Prior to this commit, the ssh communicator would use the default cipher
list in Net::SSH to negociate which ciphers it should use between hosts.
Due to a bug in Net::SSH and the position of the `none` cipher in its
default cipher list, if a host supported the none cipher, but also
only supported other ciphers that came after none in the default list,
it would accept none and attempt to use that cipher instead of the other
supported ciphers. This commit fixes that behavior by copying the
default cipher list from Net::SSH and placing none last in the list so
that other ciphers can be used in the negotiation before attempting to
use the unsecure none cipher.
In some cases the SSH connection may be aborted while waiting
for setup. This includes aborted connections in the list of
applicable exceptions to retry on while waiting for the connection
to become available.
Fixes#8520
Prevent sending empty data strings to defined blocks handling
stderr and stdout output. These can occur when the garbage
marker is identified and collected data pruned, but no remaining
data is left to send.
Fixes#8259
This adds two new SSH configuration options:
- `keys_only`
- `paranoid`
These values were previously hard-coded, but can now be user-specified.
Fixes GH-4275
This changes the ssh ready? method to treat ENETUNREACH the same way as
EHOSTUNREACH errors.
When attempting to SSH into a box, it tries up to 5 times to connect to
the box, ignoring various errors. Later it will catch and gracefully
handle most of those errors so that callers don't have to know the
details.
However, the Errno::ENETUNREACH error is not caught, which means that
callers that expect a clean boolean return from ready? don't get that,
and instead get an exception they probably aren't expecting.
In the situation where the SSH key has invalid permissions/owner, the reconnect-loop keeps failing repeatedly yet stays silent about the reasons. A message must be reported from the default exception handler (added). In addition, the situations where the SSH key owner or permissions are wrong must lead to a proper failure (added). Ideally, though, the owner/permissions check must happen before launching the VM, hence this is not a perfect fix.
With this change, any caller of machine.ssh_info is assured that best
efforts will be done to fix possible wrong permissions on the private
key files.
Fix#4652
Brian Cain
Chris Roberts
Zack Train
Seth Vargo
Eli Skeggs
Mitchell Hashimoto
Clayton O'Neill
Aaron Quint
Mitchell Hashimoto
Konstantin Tretyakov
Gilles Cornu
Nicolas Philippe
Leo Simons
jdmulloy
Kalman Hazins
Hiroshi Miura
krazyLee
Justin Campbell