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|
// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package verity
import (
"fmt"
"io"
"math/rand"
"strconv"
"testing"
"time"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/errors/linuxerr"
"gvisor.dev/gvisor/pkg/fspath"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/testutil"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/sentry/vfs"
"gvisor.dev/gvisor/pkg/usermem"
)
const (
// rootMerkleFilename is the name of the root Merkle tree file.
rootMerkleFilename = "root.verity"
// maxDataSize is the maximum data size of a test file.
maxDataSize = 100000
)
var hashAlgs = []HashAlgorithm{SHA256, SHA512}
func dentryFromVD(t *testing.T, vd vfs.VirtualDentry) *dentry {
t.Helper()
d, ok := vd.Dentry().Impl().(*dentry)
if !ok {
t.Fatalf("can't assert %T as a *dentry", vd)
}
return d
}
// dentryFromFD returns the dentry corresponding to fd.
func dentryFromFD(t *testing.T, fd *vfs.FileDescription) *dentry {
t.Helper()
f, ok := fd.Impl().(*fileDescription)
if !ok {
t.Fatalf("can't assert %T as a *fileDescription", fd)
}
return f.d
}
// newVerityRoot creates a new verity mount, and returns the root. The
// underlying file system is tmpfs. If the error is not nil, then cleanup
// should be called when the root is no longer needed.
func newVerityRoot(t *testing.T, hashAlg HashAlgorithm) (*vfs.VirtualFilesystem, vfs.VirtualDentry, context.Context, error) {
t.Helper()
k, err := testutil.Boot()
if err != nil {
t.Fatalf("testutil.Boot: %v", err)
}
ctx := k.SupervisorContext()
rand.Seed(time.Now().UnixNano())
vfsObj := &vfs.VirtualFilesystem{}
if err := vfsObj.Init(ctx); err != nil {
return nil, vfs.VirtualDentry{}, nil, fmt.Errorf("VFS init: %v", err)
}
vfsObj.MustRegisterFilesystemType("verity", FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
AllowUserMount: true,
})
vfsObj.MustRegisterFilesystemType("tmpfs", tmpfs.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
AllowUserMount: true,
})
data := "root_name=" + rootMerkleFilename
mntns, err := vfsObj.NewMountNamespace(ctx, auth.CredentialsFromContext(ctx), "", "verity", &vfs.MountOptions{
GetFilesystemOptions: vfs.GetFilesystemOptions{
Data: data,
InternalData: InternalFilesystemOptions{
LowerName: "tmpfs",
Alg: hashAlg,
AllowRuntimeEnable: true,
Action: ErrorOnViolation,
},
},
})
if err != nil {
return nil, vfs.VirtualDentry{}, nil, fmt.Errorf("NewMountNamespace: %v", err)
}
root := mntns.Root()
root.IncRef()
// Use lowerRoot in the task as we modify the lower file system
// directly in many tests.
lowerRoot := root.Dentry().Impl().(*dentry).lowerVD
tc := k.NewThreadGroup(nil, k.RootPIDNamespace(), kernel.NewSignalHandlers(), linux.SIGCHLD, k.GlobalInit().Limits())
task, err := testutil.CreateTask(ctx, "name", tc, mntns, lowerRoot, lowerRoot)
if err != nil {
t.Fatalf("testutil.CreateTask: %v", err)
}
t.Cleanup(func() {
root.DecRef(ctx)
mntns.DecRef(ctx)
})
return vfsObj, root, task.AsyncContext(), nil
}
// openVerityAt opens a verity file.
//
// TODO(chongc): release reference from opening the file when done.
func openVerityAt(ctx context.Context, vfsObj *vfs.VirtualFilesystem, vd vfs.VirtualDentry, path string, flags uint32, mode linux.FileMode) (*vfs.FileDescription, error) {
return vfsObj.OpenAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: vd,
Start: vd,
Path: fspath.Parse(path),
}, &vfs.OpenOptions{
Flags: flags,
Mode: mode,
})
}
// openLowerAt opens the file in the underlying file system.
//
// TODO(chongc): release reference from opening the file when done.
func (d *dentry) openLowerAt(ctx context.Context, vfsObj *vfs.VirtualFilesystem, path string, flags uint32, mode linux.FileMode) (*vfs.FileDescription, error) {
return vfsObj.OpenAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: d.lowerVD,
Start: d.lowerVD,
Path: fspath.Parse(path),
}, &vfs.OpenOptions{
Flags: flags,
Mode: mode,
})
}
// openLowerMerkleAt opens the Merkle file in the underlying file system.
