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Pull request: 4925-refactor-tls-vol-2 

Updates #4925.

Squashed commit of the following:

commit 4b221936ea6c2a244c404e95fa2a033571e07168
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Oct 14 19:03:42 2022 +0300

    all: refactor tls
This commit is contained in:
Ainar Garipov 2022-10-14 19:37:14 +03:00
parent a1acfbbae4
commit fee81b31ec
5 changed files with 399 additions and 319 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
internal/home/controlinstall.go
View File

@ -424,7 +424,7 @@ func (web *Web) handleInstallConfigure(w http.ResponseWriter, r *http.Request) {
// moment we'll allow setting up TLS in the initial configuration or the
// configuration itself will use HTTPS protocol, because the underlying
// functions potentially restart the HTTPS server.
err = StartMods()
err = startMods()
if err != nil {
Context.firstRun = true
copyInstallSettings(config, curConfig)

24
internal/home/home.go
View File

@ -59,7 +59,7 @@ type homeContext struct {
auth *Auth // HTTP authentication module
filters *filtering.DNSFilter // DNS filtering module
web *Web // Web (HTTP, HTTPS) module
tls *TLSMod // TLS module
tls *tlsManager // TLS module
// etcHosts is an IP-hostname pairs set taken from system configuration
// (e.g. /etc/hosts) files.
etcHosts *aghnet.HostsContainer
@ -117,7 +117,7 @@ func Main(clientBuildFS fs.FS) {
switch sig {
case syscall.SIGHUP:
Context.clients.Reload()
Context.tls.Reload()
Context.tls.reload()
default:
cleanup(context.Background())
@ -495,9 +495,9 @@ func run(opts options, clientBuildFS fs.FS) {
}
config.Users = nil
Context.tls = tlsCreate(config.TLS)
if Context.tls == nil {
log.Fatalf("Can't initialize TLS module")
Context.tls, err = newTLSManager(config.TLS)
if err != nil {
log.Fatalf("initializing tls: %s", err)
}
Context.web, err = initWeb(opts, clientBuildFS)
@ -507,7 +507,7 @@ func run(opts options, clientBuildFS fs.FS) {
err = initDNSServer()
fatalOnError(err)
Context.tls.Start()
Context.tls.start()
go func() {
serr := startDNSServer()
@ -531,20 +531,22 @@ func run(opts options, clientBuildFS fs.FS) {
select {}
}
// StartMods initializes and starts the DNS server after installation.
func StartMods() error {
// startMods initializes and starts the DNS server after installation.
func startMods() error {
err := initDNSServer()
if err != nil {
return err
}
Context.tls.Start()
Context.tls.start()
err = startDNSServer()
if err != nil {
closeDNSServer()
return err
}
return nil
}
@ -728,7 +730,6 @@ func cleanup(ctx context.Context) {
}
if Context.tls != nil {
Context.tls.Close()
Context.tls = nil
}
}
@ -738,7 +739,8 @@ func cleanupAlways() {
if len(Context.pidFileName) != 0 {
_ = os.Remove(Context.pidFileName)
}
log.Info("Stopped")
log.Info("stopped")
}
func exitWithError() {

6
internal/home/mobileconfig_test.go
View File

@ -32,7 +32,7 @@ func setupDNSIPs(t testing.TB) {
},
}
Context.tls = &TLSMod{}
Context.tls = &tlsManager{}
}
func TestHandleMobileConfigDoH(t *testing.T) {
@ -65,7 +65,7 @@ func TestHandleMobileConfigDoH(t *testing.T) {
oldTLSConf := Context.tls
t.Cleanup(func() { Context.tls = oldTLSConf })
Context.tls = &TLSMod{conf: tlsConfigSettings{}}
Context.tls = &tlsManager{conf: tlsConfigSettings{}}
r, err := http.NewRequest(http.MethodGet, "https://example.com:12345/apple/doh.mobileconfig", nil)
require.NoError(t, err)
@ -137,7 +137,7 @@ func TestHandleMobileConfigDoT(t *testing.T) {
oldTLSConf := Context.tls
t.Cleanup(func() { Context.tls = oldTLSConf })
Context.tls = &TLSMod{conf: tlsConfigSettings{}}
Context.tls = &tlsManager{conf: tlsConfigSettings{}}
r, err := http.NewRequest(http.MethodGet, "https://example.com:12345/apple/dot.mobileconfig", nil)
require.NoError(t, err)

615
internal/home/tls.go
View File

@ -26,216 +26,256 @@ import (
"github.com/google/go-cmp/cmp"
)
var tlsWebHandlersRegistered = false
// tlsManager contains the current configuration and state of AdGuard Home TLS
// encryption.
