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epriestley adc2002d28 Make it easier to parse "X-Forwarded-For" with one or more load balancers 
Summary:
Fixes T13392. If you have 17 load balancers in sequence, Phabricator will receive requests with at least 17 "X-Forwarded-For" components in the header.

We want to select the 17th-from-last element, since prior elements are not trustworthy.

This currently isn't very easy/obvious, and you have to add a kind of sketchy piece of custom code to `preamble.php` to do any "X-Forwarded-For" parsing. Make handling this correctly easier.

Test Plan:
  - Ran unit tests.
  - Configured my local `preamble.php` to call `preamble_trust_x_forwarded_for_header(4)`, then made `/debug/` dump the header and the final value of `REMOTE_ADDR`.

```
$ curl http://local.phacility.com/debug/
<pre>

HTTP_X_FORWARDED_FOR =
   FINAL REMOTE_ADDR = 127.0.0.1
</pre>
```

```
$ curl -H 'X-Forwarded-For: 1.1.1.1, 2.2.2.2, 3.3.3.3, 4.4.4.4, 5.5.5.5, 6.6.6.6' http://local.phacility.com/debug/
<pre>

HTTP_X_FORWARDED_FOR = 1.1.1.1, 2.2.2.2, 3.3.3.3, 4.4.4.4, 5.5.5.5, 6.6.6.6
   FINAL REMOTE_ADDR = 3.3.3.3
</pre>
```

```
$ curl -H 'X-Forwarded-For: 5.5.5.5, 6.6.6.6' http://local.phacility.com/debug/
<pre>

HTTP_X_FORWARDED_FOR = 5.5.5.5, 6.6.6.6
   FINAL REMOTE_ADDR = 5.5.5.5
</pre>
```

Maniphest Tasks: T13392

Differential Revision: https://secure.phabricator.com/D20785
2019-09-05 04:30:13 -07:00
bin Remove "bin/accountadmin" and "scripts/user/add_user.php" 2019-08-20 17:58:20 -07:00
conf Remove an old digest in Celerity code and some obsolete configuration options 2019-01-04 13:43:38 -08:00
externals Remove WePay support from Phortune, and Restful/Httpful dependencies 2019-05-14 09:14:53 -07:00
resources Update Phortune Merchant UI to bring it in line with Account UI 2019-08-22 21:12:33 -07:00
scripts Remove "bin/accountadmin" and "scripts/user/add_user.php" 2019-08-20 17:58:20 -07:00
src Make it easier to parse "X-Forwarded-For" with one or more load balancers 2019-09-05 04:30:13 -07:00
support Make it easier to parse "X-Forwarded-For" with one or more load balancers 2019-09-05 04:30:13 -07:00
webroot Make it easier to parse "X-Forwarded-For" with one or more load balancers 2019-09-05 04:30:13 -07:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Move web application classes into "phabricator/" 2019-09-02 07:58:59 -07:00
.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

README.md

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