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Postfix Configurer pour utiliser TLSV1.2

Je commence à construire mon premier serveur de cloud: Ubuntu 16.04 avec Postfix.

La question est de savoir comment puis-je configurer Postfix pour utiliser tlsv1.2 lorsque j'envoie du courrier de ma boutique en ligne?

Lorsque mon webshop envoie mail à mon serveur Postfix, il utilise TLSV1 ici est journal:

postfix/submission/smtpd[19111]: Anonymous TLS connection established from domainname.com[xxx.xxx.xxx.xxx]: TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)

dans ma boutique Web, je suis défini dans Config: Utilisez: Port TLS: 587

Merci j

My server info:
Ubuntu 16.04
postfix:
  Installed: 3.1.0-3

openssl:
  Installed: 1.0.2h-1+deb.sury.org~xenial+1

Voici le journal de Postfix: peut voir le courrier avec TLSV1 ... :(

Sep 19 19:10:56 ubuntu postfix/master[6992]: daemon started -- version 3.1.0, configuration /etc/postfix
Sep 19 19:11:04 ubuntu postfix/submission/smtpd[7126]: connect from domainname.com[xxx.xxx.xxx.xxx]
Sep 19 19:11:04 ubuntu postfix/submission/smtpd[7126]: Anonymous TLS connection established from domainname.com[xxx.xxx.xxx.xxx]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Sep 19 19:11:04 ubuntu postfix/submission/smtpd[7126]: 803AB41C0A: client=domainname.com[xxx.xxx.xxx.xxx], sasl_method=LOGIN, sasl_username=raitis
Sep 19 19:11:04 ubuntu postfix/cleanup[7131]: 803AB41C0A: message-id=<[email protected]>
Sep 19 19:11:04 ubuntu postfix/qmgr[7010]: 803AB41C0A: from=<[email protected]>, size=694, nrcpt=1 (queue active)
Sep 19 19:11:04 ubuntu postfix/submission/smtpd[7126]: disconnect from domainname.com[xxx.xxx.xxx.xxx] ehlo=2 starttls=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=8
Sep 19 19:11:04 ubuntu postfix/smtp[7133]: Trusted TLS connection established to gmail-smtp-in.l.google.com[66.102.1.26]:25: TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)
Sep 19 19:11:04 ubuntu postfix/smtp[7133]: 803AB41C0A: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[66.102.1.26]:25, delay=0.43, delays=0.06/0.04/0.2/0.14, dsn=2.0.0, status=sent (250 2.0.0 OK 1474305064 14si1756669wmn.119 - gsmtp)
Sep 19 19:11:04 ubuntu postfix/qmgr[7010]: 803AB41C0A: removed

maître.cf

smtp        inet  n       -       -       -       -       smtpd
smtpd       pass  n       -       -       -       -       smtpd
submission  inet  n       -       -       -       -       smtpd
  -o syslog_name=postfix/submission
  -o smtpd_tls_security_level=may
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_sasl_security_options=noanonymous
  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
  -o milter_macro_daemon_name=ORIGINATING
  -o smtp_tls_mandatory_protocols=TLSv1

#628        inet  n       -       y       -       -       qmqpd
pickup      unix  n       -       y       60      1       pickup
cleanup     unix  n       -       y       -       0       cleanup
qmgr        unix  n       -       n       300     1       qmgr
#qmgr       unix  n       -       n       300     1       oqmgr
tlsmgr      unix  -       -       y       1000?   1       tlsmgr
rewrite     unix  -       -       y       -       -       trivial-rewrite
bounce      unix  -       -       y       -       0       bounce
defer       unix  -       -       y       -       0       bounce
trace       unix  -       -       y       -       0       bounce
verify      unix  -       -       y       -       1       verify
flush       unix  n       -       y       1000?   0       flush
proxymap    unix  -       -       n       -       -       proxymap
proxywrite  unix -       -       n       -       1       proxymap
smtp        unix  -       -       y       -       -       smtp
relay       unix  -       -       y       -       -       smtp
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq       unix  n       -       y       -       -       showq
error       unix  -       -       y       -       -       error
retry       unix  -       -       y       -       -       error
discard     unix  -       -       y       -       -       discard
local       unix  -       n       n       -       -       local
virtual     unix  -       n       n       -       -       virtual
lmtp        unix  -       -       y       -       -       lmtp
anvil       unix  -       -       y       -       1       anvil
scache      unix  -       -       y       -       1       scache
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent.  See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#
maildrop  unix  -       n       n       -       -       pipe
  flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
#
# ====================================================================
#
# Recent Cyrus versions can use the existing "lmtp" master.cf entry.
#
# Specify in cyrus.conf:
#   lmtp    cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4
#
# Specify in main.cf one or more of the following:
#  mailbox_transport = lmtp:inet:localhost
#  virtual_transport = lmtp:inet:localhost
#
# ====================================================================
#
# Cyrus 2.1.5 (Amos Gouaux)
# Also specify in main.cf: cyrus_destination_recipient_limit=1
#
#cyrus     unix  -       n       n       -       -       pipe
#  user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
#
# ====================================================================
# Old example of delivery via Cyrus.
#
#old-cyrus unix  -       n       n       -       -       pipe
#  flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
#
# ====================================================================
#
# See the Postfix UUCP_README file for configuration details.
#
uucp      unix  -       n       n       -       -       pipe
  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
#
# Other external delivery methods.
#
ifmail    unix  -       n       n       -       -       pipe
  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp     unix  -       n       n       -       -       pipe
  flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix  -   n   n   -   2   pipe
  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman   unix  -       n       n       -       -       pipe
  flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
  ${nexthop} ${user}
postfixstarttls
5
John Steave

