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password generation service

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This commit is contained in:
Kyle Spearrin 2019-04-17 15:23:26 -04:00
parent 818414eb37
commit f46151bb71
5 changed files with 8200 additions and 0 deletions
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18
src/Core/Abstractions/IPasswordGenerationService.cs Normal file
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using System.Collections.Generic;
using System.Threading.Tasks;
using Bit.Core.Models.Domain;
namespace Bit.Core.Abstractions
{
public interface IPasswordGenerationService
{
Task AddHistoryAsync(string password);
Task ClearAsync();
Task<string> GeneratePassphraseAsync(PasswordGenerationOptions options);
Task<string> GeneratePasswordAsync(PasswordGenerationOptions options);
Task<List<GeneratedPasswordHistory>> GetHistoryAsync();
Task<PasswordGenerationOptions> GetOptionsAsync();
Task<object> PasswordStrength(string password, List<string> userInputs = null);
Task SaveOptionsAsync(PasswordGenerationOptions options);
}
}

10
src/Core/Models/Domain/GeneratedPasswordHistory.cs Normal file
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using System;
namespace Bit.Core.Models.Domain
{
public class GeneratedPasswordHistory
{
public string Password { get; set; }
public DateTime Date { get; set; }
}
}

58
src/Core/Models/Domain/PasswordGenerationOptions.cs Normal file
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namespace Bit.Core.Models.Domain
{
public class PasswordGenerationOptions
{
public PasswordGenerationOptions() { }
public PasswordGenerationOptions(bool defaultOptions)
{
if(defaultOptions)
{
Length = 14;
Ambiguous = false;
Number = true;
MinNumber = 1;
Uppercase = true;
MinUppercase = 0;
Lowercase = true;
MinLowercase = 0;
Special = false;
MinSpecial = 1;
Type = "password";
NumWords = 3;
WordSeparator = "-";
}
}
public int? Length { get; set; }
public bool? Ambiguous { get; set; }
public bool? Number { get; set; }
public int? MinNumber { get; set; }
public bool? Uppercase { get; set; }
public int? MinUppercase { get; set; }
public bool? Lowercase { get; set; }
public int? MinLowercase { get; set; }
public bool? Special { get; set; }
public int? MinSpecial { get; set; }
public string Type { get; set; }
public int? NumWords { get; set; }
public string WordSeparator { get; set; }
public void Merge(PasswordGenerationOptions defaults)
{
Length = Length ?? defaults.Length;
Ambiguous = Ambiguous ?? defaults.Ambiguous;
Number = Number ?? defaults.Number;
MinNumber = MinNumber ?? defaults.MinNumber;
Uppercase = Uppercase ?? defaults.Uppercase;
MinUppercase = MinUppercase ?? defaults.MinUppercase;
Lowercase = Lowercase ?? defaults.Lowercase;
MinLowercase = MinLowercase ?? defaults.MinLowercase;
Special = Special ?? defaults.Special;
MinSpecial = MinSpecial ?? defaults.MinSpecial;
Type = Type ?? defaults.Type;
NumWords = NumWords ?? defaults.NumWords;
WordSeparator = WordSeparator ?? defaults.WordSeparator;
}
}
}

