mirror of
https://github.com/tailscale/tailscale.git
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cmd/relaynode: drop local --acl-file in favour of central packet filter.
relaynode itself is not long for this world, deprecated in favour of tailscale/tailscaled. But now that the control server supports central distribution of packet filters, let's actually take advantage of it in a final, backward compatible release of relaynode.
This commit is contained in:
Avery Pennarun
parent
77907a76a3
commit
57bbafde84
2
.gitignore
vendored
2
.gitignore
vendored
@ -1,6 +1,6 @@
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# Binaries for programs and plugins
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*~
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*.exe
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*.exe~
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*.dll
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*.so
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*.dylib
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@ -1,63 +0,0 @@
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{
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// Declare static groups of users beyond those in the identity service
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"Groups": {
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"group:eng": ["u1@example.com", "u2@example.com"]
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},
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// Declare convenient hostname aliases to use in place of IP addresses
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"Hosts": {
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"h222": "100.2.2.2"
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},
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// Access control list
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"ACLs": [
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{
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"Action": "accept",
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// Match any of several users
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"Users": ["a@example.com", "b@example.com"],
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// Match any port on h222, and port 22 of 10.1.2.3
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"Ports": ["h222:*", "10.1.2.3:22"]
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},
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{
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"Action": "accept",
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// Match any user at all
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"Users": ["*"],
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// Match port 80 on one machine, ports 53 and 5353 on a second one,
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// and ports 8000 through 8080 (a port range) on a third one.
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"Ports": ["h222:80", "10.8.8.8:53,5353", "10.2.3.4:8000-8080"]
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},
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{
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"Action": "accept",
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// Match all users in the "Admin" role (network administrators)
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"Users": ["role:Admin", "group:eng"],
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// Allow access to port 22 on all servers
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"Ports": ["*:22"]
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},
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{
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"Action": "accept",
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"Users": ["role:User"],
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// Match only windows and linux workstations (not implemented yet)
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"OS": ["windows", "linux"],
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// Only desktop machines are allowed to access this server
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"Ports": ["10.1.1.1:443"]
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},
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{
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"Action": "accept",
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"Users": ["*"],
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// Match machines which have never been authorized, or which expired.
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// (not implemented yet)
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"MachineAuth": ["unauthorized", "expired"],
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// Logged-in users on unauthorized machines can access the email server.
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// Open the TLS ports for SMTP, IMAP, and HTTP.
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"Ports": ["10.1.2.3:465", "10.1.2.3:993", "10.1.2.3:443"]
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},
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// Match absolutely everything. Comment out this section if you want
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// the above ACLs to apply.
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{ "Action": "accept", "Users": ["*"], "Ports": ["*:*"] },
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// Leave this line here so that every rule can end in a comma.
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// It has no effect since it has no matching rules.
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{"Action": "accept"}
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]
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}
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@ -1,4 +1,3 @@
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relaynode /usr/sbin
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tailscale-login /usr/sbin
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taillogin /usr/sbin
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acl.json /etc/tailscale
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@ -5,7 +5,7 @@ ConditionPathExists=/var/lib/tailscale/relay.conf
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[Service]
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EnvironmentFile=/etc/default/tailscale-relay
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ExecStart=/usr/sbin/relaynode --config=/var/lib/tailscale/relay.conf --tun=wg0 $PORT $ACL_FILE $FLAGS
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ExecStart=/usr/sbin/relaynode --config=/var/lib/tailscale/relay.conf --tun=wg0 $PORT $FLAGS
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Restart=on-failure
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[Install]
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@ -11,6 +11,7 @@ arch=$(dpkg --print-architecture)
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)
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cp -a "$S/$dir/debian" "$dir/debtmp/"
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rm -f "$dir/debtmp/debian/$package.debhelper.log"
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rm -f "$dir/${package}_${version}_${arch}.deb"
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(
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cd "$dir/debtmp" &&
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debian/rules build &&
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@ -8,7 +8,6 @@ mkdir "$outdir"
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touch $outdir/.stamp
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sfiles="
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tailscale-login
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acl.json
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debian/*.service
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*.defaults
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"
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@ -10,5 +10,6 @@ rpmbase=$HOME/rpmbuild
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mkdir -p "$rpmbase/SOURCES/"
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cp "$dir/$pkg.tar.gz" "$rpmbase/SOURCES/"
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rm -f "$rpmbase/RPMS/$machine/$pkg-$pkgver.$machine.rpm"
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rpmbuild -bb "$dir/$pkg.spec"
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mv "$rpmbase/RPMS/$machine/$pkg-$pkgver.$machine.rpm" $3
