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enforce reserve internal labels.

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The namespaces com.docker.*, io.docker.*, org.dockerproject.*
have been documented to be reserved for Docker's internal use.

Co-Authored-By: Sebastiaan van Stijn <thaJeztah@users.noreply.github.com>
Signed-off-by: Jintao Zhang <zhangjintao9020@gmail.com>
This commit is contained in:
Jintao Zhang 2020-02-12 12:03:35 +08:00
parent c51c65a217
commit 35d6c1870f
5 changed files with 102 additions and 91 deletions
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25
cmd/dockerd/daemon.go
View file

@ -326,19 +326,6 @@ func (cli *DaemonCli) reloadConfig() {
}
cli.authzMiddleware.SetPlugins(c.AuthorizationPlugins)
// The namespaces com.docker.*, io.docker.*, org.dockerproject.* have been documented
// to be reserved for Docker's internal use, but this was never enforced. Allowing
// configured labels to use these namespaces are deprecated for 18.05.
//
// The following will check the usage of such labels, and report a warning for deprecation.
//
// TODO: At the next stable release, the validation should be folded into the other
// configuration validation functions and an error will be returned instead, and this
// block should be deleted.
if err := config.ValidateReservedNamespaceLabels(c.Labels); err != nil {
logrus.Warnf("Configured labels using reserved namespaces is deprecated: %s", err)
}
if err := cli.d.Reload(c); err != nil {
logrus.Errorf("Error reconfiguring the daemon: %v", err)
return
@ -446,18 +433,6 @@ func loadDaemonCliConfig(opts *daemonOptions) (*config.Config, error) {
if err != nil {
return nil, err
}
// The namespaces com.docker.*, io.docker.*, org.dockerproject.* have been documented
// to be reserved for Docker's internal use, but this was never enforced. Allowing
// configured labels to use these namespaces are deprecated for 18.05.
//
// The following will check the usage of such labels, and report a warning for deprecation.
//
// TODO: At the next stable release, the validation should be folded into the other
// configuration validation functions and an error will be returned instead, and this
// block should be deleted.
if err := config.ValidateReservedNamespaceLabels(newLabels); err != nil {
logrus.Warnf("Configured labels using reserved namespaces is deprecated: %s", err)
}
conf.Labels = newLabels
// Regardless of whether the user sets it to true or false, if they

19
daemon/config/config.go
View file

@ -308,25 +308,6 @@ func GetConflictFreeLabels(labels []string) ([]string, error) {
return newLabels, nil
}
// ValidateReservedNamespaceLabels errors if the reserved namespaces com.docker.*,
// io.docker.*, org.dockerproject.* are used in a configured engine label.
//
// TODO: This is a separate function because we need to warn users first of the
// deprecation. When we return an error, this logic can be added to Validate
// or GetConflictFreeLabels instead of being here.
func ValidateReservedNamespaceLabels(labels []string) error {
for _, label := range labels {
lowered := strings.ToLower(label)
if strings.HasPrefix(lowered, "com.docker.") || strings.HasPrefix(lowered, "io.docker.") ||
strings.HasPrefix(lowered, "org.dockerproject.") {
return fmt.Errorf(
"label %s not allowed: the namespaces com.docker.*, io.docker.*, and org.dockerproject.* are reserved for Docker's internal use",
label)
}
}
return nil
}
// Reload reads the configuration in the host and reloads the daemon and server.
func Reload(configFile string, flags *pflag.FlagSet, reload func(*Config)) error {
logrus.Infof("Got signal to reload configuration, reloading from: %s", configFile)

34
daemon/config/config_test.go
View file

@ -188,40 +188,6 @@ func TestFindConfigurationConflictsWithMergedValues(t *testing.T) {
}
}
func TestValidateReservedNamespaceLabels(t *testing.T) {
for _, validLabels := range [][]string{
nil, // no error if there are no labels
{ // no error if there aren't any reserved namespace labels
"hello=world",
"label=me",
},
{ // only reserved namespaces that end with a dot are invalid
"com.dockerpsychnotreserved.label=value",
"io.dockerproject.not=reserved",
"org.docker.not=reserved",
},
} {
assert.Check(t, ValidateReservedNamespaceLabels(validLabels))
}
for _, invalidLabel := range []string{
"com.docker.feature=enabled",
"io.docker.configuration=0",
"org.dockerproject.setting=on",
// casing doesn't matter
"COM.docker.feature=enabled",
"io.DOCKER.CONFIGURATION=0",
"Org.Dockerproject.Setting=on",
} {
err := ValidateReservedNamespaceLabels([]string{
"valid=label",
invalidLabel,
"another=valid",
})
assert.Check(t, is.ErrorContains(err, invalidLabel))
}
}
func TestValidateConfigurationErrors(t *testing.T) {
intPtr := func(i int) *int { return &i }

