feature/cif3-output

AUTHORS

@@ -29,6 +29,7 @@ Pedro Miguel Reis <pedro.m.reis@gmail.com>
 Raphaël Vinot <raphael@vinot.info>
 Robert Sefr <robert.sefr@outlook.com>
 Roland Geider <Roland Geider roland@intevation.de>
+REN-ISAC <soc@ren-isac.net>
 Sascha Wilde <Sascha Wilde wilde@intevation.de>
 Sybil Ehrensberger <sybil.ehrensberger@switch.ch>
 TIago Pedrosa <pedrosa.tiago@gmail.com>

CHANGELOG.md

@@ -32,6 +32,7 @@ CHANGELOG
   - Allow empty lists in sieve rule files (PR#2341 by Mikk Margus Möll).
 
 #### Outputs
+- `intelmq.bots.output.cif3.output`: Added (PR#2244 by Michael Davis).
 
 ### Documentation
 

docs/index.rst

@@ -62,6 +62,7 @@ Connecting with other systems
    user/ELK-Stack
    user/MISP-Integrations
    user/n6-integrations
+   user/CIFv3-Integrations
    user/eventdb
    user/abuse-contacts
 

docs/user/CIFv3-Integrations.rst

@@ -0,0 +1,16 @@
+..
+   SPDX-FileCopyrightText: 2022 REN-ISAC
+   SPDX-License-Identifier: AGPL-3.0-or-later
+
+CIFv3 integrations in IntelMQ
+============================
+
+CIF creates an accessible indicator store. A REST API is exposed to interact with the store and quickly process/share indicators.
+CIFv3 can correlate indicators via the UUID attribute.
+
+CIF3 API Output
+-------------------------------
+
+Can be used to submit indicators to a CIFv3 instance by using the `CIFv3 API <https://github.com/csirtgadgets/bearded-avenger-deploymentkit/wiki/REST-API>`_.
+
+Look at the :ref:`Bots' documentation <intelmq.bots.outputs.cif3.output>` for more information.

