/usr/lib/python2.7/dist-packages/fabric/auth.py is in fabric 1.13.1-2.
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  | """
Common authentication subroutines. Primarily for internal use.
"""
def get_password(user, host, port, login_only=False):
    from fabric.state import env
    from fabric.network import join_host_strings
    host_string = join_host_strings(user, host, port)
    sudo_password = env.sudo_passwords.get(host_string, env.sudo_password)
    login_password = env.passwords.get(host_string, env.password)
    return login_password if login_only else sudo_password or login_password
def set_password(user, host, port, password):
    from fabric.state import env
    from fabric.network import join_host_strings
    host_string = join_host_strings(user, host, port)
    env.password = env.passwords[host_string] = password
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