Class: Net::SSH::Verifiers::Always

Inherits:
Object
  • Object
show all
Defined in:
lib/net/ssh/verifiers/always.rb

Overview

Does a strict host verification, looking the server up in the known host files to see if a key has already been seen for this server. If this server does not appear in any host file, an exception will be raised (HostKeyUnknown). This is in contrast to the "Strict" class, which will silently add the key to your known_hosts file. If the server does appear at least once, but the key given does not match any known for the server, an exception will be raised (HostKeyMismatch). Otherwise, this returns true.

Direct Known Subclasses

AcceptNew

Instance Method Summary collapse

Instance Method Details

#verify(arguments) ⇒ Object 



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# File 'lib/net/ssh/verifiers/always.rb', line 16

def verify(arguments)
  host_keys = arguments[:session].host_keys

  # We've never seen this host before, so raise an exception.
  process_cache_miss(host_keys, arguments, HostKeyUnknown, "is unknown") if host_keys.empty?

  # Find the known-hosts entry whose key matches the presented certificate.
  found_key = host_keys.find do |key|
    if key.respond_to?(:matches_key?)
      key.matches_key?(arguments[:key])
    else
      key.ssh_type == arguments[:key].ssh_type && key.to_blob == arguments[:key].to_blob
    end
  end

  # No matching entry found — key is not recognized.
  process_cache_miss(host_keys, arguments, HostKeyMismatch, "does not match") unless found_key

  # For @cert-authority entries, enforce the certificate constraints
  # OpenSSH checks in sshkey_cert_check_authority. A certificate signed by
  # the trusted CA but failing any of these is rejected with
  # HostKeyMismatch (not HostKeyUnknown) so AcceptNew does not swallow the
  # failure and remember the rejected certificate.
  verify_certificate!(found_key, host_keys, arguments)

  true
end

#verify_signature(&block) ⇒ Object 



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# File 'lib/net/ssh/verifiers/always.rb', line 44

def verify_signature(&block)
  yield
end