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assets_test.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2020 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package boot_test
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"syscall"
. "gopkg.in/check.v1"
"github.com/snapcore/snapd/asserts"
"github.com/snapcore/snapd/boot"
"github.com/snapcore/snapd/boot/boottest"
"github.com/snapcore/snapd/bootloader"
"github.com/snapcore/snapd/bootloader/bootloadertest"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/gadget"
"github.com/snapcore/snapd/logger"
"github.com/snapcore/snapd/secboot"
"github.com/snapcore/snapd/seed"
"github.com/snapcore/snapd/snap"
"github.com/snapcore/snapd/testutil"
"github.com/snapcore/snapd/timings"
)
type assetsSuite struct {
baseBootenvSuite
}
var _ = Suite(&assetsSuite{})
func (s *assetsSuite) SetUpTest(c *C) {
s.baseBootenvSuite.SetUpTest(c)
c.Assert(os.MkdirAll(boot.InitramfsUbuntuBootDir, 0755), IsNil)
c.Assert(os.MkdirAll(boot.InitramfsUbuntuSeedDir, 0755), IsNil)
restore := boot.MockSecbootResealKeys(func(params *secboot.ResealKeysParams) error { return nil })
s.AddCleanup(restore)
}
func checkContentGlob(c *C, glob string, expected []string) {
l, err := filepath.Glob(glob)
c.Assert(err, IsNil)
c.Check(l, DeepEquals, expected)
}
func (s *assetsSuite) uc20UpdateObserverEncryptedSystemMockedBootloader(c *C) (*boot.TrustedAssetsUpdateObserver, *asserts.Model) {
// checked by TrustedAssetsUpdateObserverForModel and
// resealKeyToModeenv
s.stampSealedKeys(c, dirs.GlobalRootDir)
return s.uc20UpdateObserver(c, c.MkDir())
}
func (s *assetsSuite) uc20UpdateObserver(c *C, gadgetDir string) (*boot.TrustedAssetsUpdateObserver, *asserts.Model) {
uc20Model := boottest.MakeMockUC20Model()
obs, err := boot.TrustedAssetsUpdateObserverForModel(uc20Model, gadgetDir)
c.Assert(obs, NotNil)
c.Assert(err, IsNil)
return obs, uc20Model
}
func (s *assetsSuite) bootloaderWithTrustedAssets(c *C, trustedAssets []string) *bootloadertest.MockTrustedAssetsBootloader {
tab := bootloadertest.Mock("trusted", "").WithTrustedAssets()
bootloader.Force(tab)
tab.TrustedAssetsList = trustedAssets
s.AddCleanup(func() { bootloader.Force(nil) })
return tab
}
func (s *assetsSuite) TestAssetsCacheAddRemove(c *C) {
cacheDir := c.MkDir()
d := c.MkDir()
cache := boot.NewTrustedAssetsCache(cacheDir)
data := []byte("foobar")
// SHA3-384
hash := "0fa8abfbdaf924ad307b74dd2ed183b9a4a398891a2f6bac8fd2db7041b77f068580f9c6c66f699b496c2da1cbcc7ed8"
err := ioutil.WriteFile(filepath.Join(d, "foobar"), data, 0644)
c.Assert(err, IsNil)
// add a new file
ta, err := cache.Add(filepath.Join(d, "foobar"), "grub", "grubx64.efi")
c.Assert(err, IsNil)
c.Check(filepath.Join(cacheDir, "grub", fmt.Sprintf("grubx64.efi-%s", hash)), testutil.FileEquals, string(data))
c.Check(ta, NotNil)
// try the same file again
taAgain, err := cache.Add(filepath.Join(d, "foobar"), "grub", "grubx64.efi")
c.Assert(err, IsNil)
// file already cached
c.Check(filepath.Join(cacheDir, "grub", fmt.Sprintf("grubx64.efi-%s", hash)), testutil.FileEquals, string(data))
// and there's just one entry in the cache
checkContentGlob(c, filepath.Join(cacheDir, "grub", "*"), []string{
filepath.Join(cacheDir, "grub", fmt.Sprintf("grubx64.efi-%s", hash)),
})
// let go-check do the deep equals check
c.Check(taAgain, DeepEquals, ta)
// same data but different asset name
taDifferentAsset, err := cache.Add(filepath.Join(d, "foobar"), "grub", "bootx64.efi")
c.Assert(err, IsNil)
// new entry in cache
c.Check(filepath.Join(cacheDir, "grub", fmt.Sprintf("bootx64.efi-%s", hash)), testutil.FileEquals, string(data))
// 2 files now
checkContentGlob(c, filepath.Join(cacheDir, "grub", "*"), []string{
filepath.Join(cacheDir, "grub", fmt.Sprintf("bootx64.efi-%s", hash)),
filepath.Join(cacheDir, "grub", fmt.Sprintf("grubx64.efi-%s", hash)),
})
c.Check(taDifferentAsset, NotNil)
// same source, data (new hash), existing asset name
newData := []byte("new foobar")
newHash := "5aa87615f6613a37d63c9a29746ef57457286c37148a4ae78493b0face5976c1fea940a19486e6bef65d43aec6b8f5a2"
err = ioutil.WriteFile(filepath.Join(d, "foobar"), newData, 0644)
c.Assert(err, IsNil)
taExistingAssetName, err := cache.Add(filepath.Join(d, "foobar"), "grub", "bootx64.efi")
