SpyLog

Execute actions based on log records

---

The main goal of this project is provide fail2ban functionality to Windows.

Install/Start

The lua-spylog consist of three services.

• filter - read logs from sources and extract date(optional) and IP and send them to jail service.
• jail - read messages from filter service and support time couter. If some counter is reached to maxretry then jail send message to action service.
• action - read messages from jail service and support queue of actions to be done. When it recv new message it push 2 new action to queue (ban and unban). Queue is persistent.

All services can be run as separate process or as thread in one multithreaded process. To run spylog as Windows service you can use LuaService.

For Windows there exists installer which allows install SpyLog and all dependencies. You can download it form Releases page.

Configuration

Detect auth fail on FreeSWITCH system

-- config/sources/freeswitch.lua
SOURCE{"freeswitch",
  "esl:[email protected]:8021",
  level = 'WARNING';
}

-- config/filters/freeswitch.lua
FILTER{ "freeswitch-auth-fail";
  enabled = true;
  source  = "freeswitch";
  failregex = {
    "^(%d%d%d%d%-%d%d%-%d%d %d%d:%d%d:%d%d%.%d+) %[WARNING%] sofia_reg.c:%d+ SIP auth failure %([A-Z]+%) on sofia profile %'[^']+%' for %[.-%] from ip ([0-9.]+)%s*$";
    "^(%d%d%d%d%-%d%d%-%d%d %d%d:%d%d:%d%d%.%d+) %[WARNING%] sofia.c:%d+ IP ([0-9.]+) Rejected by acl \"[^\"]*\"%s*$";
  }
};

-- config/jails/freeswitch.lua
JAIL{"voip-auth-fail";
  enabled  = true;
  filter   = {"freeswitch-auth-fail"};
  findtime = 600;
  maxretry = 3;
  bantime  = 3600 * 24;
  action   = {"mail", "growl", "ipsec"};
}

Supported sources

• Text log file
• UDP raw server
• SysLog UDP server (rfc3164 and rfc5424)
• SNMP trap UDP server (allows handle Windows event logs)
• EventLog (based on event trap) allows additional filters based on source names.
• FreeSWITCH ESL TCP connection
• TCP raw connection
• Process stdout and/or stderr

Filters

Named captures

By default filter names first capure as date and second one as host. If there only one capture then date set as current timestamp and capture names as host. It is possible to assign names to captures using capture array.

FILTER{'nginx-404',
  capture = {'host', 'date'}; -- we have to swap `date` and `host`
  failregex = '^([0-9.]+) %- %- %[(.-)%].-GET.-HTTP.- 404';
}

Also it possible add any other captures. They will be send to jails as whell.

Ignore regex

Filters support ignoreregex field to exclude records which already matched by failregex

Exclude IP

Filters support exclude array which allows exclude some IP and networks.

Jails

Each jail is just array of counters with some expire time.

Counter types

Currently supports this counter types

• incremental increment to one for each filter message
• accumulate get increment value from filter message. Can be used e.g. to calculate total calls duration in some VOIP system.
• fixed just return value from filter message. Can be used e.g. to monitor max call duration for calls in some VOIP system.

By default increment type uses.

Counter control values

Each counter do count for some value (like counter[id] = counter[id] + value). To specify id field you can use capture field. By default it is host. To specify value you can use value field. There no default value for this. E.g. in voip system it may be need monitor each account and block them .

JAIL{
  ...
  counter  = {
    type    = 'accumulate';
    capture = 'account'; -- count total duration for each account
    value   = 'duration'; -- what value use to increment.
  };
}

Capture filters

It is also possible add some additional filter to filters and jails.

Example 1. Add black list for user names for RDP service.

JAIL{"rdp-bad-user-access"; -- e.g. can ban after first attempt
  -- apply this jail only for specific user list
  cfilter  = {"list",
    type    = "allow",
    capture = "user",
    nocase  = true,
    filter  = { "admin", "guest", "user", "root"};
  };
}

Example 2. Counts attempts to call only to some specific area codes.

JAIL{
  -- count only calls to Cuba and Albania and exclude '192.168.123.22' host
  cfilter = {
    {'prefix',            -- filter type
      type    = 'allow',  -- count if match
      capture = 'number', -- capture name to filter
      filter = {          -- filter rules
        '53',  -- Cuba 
        '355', -- Albania
      }
    };

    {'acl',              -- filter type
      type    = 'deny',  -- count if not match
      capture = 'host',  -- capture name to filter
      filter  = {        -- filter rules
        '192.168.123.22',
      }
    };
  }
}

Example 3. Apply jail to some countries only.

JAIL{"rdp-bad-country-access"; -- e.g. can ban after first attempt
  -- apply this jail for all counties except Russia and North America
  cfilter  = {"geoip",
    type    = "deny",
    filter  = { 'ru', continent = {'na'} };
  };
}

Each capture filter should have name as first element, capture and filter fields. Currently support prefix, acl, regex, list and geoip filters. capture field specify what value from capture should be used in this fileter. filter is set of rules had specific format for each type of filter. prefix filter should have filter field as array of prefixes of file name. acl filter should have filter field as array of IP and/or CIDR. regex filter should have filter field as string/array of strings. list filter should have list field as string/array of strings.

Dependencies

• bit32
• date
• lluv
• lluv-poll-zmq
• lpeg
• Lrexlib-PCRE
• lua-cjson
• lua-llthreads2
• lua-log
• lua-path
• Lua-Sqlite3
• LuaFileSystem
• luuid
• lzmq
• StackTracePlus
• LuaService
• environ

To support mail action

• lluv-ssl
• sendmail
• try

To support growl action

• gntp
• openssl

To support esl source type

• lluv-esl

To support prefix capture filter

• prefix_tree

To support geoip capture filter

• mmdblua
• compat53
• lua-lru (optional)