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Author SHA1 Message Date
epriestley
1d34238dc9 Upgrade sessions digests to HMAC256, retaining compatibility with old digests
Summary:
Ref T13222. Ref T13225. We store a digest of the session key in the session table (not the session key itself) so that users with access to this table can't easily steal sessions by just setting their cookies to values from the table.

Users with access to the database can //probably// do plenty of other bad stuff (e.g., T13134 mentions digesting Conduit tokens) but there's very little cost to storing digests instead of live tokens.

We currently digest session keys with HMAC-SHA1. This is fine, but HMAC-SHA256 is better. Upgrade:

  - Always write new digests.
  - We still match sessions with either digest.
  - When we read a session with an old digest, upgrade it to a new digest.

In a few months we can throw away the old code. When we do, installs that skip upgrades for a long time may suffer a one-time logout, but I'll note this in the changelog.

We could avoid this by storing `hmac256(hmac1(key))` instead and re-hashing in a migration, but I think the cost of a one-time logout for some tiny subset of users is very low, and worth keeping things simpler in the long run.

Test Plan:
  - Hit a page with an old session, got a session upgrade.
  - Reviewed sessions in Settings.
  - Reviewed user logs.
  - Logged out.
  - Logged in.
  - Terminated other sessions individually.
  - Terminated all other sessions.
  - Spot checked session table for general sanity.

Reviewers: amckinley

Reviewed By: amckinley

Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam

Maniphest Tasks: T13225, T13222

Differential Revision: https://secure.phabricator.com/D19883
2018-12-13 16:15:38 -08:00
epriestley
3d816e94df Rename "PhabricatorHash::digest()" to "weakDigest()"
Summary: Ref T12509. This encourages code to move away from HMAC+SHA1 by making the method name more obviously undesirable.

Test Plan: `grep`, browsed around.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12509

Differential Revision: https://secure.phabricator.com/D17632
2017-04-06 15:43:33 -07:00
Jakub Vrana
32f91557f8 Store hash of session key
Summary:
This prevents security by obscurity.
If I have read-only access to the database then I can pretend to be any logged-in user.

I've used `PhabricatorHash::digest()` (even though we don't need salt as the hashed string is random) to be compatible with user log.

Test Plan:
Applied patch.
Verified I'm still logged in.
Logged out.
Logged in.

  $ arc tasks

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6080
2013-05-30 17:30:06 -07:00