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Django does not throttle authentication requests by default, and adding django-otp alone does not secure every OTP login flow. Avoid four implementation mistakes: assuming Django supplies rate limits, accepting a time-based code more than once, leaving verification unthrottled, and testing one submitted code against every enrolled device.
These are four important implementation pitfalls, not a measured claim about how often tutorials get them wrong. Package behavior below refers to the stable django-otp 1.7.3 documentation; check the version and code actually deployed in your project.
1. Assuming Django throttles authentication attempts
Django’s security guidance is explicit: “Django does not throttle requests to authenticate users.” The framework’s standard authentication flow should not be treated as a brute-force defense. Django suggests using a plugin or web-server module to protect against brute-force attacks. Django: Security in Django
That matters for OTP because a second-factor form is another authentication endpoint. A limit on password attempts does not automatically establish a limit on OTP attempts, especially if your project implements a custom view or API route.
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- Identify every route that verifies an OTP, including browser login, API, recovery, and any custom authentication flow.
- Confirm an effective rate limit applies to each route and that it cannot be bypassed by switching endpoints.
- Verify the deployed Django version’s security guidance and the actual behavior of your login views; the cited Django page is for version 4.2.
2. Accepting the same TOTP more than once—or widening the time window without reason
Time-based one-time passwords (TOTP) are derived from a shared secret and a time step. A code may remain mathematically valid for a short interval, but a verifier should not allow the same time-based OTP to authenticate repeatedly during its validity period. NIST SP 800-63B-4 requires one-time acceptance for replay resistance and says the TOTP lifetime should account for expected authenticator clock drift, network delay, and the time a person needs to enter the code. NIST SP 800-63B-4: Authentication and Authenticator Management
What django-otp documents
In django-otp 1.7.3, TOTPDevice tracks the last successfully verified time step in last_t. After success, a subsequent verification must use a higher step, which prevents reuse of that already accepted step when verification goes through the device method. Its documented defaults are a 30-second step, six digits, and tolerance of one step; tolerance one permits the current, previous, and next time steps.
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How to choose tolerance
Do not enlarge the accepted window just to make occasional failed logins disappear. A larger tolerance accepts codes for more time steps, which can make a captured code usable over a wider interval. Choose a limited drift allowance based on the devices and conditions your service supports, and account for network and entry delay as NIST advises. Check custom verification code carefully: bypassing the device’s verification method may also bypass its replay tracking. django-otp 1.7.3 documentation: Overview
3. Leaving OTP verification effectively unthrottled
Django’s general authentication behavior does not provide request throttling, so your OTP path needs an effective attempt limit of its own. NIST calls for rate limiting OTP authentication attempts under the standard’s requirements; that is implementation guidance, not a claim that every application or product is formally NIST-compliant.
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Use and verify device-level throttling
django-otp documents exponential back-off for OTP devices. Its delay is based on the device’s throttle factor, and a factor of zero disables throttling. This protection is useful only when the deployed verification flow actually invokes the relevant device behavior and the configuration has not disabled it.
- Inspect the installed package version and the device’s throttle settings.
- Trace the endpoint from submitted token to verification method; custom code that skips the device method may skip its protections.
- Test repeated failures against the real deployed route and confirm attempts are delayed or limited as intended.
- Ensure your broader login protections cover OTP endpoints as well as password authentication.
Device-level back-off and application-level protections serve related but distinct purposes. Check both rather than assuming one automatically covers every route or abuse pattern. django-otp 1.7.3 documentation: Overview
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4. Trying one submitted token against every registered device
A user may have several enrolled devices, such as an authenticator app and a static recovery device. Do not submit a token to each device in turn and accept whichever one matches. The django-otp documentation warns that failed checks against unintended devices can trigger throttling, including on static devices.
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Adding django-otp is only one part of the login design
django-otp provides device types and integration points, but installation is not the whole authentication design. Its documentation treats plugin installation, OTP-enabled login views, restricting access until verification, and device registration as separate tasks. Review each part of the flow: a correct device check is not enough if protected views remain accessible before verification or enrollment and recovery are not handled safely. django-otp 1.7.3 documentation: Overview
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