RDODCP-1692: log refused outbound connections at info level

README.md

@@ -546,6 +546,7 @@ Since WebSockets support is required:
   - client exits non-zero when `--max-retry-count` is exhausted; new `--min-retry-interval` (default 1s); `socks5://` accepted for `--proxy`
   - `go install` builds report their real version; sessions and failed logins are logged at info level
   - new `--disable-forward` server flag refuses connections through forward (non-reverse) remotes; this flag is specific to this fork and is not in upstream
+  - refused outbound connections are logged at info level with the requested target (`Denied outbound connection to "<host:port>"`)
   - releases now ship goreleaser-built multi-arch Docker images to GHCR and Docker Hub with correctly stamped versions; releasing is two-stage — tagging builds a draft GitHub release plus version-tagged images, and publishing the draft promotes the Docker `latest` / `X` / `X.Y` tags
 
 ### Upgrading to 1.12

share/tunnel/tunnel_out_ssh.go

@@ -34,7 +34,8 @@ func (t *Tunnel) handleSSHChannels(ctx context.Context, chans <-chan ssh.NewChan
 
 func (t *Tunnel) handleSSHChannel(ctx context.Context, ch ssh.NewChannel) {
 	if !t.Config.Outbound {
-		t.Debugf("Denied outbound connection")
+		//info-level so refusals are visible without -v; the target is client-controlled, so quote it
+		t.Infof("Denied outbound connection to %q", string(ch.ExtraData()))
 		ch.Reject(ssh.Prohibited, "Denied outbound connection")
 		return
 	}

share/tunnel/tunnel_out_ssh_test.go

@@ -0,0 +1,46 @@
+package tunnel
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/jpillora/chisel/share/cio"
+	"golang.org/x/crypto/ssh"
+)
+
+type rejectedChannel struct {
+	extra   string
+	reason  ssh.RejectionReason
+	message string
+}
+
+func (c *rejectedChannel) Accept() (ssh.Channel, <-chan *ssh.Request, error) {
+	panic("channel should not be accepted")
+}
+
+func (c *rejectedChannel) Reject(reason ssh.RejectionReason, message string) error {
+	c.reason, c.message = reason, message
+	return nil
+}
+
+func (c *rejectedChannel) ChannelType() string { return "chisel" }
+func (c *rejectedChannel) ExtraData() []byte   { return []byte(c.extra) }
+
+func TestDeniedOutboundConnectionLoggedAtInfo(t *testing.T) {
+	var logs bytes.Buffer
+	logger := cio.NewLoggerFlag("server", 0)
+	logger.Info = true
+	logger.SetOutput(&logs)
+	tun := &Tunnel{Config: Config{Logger: logger, Outbound: false}}
+
+	ch := &rejectedChannel{extra: "example.com:80\nserver: forged"}
+	tun.handleSSHChannel(nil, ch)
+
+	if ch.reason != ssh.Prohibited || ch.message != "Denied outbound connection" {
+		t.Fatalf("unexpected rejection: %v %q", ch.reason, ch.message)
+	}
+	const want = "server: Denied outbound connection to \"example.com:80\\nserver: forged\"\n"
+	if got := logs.String(); got != want {
+		t.Fatalf("unexpected log:\n got: %q\nwant: %q", got, want)
+	}
+}