type tlsManager struct {
// status is the current status of the configuration. It is never nil.
status *tlsConfigStatus
// certLastMod is the last modification time of the certificate file.
certLastMod time.Time
// TLSMod - TLS module object
type TLSMod struct {
certLastMod time.Time // last modification time of the certificate file
status tlsConfigStatus
confLock sync.Mutex
conf tlsConfigSettings
}
// Create TLS module
func tlsCreate(conf tlsConfigSettings) *TLSMod {
t := &TLSMod{}
t.conf = conf
if t.conf.Enabled {
if !t.load() {
// Something is not valid - return an empty TLS config
return &TLSMod{conf: tlsConfigSettings{
Enabled: conf.Enabled,
ServerName: conf.ServerName,
PortHTTPS: conf.PortHTTPS,
PortDNSOverTLS: conf.PortDNSOverTLS,
PortDNSOverQUIC: conf.PortDNSOverQUIC,
AllowUnencryptedDoH: conf.AllowUnencryptedDoH,
}}
// newTLSManager initializes the TLS configuration.
func newTLSManager(conf tlsConfigSettings) (m *tlsManager, err error) {
m = &tlsManager{
status: &tlsConfigStatus{},
conf: conf,
}
t.setCertFileTime()
if m.conf.Enabled {
err = m.load()
if err != nil {
return nil, err
}
return t
m.setCertFileTime()
}
return m, nil
}
func (t *TLSMod) load() bool {
if !tlsLoadConfig(&t.conf, &t.status) {
log.Error("failed to load TLS config: %s", t.status.WarningValidation)
return false
// load reloads the TLS configuration from files or data from the config file.
func (m *tlsManager) load() (err error) {
err = loadTLSConf(&m.conf, m.status)
if err != nil {
return fmt.Errorf("loading config: %w", err)
}
// validate current TLS config and update warnings (it could have been loaded from file)
data := validateCertificates(string(t.conf.CertificateChainData), string(t.conf.PrivateKeyData), t.conf.ServerName)
if !data.ValidPair {
log.Error("failed to validate certificate: %s", data.WarningValidation)
return false
}
t.status = data
return true
}
// Close - close module
func (t *TLSMod) Close() {
return nil
}
// WriteDiskConfig - write config
func (t *TLSMod) WriteDiskConfig(conf *tlsConfigSettings) {
t.confLock.Lock()
*conf = t.conf
t.confLock.Unlock()
func (m *tlsManager) WriteDiskConfig(conf *tlsConfigSettings) {
m.confLock.Lock()
*conf = m.conf
m.confLock.Unlock()
}
func (t *TLSMod) setCertFileTime() {
if len(t.conf.CertificatePath) == 0 {
// setCertFileTime sets t.certLastMod from the certificate. If there are
// errors, setCertFileTime logs them.
func (m *tlsManager) setCertFileTime() {
if len(m.conf.CertificatePath) == 0 {
return
}
fi, err := os.Stat(t.conf.CertificatePath)
fi, err := os.Stat(m.conf.CertificatePath)
if err != nil {
log.Error("TLS: %s", err)
log.Error("tls: looking up certificate path: %s", err)
return
}
t.certLastMod = fi.ModTime().UTC()
m.certLastMod = fi.ModTime().UTC()
}
// Start updates the configuration of TLSMod and starts it.
func (t *TLSMod) Start() {
if !tlsWebHandlersRegistered {
tlsWebHandlersRegistered = true
t.registerWebHandlers()
}
// start updates the configuration of t and starts it.
func (m *tlsManager) start() {
m.registerWebHandlers()
t.confLock.Lock()
tlsConf := t.conf
t.confLock.Unlock()
m.confLock.Lock()
tlsConf := m.conf
m.confLock.Unlock()
// The background context is used because the TLSConfigChanged wraps
// context with timeout on its own and shuts down the server, which
// handles current request.
// The background context is used because the TLSConfigChanged wraps context
// with timeout on its own and shuts down the server, which handles current
// request.
