@Oneric explained:
> Spec says query params must be included in the signature; Mastodon
> being Mastodon used to always exclude it though and for
> compatibility everyone followed this. At some point GtS decided to
> follow spec instead which caused interop issues, but succeeded in
> getting Mastodon (and others like *oma) to accept incoming requests
> with (and also still without) query params though outgoing requests
> remaing query-param-free. Some still only accept query-param-less
> requests though and GtS uses a retry mechanism to resend any request
> failing with 401 with an query-parama-less signature once. (Also
> see:
> https://docs.gotosocial.org/en/latest/federation/http_signatures/ )
>
> So for incoming requests both versions need to be checked. For
> outgoing requests, unless you want to jump through retry hoops like
> GtS, omitting query-params is the safer bet for now (presumably this
> will only change if Mastodon ever decides to send out requests
> signed with query params)
* enhance: Add a few validation fixes from Sharkey
See the original MR on the GitLab instance:
https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/484
Co-Authored-By: Dakkar <dakkar@thenautilus.net>
* fix: primitive 2: acceptance of cross-origin alternate
Co-Authored-By: Laura Hausmann <laura@hausmann.dev>
* fix: primitive 3: validation of non-final url
* fix: primitive 4: missing same-origin identifier validation of collection-wrapped activities
* fix: primitives 5 & 8: reject activities with non
string identifiers
Co-Authored-By: Laura Hausmann <laura@hausmann.dev>
* fix: primitive 6: reject anonymous objects that were fetched by their id
* fix: primitives 9, 10 & 11: http signature validation
doesn't enforce required headers or specify auth header name
Co-Authored-By: Laura Hausmann <laura@hausmann.dev>
* fix: primitive 14: improper validation of outbox, followers, following & shared inbox collections
* fix: code style for primitive 14
* fix: primitive 15: improper same-origin validation for
note uri and url
Co-Authored-By: Laura Hausmann <laura@hausmann.dev>
* fix: primitive 16: improper same-origin validation for user uri and url
* fix: primitive 17: note same-origin identifier validation can be bypassed by wrapping the id in an array
* fix: code style for primitive 17
* fix: check attribution against actor in notes
While this isn't strictly required to fix the exploits at hand, this
mirrors the fix in `ApQuestionService` for GHSA-5h8r-gq97-xv69, as a
preemptive countermeasure.
* fix: primitive 18: `ap/get` bypasses access checks
One might argue that we could make this one actually preform access
checks against the returned activity object, but I feel like that's a
lot more work than just restricting it to administrators, since, to me
at least, it seems more like a debugging tool than anything else.
* fix: primitive 19 & 20: respect blocks and hide more
Ideally, the user property should also be hidden (as leaving it in leaks
information slightly), but given the schema of the note endpoint, I
don't think that would be possible without introducing some kind of
"ghost" user, who is attributed for posts by users who have you blocked.
* fix: primitives 21, 22, and 23: reuse resolver
This also increases the default `recursionLimit` for `Resolver`, as it
theoretically will go higher that it previously would and could possibly
fail on non-malicious collection activities.
* fix: primitives 25-33: proper local instance checks
* revert: fix: primitive 19 & 20
This reverts commit 465a9fe6591de90f78bd3d084e3c01e65dc3cf3c.
---------
Co-authored-by: Dakkar <dakkar@thenautilus.net>
Co-authored-by: Laura Hausmann <laura@hausmann.dev>
Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>
`/users/:user`, `/@:user`, `/notes/:note` return different responses
depending on the request's `Accept:` header. If we don't consistently
return a `Vary: Accept` header, browsers and caching proxies will get
confused, and return AP representations when HTML was requested, or
vice versa.
Co-authored-by: dakkar <dakkar@thenautilus.net>
Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>
I could have factored out all the lines that set cache headers, but
that would have made future merges even more complicated ☹
thanks ShittyCopper for reporting the problem!
