How to block SSH login brute force

By webmaster • 3 years ago • Secure Shell (SSH)

If your SSH server is internet-facing and you've been monitoring the logs, you could probably see constant login attempts to your SSH server from unknown IP addresses. These are primarily from bots that scan the internet and brute-force their way into un-secured SSH servers.

One way to protect your SSH server from this login brute-force is by automatically detecting and blocking these attempts. To start, you can configure the SSH server to manage failed logins using MaxAuthTries and LoginGraceTime options. Then, you can use fail2ban to block offending IP addresses via the firewall after a few failed attempts.

Launch terminal.

Install fail2ban.

$ sudo apt update && sudo apt install --assume-yes fail2ban # Ubuntu and Debian-based distributions

Ensure fail2ban is started during system boot.
```
$ sudo systemctl enable fail2ban
```
Configure fail2ban's SSH options using your preferred text editor (optional).
```
$ sudo vi /etc/fail2ban/jail.conf
```
Restart fail2ban service
```
$ sudo systemctl restart fail2ban 
```

Check fail2ban status.

$ sudo fail2ban-client status sshd Status for the jail: sshd |- Filter |  |- Currently failed:	0 |  |- Total failed:	0 |  `- File list:	/var/log/auth.log `- Actions    |- Currently banned:	0    |- Total banned:	0    `- Banned IP list:

Continue managing fail2ban using fail2ban-client.

