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dagad.py
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dagad.py
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#!/usr/bin/env python3
"""DAGA Server"""
import argparse
import json
import ssl
import sys
import uuid
import requests
from bottle import request, route, run
import daga
class GlobalState:
def __init__(self, contexts):
self.contexts = contexts
self.active_auths = {}
self.bindings = {}
def _internal_begin_challenge_generation(d):
state.active_auths[d["auth_id"]] = d["client_data"]
ac, server = state.contexts[d["client_data"]["uuid"]]
part = daga.Rand.randrange(daga.Q)
return {
"n" : part,
"sig" : daga.dsa_sign(server.private_key, part),
}
@route("/internal/begin_challenge_generation", method="POST")
def internal_begin_challenge_generation():
return _internal_begin_challenge_generation(request.json)
def _internal_finish_challenge_generation(d):
ac, server = state.contexts[state.active_auths[d["auth_id"]]["uuid"]]
challenge = 0
for pub, (part, sig) in zip(ac.server_keys, d["parts"]):
daga.dsa_verify(pub, part, sig)
challenge += part
challenge %= daga.Q
state.active_auths[d["auth_id"]]["challenge"] = challenge
return {
"challenge" : challenge,
"sig" : daga.dsa_sign(server.private_key, challenge),
}
@route("/internal/finish_challenge_generation", method="POST")
def internal_finish_challenge_generation():
return _internal_finish_challenge_generation(request.json)
def _internal_check_challenge_response(d):
auth_ctx = state.active_auths[d["auth_id"]]
ac, server = state.contexts[auth_ctx["uuid"]]
client_proof = daga.ClientProof(d["C"], d["R"])
auth_ctx["C"] = d["C"]
auth_ctx["R"] = d["R"]
msg_chain = daga.VerificationChain(daga.Challenge(auth_ctx["challenge"], auth_ctx["T"]),
auth_ctx["ephemeral_public_key"],
auth_ctx["commitments"],
auth_ctx["initial_linkage_tag"],
client_proof)
msg_chain.server_proofs = [daga.ServerProof(*x) for x in d["server_proofs"]]
server.authenticate_client(ac, msg_chain)
sp = msg_chain.server_proofs[-1]
return {"proof" : (sp.T, sp.c, sp.r1, sp.r2)}
@route("/internal/check_challenge_response", method="POST")
def internal_check_challenge_response():
return _internal_check_challenge_response(request.json)
def _internal_bind_linkage_tag(d):
auth_ctx = state.active_auths[d["auth_id"]]
ac, server = state.contexts[auth_ctx["uuid"]]
client_proof = daga.ClientProof(auth_ctx["C"], auth_ctx["R"])
msg_chain = daga.VerificationChain(daga.Challenge(auth_ctx["challenge"], auth_ctx["T"]),
auth_ctx["ephemeral_public_key"],
auth_ctx["commitments"],
auth_ctx["initial_linkage_tag"],
client_proof)
msg_chain.server_proofs = [daga.ServerProof(*x) for x in d["server_proofs"]]
# Verify everyone.
for i in range(len(ac.server_keys)):
msg_chain.check_server_proof(ac, i)
sig = daga.dsa_sign(server.private_key, d["bind"])
linkage_tag = msg_chain.server_proofs[-1].T
state.bindings[linkage_tag] = (d["bind"], sig)
return {
"tag" : linkage_tag,
"tag_sig" : daga.dsa_sign(server.private_key, linkage_tag),
"binding_sig" : sig
}
@route("/internal/bind_linkage_tag", method="POST")
def internal_bind_linkage_tag():
return _internal_bind_linkage_tag(request.json)
def internal_call(me, srv, name, data):
if srv == me.id:
return globals()["_internal_" + name](data)
return requests.post("http://localhost:{}/internal/{}".format(12345 + srv, name),
headers={"content-type" : "application/json"},
data=json.dumps(data)).json()
@route("/request_challenge", method="POST")
def request_challenge():
client_data = request.json
ac, server = state.contexts[client_data["uuid"]]
auth_id = str(uuid.uuid4())
r = {
"auth_id" : auth_id,
"client_data" : client_data,
}
challenge_parts = []
for i in range(len(ac.server_keys)):
d = internal_call(server, i, "begin_challenge_generation", r)
challenge_parts.append((d["n"], d["sig"]))
r = {
"auth_id" : auth_id,
"parts" : challenge_parts,
}
sigs = []
for i in range(len(ac.server_keys)):
d = internal_call(server, i, "finish_challenge_generation", r)
challenge = d["challenge"]
sigs.append(d["sig"])
return {"auth_id" : auth_id, "challenge" : challenge, "sigs" : sigs}
@route("/authenticate", method="POST")
def authenticate():
client_data = request.json
auth_ctx = state.active_auths[client_data["auth_id"]]
ac, server = state.contexts[auth_ctx["uuid"]]
proofs = []
r = {
"auth_id" : client_data["auth_id"],
"C" : client_data["C"],
"R" : client_data["R"],
"server_proofs" : proofs, # Will be mutated.
}
for i in range(len(ac.server_keys)):
d = internal_call(server, i, "check_challenge_response", r)
proofs.append(d["proof"])
r = {
"auth_id" : client_data["auth_id"],
"bind" : client_data["bind"],
"server_proofs" : proofs,
}
sigs = []
binding_sigs = []
for i in range(len(ac.server_keys)):
d = internal_call(server, i, "bind_linkage_tag", r)
tag = d["tag"]
sigs.append(d["tag_sig"])
binding_sigs.append(d["binding_sig"])
return {
"tag" : tag,
"tag_sigs" : sigs,
"binding_sigs" : binding_sigs,
}
def main():
global state
p = argparse.ArgumentParser(description="Generate a DAGA auth context")
p.add_argument("auth_context")
p.add_argument("private_data")
opts = p.parse_args()
with open(opts.auth_context, "r", encoding="utf-8") as fp:
ac_data = json.load(fp)
uuid = ac_data["uuid"]
ac = daga.AuthenticationContext(
ac_data["client_public_keys"],
ac_data["server_public_keys"],
ac_data["server_randomness"],
ac_data["generators"]
)
with open(opts.private_data, "r", encoding="utf-8") as fp:
priv_data = json.load(fp)
server = daga.Server(priv_data["n"], priv_data["private_key"], priv_data["secret"])
state = GlobalState({uuid : (ac, server)})
run(port=server.id + 12345)
if __name__ == "__main__":
main()