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Dns proxy #854

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merged 50 commits into from Sep 6, 2019

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@0xmchadha
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commented Aug 6, 2019

To support FQDN's in external networks, a dns proxy is instantiated per PU similar to the application proxy design. The DNS request response is matched with a policy to add application acls.

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commented Aug 6, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "6a0f90610e4cf0fd4d68b3a622a13becdbb47446"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "58763f744e831ff9e155a652443cb361bc45e20d"
  }
]
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commented Aug 7, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "dd1bfbb3c6aecec713eaaacfa9720179fa33bdad"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "f6719559b2a3b89b91b3a44a2c59c5b83e4240b8"
  }
]
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commented Aug 7, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "dd1bfbb3c6aecec713eaaacfa9720179fa33bdad"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "91aa204ae5d67c4d64780d25902a76e5f824df7e"
  }
]
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commented Aug 8, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "eb7f6b82c5c206e08c02ab46ca86c398cbfc3bd1"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "c6db344bf38c12d0f6f7150c41183e4a8dc0a778"
  }
]
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commented Aug 8, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "7c791128e46da78c50bb8bb9eeb2fe355583ca16"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "0939b93ba3502296521bdcf482de377e7bc91b5b"
  }
]

@0xmchadha 0xmchadha force-pushed the dnsProxy branch from 097d46f to 0566459 Aug 9, 2019

0xmchadha added 4 commits Aug 9, 2019
fix
fix

@0xmchadha 0xmchadha requested a review from dstiliadis Aug 9, 2019

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commented Aug 9, 2019

Codecov Report

Merging #854 into master will increase coverage by 0.08%.
The diff coverage is 62.79%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master     #854      +/-   ##
==========================================
+ Coverage   55.94%   56.03%   +0.08%     
==========================================
  Files         108      110       +2     
  Lines       10882    11053     +171     
==========================================
+ Hits         6088     6193     +105     
- Misses       4204     4255      +51     
- Partials      590      605      +15
Impacted Files Coverage Δ
...ller/internal/enforcer/nfqdatapath/datapath_tcp.go 58.37% <ø> (-0.33%) ⬇️
...forcer/internal/statscollector/collector_reader.go 44.73% <0%> (-2.49%) ⬇️
...orcer/internal/statscollector/collector_trireme.go 58.82% <0%> (-3.68%) ⬇️
controller/internal/enforcer/proxy/rpcserver.go 31.91% <0%> (-5.59%) ⬇️
controller/internal/enforcer/acls/acl.go 69.84% <0%> (-6.03%) ⬇️
...ler/internal/supervisor/iptablesctrl/legacyacls.go 0% <0%> (ø) ⬆️
utils/ipprefix/ipprefix.go 100% <100%> (ø) ⬆️
policy/puinfo.go 100% <100%> (ø) ⬆️
...emoteenforcer/internal/statscollector/collector.go 100% <100%> (ø) ⬆️
controller/pkg/fqconfig/fqconfig.go 82.66% <100%> (+0.47%) ⬆️
... and 16 more

Continue to review full report at Codecov.

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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0xmchadha added 4 commits Aug 12, 2019
return nil
}
}

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@dstiliadis

dstiliadis Aug 12, 2019

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Any chance of nils here?

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@0xmchadha

0xmchadha Aug 13, 2019

Author Contributor

No. We never store nil pointers in the portList array.

lc.Control = socketOptions

return lc.ListenPacket(context.Background(), network, addr)
}

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@dstiliadis

dstiliadis Aug 12, 2019

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Can't we get the context from above here. This will never be cancelled if it stops.

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@0xmchadha

0xmchadha Aug 13, 2019

Author Contributor

Not sure what you mean here. On unenforce of the PU, we call the shutdown function which releases the resources here.

})
},
Timeout: 500 * time.Millisecond,
}

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@dstiliadis

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This timeout is rather short. Ideally a parameter?

ips = append(ips, t.AAAA.String())
}
}

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@dstiliadis

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Entries have TTL. I think we should use the TTL to expire them. There is some interesting logic we can follow on that.

