Secrets encryption (#4)

Reviewed-on: #4
Co-authored-by: Ivan Golikov <root@ivnglkv.me>
Co-committed-by: Ivan Golikov <root@ivnglkv.me>

README.md

@@ -88,5 +88,8 @@ Configuration is done via environment variables.
 Environment variables:
 
 - `REDIS_URL`: URL for Redis access. Check what values are supported [here](https://redis.readthedocs.io/en/stable/connections.html#redis.Redis.from_url).
+- `SECRETS_ENCRYPTION_KEY`: Key used for encrypting stored data.
 
 You can also declare these variables in a `.env` file in the working directory.
+Protect this file (or other source from where `SECRETS_ENCRYPTION_KEY` is read by application)
+from being read by unauthorized parties.

poetry.lock

@@ -69,6 +69,85 @@ files = [
     {file = "certifi-2024.12.14.tar.gz", hash = "sha256:b650d30f370c2b724812bee08008be0c4163b163ddaec3f2546c1caf65f191db"},
 ]
 
+[[package]]
+name = "cffi"
+version = "1.17.1"
+description = "Foreign Function Interface for Python calling C code."
+optional = false
+python-versions = ">=3.8"
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+]
+
+[package.dependencies]
+pycparser = "*"
+
 [[package]]
 name = "click"
 version = "8.1.8"
@@ -94,6 +173,57 @@ files = [
     {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
 ]
 
+[[package]]
+name = "cryptography"
+version = "44.0.0"
+description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
+optional = false
+python-versions = "!=3.9.0,!=3.9.1,>=3.7"
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+    {file = "cryptography-44.0.0-cp39-abi3-musllinux_1_2_x86_64.whl", hash = "sha256:a01956ddfa0a6790d594f5b34fc1bfa6098aca434696a03cfdbe469b8ed79285"},
+    {file = "cryptography-44.0.0-cp39-abi3-win32.whl", hash = "sha256:eca27345e1214d1b9f9490d200f9db5a874479be914199194e746c893788d417"},
+    {file = "cryptography-44.0.0-cp39-abi3-win_amd64.whl", hash = "sha256:708ee5f1bafe76d041b53a4f95eb28cdeb8d18da17e597d46d7833ee59b97ede"},
+    {file = "cryptography-44.0.0-pp310-pypy310_pp73-macosx_10_9_x86_64.whl", hash = "sha256:37d76e6863da3774cd9db5b409a9ecfd2c71c981c38788d3fcfaf177f447b731"},
+    {file = "cryptography-44.0.0-pp310-pypy310_pp73-manylinux_2_28_aarch64.whl", hash = "sha256:f677e1268c4e23420c3acade68fac427fffcb8d19d7df95ed7ad17cdef8404f4"},
+    {file = "cryptography-44.0.0-pp310-pypy310_pp73-manylinux_2_28_x86_64.whl", hash = "sha256:f5e7cb1e5e56ca0933b4873c0220a78b773b24d40d186b6738080b73d3d0a756"},
+    {file = "cryptography-44.0.0-pp310-pypy310_pp73-manylinux_2_34_aarch64.whl", hash = "sha256:8b3e6eae66cf54701ee7d9c83c30ac0a1e3fa17be486033000f2a73a12ab507c"},
+    {file = "cryptography-44.0.0-pp310-pypy310_pp73-manylinux_2_34_x86_64.whl", hash = "sha256:be4ce505894d15d5c5037167ffb7f0ae90b7be6f2a98f9a5c3442395501c32fa"},
+    {file = "cryptography-44.0.0-pp310-pypy310_pp73-win_amd64.whl", hash = "sha256:62901fb618f74d7d81bf408c8719e9ec14d863086efe4185afd07c352aee1d2c"},
+    {file = "cryptography-44.0.0.tar.gz", hash = "sha256:cd4e834f340b4293430701e772ec543b0fbe6c2dea510a5286fe0acabe153a02"},
+]
+
+[package.dependencies]
+cffi = {version = ">=1.12", markers = "platform_python_implementation != \"PyPy\""}
+
+[package.extras]
+docs = ["sphinx (>=5.3.0)", "sphinx-rtd-theme (>=3.0.0)"]
+docstest = ["pyenchant (>=3)", "readme-renderer (>=30.0)", "sphinxcontrib-spelling (>=7.3.1)"]
+nox = ["nox (>=2024.4.15)", "nox[uv] (>=2024.3.2)"]
+pep8test = ["check-sdist", "click (>=8.0.1)", "mypy (>=1.4)", "ruff (>=0.3.6)"]
+sdist = ["build (>=1.0.0)"]
+ssh = ["bcrypt (>=3.1.5)"]
+test = ["certifi (>=2024)", "cryptography-vectors (==44.0.0)", "pretend (>=0.7)", "pytest (>=7.4.0)", "pytest-benchmark (>=4.0)", "pytest-cov (>=2.10.1)", "pytest-xdist (>=3.5.0)"]
+test-randomorder = ["pytest-randomly"]
+
 [[package]]
 name = "decorator"
 version = "5.1.1"
@@ -778,6 +908,17 @@ files = [
 [package.extras]
 tests = ["pytest"]
 
