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Incorporated Script Code-Signing

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This commit is contained in:
Nicole Rappe
2025-10-19 19:55:19 -06:00
parent 7700865bf7
commit 03bb19ef05
6 changed files with 313 additions and 54 deletions
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94
Data/Agent/agent.py
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@@ -36,6 +36,7 @@ import aiohttp
import socketio
from security import AgentKeyStore
from signature_utils import decode_script_bytes as _decode_script_bytes, verify_and_store_script_signature as _verify_and_store_script_signature
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import ed25519
@@ -2339,47 +2340,6 @@ async def send_heartbeat():
await asyncio.sleep(60)
def _verify_and_store_script_signature(
client: AgentHttpClient,
script_bytes: bytes,
signature_b64: str,
signing_key_hint: Optional[str] = None,
) -> bool:
candidates: List[str] = []
if isinstance(signing_key_hint, str) and signing_key_hint.strip():
candidates.append(signing_key_hint.strip())
stored_key = client.load_server_signing_key()
if stored_key:
key_text = stored_key.strip()
if key_text and key_text not in candidates:
candidates.append(key_text)
for key_b64 in candidates:
try:
key_der = base64.b64decode(key_b64, validate=True)
except Exception:
continue
try:
public_key = serialization.load_der_public_key(key_der)
except Exception:
continue
if not isinstance(public_key, ed25519.Ed25519PublicKey):
continue
try:
signature = base64.b64decode(signature_b64, validate=True)
except Exception:
return False
try:
public_key.verify(signature, script_bytes)
if stored_key and stored_key.strip() != key_b64:
client.store_server_signing_key(key_b64)
elif not stored_key:
client.store_server_signing_key(key_b64)
return True
except Exception:
continue
return False
async def poll_script_requests():
await asyncio.sleep(20)
client = http_client()
@@ -2394,9 +2354,9 @@ async def poll_script_requests():
signature_b64 = response.get("signature")
sig_alg = (response.get("sig_alg") or "").lower()
if script_b64 and signature_b64:
script_bytes = _decode_base64_bytes(script_b64)
script_bytes = _decode_script_bytes(script_b64, "base64")
if script_bytes is None:
_log_agent('received script payload with invalid base64 encoding', fname='agent.error.log')
_log_agent('received script payload with invalid encoding', fname='agent.error.log')
elif sig_alg and sig_alg not in ("ed25519", "eddsa"):
_log_agent(f'unsupported script signature algorithm: {sig_alg}', fname='agent.error.log')
else:
@@ -3233,8 +3193,54 @@ if __name__=='__main__':
return
job_id = payload.get('job_id')
script_type = (payload.get('script_type') or '').lower()
content = _decode_script_payload(payload.get('script_content'), payload.get('script_encoding'))
encoding_hint = payload.get('script_encoding')
script_bytes = _decode_script_bytes(payload.get('script_content'), encoding_hint)
run_mode = (payload.get('run_mode') or 'current_user').lower()
if script_bytes is None:
err = 'Invalid script payload (unable to decode)'
await sio.emit('quick_job_result', {
'job_id': job_id,
'status': 'Failed',
'stdout': '',
'stderr': err,
})
_log_agent(err, fname='agent.error.log')
return
signature_b64 = payload.get('signature')
sig_alg = (payload.get('sig_alg') or 'ed25519').lower()
signing_key = payload.get('signing_key')
if sig_alg and sig_alg not in ('ed25519', 'eddsa'):
err = f"Unsupported script signature algorithm: {sig_alg}"
await sio.emit('quick_job_result', {
'job_id': job_id,
'status': 'Failed',
'stdout': '',
'stderr': err,
})
_log_agent(err, fname='agent.error.log')
return
if not isinstance(signature_b64, str) or not signature_b64.strip():
err = 'Missing script signature; rejecting payload'
await sio.emit('quick_job_result', {
'job_id': job_id,
'status': 'Failed',
'stdout': '',
'stderr': err,
})
_log_agent(err, fname='agent.error.log')
return
client = http_client()
if not _verify_and_store_script_signature(client, script_bytes, signature_b64, signing_key):
err = 'Rejected script payload due to invalid signature'
await sio.emit('quick_job_result', {
'job_id': job_id,
'status': 'Failed',
'stdout': '',
'stderr': err,
})
_log_agent(err, fname='agent.error.log')
return
content = script_bytes.decode('utf-8', errors='replace')
if script_type != 'powershell':
await sio.emit('quick_job_result', { 'job_id': job_id, 'status': 'Failed', 'stdout': '', 'stderr': f"Unsupported type: {script_type}" })
return