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package generate
import (
"strings"
"github.com/containers/common/pkg/capabilities"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/libpod/image"
"github.com/containers/libpod/pkg/specgen"
"github.com/containers/libpod/pkg/util"
"github.com/opencontainers/runtime-tools/generate"
"github.com/opencontainers/selinux/go-selinux/label"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// setLabelOpts sets the label options of the SecurityConfig according to the
// input.
func setLabelOpts(s *specgen.SpecGenerator, runtime *libpod.Runtime, pidConfig specgen.Namespace, ipcConfig specgen.Namespace) error {
if !runtime.EnableLabeling() || s.Privileged {
s.SelinuxOpts = label.DisableSecOpt()
return nil
}
var labelOpts []string
if pidConfig.IsHost() {
labelOpts = append(labelOpts, label.DisableSecOpt()...)
} else if pidConfig.IsContainer() {
ctr, err := runtime.LookupContainer(pidConfig.Value)
if err != nil {
return errors.Wrapf(err, "container %q not found", pidConfig.Value)
}
secopts, err := label.DupSecOpt(ctr.ProcessLabel())
if err != nil {
return errors.Wrapf(err, "failed to duplicate label %q ", ctr.ProcessLabel())
}
labelOpts = append(labelOpts, secopts...)
}
if ipcConfig.IsHost() {
labelOpts = append(labelOpts, label.DisableSecOpt()...)
} else if ipcConfig.IsContainer() {
ctr, err := runtime.LookupContainer(ipcConfig.Value)
if err != nil {
return errors.Wrapf(err, "container %q not found", ipcConfig.Value)
}
secopts, err := label.DupSecOpt(ctr.ProcessLabel())
if err != nil {
return errors.Wrapf(err, "failed to duplicate label %q ", ctr.ProcessLabel())
}
labelOpts = append(labelOpts, secopts...)
}
s.SelinuxOpts = append(s.SelinuxOpts, labelOpts...)
return nil
}
func securityConfigureGenerator(s *specgen.SpecGenerator, g *generate.Generator, newImage *image.Image) error {
// HANDLE CAPABILITIES
// NOTE: Must happen before SECCOMP
if s.Privileged {
g.SetupPrivileged(true)
}
useNotRoot := func(user string) bool {
if user == "" || user == "root" || user == "0" {
return false
}
return true
}
configSpec := g.Config
var err error
var caplist []string
bounding := configSpec.Process.Capabilities.Bounding
if useNotRoot(s.User) {
configSpec.Process.Capabilities.Bounding = caplist
}
caplist, err = capabilities.MergeCapabilities(configSpec.Process.Capabilities.Bounding, s.CapAdd, s.CapDrop)
if err != nil {
return err
}
privCapsRequired := []string{}
// If the container image specifies an label with a
// capabilities.ContainerImageLabel then split the comma separated list
// of capabilities and record them. This list indicates the only
// capabilities, required to run the container.
var capsRequiredRequested []string
for key, val := range s.Labels {
if util.StringInSlice(key, capabilities.ContainerImageLabels) {
capsRequiredRequested = strings.Split(val, ",")
}
}
if !s.Privileged && len(capsRequiredRequested) > 0 {
// Pass capRequiredRequested in CapAdd field to normalize capabilities names
capsRequired, err := capabilities.MergeCapabilities(nil, capsRequiredRequested, nil)
if err != nil {
logrus.Errorf("capabilities requested by user or image are not valid: %q", strings.Join(capsRequired, ","))
} else {
// Verify all capRequiered are in the capList
for _, cap := range capsRequired {
if !util.StringInSlice(cap, caplist) {
privCapsRequired = append(privCapsRequired, cap)
}
}
}
if len(privCapsRequired) == 0 {
caplist = capsRequired
} else {
logrus.Errorf("capabilities requested by user or image are not allowed by default: %q", strings.Join(privCapsRequired, ","))
}
}
configSpec.Process.Capabilities.Bounding = caplist
configSpec.Process.Capabilities.Permitted = caplist
configSpec.Process.Capabilities.Inheritable = caplist
configSpec.Process.Capabilities.Effective = caplist
configSpec.Process.Capabilities.Ambient = caplist
if useNotRoot(s.User) {
caplist, err = capabilities.MergeCapabilities(bounding, s.CapAdd, s.CapDrop)
if err != nil {
return err
}
}
configSpec.Process.Capabilities.Bounding = caplist
// HANDLE SECCOMP
if s.SeccompProfilePath != "unconfined" {
seccompConfig, err := getSeccompConfig(s, configSpec, newImage)
if err != nil {
return err
}
configSpec.Linux.Seccomp = seccompConfig
}
// Clear default Seccomp profile from Generator for privileged containers
if s.SeccompProfilePath == "unconfined" || s.Privileged {
configSpec.Linux.Seccomp = nil
}
g.SetRootReadonly(s.ReadOnlyFilesystem)
for sysctlKey, sysctlVal := range s.Sysctl {
g.AddLinuxSysctl(sysctlKey, sysctlVal)
}
return nil
}
|
