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Add new SSE, KMS encryptions

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This commit is contained in:
kqjy
2025-12-01 00:46:12 +08:00
parent 590a39ca80
commit 766dbb18be
12 changed files with 3306 additions and 1 deletions
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22
app/__init__.py
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@@ -18,8 +18,10 @@ from werkzeug.middleware.proxy_fix import ProxyFix
from .bucket_policies import BucketPolicyStore
from .config import AppConfig
from .connections import ConnectionStore
from .encryption import EncryptionManager
from .extensions import limiter, csrf
from .iam import IamService
from .kms import KMSManager
from .replication import ReplicationManager
from .secret_store import EphemeralSecretStore
from .storage import ObjectStorage
@@ -77,6 +79,21 @@ def create_app(
connections = ConnectionStore(connections_path)
replication = ReplicationManager(storage, connections, replication_rules_path)
# Initialize encryption and KMS
encryption_config = {
"encryption_enabled": app.config.get("ENCRYPTION_ENABLED", False),
"encryption_master_key_path": app.config.get("ENCRYPTION_MASTER_KEY_PATH"),
"default_encryption_algorithm": app.config.get("DEFAULT_ENCRYPTION_ALGORITHM", "AES256"),
}
encryption_manager = EncryptionManager(encryption_config)
kms_manager = None
if app.config.get("KMS_ENABLED", False):
kms_keys_path = Path(app.config.get("KMS_KEYS_PATH", ""))
kms_master_key_path = Path(app.config.get("ENCRYPTION_MASTER_KEY_PATH", ""))
kms_manager = KMSManager(kms_keys_path, kms_master_key_path)
encryption_manager.set_kms_provider(kms_manager)
app.extensions["object_storage"] = storage
app.extensions["iam"] = iam
@@ -85,6 +102,8 @@ def create_app(
app.extensions["limiter"] = limiter
app.extensions["connections"] = connections
app.extensions["replication"] = replication
app.extensions["encryption"] = encryption_manager
app.extensions["kms"] = kms_manager
@app.errorhandler(500)
def internal_error(error):
@@ -119,9 +138,12 @@ def create_app(
if include_api:
from .s3_api import s3_api_bp
from .kms_api import kms_api_bp
app.register_blueprint(s3_api_bp)
app.register_blueprint(kms_api_bp)
csrf.exempt(s3_api_bp)
csrf.exempt(kms_api_bp)
if include_ui:
from .ui import ui_bp

25
app/config.py
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@@ -66,6 +66,11 @@ class AppConfig:
stream_chunk_size: int
multipart_min_part_size: int
bucket_stats_cache_ttl: int
encryption_enabled: bool
encryption_master_key_path: Path
kms_enabled: bool
kms_keys_path: Path
default_encryption_algorithm: str
@classmethod
def from_env(cls, overrides: Optional[Dict[str, Any]] = None) -> "AppConfig":
@@ -155,6 +160,14 @@ class AppConfig:
])
session_lifetime_days = int(_get("SESSION_LIFETIME_DAYS", 30))
bucket_stats_cache_ttl = int(_get("BUCKET_STATS_CACHE_TTL", 60)) # Default 60 seconds
# Encryption settings
encryption_enabled = str(_get("ENCRYPTION_ENABLED", "0")).lower() in {"1", "true", "yes", "on"}
encryption_keys_dir = storage_root / ".myfsio.sys" / "keys"
encryption_master_key_path = Path(_get("ENCRYPTION_MASTER_KEY_PATH", encryption_keys_dir / "master.key")).resolve()
kms_enabled = str(_get("KMS_ENABLED", "0")).lower() in {"1", "true", "yes", "on"}
kms_keys_path = Path(_get("KMS_KEYS_PATH", encryption_keys_dir / "kms_keys.json")).resolve()
default_encryption_algorithm = str(_get("DEFAULT_ENCRYPTION_ALGORITHM", "AES256"))
return cls(storage_root=storage_root,
max_upload_size=max_upload_size,
@@ -182,7 +195,12 @@ class AppConfig:
secret_ttl_seconds=secret_ttl_seconds,
stream_chunk_size=stream_chunk_size,
multipart_min_part_size=multipart_min_part_size,
bucket_stats_cache_ttl=bucket_stats_cache_ttl)
bucket_stats_cache_ttl=bucket_stats_cache_ttl,
encryption_enabled=encryption_enabled,
encryption_master_key_path=encryption_master_key_path,
kms_enabled=kms_enabled,
kms_keys_path=kms_keys_path,
default_encryption_algorithm=default_encryption_algorithm)
def to_flask_config(self) -> Dict[str, Any]:
return {
@@ -213,4 +231,9 @@ class AppConfig:
"CORS_METHODS": self.cors_methods,
"CORS_ALLOW_HEADERS": self.cors_allow_headers,
"SESSION_LIFETIME_DAYS": self.session_lifetime_days,
"ENCRYPTION_ENABLED": self.encryption_enabled,
"ENCRYPTION_MASTER_KEY_PATH": str(self.encryption_master_key_path),
"KMS_ENABLED": self.kms_enabled,
"KMS_KEYS_PATH": str(self.kms_keys_path),
"DEFAULT_ENCRYPTION_ALGORITHM": self.default_encryption_algorithm,
}

268
app/encrypted_storage.py Normal file
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@@ -0,0 +1,268 @@
"""Encrypted storage layer that wraps ObjectStorage with encryption support."""
from __future__ import annotations
import io
from pathlib import Path
from typing import Any, BinaryIO, Dict, Optional
from .encryption import EncryptionManager, EncryptionMetadata, EncryptionError
from .storage import ObjectStorage, ObjectMeta, StorageError
class EncryptedObjectStorage:
"""Object storage with transparent server-side encryption.
This class wraps ObjectStorage and provides transparent encryption/decryption
of objects based on bucket encryption configuration.
Encryption is applied when:
1. Bucket has default encryption configured (SSE-S3 or SSE-KMS)
2. Client explicitly requests encryption via headers
The encryption metadata is stored alongside object metadata.
"""
STREAMING_THRESHOLD = 64 * 1024
def __init__(self, storage: ObjectStorage, encryption_manager: EncryptionManager):
self.storage = storage
self.encryption = encryption_manager
@property
def root(self) -> Path:
return self.storage.root
def _should_encrypt(self, bucket_name: str,
server_side_encryption: str | None = None) -> tuple[bool, str, str | None]:
"""Determine if object should be encrypted.
Returns:
Tuple of (should_encrypt, algorithm, kms_key_id)
"""
if not self.encryption.enabled:
return False, "", None
if server_side_encryption:
if server_side_encryption == "AES256":
return True, "AES256", None
elif server_side_encryption.startswith("aws:kms"):
parts = server_side_encryption.split(":")
kms_key_id = parts[2] if len(parts) > 2 else None
return True, "aws:kms", kms_key_id
try:
encryption_config = self.storage.get_bucket_encryption(bucket_name)
if encryption_config and encryption_config.get("Rules"):
rule = encryption_config["Rules"][0]
algorithm = rule.get("SSEAlgorithm", "AES256")
kms_key_id = rule.get("KMSMasterKeyID")
return True, algorithm, kms_key_id
except StorageError:
pass
return False, "", None
def _is_encrypted(self, metadata: Dict[str, str]) -> bool:
"""Check if object is encrypted based on its metadata."""
return "x-amz-server-side-encryption" in metadata
def put_object(
self,
bucket_name: str,
object_key: str,
stream: BinaryIO,
*,
metadata: Optional[Dict[str, str]] = None,
server_side_encryption: Optional[str] = None,
kms_key_id: Optional[str] = None,
) -> ObjectMeta:
"""Store an object, optionally with encryption.