$ sudo fail2ban-client --help Usage: fail2ban-client [OPTIONS] <COMMAND>  Fail2Ban v0.11.1 reads log file that contains password failure report and bans the corresponding IP addresses using firewall rules.  Options:     -c <DIR>                configuration directory     -s <FILE>               socket path     -p <FILE>               pidfile path     --loglevel <LEVEL>      logging level     --logtarget <TARGET>    logging target, use file-name or stdout, stderr, syslog or sysout.     --syslogsocket auto|<FILE>     -d                      dump configuration. For debugging     --dp, --dump-pretty     dump the configuration using more human readable representation     -t, --test              test configuration (can be also specified with start parameters)     -i                      interactive mode     -v                      increase verbosity     -q                      decrease verbosity     -x                      force execution of the server (remove socket file)     -b                      start server in background (default)     -f                      start server in foreground     --async                 start server in async mode (for internal usage only, don't read configuration)     --timeout               timeout to wait for the server (for internal usage only, don't read configuration)     --str2sec <STRING>      convert time abbreviation format to seconds     -h, --help              display this help message     -V, --version           print the version (-V returns machine-readable short format)  Command:                                              BASIC     start                                    starts the server and the jails     restart                                  restarts the server     restart [--unban] [--if-exists] <JAIL>   restarts the jail <JAIL> (alias                                              for 'reload --restart ... <JAIL>')     reload [--restart] [--unban] [--all]     reloads the configuration without                                              restarting of the server, the                                              option '--restart' activates                                              completely restarting of affected                                              jails, thereby can unban IP                                              addresses (if option '--unban'                                              specified)     reload [--restart] [--unban] [--if-exists] <JAIL>                                              reloads the jail <JAIL>, or                                              restarts it (if option '--restart'                                              specified)     stop                                     stops all jails and terminate the                                              server     unban --all                              unbans all IP addresses (in all                                              jails and database)     unban <IP> ... <IP>                      unbans <IP> (in all jails and                                              database)     status                                   gets the current status of the                                              server     ping                                     tests if the server is alive     echo                                     for internal usage, returns back                                              and outputs a given string     help                                     return this output     version                                  return the server version                                               LOGGING     set loglevel <LEVEL>                     sets logging level to <LEVEL>.                                              Levels: CRITICAL, ERROR, WARNING,                                              NOTICE, INFO, DEBUG, TRACEDEBUG,                                              HEAVYDEBUG or corresponding                                              numeric value (50-5)     get loglevel                             gets the logging level     set logtarget <TARGET>                   sets logging target to <TARGET>.                                              Can be STDOUT, STDERR, SYSLOG or a                                              file     get logtarget                            gets logging target     set syslogsocket auto|<SOCKET>           sets the syslog socket path to                                              auto or <SOCKET>. Only used if                                              logtarget is SYSLOG     get syslogsocket                         gets syslog socket path     flushlogs                                flushes the logtarget if a file                                              and reopens it. For log rotation.                                               DATABASE     set dbfile <FILE>                        set the location of fail2ban                                              persistent datastore. Set to                                              "None" to disable     get dbfile                               get the location of fail2ban                                              persistent datastore     set dbmaxmatches <INT>                   sets the max number of matches                                              stored in database per ticket     get dbmaxmatches                         gets the max number of matches                                              stored in database per ticket     set dbpurgeage <SECONDS>                 sets the max age in <SECONDS> that                                              history of bans will be kept     get dbpurgeage                           gets the max age in seconds that                                              history of bans will be kept                                               JAIL CONTROL     add <JAIL> <BACKEND>                     creates <JAIL> using <BACKEND>     start <JAIL>                             starts the jail <JAIL>     stop <JAIL>                              stops the jail <JAIL>. The jail is                                              removed     status <JAIL> [FLAVOR]                   gets the current status of <JAIL>,                                              with optional flavor or extended                                              info                                               JAIL CONFIGURATION     set <JAIL> idle on|off                   sets the idle state of <JAIL>     set <JAIL> ignoreself true|false         allows the ignoring of own IP                                              addresses     set <JAIL> addignoreip <IP>              adds <IP> to the ignore list of                                              <JAIL>     set <JAIL> delignoreip <IP>              removes <IP> from the ignore list                                              of <JAIL>     set <JAIL> ignorecommand <VALUE>         sets ignorecommand of <JAIL>     set <JAIL> ignorecache <VALUE>           sets ignorecache of <JAIL>     set <JAIL> addlogpath <FILE> ['tail']    adds <FILE> to the monitoring list                                              of <JAIL>, optionally starting at                                              the 'tail' of the file (default                                              'head').     