c.Assert(err, IsNil)
// new entry in cache
c.Check(taExistingAssetName, NotNil)
// we have both new and old asset
c.Check(filepath.Join(cacheDir, "grub", fmt.Sprintf("bootx64.efi-%s", newHash)), testutil.FileEquals, string(newData))
c.Check(filepath.Join(cacheDir, "grub", fmt.Sprintf("bootx64.efi-%s", hash)), testutil.FileEquals, string(data))
// 3 files in total
checkContentGlob(c, filepath.Join(cacheDir, "grub", "*"), []string{
filepath.Join(cacheDir, "grub", fmt.Sprintf("bootx64.efi-%s", hash)),
filepath.Join(cacheDir, "grub", fmt.Sprintf("bootx64.efi-%s", newHash)),
filepath.Join(cacheDir, "grub", fmt.Sprintf("grubx64.efi-%s", hash)),
})
// drop
err = cache.Remove("grub", "bootx64.efi", newHash)
c.Assert(err, IsNil)
// asset bootx64.efi with given hash was dropped
c.Check(filepath.Join(cacheDir, "grub", fmt.Sprintf("bootx64.efi-%s", newHash)), testutil.FileAbsent)
// the other file still exists
c.Check(filepath.Join(cacheDir, "grub", fmt.Sprintf("bootx64.efi-%s", hash)), testutil.FileEquals, string(data))
// remove it too
err = cache.Remove("grub", "bootx64.efi", hash)
c.Assert(err, IsNil)
c.Check(filepath.Join(cacheDir, "grub", fmt.Sprintf("bootx64.efi-%s", hash)), testutil.FileAbsent)
// what is left is the grub assets only
checkContentGlob(c, filepath.Join(cacheDir, "grub", "*"), []string{
filepath.Join(cacheDir, "grub", fmt.Sprintf("grubx64.efi-%s", hash)),
})
}
func (s *assetsSuite) TestAssetsCacheAddErr(c *C) {
cacheDir := c.MkDir()
d := c.MkDir()
cache := boot.NewTrustedAssetsCache(cacheDir)
defer os.Chmod(cacheDir, 0755)
err := os.Chmod(cacheDir, 0000)
c.Assert(err, IsNil)
if os.Geteuid() != 0 {
err = ioutil.WriteFile(filepath.Join(d, "foobar"), []byte("foo"), 0644)
c.Assert(err, IsNil)
// cannot create bootloader subdirectory
ta, err := cache.Add(filepath.Join(d, "foobar"), "grub", "grubx64.efi")
c.Assert(err, ErrorMatches, "cannot create cache directory: mkdir .*/grub: permission denied")
c.Check(ta, IsNil)
}
// fix it now
err = os.Chmod(cacheDir, 0755)
c.Assert(err, IsNil)
_, err = cache.Add(filepath.Join(d, "no-file"), "grub", "grubx64.efi")
c.Assert(err, ErrorMatches, "cannot open asset file: open .*/no-file: no such file or directory")
if os.Geteuid() != 0 {
blDir := filepath.Join(cacheDir, "grub")
defer os.Chmod(blDir, 0755)
err = os.Chmod(blDir, 0000)
c.Assert(err, IsNil)
_, err = cache.Add(filepath.Join(d, "foobar"), "grub", "grubx64.efi")
c.Assert(err, ErrorMatches, `cannot create temporary cache file: open .*/grub/grubx64\.efi\.temp\.[a-zA-Z0-9]+~: permission denied`)
}
}
func (s *assetsSuite) TestAssetsCacheRemoveErr(c *C) {
cacheDir := c.MkDir()
d := c.MkDir()
cache := boot.NewTrustedAssetsCache(cacheDir)
data := []byte("foobar")
dataHash := "0fa8abfbdaf924ad307b74dd2ed183b9a4a398891a2f6bac8fd2db7041b77f068580f9c6c66f699b496c2da1cbcc7ed8"
err := ioutil.WriteFile(filepath.Join(d, "foobar"), data, 0644)
c.Assert(err, IsNil)
// cannot create bootloader subdirectory
_, err = cache.Add(filepath.Join(d, "foobar"), "grub", "grubx64.efi")
c.Assert(err, IsNil)
// sanity
c.Check(filepath.Join(cacheDir, "grub", fmt.Sprintf("grubx64.efi-%s", dataHash)), testutil.FileEquals, string(data))
err = cache.Remove("grub", "no file", "some-hash")
c.Assert(err, IsNil)
// different asset name but known hash
err = cache.Remove("grub", "different-name", dataHash)
c.Assert(err, IsNil)
c.Check(filepath.Join(cacheDir, "grub", fmt.Sprintf("grubx64.efi-%s", dataHash)), testutil.FileEquals, string(data))
}
func (s *assetsSuite) TestInstallObserverNew(c *C) {
d := c.MkDir()
// bootloader in gadget cannot be identified
uc20Model := boottest.MakeMockUC20Model()
for _, encryption := range []bool{true, false} {
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, encryption)
c.Assert(err, ErrorMatches, "cannot find bootloader: cannot determine bootloader")
c.Assert(obs, IsNil)
}
// pretend grub is used
c.Assert(ioutil.WriteFile(filepath.Join(d, "grub.conf"), nil, 0755), IsNil)
for _, encryption := range []bool{true, false} {
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, encryption)
c.Assert(err, IsNil)
c.Assert(obs, NotNil)
}
// but nil for non UC20
nonUC20Model := boottest.MakeMockModel()
nonUC20obs, err := boot.TrustedAssetsInstallObserverForModel(nonUC20Model, d, false)
