656 lines
16 KiB
Go
656 lines
16 KiB
Go
// +build linux
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package main
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"syscall"
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"github.com/Sirupsen/logrus"
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"github.com/codegangsta/cli"
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"github.com/opencontainers/runc/libcontainer/cgroups"
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"github.com/opencontainers/runc/libcontainer/configs"
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"github.com/opencontainers/runc/libcontainer/seccomp"
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"github.com/opencontainers/specs"
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)
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var specCommand = cli.Command{
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Name: "spec",
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Usage: "create a new specification file",
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Flags: []cli.Flag{
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cli.StringFlag{
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Name: "config-file, c",
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Value: "config.json",
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Usage: "path to spec config file for writing",
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},
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cli.StringFlag{
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Name: "runtime-file, r",
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Value: "runtime.json",
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Usage: "path to runtime config file for writing",
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},
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},
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Action: func(context *cli.Context) {
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spec := specs.LinuxSpec{
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Spec: specs.Spec{
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Version: specs.Version,
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Platform: specs.Platform{
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OS: runtime.GOOS,
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Arch: runtime.GOARCH,
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},
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Root: specs.Root{
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Path: "rootfs",
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Readonly: true,
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},
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Process: specs.Process{
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Terminal: true,
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User: specs.User{},
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Args: []string{
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"sh",
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},
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Env: []string{
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"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
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"TERM=xterm",
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},
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},
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Hostname: "shell",
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Mounts: []specs.MountPoint{
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{
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Name: "proc",
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Path: "/proc",
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},
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{
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Name: "dev",
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Path: "/dev",
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},
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{
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Name: "devpts",
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Path: "/dev/pts",
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},
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{
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Name: "shm",
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Path: "/dev/shm",
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},
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{
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Name: "mqueue",
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Path: "/dev/mqueue",
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},
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{
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Name: "sysfs",
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Path: "/sys",
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},
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{
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Name: "cgroup",
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Path: "/sys/fs/cgroup",
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},
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},
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},
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Linux: specs.Linux{
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Capabilities: []string{
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"CAP_AUDIT_WRITE",
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"CAP_KILL",
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"CAP_NET_BIND_SERVICE",
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},
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},
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}
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rspec := specs.LinuxRuntimeSpec{
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RuntimeSpec: specs.RuntimeSpec{
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Mounts: map[string]specs.Mount{
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"proc": {
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Type: "proc",
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Source: "proc",
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Options: nil,
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},
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"dev": {
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Type: "tmpfs",
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Source: "tmpfs",
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Options: []string{"nosuid", "strictatime", "mode=755", "size=65536k"},
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},
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"devpts": {
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Type: "devpts",
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Source: "devpts",
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Options: []string{"nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620", "gid=5"},
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},
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"shm": {
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Type: "tmpfs",
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Source: "shm",
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Options: []string{"nosuid", "noexec", "nodev", "mode=1777", "size=65536k"},
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},
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"mqueue": {
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Type: "mqueue",
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Source: "mqueue",
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Options: []string{"nosuid", "noexec", "nodev"},
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},
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"sysfs": {
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Type: "sysfs",
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Source: "sysfs",
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Options: []string{"nosuid", "noexec", "nodev"},
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},
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"cgroup": {
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Type: "cgroup",
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Source: "cgroup",
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Options: []string{"nosuid", "noexec", "nodev", "relatime", "ro"},
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},
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},
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},
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Linux: specs.LinuxRuntime{
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Namespaces: []specs.Namespace{
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{
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Type: "pid",
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},
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{
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Type: "network",
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},
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{
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Type: "ipc",
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},
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{
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Type: "uts",
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},
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{
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Type: "mount",
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},
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},
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Rlimits: []specs.Rlimit{
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{
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Type: "RLIMIT_NOFILE",
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Hard: uint64(1024),
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Soft: uint64(1024),
