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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_gitlab.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 bootstrapGitLabCmd = &cobra.Command{
@@ -73,7 +75,7 @@ var (
glPrivate bool
glHostname string
glSSHHostname string
glPath string
glPath flags.SafeRelativePath
)
func init() {
@@ -84,7 +86,7 @@ func init() {
bootstrapGitLabCmd.Flags().DurationVar(&glInterval, "interval", time.Minute, "sync interval")
bootstrapGitLabCmd.Flags().StringVar(&glHostname, "hostname", git.GitLabDefaultHostname, "GitLab hostname")
bootstrapGitLabCmd.Flags().StringVar(&glSSHHostname, "ssh-hostname", "", "GitLab SSH hostname, to be used when the SSH host differs from the HTTPS one")
bootstrapGitLabCmd.Flags().StringVar(&glPath, "path", "", "repository path, when specified the cluster sync will be scoped to this path")
bootstrapGitLabCmd.Flags().Var(&glPath, "path", "path relative to the repository root, when specified the cluster sync will be scoped to this path")
bootstrapCmd.AddCommand(bootstrapGitLabCmd)
}
@@ -145,13 +147,13 @@ func bootstrapGitLabCmdRun(cmd *cobra.Command, args []string) error {
// generate install manifests
logger.Generatef("generating manifests")
manifest, err := generateInstallManifests(glPath, namespace, tmpDir, bootstrapManifestsPath)
installManifest, err := generateInstallManifests(glPath.String(), namespace, tmpDir, bootstrapManifestsPath)
if err != nil {
return err
}
// stage install manifests
changed, err = repository.Commit(ctx, path.Join(glPath, namespace), "Add manifests")
changed, err = repository.Commit(ctx, path.Join(glPath.String(), namespace), "Add manifests")
if err != nil {
return err
}
@@ -172,7 +174,7 @@ func bootstrapGitLabCmdRun(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")
@@ -225,12 +227,13 @@ func bootstrapGitLabCmdRun(cmd *cobra.Command, args []string) error {
// configure repo synchronization
logger.Actionf("generating sync manifests")
if err := generateSyncManifests(repoURL, bootstrapBranch, namespace, namespace, glPath, tmpDir, glInterval); err != nil {
syncManifests, err := generateSyncManifests(repoURL, bootstrapBranch, namespace, namespace, glPath.String(), tmpDir, glInterval)
if err != nil {
return err
}
// commit and push manifests
if changed, err = repository.Commit(ctx, path.Join(glPath, namespace), "Add manifests"); err != nil {
if changed, err = repository.Commit(ctx, path.Join(glPath.String(), namespace), "Add manifests"); err != nil {
return err
} else if changed {
if err := repository.Push(ctx); err != nil {
@@ -241,7 +244,7 @@ func bootstrapGitLabCmdRun(cmd *cobra.Command, args []string) error {
// apply manifests and waiting for sync
logger.Actionf("applying sync manifests")
if err := applySyncManifests(ctx, kubeClient, namespace, namespace, glPath, tmpDir); err != nil {
if err := applySyncManifests(ctx, kubeClient, namespace, namespace, syncManifests); err != nil {
return err
}