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epriestley 63828f5806 Store and verify content integrity checksums for files
Summary:
Ref T12470. This helps defuse attacks where an adversary can directly take control of whatever storage engine files are being stored in and change data there. These attacks would require a significant level of access.

Such attackers could potentially attack ranges of AES-256-CBC encrypted files by using Phabricator as a decryption oracle if they were also able to compromise a Phabricator account with read access to the files.

By storing a hash of the data (and, in the case of AES-256-CBC files, the IV) when we write files, and verifying it before we decrypt or read them, we can detect and prevent this kind of tampering.

This also helps detect mundane corruption and integrity issues.

Test Plan:
  - Added unit tests.
  - Uploaded new files, saw them get integrity hashes.
  - Manually corrupted file data, saw it fail. Used `bin/files cat --salvage` to read it anyway.
  - Tampered with IVs, saw integrity failures.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12470

Differential Revision: https://secure.phabricator.com/D17625
2017-04-05 11:12:31 -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 Fix filetree drag nav CSS 2017-03-31 08:37:45 -07:00
scripts Add a profileimage generation workflow for the cli 2017-03-04 15:43:13 -08:00
src Store and verify content integrity checksums for files 2017-04-05 11:12:31 -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

Phabricator is a collection of web applications which help software companies build better software.

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