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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:
# - privkey
# - pubkey
# - txt record to be used in dns
#
# Example/intended usage:
# dkimfiles = `$nl{dkim/mkcert <selector>}
# privkey = $dkimfiles(1)
# txtfile = $dkimfiles(2)
#
# There is no real need for the pubkey to be stored as its own file.
dir = /etc/mail/dkim
user =_dkimsign_
selector = $1
privkey = $dir/$selector.priv.key
pubkey = $dir/$selector.pub.key
txt = $dir/$selector.txt
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 {
as rm $privkey
as rm $pubkey
as rm $txt
}
fn as {
doas -u _dkimsign $*
}
if (!~ $#* 1) {
err 'usage: mkcert <selector>'
exit 2
}
as test -e $privkey && die $privkey already exists
as test -e $pubkey && die $pubkey already exists
as test -e $txt && die $txt already exists
mustsucceed as mkdir -p $dir
mustsucceed as openssl genrsa -out $privkey
mustsucceed as openssl rsa -in $privkey -pubout | \
mustsucceed as tee $pubkey >/dev/null
mustsucceed as cat $pubkey | \
mustsucceed as sed '1s/.*/v=DKIM1;p=/;:nl;${s/-----.*//;q;};N;s/\n//g;b nl;' | \
mustsucceed as tee $txt >/dev/null
err 'Paths generated (privkey, pubkey, txt dns record):'
echo $privkey
echo $pubkey
echo $txt
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