Actualmente estoy configurando un servidor de correo electrónico personal algo único usando OpenSMTPd. Tengo un servidor local (Raspberry Pi) y un servidor remoto (VPS). Los correos electrónicos que me envían se envían al servidor remoto y luego se retransmiten a mi servidor local. Cuando envío un correo electrónico, va desde mi servidor local al servidor remoto y luego se transmite a su destinatario. Actualmente solo estoy probando el correo entrante y en su mayoría funciona, con un solo problema, tls.
Si tengo "tls-require" configurado en mi servidor local, mis servidores remotos parecen poder conectarse, pero luego se desconectan e intentan degradar a simple (smtp+notls), lo que por supuesto falla. Si uso "tls" en lugar de "tls-require", sucede lo mismo, pero el intento smtp+notls funciona.
Los mensajes de error no parecen tan útiles. En el servidor remoto aparece "Error de TLS oportunista, se degrada a simple". Como dije antes, en el servidor local parece que la conexión FUE exitosa (al menos eso creo), pero luego se desconecta:
smtp connected address=redacted.remote.ip.address host=mx1.mydomain.tld
smtp tls ciphers=TLSv1.3:TLS_AES_256_GCM_SHA384:256
smtp disconnected reason=disconnect
Recibo un mensaje de error algo más informativo si intento enviar el correo electrónico usando openssl (desde el servidor remoto).
openssl s_client -debug -starttls smtp -crlf -connect redacted.local.ip.address:25
En el servidor remoto todo va bien hasta que ingreso un destinatario, momento en el que aparece un error de SSL:
RCPT TO:<[email protected]>
RENEGOTIATING
17412933263728:error:1404C042:SSL routines:ST_OK:called a function you should not call:/usr/src/lib/libssl/ssl_lib.c:2529:
Ese error parece decirme más, pero no encuentro nada relevante al respecto. El servidor local muestra exactamente el mismo error que antes.
Sé que mucha gente no usa TLS obligatorio con el correo electrónico, pero para este caso de uso realmente me gustaría que funcione.
Mi servidor local ejecuta "Raspberry Pi OS 11 bullseye de 64 bits" y OpenSMTPD 6.8.0p2 (la última versión en apt).
Mi servidor remoto ejecuta "OpenBSD 7.0 GENERIC#224 amd64" y OpenSMTPD 7.0.0.
Cualquier consejo sería muy apreciado. Por favor, avíseme si necesita más información.
Aquí están mis configuraciones:
SERVIDOR LOCAL smtpd.conf:
table aliases "/etc/smtpd/aliases"
table domains "/etc/smtpd/domains"
table passwds "/etc/smtpd/passwds"
table remote-servers "/etc/smtpd/remote-servers"
pki "mydomain.tld" cert "/etc/letsencrypt/live/mydomain.tld/fullchain.pem"
pki "mydomain.tld" key "/etc/letsencrypt/live/mydomain.tld/privkey.pem"
# Do I want srs here, on the remote, or both?
srs key "redacted key"
filter "rdns" phase connect match !rdns disconnect "550 DNS error"
filter "fcrdns" phase connect match !fcrdns disconnect "550 DNS error"
filter "rspamd" proc-exec "/etc/smtpd/filter-rspamd"
# Inbound
listen on eth0 port 25 tls-require pki "mydomain.tld" filter { "rdns", "fcrdns" "rspamd" }
#listen on eth0 port 25 tls pki "mydomain.tld" filter { "rdns", "fcrdns" "rspamd" }
action "RECV" lmtp "/var/run/dovecot/lmtp" rcpt-to virtual <aliases>
match from src <remote-servers> for domain <domains> action "RECV"
match !from src <remote-servers> for domain <domains> reject
# Outbound
listen on eth0 port 465 smtps pki "mydomain.tld" auth <passwds> filter "rspamd" mask-src
listen on eth0 port 587 tls-require pki "mydomain.tld" auth <passwds> filter "rspamd" mask-src
action "SEND" relay host mx1.mydomain.tld:465
match from any auth for any action "SEND"
SERVIDOR REMOTO smtpd.conf:
table aliases "/etc/smtpd/aliases"
table domains "/etc/smtpd/domains"
pki "mydomain.tld" cert "/etc/letsencrypt/live/mydomain.tld/fullchain.pem"
pki "mydomain.tld" key "/etc/letsencrypt/live/mydomain.tld/privkey.pem"
