# 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("archlinux.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 / "archlinux-trusted", ) export_revoked( certs=[keyring_root], keyring_root=keyring_root, main_keys=set(trusted_main_keys), output=target_dir / "archlinux-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)])