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criyle/go-sandbox#13
364 lines
9.4 KiB
Go
364 lines
9.4 KiB
Go
package env
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import (
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"context"
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"fmt"
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"os"
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"sync/atomic"
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"syscall"
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"github.com/coreos/go-systemd/v22/dbus"
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"github.com/criyle/go-judge/env/linuxcontainer"
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"github.com/criyle/go-judge/env/pool"
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"github.com/criyle/go-judge/envexec"
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"github.com/criyle/go-sandbox/container"
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"github.com/criyle/go-sandbox/pkg/cgroup"
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"github.com/criyle/go-sandbox/pkg/forkexec"
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"github.com/criyle/go-sandbox/pkg/mount"
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"github.com/criyle/go-sandbox/runner"
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ddbus "github.com/godbus/dbus/v5"
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"github.com/google/shlex"
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"golang.org/x/sys/unix"
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)
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const (
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containerName = "executor_server"
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defaultWorkDir = "/w"
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containerCredStart = 10000
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containerCred = 1000
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)
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// NewBuilder build a environment builder
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func NewBuilder(c Config) (pool.EnvBuilder, map[string]any, error) {
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var (
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mountBuilder *mount.Builder
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symbolicLinks []container.SymbolicLink
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maskPaths []string
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unshareCgroup bool = true
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)
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mc, err := readMountConfig(c.MountConf)
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if err != nil {
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if !os.IsNotExist(err) {
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return nil, nil, err
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}
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c.Info("Mount.yaml(", c.MountConf, ") does not exists, use the default container mount")
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mountBuilder = getDefaultMount(c.TmpFsParam)
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} else {
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mountBuilder, err = parseMountConfig(mc)
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if err != nil {
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return nil, nil, err
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}
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}
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if mc != nil && len(mc.SymLinks) > 0 {
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symbolicLinks = make([]container.SymbolicLink, 0, len(mc.SymLinks))
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for _, l := range mc.SymLinks {
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symbolicLinks = append(symbolicLinks, container.SymbolicLink{LinkPath: l.LinkPath, Target: l.Target})
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}
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} else {
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symbolicLinks = defaultSymLinks
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}
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if mc != nil && len(mc.MaskPaths) > 0 {
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maskPaths = mc.MaskPaths
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} else {
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maskPaths = defaultMaskPaths
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}
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m := mountBuilder.FilterNotExist().Mounts
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c.Info("Created container mount at:", mountBuilder)
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seccomp, err := readSeccompConf(c.SeccompConf)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to load seccomp config: %v", err)
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}
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if seccomp != nil {
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c.Info("Load seccomp filter: ", c.SeccompConf)
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}
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unshareFlags := uintptr(forkexec.UnshareFlags)
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if c.NetShare {
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unshareFlags ^= syscall.CLONE_NEWNET
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}
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major, minor := kernelVersion()
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unshareFlags ^= unix.CLONE_NEWCGROUP
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if major < 4 || (major == 4 && minor < 6) {
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unshareCgroup = false
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c.Info("Kernel version (", major, ".", minor, ") < 4.6, don't unshare cgroup")
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}
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// use setuid container only if running in root privilege
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var credGen container.CredGenerator
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if os.Getuid() == 0 && c.ContainerCredStart > 0 {
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credGen = newCredGen(uint32(c.ContainerCredStart))
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}
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hostName := containerName
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domainName := containerName
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workDir := defaultWorkDir
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cUID := containerCred
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cGID := containerCred
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var initCmd []string
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if mc != nil {
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hostName = mc.HostName
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domainName = mc.DomainName
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workDir = mc.WorkDir
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cUID = mc.UID
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cGID = mc.GID
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if mc.InitCmd != "" {
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initCmd, err = shlex.Split(mc.InitCmd)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to parse initCmd: %s %w", mc.InitCmd, err)
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}
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c.Info("Initialize container with command: ", mc.InitCmd)
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}
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}
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c.Info("Creating container builder: hostName=", hostName, ", domainName=", domainName, ", workDir=", workDir)
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b := &container.Builder{
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TmpRoot: "go-judge",
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Mounts: m,
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SymbolicLinks: symbolicLinks,
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MaskPaths: maskPaths,
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CredGenerator: credGen,
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Stderr: os.Stderr,
