feat(feed): add DShield block list feed connector (SANS ISC)

integrations/feed-dshield/manifest.yaml

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+id: feed_dshield
+name: DShield Block List Feed
+version: 1.0.0
+description: "SANS Internet Storm Center DShield feed connector — pull the recommended block list (networks responsible for the most attacks seen by the DShield sensor network) and emit normalized IOCs (CIDR + type, with country) for import into the Threat Indicator Manager. Free, no authentication required; stdlib-only, no extra Python dependencies."
+changelog: "1.0.0 — Initial release: fetch the DShield recommended block list."
+category: feed
+
+# The DShield block list is a free SANS ISC feed served over HTTPS. No key needed.
+config_schema:
+  properties:
+    feed_url:
+      type: string
+      description: "Override the block-list URL (default https://feeds.dshield.org/block.txt)"
+    insecure:
+      type: boolean
+      description: "Trust any TLS certificate (not secure)"
+      default: false
+  required: []
+
+commands:
+  - id: fetch_indicators
+    name: feed-dshield-fetch-indicators
+    description: "Fetch the DShield block list and return normalized indicators."
+    risk: read
+    inputs_schema:
+      properties:
+        max_indicators: { type: number, description: "Max indicators to return (0 = no limit, default 0)" }
+      required: []
+    outputs_schema: { properties: {} }
+
+  - id: test_connection
+    name: feed-dshield-test-connection
+    description: "Verify the DShield feed is reachable (used by the Test button)."
+    risk: read
+    inputs_schema:
+      properties: {}
+      required: []
+    outputs_schema: { properties: {} }

integrations/feed-dshield/scripts/fetch_indicators.py

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+import json, os, sys, ssl, urllib.request, urllib.error
+
+DEFAULT_URL = "https://feeds.dshield.org/block.txt"
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def _ctx(cfg):
+    if cfg.get("insecure"):
+        c = ssl.create_default_context()
+        c.check_hostname = False
+        c.verify_mode = ssl.CERT_NONE
+        return c
+    return None
+
+
+def _get(url, cfg):
+    req = urllib.request.Request(url, headers={"User-Agent": "Riposte-SOAR"})
+    with urllib.request.urlopen(req, timeout=120, context=_ctx(cfg)) as r:
+        return r.read()
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    url = cfg.get("feed_url") or DEFAULT_URL
+    raw = _get(url, cfg).decode("utf-8", "replace")
+
+    maxn = int(inputs.get("max_indicators") or 0)
+    out = []
+    for line in raw.splitlines():
+        line = line.rstrip()
+        if not line or line.lstrip().startswith("#"):
+            continue
+        # tab-separated: Start End Netmask Attacks Name Country Email
+        cols = line.split("\t")
+        if len(cols) < 3:
+            cols = line.split()
+        if len(cols) < 3:
+            continue
+        start = cols[0].strip()
+        netmask = cols[2].strip()
+        if start.count(".") != 3 or not netmask.isdigit():
+            continue
+        item = {"value": start + "/" + netmask, "type": "cidr", "start": start, "netmask": netmask}
+        if len(cols) > 5 and cols[5].strip():
+            item["country"] = cols[5].strip()
+        out.append(item)
+        if maxn and len(out) >= maxn:
+            break
+
+    return {"source": "dshield:block", "count": len(out), "indicators": out}
+
+
+_run(main)

integrations/feed-dshield/scripts/test_connection.py

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+import json, os, sys, ssl, urllib.request, urllib.error
+
+DEFAULT_URL = "https://feeds.dshield.org/block.txt"
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def _ctx(cfg):
+    if cfg.get("insecure"):
+        c = ssl.create_default_context()
+        c.check_hostname = False
+        c.verify_mode = ssl.CERT_NONE
+        return c
+    return None
+
+
+def _get(url, cfg):
+    req = urllib.request.Request(url, headers={"User-Agent": "Riposte-SOAR"})
+    with urllib.request.urlopen(req, timeout=60, context=_ctx(cfg)) as r:
+        return r.read()
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    url = cfg.get("feed_url") or DEFAULT_URL
+    raw = _get(url, cfg).decode("utf-8", "replace")
+    n = sum(1 for ln in raw.splitlines() if ln and not ln.lstrip().startswith("#"))
+    return {"ok": True, "sample_lines": n}
+
+
+_run(main)