c.Assert(err, Equals, boot.ErrObserverNotApplicable)
c.Assert(nonUC20obs, IsNil)
// listing trusted assets fails
tab := s.bootloaderWithTrustedAssets(c, []string{
"asset",
})
tab.TrustedAssetsErr = fmt.Errorf("fail")
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, true)
c.Assert(err, ErrorMatches, `cannot list "trusted" bootloader trusted assets: fail`)
c.Assert(obs, IsNil)
// failed when listing run bootloader assets
c.Check(tab.TrustedAssetsCalls, Equals, 1)
// force an error
bootloader.ForceError(fmt.Errorf("fail bootloader"))
obs, err = boot.TrustedAssetsInstallObserverForModel(uc20Model, d, true)
c.Assert(err, ErrorMatches, `cannot find bootloader: fail bootloader`)
c.Assert(obs, IsNil)
}
var (
mockRunBootStruct = &gadget.LaidOutStructure{
VolumeStructure: &gadget.VolumeStructure{
Role: gadget.SystemBoot,
},
}
mockSeedStruct = &gadget.LaidOutStructure{
VolumeStructure: &gadget.VolumeStructure{
Role: gadget.SystemSeed,
},
}
)
func (s *assetsSuite) TestInstallObserverObserveSystemBootRealGrub(c *C) {
d := c.MkDir()
// mock a bootloader that uses trusted assets
err := ioutil.WriteFile(filepath.Join(d, "grub.conf"), nil, 0644)
c.Assert(err, IsNil)
// we get an observer for UC20
uc20Model := boottest.MakeMockUC20Model()
useEncryption := true
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, useEncryption)
c.Assert(err, IsNil)
c.Assert(obs, NotNil)
data := []byte("foobar")
// SHA3-384
dataHash := "0fa8abfbdaf924ad307b74dd2ed183b9a4a398891a2f6bac8fd2db7041b77f068580f9c6c66f699b496c2da1cbcc7ed8"
err = ioutil.WriteFile(filepath.Join(d, "foobar"), data, 0644)
c.Assert(err, IsNil)
otherData := []byte("other foobar")
err = ioutil.WriteFile(filepath.Join(d, "other-foobar"), otherData, 0644)
c.Assert(err, IsNil)
writeChange := &gadget.ContentChange{
// file that contains the data of the installed file
After: filepath.Join(d, "foobar"),
// there is no original file in place
Before: "",
}
// only grubx64.efi gets installed to system-boot
res, err := obs.Observe(gadget.ContentWrite, mockRunBootStruct, boot.InitramfsUbuntuBootDir,
"EFI/boot/grubx64.efi", writeChange)
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// Observe is called when populating content, but one can freely specify
// overlapping content entries, so a same file may be observed more than
// once
res, err = obs.Observe(gadget.ContentWrite, mockRunBootStruct, boot.InitramfsUbuntuBootDir,
"EFI/boot/grubx64.efi", writeChange)
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// try with one more file, which is not a trusted asset of a run mode, so it is ignored
res, err = obs.Observe(gadget.ContentWrite, mockRunBootStruct, boot.InitramfsUbuntuBootDir,
"EFI/boot/bootx64.efi", writeChange)
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// a managed boot asset is to be held
res, err = obs.Observe(gadget.ContentWrite, mockRunBootStruct, boot.InitramfsUbuntuBootDir,
"EFI/ubuntu/grub.cfg", writeChange)
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeIgnore)
// a single file in cache
checkContentGlob(c, filepath.Join(dirs.SnapBootAssetsDir, "grub", "*"), []string{
filepath.Join(dirs.SnapBootAssetsDir, "grub", fmt.Sprintf("grubx64.efi-%s", dataHash)),
})
// and one more, a non system-boot structure, so the file is ignored
systemSeedStruct := &gadget.LaidOutStructure{
VolumeStructure: &gadget.VolumeStructure{
Role: gadget.SystemSeed,
},
}
otherWriteChange := &gadget.ContentChange{
After: filepath.Join(d, "other-foobar"),
}
res, err = obs.Observe(gadget.ContentWrite, systemSeedStruct, boot.InitramfsUbuntuBootDir,
"EFI/boot/grubx64.efi", otherWriteChange)
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// still, only one entry in the cache
checkContentGlob(c, filepath.Join(dirs.SnapBootAssetsDir, "grub", "*"), []string{
filepath.Join(dirs.SnapBootAssetsDir, "grub", fmt.Sprintf("grubx64.efi-%s", dataHash)),
})
// let's see what the observer has tracked
tracked := obs.CurrentTrustedBootAssetsMap()
c.Check(tracked, DeepEquals, boot.BootAssetsMap{
"grubx64.efi": []string{dataHash},
})
}
func (s *assetsSuite) TestInstallObserverObserveSystemBootMocked(c *C) {
d := c.MkDir()
tab := s.bootloaderWithTrustedAssets(c, []string{
"asset",
"nested/other-asset",
})
// we get an observer for UC20