+[[package]]
+name = "pycparser"
+version = "2.22"
+description = "C parser in Python"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pycparser-2.22-py3-none-any.whl", hash = "sha256:c3702b6d3dd8c7abc1afa565d7e63d53a1d0bd86cdc24edd75470f4de499cfcc"},
+    {file = "pycparser-2.22.tar.gz", hash = "sha256:491c8be9c040f5390f5bf44a5b07752bd07f56edf992381b05c701439eec10f6"},
+]
+
 [[package]]
 name = "pydantic"
 version = "2.10.4"
@@ -1501,4 +1642,4 @@ hiredis = ["hiredis"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "9f0f96c653fdc92b7a1ed18be32ff88814ac5188b207fda1ea7e672a7cd19d6c"
+content-hash = "0da53315dee1155cfa3ec180a9120b32145497e290f13e17e481597179e2c993"

pssecret_server/fernet.py

@@ -0,0 +1,10 @@
+from typing import Annotated
+
+from cryptography.fernet import Fernet
+from fastapi import Depends
+
+from pssecret_server.settings import Settings, get_settings
+
+
+def get_fernet(settings: Annotated[Settings, Depends(get_settings)]) -> Fernet:
+    return Fernet(settings.secrets_encryption_key)

pssecret_server/main.py

@@ -1,16 +1,19 @@
 from typing import Annotated
 
+from cryptography.fernet import Fernet
 from fastapi import Depends, FastAPI
 from fastapi.exceptions import HTTPException
 from redis.asyncio import Redis
 
+from pssecret_server.fernet import get_fernet
 from pssecret_server.models import Secret, SecretSaveResult
 from pssecret_server.redis_db import get_redis
-from pssecret_server.utils import save_secret
+from pssecret_server.utils import decrypt_secret, encrypt_secret, save_secret
 
 app = FastAPI()
 
 RedisDep = Annotated[Redis, Depends(get_redis)]
+FernetDep = Annotated[Fernet, Depends(get_fernet)]
 
 
 @app.post(
@@ -23,7 +26,10 @@ RedisDep = Annotated[Redis, Depends(get_redis)]
     ),
     response_model=SecretSaveResult,
 )
-async def set_secret(data: Secret, redis: RedisDep) -> dict[str, str]:
+async def set_secret(
+    data: Secret, redis: RedisDep, fernet: FernetDep
+) -> dict[str, str]:
+    data = encrypt_secret(data, fernet)
     return {
         "key": await save_secret(data, redis),
     }
@@ -40,12 +46,14 @@ async def set_secret(data: Secret, redis: RedisDep) -> dict[str, str]:
     response_model=Secret,
     responses={404: {"description": "The item was not found"}},
 )
-async def get_secret(secret_key: str, redis: RedisDep) -> dict[str, bytes]:
+async def get_secret(
+    secret_key: str, redis: RedisDep, fernet: FernetDep
+) -> dict[str, bytes]:
     data: bytes | None = await redis.getdel(secret_key)
 