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CloneFlags: unshareFlags,
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ExecFile: c.ContainerInitPath,
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HostName: hostName,
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DomainName: domainName,
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InitCommand: initCmd,
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WorkDir: workDir,
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ContainerUID: cUID,
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ContainerGID: cGID,
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UnshareCgroupBeforeExec: unshareCgroup,
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}
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cgb, ct, err := newCgroup(c)
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if err != nil {
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return nil, nil, err
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}
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var cgroupPool linuxcontainer.CgroupPool
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if cgb != nil {
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cgroupPool = linuxcontainer.NewFakeCgroupPool(cgb, c.CPUCfsPeriod)
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}
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cgroupType := int(cgroup.DetectedCgroupType)
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if cgb == nil {
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cgroupType = 0
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}
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cgroupControllers := []string{}
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if ct != nil {
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cgroupControllers = ct.Names()
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}
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conf := map[string]any{
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"cgroupType": cgroupType,
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"mount": m,
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"symbolicLink": symbolicLinks,
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"maskedPaths": maskPaths,
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"hostName": hostName,
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"domainName": domainName,
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"workDir": workDir,
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"uid": cUID,
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"gid": cGID,
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"cgroupControllers": cgroupControllers,
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}
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if cgb != nil && cgroupType == cgroup.TypeV2 && major >= 5 && minor >= 7 {
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c.Info("Running kernel ", major, ".", minor, " >= 5.7 with cgroup V2, trying faster clone3(CLONE_INTO_CGROUP)")
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if b := func() pool.EnvBuilder {
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b := linuxcontainer.NewEnvBuilder(linuxcontainer.Config{
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Builder: b,
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CgroupPool: cgroupPool,
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WorkDir: workDir,
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Cpuset: c.Cpuset,
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CPURate: c.EnableCPURate,
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Seccomp: seccomp,
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CgroupFd: true,
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})
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e, err := b.Build()
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if err != nil {
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c.Info("Environment build failed: ", err)
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return nil
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}
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defer e.Destroy()
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p, err := e.Execve(context.TODO(), envexec.ExecveParam{
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Args: []string{"/usr/bin/env"},
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Limit: envexec.Limit{
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Memory: 256 << 20,
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Proc: 1,
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},
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})
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if err != nil {
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c.Info("Environment run failed: ", err)
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return nil
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}
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<-p.Done()
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r := p.Result()
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if r.Status == runner.StatusRunnerError {
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c.Info("Environment result failed: ", r)
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return nil
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}
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return b
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}(); b != nil {
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conf["clone3"] = true
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return b, conf, nil
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}
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}
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return linuxcontainer.NewEnvBuilder(linuxcontainer.Config{
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Builder: b,
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CgroupPool: cgroupPool,
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WorkDir: workDir,
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Cpuset: c.Cpuset,
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CPURate: c.EnableCPURate,
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Seccomp: seccomp,
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}), conf, nil
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}
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func newCgroup(c Config) (cgroup.Cgroup, *cgroup.Controllers, error) {
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prefix := c.CgroupPrefix
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t := cgroup.DetectedCgroupType
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ct, err := cgroup.GetAvailableController()
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if err != nil {
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c.Error("Failed to get available controllers", err)
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return nil, nil, err
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}
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if t == cgroup.TypeV2 {
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// Check if running on a systemd enabled system
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c.Info("Running with cgroup v2, connecting systemd dbus to create cgroup")
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var conn *dbus.Conn
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if os.Getuid() == 0 {
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conn, err = dbus.NewSystemConnectionContext(context.TODO())
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} else {
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conn, err = dbus.NewUserConnectionContext(context.TODO())
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}
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if err != nil {
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c.Info("Connecting to systemd dbus failed:", err)
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c.Info("Assuming running in container, enable cgroup v2 nesting support and take control of the whole cgroupfs")
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prefix = ""
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} else {
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defer conn.Close()
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scopeName := c.CgroupPrefix + ".scope"
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c.Info("Connected to systemd bus, attempting to create transient unit: ", scopeName)
