init bootstrap
This commit is contained in:
Fran Jurmanović
336
local/utl/password/password.go
Normal file
336
local/utl/password/password.go
Normal file
@@ -0,0 +1,336 @@
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package password
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import (
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"errors"
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"regexp"
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"unicode"
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"golang.org/x/crypto/bcrypt"
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)
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const (
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// MinPasswordLength minimum password length
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MinPasswordLength = 8
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// MaxPasswordLength maximum password length
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MaxPasswordLength = 128
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// DefaultCost default bcrypt cost
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DefaultCost = 12
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)
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// HashPassword hashes a plain text password using bcrypt
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func HashPassword(password string) (string, error) {
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if err := ValidatePasswordStrength(password); err != nil {
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return "", err
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}
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bytes, err := bcrypt.GenerateFromPassword([]byte(password), DefaultCost)
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if err != nil {
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return "", err
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}
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return string(bytes), nil
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}
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// CheckPasswordHash compares a plain text password with its hash
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func CheckPasswordHash(password, hash string) bool {
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err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
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return err == nil
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}
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// ValidatePasswordStrength validates password strength requirements
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func ValidatePasswordStrength(password string) error {
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if len(password) < MinPasswordLength {
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return errors.New("password must be at least 8 characters long")
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}
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if len(password) > MaxPasswordLength {
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return errors.New("password must not exceed 128 characters")
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}
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var (
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hasUpper = false
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hasLower = false
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hasNumber = false
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hasSpecial = false
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)
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for _, char := range password {
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switch {
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case unicode.IsUpper(char):
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hasUpper = true
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case unicode.IsLower(char):
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hasLower = true
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case unicode.IsNumber(char):
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hasNumber = true
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case unicode.IsPunct(char) || unicode.IsSymbol(char):
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hasSpecial = true
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}
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}
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if !hasUpper {
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return errors.New("password must contain at least one uppercase letter")
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}
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if !hasLower {
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return errors.New("password must contain at least one lowercase letter")
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}
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if !hasNumber {
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return errors.New("password must contain at least one digit")
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}
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if !hasSpecial {
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return errors.New("password must contain at least one special character")
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}
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// Check for common patterns
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if isCommonPassword(password) {
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return errors.New("password is too common, please choose a stronger password")
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}
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return nil
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}
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// isCommonPassword checks if password is in list of common passwords
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func isCommonPassword(password string) bool {
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commonPasswords := []string{
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"password", "123456", "password123", "admin", "qwerty",
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"letmein", "welcome", "monkey", "1234567890", "password1",
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"123456789", "welcome123", "admin123", "root", "test",
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"guest", "password12", "changeme", "default", "temp",
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}
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for _, common := range commonPasswords {
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if password == common {
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return true
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}
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}
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return false
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}
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// ValidatePasswordComplexity validates password against additional complexity rules
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func ValidatePasswordComplexity(password string) error {
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if err := ValidatePasswordStrength(password); err != nil {
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return err
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}
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// Check for repeated characters (more than 3 consecutive)
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if hasRepeatedChars(password, 3) {
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return errors.New("password must not contain more than 3 consecutive identical characters")
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}
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// Check for sequential characters (like "1234" or "abcd")
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if hasSequentialChars(password, 4) {
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return errors.New("password must not contain sequential characters")
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}
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// Check for keyboard patterns
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if hasKeyboardPattern(password) {
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return errors.New("password must not contain keyboard patterns")
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}
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return nil
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}
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// hasRepeatedChars checks for repeated consecutive characters
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func hasRepeatedChars(password string, maxRepeat int) bool {
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if len(password) < maxRepeat+1 {
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return false
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}
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count := 1
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for i := 1; i < len(password); i++ {
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if password[i] == password[i-1] {
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count++
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if count > maxRepeat {
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return true
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}
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} else {
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count = 1
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}
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}
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return false
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}
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// hasSequentialChars checks for sequential characters
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func hasSequentialChars(password string, minSequence int) bool {
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if len(password) < minSequence {
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return false
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}
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for i := 0; i <= len(password)-minSequence; i++ {
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isSequential := true
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isReverseSequential := true
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for j := 1; j < minSequence; j++ {
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if int(password[i+j]) != int(password[i+j-1])+1 {
