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Merge pull request #29 from kloeckner-i/METAL-1957-switch-to-password…
…-generator-library [METAL-1957] Switch To Password Generator Library
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,134 +1,47 @@ | ||
| package kci | ||
|
|
||
| import ( | ||
| "crypto/rand" | ||
| "errors" | ||
| "fmt" | ||
| "math/big" | ||
| "regexp" | ||
|
|
||
| "github.com/kloeckner-i/can-haz-password/password" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| const ( | ||
| mininumLength = 8 | ||
| digits = "0123456789" | ||
| specials = "-_" // include only uri safe special charactors | ||
| uppers = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | ||
| lowers = "abcdefghijklmnopqrstuvwxyz" | ||
| ) | ||
|
|
||
| // GeneratePass generates secure password string | ||
| func GeneratePass() string { | ||
| password, err := generatePass(10, 8, 2, true) | ||
| generator := password.NewGenerator(newDbPasswordRule()) | ||
| password, err := generator.Generate() | ||
| if err != nil { | ||
| logrus.Fatalf("can not generate password - %s", err) | ||
| } | ||
| return password | ||
| } | ||
|
|
||
| func generatePass(numLetters, numDigits, numSpecials int, mixCase bool) (string, error) { | ||
| length := numLetters + numDigits + numSpecials | ||
|
|
||
| if length < mininumLength { | ||
| return "", fmt.Errorf("total length of the password should be at least bigger than %d", mininumLength) | ||
| } | ||
|
|
||
| if mixCase && (numLetters < 2) { | ||
| return "", errors.New("can not mix case when the length of letters is smaller than 2") | ||
| } | ||
|
|
||
| var bufAll []rune | ||
|
|
||
| if numDigits != 0 { | ||
| bufDigits, err := selectRandomCharacters(digits, numDigits) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to select digits for password: %v", err) | ||
| } | ||
| bufAll = append(bufAll, bufDigits...) | ||
| } | ||
|
|
||
| if numSpecials != 0 { | ||
| bufSpecials, err := selectRandomCharacters(specials, numSpecials) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to select special characters for password: %v", err) | ||
| } | ||
| bufAll = append(bufAll, bufSpecials...) | ||
| } | ||
|
|
||
| minNumUppers := int64(0) | ||
| maxNumUppers := int64(numLetters) | ||
| if mixCase { | ||
| minNumUppers = 1 | ||
| maxNumUppers = maxNumUppers - 1 | ||
| } | ||
|
|
||
| numUppers, err := secureRandomIntWithinRange(minNumUppers, maxNumUppers) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| if numUppers != 0 { | ||
| bufUppers, err := selectRandomCharacters(uppers, int(numUppers)) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to select uppercase letters for password: %v", err) | ||
| } | ||
| bufAll = append(bufAll, bufUppers...) | ||
| } | ||
|
|
||
| numLowers := numLetters - int(numUppers) | ||
| if numLowers != 0 { | ||
| bufLowers, err := selectRandomCharacters(lowers, numLowers) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to select lowercase letters for password: %v", err) | ||
| } | ||
| bufAll = append(bufAll, bufLowers...) | ||
| } | ||
|
|
||
| password, err := secureShuffle(string(bufAll)) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to shuffle password: %v", err) | ||
| } | ||
|
|
||
| return password, nil | ||
| // Minimum length of 20 characters, maximum length of 30 characters. | ||
| // Varied composition including special characters and uppercase and lowercase letters. | ||
| // Excludes consecutive dashes (for hybris compatibility) and uses only url safe special characters. | ||
| type dbPasswordRule struct { | ||
| invalid *regexp.Regexp | ||
| } | ||
|
|
||
| // Select n random characters from the source string. | ||
| func selectRandomCharacters(src string, n int) ([]rune, error) { | ||
| c := []rune(src) | ||
| selection := make([]rune, n) | ||
|
|
||
| for i := 0; i < n; i++ { | ||
| r, err := secureRandomIntWithinRange(0, int64(len(c))) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| selection[i] = c[r] | ||
| func newDbPasswordRule() *dbPasswordRule { | ||
| return &dbPasswordRule{ | ||
| // Hybris does not support consecutive dashes. | ||
| invalid: regexp.MustCompile(`[-]{2,}`), | ||
| } | ||
|
|
||
| return selection, nil | ||
| } | ||
|
|
||
| // Implementation of the Fisher–Yates shuffle using crypto/rand. | ||
| func secureShuffle(src string) (string, error) { | ||
| c := []rune(src) | ||
| n := int64(len(c)) | ||
|
|
||
| for i := int64(0); i < n; i++ { | ||
| r, err := secureRandomIntWithinRange(i, n) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| c[r], c[i] = c[i], c[r] | ||
| func (r *dbPasswordRule) Config() *password.Configuration { | ||
| return &password.Configuration{ | ||
| Length: 20, | ||
| CharacterClasses: []password.CharacterClassConfiguration{ | ||
| {Characters: password.LowercaseCharacters + password.UppercaseCharacters, Minimum: 10}, | ||
| {Characters: password.DigitCharacters, Minimum: 8}, | ||
| {Characters: password.URLSafeSpecialCharacters, Minimum: 2}, | ||
| }, | ||
| } | ||
|
|
||
| return string(c), nil | ||
| } | ||
|
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||
| // Generate a secure random integer within the range min <= x < max. | ||
| func secureRandomIntWithinRange(min int64, max int64) (int64, error) { | ||
| next, err := rand.Int(rand.Reader, new(big.Int).SetInt64(max-min)) | ||
| if err != nil { | ||
| return -1, err | ||
| } | ||
| return min + next.Int64(), nil | ||
| func (r *dbPasswordRule) Valid(password []rune) bool { | ||
| return !r.invalid.MatchString(string(password)) | ||
| } |
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