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Integrate archiver to simplify download
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Right now, archiver doesn't handle security issue
but there is an existing PR to handle it.
Added walker to handle until upstream is fixed.
When it's updated with go modules, walker can be dropped.

fixes #371
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@ferhatelmas
ferhatelmas committed Nov 13, 2019
1 parent b9a0e88 commit f95ba87
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Showing 4 changed files with 141 additions and 324 deletions.
9 changes: 8 additions & 1 deletion go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -3,18 +3,25 @@ module sigs.k8s.io/krew
go 1.12

require (
github.com/dsnet/compress v0.0.1 // indirect
github.com/fatih/color v1.7.0
github.com/frankban/quicktest v1.6.0 // indirect
github.com/gogo/protobuf v1.2.1 // indirect
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
github.com/google/go-cmp v0.3.0
github.com/golang/snappy v0.0.1 // indirect
github.com/google/go-cmp v0.3.1
github.com/inconshreveable/mousetrap v1.0.0 // indirect
github.com/kylelemons/godebug v1.1.0 // indirect
github.com/mattn/go-colorable v0.1.2 // indirect
github.com/mattn/go-isatty v0.0.8
github.com/mholt/archiver v3.1.1+incompatible
github.com/nwaples/rardecode v1.0.0 // indirect
github.com/pierrec/lz4 v2.3.0+incompatible // indirect
github.com/pkg/errors v0.8.0
github.com/sahilm/fuzzy v0.0.5
github.com/spf13/cobra v0.0.3
github.com/spf13/pflag v1.0.3
github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 // indirect
golang.org/x/net v0.0.0-20190628185345-da137c7871d7 // indirect
golang.org/x/sys v0.0.0-20190712062909-fae7ac547cb7 // indirect
gopkg.in/inf.v0 v0.9.1 // indirect
Expand Down
21 changes: 21 additions & 0 deletions go.sum
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Original file line number Diff line number Diff line change
Expand Up @@ -6,11 +6,16 @@ github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96/go.mod h1:Qh8CwZgvJUkLughtfhJv5dyTYa91l1fOUCrgjqmcifM=
github.com/dsnet/compress v0.0.1 h1:PlZu0n3Tuv04TzpfPbrnI0HW/YwodEXDS+oPKahKF0Q=
github.com/dsnet/compress v0.0.1/go.mod h1:Aw8dCMJ7RioblQeTqt88akK31OvO8Dhf5JflhBbQEHo=
github.com/dsnet/golib v0.0.0-20171103203638-1ea166775780/go.mod h1:Lj+Z9rebOhdfkVLjJ8T6VcRQv3SXugXy999NBtR9aFY=
github.com/elazarl/goproxy v0.0.0-20170405201442-c4fc26588b6e/go.mod h1:/Zj4wYkgs4iZTTu3o/KG3Itv/qCCa8VVMlb3i9OVuzc=
github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
github.com/evanphx/json-patch v4.2.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
github.com/frankban/quicktest v1.6.0 h1:Cd62nl66vQsx8Uv1t8M0eICyxIwZG7MxiAOrdnnUSW0=
github.com/frankban/quicktest v1.6.0/go.mod h1:jaStnuzAqU1AJdCO0l53JDCJrVDKcS03DbaAcR7Ks/o=
github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/ghodss/yaml v0.0.0-20150909031657-73d445a93680 h1:ZktWZesgun21uEDrwW7iEV1zPCGQldM2atlJZ3TdvVM=
github.com/ghodss/yaml v0.0.0-20150909031657-73d445a93680/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
Expand All @@ -27,8 +32,12 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfU
github.com/golang/groupcache v0.0.0-20160516000752-02826c3e7903/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/golang/protobuf v0.0.0-20161109072736-4bd1920723d7/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
github.com/google/gofuzz v0.0.0-20161122191042-44d81051d367/go.mod h1:HP5RmnzzSNb993RKQDq4+1A4ia9nllfqcQFTQJedwGI=
github.com/google/gofuzz v1.0.0 h1:A8PeW59pxE9IoFRqBp37U+mSNaQoZ46F1f0f863XSXw=
github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
Expand All @@ -44,6 +53,8 @@ github.com/json-iterator/go v1.1.6 h1:MrUvLMLTMxbqFJ9kzlvat/rYZqZnW3u4wkLzWTaFwK
github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
github.com/klauspost/compress v1.4.1/go.mod h1:RyIbtBH6LamlWaDj8nUwkbUhJ87Yi3uG0guNDohfE1A=
github.com/klauspost/cpuid v1.2.0/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
Expand All @@ -56,18 +67,24 @@ github.com/mattn/go-colorable v0.1.2 h1:/bC9yWikZXAL9uJdulbSfyVNIR3n3trXl+v8+1sx
github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
github.com/mattn/go-isatty v0.0.8 h1:HLtExJ+uU2HOZ+wI0Tt5DtUDrx8yhUqDcp7fYERX4CE=
github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
github.com/mholt/archiver v3.1.1+incompatible h1:1dCVxuqs0dJseYEhi5pl7MYPH9zDa1wBi7mF09cbNkU=
github.com/mholt/archiver v3.1.1+incompatible/go.mod h1:Dh2dOXnSdiLxRiPoVfIr/fI1TwETms9B8CTWfeh7ROU=
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
github.com/modern-go/reflect2 v0.0.0-20180320133207-05fbef0ca5da/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
github.com/munnerz/goautoneg v0.0.0-20120707110453-a547fc61f48d/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f/go.mod h1:ZdcZmHo+o7JKHSa8/e818NopupXU1YMK5fe1lsApnBw=
github.com/nwaples/rardecode v1.0.0 h1:r7vGuS5akxOnR4JQSkko62RJ1ReCMXxQRPtxsiFMBOs=
github.com/nwaples/rardecode v1.0.0/go.mod h1:5DzqNKiOdpKKBH87u8VlvAnPZMXcGRhxWkRpHbbfGS0=
github.com/onsi/ginkgo v0.0.0-20170829012221-11459a886d9c/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
github.com/onsi/ginkgo v1.8.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
github.com/onsi/gomega v0.0.0-20170829124025-dcabb60a477c/go.mod h1:C1qb7wdrVGGVU+Z6iS04AVkA3Q65CEZX59MT0QO5uiA=
github.com/onsi/gomega v1.5.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
github.com/pierrec/lz4 v2.3.0+incompatible h1:CZzRn4Ut9GbUkHlQ7jqBXeZQV41ZSKWFc302ZU6lUTk=
github.com/pierrec/lz4 v2.3.0+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v0.0.0-20151028094244-d8ed2627bdf0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
Expand All @@ -84,6 +101,10 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
github.com/stretchr/testify v0.0.0-20151208002404-e3a8ff8ce365/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/ulikunitz/xz v0.5.6 h1:jGHAfXawEGZQ3blwU5wnWKQJvAraT7Ftq9EXjnXYgt8=
github.com/ulikunitz/xz v0.5.6/go.mod h1:2bypXElzHzzJZwzH67Y6wb67pO62Rzfn7BSiF4ABRW8=
github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 h1:nIPpBwaJSVYIxUFsDv3M8ofmx9yWTog9BfvIu0q41lo=
github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8/go.mod h1:HUYIGzjTL3rfEspMxjDjgmT5uz5wzYJKVo23qUhYTos=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/net v0.0.0-20170114055629-f2499483f923/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
Expand Down
201 changes: 52 additions & 149 deletions pkg/download/downloader.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -17,145 +17,35 @@ package download
import (
"archive/tar"
"archive/zip"
"bytes"
"compress/gzip"
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"strings"

