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Description of problem:

Dovecot 2.0.9 does not support the ssl_dh_parameters_length configuration option which is available in Dovecot version 2.2. This option is used to set the DH parameters length to something greater than the default 512/1024bit.

Please backport this feature to allow a custom (larger) DH parameters length to be used.

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

dovecot-2.0.9-8.el6_6.4

How reproducible:

Add ssl_dh_parameters_length = 2048 option to Dovecot configuration

Steps to Reproduce:
1.
2.
3.

Actual results:

Dovecot fails with:

Unknown setting: ssl_dh_parameters_length

Expected results:

ssl_dh_parameters_length is set

Additional info:

http://wiki2.dovecot.org/SSL/DovecotConfiguration

This needs to be back ported for RHEL 5.x too. Seems to be required due to the logjam ssl exploit. (actually, given how old the dovecot version is on RHEL 5, may be easier to just change the hard-coded DH parameter from 1024 to 2048?)

Created attachment 1111524 [details]
patch to fix this

1) Reproducer
# echo 'ssl_dh_parameters_length = 2048' >> /etc/dovecot/dovecot.conf
# doveconf -n

2) Outputs
a) Old package
# doveconf -n | grep 'ssl_dh_parameters_length'
doveconf: Fatal: Error in configuration file /etc/dovecot/dovecot.conf line 83: Unknown setting: ssl_dh_parameters_length

b) New package
# doveconf -n | grep 'ssl_dh_parameters_length'
ssl_dh_parameters_length = 2048

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-0929.html