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epriestley d450a08890 Support HMAC+SHA256 with automatic key generation and management
Summary:
Ref T12509. This adds support for HMAC+SHA256 (instead of HMAC+SHA1). Although HMAC+SHA1 is not currently broken in any sense, SHA1 has a well-known collision and it's good to look at moving away from HMAC+SHA1.

The new mechanism also automatically generates and stores HMAC keys.

Currently, HMAC keys largely use a per-install constant defined in `security.hmac-key`. In theory this can be changed, but in practice essentially no install changes it.

We generally (in fact, always, I think?) don't use HMAC digests in a way where it matters that this key is well-known, but it's slightly better if this key is unique per class of use cases. Principally, if use cases have unique HMAC keys they are generally less vulnerable to precomputation attacks where an attacker might generate a large number of HMAC hashes of well-known values and use them in a nefarious way. The actual threat here is probably close to nonexistent, but we can harden against it without much extra effort.

Beyond that, this isn't something users should really have to think about or bother configuring.

Test Plan:
  - Added unit tests.
  - Used `bin/files integrity` to verify, strip, and recompute hashes.
  - Tampered with a generated HMAC key, verified it invalidated hashes.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12509

Differential Revision: https://secure.phabricator.com/D17630
2017-04-06 15:42:59 -07:00
bin Add a profileimage generation workflow for the cli 2017-03-04 15:43:13 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Apply the wordwrap() hack for "To" to PHPMailerLite 2017-03-16 10:56:25 -07:00
resources Support HMAC+SHA256 with automatic key generation and management 2017-04-06 15:42:59 -07:00
scripts Add a profileimage generation workflow for the cli 2017-03-04 15:43:13 -08:00
src Support HMAC+SHA256 with automatic key generation and management 2017-04-06 15:42:59 -07:00
support Don't combine automatic output compression with "Content-Length" 2016-12-13 14:25:49 -08:00
webroot Fix filetree drag nav CSS 2017-03-31 08:37:45 -07:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Begin adding test coverage to GitHub Events API parsers 2016-03-09 09:30:07 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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