func newPwd()

in google_guest_agent/windows_accounts.go [53:99]

• 43 lines of code
• 11 McCabe index (conditional complexity)

func newPwd(userPwLgth int) (string, error) {
	var pwLgth int
	minPwLgth := 15
	maxPwLgth := 255
	lower := []byte("abcdefghijklmnopqrstuvwxyz")
	upper := []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
	numbers := []byte("0123456789")
	special := []byte(`~!@#$%^&*_-+=|\(){}[]:;<>,.?/`)
	chars := bytes.Join([][]byte{lower, upper, numbers, special}, nil)
	pwLgth = minPwLgth
	if userPwLgth > minPwLgth {
		pwLgth = userPwLgth
	}
	if userPwLgth > maxPwLgth {
		pwLgth = maxPwLgth
	}

	for {
		b := make([]byte, pwLgth)
		for i := range b {
			ci, err := rand.Int(rand.Reader, big.NewInt(int64(len(chars))))
			if err != nil {
				return "", err
			}
			b[i] = chars[ci.Int64()]
		}

		var l, u, n, s int
		if bytes.ContainsAny(lower, string(b)) {
			l = 1
		}
		if bytes.ContainsAny(upper, string(b)) {
			u = 1
		}
		if bytes.ContainsAny(numbers, string(b)) {
			n = 1
		}
		if bytes.ContainsAny(special, string(b)) {
			s = 1
		}
		// If the password does not meet Windows complexity requirements, try again.
		// https://technet.microsoft.com/en-us/library/cc786468
		if l+u+n+s >= 3 {
			return string(b), nil
		}
	}
}