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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| package flaghandlerservice | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "log" | ||
| "net" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/sdslabs/katana/configs" | ||
| "github.com/sdslabs/katana/lib/mongo" | ||
| "github.com/sdslabs/katana/lib/utils" | ||
| "github.com/sdslabs/katana/types" | ||
| ) | ||
|
|
||
| type Team struct { | ||
| TeamName string | ||
| TeamID int | ||
| } | ||
|
|
||
| func server() { | ||
| ln, err := net.Listen(configs.FlagConfig.SubmissionServicePort, "tcp") | ||
| if err != nil { | ||
| log.Fatal("Failed to Start Flag Submission Service") | ||
| } | ||
| defer ln.Close() | ||
| log.Println("Flag Submission Service Started at port", configs.FlagConfig.SubmissionServicePort) | ||
| connectedTeam := Team{} | ||
|
|
||
| for { | ||
| conn, err := ln.Accept() | ||
| if err != nil { | ||
| fmt.Println(err) | ||
| if err := conn.Close(); err != nil { | ||
| log.Println("Failed to close", err) | ||
| } | ||
| continue | ||
| } | ||
|
|
||
| log.Println("Connected to", conn.RemoteAddr()) | ||
| go handleConnection(conn, connectedTeam) | ||
| } | ||
| } | ||
|
|
||
| func handleConnection(conn net.Conn, connectedTeam Team) { | ||
| defer func() { | ||
| if err := conn.Close(); err != nil { | ||
| log.Println("Error Closing", err) | ||
| } | ||
| }() | ||
| writeToCient(conn, "Connected to Flag Submission Service\nInitiate your session by `init <teamName> <password>`\n") | ||
|
|
||
| for { | ||
| cmdLine := make([]byte, (1024 * 4)) | ||
| n, err := conn.Read(cmdLine) | ||
|
|
||
| if n == 0 || err != nil { | ||
| log.Println("Connection Read err", err) | ||
| return | ||
| } | ||
|
|
||
| cmd, param, password := parseCommand(string(cmdLine[0:n])) | ||
|
|
||
| if cmd == "" { | ||
| writeToCient(conn, "Inavlid Command\n") | ||
| continue | ||
| } | ||
| switch cmd { | ||
| case "init": | ||
| if param == "" || password == "" { | ||
| writeToCient(conn, "Invalid Login Parameters\n") | ||
| continue | ||
| } else if (Team{}) != connectedTeam { | ||
| writeToCient(conn, "Team is already Logged in\n") | ||
| continue | ||
| } else { | ||
| if checkTeam(param) { | ||
| connectedTeam.TeamAddress = conn.RemoteAddr().String() | ||
| connectedTeam.TeamID = param | ||
| writeToCient(conn, "Team successfully connected,\n Enter flags to submit them\n") | ||
| continue | ||
| } else { | ||
| writeToCient(conn, "Invalid TeamID\n") | ||
| continue | ||
| } | ||
| } | ||
| case "exit": | ||
|
|
||
| default: | ||
| if status, points := submitFlag(cmd); status { | ||
| writeToCient(conn, "Submitted successfully, points:"+strconv.Itoa(points)+"\n") | ||
| } else { | ||
| writeToCient(conn, "Invalid Flag") | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func parseCommand(cmdLine string) (cmd, param, password string) { | ||
| parts := strings.Split(cmdLine, " ") | ||
| if len(parts) == 3 { | ||
| cmd = strings.TrimSpace(parts[0]) | ||
| param = strings.TrimSpace(parts[1]) | ||
| password = strings.TrimSpace(parts[2]) | ||
| return | ||
| } | ||
| if len(parts) == 2 { | ||
| cmd = strings.TrimSpace(parts[0]) | ||
| param = strings.TrimSpace(parts[1]) | ||
| password = "" | ||
| return | ||
| } | ||
| if len(parts) == 1 { | ||
| cmd = strings.TrimSpace(parts[0]) | ||
| param = "" | ||
| password = "" | ||
| return | ||
| } | ||
| return "", "", "" | ||
| } | ||
|
|
||
| func checkTeam(teamName string, password string) (bool, types.CTFTeam) { | ||
| team := &types.CTFTeam{} | ||
| if team, err := mongo.FetchSingleTeam(teamName); err == nil { | ||
| if err = utils.CompareHashWithPassword(team.Password, password); err == nil { | ||
| return true, *team | ||
| } | ||
| } | ||
| return false, *team | ||
| } | ||
| func submitFlag(flag string) (bool, int) { | ||
| return true, 10 | ||
| } | ||
|
|
||
| func writeToCient(conn net.Conn, message string) { | ||
| if _, err := conn.Write([]byte(message)); err != nil { | ||
| log.Println("failed to write", err) | ||
| return | ||
| } | ||
| } |
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