From 714718794236245e81d4552f30731157d731aa9d Mon Sep 17 00:00:00 2001 From: Brent Baude Date: Tue, 14 Apr 2020 14:13:06 -0500 Subject: v2specgen prune libpod use libpod only in the specgen/generate package so that the remote clients do not inherit libpod bloat. Signed-off-by: Brent Baude --- pkg/specgen/generate/oci.go | 259 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 259 insertions(+) create mode 100644 pkg/specgen/generate/oci.go (limited to 'pkg/specgen/generate/oci.go') diff --git a/pkg/specgen/generate/oci.go b/pkg/specgen/generate/oci.go new file mode 100644 index 000000000..4bc4d2327 --- /dev/null +++ b/pkg/specgen/generate/oci.go @@ -0,0 +1,259 @@ +package generate + +import ( + "strings" + + "github.com/containers/libpod/libpod" + "github.com/containers/libpod/libpod/image" + "github.com/containers/libpod/pkg/rootless" + createconfig "github.com/containers/libpod/pkg/spec" + "github.com/containers/libpod/pkg/specgen" + spec "github.com/opencontainers/runtime-spec/specs-go" + "github.com/opencontainers/runtime-tools/generate" +) + +func SpecGenToOCI(s *specgen.SpecGenerator, rt *libpod.Runtime, newImage *image.Image) (*spec.Spec, error) { + var ( + inUserNS bool + ) + cgroupPerm := "ro" + g, err := generate.New("linux") + if err != nil { + return nil, err + } + // Remove the default /dev/shm mount to ensure we overwrite it + g.RemoveMount("/dev/shm") + g.HostSpecific = true + addCgroup := true + canMountSys := true + + isRootless := rootless.IsRootless() + if isRootless { + inUserNS = true + } + if !s.UserNS.IsHost() { + if s.UserNS.IsContainer() || s.UserNS.IsPath() { + inUserNS = true + } + if s.UserNS.IsPrivate() { + inUserNS = true + } + } + if inUserNS && s.NetNS.IsHost() { + canMountSys = false + } + + if s.Privileged && canMountSys { + cgroupPerm = "rw" + g.RemoveMount("/sys") + sysMnt := spec.Mount{ + Destination: "/sys", + Type: "sysfs", + Source: "sysfs", + Options: []string{"rprivate", "nosuid", "noexec", "nodev", "rw"}, + } + g.AddMount(sysMnt) + } else if !canMountSys { + addCgroup = false + g.RemoveMount("/sys") + r := "ro" + if s.Privileged { + r = "rw" + } + sysMnt := spec.Mount{ + Destination: "/sys", + Type: "bind", // should we use a constant for this, like createconfig? + Source: "/sys", + Options: []string{"rprivate", "nosuid", "noexec", "nodev", r, "rbind"}, + } + g.AddMount(sysMnt) + if !s.Privileged && isRootless { + g.AddLinuxMaskedPaths("/sys/kernel") + } + } + gid5Available := true + if isRootless { + nGids, err := createconfig.GetAvailableGids() + if err != nil { + return nil, err + } + gid5Available = nGids >= 5 + } + // When using a different user namespace, check that the GID 5 is mapped inside + // the container. + if gid5Available && (s.IDMappings != nil && len(s.IDMappings.GIDMap) > 0) { + mappingFound := false + for _, r := range s.IDMappings.GIDMap { + if r.ContainerID <= 5 && 5 < r.ContainerID+r.Size { + mappingFound = true + break + } + } + if !mappingFound { + gid5Available = false + } + + } + if !gid5Available { + // If we have no GID mappings, the gid=5 default option would fail, so drop it. + g.RemoveMount("/dev/pts") + devPts := spec.Mount{ + Destination: "/dev/pts", + Type: "devpts", + Source: "devpts", + Options: []string{"rprivate", "nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620"}, + } + g.AddMount(devPts) + } + + if inUserNS && s.IpcNS.IsHost() { + g.RemoveMount("/dev/mqueue") + devMqueue := spec.Mount{ + Destination: "/dev/mqueue", + Type: "bind", // constant ? + Source: "/dev/mqueue", + Options: []string{"bind", "nosuid", "noexec", "nodev"}, + } + g.AddMount(devMqueue) + } + if inUserNS && s.PidNS.IsHost() { + g.RemoveMount("/proc") + procMount := spec.Mount{ + Destination: "/proc", + Type: