mirror of
https://github.com/AdguardTeam/AdGuardHome.git
synced 2024-11-17 19:08:25 -07:00
339 lines
9.4 KiB
Go
339 lines
9.4 KiB
Go
// Control: TLS configuring handlers
|
|
|
|
package home
|
|
|
|
import (
|
|
"context"
|
|
"crypto"
|
|
"crypto/ecdsa"
|
|
"crypto/rsa"
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"encoding/base64"
|
|
"encoding/json"
|
|
"encoding/pem"
|
|
"errors"
|
|
"fmt"
|
|
"net/http"
|
|
"reflect"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/AdguardTeam/golibs/log"
|
|
"github.com/joomcode/errorx"
|
|
)
|
|
|
|
// RegisterTLSHandlers registers HTTP handlers for TLS configuration
|
|
func RegisterTLSHandlers() {
|
|
http.HandleFunc("/control/tls/status", postInstall(optionalAuth(ensureGET(handleTLSStatus))))
|
|
http.HandleFunc("/control/tls/configure", postInstall(optionalAuth(ensurePOST(handleTLSConfigure))))
|
|
http.HandleFunc("/control/tls/validate", postInstall(optionalAuth(ensurePOST(handleTLSValidate))))
|
|
}
|
|
|
|
func handleTLSStatus(w http.ResponseWriter, r *http.Request) {
|
|
log.Tracef("%s %v", r.Method, r.URL)
|
|
marshalTLS(w, config.TLS)
|
|
}
|
|
|
|
func handleTLSValidate(w http.ResponseWriter, r *http.Request) {
|
|
log.Tracef("%s %v", r.Method, r.URL)
|
|
data, err := unmarshalTLS(r)
|
|
if err != nil {
|
|
httpError(w, http.StatusBadRequest, "Failed to unmarshal TLS config: %s", err)
|
|
return
|
|
}
|
|
|
|
// check if port is available
|
|
// BUT: if we are already using this port, no need
|
|
alreadyRunning := false
|
|
if config.httpsServer.server != nil {
|
|
alreadyRunning = true
|
|
}
|
|
if !alreadyRunning {
|
|
err = checkPortAvailable(config.BindHost, data.PortHTTPS)
|
|
if err != nil {
|
|
httpError(w, http.StatusBadRequest, "port %d is not available, cannot enable HTTPS on it", data.PortHTTPS)
|
|
return
|
|
}
|
|
}
|
|
|
|
data.tlsConfigStatus = validateCertificates(data.CertificateChain, data.PrivateKey, data.ServerName)
|
|
marshalTLS(w, data)
|
|
}
|
|
|
|
func handleTLSConfigure(w http.ResponseWriter, r *http.Request) {
|
|
log.Tracef("%s %v", r.Method, r.URL)
|
|
data, err := unmarshalTLS(r)
|
|
if err != nil {
|
|
httpError(w, http.StatusBadRequest, "Failed to unmarshal TLS config: %s", err)
|
|
return
|
|
}
|
|
|
|
// check if port is available
|
|
// BUT: if we are already using this port, no need
|
|
alreadyRunning := false
|
|
if config.httpsServer.server != nil {
|
|
alreadyRunning = true
|
|
}
|
|
if !alreadyRunning {
|
|
err = checkPortAvailable(config.BindHost, data.PortHTTPS)
|
|
if err != nil {
|
|
httpError(w, http.StatusBadRequest, "port %d is not available, cannot enable HTTPS on it", data.PortHTTPS)
|
|
return
|
|
}
|
|
}
|
|
|
|
restartHTTPS := false
|
|
data.tlsConfigStatus = validateCertificates(data.CertificateChain, data.PrivateKey, data.ServerName)
|
|
if !reflect.DeepEqual(config.TLS.tlsConfigSettings, data.tlsConfigSettings) {
|
|
log.Printf("tls config settings have changed, will restart HTTPS server")
|
|
restartHTTPS = true
|
|
}
|
|
config.TLS = data
|
|
err = writeAllConfigsAndReloadDNS()
|
|
if err != nil {
|
|
httpError(w, http.StatusInternalServerError, "Couldn't write config file: %s", err)
|
|
return
|
|
}
|
|
marshalTLS(w, data)
|
|
// this needs to be done in a goroutine because Shutdown() is a blocking call, and it will block
|
|
// until all requests are finished, and _we_ are inside a request right now, so it will block indefinitely
|
|
if restartHTTPS {
|
|
go func() {
|
|
time.Sleep(time.Second) // TODO: could not find a way to reliably know that data was fully sent to client by https server, so we wait a bit to let response through before closing the server