uc20Model := boottest.MakeMockUC20Model()
useEncryption := true
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, useEncryption)
c.Assert(err, IsNil)
c.Assert(obs, NotNil)
// the list of trusted assets was asked for run and recovery bootloaders
c.Check(tab.TrustedAssetsCalls, Equals, 2)
data := []byte("foobar")
// SHA3-384
dataHash := "0fa8abfbdaf924ad307b74dd2ed183b9a4a398891a2f6bac8fd2db7041b77f068580f9c6c66f699b496c2da1cbcc7ed8"
err = ioutil.WriteFile(filepath.Join(d, "foobar"), data, 0644)
c.Assert(err, IsNil)
writeChange := &gadget.ContentChange{
// file that contains the data of the installed file
After: filepath.Join(d, "foobar"),
// there is no original file in place
Before: "",
}
res, err := obs.Observe(gadget.ContentWrite, mockRunBootStruct, boot.InitramfsUbuntuBootDir,
"asset", writeChange)
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// observe same asset again
res, err = obs.Observe(gadget.ContentWrite, mockRunBootStruct, boot.InitramfsUbuntuBootDir,
"asset", writeChange)
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// different one
res, err = obs.Observe(gadget.ContentWrite, mockRunBootStruct, boot.InitramfsUbuntuBootDir,
"nested/other-asset", writeChange)
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// a non trusted asset
res, err = obs.Observe(gadget.ContentWrite, mockRunBootStruct, boot.InitramfsUbuntuBootDir,
"non-trusted", writeChange)
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// a single file in cache
checkContentGlob(c, filepath.Join(dirs.SnapBootAssetsDir, "trusted", "*"), []string{
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("asset-%s", dataHash)),
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("other-asset-%s", dataHash)),
})
// let's see what the observer has tracked
tracked := obs.CurrentTrustedBootAssetsMap()
c.Check(tracked, DeepEquals, boot.BootAssetsMap{
"asset": []string{dataHash},
"other-asset": []string{dataHash},
})
}
func (s *assetsSuite) TestInstallObserverObserveSystemBootMockedNoEncryption(c *C) {
d := c.MkDir()
s.bootloaderWithTrustedAssets(c, []string{"asset"})
uc20Model := boottest.MakeMockUC20Model()
useEncryption := false
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, useEncryption)
c.Assert(err, Equals, boot.ErrObserverNotApplicable)
c.Assert(obs, IsNil)
}
func (s *assetsSuite) TestInstallObserverObserveSystemBootMockedUnencryptedWithManaged(c *C) {
d := c.MkDir()
tab := s.bootloaderWithTrustedAssets(c, []string{"asset"})
tab.ManagedAssetsList = []string{"managed"}
uc20Model := boottest.MakeMockUC20Model()
useEncryption := false
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, useEncryption)
c.Assert(err, IsNil)
c.Assert(obs, NotNil)
c.Assert(ioutil.WriteFile(filepath.Join(d, "foobar"), nil, 0755), IsNil)
writeChange := &gadget.ContentChange{
// file that contains the data of the installed file
After: filepath.Join(d, "foobar"),
// there is no original file in place
Before: "",
}
res, err := obs.Observe(gadget.ContentWrite, mockRunBootStruct, boot.InitramfsUbuntuBootDir,
"managed", writeChange)
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeIgnore)
}
func (s *assetsSuite) TestInstallObserverNonTrustedBootloader(c *C) {
// bootloader is not a trusted assets one, but we use encryption, one
// may try setting encryption key on the observer
d := c.MkDir()
// MockBootloader does not implement trusted assets
bootloader.Force(bootloadertest.Mock("mock", ""))
defer bootloader.Force(nil)
// we get an observer for UC20
uc20Model := boottest.MakeMockUC20Model()
useEncryption := true
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, useEncryption)
c.Assert(err, IsNil)
c.Assert(obs, NotNil)
obs.ChosenEncryptionKeys(secboot.EncryptionKey{1, 2, 3, 4}, secboot.EncryptionKey{5, 6, 7, 8})
c.Check(obs.CurrentDataEncryptionKey(), DeepEquals, secboot.EncryptionKey{1, 2, 3, 4})
c.Check(obs.CurrentSaveEncryptionKey(), DeepEquals, secboot.EncryptionKey{5, 6, 7, 8})
}
func (s *assetsSuite) TestInstallObserverTrustedButNoAssets(c *C) {
// bootloader has no trusted assets, but encryption is enabled, and one
// may try setting a key on the observer
d := c.MkDir()
tab := bootloadertest.Mock("trusted-assets", "").WithTrustedAssets()
bootloader.Force(tab)
defer bootloader.Force(nil)
