mirror of
https://github.com/fluxcd/flux2.git
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5ea4e814f5
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>
78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
/*
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Copyright 2020 The Flux authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package install
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import (
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"context"
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"strings"
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securejoin "github.com/cyphar/filepath-securejoin"
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"github.com/fluxcd/flux2/pkg/manifestgen"
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)
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// Generate returns the install manifests as a multi-doc YAML.
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// The manifests are built from a GitHub release or from a
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// Kustomize overlay if the supplied Options.BaseURL is a local path.
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func Generate(options Options) (*manifestgen.Manifest, error) {
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ctx, cancel := context.WithTimeout(context.Background(), options.Timeout)
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defer cancel()
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tmpDir, err := ioutil.TempDir("", options.Namespace)
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if err != nil {
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return nil, fmt.Errorf("temp dir error: %w", err)
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}
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defer os.RemoveAll(tmpDir)
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output, err := securejoin.SecureJoin(tmpDir, options.ManifestFile)
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if err != nil {
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return nil, err
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}
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if !strings.HasPrefix(options.BaseURL, "http") {
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if err := build(options.BaseURL, output); err != nil {
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return nil, err
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}
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} else {
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if err := fetch(ctx, options.BaseURL, options.Version, tmpDir); err != nil {
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return nil, err
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}
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if err := generate(tmpDir, options); err != nil {
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return nil, err
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}
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if err := build(tmpDir, output); err != nil {
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return nil, err
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}
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}
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content, err := ioutil.ReadFile(output)
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if err != nil {
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return nil, err
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}
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return &manifestgen.Manifest{
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Path: path.Join(options.TargetPath, options.Namespace, options.ManifestFile),
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Content: string(content),
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}, nil
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}
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