Args:
bucket_name: Name of the bucket
object_key: Key for the object
stream: Binary stream of object data
metadata: Optional user metadata
server_side_encryption: Encryption algorithm ("AES256" or "aws:kms")
kms_key_id: KMS key ID (for aws:kms encryption)
Returns:
ObjectMeta with object information
"""
should_encrypt, algorithm, detected_kms_key = self._should_encrypt(
bucket_name, server_side_encryption
)
if kms_key_id is None:
kms_key_id = detected_kms_key
if should_encrypt:
data = stream.read()
try:
ciphertext, enc_metadata = self.encryption.encrypt_object(
data,
algorithm=algorithm,
kms_key_id=kms_key_id,
context={"bucket": bucket_name, "key": object_key},
)
combined_metadata = metadata.copy() if metadata else {}
combined_metadata.update(enc_metadata.to_dict())
encrypted_stream = io.BytesIO(ciphertext)
result = self.storage.put_object(
bucket_name,
object_key,
encrypted_stream,
metadata=combined_metadata,
)
result.metadata = combined_metadata
return result
except EncryptionError as exc:
raise StorageError(f"Encryption failed: {exc}") from exc
else:
return self.storage.put_object(
bucket_name,
object_key,
stream,
metadata=metadata,
)
def get_object_data(self, bucket_name: str, object_key: str) -> tuple[bytes, Dict[str, str]]:
"""Get object data, decrypting if necessary.
Returns:
Tuple of (data, metadata)
"""
path = self.storage.get_object_path(bucket_name, object_key)
metadata = self.storage.get_object_metadata(bucket_name, object_key)
with path.open("rb") as f:
data = f.read()
enc_metadata = EncryptionMetadata.from_dict(metadata)
if enc_metadata:
try:
data = self.encryption.decrypt_object(
data,
enc_metadata,
context={"bucket": bucket_name, "key": object_key},
)
except EncryptionError as exc:
raise StorageError(f"Decryption failed: {exc}") from exc
clean_metadata = {
k: v for k, v in metadata.items()
if not k.startswith("x-amz-encryption")
and k != "x-amz-encrypted-data-key"
}
return data, clean_metadata
def get_object_stream(self, bucket_name: str, object_key: str) -> tuple[BinaryIO, Dict[str, str], int]:
"""Get object as a stream, decrypting if necessary.
Returns:
Tuple of (stream, metadata, original_size)
"""
data, metadata = self.get_object_data(bucket_name, object_key)
return io.BytesIO(data), metadata, len(data)
def list_buckets(self):
return self.storage.list_buckets()
def bucket_exists(self, bucket_name: str) -> bool:
return self.storage.bucket_exists(bucket_name)
def create_bucket(self, bucket_name: str) -> None:
return self.storage.create_bucket(bucket_name)
def delete_bucket(self, bucket_name: str) -> None:
return self.storage.delete_bucket(bucket_name)
def bucket_stats(self, bucket_name: str, cache_ttl: int = 60):
return self.storage.bucket_stats(bucket_name, cache_ttl)
def list_objects(self, bucket_name: str):
return self.storage.list_objects(bucket_name)
def get_object_path(self, bucket_name: str, object_key: str):
return self.storage.get_object_path(bucket_name, object_key)
def get_object_metadata(self, bucket_name: str, object_key: str):
return self.storage.get_object_metadata(bucket_name, object_key)
def delete_object(self, bucket_name: str, object_key: str) -> None:
return self.storage.delete_object(bucket_name, object_key)
def purge_object(self, bucket_name: str, object_key: str) -> None:
return self.storage.purge_object(bucket_name, object_key)
def is_versioning_enabled(self, bucket_name: str) -> bool:
return self.storage.is_versioning_enabled(bucket_name)
def set_bucket_versioning(self, bucket_name: str, enabled: bool) -> None:
return self.storage.set_bucket_versioning(bucket_name, enabled)
def get_bucket_tags(self, bucket_name: str):
return self.storage.get_bucket_tags(bucket_name)
def set_bucket_tags(self, bucket_name: str, tags):
return self.storage.set_bucket_tags(bucket_name, tags)
def get_bucket_cors(self, bucket_name: str):
return self.storage.get_bucket_cors(bucket_name)
def set_bucket_cors(self, bucket_name: str, rules):
return self.storage.set_bucket_cors(bucket_name, rules)
def get_bucket_encryption(self, bucket_name: str):
return self.storage.get_bucket_encryption(bucket_name)
def set_bucket_encryption(self, bucket_name: str, config_payload):
return self.storage.set_bucket_encryption(bucket_name, config_payload)
def get_bucket_lifecycle(self, bucket_name: str):
return self.storage.get_bucket_lifecycle(bucket_name)
def set_bucket_lifecycle(self, bucket_name: str, rules):
return self.storage.set_bucket_lifecycle(bucket_name, rules)
def get_object_tags(self, bucket_name: str, object_key: str):
return self.storage.get_object_tags(bucket_name, object_key)
def set_object_tags(self, bucket_name: str, object_key: str, tags):
return self.storage.set_object_tags(bucket_name, object_key, tags)
def delete_object_tags(self, bucket_name: str, object_key: str):
return self.storage.delete_object_tags(bucket_name, object_key)
def list_object_versions(self, bucket_name: str, object_key: str):
return self.storage.list_object_versions(bucket_name, object_key)
def restore_object_version(self, bucket_name: str, object_key: str, version_id: str):
return self.storage.restore_object_version(bucket_name, object_key, version_id)
def list_orphaned_objects(self, bucket_name: str):
return self.storage.list_orphaned_objects(bucket_name)
def initiate_multipart_upload(self, bucket_name: str, object_key: str, *, metadata=None) -> str:
return self.storage.initiate_multipart_upload(bucket_name, object_key, metadata=metadata)
def upload_multipart_part(self, bucket_name: str, upload_id: str, part_number: int, stream: BinaryIO) -> str:
return self.storage.upload_multipart_part(bucket_name, upload_id, part_number, stream)
def complete_multipart_upload(self, bucket_name: str, upload_id: str, ordered_parts):
return self.storage.complete_multipart_upload(bucket_name, upload_id, ordered_parts)
def abort_multipart_upload(self, bucket_name: str, upload_id: str) -> None:
return self.storage.abort_multipart_upload(bucket_name, upload_id)
def list_multipart_parts(self, bucket_name: str, upload_id: str):
return self.storage.list_multipart_parts(bucket_name, upload_id)
def _compute_etag(self, path: Path) -> str:
return self.storage._compute_etag(path)

395
app/encryption.py Normal file
View File

@@ -0,0 +1,395 @@
"""Encryption providers for server-side and client-side encryption."""
from __future__ import annotations
import base64
import io
import json
import secrets
from dataclasses import dataclass
from pathlib import Path
from typing import Any, BinaryIO, Dict, Generator, Optional
from cryptography.hazmat.primitives.ciphers.aead import AESGCM
class EncryptionError(Exception):
"""Raised when encryption/decryption fails."""
