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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"
"strconv"
"time"
"github.com/caddyserver/certmagic"
"go.uber.org/zap"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
)
func init() {
caddy.RegisterModule(new(ZeroSSLIssuer))
}
// ZeroSSLIssuer uses the ZeroSSL API to get certificates.
// Note that this is distinct from ZeroSSL's ACME endpoint.
// To use ZeroSSL's ACME endpoint, use the ACMEIssuer
// configured with ZeroSSL's ACME directory endpoint.
type ZeroSSLIssuer struct {
// The API key (or "access key") for using the ZeroSSL API.
// REQUIRED.
APIKey string `json:"api_key,omitempty"`
// How many days the certificate should be valid for.
// Only certain values are accepted; see ZeroSSL docs.
ValidityDays int `json:"validity_days,omitempty"`
// The host to bind to when opening a listener for
// verifying domain names (or IPs).
ListenHost string `json:"listen_host,omitempty"`
// If HTTP is forwarded from port 80, specify the
// forwarded port here.
AlternateHTTPPort int `json:"alternate_http_port,omitempty"`
// Use CNAME validation instead of HTTP. ZeroSSL's
// API uses CNAME records for DNS validation, similar
// to how Let's Encrypt uses TXT records for the
// DNS challenge.
CNAMEValidation *DNSChallengeConfig `json:"cname_validation,omitempty"`
logger *zap.Logger
storage certmagic.Storage
issuer *certmagic.ZeroSSLIssuer
}
// CaddyModule returns the Caddy module information.
func (*ZeroSSLIssuer) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "tls.issuance.zerossl",
New: func() caddy.Module { return new(ZeroSSLIssuer) },
}
}
// Provision sets up the issuer.
func (iss *ZeroSSLIssuer) Provision(ctx caddy.Context) error {
iss.logger = ctx.Logger()
iss.storage = ctx.Storage()
repl := caddy.NewReplacer()
var dnsManager *certmagic.DNSManager
if iss.CNAMEValidation != nil && len(iss.CNAMEValidation.ProviderRaw) > 0 {
val, err := ctx.LoadModule(iss.CNAMEValidation, "ProviderRaw")
if err != nil {
return fmt.Errorf("loading DNS provider module: %v", err)
}
dnsManager = &certmagic.DNSManager{
DNSProvider: val.(certmagic.DNSProvider),
TTL: time.Duration(iss.CNAMEValidation.TTL),
PropagationDelay: time.Duration(iss.CNAMEValidation.PropagationDelay),
PropagationTimeout: time.Duration(iss.CNAMEValidation.PropagationTimeout),
Resolvers: iss.CNAMEValidation.Resolvers,
OverrideDomain: iss.CNAMEValidation.OverrideDomain,
Logger: iss.logger.Named("cname"),
}
}
iss.issuer = &certmagic.ZeroSSLIssuer{
APIKey: repl.ReplaceAll(iss.APIKey, ""),
ValidityDays: iss.ValidityDays,
ListenHost: iss.ListenHost,
AltHTTPPort: iss.AlternateHTTPPort,
Storage: iss.storage,
CNAMEValidation: dnsManager,
Logger: iss.logger,
}
return nil
}
// Issue obtains a certificate for the given csr.
func (iss *ZeroSSLIssuer) Issue(ctx context.Context, csr *x509.CertificateRequest) (*certmagic.IssuedCertificate, error) {
return iss.issuer.Issue(ctx, csr)
}
// IssuerKey returns the unique issuer key for the configured CA endpoint.
func (iss *ZeroSSLIssuer) IssuerKey() string {
return iss.issuer.IssuerKey()
}
// Revoke revokes the given certificate.
func (iss *ZeroSSLIssuer) Revoke(ctx context.Context, cert certmagic.CertificateResource, reason int) error {
return iss.issuer.Revoke(ctx, cert, reason)
}
// UnmarshalCaddyfile deserializes Caddyfile tokens into iss.
//
// ... zerossl <api_key> {
// validity_days <days>
// alt_http_port <port>
// dns <provider_name> ...
// propagation_delay <duration>
// propagation_timeout <duration>
// resolvers <list...>
// dns_ttl <duration>
// }
func (iss *ZeroSSLIssuer) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
d.Next() // consume issuer name
// API key is required
if !d.NextArg() {
return d.ArgErr()
}
iss.APIKey = d.Val()
if d.NextArg() {
return d.ArgErr()
}
for nesting := d.Nesting(); d.NextBlock(nesting); {
switch d.Val() {
case "validity_days":
if iss.ValidityDays != 0 {
return d.Errf("validity days is already specified: %d", iss.ValidityDays)
}
days, err := strconv.Atoi(d.Val())
if err != nil {
return d.Errf("invalid number of days %s: %v", d.Val(), err)
}
iss.ValidityDays = days
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)
}
iss.AlternateHTTPPort = port
case "dns":
if !d.NextArg() {
return d.ArgErr()
}
provName := d.Val()
if iss.CNAMEValidation == nil {
iss.CNAMEValidation = new(DNSChallengeConfig)
}
unm, err := caddyfile.UnmarshalModule(d, "dns.providers."+provName)
if err != nil {
return err
}
iss.CNAMEValidation.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.CNAMEValidation == nil {
iss.CNAMEValidation = new(DNSChallengeConfig)
}
iss.CNAMEValidation.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.CNAMEValidation == nil {
iss.CNAMEValidation = new(DNSChallengeConfig)
}
iss.CNAMEValidation.PropagationTimeout = caddy.Duration(timeout)
case "resolvers":
if iss.CNAMEValidation == nil {
iss.CNAMEValidation = new(DNSChallengeConfig)
}
iss.CNAMEValidation.Resolvers = d.RemainingArgs()
if len(iss.CNAMEValidation.Resolvers) == 0 {
return d.ArgErr()
}
case "dns_ttl":
if !d.NextArg() {
return d.ArgErr()
}
ttlStr := d.Val()
ttl, err := caddy.ParseDuration(ttlStr)
if err != nil {
return d.Errf("invalid dns_ttl duration %s: %v", ttlStr, err)
}
if iss.CNAMEValidation == nil {
iss.CNAMEValidation = new(DNSChallengeConfig)
}
iss.CNAMEValidation.TTL = caddy.Duration(ttl)
default:
return d.Errf("unrecognized zerossl issuer property: %s", d.Val())
}
}
return nil
}
// Interface guards
var (
_ certmagic.Issuer = (*ZeroSSLIssuer)(nil)
_ certmagic.Revoker = (*ZeroSSLIssuer)(nil)
_ caddy.Provisioner = (*ZeroSSLIssuer)(nil)
)
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