Context.web.TLSConfigChanged(context.Background(), tlsConf)
}
// Reload updates the configuration of TLSMod and restarts it.
func (t *TLSMod) Reload() {
t.confLock.Lock()
tlsConf := t.conf
t.confLock.Unlock()
// reload updates the configuration and restarts t.
func (m *tlsManager) reload() {
m.confLock.Lock()
tlsConf := m.conf
m.confLock.Unlock()
if !tlsConf.Enabled || len(tlsConf.CertificatePath) == 0 {
return
}
fi, err := os.Stat(tlsConf.CertificatePath)
if err != nil {
log.Error("TLS: %s", err)
return
}
if fi.ModTime().UTC().Equal(t.certLastMod) {
log.Debug("TLS: certificate file isn't modified")
return
}
log.Debug("TLS: certificate file is modified")
log.Error("tls: %s", err)
t.confLock.Lock()
r := t.load()
t.confLock.Unlock()
if !r {
return
}
t.certLastMod = fi.ModTime().UTC()
if fi.ModTime().UTC().Equal(m.certLastMod) {
log.Debug("tls: certificate file isn't modified")
return
}
log.Debug("tls: certificate file is modified")
m.confLock.Lock()
err = m.load()
m.confLock.Unlock()
if err != nil {
log.Error("tls: reloading: %s", err)
return
}
m.certLastMod = fi.ModTime().UTC()
_ = reconfigureDNSServer()
t.confLock.Lock()
tlsConf = t.conf
t.confLock.Unlock()
// The background context is used because the TLSConfigChanged wraps
// context with timeout on its own and shuts down the server, which
// handles current request.
m.confLock.Lock()
tlsConf = m.conf
m.confLock.Unlock()
// The background context is used because the TLSConfigChanged wraps context
// with timeout on its own and shuts down the server, which handles current
// request.
Context.web.TLSConfigChanged(context.Background(), tlsConf)
}
// Set certificate and private key data
func tlsLoadConfig(tls *tlsConfigSettings, status *tlsConfigStatus) bool {
tls.CertificateChainData = []byte(tls.CertificateChain)
tls.PrivateKeyData = []byte(tls.PrivateKey)
var err error
if tls.CertificatePath != "" {
if tls.CertificateChain != "" {
status.WarningValidation = "certificate data and file can't be set together"
return false
}
tls.CertificateChainData, err = os.ReadFile(tls.CertificatePath)
// loadTLSConf loads and validates the TLS configuration. The returned error is
// also set in status.WarningValidation.
func loadTLSConf(tlsConf *tlsConfigSettings, status *tlsConfigStatus) (err error) {
defer func() {
if err != nil {
status.WarningValidation = err.Error()
return false
}
}()
tlsConf.CertificateChainData = []byte(tlsConf.CertificateChain)
tlsConf.PrivateKeyData = []byte(tlsConf.PrivateKey)
if tlsConf.CertificatePath != "" {
if tlsConf.CertificateChain != "" {
return errors.Error("certificate data and file can't be set together")
}
tlsConf.CertificateChainData, err = os.ReadFile(tlsConf.CertificatePath)
if err != nil {
return fmt.Errorf("reading cert file: %w", err)
}
status.ValidCert = true
}
if tls.PrivateKeyPath != "" {
if tls.PrivateKey != "" {
status.WarningValidation = "private key data and file can't be set together"
return false
if tlsConf.PrivateKeyPath != "" {
if tlsConf.PrivateKey != "" {
return errors.Error("private key data and file can't be set together")
}
tls.PrivateKeyData, err = os.ReadFile(tls.PrivateKeyPath)
tlsConf.PrivateKeyData, err = os.ReadFile(tlsConf.PrivateKeyPath)
if err != nil {
status.WarningValidation = err.Error()
return false
return fmt.Errorf("reading key file: %w", err)
}
status.ValidKey = true
}
return true
err = validateCertificates(
status,
tlsConf.CertificateChainData,
tlsConf.PrivateKeyData,
tlsConf.ServerName,
)
if err != nil {
return fmt.Errorf("validating certificate pair: %w", err)
}
return nil
}
// tlsConfigStatus contains the status of a certificate chain and key pair.
type tlsConfigStatus struct {
ValidCert bool `json:"valid_cert"` // ValidCert is true if the specified certificates chain is a valid chain of X509 certificates
ValidChain bool `json:"valid_chain"` // ValidChain is true if the specified certificates chain is verified and issued by a known CA
Subject string `json:"subject,omitempty"` // Subject is the subject of the first certificate in the chain
Issuer string `json:"issuer,omitempty"` // Issuer is the issuer of the first certificate in the chain
NotBefore time.Time `json:"not_before,omitempty"` // NotBefore is the NotBefore field of the first certificate in the chain
NotAfter time.Time `json:"not_after,omitempty"` // NotAfter is the NotAfter field of the first certificate in the chain
DNSNames []string `json:"dns_names"` // DNSNames is the value of SubjectAltNames field of the first certificate in the chain
// Subject is the subject of the first certificate in the chain.
Subject string `json:"subject,omitempty"`
// key status
ValidKey bool `json:"valid_key"` // ValidKey is true if the key is a valid private key
KeyType string `json:"key_type,omitempty"` // KeyType is one of RSA or ECDSA
// Issuer is the issuer of the first certificate in the chain.