     if data is None:
         raise HTTPException(404)
 
     return {
-        "data": data,
+        "data": decrypt_secret(data, fernet),
     }

pssecret_server/settings.py

@@ -1,9 +1,12 @@
 from pydantic import RedisDsn
-from pydantic_settings import BaseSettings
+from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
 class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_file=".env")
+
     redis_url: RedisDsn = RedisDsn("redis://localhost")
+    secrets_encryption_key: bytes
 
 
 def get_settings() -> Settings:

pssecret_server/utils.py

@@ -1,10 +1,20 @@
 from uuid import uuid4
 
+from cryptography.fernet import Fernet
 from redis.asyncio import Redis
 
 from pssecret_server.models import Secret
 
 
+def encrypt_secret(data: Secret, fernet: Fernet) -> Secret:
+    encrypted = fernet.encrypt(data.data.encode()).decode()
+    return Secret(data=encrypted)
+
+
+def decrypt_secret(secret: bytes, fernet: Fernet) -> bytes:
+    return fernet.decrypt(secret)
+
+
 async def get_new_key(redis: Redis) -> str:
     """Returns free Redis key"""
     while True:

pyproject.toml

@@ -28,6 +28,7 @@ click = "8.1.8"
 fastapi = { version = "0.115.6", extras = [ "standard" ] }
 redis = "5.2.1"
 hiredis = { version = "3.1.0", optional = true }
+cryptography = "^44"
 
 [tool.poetry.extras]
 hiredis = ["hiredis"]

tests/conftest.py

@@ -1,10 +1,12 @@
 from collections.abc import AsyncGenerator
 
 import pytest
+from cryptography.fernet import Fernet
 from fastapi.testclient import TestClient
 from pydantic_settings import SettingsConfigDict
 from redis import asyncio as aioredis
 
+from pssecret_server.fernet import get_fernet
 from pssecret_server.main import app
 from pssecret_server.settings import Settings, get_settings
 
@@ -29,6 +31,11 @@ def get_test_settings() -> Settings:
     return TestSettings()
 
 
+@pytest.fixture
+def fernet(settings: Settings) -> Fernet:
+    return get_fernet(settings)
+
+
 @pytest.fixture(scope="session")
 def client() -> TestClient:
     client_ = TestClient(app)

tests/unit/test_utils.py

@@ -0,0 +1,31 @@
+import pytest
+from cryptography.fernet import Fernet, InvalidToken
+
+from pssecret_server.utils import decrypt_secret, encrypt_secret
+
+from ..factories import SecretFactory
+
+
+def test_encrypte_secret_ok(fernet: Fernet):
+    secret = SecretFactory().build()
+    encrypted_secret = encrypt_secret(secret, fernet)
+
+    assert secret.data != encrypted_secret.data
+
+
+def test_secret_is_decryptable_by_correct_key(fernet: Fernet):
+    secret = SecretFactory().build()
+    encrypted_secret = encrypt_secret(secret, fernet)
+    decrypted_secret = decrypt_secret(encrypted_secret.data.encode(), fernet)
+
+    assert decrypted_secret.decode() == secret.data
+
+
+def test_secret_is_not_decryptable_by_random_key(fernet: Fernet):
+    secret = SecretFactory().build()
+    encrypted_secret = encrypt_secret(secret, fernet)
+
+    random_fernet = Fernet(Fernet.generate_key())
+
+    with pytest.raises(InvalidToken):
+        decrypt_secret(encrypted_secret.data.encode(), random_fernet)