# Do I want srs here, on the remote, or both?
srs key "same redacted key"
filter "rdns" phase connect match !rdns disconnect "550 DNS error"
filter "fcrdns" phase connect match !fcrdns disconnect "550 DNS error"
# Inbound
listen on eth0 port 25 tls pki "mydomain.tld" filter { "rdns", "fcrdns" }
action "RECV" relay host redacted.local.ip.address:25
match from any for domain <domains> action "RECV"
# Outbound
listen on eth0 port 465 smtps pki "mydomain.tld" mask-src
action "SEND" relay srs
match from src redacted.local.ip.address for any action "SEND"
match !from src redacted.local.ip.address for any reject
Aquí están los registros de correo si los tengo."tls-require"colocar:
Registro de correo del SERVIDOR LOCAL:
Apr 3 11:57:26 LocalHostname smtpd[3614276]: 3c3d3943d2bc7134 smtp connected address=redacted.remote.ip.address host=mx1.mydomain.tld
Apr 3 11:57:26 LocalHostname smtpd[3614276]: 3c3d3943d2bc7134 smtp tls ciphers=TLSv1.3:TLS_AES_256_GCM_SHA384:256
Apr 3 11:57:26 LocalHostname smtpd[3614276]: 3c3d3943d2bc7134 smtp disconnected reason=disconnect
Apr 3 11:57:26 LocalHostname smtpd[3614276]: 3c3d39441db05cc1 smtp connected address=redacted.remote.ip.address host=mx1.mydomain.tld
Apr 3 11:57:26 LocalHostname smtpd[3614276]: 3c3d39441db05cc1 smtp failed-command command="MAIL FROM:<[email protected]>" result="530 5.5.1 Invalid command: Must issue a STARTTLS command first"
Apr 3 11:57:43 LocalHostname smtpd[3614276]: 3c3d39441db05cc1 smtp disconnected reason=quit
Registro de correo del SERVIDOR REMOTO:
Apr 3 11:57:19 RemoteHostname smtpd[94758]: 7349563019b45aeb smtp connected address=209.85.128.178 host=mail-yw1-f178.google.com
Apr 3 11:57:19 RemoteHostname smtpd[94758]: 7349563019b45aeb smtp tls ciphers=TLSv1.3:AEAD-AES256-GCM-SHA384:256
Apr 3 11:57:20 RemoteHostname smtpd[94758]: 7349563019b45aeb smtp message msgid=f8226363 size=2682 nrcpt=1 proto=ESMTP
Apr 3 11:57:20 RemoteHostname smtpd[94758]: 7349563019b45aeb smtp envelope evpid=f822636342a8821f from=<[email protected]> to=<[email protected]>
Apr 3 11:57:20 RemoteHostname smtpd[94758]: 734956336de69e03 mta connecting address=smtp://redacted.local.ip.address:25 host=redacted-local-ip-address.isp.tld
Apr 3 11:57:20 RemoteHostname smtpd[94758]: 734956336de69e03 mta connected
Apr 3 11:57:20 RemoteHostname smtpd[94758]: 7349563019b45aeb smtp disconnected reason=quit
Apr 3 11:57:20 RemoteHostname smtpd[94758]: smtp-out: Error on session 734956336de69e03: opportunistic TLS failed, downgrading to plain
Apr 3 11:57:20 RemoteHostname smtpd[94758]: 734956336de69e03 mta connecting address=smtp+notls://redacted.local.ip.address:25 host=redacted-local-ip-address.isp.tld
Apr 3 11:57:20 RemoteHostname smtpd[94758]: 734956336de69e03 mta connected
Apr 3 11:57:20 RemoteHostname smtpd[94758]: 734956336de69e03 mta delivery evpid=f822636342a8821f from=<[email protected]> to=<[email protected]> rcpt=<-> source="redacted.remote.ip.address" relay="redacted.local.ip.address (redacted-local-ip-address.isp.tld)" delay=1s result="PermFail" stat="530 5.5.1 Invalid command: Must issue a STARTTLS command first"
Apr 3 11:57:22 RemoteHostname smtpd[94758]: 73495634e55adfe9 smtp connected address=local host=mx1.mydomain.tld
Apr 3 11:57:22 RemoteHostname smtpd[94758]: 73495634e55adfe9 smtp failed-command command="RCPT TO: <[email protected]>" result="550 Invalid recipient: <[email protected]>"
Apr 3 11:57:22 RemoteHostname smtpd[11238]: warn: PermFail injecting failure report on message f8226363 to <[email protected]> for 1 envelope: 550 Invalid recipient: <[email protected]>
Apr 3 11:57:22 RemoteHostname smtpd[94758]: 73495634e55adfe9 smtp disconnected reason=quit
