Getciphersuite function in client handler

client_handler.go

@@ -2,6 +2,7 @@ package ftpserver
 
 import (
 	"bufio"
+	"crypto/tls"
 	"errors"
 	"fmt"
 	"io"
@@ -51,6 +52,7 @@ var (
 	errNoTransferConnection  = errors.New("unable to open transfer: no transfer connection")
 	errTLSRequired           = errors.New("unable to open transfer: TLS is required")
 	errInvalidTLSRequirement = errors.New("invalid TLS requirement")
+	errNonTLSConnection      = errors.New("GetTLSCiphersuite called on a nonTLS connection")
 )
 
 func getHashMapping() map[string]HASHAlgo {
@@ -259,6 +261,16 @@ func (c *clientHandler) HasTLSForTransfers() bool {
 	return c.transferTLS
 }
 
+func (c *clientHandler) GetTLSCipherSuite() (uint16, error) {
+	conn := c.conn
+	tlsConn, ok := conn.(*tls.Conn)
+	if !ok {
+		return 0, errNonTLSConnection
+	}
+
+	return tlsConn.ConnectionState().CipherSuite, nil
+}
+
 func (c *clientHandler) SetExtra(extra any) {
 	c.extra = extra
 }

driver.go

@@ -188,6 +188,9 @@ type ClientContext interface {
 	// HasTLSForTransfers returns true if the transfer connection is over TLS
 	HasTLSForTransfers() bool
 
+	// GetTlSCipherSuite returns ID
+	GetTLSCipherSuite() (uint16, error)
+
 	// GetLastCommand returns the last received command
 	GetLastCommand() string