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acmeissuer.go
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acmeissuer.go
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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 (
"context"
"crypto/x509"
"fmt"
"net/url"
"os"
"strconv"
"time"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/certmagic"
"github.com/mholt/acmez"
"github.com/mholt/acmez/acme"
"go.uber.org/zap"
)
func init() {
caddy.RegisterModule(ACMEIssuer{})
}
// ACMEIssuer manages certificates using the ACME protocol (RFC 8555).
type ACMEIssuer struct {
// The URL to the CA's ACME directory endpoint. Default:
// https://acme-v02.api.letsencrypt.org/directory
CA string `json:"ca,omitempty"`
// The URL to the test CA's ACME directory endpoint.
// This endpoint is only used during retries if there
// is a failure using the primary CA. Default:
// https://acme-staging-v02.api.letsencrypt.org/directory
TestCA string `json:"test_ca,omitempty"`
// Your email address, so the CA can contact you if necessary.
// Not required, but strongly recommended to provide one so
// you can be reached if there is a problem. Your email is
// not sent to any Caddy mothership or used for any purpose
// other than ACME transactions.
Email string `json:"email,omitempty"`
// If you have an existing account with the ACME server, put
// the private key here in PEM format. The ACME client will
// look up your account information with this key first before
// trying to create a new one. You can use placeholders here,
// for example if you have it in an environment variable.
AccountKey string `json:"account_key,omitempty"`
// If using an ACME CA that requires an external account
// binding, specify the CA-provided credentials here.
ExternalAccount *acme.EAB `json:"external_account,omitempty"`
// Time to wait before timing out an ACME operation.
// Default: 0 (no timeout)
ACMETimeout caddy.Duration `json:"acme_timeout,omitempty"`
// Configures the various ACME challenge types.
Challenges *ChallengesConfig `json:"challenges,omitempty"`
// An array of files of CA certificates to accept when connecting to the
// ACME CA. Generally, you should only use this if the ACME CA endpoint
// is internal or for development/testing purposes.
TrustedRootsPEMFiles []string `json:"trusted_roots_pem_files,omitempty"`
// Preferences for selecting alternate certificate chains, if offered
// by the CA. By default, the first offered chain will be selected.
// If configured, the chains may be sorted and the first matching chain
// will be selected.
PreferredChains *ChainPreference `json:"preferred_chains,omitempty"`
rootPool *x509.CertPool
template certmagic.ACMEIssuer
magic *certmagic.Config
logger *zap.Logger
}
// CaddyModule returns the Caddy module information.
func (ACMEIssuer) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "tls.issuance.acme",
New: func() caddy.Module { return new(ACMEIssuer) },
}
}
// Provision sets up iss.
func (iss *ACMEIssuer) Provision(ctx caddy.Context) error {
iss.logger = ctx.Logger(iss)
repl := caddy.NewReplacer()
// expand email address, if non-empty
if iss.Email != "" {
email, err := repl.ReplaceOrErr(iss.Email, true, true)
if err != nil {
return fmt.Errorf("expanding email address '%s': %v", iss.Email, err)
}
iss.Email = email
}
// expand account key, if non-empty
if iss.AccountKey != "" {
accountKey, err := repl.ReplaceOrErr(iss.AccountKey, true, true)
if err != nil {
return fmt.Errorf("expanding account key PEM '%s': %v", iss.AccountKey, err)
}
iss.AccountKey = accountKey
}
// DNS providers
if iss.Challenges != nil && iss.Challenges.DNS != nil && iss.Challenges.DNS.ProviderRaw != nil {
val, err := ctx.LoadModule(iss.Challenges.DNS, "ProviderRaw")
if err != nil {
return fmt.Errorf("loading DNS provider module: %v", err)
}
if deprecatedProvider, ok := val.(acmez.Solver); ok {
// TODO: For a temporary amount of time, we are allowing the use of DNS
// providers from go-acme/lego since there are so many providers implemented
// using that API -- they are adapted as an all-in-one Caddy module in this
// repository: https://github.com/caddy-dns/lego-deprecated - the module is a
// acmez.Solver type, so we use it directly. The user must set environment
// variables to configure it. Remove this shim once a sufficient number of
// DNS providers are implemented for the libdns APIs instead.