//
// TODO(chongc): release reference from opening the file when done.
func (d *dentry) openLowerMerkleAt(ctx context.Context, vfsObj *vfs.VirtualFilesystem, flags uint32, mode linux.FileMode) (*vfs.FileDescription, error) {
return vfsObj.OpenAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: d.lowerMerkleVD,
Start: d.lowerMerkleVD,
}, &vfs.OpenOptions{
Flags: flags,
Mode: mode,
})
}
// mkdirLowerAt creates a directory in the underlying file system.
func (d *dentry) mkdirLowerAt(ctx context.Context, vfsObj *vfs.VirtualFilesystem, path string, mode linux.FileMode) error {
return vfsObj.MkdirAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: d.lowerVD,
Start: d.lowerVD,
Path: fspath.Parse(path),
}, &vfs.MkdirOptions{
Mode: mode,
})
}
// unlinkLowerAt deletes the file in the underlying file system.
func (d *dentry) unlinkLowerAt(ctx context.Context, vfsObj *vfs.VirtualFilesystem, path string) error {
return vfsObj.UnlinkAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: d.lowerVD,
Start: d.lowerVD,
Path: fspath.Parse(path),
})
}
// unlinkLowerMerkleAt deletes the Merkle file in the underlying file system.
func (d *dentry) unlinkLowerMerkleAt(ctx context.Context, vfsObj *vfs.VirtualFilesystem, path string) error {
return vfsObj.UnlinkAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: d.lowerVD,
Start: d.lowerVD,
Path: fspath.Parse(merklePrefix + path),
})
}
// renameLowerAt renames file name to newName in the underlying file system.
func (d *dentry) renameLowerAt(ctx context.Context, vfsObj *vfs.VirtualFilesystem, name string, newName string) error {
return vfsObj.RenameAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: d.lowerVD,
Start: d.lowerVD,
Path: fspath.Parse(name),
}, &vfs.PathOperation{
Root: d.lowerVD,
Start: d.lowerVD,
Path: fspath.Parse(newName),
}, &vfs.RenameOptions{})
}
// renameLowerMerkleAt renames Merkle file name to newName in the underlying
// file system.
func (d *dentry) renameLowerMerkleAt(ctx context.Context, vfsObj *vfs.VirtualFilesystem, name string, newName string) error {
return vfsObj.RenameAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: d.lowerVD,
Start: d.lowerVD,
Path: fspath.Parse(merklePrefix + name),
}, &vfs.PathOperation{
Root: d.lowerVD,
Start: d.lowerVD,
Path: fspath.Parse(merklePrefix + newName),
}, &vfs.RenameOptions{})
}
// symlinkLowerAt creates a symbolic link at symlink referring to the given target
// in the underlying filesystem.
func (d *dentry) symlinkLowerAt(ctx context.Context, vfsObj *vfs.VirtualFilesystem, target, symlink string) error {
return vfsObj.SymlinkAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: d.lowerVD,
Start: d.lowerVD,
Path: fspath.Parse(symlink),
}, target)
}
// newFileFD creates a new file in the verity mount, and returns the FD. The FD
// points to a file that has random data generated.
func newFileFD(ctx context.Context, t *testing.T, vfsObj *vfs.VirtualFilesystem, root vfs.VirtualDentry, filePath string, mode linux.FileMode) (*vfs.FileDescription, int, error) {
// Create the file in the underlying file system.
lowerFD, err := dentryFromVD(t, root).openLowerAt(ctx, vfsObj, filePath, linux.O_RDWR|linux.O_CREAT|linux.O_EXCL, linux.ModeRegular|mode)
if err != nil {
return nil, 0, err
}
// Generate random data to be written to the file.
dataSize := rand.Intn(maxDataSize) + 1
data := make([]byte, dataSize)
rand.Read(data)
// Write directly to the underlying FD, since verity FD is read-only.
n, err := lowerFD.Write(ctx, usermem.BytesIOSequence(data), vfs.WriteOptions{})
if err != nil {
return nil, 0, err
}
if n != int64(len(data)) {
return nil, 0, fmt.Errorf("lowerFD.Write got write length %d, want %d", n, len(data))
}
lowerFD.DecRef(ctx)
// Now open the verity file descriptor.
fd, err := openVerityAt(ctx, vfsObj, root, filePath, linux.O_RDONLY, mode)
return fd, dataSize, err
}
// newDirFD creates a new directory in the verity mount, and returns the FD.
func newDirFD(ctx context.Context, t *testing.T, vfsObj *vfs.VirtualFilesystem, root vfs.VirtualDentry, dirPath string, mode linux.FileMode) (*vfs.FileDescription, error) {
// Create the directory in the underlying file system.
if err := dentryFromVD(t, root).mkdirLowerAt(ctx, vfsObj, dirPath, linux.ModeRegular|mode); err != nil {
return nil, err
}
if _, err := dentryFromVD(t, root).openLowerAt(ctx, vfsObj, dirPath, linux.O_RDONLY|linux.O_DIRECTORY, linux.ModeRegular|mode); err != nil {
return nil, err
}
return openVerityAt(ctx, vfsObj, root, dirPath, linux.O_RDONLY|linux.O_DIRECTORY, mode)
}
// newEmptyFileFD creates a new empty file in the verity mount, and returns the FD.
func newEmptyFileFD(ctx context.Context, t *testing.T, vfsObj *vfs.VirtualFilesystem, root vfs.VirtualDentry, filePath string, mode linux.FileMode) (*vfs.FileDescription, error) {
// Create the file in the underlying file system.
