/usr/lib/ruby/vendor_ruby/net/ssh/config.rb is in ruby-net-ssh 1:2.5.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 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 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 | module Net; module SSH
# The Net::SSH::Config class is used to parse OpenSSH configuration files,
# and translates that syntax into the configuration syntax that Net::SSH
# understands. This lets Net::SSH scripts read their configuration (to
# some extent) from OpenSSH configuration files (~/.ssh/config, /etc/ssh_config,
# and so forth).
#
# Only a subset of OpenSSH configuration options are understood:
#
# * Ciphers => maps to the :encryption option
# * Compression => :compression
# * CompressionLevel => :compression_level
# * ConnectTimeout => maps to the :timeout option
# * ForwardAgent => :forward_agent
# * GlobalKnownHostsFile => :global_known_hosts_file
# * HostBasedAuthentication => maps to the :auth_methods option
# * HostKeyAlgorithms => maps to :host_key option
# * HostKeyAlias => :host_key_alias
# * HostName => :host_name
# * IdentityFile => maps to the :keys option
# * IdentitiesOnly => :keys_only
# * Macs => maps to the :hmac option
# * PasswordAuthentication => maps to the :auth_methods option
# * Port => :port
# * PreferredAuthentications => maps to the :auth_methods option
# * ProxyCommand => maps to the :proxy option
# * RekeyLimit => :rekey_limit
# * User => :user
# * UserKnownHostsFile => :user_known_hosts_file
#
# Note that you will never need to use this class directly--you can control
# whether the OpenSSH configuration files are read by passing the :config
# option to Net::SSH.start. (They are, by default.)
class Config
class << self
@@default_files = %w(~/.ssh/config /etc/ssh_config /etc/ssh/ssh_config)
# Returns an array of locations of OpenSSH configuration files
# to parse by default.
def default_files
@@default_files
end
# Loads the configuration data for the given +host+ from all of the
# given +files+ (defaulting to the list of files returned by
# #default_files), translates the resulting hash into the options
# recognized by Net::SSH, and returns them.
def for(host, files=default_files)
translate(files.inject({}) { |settings, file| load(file, host, settings) })
end
# Load the OpenSSH configuration settings in the given +file+ for the
# given +host+. If +settings+ is given, the options are merged into
# that hash, with existing values taking precedence over newly parsed
# ones. Returns a hash containing the OpenSSH options. (See
# #translate for how to convert the OpenSSH options into Net::SSH
# options.)
def load(path, host, settings={})
file = File.expand_path(path)
return settings unless File.readable?(file)
globals = {}
matched_host = nil
multi_host = []
seen_host = false
IO.foreach(file) do |line|
next if line =~ /^\s*(?:#.*)?$/
if line =~ /^\s*(\S+)\s*=(.*)$/
key, value = $1, $2
else
key, value = line.strip.split(/\s+/, 2)
end
# silently ignore malformed entries
next if value.nil?
key.downcase!
value = $1 if value =~ /^"(.*)"$/
value = case value.strip
when /^\d+$/ then value.to_i
when /^no$/i then false
when /^yes$/i then true
else value
end
if key == 'host'
# Support "Host host1 host2 hostN".
# See http://github.com/net-ssh/net-ssh/issues#issue/6
multi_host = value.to_s.split(/\s+/)
matched_host = multi_host.select { |h| host =~ pattern2regex(h) }.first
seen_host = true
elsif !seen_host
if key == 'identityfile'
(globals[key] ||= []) << value
else
globals[key] = value unless settings.key?(key)
end
elsif !matched_host.nil?
if key == 'identityfile'
(settings[key] ||= []) << value
else
settings[key] = value unless settings.key?(key)
end
end
end
settings = globals.merge(settings) if globals
return settings
end
# Given a hash of OpenSSH configuration options, converts them into
# a hash of Net::SSH options. Unrecognized options are ignored. The
# +settings+ hash must have Strings for keys, all downcased, and
# the returned hash will have Symbols for keys.
def translate(settings)
settings.inject({}) do |hash, (key, value)|
case key
when 'bindaddress' then
hash[:bind_address] = value
when 'ciphers' then
hash[:encryption] = value.split(/,/)
when 'compression' then
hash[:compression] = value
when 'compressionlevel' then
hash[:compression_level] = value
when 'connecttimeout' then
hash[:timeout] = value
when 'forwardagent' then
hash[:forward_agent] = value
when 'identitiesonly' then
hash[:keys_only] = value
when 'globalknownhostsfile'
hash[:global_known_hosts_file] = value
when 'hostbasedauthentication' then
if value
hash[:auth_methods] ||= []
hash[:auth_methods] << "hostbased"
end
when 'hostkeyalgorithms' then
hash[:host_key] = value.split(/,/)
when 'hostkeyalias' then
hash[:host_key_alias] = value
when 'hostname' then
hash[:host_name] = value
when 'identityfile' then
hash[:keys] = value
when 'macs' then
hash[:hmac] = value.split(/,/)
when 'passwordauthentication'
if value
hash[:auth_methods] ||= []
hash[:auth_methods] << "password"
end
when 'port'
hash[:port] = value
when 'preferredauthentications'
hash[:auth_methods] = value.split(/,/)
when 'proxycommand'
if value and !(value =~ /^none$/)
require 'net/ssh/proxy/command'
hash[:proxy] = Net::SSH::Proxy::Command.new(value)
end
when 'pubkeyauthentication'
if value
hash[:auth_methods] ||= []
hash[:auth_methods] << "publickey"
end
when 'rekeylimit'
hash[:rekey_limit] = interpret_size(value)
when 'user'
hash[:user] = value
when 'userknownhostsfile'
hash[:user_known_hosts_file] = value
end
hash
end
end
private
# Converts an ssh_config pattern into a regex for matching against
# host names.
def pattern2regex(pattern)
pattern = "^" + pattern.to_s.gsub(/\./, "\\.").
gsub(/\?/, '.').
gsub(/([+\/])/, '\\\\\\0').
gsub(/\*/, '.*') + "$"
Regexp.new(pattern, true)
end
# Converts the given size into an integer number of bytes.
def interpret_size(size)
case size
when /k$/i then size.to_i * 1024
when /m$/i then size.to_i * 1024 * 1024
when /g$/i then size.to_i * 1024 * 1024 * 1024
else size.to_i
end
end
end
end
end; end
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