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Merge branch 'master' into fix/596

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This commit is contained in:
Aleksey Dmitrevskiy
2019-03-06 18:25:42 +03:00
parent 1b15bee2b0 7ec4aa91ea
commit bc4c2e2ff7
12 changed files with 459 additions and 319 deletions
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303
control.go
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@@ -3,21 +3,12 @@ package main
import (
"bytes"
"context"
"crypto"
"crypto/ecdsa"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"reflect"
"sort"
"strconv"
"strings"
@@ -26,7 +17,6 @@ import (
"github.com/AdguardTeam/AdGuardHome/dnsforward"
"github.com/AdguardTeam/dnsproxy/upstream"
"github.com/AdguardTeam/golibs/log"
"github.com/joomcode/errorx"
"github.com/miekg/dns"
govalidator "gopkg.in/asaskevich/govalidator.v4"
)
@@ -993,295 +983,6 @@ func handleInstallConfigure(w http.ResponseWriter, r *http.Request) {
}
}
// ---
// TLS
// ---
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 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 = validateCertificates(data)
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 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 = validateCertificates(data)
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
httpsServer.cond.L.Lock()
httpsServer.cond.Broadcast()
if httpsServer.server != nil {
httpsServer.server.Shutdown(context.TODO())
}
httpsServer.cond.L.Unlock()
}()
}
}
func validateCertificates(data tlsConfig) tlsConfig {
var err error
// clear out status for certificates
data.tlsConfigStatus = tlsConfigStatus{}
// check only public certificate separately from the key
if data.CertificateChain != "" {
log.Tracef("got certificate: %s", data.CertificateChain)
// now do a more extended validation
var certs []*pem.Block // PEM-encoded certificates
var skippedBytes []string // skipped bytes
pemblock := []byte(data.CertificateChain)
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 data
}
parsedCerts = append(parsedCerts, parsed)
}
if len(parsedCerts) == 0 {
data.WarningValidation = fmt.Sprintf("You have specified an empty certificate")
return data
}
data.ValidCert = true
// spew.Dump(parsedCerts)
opts := x509.VerifyOptions{
DNSName: data.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
}
}
// validate private key (right now the only validation possible is just parsing it)
if data.PrivateKey != "" {
// 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(data.PrivateKey)
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 data
}
// parse the decoded key
_, keytype, err := parsePrivateKey(key.Bytes)
if err != nil {
data.WarningValidation = fmt.Sprintf("Failed to parse private key: %s", err)
return data
}
data.ValidKey = true
data.KeyType = keytype
}
// if both are set, validate both in unison
if data.PrivateKey != "" && data.CertificateChain != "" {
_, err = tls.X509KeyPair([]byte(data.CertificateChain), []byte(data.PrivateKey))
if err != nil {
data.WarningValidation = fmt.Sprintf("Invalid certificate or key: %s", err)
return data
}
data.usable = 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
}
}
// --------------
// DNS-over-HTTPS
// --------------
@@ -1347,9 +1048,7 @@ func registerControlHandlers() {
http.HandleFunc("/control/dhcp/set_config", postInstall(optionalAuth(ensurePOST(handleDHCPSetConfig))))
http.HandleFunc("/control/dhcp/find_active_dhcp", postInstall(optionalAuth(ensurePOST(handleDHCPFindActiveServer))))
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))))
RegisterTLSHandlers()
http.HandleFunc("/dns-query", postInstall(handleDOH))
}