keyring/libkeyringctl/keyring.py

1263 lines
47 KiB
Python
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2023-03-25 22:26:34 +01:00
# SPDX-License-Identifier: GPL-3.0-or-later
from collections import defaultdict
from itertools import chain
from logging import debug
from logging import error
from pathlib import Path
from platform import python_version_tuple
from re import match
from shutil import copytree
from tempfile import NamedTemporaryFile
from tempfile import mkdtemp
from typing import Dict
# NOTE: remove after python 3.8.x is no longer supported upstream
if int(python_version_tuple()[1]) < 9: # pragma: no cover
from typing import Iterable
else:
from collections.abc import Iterable
from typing import List
from typing import Optional
from typing import Set
from .sequoia import inspect
from .sequoia import keyring_merge
from .sequoia import keyring_split
from .sequoia import latest_certification
from .sequoia import packet_dump_field
from .sequoia import packet_join
from .sequoia import packet_signature_creation_time
from .sequoia import packet_split
from .trust import certificate_trust
from .trust import certificate_trust_from_paths
from .trust import filter_by_trust
from .trust import format_trust_label
from .trust import trust_color
from .types import Color
from .types import Fingerprint
from .types import Trust
from .types import TrustFilter
from .types import Uid
from .types import Username
from .util import contains_fingerprint
from .util import filter_fingerprints_by_trust
from .util import get_cert_paths
from .util import get_fingerprint_from_partial
from .util import simplify_uid
from .util import transform_fd_to_tmpfile
PACKET_FILENAME_DATETIME_FORMAT: str = "%Y-%m-%d_%H-%M-%S"
def is_pgp_fingerprint(string: str) -> bool:
"""Returns whether the passed string looks like a PGP (long) fingerprint
Parameters
----------
string: Input to consider as a fingerprint
Returns
-------
RWhether string is a fingerprint
"""
if len(string) not in [16, 40]:
return False
return match("^[A-F0-9]+$", string) is not None
def transform_username_to_keyring_path(keyring_dir: Path, paths: List[Path]) -> None:
"""Mutates the input sources by transforming passed usernames to keyring paths
Parameters
----------
keyring_dir: The directory underneath the username needs to exist
paths: A list of paths to mutate and replace usernames to keyring paths
"""
for index, source in enumerate(paths):
if source.exists():
continue
packager_source = keyring_dir / source.name
if not packager_source.exists():
continue
paths[index] = packager_source
def transform_fingerprint_to_keyring_path(keyring_root: Path, paths: List[Path]) -> None:
"""Mutates the input sources by transforming passed fingerprints to keyring paths
Parameters
----------
keyring_root: The keyring root directory to look up fingerprints in
paths: A list of paths to mutate and replace fingerprints to keyring paths
"""
for index, source in enumerate(paths):
if source.exists():
continue
if not is_pgp_fingerprint(source.name):
continue
fingerprint_paths = list(keyring_root.glob(f"*/*/*{source.name}"))
if not fingerprint_paths:
continue
paths[index] = fingerprint_paths[0]
def convert_pubkey_signature_packet(
packet: Path,
certificate_fingerprint: Fingerprint,
fingerprint_filter: Optional[Set[Fingerprint]],
current_packet_fingerprint: Optional[Fingerprint],
key_revocations: Dict[Fingerprint, Path],
direct_revocations: Dict[Fingerprint, List[Path]],
direct_sigs: Dict[Fingerprint, List[Path]],
) -> None:
"""Convert a public key signature packet
packet: The Path of the packet file to process
certificate_fingerprint: The public key certificate fingerprint
fingerprint_filter: Optional list of fingerprints of PGP public keys that all certifications will be filtered with
current_packet_fingerprint: Optional certificate fingerprint of the current packet
key_revocation: A dictionary of key revocation packets
direct_revocations: A dictionary of direct key revocations
direct_sigs: A dictionary of direct key signatures
"""
if not current_packet_fingerprint:
raise Exception('missing current packet fingerprint for "{packet.name}"')
signature_type = packet_dump_field(packet=packet, query="Type")
issuer = get_fingerprint_from_partial(
fingerprint_filter or set(), Fingerprint(packet_dump_field(packet, "Hashed area|Unhashed area.Issuer"))
)
if not issuer:
debug(f"failed to resolve partial fingerprint {issuer}, skipping packet")
return
if not certificate_fingerprint.endswith(issuer):
debug(f"skipping direct key signature because {issuer} is a third-party and not a self signature")
return
if signature_type == "KeyRevocation":
key_revocations[issuer] = packet
elif signature_type == "DirectKey" or signature_type.endswith("Certification"):
direct_sigs[issuer].append(packet)
elif signature_type == "CertificationRevocation":
direct_revocations[issuer].append(packet)
else:
raise Exception(f"unknown signature type: {signature_type}")
def convert_uid_signature_packet(
packet: Path,
current_packet_uid: Optional[Uid],
fingerprint_filter: Optional[Set[Fingerprint]],
certifications: Dict[Uid, Dict[Fingerprint, List[Path]]],
revocations: Dict[Uid, Dict[Fingerprint, List[Path]]],
) -> None:
"""Convert a UID signature packet
packet: The Path of the packet file to process
current_packet_uid: Optional Uid of the current packet
fingerprint_filter: Optional list of fingerprints of PGP public keys that all certifications will be filtered with
certifications: A dictionary containing all certificaions
revocations: A dictionary containing all revocations
"""
if not current_packet_uid:
raise Exception('missing current packet uid for "{packet.name}"')
signature_type = packet_dump_field(packet=packet, query="Type")
issuer = get_fingerprint_from_partial(
fingerprint_filter or set(), Fingerprint(packet_dump_field(packet, "Hashed area|Unhashed area.Issuer"))
)
if not issuer:
debug(f"failed to resolve partial fingerprint {issuer}, skipping packet")
else:
if signature_type == "CertificationRevocation":
if fingerprint_filter is None or contains_fingerprint(fingerprints=fingerprint_filter, fingerprint=issuer):
revocations[current_packet_uid][issuer].append(packet)
else:
debug(f"The revocation by issuer {issuer} is not appended because it is not in the filter")
elif signature_type.endswith("Certification"):
if fingerprint_filter is None or contains_fingerprint(fingerprints=fingerprint_filter, fingerprint=issuer):
debug(f"The certification by issuer {issuer} is appended as it is found in the filter.")
