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epriestley a37b28ef79 Prevent inbound processing of the "void/placeholder" address and other reserved addresses
Summary:
Depends on D19952. Ref T13222. Never process mail targets if they match:

  - The "default" address which we send mail "From".
  - The "void" address which we use as a placholder "To" when we only have "CC" addresses.
  - Any address from a list of reserved/administrative names.

The first two prevent loops. The third one prevents abuse.

There's a reasonably well-annotated list of reservations and reasons here:

https://webmasters.stackexchange.com/questions/104811/is-there-any-list-of-email-addresses-reserved-because-of-security-concerns-for-a

Stuff like `support@` seems fine; stuff like `ssladmin@` might let you get SSL certs issued for a domain you don't control.

Also, forbid users from creating application emails with these reserved addresses.

Finally, build the default and void addresses somewhat more cleverly.

Test Plan: Added unit tests, tried to configured reserved addresses, hit the default/void cases manually with `bin/mail receive-test`.

Reviewers: amckinley

Reviewed By: amckinley

Subscribers: olexiy.myronenko

Maniphest Tasks: T13222

Differential Revision: https://secure.phabricator.com/D19953
2019-01-16 12:28:53 -08:00
bin Remove dead symlink 2019-01-10 16:27:45 -08:00
conf Remove an old digest in Celerity code and some obsolete configuration options 2019-01-04 13:43:38 -08:00
externals Remove Twilio-PHP API external 2019-01-03 04:04:00 -08:00
resources Add a skeleton for configurable MFA provider types 2019-01-16 12:27:23 -08:00
scripts call qsprintf() without warnings 2019-01-14 09:41:31 -08:00
src Prevent inbound processing of the "void/placeholder" address and other reserved addresses 2019-01-16 12:28:53 -08:00
support Use phutil_microseconds_since(...) to simplify some timing arithmetic 2018-11-08 16:46:32 -08:00
webroot Correct a zero-based month tooltip on burnup charts 2019-01-15 18:09:18 -08:00
.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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