298 lines
9.2 KiB
C++
298 lines
9.2 KiB
C++
/*
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PIP - Platform Independent Primitives
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PIP Authentication API
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Andrey Bychkov work.a.b@yandex.ru
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "piauth.h"
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#define PIAUTH_NOISE_MAX_SIZE 256
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PIAuth::PIAuth(const PIByteArray & sign) : PIObject() {
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setName("Client");
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role = Client;
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state = NotConnected;
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sign_sk = sign;
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sign_pk = crypt.extractSignPublicKey(sign);
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}
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void PIAuth::setServerPassword(const PIString & ps) {
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pass_hash = crypt.passwordHash(ps, PIString("PIAuth").toByteArray());
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}
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void PIAuth::stop() {
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role = Client;
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state = NotConnected;
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auth_sign.clear();
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box_sk.clear();
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box_pk.clear();
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my_pk.clear();
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}
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void PIAuth::startClient() {
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role = Client;
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state = AuthProbe;
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}
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PIByteArray PIAuth::startServer() {
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setName("Server");
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role = Server;
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state = AuthProbe;
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PIByteArray ba;
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crypt.generateKeypair(my_pk, box_sk);
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PIByteArray noise = crypt.generateRandomBuff(randomi()%PIAUTH_NOISE_MAX_SIZE+128);
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ba << (int)state << custom_info << sign_pk << my_pk << noise;
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PIByteArray sign = crypt.signMessage(ba, sign_sk);
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ba << sign;
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return ba;
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}
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PIAuth::State PIAuth::receive(PIByteArray & ba) {
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if (ba.size() < sizeof(int)) return disconnect(ba, "invalid data size");
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State rstate;
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int s;
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ba >> s;
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rstate = (State)s;
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// if (state != rstate) return disconect(ba);
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//client side
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if (role == Client) {
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if (state == AuthProbe && rstate == AuthProbe) {
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if (ba.size() < sizeof(int)*5) return disconnect(ba, "invalid data size");
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PIByteArray rinfo;
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PIByteArray rsign;
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PIByteArray rsign_pk;
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PIByteArray noise;
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ba >> rinfo >> rsign_pk >> box_pk >> noise >> rsign;
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if (rsign_pk.isEmpty() || box_pk.isEmpty() || rsign.isEmpty()) return disconnect(ba, "invalid key size");
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PIByteArray tba;
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tba << (int)rstate << rinfo << rsign_pk << box_pk << noise;
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if (!crypt.verifySign(tba, rsign, rsign_pk)) return disconnect(ba, "Incorrect sign");
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bool auth = false;
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if (isAuthorizedKey(rsign_pk)) {
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auth = true;
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} else {
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authorize(rinfo, &auth);
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if (auth) auth_pkeys << rsign_pk;
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}
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if (!auth) return disconnect(ba, "Unauthorised");
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ba.clear();
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auth_sign = rsign_pk;
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crypt.generateKeypair(my_pk, box_sk);
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tba.clear();
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tba << sign_pk << my_pk << box_pk;
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PIByteArray sign = crypt.signMessage(tba, sign_sk);
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tba << sign;
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tba = crypt.crypt(tba, box_pk, box_sk);
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state = AuthReply;
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noise = crypt.generateRandomBuff(randomi()%PIAUTH_NOISE_MAX_SIZE);
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ba << (int)state << tba << my_pk << noise;
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sign = crypt.signMessage(ba, sign_sk);
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ba << sign;
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return state;
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}
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if (state == AuthReply && rstate == PassRequest) {
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PIByteArray ctba, tba;
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PIByteArray noise;
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PIByteArray rsign, rsign_pk;
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ba >> ctba >> rsign;
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bool ok = false;
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tba = crypt.decrypt(ctba, box_pk, box_sk, &ok);
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if (tba.isEmpty() || !ok) return disconnect(ba, "Message corrupted");
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ba.clear();
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ba << (int)rstate << ctba;
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if (!crypt.verifySign(ba, rsign, auth_sign)) return disconnect(ba, "Incorrect sign");
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ctba.clear();
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tba >> rsign_pk >> noise >> ctba;
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if (rsign_pk != auth_sign || ctba != my_pk) return disconnect(ba, "Invalid public key");
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PIString ps;
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PIByteArray ph;
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passwordRequest(&ps);
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if (ps.isEmpty()) return disconnect(ba, "Canceled by user");
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ph = crypt.passwordHash(ps, PIString("PIAuth").toByteArray());
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ps.fill(0);
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tba.clear();
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tba << ph << auth_sign << sign_pk;
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tba = crypt.crypt(tba, box_pk, box_sk);
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ba.clear();
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state = PassRequest;
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ba << (int)state << tba;
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rsign = crypt.signMessage(ba, sign_sk);
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ba << rsign;
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return state;
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}
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if ((state == AuthReply && rstate == KeyExchange) || (state == PassRequest && rstate == KeyExchange)) {
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PIByteArray tba, ctba;
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PIByteArray rsign;
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ba >> ctba >> rsign;
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bool ok = false;
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tba = crypt.decrypt(ctba, box_pk, box_sk, &ok);
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if (tba.isEmpty() || !ok) return disconnect(ba, "Message corrupted");
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ba.clear();
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ba << (int)rstate << ctba;
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if (!crypt.verifySign(ba, rsign, auth_sign)) return disconnect(ba, "Incorrect sign");
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tba >> secret_key;
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if (secret_key.size() != crypt.sizeKey()) return disconnect(ba, "Invalid key");
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ba.clear();
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state = Connected;
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connected(PIString());
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ba << (int)state << crypt.crypt(custom_info, secret_key) << crypt.generateRandomBuff(randomi()%PIAUTH_NOISE_MAX_SIZE);
