Class: Net::SSH::Verifiers::Secure

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

Strict

Instance Method Summary collapse

Instance Method Details

#verify(arguments) ⇒ Object


15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
# File 'lib/net/ssh/verifiers/secure.rb', line 15

def verify(arguments)
  options = arguments[:session].options
  host = options[:host_key_alias] || arguments[:session].host_as_string
  matches = Net::SSH::KnownHosts.search_for(host, arguments[:session].options)

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

  # If we found any matches, check to see that the key type and
  # blob also match.
  found = matches.any? do |key|
    key.ssh_type == arguments[:key].ssh_type &&
    key.to_blob  == arguments[:key].to_blob
  end

  # If a match was found, return true. Otherwise, raise an exception
  # indicating that the key was not recognized.
  unless found
    process_cache_miss(host, arguments, HostKeyMismatch, "does not match")
  end

  found
end