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847b7977c1
Summary:
This adds a system which basically keeps a record of recent actions, who took them, and how many "points" they were worth, like:
epriestley email.add 1 1233989813
epriestley email.add 1 1234298239
epriestley email.add 1 1238293981
We can use this to rate-limit actions by examining how many actions the user has taken in the past hour (i.e., their total score) and comparing that to an allowed limit.
One major thing I want to use this for is to limit the amount of error email we'll send to an email address. A big concern I have with sending more error email is that we'll end up in loops. We have some protections against this in headers already, but hard-limiting the system so it won't send more than a few errors to a particular address per hour should provide a reasonable secondary layer of protection.
This use case (where the "actor" needs to be an email address) is why the table uses strings + hashes instead of PHIDs. For external users, it might be appropriate to rate limit by cookies or IPs, too.
To prove it works, I rate limited adding email addresses. This is a very, very low-risk security thing where a user with an account can enumerate addresses (by checking if they get an error) and sort of spam/annoy people (by adding their address over and over again). Limiting them to 6 actions / hour should satisfy all real users while preventing these behaviors.
Test Plan:
This dialog is uggos but I'll fix that in a sec:
{F137406}
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D8683
12 lines
431 B
SQL
12 lines
431 B
SQL
CREATE TABLE {$NAMESPACE}_system.system_actionlog (
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id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
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actorHash CHAR(12) NOT NULL COLLATE latin1_bin,
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actorIdentity VARCHAR(255) NOT NULL COLLATE utf8_bin,
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action CHAR(32) NOT NULL COLLATE utf8_bin,
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score DOUBLE NOT NULL,
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epoch INT UNSIGNED NOT NULL,
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KEY `key_epoch` (epoch),
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KEY `key_action` (actorHash, action, epoch)
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) ENGINE=InnoDB, COLLATE utf8_general_ci;
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