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0b9c54a6bb
Summary: Suhosin has about 50 options for filtering input variables, doucmented here: http://www.hardened-php.net/suhosin/configuration.html The default behavior of Suhosin is to drop the variable entirely if it violates any of the rules, then continue with the request. It doesn't affect 'php://input' and doesn't drop other variables, so it evades existing detection, and we can't figure out that it's happened at runtime. We could add blanket checks (Suhosin enabled + suhosin.filter.action set to nothing means this may happen, and will be undetectable if it does happen) but can't tailor a check or recovery to this specific problem. Instead, raise a better error in the specific case where we encounter this, which is Conduit calls of "arc diff" of files over 1MB (the default POST limit). In these cases, Suhosin drops the variable entirely. If there is no 'params', scream. We never encounter this case normall (`arc`, including `arc call-conduit`, always sends this parameter) although other clients might omit it. The only exception is the web console with `conduit.ping`, which submits nothing; make it submit something so it keeps working. See also https://github.com/facebook/phabricator/issues/233#issuecomment-11186074 Test Plan: Brought up a Debian + Suhosin box, verified the behavior of Suhosin, made requests with and without 'params'. Reviewers: btrahan, vrana Reviewed By: btrahan CC: aran Differential Revision: https://secure.phabricator.com/D4144 |
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Phabricator is a open source collection of web applications which make it easier to write, review, and share source code. Phabricator was developed at Facebook. This is an early release. It's pretty high-quality and usable, but under active development so things may change quickly. You can learn more about the project and find links to documentation and resources at: http://phabricator.org/ LICENSE Phabricator is released under the Apache 2.0 license except as otherwise noted.