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pmb.install.format: use mkstemp

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mktemp() is, according to the Python docs, not secure and probably
shouldn't be used for something sensitive like a password. This should
also make the opeartion atomic and prevent TOCTOU race conditions.

Co-Developed-by: Stefan Hansson <newbyte@postmarketos.org>
This commit is contained in:
Clayton Craft 2025-06-10 16:00:18 -07:00 • committed by Stefan Hansson
parent ed396475f5
commit b917095547
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1 changed files with 3 additions and 3 deletions
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6
pmb/install/format.py
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@ -71,10 +71,10 @@ def format_luks_root(args: PmbArgs, device: str) -> None:
fde_key = os.environ.get("PMB_FDE_PASSWORD", None)
if fde_key:
# Write passphrase to a temp file, to avoid printing it in any log
path = tempfile.mktemp(dir="/tmp")
path_outside = Chroot.native() / path
with open(path_outside, "w", encoding="utf-8") as handle:
fd, path = tempfile.mkstemp(dir=Chroot.native().path, text=True)
with os.fdopen(fd) as handle:
handle.write(f"{fde_key}")
os.close(fd)
format_cmd += [str(path)]
open_cmd += ["--key-file", str(path)]