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package generate
import (
"strings"
"github.com/containers/common/pkg/apparmor"
"github.com/containers/common/pkg/capabilities"
"github.com/containers/common/pkg/config"
"github.com/containers/podman/v3/libpod"
"github.com/containers/podman/v3/libpod/define"
"github.com/containers/podman/v3/libpod/image"
"github.com/containers/podman/v3/pkg/specgen"
"github.com/containers/podman/v3/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 setupApparmor(s *specgen.SpecGenerator, rtc *config.Config, g *generate.Generator) error {
hasProfile := len(s.ApparmorProfile) > 0
if !apparmor.IsEnabled() {
if hasProfile && s.ApparmorProfile != "unconfined" {
return errors.Errorf("Apparmor profile %q specified, but Apparmor is not enabled on this system", s.ApparmorProfile)
}
return nil
}
// If privileged and caller did not specify apparmor profiles return
if s.Privileged && !hasProfile {
return nil
}
if !hasProfile {
s.ApparmorProfile = rtc.Containers.ApparmorProfile
}
if len(s.ApparmorProfile) > 0 {
g.SetProcessApparmorProfile(s.ApparmorProfile)
}
return nil
}
func securityConfigureGenerator(s *specgen.SpecGenerator, g *generate.Generator, newImage *image.Image, rtc *config.Config) error {
var (
caplist []string
err error
)
// HANDLE CAPABILITIES
// NOTE: Must happen before SECCOMP
if s.Privileged {
g.SetupPrivileged(true)
caplist = capabilities.AllCapabilities()
} else {
caplist, err = capabilities.MergeCapabilities(rtc.Containers.DefaultCapabilities, 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 {
return errors.Wrapf(err, "capabilities requested by user or image are not valid: %q", strings.Join(capsRequired, ","))
}
// Verify all capRequired 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 := g.Config
configSpec.Process.Capabilities.Ambient = []string{}
configSpec.Process.Capabilities.Bounding = caplist
user := strings.Split(s.User, ":")[0]
if (user == "" && s.UserNS.NSMode != specgen.KeepID) || user == "root" || user == "0" {
configSpec.Process.Capabilities.Effective = caplist
configSpec.Process.Capabilities.Permitted = caplist
configSpec.Process.Capabilities.Inheritable = caplist
} else {
userCaps, err := capabilities.MergeCapabilities(nil, s.CapAdd, nil)
if err != nil {
return errors.Wrapf(err, "capabilities requested by user are not valid: %q", strings.Join(s.CapAdd, ","))
}
configSpec.Process.Capabilities.Effective = userCaps
configSpec.Process.Capabilities.Permitted = userCaps
configSpec.Process.Capabilities.Inheritable = userCaps
// Ambient capabilities were added to Linux 4.3. Set ambient
// capabilities only when the kernel supports them.
if supportAmbientCapabilities() {
configSpec.Process.Capabilities.Ambient = userCaps
}
}
g.SetProcessNoNewPrivileges(s.NoNewPrivileges)
if err := setupApparmor(s, rtc, g); err != nil {
return err
}
// 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 unconfined containers
// and privileged containers which do not specify a seccomp profile.
if s.SeccompProfilePath == "unconfined" || (s.Privileged && (s.SeccompProfilePath == "" || s.SeccompProfilePath == config.SeccompOverridePath || s.SeccompProfilePath == config.SeccompDefaultPath)) {
configSpec.Linux.Seccomp = nil
}
g.SetRootReadonly(s.ReadOnlyFilesystem)
noUseIPC := s.IpcNS.NSMode == specgen.FromContainer || s.IpcNS.NSMode == specgen.FromPod || s.IpcNS.NSMode == specgen.Host
noUseNet := s.NetNS.NSMode == specgen.FromContainer || s.NetNS.NSMode == specgen.FromPod || s.NetNS.NSMode == specgen.Host
noUseUTS := s.UtsNS.NSMode == specgen.FromContainer || s.UtsNS.NSMode == specgen.FromPod || s.UtsNS.NSMode == specgen.Host
// Add default sysctls
defaultSysctls, err := util.ValidateSysctls(rtc.Sysctls())
if err != nil {
return err
}
for sysctlKey, sysctlVal := range defaultSysctls {
// Ignore mqueue sysctls if --ipc=host
if noUseIPC && strings.HasPrefix(sysctlKey, "fs.mqueue.") {
logrus.Infof("Sysctl %s=%s ignored in containers.conf, since IPC Namespace set to host", sysctlKey, sysctlVal)
continue
}
// Ignore net sysctls if --net=host
if noUseNet && strings.HasPrefix(sysctlKey, "net.") {
logrus.Infof("Sysctl %s=%s ignored in containers.conf, since Network Namespace set to host", sysctlKey, sysctlVal)
continue
}
// Ignore uts sysctls if --uts=host
if noUseUTS && (strings.HasPrefix(sysctlKey, "kernel.domainname") || strings.HasPrefix(sysctlKey, "kernel.hostname")) {
logrus.Infof("Sysctl %s=%s ignored in containers.conf, since UTS Namespace set to host", sysctlKey, sysctlVal)
continue
}
g.AddLinuxSysctl(sysctlKey, sysctlVal)
}
for sysctlKey, sysctlVal := range s.Sysctl {
if s.IpcNS.IsHost() && strings.HasPrefix(sysctlKey, "fs.mqueue.") {
return errors.Wrapf(define.ErrInvalidArg, "sysctl %s=%s can't be set since IPC Namespace set to host", sysctlKey, sysctlVal)
}
// Ignore net sysctls if --net=host
if s.NetNS.IsHost() && strings.HasPrefix(sysctlKey, "net.") {
return errors.Wrapf(define.ErrInvalidArg, "sysctl %s=%s can't be set since Host Namespace set to host", sysctlKey, sysctlVal)
}
// Ignore uts sysctls if --uts=host
if s.UtsNS.IsHost() && (strings.HasPrefix(sysctlKey, "kernel.domainname") || strings.HasPrefix(sysctlKey, "kernel.hostname")) {
return errors.Wrapf(define.ErrInvalidArg, "sysctl %s=%s can't be set since UTS Namespace set to host", sysctlKey, sysctlVal)
}
g.AddLinuxSysctl(sysctlKey, sysctlVal)
}
return nil
}
|
