F27 Self Contained Change: OpenSSH Server Crypto Policy

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= Proposed Self Contained Change: OpenSSH Server Crypto Policy =
https://fedoraproject.org/wiki/Changes/OpenSSH_Server_Crypto_Policy

Change owner(s):
* Jakub Jelen <jjelen AT redhat DOT com>

OpenSSH clients follow the system-wide crypto policy since Fedora 26.
This F27 change modifies the openssh server configuration to adhere to
the system-wide policy. That will allow openssh server configuration
to adapt to the multiple security levels offered system-wide.


== Detailed Description ==
Currently, the set of cryptographic algorithms used in OpenSSH is
defined by upstream and Fedora just inherits what upstream considers
secure. If there are special requirements for the security, manual
modifications of the configuration files is required, which also
prevents package manager to update the configuration file with future
updates and can possibly leave enabled insecure algorithms.

Since Fedora 26 OpenSSH clients are following crypto policies defined
system-wide using Include configuration option in the main ssh_config.
We can not use the same method in the server, because OpenBSD did not
accept yet the patch supporting the same in the server configuration
(upstream bug) so we will work out other way of doing that without
disrupting existing workflows.

For more information about Crypto Policy, see the appropriate wiki
page Changes/CryptoPolicy describing the concept in whole.


== Scope ==
* Proposal owners:
Create a replace script, that will replace predefined comment in the
configuration with configuration generated according to current crypto
policies. Make systemd trigger this script on restart.

* Other developers:
N/A (not a System Wide Change)

* Release engineering:
https://pagure.io/releng/issue/6915

* List of deliverables:
N/A (not a System Wide Change)

* Policies and guidelines:
N/A (not a System Wide Change)

* Trademark approval:
N/A (not needed for this Change)
-- 
Jan Kuřík
Platform & Fedora Program Manager
Red Hat Czech s.r.o., Purkynova 99/71, 612 45 Brno, Czech Republic
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