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|
//go:build !windows
// +build !windows
package preflight
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"runtime"
"syscall"
"github.com/crc-org/crc/v2/pkg/crc/cache"
"github.com/crc-org/crc/v2/pkg/crc/constants"
"github.com/crc-org/crc/v2/pkg/crc/logging"
crcpreset "github.com/crc-org/crc/v2/pkg/crc/preset"
"github.com/crc-org/crc/v2/pkg/crc/version"
crcos "github.com/crc-org/crc/v2/pkg/os"
"github.com/pkg/errors"
)
var nonWinPreflightChecks = []Check{
{
configKeySuffix: "check-root-user",
checkDescription: "Checking if running as non-root",
check: checkIfRunningAsNormalUser,
fixDescription: "crc should not be run as root",
flags: NoFix,
// no need for an "os" label as this is only built on relevant OSes through the use of golang build tags
labels: None,
},
}
func genericPreflightChecks(_ crcpreset.Preset) []Check {
return []Check{
{
configKeySuffix: "check-admin-helper-cached",
checkDescription: "Checking if crc-admin-helper executable is cached",
check: checkAdminHelperExecutableCached,
fixDescription: "Caching crc-admin-helper executable",
fix: fixAdminHelperExecutableCached,
labels: None,
},
{
configKeySuffix: "check-supported-cpu-arch",
checkDescription: "Checking if running on a supported CPU architecture",
check: checkSupportedCPUArch,
fixDescription: "CRC is only supported on AMD64/Intel64 hardware",
flags: NoFix,
labels: None,
},
{
configKeySuffix: "check-crc-symlink",
checkDescription: "Checking if crc executable symlink exists",
check: checkCrcSymlink,
fixDescription: "Creating symlink for crc executable",
fix: fixCrcSymlink,
cleanupDescription: "Removing crc executable symlink",
cleanup: removeCrcSymlink,
labels: None,
},
}
}
func checkIfRunningAsNormalUser() error {
if os.Geteuid() != 0 {
return nil
}
logging.Debug("Ran as root")
return errors.New("crc should not be run as root")
}
func setSuid(path string) error {
logging.Debugf("Making %s suid", path)
stdOut, stdErr, err := crcos.RunPrivileged(fmt.Sprintf("Changing ownership of %s", path), "chown", "root", path)
if err != nil {
return fmt.Errorf("Unable to set ownership of %s to root: %s %v: %s",
path, stdOut, err, stdErr)
}
/* Can't do this before the chown as the chown will reset the suid bit */
stdOut, stdErr, err = crcos.RunPrivileged(fmt.Sprintf("Setting suid for %s", path), "chmod", "u+s,g+x", path)
if err != nil {
return fmt.Errorf("Unable to set suid bit on %s: %s %v: %s", path, stdOut, err, stdErr)
}
return nil
}
func checkSuid(path string) error {
fi, err := os.Stat(path)
if err != nil {
return err
}
if fi.Mode()&os.ModeSetuid == 0 {
return fmt.Errorf("%s does not have the SUID bit set (%s)", path, fi.Mode().String())
}
if fi.Sys().(*syscall.Stat_t).Uid != 0 {
return fmt.Errorf("%s is not owned by root", path)
}
return nil
}
// Check if helper executable is cached or not
func checkAdminHelperExecutableCached() error {
if version.IsInstaller() {
return nil
}
helper := cache.NewAdminHelperCache()
if !helper.IsCached() {
return errors.New("crc-admin-helper executable is not cached")
}
if err := helper.CheckVersion(); err != nil {
return errors.Wrap(err, "unexpected version of the crc-admin-helper executable")
}
logging.Debug("crc-admin-helper executable already cached")
return checkSuid(helper.GetExecutablePath())
}
func fixAdminHelperExecutableCached() error {
if version.IsInstaller() {
return nil
}
helper := cache.NewAdminHelperCache()
if err := helper.EnsureIsCached(); err != nil {
return errors.Wrap(err, "Unable to download crc-admin-helper executable")
}
logging.Debug("crc-admin-helper executable cached")
return setSuid(helper.GetExecutablePath())
}
func checkSupportedCPUArch() error {
logging.Debugf("GOARCH is %s GOOS is %s", runtime.GOARCH, runtime.GOOS)
// Only supported arches are amd64, and arm64 on macOS
if runtime.GOARCH == "amd64" || (runtime.GOARCH == "arm64" && runtime.GOOS == "darwin") {
return nil
}
return fmt.Errorf("CRC can only run on AMD64/Intel64 CPUs and Apple silicon")
}
func runtimeExecutablePath() (string, error) {
path, err := exec.LookPath(os.Args[0])
if err != nil {
// os.Args[0] is not in $PATH, crc must have been started by specifying the path to its binary
path = os.Args[0]
}
path, err = filepath.Abs(path)
if err != nil {
return "", err
}
return filepath.EvalSymlinks(path)
}
func checkCrcSymlink() error {
runtimePath, err := runtimeExecutablePath()
if err != nil {
return err
}
symlinkPath, err := filepath.EvalSymlinks(constants.CrcSymlinkPath)
if err != nil {
return err
}
if symlinkPath != runtimePath {
return fmt.Errorf("%s points to %s, not to %s", constants.CrcSymlinkPath, symlinkPath, runtimePath)
}
return nil
}
func fixCrcSymlink() error {
_ = os.Remove(constants.CrcSymlinkPath)
runtimePath, err := runtimeExecutablePath()
if err != nil {
return err
}
logging.Debugf("symlinking %s to %s", runtimePath, constants.CrcSymlinkPath)
return os.Symlink(runtimePath, constants.CrcSymlinkPath)
}
func removeCrcSymlink() error {
if crcos.FileExists(constants.CrcSymlinkPath) {
return os.Remove(constants.CrcSymlinkPath)
}
return nil
}
|
