380 lines
14 KiB
Swift
380 lines
14 KiB
Swift
//
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// Password.swift
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// pass
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//
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// Created by Mingshen Sun on 2/2/2017.
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// Copyright © 2017 Bob Sun. All rights reserved.
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//
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import Foundation
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import SwiftyUserDefaults
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import OneTimePassword
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import Base32
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public struct AdditionField: Equatable {
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public var title: String = ""
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public var content: String = ""
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var asString: String { return title.isEmpty ? content : title + ": " + content }
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var asTuple: (String, String) { return (title, content) }
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public static func == (first: AdditionField, second: AdditionField) -> Bool {
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return first.asTuple == second.asTuple
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}
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}
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public enum OtpType {
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case totp, hotp, none
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static func from(token: Token?) -> OtpType {
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switch token?.generator.factor {
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case .some(.counter):
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return .hotp
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case .some(.timer):
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return .totp
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default:
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return .none
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}
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}
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}
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enum PasswordChange: Int {
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case path = 0x01
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case content = 0x02
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case none = 0x00
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}
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public class Password {
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public static let OTP_KEYWORDS = ["otp_secret", "otp_type", "otp_algorithm", "otp_period", "otp_digits", "otp_counter", "otpauth"]
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public static let BLANK = " "
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public static let MULTILINE_WITH_LINE_BREAK_INDICATOR = "|"
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public static let MULTILINE_WITH_LINE_BREAK_SEPARATOR = "\n"
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public static let MULTILINE_WITHOUT_LINE_BREAK_INDICATOR = ">"
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public static let MULTILINE_WITHOUT_LINE_BREAK_SEPARATOR = BLANK
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private static let OTPAUTH = "otpauth"
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private static let OTPAUTH_URL_START = "\(OTPAUTH)://"
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private static let PASSWORD_KEYWORD = "password"
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private static let USERNAME_KEYWORD = "username"
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private static let LOGIN_KEYWORD = "login"
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private static let URL_KEYWORD = "url"
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private static let UNKNOWN = "unknown"
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public var name = ""
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public var url: URL?
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public var namePath: String { return url?.deletingPathExtension().path ?? "" }
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public var password = ""
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public var changed: Int = 0
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public var plainText = ""
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public var plainData: Data { return plainText.data(using: .utf8)! }
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public var username: String? { return getAdditionValue(withKey: Password.USERNAME_KEYWORD, caseSensitive: false) }
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public var login: String? { return getAdditionValue(withKey: Password.LOGIN_KEYWORD, caseSensitive: false) }
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public var urlString: String? { return getAdditionValue(withKey: Password.URL_KEYWORD, caseSensitive: false) }
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private var additions = [AdditionField]()
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private var firstLineIsOTPField = false
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private var otpToken: Token?
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public var otpType: OtpType { return OtpType.from(token: self.otpToken) }
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public init(name: String, url: URL?, plainText: String) {
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self.initEverything(name: name, url: url, plainText: plainText)
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}
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public func updatePassword(name: String, url: URL?, plainText: String) {
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if self.plainText != plainText || self.url != url {
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if self.plainText != plainText {
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changed = changed|PasswordChange.content.rawValue
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}
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if self.url != url {
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changed = changed|PasswordChange.path.rawValue
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}
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self.initEverything(name: name, url: url, plainText: plainText)
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}
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}
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private func initEverything(name: String, url: URL?, plainText: String) {
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self.name = name
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self.url = url
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self.plainText = plainText
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additions.removeAll()
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// split the plain text
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let plainTextSplit = self.plainText
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.split(omittingEmptySubsequences: false) { $0 == "\n" || $0 == "\r\n" }
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.map(String.init)
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// get password
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password = plainTextSplit.first ?? ""
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// get remaining lines (filter out empty lines)
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let additionalLines = plainTextSplit[1...].filter { !$0.isEmpty }
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// parse lines to get key-value pairs
