mirror of
https://github.com/AdguardTeam/AdGuardHome.git
synced 2024-11-26 15:05:50 +03:00
338 lines
9.4 KiB
Go
338 lines
9.4 KiB
Go
// Control: TLS configuring handlers
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package home
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import (
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"context"
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"crypto"
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"crypto/ecdsa"
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"crypto/rsa"
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"crypto/tls"
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"crypto/x509"
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"encoding/base64"
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"encoding/json"
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"encoding/pem"
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"errors"
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"fmt"
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"net/http"
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"reflect"
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"strings"
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"time"
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"github.com/AdguardTeam/golibs/log"
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"github.com/joomcode/errorx"
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)
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// RegisterTLSHandlers registers HTTP handlers for TLS configuration
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func RegisterTLSHandlers() {
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http.HandleFunc("/control/tls/status", postInstall(optionalAuth(ensureGET(handleTLSStatus))))
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http.HandleFunc("/control/tls/configure", postInstall(optionalAuth(ensurePOST(handleTLSConfigure))))
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http.HandleFunc("/control/tls/validate", postInstall(optionalAuth(ensurePOST(handleTLSValidate))))
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}
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func handleTLSStatus(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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marshalTLS(w, config.TLS)
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}
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func handleTLSValidate(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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data, err := unmarshalTLS(r)
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if err != nil {
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httpError(w, http.StatusBadRequest, "Failed to unmarshal TLS config: %s", err)
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return
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}
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// check if port is available
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// BUT: if we are already using this port, no need
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alreadyRunning := false
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if config.httpsServer.server != nil {
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alreadyRunning = true
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}
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if !alreadyRunning {
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err = checkPortAvailable(config.BindHost, data.PortHTTPS)
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if err != nil {
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httpError(w, http.StatusBadRequest, "port %d is not available, cannot enable HTTPS on it", data.PortHTTPS)
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return
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}
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}
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data.tlsConfigStatus = validateCertificates(data.CertificateChain, data.PrivateKey, data.ServerName)
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marshalTLS(w, data)
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}
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func handleTLSConfigure(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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data, err := unmarshalTLS(r)
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if err != nil {
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httpError(w, http.StatusBadRequest, "Failed to unmarshal TLS config: %s", err)
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return
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}
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// check if port is available
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// BUT: if we are already using this port, no need
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alreadyRunning := false
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if config.httpsServer.server != nil {
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alreadyRunning = true
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}
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if !alreadyRunning {
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err = checkPortAvailable(config.BindHost, data.PortHTTPS)
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if err != nil {
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httpError(w, http.StatusBadRequest, "port %d is not available, cannot enable HTTPS on it", data.PortHTTPS)
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return
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}
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}
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restartHTTPS := false
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data.tlsConfigStatus = validateCertificates(data.CertificateChain, data.PrivateKey, data.ServerName)
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if !reflect.DeepEqual(config.TLS.tlsConfigSettings, data.tlsConfigSettings) {
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log.Printf("tls config settings have changed, will restart HTTPS server")
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restartHTTPS = true
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}
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config.TLS = data
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err = writeAllConfigsAndReloadDNS()
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't write config file: %s", err)
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return
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}
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marshalTLS(w, data)
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// this needs to be done in a goroutine because Shutdown() is a blocking call, and it will block
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// until all requests are finished, and _we_ are inside a request right now, so it will block indefinitely
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if restartHTTPS {
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go func() {
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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
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config.httpsServer.cond.L.Lock()
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config.httpsServer.cond.Broadcast()
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if config.httpsServer.server != nil {
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config.httpsServer.server.Shutdown(context.TODO())
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}
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config.httpsServer.cond.L.Unlock()
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}()
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}
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}
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func verifyCertChain(data *tlsConfigStatus, certChain string, serverName string) error {
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log.Tracef("got certificate: %s", certChain)
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// now do a more extended validation
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var certs []*pem.Block // PEM-encoded certificates
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var skippedBytes []string // skipped bytes
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pemblock := []byte(certChain)
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for {
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var decoded *pem.Block
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decoded, pemblock = pem.Decode(pemblock)
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if decoded == nil {
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break
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}
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if decoded.Type == "CERTIFICATE" {
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certs = append(certs, decoded)
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} else {
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skippedBytes = append(skippedBytes, decoded.Type)
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}
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}
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var parsedCerts []*x509.Certificate
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for _, cert := range certs {
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parsed, err := x509.ParseCertificate(cert.Bytes)
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if err != nil {
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data.WarningValidation = fmt.Sprintf("Failed to parse certificate: %s", err)
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return errors.New(data.WarningValidation)
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}
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parsedCerts = append(parsedCerts, parsed)
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}
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if len(parsedCerts) == 0 {
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data.WarningValidation = fmt.Sprintf("You have specified an empty certificate")
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return errors.New(data.WarningValidation)
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}
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data.ValidCert = true
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// spew.Dump(parsedCerts)
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opts := x509.VerifyOptions{
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DNSName: serverName,
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}
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log.Printf("number of certs - %d", len(parsedCerts))
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if len(parsedCerts) > 1 {
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// set up an intermediate
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pool := x509.NewCertPool()
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for _, cert := range parsedCerts[1:] {
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log.Printf("got an intermediate cert")
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pool.AddCert(cert)
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}
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opts.Intermediates = pool
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}
