78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
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package auth
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import (
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"fmt"
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"log/slog"
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"net/http"
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"os"
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"strings"
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"time"
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"git.a71.su/Andrew71/hibiscus-txt/internal/config"
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"git.a71.su/Andrew71/hibiscus-txt/internal/lang"
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)
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type failedLogin struct {
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Username string
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Password string
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Timestamp time.Time
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}
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var failedLogins []failedLogin
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// noteLoginFail attempts to log and counteract brute-force attacks.
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func noteLoginFail(username string, password string, r *http.Request) {
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slog.Warn("failed auth", "username", username, "password", password, "address", r.RemoteAddr)
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notifyTelegram(fmt.Sprintf(lang.Translate("info.telegram.auth_fail")+":\nusername=%s\npassword=%s\nremote=%s", username, password, r.RemoteAddr))
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attempt := failedLogin{username, password, time.Now()}
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updatedLogins := []failedLogin{attempt}
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for _, attempt := range failedLogins {
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if 100 > time.Since(attempt.Timestamp).Seconds() {
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updatedLogins = append(updatedLogins, attempt)
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}
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}
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failedLogins = updatedLogins
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// At least 3 failed attempts in last 100 seconds -> likely brute-force
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if len(failedLogins) >= 3 && config.Cfg.Scram {
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scram()
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}
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}
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// notifyTelegram attempts to send a message to the user through Telegram.
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func notifyTelegram(msg string) {
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if config.Cfg.TelegramChat == "" || config.Cfg.TelegramToken == "" {
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slog.Debug("ignoring telegram request due to lack of credentials")
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return
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}
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client := &http.Client{}
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data := "chat_id=" + config.Cfg.TelegramChat + "&text=" + msg
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if config.Cfg.TelegramTopic != "" {
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data += "&message_thread_id=" + config.Cfg.TelegramTopic
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}
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req, err := http.NewRequest("POST", "https://api.telegram.org/bot"+config.Cfg.TelegramToken+"/sendMessage", strings.NewReader(data))
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if err != nil {
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slog.Error("failed telegram request", "error", err)
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return
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}
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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resp, err := client.Do(req)
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if err != nil {
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slog.Error("failed telegram request", "error", err)
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return
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}
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if resp.StatusCode != 200 {
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slog.Error("failed telegram request", "status", resp.Status)
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}
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}
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// scram shuts down the service, useful in case of suspected attack.
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func scram() {
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slog.Warn("SCRAM triggered, shutting down")
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notifyTelegram(lang.Translate("info.telegram.scram"))
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os.Exit(0)
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}
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