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client/web: add some security checks for full client

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Require that requests to servers in manage mode are made to the
Tailscale IP (either ipv4 or ipv6) or quad-100. Also set various
security headers on those responses.  These might be too restrictive,
but we can relax them as needed.

Allow requests to /ok (even in manage mode) with no checks. This will be
used for the connectivity check from a login client to see if the
management client is reachable.

Updates tailscale/corp#14335

Signed-off-by: Will Norris <will@tailscale.com>
This commit is contained in:
Will Norris
2023-11-02 20:05:40 -07:00
committed by Will Norris
parent fbc18410ad
commit 6b956b49e0
5 changed files with 161 additions and 4 deletions
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4
ipn/ipnlocal/local.go
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@@ -3132,7 +3132,7 @@ func (b *LocalBackend) TCPHandlerForDst(src, dst netip.AddrPort) (handler func(c
return b.handleSSHConn, opts
}
// TODO(will,sonia): allow customizing web client port ?
if dst.Port() == 5252 && b.ShouldRunWebClient() {
if dst.Port() == webClientPort && b.ShouldRunWebClient() {
return b.handleWebClientConn, opts
}
if port, ok := b.GetPeerAPIPort(dst.Addr()); ok && dst.Port() == port {
@@ -4474,7 +4474,7 @@ func (b *LocalBackend) setTCPPortsInterceptedFromNetmapAndPrefsLocked(prefs ipn.
handlePorts = append(handlePorts, 22)
}
if b.ShouldRunWebClient() {
handlePorts = append(handlePorts, 5252)
handlePorts = append(handlePorts, webClientPort)
}
b.reloadServeConfigLocked(prefs)