ae769f52a1
Concurrent enroll-url launches could both pass the enrollment
marker check and run overlapping elevated installs, racing on
LoadOrExchangeAPIKey and overwriting agent.key.
Add an exclusive flock on {configDir}/enrolling.lock for the
full install path and re-check IsEnrolled under that lock so
only one install exchanges a token and configures the device.
Signed-off-by: Ludovic Vielle <ludovic@probo.com>
114 lines
3.7 KiB
Go
114 lines
3.7 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package deviceagent
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import (
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"fmt"
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"os"
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"path/filepath"
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)
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const (
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// EnrollmentRunDirMode is searchable by the user-session tray helper so
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// IsEnrolled can stat the marker without access to the secrets directory.
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EnrollmentRunDirMode = 0o755
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// EnrollmentMarkerMode is owner-only; tray detection uses os.Stat via
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// the searchable run directory, not read access to the marker contents.
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EnrollmentMarkerMode = 0o600
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// EnrollmentMarkerName is the runtime enrollment flag filename.
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EnrollmentMarkerName = "enrolled"
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)
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// EnrollmentRunDir returns the runtime directory for the public enrollment
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// marker and the short-lived enrolling.lock. Production installs use
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// DefaultEnrollmentRunDir(); custom --dir values get an isolated sibling
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// run tree for dev and tests.
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func EnrollmentRunDir(configDir string) string {
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if configDir == "" {
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configDir = DefaultConfigDir()
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}
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if configDir == DefaultConfigDir() {
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return DefaultEnrollmentRunDir()
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}
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return filepath.Join(filepath.Dir(configDir), "run", filepath.Base(configDir))
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}
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func enrollmentMarkerPath(runDir string) string {
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if runDir == "" {
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runDir = DefaultEnrollmentRunDir()
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}
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return filepath.Join(runDir, EnrollmentMarkerName)
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}
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// IsEnrolled reports whether the enrollment marker exists in runDir.
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func IsEnrolled(runDir string) (bool, error) {
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_, err := os.Stat(enrollmentMarkerPath(runDir))
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if err == nil {
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return true, nil
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}
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if os.IsNotExist(err) {
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return false, nil
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}
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return false, fmt.Errorf("cannot stat enrollment marker: %w", err)
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}
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// MarkEnrolled writes the enrollment marker under runDir.
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func MarkEnrolled(runDir string) error {
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if runDir == "" {
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runDir = DefaultEnrollmentRunDir()
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}
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if err := os.MkdirAll(runDir, EnrollmentRunDirMode); err != nil {
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return fmt.Errorf("cannot create enrollment run dir: %w", err)
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}
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if err := os.Chmod(runDir, EnrollmentRunDirMode); err != nil {
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return fmt.Errorf("cannot set enrollment run dir permissions: %w", err)
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}
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path := enrollmentMarkerPath(runDir)
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if err := os.WriteFile(path, []byte("ok\n"), EnrollmentMarkerMode); err != nil {
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return fmt.Errorf("cannot write enrollment marker: %w", err)
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}
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if err := os.Chmod(path, EnrollmentMarkerMode); err != nil {
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return fmt.Errorf("cannot set enrollment marker permissions: %w", err)
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}
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return nil
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}
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// ClearEnrollmentMarker removes the public enrollment marker from runDir.
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func ClearEnrollmentMarker(runDir string) error {
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if err := os.Remove(enrollmentMarkerPath(runDir)); err != nil && !os.IsNotExist(err) {
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return fmt.Errorf("cannot remove enrollment marker: %w", err)
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}
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return nil
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}
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