| author | Edouard Tisserant <edouard@pep-project.org> |
| Sun, 04 Dec 2016 02:51:59 +0100 | |
| branch | ENGINE-133 |
| changeset 1460 | 66ceb5a7f718 |
| parent 1459 | ab329d7db8d7 |
| child 1477 | c0d761ae1fd9 |
| permissions | -rw-r--r-- |
| vb@563 | 1 |
// DeviceGroup protocol for p≡p |
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|
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// Copyleft (c) 2016, p≡p foundation |
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|
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// Written by Volker Birk |
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|
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include ./fsm.yml2 |
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|
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protocol DeviceGroup {
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// all messages have a timestamp, time out and are removed after timeout |
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|
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broadcast sendBeacon; |
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broadcast sendGroupUpdate; |
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broadcast sendUpdateRequest; |
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unencrypted sendBeacon; |
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|
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fsm DeviceState filename=sync {
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condition storedGroupKeys(); |
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condition keyElectionWon(Identity partner); |
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|
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state InitState {
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on Init {
|
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if storedGroupKeys() |
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go Grouped; |
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go Sole; |
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} |
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} |
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|
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state Sole end=1 {
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on KeyGen // injected by generate_keypair() |
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do sendBeacon; |
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on CannotDecrypt |
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do sendBeacon; // cry, baby |
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on Beacon(Identity partner) // this event will not happen for already |
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// rejected partners |
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do sendHandshakeRequest(partner); |
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on HandshakeRequest(Identity partner) {
|
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do sendHandshakeRequest(partner); |
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go HandshakingSole(partner); |
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} |
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} |
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|
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state HandshakingSole timeout=600 (Identity expected) {
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on Init |
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do showHandshake(partner); |
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on HandshakeRejected(Identity partner) {
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do rejectHandshake(partner); // stores rejection of partner |
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go Sole; |
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} |
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on HandshakeAccepted(Identity partner) {
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do acceptHandshake(partner); |
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if keyElectionWon(partner) { // an already existing group
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// always wins |
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do sendGroupKeys(partner); |
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do handshakeGroupCreated(partner); |
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go Grouped; |
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} |
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go WaitForGroupKeysSole(partner); |
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} |
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on Cancel go Sole; |
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on Timeout {
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do dismissHandshake(expected); |
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go Sole; |
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} |
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} |
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|
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state WaitForGroupKeysSole timeout=600 (Identity expected) {
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on GroupKeys(Identity partner, Stringlist keys) {
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// TODO ensure partner == expected |
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do storeGroupKeys(partner, keys); |
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do handshakeSuccess(partner); |
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go Grouped; |
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} |
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on Timeout {
|
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do handshakeFailure(expected); |
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go Sole; |
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} |
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} |
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|
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state Grouped end=1 {
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on Init |
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do enterGroup; |
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on KeyGen |
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do sendGroupUpdate; |
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on CannotDecrypt |
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do sendUpdateRequest; // TODO: narrow request to missing key |
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on UpdateRequest |
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do sendGroupUpdate; |
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on Beacon(Identity partner) |
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do sendHandshakeRequest(partner); |
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on HandshakeRequest(Identity partner) {
|
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do sendHandshakeRequest(partner); |
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go HandshakingGrouped(partner); |
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} |
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on GroupUpdate(Identity partner, Stringlist keys) |
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do storeGroupKeys(partner, keys); |
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} |
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|
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state HandshakingGrouped timeout=600 (Identity expected) {
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on Init |
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do showHandshake(partner); |
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on HandshakeRejected(Identity partner) {
|
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do rejectHandshake(partner); // stores rejection of partner |
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go Grouped; |
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} |
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on HandshakeAccepted(Identity partner) {
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do acceptHandshake(partner); |
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|
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// an already existing group always wins |
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do sendGroupKeys(partner); |
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|
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do handshakeDeviceAdded(partner); |
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|
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go Grouped; |
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} |
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on Timeout {
|
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do handshakeFailure(expected); |
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go Grouped; |
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} |
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} |
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|
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tag Init 1; |
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tag Beacon 2; |
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tag HandshakeRequest 3; |
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tag GroupKeys 4; |
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} |
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} |
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