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https://github.com/genuinetools/reg.git
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133 lines
3.6 KiB
Go
133 lines
3.6 KiB
Go
package validate
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/opencontainers/runc/libcontainer/configs"
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)
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type Validator interface {
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Validate(*configs.Config) error
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}
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func New() Validator {
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return &ConfigValidator{}
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}
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type ConfigValidator struct {
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}
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func (v *ConfigValidator) Validate(config *configs.Config) error {
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if err := v.rootfs(config); err != nil {
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return err
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}
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if err := v.network(config); err != nil {
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return err
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}
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if err := v.hostname(config); err != nil {
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return err
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}
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if err := v.security(config); err != nil {
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return err
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}
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if err := v.usernamespace(config); err != nil {
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return err
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}
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if err := v.sysctl(config); err != nil {
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return err
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}
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return nil
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}
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// rootfs validates if the rootfs is an absolute path and is not a symlink
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// to the container's root filesystem.
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func (v *ConfigValidator) rootfs(config *configs.Config) error {
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cleaned, err := filepath.Abs(config.Rootfs)
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if err != nil {
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return err
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}
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if cleaned, err = filepath.EvalSymlinks(cleaned); err != nil {
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return err
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}
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if filepath.Clean(config.Rootfs) != cleaned {
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return fmt.Errorf("%s is not an absolute path or is a symlink", config.Rootfs)
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}
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return nil
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}
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func (v *ConfigValidator) network(config *configs.Config) error {
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if !config.Namespaces.Contains(configs.NEWNET) {
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if len(config.Networks) > 0 || len(config.Routes) > 0 {
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return fmt.Errorf("unable to apply network settings without a private NET namespace")
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}
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}
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return nil
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}
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func (v *ConfigValidator) hostname(config *configs.Config) error {
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if config.Hostname != "" && !config.Namespaces.Contains(configs.NEWUTS) {
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return fmt.Errorf("unable to set hostname without a private UTS namespace")
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}
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return nil
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}
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func (v *ConfigValidator) security(config *configs.Config) error {
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// restrict sys without mount namespace
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if (len(config.MaskPaths) > 0 || len(config.ReadonlyPaths) > 0) &&
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!config.Namespaces.Contains(configs.NEWNS) {
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return fmt.Errorf("unable to restrict sys entries without a private MNT namespace")
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}
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return nil
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}
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func (v *ConfigValidator) usernamespace(config *configs.Config) error {
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if config.Namespaces.Contains(configs.NEWUSER) {
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if _, err := os.Stat("/proc/self/ns/user"); os.IsNotExist(err) {
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return fmt.Errorf("USER namespaces aren't enabled in the kernel")
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}
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} else {
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if config.UidMappings != nil || config.GidMappings != nil {
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return fmt.Errorf("User namespace mappings specified, but USER namespace isn't enabled in the config")
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}
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}
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return nil
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}
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// sysctl validates that the specified sysctl keys are valid or not.
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// /proc/sys isn't completely namespaced and depending on which namespaces
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// are specified, a subset of sysctls are permitted.
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func (v *ConfigValidator) sysctl(config *configs.Config) error {
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validSysctlMap := map[string]bool{
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"kernel.msgmax": true,
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"kernel.msgmnb": true,
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"kernel.msgmni": true,
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"kernel.sem": true,
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"kernel.shmall": true,
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"kernel.shmmax": true,
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"kernel.shmmni": true,
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"kernel.shm_rmid_forced": true,
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}
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for s := range config.Sysctl {
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if validSysctlMap[s] || strings.HasPrefix(s, "fs.mqueue.") {
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if config.Namespaces.Contains(configs.NEWIPC) {
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continue
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} else {
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return fmt.Errorf("sysctl %q is not allowed in the hosts ipc namespace", s)
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}
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}
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if strings.HasPrefix(s, "net.") {
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if config.Namespaces.Contains(configs.NEWNET) {
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continue
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} else {
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return fmt.Errorf("sysctl %q is not allowed in the hosts network namespace", s)
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}
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}
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return fmt.Errorf("sysctl %q is not in a separate kernel namespace", s)
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}
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return nil
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}
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