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Security fail2ban for Centmin Mod + CSF Firewall / Cloudflare API

Discussion in 'System Administration' started by eva2000, May 12, 2017.

  1. pamamolf

    pamamolf Premium Member Premium Member

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    Code:
    017-08-21 19:18:13,187 fail2ban.failmanager    [14513]: DEBUG   Total # of detected failures: 1604. Current failures from 1 IPs (IP:count): remoteserverip:1
    2017-08-21 19:18:13,187 fail2ban.filter         [14513]: DEBUG   Processing line with time:1503343093.0 and ip:remoteserverip
    2017-08-21 19:18:13,188 fail2ban.filter         [14513]: INFO    [nginx-req-limit] Found remoteserverip - 2017-08-21 19:18:13
    2017-08-21 19:18:13,191 fail2ban.failmanager    [14513]: DEBUG   Total # of detected failures: 1605. Current failures from 1 IPs (IP:count): remoteserverip:2
    2017-08-21 19:18:13,415 fail2ban.actions        [14513]: DEBUG   [nginx-req-limit] remoteserverip already banned
    2017-08-21 19:18:13,415 fail2ban.actions        [14513]: DEBUG   [nginx-req-limit] remoteserverip already banned
    2017-08-21 19:18:13,416 fail2ban.actions        [14513]: DEBUG   [nginx-req-limit] remoteserverip already banned
    2017-08-21 19:18:13,417 fail2ban.actions        [14513]: NOTICE  [nginx-req-limit] remoteserverip already banned
    2017-08-21 19:18:13,418 fail2ban.actions        [14513]: NOTICE  [nginx-req-limit] remoteserverip already banned
    Log seems to be ok but again nothing with Cloudflare :)
     
    Last edited: Aug 22, 2017
  2. pamamolf

    pamamolf Premium Member Premium Member

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    Maybe something related in the code with a variable like $ip as if i use direct ip it works .....?

    Or maybe a local fix that you forgot to push to Github ? :whistle:
     
  3. eva2000

    eva2000 Administrator Staff Member

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    manual ssh related only the fail2ban cloudflare action is correct and works

    debug log should also list an action for the ban

    i.e. with csf firewall default
    Code (Text):
    2017-08-21 15:02:11,264 fail2ban.actions        [2351]: NOTICE  [nginx-req-limit] Ban 149.xxx.xxx.xxx
    2017-08-21 15:02:11,264 fail2ban.action         [2351]: DEBUG   csf -d 149.xxx.xxx.xxx Added by Fail2Ban for nginx-req-limit

    you should have such an action for cloudflare
     
  4. pamamolf

    pamamolf Premium Member Premium Member

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    This is what i have with Cloudflare enable:

    Code:
    2017-08-22 04:50:06,793 fail2ban.filter         [14513]: INFO    [nginx-req-limit] Found remoteserverip - 2017-08-22 04:50:06
    2017-08-22 04:50:06,796 fail2ban.actions        [14513]: NOTICE  [nginx-req-limit] Ban remoteserverip
    2017-08-22 04:50:06,810 fail2ban.filter         [14513]: INFO    [nginx-req-limit-repeat] Found remoteserverip - 2017-08-22 04:50:06
    2017-08-22 04:50:06,826 fail2ban.filter         [14513]: INFO    [nginx-req-limit] Found remoteserverip - 2017-08-22 04:50:06
    2017-08-22 04:50:06,827 fail2ban.filter         [14513]: INFO    [nginx-req-limit] Found remoteserverip - 2017-08-22 04:50:06
    With the csf firewall as default action i have the same output as yours and it works....

    The only issue is with the Cloudflare as default action ......

    As you can see from the log it does ban the ip but not push correctly to Cloudflare....

    But as i can push manually an access rule with no problems on Cloudflare i thought that the issue may be in the code maybe ....

    Thank you !!!
     
  5. eva2000

    eva2000 Administrator Staff Member

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    definitely ain't the fail2ban action code as it works for me though so not sure why it isn't working for you

    make sure you enable debug loglevel so can see debug info too
     
  6. pamamolf

    pamamolf Premium Member Premium Member

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    Yes i am using debug log level .....

    I just notice also that the Cloudflare firewall block the server for browser user agent siege as not valid.....

    At firewall events ....

    Ok anyway i will reinstall the vps and try again.....