createconfig.TypeBind, + Source: "/proc", + Options: []string{"rbind", "nosuid", "noexec", "nodev"}, + } + g.AddMount(procMount) + } + + if addCgroup { + cgroupMnt := spec.Mount{ + Destination: "/sys/fs/cgroup", + Type: "cgroup", + Source: "cgroup", + Options: []string{"rprivate", "nosuid", "noexec", "nodev", "relatime", cgroupPerm}, + } + g.AddMount(cgroupMnt) + } + g.SetProcessCwd(s.WorkDir) + g.SetProcessArgs(s.Command) + g.SetProcessTerminal(s.Terminal) + + for key, val := range s.Annotations { + g.AddAnnotation(key, val) + } + g.AddProcessEnv("container", "podman") + + g.Config.Linux.Resources = s.ResourceLimits + + // Devices + if s.Privileged { + // If privileged, we need to add all the host devices to the + // spec. We do not add the user provided ones because we are + // already adding them all. + if err := createconfig.AddPrivilegedDevices(&g); err != nil { + return nil, err + } + } else { + for _, device := range s.Devices { + if err := createconfig.DevicesFromPath(&g, device.Path); err != nil { + return nil, err + } + } + } + + // SECURITY OPTS + g.SetProcessNoNewPrivileges(s.NoNewPrivileges) + + if !s.Privileged { + g.SetProcessApparmorProfile(s.ApparmorProfile) + } + + createconfig.BlockAccessToKernelFilesystems(s.Privileged, s.PidNS.IsHost(), &g) + + for name, val := range s.Env { + g.AddProcessEnv(name, val) + } + + // TODO rlimits and ulimits needs further refinement by someone more + // familiar with the code. + //if err := addRlimits(config, &g); err != nil { + // return nil, err + //} + + // NAMESPACES + + if err := pidConfigureGenerator(s, &g); err != nil { + return nil, err + } + + if err := userConfigureGenerator(s, &g); err != nil { + return nil, err + } + + if err := networkConfigureGenerator(s, &g); err != nil { + return nil, err + } + + if err := utsConfigureGenerator(s, &g, rt); err != nil { + return nil, err + } + + if err := ipcConfigureGenerator(s, &g); err != nil { + return nil, err + } + + if err := cgroupConfigureGenerator(s, &g); err != nil { + return nil, err + } + configSpec := g.Config + + if err := securityConfigureGenerator(s, &g, newImage); err != nil { + return nil, err + } + + // BIND MOUNTS + configSpec.Mounts = createconfig.SupercedeUserMounts(s.Mounts, configSpec.Mounts) + // Process mounts to ensure correct options + if err := createconfig.InitFSMounts(configSpec.Mounts); err != nil { + return nil, err + } + + // Add annotations + if configSpec.Annotations == nil { + configSpec.Annotations = make(map[string]string) + } + + // TODO cidfile is not in specgen; when wiring up cli, we will need to move this out of here + // leaving as a reminder + //if config.CidFile != "" { + // configSpec.Annotations[libpod.InspectAnnotationCIDFile] = config.CidFile + //} + + if s.Remove { + configSpec.Annotations[libpod.InspectAnnotationAutoremove] = libpod.InspectResponseTrue + } else { + configSpec.Annotations[libpod.InspectAnnotationAutoremove] = libpod.InspectResponseFalse + } + + if len(s.VolumesFrom) > 0 { + configSpec.Annotations[libpod.InspectAnnotationVolumesFrom] = strings.Join(s.VolumesFrom, ",") + } + + if s.Privileged { + configSpec.Annotations[libpod.InspectAnnotationPrivileged] = libpod.InspectResponseTrue + } else { + configSpec.Annotations[libpod.InspectAnnotationPrivileged] = libpod.InspectResponseFalse + } + + // TODO Init might not make it into the specgen and therefore is not available here. We should deal + // with this when we wire up the CLI; leaving as a reminder + //if s.Init { + // configSpec.Annotations[libpod.InspectAnnotationInit] = libpod.InspectResponseTrue + //} else { + // configSpec.Annotations[libpod.InspectAnnotationInit] = libpod.InspectResponseFalse + //} + + return configSpec, nil +} -- cgit v1.2.3-54-g00ecf