/usr/lib/python3/dist-packages/cryptography/hazmat/backends/ is in python3-cryptography 2.1.4-1ubuntu1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/__init__.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/interfaces.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/__init__.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/aead.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/backend.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/ciphers.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/cmac.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/decode_asn1.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/dh.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/dsa.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/ec.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/encode_asn1.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/hashes.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/hmac.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/rsa.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/utils.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/x25519.py
/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/x509.py