_, err := dentryFromVD(t, root).openLowerAt(ctx, vfsObj, filePath, linux.O_RDWR|linux.O_CREAT|linux.O_EXCL, linux.ModeRegular|mode)
if err != nil {
return nil, err
}
// Now open the verity file descriptor.
fd, err := openVerityAt(ctx, vfsObj, root, filePath, linux.O_RDONLY, mode)
return fd, err
}
// flipRandomBit randomly flips a bit in the file represented by fd.
func flipRandomBit(ctx context.Context, fd *vfs.FileDescription, size int) error {
randomPos := int64(rand.Intn(size))
byteToModify := make([]byte, 1)
if _, err := fd.PRead(ctx, usermem.BytesIOSequence(byteToModify), randomPos, vfs.ReadOptions{}); err != nil {
return fmt.Errorf("lowerFD.PRead: %v", err)
}
byteToModify[0] ^= 1
if _, err := fd.PWrite(ctx, usermem.BytesIOSequence(byteToModify), randomPos, vfs.WriteOptions{}); err != nil {
return fmt.Errorf("lowerFD.PWrite: %v", err)
}
return nil
}
func enableVerity(ctx context.Context, t *testing.T, fd *vfs.FileDescription) {
t.Helper()
var args arch.SyscallArguments
args[1] = arch.SyscallArgument{Value: linux.FS_IOC_ENABLE_VERITY}
if _, err := fd.Ioctl(ctx, nil /* uio */, args); err != nil {
t.Fatalf("enable verity: %v", err)
}
}
// TestOpen ensures that when a file is created, the corresponding Merkle tree
// file and the root Merkle tree file exist.
func TestOpen(t *testing.T) {
for _, alg := range hashAlgs {
vfsObj, root, ctx, err := newVerityRoot(t, alg)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, _, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Ensure that the corresponding Merkle tree file is created.
if _, err = dentryFromFD(t, fd).openLowerMerkleAt(ctx, vfsObj, linux.O_RDONLY, linux.ModeRegular); err != nil {
t.Errorf("OpenAt Merkle tree file %s: %v", merklePrefix+filename, err)
}
// Ensure the root merkle tree file is created.
if _, err = dentryFromVD(t, root).openLowerMerkleAt(ctx, vfsObj, linux.O_RDONLY, linux.ModeRegular); err != nil {
t.Errorf("OpenAt root Merkle tree file %s: %v", merklePrefix+rootMerkleFilename, err)
}
}
}
// TestPReadUnmodifiedFileSucceeds ensures that pread from an untouched verity
// file succeeds after enabling verity for it.
func TestPReadUnmodifiedFileSucceeds(t *testing.T) {
for _, alg := range hashAlgs {
vfsObj, root, ctx, err := newVerityRoot(t, alg)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, size, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file and confirm a normal read succeeds.
enableVerity(ctx, t, fd)
buf := make([]byte, size)
n, err := fd.PRead(ctx, usermem.BytesIOSequence(buf), 0 /* offset */, vfs.ReadOptions{})
if err != nil && err != io.EOF {
t.Fatalf("fd.PRead: %v", err)
}
if n != int64(size) {
t.Errorf("fd.PRead got read length %d, want %d", n, size)
}
}
}
// TestReadUnmodifiedFileSucceeds ensures that read from an untouched verity
// file succeeds after enabling verity for it.
func TestReadUnmodifiedFileSucceeds(t *testing.T) {
for _, alg := range hashAlgs {
vfsObj, root, ctx, err := newVerityRoot(t, alg)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, size, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file and confirm a normal read succeeds.
enableVerity(ctx, t, fd)
buf := make([]byte, size)
n, err := fd.Read(ctx, usermem.BytesIOSequence(buf), vfs.ReadOptions{})
if err != nil && err != io.EOF {
t.Fatalf("fd.Read: %v", err)
}
if n != int64(size) {
t.Errorf("fd.PRead got read length %d, want %d", n, size)
}
}
}
// TestReadUnmodifiedEmptyFileSucceeds ensures that read from an untouched empty verity
// file succeeds after enabling verity for it.
func TestReadUnmodifiedEmptyFileSucceeds(t *testing.T) {
for _, alg := range hashAlgs {
vfsObj, root, ctx, err := newVerityRoot(t, alg)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-empty-file"
fd, err := newEmptyFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newEmptyFileFD: %v", err)
}
// Enable verity on the file and confirm a normal read succeeds.
