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Implement closed group logic changes

Browse Source
pull/387/head
Niels Andriesse 4 years ago
parent 2763ee0d1a
commit f2f5dcdfc2
3 changed files with 73 additions and 68 deletions
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2
Session/Conversations/Settings/OWSConversationSettingsViewController.m
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@ -860,7 +860,7 @@ CGFloat kIconViewLength = 24;
if (gThread.isClosedGroup) {
NSString *groupPublicKey = [LKGroupUtilities getDecodedGroupID:gThread.groupModel.groupId];
[LKStorage writeSyncWithBlock:^(YapDatabaseReadWriteTransaction *_Nonnull transaction) {
[SNMessageSender leaveClosedGroupWithPublicKey:groupPublicKey using:transaction error:nil];
[[SNMessageSender leaveClosedGroupWithPublicKey:groupPublicKey using:transaction] retainUntilComplete];
}];
}

37
SessionMessagingKit/Sending & Receiving/MessageReceiver+Handling.swift
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@ -377,7 +377,6 @@ extension MessageReceiver {
}
private static func handleNewClosedGroup(_ message: ClosedGroupControlMessage, using transaction: Any) {
// Prepare
guard case let .new(publicKeyAsData, name, encryptionKeyPair, membersAsData, adminsAsData) = message.kind else { return }
let groupPublicKey = publicKeyAsData.toHexString()
let members = membersAsData.map { $0.toHexString() }
@ -426,8 +425,8 @@ extension MessageReceiver {
guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
return SNLog("Ignoring closed group encryption key pair for nonexistent group.")
}
guard thread.groupModel.groupMemberIds.contains(message.sender!) else {
return SNLog("Ignoring closed group encryption key pair from non-member.")
guard thread.groupModel.groupAdminIds.contains(message.sender!) else {
return SNLog("Ignoring closed group encryption key pair from non-admin.")
}
// Find our wrapper and decrypt it if possible
guard let wrapper = wrappers.first(where: { $0.publicKey == userPublicKey }), let encryptedKeyPair = wrapper.encryptedKeyPair else { return }
@ -507,6 +506,10 @@ extension MessageReceiver {
guard members.contains(group.groupAdminIds.first!) else {
return SNLog("Ignoring invalid closed group update.")
}
// Check that the message was sent by the group admin
guard group.groupAdminIds.contains(message.sender!) else {
return SNLog("Ignoring invalid closed group update.")
}
// If the current user was removed:
// • Stop polling for the group
// • Remove the key pairs associated with the group
@ -518,16 +521,6 @@ extension MessageReceiver {
Storage.shared.removeAllClosedGroupEncryptionKeyPairs(for: groupPublicKey, using: transaction)
let _ = PushNotificationAPI.performOperation(.unsubscribe, for: groupPublicKey, publicKey: userPublicKey)
}
// Generate and distribute a new encryption key pair if needed
// NOTE: If we're the admin we can be sure at this point that we weren't removed
let isCurrentUserAdmin = group.groupAdminIds.contains(getUserHexEncodedPublicKey())
if isCurrentUserAdmin {
do {
try MessageSender.generateAndSendNewEncryptionKeyPair(for: groupPublicKey, to: Set(members), using: transaction)
} catch {
SNLog("Couldn't distribute new encryption key pair.")
}
}
// Update the group
let newGroupModel = TSGroupModel(title: group.groupName, memberIds: [String](members), image: nil, groupId: groupID, groupType: .closedGroup, adminIds: group.groupAdminIds)
thread.setGroupModel(newGroupModel, with: transaction)
@ -547,25 +540,17 @@ extension MessageReceiver {
performIfValid(for: message, using: transaction) { groupID, thread, group in
let didAdminLeave = group.groupAdminIds.contains(message.sender!)