13
opts/opts.go
View file

@ -254,12 +254,23 @@ func validateDomain(val string) (string, error) {
return "", fmt.Errorf("%s is not a valid domain", val)
}
// ValidateLabel validates that the specified string is a valid label, and returns it.
// ValidateLabel validates that the specified string is a valid label,
// it does not use the reserved namespaces com.docker.*, io.docker.*, org.dockerproject.*
// and returns it.
// Labels are in the form on key=value.
func ValidateLabel(val string) (string, error) {
if strings.Count(val, "=") < 1 {
return "", fmt.Errorf("bad attribute format: %s", val)
}
lowered := strings.ToLower(val)
if strings.HasPrefix(lowered, "com.docker.") || strings.HasPrefix(lowered, "io.docker.") ||
strings.HasPrefix(lowered, "org.dockerproject.") {
return "", fmt.Errorf(
"label %s is not allowed: the namespaces com.docker.*, io.docker.*, and org.dockerproject.* are reserved for internal use",
val)
}
return val, nil
}

102
opts/opts_test.go
View file

@ -4,6 +4,9 @@ import (
"fmt"
"strings"
"testing"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
)
func TestValidateIPAddress(t *testing.T) {
@ -174,19 +177,94 @@ func TestValidateDNSSearch(t *testing.T) {
}
func TestValidateLabel(t *testing.T) {
if _, err := ValidateLabel("label"); err == nil || err.Error() != "bad attribute format: label" {
t.Fatalf("Expected an error [bad attribute format: label], go %v", err)
testCases := []struct {
name string
label string
expectedResult string
expectedErr string
}{
{
name: "lable with bad attribute format",
label: "label",
expectedErr: "bad attribute format: label",
},
{
name: "label with general format",
label: "key1=value1",
expectedResult: "key1=value1",
},
{
name: "label with more than one =",
label: "key1=value1=value2",
expectedResult: "key1=value1=value2",
},
{
name: "label with one more",
label: "key1=value1=value2=value3",
expectedResult: "key1=value1=value2=value3",
},
{
name: "label with no reserved com.docker.*",
label: "com.dockerpsychnotreserved.label=value",
expectedResult: "com.dockerpsychnotreserved.label=value",
},
{
name: "label with no reserved io.docker.*",
label: "io.dockerproject.not=reserved",
expectedResult: "io.dockerproject.not=reserved",
},
{
name: "label with no reserved org.dockerproject.*",
label: "org.docker.not=reserved",
expectedResult: "org.docker.not=reserved",
},
{
name: "label with reserved com.docker.*",
label: "com.docker.feature=enabled",
expectedErr: "label com.docker.feature=enabled is not allowed: the namespaces com.docker.*, io.docker.*, and org.dockerproject.* are reserved for internal use",
},
{
name: "label with reserved upcase com.docker.* ",
label: "COM.docker.feature=enabled",
expectedErr: "label COM.docker.feature=enabled is not allowed: the namespaces com.docker.*, io.docker.*, and org.dockerproject.* are reserved for internal use",
},
{
name: "label with reserved io.docker.*",
label: "io.docker.configuration=0",
expectedErr: "label io.docker.configuration=0 is not allowed: the namespaces com.docker.*, io.docker.*, and org.dockerproject.* are reserved for internal use",
},
{
name: "label with reserved upcase io.docker.*",
label: "io.DOCKER.CONFIGURATion=0",
expectedErr: "label io.DOCKER.CONFIGURATion=0 is not allowed: the namespaces com.docker.*, io.docker.*, and org.dockerproject.* are reserved for internal use",
},
{
name: "label with reserved org.dockerproject.*",
label: "org.dockerproject.setting=on",
expectedErr: "label org.dockerproject.setting=on is not allowed: the namespaces com.docker.*, io.docker.*, and org.dockerproject.* are reserved for internal use",
},
{
name: "label with reserved upcase org.dockerproject.*",
label: "Org.Dockerproject.Setting=on",
expectedErr: "label Org.Dockerproject.Setting=on is not allowed: the namespaces com.docker.*, io.docker.*, and org.dockerproject.* are reserved for internal use",
},
}
if actual, err := ValidateLabel("key1=value1"); err != nil || actual != "key1=value1" {
t.Fatalf("Expected [key1=value1], got [%v,%v]", actual, err)
}
// Validate it's working with more than one =
if actual, err := ValidateLabel("key1=value1=value2"); err != nil {
t.Fatalf("Expected [key1=value1=value2], got [%v,%v]", actual, err)
}
// Validate it's working with one more
if actual, err := ValidateLabel("key1=value1=value2=value3"); err != nil {
t.Fatalf("Expected [key1=value1=value2=value2], got [%v,%v]", actual, err)
for _, testCase := range testCases {
testCase := testCase
t.Run(testCase.name, func(t *testing.T) {
result, err := ValidateLabel(testCase.label)
if testCase.expectedErr != "" {
assert.Error(t, err, testCase.expectedErr)
} else {
assert.NilError(t, err)
}
if testCase.expectedResult != "" {
assert.Check(t, is.Equal(result, testCase.expectedResult))
}
})
}
}