certifications[current_packet_uid][issuer].append(packet)
else:
debug(f"The certification by issuer {issuer} is not appended because it is not in the filter")
else:
raise Exception(f"unknown signature type: {signature_type}")
def convert_subkey_signature_packet(
packet: Path,
certificate_fingerprint: Fingerprint,
current_packet_fingerprint: Optional[Fingerprint],
fingerprint_filter: Optional[Set[Fingerprint]],
subkey_bindings: Dict[Fingerprint, List[Path]],
subkey_revocations: Dict[Fingerprint, List[Path]],
) -> None:
"""Convert a subkey signature packet
packet: The Path of the packet file to process
certificate_fingerprint: The public key certificate fingerprint
current_packet_fingerprint: Optional certificate fingerprint of the current packet
fingerprint_filter: Optional list of fingerprints of PGP public keys that all certifications will be filtered with
subkey_bindings: A dictionary containing all subkey binding signatures
subkey_revocations: A dictionary containing all subkey revocations
"""
if not current_packet_fingerprint:
raise Exception('missing current packet fingerprint for "{packet.name}"')
signature_type = packet_dump_field(packet=packet, query="Type")
issuer = get_fingerprint_from_partial(
fingerprint_filter or set(), Fingerprint(packet_dump_field(packet, "Hashed area|Unhashed area.Issuer"))
)
if not issuer:
debug(f"failed to resolve partial fingerprint {issuer}, skipping packet")
else:
if issuer != certificate_fingerprint:
raise Exception(f"subkey packet does not belong to {certificate_fingerprint}, issuer: {issuer}")
if signature_type == "SubkeyBinding":
subkey_bindings[current_packet_fingerprint].append(packet)
elif signature_type == "SubkeyRevocation":
subkey_revocations[current_packet_fingerprint].append(packet)
else:
raise Exception(f"unknown signature type: {signature_type}")
def convert_signature_packet(
packet: Path,
current_packet_mode: Optional[str],
certificate_fingerprint: Optional[Fingerprint],
fingerprint_filter: Optional[Set[Fingerprint]],
key_revocations: Dict[Fingerprint, Path],
current_packet_fingerprint: Optional[Fingerprint],
current_packet_uid: Optional[Uid],
direct_revocations: Dict[Fingerprint, List[Path]],
direct_sigs: Dict[Fingerprint, List[Path]],
certifications: Dict[Uid, Dict[Fingerprint, List[Path]]],
revocations: Dict[Uid, Dict[Fingerprint, List[Path]]],
subkey_bindings: Dict[Fingerprint, List[Path]],
subkey_revocations: Dict[Fingerprint, List[Path]],
) -> None:
"""Convert a signature packet
packet: The Path of the packet file to process
certificate_fingerprint: The public key certificate fingerprint
fingerprint_filter: Optional list of fingerprints of PGP public keys that all certifications will be filtered with
key_revocation: A dictionary containing all key revocation packet
current_packet_fingerprint: Optional certificate fingerprint of the current packet
current_packet_uid: Optional Uid of the current packet
direct_revocations: A dictionary of direct key revocations
direct_sigs: A dictionary of direct key signatures
certifications: A dictionary containing all certificaions
revocations: A dictionary containing all revocations
subkey_bindings: A dictionary containing all subkey binding signatures
subkey_revocations: A dictionary containing all subkey revocations
"""
if not certificate_fingerprint:
raise Exception('missing certificate fingerprint for "{packet.name}"')
if current_packet_mode == "pubkey":
convert_pubkey_signature_packet(
packet=packet,
certificate_fingerprint=certificate_fingerprint,
fingerprint_filter=fingerprint_filter,
current_packet_fingerprint=current_packet_fingerprint,
key_revocations=key_revocations,
direct_revocations=direct_revocations,
direct_sigs=direct_sigs,
)
elif current_packet_mode == "uid":
convert_uid_signature_packet(
packet=packet,
current_packet_uid=current_packet_uid,
fingerprint_filter=fingerprint_filter,
certifications=certifications,
revocations=revocations,
)
elif current_packet_mode == "subkey":
convert_subkey_signature_packet(
packet=packet,
current_packet_fingerprint=current_packet_fingerprint,
certificate_fingerprint=certificate_fingerprint,
fingerprint_filter=fingerprint_filter,
subkey_bindings=subkey_bindings,
subkey_revocations=subkey_revocations,
)
elif current_packet_mode == "uattr":
# ignore user attributes and related signatures
debug("skipping user attribute signature packet")
else:
raise Exception(f'unknown signature root for "{packet.name}"')
def clean_keyring(keyring: Path) -> None:
"""Clean the keyring by f.e. removing old obsolete certifications with matching revocations.