Issuer string `json:"issuer,omitempty"`
// is usable? set by validator
ValidPair bool `json:"valid_pair"` // ValidPair is true if both certificate and private key are correct
// KeyType is the type of the private key.
KeyType string `json:"key_type,omitempty"`
// warnings
WarningValidation string `json:"warning_validation,omitempty"` // WarningValidation is a validation warning message with the issue description
// NotBefore is the NotBefore field of the first certificate in the chain.
NotBefore time.Time `json:"not_before,omitempty"`
// NotAfter is the NotAfter field of the first certificate in the chain.
NotAfter time.Time `json:"not_after,omitempty"`
// WarningValidation is a validation warning message with the issue
// description.
WarningValidation string `json:"warning_validation,omitempty"`
// DNSNames is the value of SubjectAltNames field of the first certificate
// in the chain.
DNSNames []string `json:"dns_names"`
// ValidCert is true if the specified certificate chain is a valid chain of
// X509 certificates.
ValidCert bool `json:"valid_cert"`
// ValidChain is true if the specified certificate chain is verified and
// issued by a known CA.
ValidChain bool `json:"valid_chain"`
// ValidKey is true if the key is a valid private key.
ValidKey bool `json:"valid_key"`
// ValidPair is true if both certificate and private key are correct for
// each other.
ValidPair bool `json:"valid_pair"`
}
// field ordering is important -- yaml fields will mirror ordering from here
// tlsConfig is the TLS configuration and status response.
type tlsConfig struct {
tlsConfigStatus `json:",inline"`
*tlsConfigStatus `json:",inline"`
tlsConfigSettingsExt `json:",inline"`
}
// tlsConfigSettingsExt is used to (un)marshal PrivateKeySaved to ensure that
// clients don't send and receive previously saved private keys.
// tlsConfigSettingsExt is used to (un)marshal the PrivateKeySaved field to
// ensure that clients don't send and receive previously saved private keys.
type tlsConfigSettingsExt struct {
tlsConfigSettings `json:",inline"`
// If private key saved as a string, we set this flag to true
// and omit key from answer.
// PrivateKeySaved is true if the private key is saved as a string and omit
// key from answer.
PrivateKeySaved bool `yaml:"-" json:"private_key_saved,inline"`
}
func (t *TLSMod) handleTLSStatus(w http.ResponseWriter, r *http.Request) {
t.confLock.Lock()
func (m *tlsManager) handleTLSStatus(w http.ResponseWriter, r *http.Request) {
m.confLock.Lock()
data := tlsConfig{
tlsConfigSettingsExt: tlsConfigSettingsExt{
tlsConfigSettings: t.conf,
tlsConfigSettings: m.conf,
},
tlsConfigStatus: t.status,
tlsConfigStatus: m.status,
}
t.confLock.Unlock()
m.confLock.Unlock()
marshalTLS(w, r, data)
}
func (t *TLSMod) handleTLSValidate(w http.ResponseWriter, r *http.Request) {
func (m *tlsManager) handleTLSValidate(w http.ResponseWriter, r *http.Request) {
setts, err := unmarshalTLS(r)
if err != nil {
aghhttp.Error(r, w, http.StatusBadRequest, "Failed to unmarshal TLS config: %s", err)
@ -244,7 +284,7 @@ func (t *TLSMod) handleTLSValidate(w http.ResponseWriter, r *http.Request) {
}
if setts.PrivateKeySaved {
setts.PrivateKey = t.conf.PrivateKey
setts.PrivateKey = m.conf.PrivateKey
}
if setts.Enabled {
@ -276,75 +316,74 @@ func (t *TLSMod) handleTLSValidate(w http.ResponseWriter, r *http.Request) {
return
}
status := tlsConfigStatus{}
if tlsLoadConfig(&setts.tlsConfigSettings, &status) {
status = validateCertificates(string(setts.CertificateChainData), string(setts.PrivateKeyData), setts.ServerName)
}
data := tlsConfig{
// Skip the error check, since we are only interested in the value of
// status.WarningValidation.
status := &tlsConfigStatus{}
_ = loadTLSConf(&setts.tlsConfigSettings, status)
resp := tlsConfig{
tlsConfigSettingsExt: setts,
tlsConfigStatus: status,
}
marshalTLS(w, r, data)
marshalTLS(w, r, resp)
}
func (t *TLSMod) setConfig(newConf tlsConfigSettings, status tlsConfigStatus) (restartHTTPS bool) {
t.confLock.Lock()
defer t.confLock.Unlock()
func (m *tlsManager) setConfig(newConf tlsConfigSettings, status *tlsConfigStatus) (restartHTTPS bool) {
m.confLock.Lock()
defer m.confLock.Unlock()
// Reset the DNSCrypt data before comparing, since we currently do not
// accept these from the frontend.