set <JAIL> dellogpath <FILE>             removes <FILE> from the monitoring                                              list of <JAIL>     set <JAIL> logencoding <ENCODING>        sets the <ENCODING> of the log                                              files for <JAIL>     set <JAIL> addjournalmatch <MATCH>       adds <MATCH> to the journal filter                                              of <JAIL>     set <JAIL> deljournalmatch <MATCH>       removes <MATCH> from the journal                                              filter of <JAIL>     set <JAIL> addfailregex <REGEX>          adds the regular expression                                              <REGEX> which must match failures                                              for <JAIL>     set <JAIL> delfailregex <INDEX>          removes the regular expression at                                              <INDEX> for failregex     set <JAIL> addignoreregex <REGEX>        adds the regular expression                                              <REGEX> which should match pattern                                              to exclude for <JAIL>     set <JAIL> delignoreregex <INDEX>        removes the regular expression at                                              <INDEX> for ignoreregex     set <JAIL> findtime <TIME>               sets the number of seconds <TIME>                                              for which the filter will look                                              back for <JAIL>     set <JAIL> bantime <TIME>                sets the number of seconds <TIME>                                              a host will be banned for <JAIL>     set <JAIL> datepattern <PATTERN>         sets the <PATTERN> used to match                                              date/times for <JAIL>     set <JAIL> usedns <VALUE>                sets the usedns mode for <JAIL>     set <JAIL> attempt <IP> [<failure1> ... <failureN>]                                              manually notify about <IP> failure     set <JAIL> banip <IP> ... <IP>           manually Ban <IP> for <JAIL>     set <JAIL> unbanip [--report-absent] <IP> ... <IP>                                              manually Unban <IP> in <JAIL>     set <JAIL> maxretry <RETRY>              sets the number of failures                                              <RETRY> before banning the host                                              for <JAIL>     set <JAIL> maxmatches <INT>              sets the max number of matches                                              stored in memory per ticket in                                              <JAIL>     set <JAIL> maxlines <LINES>              sets the number of <LINES> to                                              buffer for regex search for <JAIL>     set <JAIL> addaction <ACT>[ <PYTHONFILE> <JSONKWARGS>]                                              adds a new action named <ACT> for                                              <JAIL>. Optionally for a Python                                              based action, a <PYTHONFILE> and                                              <JSONKWARGS> can be specified,                                              else will be a Command Action     set <JAIL> delaction <ACT>               removes the action <ACT> from                                              <JAIL>                                               COMMAND ACTION CONFIGURATION     set <JAIL> action <ACT> actionstart <CMD>                                              sets the start command <CMD> of                                              the action <ACT> for <JAIL>     set <JAIL> action <ACT> actionstop <CMD> sets the stop command <CMD> of the                                              action <ACT> for <JAIL>     set <JAIL> action <ACT> actioncheck <CMD>                                              sets the check command <CMD> of                                              the action <ACT> for <JAIL>     set <JAIL> action <ACT> actionban <CMD>  sets the ban command <CMD> of the                                              action <ACT> for <JAIL>     set <JAIL> action <ACT> actionunban <CMD>                                              sets the unban command <CMD> of                                              the action <ACT> for <JAIL>     set <JAIL> action <ACT> timeout <TIMEOUT>                                              sets <TIMEOUT> as the command                                              timeout in seconds for the action                                              <ACT> for <JAIL>                                               GENERAL ACTION CONFIGURATION     set <JAIL> action <ACT> <PROPERTY> <VALUE>                                              sets the <VALUE> of <PROPERTY> for                                              the action <ACT> for <JAIL>     set <JAIL> action <ACT> <METHOD>[ <JSONKWARGS>]                                              calls the <METHOD> with                                              <JSONKWARGS> for the action <ACT>                                              for <JAIL>                                               JAIL INFORMATION     get <JAIL> logpath                       gets the list of the monitored                                              files for <JAIL>     get <JAIL> logencoding                   gets the encoding of the log files                                              for <JAIL>     get <JAIL> journalmatch                  gets the journal filter match for                                              <JAIL>     get <JAIL> ignoreself                    gets the current value of the                                              ignoring the own IP addresses     get <JAIL> ignoreip                      gets the list of ignored IP                                              addresses for <JAIL>     get <JAIL> ignorecommand                 gets ignorecommand of <JAIL>     get <JAIL> failregex                     gets the list of regular                                              expressions which matches the                                              failures for <JAIL>     get <JAIL> ignoreregex                   gets the list of regular                                              expressions which matches patterns                                              to ignore for <JAIL>     get <JAIL> findtime                      gets the time for which the filter                                              will look back for failures for                                              <JAIL>     get <JAIL> bantime                       gets the time a host is banned for                                              <JAIL>     get <JAIL> datepattern                   gets the patern used to match                                              date/times for <JAIL>     get <JAIL> usedns                        gets the usedns setting for <JAIL>     get <JAIL> banip [<SEP>|--with-time]     gets the list of of banned IP                                              addresses for <JAIL>. Optionally                                              the separator character ('<SEP>',                                              default is space) or the option '                                              --with-time' (printing the times                                              of ban) may be specified. The IPs                                              are ordered by end of ban.     get <JAIL> maxretry                      gets the number of failures                                              allowed for <JAIL>     get <JAIL> maxmatches                    gets the max number of matches                                              stored in memory per ticket in                                              <JAIL>     get <JAIL> maxlines                      gets the number of lines to buffer                                              for <JAIL>     get <JAIL> actions                       gets a list of actions for <JAIL>                                               COMMAND ACTION INFORMATION     get <JAIL> action <ACT> actionstart      gets the start command for the                                              action <ACT> for <JAIL>     get <JAIL> action <ACT> actionstop       gets the stop command for the                                              action <ACT> for <JAIL>     get <JAIL> action <ACT> actioncheck      gets the check command for the                                              action <ACT> for <JAIL>     get <JAIL> action <ACT> actionban        gets the ban command for the                                              action <ACT> for <JAIL>     get <JAIL> action <ACT> actionunban      gets the unban command for the                                              action <ACT> for <JAIL>     get <JAIL> action <ACT> timeout          gets the command timeout in                                              seconds for the action <ACT> for                                              <JAIL>                                               GENERAL ACTION INFORMATION     get <JAIL> actionproperties <ACT>        gets a list of properties for the                                              action <ACT> for <JAIL>     get <JAIL> actionmethods <ACT>           gets a list of methods for the                                              action <ACT> for <JAIL>     get <JAIL> action <ACT> <PROPERTY>       gets the value of <PROPERTY> for                                              the action <ACT> for <JAIL>  Report bugs to https://github.com/fail2ban/fail2ban/issues