let members: Set<String> = didAdminLeave ? [] : Set(group.groupMemberIds).subtracting([ message.sender! ]) // If the admin leaves the group is disbanded
let userPublicKey = getUserHexEncodedPublicKey()
let isCurrentUserAdmin = group.groupAdminIds.contains(userPublicKey)
// If a regular member left:
// • Distribute a new encryption key pair if we're the admin of the group
// • Mark them as a zombie (to be removed by the admin later)
// If the admin left:
// • Don't distribute a new encryption key pair
// • Unsubscribe from PNs, delete the group public key, etc. as the group will be disbanded
if didAdminLeave {
// Remove the group from the database and unsubscribe from PNs
Storage.shared.removeAllClosedGroupEncryptionKeyPairs(for: groupPublicKey, using: transaction)
Storage.shared.removeClosedGroupPublicKey(groupPublicKey, using: transaction)
let _ = PushNotificationAPI.performOperation(.unsubscribe, for: groupPublicKey, publicKey: userPublicKey)
} else if isCurrentUserAdmin {
// Generate and distribute a new encryption key pair if needed
do {
try MessageSender.generateAndSendNewEncryptionKeyPair(for: groupPublicKey, to: members, using: transaction)
} catch {
SNLog("Couldn't distribute new encryption key pair.")
}
let _ = PushNotificationAPI.performOperation(.unsubscribe, for: groupPublicKey, publicKey: getUserHexEncodedPublicKey())
} else {
// TODO: Mark as zombie
}
// Update the group
let newGroupModel = TSGroupModel(title: group.groupName, memberIds: [String](members), image: nil, groupId: groupID, groupType: .closedGroup, adminIds: group.groupAdminIds)
@ -579,6 +564,7 @@ extension MessageReceiver {
}
private static func handleClosedGroupEncryptionKeyPairRequest(_ message: ClosedGroupControlMessage, using transaction: Any) {
/*
guard case .encryptionKeyPairRequest = message.kind else { return }
let transaction = transaction as! YapDatabaseReadWriteTransaction
guard let groupPublicKey = message.groupPublicKey else { return }
@ -590,6 +576,7 @@ extension MessageReceiver {
}
MessageSender.sendLatestEncryptionKeyPair(to: publicKey, for: groupPublicKey, using: transaction)
}
*/
}
private static func performIfValid(for message: ClosedGroupControlMessage, using transaction: Any, _ update: (Data, TSGroupThread, TSGroupModel) -> Void) {

102
SessionMessagingKit/Sending & Receiving/MessageSender+ClosedGroups.swift
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@ -29,6 +29,8 @@ extension MessageSender {
let closedGroupControlMessageKind = ClosedGroupControlMessage.Kind.new(publicKey: Data(hex: groupPublicKey), name: name,
encryptionKeyPair: encryptionKeyPair, members: membersAsData, admins: adminsAsData)
let closedGroupControlMessage = ClosedGroupControlMessage(kind: closedGroupControlMessageKind)
// Sending this non-durably is okay because we show a loader to the user. If they close the app while the
// loader is still showing, it's within expectation that the group creation might be incomplete.
let promise = MessageSender.sendNonDurably(closedGroupControlMessage, in: thread, using: transaction)
promises.append(promise)
}
@ -45,34 +47,34 @@ extension MessageSender {
return when(fulfilled: promises).map2 { thread }
}
public static func generateAndSendNewEncryptionKeyPair(for groupPublicKey: String, to targetMembers: Set<String>, using transaction: Any) throws {
public static func generateAndSendNewEncryptionKeyPair(for groupPublicKey: String, to targetMembers: Set<String>, using transaction: Any) -> Promise<Void> {
// Prepare
let transaction = transaction as! YapDatabaseReadWriteTransaction
let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
let threadID = TSGroupThread.threadId(fromGroupId: groupID)
guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
SNLog("Can't distribute new encryption key pair for nonexistent closed group.")
throw Error.noThread
return Promise(error: Error.noThread)
}
guard thread.groupModel.groupAdminIds.contains(getUserHexEncodedPublicKey()) else {
SNLog("Can't distribute new encryption key pair as a non-admin.")