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parseDataFrom(lines: additionalLines)
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// check whether the first line looks like an otp entry
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checkPasswordForOtpToken()
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// construct the otp token
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updateOtpToken()
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}
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private func parseDataFrom(lines: [String]) {
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var unknownIndex = 0
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var i = lines.startIndex
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while i < lines.count {
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let line = lines[i]
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i += 1
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var (key, value) = Password.getKeyValuePair(from: line)
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if key == nil {
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unknownIndex += 1
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key = "\(Password.UNKNOWN) \(unknownIndex)"
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} else if value == Password.MULTILINE_WITH_LINE_BREAK_INDICATOR {
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value = gatherMultilineValue(from: lines, startingAt: &i, removingLineBreaks: false)
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} else if value == Password.MULTILINE_WITHOUT_LINE_BREAK_INDICATOR {
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value = gatherMultilineValue(from: lines, startingAt: &i, removingLineBreaks: true)
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}
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additions.append(AdditionField(title: key!, content: value))
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}
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}
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private func gatherMultilineValue(from content: [String], startingAt i: inout Int, removingLineBreaks: Bool) -> String {
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var result = ""
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guard i < content.count else { return result }
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let numberInitialBlanks = content[i].enumerated().first(where: { $1 != Character(Password.BLANK) })?.0 ?? content[i].count
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guard numberInitialBlanks != 0 else { return result }
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let initialBlanks = String(repeating: Password.BLANK, count: numberInitialBlanks)
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while i < content.count && content[i].starts(with: initialBlanks) {
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result.append(String(content[i].dropFirst(numberInitialBlanks)))
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result.append(removingLineBreaks ? Password.MULTILINE_WITHOUT_LINE_BREAK_SEPARATOR : Password.MULTILINE_WITH_LINE_BREAK_SEPARATOR)
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i += 1
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}
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return result.trimmingCharacters(in: .whitespacesAndNewlines)
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}
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private func checkPasswordForOtpToken() {
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let (key, value) = Password.getKeyValuePair(from: self.password)
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if Password.OTP_KEYWORDS.contains(key ?? "") {
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firstLineIsOTPField = true
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self.additions.append(AdditionField(title: key!, content: value))
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} else {
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firstLineIsOTPField = false
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}
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}
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public func getFilteredAdditions() -> [AdditionField] {
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return additions.filter { field in
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field.title.lowercased() != Password.USERNAME_KEYWORD
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&& field.title.lowercased() != Password.LOGIN_KEYWORD
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&& field.title.lowercased() != Password.PASSWORD_KEYWORD
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&& (!field.title.hasPrefix(Password.UNKNOWN) || !SharedDefaults[.isHideUnknownOn])
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&& (!Password.OTP_KEYWORDS.contains(field.title) || !SharedDefaults[.isHideOTPOn])
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}
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}
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// return a key-value pair from the line
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// key might be nil, if there is no ":" in the line
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private static func getKeyValuePair(from line: String) -> (key: String?, value: String) {
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let items = line.components(separatedBy: ": ").map{String($0).trimmingCharacters(in: .whitespaces)}
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var key : String? = nil
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var value = ""
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if items.count == 1 || (items[0].isEmpty && items[1].isEmpty) {
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// no ": " found, or empty on both sides of ": "
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value = line
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// otpauth special case
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if value.hasPrefix(Password.OTPAUTH_URL_START) {
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key = Password.OTPAUTH
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}
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} else {
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if !items[0].isEmpty {
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key = items[0]
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}
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value = items[1]
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}
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return (key, value)
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}
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public func getAdditionsPlainText() -> String {
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// lines starting from the second
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let plainTextSplit = plainText.split(maxSplits: 1, omittingEmptySubsequences: false) {
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$0 == "\n" || $0 == "\r\n"
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}.map(String.init)
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return plainTextSplit.count == 1 ? "" : plainTextSplit[1]
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}
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private func getAdditionValue(withKey key: String, caseSensitive: Bool = true) -> String? {
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let searchKey = caseSensitive ? key : key.lowercased()
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let matchingField = additions.first { (caseSensitive ? $0.title : $0.title.lowercased()) == searchKey }
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return matchingField?.content
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}
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/*
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Set otpType and otpToken, if we are able to construct a valid token.
