selfprivacy-rest-api/selfprivacy_api/utils/__init__.py

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#!/usr/bin/env python3
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"""Various utility functions"""
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import datetime
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from enum import Enum
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import json
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import os
import subprocess
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import portalocker
import typing
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USERDATA_FILE = "/etc/nixos/userdata.json"
SECRETS_FILE = "/etc/selfprivacy/secrets.json"
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DKIM_DIR = "/var/dkim/"
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class UserDataFiles(Enum):
"""Enum for userdata files"""
USERDATA = 0
SECRETS = 3
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def get_domain():
"""Get domain from userdata.json"""
with ReadUserData() as user_data:
return user_data["domain"]
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class WriteUserData(object):
"""Write userdata.json with lock"""
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def __init__(self, file_type=UserDataFiles.USERDATA):
if file_type == UserDataFiles.USERDATA:
self.userdata_file = open(USERDATA_FILE, "r+", encoding="utf-8")
elif file_type == UserDataFiles.SECRETS:
# Make sure file exists
if not os.path.exists(SECRETS_FILE):
with open(SECRETS_FILE, "w", encoding="utf-8") as secrets_file:
secrets_file.write("{}")
self.userdata_file = open(SECRETS_FILE, "r+", encoding="utf-8")
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else:
raise ValueError("Unknown file type")
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portalocker.lock(self.userdata_file, portalocker.LOCK_EX)
self.data = json.load(self.userdata_file)
def __enter__(self):
return self.data
def __exit__(self, exc_type, exc_value, traceback):
if exc_type is None:
self.userdata_file.seek(0)
json.dump(self.data, self.userdata_file, indent=4)
self.userdata_file.truncate()
portalocker.unlock(self.userdata_file)
self.userdata_file.close()
class ReadUserData(object):
"""Read userdata.json with lock"""
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def __init__(self, file_type=UserDataFiles.USERDATA):
if file_type == UserDataFiles.USERDATA:
self.userdata_file = open(USERDATA_FILE, "r", encoding="utf-8")
elif file_type == UserDataFiles.SECRETS:
if not os.path.exists(SECRETS_FILE):
with open(SECRETS_FILE, "w", encoding="utf-8") as secrets_file:
secrets_file.write("{}")
self.userdata_file = open(SECRETS_FILE, "r", encoding="utf-8")
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else:
raise ValueError("Unknown file type")
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portalocker.lock(self.userdata_file, portalocker.LOCK_SH)
self.data = json.load(self.userdata_file)
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def __enter__(self) -> dict:
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return self.data
def __exit__(self, *args):
portalocker.unlock(self.userdata_file)
self.userdata_file.close()
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def validate_ssh_public_key(key):
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"""Validate SSH public key.
It may be ssh-ed25519, ssh-rsa or ecdsa-sha2-nistp256."""
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if not key.startswith("ssh-ed25519"):
if not key.startswith("ssh-rsa"):
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if not key.startswith("ecdsa-sha2-nistp256"):
return False
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return True
def is_username_forbidden(username):
forbidden_prefixes = ["systemd", "nixbld"]
forbidden_usernames = [
"root",
"messagebus",
"postfix",
"polkituser",
"dovecot2",
"dovenull",
"nginx",
"postgres",
"prosody",
"opendkim",
"rspamd",
"sshd",
"selfprivacy-api",
"restic",
"redis",
"pleroma",
"ocserv",
"nextcloud",
"memcached",
"knot-resolver",
"gitea",
"bitwarden_rs",
"vaultwarden",
"acme",
"virtualMail",
"nobody",
]
for prefix in forbidden_prefixes:
if username.startswith(prefix):
return True
for forbidden_username in forbidden_usernames:
if username == forbidden_username:
return True
return False
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def parse_date(date_str: str) -> datetime.datetime:
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"""Parse date string which can be in one of these formats:
- %Y-%m-%dT%H:%M:%S.%fZ
- %Y-%m-%dT%H:%M:%S.%f
- %Y-%m-%d %H:%M:%S.%fZ
- %Y-%m-%d %H:%M:%S.%f
"""
try:
return datetime.datetime.strptime(date_str, "%Y-%m-%d %H:%M:%S.%fZ")
except ValueError:
pass
try:
return datetime.datetime.strptime(date_str, "%Y-%m-%d %H:%M:%S.%f")
except ValueError:
pass
try:
return datetime.datetime.strptime(date_str, "%Y-%m-%dT%H:%M:%S.%fZ")
except ValueError:
pass
try:
return datetime.datetime.strptime(date_str, "%Y-%m-%dT%H:%M:%S.%f")
except ValueError:
pass
raise ValueError("Invalid date string")
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def parse_dkim(dkim: str) -> str:
# extract key from file
dkim = dkim.split("(")[1]
dkim = dkim.split(")")[0]
# replace all quotes with nothing
dkim = dkim.replace('"', "")
# trim whitespace, remove newlines and tabs
dkim = dkim.strip()
dkim = dkim.replace("\n", "")
dkim = dkim.replace("\t", "")
# remove all redundant spaces
dkim = " ".join(dkim.split())
return dkim
def get_dkim_key(domain: str, parse: bool = True) -> typing.Optional[str]:
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"""Get DKIM key from /var/dkim/<domain>.selector.txt"""
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dkim_path = os.path.join(DKIM_DIR, domain + ".selector.txt")
if os.path.exists(dkim_path):
with open(dkim_path, encoding="utf-8") as dkim_file:
dkim = dkim_file.read()
if parse:
dkim = parse_dkim(dkim)
return dkim
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return None
def hash_password(password):
hashing_command = ["mkpasswd", "-m", "sha-512", password]
password_hash_process_descriptor = subprocess.Popen(
hashing_command,
shell=False,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
)
hashed_password = password_hash_process_descriptor.communicate()[0]
hashed_password = hashed_password.decode("ascii")
hashed_password = hashed_password.rstrip()
return hashed_password