iss.Challenges.DNS.solver = deprecatedProvider
} else {
iss.Challenges.DNS.solver = &certmagic.DNS01Solver{
DNSProvider: val.(certmagic.ACMEDNSProvider),
TTL: time.Duration(iss.Challenges.DNS.TTL),
PropagationDelay: time.Duration(iss.Challenges.DNS.PropagationDelay),
PropagationTimeout: time.Duration(iss.Challenges.DNS.PropagationTimeout),
Resolvers: iss.Challenges.DNS.Resolvers,
OverrideDomain: iss.Challenges.DNS.OverrideDomain,
}
}
}
// add any custom CAs to trust store
if len(iss.TrustedRootsPEMFiles) > 0 {
iss.rootPool = x509.NewCertPool()
for _, pemFile := range iss.TrustedRootsPEMFiles {
pemData, err := os.ReadFile(pemFile)
if err != nil {
return fmt.Errorf("loading trusted root CA's PEM file: %s: %v", pemFile, err)
}
if !iss.rootPool.AppendCertsFromPEM(pemData) {
return fmt.Errorf("unable to add %s to trust pool: %v", pemFile, err)
}
}
}
var err error
iss.template, err = iss.makeIssuerTemplate()
if err != nil {
return err
}
return nil
}
func (iss *ACMEIssuer) makeIssuerTemplate() (certmagic.ACMEIssuer, error) {
template := certmagic.ACMEIssuer{
CA: iss.CA,
TestCA: iss.TestCA,
Email: iss.Email,
AccountKeyPEM: iss.AccountKey,
CertObtainTimeout: time.Duration(iss.ACMETimeout),
TrustedRoots: iss.rootPool,
ExternalAccount: iss.ExternalAccount,
Logger: iss.logger,
}
if iss.Challenges != nil {
if iss.Challenges.HTTP != nil {
template.DisableHTTPChallenge = iss.Challenges.HTTP.Disabled
template.AltHTTPPort = iss.Challenges.HTTP.AlternatePort
}
if iss.Challenges.TLSALPN != nil {
template.DisableTLSALPNChallenge = iss.Challenges.TLSALPN.Disabled
template.AltTLSALPNPort = iss.Challenges.TLSALPN.AlternatePort
}
if iss.Challenges.DNS != nil {
template.DNS01Solver = iss.Challenges.DNS.solver
}
template.ListenHost = iss.Challenges.BindHost
}
if iss.PreferredChains != nil {
template.PreferredChains = certmagic.ChainPreference{
Smallest: iss.PreferredChains.Smallest,
AnyCommonName: iss.PreferredChains.AnyCommonName,
RootCommonName: iss.PreferredChains.RootCommonName,
}
}
return template, nil
}
// SetConfig sets the associated certmagic config for this issuer.
// This is required because ACME needs values from the config in
// order to solve the challenges during issuance. This implements
// the ConfigSetter interface.
func (iss *ACMEIssuer) SetConfig(cfg *certmagic.Config) {
iss.magic = cfg
}
// TODO: I kind of hate how each call to these methods needs to
// make a new ACME manager to fill in defaults before using; can
// we find the right place to do that just once and then re-use?
// PreCheck implements the certmagic.PreChecker interface.
func (iss *ACMEIssuer) PreCheck(ctx context.Context, names []string, interactive bool) error {
return certmagic.NewACMEIssuer(iss.magic, iss.template).PreCheck(ctx, names, interactive)
}
// Issue obtains a certificate for the given csr.
func (iss *ACMEIssuer) Issue(ctx context.Context, csr *x509.CertificateRequest) (*certmagic.IssuedCertificate, error) {
return certmagic.NewACMEIssuer(iss.magic, iss.template).Issue(ctx, csr)
}
// IssuerKey returns the unique issuer key for the configured CA endpoint.
func (iss *ACMEIssuer) IssuerKey() string {
return certmagic.NewACMEIssuer(iss.magic, iss.template).IssuerKey()
}
// Revoke revokes the given certificate.
func (iss *ACMEIssuer) Revoke(ctx context.Context, cert certmagic.CertificateResource, reason int) error {
return certmagic.NewACMEIssuer(iss.magic, iss.template).Revoke(ctx, cert, reason)
}
// GetACMEIssuer returns iss. This is useful when other types embed ACMEIssuer, because
// type-asserting them to *ACMEIssuer will fail, but type-asserting them to an interface
// with only this method will succeed, and will still allow the embedded ACMEIssuer
// to be accessed and manipulated.
func (iss *ACMEIssuer) GetACMEIssuer() *ACMEIssuer { return iss }
// UnmarshalCaddyfile deserializes Caddyfile tokens into iss.