@dataclass
class EncryptionResult:
"""Result of encrypting data."""
ciphertext: bytes
nonce: bytes
key_id: str
encrypted_data_key: bytes
@dataclass
class EncryptionMetadata:
"""Metadata stored with encrypted objects."""
algorithm: str
key_id: str
nonce: bytes
encrypted_data_key: bytes
def to_dict(self) -> Dict[str, str]:
return {
"x-amz-server-side-encryption": self.algorithm,
"x-amz-encryption-key-id": self.key_id,
"x-amz-encryption-nonce": base64.b64encode(self.nonce).decode(),
"x-amz-encrypted-data-key": base64.b64encode(self.encrypted_data_key).decode(),
}
@classmethod
def from_dict(cls, data: Dict[str, str]) -> Optional["EncryptionMetadata"]:
algorithm = data.get("x-amz-server-side-encryption")
if not algorithm:
return None
try:
return cls(
algorithm=algorithm,
key_id=data.get("x-amz-encryption-key-id", "local"),
nonce=base64.b64decode(data.get("x-amz-encryption-nonce", "")),
encrypted_data_key=base64.b64decode(data.get("x-amz-encrypted-data-key", "")),
)
except Exception:
return None
class EncryptionProvider:
"""Base class for encryption providers."""
def encrypt(self, plaintext: bytes, context: Dict[str, str] | None = None) -> EncryptionResult:
raise NotImplementedError
def decrypt(self, ciphertext: bytes, nonce: bytes, encrypted_data_key: bytes,
key_id: str, context: Dict[str, str] | None = None) -> bytes:
raise NotImplementedError
def generate_data_key(self) -> tuple[bytes, bytes]:
"""Generate a data key and its encrypted form.
Returns:
Tuple of (plaintext_key, encrypted_key)
"""
raise NotImplementedError
class LocalKeyEncryption(EncryptionProvider):
"""SSE-S3 style encryption using a local master key.
Uses envelope encryption:
1. Generate a unique data key for each object
2. Encrypt the data with the data key (AES-256-GCM)
3. Encrypt the data key with the master key
4. Store the encrypted data key alongside the ciphertext
"""
KEY_ID = "local"
def __init__(self, master_key_path: Path):
self.master_key_path = master_key_path
self._master_key: bytes | None = None
@property
def master_key(self) -> bytes:
if self._master_key is None:
self._master_key = self._load_or_create_master_key()
return self._master_key
def _load_or_create_master_key(self) -> bytes:
"""Load master key from file or generate a new one."""
if self.master_key_path.exists():
try:
return base64.b64decode(self.master_key_path.read_text().strip())
except Exception as exc:
raise EncryptionError(f"Failed to load master key: {exc}") from exc
key = secrets.token_bytes(32)
try:
self.master_key_path.parent.mkdir(parents=True, exist_ok=True)
self.master_key_path.write_text(base64.b64encode(key).decode())
except OSError as exc:
raise EncryptionError(f"Failed to save master key: {exc}") from exc
return key
def _encrypt_data_key(self, data_key: bytes) -> bytes:
"""Encrypt the data key with the master key."""
aesgcm = AESGCM(self.master_key)
nonce = secrets.token_bytes(12)
encrypted = aesgcm.encrypt(nonce, data_key, None)
return nonce + encrypted
def _decrypt_data_key(self, encrypted_data_key: bytes) -> bytes:
"""Decrypt the data key using the master key."""
if len(encrypted_data_key) < 12 + 32 + 16: # nonce + key + tag
raise EncryptionError("Invalid encrypted data key")
aesgcm = AESGCM(self.master_key)
nonce = encrypted_data_key[:12]
ciphertext = encrypted_data_key[12:]
try:
return aesgcm.decrypt(nonce, ciphertext, None)
except Exception as exc:
raise EncryptionError(f"Failed to decrypt data key: {exc}") from exc
def generate_data_key(self) -> tuple[bytes, bytes]:
"""Generate a data key and its encrypted form."""
plaintext_key = secrets.token_bytes(32)
encrypted_key = self._encrypt_data_key(plaintext_key)
return plaintext_key, encrypted_key
def encrypt(self, plaintext: bytes, context: Dict[str, str] | None = None) -> EncryptionResult:
"""Encrypt data using envelope encryption."""
data_key, encrypted_data_key = self.generate_data_key()
aesgcm = AESGCM(data_key)
nonce = secrets.token_bytes(12)
ciphertext = aesgcm.encrypt(nonce, plaintext, None)
return EncryptionResult(
ciphertext=ciphertext,
nonce=nonce,
key_id=self.KEY_ID,
encrypted_data_key=encrypted_data_key,
)
def decrypt(self, ciphertext: bytes, nonce: bytes, encrypted_data_key: bytes,
key_id: str, context: Dict[str, str] | None = None) -> bytes:
"""Decrypt data using envelope encryption."""
# Decrypt the data key
data_key = self._decrypt_data_key(encrypted_data_key)
# Decrypt the data
aesgcm = AESGCM(data_key)
try:
return aesgcm.decrypt(nonce, ciphertext, None)
except Exception as exc:
raise EncryptionError(f"Failed to decrypt data: {exc}") from exc
class StreamingEncryptor:
"""Encrypts/decrypts data in streaming fashion for large files.
For large files, we encrypt in chunks. Each chunk is encrypted with the
same data key but a unique nonce derived from the base nonce + chunk index.
"""
CHUNK_SIZE = 64 * 1024
HEADER_SIZE = 4
def __init__(self, provider: EncryptionProvider, chunk_size: int = CHUNK_SIZE):
self.provider = provider
self.chunk_size = chunk_size
def _derive_chunk_nonce(self, base_nonce: bytes, chunk_index: int) -> bytes:
"""Derive a unique nonce for each chunk."""
