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#
# A wrapper around OpenSSL::PKey::RSA instances to provide a better api for dealing with SSH keys.
#
# cipher 'ssh-ed25519' not supported yet because we are waiting for support in Net::SSH
#
require 'net/ssh'
require 'forwardable'
module LeapCli
class SshKey
extend Forwardable
attr_accessor :filename
attr_accessor :comment
# supported ssh key types, in order of preference
SUPPORTED_TYPES = ['ssh-rsa', 'ecdsa-sha2-nistp256']
SUPPORTED_TYPES_RE = /(#{SUPPORTED_TYPES.join('|')})/
##
## CLASS METHODS
##
def self.load(arg1, arg2=nil)
key = nil
if arg1.is_a? OpenSSL::PKey::RSA
key = SshKey.new arg1
elsif arg1.is_a? String
if arg1 =~ /^ssh-/
type, data = arg1.split(' ')
key = SshKey.new load_from_data(data, type)
elsif File.exists? arg1
key = SshKey.new load_from_file(arg1)
key.filename = arg1
else
key = SshKey.new load_from_data(arg1, arg2)
end
end
return key
rescue StandardError => exc
end
def self.load_from_file(filename)
public_key = nil
private_key = nil
begin
public_key = Net::SSH::KeyFactory.load_public_key(filename)
rescue NotImplementedError, Net::SSH::Exception, OpenSSL::PKey::PKeyError
begin
private_key = Net::SSH::KeyFactory.load_private_key(filename)
rescue NotImplementedError, Net::SSH::Exception, OpenSSL::PKey::PKeyError
end
end
public_key || private_key
end
def self.load_from_data(data, type='ssh-rsa')
public_key = nil
private_key = nil
begin
public_key = Net::SSH::KeyFactory.load_data_public_key("#{type} #{data}")
rescue NotImplementedError, Net::SSH::Exception, OpenSSL::PKey::PKeyError
begin
private_key = Net::SSH::KeyFactory.load_data_private_key("#{type} #{data}")
rescue NotImplementedError, Net::SSH::Exception, OpenSSL::PKey::PKeyError
end
end
public_key || private_key
end
#
# Picks one key out of an array of keys that we think is the "best",
# based on the order of preference in SUPPORTED_TYPES
#
# Currently, this does not take bitsize into account.
#
def self.pick_best_key(keys)
keys.select {|k|
SUPPORTED_TYPES.include?(k.type)
}.sort {|a,b|
SUPPORTED_TYPES.index(a.type) <=> SUPPORTED_TYPES.index(b.type)
}.first
end
#
# takes a string with one or more ssh keys, one key per line,
# and returns an array of SshKey objects.
#
# the lines should be in one of these formats:
#
# 1. <hostname> <key-type> <key>
# 2. <key-type> <key>
#
def self.parse_keys(string)
keys = []
lines = string.split("\n").grep(/^[^#]/)
lines.each do |line|
if line =~ / #{SshKey::SUPPORTED_TYPES_RE} /
# <hostname> <key-type> <key>
keys << line.split(' ')[1..2]
elsif line =~ /^#{SshKey::SUPPORTED_TYPES_RE} /
# <key-type> <key>
keys << line.split(' ')
end
end
return keys.map{|k| SshKey.load(k[1], k[0])}
end
#
# takes a string with one or more ssh keys, one key per line,
# and returns a string that specified the ssh key algorithms
# that are supported by the keys, in order of preference.
#
# eg: ecdsa-sha2-nistp256,ssh-rsa,ssh-ed25519
#
def self.supported_host_key_algorithms(string)
if string
self.parse_keys(string).map {|key|
key.type
}.join(',')
else
""
end
end
##
## INSTANCE METHODS
##
public
def initialize(rsa_key)
@key = rsa_key
end
def_delegator :@key, :fingerprint, :fingerprint
def_delegator :@key, :public?, :public?
def_delegator :@key, :private?, :private?
def_delegator :@key, :ssh_type, :type
def_delegator :@key, :public_encrypt, :public_encrypt
def_delegator :@key, :public_decrypt, :public_decrypt
def_delegator :@key, :private_encrypt, :private_encrypt
def_delegator :@key, :private_decrypt, :private_decrypt
def_delegator :@key, :params, :params
def_delegator :@key, :to_text, :to_text
def public_key
SshKey.new(@key.public_key)
end
def private_key
SshKey.new(@key.private_key)
end
#
# not sure if this will always work, but is seems to for now.
#
def bits
Net::SSH::Buffer.from(:key, @key).to_s.split("\001\000").last.size * 8
end
def summary
#"%s %s %s (%s)" % [self.type, self.bits, self.fingerprint, self.filename || self.comment || '']
"%s %s %s" % [self.type, self.bits, self.fingerprint]
end
def to_s
self.type + " " + self.key
end
def key
[Net::SSH::Buffer.from(:key, @key).to_s].pack("m*").gsub(/\s/, "")
end
def ==(other_key)
return false if other_key.nil?
return false if self.class != other_key.class
return self.to_text == other_key.to_text
end
def in_known_hosts?(*identifiers)
identifiers.each do |identifier|
Net::SSH::KnownHosts.search_for(identifier).each do |key|
return true if self == key
end
end
return false
end
end
end
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