"github.com/golang/glog"
"github.com/mholt/archiver"
"github.com/pkg/errors"
)

// download gets a file from the internet in memory and writes it content
// to a Verifier.
func download(url string, verifier Verifier, fetcher Fetcher) (io.ReaderAt, int64, error) {
func download(url string, verifier Verifier, fetcher Fetcher) ([]byte, error) {
glog.V(2).Infof("Fetching %q", url)
body, err := fetcher.Get(url)
if err != nil {
return nil, 0, errors.Wrapf(err, "could not download %q", url)
return nil, errors.Wrapf(err, "could not download %q", url)
}
defer body.Close()

glog.V(3).Infof("Reading download data into memory")
data, err := ioutil.ReadAll(io.TeeReader(body, verifier))
if err != nil {
return nil, 0, errors.Wrap(err, "could not read download content")
return nil, errors.Wrap(err, "could not read download content")
}
glog.V(2).Infof("Read %d bytes of download data into memory", len(data))

return bytes.NewReader(data), int64(len(data)), verifier.Verify()
}

// extractZIP extracts a zip file into the target directory.
func extractZIP(targetDir string, read io.ReaderAt, size int64) error {
glog.V(4).Infof("Extracting download zip to %q", targetDir)
zipReader, err := zip.NewReader(read, size)
if err != nil {
return err
}

for _, f := range zipReader.File {
if err := suspiciousPath(f.Name); err != nil {
return err
}

path := filepath.Join(targetDir, filepath.FromSlash(f.Name))
if f.FileInfo().IsDir() {
if err := os.MkdirAll(path, f.Mode()); err != nil {
return errors.Wrap(err, "can't create directory tree")
}
continue
}

src, err := f.Open()
if err != nil {
return errors.Wrap(err, "could not open inflating zip file")
}

dst, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, f.Mode())
if err != nil {
src.Close()
return errors.Wrap(err, "can't create file in zip destination dir")
}
close := func() {
src.Close()
dst.Close()
}

if _, err := io.Copy(dst, src); err != nil {
close()
return errors.Wrap(err, "can't copy content to zip destination file")
}
close()
}

return nil
}

// extractTARGZ extracts a gzipped tar file into the target directory.
func extractTARGZ(targetDir string, at io.ReaderAt, size int64) error {
glog.V(4).Infof("tar: extracting to %q", targetDir)
in := io.NewSectionReader(at, 0, size)

gzr, err := gzip.NewReader(in)
if err != nil {
return errors.Wrap(err, "failed to create gzip reader")
}
defer gzr.Close()