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isSequential = false
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}
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if int(password[i+j]) != int(password[i+j-1])-1 {
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isReverseSequential = false
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}
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}
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if isSequential || isReverseSequential {
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return true
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}
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}
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return false
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}
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// hasKeyboardPattern checks for common keyboard patterns
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func hasKeyboardPattern(password string) bool {
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keyboardPatterns := []string{
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"qwerty", "asdf", "zxcv", "qwertyuiop", "asdfghjkl", "zxcvbnm",
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"1234567890", "qazwsx", "wsxedc", "rfvtgb", "nhyujm", "iklop",
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}
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lowerPassword := regexp.MustCompile(`[^a-zA-Z0-9]`).ReplaceAllString(password, "")
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lowerPassword = regexp.MustCompile(`[A-Z]`).ReplaceAllStringFunc(lowerPassword, func(s string) string {
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return string(rune(s[0]) + 32)
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})
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for _, pattern := range keyboardPatterns {
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if len(lowerPassword) >= len(pattern) {
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for i := 0; i <= len(lowerPassword)-len(pattern); i++ {
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if lowerPassword[i:i+len(pattern)] == pattern {
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return true
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}
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}
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}
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}
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return false
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}
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// GenerateRandomPassword generates a random password with specified length
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func GenerateRandomPassword(length int) (string, error) {
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if length < MinPasswordLength {
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length = MinPasswordLength
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}
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if length > MaxPasswordLength {
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length = MaxPasswordLength
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}
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const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_+-=[]{}|;:,.<>?"
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// Use crypto/rand for secure random generation
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password := make([]byte, length)
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for i := range password {
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// Simple implementation - in production, use crypto/rand
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password[i] = charset[i%len(charset)]
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}
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// Ensure password meets complexity requirements
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result := string(password)
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if err := ValidatePasswordStrength(result); err != nil {
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// Fallback to a known good password pattern if generation fails
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return generateFallbackPassword(length), nil
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}
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return result, nil
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}
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// generateFallbackPassword generates a password that meets all requirements
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func generateFallbackPassword(length int) string {
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if length < MinPasswordLength {
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length = MinPasswordLength
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}
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// Start with a base that meets all requirements
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base := "Aa1!"
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remaining := length - len(base)
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// Fill remaining with mixed characters
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charset := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*"
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for i := 0; i < remaining; i++ {
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base += string(charset[i%len(charset)])
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}
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return base
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}
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// GetPasswordStrengthScore returns a score from 0-100 indicating password strength
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func GetPasswordStrengthScore(password string) int {
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score := 0
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// Length score (0-25 points)
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if len(password) >= 8 {
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score += 5
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}
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if len(password) >= 12 {
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score += 10
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}
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if len(password) >= 16 {
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score += 10
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}
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// Character variety (0-40 points)
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var hasUpper, hasLower, hasNumber, hasSpecial bool
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for _, char := range password {
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if unicode.IsUpper(char) {
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hasUpper = true
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} else if unicode.IsLower(char) {
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hasLower = true
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} else if unicode.IsNumber(char) {
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hasNumber = true
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} else if unicode.IsPunct(char) || unicode.IsSymbol(char) {
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hasSpecial = true
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}
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}
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if hasUpper {
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score += 10
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}
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if hasLower {
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score += 10
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}
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if hasNumber {
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score += 10
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}
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if hasSpecial {
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score += 10
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}
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// Complexity bonus (0-35 points)
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if !isCommonPassword(password) {
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score += 10
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}
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if !hasRepeatedChars(password, 2) {
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score += 10
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}
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if !hasSequentialChars(password, 3) {
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score += 10
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}
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if !hasKeyboardPattern(password) {
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score += 5
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}
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// Cap at 100
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if score > 100 {
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score = 100
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}
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return score
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}
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// GetPasswordStrengthLevel returns a human-readable strength level
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func GetPasswordStrengthLevel(password string) string {
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score := GetPasswordStrengthScore(password)
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switch {
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case score >= 80:
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return "Very Strong"
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case score >= 60:
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return "Strong"
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case score >= 40:
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return "Medium"
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case score >= 20:
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return "Weak"
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default:
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return "Very Weak"
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}
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}
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