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Merge pull request #92850 from tallclair/netexec
Enhance agnhost netexec for SSRF E2Es
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17376e6aef
@ -393,7 +393,7 @@ Starts a HTTP(S) server on given port with the following endpoints:
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- `protocol`: The protocol which will be used when making the request. Default value: `http`.
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Acceptable values: `http`, `udp`, `sctp`.
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- `tries`: The number of times the request will be performed. Default value: `1`.
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- `/echo`: Returns the given `msg` (`/echo?msg=echoed_msg`)
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- `/echo`: Returns the given `msg` (`/echo?msg=echoed_msg`), with the optional status `code`.
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- `/exit`: Closes the server with the given code and graceful shutdown. The endpoint's parameters
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are:
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- `code`: The exit code for the process. Default value: 0. Allows an integer [0-127].
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@ -407,6 +407,8 @@ Starts a HTTP(S) server on given port with the following endpoints:
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it exited.
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- `/hostname`: Returns the server's hostname.
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- `/hostName`: Returns the server's hostname.
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- `/redirect`: Returns a redirect response to the given `location`, with the optional status `code`
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(`/redirect?location=/echo%3Fmsg=foobar&code=307`).
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- `/shell`: Executes the given `shellCommand` or `cmd` (`/shell?cmd=some-command`) and
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returns a JSON containing the fields `output` (command's output) and `error` (command's
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error message). Returns `200 OK` if the command succeeded, `417 Expectation Failed` if not.
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@ -419,6 +421,9 @@ If `--tls-cert-file` is added (ideally in conjunction with `--tls-private-key-fi
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will be upgraded to HTTPS. The image has default, `localhost`-based cert/privkey files at
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`/localhost.crt` and `/localhost.key` (see: [`porter` subcommand](#porter))
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If `--http-override` is set, the HTTP(S) server will always serve the override path & options,
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ignoring the request URL.
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It will also start a UDP server on the indicated UDP port that responds to the following commands:
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- `hostname`: Returns the server's hostname
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@ -47,6 +47,7 @@ var (
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serverReady = &atomicBool{0}
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certFile = ""
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privKeyFile = ""
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httpOverride = ""
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)
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// CmdNetexec is used by agnhost Cobra.
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@ -69,7 +70,7 @@ var CmdNetexec = &cobra.Command{
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- "protocol": The protocol which will be used when making the request. Default value: "http".
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Acceptable values: "http", "udp", "sctp".
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- "tries": The number of times the request will be performed. Default value: "1".
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- "/echo": Returns the given "msg" ("/echo?msg=echoed_msg")
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- "/echo": Returns the given "msg" ("/echo?msg=echoed_msg"), with the optional status "code".
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- "/exit": Closes the server with the given code and graceful shutdown. The endpoint's parameters
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are:
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- "code": The exit code for the process. Default value: 0. Allows an integer [0-127].
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@ -83,6 +84,8 @@ var CmdNetexec = &cobra.Command{
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it exited.
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- "/hostname": Returns the server's hostname.
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- "/hostName": Returns the server's hostname.
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- "/redirect": Returns a redirect response to the given "location", with the optional status "code"
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("/redirect?location=/echo%3Fmsg=foobar&code=307").
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- "/shell": Executes the given "shellCommand" or "cmd" ("/shell?cmd=some-command") and
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returns a JSON containing the fields "output" (command's output) and "error" (command's
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error message). Returns "200 OK" if the command succeeded, "417 Expectation Failed" if not.
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@ -91,6 +94,13 @@ var CmdNetexec = &cobra.Command{
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Returns a JSON with the fields "output" (containing the file's name on the server) and
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"error" containing any potential server side errors.
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If "--tls-cert-file" is added (ideally in conjunction with "--tls-private-key-file", the HTTP server
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will be upgraded to HTTPS. The image has default, "localhost"-based cert/privkey files at
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"/localhost.crt" and "/localhost.key" (see: "porter" subcommand)
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If "--http-override" is set, the HTTP(S) server will always serve the override path & options,
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ignoring the request URL.
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It will also start a UDP server on the indicated UDP port that responds to the following commands:
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- "hostname": Returns the server's hostname
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@ -112,6 +122,7 @@ func init() {
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"File containing an x509 private key matching --tls-cert-file")
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CmdNetexec.Flags().IntVar(&udpPort, "udp-port", 8081, "UDP Listen Port")
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CmdNetexec.Flags().IntVar(&sctpPort, "sctp-port", -1, "SCTP Listen Port")
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CmdNetexec.Flags().StringVar(&httpOverride, "http-override", "", "Override the HTTP handler to always respond as if it were a GET with this path & params")
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}
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// atomicBool uses load/store operations on an int32 to simulate an atomic boolean.