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// TODO: save it as a warning rather than error it out -- shouldn't be a big problem
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mainCert := parsedCerts[0]
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_, err := mainCert.Verify(opts)
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if err != nil {
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// let self-signed certs through
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data.WarningValidation = fmt.Sprintf("Your certificate does not verify: %s", err)
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} else {
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data.ValidChain = true
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}
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// spew.Dump(chains)
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// update status
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if mainCert != nil {
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notAfter := mainCert.NotAfter
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data.Subject = mainCert.Subject.String()
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data.Issuer = mainCert.Issuer.String()
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data.NotAfter = notAfter
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data.NotBefore = mainCert.NotBefore
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data.DNSNames = mainCert.DNSNames
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}
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return nil
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}
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func validatePkey(data *tlsConfigStatus, pkey string) error {
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// now do a more extended validation
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var key *pem.Block // PEM-encoded certificates
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var skippedBytes []string // skipped bytes
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// go through all pem blocks, but take first valid pem block and drop the rest
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pemblock := []byte(pkey)
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for {
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var decoded *pem.Block
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decoded, pemblock = pem.Decode(pemblock)
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if decoded == nil {
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break
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}
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if decoded.Type == "PRIVATE KEY" || strings.HasSuffix(decoded.Type, " PRIVATE KEY") {
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key = decoded
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break
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} else {
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skippedBytes = append(skippedBytes, decoded.Type)
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}
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}
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if key == nil {
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data.WarningValidation = "No valid keys were found"
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return errors.New(data.WarningValidation)
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}
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// parse the decoded key
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_, keytype, err := parsePrivateKey(key.Bytes)
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if err != nil {
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data.WarningValidation = fmt.Sprintf("Failed to parse private key: %s", err)
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return errors.New(data.WarningValidation)
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}
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data.ValidKey = true
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data.KeyType = keytype
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return nil
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}
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// Process certificate data and its private key.
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// All parameters are optional.
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// On error, return partially set object
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// with 'WarningValidation' field containing error description.
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func validateCertificates(certChain, pkey, serverName string) tlsConfigStatus {
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var data tlsConfigStatus
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// check only public certificate separately from the key
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if certChain != "" {
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if verifyCertChain(&data, certChain, serverName) != nil {
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return data
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}
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}
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// validate private key (right now the only validation possible is just parsing it)
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if pkey != "" {
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if validatePkey(&data, pkey) != nil {
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return data
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}
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}
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// if both are set, validate both in unison
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if pkey != "" && certChain != "" {
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_, err := tls.X509KeyPair([]byte(certChain), []byte(pkey))
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if err != nil {
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data.WarningValidation = fmt.Sprintf("Invalid certificate or key: %s", err)
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return data
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}
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data.ValidPair = true
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}
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return data
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}
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// Attempt to parse the given private key DER block. OpenSSL 0.9.8 generates
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// PKCS#1 private keys by default, while OpenSSL 1.0.0 generates PKCS#8 keys.
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// OpenSSL ecparam generates SEC1 EC private keys for ECDSA. We try all three.
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func parsePrivateKey(der []byte) (crypto.PrivateKey, string, error) {
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if key, err := x509.ParsePKCS1PrivateKey(der); err == nil {
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return key, "RSA", nil
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}
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if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
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switch key := key.(type) {
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case *rsa.PrivateKey:
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return key, "RSA", nil
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case *ecdsa.PrivateKey:
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return key, "ECDSA", nil
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default:
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return nil, "", errors.New("tls: found unknown private key type in PKCS#8 wrapping")
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}
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}
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if key, err := x509.ParseECPrivateKey(der); err == nil {
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return key, "ECDSA", nil
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}
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return nil, "", errors.New("tls: failed to parse private key")
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}
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// unmarshalTLS handles base64-encoded certificates transparently
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func unmarshalTLS(r *http.Request) (tlsConfig, error) {
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data := tlsConfig{}
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err := json.NewDecoder(r.Body).Decode(&data)
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if err != nil {
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return data, errorx.Decorate(err, "Failed to parse new TLS config json")
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}
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if data.CertificateChain != "" {
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certPEM, err := base64.StdEncoding.DecodeString(data.CertificateChain)
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if err != nil {
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return data, errorx.Decorate(err, "Failed to base64-decode certificate chain")
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}
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data.CertificateChain = string(certPEM)
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}
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if data.PrivateKey != "" {
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keyPEM, err := base64.StdEncoding.DecodeString(data.PrivateKey)
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if err != nil {
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return data, errorx.Decorate(err, "Failed to base64-decode private key")
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}
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data.PrivateKey = string(keyPEM)
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}
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return data, nil
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}
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func marshalTLS(w http.ResponseWriter, data tlsConfig) {
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w.Header().Set("Content-Type", "application/json")
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if data.CertificateChain != "" {
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encoded := base64.StdEncoding.EncodeToString([]byte(data.CertificateChain))
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data.CertificateChain = encoded
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}
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if data.PrivateKey != "" {
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encoded := base64.StdEncoding.EncodeToString([]byte(data.PrivateKey))
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data.PrivateKey = encoded
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}
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err := json.NewEncoder(w).Encode(data)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Failed to marshal json with TLS status: %s", err)
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return
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}
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}
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