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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/specs/specs-go"
)
//go:generate go run -tags 'seccomp' generate.go
// GetDefaultProfile returns the default seccomp profile.
func GetDefaultProfile() (*specs.Seccomp, error) {
return setupSeccomp(DefaultProfile)
}
// LoadProfile takes a file path and decodes the seccomp profile.
func LoadProfile(body string) (*specs.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 *specs.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 = &specs.Seccomp{}
// if config.Architectures == 0 then libseccomp will figure out the architecture to use
if len(config.Architectures) > 0 {
for _, arch := range config.Architectures {
newConfig.Architectures = append(newConfig.Architectures, specs.Arch(arch))
}
}
newConfig.DefaultAction = specs.Action(config.DefaultAction)
// Loop through all syscall blocks and convert them to libcontainer format
for _, call := range config.Syscalls {
newCall := specs.Syscall{
Name: call.Name,
Action: specs.Action(call.Action),
}
// Loop through all the arguments of the syscall and convert them
for _, arg := range call.Args {
newArg := specs.Arg{
Index: arg.Index,
Value: arg.Value,
ValueTwo: arg.ValueTwo,
Op: specs.Operator(arg.Op),
}
newCall.Args = append(newCall.Args, newArg)
}
newConfig.Syscalls = append(newConfig.Syscalls, newCall)
}
return newConfig, nil
}