Parameters
----------
keyring: Root directory of the keyring containing all keys to clean.
"""
for cert in get_cert_paths(paths=[keyring]):
for uid in (cert / "uid").iterdir():
certifications = uid / "certification"
revocations = uid / "revocation"
if not certifications.exists() or not revocations.exists():
continue
for revocation in revocations.iterdir():
certification = certifications / revocation.name
if certification.exists():
debug(f"Cleaning up old certification {certification} for revocation {revocation}")
certification.unlink()
def convert_certificate(
working_dir: Path,
certificate: Path,
keyring_dir: Path,
name_override: Optional[Username] = None,
fingerprint_filter: Optional[Set[Fingerprint]] = None,
) -> Path:
"""Convert a single file public key certificate into a decomposed directory structure of multiple PGP packets
The output directory structure is created per user. The username is derived from the certificate via
`derive_username_from_fingerprint` or overridden via `name_override`.
Below the username directory a directory tree describes the public keys components split up into certifications
and revocations, as well as per subkey and per uid certifications and revocations.
Parameters
----------
working_dir: The path of the working directory below which to create split certificates
certificate: The path to a public key certificate
keyring_dir: The path of the keyring used to try to derive the username from the public key fingerprint
name_override: An optional string to override the username in the to be created output directory structure
fingerprint_filter: Optional list of fingerprints of PGP public keys that all certifications will be filtered with
Raises
------
Exception: If required PGP packets are not found
Returns
-------
The path of the key directory (which is located below working_dir below the user_dir)
"""
# root packets
certificate_fingerprint: Optional[Fingerprint] = None
pubkey: Optional[Path] = None
key_revocations: Dict[Fingerprint, Path] = {}
direct_sigs: Dict[Fingerprint, List[Path]] = defaultdict(list)
direct_revocations: Dict[Fingerprint, List[Path]] = defaultdict(list)
# subkey packets
subkeys: Dict[Fingerprint, Path] = {}
subkey_bindings: Dict[Fingerprint, List[Path]] = defaultdict(list)
subkey_revocations: Dict[Fingerprint, List[Path]] = defaultdict(list)
# uid packets
uids: Dict[Uid, Path] = {}
certifications: Dict[Uid, Dict[Fingerprint, List[Path]]] = defaultdict(lambda: defaultdict(list))
revocations: Dict[Uid, Dict[Fingerprint, List[Path]]] = defaultdict(lambda: defaultdict(list))
# intermediate variables
current_packet_mode: Optional[str] = None
current_packet_fingerprint: Optional[Fingerprint] = None
current_packet_uid: Optional[Uid] = None
debug(f"Processing certificate {certificate}")
for packet in packet_split(working_dir=working_dir, certificate=certificate):
debug(f"Processing packet {packet.name}")
if packet.name.endswith("--PublicKey"):
current_packet_mode = "pubkey"
current_packet_fingerprint = Fingerprint(packet_dump_field(packet, "Fingerprint"))
current_packet_uid = None
certificate_fingerprint = current_packet_fingerprint
pubkey = packet
elif packet.name.endswith("--UserID"):
current_packet_mode = "uid"
current_packet_fingerprint = None
current_packet_uid = Uid(packet_dump_field(packet, "Value"))
if current_packet_uid in uids:
raise Exception(
f"Duplicate User ID {current_packet_uid} used in packet {uids[current_packet_uid]} and {packet}"
)
uids[current_packet_uid] = packet
elif packet.name.endswith("UserAttribute"):
current_packet_mode = "uattr"
current_packet_fingerprint = None
current_packet_uid = None
elif packet.name.endswith("--PublicSubkey"):
current_packet_mode = "subkey"
current_packet_fingerprint = Fingerprint(packet_dump_field(packet, "Fingerprint"))
current_packet_uid = None
subkeys[current_packet_fingerprint] = packet
elif packet.name.endswith("--SecretKey"):
error(
"\n###################################################################\n"
"Do not ever process your private key file!\n"
"Consider using a hardware token instead of local private key files!\n"
"###################################################################"
)
raise Exception("Secret key detected, aborting")
elif packet.name.endswith("--Signature"):
convert_signature_packet(
packet=packet,
current_packet_mode=current_packet_mode,
certificate_fingerprint=certificate_fingerprint,
