touch-packages team mailing list archive

[Colin Watson <cjwatson@xxxxxxxxxxxxx>]

Backporting algorithm tightening may make sense, but I don't want to end
up in a situation where users are trying to deal with interoperability
issues but none of the upstream docs make sense.  If we're advocating
specific changes that upstream aren't currently already considering, we
should take that up with upstream.

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https://bugs.launchpad.net/bugs/1499392

Title:
  OpenSSH Security and SHA1

Status in openssh package in Ubuntu:
  Confirmed

Bug description:
  We should enhance Security by disabling SHA1 or, if not possible
  (older Clients) by changing the KexAlgorithms, Ciphers and MACs order.

  For e.g. by :

  1. If we add Support for older Clients we should change this:

  #### OpenSSH Security ####

  KexAlgorithms curve25519-sha256@xxxxxxxxxx,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1
  Ciphers chacha20-poly1305@xxxxxxxxxxx,aes256-gcm@xxxxxxxxxxx,aes128-gcm@xxxxxxxxxxx,aes256-ctr,aes192-ctr,aes128-ctr
  MACs hmac-sha2-512-etm@xxxxxxxxxxx,hmac-sha2-256-etm@xxxxxxxxxxx,hmac-ripemd160-etm@xxxxxxxxxxx,umac-128-etm@xxxxxxxxxxx,hmac-sha2-512,hmac-sha2-256,hmac-ripemd160,umac-128@xxxxxxxxxxx

  2.  If we just Support new Clients we should change this :

  [...]
  HostKey /etc/ssh/ssh_host_rsa_key
  HostKey /etc/ssh/ssh_host_ed25519_key
  [...]

  #### OpenSSH Security ####

  KexAlgorithms curve25519-sha256@xxxxxxxxxx,diffie-hellman-group-exchange-sha256
  Ciphers chacha20-poly1305@xxxxxxxxxxx,aes256-gcm@xxxxxxxxxxx,aes128-gcm@xxxxxxxxxxx,aes256-ctr,aes192-ctr,aes128-ctr
  MACs hmac-sha2-512-etm@xxxxxxxxxxx,hmac-sha2-256-etm@xxxxxxxxxxx,hmac-ripemd160-etm@xxxxxxxxxxx,umac-128-etm@xxxxxxxxxxx,hmac-sha2-512,hmac-sha2-256,hmac-ripemd160,umac-128@xxxxxxxxxxx

  For more Information about my report go here:

  https://github.com/scaleway/image-ubuntu/pull/35

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