throw Error.invalidClosedGroupUpdate
return Promise(error: Error.invalidClosedGroupUpdate)
}
// Generate the new encryption key pair
let newKeyPair = Curve25519.generateKeyPair()
// Distribute it
let proto = try SNProtoKeyPair.builder(publicKey: newKeyPair.publicKey,
let proto = try! SNProtoKeyPair.builder(publicKey: newKeyPair.publicKey,
privateKey: newKeyPair.privateKey).build()
let plaintext = try proto.serializedData()
let wrappers = try targetMembers.compactMap { publicKey -> ClosedGroupControlMessage.KeyPairWrapper in
let ciphertext = try MessageSender.encryptWithSessionProtocol(plaintext, for: publicKey)
let plaintext = try! proto.serializedData()
let wrappers = targetMembers.compactMap { publicKey -> ClosedGroupControlMessage.KeyPairWrapper in
let ciphertext = try! MessageSender.encryptWithSessionProtocol(plaintext, for: publicKey)
return ClosedGroupControlMessage.KeyPairWrapper(publicKey: publicKey, encryptedKeyPair: ciphertext)
}
let closedGroupControlMessage = ClosedGroupControlMessage(kind: .encryptionKeyPair(publicKey: nil, wrappers: wrappers))
var distributingKeyPairs = distributingClosedGroupEncryptionKeyPairs[groupPublicKey] ?? []
distributingKeyPairs.append(newKeyPair)
distributingClosedGroupEncryptionKeyPairs[groupPublicKey] = distributingKeyPairs
let _ = MessageSender.sendNonDurably(closedGroupControlMessage, in: thread, using: transaction).done { // FIXME: It'd be great if we could make this a durable operation
return MessageSender.sendNonDurably(closedGroupControlMessage, in: thread, using: transaction).done {
// Store it * after * having sent out the message to the group
SNMessagingKitConfiguration.shared.storage.write { transaction in
Storage.shared.addClosedGroupEncryptionKeyPair(newKeyPair, for: groupPublicKey, using: transaction)
@ -82,39 +84,42 @@ extension MessageSender {
distributingKeyPairs.remove(at: index)
}
distributingClosedGroupEncryptionKeyPairs[groupPublicKey] = distributingKeyPairs
}
}.map { _ in }
}
public static func update(_ groupPublicKey: String, with members: Set<String>, name: String, transaction: YapDatabaseReadWriteTransaction) throws {
public static func update(_ groupPublicKey: String, with members: Set<String>, name: String, transaction: YapDatabaseReadWriteTransaction) -> Promise<Void> {
// Get the group, check preconditions & prepare
let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
let threadID = TSGroupThread.threadId(fromGroupId: groupID)
guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
SNLog("Can't update nonexistent closed group.")
throw Error.noThread
return Promise(error: Error.noThread)
}
let group = thread.groupModel
var promises: [Promise<Void>] = []
// Update name if needed
if name != group.groupName { try setName(to: name, for: groupPublicKey, using: transaction) }
if name != group.groupName { promises.append(setName(to: name, for: groupPublicKey, using: transaction)) }
// Add members if needed
let addedMembers = members.subtracting(group.groupMemberIds)
if !addedMembers.isEmpty { try addMembers(addedMembers, to: groupPublicKey, using: transaction) }
if !addedMembers.isEmpty { promises.append(addMembers(addedMembers, to: groupPublicKey, using: transaction)) }
// Remove members if needed
let removedMembers = Set(group.groupMemberIds).subtracting(members)
if !removedMembers.isEmpty { try removeMembers(removedMembers, to: groupPublicKey, using: transaction) }
if !removedMembers.isEmpty { promises.append(removeMembers(removedMembers, to: groupPublicKey, using: transaction)) }
// Return
return when(fulfilled: promises).map2 { _ in }
}
public static func setName(to name: String, for groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) throws {
public static func setName(to name: String, for groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) -> Promise<Void> {
// Get the group, check preconditions & prepare
let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
let threadID = TSGroupThread.threadId(fromGroupId: groupID)
guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
SNLog("Can't change name for nonexistent closed group.")
throw Error.noThread
return Promise(error: Error.noThread)
}
guard !name.isEmpty else {
SNLog("Can't set closed group name to an empty value.")