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@ -135,7 +146,21 @@ func (a *atomicBool) get() bool {
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func main(cmd *cobra.Command, args []string) {
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exitCh := make(chan shutdownRequest)
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addRoutes(exitCh)
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if httpOverride != "" {
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mux := http.NewServeMux()
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addRoutes(mux, exitCh)
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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overrideReq, err := http.NewRequestWithContext(r.Context(), "GET", httpOverride, nil)
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if err != nil {
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http.Error(w, fmt.Sprintf("override request failed: %v", err), http.StatusInternalServerError)
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return
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}
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mux.ServeHTTP(w, overrideReq)
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})
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} else {
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addRoutes(http.DefaultServeMux, exitCh)
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}
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go startUDPServer(udpPort)
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if sctpPort != -1 {
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@ -150,22 +175,24 @@ func main(cmd *cobra.Command, args []string) {
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}
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}
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func addRoutes(exitCh chan shutdownRequest) {
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http.HandleFunc("/", rootHandler)
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http.HandleFunc("/clientip", clientIPHandler)
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http.HandleFunc("/echo", echoHandler)
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http.HandleFunc("/exit", func(w http.ResponseWriter, req *http.Request) { exitHandler(w, req, exitCh) })
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http.HandleFunc("/hostname", hostnameHandler)
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http.HandleFunc("/shell", shellHandler)
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http.HandleFunc("/upload", uploadHandler)
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http.HandleFunc("/dial", dialHandler)
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http.HandleFunc("/healthz", healthzHandler)
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func addRoutes(mux *http.ServeMux, exitCh chan shutdownRequest) {
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mux.HandleFunc("/", rootHandler)
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mux.HandleFunc("/clientip", clientIPHandler)
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mux.HandleFunc("/dial", dialHandler)
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mux.HandleFunc("/echo", echoHandler)
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mux.HandleFunc("/exit", func(w http.ResponseWriter, req *http.Request) { exitHandler(w, req, exitCh) })
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mux.HandleFunc("/healthz", healthzHandler)
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mux.HandleFunc("/hostname", hostnameHandler)
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mux.HandleFunc("/redirect", redirectHandler)
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mux.HandleFunc("/shell", shellHandler)
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mux.HandleFunc("/upload", uploadHandler)
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// older handlers
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http.HandleFunc("/hostName", hostNameHandler)
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http.HandleFunc("/shutdown", shutdownHandler)
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mux.HandleFunc("/hostName", hostNameHandler)
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mux.HandleFunc("/shutdown", shutdownHandler)
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}
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func startServer(server *http.Server, exitCh chan shutdownRequest, fn func() error) {
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log.Printf("Started HTTP server on port %d", httpPort)
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go func() {
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re := <-exitCh
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ctx, cancelFn := context.WithTimeout(context.Background(), re.timeout)
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@ -190,8 +217,18 @@ func rootHandler(w http.ResponseWriter, r *http.Request) {
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}
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func echoHandler(w http.ResponseWriter, r *http.Request) {
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log.Printf("GET /echo?msg=%s", r.FormValue("msg"))
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fmt.Fprintf(w, "%s", r.FormValue("msg"))
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msg := r.FormValue("msg")
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codeString := r.FormValue("code")
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log.Printf("GET /echo?msg=%s&code=%s", msg, codeString)
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if codeString != "" {
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code, err := strconv.Atoi(codeString)
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if err != nil && codeString != "" {
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fmt.Fprintf(w, "argument 'code' must be an integer or empty, got %q\n", codeString)
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return
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}
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w.WriteHeader(code)
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}
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fmt.Fprintf(w, "%s", msg)
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}
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func clientIPHandler(w http.ResponseWriter, r *http.Request) {
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@ -488,6 +525,22 @@ func hostNameHandler(w http.ResponseWriter, r *http.Request) {
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fmt.Fprint(w, getHostName())
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}
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func redirectHandler(w http.ResponseWriter, r *http.Request) {
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location := r.FormValue("location")
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codeString := r.FormValue("code")
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log.Printf("%s /redirect?msg=%s&code=%s", r.Method, location, codeString)
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code := http.StatusFound
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if codeString != "" {
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var err error
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code, err = strconv.Atoi(codeString)
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if err != nil && codeString != "" {
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fmt.Fprintf(w, "argument 'code' must be an integer or empty, got %q\n", codeString)
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return
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}
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}
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http.Redirect(w, r, location, code)
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}
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// udp server supports the hostName, echo and clientIP commands.
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func startUDPServer(udpPort int) {
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serverAddress, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%d", udpPort))
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@ -497,7 +550,7 @@ func startUDPServer(udpPort int) {
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defer serverConn.Close()
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buf := make([]byte, 2048)
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log.Printf("Started UDP server")
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log.Printf("Started UDP server on port %d", udpPort)
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// Start responding to readiness probes.
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serverReady.set(true)
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defer func() {
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