// we get an observer for UC20
uc20Model := boottest.MakeMockUC20Model()
useEncryption := true
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, useEncryption)
c.Assert(err, IsNil)
c.Assert(obs, NotNil)
obs.ChosenEncryptionKeys(secboot.EncryptionKey{1, 2, 3, 4}, secboot.EncryptionKey{5, 6, 7, 8})
c.Check(obs.CurrentDataEncryptionKey(), DeepEquals, secboot.EncryptionKey{1, 2, 3, 4})
c.Check(obs.CurrentSaveEncryptionKey(), DeepEquals, secboot.EncryptionKey{5, 6, 7, 8})
}
func (s *assetsSuite) TestInstallObserverTrustedReuseNameErr(c *C) {
d := c.MkDir()
tab := s.bootloaderWithTrustedAssets(c, []string{
"asset",
"nested/asset",
})
// we get an observer for UC20
uc20Model := boottest.MakeMockUC20Model()
useEncryption := true
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, useEncryption)
c.Assert(err, IsNil)
c.Assert(obs, NotNil)
// the list of trusted assets was asked for run and recovery bootloaders
c.Check(tab.TrustedAssetsCalls, Equals, 2)
err = ioutil.WriteFile(filepath.Join(d, "foobar"), []byte("foobar"), 0644)
c.Assert(err, IsNil)
err = ioutil.WriteFile(filepath.Join(d, "other"), []byte("other"), 0644)
c.Assert(err, IsNil)
res, err := obs.Observe(gadget.ContentWrite, mockRunBootStruct, boot.InitramfsUbuntuBootDir, "asset",
&gadget.ContentChange{After: filepath.Join(d, "foobar")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// same asset name but different content
res, err = obs.Observe(gadget.ContentWrite, mockRunBootStruct, boot.InitramfsUbuntuBootDir, "nested/asset",
&gadget.ContentChange{After: filepath.Join(d, "other")})
c.Assert(err, ErrorMatches, `cannot reuse asset name "asset"`)
c.Check(res, Equals, gadget.ChangeAbort)
}
func (s *assetsSuite) TestInstallObserverObserveExistingRecoveryMocked(c *C) {
d := c.MkDir()
tab := s.bootloaderWithTrustedAssets(c, []string{
"asset",
"nested/other-asset",
"shim",
})
// we get an observer for UC20
uc20Model := boottest.MakeMockUC20Model()
useEncryption := true
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, useEncryption)
c.Assert(err, IsNil)
c.Assert(obs, NotNil)
// trusted assets for the run and recovery bootloaders were asked for
c.Check(tab.TrustedAssetsCalls, Equals, 2)
data := []byte("foobar")
// SHA3-384
dataHash := "0fa8abfbdaf924ad307b74dd2ed183b9a4a398891a2f6bac8fd2db7041b77f068580f9c6c66f699b496c2da1cbcc7ed8"
err = ioutil.WriteFile(filepath.Join(d, "asset"), data, 0644)
c.Assert(err, IsNil)
err = os.Mkdir(filepath.Join(d, "nested"), 0755)
c.Assert(err, IsNil)
err = ioutil.WriteFile(filepath.Join(d, "nested/other-asset"), data, 0644)
c.Assert(err, IsNil)
shim := []byte("shim")
shimHash := "dac0063e831d4b2e7a330426720512fc50fa315042f0bb30f9d1db73e4898dcb89119cac41fdfa62137c8931a50f9d7b"
err = ioutil.WriteFile(filepath.Join(d, "shim"), shim, 0644)
c.Assert(err, IsNil)
err = obs.ObserveExistingTrustedRecoveryAssets(d)
c.Assert(err, IsNil)
checkContentGlob(c, filepath.Join(dirs.SnapBootAssetsDir, "trusted", "*"), []string{
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("asset-%s", dataHash)),
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("other-asset-%s", dataHash)),
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("shim-%s", shimHash)),
})
// the list of trusted assets for recovery was asked for
c.Check(tab.TrustedAssetsCalls, Equals, 2)
// let's see what the observer has tracked
tracked := obs.CurrentTrustedRecoveryBootAssetsMap()
c.Check(tracked, DeepEquals, boot.BootAssetsMap{
"asset": []string{dataHash},
"other-asset": []string{dataHash},
"shim": []string{shimHash},
})
}
func (s *assetsSuite) TestInstallObserverObserveExistingRecoveryReuseNameErr(c *C) {
d := c.MkDir()
tab := s.bootloaderWithTrustedAssets(c, []string{
"asset",
"nested/asset",
})
// we get an observer for UC20
uc20Model := boottest.MakeMockUC20Model()
useEncryption := true
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, useEncryption)
c.Assert(err, IsNil)
c.Assert(obs, NotNil)
// got the list of trusted assets for run and recovery bootloaders
c.Check(tab.TrustedAssetsCalls, Equals, 2)
err = ioutil.WriteFile(filepath.Join(d, "asset"), []byte("foobar"), 0644)
c.Assert(err, IsNil)
err = os.MkdirAll(filepath.Join(d, "nested"), 0755)
c.Assert(err, IsNil)
// same asset name but different content