fingerprint_filter=fingerprint_filter,
current_packet_fingerprint=current_packet_fingerprint,
current_packet_uid=current_packet_uid,
key_revocations=key_revocations,
direct_revocations=direct_revocations,
direct_sigs=direct_sigs,
certifications=certifications,
revocations=revocations,
subkey_bindings=subkey_bindings,
subkey_revocations=subkey_revocations,
)
else:
raise Exception(f'unknown packet type "{packet.name}"')
if not certificate_fingerprint or not pubkey:
raise Exception("missing certificate public key")
name_override = (
name_override
or derive_username_from_fingerprint(keyring_dir=keyring_dir, certificate_fingerprint=certificate_fingerprint)
or Username(certificate.stem)
)
user_dir = working_dir / name_override
key_dir = user_dir / certificate_fingerprint
key_dir.mkdir(parents=True, exist_ok=True)
persist_key_material(
key_dir=key_dir,
direct_sigs=direct_sigs,
direct_revocations=direct_revocations,
certificate_fingerprint=certificate_fingerprint,
pubkey=pubkey,
key_revocations=key_revocations,
subkeys=subkeys,
subkey_bindings=subkey_bindings,
subkey_revocations=subkey_revocations,
uids=uids,
certifications=certifications,
revocations=revocations,
)
return key_dir
def persist_key_material(
key_dir: Path,
direct_sigs: Dict[Fingerprint, List[Path]],
direct_revocations: Dict[Fingerprint, List[Path]],
certificate_fingerprint: Fingerprint,
pubkey: Path,
key_revocations: Dict[Fingerprint, Path],
subkeys: Dict[Fingerprint, Path],
subkey_bindings: Dict[Fingerprint, List[Path]],
subkey_revocations: Dict[Fingerprint, List[Path]],
uids: Dict[Uid, Path],
certifications: Dict[Uid, Dict[Fingerprint, List[Path]]],
revocations: Dict[Uid, Dict[Fingerprint, List[Path]]],
) -> None:
"""Persist the key material found in a certificate to decomposed directory structure
key_dir: The Path below which to create a decomposed directory structure for the certificate
direct_sigs: A dictionary of direct key signatures
direct_revocations: A dictionary of direct key revocations
certificate_fingerprint: The public key certificate fingerprint
pubkey: The Path of the PGP packet representing the public key material
key_revocations: A dictionary containing all key revocations
subkeys: A dictionary of Paths per Fingerprint that represent the subkey material of the certificate
subkey_bindings: A dictionary containing all subkey binding signatures
subkey_revocations: A dictionary containing all subkey revocations
uids: A dictionary of Path per Uid, that represent the UID packets of the certificate
certifications: A dictionary containing all certificaions
revocations: A dictionary containing all revocations
"""
persist_public_key(
certificate_fingerprint=certificate_fingerprint,
pubkey=pubkey,
key_dir=key_dir,
)
persist_key_revocations(
key_dir=key_dir,
key_revocations=key_revocations,
)
persist_direct_key_certifications(
direct_key_certifications=direct_sigs,
key_dir=key_dir,
)
persist_direct_key_revocations(
direct_key_revocations=direct_revocations,
key_dir=key_dir,
)
persist_subkeys(
key_dir=key_dir,
subkeys=subkeys,
)
persist_subkey_bindings(
key_dir=key_dir,
subkey_bindings=subkey_bindings,
issuer=certificate_fingerprint,
)
persist_subkey_revocations(
key_dir=key_dir,
subkey_revocations=subkey_revocations,
issuer=certificate_fingerprint,
)
persist_uids(
key_dir=key_dir,
uids=uids,
)
persist_uid_certifications(
certifications=certifications,
revocations=revocations,
key_dir=key_dir,
)
persist_uid_revocations(
revocations=revocations,
key_dir=key_dir,
)
def persist_public_key(
certificate_fingerprint: Fingerprint,
pubkey: Path,
key_dir: Path,
) -> None:
"""Persist the Public-Key packet
Parameters
----------
certificate_fingerprint: The unique fingerprint of the public key
pubkey: The path to the public key of the root key
key_dir: The root directory below which the basic key material is persisted
"""
packets: List[Path] = [pubkey]
output_file = key_dir / f"{certificate_fingerprint}.asc"
output_file.parent.mkdir(parents=True, exist_ok=True)
debug(f"Writing file {output_file} from {[str(packet) for packet in packets]}")
packet_join(packets, output_file, force=True)
def persist_uids(
key_dir: Path,
uids: Dict[Uid, Path],
) -> None:
"""Persist the User IDs that belong to a PublicKey
The User ID material consists of a single User ID Packet.
The files are written to a UID specific directory and file below key_dir/uid.