//
// TODO(a.garipov): Define a custom comparer for dnsforward.TLSConfig.
newConf.DNSCryptConfigFile = t.conf.DNSCryptConfigFile
newConf.PortDNSCrypt = t.conf.PortDNSCrypt
if !cmp.Equal(t.conf, newConf, cmp.AllowUnexported(dnsforward.TLSConfig{})) {
newConf.DNSCryptConfigFile = m.conf.DNSCryptConfigFile
newConf.PortDNSCrypt = m.conf.PortDNSCrypt
if !cmp.Equal(m.conf, newConf, cmp.AllowUnexported(dnsforward.TLSConfig{})) {
log.Info("tls config has changed, restarting https server")
restartHTTPS = true
} else {
log.Info("tls config has not changed")
log.Info("tls: config has not changed")
}
// Note: don't do just `t.conf = data` because we must preserve all other members of t.conf
t.conf.Enabled = newConf.Enabled
t.conf.ServerName = newConf.ServerName
t.conf.ForceHTTPS = newConf.ForceHTTPS
t.conf.PortHTTPS = newConf.PortHTTPS
t.conf.PortDNSOverTLS = newConf.PortDNSOverTLS
t.conf.PortDNSOverQUIC = newConf.PortDNSOverQUIC
t.conf.CertificateChain = newConf.CertificateChain
t.conf.CertificatePath = newConf.CertificatePath
t.conf.CertificateChainData = newConf.CertificateChainData
t.conf.PrivateKey = newConf.PrivateKey
t.conf.PrivateKeyPath = newConf.PrivateKeyPath
t.conf.PrivateKeyData = newConf.PrivateKeyData
t.status = status
m.conf.Enabled = newConf.Enabled
m.conf.ServerName = newConf.ServerName
m.conf.ForceHTTPS = newConf.ForceHTTPS
m.conf.PortHTTPS = newConf.PortHTTPS
m.conf.PortDNSOverTLS = newConf.PortDNSOverTLS
m.conf.PortDNSOverQUIC = newConf.PortDNSOverQUIC
m.conf.CertificateChain = newConf.CertificateChain
m.conf.CertificatePath = newConf.CertificatePath
m.conf.CertificateChainData = newConf.CertificateChainData
m.conf.PrivateKey = newConf.PrivateKey
m.conf.PrivateKeyPath = newConf.PrivateKeyPath
m.conf.PrivateKeyData = newConf.PrivateKeyData
m.status = status
return restartHTTPS
}
func (t *TLSMod) handleTLSConfigure(w http.ResponseWriter, r *http.Request) {
data, err := unmarshalTLS(r)
func (m *tlsManager) handleTLSConfigure(w http.ResponseWriter, r *http.Request) {
req, err := unmarshalTLS(r)
if err != nil {
aghhttp.Error(r, w, http.StatusBadRequest, "Failed to unmarshal TLS config: %s", err)
return
}
if data.PrivateKeySaved {
data.PrivateKey = t.conf.PrivateKey
if req.PrivateKeySaved {
req.PrivateKey = m.conf.PrivateKey
}
if data.Enabled {
if req.Enabled {
err = validatePorts(
tcpPort(config.BindPort),
tcpPort(config.BetaBindPort),
tcpPort(data.PortHTTPS),
tcpPort(data.PortDNSOverTLS),
tcpPort(data.PortDNSCrypt),
tcpPort(req.PortHTTPS),
tcpPort(req.PortDNSOverTLS),
tcpPort(req.PortDNSCrypt),
udpPort(config.DNS.Port),
udpPort(data.PortDNSOverQUIC),
udpPort(req.PortDNSOverQUIC),
)
if err != nil {
aghhttp.Error(r, w, http.StatusBadRequest, "%s", err)
@ -354,33 +393,33 @@ func (t *TLSMod) handleTLSConfigure(w http.ResponseWriter, r *http.Request) {
}
// TODO(e.burkov): Investigate and perhaps check other ports.
