What it does. Deploy and configure a TAXII 2.1 server (Medallion) with Docker, publish Part of mukul975/Anthropic-Cybersecurity-Skills (817 security skills) (mukul975/Anthropic-Cybersecurity-Skills).

Install

• npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-taxii-server-with-opentaxii, or copy the skill folder into ~/.claude/skills/implementing-taxii-server-with-opentaxii/.
• Raw file: curl -sL https://raw.githubusercontent.com/mukul975/Anthropic-Cybersecurity-Skills/HEAD/skills/implementing-taxii-server-with-opentaxii/SKILL.md

SKILL.md (verbatim)

name: implementing-taxii-server-with-opentaxii
description: Deploy and configure a TAXII 2.1 server (Medallion) with Docker, publish
  and consume STIX 2.1 bundles across collections, and integrate the feed with SIEM/SOAR
  platforms for automated indicator exchange between organizations. Use when standing
  up a TAXII server to share threat intel, configuring collections for CTI feeds,
  or automating STIX indicator ingestion into a SIEM/SOAR.
domain: cybersecurity
subdomain: threat-intelligence
tags:
- taxii
- stix
- opentaxii
- threat-sharing
- cti
- indicator-exchange
- taxii-server
- automation
version: '1.0'
author: mahipal
license: Apache-2.0
nist_csf:
- ID.RA-01
- ID.RA-05
- DE.CM-01
- DE.AE-02
mitre_attack:
- T1591
- T1592
- T1593
- T1589

Implementing TAXII Server with OpenTAXII

Overview

TAXII (Trusted Automated eXchange of Intelligence Information) is an OASIS standard protocol for exchanging cyber threat intelligence over HTTPS. OpenTAXII is an open-source TAXII server implementation by EclecticIQ that supports TAXII 1.x, while the OASIS cti-taxii-server provides a TAXII 2.1 reference implementation. This skill covers deploying a TAXII server, configuring collections for threat intelligence feeds, publishing STIX 2.1 bundles, and integrating with SIEM/SOAR platforms for automated indicator ingestion.

When to Use

• When deploying or configuring implementing taxii server with opentaxii capabilities in your environment
• When establishing security controls aligned to compliance requirements
• When building or improving security architecture for this domain
• When conducting security assessments that require this implementation

Prerequisites

• Python 3.9+ with medallion, stix2, taxii2-client, opentaxii, cabby libraries
• Docker and Docker Compose for containerized deployment
• Understanding of STIX 2.1 objects (Indicator, Malware, Attack Pattern, Relationship)
• Familiarity with REST APIs and HTTPS configuration
• TLS certificates for production deployment

Key Concepts

TAXII 2.1 Architecture

TAXII 2.1 defines three services: Discovery (find available API roots), API Root (entry point for collections), and Collections (repositories of CTI objects). Collections support two access models: the Collection endpoint allows consumers to poll for objects, and the Status endpoint tracks the result of add operations. TAXII uses HTTP content negotiation with application/taxii+json;version=2.1.

Sharing Models

TAXII supports hub-and-spoke (central server distributes to consumers), peer-to-peer (bidirectional sharing between partners), and source-subscriber (producer publishes, consumers subscribe) models. Each collection can have read-only, write-only, or read-write access controls.

STIX 2.1 Content

TAXII transports STIX 2.1 bundles containing Structured Threat Information objects: Indicators (detection patterns), Observed Data, Malware, Attack Patterns, Threat Actors, Intrusion Sets, Campaigns, Relationships, and Sightings. Each object has a unique STIX ID, creation/modification timestamps, and optional TLP marking definitions.

Workflow

Step 1: Deploy TAXII 2.1 Server with Medallion

# Install medallion (OASIS reference implementation)
# pip install medallion

# medallion_config.json
import json

config = {
    "backend": {
        "module_class": "MemoryBackend",
        "filename": "taxii_data.json"
    },
    "users": {
        "admin": "admin_password_change_me",
        "analyst": "analyst_password_change_me",
        "readonly": "readonly_password_change_me"
    },
    "taxii": {
        "max_content_length": 10485760
    }
}