Parameters
----------
key_dir: The root directory below which the basic key material is persisted
uids: The User IDs of a Public-Key (the root key)
"""
for uid, uid_packet in uids.items():
simplified_uid = simplify_uid(uid)
output_file = key_dir / "uid" / simplified_uid / f"{simplified_uid}.asc"
output_file.parent.mkdir(parents=True, exist_ok=True)
debug(f"Writing file {output_file} from {uid_packet}")
packet_join(packets=[uid_packet], output=output_file, force=True)
def persist_subkeys(
key_dir: Path,
subkeys: Dict[Fingerprint, Path],
) -> None:
"""Persist all Public-Subkeys of a root key file to file(s)
Parameters
----------
key_dir: The root directory below which the basic key material is persisted
subkeys: The PublicSubkeys of a key
"""
for fingerprint, subkey in subkeys.items():
output_file = key_dir / "subkey" / fingerprint / f"{fingerprint}.asc"
output_file.parent.mkdir(parents=True, exist_ok=True)
debug(f"Writing file {output_file} from {str(subkey)}")
packet_join(packets=[subkey], output=output_file, force=True)
def persist_subkey_bindings(
key_dir: Path,
subkey_bindings: Dict[Fingerprint, List[Path]],
issuer: Fingerprint,
) -> None:
"""Persist all SubkeyBinding of a root key file to file(s)
Parameters
----------
key_dir: The root directory below which the basic key material is persisted
subkey_bindings: The SubkeyBinding signatures of a Public-Subkey
issuer: Fingerprint of the issuer
"""
for fingerprint, bindings in subkey_bindings.items():
subkey_binding = latest_certification(bindings)
output_file = key_dir / "subkey" / fingerprint / "certification" / f"{issuer}.asc"
output_file.parent.mkdir(parents=True, exist_ok=True)
debug(f"Writing file {output_file} from {str(subkey_binding)}")
packet_join(packets=[subkey_binding], output=output_file, force=True)
def persist_subkey_revocations(
key_dir: Path,
subkey_revocations: Dict[Fingerprint, List[Path]],
issuer: Fingerprint,
) -> None:
"""Persist the SubkeyRevocations of all Public-Subkeys of a root key to file(s)
Parameters
----------
key_dir: The root directory below which the basic key material is persisted
subkey_revocations: The SubkeyRevocations of PublicSubkeys of a key
issuer: Fingerprint of the issuer
"""
for fingerprint, revocations in subkey_revocations.items():
revocation = latest_certification(revocations)
output_file = key_dir / "subkey" / fingerprint / "revocation" / f"{issuer}.asc"
output_file.parent.mkdir(parents=True, exist_ok=True)
debug(f"Writing file {output_file} from {revocation}")
packet_join(packets=[revocation], output=output_file, force=True)
def persist_key_revocations(
key_revocations: Dict[Fingerprint, Path],
key_dir: Path,
) -> None:
"""Persist the key revocation
Parameters
----------
key_revocations: Dictionary with key revocation
key_dir: The root directory below which the revocation is persisted
"""
for issuer, revocation in key_revocations.items():
output_file = key_dir / "revocation" / f"{issuer}.asc"
output_file.parent.mkdir(parents=True, exist_ok=True)
debug(f"Writing file {output_file} from {str(revocation)}")
packet_join(packets=[revocation], output=output_file, force=True)
def persist_direct_key_certifications(
direct_key_certifications: Dict[Fingerprint, List[Path]],
key_dir: Path,
) -> None:
"""Persist the signatures directly on a root key (such as DirectKeys or *Certifications without a User ID) to
file(s)
Parameters
----------
direct_key_certifications: The direct key certifications to write to file
key_dir: The root directory below which the Directkeys are persisted
"""
for issuer, certifications in direct_key_certifications.items():
output_dir = key_dir / "directkey" / "certification" / issuer
output_dir.mkdir(parents=True, exist_ok=True)
for certification in certifications:
creation_time = packet_signature_creation_time(certification).strftime(PACKET_FILENAME_DATETIME_FORMAT)
output_file = output_dir / f"{creation_time}.asc"
debug(f"Writing file {output_file} from {str(certification)}")
packet_join(packets=[certification], output=output_file, force=True)
def persist_direct_key_revocations(
direct_key_revocations: Dict[Fingerprint, List[Path]],
key_dir: Path,
) -> None:
"""Persist the revocations directly on a root key (such as KeyRevocation) to file(s)
Parameters
----------
direct_key_revocations: The direct key revocations to write to file
key_dir: The root directory below which the Directkeys are persisted
"""
for issuer, certifications in direct_key_revocations.items():
output_dir = key_dir / "directkey" / "revocation" / issuer
output_dir.mkdir(parents=True, exist_ok=True)
for certification in certifications:
creation_time = packet_signature_creation_time(certification).strftime(PACKET_FILENAME_DATETIME_FORMAT)
output_file = output_dir / f"{creation_time}.asc"
debug(f"Writing file {output_file} from {str(certification)}")
packet_join(packets=[certification], output=output_file, force=True)
def persist_uid_certifications(
certifications: Dict[Uid, Dict[Fingerprint, List[Path]]],
revocations: Dict[Uid, Dict[Fingerprint, List[Path]]],
key_dir: Path,
) -> None:
"""Persist the certifications of a root key to file(s)
The certifications include all CasualCertifications, GenericCertifications, PersonaCertifications and
PositiveCertifications for all User IDs of the given root key.
All certifications are persisted in per User ID certification directories below key_dir.
Certifications that have a matching revocation are skipped to match behavior of import-clean.
Parameters
----------
certifications: The certifications to write to file
revocations: The revocations to check against if certifications need to be persisted.
key_dir: The root directory below which certifications are persisted
"""
for uid, uid_certifications in certifications.items():
for issuer, issuer_certifications in uid_certifications.items():
# skip certifications if there is a revocation present to match import-clean behavior
if uid in revocations and issuer in revocations[uid] and revocations[uid][issuer]:
continue
certification_dir = key_dir / "uid" / simplify_uid(uid) / "certification"
certification_dir.mkdir(parents=True, exist_ok=True)
certification = latest_certification(issuer_certifications)
output_file = certification_dir / f"{issuer}.asc"
debug(f"Writing file {output_file} from {certification}")
packet_join(packets=[certification], output=output_file, force=True)
def persist_uid_revocations(
revocations: Dict[Uid, Dict[Fingerprint, List[Path]]],
key_dir: Path,
) -> None:
"""Persist the revocations of a root key to file(s)
The revocations include all CertificationRevocations for all User IDs of the given root key.
