xavierk
b47a65c91e
Every release is built from its tag alone by packaging/void/build-release.sh, shared by the tag workflow and local dry runs. Signs in a network-less container with the key mounted read-only and publishes to the tag release and the rolling latest release.
96 lines
3.2 KiB
Python
Executable File
96 lines
3.2 KiB
Python
Executable File
#!/usr/bin/env python3
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"""xbps repository-key helper for packaging/void/build-release.sh.
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xbps-fingerprint.py fingerprint PEM
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print the xbps fingerprint of an RSA public key (PEM): the MD5 of the
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ssh-rsa blob of the key, the identifier libxbps calls xbps_pubkey2fp.
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xbps-fingerprint.py plist PEM SIGNER OUT
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write the client key plist xbps expects for that public key. Used only
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for a throwaway smoke key; the release publishes the committed
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repository-key.plist byte for byte.
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Only the public key is ever read here. Run with -I: the interpreter must not
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pick up modules from the directory a downloaded file sits in.
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"""
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from __future__ import annotations
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import hashlib
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import plistlib
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import re
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import struct
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import subprocess
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import sys
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from pathlib import Path
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def _rsa_numbers(pem: Path) -> tuple[int, int]:
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"""Modulus and exponent of a PEM public key, read through openssl."""
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text = subprocess.run(
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["openssl", "rsa", "-pubin", "-in", str(pem), "-noout", "-text"],
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check=True,
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capture_output=True,
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text=True,
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).stdout
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modulus_hex: list[str] = []
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exponent = None
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in_modulus = False
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for line in text.splitlines():
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stripped = line.strip()
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if stripped.startswith("Modulus"):
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in_modulus = True
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continue
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if stripped.startswith("Exponent"):
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in_modulus = False
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exponent = int(stripped.split()[1])
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continue
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if in_modulus and re.fullmatch(r"[0-9a-f:]+", stripped):
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modulus_hex.append(stripped.replace(":", ""))
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if exponent is None or not modulus_hex:
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raise SystemExit(f"xbps-fingerprint.py: not an RSA public key: {pem}")
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return int("".join(modulus_hex), 16), exponent
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def _mpint(value: int) -> bytes:
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"""An SSH mpint: big-endian, with a leading zero when the top bit is set."""
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raw = value.to_bytes((value.bit_length() + 7) // 8, "big")
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if raw[0] & 0x80:
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raw = b"\x00" + raw
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return struct.pack(">I", len(raw)) + raw
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def fingerprint(pem: Path) -> str:
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"""Colon-separated lowercase MD5 of the ssh-rsa blob of the key."""
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modulus, exponent = _rsa_numbers(pem)
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blob = struct.pack(">I", 7) + b"ssh-rsa" + _mpint(exponent) + _mpint(modulus)
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digest = hashlib.md5(blob, usedforsecurity=False).hexdigest()
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return ":".join(digest[i : i + 2] for i in range(0, len(digest), 2))
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def write_plist(pem: Path, signer: str, out: Path) -> None:
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"""Write the client key plist xbps reads from /var/db/xbps/keys."""
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modulus, _ = _rsa_numbers(pem)
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entry = {
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"public-key": pem.read_bytes(),
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"public-key-size": modulus.bit_length(),
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"signature-by": signer,
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}
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with out.open("wb") as handle:
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plistlib.dump(entry, handle, fmt=plistlib.FMT_XML)
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def main(argv: list[str]) -> int:
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if len(argv) == 2 and argv[0] == "fingerprint":
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print(fingerprint(Path(argv[1])))
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return 0
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if len(argv) == 4 and argv[0] == "plist":
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write_plist(Path(argv[1]), argv[2], Path(argv[3]))
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return 0
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print(__doc__, file=sys.stderr)
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return 2
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if __name__ == "__main__":
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raise SystemExit(main(sys.argv[1:]))
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