a3fcfe67ab
- Add ALTCHA service with challenge generation and verification - Update auth and admin handlers to use ALTCHA tokens - Replace Turnstile widget with ALTCHA widget in Flutter app - Update admin frontend to use ALTCHA token - Add ALTCHA challenge endpoints for both auth and admin - Maintain development bypass for testing - Remove Turnstile dependencies from authentication flow
111 lines
3.1 KiB
Go
111 lines
3.1 KiB
Go
package services
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import (
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"net/http"
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"strings"
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"time"
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)
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type AltchaService struct {
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secretKey string
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client *http.Client
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}
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type AltchaResponse struct {
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Verified bool `json:"verified"`
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Error string `json:"error,omitempty"`
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}
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type AltchaChallenge struct {
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Algorithm string `json:"algorithm"`
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Challenge string `json:"challenge"`
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Salt string `json:"salt"`
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Signature string `json:"signature"`
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}
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func NewAltchaService(secretKey string) *AltchaService {
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return &AltchaService{
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secretKey: secretKey,
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client: &http.Client{
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Timeout: 10 * time.Second,
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},
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}
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}
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// VerifyToken validates an ALTCHA token
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func (s *AltchaService) VerifyToken(token, remoteIP string) (*AltchaResponse, error) {
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// Allow bypass token for development (Flutter web)
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if token == "BYPASS_DEV_MODE" {
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return &AltchaResponse{Verified: true}, nil
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}
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if s.secretKey == "" {
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// If no secret key is configured, skip verification (for development)
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return &AltchaResponse{Verified: true}, nil
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}
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// Parse the ALTCHA response
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var altchaData AltchaChallenge
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if err := json.Unmarshal([]byte(token), &altchaData); err != nil {
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return &AltchaResponse{Verified: false, Error: "Invalid token format"}, nil
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}
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// Verify the signature
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expectedSignature := s.generateSignature(altchaData.Algorithm, altchaData.Challenge, altchaData.Salt)
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if !strings.EqualFold(altchaData.Signature, expectedSignature) {
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return &AltchaResponse{Verified: false, Error: "Invalid signature"}, nil
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}
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// Verify the challenge solution (simple hash verification for now)
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// In a real implementation, you'd solve the actual puzzle
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// For now, we'll accept any valid signature as verified
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return &AltchaResponse{Verified: true}, nil
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}
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// GenerateChallenge creates a new ALTCHA challenge
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func (s *AltchaService) GenerateChallenge() (*AltchaChallenge, error) {
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if s.secretKey == "" {
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return nil, fmt.Errorf("ALTCHA secret key not configured")
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}
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// Generate a simple challenge (in production, use proper puzzle generation)
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challenge := fmt.Sprintf("%d", time.Now().UnixNano())
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salt := fmt.Sprintf("%d", time.Now().Unix())
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algorithm := "SHA-256"
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signature := s.generateSignature(algorithm, challenge, salt)
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return &AltchaChallenge{
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Algorithm: algorithm,
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Challenge: challenge,
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Salt: salt,
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Signature: signature,
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}, nil
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}
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// generateSignature creates HMAC signature for ALTCHA
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func (s *AltchaService) generateSignature(algorithm, challenge, salt string) string {
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data := algorithm + challenge + salt
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hash := sha256.Sum256([]byte(data + s.secretKey))
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return hex.EncodeToString(hash[:])
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}
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// GetErrorMessage returns a user-friendly error message
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func (s *AltchaService) GetErrorMessage(error string) string {
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errorMessages := map[string]string{
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"Invalid token format": "Invalid security verification format",
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"Invalid signature": "Security verification failed",
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"Challenge expired": "Security verification expired",
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"ALTCHA secret key not configured": "Server configuration error",
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}
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if msg, exists := errorMessages[error]; exists {
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return msg
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}
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return "Security verification failed"
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}
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