err = ioutil.WriteFile(filepath.Join(d, "nested/asset"), []byte("other"), 0644)
c.Assert(err, IsNil)
err = obs.ObserveExistingTrustedRecoveryAssets(d)
// same asset name but different content
c.Assert(err, ErrorMatches, `cannot reuse recovery asset name "asset"`)
// got the list of trusted assets for recovery bootloader
c.Check(tab.TrustedAssetsCalls, Equals, 2)
}
func (s *assetsSuite) TestInstallObserverObserveExistingRecoveryButMissingErr(c *C) {
d := c.MkDir()
tab := s.bootloaderWithTrustedAssets(c, []string{
"asset",
})
uc20Model := boottest.MakeMockUC20Model()
useEncryption := true
obs, err := boot.TrustedAssetsInstallObserverForModel(uc20Model, d, useEncryption)
c.Assert(err, IsNil)
c.Assert(obs, NotNil)
c.Check(tab.TrustedAssetsCalls, Equals, 2)
// trusted asset is missing
err = obs.ObserveExistingTrustedRecoveryAssets(d)
c.Assert(err, ErrorMatches, "cannot open asset file: .*/asset: no such file or directory")
}
func (s *assetsSuite) TestUpdateObserverNew(c *C) {
tab := s.bootloaderWithTrustedAssets(c, nil)
uc20Model := boottest.MakeMockUC20Model()
gadgetDir := c.MkDir()
// no trusted or managed assets
obs, err := boot.TrustedAssetsUpdateObserverForModel(uc20Model, gadgetDir)
c.Assert(err, Equals, boot.ErrObserverNotApplicable)
c.Check(obs, IsNil)
// no managed, some trusted assets, but we are not tracking them
tab.TrustedAssetsList = []string{"asset"}
obs, err = boot.TrustedAssetsUpdateObserverForModel(uc20Model, gadgetDir)
c.Assert(err, Equals, boot.ErrObserverNotApplicable)
c.Check(obs, IsNil)
// let's see some managed assets, but not trusted assets
tab.ManagedAssetsList = []string{"managed"}
tab.TrustedAssetsList = nil
obs, err = boot.TrustedAssetsUpdateObserverForModel(uc20Model, gadgetDir)
c.Assert(err, IsNil)
c.Check(obs, NotNil)
// no managed, some trusted which we need to track
s.stampSealedKeys(c, dirs.GlobalRootDir)
tab.ManagedAssetsList = nil
tab.TrustedAssetsList = []string{"asset"}
obs, err = boot.TrustedAssetsUpdateObserverForModel(uc20Model, gadgetDir)
c.Assert(err, IsNil)
c.Assert(obs, NotNil)
// but nil for non UC20
nonUC20Model := boottest.MakeMockModel()
nonUC20obs, err := boot.TrustedAssetsUpdateObserverForModel(nonUC20Model, gadgetDir)
c.Assert(err, Equals, boot.ErrObserverNotApplicable)
c.Assert(nonUC20obs, IsNil)
}
func (s *assetsSuite) TestUpdateObserverUpdateMockedWithReseal(c *C) {
// observe an update where some of the assets exist and some are new,
// followed by reseal
d := c.MkDir()
backups := c.MkDir()
root := c.MkDir()
// try to arrange the backups like the updater would do it
before := []byte("before")
beforeHash := "2df0976fd45ba2392dc7985cdfb7c2d096c1ea4917929dd7a0e9bffae90a443271e702663fc6a4189c1f4ab3ce7daee3"
err := ioutil.WriteFile(filepath.Join(backups, "asset.backup"), before, 0644)
c.Assert(err, IsNil)
data := []byte("foobar")
// SHA3-384
dataHash := "0fa8abfbdaf924ad307b74dd2ed183b9a4a398891a2f6bac8fd2db7041b77f068580f9c6c66f699b496c2da1cbcc7ed8"
err = ioutil.WriteFile(filepath.Join(d, "foobar"), data, 0644)
c.Assert(err, IsNil)
shim := []byte("shim")
shimHash := "dac0063e831d4b2e7a330426720512fc50fa315042f0bb30f9d1db73e4898dcb89119cac41fdfa62137c8931a50f9d7b"
err = ioutil.WriteFile(filepath.Join(d, "shim"), shim, 0644)
c.Assert(err, IsNil)
m := boot.Modeenv{
Mode: "run",
CurrentTrustedBootAssets: boot.BootAssetsMap{
"asset": {beforeHash},
"shim": {"shim-hash"},
},
CurrentTrustedRecoveryBootAssets: boot.BootAssetsMap{
"asset": {beforeHash},
},
}
err = m.WriteTo("")
c.Assert(err, IsNil)
tab := s.bootloaderWithTrustedAssets(c, []string{
"asset",
"nested/other-asset",
"shim",
})
tab.ManagedAssetsList = []string{
"managed-asset",
}
// we get an observer for UC20
obs, _ := s.uc20UpdateObserverEncryptedSystemMockedBootloader(c)
// the list of trusted assets is obtained upfront
c.Check(tab.TrustedAssetsCalls, Equals, 2)
res, err := obs.Observe(gadget.ContentUpdate, mockRunBootStruct, root, "asset",
&gadget.ContentChange{
After: filepath.Join(d, "foobar"),
// original content would get backed up by the updater
Before: filepath.Join(backups, "asset.backup"),
})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
res, err = obs.Observe(gadget.ContentUpdate, mockRunBootStruct, root, "shim",