tr := tar.NewReader(gzr)
for {
hdr, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
return errors.Wrap(err, "tar extraction error")
}
glog.V(4).Infof("tar: processing %q (type=%d, mode=%s)", hdr.Name, hdr.Typeflag, os.FileMode(hdr.Mode))
// see https://golang.org/cl/78355 for handling pax_global_header
if hdr.Name == "pax_global_header" {
glog.V(4).Infof("tar: skipping pax_global_header file")
continue
}

if err := suspiciousPath(hdr.Name); err != nil {
return err
}

path := filepath.Join(targetDir, filepath.FromSlash(hdr.Name))
switch hdr.Typeflag {
case tar.TypeDir:
if err := os.MkdirAll(path, os.FileMode(hdr.Mode)); err != nil {
return errors.Wrap(err, "failed to create directory from tar")
}
case tar.TypeReg:
dir := filepath.Dir(path)
glog.V(4).Infof("tar: ensuring parent dirs exist for regular file, dir=%s", dir)
if err := os.MkdirAll(dir, 0755); err != nil {
return errors.Wrap(err, "failed to create directory for tar")
}
f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, os.FileMode(hdr.Mode))
if err != nil {
return errors.Wrapf(err, "failed to create file %q", path)
}
close := func() { f.Close() }
if _, err := io.Copy(f, tr); err != nil {
close()
return errors.Wrapf(err, "failed to copy %q from tar into file", hdr.Name)
}
close()
default:
return errors.Errorf("unable to handle file type %d for %q in tar", hdr.Typeflag, hdr.Name)
}
glog.V(4).Infof("tar: processed %q", hdr.Name)
}
glog.V(4).Infof("tar extraction to %s complete", targetDir)
return nil
return data, verifier.Verify()
}

func suspiciousPath(path string) error {
Expand All @@ -170,44 +60,38 @@ func suspiciousPath(path string) error {
return nil
}

func detectMIMEType(at io.ReaderAt) (string, error) {
buf := make([]byte, 512)
n, err := at.ReadAt(buf, 0)
if err != nil && err != io.EOF {
return "", errors.Wrap(err, "failed to read first 512 bytes")
}
if n < 512 {
glog.V(5).Infof("Did only read %d of 512 bytes to determine the file type", n)
}
func isSuspiciousArchive(path string) error {
return archiver.Walk(path, func(f archiver.File) error {
switch h := f.Header.(type) {
case *tar.Header:
return suspiciousPath(h.Name)
case zip.FileHeader:
return suspiciousPath(h.Name)
default:
return errors.Errorf("Unknow header type: %T", h)
}
})
}

func detectMIMEType(data []byte) string {
n := 512
if l := len(data); l < n {
n = l
}
// Cut off mime extra info beginning with ';' i.e:
// "text/plain; charset=utf-8" should result in "text/plain".
return strings.Split(http.DetectContentType(buf[:n]), ";")[0], nil
}

type extractor func(targetDir string, read io.ReaderAt, size int64) error

var defaultExtractors = map[string]extractor{
"application/zip": extractZIP,
"application/x-gzip": extractTARGZ,
return strings.Split(http.DetectContentType(data[:n]), ";")[0]
}

func extractArchive(dst string, at io.ReaderAt, size int64) error {
// TODO(ahmetb) This package is not architected well, this method should not
// be receiving this many args. Primary problem is at GetInsecure and
// GetWithSha256 methods that embed extraction in them, which is orthogonal.

t, err := detectMIMEType(at)
if err != nil {
return errors.Wrap(err, "failed to determine content type")
func extensionFromMIME(mime string) (string, error) {
switch mime {
case "application/zip":
return "zip", nil
case "application/x-gzip":
return "tar.gz", nil
default:
return "", errors.Errorf("unknown mime type to extract: %q", mime)
}
glog.V(4).Infof("detected %q file type", t)
exf, ok := defaultExtractors[t]
if !ok {
return errors.Errorf("mime type %q for downloaded file is not a supported archive format", t)
}
return errors.Wrap(exf(dst, at, size), "failed to extract file")

}

// Downloader is responsible for fetching, verifying and extracting a binary.
Expand All @@ -227,9 +111,28 @@ func NewDownloader(v Verifier, f Fetcher) Downloader {
// Get pulls the uri and verifies it. On success, the download gets extracted
// into dst.
func (d Downloader) Get(uri, dst string) error {
body, size, err := download(uri, d.verifier, d.fetcher)
data, err := download(uri, d.verifier, d.fetcher)
if err != nil {
return err
}
extension, err := extensionFromMIME(detectMIMEType(data))
if err != nil {
return err
}
return extractArchive(dst, body, size)

f, err := ioutil.TempFile("", "plugin.*."+extension)
if err != nil {
return errors.Wrap(err, "failed to create temp file to write")
}
defer os.Remove(f.Name())
if n, err := f.Write(data); err != nil {
return errors.Wrap(err, "failed to write temp download file")
} else if n != len(data) {
return errors.Errorf("failed to write whole download archive")
}

if err := isSuspiciousArchive(f.Name()); err != nil {
return err
}
return archiver.Unarchive(f.Name(), dst)
}
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