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package handlers
import (
"auth-proxy/config"
"auth-proxy/logging"
"auth-proxy/middleware"
"auth-proxy/models"
"auth-proxy/types"
"errors"
"html/template"
"net/http"
"time"
)
var templates = template.Must(template.ParseGlob("templates/*.html"))
// authenticateUser handles the core logic for authenticating a user, including brute-force protection.
// It returns the authenticated user or an error if authentication fails.
func authenticateUser(username, password, ip string) (*types.User, error) {
user, err := models.GetUserByUsername(username)
if err != nil {
logging.AppLog.Error("Database error during authentication", "error", err, "username", username, "ip", ip)
return nil, errors.New("internal server error")
}
if user == nil {
logging.SecurityLog.Warn("AUTH FAIL", "username", username, "ip", ip, "reason", "user not found")
return nil, errors.New("invalid username or password")
}
// Step 1: Check if the account is locked.
if !user.IsActive {
lockoutDuration := time.Duration(config.Paths.LockoutDurationMinutes) * time.Minute
// Check if the lockout period has expired.
if time.Since(user.UpdatedAt) < lockoutDuration {
logging.SecurityLog.Warn("AUTH FAIL", "username", username, "ip", ip, "reason", "account locked")
return nil, errors.New("account is temporarily locked")
} else {
// Lockout has expired. Reactivate the account but do not log the user in on this attempt.
if err := models.SetUserActiveStatus(user.ID, true); err != nil {
logging.AppLog.Error("Failed to reactivate user", "error", err, "user_id", user.ID, "ip", ip)
return nil, errors.New("internal server error")
}
if err := models.RecordLoginSuccess(user.ID); err != nil {
logging.AppLog.Error("Failed to reset failed login attempts on reactivation", "error", err, "user_id", user.ID, "ip", ip)
}
logging.SecurityLog.Info("ACCOUNT UNLOCKED", "username", username, "ip", ip)
return nil, errors.New("account has been unlocked, please try again")
}
}
// Step 2: If the account is active, validate credentials against PocketBase.
if _, err := models.AuthenticateWithPassword(username, password); err != nil {
// Record the failure
if err := models.RecordLoginFailure(user.ID); err != nil {
logging.AppLog.Error("Failed to record login failure", "error", err, "user_id", user.ID, "ip", ip)
}
// Re-fetch user to get updated failed_logins count
updatedUser, _ := models.GetUserByID(user.ID)
maxAttempts := config.Paths.MaxLoginAttempts
// Lock the account if max attempts are exceeded
if updatedUser != nil && maxAttempts > 0 && updatedUser.FailedLogins >= maxAttempts {
if err := models.SetUserActiveStatus(user.ID, false); err != nil {
logging.AppLog.Error("Failed to lock account", "error", err, "user_id", user.ID, "ip", ip)
}
logging.SecurityLog.Warn("ACCOUNT LOCKED", "username", username, "ip", ip)
}
logging.SecurityLog.Warn("AUTH FAIL", "username", username, "ip", ip, "reason", "invalid credentials")
return nil, errors.New("invalid username or password")
}
// Step 3: Login successful.
if err := models.RecordLoginSuccess(user.ID); err != nil {
logging.AppLog.Error("Failed to record login success", "error", err, "user_id", user.ID, "ip", ip)
}
if refreshedUser, refreshErr := models.GetUserByID(user.ID); refreshErr == nil && refreshedUser != nil {
user = refreshedUser
}
logging.SecurityLog.Info("AUTH SUCCESS", "username", user.Username, "ip", ip)
return user, nil
}
func renderLoginWithError(w http.ResponseWriter, r *http.Request, message string) {
data := map[string]interface{}{
"Paths": config.Paths,
"Error": message,
"RegisterEnabled": config.Paths.RegisterEnabled,
"XSRFToken": middleware.GetXSRFToken(r),
}
w.WriteHeader(http.StatusUnauthorized) // Set status to indicate failure
if err := templates.ExecuteTemplate(w, "login.html", data); err != nil {
logging.AppLog.Error("Failed to execute login template with error", "error", err)
}
}
// LoginHandler handles displaying the login form and processing login requests.
func LoginHandler(w http.ResponseWriter, r *http.Request) {
ip := logging.GetClientIP(r)
// If user is already logged in, redirect to account page
cookie, err := r.Cookie("auth_token")
if err == nil {
user, _ := models.GetUserByToken(cookie.Value)
if user != nil {
http.Redirect(w, r, config.Paths.Account, http.StatusFound)
return
}
}
if r.Method == http.MethodGet {
data := map[string]interface{}{
"Paths": config.Paths,
"RegisterEnabled": config.Paths.RegisterEnabled,
"XSRFToken": middleware.GetXSRFToken(r),
}
if err := templates.ExecuteTemplate(w, "login.html", data); err != nil {
logging.AppLog.Error("Failed to execute login template", "error", err, "ip", ip)
}
return
}
if r.Method == http.MethodPost {
if err := r.ParseForm(); err != nil {
logging.AppLog.Error("Failed to parse login form", "error", err, "ip", ip)
renderLoginWithError(w, r, "An internal error occurred. Please try again.")
return
}
username := r.FormValue("username")
password := r.FormValue("password")
user, err := authenticateUser(username, password, ip)
if err != nil {
// Map authentication error to user-facing message
errMsg := "Invalid username or password."
if err.Error() == "account is temporarily locked" {
errMsg = "Account is temporarily locked."
} else if err.Error() == "internal server error" {
errMsg = "An internal error occurred. Please try again."
} else if err.Error() == "account has been unlocked, please try again" {
errMsg = "Account has been unlocked. Please try logging in again."
}
renderLoginWithError(w, r, errMsg)
return
}
// --- Create Session Cookie ---
duration := time.Duration(config.Paths.TokenDurationHours) * time.Hour
token, err := models.CreateAuthToken(user, duration)
if err != nil {
logging.AppLog.Error("Failed to create auth token", "error", err, "username", user.Username, "ip", ip)
renderLoginWithError(w, r, "Could not create session.")
return
}
http.SetCookie(w, &http.Cookie{
Name: "auth_token",
Value: token.Token,
Expires: token.ExpiresAt,
Path: "/",
HttpOnly: true,
Secure: r.TLS != nil, // Use Secure flag if on HTTPS
SameSite: http.SameSiteLaxMode,
})
// Redirect to the root path, which is the proxied application.
http.Redirect(w, r, "/", http.StatusFound)
return
}
w.WriteHeader(http.StatusMethodNotAllowed)
}
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