.gitlab-ci.yml

+include:
+  - "https://git.autistici.org/pipelines/debian/raw/master/common.yml"
+  - "https://git.autistici.org/pipelines/images/test/golang/raw/master/ci.yml"

acme.go

@@ -133,10 +133,16 @@ func (a *ACME) acmeClient(ctx context.Context) (*acme.Client, error) {
 	// account is already registered we get a StatusConflict,
 	// which we can ignore.
 	_, err = client.Register(ctx, ac, func(_ string) bool { return true })
-	if ae, ok := err.(*acme.Error); err == nil || ok && ae.StatusCode == http.StatusConflict {
+	if ae, ok := err.(*acme.Error); err == nil || err == acme.ErrAccountAlreadyExists || (ok && ae.StatusCode == http.StatusConflict) {
 		a.client = client
 		err = nil
 	}
+
+	// Fetch account info and display it.
+	if acct, err := client.GetReg(ctx, ""); err == nil {
+		log.Printf("ACME account %s", acct.URI)
+	}
+
 	return a.client, err
 }
 
@@ -149,7 +155,8 @@ func (a *ACME) GetCertificate(ctx context.Context, key crypto.Signer, c *certCon
 		return nil, nil, err
 	}
 
-	if err = a.verifyAll(ctx, client, c); err != nil {
+	o, err := a.verifyAll(ctx, client, c)
+	if err != nil {
 		return nil, nil, err
 	}
 
@@ -157,7 +164,7 @@ func (a *ACME) GetCertificate(ctx context.Context, key crypto.Signer, c *certCon
 	if err != nil {
 		return nil, nil, err
 	}
-	der, _, err = client.CreateCert(ctx, csr, 0, true)
+	der, _, err = client.CreateOrderCert(ctx, o.FinalizeURL, csr, true)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -168,56 +175,67 @@ func (a *ACME) GetCertificate(ctx context.Context, key crypto.Signer, c *certCon
 	return der, leaf, nil
 }
 
-func (a *ACME) verifyAll(ctx context.Context, client *acme.Client, c *certConfig) error {
-	for _, domain := range c.Names {
-		if err := a.verify(ctx, client, c, domain); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-func (a *ACME) verify(ctx context.Context, client *acme.Client, c *certConfig, domain string) error {
+func (a *ACME) verifyAll(ctx context.Context, client *acme.Client, c *certConfig) (*acme.Order, error) {
 	// Make an authorization request to the ACME server, and
 	// verify that it returns a valid response with challenges.
-	authz, err := client.Authorize(ctx, domain)
+	o, err := client.AuthorizeOrder(ctx, acme.DomainIDs(c.Names...))
 	if err != nil {
-		return err
+		return nil, fmt.Errorf("AuthorizeOrder failed: %v", err)
 	}
-	switch authz.Status {
-	case acme.StatusValid:
-		return nil // already authorized
-	case acme.StatusInvalid:
-		return fmt.Errorf("invalid authorization %q", authz.URI)
+
+	switch o.Status {
+	case acme.StatusReady:
+		return o, nil // already authorized
+	case acme.StatusPending:
+	default:
+		return nil, fmt.Errorf("invalid new order status %q", o.Status)
 	}
 
+	for _, zurl := range o.AuthzURLs {
+		z, err := client.GetAuthorization(ctx, zurl)
+		if err != nil {
+			return nil, fmt.Errorf("GetAuthorization(%s) failed: %v", zurl, err)
+		}
+		if z.Status != acme.StatusPending {
+			continue
+		}
 		// Pick a challenge that matches our preferences and the
 		// available validators. The validator fulfills the challenge,
 		// and returns a cleanup function that we're going to call
 		// before we return. All steps are sequential and idempotent.
-	chal := a.pickChallenge(authz.Challenges, c)
+		chal := a.pickChallenge(z.Challenges, c)
 		if chal == nil {
-		return fmt.Errorf("unable to authorize %q", domain)
+			return nil, fmt.Errorf("unable to authorize %q", c.Names)
 		}
+
 		v, ok := a.validators[chal.Type]
 		if !ok {
-		return fmt.Errorf("challenge type '%s' is not available", chal.Type)
+			return nil, fmt.Errorf("challenge type '%s' is not available", chal.Type)
 		}
+
+		log.Printf("attempting fulfillment for %q (identifier: %+v)", c.Names, z.Identifier)
+		for _, domain := range c.Names {
 			cleanup, err := v.Fulfill(ctx, client, domain, chal)
 			if err != nil {
-		return err
+				return nil, fmt.Errorf("fulfillment failed: %v", err)
 			}
 			defer cleanup()
+		}
 
