Encrypt sensitive credential fields before event bus emission (#215)

- Add encrypt_credential_dict() and decrypt_credential_field() to utils/crypto.py
- Create utils/credential_encryption.py with encryption/decryption helpers
- Add get_credential_encryption_key() to retrieve key from Infisical at runtime
- Add emit_credential_found() wrapper for modules to use instead of direct bus.emit()
- Update all 15 modules emitting CREDENTIAL_FOUND to use encrypted wrapper
- Update 4 modules consuming CREDENTIAL_FOUND to decrypt payload before processing
- Sensitive fields (username, password, hash, token, etc.) encrypted with AES-256-GCM
- Falls back to plaintext if encryption key unavailable or encryption fails

modules/passive/cloud_token_harvester.py

@@ -19,6 +19,7 @@ from pathlib import Path
 from typing import Optional
 
 from modules.base import BaseModule
+from utils.credential_encryption import emit_credential_found
 
 logger = logging.getLogger("sensor.passive.cloud_token_harvester")
 
@@ -259,14 +260,14 @@ class CloudTokenHarvester(BaseModule):
                 }, source_module=self.name)
 
                 # Also feed to credential_db
-                self.bus.emit("CREDENTIAL_FOUND", {
+                emit_credential_found(self.bus, self.name, {
                     "source": f"cloud_token_{token_type}",
                     "username": "",
                     "credential": token_value,
                     "source_ip": src_ip,
                     "dest_ip": dst_ip,
                     "protocol": "http",
-                }, source_module=self.name)
+                })
 
                 self._record_token(ts, src_ip, dst_ip, token_type, token_value, context)