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properties := []dbus.Property{
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dbus.PropDescription("go judge - a high performance sandbox service base on container technologies"),
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dbus.PropWants(scopeName),
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dbus.PropPids(uint32(os.Getpid())),
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newSystemdProperty("Delegate", true),
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}
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ch := make(chan string, 1)
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if _, err := conn.StartTransientUnitContext(context.TODO(), scopeName, "replace", properties, ch); err != nil {
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return nil, nil, fmt.Errorf("failed to start transient unit: %w", err)
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}
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s := <-ch
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if s != "done" {
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return nil, nil, fmt.Errorf("starting transient unit returns error: %w", err)
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}
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scopeName, err := cgroup.GetCurrentCgroupPrefix()
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if err != nil {
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return nil, nil, err
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}
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c.Info("Current cgroup is ", scopeName)
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prefix = scopeName
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ct, err = cgroup.GetAvailableControllerWithPrefix(prefix)
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if err != nil {
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return nil, nil, err
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}
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}
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}
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cgb, err := cgroup.New(prefix, ct)
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if err != nil {
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if os.Getuid() == 0 {
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c.Error("Failed to create cgroup ", prefix, " ", err)
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return nil, nil, err
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}
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c.Warn("Not running in root and have no permission on cgroup, falling back to rlimit / rusage mode")
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return nil, nil, nil
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}
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// Create api and migrate current process into it
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c.Info("Creating nesting api cgroup ", cgb)
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if _, err = cgb.Nest("api"); err != nil {
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// Only allow to fall back to rlimit mode when not running with root
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if os.Getuid() != 0 {
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c.Warn("Creating api cgroup with error: ", err)
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c.Warn("As running in non-root mode, falling back back to rlimit / rusage mode")
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cgb.Destroy()
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return nil, nil, nil
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}
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}
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c.Info("Creating containers cgroup")
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cg, err := cgb.New("containers")
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if err != nil {
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c.Warn("Creating containers cgroup with error: ", err)
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c.Warn("Falling back to rlimit / rusage mode")
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cgb = nil
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}
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if !ct.Memory {
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c.Warn("Memory cgroup is not enabled, failling back to rlimit / rusage mode")
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}
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if !ct.Pids {
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c.Warn("Pid cgroup is not enabled, proc limit does not have effect")
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}
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return cg, ct, nil
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}
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func newSystemdProperty(name string, units any) dbus.Property {
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return dbus.Property{
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Name: name,
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Value: ddbus.MakeVariant(units),
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}
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}
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type credGen struct {
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cur atomic.Uint32
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}
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func newCredGen(start uint32) *credGen {
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rt := &credGen{}
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rt.cur.Store(start)
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return rt
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}
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func (c *credGen) Get() syscall.Credential {
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n := c.cur.Add(1)
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return syscall.Credential{
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Uid: n,
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Gid: n,
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}
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}
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func kernelVersion() (major int, minor int) {
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var uname syscall.Utsname
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if err := syscall.Uname(&uname); err != nil {
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return
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}
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rl := uname.Release
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var values [2]int
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vi := 0
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value := 0
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for _, c := range rl {
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if '0' <= c && c <= '9' {
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value = (value * 10) + int(c-'0')
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} else {
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// Note that we're assuming N.N.N here. If we see anything else we are likely to
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// mis-parse it.
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values[vi] = value
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vi++
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if vi >= len(values) {
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break
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}
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value = 0
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}
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}
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switch vi {
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case 0:
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return 0, 0
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case 1:
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return values[0], 0
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case 2:
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return values[0], values[1]
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}
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return
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}
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