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return state;
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}
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if (state == Connected && rstate == Connected) {
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ba.clear();
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state = Connected;
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connected(PIString());
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ba << (int)state << crypt.crypt(custom_info, secret_key) << crypt.generateRandomBuff(randomi()%PIAUTH_NOISE_MAX_SIZE);
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return state;
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}
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}
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// server side
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if (role == Server) {
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if (state == AuthProbe && rstate == AuthReply) {
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if (ba.size() < sizeof(int)*4) return disconnect(ba, "invalid data size");
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PIByteArray ctba, tba;
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PIByteArray noise;
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PIByteArray rsign1, rsign2;
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PIByteArray rsign_pk;
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PIByteArray pk, mpk;
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ba >> ctba >> pk >> noise >> rsign1;
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bool ok = false;
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tba = crypt.decrypt(ctba, pk, box_sk, &ok);
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if (tba.isEmpty() || !ok) return disconnect(ba, "Message corrupted");
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if (tba.size() < sizeof(int)*3) return disconnect(tba, "invalid data size");
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tba >> rsign_pk >> box_pk >> mpk >> rsign2;
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if (pk != box_pk || mpk != my_pk) return disconnect(ba, "Invalid public key");
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ba.clear();
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ba << (int)rstate << ctba << box_pk << noise;
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if (!crypt.verifySign(ba, rsign1, rsign_pk)) return disconnect(ba, "Incorrect sign");
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ba.clear();
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ba << rsign_pk << box_pk << my_pk;
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if (!crypt.verifySign(ba, rsign2, rsign_pk)) return disconnect(ba, "Incorrect sign");
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auth_sign = rsign_pk;
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if (isAuthorizedKey(rsign_pk)) {
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state = KeyExchange;
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ba = createSKMessage();
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return state;
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} else {
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ba.clear();
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tba.clear();
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state = PassRequest;
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noise = crypt.generateRandomBuff(randomi()%PIAUTH_NOISE_MAX_SIZE);
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tba << sign_pk << noise << box_pk;
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tba = crypt.crypt(tba, box_pk, box_sk);
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ba << (int)state << tba;
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rsign1 = crypt.signMessage(ba, sign_sk);
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ba << rsign1;
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return state;
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}
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}
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if (state == PassRequest && rstate == PassRequest) {
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PIByteArray tba, ctba;
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PIByteArray rsign_pk, rsign, mpk;
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ba >> ctba >> rsign;
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bool ok = false;
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tba = crypt.decrypt(ctba, box_pk, box_sk, &ok);
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if (tba.isEmpty() || !ok) return disconnect(ba, "Message corrupted");
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ba.clear();
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ba << (int)rstate << ctba;
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if (!crypt.verifySign(ba, rsign, auth_sign)) return disconnect(ba, "Incorrect sign");
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ctba.clear();
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tba >> ctba >> mpk >> rsign_pk;
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if (rsign_pk != auth_sign || mpk != sign_pk) return disconnect(ba, "Invalid public key");
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bool auth = (ctba == pass_hash);
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if (ctba.isEmpty() || pass_hash.isEmpty()) auth = false;
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passwordCheck(auth);
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if (!auth) {
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// piSleep(1);
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return disconnect(ba, "Invalid password");
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}
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state = KeyExchange;
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ba = createSKMessage();
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return state;
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}
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if ((state == KeyExchange && rstate == Connected) || (state == Connected && rstate == Connected)) {
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ba.clear();
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PIByteArray rinfo;
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ba >> rinfo;
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bool ok = false;
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rinfo = crypt.decrypt(rinfo, secret_key, &ok);
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if (!ok) return disconnect(ba, "Error while exchange keys");
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state = Connected;
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connected(rinfo);
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ba << (int)state << crypt.generateRandomBuff(randomi()%PIAUTH_NOISE_MAX_SIZE);
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return state;
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}
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}
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return disconnect(ba, "invalid state " + PIString::fromNumber((int)state));
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}
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PIByteArray PIAuth::getSecretKey() {
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if (state == Connected) return secret_key;
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return PIByteArray();
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}
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PIByteArray PIAuth::generateSign(const PIByteArray & seed) {
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PIByteArray pk, sk;
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PICrypt::generateSignKeys(pk, sk, seed);
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return sk;
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}
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PIAuth::State PIAuth::disconnect(PIByteArray & ba, const PIString & error) {
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if (!error.isEmpty()) piCoutObj << error;
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auth_sign.clear();
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box_sk.clear();
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box_pk.clear();
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my_pk.clear();
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secret_key.clear();
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ba.clear();
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state = NotConnected;
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disconnected(error);
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return state;
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}
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bool PIAuth::isAuthorizedKey(const PIByteArray & pkey) {
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for (int i=0; i<auth_pkeys.size_s(); ++i) {
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if (pkey == auth_pkeys[i]) return true;
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}
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return false;
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}
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PIByteArray PIAuth::createSKMessage() {
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secret_key = crypt.generateKey();
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PIByteArray tba;
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PIByteArray noise = crypt.generateRandomBuff(randomi()%PIAUTH_NOISE_MAX_SIZE);
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tba << secret_key << noise;
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tba = crypt.crypt(tba, box_pk, box_sk);
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PIByteArray ret;
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ret << (int)state << tba;
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PIByteArray sign = crypt.signMessage(ret, sign_sk);
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ret << sign;
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return ret;
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}
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