if !webCheckPortAvailable(data.PortHTTPS) {
if !webCheckPortAvailable(req.PortHTTPS) {
aghhttp.Error(
r,
w,
http.StatusBadRequest,
"port %d is not available, cannot enable HTTPS on it",
data.PortHTTPS,
"port %d is not available, cannot enable https on it",
req.PortHTTPS,
)
return
}
status := tlsConfigStatus{}
if !tlsLoadConfig(&data.tlsConfigSettings, &status) {
data2 := tlsConfig{
tlsConfigSettingsExt: data,
tlsConfigStatus: t.status,
status := &tlsConfigStatus{}
err = loadTLSConf(&req.tlsConfigSettings, status)
if err != nil {
resp := tlsConfig{
tlsConfigSettingsExt: req,
tlsConfigStatus: status,
}
marshalTLS(w, r, data2)
marshalTLS(w, r, resp)
return
}
status = validateCertificates(string(data.CertificateChainData), string(data.PrivateKeyData), data.ServerName)
restartHTTPS := t.setConfig(data.tlsConfigSettings, status)
t.setCertFileTime()
restartHTTPS := m.setConfig(req.tlsConfigSettings, status)
m.setCertFileTime()
onConfigModified()
err = reconfigureDNSServer()
@ -390,12 +429,12 @@ func (t *TLSMod) handleTLSConfigure(w http.ResponseWriter, r *http.Request) {
return
}
data2 := tlsConfig{
tlsConfigSettingsExt: data,
tlsConfigStatus: t.status,
resp := tlsConfig{
tlsConfigSettingsExt: req,
tlsConfigStatus: m.status,
}
marshalTLS(w, r, data2)
marshalTLS(w, r, resp)
if f, ok := w.(http.Flusher); ok {
f.Flush()
}
@ -406,7 +445,7 @@ func (t *TLSMod) handleTLSConfigure(w http.ResponseWriter, r *http.Request) {
// same reason.
if restartHTTPS {
go func() {
Context.web.TLSConfigChanged(context.Background(), data.tlsConfigSettings)
Context.web.TLSConfigChanged(context.Background(), req.tlsConfigSettings)
}()
}
}
@ -443,89 +482,105 @@ func validatePorts(
return nil
}
func verifyCertChain(data *tlsConfigStatus, certChain, serverName string) error {
log.Tracef("TLS: got certificate: %d bytes", len(certChain))
// validateCertChain validates the certificate chain and sets data in status.
// The returned error is also set in status.WarningValidation.
func validateCertChain(status *tlsConfigStatus, certChain []byte, serverName string) (err error) {
defer func() {
if err != nil {
status.WarningValidation = err.Error()
}
}()
// now do a more extended validation
var certs []*pem.Block // PEM-encoded certificates
log.Debug("tls: got certificate chain: %d bytes", len(certChain))
pemblock := []byte(certChain)
var certs []*pem.Block
pemblock := certChain
for {
var decoded *pem.Block
decoded, pemblock = pem.Decode(pemblock)
if decoded == nil {
break
}
if decoded.Type == "CERTIFICATE" {
certs = append(certs, decoded)
}
}
var parsedCerts []*x509.Certificate
for _, cert := range certs {
parsed, err := x509.ParseCertificate(cert.Bytes)
parsedCerts, err := parsePEMCerts(certs)
if err != nil {
data.WarningValidation = fmt.Sprintf("Failed to parse certificate: %s", err)
return errors.Error(data.WarningValidation)
}
parsedCerts = append(parsedCerts, parsed)
return err
}
if len(parsedCerts) == 0 {
data.WarningValidation = "You have specified an empty certificate"
return errors.Error(data.WarningValidation)
}
data.ValidCert = true
// spew.Dump(parsedCerts)
status.ValidCert = true
opts := x509.VerifyOptions{
DNSName: serverName,
Roots: Context.tlsRoots,
}
log.Printf("number of certs - %d", len(parsedCerts))
if len(parsedCerts) > 1 {
// set up an intermediate
log.Info("tls: number of certs: %d", len(parsedCerts))
pool := x509.NewCertPool()
for _, cert := range parsedCerts[1:] {
log.Printf("got an intermediate cert")
log.Info("tls: 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)
_, err = mainCert.Verify(opts)
if err != nil {
// let self-signed certs through
data.WarningValidation = fmt.Sprintf("Your certificate does not verify: %s", err)
// Let self-signed certs through and don't return this error.
status.WarningValidation = fmt.Sprintf("certificate does not verify: %s", err)
} else {
data.ValidChain = true
status.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
status.Subject = mainCert.Subject.String()
status.Issuer = mainCert.Issuer.String()
status.NotAfter = mainCert.NotAfter
status.NotBefore = mainCert.NotBefore
status.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
// parsePEMCerts parses multiple PEM-encoded certificates.
func parsePEMCerts(certs []*pem.Block) (parsedCerts []*x509.Certificate, err error) {
for i, cert := range certs {
var parsed *x509.Certificate
parsed, err = x509.ParseCertificate(cert.Bytes)
if err != nil {
return nil, fmt.Errorf("parsing certificate at index %d: %w", i, err)
}
// go through all pem blocks, but take first valid pem block and drop the rest
parsedCerts = append(parsedCerts, parsed)
}
if len(parsedCerts) == 0 {
return nil, errors.Error("empty certificate")
}
return parsedCerts, nil
}
// validatePKey validates the private key and sets data in status. The returned
// error is also set in status.WarningValidation.