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@ -29,7 +29,6 @@
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"github.com/tailscale/wireguard-go/wgcfg"
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"tailscale.com/atomicfile"
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"tailscale.com/control/controlclient"
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"tailscale.com/control/policy"
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"tailscale.com/logpolicy"
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"tailscale.com/version"
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"tailscale.com/wgengine"
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@ -52,7 +51,6 @@ func main() {
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rroutes := getopt.BoolLong("remote-routes", 'R', "allow routing subnets to remote nodes")
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droutes := getopt.BoolLong("default-routes", 'D', "allow default route on remote node")
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routes := getopt.StringLong("routes", 0, "", "list of IP ranges this node can relay")
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aclfile := getopt.StringLong("acl-file", 0, "", "restrict traffic relaying according to json ACL file")
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debug := getopt.StringLong("debug", 0, "", "Address of debug server")
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getopt.Parse()
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if len(getopt.Args()) > 0 {
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@ -83,18 +81,11 @@ func main() {
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}
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e = wgengine.NewWatchdog(e)
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var lastacljson string
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var p *policy.Policy
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if *aclfile == "" {
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e.SetFilter(nil)
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} else {
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lastacljson = readOrFatal(*aclfile)
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p = installFilterOrFatal(e, *aclfile, lastacljson, nil)
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}
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// Default filter blocks everything, until Start() is called.
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e.SetFilter(filter.NewAllowNone())
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var lastNetMap *controlclient.NetworkMap
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var lastUserMap map[string][]filter.IP
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statusFunc := func(new controlclient.Status) {
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if new.URL != "" {
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fmt.Fprintf(os.Stderr, "To authenticate, visit:\n\n\t%s\n\n", new.URL)
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@ -122,6 +113,9 @@ func main() {
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return
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}
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log.Printf("packet filter: %v\n", m.PacketFilter)
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e.SetFilter(filter.New(m.PacketFilter))
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wgcfg, err := m.WGCfg(uflags, m.DNS)
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if err != nil {
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log.Fatalf("Error getting wg config: %v\n", err)
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@ -130,14 +124,6 @@ func main() {
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if err != nil {
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log.Fatalf("Error reconfiguring engine: %v\n", err)
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}
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lastUserMap = m.UserMap()
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if p != nil {
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matches, err := p.Expand(lastUserMap)
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if err != nil {
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log.Fatalf("Error expanding ACLs: %v\n", err)
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}
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e.SetFilter(filter.New(matches))
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}
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}
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}
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@ -203,31 +189,8 @@ func main() {
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signal.Notify(sigCh, os.Interrupt)
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signal.Notify(sigCh, syscall.SIGTERM)
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t := time.NewTicker(5 * time.Second)
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loop:
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for {
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select {
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case <-t.C:
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// For the sake of curiosity, request a status
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// update periodically.
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e.RequestStatus()
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// check if aclfile has changed.
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// TODO(apenwarr): use fsnotify instead of polling?
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if *aclfile != "" {
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json := readOrFatal(*aclfile)
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if json != lastacljson {
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logf("ACL file (%v) changed. Reloading filter.\n", *aclfile)
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lastacljson = json
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p = installFilterOrFatal(e, *aclfile, json, lastUserMap)
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}
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}
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case <-sigCh:
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logf("signal received, exiting")
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t.Stop()
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break loop
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}
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}
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<-sigCh
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logf("signal received, exiting")
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ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
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defer cancel()
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@ -267,21 +230,6 @@ func readOrFatal(filename string) string {
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return string(b)
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}
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func installFilterOrFatal(e wgengine.Engine, filename, acljson string, usermap map[string][]filter.IP) *policy.Policy {
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p, err := policy.Parse(acljson)
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if err != nil {
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log.Fatalf("%v: json filter: %v\n", filename, err)
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}
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matches, err := p.Expand(usermap)
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if err != nil {
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log.Fatalf("%v: json filter: %v\n", filename, err)
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}
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e.SetFilter(filter.New(matches))
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return p
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}
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func runDebugServer(addr string) {
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mux := http.NewServeMux()
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mux.HandleFunc("/debug/pprof/", pprof.Index)
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@ -4,11 +4,5 @@
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# settings.
