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ipn/ipnserver, paths, logpolicy: move Window config files out of %LocalAppData%

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C:\WINDOWS\system32\config\systemprofile\AppData\Local\
is frequently cleared for almost any reason: Windows updates,
System Restore, even various System Cleaner utilities.

The server-state.conf file in AppData\Local could be deleted
at any time, which would break login until the node is removed
from the Admin Panel allowing it to create a new key.

Carefully copy any AppData state to ProgramData at startup.
If copying the state fails, continue to use AppData so at
least there will be connectivity. If there is no state,
use ProgramData.

We also migrate the log.conf file. Very old versions of
Tailscale named the EXE tailscale-ipn, so the log conf was
tailscale-ipn.log.conf and more recent versions preserved
this filename and cmdName in logs. In this migration we
always update the filename to
c:\ProgramData\Tailscale\tailscaled.log.conf

Updates https://github.com/tailscale/tailscale/issues/2856

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
This commit is contained in:
Denton Gentry
2021-09-14 19:29:07 -07:00
committed by Denton Gentry
parent aae622314e
commit 280c84e46a
5 changed files with 115 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
logpolicy/logpolicy.go
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@@ -372,15 +372,34 @@ func New(collection string) *Policy {
cfgPath := filepath.Join(dir, fmt.Sprintf("%s.log.conf", cmdName))
// The Windows service previously ran as tailscale-ipn.exe, so
// let's keep using that log base name if it exists.
if runtime.GOOS == "windows" && cmdName == "tailscaled" {
const oldCmdName = "tailscale-ipn"
oldPath := filepath.Join(dir, oldCmdName+".log.conf")
if fi, err := os.Stat(oldPath); err == nil && fi.Mode().IsRegular() {
cfgPath = oldPath
cmdName = oldCmdName
// Tailscale 1.14 and before stored state under %LocalAppData%
// (usually "C:\WINDOWS\system32\config\systemprofile\AppData\Local"
// when tailscaled.exe is running as a non-user system service).
// However it is frequently cleared for almost any reason: Windows
// updates, System Restore, even various System Cleaner utilities.
//
// The Windows service previously ran as tailscale-ipn.exe, so
// machines which ran very old versions might still have their
// log conf named %LocalAppData%\tailscale-ipn.log.conf
//
// Machines which started using Tailscale more recently will have
// %LocalAppData%\tailscaled.log.conf
//
// Attempt to migrate the log conf to C:\ProgramData\Tailscale
oldDir := filepath.Join(os.Getenv("LocalAppData"), "Tailscale")
oldPath := filepath.Join(oldDir, "tailscaled.log.conf")
if fi, err := os.Stat(oldPath); err != nil || !fi.Mode().IsRegular() {
// *Only* if tailscaled.log.conf does not exist,
// check for tailscale-ipn.log.conf
oldPathOldCmd := filepath.Join(oldDir, "tailscale-ipn.log.conf")
if fi, err := os.Stat(oldPathOldCmd); err == nil && fi.Mode().IsRegular() {
oldPath = oldPathOldCmd
}
}
cfgPath = paths.TryConfigFileMigration(oldPath, cfgPath)
}
var oldc *Config