235 lines
8.1 KiB
Python
235 lines
8.1 KiB
Python
import io
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import json
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import os
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import shutil
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import subprocess
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from collections.abc import Iterator
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from contextlib import contextmanager
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from pathlib import Path
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from tempfile import NamedTemporaryFile
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from typing import IO
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from ..cmd import Log, run
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from ..dirs import user_config_dir
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from ..errors import ClanError
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from ..nix import nix_shell
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from .folders import sops_machines_folder, sops_users_folder
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class SopsKey:
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def __init__(self, pubkey: str, username: str) -> None:
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self.pubkey = pubkey
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self.username = username
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def get_public_key(privkey: str) -> str:
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cmd = nix_shell(["nixpkgs#age"], ["age-keygen", "-y"])
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try:
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res = subprocess.run(
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cmd, input=privkey, stdout=subprocess.PIPE, text=True, check=True
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)
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except subprocess.CalledProcessError as e:
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raise ClanError(
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"Failed to get public key for age private key. Is the key malformed?"
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) from e
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return res.stdout.strip()
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def generate_private_key(out_file: Path | None = None) -> tuple[str, str]:
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cmd = nix_shell(["nixpkgs#age"], ["age-keygen"])
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try:
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proc = run(cmd)
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res = proc.stdout.strip()
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pubkey = None
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private_key = None
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for line in res.splitlines():
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if line.startswith("# public key:"):
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pubkey = line.split(":")[1].strip()
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if not line.startswith("#"):
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private_key = line
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if not pubkey:
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raise ClanError("Could not find public key in age-keygen output")
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if not private_key:
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raise ClanError("Could not find private key in age-keygen output")
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if out_file:
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out_file.parent.mkdir(parents=True, exist_ok=True)
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out_file.write_text(res)
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return private_key, pubkey
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except subprocess.CalledProcessError as e:
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raise ClanError("Failed to generate private sops key") from e
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def get_user_name(flake_dir: Path, user: str) -> str:
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"""Ask the user for their name until a unique one is provided."""
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while True:
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name = input(
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f"Your key is not yet added to the repository. Enter your user name for which your sops key will be stored in the repository [default: {user}]: "
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)
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if name:
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user = name
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if not (flake_dir / user).exists():
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return user
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print(f"{flake_dir / user} already exists")
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def ensure_user_or_machine(flake_dir: Path, pub_key: str) -> SopsKey:
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key = SopsKey(pub_key, username="")
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folders = [sops_users_folder(flake_dir), sops_machines_folder(flake_dir)]
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for folder in folders:
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if folder.exists():
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for user in folder.iterdir():
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if not (user / "key.json").exists():
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continue
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if read_key(user) == pub_key:
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key.username = user.name
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return key
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raise ClanError(
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f"Your sops key is not yet added to the repository. Please add it with 'clan secrets users add youruser {pub_key}' (replace youruser with your user name)"
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)
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def default_sops_key_path() -> Path:
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raw_path = os.environ.get("SOPS_AGE_KEY_FILE")
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if raw_path:
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return Path(raw_path)
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else:
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return user_config_dir() / "sops" / "age" / "keys.txt"
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def ensure_sops_key(flake_dir: Path) -> SopsKey:
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key = os.environ.get("SOPS_AGE_KEY")
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if key:
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return ensure_user_or_machine(flake_dir, get_public_key(key))
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path = default_sops_key_path()
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if path.exists():
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return ensure_user_or_machine(flake_dir, get_public_key(path.read_text()))
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else:
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raise ClanError(
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"No sops key found. Please generate one with 'clan secrets key generate'."
