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  3. if you disable all third-party cookies in your browser (like where Site A is never allowed to use cookies from Site B), have you noticed that it breaks anything?

if you disable all third-party cookies in your browser (like where Site A is never allowed to use cookies from Site B), have you noticed that it breaks anything?

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  • b0rk@social.jvns.caB b0rk@social.jvns.ca

    @Viss i guess i don't understand why because I've implemented basic OAuth login before and I don't remember any cookies being involved. Definitely there's just something basic I'm missing though.

    cthos@mastodon.cthos.devC This user is from outside of this forum
    cthos@mastodon.cthos.devC This user is from outside of this forum
    cthos@mastodon.cthos.dev
    wrote last edited by
    #18

    @b0rk @Viss You're not! You don't need 3rd party cookies to do basic OIDC/OAuth, that's one of the main points of it.

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    • oleschri@chaos.socialO oleschri@chaos.social

      @dmerej @b0rk

      No. That is not true anymore.

      dmerej@mamot.frD This user is from outside of this forum
      dmerej@mamot.frD This user is from outside of this forum
      dmerej@mamot.fr
      wrote last edited by
      #19

      @oleschri @b0rk ah. Glad to know they fixed it ๐Ÿ˜‰

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      • b0rk@social.jvns.caB b0rk@social.jvns.ca

        @Viss i guess i don't understand why because I've implemented basic OAuth login before and I don't remember any cookies being involved. Definitely there's just something basic I'm missing though.

        viss@mastodon.socialV This user is from outside of this forum
        viss@mastodon.socialV This user is from outside of this forum
        viss@mastodon.social
        wrote last edited by
        #20

        @b0rk im suspecting it's going to vary from vendor to vendor. auth is just the first thing that came to mind. in building orbital (my asm platform) we tried to use 0auth to do 2fa and there were big problems in firefox and chrome with respect to third party cookies. we ended up going entirely local for 2fa after they changed their pricing model so it stopped being an issue

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        • dmerej@mamot.frD dmerej@mamot.fr

          @oleschri @b0rk

          basically *everything* from Microsoft breaks (from Teams to Outlook to Azure)

          duncan_lithgow@mastodon.socialD This user is from outside of this forum
          duncan_lithgow@mastodon.socialD This user is from outside of this forum
          duncan_lithgow@mastodon.social
          wrote last edited by
          #21

          @dmerej
          I find I often have to log in again for different parts of the Microsoft 'experience' but that's no big deal with a password manager (#bitwarden in my case)
          @oleschri @b0rk

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          • hylomorphism@mastodon.me.ukH hylomorphism@mastodon.me.uk

            @b0rk I've had 3rd party cookies disabled for years, and I use Vivaldi with full blocking turned on and very little breaks. Anything I come across which doesn't work properly I just don't use.

            duncan_lithgow@mastodon.socialD This user is from outside of this forum
            duncan_lithgow@mastodon.socialD This user is from outside of this forum
            duncan_lithgow@mastodon.social
            wrote last edited by
            #22

            @hylomorphism
            Also blocked 3rd party cookies for years. I also use privacy badger.
            @b0rk

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            • cthos@mastodon.cthos.devC cthos@mastodon.cthos.dev

              @b0rk @Viss In the OIDC/OAuth sense it doesn't, and for a while there Google stopped using them on its own auth flow (using some redirect trickery to get youtube.com to work properly) when they were actively working on disabling them in Chrome (which they backed off of because advertising).

              craigstuntz@discuss.systemsC This user is from outside of this forum
              craigstuntz@discuss.systemsC This user is from outside of this forum
              craigstuntz@discuss.systems
              wrote last edited by
              #23

              @cthos @b0rk @Viss Yes, I block 3rd party cookies and I can still log in with Google to a third party site. This is probably not universally true for all SSO providers, but it does work with Google. @b0rk the main thing I've noticed which breaks (unclear if it's due to 3rd party cookies per se or some other setting I have) is embeds of tweets and Disqus.

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              • b0rk@social.jvns.caB b0rk@social.jvns.ca

                if you disable all third-party cookies in your browser (like where Site A is never allowed to use cookies from Site B), have you noticed that it breaks anything? What breaks?

                freddy@social.security.plumbingF This user is from outside of this forum
                freddy@social.security.plumbingF This user is from outside of this forum
                freddy@social.security.plumbing
                wrote last edited by
                #24

                @b0rk very few pages break, I used the setting for a long while. I think webkit used to do it by default for some time, even? a good middle-ground is to do cookie-partitioning based on the first party. that's what Firefox does.

                b0rk@social.jvns.caB 1 Reply Last reply
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                • viss@mastodon.socialV viss@mastodon.social

                  @b0rk well it'd be for things like if you go to like, i dunno, stackoverflow or somewhere else, and you get that popup that says 'login with google'. im not sure if facebook or twitter are still popular methods for this, but those would also fall into the same category. also any place using stuff like okta or nextcloud for auth are gonna suffer the same way

                  schrotthaufen@mastodon.socialS This user is from outside of this forum
                  schrotthaufen@mastodon.socialS This user is from outside of this forum
                  schrotthaufen@mastodon.social
                  wrote last edited by
                  #25

                  @Viss @b0rk Last time I checked, Duo, and SSO with Entra-ID didnโ€™t work when third party cookies were disabled, as well.

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                  • b0rk@social.jvns.caB b0rk@social.jvns.ca

                    if you disable all third-party cookies in your browser (like where Site A is never allowed to use cookies from Site B), have you noticed that it breaks anything? What breaks?

                    airtower@woem.menA This user is from outside of this forum
                    airtower@woem.menA This user is from outside of this forum
                    airtower@woem.men
                    wrote last edited by
                    #26

                    @b0rk@social.jvns.ca The only thing I've seen break is MS Teams (for work, unfortunately).

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                    • freddy@social.security.plumbingF freddy@social.security.plumbing

                      @b0rk very few pages break, I used the setting for a long while. I think webkit used to do it by default for some time, even? a good middle-ground is to do cookie-partitioning based on the first party. that's what Firefox does.

                      b0rk@social.jvns.caB This user is from outside of this forum
                      b0rk@social.jvns.caB This user is from outside of this forum
                      b0rk@social.jvns.ca
                      wrote last edited by
                      #27

                      @freddy thanks, I think I need to read more of your writing / talks on browser security too ๐Ÿ™‚

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