All revocations are persisted in per User ID 'revocation' directories below key_dir.
Parameters
----------
revocations: The revocations to write to file
key_dir: The root directory below which revocations will be persisted
"""
for uid, uid_revocations in revocations.items():
for issuer, issuer_revocations in uid_revocations.items():
revocation_dir = key_dir / "uid" / simplify_uid(uid) / "revocation"
revocation_dir.mkdir(parents=True, exist_ok=True)
revocation = latest_certification(issuer_revocations)
output_file = revocation_dir / f"{issuer}.asc"
debug(f"Writing file {output_file} from {revocation}")
packet_join(packets=[revocation], output=output_file, force=True)
def derive_username_from_fingerprint(keyring_dir: Path, certificate_fingerprint: Fingerprint) -> Optional[Username]:
"""Attempt to derive the username of a public key fingerprint from a keyring directory
Parameters
----------
keyring_dir: The directory in which to look up a username
certificate_fingerprint: The public key fingerprint to derive the username from
Raises
------
Exception: If more than one username is found (a public key can only belong to one individual)
Returns
-------
A string representing the username a public key certificate belongs to, None otherwise
"""
matches = list(keyring_dir.glob(f"*/*{certificate_fingerprint}"))
if len(matches) > 1:
raise Exception(
f"More than one username found in {keyring_dir} when probing for fingerprint '{certificate_fingerprint}': "
f"{matches}"
)
elif not matches:
debug(f"Can not derive username from target directory for fingerprint {certificate_fingerprint}")
return None
else:
username = matches[0].parent.stem
debug(
f"Successfully derived username '{username}' from target directory for fingerprint "
f"{certificate_fingerprint}"
)
return Username(username)
def convert(
working_dir: Path,
keyring_root: Path,
sources: List[Path],
target_dir: Path,
name_override: Optional[Username] = None,
) -> Path:
"""Convert a path containing PGP certificate material to a decomposed directory structure
Any input is first split by `keyring_split()` into individual certificates.
Parameters
----------
working_dir: A directory to use for temporary files
keyring_root: The keyring root directory to look up accepted fingerprints for certifications
sources: A path to a file or directory to decompose
target_dir: A directory path to write the new directory structure to
name_override: An optional username override for the call to `convert_certificate()`
Returns
-------
The directory that contains the resulting directory structure (target_dir)
"""
directories: List[Path] = []
transform_fd_to_tmpfile(working_dir=working_dir, sources=sources)
keys: Iterable[Path] = set(chain.from_iterable(map(lambda s: s.iterdir() if s.is_dir() else [s], sources)))
fingerprint_filter = set(
get_fingerprints(
working_dir=working_dir,
sources=sources,
paths=[keyring_root] if keyring_root.exists() else [],
).keys()
)
for key in keys:
for cert in keyring_split(working_dir=working_dir, keyring=key, preserve_filename=True):
directories.append(
convert_certificate(
working_dir=working_dir,
certificate=cert,
keyring_dir=target_dir,
name_override=name_override,
fingerprint_filter=fingerprint_filter,
)
)
for path in directories:
user_dir = path.parent
(target_dir / user_dir.name).mkdir(parents=True, exist_ok=True)
copytree(src=user_dir, dst=(target_dir / user_dir.name), dirs_exist_ok=True)
clean_keyring(keyring=target_dir)
return target_dir
def export_ownertrust(certs: List[Path], keyring_root: Path, output: Path) -> List[Fingerprint]:
"""Export ownertrust from a set of keys and return the trusted and revoked fingerprints
The output file format is compatible with `gpg --import-ownertrust` and lists the main fingerprint ID of all
non-revoked keys as fully trusted.
The exported file is used by pacman-key when importing a keyring (see
https://man.archlinux.org/man/pacman-key.8#PROVIDING_A_KEYRING_FOR_IMPORT).
Parameters
----------
certs: The certificates to trust
keyring_root: The keyring root directory to get all accepted fingerprints from
output: The file path to write to
Returns
-------
List of ownertrust fingerprints
"""
main_trusts = certificate_trust_from_paths(
sources=certs,
main_keys=get_fingerprints_from_paths(sources=certs),
all_fingerprints=get_fingerprints_from_paths([keyring_root]),
)
trusted_certs: List[Fingerprint] = filter_fingerprints_by_trust(main_trusts, Trust.full)
with open(file=output, mode="w") as trusted_certs_file:
for cert in sorted(set(trusted_certs)):
debug(f"Writing {cert} to {output}")
trusted_certs_file.write(f"{cert}:4:\n")
return trusted_certs
def export_revoked(certs: List[Path], keyring_root: Path, main_keys: Set[Fingerprint], output: Path) -> None:
"""Export the PGP revoked status from a set of keys
The output file contains the fingerprints of all self-revoked keys and all keys for which at least two revocations
by any main key exist.
The exported file is used by pacman-key when importing a keyring (see
https://man.archlinux.org/man/pacman-key.8#PROVIDING_A_KEYRING_FOR_IMPORT).