    Wondering if the limit of 200 rules for free plan is related to firewall events or for access rules or both combined ......

    But it should be for Access Rules only !
     
    Last edited: Aug 22, 2017
  7. pamamolf

    pamamolf Premium Member Premium Member

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    Ok i just get 2 new vps's one for main server and one for attack.....

    I follow the instructions and now i can see on fail2ban log:

    Code:
    2017-08-22 09:39:01,695 fail2ban.filterpyinotify[10217]: DEBUG   <_RawEvent cookie=0 mask=0x2 name='' wd=2 >
    2017-08-22 09:39:01,696 fail2ban.filterpyinotify[10217]: DEBUG   Event queue size: 16
    2017-08-22 09:39:01,697 fail2ban.filterpyinotify[10217]: DEBUG   <_RawEvent cookie=0 mask=0x2 name='' wd=2 >
    2017-08-22 09:39:01,697 fail2ban.filterpyinotify[10217]: DEBUG   Event queue size: 16
    2017-08-22 09:39:01,697 fail2ban.filterpyinotify[10217]: DEBUG   <_RawEvent cookie=0 mask=0x2 name='' wd=2 >

    But it seems that the ip is banned:

    Code:
    Status for the jail: nginx-req-limit
    |- Filter
    |  |- Currently failed: 0
    |  |- Total failed:     536
    |  `- File list:        /home/nginx/domains/testdomain.com/log/error.log
    `- Actions
       |- Currently banned: 1
       |- Total banned:     1
       `- Banned IP list:   remoteserveriphere

    Code:
    fail2ban-regex error.log /etc/fail2ban/filter.d/nginx-req-limit.conf
    
    Running tests
    =============
    
    Use   failregex filter file : nginx-req-limit, basedir: /etc/fail2ban
    Use      datepattern : Default Detectors
    Use         log file : error.log
    Use         encoding : UTF-8
    
    
    Results
    =======
    
    Failregex: 536 total
    |-  #) [# of hits] regular expression
    |   1) [536] ^\s*\[error\] \d+#\d+: \*\d+ limiting requests, excess: [\d\.]+ by zone "(?:[^"]+)", client: <HOST>,
    `-
    
    Ignoreregex: 0 total
    
    Date template hits:
    |- [# of hits] date format
    |  [536] {^LN-BEG}ExYear(?P<_sep>[-/.])Month(?P=_sep)Day[T ]24hour:Minute:Second(?:[.,]Microseconds)?(?:\s*Zone offset)?
    `-
    
    Lines: 536 lines, 0 ignored, 536 matched, 0 missed
    All looks ok but no Cloudflare entry at all :(

    I know that it works for you but i am sure that other users also may have issues with it as i did a fresh install and follow exactly the how to.....

    I can provide you if you want server access for both test servers so you can check...

    If there is a bug or an issue somewhere other users may benefit from this....

    Thank you

    At the moment i will have to use the csf action as it works perfect and i will manually add them to Cloudflare :(
     
    Last edited: Aug 22, 2017
  8. pamamolf

    pamamolf Premium Member Premium Member

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    Ok so i start testing the csfdeny action :)

    It works great and i got a ban when needed but i can't clear my ip for ever :(

    What i do is clear all logs access and error logs and then remove my ip from csfdeny file and then restart the csf and then i restart also the fail2ban and boom i am banned again when fail2ban started :(

    Don't know where fail2ban store that previous info and use them after restarting it :(

    Any help so i can go ahead with tests?

    I also edit the:

    Code:
    /etc/fail2ban/fail2ban.conf
    and set dbpurgeage = to 10 so after 10 seconds it should clear the banned ip's but nothing :(

    Also the default value is:

    Code:
    # Values: [ SECONDS ] Default: 86400 (24hours)
    dbpurgeage = 1d
    but it should be at seconds?
     
    Last edited: Aug 23, 2017
  9. pamamolf

    pamamolf Premium Member Premium Member

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    Ok i did ot using the hard way :(

    Stop fail2ban

    then run:

    Code:
    mv /var/lib/fail2ban/fail2ban.sqlite3 /var/lib/fail2ban/fail2ban.olda
    and then start fail2ban ....

