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package server
import (
"context"
"crypto/x509"
"net"
"net/http"
"slices"
"strconv"
"go.alanpearce.eu/x/listenfd"
"github.com/alanpearce/certmagic"
certmagic_redis "github.com/alanpearce/certmagic-storage-redis"
"github.com/ardanlabs/conf/v3"
"github.com/libdns/powerdns"
"gitlab.com/tozd/go/errors"
)
type redisConfig struct {
Address string `conf:"required"`
Username string `conf:"default:default"`
Password string `conf:"required"`
EncryptionKey string `conf:"required"`
KeyPrefix string `conf:"default:certmagic"`
TLSEnabled bool `conf:"default:false,env:TLS_ENABLED"`
TLSInsecure bool `conf:"default:false,env:TLS_INSECURE"`
}
func (s *Server) serveTLS() (err error) {
log := s.log.Named("tls")
wildcardDomain := "*." + s.config.WildcardDomain
certificateDomains := slices.Clone(s.config.Domains)
cfg := certmagic.NewDefault()
cfg.Logger = log.GetLogger().Named("certmagic")
acme := certmagic.DefaultACME
acme.Agreed = true
acme.Email = s.config.Email
acme.ListenHost = s.runtimeConfig.ListenAddress
acme.AltHTTPPort = s.runtimeConfig.Port
acme.AltTLSALPNPort = s.runtimeConfig.TLSPort
if s.runtimeConfig.Development {
ca := s.runtimeConfig.ACMECA
if ca == "" {
return errors.New("can't enable tls in development without an ACME_CA")
}
cp, err := x509.SystemCertPool()
if err != nil {
log.Warn("could not get system certificate pool", "error", err)
cp = x509.NewCertPool()
}
if cacert := s.runtimeConfig.ACMECACert; cacert != "" {
cp.AppendCertsFromPEM([]byte(cacert))
}
// caddy's ACME server (step-ca) doesn't specify an OCSP server
cfg.OCSP.DisableStapling = true
acme.CA = s.runtimeConfig.ACMECA
acme.TrustedRoots = cp
acme.DisableTLSALPNChallenge = true
} else {
rc := &redisConfig{}
_, err = conf.Parse("REDIS", rc)
if err != nil {
return errors.WithMessage(err, "could not parse redis config")
}
pdns := &powerdns.Provider{}
_, err = conf.Parse("POWERDNS", pdns)
if err != nil {
return errors.WithMessage(err, "could not parse PowerDNS ACME config")
}
acme.DNS01Solver = &certmagic.DNS01Solver{
DNSManager: certmagic.DNSManager{
DNSProvider: pdns,
Logger: cfg.Logger,
},
}
certificateDomains = append(slices.Clone(s.config.Domains), wildcardDomain)
rs := certmagic_redis.New()
rs.Address = []string{rc.Address}
rs.Username = rc.Username
rs.Password = rc.Password
rs.EncryptionKey = rc.EncryptionKey
rs.KeyPrefix = rc.KeyPrefix
rs.TlsEnabled = rc.TLSEnabled
rs.TlsInsecure = rc.TLSInsecure
cfg.Storage = rs
err = rs.ProvisionCertMagic(context.TODO(), log.GetLogger())
if err != nil {
return errors.WithMessage(err, "could not provision redis storage")
}
}
ln, err := listenfd.GetListener(
1,
net.JoinHostPort(s.runtimeConfig.ListenAddress, strconv.Itoa(s.runtimeConfig.Port)),
log.Named("listenfd"),
)
if err != nil {
return errors.WithMessage(err, "could not bind plain socket")
}
go func(ln net.Listener, srv *http.Server) {
httpMux := http.NewServeMux()
httpMux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if certmagic.LooksLikeHTTPChallenge(r) &&
acme.HandleHTTPChallenge(w, r) {
return
}
url := r.URL
url.Scheme = "https"
port := s.config.BaseURL.Port()
if port == "" {
url.Host = r.Host
} else {
host, _, err := net.SplitHostPort(r.Host)
if err != nil {
log.Warn("error splitting host and port", "error", err)
host = r.Host
}
url.Host = net.JoinHostPort(host, s.config.BaseURL.Port())
}
if slices.Contains(s.config.Domains, r.Host) {
http.Redirect(w, r, url.String(), http.StatusMovedPermanently)
} else {
http.NotFound(w, r)
}
})
srv.Handler = httpMux
if err := srv.Serve(ln); err != nil && !errors.Is(err, http.ErrServerClosed) {
log.Error("error in http handler", "error", err)
}
}(ln, &http.Server{
ReadHeaderTimeout: s.ReadHeaderTimeout,
ReadTimeout: s.ReadTimeout,
WriteTimeout: s.WriteTimeout,
IdleTimeout: s.IdleTimeout,
})
log.Debug(
"starting certmagic",
"http_port",
s.runtimeConfig.Port,
"https_port",
s.runtimeConfig.TLSPort,
)
err = cfg.ManageAsync(context.TODO(), certificateDomains)
if err != nil {
return errors.WithMessage(err, "could not enable TLS")
}
tlsConfig := cfg.TLSConfig()
tlsConfig.NextProtos = append([]string{"h2", "http/1.1"}, tlsConfig.NextProtos...)
sln, err := listenfd.GetListenerTLS(
0,
net.JoinHostPort(s.runtimeConfig.ListenAddress, strconv.Itoa(s.runtimeConfig.TLSPort)),
tlsConfig,
log.Named("listenfd"),
)
if err != nil {
return errors.WithMessage(err, "could not bind tls socket")
}
return s.Serve(sln)
}
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