Failed SSHD Login Attempts (15,000 per day) - Is that a lot compared to your server? Post: 303039259

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Special Forums Cybersecurity Failed SSHD Login Attempts (15,000 per day) - Is that a lot compared to your server? Post 303039259 by stomp on Friday 27th of September 2019 10:45:52 AM

09-27-2019

Registered User

@Neo: Thanks for rephrasing and clarifying your request!

Here's a script which calculates the FLAPM value:

Code:

#!/bin/bash

exit_with_message() { echo "$*" ; exit 1 ;}

type lastb >/dev/null 2>&1  || exit_with_message "error: no lastb"
type awk   >/dev/null 2>&1  || exit_with_message "error: no awk"

evaluate() {
   awk '

        function epoch(date,d) { "date -d \""date"\" +%s" | getline d; return d; }

        $10 != ""       { mydate=$4" "$5" "$6" "$7;count++; }
        NR==1           { last=epoch(mydate); }

        END { printf "%9.4f FLAPM\n",count/((last-epoch(mydate))/60)}
        '
}

lastb | evaluate

Here are some results for servers I manage, which provide services within the internet, partly with fail2ban and changed ssh ports in place:

Code:

  0.07 FLAPM
  0.07 FLAPM
  0.10 FLAPM
  0.10 FLAPM
  0.10 FLAPM
  0.11 FLAPM
  0.11 FLAPM
  0.11 FLAPM
  0.12 FLAPM
  0.20 FLAPM
  0.88 FLAPM
  1.12 FLAPM
  1.27 FLAPM
  1.36 FLAPM
  1.61 FLAPM
  1.74 FLAPM
  1.79 FLAPM
  1.92 FLAPM
  1.94 FLAPM
  2.88 FLAPM
  2.95 FLAPM
  3.20 FLAPM
  3.22 FLAPM
  3.35 FLAPM
  3.51 FLAPM
  3.53 FLAPM
  3.62 FLAPM
  3.63 FLAPM
  4.12 FLAPM
  4.75 FLAPM
  4.78 FLAPM
  4.82 FLAPM
  4.92 FLAPM
  4.96 FLAPM
  4.99 FLAPM
  5.07 FLAPM
  5.29 FLAPM
  5.29 FLAPM
  5.35 FLAPM
  5.44 FLAPM
  5.46 FLAPM
  5.54 FLAPM
  5.56 FLAPM
  5.62 FLAPM
  5.79 FLAPM
  5.80 FLAPM
  5.82 FLAPM
  5.85 FLAPM
  5.86 FLAPM
  5.86 FLAPM
  5.91 FLAPM
  6.01 FLAPM
  6.04 FLAPM
  6.25 FLAPM
  6.34 FLAPM
  6.92 FLAPM
  7.54 FLAPM
  8.72 FLAPM
  9.20 FLAPM
 11.01 FLAPM
 11.93 FLAPM
 12.57 FLAPM
 12.90 FLAPM
 13.08 FLAPM
 13.09 FLAPM
 13.35 FLAPM
 13.52 FLAPM
 14.09 FLAPM
 14.58 FLAPM
 14.76 FLAPM
 14.78 FLAPM
 14.80 FLAPM
 15.18 FLAPM
 16.97 FLAPM
 17.18 FLAPM
 17.22 FLAPM
 20.70 FLAPM
 23.57 FLAPM
 40.46 FLAPM

Last edited by stomp; 09-27-2019 at 11:51 AM..

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tcl_gettime

Tcl_GetTime(3)						      Tcl Library Procedures						    Tcl_GetTime(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_GetTime - get date and time

SYNOPSIS

       #include <tcl.h>

       Tcl_GetTime( timePtr )

ARGUMENTS

       Tcl_Time *   timePtr   (out)	Points to memory in which to store the date and time information.
_________________________________________________________________

DESCRIPTION

       The  Tcl_GetTime function retrieves the current time as a Tcl_Time structure in memory the caller provides.  This structure has the follow-
       ing definition:
	      typedef struct Tcl_Time {
		  long sec;
		  long usec;
	      } Tcl_Time;

       On return, the sec member of the structure is filled in with the number of seconds that have elapsed since the  epoch:  the  epoch  is  the
       point  in time of 00:00 UTC, 1 January 1970.  This number does not count leap seconds - an interval of one day advances it by 86400 seconds
       regardless of whether a leap second has been inserted.

       The usec member of the structure is filled in with the number of microseconds that have elapsed since the start of the second designated by
       sec.  The Tcl library makes every effort to keep this number as precise as possible, subject to the limitations of the computer system.	On
       multiprocessor variants of Windows, this number may be limited to the 10- or 20-ms granularity of the system clock.   (On  single-processor
       Windows systems, the usec field is derived from a performance counter and is highly precise.)

SEE ALSO

       clock

KEYWORDS

       date, time

Tcl									8.4							    Tcl_GetTime(3)