-	// Tell the ACME server that we've accepted the challenge, and
-	// then wait, possibly for some time, until there is an
-	// authorization response (either successful or not) from the
-	// server.
-	if _, err = client.Accept(ctx, chal); err != nil {
-		return err
+		if _, err := client.Accept(ctx, chal); err != nil {
+			return nil, fmt.Errorf("challenge accept failed: %v", err)
+		}
+		if _, err := client.WaitAuthorization(ctx, z.URI); err != nil {
+			return nil, fmt.Errorf("WaitAuthorization(%s) failed: %v", z.URI, err)
+		}
+	}
+
+	// Authorizations are satisfied, wait for the CA
+	// to update the order status.
+	if _, err = client.WaitOrder(ctx, o.URI); err != nil {
+		return nil, err
 	}
-	_, err = client.WaitAuthorization(ctx, authz.URI)
-	return err
+	return o, nil
 }
 
 // Pick a challenge with the right type from the Challenge response

cmd/acmeserver/acmeserver.go

@@ -3,16 +3,15 @@ package main
 import (
 	"context"
 	"flag"
-	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
 	"os/signal"
 	"syscall"
 
-	"git.autistici.org/ai3/acmeserver"
 	"git.autistici.org/ai3/go-common/serverutil"
-	"gopkg.in/yaml.v2"
+	"git.autistici.org/ai3/tools/acmeserver"
+	"gopkg.in/yaml.v3"
 )
 
 var (
@@ -23,18 +22,19 @@ var (
 // Config ties together the acmeserver Config and the standard
 // serverutil HTTP server configuration.
 type Config struct {
-	ACME   *acmeserver.Config       `yaml:",inline"`
+	ACME   acmeserver.Config        `yaml:",inline"`
 	Server *serverutil.ServerConfig `yaml:"http_server"`
 }
 
 func loadConfig(path string) (*Config, error) {
 	// Read YAML config.
-	data, err := ioutil.ReadFile(path) // nolint: gosec
+	f, err := os.Open(path)
 	if err != nil {
 		return nil, err
 	}
+	defer f.Close()
 	var config Config
-	if err := yaml.Unmarshal(data, &config); err != nil {
+	if err := yaml.NewDecoder(f).Decode(&config); err != nil {
 		return nil, err
 	}
 	return &config, nil
@@ -52,7 +52,7 @@ func main() {
 	var h http.Handler
 	var cg acmeserver.CertGenerator
 	if !config.ACME.Testing {
-		acme, err := acmeserver.NewACME(config.ACME) // nolint: vetshadow
+		acme, err := acmeserver.NewACME(&config.ACME) // nolint: vetshadow
 		if err != nil {
 			log.Fatal(err)
 		}
@@ -69,7 +69,7 @@ func main() {
 		})
 	}
 
-	m, err := acmeserver.NewManager(config.ACME, cg)
+	m, err := acmeserver.NewManager(&config.ACME, cg)
 	if err != nil {
 		log.Fatal(err)
 	}

config.go

@@ -3,11 +3,11 @@ package acmeserver
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"log"
+	"os"
 	"path/filepath"
 
-	"gopkg.in/yaml.v2"
+	"gopkg.in/yaml.v3"
 