docs/user/bots.rst

@@ -3599,6 +3599,48 @@ xxx.xxx.xxx.xxx    Intel::ADDR    phishing    100    MISP XXX
 www.testdomain.com    Intel::DOMAIN    apt    85    CERT
 ```
 
+.. _intelmq.bots.outputs.cif3.output:
+
+CIF3 API
+^^^^^^^^
+
+**Information**
+
+* `name:` `intelmq.bots.outputs.cif3.output`
+* `lookup:` no
+* `public:` no
+* `cache (redis db):` none
+* `description:` Connect to a CIFv3 instance and add new indicator if not there already.
+
+The cifsdk library >= 3.0.0rc4,<4.0.0 is required, see
+`REQUIREMENTS.txt <https://github.com/certtools/intelmq/blob/master/intelmq/bots/outputs/cif3/REQUIREMENTS.txt>`_.
+
+**Configuration Parameters**
+
+* **Feed parameters** (see above)
+* `add_feed_provider_as_tag`: boolean (use `false` when in doubt)
+* `cif3_additional_tags`: list of tags to set on submitted indicator(s)
+* `cif3_feed_confidence`: float, used when mapping a feed's confidence fails or
+      if static confidence param is true
+* `cif3_static_confidence`: bool, when true it always sends the `cif3_feed_confidence` value
+      as confidence rather than dynamically interpret feed value (use false when in doubt)
+* `cif3_token`: str, API key for accessing CIF
+* `cif3_url`: str, URL of the CIFv3 instance
+* `fireball`: int, used to batch events before submitting to a CIFv3 instance
+      (default is 500 per batch, use 0 to disable batch and send each event as received)
+* `http_verify_cert`: bool, used to tell whether the CIFv3 instance cert should be verified
+      (default true, but can be set to false if using a local test instance)
+
+By default, CIFv3 does an upsert check and will only insert entirely new indicators. Otherwise,
+upsert matches will have their count increased by 1. By default, the CIF3 output bot will batch indicators
+up to 500 at a time prior to doing a single bulk send. If the output bot doesn't receive a full 500
+indicators within 5 seconds of the first received indicator, it will send what it has so far.
+
+CIFv3 should be able to process indicators as fast as IntelMQ can
+send them.
+
+(More details can be found in the docstring of `output.py <https://github.com/certtools/intelmq/blob/master/intelmq/bots/outputs/cif3/output.py>`_.
+
 .. _intelmq.bots.outputs.elasticsearch.output:
 
 Elasticsearch Output Bot

intelmq/bots/outputs/cif3/REQUIREMENTS.txt

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-FileCopyrightText: 2022 REN-ISAC
+
+cifsdk>=3.0.0rc4,<4.0

intelmq/bots/outputs/cif3/output.py

@@ -0,0 +1,238 @@
+"""Connect to a CIFv3 instance and add indicator(s).
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+SPDX-FileCopyrightText: 2022 REN-ISAC
+
+A shortened copy of this documentation is kept at `docs/user/bots.rst`, please
+keep it current, when changing something.
+
+Parameters:
+  - add_feed_provider_as_tag: bool, use false when in doubt
+  - cif3_additional_tags: list of tags to set on submitted indicator(s)
+  - cif3_feed_confidence: float, used when mapping a feed's confidence fails or
+        if static confidence param is true
+  - cif3_static_confidence: bool (use false when in doubt)
+  - cif3_token: str, API key for accessing CIF
+  - cif3_url: str, URL of the CIFv3 instance
+  - fireball: int, used to batch events before submitting to a CIFv3 instance
+        (default is 500 per batch, use 0 to disable batch and send each event as received)
+  - http_verify_cert: bool, used to tell whether the CIFv3 instance cert should be verified
+        (default true, but can be set to false if using a local test instance)
+
+Example (of some parameters in JSON):
+
+    "add_feed_provider_as_tag": true,
+    "cif3_additional_tags": ["intelmq"]
+
+
+"""
+try:
+    import ujson as json
+except ImportError:
+    JsonLib = None
+
+from datetime import datetime
+from typing import Optional, List
+
+from intelmq.lib.bot import OutputBot
+from intelmq.lib.exceptions import IntelMQException, MissingDependencyError
+
+try:
+    from cifsdk.client.http import HTTP as HttpClient
+    from csirtg_indicator import Indicator
+    from cifsdk._version import get_versions as get_cifsdk_version
+except ImportError:
+    HttpClient = None
+
+INTELMQ_TO_CIF_FIELDS_MAP = {
+    'source.ip': 'indicator',
+    'source.fqdn': 'indicator',
+    'source.url': 'indicator',
+    'source.network': 'indicator',
+    'source.port': 'port',
+    'feed.url': 'reference',
+    'time.source': 'lasttime',
+    'time.observation': 'reporttime',
+    'event_description.text': 'description',
+    'event_description.url': 'reference',
+    'malware.hash.md5': 'indicator',
+    'malware.hash.sha1': 'indicator',
+    'malware.hash.sha256': 'indicator',
+    'malware.name': 'description',
+    'protocol.application': 'application',
+    'protocol.transport': 'protocol',
+    'tlp': 'tlp',
+}
+
+INTELMQ_CLASSIFICATION_TO_CIF_TAGS_MAP = {
+    'c2-server': 'botnet,c2',
+    'undetermined': 'suspicious',
+    'brute-force': 'bruteforce',
+    'other': 'suspicious',
+}
+
+
+class CIF3OutputBot(OutputBot):
+    """
+    Submits indicators to a CIFv3 instance
+
+
+    IntelMQ-Bot-Name: CIFv3 API
+    """
+    add_feed_provider_as_tag: bool = False
+    cif3_feed_confidence: float = 5
+    cif3_static_confidence: bool = False
+    cif3_additional_tags: List[str] = []
+    cif3_token: Optional[str] = None
+    cif3_url: Optional[str] = None
+    fireball: int = 500
+    http_verify_cert: bool = True
+
+    _is_multithreadable = False
+
+    def init(self):
+        try:
+            cifsdk_version = int(get_cifsdk_version().get('version').split('.')[0])
+        except NameError:
+            cifsdk_version = 0
+        # installed cifsdk version must be >=3 and < 4
+        if not 3 <= cifsdk_version < 4:
+            HttpClient = None