&gadget.ContentChange{After: filepath.Join(d, "shim")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// observe the recovery struct
res, err = obs.Observe(gadget.ContentUpdate, mockSeedStruct, root, "shim",
&gadget.ContentChange{After: filepath.Join(d, "shim")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
res, err = obs.Observe(gadget.ContentUpdate, mockSeedStruct, root, "asset",
&gadget.ContentChange{
After: filepath.Join(d, "foobar"),
// original content
Before: filepath.Join(backups, "asset.backup"),
})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
res, err = obs.Observe(gadget.ContentUpdate, mockSeedStruct, root, "nested/other-asset",
&gadget.ContentChange{After: filepath.Join(d, "foobar")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// all files are in cache
checkContentGlob(c, filepath.Join(dirs.SnapBootAssetsDir, "trusted", "*"), []string{
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("asset-%s", dataHash)),
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("asset-%s", beforeHash)),
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("other-asset-%s", dataHash)),
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("shim-%s", shimHash)),
})
// check modeenv
newM, err := boot.ReadModeenv("")
c.Assert(err, IsNil)
c.Check(newM.CurrentTrustedBootAssets, DeepEquals, boot.BootAssetsMap{
"asset": {beforeHash, dataHash},
"shim": {"shim-hash", shimHash},
})
c.Check(newM.CurrentTrustedRecoveryBootAssets, DeepEquals, boot.BootAssetsMap{
"asset": {beforeHash, dataHash},
"shim": {shimHash},
"other-asset": {dataHash},
})
// verify that managed assets are to be preserved
res, err = obs.Observe(gadget.ContentUpdate, mockSeedStruct, root, "managed-asset",
&gadget.ContentChange{After: filepath.Join(d, "foobar")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeIgnore)
// everything is set up, trigger a reseal
resealCalls := 0
restore := boot.MockSecbootResealKeys(func(params *secboot.ResealKeysParams) error {
resealCalls++
return nil
})
defer restore()
err = obs.BeforeWrite()
c.Assert(err, IsNil)
c.Check(resealCalls, Equals, 1)
}
func (s *assetsSuite) TestUpdateObserverUpdateExistingAssetMocked(c *C) {
d := c.MkDir()
root := c.MkDir()
tab := s.bootloaderWithTrustedAssets(c, []string{
"asset",
"shim",
})
tab.ManagedAssetsList = []string{
"managed-asset",
"nested/managed-asset",
}
data := []byte("foobar")
// SHA3-384
dataHash := "0fa8abfbdaf924ad307b74dd2ed183b9a4a398891a2f6bac8fd2db7041b77f068580f9c6c66f699b496c2da1cbcc7ed8"
err := ioutil.WriteFile(filepath.Join(d, "foobar"), data, 0644)
c.Assert(err, IsNil)
shim := []byte("shim")
shimHash := "dac0063e831d4b2e7a330426720512fc50fa315042f0bb30f9d1db73e4898dcb89119cac41fdfa62137c8931a50f9d7b"
err = ioutil.WriteFile(filepath.Join(d, "shim"), shim, 0644)
c.Assert(err, IsNil)
// add one file to the cache, as if the system got rebooted before
// modeenv got updated
cache := boot.NewTrustedAssetsCache(dirs.SnapBootAssetsDir)
_, err = cache.Add(filepath.Join(d, "foobar"), "trusted", "asset")
c.Assert(err, IsNil)
// file is in the cache
checkContentGlob(c, filepath.Join(dirs.SnapBootAssetsDir, "trusted", "*"), []string{
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("asset-%s", dataHash)),
})
m := boot.Modeenv{
Mode: "run",
CurrentTrustedBootAssets: boot.BootAssetsMap{
"asset": {"asset-hash"},
},
CurrentTrustedRecoveryBootAssets: boot.BootAssetsMap{
// shim with same hash is listed as trusted, but missing
// from cache
"shim": {shimHash},
},
}
err = m.WriteTo("")
c.Assert(err, IsNil)
// we get an observer for UC20
obs, _ := s.uc20UpdateObserverEncryptedSystemMockedBootloader(c)
// observe the updates
res, err := obs.Observe(gadget.ContentUpdate, mockRunBootStruct, root, "asset",
&gadget.ContentChange{After: filepath.Join(d, "foobar")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
res, err = obs.Observe(gadget.ContentUpdate, mockSeedStruct, root, "asset",
&gadget.ContentChange{After: filepath.Join(d, "foobar")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
res, err = obs.Observe(gadget.ContentUpdate, mockSeedStruct, root, "shim",
&gadget.ContentChange{After: filepath.Join(d, "shim")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// trusted assets were asked for
c.Check(tab.TrustedAssetsCalls, Equals, 2)
// file is in the cache