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},
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},
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Devices: []specs.Device{
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{
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Type: 'c',
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Path: "/dev/null",
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Major: 1,
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Minor: 3,
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Permissions: "rwm",
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FileMode: 0666,
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UID: 0,
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GID: 0,
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},
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{
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Type: 'c',
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Path: "/dev/random",
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Major: 1,
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Minor: 8,
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Permissions: "rwm",
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FileMode: 0666,
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UID: 0,
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GID: 0,
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},
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{
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Type: 'c',
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Path: "/dev/full",
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Major: 1,
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Minor: 7,
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Permissions: "rwm",
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FileMode: 0666,
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UID: 0,
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GID: 0,
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},
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{
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Type: 'c',
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Path: "/dev/tty",
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Major: 5,
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Minor: 0,
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Permissions: "rwm",
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FileMode: 0666,
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UID: 0,
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GID: 0,
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},
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{
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Type: 'c',
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Path: "/dev/zero",
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Major: 1,
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Minor: 5,
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Permissions: "rwm",
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FileMode: 0666,
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UID: 0,
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GID: 0,
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},
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{
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Type: 'c',
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Path: "/dev/urandom",
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Major: 1,
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Minor: 9,
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Permissions: "rwm",
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FileMode: 0666,
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UID: 0,
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GID: 0,
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},
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},
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Resources: &specs.Resources{
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Memory: specs.Memory{
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Swappiness: -1,
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},
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},
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Seccomp: specs.Seccomp{
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DefaultAction: "SCMP_ACT_ALLOW",
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Syscalls: []*specs.Syscall{},
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},
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},
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}
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checkNoFile := func(name string) error {
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_, err := os.Stat(name)
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if err == nil {
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return fmt.Errorf("File %s exists. Remove it first", name)
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}
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if !os.IsNotExist(err) {
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return err
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}
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return nil
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}
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cName := context.String("config-file")
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rName := context.String("runtime-file")
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if err := checkNoFile(cName); err != nil {
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logrus.Fatal(err)
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}
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if err := checkNoFile(rName); err != nil {
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logrus.Fatal(err)
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}
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data, err := json.MarshalIndent(&spec, "", "\t")
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if err != nil {
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logrus.Fatal(err)
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}
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if err := ioutil.WriteFile(cName, data, 0666); err != nil {
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logrus.Fatal(err)
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}
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rdata, err := json.MarshalIndent(&rspec, "", "\t")
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if err != nil {
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logrus.Fatal(err)
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}
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if err := ioutil.WriteFile(rName, rdata, 0666); err != nil {
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logrus.Fatal(err)
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}
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},
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}
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var namespaceMapping = map[specs.NamespaceType]configs.NamespaceType{
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specs.PIDNamespace: configs.NEWPID,
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specs.NetworkNamespace: configs.NEWNET,
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specs.MountNamespace: configs.NEWNS,
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specs.UserNamespace: configs.NEWUSER,
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specs.IPCNamespace: configs.NEWIPC,
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specs.UTSNamespace: configs.NEWUTS,
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}
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// loadSpec loads the specification from the provided path.
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// If the path is empty then the default path will be "config.json"
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func loadSpec(cPath, rPath string) (spec *specs.LinuxSpec, rspec *specs.LinuxRuntimeSpec, err error) {
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cf, err := os.Open(cPath)
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if err != nil {
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if os.IsNotExist(err) {
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return nil, nil, fmt.Errorf("JSON specification file at %s not found", cPath)
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}
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return
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}
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defer cf.Close()
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rf, err := os.Open(rPath)
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if err != nil {
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if os.IsNotExist(err) {
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return nil, nil, fmt.Errorf("JSON runtime config file at %s not found", rPath)
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}
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return
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}
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defer rf.Close()
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if err = json.NewDecoder(cf).Decode(&spec); err != nil {
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return
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}
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if err = json.NewDecoder(rf).Decode(&rspec); err != nil {
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return
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}
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return spec, rspec, checkSpecVersion(spec)
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}
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// checkSpecVersion makes sure that the spec version matches runc's while we are in the initial
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// development period. It is better to hard fail than have missing fields or options in the spec.
