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CrowdSec


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CrowdSec Hub for parsers, enrichers and scenarios.

Foreword

This repository stores most of the official parsers/scenarios/collections for crowdsec.

The repository is not intended for use as-is, but rather as source of truth for the CrowdSec Hub and cscli.

Feel free to use the parsers/scenarios here as a source of inspiration.

Testing & Continuous integration

cscli provides a hubtest sub-command to help contributors to create tests for parsers and scenarios.

View & use existing tests

⚠️ most of cscli hubtest commands are expected to be run from the root directory of the hub. A git clone of this repository is the easier way to work ⚠️

list existing tests

cscli hubtest list

run a specific test

cscli hubtest run [test-name]

show current tests coverage

cscli hubtest coverage

Create your own (parser) test

We're going to create the CI tests for the dovecot-parser. Before you start :

  • you will need some actual logs
  • you'd better know if the service logs on its own or via syslog (we're in the later case here)
  1. Create a new test
▶ cscli hubtest create dovecot-logs --type syslog

  Test name                   :  dovecot-logs
  Test path                   :  .../github/hub/.tests/dovecot-logs
  Log file                    :  .../github/hub/.tests/dovecot-logs/dovecot-logs.log (please fill it with logs)
  Parser assertion file       :  .../github/hub/.tests/dovecot-logs/parser.assert (please fill it with assertion)
  Scenario assertion file     :  .../github/hub/.tests/dovecot-logs/parser.assert (please fill it with assertion)
  Configuration File          :  .../github/hub/.tests/dovecot-logs/config.yaml (please fill it with parsers, scenarios...)

What is relevant here is that every test is composed of :

  • A log file and it's associated type (same type as seen in acquis labels:type)
  • A configuration specifying which parsers and/or scenarios must be enabled for the test
  • A ultimately list of assertions that must be run against the parsers and/or scenarios output

Note: You can provide the parsers and scenarios you want in your test with --parsers and --scenarios (you can provide multiple parsers and scenarios)

If you want to test only a scenario, you can specify (--ignore-parsers) or set the ignore_parsers to true in the config.yaml

  1. Configure your test

We need to edit the test configuration to use the relevant parsers :

▶ cat .../github/hub/.tests/dovecot-logs/config.yaml
parsers:
- crowdsecurity/syslog-logs
- crowdsecurity/dovecot-logs
scenarios:
postoverflows:
- ""
log_file: dovecot-logs.log
log_type: syslog

note: the order doesn't matter. If the parser name is in the form author/parser it's from the hub, but relative paths are allowed for non-versioned parsers

Now we need to dump some actual logs into the test's log file :

▶ cat > .tests/dovecot-logs/dovecot-logs.log 
Jan 28 10:16:13 dovecot-box dovecot[7508]: imap-login: Disconnected (auth failed, 1 attempts in 6 secs): user=<toto@toto.com>, method=PLAIN, rip=4.4.4.4, lip=7.7.7.7, TLS, session=<3650VvK5bdIaW-iK>
Sep 8 07:16:29 canyon dovecot: auth-worker(24058): pam(toto,1.1.1.1,<youpi>): pam_authenticate() failed: Authentication failure (password mismatch?)
Sep 8 07:46:51 canyon dovecot: auth-worker(24544): pam(toto,1.1.1.1): unknown user
  1. Run the test for the first time

Now that we have config & logs, let's run it for the first time :

▶ cscli hubtest run dovecot-logs
INFO[27-09-2021 06:13:59 PM] Running test 'dovecot-logs'                  
INFO[27-09-2021 06:13:59 PM] parser 'crowdsecurity/dovecot-logs' installed succesfully in runtime environment 
INFO[27-09-2021 06:13:59 PM] parser 'crowdsecurity/syslog-logs' installed succesfully in runtime environment 
WARN[27-09-2021 06:14:02 PM] Assert file '/home/bui/github/hub/.tests/dovecot-logs/parser.assert' is empty, generating assertion: 

results["s00-raw"]["crowdsecurity/syslog-logs"][0].Success == true
...
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Success == true
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["pid"] == "7508"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["timestamp"] == "Jan 28 10:16:13"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["dovecot_login_result"] == "Disconnected (auth failed, 1 attempts in 6 secs)"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["message"] == "imap-login: Disconnected (auth failed, 1 attempts in 6 secs): user=<toto@toto.com>, method=PLAIN, rip=4.4.4.4, lip=7.7.7.7, TLS, session=<3650VvK5bdIaW-iK>"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["logsource"] == "syslog"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["program"] == "dovecot"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["protocol"] == "imap"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["dovecot_local_ip"] == "7.7.7.7"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["dovecot_remote_ip"] == "4.4.4.4"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["dovecot_user"] == "toto@toto.com"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Meta["datasource_path"] == "dovecot-logs.log"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Meta["datasource_type"] == "file"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Meta["log_type"] == "dovecot_logs"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Meta["source_ip"] == "4.4.4.4"
...