 	"git.autistici.org/ai3/go-common/clientutil"
 )
@@ -77,12 +77,13 @@ func (c *certConfig) check() error {
 }
 
 func readCertConfigs(path string) ([]*certConfig, error) {
-	data, err := ioutil.ReadFile(path) // nolint: gosec
+	f, err := os.Open(path)
 	if err != nil {
 		return nil, err
 	}
+	defer f.Close()
 	var cc []*certConfig
-	if err := yaml.Unmarshal(data, &cc); err != nil {
+	if err := yaml.NewDecoder(f).Decode(&cc); err != nil {
 		return nil, err
 	}
 	return cc, nil

debian/acmeserver.service

@@ -7,6 +7,7 @@ User=acmeserver
 Group=acmeserver
 EnvironmentFile=-/etc/default/acmeserver
 ExecStart=/usr/bin/acmeserver --addr $ADDR
+ExecReload=/bin/kill -HUP $MAINPID
 Restart=always
 
 # Hardening
@@ -16,6 +17,7 @@ PrivateDevices=yes
 ProtectHome=yes
 ProtectSystem=full
 ReadOnlyDirectories=/
+ReadWriteDirectories=/var/lib/acme
 CapabilityBoundingSet=CAP_NET_BIND_SERVICE
 
 [Install]

debian/changelog

@@ -2,4 +2,4 @@ acmeserver (2.0) unstable; urgency=medium
 
   * Initial Release.
 
- -- Autistici/Inventati <debian@autistici.org>  Sat, 15 Jun 2018 09:23:40 +0000
+ -- Autistici/Inventati <debian@autistici.org>  Fri, 15 Jun 2018 09:23:40 +0000

debian/compat

-10

debian/control

@@ -2,12 +2,12 @@ Source: acmeserver
 Section: admin
 Priority: optional
 Maintainer: Autistici/Inventati <debian@autistici.org>
-Build-Depends: debhelper (>=9), golang-go, dh-systemd, dh-golang
+Build-Depends: debhelper-compat (= 13), golang-any (>= 1.11), dh-golang
 Standards-Version: 3.9.6
 
 Package: acmeserver
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
+Built-Using: ${misc:Built-Using}
 Description: ACME server
  Automatically manages and renews public SSL certificates.
-

debian/copyright

 Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: acmeserver
-Source: <https://git.autistici.org/ai3/acmeserver>
+Source: <https://git.autistici.org/ai3/tools/acmeserver>
 
 Files: *
 Copyright: 2018 Autistici/Inventati <info@autistici.org>

debian/rules

 #!/usr/bin/make -f
 
-export DH_GOPKG = git.autistici.org/ai3/acmeserver
+export DH_GOPKG = git.autistici.org/ai3/tools/acmeserver
 export DH_GOLANG_EXCLUDES = vendor
+export DH_GOLANG_INSTALL_ALL := 1
 
 
 %:
-	dh $@ --with systemd --with golang --buildsystem golang
+	dh $@ --with golang --buildsystem golang
 
-override_dh_install:
-	rm -fr $(CURDIR)/debian/acmeserver/usr/share/gocode
-	dh_install
+override_dh_auto_install:
+	dh_auto_install -- --no-source
 
-override_dh_systemd_enable:
-	dh_systemd_enable --no-enable
-
-override_dh_systemd_start:
-	dh_systemd_start --no-start
+override_dh_installsystemd:
+	dh_installsystemd --no-enable
 
+override_dh_installsystemd:
+	dh_installsystemd --no-start

dns_challenge.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/miekg/dns"
 	"golang.org/x/crypto/acme"
+	"golang.org/x/net/publicsuffix"
 )
 
 const (
@@ -87,8 +88,16 @@ func (d *dnsValidator) client() *dns.Client {
 }
 
 func (d *dnsValidator) Fulfill(ctx context.Context, client *acme.Client, domain string, chal *acme.Challenge) (func(), error) {
-	zone := domain[strings.Index(domain, ".")+1:]
-	fqdn := dns.Fqdn(domain)
+	domain = strings.TrimPrefix(domain, "*.")
+
+	zone, err := publicsuffix.EffectiveTLDPlusOne(domain)
+	if err != nil {
+		return nil, fmt.Errorf("could not determine effective tld: %w", err)
+	}
+
+	zone = dns.Fqdn(zone)
+	fqdn := dns.Fqdn("_acme-challenge." + domain)
+
 	value, err := client.DNS01ChallengeRecord(chal.Token)
 	if err != nil {
 		return nil, err
@@ -109,6 +118,7 @@ func (d *dnsValidator) Fulfill(ctx context.Context, client *acme.Client, domain
 }
 