    That works but don't know why dbpurgeage = 10 doesn't work :(
     
  10. pamamolf

    pamamolf Premium Member Premium Member

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    I note also that nginx-get-f5 is commented (disable) at jails and i rename also the related config file from .conf to .old and then i restart fail2ban and try to scan using Acunetix and i got a ban and at the csf deny entry there is:

    Code:
    # Added by Fail2Ban for nginx-get-f5 - Wed Aug 23 13:02:55 2017

    Also that seems a nice code that you may want to add on your script for an easy way to delete all banned ip's?

    fail2ban-remove-ban/fail2ban-remove-ban.sh at master · extremeshok/fail2ban-remove-ban · GitHub
     
  11. eva2000

    eva2000 Administrator Staff Member

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    how were you unbanning your fail2ban triggered ip bans previously ? using official fail2ban documented method ?

    fail2ban config is jail.local not ending in .conf, you should you got the right one ?
     
  12. pamamolf

    pamamolf Premium Member Premium Member

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    Just by removing them from csf deny file ...

    Then i read the documentation and it seems the only way to do that is to set the dbpurgeage = 1d to a short value like dbpurgeage = 20 so that should clear all fail2ban banned ip's from the fail2ban.sqlite3 but for me it didn't work :(

    I edit:

    Code:
    nano /etc/fail2ban/jail.local
    and i set there:

    Code:
    #[nginx-get-f5]
    #enabled = true
    #filter = nginx-get-f5
    #action = csfdeny[name=nginx-get-f5]
    ##action   = cloudflare
    #logpath = /home/nginx/domains/*/log/access.log
    #          /usr/local/nginx/logs/*access*.log
    #port   = http,https
    #maxretry = 15
    #findtime = 1
    #bantime = 600
    and i just rename also the:

    Code:
    /root/tools/centminmod-fail2ban/filter.d/nginx-get-f5.conf
    to

    Code:
    /root/tools/centminmod-fail2ban/filter.d/nginx-get-f5.old
     
  13. pamamolf

    pamamolf Premium Member Premium Member

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    I am wondering also if bantime = 600 for example works also and auto remove the ban.... ?

    Anyway i will do more tests next time :)
     
  14. eva2000

    eva2000 Administrator Staff Member

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    they all work for me
    there's part of your problem, you need to use proper method for unbanning ips banned via fail2ban from GitHub - centminmod/centminmod-fail2ban: fail2ban setup for centminmod.com LEMP stack with CSF Firewall
     
  15. pamamolf

    pamamolf Premium Member Premium Member

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    I think i do the correct steps.....

    I will ask for help from a freelancer......

    Thanks anyway !!! :)
     
  16. eva2000

    eva2000 Administrator Staff Member

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    Need to read more.. correct steps are in very first 2 Q&As for official troubleshooting fail2ban link ;)
     
  17. pamamolf

    pamamolf Premium Member Premium Member

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    Well it seems that i found what the problem is :)

    Install using:

    Code:
    mkdir -p /root/tools
    cd /root/tools
    git clone https://github.com/centminmod/centminmod-fail2ban
    cd centminmod-fail2ban
    ./fail2ban.sh install
    Then i did some settings at this directory:

    Code:
    /etc/fail2ban/
    and some at:

    Code:
    /root/tools/centminmod-fail2ban/
    George can you please verify that all changes must be done at this directory?

    Code:
    /etc/fail2ban/
    Thank you
     
  18. eva2000

    eva2000 Administrator Staff Member

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    nothing from memory requires running from /root/tools/centminmod-fail2ban/ but that's what i do

    where are you running it from previously for fail2ban.sh ?
     
  19. pamamolf

    pamamolf Premium Member Premium Member

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    Well as i reinstall the server the only installation was done from /root/tools/centminmod-fail2ban/ but don't know why i did the mistake and i was trying to edit filters there and the cloudflare config file also :(

    Now that i did the changes at the correct path /etc/fail2ban/ all working perfect !!!!!

    Now i am thinking of a good value for the nginx get f5 ....

    Code:
    #maxretry = 15
    #findtime = 1
    #bantime = 600
    Does that mean if a user request / of the site (main page) by hitting the F5 (don't have any idea how the system will now that the request will be from F5 ) more than 15 times then is banned?

    Thank you !!!!!
     
  20. eva2000

    eva2000 Administrator Staff Member

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    oh you edited git repo's filter/conf at /root/tools/centminmod-fail2ban ! yup mistake, proper ones are in /etc/fail2ban :D

    yes =>15 hits = ban