enableVerity(ctx, t, fd)
var buf []byte
n, err := fd.Read(ctx, usermem.BytesIOSequence(buf), vfs.ReadOptions{})
if err != nil && err != io.EOF {
t.Fatalf("fd.Read: %v", err)
}
if n != 0 {
t.Errorf("fd.Read got read length %d, expected 0", n)
}
}
}
// TestReopenUnmodifiedFileSucceeds ensures that reopen an untouched verity file
// succeeds after enabling verity for it.
func TestReopenUnmodifiedFileSucceeds(t *testing.T) {
for _, alg := range hashAlgs {
vfsObj, root, ctx, err := newVerityRoot(t, alg)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, _, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file and confirms a normal read succeeds.
enableVerity(ctx, t, fd)
// Ensure reopening the verity enabled file succeeds.
if _, err = openVerityAt(ctx, vfsObj, root, filename, linux.O_RDONLY, linux.ModeRegular); err != nil {
t.Errorf("reopen enabled file failed: %v", err)
}
}
}
// TestOpenNonexistentFile ensures that opening a nonexistent file does not
// trigger verification failure, even if the parent directory is verified.
func TestOpenNonexistentFile(t *testing.T) {
vfsObj, root, ctx, err := newVerityRoot(t, SHA256)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, _, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file and confirms a normal read succeeds.
enableVerity(ctx, t, fd)
// Enable verity on the parent directory.
parentFD, err := openVerityAt(ctx, vfsObj, root, "", linux.O_RDONLY, linux.ModeRegular)
if err != nil {
t.Fatalf("OpenAt: %v", err)
}
enableVerity(ctx, t, parentFD)
// Ensure open an unexpected file in the parent directory fails with
// ENOENT rather than verification failure.
if _, err = openVerityAt(ctx, vfsObj, root, filename+"abc", linux.O_RDONLY, linux.ModeRegular); !linuxerr.Equals(linuxerr.ENOENT, err) {
t.Errorf("OpenAt unexpected error: %v", err)
}
}
// TestPReadModifiedFileFails ensures that read from a modified verity file
// fails.
func TestPReadModifiedFileFails(t *testing.T) {
for _, alg := range hashAlgs {
vfsObj, root, ctx, err := newVerityRoot(t, alg)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, size, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file.
enableVerity(ctx, t, fd)
// Open a new lowerFD that's read/writable.
lowerFD, err := dentryFromFD(t, fd).openLowerAt(ctx, vfsObj, "", linux.O_RDWR, linux.ModeRegular)
if err != nil {
t.Fatalf("OpenAt: %v", err)
}
if err := flipRandomBit(ctx, lowerFD, size); err != nil {
t.Fatalf("flipRandomBit: %v", err)
}
// Confirm that read from the modified file fails.
buf := make([]byte, size)
if _, err := fd.PRead(ctx, usermem.BytesIOSequence(buf), 0 /* offset */, vfs.ReadOptions{}); err == nil {
t.Fatalf("fd.PRead succeeded, expected failure")
}
}
}
// TestReadModifiedFileFails ensures that read from a modified verity file
// fails.
func TestReadModifiedFileFails(t *testing.T) {
for _, alg := range hashAlgs {
vfsObj, root, ctx, err := newVerityRoot(t, alg)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, size, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file.
enableVerity(ctx, t, fd)
// Open a new lowerFD that's read/writable.
lowerFD, err := dentryFromFD(t, fd).openLowerAt(ctx, vfsObj, "", linux.O_RDWR, linux.ModeRegular)
if err != nil {
t.Fatalf("OpenAt: %v", err)
}
if err := flipRandomBit(ctx, lowerFD, size); err != nil {
t.Fatalf("flipRandomBit: %v", err)
}
// Confirm that read from the modified file fails.
buf := make([]byte, size)
if _, err := fd.Read(ctx, usermem.BytesIOSequence(buf), vfs.ReadOptions{}); err == nil {
t.Fatalf("fd.Read succeeded, expected failure")
}
}
}
// TestModifiedMerkleFails ensures that read from a verity file fails if the
// corresponding Merkle tree file is modified.
func TestModifiedMerkleFails(t *testing.T) {
for _, alg := range hashAlgs {
vfsObj, root, ctx, err := newVerityRoot(t, alg)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, size, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file.
enableVerity(ctx, t, fd)
// Open a new lowerMerkleFD that's read/writable.
lowerMerkleFD, err := dentryFromFD(t, fd).openLowerMerkleAt(ctx, vfsObj, linux.O_RDWR, linux.ModeRegular)
if err != nil {
t.Fatalf("OpenAt: %v", err)
}
// Flip a random bit in the Merkle tree file.