# Create initial data store
taxii_data = {
    "discovery": {
        "title": "Threat Intelligence TAXII Server",
        "description": "TAXII 2.1 server for sharing CTI indicators",
        "contact": "soc@organization.com",
        "default": "https://taxii.organization.com/api/",
        "api_roots": ["https://taxii.organization.com/api/"]
    },
    "api_roots": {
        "api": {
            "title": "Threat Intelligence API Root",
            "description": "Primary API root for threat intelligence sharing",
            "versions": ["application/taxii+json;version=2.1"],
            "max_content_length": 10485760,
            "collections": {
                "malware-iocs": {
                    "id": "91a7b528-80eb-42ed-a74d-c6fbd5a26116",
                    "title": "Malware IOCs",
                    "description": "Indicators of compromise from malware analysis",
                    "can_read": True,
                    "can_write": True,
                    "media_types": ["application/stix+json;version=2.1"]
                },
                "apt-intelligence": {
                    "id": "52892447-4d7e-4f70-b94a-5460e242dd23",
                    "title": "APT Intelligence",
                    "description": "Advanced persistent threat group intelligence",
                    "can_read": True,
                    "can_write": True,
                    "media_types": ["application/stix+json;version=2.1"]
                },
                "phishing-indicators": {
                    "id": "64993447-4d7e-4f70-b94a-5460e242ee34",
                    "title": "Phishing Indicators",
                    "description": "Phishing URLs, domains, and email indicators",
                    "can_read": True,
                    "can_write": True,
                    "media_types": ["application/stix+json;version=2.1"]
                }
            }
        }
    }
}

with open("medallion_config.json", "w") as f:
    json.dump(config, f, indent=2)
with open("taxii_data.json", "w") as f:
    json.dump(taxii_data, f, indent=2)
print("[+] TAXII server configuration created")

Step 2: Docker Deployment

# docker-compose.yml
version: '3.8'
services:
  taxii-server:
    image: python:3.11-slim
    container_name: taxii-server
    working_dir: /app
    volumes:
      - ./medallion_config.json:/app/medallion_config.json
      - ./taxii_data.json:/app/taxii_data.json
      - ./certs:/app/certs
    ports:
      - "6100:6100"
    command: >
      bash -c "pip install medallion &&
      medallion --host 0.0.0.0 --port 6100
      --config /app/medallion_config.json"
    restart: unless-stopped
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:6100/taxii2/"]
      interval: 30s
      timeout: 10s
      retries: 3

Step 3: Publish STIX 2.1 Objects to Collections

from stix2 import Indicator, Malware, Relationship, Bundle, TLP_WHITE
from taxii2client.v21 import Server, Collection, as_pages
import json
from datetime import datetime

class TAXIIPublisher:
    def __init__(self, server_url, username, password):
        self.server = Server(
            server_url,
            user=username,
            password=password,
        )

    def list_collections(self):
        """List all available collections."""
        api_root = self.server.api_roots[0]
        for collection in api_root.collections:
            print(f"  [{collection.id}] {collection.title} "
                  f"(read={collection.can_read}, write={collection.can_write})")
        return api_root.collections

    def publish_indicators(self, collection_id, indicators):
        """Publish STIX indicators to a TAXII collection."""
        api_root = self.server.api_roots[0]
        collection = Collection(
            f"{api_root.url}collections/{collection_id}/",
            user=self.server._user,
            password=self.server._password,
        )
        bundle = Bundle(objects=indicators)
        response = collection.add_objects(bundle.serialize())
        print(f"[+] Published {len(indicators)} objects to {collection_id}")
        print(f"    Status: {response.status}")
        return response

    def create_malware_indicators(self):
        """Create sample STIX malware indicators."""
        malware = Malware(
            name="SUNBURST",
            description="Backdoor used in SolarWinds supply chain attack (2020). "
                        "Trojanized SolarWinds.Orion.Core.BusinessLayer.dll module.",
            malware_types=["backdoor", "trojan"],
            is_family=True,
            object_marking_refs=[TLP_WHITE],
        )

        indicator_hash = Indicator(
            name="SUNBURST SHA-256 Hash",
            description="SHA-256 hash of trojanized SolarWinds Orion DLL",
            pattern="[file:hashes.'SHA-256' = "
                    "'32519b85c0b422e4656de6e6c41878e95fd95026267daab4215ee59c107d6c77']",
            pattern_type="stix",
            valid_from=datetime(2020, 12, 13),
            indicator_types=["malicious-activity"],
            object_marking_refs=[TLP_WHITE],
        )