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PORT="--port=41641"
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# Comment out this line to allow all traffic to be relayed.
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# Or edit the given file to allow specific traffic.
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# The example file is unlikely to match any users on your network, so it
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# will block all incoming traffic by default.
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ACL_FILE="--acl-file=/etc/tailscale/acl.json"
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# Extra flags you might want to pass to relaynode.
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FLAGS=""
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@ -28,14 +28,12 @@ mkdir -p $D/usr/sbin $D/lib/systemd/system $D/etc/default $D/etc/tailscale
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cp taillogin tailscale-login relaynode $D/usr/sbin
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cp tailscale-relay.service $D/lib/systemd/system/
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cp tailscale-relay.defaults $D/etc/default/tailscale-relay
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cp acl.json $D/etc/tailscale/acl.json
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%clean
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%files
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%defattr(-,root,root)
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%config(noreplace) /etc/default/tailscale-relay
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%config(noreplace) /etc/tailscale/acl.json
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/lib/systemd/system/tailscale-relay.service
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/usr/sbin/taillogin
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/usr/sbin/tailscale-login
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@ -1,228 +0,0 @@
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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package policy
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import (
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"bytes"
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"errors"
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"fmt"
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"net"
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"strconv"
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"strings"
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"github.com/tailscale/hujson"
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"tailscale.com/wgengine/filter"
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)
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type IP = filter.IP
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const IPAny = filter.IPAny
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type row struct {
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Action string
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Users []string
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Ports []string
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}
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type Policy struct {
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ACLs []row
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Groups map[string][]string
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Hosts map[string]IP
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}
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func lineAndColumn(b []byte, ofs int64) (line, col int) {
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line = 1
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for _, c := range b[:ofs] {
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if c == '\n' {
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col = 1
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line++
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} else {
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col++
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}
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}
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return line, col
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}
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func betterUnmarshal(b []byte, obj interface{}) error {
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bio := bytes.NewReader(b)
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d := hujson.NewDecoder(bio)
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d.DisallowUnknownFields()
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err := d.Decode(obj)
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if err != nil {
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switch ee := err.(type) {
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case *hujson.SyntaxError:
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row, col := lineAndColumn(b, ee.Offset)
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return fmt.Errorf("line %d col %d: %v", row, col, ee)
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default:
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return fmt.Errorf("parser: %v", err)
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}
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}
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return nil
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}
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func Parse(acljson string) (*Policy, error) {
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p := &Policy{}
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err := betterUnmarshal([]byte(acljson), p)
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if err != nil {
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return nil, err
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}
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// Check syntax with an empty usermap to start with.
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// The caller might not have a valid usermap at startup, but we still
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// want to check that the acljson doesn't have any syntax errors
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// as early as possible. When the usermap updates later, it won't
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// add any new syntax errors.
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//
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// TODO(apenwarr): change unmarshal code to detect syntax errors above.
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// Right now some of the sub-objects aren't parsed until .Expand().
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emptyUserMap := make(map[string][]IP)
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_, err = p.Expand(emptyUserMap)
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if err != nil {
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return nil, err
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}
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return p, nil
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}
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func parseHostPortRange(hostport string) (host string, ports []filter.PortRange, err error) {
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hl := strings.Split(hostport, ":")
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if len(hl) != 2 {
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return "", nil, errors.New("hostport must have exactly one colon(:)")
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}
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host = hl[0]
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portlist := hl[1]
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if portlist == "*" {
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// Special case: permit hostname:* as a port wildcard.
