Alexander Hess
8ece401276
- Make OpenPGP only one of many protocols + KEYS.md only holds the current keys + OPENPGP.md describes all OpenPGP details - Make the current public key available at the root - Add scripts/ to automate the various steps: + bootstrap.sh + publish.sh + sign.sh + snapshot.sh + verify.sh
103 lines
2.2 KiB
Shell
Executable file
103 lines
2.2 KiB
Shell
Executable file
#!/bin/sh
|
|
|
|
# Verify the signed files in this repo against the pinned [S] subkey
|
|
#
|
|
# Usage: ./scripts/verify.sh [FILE...]
|
|
#
|
|
# FILE defaults to KEYS.md OPENPGP.md ceremonies/*.md
|
|
#
|
|
# A FILE with a FILE.asc next to it is checked as a detached signature,
|
|
# any other FILE as a clearsigned document
|
|
#
|
|
# Also checks the key's expiry
|
|
#
|
|
# Exits non-zero if any file lacks a valid signature from the pinned key,
|
|
# or if the key has expired
|
|
|
|
set -eu
|
|
|
|
|
|
# Internal [S] subkey; every file must carry a valid signature from this key
|
|
SIGNING_KEY='D6D1989DF1F6B23FD776293DB46EDB4DFC26805D'
|
|
|
|
|
|
# Warn when the key expires within this many days
|
|
WARN_DAYS=60
|
|
|
|
|
|
REPO=$(cd "$(dirname "$0")/.." && pwd)
|
|
|
|
|
|
if [ $# -eq 0 ]; then
|
|
set -- \
|
|
"$REPO/KEYS.md" \
|
|
"$REPO/OPENPGP.md" \
|
|
"$REPO"/ceremonies/*.md \
|
|
# Keep this list aligned with the documentation at the top
|
|
fi
|
|
|
|
|
|
# Print the fingerprints of all keys that made a valid signature, one per line
|
|
signers() {
|
|
gpg \
|
|
--status-fd 1 \
|
|
--verify "$@" \
|
|
2>/dev/null \
|
|
| awk '$2 == "VALIDSIG" { print $3 }'
|
|
}
|
|
|
|
|
|
FAILED=0
|
|
|
|
|
|
for FILE; do
|
|
|
|
if [ ! -f "$FILE" ]; then
|
|
echo "Error: $FILE not found" >&2
|
|
exit 1
|
|
fi
|
|
|
|
if [ -f "$FILE.asc" ]; then
|
|
SIGNERS=$(signers "$FILE.asc" "$FILE")
|
|
else
|
|
SIGNERS=$(signers "$FILE")
|
|
fi
|
|
|
|
if printf '%s\n' "$SIGNERS" | grep -qx "$SIGNING_KEY"; then
|
|
echo "OK $FILE"
|
|
else
|
|
echo "FAIL $FILE (signed by: $(printf '%s' "${SIGNERS:-nobody}" | tr '\n' ' '))" >&2
|
|
FAILED=1
|
|
fi
|
|
|
|
done
|
|
|
|
|
|
# Notes:
|
|
# - The 7th field of the pub line is the primary key's expiry in epoch seconds
|
|
# - A subkey resolves to the primary key
|
|
|
|
EXPIRY=$(gpg --list-keys --with-colons "$SIGNING_KEY" \
|
|
| awk -F: '$1 == "pub" { print $7; exit }')
|
|
|
|
if [ -z "$EXPIRY" ]; then
|
|
echo "Error: No expiry found for key $SIGNING_KEY" >&2
|
|
exit 1
|
|
fi
|
|
|
|
NOW=$(date -u +%s)
|
|
|
|
DAYS_LEFT=$(( (EXPIRY - NOW) / 86400 ))
|
|
|
|
|
|
if [ "$EXPIRY" -le "$NOW" ]; then
|
|
echo "FAIL Key expired $(( (NOW - EXPIRY) / 86400 )) days ago" >&2
|
|
FAILED=1
|
|
elif [ "$DAYS_LEFT" -lt "$WARN_DAYS" ]; then
|
|
echo "WARN Key expires in $DAYS_LEFT days" >&2
|
|
else
|
|
echo "OK Key expires in $DAYS_LEFT days"
|
|
fi
|
|
|
|
|
|
exit "$FAILED"
|