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@0xmchadha

0xmchadha Aug 13, 2019

Author Contributor

Yes, I will be doing TTL in a different PR. We will also have to add new api's in our ApplicationACLS to remove entries as well on expiry.

if err := w.WriteMsg(dnsReply); err != nil {
zap.L().Error("Writing dns response back to the client returned error", zap.Error(err))
}
}

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@dstiliadis

dstiliadis Aug 12, 2019

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We need some reporting for this or we are completely blind. I don't think logs are enough here, and there is value on reporting all the DNS requests. Let's start by creating a new flow report with DNS request and logging every one of these requests.

0xmchadha added 7 commits Aug 12, 2019
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commented Aug 29, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "apotests",
    "pr-id": "2229",
    "commit-sha": "0a8330240880d6f41b4569a9ce31039438a0003d"
  },
  {
    "project": "dns-proxy",
    "component": "backend",
    "pr-id": "524",
    "commit-sha": "19b2800a1849baee4e2cf2333c0d7f06d5932557"
  },
  {
    "project": "dns-proxy",
    "component": "apoctl",
    "pr-id": "197",
    "commit-sha": "548e99cbe02aad59648bf6bc134805b19bb1cd0c"
  },
  {
    "project": "dns-proxy",
    "component": "gaia",
    "pr-id": "388",
    "commit-sha": "ce1e4d25185549659d1b2fe8666d6249ddb24161"
  },
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "2329f768a274586a2f00074742cb32d9a73275de"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "edab1ab10775ef9e300bec8a28c6d273a29d2a78"
  }
]
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commented Aug 29, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "backend",
    "pr-id": "524",
    "commit-sha": "347460feb01c9f508ac2fc11423ceff19d7b8cf0"
  },
  {
    "project": "dns-proxy",
    "component": "apoctl",
    "pr-id": "197",
    "commit-sha": "5378cfb89c69dd73775921f929a82538d00bbdea"
  },
  {
    "project": "dns-proxy",
    "component": "gaia",
    "pr-id": "388",
    "commit-sha": "c8478f03e1c28ce41d5b7c7a8d2ef7f0c1d46018"
  },
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "2329f768a274586a2f00074742cb32d9a73275de"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "93964281d2e7be5ff97efe1267e6194c96938f82"
  },
  {
    "project": "dns-proxy",
    "component": "apotests",
    "pr-id": "2229",
    "commit-sha": "0a8330240880d6f41b4569a9ce31039438a0003d"
  }
]
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commented Aug 29, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "apotests",
    "pr-id": "2229",
    "commit-sha": "0a8330240880d6f41b4569a9ce31039438a0003d"
  },
  {
    "project": "dns-proxy",
    "component": "backend",
    "pr-id": "524",
    "commit-sha": "347460feb01c9f508ac2fc11423ceff19d7b8cf0"
  },
  {
    "project": "dns-proxy",
    "component": "apoctl",
    "pr-id": "197",
    "commit-sha": "5378cfb89c69dd73775921f929a82538d00bbdea"
  },
  {
    "project": "dns-proxy",
    "component": "gaia",
    "pr-id": "388",
    "commit-sha": "c8478f03e1c28ce41d5b7c7a8d2ef7f0c1d46018"
  },
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "2329f768a274586a2f00074742cb32d9a73275de"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "29a077d5be4bad1d31a67084c59eeabd33d25e5f"
  }
]
}
})
},
Timeout: dnsRequestTimeout,

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@dstiliadis

dstiliadis Aug 29, 2019

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Does the mark work here? Or do you need an external service anyway? I have a feeling that marking a UDP socket doesn't work.

}
puCtx.RemoveApplicationACL(ip, mask)
}
}()

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@dstiliadis

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I am little concerned about that. This will start a go-routine for every DNS request essentially. This can easily become a vector for an attack. Can't we just poll the table periodically and avoid per-request go-routines?