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func checkSpecVersion(s *specs.LinuxSpec) error {
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if s.Version != specs.Version {
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return fmt.Errorf("spec version is not compatible with implemented version %q: spec %q", specs.Version, s.Version)
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}
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return nil
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}
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func createLibcontainerConfig(cgroupName string, spec *specs.LinuxSpec, rspec *specs.LinuxRuntimeSpec) (*configs.Config, error) {
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cwd, err := os.Getwd()
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if err != nil {
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return nil, err
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}
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rootfsPath := spec.Root.Path
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if !filepath.IsAbs(rootfsPath) {
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rootfsPath = filepath.Join(cwd, rootfsPath)
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}
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config := &configs.Config{
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Rootfs: rootfsPath,
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Capabilities: spec.Linux.Capabilities,
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Readonlyfs: spec.Root.Readonly,
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Hostname: spec.Hostname,
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Privatefs: true,
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}
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for _, ns := range rspec.Linux.Namespaces {
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t, exists := namespaceMapping[ns.Type]
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if !exists {
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return nil, fmt.Errorf("namespace %q does not exist", ns)
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}
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config.Namespaces.Add(t, ns.Path)
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}
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if config.Namespaces.Contains(configs.NEWNET) {
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config.Networks = []*configs.Network{
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{
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Type: "loopback",
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},
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}
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}
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for _, mp := range spec.Mounts {
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m, ok := rspec.Mounts[mp.Name]
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if !ok {
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return nil, fmt.Errorf("Mount with Name %q not found in runtime config", mp.Name)
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}
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config.Mounts = append(config.Mounts, createLibcontainerMount(cwd, mp.Path, m))
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}
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if err := createDevices(rspec, config); err != nil {
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return nil, err
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}
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if err := setupUserNamespace(rspec, config); err != nil {
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return nil, err
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}
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for _, rlimit := range rspec.Linux.Rlimits {
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rl, err := createLibContainerRlimit(rlimit)
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if err != nil {
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return nil, err
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}
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config.Rlimits = append(config.Rlimits, rl)
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}
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c, err := createCgroupConfig(cgroupName, rspec, config.Devices)
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if err != nil {
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return nil, err
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}
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config.Cgroups = c
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if config.Readonlyfs {
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setReadonly(config)
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config.MaskPaths = []string{
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"/proc/kcore",
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}
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config.ReadonlyPaths = []string{
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"/proc/sys", "/proc/sysrq-trigger", "/proc/irq", "/proc/bus",
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}
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}
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seccomp, err := setupSeccomp(&rspec.Linux.Seccomp)
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if err != nil {
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return nil, err
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}
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config.Seccomp = seccomp
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config.Sysctl = rspec.Linux.Sysctl
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config.ProcessLabel = rspec.Linux.SelinuxProcessLabel
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config.AppArmorProfile = rspec.Linux.ApparmorProfile
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return config, nil
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}
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func createLibcontainerMount(cwd, dest string, m specs.Mount) *configs.Mount {
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flags, pgflags, data := parseMountOptions(m.Options)
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source := m.Source
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if m.Type == "bind" {
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if !filepath.IsAbs(source) {
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source = filepath.Join(cwd, m.Source)
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}
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}
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return &configs.Mount{
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Device: m.Type,
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Source: source,
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Destination: dest,
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Data: data,
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Flags: flags,
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PropagationFlags: pgflags,
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}
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}
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func createCgroupConfig(name string, spec *specs.LinuxRuntimeSpec, devices []*configs.Device) (*configs.Cgroup, error) {
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myCgroupPath, err := cgroups.GetThisCgroupDir("devices")
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if err != nil {
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return nil, err
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}
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c := &configs.Cgroup{
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Name: name,
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Parent: myCgroupPath,
