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Adding winzip artifact support #64

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merged 4 commits into from
Jun 1, 2022
Merged

Adding winzip artifact support #64

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d4c02b5
Adding winzip artifact support
Atul-source May 27, 2022
e756762
zip/slip fix
Atul-source May 28, 2022
458b545
removed unreachable code
Jun 1, 2022
21ff986
resolved build error
Jun 1, 2022
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125 changes: 87 additions & 38 deletions kf/bpf.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ package kf

import (
"archive/tar"
"archive/zip"
"bytes"
"compress/gzip"
"container/ring"
Expand Down Expand Up @@ -556,55 +557,103 @@ func (b *BPF) GetArtifacts(conf *config.Config) error {
return fmt.Errorf("get request returned unexpected status code: %d (%s), %d was expected\n\tResponse Body: %s", resp.StatusCode, http.StatusText(resp.StatusCode), http.StatusOK, buf.Bytes())
}

archive, err := gzip.NewReader(buf)
if err != nil {
return fmt.Errorf("failed to create Gzip reader: %w", err)
}
defer archive.Close()
if strings.HasSuffix(b.Program.Artifact, ".zip") {
c := bytes.NewReader(buf.Bytes())
zipReader, err := zip.NewReader(c, int64(c.Len()))
if err != nil {
return fmt.Errorf("failed to create zip reader: %w", err)
}
tempDir := filepath.Join(conf.BPFDir, b.Program.Name, b.Program.Version)

tarReader := tar.NewReader(archive)
tempDir := filepath.Join(conf.BPFDir, b.Program.Name, b.Program.Version)
for _, file := range zipReader.File {

for {
header, err := tarReader.Next()
zippedFile, err := file.Open()
if err != nil {
return fmt.Errorf("unzip failed: %w", err)
}
defer zippedFile.Close()

extractedFilePath := filepath.Join(
tempDir,
file.Name,
)
if !strings.HasPrefix(extractedFilePath, filepath.Clean(tempDir)+string(os.PathSeparator)) {
return fmt.Errorf("invalid file path: %s", extractedFilePath)
}
if file.FileInfo().IsDir() {
os.MkdirAll(extractedFilePath, file.Mode())
} else {
outputFile, err := os.OpenFile(
extractedFilePath,
os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
file.Mode(),
)
if err != nil {
return fmt.Errorf("unzip failed to create file: %w", err)
}
defer outputFile.Close()

if err == io.EOF {
break
} else if err != nil {
return fmt.Errorf("untar failed: %w", err)
buf := copyBufPool.Get().(*bytes.Buffer)
_, err = io.CopyBuffer(outputFile, zippedFile, buf.Bytes())
if err != nil {
return fmt.Errorf("GetArtifacts failed to copy files: %w", err)
}
copyBufPool.Put(buf)
}
}

if strings.Contains(header.Name, "..") {
return fmt.Errorf("zipped file contians filepath (%s) that includes (..)", header.Name)
newDir := strings.Split(b.Program.Artifact, ".")
b.FilePath = filepath.Join(tempDir, newDir[0])
return nil
} else if strings.HasSuffix(b.Program.Artifact, ".tar.gz") {
archive, err := gzip.NewReader(buf)
if err != nil {
return fmt.Errorf("failed to create Gzip reader: %w", err)
}
defer archive.Close()
tarReader := tar.NewReader(archive)
tempDir := filepath.Join(conf.BPFDir, b.Program.Name, b.Program.Version)

for {
header, err := tarReader.Next()

fPath = filepath.Join(tempDir, header.Name)
info := header.FileInfo()
if info.IsDir() {
if err = os.MkdirAll(fPath, info.Mode()); err != nil {
return fmt.Errorf("untar failed to create directories: %w", err)
if err == io.EOF {
break
} else if err != nil {
return fmt.Errorf("untar failed: %w", err)
}
continue
}

file, err := os.OpenFile(fPath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, info.Mode())
if err != nil {
return fmt.Errorf("untar failed to create file: %w", err)
}
defer file.Close()
if strings.Contains(header.Name, "..") {
return fmt.Errorf("zipped file contians filepath (%s) that includes (..)", header.Name)
}

buf := copyBufPool.Get().(*bytes.Buffer)
_, err = io.CopyBuffer(file, tarReader, buf.Bytes())
if err != nil {
return fmt.Errorf("GetArtifacts failed to copy files: %w", err)
}
copyBufPool.Put(buf)
}
fPath = filepath.Join(tempDir, header.Name)
info := header.FileInfo()
if info.IsDir() {
if err = os.MkdirAll(fPath, info.Mode()); err != nil {
return fmt.Errorf("untar failed to create directories: %w", err)
}
continue
}

newDir := strings.Split(b.Program.Artifact, ".")
b.FilePath = filepath.Join(tempDir, newDir[0])
file, err := os.OpenFile(fPath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, info.Mode())
if err != nil {
return fmt.Errorf("untar failed to create file: %w", err)
}
defer file.Close()

return nil
buf := copyBufPool.Get().(*bytes.Buffer)
_, err = io.CopyBuffer(file, tarReader, buf.Bytes())
if err != nil {
return fmt.Errorf("GetArtifacts failed to copy files: %w", err)
}
copyBufPool.Put(buf)
}
newDir := strings.Split(b.Program.Artifact, ".")
b.FilePath = filepath.Join(tempDir, newDir[0])
return nil
} else {
return fmt.Errorf("unknown artifact format ")
}
}

// create rules file
Expand Down