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// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package cmd
import (
"crypto/x509"
"encoding/pem"
"fmt"
"net/http"
"os"
"strconv"
"strings"
"code.gitea.io/gitea/modules/graceful"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/process"
"code.gitea.io/gitea/modules/setting"
"github.com/caddyserver/certmagic"
)
func getCARoot(path string) (*x509.CertPool, error) {
r, err := os.ReadFile(path)
if err != nil {
return nil, err
}
block, _ := pem.Decode(r)
if block == nil {
return nil, fmt.Errorf("no PEM found in the file %s", path)
}
caRoot, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, err
}
certPool := x509.NewCertPool()
certPool.AddCert(caRoot)
return certPool, nil
}
func runACME(listenAddr string, m http.Handler) error {
// If HTTP Challenge enabled, needs to be serving on port 80. For TLSALPN needs 443.
// Due to docker port mapping this can't be checked programmatically
// TODO: these are placeholders until we add options for each in settings with appropriate warning
enableHTTPChallenge := true
enableTLSALPNChallenge := true
altHTTPPort := 0
altTLSALPNPort := 0
if p, err := strconv.Atoi(setting.PortToRedirect); err == nil {
altHTTPPort = p
}
if p, err := strconv.Atoi(setting.HTTPPort); err == nil {
altTLSALPNPort = p
}
magic := certmagic.NewDefault()
magic.Storage = &certmagic.FileStorage{Path: setting.AcmeLiveDirectory}
// Try to use private CA root if provided, otherwise defaults to system's trust
var certPool *x509.CertPool
if setting.AcmeCARoot != "" {
var err error
certPool, err = getCARoot(setting.AcmeCARoot)
if err != nil {
log.Warn("Failed to parse CA Root certificate, using default CA trust: %v", err)
}
}
myACME := certmagic.NewACMEIssuer(magic, certmagic.ACMEIssuer{
CA: setting.AcmeURL,
TrustedRoots: certPool,
Email: setting.AcmeEmail,
Agreed: setting.AcmeTOS,
DisableHTTPChallenge: !enableHTTPChallenge,
DisableTLSALPNChallenge: !enableTLSALPNChallenge,
ListenHost: setting.HTTPAddr,
AltTLSALPNPort: altTLSALPNPort,
AltHTTPPort: altHTTPPort,
})
magic.Issuers = []certmagic.Issuer{myACME}
// this obtains certificates or renews them if necessary
err := magic.ManageSync(graceful.GetManager().HammerContext(), []string{setting.Domain})
if err != nil {
return err
}
tlsConfig := magic.TLSConfig()
tlsConfig.NextProtos = append(tlsConfig.NextProtos, "h2")
if version := toTLSVersion(setting.SSLMinimumVersion); version != 0 {
tlsConfig.MinVersion = version
}
if version := toTLSVersion(setting.SSLMaximumVersion); version != 0 {
tlsConfig.MaxVersion = version
}
// Set curve preferences
if curves := toCurvePreferences(setting.SSLCurvePreferences); len(curves) > 0 {
tlsConfig.CurvePreferences = curves
}
// Set cipher suites
if ciphers := toTLSCiphers(setting.SSLCipherSuites); len(ciphers) > 0 {
tlsConfig.CipherSuites = ciphers
}
if enableHTTPChallenge {
go func() {
_, _, finished := process.GetManager().AddTypedContext(graceful.GetManager().HammerContext(), "Web: ACME HTTP challenge server", process.SystemProcessType, true)
defer finished()
log.Info("Running Let's Encrypt handler on %s", setting.HTTPAddr+":"+setting.PortToRedirect)
// all traffic coming into HTTP will be redirect to HTTPS automatically (LE HTTP-01 validation happens here)
err := runHTTP("tcp", setting.HTTPAddr+":"+setting.PortToRedirect, "Let's Encrypt HTTP Challenge", myACME.HTTPChallengeHandler(http.HandlerFunc(runLetsEncryptFallbackHandler)))
if err != nil {
log.Fatal("Failed to start the Let's Encrypt handler on port %s: %v", setting.PortToRedirect, err)
}
}()
}
return runHTTPSWithTLSConfig("tcp", listenAddr, "Web", tlsConfig, m)
}
func runLetsEncryptFallbackHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" && r.Method != "HEAD" {
http.Error(w, "Use HTTPS", http.StatusBadRequest)
return
}
// Remove the trailing slash at the end of setting.AppURL, the request
// URI always contains a leading slash, which would result in a double
// slash
target := strings.TrimSuffix(setting.AppURL, "/") + r.URL.RequestURI()
http.Redirect(w, r, target, http.StatusTemporaryRedirect)
}
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