{{if isCgroupSet}}
{{.NatTable}} {{.NatProxyAppChain}} -p tcp -m set --match-set {{.DestIPSet}} dst,dst -m mark ! --mark {{.ProxyMark}} -m cgroup --cgroup {{.CgroupMark}} -j REDIRECT --to-ports {{.ProxyPort}}
{{.NatTable}} {{.NatProxyAppChain}} -p udp --dport 53 -m mark ! --mark {{.ProxyMark}} -m cgroup --cgroup {{.CgroupMark}} -j CONNMARK --save-mark
{{.NatTable}} {{.NatProxyAppChain}} -p udp --dport 53 -m mark ! --mark {{.ProxyMark}} -m cgroup --cgroup {{.CgroupMark}} -j REDIRECT --to-ports {{.DNSProxyPort}}

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That's problematic. With this we force proxying every time even if I don't want it .. I am not sure I want to do this. What if we define in the enforcer profile a flag to only enable this on demand and potentially with a target IP (ie I only want to trap DNS on port 53 for a subset of subnets.) .. I don't want to make the assumption that we should enable this by default always. It can create problems in lots of deployments.

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Whether proxy is enabled or not should be an option. I don't think its a good idea to always enable it. There are lots of scenarios where someone doesn't care about FQDN based ACLs .. and thus we don't care about proxying packets.

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commented Aug 30, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "backend",
    "pr-id": "524",
    "commit-sha": "347460feb01c9f508ac2fc11423ceff19d7b8cf0"
  },
  {
    "project": "dns-proxy",
    "component": "apoctl",
    "pr-id": "197",
    "commit-sha": "5378cfb89c69dd73775921f929a82538d00bbdea"
  },
  {
    "project": "dns-proxy",
    "component": "gaia",
    "pr-id": "388",
    "commit-sha": "34a0889300d27c5d642c88ebf9b95bf662d89b09"
  },
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "d82a148d32c81389b9ed16ffa5acd11e271bbfb1"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "9c502ed27ab4a4edaf05a9fad72169a013175668"
  },
  {
    "project": "dns-proxy",
    "component": "apotests",
    "pr-id": "2229",
    "commit-sha": "0a8330240880d6f41b4569a9ce31039438a0003d"
  }
]
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commented Aug 30, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "apoctl",
    "pr-id": "197",
    "commit-sha": "5378cfb89c69dd73775921f929a82538d00bbdea"
  },
  {
    "project": "dns-proxy",
    "component": "gaia",
    "pr-id": "388",
    "commit-sha": "0de87689e348fe48634e9f61d3346a5718157a95"
  },
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "d4f35355fa234297f7e758a6c9fdf6f4a75b5f4e"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "9c502ed27ab4a4edaf05a9fad72169a013175668"
  },
  {
    "project": "dns-proxy",
    "component": "apotests",
    "pr-id": "2229",
    "commit-sha": "0a8330240880d6f41b4569a9ce31039438a0003d"
  },
  {
    "project": "dns-proxy",
    "component": "backend",
    "pr-id": "524",
    "commit-sha": "347460feb01c9f508ac2fc11423ceff19d7b8cf0"
  }
]
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commented Aug 30, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "901e6583bfa2242a8c066badd942cc6c06b380c1"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "bf3dfd98fbc87335470104fcca111e4d4e6bb618"
  },
  {
    "project": "dns-proxy",
    "component": "apotests",
    "pr-id": "2229",
    "commit-sha": "c40d22cd1cd1eda77e0044588e93b15716f2b778"
  },
  {
    "project": "dns-proxy",
    "component": "backend",
    "pr-id": "524",
    "commit-sha": "347460feb01c9f508ac2fc11423ceff19d7b8cf0"
  },
  {
    "project": "dns-proxy",
    "component": "apoctl",
    "pr-id": "197",
    "commit-sha": "5378cfb89c69dd73775921f929a82538d00bbdea"
  },
  {
    "project": "dns-proxy",
    "component": "gaia",
    "pr-id": "388",
    "commit-sha": "0de87689e348fe48634e9f61d3346a5718157a95"
  }
]
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commented Aug 30, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy",
    "component": "apoctl",
    "pr-id": "197",
    "commit-sha": "5378cfb89c69dd73775921f929a82538d00bbdea"
  },
  {
    "project": "dns-proxy",
    "component": "gaia",
    "pr-id": "388",
    "commit-sha": "0de87689e348fe48634e9f61d3346a5718157a95"
  },
  {
    "project": "dns-proxy",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "901e6583bfa2242a8c066badd942cc6c06b380c1"
  },
  {
    "project": "dns-proxy",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "bf3dfd98fbc87335470104fcca111e4d4e6bb618"
  },
  {
    "project": "dns-proxy",
    "component": "apotests",
    "pr-id": "2229",
    "commit-sha": "c40d22cd1cd1eda77e0044588e93b15716f2b778"
  },
  {
    "project": "dns-proxy",
    "component": "backend",
    "pr-id": "524",
    "commit-sha": "347460feb01c9f508ac2fc11423ceff19d7b8cf0"
  }
]
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commented Sep 4, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy-enforcer",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "6863d9764744bd37ef55b8df7c56bf991a8e87f9"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "cf3d294950002ecf18e36238284e28e4dedd95b4"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "apotests",
    "pr-id": "2244",
    "commit-sha": "6de86f287c45f04b87d4f849cd2588036f1717ef"
  }
]
origFlow, err := c.conn.Get(flow)

