107 lines
3.0 KiB
Go
107 lines
3.0 KiB
Go
// Package telnet provides a zgrab2 module that scans for telnet daemons.
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// Default Port: 23 (TCP)
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//
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// The --max-read-size flag allows setting a ceiling to the number of bytes
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// that will be read for the banner.
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//
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// The scan negotiates the options and attempts to grab the banner, using the
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// same behavior as the original zgrab.
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//
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// The output contains the banner and the negotiated options, in the same
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// format as the original zgrab.
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package telnet
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import (
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log "github.com/sirupsen/logrus"
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"github.com/zmap/zgrab2"
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)
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// Flags holds the command-line configuration for the Telnet scan module.
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// Populated by the framework.
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type Flags struct {
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zgrab2.BaseFlags
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MaxReadSize int `long:"max-read-size" description:"Set the maximum number of bytes to read when grabbing the banner" default:"65536"`
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Verbose bool `long:"verbose" description:"More verbose logging, include debug fields in the scan results"`
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}
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// Module implements the zgrab2.Module interface.
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type Module struct {
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}
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// Scanner implements the zgrab2.Scanner interface.
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type Scanner struct {
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config *Flags
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}
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// RegisterModule registers the zgrab2 module.
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func RegisterModule() {
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var module Module
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_, err := zgrab2.AddCommand("telnet", "telnet", "Probe for telnet", 23, &module)
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if err != nil {
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log.Fatal(err)
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}
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}
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// NewFlags returns a default Flags object.
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func (module *Module) NewFlags() interface{} {
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return new(Flags)
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}
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// NewScanner returns a new Scanner instance.
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func (module *Module) NewScanner() zgrab2.Scanner {
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return new(Scanner)
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}
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// Validate checks that the flags are valid.
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// On success, returns nil.
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// On failure, returns an error instance describing the error.
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func (flags *Flags) Validate(args []string) error {
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return nil
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}
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// Help returns the module's help string.
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func (flags *Flags) Help() string {
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return ""
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}
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// Init initializes the Scanner.
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func (scanner *Scanner) Init(flags zgrab2.ScanFlags) error {
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f, _ := flags.(*Flags)
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scanner.config = f
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return nil
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}
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// InitPerSender initializes the scanner for a given sender.
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func (scanner *Scanner) InitPerSender(senderID int) error {
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return nil
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}
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// GetName returns the Scanner name defined in the Flags.
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func (scanner *Scanner) GetName() string {
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return scanner.config.Name
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}
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// GetTrigger returns the Trigger defined in the Flags.
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func (scanner *Scanner) GetTrigger() string {
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return scanner.config.Trigger
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}
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// Protocol returns the protocol identifier of the scan.
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func (scanner *Scanner) Protocol() string {
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return "telnet"
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}
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// Scan connects to the target (default port TCP 23) and attempts to grab the Telnet banner.
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func (scanner *Scanner) Scan(target zgrab2.ScanTarget) (zgrab2.ScanStatus, interface{}, error) {
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conn, err := target.Open(&scanner.config.BaseFlags)
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if err != nil {
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return zgrab2.TryGetScanStatus(err), nil, err
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}
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defer conn.Close()
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result := new(TelnetLog)
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if err := GetTelnetBanner(result, conn, scanner.config.MaxReadSize); err != nil {
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return zgrab2.TryGetScanStatus(err), result.getResult(), err
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}
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return zgrab2.SCAN_SUCCESS, result, nil
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}
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