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Proof-of-concept for MAC logging anonymization
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| // Copyright (c) halo https://github.com/halo/LinkLiar | ||
| // SPDX-License-Identifier: MIT | ||
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| import XCTest | ||
| @testable import LinkLiar | ||
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| class MACAnonymizerTest: XCTestCase { | ||
| let userDefaultsSuiteName = "io.github.halo.LinkLiar.MACAnonymizerTest" | ||
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| func testAnonymization() { | ||
| let input = MAC("00:01:02:00:aa:ff")! | ||
| let userDefaults = UserDefaults(suiteName: userDefaultsSuiteName)! | ||
| userDefaults.set("00:03:05:00:01:01", forKey: "seed") | ||
| let output = MACAnonymizer.anonymize(input, stubUserDefaults: userDefaults) | ||
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| XCTAssertEqual("00:04:07:00:ab:f0", output) | ||
| } | ||
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| func testAnonymizationModulo() { | ||
| let input = MAC("ff:ff:ff:ff:ff:ff")! | ||
| let userDefaults = UserDefaults(suiteName: userDefaultsSuiteName)! | ||
| userDefaults.set("11:00:00:00:10:01", forKey: "seed") | ||
| let output = MACAnonymizer.anonymize(input, stubUserDefaults: userDefaults) | ||
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| XCTAssertEqual("00:ff:ff:ff:0f:f0", output) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| // Copyright (c) halo https://github.com/halo/LinkLiar | ||
| // SPDX-License-Identifier: MIT | ||
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| import Foundation | ||
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| /// Checks a potential MAC address for validity and normalizes it. | ||
| /// | ||
| struct MACAnonymizer { | ||
| // MARK: - Class Methods | ||
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| static func anonymize(_ input: MAC, stubUserDefaults: UserDefaults = .standard) -> String { | ||
| self.init(input, userDefaults: stubUserDefaults).anonymous | ||
| } | ||
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| // MARK: - Private Class Methods | ||
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| private init(_ input: MAC, userDefaults: UserDefaults = .standard) { | ||
| self.input = input | ||
| self.userDefaults = userDefaults | ||
| } | ||
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| // MARK: - Instance Properties | ||
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| var anonymous: String { | ||
| guard let seedAddress = MAC(seed) else { | ||
| return "??:??:??:??:??:??" | ||
| } | ||
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| let plaintext = input.integers | ||
| let key = seedAddress.integers | ||
| let ciphertext = plaintext.enumerated().map { ($1 + key[$0]) % 16 } | ||
| let anonmousAddress = ciphertext.map { String($0, radix: 16) }.joined() | ||
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| guard let output = MAC(anonmousAddress) else { | ||
| return "??:??:??:??:??:??" | ||
| } | ||
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| return output.address | ||
| } | ||
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| /// Fetches the system-wide persisted anonymization seed. | ||
| /// Persists a new one if there is none. | ||
| /// | ||
| private var seed: String { | ||
| if let knownSeed = userDefaults.string(forKey: seedKey) { | ||
| return knownSeed | ||
| } else { | ||
| let newSeed = generateSeed() | ||
| userDefaults.setValue(newSeed, forKey: seedKey) | ||
| return newSeed | ||
| } | ||
| } | ||
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| /// Generates a completely random MAC address. | ||
| /// | ||
| func generateSeed() -> String { | ||
| [ | ||
| String(Int.random(in: 0..<256), radix: 16, uppercase: false), | ||
| String(Int.random(in: 0..<256), radix: 16, uppercase: false), | ||
| String(Int.random(in: 0..<256), radix: 16, uppercase: false), | ||
| String(Int.random(in: 0..<256), radix: 16, uppercase: false), | ||
| String(Int.random(in: 0..<256), radix: 16, uppercase: false), | ||
| String(Int.random(in: 0..<256), radix: 16, uppercase: false) | ||
| ].joined() | ||
| } | ||
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| private let input: MAC | ||
| private let userDefaults: UserDefaults | ||
| private let seedKey = "seed" | ||
| } |
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