if err != nil {
zap.L().Error("")

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@primalmotion

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beautiful!

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0xmchadha Sep 4, 2019

Author Contributor

So the get function doesn’t return a pointer. Even on an error it returns the 0 object. So that code is harmless. It won’t panic. I will get rid of the empty error message there because the client is handling the error. You can look at the Get function here https://github.com/ti-mo/conntrack/blob/master/conn.go

@0xmchadha 0xmchadha force-pushed the dnsProxy branch from 6863d97 to 0ef909c Sep 4, 2019

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commented Sep 4, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy-enforcer",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "b42dccc767d4af08289e2ec53c2f107dd47c7b14"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "apotests",
    "pr-id": "2244",
    "commit-sha": "6de86f287c45f04b87d4f849cd2588036f1717ef"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "0ef909cf5828a5b6cafd890cbcca5d575d79e331"
  }
]
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commented Sep 4, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy-enforcer",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "0ef909cf5828a5b6cafd890cbcca5d575d79e331"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "b42dccc767d4af08289e2ec53c2f107dd47c7b14"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "apotests",
    "pr-id": "2244",
    "commit-sha": "6b4db898081027f1903efd61b9e3f0eed7b9344d"
  }
]
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commented Sep 4, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy-enforcer",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "0ef909cf5828a5b6cafd890cbcca5d575d79e331"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "b42dccc767d4af08289e2ec53c2f107dd47c7b14"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "apotests",
    "pr-id": "2244",
    "commit-sha": "64d6a91a5e78ce90fdd2c41f0f02294c48ce6a00"
  }
]
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commented Sep 5, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy-enforcer",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "0ef909cf5828a5b6cafd890cbcca5d575d79e331"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "b42dccc767d4af08289e2ec53c2f107dd47c7b14"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "apotests",
    "pr-id": "2244",
    "commit-sha": "86b4d2552a9af3c5d027313974860e1b52be22d9"
  }
]
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@0xmchadha

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commented Sep 5, 2019

/build - automatically fired by gogo with following PRs and commit SHAs v1.0.0

[
  {
    "project": "dns-proxy-enforcer",
    "component": "trireme-lib",
    "pr-id": "854",
    "commit-sha": "0ef909cf5828a5b6cafd890cbcca5d575d79e331"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "enforcerd",
    "pr-id": "1325",
    "commit-sha": "b42dccc767d4af08289e2ec53c2f107dd47c7b14"
  },
  {
    "project": "dns-proxy-enforcer",
    "component": "apotests",
    "pr-id": "2244",
    "commit-sha": "86b4d2552a9af3c5d027313974860e1b52be22d9"
  }
]

@0xmchadha 0xmchadha merged commit 47b3913 into master Sep 6, 2019

6 checks passed

codecov/patch 62.79% of diff hit (target 55.94%)
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codecov/project 56.03% (+0.08%) compared to 418c058
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continuous-integration/travis-ci/pr The Travis CI build passed
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continuous-integration/travis-ci/push The Travis CI build passed
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functional-tests Submitter: reason: . functional-tests set to success
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functional-tests-trigger Submitter: reason: . functional-tests-trigger set to success
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