//
// ... acme [<directory_url>] {
// dir <directory_url>
// test_dir <test_directory_url>
// email <email>
// timeout <duration>
// disable_http_challenge
// disable_tlsalpn_challenge
// alt_http_port <port>
// alt_tlsalpn_port <port>
// eab <key_id> <mac_key>
// trusted_roots <pem_files...>
// dns <provider_name> [<options>]
// propagation_delay <duration>
// propagation_timeout <duration>
// resolvers <dns_servers...>
// dns_challenge_override_domain <domain>
// preferred_chains [smallest] {
// root_common_name <common_names...>
// any_common_name <common_names...>
// }
// }
//
func (iss *ACMEIssuer) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
for d.Next() {
if d.NextArg() {
iss.CA = d.Val()
if d.NextArg() {
return d.ArgErr()
}
}
for nesting := d.Nesting(); d.NextBlock(nesting); {
switch d.Val() {
case "dir":
if iss.CA != "" {
return d.Errf("directory is already specified: %s", iss.CA)
}
if !d.AllArgs(&iss.CA) {
return d.ArgErr()
}
case "test_dir":
if !d.AllArgs(&iss.TestCA) {
return d.ArgErr()
}
case "email":
if !d.AllArgs(&iss.Email) {
return d.ArgErr()
}
case "timeout":
var timeoutStr string
if !d.AllArgs(&timeoutStr) {
return d.ArgErr()
}
timeout, err := caddy.ParseDuration(timeoutStr)
if err != nil {
return d.Errf("invalid timeout duration %s: %v", timeoutStr, err)
}
iss.ACMETimeout = caddy.Duration(timeout)
case "disable_http_challenge":
if d.NextArg() {
return d.ArgErr()
}
if iss.Challenges == nil {
iss.Challenges = new(ChallengesConfig)
}
if iss.Challenges.HTTP == nil {
iss.Challenges.HTTP = new(HTTPChallengeConfig)
}
iss.Challenges.HTTP.Disabled = true
case "disable_tlsalpn_challenge":
if d.NextArg() {
return d.ArgErr()
}
if iss.Challenges == nil {
iss.Challenges = new(ChallengesConfig)
}
if iss.Challenges.TLSALPN == nil {
iss.Challenges.TLSALPN = new(TLSALPNChallengeConfig)
}
iss.Challenges.TLSALPN.Disabled = true
case "alt_http_port":
if !d.NextArg() {
return d.ArgErr()
}
port, err := strconv.Atoi(d.Val())
if err != nil {
return d.Errf("invalid port %s: %v", d.Val(), err)
}
if iss.Challenges == nil {
iss.Challenges = new(ChallengesConfig)
}
if iss.Challenges.HTTP == nil {
iss.Challenges.HTTP = new(HTTPChallengeConfig)
}
iss.Challenges.HTTP.AlternatePort = port
case "alt_tlsalpn_port":
if !d.NextArg() {
return d.ArgErr()
}
port, err := strconv.Atoi(d.Val())
if err != nil {
return d.Errf("invalid port %s: %v", d.Val(), err)
}
if iss.Challenges == nil {
iss.Challenges = new(ChallengesConfig)
}
if iss.Challenges.TLSALPN == nil {
iss.Challenges.TLSALPN = new(TLSALPNChallengeConfig)
}
iss.Challenges.TLSALPN.AlternatePort = port
case "eab":
iss.ExternalAccount = new(acme.EAB)
if !d.AllArgs(&iss.ExternalAccount.KeyID, &iss.ExternalAccount.MACKey) {
return d.ArgErr()
}
case "trusted_roots":
iss.TrustedRootsPEMFiles = d.RemainingArgs()
case "dns":
if !d.NextArg() {
return d.ArgErr()
}
provName := d.Val()
if iss.Challenges == nil {
iss.Challenges = new(ChallengesConfig)
}
if iss.Challenges.DNS == nil {
iss.Challenges.DNS = new(DNSChallengeConfig)
}
unm, err := caddyfile.UnmarshalModule(d, "dns.providers."+provName)
if err != nil {
return err
}
iss.Challenges.DNS.ProviderRaw = caddyconfig.JSONModuleObject(unm, "name", provName, nil)
case "propagation_delay":
if !d.NextArg() {
return d.ArgErr()
}
delayStr := d.Val()
delay, err := caddy.ParseDuration(delayStr)
if err != nil {
return d.Errf("invalid propagation_delay duration %s: %v", delayStr, err)
}
if iss.Challenges == nil {
iss.Challenges = new(ChallengesConfig)
}
if iss.Challenges.DNS == nil {
iss.Challenges.DNS = new(DNSChallengeConfig)
}
iss.Challenges.DNS.PropagationDelay = caddy.Duration(delay)
case "propagation_timeout":
if !d.NextArg() {
return d.ArgErr()
}
timeoutStr := d.Val()