 func (d *dnsValidator) updateNS(ctx context.Context, ns, zone, fqdn, value string, remove bool) error {
+	log.Printf("updateNS(%s, %s, %s, %s, %v)", ns, zone, fqdn, value, remove)
 	rrs := d.makeRR(fqdn, value, rfc2136Timeout)
 	m := d.makeMsg(zone, rrs, remove)
 	c := d.client()

go.mod

+module git.autistici.org/ai3/tools/acmeserver
+
+go 1.19
+
+require (
+	git.autistici.org/ai3/go-common v0.0.0-20230816213645-b3aa3fb514d6
+	git.autistici.org/ai3/tools/replds v0.0.0-20230923170339-b6e6e3cc032b
+	github.com/miekg/dns v1.1.50
+	github.com/prometheus/client_golang v1.12.2
+	golang.org/x/crypto v0.24.0
+	golang.org/x/net v0.26.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/NYTimes/gziphandler v1.1.1 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cenkalti/backoff/v4 v4.1.3 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
+	github.com/felixge/httpsnoop v1.0.3 // indirect
+	github.com/go-logr/logr v1.2.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/openzipkin/zipkin-go v0.4.0 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.32.1 // indirect
+	github.com/prometheus/procfs v0.7.3 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.34.0 // indirect
+	go.opentelemetry.io/contrib/propagators/b3 v1.9.0 // indirect
+	go.opentelemetry.io/otel v1.10.0 // indirect
+	go.opentelemetry.io/otel/exporters/zipkin v1.9.0 // indirect
+	go.opentelemetry.io/otel/metric v0.31.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.10.0 // indirect
+	go.opentelemetry.io/otel/trace v1.10.0 // indirect
+	golang.org/x/mod v0.4.2 // indirect
+	golang.org/x/sync v0.3.0 // indirect
+	golang.org/x/sys v0.21.0 // indirect
+	golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
+)

manager.go

@@ -16,10 +16,15 @@ import (
 	"sync"
 	"time"
 
-	"git.autistici.org/ai3/replds"
+	"git.autistici.org/ai3/tools/replds"
 	"github.com/prometheus/client_golang/prometheus"
 )
 
+var (
+	defaultRenewalDays = 21
+	updateInterval     = 1 * time.Minute
+)
+
 // certInfo represents what we know about the state of the certificate
 // at runtime.
 type certInfo struct {
@@ -71,18 +76,19 @@ type CertGenerator interface {
 	GetCertificate(context.Context, crypto.Signer, *certConfig) ([][]byte, *x509.Certificate, error)
 }
 
-// Manager periodically renews certificates before they expire, and
-// responds to http-01 validation requests.
+// Manager periodically renews certificates before they expire.
 type Manager struct {
 	configDirs  []string
 	useRSA      bool
 	storage     certStorage
-	certs       []*certInfo
 	certGen     CertGenerator
 	renewalDays int
 
 	configCh chan []*certConfig
 	doneCh   chan bool
+
+	mx    sync.Mutex
+	certs []*certInfo
 }
 
 // NewManager creates a new Manager with the given configuration.
@@ -94,6 +100,9 @@ func NewManager(config *Config, certGen CertGenerator) (*Manager, error) {
 	if config.Output.Path == "" {
 		return nil, errors.New("'output.path' is unset")
 	}
+	if config.RenewalDays <= 0 {
+		config.RenewalDays = defaultRenewalDays
+	}
 
 	m := &Manager{
 		useRSA:      config.UseRSA,
@@ -103,9 +112,6 @@ func NewManager(config *Config, certGen CertGenerator) (*Manager, error) {
 		certGen:     certGen,
 		renewalDays: config.RenewalDays,
 	}
-	if m.renewalDays <= 0 {
-		m.renewalDays = 15
-	}
 
 	ds := &dirStorage{root: config.Output.Path}
 	if config.Output.ReplDS == nil {
@@ -158,7 +164,7 @@ func (m *Manager) Reload() {
 
 var (
 	renewalTimeout    = 10 * time.Minute
-	errorRetryTimeout = 10 * time.Minute
+	errorRetryTimeout = 6 * time.Hour
 )
 
 func (m *Manager) updateAllCerts(ctx context.Context, certs []*certInfo) {
@@ -241,55 +247,41 @@ func (m *Manager) loadConfig(certs []*certConfig) []*certInfo {
 	return out
 }
 
