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Add safe guards for relative paths

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This commit adds multiple safe guards for relative paths, ensuring they
never traverse outside the working directory.

The `SafeRelativePath` flag calculates the safe relative path based on a
relative base dir, which results in a flattened path.

The write methods of `manifestgen` make use of the `SecureJoin` as well,
to ensure writes are never outside of the given directory when used as
a lib outside of the CLI.

Signed-off-by: Hidde Beydals <hello@hidde.co>
This commit is contained in:
Hidde Beydals
2020-12-14 14:21:41 +01:00
parent 008b3b8408
commit 5ea4e814f5
13 changed files with 180 additions and 71 deletions
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21
cmd/flux/bootstrap_github.go
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@ -29,8 +29,10 @@ import (
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"github.com/fluxcd/flux2/internal/utils"
"github.com/fluxcd/pkg/git"
"github.com/fluxcd/flux2/internal/flags"
"github.com/fluxcd/flux2/internal/utils"
)
var bootstrapGitHubCmd = &cobra.Command{
@ -75,7 +77,7 @@ var (
ghPersonal bool
ghPrivate bool
ghHostname string
ghPath string
ghPath flags.SafeRelativePath
ghTeams []string
ghDelete bool
ghSSHHostname string
@ -94,7 +96,7 @@ func init() {
bootstrapGitHubCmd.Flags().DurationVar(&ghInterval, "interval", time.Minute, "sync interval")
bootstrapGitHubCmd.Flags().StringVar(&ghHostname, "hostname", git.GitHubDefaultHostname, "GitHub hostname")
bootstrapGitHubCmd.Flags().StringVar(&ghSSHHostname, "ssh-hostname", "", "GitHub SSH hostname, to be used when the SSH host differs from the HTTPS one")
bootstrapGitHubCmd.Flags().StringVar(&ghPath, "path", "", "repository path, when specified the cluster sync will be scoped to this path")
bootstrapGitHubCmd.Flags().Var(&ghPath, "path", "path relative to the repository root, when specified the cluster sync will be scoped to this path")
bootstrapGitHubCmd.Flags().BoolVar(&ghDelete, "delete", false, "delete repository (used for testing only)")
bootstrapGitHubCmd.Flags().MarkHidden("delete")
@ -174,13 +176,13 @@ func bootstrapGitHubCmdRun(cmd *cobra.Command, args []string) error {
// generate install manifests
logger.Generatef("generating manifests")
manifest, err := generateInstallManifests(ghPath, namespace, tmpDir, bootstrapManifestsPath)
installManifest, err := generateInstallManifests(ghPath.String(), namespace, tmpDir, bootstrapManifestsPath)
if err != nil {
return err
}
// stage install manifests
changed, err = repository.Commit(ctx, path.Join(ghPath, namespace), "Add manifests")
changed, err = repository.Commit(ctx, path.Join(ghPath.String(), namespace), "Add manifests")
if err != nil {
return err
}
@ -206,7 +208,7 @@ func bootstrapGitHubCmdRun(cmd *cobra.Command, args []string) error {
if isInstall {
// apply install manifests
logger.Actionf("installing components in %s namespace", namespace)
if err := applyInstallManifests(ctx, manifest, bootstrapComponents()); err != nil {
if err := applyInstallManifests(ctx, installManifest, bootstrapComponents()); err != nil {
return err
}
logger.Successf("install completed")
@ -259,12 +261,13 @@ func bootstrapGitHubCmdRun(cmd *cobra.Command, args []string) error {
// configure repo synchronization
logger.Actionf("generating sync manifests")
if err := generateSyncManifests(repoURL, bootstrapBranch, namespace, namespace, ghPath, tmpDir, ghInterval); err != nil {
syncManifests, err := generateSyncManifests(repoURL, bootstrapBranch, namespace, namespace, ghPath.String(), tmpDir, ghInterval)
if err != nil {
return err
}
// commit and push manifests
if changed, err = repository.Commit(ctx, path.Join(ghPath, namespace), "Add manifests"); err != nil {
if changed, err = repository.Commit(ctx, path.Join(ghPath.String(), namespace), "Add manifests"); err != nil {
return err
} else if changed {
if err := repository.Push(ctx); err != nil {
@ -275,7 +278,7 @@ func bootstrapGitHubCmdRun(cmd *cobra.Command, args []string) error {
// apply manifests and waiting for sync
logger.Actionf("applying sync manifests")
if err := applySyncManifests(ctx, kubeClient, namespace, namespace, ghPath, tmpDir); err != nil {
if err := applySyncManifests(ctx, kubeClient, namespace, namespace, syncManifests); err != nil {
return err
}