workload identity auth failure when audit is enabled

[louievandyke]

Nomad version

Output from nomad version

root@ubuntu-focal:/home/vagrant# nomad --version
Nomad v1.4.0+ent (ea16107)

Operating system and Environment details

root@ubuntu-focal:/home/vagrant# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Codename: focal

Issue

After upgrading to Nomad v1.4.0+ent I noticed that restarting certain jobs resulted in a pending error related to the Nomad service defined in my jobspec template.

Template | Missing: nomad.services

I had, before the upgrade, in place acl { enabled = true } and audit { enabled = true } on both the Servers and Clients agent configs. This was working with no issues.

After the upgrade I restarted the two jobs. One of the jobs (sleep1), which registers the Nomad service and then just sleeps forever, started fine. The second job, where I try and discover that service, fails complaining about a missing service.

Missing: nomad.service(consensus)

A work around I found, is if you have acl { enabled = true } and audit { enabled = true } on the Servers and then on the Client disable the acls and leave audit enabled acl { enabled = false } and audit {enabled = true} it will start working after an agent restart on the client. I believe this may only leave vulnerable the /v1/client endpoints as you still need a token to get to the UI and to run CLI commands on both the Servers and Clients.

Reproduction steps

on v1.3.2+ent I ran the two specs pasted below sleep1 and service-discovery while I had acl { enabled = true } and audit { enabled = true } on the Servers and Clients

job "sleep1" {

  datacenters = ["dc1"]

  meta {
    mydata = "hello2"
  }

  type = "service"

  group "testing1" {

    network {
      mode = "host"

      port "test-port" {
        to     = 80
        static = 80
      }

    }

    task "sleepy-1" {

      service {
        name     = "consensus"
        provider = "nomad"
        port     = "test-port"
        tags     = ["test1-sleep"]
      }

      driver = "exec"
      config {
        command = "sleep"
        args    = ["infinity"]
      }
    }

  }

}

job "service-discovery" {

  datacenters = ["dc1"]

  meta {
    test = "a"
  }

  type = "service"

  group "discovering" {

    task "fill-template" {

      driver = "exec"
      config {
        command = "sleep"
        args    = ["infinity"]
      }

      template {
        data        = <<-EOH
TESTING THINGS

consensus loop test
{{ range $i, $s :=  nomadService "consensus" }}
    Service beacon-{{ $i }} : {{ .Address }}:{{ .Port }};
{{ end }}
EOH
        destination = "local/test.cfg"
      }

    }

  }
}

I then upgraded the binary to Nomad v1.4.0+ent on both Server and Client and restarted the Nomad agent. Both jobs continued to run fine but when I restarted each, the service-discovery job would not start due to errors about discovering the service. The only way to fix this is to remove the acl block from the clients agent config and restart the Nomad agent.

Expected Result

Audit and ACL behavior to remain consistent on upgrade paths

Actual Result

ACL appears to block the client after upgrading to v1.4.0+ent

Job file (if appropriate)

see above

Nomad Server logs (if appropriate)

Some logs related to this behavior...

2023-01-12T18:51:16.847Z [ERROR] http: request failed: method=GET path="/v1/service/consensus?namespace=default&stale=&wait=60000ms" error="rpc error: acl token lookup failed: index error: UUID must be 36 characters" code=500
2023-01-12T18:51:16.847Z [DEBUG] http: request complete: method=GET path="/v1/service/consensus?namespace=default&stale=&wait=60000ms" duration=4.850001ms
2023-01-12T18:51:16.849Z [WARN]  agent: (view) nomad.service(consensus): Unexpected response code: 500 (rpc error: acl token lookup failed: index error: UUID must be 36 characters) (retry attempt 8 after "32s")
2023-01-12T18:51:48.855Z [ERROR] client.rpc: error performing RPC to server: error="rpc error: acl token lookup failed: index error: UUID must be 36 characters" rpc=ACL.ResolveToken server=172.16.66.130:4647

Nomad Client logs (if appropriate)

[lgfa29]

Hi @louievandyke 👋

I think this may have been fixed by #15140. Would you mind trying this upgrade path but going to 1.4.3+ent instead of 1.4.0+ent?

Thanks!

[louievandyke]

Hi @lgfa29

I just tried the upgrade path going to 1.4.3+ent (from 1.3.2+ent) and I ran into the same situation.

The service discovery fails with the below display messages in the events.

"DisplayMessage": "Missing: nomad.service(consensus)",

"DisplayMessage": "Template failed: nomad.service(consensus): Unexpected response code: 500 (rpc error: acl token lookup failed: index error: UUID must be 36 characters)",

[tgross]

I investigated this and was able to reproduce on 1.4.3+ent but not on main. After doing a git bisect on the Enterprise code base, I determined that this bug was fixed by @schmichael in #16254. That shipped in Nomad 1.5.0, which is currently older than the oldest supported version of Nomad or Nomad Enterprise, so all users on supported versions have the fix.

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