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authorEugen Rochko <eugen@zeonfederated.com>2018-10-12 00:15:55 +0200
committerGitHub <noreply@github.com>2018-10-12 00:15:55 +0200
commit21ad21cb507d7a5f48ef8ee726b2f9308052aa9d (patch)
tree284171d0d32dd98d09a33a7d27c42827cf9a3d25 /config/locales/doorkeeper.th.yml
parent2d27c110610a848d30fe150c58bbd60ebf6fab7c (diff)
Improve signature verification safeguards (#8959)
* Downcase signed_headers string before building the signed string

The HTTP Signatures draft does not mandate the “headers” field to be downcased,
but mandates the header field names to be downcased in the signed string, which
means that prior to this patch, Mastodon could fail to process signatures from
some compliant clients. It also means that it would not actually check the
Digest of non-compliant clients that wouldn't use a lowercased Digest field
name.

Thankfully, I don't know of any such client.

* Revert "Remove dead code (#8919)"

This reverts commit a00ce8c92c06f42109aad5cfe65d46862cf037bb.

* Restore time window checking, change it to 12 hours

By checking the Date header, we can prevent replaying old vulnerable
signatures. The focus is to prevent replaying old vulnerable requests
from software that has been fixed in the meantime, so a somewhat long
window should be fine and accounts for timezone misconfiguration.

* Escape users' URLs when formatting them

Fixes possible HTML injection

* Escape all string interpolations in Formatter class

Slightly improve performance by reducing class allocations
from repeated Formatter#encode calls

* Fix code style issues
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