On 01/05/2017 10:14 AM, Aline Manera wrote:
Hi Ramon,

On 12/22/2016 01:59 PM, Ramon Medeiros wrote:

Propose: make adjustments at login page to make difficult brute force attack.

Today, an intruder can make login tries without any action from Wok.

Possible measures:

Record source port and ip. After 3 tries, block user for 30 seconds and increase the time by each more try. Using source port and ip will avoid errors for connections from NAT networks.

Example:

1) ip 192.168.1.1 tries to login as root 3 times and fail


You will consider ip and port, right? So when ip and port tries to login as root 3 times and fail...

yep

2) A timeout of 30 seconds will be set


Does that mean the user will not be allowed to perform a login action for 30 seconds?

yep. based on ip and port

3) After that, for 5 minutes, each try will add 30 seconds + x times the trial (60 seconds, 90 seconds. ..)


Not sure I got what you want here. After the 30 seconds block, the user will be able to try to login again.
How many attempts he/she can try to login again before get blocked?

Will he/she get blocked for 5 minutes in the second round of attempts?


I was thinking about this:

1st try -> denied
2nd try -> denied
3rd try -> denied

30s timeout

After this 30s, other timeout will be added, letting user try just 1 time. If the mismatch continues, more time will be added. Let me explain:

5 minutes window:

4th try -> denied

Then we will add a new timeout block, but greater (60s)

After 60s timeout:

5th try -> denied

New timeout 90s


So, after received a 30s timeout, the user will be 5 minutes sensible to the algorithm.  Let me know if it was clear




4) After 5 minutes of the last try, the counter will be reset.

-- 

Ramon Nunes Medeiros
Kimchi Developer
Linux Technology Center Brazil
IBM Systems & Technology Group
Phone : +55 19 2132 7878
ramonn@br.ibm.com 


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-- 

Ramon Nunes Medeiros
Kimchi Developer
Linux Technology Center Brazil
IBM Systems & Technology Group
Phone : +55 19 2132 7878
ramonn@br.ibm.com