+        if HttpClient is None:
+            raise MissingDependencyError(
+                'cifsdk',
+                version='3.0.0rc4,<4.0'
+            )
+        elif JsonLib is None:
+            raise MissingDependencyError(
+                'ujson',
+                version='>=2.0'
+            )
+
+        self.cif3_url = self.cif3_url.rstrip('/')
+
+        self.logger.info(f"Connecting to CIFv3 instance at {self.cif3_url!r}.")
+        self.cli = HttpClient(self.cif3_url,
+                              self.cif3_token,
+                              verify_ssl=self.http_verify_cert)
+
+        try:
+            _ = self.cli.ping(write=True)
+        except Exception as err:
+            raise ValueError(f"Error connecting to CIFv3 instance: {err}")
+        else:
+            self.logger.info('Connected to CIFv3 instance.')
+
+        self.indicator_list = []
+        self.indicator_list_max_records = self.fireball
+        self.indicator_list_max_seconds = 5
+        self.last_flushed = None
+
+    def process(self):
+        intelmq_event = self.receive_message().to_dict(jsondict_as_string=True)
+
+        cif3_indicator = self._parse_event_to_cif3(intelmq_event)
+
+        if not self.fireball:
+            self._submit_cif3_indicator(cif3_indicator)
+        elif len(self.indicator_list) > 0 and (
+            (
+                (datetime.now() - self.last_flushed).total_seconds() >
+                self.indicator_list_max_seconds
+            ) or
+                len(self.indicator_list) >= self.indicator_list_max_records
+        ):
+            self._submit_cif3_indicator(self.indicator_list)
+            self.indicator_list.clear()
+        else:
+            if len(self.indicator_list) == 0:
+                self.last_flushed = datetime.now()
+            self.indicator_list.append(cif3_indicator)
+
+        self.acknowledge_message()
+
+    def _parse_event_to_cif3(self, intelmq_event):
+        """
+        Takes in an IntelMQ event, parses fields to those used by CIFv3
+        Returns CIFv3 Indicator object
+        """
+        # build new cif3 indicator dict
+        new_cif3_dict = {}
+        new_cif3_dict['tags'] = []
+
+        new_cif3_dict['provider'] = intelmq_event.get('feed.provider', 'IntelMQ')
+
+        # set the tags
+        if (self.add_feed_provider_as_tag and
+                'feed.provider' in intelmq_event):
+            new_tag = intelmq_event['feed.provider']
+            new_cif3_dict['tags'].append(new_tag)
+
+        matched_tag = False
+        if 'classification.type' in intelmq_event:
+            for classification in INTELMQ_CLASSIFICATION_TO_CIF_TAGS_MAP.keys():
+                if classification in intelmq_event['classification.type']:
+                    new_cif3_dict['tags'].extend(
+                        INTELMQ_CLASSIFICATION_TO_CIF_TAGS_MAP[classification].split(','))
+                    matched_tag = True
+            if not matched_tag:
+                new_cif3_dict['tags'].append(intelmq_event['classification.type'])
+
+        for new_tag in self.cif3_additional_tags:
+            new_cif3_dict['tags'].append(new_tag)
+
+        # map the confidence
+        if 'feed.accuracy' in intelmq_event:
+            if not self.cif3_static_confidence:
+                new_cif3_dict['confidence'] = (intelmq_event['feed.accuracy'] / 10)
+        if not new_cif3_dict.get('confidence'):
+            new_cif3_dict['confidence'] = self.cif3_feed_confidence
+
+        # map remaining IntelMQ fields to CIFv3 fields
+        for intelmq_type in INTELMQ_TO_CIF_FIELDS_MAP.keys():
+            if intelmq_type in intelmq_event:
+                cif3_field = INTELMQ_TO_CIF_FIELDS_MAP[intelmq_type]
+                new_cif3_dict[cif3_field] = intelmq_event[intelmq_type]
+
+        # build the CIFv3 indicator object from the dict
+        new_indicator = None
+        try:
+            new_indicator = Indicator(**new_cif3_dict)
+        except Exception as err:
+            self.logger.error(f"Error creating indicator: {err}")
+            raise
+
+        return new_indicator
+
+    def _submit_cif3_indicator(self, indicators):
+        # build the CIFv3 indicator object from the dict
+        self.logger.debug(f"Sending {len(indicators)} indicator(s).")
+        try:
+            resp = self.cli.indicators_create(indicators)
+        except Exception as err:
+            self.logger.error(f"Error submitting indicator(s): {err}")
+            raise
+        else:
+            if isinstance(resp, list):
+                resp = json.loads(resp[0])
+                if resp.get('status') == 'success':
+                    resp = resp['data']
+            self.logger.debug(f"CIFv3 instance successfully inserted {resp} new indicator(s).")
+
+    @staticmethod
+    def check(parameters):
+        required_parameters = [
+            'cif3_token',
+            'cif3_url',
+        ]
+        missing_parameters = []
+        for para in required_parameters:
+            if parameters[para] is None:
+                missing_parameters.append(para)
+
+        if len(missing_parameters) > 0:
+            return [["error",
+                     f"These parameters must be set (not null): {missing_parameters!s}."]]
+
+
+BOT = CIF3OutputBot

intelmq/tests/bots/outputs/cif3/test_output.py

@@ -0,0 +1,15 @@
+# SPDX-FileCopyrightText: 2022 REN-ISAC
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# -*- coding: utf-8 -*-
+import os
+#  import unittest
+
+#  import intelmq.lib.test as test
+if os.environ.get('INTELMQ_TEST_EXOTIC'):
+    from intelmq.bots.outputs.cif3.output import CIF3OutputBot  # noqa
+
+# This file is a stub
+# We cannot do much more as we are missing a mock CIFv3 instance to use
+# to initialise cifsdk