feat(microsoft-defender-o365): new O365 email-remediation integration

Microsoft Graph mail APIs, 7 commands: search mailbox messages, get message,
list attachments, list folders, move message, hard-delete (purge) message.
Azure AD OAuth2 client-credentials auth (Mail.ReadWrite), stdlib-only.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

integrations/microsoft-defender-o365/scripts/search_messages.py

@@ -0,0 +1,93 @@
+import json, os, sys, urllib.parse, urllib.request, urllib.error
+
+GRAPH = "https://graph.microsoft.com/v1.0"
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def _token(cfg):
+    tenant = str(cfg.get("tenant_id", ""))
+    url = "https://login.microsoftonline.com/" + tenant + "/oauth2/v2.0/token"
+    form = urllib.parse.urlencode({
+        "grant_type": "client_credentials",
+        "client_id": str(cfg.get("client_id", "")),
+        "client_secret": str(cfg.get("client_secret", "")),
+        "scope": "https://graph.microsoft.com/.default",
+    }).encode("utf-8")
+    req = urllib.request.Request(url, data=form, headers={"Content-Type": "application/x-www-form-urlencoded"}, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        tok = json.loads(r.read())
+    if not tok.get("access_token"):
+        raise Exception("Token request failed: " + json.dumps(tok))
+    return tok["access_token"]
+
+
+def graph(method, path, token, body=None, params=None):
+    url = GRAPH + path
+    if params:
+        clean = {k: v for k, v in params.items() if v not in (None, "")}
+        if clean:
+            url += "?" + urllib.parse.urlencode(clean)
+    data = json.dumps(body).encode("utf-8") if body is not None else None
+    headers = {"Authorization": "Bearer " + token, "Accept": "application/json"}
+    if data is not None:
+        headers["Content-Type"] = "application/json"
+    req = urllib.request.Request(url, data=data, headers=headers, method=method)
+    with urllib.request.urlopen(req, timeout=90) as r:
+        raw = r.read()
+        return json.loads(raw) if raw else {}
+
+
+def _run(fn):
+    try:
+        cfg = _cfg()
+        inputs = _inputs()
+        token = _token(cfg)
+        print(json.dumps(fn(token, 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)
+
+
+q = lambda v: urllib.parse.quote(str(v), safe="")
+
+
+def _odata_escape(v):
+    return str(v).replace("'", "''")
+
+
+def main(token, inputs):
+    mailbox = inputs.get("mailbox")
+    if not mailbox:
+        raise Exception("mailbox is required")
+
+    subject = inputs.get("subject")
+    from_address = inputs.get("from_address")
+    search = inputs.get("search")
+    limit = int(inputs.get("limit") or 25)
+
+    if search:
+        params = {"$search": '"' + search + '"', "$top": limit}
+    elif subject or from_address:
+        parts = []
+        if subject:
+            parts.append("subject eq '" + _odata_escape(subject) + "'")
+        if from_address:
+            parts.append("from/emailAddress/address eq '" + _odata_escape(from_address) + "'")
+        params = {"$filter": " and ".join(parts), "$top": limit}
+    else:
+        params = {"$top": limit}
+
+    return graph("GET", "/users/" + q(mailbox) + "/messages", token, params=params)
+
+
+_run(main)