+func (m *Manager) getCerts() []*certInfo {
+	m.mx.Lock()
+	defer m.mx.Unlock()
+	return m.certs
+}
+
+func (m *Manager) setCerts(certs []*certInfo) {
+	m.mx.Lock()
+	m.certs = certs
+	m.mx.Unlock()
+}
+
 // This channel is used by the testing code to trigger an update,
 // without having to wait for the timer to tick.
 var testUpdateCh = make(chan bool)
 
 func (m *Manager) loop(ctx context.Context) {
-	// Updates are long-term jobs, so they should be
-	// interruptible. We run updates in a separate goroutine, and
-	// cancel them when the configuration is reloaded or on exit.
-	var upCancel context.CancelFunc
-	var wg sync.WaitGroup
-
-	startUpdate := func(certs []*certInfo) context.CancelFunc {
-		// Ensure the previous update has finished.
-		wg.Wait()
-
-		upCtx, cancel := context.WithCancel(ctx)
-		wg.Add(1)
+	reloadCh := make(chan interface{}, 1)
 	go func() {
-			m.updateAllCerts(upCtx, certs)
-			wg.Done()
-		}()
-		return cancel
-	}
-
-	// Cancel the running update, if any. Called on config
-	// updates, when exiting.
-	cancelUpdate := func() {
-		if upCancel != nil {
-			upCancel()
+		for config := range m.configCh {
+			certs := m.loadConfig(config)
+			m.setCerts(certs)
+			reloadCh <- certs
 		}
-		wg.Wait()
-	}
-	defer cancelUpdate()
+	}()
 
-	tick := time.NewTicker(5 * time.Minute)
-	defer tick.Stop()
-	for {
-		select {
-		case <-tick.C:
-			upCancel = startUpdate(m.certs)
-		case <-testUpdateCh:
-			upCancel = startUpdate(m.certs)
-		case certDomains := <-m.configCh:
-			cancelUpdate()
-			m.certs = m.loadConfig(certDomains)
-		case <-ctx.Done():
-			return
-		}
-	}
+	runWithUpdates(
+		ctx,
+		func(ctx context.Context, value interface{}) {
+			certs := value.([]*certInfo)
+			m.updateAllCerts(ctx, certs)
+		},
+		reloadCh,
+		updateInterval,
+	)
 }
 
 func concatDER(der [][]byte) []byte {
@@ -309,9 +301,7 @@ func concatDER(der [][]byte) []byte {
 func certRequest(key crypto.Signer, domains []string) ([]byte, error) {
 	req := &x509.CertificateRequest{
 		Subject:  pkix.Name{CommonName: domains[0]},
-	}
-	if len(domains) > 1 {
-		req.DNSNames = domains[1:]
+		DNSNames: domains,
 	}
 	return x509.CreateCertificateRequest(rand.Reader, req, key)
 }

manager_test.go

@@ -77,36 +77,44 @@ func TestManager_Reload(t *testing.T) {
 	defer cleanup()
 
 	// Data race: we read data owned by another goroutine!
-	if len(m.certs) < 1 {
+	certs := m.getCerts()
+	if len(certs) < 1 {
 		t.Fatal("configuration not loaded?")
 	}
-	if m.certs[0].cn() != "example.com" {
-		t.Fatalf("certs[0].cn() is %s, expected example.com", m.certs[0].cn())
+	if certs[0].cn() != "example.com" {
+		t.Fatalf("certs[0].cn() is %s, expected example.com", certs[0].cn())
 	}
 
 	// Try a reload, catch obvious errors.
 	m.Reload()
 	time.Sleep(50 * time.Millisecond)
+	certs = m.getCerts()
 
