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Merge pull request #2058 from superseb/upstreamdockerselinux

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Dont relabel volumes on upstream Docker & SELinux
This commit is contained in:
Sebastiaan van Steenis 2020-05-29 15:57:39 +02:00 committed by GitHub
commit e9819eb069
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3 changed files with 58 additions and 21 deletions
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16
cluster/plan.go
View File

@ -525,7 +525,6 @@ func (c *Cluster) BuildKubeletProcess(host *hosts.Host, prefixPath string, servi
"/var/lib/calico:/var/lib/calico:z",
"/etc/resolv.conf:/etc/resolv.conf",
"/sys:/sys:rprivate",
host.DockerInfo.DockerRootDir + ":" + host.DockerInfo.DockerRootDir + ":rw,rslave,z",
fmt.Sprintf("%s:%s:shared,z", path.Join(prefixPath, "/var/lib/kubelet"), path.Join(prefixPath, "/var/lib/kubelet")),
"/var/lib/rancher:/var/lib/rancher:shared,z",
"/var/run:/var/run:rw,rprivate",
@ -537,6 +536,12 @@ func (c *Cluster) BuildKubeletProcess(host *hosts.Host, prefixPath string, servi
"/usr:/host/usr:ro",
"/etc:/host/etc:ro",
}
BindDockerRootDir := fmt.Sprintf("%s:%s:rw,rslave,z", host.DockerInfo.DockerRootDir, host.DockerInfo.DockerRootDir)
if hosts.IsEnterpriseLinuxHost(host) && hosts.IsDockerSELinuxEnabled(host) && !hosts.IsEnterpriseLinuxDocker(host) {
// Avoid relabing on Enterprise Linux with Docker SELinux and upstream Docker
BindDockerRootDir = strings.TrimSuffix(BindDockerRootDir, ",z")
}
Binds = append(Binds, BindDockerRootDir)
// Special case to simplify using flex volumes
if path.Join(prefixPath, "/var/lib/kubelet") != "/var/lib/kubelet" {
Binds = append(Binds, "/var/lib/kubelet/volumeplugins:/var/lib/kubelet/volumeplugins:shared,z")
@ -659,8 +664,15 @@ func (c *Cluster) BuildKubeProxyProcess(host *hosts.Host, prefixPath string, ser
Binds := []string{
fmt.Sprintf("%s:/etc/kubernetes:z", path.Join(prefixPath, "/etc/kubernetes")),
"/run:/run",
"/lib/modules:/lib/modules:z,ro",
}
BindModules := "/lib/modules:/lib/modules:z,ro"
if hosts.IsEnterpriseLinuxHost(host) && hosts.IsDockerSELinuxEnabled(host) && !hosts.IsEnterpriseLinuxDocker(host) {
// Avoid relabing on Enterprise Linux with Docker SELinux and upstream Docker
BindModules = "/lib/modules:/lib/modules:ro"
}
Binds = append(Binds, BindModules)
if host.DockerInfo.OSType == "windows" { // compatible with Windows
Binds = []string{
// put the execution binaries to the host

29
hosts/hosts.go
View File

@ -395,3 +395,32 @@ func GetInternalAddressForHosts(hostList []*Host) []string {
}
return hostAddresses
}
func IsDockerSELinuxEnabled(host *Host) bool {
for _, securityOpt := range host.DockerInfo.SecurityOptions {
if securityOpt == "selinux" {
logrus.Debugf("Host [%s] has SELinux enabled in Docker", host.Address)
return true
}
}
return false
}
func IsEnterpriseLinuxHost(host *Host) bool {
operatingSystem := strings.ToLower(host.DockerInfo.OperatingSystem)
if strings.Contains(operatingSystem, "centos") || strings.Contains(operatingSystem, "red hat") {
logrus.Debugf("Host [%s] with OperatingSystem [%s] is Enterprise Linux", host.Address, operatingSystem)
return true
}
return false
}
func IsEnterpriseLinuxDocker(host *Host) bool {
dockerInitBinary := host.DockerInfo.InitBinary
// Init binary for Enterprise Linux Docker (not upstream) is /usr/libexec/docker/docker-init-current
// Init binary for upstream Docker is docker-init
if strings.EqualFold(dockerInitBinary, "/usr/libexec/docker/docker-init-current") {
return true
}
return false
}

34
services/services.go
View File

@ -123,25 +123,21 @@ func GetProcessConfig(process v3.Process, host *hosts.Host) (*container.Config,
hostCfg.RestartPolicy = container.RestartPolicy{Name: process.RestartPolicy}
}
// The MCS label only needs to be applied when container is not running privileged, and running privileged negates need for applying the label
if !process.Privileged {
for _, securityOpt := range host.DockerInfo.SecurityOptions {
// If Docker is configured with selinux-enabled:true, we need to specify MCS label to allow files from service-sidekick to be shared between containers
if securityOpt == "selinux" {
logrus.Debugf("Found selinux in DockerInfo.SecurityOptions on host [%s]", host.Address)
// Check for containers having the sidekick container
for _, volumeFrom := range hostCfg.VolumesFrom {
if volumeFrom == SidekickContainerName {
logrus.Debugf("Found [%s] in VolumesFrom on host [%s], applying MCSLabel [%s]", SidekickContainerName, host.Address, MCSLabel)
hostCfg.SecurityOpt = []string{MCSLabel}
}
}
// Check for sidekick container itself
if value, ok := imageCfg.Labels[ContainerNameLabel]; ok {
if value == SidekickContainerName {
logrus.Debugf("Found [%s=%s] in Labels on host [%s], applying MCSLabel [%s]", ContainerNameLabel, SidekickContainerName, host.Address, MCSLabel)
hostCfg.SecurityOpt = []string{MCSLabel}
}
}
// If Docker is configured with selinux-enabled:true, we need to specify MCS label to allow files from service-sidekick to be shared between containers
if !process.Privileged && hosts.IsDockerSELinuxEnabled(host) {
logrus.Debugf("Found selinux in DockerInfo.SecurityOptions on host [%s]", host.Address)
// Check for containers having the sidekick container
for _, volumeFrom := range hostCfg.VolumesFrom {
if volumeFrom == SidekickContainerName {
logrus.Debugf("Found [%s] in VolumesFrom on host [%s], applying MCSLabel [%s]", SidekickContainerName, host.Address, MCSLabel)
hostCfg.SecurityOpt = []string{MCSLabel}
}
}
// Check for sidekick container itself
if value, ok := imageCfg.Labels[ContainerNameLabel]; ok {
if value == SidekickContainerName {
logrus.Debugf("Found [%s=%s] in Labels on host [%s], applying MCSLabel [%s]", ContainerNameLabel, SidekickContainerName, host.Address, MCSLabel)
hostCfg.SecurityOpt = []string{MCSLabel}
}
}
}