func validatePKey(status *tlsConfigStatus, pkey []byte) (err error) {
defer func() {
if err != nil {
status.WarningValidation = err.Error()
}
}()
var key *pem.Block
// Go through all pem blocks, but take first valid pem block and drop the
// rest.
pemblock := []byte(pkey)
for {
var decoded *pem.Block
@ -542,61 +597,77 @@ func validatePkey(data *tlsConfigStatus, pkey string) error {
}
if key == nil {
data.WarningValidation = "No valid keys were found"
return errors.Error(data.WarningValidation)
return errors.Error("no valid keys were found")
}
// 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.Error(data.WarningValidation)
} else if keyType == keyTypeED25519 {
data.WarningValidation = "ED25519 keys are not supported by browsers; " +
"did you mean to use X25519 for key exchange?"
return errors.Error(data.WarningValidation)
return fmt.Errorf("parsing private key: %w", err)
}
data.ValidKey = true
data.KeyType = keyType
if keyType == keyTypeED25519 {
return errors.Error(
"ED25519 keys are not supported by browsers; " +
"did you mean to use X25519 for key exchange?",
)
}
status.ValidKey = true
status.KeyType = keyType
return nil
}
// validateCertificates processes certificate data and its private key. All
// parameters are optional. On error, validateCertificates returns a partially
// set object with field WarningValidation containing error description.
func validateCertificates(certChain, pkey, serverName string) tlsConfigStatus {
var data tlsConfigStatus
// parameters are optional. status must not be nil. The returned error is also
// set in status.WarningValidation.
func validateCertificates(
status *tlsConfigStatus,
certChain []byte,
pkey []byte,
serverName string,
) (err error) {
defer func() {
// Capitalize the warning for the UI. Assume that warnings are all
// ASCII-only.
//
// TODO(a.garipov): Figure out a better way to do this. Perhaps a
// custom string or error type.
if w := status.WarningValidation; w != "" {
status.WarningValidation = strings.ToUpper(w[:1]) + w[1:]
}
}()
// 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))
// Check only the public certificate separately from the key.
if len(certChain) > 0 {
err = validateCertChain(status, certChain, serverName)
if err != nil {
data.WarningValidation = fmt.Sprintf("Invalid certificate or key: %s", err)
return data
return err
}
data.ValidPair = true
}
return data
// Validate the private key by parsing it.
if len(pkey) > 0 {
err = validatePKey(status, pkey)
if err != nil {
return err
}
}
// If both are set, validate together.
if len(certChain) > 0 && len(pkey) > 0 {
_, err = tls.X509KeyPair(certChain, pkey)
if err != nil {
err = fmt.Errorf("certificate-key pair: %w", err)
status.WarningValidation = err.Error()
return err
}
status.ValidPair = true
}
return nil
}
// Key types.
@ -691,9 +762,9 @@ func marshalTLS(w http.ResponseWriter, r *http.Request, data tlsConfig) {
_ = aghhttp.WriteJSONResponse(w, r, data)
}
// registerWebHandlers registers HTTP handlers for TLS configuration
func (t *TLSMod) registerWebHandlers() {
httpRegister(http.MethodGet, "/control/tls/status", t.handleTLSStatus)
httpRegister(http.MethodPost, "/control/tls/configure", t.handleTLSConfigure)
httpRegister(http.MethodPost, "/control/tls/validate", t.handleTLSValidate)
// registerWebHandlers registers HTTP handlers for TLS configuration.
