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#!/bin/rc
# This script generates and stores DKIM keypair, using the correct user
# It outputs all paths generated in the following order for each algorithm:
# - privkey
# - txt record to be used in dns
#
# Example/intended usage:
# dkimfiles = `$nl{dkim/mkcert <selector>}
# rsakey = $dkimfiles(1)
# rsatxt = $dkimfiles(2)
# edkey = $dkimfiles(3)
# edtxt = $dkimfiles(4)
dir = /etc/mail/dkim
user =_dkimsign_
selector = $1
ed = ed25519
rsaprivkey = $dir/$selector.rsa.priv.key
rsapubkey = $dir/$selector.rsa.pub.key
rsatxt = $dir/$selector.rsa.txt
edprivkey = $dir/$selector.$ed.priv.key
edpubkey = $dir/$selector.$ed.pub.key
edtxt = $dir/$selector.$ed.txt
files = ( $rsaprivkey $rsapubkey $rsatxt \
$edprivkey $edpubkey $edtxt )
fn err {
echo $* >[1=2]
}
fn die {
err fatal error: $*
exit 1
}
fn mustsucceed {
if (!$*) {
err fatal error: essential command failed
cleanupfailed
exit 1
}
}
fn cleanupfailed {
for (f in $files) {
as rm $f [2]>/dev/null
}
}
fn as {
doas -u _dkimsign $*
}
if (!~ $#* 1) {
err 'usage: mkcert <selector>'
exit 2
}
for (f in $files) {
as test -e $f && die $f already exists
}
mustsucceed as mkdir -p $dir
# RSA
mustsucceed as openssl genrsa -out $rsaprivkey
mustsucceed as openssl rsa -in $rsaprivkey -pubout | \
mustsucceed as tee $rsapubkey >/dev/null
mustsucceed as cat $rsapubkey | \
mustsucceed as sed '1s/.*/v=DKIM1;p=/;:nl;${s/-----.*//;q;};N;s/\n//g;b nl;' | \
mustsucceed as tee $rsatxt >/dev/null
# ED25519
mustsucceed as openssl genpkey -algorithm $ed -out $edprivkey
mustsucceed as openssl pkey -outform DER -pubout -in $edprivkey | \
mustsucceed tail -c +13 | mustsucceed openssl base64 | \
mustsucceed as tee $edpubkey >/dev/null
mustsucceed printf 'v=DKIM1;k=%s;p=%s\n' $ed `$nl{mustsucceed as cat $edpubkey} | \
mustsucceed as tee $edtxt >/dev/null
err 'Paths generated (rsa privkey, rsa dns record, ed25519 privkey, ed25519 dns record):'
echo $rsaprivkey
echo $rsatxt
echo $edprivkey
echo $edtxt
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