README.md

@@ -66,7 +66,7 @@ See the [serial](https://gitea.elara.ws/Elara6331/seashell/wiki/Backends#serial)
 
 Seashell can proxy another SSH server. In this case, your client will authenticate to seashell and then seashell will authenticate to the target server, so you should provide seashell with a private key to use for authentication and encryption. If you don't provide this, seashell will ask the authenticating user for the target server's password.
 
-Here's an example command:
+The proxy backend takes no extra arguments, so the `ssh` command only requires your username and the routing path:
 
 ```bash
 ssh user:myproxy@ssh.example.com

internal/backends/proxy.go

@@ -27,8 +27,6 @@ import (
 	"io"
 	"net"
 	"os"
-	"path"
-	"strconv"
 	"strings"
 
 	"github.com/gliderlabs/ssh"
@@ -43,8 +41,8 @@ import (
 
 // proxySettings represents settings for the proxy backend.
 type proxySettings struct {
-	Host        *string    `cty:"host"`
-	Hosts       *cty.Value `cty:"hosts"`
+	Server      string     `cty:"server"`
+	Port        *uint       `cty:"port"`
 	User        *string    `cty:"user"`
 	PrivkeyPath *string    `cty:"privkey"`
 	UserMap     *cty.Value `cty:"user_map"`
@@ -55,6 +53,9 @@ type proxySettings struct {
 func Proxy(route config.Route) router.Handler {
 	return func(sess ssh.Session, arg string) error {
 		user, _ := sshctx.GetUser(sess.Context())
+		if !route.Permissions.IsAllowed(user, "*") {
+			return router.ErrUnauthorized
+		}
 
 		var opts proxySettings
 		err := gocty.FromCtyValue(route.Settings, &opts)
@@ -77,56 +78,14 @@ func Proxy(route config.Route) router.Handler {
 				opts.User = &user.Name
 			}
 		}
-
-		matched := false
-		addr := arg
-		var portstr, pattern string
-		if opts.Host == nil {
-			hosts := ctyTupleToStrings(opts.Hosts)
-			if len(hosts) == 0 {
-				return errors.New("no host configuration provided")
-			}
-
-			for _, hostPattern := range hosts {
-				pattern, portstr, ok = strings.Cut(hostPattern, ":")
-				if !ok {
-					// addr is already set by the above statement, so just set the default port
-					portstr = "22"
-				}
-
-				matched, err = path.Match(pattern, arg)
-				if err != nil {
-					return err
-				}
-
-				if matched {
-					addr = arg
-					break
-				}
-			}
-		} else {
-			addr, portstr, ok = strings.Cut(*opts.Host, ":")
-			if !ok {
-				// addr is already set by the above statement, so just set the default port
-				portstr = "22"
-			}
-		}
-
-		if !route.Permissions.IsAllowed(user, addr) {
-			return router.ErrUnauthorized
-		}
-
-		if !matched {
-			return errors.New("provided argument doesn't match any host patterns in configuration")
-		}
-
-		port, err := strconv.ParseUint(portstr, 10, 16)
-		if err != nil {
-			return err
+		
+		if opts.Port == nil {
+			port := uint(22)
+			opts.Port = &port
 		}
 
 		auth := goph.Auth{
-			gossh.PasswordCallback(requestPassword(opts, sess, addr)),
+			gossh.PasswordCallback(requestPassword(opts, sess)),
 		}
 
 		if opts.PrivkeyPath != nil {
@@ -146,8 +105,8 @@ func Proxy(route config.Route) router.Handler {
 		c, err := goph.NewConn(&goph.Config{
 			Auth: auth,
 			User: *opts.User,
-			Addr: addr,
-			Port: uint(port),
+			Addr: opts.Server,
+			Port: *opts.Port,
 			Callback: func(host string, remote net.Addr, key gossh.PublicKey) error {
 				found, err := goph.CheckKnownHost(host, remote, key, "")
 				if !found {
@@ -214,9 +173,9 @@ func Proxy(route config.Route) router.Handler {
 }
 
 // requestPassword asks the client for the remote server's password
-func requestPassword(opts proxySettings, sess ssh.Session, addr string) func() (secret string, err error) {
+func requestPassword(opts proxySettings, sess ssh.Session) func() (secret string, err error) {
 	return func() (secret string, err error) {
-		_, err = fmt.Fprintf(sess.Stderr(), "Password for %s@%s: ", *opts.User, addr)
+		_, err = fmt.Fprintf(sess.Stderr(), "Password for %s@%s: ", *opts.User, opts.Server)
 		if err != nil {
 			return "", err
 		}

seashell.ex.hcl

@@ -20,16 +20,7 @@ route "srv" {
     backend = "proxy"
     match = "srv"
     settings = {
-        host = "1.2.3.4"
-        privkey = "/home/elara/.ssh/id_ed25519"
-    }
-}
-
-route "cluster" {
-    backend = "proxy"
-    match = "cluster\\.(.+)"
-    settings = {
-        hosts = ["node*", "nas", "192.168.1.*"]
+        server = "1.2.3.4"
         privkey = "/home/elara/.ssh/id_ed25519"
     }
 }