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moby--moby/profiles/seccomp/seccomp.go

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// +build linux
package seccomp
import (
"encoding/json"
"fmt"
"github.com/docker/engine-api/types"
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/seccomp"
)
//go:generate go run -tags 'seccomp' generate.go
// GetDefaultProfile returns the default seccomp profile.
func GetDefaultProfile() (*configs.Seccomp, error) {
return setupSeccomp(DefaultProfile)
}
// LoadProfile takes a file path a decodes the seccomp profile.
func LoadProfile(body string) (*configs.Seccomp, 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)
}
func setupSeccomp(config *types.Seccomp) (newConfig *configs.Seccomp, err 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{}
// if config.Architectures == 0 then libseccomp will figure out the architecture to use
if len(config.Architectures) > 0 {
newConfig.Architectures = []string{}
for _, arch := range config.Architectures {
newArch, err := seccomp.ConvertStringToArch(string(arch))
if err != nil {
return nil, err
}
newConfig.Architectures = append(newConfig.Architectures, newArch)
}
}
// Convert default action from string representation
newConfig.DefaultAction, err = seccomp.ConvertStringToAction(string(config.DefaultAction))
if err != nil {
return nil, err
}
// 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
}