# XOR the base nonce with the chunk index
nonce_int = int.from_bytes(base_nonce, "big")
derived = nonce_int ^ chunk_index
return derived.to_bytes(12, "big")
def encrypt_stream(self, stream: BinaryIO,
context: Dict[str, str] | None = None) -> tuple[BinaryIO, EncryptionMetadata]:
"""Encrypt a stream and return encrypted stream + metadata."""
data_key, encrypted_data_key = self.provider.generate_data_key()
base_nonce = secrets.token_bytes(12)
aesgcm = AESGCM(data_key)
encrypted_chunks = []
chunk_index = 0
while True:
chunk = stream.read(self.chunk_size)
if not chunk:
break
chunk_nonce = self._derive_chunk_nonce(base_nonce, chunk_index)
encrypted_chunk = aesgcm.encrypt(chunk_nonce, chunk, None)
size_prefix = len(encrypted_chunk).to_bytes(self.HEADER_SIZE, "big")
encrypted_chunks.append(size_prefix + encrypted_chunk)
chunk_index += 1
header = chunk_index.to_bytes(4, "big")
encrypted_data = header + b"".join(encrypted_chunks)
metadata = EncryptionMetadata(
algorithm="AES256",
key_id=self.provider.KEY_ID if hasattr(self.provider, "KEY_ID") else "local",
nonce=base_nonce,
encrypted_data_key=encrypted_data_key,
)
return io.BytesIO(encrypted_data), metadata
def decrypt_stream(self, stream: BinaryIO, metadata: EncryptionMetadata) -> BinaryIO:
"""Decrypt a stream using the provided metadata."""
if isinstance(self.provider, LocalKeyEncryption):
data_key = self.provider._decrypt_data_key(metadata.encrypted_data_key)
else:
raise EncryptionError("Unsupported provider for streaming decryption")
aesgcm = AESGCM(data_key)
base_nonce = metadata.nonce
chunk_count_bytes = stream.read(4)
if len(chunk_count_bytes) < 4:
raise EncryptionError("Invalid encrypted stream: missing header")
chunk_count = int.from_bytes(chunk_count_bytes, "big")
decrypted_chunks = []
for chunk_index in range(chunk_count):
size_bytes = stream.read(self.HEADER_SIZE)
if len(size_bytes) < self.HEADER_SIZE:
raise EncryptionError(f"Invalid encrypted stream: truncated at chunk {chunk_index}")
chunk_size = int.from_bytes(size_bytes, "big")
encrypted_chunk = stream.read(chunk_size)
if len(encrypted_chunk) < chunk_size:
raise EncryptionError(f"Invalid encrypted stream: incomplete chunk {chunk_index}")
chunk_nonce = self._derive_chunk_nonce(base_nonce, chunk_index)
try:
decrypted_chunk = aesgcm.decrypt(chunk_nonce, encrypted_chunk, None)
decrypted_chunks.append(decrypted_chunk)
except Exception as exc:
raise EncryptionError(f"Failed to decrypt chunk {chunk_index}: {exc}") from exc
return io.BytesIO(b"".join(decrypted_chunks))
class EncryptionManager:
"""Manages encryption providers and operations."""
def __init__(self, config: Dict[str, Any]):
self.config = config
self._local_provider: LocalKeyEncryption | None = None
self._kms_provider: Any = None # Set by KMS module
self._streaming_encryptor: StreamingEncryptor | None = None
@property
def enabled(self) -> bool:
return self.config.get("encryption_enabled", False)
@property
def default_algorithm(self) -> str:
return self.config.get("default_encryption_algorithm", "AES256")
def get_local_provider(self) -> LocalKeyEncryption:
if self._local_provider is None:
key_path = Path(self.config.get("encryption_master_key_path", "data/.myfsio.sys/keys/master.key"))
self._local_provider = LocalKeyEncryption(key_path)
return self._local_provider
def set_kms_provider(self, kms_provider: Any) -> None:
"""Set the KMS provider (injected from kms module)."""
self._kms_provider = kms_provider
def get_provider(self, algorithm: str, kms_key_id: str | None = None) -> EncryptionProvider:
"""Get the appropriate encryption provider for the algorithm."""
if algorithm == "AES256":
return self.get_local_provider()
elif algorithm == "aws:kms":
if self._kms_provider is None:
raise EncryptionError("KMS is not configured")
return self._kms_provider.get_provider(kms_key_id)
else:
raise EncryptionError(f"Unsupported encryption algorithm: {algorithm}")
def get_streaming_encryptor(self) -> StreamingEncryptor:
if self._streaming_encryptor is None:
self._streaming_encryptor = StreamingEncryptor(self.get_local_provider())
return self._streaming_encryptor
def encrypt_object(self, data: bytes, algorithm: str = "AES256",
kms_key_id: str | None = None,
context: Dict[str, str] | None = None) -> tuple[bytes, EncryptionMetadata]:
"""Encrypt object data."""
provider = self.get_provider(algorithm, kms_key_id)
result = provider.encrypt(data, context)
metadata = EncryptionMetadata(
algorithm=algorithm,
key_id=result.key_id,
nonce=result.nonce,
encrypted_data_key=result.encrypted_data_key,
)
return result.ciphertext, metadata
def decrypt_object(self, ciphertext: bytes, metadata: EncryptionMetadata,
context: Dict[str, str] | None = None) -> bytes:
"""Decrypt object data."""
provider = self.get_provider(metadata.algorithm, metadata.key_id)
return provider.decrypt(
ciphertext,
metadata.nonce,
metadata.encrypted_data_key,
metadata.key_id,
context,
)
def encrypt_stream(self, stream: BinaryIO, algorithm: str = "AES256",
context: Dict[str, str] | None = None) -> tuple[BinaryIO, EncryptionMetadata]:
"""Encrypt a stream for large files."""
encryptor = self.get_streaming_encryptor()
return encryptor.encrypt_stream(stream, context)
def decrypt_stream(self, stream: BinaryIO, metadata: EncryptionMetadata) -> BinaryIO:
"""Decrypt a stream."""
encryptor = self.get_streaming_encryptor()
return encryptor.decrypt_stream(stream, metadata)
class ClientEncryptionHelper:
"""Helpers for client-side encryption.
Client-side encryption is performed by the client, but this helper
provides key generation and materials for clients that need them.
"""
@staticmethod
def generate_client_key() -> Dict[str, str]:
"""Generate a new client encryption key."""
from datetime import datetime, timezone
key = secrets.token_bytes(32)
return {
"key": base64.b64encode(key).decode(),
"algorithm": "AES-256-GCM",
"created_at": datetime.now(timezone.utc).isoformat(),
}
@staticmethod
def encrypt_with_key(plaintext: bytes, key_b64: str) -> Dict[str, str]:
"""Encrypt data with a client-provided key."""
key = base64.b64decode(key_b64)
if len(key) != 32:
raise EncryptionError("Key must be 256 bits (32 bytes)")
aesgcm = AESGCM(key)
nonce = secrets.token_bytes(12)
ciphertext = aesgcm.encrypt(nonce, plaintext, None)
return {
"ciphertext": base64.b64encode(ciphertext).decode(),
"nonce": base64.b64encode(nonce).decode(),
"algorithm": "AES-256-GCM",
}
@staticmethod
def decrypt_with_key(ciphertext_b64: str, nonce_b64: str, key_b64: str) -> bytes:
"""Decrypt data with a client-provided key."""
key = base64.b64decode(key_b64)
nonce = base64.b64decode(nonce_b64)
ciphertext = base64.b64decode(ciphertext_b64)
if len(key) != 32:
raise EncryptionError("Key must be 256 bits (32 bytes)")
aesgcm = AESGCM(key)
try:
return aesgcm.decrypt(nonce, ciphertext, None)
except Exception as exc:
raise EncryptionError(f"Decryption failed: {exc}") from exc

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"""Key Management Service (KMS) for encryption key management."""