stat, err := lowerMerkleFD.Stat(ctx, vfs.StatOptions{})
if err != nil {
t.Errorf("lowerMerkleFD.Stat: %v", err)
}
if err := flipRandomBit(ctx, lowerMerkleFD, int(stat.Size)); err != nil {
t.Fatalf("flipRandomBit: %v", err)
}
// Confirm that read from a file with modified Merkle tree fails.
buf := make([]byte, size)
if _, err := fd.PRead(ctx, usermem.BytesIOSequence(buf), 0 /* offset */, vfs.ReadOptions{}); err == nil {
t.Fatalf("fd.PRead succeeded with modified Merkle file")
}
}
}
// TestModifiedParentMerkleFails ensures that open a verity enabled file in a
// verity enabled directory fails if the hashes related to the target file in
// the parent Merkle tree file is modified.
func TestModifiedParentMerkleFails(t *testing.T) {
for _, alg := range hashAlgs {
vfsObj, root, ctx, err := newVerityRoot(t, alg)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, _, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file.
enableVerity(ctx, t, fd)
// Enable verity on the parent directory.
parentFD, err := openVerityAt(ctx, vfsObj, root, "", linux.O_RDONLY, linux.ModeRegular)
if err != nil {
t.Fatalf("OpenAt: %v", err)
}
enableVerity(ctx, t, parentFD)
// Open a new lowerMerkleFD that's read/writable.
parentLowerMerkleFD, err := dentryFromFD(t, fd).parent.openLowerMerkleAt(ctx, vfsObj, linux.O_RDWR, linux.ModeRegular)
if err != nil {
t.Fatalf("OpenAt: %v", err)
}
// Flip a random bit in the parent Merkle tree file.
// This parent directory contains only one child, so any random
// modification in the parent Merkle tree should cause verification
// failure when opening the child file.
sizeString, err := parentLowerMerkleFD.GetXattr(ctx, &vfs.GetXattrOptions{
Name: childrenOffsetXattr,
Size: sizeOfStringInt32,
})
if err != nil {
t.Fatalf("parentLowerMerkleFD.GetXattr: %v", err)
}
parentMerkleSize, err := strconv.Atoi(sizeString)
if err != nil {
t.Fatalf("Failed convert size to int: %v", err)
}
if err := flipRandomBit(ctx, parentLowerMerkleFD, parentMerkleSize); err != nil {
t.Fatalf("flipRandomBit: %v", err)
}
parentLowerMerkleFD.DecRef(ctx)
// Ensure reopening the verity enabled file fails.
if _, err = openVerityAt(ctx, vfsObj, root, filename, linux.O_RDONLY, linux.ModeRegular); err == nil {
t.Errorf("OpenAt file with modified parent Merkle succeeded")
}
}
}
// TestUnmodifiedStatSucceeds ensures that stat of an untouched verity file
// succeeds after enabling verity for it.
func TestUnmodifiedStatSucceeds(t *testing.T) {
for _, alg := range hashAlgs {
vfsObj, root, ctx, err := newVerityRoot(t, alg)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, _, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file and confirm that stat succeeds.
enableVerity(ctx, t, fd)
if _, err := fd.Stat(ctx, vfs.StatOptions{}); err != nil {
t.Errorf("fd.Stat: %v", err)
}
}
}
// TestModifiedStatFails checks that getting stat for a file with modified stat
// should fail.
func TestModifiedStatFails(t *testing.T) {
for _, alg := range hashAlgs {
vfsObj, root, ctx, err := newVerityRoot(t, alg)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, _, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file.
enableVerity(ctx, t, fd)
lowerFD := fd.Impl().(*fileDescription).lowerFD
// Change the stat of the underlying file, and check that stat fails.
if err := lowerFD.SetStat(ctx, vfs.SetStatOptions{
Stat: linux.Statx{
Mask: uint32(linux.STATX_MODE),
Mode: 0777,
},
}); err != nil {
t.Fatalf("lowerFD.SetStat: %v", err)
}
if _, err := fd.Stat(ctx, vfs.StatOptions{}); err == nil {
t.Errorf("fd.Stat succeeded when it should fail")
}
}
}
// TestOpenDeletedFileFails ensures that opening a deleted verity enabled file
// and/or the corresponding Merkle tree file fails with the verity error.
func TestOpenDeletedFileFails(t *testing.T) {
testCases := []struct {
name string
// The original file is removed if changeFile is true.
changeFile bool
// The Merkle tree file is removed if changeMerkleFile is true.
changeMerkleFile bool
}{
{
name: "FileOnly",
changeFile: true,
changeMerkleFile: false,
},
{
name: "MerkleOnly",
changeFile: false,
changeMerkleFile: true,
},
{
name: "FileAndMerkle",
changeFile: true,
changeMerkleFile: true,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
vfsObj, root, ctx, err := newVerityRoot(t, SHA256)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, _, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file.