|
|
config.httpsServer.cond.L.Lock()
|
|
config.httpsServer.cond.Broadcast()
|
|
if config.httpsServer.server != nil {
|
|
config.httpsServer.server.Shutdown(context.TODO())
|
|
}
|
|
config.httpsServer.cond.L.Unlock()
|
|
}()
|
|
}
|
|
}
|
|
|
|
func verifyCertChain(data *tlsConfigStatus, certChain string, serverName string) error {
|
|
log.Tracef("got certificate: %s", certChain)
|
|
|
|
// now do a more extended validation
|
|
var certs []*pem.Block // PEM-encoded certificates
|
|
var skippedBytes []string // skipped bytes
|
|
|
|
pemblock := []byte(certChain)
|
|
for {
|
|
var decoded *pem.Block
|
|
decoded, pemblock = pem.Decode(pemblock)
|
|
if decoded == nil {
|
|
break
|
|
}
|
|
if decoded.Type == "CERTIFICATE" {
|
|
certs = append(certs, decoded)
|
|
} else {
|
|
skippedBytes = append(skippedBytes, decoded.Type)
|
|
}
|
|
}
|
|
|
|
var parsedCerts []*x509.Certificate
|
|
|
|
for _, cert := range certs {
|
|
parsed, err := x509.ParseCertificate(cert.Bytes)
|
|
if err != nil {
|
|
data.WarningValidation = fmt.Sprintf("Failed to parse certificate: %s", err)
|
|
return errors.New(data.WarningValidation)
|
|
}
|
|
parsedCerts = append(parsedCerts, parsed)
|
|
}
|
|
|
|
if len(parsedCerts) == 0 {
|
|
data.WarningValidation = fmt.Sprintf("You have specified an empty certificate")
|
|
return errors.New(data.WarningValidation)
|
|
}
|
|
|
|
data.ValidCert = true
|
|
|
|
// spew.Dump(parsedCerts)
|
|
|
|
opts := x509.VerifyOptions{
|
|
DNSName: serverName,
|
|
}
|
|
|
|
log.Printf("number of certs - %d", len(parsedCerts))
|
|
if len(parsedCerts) > 1 {
|
|
// set up an intermediate
|
|
pool := x509.NewCertPool()
|
|
for _, cert := range parsedCerts[1:] {
|
|
log.Printf("got an intermediate cert")
|
|
pool.AddCert(cert)
|
|
}
|
|
opts.Intermediates = pool
|
|
}
|
|
|
|
// TODO: save it as a warning rather than error it out -- shouldn't be a big problem
|
|
mainCert := parsedCerts[0]
|
|
_, err := mainCert.Verify(opts)
|
|
if err != nil {
|
|
// let self-signed certs through
|
|
data.WarningValidation = fmt.Sprintf("Your certificate does not verify: %s", err)
|
|
} else {
|
|
data.ValidChain = true
|
|
}
|
|
// spew.Dump(chains)
|
|
|
|
// update status
|
|
if mainCert != nil {
|
|
notAfter := mainCert.NotAfter
|
|
data.Subject = mainCert.Subject.String()
|
|
data.Issuer = mainCert.Issuer.String()
|
|
data.NotAfter = notAfter
|
|
data.NotBefore = mainCert.NotBefore
|
|
data.DNSNames = mainCert.DNSNames
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func validatePkey(data *tlsConfigStatus, pkey string) error {
|
|
// now do a more extended validation
|
|
var key *pem.Block // PEM-encoded certificates
|
|
var skippedBytes []string // skipped bytes
|
|
|
|
// go through all pem blocks, but take first valid pem block and drop the rest
|
|
pemblock := []byte(pkey)
|
|
for {
|
|
var decoded *pem.Block
|
|
decoded, pemblock = pem.Decode(pemblock)
|
|
if decoded == nil {
|
|
break
|
|
}
|
|
if decoded.Type == "PRIVATE KEY" || strings.HasSuffix(decoded.Type, " PRIVATE KEY") {
|
|
key = decoded
|
|
break
|
|
} else {
|
|
skippedBytes = append(skippedBytes, decoded.Type)
|
|
}
|
|
}
|
|
|
|
if key == nil {
|
|
data.WarningValidation = "No valid keys were found"
|
|
return errors.New(data.WarningValidation)
|
|
}
|
|
|
|
// parse the decoded key
|
|
_, keytype, err := parsePrivateKey(key.Bytes)
|
|
if err != nil {
|
|
data.WarningValidation = fmt.Sprintf("Failed to parse private key: %s", err)
|
|
return errors.New(data.WarningValidation)
|
|
}
|
|
|
|
data.ValidKey = true
|
|
data.KeyType = keytype
|
|
return nil
|
|
}
|
|
|
|
// Process certificate data and its private key.
