mirror of
https://github.com/safing/portmaster
synced 2025-09-02 02:29:12 +00:00
78 lines
1.8 KiB
Go
78 lines
1.8 KiB
Go
package helper
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/safing/portbase/log"
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"github.com/safing/portbase/updater"
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)
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var pmElectronUpdate *updater.File
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// EnsureChromeSandboxPermissions makes sure the chrome-sandbox distributed
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// by our app-electron package has the SUID bit set on systems that do not
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// allow unprivileged CLONE_NEWUSER (clone(3)).
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// On non-linux systems or systems that have kernel.unprivileged_userns_clone
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// set to 1 EnsureChromeSandboPermissions is a NO-OP.
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func EnsureChromeSandboxPermissions(reg *updater.ResourceRegistry) error {
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if runtime.GOOS != "linux" {
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return nil
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}
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_, err := os.Stat("/proc/self/ns/user")
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if err == nil {
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return nil
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}
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if !os.IsNotExist(err) {
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return err
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}
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// err == ENOENT
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if pmElectronUpdate != nil && !pmElectronUpdate.UpgradeAvailable() {
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return nil
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}
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identifier := PlatformIdentifier("app/portmaster-app.zip")
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log.Debug("updates: kernel support for unprivileged USERNS_CLONE disabled")
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pmElectronUpdate, err = reg.GetFile(identifier)
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if err != nil {
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return err
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}
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unpackedPath := strings.TrimSuffix(
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pmElectronUpdate.Path(),
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filepath.Ext(pmElectronUpdate.Path()),
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)
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sandboxFile := filepath.Join(unpackedPath, "chrome-sandbox")
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if err := os.Chmod(sandboxFile, 0755|os.ModeSetuid); err != nil {
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return err
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}
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log.Infof("updates: fixed SUID permission for chrome-sandbox")
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return nil
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}
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func checkSysctl(setting string, value byte) bool {
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c, err := sysctl(setting)
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if err != nil {
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return false
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}
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if len(c) < 1 {
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return false
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}
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return c[0] == value
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}
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func sysctl(setting string) ([]byte, error) {
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parts := append([]string{"/proc", "sys"}, strings.Split(setting, ".")...)
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path := filepath.Join(parts...)
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content, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, err
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}
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return content, nil
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}
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