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/credential_sniffer.py

@@ -26,6 +26,7 @@ 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.credential_sniffer")
 
@@ -608,7 +609,7 @@ class CredentialSniffer(BaseModule):
                 self._flush_buffer()
 
         # Immediate bus notification
-        self.bus.emit("CREDENTIAL_FOUND", {
+        emit_credential_found(self.bus, self.name, {
             "source_ip": src_ip,
             "target_ip": target_ip,
             "target_port": target_port,
@@ -617,7 +618,7 @@ class CredentialSniffer(BaseModule):
             "domain": domain,
             "cred_type": cred_type,
             "hashcat_mode": hashcat_mode,
-        }, source_module=self.name)
+        })
 
         logger.info(
             "CREDENTIAL: %s %s@%s:%d (%s/%s)",