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cmd/tailscale/cli, ipn/ipnlocal: give SSH tips when off/unconfigured

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Updates #3802

Change-Id: I6b9a3175f68a6daa670f912561f2c2ececc07770
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
(cherry picked from commit 467eb2eca0)
This commit is contained in:
Brad Fitzpatrick 2022-06-17 12:09:23 -07:00
parent c1795c6af9
commit 32f26a723b
2 changed files with 104 additions and 24 deletions
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30
cmd/tailscale/cli/up.go
View File

@ -404,7 +404,7 @@ func updatePrefs(prefs, curPrefs *ipn.Prefs, env upCheckEnv) (simpleUp bool, jus
return simpleUp, justEditMP, nil
}
func runUp(ctx context.Context, args []string) error {
func runUp(ctx context.Context, args []string) (retErr error) {
if len(args) > 0 {
fatalf("too many non-flag arguments: %q", args)
}
@ -481,6 +481,12 @@ func runUp(ctx context.Context, args []string) error {
}
}
defer func() {
if retErr == nil {
checkSSHUpWarnings(ctx)
}
}()
simpleUp, justEditMP, err := updatePrefs(prefs, curPrefs, env)
if err != nil {
fatalf("%s", err)
@ -676,6 +682,28 @@ func runUp(ctx context.Context, args []string) error {
}
}
func checkSSHUpWarnings(ctx context.Context) {
if !upArgs.runSSH {
return
}
st, err := localClient.Status(ctx)
if err != nil {
// Ignore. Don't spam more.
return
}
if len(st.Health) == 0 {
return
}
if len(st.Health) == 1 && strings.Contains(st.Health[0], "SSH") {
printf("%s\n", st.Health[0])
return
}
printf("# Health check:\n")
for _, m := range st.Health {
printf(" - %s\n", m)
}
}
func printUpDoneJSON(state ipn.State, errorString string) {
js := &upOutputJSON{BackendState: state.String(), Error: errorString}
data, err := json.MarshalIndent(js, "", " ")

62
ipn/ipnlocal/local.go
View File

@ -416,6 +416,9 @@ func (b *LocalBackend) updateStatus(sb *ipnstate.StatusBuilder, extraLocked func
s.Health = append(s.Health, err.Error())
}
}
if m := b.sshOnButUnusableHealthCheckMessageLocked(); m != "" {
s.Health = append(s.Health, m)
}
if b.netMap != nil {
s.CertDomains = append([]string(nil), b.netMap.DNS.CertDomains...)
s.MagicDNSSuffix = b.netMap.MagicDNSSuffix()
@ -1826,11 +1829,21 @@ func (b *LocalBackend) CheckPrefs(p *ipn.Prefs) error {
}
func (b *LocalBackend) checkPrefsLocked(p *ipn.Prefs) error {
var errs []error
if p.Hostname == "badhostname.tailscale." {
// Keep this one just for testing.
return errors.New("bad hostname [test]")
errs = append(errs, errors.New("bad hostname [test]"))
}
if err := b.checkSSHPrefsLocked(p); err != nil {
errs = append(errs, err)
}
return multierr.New(errs...)
}
func (b *LocalBackend) checkSSHPrefsLocked(p *ipn.Prefs) error {
if !p.RunSSH {
return nil
}
if p.RunSSH {
switch runtime.GOOS {
case "linux":
if distro.Get() == distro.Synology && !envknob.UseWIPCode() {
@ -1851,14 +1864,53 @@ func (b *LocalBackend) checkPrefsLocked(p *ipn.Prefs) error {
if !canSSH {
return errors.New("The Tailscale SSH server has been administratively disabled.")
}
if b.netMap != nil && b.netMap.SSHPolicy == nil &&
envknob.SSHPolicyFile() == "" && !envknob.SSHIgnoreTailnetPolicy() {
return errors.New("Unable to enable local Tailscale SSH server; not enabled/configured on Tailnet.")
if envknob.SSHIgnoreTailnetPolicy() || envknob.SSHPolicyFile() != "" {
return nil
}
if b.netMap != nil {
if !hasCapability(b.netMap, tailcfg.CapabilitySSH) {
if b.isDefaultServerLocked() {
return errors.New("Unable to enable local Tailscale SSH server; not enabled on Tailnet. See https://tailscale.com/s/ssh")
}
return errors.New("Unable to enable local Tailscale SSH server; not enabled on Tailnet.")
}
}
return nil
}
func (b *LocalBackend) sshOnButUnusableHealthCheckMessageLocked() (healthMessage string) {
if b.prefs == nil || !b.prefs.RunSSH {
return ""
}
if envknob.SSHIgnoreTailnetPolicy() || envknob.SSHPolicyFile() != "" {
return "development SSH policy in use"
}
nm := b.netMap
if nm == nil {
return ""
}
if nm.SSHPolicy != nil && len(nm.SSHPolicy.Rules) > 0 {
return ""
}
isDefault := b.isDefaultServerLocked()
isAdmin := hasCapability(nm, tailcfg.CapabilityAdmin)
if !isAdmin {
return "Tailscale SSH enabled, but access controls don't allow anyone to access this device. Ask your admin to update your tailnet's ACLs to allow access."
}
if !isDefault {
return "Tailscale SSH enabled, but access controls don't allow anyone to access this device. Update your tailnet's ACLs to allow access."
}
return "Tailscale SSH enabled, but access controls don't allow anyone to access this device. Update your tailnet's ACLs at https://tailscale.com/s/ssh-policy"
}
func (b *LocalBackend) isDefaultServerLocked() bool {
if b.prefs == nil {
return true // assume true until set otherwise
}
return b.prefs.ControlURLOrDefault() == ipn.DefaultControlURL
}
func (b *LocalBackend) EditPrefs(mp *ipn.MaskedPrefs) (*ipn.Prefs, error) {
b.mu.Lock()
p0 := b.prefs.Clone()