This is only setting something that is default anyways and
prevents sshd from starting if one of the listed methods
is not activated.
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
In order to harden OpenSSH server in IPFire, using the upstream default configuration
and edit it via sed commands in LFS file is error-prone and does not scale.
Thereof we ship a custom and more secure OpenSSH server configuration which
is copied into the image during build time.
The fourth version of this patch disables password authentication by
default, since this is required by some cloud hosters in order to apply
the image. Further, this method is less secure than pubkey
authentication.
Non-AEAD ciphers have been re-added to provide compatibility to older
RHEL systems.
Fixes#11750Fixes#11751
Partially fixes#11538
Signed-off-by: Peter Müller <peter.mueller@link38.eu>
Cc: Marcel Lorenz <marcel.lorenz@ipfire.org>
Cc: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Introduce a custom OpenSSH client configuration file for IPFire.
Some people use it as a jumping host, so applying hardening options
system-wide improves security.
Cryptography setup is the same as for OpenSSH server configuration.
The second version of this patch re-adds some non-AEAD cipher suites
which are needed for connecting to older RHEL systems.
Partially fixes#11751
Signed-off-by: Peter Müller <peter.mueller@link38.eu>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Attempt to detect DNS spoofing attacks by inserting 0x20-encoded
random bits into upstream queries. Upstream documentation claims
it to be an experimental implementation, it did not cause any trouble
on productive systems here.
See https://nlnetlabs.nl/documentation/unbound/unbound.conf/ for
further details.
Signed-off-by: Peter Müller <peter.mueller@link38.eu>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
By default, Unbound neither keeps track of the number of unwanted
replies nor initiates countermeasures if they become too large (DNS
cache poisoning).
This sets the maximum number of tolerated unwanted replies to
1M, causing the cache to be flushed afterwards. (Upstream documentation
recommends 10M as a threshold, but this turned out to be ineffective
against attacks in the wild.)
See https://nlnetlabs.nl/documentation/unbound/unbound.conf/ for
details. This version of the patch uses 1M as threshold instead of
5M and supersedes the first and second version.
Signed-off-by: Peter Müller <peter.mueller@link38.eu>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
This is done at boot time and doesn't normally need to be done again.
On AWS or in the setup, renaming any network interfaces is being
handled automatically.
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
xtables are build for installed iptables version so we need
to ship it even if it was not updated.
Also clean /lib/xtables because some modules are renamed.
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
The third version of this patch superseds the first and
second one which were broken due to bugs in the MUAs GPG
implementation.
Signed-off-by: Peter Müller <peter.mueller@link38.eu>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