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ports = append(ports, filter.PortRangeAny)
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return host, ports, nil
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}
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pl := strings.Split(portlist, ",")
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for _, pp := range pl {
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if len(pp) == 0 {
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return "", nil, fmt.Errorf("invalid port list: %#v", portlist)
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}
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pr := strings.Split(pp, "-")
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if len(pr) > 2 {
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return "", nil, fmt.Errorf("port range %#v: too many dashes(-)", pp)
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}
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var first, last uint64
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first, err := strconv.ParseUint(pr[0], 10, 16)
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if err != nil {
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return "", nil, fmt.Errorf("port range %#v: invalid first integer", pp)
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}
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if len(pr) >= 2 {
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last, err = strconv.ParseUint(pr[1], 10, 16)
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if err != nil {
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return "", nil, fmt.Errorf("port range %#v: invalid last integer", pp)
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}
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} else {
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last = first
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}
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if first == 0 {
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return "", nil, fmt.Errorf("port range %#v: first port must be >0, or use '*' for wildcard", pp)
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}
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if first > last {
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return "", nil, fmt.Errorf("port range %#v: first port must be >= last port", pp)
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}
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ports = append(ports, filter.PortRange{uint16(first), uint16(last)})
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}
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return host, ports, nil
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}
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func (p *Policy) Expand(usermap map[string][]IP) (filter.Matches, error) {
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lcusermap := make(map[string][]IP)
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for k, v := range usermap {
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k = strings.ToLower(k)
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lcusermap[k] = v
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}
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for k, userlist := range p.Groups {
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k = strings.ToLower(k)
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if !strings.HasPrefix(k, "group:") {
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return nil, fmt.Errorf("group[%#v]: group names must start with 'group:'", k)
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}
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for _, u := range userlist {
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uips := lcusermap[u]
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lcusermap[k] = append(lcusermap[k], uips...)
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}
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}
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hosts := p.Hosts
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var out filter.Matches
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for _, acl := range p.ACLs {
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if acl.Action != "accept" {
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return nil, fmt.Errorf("action=%#v is not supported", acl.Action)
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}
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var srcs []IP
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for _, user := range acl.Users {
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user = strings.ToLower(user)
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if user == "*" {
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srcs = append(srcs, IPAny)
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continue
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} else if strings.Contains(user, "@") ||
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strings.HasPrefix(user, "role:") ||
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strings.HasPrefix(user, "group:") {
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// fine if the requested user doesn't exist.
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// we don't want to crash ACL parsing just
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// because a previously authed user gets
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// deleted. We'll silently ignore it and
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// no firewall rules are needed.
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// TODO(apenwarr): maybe print a warning?
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for _, ip := range lcusermap[user] {
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if ip != IPAny {
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srcs = append(srcs, ip)
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}
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}
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} else {