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Example of TOTP otpauth
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(Key Uri Format: https://github.com/google/google-authenticator/wiki/Key-Uri-Format)
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otpauth://totp/totp-secret?secret=AAAAAAAAAAAAAAAA&issuer=totp-secret
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Example of TOTP fields [Legacy, lower priority]
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otp_secret: secretsecretsecretsecretsecretsecret
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otp_type: totp
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otp_algorithm: sha1 (default: sha1, optional)
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otp_period: 30 (default: 30, optional)
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otp_digits: 6 (default: 6, optional)
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Example of HOTP fields [Legacy, lower priority]
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otp_secret: secretsecretsecretsecretsecretsecret
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otp_type: hotp
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otp_counter: 1
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otp_digits: 6 (default: 6, optional)
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*/
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private func updateOtpToken() {
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self.otpToken = nil
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// get otpauth, if we are able to generate a token, return
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if var otpauthString = getAdditionValue(withKey: Password.OTPAUTH) {
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if !otpauthString.hasPrefix("\(Password.OTPAUTH):") {
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otpauthString = "\(Password.OTPAUTH):\(otpauthString)"
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}
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if let otpauthUrl = URL(string: otpauthString),
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let token = Token(url: otpauthUrl) {
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self.otpToken = token
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return
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}
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}
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// get secret data
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guard let secretString = getAdditionValue(withKey: "otp_secret"),
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let secretData = MF_Base32Codec.data(fromBase32String: secretString),
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!secretData.isEmpty else {
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// print("Missing / Invalid otp secret")
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return
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}
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// get type
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guard let type = getAdditionValue(withKey: "otp_type")?.lowercased(),
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(type == "totp" || type == "hotp") else {
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// print("Missing / Invalid otp type")
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return
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}
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// get algorithm (optional)
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var algorithm = Generator.Algorithm.sha1
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if let algoString = getAdditionValue(withKey: "otp_algorithm") {
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switch algoString.lowercased() {
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case "sha256":
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algorithm = .sha256
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case "sha512":
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algorithm = .sha512
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default:
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algorithm = .sha1
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}
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}
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// construct the token
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if type == "totp" {
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// HOTP
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// default: 6 digits, 30 seconds
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guard let digits = Int(getAdditionValue(withKey: "otp_digits") ?? "6"),
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let period = Double(getAdditionValue(withKey: "otp_period") ?? "30.0") else {
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let alertMessage = "Invalid otp_digits or otp_period."
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print(alertMessage)
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return
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}
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guard let generator = Generator(
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factor: .timer(period: period),
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secret: secretData,
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algorithm: algorithm,
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digits: digits) else {
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let alertMessage = "Invalid OTP generator parameters."
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print(alertMessage)
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return
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}
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self.otpToken = Token(name: self.name, issuer: "", generator: generator)
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} else {
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// HOTP
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// default: 6 digits
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guard let digits = Int(getAdditionValue(withKey: "otp_digits") ?? "6"),
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let counter = UInt64(getAdditionValue(withKey: "otp_counter") ?? "") else {
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let alertMessage = "Invalid otp_digits or otp_counter."
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print(alertMessage)
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return
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}
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guard let generator = Generator(
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factor: .counter(counter),
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secret: secretData,
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algorithm: algorithm,
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digits: digits) else {
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let alertMessage = "Invalid OTP generator parameters."
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print(alertMessage)
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return
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}
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self.otpToken = Token(name: self.name, issuer: "", generator: generator)
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}
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}
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// return the description and the password strings
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public func getOtpStrings() -> (description: String, otp: String)? {
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guard let token = self.otpToken else {
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return nil
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}
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var description : String
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switch token.generator.factor {
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case .counter:
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// htop
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description = "HMAC-based"
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case .timer(let period):
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// totp
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let timeSinceEpoch = Date().timeIntervalSince1970
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let validTime = Int(period - timeSinceEpoch.truncatingRemainder(dividingBy: period))
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description = "time-based (expiring in \(validTime)s)"
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}
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let otp = self.otpToken?.currentPassword ?? "error"
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return (description, otp)
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}
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// return the password strings
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public func getOtp() -> String? {
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return self.otpToken?.currentPassword
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}
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// return the password strings
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// it is guaranteed that it is a HOTP password when we call this
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public func getNextHotp() -> String? {
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// increase the counter
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otpToken = otpToken?.updatedToken()
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// replace old HOTP settings with the new otpauth
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var newOtpauth = try! otpToken?.toURL().absoluteString
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newOtpauth?.append("&secret=")
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newOtpauth?.append(MF_Base32Codec.base32String(from: otpToken?.generator.secret))
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var lines : [String] = []
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self.plainText.enumerateLines() { line, _ in
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let (key, _) = Password.getKeyValuePair(from: line)
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if !Password.OTP_KEYWORDS.contains(key ?? "") {
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lines.append(line)
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} else if key == Password.OTPAUTH && newOtpauth != nil {
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lines.append(newOtpauth!)
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// set to nil to prevent duplication
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newOtpauth = nil
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}
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}
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if newOtpauth != nil {
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lines.append(newOtpauth!)
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}
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self.updatePassword(name: self.name, url: self.url, plainText: lines.joined(separator: "\n"))
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// get and return the password
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return self.otpToken?.currentPassword
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}
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public static func LooksLikeOTP(line: String) -> Bool {
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let (key, _) = getKeyValuePair(from: line)
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return Password.OTP_KEYWORDS.contains(key ?? "")
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}
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}
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