throw Error.invalidClosedGroupUpdate
return Promise(error: Error.invalidClosedGroupUpdate)
}
let group = thread.groupModel
// Send the update to the group
@ -127,19 +132,21 @@ extension MessageSender {
let updateInfo = group.getInfoStringAboutUpdate(to: newGroupModel)
let infoMessage = TSInfoMessage(timestamp: NSDate.ows_millisecondTimeStamp(), in: thread, messageType: .groupUpdate, customMessage: updateInfo)
infoMessage.save(with: transaction)
// Return
return Promise.value(())
}
public static func addMembers(_ newMembers: Set<String>, to groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) throws {
public static func addMembers(_ newMembers: Set<String>, to groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) -> Promise<Void> {
// Get the group, check preconditions & prepare
let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
let threadID = TSGroupThread.threadId(fromGroupId: groupID)
guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
SNLog("Can't add members to nonexistent closed group.")
throw Error.noThread
return Promise(error: Error.noThread)
}
guard !newMembers.isEmpty else {
SNLog("Invalid closed group update.")
throw Error.invalidClosedGroupUpdate
return Promise(error: Error.invalidClosedGroupUpdate)
}
let group = thread.groupModel
let members = [String](Set(group.groupMemberIds).union(newMembers))
@ -147,7 +154,7 @@ extension MessageSender {
let adminsAsData = group.groupAdminIds.map { Data(hex: $0) }
guard let encryptionKeyPair = Storage.shared.getLatestClosedGroupEncryptionKeyPair(for: groupPublicKey) else {
SNLog("Couldn't find encryption key pair for closed group: \(groupPublicKey).")
throw Error.noKeyPair
return Promise(error: Error.noKeyPair)
}
// Send the update to the group
let closedGroupControlMessage = ClosedGroupControlMessage(kind: .membersAdded(members: newMembers.map { Data(hex: $0) }))
@ -168,37 +175,38 @@ extension MessageSender {
let updateInfo = group.getInfoStringAboutUpdate(to: newGroupModel)
let infoMessage = TSInfoMessage(timestamp: NSDate.ows_millisecondTimeStamp(), in: thread, messageType: .groupUpdate, customMessage: updateInfo)
infoMessage.save(with: transaction)
// Return
return Promise.value(())
}
public static func removeMembers(_ membersToRemove: Set<String>, to groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) throws {
public static func removeMembers(_ membersToRemove: Set<String>, to groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) -> Promise<Void> {
// Get the group, check preconditions & prepare
let userPublicKey = getUserHexEncodedPublicKey()
let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
let threadID = TSGroupThread.threadId(fromGroupId: groupID)
guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
SNLog("Can't remove members from nonexistent closed group.")
throw Error.noThread
return Promise(error: Error.noThread)
}
guard !membersToRemove.isEmpty else {
SNLog("Invalid closed group update.")
throw Error.invalidClosedGroupUpdate
return Promise(error: Error.invalidClosedGroupUpdate)
}
guard !membersToRemove.contains(userPublicKey) else {
SNLog("Invalid closed group update.")
throw Error.invalidClosedGroupUpdate
return Promise(error: Error.invalidClosedGroupUpdate)
}
let group = thread.groupModel
guard group.groupAdminIds.contains(userPublicKey) else {
SNLog("Only an admin can remove members from a group.")