enableVerity(ctx, t, fd)
if tc.changeFile {
if err := dentryFromVD(t, root).unlinkLowerAt(ctx, vfsObj, filename); err != nil {
t.Fatalf("UnlinkAt: %v", err)
}
}
if tc.changeMerkleFile {
if err := dentryFromVD(t, root).unlinkLowerMerkleAt(ctx, vfsObj, filename); err != nil {
t.Fatalf("UnlinkAt: %v", err)
}
}
// Ensure reopening the verity enabled file fails.
if _, err = openVerityAt(ctx, vfsObj, root, filename, linux.O_RDONLY, linux.ModeRegular); !linuxerr.Equals(linuxerr.EIO, err) {
t.Errorf("got OpenAt error: %v, expected EIO", err)
}
})
}
}
// TestOpenRenamedFileFails ensures that opening a renamed verity enabled file
// and/or the corresponding Merkle tree file fails with the verity error.
func TestOpenRenamedFileFails(t *testing.T) {
testCases := []struct {
name string
// The original file is renamed if changeFile is true.
changeFile bool
// The Merkle tree file is renamed if changeMerkleFile is true.
changeMerkleFile bool
}{
{
name: "FileOnly",
changeFile: true,
changeMerkleFile: false,
},
{
name: "MerkleOnly",
changeFile: false,
changeMerkleFile: true,
},
{
name: "FileAndMerkle",
changeFile: true,
changeMerkleFile: true,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
vfsObj, root, ctx, err := newVerityRoot(t, SHA256)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
filename := "verity-test-file"
fd, _, err := newFileFD(ctx, t, vfsObj, root, filename, 0644)
if err != nil {
t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file.
enableVerity(ctx, t, fd)
newFilename := "renamed-test-file"
if tc.changeFile {
if err := dentryFromVD(t, root).renameLowerAt(ctx, vfsObj, filename, newFilename); err != nil {
t.Fatalf("RenameAt: %v", err)
}
}
if tc.changeMerkleFile {
if err := dentryFromVD(t, root).renameLowerMerkleAt(ctx, vfsObj, filename, newFilename); err != nil {
t.Fatalf("UnlinkAt: %v", err)
}
}
// Ensure reopening the verity enabled file fails.
if _, err = openVerityAt(ctx, vfsObj, root, filename, linux.O_RDONLY, linux.ModeRegular); !linuxerr.Equals(linuxerr.EIO, err) {
t.Errorf("got OpenAt error: %v, expected EIO", err)
}
})
}
}
// TestUnmodifiedSymlinkFileReadSucceeds ensures that readlink() for an
// unmodified verity enabled symlink succeeds.
func TestUnmodifiedSymlinkFileReadSucceeds(t *testing.T) {
testCases := []struct {
name string
// The symlink target is a directory.
hasDirectoryTarget bool
// The symlink target is a directory and contains a regular file which will be
// used to test walking a symlink.
testWalk bool
}{
{
name: "RegularFileTarget",
hasDirectoryTarget: false,
testWalk: false,
},
{
name: "DirectoryTarget",
hasDirectoryTarget: true,
testWalk: false,
},
{
name: "RegularFileInSymlinkDirectory",
hasDirectoryTarget: true,
testWalk: true,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
if tc.testWalk && !tc.hasDirectoryTarget {
t.Fatalf("Invalid test case: hasDirectoryTarget can't be false when testing symlink walk")
}
vfsObj, root, ctx, err := newVerityRoot(t, SHA256)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
var target string
if tc.hasDirectoryTarget {
target = "verity-test-dir"
if _, err := newDirFD(ctx, t, vfsObj, root, target, 0644); err != nil {
t.Fatalf("newDirFD: %v", err)
}
} else {
target = "verity-test-file"
if _, _, err := newFileFD(ctx, t, vfsObj, root, target, 0644); err != nil {
t.Fatalf("newFileFD: %v", err)
}
}
if tc.testWalk {
fileInTargetDirectory := target + "/" + "verity-test-file"
if _, _, err := newFileFD(ctx, t, vfsObj, root, fileInTargetDirectory, 0644); err != nil {
t.Fatalf("newFileFD: %v", err)
}
}
symlink := "verity-test-symlink"
if err := dentryFromVD(t, root).symlinkLowerAt(ctx, vfsObj, target, symlink); err != nil {
t.Fatalf("SymlinkAt: %v", err)
}
fd, err := openVerityAt(ctx, vfsObj, root, symlink, linux.O_PATH|linux.O_NOFOLLOW, linux.ModeRegular)
if err != nil {
t.Fatalf("openVerityAt symlink: %v", err)
}
enableVerity(ctx, t, fd)
if _, err := vfsObj.ReadlinkAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: root,
Start: root,
Path: fspath.Parse(symlink),
}); err != nil {
t.Fatalf("ReadlinkAt: %v", err)
}
if tc.testWalk {
fileInSymlinkDirectory := symlink + "/verity-test-file"
// Ensure opening the verity enabled file in the symlink directory succeeds.
