mirror of
https://github.com/1f349/lavender.git
synced 2024-12-22 23:54:10 +00:00
86 lines
2.0 KiB
Go
86 lines
2.0 KiB
Go
package auth
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import (
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"context"
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"errors"
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"github.com/1f349/lavender/database"
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"github.com/xlzd/gotp"
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"net/http"
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"time"
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)
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func isDigitsSupported(digits int64) bool {
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return digits >= 6 && digits <= 8
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}
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type otpLoginDB interface {
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GetOtp(ctx context.Context, subject string) (database.GetOtpRow, error)
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}
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var _ Provider = (*OtpLogin)(nil)
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type OtpLogin struct {
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DB otpLoginDB
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}
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func (o *OtpLogin) Factor() Factor { return FactorSecond }
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func (o *OtpLogin) Name() string { return "basic" }
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func (o *OtpLogin) RenderData(_ context.Context, _ *http.Request, user *database.User, data map[string]any) error {
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if user == nil || user.Subject == "" {
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return ErrRequiresPreviousFactor
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}
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if user.OtpSecret == "" || !isDigitsSupported(user.OtpDigits) {
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return ErrUserDoesNotSupportFactor
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}
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// no need to provide render data
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return nil
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}
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func (o *OtpLogin) AttemptLogin(ctx context.Context, req *http.Request, user *database.User) error {
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if user == nil || user.Subject == "" {
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return ErrRequiresPreviousFactor
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}
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if user.OtpSecret == "" || !isDigitsSupported(user.OtpDigits) {
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return ErrUserDoesNotSupportFactor
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}
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code := req.FormValue("code")
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if !validateTotp(user.OtpSecret, int(user.OtpDigits), code) {
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return BasicUserSafeError(http.StatusBadRequest, "invalid OTP code")
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}
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return nil
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}
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var ErrInvalidOtpCode = errors.New("invalid OTP code")
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func (o *OtpLogin) VerifyOtpCode(ctx context.Context, subject, code string) error {
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otp, err := o.DB.GetOtp(ctx, subject)
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if err != nil {
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return err
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}
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if !validateTotp(otp.OtpSecret, int(otp.OtpDigits), code) {
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return ErrInvalidOtpCode
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}
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return nil
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}
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func validateTotp(secret string, digits int, code string) bool {
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totp := gotp.NewTOTP(secret, int(digits), 30, nil)
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return verifyTotp(totp, code)
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}
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func verifyTotp(totp *gotp.TOTP, code string) bool {
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t := time.Now()
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if totp.VerifyTime(code, t) {
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return true
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}
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if totp.VerifyTime(code, t.Add(-30*time.Second)) {
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return true
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}
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return totp.VerifyTime(code, t.Add(30*time.Second))
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}
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