1
0
Fork 0
mirror of https://github.com/moby/moby.git synced 2022-11-09 12:21:53 -05:00
moby--moby/profiles/seccomp/seccomp.go
Michael Crosby 005506d36c Update moby to runc and oci 1.0 runtime final rc
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
2017-05-05 13:45:45 -07:00

150 lines
4.1 KiB
Go

// +build linux
package seccomp
import (
"encoding/json"
"errors"
"fmt"
"github.com/docker/docker/api/types"
"github.com/docker/docker/pkg/stringutils"
"github.com/opencontainers/runtime-spec/specs-go"
libseccomp "github.com/seccomp/libseccomp-golang"
)
//go:generate go run -tags 'seccomp' generate.go
// GetDefaultProfile returns the default seccomp profile.
func GetDefaultProfile(rs *specs.Spec) (*specs.LinuxSeccomp, error) {
return setupSeccomp(DefaultProfile(), rs)
}
// LoadProfile takes a json string and decodes the seccomp profile.
func LoadProfile(body string, rs *specs.Spec) (*specs.LinuxSeccomp, error) {
var config types.Seccomp
if err := json.Unmarshal([]byte(body), &config); err != nil {
return nil, fmt.Errorf("Decoding seccomp profile failed: %v", err)
}
return setupSeccomp(&config, rs)
}
var nativeToSeccomp = map[string]types.Arch{
"amd64": types.ArchX86_64,
"arm64": types.ArchAARCH64,
"mips64": types.ArchMIPS64,
"mips64n32": types.ArchMIPS64N32,
"mipsel64": types.ArchMIPSEL64,
"mipsel64n32": types.ArchMIPSEL64N32,
"s390x": types.ArchS390X,
}
func setupSeccomp(config *types.Seccomp, rs *specs.Spec) (*specs.LinuxSeccomp, 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 := &specs.LinuxSeccomp{}
var arch string
var native, err = libseccomp.GetNativeArch()
if err == nil {
arch = native.String()
}
if len(config.Architectures) != 0 && len(config.ArchMap) != 0 {
return nil, errors.New("'architectures' and 'archMap' were specified in the seccomp profile, use either 'architectures' or 'archMap'")
}
// if config.Architectures == 0 then libseccomp will figure out the architecture to use
if len(config.Architectures) != 0 {
for _, a := range config.Architectures {
newConfig.Architectures = append(newConfig.Architectures, specs.Arch(a))
}
}
if len(config.ArchMap) != 0 {
for _, a := range config.ArchMap {
seccompArch, ok := nativeToSeccomp[arch]
if ok {
if a.Arch == seccompArch {
newConfig.Architectures = append(newConfig.Architectures, specs.Arch(a.Arch))
for _, sa := range a.SubArches {
newConfig.Architectures = append(newConfig.Architectures, specs.Arch(sa))
}
break
}
}
}
}
newConfig.DefaultAction = specs.LinuxSeccompAction(config.DefaultAction)
Loop:
// Loop through all syscall blocks and convert them to libcontainer format after filtering them
for _, call := range config.Syscalls {
if len(call.Excludes.Arches) > 0 {
if stringutils.InSlice(call.Excludes.Arches, arch) {
continue Loop
}
}
if len(call.Excludes.Caps) > 0 {
for _, c := range call.Excludes.Caps {
if stringutils.InSlice(rs.Process.Capabilities.Effective, c) {
continue Loop
}
}
}
if len(call.Includes.Arches) > 0 {
if !stringutils.InSlice(call.Includes.Arches, arch) {
continue Loop
}
}
if len(call.Includes.Caps) > 0 {
for _, c := range call.Includes.Caps {
if !stringutils.InSlice(rs.Process.Capabilities.Effective, c) {
continue Loop
}
}
}
if call.Name != "" && len(call.Names) != 0 {
return nil, errors.New("'name' and 'names' were specified in the seccomp profile, use either 'name' or 'names'")
}
if call.Name != "" {
newConfig.Syscalls = append(newConfig.Syscalls, createSpecsSyscall(call.Name, call.Action, call.Args))
}
for _, n := range call.Names {
newConfig.Syscalls = append(newConfig.Syscalls, createSpecsSyscall(n, call.Action, call.Args))
}
}
return newConfig, nil
}
func createSpecsSyscall(name string, action types.Action, args []*types.Arg) specs.LinuxSyscall {
newCall := specs.LinuxSyscall{
Names: []string{name},
Action: specs.LinuxSeccompAction(action),
}
// Loop through all the arguments of the syscall and convert them
for _, arg := range args {
newArg := specs.LinuxSeccompArg{
Index: arg.Index,
Value: arg.Value,
ValueTwo: arg.ValueTwo,
Op: specs.LinuxSeccompOperator(arg.Op),
}
newCall.Args = append(newCall.Args, newArg)
}
return newCall
}