this post was submitted on 23 Feb 2024
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CRA now allows 2FA apps (infosec.pub)
submitted 8 months ago by [email protected] to c/[email protected]
26 comments fedilink hide all child comments
 

What the title says. Before you had to choose either SMS / call via phone or a very clunky code grid.

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[–] [email protected] 4 points 8 months ago* (last edited 8 months ago) (4 children)

Not OP but I wanted to read more (edit: about CRA’s approach to TOTP, before getting the chance to try it myself), I searched and found this: https://www.canada.ca/en/revenue-agency/services/e-services/cra-login-services/multi-factor-authentication-access-cra-login-services.html#toc3

What is a third-party authenticator app?

A third-party authenticator app can be installed on an app enabled mobile or desktop device to be used for MFA. The app store offers many free third-party authenticator app options to choose from. Users will need to download an app that is compatible with the CRA sign-in services.

Using the app, the user scans a QR code with a mobile device when prompted. If unable to scan the QR code the user can manually enter the setup key the CRA provides into the app. The app will now be set up and the user will not have to complete this step again.

The app will then generate a 6 digit Time-Based One-Time Passcode (TOTP). When signing in to the CRA sign-in services users will be required to enter a one-time passcode provided by the app. For security, the app will generate a new TOTP every 30 seconds.

Edit: This is awesome, I’m so glad I can switch away from SMS 2FA on yet another service (and such an important one). But I am curious about a few things, see below.

Some thoughts:

  • (edit: my bad, I thought 60 seconds was more common but I checked my other TOTP and they seem to be 30 seconds) ~~why is it 30 seconds instead of 60 seconds? I’m pretty sure every other TOTP I’ve seen is 60 seconds. What is the benefit of this? Someone has 30 fewer seconds to read the code over your shoulder and log in on their device?~~
  • TD offers a passcode generator app, but it seems like you can’t disable SMS 2FA, so if you’re worried about SIM jacking then you are out of luck. Presumably they’re worried about people losing their device with the TOTP secret, but I usually back that up on multiple devices and have recovery codes. I think all the big banks are similar. Edit: I’m curious to know what CRA does, but I’m away from my PC right now.
  • nit: the previous login requires you to re enter the code from SMS 2FA or the grid thing every 8 hours I believe. But most other services seem to let you persist a cookie on the device for 30 days or so, presumably because cookie theft isn’t a huge risk, and because entering your password alone is enough to prevent other people with access to your computer from accessing your sensitive CRA account

Anyway, sorry for the negativity. This is a great step and I shouldn’t focus on negative things. I just hate how accounts I don’t care much about like Facebook (and formerly Runescape) accounts seem to be more secure from malicious logins than my bank and possibly CRA accounts.

[–] [email protected] 5 points 8 months ago

Also big pro is that they allow third party TOTP apps instead of making their own like TD and even Steam (bundling it into their main app).

[–] [email protected] 3 points 8 months ago* (last edited 8 months ago) (1 children)

why is it 30 seconds instead of 60 seconds? I’m pretty sure every other TOTP I’ve seen is 60 seconds. My jaded take: the blind pursuit of “better security” even though… what does this even imply? Someone has 30 fewer seconds to read the code over your shoulder and log in on their device?

30 seconds is the default for TOTP implementations.

I’m curious to know what CRA does, but I’m away from my PC right now.

Yes, you can stop getting SMS messages.

edit: formatting

[–] [email protected] 1 points 8 months ago

Thanks, I edited my comment. No idea how I missed that it was 30 seconds for all this time. It looks like my own TOTP codes are even 30 seconds so I don’t know what I was thinking.

[–] [email protected] 2 points 8 months ago (1 children)

I also use TD. That they still allow only SMS for 2FA should be a crime.

[–] [email protected] 1 points 8 months ago (2 children)

Unfortunately I think this is the norm with big banks in Canada, and it is similar to a credit union in the US from when I briefly lived there. Security seems to be a second priority to people losing access (presumably only briefly, since they have brick and mortar locations everywhere).

Wealthsimple and Questrade seem to support TOTP but I’m not sure if you can still bypass it with SMS. I don’t think so but I haven’t dug into it.

I’ve used CIBC before and they also seem to require keeping SMS 2FA enabled. Also they send me fraud alerts over SMS, “respond Y to authorize this suspicious transaction”, and I’m dreading the day where I have to enable roaming while travelling just to send a text. They send push notifications through the app to login on a new device though, so maybe in 10 years they’ll do it for transaction approval too.