Apr 3 11:57:37 RemoteHostname smtpd[94758]: 734956336de69e03 mta disconnected reason=quit messages=0
Y estos son los registros de correo si solo tengo"tls"colocar:
Registro de correo del SERVIDOR LOCAL:
Apr 3 12:07:09 LocalHostname smtpd[3849290]: b981307e92d2eeac smtp connected address=redacted.remote.ip.address host=mx1.mydomain.tld
Apr 3 12:07:09 LocalHostname smtpd[3849290]: b981307e92d2eeac smtp tls ciphers=TLSv1.3:TLS_AES_256_GCM_SHA384:256
Apr 3 12:07:09 LocalHostname smtpd[3849290]: b981307e92d2eeac smtp disconnected reason=disconnect
Apr 3 12:07:09 LocalHostname smtpd[3849290]: b981307ff6e18ae3 smtp connected address=redacted.remote.ip.address host=mx1.mydomain.tld
Apr 3 12:07:10 LocalHostname smtpd[3849290]: b981307ff6e18ae3 smtp message msgid=082c7a5e size=2850 nrcpt=1 proto=ESMTP
Apr 3 12:07:10 LocalHostname smtpd[3849290]: b981307ff6e18ae3 smtp envelope evpid=082c7a5e9dec905f from=<[email protected]> to=<[email protected]>
Apr 3 12:07:11 LocalHostname dovecot: lmtp(3967460): Connect from local
Apr 3 12:07:11 LocalHostname dovecot: lmtp([email protected])<3967460><hmVpIN9/SWLkiTwAmV7YnQ>: msgid=<CACebY1Hm4jdhjFKoZ2374zbEq1MZV-yTxsUauV4gzxXqNBVeaQ@mail.gmail.com>: saved mail to INBOX
Apr 3 12:07:11 LocalHostname dovecot: lmtp(3967460): Disconnect from local: Client has quit the connection (state=READY)
Apr 3 12:07:11 LocalHostname smtpd[3849290]: b981308066da2115 mda delivery evpid=082c7a5e9dec905f from=<[email protected]> to=<[email protected]> rcpt=<[email protected]> user=vmail delay=2s result=Ok stat=Delivered
Apr 3 12:07:27 LocalHostname smtpd[3849290]: b981307ff6e18ae3 smtp disconnected reason=quit
Registro de correo del SERVIDOR REMOTO:
Apr 3 12:06:59 RemoteHostname smtpd[94758]: 73495635c8c7456b smtp connected address=209.85.219.174 host=mail-yb1-f174.google.com
Apr 3 12:06:59 RemoteHostname smtpd[94758]: 73495635c8c7456b smtp tls ciphers=TLSv1.3:AEAD-AES256-GCM-SHA384:256
Apr 3 12:07:00 RemoteHostname smtpd[94758]: 73495635c8c7456b smtp message msgid=b912e335 size=2670 nrcpt=1 proto=ESMTP
Apr 3 12:07:00 RemoteHostname smtpd[94758]: 73495635c8c7456b smtp envelope evpid=b912e33501250790 from=<[email protected]> to=<[email protected]>
Apr 3 12:07:00 RemoteHostname smtpd[94758]: 7349563834c66e1a mta connecting address=smtp://redacted.local.ip.address:25 host=redacted-local-ip-address.isp.tld
Apr 3 12:07:00 RemoteHostname smtpd[94758]: 7349563834c66e1a mta connected
Apr 3 12:07:00 RemoteHostname smtpd[94758]: 73495635c8c7456b smtp disconnected reason=quit
Apr 3 12:07:00 RemoteHostname smtpd[94758]: smtp-out: Error on session 7349563834c66e1a: opportunistic TLS failed, downgrading to plain
Apr 3 12:07:00 RemoteHostname smtpd[94758]: 7349563834c66e1a mta connecting address=smtp+notls://redacted.local.ip.address:25 host=redacted-local-ip-address.isp.tld
Apr 3 12:07:00 RemoteHostname smtpd[94758]: 7349563834c66e1a mta connected
Apr 3 12:07:02 RemoteHostname smtpd[94758]: 7349563834c66e1a mta delivery evpid=b912e33501250790 from=<[email protected]> to=<[email protected]> rcpt=<-> source="redacted.remote.ip.address" relay="redacted.local.ip.address (redacted-local-ip-address.isp.tld)" delay=2s result="Ok" stat="250 2.0.0 082c7a5e Message accepted for delivery"
Apr 3 12:07:19 RemoteHostname smtpd[94758]: 7349563834c66e1a mta disconnected reason=quit messages=1
SERVIDOR REMOTO pf.conf:
# $OpenBSD: pf.conf,v 1.55 2017/12/03 20:40:04 sthen Exp $
#
# See pf.conf(5) and /etc/examples/pf.conf
set skip on lo
block return # block stateless traffic
pass # establish keep-state
# By default, do not permit remote connections to X11
block return in on ! lo0 proto tcp to port 6000:6010
# Port build user does not need network
block return out log proto {tcp udp} user _pbuild