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ipn/ipnlocal,net/tstun,wgengine: create and plumb jailed packet filter

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This plumbs a packet filter for jailed nodes through to the
tstun.Wrapper; the filter for a jailed node is equivalent to a "shields
up" filter. Currently a no-op as there is no way for control to
tell the client whether a peer is jailed.

Updates tailscale/corp#19623

Co-authored-by: Andrew Dunham <andrew@du.nham.ca>
Signed-off-by: Maisem Ali <maisem@tailscale.com>
Change-Id: I5ccc5f00e197fde15dd567485b2a99d8254391ad
This commit is contained in:
Maisem Ali
2024-05-06 11:09:10 -07:00
committed by Maisem Ali
parent f62e678df8
commit e67069550b
5 changed files with 87 additions and 5 deletions
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11
ipn/ipnlocal/local.go
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@@ -440,7 +440,9 @@ func NewLocalBackend(logf logger.Logf, logID logid.PublicID, sys *tsd.System, lo
}
// Default filter blocks everything and logs nothing, until Start() is called.
b.setFilter(filter.NewAllowNone(logf, &netipx.IPSet{}))
noneFilter := filter.NewAllowNone(logf, &netipx.IPSet{})
b.setFilter(noneFilter)
b.e.SetJailedFilter(noneFilter)
b.setTCPPortsIntercepted(nil)
@@ -1935,7 +1937,9 @@ func (b *LocalBackend) updateFilterLocked(netMap *netmap.NetworkMap, prefs ipn.P
if !haveNetmap {
b.logf("[v1] netmap packet filter: (not ready yet)")
b.setFilter(filter.NewAllowNone(b.logf, logNets))
noneFilter := filter.NewAllowNone(b.logf, logNets)
b.setFilter(noneFilter)
b.e.SetJailedFilter(noneFilter)
return
}
@@ -1947,6 +1951,9 @@ func (b *LocalBackend) updateFilterLocked(netMap *netmap.NetworkMap, prefs ipn.P
b.logf("[v1] netmap packet filter: %v filters", len(packetFilter))
b.setFilter(filter.New(packetFilter, localNets, logNets, oldFilter, b.logf))
}
// The filter for a jailed node is the exact same as a ShieldsUp filter.
oldJailedFilter := b.e.GetJailedFilter()
b.e.SetJailedFilter(filter.NewShieldsUpFilter(localNets, logNets, oldJailedFilter, b.logf))
if b.sshServer != nil {
go b.sshServer.OnPolicyChange()