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// troubleshoot problems. However, for extremely short-lived certs,
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// you may wish to increase the ratio to ~1/2.
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RenewalWindowRatio float64 `json:"renewal_window_ratio,omitempty"`
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// The type of key to generate for certificates.
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// Supported values: `ed25519`, `p256`, `p384`, `rsa2048`, `rsa4096`.
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KeyType string `json:"key_type,omitempty"`
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// Optionally configure a separate storage module associated with this
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// manager, instead of using Caddy's global/default-configured storage.
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StorageRaw json.RawMessage `json:"storage,omitempty" caddy:"namespace=caddy.storage inline_key=module"`
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// If true, certificates will be managed "on demand"; that is, during
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// TLS handshakes or when needed, as opposed to at startup or config
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// load.
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OnDemand bool `json:"on_demand,omitempty"`
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// Disables OCSP stapling. Disabling OCSP stapling puts clients at
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// greater risk, reduces their privacy, and usually lowers client
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// performance. It is NOT recommended to disable this unless you
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// are able to justify the costs.
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// EXPERIMENTAL. Subject to change.
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DisableOCSPStapling bool `json:"disable_ocsp_stapling,omitempty"`
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// Overrides the URLs of OCSP responders embedded in certificates.
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// Each key is a OCSP server URL to override, and its value is the
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// replacement. An empty value will disable querying of that server.
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// EXPERIMENTAL. Subject to change.
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OCSPOverrides map[string]string `json:"ocsp_overrides,omitempty"`
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// Issuers stores the decoded issuer parameters. This is only
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// used to populate an underlying certmagic.Config's Issuers
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// field; it is not referenced thereafter.
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Issuers []certmagic.Issuer `json:"-"`
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magic *certmagic.Config
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storage certmagic.Storage
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}
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// Provision sets up ap and builds its underlying CertMagic config.
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func (ap *AutomationPolicy) Provision(tlsApp *TLS) error {
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// policy-specific storage implementation
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if ap.StorageRaw != nil {
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val, err := tlsApp.ctx.LoadModule(ap, "StorageRaw")
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if err != nil {
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return fmt.Errorf("loading TLS storage module: %v", err)
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}
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cmStorage, err := val.(caddy.StorageConverter).CertMagicStorage()
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if err != nil {
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return fmt.Errorf("creating TLS storage configuration: %v", err)
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}
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ap.storage = cmStorage
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}
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var ond *certmagic.OnDemandConfig
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if ap.OnDemand {
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ond = &certmagic.OnDemandConfig{
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DecisionFunc: func(name string) error {
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// if an "ask" endpoint was defined, consult it first
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if tlsApp.Automation != nil &&
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tlsApp.Automation.OnDemand != nil &&
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tlsApp.Automation.OnDemand.Ask != "" {
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err := onDemandAskRequest(tlsApp.Automation.OnDemand.Ask, name)
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if err != nil {
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return err
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}
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}
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// check the rate limiter last because
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// doing so makes a reservation
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if !onDemandRateLimiter.Allow() {
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return fmt.Errorf("on-demand rate limit exceeded")
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}
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return nil
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},
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}
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}
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// load and provision any explicitly-configured issuer modules
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if ap.IssuersRaw != nil {
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val, err := tlsApp.ctx.LoadModule(ap, "IssuersRaw")
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if err != nil {
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return fmt.Errorf("loading TLS automation management module: %s", err)
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}
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for _, issVal := range val.([]interface{}) {
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ap.Issuers = append(ap.Issuers, issVal.(certmagic.Issuer))
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}
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}
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issuers := ap.Issuers
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if len(issuers) == 0 {
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var err error
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issuers, err = DefaultIssuersProvisioned(tlsApp.ctx)
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if err != nil {
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return err
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}
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}
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keyType := ap.KeyType
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if keyType != "" {
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var err error
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keyType, err = caddy.NewReplacer().ReplaceOrErr(ap.KeyType, true, true)
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if err != nil {
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return fmt.Errorf("invalid key type %s: %s", ap.KeyType, err)
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}
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if _, ok := supportedCertKeyTypes[keyType]; !ok {
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return fmt.Errorf("unrecognized key type: %s", keyType)
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}
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}
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keySource := certmagic.StandardKeyGenerator{
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KeyType: supportedCertKeyTypes[keyType],
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}
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storage := ap.storage
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if storage == nil {
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storage = tlsApp.ctx.Storage()
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}
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template := certmagic.Config{
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MustStaple: ap.MustStaple,
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RenewalWindowRatio: ap.RenewalWindowRatio,
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KeySource: keySource,
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OnDemand: ond,
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OCSP: certmagic.OCSPConfig{
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DisableStapling: ap.DisableOCSPStapling,
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ResponderOverrides: ap.OCSPOverrides,
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},
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Storage: storage,
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Issuers: issuers,
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Logger: tlsApp.logger,
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}
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ap.magic = certmagic.New(tlsApp.certCache, template)
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// sometimes issuers may need the parent certmagic.Config in
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// order to function properly (for example, ACMEIssuer needs
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// access to the correct storage and cache so it can solve
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// ACME challenges -- it's an annoying, inelegant circular
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// dependency that I don't know how to resolve nicely!)
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for _, issuer := range ap.magic.Issuers {
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if annoying, ok := issuer.(ConfigSetter); ok {
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annoying.SetConfig(ap.magic)
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}
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}
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return nil
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}
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// DefaultIssuers returns empty Issuers (not provisioned) to be used as defaults.
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// This function is experimental and has no compatibility promises.
