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ipnlocal: log failure to get ssh host keys

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When reporting ssh host keys to control, log a warning
if we're unable to get the SSH host keys.

Updates tailscale/escalations#21

Signed-off-by: Percy Wegmann <percy@tailscale.com>
This commit is contained in:
Percy Wegmann 2024-01-30 15:49:02 -06:00 committed by Percy Wegmann
parent 9744ad47e3
commit fad6bae764
3 changed files with 16 additions and 8 deletions
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6
ipn/ipnlocal/local.go
View File

@ -4125,7 +4125,11 @@ func (b *LocalBackend) applyPrefsToHostinfoLocked(hi *tailcfg.Hostinfo, prefs ip
// TODO(bradfitz): this is called with b.mu held. Not ideal.
// If the filesystem gets wedged or something we could block for
// a long time. But probably fine.
sshHostKeys = b.getSSHHostKeyPublicStrings()
var err error
sshHostKeys, err = b.getSSHHostKeyPublicStrings()
if err != nil {
b.logf("warning: unable to get SSH host keys, SSH will appear as disabled for this node: %v", err)
}
}
hi.SSH_HostKeys = sshHostKeys

14
ipn/ipnlocal/ssh.go
View File

@ -210,12 +210,16 @@ func (b *LocalBackend) getSystemSSH_HostKeys() (ret map[string]ssh.Signer) {
return ret
}
func (b *LocalBackend) getSSHHostKeyPublicStrings() (ret []string) {
signers, _ := b.GetSSH_HostKeys()
for _, signer := range signers {
ret = append(ret, strings.TrimSpace(string(ssh.MarshalAuthorizedKey(signer.PublicKey()))))
func (b *LocalBackend) getSSHHostKeyPublicStrings() ([]string, error) {
signers, err := b.GetSSH_HostKeys()
if err != nil {
return nil, err
}
return ret
var keyStrings []string
for _, signer := range signers {
keyStrings = append(keyStrings, strings.TrimSpace(string(ssh.MarshalAuthorizedKey(signer.PublicKey()))))
}
return keyStrings, nil
}
// tailscaleSSHEnabled reports whether Tailscale SSH is currently enabled based

4
ipn/ipnlocal/ssh_stub.go
View File

@ -11,8 +11,8 @@
"tailscale.com/tailcfg"
)
func (b *LocalBackend) getSSHHostKeyPublicStrings() []string {
return nil
func (b *LocalBackend) getSSHHostKeyPublicStrings() ([]string, error) {
return nil, nil
}
func (b *LocalBackend) getSSHUsernames(*tailcfg.C2NSSHUsernamesRequest) (*tailcfg.C2NSSHUsernamesResponse, error) {