326
src/Core/Services/PasswordGenerationService.cs Normal file
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using Bit.Core.Abstractions;
using Bit.Core.Models.Domain;
using Bit.Core.Utilities;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Bit.Core.Services
{
public class PasswordGenerationService : IPasswordGenerationService
{
private const string Keys_Options = "passwordGenerationOptions";
private const string Keys_History = "generatedPasswordHistory";
private const int MaxPasswordsInHistory = 100;
private const string LowercaseCharSet = "abcdefghijkmnopqrstuvwxyz";
private const string UppercaseCharSet = "ABCDEFGHIJKLMNPQRSTUVWXYZ";
private const string NumberCharSet = "23456789";
private const string SpecialCharSet = "!@#$%^&*";
private readonly ICryptoService _cryptoService;
private readonly IStorageService _storageService;
private readonly ICryptoFunctionService _cryptoFunctionService;
private PasswordGenerationOptions _defaultOptions = new PasswordGenerationOptions();
private PasswordGenerationOptions _optionsCache;
private List<GeneratedPasswordHistory> _history;
public PasswordGenerationService(
ICryptoService cryptoService,
IStorageService storageService,
ICryptoFunctionService cryptoFunctionService)
{
_cryptoService = cryptoService;
_storageService = storageService;
_cryptoFunctionService = cryptoFunctionService;
}
public async Task<string> GeneratePasswordAsync(PasswordGenerationOptions options)
{
// Overload defaults with given options
options.Merge(_defaultOptions);
if(options.Type == "passphrase")
{
return await GeneratePassphraseAsync(options);
}
// Sanitize
if(options.Uppercase.GetValueOrDefault() && options.MinUppercase.GetValueOrDefault() <= 0)
{
options.MinUppercase = 1;
}
if(options.Lowercase.GetValueOrDefault() && options.MinLowercase.GetValueOrDefault() <= 0)
{
options.MinLowercase = 1;
}
if(options.Number.GetValueOrDefault() && options.MinNumber.GetValueOrDefault() <= 0)
{
options.MinNumber = 1;
}
if(options.Special.GetValueOrDefault() && options.MinSpecial.GetValueOrDefault() <= 0)
{
options.MinSpecial = 1;
}
if(options.Length.GetValueOrDefault() < 1)
{
options.Length = 10;
}
var minLength = options.MinSpecial.GetValueOrDefault() + options.MinLowercase.GetValueOrDefault() +
options.MinNumber.GetValueOrDefault() + options.MinSpecial.GetValueOrDefault();
if(options.Length < minLength)
{
options.Length = minLength;
}
var positionsBuilder = new StringBuilder();
if(options.Lowercase.GetValueOrDefault() && options.MinLowercase.GetValueOrDefault() > 0)
{
for(int i = 0; i < options.MinLowercase.GetValueOrDefault(); i++)
{
positionsBuilder.Append("l");
}
}
if(options.Uppercase.GetValueOrDefault() && options.MinUppercase.GetValueOrDefault() > 0)
{
for(int i = 0; i < options.MinUppercase.GetValueOrDefault(); i++)
{
positionsBuilder.Append("u");
}
}
if(options.Number.GetValueOrDefault() && options.MinNumber.GetValueOrDefault() > 0)
{
for(int i = 0; i < options.MinNumber.GetValueOrDefault(); i++)
{
positionsBuilder.Append("n");
}
}
if(options.Special.GetValueOrDefault() && options.MinSpecial.GetValueOrDefault() > 0)
{
for(int i = 0; i < options.MinSpecial.GetValueOrDefault(); i++)
{
positionsBuilder.Append("s");
}
}
while(positionsBuilder.Length < options.Length.GetValueOrDefault())
{
positionsBuilder.Append("a");
}
// Shuffle
var positions = positionsBuilder.ToString().ToCharArray()
.OrderBy(async a => await _cryptoFunctionService.RandomNumberAsync()).ToArray();
// Build out other character sets
var allCharSet = string.Empty;
var lowercaseCharSet = LowercaseCharSet;
if(options.Ambiguous.GetValueOrDefault())
{
lowercaseCharSet = string.Concat(lowercaseCharSet, "l");
}
if(options.Lowercase.GetValueOrDefault())
{
allCharSet = string.Concat(allCharSet, lowercaseCharSet);
}
var uppercaseCharSet = UppercaseCharSet;
if(options.Ambiguous.GetValueOrDefault())
{
uppercaseCharSet = string.Concat(uppercaseCharSet, "O");
}
if(options.Uppercase.GetValueOrDefault())
{
allCharSet = string.Concat(allCharSet, uppercaseCharSet);
}
var numberCharSet = NumberCharSet;
if(options.Ambiguous.GetValueOrDefault())
{
numberCharSet = string.Concat(numberCharSet, "01");
}
if(options.Number.GetValueOrDefault())
{
allCharSet = string.Concat(allCharSet, numberCharSet);
}
