[Bug 1972939] Re: Jammy tinc incompatibile with older (e.g. Xenial) tinc nodes

[Nathan Stratton Treadway]

On Wed, May 18, 2022 at 13:41:06 -0000, Simon Chopin wrote:
> Also, does tinc work in a purely Jammy context? :-)

As far as I can determine the issue relates to compatibility between
libssl3 and the algorithms used by the Xenial-era tinc, and thus I can't
imagine Jammy-to-Jammy would be a problem....

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Title:
  Jammy tinc  incompatibile with older (e.g. Xenial) tinc nodes

Status in Release Notes for Ubuntu:
  New
Status in openssl package in Ubuntu:
  New
Status in tinc package in Ubuntu:
  New

Bug description:
  The tinc included in Jammy (1.0.36-2build1 linked with libssl3) cannot
  connect to tinc nodes running e.g. tinc from Xenial (1.0.26-1).

  (Tinc from Impish, which is also v1.0.36-2 but is linked to libssl1.1,
  can connect to these nodes without problems.)

  The symptom is a log message (on the system running Jammy) during the
  metadata channel negotiation (with debug level set to 5):

  Error during initialisation of cipher from tinc_xenial [...]
  error:0308010C:digital envelope routines::unsupported

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