-	if len(m.certs) != 1 {
+	if len(certs) != 1 {
 		t.Fatalf("certs count is %d, expected 1", len(m.certs))
 	}
-	if m.certs[0].cn() != "example.com" {
-		t.Fatalf("certs[0].cn() is %s, expected example.com", m.certs[0].cn())
+	if certs[0].cn() != "example.com" {
+		t.Fatalf("certs[0].cn() is %s, expected example.com", certs[0].cn())
 	}
 }
 
 func TestManager_NewCert(t *testing.T) {
+	var oldUpdateInterval time.Duration
+	oldUpdateInterval, updateInterval = updateInterval, 50*time.Millisecond
+	defer func() {
+		updateInterval = oldUpdateInterval
+	}()
+
 	cleanup, _, m := newTestManager(t, NewSelfSignedCertGenerator())
 	defer cleanup()
 
 	now := time.Now()
-	ci := m.certs[0]
+	certs := m.getCerts()
+	ci := certs[0]
 	if ci.retryDeadline.After(now) {
 		t.Fatalf("retry deadline is in the future: %v", ci.retryDeadline)
 	}
 
-	testUpdateCh <- true
 	time.Sleep(100 * time.Millisecond)
 
 	// Verify that the retry/renewal timestamp is in the future.
@@ -125,7 +133,7 @@ func TestManager_NewCert(t *testing.T) {
 	if _, err := os.Stat(p); err != nil {
 		t.Fatalf("file not created: %v", err)
 	}
-	p = filepath.Join(m.configDirs[0], "../certs/example.com/private_key.pem")
+	p = filepath.Join(m.configDirs[0], "../certs/example.com/privkey.pem")
 	if _, err := os.Stat(p); err != nil {
 		t.Fatalf("file not created: %v", err)
 	}
@@ -135,7 +143,7 @@ func TestManager_NewCert(t *testing.T) {
 	m.Reload()
 	time.Sleep(50 * time.Millisecond)
 
-	ci = m.certs[0]
+	ci = m.getCerts()[0]
 	if !ci.valid {
 		t.Fatal("certificate is invalid after a reload")
 	}

renovate.json

+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base"
+  ]
+}

storage.go

@@ -16,7 +16,7 @@ import (
 	"strings"
 	"time"
 
-	"git.autistici.org/ai3/replds"
+	"git.autistici.org/ai3/tools/replds"
 )
 
 type dirStorage struct {
@@ -25,7 +25,7 @@ type dirStorage struct {
 
 func (d *dirStorage) GetCert(cn string) ([][]byte, crypto.Signer, error) {
 	certPath := filepath.Join(d.root, cn, "fullchain.pem")
-	keyPath := filepath.Join(d.root, cn, "private_key.pem")
+	keyPath := filepath.Join(d.root, cn, "privkey.pem")
 
 	der, err := parseCertsFromFile(certPath)
 	if err != nil {
@@ -53,7 +53,7 @@ func (d *dirStorage) PutCert(cn string, der [][]byte, key crypto.Signer) error {
 
 	for path, data := range filemap {
 		var mode os.FileMode = 0644
-		if strings.HasSuffix(path, "private_key.pem") {
+		if strings.HasSuffix(path, "privkey.pem") {
 			mode = 0400
 		}
 		log.Printf("writing %s (%03o)", path, mode)
@@ -79,11 +79,19 @@ func dumpCertsAndKey(cn string, der [][]byte, key crypto.Signer) (map[string][]b
 	}
 	m[filepath.Join(cn, "cert.pem")] = data
 