if _, err := openVerityAt(ctx, vfsObj, root, fileInSymlinkDirectory, linux.O_RDONLY, linux.ModeRegular); err != nil {
t.Errorf("open enabled file failed: %v", err)
}
}
})
}
}
// TestDeletedSymlinkFileReadFails ensures that reading value of a deleted verity enabled
// symlink fails.
func TestDeletedSymlinkFileReadFails(t *testing.T) {
testCases := []struct {
name string
// The original symlink is unlinked if deleteLink is true.
deleteLink bool
// The Merkle tree file is renamed if deleteMerkleFile is true.
deleteMerkleFile bool
// The symlink target is a directory.
hasDirectoryTarget bool
// The symlink target is a directory and contains a regular file which will be
// used to test walking a symlink.
testWalk bool
}{
{
name: "DeleteLinkRegularFile",
deleteLink: true,
deleteMerkleFile: false,
hasDirectoryTarget: false,
testWalk: false,
},
{
name: "DeleteMerkleRegFile",
deleteLink: false,
deleteMerkleFile: true,
hasDirectoryTarget: false,
testWalk: false,
},
{
name: "DeleteLinkAndMerkleRegFile",
deleteLink: true,
deleteMerkleFile: true,
hasDirectoryTarget: false,
testWalk: false,
},
{
name: "DeleteLinkDirectory",
deleteLink: true,
deleteMerkleFile: false,
hasDirectoryTarget: true,
testWalk: false,
},
{
name: "DeleteMerkleDirectory",
deleteLink: false,
deleteMerkleFile: true,
hasDirectoryTarget: true,
testWalk: false,
},
{
name: "DeleteLinkAndMerkleDirectory",
deleteLink: true,
deleteMerkleFile: true,
hasDirectoryTarget: true,
testWalk: false,
},
{
name: "DeleteLinkDirectoryWalk",
deleteLink: true,
deleteMerkleFile: false,
hasDirectoryTarget: true,
testWalk: true,
},
{
name: "DeleteMerkleDirectoryWalk",
deleteLink: false,
deleteMerkleFile: true,
hasDirectoryTarget: true,
testWalk: true,
},
{
name: "DeleteLinkAndMerkleDirectoryWalk",
deleteLink: true,
deleteMerkleFile: true,
hasDirectoryTarget: true,
testWalk: true,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
if tc.testWalk && !tc.hasDirectoryTarget {
t.Fatalf("Invalid test case: hasDirectoryTarget can't be false when testing symlink walk")
}
vfsObj, root, ctx, err := newVerityRoot(t, SHA256)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
var target string
if tc.hasDirectoryTarget {
target = "verity-test-dir"
if _, err := newDirFD(ctx, t, vfsObj, root, target, 0644); err != nil {
t.Fatalf("newDirFD: %v", err)
}
} else {
target = "verity-test-file"
if _, _, err := newFileFD(ctx, t, vfsObj, root, target, 0644); err != nil {
t.Fatalf("newFileFD: %v", err)
}
}
symlink := "verity-test-symlink"
if err := dentryFromVD(t, root).symlinkLowerAt(ctx, vfsObj, target, symlink); err != nil {
t.Fatalf("SymlinkAt: %v", err)
}
fd, err := openVerityAt(ctx, vfsObj, root, symlink, linux.O_PATH|linux.O_NOFOLLOW, linux.ModeRegular)
if err != nil {
t.Fatalf("openVerityAt symlink: %v", err)
}
if tc.testWalk {
fileInTargetDirectory := target + "/" + "verity-test-file"
if _, _, err := newFileFD(ctx, t, vfsObj, root, fileInTargetDirectory, 0644); err != nil {
t.Fatalf("newFileFD: %v", err)
}
}
enableVerity(ctx, t, fd)
if tc.deleteLink {
if err := dentryFromVD(t, root).unlinkLowerAt(ctx, vfsObj, symlink); err != nil {
t.Fatalf("UnlinkAt: %v", err)
}
}
if tc.deleteMerkleFile {
if err := dentryFromVD(t, root).unlinkLowerMerkleAt(ctx, vfsObj, symlink); err != nil {
t.Fatalf("UnlinkAt: %v", err)
}
}
if _, err := vfsObj.ReadlinkAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: root,
Start: root,
Path: fspath.Parse(symlink),
}); !linuxerr.Equals(linuxerr.EIO, err) {
t.Fatalf("ReadlinkAt succeeded with modified symlink: %v", err)
}
if tc.testWalk {
fileInSymlinkDirectory := symlink + "/verity-test-file"
// Ensure opening the verity enabled file in the symlink directory fails.