from __future__ import annotations
import base64
import json
import secrets
import uuid
from dataclasses import dataclass, field
from datetime import datetime, timezone
from pathlib import Path
from typing import Any, Dict, List, Optional
from cryptography.hazmat.primitives.ciphers.aead import AESGCM
from .encryption import EncryptionError, EncryptionProvider, EncryptionResult
@dataclass
class KMSKey:
"""Represents a KMS encryption key."""
key_id: str
description: str
created_at: str
enabled: bool = True
key_material: bytes = field(default_factory=lambda: b"", repr=False)
@property
def arn(self) -> str:
return f"arn:aws:kms:local:000000000000:key/{self.key_id}"
def to_dict(self, include_key: bool = False) -> Dict[str, Any]:
data = {
"KeyId": self.key_id,
"Arn": self.arn,
"Description": self.description,
"CreationDate": self.created_at,
"Enabled": self.enabled,
"KeyState": "Enabled" if self.enabled else "Disabled",
"KeyUsage": "ENCRYPT_DECRYPT",
"KeySpec": "SYMMETRIC_DEFAULT",
}
if include_key:
data["KeyMaterial"] = base64.b64encode(self.key_material).decode()
return data
@classmethod
def from_dict(cls, data: Dict[str, Any]) -> "KMSKey":
key_material = b""
if "KeyMaterial" in data:
key_material = base64.b64decode(data["KeyMaterial"])
return cls(
key_id=data["KeyId"],
description=data.get("Description", ""),
created_at=data.get("CreationDate", datetime.now(timezone.utc).isoformat()),
enabled=data.get("Enabled", True),
key_material=key_material,
)
class KMSEncryptionProvider(EncryptionProvider):
"""Encryption provider using a specific KMS key."""
def __init__(self, kms: "KMSManager", key_id: str):
self.kms = kms
self.key_id = key_id
@property
def KEY_ID(self) -> str:
return self.key_id
def generate_data_key(self) -> tuple[bytes, bytes]:
"""Generate a data key encrypted with the KMS key."""
return self.kms.generate_data_key(self.key_id)
def encrypt(self, plaintext: bytes, context: Dict[str, str] | None = None) -> EncryptionResult:
"""Encrypt data using envelope encryption with KMS."""
data_key, encrypted_data_key = self.generate_data_key()
aesgcm = AESGCM(data_key)
nonce = secrets.token_bytes(12)
ciphertext = aesgcm.encrypt(nonce, plaintext,
json.dumps(context).encode() if context else None)
return EncryptionResult(
ciphertext=ciphertext,
nonce=nonce,
key_id=self.key_id,
encrypted_data_key=encrypted_data_key,
)
def decrypt(self, ciphertext: bytes, nonce: bytes, encrypted_data_key: bytes,
key_id: str, context: Dict[str, str] | None = None) -> bytes:
"""Decrypt data using envelope encryption with KMS."""
data_key = self.kms.decrypt_data_key(key_id, encrypted_data_key, context)
aesgcm = AESGCM(data_key)
try:
return aesgcm.decrypt(nonce, ciphertext,
json.dumps(context).encode() if context else None)
except Exception as exc:
raise EncryptionError(f"Failed to decrypt data: {exc}") from exc
class KMSManager:
"""Manages KMS keys and operations.
This is a local implementation that mimics AWS KMS functionality.
Keys are stored encrypted on disk.
"""
def __init__(self, keys_path: Path, master_key_path: Path):
self.keys_path = keys_path
self.master_key_path = master_key_path
self._keys: Dict[str, KMSKey] = {}
self._master_key: bytes | None = None
self._loaded = False
@property
def master_key(self) -> bytes:
"""Load or create the master key for encrypting KMS keys."""
if self._master_key is None:
if self.master_key_path.exists():
self._master_key = base64.b64decode(
self.master_key_path.read_text().strip()
)
else:
self._master_key = secrets.token_bytes(32)
self.master_key_path.parent.mkdir(parents=True, exist_ok=True)
self.master_key_path.write_text(
base64.b64encode(self._master_key).decode()
)
return self._master_key
def _load_keys(self) -> None:
"""Load keys from disk."""
if self._loaded:
return
if self.keys_path.exists():
try:
data = json.loads(self.keys_path.read_text(encoding="utf-8"))
for key_data in data.get("keys", []):
key = KMSKey.from_dict(key_data)
if key_data.get("EncryptedKeyMaterial"):
encrypted = base64.b64decode(key_data["EncryptedKeyMaterial"])
key.key_material = self._decrypt_key_material(encrypted)
self._keys[key.key_id] = key
except Exception:
pass
self._loaded = True
def _save_keys(self) -> None:
"""Save keys to disk (with encrypted key material)."""
keys_data = []
for key in self._keys.values():
data = key.to_dict(include_key=False)
encrypted = self._encrypt_key_material(key.key_material)
data["EncryptedKeyMaterial"] = base64.b64encode(encrypted).decode()
keys_data.append(data)
self.keys_path.parent.mkdir(parents=True, exist_ok=True)
self.keys_path.write_text(
json.dumps({"keys": keys_data}, indent=2),
encoding="utf-8"
)
def _encrypt_key_material(self, key_material: bytes) -> bytes:
"""Encrypt key material with the master key."""
aesgcm = AESGCM(self.master_key)
nonce = secrets.token_bytes(12)
ciphertext = aesgcm.encrypt(nonce, key_material, None)
return nonce + ciphertext
def _decrypt_key_material(self, encrypted: bytes) -> bytes:
"""Decrypt key material with the master key."""
aesgcm = AESGCM(self.master_key)
nonce = encrypted[:12]
ciphertext = encrypted[12:]
return aesgcm.decrypt(nonce, ciphertext, None)
def create_key(self, description: str = "", key_id: str | None = None) -> KMSKey:
"""Create a new KMS key."""
self._load_keys()
if key_id is None:
key_id = str(uuid.uuid4())
if key_id in self._keys:
raise EncryptionError(f"Key already exists: {key_id}")
key = KMSKey(
key_id=key_id,
description=description,
created_at=datetime.now(timezone.utc).isoformat(),
enabled=True,
key_material=secrets.token_bytes(32),
)
self._keys[key_id] = key
self._save_keys()
return key
def get_key(self, key_id: str) -> KMSKey | None:
"""Get a key by ID."""
self._load_keys()
return self._keys.get(key_id)
def list_keys(self) -> List[KMSKey]:
"""List all keys."""
self._load_keys()
return list(self._keys.values())
def enable_key(self, key_id: str) -> None:
"""Enable a key."""
self._load_keys()
key = self._keys.get(key_id)
if not key:
raise EncryptionError(f"Key not found: {key_id}")
key.enabled = True
self._save_keys()
def disable_key(self, key_id: str) -> None:
"""Disable a key."""
self._load_keys()
key = self._keys.get(key_id)
if not key:
raise EncryptionError(f"Key not found: {key_id}")
key.enabled = False
self._save_keys()
def delete_key(self, key_id: str) -> None:
"""Delete a key (schedule for deletion in real KMS)."""
self._load_keys()
if key_id not in self._keys:
raise EncryptionError(f"Key not found: {key_id}")
del self._keys[key_id]
self._save_keys()
def encrypt(self, key_id: str, plaintext: bytes,
context: Dict[str, str] | None = None) -> bytes:
"""Encrypt data directly with a KMS key."""
self._load_keys()
key = self._keys.get(key_id)
if not key:
raise EncryptionError(f"Key not found: {key_id}")
if not key.enabled:
raise EncryptionError(f"Key is disabled: {key_id}")
aesgcm = AESGCM(key.key_material)
nonce = secrets.token_bytes(12)
aad = json.dumps(context).encode() if context else None
ciphertext = aesgcm.encrypt(nonce, plaintext, aad)
key_id_bytes = key_id.encode("utf-8")
return len(key_id_bytes).to_bytes(2, "big") + key_id_bytes + nonce + ciphertext
def decrypt(self, ciphertext: bytes,
context: Dict[str, str] | None = None) -> tuple[bytes, str]:
"""Decrypt data directly with a KMS key.