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AllowedDevices: append(devices, allowedDevices...),
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}
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r := spec.Linux.Resources
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c.Memory = r.Memory.Limit
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c.MemoryReservation = r.Memory.Reservation
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c.MemorySwap = r.Memory.Swap
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c.KernelMemory = r.Memory.Kernel
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c.MemorySwappiness = r.Memory.Swappiness
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c.CpuShares = r.CPU.Shares
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c.CpuQuota = r.CPU.Quota
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c.CpuPeriod = r.CPU.Period
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c.CpuRtRuntime = r.CPU.RealtimeRuntime
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c.CpuRtPeriod = r.CPU.RealtimePeriod
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c.CpusetCpus = r.CPU.Cpus
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c.CpusetMems = r.CPU.Mems
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c.BlkioThrottleReadBpsDevice = r.BlockIO.ThrottleReadBpsDevice
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c.BlkioThrottleWriteBpsDevice = r.BlockIO.ThrottleWriteBpsDevice
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c.BlkioThrottleReadIOpsDevice = r.BlockIO.ThrottleReadIOpsDevice
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c.BlkioThrottleWriteIOpsDevice = r.BlockIO.ThrottleWriteIOpsDevice
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c.BlkioWeight = r.BlockIO.Weight
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c.BlkioWeightDevice = r.BlockIO.WeightDevice
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for _, l := range r.HugepageLimits {
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c.HugetlbLimit = append(c.HugetlbLimit, &configs.HugepageLimit{
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Pagesize: l.Pagesize,
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Limit: l.Limit,
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})
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}
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c.OomKillDisable = r.DisableOOMKiller
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c.NetClsClassid = r.Network.ClassID
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for _, m := range r.Network.Priorities {
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c.NetPrioIfpriomap = append(c.NetPrioIfpriomap, &configs.IfPrioMap{
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Interface: m.Name,
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Priority: m.Priority,
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})
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}
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return c, nil
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}
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func createDevices(spec *specs.LinuxRuntimeSpec, config *configs.Config) error {
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for _, d := range spec.Linux.Devices {
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device := &configs.Device{
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Type: d.Type,
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Path: d.Path,
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Major: d.Major,
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Minor: d.Minor,
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Permissions: d.Permissions,
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FileMode: d.FileMode,
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Uid: d.UID,
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Gid: d.GID,
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}
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config.Devices = append(config.Devices, device)
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}
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return nil
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}
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func setReadonly(config *configs.Config) {
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for _, m := range config.Mounts {
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if m.Device == "sysfs" {
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m.Flags |= syscall.MS_RDONLY
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}
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}
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}
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func setupUserNamespace(spec *specs.LinuxRuntimeSpec, config *configs.Config) error {
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if len(spec.Linux.UIDMappings) == 0 {
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return nil
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}
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config.Namespaces.Add(configs.NEWUSER, "")
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create := func(m specs.IDMapping) configs.IDMap {
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return configs.IDMap{
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HostID: int(m.HostID),
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ContainerID: int(m.ContainerID),
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Size: int(m.Size),
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}
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}
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for _, m := range spec.Linux.UIDMappings {
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config.UidMappings = append(config.UidMappings, create(m))
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}
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for _, m := range spec.Linux.GIDMappings {
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config.GidMappings = append(config.GidMappings, create(m))
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}
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rootUID, err := config.HostUID()
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if err != nil {
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return err
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}
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rootGID, err := config.HostGID()
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if err != nil {
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return err
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}
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for _, node := range config.Devices {
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node.Uid = uint32(rootUID)
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node.Gid = uint32(rootGID)
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}
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return nil
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}
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func createLibContainerRlimit(rlimit specs.Rlimit) (configs.Rlimit, error) {
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rl, err := strToRlimit(rlimit.Type)
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if err != nil {
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return configs.Rlimit{}, err
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}
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return configs.Rlimit{
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Type: rl,
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Hard: uint64(rlimit.Hard),
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Soft: uint64(rlimit.Soft),
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}, nil
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}
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// parseMountOptions parses the string and returns the flags, propagation
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// flags and any mount data that it contains.
