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Merge pull request #8136 from everpeace/fix-additiona-gids-to-read-image-user

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[CRI] fix additionalGids: it should fallback to imageConfig.User when securityContext.RunAsUser,RunAsUsername are empty
This commit is contained in:
Fu Wei 2023-04-09 14:59:07 +08:00 committed by GitHub
commit 5885db62c8
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4 changed files with 176 additions and 6 deletions
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7
pkg/cri/sbserver/container_create_linux.go
View File

@ -73,12 +73,13 @@ func (c *criService) containerSpecOpts(config *runtime.ContainerConfig, imageCon
specOpts = append(specOpts, oci.WithUser(userstr))
}
userstr = "0" // runtime default
if securityContext.GetRunAsUsername() != "" {
userstr = securityContext.GetRunAsUsername()
} else {
// Even if RunAsUser is not set, we still call `GetValue` to get uid 0.
// Because it is still useful to get additional gids for uid 0.
} else if securityContext.GetRunAsUser() != nil {
userstr = strconv.FormatInt(securityContext.GetRunAsUser().GetValue(), 10)
} else if imageConfig.User != "" {
userstr, _, _ = strings.Cut(imageConfig.User, ":")
}
specOpts = append(specOpts, customopts.WithAdditionalGIDs(userstr),
customopts.WithSupplementalGroups(securityContext.GetSupplementalGroups()))

84
pkg/cri/sbserver/container_create_linux_test.go
View File

@ -1326,6 +1326,90 @@ func TestGenerateUserString(t *testing.T) {
}
}
func TestProcessUser(t *testing.T) {
testID := "test-id"
testSandboxID := "sandbox-id"
testContainerName := "container-name"
testPid := uint32(1234)
ociRuntime := config.Runtime{}
c := newTestCRIService()
testContainer := &containers.Container{ID: "64ddfe361f0099f8d59075398feeb3dcb3863b6851df7b946744755066c03e9d"}
ctx := context.Background()
etcPasswd := `
root:x:0:0:root:/root:/bin/sh
alice:x:1000:1000:alice:/home/alice:/bin/sh
` // #nosec G101
etcGroup := `
root:x:0
alice:x:1000:
additional-group-for-alice:x:11111:alice
additional-group-for-root:x:22222:root
`
tempRootDir, err := os.MkdirTemp("", "TestContainerUser-")
require.NoError(t, err)
if tempRootDir != "" {
defer os.RemoveAll(tempRootDir)
}
require.NoError(t,
os.MkdirAll(filepath.Join(tempRootDir, "etc"), 0755),
)
require.NoError(t,
os.WriteFile(filepath.Join(tempRootDir, "etc", "passwd"), []byte(etcPasswd), 0644),
)
require.NoError(t,
os.WriteFile(filepath.Join(tempRootDir, "etc", "group"), []byte(etcGroup), 0644),
)
for desc, test := range map[string]struct {
imageConfigUser string
securityContext *runtime.LinuxContainerSecurityContext
expected runtimespec.User
}{
"Only SecurityContext was set, SecurityContext defines User": {
securityContext: &runtime.LinuxContainerSecurityContext{
RunAsUser: &runtime.Int64Value{Value: 1000},
RunAsGroup: &runtime.Int64Value{Value: 2000},
SupplementalGroups: []int64{3333},
},
expected: runtimespec.User{UID: 1000, GID: 2000, AdditionalGids: []uint32{2000, 3333, 11111}},
},
"Only imageConfig.User was set, imageConfig.User defines User": {
imageConfigUser: "1000",
securityContext: nil,
expected: runtimespec.User{UID: 1000, GID: 1000, AdditionalGids: []uint32{1000, 11111}},
},
"Both SecurityContext and ImageConfig.User was set, SecurityContext defines User": {
imageConfigUser: "0",
securityContext: &runtime.LinuxContainerSecurityContext{
RunAsUser: &runtime.Int64Value{Value: 1000},
RunAsGroup: &runtime.Int64Value{Value: 2000},
SupplementalGroups: []int64{3333},
},
expected: runtimespec.User{UID: 1000, GID: 2000, AdditionalGids: []uint32{2000, 3333, 11111}},
},
"No SecurityContext nor ImageConfig.User were set, runtime default defines User": {
expected: runtimespec.User{UID: 0, GID: 0, AdditionalGids: []uint32{0, 22222}},
},
} {
t.Run(desc, func(t *testing.T) {
containerConfig, sandboxConfig, imageConfig, _ := getCreateContainerTestData()
containerConfig.Linux.SecurityContext = test.securityContext
imageConfig.User = test.imageConfigUser
spec, err := c.buildContainerSpec(currentPlatform, testID, testSandboxID, testPid, "", testContainerName, testImageName, containerConfig, sandboxConfig, imageConfig, nil, ociRuntime)
require.NoError(t, err)
spec.Root.Path = tempRootDir // simulating /etc/{passwd, group}
opts, err := c.containerSpecOpts(containerConfig, imageConfig)
require.NoError(t, err)
oci.ApplyOpts(ctx, nil, testContainer, spec, opts...)
require.Equal(t, test.expected, spec.Process.User)
})
}
}
func TestNonRootUserAndDevices(t *testing.T) {
testPid := uint32(1234)
c := newTestCRIService()