Returns:
Tuple of (plaintext, key_id)
"""
self._load_keys()
key_id_len = int.from_bytes(ciphertext[:2], "big")
key_id = ciphertext[2:2 + key_id_len].decode("utf-8")
rest = ciphertext[2 + key_id_len:]
key = self._keys.get(key_id)
if not key:
raise EncryptionError(f"Key not found: {key_id}")
if not key.enabled:
raise EncryptionError(f"Key is disabled: {key_id}")
nonce = rest[:12]
encrypted = rest[12:]
aesgcm = AESGCM(key.key_material)
aad = json.dumps(context).encode() if context else None
try:
plaintext = aesgcm.decrypt(nonce, encrypted, aad)
return plaintext, key_id
except Exception as exc:
raise EncryptionError(f"Decryption failed: {exc}") from exc
def generate_data_key(self, key_id: str,
context: Dict[str, str] | None = None) -> tuple[bytes, bytes]:
"""Generate a data key and return both plaintext and encrypted versions.
Returns:
Tuple of (plaintext_key, encrypted_key)
"""
self._load_keys()
key = self._keys.get(key_id)
if not key:
raise EncryptionError(f"Key not found: {key_id}")
if not key.enabled:
raise EncryptionError(f"Key is disabled: {key_id}")
plaintext_key = secrets.token_bytes(32)
encrypted_key = self.encrypt(key_id, plaintext_key, context)
return plaintext_key, encrypted_key
def decrypt_data_key(self, key_id: str, encrypted_key: bytes,
context: Dict[str, str] | None = None) -> bytes:
"""Decrypt a data key."""
plaintext, _ = self.decrypt(encrypted_key, context)
return plaintext
def get_provider(self, key_id: str | None = None) -> KMSEncryptionProvider:
"""Get an encryption provider for a specific key."""
self._load_keys()
if key_id is None:
if not self._keys:
key = self.create_key("Default KMS Key")
key_id = key.key_id
else:
key_id = next(iter(self._keys.keys()))
if key_id not in self._keys:
raise EncryptionError(f"Key not found: {key_id}")
return KMSEncryptionProvider(self, key_id)
def re_encrypt(self, ciphertext: bytes, destination_key_id: str,
source_context: Dict[str, str] | None = None,
destination_context: Dict[str, str] | None = None) -> bytes:
"""Re-encrypt data with a different key."""
plaintext, source_key_id = self.decrypt(ciphertext, source_context)
return self.encrypt(destination_key_id, plaintext, destination_context)
def generate_random(self, num_bytes: int = 32) -> bytes:
"""Generate cryptographically secure random bytes."""
if num_bytes < 1 or num_bytes > 1024:
raise EncryptionError("Number of bytes must be between 1 and 1024")
return secrets.token_bytes(num_bytes)

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"""KMS and encryption API endpoints."""
from __future__ import annotations
import base64
import uuid
from typing import Any, Dict
from flask import Blueprint, Response, current_app, jsonify, request
from .encryption import ClientEncryptionHelper, EncryptionError
from .extensions import limiter
from .iam import IamError
kms_api_bp = Blueprint("kms_api", __name__, url_prefix="/kms")
def _require_principal():
"""Require authentication for KMS operations."""
from .s3_api import _require_principal as s3_require_principal
return s3_require_principal()
def _kms():
"""Get KMS manager from app extensions."""
return current_app.extensions.get("kms")
def _encryption():
"""Get encryption manager from app extensions."""
return current_app.extensions.get("encryption")
def _error_response(code: str, message: str, status: int) -> tuple[Dict[str, Any], int]:
return {"__type": code, "message": message}, status
# ---------------------- Key Management ----------------------
@kms_api_bp.route("/keys", methods=["GET", "POST"])
@limiter.limit("30 per minute")
def list_or_create_keys():
"""List all KMS keys or create a new key."""
principal, error = _require_principal()
if error:
return error
kms = _kms()
if not kms:
return _error_response("KMSNotEnabled", "KMS is not configured", 400)
if request.method == "POST":
payload = request.get_json(silent=True) or {}
key_id = payload.get("KeyId") or payload.get("key_id")
description = payload.get("Description") or payload.get("description", "")
try:
key = kms.create_key(description=description, key_id=key_id)
current_app.logger.info(
"KMS key created",
extra={"key_id": key.key_id, "principal": principal.access_key},
)
return jsonify({
"KeyMetadata": key.to_dict(),
})
except EncryptionError as exc:
return _error_response("KMSInternalException", str(exc), 400)
# GET - List keys
keys = kms.list_keys()
return jsonify({
"Keys": [{"KeyId": k.key_id, "KeyArn": k.arn} for k in keys],
"Truncated": False,
})
@kms_api_bp.route("/keys/<key_id>", methods=["GET", "DELETE"])
@limiter.limit("30 per minute")
def get_or_delete_key(key_id: str):
"""Get or delete a specific KMS key."""
principal, error = _require_principal()
if error:
return error
kms = _kms()
if not kms:
return _error_response("KMSNotEnabled", "KMS is not configured", 400)
if request.method == "DELETE":
try:
kms.delete_key(key_id)
current_app.logger.info(
"KMS key deleted",
extra={"key_id": key_id, "principal": principal.access_key},
)
return Response(status=204)
except EncryptionError as exc:
return _error_response("NotFoundException", str(exc), 404)
# GET
key = kms.get_key(key_id)
if not key:
return _error_response("NotFoundException", f"Key not found: {key_id}", 404)
return jsonify({"KeyMetadata": key.to_dict()})
@kms_api_bp.route("/keys/<key_id>/enable", methods=["POST"])
@limiter.limit("30 per minute")
def enable_key(key_id: str):
"""Enable a KMS key."""
principal, error = _require_principal()
if error:
return error
kms = _kms()
if not kms:
return _error_response("KMSNotEnabled", "KMS is not configured", 400)
try:
kms.enable_key(key_id)
current_app.logger.info(
"KMS key enabled",
extra={"key_id": key_id, "principal": principal.access_key},
)
return Response(status=200)
except EncryptionError as exc:
return _error_response("NotFoundException", str(exc), 404)
@kms_api_bp.route("/keys/<key_id>/disable", methods=["POST"])
@limiter.limit("30 per minute")
def disable_key(key_id: str):
"""Disable a KMS key."""