var timeout time.Duration
if timeoutStr == "-1" {
timeout = time.Duration(-1)
} else {
var err error
timeout, err = caddy.ParseDuration(timeoutStr)
if err != nil {
return d.Errf("invalid propagation_timeout duration %s: %v", timeoutStr, err)
}
}
if iss.Challenges == nil {
iss.Challenges = new(ChallengesConfig)
}
if iss.Challenges.DNS == nil {
iss.Challenges.DNS = new(DNSChallengeConfig)
}
iss.Challenges.DNS.PropagationTimeout = caddy.Duration(timeout)
case "resolvers":
if iss.Challenges == nil {
iss.Challenges = new(ChallengesConfig)
}
if iss.Challenges.DNS == nil {
iss.Challenges.DNS = new(DNSChallengeConfig)
}
iss.Challenges.DNS.Resolvers = d.RemainingArgs()
if len(iss.Challenges.DNS.Resolvers) == 0 {
return d.ArgErr()
}
case "dns_challenge_override_domain":
arg := d.RemainingArgs()
if len(arg) != 1 {
return d.ArgErr()
}
if iss.Challenges == nil {
iss.Challenges = new(ChallengesConfig)
}
if iss.Challenges.DNS == nil {
iss.Challenges.DNS = new(DNSChallengeConfig)
}
iss.Challenges.DNS.OverrideDomain = arg[0]
case "preferred_chains":
chainPref, err := ParseCaddyfilePreferredChainsOptions(d)
if err != nil {
return err
}
iss.PreferredChains = chainPref
default:
return d.Errf("unrecognized ACME issuer property: %s", d.Val())
}
}
}
return nil
}
// 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 determine 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
}
func ParseCaddyfilePreferredChainsOptions(d *caddyfile.Dispenser) (*ChainPreference, error) {
chainPref := new(ChainPreference)
if d.NextArg() {
smallestOpt := d.Val()
if smallestOpt == "smallest" {
trueBool := true
chainPref.Smallest = &trueBool
if d.NextArg() { // Only one argument allowed
return nil, d.ArgErr()
}
if d.NextBlock(d.Nesting()) { // Don't allow other options when smallest == true
return nil, d.Err("No more options are accepted when using the 'smallest' option")
}
} else { // Smallest option should always be 'smallest' or unset
return nil, d.Errf("Invalid argument '%s'", smallestOpt)
}
}
for nesting := d.Nesting(); d.NextBlock(nesting); {
switch d.Val() {
case "root_common_name":
rootCommonNameOpt := d.RemainingArgs()
chainPref.RootCommonName = rootCommonNameOpt
if rootCommonNameOpt == nil {
return nil, d.ArgErr()
}
if chainPref.AnyCommonName != nil {
return nil, d.Err("Can't set root_common_name when any_common_name is already set")
}
case "any_common_name":
anyCommonNameOpt := d.RemainingArgs()
chainPref.AnyCommonName = anyCommonNameOpt
if anyCommonNameOpt == nil {
return nil, d.ArgErr()
}
if chainPref.RootCommonName != nil {
return nil, d.Err("Can't set any_common_name when root_common_name is already set")
}
default:
return nil, d.Errf("Received unrecognized parameter '%s'", d.Val())
}
}
if chainPref.Smallest == nil && chainPref.RootCommonName == nil && chainPref.AnyCommonName == nil {
return nil, d.Err("No options for preferred_chains received")
}
return chainPref, nil
}
// ChainPreference describes the client's preferred certificate chain,
// useful if the CA offers alternate chains. The first matching chain
// will be selected.
type ChainPreference struct {
// Prefer chains with the fewest number of bytes.
Smallest *bool `json:"smallest,omitempty"`
// Select first chain having a root with one of
// these common names.
RootCommonName []string `json:"root_common_name,omitempty"`
// Select first chain that has any issuer with one
// of these common names.
AnyCommonName []string `json:"any_common_name,omitempty"`
}
// Interface guards
var (
_ certmagic.PreChecker = (*ACMEIssuer)(nil)
_ certmagic.Issuer = (*ACMEIssuer)(nil)
_ certmagic.Revoker = (*ACMEIssuer)(nil)
_ caddy.Provisioner = (*ACMEIssuer)(nil)
_ ConfigSetter = (*ACMEIssuer)(nil)
_ caddyfile.Unmarshaler = (*ACMEIssuer)(nil)
)