Bug 1475372 - postfix should default to using starttls when sending if capability is offered
postfix should default to using starttls when sending if capability is offered
Status: NEW
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: postfix (Show other bugs)
7.3
Unspecified Unspecified
unspecified Severity unspecified
: rc
: ---
Assigned To: Jaroslav Škarvada
qe-baseos-daemons
:
Depends On:
Blocks:
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Reported: 2017-07-26 10:02 EDT by Martin Poole
Modified: 2018-02-19 04:11 EST (History)
1 user (show)

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Description Martin Poole 2017-07-26 10:02:44 EDT
Description of problem:

postfix should default to using starttls when sending if capability is offered

Current default configuration does even attempt starttls even if the server offers it.

Version-Release number of selected component (if applicable):

postfix-2.10.1-6.el7.x86_64


Additional info:

Would propose we adopt the recommended client setting portion of 

    Securing postfix on RHEL7 
    https://access.redhat.com/articles/1468593


First cut for client-side appears to be

smtp_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
smtp_tls_mandatory_protocols = !SSLv2, !SSLv3
smtp_tls_protocols = !SSLv2, !SSLv3
smtp_tls_exclude_ciphers = EXP, MEDIUM, LOW, DES, 3DES, SSLv2
smtp_tls_ciphers = high

tls_high_cipherlist = kEECDH:+kEECDH+SHA:kEDH:+kEDH+SHA:+kEDH+CAMELLIA:kECDH:+kECDH+SHA:kRSA:+kRSA+SHA:+kRSA+CAMELLIA:!aNULL:!eNULL:!SSLv2:!RC4:!MD5:!DES:!EXP:!SEED:!IDEA:!3DES

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