|
|
// All parameters are optional.
|
|
// On error, return partially set object
|
|
// with 'WarningValidation' field containing error description.
|
|
func validateCertificates(certChain, pkey, serverName string) tlsConfigStatus {
|
|
var data tlsConfigStatus
|
|
|
|
// check only public certificate separately from the key
|
|
if certChain != "" {
|
|
if verifyCertChain(&data, certChain, serverName) != nil {
|
|
return data
|
|
}
|
|
}
|
|
|
|
// validate private key (right now the only validation possible is just parsing it)
|
|
if pkey != "" {
|
|
if validatePkey(&data, pkey) != nil {
|
|
return data
|
|
}
|
|
}
|
|
|
|
// if both are set, validate both in unison
|
|
if pkey != "" && certChain != "" {
|
|
_, err := tls.X509KeyPair([]byte(certChain), []byte(pkey))
|
|
if err != nil {
|
|
data.WarningValidation = fmt.Sprintf("Invalid certificate or key: %s", err)
|
|
return data
|
|
}
|
|
data.ValidPair = true
|
|
}
|
|
|
|
return data
|
|
}
|
|
|
|
// Attempt to parse the given private key DER block. OpenSSL 0.9.8 generates
|
|
// PKCS#1 private keys by default, while OpenSSL 1.0.0 generates PKCS#8 keys.
|
|
// OpenSSL ecparam generates SEC1 EC private keys for ECDSA. We try all three.
|
|
func parsePrivateKey(der []byte) (crypto.PrivateKey, string, error) {
|
|
if key, err := x509.ParsePKCS1PrivateKey(der); err == nil {
|
|
return key, "RSA", nil
|
|
}
|
|
|
|
if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
|
|
switch key := key.(type) {
|
|
case *rsa.PrivateKey:
|
|
return key, "RSA", nil
|
|
case *ecdsa.PrivateKey:
|
|
return key, "ECDSA", nil
|
|
default:
|
|
return nil, "", errors.New("tls: found unknown private key type in PKCS#8 wrapping")
|
|
}
|
|
}
|
|
|
|
if key, err := x509.ParseECPrivateKey(der); err == nil {
|
|
return key, "ECDSA", nil
|
|
}
|
|
|
|
return nil, "", errors.New("tls: failed to parse private key")
|
|
}
|
|
|
|
// unmarshalTLS handles base64-encoded certificates transparently
|
|
func unmarshalTLS(r *http.Request) (tlsConfig, error) {
|
|
data := tlsConfig{}
|
|
err := json.NewDecoder(r.Body).Decode(&data)
|
|
if err != nil {
|
|
return data, errorx.Decorate(err, "Failed to parse new TLS config json")
|
|
}
|
|
|
|
if data.CertificateChain != "" {
|
|
certPEM, err := base64.StdEncoding.DecodeString(data.CertificateChain)
|
|
if err != nil {
|
|
return data, errorx.Decorate(err, "Failed to base64-decode certificate chain")
|
|
}
|
|
data.CertificateChain = string(certPEM)
|
|
}
|
|
|
|
if data.PrivateKey != "" {
|
|
keyPEM, err := base64.StdEncoding.DecodeString(data.PrivateKey)
|
|
if err != nil {
|
|
return data, errorx.Decorate(err, "Failed to base64-decode private key")
|
|
}
|
|
|
|
data.PrivateKey = string(keyPEM)
|
|
}
|
|
|
|
return data, nil
|
|
}
|
|
|
|
func marshalTLS(w http.ResponseWriter, data tlsConfig) {
|
|
w.Header().Set("Content-Type", "application/json")
|
|
|
|
if data.CertificateChain != "" {
|
|
encoded := base64.StdEncoding.EncodeToString([]byte(data.CertificateChain))
|
|
data.CertificateChain = encoded
|
|
}
|
|
|
|
if data.PrivateKey != "" {
|
|
encoded := base64.StdEncoding.EncodeToString([]byte(data.PrivateKey))
|
|
data.PrivateKey = encoded
|
|
}
|
|
|
|
err := json.NewEncoder(w).Encode(data)
|
|
if err != nil {
|
|
httpError(w, http.StatusInternalServerError, "Failed to marshal json with TLS status: %s", err)
|
|
return
|
|
}
|
|
}
|