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e={cafScriptWasLoaded:this.state.script.loaded,cafScriptLoadTime:this.cafLoadTime,callbacks:this.toCallbacks};return this.error&&(e.js_error={message:this.error}),this.state.script.loaded||(e.zeroclick={reason:"googleAdsFailure"}),e}mockFailedState(){this.state.blocks.transitionTo(State.Failure),this.state.script.transitionTo(State.Failure)}}class TagManager{constructor(e){this.injected=!1,this.identifier=e}inject(){if(this.injected)return;if(!this.identifier)return;if("TEST"===this.identifier)return;const e=document.createElement("script");e.setAttribute("src",`https://www.googletagmanager.com/gtag/js?id=${this.identifier}`),document.head.appendChild(e),this.track(),this.injected=!0}track(){this.push("js",new Date),this.push("config",this.identifier)}push(e,t){window.dataLayer||(window.dataLayer=[]),window.dataLayer.push(arguments)}}const ADS_PARAM="caf",ADS_TRACKING_URL="_tr",BLOCKS_TYPE="ads",BLOCKS_CONTAINER="rs",KNOWN_CAF_PARAMS=["caf","query","afdToken","pcsa","nb","nm","nx","ny","is","clkt"];class Google{static build({pageOptions:e,preferredLanguage:t,blocks:n,googleAnalytics:i},s,a,o){let r={};e&&(r=Object.assign({},e),r.hl||(r.hl=t));let d=null==e?void 0:e.resultsPageBaseUrl;d||(d=window.location.origin);return new Google(s.uuid,n,r,i,d,o)}constructor(e,t,n,i,s,a){this._blocks=t,this._pageOptions=n,this.uuid=e,this._baseURL=new URL(s),this._signature=a,this.ads=new Ads(this.blocks,this.pageOptions),this.tagManager=new TagManager(i)}injectTagManager(){this.tagManager.inject()}injectAds(){return __awaiter(this,void 0,void 0,(function*(){yield this.ads.inject()}))}waitForBlocks(){return __awaiter(this,void 0,void 0,(function*(){return this.ads.waitForBlocks()}))}get blocks(){return(this._blocks||[]).filter((e=>this.wantsToServeAds?e.type===BLOCKS_TYPE:e.container===BLOCKS_CONTAINER)).map((e=>{const 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this.adblock.inject(),this.google=Google.build(this.findDomainResponse,this.parkResponse,this.adblock,buildSignature({context:this.context,callbacks:null===(t=this.google)||void 0===t?void 0:t.callbacks},"click")),this.google.injectTagManager();const n=Parking.build(this.findDomainResponse,this.google);Render.prerender(n),this.cookieConsentManager=new CookieConsentManager,yield this.cookieConsentManager.inject();let i=Failed.cannotPark(this.findDomainResponse);if(i)return void(yield this.transitionToFailed(i,n));yield this.google.injectAds();let s=Disabled.build(this.findDomainResponse,this.adblock.state);if(s)return void(yield this.transitionToDisabled(s,n));const a=this.adblock.hasAdblocker();a&&this.adblock.handleAdblocked();const o=Sales.build(this.findDomainResponse);if(o)return void(yield this.transitionToSales(o));this.eligibleForZeroClick&&(this.zeroClickResponse=yield getZeroClick(this.context));const r=Redirect.build(this.findDomainResponse,this.zeroClickResponse,this.google);if(r)yield this.transitionToRedirect(r);else{if(a)return s=Disabled.build(this.findDomainResponse,this.adblock.state),void(yield this.transitionToDisabled(s,n));i=Failed.noSponsors(this.google),i?yield this.transitionToFailed(i,n):yield this.transitionToParking(n)}}))}transitionToParking(e){return __awaiter(this,void 0,void 0,(function*(){this.state=e,Render.template(e),Render.revealPage(),yield this.google.waitForBlocks(),yield this.track()}))}transitionToRedirect(e){return __awaiter(this,void 0,void 0,(function*(){this.state=e;const t=this.track();Render.revealPage(),yield waiter(e.delay,(e=>Render.loading(e))),yield t,window.location.href=e.url,log(`➡ Redirecting [${e.url}]`)}))}transitionToFailed(e,t){return __awaiter(this,void 0,void 0,(function*(){this.state=e,Render.message(e.message),Render.injectJS(t.javascript),Render.revealPage(),yield this.track()}))}transitionToSales(e){return __awaiter(this,void 0,void 0,(function*(){this.state=e,e.init(this.context),yield this.track()}))}transitionToDisabled(e,t){return __awaiter(this,void 0,void 0,(function*(){this.state=e,Render.message(e.message),Render.injectJS(t.javascript),Render.revealPage(),yield this.track()}))}track(){var e;return __awaiter(this,void 0,void 0,(function*(){if(!this.state.track)return Promise.resolve();try{const t=this.state.trackingType;return null===(e=this.pixels)||void 0===e||e.dispatchEvent({type:t}),trackVisit({context:this.context,callbacks:this.google.callbacks},t)}catch(e){return}}))}get eligibleForZeroClick(){const{cannotPark:e,canZeroClick:t,zeroClick:n}=this.findDomainResponse,{cannotLoadAds:i,wantsToServeAds:s}=this.google;return this.adblock.state!==Blocking.BLOCKED&&(!!t&&(!!e||(!(!i||s)||!!(null==n?void 0:n.reason))))}get context(){var e,t,n,i;const s=this.findDomainResponse,a=this.parkResponse,o=null===(e=this.state)||void 0===e?void 0:e.toContext(),r=null===(t=this.adblock)||void 0===t?void 0:t.toContext(),d=null===(n=this.google)||void 0===n?void 0:n.toContext(),c=browserState(),l=Object.assign(Object.assign({},null===(i=this.findDomainResponse)||void 0===i?void 0:i.zeroClick),this.zeroClickResponse);return Object.assign(Object.assign(Object.assign(Object.assign(Object.assign(Object.assign(Object.assign({app_version:APP_VERSION},s),a),r),d),o),c),{zeroClick:l})}init(){return __awaiter(this,void 0,void 0,(function*(){try{window.__parkour=this,yield this.main()}catch(e){console.error("app",e);const t=Failed.fromError(e);this.state=t,Render.message(t.message),Render.revealPage()}}))}}(new App).init(),exports.App=App}));

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How to block SSH login brute force

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