Preserve extended attributes (xattrs) during rootfs extraction

go.mod

@@ -1,13 +1,21 @@
 module github.com/ForAllSecure/rootfs_builder
 
-go 1.12
+go 1.21
 
 require (
 	github.com/google/go-containerregistry v0.0.0-20190910142231-b02d448a3705
 	github.com/pkg/errors v0.8.1
 	github.com/stretchr/testify v1.4.0
+	go.uber.org/zap v1.10.0
+	golang.org/x/sys v0.13.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	go.uber.org/atomic v1.4.0 // indirect
 	go.uber.org/multierr v1.1.0 // indirect
-	go.uber.org/zap v1.10.0
 	golang.org/x/sync v0.0.0-20190423024810-112230192c58 // indirect
+	gopkg.in/yaml.v2 v2.2.2 // indirect
 )

go.sum

@@ -1,70 +1,14 @@
-github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
-github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
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-github.com/davecgh/go-spew v0.0.0-20151105211317-5215b55f46b2/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-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=
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-github.com/go-openapi/spec v0.0.0-20160808142527-6aced65f8501/go.mod h1:J8+jY1nAiCcj+friV/PDoE1/3eeccG9LYBs0tYvLOWc=
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-github.com/google/go-containerregistry v0.0.0-20190820205713-31e00cede111/go.mod h1:yZAFP63pRshzrEYLXLGPmUt0Ay+2zdjmMN1loCnRLUk=
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 github.com/google/go-containerregistry v0.0.0-20190910142231-b02d448a3705 h1:rsBH4vQ2gLNUKf2+82LNQ45AsYnH12Q5ZnHiZXx9LZw=
 github.com/google/go-containerregistry v0.0.0-20190910142231-b02d448a3705/go.mod h1:yZAFP63pRshzrEYLXLGPmUt0Ay+2zdjmMN1loCnRLUk=
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-github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
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 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/spf13/pflag v0.0.0-20170130214245-9ff6c6923cff/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
-github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-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/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 go.uber.org/atomic v1.4.0 h1:cxzIVoETapQEqDhQu3QfnvXAV4AlzcvUCxkVUFw3+EU=
@@ -73,35 +17,11 @@ go.uber.org/multierr v1.1.0 h1:HoEmRHQPVSqub6w2z2d2EOVs2fjyFRGyofhKuyDq0QI=
 go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
 go.uber.org/zap v1.10.0 h1:ORx85nbTijNz8ljznvCMR1ZBIPKFn3jQrag10X2AsuM=
 go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
-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=
-golang.org/x/net v0.0.0-20190812203447-cdfb69ac37fc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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-sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

rootfs/extract.go

@@ -21,8 +21,30 @@ import (
 	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/v1util"
 	"github.com/pkg/errors"
+	"golang.org/x/sys/unix"
 )
 
+// xattrPrefix is how Go's archive/tar package namespaces extended
+// attributes within a PAX header's records (see tar.Header.Xattrs).
+const xattrPrefix = "SCHILY.xattr."
+
+// applyXattrs restores the extended attributes (e.g. file capabilities,
+// SELinux labels) a tar entry carried in its PAX header. Uses Lsetxattr
+// uniformly -- it doesn't follow symlinks, which is required for
+// TypeSymlink and harmless for TypeReg/TypeDir.
+func applyXattrs(path string, hdr *tar.Header) error {
+	for key, value := range hdr.PAXRecords {
+		if !strings.HasPrefix(key, xattrPrefix) {
+			continue
+		}
+		name := strings.TrimPrefix(key, xattrPrefix)
+		if err := unix.Lsetxattr(path, name, []byte(value), 0); err != nil {
+			return errors.Wrapf(err, "setting xattr %q on %s", name, path)
+		}
+	}
+	return nil
+}
+
 // extract a single file
 func extractFile(dest string, hdr *tar.Header, tr io.Reader, subuid int, subgid int) error {
 	// Construct filepath from tar header
@@ -64,6 +86,9 @@ func extractFile(dest string, hdr *tar.Header, tr io.Reader, subuid int, subgid
 			return err
 		}
 		currFile.Close()
+		if err := applyXattrs(path, hdr); err != nil {
+			return err
+		}
 	case tar.TypeDir:
 		if err := os.MkdirAll(path, mode); err != nil {
 			return err
@@ -75,6 +100,9 @@ func extractFile(dest string, hdr *tar.Header, tr io.Reader, subuid int, subgid
 		if err := os.Chown(path, uid, gid); err != nil {
 			return err
 		}
+		if err := applyXattrs(path, hdr); err != nil {
+			return err
+		}
 
