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from __future__ import division
from collections import OrderedDict
import click
from srptools import VERSION, SRPContext, SRPServerSession, SRPClientSession, hex_from_b64
from srptools.constants import *
PRESETS = OrderedDict([
('1024', (PRIME_1024, PRIME_1024_GEN)),
('1536', (PRIME_1536, PRIME_1536_GEN)),
('2048', (PRIME_2048, PRIME_2048_GEN)),
('3072', (PRIME_3072, PRIME_3072_GEN)),
('4096', (PRIME_4096, PRIME_4096_GEN)),
('6144', (PRIME_6144, PRIME_6144_GEN)),
])
@click.group()
@click.version_option(version='.'.join(map(str, VERSION)))
def base():
"""srptools command line utility.
Tools to implement Secure Remote Password (SRP) authentication.
Basic scenario:
> srptools get_user_data_triplet
> srptools server get_private_and_public
> srptools client get_private_and_public
> srptools client get_session_data
> srptools server get_session_data
"""
def common_options(func):
"""Commonly used command options."""
def parse_preset(ctx, param, value):
return PRESETS.get(value, (None, None))
def parse_private(ctx, param, value):
return hex_from_b64(value) if value else None
func = click.option('--private', default=None, help='Private.', callback=parse_private)(func)
func = click.option(
'--preset',
default=None, help='Preset ID defining prime and generator pair.',
type=click.Choice(PRESETS.keys()), callback=parse_preset
)(func)
return func
@base.group()
def server():
"""Server session related commands."""
@base.group()
def client():
"""Client session related commands."""
@server.command()
@click.argument('username')
@click.argument('password_verifier')
@common_options
def get_private_and_public(username, password_verifier, private, preset):
"""Print out server public and private."""
session = SRPServerSession(
SRPContext(username, prime=preset[0], generator=preset[1]),
hex_from_b64(password_verifier), private=private)
click.secho('Server private: %s' % session.private_b64)
click.secho('Server public: %s' % session.public_b64)
@server.command()
@click.argument('username')
@click.argument('password_verifier')
@click.argument('salt')
@click.argument('client_public')
@common_options
def get_session_data( username, password_verifier, salt, client_public, private, preset):
"""Print out server session data."""
session = SRPServerSession(
SRPContext(username, prime=preset[0], generator=preset[1]),
hex_from_b64(password_verifier), private=private)
session.process(client_public, salt, base64=True)
click.secho('Server session key: %s' % session.key_b64)
click.secho('Server session key proof: %s' % session.key_proof_b64)
click.secho('Server session key hash: %s' % session.key_proof_hash_b64)
@client.command()
@click.argument('username')
@click.argument('password')
@common_options
def get_private_and_public(ctx, username, password, private, preset):
"""Print out server public and private."""
session = SRPClientSession(
SRPContext(username, password, prime=preset[0], generator=preset[1]),
private=private)
click.secho('Client private: %s' % session.private_b64)
click.secho('Client public: %s' % session.public_b64)
@client.command()
@click.argument('username')
@click.argument('password')
@click.argument('salt')
@click.argument('server_public')
@common_options
def get_session_data(ctx, username, password, salt, server_public, private, preset):
"""Print out client session data."""
session = SRPClientSession(
SRPContext(username, password, prime=preset[0], generator=preset[1]),
private=private)
session.process(server_public, salt, base64=True)
click.secho('Client session key: %s' % session.key_b64)
click.secho('Client session key proof: %s' % session.key_proof_b64)
click.secho('Client session key hash: %s' % session.key_proof_hash_b64)
@base.command()
@click.argument('username')
@click.argument('password')
def get_user_data_triplet(username, password):
"""Print out user data triplet: username, password verifier, salt."""
context = SRPContext(username, password)
username, password_verifier, salt = context.get_user_data_triplet(base64=True)
click.secho('Username: %s' % username)
click.secho('Password verifier: %s' % password_verifier)
click.secho('Salt: %s' % salt)
def main():
"""
CLI entry point
"""
base(obj={})
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