Parameters
----------
certs: A list of directories with keys to check for their revocation status
keyring_root: The keyring root directory to get all accepted fingerprints from
main_keys: A list of strings representing the fingerprints of (current and/or revoked) main keys
output: The file path to write to
"""
certificate_trusts = certificate_trust_from_paths(
sources=certs,
main_keys=main_keys,
all_fingerprints=get_fingerprints_from_paths([keyring_root]),
)
revoked_certs: List[Fingerprint] = filter_fingerprints_by_trust(certificate_trusts, Trust.revoked)
with open(file=output, mode="w") as revoked_certs_file:
for cert in sorted(set(revoked_certs)):
debug(f"Writing {cert} to {output}")
revoked_certs_file.write(f"{cert}\n")
def get_fingerprints_from_keyring_files(working_dir: Path, source: Iterable[Path]) -> Dict[Fingerprint, Username]:
"""Get all fingerprints of PGP public keys from import file(s)
Parameters
----------
working_dir: A directory to use for temporary files
source: The path to a source file or directory containing keyrings
Returns
-------
A dict of all fingerprints and their usernames of PGP public keys below path
"""
fingerprints: Dict[Fingerprint, Username] = {}
keys: Iterable[Path] = set(chain.from_iterable(map(lambda s: s.iterdir() if s.is_dir() else [s], source)))
for key in keys:
for certificate in keyring_split(working_dir=working_dir, keyring=key, preserve_filename=True):
for packet in packet_split(working_dir=working_dir, certificate=certificate):
if packet.name.endswith("--PublicKey"):
fingerprints[Fingerprint(packet_dump_field(packet, "Fingerprint"))] = Username(certificate.stem)
debug(f"Fingerprints of PGP public keys in {source}: {fingerprints}")
return fingerprints
def get_fingerprints_from_certificate_directory(
paths: List[Path], prefix: str = "", postfix: str = ""
) -> Dict[Fingerprint, Username]:
"""Get all fingerprints of PGP public keys from decomposed directory structures
Parameters
----------
paths: The path to a decomposed directory structure
prefix: Prefix to add to each username
postfix: Postfix to add to each username
Returns
-------
A dict of all fingerprints and their usernames of PGP public keys below path
"""
fingerprints: Dict[Fingerprint, Username] = {}
for cert in sorted(get_cert_paths(paths)):
fingerprints[Fingerprint(cert.name)] = Username(f"{prefix}{cert.parent.name}{postfix}")
debug(f"Fingerprints of PGP public keys in {paths}: {fingerprints}")
return fingerprints
def get_fingerprints(working_dir: Path, sources: Iterable[Path], paths: List[Path]) -> Dict[Fingerprint, Username]:
"""Get the fingerprints of PGP public keys from input paths and decomposed directory structures
Parameters
----------
working_dir: A directory to use for temporary files
sources: A list of directories or files from which to read PGP keyring information
paths: A list of paths that identify decomposed PGP data in directory structures
Returns
-------
A dict of all fingerprints and their usernames of PGP public keys below path
"""
fingerprints: Dict[Fingerprint, Username] = {}
fingerprints.update(
get_fingerprints_from_keyring_files(
working_dir=working_dir,
source=sources,
)
)
fingerprints.update(get_fingerprints_from_certificate_directory(paths=paths))
return fingerprints
def get_packets_from_path(path: Path) -> List[Path]:
"""Collects packets from one level by appending the root, certifications and revocations.
Parameters
----------
path: Filesystem path used to collect the packets from
Returns
-------
A list of packets ordered by root, certification, revocation
"""
if not path.exists():
return []
packets: List[Path] = []
packets += sorted(path.glob("*.asc"))
certifications = path / "certification"
revocations = path / "revocation"
packets += sorted(certifications.glob("*.asc")) if certifications.exists() else []
packets += sorted(revocations.glob("*.asc")) if revocations.exists() else []
return packets
def get_packets_from_listing(path: Path) -> List[Path]:
"""Collects packets from a listing of directories holding one level each by calling `get_packets_from_path`.
Parameters
----------
path: Filesystem path used as listing to collect the packets from
Returns
-------
A list of packets ordered by root, certification, revocation for each level
"""
if not path.exists():
return []
packets: List[Path] = []
for sub_path in sorted(path.iterdir()):
packets += get_packets_from_path(sub_path)
return packets
def export(
working_dir: Path,
keyring_root: Path,
sources: Optional[List[Path]] = None,
output: Optional[Path] = None,
) -> Optional[str]:
"""Export all provided PGP packet files to a single output file
If sources contains directories, any .asc files below them are considered.
