106 lines
3.0 KiB
Python
106 lines
3.0 KiB
Python
import os
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from io import BytesIO
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import gnupg
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from memory_profiler import memory_usage
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from pgpy import PGPMessage
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from app.config import GNUPGHOME
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from app.log import LOG
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from app.models import Mailbox, Contact
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from app.utils import random_string
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import pgpy
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gpg = gnupg.GPG(gnupghome=GNUPGHOME)
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gpg.encoding = "utf-8"
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class PGPException(Exception):
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pass
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class IncorrectPassphrasePGPException(Exception):
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pass
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def load_public_key(public_key: str) -> str:
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"""Load a public key into keyring and return the fingerprint. If error, raise Exception"""
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import_result = gpg.import_keys(public_key)
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try:
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return import_result.fingerprints[0]
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except Exception as e:
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raise PGPException("Cannot load key") from e
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def load_public_key_and_check(public_key: str) -> str:
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"""Same as load_public_key but will try an encryption using the new key.
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If the encryption fails, remove the newly created fingerprint.
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Return the fingerprint
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"""
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import_result = gpg.import_keys(public_key)
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try:
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fingerprint = import_result.fingerprints[0]
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except Exception as e:
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raise PGPException("Cannot load key") from e
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else:
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dummy_data = BytesIO(b"test")
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r = gpg.encrypt_file(dummy_data, fingerprint)
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if not r.ok:
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# remove the fingerprint
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gpg.delete_keys([fingerprint])
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if r.GPG_ERROR_CODES == {11: "incorrect passphrase"}:
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LOG.warning("Incorrect passphrase")
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raise IncorrectPassphrasePGPException()
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raise PGPException("Encryption fails with the key")
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return fingerprint
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def hard_exit():
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pid = os.getpid()
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LOG.warning("kill pid %s", pid)
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os.kill(pid, 9)
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def encrypt_file(data: BytesIO, fingerprint: str) -> str:
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LOG.d("encrypt for %s", fingerprint)
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mem_usage = memory_usage(-1, interval=1, timeout=1)[0]
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LOG.d("mem_usage %s", mem_usage)
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r = gpg.encrypt_file(data, fingerprint, always_trust=True)
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if not r.ok:
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# maybe the fingerprint is not loaded on this host, try to load it
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found = False
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# searching for the key in mailbox
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mailbox = Mailbox.get_by(pgp_finger_print=fingerprint)
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if mailbox:
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LOG.d("(re-)load public key for %s", mailbox)
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load_public_key(mailbox.pgp_public_key)
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found = True
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# searching for the key in contact
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contact = Contact.get_by(pgp_finger_print=fingerprint)
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if contact:
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LOG.d("(re-)load public key for %s", contact)
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load_public_key(contact.pgp_public_key)
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found = True
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if found:
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LOG.d("retry to encrypt")
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data.seek(0)
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r = gpg.encrypt_file(data, fingerprint, always_trust=True)
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if not r.ok:
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raise PGPException(f"Cannot encrypt, status: {r.status}")
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return str(r)
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def encrypt_file_with_pgpy(data: bytes, public_key: str) -> PGPMessage:
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key = pgpy.PGPKey()
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key.parse(public_key)
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msg = pgpy.PGPMessage.new(data, encoding="utf-8")
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r = key.encrypt(msg)
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return r
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