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envoy: restrict permissions on embedded envoy binary (#1999)

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This commit is contained in:
Caleb Doxsey 2021-03-19 09:51:14 -06:00 • committed by GitHub
parent 23bc3f979f
commit 1febaa82ff
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 6 additions and 3 deletions
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7
internal/envoy/embed.go
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@ -2,6 +2,7 @@ package envoy
import (
"fmt"
"io/fs"
"os"
"path/filepath"
@ -9,6 +10,8 @@ import (
resources "gopkg.in/cookieo9/resources-go.v2"
)
const embeddedEnvoyPermissions fs.FileMode = 0o700
var embeddedFilesDirectory = filepath.Join(os.TempDir(), "pomerium-embedded-files")
func extractEmbeddedEnvoy() (outPath string, err error) {
@ -40,7 +43,7 @@ func extractEmbeddedEnvoy() (outPath string, err error) {
if zf, ok := rc.(interface{ FileInfo() os.FileInfo }); ok {
zfi = zf.FileInfo()
if fi, e := os.Stat(outPath); e == nil {
if fi.Size() == zfi.Size() && fi.ModTime() == zfi.ModTime() {
if fi.Size() == zfi.Size() && fi.ModTime() == zfi.ModTime() && zfi.Mode().Perm() == embeddedEnvoyPermissions {
return outPath, nil
}
}
@ -51,7 +54,7 @@ func extractEmbeddedEnvoy() (outPath string, err error) {
return "", fmt.Errorf("error extracting embedded envoy binary to temporary directory (path=%s): %w", outPath, err)
}
err = os.Chmod(outPath, 0o755)
err = os.Chmod(outPath, embeddedEnvoyPermissions)
if err != nil {
return "", fmt.Errorf("error chmoding embedded envoy binary: %w", err)
}

2
internal/envoy/envoy.go
View file

@ -73,7 +73,7 @@ type Server struct {
// NewServer creates a new server with traffic routed by envoy.
func NewServer(src config.Source, grpcPort, httpPort string) (*Server, error) {
wd := filepath.Join(os.TempDir(), workingDirectoryName)
err := os.MkdirAll(wd, 0o755)
err := os.MkdirAll(wd, embeddedEnvoyPermissions)
if err != nil {
return nil, fmt.Errorf("error creating temporary working directory for envoy: %w", err)
}