Parameters
----------
working_dir: A directory to use for temporary files
keyring_root: The keyring root directory to look up username shorthand sources
sources: A list of username, fingerprint or directories from which to read PGP packet information
(defaults to `keyring_root`)
output: An output file that all PGP packet data is written to, return the result instead if None
Returns
-------
The result if no output file has been used
"""
if not sources:
sources = [keyring_root]
# transform shorthand paths to actual keyring paths
transform_username_to_keyring_path(keyring_dir=keyring_root / "packager", paths=sources)
transform_fingerprint_to_keyring_path(keyring_root=keyring_root, paths=sources)
temp_dir = Path(mkdtemp(dir=working_dir, prefix="arch-keyringctl-export-join-")).absolute()
cert_paths: Set[Path] = get_cert_paths(sources)
certificates: List[Path] = []
for cert_dir in sorted(cert_paths):
packets: List[Path] = []
packets += get_packets_from_path(cert_dir)
packets += get_packets_from_listing(cert_dir / "subkey")
packets += get_packets_from_listing(cert_dir / "uid")
directkey_path = cert_dir / "directkey"
directkeys = directkey_path.iterdir() if directkey_path.exists() else []
for path in directkeys:
packets += get_packets_from_listing(path)
output_path = temp_dir / f"{cert_dir.name}.asc"
debug(f"Joining {cert_dir} in {output_path}")
packet_join(
packets=packets,
output=output_path,
force=True,
)
certificates.append(output_path)
if not certificates:
return None
return keyring_merge(certificates, output, force=True)
def build(
working_dir: Path,
keyring_root: Path,
target_dir: Path,
) -> None:
"""Build keyring PGP artifacts alongside ownertrust and revoked status files
Parameters
----------
working_dir: A directory to use for temporary files
keyring_root: The keyring root directory to build the artifacts from
target_dir: Output directory that all artifacts are written to
"""
target_dir.mkdir(parents=True, exist_ok=True)
target_dir.touch()
keyring: Path = target_dir / Path("rad4day.gpg")
export(working_dir=working_dir, keyring_root=keyring_root, output=keyring)
trusted_main_keys = export_ownertrust(
certs=[keyring_root / "main"],
keyring_root=keyring_root,
output=target_dir / "rad4day-trusted",
)
export_revoked(
certs=[keyring_root],
keyring_root=keyring_root,
main_keys=set(trusted_main_keys),
output=target_dir / "rad4day-revoked",
)
def list_keyring(
keyring_root: Path,
sources: Optional[List[Path]] = None,
main_keys: bool = False,
trust_filter: TrustFilter = TrustFilter.all,
) -> None:
"""List certificates in the keyring
If sources contains directories, all certificate below them are considered.
Parameters
----------
keyring_root: The keyring root directory to look up username shorthand sources
sources: A list of username, fingerprint or directories from which to read PGP packet information
(defaults to `keyring_root`)
main_keys: List main keys instead of packager keys (defaults to False)
trust_filter: Filter the listing based on trust
"""
keyring_dir = keyring_root / ("main" if main_keys else "packager")
if not sources:
sources = list(sorted(keyring_dir.iterdir(), key=lambda path: path.name.casefold()))
# transform shorthand paths to actual keyring paths
transform_username_to_keyring_path(keyring_dir=keyring_dir, paths=sources)
transform_fingerprint_to_keyring_path(keyring_root=keyring_root, paths=sources)
# resolve all sources to certificate paths
sources = list(sorted(get_cert_paths(sources), key=lambda path: str(path).casefold()))
username_length = max([len(source.parent.name) for source in sources])
for certificate in sources:
username: Username = Username(certificate.parent.name)
trust = certificate_trust(
certificate=certificate,
main_keys=get_fingerprints_from_paths([keyring_root / "main"]),
all_fingerprints=get_fingerprints_from_paths([keyring_root]),
)
if not filter_by_trust(trust=trust, trust_filter=trust_filter):
continue
trust_label = format_trust_label(trust=trust)
print(f"{username:<{username_length}} {certificate.name} {trust_label}")
def inspect_keyring(working_dir: Path, keyring_root: Path, sources: Optional[List[Path]]) -> str:
"""Inspect certificates in the keyring and pretty print the data
If sources contains directories, all certificate below them are considered.
Parameters
----------
working_dir: A directory to use for temporary files
keyring_root: The keyring root directory to look up username shorthand sources
sources: A list of username, fingerprint or directories from which to read PGP packet information
(defaults to `keyring_root`)
Returns
-------
The result of the inspect
"""
if not sources:
sources = [keyring_root]
# transform shorthand paths to actual keyring paths
transform_username_to_keyring_path(keyring_dir=keyring_root / "packager", paths=sources)
transform_fingerprint_to_keyring_path(keyring_root=keyring_root, paths=sources)
with NamedTemporaryFile(dir=working_dir, prefix="packet-", suffix=".asc") as keyring:
keyring_path = Path(keyring.name)
export(working_dir=working_dir, keyring_root=keyring_root, sources=sources, output=keyring_path)
fingerprints: Dict[Fingerprint, Username] = get_fingerprints_from_certificate_directory(
paths=[keyring_root / "packager"]
) | get_fingerprints_from_certificate_directory(
paths=[keyring_root / "main"], postfix=f" {Color.BOLD.value}(main){Color.RST.value}"
)
main_keys = get_fingerprints_from_paths([keyring_root / "main"])
all_fingerprints = get_fingerprints_from_paths([keyring_root])
trusts: Dict[Fingerprint, Trust] = certificate_trust_from_paths(
sources=[keyring_root], main_keys=main_keys, all_fingerprints=all_fingerprints
)
for fingerprint in fingerprints.keys():
trust = trusts[fingerprint]
fingerprints[fingerprint] = Username(
f"{trust_color(trust=trust).value}{fingerprints[fingerprint]} {format_trust_label(trust=trust)}"
)
return inspect(
packet=keyring_path,
certifications=True,
fingerprints=fingerprints,
)
def get_fingerprints_from_paths(sources: Iterable[Path]) -> Set[Fingerprint]:
"""Get the fingerprints of all certificates found in the sources paths.
Parameters
----------
sources: A list of directories from which to get fingerprints of the certificates.
Returns
-------
The list of all fingerprints obtained from the sources.
"""
return set([Fingerprint(cert.name) for cert in get_cert_paths(sources)])