As our parser.assert is empty, the tool is generating some "suggested" asserts for us. Your careful eye will keep only the ones relevant to the parser you're testing :

▶ cat > .tests/dovecot-logs/parser.assert 
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Success == true
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["pid"] == "7508"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["timestamp"] == "Jan 28 10:16:13"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["dovecot_login_result"] == "Disconnected (auth failed, 1 attempts in 6 secs)"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["message"] == "imap-login: Disconnected (auth failed, 1 attempts in 6 secs): user=<toto@toto.com>, method=PLAIN, rip=4.4.4.4, lip=7.7.7.7, TLS, session=<3650VvK5bdIaW-iK>"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["logsource"] == "syslog"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["program"] == "dovecot"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["protocol"] == "imap"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["dovecot_local_ip"] == "7.7.7.7"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["dovecot_remote_ip"] == "4.4.4.4"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Parsed["dovecot_user"] == "toto@toto.com"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Meta["datasource_path"] == "dovecot-logs.log"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Meta["datasource_type"] == "file"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Meta["log_type"] == "dovecot_logs"
results["s01-parse"]["crowdsecurity/dovecot-logs"][0].Evt.Meta["source_ip"] == "4.4.4.4"
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Success == true
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Evt.Parsed["dovecot_login_result"] == "Authentication failure (password mismatch?)"
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Evt.Parsed["logsource"] == "syslog"
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Evt.Parsed["message"] == "auth-worker(24058): pam(toto,1.1.1.1,<youpi>): pam_authenticate() failed: Authentication failure (password mismatch?)"
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Evt.Parsed["program"] == "dovecot"
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Evt.Parsed["timestamp"] == "Sep 8 07:16:29"
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Evt.Parsed["dovecot_remote_ip"] == "1.1.1.1"
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Evt.Parsed["dovecot_user"] == "toto"
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Evt.Meta["datasource_path"] == "dovecot-logs.log"
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Evt.Meta["datasource_type"] == "file"
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Evt.Meta["log_type"] == "dovecot_logs"
results["s01-parse"]["crowdsecurity/dovecot-logs"][1].Evt.Meta["source_ip"] == "1.1.1.1"
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Success == true
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Parsed["dovecot_login_result"] == "unknown user"
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Parsed["program"] == "dovecot"
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Parsed["dovecot_remote_ip"] == "1.1.1.1"
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Parsed["dovecot_user"] == "toto"
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Parsed["logsource"] == "syslog"
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Parsed["message"] == "auth-worker(24544): pam(toto,1.1.1.1): unknown user"
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Parsed["timestamp"] == "Sep 8 07:46:51"
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Meta["log_type"] == "dovecot_logs"
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Meta["source_ip"] == "1.1.1.1"
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Meta["datasource_path"] == "dovecot-logs.log"
results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Meta["datasource_type"] == "file"
  1. Test your newly crafted test
▶ cscli hubtest run dovecot-logs                                
INFO[27-09-2021 06:19:33 PM] Running test 'dovecot-logs'                  
INFO[27-09-2021 06:19:33 PM] parser 'crowdsecurity/syslog-logs' installed succesfully in runtime environment 
INFO[27-09-2021 06:19:33 PM] parser 'crowdsecurity/dovecot-logs' installed succesfully in runtime environment 
Test 'dovecot-logs' passed successfully (39 assertions) 🟩

And be amazed.

Debug your own (parser) test

Things went wrong ? Don't panic

When working on a test, you can as well pass expressions directly to hubtest command and see the results :

▶ cscli hubtest  eval dovecot-logs -e 'results["s01-parse"]["crowdsecurity/dovecot-logs"][2].Evt.Parsed'             
dovecot_login_result: unknown user
dovecot_remote_ip: 1.1.1.1
dovecot_user: toto
facility: ""
logsource: syslog
message: 'auth-worker(24544): pam(toto,1.1.1.1): unknown user'
pid: ""
priority: ""
program: dovecot
timestamp: Sep 8 07:46:51
timestamp8601: ""

Open your PR

yes.

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Main repository for crowdsec scenarios/parsers

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