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Make internal SSH server host key path configurable (#14918)

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* Make SSH server host key path configurable

* make it possible to have multiple keys

* Make gitea.rsa the default key

* Add some more logging

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2021-03-08 02:43:59 +00:00 committed by GitHub
parent 78b7529cd4
commit c03f530212
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
10 changed files with 62 additions and 40 deletions
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12
cmd/web.go
View file

@ -64,7 +64,7 @@ func runHTTPRedirector() {
http.Redirect(w, r, target, http.StatusTemporaryRedirect)
})
var err = runHTTP("tcp", source, context2.ClearHandler(handler))
var err = runHTTP("tcp", source, "HTTP Redirector", context2.ClearHandler(handler))
if err != nil {
log.Fatal("Failed to start port redirection: %v", err)
@ -198,7 +198,7 @@ func listen(m http.Handler, handleRedirector bool) error {
if handleRedirector {
NoHTTPRedirector()
}
err = runHTTP("tcp", listenAddr, context2.ClearHandler(m))
err = runHTTP("tcp", listenAddr, "Web", context2.ClearHandler(m))
case setting.HTTPS:
if setting.EnableLetsEncrypt {
err = runLetsEncrypt(listenAddr, setting.Domain, setting.LetsEncryptDirectory, setting.LetsEncryptEmail, context2.ClearHandler(m))
@ -211,22 +211,22 @@ func listen(m http.Handler, handleRedirector bool) error {
NoHTTPRedirector()
}
}
err = runHTTPS("tcp", listenAddr, setting.CertFile, setting.KeyFile, context2.ClearHandler(m))
err = runHTTPS("tcp", listenAddr, "Web", setting.CertFile, setting.KeyFile, context2.ClearHandler(m))
case setting.FCGI:
if handleRedirector {
NoHTTPRedirector()
}
err = runFCGI("tcp", listenAddr, context2.ClearHandler(m))
err = runFCGI("tcp", listenAddr, "FCGI Web", context2.ClearHandler(m))
case setting.UnixSocket:
if handleRedirector {
NoHTTPRedirector()
}
err = runHTTP("unix", listenAddr, context2.ClearHandler(m))
err = runHTTP("unix", listenAddr, "Web", context2.ClearHandler(m))
case setting.FCGIUnix:
if handleRedirector {
NoHTTPRedirector()
}
err = runFCGI("unix", listenAddr, context2.ClearHandler(m))
err = runFCGI("unix", listenAddr, "Web", context2.ClearHandler(m))
default:
log.Fatal("Invalid protocol: %s", setting.Protocol)
}

16
cmd/web_graceful.go
View file

@ -14,16 +14,16 @@ import (
"code.gitea.io/gitea/modules/log"
)
func runHTTP(network, listenAddr string, m http.Handler) error {
return graceful.HTTPListenAndServe(network, listenAddr, m)
func runHTTP(network, listenAddr, name string, m http.Handler) error {
return graceful.HTTPListenAndServe(network, listenAddr, name, m)
}
func runHTTPS(network, listenAddr, certFile, keyFile string, m http.Handler) error {
return graceful.HTTPListenAndServeTLS(network, listenAddr, certFile, keyFile, m)
func runHTTPS(network, listenAddr, name, certFile, keyFile string, m http.Handler) error {
return graceful.HTTPListenAndServeTLS(network, listenAddr, name, certFile, keyFile, m)
}
func runHTTPSWithTLSConfig(network, listenAddr string, tlsConfig *tls.Config, m http.Handler) error {
return graceful.HTTPListenAndServeTLSConfig(network, listenAddr, tlsConfig, m)
func runHTTPSWithTLSConfig(network, listenAddr, name string, tlsConfig *tls.Config, m http.Handler) error {
return graceful.HTTPListenAndServeTLSConfig(network, listenAddr, name, tlsConfig, m)
}
// NoHTTPRedirector tells our cleanup routine that we will not be using a fallback http redirector
@ -43,9 +43,9 @@ func NoInstallListener() {
graceful.GetManager().InformCleanup()
}
func runFCGI(network, listenAddr string, m http.Handler) error {
func runFCGI(network, listenAddr, name string, m http.Handler) error {
// This needs to handle stdin as fcgi point
fcgiServer := graceful.NewServer(network, listenAddr)
fcgiServer := graceful.NewServer(network, listenAddr, name)
err := fcgiServer.ListenAndServe(func(listener net.Listener) error {
return fcgi.Serve(listener, m)

4
cmd/web_letsencrypt.go
View file

@ -46,14 +46,14 @@ func runLetsEncrypt(listenAddr, domain, directory, email string, m http.Handler)
go func() {
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)
var err = runHTTP("tcp", setting.HTTPAddr+":"+setting.PortToRedirect, myACME.HTTPChallengeHandler(http.HandlerFunc(runLetsEncryptFallbackHandler)))
var 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, tlsConfig, context2.ClearHandler(m))
return runHTTPSWithTLSConfig("tcp", listenAddr, "Web", tlsConfig, context2.ClearHandler(m))
}
func runLetsEncryptFallbackHandler(w http.ResponseWriter, r *http.Request) {