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return nil, fmt.Errorf("wgengine/filter: invalid username: %q: needs '@domain' or 'group:' or 'role:'", user)
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}
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}
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var dsts []filter.IPPortRange
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for _, hostport := range acl.Ports {
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host, ports, err := parseHostPortRange(hostport)
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if err != nil {
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return nil, fmt.Errorf("ports=%#v: %v", hostport, err)
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}
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ip := net.ParseIP(host)
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ipv, ok := hosts[host]
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if ok {
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// matches an alias; ipv is now valid
|
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} else if ip != nil && ip.IsUnspecified() {
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// For clarity, reject 0.0.0.0 as an input
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return nil, fmt.Errorf("ports=%#v: to allow all IP addresses, use *:port, not 0.0.0.0:port", hostport)
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} else if ip == nil && host == "*" {
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// User explicitly requested wildcard dst ip
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ipv = IPAny
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} else {
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if ip != nil {
|
||||
ip = ip.To4()
|
||||
}
|
||||
if ip == nil || len(ip) != 4 {
|
||||
return nil, fmt.Errorf("ports=%#v: %#v: invalid IPv4 address", hostport, host)
|
||||
}
|
||||
ipv = filter.NewIP(ip)
|
||||
}
|
||||
|
||||
for _, pr := range ports {
|
||||
dsts = append(dsts, filter.IPPortRange{ipv, pr})
|
||||
}
|
||||
}
|
||||
|
||||
out = append(out, filter.Match{DstPorts: dsts, SrcIPs: srcs})
|
||||
}
|
||||
return out, nil
|
||||
}
|
||||
@ -1,156 +0,0 @@
|
||||
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package policy
|
||||
|
||||
import (
|
||||
"testing"
|
||||
|
||||
"github.com/google/go-cmp/cmp"
|
||||
"tailscale.com/wgengine/filter"
|
||||
)
|
||||
|
||||
type PortRange = filter.PortRange
|
||||
type IPPortRange = filter.IPPortRange
|
||||
|
||||
var syntax_errors = []string{
|
||||
`{ "ACLs": []! }`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "xPorts": ["100.122.98.50:22"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "drop", "Users": [], "Ports": ["100.122.98.50:22"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Users": [], "Ports": ["100.122.98.50:22"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["1.2.3.4"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["1.2.3.4:0"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["0.0.0.0:12"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["*:0"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["1.2.3.4:5:6"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["1.2.3.4.5:12"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["1.2.3.4::12"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["1.2.3.4"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["1.2.3.4:0-0"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["1.2.3.4:1-10,2-"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["1.2.3.4:1-10,*"]}
|
||||
]}`,
|
||||
|
||||
`{ "ACLs": [
|
||||
{"Action": "accept", "Users": [], "Ports": ["1.2.3.4,5.6.7.8:1-10"]}
|
||||
]}`,
|
||||
|
||||
`{ "Hosts": {"mailserver": "not-an-ip"} }`,
|
||||
|
||||
`{ "Hosts": {"mailserver": "1.2.3.4:55"} }`,
|
||||
|
||||
`{ "xGroups": {
|
||||
"bob": ["user1", "user2"]
|
||||
}}`,
|
||||
}
|
||||
|
||||
func TestSyntaxErrors(t *testing.T) {
|
||||
for _, s := range syntax_errors {
|
||||
_, err := Parse(s)
|
||||
if err == nil {
|
||||
t.Fatalf("Parse passed when it shouldn't. json:\n---\n%v\n---", s)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func ippr(ip IP, start, end uint16) []IPPortRange {
|
||||
return []IPPortRange{
|
||||
IPPortRange{ip, PortRange{start, end}},
|
||||
}
|
||||
}
|
||||
|
||||
func TestPolicy(t *testing.T) {
|
||||
// Check ACL table parsing
|
||||
|
||||
usermap := map[string][]IP{
|
||||
"A@b.com": []IP{0x08010101, 0x08020202},
|
||||
"role:admin": []IP{0x02020202},
|
||||
"user1@org": []IP{0x99010101, 0x99010102},
|
||||
// user2 is intentionally missing
|
||||
"user3@org": []IP{0x99030303},
|
||||
"user4@org": []IP{},
|
||||
}
|
||||
want := filter.Matches{
|
||||
{SrcIPs: []IP{0x08010101, 0x08020202}, DstPorts: []IPPortRange{
|
||||
IPPortRange{0x01020304, PortRange{22, 22}},
|
||||
IPPortRange{0x05060708, PortRange{23, 24}},
|
||||
IPPortRange{0x05060708, PortRange{27, 28}},
|
||||
}},
|
||||
{SrcIPs: []IP{0x02020202}, DstPorts: ippr(0x08010101, 22, 22)},
|
||||
{SrcIPs: []IP{0}, DstPorts: []IPPortRange{
|
||||
IPPortRange{0x647a6232, PortRange{0, 65535}},
|
||||
IPPortRange{0, PortRange{443, 443}},
|
||||
}},
|
||||
{SrcIPs: []IP{0x99010101, 0x99010102, 0x99030303}, DstPorts: ippr(0x01020304, 999, 999)},
|
||||
}
|
||||
|
||||
p, err := Parse(`
|
||||
{
|
||||
// Test comment
|
||||
"Hosts": {
|
||||
"h1": "1.2.3.4", /* test comment */
|
||||
"h2": "5.6.7.8"
|
||||
},
|
||||
"Groups": {
|
||||
"group:eng": ["user1@org", "user2@org", "user3@org", "user4@org"]
|
||||
},
|
||||
"ACLs": [
|
||||
{"Action": "accept", "Users": ["a@b.com"], "Ports": ["h1:22", "h2:23-24,27-28"]},
|
||||
{"Action": "accept", "Users": ["role:Admin"], "Ports": ["8.1.1.1:22"]},
|
||||
{"Action": "accept", "Users": ["*"], "Ports": ["100.122.98.50:*", "*:443"]},
|
||||
{"Action": "accept", "Users": ["group:eng"], "Ports": ["h1:999"]},
|
||||
]}
|
||||
`)
|
||||
if err != nil {
|
||||
t.Fatalf("Parse failed: %v", err)
|
||||
}
|
||||
matches, err := p.Expand(usermap)
|
||||
if err != nil {
|
||||
t.Fatalf("Expand failed: %v", err)
|
||||
}
|
||||
if diff := cmp.Diff(want, matches); diff != "" {
|
||||
t.Fatalf("Expand mismatch (-want +got):\n%s", diff)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user