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func parseMountOptions(options []string) (int, []int, string) {
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var (
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flag int
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pgflag []int
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data []string
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)
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flags := map[string]struct {
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clear bool
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flag int
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}{
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"async": {true, syscall.MS_SYNCHRONOUS},
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"atime": {true, syscall.MS_NOATIME},
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"bind": {false, syscall.MS_BIND},
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"defaults": {false, 0},
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"dev": {true, syscall.MS_NODEV},
|
|
"diratime": {true, syscall.MS_NODIRATIME},
|
|
"dirsync": {false, syscall.MS_DIRSYNC},
|
|
"exec": {true, syscall.MS_NOEXEC},
|
|
"mand": {false, syscall.MS_MANDLOCK},
|
|
"noatime": {false, syscall.MS_NOATIME},
|
|
"nodev": {false, syscall.MS_NODEV},
|
|
"nodiratime": {false, syscall.MS_NODIRATIME},
|
|
"noexec": {false, syscall.MS_NOEXEC},
|
|
"nomand": {true, syscall.MS_MANDLOCK},
|
|
"norelatime": {true, syscall.MS_RELATIME},
|
|
"nostrictatime": {true, syscall.MS_STRICTATIME},
|
|
"nosuid": {false, syscall.MS_NOSUID},
|
|
"rbind": {false, syscall.MS_BIND | syscall.MS_REC},
|
|
"relatime": {false, syscall.MS_RELATIME},
|
|
"remount": {false, syscall.MS_REMOUNT},
|
|
"ro": {false, syscall.MS_RDONLY},
|
|
"rw": {true, syscall.MS_RDONLY},
|
|
"strictatime": {false, syscall.MS_STRICTATIME},
|
|
"suid": {true, syscall.MS_NOSUID},
|
|
"sync": {false, syscall.MS_SYNCHRONOUS},
|
|
}
|
|
propagationFlags := map[string]struct {
|
|
clear bool
|
|
flag int
|
|
}{
|
|
"private": {false, syscall.MS_PRIVATE},
|
|
"shared": {false, syscall.MS_SHARED},
|
|
"slave": {false, syscall.MS_SLAVE},
|
|
"unbindable": {false, syscall.MS_UNBINDABLE},
|
|
"rprivate": {false, syscall.MS_PRIVATE | syscall.MS_REC},
|
|
"rshared": {false, syscall.MS_SHARED | syscall.MS_REC},
|
|
"rslave": {false, syscall.MS_SLAVE | syscall.MS_REC},
|
|
"runbindable": {false, syscall.MS_UNBINDABLE | syscall.MS_REC},
|
|
}
|
|
for _, o := range options {
|
|
// If the option does not exist in the flags table or the flag
|
|
// is not supported on the platform,
|
|
// then it is a data value for a specific fs type
|
|
if f, exists := flags[o]; exists && f.flag != 0 {
|
|
if f.clear {
|
|
flag &= ^f.flag
|
|
} else {
|
|
flag |= f.flag
|
|
}
|
|
} else if f, exists := propagationFlags[o]; exists && f.flag != 0 {
|
|
pgflag = append(pgflag, f.flag)
|
|
} else {
|
|
data = append(data, o)
|
|
}
|
|
}
|
|
return flag, pgflag, strings.Join(data, ",")
|
|
}
|
|
|
|
func setupSeccomp(config *specs.Seccomp) (*configs.Seccomp, error) {
|
|
if config == nil {
|
|
return nil, nil
|
|
}
|
|
|
|
// No default action specified, no syscalls listed, assume seccomp disabled
|
|
if config.DefaultAction == "" && len(config.Syscalls) == 0 {
|
|
return nil, nil
|
|
}
|
|
|
|
newConfig := new(configs.Seccomp)
|
|
newConfig.Syscalls = []*configs.Syscall{}
|
|
|
|
// Convert default action from string representation
|
|
newDefaultAction, err := seccomp.ConvertStringToAction(string(config.DefaultAction))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
newConfig.DefaultAction = newDefaultAction
|
|
|
|
// Loop through all syscall blocks and convert them to libcontainer format
|
|
for _, call := range config.Syscalls {
|
|
newAction, err := seccomp.ConvertStringToAction(string(call.Action))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
newCall := configs.Syscall{
|
|
Name: call.Name,
|
|
Action: newAction,
|
|
Args: []*configs.Arg{},
|
|
}
|
|
|
|
// Loop through all the arguments of the syscall and convert them
|
|
for _, arg := range call.Args {
|
|
newOp, err := seccomp.ConvertStringToOperator(string(arg.Op))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
newArg := configs.Arg{
|
|
Index: arg.Index,
|
|
Value: arg.Value,
|
|
ValueTwo: arg.ValueTwo,
|
|
Op: newOp,
|
|
}
|
|
|
|
newCall.Args = append(newCall.Args, &newArg)
|
|
}
|
|
|
|
newConfig.Syscalls = append(newConfig.Syscalls, &newCall)
|
|
}
|
|
|
|
return newConfig, nil
|
|
}
|