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#!/bin/sh
# fetch.sh fetch and verify certificates from an HTTP endpoint
# This is meant to be used with the ACME
set -e
verbose() {
if [ $_verbose -ne 0 ] ; then
return 0
fi
return 1
}
cleanup() {
verbose && echo "Removing $_tmpdir"
rm -rf "$_tmpdir" || echo
exit 0
}
_curl='curl -sS'
fullchainf=
certfile=
keyfile=
fetchurl=
domain=
encryptionKeyFile=
signatureKeyFile=
_verbose=0
_tmpdir="$(mktemp -d)"
help() {
cat <<EOF
$0 -f <fullchain> -c <certfile> -k <keyfile> -u <fetchURL> -d <domain>
-K <encryptionKeyFile> -S <signatureKeyFile> [-v]
Optionally, AGE_ENCRYPTION_KEY and SIGNIFY_KEY can be set and
the contents of the environment variables will be used as key files
instead.
-v is verbose.
EOF
exit 1
}
#shellcheck disable=SC2034
while [ $# -gt 0 ] ; do case $1 in
-f) fullchainf="$2"; shift ; shift ;;
-c) certfile="$2"; shift ; shift ;;
-k) keyfile="$2"; shift ; shift ;;
-u) fetchurl="$2"; shift ; shift ;;
-d) domain="$2"; shift ; shift ;;
-K) encryptionKeyFile="$2"; shift ; shift ;;
-S) signatureKeyFile="$2"; shift ; shift ;;
-v) _verbose=1; shift ;;
*) help ;;
esac ; done
cd "$_tmpdir"
if [ -n "$AGE_ENCRYPTION_KEY" ] ; then
encryptionKeyFile="age.key"
chmod 600 "$encryptionKeyFile"
echo "$AGE_ENCRYPTION_KEY" > "$encryptionKeyFile"
fi
if [ -n "$SIGNIFY_KEY" ] ; then
signatureKeyFile="signify.sig"
chmod 600 "$signatureKeyFile"
echo "$SIGNIFY_KEY" > "$signatureKeyFile"
fi
cd -
err=0
for opt in fullchainf certfile keyfile fetchurl domain \
encryptionKeyFile signatureKeyFile ; do
eval val="\$$opt"
#shellcheck disable=SC2154
if [ -z "$val" ] ; then
echo "Missing $opt"
err=1
fi
done
if [ $err -ne 0 ] ; then
echo "missing required arguments"
exit 1;
fi
encryptionKeyFile="$(realpath "$encryptionKeyFile")"
signatureKeyFile="$(realpath "$signatureKeyFile")"
[ -e "$keyfile" ] && keyfile="$(realpath "$keyfile")"
[ -e "$fullchainf" ] && fullchainf="$(realpath "$fullchainf")"
[ -e "$certfile" ] && certfile="$(realpath "$certfile")"
if ! [ -e "$keyfile" ] ; then
echo "Warning: no key file found" >&2
fi
if ! [ -e "$fullchainf" ] ; then
echo "Warning: no fullchain file found" >&2
fi
if ! [ -e "$certfile" ] ; then
echo "Warning: no cert file found" >&2
fi
cd "$_tmpdir"
trap cleanup EXIT INT
verbose && echo Fetching checkums...
$_curl "${fetchurl}/${domain}.sha256sum" > "${domain}.sha256sum"
$_curl "${fetchurl}/${domain}.sha256sum.sig" > "${domain}.sha256sum.sig"
signify -V -p "$signatureKeyFile" -m "${domain}.sha256sum"
verbose && echo "Checksums OK"
ok=0
checksum="$(sha256sum "$keyfile" | awk '{print $1}')"
if grep -q "$checksum" "${domain}".sha256sum ; then
verbose && echo "Current key file \"$keyfile\" OK"
ok=$((ok + 1))
fi
checksum="$(sha256sum "$fullchainf" | awk '{print $1}')"
if grep -q "$checksum" "${domain}".sha256sum ; then
verbose && echo "Current fullchain file \"$fullchainf\" ok"
ok=$((ok + 1))
fi
checksum="$(sha256sum "$certfile" | awk '{print $1}')"
if grep -q "$checksum" "${domain}".sha256sum ; then
verbose && echo "Current cert file \"$certfile\" ok"
ok=$((ok + 1))
fi
if [ $ok -eq 3 ] ; then
verbose && echo "All files appear okay, exiting"
exit 0
fi
for _f in fullchain cer key.enc ; do
verbose && echo "Fetching ${_f}..."
$_curl "${fetchurl}/${domain}.${_f}" > "${domain}.$_f"
done
verbose && echo "Decrypting key"
age -i "$encryptionKeyFile" -d "${domain}.key.enc" > "${domain}".key
verbose && echo "Validating checksum for downloaded files"
sha256sum -c "${domain}.sha256sum"
verbose && echo "Updating files"
cat < "${domain}".fullchain > "$fullchainf"
cat < "${domain}".cer > "$certfile"
cat < "${domain}.key" > "$keyfile"
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