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)
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@contextmanager
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def sops_manifest(keys: list[str]) -> Iterator[Path]:
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with NamedTemporaryFile(delete=False, mode="w") as manifest:
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json.dump(
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dict(creation_rules=[dict(key_groups=[dict(age=keys)])]), manifest, indent=2
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)
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manifest.flush()
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yield Path(manifest.name)
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def update_keys(secret_path: Path, keys: list[str]) -> list[Path]:
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with sops_manifest(keys) as manifest:
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secret_path = secret_path / "secret"
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time_before = secret_path.stat().st_mtime
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cmd = nix_shell(
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["nixpkgs#sops"],
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[
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"sops",
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"--config",
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str(manifest),
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"updatekeys",
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"--yes",
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str(secret_path),
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],
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)
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run(cmd, log=Log.BOTH, error_msg=f"Could not update keys for {secret_path}")
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if time_before == secret_path.stat().st_mtime:
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return []
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return [secret_path]
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def encrypt_file(
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secret_path: Path, content: IO[str] | str | bytes | None, keys: list[str]
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) -> None:
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folder = secret_path.parent
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folder.mkdir(parents=True, exist_ok=True)
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with sops_manifest(keys) as manifest:
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if not content:
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args = ["sops", "--config", str(manifest)]
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args.extend([str(secret_path)])
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cmd = nix_shell(["nixpkgs#sops"], args)
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# Don't use our `run` here, because it breaks editor integration.
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# We never need this in our UI.
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p = subprocess.run(cmd, check=False)
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# returns 200 if the file is changed
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if p.returncode != 0 and p.returncode != 200:
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raise ClanError(
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f"Failed to encrypt {secret_path}: sops exited with {p.returncode}"
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)
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return
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# hopefully /tmp is written to an in-memory file to avoid leaking secrets
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with NamedTemporaryFile(delete=False) as f:
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try:
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if isinstance(content, str):
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with open(f.name, "w") as fd:
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fd.write(content)
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elif isinstance(content, bytes):
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with open(f.name, "wb") as fd:
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fd.write(content)
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elif isinstance(content, io.IOBase):
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with open(f.name, "w") as fd:
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shutil.copyfileobj(content, fd)
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else:
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raise ClanError(f"Invalid content type: {type(content)}")
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# we pass an empty manifest to pick up existing configuration of the user
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args = ["sops", "--config", str(manifest)]
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args.extend(["-i", "--encrypt", str(f.name)])
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cmd = nix_shell(["nixpkgs#sops"], args)
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run(cmd, log=Log.BOTH)
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# atomic copy of the encrypted file
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with NamedTemporaryFile(dir=folder, delete=False) as f2:
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shutil.copyfile(f.name, f2.name)
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os.rename(f2.name, secret_path)
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finally:
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try:
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os.remove(f.name)
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except OSError:
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pass
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def decrypt_file(secret_path: Path) -> str:
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with sops_manifest([]) as manifest:
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cmd = nix_shell(
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["nixpkgs#sops"],
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["sops", "--config", str(manifest), "--decrypt", str(secret_path)],
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)
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res = run(cmd, error_msg=f"Could not decrypt {secret_path}")
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return res.stdout
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def write_key(path: Path, publickey: str, overwrite: bool) -> None:
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path.mkdir(parents=True, exist_ok=True)
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try:
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flags = os.O_CREAT | os.O_WRONLY | os.O_TRUNC
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if not overwrite:
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flags |= os.O_EXCL
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fd = os.open(path / "key.json", flags)
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except FileExistsError:
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raise ClanError(
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f"{path.name} already exists in {path}. Use --force to overwrite."
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)
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with os.fdopen(fd, "w") as f:
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json.dump({"publickey": publickey, "type": "age"}, f, indent=2)
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def read_key(path: Path) -> str:
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with open(path / "key.json") as f:
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try:
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key = json.load(f)
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except json.JSONDecodeError as e:
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raise ClanError(f"Failed to decode {path.name}: {e}")
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if key["type"] != "age":
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raise ClanError(
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f"{path.name} is not an age key but {key['type']}. This is not supported"
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)
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publickey = key.get("publickey")
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if not publickey:
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raise ClanError(f"{path.name} does not contain a public key")
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return publickey
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