1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
//
// NCEndToEndMetadata.swift
// Nextcloud
//
// Created by Marino Faggiana on 13/11/17.
// Copyright © 2017 TWS. All rights reserved.
//
// Author Marino Faggiana <m.faggiana@twsweb.it>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
import Foundation
class NCEndToEndMetadata : NSObject {
struct e2eMetadata: Codable {
struct metadataKeyCodable: Codable {
let metadataKeys: [String: String]
let version: Int
}
struct sharingCodable: Codable {
let recipient: [String: String]
}
struct encryptedFileAttributes: Codable {
let key: String
let filename: String
let mimetype: String
let version: Int
}
struct filesCodable: Codable {
let initializationVector: String
let authenticationTag: String
let metadataKey: Int // Number of metadataKey
let encrypted: String // encryptedFileAttributes
}
let files: [String: filesCodable]
let metadata: metadataKeyCodable
let sharing: sharingCodable?
}
@objc static let sharedInstance: NCEndToEndMetadata = {
let instance = NCEndToEndMetadata()
return instance
}()
// --------------------------------------------------------------------------------------------
// MARK: Encode / Decode JSON Metadata
// --------------------------------------------------------------------------------------------
@objc func encoderMetadata(_ recordsE2eEncryption: [tableE2eEncryption], privateKey: String, serverUrl: String, metadataKey: String) -> String? {
let jsonEncoder = JSONEncoder.init()
var files = [String: e2eMetadata.filesCodable]()
var version = 1
var keyGenerated = ""
// Generate Key
if (metadataKey == "") {
keyGenerated = NCEndToEndEncryption.sharedManager().generateKey(16).base64EncodedString() // AES_KEY_128_LENGTH
} else {
keyGenerated = metadataKey
}
// Double Encode64 for Android compatibility OMG
let key = (keyGenerated.data(using: .utf8)?.base64EncodedString())!
guard let metadataKeyEncryptedData = NCEndToEndEncryption.sharedManager().encryptAsymmetricString(key, publicKey: nil, privateKey: privateKey) else {
return nil
}
let metadataKeyBase64 = metadataKeyEncryptedData.base64EncodedString()
// Create "files"
for recordE2eEncryption in recordsE2eEncryption {
let encrypted = e2eMetadata.encryptedFileAttributes(key: recordE2eEncryption.key, filename: recordE2eEncryption.fileName, mimetype: recordE2eEncryption.mimeType, version: recordE2eEncryption.version)
do {
// Create "encrypted"
let encryptedJsonData = try jsonEncoder.encode(encrypted)
let encryptedJsonString = String(data: encryptedJsonData, encoding: .utf8)
guard let encryptedEncryptedJson = NCEndToEndEncryption.sharedManager().encryptEncryptedJson(encryptedJsonString, key: keyGenerated) else {
print("Serious internal error in encoding metadata")
return nil
}
let e2eMetadataFilesKey = e2eMetadata.filesCodable(initializationVector: recordE2eEncryption.initializationVector, authenticationTag: recordE2eEncryption.authenticationTag, metadataKey: 0, encrypted: encryptedEncryptedJson)
files.updateValue(e2eMetadataFilesKey, forKey: recordE2eEncryption.fileNameIdentifier)
} catch let error {
print("Serious internal error in encoding metadata ("+error.localizedDescription+")")
return nil
}
version = recordE2eEncryption.version
}
// Create "metadataKey" with encrypted maetadatakey
let e2eMetadataKey = e2eMetadata.metadataKeyCodable(metadataKeys: ["0":metadataKeyBase64], version: version)
// Create final Json e2emetadata
let e2emetadata = e2eMetadata(files: files, metadata: e2eMetadataKey, sharing: nil)
do {
// Write metadataKey on DB
if NCManageDatabase.sharedInstance.setDirectoryE2EMetadataKey(serverUrl: serverUrl, metadataKey: keyGenerated) == false {
return nil
}
let jsonData = try jsonEncoder.encode(e2emetadata)
let jsonString = String(data: jsonData, encoding: .utf8)
print("JSON String : " + jsonString!)
return jsonString
} catch let error {
print("Serious internal error in encoding metadata ("+error.localizedDescription+")")
return nil
}
}
@objc func decoderMetadata(_ e2eMetaDataJSON: String, privateKey: String, serverUrl: String, account: String, url: String) -> Bool {
let jsonDecoder = JSONDecoder.init()
let data = e2eMetaDataJSON.data(using: .utf8)
do {
let decode = try jsonDecoder.decode(e2eMetadata.self, from: data!)
let files = decode.files
let metadata = decode.metadata
//let sharing = decode.sharing ---> V 2.0
var metadataKeysDictionary = [String:String]()
for metadataKeyDictionaryEncrypted in metadata.metadataKeys {
guard let metadataKeyEncryptedData : NSData = NSData(base64Encoded: metadataKeyDictionaryEncrypted.value, options: NSData.Base64DecodingOptions(rawValue: 0)) else {
return false
}
guard let metadataKeyBase64 = NCEndToEndEncryption.sharedManager().decryptAsymmetricData(metadataKeyEncryptedData as Data!, privateKey: privateKey) else {
return false
}
// Initialize a `Data` from a Base-64 encoded String
let metadataKeyBase64Data = Data(base64Encoded: metadataKeyBase64, options: NSData.Base64DecodingOptions(rawValue: 0))!
let metadataKey = String(data: metadataKeyBase64Data, encoding: .utf8)
metadataKeysDictionary[metadataKeyDictionaryEncrypted.key] = metadataKey
}
for file in files {
let fileNameIdentifier = file.key
let filesCodable = file.value as e2eMetadata.filesCodable
let encrypted = filesCodable.encrypted
let key = metadataKeysDictionary["\(filesCodable.metadataKey)"]
guard let encryptedFileAttributesJson = NCEndToEndEncryption.sharedManager().decryptEncryptedJson(encrypted, key: key) else {
return false
}
do {
let encryptedFileAttributes = try jsonDecoder.decode(e2eMetadata.encryptedFileAttributes.self, from: encryptedFileAttributesJson.data(using: .utf8)!)
let object = tableE2eEncryption()
object.account = account
object.authenticationTag = filesCodable.authenticationTag
object.fileName = encryptedFileAttributes.filename
object.fileNameIdentifier = fileNameIdentifier
object.fileNamePath = CCUtility.returnFileNamePath(fromFileName: encryptedFileAttributes.filename, serverUrl: serverUrl, activeUrl: url)
object.key = encryptedFileAttributes.key
object.initializationVector = filesCodable.initializationVector
object.mimeType = encryptedFileAttributes.mimetype
object.serverUrl = serverUrl
object.version = encryptedFileAttributes.version
// Write file parameter for decrypted on DB
if NCManageDatabase.sharedInstance.addE2eEncryption(object) == false {
return false
}
// Write metadataKey on DB
if NCManageDatabase.sharedInstance.setDirectoryE2EMetadataKey(serverUrl: serverUrl, metadataKey: key!) == false {
return false
}
} catch let error {
print("Serious internal error in decoding metadata ("+error.localizedDescription+")")
return false
}
}
} catch let error {
print("Serious internal error in decoding metadata ("+error.localizedDescription+")")
return false
}
return true
}
}
|