func (m *tlsManager) registerWebHandlers() {
httpRegister(http.MethodGet, "/control/tls/status", m.handleTLSStatus)
httpRegister(http.MethodPost, "/control/tls/configure", m.handleTLSConfigure)
httpRegister(http.MethodPost, "/control/tls/validate", m.handleTLSValidate)
}

59
internal/home/tls_internal_test.go
View File

@ -7,8 +7,7 @@ import (
"github.com/stretchr/testify/assert"
)
const (
CertificateChain = `-----BEGIN CERTIFICATE-----
var testCertChainData = []byte(`-----BEGIN CERTIFICATE-----
MIICKzCCAZSgAwIBAgIJAMT9kPVJdM7LMA0GCSqGSIb3DQEBCwUAMC0xFDASBgNV
BAoMC0FkR3VhcmQgTHRkMRUwEwYDVQQDDAxBZEd1YXJkIEhvbWUwHhcNMTkwMjI3
MDkyNDIzWhcNNDYwNzE0MDkyNDIzWjAtMRQwEgYDVQQKDAtBZEd1YXJkIEx0ZDEV
@ -21,8 +20,9 @@ eKO029jYd2AAZEQwDwYDVR0TAQH/BAUwAwEB/zANBgkqhkiG9w0BAQsFAAOBgQB8
LwlXfbakf7qkVTlCNXgoY7RaJ8rJdPgOZPoCTVToEhT6u/cb1c2qp8QB0dNExDna
b0Z+dnODTZqQOJo6z/wIXlcUrnR4cQVvytXt8lFn+26l6Y6EMI26twC/xWr+1swq
Muj4FeWHVDerquH4yMr1jsYLD3ci+kc5sbIX6TfVxQ==
-----END CERTIFICATE-----`
PrivateKey = `-----BEGIN PRIVATE KEY-----
-----END CERTIFICATE-----`)
var testPrivateKeyData = []byte(`-----BEGIN PRIVATE KEY-----
MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBALC/BSc8mI68tw5p
aYa7pjrySwWvXeetcFywOWHGVfLw9qiFWLdfESa3Y6tWMpZAXD9t1Xh9n211YUBV
FGSB4ZshnM/tgEPU6t787lJD4NsIIRp++MkJxdAitN4oUTqL0bdpIwezQ/CrYuBX
@ -37,36 +37,43 @@ An/jMjZSMCxNl6UyFcqt5Et1EGVhuFECQQCZLXxaT+qcyHjlHJTMzuMgkz1QFbEp
O5EX70gpeGQMPDK0QSWpaazg956njJSDbNCFM4BccrdQbJu1cW4qOsfBAkAMgZuG
O88slmgTRHX4JGFmy3rrLiHNI2BbJSuJ++Yllz8beVzh6NfvuY+HKRCmPqoBPATU
kXS9jgARhhiWXJrk
-----END PRIVATE KEY-----`
)
-----END PRIVATE KEY-----`)
func TestValidateCertificates(t *testing.T) {
t.Run("bad_certificate", func(t *testing.T) {
data := validateCertificates("bad cert", "", "")
assert.NotEmpty(t, data.WarningValidation)
assert.False(t, data.ValidCert)
assert.False(t, data.ValidChain)
status := &tlsConfigStatus{}
err := validateCertificates(status, []byte("bad cert"), nil, "")
assert.Error(t, err)
assert.NotEmpty(t, status.WarningValidation)
assert.False(t, status.ValidCert)
assert.False(t, status.ValidChain)
})
t.Run("bad_private_key", func(t *testing.T) {
data := validateCertificates("", "bad priv key", "")
assert.NotEmpty(t, data.WarningValidation)
assert.False(t, data.ValidKey)
status := &tlsConfigStatus{}
err := validateCertificates(status, nil, []byte("bad priv key"), "")
assert.Error(t, err)
assert.NotEmpty(t, status.WarningValidation)
assert.False(t, status.ValidKey)
})
t.Run("valid", func(t *testing.T) {
data := validateCertificates(CertificateChain, PrivateKey, "")
notBefore, _ := time.Parse(time.RFC3339, "2019-02-27T09:24:23Z")
notAfter, _ := time.Parse(time.RFC3339, "2046-07-14T09:24:23Z")
assert.NotEmpty(t, data.WarningValidation)
assert.True(t, data.ValidCert)
assert.False(t, data.ValidChain)
assert.True(t, data.ValidKey)
assert.Equal(t, "RSA", data.KeyType)
assert.Equal(t, "CN=AdGuard Home,O=AdGuard Ltd", data.Subject)
assert.Equal(t, "CN=AdGuard Home,O=AdGuard Ltd", data.Issuer)
assert.Equal(t, notBefore, data.NotBefore)
assert.Equal(t, notAfter, data.NotAfter)
assert.True(t, data.ValidPair)
status := &tlsConfigStatus{}
err := validateCertificates(status, testCertChainData, testPrivateKeyData, "")
assert.NoError(t, err)
notBefore := time.Date(2019, 2, 27, 9, 24, 23, 0, time.UTC)
notAfter := time.Date(2046, 7, 14, 9, 24, 23, 0, time.UTC)
assert.NotEmpty(t, status.WarningValidation)
assert.True(t, status.ValidCert)
assert.False(t, status.ValidChain)
assert.True(t, status.ValidKey)
assert.Equal(t, "RSA", status.KeyType)
assert.Equal(t, "CN=AdGuard Home,O=AdGuard Ltd", status.Subject)
assert.Equal(t, "CN=AdGuard Home,O=AdGuard Ltd", status.Issuer)
assert.Equal(t, notBefore, status.NotBefore)
assert.Equal(t, notAfter, status.NotAfter)
assert.True(t, status.ValidPair)
})
}