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epriestley 794e185bf9 Pass SSH wrappers to VCS commands unconditonally, not just if there's an SSH remote 
Summary:
Ref T12961. In Mercurial, it's possible to have "subrepos" which may use a different protocol than the main repository.

By putting an SSH repository inside an HTTP repository, an attacker can theoretically get us to execute `hg` without overriding `ui.ssh`, then execute code via the SSH hostname attack.

As an immediate mitigation to this attack, specify `ui.ssh` unconditionally. Normally, this will have no effect (it will just be ignored). In the specific case of an SSH repo inside an HTTP repo, it will defuse the `ssh` protocol.

For good measure and consistency, do the same for Subversion and Git. However, we don't normally maintain working copies for either Subversion or Git so it's unlikely that similar attacks exist there.

Test Plan:
  - Put an SSH subrepo with an attack URI inside an HTTP outer repo in Mercurial.
  - Ran `hg up` with and without `ui.ssh` specified.
  - Got dangerous badness without `ui.ssh` and safe `ssh` subprocesses with `ui.ssh`.

I'm not yet able to confirm that `hg pull -u -- <uri>` can actually trigger this, but this can't hurt and our SSH wrapper is safer than the native behavior for all Subversion, Git and Mercurial versions released prior to today.

Reviewers: chad

Reviewed By: chad

Subscribers: cspeckmim

Maniphest Tasks: T12961

Differential Revision: https://secure.phabricator.com/D18389
2017-08-10 17:49:55 -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 Add profile images to Repositories 2017-06-12 07:51:39 -07:00
resources Fix a hang in fancy date picker for Ye Olde Time Years 2017-08-10 08:48:44 -07:00
scripts Treat commit hook execution in observed repositories as a no-op, not an error 2017-08-01 08:32:42 -07:00
src Pass SSH wrappers to VCS commands unconditonally, not just if there's an SSH remote 2017-08-10 17:49:55 -07:00
support Update rate limiting for APCu and X-Forwarded-For 2017-04-21 20:39:14 -07:00
webroot Fix a hang in fancy date picker for Ye Olde Time Years 2017-08-10 08:48:44 -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
.editorconfig
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE
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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