principal, error = _require_principal()
if error:
return error
kms = _kms()
if not kms:
return _error_response("KMSNotEnabled", "KMS is not configured", 400)
try:
kms.disable_key(key_id)
current_app.logger.info(
"KMS key disabled",
extra={"key_id": key_id, "principal": principal.access_key},
)
return Response(status=200)
except EncryptionError as exc:
return _error_response("NotFoundException", str(exc), 404)
# ---------------------- Encryption Operations ----------------------
@kms_api_bp.route("/encrypt", methods=["POST"])
@limiter.limit("60 per minute")
def encrypt_data():
"""Encrypt data using a KMS key."""
principal, error = _require_principal()
if error:
return error
kms = _kms()
if not kms:
return _error_response("KMSNotEnabled", "KMS is not configured", 400)
payload = request.get_json(silent=True) or {}
key_id = payload.get("KeyId")
plaintext_b64 = payload.get("Plaintext")
context = payload.get("EncryptionContext")
if not key_id:
return _error_response("ValidationException", "KeyId is required", 400)
if not plaintext_b64:
return _error_response("ValidationException", "Plaintext is required", 400)
try:
plaintext = base64.b64decode(plaintext_b64)
except Exception:
return _error_response("ValidationException", "Plaintext must be base64 encoded", 400)
try:
ciphertext = kms.encrypt(key_id, plaintext, context)
return jsonify({
"CiphertextBlob": base64.b64encode(ciphertext).decode(),
"KeyId": key_id,
"EncryptionAlgorithm": "SYMMETRIC_DEFAULT",
})
except EncryptionError as exc:
return _error_response("KMSInternalException", str(exc), 400)
@kms_api_bp.route("/decrypt", methods=["POST"])
@limiter.limit("60 per minute")
def decrypt_data():
"""Decrypt data using a KMS key."""
principal, error = _require_principal()
if error:
return error
kms = _kms()
if not kms:
return _error_response("KMSNotEnabled", "KMS is not configured", 400)
payload = request.get_json(silent=True) or {}
ciphertext_b64 = payload.get("CiphertextBlob")
context = payload.get("EncryptionContext")
if not ciphertext_b64:
return _error_response("ValidationException", "CiphertextBlob is required", 400)
try:
ciphertext = base64.b64decode(ciphertext_b64)
except Exception:
return _error_response("ValidationException", "CiphertextBlob must be base64 encoded", 400)
try:
plaintext, key_id = kms.decrypt(ciphertext, context)
return jsonify({
"Plaintext": base64.b64encode(plaintext).decode(),
"KeyId": key_id,
"EncryptionAlgorithm": "SYMMETRIC_DEFAULT",
})
except EncryptionError as exc:
return _error_response("InvalidCiphertextException", str(exc), 400)
@kms_api_bp.route("/generate-data-key", methods=["POST"])
@limiter.limit("60 per minute")
def generate_data_key():
"""Generate a data encryption key."""
principal, error = _require_principal()
if error:
return error
kms = _kms()
if not kms:
return _error_response("KMSNotEnabled", "KMS is not configured", 400)
payload = request.get_json(silent=True) or {}
key_id = payload.get("KeyId")
context = payload.get("EncryptionContext")
key_spec = payload.get("KeySpec", "AES_256")
if not key_id:
return _error_response("ValidationException", "KeyId is required", 400)
if key_spec not in {"AES_256", "AES_128"}:
return _error_response("ValidationException", "KeySpec must be AES_256 or AES_128", 400)
try:
plaintext_key, encrypted_key = kms.generate_data_key(key_id, context)
# Trim key if AES_128 requested
if key_spec == "AES_128":
plaintext_key = plaintext_key[:16]
return jsonify({
"Plaintext": base64.b64encode(plaintext_key).decode(),
"CiphertextBlob": base64.b64encode(encrypted_key).decode(),
"KeyId": key_id,
})
except EncryptionError as exc:
return _error_response("KMSInternalException", str(exc), 400)
@kms_api_bp.route("/generate-data-key-without-plaintext", methods=["POST"])
@limiter.limit("60 per minute")
def generate_data_key_without_plaintext():
"""Generate a data encryption key without returning the plaintext."""
principal, error = _require_principal()
if error:
return error
kms = _kms()
if not kms:
return _error_response("KMSNotEnabled", "KMS is not configured", 400)
payload = request.get_json(silent=True) or {}
key_id = payload.get("KeyId")
context = payload.get("EncryptionContext")
if not key_id:
return _error_response("ValidationException", "KeyId is required", 400)
try:
_, encrypted_key = kms.generate_data_key(key_id, context)
return jsonify({
"CiphertextBlob": base64.b64encode(encrypted_key).decode(),
"KeyId": key_id,
})
except EncryptionError as exc:
return _error_response("KMSInternalException", str(exc), 400)
@kms_api_bp.route("/re-encrypt", methods=["POST"])
@limiter.limit("30 per minute")
def re_encrypt():
"""Re-encrypt data with a different key."""
principal, error = _require_principal()
if error:
return error
kms = _kms()
if not kms:
return _error_response("KMSNotEnabled", "KMS is not configured", 400)
payload = request.get_json(silent=True) or {}
ciphertext_b64 = payload.get("CiphertextBlob")
destination_key_id = payload.get("DestinationKeyId")
source_context = payload.get("SourceEncryptionContext")
destination_context = payload.get("DestinationEncryptionContext")
if not ciphertext_b64:
return _error_response("ValidationException", "CiphertextBlob is required", 400)
if not destination_key_id:
return _error_response("ValidationException", "DestinationKeyId is required", 400)
try:
ciphertext = base64.b64decode(ciphertext_b64)
except Exception:
return _error_response("ValidationException", "CiphertextBlob must be base64 encoded", 400)
try:
# First decrypt, get source key id
plaintext, source_key_id = kms.decrypt(ciphertext, source_context)
# Re-encrypt with destination key
new_ciphertext = kms.encrypt(destination_key_id, plaintext, destination_context)
return jsonify({
"CiphertextBlob": base64.b64encode(new_ciphertext).decode(),
"SourceKeyId": source_key_id,
"KeyId": destination_key_id,
})
except EncryptionError as exc:
return _error_response("KMSInternalException", str(exc), 400)
@kms_api_bp.route("/generate-random", methods=["POST"])
@limiter.limit("60 per minute")
def generate_random():
"""Generate random bytes."""
principal, error = _require_principal()
if error:
return error
kms = _kms()
if not kms:
return _error_response("KMSNotEnabled", "KMS is not configured", 400)
payload = request.get_json(silent=True) or {}
num_bytes = payload.get("NumberOfBytes", 32)
try:
num_bytes = int(num_bytes)
except (TypeError, ValueError):
return _error_response("ValidationException", "NumberOfBytes must be an integer", 400)
try:
random_bytes = kms.generate_random(num_bytes)
return jsonify({
"Plaintext": base64.b64encode(random_bytes).decode(),
})
except EncryptionError as exc:
return _error_response("ValidationException", str(exc), 400)
# ---------------------- Client-Side Encryption Helpers ----------------------
@kms_api_bp.route("/client/generate-key", methods=["POST"])
@limiter.limit("30 per minute")
def generate_client_key():
"""Generate a client-side encryption key."""