if _, err := openVerityAt(ctx, vfsObj, root, fileInSymlinkDirectory, linux.O_RDONLY, linux.ModeRegular); !linuxerr.Equals(linuxerr.EIO, err) {
t.Errorf("Open succeeded with modified symlink: %v", err)
}
}
})
}
}
// TestModifiedSymlinkFileReadFails ensures that reading value of a modified verity enabled
// symlink fails.
func TestModifiedSymlinkFileReadFails(t *testing.T) {
testCases := []struct {
name string
// The symlink target is a directory.
hasDirectoryTarget bool
// The symlink target is a directory and contains a regular file which will be
// used to test walking a symlink.
testWalk bool
}{
{
name: "RegularFileTarget",
hasDirectoryTarget: false,
testWalk: false,
},
{
name: "DirectoryTarget",
hasDirectoryTarget: true,
testWalk: false,
},
{
name: "RegularFileInSymlinkDirectory",
hasDirectoryTarget: true,
testWalk: true,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
if tc.testWalk && !tc.hasDirectoryTarget {
t.Fatalf("Invalid test case: hasDirectoryTarget can't be false when testing symlink walk")
}
vfsObj, root, ctx, err := newVerityRoot(t, SHA256)
if err != nil {
t.Fatalf("newVerityRoot: %v", err)
}
var target string
if tc.hasDirectoryTarget {
target = "verity-test-dir"
if _, err := newDirFD(ctx, t, vfsObj, root, target, 0644); err != nil {
t.Fatalf("newDirFD: %v", err)
}
} else {
target = "verity-test-file"
if _, _, err := newFileFD(ctx, t, vfsObj, root, target, 0644); err != nil {
t.Fatalf("newFileFD: %v", err)
}
}
// Create symlink which points to target file.
symlink := "verity-test-symlink"
if err := dentryFromVD(t, root).symlinkLowerAt(ctx, vfsObj, target, symlink); err != nil {
t.Fatalf("SymlinkAt: %v", err)
}
// Open symlink file to get the fd for ioctl in new step.
fd, err := openVerityAt(ctx, vfsObj, root, symlink, linux.O_PATH|linux.O_NOFOLLOW, linux.ModeRegular)
if err != nil {
t.Fatalf("OpenAt symlink: %v", err)
}
if tc.testWalk {
fileInTargetDirectory := target + "/" + "verity-test-file"
if _, _, err := newFileFD(ctx, t, vfsObj, root, fileInTargetDirectory, 0644); err != nil {
t.Fatalf("newFileFD: %v", err)
}
}
enableVerity(ctx, t, fd)
var newTarget string
if tc.hasDirectoryTarget {
newTarget = "verity-test-dir-new"
if _, err := newDirFD(ctx, t, vfsObj, root, newTarget, 0644); err != nil {
t.Fatalf("newDirFD: %v", err)
}
} else {
newTarget = "verity-test-file-new"
if _, _, err := newFileFD(ctx, t, vfsObj, root, newTarget, 0644); err != nil {
t.Fatalf("newFileFD: %v", err)
}
}
// Unlink symlink->target.
if err := dentryFromVD(t, root).unlinkLowerAt(ctx, vfsObj, symlink); err != nil {
t.Fatalf("UnlinkAt: %v", err)
}
// Link symlink->newTarget.
if err := dentryFromVD(t, root).symlinkLowerAt(ctx, vfsObj, newTarget, symlink); err != nil {
t.Fatalf("SymlinkAt: %v", err)
}
// Freshen lower dentry for symlink.
symlinkVD, err := vfsObj.GetDentryAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: root,
Start: root,
Path: fspath.Parse(symlink),
}, &vfs.GetDentryOptions{})
if err != nil {
t.Fatalf("Failed to get symlink dentry: %v", err)
}
symlinkDentry := dentryFromVD(t, symlinkVD)
symlinkLowerVD, err := dentryFromVD(t, root).getLowerAt(ctx, vfsObj, symlink)
if err != nil {
t.Fatalf("Failed to get symlink lower dentry: %v", err)
}
symlinkDentry.lowerVD = symlinkLowerVD
// Verify ReadlinkAt() fails.
if _, err := vfsObj.ReadlinkAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
Root: root,
Start: root,
Path: fspath.Parse(symlink),
}); !linuxerr.Equals(linuxerr.EIO, err) {
t.Fatalf("ReadlinkAt succeeded with modified symlink: %v", err)
}
if tc.testWalk {
fileInSymlinkDirectory := symlink + "/verity-test-file"
// Ensure opening the verity enabled file in the symlink directory fails.
if _, err := openVerityAt(ctx, vfsObj, root, fileInSymlinkDirectory, linux.O_RDONLY, linux.ModeRegular); !linuxerr.Equals(linuxerr.EIO, err) {
t.Errorf("Open succeeded with modified symlink: %v", err)
}
}
})
}
}
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