checkContentGlob(c, filepath.Join(dirs.SnapBootAssetsDir, "trusted", "*"), []string{
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("asset-%s", dataHash)),
// shim was added to cache
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("shim-%s", shimHash)),
})
// check modeenv
newM, err := boot.ReadModeenv("")
c.Assert(err, IsNil)
c.Check(newM.CurrentTrustedBootAssets, DeepEquals, boot.BootAssetsMap{
"asset": {"asset-hash", dataHash},
})
c.Check(newM.CurrentTrustedRecoveryBootAssets, DeepEquals, boot.BootAssetsMap{
"asset": {dataHash},
"shim": {shimHash},
})
// verify that managed assets are to be preserved
res, err = obs.Observe(gadget.ContentUpdate, mockSeedStruct, root, "managed-asset",
&gadget.ContentChange{After: filepath.Join(d, "foobar")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeIgnore)
res, err = obs.Observe(gadget.ContentUpdate, mockSeedStruct, root, "nested/managed-asset",
&gadget.ContentChange{After: filepath.Join(d, "foobar")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeIgnore)
// everything is set up, trigger reseal
resealCalls := 0
restore := boot.MockSecbootResealKeys(func(params *secboot.ResealKeysParams) error {
resealCalls++
return nil
})
defer restore()
// execute before-write action
err = obs.BeforeWrite()
c.Assert(err, IsNil)
c.Check(resealCalls, Equals, 1)
}
func (s *assetsSuite) TestUpdateObserverUpdateNothingTrackedMocked(c *C) {
d := c.MkDir()
root := c.MkDir()
tab := s.bootloaderWithTrustedAssets(c, []string{
"asset",
})
data := []byte("foobar")
// SHA3-384
dataHash := "0fa8abfbdaf924ad307b74dd2ed183b9a4a398891a2f6bac8fd2db7041b77f068580f9c6c66f699b496c2da1cbcc7ed8"
err := ioutil.WriteFile(filepath.Join(d, "foobar"), data, 0644)
c.Assert(err, IsNil)
m := boot.Modeenv{
Mode: "run",
// nothing is tracked in modeenv yet
}
err = m.WriteTo("")
c.Assert(err, IsNil)
// we get an observer for UC20
obs, _ := s.uc20UpdateObserverEncryptedSystemMockedBootloader(c)
// observe the updates
res, err := obs.Observe(gadget.ContentUpdate, mockRunBootStruct, root, "asset",
&gadget.ContentChange{After: filepath.Join(d, "foobar")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
res, err = obs.Observe(gadget.ContentUpdate, mockSeedStruct, root, "asset",
&gadget.ContentChange{After: filepath.Join(d, "foobar")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
// trusted assets were asked for
c.Check(tab.TrustedAssetsCalls, Equals, 2)
// file is in the cache
checkContentGlob(c, filepath.Join(dirs.SnapBootAssetsDir, "trusted", "*"), []string{
filepath.Join(dirs.SnapBootAssetsDir, "trusted", fmt.Sprintf("asset-%s", dataHash)),
})
// check modeenv
newM, err := boot.ReadModeenv("")
c.Assert(err, IsNil)
c.Check(newM.CurrentTrustedBootAssets, DeepEquals, boot.BootAssetsMap{
"asset": {dataHash},
})
c.Check(newM.CurrentTrustedRecoveryBootAssets, DeepEquals, boot.BootAssetsMap{
"asset": {dataHash},
})
// reseal does nothing
err = obs.BeforeWrite()
c.Assert(err, IsNil)
c.Check(tab.RecoveryBootChainCalls, HasLen, 0)
c.Check(tab.BootChainKernelPath, HasLen, 0)
}
func (s *assetsSuite) TestUpdateObserverUpdateOtherRoleStructMocked(c *C) {
d := c.MkDir()
root := c.MkDir()
tab := s.bootloaderWithTrustedAssets(c, []string{
"asset",
})
// modeenv is not set up, but the observer should not care
// we get an observer for UC20
obs, _ := s.uc20UpdateObserverEncryptedSystemMockedBootloader(c)
// and once again for the recovery bootloader
c.Check(tab.TrustedAssetsCalls, Equals, 2)
// non system-boot or system-seed structure gets ignored
mockVolumeStruct := &gadget.LaidOutStructure{
VolumeStructure: &gadget.VolumeStructure{
Role: gadget.SystemData,
},
}
// observe the updates
res, err := obs.Observe(gadget.ContentUpdate, mockVolumeStruct, root, "asset",
&gadget.ContentChange{After: filepath.Join(d, "foobar")})
c.Assert(err, IsNil)
c.Check(res, Equals, gadget.ChangeApply)
}
func (s *assetsSuite) TestUpdateObserverUpdateTrivialErr(c *C) {
// test trivial error scenarios of the update observer
s.stampSealedKeys(c, dirs.GlobalRootDir)
d := c.MkDir()
root := c.MkDir()
gadgetDir := c.MkDir()
uc20Model := boottest.MakeMockUC20Model()
// first no bootloader
bootloader.ForceError(fmt.Errorf("bootloader fail"))
obs, err := boot.TrustedAssetsUpdateObserverForModel(uc20Model, gadgetDir)