return Promise(error: Error.invalidClosedGroupUpdate)
}
let members = Set(group.groupMemberIds).subtracting(membersToRemove)
let isCurrentUserAdmin = group.groupAdminIds.contains(userPublicKey)
// Send the update to the group and generate + distribute a new encryption key pair if needed
// Send the update to the group and generate + distribute a new encryption key pair
let closedGroupControlMessage = ClosedGroupControlMessage(kind: .membersRemoved(members: membersToRemove.map { Data(hex: $0) }))
if isCurrentUserAdmin {
let _ = MessageSender.sendNonDurably(closedGroupControlMessage, in: thread, using: transaction).done {
try generateAndSendNewEncryptionKeyPair(for: groupPublicKey, to: members, using: transaction)
}
} else {
MessageSender.send(closedGroupControlMessage, in: thread, using: transaction)
}
let promise = MessageSender.sendNonDurably(closedGroupControlMessage, in: thread, using: transaction).map {
generateAndSendNewEncryptionKeyPair(for: groupPublicKey, to: members, using: transaction)
}.map { _ in }
// Update the group
let newGroupModel = TSGroupModel(title: group.groupName, memberIds: [String](members), image: nil, groupId: groupID, groupType: .closedGroup, adminIds: group.groupAdminIds)
thread.setGroupModel(newGroupModel, with: transaction)
@ -206,16 +214,22 @@ extension MessageSender {
let updateInfo = group.getInfoStringAboutUpdate(to: newGroupModel)
let infoMessage = TSInfoMessage(timestamp: NSDate.ows_millisecondTimeStamp(), in: thread, messageType: .groupUpdate, customMessage: updateInfo)
infoMessage.save(with: transaction)
// Return
return promise
}
@objc(leaveClosedGroupWithPublicKey:using:)
public static func objc_leave(_ groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) -> AnyPromise {
return AnyPromise.from(leave(groupPublicKey, using: transaction))
}
@objc(leaveClosedGroupWithPublicKey:using:error:)
public static func leave(_ groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) throws {
public static func leave(_ groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) -> Promise<Void> {
// Get the group, check preconditions & prepare
let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
let threadID = TSGroupThread.threadId(fromGroupId: groupID)
guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
SNLog("Can't leave nonexistent closed group.")
throw Error.noThread
return Promise(error: Error.noThread)
}
let group = thread.groupModel
let userPublicKey = getUserHexEncodedPublicKey()
@ -224,14 +238,14 @@ extension MessageSender {
let admins: Set<String> = isCurrentUserAdmin ? [] : Set(group.groupAdminIds)
// Send the update to the group
let closedGroupControlMessage = ClosedGroupControlMessage(kind: .memberLeft)
let _ = MessageSender.sendNonDurably(closedGroupControlMessage, in: thread, using: transaction).done {
let promise = MessageSender.sendNonDurably(closedGroupControlMessage, in: thread, using: transaction).done {
SNMessagingKitConfiguration.shared.storage.write { transaction in
// Remove the group from the database and unsubscribe from PNs
Storage.shared.removeAllClosedGroupEncryptionKeyPairs(for: groupPublicKey, using: transaction)
Storage.shared.removeClosedGroupPublicKey(groupPublicKey, using: transaction)
let _ = PushNotificationAPI.performOperation(.unsubscribe, for: groupPublicKey, publicKey: userPublicKey)
}
}
}.map { _ in }
// Update the group
let newGroupModel = TSGroupModel(title: group.groupName, memberIds: [String](members), image: nil, groupId: groupID, groupType: .closedGroup, adminIds: [String](admins))
thread.setGroupModel(newGroupModel, with: transaction)
@ -239,8 +253,11 @@ extension MessageSender {
let updateInfo = group.getInfoStringAboutUpdate(to: newGroupModel)
let infoMessage = TSInfoMessage(timestamp: NSDate.ows_millisecondTimeStamp(), in: thread, messageType: .groupUpdate, customMessage: updateInfo)
infoMessage.save(with: transaction)
// Return
return promise
}
/*
public static func requestEncryptionKeyPair(for groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) throws {
#if DEBUG
preconditionFailure("Shouldn't currently be in use.")
@ -258,15 +275,16 @@ extension MessageSender {
let closedGroupControlMessage = ClosedGroupControlMessage(kind: .encryptionKeyPairRequest)
MessageSender.send(closedGroupControlMessage, in: thread, using: transaction)
}
*/
public static func sendLatestEncryptionKeyPair(to publicKey: String, for groupPublicKey: String, using transaction: YapDatabaseReadWriteTransaction) {
// Check that the user in question is part of the closed group
let groupID = LKGroupUtilities.getEncodedClosedGroupIDAsData(groupPublicKey)
let threadID = TSGroupThread.threadId(fromGroupId: groupID)
guard let thread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
return SNLog("Couldn't find thread .")
guard let groupThread = TSGroupThread.fetch(uniqueId: threadID, transaction: transaction) else {
return SNLog("Couldn't send key pair for nonexistent closed group.")
}
let group = thread.groupModel
let group = groupThread.groupModel
guard group.groupMemberIds.contains(publicKey) else {
return SNLog("Refusing to send latest encryption key pair to non-member.")
}

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