Re: opensmtpd-filter-dkimsign-0.5

[latincom]

> In addition to Stuart's comment, you could checkout pkg readme:
>
> */usr/local/share/doc/pkg-readmes/opensmtpd-filter-dkimsign*
>

Hello

Could you please show me where is the answer to my question?

"+-----------------------------------------------------------------------
| Running opensmtpd-filter-dkimsign on OpenBSD
+-----------------------------------------------------------------------

To use filter-dkimsign, you must first generate a private key:

  doas -u _dkimsign openssl genrsa -out /etc/mail/dkim/private.rsa.key 2048

To generate the public key ready for dns:

  openssl rsa -in /etc/mail/dkim/private.rsa.key -pubout | \
    sed '1s/.*/v=DKIM1;p=/;:nl;${s/-----.*//;q;};N;s/\n//g;b nl;'

This value needs to be placed in a DNS txt record with the following syntax:
   <selector>._domainkey.<domain>

Edit the /etc/mail/smtpd.conf file to declare the filter:

  filter dkimsign_rsa proc-exec "filter-dkimsign -d <domain> -s <selector>
-k /etc/mail/dkim/private.rsa.key" user _dkimsign group _dkimsign

Then add the filter to each listener that should be signed:

  listen on all filter dkimsign_rsa

To use Ed25519 similar steps must be taken.

  Make sure the ed25519 flavor of opensmtpd-filter-dkimsign is installed.

To generate the private key:

  doas -u _dkimsign eopenssl11 genpkey -algorithm ed25519 -outform PEM
-out /etc/mail/dkim/private.ed25519.key

To generate the public key ready for dns:

  printf "v=DKIM1;k=ed25519;p=%s" "$(eopenssl11 pkey -outform DER -pubout
-in /etc/mail/dkim/private.ed25519.key | tail -c +13 | openssl base64)"

Edit the /etc/mail/smtpd.conf file to declare the filter:

  filter dkimsign_ed25519 proc-exec "filter-dkimsign -a ed25519-sha256 -d
<domain> -s <selector> -k /etc/mail/dkim/private.ed25519.key" user
_dkimsign group _dkimsign

To add both filters to each listener that should be signed:

  filter dkimsign chain { dkimsign_rsa, dkimsign_ed25519 }
  listen on all filter dkimsign

For a full list of options see filter-dkimsign(8).

Let me show you an error:
This command, only works with "doas"! It does not work directly as root!
I do not use doas.

"doas -u _dkimsign openssl genrsa -out /etc/mail/dkim/private.rsa.key 2048"

Thanks