From bff9036f14d56fd822353a85d7ad9d237e56549a Mon Sep 17 00:00:00 2001 From: Nico Rey Date: Thu, 17 Mar 2022 19:58:34 -0300 Subject: [PATCH] Docs/ACLs: Add router examples with subnets --- docs/acls.md | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-) diff --git a/docs/acls.md b/docs/acls.md index c94ddd93..910e3262 100644 --- a/docs/acls.md +++ b/docs/acls.md @@ -12,7 +12,8 @@ anything they want on dev hosts but only watch on productions hosts. Intern can only interact with the development servers. There's an additional server that acts as a router, connecting the VPN users -to an internal network 10.20.0.0/16 +to an internal network `10.20.0.0/16`. Developers must have access to those +internal resources. Each user have at least a device connected to the network and we have some servers. @@ -24,11 +25,16 @@ servers. - billing.internal - router.internal -## Setup of the network +![ACL implementation example](images/headscale-acl-network.png) -Namespaces will be created automatically when users authenticate with the +## ACL setup + +Note: Namespaces will be created automatically when users authenticate with the Headscale server. +ACLs could be written either on [huJSON](https://github.com/tailscale/hujson) +or Yaml. Check the [test ACLs](../tests/acls) for further information. + When registering the servers we will need to add the flag `--advertised-tags=tag:,tag:`, and the user (namespace) that is registering the server should be allowed to do it. Since anyone can add tags to @@ -65,6 +71,14 @@ Here are the ACL's to implement the same permissions as above: // interns cannot add servers }, + // hosts should be defined using its IP addresses and a subnet mask. + // to define a single host, use a /32 mask. You cannot use DNS entries here, + // as they're prone to be hijacked by replacing their IP addresses. + // see https://github.com/tailscale/tailscale/issues/3800 for more information. + "Hosts": { + "postgresql.internal": "10.20.0.2/32", + "webservers.internal": "10.20.10.1/29" + }, "acls": [ // boss have access to all servers { @@ -103,6 +117,16 @@ Here are the ACL's to implement the same permissions as above: "tag:prod-app-servers:80,443" ] }, + // developers have access to the internal network through the router. + // the internal network is composed of HTTPS endpoints and Postgresql + // database servers. There's an additional rule to allow traffic to be + // forwarded to the internal subnet, 10.20.0.0/16. See this issue + // https://github.com/juanfont/headscale/issues/502 + { + "action": "accept", + "users": ["group:dev"], + "ports": ["10.20.0.0/16:443,5432", "router.internal:0"] + }, // servers should be able to talk to database. Database should not be able to initiate connections to // applications servers