4
custom/conf/app.example.ini
View file

@ -319,6 +319,10 @@ SSH_SERVER_KEY_EXCHANGES = diffie-hellman-group1-sha1, diffie-hellman-group14-sh
; For the built-in SSH server, choose the MACs to support for SSH connections,
; for system SSH this setting has no effect
SSH_SERVER_MACS = hmac-sha2-256-etm@openssh.com, hmac-sha2-256, hmac-sha1, hmac-sha1-96
; For the built-in SSH server, choose the keypair to offer as the host key
; The private key should be at SSH_SERVER_HOST_KEY and the public SSH_SERVER_HOST_KEY.pub
; relative paths are made absolute relative to the APP_DATA_PATH
SSH_SERVER_HOST_KEYS=ssh/gitea.rsa, ssh/gogs.rsa
; Directory to create temporary files in when testing public keys using ssh-keygen,
; default is the system temporary directory.
SSH_KEY_TEST_PATH =

1
docs/content/doc/advanced/config-cheat-sheet.en-us.md
View file

@ -256,6 +256,7 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
- `SSH_SERVER_CIPHERS`: **aes128-ctr, aes192-ctr, aes256-ctr, aes128-gcm@openssh.com, arcfour256, arcfour128**: For the built-in SSH server, choose the ciphers to support for SSH connections, for system SSH this setting has no effect.
- `SSH_SERVER_KEY_EXCHANGES`: **diffie-hellman-group1-sha1, diffie-hellman-group14-sha1, ecdh-sha2-nistp256, ecdh-sha2-nistp384, ecdh-sha2-nistp521, curve25519-sha256@libssh.org**: For the built-in SSH server, choose the key exchange algorithms to support for SSH connections, for system SSH this setting has no effect.
- `SSH_SERVER_MACS`: **hmac-sha2-256-etm@openssh.com, hmac-sha2-256, hmac-sha1, hmac-sha1-96**: For the built-in SSH server, choose the MACs to support for SSH connections, for system SSH this setting has no effect
- `SSH_SERVER_HOST_KEYS`: **ssh/gitea.rsa, ssh/gogs.rsa**: For the built-in SSH server, choose the keypairs to offer as the host key. The private key should be at `SSH_SERVER_HOST_KEY` and the public `SSH_SERVER_HOST_KEY.pub`. Relative paths are made absolute relative to the `APP_DATA_PATH`. If no key exists a 4096 bit RSA key will be created for you.
- `SSH_KEY_TEST_PATH`: **/tmp**: Directory to create temporary files in when testing public keys using ssh-keygen, default is the system temporary directory.
- `SSH_KEYGEN_PATH`: **ssh-keygen**: Path to ssh-keygen, default is 'ssh-keygen' which means the shell is responsible for finding out which one to call.
- `SSH_EXPOSE_ANONYMOUS`: **false**: Enable exposure of SSH clone URL to anonymous visitors, default is false.

6
modules/graceful/server.go
View file

@ -48,11 +48,11 @@ type Server struct {
}
// NewServer creates a server on network at provided address
func NewServer(network, address string) *Server {
func NewServer(network, address, name string) *Server {
if GetManager().IsChild() {
log.Info("Restarting new server: %s:%s on PID: %d", network, address, os.Getpid())
log.Info("Restarting new %s server: %s:%s on PID: %d", name, network, address, os.Getpid())
} else {
log.Info("Starting new server: %s:%s on PID: %d", network, address, os.Getpid())
log.Info("Starting new %s server: %s:%s on PID: %d", name, network, address, os.Getpid())
}
srv := &Server{
wg: sync.WaitGroup{},

16
modules/graceful/server_http.go
View file

@ -9,8 +9,8 @@ import (
"net/http"
)
func newHTTPServer(network, address string, handler http.Handler) (*Server, ServeFunction) {
server := NewServer(network, address)
func newHTTPServer(network, address, name string, handler http.Handler) (*Server, ServeFunction) {
server := NewServer(network, address, name)
httpServer := http.Server{
ReadTimeout: DefaultReadTimeOut,
WriteTimeout: DefaultWriteTimeOut,
@ -25,21 +25,21 @@ func newHTTPServer(network, address string, handler http.Handler) (*Server, Serv
// HTTPListenAndServe listens on the provided network address and then calls Serve
// to handle requests on incoming connections.
func HTTPListenAndServe(network, address string, handler http.Handler) error {
server, lHandler := newHTTPServer(network, address, handler)
func HTTPListenAndServe(network, address, name string, handler http.Handler) error {
server, lHandler := newHTTPServer(network, address, name, handler)
return server.ListenAndServe(lHandler)
}
// HTTPListenAndServeTLS listens on the provided network address and then calls Serve
// to handle requests on incoming connections.
func HTTPListenAndServeTLS(network, address, certFile, keyFile string, handler http.Handler) error {
server, lHandler := newHTTPServer(network, address, handler)
func HTTPListenAndServeTLS(network, address, name, certFile, keyFile string, handler http.Handler) error {
server, lHandler := newHTTPServer(network, address, name, handler)
return server.ListenAndServeTLS(certFile, keyFile, lHandler)
}
// HTTPListenAndServeTLSConfig listens on the provided network address and then calls Serve
// to handle requests on incoming connections.
func HTTPListenAndServeTLSConfig(network, address string, tlsConfig *tls.Config, handler http.Handler) error {
server, lHandler := newHTTPServer(network, address, handler)
func HTTPListenAndServeTLSConfig(network, address, name string, tlsConfig *tls.Config, handler http.Handler) error {
server, lHandler := newHTTPServer(network, address, name, handler)
return server.ListenAndServeTLSConfig(tlsConfig, lHandler)
}

