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mafredrimafredri
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feat: Check decompressed coder-slim binaries via SHA1 (#2556)
1 parent a0c8e70 commit 69b7eed

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3 files changed

+261
-42
lines changed

3 files changed

+261
-42
lines changed

‎scripts/build_go_slim.sh‎

Lines changed: 18 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -58,7 +58,7 @@ done
5858
# Check dependencies
5959
dependencies go
6060
if [[ $compress != 0 ]]; then
61-
dependencies tar zstd
61+
dependencies shasum tar zstd
6262

6363
if [[ $compress != [0-9]* ]] || [[ $compress -gt 22 ]] || [[ $compress -lt 1 ]]; then
6464
error "Invalid value for compress, must in in the range of [1, 22]"
@@ -110,10 +110,24 @@ for f in ./coder-slim_*; do
110110
done
111111

112112
if [[ $compress != 0 ]]; then
113-
log "--- Compressing coder-slim binaries using zstd level $compress ($dest_dir/coder.tar.zst)"
114113
pushd "$dest_dir"
115-
tar cf coder.tar coder-*
114+
sha_file=coder.sha1
115+
sha_dest="$dest_dir/$sha_file"
116+
log "--- Generating SHA1 for coder-slim binaries ($sha_dest)"
117+
shasum -b -a 1 coder-* | tee $sha_file
118+
echo "$sha_dest"
119+
log
120+
log
121+
122+
tar_name=coder.tar.zst
123+
tar_dest="$dest_dir/$tar_name"
124+
log "--- Compressing coder-slim binaries using zstd level $compress ($tar_dest)"
125+
tar cf coder.tar $sha_file coder-*
116126
rm coder-*
117-
zstd --force --ultra --long -"${compress}" --rm --no-progress coder.tar -o coder.tar.zst
127+
zstd --force --ultra --long -"${compress}" --rm --no-progress coder.tar -o $tar_name
128+
echo "$tar_dest"
129+
log
130+
log
131+
118132
popd
119133
fi

‎site/site.go‎

Lines changed: 105 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -4,6 +4,8 @@ import (
44
"archive/tar"
55
"bytes"
66
"context"
7+
"crypto/sha1" //#nosec // Not used for cryptography.
8+
"encoding/hex"
79
"errors"
810
"fmt"
911
"io"
@@ -20,6 +22,7 @@ import (
2022
"github.com/klauspost/compress/zstd"
2123
"github.com/unrolled/secure"
2224
"golang.org/x/exp/slices"
25+
"golang.org/x/sync/errgroup"
2326
"golang.org/x/xerrors"
2427
)
2528

@@ -439,12 +442,18 @@ func ExtractOrReadBinFS(dest string, siteFS fs.FS) (http.FileSystem, error) {
439442
return nil, err
440443
}
441444

442-
n, err := extractBin(dest, archive)
445+
ok, err := verifyBinSha1IsCurrent(dest, siteFS)
443446
if err != nil {
444-
return nil, xerrors.Errorf("extract coder binaries failed: %w", err)
447+
return nil, xerrors.Errorf("verify coder binaries sha1 failed: %w", err)
445448
}
446-
if n == 0 {
447-
return nil, xerrors.New("no files were extracted from coder binaries archive")
449+
if !ok {
450+
n, err := extractBin(dest, archive)
451+
if err != nil {
452+
return nil, xerrors.Errorf("extract coder binaries failed: %w", err)
453+
}
454+
if n == 0 {
455+
return nil, xerrors.New("no files were extracted from coder binaries archive")
456+
}
448457
}
449458

450459
return dir, nil
@@ -461,6 +470,98 @@ func filterFiles(files []fs.DirEntry, names ...string) []fs.DirEntry {
461470
return filtered
462471
}
463472

473+
// errHashMismatch is a sentinel error used in verifyBinSha1IsCurrent.
474+
var errHashMismatch = xerrors.New("hash mismatch")
475+
476+
func verifyBinSha1IsCurrent(dest string, siteFS fs.FS) (ok bool, err error) {
477+
b1, err := fs.ReadFile(siteFS, "bin/coder.sha1")
478+
if err != nil {
479+
return false, xerrors.Errorf("read coder sha1 from embedded fs failed: %w", err)
480+
}
481+
// Parse sha1 file.
482+
shaFiles := make(map[string][]byte)
483+
for _, line := range bytes.Split(bytes.TrimSpace(b1), []byte{'\n'}) {
484+
parts := bytes.Split(line, []byte{' ', '*'})
485+
if len(parts) != 2 {
486+
return false, xerrors.Errorf("malformed sha1 file: %w", err)
487+
}
488+
shaFiles[string(parts[1])] = parts[0]
489+
}
490+
if len(shaFiles) == 0 {
491+
return false, xerrors.Errorf("empty sha1 file: %w", err)
492+
}
493+
494+
b2, err := os.ReadFile(filepath.Join(dest, "coder.sha1"))
495+
if err != nil {
496+
if xerrors.Is(err, fs.ErrNotExist) {
497+
return false, nil
498+
}
499+
return false, xerrors.Errorf("read coder sha1 failed: %w", err)
500+
}
501+
502+
// Check shasum files for equality for early-exit.
503+
if !bytes.Equal(b1, b2) {
504+
return false, nil
505+
}
506+
507+
var eg errgroup.Group
508+
// Speed up startup by verifying files concurrently. Concurrency
509+
// is limited to save resources / early-exit. Early-exit speed
510+
// could be improved by using a context aware io.Reader and
511+
// passing the context from errgroup.WithContext.
512+
eg.SetLimit(3)
513+
514+
// Verify the hash of each on-disk binary.
515+
for file, hash1 := range shaFiles {
516+
file := file
517+
hash1 := hash1
518+
eg.Go(func() error {
519+
hash2, err := sha1HashFile(filepath.Join(dest, file))
520+
if err != nil {
521+
if xerrors.Is(err, fs.ErrNotExist) {
522+
return errHashMismatch
523+
}
524+
return xerrors.Errorf("hash file failed: %w", err)
525+
}
526+
if !bytes.Equal(hash1, hash2) {
527+
return errHashMismatch
528+
}
529+
return nil
530+
})
531+
}
532+
err = eg.Wait()
533+
if err != nil {
534+
if xerrors.Is(err, errHashMismatch) {
535+
return false, nil
536+
}
537+
return false, err
538+
}
539+
540+
return true, nil
541+
}
542+
543+
// sha1HashFile computes a SHA1 hash of the file, returning the hex
544+
// representation.
545+
func sha1HashFile(name string) ([]byte, error) {
546+
//#nosec // Not used for cryptography.
547+
hash := sha1.New()
548+
f, err := os.Open(name)
549+
if err != nil {
550+
return nil, err
551+
}
552+
defer f.Close()
553+
554+
_, err = io.Copy(hash, f)
555+
if err != nil {
556+
return nil, err
557+
}
558+
559+
b := make([]byte, hash.Size())
560+
hash.Sum(b[:0])
561+
562+
return []byte(hex.EncodeToString(b)), nil
563+
}
564+
464565
func extractBin(dest string, r io.Reader) (numExtraced int, err error) {
465566
opts := []zstd.DOption{
466567
// Concurrency doesn't help us when decoding the tar and

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