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client/web: simply csrf key caching in cgi mode

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Instead of trying to use the user config dir, and then fail back to the
OS temp dir, just always use the temp dir. Also use a filename that is
less likely to cause collisions.

This addresses an issue on a test synology instance that was
mysteriously failing because there was a file at /tmp/tailscale. We
could still technically run into this issue if a
/tmp/tailscale-web-csrf.key file exists, but that seems far less likely.

Updates tailscale/corp#13775

Signed-off-by: Will Norris <will@tailscale.com>
This commit is contained in:
Will Norris 2023-08-30 11:20:02 -07:00 committed by Will Norris
parent f5bfdefa00
commit 37eab31f68
1 changed files with 1 additions and 10 deletions
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11
client/web/web.go
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@ -456,16 +456,10 @@ func (s *Server) proxyRequestToLocalAPI(w http.ResponseWriter, r *http.Request)
// If the server is running in CGI mode, the key is cached to disk and reused between requests.
// If an error occurs during key storage, the error is logged and the active process terminated.
func (s *Server) csrfKey() []byte {
var csrfFile string
csrfFile := filepath.Join(os.TempDir(), "tailscale-web-csrf.key")
// if running in CGI mode, try to read from disk, but ignore errors
if s.cgiMode {
confdir, err := os.UserConfigDir()
if err != nil {
confdir = os.TempDir()
}
csrfFile = filepath.Join(confdir, "tailscale", "web-csrf.key")
key, _ := os.ReadFile(csrfFile)
if len(key) == 32 {
return key
@ -480,9 +474,6 @@ func (s *Server) csrfKey() []byte {
// if running in CGI mode, try to write the newly created key to disk, and exit if it fails.
if s.cgiMode {
if err := os.Mkdir(filepath.Dir(csrfFile), 0700); err != nil && !os.IsExist(err) {
log.Fatalf("unable to store CSRF key: %v", err)
}
if err := os.WriteFile(csrfFile, key, 0600); err != nil {
log.Fatalf("unable to store CSRF key: %v", err)
}