        indicator_domain = Indicator(
            name="SUNBURST C2 Domain Pattern",
            description="DGA domain pattern used by SUNBURST for C2",
            pattern="[domain-name:value MATCHES "
                    "'^[a-z0-9]{4,}\\.appsync-api\\..*\\.avsvmcloud\\.com$']",
            pattern_type="stix",
            valid_from=datetime(2020, 12, 13),
            indicator_types=["malicious-activity"],
            object_marking_refs=[TLP_WHITE],
        )

        rel = Relationship(
            relationship_type="indicates",
            source_ref=indicator_hash.id,
            target_ref=malware.id,
        )

        return [malware, indicator_hash, indicator_domain, rel]

publisher = TAXIIPublisher(
    "https://taxii.organization.com/taxii2/",
    "admin", "admin_password_change_me"
)
collections = publisher.list_collections()
indicators = publisher.create_malware_indicators()
publisher.publish_indicators("91a7b528-80eb-42ed-a74d-c6fbd5a26116", indicators)

Step 4: Consume Intelligence from TAXII Collections

from taxii2client.v21 import Server, Collection, as_pages
import json

class TAXIIConsumer:
    def __init__(self, server_url, username, password):
        self.server = Server(server_url, user=username, password=password)

    def poll_collection(self, collection_id, added_after=None):
        """Poll a collection for new STIX objects."""
        api_root = self.server.api_roots[0]
        collection = Collection(
            f"{api_root.url}collections/{collection_id}/",
            user=self.server._user,
            password=self.server._password,
        )

        kwargs = {}
        if added_after:
            kwargs["added_after"] = added_after

        all_objects = []
        for bundle in as_pages(collection.get_objects, per_request=50, **kwargs):
            objects = json.loads(bundle).get("objects", [])
            all_objects.extend(objects)

        indicators = [o for o in all_objects if o.get("type") == "indicator"]
        malware = [o for o in all_objects if o.get("type") == "malware"]
        relationships = [o for o in all_objects if o.get("type") == "relationship"]

        print(f"[+] Polled {len(all_objects)} objects: "
              f"{len(indicators)} indicators, {len(malware)} malware, "
              f"{len(relationships)} relationships")
        return all_objects

    def extract_iocs_for_siem(self, stix_objects):
        """Extract IOCs from STIX objects for SIEM ingestion."""
        iocs = []
        for obj in stix_objects:
            if obj.get("type") == "indicator":
                pattern = obj.get("pattern", "")
                iocs.append({
                    "id": obj.get("id"),
                    "name": obj.get("name", ""),
                    "pattern": pattern,
                    "valid_from": obj.get("valid_from", ""),
                    "indicator_types": obj.get("indicator_types", []),
                    "confidence": obj.get("confidence", 0),
                })
        return iocs

consumer = TAXIIConsumer(
    "https://taxii.organization.com/taxii2/",
    "analyst", "analyst_password_change_me"
)
objects = consumer.poll_collection("91a7b528-80eb-42ed-a74d-c6fbd5a26116")
iocs = consumer.extract_iocs_for_siem(objects)

Step 5: Integrate with SIEM/SOAR

import requests

def push_to_splunk(iocs, splunk_url, hec_token):
    """Push extracted IOCs to Splunk via HEC."""
    headers = {"Authorization": f"Splunk {hec_token}"}
    for ioc in iocs:
        event = {
            "event": ioc,
            "sourcetype": "stix:indicator",
            "source": "taxii-server",
            "index": "threat_intel",
        }
        resp = requests.post(
            f"{splunk_url}/services/collector/event",
            headers=headers,
            json=event,
            verify=not os.environ.get("SKIP_TLS_VERIFY", "").lower() == "true",  # Set SKIP_TLS_VERIFY=true for self-signed certs in lab environments
        )
        if resp.status_code != 200:
            print(f"[-] Splunk HEC error: {resp.text}")
    print(f"[+] Pushed {len(iocs)} IOCs to Splunk")

def push_to_elasticsearch(iocs, es_url, index="threat-intel"):
    """Push IOCs to Elasticsearch."""
    for ioc in iocs:
        resp = requests.post(
            f"{es_url}/{index}/_doc",
            json=ioc,
            headers={"Content-Type": "application/json"},
        )
        if resp.status_code not in (200, 201):
            print(f"[-] ES error: {resp.text}")
    print(f"[+] Indexed {len(iocs)} IOCs in Elasticsearch")