principal, error = _require_principal()
if error:
return error
key_info = ClientEncryptionHelper.generate_client_key()
return jsonify(key_info)
@kms_api_bp.route("/client/encrypt", methods=["POST"])
@limiter.limit("60 per minute")
def client_encrypt():
"""Encrypt data using client-side encryption."""
principal, error = _require_principal()
if error:
return error
payload = request.get_json(silent=True) or {}
plaintext_b64 = payload.get("Plaintext")
key_b64 = payload.get("Key")
if not plaintext_b64 or not key_b64:
return _error_response("ValidationException", "Plaintext and Key are required", 400)
try:
plaintext = base64.b64decode(plaintext_b64)
result = ClientEncryptionHelper.encrypt_with_key(plaintext, key_b64)
return jsonify(result)
except Exception as exc:
return _error_response("EncryptionError", str(exc), 400)
@kms_api_bp.route("/client/decrypt", methods=["POST"])
@limiter.limit("60 per minute")
def client_decrypt():
"""Decrypt data using client-side encryption."""
principal, error = _require_principal()
if error:
return error
payload = request.get_json(silent=True) or {}
ciphertext_b64 = payload.get("Ciphertext") or payload.get("ciphertext")
nonce_b64 = payload.get("Nonce") or payload.get("nonce")
key_b64 = payload.get("Key") or payload.get("key")
if not ciphertext_b64 or not nonce_b64 or not key_b64:
return _error_response("ValidationException", "Ciphertext, Nonce, and Key are required", 400)
try:
plaintext = ClientEncryptionHelper.decrypt_with_key(ciphertext_b64, nonce_b64, key_b64)
return jsonify({
"Plaintext": base64.b64encode(plaintext).decode(),
})
except Exception as exc:
return _error_response("DecryptionError", str(exc), 400)
# ---------------------- Encryption Materials for S3 Client-Side Encryption ----------------------
@kms_api_bp.route("/materials/<key_id>", methods=["POST"])
@limiter.limit("60 per minute")
def get_encryption_materials(key_id: str):
"""Get encryption materials for client-side S3 encryption.
This is used by S3 encryption clients that want to use KMS for
key management but perform encryption client-side.
"""
principal, error = _require_principal()
if error:
return error
kms = _kms()
if not kms:
return _error_response("KMSNotEnabled", "KMS is not configured", 400)
payload = request.get_json(silent=True) or {}
context = payload.get("EncryptionContext")
try:
plaintext_key, encrypted_key = kms.generate_data_key(key_id, context)
return jsonify({
"PlaintextKey": base64.b64encode(plaintext_key).decode(),
"EncryptedKey": base64.b64encode(encrypted_key).decode(),
"KeyId": key_id,
"Algorithm": "AES-256-GCM",
"KeyWrapAlgorithm": "kms",
})
except EncryptionError as exc:
return _error_response("KMSInternalException", str(exc), 400)

73
app/ui.py
View File

@@ -30,6 +30,7 @@ from .bucket_policies import BucketPolicyStore
from .connections import ConnectionStore, RemoteConnection
from .extensions import limiter
from .iam import IamError
from .kms import KMSManager
from .replication import ReplicationManager, ReplicationRule
from .secret_store import EphemeralSecretStore
from .storage import ObjectStorage, StorageError
@@ -50,6 +51,9 @@ def _iam():
return current_app.extensions["iam"]
def _kms() -> KMSManager | None:
return current_app.extensions.get("kms")
def _bucket_policies() -> BucketPolicyStore:
store: BucketPolicyStore = current_app.extensions["bucket_policies"]
@@ -360,6 +364,14 @@ def bucket_detail(bucket_name: str):
# Load connections for admin, or for non-admin if there's an existing rule (to show target name)
connections = _connections().list() if (is_replication_admin or replication_rule) else []
# Encryption settings
encryption_config = storage.get_bucket_encryption(bucket_name)
kms_manager = _kms()
kms_keys = kms_manager.list_keys() if kms_manager else []
kms_enabled = current_app.config.get("KMS_ENABLED", False)
encryption_enabled = current_app.config.get("ENCRYPTION_ENABLED", False)
can_manage_encryption = can_manage_versioning # Same as other bucket properties
return render_template(
"bucket_detail.html",
bucket_name=bucket_name,
@@ -370,11 +382,16 @@ def bucket_detail(bucket_name: str):
can_edit_policy=can_edit_policy,
can_manage_versioning=can_manage_versioning,
can_manage_replication=can_manage_replication,
can_manage_encryption=can_manage_encryption,
is_replication_admin=is_replication_admin,
default_policy=default_policy,
versioning_enabled=versioning_enabled,
replication_rule=replication_rule,
connections=connections,
encryption_config=encryption_config,
kms_keys=kms_keys,
kms_enabled=kms_enabled,
encryption_enabled=encryption_enabled,
)
@@ -878,6 +895,62 @@ def update_bucket_versioning(bucket_name: str):
return redirect(url_for("ui.bucket_detail", bucket_name=bucket_name, tab="properties"))
@ui_bp.post("/buckets/<bucket_name>/encryption")
def update_bucket_encryption(bucket_name: str):
"""Update bucket default encryption configuration."""
principal = _current_principal()
try:
_authorize_ui(principal, bucket_name, "write")
except IamError as exc:
flash(_friendly_error_message(exc), "danger")
return redirect(url_for("ui.bucket_detail", bucket_name=bucket_name, tab="properties"))
action = request.form.get("action", "enable")
if action == "disable":
# Disable encryption
try:
_storage().set_bucket_encryption(bucket_name, None)
flash("Default encryption disabled", "info")
except StorageError as exc:
flash(_friendly_error_message(exc), "danger")
return redirect(url_for("ui.bucket_detail", bucket_name=bucket_name, tab="properties"))
# Enable or update encryption
algorithm = request.form.get("algorithm", "AES256")
kms_key_id = request.form.get("kms_key_id", "").strip() or None
# Validate algorithm
if algorithm not in ("AES256", "aws:kms"):
flash("Invalid encryption algorithm", "danger")
return redirect(url_for("ui.bucket_detail", bucket_name=bucket_name, tab="properties"))
# Build encryption config following AWS format
encryption_config: dict[str, Any] = {
"Rules": [
{
"ApplyServerSideEncryptionByDefault": {
"SSEAlgorithm": algorithm,
}
}
]
}
if algorithm == "aws:kms" and kms_key_id:
encryption_config["Rules"][0]["ApplyServerSideEncryptionByDefault"]["KMSMasterKeyID"] = kms_key_id
try:
_storage().set_bucket_encryption(bucket_name, encryption_config)
if algorithm == "aws:kms":
flash("Default KMS encryption enabled", "success")
else:
flash("Default AES-256 encryption enabled", "success")
except StorageError as exc:
flash(_friendly_error_message(exc), "danger")
return redirect(url_for("ui.bucket_detail", bucket_name=bucket_name, tab="properties"))
@ui_bp.get("/iam")
def iam_dashboard():
principal = _current_principal()