7
modules/setting/setting.go
View file

@ -132,6 +132,7 @@ var (
ServerCiphers []string `ini:"SSH_SERVER_CIPHERS"`
ServerKeyExchanges []string `ini:"SSH_SERVER_KEY_EXCHANGES"`
ServerMACs []string `ini:"SSH_SERVER_MACS"`
ServerHostKeys []string `ini:"SSH_SERVER_HOST_KEYS"`
KeyTestPath string `ini:"SSH_KEY_TEST_PATH"`
KeygenPath string `ini:"SSH_KEYGEN_PATH"`
AuthorizedKeysBackup bool `ini:"SSH_AUTHORIZED_KEYS_BACKUP"`
@ -157,6 +158,7 @@ var (
KeygenPath: "ssh-keygen",
MinimumKeySizeCheck: true,
MinimumKeySizes: map[string]int{"ed25519": 256, "ed25519-sk": 256, "ecdsa": 256, "ecdsa-sk": 256, "rsa": 2048},
ServerHostKeys: []string{"ssh/gitea.rsa", "ssh/gogs.rsa"},
}
// Security settings
@ -698,6 +700,11 @@ func NewContext() {
if err = Cfg.Section("server").MapTo(&SSH); err != nil {
log.Fatal("Failed to map SSH settings: %v", err)
}
for i, key := range SSH.ServerHostKeys {
if !filepath.IsAbs(key) {
SSH.ServerHostKeys[i] = filepath.Join(AppDataPath, key)
}
}
SSH.KeygenPath = sec.Key("SSH_KEYGEN_PATH").MustString("ssh-keygen")
SSH.Port = sec.Key("SSH_PORT").MustInt(22)

34
modules/ssh/ssh.go
View file

@ -259,28 +259,38 @@ func Listen(host string, port int, ciphers []string, keyExchanges []string, macs
},
}
keyPath := filepath.Join(setting.AppDataPath, "ssh/gogs.rsa")
isExist, err := util.IsExist(keyPath)
if err != nil {
log.Fatal("Unable to check if %s exists. Error: %v", keyPath, err)
keys := make([]string, 0, len(setting.SSH.ServerHostKeys))
for _, key := range setting.SSH.ServerHostKeys {
isExist, err := util.IsExist(key)
if err != nil {
log.Fatal("Unable to check if %s exists. Error: %v", setting.SSH.ServerHostKeys, err)
}
if isExist {
keys = append(keys, key)
}
}
if !isExist {
filePath := filepath.Dir(keyPath)
if len(keys) == 0 {
filePath := filepath.Dir(setting.SSH.ServerHostKeys[0])
if err := os.MkdirAll(filePath, os.ModePerm); err != nil {
log.Error("Failed to create dir %s: %v", filePath, err)
}
err := GenKeyPair(keyPath)
err := GenKeyPair(setting.SSH.ServerHostKeys[0])
if err != nil {
log.Fatal("Failed to generate private key: %v", err)
}
log.Trace("New private key is generated: %s", keyPath)
log.Trace("New private key is generated: %s", setting.SSH.ServerHostKeys[0])
keys = append(keys, setting.SSH.ServerHostKeys[0])
}
err = srv.SetOption(ssh.HostKeyFile(keyPath))
if err != nil {
log.Error("Failed to set Host Key. %s", err)
for _, key := range keys {
log.Info("Adding SSH host key: %s", key)
err := srv.SetOption(ssh.HostKeyFile(key))
if err != nil {
log.Error("Failed to set Host Key. %s", err)
}
}
go listen(&srv)
@ -291,7 +301,7 @@ func Listen(host string, port int, ciphers []string, keyExchanges []string, macs
// Public key is encoded in the format for inclusion in an OpenSSH authorized_keys file.
// Private Key generated is PEM encoded
func GenKeyPair(keyPath string) error {
privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
privateKey, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return err
}

2
modules/ssh/ssh_graceful.go
View file

@ -12,7 +12,7 @@ import (
)
func listen(server *ssh.Server) {
gracefulServer := graceful.NewServer("tcp", server.Addr)
gracefulServer := graceful.NewServer("tcp", server.Addr, "SSH")
err := gracefulServer.ListenAndServe(server.Serve)
if err != nil {