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// NOTE: this package has originally been copied from
// github.com/opencontainers/runc and modified to work for other use cases
package seccomp
import (
"fmt"
"github.com/opencontainers/runtime-spec/specs-go"
)
var (
goArchToSeccompArchMap = map[string]Arch{
"386": ArchX86,
"amd64": ArchX86_64,
"amd64p32": ArchX32,
"arm": ArchARM,
"arm64": ArchAARCH64,
"mips": ArchMIPS,
"mips64": ArchMIPS64,
"mips64le": ArchMIPSEL64,
"mips64p32": ArchMIPS64N32,
"mips64p32le": ArchMIPSEL64N32,
"mipsle": ArchMIPSEL,
"ppc": ArchPPC,
"ppc64": ArchPPC64,
"ppc64le": ArchPPC64LE,
"s390": ArchS390,
"s390x": ArchS390X,
}
specArchToLibseccompArchMap = map[specs.Arch]string{
specs.ArchX86: "x86",
specs.ArchX86_64: "amd64",
specs.ArchX32: "x32",
specs.ArchARM: "arm",
specs.ArchAARCH64: "arm64",
specs.ArchMIPS: "mips",
specs.ArchMIPS64: "mips64",
specs.ArchMIPS64N32: "mips64n32",
specs.ArchMIPSEL: "mipsel",
specs.ArchMIPSEL64: "mipsel64",
specs.ArchMIPSEL64N32: "mipsel64n32",
specs.ArchPPC: "ppc",
specs.ArchPPC64: "ppc64",
specs.ArchPPC64LE: "ppc64le",
specs.ArchS390: "s390",
specs.ArchS390X: "s390x",
}
specArchToSeccompArchMap = map[specs.Arch]Arch{
specs.ArchX86: ArchX86,
specs.ArchX86_64: ArchX86_64,
specs.ArchX32: ArchX32,
specs.ArchARM: ArchARM,
specs.ArchAARCH64: ArchAARCH64,
specs.ArchMIPS: ArchMIPS,
specs.ArchMIPS64: ArchMIPS64,
specs.ArchMIPS64N32: ArchMIPS64N32,
specs.ArchMIPSEL: ArchMIPSEL,
specs.ArchMIPSEL64: ArchMIPSEL64,
specs.ArchMIPSEL64N32: ArchMIPSEL64N32,
specs.ArchPPC: ArchPPC,
specs.ArchPPC64: ArchPPC64,
specs.ArchPPC64LE: ArchPPC64LE,
specs.ArchS390: ArchS390,
specs.ArchS390X: ArchS390X,
}
specActionToSeccompActionMap = map[specs.LinuxSeccompAction]Action{
specs.ActKill: ActKill,
// TODO: wait for this PR to get merged:
// https://github.com/opencontainers/runtime-spec/pull/1064
// specs.ActKillProcess ActKillProcess,
// specs.ActKillThread ActKillThread,
specs.ActErrno: ActErrno,
specs.ActTrap: ActTrap,
specs.ActAllow: ActAllow,
specs.ActTrace: ActTrace,
specs.ActLog: ActLog,
specs.ActNotify: ActNotify,
}
specOperatorToSeccompOperatorMap = map[specs.LinuxSeccompOperator]Operator{
specs.OpNotEqual: OpNotEqual,
specs.OpLessThan: OpLessThan,
specs.OpLessEqual: OpLessEqual,
specs.OpEqualTo: OpEqualTo,
specs.OpGreaterEqual: OpGreaterEqual,
specs.OpGreaterThan: OpGreaterThan,
specs.OpMaskedEqual: OpMaskedEqual,
}
)
// GoArchToSeccompArch converts a runtime.GOARCH to a seccomp `Arch`. The
// function returns an error if the architecture conversion is not supported.
func GoArchToSeccompArch(goArch string) (Arch, error) {
arch, ok := goArchToSeccompArchMap[goArch]
if !ok {
return "", fmt.Errorf("unsupported go arch provided: %s", goArch)
}
return arch, nil
}
// specToSeccomp converts a `LinuxSeccomp` spec into a `Seccomp` struct.
func specToSeccomp(spec *specs.LinuxSeccomp) (*Seccomp, error) {
res := &Seccomp{
Syscalls: []*Syscall{},
}
for _, arch := range spec.Architectures {
newArch, err := specArchToSeccompArch(arch)
if err != nil {
return nil, fmt.Errorf("convert spec arch: %w", err)
}
res.Architectures = append(res.Architectures, newArch)
}
// Convert default action
newDefaultAction, err := specActionToSeccompAction(spec.DefaultAction)
if err != nil {
return nil, fmt.Errorf("convert default action: %w", err)
}
res.DefaultAction = newDefaultAction
res.DefaultErrnoRet = spec.DefaultErrnoRet
// Loop through all syscall blocks and convert them to the internal format
for _, call := range spec.Syscalls {
newAction, err := specActionToSeccompAction(call.Action)
if err != nil {
return nil, fmt.Errorf("convert action: %w", err)
}
for _, name := range call.Names {
newCall := Syscall{
Name: name,
Action: newAction,
ErrnoRet: call.ErrnoRet,
Args: []*Arg{},
}
// Loop through all the arguments of the syscall and convert them
for _, arg := range call.Args {
newOp, err := specOperatorToSeccompOperator(arg.Op)
if err != nil {
return nil, fmt.Errorf("convert operator: %w", err)
}
newArg := Arg{
Index: arg.Index,
Value: arg.Value,
ValueTwo: arg.ValueTwo,
Op: newOp,
}
newCall.Args = append(newCall.Args, &newArg)
}
res.Syscalls = append(res.Syscalls, &newCall)
}
}
return res, nil
}
// specArchToLibseccompArch converts a spec arch into a libseccomp one.
func specArchToLibseccompArch(arch specs.Arch) (string, error) {
if res, ok := specArchToLibseccompArchMap[arch]; ok {
return res, nil
}
return "", fmt.Errorf(
"architecture %q is not valid for libseccomp", arch,
)
}
// specArchToSeccompArch converts a spec arch into an internal one.
func specArchToSeccompArch(arch specs.Arch) (Arch, error) {
if res, ok := specArchToSeccompArchMap[arch]; ok {
return res, nil
}
return "", fmt.Errorf("architecture %q is not valid", arch)
}
// specActionToSeccompAction converts a spec action into a seccomp one.
func specActionToSeccompAction(action specs.LinuxSeccompAction) (Action, error) {
if res, ok := specActionToSeccompActionMap[action]; ok {
return res, nil
}
return "", fmt.Errorf(
"spec action %q is not valid internal action", action,
)
}
// specOperatorToSeccompOperator converts a spec operator into a seccomp one.
func specOperatorToSeccompOperator(operator specs.LinuxSeccompOperator) (Operator, error) {
if op, ok := specOperatorToSeccompOperatorMap[operator]; ok {
return op, nil
}
return "", fmt.Errorf(
"spec operator %q is not a valid internal operator", operator,
)
}
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