7
pkg/cri/server/container_create_linux.go
View File

@ -366,12 +366,13 @@ func (c *criService) containerSpecOpts(config *runtime.ContainerConfig, imageCon
specOpts = append(specOpts, oci.WithUser(userstr))
}
userstr = "0" // runtime default
if securityContext.GetRunAsUsername() != "" {
userstr = securityContext.GetRunAsUsername()
} else {
// Even if RunAsUser is not set, we still call `GetValue` to get uid 0.
// Because it is still useful to get additional gids for uid 0.
} else if securityContext.GetRunAsUser() != nil {
userstr = strconv.FormatInt(securityContext.GetRunAsUser().GetValue(), 10)
} else if imageConfig.User != "" {
userstr, _, _ = strings.Cut(imageConfig.User, ":")
}
specOpts = append(specOpts, customopts.WithAdditionalGIDs(userstr),
customopts.WithSupplementalGroups(securityContext.GetSupplementalGroups()))

84
pkg/cri/server/container_create_linux_test.go
View File

@ -1506,6 +1506,90 @@ func TestGenerateUserString(t *testing.T) {
}
}
func TestProcessUser(t *testing.T) {
testID := "test-id"
testSandboxID := "sandbox-id"
testContainerName := "container-name"
testPid := uint32(1234)
ociRuntime := config.Runtime{}
c := newTestCRIService()
testContainer := &containers.Container{ID: "64ddfe361f0099f8d59075398feeb3dcb3863b6851df7b946744755066c03e9d"}
ctx := context.Background()
etcPasswd := `
root:x:0:0:root:/root:/bin/sh
alice:x:1000:1000:alice:/home/alice:/bin/sh
` // #nosec G101
etcGroup := `
root:x:0
alice:x:1000:
additional-group-for-alice:x:11111:alice
additional-group-for-root:x:22222:root
`
tempRootDir, err := os.MkdirTemp("", "TestContainerUser-")
require.NoError(t, err)
if tempRootDir != "" {
defer os.RemoveAll(tempRootDir)
}
require.NoError(t,
os.MkdirAll(filepath.Join(tempRootDir, "etc"), 0755),
)
require.NoError(t,
os.WriteFile(filepath.Join(tempRootDir, "etc", "passwd"), []byte(etcPasswd), 0644),
)
require.NoError(t,
os.WriteFile(filepath.Join(tempRootDir, "etc", "group"), []byte(etcGroup), 0644),
)
for desc, test := range map[string]struct {
imageConfigUser string
securityContext *runtime.LinuxContainerSecurityContext
expected runtimespec.User
}{
"Only SecurityContext was set, SecurityContext defines User": {
securityContext: &runtime.LinuxContainerSecurityContext{
RunAsUser: &runtime.Int64Value{Value: 1000},
RunAsGroup: &runtime.Int64Value{Value: 2000},
SupplementalGroups: []int64{3333},
},
expected: runtimespec.User{UID: 1000, GID: 2000, AdditionalGids: []uint32{2000, 3333, 11111}},
},
"Only imageConfig.User was set, imageConfig.User defines User": {
imageConfigUser: "1000",
securityContext: nil,
expected: runtimespec.User{UID: 1000, GID: 1000, AdditionalGids: []uint32{1000, 11111}},
},
"Both SecurityContext and ImageConfig.User was set, SecurityContext defines User": {
imageConfigUser: "0",
securityContext: &runtime.LinuxContainerSecurityContext{
RunAsUser: &runtime.Int64Value{Value: 1000},
RunAsGroup: &runtime.Int64Value{Value: 2000},
SupplementalGroups: []int64{3333},
},
expected: runtimespec.User{UID: 1000, GID: 2000, AdditionalGids: []uint32{2000, 3333, 11111}},
},
"No SecurityContext nor ImageConfig.User were set, runtime default defines User": {
expected: runtimespec.User{UID: 0, GID: 0, AdditionalGids: []uint32{0, 22222}},
},
} {
t.Run(desc, func(t *testing.T) {
containerConfig, sandboxConfig, imageConfig, _ := getCreateContainerTestData()
containerConfig.Linux.SecurityContext = test.securityContext
imageConfig.User = test.imageConfigUser
spec, err := c.containerSpec(testID, testSandboxID, testPid, "", testContainerName, testImageName, containerConfig, sandboxConfig, imageConfig, nil, ociRuntime)
require.NoError(t, err)
spec.Root.Path = tempRootDir // simulating /etc/{passwd, group}
opts, err := c.containerSpecOpts(containerConfig, imageConfig)
require.NoError(t, err)
oci.ApplyOpts(ctx, nil, testContainer, spec, opts...)
require.Equal(t, test.expected, spec.Process.User)
})
}
}
func TestNonRootUserAndDevices(t *testing.T) {
testPid := uint32(1234)
c := newTestCRIService()