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ssh/tailssh: move SSH code from wgengine/netstack to this new package

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Still largely incomplete, but in a better home now.

Updates #3802

Change-Id: I46c5ffdeb12e306879af801b06266839157bc624
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-02-15 11:59:21 -08:00
committed by Brad Fitzpatrick
parent 6d02a48d8d
commit 1b87e025e9
4 changed files with 173 additions and 148 deletions
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23
wgengine/netstack/netstack.go
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@@ -103,9 +103,9 @@ type Impl struct {
connsOpenBySubnetIP map[netaddr.IP]int
}
// sshDemo is initialized in ssh.go (on Linux only) to register an SSH server
// handleSSH is initialized in ssh.go (on Linux only) to register an SSH server
// handler. See https://github.com/tailscale/tailscale/issues/3802.
var sshDemo func(*Impl, net.Conn) error
var handleSSH func(logger.Logf, *ipnlocal.LocalBackend, net.Conn) error
const nicID = 1
const mtu = 1500
@@ -638,17 +638,16 @@ func (ns *Impl) acceptTCP(r *tcp.ForwarderRequest) {
// block until the TCP handshake is complete.
c := gonet.NewTCPConn(&wq, ep)
if reqDetails.LocalPort == 22 && ns.processSSH() && ns.isLocalIP(dialIP) && sshDemo != nil {
// TODO(bradfitz): un-demo this.
ns.logf("doing ssh demo thing....")
if err := sshDemo(ns, c); err != nil {
ns.logf("ssh demo error: %v", err)
} else {
ns.logf("ssh demo: ok")
}
return
}
if ns.lb != nil {
if reqDetails.LocalPort == 22 && ns.processSSH() && ns.isLocalIP(dialIP) && handleSSH != nil {
ns.logf("handling SSH connection....")
if err := handleSSH(ns.logf, ns.lb, c); err != nil {
ns.logf("ssh error: %v", err)
} else {
ns.logf("ssh: ok")
}
return
}
if port, ok := ns.lb.GetPeerAPIPort(dialIP); ok {
if reqDetails.LocalPort == port && ns.isLocalIP(dialIP) {
src := netaddr.IPPortFrom(clientRemoteIP, reqDetails.RemotePort)