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Docs/ACLs: Add router examples with subnets

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Nico Rey 2022-03-17 19:58:34 -03:00
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docs/acls.md
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@ -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:<tag1>,tag:<tag2>`, 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