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docs: Mention Camo does not use a local Smokescreen in the proxies docs.

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This documents the new behaviour in d328d3dd4d.

(cherry picked from commit be1c4c2bd8)
This commit is contained in:
Alex Vandiver
2022-01-07 15:19:31 -08:00
parent e088b343b3
commit c3adbcea13
2 changed files with 11 additions and 0 deletions
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6
docs/production/deployment.md
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@@ -212,6 +212,11 @@ To protect against [SSRF][ssrf], Zulip 4.8 and above default to
routing all outgoing HTTP and HTTPS traffic through
[Smokescreen][smokescreen], an HTTP `CONNECT` proxy; this includes
outgoing webhooks, website previews, and mobile push notifications.
By default, the Camo image proxy will be automatically configured to
use a custom outgoing proxy, but does not use Smokescreen by default
because Camo includes similar logic to deny access to private
subnets. You can [override][proxy.enable_for_camo] this default
configuration if desired.
To use a custom outgoing proxy:
@@ -247,6 +252,7 @@ In Zulip 4.7 and older, to enable SSRF protection via Smokescreen, you
will need to explicitly add the `zulip::profile::smokescreen` Puppet
class, and configure the `[http_proxy]` block as above.
[proxy.enable_for_camo]: #enable-for-camo
[smokescreen]: https://github.com/stripe/smokescreen
[smokescreen-acls]: https://github.com/stripe/smokescreen#acls
[ssrf]: https://owasp.org/www-community/attacks/Server_Side_Request_Forgery

5
docs/production/security-model.md
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@@ -263,9 +263,14 @@ strength allowed is controlled by two settings in
internal corporate network. The default Smokescreen configuration
denies access to all non-public IP addresses, including 127.0.0.1.
The Camo image server does not, by default, route its traffic
through Smokescreen, since Camo includes logic to deny access to
private subnets; this can be [overridden][proxy.enable_for_camo].
[go-camo]: https://github.com/cactus/go-camo
[ssrf]: https://owasp.org/www-community/attacks/Server_Side_Request_Forgery
[smokescreen-setup]: ../production/deployment.html#customizing-the-outgoing-http-proxy
[proxy.enable_for_camo]: ../production/deployment.html#enable-for-camo
## Final notes and security response