Validation Criteria

• TAXII 2.1 server deployed and accessible via HTTPS
• Collections created with appropriate read/write permissions
• STIX 2.1 bundles published successfully to collections
• Consumer can poll and retrieve objects with filtering
• IOCs extracted and forwarded to SIEM platform
• Authentication and authorization enforced correctly

References

• TAXII 2.1 Specification
• OASIS CTI Documentation
• EclecticIQ OpenTAXII
• cti-taxii-server (Medallion)
• taxii2-client Python Library
• Kraven Security: STIX/TAXII Complete Guide

Other files in this skill

• LICENSE
• references/api-reference.md
• scripts/agent.py

references/api-reference.md (verbatim)

API Reference: OpenTAXII Server

Libraries Used

Installation

# Server
pip install opentaxii

# Client and testing
pip install taxii2-client stix2 requests

Server Configuration

opentaxii.yml

---
persistence_api:
  class: opentaxii.persistence.sqldb.SQLDatabaseAPI
  parameters:
    db_connection: sqlite:////tmp/opentaxii.db
    create_tables: true

auth_api:
  class: opentaxii.auth.sqldb.SQLDatabaseAuth
  parameters:
    db_connection: sqlite:////tmp/opentaxii.db
    create_tables: true
    secret: "change-this-secret-in-production"

taxii1:
  save_raw_inbox_messages: false

logging:
  opentaxii: info
  root: info

Start the Server

# Set config path
export OPENTAXII_CONFIG=/path/to/opentaxii.yml

# Run the server
opentaxii-run-dev --host 0.0.0.0 --port 9000

# Production (with gunicorn)
gunicorn opentaxii.http:app --bind 0.0.0.0:9000

TAXII 2.1 API Endpoints

Server Administration

Create Collections via CLI

opentaxii-create-services -c services.yml
opentaxii-create-collections -c collections.yml
opentaxii-create-account --username admin --password admin123

collections.yml

---
- name: "threat-indicators"
  id: "collection-001"
  description: "Threat intelligence indicators"
  type: "DATA_FEED"
  accept_all_content: true
  can_read: true
  can_write: true

- name: "malware-samples"
  id: "collection-002"
  description: "Malware sample hashes and metadata"
  type: "DATA_SET"
  can_read: true
  can_write: false

Client Operations

Discover Server and Collections

from taxii2client.v21 import Server
import os

server = Server(
    os.environ.get("OPENTAXII_URL", "http://localhost:9000/taxii2/"),
    user=os.environ.get("TAXII_USER", "admin"),
    password=os.environ.get("TAXII_PASS", "admin123"),
)

for api_root in server.api_roots:
    print(f"API Root: {api_root.title}")
    for coll in api_root.collections:
        print(f"  {coll.title} (ID: {coll.id})")
        print(f"  Read: {coll.can_read} | Write: {coll.can_write}")

Push STIX Objects to a Collection

import stix2
from taxii2client.v21 import Collection

collection = Collection(
    f"http://localhost:9000/collections/collection-001/",
    user="admin",
    password="admin123",
)

indicator = stix2.Indicator(
    name="Malicious C2 Domain",
    pattern="[domain-name:value = 'evil.example.com']",
    pattern_type="stix",
    valid_from="2025-01-15T00:00:00Z",
    labels=["malicious-activity"],
)

bundle = stix2.Bundle(objects=[indicator])
collection.add_objects(bundle.serialize())

Fetch Objects from a Collection

objects = collection.get_objects()
for obj in objects.get("objects", []):
    print(f"  {obj['type']}: {obj.get('name', obj['id'])}")

Health Check

import requests

resp = requests.get(
    "http://localhost:9000/taxii2/",
    auth=("admin", "admin123"),
    timeout=10,
)
if resp.status_code == 200:
    discovery = resp.json()
    print(f"Server title: {discovery.get('title')}")
    print(f"API roots: {discovery.get('api_roots', [])}")

Output Format

{
  "title": "OpenTAXII TAXII 2.1 Server",
  "description": "Threat intelligence sharing server",
  "api_roots": ["http://localhost:9000/api/"],
  "collections": [
    {
      "id": "collection-001",
      "title": "threat-indicators",
      "can_read": true,
      "can_write": true,
      "media_types": ["application/stix+json;version=2.1"]
    }
  ]
}

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