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func DefaultIssuers() []certmagic.Issuer {
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return []certmagic.Issuer{
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new(ACMEIssuer),
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&ZeroSSLIssuer{ACMEIssuer: new(ACMEIssuer)},
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}
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}
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// DefaultIssuersProvisioned returns empty but provisioned default Issuers from
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// DefaultIssuers(). This function is experimental and has no compatibility promises.
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func DefaultIssuersProvisioned(ctx caddy.Context) ([]certmagic.Issuer, error) {
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issuers := DefaultIssuers()
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for i, iss := range issuers {
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if prov, ok := iss.(caddy.Provisioner); ok {
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err := prov.Provision(ctx)
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if err != nil {
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return nil, fmt.Errorf("provisioning default issuer %d: %T: %v", i, iss, err)
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}
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}
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}
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return issuers, nil
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}
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// ChallengesConfig configures the ACME challenges.
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type ChallengesConfig struct {
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// HTTP configures the ACME HTTP challenge. This
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// challenge is enabled and used automatically
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// and by default.
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HTTP *HTTPChallengeConfig `json:"http,omitempty"`
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// TLSALPN configures the ACME TLS-ALPN challenge.
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// This challenge is enabled and used automatically
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// and by default.
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TLSALPN *TLSALPNChallengeConfig `json:"tls-alpn,omitempty"`
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// Configures the ACME DNS challenge. Because this
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// challenge typically requires credentials for
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// interfacing with a DNS provider, this challenge is
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// not enabled by default. This is the only challenge
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// type which does not require a direct connection
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// to Caddy from an external server.
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//
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// NOTE: DNS providers are currently being upgraded,
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// and this API is subject to change, but should be
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// stabilized soon.
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DNS *DNSChallengeConfig `json:"dns,omitempty"`
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// Optionally customize the host to which a listener
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// is bound if required for solving a challenge.
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BindHost string `json:"bind_host,omitempty"`
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}
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// HTTPChallengeConfig configures the ACME HTTP challenge.
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type HTTPChallengeConfig struct {
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// If true, the HTTP challenge will be disabled.
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Disabled bool `json:"disabled,omitempty"`
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// An alternate port on which to service this
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// challenge. Note that the HTTP challenge port is
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// hard-coded into the spec and cannot be changed,
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// so you would have to forward packets from the
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// standard HTTP challenge port to this one.
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AlternatePort int `json:"alternate_port,omitempty"`
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}
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// TLSALPNChallengeConfig configures the ACME TLS-ALPN challenge.
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type TLSALPNChallengeConfig struct {
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// If true, the TLS-ALPN challenge will be disabled.
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Disabled bool `json:"disabled,omitempty"`
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// An alternate port on which to service this
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// challenge. Note that the TLS-ALPN challenge port
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// is hard-coded into the spec and cannot be changed,
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// so you would have to forward packets from the
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// standard TLS-ALPN challenge port to this one.
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AlternatePort int `json:"alternate_port,omitempty"`
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}
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// DNSChallengeConfig configures the ACME DNS challenge.
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//
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// NOTE: This API is still experimental and is subject to change.
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type DNSChallengeConfig struct {
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// The DNS provider module to use which will manage
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// the DNS records relevant to the ACME challenge.
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ProviderRaw json.RawMessage `json:"provider,omitempty" caddy:"namespace=dns.providers inline_key=name"`
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// The TTL of the TXT record used for the DNS challenge.
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TTL caddy.Duration `json:"ttl,omitempty"`
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// How long to wait for DNS record to propagate.
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PropagationTimeout caddy.Duration `json:"propagation_timeout,omitempty"`
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// Custom DNS resolvers to prefer over system/built-in defaults.
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// Often necessary to configure when using split-horizon DNS.
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Resolvers []string `json:"resolvers,omitempty"`
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solver acmez.Solver
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}
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// OnDemandConfig configures on-demand TLS, for obtaining
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// needed certificates at handshake-time. Because this
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// feature can easily be abused, you should use this to
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// establish rate limits and/or an internal endpoint that
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// Caddy can "ask" if it should be allowed to manage
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// certificates for a given hostname.
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type OnDemandConfig struct {
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// An optional rate limit to throttle the
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// issuance of certificates from handshakes.
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RateLimit *RateLimit `json:"rate_limit,omitempty"`
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// If Caddy needs to obtain or renew a certificate
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// during a TLS handshake, it will perform a quick
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// HTTP request to this URL to check if it should be
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// allowed to try to get a certificate for the name
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// in the "domain" query string parameter, like so:
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// `?domain=example.com`. The endpoint must return a
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// 200 OK status if a certificate is allowed;
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// anything else will cause it to be denied.
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// Redirects are not followed.
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Ask string `json:"ask,omitempty"`
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}
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// RateLimit specifies an interval with optional burst size.
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type RateLimit struct {
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// A duration value. A certificate may be obtained 'burst'
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// times during this interval.
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Interval caddy.Duration `json:"interval,omitempty"`
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// How many times during an interval a certificate can be obtained.
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Burst int `json:"burst,omitempty"`
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}
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// ConfigSetter is implemented by certmagic.Issuers that
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// need access to a parent certmagic.Config as part of
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// their provisioning phase. For example, the ACMEIssuer
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// requires a config so it can access storage and the
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// cache to solve ACME challenges.
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type ConfigSetter interface {
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SetConfig(cfg *certmagic.Config)
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}
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// These perpetual values are used for on-demand TLS.
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var (
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onDemandRateLimiter = certmagic.NewRateLimiter(0, 0)
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onDemandAskClient = &http.Client{
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Timeout: 10 * time.Second,
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CheckRedirect: func(req *http.Request, via []*http.Request) error {
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return fmt.Errorf("following http redirects is not allowed")
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},
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}
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)
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