/usr/lib/ruby/vendor_ruby/net/ssh/ is in ruby-net-ssh 1:2.2.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/agent.rb
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/constants.rb
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/key_manager.rb
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/methods/
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/methods/abstract.rb
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/methods/hostbased.rb
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/methods/keyboard_interactive.rb
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/methods/password.rb
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/methods/publickey.rb
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/pageant.rb
/usr/lib/ruby/vendor_ruby/net/ssh/authentication/session.rb
/usr/lib/ruby/vendor_ruby/net/ssh/buffer.rb
/usr/lib/ruby/vendor_ruby/net/ssh/buffered_io.rb
/usr/lib/ruby/vendor_ruby/net/ssh/config.rb
/usr/lib/ruby/vendor_ruby/net/ssh/connection/
/usr/lib/ruby/vendor_ruby/net/ssh/connection/channel.rb
/usr/lib/ruby/vendor_ruby/net/ssh/connection/constants.rb
/usr/lib/ruby/vendor_ruby/net/ssh/connection/session.rb
/usr/lib/ruby/vendor_ruby/net/ssh/connection/term.rb
/usr/lib/ruby/vendor_ruby/net/ssh/errors.rb
/usr/lib/ruby/vendor_ruby/net/ssh/key_factory.rb
/usr/lib/ruby/vendor_ruby/net/ssh/known_hosts.rb
/usr/lib/ruby/vendor_ruby/net/ssh/loggable.rb
/usr/lib/ruby/vendor_ruby/net/ssh/packet.rb
/usr/lib/ruby/vendor_ruby/net/ssh/prompt.rb
/usr/lib/ruby/vendor_ruby/net/ssh/proxy/
/usr/lib/ruby/vendor_ruby/net/ssh/proxy/command.rb
/usr/lib/ruby/vendor_ruby/net/ssh/proxy/errors.rb
/usr/lib/ruby/vendor_ruby/net/ssh/proxy/http.rb
/usr/lib/ruby/vendor_ruby/net/ssh/proxy/socks4.rb
/usr/lib/ruby/vendor_ruby/net/ssh/proxy/socks5.rb
/usr/lib/ruby/vendor_ruby/net/ssh/ruby_compat.rb
/usr/lib/ruby/vendor_ruby/net/ssh/service/
/usr/lib/ruby/vendor_ruby/net/ssh/service/forward.rb
/usr/lib/ruby/vendor_ruby/net/ssh/test/
/usr/lib/ruby/vendor_ruby/net/ssh/test.rb
/usr/lib/ruby/vendor_ruby/net/ssh/test/channel.rb
/usr/lib/ruby/vendor_ruby/net/ssh/test/extensions.rb
/usr/lib/ruby/vendor_ruby/net/ssh/test/kex.rb
/usr/lib/ruby/vendor_ruby/net/ssh/test/local_packet.rb
/usr/lib/ruby/vendor_ruby/net/ssh/test/packet.rb
/usr/lib/ruby/vendor_ruby/net/ssh/test/remote_packet.rb
/usr/lib/ruby/vendor_ruby/net/ssh/test/script.rb
/usr/lib/ruby/vendor_ruby/net/ssh/test/socket.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/
/usr/lib/ruby/vendor_ruby/net/ssh/transport/algorithms.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/cipher_factory.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/constants.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/abstract.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/md5.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/md5_96.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/none.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/sha1.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/hmac/sha1_96.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/identity_cipher.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/kex/
/usr/lib/ruby/vendor_ruby/net/ssh/transport/kex.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/kex/diffie_hellman_group1_sha1.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/kex/diffie_hellman_group_exchange_sha1.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/openssl.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/packet_stream.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/server_version.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/session.rb
/usr/lib/ruby/vendor_ruby/net/ssh/transport/state.rb
/usr/lib/ruby/vendor_ruby/net/ssh/verifiers/
/usr/lib/ruby/vendor_ruby/net/ssh/verifiers/lenient.rb
/usr/lib/ruby/vendor_ruby/net/ssh/verifiers/null.rb
/usr/lib/ruby/vendor_ruby/net/ssh/verifiers/strict.rb
/usr/lib/ruby/vendor_ruby/net/ssh/version.rb