La version 1.0 TLS est souvent considérée comme non sécurisée, c'est pourquoi vous êtes invité à éteindre. Il y a deux bugs potentiels qui ont affecté TLS V1.0: Bête et caniche. Les problèmes avec TLS 1.0 ont été découverts un peu plus tard et sont quelque peu différents que SSL V3 (voir cette discussion ) mais ils sont souvent considérés comme les mêmes.

Ce que j'ai fait à ma fin pour faire de la conformité postfix, cependant, empêche toutefois l'utilisation de SSL V2/3 et TLS V1.0 avec ce qui suit dans main.cf:

smtpd_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1
smtp_tls_mandatory_protocols  = !SSLv2,!SSLv3,!TLSv1
smtpd_tls_protocols           = !SSLv2,!SSLv3,!TLSv1
smtp_tls_protocols            = !SSLv2,!SSLv3,!TLSv1

Je n'ai rien changé dans master.cf.

J'ai aussi empêché de base Protocoles de cryptage avec:

smtpd_tls_exclude_ciphers = RC4, aNULL

Conformément au commentaire ci-dessous, la liste complète de l'exclusion doit être mise à jour à une liste plus longue, comme suit:

smtpd_tls_exclude_ciphers = aNULL, LOW, EXP, MEDIUM, ADH, AECDH, MD5,
                            DSS, ECDSA, CAMELLIA128, 3DES, CAMELLIA256,
                            RSA+AES, eNULL

En tant que note latérale, vous devez également forcer une forme de cryptage avec les deux lignes suivantes:

smtpd_tls_security_level = encrypt
smtp_tls_security_level  = encrypt

Cela peut avoir toutes sortes d'effets secondaires, vous pouvez donc vouloir tester de tels changements avant de rendre les modifications permanentes. Par exemple, mailman ne semble pas supporter le cryptage du tout.

5
Alexis Wilke

man 5 postconf:

smtp_tls_mandatory_protocols (default: !SSLv2)
   List of SSL/TLS protocols that the Postfix SMTP client will use with mandatory TLS encryption.  In main.cf the values are separated by whitespace, commas or colons. In the policy table "protocols" attribute (see smtp_tls_policy_maps) the only  valid
   separator is colon. An empty value means allow all protocols. The valid protocol names, (see \fBfBSSL_get_version(3)), are "SSLv2", "SSLv3" and "TLSv1".

   Note: As of OpenSSL 1.0.1 two new protocols are defined, "TLSv1.1" and "TLSv1.2". If an older Postfix version is linked against OpenSSL 1.0.1 or later, these, or any other new protocol versions, are unconditionally enabled.

   With Postfix >= 2.5 the parameter syntax is expanded to support protocol exclusions. One can now explicitly exclude SSLv2 by setting "smtp_tls_mandatory_protocols = !SSLv2". To exclude both SSLv2 and SSLv3 set "smtp_tls_mandatory_protocols = !SSLv2,
   !SSLv3". Listing the protocols to include, rather than protocols to exclude, is supported, but not recommended. The exclusion form more closely matches the behaviour when the OpenSSL library is newer than Postfix.

   Since SSL version 2 has known protocol weaknesses and is now deprecated, the default setting excludes "SSLv2".  This means that by default, SSL version 2 will not be used at the "encrypt" security level and higher.

   See the documentation of the smtp_tls_policy_maps parameter and TLS_README for more information about security levels.

   Example:

   # Preferred form with Postfix >= 2.5:
   smtp_tls_mandatory_protocols = !SSLv2, !SSLv3
   # Alternative form.
   smtp_tls_mandatory_protocols = TLSv1

   This feature is available in Postfix 2.3 and later.
1
rudimeier