Also aside about TD: is there really no way to download a CSV file of all your transactions? My partner uses them and I think we were limited to 18 months, and may have even had to download each much separately (luckily I can use use a program like cat to workaround this, but that seems like a pain for most people). CIBC has irritated me in a lot of ways but I think I can download transactions from back to 2012 when I first opened my credit card, maybe earlier.

Do you or anyone know about other big banks? My partner and I are looking into a joint account and I want to be able to download all transactions to CSV. Ideally we could get TOTP only (no SMS 2FA) but I’m not counting on it.

[–] [email protected] 2 points 8 months ago (1 children)

Over the years, I've been with all the big Canadian banks and a couple of different credit union networks. They're all trash, in my opinion. I've sent security notices to all of them and never had a response, nor any evidence that they addressed the problems. TD just happens to be the place we landed after giving up on everyone else.

As for transaction downloads, I couldn't tell you. I gave up on ever having access to my data, so I just record it manually.

Security notice examples:

TD was running their SSL/TLS in a way that made them vulnerable to downgrade attacks.

A credit union finally upgraded their login page to allow a real password instead of just a 6-digit PIN. It took repeated complaints and some customer lobbying to get that, but the new page also blocked access to pasting and autofill, negating the utility of a password manager.

[–] [email protected] 2 points 8 months ago (1 children)

Ah, I hadn’t heard of the SSL issue, thanks for sharing!

I’ve noticed that Tangerine only allows for a 6 digit pin, but I think they might also allow for a security question and SMS 2FA? I started signing up with them and gave up when they required a Canadian cell number (I hadn’t yet switched due to high costs, but recently they’ve become surprisingly reasonable—ignoring roaming) and I saw the 6 digit pin password requirement.

I think it was also BMO that a friend told me required a maximum 8 character password until very recently?

Anyway overall, thanks for reassuring my suspicion: I should just pick one of the banks and not let “perfect” (or even “decent”) be the enemy of “almost adequate but not great”.

[–] [email protected] 2 points 8 months ago

Also, for what it's worth, TD is not just the only bank I know of, but the only website I know of that allows for a user-generated username to be used for login. My TD username was generated by the password generator of my password manager :)

So they don't get it all wrong.

[–] [email protected] 2 points 8 months ago (1 children)

Wealthsimple and Questrade seem to support TOTP but I’m not sure if you can still bypass it with SMS. I don’t think so but I haven’t dug into it.

Questrade allows TOTP, SMS and some other methods, but you can select which ones you want to enable. I have only TOTP and it works as expected.

[–] [email protected] 1 points 8 months ago (1 children)

Thanks, I suspected this (I only see “authenticator app” when I log in on a new device or periodically, but I wasn’t sure.

Related: for finance related services like Questrade, I’ve stored my TOTP keys on a U2F key, Yubico in my case. Besides the hassle of managing physical keys, is there any drawback to this approach? I’m slightly worried I’ll lose all my keys in a house fire or something, but I assume there’s a recovery option.

[–] [email protected] 1 points 8 months ago

That I don't know. I store the TOTP keys into an app on my phone an into a separated KeePass DB that's different from my regular one. Two copies of that is good enough to let me sleep at night.

[–] [email protected] 1 points 8 months ago* (last edited 8 months ago)

It looks like you may be able to disable SMS 2FA entirely? It’s unclear to me (edit: if this is a viable option):

Can I stop getting Short Messaging Service (SMS) messages for CRA's Multi-factor authentication?

Yes. You can text "STOP" to 27223 or reply "STOP" to the message containing your one-time passcode to stop receiving SMS messages to that telephone number in the future. However, it is important to note that CRA's Multi-factor authentication (MFA) service is mandatory and a passcode is required to sign in to the CRA's sign-in services. Texting "STOP" will prevent your telephone from receiving an SMS message with your passcode in the future. Without the passcode, you will be unable to access the CRA sign-in services using this option and will need to choose an alternate MFA option to use. This option applies only to Canadian telephone numbers.

I’ll probably leave it enabled anyway just in case (given that I only log in to CRA once per year or so), but I applaud the potential of relying on TOTP only, and not allowing SMS 2FA as a “back door”.