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util/linuxfw: add missing input rule to the tailscale tun

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Add an explicit accept rule for input to the tun interface, as a mirror
to the explicit rule to accept output from the tun interface.

The rule matches any packet in to our tun interface and accepts it, and
the rule is positioned and prioritized such that it should be evaluated
prior to conventional ufw/iptables/nft rules.

Updates #391
Fixes #7332
Updates #9084

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2023-08-24 18:15:03 -07:00
committed by James Tucker
parent 677d486830
commit ba6ec42f6d
4 changed files with 89 additions and 1 deletions
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14
util/linuxfw/iptables_runner.go
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@@ -254,6 +254,12 @@ func (i *iptablesRunner) addBase4(tunname string) error {
return fmt.Errorf("adding %v in v4/filter/ts-input: %w", args, err)
}
// Explicitly allow all other inbound traffic to the tun interface
args = []string{"-i", tunname, "-j", "ACCEPT"}
if err := i.ipt4.Append("filter", "ts-input", args...); err != nil {
return fmt.Errorf("adding %v in v4/filter/ts-input: %w", args, err)
}
// Forward all traffic from the Tailscale interface, and drop
// traffic to the tailscale interface by default. We use packet
// marks here so both filter/FORWARD and nat/POSTROUTING can match
@@ -291,7 +297,13 @@ func (i *iptablesRunner) addBase6(tunname string) error {
// TODO: only allow traffic from Tailscale's ULA range to come
// from tailscale0.
args := []string{"-i", tunname, "-j", "MARK", "--set-mark", TailscaleSubnetRouteMark + "/" + TailscaleFwmarkMask}
// Explicitly allow all other inbound traffic to the tun interface
args := []string{"-i", tunname, "-j", "ACCEPT"}
if err := i.ipt6.Append("filter", "ts-input", args...); err != nil {
return fmt.Errorf("adding %v in v6/filter/ts-input: %w", args, err)
}
args = []string{"-i", tunname, "-j", "MARK", "--set-mark", TailscaleSubnetRouteMark + "/" + TailscaleFwmarkMask}
if err := i.ipt6.Append("filter", "ts-forward", args...); err != nil {
return fmt.Errorf("adding %v in v6/filter/ts-forward: %w", args, err)
}