 	// Hard link: Two files point to same data on disc.  Assume OFS/Docker orders tarball such
 	// that hard link comes after regular file that hard link points to.
@@ -114,6 +142,9 @@ func extractFile(dest string, hdr *tar.Header, tr io.Reader, subuid int, subgid
 		if err := os.Lchown(path, uid, gid); err != nil {
 			return err
 		}
+		if err := applyXattrs(path, hdr); err != nil {
+			return err
+		}
 	}
 	return nil
 }

rootfs/pull_test.go

@@ -5,12 +5,11 @@ import (
 	"testing"
 	"time"
 
-	"github.com/ForAllSecure/rootfs_builder/rootfs"
 	"github.com/stretchr/testify/require"
 )
 
 func TestPull(t *testing.T) {
-	pullable, err := rootfs.NewPullableImage("../test/alpine.json")
+	pullable, err := NewPullableImage("../test/alpine.json")
 	require.NoError(t, err)
 	_, err = pullable.Pull()
 	require.NoError(t, err)
@@ -21,7 +20,7 @@ func TestPullTimeout(t *testing.T) {
 		t.Skip("skipping timeout test in short mode")
 	}
 
-	pullable, err := rootfs.NewPullableImage("../test/timeout.json")
+	pullable, err := NewPullableImage("../test/timeout.json")
 	require.NoError(t, err)
 
 	start := time.Now()

rootfs/xattr_repro_test.go

@@ -0,0 +1,68 @@
+package rootfs
+
+import (
+	"archive/tar"
+	"bytes"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"golang.org/x/sys/unix"
+)
+
+// Real reproduction of GitHub issue #8: extended attributes on a tar
+// entry are silently dropped during extraction. Builds a REAL tar stream
+// (Go's own archive/tar writer, not a mock) with a PAX xattr record on a
+// regular file, runs it through the actual handleFiles() extraction
+// path, and checks the resulting file's xattr via the real Lgetxattr
+// syscall -- not asserting on internal state, on the actual filesystem
+// object the tool produced.
+func TestExtractedFileKeepsItsXattr(t *testing.T) {
+	dest := t.TempDir()
+
+	var buf bytes.Buffer
+	tw := tar.NewWriter(&buf)
+	content := []byte("hello world\n")
+	hdr := &tar.Header{
+		Name: "testfile",
+		Mode: 0644,
+		// Uid/Gid left at zero; extractFile adds subuid/subgid to these,
+		// so setting them to the CURRENT process's own ids below lets
+		// the resulting chown succeed without root -- unrelated to the
+		// xattr bug this test targets.
+		Size:   int64(len(content)),
+		Format: tar.FormatPAX,
+		PAXRecords: map[string]string{
+			"SCHILY.xattr.user.rootfs_builder_test": "present",
+		},
+	}
+	if err := tw.WriteHeader(hdr); err != nil {
+		t.Fatalf("writing tar header: %v", err)
+	}
+	if _, err := tw.Write(content); err != nil {
+		t.Fatalf("writing tar content: %v", err)
+	}
+	if err := tw.Close(); err != nil {
+		t.Fatalf("closing tar writer: %v", err)
+	}
+
+	tr := tar.NewReader(&buf)
+	if err := handleFiles(tr, dest, os.Getuid(), os.Getgid()); err != nil {
+		t.Fatalf("handleFiles: %v", err)
+	}
+
+	path := filepath.Join(dest, "testfile")
+	if _, err := os.Stat(path); err != nil {
+		t.Fatalf("expected extracted file to exist: %v", err)
+	}
+
+	value := make([]byte, 64)
+	n, err := unix.Lgetxattr(path, "user.rootfs_builder_test", value)
+	if err != nil {
+		t.Fatalf("BUG CONFIRMED (issue #8): extracted file has no "+
+			"user.rootfs_builder_test xattr -- Lgetxattr failed: %v", err)
+	}
+	if got := string(value[:n]); got != "present" {
+		t.Fatalf("xattr value mismatch: got %q, want %q", got, "present")
+	}
+}