+	if len(der) > 1 {
+		data, err = encodeCerts(der[1:])
+		if err != nil {
+			return nil, err
+		}
+		m[filepath.Join(cn, "chain.pem")] = data
+	}
+
 	data, err = encodePrivateKey(key)
 	if err != nil {
 		return nil, err
 	}
-	m[filepath.Join(cn, "private_key.pem")] = data
+	m[filepath.Join(cn, "privkey.pem")] = data
 
 	return m, nil
 }
@@ -104,7 +112,7 @@ func (d *replStorage) PutCert(cn string, der [][]byte, key crypto.Signer) error
 	now := time.Now()
 	var req replds.SetNodesRequest
 	for path, data := range filemap {
-		req.Nodes = append(req.Nodes, replds.Node{
+		req.Nodes = append(req.Nodes, &replds.Node{
 			Path:      path,
 			Value:     data,
 			Timestamp: now,
@@ -171,7 +179,7 @@ func encodePrivateKey(key crypto.Signer) ([]byte, error) {
 	switch priv := key.(type) {
 	case *rsa.PrivateKey:
 		pb = &pem.Block{
-			Type:  "PRIVATE KEY",
+			Type:  "RSA PRIVATE KEY",
 			Bytes: x509.MarshalPKCS1PrivateKey(priv),
 		}
 	case *ecdsa.PrivateKey:

util.go

+package acmeserver
+
+import (
+	"context"
+	"sync"
+	"time"
+)
+
+// Updates are long-term jobs, so they should be interruptible. We run
+// updates in a separate goroutine, and cancel them when the
+// configuration is reloaded or on exit. A semaphore ensures that only
+// one update goroutine will be running at any given time (without
+// other ones piling up).
+func runWithUpdates(ctx context.Context, fn func(context.Context, interface{}), reloadCh <-chan interface{}, updateInterval time.Duration) {
+	// Function to cancel the current update, and the associated
+	// WaitGroup to wait for its termination.
+	var upCancel context.CancelFunc
+	var wg sync.WaitGroup
+	sem := make(chan struct{}, 1)
+
+	startUpdate := func(value interface{}) context.CancelFunc {
+		// Acquire the semaphore, return if we fail to.
+		// Equivalent to a 'try-lock' construct.
+		select {
+		case sem <- struct{}{}:
+		default:
+			return nil
+		}
+		defer func() {
+			<-sem
+		}()
+
+		ctx, cancel := context.WithCancel(ctx)
+		wg.Add(1)
+		go func() {
+			fn(ctx, value)
+			wg.Done()
+		}()
+		return cancel
+	}
+
+	// Cancel the running update, if any. Called on config
+	// updates, when exiting.
+	cancelUpdate := func() {
+		if upCancel != nil {
+			upCancel()
+			upCancel = nil
+		}
+		wg.Wait()
+	}
+	defer cancelUpdate()
+
+	var cur interface{}
+	tick := time.NewTicker(updateInterval)
+	defer tick.Stop()
+	for {
+		select {
+		case <-tick.C:
+			// Do not cancel running update when running the ticker.
+			if cancel := startUpdate(cur); cancel != nil {
+				upCancel = cancel
+			}
+		case value := <-reloadCh:
+			// Cancel the running update when configuration is reloaded.
+			cancelUpdate()
+			cur = value
+		case <-ctx.Done():
+			return
+		}
+	}
+}

vendor/git.autistici.org/ai3/go-common/.gitlab-ci.yml

+stages:
+  - test
+
+run_tests:
+  stage: test
+  image: registry.git.autistici.org/ai3/docker/test/golang:master
+  script:
+    - run-go-test ./...
+  artifacts:
+    when: always
+    reports:
+      coverage_report:
+        coverage_format: cobertura
+        path: cover.xml
+      junit: report.xml
+

vendor/git.autistici.org/ai3/go-common/README.md

+ai3/go-common
+===
+
+Common code for ai3 services and tools.
+
+A quick overview of the contents:
+
+* [client](clientutil/) and [server](serverutil/) HTTP-based
+  "RPC" implementation, just JSON POST requests but with retries,
+  backoff, timeouts, tracing, etc.
+
+* [server implementation of a generic line-based protocol over a UNIX
+  socket](unix/).
+
+* a [LDAP connection pool](ldap/).
+
+* utilities to [serialize composite data types](ldap/compositetypes/)
+  used in our LDAP database.
+
+* a [password hashing library](pwhash/) that uses fancy advanced
+  crypto by default but is also backwards compatible with old
+  libc crypto.
+
+* utilities to [manage encryption keys](userenckey/), themselves
+  encrypted with a password and a KDF.