var specialCharSet = SpecialCharSet;
if(options.Special.GetValueOrDefault())
{
allCharSet = string.Concat(allCharSet, specialCharSet);
}
var password = new StringBuilder();
for(var i = 0; i < options.Length.GetValueOrDefault(); i++)
{
var positionChars = string.Empty;
switch(positions[i])
{
case 'l':
positionChars = lowercaseCharSet;
break;
case 'u':
positionChars = uppercaseCharSet;
break;
case 'n':
positionChars = numberCharSet;
break;
case 's':
positionChars = specialCharSet;
break;
case 'a':
positionChars = allCharSet;
break;
}
var randomCharIndex = await _cryptoService.RandomNumberAsync(0, positionChars.Length - 1);
password.Append(positionChars[randomCharIndex]);
}
return password.ToString();
}
public async Task<string> GeneratePassphraseAsync(PasswordGenerationOptions options)
{
options.Merge(_defaultOptions);
if(options.NumWords.GetValueOrDefault() <= 2)
{
options.NumWords = _defaultOptions.NumWords;
}
if(options.WordSeparator == null || options.WordSeparator.Length == 0 || options.WordSeparator.Length > 1)
{
options.WordSeparator = " ";
}
var listLength = WordList.EEFLongWordList.Count - 1;
var wordList = new List<string>();
for(int i = 0; i < options.NumWords.GetValueOrDefault(); i++)
{
var wordIndex = await _cryptoService.RandomNumberAsync(0, listLength);
wordList.Add(WordList.EEFLongWordList[wordIndex]);
}
return string.Join(options.WordSeparator, wordList);
}
public async Task<PasswordGenerationOptions> GetOptionsAsync()
{
if(_optionsCache == null)
{
var options = await _storageService.GetAsync<PasswordGenerationOptions>(Keys_Options);
if(options == null)
{
_optionsCache = _defaultOptions;
}
else
{
options.Merge(_defaultOptions);
_optionsCache = options;
}
}
return _optionsCache;
}
public async Task SaveOptionsAsync(PasswordGenerationOptions options)
{
await _storageService.SaveAsync(Keys_Options, options);
_optionsCache = options;
}
public async Task<List<GeneratedPasswordHistory>> GetHistoryAsync()
{
var hasKey = await _cryptoService.HasKeyAsync();
if(!hasKey)
{
return new List<GeneratedPasswordHistory>();
}
if(_history == null)
{
var encrypted = await _storageService.GetAsync<List<GeneratedPasswordHistory>>(Keys_History);
_history = await DecryptHistoryAsync(encrypted);
}
return _history ?? new List<GeneratedPasswordHistory>();
}
public async Task AddHistoryAsync(string password)
{
var hasKey = await _cryptoService.HasKeyAsync();
if(!hasKey)
{
return;
}
var currentHistory = await GetHistoryAsync();
// Prevent duplicates
if(MatchesPrevious(password, currentHistory))
{
return;
}
// Remove old items.
if(currentHistory.Count > MaxPasswordsInHistory)
{
currentHistory.RemoveAt(currentHistory.Count - 1);
}
var newHistory = await EncryptHistoryAsync(currentHistory);
await _storageService.SaveAsync(Keys_History, newHistory);
}
public async Task ClearAsync()
{
_history = new List<GeneratedPasswordHistory>();
await _storageService.RemoveAsync(Keys_History);
}
public Task<object> PasswordStrength(string password, List<string> userInputs = null)
{
throw new NotImplementedException();
}
// Helpers
private async Task<List<GeneratedPasswordHistory>> EncryptHistoryAsync(List<GeneratedPasswordHistory> history)
{
if(!history?.Any() ?? true)
{
return new List<GeneratedPasswordHistory>();
}
var tasks = history.Select(async item =>
{
var encrypted = await _cryptoService.EncryptAsync(item.Password);
return new GeneratedPasswordHistory
{
Password = encrypted.EncryptedString,
Date = item.Date
};
});
var h = await Task.WhenAll(tasks);
return h.ToList();
}
private async Task<List<GeneratedPasswordHistory>> DecryptHistoryAsync(List<GeneratedPasswordHistory> history)
{
if(!history?.Any() ?? true)
{
return new List<GeneratedPasswordHistory>();
}
var tasks = history.Select(async item =>
{
var decrypted = await _cryptoService.DecryptToUtf8Async(new CipherString(item.Password));
return new GeneratedPasswordHistory
{
Password = decrypted,
Date = item.Date
};
});
var h = await Task.WhenAll(tasks);
return h.ToList();
}
private bool MatchesPrevious(string password, List<GeneratedPasswordHistory> history)
{
if(!history?.Any() ?? true)
{
return false;
}
return history.Last().Password == password;
}
}
}

7788
src/Core/Utilities/WordList.cs Normal file
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